From a6000f18fdcca4e6a54dfa0b7bb62269ed3d28a6 Mon Sep 17 00:00:00 2001
From: Alexander Alber <90604107+alexanderalber@users.noreply.github.com>
Date: Sat, 10 Oct 2026 12:51:31 +0200
Subject: [PATCH 001/376] Morph: align an outline morph once per transition,
 not every frame

Follow-up to #27. render_blend built a GeometryMorph (contours, alignment)
for every morphing shape on every frame, though only t and the current box
change while a transition plays. The Renderer now keeps the aligned morphs,
keyed by both geometries and their own sizes, and drops those a frame did
not use, so the cache ends with the transition.

- render: morph_path::Cache replaces morph_path::geometry; blend sweeps it.
- test: one alignment per transition, same geometry as a fresh one.

generated with Claude Code
---
 crates/render/src/lib.rs        |  7 +++-
 crates/render/src/morph_path.rs | 73 +++++++++++++++++++++++++++++----
 crates/render/src/tests.rs      | 23 +++++++++++
 3 files changed, 93 insertions(+), 10 deletions(-)

diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index 6dde577a..61a35e93 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -221,11 +221,13 @@ pub struct Renderer {
     resources: Resources,
     /// Outlines morphing in the frame being drawn by `blend`.
     paths: Vec<PathMorph>,
+    /// Their aligned outlines, kept from frame to frame.
+    morphs: morph_path::Cache,
 }
 
 impl Default for Renderer {
     fn default() -> Self {
-        Renderer { resources: Resources::new(), paths: Vec::new() }
+        Renderer { resources: Resources::new(), paths: Vec::new(), morphs: morph_path::Cache::default() }
     }
 }
 
@@ -539,6 +541,7 @@ impl Renderer {
             }
         }
         self.paths.clear();
+        self.morphs.sweep();
         self.finish(ctx, w, h)
     }
 
@@ -654,7 +657,7 @@ impl Renderer {
 
     fn geometry_shape(&mut self, ctx: &mut RenderContext, f: &Frame, rctx: &Ctx, s: &Shape, m: Affine, w: f64, h: f64, st: &ShapeState) {
         let (geo, fades) = match self.paths.iter().find(|p| p.id == s.id) {
-            Some(pm) => morph_path::geometry(pm, s, w, h),
+            Some(pm) => self.morphs.geometry(pm, s, w, h),
             None => (shape_geometry(s, w, h), Vec::new()),
         };
         let fade = |i: usize| fades.get(i).copied().unwrap_or(deckcraft_geom::morph::Fade { fill: 1.0, stroke: 1.0 });
diff --git a/crates/render/src/morph_path.rs b/crates/render/src/morph_path.rs
index 6579eb18..33af94ed 100644
--- a/crates/render/src/morph_path.rs
+++ b/crates/render/src/morph_path.rs
@@ -29,12 +29,69 @@ fn ratio(now: f64, own: f64) -> f64 {
     if own.abs() > 1e-9 && r.is_finite() { r } else { 1.0 }
 }
 
-/// The geometry of frame shape `s` at its current size `w` x `h`: both outlines are built at their
-/// own sizes (so the alignment does not change while the box grows), then scaled into the box.
-/// With a [`Fade`] per sub-path.
-pub(crate) fn geometry(pm: &PathMorph, s: &Shape, w: f64, h: f64) -> (Geometry, Vec<Fade>) {
-    let a = shape_geometry(&Shape { geom: pm.from.clone(), ..Shape::default() }, pm.from_box.w, pm.from_box.h);
-    let b = shape_geometry(s, pm.to_box.w, pm.to_box.h);
-    let scale = |x: Xfrm| Vec2::new(ratio(w, x.w), ratio(h, x.h));
-    GeometryMorph::new(&a, &b).at(pm.t, scale(pm.from_box), scale(pm.to_box))
+/// What a [`GeometryMorph`] is built from: both outlines at their own sizes. None of it changes
+/// while a transition plays, only `t` and the current box do.
+#[derive(Debug)]
+struct Source {
+    from: Geom,
+    from_wh: (f64, f64),
+    to: Geom,
+    to_wh: (f64, f64),
+}
+
+impl Source {
+    fn of(pm: &PathMorph, s: &Shape) -> Self {
+        Source { from: pm.from.clone(), from_wh: (pm.from_box.w, pm.from_box.h), to: s.geom.clone(), to_wh: (pm.to_box.w, pm.to_box.h) }
+    }
+
+    fn is(&self, pm: &PathMorph, s: &Shape) -> bool {
+        self.from == pm.from && self.from_wh == (pm.from_box.w, pm.from_box.h) && self.to == s.geom && self.to_wh == (pm.to_box.w, pm.to_box.h)
+    }
+
+    fn build(&self) -> GeometryMorph {
+        let geo = |geom: &Geom, (w, h): (f64, f64)| shape_geometry(&Shape { geom: geom.clone(), ..Shape::default() }, w, h);
+        GeometryMorph::new(&geo(&self.from, self.from_wh), &geo(&self.to, self.to_wh))
+    }
+}
+
+/// The aligned outlines of the morphs being played, kept across frames: aligning is the expensive
+/// part, blending them at `t` is cheap.
+#[derive(Debug, Default)]
+pub(crate) struct Cache {
+    /// With whether the current frame used it.
+    morphs: Vec<(Source, GeometryMorph, bool)>,
+}
+
+impl Cache {
+    /// The geometry of frame shape `s` at its current size `w` x `h`: both outlines are built at
+    /// their own sizes (so the alignment does not change while the box grows), then scaled into the
+    /// box. With a [`Fade`] per sub-path.
+    pub(crate) fn geometry(&mut self, pm: &PathMorph, s: &Shape, w: f64, h: f64) -> (Geometry, Vec<Fade>) {
+        let k = match self.morphs.iter().position(|(src, ..)| src.is(pm, s)) {
+            Some(k) => k,
+            None => {
+                let src = Source::of(pm, s);
+                let m = src.build();
+                self.morphs.push((src, m, false));
+                self.morphs.len() - 1
+            }
+        };
+        let (_, m, used) = &mut self.morphs[k];
+        *used = true;
+        let scale = |x: Xfrm| Vec2::new(ratio(w, x.w), ratio(h, x.h));
+        m.at(pm.t, scale(pm.from_box), scale(pm.to_box))
+    }
+
+    /// Ends a frame: forgets the morphs it did not use (their transition is over).
+    pub(crate) fn sweep(&mut self) {
+        self.morphs.retain(|(.., used)| *used);
+        for (.., used) in &mut self.morphs {
+            *used = false;
+        }
+    }
+
+    #[cfg(test)]
+    pub(crate) fn len(&self) -> usize {
+        self.morphs.len()
+    }
 }
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index ccb4472f..464ad0dd 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -417,6 +417,29 @@ fn morph_path_fades_a_fill_only_one_side_has() {
     assert!(half[0] > full[0] + 40 && half[0] < 215, "{half:?} vs {full:?}");
 }
 
+#[test]
+fn morph_path_aligns_once_per_transition() {
+    let (from, to) = (Xfrm::new(0.0, 0.0, 200.0, 200.0), Xfrm::new(0.0, 0.0, 300.0, 150.0));
+    let star = Shape { geom: Geom::preset("star5"), ..Default::default() };
+    let pm = |t: f64| PathMorph { id: ShapeId(10), from: Geom::preset("ellipse"), from_box: from, to_box: to, t };
+    let els = |(g, f): (deckcraft_geom::preset::Geometry, Vec<_>)| (g.paths.iter().map(|p| p.path.elements().to_vec()).collect::<Vec<_>>(), f);
+    let mut cache = morph_path::Cache::default();
+    for t in [0.0, 0.3, 0.7, 1.0] {
+        let got = els(cache.geometry(&pm(t), &star, 250.0, 175.0));
+        // The same as aligning afresh.
+        assert_eq!(got, els(morph_path::Cache::default().geometry(&pm(t), &star, 250.0, 175.0)));
+        cache.sweep();
+    }
+    assert_eq!(cache.len(), 1);
+    // Another target outline is another morph.
+    let _ = cache.geometry(&pm(0.5), &Shape { geom: Geom::preset("rect"), ..Default::default() }, 250.0, 175.0);
+    assert_eq!(cache.len(), 2);
+    // A frame without morphs ends the transition: the cache empties.
+    cache.sweep();
+    cache.sweep();
+    assert_eq!(cache.len(), 0);
+}
+
 #[test]
 fn text_transform_unmirrors_flips() {
     // Asymmetric text rect in a 100×50 box: flips move the rect, never mirror the text.

From 074e090f050ed98c63e7fd36dcaa889ea4f66865 Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@stackworx.io>
Date: Sat, 10 Oct 2026 17:50:21 +0200
Subject: [PATCH 002/376] Fonts: a lookup finds an installed family whichever
 thread loads it first

Two threads resolving a family nobody had loaded yet raced. The one that
lost the race saw add_font add nothing and fell back to another face, and
a lookup made while a family was being added saw only part of it (Arial
Bold Italic loads first, so "Regular" came back bold italic). The same
text was then laid out in different fonts depending on timing, which made
clicks_in_flipped_shapes_hit_the_text_where_it_is_drawn flaky when the
theme font isn't bundled.

Loading installed fonts now happens under one lock and rechecks once it
holds it, and a family's faces are added in one step.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/fonts/src/fontdb.rs | 75 ++++++++++++++++++++++++++++++--------
 crates/fonts/src/lib.rs    | 28 ++++++++++++++
 2 files changed, 87 insertions(+), 16 deletions(-)

diff --git a/crates/fonts/src/fontdb.rs b/crates/fonts/src/fontdb.rs
index f0a06efe..426b95c9 100644
--- a/crates/fonts/src/fontdb.rs
+++ b/crates/fonts/src/fontdb.rs
@@ -245,6 +245,11 @@ pub struct FontDb {
     /// System fallback state: enabled, and characters no system font covers.
     #[cfg(not(target_arch = "wasm32"))]
     sys: Mutex<SysFallback>,
+    /// Held while installed fonts are loaded, so threads that need the same family wait for one
+    /// load instead of racing it: what a lookup finds doesn't depend on which thread got there
+    /// first.
+    #[cfg(not(target_arch = "wasm32"))]
+    loading: Mutex<()>,
 }
 
 #[cfg(not(target_arch = "wasm32"))]
@@ -535,6 +540,8 @@ impl FontDb {
             cataloged: std::sync::OnceLock::new(),
             #[cfg(not(target_arch = "wasm32"))]
             sys: Mutex::new(SysFallback { enabled: true, ..Default::default() }),
+            #[cfg(not(target_arch = "wasm32"))]
+            loading: Mutex::new(()),
         }
     }
 
@@ -600,14 +607,33 @@ impl FontDb {
     /// Add a user font (TTF/OTF/TTC bytes). Returns the number of faces added (0 if unparseable or
     /// every face was already present).
     pub fn add_font(&self, bytes: Vec<u8>) -> usize {
-        let data = Arc::new(bytes);
-        let mut added = 0;
-        for (i, family, style, coords) in enumerate_faces(&data) {
-            if self.read_faces().iter().any(|f| f.family.eq_ignore_ascii_case(&family) && f.style.eq_ignore_ascii_case(&style)) {
-                continue;
+        self.add_fonts(vec![bytes])
+    }
+
+    /// Add font files together: lookups see all of their faces or none, never part of a family.
+    /// Returns the number of faces added.
+    fn add_fonts(&self, files: Vec<Vec<u8>>) -> usize {
+        let present = |faces: &[Arc<FontFace>], family: &str, style: &str| {
+            faces.iter().any(|f| f.family.eq_ignore_ascii_case(family) && f.style.eq_ignore_ascii_case(style))
+        };
+        let mut new = Vec::new();
+        for bytes in files {
+            let data = Arc::new(bytes);
+            for (i, family, style, coords) in enumerate_faces(&data) {
+                if present(&self.read_faces(), &family, &style) {
+                    continue;
+                }
+                if let Some(f) = make_face(FontBytes::Owned(data.clone()), i, family, style, coords) {
+                    new.push(Arc::new(f));
+                }
             }
-            if let Some(f) = make_face(FontBytes::Owned(data.clone()), i, family, style, coords) {
-                self.faces.write().unwrap_or_else(|e| e.into_inner()).push(Arc::new(f));
+        }
+        let mut faces = self.faces.write().unwrap_or_else(|e| e.into_inner());
+        let mut added = 0;
+        for f in new {
+            // Checked again under the lock: another thread may have added the same face.
+            if !present(&faces, &f.family, &f.style) {
+                faces.push(f);
                 added += 1;
             }
         }
@@ -677,9 +703,21 @@ impl FontDb {
         n
     }
 
-    /// Load the files of the installed `family`. Returns whether any face was added.
+    /// Load the files of the installed `family` unless it is loaded. Returns whether it is loaded
+    /// (by this call or any other).
     #[cfg(not(target_arch = "wasm32"))]
     fn load_cataloged(&self, family: &str) -> bool {
+        let loading = self.loading.lock().unwrap_or_else(|e| e.into_inner());
+        self.load_family(family, &loading)
+    }
+
+    /// [`FontDb::load_cataloged`] for a caller already holding `loading`.
+    #[cfg(not(target_arch = "wasm32"))]
+    fn load_family(&self, family: &str, _loading: &std::sync::MutexGuard<'_, ()>) -> bool {
+        // Another thread may have loaded it while this one waited for the lock.
+        if self.is_loaded(family) {
+            return true;
+        }
         let paths: Vec<std::path::PathBuf> = {
             let cat = self.read_catalog();
             let mut p: Vec<_> = cat.iter().filter(|c| c.family.eq_ignore_ascii_case(family)).map(|c| c.path.clone()).collect();
@@ -687,13 +725,8 @@ impl FontDb {
             p.dedup();
             p
         };
-        let mut any = false;
-        for p in paths {
-            if let Ok(data) = std::fs::read(&p) {
-                any |= self.add_font(data) > 0;
-            }
-        }
-        any
+        self.add_fonts(paths.iter().filter_map(|p| std::fs::read(p).ok()).collect());
+        self.is_loaded(family)
     }
 
     /// Resolve a family + style to a face, falling back to the closest style of the family, then to
@@ -846,6 +879,7 @@ impl FontDb {
         if c.is_control() || c.is_whitespace() {
             return false;
         }
+        let seen = self.read_faces().len();
         {
             let sys = self.sys.lock().unwrap_or_else(|e| e.into_inner());
             if !sys.enabled || sys.misses.contains(&c) {
@@ -854,9 +888,18 @@ impl FontDb {
         }
         let covered = |db: &FontDb| db.read_faces().iter().any(|f| f.covers(c));
         let cataloged: Vec<String> = self.read_catalog().iter().map(|e| e.family.clone()).collect();
+        let loading = self.loading.lock().unwrap_or_else(|e| e.into_inner());
+        // Another thread may have loaded a face for `c` (faces are only ever added), or found
+        // there is none, while this one waited.
+        if self.read_faces().len() != seen && covered(self) {
+            return true;
+        }
+        if self.sys.lock().unwrap_or_else(|e| e.into_inner()).misses.contains(&c) {
+            return false;
+        }
         for fam in SYSTEM_FALLBACKS {
             if !self.is_loaded(fam) && cataloged.iter().any(|f| f.eq_ignore_ascii_case(fam)) {
-                self.load_cataloged(fam);
+                self.load_family(fam, &loading);
                 if covered(self) {
                     return true;
                 }
diff --git a/crates/fonts/src/lib.rs b/crates/fonts/src/lib.rs
index 94e8081f..2587e7b0 100644
--- a/crates/fonts/src/lib.rs
+++ b/crates/fonts/src/lib.rs
@@ -152,6 +152,34 @@ mod tests {
         assert!(!shape(&f, "Hello", &[], |c| c).is_empty());
     }
 
+    #[test]
+    fn concurrent_lookups_all_find_an_installed_family() {
+        // Threads resolving an installed family nobody had loaded yet used to fall back to
+        // another face when a different thread finished loading it first, so the same text was
+        // laid out in different fonts depending on timing.
+        let dir = std::env::temp_dir().join(format!("deckcraft-fonts-concurrent-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        std::fs::write(dir.join("Hack-Regular.ttf"), epaint_default_fonts::HACK_REGULAR).unwrap();
+        for _ in 0..20 {
+            let db = FontDb::with_font_dirs(vec![dir.clone()]);
+            db.set_system_fallback(false);
+            let start = std::sync::Barrier::new(8);
+            let got: Vec<String> = std::thread::scope(|s| {
+                let threads: Vec<_> = (0..8)
+                    .map(|_| {
+                        s.spawn(|| {
+                            start.wait();
+                            db.face("Hack", "Regular").family.clone()
+                        })
+                    })
+                    .collect();
+                threads.into_iter().map(|t| t.join().unwrap()).collect()
+            });
+            assert!(got.iter().all(|f| f == "Hack"), "{got:?}");
+        }
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+
     #[test]
     fn office_fonts_have_substitutes() {
         assert!(substitutes("Calibri").contains(&"Carlito"));

From 6be9817693a5f8832a8bc3c0e4ceeac28000d3c6 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sat, 10 Oct 2026 18:59:34 +0200
Subject: [PATCH 003/376] Export: PNG images (all slides) in the browser
 downloads every slide (#64)

---
 crates/ui-egui/src/dialogs.rs | 55 +++++++++++++++++++++++++++--------
 1 file changed, 43 insertions(+), 12 deletions(-)

diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 73ce180b..0cd0bcc0 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -455,19 +455,17 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                         }
                     }
                 } else if let (Some(dl), Some(s)) = (app.services.download.as_mut(), app.session.active()) {
-                    let bytes = match ext {
-                        "png" | "jpg" => {
-                            let img = deckcraft_render::render_slide(
-                                &s.doc,
-                                s.selection.slide,
-                                &deckcraft_render::RenderOpts { scale: 2.0, ..Default::default() },
-                            );
-                            if ext == "png" { img.to_png() } else { img.to_jpeg(92) }
+                    if matches!(ext, "png" | "jpg") {
+                        for (file, bytes) in web_image_files(&s.doc, s.selection.slide, all, &name, ext) {
+                            dl(&file, &bytes);
                         }
-                        "pdf" => deckcraft_pdf_bytes(&s.doc, &pdf_params),
-                        other => deckcraft_engine::cmd::file::save_bytes(&s.doc, other).unwrap_or_default(),
-                    };
-                    dl(&suggested, &bytes);
+                    } else {
+                        let bytes = match ext {
+                            "pdf" => deckcraft_pdf_bytes(&s.doc, &pdf_params),
+                            other => deckcraft_engine::cmd::file::save_bytes(&s.doc, other).unwrap_or_default(),
+                        };
+                        dl(&suggested, &bytes);
+                    }
                 }
             }
             ok || cancel
@@ -928,11 +926,44 @@ fn deckcraft_pdf_bytes(doc: &deckcraft_model::Presentation, params: &serde_json:
     deckcraft_engine::cmd::file::pdf_bytes(doc, params).unwrap_or_default()
 }
 
+/// Images for the browser download: the current slide, or every slide (named `<name>1.png`, `<name>2.png`... like the native export) when `all`.
+fn web_image_files(doc: &deckcraft_model::Presentation, current: usize, all: bool, name: &str, ext: &str) -> Vec<(String, Vec<u8>)> {
+    let slides: Vec<usize> = if all { (0..doc.slides.len()).collect() } else { vec![current] };
+    let single = slides.len() == 1;
+    slides
+        .into_iter()
+        .enumerate()
+        .map(|(k, i)| {
+            let img = deckcraft_render::render_slide(doc, i, &deckcraft_render::RenderOpts { scale: 2.0, ..Default::default() });
+            let bytes = if ext == "png" { img.to_png() } else { img.to_jpeg(92) };
+            let file = if single { format!("{name}.{ext}") } else { format!("{name}{}.{ext}", k + 1) };
+            (file, bytes)
+        })
+        .collect()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
     use std::cell::{Cell, RefCell};
 
+    /// The browser "PNG images (all slides)" export yields one image per slide, not just the selected one (#64).
+    #[test]
+    fn web_export_all_slides_gives_one_file_per_slide() {
+        let mut doc = deckcraft_model::Presentation::default();
+        if let Some(first) = doc.slides.first().cloned() {
+            doc.slides.push(first.clone());
+            doc.slides.push(first);
+        }
+        assert_eq!(doc.slides.len(), 3);
+        let all = web_image_files(&doc, 1, true, "Deck", "png");
+        let names: Vec<&str> = all.iter().map(|(n, _)| n.as_str()).collect();
+        assert_eq!(names, ["Deck1.png", "Deck2.png", "Deck3.png"]);
+        let one = web_image_files(&doc, 1, false, "Deck", "png");
+        assert_eq!(one.len(), 1);
+        assert_eq!(one[0].0, "Deck.png");
+    }
+
     /// Start screen theme tiles that wrap onto a second row keep the 40-point inset (#17).
     #[test]
     fn inset_wrapped_indents_every_row() {

From 6ff5b274ea251fb8d22c3b1f1b66e74f1c08b1e5 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sat, 10 Oct 2026 19:00:06 +0200
Subject: [PATCH 004/376] PPTX: animation rewind survives save and reopen (#77)

---
 crates/pptx/src/read/timing.rs  |  2 ++
 crates/pptx/src/write/timing.rs |  2 +-
 crates/pptx/tests/roundtrip.rs  | 17 +++++++++++++++++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/crates/pptx/src/read/timing.rs b/crates/pptx/src/read/timing.rs
index 500bb485..fcf01953 100644
--- a/crates/pptx/src/read/timing.rs
+++ b/crates/pptx/src/read/timing.rs
@@ -137,6 +137,8 @@ pub fn animations(imp: &mut Imp, part: &Part, ctx: &IdCtx, timing: &El, _shapes:
             preset_id: Some(preset),
             preset_subtype: Some(sub),
             auto_reverse: c.bool("autoRev").unwrap_or(false),
+            // PowerPoint's "Rewind when done playing" is `fill="remove"` on the effect node.
+            rewind: c.attr("fill") == Some("remove"),
             smooth_start: c.f64("accel").map(|v| v / 100_000.0).unwrap_or(0.0),
             smooth_end: c.f64("decel").map(|v| v / 100_000.0).unwrap_or(0.0),
             ..Default::default()
diff --git a/crates/pptx/src/write/timing.rs b/crates/pptx/src/write/timing.rs
index aa577ca7..09b101dc 100644
--- a/crates/pptx/src/write/timing.rs
+++ b/crates/pptx/src/write/timing.rs
@@ -445,7 +445,7 @@ fn effect_par(w: &mut W, x: &mut Exp, ids: &mut Ids, e: &Eff, first_in_click: bo
             .o("accel", accel)
             .o("decel", decel)
             .t("autoRev", a.auto_reverse)
-            .a("fill", "hold")
+            .a("fill", if a.rewind { "remove" } else { "hold" })
             .a("grpId", e.grp)
             .a("nodeType", node),
     );
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index 420a3921..a835ca69 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -633,6 +633,23 @@ fn every_animation_effect_survives() {
     }
 }
 
+#[test]
+fn animation_rewind_survives() {
+    let mut p = defaults::new_presentation(None);
+    let mut s = p.slides[0].as_ref().clone();
+    let sh = shape(&mut p, "Target", 100.0, 100.0, 100.0, 100.0);
+    let id = sh.id;
+    s.shapes.push(sh);
+    s.animations.push(Animation { shape: id, rewind: true, ..Default::default() });
+    s.animations.push(Animation { shape: id, effect: "fly".into(), option: "l".into(), start: AnimStart::WithPrevious, ..Default::default() });
+    p.slides[0] = Arc::new(s);
+    let q = round(&p);
+    let b = &q.slides[0].animations;
+    assert_eq!(b.len(), 2);
+    assert!(b[0].rewind);
+    assert!(!b[1].rewind);
+}
+
 /// Writes bisection variants of the rich deck to `DECKCRAFT_PPTX_BISECT` (manual checks).
 #[test]
 fn bisect_variants() {

From d2acdf07dba9c6a8e05681137945515fba441368 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sat, 10 Oct 2026 19:01:56 +0200
Subject: [PATCH 005/376] Comments: browser-created comments and replies get a
 creation timestamp (#72)

---
 Cargo.lock                      |  1 +
 crates/engine/Cargo.toml        |  4 ++++
 crates/engine/src/cmd/review.rs | 38 +++++++++++++++++++++++++++------
 3 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index e50d814e..f31cb6c8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -951,6 +951,7 @@ dependencies = [
  "deckcraft-text",
  "i_overlay",
  "image",
+ "js-sys",
  "log",
  "serde",
  "serde_json",
diff --git a/crates/engine/Cargo.toml b/crates/engine/Cargo.toml
index 1f4dbfcd..14071145 100644
--- a/crates/engine/Cargo.toml
+++ b/crates/engine/Cargo.toml
@@ -25,3 +25,7 @@ i_overlay = { workspace = true }
 thiserror = { workspace = true }
 log = { workspace = true }
 image = { workspace = true }
+
+# The browser clock for comment timestamps (wasm has no std::time::SystemTime).
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+js-sys = "0.3"
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 8e3a532c..856aa128 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -43,20 +43,29 @@ pub fn specs() -> Vec<CommandSpec> {
     ]
 }
 
-fn now() -> String {
+/// Seconds since the Unix epoch: the system clock, or the browser's on wasm (which has no `SystemTime`).
+fn now_secs() -> u64 {
     #[cfg(not(target_arch = "wasm32"))]
     {
-        let secs = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).map(|d| d.as_secs()).unwrap_or(0);
-        let (y, m, d) = super::design::civil((secs / 86_400) as i64);
-        let t = secs % 86_400;
-        format!("{y:04}-{m:02}-{d:02}T{:02}:{:02}:{:02}Z", t / 3600, t / 60 % 60, t % 60)
+        std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).map(|d| d.as_secs()).unwrap_or(0)
     }
     #[cfg(target_arch = "wasm32")]
     {
-        String::new()
+        (js_sys::Date::now() / 1000.0).max(0.0) as u64
     }
 }
 
+/// A UTC timestamp as saved on comments: `2026-10-10T13:10:35Z`.
+fn iso_utc(secs: u64) -> String {
+    let (y, m, d) = super::design::civil((secs / 86_400) as i64);
+    let t = secs % 86_400;
+    format!("{y:04}-{m:02}-{d:02}T{:02}:{:02}:{:02}Z", t / 3600, t / 60 % 60, t % 60)
+}
+
+fn now() -> String {
+    iso_utc(now_secs())
+}
+
 fn add(s: &mut Session, p: &Value) -> Result<Value> {
     let text = str_param(p, "text").ok_or_else(|| bad("comment.add", "missing `text`"))?.to_string();
     let author = s.prefs.author.clone();
@@ -264,3 +273,20 @@ fn custom_show(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     ok()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn timestamps_are_iso_utc() {
+        assert_eq!(iso_utc(0), "1970-01-01T00:00:00Z");
+        assert_eq!(iso_utc(1_791_637_835), "2026-10-10T13:10:35Z");
+    }
+
+    #[test]
+    fn the_clock_is_not_empty() {
+        // On wasm this used to return an empty string, so browser comments were saved undated.
+        assert!(now().starts_with("20"), "{}", now());
+    }
+}

From 7afa9ea1330760c0f7cc06610c7ba8dd77eb0a43 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sat, 10 Oct 2026 19:01:44 +0200
Subject: [PATCH 006/376] =?UTF-8?q?Command=20palette:=20one=20Export?=
 =?UTF-8?q?=E2=80=A6=20entry=20that=20opens=20the=20dialog,=20no=20path-on?=
 =?UTF-8?q?ly=20duplicate=20(#79)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 crates/ui-egui/src/menus.rs | 50 +++++++++++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 11 deletions(-)

diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 9349dc36..2a413e95 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -52,6 +52,22 @@ pub fn ui_shortcut(app: &mut SlideApp, key: egui::Key, m: Mods) -> bool {
     true
 }
 
+/// The palette's entries for the lowercase query `q`. An engine command is hidden when a UI command has the same label: Open…, Save As…,
+/// Export… and Audio/Video from File… need a `path` the palette can't give, so the one entry left opens the dialog instead of failing.
+fn palette_items(session: &deckcraft_engine::Session, q: &str) -> Vec<(String, String, Option<&'static str>)> {
+    let mut items: Vec<(String, String, Option<&'static str>)> = session
+        .commands()
+        .into_iter()
+        .filter(|c| c.enabled && !crate::UI_COMMANDS.iter().any(|u| u.1 == c.label))
+        .map(|c| (c.id.to_string(), c.label.to_string(), c.shortcut))
+        .chain(crate::UI_COMMANDS.iter().map(|c| (c.0.to_string(), c.1.to_string(), c.2)))
+        .filter(|(id, label, _)| q.is_empty() || label.to_lowercase().contains(q) || id.to_lowercase().contains(q))
+        .collect();
+    items.sort_by_key(|(_, l, _)| !l.to_lowercase().starts_with(q));
+    items.truncate(60);
+    items
+}
+
 /// ⇧⌘P: search every command by name and run it.
 pub fn palette(app: &mut SlideApp, ctx: &egui::Context) {
     let Some((mut query, mut sel)) = app.palette.take() else { return };
@@ -66,17 +82,7 @@ pub fn palette(app: &mut SlideApp, ctx: &egui::Context) {
             let r = ui.add(egui::TextEdit::singleline(&mut query).hint_text("Search commands…").desired_width(f32::INFINITY).font(theme::font(15.0)));
             r.request_focus();
             let q = query.to_lowercase();
-            let mut items: Vec<(String, String, Option<&'static str>)> = app
-                .session
-                .commands()
-                .into_iter()
-                .filter(|c| c.enabled)
-                .map(|c| (c.id.to_string(), c.label.to_string(), c.shortcut))
-                .chain(crate::UI_COMMANDS.iter().map(|c| (c.0.to_string(), c.1.to_string(), c.2)))
-                .filter(|(id, label, _)| q.is_empty() || label.to_lowercase().contains(&q) || id.to_lowercase().contains(&q))
-                .collect();
-            items.sort_by_key(|(_, l, _)| !l.to_lowercase().starts_with(&q));
-            items.truncate(60);
+            let items = palette_items(&app.session, &q);
             let (down, up, enter, esc) = ui.input(|i| {
                 (
                     i.key_pressed(egui::Key::ArrowDown),
@@ -245,3 +251,25 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
         ("Help", vec![("About DeckCraft", "app.about"), ("Command Palette", "app.palette")]),
     ]
 }
+
+#[cfg(test)]
+mod tests {
+    use super::palette_items;
+
+    /// #79: the palette listed two "Export…" entries and the first (`file.export`) failed with "missing `path`".
+    #[test]
+    fn palette_has_one_export_entry_that_opens_the_dialog() {
+        let session = deckcraft_engine::Session::with_new();
+        for query in ["exp", "export"] {
+            let exports: Vec<_> = palette_items(&session, query).into_iter().filter(|(_, label, _)| label == "Export…").collect();
+            assert_eq!(exports.len(), 1, "query {query}");
+            assert_eq!(exports[0].0, "app.exportDialog");
+        }
+        // Open…, Save As…, Audio/Video from File… and Notes had the same duplicates: every UI command is the only entry with its label.
+        for (id, label, _, _) in crate::UI_COMMANDS {
+            let same: Vec<_> = palette_items(&session, &label.to_lowercase()).into_iter().filter(|(_, l, _)| l == label).collect();
+            assert_eq!(same.len(), 1, "{label}");
+            assert_eq!(same[0].0, *id, "{label}");
+        }
+    }
+}

From cebf667579cf4fa4aa8e78f4b27a805864515112 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sat, 10 Oct 2026 19:03:35 +0200
Subject: [PATCH 007/376] Paste: Ctrl+V pastes an image-only clipboard as a
 picture (#53)

---
 crates/ui-egui/src/lib.rs | 59 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index bef64a4f..b72bf753 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -209,6 +209,8 @@ pub struct SlideApp {
     pub(crate) notes_buf: (u64, usize, String),
     /// Thumbnail pane drag (slide index, current drop index).
     pub(crate) thumb_drag: Option<(usize, usize)>,
+    /// A V key press or a Paste event arrived since the last V release (see `keyboard`).
+    v_seen: bool,
 }
 
 impl SlideApp {
@@ -244,6 +246,7 @@ impl SlideApp {
             quit_confirmed: false,
             notes_buf: (0, usize::MAX, String::new()),
             thumb_drag: None,
+            v_seen: false,
         }
     }
 
@@ -607,10 +610,21 @@ impl SlideApp {
 
     /// Keyboard and clipboard for the slide (when no text field has focus).
     fn keyboard(&mut self, ctx: &egui::Context) {
+        let events = ctx.input(|i| i.events.clone());
+        // Ctrl+V with only an image on the clipboard: egui-winit sends no Paste event and swallows the
+        // key press, so the release of a V press never seen is the paste. Tracked even while a text
+        // field has focus, so that a V typed there is not taken for one.
+        let mut image_paste = false;
+        for e in &events {
+            match e {
+                egui::Event::Paste(_) | egui::Event::Key { key: egui::Key::V, pressed: true, .. } => self.v_seen = true,
+                egui::Event::Key { key: egui::Key::V, pressed: false, .. } => image_paste = !std::mem::take(&mut self.v_seen),
+                _ => {}
+            }
+        }
         if ctx.memory(|m| m.focused().is_some()) || self.dialog.as_ref().is_some_and(|d| d.modal()) || self.palette.is_some() {
             return;
         }
-        let events = ctx.input(|i| i.events.clone());
         if self.home_open() {
             // Only app shortcuts (Open, Command Palette…) and Escape, which goes back to the
             // presentation: typing, pasting or deleting would edit the hidden presentation.
@@ -627,6 +641,13 @@ impl SlideApp {
             self.drain_requests();
             return;
         }
+        let img = if image_paste { self.services.clipboard_image.as_mut().and_then(|f| f()) } else { None };
+        if let Some(png) = img {
+            let data = deckcraft_engine::cmd::base64_encode(&png);
+            if let Err(e) = self.session.execute("insert.picture", &json!({"name": "Pasted image.png", "data": data})) {
+                self.set_status(e.to_string());
+            }
+        }
         for e in events {
             match e {
                 egui::Event::Text(t) => {
@@ -932,6 +953,42 @@ mod tests {
         assert_eq!(harness.state().session.documents().len(), 2);
     }
 
+    /// #53: Ctrl+V did nothing for an image-only clipboard: egui-winit sends no Paste event for it and
+    /// swallows the key press, so only the V release reaches the app.
+    #[test]
+    fn ctrl_v_pastes_an_image_when_no_paste_event_arrives() {
+        let session = Session::with_new();
+        let png = {
+            let d = session.active().unwrap();
+            deckcraft_engine::cmd::file::render_png(&d.doc, 0, 0.1, false).0
+        };
+        assert!(!png.is_empty());
+        let services = Services { clipboard_image: Some(Box::new(move || Some(png.clone()))), ..Default::default() };
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(session, services),
+        );
+        harness.run_steps(2);
+        let pictures = |app: &SlideApp| {
+            let d = app.session.active().unwrap();
+            d.doc.slides[0].shapes.iter().filter(|s| matches!(s.kind, deckcraft_model::ShapeKind::Picture { .. })).count()
+        };
+        let v = |pressed| egui::Event::Key { key: egui::Key::V, physical_key: None, pressed, repeat: false, modifiers: egui::Modifiers::COMMAND };
+        // A text paste (Paste event on the press) does not also paste the image on release.
+        harness.event(egui::Event::Paste("hello".into()));
+        harness.run_steps(2);
+        harness.event(v(false));
+        harness.run_steps(2);
+        assert_eq!(pictures(harness.state()), 0);
+        // What egui-winit sends for Ctrl+V with only an image on the clipboard: the release alone.
+        harness.event(v(false));
+        harness.run_steps(2);
+        assert_eq!(pictures(harness.state()), 1);
+    }
+
     #[test]
     fn home_needs_an_open_presentation() {
         let mut app = SlideApp::new(Session::new(), Services::default());

From 20366a8ea9da5f04aa9187ff4d391a011ea29ea7 Mon Sep 17 00:00:00 2001
From: Mikkel Georgsen <7456949+mikl0s@users.noreply.github.com>
Date: Sat, 10 Oct 2026 18:33:10 +0200
Subject: [PATCH 008/376] Export: an unknown format is an error instead of a
 deckcraft file

file.export with an explicit format outside png, jpeg, jpg, pdf, pptx, potx,
ppsx, deckcraft, outline and txt fell through to the native deckcraft zip, so a
request for "docx" reported success and wrote a deckcraft archive under that
name. It now returns an error and writes nothing. A format inferred from the
file extension behaves as before.
---
 crates/engine/src/cmd/file.rs |  5 +++--
 crates/mcp/src/tests.rs       | 12 ++++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index 55aac8bd..dc7840e4 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -264,11 +264,12 @@ fn export(s: &mut Session, p: &Value) -> Result<Value> {
             write_file(&path, &bytes)?;
             Ok(json!({"path": path, "bytes": bytes.len()}))
         }
-        other => {
-            let bytes = save_bytes(&st.doc, other)?;
+        "pptx" | "potx" | "ppsx" | "deckcraft" | "outline" | "txt" => {
+            let bytes = save_bytes(&st.doc, &format)?;
             write_file(&path, &bytes)?;
             Ok(json!({"path": path, "bytes": bytes.len()}))
         }
+        other => Err(bad("file.export", format!("unknown format `{other}`"))),
     }
 }
 
diff --git a/crates/mcp/src/tests.rs b/crates/mcp/src/tests.rs
index b1521521..ec9110a2 100644
--- a/crates/mcp/src/tests.rs
+++ b/crates/mcp/src/tests.rs
@@ -117,3 +117,15 @@ fn export_tool_lists_pdf_and_its_options() {
     }
     let _ = std::fs::remove_dir_all(&dir);
 }
+
+#[test]
+fn export_rejects_unknown_format() {
+    let mut s = Server::new(Box::new(Headless::new()));
+    tool(&mut s, "new_presentation", json!({"theme": "Harbor"}));
+    let path = std::env::temp_dir().join(format!("deckcraft-mcp-unknown-format-{}.docx", std::process::id()));
+    let _ = std::fs::remove_file(&path);
+    let r = call(&mut s, 1, "tools/call", json!({"name": "export", "arguments": {"path": path.to_str().unwrap(), "format": "docx"}}));
+    assert_eq!(r["result"]["isError"], true, "{r}");
+    assert!(r["result"]["content"][0]["text"].as_str().unwrap().contains("docx"), "{r}");
+    assert!(!path.exists(), "nothing may be written for an unknown format");
+}

From d34b5df775cd4dcbdbd4ef7b381493db30928807 Mon Sep 17 00:00:00 2001
From: Mikkel Georgsen <7456949+mikl0s@users.noreply.github.com>
Date: Sat, 10 Oct 2026 18:40:53 +0200
Subject: [PATCH 009/376] Slides: going to a slide that does not exist is an
 error

slide.go clamped an out-of-range index to the last slide and reported
success, so a request for slide 99 of a short deck landed on the last slide
without a word. It now returns an error and stays on the current slide. A slide
id beyond u32 is reported as an unknown slide instead of being read as id 0.
---
 crates/engine/src/cmd/slide.rs |  9 ++++++++-
 crates/mcp/src/tests.rs        | 20 ++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/cmd/slide.rs b/crates/engine/src/cmd/slide.rs
index 3d8ad344..367c269e 100644
--- a/crates/engine/src/cmd/slide.rs
+++ b/crates/engine/src/cmd/slide.rs
@@ -283,9 +283,16 @@ fn go_to(s: &mut Session, i: usize) -> Result<Value> {
 fn go(s: &mut Session, p: &Value) -> Result<Value> {
     let i = match (usize_param(p, "index"), p.get("id").and_then(Value::as_u64)) {
         (Some(i), _) => i,
-        (None, Some(id)) => s.doc()?.doc.slide_index(SlideId(u32::try_from(id).unwrap_or(0))).ok_or_else(|| bad("slide.go", "no such slide"))?,
+        (None, Some(id)) => s
+            .doc()?
+            .doc
+            .slide_index(SlideId(u32::try_from(id).map_err(|_| bad("slide.go", "no such slide"))?))
+            .ok_or_else(|| bad("slide.go", "no such slide"))?,
         _ => return Err(bad("slide.go", "missing `index`")),
     };
+    if i >= s.doc()?.doc.slides.len() {
+        return Err(bad("slide.go", format!("no slide {i}")));
+    }
     go_to(s, i)
 }
 fn next(s: &mut Session, _p: &Value) -> Result<Value> {
diff --git a/crates/mcp/src/tests.rs b/crates/mcp/src/tests.rs
index b1521521..6c14f208 100644
--- a/crates/mcp/src/tests.rs
+++ b/crates/mcp/src/tests.rs
@@ -90,6 +90,26 @@ fn errors_are_reported_not_panics() {
     assert_eq!(r["result"]["isError"], true);
 }
 
+fn current_slide_title(s: &mut Server) -> Value {
+    tool(s, "inspect_slide", json!({}))["title"].clone()
+}
+
+#[test]
+fn go_to_slide_out_of_range_is_error() {
+    let mut s = Server::new(Box::new(Headless::new()));
+    tool(&mut s, "new_presentation", json!({"theme": "Harbor"}));
+    tool(&mut s, "add_slide", json!({"layout": "titleAndContent", "title": "Second", "body": "x"}));
+    // Boundaries stay valid: first and last slide.
+    tool(&mut s, "go_to_slide", json!({"index": 0}));
+    tool(&mut s, "go_to_slide", json!({"index": 1}));
+    assert_eq!(current_slide_title(&mut s), "Second");
+    for bad in [json!(2), json!(99)] {
+        let r = call(&mut s, 1, "tools/call", json!({"name": "go_to_slide", "arguments": {"index": bad}}));
+        assert_eq!(r["result"]["isError"], true, "{bad}: {r}");
+        assert_eq!(current_slide_title(&mut s), "Second", "failed go_to_slide must not move");
+    }
+}
+
 #[test]
 fn export_tool_lists_pdf_and_its_options() {
     let mut s = Server::new(Box::new(Headless::new()));

From 736dd52b51c6525dd479242059694b963bdfd950 Mon Sep 17 00:00:00 2001
From: Mikkel Georgsen <7456949+mikl0s@users.noreply.github.com>
Date: Sat, 10 Oct 2026 18:41:04 +0200
Subject: [PATCH 010/376] Commands: an invalid shape id is an error instead of
 the selection

A shape id that was present but not a valid id (negative, not an integer,
larger than u32) was treated as absent, so commands such as text.set and
text.edit silently edited the selected shape instead. id_param now tells three
cases apart: absent (the selection fallback is unchanged), valid, and invalid
(an error naming the command). arrange, edit (select), inspect, review, table,
text and the animation painter pick this up.
---
 crates/engine/src/cmd/animation.rs |  2 +-
 crates/engine/src/cmd/arrange.rs   |  2 +-
 crates/engine/src/cmd/edit.rs      |  5 +++-
 crates/engine/src/cmd/inspect.rs   |  3 ++-
 crates/engine/src/cmd/mod.rs       | 15 ++++++++---
 crates/engine/src/cmd/review.rs    |  2 +-
 crates/engine/src/cmd/table.rs     |  4 +--
 crates/engine/src/cmd/text.rs      |  6 ++---
 crates/mcp/src/tests.rs            | 41 ++++++++++++++++++++++++++++++
 9 files changed, 67 insertions(+), 13 deletions(-)

diff --git a/crates/engine/src/cmd/animation.rs b/crates/engine/src/cmd/animation.rs
index 8b6fe5a7..5804fee6 100644
--- a/crates/engine/src/cmd/animation.rs
+++ b/crates/engine/src/cmd/animation.rs
@@ -305,7 +305,7 @@ fn get(s: &mut Session, p: &Value) -> Result<Value> {
 
 fn painter_pick(s: &mut Session, p: &Value) -> Result<Value> {
     let st = s.doc()?;
-    let id = id_param(p, "id")
+    let id = id_param(p, "id", "animation.painter")?
         .or_else(|| st.selection.shapes.first().copied())
         .ok_or_else(|| bad("animation.painter", "select an animated shape first"))?;
     let sl = st.current_slide().ok_or_else(|| bad("animation.painter", "no slide"))?;
diff --git a/crates/engine/src/cmd/arrange.rs b/crates/engine/src/cmd/arrange.rs
index c755050e..f195442d 100644
--- a/crates/engine/src/cmd/arrange.rs
+++ b/crates/engine/src/cmd/arrange.rs
@@ -86,7 +86,7 @@ fn order(s: &mut Session, p: &Value, how: i32) -> Result<Value> {
 }
 
 fn reorder(s: &mut Session, p: &Value) -> Result<Value> {
-    let id = id_param(p, "id").ok_or_else(|| bad("arrange.reorder", "missing `id`"))?;
+    let id = id_param(p, "id", "arrange.reorder")?.ok_or_else(|| bad("arrange.reorder", "missing `id`"))?;
     let to = usize_param(p, "index").ok_or_else(|| bad("arrange.reorder", "missing `index`"))?;
     s.edit(|doc, sel| {
         let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("arrange.reorder", "no slide"))?;
diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 30437b15..8d744acf 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -353,7 +353,10 @@ fn deselect(s: &mut Session, _p: &Value) -> Result<Value> {
 }
 
 fn select(s: &mut Session, p: &Value) -> Result<Value> {
-    let ids = ids_param(p, "ids").or_else(|| id_param(p, "id").map(|i| vec![i])).unwrap_or_default();
+    let ids = match ids_param(p, "ids") {
+        Some(v) => v,
+        None => id_param(p, "id", "edit.select")?.map(|i| vec![i]).unwrap_or_default(),
+    };
     let add = bool_or(p, "add", false);
     let toggle = bool_or(p, "toggle", false);
     let valid: Vec<ShapeId> = ids.into_iter().filter(|i| s.active().is_some_and(|d| d.shape(*i).is_some())).collect();
diff --git a/crates/engine/src/cmd/inspect.rs b/crates/engine/src/cmd/inspect.rs
index db162a38..fb666abc 100644
--- a/crates/engine/src/cmd/inspect.rs
+++ b/crates/engine/src/cmd/inspect.rs
@@ -136,7 +136,8 @@ fn slide(s: &mut Session, p: &Value) -> Result<Value> {
 
 fn shape(s: &mut Session, p: &Value) -> Result<Value> {
     let st = s.doc()?;
-    let id = id_param(p, "id").or_else(|| st.selection.shapes.first().copied()).ok_or_else(|| bad("shape.inspect", "missing `id`"))?;
+    let id =
+        id_param(p, "id", "shape.inspect")?.or_else(|| st.selection.shapes.first().copied()).ok_or_else(|| bad("shape.inspect", "missing `id`"))?;
     let sh = st.shape(id).ok_or_else(|| bad("shape.inspect", format!("no shape {id}")))?;
     let x = xfrm_of(&st.doc, &st.selection, sh);
     Ok(json!({"shape": serde_json::to_value(sh).unwrap_or_default(), "box": x}))
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index 29c7013e..ebc56c75 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -171,8 +171,17 @@ pub(crate) fn str_param<'a>(p: &'a Value, key: &str) -> Option<&'a str> {
 pub(crate) fn usize_param(p: &Value, key: &str) -> Option<usize> {
     p.get(key).and_then(Value::as_u64).and_then(|v| usize::try_from(v).ok())
 }
-pub(crate) fn id_param(p: &Value, key: &str) -> Option<ShapeId> {
-    p.get(key).and_then(Value::as_u64).and_then(|v| u32::try_from(v).ok()).map(ShapeId)
+/// A shape id param: `Ok(None)` when absent (callers may fall back to the selection), `Err` when
+/// present but not a valid id (negative, non-integer, beyond `u32`), so a bad id never edits the selection.
+pub(crate) fn id_param(p: &Value, key: &str, cmd: &str) -> Result<Option<ShapeId>> {
+    match p.get(key) {
+        None | Some(Value::Null) => Ok(None),
+        Some(v) => v
+            .as_u64()
+            .and_then(|v| u32::try_from(v).ok())
+            .map(|v| Some(ShapeId(v)))
+            .ok_or_else(|| bad(cmd, format!("`{key}` is not a valid shape id: {v}"))),
+    }
 }
 pub(crate) fn ids_param(p: &Value, key: &str) -> Option<Vec<ShapeId>> {
     p.get(key).and_then(Value::as_array).map(|a| a.iter().filter_map(Value::as_u64).filter_map(|v| u32::try_from(v).ok()).map(ShapeId).collect())
@@ -196,7 +205,7 @@ pub(crate) fn targets(s: &Session, p: &Value) -> Result<Vec<ShapeId>> {
     {
         return Ok(ids);
     }
-    if let Some(id) = id_param(p, "id") {
+    if let Some(id) = id_param(p, "id", "shape")? {
         return Ok(vec![id]);
     }
     Ok(s.doc()?.selection.shapes.clone())
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 8e3a532c..72616274 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -60,7 +60,7 @@ fn now() -> String {
 fn add(s: &mut Session, p: &Value) -> Result<Value> {
     let text = str_param(p, "text").ok_or_else(|| bad("comment.add", "missing `text`"))?.to_string();
     let author = s.prefs.author.clone();
-    let shape = id_param(p, "id").or_else(|| s.active().and_then(|d| d.selection.shapes.first().copied()));
+    let shape = id_param(p, "id", "comment.add")?.or_else(|| s.active().and_then(|d| d.selection.shapes.first().copied()));
     let (x, y) = (f64_or(p, "x", 10.0), f64_or(p, "y", 10.0));
     s.edit(|doc, sel| {
         let sl = Arc::make_mut(doc.slides.get_mut(sel.slide).ok_or_else(|| bad("comment.add", "no slide"))?);
diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index e9f6f164..757aab6d 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -78,7 +78,7 @@ fn at(s: &Session, p: &Value) -> (usize, usize) {
 }
 
 fn with_table(s: &mut Session, p: &Value, cmd: &str, f: impl Fn(&mut Table) -> Result<()>) -> Result<Value> {
-    let id = match id_param(p, "id") {
+    let id = match id_param(p, "id", cmd)? {
         Some(i) => i,
         None => {
             let st = s.doc()?;
@@ -253,7 +253,7 @@ fn row_height(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 fn select_cells(s: &mut Session, p: &Value) -> Result<Value> {
-    let id = match id_param(p, "id") {
+    let id = match id_param(p, "id", "table.selectCells")? {
         Some(i) => i,
         None => s.doc()?.selection.shapes.first().copied().ok_or_else(|| bad("table.selectCells", "select a table"))?,
     };
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 48be3a51..ee58986f 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -158,7 +158,7 @@ fn edit(s: &mut Session, p: &Value) -> Result<Value> {
         })?;
         return ok();
     }
-    let id = match id_param(p, "id") {
+    let id = match id_param(p, "id", "text.edit")? {
         Some(i) => i,
         None => s.doc()?.selection.shapes.first().copied().ok_or_else(|| bad("text.edit", "select a shape with text"))?,
     };
@@ -491,7 +491,7 @@ fn select_para(s: &mut Session, p: &Value) -> Result<Value> {
 
 fn set(s: &mut Session, p: &Value) -> Result<Value> {
     let text = str_param(p, "text").ok_or_else(|| bad("text.set", "missing `text`"))?.to_string();
-    let id = match id_param(p, "id") {
+    let id = match id_param(p, "id", "text.set")? {
         Some(i) => i,
         None => s.doc()?.selection.shapes.first().copied().ok_or_else(|| bad("text.set", "missing `id` (or select a shape)"))?,
     };
@@ -531,7 +531,7 @@ fn set(s: &mut Session, p: &Value) -> Result<Value> {
 
 fn get(s: &mut Session, p: &Value) -> Result<Value> {
     let st = s.doc()?;
-    let id = match id_param(p, "id") {
+    let id = match id_param(p, "id", "text.get")? {
         Some(i) => i,
         None => match &st.selection.text {
             Some(t) => t.shape,
diff --git a/crates/mcp/src/tests.rs b/crates/mcp/src/tests.rs
index b1521521..b2e92455 100644
--- a/crates/mcp/src/tests.rs
+++ b/crates/mcp/src/tests.rs
@@ -79,6 +79,47 @@ fn agent_builds_a_deck() {
     assert_eq!(n2, n1 + 1);
 }
 
+#[test]
+fn set_text_unknown_id_is_error() {
+    let mut s = Server::new(Box::new(Headless::new()));
+    tool(&mut s, "new_presentation", json!({"theme": "Harbor"}));
+    let title_id = tool(&mut s, "inspect_slide", json!({}))["shapes"][0]["id"].as_u64().unwrap();
+    tool(&mut s, "select", json!({"ids": [title_id]}));
+    // -1 and 2^32 are not shape ids; they must not fall back to the selection.
+    for bad in [json!(999999), json!(-1), json!(4294967296u64)] {
+        let r = call(&mut s, 1, "tools/call", json!({"name": "set_text", "arguments": {"id": bad, "text": "x"}}));
+        assert_eq!(r["result"]["isError"], true, "{bad}: {r}");
+    }
+    // A real id, and a just-created shape, still work; omitting id still uses the selection.
+    tool(&mut s, "set_text", json!({"id": title_id, "text": "Real"}));
+    let sid = tool(&mut s, "add_shape", json!({"preset": "rect", "x": 10, "y": 10, "w": 50, "h": 50}))["id"].as_u64().unwrap();
+    tool(&mut s, "set_text", json!({"id": sid, "text": "Fresh"}));
+    tool(&mut s, "select", json!({"ids": [title_id]}));
+    tool(&mut s, "set_text", json!({"text": "Selected"}));
+    let sl = tool(&mut s, "inspect_slide", json!({}));
+    let text_of = |id: u64| sl["shapes"].as_array().unwrap().iter().find(|x| x["id"].as_u64() == Some(id)).unwrap()["text"].clone();
+    assert_eq!(text_of(sid), "Fresh");
+    assert_eq!(text_of(title_id), "Selected");
+}
+
+#[test]
+fn invalid_id_never_falls_back_to_selection() {
+    let mut s = Server::new(Box::new(Headless::new()));
+    tool(&mut s, "new_presentation", json!({"theme": "Harbor"}));
+    let title_id = tool(&mut s, "inspect_slide", json!({}))["shapes"][0]["id"].as_u64().unwrap();
+    tool(&mut s, "select", json!({"ids": [title_id]}));
+    for cmd in ["text.edit", "text.get", "shape.inspect", "table.selectCells", "arrange.reorder"] {
+        for bad in [json!(-1), json!(1.5), json!("7"), json!(4294967296u64)] {
+            let r = call(&mut s, 1, "tools/call", json!({"name": "run_command", "arguments": {"command": cmd, "params": {"id": bad, "index": 0}}}));
+            assert_eq!(r["result"]["isError"], true, "{cmd} {bad}: {r}");
+        }
+    }
+    // Absent id still means the selection, and a real id still works.
+    tool(&mut s, "run_command", json!({"command": "text.get", "params": {}}));
+    tool(&mut s, "run_command", json!({"command": "text.get", "params": {"id": title_id}}));
+    tool(&mut s, "run_command", json!({"command": "shape.inspect", "params": {"id": title_id}}));
+}
+
 #[test]
 fn errors_are_reported_not_panics() {
     let mut s = Server::new(Box::new(Headless::new()));

From 35d265891c83898431b9d5e7395e07f7e27fa678 Mon Sep 17 00:00:00 2001
From: "Dylan M. Taylor" <dylan@dylanmtaylor.com>
Date: Sat, 10 Oct 2026 17:28:25 -0400
Subject: [PATCH 011/376] docs(readme): percent-encode middle dot in platforms
 badge url

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index ceb6a8c4..168c4725 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@
   <img alt="Status: early development" src="https://img.shields.io/badge/status-early%20development-f26b1d?style=flat-square">
   <img alt="License: MIT OR Apache-2.0" src="https://img.shields.io/badge/license-MIT%20OR%20Apache--2.0-blue?style=flat-square">
   <img alt="Written in Rust" src="https://img.shields.io/badge/written%20in-Rust-b7410e?style=flat-square">
-  <img alt="Platforms" src="https://img.shields.io/badge/platforms-macOS%20·%20Windows%20·%20Linux%20·%20BSD%20·%20Web-555?style=flat-square">
+  <img alt="Platforms" src="https://img.shields.io/badge/platforms-macOS%20%C2%B7%20Windows%20%C2%B7%20Linux%20%C2%B7%20BSD%20%C2%B7%20Web-555?style=flat-square">
 </p>
 
 <p align="center">

From 04069e19682c3c20d19ad7492dc53fb4b8f6879d Mon Sep 17 00:00:00 2001
From: Alexander Alber <90604107+alexanderalber@users.noreply.github.com>
Date: Sun, 11 Oct 2026 09:03:01 +0200
Subject: [PATCH 012/376] Morph: text boxes without a partner fade in place
 instead of moving (#119)

The last matching pass paired any two shapes of one kind and preset
geometry, so a text box leaving the slide was paired with an unrelated
one arriving and flew across to it. That pass now only pairs shapes
without text: a text box needs its name or its text on the other slide
to morph, otherwise it fades out (or in) where it is, as in PowerPoint.

generated with Claude Code
---
 crates/anim/src/morph.rs |  7 +++++--
 crates/anim/src/tests.rs | 20 ++++++++++++++++++++
 docs/animation-parity.md |  3 ++-
 3 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/crates/anim/src/morph.rs b/crates/anim/src/morph.rs
index b5808c4f..1d4ab8f3 100644
--- a/crates/anim/src/morph.rs
+++ b/crates/anim/src/morph.rs
@@ -12,7 +12,9 @@ fn text_of(s: &Shape) -> String {
 
 /// Pairs of (shape on `a`, shape on `b`) that Morph animates from one to the other: first by
 /// `!!name` (forced match), then by exact name, then by the same kind and text, then by the same
-/// kind and preset geometry. Each shape is used once; top-level shapes only (groups move whole).
+/// kind and preset geometry if neither carries text. A text box with neither a name nor its text on
+/// the other slide stays unpaired and fades in place, as in PowerPoint (#119). Each shape is used
+/// once; top-level shapes only (groups move whole).
 pub fn morph_pairs(a: &Slide, b: &Slide) -> Vec<(ShapeId, ShapeId)> {
     let mut pairs: Vec<(ShapeId, ShapeId)> = Vec::new();
     let mut used_a = vec![false; a.shapes.len()];
@@ -31,7 +33,8 @@ pub fn morph_pairs(a: &Slide, b: &Slide) -> Vec<(ShapeId, ShapeId)> {
             x.kind_name() == y.kind_name()
                 && x.geom.preset_name().is_some()
                 && x.geom.preset_name() == y.geom.preset_name()
-                && text_of(x).trim().is_empty() == text_of(y).trim().is_empty()
+                && text_of(x).trim().is_empty()
+                && text_of(y).trim().is_empty()
         },
     ];
     for pass in passes {
diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..de9c40ab 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -529,6 +529,26 @@ fn morph_pairs_by_name_text_and_geometry() {
     assert!(morph_pairs(&Slide::default(), &b).is_empty());
 }
 
+#[test]
+fn morph_pairs_leaves_unrelated_text_boxes_alone() {
+    // A text box that leaves and an unrelated one that arrives fade in place (#119).
+    let p = deckcraft_model::defaults::new_presentation(None);
+    let mut a = Slide::default();
+    let mut b = Slide::default();
+    let tb = |id, name, x, text| Shape { xfrm: Some(Xfrm::new(x, 100.0, 200.0, 100.0)), text: Some(TextBody::from_text(text)), ..shape(id, name) };
+    a.shapes = vec![tb(1, "TextBox 1", 0.0, "Gone")];
+    b.shapes = vec![tb(2, "TextBox 2", 400.0, "New")];
+    assert!(morph_pairs(&a, &b).is_empty());
+    let f = morph_frame(&p, &a, &b, 0.5, &|_| false);
+    let xs: Vec<(&str, f64)> = f.shapes.iter().map(|(s, _)| (s.name.as_str(), s.xfrm.map_or(f64::NAN, |x| x.x))).collect();
+    assert_eq!(xs, [("TextBox 1", 0.0), ("TextBox 2", 400.0)]);
+    // Empty shapes of one kind and geometry still pair, and a named text box keeps its partner.
+    a.shapes.push(shape(3, "Rect A"));
+    b.shapes.push(shape(4, "Rect B"));
+    b.shapes[0].name = "TextBox 1".into();
+    assert_eq!(morph_pairs(&a, &b), [(ShapeId(1), ShapeId(2)), (ShapeId(3), ShapeId(4))]);
+}
+
 #[test]
 fn morph_xfrm_interpolates() {
     let a = Xfrm { rot: 350.0, ..Xfrm::new(0.0, 0.0, 100.0, 100.0) };
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 1d50766b..74d246f1 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -24,7 +24,7 @@ three groups, with its Effect Options. All 48 round-trip through PPTX
 | Duration, advance on click / after time, Apply To All | yes | yes |
 | Transition sounds | yes | **no** (the model has the field; no picker, no playback) |
 | Preview in the editor | yes | yes |
-| Morph: objects move, resize, recolour | yes | yes |
+| Morph: objects move, resize, recolour; unmatched text boxes fade in place | yes | yes (#119) |
 | Morph: Words and Characters | yes | yes (#5) |
 | Morph: geometry (circle to star) | yes | yes (#27) |
 | Morph: `!!` name forcing, pictures, 3-D models, ink | yes | names partly; no 3-D or ink |
@@ -76,4 +76,5 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Morph leaves unrelated text boxes unpaired: they fade in place (#119) |
 | 2026-10-10 | major | Created: 48/48 transitions, 64 of ~190 animation effects, pane and option depth, estimates |

From 7db770d91dfc254e93f9f4528197a806ef34ef33 Mon Sep 17 00:00:00 2001
From: Alexander Alber <90604107+alexanderalber@users.noreply.github.com>
Date: Sun, 11 Oct 2026 09:16:27 +0200
Subject: [PATCH 013/376] Morph: a picture cropped differently on the next
 slide morphs its crop (#118)

Two paired pictures that differed only in crop counted as changed
content, so the new one faded in over the old one on the moving box.
Now they stay one picture whose crop morphs: the whole image moves and
scales linearly between where it lies on either slide, and each frame's
crop is what the interpolated box shows of it (morph_crop).

generated with Claude Code
---
 crates/anim/src/lib.rs   |  2 +-
 crates/anim/src/morph.rs | 63 ++++++++++++++++++++++++++++++++++++++--
 crates/anim/src/tests.rs | 35 ++++++++++++++++++++++
 docs/animation-parity.md |  3 +-
 4 files changed, 99 insertions(+), 4 deletions(-)

diff --git a/crates/anim/src/lib.rs b/crates/anim/src/lib.rs
index fae7e4dd..bea76eb8 100644
--- a/crates/anim/src/lib.rs
+++ b/crates/anim/src/lib.rs
@@ -27,7 +27,7 @@ pub use deckcraft_model::Rgba;
 use serde::{Deserialize, Serialize};
 
 pub use easing::ease;
-pub use morph::{MorphFrame, MorphPath, MorphText, morph_frame, morph_pairs, morph_xfrm};
+pub use morph::{MorphFrame, MorphPath, MorphText, morph_crop, morph_frame, morph_pairs, morph_xfrm};
 pub use path::{MotionPath, default_path};
 pub use show::{LinkJump, ShowAction, ShowState, safe_url, show_order};
 pub use timeline::{EffectTiming, Sequence, Timeline, TriggerPlay};
diff --git a/crates/anim/src/morph.rs b/crates/anim/src/morph.rs
index b5808c4f..96bd761b 100644
--- a/crates/anim/src/morph.rs
+++ b/crates/anim/src/morph.rs
@@ -173,9 +173,58 @@ fn reshaped(a: &Shape, b: &Shape) -> bool {
     a.geom != b.geom && outlined(a) && outlined(b) && Shape { geom: Geom::default(), ..content(a) } == Shape { geom: Geom::default(), ..content(b) }
 }
 
+/// The content of a shape apart from what Morph interpolates, with a picture's crop left out.
+fn uncropped(s: &Shape) -> Shape {
+    let mut c = content(s);
+    if let ShapeKind::Picture { fill } = &mut c.kind {
+        fill.crop = [0.0; 4];
+    }
+    c
+}
+
+fn crop_of(s: &Shape) -> [f64; 4] {
+    match &s.kind {
+        ShapeKind::Picture { fill } => fill.crop,
+        _ => [0.0; 4],
+    }
+}
+
+/// Whether two pictures differ in their crop only (apart from box and fill), so the crop can morph.
+fn recropped(a: &Shape, b: &Shape) -> bool {
+    matches!(a.kind, ShapeKind::Picture { .. }) && crop_of(a) != crop_of(b) && uncropped(a) == uncropped(b)
+}
+
+/// The crop (left, top, right, bottom) of a picture morphing from box `xa` cropped by `ca` to box
+/// `xb` cropped by `cb`, when its box is `x` at progress `t`: the whole image moves and scales
+/// linearly between where it lies on either slide, and the crop is what of it `x` shows. Falls back
+/// to blending the crops when a crop leaves nothing visible.
+pub fn morph_crop(ca: [f64; 4], xa: Xfrm, cb: [f64; 4], xb: Xfrm, x: Xfrm, t: f64) -> [f64; 4] {
+    // Along one axis: (box start, box size, crop before, crop after) → the crops at `t`.
+    let axis = |(pa, sa, la, ha): (f64, f64, f64, f64), (pb, sb, lb, hb): (f64, f64, f64, f64), (p, s): (f64, f64)| {
+        let (va, vb) = (1.0 - la - ha, 1.0 - lb - hb);
+        if va <= 1e-6 || vb <= 1e-6 {
+            return (lerp(la, lb, t), lerp(ha, hb, t));
+        }
+        // The whole image: its extent and start on either slide.
+        let (ea, eb) = (sa / va, sb / vb);
+        let e = lerp(ea, eb, t);
+        if !e.is_finite() || e.abs() <= 1e-9 {
+            return (lerp(la, lb, t), lerp(ha, hb, t));
+        }
+        let o = lerp(pa - la * ea, pb - lb * eb, t);
+        let lo = (p - o) / e;
+        (lo, 1.0 - lo - s / e)
+    };
+    let (l, r) = axis((xa.x, xa.w, ca[0], ca[2]), (xb.x, xb.w, cb[0], cb[2]), (x.x, x.w));
+    let (tp, bt) = axis((xa.y, xa.h, ca[1], ca[3]), (xb.y, xb.h, cb[1], cb[3]), (x.y, x.h));
+    let c = [l, tp, r, bt];
+    if c.iter().all(|v| v.is_finite()) { c } else { cb }
+}
+
 /// Morph frame from slide `a` to slide `b` at progress `t` (0..1, eased here). Paired shapes
 /// ([`morph_pairs`]) move along [`morph_xfrm`]; when they differ only in solid fill colour the
-/// colour blends, when only in geometry (and fill colour) the outline morphs ([`MorphFrame::paths`]),
+/// colour blends, when pictures differ only in crop the crop morphs ([`morph_crop`]), when only
+/// in geometry (and fill colour) the outline morphs ([`MorphFrame::paths`]),
 /// otherwise the new shape fades in under the fading old one on the same moving
 /// box; with the transition option `words` or `characters` their texts are listed in
 /// [`MorphFrame::text`] to morph word by word or character by character. Unpaired shapes of `a` fade out, unpaired shapes of `b` fade in, and shapes of `b` for
@@ -223,8 +272,18 @@ pub fn morph_frame(pres: &Presentation, a: &Slide, b: &Slide, t: f64, hidden_b:
             (_, xb) => xb,
         };
         let reshape = reshaped(sa, sb);
-        if reshape || content(sa) == content(sb) {
+        let recrop = recropped(sa, sb);
+        if reshape || recrop || content(sa) == content(sb) {
             let mut m = Shape { xfrm: x, ..sb.clone() };
+            if recrop && let ShapeKind::Picture { fill } = &mut m.kind {
+                fill.crop = match (xa, xb, x) {
+                    (Some(xa), Some(xb), Some(x)) => morph_crop(crop_of(sa), xa, crop_of(sb), xb, x, s),
+                    _ => {
+                        let (ca, cb) = (crop_of(sa), crop_of(sb));
+                        [lerp(ca[0], cb[0], s), lerp(ca[1], cb[1], s), lerp(ca[2], cb[2], s), lerp(ca[3], cb[3], s)]
+                    }
+                };
+            }
             if let (Some(fa), Some(fb)) = (solid_color(ca.as_ref(), sa), solid_color(cb.as_ref(), sb))
                 && fa != fb
             {
diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..4d4a7745 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -529,6 +529,41 @@ fn morph_pairs_by_name_text_and_geometry() {
     assert!(morph_pairs(&Slide::default(), &b).is_empty());
 }
 
+#[test]
+fn morph_crop_moves_the_image_linearly() {
+    let bx = |x, w| Xfrm::new(x, 0.0, w, 100.0);
+    // Same box, the crop pans from the left half to the right half of a 200-wide image.
+    let c = morph_crop([0.0, 0.0, 0.5, 0.0], bx(0.0, 100.0), [0.5, 0.0, 0.0, 0.0], bx(0.0, 100.0), bx(0.0, 100.0), 0.5);
+    assert!(c.iter().zip([0.25, 0.0, 0.25, 0.0]).all(|(a, b)| (a - b).abs() < 1e-9), "{c:?}");
+    // The box shrinks over an image that stays put: only the right crop grows.
+    let c = morph_crop([0.0; 4], bx(0.0, 100.0), [0.0, 0.0, 0.5, 0.0], bx(0.0, 50.0), bx(0.0, 75.0), 0.5);
+    assert!(c.iter().zip([0.0, 0.0, 0.25, 0.0]).all(|(a, b)| (a - b).abs() < 1e-9), "{c:?}");
+    // Nothing visible on one side: the crops blend.
+    let c = morph_crop([0.5, 0.0, 0.5, 0.0], bx(0.0, 100.0), [0.0; 4], bx(0.0, 100.0), bx(0.0, 100.0), 0.5);
+    assert!(c.iter().all(|v| v.is_finite()) && (c[0] - 0.25).abs() < 1e-9, "{c:?}");
+}
+
+#[test]
+fn morph_frame_morphs_a_picture_crop() {
+    // A picture recropped on the next slide stays one picture whose crop morphs (#118).
+    let p = deckcraft_model::defaults::new_presentation(None);
+    let pic = |id, crop| Shape {
+        kind: deckcraft_model::ShapeKind::Picture { fill: deckcraft_model::style::PictureFill { crop, ..Default::default() } },
+        ..shape(id, "Picture 1")
+    };
+    let mut a = Slide::default();
+    let mut b = Slide::default();
+    a.shapes = vec![pic(1, [0.0, 0.0, 0.5, 0.0])];
+    b.shapes = vec![pic(2, [0.5, 0.0, 0.0, 0.0])];
+    let f = morph_frame(&p, &a, &b, 0.5, &|_| false);
+    assert_eq!(f.shapes.len(), 1);
+    assert!(f.opacity.is_empty());
+    let deckcraft_model::ShapeKind::Picture { fill } = &f.shapes[0].0.kind else { panic!("not a picture") };
+    let want = 0.5 * f.mix;
+    assert!((fill.crop[0] - want).abs() < 1e-9 && (fill.crop[2] - (0.5 - want)).abs() < 1e-9, "{:?}", fill.crop);
+    assert_eq!(morph_frame(&p, &a, &b, 1.0, &|_| false).shapes[0].0.kind, b.shapes[0].kind);
+}
+
 #[test]
 fn morph_xfrm_interpolates() {
     let a = Xfrm { rot: 350.0, ..Xfrm::new(0.0, 0.0, 100.0, 100.0) };
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 1d50766b..7f3d9878 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -24,7 +24,7 @@ three groups, with its Effect Options. All 48 round-trip through PPTX
 | Duration, advance on click / after time, Apply To All | yes | yes |
 | Transition sounds | yes | **no** (the model has the field; no picker, no playback) |
 | Preview in the editor | yes | yes |
-| Morph: objects move, resize, recolour | yes | yes |
+| Morph: objects move, resize, recolour; a picture's crop morphs | yes | yes (#118) |
 | Morph: Words and Characters | yes | yes (#5) |
 | Morph: geometry (circle to star) | yes | yes (#27) |
 | Morph: `!!` name forcing, pictures, 3-D models, ink | yes | names partly; no 3-D or ink |
@@ -76,4 +76,5 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Morph animates a changed picture crop (#118) |
 | 2026-10-10 | major | Created: 48/48 transitions, 64 of ~190 animation effects, pane and option depth, estimates |

From 3bb284cfdd15b357bf252449e68f54cd67cc983f Mon Sep 17 00:00:00 2001
From: Alexander Alber <90604107+alexanderalber@users.noreply.github.com>
Date: Sun, 11 Oct 2026 09:26:42 +0200
Subject: [PATCH 014/376] Text: typing goes on after Tab in a text box (#78)

The engine handled Tab (a tab character, or a list level at the start of
a paragraph), but egui also treated it as focus navigation: with no
widget focused it focused the first ribbon widget, and since the slide
only takes keys while nothing is focused, every key after Tab was lost.
When the slide has the keyboard, the keyboard handler now cancels that
focus move.

This also covers the "can't type after indenting" part of #93.

generated with Claude Code
---
 crates/ui-egui/src/lib.rs | 44 +++++++++++++++++++++++++++++++++++++++
 docs/gaps.md              |  6 +-----
 docs/ui-parity.md         |  3 ++-
 3 files changed, 47 insertions(+), 6 deletions(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index bef64a4f..6983f1c7 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -664,6 +664,12 @@ impl SlideApp {
                     }
                 }
                 egui::Event::Key { key, pressed: true, modifiers, .. } => {
+                    if key == egui::Key::Tab {
+                        // The slide has the keyboard, so Tab is ours (indent, tab character, next
+                        // shape). Left to egui it would also focus the first ribbon widget, and
+                        // every key after it would go there instead of the slide (#78).
+                        ctx.memory_mut(|m| m.move_focus(egui::FocusDirection::None));
+                    }
                     let mods = Mods { shift: modifiers.shift, alt: modifiers.alt, cmd: modifiers.command || modifiers.ctrl };
                     if !self.session.tool.drawing_freeform() && menus::ui_shortcut(self, key, mods) {
                         continue;
@@ -932,6 +938,44 @@ mod tests {
         assert_eq!(harness.state().session.documents().len(), 2);
     }
 
+    /// #78: after Tab in a text box, typing and deleting no longer reached the text.
+    #[test]
+    fn typing_goes_on_after_tab_in_a_text_box() {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        let title = harness.state().session.active().unwrap().doc.slides[0].shapes[0].id.0;
+        harness.state_mut().session.execute("text.edit", &json!({"id": title})).unwrap();
+        harness.event(egui::Event::Text("ab".into()));
+        harness.run_steps(2);
+        harness.key_press(egui::Key::Tab);
+        harness.run_steps(2);
+        harness.event(egui::Event::Text("c".into()));
+        harness.run_steps(2);
+        assert_eq!(title_text(harness.state()), "ab\tc");
+        harness.key_press(egui::Key::Backspace);
+        harness.run_steps(2);
+        assert_eq!(title_text(harness.state()), "ab\t");
+        assert!(harness.state().session.active().unwrap().selection.text.is_some(), "still editing");
+        // Tab at the start of a paragraph indents it, and typing goes on there too (#93).
+        harness.key_press(egui::Key::Enter);
+        harness.run_steps(2);
+        harness.key_press(egui::Key::Tab);
+        harness.run_steps(2);
+        harness.event(egui::Event::Text("d".into()));
+        harness.run_steps(2);
+        assert_eq!(title_text(harness.state()), "ab\t\nd");
+        let level = |h: &egui_kittest::Harness<SlideApp>| {
+            h.state().session.active().unwrap().doc.slides[0].shapes[0].text.as_ref().unwrap().paragraphs[1].level
+        };
+        assert_eq!(level(&harness), 1);
+    }
+
     #[test]
     fn home_needs_an_open_presentation() {
         let mut app = SlideApp::new(Session::new(), Services::default());
diff --git a/docs/gaps.md b/docs/gaps.md
index 6ea4130a..fa303000 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -138,11 +138,6 @@ Detail in [file-format-parity.md](file-format-parity.md).
 - **Impact:** copy-paste of screenshots is a core workflow.
 - **Estimate:** 2–4 h. **Beta blocker.**
 
-### Tab inside a text box ends text entry (#78)
-- **Evidence:** #78.
-- **Impact:** tab stops and indented lists can't be typed.
-- **Estimate:** 1–2 h.
-
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
@@ -247,5 +242,6 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Removed "Tab inside a text box ends text entry" (#78, fixed) |
 | 2026-10-10 | minor | Noted that no gap blocks alpha (core-workflow gate passes) |
 | 2026-10-10 | major | Created: every gap from the 2026-10-10 re-measure and the 16 open GitHub issues, ranked, with beta blockers marked |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index 5c7c50b9..8fe5e08d 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -48,7 +48,7 @@ AGENTS.md §2). Dimension score: **~60% ready** (estimated), **30–50 h** to pa
 | Connector glue and rerouting | yes | yes |
 | Edit points on freeforms | yes | **no** |
 | Crop handles, crop to shape, aspect ratio | yes | partial |
-| Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
+| Text caret, selection, double/triple click, drag-select | yes | yes |
 | Exact size/position, lock aspect | yes | yes |
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
@@ -87,4 +87,5 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Tab in text boxes keeps editing (#78) |
 | 2026-10-10 | major | Created: shell, panes and dialogs, direct manipulation, shortcuts and visual fidelity against PowerPoint 16.113 |

From 208c16364782cd83a19f08f095d0138ed1065422 Mon Sep 17 00:00:00 2001
From: Alexander Alber <90604107+alexanderalber@users.noreply.github.com>
Date: Sun, 11 Oct 2026 09:55:36 +0200
Subject: [PATCH 015/376] Slide show: media set to play in the click sequence
 starts on Next (#116)

PPTX import already read PowerPoint's media effects (presetClass
mediacall: Play, Pause, Stop) into the timeline, but the show never
carried them out: media started only with autoplay or a click on it.
The show now sets off a step's media effects as the step reaches them,
and also when a click cuts the step short.

A step also no longer lasts as long as the media it starts: the video
plays on by itself and the next click goes on at once. An After Previous
effect behind it still waits for the media to end.

generated with Claude Code
---
 crates/anim/src/tests.rs    |  17 ++++++
 crates/anim/src/timeline.rs |  18 ++++++-
 crates/ui-egui/src/show.rs  | 102 ++++++++++++++++++++++++++++++++++--
 docs/slideshow-parity.md    |   3 +-
 4 files changed, 135 insertions(+), 5 deletions(-)

diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..48544b7c 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -789,3 +789,20 @@ fn show_follows_links() {
     assert_eq!(s.follow(&p, &Action::LastViewed, None), LinkJump::None);
     assert_eq!(s.slide, 3);
 }
+
+#[test]
+fn media_in_the_click_sequence_cues_and_does_not_hold_the_click() {
+    // #116: a video set to play in the click sequence starts with its step, and the step doesn't
+    // last as long as the video (the next click goes on while it plays).
+    let play = Animation { duration_ms: 5000, ..anim(1, AnimClass::Media, "play", AnimStart::OnClick) };
+    let tl = Timeline::new(&slide_with(vec![play.clone(), anim(2, AnimClass::Exit, "fadeOut", AnimStart::OnClick)]), W, H);
+    assert_eq!(tl.steps(), 2);
+    assert_eq!(tl.step_duration(0), 0.0);
+    let cues = tl.media_cues(0, f64::NEG_INFINITY, 0.0);
+    assert_eq!(cues.iter().map(|e| (e.shape, e.anim)).collect::<Vec<_>>(), [(ShapeId(1), 0)]);
+    assert!(tl.media_cues(0, 0.0, f64::INFINITY).is_empty(), "set off once");
+    assert!(tl.media_cues(1, f64::NEG_INFINITY, f64::INFINITY).is_empty(), "only media effects");
+    // An After Previous effect still waits for the video.
+    let tl = Timeline::new(&slide_with(vec![play, anim(2, AnimClass::Entrance, "fade", AnimStart::AfterPrevious)]), W, H);
+    assert!((tl.step_duration(0) - 6.0).abs() < 1e-9, "{}", tl.step_duration(0));
+}
diff --git a/crates/anim/src/timeline.rs b/crates/anim/src/timeline.rs
index e73acfd9..cc477904 100644
--- a/crates/anim/src/timeline.rs
+++ b/crates/anim/src/timeline.rs
@@ -249,7 +249,9 @@ impl Timeline {
                     max_end = max_end.max(end);
                     let step = steps.len().saturating_sub(1);
                     if let Some(s) = steps.last_mut() {
-                        s.duration = s.duration.max(end);
+                        // Media plays on by itself once started: it holds back an After Previous
+                        // effect (`max_end`), but not the next click (#116).
+                        s.duration = s.duration.max(if a.class == AnimClass::Media { start } else { end });
                     }
                     tl.effects.push(Effect {
                         timing: EffectTiming {
@@ -308,6 +310,20 @@ impl Timeline {
         self.main.get(i).map(|s| s.duration).unwrap_or(0.0)
     }
 
+    /// Media effects (Play, Pause, Stop) of main step `step` that start after `from` and by `to`
+    /// seconds into it, in order: what a show running the step from `from` to `to` sets off.
+    pub fn media_cues(&self, step: usize, from: f64, to: f64) -> Vec<EffectTiming> {
+        let mut v: Vec<EffectTiming> = self
+            .effects
+            .iter()
+            .map(|e| &e.timing)
+            .filter(|e| e.class == AnimClass::Media && e.sequence == Sequence::Main && e.step == step && e.start > from && e.start <= to)
+            .cloned()
+            .collect();
+        v.sort_by(|a, b| a.start.total_cmp(&b.start));
+        v
+    }
+
     /// Total duration of the main sequence played without pauses.
     pub fn total_duration(&self) -> f64 {
         self.main.iter().map(|s| s.duration).sum()
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 1c8e6e1e..826b30c2 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -42,6 +42,10 @@ pub struct Show {
     last_viewed: Option<usize>,
     /// Click areas of hyperlinks and shape actions on slide `.0`, in slide points.
     links: Option<(usize, Vec<deckcraft_render::PlacedLink>)>,
+    /// The main step whose media effects are being set off, and how far into it they have been.
+    media_clock: Option<(usize, f64)>,
+    /// Media effects set off and not yet carried out: (shape, effect id).
+    media_cues: Vec<(ShapeId, String)>,
 }
 
 #[derive(Clone, PartialEq)]
@@ -95,6 +99,8 @@ impl Show {
             media_slide: None,
             last_viewed: None,
             links: None,
+            media_clock: None,
+            media_cues: vec![],
         }
     }
 
@@ -114,10 +120,17 @@ impl Show {
 
     fn apply(&mut self, a: ShowAction, doc: &Presentation, now: f64) -> bool {
         match a {
-            ShowAction::PlayStep(_) => {
+            ShowAction::PlayStep(k) => {
                 self.step_start = now;
+                self.media_clock = Some((k, f64::NEG_INFINITY));
             }
-            ShowAction::FinishStep(_) | ShowAction::StepBack(_) => {
+            ShowAction::FinishStep(n) => {
+                // A step cut short by a click still sets off the media it holds.
+                self.cue_media(doc, n, f64::INFINITY);
+                self.step_end = now;
+            }
+            ShowAction::StepBack(_) => {
+                self.media_clock = None;
                 self.step_end = now;
             }
             ShowAction::Slide(i) => {
@@ -145,6 +158,7 @@ impl Show {
                 self.slide_start = now;
                 self.step_start = now;
                 self.step_end = now;
+                self.media_clock = None;
                 self.strokes.clear();
                 if self.preview_only {
                     return false;
@@ -168,11 +182,28 @@ impl Show {
         let auto = self.timeline(doc).step_is_auto(0);
         if auto || self.autoplay {
             let a = self.state.next(doc);
-            if matches!(a, ShowAction::PlayStep(_)) {
+            if let ShowAction::PlayStep(k) = a {
                 self.step_start = now;
+                self.media_clock = Some((k, f64::NEG_INFINITY));
             }
         }
     }
+
+    /// Queue the media effects (Play, Pause, Stop) of main step `step` that the show reached since
+    /// the last call, up to `t` seconds into the step (#116).
+    fn cue_media(&mut self, doc: &Presentation, step: usize, t: f64) {
+        let Some((k, from)) = self.media_clock else { return };
+        if k != step {
+            self.media_clock = None;
+            return;
+        }
+        let slide = self.state.slide;
+        let cues = self.timeline(doc).media_cues(step, from, t);
+        let effects: Vec<(ShapeId, String)> =
+            cues.iter().filter_map(|e| doc.slides.get(slide).and_then(|s| s.animations.get(e.anim)).map(|a| (e.shape, a.effect.clone()))).collect();
+        self.media_cues.extend(effects);
+        self.media_clock = if t.is_finite() { Some((k, t)) } else { None };
+    }
 }
 
 fn state_for(tl: &Timeline, id: ShapeId, step: usize, t: f64) -> ShapeState {
@@ -352,7 +383,12 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             keep = false;
         }
     }
+    if show.state.playing {
+        let step = show.state.step;
+        show.cue_media(&doc, step, now - show.step_start);
+    }
     show_media(app, &mut show, &doc);
+    run_media_cues(app, &mut show, &doc);
     // Draw.
     let full = ui.max_rect();
     let painter = ui.painter_at(full);
@@ -670,6 +706,21 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
     }
 }
 
+/// Carry out the media effects the show's steps set off: Play starts from the beginning unless
+/// the clip is already playing, Pause toggles, Stop stops.
+fn run_media_cues(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
+    for (id, effect) in std::mem::take(&mut show.media_cues) {
+        let Some(clip) = crate::media::find_clip(doc, id) else { continue };
+        match effect.as_str() {
+            "pause" => app.media.toggle(doc, id, &clip, crate::media::Owner::Show),
+            "stop" => app.media.stop(id),
+            // Already playing (it also starts automatically): leave it running.
+            _ if app.media.is_playing(id) => {}
+            _ => app.media.play(doc, id, &clip, Some(0.0), crate::media::Owner::Show),
+        }
+    }
+}
+
 /// The media shape under the pointer on the shown slide.
 fn media_hit(ctx: &egui::Context, ui: &Ui, show: &Show, doc: &Presentation) -> Option<(ShapeId, deckcraft_model::MediaClip)> {
     let p = ctx.input(|i| i.pointer.interact_pos())?;
@@ -843,4 +894,49 @@ mod tests {
         assert_eq!(tr.from, Some(0));
         assert!(show.tex.is_none(), "the new slide gets a texture of its own instead of overwriting the old one");
     }
+
+    #[test]
+    fn media_in_the_click_sequence_plays_with_its_step() {
+        // #116: media set to play in the click sequence never started; only a click on it did.
+        let s = deckcraft_engine::Session::with_new();
+        let mut doc = s.active().unwrap().doc.clone();
+        let id = doc.slides[0].shapes[0].id;
+        let play = |delay_ms| deckcraft_model::Animation {
+            shape: id,
+            class: deckcraft_model::AnimClass::Media,
+            effect: "play".into(),
+            duration_ms: 5000,
+            delay_ms,
+            ..Default::default()
+        };
+        std::sync::Arc::make_mut(&mut std::sync::Arc::make_mut(&mut doc).slides[0]).animations = vec![play(0), play(2000)];
+        let mut show = Show::new(&doc, 0, false, false);
+        assert!(show.apply(ShowAction::Slide(0), &doc, 0.0));
+        // Next: the first step plays and sets off its Play once.
+        let a = show.state.next(&doc);
+        assert_eq!(a, ShowAction::PlayStep(0));
+        assert!(show.apply(a, &doc, 1.0));
+        show.cue_media(&doc, 0, 0.0);
+        show.cue_media(&doc, 0, 0.5);
+        assert_eq!(std::mem::take(&mut show.media_cues), [(id, "play".to_string())]);
+        // The step doesn't wait for the video: the step clock ends it at once.
+        assert_eq!(show.timeline(&doc).step_duration(0), 0.0);
+        let a = show.state.step_done(&doc);
+        assert!(show.apply(a, &doc, 1.0));
+        assert!(show.media_cues.is_empty(), "set off once");
+        // Next again, before the second Play's delay: cutting the step short still sets it off.
+        let a = show.state.next(&doc);
+        assert_eq!(a, ShowAction::PlayStep(1));
+        assert!(show.apply(a, &doc, 2.0));
+        show.cue_media(&doc, 1, 0.5);
+        assert!(show.media_cues.is_empty());
+        let a = show.state.step_done(&doc);
+        assert!(show.apply(a, &doc, 2.6));
+        assert_eq!(std::mem::take(&mut show.media_cues), [(id, "play".to_string())]);
+        // Going back doesn't set anything off.
+        let a = show.state.prev(&doc);
+        assert!(show.apply(a, &doc, 3.0));
+        show.cue_media(&doc, 1, 9.0);
+        assert!(show.media_cues.is_empty());
+    }
 }
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index fd981595..3eae40ea 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -20,7 +20,7 @@ ready** (estimated), **10–16 h** to parity.
 | Step clock: a click after a long pause plays its step (#11) | yes | yes | |
 | Hidden slides skipped | yes | yes | |
 | Hyperlinks and action settings followed (slides, web, mail, End Show, Last Viewed) | yes | yes | Only `http(s)` and `mailto` open outside the show, by design (`safe_url`) |
-| Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable |
+| Media playback with controls, play across slides, full-screen video, Play/Pause/Stop in the click sequence | yes | yes | WMA/WMV not decodable; click sequence since #116 |
 | Animated GIFs play; pause from their corner button | yes | yes (#39) | |
 | See All Slides grid during the show | yes | no | |
 | Zoom into part of a slide during the show | yes | no | |
@@ -73,4 +73,5 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Media effects (Play, Pause, Stop) in the click sequence play with their step (#116) |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |

From 5ac52239465ee4395cada775c13eb71a16d0794d Mon Sep 17 00:00:00 2001
From: Alexander Alber <90604107+alexanderalber@users.noreply.github.com>
Date: Sun, 11 Oct 2026 13:40:58 +0200
Subject: [PATCH 016/376] PPTX import: a transition without spd is 0.5 s, not
 the effect's default (#117)

PowerPoint 2021/2024 write a 0.5 s transition with neither spd nor
p14:dur, since "fast" is the schema default for spd. The reader fell back
to the effect's own default instead (Morph 2 s, Fade 0.7 s, most 1 s).

generated with Claude Code
---
 crates/pptx/src/read/timing.rs      |  4 +-
 crates/pptx/tests/transition_xml.rs | 72 +++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+), 2 deletions(-)
 create mode 100644 crates/pptx/tests/transition_xml.rs

diff --git a/crates/pptx/src/read/timing.rs b/crates/pptx/src/read/timing.rs
index 500bb485..def0b0eb 100644
--- a/crates/pptx/src/read/timing.rs
+++ b/crates/pptx/src/read/timing.rs
@@ -33,11 +33,11 @@ pub fn transition(imp: &mut Imp, part: &Part, t: &El) -> Option<Transition> {
         },
     }
     let default_dur = deckcraft_model::anim::TRANSITIONS.iter().find(|x| x.0 == tr.kind).map(|x| x.3).unwrap_or(1000);
+    // `spd` defaults to "fast" in the schema; PowerPoint omits both attributes for 0.5 s.
     tr.duration_ms = ms_attr(t, "dur").unwrap_or(match t.attr("spd") {
-        Some("fast") => 500,
         Some("med") => 750,
         Some("slow") => default_dur.max(1000),
-        _ => default_dur,
+        _ => 500,
     });
     if let Some(snd) = t.path(&["sndAc", "stSnd", "snd"]) {
         tr.sound = dml::media_ref(imp, part, snd);
diff --git a/crates/pptx/tests/transition_xml.rs b/crates/pptx/tests/transition_xml.rs
new file mode 100644
index 00000000..ffa5bcf4
--- /dev/null
+++ b/crates/pptx/tests/transition_xml.rs
@@ -0,0 +1,72 @@
+//! Transition XML as other applications write it, spliced into an exported deck and read back.
+
+use std::io::{Cursor, Read, Write};
+
+use deckcraft_model::anim::Transition;
+use deckcraft_model::defaults;
+
+const P159: &str = "http://schemas.microsoft.com/office/powerpoint/2015/09/main";
+const P14: &str = "http://schemas.microsoft.com/office/powerpoint/2010/main";
+
+/// Exports a one-slide deck, replaces the slide's `mc:AlternateContent` transition block with
+/// `xml` and returns the imported transition of that slide.
+fn import_with(xml: &str) -> Transition {
+    let mut p = defaults::new_presentation(None);
+    std::sync::Arc::make_mut(&mut p.slides[0]).transition = Some(Transition { kind: "fade".into(), duration_ms: 3000, ..Default::default() });
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut z = zip::ZipArchive::new(Cursor::new(&bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let o = zip::write::SimpleFileOptions::default();
+    for i in 0..z.len() {
+        let mut f = z.by_index(i).expect("entry");
+        let mut d = vec![];
+        f.read_to_end(&mut d).expect("read");
+        if f.name() == "ppt/slides/slide1.xml" {
+            let s = String::from_utf8(d).expect("utf8");
+            let t = s.find("<p:transition").expect("transition");
+            let a = s[..t].rfind("<mc:AlternateContent").expect("mc start");
+            let end = "</mc:AlternateContent>";
+            let b = t + s[t..].find(end).expect("mc end") + end.len();
+            d = format!("{}{xml}{}", &s[..a], &s[b..]).into_bytes();
+        }
+        out.start_file(f.name(), o).expect("start");
+        out.write_all(&d).expect("write");
+    }
+    let bytes = out.finish().expect("finish").into_inner();
+    let q = deckcraft_pptx::import(&bytes).expect("import");
+    q.slides[0].transition.clone().expect("transition")
+}
+
+fn mc(choice_ns: &str, req: &str, choice: &str, fallback: &str) -> String {
+    format!(
+        r#"<mc:AlternateContent xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"><mc:Choice xmlns:{req}="{choice_ns}" Requires="{req}">{choice}</mc:Choice><mc:Fallback>{fallback}</mc:Fallback></mc:AlternateContent>"#
+    )
+}
+
+/// PowerPoint 2021/2024 write a 0.5 s Morph with neither `spd` nor `p14:dur` (issue #117).
+#[test]
+fn powerpoint_half_second_morph_without_spd() {
+    let xml = mc(P159, "p159", r#"<p:transition><p159:morph option="byObject"/></p:transition>"#, "<p:transition><p:fade/></p:transition>");
+    let t = import_with(&xml);
+    assert_eq!((t.kind.as_str(), t.duration_ms), ("morph", 500));
+}
+
+#[test]
+fn missing_spd_is_fast_for_a_plain_transition() {
+    let t = import_with("<p:transition><p:fade/></p:transition>");
+    assert_eq!((t.kind.as_str(), t.duration_ms), ("fade", 500));
+}
+
+#[test]
+fn spd_and_dur_still_apply() {
+    let t = import_with(r#"<p:transition spd="med"><p:fade/></p:transition>"#);
+    assert_eq!(t.duration_ms, 750);
+    let xml = mc(
+        P159,
+        "p159",
+        &format!(r#"<p:transition xmlns:p14="{P14}" spd="slow" p14:dur="1250"><p159:morph option="byObject"/></p:transition>"#),
+        r#"<p:transition spd="slow"><p:fade/></p:transition>"#,
+    );
+    let t = import_with(&xml);
+    assert_eq!((t.kind.as_str(), t.duration_ms), ("morph", 1250));
+}

From 44ddb579dad100c348119c4729e3c337182b633d Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sun, 11 Oct 2026 13:51:58 +0200
Subject: [PATCH 017/376] Charts: a single-series chart without an explicit
 title shows the series name as its automatic title (#142)

---
 crates/pptx/src/read/chart.rs | 38 +++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index a9a960a3..b93378bb 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -202,6 +202,10 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
             c.series.push(ser);
         }
     }
+    // `autoTitleDeleted val="0"` without `c:title`: PowerPoint and LibreOffice draw the series name as the title of a single-series chart.
+    if ch.child("title").is_none() && ch.child("autoTitleDeleted").and_then(|a| a.bool("val")) == Some(false) && c.series.len() == 1 {
+        c.title = c.series.first().map(|s| s.name.clone()).filter(|n| !n.is_empty());
+    }
     let first = *kinds.first()?;
     c.kind = if kinds.iter().any(|k| *k != first) { ChartType::Combo } else { first };
     if c.kind != ChartType::Combo {
@@ -225,3 +229,37 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
     }
     Some(c)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const NS_C: &str = "http://schemas.openxmlformats.org/drawingml/2006/chart";
+    const NS_A: &str = "http://schemas.openxmlformats.org/drawingml/2006/main";
+
+    fn chart(auto_deleted: &str, title: &str, series: usize) -> Chart {
+        let val = r#"<c:val><c:numLit><c:ptCount val="1"/><c:pt idx="0"><c:v>1</c:v></c:pt></c:numLit></c:val>"#;
+        let ser: String = (0..series).map(|i| format!(r#"<c:ser><c:idx val="{i}"/><c:tx><c:v>S{i}</c:v></c:tx>{val}</c:ser>"#)).collect();
+        let plot = format!(r#"<c:plotArea><c:barChart><c:barDir val="col"/>{ser}</c:barChart></c:plotArea>"#);
+        let xml = format!(r#"<c:chartSpace xmlns:c="{NS_C}" xmlns:a="{NS_A}"><c:chart>{title}{auto_deleted}{plot}</c:chart></c:chartSpace>"#);
+        read_chart_xml(xml.as_bytes()).unwrap()
+    }
+
+    #[test]
+    fn single_series_gets_automatic_title() {
+        assert_eq!(chart(r#"<c:autoTitleDeleted val="0"/>"#, "", 1).title.as_deref(), Some("S0"));
+    }
+
+    #[test]
+    fn no_automatic_title_when_deleted_or_multi_series() {
+        assert_eq!(chart(r#"<c:autoTitleDeleted val="1"/>"#, "", 1).title, None);
+        assert_eq!(chart("", "", 1).title, None);
+        assert_eq!(chart(r#"<c:autoTitleDeleted val="0"/>"#, "", 2).title, None);
+    }
+
+    #[test]
+    fn explicit_title_wins() {
+        let t = "<c:title><c:tx><c:rich><a:p><a:r><a:t>Mine</a:t></a:r></a:p></c:rich></c:tx></c:title>";
+        assert_eq!(chart(r#"<c:autoTitleDeleted val="0"/>"#, t, 1).title.as_deref(), Some("Mine"));
+    }
+}

From 1c8992fdbe2680e64edc90571771e22346a73d0c Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sun, 11 Oct 2026 13:52:32 +0200
Subject: [PATCH 018/376] Charts: a missing varyColors varies single-series bar
 colours by point (#143)

---
 crates/pptx/src/read/chart.rs | 29 ++++++++++++++++++++++++++---
 crates/render/src/chart.rs    | 14 +++++++++++++-
 crates/render/src/tests.rs    | 17 +++++++++++++++++
 3 files changed, 56 insertions(+), 4 deletions(-)

diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index a9a960a3..e8239ce2 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -150,9 +150,8 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
             "surfaceChart" | "surface3DChart" => ChartType::Surface,
             _ => continue,
         };
-        if let Some(v) = g.child_val("varyColors") {
-            c.vary_colors = v == "1" || v == "true";
-        }
+        // A missing <c:varyColors> means "vary by point" (the schema default is true), as PowerPoint draws it.
+        c.vary_colors = g.child_val("varyColors").is_none_or(|v| v == "1" || v == "true");
         if let Some(v) = g.child_val("gapWidth").and_then(|v| v.parse::<f64>().ok()) {
             c.gap_width = (v / 100.0).clamp(0.0, 5.0);
         }
@@ -225,3 +224,27 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
     }
     Some(c)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::read_chart_xml;
+
+    const NS: &str = "http://schemas.openxmlformats.org/drawingml/2006/chart";
+
+    fn xml(vary: &str) -> String {
+        let ser = r#"<c:ser><c:idx val="0"/><c:order val="0"/></c:ser>"#;
+        let bar = format!(r#"<c:barChart><c:barDir val="col"/><c:grouping val="clustered"/>{vary}{ser}</c:barChart>"#);
+        format!(r#"<c:chartSpace xmlns:c="{NS}"><c:chart><c:plotArea>{bar}</c:plotArea></c:chart></c:chartSpace>"#)
+    }
+
+    #[test]
+    fn missing_vary_colors_means_vary_by_point() {
+        assert!(read_chart_xml(xml("").as_bytes()).is_some_and(|c| c.vary_colors));
+    }
+
+    #[test]
+    fn explicit_vary_colors_is_respected() {
+        assert!(read_chart_xml(xml(r#"<c:varyColors val="0"/>"#).as_bytes()).is_some_and(|c| !c.vary_colors));
+        assert!(read_chart_xml(xml(r#"<c:varyColors val="1"/>"#).as_bytes()).is_some_and(|c| c.vary_colors));
+    }
+}
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index a29b2023..ced1f77a 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -36,6 +36,18 @@ fn series_fill(ctx: &Ctx, c: &Chart, i: usize, s: Option<&deckcraft_model::chart
     }
 }
 
+/// Fill of one bar: a `<c:dPt>` fill wins, and a single-series chart that varies colours by point uses one accent per point
+/// (not waterfalls, which are never read from a `<c:barChart>`).
+fn bar_fill(ctx: &Ctx, c: &Chart, si: usize, pi: usize, s: &deckcraft_model::chart::Series) -> Rgba {
+    if let Some((_, Fill::Solid { color: cc })) = s.point_fills.iter().find(|(k, _)| *k == pi) {
+        return ctx.color(cc, None);
+    }
+    if c.vary_colors && c.series.len() == 1 && s.fill.is_none() && c.kind != ChartType::Waterfall {
+        return series_color(ctx, c, pi);
+    }
+    series_fill(ctx, c, si, Some(s))
+}
+
 fn label(ctx: &mut RenderContext, rctx: &Ctx, m: Affine, text: &str, r: Rect, size: f64, align: Align, anchor: Anchor, col: Rgba, bold: bool) {
     let mut body = TextBody::from_text(text);
     body.body.inset_l = Some(0.0);
@@ -291,7 +303,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                     Rect::new(plot.x0 + start, to_v(b), plot.x0 + start + bar, to_v(a))
                 };
                 ctx.set_transform(m);
-                ctx.set_paint(color(series_fill(rctx, c, si, Some(s)), 1.0));
+                ctx.set_paint(color(bar_fill(rctx, c, si, i, s), 1.0));
                 ctx.fill_rect(&r.abs());
                 if c.data_labels {
                     let t = fmt_num(s.values.get(i).copied().flatten().unwrap_or(0.0));
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index ccb4472f..7e60e75d 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -523,3 +523,20 @@ fn hyperlinks_draw_in_the_hyperlink_colour_underlined() {
     let own = px(&run_deck(RunProps { link, fill: red.clone(), ..Default::default() }));
     assert_eq!(diff(&own, &px(&run_deck(RunProps { fill: red, underline: Some("sng".into()), ..Default::default() }))), 0);
 }
+
+#[test]
+fn single_series_column_chart_varies_colours_by_point() {
+    let render = |vary: bool| {
+        let mut c = Chart::sample(ChartType::Column);
+        c.series.truncate(1);
+        c.vary_colors = vary;
+        let sh = Shape {
+            id: ShapeId(800),
+            xfrm: Some(Xfrm::new(50.0, 50.0, 400.0, 300.0)),
+            kind: ShapeKind::Chart(Box::new(c)),
+            ..Default::default()
+        };
+        render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() }).pixels
+    };
+    assert_ne!(render(true), render(false));
+}

From e999424c797214a0d5abdfcc08c3ee417bf8f110 Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@stackworx.io>
Date: Sun, 11 Oct 2026 16:57:53 +0200
Subject: [PATCH 019/376] Issue #106: zooming keeps the point under the pointer

Ctrl/Cmd + wheel and pinch changed the zoom but left the scroll offset
alone, so the slide grew from the canvas corner (from its top-left once it
was larger than the window) and the spot under the pointer slid away. The
pointer position was read but never used. Zoom In/Out, the status-bar
slider and the Zoom dialog had the same effect.

The canvas now remembers last frame's slide rect and scale. When the scale
changes it sets the offset so the slide point under the anchor stays put:
the pointer for wheel and pinch zoom, the middle of the canvas for the
commands. Once the slide fits the window it is centred as before. Wheel
and pinch zoom take effect in the same frame instead of the next.

Fixes #106

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/canvas.rs | 128 ++++++++++++++++++++++++++++++++---
 1 file changed, 118 insertions(+), 10 deletions(-)

diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index d267f76c..f77738ca 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -62,19 +62,31 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
         }
         return;
     }
-    let (content_rect, scale) = layout(app, avail);
     // Scroll when zoomed beyond the window.
     let scroll_id = ui.id().with("canvas_scroll");
+    let last_id = scroll_id.with("last");
     let mut offset: egui::Vec2 = ui.data_mut(|d| d.get_temp(scroll_id).unwrap_or_default());
-    let overflow = vec2((content_rect.width() + 56.0 - avail.width()).max(0.0), (content_rect.height() + 56.0 - avail.height()).max(0.0));
+    let last: Option<(Rect, f32)> = ui.data_mut(|d| d.get_temp(last_id));
     let resp = ui.allocate_rect(avail, Sense::click_and_drag());
-    let (wheel, zoom_delta, pinch_pos) = ui.input(|i| (i.smooth_scroll_delta, i.zoom_delta(), i.pointer.hover_pos()));
-    if resp.hovered() {
-        if (zoom_delta - 1.0).abs() > 1e-3 {
-            let cur = app.ui.zoom.unwrap_or(scale);
-            app.ui.zoom = Some((cur * zoom_delta).clamp(0.1, 4.0));
-            let _ = pinch_pos;
-        } else if overflow != egui::Vec2::ZERO {
+    let (wheel, zoom_delta, hover) = ui.input(|i| (i.smooth_scroll_delta, i.zoom_delta(), i.pointer.hover_pos()));
+    let zooming = resp.hovered() && (zoom_delta - 1.0).abs() > 1e-3;
+    if zooming {
+        let cur = app.ui.zoom.unwrap_or_else(|| layout(app, avail).1);
+        app.ui.zoom = Some((cur * zoom_delta).clamp(0.1, 4.0));
+    }
+    let (content_rect, scale) = layout(app, avail);
+    // A new zoom keeps the slide point under the pointer (wheel, pinch) or under the middle of the
+    // canvas (Zoom In/Out, the slider) where it was, instead of growing from the corner (#106).
+    if let Some((last_rect, last_scale)) = last
+        && (scale - last_scale).abs() > 1e-6
+    {
+        let anchor = if zooming { hover.unwrap_or(avail.center()) } else { avail.center() };
+        let at = (anchor - last_rect.min) / last_scale;
+        offset = content_rect.min + at * scale - anchor;
+    }
+    let overflow = vec2((content_rect.width() + 56.0 - avail.width()).max(0.0), (content_rect.height() + 56.0 - avail.height()).max(0.0));
+    if resp.hovered() && !zooming {
+        if overflow != egui::Vec2::ZERO {
             offset -= wheel;
         } else if wheel.y.abs() > 18.0 && app.session.tool.marquee.is_none() && !app.session.tool.dragging() {
             // Wheel over a fitted slide pages through slides (like PowerPoint).
@@ -90,8 +102,11 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     }
     offset.x = offset.x.clamp(0.0, overflow.x);
     offset.y = offset.y.clamp(0.0, overflow.y);
-    ui.data_mut(|d| d.insert_temp(scroll_id, offset));
     let slide_rect = content_rect.translate(-offset);
+    ui.data_mut(|d| {
+        d.insert_temp(scroll_id, offset);
+        d.insert_temp(last_id, (slide_rect, scale));
+    });
     app.slide_rect = Some(slide_rect);
     app.canvas_scale = scale;
     let xf = Xf { origin: slide_rect.min, scale };
@@ -608,3 +623,96 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
         }
     });
 }
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used)]
+
+    use deckcraft_engine::Session;
+    use egui::{Event, Modifiers, MouseWheelUnit, Pos2, TouchPhase, pos2, vec2};
+    use egui_kittest::Harness;
+
+    use crate::{Services, SlideApp};
+
+    fn harness() -> Harness<'static, SlideApp> {
+        let mut h = Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        h.run_steps(3);
+        h
+    }
+
+    /// The slide point (in slide points) under screen position `p`.
+    fn slide_point(h: &Harness<'_, SlideApp>, p: Pos2) -> Pos2 {
+        let (r, s) = (h.state().slide_rect.unwrap(), h.state().canvas_scale);
+        pos2((p.x - r.min.x) / s, (p.y - r.min.y) / s)
+    }
+
+    fn ctrl_wheel(h: &mut Harness<'_, SlideApp>, lines: f32) {
+        let wheel = Event::MouseWheel { unit: MouseWheelUnit::Line, delta: vec2(0.0, lines), phase: TouchPhase::Move, modifiers: Modifiers::COMMAND };
+        h.event(wheel);
+        // egui spreads a wheel notch over several frames.
+        h.run_steps(30);
+    }
+
+    fn assert_near(a: Pos2, b: Pos2, what: &str) {
+        assert!((a - b).length() < 0.5, "{what}: {a:?} moved to {b:?}");
+    }
+
+    /// #106: wheel and pinch zoom zoomed toward the slide's corner instead of the pointer.
+    #[test]
+    fn wheel_and_pinch_zoom_keep_the_point_under_the_pointer() {
+        let mut h = harness();
+        let fit = h.state().canvas_scale;
+        let r = h.state().slide_rect.unwrap();
+        let p = r.min + vec2(r.width() * 0.8, r.height() * 0.7);
+        h.event(Event::PointerMoved(p));
+        h.run_steps(1);
+        let under = slide_point(&h, p);
+
+        h.event(Event::Zoom(2.0));
+        h.run_steps(2);
+        assert!((h.state().canvas_scale - fit * 2.0).abs() < 1e-3);
+        assert_near(under, slide_point(&h, p), "pinch in");
+
+        ctrl_wheel(&mut h, 1.0);
+        assert!(h.state().canvas_scale > fit * 2.1, "Ctrl/Cmd + wheel up zooms in");
+        assert_near(under, slide_point(&h, p), "wheel in");
+
+        ctrl_wheel(&mut h, -1.0);
+        ctrl_wheel(&mut h, -1.0);
+        assert!(h.state().canvas_scale < fit * 2.0, "Ctrl/Cmd + wheel down zooms out");
+        assert_near(under, slide_point(&h, p), "wheel out");
+
+        h.event(Event::Zoom(0.8));
+        h.run_steps(2);
+        assert_near(under, slide_point(&h, p), "pinch out");
+
+        // Zoomed out below the window size, the slide is centred again.
+        h.event(Event::Zoom(0.25));
+        h.run_steps(2);
+        assert!(h.state().canvas_scale < fit);
+        let (canvas, slide) = (h.state().canvas_rect.unwrap(), h.state().slide_rect.unwrap());
+        assert!((canvas.center() - slide.center()).length() < 1.0, "{canvas:?} {slide:?}");
+    }
+
+    /// Zoom In/Out (keys, buttons, slider) keeps the middle of the view where it is.
+    #[test]
+    fn zoom_commands_keep_the_middle_of_the_view() {
+        let mut h = harness();
+        let c = h.state().canvas_rect.unwrap().center();
+        let mid = slide_point(&h, c);
+        for _ in 0..4 {
+            h.state_mut().run("view.zoomIn", serde_json::json!({})).unwrap();
+            h.run_steps(2);
+            assert_near(mid, slide_point(&h, c), "zoom in");
+        }
+        h.state_mut().run("view.zoomOut", serde_json::json!({})).unwrap();
+        h.run_steps(2);
+        assert_near(mid, slide_point(&h, c), "zoom out");
+    }
+}

From 6a91164a5b01e5d92669df4d37e36f61adcf53c1 Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@stackworx.io>
Date: Sun, 11 Oct 2026 17:05:17 +0200
Subject: [PATCH 020/376] Issue #144: automatic value axes scale like Office

The value axis used a generic "nice" scale: about five intervals and no
headroom, so data with a maximum of 42.1 got 0-50 in steps of 10, while
PowerPoint and LibreOffice draw 0-45 in steps of 5.

`auto_scale` now follows the rule Office documents for automatic limits:
the maximum is the first major unit at or above max + (max - min)/20, the
minimum is zero when all values are positive and the smallest is below 5/6
of the largest (otherwise the first major unit at or below min - the same
headroom), and all-negative data mirrors that. The major unit is the
smallest 1, 2 or 5 x 10^n that gives at most 10 intervals. Fixed
`<c:min>`/`<c:max>` limits are kept as they are and no longer get rounded
or padded; values beyond them stop at the plot edge. 100% charts get
0-1 in steps of 0.1.

Fixes #144

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/model/src/chart.rs  | 184 ++++++++++++++++++++++++++++---------
 crates/render/src/chart.rs |  11 ++-
 2 files changed, 147 insertions(+), 48 deletions(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index 5ba72fc4..0ce14b41 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -210,60 +210,99 @@ impl Chart {
         c.vary_colors = n_series == 1;
         c
     }
-    /// Value range across series (stacked sums for stacked types).
+    /// The value axis scale `(min, max, major unit)` the chart is drawn with: the chart's fixed
+    /// limits, otherwise Office's automatic scale ([`auto_scale`]).
+    pub fn axis_scale(&self) -> (f64, f64, f64) {
+        if self.kind.percent() {
+            return auto_scale(0.0, 1.0, Some(0.0), Some(1.0));
+        }
+        let (lo, hi) = self.value_range();
+        auto_scale(lo, hi, self.y_min, self.y_max)
+    }
+
+    /// Range of the plotted values (stacked sums for stacked types, which start at zero);
+    /// `(0, 0)` without values.
     pub fn value_range(&self) -> (f64, f64) {
-        let mut lo: f64 = 0.0;
-        let mut hi: f64 = 0.0;
         let n = self.categories.len().max(self.series.iter().map(|s| s.values.len()).max().unwrap_or(0));
         if self.kind.stacked() {
+            let (mut lo, mut hi) = (0.0f64, 0.0f64);
             for i in 0..n {
                 let (mut p, mut m) = (0.0, 0.0);
                 for s in &self.series {
-                    let v = s.values.get(i).copied().flatten().unwrap_or(0.0);
+                    let v = s.values.get(i).copied().flatten().filter(|v| v.is_finite()).unwrap_or(0.0);
                     if v >= 0.0 { p += v } else { m += v }
                 }
                 hi = hi.max(p);
                 lo = lo.min(m);
             }
-        } else {
-            for s in &self.series {
-                for v in s.values.iter().flatten() {
-                    if v.is_finite() {
-                        hi = hi.max(*v);
-                        lo = lo.min(*v);
-                    }
-                }
-            }
+            return (lo, hi);
         }
-        if self.kind.percent() {
-            return (0.0, 1.0);
-        }
-        (self.y_min.unwrap_or(lo), self.y_max.unwrap_or(hi))
+        let mut values = self.series.iter().flat_map(|s| s.values.iter().flatten()).filter(|v| v.is_finite());
+        let Some(first) = values.next() else { return (0.0, 0.0) };
+        values.fold((*first, *first), |(lo, hi), v| (lo.min(*v), hi.max(*v)))
     }
 }
 
-/// "Nice" axis scale: (min, max, major step) covering [lo, hi].
-pub fn nice_scale(lo: f64, hi: f64) -> (f64, f64, f64) {
-    let (lo, hi) = if lo.is_finite() && hi.is_finite() { (lo.min(hi), lo.max(hi)) } else { (0.0, 1.0) };
-    let span = if hi - lo < 1e-12 { hi.abs().max(1.0) } else { hi - lo };
-    let raw = span / 5.0;
-    let mag = 10f64.powf(raw.log10().floor());
-    let norm = raw / mag;
-    let step = if norm <= 1.0 {
-        1.0
-    } else if norm <= 2.0 {
-        2.0
-    } else if norm <= 2.5 {
-        2.5
-    } else if norm <= 5.0 {
-        5.0
-    } else {
-        10.0
-    } * mag;
-    let min = (lo / step).floor() * step;
-    let max = (hi / step).ceil() * step;
-    let max = if (max - min).abs() < 1e-12 { min + step } else { max };
-    (min, max, step)
+/// Office's automatic value-axis scale `(min, max, major unit)` for values in `[lo, hi]`, keeping
+/// the limits a chart fixes (`<c:min>`, `<c:max>`). The rule Office documents for automatic limits:
+///
+/// - **Minimum:** zero when every value is ≥ 0 and the smallest is below 5/6 of the largest;
+///   otherwise the first major unit at or below `lo − (hi − lo)/20`.
+/// - **Maximum:** the first major unit at or above `hi + (hi − lo)/20`.
+/// - All-negative values mirror this: the axis ends at zero when the largest is above 5/6 of the
+///   smallest.
+///
+/// The major unit is the smallest 1, 2 or 5 × 10ⁿ that gives at most 10 major intervals (#144).
+pub fn auto_scale(lo: f64, hi: f64, fixed_min: Option<f64>, fixed_max: Option<f64>) -> (f64, f64, f64) {
+    let fixed_min = fixed_min.filter(|v| v.is_finite());
+    let fixed_max = fixed_max.filter(|v| v.is_finite());
+    let (lo, hi) = if lo.is_finite() && hi.is_finite() { (lo.min(hi), lo.max(hi)) } else { (0.0, 0.0) };
+    let (lo, hi) = (fixed_min.unwrap_or(lo), fixed_max.unwrap_or(hi));
+    let pad = (hi - lo).abs() / 20.0;
+    let flat = (hi - lo).abs() < 1e-12;
+    // Where the axis has to reach, before rounding out to the major unit.
+    let low = match fixed_min {
+        Some(m) => m,
+        None if lo >= 0.0 && (flat || lo < hi * 5.0 / 6.0) => 0.0,
+        None => lo - pad,
+    };
+    let mut high = match fixed_max {
+        Some(m) => m,
+        None if hi <= 0.0 && (flat || hi > lo * 5.0 / 6.0) => 0.0,
+        None => hi + pad,
+    };
+    if high - low < 1e-12 {
+        high = low + low.abs().max(1.0);
+    }
+    // Smallest 1, 2 or 5 × 10ⁿ at or above a tenth of the span.
+    let raw = (high - low) / 10.0;
+    let mut exp = raw.log10().floor().clamp(-400.0, 400.0) as i32;
+    let mut mantissa = [1.0, 2.0, 5.0, 10.0].into_iter().find(|m| m * 10f64.powi(exp) >= raw * (1.0 - 1e-9)).unwrap_or(10.0);
+    let mut out = (low, high, raw);
+    // A rounded-out axis can need one more interval than the span; then the next unit fits.
+    for _ in 0..4 {
+        if mantissa >= 10.0 {
+            mantissa = 1.0;
+            exp = exp.saturating_add(1);
+        }
+        let step = if exp >= 0 { mantissa * 10f64.powi(exp) } else { mantissa / 10f64.powi(-exp) };
+        let min = fixed_min.unwrap_or_else(|| (low / step + 1e-9).floor() * step);
+        let max = fixed_max.unwrap_or_else(|| (high / step - 1e-9).ceil() * step);
+        let max = if max - min < 1e-12 { min + step } else { max };
+        out = (min, max, step);
+        if (max - min) / step <= 10.0 + 1e-9 {
+            break;
+        }
+        mantissa = if mantissa < 2.0 {
+            2.0
+        } else if mantissa < 5.0 {
+            5.0
+        } else {
+            10.0
+        };
+    }
+    // Spans too large or too small for f64 steps.
+    if [out.0, out.1, out.2].iter().all(|v| v.is_finite()) && out.2 > 0.0 && out.1 > out.0 { out } else { (0.0, 1.0, 0.1) }
 }
 
 #[cfg(test)]
@@ -271,13 +310,70 @@ mod tests {
     use super::*;
 
     #[test]
-    fn nice_scale_covers() {
-        let (a, b, s) = nice_scale(0.0, 5.1);
+    fn auto_scale_covers() {
+        let (a, b, s) = auto_scale(0.0, 5.1, None, None);
         assert!(a <= 0.0 && b >= 5.1 && s > 0.0);
-        let (a, b, _) = nice_scale(f64::NAN, 3.0);
-        assert!(a.is_finite() && b.is_finite());
-        let (a, b, _) = nice_scale(7.0, 7.0);
+        let (a, b, _) = auto_scale(f64::NAN, 3.0, None, None);
+        assert!(a.is_finite() && b.is_finite() && b > a);
+        let (a, b, _) = auto_scale(7.0, 7.0, None, None);
         assert!(b > a);
+        for (lo, hi, min, max) in
+            [(0.0, 1.0, Some(5.0), Some(5.0)), (-f64::MAX, f64::MAX, None, None), (0.0, 1e-320, None, None), (0.0, 1.0, Some(5.0), Some(1.0))]
+        {
+            let (a, b, s) = auto_scale(lo, hi, min, max);
+            assert!(a.is_finite() && b.is_finite() && b > a && s > 0.0, "{lo} {hi}: {a} {b} {s}");
+        }
+    }
+
+    fn column(values: &[f64]) -> Chart {
+        let series = Series { name: "Sales".into(), values: values.iter().map(|v| Some(*v)).collect(), ..Default::default() };
+        Chart { categories: (0..values.len()).map(|i| format!("C{i}")).collect(), series: vec![series], ..Default::default() }
+    }
+
+    /// #144: Office scales 42.1 / 18.7 / 6.3 as 0–45 in steps of 5, not 0–50 in steps of 10.
+    #[test]
+    fn automatic_axis_matches_office() {
+        assert_eq!(column(&[42.1, 18.7, 6.3]).axis_scale(), (0.0, 45.0, 5.0));
+        // PowerPoint's default chart data (max 5): 0–6 in steps of 1.
+        let mut c = column(&[4.3, 2.5, 3.5, 4.5]);
+        c.series.push(Series { values: [2.4, 4.4, 1.8, 2.8].map(Some).to_vec(), ..Default::default() });
+        c.series.push(Series { values: [2.0, 2.0, 3.0, 5.0].map(Some).to_vec(), ..Default::default() });
+        assert_eq!(c.axis_scale(), (0.0, 6.0, 1.0));
+        // A maximum of 100 (or 10) gets 5% headroom, which rounds up to the next major unit.
+        assert_eq!(column(&[100.0, 40.0]).axis_scale(), (0.0, 120.0, 20.0));
+        assert_eq!(column(&[10.0, 3.0]).axis_scale(), (0.0, 12.0, 2.0));
+        // Headroom 2.95 + 2.95/20 = 3.1 rounds up to 3.5.
+        assert_eq!(column(&[2.95, 0.0]).axis_scale(), (0.0, 3.5, 0.5));
+    }
+
+    #[test]
+    fn automatic_axis_minimum() {
+        // Below 5/6 of the maximum, the axis starts at zero; at or above it, near the data.
+        assert_eq!(column(&[59.0, 49.0]).axis_scale().0, 0.0);
+        let (min, max, step) = column(&[59.0, 50.0]).axis_scale();
+        assert!(min > 0.0 && min <= 50.0 - 0.45 && max >= 59.45 && (max - min) / step <= 10.0, "{min} {max} {step}");
+        // Negative data mirrors it: the axis ends at zero, and has headroom below.
+        assert_eq!(column(&[-42.1, -18.7, -6.3]).axis_scale(), (-45.0, 0.0, 5.0));
+        // Mixed signs get headroom at both ends.
+        assert_eq!(column(&[42.1, -18.7]).axis_scale(), (-30.0, 50.0, 10.0));
+    }
+
+    #[test]
+    fn fixed_axis_limits_are_kept() {
+        let mut c = column(&[42.1, 18.7, 6.3]);
+        c.y_max = Some(50.0);
+        assert_eq!(c.axis_scale(), (0.0, 50.0, 5.0));
+        c.y_min = Some(10.0);
+        c.y_max = None;
+        assert_eq!(c.axis_scale(), (10.0, 45.0, 5.0));
+        let mut p = column(&[42.1, 18.7, 6.3]);
+        p.kind = ChartType::PercentColumn;
+        assert_eq!(p.axis_scale(), (0.0, 1.0, 0.1));
+        // Degenerate data still gives an axis.
+        for (a, b) in [(0.0, 0.0), (7.0, 7.0), (f64::NAN, 3.0), (f64::INFINITY, 1.0)] {
+            let (min, max, step) = column(&[a, b]).axis_scale();
+            assert!(min.is_finite() && max > min && step > 0.0, "{a} {b}: {min} {max} {step}");
+        }
     }
 
     #[test]
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index a29b2023..0921771b 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -2,7 +2,7 @@
 
 use deckcraft_color::{ColorTransform, Rgba, SchemeSlot};
 use deckcraft_model::Shape;
-use deckcraft_model::chart::{Chart, ChartType, nice_scale};
+use deckcraft_model::chart::{Chart, ChartType};
 use deckcraft_model::resolve::Ctx;
 use deckcraft_model::style::{ColorRef, Fill};
 use deckcraft_model::text::{Align, Anchor, Bullet, TextBody};
@@ -162,8 +162,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         }
         return;
     }
-    let (lo, hi) = c.value_range();
-    let (min, max, step) = nice_scale(lo.min(0.0), hi);
+    let (min, max, step) = c.axis_scale();
     let horiz = c.kind.horizontal();
     // Axis label gutter.
     let gutter = base * 3.0;
@@ -176,7 +175,11 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         crate::paint::fill_path(ctx, rctx, f, None, &plot.to_path(0.1), plot, m, deckcraft_geom::preset::FillMode::Norm, 1.0, rctx.pres);
     }
     let span = (max - min).max(1e-9);
-    let to_v = |v: f64| if horiz { plot.x0 + (v - min) / span * plot.width() } else { plot.y1 - (v - min) / span * plot.height() };
+    // Values outside fixed axis limits stop at the plot's edge.
+    let to_v = |v: f64| {
+        let v = v.clamp(min, max);
+        if horiz { plot.x0 + (v - min) / span * plot.width() } else { plot.y1 - (v - min) / span * plot.height() }
+    };
     // Gridlines and value labels.
     let n_steps = ((span / step).round() as i64).clamp(1, 50);
     for k in 0..=n_steps {

From a3fae2c03132c9ecfa662584db4eb6f5fc475a8f Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sun, 11 Oct 2026 19:10:57 +0200
Subject: [PATCH 021/376] Ribbon: transition and animation tiles follow the
 dark theme (#159)

---
 crates/ui-egui/src/ribbon.rs | 38 ++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index c7c251ef..cf91a1f3 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1431,7 +1431,7 @@ fn option_label(o: &str) -> String {
 }
 
 pub fn paint_transition_tile(p: &egui::Painter, r: Rect, (id, label): (&str, &str)) {
-    let t = Tokens::light();
+    let t = Tokens::get(p.ctx());
     let pic = Rect::from_min_size(r.min + vec2(4.0, 2.0), vec2(r.width() - 8.0, r.height() - 18.0));
     let blue = Color32::from_rgb(0x2E, 0x6F, 0xD8);
     let light = Color32::from_rgb(0xBF, 0xD4, 0xF5);
@@ -1676,7 +1676,7 @@ fn animations(app: &mut SlideApp, ui: &mut Ui) {
 }
 
 pub fn paint_anim_tile(p: &egui::Painter, r: Rect, label: &str, class: AnimClass, enabled: bool) {
-    let t = Tokens::light();
+    let t = Tokens::get(p.ctx());
     let icon = match class {
         AnimClass::Entrance => Icon::AnimEntrance,
         AnimClass::Emphasis => Icon::AnimEmphasis,
@@ -2405,3 +2405,37 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Paints one transition tile and one animation tile and returns the colour of every label.
+    fn tile_label_colours(dark: bool) -> Vec<Color32> {
+        let ctx = egui::Context::default();
+        ctx.set_visuals(if dark { egui::Visuals::dark() } else { egui::Visuals::light() });
+        let r = Rect::from_min_size(pos2(0.0, 0.0), vec2(80.0, 60.0));
+        let mut out = ctx.run_ui(egui::RawInput::default(), |ui| {
+            paint_transition_tile(ui.painter(), r, ("fade", "Fade"));
+            paint_anim_tile(ui.painter(), r, "Appear", AnimClass::Entrance, true);
+        });
+        out.textures_delta.clear();
+        out.shapes
+            .iter()
+            .flat_map(|c| match &c.shape {
+                egui::Shape::Text(s) => s.galley.job.sections.iter().map(|x| x.format.color).collect(),
+                _ => Vec::new(),
+            })
+            .collect()
+    }
+
+    #[test]
+    fn ribbon_tile_labels_follow_the_theme() {
+        // #159: the transition and animation tiles were always painted with the light palette,
+        // so their labels were dark grey on the dark ribbon.
+        let dark = tile_label_colours(true);
+        assert_eq!(dark, vec![Tokens::dark().text; 2]);
+        let light = tile_label_colours(false);
+        assert_eq!(light, vec![Tokens::light().text; 2]);
+    }
+}

From 1ce5f686e80cb496751d6d047adef4fd70e806c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mat=C3=BA=C5=A1=20Laco?= <laco.matus@gmail.com>
Date: Sun, 11 Oct 2026 16:51:21 +0200
Subject: [PATCH 022/376] Notes: speaker notes show their formatting and keep
 it when edited

Notes from a .pptx were read and written with their formatting, but the notes pane and Notes
Page drew them as plain text (Slide::notes_text in a plain TextEdit), and any edit there saved
the text back through slide.notes as TextBody::from_text, dropping every bold run, level,
indent and bullet of the slide's notes.

- ui-egui: a notes editor (notes.rs) shared by the notes pane and Notes Page. It draws bold,
  italic, underline, strikethrough and size from the runs, and each paragraph's margin, hanging
  indent and bullet or number (Wingdings/Symbol bullets mapped as on slides); paragraphs are
  laid out one by one so wrapped lines align with the text, not the bullet. Each edit is applied
  to a formatted draft, so typed text takes the formatting where it lands (Enter in a bulleted
  point starts another), and the draft is saved once the field loses focus or the slide changes.
- engine: slide.notes takes `body` (formatted notes, as slide.inspect's new `notesBody`), and
  `text` now changes only what was retyped (model edit::replace_text); text sharing nothing
  with the old notes is still plain.
- text: map_symbol_bullet is public for the notes editor.

PDF notes pages still print the notes as plain text.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/inspect.rs |   3 +-
 crates/engine/src/cmd/slide.rs   |  22 ++-
 crates/engine/src/tests.rs       |  43 ++++
 crates/model/src/edit.rs         |  87 ++++++++
 crates/pptx/tests/notes.rs       |  82 ++++++++
 crates/text/src/lib.rs           |   3 +-
 crates/ui-egui/src/lib.rs        |  91 ++++++++-
 crates/ui-egui/src/notes.rs      | 327 +++++++++++++++++++++++++++++++
 crates/ui-egui/src/sorter.rs     |  33 ++--
 crates/ui-egui/src/status.rs     |  48 ++---
 docs/file-format-parity.md       |   5 +-
 11 files changed, 698 insertions(+), 46 deletions(-)
 create mode 100644 crates/pptx/tests/notes.rs
 create mode 100644 crates/ui-egui/src/notes.rs

diff --git a/crates/engine/src/cmd/inspect.rs b/crates/engine/src/cmd/inspect.rs
index db162a38..62f9abd1 100644
--- a/crates/engine/src/cmd/inspect.rs
+++ b/crates/engine/src/cmd/inspect.rs
@@ -10,7 +10,7 @@ use crate::{Result, Session};
 pub fn specs() -> Vec<CommandSpec> {
     vec![
         cmd!(query "document.inspect", "Inspect Presentation", [], None, "{} → slides with titles, layouts, shape counts; selection; size; theme", has_doc, document),
-        cmd!(query "slide.inspect", "Inspect Slide", [], None, "{index?} → the slide's shapes with ids, kinds, boxes, text, fills, animations, transition, notes", has_doc, slide),
+        cmd!(query "slide.inspect", "Inspect Slide", [], None, "{index?} → the slide's shapes with ids, kinds, boxes, text, fills, animations, transition, notes (text, and notesBody with its formatting)", has_doc, slide),
         cmd!(query "shape.inspect", "Inspect Shape", [], None, "{id} → full shape JSON plus its effective box", has_doc, shape),
         cmd!(query "commands.list", "List Commands", [], None, "{filter?: substring} → [{id, label, params, enabled}]", always, commands),
     ]
@@ -129,6 +129,7 @@ fn slide(s: &mut Session, p: &Value) -> Result<Value> {
         "transition": serde_json::to_value(&sl.transition).unwrap_or_default(),
         "animations": serde_json::to_value(&sl.animations).unwrap_or_default(),
         "notes": sl.notes_text(),
+        "notesBody": sl.notes,
         "comments": sl.comments.len(),
         "hidden": sl.hidden,
     }))
diff --git a/crates/engine/src/cmd/slide.rs b/crates/engine/src/cmd/slide.rs
index 3d8ad344..24dcda2e 100644
--- a/crates/engine/src/cmd/slide.rs
+++ b/crates/engine/src/cmd/slide.rs
@@ -32,7 +32,15 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("slide.hide", "Hide Slide", ["Slide Show", "Set Up"], None, "{index?, hidden?: bool}", has_slide, hide),
         cmd!("slide.layout", "Layout", ["Home", "Slides"], None, "{layout: name or kind, index?}", has_slide, set_layout),
         cmd!("slide.reset", "Reset", ["Home", "Slides"], None, "{index?}", has_slide, reset),
-        cmd!("slide.notes", "Notes", ["View"], None, "{text, index?}", has_slide, notes),
+        cmd!(
+            "slide.notes",
+            "Notes",
+            ["View"],
+            None,
+            "{text | body: formatted notes (as in slide.inspect's notesBody), index?} (text as typed: untouched notes keep their formatting)",
+            has_slide,
+            notes
+        ),
         cmd!("slide.rename", "Rename Slide", [], None, "{name, index?}", has_slide, rename),
         cmd!("section.add", "Add Section", ["Home", "Slides", "Section"], None, "{name?, at?: slide index}", has_slide, section_add),
         cmd!("section.rename", "Rename Section", ["Home", "Slides", "Section"], None, "{index, name}", has_slide, section_rename),
@@ -463,10 +471,20 @@ fn reset(s: &mut Session, p: &Value) -> Result<Value> {
 
 fn notes(s: &mut Session, p: &Value) -> Result<Value> {
     let i = index_of(s, p)?;
+    // Formatted notes as a whole (the notes editors), or text: then only what was retyped
+    // changes, so bold, levels and bullets around it survive.
+    let body = match p.get("body") {
+        Some(b) => Some(serde_json::from_value::<TextBody>(b.clone()).map_err(|e| bad("slide.notes", format!("invalid `body`: {e}")))?),
+        None => None,
+    };
     let text = str_param(p, "text").unwrap_or("").to_string();
     s.edit(|doc, _| {
         if let Some(sl) = doc.slides.get_mut(i) {
-            Arc::make_mut(sl).notes = TextBody::from_text(&text);
+            let notes = &mut Arc::make_mut(sl).notes;
+            match body {
+                Some(b) => *notes = b,
+                None => deckcraft_model::edit::replace_text(notes, &text),
+            }
         }
         Ok(())
     })?;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..dc879641 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -543,3 +543,46 @@ fn inserted_hyperlinks_look_like_links() {
     s.execute("format.underline", &json!({})).unwrap();
     assert_eq!(s.execute("format.state", &json!({})).unwrap()["underline"], false);
 }
+
+#[test]
+fn editing_notes_keeps_their_formatting_through_pptx() {
+    use deckcraft_model::text::{Bullet, ParaProps, Paragraph, Run, RunProps, TextBody};
+    // A deck whose notes have a bold heading over indented bullet points, as saved by PowerPoint.
+    let mut p = deckcraft_model::defaults::new_presentation(None);
+    let bullet = ParaProps { margin_left: Some(22.5), indent: Some(-22.5), bullet: Some(Bullet::Char { char: "•".into() }), ..Default::default() };
+    let point = |t: &str| Paragraph { level: 1, props: bullet.clone(), runs: vec![Run::new(t)], ..Default::default() };
+    std::sync::Arc::make_mut(&mut p.slides[0]).notes = TextBody {
+        paragraphs: vec![
+            Paragraph { runs: vec![Run::with("Overview", RunProps { bold: Some(true), ..Default::default() })], ..Default::default() },
+            point("First point"),
+            point("Second point"),
+        ],
+        ..Default::default()
+    };
+    let bytes = deckcraft_pptx::export(&p).unwrap();
+    let mut s = session();
+    s.execute("file.openBytes", &json!({"name": "notes.pptx", "data": crate::cmd::base64_encode(&bytes)})).unwrap();
+    // Type a word into the second bullet, as the notes pane does.
+    s.execute("slide.notes", &json!({"index": 0, "text": "Overview\nFirst point\nSecond main point"})).unwrap();
+    let check = |notes: &TextBody| {
+        assert_eq!(notes.text(), "Overview\nFirst point\nSecond main point");
+        assert_eq!(notes.paragraphs[0].runs[0].props.bold, Some(true));
+        for para in &notes.paragraphs[1..] {
+            assert_eq!(para.level, 1);
+            assert_eq!(para.props.margin_left, Some(22.5));
+            assert_eq!(para.props.indent, Some(-22.5));
+            assert_eq!(para.props.bullet, Some(Bullet::Char { char: "•".into() }));
+        }
+    };
+    check(&s.doc().unwrap().doc.slides[0].notes);
+    let saved = s.execute("file.saveBytes", &json!({"format": "pptx"})).unwrap()["data"].as_str().unwrap().to_string();
+    let reopened = deckcraft_pptx::import(&crate::cmd::base64_decode(&saved).unwrap()).unwrap();
+    check(&reopened.slides[0].notes);
+    // slide.inspect hands out the formatted notes, and slide.notes {body} takes them back as they are.
+    let body = s.execute("slide.inspect", &json!({"index": 0})).unwrap()["notesBody"].clone();
+    s.execute("slide.notes", &json!({"index": 0, "text": "Plain"})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.slides[0].notes, TextBody::from_text("Plain"), "new text shares nothing: plain");
+    s.execute("slide.notes", &json!({"index": 0, "body": body})).unwrap();
+    check(&s.doc().unwrap().doc.slides[0].notes);
+    assert!(s.execute("slide.notes", &json!({"index": 0, "body": 7})).is_err());
+}
diff --git a/crates/model/src/edit.rs b/crates/model/src/edit.rs
index dcdc5089..644fdc4b 100644
--- a/crates/model/src/edit.rs
+++ b/crates/model/src/edit.rs
@@ -355,6 +355,44 @@ pub fn char_move(body: &TextBody, pos: Pos, forward: bool) -> Pos {
     }
 }
 
+/// The position of the `n`th character of the body's plain text (`\n` between paragraphs).
+fn pos_of_char(body: &TextBody, mut n: usize) -> Pos {
+    for (pi, p) in body.paragraphs.iter().enumerate() {
+        let len = p.char_len();
+        if n <= len {
+            return (pi, n);
+        }
+        n -= len + 1;
+    }
+    end(body)
+}
+
+/// Make the body's plain text (paragraphs joined by `\n`) read `text`, as if it had been typed in
+/// place: only the span between the longest common prefix and suffix changes, so untouched text
+/// keeps its run and paragraph formatting and new text takes the formatting where it lands. Text
+/// that shares nothing with the old text replaces it as plain text.
+pub fn replace_text(body: &mut TextBody, text: &str) {
+    let old: Vec<char> = body.text().chars().collect();
+    let new: Vec<char> = text.chars().collect();
+    if old == new {
+        return;
+    }
+    let pre = old.iter().zip(&new).take_while(|(a, b)| a == b).count();
+    let room = old.len().min(new.len()) - pre;
+    let suf = old.iter().rev().zip(new.iter().rev()).take(room).take_while(|(a, b)| a == b).count();
+    if pre == 0 && suf == 0 {
+        *body = TextBody { body: body.body.clone(), list_style: body.list_style.clone(), ..TextBody::from_text(text) };
+        return;
+    }
+    let a = pos_of_char(body, pre);
+    let b = pos_of_char(body, old.len() - suf);
+    let at = delete(body, a, b);
+    let mid: String = new.get(pre..new.len() - suf).unwrap_or(&[]).iter().collect();
+    if !mid.is_empty() {
+        insert(body, at, &mid, None);
+    }
+}
+
 /// End of the body.
 pub fn end(body: &TextBody) -> Pos {
     let pi = body.paragraphs.len().saturating_sub(1);
@@ -472,4 +510,53 @@ mod tests {
         assert_eq!(b.paragraphs[0].char_len(), 3);
         assert_eq!(b.paragraphs.len(), 1);
     }
+
+    /// Speaker notes: a bold heading over indented bullet points.
+    fn notes() -> TextBody {
+        use crate::text::{Bullet, ParaProps};
+        let mut b = body("Overview\nFirst point\nSecond point");
+        format(&mut b, (0, 0), (0, 8), &|p| p.bold = Some(true));
+        for p in b.paragraphs.iter_mut().skip(1) {
+            p.level = 1;
+            p.props =
+                ParaProps { margin_left: Some(36.0), indent: Some(-18.0), bullet: Some(Bullet::Char { char: "•".into() }), ..Default::default() };
+        }
+        b
+    }
+
+    #[test]
+    fn replace_text_keeps_formatting() {
+        let before = notes();
+        // Same text: nothing changes.
+        let mut b = before.clone();
+        replace_text(&mut b, "Overview\nFirst point\nSecond point");
+        assert_eq!(b, before);
+        // A word typed into a bullet: heading stays bold, bullets keep level, indent and bullet.
+        replace_text(&mut b, "Overview\nFirst main point\nSecond point");
+        assert_eq!(b.text(), "Overview\nFirst main point\nSecond point");
+        assert_eq!(b.paragraphs[0].runs[0].props.bold, Some(true));
+        assert_eq!(b.paragraphs[1].props, before.paragraphs[1].props);
+        assert_eq!((b.paragraphs[1].level, b.paragraphs[2].level), (1, 1));
+        // Typing at the end of the heading continues it in bold.
+        replace_text(&mut b, "Overview (5 min)\nFirst main point\nSecond point");
+        assert_eq!(b.paragraphs[0].runs.len(), 1);
+        assert_eq!(b.paragraphs[0].runs[0].props.bold, Some(true));
+        // Enter after a bullet starts another bullet; deleting one joins nothing else.
+        replace_text(&mut b, "Overview (5 min)\nFirst main point\nThird\nSecond point");
+        assert_eq!(b.paragraphs.len(), 4);
+        assert_eq!((b.paragraphs[2].level, &b.paragraphs[2].props), (1, &before.paragraphs[1].props));
+        replace_text(&mut b, "Overview (5 min)\nSecond point");
+        assert_eq!(b.text(), "Overview (5 min)\nSecond point");
+        assert_eq!(b.paragraphs[0].runs[0].props.bold, Some(true));
+        assert_eq!(b.paragraphs[1].level, 1);
+        // Text with nothing in common is new plain text.
+        replace_text(&mut b, "Plain");
+        assert_eq!(b, body("Plain"));
+        replace_text(&mut b, "");
+        assert!(b.is_empty());
+        // Into an empty body.
+        let mut e = TextBody::default();
+        replace_text(&mut e, "a\nb");
+        assert_eq!(e.text(), "a\nb");
+    }
 }
diff --git a/crates/pptx/tests/notes.rs b/crates/pptx/tests/notes.rs
new file mode 100644
index 00000000..b5863d51
--- /dev/null
+++ b/crates/pptx/tests/notes.rs
@@ -0,0 +1,82 @@
+//! Speaker notes keep their run and paragraph formatting: a bold heading, indented points with
+//! custom bullets, plain lines.
+
+use std::io::{Cursor, Read, Write};
+use std::sync::Arc;
+
+use deckcraft_model::defaults;
+use deckcraft_model::text::{Bullet, ParaProps, TextBody};
+
+const NOTES: &str = "ppt/notesSlides/notesSlide1.xml";
+
+/// A notes slide written the way PowerPoint writes one (Slovak text): a bold heading, a plain
+/// line, two level-2 points with a hanging indent and a Wingdings square bullet (one mixing a bold
+/// label and plain text), a level-2 paragraph with buNone, and a closing plain line.
+const NOTES_XML: &str = r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<p:notes xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main"><p:cSld><p:spTree><p:nvGrpSpPr><p:cNvPr id="1" name=""/><p:cNvGrpSpPr/><p:nvPr/></p:nvGrpSpPr><p:grpSpPr><a:xfrm><a:off x="0" y="0"/><a:ext cx="0" cy="0"/><a:chOff x="0" y="0"/><a:chExt cx="0" cy="0"/></a:xfrm></p:grpSpPr><p:sp><p:nvSpPr><p:cNvPr id="2" name="Slide Image Placeholder 1"/><p:cNvSpPr><a:spLocks noGrp="1" noRot="1" noChangeAspect="1"/></p:cNvSpPr><p:nvPr><p:ph type="sldImg"/></p:nvPr></p:nvSpPr><p:spPr/></p:sp><p:sp><p:nvSpPr><p:cNvPr id="3" name="Notes Placeholder 2"/><p:cNvSpPr><a:spLocks noGrp="1"/></p:cNvSpPr><p:nvPr><p:ph type="body" idx="1"/></p:nvPr></p:nvSpPr><p:spPr/><p:txBody><a:bodyPr/><a:lstStyle/><a:p><a:r><a:rPr lang="sk-SK" b="1" dirty="0"/><a:t>Metodický prehľad</a:t></a:r></a:p><a:p><a:r><a:rPr lang="sk-SK" dirty="0"/><a:t>Žiaci pracujú vo dvojiciach.</a:t></a:r></a:p><a:p><a:pPr marL="285750" lvl="1" indent="-285750"><a:buFont typeface="Wingdings" panose="05000000000000000000" pitchFamily="2" charset="2"/><a:buChar char="&#167;"/></a:pPr><a:r><a:rPr lang="sk-SK" b="1" dirty="0"/><a:t>Cieľ: </a:t></a:r><a:r><a:rPr lang="sk-SK" dirty="0"/><a:t>vysvetliť cyklus</a:t></a:r></a:p><a:p><a:pPr marL="285750" lvl="1" indent="-285750"><a:buFont typeface="Wingdings" panose="05000000000000000000" pitchFamily="2" charset="2"/><a:buChar char="&#167;"/></a:pPr><a:r><a:rPr lang="sk-SK" i="1" dirty="0"/><a:t>Reflexia</a:t></a:r></a:p><a:p><a:pPr marL="285750" lvl="1" indent="-285750"><a:buNone/></a:pPr><a:r><a:rPr lang="sk-SK" dirty="0"/><a:t>Bez odrážky</a:t></a:r></a:p><a:p><a:r><a:rPr lang="sk-SK" dirty="0"/><a:t>Pomôcky: počítač</a:t></a:r></a:p></p:txBody></p:sp></p:spTree></p:cSld><p:clrMapOvr><a:masterClrMapping/></p:clrMapOvr></p:notes>"#;
+
+/// A deck with one notes slide, its notes replaced by [`NOTES_XML`].
+fn deck() -> Vec<u8> {
+    let mut p = defaults::new_presentation(None);
+    Arc::make_mut(&mut p.slides[0]).notes = TextBody::from_text("placeholder");
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut src = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let mut found = false;
+    for i in 0..src.len() {
+        let mut f = src.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        let mut data = vec![];
+        f.read_to_end(&mut data).expect("read");
+        if name == NOTES {
+            data = NOTES_XML.as_bytes().to_vec();
+            found = true;
+        }
+        out.start_file(name, zip::write::SimpleFileOptions::default()).expect("start");
+        out.write_all(&data).expect("write");
+    }
+    assert!(found, "the export has no {NOTES}");
+    out.finish().expect("finish").into_inner()
+}
+
+fn assert_formatted(notes: &TextBody) {
+    assert_eq!(notes.text(), "Metodický prehľad\nŽiaci pracujú vo dvojiciach.\nCieľ: vysvetliť cyklus\nReflexia\nBez odrážky\nPomôcky: počítač");
+    let [head, plain, goal, reflect, unbulleted, closing] = notes.paragraphs.as_slice() else { panic!("six paragraphs: {notes:?}") };
+    assert_eq!(head.runs[0].props.bold, Some(true), "bold heading");
+    for para in [head, plain, closing] {
+        assert_eq!((para.level, &para.props), (0, &ParaProps::default()), "{:?}", para.text());
+    }
+    assert_eq!(plain.runs[0].props.bold, None);
+    for para in [goal, reflect] {
+        assert_eq!(para.level, 1, "level 2");
+        assert_eq!(para.props.margin_left, Some(22.5), "marL 285750 EMU");
+        assert_eq!(para.props.indent, Some(-22.5), "hanging indent");
+        assert_eq!(para.props.bullet, Some(Bullet::Char { char: "§".into() }));
+        assert_eq!(para.props.bullet_font.as_deref(), Some("Wingdings"));
+    }
+    assert_eq!((goal.runs[0].text.as_str(), goal.runs[0].props.bold), ("Cieľ: ", Some(true)), "bold label");
+    assert_eq!((goal.runs[1].text.as_str(), goal.runs[1].props.bold), ("vysvetliť cyklus", None), "then plain");
+    assert_eq!(reflect.runs[0].props.italic, Some(true));
+    assert_eq!((unbulleted.level, unbulleted.props.bullet.clone(), unbulleted.props.margin_left), (1, Some(Bullet::None), Some(22.5)));
+}
+
+#[test]
+fn notes_import_keeps_bold_levels_and_indents() {
+    let p = deckcraft_pptx::import(&deck()).expect("import");
+    assert_formatted(&p.slides[0].notes);
+}
+
+#[test]
+fn notes_formatting_survives_a_round_trip() {
+    let p = deckcraft_pptx::import(&deck()).expect("import");
+    let again = deckcraft_pptx::import(&deckcraft_pptx::export(&p).expect("export")).expect("reimport");
+    assert_formatted(&again.slides[0].notes);
+    // And the written XML says so, for PowerPoint.
+    let bytes = deckcraft_pptx::export(&again).expect("export");
+    let mut z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut xml = String::new();
+    z.by_name(NOTES).expect("notes part").read_to_string(&mut xml).expect("utf-8");
+    assert!(xml.contains(r#"b="1""#), "{xml}");
+    assert!(xml.contains(r#"lvl="1""#) && xml.contains(r#"marL="285750""#) && xml.contains(r#"indent="-285750""#), "{xml}");
+    assert!(xml.contains(r#"<a:buFont typeface="Wingdings""#) && xml.contains("<a:buChar") && xml.contains("<a:buNone/>"), "{xml}");
+}
diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index 225f4afb..07f4f3ec 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -659,7 +659,8 @@ fn shape_item(
     }
 }
 
-fn map_symbol_bullet(c: &str, font: Option<&str>) -> String {
+/// The Unicode bullet for a symbol-font bullet character (Wingdings, Symbol), or the character.
+pub fn map_symbol_bullet(c: &str, font: Option<&str>) -> String {
     let f = font.unwrap_or("").to_ascii_lowercase();
     let first = c.chars().next().unwrap_or('•');
     if f.contains("wingdings") || f.contains("symbol") || ('\u{f000}'..='\u{f0ff}').contains(&first) {
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index bef64a4f..f4292eb0 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -14,6 +14,7 @@ pub mod fillui;
 pub mod icons;
 pub mod media;
 pub mod menus;
+pub mod notes;
 pub mod panes;
 pub mod ribbon;
 pub mod show;
@@ -206,7 +207,7 @@ pub struct SlideApp {
     pub last_recovery: f64,
     /// Quit was confirmed (changes saved or discarded): let the window close.
     pub quit_confirmed: bool,
-    pub(crate) notes_buf: (u64, usize, String),
+    pub(crate) notes_buf: (u64, usize, notes::Draft),
     /// Thumbnail pane drag (slide index, current drop index).
     pub(crate) thumb_drag: Option<(usize, usize)>,
 }
@@ -242,7 +243,7 @@ impl SlideApp {
             last_time: 0.0,
             last_recovery: 0.0,
             quit_confirmed: false,
-            notes_buf: (0, usize::MAX, String::new()),
+            notes_buf: (0, usize::MAX, notes::Draft::default()),
             thumb_drag: None,
         }
     }
@@ -938,4 +939,90 @@ mod tests {
         app.run("app.home", json!({})).unwrap();
         assert!(!app.home_open() && app.home.is_none(), "with nothing open the start screen shows anyway");
     }
+
+    /// Speaker notes keep their formatting when edited in the notes pane: typing into a bold
+    /// heading, Enter in a bulleted point, then saving as .pptx and reopening.
+    #[test]
+    fn editing_notes_in_the_pane_keeps_their_formatting() {
+        use deckcraft_model::text::{Bullet, ParaProps, Paragraph, Run, RunProps, TextBody};
+        let point = |runs: Vec<Run>| Paragraph {
+            level: 1,
+            props: ParaProps {
+                margin_left: Some(22.5),
+                indent: Some(-22.5),
+                bullet: Some(Bullet::Char { char: "§".into() }),
+                bullet_font: Some("Wingdings".into()),
+                ..Default::default()
+            },
+            runs,
+            ..Default::default()
+        };
+        let bold = RunProps { bold: Some(true), ..Default::default() };
+        let notes = TextBody {
+            paragraphs: vec![
+                Paragraph { runs: vec![Run::with("Metodický prehľad", bold.clone())], ..Default::default() },
+                Paragraph::new("Žiaci pracujú vo dvojiciach."),
+                point(vec![Run::with("Cieľ: ", bold.clone()), Run::new("vysvetliť cyklus")]),
+                point(vec![Run::new("Reflexia")]),
+                Paragraph::new("Pomôcky: počítač"),
+            ],
+            ..Default::default()
+        };
+        let mut session = Session::with_new();
+        session.execute("slide.notes", &json!({"index": 0, "body": notes})).unwrap();
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(session, Services::default()),
+        );
+        harness.run_steps(2);
+        let id = egui::Id::new("notes_edit");
+        let caret = |h: &mut egui_kittest::Harness<'_, SlideApp>, at: usize| {
+            let mut st = egui::TextEdit::load_state(&h.ctx, id).unwrap_or_default();
+            st.cursor.set_char_range(Some(egui::text::CCursorRange::one(egui::text::CCursor::new(at))));
+            egui::TextEdit::store_state(&h.ctx, id, st);
+        };
+        let chars = |s: &str, of: &str| s.find(of).map(|b| s[..b].chars().count() + of.chars().count()).unwrap();
+        let text = notes.text();
+        harness.ctx.memory_mut(|m| m.request_focus(id));
+        harness.run_steps(1);
+        // Type into the bold heading.
+        caret(&mut harness, chars(&text, "prehľad"));
+        harness.run_steps(1);
+        harness.event(egui::Event::Text(" hodiny".into()));
+        harness.run_steps(1);
+        // Enter after a bulleted point, and type the next one.
+        let text = text.replacen("prehľad", "prehľad hodiny", 1);
+        caret(&mut harness, chars(&text, "cyklus"));
+        harness.run_steps(1);
+        harness.key_press(egui::Key::Enter);
+        harness.event(egui::Event::Text("Nový bod".into()));
+        harness.run_steps(1);
+        // Leave the field: the notes are saved.
+        harness.ctx.memory_mut(|m| m.surrender_focus(id));
+        harness.run_steps(2);
+        let check = |n: &TextBody| {
+            assert_eq!(
+                n.text(),
+                "Metodický prehľad hodiny\nŽiaci pracujú vo dvojiciach.\nCieľ: vysvetliť cyklus\nNový bod\nReflexia\nPomôcky: počítač"
+            );
+            assert_eq!(n.paragraphs[0].runs.len(), 1, "{n:?}");
+            assert_eq!(n.paragraphs[0].runs[0].props.bold, Some(true));
+            assert_eq!(n.paragraphs[1].props, ParaProps::default());
+            assert_eq!(n.paragraphs[2].runs[0].props.bold, Some(true), "the bold label");
+            assert_eq!(n.paragraphs[2].runs[1].props.bold, None);
+            for i in [2, 3, 4] {
+                assert_eq!((n.paragraphs[i].level, &n.paragraphs[i].props), (1, &notes.paragraphs[2].props), "point {i}");
+            }
+            assert_eq!((n.paragraphs[5].level, &n.paragraphs[5].props), (0, &ParaProps::default()));
+        };
+        check(&harness.state().session.active().unwrap().doc.slides[0].notes);
+        // Saved as .pptx and reopened.
+        let s = &mut harness.state_mut().session;
+        let data = s.execute("file.saveBytes", &json!({"format": "pptx"})).unwrap()["data"].clone();
+        s.execute("file.openBytes", &json!({"name": "notes.pptx", "data": data})).unwrap();
+        check(&s.active().unwrap().doc.slides[0].notes);
+    }
 }
diff --git a/crates/ui-egui/src/notes.rs b/crates/ui-egui/src/notes.rs
new file mode 100644
index 00000000..20533735
--- /dev/null
+++ b/crates/ui-egui/src/notes.rs
@@ -0,0 +1,327 @@
+//! Speaker notes editing (the notes pane and Notes Page view). The notes are edited as text and
+//! drawn with their formatting: bold, italic, underline, strikethrough and size from the runs,
+//! indents (wrapped lines included) and bullets or numbers from the paragraphs. Each edit is
+//! applied to a formatted draft, so typed text takes the formatting where it lands and the rest
+//! keeps its own; the draft is saved with `slide.notes {body}` once the editor loses focus.
+
+use std::sync::Arc;
+
+use deckcraft_model::edit;
+use deckcraft_model::text::{Bullet, Paragraph, RunProps, Strike, TextBody};
+use egui::text::{CCursor, Galley, LayoutJob, TextFormat};
+use egui::{Align2, Color32, Stroke, Ui, vec2};
+
+use crate::theme;
+
+/// Size and colour of a notes editor's text.
+pub struct Look {
+    /// Pixels for 12 pt text, the notes' default size; indents scale with it.
+    pub size: f32,
+    /// `None` = the widget text colour.
+    pub color: Option<Color32>,
+}
+
+/// Notes being edited: the text in the editor and the formatted notes it stands for.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct Draft {
+    pub text: String,
+    pub body: TextBody,
+    /// Edited since it was saved.
+    pub edited: bool,
+}
+
+impl Draft {
+    pub fn new(body: &TextBody) -> Self {
+        Draft { text: body.text(), body: body.clone(), edited: false }
+    }
+}
+
+/// The draft as it reads with `text` typed in (one edit since the draft): `None` when that can't
+/// be mapped onto it.
+fn typed(body: &TextBody, text: &str) -> Option<TextBody> {
+    let mut b = body.clone();
+    edit::replace_text(&mut b, text);
+    (b.text() == text).then_some(b)
+}
+
+/// A length in points from the file as pixels, bounded.
+fn px(pt: f64, k: f32) -> f32 {
+    if pt.is_finite() { pt.clamp(0.0, 400.0) as f32 * k } else { 0.0 }
+}
+
+/// Where a paragraph's first line starts and its other lines start (points): a level without its
+/// own margin is indented 36 pt per level, as in the default notes master.
+fn indents(p: &Paragraph) -> (f64, f64) {
+    let margin = p.props.margin_left.unwrap_or(36.0 * f64::from(p.level.min(8)));
+    let first = margin + p.props.indent.unwrap_or(0.0);
+    (first, margin)
+}
+
+/// Each paragraph's bullet or number, numbered as on a slide (per level, restarting after an
+/// unnumbered paragraph at the same or a lower level).
+fn bullets(body: &TextBody) -> Vec<Option<String>> {
+    let mut numbering = [0u32; 9];
+    body.paragraphs
+        .iter()
+        .map(|p| {
+            let lvl = usize::from(p.level.min(8));
+            if p.is_empty() {
+                return None;
+            }
+            let auto = matches!(p.props.bullet, Some(Bullet::AutoNum { .. }));
+            for (i, n) in numbering.iter_mut().enumerate().skip(lvl) {
+                if i > lvl || !auto {
+                    *n = 0;
+                }
+            }
+            match p.props.bullet.as_ref()? {
+                Bullet::None => None,
+                Bullet::Char { char } => Some(deckcraft_text::map_symbol_bullet(char, p.props.bullet_font.as_deref())),
+                Bullet::AutoNum { scheme, start_at } => {
+                    let n = numbering.get_mut(lvl)?;
+                    *n = n.saturating_add(1);
+                    Some(deckcraft_text::autonum(scheme, start_at.saturating_sub(1).saturating_add(*n)))
+                }
+                Bullet::Picture { .. } => Some("•".into()),
+            }
+        })
+        .collect()
+}
+
+fn format(props: &RunProps, size: f32, color: Color32) -> TextFormat {
+    let size = match props.size {
+        Some(pt) if pt.is_finite() && pt > 0.0 => (size * pt as f32 / 12.0).clamp(size * 0.75, size * 2.0),
+        _ => size,
+    };
+    let font = if props.bold == Some(true) { theme::bold(size) } else { theme::font(size) };
+    let mut f = TextFormat::simple(font, color);
+    f.italics = props.italic == Some(true);
+    if props.underline.as_deref().is_some_and(|u| u != "none") {
+        f.underline = Stroke::new(1.0, color);
+    }
+    if matches!(props.strike, Some(Strike::Single | Strike::Double)) {
+        f.strikethrough = Stroke::new(1.0, color);
+    }
+    f
+}
+
+/// One paragraph to lay out: wrapped lines start at the margin (pixels), the first line's text at
+/// `text`, clear of a bullet.
+struct ParaLayout {
+    job: LayoutJob,
+    margin: f32,
+    /// x of the first line's text.
+    text: f32,
+}
+
+fn para_layout(p: &Paragraph, bullet: Option<&str>, size: f32, color: Color32, wrap: f32) -> ParaLayout {
+    let k = size / 12.0;
+    let (first, margin) = indents(p);
+    let (first, margin) = (px(first, k), px(margin, k));
+    let text = match bullet {
+        // The text starts at the margin, after the bullet if it's wider than the hanging indent.
+        Some(b) => margin.max(first + size * (0.4 + 0.6 * b.chars().count() as f32)),
+        None => first,
+    };
+    let mut job = LayoutJob::default();
+    job.wrap.max_width = (wrap - margin).max(size * 4.0);
+    let mut lead = (text - margin).max(0.0);
+    for r in &p.runs {
+        let t = r.content();
+        if !t.is_empty() {
+            job.append(t, lead, format(&r.props, size, color));
+            lead = 0.0;
+        }
+    }
+    if job.text.is_empty() {
+        job.append("", 0.0, format(&p.end_props, size, color));
+    }
+    ParaLayout { job, margin, text }
+}
+
+/// The whole notes as one job (the galley's text and formats).
+fn job(body: &TextBody, size: f32, color: Color32, wrap: f32) -> LayoutJob {
+    let mut job = LayoutJob::default();
+    job.wrap.max_width = wrap;
+    for (i, (p, bullet)) in body.paragraphs.iter().zip(bullets(body)).enumerate() {
+        if i > 0 {
+            job.append("\n", 0.0, TextFormat::simple(theme::font(size), color));
+        }
+        let pl = para_layout(p, bullet.as_deref(), size, color, wrap);
+        for s in pl.job.sections {
+            if let Some(t) = pl.job.text.get(s.byte_range.start.0..s.byte_range.end.0) {
+                job.append(t, s.leading_space, s.format);
+            }
+        }
+    }
+    job
+}
+
+/// Lay the notes out paragraph by paragraph, each moved to its indent, so wrapped lines line up
+/// under the text and not under the bullet.
+fn galley(ui: &Ui, body: &TextBody, size: f32, color: Color32, wrap: f32) -> Arc<Galley> {
+    let whole = job(body, size, color, wrap);
+    if body.paragraphs.is_empty() {
+        return ui.fonts_mut(|f| f.layout_job(whole));
+    }
+    let parts: Vec<Arc<Galley>> = ui.fonts_mut(|f| {
+        body.paragraphs
+            .iter()
+            .zip(bullets(body))
+            .map(|(p, bullet)| {
+                let pl = para_layout(p, bullet.as_deref(), size, color, wrap);
+                let mut g = (*f.layout_job(pl.job)).clone();
+                for (i, row) in g.rows.iter_mut().enumerate() {
+                    // The first line already holds the gap after a bullet; a first line hanging
+                    // left of the margin without one starts there.
+                    row.pos.x += if i == 0 { pl.margin.min(pl.text) } else { pl.margin };
+                }
+                Arc::new(g)
+            })
+            .collect()
+    });
+    Arc::new(Galley::concat(Arc::new(whole), &parts, ui.ctx().pixels_per_point()))
+}
+
+/// A multiline editor for the draft that draws its formatting; `configure` sets the id, hint,
+/// size and frame. Edits update the draft's text and formatted body.
+pub fn editor(
+    ui: &mut Ui,
+    draft: &mut Draft,
+    look: &Look,
+    configure: impl for<'a> FnOnce(egui::TextEdit<'a>) -> egui::TextEdit<'a>,
+) -> egui::Response {
+    let color = look.color.unwrap_or_else(|| ui.visuals().override_text_color.unwrap_or_else(|| ui.visuals().widgets.inactive.text_color()));
+    let size = look.size;
+    let before = draft.body.clone();
+    let mut layouter = |ui: &Ui, text: &dyn egui::TextBuffer, wrap: f32| match typed(&before, text.as_str()) {
+        Some(b) => galley(ui, &b, size, color, wrap),
+        None => ui.fonts_mut(|f| f.layout_job(LayoutJob::simple(text.as_str().to_string(), theme::font(size), color, wrap))),
+    };
+    let out = configure(egui::TextEdit::multiline(&mut draft.text)).layouter(&mut layouter).show(ui);
+    if draft.body.text() != draft.text {
+        edit::replace_text(&mut draft.body, &draft.text);
+        draft.edited = true;
+    }
+    // Bullets and numbers sit at the start of each paragraph's first line.
+    if draft.body.text() == draft.text {
+        let painter = ui.painter().with_clip_rect(out.text_clip_rect);
+        let k = size / 12.0;
+        let mut at = 0usize;
+        for (p, bullet) in draft.body.paragraphs.iter().zip(bullets(&draft.body)) {
+            if let Some(b) = bullet {
+                let row = out.galley.pos_from_cursor(CCursor::new(at));
+                let pos = out.galley_pos + vec2(px(indents(p).0, k), row.center().y);
+                let font = theme::font(row.height().clamp(size * 0.75, size * 2.0) * 0.8);
+                painter.text(pos, Align2::LEFT_CENTER, b, font, color);
+            }
+            at += p.char_len() + 1;
+        }
+    }
+    out.response.response
+}
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used)]
+
+    use deckcraft_model::text::{ParaProps, Run};
+
+    use super::*;
+
+    /// Notes as PowerPoint users write them: a bold heading, a plain line, points with a
+    /// Wingdings square bullet and a hanging indent (one long enough to wrap), numbered points,
+    /// a point with an explicit buNone, closing plain lines; Slovak text throughout.
+    fn notes() -> TextBody {
+        let props = |bullet: Bullet| ParaProps {
+            margin_left: Some(22.5),
+            indent: Some(-22.5),
+            bullet: Some(bullet),
+            bullet_font: Some("Wingdings".into()),
+            ..Default::default()
+        };
+        let point = |runs: Vec<Run>, bullet: Bullet| Paragraph { level: 1, props: props(bullet), runs, ..Default::default() };
+        let square = || Bullet::Char { char: "§".into() };
+        let num = || Bullet::AutoNum { scheme: "arabicPeriod".into(), start_at: 1 };
+        let bold = RunProps { bold: Some(true), ..Default::default() };
+        TextBody {
+            paragraphs: vec![
+                Paragraph { runs: vec![Run::with("Metodický prehľad", bold.clone())], ..Default::default() },
+                Paragraph::new("Žiaci pracujú vo dvojiciach."),
+                point(vec![Run::with("Cieľ: ", bold), Run::new("vysvetliť cyklus")], square()),
+                point(vec![Run::new("Dlhý bod, ktorý sa zalomí na viac riadkov, lebo je naozaj veľmi dlhý a pokračuje ďalej.")], square()),
+                point(vec![Run::new("Jeden")], num()),
+                point(vec![Run::new("Dva")], num()),
+                point(vec![Run::new("Bez odrážky")], Bullet::None),
+                Paragraph::new("Pomôcky: počítač"),
+            ],
+            ..Default::default()
+        }
+    }
+
+    #[test]
+    fn bullets_follow_the_paragraphs() {
+        let b = bullets(&notes());
+        assert_eq!(b, vec![None, None, Some("▪".into()), Some("▪".into()), Some("1.".into()), Some("2.".into()), None, None]);
+    }
+
+    #[test]
+    fn notes_show_bold_runs_indents_and_wrap_under_the_text() {
+        let body = notes();
+        let ctx = egui::Context::default();
+        theme::install_fonts(&ctx);
+        let mut laid = None;
+        let mut out = ctx.run_ui(Default::default(), |ui| laid = Some(galley(ui, &body, 12.0, Color32::BLACK, 300.0)));
+        out.textures_delta.clear();
+        let g = laid.unwrap();
+        assert_eq!(g.job.text, body.text(), "the galley reads the notes");
+        assert_eq!(g.rows.iter().map(|r| r.char_count_including_newline().0).sum::<usize>(), body.text().chars().count());
+        // Bold where the runs are bold, regular elsewhere.
+        let font_of = |s: &str| {
+            let b = g.job.text.find(s).unwrap();
+            g.job.sections.iter().find(|x| (x.byte_range.start.0..x.byte_range.end.0).contains(&b)).unwrap().format.font_id.clone()
+        };
+        assert_eq!(font_of("Metodický"), theme::bold(12.0));
+        assert_eq!(font_of("Cieľ"), theme::bold(12.0));
+        assert_eq!(font_of("vysvetliť"), theme::font(12.0));
+        assert_eq!(font_of("Pomôcky"), theme::font(12.0));
+        // Rows: x where each paragraph's text starts.
+        let row_x = |s: &str| {
+            let at = body.text().find(s).map(|b| body.text()[..b].chars().count()).unwrap();
+            g.pos_from_cursor(CCursor::new(at)).min.x
+        };
+        assert!(row_x("Metodický") < 1.0 && row_x("Žiaci") < 1.0 && row_x("Pomôcky") < 1.0, "plain paragraphs aren't indented");
+        assert!((row_x("Cieľ") - 22.5).abs() < 1.0, "bulleted text at the 22.5 pt margin: {}", row_x("Cieľ"));
+        assert!((row_x("Bez odrážky") - 0.0).abs() < 1.0, "buNone: no bullet, the first line hangs to 0");
+        // The long point wraps, and its wrapped lines start at the margin, not under the bullet.
+        let long = body.text().find("Dlhý").map(|b| body.text()[..b].chars().count()).unwrap();
+        let first_row = g.pos_from_cursor(CCursor::new(long));
+        let wrapped: Vec<_> =
+            g.rows.iter().filter(|r| r.pos.y > first_row.min.y + 1.0 && r.pos.y < g.pos_from_cursor(CCursor::new(long + 80)).max.y).collect();
+        assert!(!wrapped.is_empty(), "the long point wraps");
+        assert!(wrapped.iter().all(|r| (r.pos.x - 22.5).abs() < 1.0), "wrapped lines align with the text");
+    }
+
+    #[test]
+    fn typing_keeps_the_formatting_around_it() {
+        let mut d = Draft::new(&notes());
+        // Typing into the bold heading continues it in bold.
+        let t = d.text.replacen("prehľad", "prehľad hodiny", 1);
+        d.body = typed(&d.body, &t).unwrap();
+        assert_eq!(d.body.paragraphs[0].runs.len(), 1);
+        assert_eq!(d.body.paragraphs[0].runs[0].props.bold, Some(true));
+        // Enter at the end of a bulleted point starts another one with the same bullet and indent.
+        let t = d.body.text().replacen("cyklus", "cyklus\nnový bod", 1);
+        d.body = typed(&d.body, &t).unwrap();
+        let new = &d.body.paragraphs[3];
+        assert_eq!(new.text(), "nový bod");
+        assert_eq!((new.level, &new.props), (1, &notes().paragraphs[2].props));
+        assert_eq!(d.body.paragraphs[2].runs[0].props.bold, Some(true), "the bold label stays bold");
+        // Hostile sizes and indents stay bounded.
+        let mut wild = notes();
+        wild.paragraphs[2].props.margin_left = Some(f64::NAN);
+        wild.paragraphs[0].runs[0].props.size = Some(f64::INFINITY);
+        let j = job(&wild, 12.0, Color32::BLACK, 300.0);
+        assert!(j.sections.iter().all(|s| s.leading_space.is_finite() && s.format.font_id.size <= 24.0));
+    }
+}
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index dd26dd85..c67b9e6f 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -132,22 +132,27 @@ pub fn notes_page(app: &mut SlideApp, ui: &mut Ui) {
     ui.painter().rect_stroke(srect, CornerRadius::ZERO, Stroke::new(1.0, Color32::GRAY), egui::StrokeKind::Outside);
     let notes_rect = Rect::from_min_max(pos2(srect.min.x, srect.max.y + 24.0), pos2(srect.max.x, page.max.y - page_h * 0.06));
     let mut child = ui.new_child(egui::UiBuilder::new().max_rect(notes_rect));
-    let current = st.current_slide().map(|s| s.notes_text()).unwrap_or_default();
     let id = egui::Id::new(("notespage", idx));
-    let mut buf: String = child.data_mut(|d| d.get_temp(id).unwrap_or_else(|| current.clone()));
-    let r = child.add(
-        egui::TextEdit::multiline(&mut buf)
-            .hint_text("Click to add text")
-            .desired_width(notes_rect.width())
-            .desired_rows(12)
-            .frame(egui::Frame::NONE)
-            .text_color(Color32::from_gray(30))
-            .font(theme::font(14.0)),
-    );
-    if r.lost_focus() && buf != current {
-        let _ = app.run("slide.notes", json!({"text": buf, "index": idx}));
+    let edit_id = egui::Id::new(("notespage-edit", idx));
+    let focused = child.ctx().memory(|m| m.has_focus(edit_id));
+    let mut draft: Option<crate::notes::Draft> = child.data_mut(|d| d.get_temp(id));
+    // Save an edited draft once the field has lost focus, before anything reloads it.
+    if !focused && let Some(d) = draft.as_mut().filter(|d| d.edited) {
+        d.edited = false;
+        let _ = app.run("slide.notes", json!({"body": d.body, "index": idx}));
     }
-    child.data_mut(|d| d.insert_temp(id, buf));
+    let notes = app.session.active().and_then(|st| st.doc.slides.get(idx)).map(|s| s.notes.clone()).unwrap_or_default();
+    let mut draft = draft.filter(|d| focused || d.body == notes).unwrap_or_else(|| crate::notes::Draft::new(&notes));
+    let look = crate::notes::Look { size: 14.0, color: Some(Color32::from_gray(30)) };
+    let width = notes_rect.width();
+    let r = crate::notes::editor(&mut child, &mut draft, &look, |e| {
+        e.id(edit_id).hint_text("Click to add text").desired_width(width).desired_rows(12).frame(egui::Frame::NONE)
+    });
+    if r.lost_focus() && draft.edited {
+        draft.edited = false;
+        let _ = app.run("slide.notes", json!({"body": draft.body, "index": idx}));
+    }
+    child.data_mut(|d| d.insert_temp(id, draft));
     let nav = ui.input(|i| (i.key_pressed(egui::Key::PageDown), i.key_pressed(egui::Key::PageUp)));
     if nav.0 {
         let _ = app.run("slide.next", json!({}));
diff --git a/crates/ui-egui/src/status.rs b/crates/ui-egui/src/status.rs
index a6f4eb11..fa272642 100644
--- a/crates/ui-egui/src/status.rs
+++ b/crates/ui-egui/src/status.rs
@@ -115,9 +115,18 @@ pub fn notes_pane(app: &mut SlideApp, ui: &mut Ui) {
     if st.selection.target != deckcraft_engine::Target::Slides {
         return;
     }
-    let idx = st.selection.slide;
-    let uid = st.uid;
-    let current = st.current_slide().map(|s| s.notes_text()).unwrap_or_default();
+    let (idx, uid) = (st.selection.slide, st.uid);
+    // Save an edited draft once the field has lost focus or another slide is shown (before
+    // anything reloads it), to the slide it was written on.
+    let id = egui::Id::new("notes_edit");
+    let focused = ui.ctx().memory(|m| m.has_focus(id));
+    if app.notes_buf.2.edited && (!focused || app.notes_buf.0 != uid || app.notes_buf.1 != idx) {
+        app.notes_buf.2.edited = false;
+        if app.notes_buf.0 == uid {
+            let _ = app.run("slide.notes", json!({"body": app.notes_buf.2.body, "index": app.notes_buf.1}));
+        }
+    }
+    let notes = app.session.active().and_then(|st| st.current_slide()).map(|s| s.notes.clone()).unwrap_or_default();
     egui::Panel::bottom("notes")
         .resizable(true)
         .default_size(app.ui.notes_height)
@@ -128,28 +137,19 @@ pub fn notes_pane(app: &mut SlideApp, ui: &mut Ui) {
             let rect = ui.max_rect();
             ui.painter()
                 .line_segment([pos2(rect.min.x - 8.0, rect.min.y - 6.0), pos2(rect.max.x + 8.0, rect.min.y - 6.0)], Stroke::new(1.0, t.separator));
-            // Keep a local buffer per slide; commit when it changes and the field loses focus.
-            if app.notes_buf.0 != uid || app.notes_buf.1 != idx {
-                app.notes_buf = (uid, idx, current.clone());
+            // Keep a local draft per slide, following the notes while the field isn't focused.
+            if app.notes_buf.0 != uid || app.notes_buf.1 != idx || (!focused && app.notes_buf.2.body != notes) {
+                app.notes_buf = (uid, idx, crate::notes::Draft::new(&notes));
             }
-            let id = egui::Id::new("notes_edit");
-            let focused = ui.ctx().memory(|m| m.has_focus(id));
-            if !focused && app.notes_buf.2 != current {
-                app.notes_buf.2 = current.clone();
-            }
-            let mut buf = app.notes_buf.2.clone();
-            let r = ui.add(
-                egui::TextEdit::multiline(&mut buf)
-                    .id(id)
-                    .hint_text("Click to add notes")
-                    .frame(egui::Frame::NONE)
-                    .desired_width(f32::INFINITY)
-                    .desired_rows(2)
-                    .font(theme::font(13.0)),
-            );
-            app.notes_buf.2 = buf.clone();
-            if r.lost_focus() && buf != current {
-                let _ = app.run("slide.notes", json!({"text": buf, "index": idx}));
+            let mut draft = app.notes_buf.2.clone();
+            let look = crate::notes::Look { size: 13.0, color: None };
+            let r = crate::notes::editor(ui, &mut draft, &look, |e| {
+                e.id(id).hint_text("Click to add notes").frame(egui::Frame::NONE).desired_width(f32::INFINITY).desired_rows(2)
+            });
+            if r.lost_focus() && draft.edited {
+                draft.edited = false;
+                let _ = app.run("slide.notes", json!({"body": draft.body, "index": idx}));
             }
+            app.notes_buf.2 = draft;
         });
 }
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1d87c9ac..cffee35c 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (formatted speaker notes) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -61,7 +61,7 @@ the round trip even though DeckCraft doesn't model it.
 | Presentation, slide size, sections (p14), custom shows | yes | yes | |
 | Slide masters, layouts, placeholders and inheritance | yes | yes | |
 | Themes: colour, font (Latin/EA/CS), effect schemes, background styles | yes | yes | Unknown theme parts kept |
-| Notes slides and notes master | yes | yes | No notes-master editing view |
+| Notes slides and notes master | yes | yes | Notes keep their run and paragraph formatting (bold, italic, underline, size, levels, indents, bullets), shown and kept when edited in the notes pane and Notes Page (`crates/pptx/tests/notes.rs`). PDF notes pages print them as plain text; levels and bullets inherited from a custom notes master aren't shown; no notes-master editing view |
 | Handout master | no | no | |
 | Shapes: preset geometry (~150 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in `crates/geom/src/preset.rs` |
 | Fills: solid, gradient, picture (stretch/tile/crop), pattern, group | yes | yes | |
@@ -99,4 +99,5 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Speaker notes: formatting shown in the notes pane and Notes Page and kept when they are edited |
 | 2026-10-10 | major | Created from PowerPoint 16.113.4's `CFBundleDocumentTypes`, `crates/pptx` reader/writer and tests, and the open round-trip issues |

From f033c76913a271944b9afb895d161b420b8dcc66 Mon Sep 17 00:00:00 2001
From: Hevar Hemin <hevarh@gmail.com>
Date: Sun, 11 Oct 2026 22:28:45 +0300
Subject: [PATCH 023/376] Bidi: auto-detect RTL paragraph direction and keep
 typing caret advancing smoothly

When typing in Kurdish, Arabic or Hebrew in a new document or text shape, default
paragraph direction (props.rtl: None) was resolving to LTR. In an LTR
paragraph, visual reordering pinned newly typed characters and the caret to the
left margin, resetting to the start of the line with every keystroke and jumping on
space characters due to UAX #9 rule L1.

- Add first_strong_is_rtl() in deckcraft-model following UAX #9 rules P2/P3.
- Auto-resolve unassigned paragraph direction to RTL in shape_para layout when the
  paragraph starts with an RTL script, defaulting alignment to Align::Right.
- Auto-promote paragraph to RTL (props.rtl = Some(true), props.align = Some(Align::Right))
  when typing or inserting text starting with an RTL character.
- Add regression tests in deckcraft-model, deckcraft-text, and deckcraft-engine.
---
 crates/engine/src/cmd/text.rs | 22 +++++++++-
 crates/engine/src/tests.rs    | 47 +++++++++++++++++++-
 crates/model/src/bidi.rs      | 81 +++++++++++++++++++++++++++++++++++
 crates/model/src/lib.rs       |  2 +
 crates/text/src/lib.rs        |  7 ++-
 crates/text/src/tests.rs      | 13 ++++++
 6 files changed, 168 insertions(+), 4 deletions(-)
 create mode 100644 crates/model/src/bidi.rs

diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 48be3a51..e09bb8d9 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -4,7 +4,7 @@ use std::sync::Arc;
 
 use deckcraft_model::edit::{self as ed, Pos};
 use deckcraft_model::resolve::{self, Ctx};
-use deckcraft_model::text::{AutoFit, Hyperlink, Run, RunKind, RunProps, TextBody};
+use deckcraft_model::text::{Align, AutoFit, Hyperlink, Run, RunKind, RunProps, TextBody};
 use deckcraft_model::{Presentation, ShapeId, ShapeKind};
 use serde_json::{Value, json};
 
@@ -232,12 +232,26 @@ pub(crate) fn insert_text(s: &mut Session, text: &str, props: Option<RunProps>)
         let c = ed::insert(body, at, &text, props);
         t.anchor = c;
         t.caret = c;
+        for pi in at.0..=c.0 {
+            if let Some(para) = body.paragraphs.get_mut(pi) {
+                promote_rtl_if_needed(para);
+            }
+        }
         c
     })?;
     autocorrect(s)?;
     Ok(json!({"caret": [pos.0, pos.1]}))
 }
 
+fn promote_rtl_if_needed(para: &mut deckcraft_model::text::Paragraph) {
+    if para.props.rtl.is_none() && deckcraft_model::bidi::first_strong_is_rtl(&para.text()) {
+        para.props.rtl = Some(true);
+        if para.props.align.is_none() {
+            para.props.align = Some(Align::Right);
+        }
+    }
+}
+
 /// Typing right after a hyperlink doesn't extend it (as in PowerPoint): at the end of a linked
 /// run, the props to type with are the run's without the link. `None` elsewhere.
 fn unlinked_at_link_end(body: &TextBody, at: Pos) -> Option<RunProps> {
@@ -314,6 +328,11 @@ pub(crate) fn paste_body(s: &mut Session, src: &TextBody) -> Result<Value> {
         let c = ed::insert_body(body, at, src);
         t.anchor = c;
         t.caret = c;
+        for pi in at.0..=c.0 {
+            if let Some(para) = body.paragraphs.get_mut(pi) {
+                promote_rtl_if_needed(para);
+            }
+        }
         c
     })?;
     Ok(json!({"caret": [pos.0, pos.1]}))
@@ -518,6 +537,7 @@ fn set(s: &mut Session, p: &Value) -> Result<Value> {
                 para.level = *lv;
                 para.props = pp.clone();
             }
+            promote_rtl_if_needed(para);
             for r in &mut para.runs {
                 r.props = keep.clone();
             }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..31365ca0 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -406,7 +406,7 @@ fn right_to_left_paragraphs() {
     let mut s = session();
     let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
     s.execute("text.edit", &json!({"id": title})).unwrap();
-    s.execute("text.insert", &json!({"text": "سنة 2024 (Retrait) فقط"})).unwrap();
+    s.execute("text.insert", &json!({"text": "Year 2024 (Retrait) only"})).unwrap();
     s.execute("format.rtl", &json!({})).unwrap();
     let para = |s: &Session| s.doc().unwrap().current_slide().unwrap().shapes[0].text.as_ref().unwrap().paragraphs[0].props.clone();
     assert_eq!(para(&s).rtl, Some(true));
@@ -426,6 +426,51 @@ fn right_to_left_paragraphs() {
     assert_eq!(para(&s).rtl, Some(true));
 }
 
+#[test]
+fn typing_kurdish_or_arabic_auto_detects_rtl_and_advances_caret_smoothly() {
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+    s.execute("text.edit", &json!({"id": title})).unwrap();
+
+    let mut first_x = None;
+    let mut last_x = 0.0;
+
+    // Type Kurdish sentence character-by-character: "من ناوم هێڤاره"
+    for ch in ["م", "ن", " ", "ن", "ا", "و", "م", " ", "ه", "ێ", "ڤ", "ا", "ر", "ه"] {
+        s.execute("text.insert", &json!({"text": ch})).unwrap();
+        let st = s.doc().unwrap();
+        let t = st.selection.text.as_ref().unwrap();
+        let l = super::cmd::text::layout_for(st, t).unwrap();
+        let (cx, ..) = l.caret(deckcraft_text::Pos { para: t.caret.0, ch: t.caret.1 }).unwrap();
+
+        if first_x.is_none() {
+            first_x = Some(cx);
+        }
+        last_x = cx;
+
+        // Caret must remain near the right margin (e.g. > 400.0 pt in title placeholder)
+        // and must NOT jump back to the left margin (e.g. ~7.2 pt).
+        assert!(cx > 400.0, "caret should not jump to left margin: {cx}");
+    }
+
+    // Caret advances leftwards overall as text is appended
+    assert!(last_x < first_x.unwrap(), "caret should advance leftwards: last={last_x} first={:?}", first_x);
+    let para = s.doc().unwrap().current_slide().unwrap().shapes[0].text.as_ref().unwrap().paragraphs[0].props.clone();
+    assert_eq!(para.rtl, Some(true), "auto-detected as RTL");
+    assert_eq!(para.align, Some(deckcraft_model::text::Align::Right), "aligned right");
+}
+
+#[test]
+fn explicit_ltr_override_is_preserved_when_typing_rtl() {
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+    s.execute("text.edit", &json!({"id": title})).unwrap();
+    s.execute("format.rtl", &json!({"on": false})).unwrap();
+    s.execute("text.insert", &json!({"text": "مرحبا"})).unwrap();
+    let para = s.doc().unwrap().current_slide().unwrap().shapes[0].text.as_ref().unwrap().paragraphs[0].props.clone();
+    assert_eq!(para.rtl, Some(false), "user explicit LTR is preserved");
+}
+
 #[test]
 fn header_footer_fixed_date_is_the_slides_own_text() {
     use deckcraft_model::text::RunKind;
diff --git a/crates/model/src/bidi.rs b/crates/model/src/bidi.rs
new file mode 100644
index 00000000..0b113522
--- /dev/null
+++ b/crates/model/src/bidi.rs
@@ -0,0 +1,81 @@
+//! Bidirectional text helpers (UAX #9).
+//!
+//! Follows Unicode Bidirectional Algorithm (UAX #9 rules P2 and P3) for paragraph
+//! base direction auto-detection.
+
+/// Does the first strong directional character in `text` belong to a right-to-left script?
+///
+/// Follows UAX #9 rules P2 and P3: characters with strong bidirectional class AL or R
+/// (Arabic, Hebrew, Syriac, Thaana…) give `true`; strong L characters (Latin, Greek,
+/// Cyrillic, CJK…) give `false`. Neutral, weak, and whitespace characters are skipped.
+pub fn first_strong_is_rtl(text: &str) -> bool {
+    for c in text.chars() {
+        if c == '\u{200F}' {
+            // Right-to-Left Mark (RLM)
+            return true;
+        }
+        if c == '\u{200E}' {
+            // Left-to-Right Mark (LRM)
+            return false;
+        }
+        if c.is_alphabetic() {
+            return is_rtl_script(c);
+        }
+    }
+    false
+}
+
+/// Helper checking if a char belongs to standard RTL Unicode blocks.
+pub fn is_rtl_script(c: char) -> bool {
+    matches!(
+        c,
+        '\u{0590}'..='\u{05FF}' // Hebrew
+        | '\u{0600}'..='\u{06FF}' // Arabic
+        | '\u{0700}'..='\u{074F}' // Syriac
+        | '\u{0750}'..='\u{077F}' // Arabic Supplement
+        | '\u{0780}'..='\u{07BF}' // Thaana
+        | '\u{0870}'..='\u{089F}' // Arabic Extended-B
+        | '\u{08A0}'..='\u{08FF}' // Arabic Extended-A
+        | '\u{FB1D}'..='\u{FB4F}' // Hebrew Presentation Forms
+        | '\u{FB50}'..='\u{FDFF}' // Arabic Presentation Forms-A
+        | '\u{FE70}'..='\u{FEFE}' // Arabic Presentation Forms-B
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn detects_arabic_and_kurdish() {
+        assert!(first_strong_is_rtl("مرحبا"));
+        assert!(first_strong_is_rtl("من ناوم هێڤاره"));
+        assert!(first_strong_is_rtl("سلام"));
+    }
+
+    #[test]
+    fn detects_hebrew() {
+        assert!(first_strong_is_rtl("שלום"));
+    }
+
+    #[test]
+    fn detects_latin_as_not_rtl() {
+        assert!(!first_strong_is_rtl("Hello"));
+        assert!(!first_strong_is_rtl("DeckCraft"));
+    }
+
+    #[test]
+    fn skips_neutrals_numbers_and_whitespace() {
+        assert!(first_strong_is_rtl("  123 مرحبا"));
+        assert!(first_strong_is_rtl("... (2024) سنة"));
+        assert!(!first_strong_is_rtl("  123 Hello"));
+        assert!(!first_strong_is_rtl(""));
+        assert!(!first_strong_is_rtl("   12345 "));
+    }
+
+    #[test]
+    fn honours_directional_marks() {
+        assert!(first_strong_is_rtl("\u{200F}Hello"));
+        assert!(!first_strong_is_rtl("\u{200E}مرحبا"));
+    }
+}
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 6940fa4b..f8129f69 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -8,6 +8,7 @@
 #![forbid(unsafe_code)]
 
 pub mod anim;
+pub mod bidi;
 pub mod chart;
 pub mod defaults;
 pub mod edit;
@@ -24,6 +25,7 @@ pub use deckcraft_geom::{Rect, Size, Xfrm};
 use serde::{Deserialize, Serialize};
 
 pub use anim::{AnimClass, AnimStart, Animation, Transition};
+pub use bidi::{first_strong_is_rtl, is_rtl_script};
 pub use chart::Chart;
 pub use style::{ColorBase, ColorRef, Effects, Fill, Line, ShapeStyle};
 pub use table::{Cell, Table};
diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index 225f4afb..a14f5ad7 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -415,8 +415,11 @@ fn shape_para(ctx: &Ctx, shape: &Shape, body: &TextBody, pi: usize, scale: f64,
             rtl: false,
         };
     };
-    let props = resolve::para(ctx, shape, para);
-    let rtl = props.rtl.unwrap_or(false);
+    let mut props = resolve::para(ctx, shape, para);
+    let rtl = props.rtl.unwrap_or_else(|| deckcraft_model::bidi::first_strong_is_rtl(&para.text()));
+    if rtl && para.props.align.is_none() {
+        props.align = Some(Align::Right);
+    }
     let mut styles: Vec<Style> = vec![];
     let mut faces: Vec<Arc<FontFace>> = vec![];
     // The logical paragraph: its text and each character's style.
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index f3d5db5d..aa8c7af8 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -215,6 +215,19 @@ fn rtl_left_and_center_alignment() {
     assert!((c - (l.inner.x0 + l.inner.x1) / 2.0).abs() < 0.5);
 }
 
+#[test]
+fn layout_auto_detects_rtl_from_first_strong_character() {
+    let (p, mut sh) = bidi_setup(vec![Run::new("من ناوم هێڤاره")], 400.0, false, Align::Left);
+    // Leave props.rtl as None and props.align as None (unassigned)
+    sh.text.as_mut().unwrap().paragraphs[0].props.rtl = None;
+    sh.text.as_mut().unwrap().paragraphs[0].props.align = None;
+    let l = lay(&p, &sh, 400.0, 300.0);
+    let line = &l.lines[0];
+    assert!(line.rtl, "line should auto-detect as RTL");
+    // Line aligns to the right edge
+    assert!(line.extent.1 > 350.0, "extent right: {}", line.extent.1);
+}
+
 #[test]
 fn bidi_caret_stops_round_trip_through_hit_testing() {
     for rtl in [true, false] {

From b14cf1da70428e7019a49cbed2ad8cb7d39445ca Mon Sep 17 00:00:00 2001
From: Fabio Lussi <198260595+itrycodinganditsbad@users.noreply.github.com>
Date: Sun, 11 Oct 2026 22:25:06 +0200
Subject: [PATCH 024/376] Windows: compile DX12 shaders with FXC

wgpu's default DX12 compiler (Auto) loads whichever dxcompiler.dll the DLL
search path finds. DeckCraft ships none, and without a matching dxil.dll the
unsigned-DXIL warning fails wgpu's indirect-validation pipeline, the device
is lost and the app exits before the first frame. Pin the compiler to FXC,
which is part of Windows; WGPU_DX12_COMPILER still overrides it.

Fixes #153

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 README.md                      |  4 +++
 apps/deckcraft/src/graphics.rs | 56 +++++++++++++++++++++++++++++++---
 apps/deckcraft/src/main.rs     |  4 +--
 3 files changed, 57 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index f25aef2d..797054a1 100644
--- a/README.md
+++ b/README.md
@@ -190,6 +190,10 @@ Remove-Item Env:WGPU_BACKEND                     # restore the default for later
 An explicit `gl` override can bring the driver crash back on affected systems. The macOS, Linux
 and web backend defaults are unchanged.
 
+DirectX 12 shaders are compiled with FXC, which is part of Windows, so no `dxcompiler.dll` or
+`dxil.dll` is needed ("Parent device is lost" at start, #153). `$env:WGPU_DX12_COMPILER = "dxc"`
+(or `"auto"`) selects wgpu's DXC handling again for troubleshooting.
+
 ### macOS
 
 | Build | File | Notes |
diff --git a/apps/deckcraft/src/graphics.rs b/apps/deckcraft/src/graphics.rs
index ccd0c459..fc054c06 100644
--- a/apps/deckcraft/src/graphics.rs
+++ b/apps/deckcraft/src/graphics.rs
@@ -1,10 +1,14 @@
 //! Windows graphics instance configuration, applied before wgpu can initialize any driver.
 
-use eframe::{NativeOptions, egui_wgpu::WgpuSetup, wgpu::Backends};
+use eframe::{
+    NativeOptions,
+    egui_wgpu::WgpuSetup,
+    wgpu::{Backends, Dx12Compiler},
+};
 
-/// Restrict the wgpu instance to DirectX 12 unless `backend_override` (normally
-/// `Backends::from_env()`, i.e. `WGPU_BACKEND`) names other backends.
-pub fn configure(options: &mut NativeOptions, backend_override: Option<Backends>) {
+/// Default to DirectX 12 with FXC before creating the wgpu instance. Explicit
+/// `WGPU_BACKEND` and `WGPU_DX12_COMPILER` choices, read by the caller, take precedence.
+pub fn configure(options: &mut NativeOptions, backend_override: Option<Backends>, compiler_override: Option<Dx12Compiler>) {
     if let WgpuSetup::CreateNew(create) = &mut options.wgpu_options.wgpu_setup {
         // eframe's default includes GL. Creating that backend can crash inside AMD's
         // atio6axx.dll before adapter selection or any Rust error handling runs, so the
@@ -12,6 +16,16 @@ pub fn configure(options: &mut NativeOptions, backend_override: Option<Backends>
         // out of the instance avoids it. This matches the verified WGPU_BACKEND=dx12
         // workaround without mutating process environment variables.
         create.instance_descriptor.backends = backend_override.unwrap_or(Backends::DX12);
+        // Auto loads whichever dxcompiler.dll the DLL search path finds; DeckCraft ships
+        // none, and without a matching dxil.dll the unsigned-DXIL warning fails wgpu's
+        // indirect-validation pipeline and loses the device before the first frame
+        // (issue #153). FXC uses the compiler that is part of Windows.
+        create.instance_descriptor.backend_options.dx12.shader_compiler = compiler_override.unwrap_or(Dx12Compiler::Fxc);
+        log::info!(
+            "Windows graphics: backends={:?}, DX12 compiler={:?}",
+            create.instance_descriptor.backends,
+            create.instance_descriptor.backend_options.dx12.shader_compiler
+        );
     }
 }
 
@@ -21,7 +35,7 @@ mod tests {
 
     fn configured_backends(backend_override: Option<Backends>) -> Backends {
         let mut options = NativeOptions::default();
-        configure(&mut options, backend_override);
+        configure(&mut options, backend_override, None);
         let WgpuSetup::CreateNew(create) = options.wgpu_options.wgpu_setup else {
             panic!("default native options must create a wgpu instance");
         };
@@ -38,6 +52,38 @@ mod tests {
         assert_eq!(configured_backends(None), Backends::DX12);
     }
 
+    #[test]
+    fn windows_default_uses_fxc_instead_of_searching_for_dxc() {
+        let mut options = NativeOptions::default();
+        if let WgpuSetup::CreateNew(create) = &mut options.wgpu_options.wgpu_setup {
+            // Auto can find an unrelated DXC without its matching DXIL runtime (issue #153).
+            create.instance_descriptor.backend_options.dx12.shader_compiler = Dx12Compiler::Auto;
+        }
+        configure(&mut options, None, None);
+        let WgpuSetup::CreateNew(create) = options.wgpu_options.wgpu_setup else {
+            panic!("default native options must create a wgpu instance");
+        };
+        assert!(matches!(create.instance_descriptor.backend_options.dx12.shader_compiler, Dx12Compiler::Fxc));
+    }
+
+    #[test]
+    fn explicit_compiler_override_is_preserved() {
+        for compiler in [Dx12Compiler::Fxc, Dx12Compiler::Auto, Dx12Compiler::DynamicDxc { dxc_path: "custom/dxcompiler.dll".into() }] {
+            let mut options = NativeOptions::default();
+            configure(&mut options, None, Some(compiler.clone()));
+            let WgpuSetup::CreateNew(create) = options.wgpu_options.wgpu_setup else {
+                panic!("default native options must create a wgpu instance");
+            };
+            match (compiler, create.instance_descriptor.backend_options.dx12.shader_compiler) {
+                (Dx12Compiler::Fxc, Dx12Compiler::Fxc) | (Dx12Compiler::Auto, Dx12Compiler::Auto) => {}
+                (Dx12Compiler::DynamicDxc { dxc_path: expected }, Dx12Compiler::DynamicDxc { dxc_path: actual }) => {
+                    assert_eq!(actual, expected);
+                }
+                (expected, actual) => panic!("compiler override changed from {expected:?} to {actual:?}"),
+            }
+        }
+    }
+
     #[test]
     fn explicit_backend_override_is_preserved() {
         for backends in [Backends::VULKAN, Backends::GL, Backends::DX12, Backends::VULKAN | Backends::DX12, Backends::empty()] {
diff --git a/apps/deckcraft/src/main.rs b/apps/deckcraft/src/main.rs
index 7b5e48bb..90981968 100644
--- a/apps/deckcraft/src/main.rs
+++ b/apps/deckcraft/src/main.rs
@@ -190,9 +190,9 @@ fn main() -> eframe::Result {
             b.with_x11();
         }));
     }
-    // Before eframe creates the wgpu instance: default Windows to DirectX 12 only (see graphics.rs).
+    // Before eframe creates the wgpu instance: default Windows to DirectX 12 with FXC (see graphics.rs).
     #[cfg(target_os = "windows")]
-    graphics::configure(&mut options, eframe::wgpu::Backends::from_env());
+    graphics::configure(&mut options, eframe::wgpu::Backends::from_env(), eframe::wgpu::Dx12Compiler::from_env());
     eframe::run_native(
         "DeckCraft",
         options,

From c871c5f634fdedfa6e055c1a6d832d1e808d1913 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mat=C3=BA=C5=A1=20Laco?= <laco.matus@gmail.com>
Date: Sun, 11 Oct 2026 21:44:50 +0200
Subject: [PATCH 025/376] =?UTF-8?q?Export:=20animated=20GIF=20of=20the=20d?=
 =?UTF-8?q?eck=20(Export=E2=80=A6=20dialog,=20CLI,=20MCP)=20(#171)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

There was no way to turn a presentation into an animated GIF. file.export now writes one: format
`gif` (or a .gif path), one frame per slide drawn by the slide renderer and shown for
secondsPerSlide, encoded with the `image` crate's GIF encoder (already a dependency, no new
crates) with a 256-colour palette per frame: exact when a slide has 256 colours or fewer,
NeuQuant otherwise. Slides are composited onto white.

Options: width (small 640, medium 960 (default), large 1280, extraLarge 1920, or 16-3840 px; the
height follows the slide's aspect ratio, no side over 3840), secondsPerSlide (0.1-600, default 5,
written in GIF hundredths), loop (forever by default, or once: no NETSCAPE2.0 block), slides (a
list of indices, in play order) and includeHidden (hidden slides are skipped by default).
Out-of-range or wrongly typed values, NaN and infinities are BadParams errors, never panics; at
most 500 frames and 200 million pixels in total, checked before anything is rendered.

- Engine: crates/engine/src/gif_export.rs (options, frame list, size, encoder);
  cmd::file::gif_bytes, save_bytes("gif"), format_for_path(".gif").
- UI: the Export… dialog (Command palette; the app has no File menu yet) gets "Animated GIF (.gif)" with Size, Seconds per slide, From/To slide,
  Loop forever and Include hidden slides; an invalid range or value keeps the dialog open with a
  message. The web build downloads the bytes (image/gif).
- CLI: convert IN OUT.gif, run --export OUT.gif --export-params JSON; usage lists the format and
  options.
- MCP: the export tool lists gif and width/secondsPerSlide/loop (slides and includeHidden now
  apply to PDF and GIF).
- Docs: file-format parity GIF row, gaps (video export remains), parity checklist row M -> P
  (P2 breadth 36% -> 37%, overall 79%), control protocol, MCP, README, ROADMAP progress log.

Transitions and build animations are not animated in the GIF (tracked with video export).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 README.md                       |   2 +-
 ROADMAP.md                      |   6 +-
 apps/deckcraft-cli/src/main.rs  |  67 ++++-
 apps/deckcraft-web/src/web.rs   |   1 +
 crates/engine/src/cmd/file.rs   |  24 +-
 crates/engine/src/gif_export.rs | 421 ++++++++++++++++++++++++++++++++
 crates/engine/src/lib.rs        |   1 +
 crates/mcp/src/tests.rs         |  26 ++
 crates/mcp/src/tools.rs         |  19 +-
 crates/ui-egui/src/dialogs.rs   | 144 ++++++++++-
 docs/control-protocol.md        |   2 +-
 docs/file-format-parity.md      |   5 +-
 docs/gaps.md                    |  13 +-
 docs/mcp.md                     |   4 +-
 docs/parity-checklist.md        |   8 +-
 docs/target-app-parity.md       |   5 +-
 16 files changed, 714 insertions(+), 34 deletions(-)
 create mode 100644 crates/engine/src/gif_export.rs

diff --git a/README.md b/README.md
index f25aef2d..d6bd749d 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@ Today it can:
 - **Present**: transitions (including Morph), entrance/emphasis/exit and motion-path animations,
   by-paragraph builds, full-screen slide show, presenter view, pen, rehearse timings, media playback.
 - **Exchange files**: open and save PowerPoint `.pptx`, export PDF (slides, notes pages, handouts
-  with selectable text), PNG/JPEG and outlines. Unsaved work is kept by AutoRecover.
+  with selectable text), PNG/JPEG, an animated GIF of the deck and outlines. Unsaved work is kept by AutoRecover.
 - **Automate**: 200+ commands with undo, all scriptable from the CLI, a JSON control channel and an
   MCP server for AI agents.
 
diff --git a/ROADMAP.md b/ROADMAP.md
index 801ddd84..7f5de626 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export in the progress log, #171; P2 breadth 36% → 37%; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -14,7 +14,7 @@ format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and av
 
 | | Value | Kind |
 |---|---|---|
-| **Feature breadth** | **79%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 36%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
+| **Feature breadth** | **79%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 37%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
 | Menu-bar coverage | 59% of 217 app-specific PowerPoint menu items matched by name (lower bound) | measured: script over the PowerPoint menu dump and the 226 commands |
 | **Ready for real work** | **~55%** | estimated: weighted dimensions below |
 | Mainstream practitioner | ~53% | estimated: weekly-use areas × discounts for interaction (×0.92), stability (×0.92) and `.pptx` exchange (×0.88), [method](docs/target-app-parity.md#mainstream-practitioner-and-essentials-user) |
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-11 | Animated GIF export of the deck: the Export… dialog (Animated GIF), `file.export` format `gif`, CLI and MCP (#171) |
 | 2026-10-10 | Progress docs restructured to the craftrules standard; full re-measure (breadth 79%, ready ~55%, mainstream ~53%, essentials ~62%, alpha). Landed: Animation Painter (#54), Morph geometry outlines (#27), animated GIF playback (#39), hyperlink colour and following links in the show (#37, #45), date fields in their own format (#36), flipped shapes keep readable text (#35), show transition fix (#46), start screen from the Home button (#49), MCP export lists PDF (#65), OmaStore manifest (#57) |
 | 2026-10-09 | v0.4.0 released. UAX #9 bidi and Arabic shaping (#4), Morph with Words and Characters (#5), tables grow to fit and PDF cell text (#14), rotating log file (#7), DX12 default on Windows (#16), H.264/HEVC overflow hardening (#2), PPTX sniffing anywhere in the zip (#19) |
 | 2026-10-08 | v0.2.0 and v0.3.0 released: Windows arm64, Flatpak aarch64, AppImage zsync updates, branded DMG |
@@ -139,6 +140,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Progress log: animated GIF export (#171); P2 breadth 36% → 37%, overall breadth stays 79% |
 | 2026-10-10 | minor | Readiness-by-audience table with hours to ~95% for full, mainstream and essentials |
 | 2026-10-10 | minor | Added mainstream practitioner (~53%) and essentials user (~62%); features recomputed from written area weights, ready ~56% → ~55% |
 | 2026-10-10 | minor | Stage checked against the new core-workflow gate: passes, stays alpha |
diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index c450393f..0b99dbad 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -3,8 +3,8 @@
 //! ```text
 //! deckcraft-cli info FILE                       # slides, titles, layouts (JSON)
 //! deckcraft-cli render (FILE | --sample) [--slide N | --all] [--scale S] OUT.png|OUT_DIR
-//! deckcraft-cli convert IN OUT                  # .deckcraft ⇄ .pptx, outline .txt, .png (first slide)
-//! deckcraft-cli run [--in FILE | --sample] [--cmd ID[=JSON]]... [--save OUT] [--export OUT] [--print]
+//! deckcraft-cli convert IN OUT                  # .deckcraft ⇄ .pptx, outline .txt, .pdf, .png (first slide), .gif (animated)
+//! deckcraft-cli run [--in FILE | --sample] [--cmd ID[=JSON]]... [--save OUT] [--export OUT [--export-params JSON]] [--print]
 //! deckcraft-cli commands [FILTER]               # list commands (JSON)
 //! deckcraft-cli describe ID                     # one command
 //! deckcraft-cli app [--port PORT] COMMAND [JSON] | --method METHOD [JSON]   # drive the running app
@@ -35,12 +35,17 @@ macro_rules! outln {
 const USAGE: &str = "usage: deckcraft-cli info FILE
        deckcraft-cli render (FILE | --sample) [--slide N | --all] [--scale S] [--edit] OUT
        deckcraft-cli convert IN OUT
-       deckcraft-cli run [--in FILE | --sample] [--cmd ID[=JSON]]... [--save OUT] [--export OUT] [--print]
+       deckcraft-cli run [--in FILE | --sample] [--cmd ID[=JSON]]... [--save OUT] [--export OUT [--export-params JSON]] [--print]
        deckcraft-cli commands [FILTER]
        deckcraft-cli describe COMMAND
        deckcraft-cli app [--port PORT] COMMAND [JSON] | --method METHOD [JSON]
        deckcraft-cli mcp [--connect PORT] [--sample]
-       deckcraft-cli links | --version";
+       deckcraft-cli links | --version
+
+Export formats follow OUT's extension: .png .jpg .pdf .pptx .txt .deckcraft .gif (animated, one
+frame per slide). --export-params passes file.export options, e.g. for a GIF
+'{\"width\": \"large\", \"secondsPerSlide\": 3, \"loop\": false, \"slides\": [0, 1, 2]}'
+(width: px 16-3840 or small|medium|large|extraLarge; see `deckcraft-cli describe file.export`).";
 
 fn main() -> ExitCode {
     let args: Vec<String> = std::env::args().skip(1).collect();
@@ -168,6 +173,8 @@ fn convert(args: &[String]) -> Result<(), String> {
     let fmt = deckcraft_engine::cmd::file::format_for_path(out);
     let r = if matches!(fmt, "png" | "jpeg") {
         s.execute("file.export", &json!({"path": out, "slide": 0}))
+    } else if fmt == "gif" {
+        s.execute("file.export", &json!({"path": out}))
     } else {
         s.execute("file.saveAs", &json!({"path": out}))
     };
@@ -182,6 +189,7 @@ fn run(args: &[String]) -> Result<(), String> {
     let mut cmds = vec![];
     let mut save = None;
     let mut export = None;
+    let mut export_params = json!({});
     let mut print = false;
     let mut it = args.iter();
     while let Some(a) = it.next() {
@@ -191,6 +199,13 @@ fn run(args: &[String]) -> Result<(), String> {
             "--cmd" => cmds.push(it.next().cloned().ok_or("--cmd needs ID[=JSON]")?),
             "--save" => save = Some(it.next().cloned().ok_or("--save needs a path")?),
             "--export" => export = Some(it.next().cloned().ok_or("--export needs a path")?),
+            "--export-params" => {
+                let j = it.next().ok_or("--export-params needs a JSON object")?;
+                export_params = serde_json::from_str::<Value>(j).map_err(|e| format!("--export-params: bad JSON: {e}"))?;
+                if !export_params.is_object() {
+                    return Err("--export-params must be a JSON object".into());
+                }
+            }
             "--print" => print = true,
             other => return Err(format!("unknown option `{other}`")),
         }
@@ -211,7 +226,10 @@ fn run(args: &[String]) -> Result<(), String> {
         s.execute("file.saveAs", &json!({"path": p})).map_err(|e| e.to_string())?;
     }
     if let Some(p) = export {
-        s.execute("file.export", &json!({"path": p})).map_err(|e| e.to_string())?;
+        export_params["path"] = json!(p);
+        s.execute("file.export", &export_params).map_err(|e| e.to_string())?;
+    } else if export_params != json!({}) {
+        return Err("--export-params needs --export OUT".into());
     }
     Ok(())
 }
@@ -278,3 +296,42 @@ fn mcp(args: &[String]) -> Result<(), String> {
     let stdin = std::io::stdin();
     server.serve(stdin.lock(), std::io::stdout()).map_err(|e| e.to_string())
 }
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used)]
+
+    use super::*;
+
+    fn args(a: &[&str]) -> Vec<String> {
+        a.iter().map(|s| s.to_string()).collect()
+    }
+
+    /// `run --export OUT.gif --export-params JSON` and `convert IN OUT.gif` write animated GIFs.
+    #[test]
+    fn exports_an_animated_gif() {
+        let dir = std::env::temp_dir().join(format!("deckcraft-cli-gif-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let gif = dir.join("sample.gif").to_string_lossy().to_string();
+        let deck = dir.join("sample.deckcraft").to_string_lossy().to_string();
+        let params = r#"{"width": "small", "secondsPerSlide": 2, "loop": false, "slides": [0, 1]}"#;
+        run(&args(&["--sample", "--save", &deck, "--export", &gif, "--export-params", params])).unwrap();
+        let bytes = std::fs::read(&gif).unwrap();
+        assert!(bytes.starts_with(b"GIF89a"));
+        assert_eq!(u16::from_le_bytes([bytes[6], bytes[7]]), 640, "small = 640 px wide");
+        assert!(!bytes.windows(11).any(|w| w == b"NETSCAPE2.0"), "play once: no loop block");
+
+        let gif2 = dir.join("converted.gif").to_string_lossy().to_string();
+        convert(&args(&[&deck, &gif2])).unwrap();
+        let bytes = std::fs::read(&gif2).unwrap();
+        assert!(bytes.starts_with(b"GIF89a") && bytes.windows(11).any(|w| w == b"NETSCAPE2.0"), "loops forever by default");
+
+        // Bad options are errors, not panics.
+        let bad = dir.join("bad.gif").to_string_lossy().to_string();
+        assert!(run(&args(&["--sample", "--export", &bad, "--export-params", r#"{"width": 1e9}"#])).is_err());
+        assert!(run(&args(&["--sample", "--export", &bad, "--export-params", "[1]"])).is_err());
+        assert!(run(&args(&["--sample", "--export-params", "{}"])).is_ok());
+        assert!(run(&args(&["--sample", "--export-params", r#"{"width": 64}"#])).is_err());
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+}
diff --git a/apps/deckcraft-web/src/web.rs b/apps/deckcraft-web/src/web.rs
index f0199a55..ccb62bff 100644
--- a/apps/deckcraft-web/src/web.rs
+++ b/apps/deckcraft-web/src/web.rs
@@ -168,6 +168,7 @@ fn mime_for(name: &str) -> &'static str {
         Some("png") => "image/png",
         Some("jpg" | "jpeg") => "image/jpeg",
         Some("pdf") => "application/pdf",
+        Some("gif") => "image/gif",
         Some("txt") => "text/plain",
         Some("pptx") => "application/vnd.openxmlformats-officedocument.presentationml.presentation",
         Some("deckcraft") => "application/zip",
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index 55aac8bd..44b637e2 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -15,7 +15,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!(noundo "file.saveAs", "Save As…", ["File"], Some("Cmd+Shift+S"), "{path, format?}", has_doc, save_as),
         cmd!(noundo "file.saveTemplate", "Save as Template…", ["File"], None, "{path}", has_doc, save_as),
         cmd!(query "file.saveBytes", "Save to Data", [], None, "{format?: deckcraft|pptx} → {data: base64}", has_doc, save_bytes_cmd),
-        cmd!(noundo "file.export", "Export…", ["File"], None, "{path, format: png|jpeg|pptx|deckcraft|outline|pdf, slide?: index, all?: bool, scale?: px per pt; pdf: layout?: slides|notes|handouts, perPage?: 1|2|3|4|6|9, dpi?, slides?: [index], includeHidden?, textLayer?, frame?}", has_doc, export),
+        cmd!(noundo "file.export", "Export…", ["File"], None, "{path, format: png|jpeg|pptx|deckcraft|outline|pdf|gif, slide?: index, all?: bool, scale?: px per pt; pdf: layout?: slides|notes|handouts, perPage?: 1|2|3|4|6|9, dpi?, slides?: [index], includeHidden?, textLayer?, frame?; gif: width?: px 16-3840 | small|medium|large|extraLarge, secondsPerSlide?: 0.1-600 (5), loop?: bool (true: forever), slides?: [index], includeHidden?} → {path, bytes} (gif: + frames, width, height, secondsPerSlide)", has_doc, export),
         cmd!(query "file.render", "Render Slide", [], None, "{slide?: index, scale?, edit?: bool} → {png: base64, width, height}", has_doc, render),
         cmd!(noundo "file.close", "Close", ["File"], Some("Cmd+W"), "{}", has_doc, close),
         cmd!(
@@ -104,12 +104,13 @@ fn open_bytes(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"document": i}))
 }
 
-/// Encode the presentation in `format` (`deckcraft`, `pptx`, `outline`).
+/// Encode the presentation in `format` (`deckcraft`, `pptx`, `outline`, `pdf`, `gif`).
 pub fn save_bytes(doc: &Presentation, format: &str) -> Result<Vec<u8>> {
     match format {
         "pptx" | "potx" | "ppsx" => deckcraft_pptx::export(doc).map_err(|e| EngineError::Other(e.to_string())),
         "outline" | "txt" => Ok(deckcraft_format::slides_to_outline(doc).into_bytes()),
         "pdf" => deckcraft_pdf::export(doc, &Default::default()).map_err(|e| EngineError::Other(e.to_string())),
+        "gif" => gif_bytes(doc, &Value::Null),
         _ => deckcraft_format::save(doc).map_err(|e| EngineError::Other(e.to_string())),
     }
 }
@@ -136,6 +137,11 @@ pub fn pdf_bytes(doc: &Presentation, p: &Value) -> Result<Vec<u8>> {
     deckcraft_pdf::export(doc, &pdf_options(p)).map_err(|e| EngineError::Other(e.to_string()))
 }
 
+/// Animated GIF bytes for `doc` with the options in `p` (see [`crate::gif_export::GifOptions::from_params`]).
+pub fn gif_bytes(doc: &Presentation, p: &Value) -> Result<Vec<u8>> {
+    Ok(crate::gif_export::encode(doc, &crate::gif_export::GifOptions::from_params(p)?)?.bytes)
+}
+
 pub fn format_for_path(path: &str) -> &'static str {
     let l = path.to_ascii_lowercase();
     if l.ends_with(".pptx") || l.ends_with(".potx") || l.ends_with(".ppsx") {
@@ -146,6 +152,8 @@ pub fn format_for_path(path: &str) -> &'static str {
         "jpeg"
     } else if l.ends_with(".pdf") {
         "pdf"
+    } else if l.ends_with(".gif") {
+        "gif"
     } else if l.ends_with(".txt") || l.ends_with(".md") {
         "outline"
     } else {
@@ -264,6 +272,18 @@ fn export(s: &mut Session, p: &Value) -> Result<Value> {
             write_file(&path, &bytes)?;
             Ok(json!({"path": path, "bytes": bytes.len()}))
         }
+        "gif" => {
+            let out = crate::gif_export::encode(&st.doc, &crate::gif_export::GifOptions::from_params(p)?)?;
+            write_file(&path, &out.bytes)?;
+            Ok(json!({
+                "path": path,
+                "bytes": out.bytes.len(),
+                "frames": out.frames,
+                "width": out.width,
+                "height": out.height,
+                "secondsPerSlide": f64::from(out.delay_cs) / 100.0,
+            }))
+        }
         other => {
             let bytes = save_bytes(&st.doc, other)?;
             write_file(&path, &bytes)?;
diff --git a/crates/engine/src/gif_export.rs b/crates/engine/src/gif_export.rs
new file mode 100644
index 00000000..da4f044f
--- /dev/null
+++ b/crates/engine/src/gif_export.rs
@@ -0,0 +1,421 @@
+//! Animated GIF of the deck (the Export… dialog; `file.export` with format `gif`).
+//!
+//! One frame per slide, drawn by the slide renderer and shown for `secondsPerSlide`. Every frame
+//! gets its own 256-colour palette (exact when the slide has 256 colours or fewer, NeuQuant
+//! otherwise), so a photo on one slide doesn't steal colours from the next. Transitions and
+//! build animations are not animated: a slide appears as it looks when its builds have finished.
+//!
+//! All parameters are hostile: sizes, delays and slide lists are checked against fixed bounds, and
+//! the total number of pixels encoded is capped, so a request can't exhaust memory or run for
+//! hours.
+
+use deckcraft_model::Presentation;
+use serde_json::Value;
+
+use crate::cmd::bad;
+use crate::{EngineError, Result};
+
+const CMD: &str = "file.export";
+
+/// Size presets, by frame width in pixels (16:9 slides: 640×360, 960×540, 1280×720, 1920×1080).
+pub const SIZE_PRESETS: [(&str, u32); 4] = [("small", 640), ("medium", 960), ("large", 1280), ("extraLarge", 1920)];
+/// Frame width when none is given (the `medium` preset).
+pub const DEFAULT_WIDTH: u32 = 960;
+pub const MIN_WIDTH: u32 = 16;
+pub const MAX_WIDTH: u32 = 3840;
+/// Longest frame side: a very tall slide is scaled down to fit.
+pub const MAX_SIDE: u32 = 3840;
+pub const DEFAULT_SECONDS: f64 = 5.0;
+/// GIF delays are in hundredths of a second; viewers treat delays under 0.02 s as 0.1 s anyway.
+pub const MIN_SECONDS: f64 = 0.1;
+pub const MAX_SECONDS: f64 = 600.0;
+pub const MAX_FRAMES: usize = 500;
+/// Cap on frames × width × height (≈ 96 Full HD frames or 480 frames at 960×540).
+pub const MAX_TOTAL_PIXELS: u64 = 200_000_000;
+/// NeuQuant sampling: 1 is slowest and best, 30 fastest; 10 is the usual balance.
+const QUANTIZER_SPEED: i32 = 10;
+
+/// What to export.
+#[derive(Clone, Debug, PartialEq)]
+pub struct GifOptions {
+    /// Frame width in pixels; the height follows the slide's aspect ratio.
+    pub width: u32,
+    pub seconds_per_slide: f64,
+    /// Loop forever (`true`) or play once.
+    pub loop_forever: bool,
+    /// Slide indices in play order (default: all).
+    pub slides: Option<Vec<usize>>,
+    /// Hidden slides are left out unless this is set.
+    pub include_hidden: bool,
+}
+
+impl Default for GifOptions {
+    fn default() -> Self {
+        GifOptions { width: DEFAULT_WIDTH, seconds_per_slide: DEFAULT_SECONDS, loop_forever: true, slides: None, include_hidden: false }
+    }
+}
+
+/// An encoded GIF and what is in it.
+#[derive(Clone, Debug)]
+pub struct GifOutput {
+    pub bytes: Vec<u8>,
+    pub frames: usize,
+    pub width: u32,
+    pub height: u32,
+    /// Per-frame delay in hundredths of a second, as written.
+    pub delay_cs: u16,
+}
+
+fn width_value(v: &Value) -> Result<u32> {
+    let err =
+        || bad(CMD, format!("`width` must be a whole number of pixels from {MIN_WIDTH} to {MAX_WIDTH}, or one of small, medium, large, extraLarge"));
+    match v {
+        Value::String(s) => SIZE_PRESETS.iter().find(|(k, _)| k.eq_ignore_ascii_case(s.trim())).map(|(_, w)| *w).ok_or_else(err),
+        Value::Number(n) => n.as_u64().and_then(|w| u32::try_from(w).ok()).filter(|w| (MIN_WIDTH..=MAX_WIDTH).contains(w)).ok_or_else(err),
+        _ => Err(err()),
+    }
+}
+
+/// Check a per-slide duration (NaN, infinities and out-of-range values are errors).
+pub fn check_seconds(s: f64) -> Result<f64> {
+    if (MIN_SECONDS..=MAX_SECONDS).contains(&s) {
+        Ok(s)
+    } else {
+        Err(bad(CMD, format!("`secondsPerSlide` must be from {MIN_SECONDS} to {MAX_SECONDS}")))
+    }
+}
+
+/// Present and not `null`.
+fn given<'a>(p: &'a Value, key: &str) -> Option<&'a Value> {
+    p.get(key).filter(|v| !v.is_null())
+}
+
+impl GifOptions {
+    /// Read `{width?: px | small|medium|large|extraLarge, secondsPerSlide?, loop?: bool |
+    /// forever|once, slides?: [index], includeHidden?}`. Absent or `null` values take their
+    /// defaults; anything else that is out of range or of the wrong type is an error.
+    pub fn from_params(p: &Value) -> Result<Self> {
+        let mut o = GifOptions::default();
+        if let Some(v) = given(p, "width") {
+            o.width = width_value(v)?;
+        }
+        if let Some(v) = given(p, "secondsPerSlide") {
+            let s = v.as_f64().ok_or_else(|| bad(CMD, "`secondsPerSlide` must be a number"))?;
+            o.seconds_per_slide = check_seconds(s)?;
+        }
+        if let Some(v) = given(p, "loop") {
+            o.loop_forever = match v {
+                Value::Bool(b) => *b,
+                Value::String(s) if s.eq_ignore_ascii_case("forever") => true,
+                Value::String(s) if s.eq_ignore_ascii_case("once") => false,
+                _ => return Err(bad(CMD, "`loop` must be true (forever), false (once), \"forever\" or \"once\"")),
+            };
+        }
+        if let Some(v) = given(p, "slides") {
+            let a = v.as_array().ok_or_else(|| bad(CMD, "`slides` must be a list of slide indices"))?;
+            if a.is_empty() {
+                return Err(bad(CMD, "`slides` is empty"));
+            }
+            if a.len() > MAX_FRAMES {
+                return Err(bad(CMD, format!("a GIF can have at most {MAX_FRAMES} slides")));
+            }
+            let list = a
+                .iter()
+                .map(|x| x.as_u64().and_then(|i| usize::try_from(i).ok()))
+                .collect::<Option<Vec<usize>>>()
+                .ok_or_else(|| bad(CMD, "`slides` must be a list of slide indices (0, 1, 2…)"))?;
+            o.slides = Some(list);
+        }
+        if let Some(v) = given(p, "includeHidden") {
+            o.include_hidden = v.as_bool().ok_or_else(|| bad(CMD, "`includeHidden` must be true or false"))?;
+        }
+        Ok(o)
+    }
+
+    /// The slides that become frames, in order: the chosen ones (or all), without hidden slides
+    /// unless `include_hidden`.
+    pub fn frames(&self, doc: &Presentation) -> Result<Vec<usize>> {
+        let n = doc.slides.len();
+        let chosen: Vec<usize> = match &self.slides {
+            Some(list) => {
+                if let Some(i) = list.iter().find(|i| **i >= n) {
+                    return Err(bad(CMD, format!("no slide {i} (the presentation has {n})")));
+                }
+                list.clone()
+            }
+            None => (0..n).collect(),
+        };
+        let frames: Vec<usize> = chosen.into_iter().filter(|i| self.include_hidden || doc.slides.get(*i).is_some_and(|s| !s.hidden)).collect();
+        if frames.is_empty() {
+            return Err(bad(CMD, "no slides to export (they are all hidden, or the presentation is empty)"));
+        }
+        if frames.len() > MAX_FRAMES {
+            return Err(bad(CMD, format!("a GIF can have at most {MAX_FRAMES} slides; choose a range")));
+        }
+        Ok(frames)
+    }
+
+    /// Delay per frame in hundredths of a second.
+    pub fn delay_cs(&self) -> Result<u16> {
+        let s = check_seconds(self.seconds_per_slide)?;
+        // In range by `check_seconds`: 10..=60_000.
+        Ok((s * 100.0).round().clamp(1.0, f64::from(u16::MAX)) as u16)
+    }
+}
+
+/// Frame size for a slide of `doc`'s size at `width` px: the height follows the aspect ratio and
+/// no side exceeds [`MAX_SIDE`].
+pub fn frame_size(doc: &Presentation, width: u32) -> (u32, u32) {
+    let (sw, sh) = (doc.slide_size.width, doc.slide_size.height);
+    let aspect = if sw.is_finite() && sh.is_finite() && sw > 0.0 && sh > 0.0 { sh / sw } else { 9.0 / 16.0 };
+    let w = f64::from(width.clamp(MIN_WIDTH, MAX_WIDTH));
+    let mut h = w * aspect;
+    let mut w2 = w;
+    if h > f64::from(MAX_SIDE) {
+        w2 = w * f64::from(MAX_SIDE) / h;
+        h = f64::from(MAX_SIDE);
+    }
+    let side = |v: f64| if v.is_finite() { v.round().clamp(1.0, f64::from(MAX_SIDE)) as u32 } else { 1 };
+    (side(w2), side(h))
+}
+
+/// Straight RGBA of a premultiplied render composited onto white (GIF has no partial alpha, and
+/// fully transparent pixels would otherwise become see-through).
+fn on_white(img: &deckcraft_render::Image, w: u32, h: u32) -> Vec<u8> {
+    let len = (w as usize).saturating_mul(h as usize).saturating_mul(4);
+    if img.width != w || img.height != h || img.pixels.len() != len {
+        log::error!("GIF export: a slide rendered at {}×{} instead of {w}×{h}; writing a blank frame", img.width, img.height);
+        return vec![255; len];
+    }
+    let mut px = img.pixels.clone();
+    for p in px.as_chunks_mut::<4>().0 {
+        let back = 255 - p[3];
+        p[0] = p[0].saturating_add(back);
+        p[1] = p[1].saturating_add(back);
+        p[2] = p[2].saturating_add(back);
+        p[3] = 255;
+    }
+    px
+}
+
+/// Render and encode the GIF.
+pub fn encode(doc: &Presentation, opts: &GifOptions) -> Result<GifOutput> {
+    use image::codecs::gif::{GifEncoder, Repeat};
+
+    let frames = opts.frames(doc)?;
+    let delay_cs = opts.delay_cs()?;
+    let (w, h) = frame_size(doc, opts.width);
+    let total = (frames.len() as u64).saturating_mul(u64::from(w)).saturating_mul(u64::from(h));
+    if total > MAX_TOTAL_PIXELS {
+        return Err(bad(CMD, format!("{} slides at {w}×{h} is too large for a GIF; choose a smaller size or fewer slides", frames.len())));
+    }
+    let scale = f64::from(w) / doc.slide_size.width;
+    let scale = if scale.is_finite() && scale > 0.0 { scale } else { 1.0 };
+    let enc_err = |e: image::ImageError| EngineError::Other(format!("GIF encoding failed: {e}"));
+    let mut bytes = Vec::new();
+    {
+        let mut enc = GifEncoder::new_with_speed(&mut bytes, QUANTIZER_SPEED);
+        // No repeat block at all means "play once"; a repeat count of 0 means "forever".
+        if opts.loop_forever {
+            enc.set_repeat(Repeat::Infinite).map_err(enc_err)?;
+        }
+        for i in &frames {
+            let img = deckcraft_render::render_slide(doc, *i, &deckcraft_render::RenderOpts { scale, size: Some((w, h)), ..Default::default() });
+            let buffer = image::RgbaImage::from_raw(w, h, on_white(&img, w, h))
+                .ok_or_else(|| EngineError::Other(format!("GIF export: slide {i} has no pixels")))?;
+            let delay = image::Delay::from_numer_denom_ms(u32::from(delay_cs) * 10, 1);
+            enc.encode_frame(image::Frame::from_parts(buffer, 0, 0, delay)).map_err(enc_err)?;
+        }
+    }
+    Ok(GifOutput { bytes, frames: frames.len(), width: w, height: h, delay_cs })
+}
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
+    use image::AnimationDecoder;
+    use serde_json::json;
+
+    use super::*;
+    use crate::Session;
+
+    const COLOURS: [(&str, [u8; 3]); 4] =
+        [("#E02020", [0xE0, 0x20, 0x20]), ("#20A040", [0x20, 0xA0, 0x40]), ("#2040E0", [0x20, 0x40, 0xE0]), ("#F0C000", [0xF0, 0xC0, 0x00])];
+
+    /// Four blank slides with solid backgrounds (red, green, blue, yellow); slide 2 (blue) hidden.
+    fn deck() -> Session {
+        let mut s = Session::new();
+        s.execute("file.new", &json!({"blank": true})).unwrap();
+        while s.doc().unwrap().doc.slides.len() < COLOURS.len() {
+            s.execute("slide.new", &json!({})).unwrap();
+        }
+        for (i, (hex, _)) in COLOURS.iter().enumerate() {
+            s.execute("design.background", &json!({"color": hex, "index": i})).unwrap();
+        }
+        s.execute("slide.hide", &json!({"index": 2, "hidden": true})).unwrap();
+        s
+    }
+
+    fn temp(name: &str) -> std::path::PathBuf {
+        let dir = std::env::temp_dir().join(format!("deckcraft-gif-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        dir.join(name)
+    }
+
+    fn decode(bytes: &[u8]) -> (image::metadata::LoopCount, Vec<image::Frame>) {
+        let dec = image::codecs::gif::GifDecoder::new(std::io::Cursor::new(bytes)).unwrap();
+        let count = dec.loop_count();
+        (count, dec.into_frames().collect_frames().unwrap())
+    }
+
+    /// The NETSCAPE2.0 application block's loop count, if the GIF has one.
+    fn netscape_loops(bytes: &[u8]) -> Option<u16> {
+        let tag = b"NETSCAPE2.0";
+        let at = bytes.windows(tag.len()).position(|w| w == tag)?;
+        // NETSCAPE2.0, sub-block size 3, id 1, loop count (little endian).
+        let b = bytes.get(at + tag.len()..at + tag.len() + 4)?;
+        Some(u16::from_le_bytes([b[2], b[3]]))
+    }
+
+    fn close(a: [u8; 4], b: [u8; 3]) -> bool {
+        (0..3).all(|k| (i32::from(a[k]) - i32::from(b[k])).abs() <= 12) && a[3] == 255
+    }
+
+    #[test]
+    fn exports_one_frame_per_visible_slide() {
+        let mut s = deck();
+        let path = temp("deck.gif");
+        let r = s.execute("file.export", &json!({"path": path.to_string_lossy(), "width": 320, "secondsPerSlide": 1.5})).unwrap();
+        assert_eq!(r["frames"], 3, "{r}");
+        let bytes = std::fs::read(&path).unwrap();
+        assert!(bytes.starts_with(b"GIF89a"));
+        assert_eq!(netscape_loops(&bytes), Some(0), "loops forever by default");
+        let (count, frames) = decode(&bytes);
+        assert!(matches!(count, image::metadata::LoopCount::Infinite));
+        assert_eq!(frames.len(), 3, "the hidden slide is skipped");
+        // Slides are 16:9: 320×180.
+        let expected = [COLOURS[0].1, COLOURS[1].1, COLOURS[3].1];
+        for (f, want) in frames.iter().zip(expected) {
+            assert_eq!((f.buffer().width(), f.buffer().height()), (320, 180));
+            assert_eq!(f.delay().numer_denom_ms(), (1500, 1));
+            let px = f.buffer().get_pixel(160, 90).0;
+            assert!(close(px, want), "frame colour {px:?}, expected {want:?}");
+        }
+        assert_eq!((r["width"].as_u64(), r["height"].as_u64()), (Some(320), Some(180)));
+        let _ = std::fs::remove_file(&path);
+    }
+
+    #[test]
+    fn presets_ranges_hidden_slides_and_play_once() {
+        let s = deck();
+        let doc = &s.doc().unwrap().doc;
+        let o = GifOptions::from_params(&json!({"width": "small", "loop": false, "slides": [3, 2, 1], "includeHidden": true})).unwrap();
+        let out = encode(doc, &o).unwrap();
+        assert_eq!((out.frames, out.width, out.height, out.delay_cs), (3, 640, 360, 500));
+        assert_eq!(netscape_loops(&out.bytes), None, "play once: no repeat block");
+        let (_, frames) = decode(&out.bytes);
+        let want = [COLOURS[3].1, COLOURS[2].1, COLOURS[1].1];
+        for (f, w) in frames.iter().zip(want) {
+            assert!(close(f.buffer().get_pixel(320, 180).0, w));
+            assert_eq!(f.delay().numer_denom_ms(), (5000, 1), "5 seconds by default");
+        }
+        // A range that holds only the hidden slide has nothing to export.
+        let o = GifOptions::from_params(&json!({"slides": [2]})).unwrap();
+        assert!(encode(doc, &o).is_err());
+        for (preset, w) in SIZE_PRESETS {
+            assert_eq!(GifOptions::from_params(&json!({"width": preset})).unwrap().width, w);
+        }
+        assert_eq!(
+            GifOptions::from_params(&json!({"width": "Large", "loop": "once"})).unwrap(),
+            GifOptions { width: 1280, loop_forever: false, ..Default::default() }
+        );
+        assert_eq!(GifOptions::from_params(&json!({"width": null, "secondsPerSlide": null})).unwrap(), GifOptions::default());
+    }
+
+    #[test]
+    fn hostile_params_are_errors_not_panics() {
+        for p in [
+            json!({"width": 0}),
+            json!({"width": 15}),
+            json!({"width": 3841}),
+            json!({"width": -5}),
+            json!({"width": 1e308}),
+            json!({"width": 640.5}),
+            json!({"width": "huge"}),
+            json!({"width": [640]}),
+            json!({"secondsPerSlide": 0}),
+            json!({"secondsPerSlide": 0.05}),
+            json!({"secondsPerSlide": -1}),
+            json!({"secondsPerSlide": 601}),
+            json!({"secondsPerSlide": 1e308}),
+            json!({"secondsPerSlide": "5"}),
+            json!({"loop": 1}),
+            json!({"loop": "twice"}),
+            json!({"slides": []}),
+            json!({"slides": [-1]}),
+            json!({"slides": [0.5]}),
+            json!({"slides": "1-3"}),
+            json!({"slides": vec![0; MAX_FRAMES + 1]}),
+            json!({"includeHidden": "yes"}),
+        ] {
+            assert!(GifOptions::from_params(&p).is_err(), "{p}");
+        }
+        for v in [f64::NAN, f64::INFINITY, f64::NEG_INFINITY, f64::MIN_POSITIVE, 1e-300] {
+            assert!(check_seconds(v).is_err(), "{v}");
+            let o = GifOptions { seconds_per_slide: v, ..Default::default() };
+            assert!(o.delay_cs().is_err(), "{v}");
+        }
+        assert_eq!(GifOptions { seconds_per_slide: 600.0, ..Default::default() }.delay_cs().unwrap(), 60_000);
+        assert_eq!(GifOptions { seconds_per_slide: 0.1, ..Default::default() }.delay_cs().unwrap(), 10);
+
+        // Through the command too: errors, the presentation untouched, no file written.
+        let mut s = deck();
+        let path = temp("hostile.gif");
+        for p in [
+            json!({"width": 99999}),
+            json!({"secondsPerSlide": -3}),
+            json!({"slides": [0, 99]}),
+            json!({"slides": [18446744073709551615u64]}),
+            json!({"slides": [2]}),
+        ] {
+            let mut p = p;
+            p["path"] = json!(path.to_string_lossy());
+            assert!(s.execute("file.export", &p).is_err(), "{p}");
+        }
+        assert!(!path.exists());
+        assert_eq!(s.doc().unwrap().doc.slides.len(), 4);
+    }
+
+    #[test]
+    fn sizes_are_bounded() {
+        let mut s = deck();
+        // A very tall slide is scaled down so no side exceeds MAX_SIDE.
+        s.execute("design.slideSize", &json!({"w": 100.0, "h": 4000.0, "scale": "none"})).unwrap();
+        let doc = &s.doc().unwrap().doc;
+        let (w, h) = frame_size(doc, MAX_WIDTH);
+        assert!(w >= 1 && h <= MAX_SIDE && w <= MAX_WIDTH, "{w}×{h}");
+        // The total pixel budget stops huge requests before anything is rendered.
+        let mut big = Presentation::clone(doc);
+        big.slide_size = deckcraft_geom::Size::new(960.0, 540.0);
+        let slide = big.slides[0].clone();
+        big.slides = vec![slide; 200];
+        let o = GifOptions { width: MAX_WIDTH, ..Default::default() };
+        let e = encode(&big, &o).unwrap_err().to_string();
+        assert!(e.contains("too large"), "{e}");
+        // A degenerate slide size falls back to 16:9 rather than dividing by zero.
+        let mut odd = Presentation::clone(doc);
+        odd.slide_size = deckcraft_geom::Size::new(0.0, f64::NAN);
+        assert_eq!(frame_size(&odd, 640), (640, 360));
+    }
+
+    #[test]
+    fn gif_is_also_a_save_format_and_inferred_from_the_path() {
+        let s = deck();
+        let bytes = crate::cmd::file::save_bytes(&s.doc().unwrap().doc, "gif").unwrap();
+        assert!(bytes.starts_with(b"GIF89a"));
+        assert_eq!(crate::cmd::file::format_for_path("Talk.GIF"), "gif");
+        let bytes = crate::cmd::file::gif_bytes(&s.doc().unwrap().doc, &json!({"width": 64, "slides": [0]})).unwrap();
+        assert_eq!(decode(&bytes).1.len(), 1);
+    }
+}
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index a2d2d2ac..d90942cb 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -9,6 +9,7 @@
 
 pub mod cmd;
 pub mod connect;
+pub mod gif_export;
 pub mod guard;
 pub mod keys;
 pub mod links;
diff --git a/crates/mcp/src/tests.rs b/crates/mcp/src/tests.rs
index b1521521..fd42692b 100644
--- a/crates/mcp/src/tests.rs
+++ b/crates/mcp/src/tests.rs
@@ -117,3 +117,29 @@ fn export_tool_lists_pdf_and_its_options() {
     }
     let _ = std::fs::remove_dir_all(&dir);
 }
+
+#[test]
+fn export_tool_lists_gif_and_its_options() {
+    let mut s = Server::new(Box::new(Headless::new()));
+    let tools = call(&mut s, 1, "tools/list", json!({}));
+    let export = tools["result"]["tools"].as_array().unwrap().iter().find(|t| t["name"] == "export").unwrap().clone();
+    assert!(export["description"].as_str().unwrap().contains("gif"), "{export}");
+    let props = &export["inputSchema"]["properties"];
+    assert!(props["format"]["enum"].as_array().unwrap().iter().any(|x| x == "gif"), "{export}");
+    assert_eq!(props["width"]["oneOf"][1]["enum"], json!(["small", "medium", "large", "extraLarge"]));
+    for p in ["secondsPerSlide", "loop", "slides", "includeHidden"] {
+        assert!(props.get(p).is_some(), "{p}: {export}");
+    }
+    // What the schema describes is accepted, and bad values are tool errors, not crashes.
+    let dir = std::env::temp_dir().join(format!("deckcraft-mcp-gif-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    tool(&mut s, "new_presentation", json!({}));
+    for width in [json!("small"), json!(200)] {
+        let path = dir.join("deck.gif");
+        tool(&mut s, "export", json!({"path": path.to_string_lossy(), "width": width, "secondsPerSlide": 2, "loop": false, "slides": [0]}));
+        assert!(std::fs::read(&path).unwrap().starts_with(b"GIF89a"), "{width}");
+    }
+    let r = call(&mut s, 9, "tools/call", json!({"name": "export", "arguments": {"path": dir.join("bad.gif").to_string_lossy(), "width": 0}}));
+    assert_eq!(r["result"]["isError"], true, "{r}");
+    let _ = std::fs::remove_dir_all(&dir);
+}
diff --git a/crates/mcp/src/tools.rs b/crates/mcp/src/tools.rs
index 1a457dda..44cf8897 100644
--- a/crates/mcp/src/tools.rs
+++ b/crates/mcp/src/tools.rs
@@ -115,21 +115,30 @@ pub fn tool_definitions() -> Vec<Value> {
         tool(
             "export",
             "Export",
-            "Export slides: png/jpeg (one slide, or all with all:true), pptx, deckcraft, outline text, or pdf (slides, notes pages or handouts).",
+            "Export slides: png/jpeg (one slide, or all with all:true), pptx, deckcraft, outline text, pdf (slides, notes pages or handouts), or an animated gif of the deck (one frame per slide).",
             obj(
                 json!({
                     "path": string("Output path"),
-                    "format": {"type": "string", "enum": ["png", "jpeg", "pptx", "deckcraft", "outline", "pdf"], "description": "Output format (default: from the path's extension)"},
+                    "format": {"type": "string", "enum": ["png", "jpeg", "pptx", "deckcraft", "outline", "pdf", "gif"], "description": "Output format (default: from the path's extension)"},
                     "slide": int("Slide index for images"),
                     "all": boolean("All slides (images)"),
                     "scale": num("Pixels per point for images (default 2)"),
                     "layout": {"type": "string", "enum": ["slides", "notes", "handouts"], "description": "PDF page layout (default slides)"},
                     "perPage": {"type": "integer", "enum": [1, 2, 3, 4, 6, 9], "description": "PDF handouts: slides per page (default 6)"},
                     "dpi": num("PDF: raster resolution of slide artwork, 36-600 (default 200)"),
-                    "slides": {"type": "array", "items": {"type": "integer", "minimum": 0}, "description": "PDF: slide indices to export (default all)"},
-                    "includeHidden": boolean("PDF: include hidden slides (default false)"),
+                    "slides": {"type": "array", "items": {"type": "integer", "minimum": 0}, "description": "PDF and GIF: slide indices to export, in order (default all)"},
+                    "includeHidden": boolean("PDF and GIF: include hidden slides (default false)"),
                     "textLayer": boolean("PDF: invisible text layer for search, select and copy (default true)"),
-                    "frame": boolean("PDF notes/handouts: thin frame around each slide (default true)")
+                    "frame": boolean("PDF notes/handouts: thin frame around each slide (default true)"),
+                    "width": {
+                        "oneOf": [
+                            {"type": "integer", "minimum": 16, "maximum": 3840},
+                            {"type": "string", "enum": ["small", "medium", "large", "extraLarge"]}
+                        ],
+                        "description": "GIF: frame width in pixels, or a size: small 640, medium 960 (default), large 1280, extraLarge 1920; the height follows the slide's shape"
+                    },
+                    "secondsPerSlide": {"type": "number", "minimum": 0.1, "maximum": 600, "description": "GIF: seconds each slide shows (default 5)"},
+                    "loop": boolean("GIF: loop forever (true, default) or play once (false)")
                 }),
                 &["path"],
             ),
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 73ce180b..a05c77da 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -377,6 +377,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                 ("JPEG image (current slide)", "jpeg"),
                 ("PowerPoint Presentation (.pptx)", "pptx"),
                 ("Outline (.txt)", "outline"),
+                ("Animated GIF (.gif)", "gif"),
             ] {
                 if ui.radio(fmt == f, l).clicked() {
                     d.fields.insert("fmt".into(), f.into());
@@ -420,6 +421,10 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                     d.fields.insert("pdfHidden".into(), hidden.to_string());
                 }
             }
+            let gif_params = if fmt == "gif" { gif_options(app, ui, d) } else { Ok(Value::Null) };
+            if let Err(e) = &gif_params {
+                ui.label(egui::RichText::new(e).color(Tokens::get(ui.ctx()).text_dim));
+            }
             let pdf_params = {
                 let (layout, per) = match pdf_layout.as_str() {
                     "notes" => ("notes", 0),
@@ -437,15 +442,27 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                     "jpeg" => ("jpg", false),
                     "pptx" => ("pptx", false),
                     "outline" => ("txt", false),
+                    "gif" => ("gif", false),
                     _ => ("png", false),
                 };
                 let suggested = format!("{name}.{ext}");
+                let gif_params = match gif_params {
+                    Ok(v) => v,
+                    // Keep the dialog open so the range or width can be corrected.
+                    Err(e) => {
+                        app.set_status(e);
+                        return false;
+                    }
+                };
+                let extra = match ext {
+                    "pdf" => pdf_params.as_object(),
+                    "gif" => gif_params.as_object(),
+                    _ => None,
+                };
                 if let Some(pick) = app.services.pick_save.as_mut() {
                     if let Some(path) = pick(&suggested) {
                         let mut params = json!({"path": path, "all": all});
-                        if ext == "pdf"
-                            && let (Some(o), Some(extra)) = (params.as_object_mut(), pdf_params.as_object())
-                        {
+                        if let (Some(o), Some(extra)) = (params.as_object_mut(), extra) {
                             o.extend(extra.clone());
                         }
                         let r = app.session.execute("file.export", &params);
@@ -465,6 +482,13 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                             if ext == "png" { img.to_png() } else { img.to_jpeg(92) }
                         }
                         "pdf" => deckcraft_pdf_bytes(&s.doc, &pdf_params),
+                        "gif" => match deckcraft_engine::cmd::file::gif_bytes(&s.doc, &gif_params) {
+                            Ok(b) => b,
+                            Err(e) => {
+                                app.set_status(e.to_string());
+                                return true;
+                            }
+                        },
                         other => deckcraft_engine::cmd::file::save_bytes(&s.doc, other).unwrap_or_default(),
                     };
                     dl(&suggested, &bytes);
@@ -923,6 +947,64 @@ fn inset_wrapped(ui: &mut Ui, add_contents: impl FnOnce(&mut Ui)) {
     });
 }
 
+/// The export dialog's Animated GIF options (size, seconds per slide, loop, slide range, hidden
+/// slides) as `file.export` params; a slide range that doesn't fit the deck is an error message.
+fn gif_options(app: &SlideApp, ui: &mut Ui, d: &mut Dialog) -> Result<Value, String> {
+    use deckcraft_engine::gif_export::{MAX_SECONDS, MAX_WIDTH, MIN_SECONDS, MIN_WIDTH, SIZE_PRESETS};
+    let n = app.session.active().map_or(0, |s| s.doc.slides.len());
+    let size = d.get("gifSize", "medium");
+    let size_label = |k: &str| match k {
+        "small" => "Small (640 px wide)",
+        "large" => "Large (1280 px wide)",
+        "extraLarge" => "Extra Large (1920 px wide)",
+        "custom" => "Custom width",
+        _ => "Medium (960 px wide)",
+    };
+    ui.add_space(4.0);
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(120.0, 20.0), egui::Label::new("Size:"));
+        egui::ComboBox::from_id_salt("gif_size").selected_text(size_label(&size)).show_ui(ui, |ui| {
+            for k in SIZE_PRESETS.iter().map(|(k, _)| *k).chain(["custom"]) {
+                if ui.selectable_label(size == k, size_label(k)).clicked() {
+                    d.fields.insert("gifSize".into(), k.into());
+                }
+            }
+        });
+    });
+    if size == "custom" {
+        field(ui, d, "Width (pixels):", "gifWidth", "960");
+    }
+    field(ui, d, "Seconds per slide:", "gifSeconds", "5");
+    let n_text = n.max(1).to_string();
+    field(ui, d, "From slide:", "gifFrom", "1");
+    field(ui, d, "To slide:", "gifTo", &n_text);
+    let forever = check(ui, d, "Loop forever", "gifLoop", true);
+    let hidden = check(ui, d, "Include hidden slides", "gifHidden", false);
+
+    let width = if size == "custom" {
+        let w = num(d, "gifWidth", 960.0).round();
+        if !(f64::from(MIN_WIDTH)..=f64::from(MAX_WIDTH)).contains(&w) {
+            return Err(format!("Width: enter {MIN_WIDTH} to {MAX_WIDTH} pixels"));
+        }
+        json!(w as u32)
+    } else {
+        json!(size)
+    };
+    let seconds = num(d, "gifSeconds", f64::NAN);
+    if deckcraft_engine::gif_export::check_seconds(seconds).is_err() {
+        return Err(format!("Seconds per slide: enter {MIN_SECONDS} to {MAX_SECONDS}"));
+    }
+    let mut p = json!({"width": width, "secondsPerSlide": seconds, "loop": forever, "includeHidden": hidden});
+    let (from, to) = (num(d, "gifFrom", 1.0).round(), num(d, "gifTo", n as f64).round());
+    if !(from >= 1.0 && from <= to && to <= n as f64) {
+        return Err(format!("Slides: choose a range from 1 to {n}"));
+    }
+    if from > 1.0 || to < n as f64 {
+        p["slides"] = json!(((from as usize - 1)..(to as usize)).collect::<Vec<_>>());
+    }
+    Ok(p)
+}
+
 /// PDF bytes with the export dialog's options (web: downloaded instead of written).
 fn deckcraft_pdf_bytes(doc: &deckcraft_model::Presentation, params: &serde_json::Value) -> Vec<u8> {
     deckcraft_engine::cmd::file::pdf_bytes(doc, params).unwrap_or_default()
@@ -933,6 +1015,62 @@ mod tests {
     use super::*;
     use std::cell::{Cell, RefCell};
 
+    /// The Export… dialog (Animated GIF) shows the GIF options and exports through `file.export` (#171).
+    #[test]
+    fn export_dialog_writes_an_animated_gif() {
+        use egui_kittest::kittest::Queryable as _;
+        let dir = std::env::temp_dir().join(format!("deckcraft-ui-gif-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("deck.gif");
+        let picked = path.to_string_lossy().to_string();
+        let suggested = std::rc::Rc::new(RefCell::new(String::new()));
+        let seen = suggested.clone();
+        let services = crate::Services {
+            pick_save: Some(Box::new(move |s: &str| {
+                *seen.borrow_mut() = s.to_string();
+                Some(picked.clone())
+            })),
+            ..Default::default()
+        };
+        let mut session = deckcraft_engine::Session::with_new();
+        session.execute("slide.new", &json!({})).unwrap();
+        let mut harness = egui_kittest::Harness::builder().with_size(vec2(1200.0, 900.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(session, services),
+        );
+        harness.run_steps(2);
+        harness.state_mut().run("app.exportDialog", json!({})).unwrap();
+        harness.run_steps(2);
+        harness.get_by_label("Animated GIF (.gif)").click_accesskit();
+        harness.run_steps(2);
+        assert_eq!(harness.state().dialog.as_ref().and_then(|d| d.fields.get("fmt")).map(String::as_str), Some("gif"));
+        harness.get_by_label("Seconds per slide:");
+        harness.get_by_label("Loop forever").click_accesskit();
+        harness.run_steps(2);
+        // A range outside the deck keeps the dialog open with a message, and nothing is written.
+        harness.state_mut().dialog.as_mut().unwrap().fields.insert("gifTo".into(), "9".into());
+        harness.run_steps(2);
+        harness.key_press(egui::Key::Enter);
+        harness.run_steps(2);
+        assert!(harness.state().dialog.is_some());
+        assert!(harness.state().status.as_ref().is_some_and(|(m, _)| m.contains("Slides")), "{:?}", harness.state().status);
+        assert!(!path.exists());
+        harness.state_mut().dialog.as_mut().unwrap().fields.insert("gifTo".into(), "2".into());
+        harness.run_steps(2);
+        harness.key_press(egui::Key::Enter);
+        harness.run_steps(2);
+        assert!(harness.state().dialog.is_none(), "the dialog closes after exporting");
+        assert!(suggested.borrow().ends_with(".gif"), "{}", suggested.borrow());
+        let bytes = std::fs::read(&path).unwrap();
+        assert!(bytes.starts_with(b"GIF89a"));
+        assert_eq!(u16::from_le_bytes([bytes[6], bytes[7]]), 960, "medium by default");
+        assert!(!bytes.windows(11).any(|w| w == b"NETSCAPE2.0"), "Loop forever unticked: plays once");
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+
     /// Start screen theme tiles that wrap onto a second row keep the 40-point inset (#17).
     #[test]
     fn inset_wrapped_indents_every_row() {
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 449b7fc6..0995dd5e 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -26,7 +26,7 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `ui.render` | `{path?, slide?, scale?}` | Render a slide headlessly |
 | `ui.resize` / `ui.focus` | | Window control |
 | `show.start` / `show.end` | `{from?: slide index, presenter?, reading?}` | Slide show |
-| `app.open` / `app.save` / `app.export` / `app.quit` | `{path, …}` | Files (export takes the `file.export` params, e.g. `{"path": "deck.pdf", "layout": "handouts", "perPage": 3}`) |
+| `app.open` / `app.save` / `app.export` / `app.quit` | `{path, …}` | Files (export takes the `file.export` params, e.g. `{"path": "deck.pdf", "layout": "handouts", "perPage": 3}` or `{"path": "deck.gif", "width": "large", "secondsPerSlide": 3, "loop": false}`) |
 
 The MCP server (`deckcraft-cli mcp`, see [mcp.md](mcp.md)) wraps the same methods for Claude
 and other agents; `deckcraft-cli app METHOD [JSON]` sends one request from a shell.
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1d87c9ac..0d4a622b 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export, #171; previous: major, created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -28,7 +28,7 @@ PowerPoint opens and saves; Viewer = opens only).
 | Outline `.rtf` / `.txt` | export (RTF), import (outline) | `.txt`/`.md` outline (`slide.fromOutline`) | `.txt` outline | No RTF | engine tests |
 | PNG / JPEG slide images | export | n/a | yes (`file.export`, `deckcraft-cli render`) | Matches the editor's renderer | render tests |
 | TIFF / BMP / GIF slide images | export | n/a | no | Easy (the `image` crate writes them) | none |
-| Animated GIF of the deck | export | n/a | no | | none |
+| Animated GIF of the deck | export | n/a | yes (`file.export` format `gif`, Export…, `deckcraft-cli`, MCP `export`) | One frame per slide from the slide renderer; size small/medium/large/extra large or 16–3840 px wide, 0.1–600 s per slide, loop forever or play once, slide range, hidden slides skipped; a 256-colour palette per frame (exact, or NeuQuant above 256 colours). Transitions and build animations are not animated | `crates/engine/src/gif_export.rs` tests (decoded frames, size, delay, loop, hidden slides, hostile params), MCP, CLI and export dialog tests |
 | MP4 / MOV video of the deck | export | n/a | no | Needs timeline render + H.264 encode | none |
 | Print | yes | n/a | no | PR #66 (browser) open | none |
 
@@ -99,4 +99,5 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Animated GIF of the deck: export yes (#171) |
 | 2026-10-10 | major | Created from PowerPoint 16.113.4's `CFBundleDocumentTypes`, `crates/pptx` reader/writer and tests, and the open round-trip issues |
diff --git a/docs/gaps.md b/docs/gaps.md
index 6ea4130a..a233c430 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export landed, #171; the video gap stays; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -115,11 +115,13 @@ Detail in [file-format-parity.md](file-format-parity.md).
 - **Impact:** handouts and speaker notes are printed in many workplaces.
 - **Estimate:** 5–8 h (print through the PDF path and each OS's print dialog). **Beta blocker.**
 
-### No video or animated GIF export
-- **Evidence:** checklist row missing; PowerPoint exports MP4/MOV and animated GIF.
+### No video export; the animated GIF has no transitions or builds
+- **Evidence:** checklist row "Export video (MP4) / animated GIF" is partial: `file.export` writes
+  an animated GIF with one frame per slide (#171), but there is no MP4/MOV export, and the GIF
+  doesn't animate transitions or build animations.
 - **Impact:** sharing a talk as a video is a common request.
-- **Estimate:** 10–16 h (render the timeline frame by frame; an H.264 encoder is the hard part,
-  FilmCraft has one to copy).
+- **Estimate:** 10–16 h (render the timeline frame by frame, which the GIF can then reuse for
+  transitions and builds; an H.264 encoder is the hard part, FilmCraft has one to copy).
 
 ### Embedded fonts aren't read or written
 - **Evidence:** no `p:embeddedFontLst` handling in `crates/pptx`.
@@ -247,5 +249,6 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Animated GIF export landed (#171); the entry now covers video export and animating transitions in the GIF |
 | 2026-10-10 | minor | Noted that no gap blocks alpha (core-workflow gate passes) |
 | 2026-10-10 | major | Created: every gap from the 2026-10-10 re-measure and the 16 open GitHub issues, ranked, with beta blockers marked |
diff --git a/docs/mcp.md b/docs/mcp.md
index f7e24c7e..5de38172 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -20,7 +20,7 @@ deck.
 | `list_commands` | Every command (id, label, menu, shortcut, params doc), optionally filtered |
 | `run_command` | Run one command: `{command, params}` — every menu item, ribbon button and gesture is a command |
 | `batch` | Run several commands in order and stop at the first error |
-| `new_presentation`, `open_presentation`, `save_presentation`, `export` | Files: native `.deckcraft`, PowerPoint `.pptx`, PDF (slides, notes pages, handouts), PNG/JPEG, outline |
+| `new_presentation`, `open_presentation`, `save_presentation`, `export` | Files: native `.deckcraft`, PowerPoint `.pptx`, PDF (slides, notes pages, handouts), PNG/JPEG, outline, animated GIF (size, seconds per slide, loop, slides) |
 | `inspect_document`, `inspect_slide` | Structure of the deck / one slide (shapes, text, placeholders, animations) |
 | `render_slide` | A slide as an image the model can look at |
 | `add_slide`, `go_to_slide` | Slides by layout |
@@ -33,5 +33,5 @@ deck.
 Useful commands for building decks: `slide.new {layout, title, body}`, `shape.insert {preset,
 rect, text}`, `shape.connect {from, to, preset}`, `shape.freeform {points, closed, smooth}`,
 `shape.merge {op, ids}`, `format.*`, `design.theme`, `transition.set`, `animation.set`,
-`chart.*`, `table.*`, `file.export {path, layout}`. `deckcraft-cli describe ID` prints any
+`chart.*`, `table.*`, `file.export {path, layout}` (PDF) or `{path, width, secondsPerSlide, loop}` (GIF). `deckcraft-cli describe ID` prints any
 command's parameters.
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 8c7337fa..86d17e72 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -1,6 +1,6 @@
 # PowerPoint feature checklist
 
-> **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Generated:** 2026-10-11 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4; video/animated GIF row re-scored 2026-10-11, #171) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
 **Weighted breadth parity: 79%** over 191 features.
@@ -9,12 +9,12 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 60 | 12 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 13 | 28 | 36% |
+| P2 | 54 | 13 | 14 | 27 | 37% |
 
 | Area | Parity |
 |---|---|
 | Application shell | 71% |
-| Files | 71% |
+| Files | 72% |
 | Slides | 90% |
 | Views | 90% |
 | Masters & themes | 85% |
@@ -65,7 +65,7 @@ Open P0 items: Start screen (new, templates/themes, recent), Contextual tabs (Sh
 | Files | Export to PDF (slides, notes pages, handouts; text layer, links, bookmarks; vector artwork pending) | P0 | P |
 | Files | Export slides as PNG/JPEG | P0 | D |
 | Files | Export outline / RTF | P2 | P |
-| Files | Export video (MP4) / animated GIF | P2 | M |
+| Files | Export video (MP4) / animated GIF (GIF: one frame per slide, no transitions; no video) | P2 | P |
 | Files | Print (slides, handouts, notes, outline) | P1 | M |
 | Files | Password protection | P2 | M |
 | Files | Reuse slides from another file | P1 | M |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 0c27d893..82f80ee8 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export, #171: P2 breadth 36% → 37%, overall unchanged; previous: minor, hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -11,7 +11,7 @@ number.
 
 | Number | Value | Kind |
 |---|---|---|
-| **Feature breadth** (weighted checklist) | **79%** over 191 features (P0 92%, P1 75%, P2 36%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md), rows re-scored 2026-10-10 |
+| **Feature breadth** (weighted checklist) | **79%** over 191 features (P0 92%, P1 75%, P2 37%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md), rows re-scored 2026-10-10 |
 | Menu-bar coverage | **59%** (128 of 217 app-specific PowerPoint menu items have a DeckCraft command or UI label of the same name) | **measured** (heuristic lower bound): script matching the 2026-10-07 PowerPoint menu dump against the 226 engine command labels and the UI's strings; excludes the app, Window and Help menus and the subtitle language lists |
 | **Ready for real work** | **~55%** | **estimated**: weighted dimension table below (was ~56% until the features row was recomputed from written area weights) |
 | **Mainstream practitioner** | **~53%** | **estimated**: [method below](#mainstream-practitioner-and-essentials-user) |
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-11 | minor | Animated GIF export (#171) moves the checklist's video/GIF row from missing to partial: P2 breadth 36% → 37%; overall breadth (79%), dimension scores and stage unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |

From c1ab5d3c43a30c1bea35c3e007717e3395f6da98 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sun, 11 Oct 2026 23:36:28 +0200
Subject: [PATCH 026/376] CLI: --help prints usage and unknown render flags are
 rejected (#163)

---
 apps/deckcraft-cli/src/main.rs | 73 ++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index c450393f..78767ae6 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -54,6 +54,14 @@ fn main() -> ExitCode {
         Some("render") => report(render(rest)),
         Some("convert") => report(convert(rest)),
         Some("run") => report(run(rest)),
+        Some("--help" | "-h" | "help") => {
+            outln!("{USAGE}");
+            ExitCode::SUCCESS
+        }
+        Some("commands") if rest.first().is_some_and(|a| is_help(a)) => {
+            outln!("{USAGE}");
+            ExitCode::SUCCESS
+        }
         Some("commands") => {
             let s = Session::new();
             let f = rest.first().map(|x| x.to_lowercase());
@@ -82,6 +90,10 @@ fn main() -> ExitCode {
     }
 }
 
+fn is_help(arg: &str) -> bool {
+    matches!(arg, "--help" | "-h")
+}
+
 fn report(r: Result<(), String>) -> ExitCode {
     match r {
         Ok(()) => ExitCode::SUCCESS,
@@ -103,6 +115,10 @@ fn open(s: &mut Session, input: Option<&str>, sample: bool) -> Result<(), String
 }
 
 fn info(args: &[String]) -> Result<(), String> {
+    if args.first().is_some_and(|a| is_help(a)) {
+        outln!("{USAGE}");
+        return Ok(());
+    }
     let path = args.first().ok_or("info needs a FILE")?;
     let mut s = Session::new();
     open(&mut s, Some(path), false)?;
@@ -127,6 +143,11 @@ fn render(args: &[String]) -> Result<(), String> {
             "--all" => all = true,
             "--edit" => edit = true,
             "--scale" => scale = it.next().and_then(|v| v.parse().ok()).ok_or("--scale needs a number")?,
+            "--help" | "-h" => {
+                outln!("{USAGE}");
+                return Ok(());
+            }
+            other if other.starts_with('-') => return Err(format!("unknown option `{other}`")),
             other
                 if input.is_none()
                     && !sample
@@ -162,6 +183,10 @@ fn render(args: &[String]) -> Result<(), String> {
 }
 
 fn convert(args: &[String]) -> Result<(), String> {
+    if args.first().is_some_and(|a| is_help(a)) {
+        outln!("{USAGE}");
+        return Ok(());
+    }
     let (Some(input), Some(out)) = (args.first(), args.get(1)) else { return Err("convert needs IN and OUT".into()) };
     let mut s = Session::new();
     open(&mut s, Some(input), false)?;
@@ -192,6 +217,10 @@ fn run(args: &[String]) -> Result<(), String> {
             "--save" => save = Some(it.next().cloned().ok_or("--save needs a path")?),
             "--export" => export = Some(it.next().cloned().ok_or("--export needs a path")?),
             "--print" => print = true,
+            "--help" | "-h" => {
+                outln!("{USAGE}");
+                return Ok(());
+            }
             other => return Err(format!("unknown option `{other}`")),
         }
     }
@@ -217,6 +246,10 @@ fn run(args: &[String]) -> Result<(), String> {
 }
 
 fn describe(id: Option<&str>) -> Result<(), String> {
+    if id.is_some_and(is_help) {
+        outln!("{USAGE}");
+        return Ok(());
+    }
     let id = id.ok_or("describe needs a command id")?;
     let c = deckcraft_engine::find_command(id).ok_or_else(|| format!("unknown command `{id}`"))?;
     outln!("{}  —  {}\n  where:    {}\n  shortcut: {}\n  params:   {}", c.id, c.label, c.menu.join(" ▸ "), c.shortcut.unwrap_or("—"), c.params);
@@ -233,6 +266,10 @@ fn app(args: &[String]) -> Result<(), String> {
         match a.as_str() {
             "--port" => port = it.next().cloned().ok_or("--port needs a value")?,
             "--method" => method = Some(it.next().cloned().ok_or("--method needs a name")?),
+            "--help" | "-h" => {
+                outln!("{USAGE}");
+                return Ok(());
+            }
             other => rest.push(other.to_string()),
         }
     }
@@ -261,6 +298,10 @@ fn mcp(args: &[String]) -> Result<(), String> {
         match a.as_str() {
             "--connect" => connect = Some(it.next().cloned().ok_or("--connect needs a port or host:port")?),
             "--sample" => sample = true,
+            "--help" | "-h" => {
+                outln!("{USAGE}");
+                return Ok(());
+            }
             other => return Err(format!("unknown mcp option `{other}`")),
         }
     }
@@ -278,3 +319,35 @@ fn mcp(args: &[String]) -> Result<(), String> {
     let stdin = std::io::stdin();
     server.serve(stdin.lock(), std::io::stdout()).map_err(|e| e.to_string())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn args(a: &[&str]) -> Vec<String> {
+        a.iter().map(|s| s.to_string()).collect()
+    }
+
+    #[test]
+    fn render_help_prints_usage_and_writes_nothing() {
+        assert!(render(&args(&["--help"])).is_ok());
+        assert!(render(&args(&["-h"])).is_ok());
+        assert!(!std::path::Path::new("--help").exists());
+    }
+
+    #[test]
+    fn render_rejects_unknown_flag() {
+        let err = render(&args(&["--sample", "--scael", "2", "out.png"])).unwrap_err();
+        assert_eq!(err, "unknown option `--scael`");
+        assert!(!std::path::Path::new("--scael").exists());
+    }
+
+    #[test]
+    fn other_subcommands_accept_help() {
+        assert!(info(&args(&["--help"])).is_ok());
+        assert!(convert(&args(&["-h"])).is_ok());
+        assert!(run(&args(&["--help"])).is_ok());
+        assert!(describe(Some("--help")).is_ok());
+        assert!(mcp(&args(&["-h"])).is_ok());
+    }
+}

From dd404af8b53029e80d1ff9a7ede02619fdc7ab8a Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Sun, 11 Oct 2026 23:36:37 +0200
Subject: [PATCH 027/376] PDF: map each glyph to its shaping cluster's text in
 ToUnicode (#164)

---
 crates/pdf/src/lib.rs   | 25 ++++++++++++++++---------
 crates/pdf/src/tests.rs | 10 ++++++++++
 2 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index 97eb641b..43da6abb 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -300,8 +300,7 @@ impl Exporter<'_> {
             }
             let Some(font) = self.font(&run.face) else { continue };
             let n = run.glyphs.len();
-            let char_starts: Vec<usize> = text.char_indices().map(|(b, _)| b).chain(std::iter::once(text.len())).collect();
-            let one_to_one = char_starts.len() - 1 == n;
+            let ranges = glyph_text_ranges(&text, run.chars, &run.cells, n);
             let (x0, y0) = (run.glyphs[0].1, run.glyphs[0].2);
             let kg: Vec<KrillaGlyph> = run
                 .glyphs
@@ -309,13 +308,7 @@ impl Exporter<'_> {
                 .enumerate()
                 .map(|(gi, g)| {
                     let next = run.glyphs.get(gi + 1).map_or(g.1 + run.face.advance(g.0) * run.size / run.face.upem.max(1.0), |nx| nx.1);
-                    let range = if one_to_one {
-                        char_starts[gi]..char_starts[gi + 1]
-                    } else if gi == 0 {
-                        0..text.len()
-                    } else {
-                        text.len()..text.len()
-                    };
+                    let range = ranges[gi].clone();
                     KrillaGlyph::new(GlyphId::new(g.0), ((next - g.1) / run.size) as f32, 0.0, ((g.2 - y0) / run.size) as f32, 0.0, range, None)
                 })
                 .collect();
@@ -423,6 +416,20 @@ impl Exporter<'_> {
     }
 }
 
+/// Byte range in `text` (the run's characters `chars`) of each of `n` glyphs, for the ToUnicode map.
+/// `cells` holds each glyph's shaping-cluster head (paragraph character index); a cluster runs to the
+/// next head in the run, so a ligature maps to all its characters and every glyph of a cluster shares
+/// its range (krilla then writes the text once).
+fn glyph_text_ranges(text: &str, chars: (usize, usize), cells: &[(usize, char)], n: usize) -> Vec<std::ops::Range<usize>> {
+    let starts: Vec<usize> = text.char_indices().map(|(b, _)| b).collect();
+    let byte = |ci: usize| ci.checked_sub(chars.0).and_then(|i| starts.get(i).copied()).unwrap_or(text.len());
+    let mut heads: Vec<usize> = cells.iter().map(|c| c.0).collect();
+    heads.sort_unstable();
+    heads.dedup();
+    let end = |ci: usize| heads.get(heads.partition_point(|&h| h <= ci)).copied().unwrap_or(chars.1);
+    (0..n).map(|gi| cells.get(gi).map_or(text.len()..text.len(), |&(ci, _)| byte(ci)..byte(end(ci)))).collect()
+}
+
 fn to_path(bp: &kurbo::BezPath) -> Option<krilla::geom::Path> {
     use kurbo::PathEl;
     let mut pb = krilla::geom::PathBuilder::new();
diff --git a/crates/pdf/src/tests.rs b/crates/pdf/src/tests.rs
index 305f1457..ffc18b40 100644
--- a/crates/pdf/src/tests.rs
+++ b/crates/pdf/src/tests.rs
@@ -66,3 +66,13 @@ fn handout_boxes_fit_the_paper() {
         }
     }
 }
+
+#[test]
+fn glyph_ranges_follow_shaping_clusters() {
+    // "fl" ligature: its glyph maps to both characters, the rest stay one to one (#164).
+    assert_eq!(glyph_text_ranges("flash", (0, 5), &[(0, 'f'), (2, 'a'), (3, 's'), (4, 'h')], 4), vec![0..2, 2..3, 3..4, 4..5]);
+    // Two glyphs in one cluster (base and mark) share its range.
+    assert_eq!(glyph_text_ranges("ab", (0, 2), &[(0, 'a'), (0, 'a'), (1, 'b')], 3), vec![0..1, 0..1, 1..2]);
+    // A run starting mid-paragraph, multi-byte characters in visual (right-to-left) order.
+    assert_eq!(glyph_text_ranges("αβγ", (3, 6), &[(5, 'γ'), (4, 'β'), (3, 'α')], 3), vec![4..6, 2..4, 0..2]);
+}

From d5c62b640acb3a1861b57e79cb6c9dd50a702916 Mon Sep 17 00:00:00 2001
From: Claudio <claudiocp_2@hotmail.com>
Date: Sun, 11 Oct 2026 19:54:21 -0600
Subject: [PATCH 028/376] Ctrl+C then Ctrl+V pastes objects that carry no text
 (Fixes #182)

egui-winit drops Ctrl+V when the system clipboard is empty. Copying a
rectangle or picture puts no text on it, so the shortcut never reached
the session and only the context menu could paste objects. Copy and cut
now leave an invisible word joiner on the system clipboard in that case,
and paste maps it back to the session's own clipboard.
---
 crates/ui-egui/src/lib.rs | 46 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index bef64a4f..edf4ca7c 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -127,6 +127,17 @@ impl Default for UiState {
     }
 }
 
+/// Text put on the system clipboard when the copied objects (a rectangle, a picture, slides…)
+/// carry no text. egui-winit drops Ctrl+V when the system clipboard is empty, so without it the
+/// shortcut never reached the session and only the context menu could paste objects (#182). An
+/// invisible word joiner, so a paste into another app adds nothing visible.
+const OBJECTS_MARKER: &str = "\u{2060}";
+
+/// What a copy/cut leaves on the system clipboard for the session's plain-text rendering `t`.
+fn system_clipboard_text(t: &str) -> String {
+    if t.is_empty() { OBJECTS_MARKER.to_string() } else { t.to_string() }
+}
+
 /// UI-only commands (id, label, shortcut, params).
 pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("view.normal", "Normal", None, "{}"),
@@ -640,17 +651,19 @@ impl SlideApp {
                     if let Ok(v) = self.session.execute("edit.copy", &json!({}))
                         && let Some(t) = v.get("text").and_then(Value::as_str)
                     {
-                        ctx.copy_text(t.to_string());
+                        ctx.copy_text(system_clipboard_text(t));
                     }
                 }
                 egui::Event::Cut => {
                     if let Ok(v) = self.session.execute("edit.cut", &json!({}))
                         && let Some(t) = v.get("text").and_then(Value::as_str)
                     {
-                        ctx.copy_text(t.to_string());
+                        ctx.copy_text(system_clipboard_text(t));
                     }
                 }
                 egui::Event::Paste(text) => {
+                    // Our own marker for objects without text: paste what the session copied.
+                    let text = if text == OBJECTS_MARKER { String::new() } else { text };
                     // An image on the clipboard (screenshots, copied pictures) becomes a picture.
                     let img = if text.is_empty() { self.services.clipboard_image.as_mut().and_then(|f| f()) } else { None };
                     let r = match img {
@@ -938,4 +951,33 @@ mod tests {
         app.run("app.home", json!({})).unwrap();
         assert!(!app.home_open() && app.home.is_none(), "with nothing open the start screen shows anyway");
     }
+
+    /// #182: Ctrl+C then Ctrl+V did nothing for objects without text (a rectangle), because
+    /// egui-winit drops Ctrl+V when the system clipboard is empty; the context menu worked.
+    #[test]
+    fn copy_then_paste_shortcut_duplicates_an_object_without_text() {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        harness.state_mut().session.execute("shape.insert", &json!({"preset": "rect", "rect": [10, 10, 50, 50]})).unwrap();
+        let count = |h: &egui_kittest::Harness<'_, SlideApp>| h.state().session.doc().unwrap().current_slide().unwrap().shapes.len();
+        let before = count(&harness);
+
+        // What the copy leaves on the system clipboard is what egui-winit hands back on Ctrl+V.
+        assert_eq!(system_clipboard_text(""), OBJECTS_MARKER);
+        assert_eq!(system_clipboard_text("hello"), "hello");
+        harness.event(egui::Event::Copy);
+        harness.run_steps(2);
+        harness.event(egui::Event::Paste(OBJECTS_MARKER.to_string()));
+        harness.run_steps(2);
+        assert_eq!(count(&harness), before + 1, "the shortcut pastes a copy of the rectangle");
+        let d = harness.state().session.active().unwrap();
+        let pasted = d.doc.slides[0].shapes.last().unwrap();
+        assert!(pasted.text.as_ref().is_none_or(|t| t.text().is_empty()), "a copy of the rectangle, not a text box holding the marker");
+    }
 }

From 96abeba71baeb021c4686ebc267584855db1dbcf Mon Sep 17 00:00:00 2001
From: Isaac Levine <isaacmlevine4@gmail.com>
Date: Sun, 11 Oct 2026 22:53:29 -0400
Subject: [PATCH 029/376] Slides: edit.selectAll takes scope slides to select
 every slide (#188)

The current slide stays put and any shape or text selection is cleared. A scope other than slides is an error; without a scope the command still selects shapes.
---
 crates/engine/src/cmd/edit.rs | 25 ++++++++++++++++++++--
 crates/engine/src/tests.rs    | 40 +++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 2 deletions(-)

diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 30437b15..19225abb 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -18,7 +18,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("edit.pasteText", "Paste and Match Formatting", ["Edit"], Some("Cmd+Shift+V"), "{text?}", has_doc, paste_text),
         cmd!("edit.duplicate", "Duplicate", ["Edit"], Some("Cmd+D"), "{ids?}", has_selection, duplicate),
         cmd!("edit.delete", "Delete", ["Edit"], Some("Delete"), "{ids?, scope?: slides}", has_doc, delete),
-        cmd!(noundo "edit.selectAll", "Select All", ["Edit"], Some("Cmd+A"), "{}", has_slide, select_all),
+        cmd!(noundo "edit.selectAll", "Select All", ["Edit"], Some("Cmd+A"), "{scope?: slides}", has_slide, select_all),
         cmd!(noundo "edit.deselect", "Deselect", [], Some("Escape"), "{}", has_doc, deselect),
         cmd!(noundo "edit.select", "Select Objects", [], None, "{ids: [id], add?: bool, toggle?: bool}", has_slide, select),
     ]
@@ -323,7 +323,12 @@ fn count(v: &[Shape]) -> usize {
     n
 }
 
-fn select_all(s: &mut Session, _p: &Value) -> Result<Value> {
+fn select_all(s: &mut Session, p: &Value) -> Result<Value> {
+    match p.get("scope") {
+        None | Some(Value::Null) => {}
+        Some(Value::String(v)) if v == "slides" => return select_all_slides(s),
+        Some(_) => return Err(bad("edit.selectAll", "scope must be \"slides\"")),
+    }
     if s.doc()?.selection.text.is_some() {
         return s.execute("text.selectAll", &json!({}));
     }
@@ -335,6 +340,22 @@ fn select_all(s: &mut Session, _p: &Value) -> Result<Value> {
     Ok(json!({"ids": ids}))
 }
 
+/// Thumbnail-pane / sorter select all: every slide, hidden ones included. The current
+/// slide stays where it is (the canvas must not jump), so this is not `slide.selectSlides`.
+fn select_all_slides(s: &mut Session) -> Result<Value> {
+    if s.doc()?.selection.target != crate::Target::Slides {
+        return Err(bad("edit.selectAll", "the slide list is not shown while editing a master"));
+    }
+    let ids: Vec<SlideId> = s.doc()?.doc.slides.iter().map(|x| x.id).collect();
+    s.select(|_, sel| {
+        sel.slides = ids.clone();
+        sel.shapes.clear();
+        sel.text = None;
+        sel.cells = None;
+    })?;
+    Ok(json!({"selected": ids}))
+}
+
 fn deselect(s: &mut Session, _p: &Value) -> Result<Value> {
     s.painter = None;
     s.anim_painter = None;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..0fa8357d 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -543,3 +543,43 @@ fn inserted_hyperlinks_look_like_links() {
     s.execute("format.underline", &json!({})).unwrap();
     assert_eq!(s.execute("format.state", &json!({})).unwrap()["underline"], false);
 }
+
+#[test]
+fn select_all_slides_scope() {
+    let mut s = session();
+    // One slide: selects it, no panic.
+    let r = s.execute("edit.selectAll", &json!({"scope": "slides"})).unwrap();
+    assert_eq!(r["selected"].as_array().map(Vec::len), Some(1));
+    for _ in 0..3 {
+        s.execute("slide.new", &json!({})).unwrap();
+    }
+    s.execute("slide.hide", &json!({"index": 1})).unwrap();
+    s.execute("slide.go", &json!({"index": 1})).unwrap();
+    let before = s.doc().unwrap().selection.slide;
+    s.execute("edit.selectAll", &json!({"scope": "slides"})).unwrap();
+    let st = s.doc().unwrap();
+    let all: Vec<_> = st.doc.slides.iter().map(|x| x.id).collect();
+    assert_eq!(st.selection.slides, all);
+    assert_eq!(st.selection.slide, before, "the current slide must not jump");
+    assert!(st.selection.shapes.is_empty() && st.selection.text.is_none());
+    assert_eq!(st.doc.slides.len(), 4);
+}
+
+#[test]
+fn select_all_slides_leaves_shape_select_all_alone() {
+    let mut s = session();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [10, 10, 50, 50]})).unwrap();
+    s.execute("slide.new", &json!({})).unwrap();
+    s.execute("slide.go", &json!({"index": 0})).unwrap();
+    // No scope: still selects shapes on the current slide.
+    s.execute("edit.selectAll", &json!({})).unwrap();
+    assert!(!s.doc().unwrap().selection.shapes.is_empty());
+    assert!(s.doc().unwrap().selection.slides.len() <= 1);
+}
+
+#[test]
+fn select_all_slides_bad_scope_is_an_error() {
+    let mut s = session();
+    assert!(s.execute("edit.selectAll", &json!({"scope": "everything"})).is_err());
+    assert!(s.execute("edit.selectAll", &json!({"scope": 3})).is_err());
+}

From be019fd615ce58b4bf4a9219d452ad229189dbb3 Mon Sep 17 00:00:00 2001
From: Isaac Levine <isaacmlevine4@gmail.com>
Date: Sun, 11 Oct 2026 22:53:29 -0400
Subject: [PATCH 030/376] Slides: Ctrl+A in the slide pane selects every slide
 (#188)

The UI remembers whether the last press landed in the thumbnail pane (the sorter always counts) and passes scope slides to edit.selectAll in that case.
---
 crates/ui-egui/src/lib.rs    | 51 ++++++++++++++++++++++++++++++++++++
 crates/ui-egui/src/menus.rs  |  5 ++++
 crates/ui-egui/src/thumbs.rs |  6 ++++-
 3 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index bef64a4f..87b4a37d 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -209,6 +209,8 @@ pub struct SlideApp {
     pub(crate) notes_buf: (u64, usize, String),
     /// Thumbnail pane drag (slide index, current drop index).
     pub(crate) thumb_drag: Option<(usize, usize)>,
+    /// The slide thumbnail pane was the last thing clicked, so ⌘A selects slides, not shapes.
+    pub(crate) slides_focused: bool,
 }
 
 impl SlideApp {
@@ -244,6 +246,7 @@ impl SlideApp {
             quit_confirmed: false,
             notes_buf: (0, usize::MAX, String::new()),
             thumb_drag: None,
+            slides_focused: false,
         }
     }
 
@@ -365,6 +368,12 @@ impl SlideApp {
         Ok(Value::Null)
     }
 
+    /// Whether ⌘A should act on the slide list: always in the sorter, in Normal view once the
+    /// thumbnail pane has been clicked.
+    pub(crate) fn slides_list_focused(&self) -> bool {
+        self.ui.view == ViewMode::Sorter || (self.ui.view == ViewMode::Normal && self.slides_focused)
+    }
+
     pub fn start_show(&mut self, from: usize, reading: bool) {
         self.media.stop_owned(media::Owner::Editor);
         if let Some(d) = self.session.active() {
@@ -938,4 +947,46 @@ mod tests {
         app.run("app.home", json!({})).unwrap();
         assert!(!app.home_open() && app.home.is_none(), "with nothing open the start screen shows anyway");
     }
+
+    /// #188: Ctrl/Cmd+A with the slide thumbnail pane focused selects every slide; with the
+    /// canvas focused it still selects shapes.
+    #[test]
+    fn select_all_follows_the_focused_pane() {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        for _ in 0..2 {
+            harness.state_mut().run("slide.new", json!({})).unwrap();
+        }
+        harness.state_mut().run("slide.go", json!({"index": 0})).unwrap();
+        harness.run_steps(3);
+        let click = |h: &mut egui_kittest::Harness<'_, SlideApp>, pos: egui::Pos2| {
+            h.event(egui::Event::PointerMoved(pos));
+            for pressed in [true, false] {
+                h.event(egui::Event::PointerButton { pos, button: egui::PointerButton::Primary, pressed, modifiers: egui::Modifiers::NONE });
+            }
+            h.run_steps(2);
+        };
+        // Press in the thumbnail pane, then Cmd+A.
+        let w = harness.state().ui.thumbs_width;
+        click(&mut harness, egui::pos2(w / 2.0, 300.0));
+        assert!(harness.state().slides_focused);
+        harness.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::A);
+        harness.run_steps(2);
+        let st = harness.state().session.active().unwrap();
+        assert_eq!(st.selection.slides.len(), 3, "every slide is selected");
+
+        // A press on the canvas moves focus away: Cmd+A selects shapes again.
+        click(&mut harness, egui::pos2(700.0, 400.0));
+        assert!(!harness.state().slides_focused);
+        harness.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::A);
+        harness.run_steps(2);
+        let st = harness.state().session.active().unwrap();
+        assert!(!st.selection.shapes.is_empty(), "canvas select all picks the shapes");
+    }
 }
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 9349dc36..2bb080c9 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -10,6 +10,11 @@ use crate::theme::{self, Tokens};
 /// Shortcuts the UI handles itself (views, show, zoom, palette, file dialogs). True when consumed.
 pub fn ui_shortcut(app: &mut SlideApp, key: egui::Key, m: Mods) -> bool {
     use egui::Key::*;
+    if key == A && m.cmd && !m.shift && !m.alt && app.slides_list_focused() {
+        // The engine can't see which pane has focus, so the UI says so through the scope param.
+        let _ = app.run("edit.selectAll", json!({"scope": "slides"}));
+        return true;
+    }
     let id = match (key, m.cmd, m.shift, m.alt) {
         (F5, _, false, _) => {
             app.start_show(0, false);
diff --git a/crates/ui-egui/src/thumbs.rs b/crates/ui-egui/src/thumbs.rs
index ebdc81d0..1dc24d1d 100644
--- a/crates/ui-egui/src/thumbs.rs
+++ b/crates/ui-egui/src/thumbs.rs
@@ -11,7 +11,7 @@ use crate::theme::{self, Tokens};
 pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
     let in_master = app.session.active().is_some_and(|d| d.selection.target != Target::Slides);
-    egui::Panel::left("thumbs")
+    let panel = egui::Panel::left("thumbs")
         .resizable(true)
         .default_size(app.ui.thumbs_width)
         .size_range(150.0..=420.0)
@@ -28,6 +28,10 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                 ui.add_space(20.0);
             });
         });
+    // Focus follows the last press: inside the pane keeps it, anywhere else (canvas, ribbon) drops it.
+    if let Some(pos) = ui.input(|i| if i.pointer.primary_pressed() { i.pointer.interact_pos() } else { None }) {
+        app.slides_focused = panel.response.rect.contains(pos);
+    }
 }
 
 fn list(app: &mut SlideApp, ui: &mut Ui) {

From 1601fd250ac551536ae0143d356ce512695da0ac Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 15:39:40 +0530
Subject: [PATCH 031/376] Slide Size: choose Portrait or Landscape (#198)

The Slide Size dialog gets an Orientation choice that swaps width and
height, and design.slideSize takes orientation: portrait|landscape so a
preset can be made portrait from the CLI and MCP too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/design.rs |  8 +++++++-
 crates/engine/src/tests.rs      |  5 +++++
 crates/ui-egui/src/dialogs.rs   | 11 +++++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 641ddffc..7a4e0ed3 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -33,7 +33,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Slide Size",
             ["Design", "Customize"],
             None,
-            "{preset?: widescreen|standard|… | w, h: pt, scale?: maximize|ensureFit|none}",
+            "{preset?: widescreen|standard|… | w, h: pt, orientation?: portrait|landscape, scale?: maximize|ensureFit|none}",
             has_doc,
             slide_size
         ),
@@ -251,6 +251,12 @@ fn slide_size(s: &mut Session, p: &Value) -> Result<Value> {
             f64_param(p, "h").ok_or_else(|| bad("design.slideSize", "missing `h`"))?.clamp(72.0, 4032.0),
         )
     };
+    let size = match str_param(p, "orientation") {
+        Some("portrait") if size.width > size.height => Size::new(size.height, size.width),
+        Some("landscape") if size.height > size.width => Size::new(size.height, size.width),
+        Some("portrait" | "landscape") | None => size,
+        Some(o) => return Err(bad("design.slideSize", format!("unknown orientation `{o}`"))),
+    };
     let mode = str_param(p, "scale").unwrap_or("ensureFit").to_string();
     s.edit(|doc, _| {
         let old = doc.slide_size;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..7df053c6 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -244,6 +244,11 @@ fn themes_and_slide_size() {
     assert_eq!(s.doc().unwrap().doc.masters[0].theme.name, "Ember");
     s.execute("design.slideSize", &json!({"preset": "standard"})).unwrap();
     assert_eq!(s.doc().unwrap().doc.slide_size.width, 720.0);
+    s.execute("design.slideSize", &json!({"preset": "widescreen", "orientation": "portrait"})).unwrap();
+    assert_eq!((s.doc().unwrap().doc.slide_size.width, s.doc().unwrap().doc.slide_size.height), (540.0, 960.0));
+    s.execute("design.slideSize", &json!({"w": 540.0, "h": 960.0, "orientation": "landscape"})).unwrap();
+    assert_eq!((s.doc().unwrap().doc.slide_size.width, s.doc().unwrap().doc.slide_size.height), (960.0, 540.0));
+    assert!(s.execute("design.slideSize", &json!({"preset": "standard", "orientation": "sideways"})).is_err());
     s.execute("design.headerFooter", &json!({"slideNumber": true, "footer": true, "footerText": "Hello"})).unwrap();
     let v = s.execute("slide.inspect", &json!({})).unwrap();
     assert!(v["shapes"].as_array().unwrap().iter().any(|x| x["placeholder"] == "sldNum"));
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 73ce180b..a8896215 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -148,6 +148,17 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             });
             field(ui, d, "Width (in):", "w", &format!("{:.2}", cur.width / 72.0));
             field(ui, d, "Height (in):", "h", &format!("{:.2}", cur.height / 72.0));
+            let (w, h) = (num(d, "w", cur.width / 72.0), num(d, "h", cur.height / 72.0));
+            ui.horizontal(|ui| {
+                ui.label("Orientation:");
+                let portrait = ui.radio(h > w, "Portrait").clicked();
+                let landscape = ui.radio(w >= h, "Landscape").clicked();
+                // Picking the other orientation swaps the width and height fields.
+                if portrait && w > h || landscape && h > w {
+                    d.fields.insert("w".into(), format!("{h:.2}"));
+                    d.fields.insert("h".into(), format!("{w:.2}"));
+                }
+            });
             let maximize = check(ui, d, "Maximize content (else ensure fit)", "max", false);
             let (ok, cancel) = buttons(ui, "OK");
             if ok {

From 2ff4285be6c2cce69a7ed0fe9d16d83d1a3b1415 Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 16:12:55 +0530
Subject: [PATCH 032/376] Pictures: Change Picture replaces the selected
 picture (#115)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The Picture Format ▸ Change Picture button ran the insert-picture dialog,
so it added a second picture instead of replacing the selected one. A new
app.changePictureDialog picks a file and runs picture.change, which keeps
the picture's position, size and formatting; the canvas right-click menu
offers it on pictures too. On the web, where the file arrives later
through the inbox, the pending change is remembered for that pick.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/canvas.rs |  8 +++++
 crates/ui-egui/src/lib.rs    | 61 ++++++++++++++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs |  2 +-
 3 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index d267f76c..1b0950e5 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -563,6 +563,14 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
                 crate::ribbon::menu_item(app, ui, crate::icons::Icon::Group, "Group", "arrange.group", json!({}));
                 crate::ribbon::menu_item(app, ui, crate::icons::Icon::Ungroup, "Ungroup", "arrange.ungroup", json!({}));
             });
+            let picture = app
+                .session
+                .active()
+                .is_some_and(|d| d.selected_shapes().iter().any(|s| matches!(s.kind, deckcraft_model::ShapeKind::Picture { .. })));
+            if picture && ui.button("Change Picture…").clicked() {
+                let _ = app.run("app.changePictureDialog", json!({}));
+                ui.close();
+            }
             if ui.button("Link…").clicked() {
                 app.dialog = Some(crate::dialogs::Dialog::new("hyperlink"));
                 ui.close();
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index bef64a4f..f402a1a9 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -156,6 +156,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.preferences", "Preferences…", Some("Cmd+,"), "{}"),
     ("app.openDialog", "Open…", None, "{purpose?}"),
     ("app.insertPictureDialog", "Picture from File…", None, "{}"),
+    ("app.changePictureDialog", "Change Picture…", None, "{}"),
     ("app.insertAudioDialog", "Audio from File…", None, "{}"),
     ("app.insertVideoDialog", "Video from File…", None, "{}"),
     ("app.saveAsDialog", "Save As…", None, "{}"),
@@ -209,6 +210,8 @@ pub struct SlideApp {
     pub(crate) notes_buf: (u64, usize, String),
     /// Thumbnail pane drag (slide index, current drop index).
     pub(crate) thumb_drag: Option<(usize, usize)>,
+    /// The web picker's next picture replaces the selected one (`app.changePictureDialog`).
+    change_picture: bool,
 }
 
 impl SlideApp {
@@ -244,6 +247,7 @@ impl SlideApp {
             quit_confirmed: false,
             notes_buf: (0, usize::MAX, String::new()),
             thumb_drag: None,
+            change_picture: false,
         }
     }
 
@@ -348,6 +352,7 @@ impl SlideApp {
             "app.preferences" => self.dialog = Some(dialogs::Dialog::new("preferences")),
             "app.openDialog" => self.pick_and_open(),
             "app.insertPictureDialog" => self.pick_and_insert("picture", "insert.picture"),
+            "app.changePictureDialog" => self.pick_and_insert("picture", "picture.change"),
             "app.insertAudioDialog" => self.pick_and_insert("audio", "insert.audio"),
             "app.insertVideoDialog" => self.pick_and_insert("video", "insert.video"),
             "app.saveAsDialog" => self.save_as_dialog("deckcraft"),
@@ -406,6 +411,7 @@ impl SlideApp {
                 }
             }
         } else if let Some(f) = self.services.open_async.as_mut() {
+            self.change_picture = cmd == "picture.change";
             f(purpose);
         }
     }
@@ -491,6 +497,13 @@ impl SlideApp {
         let Some(inbox) = self.services.inbox.clone() else { return };
         let files: Vec<(String, Vec<u8>)> = inbox.lock().map(|mut v| std::mem::take(&mut *v)).unwrap_or_default();
         for (name, bytes) in files {
+            if std::mem::take(&mut self.change_picture) && deckcraft_engine::cmd::insert::content_type(&name, &bytes).starts_with("image/") {
+                let p = json!({"name": name, "data": deckcraft_engine::cmd::base64_encode(&bytes)});
+                if let Err(e) = self.session.execute("picture.change", &p) {
+                    self.set_status(e.to_string());
+                }
+                continue;
+            }
             self.open_or_insert_bytes(&name, &bytes);
         }
     }
@@ -889,6 +902,54 @@ mod tests {
         sh.text.as_ref().map(|t| t.paragraphs.iter().map(|p| p.text()).collect::<Vec<_>>().join("\n")).unwrap_or_default()
     }
 
+    /// #115: Change Picture replaced nothing — it inserted a second picture.
+    #[test]
+    fn change_picture_replaces_the_selected_picture() {
+        let svg = |c: &str| {
+            format!("<svg xmlns='http://www.w3.org/2000/svg' width='4' height='4'><rect width='4' height='4' fill='{c}'/></svg>").into_bytes()
+        };
+        let media = |app: &SlideApp| {
+            let d = app.session.active().unwrap();
+            let pics: Vec<_> = d.doc.slides[0]
+                .shapes
+                .iter()
+                .filter_map(|s| if let deckcraft_model::ShapeKind::Picture { fill } = &s.kind { Some(fill.media) } else { None })
+                .collect();
+            assert_eq!(pics.len(), 1, "one picture, replaced in place");
+            pics[0]
+        };
+        let insert = |app: &mut SlideApp| {
+            let id =
+                app.session.execute("insert.picture", &json!({"name": "a.svg", "data": deckcraft_engine::cmd::base64_encode(&svg("red"))})).unwrap()
+                    ["id"]
+                    .clone();
+            app.session.execute("edit.select", &json!({"ids": [id]})).unwrap();
+            media(app)
+        };
+
+        // Desktop: the file dialog returns a path.
+        let blue = svg("blue");
+        let services = Services {
+            pick_open: Some(Box::new(|_: &str| Some("b.svg".into()))),
+            read: Some(Box::new(move |_: &str| Ok(blue.clone()))),
+            ..Default::default()
+        };
+        let mut app = SlideApp::new(Session::with_new(), services);
+        let before = insert(&mut app);
+        app.run("app.changePictureDialog", json!({})).unwrap();
+        assert_ne!(media(&app), before);
+
+        // Web: the browser picker delivers the file through the inbox later.
+        let inbox = Inbox::default();
+        let services = Services { open_async: Some(Box::new(|_: &str| {})), inbox: Some(inbox.clone()), ..Default::default() };
+        let mut app = SlideApp::new(Session::with_new(), services);
+        let before = insert(&mut app);
+        app.run("app.changePictureDialog", json!({})).unwrap();
+        inbox.lock().unwrap().push(("b.svg".into(), svg("blue")));
+        app.drain_inbox();
+        assert_ne!(media(&app), before);
+    }
+
     /// #17: Home created a new blank presentation instead of going to the start screen.
     #[test]
     fn home_shows_the_start_screen_over_the_open_presentation() {
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index c7c251ef..d3ef6e9c 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2070,7 +2070,7 @@ fn picture_format(app: &mut SlideApp, ui: &mut Ui) {
             }
         });
         rows(ui, |ui| {
-            small(app, ui, Icon::ChangePicture, "Change Picture", "app.insertPictureDialog", json!({}));
+            small(app, ui, Icon::ChangePicture, "Change Picture", "app.changePictureDialog", json!({}));
             small(app, ui, Icon::ResetPicture, "Reset Picture", "picture.reset", json!({}));
         });
     });

From 99c1e062aa5d12801eb042dc01c3ed3c0787e782 Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 16:20:48 +0530
Subject: [PATCH 033/376] Home: a Selection Pane button that works with nothing
 selected (#132)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The Selection Pane was only under Home ▸ Arrange, which is disabled until
a shape is selected, so it couldn't be opened on an empty selection.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/ribbon.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index c7c251ef..2c57683c 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -984,6 +984,8 @@ fn home(app: &mut SlideApp, ui: &mut Ui) {
     });
     drawing_group(app, ui);
     group(ui, |ui| {
+        // Also under Arrange, but that is disabled until something is selected (#132).
+        big(app, ui, Icon::SelectionPane, "Selection\nPane", "view.pane", json!({"pane": "selection"}));
         big(app, ui, Icon::DesignIdeas, "Design\nIdeas", "view.pane", json!({"pane": "designer"}));
     });
 }

From c462859f6f8de2e68d0fdaba569fe21773e9d2ad Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 17:09:09 +0530
Subject: [PATCH 034/376] PPTX: SmartArt and OLE objects we can't draw keep
 their parts on save (#203)

An object DeckCraft doesn't model kept its XML, but the parts that XML
points to (diagram data, layout, style and colours; an OLE embedding)
were not kept, so a save wrote it as an empty rectangle or its preview.

Opaque now carries those parts (relationship id, full relationship type,
the part as a media item) and the writer re-adds them under the slide's
new relationship ids. A part with relationships of its own, or an
external link, still falls back to the preview with the existing
warning. A diagram's data part loses its link to the cached drawing,
which is a slide relationship id a save renumbers; only diagrams whose
drawing is missing or empty reach this path.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/model/src/lib.rs         |  4 +++
 crates/pptx/src/opc.rs          |  4 ++-
 crates/pptx/src/read/mod.rs     | 34 +++++++++++++++++--------
 crates/pptx/src/read/shapes.rs  | 45 ++++++++++++++++++++++++++++++++-
 crates/pptx/src/write/shapes.rs | 42 +++++++++++++++++++++++++++---
 crates/pptx/tests/malformed.rs  |  2 +-
 crates/pptx/tests/roundtrip.rs  | 32 +++++++++++++++++++++++
 7 files changed, 146 insertions(+), 17 deletions(-)

diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 6940fa4b..4186187b 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -286,6 +286,10 @@ pub enum ShapeKind {
         xml: String,
         preview: Option<MediaId>,
         label: String,
+        /// The parts its XML points to (SmartArt data, an OLE embedding…), so a save writes them
+        /// back: (relationship id used in `xml`, relationship type, the part as a media item).
+        #[serde(default, skip_serializing_if = "Vec::is_empty")]
+        parts: Vec<(String, String, MediaId)>,
     },
 }
 
diff --git a/crates/pptx/src/opc.rs b/crates/pptx/src/opc.rs
index 4ef21c3d..94dd3879 100644
--- a/crates/pptx/src/opc.rs
+++ b/crates/pptx/src/opc.rs
@@ -105,7 +105,7 @@ impl Package {
             let (Some(id), Some(ty), Some(target)) = (r.attr("Id"), r.attr("Type"), r.attr("Target")) else { continue };
             let external = r.attr("TargetMode").is_some_and(|m| m.eq_ignore_ascii_case("external"));
             let target = if external { target.to_string() } else { resolve(&base, target) };
-            out.items.push(Rel { id: id.to_string(), kind: ty.rsplit('/').next().unwrap_or(ty).to_string(), target, external });
+            out.items.push(Rel { id: id.to_string(), kind: ty.rsplit('/').next().unwrap_or(ty).to_string(), ty: ty.to_string(), target, external });
         }
         out
     }
@@ -134,6 +134,8 @@ pub struct Rel {
     pub id: String,
     /// Last segment of the relationship type (`slide`, `image`, `media`…).
     pub kind: String,
+    /// The whole relationship type URI, to write it back as it was.
+    pub ty: String,
     /// Absolute part name for internal targets; the URL for external ones.
     pub target: String,
     pub external: bool,
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index b8c403b5..f004e4c4 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -400,19 +400,33 @@ fn sane_len(v: f64, dflt: f64) -> f64 {
 
 /// Does the element (or a descendant) reference a relationship?
 pub fn has_rel_refs(el: &El) -> bool {
-    fn rec(e: &El, depth: usize) -> bool {
+    !rel_refs(el).is_empty()
+}
+
+/// Is this attribute a relationship id (`r:id`, `r:embed`, `r:dm`…)?
+pub fn is_rel_attr(k: &str, v: &str) -> bool {
+    !k.starts_with("xmlns")
+        && k.contains(':')
+        && matches!(k.rsplit(':').next(), Some("id" | "embed" | "link" | "dm" | "lo" | "qs" | "cs" | "pict" | "href"))
+        && !v.is_empty()
+}
+
+/// Every relationship id `el` and its descendants use, sorted and without repeats.
+pub fn rel_refs(el: &El) -> Vec<String> {
+    fn rec(e: &El, out: &mut Vec<String>, depth: usize) {
         if depth > crate::xml::MAX_DEPTH {
-            return false;
+            return;
+        }
+        out.extend(e.attrs.iter().filter(|(k, v)| is_rel_attr(k, v)).map(|(_, v)| v.clone()));
+        for c in e.elements() {
+            rec(c, out, depth + 1);
         }
-        let own = e.attrs.iter().any(|(k, v)| {
-            !k.starts_with("xmlns")
-                && k.contains(':')
-                && matches!(k.rsplit(':').next(), Some("id" | "embed" | "link" | "dm" | "lo" | "qs" | "cs" | "pict" | "href"))
-                && !v.is_empty()
-        });
-        own || e.elements().any(|c| rec(c, depth + 1))
     }
-    rec(el, 0)
+    let mut out = vec![];
+    rec(el, &mut out, 0);
+    out.sort();
+    out.dedup();
+    out
 }
 
 pub fn color_map(cm: &El) -> Vec<(String, String)> {
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index 2e10e362..3954cee8 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -356,10 +356,53 @@ fn frame(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El, depth: usize) -> S
     } else {
         uri.rsplit('/').next().unwrap_or("Object").to_string()
     };
-    s.kind = ShapeKind::Opaque { xml: part.keep(e), preview, label };
+    // Keep the parts it points to so a save writes it back whole (#203). A part with relationships
+    // of its own, or an external link, can't be carried: the save then falls back to the preview.
+    let parts = super::rel_refs(e)
+        .into_iter()
+        .map(|id| {
+            let rel = part.rels.get(&id).filter(|r| !r.external)?;
+            if !imp.pkg.rels(&rel.target).items.is_empty() {
+                return None;
+            }
+            let (kind, target) = (rel.ty.clone(), rel.target.clone());
+            let media = if rel.kind == "diagramData" { diagram_data(imp, &target) } else { imp.media_for(&target) };
+            Some((id, kind, media?))
+        })
+        .collect::<Option<Vec<_>>>()
+        .unwrap_or_default();
+    s.kind = ShapeKind::Opaque { xml: part.keep(e), preview, label, parts };
     s
 }
 
+/// A diagram's data part, without the link to its cached drawing: that link is a slide
+/// relationship id, which a save renumbers. Only diagrams whose drawing is missing or empty get
+/// here, and those are drawn from their data.
+fn diagram_data(imp: &mut Imp, target: &str) -> Option<deckcraft_model::MediaId> {
+    fn strip(e: &mut El, depth: usize) {
+        if depth > crate::xml::MAX_DEPTH {
+            return;
+        }
+        e.children.retain(|n| !matches!(n, crate::xml::Node::El(c) if c.is("ext") && c.find("dataModelExt").is_some()));
+        for c in e.elements_mut() {
+            strip(c, depth + 1);
+        }
+    }
+    let mut doc = imp.pkg.xml(target)?;
+    strip(&mut doc.root, 0);
+    let xml = format!("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n{}", doc.root.to_xml());
+    let id = deckcraft_model::MediaId(imp.alloc());
+    let content_type = imp.pkg.content_type(target)?;
+    imp.media.push(deckcraft_model::MediaItem {
+        id,
+        name: crate::opc::file_of(target).to_string(),
+        content_type,
+        data: std::sync::Arc::new(xml.into_bytes()),
+        link: None,
+    });
+    Some(id)
+}
+
 /// SmartArt: read the pre-drawn shapes of its drawing part as a group.
 fn smartart(imp: &mut Imp, part: &Part, gd: &El, frame: &Shape, depth: usize) -> Option<Shape> {
     let rel_ids = gd.child("relIds")?;
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 9b7309c0..3df45c6c 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -380,7 +380,7 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
             }
             w.close("p:grpSp");
         }
-        ShapeKind::Opaque { xml, preview, label } => opaque(w, x, o, cx, s, xml, *preview, label),
+        ShapeKind::Opaque { xml, preview, label, parts } => opaque(w, x, o, cx, s, xml, *preview, label, parts),
     }
 }
 
@@ -612,13 +612,31 @@ fn media(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape, m: &deckcraft_
 }
 
 #[allow(clippy::too_many_arguments)]
-fn opaque(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, xml: &str, preview: Option<deckcraft_model::MediaId>, label: &str) {
-    // Kept XML that references no relationships can be written back as it was.
+fn opaque(
+    w: &mut W,
+    x: &mut Exp,
+    o: &mut Out,
+    cx: &mut Ctx,
+    s: &Shape,
+    xml: &str,
+    preview: Option<deckcraft_model::MediaId>,
+    label: &str,
+    parts: &[(String, String, deckcraft_model::MediaId)],
+) {
+    // Kept XML is written back as it was when every part it references was kept too, with those
+    // parts re-added under this slide's relationship ids.
     if let Ok(doc) = crate::xml::parse(xml.as_bytes())
-        && !crate::read::has_rel_refs(&doc.root)
         && matches!(doc.root.local(), "graphicFrame" | "sp" | "grpSp" | "cxnSp")
+        && let Some(ids) = crate::read::rel_refs(&doc.root)
+            .iter()
+            .map(|r| {
+                let (_, kind, m) = parts.iter().find(|(id, ..)| id == r)?;
+                Some((r.clone(), x.media_rel(o, *m, kind)?))
+            })
+            .collect::<Option<std::collections::HashMap<_, _>>>()
     {
         let mut root = doc.root;
+        set_rel_ids(&mut root, &ids, 0);
         let id = cx.id_for(s);
         set_cnvpr_id(&mut root, id);
         w.raw(&root.to_xml());
@@ -668,6 +686,22 @@ fn shape_with_id(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, i
     }
 }
 
+fn set_rel_ids(e: &mut crate::xml::El, ids: &std::collections::HashMap<String, String>, depth: usize) {
+    if depth > crate::xml::MAX_DEPTH {
+        return;
+    }
+    for (k, v) in &mut e.attrs {
+        if crate::read::is_rel_attr(k, v)
+            && let Some(new) = ids.get(v.as_str())
+        {
+            v.clone_from(new);
+        }
+    }
+    for c in e.elements_mut() {
+        set_rel_ids(c, ids, depth + 1);
+    }
+}
+
 fn set_cnvpr_id(el: &mut crate::xml::El, id: u32) {
     fn rec(e: &mut crate::xml::El, id: u32, depth: usize) -> bool {
         if depth > 8 {
diff --git a/crates/pptx/tests/malformed.rs b/crates/pptx/tests/malformed.rs
index e76e3201..633d339e 100644
--- a/crates/pptx/tests/malformed.rs
+++ b/crates/pptx/tests/malformed.rs
@@ -251,7 +251,7 @@ fn export_of_odd_models_is_valid() {
     }
     s.shapes.push(Shape {
         id: ShapeId(7),
-        kind: ShapeKind::Opaque { xml: "<not xml".into(), preview: None, label: "Thing".into() },
+        kind: ShapeKind::Opaque { xml: "<not xml".into(), preview: None, label: "Thing".into(), parts: vec![] },
         ..Default::default()
     });
     p.slides.push(Arc::new(s));
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index 420a3921..ddd62e17 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -730,3 +730,35 @@ fn date_fields_keep_their_type_and_saved_text() {
         assert_eq!(by_name(&q.slides[0], name).text, by_name(&p.slides[0], name).text, "{name}");
     }
 }
+
+/// #203: SmartArt we can't draw kept its XML but lost its diagram parts on save.
+#[test]
+fn smartart_without_a_drawing_keeps_its_parts() {
+    let mut p = defaults::new_presentation(None);
+    let data = p.add_media(
+        "data1.xml",
+        "application/vnd.openxmlformats-officedocument.drawingml.diagramData+xml",
+        br#"<dgm:dataModel xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><dgm:ptLst><dgm:pt modelId="1"><dgm:t><a:p><a:r><a:t>Manager</a:t></a:r></a:p></dgm:t></dgm:pt></dgm:ptLst><dgm:extLst><a:ext uri="http://schemas.microsoft.com/office/drawing/2008/diagram"><dsp:dataModelExt xmlns:dsp="http://schemas.microsoft.com/office/drawing/2008/diagram" relId="rId6"/></a:ext></dgm:extLst></dgm:dataModel>"#.to_vec(),
+    );
+    let mut parts = vec![("rId2".to_string(), "http://schemas.openxmlformats.org/officeDocument/2006/relationships/diagramData".to_string(), data)];
+    for (i, kind) in ["Layout", "QuickStyle", "Colors"].into_iter().enumerate() {
+        let xml = format!(r#"<dgm:{kind} xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram"/>"#).into_bytes();
+        let m = p.add_media(&format!("{kind}1.xml"), &format!("application/vnd.openxmlformats-officedocument.drawingml.diagram{kind}+xml"), xml);
+        parts.push((format!("rId{}", i + 3), format!("http://schemas.openxmlformats.org/officeDocument/2006/relationships/diagram{kind}"), m));
+    }
+    let xml = r#"<p:graphicFrame xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><p:nvGraphicFramePr><p:cNvPr id="4" name="Diagram 3"/><p:cNvGraphicFramePr/><p:nvPr/></p:nvGraphicFramePr><p:xfrm><a:off x="0" y="0"/><a:ext cx="914400" cy="914400"/></p:xfrm><a:graphic><a:graphicData uri="http://schemas.openxmlformats.org/drawingml/2006/diagram"><dgm:relIds xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram" r:dm="rId2" r:lo="rId3" r:qs="rId4" r:cs="rId5"/></a:graphicData></a:graphic></p:graphicFrame>"#;
+    let mut s = new_slide(&mut p, "SmartArt");
+    let mut frame = shape(&mut p, "Diagram 3", 0.0, 0.0, 72.0, 72.0);
+    frame.kind = ShapeKind::Opaque { xml: xml.into(), preview: None, label: "SmartArt".into(), parts };
+    s.shapes.push(frame);
+    p.slides.push(Arc::new(s));
+
+    // Twice: the second save starts from what the first one wrote.
+    let q = round(&round(&p));
+    let ShapeKind::Opaque { parts, .. } = &by_name(&q.slides[1], "Diagram 3").kind else { panic!("not kept as an object") };
+    assert_eq!(parts.len(), 4, "data, layout, style and colours all kept");
+    let data = q.media(parts.iter().find(|(_, k, _)| k.ends_with("/diagramData")).expect("data").2).expect("media");
+    let data = String::from_utf8_lossy(&data.data);
+    assert!(data.contains("Manager"), "{data}");
+    assert!(!data.contains("dataModelExt"), "the link to a drawing that isn't written is dropped: {data}");
+}

From f58f4f425f428eb334382886cdf528be8237a8de Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 17:17:55 +0530
Subject: [PATCH 035/376] PPTX: legacy OLE objects are saved in PowerPoint's
 fallback form (#203)

A legacy OLE object finds its preview in the slide's VML drawing through
spid; DeckCraft doesn't write that drawing, and PowerPoint refused to
open a file whose oleObj has a spid but no VML shape. The reader now
takes the preview picture from the VML drawing (so DeckCraft shows it
too), and the writer drops spid and adds that preview as a p:pic, the
form PowerPoint itself writes as the fallback.

Checked in PowerPoint: the issue's 45545_Comment.pptx saved by DeckCraft
opens with its three embedded objects and draws slide 8's table.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/pptx/src/read/shapes.rs  | 15 ++++++++++++++-
 crates/pptx/src/write/shapes.rs | 31 +++++++++++++++++++++++++++++++
 crates/pptx/tests/roundtrip.rs  | 22 ++++++++++++++++++++++
 3 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index 3954cee8..45f819e3 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -346,7 +346,8 @@ fn frame(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El, depth: usize) -> S
         let mut pics = vec![];
         e.find_all("blip", &mut pics);
         pics.into_iter().find_map(|b| dml::media_ref(imp, part, b))
-    };
+    }
+    .or_else(|| vml_preview(imp, part, gd?.find("oleObj")?.attr("spid")?));
     let label = if let Some(o) = gd.and_then(|g| g.find("oleObj")) {
         o.attr("progId").or(o.attr("name")).unwrap_or("Object").to_string()
     } else if uri.ends_with("/diagram") {
@@ -375,6 +376,18 @@ fn frame(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El, depth: usize) -> S
     s
 }
 
+/// A legacy OLE object's preview: the picture of its shape (`spid`) in the slide's VML drawing.
+fn vml_preview(imp: &mut Imp, part: &Part, spid: &str) -> Option<deckcraft_model::MediaId> {
+    let found = part.rels.all_of("vmlDrawing").find_map(|r| {
+        let doc = imp.pkg.xml(&r.target)?;
+        let mut shapes = vec![];
+        doc.root.find_all("shape", &mut shapes);
+        let relid = shapes.into_iter().find(|s| s.attr("id") == Some(spid))?.find("imagedata")?.attr("o:relid")?.to_string();
+        Some(imp.pkg.rels(&r.target).get(&relid).filter(|i| !i.external)?.target.clone())
+    })?;
+    imp.media_for(&found)
+}
+
 /// A diagram's data part, without the link to its cached drawing: that link is a slide
 /// relationship id, which a save renumbers. Only diagrams whose drawing is missing or empty get
 /// here, and those are drawn from their data.
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 3df45c6c..09c3af2c 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -637,6 +637,7 @@ fn opaque(
     {
         let mut root = doc.root;
         set_rel_ids(&mut root, &ids, 0);
+        ole_fallback(&mut root, x, o, preview);
         let id = cx.id_for(s);
         set_cnvpr_id(&mut root, id);
         w.raw(&root.to_xml());
@@ -686,6 +687,36 @@ fn shape_with_id(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, i
     }
 }
 
+/// A legacy OLE object finds its preview in the slide's VML drawing through `spid`, and PowerPoint
+/// won't open the slide without it. We don't write that drawing, so write PowerPoint's own
+/// fallback form instead: no `spid`, and the preview as a `p:pic`.
+fn ole_fallback(root: &mut crate::xml::El, x: &mut Exp, o: &mut Out, preview: Option<deckcraft_model::MediaId>) {
+    let xfrm = root.child("xfrm").map(|t| {
+        let at = |e: &str, a: &str| t.child(e).and_then(|c| c.attr(a)).unwrap_or("0").to_string();
+        (at("off", "x"), at("off", "y"), at("ext", "cx"), at("ext", "cy"))
+    });
+    let Some(ole) = root
+        .elements_mut()
+        .find(|e| e.is("graphic"))
+        .and_then(|g| g.elements_mut().find(|e| e.is("graphicData")))
+        .and_then(|d| d.elements_mut().find(|e| e.is("oleObj")))
+    else {
+        return;
+    };
+    if ole.child("pic").is_some() || ole.attr("spid").is_none() {
+        return;
+    }
+    ole.attrs.retain(|(k, _)| k != "spid");
+    let rel = preview.and_then(|m| x.media_rel(o, m, "image")).unwrap_or_else(|| x.placeholder_rel(o));
+    let (ox, oy, cx, cy) = xfrm.unwrap_or_default();
+    let pic = format!(
+        r#"<p:pic><p:nvPicPr><p:cNvPr id="0" name=""/><p:cNvPicPr/><p:nvPr/></p:nvPicPr><p:blipFill><a:blip r:embed="{rel}"/><a:stretch><a:fillRect/></a:stretch></p:blipFill><p:spPr><a:xfrm><a:off x="{ox}" y="{oy}"/><a:ext cx="{cx}" cy="{cy}"/></a:xfrm><a:prstGeom prst="rect"><a:avLst/></a:prstGeom></p:spPr></p:pic>"#
+    );
+    if let Ok(d) = crate::xml::parse(pic.as_bytes()) {
+        ole.children.push(crate::xml::Node::El(d.root));
+    }
+}
+
 fn set_rel_ids(e: &mut crate::xml::El, ids: &std::collections::HashMap<String, String>, depth: usize) {
     if depth > crate::xml::MAX_DEPTH {
         return;
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index ddd62e17..7e4745fb 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -762,3 +762,25 @@ fn smartart_without_a_drawing_keeps_its_parts() {
     assert!(data.contains("Manager"), "{data}");
     assert!(!data.contains("dataModelExt"), "the link to a drawing that isn't written is dropped: {data}");
 }
+
+/// #203: a legacy OLE object (preview in the VML drawing we don't write) is saved in PowerPoint's
+/// fallback form, without `spid` and with a `p:pic` preview, or PowerPoint won't open the file.
+#[test]
+fn legacy_ole_object_is_written_in_the_fallback_form() {
+    let mut p = defaults::new_presentation(None);
+    let bin = p.add_media("oleObject1.bin", "application/vnd.openxmlformats-officedocument.oleObject", b"\xD0\xCF\x11\xE0not-a-real-ole".to_vec());
+    let prev = p.add_media("image1.png", "image/png", png(4, 3, [10, 20, 30]));
+    let xml = r#"<p:graphicFrame xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><p:nvGraphicFramePr><p:cNvPr id="4" name="Object 3"/><p:cNvGraphicFramePr/><p:nvPr/></p:nvGraphicFramePr><p:xfrm><a:off x="0" y="0"/><a:ext cx="914400" cy="914400"/></p:xfrm><a:graphic><a:graphicData uri="http://schemas.openxmlformats.org/presentationml/2006/ole"><p:oleObj spid="_x0000_s1026" name="Slide" r:id="rId4" progId="PowerPoint.Slide.8"><p:embed/></p:oleObj></a:graphicData></a:graphic></p:graphicFrame>"#;
+    let parts = vec![("rId4".to_string(), "http://schemas.openxmlformats.org/officeDocument/2006/relationships/oleObject".to_string(), bin)];
+    let mut s = new_slide(&mut p, "OLE");
+    let mut frame = shape(&mut p, "Object 3", 0.0, 0.0, 72.0, 72.0);
+    frame.kind = ShapeKind::Opaque { xml: xml.into(), preview: Some(prev), label: "Slide".into(), parts };
+    s.shapes.push(frame);
+    p.slides.push(Arc::new(s));
+
+    let q = round(&round(&p));
+    let ShapeKind::Opaque { xml, parts, preview, .. } = &by_name(&q.slides[1], "Object 3").kind else { panic!("not kept as an object") };
+    assert!(xml.contains("<p:pic>") && !xml.contains("spid"), "{xml}");
+    assert!(preview.is_some(), "the preview picture is kept");
+    assert!(parts.iter().any(|(_, k, _)| k.ends_with("/oleObject")), "the embedding is kept: {parts:?}");
+}

From 21249df5da70920bd9d55e1ec9e91354d27b5251 Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 17:21:58 +0530
Subject: [PATCH 036/376] PPTX: .potx and .ppsx declare a template and slide
 show main part (#210)

Saving with a .potx or .ppsx name wrote a byte-identical .pptx: the
main part was always presentationml.presentation.main+xml, because
format_for_path folded all three extensions into "pptx". It now keeps
potx/ppsx, and deckcraft_pptx::export_as picks the template or
slideshow content type.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/file.rs  | 10 +++++++---
 crates/pptx/src/lib.rs         | 13 ++++++++++++-
 crates/pptx/src/write/mod.rs   |  8 +++++---
 crates/pptx/tests/roundtrip.rs | 13 +++++++++++++
 4 files changed, 37 insertions(+), 7 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index 55aac8bd..96218056 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -104,10 +104,10 @@ fn open_bytes(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"document": i}))
 }
 
-/// Encode the presentation in `format` (`deckcraft`, `pptx`, `outline`).
+/// Encode the presentation in `format` (`deckcraft`, `pptx`, `potx`, `ppsx`, `outline`, `pdf`).
 pub fn save_bytes(doc: &Presentation, format: &str) -> Result<Vec<u8>> {
     match format {
-        "pptx" | "potx" | "ppsx" => deckcraft_pptx::export(doc).map_err(|e| EngineError::Other(e.to_string())),
+        f @ ("pptx" | "potx" | "ppsx") => deckcraft_pptx::export_as(doc, f).map_err(|e| EngineError::Other(e.to_string())),
         "outline" | "txt" => Ok(deckcraft_format::slides_to_outline(doc).into_bytes()),
         "pdf" => deckcraft_pdf::export(doc, &Default::default()).map_err(|e| EngineError::Other(e.to_string())),
         _ => deckcraft_format::save(doc).map_err(|e| EngineError::Other(e.to_string())),
@@ -138,8 +138,12 @@ pub fn pdf_bytes(doc: &Presentation, p: &Value) -> Result<Vec<u8>> {
 
 pub fn format_for_path(path: &str) -> &'static str {
     let l = path.to_ascii_lowercase();
-    if l.ends_with(".pptx") || l.ends_with(".potx") || l.ends_with(".ppsx") {
+    if l.ends_with(".pptx") {
         "pptx"
+    } else if l.ends_with(".potx") {
+        "potx"
+    } else if l.ends_with(".ppsx") {
+        "ppsx"
     } else if l.ends_with(".png") {
         "png"
     } else if l.ends_with(".jpg") || l.ends_with(".jpeg") {
diff --git a/crates/pptx/src/lib.rs b/crates/pptx/src/lib.rs
index 92274b62..2ef0e33d 100644
--- a/crates/pptx/src/lib.rs
+++ b/crates/pptx/src/lib.rs
@@ -51,7 +51,18 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
 
 /// Write a `.pptx` package.
 pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
-    write::export(p)
+    write::export(p, write::CT_PRES)
+}
+
+/// Write a package for `ext`: `potx` (template) and `ppsx` (slide show) differ from `pptx` only in
+/// the main part's content type.
+pub fn export_as(p: &Presentation, ext: &str) -> Result<Vec<u8>, PptxError> {
+    let ct = match ext {
+        "potx" => write::CT_TEMPLATE,
+        "ppsx" => write::CT_SHOW,
+        _ => write::CT_PRES,
+    };
+    write::export(p, ct)
 }
 
 /// Content type for a file name's extension.
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 5d15246d..6b053d2d 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -19,7 +19,9 @@ use crate::PptxError;
 use crate::opc::{self, NS_A, NS_P, NS_P14, NS_R, PackageOut, RelsOut};
 use crate::xml::{A, W};
 
-const CT_PRES: &str = "application/vnd.openxmlformats-officedocument.presentationml.presentation.main+xml";
+pub(crate) const CT_PRES: &str = "application/vnd.openxmlformats-officedocument.presentationml.presentation.main+xml";
+pub(crate) const CT_TEMPLATE: &str = "application/vnd.openxmlformats-officedocument.presentationml.template.main+xml";
+pub(crate) const CT_SHOW: &str = "application/vnd.openxmlformats-officedocument.presentationml.slideshow.main+xml";
 const CT_SLIDE: &str = "application/vnd.openxmlformats-officedocument.presentationml.slide+xml";
 const CT_LAYOUT: &str = "application/vnd.openxmlformats-officedocument.presentationml.slideLayout+xml";
 const CT_MASTER: &str = "application/vnd.openxmlformats-officedocument.presentationml.slideMaster+xml";
@@ -360,7 +362,7 @@ fn sanitized(p: &Presentation) -> std::borrow::Cow<'_, Presentation> {
     std::borrow::Cow::Owned(q)
 }
 
-pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
+pub fn export(p: &Presentation, main_ct: &str) -> Result<Vec<u8>, PptxError> {
     let p = sanitized(p);
     let p: &Presentation = &p;
     let mut x = Exp {
@@ -500,7 +502,7 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
     let ts = crate::tables::table_styles_xml(&x.table_styles);
     x.pkg.xml_part("ppt/tableStyles.xml", CT_TABLE_STYLES, ts);
     let pxml = presentation_xml(&mut x, &mut pres, &master_rids, notes_master_rid.as_deref(), &slide_rids);
-    x.pkg.xml_part("ppt/presentation.xml", CT_PRES, pxml);
+    x.pkg.xml_part("ppt/presentation.xml", main_ct, pxml);
     x.pkg.rels("ppt/presentation.xml", &pres.rels);
 
     // Document properties and package relationships.
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index 420a3921..58e3f52c 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -730,3 +730,16 @@ fn date_fields_keep_their_type_and_saved_text() {
         assert_eq!(by_name(&q.slides[0], name).text, by_name(&p.slides[0], name).text, "{name}");
     }
 }
+
+/// #210: `.potx` and `.ppsx` were written with the `.pptx` main content type.
+#[test]
+fn templates_and_slide_shows_declare_their_own_main_content_type() {
+    let p = rich_deck();
+    for (ext, kind) in [("pptx", "presentation"), ("potx", "template"), ("ppsx", "slideshow")] {
+        let bytes = deckcraft_pptx::export_as(&p, ext).expect("export");
+        let mut z = zip::ZipArchive::new(std::io::Cursor::new(&bytes)).expect("zip");
+        let ct = std::io::read_to_string(z.by_name("[Content_Types].xml").expect("content types")).expect("read");
+        assert!(ct.contains(&format!("presentationml.{kind}.main+xml")), "{ext}: {ct}");
+        assert_eq!(deckcraft_pptx::import(&bytes).expect("import").slides.len(), p.slides.len(), "{ext} reads back");
+    }
+}

From aaec22c681824d0635e8a3024ee34c0fdd3770e5 Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 17:30:03 +0530
Subject: [PATCH 037/376] PPTX: a lone guide keeps the name its preset uses,
 adj1 or adj (#214)

The writer named a preset's only guide `adj` whenever the preset has one
adjust value, but bentConnector3, curvedConnector3, frame, mathPlus,
mathMinus and mathMultiply call it `adj1`, and PowerPoint refuses to open
a file that renames it. The names come from PowerPoint itself: every
autoshape and connector created with an adjusted first value and saved;
these six are the only single-guide presets named `adj1`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/pptx/src/write/shapes.rs |  5 ++++-
 crates/pptx/tests/roundtrip.rs  | 30 ++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 9b7309c0..55ac30ae 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -100,7 +100,10 @@ pub fn geometry(w: &mut W, g: &Geom) {
                     vals.push(defaults.get(vals.len()).copied().unwrap_or(0.0));
                 }
                 w.open0("a:avLst");
-                let single = if defaults.is_empty() { vals.len() == 1 } else { defaults.len() == 1 };
+                // A lone guide is `adj`, except in these presets, which name it `adj1` (as PowerPoint
+                // writes them); PowerPoint won't open a file that renames it (#214).
+                let adj1 = matches!(name, "bentConnector3" | "curvedConnector3" | "frame" | "mathPlus" | "mathMinus" | "mathMultiply");
+                let single = !adj1 && if defaults.is_empty() { vals.len() == 1 } else { defaults.len() == 1 };
                 for (i, v) in vals.iter().enumerate() {
                     let n = if single && i == 0 { "adj".to_string() } else { format!("adj{}", i + 1) };
                     let v = if v.is_finite() { v.round().clamp(-2.0e9, 2.0e9) as i64 } else { 0 };
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index 420a3921..8e259ed9 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -730,3 +730,33 @@ fn date_fields_keep_their_type_and_saved_text() {
         assert_eq!(by_name(&q.slides[0], name).text, by_name(&p.slides[0], name).text, "{name}");
     }
 }
+
+/// #214: a lone guide was always written `adj`, but these presets name it `adj1`, and PowerPoint
+/// won't open the file otherwise. (Names as PowerPoint writes them.)
+#[test]
+fn single_guide_names_follow_the_preset() {
+    let mut p = defaults::new_presentation(None);
+    let mut s = new_slide(&mut p, "Guides");
+    let cases = [
+        ("bentConnector3", "adj1"),
+        ("curvedConnector3", "adj1"),
+        ("frame", "adj1"),
+        ("mathPlus", "adj1"),
+        ("mathMinus", "adj1"),
+        ("mathMultiply", "adj1"),
+        ("roundRect", "adj"),
+        ("chevron", "adj"),
+    ];
+    for (prst, _) in cases {
+        let mut sh = shape(&mut p, prst, 0.0, 0.0, 100.0, 50.0);
+        sh.geom = Geom::Preset { name: prst.into(), adj: vec![20000.0] };
+        s.shapes.push(sh);
+    }
+    p.slides.push(Arc::new(s));
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut z = zip::ZipArchive::new(std::io::Cursor::new(&bytes)).expect("zip");
+    let xml = std::io::read_to_string(z.by_name("ppt/slides/slide2.xml").expect("slide")).expect("read");
+    for (prst, gd) in cases {
+        assert!(xml.contains(&format!(r#"<a:prstGeom prst="{prst}"><a:avLst><a:gd name="{gd}" fmla="val 20000"/>"#)), "{prst} → {gd}: {xml}");
+    }
+}

From 9c64754f207db91dde2eb838121b51951c7c525b Mon Sep 17 00:00:00 2001
From: lloyd <34131158+LloydNicholson@users.noreply.github.com>
Date: Mon, 12 Oct 2026 14:22:47 +0200
Subject: [PATCH 038/376] Read Markdown outlines as Markdown (#211)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

File ▸ Open's Outline filter accepts `.md`, but a `.md` was read with the
plain outline format (unindented line = slide, indent = bullet), so a
Markdown outline written the usual way kept `#` in its titles and made
every top-level list item a slide of its own.

`deckcraft_format::markdown_to_slides` reads ATX headings (`#`–`######`,
closing `#`s dropped) as slide titles, list items (`-`, `*`, `+`, `1.`,
`1)`) as bullets nested by their indentation, and other lines under a
heading as body paragraphs. A `.md` without headings is still read as a
plain outline, so existing indented `.md` outlines open as before; `.txt`
is unchanged. Opening a `.md` and dropping one on the window
(`slide.fromOutline {markdown: true}`) use it. Both readers now share the
slide builder.

Tests: the outline from the issue (2 slides, nested bullets), numbered and
`*`/`+` lists with text under a heading, `slide.fromOutline` with
`markdown`, plain `.txt`/`.md` outlines unchanged, and heading / list-item
edge cases (not-a-heading forms, closing hashes, Unicode, long digit runs).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/file.rs  |   6 +-
 crates/engine/src/cmd/slide.rs |  15 +++-
 crates/engine/src/tests.rs     |  55 ++++++++++++++
 crates/format/src/lib.rs       | 130 ++++++++++++++++++++++++++-------
 crates/ui-egui/src/lib.rs      |   6 +-
 docs/file-format-parity.md     |   2 +-
 6 files changed, 183 insertions(+), 31 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index 55aac8bd..2a2fed78 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -68,7 +68,11 @@ pub fn open_presentation(name: &str, bytes: &[u8]) -> Result<Presentation> {
     if lower.ends_with(".txt") || lower.ends_with(".md") {
         let text = String::from_utf8_lossy(bytes);
         let mut p = defaults::blank_presentation(defaults::WIDE, Default::default(), false);
-        deckcraft_format::outline_to_slides(&mut p, &text);
+        if lower.ends_with(".md") {
+            deckcraft_format::markdown_to_slides(&mut p, &text);
+        } else {
+            deckcraft_format::outline_to_slides(&mut p, &text);
+        }
         if p.slides.is_empty() {
             p = defaults::new_presentation(None);
         }
diff --git a/crates/engine/src/cmd/slide.rs b/crates/engine/src/cmd/slide.rs
index 3d8ad344..df9accd8 100644
--- a/crates/engine/src/cmd/slide.rs
+++ b/crates/engine/src/cmd/slide.rs
@@ -47,7 +47,15 @@ pub fn specs() -> Vec<CommandSpec> {
         ),
         cmd!("section.removeAll", "Remove All Sections", ["Home", "Slides", "Section"], None, "{}", has_slide, section_remove_all),
         cmd!("section.move", "Move Section", [], None, "{index, to}", has_slide, section_move),
-        cmd!("slide.fromOutline", "Slides from Outline…", ["Insert", "Slides From"], None, "{text}", has_doc, from_outline),
+        cmd!(
+            "slide.fromOutline",
+            "Slides from Outline…",
+            ["Insert", "Slides From"],
+            None,
+            "{text, markdown?: bool (headings are slides, list items bullets)}",
+            has_doc,
+            from_outline
+        ),
     ]
 }
 
@@ -572,10 +580,11 @@ fn section_move(s: &mut Session, p: &Value) -> Result<Value> {
 
 fn from_outline(s: &mut Session, p: &Value) -> Result<Value> {
     let text = str_param(p, "text").unwrap_or("").to_string();
+    let markdown = bool_param(p, "markdown").unwrap_or(false);
     s.edit(|doc, sel| {
         let before = doc.slides.len();
-        let n = deckcraft_format::outline_to_slides(doc, &text);
-        // outline_to_slides appends; move them after the current slide.
+        let n = if markdown { deckcraft_format::markdown_to_slides(doc, &text) } else { deckcraft_format::outline_to_slides(doc, &text) };
+        // both append; move them after the current slide.
         let at = (sel.slide + 1).min(before);
         let new: Vec<_> = doc.slides.drain(before..).collect();
         for (k, sl) in new.into_iter().enumerate() {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..3864a34e 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -543,3 +543,58 @@ fn inserted_hyperlinks_look_like_links() {
     s.execute("format.underline", &json!({})).unwrap();
     assert_eq!(s.execute("format.state", &json!({})).unwrap()["underline"], false);
 }
+
+/// Each slide as (title, [(level, bullet text)]).
+fn outline_of(p: &deckcraft_model::Presentation) -> Vec<(String, Vec<(u8, String)>)> {
+    p.slides
+        .iter()
+        .map(|s| {
+            let body =
+                s.shapes.get(1).and_then(|b| b.text.as_ref()).map(|t| t.paragraphs.iter().map(|p| (p.level, p.text())).collect()).unwrap_or_default();
+            (s.title(), body)
+        })
+        .collect()
+}
+
+const MD_OUTLINE: &str = "# Intro\n- Point one\n- Point two\n  - Sub point\n\n# Second\n- More\n";
+
+fn md_expected() -> Vec<(String, Vec<(u8, String)>)> {
+    vec![
+        ("Intro".into(), vec![(0, "Point one".into()), (0, "Point two".into()), (1, "Sub point".into())]),
+        ("Second".into(), vec![(0, "More".into())]),
+    ]
+}
+
+#[test]
+fn markdown_outlines_take_headings_as_slides_and_lists_as_bullets() {
+    let p = crate::cmd::file::open_presentation("outline.md", MD_OUTLINE.as_bytes()).unwrap();
+    assert_eq!(outline_of(&p), md_expected());
+    // numbered lists, `*` / `+` bullets, text under a heading, and closing #s
+    let p = crate::cmd::file::open_presentation("o.md", b"## Plan ##\n1. First\n2) Second\n* star\n+ plus\nA plain line\n").unwrap();
+    assert_eq!(
+        outline_of(&p),
+        vec![("Plan".into(), vec![(0, "First".into()), (0, "Second".into()), (0, "star".into()), (0, "plus".into()), (0, "A plain line".into())])]
+    );
+}
+
+#[test]
+fn slides_from_a_markdown_outline_file() {
+    let mut s = session();
+    s.execute("slide.fromOutline", &json!({"text": MD_OUTLINE, "markdown": true})).unwrap();
+    let doc = &s.doc().unwrap().doc;
+    assert_eq!(outline_of(doc)[1..], md_expected()[..]);
+}
+
+#[test]
+fn plain_outlines_are_unchanged() {
+    // .txt keeps the indentation format, and so does a .md without headings
+    let indented = "Intro\n\tPoint one\n\t\tSub point\nSecond\n\tMore\n";
+    let want =
+        vec![("Intro".to_string(), vec![(0, "Point one".to_string()), (1, "Sub point".to_string())]), ("Second".into(), vec![(0, "More".into())])];
+    for name in ["outline.txt", "outline.md"] {
+        let p = crate::cmd::file::open_presentation(name, indented.as_bytes()).unwrap();
+        assert_eq!(outline_of(&p), want, "{name}");
+    }
+    let p = crate::cmd::file::open_presentation("outline.txt", MD_OUTLINE.as_bytes()).unwrap();
+    assert_eq!(p.slides.first().map(|s| s.title()).as_deref(), Some("# Intro"));
+}
diff --git a/crates/format/src/lib.rs b/crates/format/src/lib.rs
index 1b37a232..47357399 100644
--- a/crates/format/src/lib.rs
+++ b/crates/format/src/lib.rs
@@ -147,18 +147,35 @@ pub fn repair(p: &mut Presentation) {
     p.slide_size.height = p.slide_size.height.min(4000.0);
 }
 
+/// Slides read from an outline: each title with its body paragraphs (level 0–8, text).
+type OutlineSlides = Vec<(String, Vec<(u8, String)>)>;
+
+/// Append a Title and Content slide per outline entry; the number made.
+fn add_outline_slides(p: &mut Presentation, slides: OutlineSlides) -> usize {
+    let Some(lay) = defaults::layout_of_kind(p, LayoutType::TitleAndContent) else { return 0 };
+    let made = slides.len();
+    for (title, body) in slides {
+        let mut s = defaults::new_slide(p, lay);
+        if let Some(t) = s.shapes.first_mut() {
+            t.text = Some(TextBody::from_text(&title));
+        }
+        if let Some(b) = s.shapes.get_mut(1) {
+            for (level, line) in body {
+                let tb = b.text.get_or_insert_with(TextBody::default);
+                let mut para = Paragraph::new(&line);
+                para.level = level.min(8);
+                tb.paragraphs.push(para);
+            }
+        }
+        p.slides.push(Arc::new(s));
+    }
+    made
+}
+
 /// Outline text: one slide per unindented line; tab-indented lines become body bullets at their
 /// level (Insert ▸ Slides from Outline, View ▸ Outline copy).
 pub fn outline_to_slides(p: &mut Presentation, text: &str) -> usize {
-    let Some(lay) = defaults::layout_of_kind(p, LayoutType::TitleAndContent) else { return 0 };
-    let mut made = 0;
-    let mut cur: Option<deckcraft_model::Slide> = None;
-    let flush = |p: &mut Presentation, s: Option<deckcraft_model::Slide>, made: &mut usize| {
-        if let Some(s) = s {
-            p.slides.push(Arc::new(s));
-            *made += 1;
-        }
-    };
+    let mut slides: OutlineSlides = Vec::new();
     for raw in text.lines() {
         if raw.trim().is_empty() {
             continue;
@@ -166,25 +183,69 @@ pub fn outline_to_slides(p: &mut Presentation, text: &str) -> usize {
         let tabs = raw.chars().take_while(|c| *c == '\t').count();
         let spaces = raw.chars().take_while(|c| *c == ' ').count() / 2;
         let level = tabs.max(spaces);
-        let line = raw.trim().trim_start_matches(['-', '*', '•']).trim();
+        let line = raw.trim().trim_start_matches(['-', '*', '•']).trim().to_string();
         if level == 0 {
-            flush(p, cur.take(), &mut made);
-            let mut s = defaults::new_slide(p, lay);
-            if let Some(t) = s.shapes.first_mut() {
-                t.text = Some(TextBody::from_text(line));
-            }
-            cur = Some(s);
-        } else if let Some(s) = cur.as_mut()
-            && let Some(body) = s.shapes.get_mut(1)
-        {
-            let tb = body.text.get_or_insert_with(TextBody::default);
-            let mut para = Paragraph::new(line);
-            para.level = (level - 1).min(8) as u8;
-            tb.paragraphs.push(para);
+            slides.push((line, Vec::new()));
+        } else if let Some((_, body)) = slides.last_mut() {
+            body.push(((level - 1).min(8) as u8, line));
         }
     }
-    flush(p, cur, &mut made);
-    made
+    add_outline_slides(p, slides)
+}
+
+/// An ATX heading's text (CommonMark: up to three spaces, one to six `#`, then a space or the end;
+/// a closing run of `#` is dropped).
+fn md_heading(line: &str) -> Option<&str> {
+    let t = line.strip_prefix("   ").or_else(|| line.strip_prefix("  ")).or_else(|| line.strip_prefix(' ')).unwrap_or(line);
+    let hashes = t.chars().take_while(|c| *c == '#').count();
+    let rest = t.get(hashes..)?;
+    if !(1..=6).contains(&hashes) || !(rest.is_empty() || rest.starts_with([' ', '\t'])) {
+        return None;
+    }
+    let rest = rest.trim();
+    let closed = rest.trim_end_matches('#');
+    Some(if closed.is_empty() || closed.ends_with([' ', '\t']) { closed.trim_end() } else { rest })
+}
+
+/// A list item's nesting level (two spaces or a tab each) and text: `-`, `*` or `+`, or digits
+/// then `.` or `)`, followed by a space.
+fn md_list_item(line: &str) -> Option<(u8, &str)> {
+    let indent: usize = line.chars().take_while(|c| matches!(c, ' ' | '\t')).map(|c| if c == '\t' { 2 } else { 1 }).sum();
+    let t = line.trim_start();
+    let rest = match t.strip_prefix(['-', '*', '+']) {
+        Some(r) => r,
+        None => {
+            let digits = t.chars().take_while(char::is_ascii_digit).count();
+            if digits == 0 || digits > 9 {
+                return None;
+            }
+            t.get(digits..)?.strip_prefix(['.', ')'])?
+        }
+    };
+    rest.starts_with([' ', '\t']).then(|| ((indent / 2).min(8) as u8, rest.trim()))
+}
+
+/// Markdown outline text (`.md`): each heading starts a slide with its text as the title; list
+/// items under it become bullets nested by their indentation, other lines body paragraphs. Text
+/// before the first heading is skipped, as indented lines before the first title are in the
+/// plain format. A file without headings is read as a plain outline ([`outline_to_slides`]).
+pub fn markdown_to_slides(p: &mut Presentation, text: &str) -> usize {
+    if !text.lines().any(|l| md_heading(l).is_some()) {
+        return outline_to_slides(p, text);
+    }
+    let mut slides: OutlineSlides = Vec::new();
+    for line in text.lines() {
+        if line.trim().is_empty() {
+            continue;
+        }
+        if let Some(title) = md_heading(line) {
+            slides.push((title.to_string(), Vec::new()));
+        } else if let Some((_, body)) = slides.last_mut() {
+            let (level, text) = md_list_item(line).unwrap_or((0, line.trim()));
+            body.push((level, text.to_string()));
+        }
+    }
+    add_outline_slides(p, slides)
 }
 
 /// The deck as outline text (titles unindented, body paragraphs tab-indented by level).
@@ -259,4 +320,23 @@ mod tests {
         let o = slides_to_outline(&p);
         assert!(o.contains("Intro\n\tPoint one\n\t\tSub point\nSecond"), "{o}");
     }
+
+    #[test]
+    fn markdown_headings_and_list_items() {
+        assert_eq!(md_heading("# Intro"), Some("Intro"));
+        assert_eq!(md_heading("   ### Deep ###  "), Some("Deep"));
+        assert_eq!(md_heading("## C# and F#"), Some("C# and F#"));
+        assert_eq!(md_heading("#"), Some(""));
+        assert_eq!(md_heading("## Ünïcödé"), Some("Ünïcödé"));
+        for not in ["#5 priority", "####### seven", "    # code", "text", "", "é#"] {
+            assert_eq!(md_heading(not), None, "{not:?}");
+        }
+        assert_eq!(md_list_item("- a"), Some((0, "a")));
+        assert_eq!(md_list_item("    * b"), Some((2, "b")));
+        assert_eq!(md_list_item("\t+ c"), Some((1, "c")));
+        assert_eq!(md_list_item("12) d"), Some((0, "d")));
+        for not in ["-x", "1.x", "1", "1234567890. long", "• bullet", "é. x", ""] {
+            assert_eq!(md_list_item(not), None, "{not:?}");
+        }
+    }
 }
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index bef64a4f..24e2006f 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -519,7 +519,11 @@ impl SlideApp {
             self.set_status(format!("{name}: DeckCraft can't open this kind of file"));
             return;
         };
-        let p = if cmd == "slide.fromOutline" { json!({"text": String::from_utf8_lossy(bytes)}) } else { json!({"name": name, "data": data}) };
+        let p = if cmd == "slide.fromOutline" {
+            json!({"text": String::from_utf8_lossy(bytes), "markdown": lower.ends_with(".md")})
+        } else {
+            json!({"name": name, "data": data})
+        };
         if self.session.active().is_none() && cmd != "file.openBytes" {
             let _ = self.session.execute("file.new", &json!({}));
         }
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1d87c9ac..8cca7d6a 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -25,7 +25,7 @@ PowerPoint opens and saves; Viewer = opens only).
 | `.thmx` Office theme | Viewer | no | no | Browse for themes is a P2 row | none |
 | `.deckcraft` native (zip + JSON) | n/a | yes (also `.slidecraft`) | yes | Lossless for the DeckCraft model, forward compatible | `crates/format` tests |
 | PDF | export | no | yes | Slides, notes pages, handouts (1–9); real-text layer with embedded subsets, links, bookmarks. Slide artwork is a raster image at print resolution, not vector | `crates/pdf` tests |
-| Outline `.rtf` / `.txt` | export (RTF), import (outline) | `.txt`/`.md` outline (`slide.fromOutline`) | `.txt` outline | No RTF | engine tests |
+| Outline `.rtf` / `.txt` | export (RTF), import (outline) | `.txt` outline; `.md` as Markdown (headings are slides, list items bullets) (`slide.fromOutline`) | `.txt` outline | No RTF | engine tests |
 | PNG / JPEG slide images | export | n/a | yes (`file.export`, `deckcraft-cli render`) | Matches the editor's renderer | render tests |
 | TIFF / BMP / GIF slide images | export | n/a | no | Easy (the `image` crate writes them) | none |
 | Animated GIF of the deck | export | n/a | no | | none |

From bd61308cf91bcbeaa989fe28e6b24fc769172c78 Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 17:59:59 +0530
Subject: [PATCH 039/376] Animations: nine PowerPoint exit effects import as
 themselves (#147)

Exit effects DeckCraft had no entry for (Peek Out, Strips, Blinds, Box,
Checkerboard, Diamond, Sink Down, Spinner, Contract) imported as a plain
Fade and lost their direction, so a Peek Out or Sink Down didn't move.
Each mirrors an entrance DeckCraft already plays, so it is played as that
entrance in reverse (Sink Down as Rise Up, leaving downward); the import
keeps PowerPoint's direction and saving writes a matching filter or
motion. Float Out now also writes its motion.

The preset ids and directions come from PowerPoint: every effect, as
entrance and exit, in every direction it accepts, saved and read back.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/anim/src/effects.rs      |  9 +++++++++
 crates/anim/src/tests.rs        | 12 ++++++++++++
 crates/anim/src/timeline.rs     |  3 ++-
 crates/model/src/anim.rs        |  9 +++++++++
 crates/pptx/src/maps.rs         | 25 +++++++++++++++++++++++++
 crates/pptx/src/write/timing.rs | 19 ++++++++++++-------
 6 files changed, 69 insertions(+), 8 deletions(-)

diff --git a/crates/anim/src/effects.rs b/crates/anim/src/effects.rs
index 37776f83..51a82a71 100644
--- a/crates/anim/src/effects.rs
+++ b/crates/anim/src/effects.rs
@@ -44,6 +44,15 @@ pub(crate) fn exit_base(effect: &str) -> &str {
         "swivelOut" => "swivel",
         "bounceOut" => "bounce",
         "dissolveOut" => "dissolve",
+        "blindsOut" => "blinds",
+        "boxOut" => "box",
+        "checkerboardOut" => "checkerboard",
+        "diamondOut" => "diamond",
+        "peekOut" => "peek",
+        "stripsOut" => "strips",
+        "sinkDown" => "rise",
+        "spinnerOut" => "spinner",
+        "contract" => "expand",
         other => other,
     }
 }
diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..d3f07204 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -789,3 +789,15 @@ fn show_follows_links() {
     assert_eq!(s.follow(&p, &Action::LastViewed, None), LinkJump::None);
     assert_eq!(s.slide, 3);
 }
+
+/// #147: exits PowerPoint plays downward leave downward here too.
+#[test]
+fn sink_down_and_peek_out_to_bottom_move_down() {
+    for (effect, option) in [("sinkDown", ""), ("peekOut", "b"), ("floatOut", "d")] {
+        let mut a = anim(1, AnimClass::Exit, effect, AnimStart::OnClick);
+        a.option = option.into();
+        let tl = Timeline::new(&slide_with(vec![a]), W, H);
+        let s = tl.state(ShapeId(1), None, 0, 0.5);
+        assert!(s.offset_y > 0.0, "{effect} {option}: {s:?}");
+    }
+}
diff --git a/crates/anim/src/timeline.rs b/crates/anim/src/timeline.rs
index e73acfd9..2932b173 100644
--- a/crates/anim/src/timeline.rs
+++ b/crates/anim/src/timeline.rs
@@ -471,7 +471,8 @@ fn build_spec(a: &Animation, xf: Xfrm, sw: f64, sh: f64, resolve: &dyn Fn(&deckc
     EffectSpec {
         class: a.class,
         effect,
-        option: a.option.clone(),
+        // Sink Down is Rise Up played backwards, leaving downward.
+        option: if a.effect == "sinkDown" { "d".into() } else { a.option.clone() },
         accel: a.smooth_start,
         decel: a.smooth_end,
         bounce: a.bounce_end,
diff --git a/crates/model/src/anim.rs b/crates/model/src/anim.rs
index 3495d21e..667b3952 100644
--- a/crates/model/src/anim.rs
+++ b/crates/model/src/anim.rs
@@ -270,6 +270,15 @@ pub static ANIMATIONS: &[(&str, &str, AnimClass, u32, u32, &[&str])] = &[
     ("swivelOut", "Swivel", AnimClass::Exit, 45, 2000, &["horz", "vert"]),
     ("bounceOut", "Bounce", AnimClass::Exit, 26, 2000, &[]),
     ("dissolveOut", "Dissolve Out", AnimClass::Exit, 9, 500, &[]),
+    ("blindsOut", "Blinds", AnimClass::Exit, 3, 500, &["horz", "vert"]),
+    ("boxOut", "Box", AnimClass::Exit, 4, 500, &["in", "out"]),
+    ("checkerboardOut", "Checkerboard", AnimClass::Exit, 5, 500, &["across", "down"]),
+    ("diamondOut", "Diamond", AnimClass::Exit, 8, 500, &["in", "out"]),
+    ("peekOut", "Peek Out", AnimClass::Exit, 12, 500, &["b", "l", "t", "r"]),
+    ("stripsOut", "Strips", AnimClass::Exit, 18, 500, &["lu", "ru", "ld", "rd"]),
+    ("sinkDown", "Sink Down", AnimClass::Exit, 37, 1000, &[]),
+    ("spinnerOut", "Spinner", AnimClass::Exit, 49, 1000, &[]),
+    ("contract", "Contract", AnimClass::Exit, 55, 500, &[]),
     ("lines", "Lines", AnimClass::Path, 64, 2000, &["down", "up", "right", "left"]),
     ("arcs", "Arcs", AnimClass::Path, 37, 2000, &["down", "up", "right", "left"]),
     ("turns", "Turns", AnimClass::Path, 43, 2000, &["down", "up", "right", "left"]),
diff --git a/crates/pptx/src/maps.rs b/crates/pptx/src/maps.rs
index c700d8eb..70b9f5cf 100644
--- a/crates/pptx/src/maps.rs
+++ b/crates/pptx/src/maps.rs
@@ -256,6 +256,12 @@ const SUBTYPES: &[(&str, &[(&str, u32)])] = &[
     ("blinds", HV),
     ("swivel", HV),
     ("swivelOut", HV),
+    ("blindsOut", HV),
+    ("boxOut", INOUT),
+    ("checkerboardOut", &[("across", 10), ("down", 5)]),
+    ("diamondOut", INOUT),
+    ("peekOut", DIR4),
+    ("stripsOut", &[("lu", 9), ("ru", 3), ("ld", 12), ("rd", 6)]),
     ("checkerboard", &[("across", 10), ("down", 5)]),
     ("wheel", WHEEL),
     ("wheelOut", WHEEL),
@@ -329,6 +335,25 @@ mod tests {
     use super::*;
     use crate::xml::parse;
 
+    /// #147: these exits, with their directions, fell back to a plain fade (PowerPoint's ids).
+    #[test]
+    fn exit_presets_import_as_their_own_effects() {
+        for (preset, sub, effect, option) in [
+            (3, 10, "blindsOut", "horz"),
+            (4, 32, "boxOut", "out"),
+            (5, 5, "checkerboardOut", "down"),
+            (8, 16, "diamondOut", "in"),
+            (12, 4, "peekOut", "b"),
+            (18, 6, "stripsOut", "rd"),
+            (37, 0, "sinkDown", ""),
+            (49, 0, "spinnerOut", ""),
+            (55, 0, "contract", ""),
+        ] {
+            let e = effect_for_preset(AnimClass::Exit, preset).expect("known exit");
+            assert_eq!((e, option_from_subtype(e, sub).as_str()), (effect, option), "preset {preset}");
+        }
+    }
+
     #[test]
     fn every_transition_kind_round_trips() {
         for (kind, _, _, _, opts) in deckcraft_model::anim::TRANSITIONS {
diff --git a/crates/pptx/src/write/timing.rs b/crates/pptx/src/write/timing.rs
index aa577ca7..56ba5a9d 100644
--- a/crates/pptx/src/write/timing.rs
+++ b/crates/pptx/src/write/timing.rs
@@ -208,14 +208,14 @@ fn filter_for(effect: &str, option: &str) -> &'static str {
                 "randombar(horizontal)"
             }
         }
-        "blinds" => {
+        "blinds" | "blindsOut" => {
             if option == "vert" {
                 "blinds(vertical)"
             } else {
                 "blinds(horizontal)"
             }
         }
-        "box" => {
+        "box" | "boxOut" => {
             if option == "out" {
                 "box(out)"
             } else {
@@ -229,7 +229,7 @@ fn filter_for(effect: &str, option: &str) -> &'static str {
                 "circle(in)"
             }
         }
-        "diamond" => {
+        "diamond" | "diamondOut" => {
             if option == "out" {
                 "diamond(out)"
             } else {
@@ -246,7 +246,7 @@ fn filter_for(effect: &str, option: &str) -> &'static str {
             "plusOut" => "plus(out)",
             _ => "circle(in)",
         },
-        "checkerboard" => {
+        "checkerboard" | "checkerboardOut" => {
             if option == "down" {
                 "checkerboard(down)"
             } else {
@@ -261,13 +261,13 @@ fn filter_for(effect: &str, option: &str) -> &'static str {
             "8" => "wheel(8)",
             _ => "wheel(1)",
         },
-        "strips" => match option {
+        "strips" | "stripsOut" => match option {
             "ru" => "strips(upRight)",
             "ld" => "strips(downLeft)",
             "rd" => "strips(downRight)",
             _ => "strips(upLeft)",
         },
-        "peek" => match option {
+        "peek" | "peekOut" => match option {
             "t" => "slide(fromTop)",
             "l" => "slide(fromLeft)",
             "r" => "slide(fromRight)",
@@ -328,7 +328,12 @@ fn behaviors(w: &mut W, x: &mut Exp, ids: &mut Ids, e: &Eff) {
                     anim_prop(w, ids, e, dur, "ppt_x", "#ppt_x", fx);
                     anim_prop(w, ids, e, dur, "ppt_y", "#ppt_y", fy);
                 }
-                "zoomOut" | "shrinkTurn" => {
+                "floatOut" | "sinkDown" => {
+                    let to = if a.effect == "sinkDown" || a.option == "d" { "#ppt_y+.1" } else { "#ppt_y-.1" };
+                    anim_prop(w, ids, e, dur, "ppt_y", "#ppt_y", to);
+                    anim_effect(w, ids, e, dur, "fade", true);
+                }
+                "zoomOut" | "shrinkTurn" | "spinnerOut" | "contract" => {
                     anim_prop(w, ids, e, dur, "ppt_w", "#ppt_w", "0");
                     anim_prop(w, ids, e, dur, "ppt_h", "#ppt_h", "0");
                     anim_effect(w, ids, e, dur, "fade", true);

From 0167c0c31fda642a9e61fca86ff95224285406d4 Mon Sep 17 00:00:00 2001
From: Marco Arnulfo <marcoarnulfo1@gmail.com>
Date: Mon, 12 Oct 2026 13:40:46 +0200
Subject: [PATCH 040/376] Title bar: on macOS the window buttons sit centred in
 it (#71)

AppKit draws the traffic lights 16 pt from the top of the window on macOS 27,
but the title bar was 38 pt, so they sat above its centre line. On macOS the
bar is now 32 pt, centred on them: content starts after the lights with the gap
they keep from the top, and the Present button shrinks to 22 pt to keep a
margin. Same approach as wordcraft #255 and gridcraft #323, with the light
metrics measured on macOS 27. Linux, Windows and web are unchanged.
---
 crates/ui-egui/src/ribbon.rs | 49 +++++++++++++++++++++++++++++++++---
 1 file changed, 45 insertions(+), 4 deletions(-)

diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index c7c251ef..987fa21f 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -12,6 +12,28 @@ use crate::widgets::{self, RIBBON_H, big_button, big_button_ex, color_split, dro
 
 pub const TITLE_H: f32 = 38.0;
 
+/// macOS draws the window into the title bar (`with_fullsize_content_view`) and AppKit paints the
+/// traffic lights itself, 16 pt from the top of the window on macOS 27. Moving them would take
+/// AppKit calls (`unsafe`, forbidden here), so on macOS the title bar is the band they are centred
+/// in, with the controls beside them (#71). Up to macOS 15 the lights are smaller and centred 14 pt
+/// from the top, about 2 pt above this bar's centre.
+pub const MAC_TITLE_BAR: f32 = 32.0;
+/// The traffic lights as AppKit lays them out, measured on macOS 27: button diameter,
+/// centre-to-centre pitch and the first button's left edge.
+const MAC_LIGHT: f32 = 14.0;
+const MAC_LIGHT_PITCH: f32 = 23.0;
+const MAC_LIGHTS_LEFT: f32 = 9.0;
+/// Where title-bar content starts on macOS: the end of the three lights plus the gap the lights
+/// keep from the top of the window.
+pub const MAC_CONTENT_LEFT: f32 = MAC_LIGHTS_LEFT + 2.0 * MAC_LIGHT_PITCH + MAC_LIGHT + (MAC_TITLE_BAR - MAC_LIGHT) / 2.0;
+
+/// The title bar's height, the left edge of its content and the height of its tallest control.
+/// With the integrated title bar (macOS) the bar is shorter, so the controls shrink to keep a
+/// margin above and below them.
+fn title_geometry(integrated: bool) -> (f32, f32, f32) {
+    if integrated { (MAC_TITLE_BAR, MAC_CONTENT_LEFT, 22.0) } else { (TITLE_H, 10.0, 26.0) }
+}
+
 /// Is engine command `id` enabled right now?
 pub fn enabled(app: &SlideApp, id: &str) -> bool {
     match deckcraft_engine::find_command(id) {
@@ -27,7 +49,8 @@ fn run(app: &mut SlideApp, id: &str, p: Value) {
 /// The window's title row: traffic-light space, quick access, centred title, actions.
 pub fn title_bar(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
-    egui::Panel::top("title_bar").exact_size(TITLE_H).frame(egui::Frame::NONE.fill(t.chrome)).show(ui, |ui| {
+    let (height, left, control_h) = title_geometry(app.integrated_titlebar);
+    egui::Panel::top("title_bar").exact_size(height).frame(egui::Frame::NONE.fill(t.chrome)).show(ui, |ui| {
         let rect = ui.max_rect();
         // Dragging the empty title bar moves the window.
         let drag = ui.interact(rect, ui.id().with("titledrag"), Sense::click_and_drag());
@@ -38,7 +61,6 @@ pub fn title_bar(app: &mut SlideApp, ui: &mut Ui) {
             let max = ui.input(|i| i.viewport().maximized.unwrap_or(false));
             ui.ctx().send_viewport_cmd(egui::ViewportCommand::Maximized(!max));
         }
-        let left = if app.integrated_titlebar { 84.0 } else { 10.0 };
         let mut child = ui.new_child(
             egui::UiBuilder::new()
                 .max_rect(Rect::from_min_max(pos2(rect.min.x + left, rect.min.y), pos2(rect.min.x + 420.0, rect.max.y)))
@@ -78,8 +100,8 @@ pub fn title_bar(app: &mut SlideApp, ui: &mut Ui) {
         let share = right.add(
             egui::Button::new(egui::RichText::new("  Present  ").color(t.accent_text).font(theme::bold(13.0)))
                 .fill(t.accent)
-                .corner_radius(CornerRadius::same(13))
-                .min_size(vec2(84.0, 26.0)),
+                .corner_radius(control_h / 2.0)
+                .min_size(vec2(84.0, control_h)),
         );
         if share.clicked() && has_doc {
             let from = app.session.active().map(|d| d.selection.slide).unwrap_or(0);
@@ -2405,3 +2427,22 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+#[cfg(test)]
+mod title_bar_tests {
+    use super::*;
+
+    #[test]
+    fn mac_title_bar_centres_and_clears_the_traffic_lights() {
+        let (h, left, control) = title_geometry(true);
+        // AppKit centres the lights in its own band, so the bar is that band.
+        assert_eq!(h, MAC_TITLE_BAR);
+        // Content keeps the same gap after the lights as the lights keep from the top.
+        let lights_end = MAC_LIGHTS_LEFT + 2.0 * MAC_LIGHT_PITCH + MAC_LIGHT;
+        assert_eq!(left - lights_end, (h - MAC_LIGHT) / 2.0);
+        // The tallest controls keep at least 4 pt above and below.
+        assert!(control <= h - 8.0);
+        // Other platforms keep their system frame and the original bar.
+        assert_eq!(title_geometry(false), (TITLE_H, 10.0, 26.0));
+    }
+}

From b22d88c8454d5a739a8831cf9ba59fc3430d4e62 Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 18:18:51 +0530
Subject: [PATCH 041/376] Notes and Presenter View: long notes scroll,
 presenter controls show (#221)

Long speaker notes grew out of the notes pane and over the slide: the
editor now scrolls inside the pane. In Presenter View the Previous, Next
and End Show buttons drew dark text on the dark window, so they looked
missing; they are now light on a visible fill, and the timer gets Pause /
Resume and Reset.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/show.rs   | 56 +++++++++++++++++++++++++++++++++---
 crates/ui-egui/src/status.rs | 25 ++++++++++------
 2 files changed, 68 insertions(+), 13 deletions(-)

diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 1c8e6e1e..56f82b79 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -33,6 +33,8 @@ pub struct Show {
     goto: String,
     started: bool,
     show_start: f64,
+    /// When the presenter paused the timer.
+    timer_paused: Option<f64>,
     timings: Vec<(usize, f64)>,
     last_move: f64,
     pub ended: bool,
@@ -89,6 +91,7 @@ impl Show {
             goto: String::new(),
             started: false,
             show_start: 0.0,
+            timer_paused: None,
             timings: vec![],
             last_move: 0.0,
             ended: false,
@@ -717,6 +720,23 @@ fn gif_hit(ctx: &egui::Context, ui: &Ui, show: &Show, doc: &Presentation, app: &
 }
 
 impl Show {
+    /// The presenter timer: time since the show started, frozen while paused.
+    fn elapsed(&self, now: f64) -> f64 {
+        self.timer_paused.unwrap_or(now) - self.show_start
+    }
+
+    fn toggle_timer(&mut self, now: f64) {
+        match self.timer_paused.take() {
+            Some(at) => self.show_start += now - at,
+            None => self.timer_paused = Some(now),
+        }
+    }
+
+    fn reset_timer(&mut self, now: f64) {
+        self.show_start = now;
+        self.timer_paused = self.timer_paused.map(|_| now);
+    }
+
     fn reading_bar_hit(&self, ctx: &egui::Context) -> bool {
         // Clicks on the on-screen controls must not also advance.
         ctx.input(|i| i.pointer.interact_pos()).is_some_and(|p| {
@@ -746,8 +766,12 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
     }
     let next_tex = show.next_tex.as_ref().filter(|(k, _)| Some(*k) == next).map(|(_, t)| t.clone());
     let notes = doc.slides.get(cur).map(|s| s.notes_text()).unwrap_or_default();
-    let elapsed = now - show.show_start;
+    let elapsed = show.elapsed(now);
     let mut actions = vec![];
+    // The presenter window is dark; default buttons draw dark text on it (#221).
+    let button = |ui: &mut Ui, s: &str| {
+        ui.add(egui::Button::new(egui::RichText::new(s).size(15.0).color(Color32::WHITE)).fill(Color32::from_gray(60)).min_size(vec2(0.0, 30.0)))
+    };
     ctx.show_viewport_immediate(
         egui::ViewportId::from_hash_of("deckcraft_presenter"),
         egui::ViewportBuilder::default().with_title("Presenter View — DeckCraft").with_inner_size([1100.0, 700.0]),
@@ -764,16 +788,22 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
                         .size(22.0)
                         .color(Color32::WHITE),
                     );
+                    if button(ui, if show.timer_paused.is_some() { "Resume" } else { "Pause" }).clicked() {
+                        show.toggle_timer(now);
+                    }
+                    if button(ui, "Reset").clicked() {
+                        show.reset_timer(now);
+                    }
                     ui.add_space(20.0);
                     ui.label(egui::RichText::new(format!("Slide {} of {}", cur + 1, doc.slides.len())).size(16.0).color(Color32::from_gray(200)));
                     ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
-                        if ui.button("End Show").clicked() {
+                        if button(ui, "End Show").clicked() {
                             *keep = false;
                         }
-                        if ui.button("Next ▶").clicked() {
+                        if button(ui, "Next ▶").clicked() {
                             actions.push(show.state.next(doc));
                         }
-                        if ui.button("◀ Previous").clicked() {
+                        if button(ui, "◀ Previous").clicked() {
                             actions.push(show.state.prev(doc));
                         }
                     });
@@ -825,6 +855,24 @@ mod tests {
 
     use super::*;
 
+    /// #221: the presenter could not pause or restart the timer.
+    #[test]
+    fn presenter_timer_pauses_resumes_and_resets() {
+        let doc = deckcraft_engine::Session::with_new().active().unwrap().doc.clone();
+        let mut show = Show::new(&doc, 0, false, false);
+        show.show_start = 10.0;
+        assert_eq!(show.elapsed(15.0), 5.0);
+        show.toggle_timer(15.0);
+        assert_eq!(show.elapsed(40.0), 5.0, "paused");
+        show.toggle_timer(40.0);
+        assert_eq!(show.elapsed(42.0), 7.0, "resumed where it stopped");
+        show.reset_timer(50.0);
+        assert_eq!(show.elapsed(53.0), 3.0, "running from zero");
+        show.toggle_timer(53.0);
+        show.reset_timer(60.0);
+        assert_eq!(show.elapsed(70.0), 0.0, "a paused reset stays paused at zero");
+    }
+
     #[test]
     fn a_transition_keeps_the_old_slide_in_its_own_texture() {
         // #33: the old slide's handle was cloned, so the new slide was rendered into the same
diff --git a/crates/ui-egui/src/status.rs b/crates/ui-egui/src/status.rs
index a6f4eb11..e2fa9d60 100644
--- a/crates/ui-egui/src/status.rs
+++ b/crates/ui-egui/src/status.rs
@@ -138,15 +138,22 @@ pub fn notes_pane(app: &mut SlideApp, ui: &mut Ui) {
                 app.notes_buf.2 = current.clone();
             }
             let mut buf = app.notes_buf.2.clone();
-            let r = ui.add(
-                egui::TextEdit::multiline(&mut buf)
-                    .id(id)
-                    .hint_text("Click to add notes")
-                    .frame(egui::Frame::NONE)
-                    .desired_width(f32::INFINITY)
-                    .desired_rows(2)
-                    .font(theme::font(13.0)),
-            );
+            // Long notes scroll inside the pane instead of spilling over the slide (#221).
+            let r = egui::ScrollArea::vertical()
+                .max_height(ui.available_height())
+                .auto_shrink([false, false])
+                .show(ui, |ui| {
+                    ui.add(
+                        egui::TextEdit::multiline(&mut buf)
+                            .id(id)
+                            .hint_text("Click to add notes")
+                            .frame(egui::Frame::NONE)
+                            .desired_width(f32::INFINITY)
+                            .desired_rows(2)
+                            .font(theme::font(13.0)),
+                    )
+                })
+                .inner;
             app.notes_buf.2 = buf.clone();
             if r.lost_focus() && buf != current {
                 let _ = app.run("slide.notes", json!({"text": buf, "index": idx}));

From 8ac6dc2f47a49cfe657a3130342e988d8dd40e46 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B0=D0=B3=D0=B4=D0=B0=20=D0=9C=2E=D0=93=2E?=
 <mail@mgmagda.ru>
Date: Mon, 12 Oct 2026 15:52:20 +0300
Subject: [PATCH 042/376] Render: an unfilled shape's glow follows its line

A glow always filled the shape's whole silhouette, so a frame with no fill
(a rounded-rectangle border with a soft glow, common in corporate decks)
came out as a solid tinted panel over the slide. PowerPoint glows such a
shape along its outline only and leaves the inside clear; a filled shape's
glow is unchanged.

Checked against PowerPoint's own PDF export of 31 real decks (597 slides):
the affected slides' mean pixel difference drops from ~29 to ~4 (of 255).
---
 crates/render/src/lib.rs   | 17 +++++++++++++----
 crates/render/src/tests.rs | 28 ++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index 6dde577a..fa9eb33a 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -668,7 +668,9 @@ impl Renderer {
         let fill = if let Some(t) = st.tint { Some(Fill::solid(deckcraft_model::ColorRef::rgb(t))) } else { fill };
         // Effects below the shape.
         if let Some(e) = &effects {
-            self.effects_below(ctx, rctx, e, fx_ph, &geo, &fill, m, w, h);
+            // A shape without a fill (an outline, a frame) glows along its line only.
+            let filled = is_pic || fill.as_ref().is_some_and(|f| !matches!(f, Fill::None));
+            self.effects_below(ctx, rctx, e, fx_ph, &geo, &fill, filled, m, w, h);
         }
         let soft = effects.as_ref().and_then(|e| e.soft_edge).filter(|r| *r > 0.0);
         if let Some(r) = soft {
@@ -801,6 +803,7 @@ impl Renderer {
         ph: Option<Rgba>,
         geo: &Geometry,
         fill: &Option<Fill>,
+        filled: bool,
         m: Affine,
         w: f64,
         h: f64,
@@ -837,9 +840,15 @@ impl Renderer {
             ctx.push_layer(None, None, Some((c.a as f32) / 255.0), None, Some(blur(g.radius * 0.35 * k)));
             ctx.set_transform(m);
             ctx.set_paint(color(c.with_alpha(255), 1.0));
-            ctx.set_stroke(kurbo::Stroke::new(g.radius.max(0.0) * 1.2).with_join(kurbo::Join::Round));
-            ctx.stroke_path(&silhouette);
-            ctx.fill_path(&silhouette);
+            if filled {
+                ctx.set_stroke(kurbo::Stroke::new(g.radius.max(0.0) * 1.2).with_join(kurbo::Join::Round));
+                ctx.stroke_path(&silhouette);
+                ctx.fill_path(&silhouette);
+            } else {
+                // The glow spreads its radius to both sides of the line; the inside stays clear.
+                ctx.set_stroke(kurbo::Stroke::new(g.radius.max(0.0) * 2.0).with_join(kurbo::Join::Round));
+                ctx.stroke_path(&silhouette);
+            }
             ctx.pop_layer();
         }
         if let Some(rf) = &e.reflection {
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index ccb4472f..08cee36a 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -124,6 +124,34 @@ fn effects_tables_charts_render() {
     assert!(px[0] < 250, "{px:?}");
 }
 
+#[test]
+fn glow_of_an_unfilled_shape_follows_its_line() {
+    // A frame (no fill, thin line) with a strong glow: the glow lines its edge, the inside stays
+    // the slide's white, as PowerPoint draws it.
+    let glow = |fill: Option<Fill>| {
+        let mut sh = Shape {
+            id: ShapeId(610),
+            xfrm: Some(Xfrm::new(100.0, 100.0, 400.0, 300.0)),
+            fill,
+            line: Some(deckcraft_model::style::Line::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(0, 176, 240)), 0.25)),
+            ..Default::default()
+        };
+        sh.effects = Some(deckcraft_model::Effects {
+            glow: Some(deckcraft_model::style::Glow { color: ColorRef::rgb(deckcraft_color::Rgba::rgb(0, 0, 255)), radius: 8.0 }),
+            ..Default::default()
+        });
+        render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() })
+    };
+    let img = glow(Some(Fill::None));
+    let inside = img.pixel(300, 250);
+    assert!(inside[0] > 245 && inside[1] > 245, "{inside:?}");
+    let edge = img.pixel(300, 97);
+    assert!(edge[0] < 230, "{edge:?}");
+    // A filled shape's glow is still the whole silhouette's (the fill covers its inside).
+    let img = glow(Some(Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 255, 255)))));
+    assert!(img.pixel(300, 94)[0] < 240);
+}
+
 #[test]
 fn placeholder_prompts_only_in_edit_view() {
     let p = Presentation::default();

From f2c27cbba1c12ab30d1a210d3bad2481657c9a28 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B0=D0=B3=D0=B4=D0=B0=20=D0=9C=2E=D0=93=2E?=
 <mail@mgmagda.ru>
Date: Mon, 12 Oct 2026 15:52:20 +0300
Subject: [PATCH 043/376] Text: draw shrink-on-overflow at the scale the file
 was saved with

PowerPoint draws normAutofit text at its saved fontScale/lnSpcReduction;
we ignored them and only shrank when our own layout overflowed, so saved
decks showed larger text and wider line spacing than PowerPoint, with text
running past placeholders. The layout now starts from the saved scale
(nonsense values ignored) and still shrinks further when the text doesn't
fit. Editing the text resets the saved scale so the new text is fitted
afresh, as PowerPoint refits on edit.
---
 crates/engine/src/cmd/text.rs |  4 ++++
 crates/engine/src/tests.rs    | 20 ++++++++++++++++++++
 crates/text/src/lib.rs        | 15 ++++++++++++---
 crates/text/src/tests.rs      | 21 +++++++++++++++++++++
 4 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 48be3a51..3088bcab 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -70,6 +70,10 @@ pub(crate) fn edit_text<T>(s: &mut Session, f: impl FnOnce(&mut TextBody, &mut T
         let mut t = t0.clone();
         let body = body_mut(doc, sel, &t).ok_or_else(|| bad("text", "the text being edited is gone"))?;
         let r = f(body, &mut t);
+        // The saved shrink-on-overflow scale was for the old text: fit the new text afresh.
+        if let Some(AutoFit::Shrink { font_scale, line_reduction }) = &mut body.body.autofit {
+            (*font_scale, *line_reduction) = (1.0, 0.0);
+        }
         sel.text = Some(t);
         Ok(r)
     })?;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..b18c5a7e 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -66,6 +66,26 @@ fn text_editing_flow() {
     assert_eq!(s.doc().unwrap().selection.shapes.len(), 1);
 }
 
+#[test]
+fn editing_text_refits_a_saved_shrink() {
+    use deckcraft_model::text::AutoFit;
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id;
+    s.execute("text.edit", &json!({"id": title.0})).unwrap();
+    s.execute("text.insert", &json!({"text": "Hi"})).unwrap();
+    // As if opened from a file PowerPoint saved shrunk.
+    s.edit(|doc, sel| {
+        let shapes = crate::shapes_mut(doc, sel).unwrap();
+        let sh = deckcraft_model::find_shape_mut(shapes, title).unwrap();
+        sh.text.as_mut().unwrap().body.autofit = Some(AutoFit::Shrink { font_scale: 0.5, line_reduction: 0.2 });
+        Ok(())
+    })
+    .unwrap();
+    s.execute("text.insert", &json!({"text": "!"})).unwrap();
+    let sh = s.doc().unwrap().shape(title).cloned().unwrap();
+    assert_eq!(sh.text.unwrap().body.autofit, Some(AutoFit::Shrink { font_scale: 1.0, line_reduction: 0.0 }));
+}
+
 #[test]
 fn smart_quotes_and_autocorrect() {
     let mut s = session();
diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index 225f4afb..684ed4a8 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -825,16 +825,25 @@ fn tab_advance(x: f64, stops: &[f64], default_tab: f64) -> f64 {
 pub fn layout(ctx: &Ctx, shape: &Shape, body: &TextBody, opts: &Opts) -> TextLayout {
     let bp = resolve::body(ctx, shape);
     let autofit = bp.autofit.unwrap_or(AutoFit::None);
-    let mut l = layout_scaled(ctx, shape, body, &bp, opts, 1.0, 0.0);
+    // Shrink on overflow starts from the scale the file was saved with (`fontScale`,
+    // `lnSpcReduction`), which is what PowerPoint draws; editing the text resets it.
+    let (scale0, reduce0) = match (autofit, opts.no_shrink) {
+        (AutoFit::Shrink { font_scale, line_reduction }, false) => (
+            if font_scale.is_finite() { font_scale.clamp(0.1, 1.0) } else { 1.0 },
+            if line_reduction.is_finite() { line_reduction.clamp(0.0, 0.2) } else { 0.0 },
+        ),
+        _ => (1.0, 0.0),
+    };
+    let mut l = layout_scaled(ctx, shape, body, &bp, opts, scale0, reduce0);
     if let (AutoFit::Shrink { .. }, false) = (autofit, opts.no_shrink)
         && l.overflow
     {
         // Binary search the largest scale that fits (steps like 90%, 80%… with line reduction).
-        let (mut lo, mut hi) = (0.1_f64, 1.0_f64);
+        let (mut lo, mut hi) = (0.1_f64, scale0);
         let mut best = None;
         for _ in 0..12 {
             let mid = (lo + hi) / 2.0;
-            let red: f64 = ((1.0 - mid) * 0.8_f64).min(0.2);
+            let red: f64 = ((1.0 - mid) * 0.8_f64).min(0.2).max(reduce0);
             let t = layout_scaled(ctx, shape, body, &bp, opts, mid, red);
             if t.overflow {
                 hi = mid;
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index f3d5db5d..fcba4645 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -54,6 +54,27 @@ fn shrink_on_overflow() {
     assert!(!l.overflow || l.font_scale <= 0.11);
 }
 
+#[test]
+fn saved_shrink_scale_is_drawn() {
+    // A file saved with fontScale 62.5% and lnSpcReduction 20% draws at that scale even though
+    // the text would fit at full size, as PowerPoint draws it.
+    let (p, mut sh) = setup("Short", 600.0, 300.0);
+    sh.text.as_mut().unwrap().body.autofit = Some(AutoFit::Shrink { font_scale: 0.625, line_reduction: 0.2 });
+    let l = lay(&p, &sh, 600.0, 300.0);
+    assert_eq!((l.font_scale, l.line_reduction), (0.625, 0.2));
+    // Text that doesn't fit even at the saved scale shrinks further.
+    let text = (0..30).map(|i| format!("Line number {i}")).collect::<Vec<_>>().join("\n");
+    let (p, mut sh) = setup(&text, 600.0, 200.0);
+    sh.text.as_mut().unwrap().body.autofit = Some(AutoFit::Shrink { font_scale: 0.9, line_reduction: 0.1 });
+    let l = lay(&p, &sh, 600.0, 200.0);
+    assert!(l.font_scale < 0.9 && l.line_reduction >= 0.1, "{} {}", l.font_scale, l.line_reduction);
+    // Nonsense saved values are ignored.
+    let (p, mut sh) = setup("Short", 600.0, 300.0);
+    sh.text.as_mut().unwrap().body.autofit = Some(AutoFit::Shrink { font_scale: f64::NAN, line_reduction: 5.0 });
+    let l = lay(&p, &sh, 600.0, 300.0);
+    assert_eq!((l.font_scale, l.line_reduction), (1.0, 0.2));
+}
+
 #[test]
 fn caret_and_hit_roundtrip() {
     let (p, sh) = setup("Hello world", 600.0, 100.0);

From aa65bb8af3d0dde141ff5bbb650126b9a3884126 Mon Sep 17 00:00:00 2001
From: justinjohn0306 <justinjohn0306@gmail.com>
Date: Mon, 12 Oct 2026 18:31:10 +0530
Subject: [PATCH 044/376] Animations: PowerPoint's Float Down (preset 47)
 imports as Float, down (#147)

PowerPoint writes Float In / Float Out with the Float Down option as its
own preset, 47 (Descend), not as preset 42 with a direction. DeckCraft
only knew 42, so a Float Down entrance or exit imported as a plain fade,
which is what the issue's video shows: the buildings fade out in place
instead of sinking. Preset 47 now imports as float / floatOut with the
"d" option and is written back as 47.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/pptx/src/maps.rs         |  4 ++++
 crates/pptx/src/read/timing.rs  |  8 +++++++-
 crates/pptx/src/write/timing.rs |  6 +++++-
 crates/pptx/tests/roundtrip.rs  | 25 +++++++++++++++++++++++++
 4 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/crates/pptx/src/maps.rs b/crates/pptx/src/maps.rs
index 70b9f5cf..1d40c574 100644
--- a/crates/pptx/src/maps.rs
+++ b/crates/pptx/src/maps.rs
@@ -310,6 +310,10 @@ pub fn fallback_effect(class: AnimClass) -> &'static str {
 
 /// The preset id to write for an animation.
 pub fn preset_for(a: &deckcraft_model::Animation) -> u32 {
+    // Float Down is PowerPoint's preset 47 (Float Up is 42).
+    if matches!(a.effect.as_str(), "float" | "floatOut") && a.option == "d" {
+        return 47;
+    }
     if let Some(p) = a.preset_id {
         let consistent = match effect_for_preset(a.class, p) {
             Some(e) => e == a.effect,
diff --git a/crates/pptx/src/read/timing.rs b/crates/pptx/src/read/timing.rs
index 500bb485..9548f3f4 100644
--- a/crates/pptx/src/read/timing.rs
+++ b/crates/pptx/src/read/timing.rs
@@ -119,6 +119,12 @@ pub fn animations(imp: &mut Imp, part: &Part, ctx: &IdCtx, timing: &El, _shapes:
         let Some(shape) = ctx.lookup(file_id) else { continue };
         let paragraph = tgt.path(&["txEl", "pRg"]).and_then(|p| p.u32("st"));
         let effect = maps::effect_for_preset(class, preset).unwrap_or_else(|| maps::fallback_effect(class));
+        // PowerPoint writes Float Down as its own preset (47), not as Float with a direction.
+        let (effect, option) = match (class, preset) {
+            (AnimClass::Entrance, 47) => ("float", "d".to_string()),
+            (AnimClass::Exit, 47) => ("floatOut", "d".to_string()),
+            _ => (effect, maps::option_from_subtype(effect, sub)),
+        };
         let start = match c.attr("nodeType") {
             Some("clickEffect") => AnimStart::OnClick,
             Some("afterEffect") => AnimStart::AfterPrevious,
@@ -128,7 +134,7 @@ pub fn animations(imp: &mut Imp, part: &Part, ctx: &IdCtx, timing: &El, _shapes:
             shape,
             class,
             effect: effect.to_string(),
-            option: maps::option_from_subtype(effect, sub),
+            option,
             start,
             duration_ms: max_dur(c, 0).unwrap_or(0),
             delay_ms: c.path(&["stCondLst", "cond"]).and_then(|d| ms_attr(d, "delay")).unwrap_or(0),
diff --git a/crates/pptx/src/write/timing.rs b/crates/pptx/src/write/timing.rs
index 56ba5a9d..fcb8fe58 100644
--- a/crates/pptx/src/write/timing.rs
+++ b/crates/pptx/src/write/timing.rs
@@ -430,7 +430,11 @@ fn effect_par(w: &mut W, x: &mut Exp, ids: &mut Ids, e: &Eff, first_in_click: bo
     };
     let _ = first_in_click;
     let preset = crate::maps::preset_for(a);
-    let sub = crate::maps::subtype_from_option(&a.effect, &a.option).or(a.preset_subtype.filter(|_| a.preset_id == Some(preset))).unwrap_or(0);
+    let sub = if preset == 47 {
+        0
+    } else {
+        crate::maps::subtype_from_option(&a.effect, &a.option).or(a.preset_subtype.filter(|_| a.preset_id == Some(preset))).unwrap_or(0)
+    };
     let repeat = match a.repeat {
         u32::MAX => Some("indefinite".to_string()),
         0 | 1 => None,
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index 420a3921..3f67f821 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -730,3 +730,28 @@ fn date_fields_keep_their_type_and_saved_text() {
         assert_eq!(by_name(&q.slides[0], name).text, by_name(&p.slides[0], name).text, "{name}");
     }
 }
+
+/// #147: PowerPoint's Float Down is preset 47 (Float Up is 42); it imported as a plain fade.
+#[test]
+fn float_down_is_preset_47_both_ways() {
+    let mut p = defaults::new_presentation(None);
+    let mut s = new_slide(&mut p, "Float");
+    let sh = shape(&mut p, "Building", 0.0, 0.0, 100.0, 100.0);
+    let id = sh.id;
+    s.shapes.push(sh);
+    s.animations = vec![
+        Animation { shape: id, class: AnimClass::Entrance, effect: "float".into(), option: "d".into(), ..Default::default() },
+        Animation { shape: id, class: AnimClass::Exit, effect: "floatOut".into(), option: "d".into(), ..Default::default() },
+        Animation { shape: id, class: AnimClass::Exit, effect: "floatOut".into(), option: "u".into(), ..Default::default() },
+    ];
+    p.slides.push(Arc::new(s));
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut z = zip::ZipArchive::new(std::io::Cursor::new(&bytes)).expect("zip");
+    let xml = std::io::read_to_string(z.by_name("ppt/slides/slide2.xml").expect("slide")).expect("read");
+    assert!(xml.contains(r#"presetID="47" presetClass="entr" presetSubtype="0""#), "{xml}");
+    assert!(xml.contains(r#"presetID="47" presetClass="exit" presetSubtype="0""#), "{xml}");
+    assert!(xml.contains(r#"presetID="42" presetClass="exit" presetSubtype="0""#), "{xml}");
+    let q = deckcraft_pptx::import(&bytes).expect("import");
+    let got: Vec<(&str, &str)> = q.slides[1].animations.iter().map(|a| (a.effect.as_str(), a.option.as_str())).collect();
+    assert_eq!(got, [("float", "d"), ("floatOut", "d"), ("floatOut", "u")]);
+}

From dc6ea04a8fa41737c494d62a490ff86b4919d865 Mon Sep 17 00:00:00 2001
From: Isaac Levine <isaacmlevine4@gmail.com>
Date: Sun, 11 Oct 2026 23:44:40 -0400
Subject: [PATCH 045/376] Engine: check automation read and write roots on
 every path a command reads or writes

---
 crates/engine/src/cmd/file.rs    |  12 +-
 crates/engine/src/cmd/insert.rs  |   3 +-
 crates/engine/src/file_access.rs | 479 +++++++++++++++++++++++++++++++
 crates/engine/src/io.rs          |  35 +++
 crates/engine/src/lib.rs         |   2 +
 5 files changed, 519 insertions(+), 12 deletions(-)
 create mode 100644 crates/engine/src/file_access.rs
 create mode 100644 crates/engine/src/io.rs

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index 55aac8bd..87c712c9 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -85,7 +85,7 @@ pub fn add_opened(s: &mut Session, name: &str, path: Option<String>, p: Presenta
 #[cfg(not(target_arch = "wasm32"))]
 fn open(s: &mut Session, p: &Value) -> Result<Value> {
     let path = str_param(p, "path").ok_or_else(|| bad("file.open", "missing `path`"))?;
-    let bytes = std::fs::read(path).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
+    let bytes = crate::io::read_file(path).map_err(EngineError::Other)?;
     let doc = open_presentation(path, &bytes)?;
     let native = deckcraft_format::sniff(&bytes) || deckcraft_pptx::sniff(&bytes);
     let i = add_opened(s, path, native.then(|| path.to_string()), doc);
@@ -167,16 +167,8 @@ fn mark_saved(s: &mut Session, path: Option<String>) -> Result<()> {
     Ok(())
 }
 
-#[cfg(not(target_arch = "wasm32"))]
 fn write_file(path: &str, bytes: &[u8]) -> Result<()> {
-    // Write to a temporary sibling then rename, so a failed save never truncates the old file.
-    let tmp = format!("{path}.saving");
-    std::fs::write(&tmp, bytes).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
-    std::fs::rename(&tmp, path).map_err(|e| EngineError::Other(format!("{path}: {e}")))
-}
-#[cfg(target_arch = "wasm32")]
-fn write_file(_path: &str, _bytes: &[u8]) -> Result<()> {
-    Err(EngineError::Other("saving to a path is not available in the browser".into()))
+    crate::io::write_file(path, bytes).map_err(EngineError::Other)
 }
 
 fn save(s: &mut Session, p: &Value) -> Result<Value> {
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..d786e2c6 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -222,9 +222,8 @@ pub(crate) fn media_bytes(p: &Value, cmd: &str) -> Result<(String, Vec<u8>)> {
         let bytes = base64_decode(d).ok_or_else(|| bad(cmd, "invalid base64 `data`"))?;
         return Ok((str_param(p, "name").unwrap_or("media").to_string(), bytes));
     }
-    #[cfg(not(target_arch = "wasm32"))]
     if let Some(path) = str_param(p, "path") {
-        let bytes = std::fs::read(path).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
+        let bytes = crate::io::read_file(path).map_err(EngineError::Other)?;
         let name = std::path::Path::new(path).file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| "media".into());
         return Ok((name, bytes));
     }
diff --git a/crates/engine/src/file_access.rs b/crates/engine/src/file_access.rs
new file mode 100644
index 00000000..d5ee0a99
--- /dev/null
+++ b/crates/engine/src/file_access.rs
@@ -0,0 +1,479 @@
+//! The folders automation may read and write.
+//!
+//! `deckcraft-cli mcp --automation-read-root <dir> --automation-write-root <dir>` confines the
+//! files an agent's commands reach. [`AutomationRoots`] holds the two folders. While they are in force, every path a command
+//! reads goes through [`check_read`] and every path it writes through [`check_write`]:
+//!
+//! - The path is made absolute against the working directory, as the file system reads it. Its
+//!   links are followed: for a file that doesn't exist yet, the links of its nearest existing
+//!   folder, the rest of the path being plain names (`..` below a missing folder is refused, and so
+//!   is a link that leads nowhere).
+//! - The result must lie inside the root, compared by whole components (`/work2` isn't inside
+//!   `/work`), without regard to case on Windows.
+//! - Read and write access are separate: a root given alone grants only its own kind of access.
+//!
+//! Roots are in force on a thread inside [`confine`], and in the whole process after
+//! [`confine_process`] (`deckcraft-cli mcp`), except inside [`unconfined`]. Without roots
+//! nothing is checked.
+//!
+//! A path is checked, then opened: a process that can change the folders in between (swapping in
+//! a link) can still win that race. The roots keep an agent to the files it was given; they don't
+//! guard against other programs on the computer.
+
+use std::cell::RefCell;
+use std::ffi::OsString;
+use std::path::{Component, Path, PathBuf};
+use std::sync::{Arc, OnceLock};
+
+/// Read access or write access.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Access {
+    Read,
+    Write,
+}
+
+/// The folders automation may read and write; a root left out grants no access of its kind.
+#[derive(Debug)]
+pub struct AutomationRoots {
+    read: Option<Root>,
+    write: Option<Root>,
+}
+
+#[derive(Debug)]
+struct Root {
+    /// The folder made absolute, links followed: what paths are compared with.
+    resolved: PathBuf,
+    /// The same without Windows' `\\?\` prefix, for people.
+    shown: PathBuf,
+}
+
+impl Root {
+    /// The folder at `path`, which must exist.
+    fn open(path: &Path, access: Access) -> Result<Self, String> {
+        let kind = match access {
+            Access::Read => "read",
+            Access::Write => "write",
+        };
+        let resolved = std::fs::canonicalize(path)
+            .and_then(|p| if p.is_dir() { Ok(p) } else { Err(std::io::ErrorKind::NotADirectory.into()) })
+            .map_err(|e| format!("cannot open the automation {kind} root `{}`: {e}", path.display()))?;
+        Ok(Self { shown: plain(resolved.clone()), resolved })
+    }
+}
+
+impl AutomationRoots {
+    /// The roots `read` and `write`, which must be existing folders; `None` when neither is given
+    /// (nothing is confined then).
+    pub fn new(read: Option<&Path>, write: Option<&Path>) -> Result<Option<Arc<Self>>, String> {
+        if read.is_none() && write.is_none() {
+            return Ok(None);
+        }
+        let read = read.map(|p| Root::open(p, Access::Read)).transpose()?;
+        let write = write.map(|p| Root::open(p, Access::Write)).transpose()?;
+        Ok(Some(Arc::new(Self { read, write })))
+    }
+
+    /// The read root, absolute with its links followed.
+    pub fn read_root(&self) -> Option<&Path> {
+        self.read.as_ref().map(|r| r.shown.as_path())
+    }
+
+    /// The write root, absolute with its links followed.
+    pub fn write_root(&self) -> Option<&Path> {
+        self.write.as_ref().map(|r| r.shown.as_path())
+    }
+
+    /// May the file or folder at `path` be read (or written)? `Err` says why not.
+    pub fn check(&self, path: &str, access: Access) -> Result<(), String> {
+        let root = match access {
+            Access::Read => self.read.as_ref(),
+            Access::Write => self.write.as_ref(),
+        };
+        let Some(Root { resolved: folder, shown }) = root else {
+            return match access {
+                Access::Read => Err(format!("automation filesystem access is not granted: read authority is absent: {path}")),
+                Access::Write => Err(format!("automation filesystem access is not granted: write authority is absent: {path}")),
+            };
+        };
+        if inside(&resolve(path)?, folder) {
+            return Ok(());
+        }
+        let root = shown.display();
+        match access {
+            Access::Read => Err(format!("automation path rejected: outside the read root {root}: {path}")),
+            Access::Write => Err(format!("automation path rejected: outside the write root {root}: {path}")),
+        }
+    }
+}
+
+/// Where the roots are in force on a thread ([`confine`], [`unconfined`]).
+#[derive(Clone, Debug)]
+enum Scope {
+    Confined(Arc<AutomationRoots>),
+    Unconfined,
+}
+
+thread_local! {
+    /// This thread's scope; `None`: the process's roots ([`confine_process`]).
+    static SCOPE: RefCell<Option<Scope>> = const { RefCell::new(None) };
+}
+
+/// The roots in force in every thread outside [`confine`] and [`unconfined`].
+static PROCESS: OnceLock<Arc<AutomationRoots>> = OnceLock::new();
+
+/// Put `roots` in force in the whole process, for good. `false` when roots were in force already
+/// (they stay as they were).
+pub fn confine_process(roots: Arc<AutomationRoots>) -> bool {
+    PROCESS.set(roots).is_ok()
+}
+
+/// Puts the scope it replaced back when dropped (also when `f` panics).
+struct Restore(Option<Scope>);
+
+impl Drop for Restore {
+    fn drop(&mut self) {
+        let previous = self.0.take();
+        SCOPE.with(|s| *s.borrow_mut() = previous);
+    }
+}
+
+fn with_scope<T>(scope: Option<Scope>, f: impl FnOnce() -> T) -> T {
+    let _restore = Restore(SCOPE.with(|s| s.replace(scope)));
+    f()
+}
+
+/// Run `f` with `roots` in force on this thread (`None`: as things stand).
+pub fn confine<T>(roots: Option<&Arc<AutomationRoots>>, f: impl FnOnce() -> T) -> T {
+    match roots {
+        Some(r) => with_scope(Some(Scope::Confined(r.clone())), f),
+        None => f(),
+    }
+}
+
+/// Run `f` with no roots in force on this thread: what the person at the keyboard does, and the
+/// app's own folders.
+pub fn unconfined<T>(f: impl FnOnce() -> T) -> T {
+    with_scope(Some(Scope::Unconfined), f)
+}
+
+/// The roots in force on this thread, if any.
+pub fn current() -> Option<Arc<AutomationRoots>> {
+    match SCOPE.with(|s| s.borrow().clone()) {
+        Some(Scope::Confined(r)) => Some(r),
+        Some(Scope::Unconfined) => None,
+        None => PROCESS.get().cloned(),
+    }
+}
+
+/// `path` without Windows' `\\?\` prefix (which `canonicalize` adds), for people to read.
+fn plain(path: PathBuf) -> PathBuf {
+    if !cfg!(windows) {
+        return path;
+    }
+    let text = path.to_string_lossy();
+    if let Some(rest) = text.strip_prefix(r"\\?\UNC\") {
+        return PathBuf::from(format!(r"\\{rest}"));
+    }
+    match text.strip_prefix(r"\\?\") {
+        Some(rest) => PathBuf::from(rest),
+        None => path,
+    }
+}
+
+/// May `path` be read here? Always, without roots in force.
+pub fn check_read(path: &str) -> Result<(), String> {
+    current().map_or(Ok(()), |r| r.check(path, Access::Read))
+}
+
+/// May `path` be written here? Always, without roots in force.
+pub fn check_write(path: &str) -> Result<(), String> {
+    current().map_or(Ok(()), |r| r.check(path, Access::Write))
+}
+
+/// `path` made absolute with its links followed; for a path that doesn't exist (yet), its nearest
+/// existing folder's links followed and the rest appended.
+fn resolve(path: &str) -> Result<PathBuf, String> {
+    if path.is_empty() {
+        return Err("automation path rejected: path is empty".into());
+    }
+    // Checked as given: making `…\NUL` absolute gives the device path `\\.\NUL` on Windows.
+    if cfg!(windows) && Path::new(path).components().any(|c| matches!(c, Component::Normal(n) if is_device_name(&n.to_string_lossy()))) {
+        return Err(format!("automation path rejected: reserved device names are not allowed: {path}"));
+    }
+    let absolute = std::path::absolute(path).map_err(|e| format!("automation path rejected: cannot resolve {path}: {e}"))?;
+    // The names below the nearest existing folder, last first.
+    let mut missing: Vec<OsString> = vec![];
+    let mut at = absolute.as_path();
+    loop {
+        match std::fs::canonicalize(at) {
+            Ok(mut found) => {
+                found.extend(missing.iter().rev());
+                return Ok(found);
+            }
+            Err(e) => match std::fs::symlink_metadata(at) {
+                Ok(m) if m.file_type().is_symlink() => return Err(format!("automation path rejected: a link that leads nowhere: {path}")),
+                // There, yet its real path can't be had (no permission): nothing to compare.
+                Ok(_) => return Err(format!("automation path rejected: cannot resolve {path}: {e}")),
+                Err(e) if e.kind() == std::io::ErrorKind::NotFound => {}
+                Err(e) => return Err(format!("automation path rejected: cannot resolve {path}: {e}")),
+            },
+        }
+        let parent = at.parent();
+        match (at.components().next_back(), parent) {
+            (Some(Component::Normal(name)), Some(parent)) => {
+                missing.push(name.to_os_string());
+                at = parent;
+            }
+            (Some(Component::ParentDir), _) => {
+                return Err(format!("automation path rejected: parent traversal below a folder that doesn't exist: {path}"));
+            }
+            // Down to the root (or drive) and it doesn't exist either.
+            _ => {
+                let e = std::io::Error::from(std::io::ErrorKind::NotFound);
+                return Err(format!("automation path rejected: cannot resolve {path}: {e}"));
+            }
+        }
+    }
+}
+
+/// Is `path` (resolved) `root` or inside it, component by component (without regard to case on
+/// Windows, whose file systems ignore it)?
+fn inside(path: &Path, root: &Path) -> bool {
+    let mut path = path.components();
+    root.components().all(|r| path.next().is_some_and(|p| same_component(p, r)))
+}
+
+fn same_component(a: Component, b: Component) -> bool {
+    if a == b {
+        return true;
+    }
+    if !cfg!(windows) {
+        return false;
+    }
+    match (a.as_os_str().to_str(), b.as_os_str().to_str()) {
+        (Some(a), Some(b)) => a.to_lowercase() == b.to_lowercase(),
+        _ => false,
+    }
+}
+
+/// A Windows device name (`CON`, `NUL`, `COM1`… also with an extension), which names no file.
+fn is_device_name(component: &str) -> bool {
+    let stem = component.split('.').next().unwrap_or(component).trim_end_matches(' ').to_ascii_uppercase();
+    let numbered = |prefix: &str| stem.strip_prefix(prefix).is_some_and(|n| matches!(n, "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"));
+    matches!(stem.as_str(), "CON" | "PRN" | "AUX" | "NUL" | "CLOCK$" | "CONIN$" | "CONOUT$") || numbered("COM") || numbered("LPT")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// A fresh folder holding `in` (read root), `out` (write root) and `outside`.
+    fn folders(name: &str) -> (PathBuf, Arc<AutomationRoots>) {
+        let base = std::env::temp_dir().join(format!("dc-file-access-{name}-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&base);
+        for d in ["in/sub", "out", "outside", "in2"] {
+            std::fs::create_dir_all(base.join(d)).unwrap();
+        }
+        std::fs::write(base.join("in/a.deckcraft"), "x").unwrap();
+        std::fs::write(base.join("outside/secret.deckcraft"), "x").unwrap();
+        let roots = AutomationRoots::new(Some(&base.join("in")), Some(&base.join("out"))).unwrap().unwrap();
+        (base, roots)
+    }
+
+    fn s(p: PathBuf) -> String {
+        p.to_string_lossy().into_owned()
+    }
+
+    #[test]
+    fn paths_inside_the_roots_pass_and_others_dont() {
+        let (base, roots) = folders("inside");
+        assert_eq!(roots.check(&s(base.join("in/a.deckcraft")), Access::Read), Ok(()));
+        assert_eq!(roots.check(&s(base.join("in")), Access::Read), Ok(()), "the root itself");
+        assert_eq!(roots.check(&s(base.join("in/sub/new.deckcraft")), Access::Read), Ok(()), "missing files are checked by their folder");
+        assert_eq!(roots.check(&s(base.join("out/new/deeper/x.png")), Access::Write), Ok(()), "and by their nearest folder");
+        let e = roots.check(&s(base.join("outside/secret.deckcraft")), Access::Read).unwrap_err();
+        assert!(e.starts_with("automation path rejected: outside the read root"), "{e}");
+        // Read and write access are separate.
+        let e = roots.check(&s(base.join("in/a.deckcraft")), Access::Write).unwrap_err();
+        assert!(e.contains("outside the write root"), "{e}");
+        assert!(roots.check(&s(base.join("out/x.png")), Access::Read).unwrap_err().contains("outside the read root"));
+        let _ = std::fs::remove_dir_all(base);
+    }
+
+    #[test]
+    fn a_sibling_with_the_same_prefix_is_outside() {
+        let (base, roots) = folders("prefix");
+        std::fs::write(base.join("in2/b.deckcraft"), "x").unwrap();
+        assert!(roots.check(&s(base.join("in2/b.deckcraft")), Access::Read).is_err(), "in2 is not inside in");
+        assert!(roots.check(&format!("{}2/c.deckcraft", s(base.join("in"))), Access::Read).is_err());
+        let _ = std::fs::remove_dir_all(base);
+    }
+
+    #[test]
+    fn parent_traversal_is_resolved_or_refused() {
+        let (base, roots) = folders("dotdot");
+        let sep = std::path::MAIN_SEPARATOR;
+        let up = format!("{}{sep}..{sep}outside{sep}secret.deckcraft", s(base.join("in")));
+        assert!(roots.check(&up, Access::Read).unwrap_err().contains("outside the read root"), "`..` out of the root");
+        let back = format!("{}{sep}..{sep}a.deckcraft", s(base.join("in/sub")));
+        assert_eq!(roots.check(&back, Access::Read), Ok(()), "`..` that stays inside");
+        let missing = format!("{}{sep}nope{sep}..{sep}..{sep}outside{sep}x.deckcraft", s(base.join("out")));
+        let e = roots.check(&missing, Access::Write).unwrap_err();
+        // Windows resolves `..` by name first (so does opening the file there): then it's outside.
+        assert!(e.contains("parent traversal below a folder that doesn't exist") || e.contains("outside the write root"), "{e}");
+        let _ = std::fs::remove_dir_all(base);
+    }
+
+    #[test]
+    fn relative_paths_resolve_against_the_working_directory() {
+        let (base, roots) = folders("relative");
+        // The tests' working directory is the crate's folder: not inside the roots.
+        assert!(roots.check("a.deckcraft", Access::Read).unwrap_err().contains("outside the read root"));
+        assert!(roots.check("", Access::Read).unwrap_err().contains("path is empty"));
+        let _ = std::fs::remove_dir_all(base);
+    }
+
+    #[test]
+    fn a_missing_root_is_an_error_and_none_is_no_confinement() {
+        let (base, _) = folders("missing");
+        let e = AutomationRoots::new(Some(&base.join("nope")), None).unwrap_err();
+        assert!(e.starts_with("cannot open the automation read root"), "{e}");
+        let e = AutomationRoots::new(None, Some(&base.join("in/a.deckcraft"))).unwrap_err();
+        assert!(
+            e.starts_with("cannot open the automation write root")
+                && e.ends_with(&std::io::Error::from(std::io::ErrorKind::NotADirectory).to_string()),
+            "{e}"
+        );
+        assert!(AutomationRoots::new(Some(Path::new("")), None).unwrap_err().starts_with("cannot open the automation read root ``"));
+        assert!(AutomationRoots::new(None, None).unwrap().is_none());
+        // One root alone grants only its own access.
+        let read_only = AutomationRoots::new(Some(&base.join("in")), None).unwrap().unwrap();
+        let e = read_only.check(&s(base.join("in/x.deckcraft")), Access::Write).unwrap_err();
+        assert!(e.contains("write authority is absent"), "{e}");
+        let _ = std::fs::remove_dir_all(base);
+    }
+
+    #[test]
+    fn links_are_followed_before_comparing() {
+        let (base, roots) = folders("links");
+        #[cfg(unix)]
+        let made = |target: &Path, link: &Path| std::os::unix::fs::symlink(target, link).is_ok();
+        #[cfg(windows)]
+        let made = |target: &Path, link: &Path| {
+            let made =
+                if target.is_dir() { std::os::windows::fs::symlink_dir(target, link) } else { std::os::windows::fs::symlink_file(target, link) };
+            made.is_ok()
+        };
+        #[cfg(not(any(unix, windows)))]
+        let made = |_: &Path, _: &Path| false;
+        // Windows needs Developer Mode or elevation to make links: nothing to test without them.
+        if !made(&base.join("outside/secret.deckcraft"), &base.join("in/leak.deckcraft")) {
+            eprintln!("skipped: symbolic links can't be made here");
+            let _ = std::fs::remove_dir_all(base);
+            return;
+        }
+        assert!(roots.check(&s(base.join("in/leak.deckcraft")), Access::Read).unwrap_err().contains("outside the read root"), "a file link out");
+        assert!(made(&base.join("outside"), &base.join("out/away")));
+        let e = roots.check(&s(base.join("out/away/new.png")), Access::Write).unwrap_err();
+        assert!(e.contains("outside the write root"), "a folder link out: {e}");
+        assert!(made(&base.join("outside/gone.deckcraft"), &base.join("out/dangling.png")));
+        let e = roots.check(&s(base.join("out/dangling.png")), Access::Write).unwrap_err();
+        assert!(e.contains("a link that leads nowhere"), "writing would create the file outside: {e}");
+        // A link to a folder inside the root stays inside.
+        assert!(made(&base.join("in/sub"), &base.join("in/alias")));
+        assert_eq!(roots.check(&s(base.join("in/alias/x.deckcraft")), Access::Read), Ok(()));
+        // A root given through a link is the folder it leads to.
+        assert!(made(&base.join("in"), &base.join("in-link")));
+        let linked = AutomationRoots::new(Some(&base.join("in-link")), None).unwrap().unwrap();
+        assert_eq!(linked.check(&s(base.join("in/a.deckcraft")), Access::Read), Ok(()));
+        let _ = std::fs::remove_dir_all(base);
+    }
+
+    #[cfg(windows)]
+    #[test]
+    fn windows_ignores_case_and_refuses_devices() {
+        let (base, roots) = folders("case");
+        let upper = s(base.join("IN/a.deckcraft"));
+        assert_eq!(roots.check(&upper, Access::Read), Ok(()), "{upper}");
+        assert_eq!(roots.check(&s(base.join("In/Sub/New.deckcraft")), Access::Read), Ok(()));
+        let e = roots.check(&s(base.join("out/NUL")), Access::Write).unwrap_err();
+        assert!(e.contains("reserved device names"), "{e}");
+        assert!(roots.check(&s(base.join("out/com1.txt")), Access::Write).is_err());
+        assert_eq!(roots.check(&s(base.join("out/console.txt")), Access::Write), Ok(()));
+        let _ = std::fs::remove_dir_all(base);
+    }
+
+    #[test]
+    fn scopes_nest_and_stay_on_their_thread() {
+        let (base, roots) = folders("scopes");
+        let outside = s(base.join("outside/secret.deckcraft"));
+        assert_eq!(check_read(&outside), Ok(()), "nothing is confined by default");
+        confine(Some(&roots), || {
+            assert!(check_read(&outside).is_err());
+            assert_eq!(unconfined(|| check_read(&outside)), Ok(()));
+            assert!(check_read(&outside).is_err(), "restored after unconfined");
+            let o = outside.clone();
+            let there = std::thread::spawn(move || check_read(&o).is_ok()).join().unwrap();
+            assert!(there, "another thread is not confined by this thread's scope");
+        });
+        assert_eq!(check_read(&outside), Ok(()), "restored after confine");
+        let r = std::panic::catch_unwind(|| confine(Some(&roots), || panic!("boom")));
+        assert!(r.is_err());
+        assert_eq!(check_read(&outside), Ok(()), "restored after a panic");
+        assert_eq!(confine(None, || check_read(&outside)), Ok(()));
+        let _ = std::fs::remove_dir_all(base);
+    }
+
+    #[test]
+    fn device_names() {
+        for d in ["CON", "nul", "Com1", "LPT9.txt", "aux.deckcraft", "NUL "] {
+            assert!(is_device_name(d), "{d}");
+        }
+        for f in ["console", "com10", "COM0", "lpt", "a.deckcraft", "nul-x"] {
+            assert!(!is_device_name(f), "{f}");
+        }
+    }
+
+    /// Every file a command reads or writes by path goes through `io` (`read_file`,
+    /// `write_file`), which check the roots. Engine code that reaches for `std::fs` itself would
+    /// bypass them, so none may: every file under `src/` (commands, `lib.rs`, `guard.rs`...)
+    /// except `io.rs`, this module, `recovery.rs` (the recovery folder is set by the host
+    /// application, never by a command's path, and a headless session has none) and the test
+    /// files.
+    #[test]
+    fn commands_do_not_touch_the_file_system_themselves() {
+        fn walk(dir: &Path, files: &mut Vec<PathBuf>) {
+            for entry in std::fs::read_dir(dir).unwrap() {
+                let path = entry.unwrap().path();
+                if path.is_dir() {
+                    walk(&path, files);
+                } else if path.extension().is_some_and(|e| e == "rs") {
+                    files.push(path);
+                }
+            }
+        }
+        let src = Path::new(env!("CARGO_MANIFEST_DIR")).join("src");
+        let mut files = vec![];
+        walk(&src, &mut files);
+        assert!(files.iter().any(|f| f.ends_with("lib.rs")) && files.iter().any(|f| f.ends_with("cmd/file.rs")), "{files:?}");
+        let mut offenders = vec![];
+        for path in files {
+            let name = path.file_name().and_then(|n| n.to_str()).unwrap_or("");
+            // `io` and this module are the checked gateway; `tests*.rs` are test-only modules.
+            if path.parent() == Some(src.as_path()) && matches!(name, "io.rs" | "file_access.rs" | "recovery.rs") || name.starts_with("tests") {
+                continue;
+            }
+            let text = std::fs::read_to_string(&path).unwrap();
+            // Test modules (which build their own fixtures) come last in each file.
+            let code = text.split("#[cfg(test)]").next().unwrap_or("");
+            for (n, line) in code.lines().enumerate() {
+                let line = line.trim_start();
+                let touches = ["std::fs", "File::open", "File::create", "OpenOptions"].iter().any(|w| line.contains(w));
+                if !line.starts_with("//") && touches {
+                    offenders.push(format!("{}:{}: {line}", path.display(), n + 1));
+                }
+            }
+        }
+        assert!(offenders.is_empty(), "use crate::io::{{read_file, write_file}}: {offenders:#?}");
+    }
+}
diff --git a/crates/engine/src/io.rs b/crates/engine/src/io.rs
new file mode 100644
index 00000000..0ae00c3e
--- /dev/null
+++ b/crates/engine/src/io.rs
@@ -0,0 +1,35 @@
+//! Reading and writing the files a command names by path.
+//!
+//! Every such read and write goes through [`read_file`] and [`write_file`], so the automation
+//! roots ([`crate::file_access`]) are checked in one place. A command module that called
+//! `std::fs` itself would bypass them; a test in `file_access` keeps that from happening.
+
+/// The bytes of the file at `path`, inside the automation read root when there is one.
+#[cfg(not(target_arch = "wasm32"))]
+pub fn read_file(path: &str) -> Result<Vec<u8>, String> {
+    crate::file_access::check_read(path)?;
+    std::fs::read(path).map_err(|e| format!("{path}: {e}"))
+}
+
+#[cfg(target_arch = "wasm32")]
+pub fn read_file(path: &str) -> Result<Vec<u8>, String> {
+    Err(format!("{path}: files are opened through the browser on the web"))
+}
+
+/// Write `bytes` to the file at `path`, inside the automation write root when there is one.
+///
+/// The bytes go to a temporary sibling first and are renamed over `path`, so a failed save never
+/// truncates the old file. The sibling is in the same folder, so it is inside the root whenever
+/// `path` is.
+#[cfg(not(target_arch = "wasm32"))]
+pub fn write_file(path: &str, bytes: &[u8]) -> Result<(), String> {
+    crate::file_access::check_write(path)?;
+    let tmp = format!("{path}.saving");
+    std::fs::write(&tmp, bytes).map_err(|e| format!("{path}: {e}"))?;
+    std::fs::rename(&tmp, path).map_err(|e| format!("{path}: {e}"))
+}
+
+#[cfg(target_arch = "wasm32")]
+pub fn write_file(path: &str, _bytes: &[u8]) -> Result<(), String> {
+    Err(format!("{path}: saving to a path is not available in the browser"))
+}
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index a2d2d2ac..29e80522 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -9,7 +9,9 @@
 
 pub mod cmd;
 pub mod connect;
+pub mod file_access;
 pub mod guard;
+pub mod io;
 pub mod keys;
 pub mod links;
 pub mod recovery;

From a541dad33dcca732087e5813c11d3e424c77c47a Mon Sep 17 00:00:00 2001
From: Isaac Levine <isaacmlevine4@gmail.com>
Date: Sun, 11 Oct 2026 23:44:40 -0400
Subject: [PATCH 046/376] MCP: confine the headless session to the automation
 roots

---
 crates/mcp/src/headless.rs           |  36 +++--
 crates/mcp/tests/automation_roots.rs | 220 +++++++++++++++++++++++++++
 2 files changed, 247 insertions(+), 9 deletions(-)
 create mode 100644 crates/mcp/tests/automation_roots.rs

diff --git a/crates/mcp/src/headless.rs b/crates/mcp/src/headless.rs
index 512e7cc4..76f6a30b 100644
--- a/crates/mcp/src/headless.rs
+++ b/crates/mcp/src/headless.rs
@@ -1,6 +1,9 @@
 //! An in-process engine session that answers the engine-level control-channel methods itself.
 
 use deckcraft_engine::{Mods, PointerEvent, PointerKind, Session, ToolKind};
+use std::sync::Arc;
+
+use deckcraft_engine::file_access::{self, AutomationRoots};
 use serde_json::{Value, json};
 
 use crate::backend::Backend;
@@ -8,6 +11,7 @@ use crate::backend::Backend;
 /// Headless backend: a [`Session`] rendering slides on the CPU.
 pub struct Headless {
     pub session: Session,
+    roots: Option<Arc<AutomationRoots>>,
 }
 
 impl Default for Headless {
@@ -58,12 +62,19 @@ pub fn tool_kind(name: &str, preset: Option<&str>) -> Option<ToolKind> {
 
 impl Headless {
     pub fn new() -> Self {
-        Self { session: Session::new() }
+        Self { session: Session::new(), roots: None }
     }
 
     /// A session with a fresh presentation.
     pub fn with_document() -> Self {
-        Self { session: Session::with_new() }
+        Self { session: Session::with_new(), roots: None }
+    }
+
+    /// Confine every file the session's commands read and write to `roots`
+    /// (`deckcraft-cli mcp --automation-read-root … --automation-write-root …`).
+    pub fn with_automation_roots(mut self, roots: Option<Arc<AutomationRoots>>) -> Self {
+        self.roots = roots;
+        self
     }
 
     fn exec(&mut self, id: &str, params: &Value) -> Result<Value, String> {
@@ -108,7 +119,7 @@ impl Headless {
         );
         let png = img.to_png();
         if let Some(path) = s(p, "path") {
-            std::fs::write(path, &png).map_err(|e| format!("{path}: {e}"))?;
+            deckcraft_engine::io::write_file(path, &png)?;
             return Ok(json!({"path": path, "width": img.width, "height": img.height}));
         }
         Ok(json!({"png": deckcraft_engine::cmd::base64_encode(&png), "width": img.width, "height": img.height, "slide": i}))
@@ -117,6 +128,19 @@ impl Headless {
 
 impl Backend for Headless {
     fn call(&mut self, method: &str, params: Value) -> Result<Value, String> {
+        let roots = self.roots.clone();
+        file_access::confine(roots.as_ref(), || self.answer(method, params))
+    }
+    fn has_ui(&self) -> bool {
+        false
+    }
+    fn describe(&self) -> String {
+        "headless (in-process engine; no window)".into()
+    }
+}
+
+impl Headless {
+    fn answer(&mut self, method: &str, params: Value) -> Result<Value, String> {
         let p = &params;
         match method {
             "engine.execute" | "command" | "ui.menu.invoke" => {
@@ -150,10 +174,4 @@ impl Backend for Headless {
             other => Err(format!("unknown method `{other}`")),
         }
     }
-    fn has_ui(&self) -> bool {
-        false
-    }
-    fn describe(&self) -> String {
-        "headless (in-process engine; no window)".into()
-    }
 }
diff --git a/crates/mcp/tests/automation_roots.rs b/crates/mcp/tests/automation_roots.rs
new file mode 100644
index 00000000..f8595ff9
--- /dev/null
+++ b/crates/mcp/tests/automation_roots.rs
@@ -0,0 +1,220 @@
+//! `deckcraft-cli mcp --automation-read-root <dir> --automation-write-root <dir>`: through the MCP
+//! protocol, files open and load only from inside the read root and are saved and exported only
+//! inside the write root. Paths that leave a root (`..`, another folder, a sibling with the same
+//! prefix, a link) are refused, and nothing is written outside.
+// Integration tests: unwrapping and panicking on failure is fine here, unlike in shipped code (AGENTS.md).
+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
+use std::path::{Path, PathBuf};
+
+use deckcraft_engine::file_access::AutomationRoots;
+use deckcraft_mcp::{Headless, Server};
+use serde_json::{Value, json};
+
+/// A 1x1 PNG, so `insert_picture` has something real to read.
+const PNG: &[u8] = &[
+    0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
+    0x08, 0x06, 0x00, 0x00, 0x00, 0x1f, 0x15, 0xc4, 0x89, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x63, 0xf8, 0xcf, 0xc0, 0xf0,
+    0x1f, 0x00, 0x05, 0x00, 0x01, 0xff, 0x89, 0x99, 0x3d, 0x1d, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82,
+];
+
+/// A fresh folder holding `in` (the read root, with `a.txt` and `pic.png`), `out` (the write root),
+/// `outside` (with `secret.txt` and `pic.png`) and `in2`, and a server confined to `in` and `out`
+/// (either may be left out). The server starts with a new presentation.
+fn confined(tag: &str, read: bool, write: bool) -> (Server, PathBuf) {
+    let base = std::env::temp_dir().join(format!("dc-mcp-roots-{tag}-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&base);
+    for d in ["in", "out", "outside", "in2"] {
+        std::fs::create_dir_all(base.join(d)).unwrap();
+    }
+    std::fs::write(base.join("in/a.txt"), "Inside text").unwrap();
+    std::fs::write(base.join("in/pic.png"), PNG).unwrap();
+    std::fs::write(base.join("outside/secret.txt"), "TOP SECRET").unwrap();
+    std::fs::write(base.join("outside/pic.png"), PNG).unwrap();
+    std::fs::write(base.join("in2/c.txt"), "Sibling").unwrap();
+    let (in_dir, out_dir) = (base.join("in"), base.join("out"));
+    let roots = AutomationRoots::new(read.then_some(in_dir.as_path()), write.then_some(out_dir.as_path())).unwrap();
+    let mut server = Server::new(Box::new(Headless::with_document().with_automation_roots(roots)));
+    ok(&mut server, "new_presentation", json!({}));
+    (server, base)
+}
+
+fn s(p: &Path) -> String {
+    p.to_string_lossy().into_owned()
+}
+
+/// `tools/call` -> (isError, the first text block).
+fn call(server: &mut Server, name: &str, args: Value) -> (bool, String) {
+    let line = json!({"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": name, "arguments": args}}).to_string();
+    let reply: Value = serde_json::from_str(&server.handle_line(&line).unwrap()).unwrap();
+    let result = &reply["result"];
+    let text = result["content"].as_array().unwrap().iter().find_map(|c| c["text"].as_str()).unwrap_or_default().to_string();
+    (result["isError"] == true, text)
+}
+
+fn ok(server: &mut Server, name: &str, args: Value) -> String {
+    let (error, text) = call(server, name, args.clone());
+    assert!(!error, "{name} {args}: {text}");
+    text
+}
+
+fn refused(server: &mut Server, name: &str, args: Value, why: &str) {
+    let (error, text) = call(server, name, args.clone());
+    assert!(error && text.contains(why), "{name} {args} should be refused ({why}): {text}");
+}
+
+fn run(server: &mut Server, command: &str, params: Value) -> (bool, String) {
+    call(server, "run_command", json!({"command": command, "params": params}))
+}
+
+/// Everything the open presentation says, as one string.
+fn deck_text(server: &mut Server) -> String {
+    format!("{} {}", ok(server, "inspect_document", json!({})), ok(server, "inspect_slide", json!({})))
+}
+
+#[test]
+fn presentations_open_only_from_inside_the_read_root() {
+    let (mut server, base) = confined("open", true, true);
+    let sep = std::path::MAIN_SEPARATOR;
+    ok(&mut server, "open_presentation", json!({"path": s(&base.join("in/a.txt"))}));
+    assert!(deck_text(&mut server).contains("Inside text"));
+
+    refused(&mut server, "open_presentation", json!({"path": s(&base.join("outside/secret.txt"))}), "outside the read root");
+    refused(
+        &mut server,
+        "open_presentation",
+        json!({"path": format!("{}{sep}..{sep}outside{sep}secret.txt", s(&base.join("in")))}),
+        "outside the read root",
+    );
+    refused(&mut server, "open_presentation", json!({"path": s(&base.join("in2/c.txt"))}), "outside the read root");
+    // The write root isn't readable: the two kinds of access are separate.
+    std::fs::write(base.join("out/d.txt"), "d").unwrap();
+    refused(&mut server, "open_presentation", json!({"path": s(&base.join("out/d.txt"))}), "outside the read root");
+    // The same through the engine command and the control-channel method.
+    let (error, text) = run(&mut server, "file.open", json!({"path": s(&base.join("outside/secret.txt"))}));
+    assert!(error && text.contains("outside the read root"), "{text}");
+    refused(&mut server, "call_app", json!({"method": "app.open", "params": {"path": s(&base.join("outside/secret.txt"))}}), "outside the read root");
+    // Nothing from the refused files reached the deck.
+    let text = deck_text(&mut server);
+    assert!(!text.contains("TOP SECRET") && !text.contains("Sibling"), "{text}");
+    assert!(text.contains("Inside text"), "the refused opens left the deck it had: {text}");
+    let _ = std::fs::remove_dir_all(base);
+}
+
+#[test]
+fn pictures_media_and_other_path_reads_are_confined() {
+    let (mut server, base) = confined("media", true, true);
+    ok(&mut server, "insert_picture", json!({"path": s(&base.join("in/pic.png"))}));
+    let before = ok(&mut server, "inspect_slide", json!({}));
+    refused(&mut server, "insert_picture", json!({"path": s(&base.join("outside/pic.png"))}), "outside the read root");
+    for command in ["insert.audio", "insert.video", "insert.picture", "picture.change"] {
+        let (error, text) = run(&mut server, command, json!({"path": s(&base.join("outside/pic.png"))}));
+        assert!(error && text.contains("outside the read root"), "{command}: {text}");
+    }
+    assert_eq!(ok(&mut server, "inspect_slide", json!({})), before, "refused reads change nothing");
+
+    // Media inside the root gets as far as being read: a refusal there would name the root.
+    for command in ["insert.audio", "insert.video"] {
+        let (_, text) = run(&mut server, command, json!({"path": s(&base.join("in/pic.png"))}));
+        assert!(!text.contains("automation"), "{command}: {text}");
+    }
+    let _ = std::fs::remove_dir_all(base);
+}
+
+#[test]
+fn every_writing_command_is_refused_outside_the_write_root() {
+    let (mut server, base) = confined("write", true, true);
+    let outside = |name: &str| s(&base.join("outside").join(name));
+    let inside = |name: &str| s(&base.join("out").join(name));
+    ok(&mut server, "add_slide", json!({"title": "Second"}));
+
+    refused(&mut server, "save_presentation", json!({"path": outside("x.deckcraft")}), "outside the write root");
+    refused(&mut server, "export", json!({"path": outside("x.pptx")}), "outside the write root");
+    refused(&mut server, "export", json!({"path": outside("x.pdf")}), "outside the write root");
+    refused(&mut server, "export", json!({"path": outside("x.png")}), "outside the write root");
+    refused(&mut server, "export", json!({"path": outside("x.txt")}), "outside the write root");
+    refused(&mut server, "export", json!({"path": outside("all.png"), "all": true}), "outside the write root");
+    refused(&mut server, "render_slide", json!({"path": outside("r.png")}), "outside the write root");
+    refused(&mut server, "call_app", json!({"method": "app.save", "params": {"path": outside("y.deckcraft")}}), "outside the write root");
+    refused(&mut server, "call_app", json!({"method": "app.export", "params": {"path": outside("y.pdf")}}), "outside the write root");
+    for command in ["file.save", "file.saveAs", "file.export"] {
+        let (error, text) = run(&mut server, command, json!({"path": outside("z.deckcraft")}));
+        assert!(error && text.contains("outside the write root"), "{command}: {text}");
+    }
+    // A sibling folder with the same prefix, and `..` out of the root.
+    refused(&mut server, "save_presentation", json!({"path": s(&base.join("out2/x.deckcraft"))}), "outside the write root");
+    let sep = std::path::MAIN_SEPARATOR;
+    refused(
+        &mut server,
+        "save_presentation",
+        json!({"path": format!("{}{sep}..{sep}outside{sep}x.deckcraft", s(&base.join("out")))}),
+        "outside the write root",
+    );
+    // The read root isn't writable.
+    refused(&mut server, "save_presentation", json!({"path": s(&base.join("in/x.deckcraft"))}), "outside the write root");
+
+    let leftovers: Vec<_> = std::fs::read_dir(base.join("outside")).unwrap().map(|e| e.unwrap().file_name()).collect();
+    assert_eq!(leftovers.len(), 2, "nothing was written beside secret.txt and pic.png: {leftovers:?}");
+    assert!(!base.join("out2").exists() && !base.join("in/x.deckcraft").exists());
+
+    // Inside the write root all of it works.
+    ok(&mut server, "save_presentation", json!({"path": inside("x.deckcraft")}));
+    ok(&mut server, "export", json!({"path": inside("x.pptx")}));
+    ok(&mut server, "export", json!({"path": inside("x.pdf")}));
+    ok(&mut server, "export", json!({"path": inside("all.png"), "all": true}));
+    ok(&mut server, "render_slide", json!({"path": inside("r.png")}));
+    for f in ["x.deckcraft", "x.pptx", "x.pdf", "all1.png", "all2.png", "r.png"] {
+        assert!(base.join("out").join(f).exists(), "{f}");
+    }
+    assert!(!base.join("out/x.deckcraft.saving").exists(), "the temporary file is renamed away");
+    let _ = std::fs::remove_dir_all(base);
+}
+
+#[test]
+fn one_root_grants_only_its_own_access() {
+    let (mut read_only, base) = confined("read-only", true, false);
+    ok(&mut read_only, "open_presentation", json!({"path": s(&base.join("in/a.txt"))}));
+    refused(&mut read_only, "save_presentation", json!({"path": s(&base.join("out/x.deckcraft"))}), "write authority is absent");
+    refused(&mut read_only, "export", json!({"path": s(&base.join("out/x.pdf"))}), "write authority is absent");
+    refused(&mut read_only, "render_slide", json!({"path": s(&base.join("out/r.png"))}), "write authority is absent");
+    // Calls that return bytes instead of writing a path keep working.
+    let (error, _) = call(&mut read_only, "render_slide", json!({"scale": 0.25}));
+    assert!(!error);
+    assert!(std::fs::read_dir(base.join("out")).unwrap().next().is_none());
+    let _ = std::fs::remove_dir_all(base);
+
+    let (mut write_only, base) = confined("write-only", false, true);
+    refused(&mut write_only, "open_presentation", json!({"path": s(&base.join("in/a.txt"))}), "read authority is absent");
+    refused(&mut write_only, "insert_picture", json!({"path": s(&base.join("in/pic.png"))}), "read authority is absent");
+    ok(&mut write_only, "save_presentation", json!({"path": s(&base.join("out/x.deckcraft"))}));
+    assert!(base.join("out/x.deckcraft").exists());
+    let _ = std::fs::remove_dir_all(base);
+}
+
+#[cfg(unix)]
+#[test]
+fn links_out_of_a_root_are_refused() {
+    let (mut server, base) = confined("links", true, true);
+    std::os::unix::fs::symlink(base.join("outside/secret.txt"), base.join("in/leak.txt")).unwrap();
+    std::os::unix::fs::symlink(base.join("outside"), base.join("out/away")).unwrap();
+    std::os::unix::fs::symlink(base.join("outside/gone.deckcraft"), base.join("out/dangling.deckcraft")).unwrap();
+    refused(&mut server, "open_presentation", json!({"path": s(&base.join("in/leak.txt"))}), "outside the read root");
+    refused(&mut server, "save_presentation", json!({"path": s(&base.join("out/away/x.deckcraft"))}), "outside the write root");
+    refused(&mut server, "save_presentation", json!({"path": s(&base.join("out/dangling.deckcraft"))}), "a link that leads nowhere");
+    assert!(!base.join("outside/x.deckcraft").exists() && !base.join("outside/gone.deckcraft").exists());
+    assert!(!deck_text(&mut server).contains("TOP SECRET"));
+    let _ = std::fs::remove_dir_all(base);
+}
+
+#[test]
+fn without_roots_nothing_is_confined() {
+    let base = std::env::temp_dir().join(format!("dc-mcp-roots-none-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&base);
+    std::fs::create_dir_all(&base).unwrap();
+    std::fs::write(base.join("a.txt"), "Anywhere").unwrap();
+    let mut server = Server::new(Box::new(Headless::with_document().with_automation_roots(AutomationRoots::new(None, None).unwrap())));
+    ok(&mut server, "open_presentation", json!({"path": s(&base.join("a.txt"))}));
+    ok(&mut server, "save_presentation", json!({"path": s(&base.join("b.deckcraft"))}));
+    assert!(base.join("b.deckcraft").exists());
+    let _ = std::fs::remove_dir_all(base);
+}

From f3ae32d920962e9b59c54016eb2bdd005d614356 Mon Sep 17 00:00:00 2001
From: Isaac Levine <isaacmlevine4@gmail.com>
Date: Sun, 11 Oct 2026 23:44:40 -0400
Subject: [PATCH 047/376] CLI: add --automation-read-root and
 --automation-write-root to mcp

---
 apps/deckcraft-cli/src/automation_args.rs |  90 +++++++++++++++++
 apps/deckcraft-cli/src/main.rs            |  34 ++++++-
 apps/deckcraft-cli/tests/cli.rs           | 118 ++++++++++++++++++++++
 3 files changed, 238 insertions(+), 4 deletions(-)
 create mode 100644 apps/deckcraft-cli/src/automation_args.rs
 create mode 100644 apps/deckcraft-cli/tests/cli.rs

diff --git a/apps/deckcraft-cli/src/automation_args.rs b/apps/deckcraft-cli/src/automation_args.rs
new file mode 100644
index 00000000..8f0cabf8
--- /dev/null
+++ b/apps/deckcraft-cli/src/automation_args.rs
@@ -0,0 +1,90 @@
+//! Parse `--automation-read-root` / `--automation-write-root` before the server starts. A malformed
+//! flag must not silently remove a root and leave the server unconfined.
+
+use std::path::PathBuf;
+
+pub struct AutomationArgs {
+    pub read_root: Option<PathBuf>,
+    pub write_root: Option<PathBuf>,
+    read_given: bool,
+    write_given: bool,
+}
+
+impl AutomationArgs {
+    pub fn new(read_root: Option<PathBuf>, write_root: Option<PathBuf>) -> Self {
+        Self { read_root, write_root, read_given: false, write_given: false }
+    }
+
+    /// Returns whether this argument is a root flag. A second occurrence of a flag is an error,
+    /// including when the two spellings (`--flag DIR`, `--flag=DIR`) are mixed.
+    pub fn consume(&mut self, arg: &str, args: &mut impl Iterator<Item = String>) -> Result<bool, String> {
+        let (flag, inline) = arg.split_once('=').map_or((arg, None), |(flag, value)| (flag, Some(value)));
+        let (root, given) = match flag {
+            "--automation-read-root" => (&mut self.read_root, &mut self.read_given),
+            "--automation-write-root" => (&mut self.write_root, &mut self.write_given),
+            _ => return Ok(false),
+        };
+        if *given {
+            return Err(format!("{flag} given twice"));
+        }
+        let value = match inline {
+            Some(value) => value.to_owned(),
+            None => {
+                let value = args.next().ok_or_else(|| format!("{flag} needs a folder"))?;
+                if value.starts_with('-') {
+                    return Err(format!("{flag} needs a folder; use {flag}=<dir> for a folder starting with '-'"));
+                }
+                value
+            }
+        };
+        if value.is_empty() {
+            return Err(format!("{flag} needs a non-empty folder"));
+        }
+        *root = Some(value.into());
+        *given = true;
+        Ok(true)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn roots_are_taken_once_and_other_arguments_are_left() {
+        let mut roots = AutomationArgs::new(None, None);
+        let mut args = ["a folder".to_owned(), "deck.pptx".to_owned()].into_iter();
+        assert!(roots.consume("--automation-read-root", &mut args).unwrap());
+        assert!(roots.consume("--automation-write-root=out", &mut args).unwrap());
+        assert!(!roots.consume("--sample", &mut args).unwrap());
+        assert_eq!(roots.read_root, Some("a folder".into()));
+        assert_eq!(roots.write_root, Some("out".into()));
+        assert_eq!(args.next().as_deref(), Some("deck.pptx"));
+        assert!(roots.consume("--automation-read-root=other", &mut args).is_err());
+        assert_eq!(roots.read_root, Some("a folder".into()));
+    }
+
+    #[test]
+    fn invalid_operands_leave_roots_unchanged() {
+        for flag in ["--automation-read-root", "--automation-write-root"] {
+            for operand in [None, Some(""), Some("--version"), Some("--connect"), Some("-folder")] {
+                let mut roots = AutomationArgs::new(Some("read".into()), Some("write".into()));
+                let mut args = operand.map(str::to_owned).into_iter();
+                assert!(roots.consume(flag, &mut args).is_err(), "{flag} {operand:?}");
+                assert_eq!(roots.read_root, Some("read".into()));
+                assert_eq!(roots.write_root, Some("write".into()));
+            }
+            let mut roots = AutomationArgs::new(None, None);
+            assert!(roots.consume(&format!("{flag}="), &mut std::iter::empty()).is_err());
+        }
+    }
+
+    #[test]
+    fn explicit_dash_folder_and_relative_dash_folder_are_valid() {
+        let mut roots = AutomationArgs::new(None, None);
+        assert!(roots.consume("--automation-read-root=-folder", &mut std::iter::empty()).unwrap());
+        assert!(roots.consume("--automation-write-root", &mut ["./-folder".to_owned()].into_iter()).unwrap());
+        assert_eq!(roots.read_root, Some("-folder".into()));
+        assert_eq!(roots.write_root, Some("./-folder".into()));
+    }
+}
diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index c450393f..137237e0 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -8,12 +8,15 @@
 //! deckcraft-cli commands [FILTER]               # list commands (JSON)
 //! deckcraft-cli describe ID                     # one command
 //! deckcraft-cli app [--port PORT] COMMAND [JSON] | --method METHOD [JSON]   # drive the running app
-//! deckcraft-cli mcp [--connect PORT] [--sample] # MCP server over stdio
+//! deckcraft-cli mcp [--connect PORT] [--sample] [--automation-read-root DIR] [--automation-write-root DIR]
+//!                                               # MCP server over stdio
 //! deckcraft-cli links | --version
 //! ```
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
 
+mod automation_args;
+
 use std::process::ExitCode;
 
 use deckcraft_engine::Session;
@@ -39,7 +42,11 @@ const USAGE: &str = "usage: deckcraft-cli info FILE
        deckcraft-cli commands [FILTER]
        deckcraft-cli describe COMMAND
        deckcraft-cli app [--port PORT] COMMAND [JSON] | --method METHOD [JSON]
-       deckcraft-cli mcp [--connect PORT] [--sample]
+       deckcraft-cli mcp [--connect PORT] [--sample] [--automation-read-root DIR] [--automation-write-root DIR]
+                         the two roots confine every file the agent's commands read (open, pictures,
+                         audio, video) and write (save, export, PDF) to those folders, links followed;
+                         a root left out grants none of its access. They run the in-process server, so
+                         they conflict with --connect (a running app is not confined by them).
        deckcraft-cli links | --version";
 
 fn main() -> ExitCode {
@@ -253,24 +260,43 @@ fn app(args: &[String]) -> Result<(), String> {
 }
 
 fn mcp(args: &[String]) -> Result<(), String> {
+    use deckcraft_engine::file_access::{self, AutomationRoots};
     use deckcraft_mcp::{Backend, Headless, Remote, Server, control_addr};
     let mut connect: Option<String> = None;
     let mut sample = false;
-    let mut it = args.iter();
+    let mut roots_args = automation_args::AutomationArgs::new(None, None);
+    let mut it = args.iter().cloned();
     while let Some(a) = it.next() {
+        if roots_args.consume(&a, &mut it)? {
+            continue;
+        }
         match a.as_str() {
-            "--connect" => connect = Some(it.next().cloned().ok_or("--connect needs a port or host:port")?),
+            "--connect" => connect = Some(it.next().ok_or("--connect needs a port or host:port")?),
             "--sample" => sample = true,
             other => return Err(format!("unknown mcp option `{other}`")),
         }
     }
+    let roots = AutomationRoots::new(roots_args.read_root.as_deref(), roots_args.write_root.as_deref())?;
+    if roots.is_some() && connect.is_some() {
+        return Err("--automation-read-root and --automation-write-root confine the in-process server; a running app is not confined by them, \
+so drop --connect (or use --connect without the roots)"
+            .into());
+    }
     let backend: Box<dyn Backend> = match connect {
         Some(c) => Box::new(Remote::connect(&control_addr(&c)).map_err(|e| format!("can't reach the app at {c}: {e}"))?),
         None => {
             let mut h = Headless::new();
+            // `--sample` is the operator's own choice, made before the roots come into force.
             if sample {
                 deckcraft_engine::sample::open_sample(&mut h.session).map_err(|e| e.to_string())?;
             }
+            if let Some(roots) = roots {
+                // Every thread of this process, not only the server's: nothing reaches past the roots.
+                file_access::confine_process(roots.clone());
+                let show = |root: Option<&std::path::Path>| root.map_or_else(|| "none".to_string(), |r| r.display().to_string());
+                eprintln!("deckcraft-cli: files confined: read root {}, write root {}", show(roots.read_root()), show(roots.write_root()));
+                h = h.with_automation_roots(Some(roots));
+            }
             Box::new(h)
         }
     };
diff --git a/apps/deckcraft-cli/tests/cli.rs b/apps/deckcraft-cli/tests/cli.rs
new file mode 100644
index 00000000..e9e1f856
--- /dev/null
+++ b/apps/deckcraft-cli/tests/cli.rs
@@ -0,0 +1,118 @@
+//! `deckcraft-cli mcp` with the automation root flags, run as the real binary.
+// Integration tests: unwrapping and panicking on failure is fine here, unlike in shipped code (AGENTS.md).
+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
+use std::io::Write;
+use std::path::PathBuf;
+use std::process::{Command, Output, Stdio};
+
+use serde_json::Value;
+
+fn bin() -> Command {
+    Command::new(env!("CARGO_BIN_EXE_deckcraft-cli"))
+}
+
+fn run(args: &[&str]) -> Output {
+    bin().args(args).output().unwrap()
+}
+
+fn tmpdir(tag: &str) -> PathBuf {
+    let dir = std::env::temp_dir().join(format!("dc-cli-{tag}-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    std::fs::create_dir_all(&dir).unwrap();
+    dir
+}
+
+/// Send `calls` (tool name, arguments) to `deckcraft-cli mcp <args>`; returns whether it exited
+/// cleanly, its stderr, and the stdout lines after `initialize`, one per call.
+fn mcp_session(args: &[&str], calls: &[(&str, Value)]) -> (bool, String, Vec<Value>) {
+    let mut child = bin().arg("mcp").args(args).stdin(Stdio::piped()).stdout(Stdio::piped()).stderr(Stdio::piped()).spawn().unwrap();
+    {
+        let stdin = child.stdin.as_mut().unwrap();
+        writeln!(stdin, r#"{{"jsonrpc":"2.0","id":1,"method":"initialize","params":{{"protocolVersion":"2025-06-18"}}}}"#).unwrap();
+        for (i, (name, arguments)) in calls.iter().enumerate() {
+            let call = serde_json::json!({"jsonrpc": "2.0", "id": i + 2, "method": "tools/call", "params": {"name": name, "arguments": arguments}});
+            writeln!(stdin, "{call}").unwrap();
+        }
+    }
+    let out = child.wait_with_output().unwrap();
+    let stdout = String::from_utf8(out.stdout).unwrap();
+    let replies = stdout.lines().skip(1).map(|l| serde_json::from_str(l).unwrap()).collect();
+    (out.status.success(), String::from_utf8_lossy(&out.stderr).into_owned(), replies)
+}
+
+fn text(reply: &Value) -> &str {
+    reply["result"]["content"][0]["text"].as_str().unwrap()
+}
+
+#[test]
+fn mcp_automation_roots_confine_the_server() {
+    let base = tmpdir("roots");
+    let (work, elsewhere) = (base.join("work"), base.join("elsewhere"));
+    std::fs::create_dir_all(&work).unwrap();
+    std::fs::create_dir_all(&elsewhere).unwrap();
+    std::fs::write(work.join("in.txt"), "Inside text").unwrap();
+    std::fs::write(elsewhere.join("secret.txt"), "TOP SECRET").unwrap();
+    let work_s = work.to_str().unwrap();
+    let secret = elsewhere.join("secret.txt").to_str().unwrap().to_string();
+
+    // Both spellings of the flags; inside works, outside is refused with a readable message.
+    let read_flag = format!("--automation-read-root={work_s}");
+    let calls = [
+        ("open_presentation", serde_json::json!({"path": work.join("in.txt").to_str().unwrap()})),
+        ("open_presentation", serde_json::json!({"path": secret})),
+        ("save_presentation", serde_json::json!({"path": work.join("saved.deckcraft").to_str().unwrap()})),
+        ("save_presentation", serde_json::json!({"path": elsewhere.join("saved.deckcraft").to_str().unwrap()})),
+    ];
+    let (success, stderr, replies) = mcp_session(&[&read_flag, "--automation-write-root", work_s], &calls);
+    assert!(success, "{stderr}");
+    assert!(stderr.contains("files confined"), "{stderr}");
+    assert_eq!(replies[0]["result"]["isError"], false, "{}", replies[0]);
+    assert_eq!(replies[1]["result"]["isError"], true);
+    assert!(text(&replies[1]).contains("outside the read root"), "{}", text(&replies[1]));
+    assert_eq!(replies[2]["result"]["isError"], false, "{}", replies[2]);
+    assert!(work.join("saved.deckcraft").exists());
+    assert_eq!(replies[3]["result"]["isError"], true);
+    assert!(text(&replies[3]).contains("outside the write root"), "{}", text(&replies[3]));
+    assert!(!elsewhere.join("saved.deckcraft").exists());
+
+    // A root left out grants none of its access.
+    let save = [("new_presentation", serde_json::json!({})), calls[2].clone()];
+    let (_, _, replies) = mcp_session(&[&read_flag], &save);
+    assert_eq!(replies[1]["result"]["isError"], true);
+    assert!(text(&replies[1]).contains("write authority is absent"), "{}", text(&replies[1]));
+
+    // No flags: nothing is confined.
+    let (success, _, replies) = mcp_session(&[], &calls[1..2]);
+    assert!(success);
+    assert_eq!(replies[0]["result"]["isError"], false, "{}", replies[0]);
+    let _ = std::fs::remove_dir_all(base);
+}
+
+#[test]
+fn mcp_automation_root_flags_are_checked_up_front() {
+    let base = tmpdir("roots-args");
+    let dir = base.to_str().unwrap();
+    let missing = base.join("missing");
+    let fails = |args: &[&str], needle: &str| {
+        let mut full = vec!["mcp"];
+        full.extend_from_slice(args);
+        let o = run(&full);
+        assert!(!o.status.success(), "{args:?}");
+        let err = String::from_utf8_lossy(&o.stderr).into_owned();
+        assert!(err.contains(needle), "{args:?}: {err}");
+    };
+    // The flags confine the in-process server, so they cannot be combined with --connect.
+    fails(&["--connect", "7979", "--automation-read-root", dir], "--connect");
+    fails(&["--automation-write-root", dir, "--connect", "7979"], "--connect");
+    fails(&["--automation-read-root", dir, "--automation-read-root", dir], "given twice");
+    fails(&["--automation-write-root", dir, "--automation-write-root", dir], "given twice");
+    fails(&["--automation-read-root"], "needs a folder");
+    fails(&["--automation-write-root", "--sample"], "needs a folder");
+    fails(&["--automation-read-root", missing.to_str().unwrap()], "cannot open the automation read root");
+    fails(&["--automation-write-root="], "needs a non-empty folder");
+    // A file is not a folder.
+    std::fs::write(base.join("f.txt"), "x").unwrap();
+    fails(&["--automation-write-root", base.join("f.txt").to_str().unwrap()], "cannot open the automation write root");
+    let _ = std::fs::remove_dir_all(base);
+}

From 31f5446641d2464b3f0c7cbd076193880fb4a780 Mon Sep 17 00:00:00 2001
From: Isaac Levine <isaacmlevine4@gmail.com>
Date: Sun, 11 Oct 2026 23:44:40 -0400
Subject: [PATCH 048/376] Docs: document --automation-read-root and
 --automation-write-root for mcp

---
 README.md   |  1 +
 docs/mcp.md | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/README.md b/README.md
index f25aef2d..13c48706 100644
--- a/README.md
+++ b/README.md
@@ -150,6 +150,7 @@ deckcraft-cli commands format.          # list commands
 deckcraft-cli run --sample --cmd 'slide.new={"layout":"titleOnly","title":"Hello"}' --save hello.deckcraft
 deckcraft-cli mcp                       # MCP server over stdio (headless)
 deckcraft-cli mcp --connect 7990        # drive the running app (deckcraft --control 7990)
+deckcraft-cli mcp --automation-read-root DIR --automation-write-root DIR   # confine the headless agent to folders
 ```
 
 ## Roadmap
diff --git a/docs/mcp.md b/docs/mcp.md
index f7e24c7e..c5e5a191 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -13,6 +13,58 @@ deck.
 }
 ```
 
+## Confining file access
+
+```sh
+deckcraft-cli mcp --automation-read-root /work/project --automation-write-root /work/project/out
+```
+
+```json
+{"mcpServers": {"deckcraft": {"command": "deckcraft-cli",
+  "args": ["mcp", "--automation-read-root", "/work/project", "--automation-write-root", "/work/project/out"]}}}
+```
+
+The two flags (VectorCraft, PhotoCraft and the other Craft apps take the same ones, so one client
+config works across the suite) keep the agent to the folders you give it:
+
+- Every file a command reads must lie inside the **read root**: `open_presentation` and
+  `file.open`, and `insert_picture`, `insert.picture`, `picture.change`, `insert.audio` and
+  `insert.video` with a `path`. Pictures, audio and video are copied into the deck when they are
+  inserted, so playing them later reads nothing from disk.
+- Every file a command writes must lie inside the **write root**: `save_presentation`, `export`
+  (every format, and every slide of an image export), `file.save`, `file.saveAs`, `file.export`,
+  and `render_slide` with a `path`, plus the `.saving` temporary file a save goes through.
+- Read and write access are separate. Give the same folder twice for both; a root left out grants
+  none of its access (with only `--automation-read-root`, nothing can be written to disk). Without
+  either flag nothing changes.
+- A path is made absolute against the server's working directory, then its links are followed: a
+  file (or folder) link that leads out of a root is outside it. For a file that doesn't exist yet,
+  its nearest existing folder's links are followed and the rest must be plain names, so `..` below a
+  folder that doesn't exist is refused, as is a link that leads nowhere (writing through it would
+  create its target). The result is compared with the root by whole folder names: `/work2/x` is not
+  inside `/work`. On Windows case is ignored, UNC paths (`\\server\share\...`) are resolved like
+  drive-letter ones, and device names (`CON`, `NUL`, `COM1`...) are refused.
+- A refused path is an ordinary tool error the agent can read and correct, for example
+  `automation path rejected: outside the write root /work/project/out: /etc/x.pptx` or
+  `automation filesystem access is not granted: write authority is absent: /work/project/out/x.pptx`.
+- The roots must be existing folders; a missing one stops the server with an error. Each flag is
+  given once (`--flag <dir>` or `--flag=<dir>`).
+
+The flags confine the in-process server, so `--connect` together with them is an error: the server
+would otherwise talk to an app that isn't confined. DeckCraft's desktop app has no equivalent flags
+yet, so a running app (`deckcraft --control`) is not confined. `--sample` is the operator's own
+choice and is opened before the roots apply.
+
+What the roots do not cover: commands that take no path still read and change the open deck, and
+`inspect_document` and `inspect_slide` return it. The system font scan and the app's own recovery
+folder are fixed paths, not agent input, and are not checked. Anything that reads or writes a path
+goes through one place in the engine (`io::read_file` and `io::write_file`); a test keeps the rest of the
+engine from touching the file system on its own.
+
+The checks hold for every thread of the server process. A path is checked, then opened: another
+program that swaps a link in between can still win that race, so the roots keep an agent to the
+files it was given rather than guarding against other software on the computer.
+
 ## Tools
 
 | Tool | What it does |

From fa2de347c4c4457f19c19ee8e5fcbc05634f084a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B0=D0=B3=D0=B4=D0=B0=20=D0=9C=2E=D0=93=2E?=
 <mail@mgmagda.ru>
Date: Mon, 12 Oct 2026 16:57:59 +0300
Subject: [PATCH 049/376] Text: exact line spacing ends at the last line's
 descent

With exact line spacing (a:lnSpc/a:spcPts) PowerPoint puts the baseline at
80 % of the line pitch and ends the text at the last line's descent, not a
full pitch below it. We drew every line a full pitch tall, so table rows
whose cells use exact spacing grew taller than PowerPoint's (35.6 pt
instead of 33 pt for 12 pt type at 26.59 pt), pushing tables and text
boxes down and tripping shrink-on-overflow early.

Measured on PowerPoint's own PDF of a real deck: rows now come out at
33.5 pt against PowerPoint's 32.9-33.8 pt.
---
 crates/text/src/lib.rs   | 11 +++++++++--
 crates/text/src/tests.rs | 27 +++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index 225f4afb..349a4016 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -879,6 +879,8 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
     let mut numbering: Vec<u32> = vec![0; 9];
     let mut all_lines: Vec<(LineInfo, LinePlace, f64, Option<(String, f64, f64)>)> = vec![];
     let mut prev_after = 0.0;
+    // How far the last line's full pitch reaches past the text (exact spacing; see below).
+    let mut tail = 0.0;
     let mut shaped_paras: Vec<ParaShaped> = Vec::with_capacity(body.paragraphs.len());
     for (pi, para) in body.paragraphs.iter().enumerate() {
         let lvl = para.level.min(8) as usize;
@@ -947,7 +949,11 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
             };
             let ratio = if natural > 0.0 { lh / natural } else { 1.0 };
             let top = y;
-            let baseline = top + asc * ratio;
+            // Exact spacing (`spcPts`), as PowerPoint sets it: the baseline sits at 80 % of the
+            // line pitch, and the text ends at the last line's descent rather than a full pitch.
+            let exact = matches!(props.line_spacing, Some(Spacing::Pts(_)));
+            let baseline = if exact { top + lh * 0.8 } else { top + asc * ratio };
+            tail = if exact { (lh * 0.2 - desc).max(-lh) } else { 0.0 };
             y += lh;
             let x0 = if li == 0 { first_x } else { rest_x };
             let avail = (col_w - x0 - mr).max(0.0);
@@ -1084,7 +1090,8 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
         out.para_lines.push((first_line_idx, raw.len()));
         prev_after = spacing_pts(props.space_after, p.lead_size, reduce).max(0.0);
     }
-    let total = y;
+    // The text ends at the last line's descent under exact spacing.
+    let total = (y - tail).max(0.0);
     out.content_height = total;
     // Columns: distribute lines by height.
     let col_h = if ncols > 1 { inner.height() } else { f64::INFINITY };
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index f3d5db5d..c524b43e 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -54,6 +54,33 @@ fn shrink_on_overflow() {
     assert!(!l.overflow || l.font_scale <= 0.11);
 }
 
+#[test]
+fn exact_line_spacing_ends_at_the_last_descent() {
+    // 12 pt text at exactly 26.59 pt per line (a table cell PowerPoint sizes to 24.3 pt of text):
+    // the baseline at 80 % of the pitch, the text ending at the last line's descent.
+    let (p, mut sh) = setup("One\nTwo", 600.0, 300.0);
+    for para in &mut sh.text.as_mut().unwrap().paragraphs {
+        para.props.line_spacing = Some(Spacing::Pts(26.59));
+        para.props.bullet = Some(Bullet::None);
+        for r in &mut para.runs {
+            r.props.size = Some(12.0);
+        }
+    }
+    let l = lay(&p, &sh, 600.0, 300.0);
+    let first = &l.lines[0];
+    assert!((first.baseline - first.top - 26.59 * 0.8).abs() < 0.01, "{:?}", first.baseline - first.top);
+    // The text ends at the last line's descent: above its full pitch by 20 % of it less the
+    // descent (~2.3 pt for 12 pt type).
+    let short = (l.lines[1].bottom - l.lines[0].top) - l.content_height;
+    assert!(short > 1.0 && short < 26.59 * 0.2, "{short}");
+    // Proportional spacing keeps full pitches.
+    for para in &mut sh.text.as_mut().unwrap().paragraphs {
+        para.props.line_spacing = Some(Spacing::Pct(1.0));
+    }
+    let l = lay(&p, &sh, 600.0, 300.0);
+    assert!((l.content_height - (l.lines[1].bottom - l.lines[0].top)).abs() < 0.01);
+}
+
 #[test]
 fn caret_and_hit_roundtrip() {
     let (p, sh) = setup("Hello world", 600.0, 100.0);

From 1eb7ec83aec7d34958e06a4e4a71ce27b0d3671d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B0=D0=B3=D0=B4=D0=B0=20=D0=9C=2E=D0=93=2E?=
 <mail@mgmagda.ru>
Date: Mon, 12 Oct 2026 17:21:51 +0300
Subject: [PATCH 050/376] Text: draw a saved shrink scale as it is

PowerPoint fits shrink-on-overflow text again only when the text changes,
never when a file opens: it draws the saved fontScale/lnSpcReduction even
where our metrics would call the text overflowing (trailing empty
paragraphs at full size, substituted fonts). Shrinking further on open made
saved decks text smaller than PowerPoints (74 % instead of 85 % on a real
deck). With no saved scale, or once an edit has reset it, the text is
fitted as before.
---
 crates/text/src/lib.rs   | 5 +++++
 crates/text/src/tests.rs | 8 ++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index 684ed4a8..288c69fe 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -835,8 +835,13 @@ pub fn layout(ctx: &Ctx, shape: &Shape, body: &TextBody, opts: &Opts) -> TextLay
         _ => (1.0, 0.0),
     };
     let mut l = layout_scaled(ctx, shape, body, &bp, opts, scale0, reduce0);
+    // A scale PowerPoint saved is drawn as it is: PowerPoint fits the text again only when it
+    // changes (and editing resets the saved scale), not when a file opens, even where our
+    // metrics would call it overflowing (trailing empty paragraphs, substituted fonts).
+    let saved = scale0 < 1.0 || reduce0 > 0.0;
     if let (AutoFit::Shrink { .. }, false) = (autofit, opts.no_shrink)
         && l.overflow
+        && !saved
     {
         // Binary search the largest scale that fits (steps like 90%, 80%… with line reduction).
         let (mut lo, mut hi) = (0.1_f64, scale0);
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index fcba4645..6049ee1c 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -62,12 +62,16 @@ fn saved_shrink_scale_is_drawn() {
     sh.text.as_mut().unwrap().body.autofit = Some(AutoFit::Shrink { font_scale: 0.625, line_reduction: 0.2 });
     let l = lay(&p, &sh, 600.0, 300.0);
     assert_eq!((l.font_scale, l.line_reduction), (0.625, 0.2));
-    // Text that doesn't fit even at the saved scale shrinks further.
+    // Text our metrics find overflowing at the saved scale is still drawn at it, as PowerPoint
+    // draws it until the text changes; with no saved scale it shrinks to fit.
     let text = (0..30).map(|i| format!("Line number {i}")).collect::<Vec<_>>().join("\n");
     let (p, mut sh) = setup(&text, 600.0, 200.0);
     sh.text.as_mut().unwrap().body.autofit = Some(AutoFit::Shrink { font_scale: 0.9, line_reduction: 0.1 });
     let l = lay(&p, &sh, 600.0, 200.0);
-    assert!(l.font_scale < 0.9 && l.line_reduction >= 0.1, "{} {}", l.font_scale, l.line_reduction);
+    assert_eq!((l.font_scale, l.line_reduction), (0.9, 0.1));
+    sh.text.as_mut().unwrap().body.autofit = Some(AutoFit::Shrink { font_scale: 1.0, line_reduction: 0.0 });
+    let l = lay(&p, &sh, 600.0, 200.0);
+    assert!(l.font_scale < 0.9, "{}", l.font_scale);
     // Nonsense saved values are ignored.
     let (p, mut sh) = setup("Short", 600.0, 300.0);
     sh.text.as_mut().unwrap().body.autofit = Some(AutoFit::Shrink { font_scale: f64::NAN, line_reduction: 5.0 });

From 2a8c5b2b270225bac1f1c9fed2bf7e5e2705408c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B0=D0=B3=D0=B4=D0=B0=20=D0=9C=2E=D0=93=2E?=
 <mail@mgmagda.ru>
Date: Mon, 12 Oct 2026 17:02:05 +0300
Subject: [PATCH 051/376] Text: line spacing reduction comes off the
 percentage, not the spacing

PowerPoint's lnSpcReduction takes percentage points off a paragraph's line
spacing (90 % less 20 % is 70 %) and leaves the space before and after
paragraphs alone. We multiplied (90 % x 0.8 = 72 %) and shrank the
paragraph spacing too, so shrunk text came out with different line and
paragraph pitches than PowerPoint's: measured on PowerPoint's PDF of a real
deck, a body at 90 % spacing, 10 pt before paragraphs and a 20 % reduction
runs at 20.2 pt lines with 9.9 pt between paragraphs.
---
 crates/text/src/lib.rs   | 16 ++++++++++------
 crates/text/src/tests.rs | 31 +++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index 225f4afb..13f9d4b4 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -320,10 +320,12 @@ fn face_chain(ctx: &Ctx, st: &Style, slot: FontSlot, script: Option<ScriptTag>)
     chain
 }
 
-fn spacing_pts(s: Option<Spacing>, size: f64, reduce: f64) -> f64 {
+/// Space before or after a paragraph, points. Shrink-on-overflow's line spacing reduction
+/// doesn't apply to it (PowerPoint keeps it).
+fn spacing_pts(s: Option<Spacing>, size: f64) -> f64 {
     match s {
-        Some(Spacing::Pct(p)) => p * size * 1.2 * (1.0 - reduce),
-        Some(Spacing::Pts(v)) => v * (1.0 - reduce),
+        Some(Spacing::Pct(p)) => p * size * 1.2,
+        Some(Spacing::Pts(v)) => v,
         None => 0.0,
     }
 }
@@ -918,7 +920,7 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
         let first_w = (col_w - first_x - mr).max(1.0);
         let rest_w = (col_w - rest_x - mr).max(1.0);
         let raw = break_lines(p, first_w, rest_w, wrap, &tabs, props.default_tab.unwrap_or(72.0), first_x, rest_x);
-        let before = if pi == 0 { 0.0 } else { spacing_pts(props.space_before, p.lead_size, reduce) };
+        let before = if pi == 0 { 0.0 } else { spacing_pts(props.space_before, p.lead_size) };
         y += before.max(0.0) + prev_after;
         let first_line_idx = all_lines.len();
         for (li, rl) in raw.iter().enumerate() {
@@ -941,7 +943,9 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
             }
             let natural = (asc + desc).max(size * 1.0);
             let lh = match props.line_spacing {
-                Some(Spacing::Pct(f)) => natural * f.max(0.0) * (1.0 - reduce),
+                // The reduction comes off the percentage (90 % less 20 % is 70 %), as PowerPoint
+                // applies `lnSpcReduction`.
+                Some(Spacing::Pct(f)) => natural * (f - reduce).max(f * 0.1).max(0.0),
                 Some(Spacing::Pts(v)) => v * (1.0 - reduce),
                 None => natural * (1.0 - reduce),
             };
@@ -1082,7 +1086,7 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
             ));
         }
         out.para_lines.push((first_line_idx, raw.len()));
-        prev_after = spacing_pts(props.space_after, p.lead_size, reduce).max(0.0);
+        prev_after = spacing_pts(props.space_after, p.lead_size).max(0.0);
     }
     let total = y;
     out.content_height = total;
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index f3d5db5d..f130780c 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -54,6 +54,37 @@ fn shrink_on_overflow() {
     assert!(!l.overflow || l.font_scale <= 0.11);
 }
 
+#[test]
+fn line_spacing_reduction_comes_off_the_percentage() {
+    // 90 % line spacing and 10 pt before paragraphs, shrunk with a 20 % line spacing reduction:
+    // PowerPoint draws 70 % lines and keeps the 10 pt.
+    let (p, mut sh) = setup("One\nTwo\nThree", 600.0, 400.0);
+    for (i, para) in sh.text.as_mut().unwrap().paragraphs.iter_mut().enumerate() {
+        para.props.line_spacing = Some(Spacing::Pct(0.9));
+        para.props.space_before = Some(Spacing::Pts(10.0));
+        para.props.bullet = Some(Bullet::None);
+        if i == 0 {
+            para.runs[0].text.push_str(" wraps onto a second line because this paragraph is long enough to wrap in a narrow box");
+        }
+    }
+    let ctx = Ctx::for_slide(&p, &p.slides[0]).unwrap();
+    let body = sh.text.clone().unwrap();
+    let bp = resolve::body(&ctx, &sh);
+    let opts = Opts { rect: Rect::new(0.0, 0.0, 200.0, 400.0), fields: &NoFields, prompt_color: None, no_shrink: true };
+    let full = layout_scaled(&ctx, &sh, &body, &bp, &opts, 1.0, 0.0);
+    let reduced = layout_scaled(&ctx, &sh, &body, &bp, &opts, 1.0, 0.2);
+    let pitch = |l: &TextLayout| l.lines[1].top - l.lines[0].top;
+    // Lines within the first paragraph: 0.7 / 0.9 of the full pitch.
+    assert!(full.lines[1].para == 0 && reduced.lines[1].para == 0);
+    assert!((pitch(&reduced) / pitch(&full) - 0.7 / 0.9).abs() < 0.005, "{} {}", pitch(&reduced), pitch(&full));
+    // The space before the next paragraph is the same 10 pt.
+    let gap = |l: &TextLayout| {
+        let k = l.lines.iter().position(|x| x.para == 1).unwrap();
+        l.lines[k].top - l.lines[k - 1].bottom
+    };
+    assert!((gap(&full) - 10.0).abs() < 1e-6 && (gap(&reduced) - 10.0).abs() < 1e-6, "{} {}", gap(&full), gap(&reduced));
+}
+
 #[test]
 fn caret_and_hit_roundtrip() {
     let (p, sh) = setup("Hello world", 600.0, 100.0);

From bb53f8c74177cba181651f6b0e8b5e1f56c34603 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B0=D0=B3=D0=B4=D0=B0=20=D0=9C=2E=D0=93=2E?=
 <mail@mgmagda.ru>
Date: Mon, 12 Oct 2026 17:09:14 +0300
Subject: [PATCH 052/376] Text: honour spcFirstLastPara (space before the first
 paragraph)

bodyPr spcFirstLastPara="1" makes the first paragraph's space before and
the last paragraph's space after count, which PowerPoint (and Google
Slides exports) use; we always dropped them, so such text sat a paragraph
gap too high (9.5 pt on a real deck measured against PowerPoint's PDF).
Read, written, inherited from the layout like the other body properties,
and applied in the layout.
---
 crates/model/src/resolve.rs  |  1 +
 crates/model/src/text.rs     |  3 +++
 crates/pptx/src/read/dml.rs  |  4 ++++
 crates/pptx/src/write/dml.rs |  3 ++-
 crates/text/src/lib.rs       |  7 +++++--
 crates/text/src/tests.rs     | 15 +++++++++++++++
 6 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/crates/model/src/resolve.rs b/crates/model/src/resolve.rs
index 8769b571..2c269251 100644
--- a/crates/model/src/resolve.rs
+++ b/crates/model/src/resolve.rs
@@ -221,6 +221,7 @@ pub fn body(ctx: &Ctx, shape: &Shape) -> BodyProps {
         warp: None,
         rtl_col: Some(false),
         upright: Some(false),
+        space_first_last: Some(false),
     });
     b
 }
diff --git a/crates/model/src/text.rs b/crates/model/src/text.rs
index addbdff1..dc268f10 100644
--- a/crates/model/src/text.rs
+++ b/crates/model/src/text.rs
@@ -101,6 +101,8 @@ pub struct BodyProps {
     pub rtl_col: Option<bool>,
     /// Keep text upright when the shape rotates.
     pub upright: Option<bool>,
+    /// Space before the first paragraph and after the last count too (`spcFirstLastPara`).
+    pub space_first_last: Option<bool>,
 }
 
 impl BodyProps {
@@ -122,6 +124,7 @@ impl BodyProps {
         }
         self.rtl_col = self.rtl_col.or(p.rtl_col);
         self.upright = self.upright.or(p.upright);
+        self.space_first_last = self.space_first_last.or(p.space_first_last);
     }
 }
 
diff --git a/crates/pptx/src/read/dml.rs b/crates/pptx/src/read/dml.rs
index b4f08e0d..a1e4950a 100644
--- a/crates/pptx/src/read/dml.rs
+++ b/crates/pptx/src/read/dml.rs
@@ -303,6 +303,7 @@ pub fn body_pr(b: &El) -> BodyProps {
         col_spacing: pt(b, "spcCol"),
         rtl_col: b.bool("rtlCol"),
         upright: b.bool("upright"),
+        space_first_last: b.bool("spcFirstLastPara"),
         ..Default::default()
     };
     for e in b.elements() {
@@ -568,5 +569,8 @@ mod tests {
         assert_eq!(b.vert, Some(TextDir::Vertical270));
         assert_eq!(b.columns, Some(2));
         assert_eq!(b.autofit, Some(AutoFit::Shrink { font_scale: 0.625, line_reduction: 0.2 }));
+        assert_eq!(b.space_first_last, None);
+        let d = parse(br#"<a:bodyPr spcFirstLastPara="1"/>"#).unwrap();
+        assert_eq!(body_pr(&d.root).space_first_last, Some(true));
     }
 }
diff --git a/crates/pptx/src/write/dml.rs b/crates/pptx/src/write/dml.rs
index eddb618e..e0234b6c 100644
--- a/crates/pptx/src/write/dml.rs
+++ b/crates/pptx/src/write/dml.rs
@@ -383,7 +383,8 @@ pub fn body_pr(w: &mut W, b: &BodyProps) {
         .b("rtlCol", b.rtl_col)
         .o("anchor", b.anchor.map(|a| a.xml()))
         .b("anchorCtr", b.anchor_ctr)
-        .b("upright", b.upright);
+        .b("upright", b.upright)
+        .b("spcFirstLastPara", b.space_first_last);
     let warp = b.warp.as_deref().filter(|s| !s.is_empty() && s.chars().all(|c| c.is_ascii_alphanumeric()));
     if warp.is_none() && b.autofit.is_none() {
         w.empty("a:bodyPr", a);
diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index 225f4afb..09e33727 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -879,6 +879,7 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
     let mut numbering: Vec<u32> = vec![0; 9];
     let mut all_lines: Vec<(LineInfo, LinePlace, f64, Option<(String, f64, f64)>)> = vec![];
     let mut prev_after = 0.0;
+    let first_last = bp.space_first_last.unwrap_or(false);
     let mut shaped_paras: Vec<ParaShaped> = Vec::with_capacity(body.paragraphs.len());
     for (pi, para) in body.paragraphs.iter().enumerate() {
         let lvl = para.level.min(8) as usize;
@@ -918,7 +919,8 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
         let first_w = (col_w - first_x - mr).max(1.0);
         let rest_w = (col_w - rest_x - mr).max(1.0);
         let raw = break_lines(p, first_w, rest_w, wrap, &tabs, props.default_tab.unwrap_or(72.0), first_x, rest_x);
-        let before = if pi == 0 { 0.0 } else { spacing_pts(props.space_before, p.lead_size, reduce) };
+        // The first paragraph's space before counts only when the body says so.
+        let before = if pi == 0 && !first_last { 0.0 } else { spacing_pts(props.space_before, p.lead_size, reduce) };
         y += before.max(0.0) + prev_after;
         let first_line_idx = all_lines.len();
         for (li, rl) in raw.iter().enumerate() {
@@ -1084,7 +1086,8 @@ fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts
         out.para_lines.push((first_line_idx, raw.len()));
         prev_after = spacing_pts(props.space_after, p.lead_size, reduce).max(0.0);
     }
-    let total = y;
+    // So does the last paragraph's space after.
+    let total = y + if first_last { prev_after } else { 0.0 };
     out.content_height = total;
     // Columns: distribute lines by height.
     let col_h = if ncols > 1 { inner.height() } else { f64::INFINITY };
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index f3d5db5d..e0be4cb2 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -54,6 +54,21 @@ fn shrink_on_overflow() {
     assert!(!l.overflow || l.font_scale <= 0.11);
 }
 
+#[test]
+fn space_before_the_first_paragraph_with_spc_first_last_para() {
+    // 10 pt before every paragraph: skipped on the first one, unless the body asks for it.
+    let (p, mut sh) = setup("One\nTwo", 600.0, 300.0);
+    for para in &mut sh.text.as_mut().unwrap().paragraphs {
+        para.props.space_before = Some(Spacing::Pts(10.0));
+        para.props.space_after = Some(Spacing::Pts(6.0));
+    }
+    let plain = lay(&p, &sh, 600.0, 300.0);
+    sh.text.as_mut().unwrap().body.space_first_last = Some(true);
+    let both = lay(&p, &sh, 600.0, 300.0);
+    assert!((both.lines[0].top - plain.lines[0].top - 10.0).abs() < 1e-6);
+    assert!((both.content_height - plain.content_height - 16.0).abs() < 1e-6);
+}
+
 #[test]
 fn caret_and_hit_roundtrip() {
     let (p, sh) = setup("Hello world", 600.0, 100.0);

From 30a5ee202dc104d177d9762924e46ca65f21cf6e Mon Sep 17 00:00:00 2001
From: "Ryan C. Shoemaker" <45581085+RCShoemaker@users.noreply.github.com>
Date: Mon, 12 Oct 2026 10:42:53 -0600
Subject: [PATCH 053/376] fix(cli): render refuses an unknown option instead of
 writing it as a file (#235)

`deckcraft-cli render` took any argument it didn't recognise as the output
path, so `render deck.pptx --help` rendered the slide into a file named
`--help`, and a mistyped option was silently ignored. An argument starting
with `-` that render doesn't know is now an error naming it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 apps/deckcraft-cli/src/main.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index c450393f..43cf7966 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -127,6 +127,7 @@ fn render(args: &[String]) -> Result<(), String> {
             "--all" => all = true,
             "--edit" => edit = true,
             "--scale" => scale = it.next().and_then(|v| v.parse().ok()).ok_or("--scale needs a number")?,
+            other if other.len() > 1 && other.starts_with('-') => return Err(format!("unknown render option `{other}`")),
             other
                 if input.is_none()
                     && !sample
@@ -278,3 +279,20 @@ fn mcp(args: &[String]) -> Result<(), String> {
     let stdin = std::io::stdin();
     server.serve(stdin.lock(), std::io::stdout()).map_err(|e| e.to_string())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn render_refuses_an_unknown_option_instead_of_writing_it_as_a_file() {
+        let out = std::env::temp_dir().join("deckcraft-cli-unknown-option.png");
+        let _ = std::fs::remove_file(&out);
+        for flag in ["--bogus", "-x", "--help"] {
+            let args: Vec<String> = ["--sample", flag, &out.to_string_lossy()].iter().map(|a| a.to_string()).collect();
+            let e = render(&args).unwrap_err();
+            assert!(e.contains(&format!("unknown render option `{flag}`")), "{flag}: {e}");
+            assert!(!out.exists(), "{flag}: rendered anyway");
+        }
+    }
+}

From 837e60ce651fb068f9ba2043004f46c57367b1c1 Mon Sep 17 00:00:00 2001
From: "Ryan C. Shoemaker" <45581085+RCShoemaker@users.noreply.github.com>
Date: Mon, 12 Oct 2026 10:42:53 -0600
Subject: [PATCH 054/376] Contributors: add my name (RCShoemaker)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 contributors/people.toml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/contributors/people.toml b/contributors/people.toml
index b852df13..92fd2399 100644
--- a/contributors/people.toml
+++ b/contributors/people.toml
@@ -37,3 +37,6 @@ sync_github_name = false
 
 [people.Johannesgauss]
 sync_github_name = true
+
+[people.RCShoemaker]
+real_name = "Ryan C. Shoemaker"

From 28f51bf8ad6ef0ddae497ae245e56ec1a5f702ad Mon Sep 17 00:00:00 2001
From: FabPei <FabPei@users.noreply.github.com>
Date: Mon, 12 Oct 2026 22:12:42 +0200
Subject: [PATCH 055/376] fix: DeckCraft upstream #104

Make text in grouped shapes editable: double-click reaches the
text-holding group member instead of being a no-op.
---
 crates/engine/src/tests.rs | 16 +++++++++++++
 crates/engine/src/tools.rs | 46 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..e967d7e1 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -381,6 +381,22 @@ fn double_click_in_table_uses_grown_row_heights() {
     assert_eq!(s.doc().unwrap().selection.text.as_ref().and_then(|t| t.cell), Some((0, 0)));
 }
 
+#[test]
+fn double_click_edits_text_inside_group() {
+    // A text member of a group is still editable: double-click reaches it through the group
+    // (regression: it used to be a no-op, so grouped text boxes could not be edited).
+    let mut s = session();
+    let a =
+        s.execute("shape.insert", &json!({"preset": "rect", "rect": [100.0, 100.0, 120.0, 50.0], "text": "Hello"})).unwrap()["id"].as_u64().unwrap();
+    let b = s.execute("shape.insert", &json!({"preset": "rect", "rect": [300.0, 200.0, 50.0, 50.0]})).unwrap()["id"].as_u64().unwrap();
+    s.execute("edit.select", &json!({"ids": [a, b]})).unwrap();
+    s.execute("arrange.group", &json!({})).unwrap();
+    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0 };
+    // Double-click the grouped text box: it becomes editable and targets that member.
+    s.pointer(ev(PointerKind::DoubleClick, 160.0, 125.0)).unwrap();
+    assert_eq!(s.doc().unwrap().selection.text.as_ref().map(|t| t.shape.0 as u64), Some(a));
+}
+
 #[test]
 fn grown_table_frame_covers_its_drawn_rows() {
     // Rows stored 4 pt tall are drawn taller: the box, its handles and hit tests follow the drawn rows.
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index 9a33933a..7b24b5b2 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -803,7 +803,18 @@ impl Session {
                         self.execute("text.edit", &json!({"id": id, "at": [pos.0, pos.1]}))?;
                         self.execute("text.selectWord", &json!({}))
                     }
-                    ShapeKind::Group { .. } => Ok(Value::Null),
+                    ShapeKind::Group { .. } => {
+                        // A group is a single selection unit, but its text stays editable:
+                        // double-click reaches the text-holding member under the cursor.
+                        match text_member_at(st, &sh, p, tol).and_then(|mid| st.shape(mid).cloned().map(|m| (mid, m))) {
+                            Some((mid, msh)) if !msh.is_line() => {
+                                let pos = text_pos(st, &msh, p);
+                                self.execute("text.edit", &json!({"id": mid, "at": [pos.0, pos.1]}))?;
+                                self.execute("text.selectWord", &json!({}))
+                            }
+                            _ => Ok(Value::Null),
+                        }
+                    }
                     _ => {
                         self.ui_requests.push(crate::UiRequest::Pane { id: "format".into() });
                         Ok(Value::Null)
@@ -1085,6 +1096,39 @@ fn is_text_first(st: &crate::DocState, id: ShapeId) -> bool {
     st.shape(id).is_some_and(|s| s.ph.is_some() || s.text_box)
 }
 
+/// The topmost text-holding shape under `p` inside group `sh`, recursing into nested groups.
+/// Group children live in the group's child space (`ShapeKind::Group::child`), so the point is
+/// mapped through `group_child_affine`, exactly as `hit_shape` does for group hit-testing.
+fn text_member_at(st: &crate::DocState, sh: &Shape, p: Point, tol: f64) -> Option<ShapeId> {
+    let ShapeKind::Group { children, child } = &sh.kind else { return None };
+    let x = xfrm_of(&st.doc, &st.selection, sh);
+    let ch = Rect::new(child.x, child.y, child.x + child.w, child.y + child.h);
+    member_at(children, deckcraft_geom::group_child_affine(&x, ch), p, tol)
+}
+
+/// Depth-first (topmost-first) search of `children` for a text-holding shape under `p`.
+/// `to_abs` maps this level's child space to slide space.
+fn member_at(children: &[Shape], to_abs: Affine, p: Point, tol: f64) -> Option<ShapeId> {
+    let q = to_abs.inverse() * p;
+    for c in children.iter().rev() {
+        let Some(cx) = c.xfrm else { continue };
+        let local = cx.affine().inverse() * q;
+        if local.x < -tol || local.y < -tol || local.x > cx.w + tol || local.y > cx.h + tol {
+            continue;
+        }
+        if let ShapeKind::Group { children: gc, child: gch } = &c.kind {
+            let gch = Rect::new(gch.x, gch.y, gch.x + gch.w, gch.y + gch.h);
+            let nested = to_abs * deckcraft_geom::group_child_affine(&cx, gch);
+            if let Some(id) = member_at(gc, nested, p, tol) {
+                return Some(id);
+            }
+        } else if matches!(c.kind, ShapeKind::Shape | ShapeKind::Connector { .. }) && !c.is_line() {
+            return Some(c.id);
+        }
+    }
+    None
+}
+
 fn contains_rect(outer: Rect, inner: Rect) -> bool {
     inner.x0 >= outer.x0 && inner.y0 >= outer.y0 && inner.x1 <= outer.x1 && inner.y1 <= outer.y1
 }

From 717e855cec895543c2b369d9939a9d738f8ab47a Mon Sep 17 00:00:00 2001
From: Yevhenii Hurin <evgeny.gurin@gmail.com>
Date: Mon, 12 Oct 2026 23:41:42 +0300
Subject: [PATCH 056/376] deckcraft-cli help explains the CLI to an agent

`deckcraft-cli help` and each subcommand's `--help` say what it does,
with a working example; `--help` never runs the subcommand. `describe`
spells out a command's parameters and what it acts on, `commands` lists
one command per line, and the MCP instructions say what format.* acts on.

[claude-opus-5-5] on behalf of hoblin
---
 ROADMAP.md                      |   1 +
 apps/deckcraft-cli/src/help.rs  | 153 ++++++++++++++++++++++++++++++++
 apps/deckcraft-cli/src/main.rs  | 131 +++++++++++++++++++--------
 apps/deckcraft-cli/tests/cli.rs | 136 ++++++++++++++++++++++++++++
 crates/engine/src/cmd/design.rs |   2 +-
 crates/engine/src/cmd/file.rs   |   4 +-
 crates/engine/src/cmd/format.rs |  12 +--
 crates/engine/src/cmd/mod.rs    | 125 ++++++++++++++++++++++++--
 crates/engine/src/cmd/shape.rs  |  22 ++++-
 crates/engine/src/cmd/table.rs  |  12 ++-
 crates/engine/src/cmd/text.rs   |   6 +-
 crates/engine/src/tests.rs      |  52 +++++++++++
 crates/mcp/src/server.rs        |   7 +-
 docs/control-protocol.md        |   4 +-
 docs/mcp.md                     |   2 +-
 15 files changed, 599 insertions(+), 70 deletions(-)
 create mode 100644 apps/deckcraft-cli/src/help.rs
 create mode 100644 apps/deckcraft-cli/tests/cli.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 801ddd84..6b0be0fb 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-12 | `deckcraft-cli help` and each subcommand's `--help` explain the CLI to an agent; `describe` spells out a command's parameters and what it acts on; `commands` lists one command per line |
 | 2026-10-10 | Progress docs restructured to the craftrules standard; full re-measure (breadth 79%, ready ~55%, mainstream ~53%, essentials ~62%, alpha). Landed: Animation Painter (#54), Morph geometry outlines (#27), animated GIF playback (#39), hyperlink colour and following links in the show (#37, #45), date fields in their own format (#36), flipped shapes keep readable text (#35), show transition fix (#46), start screen from the Home button (#49), MCP export lists PDF (#65), OmaStore manifest (#57) |
 | 2026-10-09 | v0.4.0 released. UAX #9 bidi and Arabic shaping (#4), Morph with Words and Characters (#5), tables grow to fit and PDF cell text (#14), rotating log file (#7), DX12 default on Windows (#16), H.264/HEVC overflow hardening (#2), PPTX sniffing anywhere in the zip (#19) |
 | 2026-10-08 | v0.2.0 and v0.3.0 released: Windows arm64, Flatpak aarch64, AppImage zsync updates, branded DMG |
diff --git a/apps/deckcraft-cli/src/help.rs b/apps/deckcraft-cli/src/help.rs
new file mode 100644
index 00000000..1b76001f
--- /dev/null
+++ b/apps/deckcraft-cli/src/help.rs
@@ -0,0 +1,153 @@
+pub struct Subcommand {
+    pub name: &'static str,
+    pub usage: &'static str,
+    pub summary: &'static str,
+    pub details: &'static str,
+}
+
+pub const SUBCOMMANDS: &[Subcommand] = &[
+    Subcommand {
+        name: "info",
+        usage: "info FILE",
+        summary: "print a presentation's slides, layouts and theme as JSON",
+        details: "Prints FILE (.deckcraft or .pptx) as JSON: its slides (index, id, title, layout, how many shapes,
+notes, transition), its layouts, theme fonts, sections and slide size.
+
+The shapes of one slide, with their ids, boxes and text, come from the slide.inspect command:
+
+  deckcraft-cli run --in deck.deckcraft --print --cmd 'slide.inspect={\"index\":0}'",
+    },
+    Subcommand {
+        name: "render",
+        usage: "render (FILE | --sample) [--slide N | --all] [--scale S] [--edit] OUT",
+        summary: "draw slides as PNG images",
+        details: "Draws slides of FILE, or of the sample presentation with --sample, as PNG images. FILE comes first;
+OUT is the image to write. With --all, OUT is a folder that gets one slide-01.png, slide-02.png… per
+slide. Prints each image's path and size.
+
+  --slide N   the slide at index N; indices start at 0, and 0 is the default
+  --scale S   pixels per point, 2 by default: a 960×540 slide becomes 1920×1080
+  --edit      draw what the editor shows: placeholder prompts and their dashed outlines
+
+  deckcraft-cli render deck.deckcraft --slide 2 slide-3.png",
+    },
+    Subcommand {
+        name: "convert",
+        usage: "convert IN OUT",
+        summary: "save a presentation in the format OUT's extension names",
+        details: "Opens IN (.deckcraft or .pptx) and writes it to OUT, in the format OUT's extension names:
+.deckcraft, .pptx, .pdf, .txt or .md for the outline, .png or .jpg for the first slide. Any other
+extension is written as .deckcraft. Prints OUT.
+
+  deckcraft-cli convert deck.deckcraft deck.pptx",
+    },
+    Subcommand {
+        name: "run",
+        usage: "run [--in FILE | --sample] [--cmd COMMAND[=PARAMS]]... [--save OUT] [--export OUT] [--print]",
+        summary: "run commands on a presentation, then save or export it",
+        details: "Runs commands, in order, on one presentation: FILE with --in, the sample presentation with --sample,
+else a new one with an empty title slide. Then --save writes the presentation: .deckcraft keeps
+everything; .pptx, .pdf and .md (the outline) are written as convert writes them. --export writes the
+current slide as .png or .jpg, or the presentation as .pdf or .pptx.
+
+Each --cmd is one command: COMMAND is a command id, then `=`, then the command's parameters as one
+JSON object. Quote it for the shell. A command that needs no parameters is just its id.
+
+  deckcraft-cli run \\
+    --cmd 'slide.new={\"layout\":\"titleOnly\",\"title\":\"Q3 results\"}' \\
+    --cmd 'shape.insert={\"preset\":\"roundRect\",\"rect\":[80,160,320,120],\"text\":\"Revenue\"}' \\
+    --cmd 'format.size={\"size\":28}' \\
+    --save q3.deckcraft
+
+`deckcraft-cli commands` lists the command ids; `deckcraft-cli describe COMMAND` explains one and its
+parameters.
+
+What the ids don't say:
+- Positions and sizes are in points on a 960×540 slide, x to the right and y down; a rect is
+  [x, y, width, height].
+- Slide indices start at 0. slide.new inserts after the current slide and makes the new one current;
+  slide.go {\"index\": N} makes slide N current.
+- Shape ids are looked up on the current slide only.
+- A command that adds a shape (shape.insert, insert.textBox, insert.table…) selects it. format.* acts
+  on the selected text or shapes; edit.select {\"ids\": [...]} selects others. Many shape commands
+  take the ids directly; `deckcraft-cli describe COMMAND` says what a command acts on.
+
+If a command fails, run stops there and saves nothing. --print shows each command's answer, such as
+the id of an inserted shape.",
+    },
+    Subcommand {
+        name: "commands",
+        usage: "commands [FILTER]",
+        summary: "list the commands run can use, one per line",
+        details: "Lists the commands that run --cmd, app and the MCP server take, one per line: the id, its name in
+the app and its parameters. FILTER keeps the commands whose id or name contains it, ignoring case.
+
+  deckcraft-cli commands format.
+
+In the parameters, `?` marks an optional one, a spaced ` | ` separates alternatives and `→` shows what
+the command answers. `deckcraft-cli describe COMMAND` spells one command out.",
+    },
+    Subcommand {
+        name: "describe",
+        usage: "describe COMMAND",
+        summary: "explain one command and its parameters",
+        details: "Explains one command: what it is in the app, each of its parameters, what it answers, and how run
+calls it.
+
+  deckcraft-cli describe shape.insert",
+    },
+    Subcommand {
+        name: "app",
+        usage: "app [--port PORT] COMMAND [PARAMS] | --method METHOD [PARAMS]",
+        summary: "run a command in the DeckCraft app started with --control",
+        details: "Sends one request to the DeckCraft app started with `deckcraft --control PORT` (port 7979 by default)
+and prints its answer as JSON. COMMAND [PARAMS] runs a command, as run --cmd does; --method METHOD
+[PARAMS] calls a control-channel method such as ui.screenshot. PARAMS is a JSON object.
+
+  deckcraft-cli app shape.insert '{\"preset\":\"star5\",\"rect\":[100,100,200,200]}'
+  deckcraft-cli app --method ui.screenshot '{\"path\":\"/tmp/shot.png\"}'",
+    },
+    Subcommand {
+        name: "mcp",
+        usage: "mcp [--connect PORT] [--sample]",
+        summary: "serve the commands to an agent over MCP on stdio",
+        details: "Runs a Model Context Protocol server on stdin and stdout. It works on its own presentation without a
+window, or with --connect PORT (or host:port) on the DeckCraft app started with --control PORT.
+--sample opens the sample presentation.",
+    },
+    Subcommand {
+        name: "links",
+        usage: "links",
+        summary: "print the DeckCraft community and project links",
+        details: "Prints the DeckCraft community and project links.",
+    },
+    Subcommand { name: "version", usage: "--version", summary: "print the version", details: "Prints the version of deckcraft-cli." },
+];
+
+pub fn page(name: &str) -> Option<String> {
+    let name = match name {
+        "help" | "--help" | "-h" => return Some(overview()),
+        "--version" | "-V" => "version",
+        name => name,
+    };
+    SUBCOMMANDS.iter().find(|s| s.name == name).map(|s| format!("usage: deckcraft-cli {}\n\n{}", s.usage, s.details))
+}
+
+pub fn overview() -> String {
+    let width = SUBCOMMANDS.iter().map(|s| s.usage.split(' ').next().unwrap_or_default().len()).max().unwrap_or_default();
+    let list: Vec<String> =
+        SUBCOMMANDS.iter().map(|s| format!("  {:<width$}  {}", s.usage.split(' ').next().unwrap_or_default(), s.summary)).collect();
+    format!(
+        "deckcraft-cli works on DeckCraft presentations (.deckcraft, .pptx) without a window.
+
+{}
+
+A presentation is edited by running commands on it:
+
+  deckcraft-cli run --cmd 'slide.new={{\"title\":\"Q3 results\"}}' --save q3.deckcraft
+
+`deckcraft-cli help SUBCOMMAND`, or `deckcraft-cli SUBCOMMAND --help`, explains one subcommand;
+`deckcraft-cli help run` explains commands.",
+        list.join("\n")
+    )
+}
diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index c450393f..7b36288f 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -1,19 +1,9 @@
-//! Headless DeckCraft.
-//!
-//! ```text
-//! deckcraft-cli info FILE                       # slides, titles, layouts (JSON)
-//! deckcraft-cli render (FILE | --sample) [--slide N | --all] [--scale S] OUT.png|OUT_DIR
-//! deckcraft-cli convert IN OUT                  # .deckcraft ⇄ .pptx, outline .txt, .png (first slide)
-//! deckcraft-cli run [--in FILE | --sample] [--cmd ID[=JSON]]... [--save OUT] [--export OUT] [--print]
-//! deckcraft-cli commands [FILTER]               # list commands (JSON)
-//! deckcraft-cli describe ID                     # one command
-//! deckcraft-cli app [--port PORT] COMMAND [JSON] | --method METHOD [JSON]   # drive the running app
-//! deckcraft-cli mcp [--connect PORT] [--sample] # MCP server over stdio
-//! deckcraft-cli links | --version
-//! ```
+//! Headless DeckCraft. `deckcraft-cli help` explains each subcommand (`help.rs`).
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
 
+mod help;
+
 use std::process::ExitCode;
 
 use deckcraft_engine::Session;
@@ -32,20 +22,28 @@ macro_rules! outln {
     }};
 }
 
-const USAGE: &str = "usage: deckcraft-cli info FILE
-       deckcraft-cli render (FILE | --sample) [--slide N | --all] [--scale S] [--edit] OUT
-       deckcraft-cli convert IN OUT
-       deckcraft-cli run [--in FILE | --sample] [--cmd ID[=JSON]]... [--save OUT] [--export OUT] [--print]
-       deckcraft-cli commands [FILTER]
-       deckcraft-cli describe COMMAND
-       deckcraft-cli app [--port PORT] COMMAND [JSON] | --method METHOD [JSON]
-       deckcraft-cli mcp [--connect PORT] [--sample]
-       deckcraft-cli links | --version";
-
 fn main() -> ExitCode {
     let args: Vec<String> = std::env::args().skip(1).collect();
     let rest = args.get(1..).unwrap_or(&[]);
+    let asks_help = rest.iter().any(|a| a == "--help" || a == "-h");
+    if let Some(page) = args.first().filter(|_| asks_help).and_then(|n| help::page(n)) {
+        outln!("{page}");
+        return ExitCode::SUCCESS;
+    }
     match args.first().map(String::as_str) {
+        Some("help" | "--help" | "-h") => match rest.first() {
+            None => {
+                outln!("{}", help::overview());
+                ExitCode::SUCCESS
+            }
+            Some(name) => match help::page(name) {
+                Some(page) => {
+                    outln!("{page}");
+                    ExitCode::SUCCESS
+                }
+                None => unknown(name),
+            },
+        },
         Some("--version" | "-V" | "version") => {
             outln!("deckcraft-cli {}", env!("CARGO_PKG_VERSION"));
             ExitCode::SUCCESS
@@ -55,15 +53,16 @@ fn main() -> ExitCode {
         Some("convert") => report(convert(rest)),
         Some("run") => report(run(rest)),
         Some("commands") => {
-            let s = Session::new();
             let f = rest.first().map(|x| x.to_lowercase());
-            let list: Vec<Value> = s
-                .commands()
-                .into_iter()
+            for c in deckcraft_engine::command_specs()
+                .iter()
                 .filter(|c| f.as_ref().is_none_or(|f| c.id.to_lowercase().contains(f.as_str()) || c.label.to_lowercase().contains(f.as_str())))
-                .map(|c| serde_json::to_value(c).unwrap_or_default())
-                .collect();
-            outln!("{}", serde_json::to_string_pretty(&list).unwrap_or_default());
+            {
+                match c.params.strip_prefix("{}") {
+                    Some(answer) => outln!("{} — {}{answer}", c.id, c.label),
+                    None => outln!("{} — {}: {}", c.id, c.label, c.params),
+                }
+            }
             ExitCode::SUCCESS
         }
         Some("describe") => report(describe(rest.first().map(String::as_str))),
@@ -74,14 +73,22 @@ fn main() -> ExitCode {
             outln!("Discord   {DISCORD}\nWebsite   {WEBSITE}\nApp page  {APP_PAGE}\nGitHub    {GITHUB}");
             ExitCode::SUCCESS
         }
-        _ => {
-            eprintln!("{USAGE}");
-            eprintln!("\nCommunity: {}  ·  {}", deckcraft_engine::links::DISCORD, deckcraft_engine::links::APP_PAGE);
-            ExitCode::FAILURE
-        }
+        Some(other) => unknown(other),
+        None => usage(),
     }
 }
 
+fn unknown(sub: &str) -> ExitCode {
+    eprintln!("deckcraft-cli: unknown subcommand `{sub}`\n");
+    usage()
+}
+
+fn usage() -> ExitCode {
+    eprintln!("{}", help::overview());
+    eprintln!("\nCommunity: {}  ·  {}", deckcraft_engine::links::DISCORD, deckcraft_engine::links::APP_PAGE);
+    ExitCode::FAILURE
+}
+
 fn report(r: Result<(), String>) -> ExitCode {
     match r {
         Ok(()) => ExitCode::SUCCESS,
@@ -218,11 +225,61 @@ fn run(args: &[String]) -> Result<(), String> {
 
 fn describe(id: Option<&str>) -> Result<(), String> {
     let id = id.ok_or("describe needs a command id")?;
-    let c = deckcraft_engine::find_command(id).ok_or_else(|| format!("unknown command `{id}`"))?;
-    outln!("{}  —  {}\n  where:    {}\n  shortcut: {}\n  params:   {}", c.id, c.label, c.menu.join(" ▸ "), c.shortcut.unwrap_or("—"), c.params);
+    let c = deckcraft_engine::find_command(id).ok_or_else(|| deckcraft_engine::EngineError::UnknownCommand(id.into()).to_string())?;
+    let mut head = format!("{}: {}", c.id, c.label);
+    if !c.menu.is_empty() {
+        head.push_str(&format!(", in {}", c.menu.join(" ▸ ")));
+    }
+    if let Some(k) = c.shortcut {
+        head.push_str(&format!(", shortcut {k}"));
+    }
+    outln!("{head}.\n");
+    let (args, answer) = c.params.split_once('→').unwrap_or((c.params, ""));
+    let parsed = deckcraft_engine::cmd::parse_params(c.params);
+    match &parsed {
+        Err(_) => outln!("Parameters: {}", args.trim()),
+        Ok(params) if params.is_empty() => outln!("Takes no parameters."),
+        Ok(params) => print_params(params),
+    }
+    let params = parsed.unwrap_or_default();
+    if let Some(acts) = c.acts_on() {
+        outln!("{acts}");
+    }
+    let remark = remark(args);
+    if !remark.is_empty() {
+        outln!("Note: {remark}");
+    }
+    if !answer.trim().is_empty() {
+        outln!("Answers with {}.", answer.trim());
+    }
+    let call = if params.iter().all(|p| p.optional) { c.id.to_string() } else { format!("'{}={{…}}'", c.id) };
+    outln!("\nRun it with: deckcraft-cli run --cmd {call}");
     Ok(())
 }
 
+fn print_params(params: &[deckcraft_engine::cmd::Param]) {
+    let name = |p: &deckcraft_engine::cmd::Param| {
+        let or = if p.or { "or " } else { "" };
+        let optional = if p.optional { ", optional" } else { "" };
+        format!("{or}{}{optional}", p.name)
+    };
+    let width = params.iter().map(|p| name(p).chars().count()).max().unwrap_or_default();
+    let sets = params.iter().map(|p| p.object).max().unwrap_or_default() > 0;
+    outln!("Parameters:");
+    for (k, p) in params.iter().enumerate() {
+        if sets && params.get(k.wrapping_sub(1)).is_none_or(|before| before.object != p.object) {
+            outln!("  {}", if p.object == 0 { "either:" } else { "or:" });
+        }
+        let indent = if sets { "    " } else { "  " };
+        outln!("{}", format!("{indent}{:<width$}  {}", name(p), p.about).trim_end());
+    }
+}
+
+fn remark(args: &str) -> &str {
+    let after = args.rfind('}').and_then(|i| args.get(i + 1..)).unwrap_or_default().trim().trim_start_matches('—').trim();
+    after.strip_prefix('(').and_then(|n| n.strip_suffix(')')).unwrap_or(after)
+}
+
 fn app(args: &[String]) -> Result<(), String> {
     use deckcraft_mcp::{Backend, Remote, control_addr};
     let mut port = deckcraft_mcp::DEFAULT_PORT.to_string();
diff --git a/apps/deckcraft-cli/tests/cli.rs b/apps/deckcraft-cli/tests/cli.rs
new file mode 100644
index 00000000..4cb8c32e
--- /dev/null
+++ b/apps/deckcraft-cli/tests/cli.rs
@@ -0,0 +1,136 @@
+use std::process::{Command, Output};
+
+fn cli(args: &[&str]) -> Output {
+    Command::new(env!("CARGO_BIN_EXE_deckcraft-cli")).args(args).output().unwrap()
+}
+
+fn stdout(o: &Output) -> String {
+    assert!(o.status.success(), "exit {:?}\nstderr: {}", o.status, String::from_utf8_lossy(&o.stderr));
+    String::from_utf8_lossy(&o.stdout).into_owned()
+}
+
+fn stderr(o: &Output) -> String {
+    assert!(!o.status.success(), "exit {:?}\nstdout: {}", o.status, String::from_utf8_lossy(&o.stdout));
+    String::from_utf8_lossy(&o.stderr).into_owned()
+}
+
+const SUBCOMMANDS: [&str; 9] = ["info", "render", "convert", "run", "commands", "describe", "app", "mcp", "links"];
+
+fn words(s: &str) -> String {
+    s.split_whitespace().collect::<Vec<_>>().join(" ")
+}
+
+#[test]
+fn an_unknown_subcommand_is_named_before_the_overview() {
+    for args in [vec!["frobnicate"], vec!["help", "frobnicate"], vec!["--info", "--help"]] {
+        let err = stderr(&cli(&args));
+        assert!(err.contains("unknown subcommand `") && err.contains("\n\ndeckcraft-cli works on"), "{args:?}: {err}");
+    }
+}
+
+#[test]
+fn no_subcommand_shows_the_overview_and_fails() {
+    assert!(stderr(&cli(&[])).starts_with("deckcraft-cli works on"));
+}
+
+#[test]
+fn help_lists_every_subcommand_with_a_run_example() {
+    for flag in ["help", "--help", "-h"] {
+        let out = stdout(&cli(&[flag]));
+        for sub in SUBCOMMANDS {
+            assert!(out.contains(&format!("\n  {sub} ")), "{flag} lacks {sub}: {out}");
+        }
+        assert!(out.contains("deckcraft-cli run --cmd 'slide.new={\"title\":\"Q3 results\"}' --save q3.deckcraft"), "{out}");
+    }
+}
+
+#[test]
+fn every_subcommand_answers_help_and_does_nothing_else() {
+    let dir = std::env::temp_dir().join(format!("dc-cli-help-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    for sub in SUBCOMMANDS {
+        for args in [vec![sub, "--help"], vec![sub, "-h", "out.png"], vec!["help", sub]] {
+            let o = Command::new(env!("CARGO_BIN_EXE_deckcraft-cli")).current_dir(&dir).args(&args).output().unwrap();
+            assert!(stdout(&o).starts_with(&format!("usage: deckcraft-cli {sub}")), "{args:?}");
+        }
+    }
+    assert_eq!(std::fs::read_dir(&dir).unwrap().count(), 0, "help wrote nothing");
+    std::fs::remove_dir_all(&dir).unwrap();
+    for args in [["help", "version"], ["--version", "--help"]] {
+        assert!(stdout(&cli(&args)).starts_with("usage: deckcraft-cli --version"), "{args:?}");
+    }
+    for args in [["help", "help"], ["help", "--help"]] {
+        assert!(stdout(&cli(&args)).starts_with("deckcraft-cli works on"), "{args:?}");
+    }
+}
+
+#[test]
+fn run_help_says_what_the_ids_do_not() {
+    let out = words(&stdout(&cli(&["run", "--help"])));
+    for fact in [
+        "COMMAND is a command id, then `=`, then the command's parameters as one JSON object.",
+        "points on a 960×540 slide",
+        "Slide indices start at 0.",
+        "Shape ids are looked up on the current slide only.",
+        "A command that adds a shape (shape.insert, insert.textBox, insert.table…) selects it.",
+        "format.* acts on the selected text or shapes",
+    ] {
+        assert!(out.contains(fact), "{fact}: {out}");
+    }
+}
+
+#[test]
+fn describe_spells_out_a_command() {
+    assert_eq!(
+        stdout(&cli(&["describe", "shape.insert"])),
+        "shape.insert: Shapes, in Insert ▸ Illustrations.
+
+Parameters:
+  preset          rect|roundRect|ellipse|triangle|rightArrow|star5|… (see shape.presets)
+  rect            [x,y,w,h] pt
+  text, optional  string
+
+Run it with: deckcraft-cli run --cmd 'shape.insert={…}'
+"
+    );
+    assert_eq!(
+        stdout(&cli(&["describe", "format.size"])),
+        "format.size: Font Size, in Home ▸ Font.
+
+Parameters:
+  size  pt
+Acts on the selected text or shapes.
+
+Run it with: deckcraft-cli run --cmd 'format.size={…}'
+"
+    );
+    assert!(stdout(&cli(&["describe", "edit.copy"])).contains("Answers with {text}.\n\nRun it with: deckcraft-cli run --cmd edit.copy\n"));
+    assert!(stdout(&cli(&["describe", "text.set"])).contains("Note: replaces the whole text, keeping the first run's formatting\n"));
+    assert_eq!(
+        stdout(&cli(&["describe", "shape.setDefault"])),
+        "shape.setDefault: Set as Default Shape.\n\nTakes no parameters.\nActs on the selected shapes.\n\nRun it with: deckcraft-cli run --cmd shape.setDefault\n"
+    );
+}
+
+#[test]
+fn describe_shows_alternative_sets_of_parameters() {
+    assert!(stdout(&cli(&["describe", "slide.go"])).contains("Parameters:\n  either:\n    index\n  or:\n    id\n"));
+    assert!(stdout(&cli(&["describe", "shape.move"])).contains(
+        "  either:
+    dx, optional   pt (relative)
+    dy, optional   pt (relative)
+    ids, optional
+  or:
+    x, optional    pt (absolute)
+    y, optional    pt (absolute)
+    ids, optional
+"
+    ));
+}
+
+#[test]
+fn commands_lists_one_line_per_command() {
+    assert_eq!(stdout(&cli(&["commands", "format.size"])), "format.size — Font Size: {size: pt}\n");
+    assert_eq!(stdout(&cli(&["commands", "slide.next"])), "slide.next — Next Slide\n");
+    assert_eq!(stdout(&cli(&["commands", "shape.presets"])), "shape.presets — Shape Gallery → [{name, label, category}]\n");
+}
diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 641ddffc..0483bd95 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -33,7 +33,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Slide Size",
             ["Design", "Customize"],
             None,
-            "{preset?: widescreen|standard|… | w, h: pt, scale?: maximize|ensureFit|none}",
+            "{preset: widescreen|standard|…, scale?: maximize|ensureFit|none} | {w: pt, h: pt, scale?: maximize|ensureFit|none}",
             has_doc,
             slide_size
         ),
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index 55aac8bd..8bf937a0 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -15,7 +15,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!(noundo "file.saveAs", "Save As…", ["File"], Some("Cmd+Shift+S"), "{path, format?}", has_doc, save_as),
         cmd!(noundo "file.saveTemplate", "Save as Template…", ["File"], None, "{path}", has_doc, save_as),
         cmd!(query "file.saveBytes", "Save to Data", [], None, "{format?: deckcraft|pptx} → {data: base64}", has_doc, save_bytes_cmd),
-        cmd!(noundo "file.export", "Export…", ["File"], None, "{path, format: png|jpeg|pptx|deckcraft|outline|pdf, slide?: index, all?: bool, scale?: px per pt; pdf: layout?: slides|notes|handouts, perPage?: 1|2|3|4|6|9, dpi?, slides?: [index], includeHidden?, textLayer?, frame?}", has_doc, export),
+        cmd!(noundo "file.export", "Export…", ["File"], None, "{path, format?: png|jpeg|pptx|deckcraft|outline|pdf (else by path), slide?: index, all?: bool, scale?: px per pt, layout?: slides|notes|handouts (pdf), perPage?: 1|2|3|4|6|9, dpi?, slides?: [index], includeHidden?, textLayer?, frame?}", has_doc, export),
         cmd!(query "file.render", "Render Slide", [], None, "{slide?: index, scale?, edit?: bool} → {png: base64, width, height}", has_doc, render),
         cmd!(noundo "file.close", "Close", ["File"], Some("Cmd+W"), "{}", has_doc, close),
         cmd!(
@@ -30,7 +30,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!(noundo "file.recovery.save", "Save AutoRecover Information", [], None, "{} → {written}", has_doc, recovery_save),
         cmd!(query "file.recovery.list", "Recovered Presentations", [], None, "{} → [{uid, path, title, saved}]", always, recovery_list),
         cmd!(noundo "file.recovery.open", "Open Recovered Presentations", [], None, "{} → {opened: [document index]}", always, recovery_open),
-        cmd!(noundo "file.recovery.discard", "Discard Recovered Presentations", [], None, "{uid?: one entry, else all}", always, recovery_discard),
+        cmd!(noundo "file.recovery.discard", "Discard Recovered Presentations", [], None, "{uid?: one entry (else all)}", always, recovery_discard),
         cmd!(noundo "file.revert", "Revert", [], None, "{}", has_doc, revert),
         cmd!(noundo "window.next", "Next Window", ["Window"], Some("Cmd+`"), "{index?}", has_doc, next_window),
     ]
diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index f02a9a26..ba74aa9c 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -39,15 +39,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("format.size", "Font Size", ["Home", "Font"], None, "{size: pt}", has_text_or_shapes, size),
         cmd!("format.grow", "Increase Font Size", ["Home", "Font"], Some("Cmd+Shift+."), "{}", has_text_or_shapes, grow),
         cmd!("format.shrink", "Decrease Font Size", ["Home", "Font"], Some("Cmd+Shift+,"), "{}", has_text_or_shapes, shrink),
-        cmd!(
-            "format.color",
-            "Font Color",
-            ["Home", "Font"],
-            None,
-            "{color: #RRGGBB | accent1..6 | tx1… | {scheme, lumMod…}}",
-            has_text_or_shapes,
-            color
-        ),
+        cmd!("format.color", "Font Color", ["Home", "Font"], None, "{color: #RRGGBB|accent1..6|tx1…|{scheme, lumMod…}}", has_text_or_shapes, color),
         cmd!("format.highlight", "Text Highlight Color", ["Home", "Font"], None, "{color? (absent = none)}", has_text_or_shapes, highlight),
         cmd!("format.case", "Change Case", ["Home", "Font"], Some("Shift+F3"), "{mode: sentence|lower|upper|title|toggle}", has_text_or_shapes, case),
         cmd!("format.caps", "Caps", [], None, "{caps: none|small|all}", has_text_or_shapes, caps),
@@ -149,7 +141,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Text Box Margins",
             ["Format Shape", "Text Box"],
             None,
-            "{left?, top?, right?, bottom?: pt}",
+            "{left?: pt, top?: pt, right?: pt, bottom?: pt}",
             has_text_or_shapes,
             margins
         ),
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index 29c7013e..9cd8e4f1 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -53,6 +53,27 @@ pub struct CommandInfo {
 }
 
 impl CommandSpec {
+    pub fn acts_on(&self) -> Option<String> {
+        let keys = param_keys(self.params).unwrap_or_default();
+        let named = if keys.contains(&"ids") {
+            Some("the shapes in `ids`")
+        } else if keys.contains(&"id") {
+            Some("the shape in `id`")
+        } else {
+            None
+        };
+        let reason = (self.enabled)(&Session::with_new()).err()?;
+        Some(match (reason.as_str(), named) {
+            (SELECT_TEXT_OR_SHAPE, _) => "Acts on the selected text or shapes.".into(),
+            (NOTHING_SELECTED, Some(n)) => format!("Acts on {n}, else on the selected shapes."),
+            (NOTHING_SELECTED, None) => "Acts on the selected shapes.".into(),
+            (SELECT_TWO, Some(n)) => format!("Acts on two or more shapes: {n}, else the selected ones."),
+            (SELECT_TWO, None) => "Acts on two or more selected shapes.".into(),
+            (NO_TEXT_POINT, _) => "Acts on the text being edited; text.edit starts editing a shape's text.".into(),
+            _ => return None,
+        })
+    }
+
     pub fn info(&self, s: &Session) -> CommandInfo {
         let e = (self.enabled)(s);
         CommandInfo {
@@ -79,6 +100,8 @@ pub fn has_slide(s: &Session) -> std::result::Result<(), String> {
 }
 pub const NOTHING_SELECTED: &str = "nothing selected";
 pub const SELECT_TWO: &str = "select two or more objects";
+pub const NO_TEXT_POINT: &str = "no text insertion point";
+pub const SELECT_TEXT_OR_SHAPE: &str = "select text or a shape";
 pub fn has_selection(s: &Session) -> std::result::Result<(), String> {
     has_doc(s)?;
     if s.active().is_some_and(|d| !d.selection.shapes.is_empty()) { Ok(()) } else { Err(NOTHING_SELECTED.into()) }
@@ -89,17 +112,14 @@ pub fn has_two(s: &Session) -> std::result::Result<(), String> {
 }
 pub fn has_text(s: &Session) -> std::result::Result<(), String> {
     has_doc(s)?;
-    if s.active().is_some_and(|d| d.selection.text.is_some()) { Ok(()) } else { Err("no text insertion point".into()) }
+    if s.active().is_some_and(|d| d.selection.text.is_some()) { Ok(()) } else { Err(NO_TEXT_POINT.into()) }
 }
 /// Text editing or shapes with text selected (formatting commands apply to either).
 pub fn has_text_or_shapes(s: &Session) -> std::result::Result<(), String> {
     has_doc(s)?;
-    if s.active().is_some_and(|d| d.selection.text.is_some() || !d.selection.shapes.is_empty()) {
-        Ok(())
-    } else {
-        Err("select text or a shape".into())
-    }
+    if s.active().is_some_and(|d| d.selection.text.is_some() || !d.selection.shapes.is_empty()) { Ok(()) } else { Err(SELECT_TEXT_OR_SHAPE.into()) }
 }
+
 pub fn can_undo(s: &Session) -> std::result::Result<(), String> {
     if s.active().is_some_and(|d| !d.history.undo.is_empty()) { Ok(()) } else { Err("nothing to undo".into()) }
 }
@@ -148,6 +168,99 @@ pub fn find_command(id: &str) -> Option<&'static CommandSpec> {
     command_specs().iter().find(|c| c.id == id)
 }
 
+pub(crate) fn param_keys(doc: &str) -> std::result::Result<Vec<&str>, String> {
+    let mut keys = vec![];
+    for p in parse_params(doc)? {
+        if !keys.contains(&p.name) {
+            keys.push(p.name);
+        }
+    }
+    Ok(keys)
+}
+
+#[derive(Debug, PartialEq)]
+pub struct Param<'a> {
+    pub name: &'a str,
+    pub optional: bool,
+    /// What the doc says of it: its values, unit or remark (`rect|roundRect|…`, `[x,y,w,h] pt`).
+    pub about: &'a str,
+    /// An alternative to the parameter before it in the same object (`color? | none?`).
+    pub or: bool,
+    /// Which of the doc's alternative objects it belongs to: `{index} | {id}` puts id in object 1.
+    pub object: usize,
+}
+
+/// The top-level parameters of a params doc: `{preset, rect?: [x,y,w,h] pt} | {id}` gives preset,
+/// rect (optional, `[x,y,w,h] pt`) and id (in the second object). Text after `→` is the result
+/// and is skipped. Errs where the doc strays from that grammar.
+pub fn parse_params(doc: &str) -> std::result::Result<Vec<Param<'_>>, String> {
+    let doc = doc.split('→').next().unwrap_or_default();
+    let mut params: Vec<Param> = vec![];
+    let mut open: Vec<char> = vec![];
+    let mut expect_key = false;
+    let mut or = false;
+    let mut objects: usize = 0;
+    let mut about_from: Option<usize> = None;
+    let mut chars = doc.char_indices().peekable();
+    let mut prev = ' ';
+    fn end_about<'a>(doc: &'a str, params: &mut [Param<'a>], from: &mut Option<usize>, to: usize) {
+        if let (Some(f), Some(p)) = (from.take(), params.last_mut()) {
+            p.about = doc.get(f..to).unwrap_or_default().trim();
+        }
+    }
+    while let Some((i, c)) = chars.next() {
+        let in_object = open == ['{'];
+        match c {
+            '{' | '[' | '(' => {
+                open.push(c);
+                if open == ['{'] {
+                    expect_key = true;
+                    objects += 1;
+                    or = false;
+                }
+            }
+            '}' | ']' | ')' => {
+                if in_object {
+                    end_about(doc, &mut params, &mut about_from, i);
+                }
+                open.pop();
+            }
+            ',' if in_object => {
+                end_about(doc, &mut params, &mut about_from, i);
+                expect_key = true;
+            }
+            '|' if in_object && prev == ' ' && chars.peek().is_some_and(|(_, n)| *n == ' ') => {
+                end_about(doc, &mut params, &mut about_from, i);
+                expect_key = true;
+                or = true;
+            }
+            c if in_object && expect_key && (c.is_ascii_alphabetic() || c == '_') => {
+                let mut end = i + c.len_utf8();
+                while let Some((j, n)) = chars.peek().copied().filter(|(_, n)| n.is_ascii_alphanumeric() || *n == '_') {
+                    end = j + n.len_utf8();
+                    chars.next();
+                }
+                let after = doc.get(end..).unwrap_or_default();
+                let rest = after.trim_start_matches('?').trim_start();
+                let at = doc.len() - rest.len();
+                about_from = match rest.chars().next() {
+                    Some(':') => Some(at + 1),
+                    Some('(') => Some(at),
+                    Some(',' | '}' | '|') => None,
+                    _ => return Err(format!("`{}` is followed by `{}`", &doc[i..end], rest.chars().take(12).collect::<String>())),
+                };
+                params.push(Param { name: &doc[i..end], optional: after.starts_with('?'), about: "", or, object: objects.saturating_sub(1) });
+                or = false;
+                expect_key = false;
+            }
+            c if in_object && expect_key && !c.is_whitespace() => return Err(format!("expected a key at `{}`", &doc[i..])),
+            _ => {}
+        }
+        prev = c;
+    }
+    Ok(params)
+}
+
 // ---------- param helpers ----------
 
 pub(crate) fn bad(cmd: &str, msg: impl Into<String>) -> EngineError {
diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index 7e12f609..fdbb68f9 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -30,8 +30,16 @@ pub fn specs() -> Vec<CommandSpec> {
             freeform
         ),
         cmd!(query "shape.sites", "Connection Sites", [], None, "{id} → [[x, y]] connection sites in slide points", has_slide, sites),
-        cmd!("shape.move", "Move", [], None, "{dx?, dy?: pt (relative) | x?, y?: pt (absolute), ids?}", has_selection, move_by),
-        cmd!("shape.resize", "Size", ["Shape Format", "Size"], None, "{w?, h?: pt, lockAspect?: bool, ids?}", has_selection, resize),
+        cmd!(
+            "shape.move",
+            "Move",
+            [],
+            None,
+            "{dx?: pt (relative), dy?: pt (relative), ids?} | {x?: pt (absolute), y?: pt (absolute), ids?}",
+            has_selection,
+            move_by
+        ),
+        cmd!("shape.resize", "Size", ["Shape Format", "Size"], None, "{w?: pt, h?: pt, lockAspect?: bool, ids?}", has_selection, resize),
         cmd!("shape.setBounds", "Position and Size", [], None, "{x, y, w, h, ids?}", has_selection, set_bounds),
         cmd!("shape.rotate", "Rotation", ["Shape Format", "Arrange", "Rotate"], None, "{deg?: absolute, by?: relative, ids?}", has_selection, rotate),
         cmd!("shape.flip", "Flip", ["Shape Format", "Arrange", "Rotate"], None, "{axis: horizontal|vertical, ids?}", has_selection, flip),
@@ -78,7 +86,15 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("shape.visible", "Show/Hide", ["Selection Pane"], None, "{visible?: bool, ids?}", has_selection, visible),
         cmd!("shape.lock", "Lock", [], None, "{locked?: bool, ids?}", has_selection, lock),
         cmd!("shape.setDefault", "Set as Default Shape", [], None, "{}", has_selection, set_default),
-        cmd!("picture.crop", "Crop", ["Picture Format", "Size"], None, "{left?, top?, right?, bottom?: fraction 0..1, ids?}", has_selection, crop),
+        cmd!(
+            "picture.crop",
+            "Crop",
+            ["Picture Format", "Size"],
+            None,
+            "{left?: fraction 0..1, top?: fraction 0..1, right?: fraction 0..1, bottom?: fraction 0..1, ids?}",
+            has_selection,
+            crop
+        ),
         cmd!(
             "picture.adjust",
             "Corrections",
diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index e9f6f164..e8abb05c 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -27,7 +27,15 @@ pub fn specs() -> Vec<CommandSpec> {
             s, p, "delCol"
         )),
         cmd!("table.merge", "Merge Cells", ["Table Layout", "Merge"], None, "{from: [r, c], to: [r, c], id?}", has_selection, merge),
-        cmd!("table.split", "Split Cells", ["Table Layout", "Merge"], None, "{cell: [r, c], id?}", has_selection, split),
+        cmd!(
+            "table.split",
+            "Split Cells",
+            ["Table Layout", "Merge"],
+            None,
+            "{cell?: [r, c] (else the edited cell), id?} | {row: index, col: index, id?}",
+            has_selection,
+            split
+        ),
         cmd!(
             "table.style",
             "Table Styles",
@@ -42,7 +50,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Table Style Options",
             ["Table Design", "Table Style Options"],
             None,
-            "{headerRow?, totalRow?, bandedRows?, firstColumn?, lastColumn?, bandedColumns?: bool, id?}",
+            "{headerRow?: bool, totalRow?: bool, bandedRows?: bool, firstColumn?: bool, lastColumn?: bool, bandedColumns?: bool, id?}",
             has_selection,
             options
         ),
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 48be3a51..30f86340 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -64,7 +64,7 @@ fn body_mut<'a>(doc: &'a mut Presentation, sel: &Selection, t: &TextSel) -> Opti
 
 /// Edit the active text body and selection; refits auto-sizing text boxes afterwards.
 pub(crate) fn edit_text<T>(s: &mut Session, f: impl FnOnce(&mut TextBody, &mut TextSel) -> T) -> Result<T> {
-    let t0 = s.doc()?.selection.text.clone().ok_or_else(|| bad("text", "no text insertion point"))?;
+    let t0 = s.doc()?.selection.text.clone().ok_or_else(|| bad("text", NO_TEXT_POINT))?;
     // Materialise an inherited placeholder box before editing (so autofit can change it).
     let r = s.edit(|doc, sel| {
         let mut t = t0.clone();
@@ -567,7 +567,7 @@ pub(crate) fn format_run(s: &mut Session, f: &(dyn Fn(&mut RunProps) + Send + Sy
     }
     let ids = st.selection.shapes.clone();
     if ids.is_empty() {
-        return Err(bad("format", "select text or a shape"));
+        return Err(bad("format", SELECT_TEXT_OR_SHAPE));
     }
     edit_shapes(s, &json!({"ids": ids}), "format", |sh| {
         match &mut sh.kind {
@@ -656,7 +656,7 @@ pub(crate) fn format_para(s: &mut Session, f: &(dyn Fn(&mut deckcraft_model::tex
     }
     let ids = st.selection.shapes.clone();
     if ids.is_empty() {
-        return Err(bad("format", "select text or a shape"));
+        return Err(bad("format", SELECT_TEXT_OR_SHAPE));
     }
     edit_shapes(s, &json!({"ids": ids}), "format", |sh| {
         match &mut sh.kind {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..55ca11bb 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -543,3 +543,55 @@ fn inserted_hyperlinks_look_like_links() {
     s.execute("format.underline", &json!({})).unwrap();
     assert_eq!(s.execute("format.state", &json!({})).unwrap()["underline"], false);
 }
+
+#[test]
+fn every_params_doc_names_its_keys() {
+    for c in command_specs() {
+        assert!(cmd::param_keys(c.params).is_ok(), "{}: {:?}", c.id, cmd::param_keys(c.params));
+    }
+    assert_eq!(cmd::param_keys("{index} | {id}").unwrap(), ["index", "id"]);
+    assert_eq!(cmd::param_keys("{color? | none?: true, kind?: a|b (x, y), ids?} → {id}").unwrap(), ["color", "none", "kind", "ids"]);
+}
+
+#[test]
+fn a_params_doc_spells_out_each_parameter() {
+    use cmd::Param;
+    let p = |name, optional, about, or, object| Param { name, optional, about, or, object };
+    assert_eq!(
+        cmd::parse_params("{preset: rect|roundRect, rect?: [x,y,w,h] pt, index? (else selected shapes)} → {id}").unwrap(),
+        [
+            p("preset", false, "rect|roundRect", false, 0),
+            p("rect", true, "[x,y,w,h] pt", false, 0),
+            p("index", true, "(else selected shapes)", false, 0)
+        ]
+    );
+    assert_eq!(
+        cmd::parse_params("{color? | none?: true, gradient?: {stops, kind?: a|b}, ids?}").unwrap(),
+        [
+            p("color", true, "", false, 0),
+            p("none", true, "true", true, 0),
+            p("gradient", true, "{stops, kind?: a|b}", false, 0),
+            p("ids", true, "", false, 0)
+        ]
+    );
+    assert_eq!(
+        cmd::parse_params("{name} | {major, minor}").unwrap(),
+        [p("name", false, "", false, 0), p("major", false, "", false, 1), p("minor", false, "", false, 1)]
+    );
+}
+
+#[test]
+fn what_a_command_acts_on_names_only_keys_it_takes() {
+    for c in command_specs() {
+        let keys = cmd::param_keys(c.params).unwrap();
+        let said = c.acts_on().unwrap_or_default();
+        assert!(!said.contains("`ids`") || keys.contains(&"ids"), "{}: {said}", c.id);
+        assert!(!said.contains("`id`") || keys.contains(&"id"), "{}: {said}", c.id);
+    }
+    let acts = |id: &str| find_command(id).and_then(|c| c.acts_on());
+    assert_eq!(acts("shape.resize").as_deref(), Some("Acts on the shapes in `ids`, else on the selected shapes."));
+    assert_eq!(acts("table.style").as_deref(), Some("Acts on the shape in `id`, else on the selected shapes."));
+    assert_eq!(acts("shape.setDefault").as_deref(), Some("Acts on the selected shapes."));
+    assert_eq!(acts("format.size").as_deref(), Some("Acts on the selected text or shapes."));
+    assert_eq!(acts("slide.new"), None);
+}
diff --git a/crates/mcp/src/server.rs b/crates/mcp/src/server.rs
index 576e0b4a..9316fa45 100644
--- a/crates/mcp/src/server.rs
+++ b/crates/mcp/src/server.rs
@@ -22,9 +22,10 @@ const INSTRUCTIONS: &str = "DeckCraft is a presentation app (a PowerPoint clone)
 current slide (y down; the default 16:9 slide is 960×540). Every action is a command: find ids and parameters with \
 list_commands and run them with run_command (or several with batch). Typical flow: new_presentation → add_slide \
 {layout:\"titleAndContent\", title, body} → add_shape / add_text_box / insert_picture / insert_chart → \
-inspect_slide to read back ids, boxes and text → render_slide to look at the result. Shapes are selected with \
-run_command edit.select {ids:[…]}; formatting commands (format.*, shape.fill, shape.line…) act on the selection or \
-on `ids`. Save with save_presentation (.deckcraft or .pptx).";
+inspect_slide to read back ids, boxes and text → render_slide to look at the result. Shape ids are looked up on the \
+current slide. An inserted shape is selected; run_command edit.select {ids:[…]} selects others. format.* acts on \
+the selected text or shapes; shape.fill, shape.line and the other commands whose parameters list `ids` act on \
+those shapes, else on the selected ones. Save with save_presentation (.deckcraft or .pptx).";
 
 /// Resource URIs.
 pub const DOC_URI: &str = "deckcraft://document";
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 449b7fc6..302ba345 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -12,7 +12,7 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 
 | Method | Params | What it does |
 |---|---|---|
-| `engine.execute` / `ui.menu.invoke` / `command` | `{command, params}` | Run any command (see `engine.commands`; `deckcraft-cli describe ID` documents one) |
+| `engine.execute` / `ui.menu.invoke` / `command` | `{command, params}` | Run any command (see `engine.commands`; `deckcraft-cli describe COMMAND` documents one) |
 | `engine.commands` | — | Every command: id, label, menu path, shortcut, params doc, enabled / disabled reason |
 | `document.inspect` | — | Slides, sections, layouts, shapes, selection |
 | `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, Home (start screen over the open presentations), slide show state, documents, perf (fps, render ms) |
@@ -29,4 +29,4 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `app.open` / `app.save` / `app.export` / `app.quit` | `{path, …}` | Files (export takes the `file.export` params, e.g. `{"path": "deck.pdf", "layout": "handouts", "perPage": 3}`) |
 
 The MCP server (`deckcraft-cli mcp`, see [mcp.md](mcp.md)) wraps the same methods for Claude
-and other agents; `deckcraft-cli app METHOD [JSON]` sends one request from a shell.
+and other agents; `deckcraft-cli app --method METHOD [PARAMS]` sends one request from a shell.
diff --git a/docs/mcp.md b/docs/mcp.md
index f7e24c7e..72cbd581 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -33,5 +33,5 @@ deck.
 Useful commands for building decks: `slide.new {layout, title, body}`, `shape.insert {preset,
 rect, text}`, `shape.connect {from, to, preset}`, `shape.freeform {points, closed, smooth}`,
 `shape.merge {op, ids}`, `format.*`, `design.theme`, `transition.set`, `animation.set`,
-`chart.*`, `table.*`, `file.export {path, layout}`. `deckcraft-cli describe ID` prints any
+`chart.*`, `table.*`, `file.export {path, layout}`. `deckcraft-cli describe COMMAND` prints any
 command's parameters.

From e3d98030699cd8838a6680d6b12e46f58ad0a309 Mon Sep 17 00:00:00 2001
From: Marco Arnulfo <marcoarnulfo1@gmail.com>
Date: Mon, 12 Oct 2026 23:11:56 +0200
Subject: [PATCH 057/376] macOS: end the process in on_exit so closing the
 window doesn't crash (fixes #279)

Same fix as storytold/gridcraft#117 (storytold/gridcraft#316): eframe drops
the window while AppKit's run loop still runs, AccessKit restores the
content view's class and AppKit's Touch Bar KVO observer throws on the
next display cycle. on_exit now ends the process on macOS once the
preferences are saved.
---
 apps/deckcraft/src/main.rs | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/apps/deckcraft/src/main.rs b/apps/deckcraft/src/main.rs
index 7b5e48bb..464377df 100644
--- a/apps/deckcraft/src/main.rs
+++ b/apps/deckcraft/src/main.rs
@@ -35,6 +35,16 @@ impl eframe::App for App {
     }
     fn on_exit(&mut self) {
         save_prefs(&self.0);
+        // macOS (#279): end the process here, before eframe tears the window down. AccessKit's
+        // macOS adapter subclasses the window's content view and restores its class on teardown;
+        // AppKit's Touch Bar support observes that view (KVO), so in the next display cycle
+        // `-[_NSTouchBarFinderObservation invalidate]` throws "not registered" and the quit ends
+        // in a crash report. eframe calls `on_exit` on every way of quitting (⌘Q, the close
+        // button, `app.quit`), once the unsaved-changes prompt has let the window close, and
+        // nothing after it is needed: the preferences are saved and the log file is unbuffered.
+        // `on_exit` only runs once the app exists, never on a failed start. Same as GridCraft #117.
+        #[cfg(target_os = "macos")]
+        std::process::exit(0);
     }
 }
 
@@ -228,3 +238,31 @@ fn main() -> eframe::Result {
         }),
     )
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// #279: on macOS the process ends inside `on_exit`, before eframe would tear the window down.
+    /// The check runs in a child (this test binary again), since on macOS it ends the process.
+    #[test]
+    fn on_exit_ends_the_process_on_macos() {
+        if std::env::var_os("DECKCRAFT_TEST_ON_EXIT").is_some() {
+            let mut app = App(SlideApp::new(Session::new(), Services::default()));
+            println!("calling on_exit");
+            eframe::App::on_exit(&mut app);
+            println!("on_exit returned");
+            return;
+        }
+        let out = std::process::Command::new(std::env::current_exe().unwrap())
+            .args(["--exact", "tests::on_exit_ends_the_process_on_macos", "--nocapture"])
+            .env("DECKCRAFT_TEST_ON_EXIT", "1")
+            .env("DECKCRAFT_NO_PREFS", "1")
+            .output()
+            .unwrap();
+        let stdout = String::from_utf8_lossy(&out.stdout);
+        assert!(out.status.success(), "{stdout}");
+        assert!(stdout.contains("calling on_exit"), "the child didn't run the test: {stdout}");
+        assert_eq!(stdout.contains("on_exit returned"), !cfg!(target_os = "macos"), "{stdout}");
+    }
+}

From 66f7e6e1ed3c6817cb208dfdcb1a899868cb2436 Mon Sep 17 00:00:00 2001
From: Yevhenii Hurin <evgeny.gurin@gmail.com>
Date: Tue, 13 Oct 2026 00:15:53 +0300
Subject: [PATCH 058/376] Self-review: no ID[=JSON] left, params grammar
 documented

A --cmd without a value now asks for COMMAND[=PARAMS]. The params field
says how describe reads it, table.split's row and col are optional as
the command reads them, and the MCP instructions name only shape
commands for `ids`.

[claude-opus-5-5] on behalf of hoblin
---
 apps/deckcraft-cli/src/help.rs | 2 +-
 apps/deckcraft-cli/src/main.rs | 2 +-
 crates/engine/src/cmd/mod.rs   | 6 +++++-
 crates/engine/src/cmd/table.rs | 2 +-
 crates/mcp/src/server.rs       | 2 +-
 5 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/apps/deckcraft-cli/src/help.rs b/apps/deckcraft-cli/src/help.rs
index 1b76001f..4245172a 100644
--- a/apps/deckcraft-cli/src/help.rs
+++ b/apps/deckcraft-cli/src/help.rs
@@ -147,7 +147,7 @@ A presentation is edited by running commands on it:
   deckcraft-cli run --cmd 'slide.new={{\"title\":\"Q3 results\"}}' --save q3.deckcraft
 
 `deckcraft-cli help SUBCOMMAND`, or `deckcraft-cli SUBCOMMAND --help`, explains one subcommand;
-`deckcraft-cli help run` explains commands.",
+`deckcraft-cli help run` explains how to write a command.",
         list.join("\n")
     )
 }
diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index 7b36288f..139b8e90 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -195,7 +195,7 @@ fn run(args: &[String]) -> Result<(), String> {
         match a.as_str() {
             "--in" => input = Some(it.next().cloned().ok_or("--in needs a file")?),
             "--sample" => sample = true,
-            "--cmd" => cmds.push(it.next().cloned().ok_or("--cmd needs ID[=JSON]")?),
+            "--cmd" => cmds.push(it.next().cloned().ok_or("--cmd needs COMMAND[=PARAMS]")?),
             "--save" => save = Some(it.next().cloned().ok_or("--save needs a path")?),
             "--export" => export = Some(it.next().cloned().ok_or("--export needs a path")?),
             "--print" => print = true,
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index 9cd8e4f1..58ad2407 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -33,6 +33,9 @@ pub struct CommandSpec {
     /// Where it lives: `["Home", "Font"]` (ribbon tab and group) or `["Arrange"]` (menu).
     pub menu: &'static [&'static str],
     pub shortcut: Option<&'static str>,
+    /// The parameters as `describe` and `commands` show them, read by [`parse_params`]: `?` marks
+    /// an optional key, a spaced ` | ` separates alternative sets of keys (so alternative values
+    /// are written unspaced, `ms|null`), `(…)` is a remark and `→` starts the answer.
     pub params: &'static str,
     pub enabled: Enabled,
     pub run: Run,
@@ -53,6 +56,7 @@ pub struct CommandInfo {
 }
 
 impl CommandSpec {
+    /// Holds because `Session::execute` skips the selection check when `id` or `ids` is given.
     pub fn acts_on(&self) -> Option<String> {
         let keys = param_keys(self.params).unwrap_or_default();
         let named = if keys.contains(&"ids") {
@@ -114,7 +118,7 @@ pub fn has_text(s: &Session) -> std::result::Result<(), String> {
     has_doc(s)?;
     if s.active().is_some_and(|d| d.selection.text.is_some()) { Ok(()) } else { Err(NO_TEXT_POINT.into()) }
 }
-/// Text editing or shapes with text selected (formatting commands apply to either).
+/// Text editing or selected shapes (formatting commands apply to either).
 pub fn has_text_or_shapes(s: &Session) -> std::result::Result<(), String> {
     has_doc(s)?;
     if s.active().is_some_and(|d| d.selection.text.is_some() || !d.selection.shapes.is_empty()) { Ok(()) } else { Err(SELECT_TEXT_OR_SHAPE.into()) }
diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index e8abb05c..ea5b2207 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -32,7 +32,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Split Cells",
             ["Table Layout", "Merge"],
             None,
-            "{cell?: [r, c] (else the edited cell), id?} | {row: index, col: index, id?}",
+            "{cell?: [r, c] (else the edited cell), id?} | {row?: index, col?: index, id?}",
             has_selection,
             split
         ),
diff --git a/crates/mcp/src/server.rs b/crates/mcp/src/server.rs
index 9316fa45..710067cd 100644
--- a/crates/mcp/src/server.rs
+++ b/crates/mcp/src/server.rs
@@ -24,7 +24,7 @@ list_commands and run them with run_command (or several with batch). Typical flo
 {layout:\"titleAndContent\", title, body} → add_shape / add_text_box / insert_picture / insert_chart → \
 inspect_slide to read back ids, boxes and text → render_slide to look at the result. Shape ids are looked up on the \
 current slide. An inserted shape is selected; run_command edit.select {ids:[…]} selects others. format.* acts on \
-the selected text or shapes; shape.fill, shape.line and the other commands whose parameters list `ids` act on \
+the selected text or shapes; shape.fill, shape.line and the other shape commands whose parameters list `ids` act on \
 those shapes, else on the selected ones. Save with save_presentation (.deckcraft or .pptx).";
 
 /// Resource URIs.

From 426fd71bd28beb318a760c24667fc7839f40f676 Mon Sep 17 00:00:00 2001
From: Yevhenii Hurin <evgeny.gurin@gmail.com>
Date: Tue, 13 Oct 2026 00:19:51 +0300
Subject: [PATCH 059/376] ROADMAP status line names the progress-log entry

[claude-opus-5-5] on behalf of hoblin
---
 ROADMAP.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 6b0be0fb..c33a06aa 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (progress log for 2026-10-12; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; before that: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere

From b97af97a58c513f15e6211b361cd814d5ce11388 Mon Sep 17 00:00:00 2001
From: xc4pr <88853037+xc4pr@users.noreply.github.com>
Date: Tue, 13 Oct 2026 00:39:17 +0200
Subject: [PATCH 060/376] Text: the caret shows on dark slides and in empty
 placeholders

The caret was always stroked black. On a dark slide (the Nocturne theme,
or any dark background with light text) it could not be seen. It is now
drawn in the colour that text typed at the caret takes, and falls back to
the theme token when that text has no fill.

An empty placeholder showed no caret at all: its body holds no paragraph
until something is typed, so the edit layout had no line for the caret to
stand on. The edit layout now treats such a body as one empty paragraph,
and the canvas leaves the placeholder's prompt out while it is being typed
into, so the caret does not sit inside "Click to add title".

Fixes #318.
---
 crates/engine/src/cmd/text.rs  | 27 +++++++++++++++++++-
 crates/engine/src/tests.rs     | 45 ++++++++++++++++++++++++++++++++++
 crates/ui-egui/src/canvas.rs   |  9 +++++--
 crates/ui-egui/src/textures.rs |  7 +++++-
 4 files changed, 84 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 48be3a51..2a430d93 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -4,7 +4,7 @@ use std::sync::Arc;
 
 use deckcraft_model::edit::{self as ed, Pos};
 use deckcraft_model::resolve::{self, Ctx};
-use deckcraft_model::text::{AutoFit, Hyperlink, Run, RunKind, RunProps, TextBody};
+use deckcraft_model::text::{AutoFit, Hyperlink, Paragraph, Run, RunKind, RunProps, TextBody};
 use deckcraft_model::{Presentation, ShapeId, ShapeKind};
 use serde_json::{Value, json};
 
@@ -133,6 +133,15 @@ pub fn layout_for(st: &DocState, t: &TextSel) -> Option<deckcraft_text::TextLayo
     }
     let sh = st.shape(t.shape)?;
     let body = sh.text.as_ref()?;
+    // A body nobody has typed into holds no paragraph. Lay it out as one empty paragraph, so
+    // the caret has a line to stand on.
+    let blank;
+    let body = if body.paragraphs.is_empty() {
+        blank = TextBody { paragraphs: vec![Paragraph::default()], ..body.clone() };
+        &blank
+    } else {
+        body
+    };
     let ctx = ctx_for(&st.doc, &st.selection)?;
     let x = xfrm_of(&st.doc, &st.selection, sh);
     let geo = deckcraft_render::shape_geometry(sh, x.w, x.h);
@@ -144,6 +153,22 @@ pub fn layout_for(st: &DocState, t: &TextSel) -> Option<deckcraft_text::TextLayo
     ))
 }
 
+/// The colour of text typed at the caret. The canvas draws the caret in it, so the caret shows
+/// wherever the text does: light on a dark slide, dark on a light one. `None` when that text
+/// has no fill to take a colour from.
+pub fn caret_color(st: &DocState, t: &TextSel) -> Option<deckcraft_color::Rgba> {
+    if t.notes || t.cell.is_some() {
+        return None;
+    }
+    let sh = st.shape(t.shape)?;
+    let body = sh.text.as_ref()?;
+    let ctx = ctx_for(&st.doc, &st.selection)?;
+    let blank = Paragraph::default();
+    let para = body.paragraphs.get(t.caret.0).unwrap_or(&blank);
+    let props = resolve::run(&ctx, sh, para, &ed::props_at(body, t.caret));
+    Some(resolve::text_color(&ctx, &props)).filter(|c| c.a > 0)
+}
+
 fn pos_param(p: &Value, key: &str) -> Option<Pos> {
     let a = p.get(key)?.as_array()?;
     Some((a.first()?.as_u64()? as usize, a.get(1)?.as_u64()? as usize))
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9aefd0b7..20122e6e 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -543,3 +543,48 @@ fn inserted_hyperlinks_look_like_links() {
     s.execute("format.underline", &json!({})).unwrap();
     assert_eq!(s.execute("format.state", &json!({})).unwrap()["underline"], false);
 }
+
+#[test]
+fn an_empty_placeholder_has_a_caret() {
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+    s.execute("text.edit", &json!({"id": title})).unwrap();
+    let st = s.doc().unwrap();
+    let sel = st.selection.text.clone().unwrap();
+    let layout = cmd::text::layout_for(st, &sel).unwrap();
+    let (x, top, bottom) = layout.caret(deckcraft_text::Pos { para: 0, ch: 0 }).expect("a caret in the empty title");
+    // A centred title: the caret stands in the middle of the text box, one line tall.
+    assert!((x - layout.inner.center().x).abs() < 1.0, "{x} in {:?}", layout.inner);
+    assert!(bottom - top > 20.0, "{top}..{bottom}");
+}
+
+#[test]
+fn the_caret_takes_the_colour_of_the_text() {
+    let caret = |theme: &str| {
+        let mut s = session();
+        s.execute("design.theme", &json!({"name": theme})).unwrap();
+        let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+        s.execute("text.edit", &json!({"id": title})).unwrap();
+        let st = s.doc().unwrap();
+        let empty = cmd::text::caret_color(st, &st.selection.text.clone().unwrap()).unwrap();
+        s.execute("text.insert", &json!({"text": "Typed"})).unwrap();
+        let st = s.doc().unwrap();
+        assert_eq!(cmd::text::caret_color(st, &st.selection.text.clone().unwrap()), Some(empty));
+        empty
+    };
+    // Dark text on the light theme, light text on the dark one: never black on a dark slide.
+    let (light, dark) = (caret("DeckCraft"), caret("Nocturne"));
+    assert!(light.r < 0x60 && light.g < 0x60 && light.b < 0x60, "{light:?}");
+    assert!(dark.r > 0xC0 && dark.g > 0xC0 && dark.b > 0xC0, "{dark:?}");
+    // Text set to red gets a red caret.
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+    s.execute("text.edit", &json!({"id": title})).unwrap();
+    s.execute("text.insert", &json!({"text": "Red"})).unwrap();
+    s.execute("text.selectAll", &json!({})).unwrap();
+    s.execute("format.color", &json!({"color": "#FF0000"})).unwrap();
+    s.execute("text.move", &json!({"to": "end"})).unwrap();
+    let st = s.doc().unwrap();
+    let red = cmd::text::caret_color(st, &st.selection.text.clone().unwrap()).unwrap();
+    assert_eq!((red.r, red.g, red.b), (0xFF, 0, 0));
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index d267f76c..509cd5fc 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -112,7 +112,10 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
         Some((Target::Slides, d)) => {
             let idx = d.selection.slide;
             let doc = d.doc.clone();
-            app.textures.slide(ui.ctx(), &doc, idx, px, true, crate::media::gif_key(&gifs), app.ui.grayscale, &times)
+            // A placeholder's prompt makes way for the caret once it is being typed into.
+            let typing_into = d.selection.text.as_ref().filter(|t| !t.notes && t.cell.is_none()).map(|t| t.shape);
+            let no_prompt = typing_into.filter(|id| d.shape(*id).and_then(|sh| sh.text.as_ref()).is_none_or(|body| body.is_empty()));
+            app.textures.slide(ui.ctx(), &doc, idx, px, true, crate::media::gif_key(&gifs), app.ui.grayscale, &times, no_prompt)
         }
         Some((Target::Master { master }, d)) => master_tex(ui.ctx(), &d.doc, master, None, px),
         Some((Target::Layout { master, layout }, d)) => master_tex(ui.ctx(), &d.doc, master, Some(layout), px),
@@ -427,7 +430,9 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
             ui.ctx().request_repaint_after(std::time::Duration::from_millis(300));
             if blink && let Some((cx, top, bot)) = l.caret(deckcraft_text::Pos { para: ts.caret.0, ch: ts.caret.1 }) {
                 let (p0, p1) = (xf.to_screen(m * Point::new(cx, top)), xf.to_screen(m * Point::new(cx, bot)));
-                painter.line_segment([p0, p1], Stroke::new(1.5, t.caret));
+                // In the colour of the text being typed: a black caret is lost on a dark slide.
+                let color = deckcraft_engine::cmd::text::caret_color(st, ts).map_or(t.caret, theme::to_color32);
+                painter.line_segment([p0, p1], Stroke::new(1.5, color));
             }
         }
     }
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index 84cf2755..d93a5f2a 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -15,6 +15,7 @@ struct Key {
     size: (u32, u32),
     edit: bool,
     extra: u64,
+    skip_text: Option<ShapeId>,
 }
 
 struct Entry {
@@ -61,6 +62,7 @@ fn threads() -> u16 {
 
 impl Textures {
     /// The canvas texture for slide `index` at `size` pixels; `extra` changes with the GIF frames.
+    /// `skip_text` leaves out one shape's text (the prompt of a placeholder being typed into).
     pub fn slide(
         &mut self,
         ctx: &egui::Context,
@@ -71,6 +73,7 @@ impl Textures {
         extra: u64,
         grayscale: bool,
         gif_times: &[(ShapeId, f64)],
+        skip_text: Option<ShapeId>,
     ) -> Option<TextureHandle> {
         let slide = p.slides.get(index)?.clone();
         let master = master_of(p, &slide);
@@ -80,6 +83,7 @@ impl Textures {
             size,
             edit,
             extra: extra ^ grayscale as u64,
+            skip_text,
         };
         if let Some(e) = &self.canvas
             && e.key == key
@@ -88,7 +92,7 @@ impl Textures {
         }
         let t0 = crate::now_ms();
         let scale = size.0 as f64 / p.slide_size.width.max(1.0);
-        let opts = RenderOpts { scale, edit, gif_times, threads: threads(), size: Some(size), ..Default::default() };
+        let opts = RenderOpts { scale, edit, gif_times, skip_text, threads: threads(), size: Some(size), ..Default::default() };
         let img = deckcraft_render::render_slide(p, index, &opts);
         self.last_render_ms = crate::now_ms() - t0;
         let ci = to_color_image(&img, grayscale);
@@ -121,6 +125,7 @@ impl Textures {
             size: (width_px, h),
             edit: false,
             extra: 0,
+            skip_text: None,
         };
         self.clock += 1;
         let clock = self.clock;

From e6a41d1ada131b415d5a46b78dda1ec16d2ddf40 Mon Sep 17 00:00:00 2001
From: Marco Arnulfo <marcoarnulfo1@gmail.com>
Date: Tue, 13 Oct 2026 06:03:42 +0200
Subject: [PATCH 061/376] Review: the Language dialog marks the selected text
 with the language you pick (fixes #339)

---
 crates/engine/src/cmd/format.rs | 18 ++++++++++++++++
 crates/engine/src/tests.rs      | 14 +++++++++++++
 crates/ui-egui/src/dialogs.rs   | 37 +++++++++++++++++++++------------
 crates/ui-egui/src/lib.rs       | 29 ++++++++++++++++++++++++++
 4 files changed, 85 insertions(+), 13 deletions(-)

diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index c68d1242..1b9aee83 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -59,6 +59,15 @@ pub fn specs() -> Vec<CommandSpec> {
             case
         ),
         cmd!("format.caps", "Caps", [], None, "{caps: none|small|all}", has_text_or_shapes, caps),
+        cmd!(
+            "format.language",
+            "Language",
+            ["Review", "Language"],
+            None,
+            "{lang: BCP 47 tag (en-US, fr-FR…)} — the proofing language of the selected text",
+            has_text_or_shapes,
+            language
+        ),
         cmd!(
             "format.spacing",
             "Character Spacing",
@@ -297,6 +306,14 @@ fn highlight(s: &mut Session, p: &Value) -> Result<Value> {
     let c = color_param(p, "color");
     format_run(s, &move |r| r.highlight = c.clone())
 }
+fn language(s: &mut Session, p: &Value) -> Result<Value> {
+    let l = str_param(p, "lang")
+        .map(str::trim)
+        .filter(|l| !l.is_empty() && l.len() <= 35)
+        .ok_or_else(|| bad("format.language", "missing or invalid `lang`"))?
+        .to_string();
+    format_run(s, &move |r| r.lang = Some(l.clone()))
+}
 fn caps(s: &mut Session, p: &Value) -> Result<Value> {
     let c = match str_param(p, "caps").unwrap_or("none") {
         "small" => Caps::Small,
@@ -678,6 +695,7 @@ fn state(s: &mut Session, _p: &Value) -> Result<Value> {
         "align": pp.align.map(|a| a.xml()),
         "bullets": matches!(pp.bullet, Some(Bullet::Char { .. })),
         "numbering": matches!(pp.bullet, Some(Bullet::AutoNum { .. })),
+        "lang": r.lang,
         "lineSpacing": serde_json::to_value(pp.line_spacing).unwrap_or_default(),
         "painter": s.painter.is_some(),
     }))
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..ad87d48f 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,17 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn format_language_marks_the_selected_text() {
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+    s.execute("text.edit", &json!({"id": title})).unwrap();
+    s.execute("text.insert", &json!({"text": "Hola mundo"})).unwrap();
+    s.execute("text.move", &json!({"to": "wordLeft", "extend": true})).unwrap();
+    s.execute("format.language", &json!({"lang": "es-ES"})).unwrap();
+    assert_eq!(s.execute("format.state", &json!({})).unwrap()["lang"], "es-ES");
+    let body = s.doc().unwrap().current_slide().unwrap().shapes[0].text.clone().unwrap();
+    let langs: Vec<_> = body.paragraphs[0].runs.iter().map(|r| (r.text.as_str(), r.props.lang.as_deref())).collect();
+    assert_eq!(langs, vec![("Hola ", None), ("mundo", Some("es-ES"))]);
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..74ec0c91 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -556,21 +556,32 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
         }
         "language" => {
             ui.label("Mark selected text as:");
-            for l in [
-                "English (United States)",
-                "English (United Kingdom)",
-                "Español",
-                "Français",
-                "Deutsch",
-                "Italiano",
-                "Português",
-                "日本語",
-                "中文",
-                "العربية",
-            ] {
-                let _ = ui.selectable_label(l.starts_with("English (United States)"), l);
+            if !d.fields.contains_key("lang") {
+                let cur = app.session.execute("format.state", &json!({})).ok().and_then(|v| v.get("lang").and_then(Value::as_str).map(String::from));
+                d.fields.insert("lang".into(), cur.unwrap_or_else(|| "en-US".into()));
             }
+            let mut lang = d.get("lang", "en-US");
+            for (tag, name) in [
+                ("en-US", "English (United States)"),
+                ("en-GB", "English (United Kingdom)"),
+                ("es-ES", "Español"),
+                ("fr-FR", "Français"),
+                ("de-DE", "Deutsch"),
+                ("it-IT", "Italiano"),
+                ("pt-PT", "Português"),
+                ("ja-JP", "日本語"),
+                ("zh-CN", "中文"),
+                ("ar-SA", "العربية"),
+            ] {
+                if ui.selectable_label(lang.eq_ignore_ascii_case(tag), name).clicked() {
+                    lang = tag.to_string();
+                }
+            }
+            d.fields.insert("lang".into(), lang.clone());
             let (ok, cancel) = buttons(ui, "OK");
+            if ok {
+                run(app, "format.language", json!({"lang": lang}));
+            }
             ok || cancel
         }
         "customShow" => {
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..19b7aec9 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1408,4 +1408,33 @@ mod tests {
         harness.run_steps(3);
         assert_eq!(harness.state().textures.canvas_renders, n, "an unchanged slide isn't rendered again");
     }
+
+    /// #339: clicking a language in Review > Language did nothing, and OK didn't mark the text.
+    #[test]
+    fn the_language_dialog_marks_the_selected_text() {
+        use egui_kittest::kittest::Queryable;
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        let title = harness.state().session.active().unwrap().doc.slides[0].shapes[0].id.0;
+        harness.state_mut().session.execute("text.edit", &json!({"id": title})).unwrap();
+        harness.state_mut().session.execute("text.insert", &json!({"text": "Bonjour"})).unwrap();
+        harness.state_mut().session.execute("text.selectAll", &json!({})).unwrap();
+        harness.state_mut().run("app.dialog", json!({"id": "language"})).unwrap();
+        // The anchored window settles over its first frames; click once it stays put.
+        harness.run_steps(4);
+        harness.get_by_label("Français").click();
+        harness.run_steps(2);
+        harness.get_by_label("OK").click();
+        harness.run_steps(2);
+        assert!(harness.state().dialog.is_none());
+        let d = harness.state().session.active().unwrap();
+        let body = d.doc.slides[0].shapes[0].text.as_ref().unwrap();
+        assert_eq!(body.paragraphs[0].runs[0].props.lang.as_deref(), Some("fr-FR"));
+    }
 }

From 180cb4f36f81e959d640d0f9f024cc905b0ef0f8 Mon Sep 17 00:00:00 2001
From: dotCooCoo <RobertLeeLW@gmail.com>
Date: Mon, 12 Oct 2026 21:34:36 -0700
Subject: [PATCH 062/376] Fonts: the font scan leaves out faces with no outline
 tables

The font scan also listed faces with none of the tables skrifa reads
glyph outlines from (glyf, CFF, CFF2, VARC): faces whose glyphs are
bitmaps only or are stored as outlines in Apple's hvgl table.
FontDb::outline, which the renderer reads glyph outlines from, returns
an empty path for every glyph of such a face. On macOS 27.0.1 the scan
lists "GB18030 Bitmap" (/System/Library/Fonts/Supplemental/NISC18030.ttf),
which stores its glyphs as bitmaps (bdat) and has no color glyph
tables, so the renderer draws none of the 27,544 characters it maps.

file_face_names now leaves out a face whose table directory has none of
those tables, as vectorcraft's font scan does (storytold/vectorcraft#781).
---
 crates/fonts/src/fontdb.rs | 10 ++++++++++
 crates/fonts/src/lib.rs    | 30 ++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/crates/fonts/src/fontdb.rs b/crates/fonts/src/fontdb.rs
index 31cb9a18..9fe32e46 100644
--- a/crates/fonts/src/fontdb.rs
+++ b/crates/fonts/src/fontdb.rs
@@ -382,9 +382,16 @@ fn legacy_names(f: &skrifa::FontRef<'_>, family: &str) -> Option<(String, String
     Some((legacy, name(f, &[StringId::SUBFAMILY_NAME]).unwrap_or_else(|| "Regular".into())))
 }
 
+/// The tables skrifa reads glyph outlines from: `glyf` (TrueType), `CFF `, `CFF2` and `VARC`. For a
+/// face with none of them (bitmaps only, or outlines in Apple's `hvgl` table), [`FontDb::outline`]
+/// returns an empty path for every glyph.
+#[cfg(not(target_arch = "wasm32"))]
+const OUTLINE_TABLES: [&[u8; 4]; 4] = [b"glyf", b"CFF ", b"CFF2", b"VARC"];
+
 /// (family, style) of every face in the font file at `path`, reading only its table directories
 /// and `name` tables: a scan opens hundreds of font files, many of them megabytes long. A
 /// variable font is cataloged under its default style; its named instances appear once it loads.
+/// Faces with none of the [`OUTLINE_TABLES`] are left out.
 #[cfg(not(target_arch = "wasm32"))]
 fn file_face_names(path: &std::path::Path) -> Vec<(String, String)> {
     use std::io::{Read, Seek, SeekFrom};
@@ -413,6 +420,9 @@ fn file_face_names(path: &std::path::Path) -> Vec<(String, String)> {
             let dir = read_at(start.into(), 12)?;
             let tables = u16::from_be_bytes(dir.get(4..6)?.try_into().ok()?) as usize;
             let records = read_at(u64::from(start) + 12, tables * 16)?;
+            if !records.as_chunks::<16>().0.iter().any(|r| OUTLINE_TABLES.iter().any(|t| r.starts_with(*t))) {
+                return None;
+            }
             let rec = records.as_chunks::<16>().0.iter().find(|r| r.starts_with(b"name"))?;
             let (offset, len) = (be32(rec, 8)?, be32(rec, 12)?);
             if len > MAX_NAME_TABLE {
diff --git a/crates/fonts/src/lib.rs b/crates/fonts/src/lib.rs
index 16be2ca5..9b727530 100644
--- a/crates/fonts/src/lib.rs
+++ b/crates/fonts/src/lib.rs
@@ -220,6 +220,36 @@ mod tests {
         }
     }
 
+    #[test]
+    fn faces_without_outlines_are_not_cataloged() {
+        // Rename the Semibold's `glyf` table, as in fonts whose glyphs are bitmaps or are stored in
+        // Apple's `hvgl` table. The face still maps "A", but its outline is empty. The new tag
+        // keeps the table directory sorted.
+        let mut semibold = include_bytes!("../tests/fixtures/legacy-semibold.ttf").to_vec();
+        let tables = u16::from_be_bytes([semibold[4], semibold[5]]) as usize;
+        let glyf = (0..tables).map(|i| 12 + 16 * i).find(|&r| &semibold[r..r + 4] == b"glyf").unwrap();
+        semibold[glyf..glyf + 4].copy_from_slice(b"gxyz");
+        let loaded = FontDb::with_font_dirs(Vec::new());
+        assert_eq!(loaded.add_font(semibold.clone()), 1);
+        let face = loaded.face("DeckCraft Legacy", "Semibold");
+        assert!(face.covers('A'));
+        assert!(loaded.outline(&face, face.glyph_for('A')).elements().is_empty());
+        // The system font scan lists the Regular, which has outlines, and leaves out the Semibold
+        // under both of its names.
+        #[cfg(not(target_arch = "wasm32"))]
+        {
+            let dir = std::env::temp_dir().join(format!("deckcraft-fonts-outlines-{}", std::process::id()));
+            std::fs::create_dir_all(&dir).unwrap();
+            std::fs::write(dir.join("legacy-semibold.ttf"), &semibold).unwrap();
+            std::fs::write(dir.join("legacy-regular.ttf"), include_bytes!("../tests/fixtures/legacy-regular.ttf")).unwrap();
+            let db = FontDb::with_font_dirs(vec![dir.clone()]);
+            db.set_system_fallback(false);
+            assert_eq!(db.styles("DeckCraft Legacy"), ["Regular"]);
+            assert!(!db.has_family("DeckCraft Legacy Semibold"));
+            let _ = std::fs::remove_dir_all(&dir);
+        }
+    }
+
     #[test]
     fn missing_document_fonts_are_drawn_in_calibri() {
         // PowerPoint draws a missing family in Calibri, whatever its panose or the theme says.

From 85345aaa1360c49a22fc968b4cac951608b3e6be Mon Sep 17 00:00:00 2001
From: Marco Arnulfo <marcoarnulfo1@gmail.com>
Date: Tue, 13 Oct 2026 06:44:47 +0200
Subject: [PATCH 063/376] Open: a password-protected presentation says so, and
 open errors show on the start screen (part of #346)

---
 crates/engine/src/cmd/file.rs         |   3 +
 crates/pptx/src/cfb.rs                | 185 ++++++++++++++++++++++++++
 crates/pptx/src/lib.rs                |   6 +
 crates/ui-egui/src/backstage.rs       |   2 +-
 crates/ui-egui/src/backstage_tests.rs |  19 +++
 crates/ui-egui/src/lib.rs             |  18 ++-
 6 files changed, 228 insertions(+), 5 deletions(-)
 create mode 100644 crates/pptx/src/cfb.rs

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..372fe966 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -73,6 +73,9 @@ pub fn open_presentation(name: &str, bytes: &[u8]) -> Result<Presentation> {
         deckcraft_format::repair(&mut p);
         return Ok(p);
     }
+    if deckcraft_pptx::is_encrypted(bytes) {
+        return Err(EngineError::Other(format!("{name} is password-protected. DeckCraft can't open password-protected presentations yet.")));
+    }
     let lower = name.to_ascii_lowercase();
     if lower.ends_with(".txt") || lower.ends_with(".md") {
         let text = String::from_utf8_lossy(bytes);
diff --git a/crates/pptx/src/cfb.rs b/crates/pptx/src/cfb.rs
new file mode 100644
index 00000000..3155d192
--- /dev/null
+++ b/crates/pptx/src/cfb.rs
@@ -0,0 +1,185 @@
+//! Just enough of the Compound File Binary (CFB/OLE2) container to tell a password-protected
+//! presentation apart: PowerPoint wraps an encrypted `.pptx` in a CFB holding `EncryptionInfo`
+//! and `EncryptedPackage` streams (ECMA-376 / [MS-OFFCRYPTO]) instead of a zip. Every read is
+//! bounds-checked and every loop bounded. Copied from GridCraft's `crates/xlsx/src/cfb.rs`.
+
+/// The CFB signature at the start of the file.
+const SIGNATURE: [u8; 8] = [0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1];
+
+const END_OF_CHAIN: u32 = 0xFFFF_FFFE;
+/// Sector ids at or above this are markers (free, end of chain, FAT/DIFAT sector), not sectors.
+const MAX_REG_SECT: u32 = 0xFFFF_FFFA;
+/// Directory sectors followed at most (4096 entries with 512-byte sectors).
+const MAX_DIR_SECTORS: usize = 1024;
+/// DIFAT sectors followed at most.
+const MAX_DIFAT_SECTORS: usize = 1024;
+
+/// Stream names that mark an encrypted (password-protected) OOXML package.
+const ENCRYPTED_STREAMS: [&str; 2] = ["EncryptedPackage", "EncryptionInfo"];
+
+fn u16_at(b: &[u8], at: usize) -> Option<u16> {
+    let s = b.get(at..at.checked_add(2)?)?;
+    Some(u16::from_le_bytes([*s.first()?, *s.get(1)?]))
+}
+
+fn u32_at(b: &[u8], at: usize) -> Option<u32> {
+    let s = b.get(at..at.checked_add(4)?)?;
+    Some(u32::from_le_bytes([*s.first()?, *s.get(1)?, *s.get(2)?, *s.get(3)?]))
+}
+
+/// Whether `bytes` is a compound file holding an encryption stream. Walks the directory through
+/// the FAT; when the structure can't be followed (truncated or malformed), falls back to scanning
+/// the bytes for the UTF-16LE stream names.
+pub(crate) fn is_encrypted(bytes: &[u8]) -> bool {
+    if !bytes.starts_with(&SIGNATURE) {
+        return false;
+    }
+    match directory_names(bytes) {
+        Some(names) => names.iter().any(|n| ENCRYPTED_STREAMS.iter().any(|e| n.eq_ignore_ascii_case(e))),
+        None => ENCRYPTED_STREAMS.iter().any(|e| contains_utf16(bytes, e)),
+    }
+}
+
+fn contains_utf16(hay: &[u8], needle: &str) -> bool {
+    let n: Vec<u8> = needle.encode_utf16().flat_map(u16::to_le_bytes).collect();
+    !n.is_empty() && hay.windows(n.len()).any(|w| w == n.as_slice())
+}
+
+/// Names of every directory entry, or `None` when the directory can't be read.
+fn directory_names(b: &[u8]) -> Option<Vec<String>> {
+    if !b.starts_with(&SIGNATURE) {
+        return None;
+    }
+    let shift = u16_at(b, 30)?;
+    if shift != 9 && shift != 12 {
+        return None;
+    }
+    let size = 1usize << shift;
+    let per = size / 4;
+    let sector = |id: u32| -> Option<&[u8]> {
+        let start = (id as usize).checked_add(1)?.checked_mul(size)?;
+        b.get(start..start.checked_add(size)?)
+    };
+    // The DIFAT: the FAT's sector ids, 109 in the header then chained DIFAT sectors.
+    let mut difat: Vec<u32> = (0..109).filter_map(|i| u32_at(b, 76 + i * 4)).filter(|&s| s < MAX_REG_SECT).collect();
+    let mut next = u32_at(b, 68)?;
+    for _ in 0..MAX_DIFAT_SECTORS {
+        if next >= MAX_REG_SECT {
+            break;
+        }
+        let s = sector(next)?;
+        difat.extend((0..per - 1).filter_map(|i| u32_at(s, i * 4)).filter(|&x| x < MAX_REG_SECT));
+        next = u32_at(s, (per - 1) * 4)?;
+    }
+    let fat_next = |id: u32| -> Option<u32> {
+        let idx = id as usize;
+        let fat_sector = *difat.get(idx / per)?;
+        u32_at(sector(fat_sector)?, (idx % per) * 4)
+    };
+    let mut names = Vec::new();
+    let mut id = u32_at(b, 48)?;
+    for _ in 0..MAX_DIR_SECTORS {
+        if id == END_OF_CHAIN {
+            return Some(names);
+        }
+        if id >= MAX_REG_SECT {
+            return None;
+        }
+        let s = sector(id)?;
+        for e in s.as_chunks::<128>().0 {
+            let len = usize::from(u16_at(e, 64)?);
+            if !(2..=64).contains(&len) {
+                continue;
+            }
+            let units: Vec<u16> = (0..(len - 2) / 2).filter_map(|i| u16_at(e, i * 2)).collect();
+            names.push(String::from_utf16_lossy(&units));
+        }
+        id = fat_next(id)?;
+    }
+    // A directory longer than the bound (or a cyclic chain): report what was read.
+    Some(names)
+}
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used)]
+
+    use super::*;
+
+    /// A minimal valid compound file (512-byte sectors: FAT at sector 0, directory at sector 1)
+    /// whose directory holds a root entry plus the given stream names.
+    fn build(streams: &[&str]) -> Vec<u8> {
+        let mut b = vec![0u8; 512 * 3];
+        b[..8].copy_from_slice(&SIGNATURE);
+        b[24..26].copy_from_slice(&0x3Eu16.to_le_bytes()); // minor version
+        b[26..28].copy_from_slice(&3u16.to_le_bytes()); // major version
+        b[28..30].copy_from_slice(&0xFFFEu16.to_le_bytes()); // byte order
+        b[30..32].copy_from_slice(&9u16.to_le_bytes()); // sector shift
+        b[32..34].copy_from_slice(&6u16.to_le_bytes()); // mini sector shift
+        b[44..48].copy_from_slice(&1u32.to_le_bytes()); // FAT sectors
+        b[48..52].copy_from_slice(&1u32.to_le_bytes()); // first directory sector
+        b[60..64].copy_from_slice(&END_OF_CHAIN.to_le_bytes()); // no mini FAT
+        b[68..72].copy_from_slice(&END_OF_CHAIN.to_le_bytes()); // no DIFAT sectors
+        for i in 0..109 {
+            b[76 + i * 4..80 + i * 4].copy_from_slice(&0xFFFF_FFFFu32.to_le_bytes());
+        }
+        b[76..80].copy_from_slice(&0u32.to_le_bytes()); // FAT lives in sector 0
+        // FAT (sector 0, at byte 512): sector 0 is a FAT sector, sector 1 ends its chain.
+        for i in 0..128 {
+            b[512 + i * 4..516 + i * 4].copy_from_slice(&0xFFFF_FFFFu32.to_le_bytes());
+        }
+        b[512..516].copy_from_slice(&0xFFFF_FFFDu32.to_le_bytes());
+        b[516..520].copy_from_slice(&END_OF_CHAIN.to_le_bytes());
+        // Directory (sector 1, at byte 1024).
+        for (k, name) in std::iter::once("Root Entry").chain(streams.iter().copied()).take(4).enumerate() {
+            let e = 1024 + k * 128;
+            let units: Vec<u16> = name.encode_utf16().take(31).collect();
+            for (i, u) in units.iter().enumerate() {
+                b[e + i * 2..e + i * 2 + 2].copy_from_slice(&u.to_le_bytes());
+            }
+            b[e + 64..e + 66].copy_from_slice(&((units.len() as u16 + 1) * 2).to_le_bytes());
+            b[e + 66] = if k == 0 { 5 } else { 2 };
+        }
+        b
+    }
+
+    #[test]
+    fn reads_directory_names() {
+        let b = build(&["EncryptionInfo", "EncryptedPackage"]);
+        assert_eq!(directory_names(&b), Some(vec!["Root Entry".into(), "EncryptionInfo".into(), "EncryptedPackage".into()]));
+        assert!(is_encrypted(&b));
+        // A PowerPoint 97-2003 .ppt is a compound file too, without the encryption streams.
+        assert!(!is_encrypted(&build(&["PowerPoint Document", "Current User"])));
+        assert!(!is_encrypted(b"PK\x03\x04"));
+    }
+
+    #[test]
+    fn hostile_headers_never_panic() {
+        let mut b = build(&["PowerPoint Document"]);
+        for at in [30usize, 48, 68, 76, 512, 516, 1024 + 64] {
+            for v in [0u32, 1, 7, 0xFFFF_FFFA, 0xFFFF_FFFF, 0x7FFF_FFFF] {
+                let mut c = b.clone();
+                c[at..at + 4].copy_from_slice(&v.to_le_bytes());
+                let _ = is_encrypted(&c);
+                for cut in [0usize, 8, 100, 600, 1100] {
+                    let _ = is_encrypted(&c[..cut.min(c.len())]);
+                }
+            }
+        }
+        // A directory chain that loops back on itself stops at the bound.
+        b[516..520].copy_from_slice(&1u32.to_le_bytes());
+        assert!(!is_encrypted(&b));
+    }
+
+    /// #346: opening a password-protected presentation says so instead of failing as an unknown
+    /// file.
+    #[test]
+    fn a_password_protected_presentation_is_named_as_such() {
+        let locked = build(&["EncryptionInfo", "EncryptedPackage"]);
+        let err = deckcraft_engine::cmd::file::open_presentation("Locked.pptx", &locked).unwrap_err().to_string();
+        assert!(err.contains("Locked.pptx is password-protected"), "{err}");
+        let ppt = build(&["PowerPoint Document", "Current User"]);
+        let err = deckcraft_engine::cmd::file::open_presentation("Old.ppt", &ppt).unwrap_err().to_string();
+        assert!(!err.contains("password"), "{err}");
+    }
+}
diff --git a/crates/pptx/src/lib.rs b/crates/pptx/src/lib.rs
index 92274b62..c720b539 100644
--- a/crates/pptx/src/lib.rs
+++ b/crates/pptx/src/lib.rs
@@ -7,6 +7,7 @@
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
 
+mod cfb;
 mod custgeom;
 mod maps;
 mod opc;
@@ -44,6 +45,11 @@ pub fn sniff(bytes: &[u8]) -> bool {
     zip::ZipArchive::new(std::io::Cursor::new(bytes)).map(|z| z.index_for_name("[Content_Types].xml").is_some()).unwrap_or(false)
 }
 
+/// Is this a password-protected presentation (an encrypted package inside a compound file)?
+pub fn is_encrypted(bytes: &[u8]) -> bool {
+    cfb::is_encrypted(bytes)
+}
+
 /// Read a `.pptx` / `.potx` / `.ppsx` package.
 pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
     read::import(bytes)
diff --git a/crates/ui-egui/src/backstage.rs b/crates/ui-egui/src/backstage.rs
index f1d0fde3..b5711be4 100644
--- a/crates/ui-egui/src/backstage.rs
+++ b/crates/ui-egui/src/backstage.rs
@@ -571,7 +571,7 @@ fn recent_list(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize) {
         if resp.on_hover_text(&path).clicked()
             && let Err(e) = app.open_path(&path)
         {
-            app.set_status(e);
+            app.notify(e);
         }
     }
 }
diff --git a/crates/ui-egui/src/backstage_tests.rs b/crates/ui-egui/src/backstage_tests.rs
index 115d782f..bb5edb53 100644
--- a/crates/ui-egui/src/backstage_tests.rs
+++ b/crates/ui-egui/src/backstage_tests.rs
@@ -368,6 +368,25 @@ fn the_start_screen_is_file_home() {
     assert!(h.state().backstage.is_none());
 }
 
+/// #346: a file picked in Open that can't be read used to drop back to the start screen without
+/// a word. The reason now shows over the start screen.
+#[test]
+fn a_file_that_cant_be_opened_says_why() {
+    let dir = temp_dir("unreadable");
+    let path = dir.join("Notes.pptx");
+    std::fs::write(&path, b"not a presentation").unwrap();
+    let picked = path.to_string_lossy().to_string();
+    let services = Services { pick_open: Some(Box::new(move |_: &str| Some(picked.clone()))), ..Default::default() };
+    let mut h = harness(SlideApp::new(Session::new(), services));
+    h.state_mut().run("app.backstage", json!({"page": "open"})).unwrap();
+    h.run_steps(2);
+    h.get_by_label("Browse").click();
+    h.run_steps(3);
+    assert!(h.state().session.documents().is_empty());
+    assert!(h.query_by_label_contains("not a presentation DeckCraft can read").is_some(), "the error is on screen");
+    let _ = std::fs::remove_dir_all(&dir);
+}
+
 /// Print previews the pages its settings make and prints through a PDF opened in the system
 /// viewer.
 #[test]
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..6ca64a9f 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -279,6 +279,12 @@ impl SlideApp {
         self.status = Some((msg.into(), now_ms()));
     }
 
+    /// A message that must be seen wherever the user is: a toast, which also shows over the start
+    /// screen and the File tab, where there is no status bar.
+    pub fn notify(&mut self, msg: impl Into<String>) {
+        self.toast = Some(toast::Toast { text: msg.into(), at: now_ms() });
+    }
+
     /// Run a command by id (UI commands here, everything else in the engine). Errors show in the
     /// status bar and are returned.
     pub fn run(&mut self, id: &str, params: Value) -> Result<Value, String> {
@@ -563,8 +569,10 @@ impl SlideApp {
 
     fn pick_and_open(&mut self) {
         if let Some(pick) = self.services.pick_open.as_mut() {
-            if let Some(path) = pick("open") {
-                let _ = self.open_path(&path);
+            if let Some(path) = pick("open")
+                && let Err(e) = self.open_path(&path)
+            {
+                self.notify(e);
             }
         } else if let Some(f) = self.services.open_async.as_mut() {
             f("open");
@@ -712,8 +720,10 @@ impl SlideApp {
         if self.session.active().is_none() && cmd != "file.openBytes" {
             let _ = self.session.execute("file.new", &json!({}));
         }
-        if let Err(e) = self.session.execute(cmd, &p) {
-            self.set_status(e.to_string());
+        match self.session.execute(cmd, &p) {
+            Err(e) if cmd == "file.openBytes" => self.notify(e.to_string()),
+            Err(e) => self.set_status(e.to_string()),
+            Ok(_) => {}
         }
     }
 

From 75c280d253f26475c99adce6195235326f715aa9 Mon Sep 17 00:00:00 2001
From: dotCooCoo <RobertLeeLW@gmail.com>
Date: Mon, 12 Oct 2026 22:32:53 -0700
Subject: [PATCH 064/376] Contributors: add dotCooCoo (Robert Lee)

---
 contributors/people.toml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/contributors/people.toml b/contributors/people.toml
index c10fb209..69d78f52 100644
--- a/contributors/people.toml
+++ b/contributors/people.toml
@@ -41,3 +41,7 @@ sync_github_name = true
 [people.Silvertree2010]
 display_name = "Netter"
 sync_github_name = false
+
+[people.dotCooCoo]
+real_name = "Robert Lee"
+sync_github_name = true

From 922445300b2ab1d98eb52e710fa5409a9e782e7d Mon Sep 17 00:00:00 2001
From: Yevhenii Hurin <evgeny.gurin@gmail.com>
Date: Tue, 13 Oct 2026 09:55:19 +0300
Subject: [PATCH 065/376] describe keeps a remark with its option and allows a
 bare call

animation.remove's remark belongs to its `ids` option, so describe shows
it there instead of as a note on the whole command. A command with an
all-optional set of parameters is suggested as a bare id.

[claude-opus-5-5] on behalf of hoblin
---
 apps/deckcraft-cli/src/main.rs     | 3 ++-
 apps/deckcraft-cli/tests/cli.rs    | 3 +++
 crates/engine/src/cmd/animation.rs | 2 +-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index 139b8e90..0c252fbe 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -252,7 +252,8 @@ fn describe(id: Option<&str>) -> Result<(), String> {
     if !answer.trim().is_empty() {
         outln!("Answers with {}.", answer.trim());
     }
-    let call = if params.iter().all(|p| p.optional) { c.id.to_string() } else { format!("'{}={{…}}'", c.id) };
+    let bare = params.is_empty() || params.iter().any(|p| params.iter().filter(|q| q.object == p.object).all(|q| q.optional));
+    let call = if bare { c.id.to_string() } else { format!("'{}={{…}}'", c.id) };
     outln!("\nRun it with: deckcraft-cli run --cmd {call}");
     Ok(())
 }
diff --git a/apps/deckcraft-cli/tests/cli.rs b/apps/deckcraft-cli/tests/cli.rs
index 4cb8c32e..3f1ed98b 100644
--- a/apps/deckcraft-cli/tests/cli.rs
+++ b/apps/deckcraft-cli/tests/cli.rs
@@ -115,6 +115,9 @@ Run it with: deckcraft-cli run --cmd 'format.size={…}'
 #[test]
 fn describe_shows_alternative_sets_of_parameters() {
     assert!(stdout(&cli(&["describe", "slide.go"])).contains("Parameters:\n  either:\n    index\n  or:\n    id\n"));
+    let remove = stdout(&cli(&["describe", "animation.remove"]));
+    assert!(remove.contains("  or:\n    ids, optional  (all of the shapes' animations)\n"), "{remove}");
+    assert!(remove.ends_with("Run it with: deckcraft-cli run --cmd animation.remove\n") && !remove.contains("Note:"), "{remove}");
     assert!(stdout(&cli(&["describe", "shape.move"])).contains(
         "  either:
     dx, optional   pt (relative)
diff --git a/crates/engine/src/cmd/animation.rs b/crates/engine/src/cmd/animation.rs
index 8b6fe5a7..b7989a69 100644
--- a/crates/engine/src/cmd/animation.rs
+++ b/crates/engine/src/cmd/animation.rs
@@ -28,7 +28,7 @@ pub fn specs() -> Vec<CommandSpec> {
             has_selection,
             add
         ),
-        cmd!("animation.remove", "Remove Animation", ["Animation Pane"], None, "{index} | {ids?} (all of the shapes' animations)", has_slide, remove),
+        cmd!("animation.remove", "Remove Animation", ["Animation Pane"], None, "{index} | {ids? (all of the shapes' animations)}", has_slide, remove),
         cmd!("animation.move", "Reorder Animation", ["Animations", "Timing"], None, "{index, to}", has_slide, move_anim),
         cmd!(
             "animation.timing",

From 8788f994ef42002c899c1623472912de08ba3bb9 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 10:40:59 +0300
Subject: [PATCH 066/376] Charts: keep the embedded workbook when a chart is
 saved unchanged (#335)

PowerPoint stores chart data in ppt/embeddings. Saving used to drop that part and the chart relationship, so the deck still rendered but the workbook was gone. An edit still omits the workbook rather than writing numbers that no longer match it.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                       |   4 +-
 crates/model/src/chart.rs        |  30 +++++++
 crates/pptx/src/opc.rs           |  42 +++++++++-
 crates/pptx/src/read/chart.rs    |  56 +++++++++++++
 crates/pptx/src/read/shapes.rs   |   3 +-
 crates/pptx/src/write/chart.rs   |  52 ++++++++++--
 crates/pptx/src/write/mod.rs     |   8 +-
 crates/pptx/tests/chart_embed.rs | 137 +++++++++++++++++++++++++++++++
 docs/file-format-parity.md       |   5 +-
 docs/gaps.md                     |   6 +-
 10 files changed, 328 insertions(+), 15 deletions(-)
 create mode 100644 crates/pptx/tests/chart_embed.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 2dba0e27..9e52b416 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (unchanged charts keep their embedded workbook, #335) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Saving a presentation keeps the embedded workbook behind an unchanged chart, and the chart part's relationships (#335). Editing the chart drops that workbook instead of writing numbers that no longer match it |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
@@ -147,6 +148,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: chart workbook round-trip (#335) |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
 | 2026-10-10 | minor | Readiness-by-audience table with hours to ~95% for full, mainstream and essentials |
diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index 5ba72fc4..ff55db4f 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -162,6 +162,35 @@ pub struct Chart {
     /// Original chart XML part kept for round-trip of unmodelled options.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw: Option<String>,
+    /// Package parts the original chart still points at (embedded workbook, styles, drawings).
+    /// The writer clears this before comparing modelled state. A native save does not store the bytes.
+    #[serde(skip)]
+    pub kept: ChartKept,
+}
+
+/// One relationship of a chart part, with the target string as it was written.
+#[derive(Clone, Debug, PartialEq)]
+pub struct ChartRel {
+    pub id: String,
+    pub rel_type: String,
+    pub target: String,
+    pub external: bool,
+}
+
+/// A part reached from a chart (the workbook, a drawing, an image it uses).
+#[derive(Clone, Debug, PartialEq)]
+pub struct ChartPart {
+    /// Absolute part name (`ppt/embeddings/Workbook.xlsx`).
+    pub name: String,
+    pub content_type: String,
+    pub bytes: Vec<u8>,
+}
+
+/// Sidecar for an unchanged chart: relationships and the parts they reach.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct ChartKept {
+    pub rels: Vec<ChartRel>,
+    pub parts: Vec<ChartPart>,
 }
 
 impl Default for Chart {
@@ -187,6 +216,7 @@ impl Default for Chart {
             y_min: None,
             y_max: None,
             raw: None,
+            kept: ChartKept::default(),
         }
     }
 }
diff --git a/crates/pptx/src/opc.rs b/crates/pptx/src/opc.rs
index 4ef21c3d..f6d3d3cc 100644
--- a/crates/pptx/src/opc.rs
+++ b/crates/pptx/src/opc.rs
@@ -104,8 +104,16 @@ impl Package {
         for r in doc.root.children_named("Relationship") {
             let (Some(id), Some(ty), Some(target)) = (r.attr("Id"), r.attr("Type"), r.attr("Target")) else { continue };
             let external = r.attr("TargetMode").is_some_and(|m| m.eq_ignore_ascii_case("external"));
-            let target = if external { target.to_string() } else { resolve(&base, target) };
-            out.items.push(Rel { id: id.to_string(), kind: ty.rsplit('/').next().unwrap_or(ty).to_string(), target, external });
+            let target_raw = target.to_string();
+            let target = if external { target_raw.clone() } else { resolve(&base, target) };
+            out.items.push(Rel {
+                id: id.to_string(),
+                kind: ty.rsplit('/').next().unwrap_or(ty).to_string(),
+                ty: ty.to_string(),
+                target_raw,
+                target,
+                external,
+            });
         }
         out
     }
@@ -134,6 +142,10 @@ pub struct Rel {
     pub id: String,
     /// Last segment of the relationship type (`slide`, `image`, `media`…).
     pub kind: String,
+    /// Full relationship type URI.
+    pub ty: String,
+    /// `Target` as written in the rels part (relative path or URL).
+    pub target_raw: String,
     /// Absolute part name for internal targets; the URL for external ones.
     pub target: String,
     pub external: bool,
@@ -163,6 +175,28 @@ pub fn norm(name: &str) -> String {
     name.trim_start_matches('/').replace('\\', "/").to_ascii_lowercase()
 }
 
+/// A part a chart may carry along beside its own `chartN.xml` (workbook, style, drawing, picture).
+/// Chart documents themselves are rewritten, and nothing outside these folders is copied: a relationship
+/// must not be able to replace `ppt/slides/slide1.xml` on save.
+pub fn sidecar_part(name: &str) -> bool {
+    let n = norm(name);
+    let segs: Vec<&str> = n.split('/').filter(|s| !s.is_empty()).collect();
+    if segs.iter().any(|s| *s == "." || *s == "..") {
+        return false;
+    }
+    let (Some(root), Some(area)) = (segs.first().copied(), segs.get(1).copied()) else { return false };
+    if root != "ppt" || !matches!(area, "embeddings" | "charts" | "drawings" | "media") {
+        return false;
+    }
+    let file = segs.last().copied().unwrap_or("");
+    let stem = file.strip_prefix("chart").unwrap_or("");
+    let num = stem.strip_suffix(".xml.rels").or_else(|| stem.strip_suffix(".xml")).unwrap_or("");
+    if stem != file && !num.is_empty() && num.chars().all(|c| c.is_ascii_digit()) {
+        return false;
+    }
+    true
+}
+
 pub fn dir_of(part: &str) -> String {
     let p = part.trim_start_matches('/');
     match p.rfind('/') {
@@ -311,6 +345,10 @@ impl PackageOut {
         }
         self.files.push((rels_path(part), rels.to_xml(), true));
     }
+    pub fn part_data(&self, name: &str) -> Option<&[u8]> {
+        let n = norm(name);
+        self.files.iter().find(|(f, _, _)| norm(f) == n).map(|(_, d, _)| d.as_slice())
+    }
     /// Add a binary part; its extension gets a Default content type.
     pub fn binary(&mut self, name: &str, content_type: &str, data: Vec<u8>) {
         let ext = name.rsplit('.').next().unwrap_or("bin").to_ascii_lowercase();
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index a9a960a3..2e7ceaa2 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -225,3 +225,59 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
     }
     Some(c)
 }
+
+const MAX_KEPT_PARTS: usize = 256;
+const MAX_KEPT_DEPTH: usize = 8;
+
+/// Relationships and parts a chart points at, so a later save can write them back.
+pub(crate) fn capture_kept(pkg: &crate::opc::Package, chart_part: &str) -> deckcraft_model::chart::ChartKept {
+    use deckcraft_model::chart::{ChartKept, ChartRel};
+
+    let mut kept = ChartKept::default();
+    let mut seen = std::collections::HashSet::new();
+    seen.insert(crate::opc::norm(chart_part));
+    for r in pkg.rels(chart_part).items {
+        kept.rels.push(ChartRel { id: r.id, rel_type: r.ty, target: r.target_raw, external: r.external });
+        if !r.external {
+            copy_part(pkg, &r.target, &mut kept.parts, &mut seen, 0);
+        }
+    }
+    kept
+}
+
+fn copy_part(
+    pkg: &crate::opc::Package,
+    part: &str,
+    out: &mut Vec<deckcraft_model::chart::ChartPart>,
+    seen: &mut std::collections::HashSet<String>,
+    depth: usize,
+) {
+    use deckcraft_model::chart::ChartPart;
+
+    if depth > MAX_KEPT_DEPTH || out.len() >= MAX_KEPT_PARTS {
+        log::warn!("pptx: chart part closure stopped at {part}");
+        return;
+    }
+    let key = crate::opc::norm(part);
+    if !seen.insert(key) {
+        return;
+    }
+    let Some(bytes) = pkg.get(part) else {
+        log::warn!("pptx: chart relationship target {part} is missing");
+        return;
+    };
+    let name = pkg.original_name(part).unwrap_or(part).trim_start_matches('/').to_string();
+    let content_type = pkg.content_type(part).unwrap_or_default();
+    out.push(ChartPart { name, content_type, bytes: bytes.to_vec() });
+    let rels_name = crate::opc::rels_path(part);
+    if seen.insert(crate::opc::norm(&rels_name))
+        && let Some(rels_bytes) = pkg.get(&rels_name)
+    {
+        let name = pkg.original_name(&rels_name).unwrap_or(&rels_name).trim_start_matches('/').to_string();
+        out.push(ChartPart { name, content_type: "application/vnd.openxmlformats-package.relationships+xml".into(), bytes: rels_bytes.to_vec() });
+        let targets: Vec<String> = pkg.rels(part).items.into_iter().filter(|r| !r.external).map(|r| r.target).collect();
+        for target in targets {
+            copy_part(pkg, &target, out, seen, depth + 1);
+        }
+    }
+}
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index 51b2b863..7e5d48ba 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -368,8 +368,9 @@ fn frame(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El, depth: usize) -> S
         if let Some(c) = gd.child("chart")
             && let Some(rel) = part.rels.get(c.attr("r:id").unwrap_or(""))
             && let Some(bytes) = imp.pkg.get(&rel.target)
-            && let Some(chart) = super::read_chart_xml(bytes)
+            && let Some(mut chart) = super::read_chart_xml(bytes)
         {
+            chart.kept = super::chart::capture_kept(imp.pkg, &rel.target);
             s.kind = ShapeKind::Chart(Box::new(chart));
             return s;
         }
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index d832c34f..5a075b01 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -1,4 +1,5 @@
-//! Chart parts: a `c:chartSpace` with cached categories and values (no embedded workbook).
+//! Chart parts: a `c:chartSpace` with cached categories and values.
+//! An unchanged chart also keeps the embedded workbook and the other parts it points at.
 
 use deckcraft_model::chart::{Chart, ChartType, Series};
 use deckcraft_model::style::Fill;
@@ -362,8 +363,8 @@ fn plot_group(w: &mut W, c: &Chart, kind: ChartType, list: &[(usize, &Series)])
     w.close(tag);
 }
 
-/// The chart part XML.
-pub fn chart_xml(c: &Chart) -> Vec<u8> {
+/// The chart part XML, and whether it is the original part (so its relationships still apply).
+pub fn chart_xml(c: &Chart) -> (Vec<u8>, bool) {
     // Reuse the kept part when the chart is unchanged since it was read.
     if let Some(raw) = &c.raw
         && let Ok(doc) = crate::xml::parse(raw.as_bytes())
@@ -374,12 +375,17 @@ pub fn chart_xml(c: &Chart) -> Vec<u8> {
         if let Some(back) = crate::read::chart_from_el(&root) {
             let mut me = c.clone();
             me.raw = None;
+            // The sidecar is not modelled chart state. Comparing it would throw away an unchanged chart.
+            me.kept = Default::default();
             if back == me {
                 let mut keep = doc.root;
-                keep.remove_all(&["externalData", "userShapes"]);
+                // Without the parts those elements point at, PowerPoint repairs the file.
+                if c.kept.rels.is_empty() {
+                    keep.remove_all(&["externalData", "userShapes"]);
+                }
                 let mut w = W::new();
                 w.raw(&keep.to_xml());
-                return w.finish();
+                return (w.finish(), true);
             }
         }
     }
@@ -477,5 +483,39 @@ pub fn chart_xml(c: &Chart) -> Vec<u8> {
         sp_pr(&mut w, Some(f), None);
     }
     w.close("c:chartSpace");
-    w.finish()
+    (w.finish(), false)
+}
+
+/// Write the chart's own relationships and the parts they reach.
+pub fn write_kept(pkg: &mut crate::opc::PackageOut, chart_name: &str, c: &Chart) {
+    if c.kept.rels.is_empty() && c.kept.parts.is_empty() {
+        return;
+    }
+    let mut rels = crate::opc::RelsOut::default();
+    for r in &c.kept.rels {
+        rels.items.push((r.id.clone(), r.rel_type.clone(), r.target.clone(), r.external));
+    }
+    pkg.rels(chart_name, &rels);
+    for p in &c.kept.parts {
+        match pkg.part_data(&p.name) {
+            Some(existing) if existing != p.bytes.as_slice() => {
+                log::warn!("pptx: chart part {} already written with different bytes; keeping the first", p.name);
+                continue;
+            }
+            Some(_) => continue,
+            None => {}
+        }
+        if !crate::opc::sidecar_part(&p.name) {
+            log::warn!("pptx: not writing chart part {}", p.name);
+            continue;
+        }
+        let owned;
+        let ct = if !p.content_type.is_empty() {
+            p.content_type.as_str()
+        } else {
+            owned = crate::mime_for(&p.name).to_string();
+            owned.as_str()
+        };
+        pkg.binary(&p.name, ct, p.bytes.clone());
+    }
 }
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..dc9ccf50 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -161,7 +161,13 @@ impl Exp<'_> {
     pub fn chart_rel(&mut self, o: &mut Out, c: &deckcraft_model::Chart) -> String {
         self.n_chart += 1;
         let name = format!("ppt/charts/chart{}.xml", self.n_chart);
-        self.pkg.xml_part(&name, CT_CHART, chart::chart_xml(c));
+        let (xml, preserved) = chart::chart_xml(c);
+        self.pkg.xml_part(&name, CT_CHART, xml);
+        if preserved {
+            chart::write_kept(&mut self.pkg, &name, c);
+        } else if !c.kept.parts.is_empty() {
+            log::warn!("pptx: chart data changed; the embedded workbook was not written back");
+        }
         o.rels.add_new("chart", &opc::relative(&o.name, &name), false)
     }
 }
diff --git a/crates/pptx/tests/chart_embed.rs b/crates/pptx/tests/chart_embed.rs
new file mode 100644
index 00000000..47b2f709
--- /dev/null
+++ b/crates/pptx/tests/chart_embed.rs
@@ -0,0 +1,137 @@
+//! An unchanged chart keeps the embedded workbook its `c:externalData` points at (#335).
+
+use std::io::{Cursor, Read, Write};
+use std::sync::Arc;
+
+use deckcraft_geom::Xfrm;
+use deckcraft_model::chart::{Chart, ChartType};
+use deckcraft_model::{LayoutType, Shape, ShapeId, ShapeKind, defaults};
+
+const WORKBOOK: &[u8] = b"chart-workbook-bytes-v1";
+const EMBED: &str = "ppt/embeddings/Microsoft_Excel_Worksheet1.xlsx";
+
+fn chart_pptx() -> Vec<u8> {
+    let mut p = defaults::new_presentation(None);
+    p.slides.clear();
+    let layout = defaults::layout_of_kind(&p, LayoutType::Blank).unwrap_or_default();
+    let mut slide = defaults::new_slide(&mut p, layout);
+    let mut shape = Shape { id: ShapeId(p.alloc_id()), name: "Pie".into(), xfrm: Some(Xfrm::new(40.0, 40.0, 400.0, 300.0)), ..Default::default() };
+    shape.kind = ShapeKind::Chart(Box::new(Chart::sample(ChartType::Pie)));
+    slide.shapes.push(shape);
+    p.slides.push(Arc::new(slide));
+    deckcraft_pptx::export(&p).expect("export")
+}
+
+/// Add an embedded workbook and point the chart part at it, the way PowerPoint writes a chart.
+fn with_workbook(bytes: &[u8]) -> Vec<u8> {
+    let mut zip = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let opts = zip::write::SimpleFileOptions::default();
+    let mut chart_part = None;
+    for i in 0..zip.len() {
+        let mut f = zip.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        let mut data = vec![];
+        f.read_to_end(&mut data).expect("read");
+        if name.starts_with("ppt/charts/chart") && name.ends_with(".xml") && !name.contains("_rels") {
+            let xml = String::from_utf8(data).expect("chart xml");
+            assert!(xml.contains("</c:chartSpace>"), "{name}");
+            data = xml
+                .replacen("</c:chartSpace>", r#"<c:externalData r:id="rId1"><c:autoUpdate val="0"/></c:externalData></c:chartSpace>"#, 1)
+                .into_bytes();
+            chart_part = Some(name.clone());
+        } else if name == "[Content_Types].xml" {
+            let xml = String::from_utf8(data).expect("content types");
+            data = xml
+                .replacen(
+                    "</Types>",
+                    r#"<Override PartName="/ppt/embeddings/Microsoft_Excel_Worksheet1.xlsx" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"/></Types>"#,
+                    1,
+                )
+                .into_bytes();
+        }
+        out.start_file(&name, opts).expect("start");
+        out.write_all(&data).expect("write");
+    }
+    let chart_part = chart_part.expect("chart part");
+    let rels = format!("ppt/charts/_rels/{}.rels", chart_part.rsplit('/').next().unwrap_or("chart1.xml"));
+    let rels_xml = br#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/package" Target="../embeddings/Microsoft_Excel_Worksheet1.xlsx"/></Relationships>"#;
+    out.start_file(rels, opts).expect("rels");
+    out.write_all(rels_xml).expect("rels bytes");
+    out.start_file(EMBED, opts).expect("embed");
+    out.write_all(WORKBOOK).expect("workbook");
+    out.finish().expect("finish").into_inner()
+}
+
+fn parts(bytes: &[u8]) -> Vec<(String, Vec<u8>)> {
+    let mut zip = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut out = vec![];
+    for i in 0..zip.len() {
+        let mut f = zip.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        let mut data = vec![];
+        f.read_to_end(&mut data).expect("read");
+        out.push((name, data));
+    }
+    out
+}
+
+fn chart_of(bytes: &[u8]) -> deckcraft_model::Chart {
+    let p = deckcraft_pptx::import(bytes).expect("import");
+    p.slides
+        .iter()
+        .flat_map(|s| s.shapes.iter())
+        .find_map(|s| match &s.kind {
+            ShapeKind::Chart(c) if s.name == "Pie" => Some((**c).clone()),
+            _ => None,
+        })
+        .expect("pie chart")
+}
+
+#[test]
+fn an_unchanged_chart_keeps_its_embedded_workbook() {
+    let src = with_workbook(&chart_pptx());
+    let chart = chart_of(&src);
+    assert_eq!(chart.kept.parts.iter().filter(|p| p.name == EMBED).count(), 1);
+    assert_eq!(chart.kept.parts.iter().find(|p| p.name == EMBED).map(|p| p.bytes.as_slice()), Some(WORKBOOK));
+
+    let saved = deckcraft_pptx::export(&deckcraft_pptx::import(&src).expect("import")).expect("export");
+    let saved_parts = parts(&saved);
+    let workbook = saved_parts.iter().find(|(n, _)| n == EMBED).map(|(_, d)| d.as_slice());
+    assert_eq!(workbook, Some(WORKBOOK), "the embedding part is dropped on save");
+    let rels = saved_parts
+        .iter()
+        .find(|(n, _)| n.starts_with("ppt/charts/_rels/chart") && n.ends_with(".xml.rels"))
+        .map(|(_, d)| String::from_utf8_lossy(d).into_owned())
+        .expect("chart relationships");
+    assert!(rels.contains("../embeddings/Microsoft_Excel_Worksheet1.xlsx"), "{rels}");
+    let xml = saved_parts
+        .iter()
+        .find(|(n, _)| n.starts_with("ppt/charts/chart") && n.ends_with(".xml"))
+        .map(|(_, d)| String::from_utf8_lossy(d).into_owned())
+        .expect("chart xml");
+    assert!(xml.contains("externalData"), "{xml}");
+}
+
+#[test]
+fn an_edited_chart_does_not_write_a_stale_workbook() {
+    let src = with_workbook(&chart_pptx());
+    let mut p = deckcraft_pptx::import(&src).expect("import");
+    let slide = Arc::make_mut(p.slides.get_mut(0).expect("slide"));
+    let chart = slide.shapes.iter_mut().find_map(|s| match &mut s.kind {
+        ShapeKind::Chart(c) if s.name == "Pie" => Some(c),
+        _ => None,
+    });
+    let chart = chart.expect("pie");
+    let value = chart.series.get_mut(0).and_then(|s| s.values.get_mut(0)).expect("value");
+    *value = Some(99.0);
+    let saved = parts(&deckcraft_pptx::export(&p).expect("export"));
+    assert!(saved.iter().all(|(n, _)| n != EMBED), "a stale workbook was written after the chart changed");
+    let xml = saved
+        .iter()
+        .find(|(n, _)| n.starts_with("ppt/charts/chart") && n.ends_with(".xml"))
+        .map(|(_, d)| String::from_utf8_lossy(d).into_owned())
+        .expect("chart xml");
+    assert!(!xml.contains("externalData"), "{xml}");
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..1eb86aff 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (an unchanged chart keeps its embedded workbook on save, #335) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -72,7 +72,7 @@ the round trip even though DeckCraft doesn't model it.
 | Text warp (`prstTxWarp`) | yes | yes | All 40 presets rendered (`crates/geom/src/warp.rs`); adjust values (`avLst`) round-trip |
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | |
-| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
+| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. An unchanged chart also keeps its embedded workbook and the other parts its relationships point at (#335); editing the chart drops that workbook instead of writing a stale one |
 | Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Unchanged charts keep the embedded workbook (`ppt/embeddings/`) and chart relationships (#335) |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index d14700b0..f7552f6d 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (unchanged chart workbooks round-trip, #335) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -146,7 +146,8 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
-  whisker) aren't read.
+  whisker) aren't read. An unchanged chart's embedded workbook now survives save (#335); editing
+  the chart still drops it rather than writing a stale spreadsheet.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 
@@ -255,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Chart workbook round-trip (#335) noted under the charts gap; editing chart data is still open |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
 | 2026-10-12 | minor | Text warps render (all 40 presets, adjusts round-trip); the warp gap is now the gallery, command and handles |

From 71c5b1712ad3ac8bb40b876d59bd1effab59173a Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 10:53:08 +0300
Subject: [PATCH 067/376] Charts: ignore relationships that point outside a
 chart's own parts (#335)

A chart relationship must not be able to replace a slide or another package part when the deck is saved.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/pptx/src/opc.rs           | 13 ++++++++
 crates/pptx/src/read/chart.rs    | 51 ++++++++++++++++++++++++--------
 crates/pptx/src/write/chart.rs   | 10 ++-----
 crates/pptx/tests/chart_embed.rs | 10 ++++++-
 4 files changed, 63 insertions(+), 21 deletions(-)

diff --git a/crates/pptx/src/opc.rs b/crates/pptx/src/opc.rs
index f6d3d3cc..2a44722f 100644
--- a/crates/pptx/src/opc.rs
+++ b/crates/pptx/src/opc.rs
@@ -402,4 +402,17 @@ mod tests {
         assert_eq!(relative("ppt/presentation.xml", "ppt/slides/slide1.xml"), "slides/slide1.xml");
         assert_eq!(relative("ppt/slides/slide1.xml", "ppt/slides/slide2.xml"), "slide2.xml");
     }
+
+    #[test]
+    fn sidecar_parts_stay_inside_chart_folders() {
+        assert!(sidecar_part("ppt/embeddings/Microsoft_Excel_Worksheet1.xlsx"));
+        assert!(sidecar_part("ppt/charts/style1.xml"));
+        assert!(sidecar_part("ppt/drawings/chartDrawing1.xml"));
+        assert!(sidecar_part("ppt/media/image1.png"));
+        assert!(!sidecar_part("ppt/charts/chart1.xml"));
+        assert!(!sidecar_part("ppt/charts/_rels/chart1.xml.rels"));
+        assert!(!sidecar_part("ppt/slides/slide1.xml"));
+        assert!(!sidecar_part("ppt/embeddings/../../ppt/slides/slide1.xml"));
+        assert!(!sidecar_part("/etc/passwd"));
+    }
 }
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 2e7ceaa2..9cf694f0 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -234,45 +234,71 @@ pub(crate) fn capture_kept(pkg: &crate::opc::Package, chart_part: &str) -> deckc
     use deckcraft_model::chart::{ChartKept, ChartRel};
 
     let mut kept = ChartKept::default();
-    let mut seen = std::collections::HashSet::new();
-    seen.insert(crate::opc::norm(chart_part));
+    // The chart document itself is rewritten; don't store a second copy of it.
+    let mut seen = std::collections::HashMap::from([(crate::opc::norm(chart_part), true)]);
     for r in pkg.rels(chart_part).items {
-        kept.rels.push(ChartRel { id: r.id, rel_type: r.ty, target: r.target_raw, external: r.external });
-        if !r.external {
-            copy_part(pkg, &r.target, &mut kept.parts, &mut seen, 0);
+        if !safe_rel(&r.id, &r.ty, &r.target_raw) {
+            log::warn!("pptx: skipping chart relationship {}", r.id);
+            continue;
+        }
+        if r.external {
+            kept.rels.push(ChartRel { id: r.id, rel_type: r.ty, target: r.target_raw, external: true });
+            continue;
+        }
+        if copy_part(pkg, &r.target, &mut kept.parts, &mut seen, 0) {
+            kept.rels.push(ChartRel { id: r.id, rel_type: r.ty, target: r.target_raw, external: false });
         }
     }
     kept
 }
 
+fn safe_rel(id: &str, ty: &str, target: &str) -> bool {
+    [id, ty, target].iter().all(|s| !s.is_empty() && s.len() <= 4096 && !s.chars().any(|c| c.is_control() || matches!(c, '<' | '>' | '"' | '\'')))
+}
+
+/// `true` when `part` is stored (now or from an earlier relationship).
 fn copy_part(
     pkg: &crate::opc::Package,
     part: &str,
     out: &mut Vec<deckcraft_model::chart::ChartPart>,
-    seen: &mut std::collections::HashSet<String>,
+    seen: &mut std::collections::HashMap<String, bool>,
     depth: usize,
-) {
+) -> bool {
     use deckcraft_model::chart::ChartPart;
 
     if depth > MAX_KEPT_DEPTH || out.len() >= MAX_KEPT_PARTS {
         log::warn!("pptx: chart part closure stopped at {part}");
-        return;
+        return false;
     }
     let key = crate::opc::norm(part);
-    if !seen.insert(key) {
-        return;
+    if let Some(ok) = seen.get(&key) {
+        return *ok;
+    }
+    if !crate::opc::sidecar_part(part) {
+        log::warn!("pptx: chart relationship target {part} is not kept");
+        seen.insert(key, false);
+        return false;
     }
     let Some(bytes) = pkg.get(part) else {
         log::warn!("pptx: chart relationship target {part} is missing");
-        return;
+        seen.insert(key, false);
+        return false;
     };
     let name = pkg.original_name(part).unwrap_or(part).trim_start_matches('/').to_string();
+    if !crate::opc::sidecar_part(&name) {
+        log::warn!("pptx: chart part name {name} is not kept");
+        seen.insert(key, false);
+        return false;
+    }
     let content_type = pkg.content_type(part).unwrap_or_default();
     out.push(ChartPart { name, content_type, bytes: bytes.to_vec() });
+    seen.insert(key, true);
     let rels_name = crate::opc::rels_path(part);
-    if seen.insert(crate::opc::norm(&rels_name))
+    if crate::opc::sidecar_part(&rels_name)
+        && seen.get(&crate::opc::norm(&rels_name)).is_none()
         && let Some(rels_bytes) = pkg.get(&rels_name)
     {
+        seen.insert(crate::opc::norm(&rels_name), true);
         let name = pkg.original_name(&rels_name).unwrap_or(&rels_name).trim_start_matches('/').to_string();
         out.push(ChartPart { name, content_type: "application/vnd.openxmlformats-package.relationships+xml".into(), bytes: rels_bytes.to_vec() });
         let targets: Vec<String> = pkg.rels(part).items.into_iter().filter(|r| !r.external).map(|r| r.target).collect();
@@ -280,4 +306,5 @@ fn copy_part(
             copy_part(pkg, &target, out, seen, depth + 1);
         }
     }
+    true
 }
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 5a075b01..752f712f 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -509,13 +509,7 @@ pub fn write_kept(pkg: &mut crate::opc::PackageOut, chart_name: &str, c: &Chart)
             log::warn!("pptx: not writing chart part {}", p.name);
             continue;
         }
-        let owned;
-        let ct = if !p.content_type.is_empty() {
-            p.content_type.as_str()
-        } else {
-            owned = crate::mime_for(&p.name).to_string();
-            owned.as_str()
-        };
-        pkg.binary(&p.name, ct, p.bytes.clone());
+        let ct = if !p.content_type.is_empty() { p.content_type.clone() } else { crate::mime_for(&p.name).to_string() };
+        pkg.binary(&p.name, &ct, p.bytes.clone());
     }
 }
diff --git a/crates/pptx/tests/chart_embed.rs b/crates/pptx/tests/chart_embed.rs
index 47b2f709..ed5a8def 100644
--- a/crates/pptx/tests/chart_embed.rs
+++ b/crates/pptx/tests/chart_embed.rs
@@ -56,7 +56,7 @@ fn with_workbook(bytes: &[u8]) -> Vec<u8> {
     let chart_part = chart_part.expect("chart part");
     let rels = format!("ppt/charts/_rels/{}.rels", chart_part.rsplit('/').next().unwrap_or("chart1.xml"));
     let rels_xml = br#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/package" Target="../embeddings/Microsoft_Excel_Worksheet1.xlsx"/></Relationships>"#;
+<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/package" Target="../embeddings/Microsoft_Excel_Worksheet1.xlsx"/><Relationship Id="rIdBad" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide" Target="../slides/slide1.xml"/></Relationships>"#;
     out.start_file(rels, opts).expect("rels");
     out.write_all(rels_xml).expect("rels bytes");
     out.start_file(EMBED, opts).expect("embed");
@@ -106,6 +106,14 @@ fn an_unchanged_chart_keeps_its_embedded_workbook() {
         .map(|(_, d)| String::from_utf8_lossy(d).into_owned())
         .expect("chart relationships");
     assert!(rels.contains("../embeddings/Microsoft_Excel_Worksheet1.xlsx"), "{rels}");
+    assert!(!rels.contains("slide1.xml"), "a chart relationship must not replace the slide: {rels}");
+    let slide = saved_parts
+        .iter()
+        .find(|(n, _)| n == "ppt/slides/slide1.xml")
+        .map(|(_, d)| String::from_utf8_lossy(d).into_owned())
+        .expect("slide");
+    assert!(slide.contains("sld"), "{slide}");
+    assert!(!slide.as_bytes().windows(WORKBOOK.len()).any(|w| w == WORKBOOK));
     let xml = saved_parts
         .iter()
         .find(|(n, _)| n.starts_with("ppt/charts/chart") && n.ends_with(".xml"))

From 5207844798e29375e343a0a12e8af2d0761f6370 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 10:55:10 +0300
Subject: [PATCH 068/376] Credit Nikita Rakitin in the About window

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 contributors/people.toml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/contributors/people.toml b/contributors/people.toml
index c10fb209..bac8a68c 100644
--- a/contributors/people.toml
+++ b/contributors/people.toml
@@ -41,3 +41,6 @@ sync_github_name = true
 [people.Silvertree2010]
 display_name = "Netter"
 sync_github_name = false
+
+[people.NikitkaRa]
+real_name = "Nikita Rakitin"

From 0d6301cb7c159ca59a14a4b8c11d9a7d28f1828c Mon Sep 17 00:00:00 2001
From: natocool2 <natocool@gmail.com>
Date: Tue, 13 Oct 2026 09:07:44 +0100
Subject: [PATCH 069/376] Bump quick-xml to 0.41 (RUSTSEC-2026-0194,
 RUSTSEC-2026-0195)

RUSTSEC-2026-0194 (quadratic duplicate-attribute check) and RUSTSEC-2026-0195 (unbounded NsReader
namespace allocation) are fixed in quick-xml 0.41. deckcraft-pptx already reads attributes with
with_checks(false) and does not use NsReader, so neither is reachable today; the bump keeps the
workspace on a supported quick-xml and leaves one copy (wayland-scanner already locks 0.41.0).

decode_and_unescape_value() is deprecated in 0.41 (clippy -D warnings); decoded_and_normalized_value
(Implicit1_0, ...) is what the deprecated method now does.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
---
 Cargo.lock             | 13 ++-----------
 Cargo.toml             |  2 +-
 crates/pptx/src/xml.rs |  6 ++++--
 3 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index f4d53470..1a846a5b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1099,7 +1099,7 @@ dependencies = [
  "deckcraft-model",
  "image",
  "log",
- "quick-xml 0.38.4",
+ "quick-xml",
  "serde_json",
  "thiserror 2.0.21",
  "zip",
@@ -3437,15 +3437,6 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a993555f31e5a609f617c12db6250dedcac1b0a85076912c436e6fc9b2c8e6a3"
 
-[[package]]
-name = "quick-xml"
-version = "0.38.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b66c2058c55a409d601666cffe35f04333cf1013010882cec174a7467cd4e21c"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "quick-xml"
 version = "0.41.0"
@@ -4880,7 +4871,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "338e30461b3a2b67d70eb30a6d89f8e0c93a833e07d2ae89085cd070c4a00ac0"
 dependencies = [
  "proc-macro2",
- "quick-xml 0.41.0",
+ "quick-xml",
  "quote",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index b8596156..bcf88292 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -59,7 +59,7 @@ vello_common = { version = "0.2", default-features = false }
 image = { version = "0.25", default-features = false, features = ["png", "jpeg", "webp", "gif", "tiff", "bmp"] }
 krilla = { version = "0.8", features = ["pdf"] }
 i_overlay = "9"
-quick-xml = "0.38"
+quick-xml = "0.41"
 zip = { version = "3", default-features = false, features = ["deflate"] }
 
 # ui
diff --git a/crates/pptx/src/xml.rs b/crates/pptx/src/xml.rs
index 60a94817..4146d228 100644
--- a/crates/pptx/src/xml.rs
+++ b/crates/pptx/src/xml.rs
@@ -340,8 +340,10 @@ fn start_el(b: &quick_xml::events::BytesStart, reader: &quick_xml::Reader<&[u8]>
     let mut attrs = vec![];
     for a in b.attributes().with_checks(false).flatten() {
         let k = String::from_utf8_lossy(a.key.as_ref()).into_owned();
-        let v =
-            a.decode_and_unescape_value(reader.decoder()).map(|c| c.into_owned()).unwrap_or_else(|_| String::from_utf8_lossy(&a.value).into_owned());
+        let v = a
+            .decoded_and_normalized_value(quick_xml::XmlVersion::Implicit1_0, reader.decoder())
+            .map(|c| c.into_owned())
+            .unwrap_or_else(|_| String::from_utf8_lossy(&a.value).into_owned());
         attrs.push((k, v));
     }
     El { name, attrs, children: vec![] }

From 18e47d1af765855d164938d10145070462fef12f Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 11:55:00 +0300
Subject: [PATCH 070/376] CLI: say that render --slide counts from 0 (#359)

--all names files slide-01.png onward, so --slide 8 on an 8-slide deck looked like an off-by-one. The index stays 0-based, matching slide.go, and the error now gives the range and the file names.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 apps/deckcraft-cli/src/main.rs | 53 +++++++++++++++++++++++++++++++---
 1 file changed, 49 insertions(+), 4 deletions(-)

diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index c450393f..bad8087c 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -3,6 +3,7 @@
 //! ```text
 //! deckcraft-cli info FILE                       # slides, titles, layouts (JSON)
 //! deckcraft-cli render (FILE | --sample) [--slide N | --all] [--scale S] OUT.png|OUT_DIR
+//! N starts at 0. --all writes slide-01.png, slide-02.png, …
 //! deckcraft-cli convert IN OUT                  # .deckcraft ⇄ .pptx, outline .txt, .png (first slide)
 //! deckcraft-cli run [--in FILE | --sample] [--cmd ID[=JSON]]... [--save OUT] [--export OUT] [--print]
 //! deckcraft-cli commands [FILTER]               # list commands (JSON)
@@ -34,6 +35,7 @@ macro_rules! outln {
 
 const USAGE: &str = "usage: deckcraft-cli info FILE
        deckcraft-cli render (FILE | --sample) [--slide N | --all] [--scale S] [--edit] OUT
+       N starts at 0 (the first slide). --all writes slide-01.png, slide-02.png, …
        deckcraft-cli convert IN OUT
        deckcraft-cli run [--in FILE | --sample] [--cmd ID[=JSON]]... [--save OUT] [--export OUT] [--print]
        deckcraft-cli commands [FILTER]
@@ -145,14 +147,11 @@ fn render(args: &[String]) -> Result<(), String> {
     open(&mut s, input.as_deref(), sample)?;
     let st = s.doc().map_err(|e| e.to_string())?;
     let n = st.doc.slides.len();
-    let list: Vec<usize> = if all { (0..n).collect() } else { vec![slide.unwrap_or(0)] };
+    let list = slide_indices(n, all, slide)?;
     if all {
         std::fs::create_dir_all(&out).map_err(|e| format!("{out}: {e}"))?;
     }
     for i in list {
-        if i >= n {
-            return Err(format!("no slide {i} (the deck has {n})"));
-        }
         let (png, w, h) = deckcraft_engine::cmd::file::render_png(&st.doc, i, scale, edit);
         let path = if all { format!("{out}/slide-{:02}.png", i + 1) } else { out.clone() };
         std::fs::write(&path, png).map_err(|e| format!("{path}: {e}"))?;
@@ -161,6 +160,32 @@ fn render(args: &[String]) -> Result<(), String> {
     Ok(())
 }
 
+/// Slides `--slide` asks for. `N` is a 0-based index, the same one `slide.go` uses.
+/// `--all` still names files from 1 (`slide-01.png`), which is PowerPoint's slide number.
+fn slide_indices(n: usize, all: bool, slide: Option<usize>) -> Result<Vec<usize>, String> {
+    if all {
+        return Ok((0..n).collect());
+    }
+    let i = slide.unwrap_or(0);
+    if i >= n {
+        return Err(missing_slide(i, n));
+    }
+    Ok(vec![i])
+}
+
+fn missing_slide(i: usize, n: usize) -> String {
+    match n {
+        0 => format!("no slide index {i} (this deck has no slides)"),
+        1 => format!("no slide index {i} (this deck has 1 slide, index 0, which --all names slide-01.png)"),
+        n => {
+            let last = n - 1;
+            format!(
+                "no slide index {i} (this deck has {n} slides, numbered 0 through {last}; --all names them slide-01.png through slide-{n:02}.png)"
+            )
+        }
+    }
+}
+
 fn convert(args: &[String]) -> Result<(), String> {
     let (Some(input), Some(out)) = (args.first(), args.get(1)) else { return Err("convert needs IN and OUT".into()) };
     let mut s = Session::new();
@@ -278,3 +303,23 @@ fn mcp(args: &[String]) -> Result<(), String> {
     let stdin = std::io::stdin();
     server.serve(stdin.lock(), std::io::stdout()).map_err(|e| e.to_string())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::{missing_slide, slide_indices};
+
+    #[test]
+    fn slide_numbers_start_at_zero_and_files_at_one() {
+        assert_eq!(slide_indices(8, false, None).ok().as_deref(), Some(&[0][..]));
+        assert_eq!(slide_indices(8, false, Some(0)).ok().as_deref(), Some(&[0][..]));
+        assert_eq!(slide_indices(8, false, Some(7)).ok().as_deref(), Some(&[7][..]));
+        assert_eq!(slide_indices(8, true, None).ok().as_deref(), Some(&[0, 1, 2, 3, 4, 5, 6, 7][..]));
+        let err = slide_indices(8, false, Some(8)).err().unwrap_or_default();
+        assert!(!err.is_empty(), "index 8 was accepted");
+        assert!(err.contains("numbered 0 through 7"), "{err}");
+        assert!(err.contains("slide-01.png"), "{err}");
+        assert!(err.contains("slide-08.png"), "{err}");
+        assert!(missing_slide(0, 0).contains("no slides"));
+        assert!(missing_slide(1, 1).contains("index 0"));
+    }
+}

From 8a4342757bfd0c8c1b4c13736689d95f01067d9f Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:22:04 +0200
Subject: [PATCH 071/376] SmartArt: text is laid out on its text rectangle
 (dsp:txXfrm), not in columns

A SmartArt drawing shape keeps its text rectangle in dsp:txXfrm, apart
from the shape's own box. The importer ignored it and laid the text out
in the shape itself. In list layouts the shape is a tall, narrow box
turned by 90 degrees, so the text came out as narrow vertical columns,
in the editor and in the exported PPTX.

The text rectangle uses the shape's coordinate space and is turned by
the shape's rotation plus its own:

- When it is the shape's text area shrunk by some margin, with the same
  orientation, the shape keeps its text and the margin is added to its
  insets.
- Otherwise (a rectangle reaching outside the shape, or turned against
  it) the text moves to a new shape without fill or outline, placed on
  the rectangle right above its shape in the diagram's group.

Both export as plain DrawingML (positive insets, an ordinary rotated
shape), which other readers lay out the same way.

Test: a SmartArt drawing built in the test, with a text rectangle wider
than its shape, a turned shape with upright text, and a rectangle
inside its shape; the laid-out text box is checked on import and after
a PPTX round trip.
---
 crates/pptx/src/read/shapes.rs | 107 +++++++++++++++++++++
 crates/pptx/tests/smartart.rs  | 167 +++++++++++++++++++++++++++++++++
 2 files changed, 274 insertions(+)
 create mode 100644 crates/pptx/tests/smartart.rs

diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index 51b2b863..b4c3348e 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -429,12 +429,119 @@ fn smartart(imp: &mut Imp, part: &Part, gd: &El, frame: &Shape, depth: usize) ->
     if children.is_empty() {
         return None;
     }
+    let children = smartart_text_rects(imp, &mut sub, tree, children, depth + 1);
     let mut g = frame.clone();
     let x = frame.xfrm.unwrap_or_default();
     g.kind = ShapeKind::Group { children, child: Xfrm::new(0.0, 0.0, x.w, x.h) };
     Some(g)
 }
 
+/// A SmartArt drawing shape (`dsp:sp`) keeps its text rectangle in `dsp:txXfrm`, apart from the
+/// shape's own box: the text of a narrow shape turned by 90° is often laid out across it. Put each
+/// shape's text on that rectangle. `shapes` are what [`sp_tree`] read from `tree`, in order.
+fn smartart_text_rects(imp: &mut Imp, ctx: &mut IdCtx, tree: &El, shapes: Vec<Shape>, depth: usize) -> Vec<Shape> {
+    if depth > MAX_TREE_DEPTH {
+        return shapes;
+    }
+    let mut out = Vec::with_capacity(shapes.len());
+    let mut shapes = shapes.into_iter();
+    // The same elements `sp_tree` turns into shapes.
+    for e in tree.elements().filter(|e| matches!(e.local(), "sp" | "pic" | "grpSp" | "cxnSp" | "graphicFrame")) {
+        let Some(mut s) = shapes.next() else { break };
+        let mut text_box = None;
+        match (e.local(), &mut s.kind) {
+            ("grpSp", ShapeKind::Group { children, .. }) => {
+                let kids = std::mem::take(children);
+                *children = smartart_text_rects(imp, ctx, e, kids, depth + 1);
+            }
+            ("sp", ShapeKind::Shape) => {
+                if let Some(t) = e.child("txXfrm") {
+                    text_box = text_on_rect(imp, ctx, &mut s, dml::xfrm(t).0);
+                }
+            }
+            _ => {}
+        }
+        out.push(s);
+        out.extend(text_box);
+    }
+    out.extend(shapes);
+    out
+}
+
+/// Lay out the text of `s` on `t`, a text rectangle in the same space as the shape's box, turned by
+/// the shape's rotation plus its own. When that is the shape's text area shrunk by some margin, the
+/// shape keeps its text with wider insets. Otherwise (a rectangle reaching outside the shape, or
+/// turned against it) the text moves to a new frameless text shape over `s`, which is returned:
+/// both export as plain DrawingML that any reader lays out the same way.
+fn text_on_rect(imp: &mut Imp, ctx: &mut IdCtx, s: &mut Shape, t: Xfrm) -> Option<Shape> {
+    const EPS: f64 = 0.01;
+    let x = s.xfrm?;
+    if !x.is_finite() || !t.is_finite() || t.w <= EPS || t.h <= EPS {
+        return None;
+    }
+    let body = s.text.as_mut().filter(|b| !b.is_empty())?;
+    let turn = |a: f64| a.rem_euclid(360.0);
+    let upright = |a: f64| turn(a + EPS) < 2.0 * EPS;
+    let bp = &mut body.body;
+    if !x.flip_h
+        && !x.flip_v
+        && upright(t.rot)
+        && bp.rot.is_none_or(upright)
+        && bp.vert.is_none_or(|v| v == TextDir::Horizontal)
+        && bp.upright != Some(true)
+    {
+        // Same orientation as the shape: express the rectangle as insets from the shape's text area.
+        let c = x.affine().inverse() * t.center();
+        let (l, top) = (c.x - t.w / 2.0, c.y - t.h / 2.0);
+        let (r, b) = (l + t.w, top + t.h);
+        let area = text_area(&s.geom, x.w, x.h);
+        let extra = [l - area.x0, top - area.y0, area.x1 - r, area.y1 - b];
+        if extra.iter().all(|v| v.is_finite() && *v >= -EPS) {
+            let [el, et, er, eb] = extra.map(|v| v.max(0.0));
+            bp.inset_l = Some(bp.inset_l.unwrap_or(7.2) + el);
+            bp.inset_t = Some(bp.inset_t.unwrap_or(3.6) + et);
+            bp.inset_r = Some(bp.inset_r.unwrap_or(7.2) + er);
+            bp.inset_b = Some(bp.inset_b.unwrap_or(3.6) + eb);
+            return None;
+        }
+    }
+    if ctx.count >= MAX_SHAPES {
+        return None;
+    }
+    ctx.count += 1;
+    let text = s.text.take();
+    // No fill, outline or effects; the style keeps only the text colour and font.
+    let style = s.style.clone().map(|mut st| {
+        st.fill_ref.0 = 0;
+        st.line_ref.0 = 0;
+        st.effect_ref.0 = 0;
+        st
+    });
+    Some(Shape {
+        id: ctx.assign(imp, None),
+        name: s.name.clone(),
+        xfrm: Some(Xfrm { rot: turn(x.rot + t.rot), flip_h: false, flip_v: false, ..t }),
+        fill: Some(Fill::None),
+        line: Some(deckcraft_model::style::Line { fill: Some(Fill::None), ..Default::default() }),
+        style,
+        text,
+        click: s.click.clone(),
+        hover: s.hover.clone(),
+        ..Default::default()
+    })
+}
+
+/// Where a shape's geometry puts its text, in shape-local points (as the renderer computes it).
+fn text_area(geom: &Geom, w: f64, h: f64) -> deckcraft_geom::Rect {
+    let full = deckcraft_geom::Rect::new(0.0, 0.0, w, h);
+    match geom {
+        Geom::Preset { name, adj } => {
+            preset::build(name, w, h, adj).or_else(|| preset::build("rect", w, h, &[])).map(|g| g.text_rect).unwrap_or(full)
+        }
+        Geom::Custom { .. } => full,
+    }
+}
+
 fn table(imp: &mut Imp, part: &Part, tbl: &El) -> Table {
     let mut t = Table { style: "none".into(), first_row: false, band_row: false, ..Default::default() };
     if let Some(pr) = tbl.child("tblPr") {
diff --git a/crates/pptx/tests/smartart.rs b/crates/pptx/tests/smartart.rs
new file mode 100644
index 00000000..3d3dd996
--- /dev/null
+++ b/crates/pptx/tests/smartart.rs
@@ -0,0 +1,167 @@
+//! SmartArt drawings: the text of each pre-drawn shape is laid out on its `dsp:txXfrm`.
+//!
+//! The deck is built here: an export of a new presentation with a SmartArt frame, data part and
+//! drawing part written by the test.
+
+use std::io::{Cursor, Read, Write};
+
+use deckcraft_engine::render::place_slide;
+use deckcraft_geom::{Point, Rect};
+use deckcraft_model::{Presentation, ShapeKind, defaults};
+
+const EMU: f64 = 12_700.0;
+
+/// Frame of the diagram on the slide, in points.
+const FRAME: (f64, f64, f64, f64) = (72.0, 72.0, 432.0, 288.0);
+
+fn emu(pt: f64) -> i64 {
+    (pt * EMU).round() as i64
+}
+
+fn xfrm(tag: &str, rot: f64, x: f64, y: f64, w: f64, h: f64) -> String {
+    let rot = if rot == 0.0 { String::new() } else { format!(" rot=\"{}\"", (rot * 60_000.0).round() as i64) };
+    format!(r#"<{tag}{rot}><a:off x="{}" y="{}"/><a:ext cx="{}" cy="{}"/></{tag}>"#, emu(x), emu(y), emu(w), emu(h))
+}
+
+/// One `dsp:sp`: shape box, text rectangle (both in diagram points) and text.
+fn drawing_shape(prst: &str, shape: (f64, f64, f64, f64, f64), text_rect: (f64, f64, f64, f64, f64), text: &str) -> String {
+    let (r, x, y, w, h) = shape;
+    let (tr, tx, ty, tw, th) = text_rect;
+    format!(
+        r#"<dsp:sp modelId="{{00000000-0000-0000-0000-000000000000}}"><dsp:nvSpPr><dsp:cNvPr id="0" name=""/><dsp:cNvSpPr/></dsp:nvSpPr><dsp:spPr>{}<a:prstGeom prst="{prst}"><a:avLst/></a:prstGeom><a:solidFill><a:srgbClr val="DDEEFF"/></a:solidFill></dsp:spPr><dsp:style><a:lnRef idx="1"><a:schemeClr val="accent1"/></a:lnRef><a:fillRef idx="1"><a:schemeClr val="accent1"/></a:fillRef><a:effectRef idx="0"><a:schemeClr val="accent1"/></a:effectRef><a:fontRef idx="minor"><a:schemeClr val="dk1"/></a:fontRef></dsp:style><dsp:txBody><a:bodyPr wrap="square" lIns="0" tIns="0" rIns="0" bIns="0" anchor="ctr"><a:noAutofit/></a:bodyPr><a:lstStyle/><a:p><a:r><a:rPr lang="en-US" sz="1000"/><a:t>{text}</a:t></a:r></a:p></dsp:txBody>{}</dsp:sp>"#,
+        xfrm("a:xfrm", r, x, y, w, h),
+        xfrm("dsp:txXfrm", tr, tx, ty, tw, th),
+    )
+}
+
+fn entries(bytes: &[u8]) -> Vec<(String, Vec<u8>)> {
+    let mut z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    (0..z.len())
+        .map(|i| {
+            let mut f = z.by_index(i).expect("entry");
+            let mut d = vec![];
+            f.read_to_end(&mut d).expect("read");
+            (f.name().to_string(), d)
+        })
+        .collect()
+}
+
+fn zip_of(files: &[(String, Vec<u8>)]) -> Vec<u8> {
+    let mut z = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let o = zip::write::SimpleFileOptions::default();
+    for (n, d) in files {
+        z.start_file(n.as_str(), o).expect("start");
+        z.write_all(d).expect("write");
+    }
+    z.finish().expect("finish").into_inner()
+}
+
+fn replace(files: &mut [(String, Vec<u8>)], name: &str, from: &str, to: &str) {
+    let (_, d) = files.iter_mut().find(|(n, _)| n == name).unwrap_or_else(|| panic!("{name} missing"));
+    let s = String::from_utf8(d.clone()).expect("utf8");
+    assert!(s.contains(from), "{name} has no {from}");
+    *d = s.replacen(from, to, 1).into_bytes();
+}
+
+/// A deck whose first slide holds a SmartArt frame drawn by `shapes`.
+fn smartart_deck(shapes: &[String]) -> Vec<u8> {
+    let mut files = entries(&deckcraft_pptx::export(&defaults::new_presentation(None)).expect("export"));
+    let (fx, fy, fw, fh) = FRAME;
+    let frame = format!(
+        r#"<p:graphicFrame><p:nvGraphicFramePr><p:cNvPr id="90" name="Diagram 1"/><p:cNvGraphicFramePr/><p:nvPr/></p:nvGraphicFramePr><p:xfrm><a:off x="{}" y="{}"/><a:ext cx="{}" cy="{}"/></p:xfrm><a:graphic><a:graphicData uri="http://schemas.openxmlformats.org/drawingml/2006/diagram"><dgm:relIds xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram" r:dm="rIdDm" r:lo="rIdLo" r:qs="rIdQs" r:cs="rIdCs"/></a:graphicData></a:graphic></p:graphicFrame></p:spTree>"#,
+        emu(fx),
+        emu(fy),
+        emu(fw),
+        emu(fh)
+    );
+    replace(&mut files, "ppt/slides/slide1.xml", "</p:spTree>", &frame);
+    replace(
+        &mut files,
+        "ppt/slides/_rels/slide1.xml.rels",
+        "</Relationships>",
+        r#"<Relationship Id="rIdDm" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/diagramData" Target="../diagrams/data1.xml"/><Relationship Id="rIdDr" Type="http://schemas.microsoft.com/office/2007/relationships/diagramDrawing" Target="../diagrams/drawing1.xml"/></Relationships>"#,
+    );
+    let data = r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<dgm:dataModel xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><dgm:ptLst/><dgm:extLst><a:ext uri="http://schemas.microsoft.com/office/drawing/2008/diagram"><dsp:dataModelExt xmlns:dsp="http://schemas.microsoft.com/office/drawing/2008/diagram" relId="rIdDr" minVer="http://schemas.openxmlformats.org/drawingml/2006/diagram"/></a:ext></dgm:extLst></dgm:dataModel>"#;
+    let drawing = format!(
+        r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<dsp:drawing xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram" xmlns:dsp="http://schemas.microsoft.com/office/drawing/2008/diagram" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><dsp:spTree><dsp:nvGrpSpPr><dsp:cNvPr id="0" name=""/><dsp:cNvGrpSpPr/></dsp:nvGrpSpPr><dsp:grpSpPr/>{}</dsp:spTree></dsp:drawing>"#,
+        shapes.concat()
+    );
+    files.push(("ppt/diagrams/data1.xml".into(), data.as_bytes().to_vec()));
+    files.push(("ppt/diagrams/drawing1.xml".into(), drawing.into_bytes()));
+    zip_of(&files)
+}
+
+/// Each text of slide 1 with the slide-space box it is laid out in (insets applied), the number of
+/// lines, and the direction of its baseline.
+fn text_boxes(p: &Presentation) -> Vec<(String, Rect, usize, Point)> {
+    place_slide(p, 0)
+        .texts
+        .iter()
+        .map(|t| {
+            let m = t.transform;
+            let r = t.layout.inner;
+            let corners = [Point::new(r.x0, r.y0), Point::new(r.x1, r.y0), Point::new(r.x1, r.y1), Point::new(r.x0, r.y1)].map(|c| m * c);
+            let mut bounds = Rect::from_points(corners[0], corners[2]);
+            bounds = bounds.union_pt(corners[1]).union_pt(corners[3]);
+            let dir = (m * Point::new(1.0, 0.0)) - (m * Point::new(0.0, 0.0));
+            let dir = Point::new(dir.x / dir.hypot(), dir.y / dir.hypot());
+            (t.body.text(), bounds, t.layout.lines.len(), dir)
+        })
+        .collect()
+}
+
+fn near(a: Rect, b: Rect) -> bool {
+    [a.x0 - b.x0, a.y0 - b.y0, a.x1 - b.x1, a.y1 - b.y1].iter().all(|d| d.abs() < 0.05)
+}
+
+/// Diagram rectangle (x, y, w, h) → slide rectangle.
+fn on_slide(x: f64, y: f64, w: f64, h: f64) -> Rect {
+    Rect::new(FRAME.0 + x, FRAME.1 + y, FRAME.0 + x + w, FRAME.1 + y + h)
+}
+
+fn check(p: &Presentation, expected: &[(&str, Rect)]) {
+    let boxes = text_boxes(p);
+    for (text, want) in expected {
+        let (_, got, lines, dir) = boxes.iter().find(|(t, ..)| t == text).unwrap_or_else(|| panic!("no text {text:?} in {boxes:?}"));
+        assert!(near(*got, *want), "{text:?}: laid out in {got:?}, want {want:?}");
+        assert!((dir.x - 1.0).abs() < 1e-6 && dir.y.abs() < 1e-6, "{text:?}: baseline turned to {dir:?}");
+        assert_eq!(*lines, 1, "{text:?}: wrapped into {lines} lines");
+    }
+}
+
+#[test]
+fn smartart_text_follows_tx_xfrm() {
+    let deck = smartart_deck(&[
+        // A narrow shape whose text rectangle is three times wider.
+        drawing_shape("rect", (0.0, 0.0, 0.0, 72.0, 144.0), (0.0, 0.0, 36.0, 216.0, 72.0), "wider than its shape"),
+        // A tall shape turned by 90° (wide on the slide), its text rectangle turned back: horizontal text.
+        drawing_shape("roundRect", (90.0, 300.0, -60.0, 48.0, 216.0), (-90.0, 220.0, 28.0, 208.0, 40.0), "turned shape, upright text"),
+        // A text rectangle inside the shape: the shape keeps its text, with wider insets.
+        drawing_shape("roundRect", (0.0, 0.0, 192.0, 216.0, 72.0), (0.0, 24.0, 204.0, 168.0, 48.0), "inside its shape"),
+    ]);
+    let expected = [
+        ("wider than its shape", on_slide(0.0, 36.0, 216.0, 72.0)),
+        ("turned shape, upright text", on_slide(220.0, 28.0, 208.0, 40.0)),
+        ("inside its shape", on_slide(24.0, 204.0, 168.0, 48.0)),
+    ];
+
+    let p = deckcraft_pptx::import(&deck).expect("import");
+    assert!(p.validate().is_empty(), "{:?}", p.validate());
+    check(&p, &expected);
+    // The diagram is one group; text that left its shape is in a frameless shape of the group.
+    let group = p.slides[0].shapes.iter().find(|s| s.name == "Diagram 1").expect("diagram");
+    let ShapeKind::Group { children, .. } = &group.kind else { panic!("diagram is not a group") };
+    assert_eq!(children.len(), 5);
+    let inside = children.iter().find(|s| s.text.as_ref().is_some_and(|t| t.text() == "inside its shape")).expect("inside");
+    assert!(matches!(inside.geom, deckcraft_model::Geom::Preset { ref name, .. } if name == "roundRect"));
+    for moved in children.iter().filter(|s| s.text.as_ref().is_some_and(|t| t.text() != "inside its shape")) {
+        assert_eq!(moved.fill, Some(deckcraft_model::style::Fill::None));
+        assert_eq!(moved.line.as_ref().and_then(|l| l.fill.clone()), Some(deckcraft_model::style::Fill::None));
+    }
+
+    // The exported deck lays the text out in the same places.
+    let q = deckcraft_pptx::import(&deckcraft_pptx::export(&p).expect("export")).expect("re-import");
+    check(&q, &expected);
+}

From daf612b8fd9b527f39e200fe4618749829c0b8f4 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:22:06 +0200
Subject: [PATCH 072/376] Progress docs: SmartArt text on its dsp:txXfrm
 rectangle

- file-format-parity.md: SmartArt row notes the text rectangle; status line and history.
- ROADMAP.md: progress log line. No checklist row changes score (Insert SmartArt stays P), and
  the gaps.md SmartArt entry (pre-drawn shapes only) still holds.
---
 ROADMAP.md                 | 3 ++-
 docs/file-format-parity.md | 5 +++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 2dba0e27..55b57ada 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (SmartArt text on its text rectangle; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-12 | SmartArt import: text laid out on its `dsp:txXfrm` text rectangle, not squeezed into the shape (list layouts no longer show text in narrow columns) |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..78a4547e 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (SmartArt text follows `dsp:txXfrm`; previous: trivial, Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233)) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -74,7 +74,7 @@ the round trip even though DeckCraft doesn't model it.
 | Tables with styles | yes | yes | |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
 | Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
-| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
+| SmartArt (`dgm`) | drawing part only, as a group; text laid out on its `dsp:txXfrm` rectangle | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
 | Ink (`contentPart`) | yes | as a group of freeform lines | PowerPoint sees shapes, not ink |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | SmartArt import lays each shape's text out on its `dsp:txXfrm` text rectangle instead of the shape box |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |

From 9d185aeb680a5ae7dca54284eab185dd716d1ef8 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:22:11 +0200
Subject: [PATCH 073/376] Canvas: drag the frame of a text box being edited to
 move it

While a text box or placeholder is being edited, every press inside its
box placed the caret, so the box could not be moved without leaving
editing first. Like PowerPoint, a band on either side of the box edge
(the hit tolerance wide, in the shape's rotated frame) is now its frame:
hit_test reports Hit::Frame there, the canvas shows the move cursor, and
a press leaves text editing, selects the box and drags it as one undo
step. A click without a drag just selects the whole box. Inside the box
the caret and text selection work as before; resize and adjust handles
still win. The text-click zone now follows the rotated box instead of
its axis-aligned bounds.
---
 crates/engine/src/tests.rs   | 143 +++++++++++++++++++++++++++++++++++
 crates/engine/src/tools.rs   | 101 ++++++++++++++++++++-----
 crates/ui-egui/src/canvas.rs |   2 +-
 3 files changed, 224 insertions(+), 22 deletions(-)

diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..d9ddf2b5 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,146 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// A blank slide holding one text box being edited, with smart guides and grid snapping off so
+/// drags move by exactly the pointer delta. Returns the session, the box id and its box.
+fn editing_text_box(rot: f64) -> (Session, u64, deckcraft_geom::Xfrm) {
+    let mut s = session();
+    s.prefs.snap_to_grid = false;
+    s.prefs.smart_guides = false;
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let id = s.execute("insert.textBox", &json!({"rect": [200.0, 150.0, 240.0, 60.0], "text": "Hello world"})).unwrap()["id"].as_u64().unwrap();
+    if rot != 0.0 {
+        s.execute("shape.rotate", &json!({"ids": [id], "deg": rot})).unwrap();
+    }
+    s.execute("text.edit", &json!({"id": id, "at": [0, 0]})).unwrap();
+    let x = text_box_xfrm(&s, id);
+    (s, id, x)
+}
+
+fn text_box_xfrm(s: &Session, id: u64) -> deckcraft_geom::Xfrm {
+    let st = s.doc().unwrap();
+    cmd::xfrm_of(&st.doc, &st.selection, st.shape(deckcraft_model::ShapeId(id as u32)).unwrap())
+}
+
+/// Slide point for a point in the box's own (rotated) frame.
+fn on_box(x: &deckcraft_geom::Xfrm, lx: f64, ly: f64) -> (f64, f64) {
+    let p = x.affine() * deckcraft_geom::Point::new(lx, ly);
+    (p.x, p.y)
+}
+
+fn drag_gesture(s: &mut Session, from: (f64, f64), to: (f64, f64)) -> serde_json::Value {
+    let ev = |kind, (x, y): (f64, f64)| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0 };
+    let down = s.pointer(ev(PointerKind::Down, from)).unwrap();
+    let mid = ((from.0 + to.0) / 2.0, (from.1 + to.1) / 2.0);
+    s.pointer(ev(PointerKind::Drag, mid)).unwrap();
+    s.pointer(ev(PointerKind::Drag, to)).unwrap();
+    s.pointer(ev(PointerKind::Up, to)).unwrap();
+    down
+}
+
+#[test]
+fn dragging_the_frame_of_edited_text_moves_the_box() {
+    let (mut s, id, x) = editing_text_box(0.0);
+    assert!(x.h > 12.0, "{x:?}");
+    let sid = deckcraft_model::ShapeId(id as u32);
+    // Hovering the band on either side of the edge says "move"; the inside says "text".
+    for ly in [-2.0, 2.0, x.h + 2.0] {
+        let (px, py) = on_box(&x, x.w / 4.0, ly);
+        s.pointer(PointerEvent { kind: PointerKind::Move, x: px, y: py, mods: Mods::default(), tol: 3.0 }).unwrap();
+        assert_eq!(s.tool.hover, Some(tools::Hit::Frame { id: sid }), "ly {ly}");
+    }
+    let (px, py) = on_box(&x, x.w / 4.0, x.h / 2.0);
+    s.pointer(PointerEvent { kind: PointerKind::Move, x: px, y: py, mods: Mods::default(), tol: 3.0 }).unwrap();
+    assert_eq!(s.tool.hover, Some(tools::Hit::Shape { id: sid, text: true }));
+
+    // Press on the top edge, just outside, and drag: the box moves, text editing ends.
+    let undo_before = s.doc().unwrap().history.undo.len();
+    let from = on_box(&x, x.w / 4.0, -1.0);
+    let down = drag_gesture(&mut s, from, (from.0 + 30.0, from.1 + 20.0));
+    assert_eq!(down["hit"], json!({"kind": "frame", "id": id}));
+    let moved = text_box_xfrm(&s, id);
+    assert!((moved.x - (x.x + 30.0)).abs() < 1e-9 && (moved.y - (x.y + 20.0)).abs() < 1e-9, "{moved:?}");
+    assert_eq!((moved.w, moved.h), (x.w, x.h));
+    let st = s.doc().unwrap();
+    assert!(st.selection.text.is_none());
+    assert_eq!(st.selection.shapes, vec![sid]);
+    // One undo step, which puts the box back.
+    assert_eq!(st.history.undo.len(), undo_before + 1);
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(text_box_xfrm(&s, id), x);
+
+    // The inner side of the band works too; a click there without a drag selects the box whole
+    // and changes nothing.
+    s.execute("text.edit", &json!({"id": id, "at": [0, 0]})).unwrap();
+    let undo_before = s.doc().unwrap().history.undo.len();
+    let (px, py) = on_box(&x, x.w * 0.75, x.h - 1.0);
+    let ev = |kind| PointerEvent { kind, x: px, y: py, mods: Mods::default(), tol: 3.0 };
+    s.pointer(ev(PointerKind::Down)).unwrap();
+    s.pointer(ev(PointerKind::Up)).unwrap();
+    let st = s.doc().unwrap();
+    assert!(st.selection.text.is_none());
+    assert_eq!(st.selection.shapes, vec![sid]);
+    assert_eq!(st.history.undo.len(), undo_before);
+    assert_eq!(text_box_xfrm(&s, id), x);
+}
+
+#[test]
+fn dragging_inside_edited_text_selects_text() {
+    let (mut s, id, x) = editing_text_box(0.0);
+    let undo_before = s.doc().unwrap().history.undo.len();
+    let down = drag_gesture(&mut s, on_box(&x, 8.0, x.h / 2.0), on_box(&x, x.w - 8.0, x.h / 2.0));
+    assert!(down.get("caret").is_some(), "{down}");
+    assert_eq!(text_box_xfrm(&s, id), x);
+    let st = s.doc().unwrap();
+    let t = st.selection.text.as_ref().expect("still editing");
+    assert!(t.is_range(), "{t:?}");
+    assert_eq!(t.ordered(), ((0, 0), (0, 11)));
+    assert_eq!(st.history.undo.len(), undo_before);
+}
+
+#[test]
+fn frame_of_rotated_edited_text_follows_the_rotation() {
+    let (mut s, id, x) = editing_text_box(30.0);
+    assert_eq!(x.rot, 30.0);
+    let sid = deckcraft_model::ShapeId(id as u32);
+    // The rotated bottom edge is the frame; dragging it moves the box and keeps its rotation.
+    let from = on_box(&x, x.w / 4.0, x.h + 1.0);
+    assert_eq!(s.hit_test(deckcraft_geom::Point::new(from.0, from.1), 3.0), Some(tools::Hit::Frame { id: sid }));
+    let down = drag_gesture(&mut s, from, (from.0 + 25.0, from.1 - 10.0));
+    assert_eq!(down["hit"]["kind"], "frame");
+    let moved = text_box_xfrm(&s, id);
+    assert!((moved.x - (x.x + 25.0)).abs() < 1e-9 && (moved.y - (x.y - 10.0)).abs() < 1e-9, "{moved:?}");
+    assert_eq!(moved.rot, 30.0);
+    // Inside the rotated box, pressing still places the caret.
+    s.execute("text.edit", &json!({"id": id, "at": [0, 0]})).unwrap();
+    let mx = text_box_xfrm(&s, id);
+    let (px, py) = on_box(&mx, mx.w / 2.0, mx.h / 2.0);
+    let r = s.pointer(PointerEvent { kind: PointerKind::Down, x: px, y: py, mods: Mods::default(), tol: 3.0 }).unwrap();
+    s.pointer(PointerEvent { kind: PointerKind::Up, x: px, y: py, mods: Mods::default(), tol: 3.0 }).unwrap();
+    assert!(r.get("caret").is_some(), "{r}");
+    assert_eq!(text_box_xfrm(&s, id), mx);
+    // Inside the axis-aligned bounds but off the rotated box: neither text nor frame, so a press
+    // there leaves editing instead of moving the caret.
+    let off = on_box(&mx, mx.w / 2.0, -mx.h);
+    let off_pt = deckcraft_geom::Point::new(off.0, off.1);
+    assert!(mx.bounds().contains(off_pt));
+    assert_ne!(s.hit_test(off_pt, 3.0), Some(tools::Hit::Frame { id: sid }));
+    let r = s.pointer(PointerEvent { kind: PointerKind::Down, x: off.0, y: off.1, mods: Mods::default(), tol: 3.0 }).unwrap();
+    s.pointer(PointerEvent { kind: PointerKind::Up, x: off.0, y: off.1, mods: Mods::default(), tol: 3.0 }).unwrap();
+    assert!(r.get("caret").is_none(), "{r}");
+    assert!(s.doc().unwrap().selection.text.is_none());
+    assert_eq!(text_box_xfrm(&s, id), mx);
+}
+
+#[test]
+fn resize_handles_beat_the_frame_of_edited_text() {
+    let (mut s, id, x) = editing_text_box(0.0);
+    // The SE corner lies in the frame band, but its handle wins.
+    let from = on_box(&x, x.w, x.h);
+    let down = drag_gesture(&mut s, from, (from.0 + 40.0, from.1));
+    assert_eq!(down["hit"]["kind"], "resize");
+    let sized = text_box_xfrm(&s, id);
+    assert!((sized.w - (x.w + 40.0)).abs() < 1e-9, "{sized:?}");
+    assert_eq!((sized.x, sized.y), (x.x, x.y));
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..98d52b10 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -85,6 +85,11 @@ pub enum Hit {
         id: ShapeId,
         text: bool,
     },
+    /// The frame of the box whose text is being edited (a band on either side of its edge):
+    /// pressing there leaves text editing and drags the box, like PowerPoint.
+    Frame {
+        id: ShapeId,
+    },
 }
 
 #[derive(Clone, Debug)]
@@ -250,6 +255,13 @@ impl Session {
                 }
             }
         }
+        // The frame of the text being edited: grabbing it moves the box.
+        if let Some(e) = edited_box(st)
+            && e.movable
+            && edit_zone(&e.xfrm, p, tol) == EditZone::Frame
+        {
+            return Some(Hit::Frame { id: e.id });
+        }
         // Shapes, topmost first.
         // Locked objects are still picked (to format them or type in them); they just don't move.
         for sh in st.shapes().iter().rev() {
@@ -362,29 +374,25 @@ impl Session {
             ToolKind::Select => {}
         }
         let st = self.doc()?;
-        // Clicking inside the text being edited moves the caret / starts a text selection.
-        if let Some(t) = st.selection.text.clone()
-            && !t.notes
-            && t.cell.is_none()
-            && let Some(sh) = st.shape(t.shape)
+        // Clicking inside the text being edited moves the caret / starts a text selection. Its
+        // handles and its frame (see `Hit::Frame`) win: they size, rotate or move the box.
+        if let Some(e) = edited_box(st)
+            && edit_zone(&e.xfrm, p, tol) != EditZone::Outside
+            && !matches!(self.hit_test(p, tol), Some(Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. } | Hit::Frame { .. }))
+            && let Some(sh) = st.shape(e.id)
         {
-            let x = xfrm_of(&st.doc, &st.selection, sh);
-            if x.bounds().inflate(tol, tol).contains(p)
-                && !matches!(self.hit_test(p, tol), Some(Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. }))
-            {
-                let pos = text_pos(st, sh, p);
-                let shift = mods.shift;
-                self.select(|_, sel| {
-                    if let Some(tt) = sel.text.as_mut() {
-                        tt.caret = pos;
-                        if !shift {
-                            tt.anchor = pos;
-                        }
+            let pos = text_pos(st, sh, p);
+            let shift = mods.shift;
+            self.select(|_, sel| {
+                if let Some(tt) = sel.text.as_mut() {
+                    tt.caret = pos;
+                    if !shift {
+                        tt.anchor = pos;
                     }
-                })?;
-                self.tool.drag = Some(Drag::TextSelect { shape: t.shape });
-                return Ok(json!({"caret": [pos.0, pos.1]}));
-            }
+                }
+            })?;
+            self.tool.drag = Some(Drag::TextSelect { shape: e.id });
+            return Ok(json!({"caret": [pos.0, pos.1]}));
         }
         let hit = self.hit_test(p, tol);
         let st = self.doc()?;
@@ -412,6 +420,17 @@ impl Session {
                 self.begin("Adjust Shape");
                 self.tool.drag = Some(Drag::Adjust { id, index, orig });
             }
+            Some(Hit::Frame { id }) => {
+                // Like PowerPoint: the box leaves text editing and is selected whole (a click
+                // without a drag stops there), and dragging moves it as one undo step.
+                let origs: Vec<(ShapeId, Xfrm)> = st.shape(id).map(|s| (id, xfrm_of(&st.doc, &st.selection, s))).into_iter().collect();
+                self.select(|_, sel| {
+                    sel.shapes = vec![id];
+                    sel.text = None;
+                    sel.cells = None;
+                })?;
+                self.tool.drag = Some(Drag::Move { ids: vec![id], start: p, origs, moved: false, duplicate: mods.alt, enter_text: None });
+            }
             Some(Hit::Shape { id, text }) => {
                 let selected = st.selection.shapes.contains(&id);
                 let toggle = mods.shift || mods.cmd;
@@ -1097,6 +1116,46 @@ fn is_text_first(st: &crate::DocState, id: ShapeId) -> bool {
     st.shape(id).is_some_and(|s| s.ph.is_some() || s.text_box)
 }
 
+/// The box whose text is being edited on the slide (not speaker notes, not a table cell).
+struct EditedBox {
+    id: ShapeId,
+    xfrm: Xfrm,
+    /// Its frame can be grabbed to move it: not a line (no frame to grab) and not locked.
+    movable: bool,
+}
+
+fn edited_box(st: &crate::DocState) -> Option<EditedBox> {
+    let t = st.selection.text.as_ref()?;
+    if t.notes || t.cell.is_some() {
+        return None;
+    }
+    let sh = st.shape(t.shape)?;
+    Some(EditedBox { id: t.shape, xfrm: xfrm_of(&st.doc, &st.selection, sh), movable: !sh.is_line() && !sh.locked })
+}
+
+/// Where a point falls against the box of the text being edited.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum EditZone {
+    /// Well inside: the caret goes there.
+    Inside,
+    /// On the frame: a band `tol` wide on either side of the box edge.
+    Frame,
+    Outside,
+}
+
+/// Classify slide point `p` against box `x`, in the box's own (rotated, flipped) frame. Inside
+/// small boxes the band narrows to a quarter of the box so their text stays reachable.
+fn edit_zone(x: &Xfrm, p: Point, tol: f64) -> EditZone {
+    let l = x.affine().inverse() * p;
+    let (w, h) = (x.w.max(0.0), x.h.max(0.0));
+    let tol = if tol.is_finite() { tol.max(0.0) } else { 0.0 };
+    if !(l.x.is_finite() && l.y.is_finite()) || l.x < -tol || l.y < -tol || l.x > w + tol || l.y > h + tol {
+        return EditZone::Outside;
+    }
+    let inner = tol.min(w / 4.0).min(h / 4.0);
+    if l.x > inner && l.y > inner && l.x < w - inner && l.y < h - inner { EditZone::Inside } else { EditZone::Frame }
+}
+
 fn contains_rect(outer: Rect, inner: Rect) -> bool {
     inner.x0 >= outer.x0 && inner.y0 >= outer.y0 && inner.x1 <= outer.x1 && inner.y1 <= outer.y1
 }
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..0260e0b9 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -412,7 +412,7 @@ fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
                 egui::CursorIcon::Move
             }
         }
-        (_, Some(Hit::Shape { .. })) => egui::CursorIcon::Move,
+        (_, Some(Hit::Shape { .. } | Hit::Frame { .. })) => egui::CursorIcon::Move,
         _ => egui::CursorIcon::Default,
     };
     if resp.hovered() {

From 8c5f101e683e2a4f1e006fc2a0f9efb3d1bddbe4 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:22:13 +0200
Subject: [PATCH 074/376] Progress docs: drag the frame of edited text to move
 the box

- ui-parity.md: Direct manipulation row added; status line and history.
- ROADMAP.md: progress log line. The checklist rows involved (Text boxes, In-place text editing)
  are already D; no gaps.md entry covered this.
---
 ROADMAP.md        | 3 ++-
 docs/ui-parity.md | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 2dba0e27..9f1128f8 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (text box frame drag while editing; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-12 | Canvas: dragging the frame of a text box being edited moves it (move cursor on the frame, one undo step); the caret zone follows rotated boxes |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..c1e0bb61 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (the frame of a text box being edited moves it; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -81,6 +81,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Edit points on freeforms | yes | **no** |
 | Crop handles, crop to shape, aspect ratio | yes | partial |
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
+| Drag the frame of a text box being edited to move it | yes | yes |
 | Exact size/position, lock aspect | yes | yes |
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
@@ -148,6 +149,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | Dragging the frame of a text box being edited moves it, as in PowerPoint |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From ab81f6bc73aaa87a994867f35e8b9769673ba852 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:37:39 +0200
Subject: [PATCH 075/376] Canvas: right click selects the shape under the
 pointer

A right click on an unselected shape opened the slide's context menu
(Layout, Reset Slide...) because only the primary button reached the
pointer tool; the shape had to be left-clicked first. The right-button
press now goes through Session::pointer as PointerKind::ContextClick
(`contextclick` on the control channel and MCP) and selects like
PowerPoint before the menu opens: an unselected shape is selected alone
(a text box or placeholder is not put into text editing, nothing is
dragged), a selected shape keeps the selection, multiple selection
included, and empty slide clears it. In the box whose text is being
edited, the caret and text selection stay, and the context menu offers
text items (Paragraph, Bullets, Numbering, Link) next to Cut, Copy and
Paste, which act on the selected text.
---
 crates/engine/src/tests.rs    | 77 +++++++++++++++++++++++++++++++++++
 crates/engine/src/tools.rs    | 43 +++++++++++++++++++
 crates/mcp/src/headless.rs    |  4 +-
 crates/mcp/src/tools.rs       |  4 +-
 crates/ui-egui/src/canvas.rs  | 30 +++++++++++++-
 crates/ui-egui/src/control.rs |  1 +
 docs/control-protocol.md      |  2 +-
 7 files changed, 155 insertions(+), 6 deletions(-)

diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..eadebc61 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,80 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+fn text_box_xfrm(s: &Session, id: u64) -> deckcraft_geom::Xfrm {
+    let st = s.doc().unwrap();
+    cmd::xfrm_of(&st.doc, &st.selection, st.shape(deckcraft_model::ShapeId(id as u32)).unwrap())
+}
+
+fn right_click(s: &mut Session, x: f64, y: f64) -> serde_json::Value {
+    s.pointer(PointerEvent { kind: PointerKind::ContextClick, x, y, mods: Mods::default(), tol: 3.0 }).unwrap()
+}
+
+/// A blank slide with a rectangle A (100,100 200×100) and a text box B (400,100 200 wide),
+/// nothing selected.
+fn two_shapes() -> (Session, deckcraft_model::ShapeId, deckcraft_model::ShapeId) {
+    let mut s = session();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let a = s.execute("shape.insert", &json!({"preset": "rect", "rect": [100.0, 100.0, 200.0, 100.0], "text": "Shape A"})).unwrap()["id"]
+        .as_u64()
+        .unwrap();
+    let b = s.execute("insert.textBox", &json!({"rect": [400.0, 100.0, 200.0, 40.0], "text": "Box B"})).unwrap()["id"].as_u64().unwrap();
+    s.select(|_, sel| {
+        sel.shapes.clear();
+        sel.text = None;
+    })
+    .unwrap();
+    (s, deckcraft_model::ShapeId(a as u32), deckcraft_model::ShapeId(b as u32))
+}
+
+#[test]
+fn right_click_selects_the_shape_under_the_pointer() {
+    let (mut s, a, b) = two_shapes();
+    let undo_before = s.doc().unwrap().history.undo.len();
+    // An unselected shape: selected alone, no text editing, no drag.
+    let r = right_click(&mut s, 150.0, 150.0);
+    assert_eq!(r["selected"], json!([a]));
+    let st = s.doc().unwrap();
+    assert_eq!(st.selection.shapes, vec![a]);
+    assert!(st.selection.text.is_none());
+    assert!(!s.tool.dragging());
+    s.pointer(PointerEvent { kind: PointerKind::Drag, x: 190.0, y: 190.0, mods: Mods::default(), tol: 3.0 }).unwrap();
+    assert_eq!(text_box_xfrm(&s, a.0 as u64).x, 100.0);
+    // A text box, which a left click would start editing: only selected.
+    right_click(&mut s, 450.0, 115.0);
+    let st = s.doc().unwrap();
+    assert_eq!(st.selection.shapes, vec![b]);
+    assert!(st.selection.text.is_none());
+    // A multiple selection stays when the right click lands on one of its shapes.
+    s.execute("edit.select", &json!({"ids": [a, b]})).unwrap();
+    right_click(&mut s, 450.0, 115.0);
+    assert_eq!(s.doc().unwrap().selection.shapes, vec![a, b]);
+    // Empty slide: nothing selected (the slide menu).
+    let r = right_click(&mut s, 700.0, 450.0);
+    assert!(r["hit"].is_null(), "{r}");
+    assert!(s.doc().unwrap().selection.shapes.is_empty());
+    assert_eq!(s.doc().unwrap().history.undo.len(), undo_before);
+}
+
+#[test]
+fn right_click_in_edited_text_keeps_the_text_selection() {
+    let (mut s, a, b) = two_shapes();
+    s.execute("text.edit", &json!({"id": a, "at": [0, 0]})).unwrap();
+    s.execute("text.move", &json!({"to": "wordRight", "extend": true})).unwrap();
+    let before = s.doc().unwrap().selection.text.clone().unwrap();
+    assert!(before.is_range());
+    // Anywhere in the box, even away from the selected word.
+    let r = right_click(&mut s, 280.0, 185.0);
+    assert_eq!(r["editing"], true);
+    assert_eq!(s.doc().unwrap().selection.text.as_ref(), Some(&before));
+    // The context menu's Copy and Cut then act on the selected text.
+    assert_eq!(s.execute("edit.copy", &json!({})).unwrap()["text"].as_str().unwrap().trim(), "Shape");
+    s.execute("edit.cut", &json!({})).unwrap();
+    assert_eq!(s.execute("text.get", &json!({"id": a})).unwrap()["text"].as_str().unwrap().trim(), "A");
+    // A right click on another shape leaves editing and selects that shape.
+    right_click(&mut s, 450.0, 115.0);
+    let st = s.doc().unwrap();
+    assert!(st.selection.text.is_none());
+    assert_eq!(st.selection.shapes, vec![b]);
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..5728a58a 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -21,6 +21,9 @@ pub enum PointerKind {
     Move,
     DoubleClick,
     TripleClick,
+    /// Secondary-button press (right click), before the context menu opens: selects what's under
+    /// the pointer the way PowerPoint does, without editing text or starting a drag.
+    ContextClick,
 }
 
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
@@ -299,6 +302,7 @@ impl Session {
             PointerKind::Drag => self.drag(p, ev.mods, tol),
             PointerKind::Up => self.up(p, ev.mods),
             PointerKind::DoubleClick => self.double_click(p, tol),
+            PointerKind::ContextClick => self.context_click(p, tol),
             PointerKind::TripleClick => {
                 if self.active().is_some_and(|d| d.selection.text.is_some()) {
                     self.execute("text.selectParagraph", &json!({}))
@@ -826,6 +830,45 @@ impl Session {
         }
     }
 
+    /// Right-button press: the selection the context menu will act on, as in PowerPoint. In the
+    /// box being edited, the caret and text selection stay (the menu then acts on the text). On a
+    /// selected shape (or its handles) the selection stays, multiple selection included; on
+    /// another shape, that shape alone is selected; on empty slide, nothing is. Never edits text,
+    /// starts a drag or adds an undo step.
+    fn context_click(&mut self, p: Point, tol: f64) -> Result<Value> {
+        if !matches!(self.tool.kind, ToolKind::Select) || self.tool.drag.is_some() {
+            return Ok(Value::Null);
+        }
+        let st = self.doc()?;
+        // The same zone in which a left press places the caret (`down`).
+        if let Some(t) = &st.selection.text
+            && !t.notes
+            && t.cell.is_none()
+            && let Some(sh) = st.shape(t.shape)
+            && xfrm_of(&st.doc, &st.selection, sh).bounds().inflate(tol, tol).contains(p)
+        {
+            return Ok(json!({"hit": {"kind": "text", "id": t.shape}, "selected": [t.shape], "editing": true}));
+        }
+        let hit = self.hit_test(p, tol);
+        let id = match &hit {
+            Some(Hit::Shape { id, .. } | Hit::Resize { id, .. } | Hit::Rotate { id } | Hit::Adjust { id, .. } | Hit::LineEnd { id, .. }) => Some(*id),
+            None => None,
+        };
+        if !id.is_some_and(|id| st.selection.shapes.contains(&id)) {
+            self.select(|_, sel| {
+                sel.text = None;
+                sel.cells = None;
+                sel.shapes = id.into_iter().collect();
+            })?;
+        }
+        let st = self.doc()?;
+        Ok(json!({
+            "hit": serde_json::to_value(&hit).unwrap_or_default(),
+            "selected": st.selection.shapes,
+            "editing": st.selection.text.is_some(),
+        }))
+    }
+
     fn is_picture(&self, id: ShapeId) -> bool {
         self.active().and_then(|d| d.shape(id)).is_some_and(|s| matches!(s.kind, ShapeKind::Picture { .. } | ShapeKind::Media(_)))
     }
diff --git a/crates/mcp/src/headless.rs b/crates/mcp/src/headless.rs
index 512e7cc4..483fc181 100644
--- a/crates/mcp/src/headless.rs
+++ b/crates/mcp/src/headless.rs
@@ -32,6 +32,7 @@ pub fn pointer_kind(k: &str) -> Option<PointerKind> {
         "move" => PointerKind::Move,
         "doubleclick" | "dblclick" => PointerKind::DoubleClick,
         "tripleclick" => PointerKind::TripleClick,
+        "contextclick" | "rightclick" => PointerKind::ContextClick,
         _ => return None,
     })
 }
@@ -84,7 +85,8 @@ impl Headless {
         let mut last = Value::Null;
         for e in events {
             let kind = s(e, "kind").unwrap_or("");
-            let kind = pointer_kind(kind).ok_or_else(|| format!("unknown pointer kind `{kind}` (down|drag|up|move|doubleclick)"))?;
+            let kind = pointer_kind(kind)
+                .ok_or_else(|| format!("unknown pointer kind `{kind}` (down|drag|up|move|doubleclick|tripleclick|contextclick)"))?;
             let x = e.get("x").and_then(Value::as_f64).ok_or("pointer event needs `x`")?;
             let y = e.get("y").and_then(Value::as_f64).ok_or("pointer event needs `y`")?;
             let mods = e.get("mods").map(mods_from).unwrap_or(base);
diff --git a/crates/mcp/src/tools.rs b/crates/mcp/src/tools.rs
index 1a457dda..a71e8262 100644
--- a/crates/mcp/src/tools.rs
+++ b/crates/mcp/src/tools.rs
@@ -240,9 +240,9 @@ pub fn tool_definitions() -> Vec<Value> {
         tool(
             "pointer",
             "Pointer gesture",
-            "Drive the active tool with pointer events in slide points: down/drag/up/move/doubleclick, exactly like the mouse (draws, moves, resizes, rotates, places the caret).",
+            "Drive the active tool with pointer events in slide points: down/drag/up/move/doubleclick/contextclick, exactly like the mouse (draws, moves, resizes, rotates, places the caret; contextclick selects like a right click).",
             obj(
-                json!({"events": {"type": "array", "items": obj(json!({"kind": string("down|drag|up|move|doubleclick"), "x": num("x (pt)"), "y": num("y (pt)"), "mods": mods_schema()}), &["kind", "x", "y"])}, "mods": mods_schema()}),
+                json!({"events": {"type": "array", "items": obj(json!({"kind": string("down|drag|up|move|doubleclick|tripleclick|contextclick"), "x": num("x (pt)"), "y": num("y (pt)"), "mods": mods_schema()}), &["kind", "x", "y"])}, "mods": mods_schema()}),
                 &["events"],
             ),
             false,
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..1691286f 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -376,7 +376,11 @@ fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
     if resp.hovered() && !app.session.tool.dragging() {
         let _ = app.session.pointer(ev(PointerKind::Move));
     }
-    let r = if resp.triple_clicked() {
+    let secondary = resp.hovered() && ui.input(|i| i.pointer.button_pressed(egui::PointerButton::Secondary));
+    let r = if secondary && !app.session.tool.dragging() {
+        // Select what's under the pointer before the context menu opens (on release).
+        app.session.pointer(ev(PointerKind::ContextClick))
+    } else if resp.triple_clicked() {
         app.session.pointer(ev(PointerKind::TripleClick))
     } else if resp.double_clicked() {
         app.session.pointer(ev(PointerKind::DoubleClick))
@@ -630,7 +634,29 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
             }
         }
         ui.separator();
-        if has_sel {
+        // Right-clicking the text being edited keeps it (`PointerKind::ContextClick`): text items.
+        let editing = app.session.active().is_some_and(|d| d.selection.text.as_ref().is_some_and(|t| !t.notes));
+        if editing {
+            if ui.button("Paragraph…").clicked() {
+                app.dialog = Some(crate::dialogs::Dialog::new("paragraph"));
+                ui.close();
+            }
+            for (l, id) in [("Bullets", "format.bullets"), ("Numbering", "format.numbering")] {
+                if ui.add_enabled(crate::ribbon::enabled(app, id), egui::Button::new(l)).clicked() {
+                    let _ = app.run(id, json!({}));
+                    ui.close();
+                }
+            }
+            if ui.button("Link…").clicked() {
+                app.dialog = Some(crate::dialogs::Dialog::new("hyperlink"));
+                ui.close();
+            }
+            ui.separator();
+            if ui.button("Format Shape…").clicked() {
+                let _ = app.run("view.pane", json!({"pane": "format"}));
+                ui.close();
+            }
+        } else if has_sel {
             if ui.button("Edit Text").clicked() {
                 let _ = app.run("text.edit", json!({}));
                 ui.close();
diff --git a/crates/ui-egui/src/control.rs b/crates/ui-egui/src/control.rs
index d344d912..c66a0ea0 100644
--- a/crates/ui-egui/src/control.rs
+++ b/crates/ui-egui/src/control.rs
@@ -342,6 +342,7 @@ fn deckcraft_mcp_kind(k: &str) -> Option<deckcraft_engine::PointerKind> {
         "move" => Move,
         "doubleclick" | "dblclick" => DoubleClick,
         "tripleclick" => TripleClick,
+        "contextclick" | "rightclick" => ContextClick,
         _ => return None,
     })
 }
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 07741fde..6c2d2ffe 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -17,7 +17,7 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `document.inspect` | — | Slides, sections, layouts, shapes, selection |
 | `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state, documents, perf (fps, render ms) |
 | `ui.tool.select` | `{tool, preset?}` | `select`, `text`, `shape` + preset, any preset name, `curve`, `freeform`, `scribble`, `pen`, `highlighter`, `eraser` |
-| `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
+| `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick\|contextclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse (`contextclick`: the right-button press that selects before the context menu) |
 | `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show) |
 | `ui.ime` | `{preedit, active?: [start, end]}` / `{commit}` | An input method's composition through egui, as a real one arrives: shown in place on the slide or in a focused field; `{"preedit": ""}` cancels |
 | `ui.move` / `ui.click` / `ui.drag` | screen points | Real egui pointer input — reaches every widget, menu and pane |

From 09d6a6c71561419786fec6136159370d7318cf3e Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:37:39 +0200
Subject: [PATCH 076/376] Progress docs: right click selects the shape under
 the pointer

- ui-parity.md: context menu row; status line and history.
- ROADMAP.md: progress log line. No checklist row changes score; no gaps.md entry covered this.
---
 ROADMAP.md        | 3 ++-
 docs/ui-parity.md | 5 +++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 2dba0e27..5e7d02b7 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (right click selects; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-12 | Canvas: a right click selects the shape under the pointer before the context menu opens (`contextclick` pointer kind for the control channel and MCP); in edited text the menu offers text items |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..c00df639 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (right click selects the shape under the pointer; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -83,7 +83,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
 | Exact size/position, lock aspect | yes | yes |
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
-| Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
+| Context menus on shapes, slides, text, thumbnails | yes | yes, shorter; a right click selects the shape under the pointer first |
 | Drag and drop of files and between thumbnails | yes | yes |
 | Image paste from the clipboard | yes | macOS yes; Windows and Linux no (#53) |
 | Font menu: every installed family with its faces | yes | families yes; only Regular/Bold/Italic faces (#69) |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | A right click selects the shape under the pointer before its context menu opens, as in PowerPoint; edited text keeps its selection and gets text items |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 7812c77cf39e11ca7855bb132deb55b74f4bc556 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:49:27 +0200
Subject: [PATCH 077/376] Title bar: Export button next to Save
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The Export dialog had no visible control: the native menu bar that lists
Export… is not installed, so only the command palette reached it. The
quick access row now has an Export button (the existing Export icon)
that opens the export dialog, enabled when a presentation is open.
---
 crates/ui-egui/src/lib.rs    | 22 ++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..22ad8f19 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1299,6 +1299,28 @@ mod tests {
         assert!(size(&mut harness).unwrap_or(f64::MAX) < after, "Ctrl+[ shrinks");
     }
 
+    /// Export… had no visible control: only the command palette reached it.
+    #[test]
+    fn title_bar_export_opens_the_export_dialog() {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        assert!(harness.state().dialog.is_none());
+        // Quick access: Home, Save, Export, each 24 points wide with 2 between, from x = 10.
+        let pos = egui::pos2(10.0 + 2.0 * 26.0 + 12.0, ribbon::TITLE_H / 2.0);
+        harness.hover_at(pos);
+        harness.run_steps(1);
+        harness.event(egui::Event::PointerButton { pos, button: egui::PointerButton::Primary, pressed: true, modifiers: egui::Modifiers::NONE });
+        harness.event(egui::Event::PointerButton { pos, button: egui::PointerButton::Primary, pressed: false, modifiers: egui::Modifiers::NONE });
+        harness.run_steps(2);
+        assert_eq!(harness.state().dialog.as_ref().map(|d| d.id.as_str()), Some("export"));
+    }
+
     #[test]
     fn home_needs_an_open_presentation() {
         let mut app = SlideApp::new(Session::new(), Services::default());
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 8e847928..cf065954 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -53,6 +53,9 @@ pub fn title_bar(app: &mut SlideApp, ui: &mut Ui) {
         if icon_toggle(&mut child, Icon::Save, "Save (⌘S)", has_doc, false).clicked() {
             app.save();
         }
+        if icon_toggle(&mut child, Icon::Export, "Export…", has_doc, false).clicked() {
+            let _ = app.run("app.exportDialog", json!({}));
+        }
         if icon_toggle(&mut child, Icon::Undo, "Undo (⌘Z)", enabled(app, "edit.undo"), false).clicked() {
             run(app, "edit.undo", json!({}));
         }

From 71ddbc59dc3c71108a091fe47ba0560948340497 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:49:28 +0200
Subject: [PATCH 078/376] Progress docs: Export button in the title bar

- ui-parity.md: title bar row; status line and history.
- ROADMAP.md: progress log line. Quick Access toolbar / title bar commands stays P (no
  customization); no gaps.md entry covered this.
---
 ROADMAP.md        | 3 ++-
 docs/ui-parity.md | 5 +++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 2dba0e27..e469e275 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (title bar Export button; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-12 | Title bar: Export button next to Save, opening the Export dialog on every platform (a shortcut beside File › Export) |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..b221a9ad 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (Export button in the title bar; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -13,7 +13,7 @@ AGENTS.md §2). Dimension score: **~60% ready** (estimated), **30–50 h** to pa
 
 | Element | PowerPoint for Mac | DeckCraft | Gap |
 |---|---|---|---|
-| Title bar: AutoSave, Home, Save, Undo/Redo, document title, Share, search | yes | yes, no Share (cloud) | #71 macOS window controls misaligned |
+| Title bar: AutoSave, Home, Save, Undo/Redo, document title, Share, search | yes | yes, plus Export; no Share (cloud) | #71 macOS window controls misaligned |
 | Native macOS menu bar (File, Edit, View, Insert, Format, Arrange, Tools, Slide Show, Window, Help) | yes | **no** (`menus::menu_tree()` is defined but not installed) | 3–5 h |
 | Menu-bar items with a DeckCraft equivalent | 217 app-specific items | 128 matched by name (59%, heuristic lower bound) | See [target-app-parity.md](target-app-parity.md) |
 | Ribbon tabs: Home, Insert, Draw, Design, Transitions, Animations, Slide Show, Record, Review, View | 10 | 10 | Record tab is a placeholder |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | Title bar: an Export button next to Save opens the Export dialog, a quick-access shortcut beside File › Export |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From b5a864241733b4a7cc29fe50b029c2146254c72b Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:19:41 +0200
Subject: [PATCH 079/376] Tables: show the caret and text selection in the cell
 being edited

Editing a table cell outlined the cell but drew no caret or selection,
and Up/Down/Home/End fell back to paragraph moves, because the text
layout used for drawing, hit testing and caret movement only existed
for shapes.

text::text_frame now lays out the edited text as it is drawn and gives
the transform to the slide, for shapes and cells alike: a cell's text is
laid out in its rect (merges honoured) with the cell's margins, anchor
and the table style's look, through the renderer's own cell_body and
cell_rects. layout_for and tools::text_pos use it, and the canvas draws
the caret and selection from it. The cell outline follows merged cells.
---
 crates/engine/src/cmd/table.rs |  39 ++++++++++-
 crates/engine/src/cmd/text.rs  |  67 ++++++++++++++-----
 crates/engine/src/tests.rs     |  65 +++++++++++++++++++
 crates/engine/src/tools.rs     |  13 +---
 crates/render/src/lib.rs       |   2 +-
 crates/render/src/table.rs     |   2 +-
 crates/ui-egui/src/canvas.rs   | 115 ++++++++++++++++++++++++++-------
 7 files changed, 247 insertions(+), 56 deletions(-)

diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index e9f6f164..a8476e6b 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -1,10 +1,11 @@
 //! Table Design and Table Layout tabs.
 
-use deckcraft_model::{ShapeKind, Table};
+use deckcraft_geom::{Affine, Point, Rect};
+use deckcraft_model::{Shape, ShapeKind, Table};
 use serde_json::{Value, json};
 
 use super::*;
-use crate::{Result, Session};
+use crate::{DocState, Result, Session};
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![
@@ -65,6 +66,40 @@ pub fn specs() -> Vec<CommandSpec> {
     ]
 }
 
+/// A table as drawn on the slide: where it is, its drawn row heights and its visible cells.
+#[derive(Clone, Debug)]
+pub struct TableFrame {
+    /// Table-local (points from the table's top-left corner) → slide space, as the table is drawn.
+    pub affine: Affine,
+    pub cols: Vec<f64>,
+    /// Row heights as drawn: a stored height is a minimum, rows grow to fit their text.
+    pub heights: Vec<f64>,
+    /// Visible cells (merges honoured): (row, col, table-local rect).
+    pub cells: Vec<(usize, usize, Rect)>,
+}
+
+/// The drawn geometry of table shape `sh` on the edited slide (`None` if it isn't a table).
+pub fn table_frame(st: &DocState, sh: &Shape) -> Option<TableFrame> {
+    let ShapeKind::Table(t) = &sh.kind else { return None };
+    // The table is drawn in its own box; rows that grow past it don't move it.
+    let x = sh.xfrm.unwrap_or_else(|| xfrm_of(&st.doc, &st.selection, sh));
+    let heights = table_drawn_heights(&st.doc, &st.selection, t);
+    let cells = deckcraft_render::table_cell_rects(t, &heights);
+    Some(TableFrame { affine: x.affine(), cols: t.cols.clone(), heights, cells })
+}
+
+impl TableFrame {
+    /// Table-local point for slide point `p`.
+    pub fn local(&self, p: Point) -> Point {
+        self.affine.inverse() * p
+    }
+
+    /// Table-local rect of visible cell (`r`, `c`).
+    pub fn cell_rect(&self, r: usize, c: usize) -> Option<Rect> {
+        self.cells.iter().find(|(cr, cc, _)| (*cr, *cc) == (r, c)).map(|x| x.2)
+    }
+}
+
 fn cell_param(p: &Value, key: &str) -> Option<(usize, usize)> {
     let a = p.get(key)?.as_array()?;
     Some((a.first()?.as_u64()? as usize, a.get(1)?.as_u64()? as usize))
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..cd69adbf 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -2,10 +2,11 @@
 
 use std::sync::Arc;
 
+use deckcraft_geom::{Affine, Point, Rect};
 use deckcraft_model::edit::{self as ed, Pos};
 use deckcraft_model::resolve::{self, Ctx};
 use deckcraft_model::text::{AutoFit, Hyperlink, Run, RunKind, RunProps, TextBody};
-use deckcraft_model::{Presentation, ShapeId, ShapeKind};
+use deckcraft_model::{Presentation, Shape, ShapeId, ShapeKind};
 use serde_json::{Value, json};
 
 use super::*;
@@ -159,20 +160,50 @@ pub(crate) fn ctx_for<'a>(doc: &'a Presentation, sel: &Selection) -> Option<Ctx<
 
 /// Lay out the text being edited (for vertical caret movement and hit testing).
 pub fn layout_for(st: &DocState, t: &TextSel) -> Option<deckcraft_text::TextLayout> {
-    if t.notes || t.cell.is_some() {
+    text_frame(st, t).map(|f| f.0)
+}
+
+/// The text being edited as it is drawn: its layout, and the transform from layout space to the
+/// slide (flips don't mirror text, vertical text is turned). Shapes and table cells alike; the
+/// caret, the text selection, hit testing and caret movement all use it. `None` for notes.
+pub fn text_frame(st: &DocState, t: &TextSel) -> Option<(deckcraft_text::TextLayout, Affine)> {
+    if t.notes {
         return None;
     }
     let sh = st.shape(t.shape)?;
-    let body = sh.text.as_ref()?;
     let ctx = ctx_for(&st.doc, &st.selection)?;
+    let lay = |s: &Shape, body: &TextBody, rect: Rect| {
+        deckcraft_text::layout(&ctx, s, body, &deckcraft_text::Opts { rect, fields: &deckcraft_text::NoFields, prompt_color: None, no_shrink: false })
+    };
+    if let Some((r, c)) = t.cell {
+        // A cell's text is laid out in the cell's rect with the cell's margins, anchor and the
+        // table style's text look, exactly as the table draws it.
+        let ShapeKind::Table(tb) = &sh.kind else { return None };
+        let frame = super::table::table_frame(st, sh)?;
+        let rect = frame.cell_rect(r, c)?;
+        let body = deckcraft_render::table_cell_body(&ctx, tb, r, c, tb.cell(r, c)?);
+        let tmp = Shape { text: Some(body.clone()), ..Default::default() };
+        let l = lay(&tmp, &body, rect);
+        let m = deckcraft_render::text_transform(frame.affine, rect, l.rotation);
+        return Some((l, m));
+    }
+    let body = sh.text.as_ref()?;
     let x = xfrm_of(&st.doc, &st.selection, sh);
-    let geo = deckcraft_render::shape_geometry(sh, x.w, x.h);
-    Some(deckcraft_text::layout(
-        &ctx,
-        sh,
-        body,
-        &deckcraft_text::Opts { rect: geo.text_rect, fields: &deckcraft_text::NoFields, prompt_color: None, no_shrink: false },
-    ))
+    let tr = deckcraft_render::shape_geometry(sh, x.w, x.h).text_rect;
+    let l = lay(sh, body, tr);
+    let m = deckcraft_render::text_transform(x.affine(), tr, l.rotation);
+    Some((l, m))
+}
+
+/// The text position under slide point `p` in the text being edited (its shape or cell).
+pub fn text_pos_at(st: &DocState, t: &TextSel, p: Point) -> Pos {
+    match text_frame(st, t) {
+        Some((l, m)) => {
+            let h = l.hit(m.inverse() * p);
+            (h.para, h.ch)
+        }
+        None => (0, 0),
+    }
 }
 
 /// The insertion point on the slide: its line from top to bottom, in slide coordinates (flips and
@@ -180,9 +211,16 @@ pub fn layout_for(st: &DocState, t: &TextSel) -> Option<deckcraft_text::TextLayo
 /// measured as one empty paragraph, so the caret shows where typing begins. `None` for notes and
 /// table cells, which aren't laid out on the slide here.
 pub fn caret_line(st: &DocState, t: &TextSel) -> Option<(deckcraft_geom::Point, deckcraft_geom::Point)> {
-    if t.notes || t.cell.is_some() {
+    if t.notes {
         return None;
     }
+    // A table cell: where the cell's text is drawn.
+    if t.cell.is_some() {
+        let (l, m) = text_frame(st, t)?;
+        let aff = if t.at_line_end() { deckcraft_text::Affinity::Upstream } else { deckcraft_text::Affinity::Downstream };
+        let (cx, top, bot) = l.caret_drawn(deckcraft_text::Pos { para: t.caret.0, ch: t.caret.1 }, aff)?;
+        return Some((m * deckcraft_geom::Point::new(cx, top), m * deckcraft_geom::Point::new(cx, bot)));
+    }
     let sh = st.shape(t.shape)?;
     let ctx = ctx_for(&st.doc, &st.selection)?;
     let x = xfrm_of(&st.doc, &st.selection, sh);
@@ -487,11 +525,8 @@ fn commit(s: &mut Session, p: &Value) -> Result<Value> {
 /// the edited text isn't laid out on the slide (notes, table cells).
 pub fn composition_underlines(st: &DocState) -> Vec<(deckcraft_geom::Point, deckcraft_geom::Point, bool)> {
     let (Some(c), Some(t)) = (&st.composition, &st.selection.text) else { return vec![] };
-    let Some(sh) = st.shape(t.shape) else { return vec![] };
-    let Some(l) = layout_for(st, t) else { return vec![] };
-    let x = xfrm_of(&st.doc, &st.selection, sh);
-    let tr = deckcraft_render::shape_geometry(sh, x.w, x.h).text_rect;
-    let m = deckcraft_render::text_transform(x.affine(), tr, l.rotation);
+    // Where the text is drawn, in a shape or a table cell.
+    let Some((l, m)) = text_frame(st, t) else { return vec![] };
     let pos = |ch: usize| deckcraft_text::Pos { para: c.start.0, ch: c.start.1 + ch };
     let mut out = vec![];
     let mut add = |a: usize, b: usize, thick: bool| {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..10630add 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -401,6 +401,71 @@ fn grown_table_frame_covers_its_drawn_rows() {
     assert!(matches!(s.hit_test(below_stored, 1.0), Some(tools::Hit::Shape { .. })));
 }
 
+/// A table at (100, 100): columns `cols` wide, rows 40 pt tall, cells holding `data`.
+fn table_at(s: &mut Session, cols: &[f64], data: serde_json::Value) -> deckcraft_model::ShapeId {
+    let rows = data.as_array().map_or(1, Vec::len);
+    let w: f64 = cols.iter().sum();
+    let r =
+        s.execute("insert.table", &json!({"rows": rows, "cols": cols.len(), "rect": [100.0, 100.0, w, 40.0 * rows as f64], "data": data})).unwrap();
+    let id = deckcraft_model::ShapeId(r["id"].as_u64().unwrap() as u32);
+    for (c, cw) in cols.iter().enumerate() {
+        s.execute("table.columnWidth", &json!({"id": id, "col": c, "width": cw})).unwrap();
+    }
+    s.execute("edit.deselect", &json!({})).unwrap();
+    id
+}
+
+fn text_sel(s: &Session) -> Option<TextSel> {
+    s.doc().unwrap().selection.text.clone()
+}
+
+/// Slide point of the caret before character `ch` of paragraph `para` in the text being edited.
+fn caret_point(s: &Session, para: usize, ch: usize) -> deckcraft_geom::Point {
+    let st = s.doc().unwrap();
+    text_point(st, st.selection.text.as_ref().unwrap(), para, ch)
+}
+
+/// Slide point of the caret before character `ch` of paragraph `para` of text `t`.
+fn text_point(st: &DocState, t: &TextSel, para: usize, ch: usize) -> deckcraft_geom::Point {
+    let (l, m) = cmd::text::text_frame(st, t).unwrap();
+    let (x, top, bot) = l.caret(deckcraft_text::Pos { para, ch }).unwrap();
+    m * deckcraft_geom::Point::new(x, (top + bot) / 2.0)
+}
+
+#[test]
+fn cell_text_is_laid_out_where_the_cell_draws_it() {
+    // The caret and hit testing of a cell's text use the cell's rect, not the table's.
+    let mut s = session();
+    let id = table_at(&mut s, &[200.0, 200.0], json!([["Hello world", "b"], ["c", ""]]));
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 1], "at": [0, 0]})).unwrap();
+    let c = caret_point(&s, 0, 0);
+    assert!(c.x > 300.0 && c.x < 320.0 && c.y > 100.0 && c.y < 140.0, "caret of cell (0, 1) at {c:?}");
+    // An empty cell still has a caret.
+    s.execute("text.edit", &json!({"id": id, "cell": [1, 1]})).unwrap();
+    let c = caret_point(&s, 0, 0);
+    assert!(c.x > 300.0 && c.y > 140.0 && c.y < 180.0, "caret of empty cell (1, 1) at {c:?}");
+    // Hit testing: the start and the end of "Hello world".
+    let st = s.doc().unwrap();
+    let t = TextSel { shape: id, cell: Some((0, 0)), ..Default::default() };
+    assert_eq!(cmd::text::text_pos_at(st, &t, deckcraft_geom::Point::new(101.0, 115.0)), (0, 0));
+    assert_eq!(cmd::text::text_pos_at(st, &t, deckcraft_geom::Point::new(295.0, 115.0)), (0, 11));
+}
+
+#[test]
+fn caret_moves_by_line_in_a_wrapped_cell() {
+    let mut s = session();
+    let id = table_at(&mut s, &[90.0, 200.0], json!([["one two three four five six seven", "b"]]));
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 0], "at": [0, 0]})).unwrap();
+    s.execute("text.move", &json!({"to": "down"})).unwrap();
+    let down = text_sel(&s).unwrap().caret;
+    assert!(down.0 == 0 && down.1 > 0, "down goes to the next line of the paragraph: {down:?}");
+    s.execute("text.move", &json!({"to": "lineEnd"})).unwrap();
+    let end = text_sel(&s).unwrap().caret;
+    assert!(end.1 > down.1 && end.1 < 33, "end of the second line: {end:?}");
+    s.execute("text.move", &json!({"to": "up"})).unwrap();
+    assert!(text_sel(&s).unwrap().caret.1 < down.1);
+}
+
 #[test]
 fn right_to_left_paragraphs() {
     let mut s = session();
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..c684dc68 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -1273,18 +1273,7 @@ fn hit_shape(st: &crate::DocState, sh: &Shape, p: Point, tol: f64) -> Option<Hit
 
 /// Text position under slide point `p` in shape `sh`.
 pub fn text_pos(st: &crate::DocState, sh: &Shape, p: Point) -> (usize, usize) {
-    let x = xfrm_of(&st.doc, &st.selection, sh);
-    let t = TextSel { shape: sh.id, ..Default::default() };
-    match cmd::text::layout_for(st, &t) {
-        Some(l) => {
-            // The text's own transform: flips don't mirror text, vertical text is turned.
-            let tr = deckcraft_render::shape_geometry(sh, x.w, x.h).text_rect;
-            let local = deckcraft_render::text_transform(x.affine(), tr, l.rotation).inverse() * p;
-            let h = l.hit(local);
-            (h.para, h.ch)
-        }
-        None => (0, 0),
-    }
+    cmd::text::text_pos_at(st, &TextSel { shape: sh.id, ..Default::default() }, p)
 }
 
 /// Row heights of table `t` as drawn: rows grow to fit their text.
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index 47a0f1e2..6b084ecf 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -46,7 +46,7 @@ pub use images::{decode as decode_image, gif_frame};
 pub use morph_path::PathMorph;
 pub use morph_text::TextMorph;
 pub use placed::{Placed, PlacedLink, PlacedText, place_slide};
-pub use table::row_heights as table_row_heights;
+pub use table::{cell_body as table_cell_body, cell_rects as table_cell_rects, row_heights as table_row_heights};
 
 /// Largest pixmap side we render (vello_cpu uses u16 sizes).
 pub const MAX_SIDE: u32 = 16_000;
diff --git a/crates/render/src/table.rs b/crates/render/src/table.rs
index 685df6f9..929a87a6 100644
--- a/crates/render/src/table.rs
+++ b/crates/render/src/table.rs
@@ -224,7 +224,7 @@ fn edges(sizes: &[f64]) -> Vec<f64> {
 }
 
 /// A cell's text as drawn: its margins, anchor and direction, plus the table style's text colour and bold.
-pub(crate) fn cell_body(rctx: &Ctx, t: &Table, r: usize, c: usize, cell: &Cell) -> TextBody {
+pub fn cell_body(rctx: &Ctx, t: &Table, r: usize, c: usize, cell: &Cell) -> TextBody {
     let lk = look(rctx, t, r, c);
     let mut body = cell.text.clone();
     let [ml, mr, mt, mb] = cell.margins.unwrap_or([7.2, 7.2, 3.6, 3.6]);
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..e853130c 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -486,21 +486,10 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
             }
         }
     }
-    // Caret / text selection.
-    if let Some(ts) = &editing
-        && !ts.notes
-        && ts.cell.is_none()
-        && let Some(sh) = st.shape(ts.shape)
-        && let Some(l) = deckcraft_engine::cmd::text::layout_for(st, ts)
-    {
-        let x = deckcraft_engine::cmd::xfrm_of(&st.doc, &st.selection, sh);
-        // Where the text is drawn: flips don't mirror it, vertical text is turned.
-        let tr = deckcraft_render::shape_geometry(sh, x.w, x.h).text_rect;
-        let m = deckcraft_render::text_transform(x.affine(), tr, l.rotation);
-        let (s0, s1) = ts.ordered();
-        for r in l.selection_rects(deckcraft_text::Pos { para: s0.0, ch: s0.1 }, deckcraft_text::Pos { para: s1.0, ch: s1.1 }) {
-            let pts = [Point::new(r.x0, r.y0), Point::new(r.x1, r.y0), Point::new(r.x1, r.y1), Point::new(r.x0, r.y1)].map(|q| xf.to_screen(m * q));
-            painter.add(egui::Shape::convex_polygon(pts.to_vec(), t.text_selection, Stroke::NONE));
+    // Caret / text selection, in a shape or a table cell.
+    if let Some(ts) = &editing {
+        for quad in text_marks(st, ts).iter().flat_map(|m| &m.selection) {
+            painter.add(egui::Shape::convex_polygon(quad.iter().map(|q| xf.to_screen(*q)).collect(), t.text_selection, Stroke::NONE));
         }
         // An input method's composition: underlined in place, thicker under the part being converted.
         for (a, b, thick) in deckcraft_engine::cmd::text::composition_underlines(st) {
@@ -515,18 +504,14 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
             }
         }
     }
-    // Table cell editing: outline the cell.
+    // Table cell editing: outline the cell (merged cells as drawn).
     if let Some(ts) = &editing
         && let (Some((r, c)), Some(sh)) = (ts.cell, st.shape(ts.shape))
-        && let deckcraft_model::ShapeKind::Table(tb) = &sh.kind
+        && let Some(f) = deckcraft_engine::cmd::table::table_frame(st, sh)
+        && let Some(cr) = f.cell_rect(r, c)
     {
-        let x = deckcraft_engine::cmd::xfrm_of(&st.doc, &st.selection, sh);
-        let heights = deckcraft_engine::tools::table_rows(st, tb);
-        let y0: f64 = heights.iter().take(r).sum();
-        let x0: f64 = tb.cols.iter().take(c).sum();
-        let (w, h) = (tb.cols.get(c).copied().unwrap_or(0.0), heights.get(r).copied().unwrap_or(0.0));
-        let a = x.affine();
-        let pts = [Point::new(x0, y0), Point::new(x0 + w, y0), Point::new(x0 + w, y0 + h), Point::new(x0, y0 + h)].map(|q| xf.to_screen(a * q));
+        let pts = [Point::new(cr.x0, cr.y0), Point::new(cr.x1, cr.y0), Point::new(cr.x1, cr.y1), Point::new(cr.x0, cr.y1)]
+            .map(|q| xf.to_screen(f.affine * q));
         poly(painter, pts, Stroke::new(2.0, t.accent));
     }
     // Smart guides, marquee, previews.
@@ -588,6 +573,24 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
     }
 }
 
+/// The text selection (quads) of the text being edited, in slide space: in a shape or a table
+/// cell, wherever its text is drawn. The caret is `cmd::text::caret_line`.
+pub(crate) struct TextMarks {
+    pub selection: Vec<[Point; 4]>,
+}
+
+pub(crate) fn text_marks(st: &deckcraft_engine::DocState, ts: &deckcraft_engine::TextSel) -> Option<TextMarks> {
+    let (l, m) = deckcraft_engine::cmd::text::text_frame(st, ts)?;
+    let pos = |p: (usize, usize)| deckcraft_text::Pos { para: p.0, ch: p.1 };
+    let (s0, s1) = ts.ordered();
+    let selection = l
+        .selection_rects(pos(s0), pos(s1))
+        .into_iter()
+        .map(|r| [Point::new(r.x0, r.y0), Point::new(r.x1, r.y0), Point::new(r.x1, r.y1), Point::new(r.x0, r.y1)].map(|q| m * q))
+        .collect();
+    Some(TextMarks { selection })
+}
+
 fn rotate_handle(p: &egui::Painter, c: Pos2, t: &Tokens) {
     p.circle_filled(c, 6.0, t.handle_fill);
     p.add(egui::Shape::Path(egui::epaint::PathShape {
@@ -697,3 +700,67 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
         }
     });
 }
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used)]
+
+    use deckcraft_engine::Session;
+
+    use super::*;
+    use crate::Services;
+
+    fn app_with_table() -> (egui_kittest::Harness<'static, SlideApp>, deckcraft_model::ShapeId) {
+        let mut s = Session::with_new();
+        let data = json!([["Hello world", "b"], ["c", ""]]);
+        let r = s.execute("insert.table", &json!({"rows": 2, "cols": 2, "rect": [100.0, 100.0, 400.0, 80.0], "data": data})).unwrap();
+        let id = deckcraft_model::ShapeId(r["id"].as_u64().unwrap() as u32);
+        s.execute("edit.deselect", &json!({})).unwrap();
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(s, Services::default()),
+        );
+        // The app keeps requesting repaints, so step frames instead of run().
+        harness.run_steps(2);
+        (harness, id)
+    }
+
+    /// Screen position of slide point (x, y).
+    fn screen(app: &SlideApp, x: f64, y: f64) -> Pos2 {
+        Xf { origin: app.slide_rect.unwrap().min, scale: app.canvas_scale }.to_screen(Point::new(x, y))
+    }
+
+    /// Press and release at `p`, 50 ms apart in input time (two clicks make a double-click).
+    fn click(harness: &mut egui_kittest::Harness<'static, SlideApp>, p: Pos2) {
+        for pressed in [true, false] {
+            let t = harness.ctx.input(|i| i.time) + 0.05;
+            harness.input_mut().time = Some(t);
+            harness.event(egui::Event::PointerButton { pos: p, button: egui::PointerButton::Primary, pressed, modifiers: egui::Modifiers::NONE });
+            harness.step();
+        }
+    }
+
+    /// Double-clicking a table cell edits it with the caret drawn in that cell.
+    #[test]
+    fn double_click_in_a_table_cell_shows_the_caret_there() {
+        let (mut harness, id) = app_with_table();
+        // The empty cell (1, 1) spans x 300..500, y 140..180.
+        let p = screen(harness.state(), 400.0, 160.0);
+        harness.hover_at(p);
+        harness.step();
+        click(&mut harness, p);
+        click(&mut harness, p);
+        harness.run_steps(2);
+        let st = harness.state().session.active().unwrap();
+        let ts = st.selection.text.clone().expect("editing the cell");
+        assert_eq!((ts.shape, ts.cell), (id, Some((1, 1))));
+        assert!(text_marks(st, &ts).is_some_and(|m| m.selection.is_empty()), "no range");
+        let (top, bottom) = deckcraft_engine::cmd::text::caret_line(st, &ts).expect("the cell's text has a caret");
+        for q in [top, bottom] {
+            assert!(q.x > 300.0 && q.x < 500.0 && q.y >= 140.0 && q.y <= 180.0, "caret {q:?} outside cell (1, 1)");
+        }
+    }
+}

From 70314fa82822cf37f9b6503de823eee563e9420c Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:19:42 +0200
Subject: [PATCH 080/376] Tables: clicks place the caret in the clicked cell

- A double-click in a cell puts the caret where clicked and selects the
  word there, as in shapes (it used to put the caret at the end).
- While a cell is edited, a click in the same table moves the caret to
  the clicked cell and position; a drag selects text within the cell
  and Shift+click extends only within it.
- A click in an already selected table enters the clicked cell at the
  click; dragging the table still moves it.
- The release that follows a double-click no longer re-enters the text
  at the click, which collapsed the word just selected (shapes too).

Cells are found from the drawn cell rects, so merged cells and rows
that grew to fit their text are hit where they are drawn.
---
 crates/engine/src/cmd/table.rs |  20 +++++
 crates/engine/src/tests.rs     | 103 +++++++++++++++++++++++
 crates/engine/src/tools.rs     | 147 ++++++++++++++++++---------------
 crates/ui-egui/src/canvas.rs   |  11 ++-
 4 files changed, 212 insertions(+), 69 deletions(-)

diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index a8476e6b..4c46eb5f 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -89,6 +89,14 @@ pub fn table_frame(st: &DocState, sh: &Shape) -> Option<TableFrame> {
 }
 
 impl TableFrame {
+    pub fn width(&self) -> f64 {
+        self.cols.iter().map(|w| w.max(0.0)).sum()
+    }
+
+    pub fn height(&self) -> f64 {
+        self.heights.iter().map(|h| h.max(0.0)).sum()
+    }
+
     /// Table-local point for slide point `p`.
     pub fn local(&self, p: Point) -> Point {
         self.affine.inverse() * p
@@ -98,6 +106,18 @@ impl TableFrame {
     pub fn cell_rect(&self, r: usize, c: usize) -> Option<Rect> {
         self.cells.iter().find(|(cr, cc, _)| (*cr, *cc) == (r, c)).map(|x| x.2)
     }
+
+    /// The visible cell at table-local point `p` (points outside the table go to the nearest cell).
+    pub fn cell_at(&self, p: Point) -> Option<(usize, usize)> {
+        let q = Point::new(p.x.clamp(0.0, self.width().max(0.0)), p.y.clamp(0.0, self.height().max(0.0)));
+        let inside = |r: &Rect| q.x >= r.x0 && q.x <= r.x1 && q.y >= r.y0 && q.y <= r.y1;
+        // Edges are shared: prefer the cell the point is strictly inside.
+        self.cells
+            .iter()
+            .find(|(_, _, r)| q.x >= r.x0 && q.x < r.x1 && q.y >= r.y0 && q.y < r.y1)
+            .or_else(|| self.cells.iter().rev().find(|(_, _, r)| inside(r)))
+            .map(|(r, c, _)| (*r, *c))
+    }
 }
 
 fn cell_param(p: &Value, key: &str) -> Option<(usize, usize)> {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 10630add..69d3bc68 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -415,6 +415,17 @@ fn table_at(s: &mut Session, cols: &[f64], data: serde_json::Value) -> deckcraft
     id
 }
 
+fn table_of(s: &Session, id: deckcraft_model::ShapeId) -> deckcraft_model::Table {
+    match &s.doc().unwrap().shape(id).unwrap().kind {
+        deckcraft_model::ShapeKind::Table(t) => t.clone(),
+        k => panic!("not a table: {k:?}"),
+    }
+}
+
+fn tev(kind: PointerKind, x: f64, y: f64) -> PointerEvent {
+    PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0 }
+}
+
 fn text_sel(s: &Session) -> Option<TextSel> {
     s.doc().unwrap().selection.text.clone()
 }
@@ -451,6 +462,86 @@ fn cell_text_is_laid_out_where_the_cell_draws_it() {
     assert_eq!(cmd::text::text_pos_at(st, &t, deckcraft_geom::Point::new(295.0, 115.0)), (0, 11));
 }
 
+#[test]
+fn double_click_in_a_cell_selects_the_word_clicked() {
+    let mut s = session();
+    let id = table_at(&mut s, &[200.0, 200.0], json!([["Hello world", "b"], ["c", "d"]]));
+    // Where "world" is drawn.
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 0]})).unwrap();
+    let p = caret_point(&s, 0, 8);
+    s.execute("text.exit", &json!({})).unwrap();
+    s.execute("edit.deselect", &json!({})).unwrap();
+    // As the UI sends it: press, release, press, double-click (on release), then the release.
+    s.pointer(tev(PointerKind::Down, p.x, p.y)).unwrap();
+    s.pointer(tev(PointerKind::Up, p.x, p.y)).unwrap();
+    assert!(text_sel(&s).is_none(), "a click on an unselected table selects it");
+    s.pointer(tev(PointerKind::Down, p.x, p.y)).unwrap();
+    s.pointer(tev(PointerKind::DoubleClick, p.x, p.y)).unwrap();
+    s.pointer(tev(PointerKind::Up, p.x, p.y)).unwrap();
+    let t = text_sel(&s).unwrap();
+    assert_eq!((t.cell, t.ordered()), (Some((0, 0)), ((0, 6), (0, 11))), "the word under the double-click");
+    // The control channel sends the double-click alone.
+    s.execute("text.exit", &json!({})).unwrap();
+    s.execute("edit.deselect", &json!({})).unwrap();
+    s.pointer(tev(PointerKind::DoubleClick, p.x, p.y)).unwrap();
+    assert_eq!(text_sel(&s).map(|t| t.ordered()), Some(((0, 6), (0, 11))));
+}
+
+#[test]
+fn clicks_while_editing_a_cell_move_the_caret_between_cells() {
+    let mut s = session();
+    let id = table_at(&mut s, &[200.0, 200.0], json!([["Hello world", "Second cell"], ["c", "d"]]));
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 1], "at": [0, 0]})).unwrap();
+    let p6 = caret_point(&s, 0, 6);
+    let p11 = caret_point(&s, 0, 11);
+    s.execute("text.edit", &json!({"id": id, "cell": [1, 0]})).unwrap();
+    // A click in another cell of the table moves the caret there, at the click.
+    s.pointer(tev(PointerKind::Down, p6.x, p6.y)).unwrap();
+    let t = text_sel(&s).unwrap();
+    assert_eq!((t.shape, t.cell, t.caret, t.anchor), (id, Some((0, 1)), (0, 6), (0, 6)));
+    // Dragging selects within that cell, even past its edge.
+    s.pointer(tev(PointerKind::Drag, p11.x, p11.y)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 600.0, p11.y)).unwrap();
+    s.pointer(tev(PointerKind::Up, 600.0, p11.y)).unwrap();
+    let t = text_sel(&s).unwrap();
+    assert_eq!((t.cell, t.ordered()), (Some((0, 1)), ((0, 6), (0, 11))));
+    // Shift+click in another cell starts a new caret there instead of extending across cells.
+    let shift = Mods { shift: true, ..Default::default() };
+    s.pointer(PointerEvent { mods: shift, ..tev(PointerKind::Down, 150.0, 165.0) }).unwrap();
+    s.pointer(tev(PointerKind::Up, 150.0, 165.0)).unwrap();
+    let t = text_sel(&s).unwrap();
+    assert_eq!((t.cell, t.is_range()), (Some((1, 0)), false));
+    // Typing goes into the clicked cell.
+    s.execute("text.insert", &json!({"text": "X"})).unwrap();
+    assert_eq!(table_of(&s, id).cell(1, 0).unwrap().text.text(), "cX");
+    // A click outside the table stops editing.
+    s.pointer(tev(PointerKind::Down, 50.0, 400.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 50.0, 400.0)).unwrap();
+    assert!(text_sel(&s).is_none());
+}
+
+#[test]
+fn a_click_in_a_selected_table_enters_the_clicked_cell() {
+    let mut s = session();
+    let id = table_at(&mut s, &[200.0, 200.0], json!([["a", "b"], ["c", "Hello world"]]));
+    s.pointer(tev(PointerKind::Down, 350.0, 160.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 350.0, 160.0)).unwrap();
+    assert_eq!((s.doc().unwrap().selection.shapes.clone(), text_sel(&s)), (vec![id], None), "the first click selects the table");
+    let st = s.doc().unwrap();
+    let p = text_point(st, &TextSel { shape: id, cell: Some((1, 1)), ..Default::default() }, 0, 6);
+    s.pointer(tev(PointerKind::Down, p.x, p.y)).unwrap();
+    s.pointer(tev(PointerKind::Up, p.x, p.y)).unwrap();
+    let t = text_sel(&s).unwrap();
+    assert_eq!((t.cell, t.caret), (Some((1, 1)), (0, 6)), "caret at the click");
+    // Dragging a selected table still moves it.
+    s.execute("text.exit", &json!({})).unwrap();
+    s.pointer(tev(PointerKind::Down, 150.0, 120.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 170.0, 130.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 170.0, 130.0)).unwrap();
+    assert!(text_sel(&s).is_none());
+    assert_ne!(s.doc().unwrap().shape(id).unwrap().xfrm.unwrap().x, 100.0);
+}
+
 #[test]
 fn caret_moves_by_line_in_a_wrapped_cell() {
     let mut s = session();
@@ -466,6 +557,18 @@ fn caret_moves_by_line_in_a_wrapped_cell() {
     assert!(text_sel(&s).unwrap().caret.1 < down.1);
 }
 
+#[test]
+fn rotated_tables_hit_the_cell_under_the_pointer() {
+    let mut s = session();
+    let id = table_at(&mut s, &[100.0, 100.0], json!([["a", "b"], ["c", "d"]]));
+    s.execute("shape.rotate", &json!({"ids": [id], "deg": 90})).unwrap();
+    let st = s.doc().unwrap();
+    let f = cmd::table::table_frame(st, st.shape(id).unwrap()).unwrap();
+    let p = f.affine * deckcraft_geom::Point::new(150.0, 60.0);
+    s.pointer(tev(PointerKind::DoubleClick, p.x, p.y)).unwrap();
+    assert_eq!(text_sel(&s).and_then(|t| t.cell), Some((1, 1)));
+}
+
 #[test]
 fn right_to_left_paragraphs() {
     let mut s = session();
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index c684dc68..ab051c7a 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -361,30 +361,10 @@ impl Session {
             }
             ToolKind::Select => {}
         }
-        let st = self.doc()?;
         // Clicking inside the text being edited moves the caret / starts a text selection.
-        if let Some(t) = st.selection.text.clone()
-            && !t.notes
-            && t.cell.is_none()
-            && let Some(sh) = st.shape(t.shape)
-        {
-            let x = xfrm_of(&st.doc, &st.selection, sh);
-            if x.bounds().inflate(tol, tol).contains(p)
-                && !matches!(self.hit_test(p, tol), Some(Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. }))
-            {
-                let pos = text_pos(st, sh, p);
-                let shift = mods.shift;
-                self.select(|_, sel| {
-                    if let Some(tt) = sel.text.as_mut() {
-                        tt.caret = pos;
-                        if !shift {
-                            tt.anchor = pos;
-                        }
-                    }
-                })?;
-                self.tool.drag = Some(Drag::TextSelect { shape: t.shape });
-                return Ok(json!({"caret": [pos.0, pos.1]}));
-            }
+        if let Some((shape, pos)) = self.place_caret(p, tol, mods.shift)? {
+            self.tool.drag = Some(Drag::TextSelect { shape });
+            return Ok(json!({"caret": [pos.0, pos.1]}));
         }
         let hit = self.hit_test(p, tol);
         let st = self.doc()?;
@@ -432,8 +412,10 @@ impl Session {
                 let origs: Vec<(ShapeId, Xfrm)> =
                     ids.iter().filter_map(|i| st.shape(*i).filter(|s| !s.locked).map(|s| (*i, xfrm_of(&st.doc, &st.selection, s)))).collect();
                 // A click (no drag) on text puts the caret there; unselected text boxes and
-                // placeholders take the caret straight away like PowerPoint.
-                let enter_text = (text && !toggle && (selected || is_text_first(st, id))).then_some((id, p));
+                // placeholders take the caret straight away like PowerPoint. A click in a selected
+                // table puts the caret in the clicked cell.
+                let table = st.shape(id).is_some_and(|s| matches!(s.kind, ShapeKind::Table(_)));
+                let enter_text = (!toggle && ((text && (selected || is_text_first(st, id))) || (table && selected))).then_some((id, p));
                 let ids2 = ids.clone();
                 self.select(|_, sel| {
                     sel.shapes = ids2;
@@ -630,9 +612,10 @@ impl Session {
                 self.tool.preview = Some(x);
             }
             Drag::TextSelect { shape } => {
+                // The selection stays in the shape or table cell where it started.
                 let st = self.doc()?;
-                if let Some(sh) = st.shape(shape) {
-                    let pos = text_pos(st, sh, p);
+                if let Some(t) = st.selection.text.as_ref().filter(|t| t.shape == shape) {
+                    let pos = cmd::text::text_pos_at(st, t, p);
                     self.select(|_, sel| {
                         if let Some(t) = sel.text.as_mut() {
                             t.caret = pos;
@@ -669,11 +652,8 @@ impl Session {
         let mut out = Value::Null;
         match drag {
             Some(Drag::Move { moved: false, enter_text: Some((id, at)), .. }) => {
-                // Plain click on text: caret at the click.
-                let st = self.doc()?;
-                if let Some(sh) = st.shape(id) {
-                    let pos = text_pos(st, sh, at);
-                    self.execute("text.edit", &json!({"id": id, "at": [pos.0, pos.1]}))?;
+                // Plain click on text: caret at the click (in a table, in the clicked cell).
+                if self.edit_text_at(id, at)? {
                     out = json!({"editing": id});
                 }
             }
@@ -792,8 +772,12 @@ impl Session {
             self.tool.sticky = false;
             return Ok(Value::Null);
         }
-        let st = self.doc()?;
-        if st.selection.text.is_some() {
+        // The double-click's second press started a click (caret on release): this replaces it.
+        if matches!(self.tool.drag, Some(Drag::Move { moved: false, .. })) {
+            self.tool.drag = None;
+        }
+        // In the text being edited: select the word double-clicked.
+        if self.place_caret(p, tol, false)?.is_some() {
             return self.execute("text.selectWord", &json!({}));
         }
         match self.hit_test(p, tol) {
@@ -801,18 +785,12 @@ impl Session {
                 let st = self.doc()?;
                 let Some(sh) = st.shape(id).cloned() else { return Ok(Value::Null) };
                 match &sh.kind {
-                    ShapeKind::Table(_) => {
-                        let x = xfrm_of(&st.doc, &st.selection, &sh);
-                        let local = x.affine().inverse() * p;
-                        if let ShapeKind::Table(t) = &sh.kind {
-                            let cell = deckcraft_render_cell(t, &table_rows(st, t), local);
-                            return self.execute("text.edit", &json!({"id": id, "cell": [cell.0, cell.1]}));
+                    ShapeKind::Table(_) | ShapeKind::Shape | ShapeKind::Connector { .. } if !sh.is_line() => {
+                        // Caret at the double-click (in a table, in the clicked cell), then select
+                        // the word there.
+                        if !self.edit_text_at(id, p)? {
+                            return Ok(Value::Null);
                         }
-                        Ok(Value::Null)
-                    }
-                    ShapeKind::Shape | ShapeKind::Connector { .. } if !sh.is_line() => {
-                        let pos = text_pos(st, &sh, p);
-                        self.execute("text.edit", &json!({"id": id, "at": [pos.0, pos.1]}))?;
                         self.execute("text.selectWord", &json!({}))
                     }
                     ShapeKind::Group { .. } => Ok(Value::Null),
@@ -826,6 +804,62 @@ impl Session {
         }
     }
 
+    /// A click at `p` inside the text being edited: the caret goes there (`extend`: the selection
+    /// grows to it). In a table being edited, a click in another cell moves the caret into that
+    /// cell. Returns the edited shape and the caret, or `None` when `p` isn't in the edited text
+    /// (or is on a handle or a table border).
+    fn place_caret(&mut self, p: Point, tol: f64, extend: bool) -> Result<Option<(ShapeId, (usize, usize))>> {
+        let st = self.doc()?;
+        let Some(mut t) = st.selection.text.clone().filter(|t| !t.notes) else { return Ok(None) };
+        let Some(sh) = st.shape(t.shape) else { return Ok(None) };
+        let x = xfrm_of(&st.doc, &st.selection, sh);
+        if !x.bounds().inflate(tol, tol).contains(p)
+            || matches!(self.hit_test(p, tol), Some(Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. }))
+        {
+            return Ok(None);
+        }
+        let old_cell = t.cell;
+        if old_cell.is_some()
+            && let Some(f) = cmd::table::table_frame(st, sh)
+        {
+            t.cell = f.cell_at(f.local(p)).or(old_cell);
+        }
+        let pos = cmd::text::text_pos_at(st, &t, p);
+        // A selection can't span cells: a click in another cell starts afresh.
+        let extend = extend && t.cell == old_cell;
+        let cell = t.cell;
+        self.select(|_, sel| {
+            if let Some(tt) = sel.text.as_mut() {
+                tt.cell = cell;
+                tt.caret = pos;
+                if !extend {
+                    tt.anchor = pos;
+                }
+            }
+        })?;
+        Ok(Some((t.shape, pos)))
+    }
+
+    /// Start editing shape `id`'s text with the caret at slide point `p`; for a table, in the cell
+    /// at `p`. Returns whether editing started.
+    fn edit_text_at(&mut self, id: ShapeId, p: Point) -> Result<bool> {
+        let st = self.doc()?;
+        let Some(sh) = st.shape(id) else { return Ok(false) };
+        let params = match cmd::table::table_frame(st, sh) {
+            Some(f) => {
+                let Some((r, c)) = f.cell_at(f.local(p)) else { return Ok(false) };
+                let pos = cmd::text::text_pos_at(st, &TextSel { shape: id, cell: Some((r, c)), ..Default::default() }, p);
+                json!({"id": id, "cell": [r, c], "at": [pos.0, pos.1]})
+            }
+            None => {
+                let pos = text_pos(st, sh, p);
+                json!({"id": id, "at": [pos.0, pos.1]})
+            }
+        };
+        self.execute("text.edit", &params)?;
+        Ok(true)
+    }
+
     fn is_picture(&self, id: ShapeId) -> bool {
         self.active().and_then(|d| d.shape(id)).is_some_and(|s| matches!(s.kind, ShapeKind::Picture { .. } | ShapeKind::Media(_)))
     }
@@ -1281,29 +1315,6 @@ pub fn table_rows(st: &crate::DocState, t: &deckcraft_model::Table) -> Vec<f64>
     cmd::table_drawn_heights(&st.doc, &st.selection, t)
 }
 
-/// Which table cell contains a table-local point (`heights` from [`table_rows`]).
-fn deckcraft_render_cell(t: &deckcraft_model::Table, heights: &[f64], p: Point) -> (usize, usize) {
-    let mut y = 0.0;
-    let mut row = heights.len().saturating_sub(1);
-    for (i, h) in heights.iter().enumerate() {
-        if p.y < y + h {
-            row = i;
-            break;
-        }
-        y += h;
-    }
-    let mut x = 0.0;
-    let mut col = t.cols.len().saturating_sub(1);
-    for (i, w) in t.cols.iter().enumerate() {
-        if p.x < x + w {
-            col = i;
-            break;
-        }
-        x += w;
-    }
-    (row, col)
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index e853130c..d3181247 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -743,7 +743,7 @@ mod tests {
         }
     }
 
-    /// Double-clicking a table cell edits it with the caret drawn in that cell.
+    /// Double-clicking a table cell edits it with the caret drawn in that cell, where clicked.
     #[test]
     fn double_click_in_a_table_cell_shows_the_caret_there() {
         let (mut harness, id) = app_with_table();
@@ -762,5 +762,14 @@ mod tests {
         for q in [top, bottom] {
             assert!(q.x > 300.0 && q.x < 500.0 && q.y >= 140.0 && q.y <= 180.0, "caret {q:?} outside cell (1, 1)");
         }
+        // A click in another cell moves the caret there.
+        let p = screen(harness.state(), 110.0, 120.0);
+        click(&mut harness, p);
+        harness.run_steps(1);
+        let st = harness.state().session.active().unwrap();
+        let ts = st.selection.text.clone().unwrap();
+        assert_eq!((ts.cell, ts.caret), (Some((0, 0)), (0, 0)));
+        let (top, _) = deckcraft_engine::cmd::text::caret_line(st, &ts).unwrap();
+        assert!(top.x > 100.0 && top.x < 120.0 && top.y >= 100.0 && top.y < 140.0, "caret {top:?} at the start of cell (0, 0)");
     }
 }

From 456c5c53739b44faefcbdcbdea3d2055b1d82b0b Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:19:43 +0200
Subject: [PATCH 081/376] Tables: drag row and column borders to resize them

Hovering a table border shows a resize cursor (new hit kinds
TableColumn and TableRow) and dragging it resizes, one undo step per
drag, as in PowerPoint:

- an inner column border moves between its two columns and the table
  keeps its width;
- the right edge widens or narrows the last column and the table;
- a row's bottom border (the last one is the table's bottom edge) sets
  that row's height, which stays a minimum: rows still grow to fit
  their text.

Columns stop at 12 pt. Borders hidden inside merged cells aren't hit;
the left and top edges still move the table. A border drag while a
cell is edited keeps editing it. The drag goes through
table.columnWidth, which takes a new keepTotal option (the next column
absorbs the change), and table.rowHeight. Hit testing is done in the
table's own frame, so rotated tables resize along their axes.
---
 crates/engine/src/cmd/table.rs |  76 ++++++++++++++++++++++-
 crates/engine/src/tests.rs     | 107 +++++++++++++++++++++++++++++++++
 crates/engine/src/tools.rs     |  76 ++++++++++++++++++++++-
 crates/ui-egui/src/canvas.rs   |  25 ++++++++
 4 files changed, 280 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index 4c46eb5f..fd39faac 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -60,12 +60,23 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("table.distributeColumns", "Distribute Columns", ["Table Layout", "Cell Size"], None, "{id?}", has_selection, |s, p| distribute(
             s, p, false
         )),
-        cmd!("table.columnWidth", "Width", ["Table Layout", "Cell Size"], None, "{col, width: pt, id?}", has_selection, column_width),
+        cmd!(
+            "table.columnWidth",
+            "Width",
+            ["Table Layout", "Cell Size"],
+            None,
+            "{col, width: pt, keepTotal?: bool (the next column absorbs the change), id?}",
+            has_selection,
+            column_width
+        ),
         cmd!("table.rowHeight", "Height", ["Table Layout", "Cell Size"], None, "{row, height: pt, id?}", has_selection, row_height),
         cmd!(noundo "table.selectCells", "Select Cells", [], None, "{from: [r,c], to: [r,c], id?}", has_selection, select_cells),
     ]
 }
 
+/// Narrowest a column gets when its border is dragged (points).
+pub const MIN_COLUMN_WIDTH: f64 = 12.0;
+
 /// A table as drawn on the slide: where it is, its drawn row heights and its visible cells.
 #[derive(Clone, Debug)]
 pub struct TableFrame {
@@ -78,6 +89,15 @@ pub struct TableFrame {
     pub cells: Vec<(usize, usize, Rect)>,
 }
 
+/// A border between table rows or columns that can be dragged.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum TableBorder {
+    /// The right edge of this column (the last one is the table's right edge).
+    Column(usize),
+    /// The bottom edge of this row (the last one is the table's bottom edge).
+    Row(usize),
+}
+
 /// The drawn geometry of table shape `sh` on the edited slide (`None` if it isn't a table).
 pub fn table_frame(st: &DocState, sh: &Shape) -> Option<TableFrame> {
     let ShapeKind::Table(t) = &sh.kind else { return None };
@@ -118,6 +138,38 @@ impl TableFrame {
             .or_else(|| self.cells.iter().rev().find(|(_, _, r)| inside(r)))
             .map(|(r, c, _)| (*r, *c))
     }
+
+    /// The draggable border within `tol` of table-local point `p`: the inner borders and the right
+    /// and bottom edges (the left and top edges move the table). Borders hidden inside merged
+    /// cells don't count.
+    pub fn border_at(&self, p: Point, tol: f64) -> Option<TableBorder> {
+        let (w, h) = (self.width(), self.height());
+        if !(p.x >= -tol && p.y >= -tol && p.x <= w + tol && p.y <= h + tol) {
+            return None;
+        }
+        let q = Point::new(p.x.clamp(0.0, w), p.y.clamp(0.0, h));
+        let mut best: Option<(f64, TableBorder)> = None;
+        let mut x = 0.0;
+        for (i, cw) in self.cols.iter().enumerate() {
+            x += cw.max(0.0);
+            let d = (p.x - x).abs();
+            // A cell ending at this edge at this height shows the border.
+            let shown = self.cells.iter().any(|(_, _, r)| (r.x1 - x).abs() < 1e-6 && q.y >= r.y0 && q.y <= r.y1);
+            if d <= tol && shown && best.is_none_or(|b| d < b.0) {
+                best = Some((d, TableBorder::Column(i)));
+            }
+        }
+        let mut y = 0.0;
+        for (i, rh) in self.heights.iter().enumerate() {
+            y += rh.max(0.0);
+            let d = (p.y - y).abs();
+            let shown = self.cells.iter().any(|(_, _, r)| (r.y1 - y).abs() < 1e-6 && q.x >= r.x0 && q.x <= r.x1);
+            if d <= tol && shown && best.is_none_or(|b| d < b.0) {
+                best = Some((d, TableBorder::Row(i)));
+            }
+        }
+        best.map(|b| b.1)
+    }
 }
 
 fn cell_param(p: &Value, key: &str) -> Option<(usize, usize)> {
@@ -288,9 +340,27 @@ fn distribute(s: &mut Session, p: &Value, rows: bool) -> Result<Value> {
 fn column_width(s: &mut Session, p: &Value) -> Result<Value> {
     let (_, c) = at(s, p);
     let w = f64_param(p, "width").ok_or_else(|| bad("table.columnWidth", "missing `width`"))?.clamp(4.0, 4000.0);
+    let keep_total = bool_or(p, "keepTotal", false);
     with_table(s, p, "table.columnWidth", move |t| {
-        if let Some(x) = t.cols.get_mut(c) {
-            *x = w;
+        // Keeping the table's width, the column to the right gives or takes the difference (dragging
+        // an inner border). The last column has none: the table gets wider or narrower.
+        let pair = t.cols.get(c).zip(t.cols.get(c + 1)).map(|(a, b)| a.max(0.0) + b.max(0.0)).filter(|x| x.is_finite());
+        match pair {
+            Some(pair) if keep_total => {
+                let min = MIN_COLUMN_WIDTH.min(pair / 2.0);
+                let w = w.max(min).min(pair - min);
+                if let Some(x) = t.cols.get_mut(c) {
+                    *x = w;
+                }
+                if let Some(x) = t.cols.get_mut(c + 1) {
+                    *x = pair - w;
+                }
+            }
+            _ => {
+                if let Some(x) = t.cols.get_mut(c) {
+                    *x = w;
+                }
+            }
         }
         Ok(())
     })
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 69d3bc68..772a42d0 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -557,6 +557,113 @@ fn caret_moves_by_line_in_a_wrapped_cell() {
     assert!(text_sel(&s).unwrap().caret.1 < down.1);
 }
 
+#[test]
+fn table_borders_are_hit_where_they_are_drawn() {
+    let mut s = session();
+    let id = table_at(&mut s, &[100.0, 100.0, 100.0], json!([["a", "b", "c"], ["d", "e", "f"]]));
+    let hit = |s: &Session, x: f64, y: f64| s.hit_test(deckcraft_geom::Point::new(x, y), 3.0);
+    assert_eq!(hit(&s, 201.0, 125.0), Some(tools::Hit::TableColumn { id, col: 0 }));
+    assert_eq!(hit(&s, 400.0, 125.0), Some(tools::Hit::TableColumn { id, col: 2 }), "the right edge");
+    assert_eq!(hit(&s, 150.0, 139.0), Some(tools::Hit::TableRow { id, row: 0 }));
+    assert_eq!(hit(&s, 150.0, 181.0), Some(tools::Hit::TableRow { id, row: 1 }), "the bottom edge");
+    assert!(matches!(hit(&s, 100.0, 125.0), Some(tools::Hit::Shape { .. })), "the left edge moves the table");
+    assert!(matches!(hit(&s, 150.0, 125.0), Some(tools::Hit::Shape { .. })));
+    // Hovering a border shows it (the UI picks the resize cursor from the hover).
+    s.pointer(tev(PointerKind::Move, 300.0, 170.0)).unwrap();
+    assert_eq!(s.tool.hover, Some(tools::Hit::TableColumn { id, col: 1 }));
+    // A border inside a merged cell isn't there.
+    s.execute("table.merge", &json!({"id": id, "from": [0, 0], "to": [0, 1]})).unwrap();
+    assert!(matches!(hit(&s, 200.0, 120.0), Some(tools::Hit::Shape { .. })));
+    assert_eq!(hit(&s, 200.0, 160.0), Some(tools::Hit::TableColumn { id, col: 0 }));
+}
+
+#[test]
+fn dragging_column_borders_resizes_columns() {
+    let mut s = session();
+    let id = table_at(&mut s, &[100.0, 100.0, 100.0], json!([["a", "b", "c"], ["d", "e", "f"]]));
+    let undo_depth = s.doc().unwrap().history.undo.len();
+    // An inner border: the two columns share the change, the table keeps its width.
+    s.pointer(tev(PointerKind::Down, 200.0, 125.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 215.0, 125.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 230.0, 128.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 230.0, 128.0)).unwrap();
+    assert_eq!(table_of(&s, id).cols, vec![130.0, 70.0, 100.0]);
+    assert_eq!(s.doc().unwrap().shape(id).unwrap().xfrm.unwrap().w, 300.0);
+    assert_eq!(s.doc().unwrap().history.undo.len(), undo_depth + 1, "one undo step per drag");
+    // Columns don't collapse.
+    s.pointer(tev(PointerKind::Down, 230.0, 125.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 500.0, 125.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 500.0, 125.0)).unwrap();
+    assert_eq!(table_of(&s, id).cols, vec![200.0 - cmd::table::MIN_COLUMN_WIDTH, cmd::table::MIN_COLUMN_WIDTH, 100.0]);
+    s.execute("edit.undo", &json!({})).unwrap();
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(table_of(&s, id).cols, vec![100.0, 100.0, 100.0]);
+    // The right edge: the last column and the table get wider.
+    s.pointer(tev(PointerKind::Down, 400.0, 120.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 450.0, 120.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 450.0, 120.0)).unwrap();
+    assert_eq!(table_of(&s, id).cols, vec![100.0, 100.0, 150.0]);
+    assert_eq!(s.doc().unwrap().shape(id).unwrap().xfrm.unwrap().w, 350.0);
+    // A click on a border without dragging changes nothing.
+    let before = s.doc().unwrap().doc.clone();
+    s.pointer(tev(PointerKind::Down, 200.0, 125.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 200.0, 125.0)).unwrap();
+    assert!(std::sync::Arc::ptr_eq(&before, &s.doc().unwrap().doc));
+}
+
+#[test]
+fn dragging_a_row_border_sets_the_row_height() {
+    let mut s = session();
+    let id = table_at(&mut s, &[200.0, 200.0], json!([["a", "b"], ["c", "d"]]));
+    let drawn = |s: &Session| {
+        let st = s.doc().unwrap();
+        tools::table_rows(st, &table_of(s, id))
+    };
+    s.pointer(tev(PointerKind::Down, 150.0, 140.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 150.0, 170.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 150.0, 170.0)).unwrap();
+    assert_eq!(drawn(&s), vec![70.0, 40.0]);
+    let st = s.doc().unwrap();
+    assert_eq!(cmd::xfrm_of(&st.doc, &st.selection, st.shape(id).unwrap()).h, 110.0, "the table grows");
+    // Rows still fit their text: dragging the border up stops at the text.
+    s.pointer(tev(PointerKind::Down, 150.0, 170.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 150.0, 60.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 150.0, 60.0)).unwrap();
+    let h = drawn(&s)[0];
+    assert!(h > 10.0 && h < 40.0, "row 0 shrinks to its text: {h}");
+    // The bottom edge sizes the last row.
+    let bottom = 100.0 + drawn(&s).iter().sum::<f64>();
+    s.pointer(tev(PointerKind::Down, 150.0, bottom)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 150.0, bottom + 20.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 150.0, bottom + 20.0)).unwrap();
+    assert_eq!(drawn(&s)[1], 60.0);
+}
+
+#[test]
+fn dragging_a_border_while_editing_a_cell_keeps_editing() {
+    let mut s = session();
+    let id = table_at(&mut s, &[100.0, 100.0], json!([["a", "b"]]));
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 1]})).unwrap();
+    s.pointer(tev(PointerKind::Down, 200.0, 120.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 180.0, 120.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 180.0, 120.0)).unwrap();
+    assert_eq!(table_of(&s, id).cols, vec![80.0, 120.0]);
+    assert_eq!(text_sel(&s).and_then(|t| t.cell), Some((0, 1)));
+}
+
+#[test]
+fn column_width_can_keep_the_table_width() {
+    let mut s = session();
+    let id = table_at(&mut s, &[100.0, 100.0, 100.0], json!([["a", "b", "c"]]));
+    s.execute("table.columnWidth", &json!({"id": id, "col": 1, "width": 150.0, "keepTotal": true})).unwrap();
+    assert_eq!(table_of(&s, id).cols, vec![100.0, 150.0, 50.0]);
+    s.execute("table.columnWidth", &json!({"id": id, "col": 1, "width": 1000.0, "keepTotal": true})).unwrap();
+    assert_eq!(table_of(&s, id).cols, vec![100.0, 200.0 - cmd::table::MIN_COLUMN_WIDTH, cmd::table::MIN_COLUMN_WIDTH]);
+    // The last column has no neighbour: the table changes width.
+    s.execute("table.columnWidth", &json!({"id": id, "col": 2, "width": 80.0, "keepTotal": true})).unwrap();
+    assert_eq!(s.doc().unwrap().shape(id).unwrap().xfrm.unwrap().w, 100.0 + (200.0 - cmd::table::MIN_COLUMN_WIDTH) + 80.0);
+}
+
 #[test]
 fn rotated_tables_hit_the_cell_under_the_pointer() {
     let mut s = session();
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index ab051c7a..7e062667 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -85,6 +85,16 @@ pub enum Hit {
         id: ShapeId,
         text: bool,
     },
+    /// The right edge of table column `col` (dragging it resizes the column).
+    TableColumn {
+        id: ShapeId,
+        col: usize,
+    },
+    /// The bottom edge of table row `row` (dragging it resizes the row).
+    TableRow {
+        id: ShapeId,
+        row: usize,
+    },
 }
 
 #[derive(Clone, Debug)]
@@ -129,6 +139,18 @@ enum Drag {
     TextSelect {
         shape: ShapeId,
     },
+    /// Dragging a table border: the right edge of column `index`, or the bottom edge of row
+    /// `index`. `start` is the table-local press point, `size` the column's width or the row's
+    /// drawn height then, `frame` where the table was drawn.
+    TableBorder {
+        id: ShapeId,
+        column: bool,
+        index: usize,
+        start: Point,
+        size: f64,
+        frame: Affine,
+        moved: bool,
+    },
     Ink {
         points: Vec<(f64, f64, f32)>,
     },
@@ -369,6 +391,8 @@ impl Session {
         let hit = self.hit_test(p, tol);
         let st = self.doc()?;
         match hit {
+            Some(Hit::TableColumn { id, col }) => self.begin_table_border(id, true, col, p)?,
+            Some(Hit::TableRow { id, row }) => self.begin_table_border(id, false, row, p)?,
             Some(Hit::Resize { id, handle }) => {
                 let orig = st.shape(id).map(|s| xfrm_of(&st.doc, &st.selection, s)).unwrap_or_default();
                 self.begin("Size");
@@ -623,6 +647,26 @@ impl Session {
                     })?;
                 }
             }
+            Drag::TableBorder { id, column, index, start, size, frame, moved } => {
+                let local = frame.inverse() * p;
+                let d = if column { local.x - start.x } else { local.y - start.y };
+                if !moved && d.abs() < tol.max(1.0) {
+                    return Ok(Value::Null);
+                }
+                if !moved {
+                    self.begin(if column { "Column Width" } else { "Row Height" });
+                }
+                // An inner column border moves between its two columns (the table keeps its
+                // width); the right edge widens the last column and the table. A row's height is
+                // a minimum: rows still grow to fit their text.
+                if column {
+                    let width = (size + d).max(cmd::table::MIN_COLUMN_WIDTH);
+                    self.execute("table.columnWidth", &json!({"id": id, "col": index, "width": width, "keepTotal": true}))?;
+                } else {
+                    self.execute("table.rowHeight", &json!({"id": id, "row": index, "height": (size + d).max(1.0)}))?;
+                }
+                self.tool.drag = Some(Drag::TableBorder { id, column, index, start, size, frame, moved: true });
+            }
             Drag::Freeform { mode, mut points, pressed } => {
                 // Dragging scribbles (except for curves, which only take clicked points).
                 if pressed && mode != "curve" && points.last().is_none_or(|l| (*l - p).hypot() >= 1.5) {
@@ -814,7 +858,10 @@ impl Session {
         let Some(sh) = st.shape(t.shape) else { return Ok(None) };
         let x = xfrm_of(&st.doc, &st.selection, sh);
         if !x.bounds().inflate(tol, tol).contains(p)
-            || matches!(self.hit_test(p, tol), Some(Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. }))
+            || matches!(
+                self.hit_test(p, tol),
+                Some(Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. } | Hit::TableColumn { .. } | Hit::TableRow { .. })
+            )
         {
             return Ok(None);
         }
@@ -860,6 +907,24 @@ impl Session {
         Ok(true)
     }
 
+    /// Press on a table border: dragging it resizes the column or row. Editing a cell of the
+    /// table goes on; otherwise the table becomes the selection.
+    fn begin_table_border(&mut self, id: ShapeId, column: bool, index: usize, p: Point) -> Result<()> {
+        let st = self.doc()?;
+        let Some(f) = st.shape(id).and_then(|sh| cmd::table::table_frame(st, sh)) else { return Ok(()) };
+        let size = if column { f.cols.get(index) } else { f.heights.get(index) }.copied().unwrap_or(0.0);
+        let (start, frame) = (f.local(p), f.affine);
+        if !st.selection.text.as_ref().is_some_and(|t| t.shape == id) {
+            self.select(|_, sel| {
+                sel.shapes = vec![id];
+                sel.text = None;
+                sel.cells = None;
+            })?;
+        }
+        self.tool.drag = Some(Drag::TableBorder { id, column, index, start, size, frame, moved: false });
+        Ok(())
+    }
+
     fn is_picture(&self, id: ShapeId) -> bool {
         self.active().and_then(|d| d.shape(id)).is_some_and(|s| matches!(s.kind, ShapeKind::Picture { .. } | ShapeKind::Media(_)))
     }
@@ -1244,6 +1309,15 @@ fn hit_shape(st: &crate::DocState, sh: &Shape, p: Point, tol: f64) -> Option<Hit
     let x = xfrm_of(&st.doc, &st.selection, sh);
     let inv = x.affine().inverse();
     let local = inv * p;
+    // Table borders resize rows and columns.
+    let near = local.x >= -tol && local.y >= -tol && local.x <= x.w + tol && local.y <= x.h + tol;
+    if near && let Some(f) = cmd::table::table_frame(st, sh) {
+        match f.border_at(f.local(p), tol) {
+            Some(cmd::table::TableBorder::Column(col)) => return Some(Hit::TableColumn { id: sh.id, col }),
+            Some(cmd::table::TableBorder::Row(row)) => return Some(Hit::TableRow { id: sh.id, row }),
+            None => {}
+        }
+    }
     match &sh.kind {
         ShapeKind::Group { children, child } => {
             // A group is hit when any child is hit; the group is what gets selected.
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index d3181247..bdce269b 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -404,6 +404,8 @@ fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
             _ => egui::CursorIcon::ResizeHorizontal,
         },
         (_, Some(Hit::Rotate { .. })) => egui::CursorIcon::Alias,
+        (_, Some(Hit::TableColumn { .. })) => egui::CursorIcon::ResizeColumn,
+        (_, Some(Hit::TableRow { .. })) => egui::CursorIcon::ResizeRow,
         (_, Some(Hit::Adjust { .. } | Hit::LineEnd { .. })) => egui::CursorIcon::PointingHand,
         (_, Some(Hit::Shape { text: true, .. })) => {
             if app.session.active().is_some_and(|d| d.selection.text.is_some()) {
@@ -772,4 +774,27 @@ mod tests {
         let (top, _) = deckcraft_engine::cmd::text::caret_line(st, &ts).unwrap();
         assert!(top.x > 100.0 && top.x < 120.0 && top.y >= 100.0 && top.y < 140.0, "caret {top:?} at the start of cell (0, 0)");
     }
+
+    /// Table borders show a resize cursor and drag to resize columns.
+    #[test]
+    fn table_borders_resize_with_the_pointer() {
+        let (mut harness, id) = app_with_table();
+        let p = screen(harness.state(), 300.0, 120.0);
+        harness.hover_at(p);
+        harness.step();
+        harness.step();
+        assert_eq!(harness.output().platform_output.cursor_icon, egui::CursorIcon::ResizeColumn);
+        let q = screen(harness.state(), 340.0, 120.0);
+        harness.drag_at(p);
+        harness.step();
+        for k in 1..=4 {
+            harness.hover_at(p + (q - p) * k as f32 / 4.0);
+            harness.step();
+        }
+        harness.drop_at(q);
+        harness.run_steps(2);
+        let st = harness.state().session.active().unwrap();
+        let deckcraft_model::ShapeKind::Table(t) = &st.shape(id).unwrap().kind else { panic!("not a table") };
+        assert!((t.cols[0] - 240.0).abs() < 0.5 && (t.cols[1] - 160.0).abs() < 0.5, "{:?}", t.cols);
+    }
 }

From d63d250d584882c9c1900d9e8c8a3a9554f8ac99 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:19:43 +0200
Subject: [PATCH 082/376] Tables: Tab and Shift+Tab skip cells hidden under a
 merge

Tab moved into the cells covered by a merged cell, editing text that is
never drawn. It now goes to the next visible cell; Tab in the last
visible cell still adds a row, and Shift+Tab in the first cell stays.
---
 crates/engine/src/keys.rs  | 23 +++++++++++++++--------
 crates/engine/src/tests.rs | 19 +++++++++++++++++++
 2 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/crates/engine/src/keys.rs b/crates/engine/src/keys.rs
index 665cc22e..2582dd97 100644
--- a/crates/engine/src/keys.rs
+++ b/crates/engine/src/keys.rs
@@ -285,15 +285,22 @@ impl Session {
         let Some(t) = st.selection.text.clone() else { return Ok(Value::Null) };
         let Some((r, c)) = t.cell else { return Ok(Value::Null) };
         let Some(deckcraft_model::ShapeKind::Table(tb)) = st.shape(t.shape).map(|s| s.kind.clone()) else { return Ok(Value::Null) };
-        let (nr, nc) = (tb.n_rows(), tb.n_cols());
+        let (nr, nc) = (tb.n_rows(), tb.n_cols().max(1));
         let idx = r * nc + c;
-        if !back && idx + 1 >= nr * nc {
-            // Tab in the last cell adds a row.
-            self.execute("table.insertRowBelow", &json!({"id": t.shape, "row": r}))?;
-            return self.execute("text.edit", &json!({"id": t.shape, "cell": [r + 1, 0]}));
-        }
-        let ni = if back { idx.saturating_sub(1) } else { idx + 1 };
-        self.execute("text.edit", &json!({"id": t.shape, "cell": [ni / nc.max(1), ni % nc.max(1)]}))?;
+        // Cells hidden under a merged cell are skipped.
+        let visible = |i: &usize| tb.cell(i / nc, i % nc).is_some_and(|x| !x.is_covered());
+        let next = if back { (0..idx).rev().find(visible) } else { (idx + 1..nr * nc).find(visible) };
+        let ni = match next {
+            Some(ni) => ni,
+            None if !back => {
+                // Tab in the last cell adds a row.
+                let last = nr.saturating_sub(1);
+                self.execute("table.insertRowBelow", &json!({"id": t.shape, "row": last}))?;
+                return self.execute("text.edit", &json!({"id": t.shape, "cell": [last + 1, 0]}));
+            }
+            None => idx,
+        };
+        self.execute("text.edit", &json!({"id": t.shape, "cell": [ni / nc, ni % nc]}))?;
         self.execute("text.selectAll", &json!({}))
     }
 }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 772a42d0..e252f2eb 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -676,6 +676,25 @@ fn rotated_tables_hit_the_cell_under_the_pointer() {
     assert_eq!(text_sel(&s).and_then(|t| t.cell), Some((1, 1)));
 }
 
+#[test]
+fn tab_moves_between_cells_skipping_merged_ones() {
+    let mut s = session();
+    let id = table_at(&mut s, &[100.0, 100.0, 100.0], json!([["a", "b", "c"], ["d", "e", "f"]]));
+    s.execute("table.merge", &json!({"id": id, "from": [0, 0], "to": [0, 1]})).unwrap();
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 0]})).unwrap();
+    let cell = |s: &Session| text_sel(s).and_then(|t| t.cell);
+    let shift = Mods { shift: true, ..Default::default() };
+    s.key("Tab", Mods::default()).unwrap();
+    assert_eq!(cell(&s), Some((0, 2)), "the cell under the merge is skipped");
+    s.key("Tab", shift).unwrap();
+    assert_eq!(cell(&s), Some((0, 0)));
+    s.key("Tab", shift).unwrap();
+    assert_eq!(cell(&s), Some((0, 0)), "Shift+Tab in the first cell stays");
+    s.execute("text.edit", &json!({"id": id, "cell": [1, 2]})).unwrap();
+    s.key("Tab", Mods::default()).unwrap();
+    assert_eq!((cell(&s), table_of(&s, id).n_rows()), (Some((2, 0)), 3), "Tab in the last cell adds a row");
+}
+
 #[test]
 fn right_to_left_paragraphs() {
     let mut s = session();

From 8392081976aca3fe485c1d6046da971d4fd19104 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Mon, 12 Oct 2026 15:19:44 +0200
Subject: [PATCH 083/376] Progress docs: table cell editing and border resizing

---
 ROADMAP.md        | 4 +++-
 docs/ui-parity.md | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 2dba0e27..347a3d34 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (progress log: table cell editing and border resizing; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-12 | Tables: the caret and text selection show in the cell being edited; clicks and double-clicks place the caret in the clicked cell (and select the word); dragging inner column borders, the right edge and row borders resizes them in one undo step; Tab skips cells hidden under a merge |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
@@ -147,6 +148,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | Progress log: table cell editing and border resizing |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
 | 2026-10-10 | minor | Readiness-by-audience table with hours to ~95% for full, mainstream and essentials |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..1451e6d2 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (table cells: caret, clicks between cells, border resizing; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -81,6 +81,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Edit points on freeforms | yes | **no** |
 | Crop handles, crop to shape, aspect ratio | yes | partial |
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
+| Table cells: caret and selection in the cell, click into another cell, drag row and column borders | yes | yes; no cell-range selection by dragging across cells |
 | Exact size/position, lock aspect | yes | yes |
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
@@ -148,6 +149,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-12 | minor | Table cells: caret and selection shown in the edited cell, clicks place the caret in the clicked cell, row and column borders drag to resize |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 44a032d3de345351aef912b231bda505c663dae9 Mon Sep 17 00:00:00 2001
From: pierrevbc <101216765+pierrevbc@users.noreply.github.com>
Date: Tue, 13 Oct 2026 10:52:59 +0200
Subject: [PATCH 084/376] Tables: editing tests for tables with a file-defined
 style

A table whose style the file defines (its parts and background drawn
since #292 and #294) edits like the others: the caret is laid out with
the file style's lettering (a regular header where the built-in style
bolds it), a double-click selects the word drawn there, a click moves
the caret to the clicked cell and a border drag resizes the columns
while the cell stays edited.
---
 crates/engine/src/tests.rs | 53 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e252f2eb..600520b7 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -1129,3 +1129,56 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// Tables whose style the file defines (#292, #294: its look and background drawn) edit like the
+/// others: the caret is laid out with the file style's lettering, clicks and double-clicks land
+/// in the cell where it is drawn, and borders still resize.
+#[test]
+fn tables_with_a_file_defined_style_edit_and_resize() {
+    use deckcraft_model::style::{ColorRef, Fill};
+    use deckcraft_model::table::{TablePart, TablePartStyle, TableStyleDef};
+    let mut s = session();
+    let id = table_at(&mut s, &[200.0, 200.0], json!([["Hello world", "b"], ["c", "d"]]));
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 0]})).unwrap();
+    let built_in = caret_point(&s, 0, 8);
+    s.execute("text.exit", &json!({})).unwrap();
+    // The table's style, defined by the file: a plain (not bold) header, a filled body, a
+    // background.
+    {
+        let style = table_of(&s, id).style;
+        let d = s.doc_mut().unwrap();
+        let doc = std::sync::Arc::make_mut(&mut d.doc);
+        let solid = |r, g, b| Some(Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(r, g, b))));
+        doc.table_styles.push(TableStyleDef {
+            id: style,
+            name: "File style".into(),
+            parts: vec![
+                (TablePart::WholeTbl, TablePartStyle { fill: solid(230, 240, 250), ..Default::default() }),
+                (TablePart::FirstRow, TablePartStyle { fill: solid(40, 60, 90), bold: Some(false), ..Default::default() }),
+            ],
+            background: Some(TablePartStyle { fill: solid(200, 200, 200), ..Default::default() }),
+            raw: String::new(),
+        });
+    }
+    s.execute("edit.deselect", &json!({})).unwrap();
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 0]})).unwrap();
+    let p = caret_point(&s, 0, 8);
+    assert!((p.x - built_in.x).abs() > 0.5, "the header is laid out in the file style's (regular) weight: {p:?} vs {built_in:?}");
+    s.execute("text.exit", &json!({})).unwrap();
+    s.execute("edit.deselect", &json!({})).unwrap();
+    // A double-click selects the word drawn there.
+    s.pointer(tev(PointerKind::DoubleClick, p.x, p.y)).unwrap();
+    let t = text_sel(&s).unwrap();
+    assert_eq!((t.cell, t.ordered()), (Some((0, 0)), ((0, 6), (0, 11))));
+    // A click in another cell moves the caret there.
+    s.pointer(tev(PointerKind::Down, 400.0, 160.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 400.0, 160.0)).unwrap();
+    assert_eq!(text_sel(&s).unwrap().cell, Some((1, 1)));
+    // Border drag, while editing: the columns resize, editing goes on.
+    s.pointer(tev(PointerKind::Down, 300.0, 120.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 320.0, 120.0)).unwrap();
+    s.pointer(tev(PointerKind::Drag, 330.0, 121.0)).unwrap();
+    s.pointer(tev(PointerKind::Up, 330.0, 121.0)).unwrap();
+    assert_eq!(table_of(&s, id).cols, vec![230.0, 170.0]);
+    assert_eq!(text_sel(&s).unwrap().cell, Some((1, 1)));
+}

From 503ee5d67e3014ae64496c5a3094e0538acfdcc0 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 12:38:57 +0300
Subject: [PATCH 085/376] A tabbed slide body is an outline, and --help exits
 (#360)

slide.new kept a leading tab as text, while text.set already turned it into a bullet level. The desktop --help flag was opened as a missing file.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 apps/deckcraft/src/main.rs     | 84 +++++++++++++++++++++++++++-------
 crates/engine/src/cmd/slide.rs |  7 ++-
 crates/engine/src/cmd/text.rs  | 10 ++--
 crates/engine/src/tests.rs     | 28 ++++++++++++
 crates/model/src/text.rs       | 15 ++++++
 5 files changed, 120 insertions(+), 24 deletions(-)

diff --git a/apps/deckcraft/src/main.rs b/apps/deckcraft/src/main.rs
index 7b5e48bb..6499e8e1 100644
--- a/apps/deckcraft/src/main.rs
+++ b/apps/deckcraft/src/main.rs
@@ -1,6 +1,7 @@
 //! DeckCraft desktop app.
 //!
 //! Usage: `deckcraft [--control <port>] [--sample] [--show] [files…]`
+//! `deckcraft --help` prints the flags and exits. `deckcraft --version` prints the version and exits.
 //!
 //! `--control <port>` (or `DECKCRAFT_CONTROL_PORT`) starts a localhost JSON-lines control server:
 //! `{"id":1,"method":"ui.inspect","params":{}}` → `{"id":1,"ok":true,"result":…}`.
@@ -129,6 +130,41 @@ fn services() -> Services {
 
 const APP_ID: &str = "ai.storyteller.deckcraft";
 
+const USAGE: &str = "\
+Usage: deckcraft [--control PORT] [--sample] [--show] [FILE...]
+
+  --control PORT  JSON control server on 127.0.0.1:PORT
+  --sample        open the sample presentation
+  --show          start the slide show
+  --help, -h      print this help and exit
+  --version, -V   print the version and exit
+";
+
+enum Startup {
+    Help,
+    Version,
+    Run { control_port: Option<u16>, files: Vec<String>, sample: bool, show: bool },
+}
+
+/// `--help` and `--version` leave before the window and the log file.
+fn startup(mut control_port: Option<u16>, args: impl IntoIterator<Item = String>) -> Startup {
+    let mut files = Vec::new();
+    let mut sample = false;
+    let mut show = false;
+    let mut args = args.into_iter();
+    while let Some(a) = args.next() {
+        match a.as_str() {
+            "--control" => control_port = args.next().and_then(|p| p.parse().ok()),
+            "--sample" => sample = true,
+            "--show" => show = true,
+            "--version" | "-V" => return Startup::Version,
+            "--help" | "-h" => return Startup::Help,
+            _ => files.push(a),
+        }
+    }
+    Startup::Run { control_port, files, sample, show }
+}
+
 fn app_icon() -> Option<egui::IconData> {
     let png: &[u8] = include_bytes!("../../../assets/app-icon/hicolor/256x256/apps/ai.storyteller.deckcraft.png");
     eframe::icon_data::from_png_bytes(png).map_err(|e| log::warn!("app icon: {e}")).ok()
@@ -138,26 +174,21 @@ fn main() -> eframe::Result {
     // First, so every start-up record (and the engine's panic hook, installed with the first
     // Session) is captured; see `logging`.
     let logger = logging::install();
-    let mut control_port: Option<u16> = std::env::var("DECKCRAFT_CONTROL_PORT").ok().and_then(|p| p.parse().ok());
-    let mut files = Vec::new();
-    let mut sample = false;
-    let mut show = false;
-    let mut args = std::env::args().skip(1);
-    while let Some(a) = args.next() {
-        match a.as_str() {
-            "--control" => control_port = args.next().and_then(|p| p.parse().ok()),
-            "--sample" => sample = true,
-            "--show" => show = true,
-            "--version" => {
+    let (control_port, files, sample, show) =
+        match startup(std::env::var("DECKCRAFT_CONTROL_PORT").ok().and_then(|p| p.parse().ok()), std::env::args().skip(1)) {
+            Startup::Help => {
+                print!("{USAGE}");
+                return Ok(());
+            }
+            Startup::Version => {
                 println!("deckcraft {}", env!("CARGO_PKG_VERSION"));
                 return Ok(());
             }
-            _ => files.push(a),
-        }
-    }
+            Startup::Run { control_port, files, sample, show } => (control_port, files, sample, show),
+        };
     log::info!("DeckCraft {} ({} {})", env!("CARGO_PKG_VERSION"), std::env::consts::OS, std::env::consts::ARCH);
-    // The log file lives under the settings directory; opened after the arguments, so `--version`
-    // leaves no file behind. Records logged until now are written to it first.
+    // The log file lives under the settings directory; opened after the arguments, so `--help` and
+    // `--version` leave no file behind. Records logged until now are written to it first.
     if let Some(logger) = logger {
         match config_dir().map(|d| logger.attach_dir(&d.join(logging::LOG_DIR))) {
             Some(Ok(path)) => log::info!("log file {}", path.display()),
@@ -228,3 +259,24 @@ fn main() -> eframe::Result {
         }),
     )
 }
+
+#[cfg(test)]
+mod tests {
+    use super::{Startup, startup};
+
+    #[test]
+    fn help_exits_instead_of_opening_a_file() {
+        assert!(matches!(startup(None, ["--help".to_string()]), Startup::Help));
+        assert!(matches!(startup(None, ["-h".to_string()]), Startup::Help));
+        assert!(matches!(startup(None, ["talk.pptx".to_string(), "--help".to_string()]), Startup::Help));
+        assert!(matches!(startup(None, ["--version".to_string()]), Startup::Version));
+        let launch = startup(Some(9), ["--sample".to_string(), "--control".to_string(), "4242".to_string(), "talk.pptx".to_string()]);
+        assert!(matches!(launch, Startup::Run { .. }));
+        if let Startup::Run { control_port, files, sample, show } = launch {
+            assert_eq!(control_port, Some(4242));
+            assert_eq!(files, ["talk.pptx".to_string()]);
+            assert!(sample);
+            assert!(!show);
+        }
+    }
+}
diff --git a/crates/engine/src/cmd/slide.rs b/crates/engine/src/cmd/slide.rs
index 3d8ad344..41878b34 100644
--- a/crates/engine/src/cmd/slide.rs
+++ b/crates/engine/src/cmd/slide.rs
@@ -108,7 +108,12 @@ fn new(s: &mut Session, p: &Value) -> Result<Value> {
         if let Some(b) = str_param(p, "body")
             && let Some(sh) = slide.shapes.iter_mut().find(|x| x.ph_type().is_some_and(|k| !k.is_title()))
         {
-            sh.text = Some(TextBody::from_text(b));
+            // Same outline rule as text.set: a leading tab is the next bullet level.
+            let mut text = TextBody::from_text(b);
+            for para in &mut text.paragraphs {
+                para.promote_leading_tabs();
+            }
+            sh.text = Some(text);
         }
         let at = usize_param(p, "at").unwrap_or(if doc.slides.is_empty() { 0 } else { sel.slide + 1 }).min(doc.slides.len());
         let id = slide.id;
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..3c0cc7ec 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -705,14 +705,10 @@ fn set(s: &mut Session, p: &Value) -> Result<Value> {
         let levels: Vec<(u8, deckcraft_model::text::ParaProps)> = body.paragraphs.iter().map(|p| (p.level, p.props.clone())).collect();
         let mut nb = TextBody::from_text(&text);
         for (i, para) in nb.paragraphs.iter_mut().enumerate() {
-            // Leading tabs set the outline level.
-            let tabs = para.runs.first().map(|r| r.text.chars().take_while(|c| *c == '\t').count()).unwrap_or(0);
-            if tabs > 0
-                && let Some(r) = para.runs.first_mut()
+            // Leading tabs set the outline level; otherwise keep the paragraph's own level.
+            if !para.promote_leading_tabs()
+                && let Some((lv, pp)) = levels.get(i)
             {
-                r.text = r.text.trim_start_matches('\t').to_string();
-                para.level = tabs.min(8) as u8;
-            } else if let Some((lv, pp)) = levels.get(i) {
                 para.level = *lv;
                 para.props = pp.clone();
             }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..a042deb8 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -226,6 +226,34 @@ fn base64_roundtrip() {
     assert!(cmd::base64_decode("!!").is_none());
 }
 
+#[test]
+fn new_slide_body_tabs_match_text_set() {
+    let body = "Install from DMG\nLaunch app\n\tCheck signing\n\t\tDeep\nBuild a deck";
+    let mut s = session();
+    s.execute("slide.new", &json!({"layout": "titleAndContent", "title": "Test Plan", "body": body})).unwrap();
+    let levels = |s: &Session| {
+        let slide = s.doc().unwrap().current_slide().unwrap();
+        let sh = slide.shapes.iter().find(|x| x.ph_type() == Some(deckcraft_model::PhType::Obj)).unwrap();
+        let rows: Vec<(u8, String)> = sh.text.as_ref().unwrap().paragraphs.iter().map(|p| (p.level, p.text())).collect();
+        (sh.id.0, rows)
+    };
+    let (id, from_new) = levels(&s);
+    assert_eq!(
+        from_new,
+        vec![
+            (0, "Install from DMG".to_string()),
+            (0, "Launch app".to_string()),
+            (1, "Check signing".to_string()),
+            (2, "Deep".to_string()),
+            (0, "Build a deck".to_string()),
+        ]
+    );
+    s.execute("text.set", &json!({"id": id, "text": body})).unwrap();
+    assert_eq!(levels(&s).1, from_new);
+    s.execute("text.set", &json!({"id": id, "text": "\t\t\t\t\t\t\t\t\tCapped"})).unwrap();
+    assert_eq!(levels(&s).1, vec![(8, "Capped".to_string())]);
+}
+
 #[test]
 fn layout_change_keeps_text() {
     let mut s = session();
diff --git a/crates/model/src/text.rs b/crates/model/src/text.rs
index b8138a39..f6bd747d 100644
--- a/crates/model/src/text.rs
+++ b/crates/model/src/text.rs
@@ -453,6 +453,21 @@ impl Paragraph {
     pub fn new(text: &str) -> Self {
         Paragraph { runs: if text.is_empty() { vec![] } else { vec![Run::new(text)] }, ..Default::default() }
     }
+    /// Leading tabs are the outline level (at most 8), the same rule as a typed indent.
+    /// Returns whether any tab was consumed.
+    pub fn promote_leading_tabs(&mut self) -> bool {
+        let Some(r) = self.runs.first_mut() else { return false };
+        if r.kind != RunKind::Text {
+            return false;
+        }
+        let tabs = r.text.chars().take_while(|c| *c == '\t').count();
+        if tabs == 0 {
+            return false;
+        }
+        r.text = r.text.trim_start_matches('\t').to_string();
+        self.level = tabs.min(8) as u8;
+        true
+    }
     pub fn text(&self) -> String {
         self.runs.iter().map(|r| r.content()).collect()
     }

From c238d933df560dcc06d0ef20889c372e89e3724a Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 12:48:28 +0300
Subject: [PATCH 086/376] Mark the current transition effect option (#365)

The Effect Options menu drew every direction as the same button, so the active one was invisible.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/ui-egui/src/ribbon.rs | 30 ++++++++++++++++++++++++++----
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..e5354df7 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1378,12 +1378,14 @@ fn transitions(app: &mut SlideApp, ui: &mut Ui) {
         });
     });
     group(ui, |ui| {
-        let opts: &[&str] = deckcraft_model::anim::TRANSITIONS.iter().find(|x| x.0 == kind).map(|x| x.4).unwrap_or(&[]);
-        let r = big_button(ui, Icon::EffectOptions, "Effect\nOptions", !opts.is_empty());
+        let selected = cur.as_ref().map(|t| t.option.as_str());
+        let rows = transition_effect_rows(&kind, selected);
+        let r = big_button(ui, Icon::EffectOptions, "Effect\nOptions", !rows.is_empty());
         egui::Popup::menu(&r).show(|ui| {
-            for o in opts {
-                if ui.button(deckcraft_model::anim::transition_option_label(&kind, o)).clicked() {
+            for &(o, on) in &rows {
+                if ui.selectable_label(on, deckcraft_model::anim::transition_option_label(&kind, o)).clicked() {
                     run(app, "transition.options", json!({"option": o}));
+                    ui.close();
                 }
             }
         });
@@ -2408,6 +2410,11 @@ fn slide_master(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+/// One row of Transitions ▸ Effect Options: the stored option and whether it is the current one.
+fn transition_effect_rows(kind: &str, current: Option<&str>) -> Vec<(&'static str, bool)> {
+    deckcraft_model::anim::TRANSITIONS.iter().find(|x| x.0 == kind).map(|x| x.4).unwrap_or(&[]).iter().map(|o| (*o, current == Some(*o))).collect()
+}
+
 /// Gallery glyphs for the freeform tools: a wave (curve), a polygon (freeform), a squiggle (scribble).
 fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     let at = |x: f32, y: f32| egui::pos2(r.min.x + x * r.width(), r.min.y + y * r.height());
@@ -2420,3 +2427,18 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+#[cfg(test)]
+mod tests {
+    use super::transition_effect_rows;
+
+    #[test]
+    fn effect_options_mark_the_current_transition_option() {
+        let on = |kind, current| transition_effect_rows(kind, current).into_iter().map(|(_, marked)| marked).collect::<Vec<_>>();
+        assert_eq!(on("push", Some("l")), vec![false, false, true, false]);
+        assert_eq!(on("fade", Some("throughBlack")), vec![false, true]);
+        assert_eq!(on("push", Some("missing")), vec![false, false, false, false]);
+        assert!(on("none", None).is_empty());
+        assert_eq!(transition_effect_rows("cut", Some("")).first().map(|(o, marked)| (*o, *marked)), Some(("", true)));
+    }
+}

From 8b1836bc5320f6c2bebc724c1453c75912bfb253 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 13:10:24 +0300
Subject: [PATCH 087/376] Effect Options marks the stored choice for animations
 too (#365)

The same rule that highlights a transition direction now highlights an animation's direction and text build.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/ui-egui/src/ribbon.rs | 69 +++++++++++++++++++++++++++---------
 1 file changed, 53 insertions(+), 16 deletions(-)

diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index e5354df7..12eab294 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1593,18 +1593,23 @@ fn animations(app: &mut SlideApp, ui: &mut Ui) {
                 });
             }
         });
-        let opts: &[&str] = cur.as_ref().and_then(|c| deckcraft_model::anim::animation_info(&c.effect, c.class)).map(|x| x.5).unwrap_or(&[]);
-        let r = big_button(ui, Icon::EffectOptions, "Effect\nOptions", !opts.is_empty());
+        let effect_rows = cur.as_ref().map(|c| animation_effect_rows(&c.effect, c.class, Some(c.option.as_str()))).unwrap_or_default();
+        let build = cur.as_ref().map(|c| text_build_id(c.text_build));
+        let build_rows = marked_options(&["asOne", "byParagraph"], build);
+        let r = big_button(ui, Icon::EffectOptions, "Effect\nOptions", !effect_rows.is_empty());
         egui::Popup::menu(&r).show(|ui| {
-            for o in opts {
-                if ui.button(option_label(o)).clicked() {
+            for &(o, on) in &effect_rows {
+                if ui.selectable_label(on, option_label(o)).clicked() {
                     run(app, "animation.options", json!({"option": o}));
+                    ui.close();
                 }
             }
             ui.separator();
-            for (l, b) in [("As One Object", "asOne"), ("By Paragraph", "byParagraph")] {
-                if ui.button(l).clicked() {
-                    run(app, "animation.options", json!({"textBuild": b}));
+            for &(id, on) in &build_rows {
+                let label = if id == "byParagraph" { "By Paragraph" } else { "As One Object" };
+                if ui.selectable_label(on, label).clicked() {
+                    run(app, "animation.options", json!({"textBuild": id}));
+                    ui.close();
                 }
             }
         });
@@ -2410,9 +2415,30 @@ fn slide_master(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+/// The stored id is the one marked row. Every other id stays unmarked.
+fn marked_options<'a>(options: &'a [&'a str], current: Option<&str>) -> Vec<(&'a str, bool)> {
+    options.iter().copied().map(|o| (o, current == Some(o))).collect()
+}
+
 /// One row of Transitions ▸ Effect Options: the stored option and whether it is the current one.
 fn transition_effect_rows(kind: &str, current: Option<&str>) -> Vec<(&'static str, bool)> {
-    deckcraft_model::anim::TRANSITIONS.iter().find(|x| x.0 == kind).map(|x| x.4).unwrap_or(&[]).iter().map(|o| (*o, current == Some(*o))).collect()
+    let opts = deckcraft_model::anim::TRANSITIONS.iter().find(|x| x.0 == kind).map(|x| x.4).unwrap_or(&[]);
+    marked_options(opts, current)
+}
+
+/// One row of Animations ▸ Effect Options for the selected effect.
+fn animation_effect_rows(effect: &str, class: AnimClass, current: Option<&str>) -> Vec<(&'static str, bool)> {
+    let opts = deckcraft_model::anim::animation_info(effect, class).map(|x| x.5).unwrap_or(&[]);
+    marked_options(opts, current)
+}
+
+fn text_build_id(build: deckcraft_model::anim::TextBuild) -> &'static str {
+    match build {
+        deckcraft_model::anim::TextBuild::ByParagraph => "byParagraph",
+        deckcraft_model::anim::TextBuild::ByWord => "byWord",
+        deckcraft_model::anim::TextBuild::ByLetter => "byLetter",
+        deckcraft_model::anim::TextBuild::AsOne => "asOne",
+    }
 }
 
 /// Gallery glyphs for the freeform tools: a wave (curve), a polygon (freeform), a squiggle (scribble).
@@ -2430,15 +2456,26 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
 
 #[cfg(test)]
 mod tests {
-    use super::transition_effect_rows;
+    use super::{animation_effect_rows, marked_options, text_build_id, transition_effect_rows};
+    use deckcraft_model::anim::{AnimClass, TextBuild};
+
+    fn marked(rows: Vec<(&str, bool)>) -> Vec<&str> {
+        rows.into_iter().filter(|(_, on)| *on).map(|(id, _)| id).collect()
+    }
 
     #[test]
-    fn effect_options_mark_the_current_transition_option() {
-        let on = |kind, current| transition_effect_rows(kind, current).into_iter().map(|(_, marked)| marked).collect::<Vec<_>>();
-        assert_eq!(on("push", Some("l")), vec![false, false, true, false]);
-        assert_eq!(on("fade", Some("throughBlack")), vec![false, true]);
-        assert_eq!(on("push", Some("missing")), vec![false, false, false, false]);
-        assert!(on("none", None).is_empty());
-        assert_eq!(transition_effect_rows("cut", Some("")).first().map(|(o, marked)| (*o, *marked)), Some(("", true)));
+    fn effect_options_mark_only_the_stored_choice() {
+        assert_eq!(marked(transition_effect_rows("push", Some("l"))), vec!["l"]);
+        assert_eq!(transition_effect_rows("push", Some("l")).into_iter().map(|(_, on)| on).collect::<Vec<_>>(), vec![false, false, true, false]);
+        assert_eq!(marked(transition_effect_rows("fade", Some("throughBlack"))), vec!["throughBlack"]);
+        assert!(marked(transition_effect_rows("push", Some("missing"))).is_empty());
+        assert!(transition_effect_rows("none", None).is_empty());
+        assert_eq!(marked(transition_effect_rows("cut", Some(""))), vec![""]);
+        assert_eq!(marked(animation_effect_rows("fly", AnimClass::Entrance, Some("l"))), vec!["l"]);
+        assert!(marked(animation_effect_rows("fly", AnimClass::Entrance, Some("nope"))).is_empty());
+        assert!(animation_effect_rows("appear", AnimClass::Entrance, Some("l")).is_empty());
+        assert_eq!(marked(marked_options(&["asOne", "byParagraph"], Some(text_build_id(TextBuild::ByParagraph)))), vec!["byParagraph"]);
+        assert_eq!(marked(marked_options(&["asOne", "byParagraph"], Some(text_build_id(TextBuild::AsOne)))), vec!["asOne"]);
+        assert!(marked(marked_options(&["asOne", "byParagraph"], Some(text_build_id(TextBuild::ByWord)))).is_empty());
     }
 }

From 591c06ba33af93408bbf4d9ded033890ac400dc7 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 13:14:07 +0300
Subject: [PATCH 088/376] MCP tools refuse an argument that is not in their
 schema (#371)

A misspelled key used to be dropped, so the tool still succeeded with its defaults.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/mcp/src/tests.rs | 22 ++++++++++++++++++++++
 crates/mcp/src/tools.rs | 33 +++++++++++++++++++++++++++++++--
 docs/mcp.md             |  2 ++
 3 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/crates/mcp/src/tests.rs b/crates/mcp/src/tests.rs
index b1521521..e77d6c3d 100644
--- a/crates/mcp/src/tests.rs
+++ b/crates/mcp/src/tests.rs
@@ -79,6 +79,28 @@ fn agent_builds_a_deck() {
     assert_eq!(n2, n1 + 1);
 }
 
+#[test]
+fn unknown_tool_arguments_are_refused() {
+    let mut s = Server::new(Box::new(Headless::new()));
+    tool(&mut s, "new_presentation", json!({}));
+    let charts = |v: &Value| v["shapes"].as_array().unwrap().iter().filter(|sh| sh["kind"] == "chart").count();
+    let before = charts(&tool(&mut s, "inspect_slide", json!({})));
+    let r = call(&mut s, 2, "tools/call", json!({"name": "insert_chart", "arguments": {"type": "column", "data": [["x", "A"], ["q1", 1]]}}));
+    assert_eq!(r["result"]["isError"], true);
+    let msg = r["result"]["content"][0]["text"].as_str().unwrap();
+    assert!(msg.contains("unknown argument \"data\"") && msg.contains("categories") && msg.contains("series"), "{msg}");
+    assert_eq!(charts(&tool(&mut s, "inspect_slide", json!({}))), before, "a refused call inserts nothing");
+    let r = call(&mut s, 3, "tools/call", json!({"name": "list_commands", "arguments": {"query": "theme", "limit": 1}}));
+    assert_eq!(r["result"]["isError"], true);
+    let msg = r["result"]["content"][0]["text"].as_str().unwrap();
+    assert!(msg.contains("unknown arguments \"limit\", \"query\"") && msg.contains("filter"), "{msg}");
+    // The command's own parameters stay inside `params`.
+    tool(&mut s, "run_command", json!({"command": "slide.new", "params": {"layout": "blank"}}));
+    let tools = call(&mut s, 4, "tools/list", json!({}));
+    let chart = tools["result"]["tools"].as_array().unwrap().iter().find(|t| t["name"] == "insert_chart").unwrap();
+    assert_eq!(chart["inputSchema"]["additionalProperties"], false);
+}
+
 #[test]
 fn errors_are_reported_not_panics() {
     let mut s = Server::new(Box::new(Headless::new()));
diff --git a/crates/mcp/src/tools.rs b/crates/mcp/src/tools.rs
index 1a457dda..29986a79 100644
--- a/crates/mcp/src/tools.rs
+++ b/crates/mcp/src/tools.rs
@@ -47,10 +47,10 @@ fn boolean(desc: &str) -> Value {
     json!({"type": "boolean", "description": desc})
 }
 fn mods_schema() -> Value {
-    json!({"type": "object", "description": "Modifier keys (cmd = Command on macOS / Ctrl elsewhere; alt = Option)", "properties": {"shift": {"type": "boolean"}, "alt": {"type": "boolean"}, "cmd": {"type": "boolean"}}})
+    json!({"type": "object", "additionalProperties": false, "description": "Modifier keys (cmd = Command on macOS / Ctrl elsewhere; alt = Option)", "properties": {"shift": {"type": "boolean"}, "alt": {"type": "boolean"}, "cmd": {"type": "boolean"}}})
 }
 fn obj(props: Value, required: &[&str]) -> Value {
-    let mut o = json!({"type": "object", "properties": props});
+    let mut o = json!({"type": "object", "properties": props, "additionalProperties": false});
     if !required.is_empty() {
         o["required"] = json!(required);
     }
@@ -294,8 +294,37 @@ fn wrap(r: Result<Value, String>) -> ToolResult {
     }
 }
 
+/// Keys other than the tool's schema properties are refused, so a misspelled argument does not
+/// succeed with the tool's defaults. Keys inside a free object such as `run_command`'s `params`
+/// belong to the command and are left for the command to read.
+fn unknown_argument_error(name: &str, args: &Value) -> Option<String> {
+    let defs = tool_definitions();
+    let def = defs.iter().find(|t| t.get("name").and_then(Value::as_str) == Some(name))?;
+    let mut allowed: Vec<&str> = def
+        .get("inputSchema")
+        .and_then(|s| s.get("properties"))
+        .and_then(Value::as_object)
+        .map(|p| p.keys().map(String::as_str).collect())
+        .unwrap_or_default();
+    allowed.sort_unstable();
+    let obj = args.as_object()?;
+    let mut unknown: Vec<&str> = obj.keys().map(String::as_str).filter(|k| !allowed.contains(k)).collect();
+    unknown.sort_unstable();
+    let first = unknown.first()?;
+    let expected = if allowed.is_empty() { "none".to_string() } else { allowed.join(", ") };
+    let (what, list) = if unknown.len() == 1 {
+        ("unknown argument", format!("{first:?}"))
+    } else {
+        ("unknown arguments", unknown.iter().map(|k| format!("{k:?}")).collect::<Vec<_>>().join(", "))
+    };
+    Some(format!("{name}: {what} {list} (expected: {expected})"))
+}
+
 pub fn call_tool(b: &mut dyn Backend, name: &str, a: &Value) -> ToolResult {
     let a = if a.is_object() { a.clone() } else { json!({}) };
+    if let Some(msg) = unknown_argument_error(name, &a) {
+        return ToolResult::error(msg);
+    }
     match name {
         "list_commands" => wrap(b.call("engine.commands", json!({})).map(|v| {
             let f = a.get("filter").and_then(Value::as_str).unwrap_or("").to_lowercase();
diff --git a/docs/mcp.md b/docs/mcp.md
index f7e24c7e..07284e70 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -30,6 +30,8 @@ deck.
 | `screenshot` | The whole window, UI included (connected mode) |
 | `call_app` | Any [control protocol](control-protocol.md) method (connected mode) |
 
+A tool refuses an argument that is not in its schema (`insert_chart: unknown argument "data" (expected: categories, series, title, type)`). Keys inside `run_command`'s `params` are that command's parameters.
+
 Useful commands for building decks: `slide.new {layout, title, body}`, `shape.insert {preset,
 rect, text}`, `shape.connect {from, to, preset}`, `shape.freeform {points, closed, smooth}`,
 `shape.merge {op, ids}`, `format.*`, `design.theme`, `transition.set`, `animation.set`,

From ad8fea51d2d48ff55561085c5b19d650052f5d77 Mon Sep 17 00:00:00 2001
From: Momentum96 <wjsrjsdn12@gmail.com>
Date: Tue, 13 Oct 2026 19:27:56 +0900
Subject: [PATCH 089/376] ui: admit stock macOS CJK faces as interface
 fallbacks (#101)

The 48 MB cap on borrowed UI faces rejected macOS's only Hangul face (AppleSDGothicNeo.ttc, ~55 MB) and the picked Simplified Chinese face (PingFang.ttc, ~78 MB), so Korean and Chinese text in the title, recent files and notes drew as boxes. Raise the cap to 128 MB, as in PhotoCraft.
---
 contributors/people.toml      | 3 +++
 crates/ui-egui/src/uifonts.rs | 6 ++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/contributors/people.toml b/contributors/people.toml
index c10fb209..2905c49c 100644
--- a/contributors/people.toml
+++ b/contributors/people.toml
@@ -41,3 +41,6 @@ sync_github_name = true
 [people.Silvertree2010]
 display_name = "Netter"
 sync_github_name = false
+
+[people.Momentum96]
+sync_github_name = true
diff --git a/crates/ui-egui/src/uifonts.rs b/crates/ui-egui/src/uifonts.rs
index 50ebc87b..4672cbe0 100644
--- a/crates/ui-egui/src/uifonts.rs
+++ b/crates/ui-egui/src/uifonts.rs
@@ -14,8 +14,10 @@ use std::sync::Arc;
 
 use deckcraft_fonts::{FontDb, FontFace};
 
-/// Faces larger than this are left out (egui keeps a copy of each face it is given).
-const MAX_FACE_BYTES: usize = 48 << 20;
+/// Faces larger than this are left out (egui keeps a copy of each face it is given). Large enough
+/// for the stock macOS CJK collections the font database picks: `AppleSDGothicNeo.ttc` (about
+/// 55 MB, the only Hangul face) and `PingFang.ttc` (about 78 MB, Simplified Chinese).
+const MAX_FACE_BYTES: usize = 128 << 20;
 
 /// Faces borrowed for the interface, and the characters already looked at.
 #[derive(Default)]

From 69d4893689191ebd62fe4e184c3c31dd8753cce0 Mon Sep 17 00:00:00 2001
From: Sazid Al Bayazid <race-relish-stick@duck.com>
Date: Tue, 13 Oct 2026 01:19:31 +0600
Subject: [PATCH 090/376] Comments: threads and resolved state survive a .pptx
 round trip (#70)

The writer emitted the legacy comment part only: replies were flattened
into sibling comments, the resolved flag was dropped. Modern PowerPoint
decks carry a second, threaded part (p188) as well - and DeckCraft read
both, importing every comment twice.

Export now writes the modern threaded part (p188:cmLst, with the slide's
commentRel anchor ext and the modern authors part) next to the flattened
legacy part, the same pair of parts PowerPoint itself writes: older
readers keep the legacy view, PowerPoint 2021+ and DeckCraft read
threads, replies and resolved state. The reader prefers the modern part
when both are present and scales modern positions as EMU instead of
legacy 1/8 pt, so real PowerPoint decks stop double-importing their
comments and keep their marker positions.

Comment ids are deterministic GUIDs from the existing tables::guid, so
exports stay reproducible without a new dependency.

Known limitation for a follow-up: comments anchor with
p188:unknownAnchor (schema-valid) rather than a slide moniker, which
needs part identity the model does not have yet.

Tests: threads plus resolved state round-trip on top-level comments and
replies, both parts and the anchor-rel wiring asserted in the raw
package, part numbering with comment-free slides skipped, legacy-only
and modern-only packages import each with their own position units, and
XML-special characters survive the trip.
---
 ROADMAP.md                    |   1 +
 crates/pptx/src/lib.rs        |   3 +
 crates/pptx/src/opc.rs        |   2 +
 crates/pptx/src/read/mod.rs   |  30 +++--
 crates/pptx/src/write/mod.rs  | 167 ++++++++++++++++++++++++---
 crates/pptx/tests/comments.rs | 208 ++++++++++++++++++++++++++++++++++
 docs/file-format-parity.md    |   5 +-
 docs/gaps.md                  |  16 +--
 docs/roadmap.md               |   2 +-
 9 files changed, 398 insertions(+), 36 deletions(-)
 create mode 100644 crates/pptx/tests/comments.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..63fd7a60 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -131,6 +131,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
+| 2026-10-13 | PPTX export writes modern threaded comments (`p188`) next to the flattened legacy part; replies and resolved state survive a round trip, and real PowerPoint decks stop importing their comments twice (#70) |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
diff --git a/crates/pptx/src/lib.rs b/crates/pptx/src/lib.rs
index 92274b62..8a619edf 100644
--- a/crates/pptx/src/lib.rs
+++ b/crates/pptx/src/lib.rs
@@ -21,6 +21,9 @@ use deckcraft_model::Presentation;
 /// Extension URI of the PowerPoint 2010 section list in `presentation.xml`.
 pub(crate) const SECTION_EXT_URI: &str = "{521415D9-36F7-43E2-AB2F-B90AF26B5E84}";
 
+/// Extension URI of the modern-comments anchor in a slide (names the threaded comment part).
+pub(crate) const COMMENTS_EXT_URI: &str = "{6950BFC3-D8DA-4A85-94F7-54DA5524770B}";
+
 #[derive(Debug, thiserror::Error)]
 pub enum PptxError {
     #[error("not a PPTX file: {0}")]
diff --git a/crates/pptx/src/opc.rs b/crates/pptx/src/opc.rs
index 4ef21c3d..e03e8757 100644
--- a/crates/pptx/src/opc.rs
+++ b/crates/pptx/src/opc.rs
@@ -24,6 +24,8 @@ pub const NS_P14: &str = "http://schemas.microsoft.com/office/powerpoint/2010/ma
 pub const NS_P15: &str = "http://schemas.microsoft.com/office/powerpoint/2012/main";
 pub const NS_P159: &str = "http://schemas.microsoft.com/office/powerpoint/2015/09/main";
 pub const NS_A14: &str = "http://schemas.microsoft.com/office/drawing/2010/main";
+/// Modern (threaded) comments, Office 2018/8 schema.
+pub const NS_P188: &str = "http://schemas.microsoft.com/office/powerpoint/2018/8/main";
 
 pub const RT_BASE: &str = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/";
 pub const RT_MEDIA: &str = "http://schemas.microsoft.com/office/2007/relationships/media";
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..c4959de2 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -312,12 +312,24 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
             let np = Part::new(&pkg, &n.target, &nd);
             slide.notes = read_notes(&mut imp, &np, &nd.root);
         }
-        // Comments.
+        // Comments. A modern part and the legacy part can describe the same threads (PowerPoint
+        // writes both): the modern one wins, its flattened legacy copy is skipped.
+        let mut parts: Vec<(Doc, bool)> = vec![];
         for c in part.rels.all_of("comments") {
             if let Some(cd) = pkg.xml(&c.target) {
-                slide.comments.extend(read_comments(&pkg, &pres_part, &cd.root));
+                // The content type names the modern part; a package that types it only through a
+                // Default entry instead of an Override is still modern when its root is p188.
+                let modern = pkg.content_type(&c.target).as_deref() == Some(crate::write::CT_COMMENTS_MODERN) || cd.root.prefix() == "p188";
+                parts.push((cd, modern));
             }
         }
+        let has_modern = parts.iter().any(|(_, m)| *m);
+        for (cd, modern) in parts {
+            if has_modern && !modern {
+                continue;
+            }
+            slide.comments.extend(read_comments(&pkg, &pres_part, &cd.root, modern));
+        }
         file_slide_ids.insert(*file_id, *id);
         p.slides.push(Arc::new(slide));
     }
@@ -746,7 +758,7 @@ fn read_notes(imp: &mut Imp, part: &Part, root: &El) -> TextBody {
     TextBody::default()
 }
 
-fn read_comments(pkg: &Package, pres: &Part, root: &El) -> Vec<Comment> {
+fn read_comments(pkg: &Package, pres: &Part, root: &El, modern: bool) -> Vec<Comment> {
     // Authors: legacy commentAuthors.xml (numeric ids) and modern authors.xml (GUIDs).
     let mut authors: HashMap<String, (String, String)> = HashMap::new();
     for kind in ["commentAuthors", "authors"] {
@@ -760,7 +772,9 @@ fn read_comments(pkg: &Package, pres: &Part, root: &El) -> Vec<Comment> {
             }
         }
     }
-    fn one(e: &El, authors: &HashMap<String, (String, String)>, depth: usize) -> Comment {
+    // Legacy positions are 1/8 pt; the modern part's p188:pos is an a:CT_Point2D in EMU.
+    let scale = if modern { 12_700.0 } else { 8.0 };
+    fn one(e: &El, authors: &HashMap<String, (String, String)>, depth: usize, scale: f64) -> Comment {
         let (author, initials) = e.attr("authorId").and_then(|a| authors.get(a).cloned()).unwrap_or_default();
         let text = if let Some(t) = e.child("text") {
             t.text()
@@ -771,7 +785,7 @@ fn read_comments(pkg: &Package, pres: &Part, root: &El) -> Vec<Comment> {
         };
         let pos = e.child("pos");
         let replies = if depth < 4 {
-            e.child("replyLst").map(|l| l.children_named("reply").take(1000).map(|r| one(r, authors, depth + 1)).collect()).unwrap_or_default()
+            e.child("replyLst").map(|l| l.children_named("reply").take(1000).map(|r| one(r, authors, depth + 1, scale)).collect()).unwrap_or_default()
         } else {
             vec![]
         };
@@ -780,14 +794,14 @@ fn read_comments(pkg: &Package, pres: &Part, root: &El) -> Vec<Comment> {
             initials,
             text,
             date: e.attr("dt").or(e.attr("created")).unwrap_or("").to_string(),
-            x: pos.and_then(|p| p.f64("x")).unwrap_or(0.0) / 8.0,
-            y: pos.and_then(|p| p.f64("y")).unwrap_or(0.0) / 8.0,
+            x: pos.and_then(|p| p.f64("x")).unwrap_or(0.0) / scale,
+            y: pos.and_then(|p| p.f64("y")).unwrap_or(0.0) / scale,
             resolved: e.attr("status") == Some("resolved"),
             replies,
             shape: None,
         }
     }
-    root.children_named("cm").take(10_000).map(|c| one(c, &authors, 0)).collect()
+    root.children_named("cm").take(10_000).map(|c| one(c, &authors, 0, scale)).collect()
 }
 
 fn read_show(sp: &El, shows: &HashMap<String, String>) -> ShowSettings {
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..7b8acac5 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -16,7 +16,7 @@ use deckcraft_model::{
 };
 
 use crate::PptxError;
-use crate::opc::{self, NS_A, NS_P, NS_P14, NS_R, PackageOut, RelsOut};
+use crate::opc::{self, NS_A, NS_P, NS_P14, NS_P188, NS_R, PackageOut, RelsOut};
 use crate::xml::{A, W};
 
 const CT_PRES: &str = "application/vnd.openxmlformats-officedocument.presentationml.presentation.main+xml";
@@ -32,6 +32,12 @@ const CT_TABLE_STYLES: &str = "application/vnd.openxmlformats-officedocument.pre
 const CT_CHART: &str = "application/vnd.openxmlformats-officedocument.drawingml.chart+xml";
 const CT_COMMENTS: &str = "application/vnd.openxmlformats-officedocument.presentationml.comments+xml";
 const CT_AUTHORS: &str = "application/vnd.openxmlformats-officedocument.presentationml.commentAuthors+xml";
+/// Modern threaded comments (read by PowerPoint 2021+ and DeckCraft; the flattened legacy
+/// part next to it serves older readers).
+pub(crate) const CT_COMMENTS_MODERN: &str = "application/vnd.ms-powerpoint.comments+xml";
+const CT_AUTHORS_MODERN: &str = "application/vnd.ms-powerpoint.authors+xml";
+const RT_COMMENTS_MODERN: &str = "http://schemas.microsoft.com/office/2018/10/relationships/comments";
+const RT_AUTHORS_MODERN: &str = "http://schemas.microsoft.com/office/2018/10/relationships/authors";
 const CT_CORE: &str = "application/vnd.openxmlformats-package.core-properties+xml";
 const CT_APP: &str = "application/vnd.openxmlformats-officedocument.extended-properties+xml";
 
@@ -281,6 +287,31 @@ fn ext_children(raw: Option<&str>) -> Option<String> {
     Some(raw.to_string())
 }
 
+/// The slide's extension list, plus the modern-comments anchor when the slide has a threaded
+/// comment part: the rel reference is how PowerPoint finds it.
+fn slide_ext_list(w: &mut W, raw: Option<&str>, comment_rel: Option<&str>) {
+    let mut exts: Vec<String> = raw
+        .filter(|r| !r.trim().is_empty())
+        .and_then(|raw| crate::xml::parse(format!("<x>{raw}</x>").as_bytes()).ok())
+        .map(|d| d.root.elements().filter(|e| e.is("ext") && e.has_attr("uri")).map(|e| e.to_xml()).collect())
+        .unwrap_or_default();
+    if let Some(rid) = comment_rel {
+        let mut e = W::frag();
+        e.open("p:ext", A::new().a("uri", crate::COMMENTS_EXT_URI));
+        e.empty("p188:commentRel", A::new().a("xmlns:p188", NS_P188).a("r:id", rid));
+        e.close("p:ext");
+        exts.push(e.s);
+    }
+    if exts.is_empty() {
+        return;
+    }
+    w.open0("p:extLst");
+    for e in exts {
+        w.raw(&e);
+    }
+    w.close("p:extLst");
+}
+
 fn notes_master_shapes(size: deckcraft_geom::Size) -> Vec<Shape> {
     let (w, h) = (size.width, size.height);
     let mk = |id: u32, name: &str, kind: PhType, idx: u32, x: f64, y: f64, ww: f64, hh: f64| Shape {
@@ -331,12 +362,24 @@ fn notes_style() -> deckcraft_model::text::ListStyle {
     ls
 }
 
+/// A plausible xsd:dateTime (`YYYY-MM-DD[THH:MM:SS(.frac)?(Z|±HH:MM)?]`): the ranges are
+/// checked, so a model value like `2025-13-45T99:99` falls back to the default instead of
+/// reaching a required `dt`/`created` attribute.
 fn valid_date(s: &str) -> bool {
     let b = s.as_bytes();
-    b.len() >= 10
-        && b.iter().take(4).all(|c| c.is_ascii_digit())
-        && b.get(4) == Some(&b'-')
-        && s.chars().all(|c| c.is_ascii_alphanumeric() || "-:.+TZ".contains(c))
+    let n = |r: std::ops::Range<usize>| s.get(r).and_then(|v| v.parse::<u32>().ok());
+    let (Some(_), Some(mo), Some(d)) = (n(0..4), n(5..7), n(8..10)) else { return false };
+    if b.get(4) != Some(&b'-') || b.get(7) != Some(&b'-') || !(1..=12).contains(&mo) || !(1..=31).contains(&d) {
+        return false;
+    }
+    match b.get(10) {
+        None => true,
+        Some(b'T') => match (n(11..13), n(14..16), n(17..19)) {
+            (Some(h), Some(mi), Some(sec)) => h <= 23 && mi <= 59 && sec <= 60 && b.get(13) == Some(&b':') && b.get(16) == Some(&b':'),
+            _ => false,
+        },
+        Some(_) => false,
+    }
 }
 
 /// A copy of the presentation with every slide pointing at a layout that exists.
@@ -481,13 +524,21 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
             x.pkg.xml_part(&nname, CT_NOTES, xml);
             x.pkg.rels(&nname, &no.rels);
         }
+        let mut comment_rel = None;
         if !s.comments.is_empty() {
             n_comments += 1;
             let cname = format!("ppt/comments/comment{n_comments}.xml");
             so.rels.add("comments", &opc::relative(&sname, &cname), false);
             x.pkg.xml_part(&cname, CT_COMMENTS, comments_xml(&s.comments, &mut authors));
+            // The modern threaded part next to the flattened legacy one (issue #70):
+            // PowerPoint 2021+ and DeckCraft read replies and resolved state from it,
+            // older readers keep the legacy part.
+            let mname = format!("ppt/comments/modernComment{n_comments}.xml");
+            let rid = so.rels.add(RT_COMMENTS_MODERN, &opc::relative(&sname, &mname), false);
+            x.pkg.xml_part(&mname, CT_COMMENTS_MODERN, modern_comments_xml(&s.comments, &cname, &mut authors));
+            comment_rel = Some(rid);
         }
-        let xml = slide_xml(&mut x, &mut so, s);
+        let xml = slide_xml(&mut x, &mut so, s, comment_rel.as_deref());
         x.pkg.xml_part(&sname, CT_SLIDE, xml);
         x.pkg.rels(&sname, &so.rels);
         slide_rids.push(pres.rels.add("slide", &opc::relative("ppt/presentation.xml", &sname), false));
@@ -502,6 +553,15 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         w.close("p:cmAuthorLst");
         x.pkg.xml_part(name, CT_AUTHORS, w.finish());
         pres.rels.add("commentAuthors", "commentAuthors.xml", false);
+        // The modern authors part the threaded comments' authorId GUIDs point at.
+        let mut w = W::new();
+        w.open("p188:authorLst", A::new().a("xmlns:p188", NS_P188));
+        for (n, ini, _) in authors.iter() {
+            w.empty("p188:author", A::new().a("id", author_guid(n)).a("name", n).a("initials", ini).a("userId", "").a("providerId", "None"));
+        }
+        w.close("p188:authorLst");
+        x.pkg.xml_part("ppt/authors.xml", CT_AUTHORS_MODERN, w.finish());
+        pres.rels.add(RT_AUTHORS_MODERN, "authors.xml", false);
     }
 
     // Presentation-level parts.
@@ -565,7 +625,7 @@ fn master_xml(x: &mut Exp, o: &mut Out, m: &Master, layouts: &[(u64, String)]) -
     w.finish()
 }
 
-fn slide_xml(x: &mut Exp, o: &mut Out, s: &Slide) -> Vec<u8> {
+fn slide_xml(x: &mut Exp, o: &mut Out, s: &Slide, comment_rel: Option<&str>) -> Vec<u8> {
     let mut w = W::new();
     root_open(&mut w, "p:sld", A::new().o("showMasterSp", (!s.show_master_shapes).then_some("0")).o("show", s.hidden.then_some("0")));
     let ids = csld(&mut w, x, o, &s.name, s.background.as_ref(), &s.shapes);
@@ -576,7 +636,7 @@ fn slide_xml(x: &mut Exp, o: &mut Out, s: &Slide) -> Vec<u8> {
     if !s.animations.is_empty() {
         timing::timing(&mut w, x, &s.animations, &s.shapes, &ids);
     }
-    ext_list(&mut w, s.raw_ext.as_deref());
+    slide_ext_list(&mut w, s.raw_ext.as_deref(), comment_rel);
     w.close("p:sld");
     w.finish()
 }
@@ -618,15 +678,7 @@ fn comments_xml(list: &[Comment], authors: &mut Vec<(String, String, u32)>) -> V
         }
     }
     for c in flat {
-        let author = if c.author.is_empty() { "Author".to_string() } else { c.author.clone() };
-        let ai = match authors.iter().position(|(n, _, _)| *n == author) {
-            Some(i) => i,
-            None => {
-                let ini = if c.initials.is_empty() { author.chars().filter(|c| c.is_alphabetic()).take(2).collect() } else { c.initials.clone() };
-                authors.push((author.clone(), ini, 0));
-                authors.len() - 1
-            }
-        };
+        let ai = author_slot(c, authors);
         let idx = match authors.get_mut(ai) {
             Some(a) => {
                 a.2 += 1;
@@ -645,6 +697,87 @@ fn comments_xml(list: &[Comment], authors: &mut Vec<(String, String, u32)>) -> V
     w.finish()
 }
 
+/// The author's slot in the shared bucket list, adding them on first use. Legacy parts index the
+/// list by number, the modern authors part gives every slot a GUID.
+fn author_slot(c: &Comment, authors: &mut Vec<(String, String, u32)>) -> usize {
+    let author = if c.author.is_empty() { "Author".to_string() } else { c.author.clone() };
+    match authors.iter().position(|(n, _, _)| *n == author) {
+        Some(i) => i,
+        None => {
+            let ini = if c.initials.is_empty() { author.chars().filter(|ch| ch.is_alphabetic()).take(2).collect() } else { c.initials.clone() };
+            authors.push((author.clone(), ini, 0));
+            authors.len() - 1
+        }
+    }
+}
+
+/// The modern (p188) threaded-comment part: replies nest and the resolved state is kept, which
+/// the flattened legacy part cannot express (issue #70).
+fn modern_comments_xml(list: &[Comment], part: &str, authors: &mut Vec<(String, String, u32)>) -> Vec<u8> {
+    let mut w = W::new();
+    w.open("p188:cmLst", A::new().a("xmlns:p188", NS_P188));
+    for (ti, c) in list.iter().take(10_000).enumerate() {
+        modern_comment(&mut w, c, part, ti, authors, 0);
+    }
+    w.close("p188:cmLst");
+    w.finish()
+}
+
+fn modern_comment(w: &mut W, c: &Comment, part: &str, ti: usize, authors: &mut Vec<(String, String, u32)>, depth: usize) {
+    let ai = author_slot(c, authors);
+    let author = authors.get(ai).map(|(n, _, _)| n.clone()).unwrap_or_default();
+    let dt = if valid_date(&c.date) { c.date.clone() } else { "2024-01-01T00:00:00.000".into() };
+    let mut a = A::new().a("id", crate::tables::guid(&format!("deckcraft-comment:{part}:{ti}"))).a("authorId", author_guid(&author)).a("created", dt);
+    if c.resolved {
+        a = a.a("status", "resolved");
+    }
+    w.open("p188:cm", a);
+    w.empty0("p188:unknownAnchor");
+    let emu = |v: f64| if v.is_finite() { (v * 12_700.0).round().clamp(0.0, 1.0e9) as i64 } else { 0 };
+    w.empty("p188:pos", A::new().a("x", emu(c.x)).a("y", emu(c.y)));
+    if depth < 4 && !c.replies.is_empty() {
+        w.open0("p188:replyLst");
+        for (ri, r) in c.replies.iter().take(1000).enumerate() {
+            let ri_ai = author_slot(r, authors);
+            let r_author = authors.get(ri_ai).map(|(n, _, _)| n.clone()).unwrap_or_default();
+            let rdt = if valid_date(&r.date) { r.date.clone() } else { "2024-01-01T00:00:00.000".into() };
+            let mut ra = A::new()
+                .a("id", crate::tables::guid(&format!("deckcraft-comment:{part}:{ti}:{ri}")))
+                .a("authorId", author_guid(&r_author))
+                .a("created", rdt);
+            if r.resolved {
+                ra = ra.a("status", "resolved");
+            }
+            w.open("p188:reply", ra);
+            tx_body(w, &r.text);
+            w.close("p188:reply");
+        }
+        w.close("p188:replyLst");
+    }
+    tx_body(w, &c.text);
+    w.close("p188:cm");
+}
+
+/// An `a:txBody` with one paragraph per line, the shape the reader re-joins with `\n`.
+fn tx_body(w: &mut W, text: &str) {
+    w.open0("p188:txBody");
+    w.empty0("a:bodyPr");
+    for line in text.split('\n') {
+        w.open0("a:p");
+        w.open0("a:r");
+        w.empty("a:rPr", A::new().a("lang", "en-US"));
+        w.elt("a:t", line);
+        w.close("a:r");
+        w.close("a:p");
+    }
+    w.close("p188:txBody");
+}
+
+/// The modern author id for a name: the same GUID the authors part writes.
+fn author_guid(name: &str) -> String {
+    crate::tables::guid(&format!("deckcraft-comment-author:{name}"))
+}
+
 /// Sections with every slide in exactly one section, in slide order.
 fn section_slides(p: &Presentation) -> Vec<(String, Vec<usize>)> {
     let mut out: Vec<(String, Vec<usize>)> = p.sections.iter().map(|s| (s.name.clone(), vec![])).collect();
diff --git a/crates/pptx/tests/comments.rs b/crates/pptx/tests/comments.rs
new file mode 100644
index 00000000..2aace626
--- /dev/null
+++ b/crates/pptx/tests/comments.rs
@@ -0,0 +1,208 @@
+//! Comment threads through PPTX: the modern part keeps replies and resolved state, the legacy
+//! part stays readable, and a package with both imports every thread once.
+
+use std::io::Read;
+use std::sync::Arc;
+
+use deckcraft_model::{Comment, Presentation, defaults};
+
+fn deck() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let s = Arc::make_mut(&mut p.slides[0]);
+    s.comments = vec![
+        Comment {
+            author: "Ada".into(),
+            initials: "AL".into(),
+            text: "Top thread\nsecond line".into(),
+            date: "2025-03-04T05:06:07Z".into(),
+            x: 90.0,
+            y: 45.0,
+            resolved: true,
+            replies: vec![
+                Comment { author: "Bob".into(), text: "A <reply> & more".into(), date: "2025-03-04T06:00:00Z".into(), ..Default::default() },
+                Comment {
+                    author: "Ada".into(),
+                    text: "Another reply".into(),
+                    date: "2025-03-04T06:30:00Z".into(),
+                    resolved: true,
+                    ..Default::default()
+                },
+            ],
+            shape: None,
+        },
+        Comment {
+            author: "Bob".into(),
+            initials: "BC".into(),
+            text: "Open thread".into(),
+            date: "2025-03-05T01:02:03Z".into(),
+            x: 120.0,
+            y: 60.0,
+            resolved: false,
+            replies: vec![],
+            shape: None,
+        },
+    ];
+    p
+}
+
+fn part(bytes: &[u8], name: &str) -> String {
+    let mut z = zip::ZipArchive::new(std::io::Cursor::new(bytes)).expect("zip");
+    let mut out = String::new();
+    z.by_name(name).expect("part").read_to_string(&mut out).expect("utf8");
+    out
+}
+
+/// Rewrite the package, dropping or replacing entries by name.
+fn rewrite(bytes: &[u8], drop: &[&str]) -> Vec<u8> {
+    let mut z = zip::ZipArchive::new(std::io::Cursor::new(bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+    for i in 0..z.len() {
+        let mut f = z.by_index(i).expect("entry");
+        if drop.iter().any(|d| f.name() == *d) {
+            continue;
+        }
+        out.start_file(f.name(), zip::write::SimpleFileOptions::default()).expect("start");
+        std::io::copy(&mut f, &mut out).expect("copy");
+    }
+    out.finish().expect("finish").into_inner()
+}
+
+#[test]
+fn threads_and_resolved_round_trip() {
+    let p = deck();
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let q = deckcraft_pptx::import(&bytes).expect("import");
+    let (a, b) = (&p.slides[0].comments, &q.slides[0].comments);
+    assert_eq!(b.len(), a.len(), "comments duplicated: {b:?}");
+    assert_eq!(b[0].author, "Ada");
+    assert_eq!(b[0].initials, "AL");
+    assert_eq!(b[0].text, "Top thread\nsecond line");
+    assert_eq!(b[0].date, "2025-03-04T05:06:07Z");
+    assert!(b[0].resolved);
+    assert_eq!((b[0].x, b[0].y), (90.0, 45.0));
+    assert_eq!(b[0].replies.len(), 2);
+    assert_eq!(b[0].replies[0].author, "Bob");
+    assert_eq!(b[0].replies[0].text, "A <reply> & more");
+    assert_eq!(b[0].replies[0].date, "2025-03-04T06:00:00Z");
+    assert_eq!(b[0].replies[1].text, "Another reply");
+    assert!(!b[0].replies[0].resolved);
+    assert!(b[0].replies[1].resolved);
+    assert_eq!(b[1].author, "Bob");
+    assert!(!b[1].resolved);
+    assert_eq!(b[1].text, "Open thread");
+}
+
+#[test]
+fn package_carries_both_parts_and_the_slide_anchor() {
+    let bytes = deckcraft_pptx::export(&deck()).expect("export");
+    let modern = part(&bytes, "ppt/comments/modernComment1.xml");
+    assert!(modern.contains("p188:cmLst"), "{modern}");
+    // The thread and the second reply are resolved; the first reply is not.
+    assert_eq!(modern.matches(r#"status="resolved""#).count(), 2, "{modern}");
+    assert!(modern.contains("p188:replyLst") && modern.contains("A &lt;reply&gt; &amp; more"), "{modern}");
+    assert!(modern.contains(r#"<a:t>second line</a:t>"#), "{modern}");
+    let legacy = part(&bytes, "ppt/comments/comment1.xml");
+    assert!(legacy.contains("<p:cm ") && legacy.contains("Top thread"), "{legacy}");
+    let authors = part(&bytes, "ppt/authors.xml");
+    assert!(authors.contains("p188:authorLst") && authors.contains("Ada"), "{authors}");
+    assert!(part(&bytes, "ppt/commentAuthors.xml").contains("p:cmAuthorLst"));
+    let rels = part(&bytes, "ppt/slides/_rels/slide1.xml.rels");
+    assert!(rels.contains("2018/10/relationships/comments"), "{rels}");
+    // The slide's commentRel anchor names the relationship that points at THIS modern part —
+    // the wiring PowerPoint needs and DeckCraft's own reader does not check.
+    let slide = part(&bytes, "ppt/slides/slide1.xml");
+    assert!(slide.contains("commentRel") && slide.contains("{6950BFC3-D8DA-4A85-94F7-54DA5524770B}"), "{slide}");
+    let anchor_at = slide.find("commentRel").expect("anchor");
+    let rid = slide[anchor_at..].split(r#"r:id=""#).nth(1).and_then(|s| s.split('"').next()).expect("anchor r:id");
+    let rel = rels.split("<Relationship ").find(|r| r.contains(&format!(r#"Id="{rid}""#))).expect("anchor rel");
+    assert!(rel.contains("2018/10/relationships/comments") && rel.contains("../comments/modernComment1.xml"), "{rel}");
+    let ct = part(&bytes, "[Content_Types].xml");
+    assert!(ct.contains("application/vnd.ms-powerpoint.comments+xml") && ct.contains("application/vnd.ms-powerpoint.authors+xml"), "{ct}");
+}
+
+/// Comments on several slides: every comment slide gets its own numbered pair of parts and its
+/// own anchor; comment-free slides get none.
+#[test]
+fn comments_on_several_slides_round_trip() {
+    let mut p = deck();
+    let layout = p.slides[0].layout;
+    while p.slides.len() < 3 {
+        let s = defaults::new_slide(&mut p, layout);
+        p.slides.push(Arc::new(s));
+    }
+    let s = Arc::make_mut(&mut p.slides[2]);
+    s.comments = vec![Comment { author: "Cara".into(), text: "Slide three".into(), date: "2025-03-06T00:00:00Z".into(), ..Default::default() }];
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    assert!(part(&bytes, "ppt/comments/modernComment1.xml").contains("Top thread"));
+    // The parts are numbered by comment slide: the comment-free middle slide is skipped.
+    assert!(part(&bytes, "ppt/comments/comment2.xml").contains("Slide three"));
+    assert!(part(&bytes, "ppt/comments/modernComment2.xml").contains("Slide three"));
+    let rels2 = part(&bytes, "ppt/slides/_rels/slide2.xml.rels");
+    assert!(!rels2.contains("relationships/comments"), "{rels2}");
+    let q = deckcraft_pptx::import(&bytes).expect("import");
+    assert_eq!(q.slides[0].comments.len(), 2);
+    assert!(q.slides[1].comments.is_empty());
+    assert_eq!(q.slides[2].comments.len(), 1);
+    assert_eq!(q.slides[2].comments[0].text, "Slide three");
+}
+
+/// A legacy-only package (what older tools read and write) still imports: 1/8 pt positions,
+/// flattened replies.
+#[test]
+fn legacy_only_package_imports() {
+    let bytes = deckcraft_pptx::export(&deck()).expect("export");
+    let trimmed = rewrite(
+        &bytes,
+        &[
+            "ppt/comments/modernComment1.xml",
+            "ppt/authors.xml",
+            "ppt/slides/_rels/slide1.xml.rels", // rewritten below without the modern rel
+        ],
+    );
+    // Re-add the slide rels without the modern-comments relationship and without the anchor ext.
+    let legacy_rels = r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slideLayout" Target="../slideLayouts/slideLayout1.xml"/><Relationship Id="rId2" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/comments" Target="../comments/comment1.xml"/></Relationships>"#;
+    let mut z = zip::ZipArchive::new(std::io::Cursor::new(&trimmed)).expect("zip");
+    let mut out = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+    for i in 0..z.len() {
+        let mut f = z.by_index(i).expect("entry");
+        out.start_file(f.name(), zip::write::SimpleFileOptions::default()).expect("start");
+        if f.name() == "ppt/slides/slide1.xml" {
+            let mut xml = String::new();
+            f.read_to_string(&mut xml).expect("utf8");
+            if let Some(start) = xml.find("<p:extLst>") {
+                let end = xml.find("</p:extLst>").map(|e| e + "</p:extLst>".len()).unwrap_or(xml.len());
+                xml.replace_range(start..end, "");
+            }
+            std::io::Write::write_all(&mut out, xml.as_bytes()).expect("write");
+        } else {
+            std::io::copy(&mut f, &mut out).expect("copy");
+        }
+    }
+    out.start_file("ppt/slides/_rels/slide1.xml.rels", zip::write::SimpleFileOptions::default()).expect("start");
+    std::io::Write::write_all(&mut out, legacy_rels.as_bytes()).expect("write");
+    let legacy_pkg = out.finish().expect("finish").into_inner();
+
+    let q = deckcraft_pptx::import(&legacy_pkg).expect("import");
+    let b = &q.slides[0].comments;
+    // The legacy part flattened the two replies into siblings: four top-level comments.
+    assert_eq!(b.len(), 4, "{b:?}");
+    assert_eq!(b[0].text, "Top thread\nsecond line");
+    // The legacy format has no resolved state — exactly what the modern part adds.
+    assert!(!b[0].resolved);
+    assert_eq!((b[0].x, b[0].y), (90.0, 45.0), "legacy positions are 1/8 pt");
+    assert!(b.iter().all(|c| c.replies.is_empty()));
+}
+
+/// A modern-only package (no legacy part) imports threads and EMU positions.
+#[test]
+fn modern_only_package_imports() {
+    let bytes = deckcraft_pptx::export(&deck()).expect("export");
+    let trimmed = rewrite(&bytes, &["ppt/comments/comment1.xml"]);
+    let q = deckcraft_pptx::import(&trimmed).expect("import");
+    let b = &q.slides[0].comments;
+    assert_eq!(b.len(), 2, "{b:?}");
+    assert_eq!(b[0].replies.len(), 2);
+    assert!(b[0].resolved);
+    assert_eq!((b[0].x, b[0].y), (90.0, 45.0), "modern positions are EMU");
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..b878ba76 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width comments: modern threaded parts written, #70; groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -81,7 +81,7 @@ the round trip even though DeckCraft doesn't model it.
 | Transitions incl. p14/p15 (Vortex, Morph…) | all 48 | all 48 | `every_transition_kind_round_trips` |
 | Animations: timing tree, build paragraphs, triggers, motion paths | yes (flattened to the Animation Pane list) | yes (rebuilt) | `every_animation_effect_survives`; rewind lost (#77) |
 | Comments: legacy | yes | yes | |
-| Comments: modern threaded (`p188`) | yes | no (written as legacy) | Replies and resolved state lost (#70) |
+| Comments: modern threaded (`p188`) | yes | yes | Written next to the flattened legacy part; replies and resolved state round-trip (`threads_and_resolved_round_trip`) |
 | Unknown slide-level elements (`graphicFrame` OLE, extensions, `mc:AlternateContent`) | kept | kept | Rendered as a labelled placeholder with the preview picture when present |
 | Tags, custom XML, VBA | no / no / no | | |
 | Embedded fonts | no | no | |
@@ -103,3 +103,4 @@ the round trip even though DeckCraft doesn't model it.
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
 | 2026-10-10 | major | Created from PowerPoint 16.113.4's `CFBundleDocumentTypes`, `crates/pptx` reader/writer and tests, and the open round-trip issues |
+| 2026-10-13 | minor | Comments: the writer emits the modern threaded part (`p188`) next to the flattened legacy one; the reader prefers the modern part and scales its EMU positions (#70) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..bb7f5881 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (gap 3 shrinks to media options and rewind: comment threads round-trip now, #70; 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -19,7 +19,7 @@ revision history.
 |---|---|---|:-:|---|---|
 | 1 | PPTX never tested against a corpus of real decks | File format | B | 20–35 | [file-format-parity.md](file-format-parity.md) |
 | 2 | Data loss and crashes on common paths (#60, #40, #59) | Stability | B | 6–12 | this file |
-| 3 | PPTX round trip drops comment threads, media options, rewind (#70, #74, #77) | File format | B | 3–6 | [file-format-parity.md](file-format-parity.md) |
+| 3 | PPTX round trip drops media options and rewind (#74, #77) | File format | B | 2–4 | [file-format-parity.md](file-format-parity.md) |
 | 4 | SVG pictures don't render (EMF/WMF do) | File format | B | 6–12 | [file-format-parity.md](file-format-parity.md) |
 | 5 | No localization: English only | Localization | B (infra + 5 languages) | 55–90 | [localization-parity.md](localization-parity.md) |
 | 6 | No printing | Feature | B | 5–8 | [file-format-parity.md](file-format-parity.md) |
@@ -68,12 +68,12 @@ Detail in [file-format-parity.md](file-format-parity.md).
   `standards/test-corpora.md`), add import → render → export → re-import checks, have the owner open
   outputs in PowerPoint, fix what breaks. **Beta blocker.**
 
-### Round trip loses comment threads, media playback options and animation rewind (#70, #74, #77)
-- **Evidence:** issues filed 2026-10-10 by an automated reviewer; the writer emits legacy comments
-  only (no `p188` modern comments with replies and resolved state, though the reader understands
-  them); media playback options and the animation rewind flag aren't written back.
-- **Impact:** a deck opened and saved silently loses review state and show behaviour.
-- **Estimate:** 3–6 h. **Beta blocker.**
+### Round trip loses media playback options and animation rewind (#74, #77)
+- **Evidence:** issues filed 2026-10-10 by an automated reviewer; media playback options and the
+  animation rewind flag aren't written back. Comment threads left with #70: the writer now emits
+  the `p188` modern part next to the legacy one.
+- **Impact:** a deck opened and saved silently loses show behaviour.
+- **Estimate:** 2–4 h. **Beta blocker.**
 
 ### SVG pictures don't render
 - **Evidence:** `crates/render/src/images.rs` decodes through `image` 0.25 (PNG, JPEG, WebP, GIF,
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..20f61615 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -20,7 +20,7 @@ points and lead the beta plan.
 | Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window. Presenter view isn't placed on the second display automatically (drag it there) | 3–5 |
 | Add business content: tables, charts with their data, simple diagrams | partial (not blocking) | Tables with styles, merge/split, all D or P. Charts insert with the common types and edit data in the Chart Data dialog (P0 partial); SmartArt is basic (pre-drawn shapes) | 12–20 |
 | Share the deck: PDF of slides, notes or handouts; images | yes | `file.export` PDF with text layer, links, bookmarks, handouts 1–9; PNG/JPEG. Artwork is raster in the PDF; no direct print (print the PDF) | 10–16 |
-| Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft`; threads are flattened on `.pptx` save (#70); spelling is a small built-in list | 4–8 |
+| Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft` and `.pptx` (#70); spelling is a small built-in list | 4–8 |
 
 ## Current focus (2026-10-10)
 

From 78a99ad1cfc662295c88b4a618a72f751da7a5b0 Mon Sep 17 00:00:00 2001
From: Sazid Al Bayazid <race-relish-stick@duck.com>
Date: Tue, 13 Oct 2026 02:12:23 +0600
Subject: [PATCH 091/376] Start screen: a missing Recent file is marked, its
 error shows, and entries can be removed (#172)

The start screen reported errors through set_status, but the status bar
is only drawn while a presentation is open: clicking a Recent entry
whose file had moved or been deleted did nothing visible, and the same
went for every other start-screen error, like a failed sample open.

The start screen now draws the transient status message itself: a real
label, so screen readers see it too, wrapped so a long OS error does
not clip at the panel edge. Recent entries whose file no longer exists
are dimmed with a "(missing)" mark before anything is clicked, each
entry has a remove button, and a successful open clears a stale error.

Existence is probed once per path per session; a stat on a dead network
share can block for the OS timeout, so UNC paths and URLs are never
probed and are judged when opened instead.

The remove button is a plain multiplication sign: U+2715 has no glyph
in the UI font stack and egui would draw the replacement character.

Tests: the missing mark and the drawn error (kittest, clicked through
the real UI), removal from the list, and the negative case - an
existing file is not marked.
---
 ROADMAP.md                      |   1 +
 crates/ui-egui/src/backstage.rs |  47 +++++++++++--
 crates/ui-egui/src/lib.rs       | 120 ++++++++++++++++++++++++++++++++
 crates/ui-egui/src/status.rs    |  10 +--
 4 files changed, 167 insertions(+), 11 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..aff356bb 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -131,6 +131,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
+| 2026-10-13 | Start screen: a missing Recent file is marked and its click shows the error there; entries can be removed from the list (#172) |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
diff --git a/crates/ui-egui/src/backstage.rs b/crates/ui-egui/src/backstage.rs
index f1d0fde3..6a1980aa 100644
--- a/crates/ui-egui/src/backstage.rs
+++ b/crates/ui-egui/src/backstage.rs
@@ -391,6 +391,14 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                     ui.label(RichText::new(bs.page.label()).font(theme::bold(22.0)).color(t.text));
                     ui.add_space(16.0);
                 }
+                // Errors raised on a backstage page (a missing recent file, a failed open) would
+                // otherwise vanish: the status bar only draws once the backstage is closed (#172).
+                // A real label, not painted text, so screen readers see it too.
+                if let Some(msg) = app.fresh_status() {
+                    ui.label(RichText::new(&msg).font(theme::font(12.0)).color(t.accent));
+                    ui.add_space(8.0);
+                    ui.ctx().request_repaint_after(std::time::Duration::from_millis(500));
+                }
                 match bs.page {
                     Page::Home => home(app, ui, &mut bs, &mut out),
                     Page::New => new_page(app, ui, &mut bs),
@@ -558,6 +566,7 @@ fn recent_list(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize) {
     }
     let width = ui.available_width().min(CONTENT_W);
     for path in list {
+        let missing = !app.recent_exists(&path);
         let (name, folder) = split_path(&path);
         let (rect, resp) = ui.allocate_exact_size(vec2(width, 44.0), Sense::click());
         resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, true, &name));
@@ -565,10 +574,40 @@ fn recent_list(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize) {
         if resp.hovered() {
             p.rect_filled(rect, CornerRadius::same(3), t.hover);
         }
-        icons::paint(p, Rect::from_center_size(pos2(rect.left() + 20.0, rect.center().y), vec2(22.0, 22.0)), Icon::Slide, t.text, false);
-        p.text(pos2(rect.left() + 44.0, rect.center().y - 8.0), Align2::LEFT_CENTER, &name, theme::font(13.0), t.text);
-        p.text(pos2(rect.left() + 44.0, rect.center().y + 9.0), Align2::LEFT_CENTER, &folder, theme::font(11.0), t.text_dim);
-        if resp.on_hover_text(&path).clicked()
+        let ink = if missing { t.text_dim } else { t.text };
+        // The row is as wide as the page's content, which a narrow window clips: keep the mark
+        // and the remove button inside the visible part of the row.
+        let visible_right = rect.right().min(ui.clip_rect().right() - 6.0);
+        {
+            let p = ui.painter();
+            icons::paint(p, Rect::from_center_size(pos2(rect.left() + 20.0, rect.center().y), vec2(22.0, 22.0)), Icon::Slide, ink, false);
+            p.text(pos2(rect.left() + 44.0, rect.center().y - 8.0), Align2::LEFT_CENTER, &name, theme::font(13.0), ink);
+            p.text(pos2(rect.left() + 44.0, rect.center().y + 9.0), Align2::LEFT_CENTER, &folder, theme::font(11.0), t.text_dim);
+            // A missing file says so before it is clicked (#172).
+            if missing {
+                p.text(pos2(visible_right - 82.0, rect.center().y), Align2::RIGHT_CENTER, "(missing)", theme::font(11.0), t.text_dim);
+            }
+        }
+        let resp = if missing {
+            resp.on_hover_text(format!("{path} — this file can't be found"))
+        } else {
+            resp.on_hover_text(&path)
+        };
+        // Remove from the list: a real labelled widget on top of the row, with a code-drawn icon
+        // (a text glyph would need a font that has it).
+        let x = ui.allocate_rect(
+            Rect::from_min_max(pos2(visible_right - 32.0, rect.top() + 5.0), pos2(visible_right, rect.bottom() - 5.0)),
+            Sense::click(),
+        );
+        x.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, true, "Remove from Recent"));
+        if x.hovered() {
+            ui.painter().rect_filled(x.rect, CornerRadius::same(3), t.hover);
+        }
+        icons::paint(ui.painter(), Rect::from_center_size(x.rect.center(), vec2(14.0, 14.0)), Icon::Close, t.text_dim, false);
+        if x.on_hover_text("Remove from Recent").clicked() {
+            app.forget_recent(&path);
+        }
+        if resp.clicked()
             && let Err(e) = app.open_path(&path)
         {
             app.set_status(e);
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..8975ab87 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -28,6 +28,7 @@ pub mod toast;
 pub mod uifonts;
 pub mod widgets;
 
+use std::collections::HashMap;
 use std::sync::mpsc::{Receiver, Sender};
 
 use deckcraft_engine::{Mods, Session, UiRequest};
@@ -44,6 +45,9 @@ pub type DownloadFn = Box<dyn FnMut(&str, &[u8])>;
 /// Files `(name, bytes)` delivered asynchronously by the host (web file picker, dropped files).
 pub type Inbox = std::sync::Arc<std::sync::Mutex<Vec<(String, Vec<u8>)>>>;
 
+/// How long a transient status message stays visible.
+const STATUS_LINGER_MS: f64 = 6000.0;
+
 /// Platform services injected by the host (desktop or web).
 #[derive(Default)]
 pub struct Services {
@@ -227,6 +231,9 @@ pub struct SlideApp {
     pub(crate) thumb_drag: Option<(usize, usize)>,
     /// Selection pane: folded groups, renaming, drag and drop.
     pub selpane: selpane::State,
+    /// Which recent paths exist on disk, probed once per path per session (a dead network share
+    /// must not stall every frame). Not persisted.
+    recent_checked: HashMap<String, bool>,
 }
 
 impl SlideApp {
@@ -267,6 +274,7 @@ impl SlideApp {
             ui_fonts: uifonts::UiFonts::default(),
             thumb_drag: None,
             selpane: selpane::State::default(),
+            recent_checked: HashMap::new(),
         }
     }
 
@@ -279,6 +287,56 @@ impl SlideApp {
         self.status = Some((msg.into(), now_ms()));
     }
 
+    /// The transient status message while it is fresh; clears it once stale. Both the status bar
+    /// and the start screen draw it — the start screen has no status bar, and errors raised there
+    /// (a missing recent file, a failed sample) used to vanish (issue #172).
+    pub fn fresh_status(&mut self) -> Option<String> {
+        let (msg, at) = self.status.clone()?;
+        if now_ms() - at < STATUS_LINGER_MS {
+            Some(msg)
+        } else {
+            self.status = None;
+            None
+        }
+    }
+
+    /// Does this recent path exist on disk? Probed once per path per session and only on
+    /// desktop (the web build has no file system to ask): a stat on a dead network share can
+    /// block for seconds, so it must not repeat on every frame. A stale answer is harmless —
+    /// opening still tries and reports, and a successful open re-probes.
+    pub fn recent_exists(&mut self, path: &str) -> bool {
+        #[cfg(target_arch = "wasm32")]
+        {
+            let _ = path;
+            true
+        }
+        #[cfg(not(target_arch = "wasm32"))]
+        {
+            if let Some(ok) = self.recent_checked.get(path) {
+                return *ok;
+            }
+            // A stat on a dead network location (UNC share, URL) can block for the OS timeout,
+            // so remote-looking paths are never probed: they stay unmarked and are judged when
+            // opened. A disconnected mapped drive would still stall once — accepted.
+            if path.starts_with("\\\\") || path.contains("://") {
+                return true;
+            }
+            let ok = std::path::Path::new(path).is_file();
+            if self.recent_checked.len() > 64 {
+                let live: std::collections::HashSet<&String> = self.ui.recent.iter().collect();
+                self.recent_checked.retain(|p, _| live.contains(p));
+            }
+            self.recent_checked.insert(path.to_string(), ok);
+            ok
+        }
+    }
+
+    /// Drop a path from the Recent list (its file is gone or the user asked for it).
+    pub fn forget_recent(&mut self, path: &str) {
+        self.ui.recent.retain(|p| p != path);
+        self.recent_checked.remove(path);
+    }
+
     /// Run a command by id (UI commands here, everything else in the engine). Errors show in the
     /// status bar and are returned.
     pub fn run(&mut self, id: &str, params: Value) -> Result<Value, String> {
@@ -573,6 +631,8 @@ impl SlideApp {
 
     pub fn open_path(&mut self, path: &str) -> Result<(), String> {
         self.session.execute("file.open", &json!({"path": path})).map_err(|e| e.to_string())?;
+        self.status = None; // an older error (a missing file just before this one) must not linger
+        self.recent_checked.remove(path);
         self.ui.recent.retain(|p| p != path);
         self.ui.recent.insert(0, path.to_string());
         self.ui.recent.truncate(12);
@@ -1135,6 +1195,7 @@ mod tests {
     #![allow(clippy::unwrap_used, clippy::expect_used)]
 
     use super::*;
+    use egui_kittest::kittest::Queryable;
 
     fn title_text(app: &SlideApp) -> String {
         let d = app.session.active().unwrap();
@@ -1408,4 +1469,63 @@ mod tests {
         harness.run_steps(3);
         assert_eq!(harness.state().textures.canvas_renders, n, "an unchanged slide isn't rendered again");
     }
+
+    fn harness() -> egui_kittest::Harness<'static, SlideApp> {
+        egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::new(), Services::default()),
+        )
+    }
+
+    /// #172: a recent file that no longer exists is marked on File › Home, and clicking it draws
+    /// the open error right there (the status bar is hidden while the backstage is open, so the
+    /// message used to vanish).
+    #[test]
+    fn missing_recent_is_marked_and_its_error_shows() {
+        let mut harness = harness();
+        let missing = "/deckcraft-tests/172/missing.deckcraft";
+        harness.state_mut().ui.recent = vec![missing.to_string()];
+        harness.run_steps(2);
+        // The row is labelled with the file's name. Clicking it raises the open error, and the
+        // drawn message is a second node that mentions the name (the OS text after it varies).
+        harness.get_by_label("missing.deckcraft").click();
+        harness.run_steps(2);
+        assert!(harness.state().status.is_some(), "the open error was raised");
+        assert!(
+            harness.get_all_by_label_contains("missing.deckcraft").count() >= 2,
+            "the open error is drawn on the page, next to the entry"
+        );
+    }
+
+    /// #172: a Recent entry can be removed from the list.
+    #[test]
+    fn recent_entry_can_be_removed() {
+        let mut harness = harness();
+        harness.state_mut().ui.recent = vec!["/deckcraft-tests/172/a.deckcraft".into(), "/deckcraft-tests/172/b.deckcraft".into()];
+        harness.run_steps(2);
+        let removes = harness.get_all_by_label("Remove from Recent").collect::<Vec<_>>();
+        assert_eq!(removes.len(), 2);
+        // The remove button must sit inside the visible part of the row even when the page's
+        // content is wider than the window.
+        assert!(removes[1].rect().right() < 1200.0, "reachable in the 1200-wide window: {:?}", removes[1].rect());
+        removes[1].click();
+        harness.run_steps(1);
+        assert_eq!(harness.state().ui.recent, vec!["/deckcraft-tests/172/a.deckcraft"]);
+    }
+
+    /// The existence probe tells present files from missing ones and never touches remote paths.
+    #[test]
+    fn recent_exists_tells_missing_from_present() {
+        let mut app = SlideApp::new(Session::new(), Services::default());
+        let mut path = std::env::temp_dir();
+        path.push(format!("deckcraft-test-172-{}.deckcraft", std::process::id()));
+        std::fs::write(&path, b"").unwrap();
+        assert!(app.recent_exists(&path.to_string_lossy()), "the file exists");
+        assert!(!app.recent_exists("/deckcraft-tests/172/missing.deckcraft"));
+        assert!(app.recent_exists("\\\\server/share/deck.deckcraft"), "UNC paths are never probed");
+        std::fs::remove_file(&path).ok();
+    }
 }
diff --git a/crates/ui-egui/src/status.rs b/crates/ui-egui/src/status.rs
index 8e915b71..026f6526 100644
--- a/crates/ui-egui/src/status.rs
+++ b/crates/ui-egui/src/status.rs
@@ -22,13 +22,9 @@ pub fn status_bar(app: &mut SlideApp, ui: &mut Ui) {
         p.text(pos2(rect.min.x + 14.0, rect.center().y), Align2::LEFT_CENTER, &left, theme::font(12.0), t.text_dim);
         p.text(pos2(rect.min.x + 120.0, rect.center().y), Align2::LEFT_CENTER, "English (United States)", theme::font(12.0), t.text_dim);
         // Transient status message.
-        if let Some((msg, at)) = app.status.clone() {
-            if crate::now_ms() - at < 6000.0 {
-                p.text(pos2(rect.min.x + 290.0, rect.center().y), Align2::LEFT_CENTER, &msg, theme::font(12.0), t.accent);
-                ui.ctx().request_repaint_after(std::time::Duration::from_millis(500));
-            } else {
-                app.status = None;
-            }
+        if let Some(msg) = app.fresh_status() {
+            p.text(pos2(rect.min.x + 290.0, rect.center().y), Align2::LEFT_CENTER, &msg, theme::font(12.0), t.accent);
+            ui.ctx().request_repaint_after(std::time::Duration::from_millis(500));
         }
         let mut right = ui.new_child(
             egui::UiBuilder::new()

From 35312529e1080eb984d4d7e1f953f26106fc23f5 Mon Sep 17 00:00:00 2001
From: NetterSilver <133535268+Silvertree2010@users.noreply.github.com>
Date: Tue, 13 Oct 2026 16:41:57 +0200
Subject: [PATCH 092/376] slide.colorAt: the colour the slide is drawn with at
 a point (#367)

A read-only command, {slide?, x, y (slide units), scale?}: the slide is rendered and
the pixel at the point is returned as {color: "RRGGBB", alpha, x, y}. This is what the
Eyedropper takes, and what scripts and MCP use to read a colour off a slide. A point
outside the slide, a missing or non-numeric coordinate or an unknown slide is an error.
---
 crates/engine/src/cmd/color_at_tests.rs | 73 +++++++++++++++++++++++++
 crates/engine/src/cmd/file.rs           | 36 ++++++++++++
 crates/render/src/lib.rs                | 13 +++++
 3 files changed, 122 insertions(+)
 create mode 100644 crates/engine/src/cmd/color_at_tests.rs

diff --git a/crates/engine/src/cmd/color_at_tests.rs b/crates/engine/src/cmd/color_at_tests.rs
new file mode 100644
index 00000000..77c8d475
--- /dev/null
+++ b/crates/engine/src/cmd/color_at_tests.rs
@@ -0,0 +1,73 @@
+//! `slide.colorAt`, the colour the slide is drawn with at a point: what the Eyedropper takes (#367).
+
+use serde_json::{Value, json};
+
+use crate::*;
+
+fn deck() -> Session {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100]})).unwrap();
+    s.execute("shape.fill", &json!({"color": "#ff0000"})).unwrap();
+    s
+}
+
+fn color_at(s: &mut Session, x: f64, y: f64) -> Value {
+    s.execute("slide.colorAt", &json!({"x": x, "y": y})).unwrap()
+}
+
+#[test]
+fn a_point_in_a_shape_gives_its_fill_and_one_beside_it_the_background() {
+    let mut s = deck();
+    let inside = color_at(&mut s, 150.0, 150.0);
+    assert_eq!(inside["color"], "FF0000");
+    assert_eq!(inside["alpha"], 255);
+    let beside = color_at(&mut s, 700.0, 450.0);
+    assert_ne!(beside["color"], "FF0000");
+    // Just inside and just outside the shape's corner.
+    assert_eq!(color_at(&mut s, 101.0, 101.0)["color"], "FF0000");
+    assert_eq!(color_at(&mut s, 99.0, 99.0)["color"], beside["color"]);
+    // A finer or coarser picture gives the same colour.
+    for scale in [0.5, 1.0, 4.0] {
+        let v = s.execute("slide.colorAt", &json!({"x": 150, "y": 150, "scale": scale})).unwrap();
+        assert_eq!(v["color"], "FF0000", "scale {scale}");
+    }
+    // It is a query: the deck is not changed and nothing goes on the undo stack.
+    let revision = s.doc().unwrap().revision;
+    color_at(&mut s, 150.0, 150.0);
+    assert_eq!(s.doc().unwrap().revision, revision);
+}
+
+#[test]
+fn a_see_through_fill_gives_the_colour_it_is_drawn_with() {
+    let mut s = deck();
+    let background = color_at(&mut s, 700.0, 450.0)["color"].as_str().unwrap().to_string();
+    s.execute("shape.fill", &json!({"transparency": 0.5})).unwrap();
+    let v = color_at(&mut s, 150.0, 150.0);
+    let c = v["color"].as_str().unwrap();
+    assert_ne!(c, "FF0000", "half of the background shows through");
+    assert_ne!(c, background);
+    assert_eq!(v["alpha"], 255, "the slide is opaque");
+}
+
+#[test]
+fn points_outside_the_slide_and_bad_parameters_are_errors() {
+    let mut s = deck();
+    for p in [
+        json!({"x": -1, "y": 10}),
+        json!({"x": 10, "y": -0.5}),
+        json!({"x": 1e9, "y": 10}),
+        json!({"x": 10, "y": 1e9}),
+        json!({"x": 10}),
+        json!({"y": 10}),
+        json!({"x": "10", "y": 10}),
+        json!({"x": 10, "y": 10, "slide": 99}),
+    ] {
+        assert!(s.execute("slide.colorAt", &p).is_err(), "{p}");
+    }
+    // Odd scales are clamped, not refused or crashed on.
+    for scale in [0.0, -3.0, 1e9] {
+        let v = s.execute("slide.colorAt", &json!({"x": 150, "y": 150, "scale": scale}));
+        assert!(v.is_ok(), "{scale}: {v:?}");
+    }
+}
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..1ae227b5 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -26,6 +26,15 @@ pub fn specs() -> Vec<CommandSpec> {
             info
         ),
         cmd!(query "file.render", "Render Slide", [], None, "{slide?: index, scale?, edit?: bool} → {png: base64, width, height}", has_doc, render),
+        cmd!(
+            query "slide.colorAt",
+            "Color At",
+            [],
+            None,
+            "{slide?: index, x, y (slide units), scale?: px per unit (2)} → {color: \"RRGGBB\", alpha: 0..255, x, y}: the colour drawn at a point of the slide (the Eyedropper)",
+            has_doc,
+            color_at
+        ),
         cmd!(noundo "file.close", "Close", ["File"], Some("Cmd+W"), "{}", has_doc, close),
         cmd!(
             "file.properties",
@@ -269,6 +278,29 @@ fn render(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"png": base64_encode(&png), "width": w, "height": h}))
 }
 
+/// The colour the slide is drawn with at one point: what the Eyedropper takes.
+fn color_at(s: &mut Session, p: &Value) -> Result<Value> {
+    let st = s.doc()?;
+    let i = usize_param(p, "slide").unwrap_or(st.selection.slide);
+    if i >= st.doc.slides.len() {
+        return Err(bad("slide.colorAt", format!("no slide {i}")));
+    }
+    let coord = |key: &str| {
+        p.get(key)
+            .and_then(Value::as_f64)
+            .filter(|v| v.is_finite())
+            .ok_or_else(|| bad("slide.colorAt", format!("`{key}` (a number, in slide units) is required")))
+    };
+    let (x, y) = (coord("x")?, coord("y")?);
+    let scale = f64_or(p, "scale", 2.0).clamp(0.01, 16.0);
+    let img = deckcraft_render::render_slide(&st.doc, i, &deckcraft_render::RenderOpts { scale, ..Default::default() });
+    let (px, py) = (x * scale, y * scale);
+    let inside = px >= 0.0 && py >= 0.0 && px < f64::from(img.width) && py < f64::from(img.height);
+    let [r, g, b, a] =
+        img.straight_at(px as u32, py as u32).filter(|_| inside).ok_or_else(|| bad("slide.colorAt", "the point is outside the slide"))?;
+    Ok(json!({"color": format!("{r:02X}{g:02X}{b:02X}"), "alpha": a, "x": x, "y": y}))
+}
+
 fn export(s: &mut Session, p: &Value) -> Result<Value> {
     let path = str_param(p, "path").ok_or_else(|| bad("file.export", "missing `path`"))?.to_string();
     let format = str_param(p, "format").unwrap_or(format_for_path(&path)).to_string();
@@ -430,3 +462,7 @@ fn recovery_discard(s: &mut Session, p: &Value) -> Result<Value> {
     }
     ok()
 }
+
+#[cfg(test)]
+#[path = "color_at_tests.rs"]
+mod color_at_tests;
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..bc0832a9 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -78,6 +78,19 @@ impl Image {
         }
         out
     }
+    /// One pixel as straight (unpremultiplied) RGBA; `None` outside the image.
+    pub fn straight_at(&self, x: u32, y: u32) -> Option<[u8; 4]> {
+        if x >= self.width || y >= self.height {
+            return None;
+        }
+        let i = (y as usize).checked_mul(self.width as usize)?.checked_add(x as usize)?.checked_mul(4)?;
+        let [r, g, b, a] = <[u8; 4]>::try_from(self.pixels.get(i..i.checked_add(4)?)?).ok()?;
+        if a == 0 || a == 255 {
+            return Some([r, g, b, a]);
+        }
+        let unpremultiply = |c: u8| ((c as u32 * 255 + a as u32 / 2) / a as u32).min(255) as u8;
+        Some([unpremultiply(r), unpremultiply(g), unpremultiply(b), a])
+    }
     pub fn to_png(&self) -> Vec<u8> {
         let mut px = self.to_straight();
         px.resize(self.width as usize * self.height as usize * 4, 0);

From 7887a13868f1add6b449a7c74c816540b7c5582b Mon Sep 17 00:00:00 2001
From: NetterSilver <133535268+Silvertree2010@users.noreply.github.com>
Date: Tue, 13 Oct 2026 16:41:57 +0200
Subject: [PATCH 093/376] Colour menus: an Eyedropper that takes a colour from
 the slide (#367)

Every colour menu ends with Eyedropper. Choosing it closes the menu; the pointer is a
crosshair over the slide with the colour under it and its hex beside it, a click takes
the colour (slide.colorAt) and Esc, a right click or a click off the slide cancels.
The colour comes back through the menu that asked, which opens for a frame and returns
it as if its swatch had been clicked, so Shape Fill, Shape Outline, Font Color, the
Format pane and the other callers all apply it their own way without changes.
---
 crates/ui-egui/src/canvas.rs           |   3 +
 crates/ui-egui/src/eyedropper.rs       | 150 +++++++++++++++++++++++++
 crates/ui-egui/src/eyedropper_tests.rs | 113 +++++++++++++++++++
 crates/ui-egui/src/lib.rs              |   7 ++
 crates/ui-egui/src/widgets.rs          |  51 ++++++++-
 5 files changed, 323 insertions(+), 1 deletion(-)
 create mode 100644 crates/ui-egui/src/eyedropper.rs
 create mode 100644 crates/ui-egui/src/eyedropper_tests.rs

diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..7f4c27bf 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -367,6 +367,9 @@ fn ruler(p: &egui::Painter, avail: Rect, slide: Rect, scale: f32, t: &Tokens) {
 }
 
 fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
+    if crate::eyedropper::canvas(app, ui, resp, xf) {
+        return;
+    }
     let tol = (4.0 / xf.scale) as f64;
     let m = mods(ui);
     let Some(pos) = resp.interact_pointer_pos().or(resp.hover_pos()) else { return };
diff --git a/crates/ui-egui/src/eyedropper.rs b/crates/ui-egui/src/eyedropper.rs
new file mode 100644
index 00000000..f6483898
--- /dev/null
+++ b/crates/ui-egui/src/eyedropper.rs
@@ -0,0 +1,150 @@
+//! The Eyedropper in the colour menus (Shape Fill, Shape Outline, Font Color…): choose it, then
+//! click the slide to take the colour drawn under the pointer; Esc or a click elsewhere cancels.
+//!
+//! The menus are drawn by many callers that each apply the colour a swatch gives. The Eyedropper
+//! therefore hands its colour back through the same menu: the menu closes while the pointer picks,
+//! then opens again for one frame and `color_grid` returns the colour as if its swatch had been
+//! clicked, so every caller applies it its own way.
+
+use egui::{Color32, Context, CursorIcon, Id, Pos2, Rect, Stroke, StrokeKind, Ui, pos2, vec2};
+
+use crate::SlideApp;
+use crate::canvas::Xf;
+use crate::theme::{self, Tokens};
+
+const REQUEST: &str = "deckcraft.eyedropper.request";
+const MENU: &str = "deckcraft.eyedropper.menu";
+const RESULT: &str = "deckcraft.eyedropper.result";
+
+/// Pixels per slide unit of the picture the Eyedropper looks at.
+const SCALE: f64 = 2.0;
+
+/// An Eyedropper waiting for a click: the slide as it is drawn and the menu button it came from.
+pub struct State {
+    menu: Id,
+    slide: usize,
+    image: deckcraft_render::Image,
+}
+
+fn key(name: &str) -> Id {
+    Id::new(name)
+}
+
+/// The colour menu button whose menu is open (noted by `color_popup` every frame it is).
+pub fn note_open_menu(ctx: &Context, button: Id) {
+    ctx.data_mut(|d| d.insert_temp(key(MENU), button));
+}
+
+/// The menu button that is open now, if a menu noted itself.
+pub fn open_menu(ctx: &Context) -> Option<Id> {
+    ctx.data(|d| d.get_temp::<Id>(key(MENU)))
+}
+
+/// Keeps `hex` (`RRGGBB`) for the menu on `button`, which opens to hand it to its caller.
+pub fn store_result(ctx: &Context, button: Id, hex: &str) {
+    ctx.data_mut(|d| d.insert_temp(key(RESULT), Some((button, hex.to_string()))));
+}
+
+/// "Eyedropper" was chosen in the open menu.
+pub fn request(ctx: &Context) {
+    ctx.data_mut(|d| d.insert_temp(key(REQUEST), true));
+}
+
+/// Has the Eyedropper taken a colour for the menu on `button`?
+pub fn result_waits_for(ctx: &Context, button: Id) -> bool {
+    ctx.data(|d| d.get_temp::<Option<(Id, String)>>(key(RESULT))).flatten().is_some_and(|(b, _)| b == button)
+}
+
+/// The colour the Eyedropper took (`RRGGBB`), once.
+pub fn take_result(ctx: &Context) -> Option<String> {
+    let r = ctx.data(|d| d.get_temp::<Option<(Id, String)>>(key(RESULT))).flatten();
+    if r.is_some() {
+        ctx.data_mut(|d| d.insert_temp(key(RESULT), None::<(Id, String)>));
+    }
+    r.map(|(_, hex)| hex)
+}
+
+/// Once a frame: start the Eyedropper when a menu asked for it, stop it when something else is
+/// clicked.
+pub fn tick(app: &mut SlideApp, ctx: &Context) {
+    if ctx.data_mut(|d| d.remove_temp::<bool>(key(REQUEST))).unwrap_or(false) {
+        begin(app, ctx);
+    }
+    if app.eyedropper.is_some() {
+        let outside =
+            ctx.input(|i| i.pointer.primary_pressed() && i.pointer.hover_pos().is_some_and(|p| app.canvas_rect.is_none_or(|c| !c.contains(p))));
+        if outside {
+            app.eyedropper = None;
+        }
+    }
+}
+
+fn begin(app: &mut SlideApp, ctx: &Context) {
+    let Some(menu) = open_menu(ctx) else { return };
+    let Some(d) = app.session.active() else { return };
+    if d.selection.target != deckcraft_engine::Target::Slides {
+        app.set_status("The Eyedropper takes colours from a slide");
+        return;
+    }
+    let slide = d.selection.slide;
+    let image = deckcraft_render::render_slide(&d.doc, slide, &deckcraft_render::RenderOpts { scale: SCALE, ..Default::default() });
+    app.eyedropper = Some(State { menu, slide, image });
+    app.set_status("Eyedropper: click the slide (Esc cancels)");
+}
+
+fn hex(c: [u8; 4]) -> String {
+    format!("{:02X}{:02X}{:02X}", c[0], c[1], c[2])
+}
+
+/// The slide canvas while the Eyedropper waits: the pointer is a crosshair with the colour under it
+/// beside it, a click takes it. Returns true when it used the pointer (the tools get none).
+pub fn canvas(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) -> bool {
+    let Some(state) = app.eyedropper.as_ref() else { return false };
+    let escape = ui.input(|i| i.key_pressed(egui::Key::Escape));
+    if escape || resp.secondary_clicked() {
+        app.eyedropper = None;
+        return true;
+    }
+    let Some(pos) = resp.hover_pos() else { return true };
+    let on_slide = app.slide_rect.is_some_and(|r| r.contains(pos));
+    if !on_slide {
+        ui.ctx().set_cursor_icon(CursorIcon::NotAllowed);
+        if resp.clicked() {
+            app.eyedropper = None;
+        }
+        return true;
+    }
+    ui.ctx().set_cursor_icon(CursorIcon::Crosshair);
+    let p = xf.to_slide(pos);
+    let under = state.image.straight_at((p.x * SCALE).max(0.0) as u32, (p.y * SCALE).max(0.0) as u32);
+    if let Some(c) = under {
+        loupe(ui, pos, c);
+    }
+    if resp.clicked() {
+        let (menu, slide) = (state.menu, state.slide);
+        app.eyedropper = None;
+        match app.session.execute("slide.colorAt", &serde_json::json!({"slide": slide, "x": p.x, "y": p.y, "scale": SCALE})) {
+            Ok(v) => {
+                if let Some(color) = v["color"].as_str() {
+                    store_result(ui.ctx(), menu, color);
+                }
+            }
+            Err(e) => app.set_status(e.to_string()),
+        }
+        ui.ctx().request_repaint();
+    }
+    true
+}
+
+/// The colour under the pointer, drawn beside it with its hex.
+fn loupe(ui: &Ui, pos: Pos2, c: [u8; 4]) {
+    let t = Tokens::get(ui.ctx());
+    let painter = ui.ctx().layer_painter(egui::LayerId::new(egui::Order::Tooltip, key("deckcraft.eyedropper.loupe")));
+    let at = pos + vec2(18.0, 18.0);
+    let swatch = Rect::from_min_size(at, vec2(64.0, 26.0));
+    painter.rect(swatch, 3, Color32::from_rgb(c[0], c[1], c[2]), Stroke::new(2.0, Color32::WHITE), StrokeKind::Outside);
+    painter.rect_stroke(swatch.expand(2.0), 3, Stroke::new(1.0, t.border), StrokeKind::Outside);
+    let label = Rect::from_min_size(pos2(at.x, swatch.max.y + 5.0), vec2(64.0, 16.0));
+    painter.rect_filled(label, 3, Color32::WHITE);
+    painter.text(label.center(), egui::Align2::CENTER_CENTER, format!("#{}", hex(c)), theme::bold(11.0), Color32::BLACK);
+}
diff --git a/crates/ui-egui/src/eyedropper_tests.rs b/crates/ui-egui/src/eyedropper_tests.rs
new file mode 100644
index 00000000..245c4be2
--- /dev/null
+++ b/crates/ui-egui/src/eyedropper_tests.rs
@@ -0,0 +1,113 @@
+//! The Eyedropper on the slide canvas through real egui input.
+#![allow(clippy::unwrap_used, clippy::expect_used)]
+
+use deckcraft_engine::Session;
+use egui::{Event, Id, Key, Modifiers, PointerButton, Pos2};
+use egui_kittest::Harness;
+use serde_json::json;
+
+use crate::eyedropper::{note_open_menu, request, result_waits_for, take_result};
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut session = Session::with_new();
+    session.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    session.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100]})).unwrap();
+    session.execute("shape.fill", &json!({"color": "#ff0000"})).unwrap();
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SlideApp::new(session, Services::default()),
+    );
+    h.run_steps(4);
+    h
+}
+
+fn menu() -> Id {
+    Id::new("test-menu")
+}
+
+/// A colour menu asked for the Eyedropper.
+fn ask(h: &mut Harness<'static, SlideApp>) {
+    note_open_menu(&h.ctx, menu());
+    request(&h.ctx);
+    h.run_steps(3);
+}
+
+/// Where a point of the slide is on screen.
+fn at(h: &Harness<'static, SlideApp>, x: f32, y: f32) -> Pos2 {
+    let app = h.state();
+    let r = app.slide_rect.expect("the slide is drawn");
+    r.min + egui::vec2(x, y) * app.canvas_scale
+}
+
+fn click(h: &mut Harness<'static, SlideApp>, pos: Pos2) {
+    h.input_mut().events.push(Event::PointerMoved(pos));
+    h.run_steps(2);
+    for pressed in [true, false] {
+        h.input_mut().events.push(Event::PointerButton { pos, button: PointerButton::Primary, pressed, modifiers: Modifiers::NONE });
+        h.run_steps(2);
+    }
+    h.run_steps(2);
+}
+
+fn selection(h: &Harness<'static, SlideApp>) -> Vec<u32> {
+    h.state().session.doc().unwrap().selection.shapes.iter().map(|s| s.0).collect()
+}
+
+#[test]
+fn a_click_on_the_slide_takes_the_colour_under_it_and_nothing_else_happens() {
+    let mut h = harness();
+    let before = selection(&h);
+    let revision = h.state().session.doc().unwrap().revision;
+    ask(&mut h);
+    assert!(h.state().eyedropper.is_some(), "asking starts the Eyedropper");
+    // A hover shows the colour; nothing is chosen yet.
+    let on_shape = at(&h, 150.0, 150.0);
+    h.input_mut().events.push(Event::PointerMoved(on_shape));
+    h.run_steps(3);
+    assert!(h.state().eyedropper.is_some() && !result_waits_for(&h.ctx, menu()));
+    click(&mut h, on_shape);
+    assert!(h.state().eyedropper.is_none(), "one click ends it");
+    assert!(result_waits_for(&h.ctx, menu()), "the colour waits for the menu that asked");
+    assert_eq!(take_result(&h.ctx).as_deref(), Some("FF0000"), "the red of the shape under the pointer");
+    assert_eq!(take_result(&h.ctx), None, "taken once");
+    assert_eq!(selection(&h), before, "the click did not select or move anything");
+    // The slide itself is untouched, and the next click is an ordinary click again.
+    assert_eq!(h.state().session.doc().unwrap().revision, revision, "the deck is untouched");
+    // Beside the shape the same click takes the slide's background instead.
+    ask(&mut h);
+    let empty = at(&h, 700.0, 450.0);
+    click(&mut h, empty);
+    let bg = take_result(&h.ctx).expect("a colour");
+    assert_ne!(bg, "FF0000");
+}
+
+#[test]
+fn escape_and_a_click_off_the_slide_take_nothing() {
+    let mut h = harness();
+    ask(&mut h);
+    let on_shape = at(&h, 150.0, 150.0);
+    h.input_mut().events.push(Event::PointerMoved(on_shape));
+    h.run_steps(2);
+    for pressed in [true, false] {
+        h.input_mut().events.push(Event::Key { key: Key::Escape, physical_key: None, pressed, repeat: false, modifiers: Modifiers::NONE });
+        h.run_steps(2);
+    }
+    assert!(h.state().eyedropper.is_none(), "Esc cancels");
+    assert_eq!(take_result(&h.ctx), None);
+
+    ask(&mut h);
+    let off = h.state().slide_rect.unwrap().min - egui::vec2(10.0, 10.0);
+    click(&mut h, off);
+    assert!(h.state().eyedropper.is_none(), "a click beside the slide cancels");
+    assert_eq!(take_result(&h.ctx), None);
+
+    // Without an open colour menu there is nothing to hand a colour to.
+    let mut other = harness();
+    request(&other.ctx);
+    other.run_steps(3);
+    assert!(other.state().eyedropper.is_none());
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..0937ccb9 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -11,6 +11,7 @@ pub mod canvas;
 pub mod control;
 pub mod credits;
 pub mod dialogs;
+pub mod eyedropper;
 pub mod fillui;
 pub mod icons;
 pub mod media;
@@ -197,6 +198,8 @@ pub struct SlideApp {
     pub synthetic: Vec<egui::Event>,
     /// Canvas screen rect and points-per-slide-point scale (for control & tests).
     pub canvas_rect: Option<egui::Rect>,
+    /// The Eyedropper is waiting for a click on the slide.
+    pub eyedropper: Option<eyedropper::State>,
     pub canvas_scale: f32,
     pub slide_rect: Option<egui::Rect>,
     /// Where the canvas texture (the slide and the pasteboard drawn around it) is on screen.
@@ -247,6 +250,7 @@ impl SlideApp {
             perf: Perf { frame_ms: 0.0, render_ms: 0.0, fps: 0.0 },
             synthetic: vec![],
             canvas_rect: None,
+            eyedropper: None,
             canvas_scale: 1.0,
             slide_rect: None,
             canvas_region: None,
@@ -935,6 +939,7 @@ impl SlideApp {
         let t0 = now_ms();
         let t = theme::Tokens::get(&ctx);
         self.tick_media(&ctx);
+        eyedropper::tick(self, &ctx);
         if self.show.is_some() {
             show::ui(self, ui);
             self.perf.frame_ms = now_ms() - t0;
@@ -1127,6 +1132,8 @@ fn js_now() -> f64 {
     js_sys::Date::now()
 }
 
+#[cfg(test)]
+mod eyedropper_tests;
 #[cfg(test)]
 mod ime_tests;
 
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 5827b396..fadefe8b 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -243,12 +243,25 @@ pub fn dropdown(ui: &mut Ui, id: &str, current: &str, width: f32, enabled: bool,
 /// (egui menus close on any click inside). Picking a colour closes it (`color_grid` calls
 /// `ui.close()`); other buttons in it must close it themselves.
 pub fn color_popup(button: &Response) -> egui::Popup<'_> {
-    egui::Popup::menu(button).close_behavior(egui::PopupCloseBehavior::CloseOnClickOutside)
+    let mut popup = egui::Popup::menu(button).close_behavior(egui::PopupCloseBehavior::CloseOnClickOutside);
+    // A colour the Eyedropper took for this menu: open it so `color_grid` hands the colour back.
+    if crate::eyedropper::result_waits_for(&button.ctx, button.id) {
+        popup = popup.open_memory(egui::SetOpenCommand::Bool(true));
+    }
+    if popup.is_open() {
+        crate::eyedropper::note_open_menu(&button.ctx, button.id);
+    }
+    popup
 }
 
 /// The colour grid popup body: theme colours with tints/shades, standard colours, extra entries.
 /// Returns the picked colour (`Some(None)` = "No Fill"/"Automatic" when `none_label` is given).
 pub fn color_grid(ui: &mut Ui, scheme: &ColorScheme, none_label: Option<&str>) -> Option<Option<ColorRef>> {
+    // The Eyedropper's colour, handed back as if its swatch had been clicked.
+    if let Some(c) = crate::eyedropper::take_result(ui.ctx()).and_then(|hex| Rgba::from_hex(&hex)) {
+        ui.close();
+        return Some(Some(ColorRef::rgb(c)));
+    }
     let t = Tokens::get(ui.ctx());
     let mut out = None;
     ui.set_min_width(220.0);
@@ -343,6 +356,10 @@ pub fn color_grid(ui: &mut Ui, scheme: &ColorScheme, none_label: Option<&str>) -
         }
     });
     ui.data_mut(|d| d.insert_temp(id, hex));
+    if ui.button("Eyedropper").on_hover_text("Click the slide to take the colour under the pointer").clicked() {
+        crate::eyedropper::request(ui.ctx());
+        ui.close();
+    }
     if out.is_some() {
         ui.close();
     }
@@ -485,4 +502,36 @@ mod tests {
         assert_eq!(*picked.borrow(), Some(Some(ColorRef::rgb(Rgba::from_hex("00FF00").unwrap()))));
         assert!(harness.query_by_role(Role::TextInput).is_none(), "picking a colour closes the menu");
     }
+
+    /// Choosing Eyedropper closes the menu and asks for it; the colour it takes comes back through
+    /// the same menu, as if its swatch had been clicked.
+    #[test]
+    fn the_eyedroppers_colour_comes_back_through_the_menu_that_asked() {
+        let picked = RefCell::new(None);
+        let scheme = deckcraft_model::Theme::default().colors;
+        let mut harness = egui_kittest::Harness::builder().with_size(vec2(400.0, 500.0)).build_ui(|ui| {
+            theme::install_fonts(ui.ctx());
+            let r = ui.button("Pick");
+            color_popup(&r).show(|ui| {
+                if let Some(c) = color_grid(ui, &scheme, None) {
+                    *picked.borrow_mut() = Some(c);
+                }
+            });
+        });
+        harness.get_by_label("Pick").click();
+        harness.run();
+        harness.get_by_label("Eyedropper").click();
+        harness.run();
+        assert!(harness.query_by_label("Eyedropper").is_none(), "choosing it closes the menu");
+        assert!(picked.borrow().is_none(), "nothing is picked yet");
+        // The app starts the Eyedropper from this request; here the colour is taken at once.
+        assert!(harness.ctx.data_mut(|d| d.remove_temp::<bool>(egui::Id::new("deckcraft.eyedropper.request"))).unwrap_or(false));
+        let menu = crate::eyedropper::open_menu(&harness.ctx).expect("the open menu noted its button");
+        crate::eyedropper::store_result(&harness.ctx, menu, "00FF00");
+        harness.run();
+        assert_eq!(*picked.borrow(), Some(Some(ColorRef::rgb(Rgba::from_hex("00FF00").unwrap()))));
+        assert!(harness.query_by_label("Eyedropper").is_none(), "the menu closes again");
+        harness.run();
+        assert_eq!(picked.borrow().iter().count(), 1, "the colour is handed back once");
+    }
 }

From 12dd39270568dcd7ce5c90df3db78e569238cbe8 Mon Sep 17 00:00:00 2001
From: NetterSilver <133535268+Silvertree2010@users.noreply.github.com>
Date: Tue, 13 Oct 2026 16:41:57 +0200
Subject: [PATCH 094/376] Docs: update the progress docs for this change

---
 ROADMAP.md        | 2 ++
 docs/ui-parity.md | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..1ea564a2 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Eyedropper: Shape Fill, Shape Outline, Font Color and every other colour menu end with an Eyedropper that takes the colour drawn at a point of the slide (hover shows it, a click applies it, Esc cancels); `slide.colorAt` gives the same from scripts and MCP (#367) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: Eyedropper in the colour menus, slide.colorAt (#367) |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..aad90843 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (Eyedropper in the colour menus (#367); previously minor: File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -17,6 +17,7 @@ AGENTS.md §2). Dimension score: **~60% ready** (estimated), **30–50 h** to pa
 | Native macOS menu bar (File, Edit, View, Insert, Format, Arrange, Tools, Slide Show, Window, Help) | yes | **no** (`menus::menu_tree()` is defined but not installed) | 3–5 h |
 | Menu-bar items with a DeckCraft equivalent | 217 app-specific items | 128 matched by name (59%, heuristic lower bound) | See [target-app-parity.md](target-app-parity.md) |
 | Ribbon tabs: Home, Insert, Draw, Design, Transitions, Animations, Slide Show, Record, Review, View | 10 | 10 | Record tab is a placeholder |
+| Colour menus: theme and standard colours, hex field, Eyedropper | yes (plus a More Colors dialog) | yes: theme and standard colours, hex field and an Eyedropper that takes the colour drawn under the pointer on the slide (#367) | More Colors dialog; Eyedropper only takes colours from the slide, not the rest of the screen |
 | Contextual tabs: Shape Format, Picture Format, Table Design, Table Layout, Chart Design, Chart Format, Video/Audio Format and Playback | yes | most; checklist P0 row partial | Chart Format, media tabs thinner |
 | File tab (Backstage): Home, New, Open, Info, Save, Save As, Print, Share, Export, Close, Account, Options | yes | yes (#76), see [File tab](#file-tab-backstage); no Share (cloud) | Video/GIF/CD exports, templates beyond the built-in themes |
 | Start screen: new, themes, templates, recent, open | yes, the same page as File › Home | yes: File › Home with Home, New, Open, Account and Options (#76) | |
@@ -148,6 +149,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Eyedropper in the colour menus (#367) |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 4fee02636adfa22c0738c760f5ea0e9a4c249442 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 17:57:34 +0300
Subject: [PATCH 095/376] Metafile: clip EMF and WMF drawing to rectangle
 regions

INTERSECTCLIPRECT, EXCLUDECLIPRECT and EXTSELECTCLIPRGN limit what later records paint, including a region made of several rectangles. A rotated map stores the bounds of the clip rectangle.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                    |   2 +
 crates/metafile/src/canvas.rs | 141 +++++++++++++++++++++----
 crates/metafile/src/clip.rs   | 193 ++++++++++++++++++++++++++++++++++
 crates/metafile/src/emf.rs    |  37 +++++++
 crates/metafile/src/lib.rs    |  63 ++++++++---
 crates/metafile/src/place.rs  |  42 +++++---
 crates/metafile/src/tests.rs  | 110 ++++++++++++++++---
 crates/metafile/src/text.rs   |   3 +
 crates/metafile/src/wmf.rs    |   3 +
 crates/render/src/metafile.rs |  35 +++---
 crates/render/src/tests.rs    |  30 ++++++
 docs/file-format-parity.md    |   7 +-
 docs/gaps.md                  |  13 +--
 13 files changed, 594 insertions(+), 85 deletions(-)
 create mode 100644 crates/metafile/src/clip.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..c5e3aa33 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | EMF and WMF rectangle clip regions (`INTERSECTCLIPRECT`, `EXCLUDECLIPRECT`, `EXTSELECTCLIPRGN`) limit later drawing. EMF+ records are still skipped |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: EMF/WMF rectangle clip regions |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/metafile/src/canvas.rs b/crates/metafile/src/canvas.rs
index 4ffa56bf..55abe0f1 100644
--- a/crates/metafile/src/canvas.rs
+++ b/crates/metafile/src/canvas.rs
@@ -4,6 +4,7 @@
 
 use std::sync::{Arc, OnceLock};
 
+use crate::clip::{self, MAX_CLIP_RECTS};
 use crate::dib::Rgba;
 use crate::geom::{Op, P};
 use crate::text::{ETO_CLIPPED, ETO_OPAQUE, Font, TA_UPDATECP, Text, align};
@@ -244,19 +245,39 @@ pub(crate) enum Raw {
         fill: Option<[u8; 4]>,
         stroke: Option<([u8; 4], f64)>,
         even_odd: bool,
+        /// Device-space clip region. None is the default clip.
+        region: Option<Vec<[f64; 4]>>,
     },
     /// A path filled with a repeating tile.
     Pattern {
         ops: Vec<Op>,
         even_odd: bool,
         tile: Arc<RawTile>,
+        region: Option<Vec<[f64; 4]>>,
     },
     Bitmap {
         rect: [f64; 4],
         img: Rgba,
+        region: Option<Vec<[f64; 4]>>,
     },
-    /// Text whose transform and clip are in device units.
-    Text(Box<Text>),
+    /// Text whose transform and clip are in device units. `region` is the device clip.
+    Text {
+        text: Box<Text>,
+        region: Option<Vec<[f64; 4]>>,
+    },
+}
+
+impl Raw {
+    fn set_region(&mut self, region: Option<Vec<[f64; 4]>>) {
+        match self {
+            Raw::Path { region: slot, .. }
+            | Raw::Pattern { region: slot, .. }
+            | Raw::Bitmap { region: slot, .. }
+            | Raw::Text { region: slot, .. } => {
+                *slot = region;
+            }
+        }
+    }
 }
 
 /// Text drawing state: colours, background mode, alignment and the selected font.
@@ -277,6 +298,7 @@ struct Saved {
     even_odd: bool,
     rop2: u32,
     text: TextState,
+    clip: Option<Vec<[f64; 4]>>,
 }
 
 pub(crate) struct Canvas {
@@ -304,6 +326,10 @@ pub(crate) struct Canvas {
     in_path: bool,
     path: Vec<Op>,
     full: bool,
+    /// Current clip in device units. None is the default (the whole surface); Some([]) draws nothing.
+    clip: Option<Vec<[f64; 4]>>,
+    /// Device bounds of the picture, so excluding from the default clip has a surface to cut.
+    surface: Option<[f64; 4]>,
 }
 
 impl Canvas {
@@ -327,15 +353,26 @@ impl Canvas {
             in_path: false,
             path: Vec::new(),
             full: false,
+            clip: None,
+            surface: None,
         }
     }
 
+    /// Device bounds `[x0, y0, x1, y1]` of the picture. Used when a clip record cuts the default clip.
+    pub fn set_clip_surface(&mut self, rect: [f64; 4]) {
+        self.surface = clip::normalize(rect);
+    }
+
     /// True once the item cap is hit; the readers stop there and keep what they have.
     pub fn full(&self) -> bool {
         self.full
     }
 
-    fn push(&mut self, raw: Raw) {
+    fn push(&mut self, mut raw: Raw) {
+        if self.clip.as_ref().is_some_and(Vec::is_empty) {
+            return;
+        }
+        raw.set_region(self.clip.clone());
         let cost = match &raw {
             Raw::Path { ops, .. } => ops.len() * std::mem::size_of::<Op>(),
             // A tile shared with its brush is counted once (by the brush); one made for this fill
@@ -345,7 +382,7 @@ impl Canvas {
                 ops.len() * std::mem::size_of::<Op>() + 64 + own
             }
             Raw::Bitmap { img, .. } => img.px.len(),
-            Raw::Text(t) => t.text.len() + t.dx.len() * 4 + t.font.family.len() + 128,
+            Raw::Text { text: t, .. } => t.text.len() + t.dx.len() * 4 + t.font.family.len() + 128,
         };
         if self.items.len() >= MAX_ITEMS || self.used.saturating_add(cost) > MAX_BYTES {
             self.full = true;
@@ -453,6 +490,7 @@ impl Canvas {
                 even_odd: self.even_odd,
                 rop2: self.rop2,
                 text: self.text.clone(),
+                clip: self.clip.clone(),
             });
         } else {
             self.full = true;
@@ -471,6 +509,61 @@ impl Canvas {
         self.even_odd = s.even_odd;
         self.rop2 = s.rop2;
         self.text = s.text;
+        self.clip = s.clip;
+    }
+
+    /// The logical rectangle as a device rectangle. A scale or translation keeps the rectangle; a
+    /// rotation stores the bounds of the rotated corners.
+    fn device_rect(&self, [l, t, r, b]: [f64; 4]) -> Option<[f64; 4]> {
+        let corners = [(l, t), (r, t), (l, b), (r, b)].map(|p| self.map.device(p));
+        if !corners.iter().all(|p| p.0.is_finite() && p.1.is_finite()) {
+            return None;
+        }
+        let (mut x0, mut y0, mut x1, mut y1) = (f64::INFINITY, f64::INFINITY, f64::NEG_INFINITY, f64::NEG_INFINITY);
+        for p in corners {
+            x0 = x0.min(p.0);
+            y0 = y0.min(p.1);
+            x1 = x1.max(p.0);
+            y1 = y1.max(p.1);
+        }
+        clip::normalize([x0, y0, x1, y1])
+    }
+
+    fn map_rects(&self, logical: &[[f64; 4]]) -> Vec<[f64; 4]> {
+        let mut out = Vec::new();
+        for r in logical.iter().take(MAX_CLIP_RECTS) {
+            if let Some(d) = self.device_rect(*r) {
+                out.push(d);
+            }
+            if out.len() >= MAX_CLIP_RECTS {
+                break;
+            }
+        }
+        out
+    }
+
+    /// INTERSECTCLIPRECT: later drawing is limited to this logical rectangle as well.
+    pub fn intersect_clip_rect(&mut self, logical: [f64; 4]) {
+        self.clip = match self.device_rect(logical) {
+            Some(rect) => clip::intersect(self.clip.clone(), rect),
+            None => Some(Vec::new()),
+        };
+    }
+
+    /// EXCLUDECLIPRECT: this logical rectangle is removed from the clip.
+    pub fn exclude_clip_rect(&mut self, logical: [f64; 4]) {
+        let Some(rect) = self.device_rect(logical) else { return };
+        self.clip = clip::exclude(self.clip.clone(), rect, self.surface);
+    }
+
+    /// EXTSELECTCLIPRGN: combine these logical rectangles with the clip in a `RGN_*` mode.
+    pub fn select_clip_rects(&mut self, logical: &[[f64; 4]], mode: u32) {
+        self.clip = clip::combine(self.clip.clone(), self.map_rects(logical), mode, self.surface);
+    }
+
+    /// The default clip: later records are not limited by a region.
+    pub fn reset_clip(&mut self) {
+        self.clip = None;
     }
 
     /// Stores an object in `slot` (EMF index), or in the first free slot (WMF handle table).
@@ -603,14 +696,14 @@ impl Canvas {
         match fill {
             Some(Paint::Tile(tile)) => {
                 if stroke.is_some() {
-                    self.push(Raw::Pattern { ops: ops.clone(), even_odd, tile });
-                    self.push(Raw::Path { ops, fill: None, stroke, even_odd });
+                    self.push(Raw::Pattern { ops: ops.clone(), even_odd, tile, region: None });
+                    self.push(Raw::Path { ops, fill: None, stroke, even_odd, region: None });
                 } else {
-                    self.push(Raw::Pattern { ops, even_odd, tile });
+                    self.push(Raw::Pattern { ops, even_odd, tile, region: None });
                 }
             }
-            Some(Paint::Solid(c)) => self.push(Raw::Path { ops, fill: Some(c), stroke, even_odd }),
-            None if stroke.is_some() => self.push(Raw::Path { ops, fill: None, stroke, even_odd }),
+            Some(Paint::Solid(c)) => self.push(Raw::Path { ops, fill: Some(c), stroke, even_odd, region: None }),
+            None if stroke.is_some() => self.push(Raw::Path { ops, fill: None, stroke, even_odd, region: None }),
             None => {}
         }
     }
@@ -755,7 +848,7 @@ impl Canvas {
     /// Fills a logical rectangle `[l, t, r, b]` with a solid colour (ROP fills such as BLACKNESS).
     pub fn fill_rect_with(&mut self, [l, t, r, b]: [f64; 4], color: [u8; 4]) {
         let dev: Vec<Op> = crate::geom::rect(l, t, r, b).iter().map(|o| self.map_op(*o)).collect();
-        self.push(Raw::Path { ops: dev, fill: Some(color), stroke: None, even_odd: true });
+        self.push(Raw::Path { ops: dev, fill: Some(color), stroke: None, even_odd: true, region: None });
     }
 
     /// Whether a raster operation draws without a source bitmap (PATCOPY, BLACKNESS, WHITENESS).
@@ -831,17 +924,21 @@ impl Canvas {
             }
             _ => None,
         };
-        self.push(Raw::Text(Box::new(Text {
-            transform: [sx * c, sx * s, -sy * s, sy * c, o.0, o.1],
-            text,
-            dx,
-            font: lf.font,
-            color: self.text.color,
-            background: self.text.bk_opaque.then_some(self.text.bk_color),
-            h_align,
-            v_align,
-            clip,
-        })));
+        self.push(Raw::Text {
+            text: Box::new(Text {
+                transform: [sx * c, sx * s, -sy * s, sy * c, o.0, o.1],
+                text,
+                dx,
+                font: lf.font,
+                color: self.text.color,
+                background: self.text.bk_opaque.then_some(self.text.bk_color),
+                h_align,
+                v_align,
+                clip,
+                region: None,
+            }),
+            region: None,
+        });
     }
 
     /// A bitmap stretched into a logical rectangle `[x, y, w, h]`. A negative extent mirrors the
@@ -852,7 +949,7 @@ impl Canvas {
         let b = self.map.device((x + w, y + h));
         crate::dib::flip(&mut img, a.0 > b.0, a.1 > b.1);
         let dev = [a.0.min(b.0), a.1.min(b.1), (b.0 - a.0).abs(), (b.1 - a.1).abs()];
-        self.push(Raw::Bitmap { rect: dev, img });
+        self.push(Raw::Bitmap { rect: dev, img, region: None });
     }
 }
 
diff --git a/crates/metafile/src/clip.rs b/crates/metafile/src/clip.rs
new file mode 100644
index 00000000..2fc88ca4
--- /dev/null
+++ b/crates/metafile/src/clip.rs
@@ -0,0 +1,193 @@
+//! Clipping regions for EMF and WMF (MS-EMF 2.3.12, MS-WMF 2.3.5).
+//!
+//! A region is a set of axis-aligned rectangles in device units: `None` is the default clip (the
+//! whole surface), `Some([])` draws nothing, and `Some(rects)` is their union. That is how GDI
+//! stores a region (`RGNDATA` is a list of rectangles). Counts are capped so a hostile file cannot
+//! grow the set without bound; past the cap, extra rectangles are dropped, which can only hide
+//! drawing.
+
+/// Rectangles kept from one region. Past this, further rectangles are dropped.
+pub(crate) const MAX_CLIP_RECTS: usize = 64;
+
+pub(crate) const RGN_AND: u32 = 1;
+pub(crate) const RGN_OR: u32 = 2;
+pub(crate) const RGN_XOR: u32 = 3;
+pub(crate) const RGN_DIFF: u32 = 4;
+pub(crate) const RGN_COPY: u32 = 5;
+
+/// A rectangle `[x0, y0, x1, y1]` with a positive area, or none.
+pub(crate) fn normalize(rect: [f64; 4]) -> Option<[f64; 4]> {
+    let [l, t, r, b] = rect;
+    if ![l, t, r, b].iter().all(|v| v.is_finite()) {
+        return None;
+    }
+    let (x0, x1) = (l.min(r), l.max(r));
+    let (y0, y1) = (t.min(b), t.max(b));
+    (x1 - x0 > 1e-6 && y1 - y0 > 1e-6).then_some([x0, y0, x1, y1])
+}
+
+fn intersection(a: [f64; 4], b: [f64; 4]) -> Option<[f64; 4]> {
+    let (x0, y0) = (a[0].max(b[0]), a[1].max(b[1]));
+    let (x1, y1) = (a[2].min(b[2]), a[3].min(b[3]));
+    (x1 - x0 > 1e-6 && y1 - y0 > 1e-6 && [x0, y0, x1, y1].iter().all(|v| v.is_finite())).then_some([x0, y0, x1, y1])
+}
+
+/// `a` with `b` removed, as up to four rectangles.
+fn subtract_one(a: [f64; 4], b: [f64; 4]) -> Vec<[f64; 4]> {
+    let Some(i) = intersection(a, b) else { return vec![a] };
+    let mut out = Vec::new();
+    if i[1] > a[1]
+        && let Some(r) = normalize([a[0], a[1], a[2], i[1]])
+    {
+        out.push(r);
+    }
+    if i[3] < a[3]
+        && let Some(r) = normalize([a[0], i[3], a[2], a[3]])
+    {
+        out.push(r);
+    }
+    if i[0] > a[0]
+        && let Some(r) = normalize([a[0], i[1], i[0], i[3]])
+    {
+        out.push(r);
+    }
+    if i[2] < a[2]
+        && let Some(r) = normalize([i[2], i[1], a[2], i[3]])
+    {
+        out.push(r);
+    }
+    out
+}
+
+fn cap(mut rects: Vec<[f64; 4]>) -> Vec<[f64; 4]> {
+    rects.truncate(MAX_CLIP_RECTS);
+    rects
+}
+
+fn subtract_all(subject: Vec<[f64; 4]>, cuts: &[[f64; 4]]) -> Vec<[f64; 4]> {
+    let mut cur = subject;
+    for cut in cuts {
+        let mut next = Vec::new();
+        for s in cur {
+            for piece in subtract_one(s, *cut) {
+                if next.len() >= MAX_CLIP_RECTS {
+                    return next;
+                }
+                next.push(piece);
+            }
+        }
+        cur = next;
+    }
+    cur
+}
+
+/// Intersects the current region with one rectangle.
+pub(crate) fn intersect(current: Option<Vec<[f64; 4]>>, rect: [f64; 4]) -> Option<Vec<[f64; 4]>> {
+    let Some(rect) = normalize(rect) else { return Some(Vec::new()) };
+    Some(match current {
+        None => vec![rect],
+        Some(rects) => cap(rects.iter().filter_map(|r| intersection(*r, rect)).collect()),
+    })
+}
+
+/// Removes one rectangle. `surface` is the device bounds, used when the clip is still the default
+/// (the whole surface) so the remainder can be named.
+pub(crate) fn exclude(current: Option<Vec<[f64; 4]>>, rect: [f64; 4], surface: Option<[f64; 4]>) -> Option<Vec<[f64; 4]>> {
+    let Some(rect) = normalize(rect) else { return current };
+    match current {
+        Some(rects) => Some(subtract_all(rects, &[rect])),
+        None => surface.and_then(normalize).map(|s| subtract_all(vec![s], &[rect])),
+    }
+}
+
+/// Combines `incoming` with the current region in a region mode (`RGN_*`). An unknown mode leaves
+/// the region as it was. `RGN_COPY` replaces it. An `RGN_OR` or `RGN_XOR` against the default clip
+/// stays the default clip: the whole surface already covers the incoming rectangles.
+pub(crate) fn combine(current: Option<Vec<[f64; 4]>>, incoming: Vec<[f64; 4]>, mode: u32, surface: Option<[f64; 4]>) -> Option<Vec<[f64; 4]>> {
+    let incoming: Vec<[f64; 4]> = cap(incoming.iter().copied().filter_map(normalize).collect());
+    match mode {
+        RGN_COPY => Some(incoming),
+        RGN_AND => match current {
+            None => Some(incoming),
+            Some(rects) => {
+                let mut out = Vec::new();
+                for a in &rects {
+                    for b in &incoming {
+                        if out.len() >= MAX_CLIP_RECTS {
+                            return Some(out);
+                        }
+                        if let Some(r) = intersection(*a, *b) {
+                            out.push(r);
+                        }
+                    }
+                }
+                Some(out)
+            }
+        },
+        RGN_OR => match current {
+            None => None,
+            Some(mut rects) => {
+                rects.extend(incoming);
+                Some(cap(rects))
+            }
+        },
+        RGN_DIFF => match current {
+            Some(rects) => Some(subtract_all(rects, &incoming)),
+            None => surface.and_then(normalize).map(|s| subtract_all(vec![s], &incoming)),
+        },
+        RGN_XOR => {
+            let base = current?;
+            let mut out = subtract_all(base.clone(), &incoming);
+            let rest = subtract_all(incoming, &base);
+            for r in rest {
+                if out.len() >= MAX_CLIP_RECTS {
+                    break;
+                }
+                out.push(r);
+            }
+            Some(out)
+        }
+        _ => current,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn intersect_shrinks_to_the_overlap() {
+        let r = intersect(None, [0.0, 0.0, 100.0, 50.0]);
+        let r = intersect(r, [40.0, 10.0, 80.0, 40.0]);
+        assert_eq!(r, Some(vec![[40.0, 10.0, 80.0, 40.0]]));
+        assert_eq!(intersect(r, [0.0, 0.0, 10.0, 10.0]), Some(vec![]));
+        assert_eq!(intersect(Some(vec![[0.0, 0.0, 10.0, 20.0]]), [40.0, 0.0, 80.0, 20.0]), Some(vec![]));
+    }
+
+    #[test]
+    fn modes_copy_and_or_diff_and_xor() {
+        let a = Some(vec![[0.0, 0.0, 100.0, 40.0]]);
+        assert_eq!(combine(a.clone(), vec![[10.0, 10.0, 30.0, 20.0]], RGN_COPY, None), Some(vec![[10.0, 10.0, 30.0, 20.0]]));
+        let and = combine(a.clone(), vec![[50.0, 0.0, 150.0, 40.0]], RGN_AND, None);
+        assert_eq!(and, Some(vec![[50.0, 0.0, 100.0, 40.0]]));
+        let or = combine(a.clone(), vec![[200.0, 0.0, 210.0, 10.0]], RGN_OR, None).unwrap();
+        assert_eq!(or.len(), 2);
+        let diff = combine(a.clone(), vec![[20.0, 0.0, 40.0, 40.0]], RGN_DIFF, None).unwrap();
+        assert_eq!(diff, vec![[0.0, 0.0, 20.0, 40.0], [40.0, 0.0, 100.0, 40.0]]);
+        let xor = combine(a, vec![[80.0, 0.0, 120.0, 40.0]], RGN_XOR, None).unwrap();
+        assert!(xor.contains(&[0.0, 0.0, 80.0, 40.0]));
+        assert!(xor.contains(&[100.0, 0.0, 120.0, 40.0]));
+    }
+
+    #[test]
+    fn excluding_from_the_default_clip_uses_the_surface() {
+        let r = exclude(None, [10.0, 0.0, 20.0, 40.0], Some([0.0, 0.0, 40.0, 40.0])).unwrap();
+        assert_eq!(r, vec![[0.0, 0.0, 10.0, 40.0], [20.0, 0.0, 40.0, 40.0]]);
+        assert_eq!(exclude(None, [10.0, 0.0, 20.0, 40.0], None), None);
+    }
+
+    #[test]
+    fn a_zero_area_rectangle_clears_an_intersection() {
+        assert_eq!(intersect(Some(vec![[0.0, 0.0, 10.0, 10.0]]), [5.0, 5.0, 5.0, 8.0]), Some(vec![]));
+    }
+}
diff --git a/crates/metafile/src/emf.rs b/crates/metafile/src/emf.rs
index 709537f7..09b20922 100644
--- a/crates/metafile/src/emf.rs
+++ b/crates/metafile/src/emf.rs
@@ -39,6 +39,9 @@ pub(crate) fn parse(input: Bytes) -> Result<(Canvas, Option<Frame>), Error> {
     let [l, t, r, b] = bounds;
     let frame = frame_from_header(input).or_else(|| (r > l && b > t).then_some(Frame { rect: [l, t, r - l, b - t], size: None }));
     let mut cv = Canvas::new();
+    if r > l && b > t {
+        cv.set_clip_surface([l, t, r, b]);
+    }
     if let Some(px_mm) = device_px_per_mm(input) {
         cv.set_device_mm(px_mm);
     }
@@ -117,6 +120,9 @@ fn record(cv: &mut Canvas, typ: u32, r: Bytes) {
         83 | 84 => ext_text_out(cv, r, typ == 84),
         108 => small_text_out(cv, r),
         40 => r.u32(8).map(|i| cv.delete_object(i)),
+        29 => rect32(r, 8).map(|rect| cv.exclude_clip_rect(rect)),
+        30 => rect32(r, 8).map(|rect| cv.intersect_clip_rect(rect)),
+        75 => ext_select_clip(cv, r),
         27 => xy32(r, 8).map(|p| cv.move_to(p)),
         54 => xy32(r, 8).map(|p| cv.line_to(p)),
         42 => rect32(r, 8).map(|[l, t, rr, b]| cv.shape(&geom::ellipse(l, t, rr, b), true, true)),
@@ -182,6 +188,37 @@ fn record(cv: &mut Canvas, typ: u32, r: Bytes) {
     };
 }
 
+/// EMR_EXTSELECTCLIPRGN: `cbRgnData` bytes of `RGNDATA` (rectangles in logical units) and a region
+/// mode. No region data selects the default clip.
+fn ext_select_clip(cv: &mut Canvas, r: Bytes) -> Option<()> {
+    let cb = r.u32(8)? as usize;
+    let mode = r.u32(12)?;
+    if cb == 0 {
+        cv.reset_clip();
+        return Some(());
+    }
+    let header = 16;
+    if cb < 32 {
+        return Some(());
+    }
+    // RDH_RECTANGLES is the only region type GDI writes.
+    if r.u32(header + 4)? != 1 {
+        return Some(());
+    }
+    let n = (r.u32(header + 8)? as usize).min(crate::clip::MAX_CLIP_RECTS);
+    let end = header.checked_add(cb)?;
+    let mut rects = Vec::new();
+    for i in 0..n {
+        let o = header + 32 + i * 16;
+        if o + 16 > end {
+            break;
+        }
+        rects.push(rect32(r, o)?);
+    }
+    cv.select_clip_rects(&rects, mode);
+    Some(())
+}
+
 /// Two little-endian i32 values at `off`, as a point.
 fn xy32(r: Bytes, off: usize) -> Option<P> {
     Some((f64::from(r.i32(off)?), f64::from(r.i32(off + 4)?)))
diff --git a/crates/metafile/src/lib.rs b/crates/metafile/src/lib.rs
index d7d98501..a658f43c 100644
--- a/crates/metafile/src/lib.rs
+++ b/crates/metafile/src/lib.rs
@@ -9,12 +9,15 @@
 //! bounds-checked and every count is capped; hostile input yields a shorter picture or an [`Error`],
 //! never a panic.
 //!
-//! Records follow MS-WMF and MS-EMF. Records outside the supported set are skipped silently.
+//! Records follow MS-WMF and MS-EMF. Rectangle clip regions (`INTERSECTCLIPRECT`,
+//! `EXCLUDECLIPRECT`, `EXTSELECTCLIPRGN`) limit what later records draw. Records outside the
+//! supported set are skipped silently.
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
 
 mod bytes;
 mod canvas;
+mod clip;
 mod dib;
 mod emf;
 mod geom;
@@ -66,12 +69,27 @@ pub enum Item {
         /// Colour and width in picture units.
         stroke: Option<([u8; 4], f32)>,
         even_odd: bool,
+        /// Clip region in picture units, each rectangle `[x0, y0, x1, y1]`. None is the default clip.
+        region: Option<Vec<[f32; 4]>>,
     },
     /// A bitmap stretched into `rect` = `[x, y, w, h]` (picture units), RGBA8 rows top-down.
-    Bitmap { rect: [f32; 4], width: u32, height: u32, rgba: Vec<u8> },
+    Bitmap {
+        rect: [f32; 4],
+        width: u32,
+        height: u32,
+        rgba: Vec<u8>,
+        /// Clip region in picture units. None is the default clip.
+        region: Option<Vec<[f32; 4]>>,
+    },
     /// A path filled with a repeating tile (pattern and hatch brushes). Items filled with the same
     /// brush share its tile.
-    Pattern { segs: Vec<Seg>, even_odd: bool, tile: Arc<Tile> },
+    Pattern {
+        segs: Vec<Seg>,
+        even_odd: bool,
+        tile: Arc<Tile>,
+        /// Clip region in picture units. None is the default clip.
+        region: Option<Vec<[f32; 4]>>,
+    },
     /// A text string.
     Text(Box<Text>),
 }
@@ -153,20 +171,20 @@ fn build(raw: Vec<Raw>, frame: Option<Frame>) -> Picture {
     // Tiles shared by several fills stay shared.
     let mut tiles: HashMap<*const canvas::RawTile, (Arc<canvas::RawTile>, Arc<Tile>)> = HashMap::new();
     let items = raw.into_iter().filter_map(|r| match r {
-        Raw::Path { ops, fill, stroke, even_odd } => {
+        Raw::Path { ops, fill, stroke, even_odd, region } => {
             let segs = ops.iter().map(|op| seg(op, tf)).collect::<Option<Vec<Seg>>>()?;
             if segs.len() < 2 {
                 return None;
             }
             let stroke = stroke.and_then(|(c, w)| Some((c, f((w * stroke_scale).min(diag))?)));
-            Some(Item::Path { segs, fill, stroke, even_odd })
+            Some(Item::Path { segs, fill, stroke, even_odd, region: map_region(region, &tf)? })
         }
-        Raw::Bitmap { rect: r, img } => {
+        Raw::Bitmap { rect: r, img, region } => {
             let (x, y) = tf((r[0], r[1]));
             let rect = [f(x)?, f(y)?, f(r[2] * sx)?, f(r[3] * sy)?];
-            Some(Item::Bitmap { rect, width: img.w as u32, height: img.h as u32, rgba: img.px })
+            Some(Item::Bitmap { rect, width: img.w as u32, height: img.h as u32, rgba: img.px, region: map_region(region, &tf)? })
         }
-        Raw::Pattern { ops, even_odd, tile } => {
+        Raw::Pattern { ops, even_odd, tile, region } => {
             let segs = ops.iter().map(|op| seg(op, tf)).collect::<Option<Vec<Seg>>>()?;
             if segs.len() < 2 {
                 return None;
@@ -188,27 +206,38 @@ fn build(raw: Vec<Raw>, frame: Option<Frame>) -> Picture {
                     t
                 }
             };
-            Some(Item::Pattern { segs, even_odd, tile })
+            Some(Item::Pattern { segs, even_odd, tile, region: map_region(region, &tf)? })
         }
-        Raw::Text(mut t) => {
+        Raw::Text { mut text, region } => {
             // Device to picture: scale by (sx, sy) after moving the frame's corner to the origin.
-            let [a, b, c, d, e, g] = t.transform;
+            let [a, b, c, d, e, g] = text.transform;
             let (e, g) = tf((e, g));
-            t.transform = [a * sx, b * sy, c * sx, d * sy, e, g];
-            if !t.transform.iter().all(|v| v.is_finite()) {
+            text.transform = [a * sx, b * sy, c * sx, d * sy, e, g];
+            if !text.transform.iter().all(|v| v.is_finite()) {
                 return None;
             }
-            if let Some([x0, y0, x1, y1]) = t.clip {
+            if let Some([x0, y0, x1, y1]) = text.clip {
                 let (p, q) = (tf((f64::from(x0), f64::from(y0))), tf((f64::from(x1), f64::from(y1))));
-                t.clip = Some([f(p.0.min(q.0))?, f(p.1.min(q.1))?, f(p.0.max(q.0))?, f(p.1.max(q.1))?]);
+                text.clip = Some([f(p.0.min(q.0))?, f(p.1.min(q.1))?, f(p.0.max(q.0))?, f(p.1.max(q.1))?]);
             }
-            Some(Item::Text(t))
+            text.region = map_region(region, &tf)?;
+            Some(Item::Text(text))
         }
     });
     let items = items.collect();
     Picture { width: f(size.0).unwrap_or(0.0), height: f(size.1).unwrap_or(0.0), items }
 }
 
+fn map_region(region: Option<Vec<[f64; 4]>>, tf: &impl Fn(P) -> P) -> Option<Option<Vec<[f32; 4]>>> {
+    let Some(rects) = region else { return Some(None) };
+    let mut out = Vec::with_capacity(rects.len());
+    for [x0, y0, x1, y1] in rects {
+        let (p, q) = (tf((x0, y0)), tf((x1, y1)));
+        out.push([f(p.0.min(q.0))?, f(p.1.min(q.1))?, f(p.0.max(q.0))?, f(p.1.max(q.1))?]);
+    }
+    Some(Some(out))
+}
+
 fn f(v: f64) -> Option<f32> {
     let v = v as f32;
     v.is_finite().then_some(v)
@@ -268,7 +297,7 @@ fn bbox(raw: &[Raw]) -> Option<[f64; 4]> {
                 grow((rect[0], rect[1]));
                 grow((rect[0] + rect[2], rect[1] + rect[3]));
             }
-            Raw::Text(t) => grow((t.transform[4], t.transform[5])),
+            Raw::Text { text: t, .. } => grow((t.transform[4], t.transform[5])),
         }
     }
     b
diff --git a/crates/metafile/src/place.rs b/crates/metafile/src/place.rs
index 28e0b6ae..d9d3bdf8 100644
--- a/crates/metafile/src/place.rs
+++ b/crates/metafile/src/place.rs
@@ -16,15 +16,15 @@ const MIN_BITMAP_SIDE: f64 = 1e-6;
 pub enum PlacedItem {
     /// A filled and/or stroked path. The stroke width is in target units; 0 is a cosmetic hairline that
     /// the renderer draws at its minimum width.
-    Path { path: BezPath, fill: Option<[u8; 4]>, stroke: Option<([u8; 4], f64)>, even_odd: bool },
+    Path { path: BezPath, fill: Option<[u8; 4]>, stroke: Option<([u8; 4], f64)>, even_odd: bool, region: Option<BezPath> },
     /// `Picture::items[index]`, a bitmap, stretched into `rect`.
-    Bitmap { index: usize, rect: Rect },
+    Bitmap { index: usize, rect: Rect, region: Option<BezPath> },
     /// `Picture::items[index]`, a pattern fill: `path` (target units) filled with the item's tile
     /// repeated; `tile` maps tile pixels to target units.
-    Pattern { index: usize, path: BezPath, even_odd: bool, tile: Affine },
+    Pattern { index: usize, path: BezPath, even_odd: bool, tile: Affine, region: Option<BezPath> },
     /// `Picture::items[index]`, a text string: `transform` maps its text space to target units;
-    /// `clip` (target units) bounds what it draws.
-    Text { index: usize, transform: Affine, clip: Option<Rect> },
+    /// `clip` (target units) bounds what it draws. `region` is the device-context clip.
+    Text { index: usize, transform: Affine, clip: Option<Rect>, region: Option<BezPath> },
 }
 
 impl Picture {
@@ -55,38 +55,42 @@ impl Picture {
         let mut out = Vec::with_capacity(self.items.len());
         for (index, item) in self.items.iter().enumerate() {
             match item {
-                Item::Path { segs, fill, stroke, even_odd } => {
+                Item::Path { segs, fill, stroke, even_odd, region } => {
                     let path = tf * bez(segs);
+                    let Some(region) = placed_region(&tf, region) else { continue };
                     if in_range(path.bounding_box()) {
                         let stroke = stroke.map(|(c, w)| (c, f64::from(w) * k));
-                        out.push(PlacedItem::Path { path, fill: *fill, stroke, even_odd: *even_odd });
+                        out.push(PlacedItem::Path { path, fill: *fill, stroke, even_odd: *even_odd, region });
                     }
                 }
-                Item::Pattern { segs, even_odd, tile: t } => {
+                Item::Pattern { segs, even_odd, tile: t, region } => {
                     let path = tf * bez(segs);
+                    let Some(region) = placed_region(&tf, region) else { continue };
                     let tile = tf
                         * Affine::translate((f64::from(t.origin[0]), f64::from(t.origin[1])))
                         * Affine::scale_non_uniform(f64::from(t.cell[0]), f64::from(t.cell[1]));
                     let det = tile.determinant();
                     if in_range(path.bounding_box()) && det.is_finite() && det.abs() > 1e-12 {
-                        out.push(PlacedItem::Pattern { index, path, even_odd: *even_odd, tile });
+                        out.push(PlacedItem::Pattern { index, path, even_odd: *even_odd, tile, region });
                     }
                 }
                 Item::Text(t) => {
                     let transform = tf * Affine::new(t.transform);
+                    let Some(region) = placed_region(&tf, &t.region) else { continue };
                     let clip =
                         t.clip.map(|[x0, y0, x1, y1]| tf.transform_rect_bbox(Rect::new(f64::from(x0), f64::from(y0), f64::from(x1), f64::from(y1))));
                     let c = transform.as_coeffs();
                     let origin = Rect::new(c[4], c[5], c[4], c[5]);
                     if in_range(origin) && c.iter().all(|v| v.is_finite()) && clip.is_none_or(in_range) {
-                        out.push(PlacedItem::Text { index, transform, clip });
+                        out.push(PlacedItem::Text { index, transform, clip, region });
                     }
                 }
-                Item::Bitmap { rect: [x, y, w, h], .. } => {
+                Item::Bitmap { rect: [x, y, w, h], region, .. } => {
                     let (x0, y0) = (f64::from(*x), f64::from(*y));
                     let rect = tf.transform_rect_bbox(Rect::new(x0, y0, x0 + f64::from(*w), y0 + f64::from(*h)));
+                    let Some(region) = placed_region(&tf, region) else { continue };
                     if in_range(rect) && rect.width() > MIN_BITMAP_SIDE && rect.height() > MIN_BITMAP_SIDE {
-                        out.push(PlacedItem::Bitmap { index, rect });
+                        out.push(PlacedItem::Bitmap { index, rect, region });
                     }
                 }
             }
@@ -107,6 +111,20 @@ impl Item {
     }
 }
 
+/// The device-context clip in target units. `Some(None)` is the default clip. `None` means the
+/// region does not meet the page, so the item draws nothing.
+fn placed_region(tf: &Affine, region: &Option<Vec<[f32; 4]>>) -> Option<Option<BezPath>> {
+    let Some(rects) = region else { return Some(None) };
+    let mut path = BezPath::new();
+    for [x0, y0, x1, y1] in rects {
+        let r = tf.transform_rect_bbox(Rect::new(f64::from(*x0), f64::from(*y0), f64::from(*x1), f64::from(*y1)));
+        if in_range(r) && r.width() > 1e-9 && r.height() > 1e-9 {
+            path.extend(r.to_path(0.1));
+        }
+    }
+    (!path.is_empty()).then_some(Some(path))
+}
+
 /// Segments as a kurbo path. A segment after a close opens a new subpath at the last start point.
 fn bez(segs: &[Seg]) -> BezPath {
     let mut p = BezPath::new();
diff --git a/crates/metafile/src/tests.rs b/crates/metafile/src/tests.rs
index 271cc83b..e0e3a446 100644
--- a/crates/metafile/src/tests.rs
+++ b/crates/metafile/src/tests.rs
@@ -119,7 +119,7 @@ const DIB24_RGBA: [u8; 16] = [255, 0, 0, 255, 255, 255, 255, 255, 0, 0, 255, 255
 
 fn path_segs(item: &Item) -> (&Vec<Seg>, Option<[u8; 4]>, Option<([u8; 4], f32)>, bool) {
     match item {
-        Item::Path { segs, fill, stroke, even_odd } => (segs, *fill, *stroke, *even_odd),
+        Item::Path { segs, fill, stroke, even_odd, .. } => (segs, *fill, *stroke, *even_odd),
         other => panic!("expected a path: {other:?}"),
     }
 }
@@ -179,7 +179,7 @@ fn wmf_stretchdib_flips_bottom_up_rows() {
     let params = cat(vec![h32(0x00CC_0020), h16(0), h16(2), h16(2), h16(0), h16(0), h16(10), h16(20), h16(0), h16(0), dib24_bottom_up()]);
     let p = parse(&wmf(&[wrec(0x0F43, &params)], None)).unwrap();
     assert_eq!((p.width, p.height), (20.0, 10.0));
-    let Item::Bitmap { rect, width, height, rgba } = &p.items[0] else { panic!("expected a bitmap") };
+    let Item::Bitmap { rect, width, height, rgba, .. } = &p.items[0] else { panic!("expected a bitmap") };
     assert_eq!(rect, &[0.0, 0.0, 20.0, 10.0]);
     assert_eq!((*width, *height), (2, 2));
     assert_eq!(rgba.as_slice(), DIB24_RGBA);
@@ -236,7 +236,7 @@ fn emf_stretchdibits_flips_and_fits_frame() {
     let p = parse(&file).unwrap();
     let (w, h) = (2500.0 * 72.0 / 2540.0, 1250.0 * 72.0 / 2540.0);
     assert!(close(p.width, w as f32) && close(p.height, h as f32));
-    let Item::Bitmap { rect, width, height, rgba } = &p.items[0] else { panic!("expected a bitmap") };
+    let Item::Bitmap { rect, width, height, rgba, .. } = &p.items[0] else { panic!("expected a bitmap") };
     assert!(rect.iter().zip([0.0, 0.0, w, h]).all(|(a, b)| close(*a, b as f32)));
     assert_eq!((*width, *height), (2, 2));
     assert_eq!(rgba.as_slice(), DIB24_RGBA);
@@ -428,7 +428,7 @@ fn wmf_stretchdib_clipped_source_keeps_its_place() {
     // destination and the picture keeps the original 20-unit width scale.
     let params = cat(vec![h32(0x00CC_0020), h16(0), h16(2), h16(2), h16(0), h16(-1), h16(10), h16(20), h16(0), h16(0), dib24_bottom_up()]);
     let p = parse(&wmf(&[wrec(0x0F43, &params)], Some([0, 0, 20, 10]))).unwrap();
-    let Item::Bitmap { rect, width, height, rgba } = &p.items[0] else { panic!("expected a bitmap") };
+    let Item::Bitmap { rect, width, height, rgba, .. } = &p.items[0] else { panic!("expected a bitmap") };
     // Placeable units are points: 20 units at 1440 per inch are 1 point, so the right column is 0.5 pt wide.
     assert_eq!(rect, &[0.5, 0.0, 0.5, 0.5]);
     assert_eq!((*width, *height), (1, 2));
@@ -723,7 +723,7 @@ fn wmf_dibbitblt_copies_the_dib_at_its_destination() {
     params.extend(dib24_bottom_up());
     let recs = [wrec(0x041B, &cat(vec![h16(10), h16(10), h16(0), h16(0)])), wrec(0x0940, &params)];
     let p = parse(&wmf(&recs, None)).unwrap();
-    let Item::Bitmap { rect, width, height, rgba } = &p.items[1] else { panic!("expected a bitmap") };
+    let Item::Bitmap { rect, width, height, rgba, .. } = &p.items[1] else { panic!("expected a bitmap") };
     assert_eq!(rect, &[5.0, 6.0, 2.0, 2.0]);
     assert_eq!((*width, *height), (2, 2));
     assert_eq!(rgba.as_slice(), DIB24_RGBA);
@@ -881,8 +881,14 @@ fn place_fits_the_frame_scales_strokes_and_drops_far_paths() {
         width: 100.0,
         height: 50.0,
         items: vec![
-            Item::Path { segs: vec![Seg::Move(0.0, 0.0), Seg::Line(10.0, 10.0)], fill: None, stroke: Some(([0, 0, 0, 255], 4.0)), even_odd: true },
-            Item::Path { segs: vec![Seg::Move(0.0, 0.0), Seg::Line(2e6, 0.0)], fill: None, stroke: None, even_odd: true },
+            Item::Path {
+                segs: vec![Seg::Move(0.0, 0.0), Seg::Line(10.0, 10.0)],
+                fill: None,
+                stroke: Some(([0, 0, 0, 255], 4.0)),
+                even_odd: true,
+                region: None,
+            },
+            Item::Path { segs: vec![Seg::Move(0.0, 0.0), Seg::Line(2e6, 0.0)], fill: None, stroke: None, even_odd: true, region: None },
         ],
     };
     let placed = pic.place(kurbo::Rect::new(0.0, 0.0, 200.0, 100.0), [0.0; 4]);
@@ -893,7 +899,7 @@ fn place_fits_the_frame_scales_strokes_and_drops_far_paths() {
 
 #[test]
 fn place_keeps_only_finite_bounded_bitmaps_with_area() {
-    let bitmap = |rect: [f32; 4]| Item::Bitmap { rect, width: 1, height: 1, rgba: vec![0; 4] };
+    let bitmap = |rect: [f32; 4]| Item::Bitmap { rect, width: 1, height: 1, rgba: vec![0; 4], region: None };
     let pic = crate::Picture {
         width: 100.0,
         height: 50.0,
@@ -907,21 +913,21 @@ fn place_keeps_only_finite_bounded_bitmaps_with_area() {
     };
     let placed = pic.place(kurbo::Rect::new(0.0, 0.0, 200.0, 100.0), [0.0; 4]);
     assert_eq!(placed.len(), 1);
-    let crate::PlacedItem::Bitmap { index, rect } = &placed[0] else { panic!("expected a bitmap") };
+    let crate::PlacedItem::Bitmap { index, rect, .. } = &placed[0] else { panic!("expected a bitmap") };
     assert_eq!((*index, *rect), (4, kurbo::Rect::new(20.0, 10.0, 40.0, 30.0)));
 }
 
 #[test]
 fn take_pixels_returns_only_drawable_bitmaps() {
-    let mut ok = Item::Bitmap { rect: [0.0; 4], width: 2, height: 1, rgba: vec![7; 8] };
+    let mut ok = Item::Bitmap { rect: [0.0; 4], width: 2, height: 1, rgba: vec![7; 8], region: None };
     assert_eq!(ok.take_pixels(), Some((2, 1, vec![7; 8])));
     assert!(matches!(&ok, Item::Bitmap { rgba, .. } if rgba.is_empty()), "the pixels move out");
-    let mut short = Item::Bitmap { rect: [0.0; 4], width: 2, height: 2, rgba: vec![0; 8] };
+    let mut short = Item::Bitmap { rect: [0.0; 4], width: 2, height: 2, rgba: vec![0; 8], region: None };
     assert_eq!(short.take_pixels(), None);
     let side = crate::MAX_BITMAP_SIDE + 1;
-    let mut wide = Item::Bitmap { rect: [0.0; 4], width: side, height: 1, rgba: vec![0; side as usize * 4] };
+    let mut wide = Item::Bitmap { rect: [0.0; 4], width: side, height: 1, rgba: vec![0; side as usize * 4], region: None };
     assert_eq!(wide.take_pixels(), None);
-    let mut path = Item::Path { segs: Vec::new(), fill: None, stroke: None, even_odd: false };
+    let mut path = Item::Path { segs: Vec::new(), fill: None, stroke: None, even_odd: false, region: None };
     assert_eq!(path.take_pixels(), None);
     let pic = |width: f32, height: f32| crate::Picture { width, height, items: Vec::new() };
     assert!(pic(1.0, 2.0).has_size());
@@ -1518,3 +1524,81 @@ fn pattern_brush_pixels_count_against_the_byte_budget() {
     let p = wmf200(&recs);
     assert!(p.items.is_empty(), "the parse stopped at the budget: {:?}", p.items.len());
 }
+
+fn item_region(item: &Item) -> Option<&[[f32; 4]]> {
+    match item {
+        Item::Path { region, .. } | Item::Bitmap { region, .. } | Item::Pattern { region, .. } => region.as_deref(),
+        Item::Text(t) => t.region.as_deref(),
+    }
+}
+
+#[test]
+fn emf_intersect_clip_rect_limits_later_records_only() {
+    let full = cat(vec![e32(0), e32(0), e32(80), e32(40)]);
+    let clip = cat(vec![e32(10), e32(5), e32(40), e32(30)]);
+    let p = parse(&emf(&[erec(43, &full), erec(30, &clip), erec(43, &full)], [0, 0, 80, 40], [0; 4])).unwrap();
+    assert_eq!(p.items.len(), 2);
+    assert_eq!(item_region(&p.items[0]), None);
+    assert_eq!(item_region(&p.items[1]), Some(&[[10.0, 5.0, 40.0, 30.0]][..]));
+}
+
+#[test]
+fn emf_clip_follows_the_world_transform_and_save_restores_it() {
+    let xf = cat([2.0f32, 0.0, 0.0, 2.0, 0.0, 0.0].iter().map(|v| v.to_le_bytes().to_vec()).collect());
+    let rect = cat(vec![e32(0), e32(0), e32(10), e32(10)]);
+    let clip = cat(vec![e32(0), e32(0), e32(5), e32(5)]);
+    let p = parse(&emf(&[erec(35, &xf), erec(30, &clip), erec(43, &rect)], [0, 0, 20, 20], [0; 4])).unwrap();
+    assert_eq!(item_region(&p.items[0]), Some(&[[0.0, 0.0, 10.0, 10.0]][..]));
+
+    let full = cat(vec![e32(0), e32(0), e32(40), e32(20)]);
+    let p =
+        parse(&emf(&[erec(43, &full), erec(33, &[]), erec(30, &clip), erec(43, &full), erec(34, &e32(-1)), erec(43, &full)], [0, 0, 40, 20], [0; 4]))
+            .unwrap();
+    assert_eq!(p.items.len(), 3);
+    assert_eq!(item_region(&p.items[0]), None);
+    assert_eq!(item_region(&p.items[1]), Some(&[[0.0, 0.0, 5.0, 5.0]][..]));
+    assert_eq!(item_region(&p.items[2]), None);
+}
+
+#[test]
+fn emf_ext_select_clip_rgn_copies_and_intersects_rectangles() {
+    let mut data = cat(vec![h32(32), h32(1), h32(2), h32(32), e32(0), e32(0), e32(50), e32(20)]);
+    data.extend(cat(vec![e32(0), e32(0), e32(10), e32(20), e32(30), e32(0), e32(50), e32(20)]));
+    let payload = cat(vec![h32(data.len() as u32), h32(5), data]);
+    let rect = cat(vec![e32(0), e32(0), e32(50), e32(20)]);
+    let p = parse(&emf(&[erec(75, &payload), erec(43, &rect)], [0, 0, 50, 20], [0; 4])).unwrap();
+    assert_eq!(item_region(&p.items[0]), Some(&[[0.0, 0.0, 10.0, 20.0], [30.0, 0.0, 50.0, 20.0]][..]));
+
+    let and = cat(vec![h32(0), h32(1)]);
+    // A zero-length region selects the default clip, so the next rectangle is not clipped.
+    let p = parse(&emf(&[erec(75, &payload), erec(75, &and), erec(43, &rect)], [0, 0, 50, 20], [0; 4])).unwrap();
+    assert_eq!(item_region(&p.items[0]), None);
+
+    let overlap = cat(vec![e32(40), e32(0), e32(80), e32(20)]);
+    let p = parse(&emf(&[erec(75, &payload), erec(30, &overlap), erec(43, &rect)], [0, 0, 80, 20], [0; 4])).unwrap();
+    assert_eq!(item_region(&p.items[0]), Some(&[[40.0, 0.0, 50.0, 20.0]][..]));
+}
+
+#[test]
+fn emf_exclude_clip_rect_cuts_the_surface() {
+    let hole = cat(vec![e32(20), e32(0), e32(40), e32(40)]);
+    let rect = cat(vec![e32(0), e32(0), e32(80), e32(40)]);
+    let p = parse(&emf(&[erec(29, &hole), erec(43, &rect)], [0, 0, 80, 40], [0; 4])).unwrap();
+    assert_eq!(item_region(&p.items[0]), Some(&[[0.0, 0.0, 20.0, 40.0], [40.0, 0.0, 80.0, 40.0]][..]));
+}
+
+#[test]
+fn an_empty_clip_drops_later_drawing() {
+    let empty = cat(vec![e32(5), e32(5), e32(5), e32(8)]);
+    let rect = cat(vec![e32(0), e32(0), e32(20), e32(10)]);
+    let p = parse(&emf(&[erec(43, &rect), erec(30, &empty), erec(43, &rect)], [0, 0, 20, 10], [0; 4])).unwrap();
+    assert_eq!(p.items.len(), 1);
+}
+
+#[test]
+fn wmf_intersect_clip_rect_limits_later_records() {
+    let clip = cat(vec![h16(30), h16(40), h16(5), h16(10)]);
+    let rect = cat(vec![h16(40), h16(80), h16(0), h16(0)]);
+    let p = parse(&wmf(&[wrec(0x0416, &clip), wrec(0x041B, &rect)], None)).unwrap();
+    assert_eq!(item_region(&p.items[0]), Some(&[[10.0, 5.0, 40.0, 30.0]][..]));
+}
diff --git a/crates/metafile/src/text.rs b/crates/metafile/src/text.rs
index 86bca911..0125e9c5 100644
--- a/crates/metafile/src/text.rs
+++ b/crates/metafile/src/text.rs
@@ -63,6 +63,9 @@ pub struct Text {
     pub v_align: VAlign,
     /// Clip rectangle `[x0, y0, x1, y1]` in picture units (ETO_CLIPPED).
     pub clip: Option<[f32; 4]>,
+    /// Clip region from the device context, in picture units. None is the default clip. Drawn
+    /// together with [`Text::clip`] when both are set.
+    pub region: Option<Vec<[f32; 4]>>,
 }
 
 /// TA_UPDATECP: the string starts at the current position, which moves past it.
diff --git a/crates/metafile/src/wmf.rs b/crates/metafile/src/wmf.rs
index 12733e1c..3e02c10b 100644
--- a/crates/metafile/src/wmf.rs
+++ b/crates/metafile/src/wmf.rs
@@ -47,6 +47,7 @@ pub(crate) fn parse(input: Bytes) -> Result<(Canvas, Option<Frame>), Error> {
     let mut cv = Canvas::new();
     if let Some((c, size)) = bounds {
         cv.play_into(Some([c[0], c[1], c[2] - c[0], c[3] - c[1]]), size);
+        cv.set_clip_surface([0.0, 0.0, size.0, size.1]);
         cv.pattern_px = PT_PER_PX;
     }
     let mut player_viewport = bounds.is_some();
@@ -122,6 +123,8 @@ fn record(cv: &mut Canvas, func: u16, r: Bytes) {
                 cv.shape(&geom::round_rect(l, t, rr, b, f64::from(ew), f64::from(eh)), true, true);
             })
         }
+        0x0415 => rect16(r, 6).map(|rect| cv.exclude_clip_rect(rect)),
+        0x0416 => rect16(r, 6).map(|rect| cv.intersect_clip_rect(rect)),
         0x0418 => rect16(r, 6).map(|[l, t, rr, b]| cv.shape(&geom::ellipse(l, t, rr, b), true, true)),
         0x0817 | 0x081A | 0x0830 => arc16(r).map(|(bounds, s, e)| {
             let kind = match func {
diff --git a/crates/render/src/metafile.rs b/crates/render/src/metafile.rs
index 12350971..bb9da83f 100644
--- a/crates/render/src/metafile.rs
+++ b/crates/render/src/metafile.rs
@@ -51,7 +51,7 @@ pub fn rasterize(bytes: &[u8], side: u32) -> Option<image::RgbaImage> {
     ctx.push_clip_layer(&r.to_path(0.1));
     for it in pic.place(r, [0.0; 4]) {
         match it {
-            PlacedItem::Path { path, fill, stroke, even_odd } => {
+            PlacedItem::Path { path, fill, stroke, even_odd, region } => clipped(&mut ctx, region.as_ref(), |ctx| {
                 if let Some(f) = fill {
                     ctx.set_paint(rgba(f));
                     ctx.set_fill_rule(if even_odd { peniko::Fill::EvenOdd } else { peniko::Fill::NonZero });
@@ -63,9 +63,9 @@ pub fn rasterize(bytes: &[u8], side: u32) -> Option<image::RgbaImage> {
                     ctx.set_stroke(kurbo::Stroke::new(sw.max(1.0)).with_caps(kurbo::Cap::Round).with_join(kurbo::Join::Round));
                     ctx.stroke_path(&path);
                 }
-            }
-            PlacedItem::Bitmap { index, rect } => {
-                let Some(Some(pm)) = pixmaps.get(index) else { continue };
+            }),
+            PlacedItem::Bitmap { index, rect, region } => clipped(&mut ctx, region.as_ref(), |ctx| {
+                let Some(Some(pm)) = pixmaps.get(index) else { return };
                 let (bw, bh) = (pm.width().max(1) as f64, pm.height().max(1) as f64);
                 ctx.set_paint(vello_cpu::Image {
                     image: vello_cpu::ImageSource::Pixmap(pm.clone()),
@@ -74,9 +74,9 @@ pub fn rasterize(bytes: &[u8], side: u32) -> Option<image::RgbaImage> {
                 ctx.set_paint_transform(Affine::translate((rect.x0, rect.y0)) * Affine::scale_non_uniform(rect.width() / bw, rect.height() / bh));
                 ctx.fill_rect(&rect);
                 ctx.reset_paint_transform();
-            }
-            PlacedItem::Pattern { index, path, even_odd, tile } => {
-                let Some(Item::Pattern { tile: t, .. }) = pic.items.get(index) else { continue };
+            }),
+            PlacedItem::Pattern { index, path, even_odd, tile, region } => clipped(&mut ctx, region.as_ref(), |ctx| {
+                let Some(Item::Pattern { tile: t, .. }) = pic.items.get(index) else { return };
                 let key = Arc::as_ptr(t);
                 let (pm, avg) = tiles.entry(key).or_insert_with(|| (premul(t.width, t.height, &t.rgba), average(&t.rgba))).clone();
                 ctx.set_fill_rule(if even_odd { peniko::Fill::EvenOdd } else { peniko::Fill::NonZero });
@@ -101,17 +101,17 @@ pub fn rasterize(bytes: &[u8], side: u32) -> Option<image::RgbaImage> {
                         ctx.fill_path(&path);
                     }
                 }
-            }
-            PlacedItem::Text { index, transform, clip } => {
-                let Some(Item::Text(t)) = pic.items.get(index) else { continue };
+            }),
+            PlacedItem::Text { index, transform, clip, region } => clipped(&mut ctx, region.as_ref(), |ctx| {
+                let Some(Item::Text(t)) = pic.items.get(index) else { return };
                 if let Some(c) = clip {
                     ctx.push_clip_layer(&c.to_path(0.1));
                 }
-                draw_text(&mut ctx, t, transform);
+                draw_text(ctx, t, transform);
                 if clip.is_some() {
                     ctx.pop_layer();
                 }
-            }
+            }),
         }
     }
     ctx.set_fill_rule(peniko::Fill::NonZero);
@@ -133,6 +133,17 @@ pub fn rasterize(bytes: &[u8], side: u32) -> Option<image::RgbaImage> {
     image::RgbaImage::from_raw(w as u32, h as u32, px)
 }
 
+/// Draws `draw` inside the device-context clip. No region is the default clip.
+fn clipped(ctx: &mut RenderContext, region: Option<&BezPath>, draw: impl FnOnce(&mut RenderContext)) {
+    if let Some(region) = region {
+        ctx.push_clip_layer(region);
+        draw(ctx);
+        ctx.pop_layer();
+    } else {
+        draw(ctx);
+    }
+}
+
 /// One glyph placed in text space (x along the baseline from the string's start, font units at
 /// `scale` text units each).
 struct Glyph {
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..541491fa 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1711,3 +1711,33 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
     let (w, h) = ink(deckcraft_model::text::TextDir::Vertical);
     assert!(h > w * 3, "vert: stroke on its side {w}x{h}");
 }
+
+#[test]
+fn metafile_intersect_clip_rect_hides_the_rest_of_the_picture() {
+    let rec = |typ: u32, payload: &[u8]| {
+        let mut v = typ.to_le_bytes().to_vec();
+        v.extend(((8 + payload.len()) as u32).to_le_bytes());
+        v.extend(payload);
+        v
+    };
+    let rect = |l: i32, t: i32, r: i32, b: i32| [l, t, r, b].into_iter().flat_map(|v| v.to_le_bytes()).collect::<Vec<_>>();
+    let mut body = rec(30, &rect(0, 0, 50, 50));
+    body.extend(rec(43, &rect(0, 0, 100, 50)));
+    let eof = rec(14, &[0; 12]);
+    let total = 88 + body.len() + eof.len();
+    let mut file = vec![0u8; 88];
+    file[0..4].copy_from_slice(&1u32.to_le_bytes());
+    file[4..8].copy_from_slice(&88u32.to_le_bytes());
+    file[8..24].copy_from_slice(&rect(0, 0, 100, 50));
+    file[40..44].copy_from_slice(&0x464D_4520u32.to_le_bytes());
+    file[44..48].copy_from_slice(&0x0001_0000u32.to_le_bytes());
+    file[48..52].copy_from_slice(&(total as u32).to_le_bytes());
+    file[52..56].copy_from_slice(&2u32.to_le_bytes());
+    file[56..58].copy_from_slice(&1u16.to_le_bytes());
+    file.extend(body);
+    file.extend(eof);
+    let img = crate::metafile::rasterize(&file, 100).expect("raster");
+    let opaque = |x: u32, y: u32| img.get_pixel(x, y)[3] > 200;
+    assert!(opaque(20, 25), "the clipped half is drawn");
+    assert!(!opaque(80, 25), "past the clip the picture stays clear, pixel {:?}", img.get_pixel(80, 25));
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..efbd7f63 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (EMF/WMF rectangle clip regions; previous: trivial, groups with a small legacy child space, #233) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -38,7 +38,7 @@ PowerPoint opens and saves; Viewer = opens only).
 |---|---|---|---|
 | PNG, JPEG, GIF (animated), BMP, TIFF, WebP | yes | yes | `image` 0.25; animated GIFs play since #39 |
 | SVG | yes (with PNG fallback) | **no** | The PNG fallback shows; SVG files can't be inserted |
-| EMF / WMF | yes | partial | Drawn as vectors (paths, pens, pattern and hatch brushes, bitmaps, text in the document's fonts with the file's character advances); clip regions and EMF+ records are not drawn. Legacy OLE objects (VML preview) and ActiveX controls show their pictures |
+| EMF / WMF | yes | partial | Drawn as vectors (paths, pens, pattern and hatch brushes, bitmaps, text in the document's fonts with the file's character advances). Rectangle clip regions (`INTERSECTCLIPRECT`, `EXCLUDECLIPRECT`, `EXTSELECTCLIPRGN`) limit later drawing; EMF+ records are not drawn. Legacy OLE objects (VML preview) and ActiveX controls show their pictures |
 | HEIC | yes (macOS) | no | |
 | Audio: MP3, AAC/M4A, ALAC, WAV, AIFF, CAF, FLAC, Ogg Vorbis, Opus | yes (Ogg/Opus partly) | yes | Pure-Rust decoders in `crates/media`, `crates/opus` |
 | WMA | yes (Windows) | embedded, not playable | |
@@ -93,12 +93,13 @@ the round trip even though DeckCraft doesn't model it.
    embedded fonts, every transition and animation) in a corpus repo, with import → render → export
    → re-import checks in CI and a PowerPoint reference render for each (owner runs PowerPoint).
 2. The round-trip losses above (#70, #74, #77).
-3. SVG rendering, and clip regions inside EMF/WMF.
+3. SVG rendering. EMF+ records inside EMF/WMF are still not drawn.
 
 ## Revision history
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | EMF/WMF rectangle clip regions limit later drawing; EMF+ records remain |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..795436b8 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (EMF/WMF rectangle clip regions; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -20,7 +20,7 @@ revision history.
 | 1 | PPTX never tested against a corpus of real decks | File format | B | 20–35 | [file-format-parity.md](file-format-parity.md) |
 | 2 | Data loss and crashes on common paths (#60, #40, #59) | Stability | B | 6–12 | this file |
 | 3 | PPTX round trip drops comment threads, media options, rewind (#70, #74, #77) | File format | B | 3–6 | [file-format-parity.md](file-format-parity.md) |
-| 4 | SVG pictures don't render (EMF/WMF do) | File format | B | 6–12 | [file-format-parity.md](file-format-parity.md) |
+| 4 | SVG pictures don't render (EMF/WMF do) | File format | B | 4–8 | [file-format-parity.md](file-format-parity.md) |
 | 5 | No localization: English only | Localization | B (infra + 5 languages) | 55–90 | [localization-parity.md](localization-parity.md) |
 | 6 | No printing | Feature | B | 5–8 | [file-format-parity.md](file-format-parity.md) |
 | 7 | Fonts: only Regular, Bold and Italic faces (#69) | Feature | B | 3–5 | [ui-parity.md](ui-parity.md) |
@@ -78,11 +78,11 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### SVG pictures don't render
 - **Evidence:** `crates/render/src/images.rs` decodes through `image` 0.25 (PNG, JPEG, WebP, GIF,
   TIFF, BMP), and EMF/WMF through `deckcraft-metafile` (ported from WordCraft: paths, fills, pens,
-  pattern and hatch brushes, bitmaps and text; clip regions and EMF+ records are not drawn).
+  pattern and hatch brushes, bitmaps and text; rectangle clip regions are applied, EMF+ records are
+  not drawn).
   Nothing reads SVG; PowerPoint's Insert Icons stores SVG with a PNG fallback.
-- **Impact:** SVG icons show only their raster fallback, and SVG files can't be inserted. An
-  EMF/WMF that clips its drawing (EXTSELECTCLIPRGN, INTERSECTCLIPRECT) draws past its clip.
-- **Estimate:** 4–8 h (an SVG renderer through `resvg`-style crates); EMF/WMF clip regions 2–4 h.
+- **Impact:** SVG icons show only their raster fallback, and SVG files can't be inserted.
+- **Estimate:** 4–8 h (an SVG renderer through `resvg`-style crates).
 
 ### Template, slide-show and macro variants are saved as plain `.pptx`
 - **Evidence:** `crates/pptx/src/write/mod.rs` always writes the
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | EMF/WMF rectangle clip regions (`INTERSECTCLIPRECT`, `EXCLUDECLIPRECT`, `EXTSELECTCLIPRGN`) limit later drawing. EMF+ records remain |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |

From e70fce996bd26caa31e0c4d0d64bc1c4ed6bf87b Mon Sep 17 00:00:00 2001
From: Sazid Al Bayazid <race-relish-stick@duck.com>
Date: Tue, 13 Oct 2026 21:13:25 +0600
Subject: [PATCH 096/376] Model: an exhausted id space refuses growth instead
 of duplicating ids (#407)

alloc_id bumped next_id with saturating_add: a presentation whose
next_id reached u32::MAX (a hostile file can arrive that way;
fix_next_id imports it) handed out that same id to every new slide,
shape, layout and media - duplicate ids, ambiguous references, silent
corruption on every later insert.

alloc_id now returns Option<u32> via checked_add, and every caller
refuses: the engine's insert/duplicate/media/layout commands answer
with a clear error naming the command, paste and duplicate re-id
helpers propagate it, media addition is fallible, and a fresh slide is
Option. The pptx export's synthesized blank layout is guarded the same
way. Loading keeps such a deck viewable: repair re-ids duplicate
slides while it can, and a duplicate it cannot re-id stays as it is -
growth is refused, and only that duplicate keeps its ambiguous id.

Renumbering the loaded graph was rejected: it needs the
cross-document reference remapping that issue #406 tracks.

Tests: model exhaustion (alloc_id None, fresh media refused, a new
slide refused), engine (slide.new, shape.insert, slide.duplicate and
edit.duplicate all refuse; the document holds no duplicate ids),
format repair (an unre-id-able duplicate stays visible).
---
 ROADMAP.md                        |  1 +
 crates/engine/src/cmd/arrange.rs  |  2 +-
 crates/engine/src/cmd/design.rs   | 10 +++++-----
 crates/engine/src/cmd/edit.rs     | 31 ++++++++++++++++---------------
 crates/engine/src/cmd/insert.rs   | 31 +++++++++++++++++--------------
 crates/engine/src/cmd/media.rs    |  2 +-
 crates/engine/src/cmd/merge.rs    |  2 +-
 crates/engine/src/cmd/mod.rs      |  4 ++++
 crates/engine/src/cmd/shape.rs    |  4 ++--
 crates/engine/src/cmd/slide.rs    |  8 ++++----
 crates/engine/src/tests.rs        | 25 +++++++++++++++++++++++++
 crates/engine/src/tools.rs        |  4 ++--
 crates/format/src/lib.rs          | 26 +++++++++++++++++++++-----
 crates/model/src/defaults.rs      | 17 +++++++++++------
 crates/model/src/lib.rs           | 19 +++++++++++--------
 crates/model/src/tests.rs         | 20 ++++++++++++++++----
 crates/pdf/src/tests.rs           |  2 +-
 crates/pptx/src/write/mod.rs      |  7 +++++--
 crates/pptx/tests/fills.rs        | 16 ++++++++--------
 crates/pptx/tests/locks.rs        |  6 +++---
 crates/pptx/tests/roundtrip.rs    | 18 +++++++++---------
 crates/pptx/tests/table_styles.rs |  2 +-
 crates/render/src/tests.rs        | 12 ++++++------
 crates/render/src/tests_wild.rs   |  8 ++++----
 crates/text/src/tests.rs          |  2 +-
 25 files changed, 176 insertions(+), 103 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..40d5dc38 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | A presentation whose object ids are used up refuses to grow instead of handing out duplicate ids (#407) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/crates/engine/src/cmd/arrange.rs b/crates/engine/src/cmd/arrange.rs
index 0c91bbaa..025c2f41 100644
--- a/crates/engine/src/cmd/arrange.rs
+++ b/crates/engine/src/cmd/arrange.rs
@@ -177,7 +177,7 @@ fn group(s: &mut Session, p: &Value) -> Result<Value> {
         let xs: Vec<Xfrm> = members.iter().filter_map(|m| m.xfrm).collect();
         let b = union_bounds(&xs).ok_or_else(|| bad("arrange.group", "nothing to group"))?;
         let gx = Xfrm::new(b.x0, b.y0, b.width(), b.height());
-        let id = ShapeId(doc.alloc_id());
+        let id = ShapeId(doc.alloc_id().ok_or_else(|| bad("arrange.group", NO_ID_SPACE))?);
         let n = super::current_shapes(doc, sel).map(|v| v.len()).unwrap_or(0);
         let g = Shape {
             id,
diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..72c996f8 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -177,7 +177,7 @@ fn background(s: &mut Session, p: &Value) -> Result<Value> {
     } else if p.get("picture").is_some() {
         let (name, bytes) = super::insert::media_bytes(&with_param(p, "data", p.get("picture").cloned().unwrap_or_default()), "design.background")?;
         let ct = super::insert::content_type(&name, &bytes);
-        let media = s.edit(|doc, _| Ok(doc.add_media(&name, ct, bytes)))?;
+        let media = s.edit(|doc, _| doc.add_media(&name, ct, bytes).ok_or_else(|| bad("design.background", NO_ID_SPACE)))?;
         Some(Background::Fill { fill: Fill::Picture(deckcraft_model::style::PictureFill { media, ..Default::default() }) })
     } else {
         return Err(bad("design.background", "give `color`, `gradient`, `pattern`, `picture`, `style` or `reset`"));
@@ -325,7 +325,7 @@ fn header_footer(s: &mut Session, p: &Value) -> Result<Value> {
             };
             let mut new_ids = vec![];
             for _ in 0..3 {
-                new_ids.push(ShapeId(doc.alloc_id()));
+                new_ids.push(ShapeId(doc.alloc_id().ok_or_else(|| bad("design.headerFooter", NO_ID_SPACE))?));
             }
             let Some(sl) = doc.slides.get_mut(i) else { continue };
             let sl = Arc::make_mut(sl);
@@ -459,8 +459,8 @@ fn insert_layout(s: &mut Session, p: &Value) -> Result<Value> {
     let name = str_param(p, "name").unwrap_or("Custom Layout").to_string();
     s.edit(|doc, sel| {
         let mi = master_index(doc, sel);
-        let id = deckcraft_model::LayoutId(doc.alloc_id());
-        let tid = ShapeId(doc.alloc_id());
+        let id = deckcraft_model::LayoutId(doc.alloc_id().ok_or_else(|| bad("master.insertLayout", NO_ID_SPACE))?);
+        let tid = ShapeId(doc.alloc_id().ok_or_else(|| bad("master.insertLayout", NO_ID_SPACE))?);
         let size = doc.slide_size;
         let m = Arc::make_mut(doc.masters.get_mut(mi).ok_or_else(|| bad("master.insertLayout", "no master"))?);
         let title = m.shapes.iter().find(|x| x.ph_type() == Some(PhType::Title)).cloned().map(|mut t| {
@@ -552,7 +552,7 @@ fn insert_placeholder(s: &mut Session, p: &Value) -> Result<Value> {
         text: Some(TextBody::default()),
         ..Default::default()
     };
-    let id = super::insert::add_shape(s, shape, true)?;
+    let id = super::insert::add_shape(s, "master.insertPlaceholder", shape, true)?;
     Ok(json!({"id": id}))
 }
 
diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 30437b15..3154a2b3 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -126,33 +126,34 @@ fn cut(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 /// Give pasted shapes fresh ids (groups included) and map connector ends.
-pub(crate) fn reid(doc: &mut deckcraft_model::Presentation, shapes: &mut [Shape]) {
-    fn rec(doc: &mut deckcraft_model::Presentation, shapes: &mut [Shape], depth: usize) {
+pub(crate) fn reid(cmd: &str, doc: &mut deckcraft_model::Presentation, shapes: &mut [Shape]) -> Result<()> {
+    fn rec(cmd: &str, doc: &mut deckcraft_model::Presentation, shapes: &mut [Shape], depth: usize) -> Result<()> {
         if depth > 64 {
-            return;
+            return Ok(());
         }
         for s in shapes {
-            s.id = ShapeId(doc.alloc_id());
+            s.id = ShapeId(doc.alloc_id().ok_or_else(|| bad(cmd, NO_ID_SPACE))?);
             if let Some(ch) = s.children_mut() {
-                rec(doc, ch, depth + 1);
+                rec(cmd, doc, ch, depth + 1)?;
             }
         }
+        Ok(())
     }
-    rec(doc, shapes, 0);
+    rec(cmd, doc, shapes, 0)
 }
 
-fn bring_media(doc: &mut deckcraft_model::Presentation, media: &[deckcraft_model::MediaItem]) {
+fn bring_media(doc: &mut deckcraft_model::Presentation, media: &[deckcraft_model::MediaItem]) -> Result<()> {
     for m in media {
         if doc.media(m.id).is_none_or(|x| x.data != m.data) {
             if doc.media(m.id).is_none() {
                 doc.media.push(m.clone());
             } else {
                 // Id clash with different bytes: unusual (other deck); keep ours, add theirs as new.
-                let id = doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone());
-                let _ = id;
+                doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone()).ok_or_else(|| bad("edit.paste", NO_ID_SPACE))?;
             }
         }
     }
+    Ok(())
 }
 
 fn paste(s: &mut Session, p: &Value) -> Result<Value> {
@@ -174,12 +175,12 @@ fn paste(s: &mut Session, p: &Value) -> Result<Value> {
     if !clip.slides.is_empty() {
         let at = s.doc()?.selection.slide + 1;
         return s.edit(|doc, sel| {
-            bring_media(doc, &clip.media);
+            bring_media(doc, &clip.media)?;
             let mut new_ids = vec![];
             for (k, sl) in clip.slides.iter().enumerate() {
                 let mut sl = sl.clone();
-                sl.id = SlideId(doc.alloc_id());
-                reid(doc, &mut sl.shapes);
+                sl.id = SlideId(doc.alloc_id().ok_or_else(|| bad("edit.paste", NO_ID_SPACE))?);
+                reid("edit.paste", doc, &mut sl.shapes)?;
                 if doc.layout(sl.layout).is_none() {
                     sl.layout = doc.masters.first().and_then(|m| m.layouts.first()).map(|l| l.id).unwrap_or_default();
                 }
@@ -200,9 +201,9 @@ fn paste(s: &mut Session, p: &Value) -> Result<Value> {
         let same_slide = s.doc().ok().is_some_and(|d| clip.shapes.iter().any(|c| d.shape(c.id).is_some()));
         let off = if same_slide { off } else { 0.0 };
         return s.edit(|doc, sel| {
-            bring_media(doc, &clip.media);
+            bring_media(doc, &clip.media)?;
             let mut shapes = clip.shapes.clone();
-            reid(doc, &mut shapes);
+            reid("edit.paste", doc, &mut shapes)?;
             for sh in &mut shapes {
                 if let Some(x) = sh.xfrm.as_mut() {
                     x.x += off;
@@ -251,7 +252,7 @@ fn duplicate(s: &mut Session, p: &Value) -> Result<Value> {
         let list = super::current_shapes(doc, sel).cloned().unwrap_or_default();
         let mut copies: Vec<Shape> = list.iter().filter(|x| ids.contains(&x.id)).cloned().collect();
         let boxes: Vec<_> = copies.iter().map(|c| xfrm_of(doc, sel, c)).collect();
-        reid(doc, &mut copies);
+        reid("edit.duplicate", doc, &mut copies)?;
         for (c, b) in copies.iter_mut().zip(boxes) {
             let mut x = b;
             x.x += off;
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..1d49af74 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -104,9 +104,9 @@ fn default_rect(s: &Session, w: f64, h: f64) -> Xfrm {
     Xfrm::new((size.width - w) / 2.0, (size.height - h) / 2.0, w, h)
 }
 
-pub(crate) fn add_shape(s: &mut Session, mut shape: Shape, select: bool) -> Result<ShapeId> {
+pub(crate) fn add_shape(s: &mut Session, cmd: &str, mut shape: Shape, select: bool) -> Result<ShapeId> {
     s.edit(|doc, sel| {
-        shape.id = ShapeId(doc.alloc_id());
+        shape.id = ShapeId(doc.alloc_id().ok_or_else(|| bad(cmd, NO_ID_SPACE))?);
         if shape.name.is_empty() {
             let base = match &shape.kind {
                 ShapeKind::Picture { .. } => "Picture".to_string(),
@@ -176,7 +176,7 @@ fn insert_shape(s: &mut Session, p: &Value) -> Result<Value> {
     if let (Some(look), false) = (&s.default_look, line_like) {
         super::format::apply_painted(&mut shape, look);
     }
-    let id = add_shape(s, shape, true)?;
+    let id = add_shape(s, "shape.insert", shape, true)?;
     Ok(json!({"id": id}))
 }
 
@@ -204,7 +204,7 @@ fn text_box(s: &mut Session, p: &Value) -> Result<Value> {
             t.body.wrap = Some(false);
         }
     }
-    let id = add_shape(s, shape, true)?;
+    let id = add_shape(s, "insert.textBox", shape, true)?;
     super::text::fit_text_box(s, id)?;
     if text.is_empty() {
         // Start typing immediately.
@@ -341,7 +341,7 @@ fn picture(s: &mut Session, p: &Value) -> Result<Value> {
         }
         _ => [0.0; 4],
     };
-    let media = s.edit(|doc, _| Ok(doc.add_media(&name, ct, bytes)))?;
+    let media = s.edit(|doc, _| doc.add_media(&name, ct, bytes).ok_or_else(|| bad("insert.picture", NO_ID_SPACE)))?;
     let shape = Shape {
         xfrm: Some(rect),
         kind: ShapeKind::Picture { fill: PictureFill { media, crop, ..Default::default() } },
@@ -368,7 +368,7 @@ fn picture(s: &mut Session, p: &Value) -> Result<Value> {
         })?;
         return Ok(json!({"id": ph_id}));
     }
-    let id = add_shape(s, shape, true)?;
+    let id = add_shape(s, "insert.picture", shape, true)?;
     Ok(json!({"id": id}))
 }
 
@@ -389,7 +389,7 @@ fn table(s: &mut Session, p: &Value) -> Result<Value> {
             }
         }
     }
-    let id = add_shape(s, Shape { xfrm: Some(rect), kind: ShapeKind::Table(t), ..Default::default() }, true)?;
+    let id = add_shape(s, "insert.table", Shape { xfrm: Some(rect), kind: ShapeKind::Table(t), ..Default::default() }, true)?;
     Ok(json!({"id": id}))
 }
 
@@ -446,7 +446,7 @@ fn chart(s: &mut Session, p: &Value) -> Result<Value> {
     }
     let size = s.doc()?.doc.slide_size;
     let rect = rect_param(p, "rect").unwrap_or(Xfrm::new(size.width * 0.15, size.height * 0.15, size.width * 0.7, size.height * 0.7));
-    let id = add_shape(s, Shape { xfrm: Some(rect), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() }, true)?;
+    let id = add_shape(s, "insert.chart", Shape { xfrm: Some(rect), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() }, true)?;
     Ok(json!({"id": id}))
 }
 
@@ -498,12 +498,15 @@ fn media(s: &mut Session, p: &Value, video: bool) -> Result<Value> {
     });
     let data = std::sync::Arc::try_unwrap(bytes).unwrap_or_else(|a| (*a).clone());
     let (media, poster) = s.edit(|doc, _| {
-        let media = doc.add_media(&name, ct, data);
-        let poster = poster_png.map(|png| doc.add_media(&format!("{name}-poster.png"), "image/png", png));
+        let media = doc.add_media(&name, ct, data).ok_or_else(|| bad("insert.media", NO_ID_SPACE))?;
+        let poster = match poster_png {
+            Some(png) => Some(doc.add_media(&format!("{name}-poster.png"), "image/png", png).ok_or_else(|| bad("insert.media", NO_ID_SPACE))?),
+            None => None,
+        };
         Ok((media, poster))
     })?;
     let clip = MediaClip { media, video, poster, volume: 1.0, duration_ms, width, height, ..Default::default() };
-    let id = add_shape(s, Shape { xfrm: Some(rect), kind: ShapeKind::Media(clip), descr: name, ..Default::default() }, true)?;
+    let id = add_shape(s, "insert.media", Shape { xfrm: Some(rect), kind: ShapeKind::Media(clip), descr: name, ..Default::default() }, true)?;
     if let Some(w) = &warning {
         s.ui_requests.push(crate::UiRequest::Message { text: w.clone() });
     }
@@ -545,7 +548,7 @@ fn word_art(s: &mut Session, p: &Value) -> Result<Value> {
             }
         }
     }
-    let id = add_shape(s, shape, true)?;
+    let id = add_shape(s, "insert.wordArt", shape, true)?;
     super::text::fit_text_box(s, id)?;
     Ok(json!({"id": id}))
 }
@@ -624,7 +627,7 @@ fn action_button(s: &mut Session, p: &Value) -> Result<Value> {
         click: action.map(|a| Hyperlink { action: a, tooltip: String::new(), highlight_click: true }),
         ..Default::default()
     };
-    let id = add_shape(s, shape, true)?;
+    let id = add_shape(s, "insert.actionButton", shape, true)?;
     Ok(json!({"id": id}))
 }
 
@@ -790,7 +793,7 @@ fn smart_art(s: &mut Session, p: &Value) -> Result<Value> {
             }
         }
         sh.text = Some(body);
-        ids.push(add_shape(s, sh, false)?.0);
+        ids.push(add_shape(s, "insert.smartArt", sh, false)?.0);
     }
     let g = s.execute("arrange.group", &json!({"ids": ids}))?;
     if let Some(gid) = g.get("id").and_then(Value::as_u64) {
diff --git a/crates/engine/src/cmd/media.rs b/crates/engine/src/cmd/media.rs
index 855370ad..d9a3147d 100644
--- a/crates/engine/src/cmd/media.rs
+++ b/crates/engine/src/cmd/media.rs
@@ -139,7 +139,7 @@ fn poster_frame(s: &mut Session, p: &Value) -> Result<Value> {
     let data = s.doc()?.doc.media(m.media).map(|i| i.data.clone()).ok_or_else(|| EngineError::Other("the media data is missing".into()))?;
     let png = poster_png(&data, ms).ok_or_else(|| EngineError::Other("no frame could be decoded there".into()))?;
     let name = format!("poster{id}.png");
-    let poster = s.edit(|doc, _| Ok(doc.add_media(&name, "image/png", png)))?;
+    let poster = s.edit(|doc, _| doc.add_media(&name, "image/png", png).ok_or_else(|| bad("media.posterFrame", NO_ID_SPACE)))?;
     edit_shapes(s, &json!({"id": id}), "media.posterFrame", |sh| {
         if let ShapeKind::Media(m) = &mut sh.kind {
             m.poster = Some(poster);
diff --git a/crates/engine/src/cmd/merge.rs b/crates/engine/src/cmd/merge.rs
index 4c9a6d28..25573da7 100644
--- a/crates/engine/src/cmd/merge.rs
+++ b/crates/engine/src/cmd/merge.rs
@@ -176,7 +176,7 @@ fn merge(s: &mut Session, p: &Value) -> Result<Value> {
             made.push(sh);
         }
         for sh in &mut made {
-            sh.id = ShapeId(doc.alloc_id());
+            sh.id = ShapeId(doc.alloc_id().ok_or_else(|| bad("shape.merge", NO_ID_SPACE))?);
             new_ids.push(sh.id);
         }
         let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("shape.merge", "no slide"))?;
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..50c2e4a6 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -152,6 +152,10 @@ pub fn find_command(id: &str) -> Option<&'static CommandSpec> {
 
 // ---------- param helpers ----------
 
+/// The deck has used every object id (a hostile file can arrive that way): it cannot grow, and
+/// growing would duplicate ids (#407).
+pub(crate) const NO_ID_SPACE: &str = "the presentation has used every object id and can hold no more";
+
 pub(crate) fn bad(cmd: &str, msg: impl Into<String>) -> EngineError {
     EngineError::BadParams { cmd: cmd.into(), msg: msg.into() }
 }
diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..af66cc20 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -284,7 +284,7 @@ fn fill(s: &mut Session, p: &Value) -> Result<Value> {
     } else if p.get("picture").is_some() {
         let (name, bytes) = super::insert::media_bytes(&with_param(p, "data", p.get("picture").cloned().unwrap_or_default()), "shape.fill")?;
         let ct = super::insert::content_type(&name, &bytes);
-        let media = s.edit(|doc, _| Ok(doc.add_media(&name, ct, bytes)))?;
+        let media = s.edit(|doc, _| doc.add_media(&name, ct, bytes).ok_or_else(|| bad("shape.fill", NO_ID_SPACE)))?;
         Some(Some(Fill::Picture(PictureFill { media, ..Default::default() })))
     } else {
         None
@@ -674,7 +674,7 @@ fn picture_reset(s: &mut Session, p: &Value) -> Result<Value> {
 fn picture_change(s: &mut Session, p: &Value) -> Result<Value> {
     let (name, bytes) = super::insert::media_bytes(p, "picture.change")?;
     let ct = super::insert::content_type(&name, &bytes);
-    let media = s.edit(|doc, _| Ok(doc.add_media(&name, ct, bytes)))?;
+    let media = s.edit(|doc, _| doc.add_media(&name, ct, bytes).ok_or_else(|| bad("picture.change", NO_ID_SPACE)))?;
     edit_shapes(s, p, "picture.change", |sh| {
         if let deckcraft_model::ShapeKind::Picture { fill } = &mut sh.kind {
             fill.media = media;
diff --git a/crates/engine/src/cmd/slide.rs b/crates/engine/src/cmd/slide.rs
index 3d8ad344..2c427301 100644
--- a/crates/engine/src/cmd/slide.rs
+++ b/crates/engine/src/cmd/slide.rs
@@ -99,7 +99,7 @@ fn new(s: &mut Session, p: &Value) -> Result<Value> {
                 }
             }
         };
-        let mut slide = defaults::new_slide(doc, layout);
+        let mut slide = defaults::new_slide(doc, layout).ok_or_else(|| bad("slide.new", NO_ID_SPACE))?;
         if let Some(t) = str_param(p, "title")
             && let Some(sh) = slide.shapes.iter_mut().find(|x| x.ph_type().is_some_and(|k| k.is_title()))
         {
@@ -165,8 +165,8 @@ fn duplicate(s: &mut Session, p: &Value) -> Result<Value> {
         for (k, i) in indices.iter().enumerate() {
             let Some(src) = doc.slides.get(*i).map(|x| x.as_ref().clone()) else { continue };
             let mut copy = src;
-            copy.id = SlideId(doc.alloc_id());
-            super::edit::reid(doc, &mut copy.shapes);
+            copy.id = SlideId(doc.alloc_id().ok_or_else(|| bad("slide.duplicate", NO_ID_SPACE))?);
+            super::edit::reid("slide.duplicate", doc, &mut copy.shapes)?;
             // Animations follow the new shape ids by position.
             let old_ids: Vec<_> = doc
                 .slides
@@ -364,7 +364,7 @@ pub fn apply_layout(doc: &mut Presentation, index: usize, layout: LayoutId) -> R
         doc.layout(layout).map(|(_, l)| l.shapes.clone()).ok_or_else(|| bad("slide.layout", "no such layout"))?;
     let mut fresh = vec![];
     for ls in lay_shapes.iter().filter(|x| x.ph.as_ref().is_some_and(|p| !p.kind.is_footer_kind())) {
-        let id = deckcraft_model::ShapeId(doc.alloc_id());
+        let id = deckcraft_model::ShapeId(doc.alloc_id().ok_or_else(|| bad("slide.layout", NO_ID_SPACE))?);
         fresh.push((id, ls.clone()));
     }
     let slide = doc.slides.get_mut(index).ok_or_else(|| bad("slide.layout", "no slide"))?;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..1e3fe1b7 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,28 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// A deck whose ids are used up (a hostile file can arrive with next_id at the top of the
+/// range) refuses to grow instead of handing out duplicate ids (#407).
+#[test]
+fn an_exhausted_id_space_refuses_growth() {
+    let mut s = session();
+    s.execute("slide.new", &json!({})).unwrap();
+    std::sync::Arc::make_mut(&mut s.doc_mut().unwrap().doc).next_id = u32::MAX;
+    let before = s.doc().unwrap().doc.clone();
+    assert!(s.execute("slide.new", &json!({})).is_err(), "a new slide is refused");
+    assert!(s.execute("shape.insert", &json!({"preset": "rect", "rect": [10, 10, 100, 50]})).is_err());
+    assert!(s.execute("slide.duplicate", &json!({})).is_err());
+    assert!(s.execute("edit.duplicate", &json!({})).is_err());
+    // What the deck holds is untouched: same slides, same ids, no duplicates.
+    let after = s.doc().unwrap().doc.clone();
+    assert_eq!(after.slides.len(), before.slides.len());
+    let mut ids = vec![];
+    deckcraft_model::walk(&after.slides[0].shapes, &mut |sh, _| ids.push(sh.id.0));
+    ids.push(after.slides[0].id.0);
+    ids.push(after.next_id);
+    let mut sorted = ids.clone();
+    sorted.sort_unstable();
+    sorted.dedup();
+    assert_eq!(sorted.len(), ids.len(), "no id repeats");
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..a42905b9 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -929,7 +929,7 @@ impl Session {
             let list = cmd::current_shapes(doc, sel).cloned().unwrap_or_default();
             let mut copies: Vec<Shape> = list.iter().filter(|x| ids.contains(&x.id)).cloned().collect();
             let boxes: Vec<Xfrm> = copies.iter().map(|c| xfrm_of(doc, sel, c)).collect();
-            cmd::edit::reid(doc, &mut copies);
+            cmd::edit::reid("edit.duplicate", doc, &mut copies)?;
             for (c, b) in copies.iter_mut().zip(boxes) {
                 c.xfrm = Some(b);
                 c.ph = None;
@@ -1049,7 +1049,7 @@ impl Session {
             let id = match existing {
                 Some(id) => id,
                 None => {
-                    let id = ShapeId(doc.alloc_id());
+                    let id = ShapeId(doc.alloc_id().ok_or_else(|| cmd::bad("ink.draw", cmd::NO_ID_SPACE))?);
                     let size = doc.slide_size;
                     let list = crate::shapes_mut(doc, sel).ok_or_else(|| cmd::bad("ink", "no slide"))?;
                     list.push(Shape {
diff --git a/crates/format/src/lib.rs b/crates/format/src/lib.rs
index 1b37a232..1a12fcff 100644
--- a/crates/format/src/lib.rs
+++ b/crates/format/src/lib.rs
@@ -114,8 +114,9 @@ pub fn load(bytes: &[u8]) -> Result<Presentation> {
     Ok(p)
 }
 
-/// Make a loaded presentation safe to edit: a master exists, every slide's layout exists,
-/// ids are unique, tables are rectangular.
+/// Make a loaded presentation safe to edit: a master exists, every slide's layout exists, tables
+/// are rectangular, and duplicate ids are re-id'd — unless the deck has used every id, in which
+/// case a duplicate stays (growth is refused; see the comment in the loop).
 pub fn repair(p: &mut Presentation) {
     if p.masters.is_empty() {
         let fresh = defaults::blank_presentation(p.slide_size, Default::default(), false);
@@ -128,7 +129,10 @@ pub fn repair(p: &mut Presentation) {
         let needs_layout = p.slides.get(i).is_some_and(|s| p.layout(s.layout).is_none());
         let dup = p.slides.get(i).is_some_and(|s| !seen.insert(s.id));
         if needs_layout || dup {
-            let new_id = if dup { Some(deckcraft_model::SlideId(p.alloc_id())) } else { None };
+            // An exhausted id space leaves a duplicate slide as it is: the engine refuses to
+            // grow such a deck (edits by id stay ambiguous for the duplicate), and the duplicate
+            // stays visible rather than the file failing to open (#407).
+            let new_id = if dup { p.alloc_id().map(deckcraft_model::SlideId) } else { None };
             if let Some(s) = p.slides.get_mut(i) {
                 let s = Arc::make_mut(s);
                 if needs_layout {
@@ -169,7 +173,8 @@ pub fn outline_to_slides(p: &mut Presentation, text: &str) -> usize {
         let line = raw.trim().trim_start_matches(['-', '*', '•']).trim();
         if level == 0 {
             flush(p, cur.take(), &mut made);
-            let mut s = defaults::new_slide(p, lay);
+            // An exhausted id space makes no new slides: what fit is kept (#407).
+            let Some(mut s) = defaults::new_slide(p, lay) else { continue };
             if let Some(t) = s.shapes.first_mut() {
                 t.text = Some(TextBody::from_text(line));
             }
@@ -221,7 +226,7 @@ mod tests {
     #[test]
     fn roundtrip_with_media() {
         let mut p = Presentation::default();
-        let id = p.add_media("a.png", "image/png", vec![1, 2, 3, 4]);
+        let id = p.add_media("a.png", "image/png", vec![1, 2, 3, 4]).expect("media");
         let bytes = save(&p).unwrap();
         assert!(sniff(&bytes));
         let q = load(&bytes).unwrap();
@@ -251,6 +256,17 @@ mod tests {
         assert_eq!(p.slide_size.width, 960.0);
     }
 
+    /// A duplicate slide in a deck whose ids are used up cannot be re-id'd: it stays as it is
+    /// (the engine refuses edits to such a deck) instead of a duplicated fresh id (#407).
+    #[test]
+    fn repair_keeps_a_duplicate_it_cannot_reid() {
+        let mut p = Presentation { next_id: u32::MAX, ..Default::default() };
+        p.slides.push(p.slides[0].clone());
+        repair(&mut p);
+        assert_eq!(p.slides.len(), 2, "the duplicate stays visible");
+        assert_eq!(p.slides[0].id, p.slides[1].id, "no fresh id was invented");
+    }
+
     #[test]
     fn outline_roundtrip() {
         let mut p = defaults::blank_presentation(defaults::WIDE, Default::default(), false);
diff --git a/crates/model/src/defaults.rs b/crates/model/src/defaults.rs
index 8432ce4a..82467b32 100644
--- a/crates/model/src/defaults.rs
+++ b/crates/model/src/defaults.rs
@@ -516,15 +516,20 @@ pub fn blank_presentation(size: Size, theme: Theme, title_slide: bool) -> Presen
         raw_ext: None,
     };
     if title_slide {
+        // A fresh deck starts at id 256 and this builds a handful of ids, so the slide always
+        // fits; should that ever stop holding, the deck arrives without its title slide rather
+        // than with a duplicated id.
         let s = new_slide(&mut p, first_layout);
-        p.slides.push(Arc::new(s));
+        debug_assert!(s.is_some(), "a fresh deck cannot run out of ids");
+        p.slides.extend(s.map(|s| vec![Arc::new(s)]).unwrap_or_default());
     }
     p
 }
 
-/// A slide for `layout` with its placeholders instantiated (empty, inheriting position).
-pub fn new_slide(p: &mut Presentation, layout: LayoutId) -> Slide {
-    let id = SlideId(p.alloc_id());
+/// A slide for `layout` with its placeholders instantiated (empty, inheriting position). `None`
+/// when the deck has used every object id and cannot grow (#407).
+pub fn new_slide(p: &mut Presentation, layout: LayoutId) -> Option<Slide> {
+    let id = SlideId(p.alloc_id()?);
     let mut shapes = vec![];
     let lay_shapes: Vec<Shape> = p.layout(layout).map(|(_, l)| l.shapes.clone()).unwrap_or_default();
     for ls in lay_shapes {
@@ -532,7 +537,7 @@ pub fn new_slide(p: &mut Presentation, layout: LayoutId) -> Slide {
         if ph.kind.is_footer_kind() {
             continue;
         }
-        let sid = ShapeId(p.alloc_id());
+        let sid = ShapeId(p.alloc_id()?);
         shapes.push(Shape {
             id: sid,
             name: ls.name.clone(),
@@ -543,7 +548,7 @@ pub fn new_slide(p: &mut Presentation, layout: LayoutId) -> Slide {
             ..Default::default()
         });
     }
-    Slide { id, layout, shapes, ..Default::default() }
+    Some(Slide { id, layout, shapes, ..Default::default() })
 }
 
 /// Layout for a kind in the first master.
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..7f647842 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -855,10 +855,13 @@ impl Default for Presentation {
 }
 
 impl Presentation {
-    /// A fresh id, unique across slides, shapes, layouts, masters and media in this deck.
-    pub fn alloc_id(&mut self) -> u32 {
-        self.next_id = self.next_id.max(1).saturating_add(1);
-        self.next_id
+    /// A fresh id, unique across slides, shapes, layouts, masters and media in this deck. `None`
+    /// once every id is in use (a hostile file can arrive that way): the deck cannot grow
+    /// further, and callers must refuse the change rather than duplicate ids (#407).
+    pub fn alloc_id(&mut self) -> Option<u32> {
+        let next = self.next_id.max(1).checked_add(1)?;
+        self.next_id = next;
+        Some(next)
     }
     /// Make sure `next_id` is above every id in use (after loading a file).
     pub fn fix_next_id(&mut self) {
@@ -910,13 +913,13 @@ impl Presentation {
         self.media.iter().find(|m| m.id == id)
     }
     /// Add media bytes, reusing an identical existing item.
-    pub fn add_media(&mut self, name: &str, content_type: &str, data: Vec<u8>) -> MediaId {
+    pub fn add_media(&mut self, name: &str, content_type: &str, data: Vec<u8>) -> Option<MediaId> {
         if let Some(m) = self.media.iter().find(|m| m.data.len() == data.len() && *m.data == data) {
-            return m.id;
+            return Some(m.id);
         }
-        let id = MediaId(self.alloc_id());
+        let id = MediaId(self.alloc_id()?);
         self.media.push(MediaItem { id, name: name.into(), content_type: content_type.into(), data: Arc::new(data), link: None });
-        id
+        Some(id)
     }
     /// Section index containing a slide (by position), when sections exist.
     pub fn section_of(&self, slide: SlideId) -> Option<usize> {
diff --git a/crates/model/src/tests.rs b/crates/model/src/tests.rs
index 2c3b4ced..1dc3c559 100644
--- a/crates/model/src/tests.rs
+++ b/crates/model/src/tests.rs
@@ -37,7 +37,7 @@ fn placeholder_inherits_position_and_styles() {
 fn body_levels_from_master() {
     let mut p = Presentation::default();
     let lay = defaults::layout_of_kind(&p, LayoutType::TitleAndContent).unwrap();
-    let s = defaults::new_slide(&mut p, lay);
+    let s = defaults::new_slide(&mut p, lay).expect("slide");
     let ctx = Ctx::for_slide(&p, &s).unwrap();
     let body = &s.shapes[1];
     assert_eq!(body.ph_type(), Some(PhType::Obj));
@@ -97,16 +97,28 @@ fn serde_roundtrip() {
     assert!(q.slides.is_empty());
 }
 
+/// A deck whose ids are used up (a hostile file can arrive that way) yields no further ids:
+/// allocating never repeats one (#407).
+#[test]
+fn exhausted_id_space_allocates_nothing() {
+    let mut p = Presentation { next_id: u32::MAX, ..Default::default() };
+    assert_eq!(p.alloc_id(), None);
+    assert_eq!(p.alloc_id(), None);
+    assert!(p.add_media("x.png", "image/png", vec![9]).is_none(), "fresh media bytes are refused too");
+    let lay = defaults::layout_of_kind(&p, LayoutType::TitleAndContent).unwrap_or_default();
+    assert!(defaults::new_slide(&mut p, lay).is_none(), "a new slide is refused");
+}
+
 #[test]
 fn ids_are_unique_and_fix_next_id() {
     let mut p = Presentation::default();
-    let a = p.alloc_id();
-    let b = p.alloc_id();
+    let a = p.alloc_id().expect("ids");
+    let b = p.alloc_id().expect("ids");
     assert!(b > a);
     p.next_id = 0;
     p.fix_next_id();
     assert!(p.next_id >= b.min(p.next_id));
-    let c = p.alloc_id();
+    let c = p.alloc_id().expect("ids");
     let mut all = vec![];
     for s in &p.slides {
         all.push(s.id.0);
diff --git a/crates/pdf/src/tests.rs b/crates/pdf/src/tests.rs
index 305f1457..e85b6f18 100644
--- a/crates/pdf/src/tests.rs
+++ b/crates/pdf/src/tests.rs
@@ -7,7 +7,7 @@ fn deck(n: usize) -> Presentation {
     let mut p = deckcraft_model::defaults::new_presentation(None);
     let layout = p.slides[0].layout;
     while p.slides.len() < n {
-        let s = deckcraft_model::defaults::new_slide(&mut p, layout);
+        let s = deckcraft_model::defaults::new_slide(&mut p, layout).expect("slide");
         p.slides.push(Arc::new(s));
     }
     for (i, s) in p.slides.iter_mut().enumerate() {
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..09591500 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -354,8 +354,11 @@ fn sanitized(p: &Presentation) -> std::borrow::Cow<'_, Presentation> {
     }
     for m in q.masters.iter_mut() {
         if m.layouts.is_empty() {
-            let id = LayoutId(q.next_id.saturating_add(1));
-            q.next_id = id.0;
+            // An exhausted id space exports without the synthesized layout rather than with a
+            // duplicated one (#407).
+            let Some(raw) = q.next_id.max(1).checked_add(1) else { continue };
+            let id = LayoutId(raw);
+            q.next_id = raw;
             Arc::make_mut(m).layouts.push(Layout {
                 id,
                 name: "Blank".into(),
diff --git a/crates/pptx/tests/fills.rs b/crates/pptx/tests/fills.rs
index e5955c27..98069d11 100644
--- a/crates/pptx/tests/fills.rs
+++ b/crates/pptx/tests/fills.rs
@@ -36,8 +36,8 @@ fn png() -> Vec<u8> {
 /// A deck with one shape filled with a stretched picture, exported.
 fn deck() -> Vec<u8> {
     let mut p = defaults::new_presentation(None);
-    let media = p.add_media("tile.png", "image/png", png());
-    let id = ShapeId(p.alloc_id());
+    let media = p.add_media("tile.png", "image/png", png()).expect("media");
+    let id = ShapeId(p.alloc_id().expect("ids"));
     let first = p.slides[0].id;
     p.slide_mut(first).expect("slide").shapes.push(Shape {
         id,
@@ -86,7 +86,7 @@ fn a_gradient_without_stops_is_saved_without_stops() {
     // must not turn it into a gradient of its own (it used to become solid white).
     use deckcraft_model::style::{Gradient, GradientShape};
     let mut p = defaults::new_presentation(None);
-    let id = ShapeId(p.alloc_id());
+    let id = ShapeId(p.alloc_id().expect("ids"));
     let first = p.slides[0].id;
     let own = Gradient { tile: [0.0; 4], stops: vec![], shape: GradientShape::Linear { angle: 45.0, scaled: true }, rotate_with_shape: true };
     p.slide_mut(first).expect("slide").shapes.push(Shape {
@@ -107,7 +107,7 @@ fn a_gradient_without_stops_is_saved_without_stops() {
 fn a_fill_overlay_round_trips() {
     use deckcraft_model::style::{FillOverlay, Gradient, GradientShape, GradientStop};
     let mut p = defaults::new_presentation(None);
-    let id = ShapeId(p.alloc_id());
+    let id = ShapeId(p.alloc_id().expect("ids"));
     let first = p.slides[0].id;
     let overlay = FillOverlay {
         blend: "mult".into(),
@@ -150,7 +150,7 @@ fn a_gradient_tile_rect_is_read_and_round_trips() {
         tile: [-1.0, -1.0, 0.0, 0.0],
     };
     let mut p = defaults::new_presentation(None);
-    let id = ShapeId(p.alloc_id());
+    let id = ShapeId(p.alloc_id().expect("ids"));
     let first = p.slides[0].id;
     p.slide_mut(first).expect("slide").shapes.push(Shape {
         id,
@@ -174,7 +174,7 @@ fn a_gradient_tile_rect_is_read_and_round_trips() {
 #[test]
 fn a_table_naming_no_style_is_drawn_with_the_table_grid() {
     let mut p = defaults::new_presentation(None);
-    let id = ShapeId(p.alloc_id());
+    let id = ShapeId(p.alloc_id().expect("ids"));
     let first = p.slides[0].id;
     let mut t = deckcraft_model::Table::new(2, 2, 200.0, 40.0);
     t.style = "none".into();
@@ -207,8 +207,8 @@ fn a_table_naming_no_style_is_drawn_with_the_table_grid() {
 #[test]
 fn black_and_white_and_inverted_alpha_pictures_round_trip() {
     let mut p = defaults::new_presentation(None);
-    let media = p.add_media("tile.png", "image/png", png());
-    let id = ShapeId(p.alloc_id());
+    let media = p.add_media("tile.png", "image/png", png()).expect("media");
+    let id = ShapeId(p.alloc_id().expect("ids"));
     let first = p.slides[0].id;
     let mut pf = PictureFill { media, ..Default::default() };
     pf.adjust.bilevel = Some(0.3);
diff --git a/crates/pptx/tests/locks.rs b/crates/pptx/tests/locks.rs
index 2e903e60..60e0d874 100644
--- a/crates/pptx/tests/locks.rs
+++ b/crates/pptx/tests/locks.rs
@@ -15,14 +15,14 @@ fn png() -> Vec<u8> {
 }
 
 fn shape(p: &mut Presentation, name: &str, x: f64) -> Shape {
-    Shape { id: ShapeId(p.alloc_id()), name: name.into(), xfrm: Some(Xfrm::new(x, 40.0, 80.0, 60.0)), ..Default::default() }
+    Shape { id: ShapeId(p.alloc_id().expect("ids")), name: name.into(), xfrm: Some(Xfrm::new(x, 40.0, 80.0, 60.0)), ..Default::default() }
 }
 
 /// Slide 1 of a blank deck holds: a locked shape, an unlocked one, a hidden locked text box, a
 /// locked group (one child unlocked, one hidden), and a locked picture, connector and table.
 fn deck() -> Presentation {
     let mut p = defaults::new_presentation(None);
-    let img = p.add_media("image1.png", "image/png", png());
+    let img = p.add_media("image1.png", "image/png", png()).expect("media");
     let mut v = vec![];
     let mut a = shape(&mut p, "Locked", 0.0);
     a.locked = true;
@@ -40,7 +40,7 @@ fn deck() -> Presentation {
     c3.hidden = true;
     let gx = Xfrm::new(300.0, 40.0, 280.0, 60.0);
     let mut g = Shape {
-        id: ShapeId(p.alloc_id()),
+        id: ShapeId(p.alloc_id().expect("ids")),
         name: "Group".into(),
         xfrm: Some(gx),
         kind: ShapeKind::Group { children: vec![c1, c2, c3], child: gx },
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..fa24da06 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -27,12 +27,12 @@ fn png(w: u32, h: u32, rgb: [u8; 3]) -> Vec<u8> {
 }
 
 fn shape(p: &mut Presentation, name: &str, x: f64, y: f64, w: f64, h: f64) -> Shape {
-    Shape { id: ShapeId(p.alloc_id()), name: name.into(), xfrm: Some(Xfrm::new(x, y, w, h)), ..Default::default() }
+    Shape { id: ShapeId(p.alloc_id().expect("ids")), name: name.into(), xfrm: Some(Xfrm::new(x, y, w, h)), ..Default::default() }
 }
 
 fn new_slide(p: &mut Presentation, title: &str) -> Slide {
     let layout = defaults::layout_of_kind(p, deckcraft_model::LayoutType::TitleOnly).unwrap_or_default();
-    let mut s = defaults::new_slide(p, layout);
+    let mut s = defaults::new_slide(p, layout).expect("slide");
     if let Some(t) = s.shapes.first_mut() {
         t.text = Some(TextBody::from_text(title));
     }
@@ -45,9 +45,9 @@ pub fn rich_deck() -> Presentation {
     p.props.title = "Rich deck".into();
     p.props.author = "DeckCraft tests".into();
     p.props.created = "2025-01-02T03:04:05Z".into();
-    let img = p.add_media("image1.png", "image/png", png(40, 30, [200, 40, 40]));
-    let img2 = p.add_media("image2.png", "image/png", png(8, 8, [20, 140, 220]));
-    let video = p.add_media("clip.mp4", "video/mp4", b"\x00\x00\x00\x18ftypmp42not-a-real-video".to_vec());
+    let img = p.add_media("image1.png", "image/png", png(40, 30, [200, 40, 40])).expect("media");
+    let img2 = p.add_media("image2.png", "image/png", png(8, 8, [20, 140, 220])).expect("media");
+    let video = p.add_media("clip.mp4", "video/mp4", b"\x00\x00\x00\x18ftypmp42not-a-real-video".to_vec()).expect("media");
 
     // Slide 1: title slide with notes and formatted text.
     {
@@ -328,7 +328,7 @@ pub fn rich_deck() -> Presentation {
 
     // Slide 6: bulleted content with a by-paragraph build, a slide link and an equation.
     let layout = defaults::layout_of_kind(&p, deckcraft_model::LayoutType::TitleAndContent).unwrap_or_default();
-    let mut s = defaults::new_slide(&mut p, layout);
+    let mut s = defaults::new_slide(&mut p, layout).expect("slide");
     s.shapes[0].text = Some(TextBody::from_text("Build"));
     s.shapes[1].text = Some(TextBody::from_text("One\nTwo\nThree"));
     let body = s.shapes[1].id;
@@ -589,7 +589,7 @@ fn every_transition_kind_survives() {
     p.slides.clear();
     for (kind, ..) in deckcraft_model::anim::TRANSITIONS {
         let mut s = base.clone();
-        s.id = SlideId(p.alloc_id());
+        s.id = SlideId(p.alloc_id().expect("ids"));
         s.transition = Some(Transition { kind: kind.to_string(), duration_ms: 1200, ..Default::default() });
         p.slides.push(Arc::new(s));
     }
@@ -754,7 +754,7 @@ fn colour_map_overrides_round_trip() {
 #[test]
 fn a_picture_duotone_round_trips() {
     let mut p = defaults::new_presentation(None);
-    let img = p.add_media("image1.png", "image/png", png(4, 4, [128, 128, 128]));
+    let img = p.add_media("image1.png", "image/png", png(4, 4, [128, 128, 128])).expect("media");
     let mut pic = shape(&mut p, "Duotone", 10.0, 10.0, 100.0, 100.0);
     let mut pf = PictureFill { media: img, ..Default::default() };
     pf.adjust.duotone = Some((ColorRef::scheme(SchemeSlot::Accent1).with(ColorTransform::Shade(30000)), ColorRef::rgb(Rgba::rgb(250, 240, 200))));
@@ -867,7 +867,7 @@ fn transition_deck(list: &[(&str, &str, u32, Option<u32>)]) -> (Presentation, Ve
     p.slides.clear();
     for (kind, option, ms, adv) in list {
         let mut s = base.clone();
-        s.id = SlideId(p.alloc_id());
+        s.id = SlideId(p.alloc_id().expect("ids"));
         s.transition = Some(Transition {
             kind: kind.to_string(),
             option: option.to_string(),
diff --git a/crates/pptx/tests/table_styles.rs b/crates/pptx/tests/table_styles.rs
index 015543f2..4a2627af 100644
--- a/crates/pptx/tests/table_styles.rs
+++ b/crates/pptx/tests/table_styles.rs
@@ -20,7 +20,7 @@ fn style_xml() -> String {
 /// An exported deck with a 3x2 table using the probe style.
 fn table_deck() -> Vec<u8> {
     let mut p = defaults::new_presentation(None);
-    let id = ShapeId(p.alloc_id());
+    let id = ShapeId(p.alloc_id().expect("ids"));
     let first = p.slides[0].id;
     let mut t = deckcraft_model::Table::new(3, 2, 300.0, 30.0);
     t.style = "medium2-accent1".into();
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..721b0191 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -361,7 +361,7 @@ fn two_frame_gif() -> Vec<u8> {
 #[test]
 fn animated_gif_shows_the_frame_for_its_time() {
     let mut p = Presentation::default();
-    let media = p.add_media("a.gif", "image/gif", two_frame_gif());
+    let media = p.add_media("a.gif", "image/gif", two_frame_gif()).expect("media");
     let fill = deckcraft_model::style::PictureFill { media, ..Default::default() };
     let sh = Shape { id: ShapeId(600), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Picture { fill }, ..Default::default() };
     std::sync::Arc::make_mut(&mut p.slides[0]).shapes = vec![sh];
@@ -653,7 +653,7 @@ fn a_background_is_laid_over_white() {
     let mut png = std::io::Cursor::new(Vec::new());
     image::DynamicImage::ImageRgb8(image::RgbImage::from_pixel(4, 4, image::Rgb([0, 0, 200]))).write_to(&mut png, image::ImageFormat::Png).unwrap();
     let mut p = deck_with(vec![]);
-    let media = p.add_media("bg.png", "image/png", png.into_inner());
+    let media = p.add_media("bg.png", "image/png", png.into_inner()).expect("media");
     let pf = PictureFill { media, mode: PictureMode::Stretch { fill_rect: [0.5, 0.5, 0.0, 0.0] }, ..Default::default() };
     std::sync::Arc::make_mut(&mut p.slides[0]).background = Some(deckcraft_model::Background::Fill { fill: Fill::Picture(pf) });
     let img = render_slide(&p, 0, &RenderOpts { scale: 0.5, ..Default::default() });
@@ -1149,7 +1149,7 @@ fn half_red_wmf() -> Vec<u8> {
 #[test]
 fn metafile_pictures_draw_their_vectors() {
     let mut p = Presentation::default();
-    let media = p.add_media("image1.wmf", "image/x-wmf", half_red_wmf());
+    let media = p.add_media("image1.wmf", "image/x-wmf", half_red_wmf()).expect("media");
     let fill = deckcraft_model::style::PictureFill { media, ..Default::default() };
     let sh = Shape { id: ShapeId(600), xfrm: Some(Xfrm::new(100.0, 100.0, 400.0, 200.0)), kind: ShapeKind::Picture { fill }, ..Default::default() };
     std::sync::Arc::make_mut(&mut p.slides[0]).shapes = vec![sh];
@@ -1174,7 +1174,7 @@ fn broken_metafiles_draw_nothing_and_never_panic() {
     cases.push(huge);
     for bytes in cases {
         let mut p = Presentation::default();
-        let media = p.add_media("image1.emf", "image/x-emf", bytes);
+        let media = p.add_media("image1.emf", "image/x-emf", bytes).expect("media");
         let fill = deckcraft_model::style::PictureFill { media, ..Default::default() };
         let sh = Shape { id: ShapeId(600), xfrm: Some(Xfrm::new(0.0, 0.0, 400.0, 200.0)), kind: ShapeKind::Picture { fill }, ..Default::default() };
         std::sync::Arc::make_mut(&mut p.slides[0]).shapes = vec![sh];
@@ -1195,7 +1195,7 @@ fn an_object_deckcraft_doesnt_model_shows_its_preview_picture() {
     };
     for with_preview in [true, false] {
         let mut p = Presentation::default();
-        let media = p.add_media("image1.png", "image/png", png.clone());
+        let media = p.add_media("image1.png", "image/png", png.clone()).expect("media");
         let sh = Shape {
             id: ShapeId(600),
             xfrm: Some(Xfrm::new(100.0, 100.0, 400.0, 200.0)),
@@ -1567,7 +1567,7 @@ fn a_picture_casts_its_shadow_from_its_pixels() {
     };
     for as_fill in [false, true] {
         let mut p = Presentation::default();
-        let media = p.add_media("logo.png", "image/png", png.clone());
+        let media = p.add_media("logo.png", "image/png", png.clone()).expect("media");
         let pf = deckcraft_model::style::PictureFill { media, ..Default::default() };
         let mut sh = Shape { id: ShapeId(600), xfrm: Some(Xfrm::new(100.0, 100.0, 400.0, 200.0)), ..Default::default() };
         if as_fill {
diff --git a/crates/render/src/tests_wild.rs b/crates/render/src/tests_wild.rs
index 7e7f0eac..84ee0142 100644
--- a/crates/render/src/tests_wild.rs
+++ b/crates/render/src/tests_wild.rs
@@ -265,7 +265,7 @@ fn png(w: u32, h: u32, rgb: [u8; 3]) -> Vec<u8> {
 
 fn picture_deck(line: Option<Line>) -> Presentation {
     let mut p = Presentation::default();
-    let media = p.add_media("image1.png", "image/png", png(8, 8, [0, 0, 255]));
+    let media = p.add_media("image1.png", "image/png", png(8, 8, [0, 0, 255])).expect("media");
     let sh = Shape {
         id: ShapeId(15),
         xfrm: Some(Xfrm::new(100.0, 100.0, 200.0, 100.0)),
@@ -399,7 +399,7 @@ fn half_red_half_blue() -> Vec<u8> {
 fn tiled(sx: f64, flip: &str, align: &str) -> Image {
     use deckcraft_model::style::{PictureFill, PictureMode};
     let mut p = Presentation::default();
-    let media = p.add_media("t.png", "image/png", half_red_half_blue());
+    let media = p.add_media("t.png", "image/png", half_red_half_blue()).expect("media");
     let mode = PictureMode::Tile { tx: 0.0, ty: 0.0, sx, sy: 10.0, flip: flip.into(), align: align.into() };
     let sh = Shape {
         id: ShapeId(21),
@@ -606,7 +606,7 @@ fn a_large_pictures_shadow_is_whole() {
     let mut counts = vec![];
     for side in [8u32, 400] {
         let mut p = Presentation::default();
-        let media = p.add_media("image1.png", "image/png", png(side, side * 3 / 4, [0, 0, 255]));
+        let media = p.add_media("image1.png", "image/png", png(side, side * 3 / 4, [0, 0, 255])).expect("media");
         let mut fx = offset_shadow();
         if let Some(o) = &mut fx.outer_shadow {
             o.blur = 8.0;
@@ -690,7 +690,7 @@ fn an_upright_picture_fill_stays_upright_in_a_turned_shape() {
     let blue = Rgba::rgb(0, 0, 255);
     for upright in [false, true] {
         let mut p = Presentation::default();
-        let media = p.add_media("t.png", "image/png", half_red_half_blue());
+        let media = p.add_media("t.png", "image/png", half_red_half_blue()).expect("media");
         // Half red (left) half blue picture in a 200 × 200 square turned a quarter (and so
         // covering the same square).
         let sh = Shape {
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index 1e2be177..b9aee025 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -7,7 +7,7 @@ use deckcraft_model::{LayoutType, Presentation, Xfrm};
 fn setup(text: &str, w: f64, h: f64) -> (Presentation, Shape) {
     let mut p = Presentation::default();
     let lay = defaults::layout_of_kind(&p, LayoutType::TitleAndContent).unwrap();
-    let mut s = defaults::new_slide(&mut p, lay);
+    let mut s = defaults::new_slide(&mut p, lay).expect("slide");
     let mut body = s.shapes.remove(1);
     body.xfrm = Some(Xfrm::new(0.0, 0.0, w, h));
     body.text = Some(TextBody::from_text(text));

From 82dcd86c887b188e5c9bfc4edf596ec0449d946b Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 18:22:48 +0300
Subject: [PATCH 097/376] Pptx: read and write embedded fonts

A deck that embeds a TrueType or OpenType face, including one wrapped as Embedded OpenType, now draws with that face and saves it back. MicroType Express subsets stay in the file and still draw in a stand-in.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                     |   2 +
 crates/engine/src/cmd/file.rs  |   1 +
 crates/engine/src/fonts.rs     |  15 +++++
 crates/engine/src/tests.rs     |  18 ++++++
 crates/fonts/src/lib.rs        |  62 +++++++++++++++++++
 crates/model/src/lib.rs        |  33 +++++++++-
 crates/pptx/src/read/mod.rs    |  59 +++++++++++++++++-
 crates/pptx/src/write/mod.rs   | 107 ++++++++++++++++++++++++++++++++-
 crates/pptx/tests/roundtrip.rs |  94 +++++++++++++++++++++++++++++
 docs/file-format-parity.md     |   7 ++-
 docs/gaps.md                   |   9 +--
 docs/roadmap.md                |   5 +-
 12 files changed, 398 insertions(+), 14 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..c3a17788 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Embedded fonts (`p:embeddedFontLst`) are read, written and used to draw. TrueType, OpenType and Embedded OpenType faces load; MicroType Express subsets are kept for the round trip and still draw in a stand-in |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: embedded fonts |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..12c1ecd1 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -88,6 +88,7 @@ pub fn open_presentation(name: &str, bytes: &[u8]) -> Result<Presentation> {
 
 pub fn add_opened(s: &mut Session, name: &str, path: Option<String>, p: Presentation) -> usize {
     let title = std::path::Path::new(name).file_stem().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| name.to_string());
+    crate::fonts::install_embedded_fonts(&p);
     let missing_fonts = crate::fonts::missing_fonts(&p);
     let mut st = DocState::new(p, path, title);
     st.missing_fonts = missing_fonts;
diff --git a/crates/engine/src/fonts.rs b/crates/engine/src/fonts.rs
index fcbd2feb..5c5c9f25 100644
--- a/crates/engine/src/fonts.rs
+++ b/crates/engine/src/fonts.rs
@@ -6,6 +6,21 @@ use deckcraft_model::resolve::{self, Ctx};
 use deckcraft_model::text::{Bullet, TextBody};
 use deckcraft_model::{Presentation, Shape, ShapeKind};
 
+/// Load each embedded face into the font database, so text in that family draws with the file's
+/// font on a machine that doesn't have it. A face already loaded (bundled or installed) stays;
+/// the part bytes are kept either way. MicroType Express subsets have no TrueType or OpenType
+/// font to load and are left for the round trip.
+pub fn install_embedded_fonts(p: &Presentation) {
+    let db = FontDb::global();
+    for font in &p.embedded_fonts {
+        for id in font.faces().into_iter().flatten() {
+            let Some(item) = p.media(id) else { continue };
+            let Some(sfnt) = deckcraft_fonts::embedded_sfnt(&item.data) else { continue };
+            db.add_font(sfnt.to_vec());
+        }
+    }
+}
+
 /// The font families the slides' text is drawn in (theme fonts resolved, bullet fonts included)
 /// that aren't installed or bundled, sorted, without duplicates (case-insensitive).
 pub fn missing_fonts(p: &Presentation) -> Vec<String> {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..5f678313 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -528,6 +528,24 @@ fn opening_a_file_lists_the_fonts_it_uses_that_are_missing() {
     assert!(s.doc().unwrap().missing_fonts.is_empty());
 }
 
+#[test]
+fn an_embedded_face_is_used_when_the_machine_lacks_it() {
+    let mut p = deckcraft_model::Presentation::default();
+    let slide = std::sync::Arc::make_mut(&mut p.slides[0]);
+    let mut body = deckcraft_model::text::TextBody::from_text("Hello");
+    body.paragraphs[0].runs[0].props.font = Some("DeckCraft Colr Squares".into());
+    slide.shapes[0].text = Some(body);
+    let id = p.add_media("font1.fntdata", "application/x-fontdata", include_bytes!("../../render/tests/fixtures/colr-squares.ttf").to_vec());
+    p.embedded_fonts.push(deckcraft_model::EmbeddedFont { typeface: "DeckCraft Colr Squares".into(), regular: Some(id), ..Default::default() });
+    let data = crate::cmd::base64_encode(&crate::cmd::file::save_bytes(&p, "pptx").unwrap());
+    let mut s = Session::with_new();
+    let r = s.execute("file.openBytes", &json!({"name": "fonts.pptx", "data": data})).unwrap();
+    assert_eq!(r["missingFonts"], json!([]));
+    let font = s.doc().unwrap().doc.embedded_fonts.first().unwrap();
+    assert_eq!(font.typeface, "DeckCraft Colr Squares");
+    assert!(font.regular.is_some());
+}
+
 #[test]
 fn clicks_in_flipped_shapes_hit_the_text_where_it_is_drawn() {
     // Flips don't mirror text, so a click lands on the character drawn under it.
diff --git a/crates/fonts/src/lib.rs b/crates/fonts/src/lib.rs
index 978661bb..daf0d77e 100644
--- a/crates/fonts/src/lib.rs
+++ b/crates/fonts/src/lib.rs
@@ -40,6 +40,43 @@ pub fn japanese_fonts() -> impl Iterator<Item = &'static CraftFont> {
     CRAFT_FONTS.iter().filter(|f| f.scripts.contains(&"Jpan"))
 }
 
+/// The TrueType or OpenType font inside a PresentationML embedded-font part
+/// (`application/x-fontdata`).
+///
+/// The part is the font itself, or an Embedded OpenType wrapper around it (the `0x504C` magic
+/// at byte 34, from the W3C Embedded OpenType submission). A MicroType Express subset is neither,
+/// so this returns none; the original part stays in the file for the round trip.
+pub fn embedded_sfnt(part: &[u8]) -> Option<&[u8]> {
+    eot_payload(part).or_else(|| sfnt_or_collection(part).then_some(part))
+}
+
+fn sfnt_or_collection(b: &[u8]) -> bool {
+    b.len() >= 12
+        && (b.starts_with(&[0x00, 0x01, 0x00, 0x00])
+            || b.starts_with(b"OTTO")
+            || b.starts_with(b"true")
+            || b.starts_with(b"typ1")
+            || b.starts_with(b"ttcf"))
+}
+
+/// Font data at the end of an Embedded OpenType blob, when the header is one.
+fn eot_payload(b: &[u8]) -> Option<&[u8]> {
+    if b.len() < 82 || u16::from_le_bytes([b[34], b[35]]) != 0x504C {
+        return None;
+    }
+    let version = u32::from_le_bytes(b.get(8..12)?.try_into().ok()?);
+    if !matches!(version, 0x0001_0000 | 0x0002_0001 | 0x0002_0002) {
+        return None;
+    }
+    let eot_size = u32::from_le_bytes(b.get(0..4)?.try_into().ok()?) as usize;
+    let font_size = u32::from_le_bytes(b.get(4..8)?.try_into().ok()?) as usize;
+    if font_size < 12 || eot_size < font_size.saturating_add(82) || eot_size > b.len() {
+        return None;
+    }
+    let font = b.get(eot_size - font_size..eot_size)?;
+    sfnt_or_collection(font).then_some(font)
+}
+
 /// Japanese faces in document-fallback order: Mincho (serif) families first, matching the
 /// serif default text font, then the others; Regular before other styles.
 pub fn japanese_document_fonts() -> Vec<&'static CraftFont> {
@@ -299,4 +336,29 @@ mod tests {
             assert_eq!(db.face("Calibri", "Bold").family, "Carlito");
         }
     }
+
+    /// An Embedded OpenType header of `version` around `font`, with the font at the end.
+    fn wrap_eot(font: &[u8], version: u32) -> Vec<u8> {
+        let mut h = vec![0u8; 82];
+        let total = 82 + font.len();
+        h[0..4].copy_from_slice(&(total as u32).to_le_bytes());
+        h[4..8].copy_from_slice(&(font.len() as u32).to_le_bytes());
+        h[8..12].copy_from_slice(&version.to_le_bytes());
+        h[34..36].copy_from_slice(&0x504Cu16.to_le_bytes());
+        h.extend_from_slice(font);
+        h
+    }
+
+    #[test]
+    fn embedded_open_type_yields_the_font() {
+        let font = epaint_default_fonts::UBUNTU_LIGHT;
+        assert_eq!(embedded_sfnt(font), Some(font));
+        assert_eq!(embedded_sfnt(&wrap_eot(font, 0x0002_0001)), Some(font));
+        assert_eq!(embedded_sfnt(&wrap_eot(font, 0x0001_0000)), Some(font));
+        assert!(embedded_sfnt(b"not a font file").is_none());
+        assert!(embedded_sfnt(&wrap_eot(b"hello world!!", 0x0002_0002)).is_none());
+        let mut truncated = wrap_eot(font, 0x0002_0001);
+        truncated.truncate(40);
+        assert!(embedded_sfnt(&truncated).is_none());
+    }
 }
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..a692b91a 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -802,6 +802,35 @@ pub struct Properties {
     pub revision: u32,
 }
 
+/// One typeface embedded in the presentation (`p:embeddedFont`). Each slot is a font file in
+/// [`Presentation::media`]: regular, bold, italic, bold italic. A slot is absent when the file
+/// didn't include that face.
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+#[serde(default, rename_all = "camelCase")]
+pub struct EmbeddedFont {
+    pub typeface: String,
+    /// `panose` on `p:font`, when the file gave the 20 hex digits.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub panose: Option<String>,
+    /// `pitchFamily` on `p:font`.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub pitch_family: Option<u8>,
+    /// `charset` on `p:font`.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub charset: Option<u8>,
+    pub regular: Option<MediaId>,
+    pub bold: Option<MediaId>,
+    pub italic: Option<MediaId>,
+    pub bold_italic: Option<MediaId>,
+}
+
+impl EmbeddedFont {
+    /// The four face slots, in the order the package stores them.
+    pub fn faces(&self) -> [Option<MediaId>; 4] {
+        [self.regular, self.bold, self.italic, self.bold_italic]
+    }
+}
+
 /// An embedded file (image, audio, video, font, workbook).
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "camelCase")]
@@ -838,8 +867,8 @@ pub struct Presentation {
     pub first_slide_number: u32,
     /// Next free shape/slide/layout/media id.
     pub next_id: u32,
-    /// Embedded fonts (family names; bytes in `media`).
-    pub embedded_fonts: Vec<(String, MediaId)>,
+    /// Embedded fonts. The face bytes live in [`Self::media`].
+    pub embedded_fonts: Vec<EmbeddedFont>,
     /// Table styles defined in the file (`ppt/tableStyles.xml`).
     #[serde(skip_serializing_if = "Vec::is_empty")]
     pub table_styles: Vec<table::TableStyleDef>,
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..83757c84 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -14,8 +14,8 @@ use std::sync::Arc;
 use deckcraft_geom::{Size, emu_to_pt};
 use deckcraft_model::text::TextBody;
 use deckcraft_model::{
-    Background, Comment, CustomShow, Geom, HeaderFooter, Layout, LayoutId, LayoutType, Master, MasterId, MediaId, MediaItem, PhType, Presentation,
-    Properties, Section, ShowSettings, Slide, SlideId, defaults,
+    Background, Comment, CustomShow, EmbeddedFont, Geom, HeaderFooter, Layout, LayoutId, LayoutType, Master, MasterId, MediaId, MediaItem, PhType,
+    Presentation, Properties, Section, ShowSettings, Slide, SlideId, defaults,
 };
 
 use crate::PptxError;
@@ -399,12 +399,67 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
 
     inherit_placeholder_geometry(&mut p);
     p.header_footer = header_footer(&p);
+    p.embedded_fonts = read_embedded_fonts(&mut imp, &pres_part, pres_el);
     p.media = std::mem::take(&mut imp.media);
     p.next_id = imp.next;
     p.fix_next_id();
     Ok(p)
 }
 
+/// Embedded font faces in one file. Past this, further typefaces are dropped.
+const MAX_EMBEDDED_FONTS: usize = 64;
+/// One font part. A larger part is skipped; the rest of the file is still read.
+const MAX_FONT_BYTES: usize = 32 * 1024 * 1024;
+
+/// `p:embeddedFontLst`: each typeface and the font parts its four face slots point at.
+fn read_embedded_fonts(imp: &mut Imp, pres: &Part, root: &El) -> Vec<EmbeddedFont> {
+    let Some(list) = root.child("embeddedFontLst") else { return Vec::new() };
+    let mut out = Vec::new();
+    for e in list.children_named("embeddedFont").take(MAX_EMBEDDED_FONTS) {
+        let Some(font) = e.child("font") else { continue };
+        let Some(typeface) = font.attr("typeface").map(str::trim).filter(|t| !t.is_empty()) else { continue };
+        let typeface: String = typeface.chars().take(255).collect();
+        let slot = |imp: &mut Imp, name: &str| -> Option<MediaId> {
+            let id = e.child(name)?.attr("r:id")?;
+            let part = pres.rels.target(id)?;
+            let data = imp.pkg.get(part)?;
+            if data.is_empty() || data.len() > MAX_FONT_BYTES {
+                log::warn!("pptx: embedded font {part} skipped ({} bytes)", data.len());
+                return None;
+            }
+            imp.media_for(part)
+        };
+        let regular = slot(imp, "regular");
+        let bold = slot(imp, "bold");
+        let italic = slot(imp, "italic");
+        let bold_italic = slot(imp, "boldItalic");
+        if regular.is_none() && bold.is_none() && italic.is_none() && bold_italic.is_none() {
+            continue;
+        }
+        out.push(EmbeddedFont {
+            typeface,
+            panose: panose_attr(font),
+            pitch_family: byte_attr(font, "pitchFamily"),
+            charset: byte_attr(font, "charset"),
+            regular,
+            bold,
+            italic,
+            bold_italic,
+        });
+    }
+    out
+}
+
+fn byte_attr(el: &El, name: &str) -> Option<u8> {
+    u8::try_from(el.u32(name)?).ok()
+}
+
+/// `panose` is 20 hex digits (ST_Panose). Anything else is dropped.
+fn panose_attr(el: &El) -> Option<String> {
+    let v = el.attr("panose")?.trim();
+    (v.len() == 20 && v.chars().all(|c| c.is_ascii_hexdigit())).then(|| v.to_string())
+}
+
 fn sane_len(v: f64, dflt: f64) -> f64 {
     if v.is_finite() && (1.0..=20_000.0).contains(&v) { v } else { dflt }
 }
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..08c282fc 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -665,11 +665,99 @@ fn section_slides(p: &Presentation) -> Vec<(String, Vec<usize>)> {
     out
 }
 
+/// One embedded typeface, with the relationship id of each face that had bytes.
+struct WrittenFont {
+    typeface: String,
+    panose: Option<String>,
+    pitch_family: Option<u8>,
+    charset: Option<u8>,
+    regular: Option<String>,
+    bold: Option<String>,
+    italic: Option<String>,
+    bold_italic: Option<String>,
+}
+
+impl WrittenFont {
+    fn any(&self) -> bool {
+        self.regular.is_some() || self.bold.is_some() || self.italic.is_some() || self.bold_italic.is_some()
+    }
+}
+
+/// Font parts for `p:embeddedFontLst`. One part per distinct media item, named `ppt/fonts/fontN.fntdata`.
+fn write_embedded_fonts(x: &mut Exp, o: &mut Out) -> Vec<WrittenFont> {
+    struct Plan {
+        typeface: String,
+        panose: Option<String>,
+        pitch_family: Option<u8>,
+        charset: Option<u8>,
+        regular: Option<MediaId>,
+        bold: Option<MediaId>,
+        italic: Option<MediaId>,
+        bold_italic: Option<MediaId>,
+    }
+    let mut plans = Vec::new();
+    for font in x.p.embedded_fonts.iter().take(64) {
+        let typeface = font.typeface.trim();
+        if typeface.is_empty() {
+            continue;
+        }
+        plans.push(Plan {
+            typeface: typeface.chars().take(255).collect(),
+            panose: font.panose.clone().filter(|s| s.len() == 20 && s.chars().all(|c| c.is_ascii_hexdigit())),
+            pitch_family: font.pitch_family,
+            charset: font.charset,
+            regular: font.regular,
+            bold: font.bold,
+            italic: font.italic,
+            bold_italic: font.bold_italic,
+        });
+    }
+    let mut seen_part: HashMap<MediaId, String> = HashMap::new();
+    let mut n = 0u32;
+    let mut rel = |x: &mut Exp, o: &mut Out, id: Option<MediaId>| -> Option<String> {
+        let id = id?;
+        if let Some(rid) = seen_part.get(&id) {
+            return Some(rid.clone());
+        }
+        let m = x.p.media(id)?;
+        if m.data.is_empty() || m.data.len() > 32 * 1024 * 1024 {
+            return None;
+        }
+        let bytes = m.data.as_ref().clone();
+        n = n.saturating_add(1);
+        let name = format!("ppt/fonts/font{n}.fntdata");
+        x.pkg.binary(&name, "application/x-fontdata", bytes);
+        let rid = o.rels.add("font", &opc::relative("ppt/presentation.xml", &name), false);
+        seen_part.insert(id, rid.clone());
+        Some(rid)
+    };
+    let mut seen_face = Vec::new();
+    let mut out = Vec::new();
+    for font in plans {
+        let written = WrittenFont {
+            typeface: font.typeface,
+            panose: font.panose,
+            pitch_family: font.pitch_family,
+            charset: font.charset,
+            regular: rel(x, o, font.regular),
+            bold: rel(x, o, font.bold),
+            italic: rel(x, o, font.italic),
+            bold_italic: rel(x, o, font.bold_italic),
+        };
+        if written.any() && !seen_face.iter().any(|s| s == &written.typeface) {
+            seen_face.push(written.typeface.clone());
+            out.push(written);
+        }
+    }
+    out
+}
+
 fn presentation_xml(x: &mut Exp, o: &mut Out, masters: &[(u64, String)], notes: Option<&str>, slides: &[String]) -> Vec<u8> {
+    let fonts = write_embedded_fonts(x, o);
     let p = x.p;
     let mut w = W::new();
     let first = (p.first_slide_number != 1).then_some(p.first_slide_number.min(9999));
-    root_open(&mut w, "p:presentation", A::new().a("saveSubsetFonts", 1).o("firstSlideNum", first));
+    root_open(&mut w, "p:presentation", A::new().a("saveSubsetFonts", 1).t("embedTrueTypeFonts", !fonts.is_empty()).o("firstSlideNum", first));
     w.open0("p:sldMasterIdLst");
     for (id, rid) in masters {
         w.empty("p:sldMasterId", A::new().a("id", id).a("r:id", rid));
@@ -690,6 +778,23 @@ fn presentation_xml(x: &mut Exp, o: &mut Out, masters: &[(u64, String)], notes:
     let clamp = |v: f64| dml::emu(v).clamp(914_400, 51_206_400);
     w.empty("p:sldSz", A::new().a("cx", clamp(p.slide_size.width)).a("cy", clamp(p.slide_size.height)));
     w.empty("p:notesSz", A::new().a("cx", dml::emu_pos(p.notes_size.width).max(1)).a("cy", dml::emu_pos(p.notes_size.height).max(1)));
+    if !fonts.is_empty() {
+        w.open0("p:embeddedFontLst");
+        for f in &fonts {
+            w.open0("p:embeddedFont");
+            w.empty(
+                "p:font",
+                A::new().a("typeface", &f.typeface).o("panose", f.panose.clone()).o("pitchFamily", f.pitch_family).o("charset", f.charset),
+            );
+            for (tag, rid) in [("p:regular", &f.regular), ("p:bold", &f.bold), ("p:italic", &f.italic), ("p:boldItalic", &f.bold_italic)] {
+                if let Some(rid) = rid {
+                    w.empty(tag, A::new().a("r:id", rid));
+                }
+            }
+            w.close("p:embeddedFont");
+        }
+        w.close("p:embeddedFontLst");
+    }
     if !p.custom_shows.is_empty() {
         w.open0("p:custShowLst");
         for (i, cs) in p.custom_shows.iter().enumerate() {
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..6c4acebd 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,97 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+#[test]
+fn embedded_fonts_round_trip() {
+    let mut p = Presentation::default();
+    let regular = p.add_media("font1.fntdata", "application/x-fontdata", b"REGULAR-FONT-BYTES-0123456789".to_vec());
+    let bold = p.add_media("font2.fntdata", "application/x-fontdata", b"BOLD-FONT-BYTES-0123456789abcd".to_vec());
+    p.embedded_fonts.push(deckcraft_model::EmbeddedFont {
+        typeface: "Deck Test Face".into(),
+        panose: Some("020B0604020202020204".into()),
+        pitch_family: Some(34),
+        charset: Some(0),
+        regular: Some(regular),
+        bold: Some(bold),
+        italic: Some(regular),
+        bold_italic: None,
+    });
+    // The same typeface again is one entry: PowerPoint requires each typeface once.
+    p.embedded_fonts.push(deckcraft_model::EmbeddedFont { typeface: "Deck Test Face".into(), regular: Some(bold), ..Default::default() });
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut zip = zip::ZipArchive::new(std::io::Cursor::new(bytes.clone())).expect("zip");
+    let mut xml = String::new();
+    std::io::Read::read_to_string(&mut zip.by_name("ppt/presentation.xml").expect("pres"), &mut xml).expect("read");
+    assert!(xml.contains("embedTrueTypeFonts=\"1\""));
+    let notes = xml.find("<p:notesSz").expect("notesSz");
+    let list = xml.find("<p:embeddedFontLst>").expect("list");
+    let dts = xml.find("<p:defaultTextStyle").expect("style");
+    assert!(notes < list && list < dts);
+    assert!(xml.contains(r#"<p:font typeface="Deck Test Face" panose="020B0604020202020204" pitchFamily="34" charset="0"/>"#));
+    assert_eq!(xml.matches("<p:embeddedFont>").count(), 1);
+    let mut rels = String::new();
+    std::io::Read::read_to_string(&mut zip.by_name("ppt/_rels/presentation.xml.rels").expect("rels"), &mut rels).expect("read");
+    assert_eq!(rels.matches("relationships/font").count(), 2, "regular and italic share one part");
+    let q = deckcraft_pptx::import(&bytes).expect("import");
+    assert_eq!(q.embedded_fonts.len(), 1);
+    let f = &q.embedded_fonts[0];
+    assert_eq!(f.typeface, "Deck Test Face");
+    assert_eq!(f.panose.as_deref(), Some("020B0604020202020204"));
+    assert_eq!(f.pitch_family, Some(34));
+    assert_eq!(f.charset, Some(0));
+    assert_eq!(q.media(f.regular.expect("regular")).expect("media").data.as_slice(), b"REGULAR-FONT-BYTES-0123456789");
+    assert_eq!(q.media(f.bold.expect("bold")).expect("media").data.as_slice(), b"BOLD-FONT-BYTES-0123456789abcd");
+    assert_eq!(f.italic, f.regular);
+    assert!(f.bold_italic.is_none());
+}
+
+/// A package whose font list this writer did not produce: bold only, relationship id not `rIdN`.
+#[test]
+fn an_embedded_font_list_already_in_the_package_is_read() {
+    let bytes = deckcraft_pptx::export(&Presentation::default()).expect("export");
+    let font = b"FACE-BYTES-FROM-THE-PACKAGE";
+    let mut zip = zip::ZipArchive::new(std::io::Cursor::new(bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+    for i in 0..zip.len() {
+        let mut f = zip.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        let mut data = vec![];
+        std::io::Read::read_to_end(&mut f, &mut data).expect("read");
+        if name == "ppt/presentation.xml" {
+            let xml = String::from_utf8(data).expect("utf8");
+            let xml = xml.replacen(
+                "<p:defaultTextStyle",
+                concat!(
+                    r#"<p:embeddedFontLst><p:embeddedFont><p:font typeface="Package Face" pitchFamily="2"/>"#,
+                    r#"<p:bold r:id="rIdFont"/></p:embeddedFont></p:embeddedFontLst><p:defaultTextStyle"#
+                ),
+                1,
+            );
+            data = xml.into_bytes();
+        } else if name == "ppt/_rels/presentation.xml.rels" {
+            let xml = String::from_utf8(data).expect("utf8");
+            let xml = xml.replacen(
+                "</Relationships>",
+                r#"<Relationship Id="rIdFont" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/font" Target="fonts/font1.fntdata"/></Relationships>"#,
+                1,
+            );
+            data = xml.into_bytes();
+        } else if name == "[Content_Types].xml" {
+            let xml = String::from_utf8(data).expect("utf8");
+            let xml = xml.replacen("</Types>", r#"<Default Extension="fntdata" ContentType="application/x-fontdata"/></Types>"#, 1);
+            data = xml.into_bytes();
+        }
+        out.start_file(name, zip::write::SimpleFileOptions::default()).expect("start");
+        std::io::Write::write_all(&mut out, &data).expect("write");
+    }
+    out.start_file("ppt/fonts/font1.fntdata", zip::write::SimpleFileOptions::default()).expect("font");
+    std::io::Write::write_all(&mut out, font).expect("font bytes");
+    let patched = out.finish().expect("finish").into_inner();
+    let p = deckcraft_pptx::import(&patched).expect("import");
+    let f = p.embedded_fonts.first().expect("font");
+    assert_eq!(f.typeface, "Package Face");
+    assert_eq!(f.pitch_family, Some(2));
+    assert!(f.panose.is_none() && f.regular.is_none() && f.italic.is_none() && f.bold_italic.is_none());
+    assert_eq!(p.media(f.bold.expect("bold")).expect("media").data.as_slice(), font);
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..81956842 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (embedded fonts read, written and drawn; MicroType Express subsets kept but not drawn; previously trivial: groups with a small legacy child coordinate space, #233) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -48,7 +48,7 @@ PowerPoint opens and saves; Viewer = opens only).
 | Online video (YouTube embeds) | yes | no | Cloud feature |
 | Embedded OLE objects | yes | kept on round trip (opaque), not insertable or editable | `ShapeKind::Opaque` |
 | 3-D models (`.glb`) | yes | no | |
-| Embedded fonts | yes | no | `p:embeddedFontLst` ignored |
+| Embedded fonts | yes | yes | `p:embeddedFontLst` read and written. TrueType, OpenType and Embedded OpenType faces are used to draw; MicroType Express subsets are kept and written back, not drawn |
 
 ## PPTX coverage (PresentationML / DrawingML)
 
@@ -84,7 +84,7 @@ the round trip even though DeckCraft doesn't model it.
 | Comments: modern threaded (`p188`) | yes | no (written as legacy) | Replies and resolved state lost (#70) |
 | Unknown slide-level elements (`graphicFrame` OLE, extensions, `mc:AlternateContent`) | kept | kept | Rendered as a labelled placeholder with the preview picture when present |
 | Tags, custom XML, VBA | no / no / no | | |
-| Embedded fonts | no | no | |
+| Embedded fonts | yes | yes | MicroType Express subsets kept, not drawn |
 | Encryption (password to open) | no | no | |
 
 ### What would move the PPTX number
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Embedded fonts read and written; TrueType, OpenType and Embedded OpenType faces drawn |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..6b4397f9 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (embedded fonts are read, written and drawn, except MicroType Express subsets; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -121,9 +121,9 @@ Detail in [file-format-parity.md](file-format-parity.md).
 - **Estimate:** 10–16 h (render the timeline frame by frame; an H.264 encoder is the hard part,
   FilmCraft has one to copy).
 
-### Embedded fonts aren't read or written
-- **Evidence:** no `p:embeddedFontLst` handling in `crates/pptx`.
-- **Impact:** decks that rely on embedded fonts reflow.
+### Embedded MicroType Express font subsets aren't drawn
+- **Evidence:** `p:embeddedFontLst` is read and written. A raw TrueType/OpenType face, or one inside an Embedded OpenType wrapper, is loaded and used to draw. A MicroType Express subset (`application/x-fontdata` with neither form) is kept and written back, and the text still uses a stand-in.
+- **Impact:** decks that embed a MicroType subset reflow until that face is installed.
 - **Estimate:** 3–5 h.
 
 ## Features
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Embedded fonts are read, written and drawn (TrueType, OpenType, Embedded OpenType). The gap is now MicroType Express subsets, which are kept but not drawn |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..393f1182 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (embedded fonts leave the beta list except MicroType Express subsets; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -40,7 +40,7 @@ Beta means ~75% ready for real work and opening and saving PowerPoint's `.pptx`
 |---|---|---|---|
 | 1 | Stability: #60, #40/#59, soak and fuzz the editor | 10–20 | Stability 60 → 85% |
 | 2 | PPTX real-deck corpus and fixes | 20–35 | File formats 58 → 75% |
-| 3 | PPTX round-trip losses (#70, #74, #77), `.potx`/`.ppsx`/`.pptm` content types, embedded fonts | 8–15 | File formats → 80% |
+| 3 | PPTX round-trip losses (#70, #74, #77), `.potx`/`.ppsx`/`.pptm` content types, MicroType embedded-font subsets | 8–15 | File formats → 80% |
 | 4 | EMF/WMF and SVG pictures | 8–14 | File formats, Pictures |
 | 5 | Vector PDF, printing | 10–16 | File formats, Files |
 | 6 | Localization infrastructure + zh-Hans, es, fr, de, ja (with IME) | 27–46 | Localization 8 → ~40% |
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Beta item 3: embedded fonts are in, except MicroType Express subsets |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |

From 525b7ed3f9376aba067759ed309fdaa6d2e6bb99 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 18:31:02 +0300
Subject: [PATCH 098/376] Palette: skip commands that need a value

Searching for Export ran file.export with an empty object and reported a missing path. The palette now offers only commands that accept that call, so Export opens the dialog.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                   |   2 +
 crates/engine/src/cmd/mod.rs | 101 +++++++++++++++++++++++++++++++++++
 crates/ui-egui/src/menus.rs  |  11 +++-
 docs/gaps.md                 |   4 +-
 docs/target-app-parity.md    |   5 +-
 docs/ui-parity.md            |   7 +--
 6 files changed, 121 insertions(+), 9 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..49276273 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | The command palette skips commands that need a value, so searching for Export runs the export dialog (#79) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: command palette Export (#79) |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..4e3ac8e5 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -331,6 +331,78 @@ pub(crate) fn current_shapes<'a>(doc: &'a deckcraft_model::Presentation, sel: &c
     }
 }
 
+/// The command palette runs a command with `{}`. True when the params doc names a value that
+/// call would have to supply (`path`, `rows`, `path? | data`), so the palette must not offer it.
+/// A name ending in `?` is optional. Text after `→` is the result, not an input.
+pub fn needs_arguments(params: &str) -> bool {
+    let input = params.split('→').next().unwrap_or(params);
+    let Some(start) = input.find('{') else { return false };
+    let inside = input.get(start + 1..).unwrap_or("");
+    let inside = inside.split('}').next().unwrap_or(inside);
+    split_fields(inside).iter().any(|f| field_requires(f.trim()))
+}
+
+fn split_fields(s: &str) -> Vec<&str> {
+    let mut out = Vec::new();
+    let mut start = 0;
+    let mut depth = 0i32;
+    let mut quote = false;
+    for (i, c) in s.char_indices() {
+        if quote {
+            if c == '"' {
+                quote = false;
+            }
+            continue;
+        }
+        match c {
+            '"' => quote = true,
+            '[' | '(' => depth += 1,
+            ']' | ')' => depth = depth.saturating_sub(1),
+            ',' if depth == 0 => {
+                out.push(s.get(start..i).unwrap_or(""));
+                start = i + c.len_utf8();
+            }
+            _ => {}
+        }
+    }
+    out.push(s.get(start..).unwrap_or(""));
+    out
+}
+
+/// A field needs a value unless every alternative (`path? | data`) is an optional parameter.
+fn field_requires(field: &str) -> bool {
+    if field.is_empty() {
+        return false;
+    }
+    let alts: Vec<&str> = if field.contains(" | ") { field.split(" | ").map(str::trim).filter(|s| !s.is_empty()).collect() } else { vec![field] };
+    let mut saw = false;
+    let mut all_optional = true;
+    for alt in alts {
+        let Some(optional) = param_optional(alt) else { continue };
+        saw = true;
+        all_optional &= optional;
+    }
+    saw && !all_optional
+}
+
+/// `Some(true)` when `alt` starts with an optional parameter name, `Some(false)` when required.
+fn param_optional(alt: &str) -> Option<bool> {
+    let alt = alt.trim();
+    let name_end = alt.find(|c: char| !c.is_ascii_alphanumeric()).unwrap_or(alt.len());
+    let name = alt.get(..name_end).unwrap_or("");
+    if name.is_empty() || !name.starts_with(|c: char| c.is_ascii_alphabetic()) {
+        return None;
+    }
+    let rest = alt.get(name_end..).unwrap_or("").trim_start();
+    if rest.starts_with('?') {
+        Some(true)
+    } else if rest.is_empty() || rest.starts_with(':') {
+        Some(false)
+    } else {
+        None
+    }
+}
+
 /// Base64 (standard alphabet) for binary payloads in JSON params and results.
 pub fn base64_encode(data: &[u8]) -> String {
     const A: &[u8; 64] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
@@ -373,3 +445,32 @@ pub fn base64_decode(s: &str) -> Option<Vec<u8>> {
     }
     Some(out)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn the_palette_skips_a_command_that_needs_a_value() {
+        assert!(needs_arguments("{path}"));
+        assert!(needs_arguments("{path, format: png|jpeg|pptx, slide?: index}"));
+        assert!(needs_arguments("{path? | data: base64, name?, rect?}"));
+        assert!(needs_arguments("{rows, cols, rect?}"));
+        assert!(needs_arguments("{axis: horizontal|vertical, ids?}"));
+        assert!(needs_arguments("{percent}"));
+        assert!(!needs_arguments("{}"));
+        assert!(!needs_arguments("{on?: bool}"));
+        assert!(!needs_arguments("{theme?: name, size?: [w,h] pt, blank?: bool}"));
+        assert!(!needs_arguments("{uid?: one entry, else all}"));
+        assert!(!needs_arguments("{locked?: bool (default: toggle), ids?}"));
+        assert!(!needs_arguments("{} → [{name, label, category}]"));
+        assert!(!needs_arguments("{title?, subject?} → properties"));
+        assert!(!needs_arguments("{slides?: [index] | \"1-3,5\", includeHidden?}"));
+        let export = command_specs().iter().find(|c| c.id == "file.export").expect("export");
+        let save = command_specs().iter().find(|c| c.id == "file.save").expect("save");
+        let audio = command_specs().iter().find(|c| c.id == "insert.audio").expect("audio");
+        assert!(needs_arguments(export.params));
+        assert!(!needs_arguments(save.params));
+        assert!(needs_arguments(audio.params));
+    }
+}
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..e8ec5a3b 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -85,13 +85,20 @@ pub fn palette(app: &mut SlideApp, ctx: &egui::Context) {
             let r = ui.add(egui::TextEdit::singleline(&mut query).hint_text("Search commands…").desired_width(f32::INFINITY).font(theme::font(15.0)));
             r.request_focus();
             let q = query.to_lowercase();
+            // Commands that need a path or other value fail when the palette runs them with
+            // `{}`. The dialog command (`app.exportDialog`) stays; `file.export` does not.
             let mut items: Vec<(String, String, Option<&'static str>)> = app
                 .session
                 .commands()
                 .into_iter()
-                .filter(|c| c.enabled)
+                .filter(|c| c.enabled && !deckcraft_engine::cmd::needs_arguments(c.params))
                 .map(|c| (c.id.to_string(), c.label.to_string(), c.shortcut))
-                .chain(crate::UI_COMMANDS.iter().map(|c| (c.0.to_string(), c.1.to_string(), c.2)))
+                .chain(
+                    crate::UI_COMMANDS
+                        .iter()
+                        .filter(|c| !deckcraft_engine::cmd::needs_arguments(c.3))
+                        .map(|c| (c.0.to_string(), c.1.to_string(), c.2)),
+                )
                 .filter(|(id, label, _)| q.is_empty() || label.to_lowercase().contains(&q) || id.to_lowercase().contains(&q))
                 .collect();
             items.sort_by_key(|(_, l, _)| !l.to_lowercase().starts_with(&q));
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..f1bafb58 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (command palette no longer offers Export without a path, #79; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -205,7 +205,6 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
 - **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
   Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
-- **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
 
@@ -256,6 +255,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Command palette skips commands that need a value, so Export opens the dialog (#79) |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..0c1be669 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (essentials discount no longer cites the palette Export failure, #79; percentages unchanged; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -150,7 +150,7 @@ mainstream number leaves out.
 | Discount | Factor | Evidence |
 |---|---:|---|
 | Launch and stability | ×0.90 | Some Windows PCs can't start the app (#40, #59), and the workaround is an environment variable; Close loses work (#60) |
-| Discoverability and UI clarity | ×0.95 | Familiar ribbon and tabs; no native menu bar, start-screen glitches, a command palette whose default entry fails (#79) |
+| Discoverability and UI clarity | ×0.95 | Familiar ribbon and tabs; no native menu bar, start-screen glitches |
 | Opening files people send them | ×0.90 | `.pptx` opens, but real decks are untested and EMF pictures and PowerPoint icons can come in blank (#56) |
 
 80.1 × 0.90 × 0.95 × 0.90 = **61.6 → ~62%**.
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Essentials discoverability note: the command palette's Export failure (#79) is fixed; the ×0.95 discount stays for the menu bar and start screen |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..1a187df7 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (command search skips Export without a path, #79; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -21,7 +21,7 @@ AGENTS.md §2). Dimension score: **~60% ready** (estimated), **30–50 h** to pa
 | File tab (Backstage): Home, New, Open, Info, Save, Save As, Print, Share, Export, Close, Account, Options | yes | yes (#76), see [File tab](#file-tab-backstage); no Share (cloud) | Video/GIF/CD exports, templates beyond the built-in themes |
 | Start screen: new, themes, templates, recent, open | yes, the same page as File › Home | yes: File › Home with Home, New, Open, Account and Options (#76) | |
 | Status bar: slide counter, language, notes, comments, views, zoom slider | yes | yes | |
-| Command search (Tell Me) | yes | command palette | #79 default entry fails |
+| Command search (Tell Me) | yes | command palette | |
 | Light / dark appearance | follows the system | light or dark; doesn't follow the system (#41) | 1–2 h |
 | One window per presentation, New Window, Arrange All | yes | tabs in one window; no New Window | 3–5 h |
 | Quick Access Toolbar customization | yes | no | P1 partial |
@@ -138,7 +138,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 | Native macOS menu bar from `menu_tree()`, filled out to PowerPoint's menu items | 3–5 |
 | Format Shape pane depth | 6–10 |
 | Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
-| Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
+| Window chrome and system appearance (#41, #71) | 3–5 |
 | Grid Options, edit points UI, crop depth | 4–7 |
 | Multiple windows | 3–5 |
 | A screenshot comparison pass on the most-used tabs | 2–4 |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Command search no longer offers an Export command that fails without a path (#79) |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 3ed12de91897022be162acd6bd6c88529872e845 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:33:29 +0200
Subject: [PATCH 099/376] Opus: validate the header in Decoder::from_head
 (#425)

---
 crates/opus/src/header.rs      | 17 +++++++++++++++++
 crates/opus/src/multistream.rs | 27 +++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/crates/opus/src/header.rs b/crates/opus/src/header.rs
index 2fe0c752..90423aec 100644
--- a/crates/opus/src/header.rs
+++ b/crates/opus/src/header.rs
@@ -123,6 +123,23 @@ impl OpusHead {
         Ok(OpusHead { channels, pre_skip, input_sample_rate, output_gain, mapping_family: family, streams, coupled_streams: coupled, mapping })
     }
 
+    /// Checks the invariants the decoder indexes by, for headers built by hand rather than parsed.
+    pub fn validate(&self) -> Result<()> {
+        if self.channels == 0 {
+            return Err(Error::InvalidHeader("zero channels"));
+        }
+        if self.streams == 0 || self.coupled_streams > self.streams || self.streams + self.coupled_streams > 255 {
+            return Err(Error::InvalidHeader("bad stream counts"));
+        }
+        if self.mapping.len() != self.channels {
+            return Err(Error::InvalidHeader("channel mapping length differs from channel count"));
+        }
+        if self.mapping.iter().any(|&m| m != 255 && m as usize >= self.streams + self.coupled_streams) {
+            return Err(Error::InvalidHeader("channel mapping out of range"));
+        }
+        Ok(())
+    }
+
     /// Linear output gain factor.
     pub fn gain_linear(&self) -> f32 {
         10f32.powf(self.output_gain as f32 / (20.0 * 256.0))
diff --git a/crates/opus/src/multistream.rs b/crates/opus/src/multistream.rs
index a41ba10c..e3042ca0 100644
--- a/crates/opus/src/multistream.rs
+++ b/crates/opus/src/multistream.rs
@@ -32,6 +32,7 @@ impl Decoder {
 
     /// Creates a decoder for a parsed header at `sample_rate` (8/12/16/24/48 kHz).
     pub fn from_head(head: OpusHead, sample_rate: u32) -> Result<Decoder> {
+        head.validate()?;
         let mut streams = Vec::with_capacity(head.streams);
         for s in 0..head.streams {
             let ch = if s < head.coupled_streams { 2 } else { 1 };
@@ -169,3 +170,29 @@ fn reframe(p: &Packet) -> Vec<u8> {
     }
     v
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn head(channels: usize, streams: usize, coupled: usize, mapping: Vec<u8>) -> OpusHead {
+        OpusHead { channels, pre_skip: 0, input_sample_rate: 48000, output_gain: 0, mapping_family: 1, streams, coupled_streams: coupled, mapping }
+    }
+
+    #[test]
+    fn from_head_rejects_inconsistent_headers() {
+        assert!(Decoder::from_head(head(1, 0, 0, vec![0]), 48000).is_err(), "zero streams");
+        assert!(Decoder::from_head(head(2, 1, 0, vec![0]), 48000).is_err(), "short mapping");
+        assert!(Decoder::from_head(head(1, 1, 0, vec![1]), 48000).is_err(), "mapping index out of range");
+        assert!(Decoder::from_head(head(1, 1, 2, vec![0]), 48000).is_err(), "more coupled than streams");
+        assert!(Decoder::from_head(head(0, 1, 0, vec![]), 48000).is_err(), "zero channels");
+    }
+
+    #[test]
+    fn from_head_accepts_valid_headers() {
+        assert!(Decoder::from_head(head(1, 1, 0, vec![0]), 48000).is_ok());
+        assert!(Decoder::from_head(head(2, 1, 1, vec![0, 1]), 48000).is_ok());
+        assert!(Decoder::from_head(head(3, 2, 1, vec![0, 1, 2]), 48000).is_ok());
+        assert!(Decoder::from_head(head(2, 1, 0, vec![0, 255]), 48000).is_ok());
+    }
+}

From 34372569e7ef3a3f65923154e4c35e16fd658654 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:32:42 +0200
Subject: [PATCH 100/376] xtask: assets audit no longer panics on Unicode names
 and reads real paths from git (#424)

---
 xtask/src/assets.rs | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/xtask/src/assets.rs b/xtask/src/assets.rs
index 36d44622..6b37e557 100644
--- a/xtask/src/assets.rs
+++ b/xtask/src/assets.rs
@@ -67,18 +67,24 @@ fn glob(pat: &str, s: &str) -> bool {
         None => pat == s,
         Some((head, tail)) => {
             let Some(rest) = s.strip_prefix(head) else { return false };
-            (0..=rest.len()).take_while(|&i| i == 0 || !rest[..i].contains('/')).any(|i| rest.is_char_boundary(i) && glob(tail, &rest[i..]))
+            let ends = rest.char_indices().map(|(i, _)| i).chain(std::iter::once(rest.len()));
+            ends.take_while(|&i| !rest[..i].contains('/')).any(|i| glob(tail, &rest[i..]))
         }
     }
 }
 
+/// Splits `git ls-files -z` output into real file names (no display quoting of Unicode or special characters).
+fn parse_ls_files(out: &[u8]) -> Vec<String> {
+    out.split(|&b| b == 0).filter(|n| !n.is_empty()).map(|n| String::from_utf8_lossy(n).into_owned()).collect()
+}
+
 pub fn run(root: &Path) -> Result<(), String> {
     let out = Command::new("git")
         .current_dir(root)
-        .args(["ls-files", "--cached", "--others", "--exclude-standard"])
+        .args(["ls-files", "--cached", "--others", "--exclude-standard", "-z"])
         .output()
         .map_err(|e| format!("git ls-files: {e}"))?;
-    let files: Vec<String> = String::from_utf8_lossy(&out.stdout).lines().filter(|l| root.join(l).exists()).map(str::to_owned).collect();
+    let files: Vec<String> = parse_ls_files(&out.stdout).into_iter().filter(|l| root.join(l).exists()).collect();
     let md = std::fs::read_to_string(root.join("ATTRIBUTION.md")).map_err(|e| format!("ATTRIBUTION.md: {e}"))?;
     let miss = missing(&files, &md);
     if miss.is_empty() {
@@ -104,4 +110,19 @@ mod tests {
         assert!(missing(&["assets/app-icon/hicolor/16x16/apps/x.png".into()], md).is_empty());
         assert_eq!(missing(&["assets/app-icon/hicolor/a/b/apps/x.png".into()], md).len(), 1);
     }
+
+    #[test]
+    fn glob_handles_multibyte_names() {
+        assert!(glob("assets/*/x.png", "assets/żółć/x.png"));
+        assert!(glob("assets/*.png", "assets/日本語.png"));
+        assert!(!glob("assets/*/x.png", "assets/ż/ó/x.png"));
+        assert!(missing(&["assets/żółć/x.png".into()], "`assets/*/x.png`").is_empty());
+        assert_eq!(missing(&["assets/é.png".into()], "`assets/*.svg`"), vec!["assets/é.png".to_string()]);
+    }
+
+    #[test]
+    fn ls_files_output_is_nul_separated_and_unquoted() {
+        let names = parse_ls_files("assets/zażółć.png\0docs/images/a b\nc.png\0".as_bytes());
+        assert_eq!(names, vec!["assets/zażółć.png".to_string(), "docs/images/a b\nc.png".into()]);
+    }
 }

From eff88eaf59f495f8558838f1e7aafef81949acc5 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:33:17 +0200
Subject: [PATCH 101/376] CLI: render-transition refuses --t values that would
 share one file name (#423)

---
 apps/deckcraft-cli/src/main.rs | 55 +++++++++++++++++++++++++++-------
 1 file changed, 45 insertions(+), 10 deletions(-)

diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index fd1d96ea..befd4476 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -200,6 +200,7 @@ fn render_transition(args: &[String]) -> Result<(), String> {
     if ts.is_empty() {
         return Err("render-transition needs --t".into());
     }
+    let paths = frame_paths(&out, &ts)?;
     let mut s = Session::new();
     open(&mut s, Some(&input), false)?;
     let st = s.doc().map_err(|e| e.to_string())?;
@@ -217,27 +218,39 @@ fn render_transition(args: &[String]) -> Result<(), String> {
         (prev.map(|p| render::render_slide(doc, p, &opts)), render::render_slide(doc, i, &opts), parts)
     });
     let aspect = sw / doc.slide_size.height.max(1.0);
-    for t in &ts {
+    for (k, t) in ts.iter().enumerate() {
         let img = match &cached {
             Some((old, new, parts)) => {
                 render::composite_transition(old.as_ref(), new, parts.as_ref(), &render::transition_frame(&tr.kind, &tr.option, *t, aspect))
             }
             None => render::render_transition(doc, i, *t, &opts),
         };
-        let path = if ts.len() == 1 {
-            out.clone()
-        } else {
-            let p = std::path::Path::new(&out);
-            let stem = p.file_stem().and_then(|x| x.to_str()).unwrap_or("frame");
-            let name = format!("{stem}-t{t:.3}.png");
-            p.with_file_name(name).to_string_lossy().into_owned()
-        };
-        std::fs::write(&path, img.to_png()).map_err(|e| format!("{path}: {e}"))?;
+        let path = &paths[k];
+        std::fs::write(path, img.to_png()).map_err(|e| format!("{path}: {e}"))?;
         outln!("{path} ({}×{}) {} {} t={t}", img.width, img.height, tr.kind, tr.option);
     }
     Ok(())
 }
 
+/// Output path of each frame. A single frame goes to OUT; several get `-t<value>` (three decimals)
+/// before the extension. Values that round to the same name would overwrite each other, so that is an error.
+fn frame_paths(out: &str, ts: &[f64]) -> Result<Vec<String>, String> {
+    if ts.len() == 1 {
+        return Ok(vec![out.to_string()]);
+    }
+    let p = std::path::Path::new(out);
+    let stem = p.file_stem().and_then(|x| x.to_str()).unwrap_or("frame");
+    let mut paths: Vec<String> = Vec::with_capacity(ts.len());
+    for t in ts {
+        let path = p.with_file_name(format!("{stem}-t{t:.3}.png")).to_string_lossy().into_owned();
+        if paths.contains(&path) {
+            return Err(format!("--t values round to the same three decimals: more than one frame would be written to {path}"));
+        }
+        paths.push(path);
+    }
+    Ok(paths)
+}
+
 fn convert(args: &[String]) -> Result<(), String> {
     let (Some(input), Some(out)) = (args.first(), args.get(1)) else { return Err("convert needs IN and OUT".into()) };
     let mut s = Session::new();
@@ -355,3 +368,25 @@ fn mcp(args: &[String]) -> Result<(), String> {
     let stdin = std::io::stdin();
     server.serve(stdin.lock(), std::io::stdout()).map_err(|e| e.to_string())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::frame_paths;
+
+    #[test]
+    fn single_frame_uses_out_as_is() {
+        assert_eq!(frame_paths("a/b.png", &[0.5]), Ok(vec!["a/b.png".to_string()]));
+    }
+
+    #[test]
+    fn frames_get_distinct_names() {
+        let paths = frame_paths("f.png", &[0.0, 0.25, 1.0]).unwrap_or_default();
+        assert_eq!(paths, ["f-t0.000.png", "f-t0.250.png", "f-t1.000.png"]);
+    }
+
+    #[test]
+    fn values_rounding_to_one_name_are_rejected() {
+        assert!(frame_paths("f.png", &[0.1001, 0.1002]).is_err());
+        assert!(frame_paths("f.png", &[0.5, 0.5]).is_err());
+    }
+}

From 0b35b74c4d715dd7b257ad3991ead210ac86947d Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 18:35:32 +0300
Subject: [PATCH 102/376] Show: a laser pointer that leaves no ink

Cmd/Ctrl+L and the on-screen button draw the show's laser colour at the pointer. The pen and the laser are not on together, and a click does not advance the slide while the laser is up.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                 |  6 ++--
 crates/ui-egui/src/show.rs | 63 +++++++++++++++++++++++++++++++++++---
 docs/gaps.md               |  5 +--
 docs/parity-checklist.md   |  6 ++--
 docs/slideshow-parity.md   |  9 +++---
 docs/target-app-parity.md  |  4 +--
 6 files changed, 75 insertions(+), 18 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..1bd18b74 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -14,7 +14,7 @@ format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and av
 
 | | Value | Kind |
 |---|---|---|
-| **Feature breadth** | **79%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 36%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
+| **Feature breadth** | **79%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 39%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
 | Menu-bar coverage | 59% of 217 app-specific PowerPoint menu items matched by name (lower bound) | measured: script over the PowerPoint menu dump and the 226 commands |
 | **Ready for real work** | **~55%** | estimated: weighted dimensions below |
 | Mainstream practitioner | ~53% | estimated: weekly-use areas × discounts for interaction (×0.92), stability (×0.92) and `.pptx` exchange (×0.88), [method](docs/target-app-parity.md#mainstream-practitioner-and-essentials-user) |
@@ -76,7 +76,7 @@ EMF/SVG pictures, the data-loss and startup-crash bugs (#60, #40, #59) and the b
 | Media | 67% | ~60% | 8–14 | [file formats](docs/file-format-parity.md) |
 | Transitions | 92% | ~80% | 4–8 | [animation-parity](docs/animation-parity.md) |
 | Animations | 79% | ~65% | 10–16 | [animation-parity](docs/animation-parity.md) |
-| Slide show and presenter view | 66% | ~60% | 10–16 | [slideshow-parity](docs/slideshow-parity.md) |
+| Slide show and presenter view | 68% | ~60% | 10–16 | [slideshow-parity](docs/slideshow-parity.md) |
 | Review | 60% | ~45% | 8–14 | [gaps](docs/gaps.md) |
 | Draw (ink) | 33% | ~30% | 5–9 | [hardware-parity](docs/hardware-parity.md) |
 | Undo and clipboard | 88% | ~75% | 3–5 | [ui-parity](docs/ui-parity.md) |
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Slide show: a laser pointer (Cmd/Ctrl+L, the show's laser colour, no ink). Checklist row Partial; weighted breadth stays 79%, P2 summary 39%, slide show area 68%. The presenter window does not move the dot |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: laser pointer. Headline P2 36% → 39% to match the checklist (the row moves P2 unweighted 38% → 39%; breadth stays 79%) |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..53278496 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -29,6 +29,8 @@ pub struct Show {
     next_tex: Option<(usize, TextureHandle)>,
     blank: Option<Color32>,
     pen: bool,
+    /// A dot that follows the pointer and leaves no ink (`Cmd/Ctrl+L`).
+    laser: bool,
     strokes: Vec<Vec<Pos2>>,
     goto: String,
     started: bool,
@@ -89,6 +91,7 @@ impl Show {
             next_tex: None,
             blank: None,
             pen: false,
+            laser: false,
             strokes: vec![],
             goto: String::new(),
             started: false,
@@ -102,6 +105,27 @@ impl Show {
         }
     }
 
+    /// Pen and laser are different pointers: turning one on puts the other away.
+    fn set_pen(&mut self, on: bool) {
+        self.pen = on;
+        if on {
+            self.laser = false;
+        }
+    }
+
+    fn set_laser(&mut self, on: bool) {
+        self.laser = on;
+        if on {
+            self.pen = false;
+        }
+    }
+
+    /// The arrow pointer: no ink and no laser dot.
+    fn arrow(&mut self) {
+        self.pen = false;
+        self.laser = false;
+    }
+
     fn timeline(&mut self, doc: &Presentation) -> &Timeline {
         let i = self.state.slide;
         if self.timeline.as_ref().is_none_or(|(k, _)| *k != i) {
@@ -301,8 +325,9 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
                 show.ended = false;
                 actions.push(show.state.prev(&doc));
             }
-            P if m.command => show.pen = !show.pen,
-            A if m.command => show.pen = false,
+            P if m.command => show.set_pen(!show.pen),
+            L if m.command => show.set_laser(!show.laser),
+            A if m.command => show.arrow(),
             Home => actions.push(show.state.goto(&doc, 0)),
             End => actions.push(show.state.goto(&doc, doc.slides.len().saturating_sub(1))),
             B | Period => show.blank = if show.blank == Some(Color32::BLACK) { None } else { Some(Color32::BLACK) },
@@ -314,7 +339,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             _ => {}
         }
     }
-    let on_slide = !show.pen && !show.ended && show.blank.is_none() && !show.reading_bar_hit(&ctx);
+    let on_slide = !show.pen && !show.laser && !show.ended && show.blank.is_none() && !show.reading_bar_hit(&ctx);
     let gif_click = if clicked && on_slide { gif_hit(&ctx, ui, &show, &doc, app) } else { None };
     let media_click = if clicked && on_slide && gif_click.is_none() { media_hit(&ctx, ui, &show, &doc) } else { None };
     let link = if on_slide && gif_click.is_none() && media_click.is_none() { link_hit(&ctx, ui, &mut show, &doc) } else { None };
@@ -550,7 +575,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
                 crate::media::paint_frame(&painter, &app.media, *id, r);
             }
             // Play/pause on the animated GIF under the pointer.
-            if let Some(p) = ctx.input(|i| i.pointer.hover_pos()).filter(|_| !show.pen && now - show.last_move < 2.5) {
+            if let Some(p) = ctx.input(|i| i.pointer.hover_pos()).filter(|_| !show.pen && !show.laser && now - show.last_move < 2.5) {
                 for g in &gifs {
                     let r = on_screen(srect, k, &g.rect);
                     if r.contains(p) {
@@ -579,6 +604,8 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             s.push(pos2((p.x - srect.min.x) / srect.width(), (p.y - srect.min.y) / srect.height()));
         }
         ctx.set_cursor_icon(egui::CursorIcon::Crosshair);
+    } else if show.laser {
+        ctx.set_cursor_icon(egui::CursorIcon::None);
     } else if link.is_some() {
         ctx.set_cursor_icon(egui::CursorIcon::PointingHand);
     } else if now - show.last_move > 2.5 && !show.reading {
@@ -590,6 +617,14 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         let pts: Vec<Pos2> = s.iter().map(|q| pos2(srect.min.x + q.x * srect.width(), srect.min.y + q.y * srect.height())).collect();
         painter.add(egui::Shape::line(pts, Stroke::new(3.0, pen_col)));
     }
+    if show.laser
+        && !show.ended
+        && let Some(p) = ctx.input(|i| i.pointer.hover_pos())
+    {
+        let c = theme::to_color32(doc.show.laser_color);
+        painter.circle_filled(p, 16.0, Color32::from_rgba_unmultiplied(c.r(), c.g(), c.b(), 70));
+        painter.circle_filled(p, 5.5, c);
+    }
     // Reading view bar / on-screen controls.
     if show.reading {
         let bar = Rect::from_min_max(pos2(full.min.x, full.max.y - 34.0), full.max);
@@ -636,7 +671,10 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             }
         }
         if b(&mut child, if show.pen { "✏ on" } else { "✏" }).clicked() {
-            show.pen = !show.pen;
+            show.set_pen(!show.pen);
+        }
+        if b(&mut child, if show.laser { "◉ on" } else { "◉" }).clicked() {
+            show.set_laser(!show.laser);
         }
         if b(&mut child, "⬛").clicked() {
             show.blank = Some(Color32::BLACK);
@@ -885,4 +923,19 @@ mod tests {
         assert_eq!(tr.from, Some(0));
         assert!(show.tex.is_none(), "the new slide gets a texture of its own instead of overwriting the old one");
     }
+
+    #[test]
+    fn the_laser_and_the_pen_are_not_on_together() {
+        let doc = deckcraft_model::Presentation::default();
+        let mut show = Show::new(&doc, 0, false, false);
+        show.set_laser(true);
+        assert!(show.laser && !show.pen);
+        show.set_pen(true);
+        assert!(show.pen && !show.laser);
+        show.set_laser(true);
+        show.arrow();
+        assert!(!show.laser && !show.pen);
+        show.set_laser(false);
+        assert!(!show.laser);
+    }
 }
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..52652eb6 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (laser pointer in the slide show; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -184,7 +184,7 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 - **Estimate:** 3–6 h to review, land and round-trip.
 
 ### Smaller missing rows
-Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
+Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), transition
 sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
 matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Laser pointer in the slide show (checklist row Partial). Highlighter, eraser and a laser driven from presenter view remain |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..21a7d585 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -9,7 +9,7 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 13 | 16 | 25 | 39% |
 
 | Area | Parity |
 |---|---|
@@ -29,7 +29,7 @@ The summary between `<!-- SUMMARY -->
 | Media | 67% |
 | Transitions | 92% |
 | Animations | 79% |
-| Slide show | 66% |
+| Slide show | 68% |
 | Review | 60% |
 | Draw | 33% |
 | Undo & clipboard | 88% |
@@ -213,7 +213,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Slide show | Navigation (keys, click, go to slide, blank screen) | P0 | D |
 | Slide show | Presenter view (notes, next slide, timer) | P0 | P |
 | Slide show | Pen and highlighter ink during the show | P1 | P |
-| Slide show | Laser pointer | P2 | M |
+| Slide show | Laser pointer | P2 | P |
 | Slide show | Rehearse timings | P2 | D |
 | Slide show | Custom shows | P2 | D |
 | Slide show | Set up show (loop, kiosk, without animation) | P1 | D |
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index fd981595..4fb087d1 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,11 +1,11 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (laser pointer in the show; the presenter window still does not move it; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
 [animation-parity.md](animation-parity.md); display hardware in
-[hardware-parity.md](hardware-parity.md). Area score: checklist breadth **66%** (measured), **~60%
+[hardware-parity.md](hardware-parity.md). Area score: checklist breadth **68%** (measured), **~60%
 ready** (estimated), **10–16 h** to parity.
 
 ## Running the show
@@ -25,7 +25,7 @@ ready** (estimated), **10–16 h** to parity.
 | See All Slides grid during the show | yes | no | |
 | Zoom into part of a slide during the show | yes | no | |
 | Pen and highlighter ink | yes | pen only (Cmd+P pen, Cmd+A arrow, E erases all ink) | No highlighter, per-stroke eraser, ink colours, or keep/discard annotations prompt |
-| Laser pointer | yes | **no** | 1–2 h |
+| Laser pointer | yes | yes in the show | Cmd/Ctrl+L and the on-screen button draw the show's laser colour and leave no ink. The presenter window does not move that dot |
 | Subtitles and live captions | yes (cloud speech) | no | AI dimension |
 | Custom shows | yes | yes | |
 | Set Up Show: loop until Esc, kiosk (browsed at a kiosk), show without animation/narration, pen colour, slides range | yes | yes, most options | |
@@ -64,7 +64,7 @@ Reading View in a window with navigation: present (checklist row done).
 | Work | Hours |
 |---|---|
 | Presenter view on the right display, swap displays, pause/reset timer, clock, notes size | 3–5 |
-| Laser pointer, highlighter, eraser, keep-annotations prompt | 2–4 |
+| Highlighter, eraser, keep-annotations prompt, laser from presenter view | 2–4 |
 | See All Slides and zoom during the show | 2–3 |
 | Record slide show with narration (no camera) | 5–8 |
 | **Total** | **~12–20** (the slide-show row of the feature table carries 10–16 h; recording overlaps the Media row) |
@@ -73,4 +73,5 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | The show has a laser pointer (Cmd/Ctrl+L, the show's laser colour, no ink). Presenter view still does not drive it |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..6bcf6555 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -11,7 +11,7 @@ number.
 
 | Number | Value | Kind |
 |---|---|---|
-| **Feature breadth** (weighted checklist) | **79%** over 191 features (P0 92%, P1 75%, P2 36%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md), rows re-scored 2026-10-10 |
+| **Feature breadth** (weighted checklist) | **79%** over 191 features (P0 92%, P1 75%, P2 39%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md) |
 | Menu-bar coverage | **59%** (128 of 217 app-specific PowerPoint menu items have a DeckCraft command or UI label of the same name) | **measured** (heuristic lower bound): script matching the 2026-10-07 PowerPoint menu dump against the 226 engine command labels and the UI's strings; excludes the app, Window and Help menus and the subtitle language lists |
 | **Ready for real work** | **~55%** | **estimated**: weighted dimension table below (was ~56% until the features row was recomputed from written area weights) |
 | **Mainstream practitioner** | **~53%** | **estimated**: [method below](#mainstream-practitioner-and-essentials-user) |
@@ -195,7 +195,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Media | 4 | 67% | ~60% | 8–14 | WMA/WMV decode, record audio/screen, icons and 3-D models, playback options lost on PPTX round trip (#74) | [file-format-parity.md](file-format-parity.md) |
 | Transitions | 4 | 92% | ~80% | 4–8 | Transition sounds, 3-D transitions approximated in 2-D | [animation-parity.md](animation-parity.md) |
 | Animations | 6 | 79% | ~65% | 10–16 | 64 of PowerPoint's ~190 effects, Animation Pane timeline, preview, rewind lost on save (#77) | [animation-parity.md](animation-parity.md) |
-| Slide show and presenter view | 8 | 66% | ~60% | 10–16 | Second-display placement, laser pointer, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
+| Slide show and presenter view | 8 | 68% | ~60% | 10–16 | Second-display placement, laser from presenter view, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
 | Review | 3 | 60% | ~45% | 8–14 | Modern comment threads on round trip (#70), compare, version history, real spelling dictionaries | [file-format-parity.md](file-format-parity.md) |
 | Draw (ink) | 2 | 33% | ~30% | 5–9 | Pen pressure, ink to shape/text/math, lasso | [hardware-parity.md](hardware-parity.md) |
 | Undo and clipboard | 3 | 88% | ~75% | 3–5 | Paste Special, image paste (#53) | [ui-parity.md](ui-parity.md) |

From c623b4f5554d108f8fcdbf5fe217b43f450401b3 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:35:58 +0200
Subject: [PATCH 103/376] Matroska: stop following chapter and tag nesting past
 32 levels (#396)

---
 crates/matroska/src/meta.rs | 73 ++++++++++++++++++++++++++++++++++---
 1 file changed, 67 insertions(+), 6 deletions(-)

diff --git a/crates/matroska/src/meta.rs b/crates/matroska/src/meta.rs
index 081759b2..698a2cb5 100644
--- a/crates/matroska/src/meta.rs
+++ b/crates/matroska/src/meta.rs
@@ -241,7 +241,10 @@ pub(crate) fn parse_cues(d: &[u8], out: &mut Vec<CuePoint>) {
     }
 }
 
-fn parse_chapter(d: &[u8]) -> Chapter {
+/// Deepest nesting of `ChapterAtom` / `SimpleTag` we follow. Deeper children are ignored so a hostile file cannot overflow the stack.
+const MAX_NESTING_DEPTH: usize = 32;
+
+fn parse_chapter(d: &[u8], depth: usize) -> Chapter {
     let mut c =
         Chapter { uid: 0, string_uid: None, start_ns: 0, end_ns: None, hidden: false, enabled: true, displays: Vec::new(), children: Vec::new() };
     for e in Children::new(d) {
@@ -268,7 +271,7 @@ fn parse_chapter(d: &[u8]) -> Chapter {
                 }
                 c.displays.push(disp);
             }
-            CHAPTER_ATOM => c.children.push(parse_chapter(e.data)),
+            CHAPTER_ATOM if depth + 1 < MAX_NESTING_DEPTH => c.children.push(parse_chapter(e.data, depth + 1)),
             _ => {}
         }
     }
@@ -284,7 +287,7 @@ pub(crate) fn parse_chapters(d: &[u8], out: &mut Vec<Edition>) {
                 EDITION_FLAG_HIDDEN => edition.hidden = uint(e.data) != 0,
                 EDITION_FLAG_DEFAULT => edition.default = uint(e.data) != 0,
                 EDITION_FLAG_ORDERED => edition.ordered = uint(e.data) != 0,
-                CHAPTER_ATOM => edition.chapters.push(parse_chapter(e.data)),
+                CHAPTER_ATOM => edition.chapters.push(parse_chapter(e.data, 0)),
                 _ => {}
             }
         }
@@ -292,7 +295,7 @@ pub(crate) fn parse_chapters(d: &[u8], out: &mut Vec<Edition>) {
     }
 }
 
-fn parse_simple_tag(d: &[u8]) -> SimpleTag {
+fn parse_simple_tag(d: &[u8], depth: usize) -> SimpleTag {
     let mut t = SimpleTag { name: String::new(), language: "und".into(), default: true, string: None, binary: None, children: Vec::new() };
     for e in Children::new(d) {
         match e.id {
@@ -301,7 +304,7 @@ fn parse_simple_tag(d: &[u8]) -> SimpleTag {
             TAG_DEFAULT => t.default = uint(e.data) != 0,
             TAG_STRING => t.string = Some(string(e.data)),
             TAG_BINARY => t.binary = Some(e.data.to_vec()),
-            SIMPLE_TAG => t.children.push(parse_simple_tag(e.data)),
+            SIMPLE_TAG if depth + 1 < MAX_NESTING_DEPTH => t.children.push(parse_simple_tag(e.data, depth + 1)),
             _ => {}
         }
     }
@@ -326,7 +329,7 @@ pub(crate) fn parse_tags(d: &[u8], out: &mut Vec<Tag>) {
                         }
                     }
                 }
-                SIMPLE_TAG => tag.simple.push(parse_simple_tag(e.data)),
+                SIMPLE_TAG => tag.simple.push(parse_simple_tag(e.data, 0)),
                 _ => {}
             }
         }
@@ -549,3 +552,61 @@ pub(crate) fn parse_tracks(d: &[u8], timestamp_scale: u64) -> Vec<Track> {
     }
     out
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::ebml::{write_id, write_size};
+
+    /// `levels` elements with id `id`, each holding the next; the innermost is empty.
+    fn nested(id: u32, levels: usize) -> Vec<u8> {
+        let mut inner = Vec::new();
+        for _ in 0..levels {
+            let mut e = Vec::new();
+            write_id(&mut e, id);
+            write_size(&mut e, inner.len() as u64, 1);
+            e.extend_from_slice(&inner);
+            inner = e;
+        }
+        inner
+    }
+
+    fn chapter_depth(c: &Chapter) -> usize {
+        1 + c.children.iter().map(chapter_depth).max().unwrap_or(0)
+    }
+
+    fn tag_depth(t: &SimpleTag) -> usize {
+        1 + t.children.iter().map(tag_depth).max().unwrap_or(0)
+    }
+
+    fn chapters_of(levels: usize) -> usize {
+        let mut edition = Vec::new();
+        write_id(&mut edition, EDITION_ENTRY);
+        let atoms = nested(CHAPTER_ATOM, levels);
+        write_size(&mut edition, atoms.len() as u64, 1);
+        edition.extend_from_slice(&atoms);
+        let mut out = Vec::new();
+        parse_chapters(&edition, &mut out);
+        chapter_depth(&out[0].chapters[0])
+    }
+
+    #[test]
+    fn chapter_nesting_is_bounded() {
+        assert_eq!(chapters_of(MAX_NESTING_DEPTH), MAX_NESTING_DEPTH);
+        assert_eq!(chapters_of(MAX_NESTING_DEPTH + 50), MAX_NESTING_DEPTH);
+    }
+
+    #[test]
+    fn simple_tag_nesting_is_bounded() {
+        for (levels, expected) in [(MAX_NESTING_DEPTH, MAX_NESTING_DEPTH), (MAX_NESTING_DEPTH + 50, MAX_NESTING_DEPTH)] {
+            let mut tag = Vec::new();
+            write_id(&mut tag, TAG);
+            let simple = nested(SIMPLE_TAG, levels);
+            write_size(&mut tag, simple.len() as u64, 1);
+            tag.extend_from_slice(&simple);
+            let mut out = Vec::new();
+            parse_tags(&tag, &mut out);
+            assert_eq!(tag_depth(&out[0].simple[0]), expected);
+        }
+    }
+}

From efb2127e4e7cc63c20c0cdfc8cf70452bc565842 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:33:29 +0200
Subject: [PATCH 104/376] Format scientific number formats (0.00E+00) in chart
 labels (#419)

---
 crates/model/src/numfmt.rs | 111 +++++++++++++++++++++++++++++++++----
 1 file changed, 99 insertions(+), 12 deletions(-)

diff --git a/crates/model/src/numfmt.rs b/crates/model/src/numfmt.rs
index d6f613dd..c3cf1713 100644
--- a/crates/model/src/numfmt.rs
+++ b/crates/model/src/numfmt.rs
@@ -162,6 +162,86 @@ pub fn format(code: &str, v: f64, lang: Option<&str>) -> String {
         let s: String = toks.iter().filter_map(|t| if let Tok::Lit(s) = t { Some(s.as_str()) } else { None }).collect();
         return s.trim().to_string();
     };
+    let out = sci(&toks, v, sep, dec).unwrap_or_else(|| fixed(&toks, first, last, v, sep, dec));
+    let out = out.trim();
+    if minus && !out.is_empty() { format!("-{out}") } else { out.to_string() }
+}
+
+/// The text of the literal and percent tokens in `ts`.
+fn lits(ts: &[Tok]) -> String {
+    ts.iter()
+        .filter_map(|t| match t {
+            Tok::Lit(s) => Some(s.clone()),
+            Tok::Percent => Some("%".into()),
+            _ => None,
+        })
+        .collect()
+}
+
+/// Scientific notation (`0.00E+00`, `##0.0E-0`): the mantissa takes the placeholders before the `E`,
+/// the exponent's sign and minimum width come from what follows it; with several integer
+/// placeholders the exponent is a multiple of their count (engineering notation). `None` if the
+/// section has no exponent part.
+fn sci(toks: &[Tok], v: f64, sep: char, dec: char) -> Option<String> {
+    let e = toks.iter().position(|t| matches!(t, Tok::Lit(s) if s.as_str() == "E" || s.as_str() == "e"))?;
+    let e_char = if let Some(Tok::Lit(s)) = toks.get(e) { s.as_str() } else { "E" };
+    let plus = match toks.get(e + 1)? {
+        Tok::Lit(s) if s.as_str() == "+" => true,
+        Tok::Lit(s) if s.as_str() == "-" => false,
+        _ => return None,
+    };
+    let mant = toks.get(..e)?;
+    let mfirst = mant.iter().position(|t| matches!(t, Tok::Digit(_)))?;
+    let mlast = mant.iter().rposition(|t| matches!(t, Tok::Digit(_)))?;
+    let exp_toks = toks.get(e + 2..)?;
+    let exp_len = exp_toks.iter().take_while(|t| matches!(t, Tok::Digit(_))).count();
+    if exp_len == 0 {
+        return None;
+    }
+    let width = exp_toks.iter().take(exp_len).filter(|t| **t == Tok::Digit('0')).count();
+    let rest = exp_toks.get(exp_len..).unwrap_or(&[]);
+    let mant_frac = mant.iter().skip_while(|t| **t != Tok::Dot).filter(|t| matches!(t, Tok::Digit(_))).count();
+    let (mut m, mut exp) = (0.0, 0i32);
+    if v != 0.0 {
+        exp = v.log10().floor() as i32;
+        m = v / 10f64.powi(exp);
+        if !m.is_finite() {
+            m = 0.0;
+            exp = 0;
+        }
+        if m >= 10.0 {
+            m /= 10.0;
+            exp += 1;
+        } else if m < 1.0 {
+            m *= 10.0;
+            exp -= 1;
+        }
+        // Rounding the mantissa to its digits can reach 10 (9.999 as `0.00`).
+        if format!("{m:.mant_frac$}").starts_with("10") {
+            m /= 10.0;
+            exp += 1;
+        }
+    }
+    let step = mant.iter().take_while(|t| **t != Tok::Dot).filter(|t| matches!(t, Tok::Digit(_))).count().max(1) as i32;
+    let shift = exp.rem_euclid(step);
+    exp -= shift;
+    m *= 10f64.powi(shift);
+    let mantissa = fixed(mant, mfirst, mlast, m, sep, dec);
+    let sign = if exp < 0 {
+        "-"
+    } else if plus {
+        "+"
+    } else {
+        ""
+    };
+    let digits = exp.unsigned_abs().to_string();
+    let pad = "0".repeat(width.saturating_sub(digits.len()));
+    Some(format!("{mantissa}{e_char}{sign}{pad}{digits}{}", lits(rest)))
+}
+
+/// `v` (not negative) in the fixed-point format whose tokens are `toks`, with its digits from
+/// `first` to `last`.
+fn fixed(toks: &[Tok], first: usize, last: usize, v: f64, sep: char, dec: char) -> String {
     let percent = toks.contains(&Tok::Percent);
     let number = toks.get(first..=last).unwrap_or(&[]);
     let dot = number.iter().position(|t| *t == Tok::Dot);
@@ -195,20 +275,9 @@ pub fn format(code: &str, v: f64, lang: Option<&str>) -> String {
         num.push(dec);
         num.push_str(&fp);
     }
-    let lits = |ts: &[Tok]| -> String {
-        ts.iter()
-            .filter_map(|t| match t {
-                Tok::Lit(s) => Some(s.clone()),
-                Tok::Percent => Some("%".into()),
-                _ => None,
-            })
-            .collect()
-    };
     let before = lits(toks.get(..first).unwrap_or(&[]));
     let after = lits(toks.get(last + 1..).unwrap_or(&[]));
-    let out = format!("{before}{num}{after}");
-    let out = out.trim();
-    if minus && !out.is_empty() { format!("-{out}") } else { out.to_string() }
+    format!("{before}{num}{after}")
 }
 
 #[cfg(test)]
@@ -245,6 +314,24 @@ mod tests {
         assert_eq!(format("\"x\"0", 5.0, None), "x5");
     }
 
+    #[test]
+    fn scientific_formats() {
+        assert_eq!(format("0.00E+00", 1234.0, None), "1.23E+03");
+        assert_eq!(format("0.00E+00", 1234.0, Some("ru-RU")), "1,23E+03");
+        assert_eq!(format("0.00E+00", 0.00012, None), "1.20E-04");
+        assert_eq!(format("0.00E+00", -1234.0, None), "-1.23E+03");
+        assert_eq!(format("0.00E+00", 0.0, None), "0.00E+00");
+        assert_eq!(format("0.0E+000", 5e10, None), "5.0E+010");
+        assert_eq!(format("0.0E-0", 1234.0, None), "1.2E3");
+        assert_eq!(format("0.0E-0", 0.0012, None), "1.2E-3");
+        assert_eq!(format("0E+00", 9999.0, None), "1E+04");
+        assert_eq!(format("0.00E+00", 9.999, None), "1.00E+01");
+        assert_eq!(format("0.00e+00", 1234.0, None), "1.23e+03");
+        assert_eq!(format("##0.0E+0", 12_345.0, None), "12.3E+3");
+        assert_eq!(format("##0.0E+0", 0.012, None), "12.0E-3");
+        assert_eq!(format("##0.0E+0", 999.96, None), "1.0E+3");
+    }
+
     #[test]
     fn never_panics() {
         for code in ["", ";", ";;;", "\"", "[", "\\", "0.", ".", "#,", "%", "_", "*", "@", "0E+00", "[$", "\"unterminated"] {

From 9aebc8ba51649314c623bca2f5bc971b2049b6da Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:35:47 +0200
Subject: [PATCH 105/376] AV1: reject tile groups that repeat, skip or reorder
 tiles (#395)

---
 crates/av1/src/decoder.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/crates/av1/src/decoder.rs b/crates/av1/src/decoder.rs
index 66c96698..6a52902a 100644
--- a/crates/av1/src/decoder.rs
+++ b/crates/av1/src/decoder.rs
@@ -555,6 +555,7 @@ impl Decoder {
         if tg_end >= num_tiles || tg_start > tg_end {
             return Err(Error::Invalid("tile group range"));
         }
+        check_tile_group_start(job.tiles.len(), tg_start)?;
         let mut pos = r.byte_pos();
         for tile_num in tg_start..=tg_end {
             let size = if tile_num == tg_end {
@@ -947,3 +948,26 @@ fn project(fs: &mut FrameState, src: usize, dst_sign: i32) -> bool {
     }
     true
 }
+
+/// Tile groups must arrive in order with no gaps and no overlap: each one starts at the tile
+/// after the last one received (`tg_start` semantics, 6.10.1).
+fn check_tile_group_start(received: usize, tg_start: usize) -> Result<()> {
+    if tg_start == received { Ok(()) } else { Err(Error::Invalid("tile group out of order")) }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::check_tile_group_start;
+
+    #[test]
+    fn tile_groups_must_be_contiguous() {
+        assert!(check_tile_group_start(0, 0).is_ok());
+        assert!(check_tile_group_start(2, 2).is_ok());
+        // duplicate coverage
+        assert!(check_tile_group_start(2, 0).is_err());
+        assert!(check_tile_group_start(2, 1).is_err());
+        // skipped tiles
+        assert!(check_tile_group_start(0, 1).is_err());
+        assert!(check_tile_group_start(2, 3).is_err());
+    }
+}

From a4a7ebe65869f7022a3710ba5a52929d7377f7df Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:35:44 +0200
Subject: [PATCH 106/376] Bitstream: reject bad NAL length widths, check NAL
 endpoints and signed Exp-Golomb limits (#397)

---
 crates/bitstream/src/lib.rs | 57 +++++++++++++++++++++++++++++++------
 1 file changed, 49 insertions(+), 8 deletions(-)

diff --git a/crates/bitstream/src/lib.rs b/crates/bitstream/src/lib.rs
index 48884673..46a1f777 100644
--- a/crates/bitstream/src/lib.rs
+++ b/crates/bitstream/src/lib.rs
@@ -15,6 +15,8 @@ pub enum BitError {
     Eof,
     /// An Exp-Golomb code longer than 32 leading zeros.
     InvalidExpGolomb,
+    /// A NAL length prefix width outside 1..=4 bytes.
+    InvalidLengthSize,
 }
 
 impl fmt::Display for BitError {
@@ -22,6 +24,7 @@ impl fmt::Display for BitError {
         match self {
             BitError::Eof => f.write_str("unexpected end of bitstream"),
             BitError::InvalidExpGolomb => f.write_str("invalid Exp-Golomb code"),
+            BitError::InvalidLengthSize => f.write_str("unsupported NAL length prefix size"),
         }
     }
 }
@@ -140,10 +143,11 @@ impl<'a> BitReader<'a> {
         self.read_ue()?.checked_add(add).ok_or(BitError::InvalidExpGolomb)
     }
 
-    /// Signed Exp-Golomb `se(v)`.
+    /// Signed Exp-Golomb `se(v)`. Codes whose value does not fit an `i32` (the code for `2^31`) are rejected.
     pub fn read_se(&mut self) -> Result<i32> {
         let k = self.read_ue()? as i64;
-        Ok(if k & 1 == 1 { ((k + 1) / 2) as i32 } else { -((k / 2) as i32) })
+        let v = if k & 1 == 1 { (k + 1) / 2 } else { -(k / 2) };
+        i32::try_from(v).map_err(|_| BitError::InvalidExpGolomb)
     }
 
     /// Truncated Exp-Golomb `te(v)` with range `max`.
@@ -202,7 +206,10 @@ impl BitWriter {
         self.write_bits(b as u32, 1);
     }
     pub fn write_ue(&mut self, v: u32) {
-        let x = v as u64 + 1;
+        self.write_ue_u64(v as u64);
+    }
+    fn write_ue_u64(&mut self, v: u64) {
+        let x = v + 1;
         let len = 64 - x.leading_zeros();
         let zeros = len - 1;
         for _ in 0..zeros {
@@ -215,9 +222,11 @@ impl BitWriter {
             self.write_bits(x as u32, len);
         }
     }
+    /// Signed Exp-Golomb `se(v)`. `i32::MIN` needs a code above `u32::MAX`, which `read_se` rejects.
     pub fn write_se(&mut self, v: i32) {
-        let k = if v > 0 { (v as u32) * 2 - 1 } else { (-(v as i64) as u32) * 2 };
-        self.write_ue(k);
+        let v = v as i64;
+        let k = if v > 0 { (v as u64) * 2 - 1 } else { ((-v) as u64) * 2 };
+        self.write_ue_u64(k);
     }
     pub fn bit_len(&self) -> usize {
         self.buf.len() * 8 + self.nbits as usize
@@ -310,12 +319,15 @@ pub fn annexb_nals(data: &[u8]) -> Vec<&[u8]> {
     out
 }
 
-/// Split a length-prefixed sample (AVCC/HVCC, `length_size` 1/2/4 bytes) into NAL units.
+/// Split a length-prefixed sample (AVCC/HVCC, `length_size` 1..=4 bytes, as the 2-bit `lengthSizeMinusOne` allows) into NAL units.
 pub fn length_prefixed_nals(data: &[u8], length_size: usize) -> Result<Vec<&[u8]>> {
+    if !(1..=4).contains(&length_size) {
+        return Err(BitError::InvalidLengthSize);
+    }
     let mut out = Vec::new();
     let mut i = 0;
     while i < data.len() {
-        if i + length_size > data.len() {
+        if length_size > data.len() - i {
             return Err(BitError::Eof);
         }
         let mut len = 0usize;
@@ -323,7 +335,7 @@ pub fn length_prefixed_nals(data: &[u8], length_size: usize) -> Result<Vec<&[u8]
             len = (len << 8) | data[i + k] as usize;
         }
         i += length_size;
-        if i + len > data.len() {
+        if len > data.len() - i {
             return Err(BitError::Eof);
         }
         out.push(&data[i..i + len]);
@@ -361,6 +373,35 @@ mod tests {
         assert!(r.read_ue_plus(1).is_err());
     }
 
+    #[test]
+    fn signed_exp_golomb_extremes() {
+        let mut w = BitWriter::new();
+        for v in [i32::MAX, i32::MIN + 1, i32::MIN] {
+            w.write_se(v);
+        }
+        w.rbsp_trailing();
+        let b = w.finish();
+        let mut r = BitReader::new(&b);
+        assert_eq!(r.read_se().unwrap(), i32::MAX);
+        assert_eq!(r.read_se().unwrap(), i32::MIN + 1);
+        assert_eq!(r.read_se(), Err(BitError::InvalidExpGolomb));
+        // ue code 0xFFFF_FFFF maps to +2^31, which must not wrap to a negative i32.
+        let mut w = BitWriter::new();
+        w.write_ue(u32::MAX);
+        w.rbsp_trailing();
+        let b = w.finish();
+        assert_eq!(BitReader::new(&b).read_se(), Err(BitError::InvalidExpGolomb));
+    }
+
+    #[test]
+    fn length_prefixed_rejects_bad_width_and_oversized_length() {
+        assert_eq!(length_prefixed_nals(&[1, 2, 3, 4, 5, 6], 5), Err(BitError::InvalidLengthSize));
+        assert_eq!(length_prefixed_nals(&[1, 2, 3], 0), Err(BitError::InvalidLengthSize));
+        assert_eq!(length_prefixed_nals(&[0, 0, 1, 7], 3).unwrap(), vec![&[7u8][..]]);
+        assert_eq!(length_prefixed_nals(&[0xFF, 0xFF, 0xFF, 0xFF, 1], 4), Err(BitError::Eof));
+        assert_eq!(length_prefixed_nals(&[0, 0, 0, 1, 9], 4).unwrap(), vec![&[9u8][..]]);
+    }
+
     #[test]
     fn reads_bits() {
         let d = [0b1010_1100, 0b0101_0011];

From 863f7cbd879398770398cda3f732e0b95b4a2ead Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:34:22 +0200
Subject: [PATCH 107/376] Engine: moving the selection to another text body
 settles the composition (#421)

---
 crates/engine/src/lib.rs        |  6 ++++++
 crates/engine/src/tests_keys.rs | 35 +++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..981fcf16 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -509,9 +509,15 @@ impl Session {
         if let Some(t) = st.selection.text.as_mut() {
             t.line_end = None;
         }
+        let owner = |sel: &Selection| sel.text.as_ref().map(|t| (sel.slide, sel.target, t.shape, t.cell, t.notes));
+        let before = owner(&st.selection);
         f(&doc, &mut st.selection);
         clamp_selection(st);
         st.revision += 1;
+        // A composition belongs to the text body it began in: leaving that body settles it.
+        if st.composition.is_some() && owner(&st.selection) != before {
+            self.end_composition();
+        }
         Ok(())
     }
 }
diff --git a/crates/engine/src/tests_keys.rs b/crates/engine/src/tests_keys.rs
index 926c4289..19a91ae8 100644
--- a/crates/engine/src/tests_keys.rs
+++ b/crates/engine/src/tests_keys.rs
@@ -402,3 +402,38 @@ fn keys_never_panic_on_any_text() {
         }
     }
 }
+
+#[test]
+fn select_into_another_body_settles_the_composition() {
+    let (mut s, a) = editing("hello", (0, 0));
+    s.execute("insert.textBox", &json!({"rect": [60.0, 400.0, 600.0, 100.0], "text": "x"})).unwrap();
+    let b = s.doc().unwrap().selection.shapes[0].0;
+    s.execute("text.set", &json!({"id": b, "text": "0123456789"})).unwrap();
+    s.execute("text.edit", &json!({"id": a, "at": [0, 0]})).unwrap();
+    s.compose_text("ab", None).unwrap();
+    s.select(|_, sel| {
+        sel.text = Some(crate::TextSel { shape: deckcraft_model::ShapeId(b), ..Default::default() });
+    })
+    .unwrap();
+    assert!(s.doc().unwrap().composition.is_none());
+    s.commit_text("X").unwrap();
+    assert_eq!(text(&mut s, b), "X0123456789");
+    assert_eq!(text(&mut s, a), "abhello");
+}
+
+#[test]
+fn select_into_another_table_cell_settles_the_composition() {
+    let (mut s, _) = editing("x", (0, 0));
+    let data = json!([["hello", "0123456789"]]);
+    let r = s.execute("insert.table", &json!({"rows": 1, "cols": 2, "rect": [60.0, 400.0, 600.0, 60.0], "data": data})).unwrap();
+    let id = deckcraft_model::ShapeId(r["id"].as_u64().unwrap() as u32);
+    s.select(|_, sel| sel.text = Some(crate::TextSel { shape: id, cell: Some((0, 0)), ..Default::default() })).unwrap();
+    s.compose_text("ab", None).unwrap();
+    s.select(|_, sel| sel.text = Some(crate::TextSel { shape: id, cell: Some((0, 1)), ..Default::default() })).unwrap();
+    assert!(s.doc().unwrap().composition.is_none());
+    s.commit_text("X").unwrap();
+    let st = s.doc().unwrap();
+    let Some(deckcraft_model::ShapeKind::Table(t)) = st.shape(id).map(|sh| &sh.kind) else { panic!("not a table") };
+    let cell = |c| t.cell(0, c).map(|x| x.text.text()).unwrap_or_default();
+    assert_eq!((cell(0), cell(1)), ("abhello".to_string(), "X0123456789".to_string()));
+}

From 27d73db0d9e097fef83771723cc611f6004e0cd6 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:35:59 +0200
Subject: [PATCH 108/376] Engine: a command that fails after editing puts the
 presentation back (#405)

---
 crates/engine/src/guard.rs | 28 ++++++++++++++++++++++++++++
 crates/engine/src/lib.rs   | 18 +++++++++++++++++-
 2 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/guard.rs b/crates/engine/src/guard.rs
index 2a633ca6..870350c8 100644
--- a/crates/engine/src/guard.rs
+++ b/crates/engine/src/guard.rs
@@ -88,4 +88,32 @@ mod tests {
         // The session keeps working.
         s.execute("shape.insert", &json!({"preset": "ellipse", "rect": [36, 236, 200, 400]})).unwrap();
     }
+
+    #[test]
+    fn a_command_that_fails_after_editing_leaves_the_document_alone() {
+        let mut s = Session::new();
+        s.execute("file.new", &json!({})).unwrap();
+        let a = s.execute("shape.insert", &json!({"preset": "rect", "rect": [36, 36, 100, 100]})).unwrap()["id"].as_u64().unwrap();
+        let b = s.execute("shape.insert", &json!({"preset": "rect", "rect": [236, 36, 100, 100]})).unwrap()["id"].as_u64().unwrap();
+        let before = s.active().unwrap().doc.clone();
+        let undo_len = s.active().unwrap().history.undo.len();
+        // `shape.connect` inserts the requested preset first, then rejects it because it is not a line.
+        let r = s.execute("shape.connect", &json!({"from": a, "to": b, "preset": "rect"}));
+        assert!(r.is_err());
+        let st = s.active().unwrap();
+        assert!(std::sync::Arc::ptr_eq(&st.doc, &before), "the stray shape is gone");
+        assert_eq!(st.history.undo.len(), undo_len);
+    }
+
+    #[test]
+    fn a_failed_picture_change_adds_no_media() {
+        let mut s = Session::new();
+        s.execute("file.new", &json!({})).unwrap();
+        s.execute("shape.insert", &json!({"preset": "rect", "rect": [36, 36, 100, 100]})).unwrap();
+        let before = s.active().unwrap().doc.clone();
+        // `picture.change` stores the image first, then finds no shape with this id.
+        let r = s.execute("picture.change", &json!({"ids": [9999], "name": "a.png", "data": crate::cmd::base64_encode(b"not a picture")}));
+        assert!(r.is_err());
+        assert!(std::sync::Arc::ptr_eq(&s.active().unwrap().doc, &before), "the stored image is gone");
+    }
 }
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..8c36da11 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -452,7 +452,23 @@ impl Session {
         self.depth += 1;
         let r = (spec.run)(self, params);
         self.depth -= 1;
-        let r = r?;
+        let r = match r {
+            Ok(r) => r,
+            Err(e) => {
+                // A command made of several edits can fail after some of them went through; the
+                // outermost one puts the presentation back, so a failed command changes nothing.
+                if outer
+                    && let (Some((uid, old, sel)), Some(st)) = (before, self.active_mut())
+                    && st.uid == uid
+                    && !Arc::ptr_eq(&old, &st.doc)
+                {
+                    st.doc = old;
+                    st.selection = sel;
+                    st.revision += 1;
+                }
+                return Err(e);
+            }
+        };
         if let Some(st) = self.active_mut() {
             clamp_selection(st);
         }

From 45b8dce220afd86f688fb2d184a29880e0acc162 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:33:35 +0200
Subject: [PATCH 109/376] Info: keep a property draft when another field or the
 side menu is clicked (#422)

---
 crates/ui-egui/src/backstage.rs       | 29 +++++++++++++++++---
 crates/ui-egui/src/backstage_tests.rs | 38 +++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 4 deletions(-)

diff --git a/crates/ui-egui/src/backstage.rs b/crates/ui-egui/src/backstage.rs
index f1d0fde3..2d2dba2a 100644
--- a/crates/ui-egui/src/backstage.rs
+++ b/crates/ui-egui/src/backstage.rs
@@ -353,6 +353,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
             }
             if nav_item(ui, *nav, &bs, index, &t).clicked() {
                 bs.focus = None;
+                commit_props(app, &bs);
                 match act(app, *nav, bs.page) {
                     None => out.close = true,
                     Some(p) => out.page = Some(p),
@@ -367,6 +368,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
             for (k, nav) in bottom.iter().enumerate().rev() {
                 if nav_item(ui, *nav, &bs, first_bottom + k, &t).clicked() {
                     bs.focus = None;
+                    commit_props(app, &bs);
                     match act(app, *nav, bs.page) {
                         None => out.close = true,
                         Some(p) => out.page = Some(p),
@@ -796,15 +798,16 @@ fn info(app: &mut SlideApp, ui: &mut Ui, bs: &mut Backstage) {
                     let Some(draft) = bs.props.get_mut(i) else { continue };
                     let l = ui.label(RichText::new(*label).color(t.text_dim));
                     let id = ui.make_persistent_id(("backstage_prop", *key));
-                    // Show the presentation's value unless the field is being edited (undo…).
-                    if !ui.ctx().memory(|m| m.has_focus(id)) {
-                        draft.clone_from(&saved);
-                    }
                     let resp = ui.add(egui::TextEdit::singleline(draft).id(id).hint_text(*hint).desired_width(300.0)).labelled_by(l.id);
                     if resp.lost_focus() && *draft != saved {
+                        // Commit first: a click on another field takes the focus before this one is drawn.
                         let mut p = serde_json::Map::new();
                         p.insert((*key).to_string(), json!(draft.clone()));
                         let _ = app.run("file.properties", Value::Object(p));
+                    } else if !resp.has_focus() && *draft != saved {
+                        // Show the presentation's value unless the field is being edited (undo...).
+                        draft.clone_from(&saved);
+                        ui.ctx().request_repaint();
                     }
                     ui.end_row();
                 }
@@ -814,6 +817,24 @@ fn info(app: &mut SlideApp, ui: &mut Ui, bs: &mut Backstage) {
     });
 }
 
+/// Commits what the Info page's property fields hold and the presentation does not: a side-menu
+/// action such as Save runs before the field that is being left is drawn again (#422).
+fn commit_props(app: &mut SlideApp, bs: &Backstage) {
+    if bs.page != Page::Info {
+        return;
+    }
+    let Ok(v) = app.session.execute("file.info", &json!({})) else { return };
+    let mut p = serde_json::Map::new();
+    for ((key, _, _), draft) in PROPERTIES.iter().zip(&bs.props) {
+        if v["properties"].get(*key).and_then(Value::as_str).unwrap_or("") != *draft {
+            p.insert((*key).to_string(), json!(draft));
+        }
+    }
+    if !p.is_empty() {
+        let _ = app.run("file.properties", Value::Object(p));
+    }
+}
+
 /// `1234567` → `1.2 MB`.
 pub fn format_bytes(b: u64) -> String {
     match b {
diff --git a/crates/ui-egui/src/backstage_tests.rs b/crates/ui-egui/src/backstage_tests.rs
index 115d782f..55871074 100644
--- a/crates/ui-egui/src/backstage_tests.rs
+++ b/crates/ui-egui/src/backstage_tests.rs
@@ -347,6 +347,44 @@ fn info_shows_and_edits_the_properties() {
     assert!(h.state().backstage_open());
 }
 
+/// Leaving a property field with a click on another field keeps what was typed.
+#[test]
+fn info_keeps_a_property_draft_when_another_field_is_clicked() {
+    let mut h = harness(new_app());
+    h.state_mut().run("app.backstage", json!({"page": "info"})).unwrap();
+    h.run_steps(3);
+    h.get_by_role_and_label(Role::TextInput, "Author").click();
+    h.run_steps(2);
+    h.get_by_role_and_label(Role::TextInput, "Author").type_text("Ada");
+    h.run_steps(2);
+    h.get_by_role_and_label(Role::TextInput, "Title").click();
+    h.run_steps(4);
+    assert_eq!(h.state().session.active().unwrap().doc.props.author, "Ada");
+}
+
+/// Save straight from a property field saves what was typed (the side menu acts before the field
+/// is drawn again).
+#[test]
+fn info_saves_a_property_draft_when_save_is_clicked() {
+    let dir = temp_dir("info-save");
+    let path = dir.join("Draft.pptx").to_string_lossy().to_string();
+    let mut s = Session::with_new();
+    s.execute("file.saveAs", &json!({"path": path})).unwrap();
+    let mut h = harness(SlideApp::new(s, Services::default()));
+    h.state_mut().run("app.backstage", json!({"page": "info"})).unwrap();
+    h.run_steps(3);
+    h.get_by_role_and_label(Role::TextInput, "Author").click();
+    h.run_steps(2);
+    h.get_by_role_and_label(Role::TextInput, "Author").type_text("Ada");
+    h.run_steps(2);
+    click_nav(&h, "Save");
+    h.run_steps(3);
+    let doc = h.state().session.active().unwrap();
+    assert_eq!(doc.doc.props.author, "Ada");
+    assert!(!doc.is_dirty(), "the author went into the saved file");
+    let _ = std::fs::remove_dir_all(&dir);
+}
+
 /// With nothing open the File tab is the start screen: Home, New and Open, no back arrow, and Esc
 /// has nowhere to go.
 #[test]

From 33ade6368729f3ef0a903ffee08d76bcb8953a64 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:36:07 +0200
Subject: [PATCH 110/376] Table: split and cell fill stay inside the table
 (#400)

---
 crates/engine/src/cmd/table.rs |  6 +++++-
 crates/engine/src/tests.rs     | 14 ++++++++++++++
 crates/model/src/table.rs      | 16 ++++++++++++++--
 3 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index e9f6f164..780c0053 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -205,7 +205,11 @@ fn cell_fill(s: &mut Session, p: &Value) -> Result<Value> {
     with_table(s, p, "table.cellFill", move |t| {
         let list: Vec<(usize, usize)> = match (&cells, sel) {
             (Some(c), _) => c.clone(),
-            (None, Some((_, a, b))) => (a.0.min(b.0)..=a.0.max(b.0)).flat_map(|r| (a.1.min(b.1)..=a.1.max(b.1)).map(move |c| (r, c))).collect(),
+            (None, Some((_, a, b))) => {
+                // The selection can name cells outside the table; only walk the ones that exist.
+                let (r1, c1) = (a.0.max(b.0).min(t.n_rows().saturating_sub(1)), a.1.max(b.1).min(t.n_cols().saturating_sub(1)));
+                (a.0.min(b.0)..=r1).flat_map(|r| (a.1.min(b.1)..=c1).map(move |c| (r, c))).collect()
+            }
             _ => (0..t.n_rows()).flat_map(|r| (0..t.n_cols()).map(move |c| (r, c))).collect(),
         };
         for (r, c) in list {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..8f0c3136 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,17 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn cell_fill_walks_only_the_cells_a_huge_selection_covers() {
+    // A selection may reach far past the table; filling it touches the real cells and nothing more.
+    let mut s = session();
+    let id = s.execute("insert.table", &json!({"rows": 2, "cols": 2, "rect": [100.0, 100.0, 200.0, 40.0]})).unwrap()["id"].clone();
+    s.execute("table.selectCells", &json!({"id": id, "from": [1, 1], "to": [1_000_000_000u64, 1_000_000_000u64]})).unwrap();
+    s.execute("table.cellFill", &json!({"none": true})).unwrap();
+    let st = s.doc().unwrap();
+    let sh = st.shapes().iter().find(|sh| json!(sh.id) == id).unwrap();
+    let deckcraft_model::ShapeKind::Table(t) = &sh.kind else { panic!("not a table") };
+    let fills: Vec<bool> = [(0, 0), (0, 1), (1, 0), (1, 1)].iter().map(|&(r, c)| t.cell(r, c).is_some_and(|x| x.fill.is_some())).collect();
+    assert_eq!(fills, [false, false, false, true]);
+}
diff --git a/crates/model/src/table.rs b/crates/model/src/table.rs
index 2dd46e3b..91555894 100644
--- a/crates/model/src/table.rs
+++ b/crates/model/src/table.rs
@@ -178,8 +178,9 @@ impl Table {
         if gs == 1 && rs == 1 {
             return false;
         }
-        for rr in r..r + rs {
-            for cc in c..c + gs {
+        // Spans come from the file and may reach past the table; only walk the cells that exist.
+        for rr in r..r.saturating_add(rs).min(self.rows.len()) {
+            for cc in c..c.saturating_add(gs).min(self.cols.len()) {
                 if let Some(x) = self.cell_mut(rr, cc) {
                     x.h_merge = false;
                     x.v_merge = false;
@@ -349,4 +350,15 @@ mod tests {
         assert!(!one.delete_row(0) && !one.delete_col(0));
         assert!(table_styles().len() > 30);
     }
+
+    #[test]
+    fn split_ignores_spans_past_the_table() {
+        let mut t = Table::new(2, 2, 100.0, 10.0);
+        if let Some(c) = t.cell_mut(0, 0) {
+            c.grid_span = u32::MAX;
+            c.row_span = u32::MAX;
+        }
+        assert!(t.split(0, 0));
+        assert_eq!(t.cell(0, 0).map(|c| (c.grid_span, c.row_span)), Some((1, 1)));
+    }
 }

From d4cf50dd3d2e4c668d019405590ca663ca363b03 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:35:59 +0200
Subject: [PATCH 111/376] MCP: do not resend a command whose reply was lost
 (#409)

---
 crates/mcp/src/backend.rs | 129 +++++++++++++++++++++++++++++++++-----
 1 file changed, 113 insertions(+), 16 deletions(-)

diff --git a/crates/mcp/src/backend.rs b/crates/mcp/src/backend.rs
index f3686545..cc43b4ee 100644
--- a/crates/mcp/src/backend.rs
+++ b/crates/mcp/src/backend.rs
@@ -55,16 +55,24 @@ impl Remote {
         Err(last)
     }
 
-    fn roundtrip(&mut self, line: &str) -> std::io::Result<String> {
-        if self.conn.is_none() {
+    /// Write one request line. A failure here means the app never got a complete line, so retrying is safe.
+    /// A connection the app has already closed (it restarted since the last call) is replaced before writing.
+    fn send(&mut self, line: &str) -> std::io::Result<()> {
+        if self.conn.as_ref().is_none_or(|(_, writer)| is_closed(writer)) {
             self.reconnect()?;
         }
-        let Some((reader, writer)) = self.conn.as_mut() else {
+        let Some((_, writer)) = self.conn.as_mut() else {
+            return Err(std::io::Error::new(std::io::ErrorKind::NotConnected, "not connected"));
+        };
+        writer.write_all(format!("{line}\n").as_bytes())?;
+        writer.flush()
+    }
+
+    /// Read the reply to a request that was already sent.
+    fn receive(&mut self) -> std::io::Result<String> {
+        let Some((reader, _)) = self.conn.as_mut() else {
             return Err(std::io::Error::new(std::io::ErrorKind::NotConnected, "not connected"));
         };
-        writer.write_all(line.as_bytes())?;
-        writer.write_all(b"\n")?;
-        writer.flush()?;
         let mut reply = String::new();
         if reader.read_line(&mut reply)? == 0 {
             return Err(std::io::Error::new(std::io::ErrorKind::UnexpectedEof, "control channel closed"));
@@ -73,22 +81,39 @@ impl Remote {
     }
 }
 
+/// True when the peer has closed or reset `stream`, or sent bytes nobody asked for. Between calls nothing
+/// should be waiting, so only "would block" means the connection is still good.
+fn is_closed(stream: &TcpStream) -> bool {
+    if stream.set_nonblocking(true).is_err() {
+        return true;
+    }
+    let mut byte = [0u8; 1];
+    let open = matches!(stream.peek(&mut byte), Err(e) if e.kind() == std::io::ErrorKind::WouldBlock);
+    stream.set_nonblocking(false).is_err() || !open
+}
+
 impl Backend for Remote {
     fn call(&mut self, method: &str, params: Value) -> Result<Value, String> {
         let id = self.next_id;
         self.next_id += 1;
         let line = json!({"id": id, "method": method, "params": params}).to_string();
-        // One retry with a fresh connection (the app may have restarted).
-        let reply = match self.roundtrip(&line) {
-            Ok(r) => r,
-            Err(_) => {
+        // One retry with a fresh connection (the app may have restarted), but only while the request
+        // was not sent. Once it is out, a lost reply leaves the outcome unknown and a resend could
+        // run an insert/delete/undo twice, so report that instead.
+        if self.send(&line).is_err() {
+            self.conn = None;
+            self.send(&line).map_err(|e| {
                 self.conn = None;
-                self.roundtrip(&line).map_err(|e| {
-                    self.conn = None;
-                    format!("DeckCraft app at {} is not reachable: {e}", self.addr)
-                })?
-            }
-        };
+                format!("DeckCraft app at {} is not reachable: {e}", self.addr)
+            })?;
+        }
+        let reply = self.receive().map_err(|e| {
+            self.conn = None;
+            format!(
+                "lost the reply from the DeckCraft app at {} ({e}); the command may or may not have run, check the document before retrying",
+                self.addr
+            )
+        })?;
         let v: Value = serde_json::from_str(reply.trim()).map_err(|e| format!("bad reply from app: {e}"))?;
         if v.get("ok").and_then(Value::as_bool) == Some(true) {
             Ok(v.get("result").cloned().unwrap_or(Value::Null))
@@ -105,3 +130,75 @@ impl Backend for Remote {
         format!("connected to the DeckCraft app at {}", self.addr)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::net::TcpListener;
+    use std::sync::Arc;
+    use std::sync::atomic::{AtomicUsize, Ordering};
+
+    #[test]
+    fn lost_reply_is_not_resent() {
+        let listener = TcpListener::bind("127.0.0.1:0").expect("bind");
+        let addr = listener.local_addr().expect("addr").to_string();
+        let executed = Arc::new(AtomicUsize::new(0));
+        let count = Arc::clone(&executed);
+        std::thread::spawn(move || {
+            for stream in listener.incoming().flatten() {
+                let mut reader = BufReader::new(&stream);
+                let mut line = String::new();
+                if reader.read_line(&mut line).unwrap_or(0) == 0 {
+                    continue;
+                }
+                let n = count.fetch_add(1, Ordering::SeqCst) + 1;
+                if n > 1 {
+                    let mut w = &stream;
+                    let _ = w.write_all(b"{\"id\":2,\"ok\":true,\"result\":null}\n");
+                }
+                // The first request is executed, then the connection drops without a reply.
+            }
+        });
+        let mut remote = Remote::connect(&addr).expect("connect");
+        let err = remote.call("engine.execute", json!({})).expect_err("lost reply must be an error");
+        assert!(err.contains("may or may not have run"), "{err}");
+        assert_eq!(executed.load(Ordering::SeqCst), 1, "the command must not be replayed");
+        // The next call opens a fresh connection and works.
+        assert!(remote.call("document.inspect", json!({})).is_ok());
+        assert_eq!(executed.load(Ordering::SeqCst), 2);
+    }
+
+    #[test]
+    fn connection_closed_before_the_call_is_retried() {
+        let listener = TcpListener::bind("127.0.0.1:0").expect("bind");
+        let addr = listener.local_addr().expect("addr").to_string();
+        let (closed_tx, closed_rx) = std::sync::mpsc::channel();
+        let executed = Arc::new(AtomicUsize::new(0));
+        let count = Arc::clone(&executed);
+        std::thread::spawn(move || {
+            let mut first = true;
+            for stream in listener.incoming().flatten() {
+                if first {
+                    // The app restarts: the first connection closes before any request arrives.
+                    first = false;
+                    drop(stream);
+                    let _ = closed_tx.send(());
+                    continue;
+                }
+                let mut reader = BufReader::new(&stream);
+                let mut line = String::new();
+                if reader.read_line(&mut line).unwrap_or(0) == 0 {
+                    continue;
+                }
+                count.fetch_add(1, Ordering::SeqCst);
+                let mut w = &stream;
+                let _ = w.write_all(b"{\"id\":1,\"ok\":true,\"result\":null}\n");
+            }
+        });
+        let mut remote = Remote::connect(&addr).expect("connect");
+        closed_rx.recv().expect("server closed the first connection");
+        std::thread::sleep(Duration::from_millis(200));
+        assert!(remote.call("engine.execute", json!({})).is_ok(), "a request that never left must be sent on a fresh connection");
+        assert_eq!(executed.load(Ordering::SeqCst), 1);
+    }
+}

From 902edb3c853de79aa102678e199e9c79ba7da7b0 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:38:25 +0200
Subject: [PATCH 112/376] UI: notes, alt text and rename drafts no longer carry
 over to another document (#413)

---
 crates/ui-egui/src/panes.rs   |  8 +++++---
 crates/ui-egui/src/selpane.rs | 26 ++++++++++++++++++++++++++
 crates/ui-egui/src/sorter.rs  |  9 +++++----
 crates/ui-egui/src/widgets.rs | 24 ++++++++++++++++++++++++
 4 files changed, 60 insertions(+), 7 deletions(-)

diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..1dea9db1 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -93,6 +93,7 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
         return;
     };
     let x = deckcraft_engine::cmd::xfrm_of(&st.doc, &st.selection, &sh);
+    let uid = st.uid;
     // Tabs as icons.
     ui.horizontal(|ui| {
         for (tab, icon, tip) in [
@@ -173,13 +174,14 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
             fields(ui, "Vertical", "fy", x.y, "y", "shape.move", 72.0);
             ui.add_space(6.0);
             ui.label(egui::RichText::new("Alt Text").font(theme::bold(13.0)));
-            let id = ui.id().with(("alt", sh.id.0));
-            let mut alt: String = ui.data_mut(|d| d.get_temp(id).unwrap_or_else(|| sh.descr.clone()));
+            let id = ui.id().with(("alt", uid, sh.id.0));
+            let stored: Option<(String, String)> = ui.data_mut(|d| d.get_temp(id));
+            let mut alt = widgets::text_draft(stored, &sh.descr);
             let r = ui.add(egui::TextEdit::multiline(&mut alt).desired_rows(3).desired_width(f32::INFINITY));
             if r.lost_focus() && alt != sh.descr {
                 run(app, "shape.altText", json!({"text": alt}));
             }
-            ui.data_mut(|d| d.insert_temp(id, alt));
+            ui.data_mut(|d| d.insert_temp(id, (sh.descr.clone(), alt)));
         }
         "text" => {
             ui.label(egui::RichText::new("Text Box").font(theme::bold(13.0)));
diff --git a/crates/ui-egui/src/selpane.rs b/crates/ui-egui/src/selpane.rs
index 414a61f5..36e634c7 100644
--- a/crates/ui-egui/src/selpane.rs
+++ b/crates/ui-egui/src/selpane.rs
@@ -28,6 +28,18 @@ pub struct State {
     pub anchor: Option<u32>,
     /// Row being dragged and the drop it would make: (index among siblings, line y).
     pub drag: Option<(u32, Option<(usize, f32)>)>,
+    /// Document (by uid) the state above belongs to.
+    owner: Option<u64>,
+}
+
+impl State {
+    /// Ties the pane state to a document: shape ids repeat between documents, so switching
+    /// documents drops the pending rename, folds, anchor and drag.
+    pub fn bind(&mut self, uid: u64) {
+        if self.owner != Some(uid) {
+            *self = State { owner: Some(uid), ..State::default() };
+        }
+    }
 }
 
 /// One line of the list.
@@ -108,6 +120,7 @@ fn small_icon_button(ui: &mut Ui, icon: Icon, label: &str, enabled: bool) -> egu
 pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
     let Some(st) = app.session.active() else { return };
+    app.selpane.bind(st.uid);
     let rows = rows(st.shapes(), &app.selpane.collapsed);
     let selected: Vec<u32> = st.selection.shapes.iter().map(|i| i.0).collect();
     let has_sel = !selected.is_empty();
@@ -388,6 +401,19 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response, row: &Row) {
 mod tests {
     use super::*;
 
+    #[test]
+    fn switching_document_drops_a_pending_rename() {
+        let mut s = State::default();
+        s.bind(1);
+        s.renaming = Some((5, "draft".to_string()));
+        s.collapsed.insert(2);
+        s.bind(1);
+        assert!(s.renaming.is_some(), "same document keeps the draft");
+        s.bind(2);
+        assert!(s.renaming.is_none());
+        assert!(s.collapsed.is_empty());
+    }
+
     fn r(id: u32, top: f32) -> (u32, Rect) {
         (id, Rect::from_min_size(pos2(0.0, top), vec2(100.0, ROW_H)))
     }
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index dd26dd85..a8e3054c 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -3,8 +3,8 @@
 use egui::{Align2, Color32, CornerRadius, Rect, Sense, Stroke, Ui, pos2, vec2};
 use serde_json::json;
 
-use crate::SlideApp;
 use crate::theme::{self, Tokens};
+use crate::{SlideApp, widgets};
 
 /// Grid of slides; click selects, double-click opens in Normal view, drag reorders.
 pub fn show(app: &mut SlideApp, ui: &mut Ui) {
@@ -133,8 +133,9 @@ pub fn notes_page(app: &mut SlideApp, ui: &mut Ui) {
     let notes_rect = Rect::from_min_max(pos2(srect.min.x, srect.max.y + 24.0), pos2(srect.max.x, page.max.y - page_h * 0.06));
     let mut child = ui.new_child(egui::UiBuilder::new().max_rect(notes_rect));
     let current = st.current_slide().map(|s| s.notes_text()).unwrap_or_default();
-    let id = egui::Id::new(("notespage", idx));
-    let mut buf: String = child.data_mut(|d| d.get_temp(id).unwrap_or_else(|| current.clone()));
+    let id = egui::Id::new(("notespage", st.uid, idx));
+    let stored: Option<(String, String)> = child.data_mut(|d| d.get_temp(id));
+    let mut buf = widgets::text_draft(stored, &current);
     let r = child.add(
         egui::TextEdit::multiline(&mut buf)
             .hint_text("Click to add text")
@@ -147,7 +148,7 @@ pub fn notes_page(app: &mut SlideApp, ui: &mut Ui) {
     if r.lost_focus() && buf != current {
         let _ = app.run("slide.notes", json!({"text": buf, "index": idx}));
     }
-    child.data_mut(|d| d.insert_temp(id, buf));
+    child.data_mut(|d| d.insert_temp(id, (current, buf)));
     let nav = ui.input(|i| (i.key_pressed(egui::Key::PageDown), i.key_pressed(egui::Key::PageUp)));
     if nav.0 {
         let _ = app.run("slide.next", json!({}));
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 5827b396..a97e47fb 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -423,6 +423,15 @@ pub fn fmt_num(v: f64, suffix: &str) -> String {
     format!("{s}{suffix}")
 }
 
+/// The text a kept-open text box shows: the typed draft while the stored value is still what the
+/// draft started from, otherwise the stored value (another document, a reorder or an undo changed it).
+pub fn text_draft(stored: Option<(String, String)>, current: &str) -> String {
+    match stored {
+        Some((base, buf)) if base == current => buf,
+        _ => current.to_string(),
+    }
+}
+
 /// Section header inside panes.
 pub fn section(ui: &mut Ui, title: &str, open: bool) -> bool {
     let t = Tokens::get(ui.ctx());
@@ -485,4 +494,19 @@ mod tests {
         assert_eq!(*picked.borrow(), Some(Some(ColorRef::rgb(Rgba::from_hex("00FF00").unwrap()))));
         assert!(harness.query_by_role(Role::TextInput).is_none(), "picking a colour closes the menu");
     }
+
+    /// #413: a draft is kept while the stored text is unchanged ...
+    #[test]
+    fn text_draft_keeps_typing_while_the_stored_text_is_unchanged() {
+        let stored = Some(("old".to_string(), "old plus typing".to_string()));
+        assert_eq!(text_draft(stored, "old"), "old plus typing");
+    }
+
+    /// ... and dropped when the stored text changes underneath it.
+    #[test]
+    fn text_draft_drops_a_stale_draft_when_the_stored_text_changes() {
+        let stored = Some(("old".to_string(), "old plus typing".to_string()));
+        assert_eq!(text_draft(stored, "undone"), "undone");
+        assert_eq!(text_draft(None, "fresh"), "fresh");
+    }
 }

From 09b72e4b70562868e2f939389aea9f839956b5f7 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:37:02 +0200
Subject: [PATCH 113/376] Pptx: keep the math namespace equations inherit from
 the slide root or a wrapper (#412)

---
 crates/pptx/src/read/dml.rs  |  2 +-
 crates/pptx/src/read/mod.rs  | 38 ++++++++++++++++-
 crates/pptx/tests/math_ns.rs | 82 ++++++++++++++++++++++++++++++++++++
 3 files changed, 120 insertions(+), 2 deletions(-)
 create mode 100644 crates/pptx/tests/math_ns.rs

diff --git a/crates/pptx/src/read/dml.rs b/crates/pptx/src/read/dml.rs
index 0aee935c..eae6f51f 100644
--- a/crates/pptx/src/read/dml.rs
+++ b/crates/pptx/src/read/dml.rs
@@ -579,7 +579,7 @@ pub fn paragraph(imp: &mut Imp, part: &Part, p: &El) -> Paragraph {
                 for t in ts {
                     text.push_str(&t.text());
                 }
-                let omml = e.elements().map(|c| c.to_xml()).collect::<String>();
+                let omml = e.elements().map(|c| part.keep_inner(c)).collect::<String>();
                 para.runs.push(Run { text, props: RunProps::default(), kind: RunKind::Math { omml } });
             }
             "endParaRPr" => para.end_props = rpr(imp, part, e),
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..e7a3b9bb 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -71,16 +71,52 @@ pub struct Part {
     pub name: String,
     pub rels: Rels,
     pub ns: Vec<(String, String)>,
+    /// Prefixes bound below the root only (on a wrapper such as `mc:Choice`), each to one namespace.
+    pub inner_ns: Vec<(String, String)>,
 }
 
 impl Part {
     pub fn new(pkg: &Package, name: &str, doc: &Doc) -> Self {
-        Part { name: name.to_string(), rels: pkg.rels(name), ns: doc.ns_decls() }
+        let ns = doc.ns_decls();
+        Part { name: name.to_string(), rels: pkg.rels(name), inner_ns: inner_decls(&doc.root, &ns), ns }
     }
     /// Serialize an element with the namespace declarations it needs from the part root.
     pub fn keep(&self, el: &El) -> String {
         keep_xml(el, &self.ns)
     }
+    /// Like [`Part::keep`], also declaring prefixes that only an enclosing wrapper binds.
+    pub fn keep_inner(&self, el: &El) -> String {
+        let ns: Vec<(String, String)> = self.ns.iter().chain(&self.inner_ns).cloned().collect();
+        keep_xml(el, &ns)
+    }
+}
+
+/// Prefixes declared below the root but not on it, skipping any bound to different namespaces.
+fn inner_decls(root: &El, ns: &[(String, String)]) -> Vec<(String, String)> {
+    fn rec(e: &El, out: &mut Vec<(String, String)>, clash: &mut HashSet<String>, depth: usize) {
+        if depth > crate::xml::MAX_DEPTH {
+            return;
+        }
+        for (k, v) in e.attrs.iter().filter(|(k, _)| k.starts_with("xmlns:")) {
+            match out.iter().find(|(o, _)| o == k).map(|(_, u)| u != v) {
+                Some(true) => {
+                    clash.insert(k.clone());
+                }
+                Some(false) => {}
+                None => out.push((k.clone(), v.clone())),
+            }
+        }
+        for c in e.elements() {
+            rec(c, out, clash, depth + 1);
+        }
+    }
+    let mut out = vec![];
+    let mut clash = HashSet::new();
+    for c in root.elements() {
+        rec(c, &mut out, &mut clash, 1);
+    }
+    out.retain(|(k, _)| !clash.contains(k) && !ns.iter().any(|(r, _)| r == k));
+    out
 }
 
 /// Serialize `el`, declaring every prefix it uses that the source root declared.
diff --git a/crates/pptx/tests/math_ns.rs b/crates/pptx/tests/math_ns.rs
new file mode 100644
index 00000000..f5cc6bec
--- /dev/null
+++ b/crates/pptx/tests/math_ns.rs
@@ -0,0 +1,82 @@
+//! Equations whose math namespace is declared above the equation: on the slide root or on a wrapper.
+
+use std::io::{Cursor, Read, Write};
+
+use deckcraft_geom::Xfrm;
+use deckcraft_model::text::{Paragraph, Run, RunKind, RunProps, TextBody};
+use deckcraft_model::{Shape, ShapeId, defaults};
+
+const NS_M: &str = r#"xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math""#;
+
+fn entries(bytes: &[u8]) -> Vec<(String, Vec<u8>)> {
+    let mut z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    (0..z.len())
+        .map(|i| {
+            let mut f = z.by_index(i).expect("entry");
+            let mut d = vec![];
+            f.read_to_end(&mut d).expect("read");
+            (f.name().to_string(), d)
+        })
+        .collect()
+}
+
+fn rezip(es: &[(String, Vec<u8>)]) -> Vec<u8> {
+    let mut z = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let o = zip::write::SimpleFileOptions::default();
+    for (n, d) in es {
+        z.start_file(n.as_str(), o).expect("start");
+        z.write_all(d).expect("write");
+    }
+    z.finish().expect("finish").into_inner()
+}
+
+/// Export an equation, move its `xmlns:m` from the equation to the element `host` opens, and
+/// return the OMML read back.
+fn moved_to(host: &str) -> String {
+    let mut p = defaults::new_presentation(None);
+    let id = ShapeId(p.alloc_id());
+    let omml = format!("<m:oMathPara {NS_M}><m:oMath><m:r><m:t>x=1</m:t></m:r></m:oMath></m:oMathPara>");
+    let eq = Shape {
+        id,
+        name: "Equation".into(),
+        xfrm: Some(Xfrm::new(10.0, 10.0, 200.0, 40.0)),
+        text: Some(TextBody {
+            paragraphs: vec![Paragraph {
+                runs: vec![Run { text: "x=1".into(), props: RunProps::default(), kind: RunKind::Math { omml } }],
+                ..Default::default()
+            }],
+            ..Default::default()
+        }),
+        ..Default::default()
+    };
+    if let Some(s) = p.slides.first_mut() {
+        std::sync::Arc::make_mut(s).shapes = vec![eq];
+    }
+    let mut es = entries(&deckcraft_pptx::export(&p).expect("export"));
+    let slide = es.iter_mut().find(|(n, _)| n == "ppt/slides/slide1.xml").expect("slide1");
+    let xml = String::from_utf8(slide.1.clone()).expect("utf8");
+    assert!(xml.contains(host), "{xml}");
+    let xml = xml.replacen(&format!(" {NS_M}"), "", 1).replacen(host, &format!("{host}{NS_M} "), 1);
+    assert_eq!(xml.matches(NS_M).count(), 1);
+    slide.1 = xml.into_bytes();
+
+    let q = deckcraft_pptx::import(&rezip(&es)).expect("import");
+    let shape = q.slides[0].shapes.iter().find(|s| s.name == "Equation").expect("shape");
+    let run = shape.text.as_ref().and_then(|t| t.paragraphs.first()).and_then(|p| p.runs.first()).expect("run");
+    match &run.kind {
+        RunKind::Math { omml } => omml.clone(),
+        other => panic!("{other:?}"),
+    }
+}
+
+#[test]
+fn math_namespace_declared_on_the_slide_root_is_kept() {
+    let omml = moved_to("<p:sld ");
+    assert!(omml.contains(NS_M), "{omml}");
+}
+
+#[test]
+fn math_namespace_declared_on_an_enclosing_wrapper_is_kept() {
+    let omml = moved_to("<mc:Choice ");
+    assert!(omml.contains(NS_M), "{omml}");
+}

From 97855c70a06f6d632ded50f9a56c65500ab546bd Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:48:28 +0200
Subject: [PATCH 114/376] File: save through a unique, exclusively created
 temporary file (#391)

---
 crates/engine/src/cmd/file.rs | 66 ++++++++++++++++++++++++++++++++---
 1 file changed, 62 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..0fd30ce9 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -215,10 +215,30 @@ fn mark_saved(s: &mut Session, path: Option<String>) -> Result<()> {
 
 #[cfg(not(target_arch = "wasm32"))]
 fn write_file(path: &str, bytes: &[u8]) -> Result<()> {
-    // Write to a temporary sibling then rename, so a failed save never truncates the old file.
-    let tmp = format!("{path}.saving");
-    std::fs::write(&tmp, bytes).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
-    std::fs::rename(&tmp, path).map_err(|e| EngineError::Other(format!("{path}: {e}")))
+    use std::io::Write;
+    use std::sync::atomic::{AtomicU64, Ordering};
+    static COUNTER: AtomicU64 = AtomicU64::new(0);
+    let err = |e: std::io::Error| EngineError::Other(format!("{path}: {e}"));
+    // Write to a uniquely named temporary sibling, created exclusively (never following or reusing an
+    // existing file or symlink), then rename it over the destination so a failed save never truncates
+    // the old file and concurrent saves never share temporary bytes.
+    let mut attempts = 0;
+    let (tmp, mut file) = loop {
+        let tmp = format!("{path}.{}.{}.saving", std::process::id(), COUNTER.fetch_add(1, Ordering::Relaxed));
+        match std::fs::OpenOptions::new().write(true).create_new(true).open(&tmp) {
+            Ok(f) => break (tmp, f),
+            Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists && attempts < 16 => attempts += 1,
+            Err(e) => return Err(err(e)),
+        }
+    };
+    let written = file.write_all(bytes).and_then(|()| file.sync_all());
+    drop(file);
+    let result = written.and_then(|()| std::fs::rename(&tmp, path));
+    if let Err(e) = result {
+        let _ = std::fs::remove_file(&tmp);
+        return Err(err(e));
+    }
+    Ok(())
 }
 #[cfg(target_arch = "wasm32")]
 fn write_file(_path: &str, _bytes: &[u8]) -> Result<()> {
@@ -430,3 +450,41 @@ fn recovery_discard(s: &mut Session, p: &Value) -> Result<Value> {
     }
     ok()
 }
+
+#[cfg(all(test, not(target_arch = "wasm32")))]
+mod tests {
+    use super::write_file;
+
+    fn scratch(name: &str) -> std::path::PathBuf {
+        let dir = std::env::temp_dir().join(format!("deckcraft-write-file-{}-{name}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        std::fs::create_dir_all(&dir).unwrap();
+        dir
+    }
+
+    #[test]
+    fn write_file_does_not_touch_a_predictable_saving_sibling() {
+        let dir = scratch("sibling");
+        let dest = dir.join("deck.deckcraft");
+        let dest_str = dest.to_str().unwrap();
+        std::fs::write(&dest, b"old").unwrap();
+        std::fs::write(dir.join("deck.deckcraft.saving"), b"precious").unwrap();
+        write_file(dest_str, b"new").unwrap();
+        assert_eq!(std::fs::read(&dest).unwrap(), b"new");
+        assert_eq!(std::fs::read(dir.join("deck.deckcraft.saving")).unwrap(), b"precious");
+        let names: Vec<_> = std::fs::read_dir(&dir).unwrap().map(|e| e.unwrap().file_name()).collect();
+        assert_eq!(names.len(), 2, "no temporary file may be left behind: {names:?}");
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn write_file_failed_rename_keeps_destination_and_cleans_up() {
+        let dir = scratch("failed");
+        let dest = dir.join("target");
+        std::fs::create_dir(&dest).unwrap();
+        assert!(write_file(dest.to_str().unwrap(), b"new").is_err());
+        assert!(dest.is_dir());
+        assert_eq!(std::fs::read_dir(&dir).unwrap().count(), 1);
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+}

From 007741718ec28fbdf61b877122d4bd7c2653b573 Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Tue, 13 Oct 2026 17:48:38 +0200
Subject: [PATCH 115/376] Slide: leading tabs in a new slide's body set the
 outline level (#370)

---
 crates/engine/src/cmd/slide.rs | 28 +++++++++++++++++++++++++++-
 crates/engine/src/cmd/text.rs  | 22 ++++++++++++++++------
 2 files changed, 43 insertions(+), 7 deletions(-)

diff --git a/crates/engine/src/cmd/slide.rs b/crates/engine/src/cmd/slide.rs
index 3d8ad344..105678ca 100644
--- a/crates/engine/src/cmd/slide.rs
+++ b/crates/engine/src/cmd/slide.rs
@@ -108,7 +108,12 @@ fn new(s: &mut Session, p: &Value) -> Result<Value> {
         if let Some(b) = str_param(p, "body")
             && let Some(sh) = slide.shapes.iter_mut().find(|x| x.ph_type().is_some_and(|k| !k.is_title()))
         {
-            sh.text = Some(TextBody::from_text(b));
+            let mut body = TextBody::from_text(b);
+            // Leading tabs set the outline level, as in text.set.
+            for para in &mut body.paragraphs {
+                super::text::apply_leading_tabs(para);
+            }
+            sh.text = Some(body);
         }
         let at = usize_param(p, "at").unwrap_or(if doc.slides.is_empty() { 0 } else { sel.slide + 1 }).min(doc.slides.len());
         let id = slide.id;
@@ -584,3 +589,24 @@ fn from_outline(s: &mut Session, p: &Value) -> Result<Value> {
         Ok(json!({"slides": n}))
     })
 }
+
+#[cfg(test)]
+mod tests {
+    use serde_json::json;
+
+    use crate::Session;
+
+    #[test]
+    fn new_slide_body_leading_tabs_become_levels() {
+        let mut s = Session::with_new();
+        let text = "Level one\n\tLevel two\n\t\tLevel three\nLevel one again";
+        s.execute("slide.new", &json!({"layout": "titleAndContent", "title": "Indent", "body": text})).expect("new slide");
+        let st = s.doc().expect("doc");
+        let slide = st.doc.slides.get(st.selection.slide).expect("slide");
+        let body = slide.shapes.iter().find(|x| x.ph_type().is_some_and(|k| !k.is_title())).expect("body");
+        let paras = &body.text.as_ref().expect("text").paragraphs;
+        let got: Vec<(u8, String)> = paras.iter().map(|p| (p.level, p.text())).collect();
+        let want = [(0, "Level one"), (1, "Level two"), (2, "Level three"), (0, "Level one again")];
+        assert_eq!(got, want.iter().map(|(l, t)| (*l, t.to_string())).collect::<Vec<_>>());
+    }
+}
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..545ce54c 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -687,6 +687,20 @@ fn select_para(s: &mut Session, p: &Value) -> Result<Value> {
     ok()
 }
 
+/// Turn leading tabs of a paragraph into its outline level (capped at 8) and strip them.
+/// Returns whether any tab was found.
+pub(crate) fn apply_leading_tabs(para: &mut deckcraft_model::text::Paragraph) -> bool {
+    let tabs = para.runs.first().map(|r| r.text.chars().take_while(|c| *c == '\t').count()).unwrap_or(0);
+    if tabs == 0 {
+        return false;
+    }
+    if let Some(r) = para.runs.first_mut() {
+        r.text = r.text.trim_start_matches('\t').to_string();
+    }
+    para.level = tabs.min(8) as u8;
+    true
+}
+
 fn set(s: &mut Session, p: &Value) -> Result<Value> {
     let text = str_param(p, "text").ok_or_else(|| bad("text.set", "missing `text`"))?.to_string();
     let id = match id_param(p, "id") {
@@ -706,13 +720,9 @@ fn set(s: &mut Session, p: &Value) -> Result<Value> {
         let mut nb = TextBody::from_text(&text);
         for (i, para) in nb.paragraphs.iter_mut().enumerate() {
             // Leading tabs set the outline level.
-            let tabs = para.runs.first().map(|r| r.text.chars().take_while(|c| *c == '\t').count()).unwrap_or(0);
-            if tabs > 0
-                && let Some(r) = para.runs.first_mut()
+            if !apply_leading_tabs(para)
+                && let Some((lv, pp)) = levels.get(i)
             {
-                r.text = r.text.trim_start_matches('\t').to_string();
-                para.level = tabs.min(8) as u8;
-            } else if let Some((lv, pp)) = levels.get(i) {
                 para.level = *lv;
                 para.props = pp.clone();
             }

From 8ba97e61beb17167067bfb787cd9e12e3d4701a0 Mon Sep 17 00:00:00 2001
From: Sazid Al Bayazid <race-relish-stick@duck.com>
Date: Tue, 13 Oct 2026 21:58:25 +0600
Subject: [PATCH 116/376] Slide show: Honeycomb's hexagons cover the whole
 slide again (#420)

The row count came from 1/(1.5*rh) - the row spacing alone - and
ignored how far a settled hexagon actually reaches. On a 16:9 slide
the eleven rows stopped at ~75% of the height: from t~0.9, when every
cell has settled, the bottom quarter was plain black until the t=1
endpoint snapped to the full new slide.

The count now derives from the real geometry: rows sit 0.866*rh apart
and the flat bottom zone of a settled hexagon reaches 0.289*rh past
its centre, so counting to the flat-zone reach covers the slide for
every aspect ratio - counting to the vertex reach still left small
V-notches of black above the bottom edge on about a third of them
(US Letter, square, ...). 16:9 gains four rows (15, was 11), 4:3
seven (20, was 13).

Tests: at t=0.99, when every cell is settled and the seams are nearly
closed, a 0.02-step grid over the slide must sit inside settled
incoming cells (padded 1% past the hairline seams) on five aspect
ratios including US Letter and square. Fails on the old count at
(0.2, 0.74); before/after frames rendered with render-transition.
---
 ROADMAP.md                       |  1 +
 crates/anim/src/tests.rs         | 30 ++++++++++++++++++++++++++++++
 crates/anim/src/transition_fx.rs |  6 +++++-
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..9dfaece0 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Slide show: Honeycomb's hexagons cover the whole slide again — the bottom quarter stayed black until the endpoint (#420) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..18d934fa 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -789,3 +789,33 @@ fn show_follows_links() {
     assert_eq!(s.follow(&p, &Action::LastViewed, None), LinkJump::None);
     assert_eq!(s.slide, 3);
 }
+
+/// #420: late in the Honeycomb every cell has settled, so the incoming hexagons must cover the
+/// whole slide — the old row count stopped at ~75% of a 16:9 slide and left the bottom black.
+#[test]
+fn honeycomb_cells_reach_the_bottom_before_the_slide_ends() {
+    let sign = |a: [f64; 2], b: [f64; 2], c: [f64; 2]| (a[0] - c[0]) * (b[1] - c[1]) - (b[0] - c[0]) * (a[1] - c[1]);
+    let inside = |p: [f64; 2], t: [[f64; 2]; 3]| {
+        // The dark seams between cells are the effect: at t=0.99 they are ~0.012% of the width
+        // open, so a 1% pad forgives them and still fails genuinely uncovered ground.
+        let c = [(t[0][0] + t[1][0] + t[2][0]) / 3.0, (t[0][1] + t[1][1] + t[2][1]) / 3.0];
+        let t = t.map(|v| [c[0] + (v[0] - c[0]) * 1.01, c[1] + (v[1] - c[1]) * 1.01]);
+        let (d1, d2, d3) = (sign(p, t[0], t[1]), sign(p, t[1], t[2]), sign(p, t[2], t[0]));
+        !((d1 < 0.0 || d2 < 0.0 || d3 < 0.0) && (d1 > 0.0 || d2 > 0.0 || d3 > 0.0))
+    };
+    for aspect in [16.0 / 9.0, 3.0 / 2.0, 4.0 / 3.0, 11.0 / 8.5, 1.0] {
+        // t = 0.99: every cell is settled and the seams are nearly closed.
+        let ls = transition_frame("honeycomb", "", 0.99, aspect);
+        let tris: Vec<[[f64; 2]; 3]> =
+            ls.iter().filter(|l| l.source == Source::New && l.alpha >= 1.0).map(|l| [l.quad[0], l.quad[1], l.quad[2]]).collect();
+        assert!(!tris.is_empty());
+        let mut sy = 0.0;
+        while sy <= 1.0 {
+            for sx in [0.0, 0.2, 0.4, 0.6, 0.8, 0.99, 1.0] {
+                let p = [sx, sy];
+                assert!(tris.iter().any(|t| inside(p, *t)), "honeycomb aspect {aspect} t=0.99: {sx},{sy} is uncovered (no settled cell reaches it)");
+            }
+            sy += 0.02;
+        }
+    }
+}
diff --git a/crates/anim/src/transition_fx.rs b/crates/anim/src/transition_fx.rs
index d5fb2e16..3bbc4a8d 100644
--- a/crates/anim/src/transition_fx.rs
+++ b/crates/anim/src/transition_fx.rs
@@ -794,7 +794,11 @@ fn honeycomb(t: f64, a: f64) -> Vec<Layer> {
     let cols = 11usize;
     let w = 1.0 / cols as f64;
     let rh = w * a * 0.5;
-    let rows = (1.0 / (rh * 1.5)).ceil() as usize + 2;
+    // Rows sit 0.866*rh apart; a settled hex reaches only 0.577*rh from its centre at the side
+    // vertices, and the flat bottom zone 0.289*rh. Count the rows whose FLAT zone still covers
+    // the slide's bottom: counting the vertex reach instead left V-notches of black above the
+    // bottom edge on about a third of the aspect ratios (#420).
+    let rows = ((1.0 / (rh * 0.866) - 1.0 / 3.0).ceil().max(1.0)) as usize + 1;
     let mut v = vec![Layer::full(Black, 1.0)];
     let seam = ss(win(t, 0.0, 0.12)) * (1.0 - ss(win(t, 0.85, 1.0)));
     let hex = |cx: f64, cy: f64, s: f64| -> Vec<[f64; 2]> {

From 1baf1f5569565944f77b1c6be2775b77c2c9f419 Mon Sep 17 00:00:00 2001
From: Zetenypapp <pappzeteny0223@gmail.com>
Date: Tue, 13 Oct 2026 18:45:38 +0200
Subject: [PATCH 117/376] Copy and Cut buttons and menus put the text on the
 system clipboard (#431)

Ctrl+C and Ctrl+X ran edit.copy / edit.cut and handed the returned text
to egui's clipboard; the ribbon's Copy and Cut, the slide's right-click
menu, the menus, the palette and the control channel ran the same
commands through SlideApp::run, which dropped the text, so it never left
DeckCraft. SlideApp::run now keeps the text of a successful Copy or Cut
and hands it to the clipboard on the next frame, like pending URLs.

Regression test: copy_and_cut_commands_reach_the_system_clipboard runs
both commands and checks the frame's CopyText output (it fails without
the fix).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 ROADMAP.md                |  1 +
 crates/ui-egui/src/lib.rs | 56 +++++++++++++++++++++++++++++++++++++--
 2 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..e372fb9e 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Copy and Cut from the ribbon, the slide's right-click menu and the menus put the text on the system clipboard, as Ctrl+C and Ctrl+X do (#431) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..9ab7d048 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -209,6 +209,8 @@ pub struct SlideApp {
     /// creating or closing a presentation leaves it.
     pub backstage: Option<backstage::Backstage>,
     pending_urls: Vec<String>,
+    /// Text for the system clipboard from a Copy or Cut command, handed over on the next frame.
+    pending_copy: Option<String>,
     shot_token: u64,
     queued_shots: Vec<(u64, f64, u32)>,
     pending_shots: Vec<(u64, Option<String>, Sender<ControlResponse>, f64)>,
@@ -254,6 +256,7 @@ impl SlideApp {
             integrated_titlebar: false,
             backstage: None,
             pending_urls: vec![],
+            pending_copy: None,
             shot_token: 0,
             queued_shots: vec![],
             pending_shots: vec![],
@@ -287,8 +290,16 @@ impl SlideApp {
         } else {
             self.session.execute(id, &params).map_err(|e| e.to_string())
         };
-        if let Err(e) = &r {
-            self.set_status(e.clone());
+        match &r {
+            // Copy and Cut from the ribbon, menus, the slide's context menu or the control channel
+            // put the text on the system clipboard, as Ctrl+C and Ctrl+X do (#431).
+            Ok(v) if matches!(id, "edit.copy" | "edit.cut") => {
+                if let Some(t) = v.get("text").and_then(Value::as_str) {
+                    self.pending_copy = Some(t.to_string());
+                }
+            }
+            Ok(_) => {}
+            Err(e) => self.set_status(e.clone()),
         }
         self.drain_requests();
         r
@@ -985,6 +996,9 @@ impl SlideApp {
         for url in std::mem::take(&mut self.pending_urls) {
             ctx.open_url(egui::OpenUrl::new_tab(url));
         }
+        if let Some(t) = self.pending_copy.take() {
+            ctx.copy_text(t);
+        }
         self.drain_requests();
         self.perf.frame_ms = now_ms() - t0;
     }
@@ -1408,4 +1422,42 @@ mod tests {
         harness.run_steps(3);
         assert_eq!(harness.state().textures.canvas_renders, n, "an unchanged slide isn't rendered again");
     }
+
+    /// #431: the ribbon's Copy and Cut, the slide's context menu, the menus and the control
+    /// channel all run the commands; they put the text on the system clipboard, as Ctrl+C and
+    /// Ctrl+X do.
+    #[test]
+    fn copy_and_cut_commands_reach_the_system_clipboard() {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        let copied = |h: &egui_kittest::Harness<'_, SlideApp>| {
+            h.output().platform_output.commands.iter().find_map(|c| match c {
+                egui::OutputCommand::CopyText(t) => Some(t.clone()),
+                _ => None,
+            })
+        };
+        let title = harness.state().session.active().unwrap().doc.slides[0].shapes[0].id.0;
+        harness.state_mut().session.execute("text.edit", &json!({"id": title})).unwrap();
+        harness.state_mut().session.type_text("Aurora").unwrap();
+        harness.state_mut().session.key("Escape", Mods::default()).unwrap();
+        harness.run_steps(1);
+        assert_eq!(copied(&harness), None);
+
+        harness.state_mut().run("edit.copy", json!({})).unwrap();
+        harness.run_steps(1);
+        assert_eq!(copied(&harness).as_deref(), Some("Aurora"), "Copy puts the text on the clipboard");
+        harness.run_steps(1);
+        assert_eq!(copied(&harness), None, "only once");
+
+        harness.state_mut().run("edit.cut", json!({})).unwrap();
+        harness.run_steps(1);
+        assert_eq!(copied(&harness).as_deref(), Some("Aurora"), "Cut does too");
+        assert!(harness.state().session.active().unwrap().doc.slides[0].shapes.iter().all(|s| s.id.0 != title), "and removes the shape");
+    }
 }

From 1be57fee4bf1956a26396ad31c3fb367b1b37a68 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 19:59:48 +0300
Subject: [PATCH 118/376] H.264: bound frame_num gap work and reject gaps the
 SPS forbids (#427)

---
 crates/h264/src/decoder.rs     |   3 +
 crates/h264/src/dpb.rs         | 116 +++++++++++++++++++++++++++++++++
 crates/h264/src/synth_tests.rs |  30 +++++++++
 3 files changed, 149 insertions(+)

diff --git a/crates/h264/src/decoder.rs b/crates/h264/src/decoder.rs
index 5f8941ea..352e3487 100644
--- a/crates/h264/src/decoder.rs
+++ b/crates/h264/src/decoder.rs
@@ -446,6 +446,9 @@ impl Decoder {
         } else {
             let max = sps.max_frame_num();
             if sh.frame_num != self.prev_ref_frame_num && sh.frame_num != (self.prev_ref_frame_num + 1) % max {
+                // A gap is only legal when the SPS allows it (7.4.2.1.1); otherwise the stream is broken
+                // and filling it would only cost work, so the picture is rejected.
+                ensure!(sps.gaps_in_frame_num_allowed, "frame_num gap in a stream that does not allow gaps");
                 // frame_num gap (8.2.5.2): insert "non-existing" frames. Their samples are never used by
                 // conforming streams; copy the latest decoded frame for concealment.
                 let meta = Arc::new(output_meta(sps, pts, false));
diff --git a/crates/h264/src/dpb.rs b/crates/h264/src/dpb.rs
index cb064335..5662e299 100644
--- a/crates/h264/src/dpb.rs
+++ b/crates/h264/src/dpb.rs
@@ -133,7 +133,27 @@ impl Dpb {
         make_frame: &mut dyn FnMut(u32) -> (FrameRef, Arc<OutputMeta>),
         poc_state: &mut dyn FnMut(u32),
     ) {
+        if max_frame_num == 0 {
+            return;
+        }
         let mut unused = (prev_ref_frame_num + 1) % max_frame_num;
+        // Only the last `max_num_ref_frames` "non-existing" frames can survive the sliding window, and
+        // inserting more than that evicts every earlier short-term reference. Skip straight to that tail
+        // (keeping the POC state walk for every missing frame_num) so a hostile gap of up to 65535
+        // frames costs at most `max_num_ref_frames` frame allocations instead of one per missing frame.
+        let gap = frame_num.wrapping_add(max_frame_num).wrapping_sub(unused) % max_frame_num;
+        let keep = u32::try_from(max_num_ref_frames.max(1)).unwrap_or(u32::MAX);
+        let skip = gap.saturating_sub(keep);
+        if skip > 0 {
+            for e in self.entries.iter_mut().filter(|e| e.mark == RefMark::Short) {
+                e.mark = RefMark::Unused;
+            }
+            self.prune();
+            for _ in 0..skip {
+                poc_state(unused);
+                unused = (unused + 1) % max_frame_num;
+            }
+        }
         let mut guard = 0;
         while unused != frame_num && guard < max_frame_num {
             self.sliding_window(unused, max_frame_num, max_num_ref_frames);
@@ -418,3 +438,99 @@ impl Default for Dpb {
         Self::new()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::picture::Frame;
+
+    fn meta() -> Arc<OutputMeta> {
+        Arc::new(OutputMeta {
+            pts: 0,
+            key: false,
+            crop: (0, 0, 0, 0),
+            full_range: false,
+            colour_primaries: 2,
+            transfer_characteristics: 2,
+            matrix_coefficients: 2,
+            sar: (1, 1),
+            draft: false,
+        })
+    }
+
+    fn short(dpb: &mut Dpb, id: u32, frame_num: u32) {
+        dpb.entries.push(DpbEntry {
+            frame: Arc::new(Frame::new(id, 0, 1, 1)),
+            poc: 0,
+            frame_num,
+            long_term_frame_idx: 0,
+            mark: RefMark::Short,
+            needed_for_output: false,
+            non_existing: false,
+            meta: meta(),
+        });
+    }
+
+    /// Fill a gap and return (frames made, POC walk, reference frame_nums left in the DPB).
+    fn fill(dpb: &mut Dpb, prev: u32, cur: u32, max: u32, refs: usize) -> (u32, Vec<u32>, Vec<(u32, bool)>) {
+        let mut made = 0u32;
+        let mut walk = Vec::new();
+        let mut make = |_f: u32| {
+            made += 1;
+            (Arc::new(Frame::new(1000 + made, 0, 1, 1)), meta())
+        };
+        let mut poc = |f: u32| walk.push(f);
+        dpb.fill_frame_num_gap(prev, cur, max, refs, &mut make, &mut poc);
+        let left = dpb.entries.iter().filter(|e| e.mark != RefMark::Unused).map(|e| (e.frame_num, e.non_existing)).collect();
+        (made, walk, left)
+    }
+
+    #[test]
+    fn huge_gap_makes_only_the_frames_that_stay_referenced() {
+        let mut dpb = Dpb::new();
+        short(&mut dpb, 1, 0);
+        short(&mut dpb, 2, 1);
+        let (made, walk, left) = fill(&mut dpb, 1, 65535, 65536, 4);
+        assert_eq!(made, 4);
+        // The POC state still walks every missing frame_num, in order.
+        assert_eq!(walk.len(), 65533);
+        assert_eq!(walk.first(), Some(&2));
+        assert_eq!(walk.last(), Some(&65534));
+        assert_eq!(left, vec![(65531, true), (65532, true), (65533, true), (65534, true)]);
+    }
+
+    #[test]
+    fn huge_gap_across_wraparound_matches_the_frame_by_frame_result() {
+        let mut dpb = Dpb::new();
+        short(&mut dpb, 1, 65000);
+        let (made, walk, left) = fill(&mut dpb, 65000, 3, 65536, 2);
+        assert_eq!(made, 2);
+        assert_eq!(walk.len(), 538);
+        assert_eq!(walk.first(), Some(&65001));
+        assert_eq!(walk.last(), Some(&2));
+        assert_eq!(left, vec![(1, true), (2, true)]);
+    }
+
+    #[test]
+    fn small_gap_keeps_earlier_references() {
+        let mut dpb = Dpb::new();
+        short(&mut dpb, 1, 0);
+        short(&mut dpb, 2, 1);
+        let (made, walk, left) = fill(&mut dpb, 1, 4, 16, 4);
+        assert_eq!(made, 2);
+        assert_eq!(walk, vec![2, 3]);
+        assert_eq!(left, vec![(0, false), (1, false), (2, true), (3, true)]);
+    }
+
+    #[test]
+    fn long_term_references_survive_a_huge_gap() {
+        let mut dpb = Dpb::new();
+        short(&mut dpb, 1, 0);
+        if let Some(e) = dpb.entries.last_mut() {
+            e.mark = RefMark::Long;
+        }
+        let (made, _, left) = fill(&mut dpb, 0, 1000, 1024, 3);
+        assert!(made <= 3);
+        assert_eq!(left, vec![(0, false), (998, true), (999, true)]);
+    }
+}
diff --git a/crates/h264/src/synth_tests.rs b/crates/h264/src/synth_tests.rs
index b0e0d5d0..8f66cf14 100644
--- a/crates/h264/src/synth_tests.rs
+++ b/crates/h264/src/synth_tests.rs
@@ -539,3 +539,33 @@ fn poc_type1_reordering() {
         }
     }
 }
+
+fn gap_stream(gaps: bool) -> Vec<u8> {
+    let mut seed = 7u32;
+    let a: Vec<Option<Vec<u8>>> = (0..NMB).map(|_| Some(random_mb(&mut seed))).collect();
+    let mut stream = sps(66, 2, gaps, PocType::T2);
+    stream.extend(pps(false, false));
+    stream.extend(slice_nal(&Pic { idr: true, frame_num: 0, ref_idc: 3, mbs: a, ..Default::default() }, false));
+    // frame_num 1..=9 are missing.
+    stream.extend(slice_nal(&Pic { frame_num: 10, ref_idc: 2, mbs: vec![None; NMB], ..Default::default() }, false));
+    stream
+}
+
+#[test]
+fn frame_num_gap_is_rejected_when_the_sps_forbids_gaps() {
+    let mut dec = Decoder::with_threads(1);
+    let res = dec.decode(&gap_stream(false), 0);
+    let _ = dec.flush();
+    assert!(res.is_err() || dec.take_error().is_some(), "a forbidden gap must be reported");
+    assert_eq!(dec.stats().frame_num_gaps, 0);
+}
+
+#[test]
+fn frame_num_gap_is_filled_when_the_sps_allows_gaps() {
+    let mut dec = Decoder::with_threads(1);
+    let mut out = dec.decode(&gap_stream(true), 0).unwrap();
+    out.extend(dec.flush());
+    assert!(dec.take_error().is_none());
+    assert_eq!(out.len(), 2);
+    assert_eq!(dec.stats().frame_num_gaps, 1);
+}

From 6873a25635641500a8e525f63c8c63e0887a4aa2 Mon Sep 17 00:00:00 2001
From: Nikita <nnn93@mail.ru>
Date: Tue, 13 Oct 2026 20:16:51 +0300
Subject: [PATCH 119/376] Codecs: a hostile number is a format error, not an
 overflow

H.264 and HEVC quantiser offsets, Matroska block times, Opus granule timing and QuickTime PCM frame sizes are range-checked before the arithmetic.
---
 ROADMAP.md                             |  4 +-
 crates/h264/src/params.rs              | 73 +++++++++++++++++++++++++-
 crates/h264/src/slice.rs               |  4 +-
 crates/hevc/src/params.rs              | 50 +++++++++++++++++-
 crates/hevc/src/slice.rs               |  9 ++--
 crates/hevc/src/slicedec.rs            |  2 +-
 crates/isobmff/src/codec.rs            | 60 ++++++++++++++++++---
 crates/isobmff/src/demux.rs            | 11 ++--
 crates/isobmff/src/mux.rs              |  5 +-
 crates/matroska/src/demux.rs           | 17 ++++--
 crates/matroska/src/synthetic_tests.rs | 39 ++++++++++++++
 crates/media/src/audio.rs              |  2 +-
 crates/media/src/probe.rs              |  2 +-
 crates/ogg/src/lib.rs                  | 40 ++++++++++----
 crates/ogg/src/tests.rs                | 25 +++++++--
 15 files changed, 299 insertions(+), 44 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..6dace4b7 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (progress log: codec parsers reject overflowing numeric fields, #426; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Codec parsers (#426): H.264 and HEVC quantiser offsets, Matroska block times, Opus granule timing and QuickTime PCM frame sizes are range-checked before the arithmetic, so a hostile number is a format error instead of an overflow |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: codec parsers reject overflowing numeric fields (#426) |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/h264/src/params.rs b/crates/h264/src/params.rs
index a7e35d73..461d316b 100644
--- a/crates/h264/src/params.rs
+++ b/crates/h264/src/params.rs
@@ -559,6 +559,12 @@ pub struct Pps {
     pub scaling: ScalingMatrices,
 }
 
+/// `26 + minus26`, after `minus26` is inside −(26 + QpBdOffset) ..= 25.
+fn qp_plus_26(minus26: i32, qp_bd: i32, name: &str) -> Result<i32> {
+    ensure!((-(26 + qp_bd)..=25).contains(&minus26), "{name} out of range");
+    Ok(26 + minus26)
+}
+
 impl Pps {
     /// Parse a PPS. Needs the SPS table because the tail depends on chroma_format_idc.
     pub fn parse(rbsp: &[u8], spss: &[Option<Sps>]) -> Result<Pps> {
@@ -610,8 +616,11 @@ impl Pps {
         ensure!(num_ref_idx_l0_default_active <= 32 && num_ref_idx_l1_default_active <= 32, "num_ref_idx_default_active out of range");
         let weighted_pred = r.read_flag()?;
         let weighted_bipred_idc = r.read_bits(2)?;
-        let pic_init_qp = 26 + r.read_se()?;
-        let pic_init_qs = 26 + r.read_se()?;
+        // pic_init_qp_minus26 is −(26 + QpBdOffsetY) ..= 25. Check that before adding 26: a hostile
+        // Exp-Golomb value overflows the addition in debug builds.
+        let qp_bd = 6 * sps.bit_depth_luma.saturating_sub(8) as i32;
+        let pic_init_qp = qp_plus_26(r.read_se()?, qp_bd, "pic_init_qp_minus26")?;
+        let pic_init_qs = qp_plus_26(r.read_se()?, qp_bd, "pic_init_qs_minus26")?;
         let chroma_qp_index_offset = r.read_se()?;
         ensure!((-12..=12).contains(&chroma_qp_index_offset), "chroma_qp_index_offset out of range");
         let deblocking_filter_control_present = r.read_flag()?;
@@ -751,4 +760,64 @@ mod tests {
         assert!(Sps::parse(&sps_with(10, Some([0x8000_0000, 0, 0, 0]))).is_err());
         assert!(Sps::parse(&sps_with(10, Some([1, 1, 1, 1]))).is_ok());
     }
+
+    fn pps_bits(qp_minus26: i32, qs_minus26: i32) -> Vec<u8> {
+        let mut w = BitWriter::new();
+        w.write_ue(0);
+        w.write_ue(0);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_ue(0);
+        w.write_ue(0);
+        w.write_ue(0);
+        w.write_bit(false);
+        w.write_bits(0, 2);
+        w.write_se(qp_minus26);
+        w.write_se(qs_minus26);
+        w.write_se(0);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.rbsp_trailing();
+        w.finish()
+    }
+
+    fn sps_table() -> Vec<Option<Sps>> {
+        vec![Sps::parse(&sps_with(10, None)).ok()]
+    }
+
+    #[test]
+    fn pic_init_qp_is_checked_before_adding_26() {
+        let table = sps_table();
+        assert_eq!(Pps::parse(&pps_bits(0, 0), &table).unwrap().pic_init_qp, 26);
+        assert_eq!(Pps::parse(&pps_bits(25, 0), &table).unwrap().pic_init_qp, 51);
+        assert_eq!(Pps::parse(&pps_bits(-26, 0), &table).unwrap().pic_init_qp, 0);
+        assert!(Pps::parse(&pps_bits(26, 0), &table).is_err());
+        assert!(Pps::parse(&pps_bits(-27, 0), &table).is_err());
+        assert!(Pps::parse(&pps_bits(i32::MAX, 0), &table).is_err());
+        assert!(Pps::parse(&pps_bits(0, i32::MAX), &table).is_err());
+    }
+
+    #[test]
+    fn slice_qp_addition_does_not_overflow() {
+        let table = sps_table();
+        let pps = Pps::parse(&pps_bits(0, 0), &table).unwrap();
+        let sps = table[0].clone().unwrap();
+        let nal = crate::slice::NalHeader { nal_ref_idc: 0, nal_unit_type: crate::slice::nal_type::SLICE };
+        let rbsp = |delta: i32| {
+            let mut w = BitWriter::new();
+            w.write_ue(0);
+            w.write_ue(2); // I
+            w.write_ue(0);
+            w.write_bits(0, sps.log2_max_frame_num);
+            w.write_se(delta);
+            w.rbsp_trailing();
+            w.finish()
+        };
+        let parse = |delta: i32| crate::slice::SliceHeader::parse(&rbsp(delta), nal, |_| Ok((&pps, table[0].as_ref().unwrap())));
+        let (sh, _, _) = parse(0).unwrap();
+        assert_eq!(sh.qp(&pps), 26);
+        assert!(parse(26).is_err());
+        assert!(parse(i32::MAX).is_err());
+    }
 }
diff --git a/crates/h264/src/slice.rs b/crates/h264/src/slice.rs
index f53edbfd..e1cad290 100644
--- a/crates/h264/src/slice.rs
+++ b/crates/h264/src/slice.rs
@@ -144,7 +144,7 @@ pub struct SliceHeader {
 
 impl SliceHeader {
     pub fn qp(&self, pps: &Pps) -> i32 {
-        pps.pic_init_qp + self.slice_qp_delta
+        pps.pic_init_qp.saturating_add(self.slice_qp_delta)
     }
     pub fn has_mmco5(&self) -> bool {
         self.mmcos.iter().any(|m| m.op == 5)
@@ -315,7 +315,7 @@ impl SliceHeader {
             ensure!(cabac_init_idc <= 2, "cabac_init_idc out of range");
         }
         let slice_qp_delta = r.read_se()?;
-        let qp = pps.pic_init_qp + slice_qp_delta;
+        let qp = pps.pic_init_qp.checked_add(slice_qp_delta).ok_or_else(|| crate::Error::Invalid("slice QP out of range".into()))?;
         ensure!((0..=51).contains(&qp), "slice QP {qp} out of range");
         let mut sp_for_switch = false;
         let mut slice_qs_delta = 0;
diff --git a/crates/hevc/src/params.rs b/crates/hevc/src/params.rs
index 0044a6ac..d6eda61b 100644
--- a/crates/hevc/src/params.rs
+++ b/crates/hevc/src/params.rs
@@ -726,7 +726,11 @@ impl Pps {
         let num_ref_idx_l0_default = r.read_ue_plus(1)?;
         let num_ref_idx_l1_default = r.read_ue_plus(1)?;
         ensure!(num_ref_idx_l0_default <= 15 && num_ref_idx_l1_default <= 15, "num_ref_idx_default_active out of range");
-        let init_qp = 26 + r.read_se()?;
+        // init_qp_minus26 is −(26 + QpBdOffsetY) ..= 25. Bit depth is not known here (no SPS), so the
+        // widest legal window is 16-bit (QpBdOffsetY = 48). Reject before adding 26.
+        let init_qp_minus26 = r.read_se()?;
+        ensure!((-74..=25).contains(&init_qp_minus26), "init_qp_minus26 out of range");
+        let init_qp = 26 + init_qp_minus26;
         let constrained_intra_pred = r.read_flag()?;
         let transform_skip = r.read_flag()?;
         let cu_qp_delta_enabled = r.read_flag()?;
@@ -999,4 +1003,48 @@ mod tests {
             assert!(StRps::parse(&mut BitReader::new(&b), 0, &[], 1).is_err(), "ue {ue:#x}");
         }
     }
+
+    fn pps_bits(init_qp_minus26: i32) -> Vec<u8> {
+        let mut w = BitWriter::new();
+        w.write_ue(0);
+        w.write_ue(0);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_bits(0, 3);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_ue(0);
+        w.write_ue(0);
+        w.write_se(init_qp_minus26);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_se(0);
+        w.write_se(0);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_bit(false);
+        w.write_bit(true); // loop filter across slices
+        w.write_bit(false); // deblocking
+        w.write_bit(false); // scaling list
+        w.write_bit(false);
+        w.write_ue(0); // log2_parallel_merge_level_minus2
+        w.write_bit(false);
+        w.write_bit(false);
+        w.rbsp_trailing();
+        w.finish()
+    }
+
+    #[test]
+    fn init_qp_is_checked_before_adding_26() {
+        assert_eq!(Pps::parse(&pps_bits(0)).unwrap().init_qp, 26);
+        assert_eq!(Pps::parse(&pps_bits(25)).unwrap().init_qp, 51);
+        assert_eq!(Pps::parse(&pps_bits(-74)).unwrap().init_qp, -48);
+        assert!(Pps::parse(&pps_bits(26)).is_err());
+        assert!(Pps::parse(&pps_bits(-75)).is_err());
+        assert!(Pps::parse(&pps_bits(i32::MAX)).is_err());
+    }
 }
diff --git a/crates/hevc/src/slice.rs b/crates/hevc/src/slice.rs
index c7bd1e39..d6fc439a 100644
--- a/crates/hevc/src/slice.rs
+++ b/crates/hevc/src/slice.rs
@@ -339,7 +339,7 @@ impl SliceHeader {
                 sh.max_num_merge_cand = 5 - five_minus;
             }
             sh.qp_delta = r.read_se()?;
-            let qp = pps.init_qp + sh.qp_delta;
+            let qp = pps.init_qp.checked_add(sh.qp_delta).ok_or_else(|| crate::Error::Invalid("SliceQpY out of range".into()))?;
             let qp_bd = 6 * (sps.bit_depth_luma as i32 - 8);
             ensure!((-qp_bd..=51).contains(&qp), "SliceQpY {qp} out of range");
             if pps.slice_chroma_qp_offsets_present {
@@ -368,7 +368,8 @@ impl SliceHeader {
                 let len = r.read_ue_plus(1)?;
                 ensure!(len <= 32, "offset_len_minus1 out of range");
                 for _ in 0..n {
-                    sh.entry_points.push(r.read_bits(len)? + 1);
+                    let off = r.read_bits(len)?.checked_add(1).ok_or_else(|| crate::Error::Invalid("entry_point_offset out of range".into()))?;
+                    sh.entry_points.push(off);
                 }
             }
         }
@@ -391,7 +392,9 @@ fn parse_pwt(r: &mut BitReader, sh: &SliceHeader, sps: &Sps) -> Result<PredWeigh
     ensure!(t.luma_log2_denom <= 7, "luma_log2_weight_denom out of range");
     let chroma = sps.chroma_array_type() != 0;
     if chroma {
-        let d = t.luma_log2_denom as i32 + r.read_se()?;
+        let delta = r.read_se()?;
+        ensure!((-7..=7).contains(&delta), "delta_chroma_log2_weight_denom out of range");
+        let d = t.luma_log2_denom as i32 + delta;
         ensure!((0..=7).contains(&d), "ChromaLog2WeightDenom out of range");
         t.chroma_log2_denom = d as u32;
     }
diff --git a/crates/hevc/src/slicedec.rs b/crates/hevc/src/slicedec.rs
index db5b46db..fb83ccb6 100644
--- a/crates/hevc/src/slicedec.rs
+++ b/crates/hevc/src/slicedec.rs
@@ -298,7 +298,7 @@ impl<'a> SliceDecoder<'a> {
         let sh = &job.sh;
         let (sps, pps) = (&*job.sps, &*job.pps);
         ensure!(sh.data_offset < job.rbsp.len(), "empty slice segment data");
-        let slice_qp = pps.init_qp + sh.qp_delta;
+        let slice_qp = pps.init_qp.checked_add(sh.qp_delta).ok_or_else(|| crate::Error::Invalid("SliceQpY out of range".into()))?;
         let init_type = match sh.slice_type {
             SliceType::I => 0,
             SliceType::P => {
diff --git a/crates/isobmff/src/codec.rs b/crates/isobmff/src/codec.rs
index 4f132941..71580c60 100644
--- a/crates/isobmff/src/codec.rs
+++ b/crates/isobmff/src/codec.rs
@@ -1,7 +1,7 @@
 //! Sample entries (`stsd` children) and codec configuration records: parsing and serialization.
 
 use crate::bytes::{BoxBuf, Cur, FourCc, boxes};
-use crate::error::{Error, Result};
+use crate::error::{Error, Result, invalid};
 use deckcraft_bitstream::BitReader;
 
 /// One sample description (an entry of `stsd`).
@@ -606,8 +606,9 @@ pub struct PcmConfig {
 
 impl PcmConfig {
     /// Bytes per interleaved audio frame (all channels).
-    pub fn bytes_per_frame(&self) -> u32 {
-        (self.bits as u32).div_ceil(8) * self.channels.max(1)
+    /// `None` when `channels` times the bytes per sample does not fit in `u32`.
+    pub fn bytes_per_frame(&self) -> Option<u32> {
+        u32::from(self.bits).div_ceil(8).checked_mul(self.channels.max(1))
     }
 }
 
@@ -888,6 +889,9 @@ pub(crate) fn parse_sample_entry(format: FourCc, payload: &[u8], handler: FourCc
             let _size_of_struct = c.u32()?;
             a.sample_rate = c.f64()?;
             a.channels = c.u32()?;
+            if a.channels > u32::from(u16::MAX) {
+                return invalid("channel count out of range");
+            }
             let _always = c.u32()?;
             a.const_bits_per_channel = c.u32()?;
             a.lpcm_flags = c.u32()?;
@@ -931,7 +935,7 @@ pub(crate) fn parse_sample_entry(format: FourCc, payload: &[u8], handler: FourCc
             },
             b"ac-3" => CodecConfig::Ac3 { dac3: get(b"dac3").unwrap_or(&[]).to_vec() },
             b"ec-3" => CodecConfig::Eac3 { dec3: get(b"dec3").unwrap_or(&[]).to_vec() },
-            b"lpcm" | b"sowt" | b"twos" | b"in24" | b"in32" | b"fl32" | b"fl64" | b"raw " | b"NONE" => CodecConfig::Pcm(qt_pcm(f, &a)),
+            b"lpcm" | b"sowt" | b"twos" | b"in24" | b"in32" | b"fl32" | b"fl64" | b"raw " | b"NONE" => CodecConfig::Pcm(qt_pcm(f, &a)?),
             b"ipcm" | b"fpcm" => {
                 let mut pcm = PcmConfig {
                     bits: a.sample_size,
@@ -948,6 +952,9 @@ pub(crate) fn parse_sample_entry(format: FourCc, payload: &[u8], handler: FourCc
                     pcm.big_endian = flags & 1 == 0;
                     pcm.bits = c.u8()? as u16;
                 }
+                if pcm.bytes_per_frame().is_none() {
+                    return invalid("PCM frame size overflows");
+                }
                 CodecConfig::Pcm(pcm)
             }
             _ => unknown(),
@@ -957,11 +964,11 @@ pub(crate) fn parse_sample_entry(format: FourCc, payload: &[u8], handler: FourCc
     Ok(SampleEntry { format, data_reference_index, codec: unknown(), video: None, audio: None, bitrate: None })
 }
 
-fn qt_pcm(f: &[u8; 4], a: &AudioParams) -> PcmConfig {
+fn qt_pcm(f: &[u8; 4], a: &AudioParams) -> Result<PcmConfig> {
     let mut p = PcmConfig { channels: a.channels, sample_rate: a.sample_rate, signed: true, ..Default::default() };
     match f {
         b"lpcm" => {
-            p.bits = a.const_bits_per_channel as u16;
+            p.bits = u16::try_from(a.const_bits_per_channel).map_err(|_| Error::Invalid("const_bits_per_channel out of range".into()))?;
             p.float = a.lpcm_flags & 1 != 0;
             p.big_endian = a.lpcm_flags & 2 != 0;
             p.signed = a.lpcm_flags & 4 != 0 || p.float;
@@ -992,7 +999,10 @@ fn qt_pcm(f: &[u8; 4], a: &AudioParams) -> PcmConfig {
         }
         _ => {}
     }
-    p
+    if p.bytes_per_frame().is_none() {
+        return invalid("PCM frame size overflows");
+    }
+    Ok(p)
 }
 
 fn parse_btrt(p: &[u8]) -> Result<BitRate> {
@@ -1360,7 +1370,7 @@ impl SampleEntry {
             b.u32(p.bits as u32);
             let flags = (p.float as u32) | ((p.big_endian as u32) << 1) | (((p.signed && !p.float) as u32) << 2) | 8;
             b.u32(flags);
-            b.u32(p.bytes_per_frame());
+            b.u32(p.bytes_per_frame().unwrap_or(0));
             b.u32(1);
         } else {
             b.u16(version);
@@ -1536,6 +1546,40 @@ mod tests {
         assert_eq!(roundtrip(&e, true, b"soun"), e);
     }
 
+    fn qt_v2_lpcm(channels: u32, bits: u32) -> Vec<u8> {
+        let mut p = vec![0; 6];
+        let u16b = |p: &mut Vec<u8>, v: u16| p.extend(v.to_be_bytes());
+        let u32b = |p: &mut Vec<u8>, v: u32| p.extend(v.to_be_bytes());
+        u16b(&mut p, 1);
+        u16b(&mut p, 2);
+        u16b(&mut p, 0);
+        u32b(&mut p, 0);
+        u16b(&mut p, 2);
+        u16b(&mut p, 16);
+        u16b(&mut p, 0);
+        u16b(&mut p, 0);
+        u32b(&mut p, 65536);
+        u32b(&mut p, 72);
+        p.extend(48000.0f64.to_be_bytes());
+        u32b(&mut p, channels);
+        u32b(&mut p, 0);
+        u32b(&mut p, bits);
+        u32b(&mut p, 0);
+        u32b(&mut p, 0);
+        u32b(&mut p, 1);
+        p
+    }
+
+    #[test]
+    fn pcm_frame_size_rejects_a_hostile_channel_count() {
+        assert_eq!(PcmConfig { bits: 16, channels: 2, sample_rate: 48000.0, ..Default::default() }.bytes_per_frame(), Some(4));
+        assert!(PcmConfig { bits: 16, channels: u32::MAX, ..Default::default() }.bytes_per_frame().is_none());
+        assert!(parse_sample_entry(FourCc(*b"lpcm"), &qt_v2_lpcm(u32::MAX, 16), FourCc(*b"soun"), true).is_err());
+        assert!(parse_sample_entry(FourCc(*b"lpcm"), &qt_v2_lpcm(2, u32::MAX), FourCc(*b"soun"), true).is_err());
+        let ok = parse_sample_entry(FourCc(*b"lpcm"), &qt_v2_lpcm(2, 16), FourCc(*b"soun"), true).unwrap();
+        assert!(matches!(ok.codec, CodecConfig::Pcm(p) if p.bytes_per_frame() == Some(4)));
+    }
+
     #[test]
     fn pcm_entries() {
         for (bits, float, be, qt) in [
diff --git a/crates/isobmff/src/demux.rs b/crates/isobmff/src/demux.rs
index dc9e7647..ee8eb473 100644
--- a/crates/isobmff/src/demux.rs
+++ b/crates/isobmff/src/demux.rs
@@ -699,13 +699,14 @@ fn parse_stbl(stbl: &[u8], t: &mut Track, is_qt: bool, file_len: u64) -> Result<
     if let Some(p) = pcm {
         t.pcm_chunked = true;
         let a = t.audio().cloned().unwrap_or_default();
-        let frame_bytes = |frames: u64| -> u64 {
+        let bpf = p.bytes_per_frame().ok_or_else(|| Error::Invalid("PCM frame size overflows".into()))?;
+        let frame_bytes = |frames: u64| -> Option<u64> {
             if a.qt_version == 1 && a.bytes_per_frame > 0 && a.samples_per_packet > 0 {
-                frames / a.samples_per_packet as u64 * a.bytes_per_frame as u64
+                frames.checked_div(u64::from(a.samples_per_packet))?.checked_mul(u64::from(a.bytes_per_frame))
             } else if const_size > 1 {
-                frames * const_size as u64
+                frames.checked_mul(u64::from(const_size))
             } else {
-                frames * p.bytes_per_frame() as u64
+                frames.checked_mul(u64::from(bpf))
             }
         };
         if chunks.len() > MAX_SAMPLES {
@@ -721,7 +722,7 @@ fn parse_stbl(stbl: &[u8], t: &mut Track, is_qt: bool, file_len: u64) -> Result<
                 continue;
             }
             let dur = stts_c.take(spc as u64);
-            let size = frame_bytes(spc as u64).min(u32::MAX as u64) as u32;
+            let size = frame_bytes(spc as u64).ok_or_else(|| Error::Invalid("PCM sample size overflows".into()))?.min(u64::from(u32::MAX)) as u32;
             samples.push(Sample {
                 offset: off,
                 size,
diff --git a/crates/isobmff/src/mux.rs b/crates/isobmff/src/mux.rs
index f3a062b5..bf9a4cbf 100644
--- a/crates/isobmff/src/mux.rs
+++ b/crates/isobmff/src/mux.rs
@@ -498,7 +498,10 @@ fn validate_track(cfg: &TrackConfig) -> Result<Option<u32>> {
         if (p.sample_rate - cfg.timescale as f64).abs() > 0.5 {
             return Err(Error::Mux("PCM track timescale must equal the sample rate".into()));
         }
-        return Ok(Some(p.bytes_per_frame()));
+        let Some(n) = p.bytes_per_frame() else {
+            return Err(Error::Mux("PCM frame size overflows".into()));
+        };
+        return Ok(Some(n));
     }
     Ok(None)
 }
diff --git a/crates/matroska/src/demux.rs b/crates/matroska/src/demux.rs
index 7d5241b4..66dfe177 100644
--- a/crates/matroska/src/demux.rs
+++ b/crates/matroska/src/demux.rs
@@ -354,6 +354,15 @@ fn parse_block<S: ByteSource + ?Sized>(
     Ok(Some((track, rel, flags, frames)))
 }
 
+/// Cluster timestamps are unsigned and must fit in `i64` before a signed block offset is added.
+fn cluster_timestamp(raw: u64) -> Result<i64> {
+    i64::try_from(raw).map_err(|_| Error::Invalid("cluster timestamp out of range".into()))
+}
+
+fn block_timestamp(cluster_ts: i64, rel: i16) -> Result<i64> {
+    cluster_ts.checked_add(i64::from(rel)).ok_or_else(|| Error::Invalid("block timestamp overflow".into()))
+}
+
 /// Parse one SimpleBlock or BlockGroup element.
 fn parse_block_elem<S: ByteSource + ?Sized>(
     io: &mut Io<'_, S>,
@@ -369,7 +378,7 @@ fn parse_block_elem<S: ByteSource + ?Sized>(
             Ok(Some(BlockRef {
                 track,
                 block_offset: h.pos,
-                ts: cluster_ts + rel as i64,
+                ts: block_timestamp(cluster_ts, rel)?,
                 frames,
                 block_duration: None,
                 keyframe: flags & 0x80 != 0,
@@ -398,7 +407,7 @@ fn parse_block_elem<S: ByteSource + ?Sized>(
             Ok(Some(BlockRef {
                 track,
                 block_offset: h.pos,
-                ts: cluster_ts + rel as i64,
+                ts: block_timestamp(cluster_ts, rel)?,
                 frames,
                 block_duration: dur,
                 keyframe: !has_ref,
@@ -492,7 +501,7 @@ fn scan_cluster<S: ByteSource + ?Sized>(
         }
         let ce = c.end(lim);
         match c.id {
-            TIMESTAMP => ts = ebml::uint(io.peek(c.data_start(), (ce - c.data_start()) as usize)?) as i64,
+            TIMESTAMP => ts = cluster_timestamp(ebml::uint(io.peek(c.data_start(), (ce - c.data_start()) as usize)?))?,
             SIMPLE_BLOCK | BLOCK_GROUP => {
                 if let Some(b) = parse_block_elem(io, &c, ce, ts, &lookup)? {
                     blocks.push(b);
@@ -1104,7 +1113,7 @@ impl<S: ByteSource> Demuxer<S> {
                 self.pos = he;
                 match h.id {
                     TIMESTAMP => {
-                        let v = ebml::uint(io.peek(h.data_start(), (he - h.data_start()) as usize)?) as i64;
+                        let v = cluster_timestamp(ebml::uint(io.peek(h.data_start(), (he - h.data_start()) as usize)?))?;
                         self.cluster = Some(InCluster { ts: v, end: c.end });
                     }
                     SIMPLE_BLOCK | BLOCK_GROUP => {
diff --git a/crates/matroska/src/synthetic_tests.rs b/crates/matroska/src/synthetic_tests.rs
index e267f8c4..0ed86e4c 100644
--- a/crates/matroska/src/synthetic_tests.rs
+++ b/crates/matroska/src/synthetic_tests.rs
@@ -213,3 +213,42 @@ fn synthetic_file() {
     assert_eq!(d.next_packet().unwrap().unwrap().pts, 1120);
     assert!(d.file().indexed);
 }
+
+fn one_block(ts: u64, rel: i16) -> Vec<u8> {
+    let mut f = Vec::new();
+    let mut h = Vec::new();
+    el_str(&mut h, DOC_TYPE, "matroska");
+    el(&mut f, EBML, &h);
+    write_id(&mut f, SEGMENT);
+    write_unknown_size(&mut f, 8);
+    let mut info = Vec::new();
+    el_uint(&mut info, TIMESTAMP_SCALE, 1_000_000);
+    el(&mut f, INFO, &info);
+    let mut v = Vec::new();
+    el_uint(&mut v, TRACK_NUMBER, 1);
+    el_uint(&mut v, TRACK_UID, 1);
+    el_uint(&mut v, TRACK_TYPE, 1);
+    el_str(&mut v, CODEC_ID, "V_UNCOMPRESSED");
+    let mut tr = Vec::new();
+    el(&mut tr, TRACK_ENTRY, &v);
+    el(&mut f, TRACKS, &tr);
+    write_id(&mut f, CLUSTER);
+    write_unknown_size(&mut f, 8);
+    el_uint(&mut f, TIMESTAMP, ts);
+    el(&mut f, SIMPLE_BLOCK, &block(1, rel, 0x80, &[0]));
+    f
+}
+
+#[test]
+fn block_timestamp_addition_does_not_overflow() {
+    let bytes = one_block(1000, 5);
+    let d = Demuxer::from_slice(&bytes).unwrap();
+    let p: Vec<Packet> = d.map(|p| p.unwrap()).collect();
+    assert_eq!(p[0].pts, 1005);
+    let edge = one_block(i64::MAX as u64, 0);
+    let d = Demuxer::from_slice(&edge).unwrap();
+    let p: Vec<Packet> = d.map(|p| p.unwrap()).collect();
+    assert_eq!(p[0].pts, i64::MAX);
+    assert!(Demuxer::from_slice(&one_block(i64::MAX as u64, 1)).is_err());
+    assert!(Demuxer::from_slice(&one_block(u64::MAX, 0)).is_err());
+}
diff --git a/crates/media/src/audio.rs b/crates/media/src/audio.rs
index 80ad66a4..d212c1fe 100644
--- a/crates/media/src/audio.rs
+++ b/crates/media/src/audio.rs
@@ -92,7 +92,7 @@ fn decode_ogg_opus(bytes: &Bytes) -> Option<Result<Pcm>> {
         let mut dec = deckcraft_opus::Decoder::new(head).map_err(|e| MediaError::Corrupt(e.to_string()))?;
         dec.set_trim_pre_skip(true);
         let channels = dec.channels() as u16;
-        let timing = deckcraft_ogg::OpusTiming::of(stream, dec.pre_skip() as u32);
+        let timing = deckcraft_ogg::OpusTiming::of(stream, dec.pre_skip() as u32).map_err(|e| MediaError::Corrupt(e.to_string()))?;
         let mut out = Vec::new();
         for i in 0..stream.packets.len() {
             let Ok(p) = file.read_packet(src, s, i) else { continue };
diff --git a/crates/media/src/probe.rs b/crates/media/src/probe.rs
index 80a8a380..2070b8c9 100644
--- a/crates/media/src/probe.rs
+++ b/crates/media/src/probe.rs
@@ -170,7 +170,7 @@ fn probe_ogg(bytes: &Bytes) -> Option<MediaInfo> {
     let s = f.stream_of(deckcraft_ogg::Codec::Opus)?;
     let st = f.streams.get(s)?;
     let head = deckcraft_opus::OpusHead::parse(st.headers.first()?).ok()?;
-    let timing = deckcraft_ogg::OpusTiming::of(st, head.pre_skip as u32);
+    let timing = deckcraft_ogg::OpusTiming::of(st, head.pre_skip as u32).ok()?;
     Some(MediaInfo {
         container: "ogg",
         duration_ms: ms(timing.total as f64 / 48_000.0),
diff --git a/crates/ogg/src/lib.rs b/crates/ogg/src/lib.rs
index 6100fd4c..7342574e 100644
--- a/crates/ogg/src/lib.rs
+++ b/crates/ogg/src/lib.rs
@@ -414,9 +414,20 @@ pub struct OpusTiming {
     pub total: i64,
 }
 
+fn timing_add(a: i64, b: i64) -> Result<i64> {
+    a.checked_add(b).ok_or_else(|| Error::Invalid("opus timing overflow".into()))
+}
+
+fn timing_sub(a: i64, b: i64) -> Result<i64> {
+    a.checked_sub(b).ok_or_else(|| Error::Invalid("opus timing overflow".into()))
+}
+
 impl OpusTiming {
     /// Timing of the Opus stream `s` (`pre_skip` from its `OpusHead`).
-    pub fn of(stream: &Stream, pre_skip: u32) -> OpusTiming {
+    ///
+    /// A granule or a run of packet durations that does not fit in `i64` is an error. Ordinary
+    /// files, including a truncated tail and end trimming, are unchanged.
+    pub fn of(stream: &Stream, pre_skip: u32) -> Result<OpusTiming> {
         let durations: Vec<u32> = stream.packets.iter().map(|p| opus_packet_samples(p.prefix, p.size).unwrap_or(0)).collect();
         let n = durations.len();
         let mut ends: Vec<Option<i64>> = vec![None; n];
@@ -433,14 +444,17 @@ impl OpusTiming {
                 // trailing packets without a granule (truncated file): continue from the cursor
                 let mut c = cursor.unwrap_or(0);
                 for k in i..n {
-                    c += durations[k] as i64;
+                    c = timing_add(c, i64::from(durations[k]))?;
                     ends[k] = Some(c);
                 }
                 break;
             }
             let Some(g) = stream.packets[j].granule else { break };
-            let sum: i64 = durations[i..=j].iter().map(|&d| d as i64).sum();
-            let forward = cursor.map(|c| c + sum);
+            let sum = durations[i..=j].iter().try_fold(0i64, |a, &d| timing_add(a, i64::from(d)))?;
+            let forward = match cursor {
+                Some(c) => Some(timing_add(c, sum)?),
+                None => None,
+            };
             let end = match forward {
                 // end trimming on the last page (RFC 7845 §4.5): keep the forward positions
                 Some(f) if stream.packets[j].eos && g < f => {
@@ -454,18 +468,24 @@ impl OpusTiming {
             let mut e = end;
             for k in (i..=j).rev() {
                 ends[k] = Some(e);
-                e -= durations[k] as i64;
+                e = timing_sub(e, i64::from(durations[k]))?;
             }
             cursor = Some(end);
             i = j + 1;
         }
-        let raw_starts: Vec<i64> = ends.iter().zip(&durations).map(|(e, &d)| e.unwrap_or(0) - d as i64).collect();
+        let mut raw_starts = Vec::with_capacity(n);
+        for (e, &d) in ends.iter().zip(&durations) {
+            raw_starts.push(timing_sub(e.unwrap_or(0), i64::from(d))?);
+        }
         let base = raw_starts.first().copied().unwrap_or(0).max(0);
-        let shift = base + pre_skip as i64;
-        let starts: Vec<i64> = raw_starts.iter().map(|s| s - shift).collect();
+        let shift = timing_add(base, i64::from(pre_skip))?;
+        let mut starts = Vec::with_capacity(n);
+        for s in &raw_starts {
+            starts.push(timing_sub(*s, shift)?);
+        }
         let end_all = trimmed_end.or(cursor).unwrap_or(0);
-        let total = (end_all - shift).max(0);
-        OpusTiming { pre_skip, starts, durations, total }
+        let total = timing_sub(end_all, shift)?.max(0);
+        Ok(OpusTiming { pre_skip, starts, durations, total })
     }
 }
 
diff --git a/crates/ogg/src/tests.rs b/crates/ogg/src/tests.rs
index f1879b36..8e118b4e 100644
--- a/crates/ogg/src/tests.rs
+++ b/crates/ogg/src/tests.rs
@@ -99,7 +99,7 @@ fn opus_pages_packets_and_timing() {
     assert_eq!(st.packets.len(), 10);
     assert!(st.saw_eos);
     assert_eq!(o.read_packet(&f, s, 4).unwrap(), pkt(4, 44));
-    let t = OpusTiming::of(st, 312);
+    let t = OpusTiming::of(st, 312).unwrap();
     assert_eq!(t.durations, vec![960; 10]);
     assert_eq!(t.starts[0], -312);
     assert_eq!(t.starts[9], 9 * 960 - 312);
@@ -129,7 +129,7 @@ fn packets_spanning_pages() {
     assert_eq!(st.packets[0].parts.len(), 2);
     assert_eq!(o.read_packet(&f, 0, 0).unwrap(), big);
     assert_eq!(o.read_packet(&f, 0, 1).unwrap(), small);
-    let t = OpusTiming::of(st, 0);
+    let t = OpusTiming::of(st, 0).unwrap();
     assert_eq!(t.starts, vec![0, 960]);
     assert_eq!(t.total, 1920);
 }
@@ -144,13 +144,13 @@ fn corrupt_pages_are_skipped_and_truncation_is_safe() {
     let o = open(&g).unwrap();
     assert!(o.warnings.iter().any(|w| w.contains("CRC")), "{:?}", o.warnings);
     assert_eq!(o.streams[0].packets.len(), 9);
-    let t = OpusTiming::of(&o.streams[0], 312);
+    let t = OpusTiming::of(&o.streams[0], 312).unwrap();
     // the granules after the gap put the later packets at their true positions
     assert_eq!(*t.starts.last().unwrap(), 11 * 960 - 312);
     for cut in 0..f.len() {
         if let Ok(o) = open(&f[..cut].to_vec()) {
             for st in &o.streams {
-                let t = OpusTiming::of(st, 312);
+                let t = OpusTiming::of(st, 312).unwrap();
                 assert_eq!(t.starts.len(), st.packets.len());
             }
         }
@@ -179,3 +179,20 @@ fn opus_toc_durations() {
     assert_eq!(opus_packet_samples([0xF8 | 3, 7], 10), None); // 140 ms: invalid
     assert_eq!(opus_packet_samples([0xF8, 0], 0), None);
 }
+
+#[test]
+fn opus_timing_rejects_a_granule_that_overflows() {
+    let packet = |granule: i64| Stream {
+        serial: 1,
+        codec: Codec::Opus,
+        headers: vec![],
+        packets: vec![Packet { parts: vec![], size: 10, granule: Some(granule), page: 0, eos: true, prefix: [0x00, 0] }],
+        pages: 1,
+        last_granule: Some(granule),
+        saw_eos: true,
+    };
+    let ok = OpusTiming::of(&packet(480), 0).unwrap();
+    assert_eq!(ok.starts, vec![0]);
+    assert_eq!(ok.total, 480);
+    assert!(OpusTiming::of(&packet(i64::MIN), 0).is_err());
+}

From 952ebad3cf45943cb38cb2529d2dcbd701093e3a Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:27:21 +0300
Subject: [PATCH 120/376] Media: a failed or stalled audio output hands the
 clock back to wall time (#417)

A cpal stream error was only kept and logged on stop, and the player kept
`streaming` true, so a device that died mid-play froze the voice and video.

AudioOut gains `failure()` (CpalOut reports DeviceNotAvailable), and
Player::tick also treats a stream with no callbacks for a second while a
voice plays as stalled. Either way the stream is stopped, voices continue on
the wall clock, and the next play retries the device; after three failures
the player gives up on the device and plays silently.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 apps/deckcraft/src/audio.rs |  19 +++-
 crates/media/src/player.rs  | 201 +++++++++++++++++++++++++++++++++++-
 2 files changed, 217 insertions(+), 3 deletions(-)

diff --git a/apps/deckcraft/src/audio.rs b/apps/deckcraft/src/audio.rs
index 53aa48cc..afa74a6a 100644
--- a/apps/deckcraft/src/audio.rs
+++ b/apps/deckcraft/src/audio.rs
@@ -1,6 +1,7 @@
 //! cpal audio output for media playback: the device pulls mixed samples from the
 //! `deckcraft_media::Player`, which makes it the playback clock video frames follow.
 
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex, PoisonError};
 
 use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
@@ -29,6 +30,8 @@ fn take_stream_error(slot: &ErrorSlot) -> Option<String> {
 pub struct CpalOut {
     stream: Option<cpal::Stream>,
     error: ErrorSlot,
+    /// Set by the realtime error callback when the device went away: the stream is dead.
+    dead: Arc<AtomicBool>,
 }
 
 impl CpalOut {
@@ -56,7 +59,14 @@ impl AudioOut for CpalOut {
         let rate = cfg.sample_rate().0;
         let config: cpal::StreamConfig = cfg.clone().into();
         let slot = self.error.clone();
-        let err = move |e: cpal::StreamError| keep_stream_error(&slot, &e);
+        let dead = Arc::new(AtomicBool::new(false));
+        self.dead = dead.clone();
+        let err = move |e: cpal::StreamError| {
+            if matches!(e, cpal::StreamError::DeviceNotAvailable) {
+                dead.store(true, Ordering::Relaxed);
+            }
+            keep_stream_error(&slot, &e);
+        };
         let stream = match cfg.sample_format() {
             cpal::SampleFormat::F32 => dev.build_output_stream(&config, move |buf: &mut [f32], _| fill(buf, channels, rate), err, None),
             cpal::SampleFormat::I16 => {
@@ -86,6 +96,13 @@ impl AudioOut for CpalOut {
         self.stream = None;
         self.report();
     }
+
+    fn failure(&mut self) -> Option<String> {
+        if !self.dead.swap(false, Ordering::Relaxed) {
+            return None;
+        }
+        Some(take_stream_error(&self.error).unwrap_or_else(|| "the audio device is no longer available".to_string()))
+    }
 }
 
 #[cfg(test)]
diff --git a/crates/media/src/player.rs b/crates/media/src/player.rs
index 9ac4a804..3fa3a16a 100644
--- a/crates/media/src/player.rs
+++ b/crates/media/src/player.rs
@@ -11,6 +11,7 @@
 //! decoded runs silently.
 
 use std::collections::HashMap;
+use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::{Arc, Mutex, OnceLock};
 
 use crate::{Bytes, ClipParams, Pcm};
@@ -20,6 +21,12 @@ use crate::{Bytes, ClipParams, Pcm};
 pub trait AudioOut {
     fn start(&mut self, fill: Box<dyn FnMut(&mut [f32], usize, u32) + Send>) -> Result<(), String>;
     fn stop(&mut self);
+    /// Why the started stream has died, if it has (the device went away), reported once. Polled
+    /// by [`Player::tick`] on the host thread; must not block. Outputs that cannot tell return
+    /// `None`: the player also notices a stream whose callbacks stopped.
+    fn failure(&mut self) -> Option<String> {
+        None
+    }
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -186,6 +193,13 @@ impl Mixer {
 /// Default mix rate when no device says otherwise.
 const DEFAULT_RATE: u32 = 48_000;
 
+/// Seconds without a single device callback, while a voice plays, after which the stream counts
+/// as stalled and the wall clock takes over.
+const STALL_SECS: f64 = 1.0;
+
+/// Output failures after which the player stops retrying the device and plays silently.
+const MAX_OUTPUT_FAILURES: u32 = 3;
+
 pub struct Player {
     out: Option<Box<dyn AudioOut>>,
     streaming: bool,
@@ -193,12 +207,28 @@ pub struct Player {
     last_tick: Option<f64>,
     idle_since: Option<f64>,
     cache: HashMap<u64, Slot>,
+    /// Device callbacks so far (the audio thread counts, [`Player::tick`] watches).
+    pulls: Arc<AtomicU64>,
+    /// The pull count last seen by `tick` and when it last changed.
+    pulls_seen: Option<(u64, f64)>,
+    /// Times the output failed or stalled after starting.
+    failures: u32,
 }
 
 impl Player {
     /// A player over `out` (`None`: silent, clocked by [`Player::tick`]).
     pub fn new(out: Option<Box<dyn AudioOut>>) -> Player {
-        Player { out, streaming: false, mixer: Arc::new(Mutex::new(Mixer::default())), last_tick: None, idle_since: None, cache: HashMap::new() }
+        Player {
+            out,
+            streaming: false,
+            mixer: Arc::new(Mutex::new(Mixer::default())),
+            last_tick: None,
+            idle_since: None,
+            cache: HashMap::new(),
+            pulls: Arc::new(AtomicU64::new(0)),
+            pulls_seen: None,
+            failures: 0,
+        }
     }
 
     pub fn has_output(&self) -> bool {
@@ -267,15 +297,20 @@ impl Player {
         }
         let Some(out) = self.out.as_mut() else { return };
         let m = self.mixer.clone();
+        let pulls = self.pulls.clone();
         let fill = Box::new(move |buf: &mut [f32], channels: usize, rate: u32| match m.lock() {
             Ok(mut g) => {
+                pulls.fetch_add(1, Ordering::Relaxed);
                 let frames = buf.len() / channels.max(1);
                 g.mix(Some(buf), frames, channels, rate)
             }
             Err(_) => buf.fill(0.0),
         });
         match out.start(fill) {
-            Ok(()) => self.streaming = true,
+            Ok(()) => {
+                self.streaming = true;
+                self.pulls_seen = None;
+            }
             Err(e) => {
                 log::warn!("audio output unavailable ({e}); media plays silently");
                 self.out = None;
@@ -338,6 +373,7 @@ impl Player {
     pub fn tick(&mut self, now: f64) {
         let dt = self.last_tick.map(|l| (now - l).clamp(0.0, 0.25)).unwrap_or(0.0);
         self.last_tick = Some(now);
+        self.check_output(now);
         if !self.streaming && dt > 0.0 {
             let frames = (dt * DEFAULT_RATE as f64).round() as usize;
             self.with(|m| m.mix(None, frames, 2, DEFAULT_RATE));
@@ -355,6 +391,50 @@ impl Player {
         }
     }
 
+    /// Drop a stream that died or stalled, so the voices fall back to the wall clock instead of
+    /// freezing. The next `play` tries the device again, up to [`MAX_OUTPUT_FAILURES`] times.
+    fn check_output(&mut self, now: f64) {
+        if !self.streaming {
+            return;
+        }
+        // Only a playing voice needs callbacks; an idle stream may legitimately sleep.
+        let playing = self.any_playing();
+        let Some(out) = self.out.as_mut() else { return };
+        let pulls = self.pulls.load(Ordering::Relaxed);
+        let reason = if let Some(e) = out.failure() {
+            Some(e)
+        } else {
+            match self.pulls_seen {
+                Some((seen, since)) if seen == pulls => {
+                    if !playing {
+                        self.pulls_seen = Some((pulls, now));
+                        None
+                    } else if now - since > STALL_SECS {
+                        Some("the audio device stopped asking for samples".to_string())
+                    } else {
+                        None
+                    }
+                }
+                _ => {
+                    self.pulls_seen = Some((pulls, now));
+                    None
+                }
+            }
+        };
+        let Some(reason) = reason else { return };
+        out.stop();
+        self.streaming = false;
+        self.pulls_seen = None;
+        self.idle_since = None;
+        self.failures = self.failures.saturating_add(1);
+        if self.failures >= MAX_OUTPUT_FAILURES {
+            log::warn!("audio output failed ({reason}); giving up on the device, media plays silently");
+            self.out = None;
+        } else {
+            log::warn!("audio output failed ({reason}); media plays silently until it restarts");
+        }
+    }
+
     /// Block until voice `key`'s audio has decoded (tests, offline rendering).
     pub fn wait_loaded(&self, key: u64, timeout: std::time::Duration) -> bool {
         let slot = self.with(|m| m.voices.iter().find(|v| v.key == key).and_then(|v| v.audio.clone()));
@@ -502,4 +582,121 @@ mod tests {
         let pos = p.status(3).map(|s| s.position).unwrap_or(-1.0);
         assert!((pos - 0.1).abs() < 1e-6, "{pos}");
     }
+
+    type Fill = Box<dyn FnMut(&mut [f32], usize, u32) + Send>;
+
+    /// An output that starts, then fails or goes quiet on command.
+    #[derive(Clone, Default)]
+    struct Flaky {
+        fill: Arc<Mutex<Option<Fill>>>,
+        fail: Arc<Mutex<Option<String>>>,
+        starts: Arc<Mutex<u32>>,
+    }
+    impl AudioOut for Flaky {
+        fn start(&mut self, fill: Fill) -> Result<(), String> {
+            *self.fill.lock().map_err(|e| e.to_string())? = Some(fill);
+            *self.starts.lock().map_err(|e| e.to_string())? += 1;
+            Ok(())
+        }
+        fn stop(&mut self) {
+            if let Ok(mut f) = self.fill.lock() {
+                *f = None;
+            }
+        }
+        fn failure(&mut self) -> Option<String> {
+            self.fail.lock().ok().and_then(|mut f| f.take())
+        }
+    }
+    impl Flaky {
+        fn pull(&self, frames: usize) {
+            let mut buf = vec![0.0; frames * 2];
+            if let Some(f) = self.fill.lock().ok().as_mut().and_then(|g| g.as_mut()) {
+                f(&mut buf, 2, 48_000);
+            }
+        }
+        fn starts(&self) -> u32 {
+            self.starts.lock().map(|s| *s).unwrap_or(0)
+        }
+    }
+
+    fn pos(p: &Player, key: u64) -> f64 {
+        p.status(key).map(|s| s.position).unwrap_or(-1.0)
+    }
+
+    #[test]
+    fn a_failed_output_falls_back_to_the_wall_clock() {
+        let out = Flaky::default();
+        let mut p = Player::new(Some(Box::new(out.clone())));
+        let b: Bytes = Arc::new(vec![]);
+        p.play(1, 1, &b, spec(10.0, false), None);
+        p.tick(0.0);
+        out.pull(4800);
+        assert!((pos(&p, 1) - 0.1).abs() < 1e-6);
+        if let Ok(mut f) = out.fail.lock() {
+            *f = Some("unplugged".into());
+        }
+        p.tick(0.2);
+        p.tick(0.4);
+        // The voice keeps moving on wall time instead of freezing: 0.1 s from the device, then
+        // the 0.4 s of wall time since the last tick before the failure.
+        assert!((pos(&p, 1) - 0.5).abs() < 1e-3, "{}", pos(&p, 1));
+        assert_eq!(p.status(1).map(|s| s.state), Some(PlayState::Playing));
+        // Playing again restarts the device.
+        p.play(2, 2, &b, spec(10.0, false), None);
+        assert_eq!(out.starts(), 2);
+        assert!(p.has_output());
+    }
+
+    #[test]
+    fn a_stalled_output_falls_back_to_the_wall_clock() {
+        let out = Flaky::default();
+        let mut p = Player::new(Some(Box::new(out.clone())));
+        let b: Bytes = Arc::new(vec![]);
+        p.play(1, 1, &b, spec(10.0, false), None);
+        // No callback ever arrives.
+        for i in 0..=5 {
+            p.tick(i as f64 * 0.25);
+        }
+        let before = pos(&p, 1);
+        assert!(before > 0.0, "{before}");
+        p.tick(1.5);
+        assert!((pos(&p, 1) - before - 0.25).abs() < 1e-3);
+    }
+
+    #[test]
+    fn an_idle_stream_without_callbacks_is_not_a_stall() {
+        let out = Flaky::default();
+        let mut p = Player::new(Some(Box::new(out.clone())));
+        let b: Bytes = Arc::new(vec![]);
+        p.play(1, 1, &b, spec(10.0, false), None);
+        p.pause(1);
+        for i in 0..=8 {
+            p.tick(i as f64 * 0.25);
+        }
+        // Resuming keeps the running stream: no restart.
+        p.play(1, 1, &b, spec(10.0, false), None);
+        assert_eq!(out.starts(), 1);
+    }
+
+    #[test]
+    fn repeated_failures_give_up_on_the_device() {
+        let out = Flaky::default();
+        let mut p = Player::new(Some(Box::new(out.clone())));
+        let b: Bytes = Arc::new(vec![]);
+        let mut now = 0.0;
+        for _ in 0..MAX_OUTPUT_FAILURES {
+            p.play(1, 1, &b, spec(100.0, false), None);
+            if let Ok(mut f) = out.fail.lock() {
+                *f = Some("broken".into());
+            }
+            p.tick(now);
+            now += 0.1;
+        }
+        assert!(!p.has_output());
+        assert_eq!(out.starts(), MAX_OUTPUT_FAILURES);
+        // Still plays, silently on wall time.
+        let before = pos(&p, 1);
+        p.tick(now + 0.2);
+        assert!(pos(&p, 1) > before);
+    }
 }

From 8dc068e0bacab1f058c17e270a1d7909ec02ac97 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:39:36 +0300
Subject: [PATCH 121/376] Control server: bound connections, line length, queue
 and socket timeouts (#418)

The loopback control server spawned a thread per connection, read
unbounded lines, queued requests without limit and set no socket
deadlines. It now caps simultaneous clients (16) and request lines
(16 MiB), uses a bounded request queue (64) that answers busy when full,
closes sockets idle for 10 minutes or blocked on a write for 30 seconds,
and frees a connection slot whenever a client thread ends.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 apps/deckcraft/src/control_server.rs | 274 +++++++++++++++++++++++++--
 docs/control-protocol.md             |   5 +
 2 files changed, 260 insertions(+), 19 deletions(-)

diff --git a/apps/deckcraft/src/control_server.rs b/apps/deckcraft/src/control_server.rs
index f50de025..6dbf0740 100644
--- a/apps/deckcraft/src/control_server.rs
+++ b/apps/deckcraft/src/control_server.rs
@@ -1,39 +1,146 @@
 //! Loopback JSON-lines control server: one request per line, one reply per line.
 //! This is the transport the MCP server (`deckcraft-cli mcp --connect`) wraps.
+//!
+//! Every resource a client can hold is bounded ([`Limits`]): simultaneous connections, request
+//! line length, queued requests, and how long a socket may sit idle or blocked on a write.
 
-use std::io::{BufRead, BufReader, Write};
+use std::io::{BufRead, BufReader, ErrorKind, Read, Write};
 use std::net::{TcpListener, TcpStream};
-use std::sync::mpsc::{Receiver, Sender, channel};
+use std::sync::Arc;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::sync::mpsc::{Receiver, SyncSender, TrySendError, sync_channel};
 use std::time::Duration;
 
 use deckcraft_ui_egui::ControlRequest;
 use serde_json::{Value, json};
 
+/// Resource bounds for the control server.
+#[derive(Clone, Copy, Debug)]
+pub struct Limits {
+    /// Connections served at once; more are told `busy` and closed.
+    pub max_clients: usize,
+    /// Longest request line in bytes (newline excluded); a longer one closes the connection.
+    pub max_line: usize,
+    /// Requests waiting for the UI at once; more are answered `busy`.
+    pub queue: usize,
+    /// How long a connection may go without sending a byte before it is closed.
+    pub idle_timeout: Duration,
+    /// How long a reply write may block before the connection is closed.
+    pub write_timeout: Duration,
+    /// How long a request waits for the UI's answer.
+    pub reply_timeout: Duration,
+}
+
+impl Default for Limits {
+    fn default() -> Self {
+        Self {
+            max_clients: 16,
+            max_line: 16 * 1024 * 1024,
+            queue: 64,
+            idle_timeout: Duration::from_secs(600),
+            write_timeout: Duration::from_secs(30),
+            reply_timeout: Duration::from_secs(60),
+        }
+    }
+}
+
 pub fn start(port: u16, ctx: egui::Context) -> Receiver<ControlRequest> {
-    let (tx, rx) = channel::<ControlRequest>();
-    let listener = match TcpListener::bind(("127.0.0.1", port)) {
-        Ok(l) => l,
+    match TcpListener::bind(("127.0.0.1", port)) {
+        Ok(l) => {
+            log::info!("control server listening on 127.0.0.1:{port}");
+            serve_listener(l, Limits::default(), ctx)
+        }
         Err(e) => {
             log::error!("control server failed to bind 127.0.0.1:{port}: {e}");
-            return rx;
+            sync_channel::<ControlRequest>(0).1
         }
-    };
-    log::info!("control server listening on 127.0.0.1:{port}");
+    }
+}
+
+/// Accept connections on `listener` under `limits`; requests arrive on the returned receiver.
+fn serve_listener(listener: TcpListener, limits: Limits, ctx: egui::Context) -> Receiver<ControlRequest> {
+    let (tx, rx) = sync_channel::<ControlRequest>(limits.queue.max(1));
+    let active = Arc::new(AtomicUsize::new(0));
     std::thread::spawn(move || {
-        for stream in listener.incoming().flatten() {
+        for mut stream in listener.incoming().flatten() {
+            let _ = stream.set_write_timeout(Some(limits.write_timeout));
+            if active.fetch_add(1, Ordering::SeqCst) >= limits.max_clients {
+                active.fetch_sub(1, Ordering::SeqCst);
+                let _ = writeln!(stream, "{}", json!({"ok": false, "error": "busy: too many control connections"}));
+                continue;
+            }
+            let slot = Slot(Arc::clone(&active));
             let tx = tx.clone();
             let ctx = ctx.clone();
-            std::thread::spawn(move || serve(stream, tx, ctx));
+            let spawned = std::thread::Builder::new().name("control-client".into()).spawn(move || {
+                let _slot = slot;
+                serve(stream, &tx, &ctx, limits);
+            });
+            if spawned.is_err() {
+                log::warn!("control server could not start a client thread");
+            }
         }
     });
     rx
 }
 
-fn serve(stream: TcpStream, tx: Sender<ControlRequest>, ctx: egui::Context) {
+/// Holds one connection slot; gives it back when the client thread ends, however it ends.
+struct Slot(Arc<AtomicUsize>);
+
+impl Drop for Slot {
+    fn drop(&mut self) {
+        self.0.fetch_sub(1, Ordering::SeqCst);
+    }
+}
+
+enum Line {
+    Text(Vec<u8>),
+    TooLong,
+    Closed,
+}
+
+/// Read one `\n`-terminated line of at most `max` bytes without buffering more than `max + 1`.
+fn read_line(r: &mut impl BufRead, max: usize) -> Line {
+    let mut buf = Vec::new();
+    let limit = u64::try_from(max).unwrap_or(u64::MAX).saturating_add(1);
+    match r.by_ref().take(limit).read_until(b'\n', &mut buf) {
+        Ok(0) | Err(_) => Line::Closed,
+        Ok(_) => {
+            if buf.last() == Some(&b'\n') {
+                buf.pop();
+                Line::Text(buf)
+            } else if buf.len() > max {
+                Line::TooLong
+            } else {
+                // EOF inside a line: serve what arrived, the next read reports Closed.
+                Line::Text(buf)
+            }
+        }
+    }
+}
+
+fn serve(stream: TcpStream, tx: &SyncSender<ControlRequest>, ctx: &egui::Context, limits: Limits) {
+    if stream.set_read_timeout(Some(limits.idle_timeout)).is_err() || stream.set_write_timeout(Some(limits.write_timeout)).is_err() {
+        return;
+    }
     let Ok(read) = stream.try_clone() else { return };
     let mut out = stream;
-    for line in BufReader::new(read).lines() {
-        let Ok(line) = line else { break };
+    let mut reader = BufReader::new(read);
+    loop {
+        let line = match read_line(&mut reader, limits.max_line) {
+            Line::Text(t) => t,
+            Line::TooLong => {
+                let _ = writeln!(out, "{}", json!({"ok": false, "error": format!("request line longer than {} bytes", limits.max_line)}));
+                break;
+            }
+            Line::Closed => break,
+        };
+        let Ok(line) = String::from_utf8(line) else {
+            if writeln!(out, "{}", json!({"ok": false, "error": "bad JSON: not UTF-8"})).is_err() {
+                break;
+            }
+            continue;
+        };
         if line.trim().is_empty() {
             continue;
         }
@@ -43,11 +150,14 @@ fn serve(stream: TcpStream, tx: Sender<ControlRequest>, ctx: egui::Context) {
                 let method = msg.get("method").and_then(Value::as_str).unwrap_or("").to_string();
                 let params = msg.get("params").cloned().unwrap_or(json!({}));
                 let (req, rrx) = ControlRequest::new(method, params);
-                if tx.send(req).is_err() {
-                    break;
-                }
-                ctx.request_repaint();
-                let mut r = rrx.recv_timeout(Duration::from_secs(60)).unwrap_or_else(|_| json!({"ok": false, "error": "timeout"}));
+                let mut r = match tx.try_send(req) {
+                    Ok(()) => {
+                        ctx.request_repaint();
+                        rrx.recv_timeout(limits.reply_timeout).unwrap_or_else(|_| json!({"ok": false, "error": "timeout"}))
+                    }
+                    Err(TrySendError::Full(_)) => json!({"ok": false, "error": "busy: too many queued requests"}),
+                    Err(TrySendError::Disconnected(_)) => break,
+                };
                 if let Some(o) = r.as_object_mut() {
                     o.insert("id".into(), id);
                 }
@@ -55,8 +165,134 @@ fn serve(stream: TcpStream, tx: Sender<ControlRequest>, ctx: egui::Context) {
             }
             Err(e) => json!({"ok": false, "error": format!("bad JSON: {e}")}),
         };
-        if writeln!(out, "{reply}").is_err() {
+        if let Err(e) = writeln!(out, "{reply}") {
+            if matches!(e.kind(), ErrorKind::WouldBlock | ErrorKind::TimedOut) {
+                log::debug!("control client stopped reading replies; closing");
+            }
             break;
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::net::SocketAddr;
+    use std::time::Instant;
+
+    fn small() -> Limits {
+        Limits {
+            max_clients: 2,
+            max_line: 64,
+            queue: 1,
+            idle_timeout: Duration::from_millis(300),
+            write_timeout: Duration::from_millis(300),
+            reply_timeout: Duration::from_millis(300),
+        }
+    }
+
+    fn server(limits: Limits) -> (SocketAddr, Receiver<ControlRequest>) {
+        let l = TcpListener::bind("127.0.0.1:0").unwrap();
+        let addr = l.local_addr().unwrap();
+        (addr, serve_listener(l, limits, egui::Context::default()))
+    }
+
+    fn client(addr: SocketAddr) -> (BufReader<TcpStream>, TcpStream) {
+        let s = TcpStream::connect(addr).unwrap();
+        s.set_read_timeout(Some(Duration::from_secs(5))).unwrap();
+        (BufReader::new(s.try_clone().unwrap()), s)
+    }
+
+    fn reply(r: &mut BufReader<TcpStream>) -> Option<Value> {
+        let mut s = String::new();
+        match r.read_line(&mut s) {
+            Ok(0) | Err(_) => None,
+            Ok(_) => serde_json::from_str(&s).ok(),
+        }
+    }
+
+    /// Answer every request with its method name until the server goes away.
+    fn ui(rx: Receiver<ControlRequest>) {
+        std::thread::spawn(move || {
+            for req in rx {
+                let _ = req.reply.send(json!({"ok": true, "result": req.method}));
+            }
+        });
+    }
+
+    #[test]
+    fn request_round_trip() {
+        let (addr, rx) = server(small());
+        ui(rx);
+        let (mut r, mut w) = client(addr);
+        writeln!(w, r#"{{"id":7,"method":"ui.inspect"}}"#).unwrap();
+        let v = reply(&mut r).unwrap();
+        assert_eq!(v["id"], 7);
+        assert_eq!(v["result"], "ui.inspect");
+    }
+
+    #[test]
+    fn oversized_line_closes_connection() {
+        let (addr, rx) = server(small());
+        ui(rx);
+        let (mut r, mut w) = client(addr);
+        w.write_all(&[b'x'; 200]).unwrap();
+        let v = reply(&mut r).unwrap();
+        assert!(v["error"].as_str().unwrap().contains("longer than 64"));
+        assert!(reply(&mut r).is_none());
+    }
+
+    #[test]
+    fn idle_connection_is_closed() {
+        let (addr, rx) = server(small());
+        ui(rx);
+        let (mut r, mut w) = client(addr);
+        w.write_all(b"{\"id\":1,").unwrap(); // unterminated, then silence
+        let t = Instant::now();
+        assert!(reply(&mut r).is_none());
+        assert!(t.elapsed() < Duration::from_secs(4));
+    }
+
+    #[test]
+    fn connection_limit_refuses_then_frees_slot() {
+        let (addr, rx) = server(small());
+        ui(rx);
+        let a = client(addr);
+        let (mut br, mut bw) = client(addr);
+        // Make sure both are being served before the third arrives.
+        writeln!(bw, r#"{{"id":1,"method":"m"}}"#).unwrap();
+        assert!(reply(&mut br).is_some());
+        let (mut cr, _cw) = client(addr);
+        let v = reply(&mut cr).unwrap();
+        assert!(v["error"].as_str().unwrap().starts_with("busy"));
+        drop(a);
+        // The freed slot is reusable once the server notices the disconnect.
+        let deadline = Instant::now() + Duration::from_secs(4);
+        loop {
+            let (mut dr, mut dw) = client(addr);
+            writeln!(dw, r#"{{"id":2,"method":"m"}}"#).unwrap();
+            if reply(&mut dr).is_some_and(|v| v["ok"] == true) {
+                break;
+            }
+            assert!(Instant::now() < deadline, "slot never freed");
+            std::thread::sleep(Duration::from_millis(50));
+        }
+    }
+
+    #[test]
+    fn blocked_ui_times_out_and_full_queue_is_busy() {
+        let (addr, rx) = server(small());
+        // No UI: the first request fills the one-slot queue and times out; the second finds it full.
+        let (mut ar, mut aw) = client(addr);
+        let (mut br, mut bw) = client(addr);
+        writeln!(aw, r#"{{"id":1,"method":"m"}}"#).unwrap();
+        std::thread::sleep(Duration::from_millis(50));
+        writeln!(bw, r#"{{"id":2,"method":"m"}}"#).unwrap();
+        let b = reply(&mut br).unwrap();
+        assert!(b["error"].as_str().unwrap().starts_with("busy"));
+        assert_eq!(b["id"], 2);
+        let a = reply(&mut ar).unwrap();
+        assert_eq!(a["error"], "timeout");
+        drop(rx);
+    }
+}
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 07741fde..41f890c0 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -3,6 +3,11 @@
 Start the app with `--control <port>`. The server listens on `127.0.0.1` only and speaks JSON
 lines: one request object per line, one reply per line.
 
+The server bounds what a client can hold: 16 connections at once (more get `{"ok":false,"error":"busy: …"}`
+and are closed), 16 MiB per request line (longer closes the connection), 64 queued requests (more are
+answered `busy`), 10 minutes idle and 30 seconds per blocked reply write before the socket is closed, and
+60 seconds waiting for the UI (`"error":"timeout"`).
+
 ```json
 {"id": 1, "method": "engine.execute", "params": {"command": "shape.insert", "params": {"preset": "roundRect", "rect": [100, 100, 240, 120], "text": "Hello"}}}
 {"id": 1, "ok": true, "result": {"id": 258}}

From de098cfa5266fae4e7aeca3e0beb8c938d744f99 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:39:57 +0300
Subject: [PATCH 122/376] Anim: group animations by sequence in one pass (#410)

Timeline::with found trigger sequences with Vec::contains and then rescanned
every animation once per sequence, and checked MAX_EFFECTS only after a
match, so a slide with many distinct triggers cost quadratic work before the
effect cap could stop it.

Animations are now grouped once (an index by sequence, first-appearance order
kept, main first), the build stops at MAX_EFFECTS before the next sequence,
and paragraph groups are deduplicated with a set instead of Vec::contains.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/anim/src/tests.rs    | 35 ++++++++++++++++++++++++++++++++++
 crates/anim/src/timeline.rs | 38 ++++++++++++++++++++++---------------
 2 files changed, 58 insertions(+), 15 deletions(-)

diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..05ceb740 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -789,3 +789,38 @@ fn show_follows_links() {
     assert_eq!(s.follow(&p, &Action::LastViewed, None), LinkJump::None);
     assert_eq!(s.slide, 3);
 }
+
+#[test]
+fn trigger_sequences_keep_first_appearance_order_when_interleaved() {
+    let mut anims = vec![];
+    for (i, tr) in [7u32, 5, 7, 0, 9, 5].iter().enumerate() {
+        let mut a = anim(1 + (i as u32 % 4), AnimClass::Entrance, "fade", AnimStart::OnClick);
+        a.trigger = (*tr != 0).then_some(ShapeId(*tr));
+        anims.push(a);
+    }
+    let tl = Timeline::new(&slide_with(anims), W, H);
+    assert_eq!(tl.trigger_shapes(), vec![ShapeId(7), ShapeId(5), ShapeId(9)]);
+    assert_eq!(tl.trigger_steps(ShapeId(7)), 2);
+    assert_eq!(tl.trigger_steps(ShapeId(5)), 2);
+    assert_eq!(tl.trigger_steps(ShapeId(9)), 1);
+    assert_eq!(tl.steps(), 1);
+}
+
+#[test]
+fn many_distinct_triggers_past_the_effect_cap_build_in_order() {
+    // One sequence per animation: grouping used to rescan every animation per trigger
+    // (~1.2e10 steps here), now it is one pass, and nothing past the cap is looked at.
+    let n = 110_000u32;
+    let anims: Vec<Animation> = (0..n)
+        .map(|i| {
+            let mut a = anim(1, AnimClass::Entrance, "appear", AnimStart::OnClick);
+            a.trigger = Some(ShapeId(1000 + i));
+            a
+        })
+        .collect();
+    let tl = Timeline::new(&slide_with(anims), W, H);
+    assert_eq!(tl.effects().len(), 100_000);
+    let shapes = tl.trigger_shapes();
+    assert_eq!(shapes.len(), 100_000);
+    assert!(shapes.iter().enumerate().all(|(i, s)| *s == ShapeId(1000 + i as u32)));
+}
diff --git a/crates/anim/src/timeline.rs b/crates/anim/src/timeline.rs
index e73acfd9..9692b884 100644
--- a/crates/anim/src/timeline.rs
+++ b/crates/anim/src/timeline.rs
@@ -1,5 +1,7 @@
 //! A slide's animation sequence: click steps, effect start times and per-shape state over time.
 
+use std::collections::{HashMap, HashSet};
+
 use deckcraft_model::anim::TextBuild;
 use deckcraft_model::style::Fill;
 use deckcraft_model::{AnimClass, AnimStart, Animation, ColorScheme, Rgba, SchemeSlot, ShapeId, Slide, Xfrm};
@@ -151,25 +153,31 @@ impl Timeline {
         let accent = scheme.map(|s| s.get(SchemeSlot::Accent1)).unwrap_or(Rgba::rgb(0x15, 0x60, 0x82));
 
         let mut tl = Timeline::default();
-        // Sequences in order of first appearance: main first.
-        let mut seqs: Vec<Sequence> = vec![Sequence::Main];
-        for a in &slide.animations {
-            if let Some(tr) = a.trigger {
-                let s = Sequence::Trigger(tr);
-                if !seqs.contains(&s) {
-                    seqs.push(s);
-                }
+        // Group the animations by sequence in one pass, sequences in order of first appearance
+        // (main first), so many distinct triggers cost linear work, not a scan per trigger.
+        let mut seqs: Vec<(Sequence, Vec<usize>)> = vec![(Sequence::Main, Vec::new())];
+        let mut seq_index: HashMap<Sequence, usize> = HashMap::from([(Sequence::Main, 0)]);
+        for (ai, a) in slide.animations.iter().enumerate() {
+            let s = a.trigger.map(Sequence::Trigger).unwrap_or(Sequence::Main);
+            let i = *seq_index.entry(s).or_insert_with(|| {
+                seqs.push((s, Vec::new()));
+                seqs.len() - 1
+            });
+            if let Some((_, members)) = seqs.get_mut(i) {
+                members.push(ai);
             }
         }
-        for seq in seqs {
+        // Paragraph groups already recorded (the list itself keeps their order).
+        let mut grouped: HashSet<(ShapeId, usize, usize)> = HashSet::new();
+        for (seq, members) in seqs {
+            if tl.effects.len() >= MAX_EFFECTS {
+                break;
+            }
             let mut steps: Vec<StepInfo> = Vec::new();
             let mut group_begin = 0.0f64;
             let mut max_end = 0.0f64;
-            for (ai, a) in slide.animations.iter().enumerate() {
-                let aseq = a.trigger.map(Sequence::Trigger).unwrap_or(Sequence::Main);
-                if aseq != seq {
-                    continue;
-                }
+            for ai in members {
+                let Some(a) = slide.animations.get(ai) else { continue };
                 if tl.effects.len() >= MAX_EFFECTS {
                     break;
                 }
@@ -188,7 +196,7 @@ impl Timeline {
                                     owner = Some(i);
                                     v.push(Some(i));
                                 } else if let Some(o) = owner
-                                    && !tl.groups.contains(&(a.shape, i, o))
+                                    && grouped.insert((a.shape, i, o))
                                 {
                                     tl.groups.push((a.shape, i, o));
                                 }

From fb2a83edb64f361fba517b8946218a8a6ad6bcaf Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:44:37 +0300
Subject: [PATCH 123/376] Table: inserting and deleting rows and columns keeps
 merges consistent (#408)

Row and column insert/delete ignored merged cells, leaving covered cells
with no anchor or new cells overlapping an existing span. These edits now
read the merged areas first, shift or resize each one (a row or column
inserted inside a merge widens it, one deleted from it narrows it), move
the anchor and its text to the next covered cell when the anchor row or
column is deleted, and rebuild spans and merge flags from the result.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/model/src/table.rs | 222 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 222 insertions(+)

diff --git a/crates/model/src/table.rs b/crates/model/src/table.rs
index 2dd46e3b..507b9bd0 100644
--- a/crates/model/src/table.rs
+++ b/crates/model/src/table.rs
@@ -106,39 +106,120 @@ impl Table {
     pub fn height(&self) -> f64 {
         self.rows.iter().map(|r| r.height).sum()
     }
+    /// Insert an empty row before `at`. A merge the new row falls inside grows to cover it.
     pub fn insert_row(&mut self, at: usize) {
         let at = at.min(self.rows.len());
+        let merges = self.merges();
         let h = self.rows.get(at.saturating_sub(1)).map(|r| r.height).unwrap_or(30.0);
         self.rows.insert(at, Row { height: h, cells: (0..self.cols.len()).map(|_| Cell::new("")).collect() });
+        self.set_merges(merges.into_iter().map(|m| m.insert_row(at)));
     }
+    /// Insert an empty column before `at`. A merge the new column falls inside grows to cover it.
     pub fn insert_col(&mut self, at: usize) {
         let at = at.min(self.cols.len());
+        let merges = self.merges();
         let w = self.cols.get(at.saturating_sub(1)).copied().unwrap_or(80.0);
         self.cols.insert(at, w);
         for r in &mut self.rows {
             let i = at.min(r.cells.len());
             r.cells.insert(i, Cell::new(""));
         }
+        self.set_merges(merges.into_iter().map(|m| m.insert_col(at)));
     }
+    /// Delete row `at`. Merges through it shrink; a merge anchored on it moves its anchor (and
+    /// text) to the next row it covers.
     pub fn delete_row(&mut self, at: usize) -> bool {
         if self.rows.len() <= 1 || at >= self.rows.len() {
             return false;
         }
+        let merges = self.merges();
+        for m in &merges {
+            if m.r == at && m.rs > 1 {
+                self.move_anchor((m.r, m.c), (m.r + 1, m.c));
+            }
+        }
         self.rows.remove(at);
+        self.set_merges(merges.into_iter().filter_map(|m| m.delete_row(at)));
         true
     }
+    /// Delete column `at`. Merges through it shrink; a merge anchored on it moves its anchor (and
+    /// text) to the next column it covers.
     pub fn delete_col(&mut self, at: usize) -> bool {
         if self.cols.len() <= 1 || at >= self.cols.len() {
             return false;
         }
+        let merges = self.merges();
+        for m in &merges {
+            if m.c == at && m.gs > 1 {
+                self.move_anchor((m.r, m.c), (m.r, m.c + 1));
+            }
+        }
         self.cols.remove(at);
         for r in &mut self.rows {
             if at < r.cells.len() {
                 r.cells.remove(at);
             }
         }
+        self.set_merges(merges.into_iter().filter_map(|m| m.delete_col(at)));
         true
     }
+    /// The merged areas: every uncovered cell spanning more than one cell, clipped to the grid.
+    fn merges(&self) -> Vec<Merge> {
+        let (nr, nc) = (self.rows.len(), self.cols.len());
+        let mut out = vec![];
+        for (r, row) in self.rows.iter().enumerate() {
+            for (c, cell) in row.cells.iter().enumerate().take(nc) {
+                if cell.is_covered() {
+                    continue;
+                }
+                let rs = (cell.row_span.max(1) as usize).min(nr - r);
+                let gs = (cell.grid_span.max(1) as usize).min(nc - c);
+                if rs > 1 || gs > 1 {
+                    out.push(Merge { r, c, rs, gs });
+                }
+            }
+        }
+        out
+    }
+    /// Rebuild every cell's spans and merge flags from `merges`.
+    fn set_merges(&mut self, merges: impl IntoIterator<Item = Merge>) {
+        for row in &mut self.rows {
+            for cell in &mut row.cells {
+                cell.grid_span = 1;
+                cell.row_span = 1;
+                cell.h_merge = false;
+                cell.v_merge = false;
+            }
+        }
+        for m in merges {
+            if m.rs <= 1 && m.gs <= 1 {
+                continue;
+            }
+            for r in m.r..m.r.saturating_add(m.rs) {
+                for c in m.c..m.c.saturating_add(m.gs) {
+                    if let Some(cell) = self.cell_mut(r, c) {
+                        cell.h_merge = c > m.c;
+                        cell.v_merge = r > m.r;
+                    }
+                }
+            }
+            if let Some(cell) = self.cell_mut(m.r, m.c) {
+                cell.grid_span = u32::try_from(m.gs).unwrap_or(u32::MAX);
+                cell.row_span = u32::try_from(m.rs).unwrap_or(u32::MAX);
+            }
+        }
+    }
+    /// Swap the anchor cell's contents into the cell that takes over as anchor.
+    fn move_anchor(&mut self, from: (usize, usize), to: (usize, usize)) {
+        let Some(a) = self.cell(from.0, from.1).cloned() else { return };
+        let Some(b) = self.cell(to.0, to.1).cloned() else { return };
+        if let Some(x) = self.cell_mut(to.0, to.1) {
+            *x = a;
+        }
+        if let Some(x) = self.cell_mut(from.0, from.1) {
+            *x = b;
+        }
+    }
     /// Merge the rectangle (r0,c0)–(r1,c1) inclusive into its top-left cell.
     pub fn merge(&mut self, r0: usize, c0: usize, r1: usize, c1: usize) -> bool {
         let (r0, r1) = (r0.min(r1), r0.max(r1));
@@ -203,6 +284,56 @@ impl Table {
     }
 }
 
+/// A merged area: anchor (r, c) spanning `rs` rows and `gs` columns.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+struct Merge {
+    r: usize,
+    c: usize,
+    rs: usize,
+    gs: usize,
+}
+
+impl Merge {
+    fn insert_row(self, at: usize) -> Self {
+        if at <= self.r {
+            Merge { r: self.r + 1, ..self }
+        } else if at < self.r + self.rs {
+            Merge { rs: self.rs + 1, ..self }
+        } else {
+            self
+        }
+    }
+    fn insert_col(self, at: usize) -> Self {
+        if at <= self.c {
+            Merge { c: self.c + 1, ..self }
+        } else if at < self.c + self.gs {
+            Merge { gs: self.gs + 1, ..self }
+        } else {
+            self
+        }
+    }
+    fn delete_row(self, at: usize) -> Option<Self> {
+        let m = if at < self.r {
+            Merge { r: self.r - 1, ..self }
+        } else if at < self.r + self.rs {
+            Merge { rs: self.rs - 1, ..self }
+        } else {
+            self
+        };
+        (m.rs > 1 || m.gs > 1).then_some(m)
+    }
+    fn delete_col(self, at: usize) -> Option<Self> {
+        let m = if at < self.c {
+            Merge { c: self.c - 1, ..self }
+        } else if at < self.c + self.gs {
+            Merge { gs: self.gs - 1, ..self }
+        } else {
+            self
+        };
+        (m.rs > 1 || m.gs > 1).then_some(m)
+    }
+}
+
 /// A table style defined in the file (`ppt/tableStyles.xml`), as PowerPoint writes the built-in
 /// styles a deck uses: how each part of a table (whole table, banded rows and columns, first and
 /// last rows and columns, corner cells) is filled, bordered and lettered.
@@ -329,6 +460,97 @@ pub fn table_styles() -> Vec<(String, String)> {
 mod tests {
     use super::*;
 
+    /// Every cell is owned by exactly one anchor (itself or a span over it), and no span leaves the grid.
+    fn assert_topology(t: &Table) {
+        let (nr, nc) = (t.n_rows(), t.n_cols());
+        let mut owner = vec![vec![0u32; nc]; nr];
+        for (r, row) in t.rows.iter().enumerate() {
+            assert_eq!(row.cells.len(), nc);
+            for (c, cell) in row.cells.iter().enumerate() {
+                if cell.is_covered() {
+                    assert_eq!((cell.grid_span, cell.row_span), (1, 1), "covered ({r},{c}) has spans");
+                    continue;
+                }
+                let (rs, gs) = (cell.row_span as usize, cell.grid_span as usize);
+                assert!(r + rs <= nr && c + gs <= nc, "span at ({r},{c}) leaves the grid");
+                for o in owner.iter_mut().skip(r).take(rs) {
+                    for x in o.iter_mut().skip(c).take(gs) {
+                        *x += 1;
+                    }
+                }
+            }
+        }
+        for (r, o) in owner.iter().enumerate() {
+            for (c, n) in o.iter().enumerate() {
+                assert_eq!(*n, 1, "cell ({r},{c}) owned {n} times");
+            }
+        }
+    }
+
+    fn merged() -> Table {
+        // 4x4 with a 2x2 merge at (1,1) holding "M".
+        let mut t = Table::new(4, 4, 400.0, 30.0);
+        if let Some(c) = t.cell_mut(1, 1) {
+            c.text = TextBody::from_text("M");
+        }
+        assert!(t.merge(1, 1, 2, 2));
+        assert_topology(&t);
+        t
+    }
+
+    fn anchor_text(t: &Table, r: usize, c: usize) -> String {
+        t.cell(r, c).unwrap().text.text()
+    }
+
+    #[test]
+    fn row_and_column_edits_keep_merges_consistent() {
+        for at in 0..=4 {
+            let mut t = merged();
+            t.insert_row(at);
+            assert_topology(&t);
+            let mut t = merged();
+            t.insert_col(at);
+            assert_topology(&t);
+        }
+        for at in 0..4 {
+            let mut t = merged();
+            assert!(t.delete_row(at));
+            assert_topology(&t);
+            let mut t = merged();
+            assert!(t.delete_col(at));
+            assert_topology(&t);
+        }
+    }
+
+    #[test]
+    fn inserting_inside_a_merge_grows_it() {
+        let mut t = merged();
+        t.insert_row(2);
+        let a = t.cell(1, 1).unwrap();
+        assert_eq!((a.row_span, a.grid_span), (3, 2));
+        assert!(t.cell(2, 2).unwrap().h_merge && t.cell(2, 2).unwrap().v_merge);
+        t.insert_col(0);
+        assert_eq!(t.cell(1, 2).unwrap().grid_span, 2);
+        assert_eq!(anchor_text(&t, 1, 2), "M");
+        assert_topology(&t);
+    }
+
+    #[test]
+    fn deleting_the_anchor_row_or_column_keeps_the_text() {
+        let mut t = merged();
+        assert!(t.delete_row(1));
+        let a = t.cell(1, 1).unwrap();
+        assert!(!a.is_covered());
+        assert_eq!((a.row_span, a.grid_span), (1, 2));
+        assert_eq!(anchor_text(&t, 1, 1), "M");
+        assert!(t.delete_col(1));
+        let a = t.cell(1, 1).unwrap();
+        assert!(!a.is_covered());
+        assert_eq!((a.row_span, a.grid_span), (1, 1));
+        assert_eq!(anchor_text(&t, 1, 1), "M");
+        assert_topology(&t);
+    }
+
     #[test]
     fn insert_delete_merge_split() {
         let mut t = Table::new(3, 3, 300.0, 30.0);

From 272ab5f96f83c9dc4794518f097a6b8ae2524f59 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:47:27 +0300
Subject: [PATCH 124/376] Edit: copies remap media, connector ends, animation
 targets and triggers (#406)

Paste added clashing media under a fresh id but left the pasted shapes on the
old id, reid did not touch connector ends despite its comment, pasted slides
kept animations on the original shape ids, and slide.duplicate remapped
animation targets but not triggers.

- reid returns the old-to-new shape map; connector ends on a copied shape
  follow the copy, ends on a shape outside the copied set are detached.
- remap_animations points targets and triggers at the copies (an animation
  whose target wasn't copied is dropped, an uncopied trigger cleared); used
  by slide paste and slide.duplicate.
- bring_media returns the media ids it had to change and paste rewrites the
  shapes (and a pasted slide's picture background) to use them; slide copy
  now also carries a picture background's media.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/edit.rs  | 120 +++++++++++++++++++++++++-----
 crates/engine/src/cmd/slide.rs |  21 +-----
 crates/engine/src/tests.rs     | 131 +++++++++++++++++++++++++++++++++
 3 files changed, 236 insertions(+), 36 deletions(-)

diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 30437b15..3b886242 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -1,5 +1,6 @@
 //! Edit menu: undo/redo, clipboard, duplicate, delete, select all.
 
+use std::collections::HashMap;
 use std::sync::Arc;
 
 use deckcraft_model::{MediaId, Shape, ShapeId, Slide, SlideId};
@@ -87,6 +88,9 @@ fn copy_inner(s: &mut Session, p: &Value) -> Result<String> {
         let mut mids = vec![];
         for sl in &slides {
             media_of_shapes(&sl.shapes, &mut mids);
+            if let Some(deckcraft_model::Background::Fill { fill: deckcraft_model::Fill::Picture(pf) }) = &sl.background {
+                mids.push(pf.media);
+            }
         }
         let media = st.doc.media.iter().filter(|m| mids.contains(&m.id)).cloned().collect();
         let plain = slides.iter().map(|x| x.title()).collect::<Vec<_>>().join("\n");
@@ -125,34 +129,106 @@ fn cut(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"text": t}))
 }
 
-/// Give pasted shapes fresh ids (groups included) and map connector ends.
-pub(crate) fn reid(doc: &mut deckcraft_model::Presentation, shapes: &mut [Shape]) {
-    fn rec(doc: &mut deckcraft_model::Presentation, shapes: &mut [Shape], depth: usize) {
+/// Give pasted shapes fresh ids (groups included) and return the old-to-new map. Connector ends
+/// attached to a shape that was copied too follow its copy; ends attached to a shape outside the
+/// copied set are detached (the connector keeps its geometry), so a copy never stays glued to
+/// the original or to an unrelated shape that happens to share an id in another deck.
+pub(crate) fn reid(doc: &mut deckcraft_model::Presentation, shapes: &mut [Shape]) -> HashMap<ShapeId, ShapeId> {
+    fn rec(doc: &mut deckcraft_model::Presentation, shapes: &mut [Shape], map: &mut HashMap<ShapeId, ShapeId>, depth: usize) {
         if depth > 64 {
             return;
         }
         for s in shapes {
-            s.id = ShapeId(doc.alloc_id());
+            let id = ShapeId(doc.alloc_id());
+            map.insert(s.id, id);
+            s.id = id;
             if let Some(ch) = s.children_mut() {
-                rec(doc, ch, depth + 1);
+                rec(doc, ch, map, depth + 1);
             }
         }
     }
-    rec(doc, shapes, 0);
+    let mut map = HashMap::new();
+    rec(doc, shapes, &mut map, 0);
+    walk_mut(shapes, &mut |s| {
+        if let deckcraft_model::ShapeKind::Connector { start, end } = &mut s.kind {
+            for e in [start, end] {
+                *e = e.and_then(|(id, site)| map.get(&id).map(|n| (*n, site)));
+            }
+        }
+    });
+    map
 }
 
-fn bring_media(doc: &mut deckcraft_model::Presentation, media: &[deckcraft_model::MediaItem]) {
-    for m in media {
-        if doc.media(m.id).is_none_or(|x| x.data != m.data) {
-            if doc.media(m.id).is_none() {
-                doc.media.push(m.clone());
-            } else {
-                // Id clash with different bytes: unusual (other deck); keep ours, add theirs as new.
-                let id = doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone());
-                let _ = id;
+/// Point copied animations at the copies: targets and triggers in `map` follow it; an animation
+/// whose target wasn't copied is dropped, and a trigger that wasn't copied is cleared.
+pub(crate) fn remap_animations(anims: &mut Vec<deckcraft_model::Animation>, map: &HashMap<ShapeId, ShapeId>) {
+    anims.retain_mut(|a| {
+        let Some(n) = map.get(&a.shape) else { return false };
+        a.shape = *n;
+        a.trigger = a.trigger.and_then(|t| map.get(&t).copied());
+        true
+    });
+}
+
+/// Visit every shape mutably, depth-first (groups included, depth-bounded like `walk`).
+fn walk_mut(shapes: &mut [Shape], f: &mut dyn FnMut(&mut Shape)) {
+    fn rec(shapes: &mut [Shape], f: &mut dyn FnMut(&mut Shape), depth: usize) {
+        if depth > 64 {
+            return;
+        }
+        for s in shapes {
+            f(s);
+            if let Some(ch) = s.children_mut() {
+                rec(ch, f, depth + 1);
             }
         }
     }
+    rec(shapes, f, 0);
+}
+
+/// Rewrite the media ids shapes use (`map`: clipboard id to destination id).
+fn remap_media(shapes: &mut [Shape], map: &HashMap<MediaId, MediaId>) {
+    if map.is_empty() {
+        return;
+    }
+    let m = |id: &mut MediaId| {
+        if let Some(n) = map.get(id) {
+            *id = *n;
+        }
+    };
+    walk_mut(shapes, &mut |s| {
+        match &mut s.kind {
+            deckcraft_model::ShapeKind::Picture { fill } => m(&mut fill.media),
+            deckcraft_model::ShapeKind::Media(c) => {
+                m(&mut c.media);
+                if let Some(p) = c.poster.as_mut() {
+                    m(p);
+                }
+            }
+            deckcraft_model::ShapeKind::Opaque { preview: Some(p), .. } => m(p),
+            _ => {}
+        }
+        if let Some(deckcraft_model::Fill::Picture(pf)) = &mut s.fill {
+            m(&mut pf.media);
+        }
+    });
+}
+
+/// Add the clipboard's media to `doc` and return the ids that changed: an id already used in
+/// `doc` by other bytes (another deck) gets a fresh id, and the pasted shapes must use it.
+fn bring_media(doc: &mut deckcraft_model::Presentation, media: &[deckcraft_model::MediaItem]) -> HashMap<MediaId, MediaId> {
+    let mut map = HashMap::new();
+    for m in media {
+        match doc.media(m.id) {
+            None => doc.media.push(m.clone()),
+            Some(x) if x.data == m.data => {}
+            Some(_) => {
+                let id = doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone());
+                map.insert(m.id, id);
+            }
+        }
+    }
+    map
 }
 
 fn paste(s: &mut Session, p: &Value) -> Result<Value> {
@@ -174,12 +250,19 @@ fn paste(s: &mut Session, p: &Value) -> Result<Value> {
     if !clip.slides.is_empty() {
         let at = s.doc()?.selection.slide + 1;
         return s.edit(|doc, sel| {
-            bring_media(doc, &clip.media);
+            let media = bring_media(doc, &clip.media);
             let mut new_ids = vec![];
             for (k, sl) in clip.slides.iter().enumerate() {
                 let mut sl = sl.clone();
                 sl.id = SlideId(doc.alloc_id());
-                reid(doc, &mut sl.shapes);
+                let map = reid(doc, &mut sl.shapes);
+                remap_animations(&mut sl.animations, &map);
+                remap_media(&mut sl.shapes, &media);
+                if let Some(deckcraft_model::Background::Fill { fill: deckcraft_model::Fill::Picture(pf) }) = &mut sl.background
+                    && let Some(n) = media.get(&pf.media)
+                {
+                    pf.media = *n;
+                }
                 if doc.layout(sl.layout).is_none() {
                     sl.layout = doc.masters.first().and_then(|m| m.layouts.first()).map(|l| l.id).unwrap_or_default();
                 }
@@ -200,9 +283,10 @@ fn paste(s: &mut Session, p: &Value) -> Result<Value> {
         let same_slide = s.doc().ok().is_some_and(|d| clip.shapes.iter().any(|c| d.shape(c.id).is_some()));
         let off = if same_slide { off } else { 0.0 };
         return s.edit(|doc, sel| {
-            bring_media(doc, &clip.media);
+            let media = bring_media(doc, &clip.media);
             let mut shapes = clip.shapes.clone();
             reid(doc, &mut shapes);
+            remap_media(&mut shapes, &media);
             for sh in &mut shapes {
                 if let Some(x) = sh.xfrm.as_mut() {
                     x.x += off;
diff --git a/crates/engine/src/cmd/slide.rs b/crates/engine/src/cmd/slide.rs
index 3d8ad344..bc116a4f 100644
--- a/crates/engine/src/cmd/slide.rs
+++ b/crates/engine/src/cmd/slide.rs
@@ -166,24 +166,9 @@ fn duplicate(s: &mut Session, p: &Value) -> Result<Value> {
             let Some(src) = doc.slides.get(*i).map(|x| x.as_ref().clone()) else { continue };
             let mut copy = src;
             copy.id = SlideId(doc.alloc_id());
-            super::edit::reid(doc, &mut copy.shapes);
-            // Animations follow the new shape ids by position.
-            let old_ids: Vec<_> = doc
-                .slides
-                .get(*i)
-                .map(|x| {
-                    let mut v = vec![];
-                    deckcraft_model::walk(&x.shapes, &mut |sh, _| v.push(sh.id));
-                    v
-                })
-                .unwrap_or_default();
-            let mut new_shape_ids = vec![];
-            deckcraft_model::walk(&copy.shapes, &mut |sh, _| new_shape_ids.push(sh.id));
-            for a in &mut copy.animations {
-                if let Some(pos) = old_ids.iter().position(|x| *x == a.shape) {
-                    a.shape = new_shape_ids.get(pos).copied().unwrap_or(a.shape);
-                }
-            }
+            // Animations follow the new shape ids, triggers included.
+            let map = super::edit::reid(doc, &mut copy.shapes);
+            super::edit::remap_animations(&mut copy.animations, &map);
             let section = doc.section_of(src_id(doc, *i));
             let at = (last + 1 + k).min(doc.slides.len());
             new_ids.push(copy.id);
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..b9ebd1c6 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,134 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+mod copy_remap {
+    use std::sync::Arc;
+
+    use deckcraft_model::style::PictureFill;
+    use deckcraft_model::{Animation, Shape, ShapeId, ShapeKind, Xfrm};
+    use serde_json::json;
+
+    use crate::*;
+
+    /// Slide 0 of `s` gets a picture of `bytes`, a box, and a connector from the picture to the box.
+    /// Returns (picture, box, connector).
+    fn populate(s: &mut Session, bytes: &[u8]) -> (ShapeId, ShapeId, ShapeId) {
+        let st = s.doc_mut().unwrap();
+        let doc = Arc::make_mut(&mut st.doc);
+        let media = doc.add_media("p.png", "image/png", bytes.to_vec());
+        let (p, b, c) = (ShapeId(doc.alloc_id()), ShapeId(doc.alloc_id()), ShapeId(doc.alloc_id()));
+        let x = Some(Xfrm::new(10.0, 10.0, 50.0, 50.0));
+        let slide = Arc::make_mut(&mut doc.slides[0]);
+        slide.shapes.push(Shape {
+            id: p,
+            kind: ShapeKind::Picture { fill: PictureFill { media, ..Default::default() } },
+            xfrm: x,
+            ..Default::default()
+        });
+        slide.shapes.push(Shape { id: b, xfrm: x, ..Default::default() });
+        slide.shapes.push(Shape { id: c, kind: ShapeKind::Connector { start: Some((p, 1)), end: Some((b, 3)) }, xfrm: x, ..Default::default() });
+        (p, b, c)
+    }
+
+    fn select(s: &mut Session, ids: &[ShapeId]) {
+        let sel = &mut s.doc_mut().unwrap().selection;
+        sel.slides.clear();
+        sel.shapes = ids.to_vec();
+    }
+
+    fn shape(s: &Session, slide: usize, id: ShapeId) -> Shape {
+        let d = s.doc().unwrap();
+        d.doc.slides[slide].shapes.iter().find(|x| x.id == id).cloned().unwrap()
+    }
+
+    fn picture_bytes(s: &Session, sh: &Shape) -> Vec<u8> {
+        let ShapeKind::Picture { fill } = &sh.kind else { panic!("not a picture") };
+        s.doc().unwrap().doc.media(fill.media).unwrap().data.as_ref().clone()
+    }
+
+    #[test]
+    fn paste_into_a_deck_with_a_colliding_media_id_shows_the_copied_picture() {
+        let mut a = Session::with_new();
+        let mut b = Session::with_new();
+        let (pa, ..) = populate(&mut a, b"deck a picture");
+        let (pb, ..) = populate(&mut b, b"deck b picture");
+        assert_eq!(picture_bytes(&a, &shape(&a, 0, pa)), b"deck a picture");
+        select(&mut a, &[pa]);
+        a.execute("edit.copy", &json!({})).unwrap();
+        b.clipboard = a.clipboard.clone();
+        b.doc_mut().unwrap().selection.shapes.clear();
+        let r = b.execute("edit.paste", &json!({})).unwrap();
+        let new = ShapeId(r["ids"][0].as_u64().unwrap() as u32);
+        assert_eq!(picture_bytes(&b, &shape(&b, 0, new)), b"deck a picture");
+        // Deck b's own picture is untouched.
+        assert_eq!(picture_bytes(&b, &shape(&b, 0, pb)), b"deck b picture");
+    }
+
+    #[test]
+    fn copied_connectors_follow_copied_ends_and_detach_from_the_rest() {
+        let mut s = Session::with_new();
+        let (p, b, c) = populate(&mut s, b"x");
+        // Both ends copied: the copy connects the copies.
+        let r = s.execute("edit.duplicate", &json!({"ids": [p.0, b.0, c.0]})).unwrap();
+        let ids: Vec<ShapeId> = r["ids"].as_array().unwrap().iter().map(|v| ShapeId(v.as_u64().unwrap() as u32)).collect();
+        let ShapeKind::Connector { start, end } = shape(&s, 0, ids[2]).kind else { panic!() };
+        assert_eq!((start, end), (Some((ids[0], 1)), Some((ids[1], 3))));
+        // Only the connector copied: it doesn't stay glued to the originals.
+        select(&mut s, &[c]);
+        s.execute("edit.copy", &json!({})).unwrap();
+        s.doc_mut().unwrap().selection.shapes.clear();
+        let r = s.execute("edit.paste", &json!({})).unwrap();
+        let only = ShapeId(r["ids"][0].as_u64().unwrap() as u32);
+        let ShapeKind::Connector { start, end } = shape(&s, 0, only).kind else { panic!() };
+        assert_eq!((start, end), (None, None));
+        // The original keeps its ends.
+        let ShapeKind::Connector { start, .. } = shape(&s, 0, c).kind else { panic!() };
+        assert_eq!(start, Some((p, 1)));
+    }
+
+    fn triggered(s: &mut Session, target: ShapeId, trigger: ShapeId) {
+        let st = s.doc_mut().unwrap();
+        let doc = Arc::make_mut(&mut st.doc);
+        Arc::make_mut(&mut doc.slides[0]).animations.push(Animation {
+            shape: target,
+            trigger: Some(trigger),
+            effect: "fade".into(),
+            ..Default::default()
+        });
+    }
+
+    fn resolves(s: &Session, slide: usize) -> (ShapeId, ShapeId) {
+        let d = s.doc().unwrap();
+        let sl = &d.doc.slides[slide];
+        let a = &sl.animations[0];
+        let t = a.trigger.unwrap();
+        assert!(sl.shapes.iter().any(|x| x.id == a.shape) && sl.shapes.iter().any(|x| x.id == t), "{a:?}");
+        (a.shape, t)
+    }
+
+    #[test]
+    fn duplicated_and_pasted_slides_retarget_animations_and_triggers() {
+        let mut s = Session::with_new();
+        let (p, b, _) = populate(&mut s, b"x");
+        triggered(&mut s, p, b);
+        s.execute("slide.duplicate", &json!({"index": 0})).unwrap();
+        let (t, tr) = resolves(&s, 1);
+        assert!(t != p && tr != b);
+        // Pasted slide.
+        s.execute("edit.copy", &json!({"scope": "slides"})).unwrap();
+        s.execute("edit.paste", &json!({"scope": "slides"})).unwrap();
+        let n = s.doc().unwrap().doc.slides.len();
+        let (t2, tr2) = resolves(&s, n - 1);
+        assert!(t2 != t && tr2 != tr);
+        // Save and reload keeps them resolving.
+        let bytes = crate::cmd::file::save_bytes(&s.doc().unwrap().doc, "deckcraft").unwrap();
+        let back = deckcraft_format::load(&bytes).unwrap();
+        for sl in &back.slides {
+            for a in &sl.animations {
+                assert!(sl.shapes.iter().any(|x| x.id == a.shape));
+                assert!(a.trigger.is_none_or(|t| sl.shapes.iter().any(|x| x.id == t)));
+            }
+        }
+    }
+}

From ce878ef74ee1a05be27786acaf601461da14e64c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:49:02 +0300
Subject: [PATCH 125/376] Render: budget shape path-gradient work on dense
 outlines (#404)

A shape path gradient tested every raster pixel against every flattened
outline edge, so an outline with tens of thousands of segments cost
billions of tests and stalled rendering. The outline is now simplified
before rasterising so pixels x edges stays under 64M: points closer than
a raster pixel are dropped first, then every k-th point is kept, with
each polygon left closed and at least 8 edges.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/render/src/pathgrad.rs | 122 +++++++++++++++++++++++++++++++++-
 1 file changed, 121 insertions(+), 1 deletion(-)

diff --git a/crates/render/src/pathgrad.rs b/crates/render/src/pathgrad.rs
index 7402ab2c..168d9e0a 100644
--- a/crates/render/src/pathgrad.rs
+++ b/crates/render/src/pathgrad.rs
@@ -18,6 +18,13 @@ use vello_cpu::{Pixmap, RenderContext, peniko};
 /// Longest side of the rasterised gradient, in pixels (bilinear sampling smooths the rest).
 const MAX_SIDE: f64 = 384.0;
 
+/// Most pixel × outline-edge tests one `shape` gradient may cost; a denser outline is simplified
+/// to fit (each pixel tests every edge).
+const MAX_EDGE_WORK: u64 = 64_000_000;
+
+/// Fewest edges a simplified polygon keeps, so a coarse outline still has a shape.
+const MIN_POLY_EDGES: usize = 8;
+
 /// Colour position (0 at the focus, 1 at the edge) of `p` for path `kind` in `bounds` with the
 /// focus rect `focus` (fractions inset from left, top, right, bottom), `outline` being the
 /// shape's flattened polygon(s) for `shape`.
@@ -136,6 +143,65 @@ pub fn polygons(path: &BezPath) -> Vec<Vec<Point>> {
     out
 }
 
+/// `outline` cut down to at most about `max_edges` edges in total: first by dropping points
+/// closer than `tol` to the last kept one (detail finer than a raster pixel), then, if still too
+/// many, by keeping every k-th point. Each polygon stays closed. Returns it unchanged when it fits.
+fn simplify(outline: Vec<Vec<Point>>, tol: f64, max_edges: usize) -> Vec<Vec<Point>> {
+    let edges = |o: &[Vec<Point>]| o.iter().map(|p| p.len().saturating_sub(1)).sum::<usize>();
+    if edges(&outline) <= max_edges {
+        return outline;
+    }
+    let tol = if tol.is_finite() && tol > 0.0 { tol } else { 0.0 };
+    let mut out: Vec<Vec<Point>> = outline
+        .into_iter()
+        .map(|poly| {
+            let mut kept: Vec<Point> = Vec::with_capacity(poly.len());
+            let last = poly.last().copied();
+            for p in poly {
+                if kept.last().is_none_or(|q| (p - *q).hypot() >= tol) {
+                    kept.push(p);
+                }
+            }
+            if let (Some(l), Some(k)) = (last, kept.last().copied())
+                && k != l
+            {
+                kept.push(l);
+            }
+            kept
+        })
+        .filter(|p| p.len() > 2)
+        .collect();
+    let total = edges(&out);
+    if total > max_edges {
+        let k = total.div_ceil(max_edges.max(1)).max(2);
+        for poly in &mut out {
+            let n = poly.len();
+            if n <= MIN_POLY_EDGES + 1 {
+                continue;
+            }
+            let k = k.min((n - 1) / MIN_POLY_EDGES).max(1);
+            let last = poly.last().copied();
+            let mut kept: Vec<Point> = poly.iter().step_by(k).copied().collect();
+            if let (Some(l), Some(q)) = (last, kept.last().copied())
+                && q != l
+            {
+                kept.push(l);
+            }
+            *poly = kept;
+        }
+        // Polygons too small to thin stay whole; drop the smallest ones if they alone overflow.
+        if edges(&out) > max_edges {
+            out.sort_by_key(|p| std::cmp::Reverse(p.len()));
+            let mut sum = 0usize;
+            out.retain(|p| {
+                sum = sum.saturating_add(p.len().saturating_sub(1));
+                sum <= max_edges
+            });
+        }
+    }
+    out
+}
+
 /// A 256-entry colour ramp for the sorted, already expanded `stops` (linear in sRGB between them).
 pub fn ramp(stops: &[(f64, Rgba)]) -> Vec<Rgba> {
     (0..256)
@@ -166,7 +232,14 @@ pub fn fill(ctx: &mut RenderContext, kind: &str, focus: [f64; 4], stops: &[(f64,
     let longest = bounds.width().max(bounds.height()) * k;
     let s = (MAX_SIDE / longest).min(1.0) * k;
     let (pw, ph) = (((bounds.width() * s).ceil() as u32).clamp(1, 4096), ((bounds.height() * s).ceil() as u32).clamp(1, 4096));
-    let outline = if kind == "shape" { polygons(path) } else { Vec::new() };
+    let outline = if kind == "shape" {
+        let pixels = u64::from(pw).saturating_mul(u64::from(ph)).max(1);
+        let max_edges = usize::try_from(MAX_EDGE_WORK / pixels).unwrap_or(usize::MAX).max(MIN_POLY_EDGES);
+        let pixel = (bounds.width() / f64::from(pw)).min(bounds.height() / f64::from(ph));
+        simplify(polygons(path), pixel, max_edges)
+    } else {
+        Vec::new()
+    };
     let lut = ramp(stops);
     let a = alpha.clamp(0.0, 1.0);
     let mut data = Vec::with_capacity((pw * ph) as usize);
@@ -252,6 +325,53 @@ mod tests {
         assert!((half - 0.5).abs() < 0.02, "{half}");
     }
 
+    fn many_segment_square(n: usize) -> BezPath {
+        // A 200x200 square whose sides are split into `n` segments each.
+        let mut p = BezPath::new();
+        p.move_to((0.0, 0.0));
+        let corners = [(200.0, 0.0), (200.0, 200.0), (0.0, 200.0), (0.0, 0.0)];
+        let mut from = (0.0, 0.0);
+        for to in corners {
+            for i in 1..=n {
+                let t = i as f64 / n as f64;
+                p.line_to((from.0 + (to.0 - from.0) * t, from.1 + (to.1 - from.1) * t));
+            }
+            from = to;
+        }
+        p.close_path();
+        p
+    }
+
+    #[test]
+    fn dense_outlines_are_simplified_to_the_work_budget() {
+        // Below the per-polygon flatten cap, so the simplifier has to do the work.
+        let polys = polygons(&many_segment_square(20_000));
+        assert!(polys.iter().map(|p| p.len() - 1).sum::<usize>() >= 80_000);
+        let b = Rect::new(0.0, 0.0, 200.0, 200.0);
+        let simple = simplify(polys, 200.0 / 384.0, 400);
+        let edges: usize = simple.iter().map(|p| p.len() - 1).sum();
+        assert!((MIN_POLY_EDGES..=400).contains(&edges), "{edges}");
+        // Still the square: half way to a side or a corner is 0.5.
+        for q in [Point::new(150.0, 100.0), Point::new(150.0, 150.0), Point::new(100.0, 50.0)] {
+            let t = position("shape", b, CENTRE, &simple, q);
+            assert!((t - 0.5).abs() < 0.01, "{q:?} {t}");
+        }
+        // Small outlines pass through untouched.
+        let tri = vec![vec![Point::new(0.0, 0.0), Point::new(1.0, 0.0), Point::new(0.0, 1.0), Point::new(0.0, 0.0)]];
+        assert_eq!(simplify(tri.clone(), 10.0, 400), tri);
+    }
+
+    #[test]
+    fn a_dense_shape_gradient_renders_promptly() {
+        let path = many_segment_square(20_000);
+        let mut ctx = RenderContext::new(400, 400);
+        let stops = [(0.0, Rgba::rgb(0, 0, 0)), (1.0, Rgba::rgb(255, 255, 255))];
+        let t = std::time::Instant::now();
+        fill(&mut ctx, "shape", CENTRE, &stops, Rect::new(0.0, 0.0, 200.0, 200.0), &path, Affine::scale(2.0), 1.0);
+        // Unbudgeted this is 147k pixels × 80k edges ≈ 1.2e10 tests (minutes); budgeted, well under a second in release.
+        assert!(t.elapsed() < std::time::Duration::from_secs(20), "{:?}", t.elapsed());
+    }
+
     #[test]
     fn the_ramp_runs_through_the_stops() {
         let stops = [(0.0, Rgba::rgb(0, 0, 0)), (0.5, Rgba::rgb(128, 128, 128)), (1.0, Rgba::rgb(255, 255, 255))];

From cb26e7a04fc77bd02f05ea6922e73d74f91e2d5e Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:52:15 +0300
Subject: [PATCH 126/376] Text: bidi levels for language runs in linear time
 (#403)

Currency and percent signs in right-to-left runs looked ahead through the
whole ET run for every sign, and each neutral span searched both ways for
the nearest strong direction. Both are now precomputed or carried along, so
a long run of signs or many short neutral spans cost linear work. The old
code stays in the tests as a reference and 4000 random paragraphs match it.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/text/src/bidi.rs | 218 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 214 insertions(+), 4 deletions(-)

diff --git a/crates/text/src/bidi.rs b/crates/text/src/bidi.rs
index 3be4db3e..ac9b3afd 100644
--- a/crates/text/src/bidi.rs
+++ b/crates/text/src/bidi.rs
@@ -102,7 +102,9 @@ pub(crate) fn levels_lang(text: &str, chars: &[char], rtl: bool, rtl_lang: &[boo
         }
     }
     // W4/W5 in right-to-left runs: a separator between digits, and currency or percent signs next
-    // to them, belong to the number.
+    // to them, belong to the number. `after_et[i]` is the first index after `i` that is not ET,
+    // computed once so a long run of currency signs costs linear work, not a scan per sign.
+    let after_et = next_non_et(&cls);
     for i in 0..n {
         if !rl(i) || dir.get(i) != Some(&Dir::Open) {
             continue;
@@ -111,7 +113,7 @@ pub(crate) fn levels_lang(text: &str, chars: &[char], rtl: bool, rtl_lang: &[boo
         let num = |j: Option<usize>| j.and_then(|j| dir.get(j)).is_some_and(|d| *d == Dir::Num);
         let joined = match c {
             ES | CS => num(i.checked_sub(1)) && num(Some(i + 1)),
-            ET => num(i.checked_sub(1)) || (i + 1..n).find(|&j| cls.get(j) != Some(&ET)).is_some_and(|j| num(Some(j))),
+            ET => num(i.checked_sub(1)) || num(after_et.get(i).copied().flatten()),
             _ => false,
         };
         if joined && let Some(x) = dir.get_mut(i) {
@@ -135,9 +137,21 @@ pub(crate) fn levels_lang(text: &str, chars: &[char], rtl: bool, rtl_lang: &[boo
         Some(Dir::R | Dir::Num) => Some(Dir::R),
         _ => None,
     };
+    // Resolving a span only changes characters before the scan position, so the nearest strong
+    // direction after a span can be computed once up front, and the one before it is carried along:
+    // linear work however many neutral spans the paragraph has.
+    let mut next_strong: Vec<Option<Dir>> = vec![None; n + 1];
+    for j in (0..n).rev() {
+        let here = strong_at(&dir, j).or(next_strong.get(j + 1).copied().flatten());
+        if let Some(x) = next_strong.get_mut(j) {
+            *x = here;
+        }
+    }
+    let mut last_strong: Option<Dir> = None;
     let mut i = 0;
     while i < n {
         if !(rl(i) && dir.get(i) == Some(&Dir::Open)) {
+            last_strong = strong_at(&dir, i).or(last_strong);
             i += 1;
             continue;
         }
@@ -145,12 +159,15 @@ pub(crate) fn levels_lang(text: &str, chars: &[char], rtl: bool, rtl_lang: &[boo
         while i < n && rl(i) && dir.get(i) == Some(&Dir::Open) {
             i += 1;
         }
-        let before = (0..start).rev().find_map(|j| strong_at(&dir, j)).unwrap_or(sos);
-        let after = (i..n).find_map(|j| strong_at(&dir, j)).unwrap_or(sos);
+        let before = last_strong.unwrap_or(sos);
+        let after = next_strong.get(i).copied().flatten().unwrap_or(sos);
         let d = if before == after { before } else { Dir::R };
         for x in dir.get_mut(start..i).into_iter().flatten() {
             *x = d;
         }
+        if start < i {
+            last_strong = Some(if d == Dir::Num { Dir::R } else { d });
+        }
     }
     // Spaces in left-to-right runs follow the character before them.
     let mut prev = Dir::L;
@@ -170,6 +187,21 @@ pub(crate) fn levels_lang(text: &str, chars: &[char], rtl: bool, rtl_lang: &[boo
         .collect()
 }
 
+/// For each index, the first later index whose class is not ET (`None` when only ET follows).
+fn next_non_et(cls: &[BidiClass]) -> Vec<Option<usize>> {
+    let mut out = vec![None; cls.len()];
+    let mut next = None;
+    for i in (0..cls.len()).rev() {
+        if let Some(x) = out.get_mut(i) {
+            *x = next;
+        }
+        if cls.get(i) != Some(&ET) {
+            next = Some(i);
+        }
+    }
+    out
+}
+
 /// Whitespace-like for rule L1: reset to the paragraph level when trailing a line or preceding a
 /// segment/paragraph separator.
 fn l1_whitespace(c: BidiClass) -> bool {
@@ -326,4 +358,182 @@ mod tests {
         assert_eq!(visual_order(&[1, 2, 2, 1]), vec![3, 1, 2, 0]);
         assert_eq!(visual_order(&[125, 125]), vec![1, 0]);
     }
+
+    /// The pre-#403 `levels_lang`, kept as the reference the linear version must match.
+    fn reference_levels_lang(text: &str, chars: &[char], rtl: bool, rtl_lang: &[bool]) -> Vec<u8> {
+        let base = u8::from(rtl);
+        let any_rtl_lang = rtl_lang.iter().any(|r| *r);
+        if !rtl && !any_rtl_lang && !needs_bidi(chars) {
+            return vec![0; chars.len()];
+        }
+        let classes: Vec<BidiClass> = chars.iter().map(|c| bidi_class(*c)).collect();
+        if classes.iter().any(|c| matches!(c, LRE | RLE | LRO | RLO | PDF | LRI | RLI | FSI | PDI)) {
+            return levels(text, chars, rtl);
+        }
+        let n = chars.len();
+        let rl = |i: usize| rtl_lang.get(i).copied().unwrap_or(false);
+        let sos = if rtl { Dir::R } else { Dir::L };
+        // W1: combining marks take the class of the character they sit on.
+        let mut cls = classes;
+        for i in 0..n {
+            if cls.get(i) == Some(&NSM) {
+                let prev = if i == 0 { if rtl { R } else { L } } else { cls.get(i - 1).copied().unwrap_or(L) };
+                if let Some(c) = cls.get_mut(i) {
+                    *c = prev;
+                }
+            }
+        }
+        let mut dir = vec![Dir::Open; n];
+        // Strong letters and digits.
+        let mut last_strong: Option<BidiClass> = None;
+        for i in 0..n {
+            let c = cls.get(i).copied().unwrap_or(ON);
+            let d = match c {
+                L => Dir::L,
+                R | AL => Dir::R,
+                AN => Dir::Num,
+                EN if !rl(i) => Dir::L,
+                // W7: European digits after left-to-right text are left to right.
+                EN if last_strong == Some(L) => Dir::L,
+                EN => Dir::Num,
+                _ => Dir::Open,
+            };
+            if matches!(c, L | R | AL) {
+                last_strong = Some(c);
+            }
+            if let Some(x) = dir.get_mut(i) {
+                *x = d;
+            }
+        }
+        // W4/W5 in right-to-left runs: a separator between digits, and currency or percent signs next
+        // to them, belong to the number.
+        for i in 0..n {
+            if !rl(i) || dir.get(i) != Some(&Dir::Open) {
+                continue;
+            }
+            let c = cls.get(i).copied().unwrap_or(ON);
+            let num = |j: Option<usize>| j.and_then(|j| dir.get(j)).is_some_and(|d| *d == Dir::Num);
+            let joined = match c {
+                ES | CS => num(i.checked_sub(1)) && num(Some(i + 1)),
+                ET => num(i.checked_sub(1)) || (i + 1..n).find(|&j| cls.get(j) != Some(&ET)).is_some_and(|j| num(Some(j))),
+                _ => false,
+            };
+            if joined && let Some(x) = dir.get_mut(i) {
+                *x = Dir::Num;
+            }
+        }
+        // Punctuation in left-to-right runs is left to right.
+        for i in 0..n {
+            if !rl(i)
+                && dir.get(i) == Some(&Dir::Open)
+                && !matches!(cls.get(i), Some(WS | S))
+                && let Some(x) = dir.get_mut(i)
+            {
+                *x = Dir::L;
+            }
+        }
+        // Neutrals in right-to-left runs: the direction around them when both sides agree, else
+        // right to left. Unresolved spaces of left-to-right runs are looked through.
+        let strong_at = |dir: &[Dir], j: usize| match dir.get(j) {
+            Some(Dir::L) => Some(Dir::L),
+            Some(Dir::R | Dir::Num) => Some(Dir::R),
+            _ => None,
+        };
+        let mut i = 0;
+        while i < n {
+            if !(rl(i) && dir.get(i) == Some(&Dir::Open)) {
+                i += 1;
+                continue;
+            }
+            let start = i;
+            while i < n && rl(i) && dir.get(i) == Some(&Dir::Open) {
+                i += 1;
+            }
+            let before = (0..start).rev().find_map(|j| strong_at(&dir, j)).unwrap_or(sos);
+            let after = (i..n).find_map(|j| strong_at(&dir, j)).unwrap_or(sos);
+            let d = if before == after { before } else { Dir::R };
+            for x in dir.get_mut(start..i).into_iter().flatten() {
+                *x = d;
+            }
+        }
+        // Spaces in left-to-right runs follow the character before them.
+        let mut prev = Dir::L;
+        for d in dir.iter_mut() {
+            if *d == Dir::Open {
+                *d = prev;
+            }
+            prev = if *d == Dir::Num { Dir::R } else { *d };
+        }
+        dir.iter()
+            .map(|d| match (d, base % 2 == 1) {
+                (Dir::L, false) | (Dir::R, true) => base,
+                (Dir::L, true) | (Dir::R, false) | (Dir::Open, _) => base + 1,
+                (Dir::Num, false) => base + 2,
+                (Dir::Num, true) => base + 1,
+            })
+            .collect()
+    }
+
+    fn lang(s: &str, rtl: bool, rtl_lang: &[bool]) -> Vec<u8> {
+        let chars: Vec<char> = s.chars().collect();
+        levels_lang(s, &chars, rtl, rtl_lang)
+    }
+
+    #[test]
+    fn next_non_et_points_past_each_et_run() {
+        let cls: Vec<BidiClass> = "a$$1%".chars().map(bidi_class).collect();
+        assert_eq!(next_non_et(&cls), vec![Some(3), Some(3), Some(3), None, None]);
+    }
+
+    #[test]
+    fn currency_signs_join_numbers_on_either_side_in_rtl_runs() {
+        // Hebrew word, then "$$5" and "5%%": the signs travel with the digits.
+        let s = "שלום $$5 5%% $$";
+        let n = s.chars().count();
+        let l = lang(s, true, &vec![true; n]);
+        let chars: Vec<char> = s.chars().collect();
+        let num = l[chars.iter().position(|c| *c == '5').unwrap()];
+        assert_eq!(&l[5..8], &[num; 3], "{l:?}");
+        assert_eq!(&l[9..12], &[num; 3], "{l:?}");
+        // Signs with no number next to them stay with the right-to-left text.
+        assert_eq!(l[13] % 2, 1);
+        assert_ne!(l[13], num);
+    }
+
+    #[test]
+    fn long_currency_and_neutral_runs_are_linear() {
+        // Quadratic resolution took minutes on these; linear finishes at once even unoptimised.
+        let n = 200_000;
+        let dollars: String = std::iter::once('ש').chain(std::iter::repeat_n('$', n)).collect();
+        let l = lang(&dollars, true, &vec![true; n + 1]);
+        assert!(l.iter().all(|v| v % 2 == 1));
+        // Alternating right-to-left-language neutrals and left-to-right-language spaces: many spans.
+        let s: String = std::iter::repeat_n("! ", n / 2).collect();
+        let langs: Vec<bool> = (0..n).map(|i| i % 2 == 0).collect();
+        assert_eq!(lang(&s, true, &langs).len(), n);
+    }
+
+    #[test]
+    fn matches_the_reference_on_random_mixed_text() {
+        let alphabet: Vec<char> = "aZש ب$%#+-,.:1٣ ()!\u{300}".chars().collect();
+        let mut seed = 0x2545_f491_u32;
+        let mut next = || {
+            seed ^= seed << 13;
+            seed ^= seed >> 17;
+            seed ^= seed << 5;
+            seed
+        };
+        for _ in 0..4000 {
+            let len = (next() % 24) as usize;
+            let chars: Vec<char> = (0..len).map(|_| alphabet[next() as usize % alphabet.len()]).collect();
+            let text: String = chars.iter().collect();
+            let langs: Vec<bool> = (0..len).map(|_| next() % 3 != 0).collect();
+            let rtl = next() % 2 == 0;
+            assert_eq!(
+                levels_lang(&text, &chars, rtl, &langs),
+                reference_levels_lang(&text, &chars, rtl, &langs),
+                "{text:?} rtl={rtl} langs={langs:?}"
+            );
+        }
+    }
 }

From 201ab63c48b2980d100958c545135946b36e59b6 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:52:20 +0300
Subject: [PATCH 127/376] Render: cap RGBA conversion and bound the
 failed-image cache (#402)

decode_at accepted up to 400 million pixels and then called to_rgba8, which
the decoder's allocation limit doesn't cover (a grey image converts to four
times its decoded size), and every picture that failed to decode was kept,
bytes and all, for the life of the process.

- Raster decodes check the RGBA size (512 MiB cap) from the header before
  decoding and again before the conversion.
- The failed-source cache keeps at most 256 entries and 64 MiB of encoded
  bytes, oldest forgotten first; a larger failed input isn't kept, and a hit
  must be the same Arc.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/render/src/images.rs | 125 ++++++++++++++++++++++++++++++++++--
 1 file changed, 118 insertions(+), 7 deletions(-)

diff --git a/crates/render/src/images.rs b/crates/render/src/images.rs
index f7d56c5d..24e6da08 100644
--- a/crates/render/src/images.rs
+++ b/crates/render/src/images.rs
@@ -1,7 +1,7 @@
 //! Decoded pictures shared by every render on this process, keyed by the media bytes' address and
 //! the requested size level and adjustments, so each picture is decoded once per size.
 
-use std::collections::HashMap;
+use std::collections::{HashMap, VecDeque};
 use std::sync::{Arc, Mutex};
 
 use deckcraft_model::style::PictureAdjust;
@@ -9,6 +9,17 @@ use vello_cpu::Pixmap;
 
 const BUDGET: usize = 512 << 20;
 
+/// Largest straight-RGBA picture a decode may produce (bytes, 4 per pixel). Checked from the
+/// header before decoding and again before the conversion to RGBA, which the decoder's own
+/// allocation limit doesn't cover (a grey image converts to four times its decoded size).
+const MAX_RGBA: u64 = 512 << 20;
+
+/// Pictures that failed to decode, remembered so they aren't retried every frame: at most this
+/// many, holding at most this many encoded bytes (oldest forgotten first). Larger failed inputs
+/// aren't kept at all.
+const BAD_MAX: usize = 256;
+const BAD_BUDGET: usize = 64 << 20;
+
 struct Entry {
     _bytes: Arc<Vec<u8>>,
     pm: Arc<Pixmap>,
@@ -20,7 +31,11 @@ struct Cache {
     map: HashMap<(usize, u32, u64), Entry>,
     bytes: usize,
     clock: u64,
+    /// Failed sources by address; each holds its bytes so the address can't be reused while it
+    /// is listed. `bad_order` is oldest first; `bad_bytes` their encoded size.
     bad: HashMap<usize, Arc<Vec<u8>>>,
+    bad_order: VecDeque<usize>,
+    bad_bytes: usize,
     /// GIFs by bytes address and adjustments (`None`: not animated); the bytes stay alive with them.
     anims: HashMap<(usize, u64), (Arc<Vec<u8>>, Option<Arc<Anim>>)>,
 }
@@ -115,9 +130,47 @@ fn decode_at(bytes: &[u8], side: u32) -> Option<image::RgbaImage> {
     if crate::metafile::is_metafile(bytes) {
         return crate::metafile::rasterize(bytes, side);
     }
+    decode_raster(bytes, MAX_RGBA)
+}
+
+impl Cache {
+    /// Remember that `bytes` doesn't decode, within [`BAD_MAX`] and [`BAD_BUDGET`].
+    fn mark_bad(&mut self, addr: usize, bytes: &Arc<Vec<u8>>) {
+        if bytes.len() > BAD_BUDGET || self.bad.contains_key(&addr) {
+            return;
+        }
+        while self.bad.len() >= BAD_MAX || self.bad_bytes + bytes.len() > BAD_BUDGET {
+            let Some(old) = self.bad_order.pop_front() else { break };
+            if let Some(b) = self.bad.remove(&old) {
+                self.bad_bytes = self.bad_bytes.saturating_sub(b.len());
+            }
+        }
+        self.bad.insert(addr, bytes.clone());
+        self.bad_order.push_back(addr);
+        self.bad_bytes += bytes.len();
+    }
+
+    fn is_bad(&self, addr: usize, bytes: &Arc<Vec<u8>>) -> bool {
+        self.bad.get(&addr).is_some_and(|b| Arc::ptr_eq(b, bytes))
+    }
+}
+
+/// Whether a `w` × `h` picture fits [`MAX_RGBA`] (`max`: the cap in bytes).
+fn fits(w: u32, h: u32, max: u64) -> bool {
+    w > 0 && h > 0 && (w as u64) * (h as u64) * 4 <= max
+}
+
+/// Decode a raster picture to RGBA, refusing (before decoding, by its header, and again before
+/// the RGBA conversion) any whose RGBA would exceed `max` bytes.
+fn decode_raster(bytes: &[u8], max: u64) -> Option<image::RgbaImage> {
+    let reader = image::ImageReader::new(std::io::Cursor::new(bytes)).with_guessed_format().ok()?;
+    if let Ok((w, h)) = reader.into_dimensions()
+        && !fits(w, h, max)
+    {
+        return None;
+    }
     let img = image::load_from_memory(bytes).ok()?;
-    let (w, h) = (img.width(), img.height());
-    if w == 0 || h == 0 || (w as u64) * (h as u64) > 400_000_000 {
+    if !fits(img.width(), img.height(), max) {
         return None;
     }
     Some(img.to_rgba8())
@@ -176,7 +229,7 @@ pub fn dpi(bytes: &[u8]) -> Option<(f64, f64)> {
 /// A premultiplied pixmap of the picture, downsampled so its longer side is near `want` px.
 pub fn decode_for(bytes: &Arc<Vec<u8>>, want: f64, adj: &PictureAdjust) -> Option<Arc<Pixmap>> {
     let addr = Arc::as_ptr(bytes) as usize;
-    if with(|c| c.bad.contains_key(&addr)) {
+    if with(|c| c.is_bad(addr, bytes)) {
         return None;
     }
     // Power-of-two size buckets so zooming doesn't re-decode every frame.
@@ -194,9 +247,7 @@ pub fn decode_for(bytes: &Arc<Vec<u8>>, want: f64, adj: &PictureAdjust) -> Optio
     }
     let target = 1u32 << bucket;
     let Some(mut img) = decode_at(bytes, target) else {
-        with(|c| {
-            c.bad.insert(addr, bytes.clone());
-        });
+        with(|c| c.mark_bad(addr, bytes));
         return None;
     };
     let (w, h) = img.dimensions();
@@ -376,6 +427,66 @@ mod tests {
 
     use super::*;
 
+    fn grey_png(w: u32, h: u32) -> Vec<u8> {
+        let img = image::GrayImage::from_pixel(w, h, image::Luma([90]));
+        let mut out = std::io::Cursor::new(Vec::new());
+        img.write_to(&mut out, image::ImageFormat::Png).expect("encode");
+        out.into_inner()
+    }
+
+    #[test]
+    fn rgba_conversion_is_refused_past_the_cap() {
+        let png = grey_png(100, 50);
+        let rgba = 100 * 50 * 4;
+        assert!(decode_raster(&png, rgba - 1).is_none(), "grey decodes small, its RGBA does not fit");
+        let img = decode_raster(&png, rgba).expect("fits exactly");
+        assert_eq!(img.dimensions(), (100, 50));
+        // A picture whose header claims a huge size is refused.
+        let mut huge = png.clone();
+        huge[16..20].copy_from_slice(&60_000u32.to_be_bytes());
+        huge[20..24].copy_from_slice(&60_000u32.to_be_bytes());
+        assert!(decode_raster(&huge, MAX_RGBA).is_none());
+        assert!(!fits(60_000, 60_000, MAX_RGBA) && fits(8192, 8192, MAX_RGBA));
+    }
+
+    #[test]
+    fn failed_sources_are_bounded_and_released() {
+        let mut c = Cache::default();
+        let srcs: Vec<Arc<Vec<u8>>> = (0..BAD_MAX + 50).map(|i| Arc::new(vec![i as u8; 1000])).collect();
+        for s in &srcs {
+            c.mark_bad(Arc::as_ptr(s) as usize, s);
+        }
+        assert_eq!(c.bad.len(), BAD_MAX);
+        assert_eq!(c.bad_bytes, BAD_MAX * 1000);
+        // The oldest were forgotten and their bytes released; the newest are still known.
+        assert_eq!(Arc::strong_count(&srcs[0]), 1);
+        assert!(!c.is_bad(Arc::as_ptr(&srcs[0]) as usize, &srcs[0]));
+        let last = srcs.last().expect("source");
+        assert!(c.is_bad(Arc::as_ptr(last) as usize, last));
+        // The byte budget holds too, and an input larger than it isn't kept at all.
+        let big = Arc::new(vec![0u8; BAD_BUDGET / 2 + 1]);
+        c.mark_bad(Arc::as_ptr(&big) as usize, &big);
+        let big2 = Arc::new(vec![1u8; BAD_BUDGET / 2 + 1]);
+        c.mark_bad(Arc::as_ptr(&big2) as usize, &big2);
+        assert!(c.bad_bytes <= BAD_BUDGET);
+        assert_eq!(Arc::strong_count(&big), 1);
+        let huge = Arc::new(vec![0u8; BAD_BUDGET + 1]);
+        c.mark_bad(Arc::as_ptr(&huge) as usize, &huge);
+        assert_eq!(Arc::strong_count(&huge), 1);
+    }
+
+    #[test]
+    fn invalid_pictures_fail_and_valid_ones_still_decode_and_cache() {
+        let bad = Arc::new(b"not a picture at all".to_vec());
+        assert!(decode_for(&bad, 64.0, &PictureAdjust::default()).is_none());
+        assert!(decode_for(&bad, 64.0, &PictureAdjust::default()).is_none());
+        let good = Arc::new(grey_png(20, 10));
+        let a = decode_for(&good, 64.0, &PictureAdjust::default()).expect("decodes");
+        let b = decode_for(&good, 64.0, &PictureAdjust::default()).expect("cached");
+        assert!(Arc::ptr_eq(&a, &b));
+        assert_eq!((a.width(), a.height()), (20, 10));
+    }
+
     #[test]
     fn duotone_maps_luminance_between_its_two_colours() {
         use deckcraft_color::Rgba;

From 8bab5c20535b2871b8e568a9f2dde2a0e99fedc2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:53:10 +0300
Subject: [PATCH 128/376] Web: keep a picked file on the document and slide
 that asked for it

The browser file picker only queued a name and bytes. When the read
finished, DeckCraft guessed the command and ran it on whichever
document and slide were active, so a picture, sound or outline could
land in the wrong place, and a later pick could finish first.

The request now keeps the document, the slide or master, the operation
and a cancellation id. A completion applies there, or is dropped when
that target is gone or the picker was dismissed.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                        |   4 +-
 apps/deckcraft-web/src/main.rs    |   3 +-
 apps/deckcraft-web/src/web.rs     |  23 +-
 crates/ui-egui/src/inbox_tests.rs | 188 +++++++++++++++
 crates/ui-egui/src/lib.rs         | 366 ++++++++++++++++++++++++++----
 5 files changed, 537 insertions(+), 47 deletions(-)
 create mode 100644 crates/ui-egui/src/inbox_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..455d0b32 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (progress log: web file picker keeps its document and slide, #414; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Web file picker: a picture, sound, video or outline finishes on the document and slide that asked for it, and is dropped if that presentation was closed or the picker dismissed (#414) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: web file picker keeps its document and slide (#414) |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/apps/deckcraft-web/src/main.rs b/apps/deckcraft-web/src/main.rs
index 366ea346..6d2b7e94 100644
--- a/apps/deckcraft-web/src/main.rs
+++ b/apps/deckcraft-web/src/main.rs
@@ -7,7 +7,8 @@
 //! Differences from the desktop app:
 //! - no TCP control channel (browsers can't listen on sockets);
 //! - File → Open and Insert → Pictures/Audio/Video use the browser file picker; bytes arrive
-//!   asynchronously through `Services::inbox` (presentations open, media is inserted);
+//!   asynchronously through `Services::inbox`, applied to the document, slide and operation
+//!   that started the pick (a dismissed picker or a closed document drops the file);
 //! - Save and Export trigger a browser download;
 //! - dropped files are read asynchronously by `web::WebShell` and delivered through the inbox;
 //! - preferences are not persisted.
diff --git a/apps/deckcraft-web/src/web.rs b/apps/deckcraft-web/src/web.rs
index f0199a55..8fa95918 100644
--- a/apps/deckcraft-web/src/web.rs
+++ b/apps/deckcraft-web/src/web.rs
@@ -1,7 +1,7 @@
 //! The browser shell: web `Services`, drag-and-drop, and the eframe web runner.
 
 use deckcraft_engine::Session;
-use deckcraft_ui_egui::{Inbox, Services, SlideApp};
+use deckcraft_ui_egui::{Inbox, InboxEvent, InboxFile, Services, SlideApp};
 use wasm_bindgen::JsCast as _;
 
 const PRESENTATION_EXTS: &[&str] = &["deckcraft", "pptx", "potx", "ppsx", "txt", "md"];
@@ -77,16 +77,23 @@ impl eframe::App for WebShell {
     fn logic(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         let dropped = ctx.input_mut(|i| std::mem::take(&mut i.raw.dropped_files));
         for f in dropped {
+            // Capture the document and slide now. The bytes arrive later, after the user may
+            // have switched slides.
+            let id = self.app.begin_external_file("drop");
             let inbox = self.inbox.clone();
             let ctx = ctx.clone();
             wasm_bindgen_futures::spawn_local(async move {
                 let name = f.path().file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| "dropped".into());
                 match f.bytes_async().await {
                     Ok(bytes) => {
-                        inbox.lock().unwrap_or_else(|e| e.into_inner()).push((name, bytes));
+                        push_inbox(&inbox, InboxEvent::File(InboxFile { id, name, bytes }));
+                        ctx.request_repaint();
+                    }
+                    Err(e) => {
+                        log::error!("couldn't read dropped file {name}: {e}");
+                        push_inbox(&inbox, InboxEvent::Cancelled { id });
                         ctx.request_repaint();
                     }
-                    Err(e) => log::error!("couldn't read dropped file {name}: {e}"),
                 }
             });
         }
@@ -107,7 +114,7 @@ impl eframe::App for WebShell {
 fn services(inbox: Inbox, ctx: egui::Context) -> Services {
     let open_inbox = inbox.clone();
     Services {
-        open_async: Some(Box::new(move |purpose: &str| {
+        open_async: Some(Box::new(move |purpose: &str, request: u64| {
             let inbox = open_inbox.clone();
             let ctx = ctx.clone();
             let dialog = match purpose {
@@ -118,10 +125,12 @@ fn services(inbox: Inbox, ctx: egui::Context) -> Services {
             };
             wasm_bindgen_futures::spawn_local(async move {
                 let Some(file) = dialog.pick_file().await else {
+                    push_inbox(&inbox, InboxEvent::Cancelled { id: request });
+                    ctx.request_repaint();
                     return;
                 };
                 let bytes = file.read().await;
-                inbox.lock().unwrap_or_else(|e| e.into_inner()).push((file.file_name(), bytes));
+                push_inbox(&inbox, InboxEvent::File(InboxFile { id: request, name: file.file_name(), bytes }));
                 ctx.request_repaint();
             });
         })),
@@ -136,6 +145,10 @@ fn services(inbox: Inbox, ctx: egui::Context) -> Services {
     }
 }
 
+fn push_inbox(inbox: &Inbox, event: InboxEvent) {
+    inbox.lock().unwrap_or_else(|e| e.into_inner()).push(event);
+}
+
 /// Trigger a browser download of `bytes` named after the last component of `path`.
 fn download(path: &str, bytes: &[u8]) -> Result<(), String> {
     let js = |e: wasm_bindgen::JsValue| format!("{e:?}");
diff --git a/crates/ui-egui/src/inbox_tests.rs b/crates/ui-egui/src/inbox_tests.rs
new file mode 100644
index 00000000..dc657173
--- /dev/null
+++ b/crates/ui-egui/src/inbox_tests.rs
@@ -0,0 +1,188 @@
+//! #414: a browser file pick finishes on the document, slide and operation that started it.
+#![allow(clippy::unwrap_used, clippy::expect_used)]
+
+use std::sync::{Arc, Mutex};
+
+use deckcraft_model::ShapeKind;
+use serde_json::json;
+
+use super::{Inbox, InboxEvent, InboxFile, Services, SlideApp};
+use crate::Session;
+
+fn png() -> Vec<u8> {
+    // 1×1 RGB PNG. Enough for `insert.picture` to accept it.
+    const HEX: &str =
+        "89504e470d0a1a0a0000000d4948445200000001000000010802000000907753de0000000c49444154789c63f8cfc0000003010100c9fe92ef0000000049454e44ae426082";
+    (0..HEX.len()).step_by(2).map(|i| u8::from_str_radix(&HEX[i..i + 2], 16).expect("hex")).collect()
+}
+
+fn wav() -> Vec<u8> {
+    let data = [0u8; 8];
+    let mut b = b"RIFF".to_vec();
+    b.extend_from_slice(&(36 + data.len() as u32).to_le_bytes());
+    b.extend_from_slice(b"WAVEfmt ");
+    b.extend_from_slice(&16u32.to_le_bytes());
+    b.extend_from_slice(&1u16.to_le_bytes());
+    b.extend_from_slice(&1u16.to_le_bytes());
+    b.extend_from_slice(&8000u32.to_le_bytes());
+    b.extend_from_slice(&16000u32.to_le_bytes());
+    b.extend_from_slice(&2u16.to_le_bytes());
+    b.extend_from_slice(&16u16.to_le_bytes());
+    b.extend_from_slice(b"data");
+    b.extend_from_slice(&(data.len() as u32).to_le_bytes());
+    b.extend_from_slice(&data);
+    b
+}
+
+fn setup() -> (SlideApp, Inbox, Arc<Mutex<Vec<(String, u64)>>>) {
+    let inbox: Inbox = Inbox::default();
+    let started = Arc::new(Mutex::new(Vec::new()));
+    let record = started.clone();
+    let services = Services {
+        inbox: Some(inbox.clone()),
+        open_async: Some(Box::new(move |purpose, id| {
+            record.lock().expect("request log").push((purpose.to_string(), id));
+        })),
+        ..Default::default()
+    };
+    (SlideApp::new(Session::with_new(), services), inbox, started)
+}
+
+fn deliver(inbox: &Inbox, id: u64, name: &str, bytes: Vec<u8>) {
+    inbox.lock().expect("inbox").push(InboxEvent::File(InboxFile { id, name: name.into(), bytes }));
+}
+
+fn pictures(app: &SlideApp, doc: u64, slide: deckcraft_model::SlideId) -> usize {
+    let st = app.session.documents().iter().find(|d| d.uid == doc).expect("document");
+    let i = st.doc.slide_index(slide).expect("slide");
+    st.doc.slides[i].shapes.iter().filter(|s| matches!(s.kind, ShapeKind::Picture { .. })).count()
+}
+
+fn audios(app: &SlideApp, doc: u64, slide: deckcraft_model::SlideId) -> usize {
+    let st = app.session.documents().iter().find(|d| d.uid == doc).expect("document");
+    let i = st.doc.slide_index(slide).expect("slide");
+    st.doc.slides[i].shapes.iter().filter(|s| matches!(s.kind, ShapeKind::Media(ref m) if !m.video)).count()
+}
+
+/// Two picks finish in reverse order, after the user has changed slide and document.
+/// Each file uses the operation that was requested and lands on the slide that asked.
+#[test]
+fn late_picker_files_keep_their_document_slide_and_operation() {
+    let (mut app, inbox, started) = setup();
+    let uid_a = app.session.active().unwrap().uid;
+    let slide0 = app.session.active().unwrap().current_slide().unwrap().id;
+    app.session.execute("slide.new", &json!({})).unwrap();
+    let slide1 = app.session.active().unwrap().current_slide().unwrap().id;
+    assert_ne!(slide0, slide1);
+
+    // Audio was asked for on slide 1; the picture and the outline on slide 0.
+    app.pick_and_insert("audio", "insert.audio");
+    app.session.execute("slide.go", &json!({"id": slide0.0})).unwrap();
+    app.pick_and_insert("picture", "insert.picture");
+    app.pick_and_open();
+
+    app.session.execute("file.new", &json!({})).unwrap();
+    let uid_b = app.session.active().unwrap().uid;
+    assert_ne!(uid_a, uid_b);
+    let shapes_b = app.session.active().unwrap().doc.slides[0].shapes.len();
+    // A video was requested on B. Delivering a PNG must not insert a picture anywhere.
+    app.pick_and_insert("video", "insert.video");
+
+    let log = started.lock().expect("request log").clone();
+    assert_eq!(log.iter().map(|(p, _)| p.as_str()).collect::<Vec<_>>(), vec!["audio", "picture", "open", "video"]);
+    let audio_id = log[0].1;
+    let picture_id = log[1].1;
+    let outline_id = log[2].1;
+    let video_id = log[3].1;
+
+    // The video request completes first, while B is still current. A PNG must not become a picture.
+    deliver(&inbox, video_id, "clip.mp4", png());
+    app.drain_inbox();
+    let status = app.status.as_ref().map(|(t, _)| t.clone()).unwrap_or_default();
+    assert!(status.contains("not a supported video") || status.contains("no video"), "{status}");
+    assert_eq!(app.session.active().unwrap().doc.slides[0].shapes.len(), shapes_b);
+
+    // The earlier picks then finish in reverse order.
+    deliver(&inbox, outline_id, "talk.md", b"Brought Later\n".to_vec());
+    deliver(&inbox, picture_id, "shot.png", png());
+    deliver(&inbox, audio_id, "tone.wav", wav());
+    app.drain_inbox();
+
+    assert_eq!(app.session.active().unwrap().uid, uid_b, "the view stays on the document the user switched to");
+    assert_eq!(app.session.active().unwrap().doc.slides[0].shapes.len(), shapes_b, "the video request must not insert the PNG here");
+    assert_eq!(pictures(&app, uid_b, app.session.documents().iter().find(|d| d.uid == uid_b).unwrap().doc.slides[0].id), 0);
+
+    let status = app.status.as_ref().map(|(t, _)| t.clone()).unwrap_or_default();
+    assert_eq!(pictures(&app, uid_a, slide0), 1, "{status}");
+    assert_eq!(pictures(&app, uid_a, slide1), 0);
+    assert_eq!(audios(&app, uid_a, slide1), 1);
+    assert_eq!(audios(&app, uid_a, slide0), 0);
+    let a = app.session.documents().iter().find(|d| d.uid == uid_a).unwrap();
+    assert!(a.doc.slides.iter().any(|s| s.title() == "Brought Later"), "the outline stays on the document that opened it");
+    assert_eq!(a.doc.slides.len(), 3);
+    // The user had moved to slide 0 of A before switching documents; B is what's on screen.
+    assert_eq!(app.session.active().unwrap().selection.slide, 0);
+}
+
+/// Closing the presentation, or dismissing the picker, drops the file instead of inserting
+/// it into whatever is open now.
+#[test]
+fn a_closed_or_cancelled_request_does_not_insert_into_the_active_document() {
+    let (mut app, inbox, started) = setup();
+    let slide = app.session.active().unwrap().current_slide().unwrap().id;
+    app.pick_and_insert("picture", "insert.picture");
+    app.session.execute("slide.new", &json!({})).unwrap();
+    let kept = app.session.active().unwrap().current_slide().unwrap().id;
+    app.session.execute("slide.delete", &json!({"ids": [slide.0]})).unwrap();
+    app.pick_and_insert("picture", "insert.picture");
+    let log = started.lock().expect("request log").clone();
+    let deleted_slide = log[0].1;
+    let dismiss = log[1].1;
+
+    inbox.lock().expect("inbox").push(InboxEvent::Cancelled { id: dismiss });
+    deliver(&inbox, dismiss, "late.png", png());
+    deliver(&inbox, deleted_slide, "gone.png", png());
+    // An id that was never started must not insert either.
+    deliver(&inbox, 999, "stray.png", png());
+    app.drain_inbox();
+
+    assert_eq!(pictures(&app, app.session.active().unwrap().uid, kept), 0);
+    let status = app.status.as_ref().map(|(t, _)| t.as_str()).unwrap_or("");
+    assert!(status.contains("deleted"), "{status}");
+
+    app.session.execute("file.close", &json!({})).unwrap();
+    app.session.execute("file.new", &json!({})).unwrap();
+    // The deleted-slide request was already consumed. Start another and close before it arrives.
+    let closed = app.session.active().unwrap().uid;
+    app.pick_and_insert("audio", "insert.audio");
+    let audio_id = started.lock().expect("request log").last().unwrap().1;
+    app.session.execute("file.close", &json!({})).unwrap();
+    app.session.execute("file.new", &json!({})).unwrap();
+    let other = app.session.active().unwrap().uid;
+    assert_ne!(closed, other);
+    deliver(&inbox, audio_id, "tone.wav", wav());
+    app.drain_inbox();
+    let st = app.session.documents().iter().find(|d| d.uid == other).unwrap();
+    let n = st.doc.slides.iter().flat_map(|s| s.shapes.iter()).filter(|s| matches!(s.kind, ShapeKind::Media(_))).count();
+    assert_eq!(n, 0, "a file for a closed presentation is not inserted into the one now open");
+    let status = app.status.as_ref().map(|(t, _)| t.as_str()).unwrap_or("");
+    assert!(status.contains("closed"), "{status}");
+}
+
+/// A drop is bound to the slide under the pointer at drop time, not the slide current when
+/// the bytes have been read.
+#[test]
+fn a_dropped_file_stays_on_the_slide_it_was_dropped_on() {
+    let (mut app, inbox, _) = setup();
+    let uid = app.session.active().unwrap().uid;
+    let slide0 = app.session.active().unwrap().current_slide().unwrap().id;
+    let id = app.begin_external_file("drop");
+    app.session.execute("slide.new", &json!({})).unwrap();
+    let slide1 = app.session.active().unwrap().current_slide().unwrap().id;
+    deliver(&inbox, id, "shot.png", png());
+    app.drain_inbox();
+    assert_eq!(app.session.active().unwrap().current_slide().unwrap().id, slide1, "the view stays on the slide the user moved to");
+    let status = app.status.as_ref().map(|(t, _)| t.clone()).unwrap_or_default();
+    assert_eq!(pictures(&app, uid, slide0), 1, "{status}");
+    assert_eq!(pictures(&app, uid, slide1), 0);
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..409ff68d 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -30,7 +30,8 @@ pub mod widgets;
 
 use std::sync::mpsc::{Receiver, Sender};
 
-use deckcraft_engine::{Mods, Session, UiRequest};
+use deckcraft_engine::{Mods, Session, Target, UiRequest};
+use deckcraft_model::{LayoutId, MasterId, SlideId};
 use serde::{Deserialize, Serialize};
 use serde_json::{Value, json};
 
@@ -39,10 +40,144 @@ pub use control::{ControlRequest, ControlResponse};
 pub type ReadFn = Box<dyn Fn(&str) -> Result<Vec<u8>, String>>;
 pub type WriteFn = Box<dyn FnMut(&str, &[u8]) -> Result<(), String>>;
 pub type PickFn = Box<dyn FnMut(&str) -> Option<String>>;
-pub type OpenAsyncFn = Box<dyn FnMut(&str)>;
+/// `(purpose, request id)`. The host shows a picker and later pushes an [`InboxEvent`]
+/// carrying that same id. Completing a cancelled or unknown id does nothing: the file is
+/// not applied to whichever document happens to be active.
+pub type OpenAsyncFn = Box<dyn FnMut(&str, u64)>;
 pub type DownloadFn = Box<dyn FnMut(&str, &[u8])>;
-/// Files `(name, bytes)` delivered asynchronously by the host (web file picker, dropped files).
-pub type Inbox = std::sync::Arc<std::sync::Mutex<Vec<(String, Vec<u8>)>>>;
+
+/// A file the host finished reading for the request `id` from [`SlideApp::begin_external_file`].
+#[derive(Clone, Debug)]
+pub struct InboxFile {
+    /// Cancellation identity. A file whose id was cancelled, or never started, is ignored.
+    pub id: u64,
+    pub name: String,
+    pub bytes: Vec<u8>,
+}
+
+/// What the host delivers through [`Inbox`] after an asynchronous read.
+#[derive(Clone, Debug)]
+pub enum InboxEvent {
+    File(InboxFile),
+    /// The picker was dismissed or the file could not be read. `id` will not be applied.
+    Cancelled {
+        id: u64,
+    },
+}
+
+/// Files delivered asynchronously by the host (web file picker, dropped files).
+pub type Inbox = std::sync::Arc<std::sync::Mutex<Vec<InboxEvent>>>;
+
+/// The operation the user asked for. Kept with the request so a late completion does not
+/// guess a command from the file name.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum FilePurpose {
+    Open,
+    Picture,
+    Audio,
+    Video,
+    /// A drop, or any other purpose: decide from the name and bytes.
+    Infer,
+}
+
+/// Where in a presentation a file should land. Ids, not indices: slides can move while
+/// the browser is still reading.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum FilePlace {
+    Slide(SlideId),
+    Master(MasterId),
+    Layout {
+        master: MasterId,
+        layout: LayoutId,
+    },
+    /// The document was open but had no current slide, master or layout.
+    Unspecified,
+}
+
+/// The presentation (and place in it) captured when the request started.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum FileTarget {
+    /// Nothing was open. An insert makes its own document rather than using one opened
+    /// while the file was being read.
+    Absent,
+    Document {
+        doc: u64,
+        place: FilePlace,
+    },
+}
+
+struct PendingFile {
+    id: u64,
+    purpose: FilePurpose,
+    target: FileTarget,
+}
+
+struct LocatedPlace {
+    target: Target,
+    slide: Option<usize>,
+}
+
+fn purpose_of(purpose: &str) -> FilePurpose {
+    match purpose {
+        "open" => FilePurpose::Open,
+        "picture" => FilePurpose::Picture,
+        "audio" => FilePurpose::Audio,
+        "video" => FilePurpose::Video,
+        _ => FilePurpose::Infer,
+    }
+}
+
+fn is_presentation_name(lower: &str) -> bool {
+    lower.ends_with(".deckcraft")
+        || lower.ends_with(".slidecraft")
+        || lower.ends_with(".pptx")
+        || lower.ends_with(".potx")
+        || lower.ends_with(".ppsx")
+}
+
+/// File → Open keeps the requested operation: a presentation opens, an outline becomes slides.
+fn open_command(name: &str) -> Option<&'static str> {
+    let lower = name.to_ascii_lowercase();
+    if is_presentation_name(&lower) {
+        Some("file.openBytes")
+    } else if lower.ends_with(".txt") || lower.ends_with(".md") {
+        Some("slide.fromOutline")
+    } else {
+        None
+    }
+}
+
+/// A drop has no requested operation, so the name and bytes decide: a presentation opens,
+/// then a recognised picture, sound or video is inserted, then an outline becomes slides.
+fn infer_command(name: &str, bytes: &[u8]) -> Option<&'static str> {
+    let lower = name.to_ascii_lowercase();
+    if is_presentation_name(&lower) {
+        return Some("file.openBytes");
+    }
+    let ct = deckcraft_engine::cmd::insert::content_type(name, bytes);
+    if ct.starts_with("image/") {
+        Some("insert.picture")
+    } else if ct.starts_with("audio/") {
+        Some("insert.audio")
+    } else if ct.starts_with("video/") {
+        Some("insert.video")
+    } else if lower.ends_with(".txt") || lower.ends_with(".md") {
+        Some("slide.fromOutline")
+    } else {
+        None
+    }
+}
+
+fn command_for(purpose: FilePurpose, name: &str, bytes: &[u8]) -> Result<&'static str, String> {
+    let cmd = match purpose {
+        FilePurpose::Picture => Some("insert.picture"),
+        FilePurpose::Audio => Some("insert.audio"),
+        FilePurpose::Video => Some("insert.video"),
+        FilePurpose::Open => open_command(name),
+        FilePurpose::Infer => infer_command(name, bytes),
+    };
+    cmd.ok_or_else(|| format!("{name}: DeckCraft can't open this kind of file"))
+}
 
 /// Platform services injected by the host (desktop or web).
 #[derive(Default)]
@@ -53,7 +188,8 @@ pub struct Services {
     pub pick_save: Option<PickFn>,
     pub read: Option<ReadFn>,
     pub write: Option<WriteFn>,
-    /// Asynchronous open dialog (web): the chosen file arrives through `inbox`.
+    /// Asynchronous open dialog (web). The callback receives the purpose and the request id
+    /// from [`SlideApp::begin_external_file`]; the chosen file arrives through `inbox`.
     pub open_async: Option<OpenAsyncFn>,
     /// Hand bytes to the user as a named file (browser download).
     pub download: Option<DownloadFn>,
@@ -227,6 +363,10 @@ pub struct SlideApp {
     pub(crate) thumb_drag: Option<(usize, usize)>,
     /// Selection pane: folded groups, renaming, drag and drop.
     pub selpane: selpane::State,
+    /// Next cancellation identity for a browser pick or a dropped file.
+    next_file_id: u64,
+    /// Picks and drops whose bytes have not arrived yet.
+    pending_files: Vec<PendingFile>,
 }
 
 impl SlideApp {
@@ -267,6 +407,8 @@ impl SlideApp {
             ui_fonts: uifonts::UiFonts::default(),
             thumb_drag: None,
             selpane: selpane::State::default(),
+            next_file_id: 1,
+            pending_files: Vec::new(),
         }
     }
 
@@ -566,8 +708,11 @@ impl SlideApp {
             if let Some(path) = pick("open") {
                 let _ = self.open_path(&path);
             }
-        } else if let Some(f) = self.services.open_async.as_mut() {
-            f("open");
+        } else if self.services.open_async.is_some() {
+            let id = self.begin_external_file("open");
+            if let Some(f) = self.services.open_async.as_mut() {
+                f("open", id);
+            }
         }
     }
 
@@ -594,8 +739,11 @@ impl SlideApp {
                     self.set_status(e.to_string());
                 }
             }
-        } else if let Some(f) = self.services.open_async.as_mut() {
-            f(purpose);
+        } else if self.services.open_async.is_some() {
+            let id = self.begin_external_file(purpose);
+            if let Some(f) = self.services.open_async.as_mut() {
+                f(purpose, id);
+            }
         }
     }
 
@@ -678,42 +826,177 @@ impl SlideApp {
 
     fn drain_inbox(&mut self) {
         let Some(inbox) = self.services.inbox.clone() else { return };
-        let files: Vec<(String, Vec<u8>)> = inbox.lock().map(|mut v| std::mem::take(&mut *v)).unwrap_or_default();
-        for (name, bytes) in files {
-            self.open_or_insert_bytes(&name, &bytes);
+        let events = match inbox.lock() {
+            Ok(mut v) => std::mem::take(&mut *v),
+            Err(poisoned) => std::mem::take(&mut *poisoned.into_inner()),
+        };
+        for event in events {
+            match event {
+                InboxEvent::Cancelled { id } => self.pending_files.retain(|r| r.id != id),
+                InboxEvent::File(file) => self.apply_external_file(file.id, &file.name, &file.bytes),
+            }
         }
     }
 
-    /// A dropped or picked file: presentations open, media is inserted.
+    /// Remember the open presentation, the slide (or master/layout) and the operation for a
+    /// file the host will read asynchronously. Returns the cancellation identity the host must
+    /// echo on the [`InboxEvent`]. Call this when the pick or the drop starts, not when the
+    /// bytes arrive.
+    pub fn begin_external_file(&mut self, purpose: &str) -> u64 {
+        let id = self.next_file_id;
+        self.next_file_id = self.next_file_id.wrapping_add(1).max(1);
+        self.pending_files.push(PendingFile { id, purpose: purpose_of(purpose), target: self.capture_file_target() });
+        id
+    }
+
+    /// A dropped or picked file read synchronously: presentations open, media is inserted on
+    /// the slide that is current now.
     pub fn open_or_insert_bytes(&mut self, name: &str, bytes: &[u8]) {
-        let lower = name.to_ascii_lowercase();
-        let data = deckcraft_engine::cmd::base64_encode(bytes);
-        let ct = deckcraft_engine::cmd::insert::content_type(name, bytes);
-        let cmd = if lower.ends_with(".deckcraft")
-            || lower.ends_with(".slidecraft")
-            || lower.ends_with(".pptx")
-            || lower.ends_with(".potx")
-            || lower.ends_with(".ppsx")
-        {
-            "file.openBytes"
-        } else if ct.starts_with("image/") {
-            "insert.picture"
-        } else if ct.starts_with("audio/") {
-            "insert.audio"
-        } else if ct.starts_with("video/") {
-            "insert.video"
-        } else if lower.ends_with(".txt") || lower.ends_with(".md") {
-            "slide.fromOutline"
-        } else {
-            self.set_status(format!("{name}: DeckCraft can't open this kind of file"));
-            return;
+        let id = self.begin_external_file("drop");
+        self.apply_external_file(id, name, bytes);
+    }
+
+    fn capture_file_target(&self) -> FileTarget {
+        let Some(d) = self.session.active() else { return FileTarget::Absent };
+        let place = match d.selection.target {
+            Target::Slides => match d.current_slide() {
+                Some(s) => FilePlace::Slide(s.id),
+                None => FilePlace::Unspecified,
+            },
+            Target::Master { master } => match d.doc.masters.get(master) {
+                Some(m) => FilePlace::Master(m.id),
+                None => FilePlace::Unspecified,
+            },
+            Target::Layout { master, layout } => match d.doc.masters.get(master) {
+                Some(m) => match m.layouts.get(layout) {
+                    Some(l) => FilePlace::Layout { master: m.id, layout: l.id },
+                    None => FilePlace::Unspecified,
+                },
+                None => FilePlace::Unspecified,
+            },
         };
-        let p = if cmd == "slide.fromOutline" { json!({"text": String::from_utf8_lossy(bytes)}) } else { json!({"name": name, "data": data}) };
-        if self.session.active().is_none() && cmd != "file.openBytes" {
-            let _ = self.session.execute("file.new", &json!({}));
+        FileTarget::Document { doc: d.uid, place }
+    }
+
+    /// True when the user is still looking at the place this request captured.
+    fn viewing_target(&self, target: &FileTarget) -> bool {
+        let FileTarget::Document { doc, place } = target else { return false };
+        let Some(d) = self.session.active() else { return false };
+        if d.uid != *doc {
+            return false;
         }
-        if let Err(e) = self.session.execute(cmd, &p) {
-            self.set_status(e.to_string());
+        match place {
+            FilePlace::Slide(id) => d.selection.target == Target::Slides && d.current_slide().is_some_and(|s| s.id == *id),
+            FilePlace::Master(id) => {
+                matches!(d.selection.target, Target::Master { master } if d.doc.masters.get(master).is_some_and(|m| m.id == *id))
+            }
+            FilePlace::Layout { master, layout } => {
+                matches!(d.selection.target, Target::Layout { master: mi, layout: li }
+                    if d.doc.masters.get(mi).is_some_and(|m| m.id == *master && m.layouts.get(li).is_some_and(|l| l.id == *layout)))
+            }
+            FilePlace::Unspecified => false,
+        }
+    }
+
+    fn apply_external_file(&mut self, id: u64, name: &str, bytes: &[u8]) {
+        let Some(pos) = self.pending_files.iter().position(|r| r.id == id) else { return };
+        let req = self.pending_files.remove(pos);
+        let cmd = match command_for(req.purpose, name, bytes) {
+            Ok(cmd) => cmd,
+            Err(e) => {
+                self.set_status(e);
+                return;
+            }
+        };
+        let params = if cmd == "slide.fromOutline" {
+            json!({"text": String::from_utf8_lossy(bytes)})
+        } else {
+            json!({"name": name, "data": deckcraft_engine::cmd::base64_encode(bytes)})
+        };
+        let result = if cmd == "file.openBytes" || self.viewing_target(&req.target) {
+            self.session.execute(cmd, &params).map(|_| ()).map_err(|e| e.to_string())
+        } else {
+            self.execute_on_target(&req.target, name, cmd, &params)
+        };
+        if let Err(e) = result {
+            self.set_status(e);
+        }
+        self.drain_requests();
+    }
+
+    /// Run `cmd` on the document and slide captured for the request, then put the view back
+    /// if the user has since moved. A missing document or slide cancels the file.
+    fn execute_on_target(&mut self, target: &FileTarget, name: &str, cmd: &str, params: &Value) -> Result<(), String> {
+        let FileTarget::Document { doc, place } = target else {
+            self.session.execute("file.new", &json!({})).map_err(|e| e.to_string())?;
+            return self.session.execute(cmd, params).map(|_| ()).map_err(|e| e.to_string());
+        };
+        let Some(idx) = self.session.documents().iter().position(|d| d.uid == *doc) else {
+            return Err(format!("{name} was not applied: the presentation it was chosen for is closed"));
+        };
+        let view = self.session.active_index();
+        let saved = self.session.documents().get(idx).map(|d| d.selection.clone());
+        self.session.set_active(idx);
+        let located = match self.locate_place(place) {
+            Ok(located) => located,
+            Err(e) => {
+                self.restore_file_view(view);
+                return Err(format!("{name} was not applied: {e}"));
+            }
+        };
+        if let Some(st) = self.session.active_mut() {
+            st.selection.target = located.target;
+            if let Some(slide) = located.slide {
+                st.selection.slide = slide;
+                st.selection.slides.clear();
+            }
+            st.selection.shapes.clear();
+            st.selection.text = None;
+            st.selection.cells = None;
+        }
+        let result = self.session.execute(cmd, params).map(|_| ()).map_err(|e| e.to_string());
+        if view == Some(idx) {
+            if let (Some(sel), Some(st)) = (saved, self.session.active_mut()) {
+                st.selection = sel;
+            }
+        } else {
+            self.restore_file_view(view);
+        }
+        result
+    }
+
+    fn restore_file_view(&mut self, view: Option<usize>) {
+        if let Some(i) = view
+            && i < self.session.documents().len()
+        {
+            self.session.set_active(i);
+        }
+    }
+
+    fn locate_place(&self, place: &FilePlace) -> Result<LocatedPlace, String> {
+        let d = self.session.doc().map_err(|e| e.to_string())?;
+        match place {
+            FilePlace::Slide(id) => {
+                let slide = d.doc.slide_index(*id).ok_or_else(|| "the slide it was chosen for was deleted".to_string())?;
+                Ok(LocatedPlace { target: Target::Slides, slide: Some(slide) })
+            }
+            FilePlace::Master(id) => {
+                let master =
+                    d.doc.masters.iter().position(|m| m.id == *id).ok_or_else(|| "the slide master it was chosen for was deleted".to_string())?;
+                Ok(LocatedPlace { target: Target::Master { master }, slide: None })
+            }
+            FilePlace::Layout { master, layout } => {
+                let mi =
+                    d.doc.masters.iter().position(|m| m.id == *master).ok_or_else(|| "the slide master it was chosen for was deleted".to_string())?;
+                let li = d
+                    .doc
+                    .masters
+                    .get(mi)
+                    .and_then(|m| m.layouts.iter().position(|l| l.id == *layout))
+                    .ok_or_else(|| "the layout it was chosen for was deleted".to_string())?;
+                Ok(LocatedPlace { target: Target::Layout { master: mi, layout: li }, slide: None })
+            }
+            FilePlace::Unspecified => Err("there was no slide to put it on".into()),
         }
     }
 
@@ -770,7 +1053,7 @@ impl SlideApp {
             }
         }
         // On the web, dropped files can only be read asynchronously: the host reads them and
-        // delivers them through `Services::inbox`.
+        // delivers them through `Services::inbox`, tagged with the request captured at the drop.
         #[cfg(not(target_arch = "wasm32"))]
         for f in ctx.input(|i| i.raw.dropped_files.clone()) {
             let name = f.path().file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| "dropped file".into());
@@ -1130,6 +1413,9 @@ fn js_now() -> f64 {
 #[cfg(test)]
 mod ime_tests;
 
+#[cfg(test)]
+mod inbox_tests;
+
 #[cfg(test)]
 mod tests {
     #![allow(clippy::unwrap_used, clippy::expect_used)]

From d2066a1f0779d6c4a15c2c67300839f33bdbbef4 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:53:49 +0300
Subject: [PATCH 129/376] Pptx: budget chart points, chart XML size, inflate
 work and VML lookups (#401)

- Charts: every category/value/size cache draws from one chart-wide
  budget of 1M decoded slots, so sparse ptCount/idx declarations across
  many series can't expand far beyond the XML.
- Chart parts go through the same 96 MiB XML size guard as other XML.
- Package::open charges every inflated byte, including parts it then
  discards, against a 4 GiB decompression budget and stops reading
  entries once it is spent.
- Legacy OLE previews index each VML drawing once (shape id -> picture
  part) instead of reparsing it and its rels for every object.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/pptx/src/opc.rs         | 63 +++++++++++++++++++++++++--
 crates/pptx/src/read/chart.rs  | 78 +++++++++++++++++++++++++++-------
 crates/pptx/src/read/mod.rs    |  3 ++
 crates/pptx/src/read/shapes.rs | 36 +++++++++++++---
 crates/pptx/tests/ole_vml.rs   | 36 +++++++++++++++-
 5 files changed, 190 insertions(+), 26 deletions(-)

diff --git a/crates/pptx/src/opc.rs b/crates/pptx/src/opc.rs
index 4ef21c3d..1c246181 100644
--- a/crates/pptx/src/opc.rs
+++ b/crates/pptx/src/opc.rs
@@ -12,6 +12,9 @@ pub const MAX_PART: u64 = 512 * 1024 * 1024;
 pub const MAX_XML_PART: usize = 96 * 1024 * 1024;
 /// Total decompressed bytes accepted for one package.
 pub const MAX_TOTAL: u64 = 2 * 1024 * 1024 * 1024;
+/// Total bytes we are willing to decompress for one package, counting parts we then discard
+/// (too large, or failing part-way): bounds inflate work, not just what is kept.
+pub const MAX_INFLATE_WORK: u64 = 2 * MAX_TOTAL;
 /// Maximum number of zip entries.
 pub const MAX_ENTRIES: usize = 50_000;
 
@@ -36,13 +39,22 @@ pub struct Package {
 
 impl Package {
     pub fn open(bytes: &[u8]) -> Result<Self, PptxError> {
+        Self::open_within(bytes, MAX_PART, MAX_TOTAL, MAX_INFLATE_WORK)
+    }
+    /// [`Package::open`] with explicit limits: per part, kept in total, and inflated in total.
+    fn open_within(bytes: &[u8], max_part: u64, max_total: u64, max_work: u64) -> Result<Self, PptxError> {
         let mut zip = zip::ZipArchive::new(Cursor::new(bytes)).map_err(|e| PptxError::NotPptx(format!("{e}")))?;
         if zip.len() > MAX_ENTRIES {
             return Err(PptxError::NotPptx(format!("too many entries ({})", zip.len())));
         }
         let mut parts = HashMap::new();
         let mut total: u64 = 0;
+        let mut work: u64 = 0;
         for i in 0..zip.len() {
+            if work >= max_work {
+                log::warn!("pptx: decompression budget spent; skipping the remaining {} entries", zip.len() - i);
+                break;
+            }
             let mut f = match zip.by_index(i) {
                 Ok(f) => f,
                 Err(e) => {
@@ -55,13 +67,16 @@ impl Package {
             }
             let name = f.name().trim_start_matches('/').to_string();
             let declared = f.size();
-            if declared > MAX_PART {
+            if declared > max_part {
                 log::warn!("pptx: skipping oversized part {name} ({declared} bytes)");
                 continue;
             }
             let mut data = Vec::with_capacity(declared.min(16 * 1024 * 1024) as usize);
-            let cap = MAX_PART.min(MAX_TOTAL.saturating_sub(total));
-            match (&mut f).take(cap.saturating_add(1)).read_to_end(&mut data) {
+            let cap = max_part.min(max_total.saturating_sub(total)).min(max_work.saturating_sub(work));
+            let read = (&mut f).take(cap.saturating_add(1)).read_to_end(&mut data);
+            // Charge what was inflated whether or not the part is kept.
+            work = work.saturating_add(data.len() as u64);
+            match read {
                 Ok(_) if data.len() as u64 > cap => {
                     log::warn!("pptx: part {name} exceeds size limits; skipped");
                     continue;
@@ -80,6 +95,15 @@ impl Package {
     pub fn get(&self, name: &str) -> Option<&[u8]> {
         self.parts.get(&norm(name)).map(|(_, d)| d.as_slice())
     }
+    /// An XML part's bytes, when it is within the XML size limit.
+    pub fn xml_bytes(&self, name: &str) -> Option<&[u8]> {
+        let b = self.get(name)?;
+        if b.len() > MAX_XML_PART {
+            log::warn!("pptx: XML part {name} too large");
+            return None;
+        }
+        Some(b)
+    }
     /// Parse an XML part.
     pub fn xml(&self, name: &str) -> Option<xml::Doc> {
         let b = self.get(name)?;
@@ -352,6 +376,39 @@ impl PackageOut {
 mod tests {
     use super::*;
 
+    fn zip_of(entries: &[(&str, usize)]) -> Vec<u8> {
+        let mut zw = zip::ZipWriter::new(Cursor::new(Vec::new()));
+        let o = zip::write::SimpleFileOptions::default().compression_method(zip::CompressionMethod::Deflated);
+        for (name, len) in entries {
+            zw.start_file(*name, o).unwrap();
+            zw.write_all(&vec![b'x'; *len]).unwrap();
+        }
+        zw.finish().unwrap().into_inner()
+    }
+
+    #[test]
+    fn discarded_parts_count_against_the_inflate_budget() {
+        // Kept bytes cap at 100: b, c and d are inflated past what's left and discarded. That
+        // work is charged, so after d the budget (130) is spent and e is not read, although it
+        // would have fit.
+        let z = zip_of(&[("a", 80), ("b", 80), ("c", 80), ("d", 80), ("e", 5)]);
+        let p = Package::open_within(&z, 1000, 100, 130).unwrap();
+        assert!(p.get("a").is_some());
+        assert!(p.get("b").is_none() && p.get("d").is_none());
+        assert!(p.get("e").is_none(), "the inflate budget stops reading");
+        // With room to spare the same small part is kept.
+        let p = Package::open_within(&z, 1000, 100, 10_000).unwrap();
+        assert!(p.get("e").is_some());
+    }
+
+    #[test]
+    fn xml_bytes_applies_the_xml_limit() {
+        let z = zip_of(&[("small.xml", 10)]);
+        let p = Package::open(&z).unwrap();
+        assert_eq!(p.xml_bytes("small.xml").map(<[u8]>::len), Some(10));
+        assert!(p.xml_bytes("missing.xml").is_none());
+    }
+
     #[test]
     fn path_resolution() {
         assert_eq!(resolve("ppt/slides", "../media/image1.png"), "ppt/media/image1.png");
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 6d7541ff..ae68f3e9 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -35,19 +35,34 @@ fn rich_text(t: &El) -> Option<String> {
     tx.find("v").map(|v| v.text())
 }
 
-/// String values from `c:cat`/`c:tx` (str or num refs, caches or literals).
-fn strings(e: &El) -> Vec<String> {
+/// Most category/value/size slots one chart may decode across all its series and caches, so
+/// sparse `ptCount`/`idx` declarations can't expand far beyond the XML they came from.
+pub(crate) const MAX_CHART_POINTS: usize = 1_000_000;
+
+/// Most slots one cache may hold.
+const MAX_CACHE_POINTS: usize = 100_000;
+
+/// String values from `c:cat`/`c:tx` (str or num refs, caches or literals). Every slot returned
+/// is taken from `budget`; once it runs out the values are cut short.
+fn strings(e: &El, budget: &mut usize) -> Vec<String> {
+    let cap = MAX_CACHE_POINTS.min(*budget);
+    let out = strings_capped(e, cap);
+    *budget = budget.saturating_sub(out.len());
+    out
+}
+
+fn strings_capped(e: &El, cap: usize) -> Vec<String> {
     let cache = e.find("strCache").or_else(|| e.find("numCache")).or_else(|| e.find("strLit")).or_else(|| e.find("numLit"));
     if let Some(c) = cache {
-        let n = c.child("ptCount").and_then(|p| p.u32("val")).unwrap_or(0).min(100_000) as usize;
+        let n = (c.child("ptCount").and_then(|p| p.u32("val")).unwrap_or(0) as usize).min(cap);
         let mut out = vec![String::new(); n];
-        for pt in c.children_named("pt").take(100_000) {
+        for pt in c.children_named("pt").take(MAX_CACHE_POINTS) {
             let i = pt.u32("idx").unwrap_or(0) as usize;
+            if i >= cap {
+                continue;
+            }
             let v = pt.child("v").map(|v| v.text()).unwrap_or_default();
             if i >= out.len() {
-                if i >= 100_000 {
-                    continue;
-                }
                 out.resize(i + 1, String::new());
             }
             if let Some(s) = out.get_mut(i) {
@@ -59,17 +74,19 @@ fn strings(e: &El) -> Vec<String> {
     if let Some(ml) = e.find("multiLvlStrCache") {
         // Use the innermost level.
         if let Some(l) = ml.child("lvl") {
-            return l.children_named("pt").map(|p| p.child("v").map(|v| v.text()).unwrap_or_default()).collect();
+            return l.children_named("pt").take(cap).map(|p| p.child("v").map(|v| v.text()).unwrap_or_default()).collect();
         }
     }
-    if let Some(v) = e.child("v") {
+    if cap > 0
+        && let Some(v) = e.child("v")
+    {
         return vec![v.text()];
     }
     vec![]
 }
 
-fn numbers(e: &El) -> Vec<Option<f64>> {
-    strings(e).into_iter().map(|s| s.trim().parse::<f64>().ok().filter(|v| v.is_finite())).collect()
+fn numbers(e: &El, budget: &mut usize) -> Vec<Option<f64>> {
+    strings(e, budget).into_iter().map(|s| s.trim().parse::<f64>().ok().filter(|v| v.is_finite())).collect()
 }
 
 /// Parse a chart part. Returns `None` for something that isn't a chart we can read.
@@ -86,6 +103,11 @@ pub fn read_chart_xml(bytes: &[u8]) -> Option<Chart> {
 }
 
 pub(crate) fn chart_from(root: &El) -> Option<Chart> {
+    chart_within(root, MAX_CHART_POINTS)
+}
+
+/// [`chart_from`] decoding at most `budget` data slots in all.
+fn chart_within(root: &El, mut budget: usize) -> Option<Chart> {
     let ch = root.child("chart")?;
     let pa = ch.child("plotArea")?;
     let mut c = Chart { categories: vec![], series: vec![], title: None, legend: None, gridlines: false, ..Default::default() };
@@ -190,7 +212,7 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
         let secondary = val_axis.is_some() && val_axis != primary_val;
         for s in g.children_named("ser").take(1000) {
             let mut ser = Series {
-                name: s.child("tx").map(strings).and_then(|v| v.into_iter().next()).unwrap_or_default(),
+                name: s.child("tx").map(|t| strings(t, &mut budget)).and_then(|v| v.into_iter().next()).unwrap_or_default(),
                 fill: simple_fill(s.child("spPr")),
                 line: simple_line(s.child("spPr")),
                 smooth: s.child("smooth").and_then(|v| v.bool("val")).unwrap_or(false),
@@ -218,7 +240,7 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
                 }
             }
             if let Some(cat) = s.child("cat").or_else(|| s.child("xVal")) {
-                let cats = strings(cat);
+                let cats = strings(cat, &mut budget);
                 if matches!(kind, ChartType::Scatter | ChartType::Bubble) {
                     ser.x_values = cats.iter().map(|v| v.trim().parse::<f64>().ok()).collect();
                 }
@@ -227,10 +249,10 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
                 }
             }
             if let Some(v) = s.child("val").or_else(|| s.child("yVal")) {
-                ser.values = numbers(v);
+                ser.values = numbers(v, &mut budget);
             }
             if let Some(b) = s.child("bubbleSize") {
-                ser.sizes = numbers(b);
+                ser.sizes = numbers(b, &mut budget);
             }
             c.series.push(ser);
         }
@@ -310,6 +332,32 @@ fn text_size(e: Option<&El>) -> Option<f64> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn sparse_caches_share_one_chart_wide_budget() {
+        // Every series declares 100000 points but writes one: without a chart-wide budget each
+        // would expand to the full count.
+        let ser = |n: usize| {
+            format!(
+                r#"<c:ser><c:idx val="{n}"/><c:val><c:numRef><c:numCache><c:ptCount val="100000"/><c:pt idx="0"><c:v>{n}</c:v></c:pt></c:numCache></c:numRef></c:val></c:ser>"#
+            )
+        };
+        let sers: String = (0..5).map(ser).collect();
+        let xml = format!(
+            r#"<c:chartSpace xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart"><c:chart><c:plotArea><c:barChart><c:barDir val="col"/>{sers}</c:barChart></c:plotArea></c:chart></c:chartSpace>"#
+        );
+        let doc = crate::xml::parse(xml.as_bytes()).unwrap();
+        let c = chart_within(&doc.root, 250_000).unwrap();
+        let total: usize = c.series.iter().map(|s| s.values.len()).sum();
+        assert!(total <= 250_000, "{total}");
+        assert_eq!(c.series.len(), 5);
+        assert_eq!(c.series[0].values.len(), 100_000);
+        assert_eq!(c.series[0].values[0], Some(0.0));
+        assert!(c.series[4].values.is_empty(), "the budget ran out before the last series");
+        // A small chart is untouched by the default budget.
+        let c = chart_from(&doc.root).unwrap();
+        assert!(c.series.iter().all(|s| s.values.len() == 100_000));
+    }
+
     #[test]
     fn legend_position_and_overlay_are_read() {
         let legend = r#"<c:legend><c:legendPos val="r"/><c:overlay val="1"/></c:legend>"#;
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..45c6af52 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -32,6 +32,8 @@ pub struct Imp<'a> {
     pub custom_show_names: HashMap<String, String>,
     /// GUIDs (upper case) of the table styles the file defines.
     pub table_style_ids: Vec<String>,
+    /// Per legacy VML drawing part: shape id → preview picture part (see `shapes::vml_preview`).
+    pub vml_previews: HashMap<String, HashMap<String, String>>,
 }
 
 impl Imp<'_> {
@@ -233,6 +235,7 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
         slide_by_part: HashMap::new(),
         custom_show_names: HashMap::new(),
         table_style_ids: Vec::new(),
+        vml_previews: HashMap::new(),
     };
     // Slide ids first so hyperlinks anywhere can point at slides.
     let mut slide_ids: Vec<(u32, String, SlideId)> = vec![];
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index c4b3f77f..2281cd78 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -367,7 +367,7 @@ fn frame(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El, depth: usize) -> S
         }
         if let Some(c) = gd.child("chart")
             && let Some(rel) = part.rels.get(c.attr("r:id").unwrap_or(""))
-            && let Some(bytes) = imp.pkg.get(&rel.target)
+            && let Some(bytes) = imp.pkg.xml_bytes(&rel.target)
             && let Some(chart) = super::read_chart_xml(bytes)
         {
             s.kind = ShapeKind::Chart(Box::new(chart));
@@ -403,17 +403,39 @@ fn frame(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El, depth: usize) -> S
 /// `v:imagedata` of the legacy VML drawing shape with that id, as PowerPoint 2007 wrote them.
 fn vml_preview(imp: &mut Imp, part: &Part, spid: &str) -> Option<deckcraft_model::MediaId> {
     for rel in part.rels.items.iter().filter(|r| r.kind == "vmlDrawing" && !r.external) {
-        let Some(doc) = imp.pkg.xml(&rel.target) else { continue };
-        let mut shapes = vec![];
-        doc.root.find_all("shape", &mut shapes);
-        let Some(img) = shapes.into_iter().find(|s| s.attr("id") == Some(spid)).and_then(|s| s.find("imagedata")) else { continue };
-        let Some(id) = img.attr("o:relid").or(img.attr("r:id")) else { continue };
-        let target = imp.pkg.rels(&rel.target).get(id).filter(|r| !r.external).map(|r| r.target.clone())?;
+        let key = crate::opc::norm(&rel.target);
+        if !imp.vml_previews.contains_key(&key) {
+            let index = vml_index(imp.pkg, &rel.target);
+            imp.vml_previews.insert(key.clone(), index);
+        }
+        let Some(target) = imp.vml_previews.get(&key).and_then(|m| m.get(spid)).cloned() else { continue };
         return imp.media_for(&target);
     }
     None
 }
 
+/// Every shape id in a VML drawing with a picture, mapped to that picture's part: parsed once per
+/// drawing however many objects look it up.
+fn vml_index(pkg: &crate::opc::Package, vml: &str) -> std::collections::HashMap<String, String> {
+    let mut out = std::collections::HashMap::new();
+    let Some(doc) = pkg.xml(vml) else { return out };
+    let rels = pkg.rels(vml);
+    let mut shapes = vec![];
+    doc.root.find_all("shape", &mut shapes);
+    for s in shapes {
+        let Some(id) = s.attr("id") else { continue };
+        if out.contains_key(id) {
+            continue; // the first shape with an id wins, as the old lookup did
+        }
+        let Some(img) = s.find("imagedata") else { continue };
+        let Some(rid) = img.attr("o:relid").or(img.attr("r:id")) else { continue };
+        if let Some(r) = rels.get(rid).filter(|r| !r.external) {
+            out.insert(id.to_string(), r.target.clone());
+        }
+    }
+    out
+}
+
 /// SmartArt: read the pre-drawn shapes of its drawing part as a group.
 fn smartart(imp: &mut Imp, part: &Part, gd: &El, frame: &Shape, depth: usize) -> Option<Shape> {
     let rel_ids = gd.child("relIds")?;
diff --git a/crates/pptx/tests/ole_vml.rs b/crates/pptx/tests/ole_vml.rs
index 8f6c007b..ccdc803a 100644
--- a/crates/pptx/tests/ole_vml.rs
+++ b/crates/pptx/tests/ole_vml.rs
@@ -27,6 +27,11 @@ fn png(v: u8) -> Vec<u8> {
 
 /// A new deck whose first slide holds [`FRAME`], with the VML drawing, its rels and two pictures.
 fn deck() -> Vec<u8> {
+    deck_with(FRAME)
+}
+
+/// [`deck`] with `frames` in place of [`FRAME`].
+fn deck_with(frames: &str) -> Vec<u8> {
     let bytes = deckcraft_pptx::export(&defaults::new_presentation(None)).expect("export");
     let mut z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
     let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
@@ -39,7 +44,7 @@ fn deck() -> Vec<u8> {
         if name == "ppt/slides/slide1.xml" {
             let s = String::from_utf8(d).expect("utf8");
             let at = s.rfind("</p:spTree>").expect("spTree");
-            let s = format!("{}{FRAME}{}", &s[..at], &s[at..]);
+            let s = format!("{}{frames}{}", &s[..at], &s[at..]);
             let at = s.rfind("</p:cSld>").expect("cSld");
             d = format!("{}{CONTROLS}{}", &s[..at], &s[at..]).into_bytes();
         } else if name == "ppt/slides/_rels/slide1.xml.rels" {
@@ -82,3 +87,32 @@ fn activex_controls_show_their_pictures() {
     assert_eq!((x.x, x.y, x.w, x.h), (1.0, 2.0, 10.0, 5.0));
     assert!(!p.slides[0].shapes.iter().any(|s| s.name == "NoPicture"), "a control without a picture draws nothing");
 }
+
+#[test]
+fn many_objects_sharing_one_vml_drawing_each_get_their_preview() {
+    // 200 frames look up the same drawing (it is parsed once); every other one names a shape id
+    // the drawing doesn't have.
+    let frames: String = (0..200)
+        .map(|i| {
+            let spid = match i % 4 {
+                0 => "_x0000_s2050",
+                1 => "_x0000_s9999",
+                2 => "_x0000_s2049",
+                _ => "missing",
+            };
+            FRAME.replace("id=\"90\" name=\"Object 3\"", &format!("id=\"{}\" name=\"Obj {i}\"", 1000 + i)).replace("_x0000_s2050", spid)
+        })
+        .collect();
+    let p = deckcraft_pptx::import(&deck_with(&frames)).expect("import");
+    for i in 0..200 {
+        let s = p.slides[0].shapes.iter().find(|s| s.name == format!("Obj {i}")).expect("frame");
+        let ShapeKind::Opaque { preview, .. } = &s.kind else { panic!("{:?}", s.kind) };
+        let name = preview.and_then(|m| p.media.iter().find(|x| x.id == m)).map(|m| m.name.as_str());
+        let want = match i % 4 {
+            0 => Some("preview.png"),
+            2 => Some("other.png"),
+            _ => None,
+        };
+        assert_eq!(name, want, "frame {i}");
+    }
+}

From 1fe638bcf83d5e9bbad149ea173de4c1ce92072c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:55:12 +0300
Subject: [PATCH 130/376] AV1: reject duplicate film-grain scaling points; a
 failed job still publishes (#394)

The film-grain header accepted scaling points whose values didn't strictly
increase, and building the scaling lookup then divided by zero. In threaded
decoding the panic left the frame's reference and picture slots unset, so
the output and dependent frames waited forever.

- The header rejects Y/Cb/Cr point values that don't strictly increase
  (spec 6.8.20).
- The scaling lookup moves into scaling_lut, which skips a non-increasing
  pair and uses checked indexing (defence in depth).
- run_job decodes inside guarded (catch_unwind), so a panic becomes an error
  published to the picture and reference slots.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/av1/src/decoder.rs | 39 ++++++++++++++++++++++-
 crates/av1/src/grain.rs   | 67 +++++++++++++++++++++++++++++----------
 crates/av1/src/header.rs  | 23 ++++++++++++++
 3 files changed, 111 insertions(+), 18 deletions(-)

diff --git a/crates/av1/src/decoder.rs b/crates/av1/src/decoder.rs
index 66c96698..e310feb9 100644
--- a/crates/av1/src/decoder.rs
+++ b/crates/av1/src/decoder.rs
@@ -633,7 +633,9 @@ impl Decoder {
 /// Decode a frame job and publish its results.
 fn run_job(job: FrameJob, pool: &Pool, stats: &Mutex<DecodeStats>) {
     let mut st = DecodeStats::default();
-    match decode_frame(&job, pool, &mut st) {
+    // A panic while decoding must still publish an error: the output and every frame that
+    // references this one wait on these slots.
+    match guarded(|| decode_frame(&job, pool, &mut st)) {
         Ok((rf, pic)) => {
             if let Some(ps) = &job.picture {
                 ps.set(pic.map(Arc::new).ok_or(Error::Invalid("shown frame without picture")));
@@ -652,6 +654,12 @@ fn run_job(job: FrameJob, pool: &Pool, stats: &Mutex<DecodeStats>) {
     }
 }
 
+/// Run `f`, turning a panic into an error (the decoder's own code never panics on purpose; this
+/// keeps a bug from stranding the job's waiters).
+fn guarded<R>(f: impl FnOnce() -> Result<R>) -> Result<R> {
+    std::panic::catch_unwind(std::panic::AssertUnwindSafe(f)).unwrap_or(Err(Error::Invalid("frame decode panicked")))
+}
+
 /// The whole decoding process of one frame: setup, tiles, post-filters, motion vector storage
 /// and the output picture.
 fn decode_frame(job: &FrameJob, pool: &Pool, stats: &mut DecodeStats) -> Result<(Arc<RefFrame>, Option<Picture>)> {
@@ -947,3 +955,32 @@ fn project(fs: &mut FrameState, src: usize, dst_sign: i32) -> bool {
     }
     true
 }
+
+#[cfg(test)]
+mod guard_tests {
+    use super::*;
+
+    #[test]
+    fn a_panicking_job_still_publishes_an_error_to_its_waiters() {
+        let slot: Arc<Slot<u32>> = Slot::new();
+        let picture: Arc<Slot<u32>> = Slot::new();
+        // Waiters: the output and a dependent frame, on their own threads.
+        let (tx, rx) = std::sync::mpsc::channel();
+        for s in [slot.clone(), picture.clone()] {
+            let tx = tx.clone();
+            std::thread::spawn(move || {
+                let _ = tx.send(s.wait().is_err());
+            });
+        }
+        let (s, p) = (slot.clone(), picture.clone());
+        std::thread::spawn(move || {
+            let r: Result<u32> = guarded(|| panic!("hostile frame"));
+            p.set(r.clone());
+            s.set(r);
+        });
+        for _ in 0..2 {
+            assert_eq!(rx.recv_timeout(std::time::Duration::from_secs(10)), Ok(true));
+        }
+        assert_eq!(guarded(|| Ok(5)).ok(), Some(5));
+    }
+}
diff --git a/crates/av1/src/grain.rs b/crates/av1/src/grain.rs
index d4baad62..4222c672 100644
--- a/crates/av1/src/grain.rs
+++ b/crates/av1/src/grain.rs
@@ -5,6 +5,39 @@ use crate::header::{FilmGrainParams, SequenceHeader};
 use crate::spec_tables::{GAUSSIAN_SEQUENCE, MC_IDENTITY};
 
 #[inline]
+/// One plane's scaling lookup (7.18.3.4) from its `n` points. The header rejects points whose
+/// values don't strictly increase; a pair that still doesn't (defence in depth) is skipped
+/// instead of dividing by zero. No points: all zero.
+fn scaling_lut(n: usize, xs: &[u8], ys: &[u8]) -> [i32; 256] {
+    let mut l = [0i32; 256];
+    let n = n.min(xs.len()).min(ys.len());
+    let (Some(&x0), Some(&y0)) = (xs.first(), ys.first()) else { return l };
+    if n == 0 {
+        return l;
+    }
+    for v in l.iter_mut().take(x0 as usize) {
+        *v = y0 as i32;
+    }
+    for i in 0..n - 1 {
+        let (xa, xb, ya, yb) = (xs[i] as i32, xs[i + 1] as i32, ys[i] as i32, ys[i + 1] as i32);
+        let dx = xb - xa;
+        if dx <= 0 {
+            continue;
+        }
+        let delta = (yb - ya) * ((65536 + (dx >> 1)) / dx);
+        for x in 0..dx {
+            if let Some(v) = l.get_mut((xa + x) as usize) {
+                *v = ya + ((x * delta + 32768) >> 16);
+            }
+        }
+    }
+    let (xl, yl) = (xs[n - 1], ys[n - 1]);
+    for v in l.iter_mut().skip(xl as usize) {
+        *v = yl as i32;
+    }
+    l
+}
+
 fn round2(x: i32, n: u32) -> i32 {
     if n == 0 { x } else { (x + (1 << (n - 1))) >> n }
 }
@@ -124,23 +157,7 @@ pub(crate) fn apply(pic: &mut Picture, g: &FilmGrainParams, seq: &SequenceHeader
         } else {
             (g.num_cr_points, &g.point_cr_value, &g.point_cr_scaling)
         };
-        if n == 0 {
-            continue;
-        }
-        for v in l.iter_mut().take(xs[0] as usize) {
-            *v = ys[0] as i32;
-        }
-        for i in 0..n - 1 {
-            let dy = ys[i + 1] as i32 - ys[i] as i32;
-            let dx = xs[i + 1] as i32 - xs[i] as i32;
-            let delta = dy * ((65536 + (dx >> 1)) / dx);
-            for x in 0..dx {
-                l[xs[i] as usize + x as usize] = ys[i] as i32 + ((x * delta + 32768) >> 16);
-            }
-        }
-        for v in l.iter_mut().skip(xs[n - 1] as usize) {
-            *v = ys[n - 1] as i32;
-        }
+        *l = scaling_lut(n, xs, ys);
     }
     let scale_lut = |plane: usize, index: i32| -> i32 {
         let sh = bd - 8;
@@ -274,3 +291,19 @@ pub(crate) fn apply(pic: &mut Picture, g: &FilmGrainParams, seq: &SequenceHeader
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn scaling_lut_interpolates_and_tolerates_duplicate_points() {
+        let l = scaling_lut(2, &[0, 255], &[0, 255]);
+        assert_eq!((l[0], l[128], l[255]), (0, 128, 255));
+        // Duplicate and descending x values don't divide by zero.
+        let l = scaling_lut(4, &[10, 10, 5, 200], &[20, 40, 60, 80]);
+        assert_eq!(l[0], 20);
+        assert_eq!(l[255], 80);
+        assert_eq!(scaling_lut(0, &[], &[]), [0; 256]);
+    }
+}
diff --git a/crates/av1/src/header.rs b/crates/av1/src/header.rs
index fa9db0a6..16cccd9e 100644
--- a/crates/av1/src/header.rs
+++ b/crates/av1/src/header.rs
@@ -1256,6 +1256,7 @@ impl FrameHeader {
             g.point_y_value[i] = r.f(8)? as u8;
             g.point_y_scaling[i] = r.f(8)? as u8;
         }
+        check_increasing(&g.point_y_value[..g.num_y_points], "point_y_value")?;
         g.chroma_scaling_from_luma = if seq.color.mono_chrome { false } else { r.flag()? };
         if seq.color.mono_chrome
             || g.chroma_scaling_from_luma
@@ -1272,6 +1273,7 @@ impl FrameHeader {
                 g.point_cb_value[i] = r.f(8)? as u8;
                 g.point_cb_scaling[i] = r.f(8)? as u8;
             }
+            check_increasing(&g.point_cb_value[..g.num_cb_points], "point_cb_value")?;
             g.num_cr_points = r.f(4)? as usize;
             if g.num_cr_points > 10 {
                 return Err(Error::Invalid("num_cr_points"));
@@ -1280,6 +1282,7 @@ impl FrameHeader {
                 g.point_cr_value[i] = r.f(8)? as u8;
                 g.point_cr_scaling[i] = r.f(8)? as u8;
             }
+            check_increasing(&g.point_cr_value[..g.num_cr_points], "point_cr_value")?;
         }
         g.grain_scaling_minus_8 = r.f(2)?;
         g.ar_coeff_lag = r.f(2)?;
@@ -1367,3 +1370,23 @@ fn decode_subexp(r: &mut BitReader, num_syms: i32) -> Result<i32> {
         }
     }
 }
+
+/// Film-grain scaling point values must strictly increase (AV1 spec 6.8.20); a duplicate would
+/// divide by zero when the scaling lookup is built.
+fn check_increasing(values: &[u8], what: &'static str) -> Result<()> {
+    if values.windows(2).all(|w| w[0] < w[1]) { Ok(()) } else { Err(Error::Invalid(what)) }
+}
+
+#[cfg(test)]
+mod grain_point_tests {
+    use super::*;
+
+    #[test]
+    fn scaling_points_must_strictly_increase() {
+        assert!(check_increasing(&[], "p").is_ok());
+        assert!(check_increasing(&[7], "p").is_ok());
+        assert!(check_increasing(&[0, 10, 255], "p").is_ok());
+        assert!(matches!(check_increasing(&[0, 10, 10], "point_y_value"), Err(Error::Invalid("point_y_value"))));
+        assert!(check_increasing(&[20, 10], "p").is_err());
+    }
+}

From 241ecd59d71e6cb105be33cfea5779fb08b96b05 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:56:21 +0300
Subject: [PATCH 131/376] Recovery: unique uids, per-instance ownership, keep
 snapshots until replaced (#390)

Document uids started at 1 in every process, so two instances sharing
the recovery folder overwrote and deleted each other's entries, and
file.recovery.open deleted each entry as soon as it was loaded, leaving
nothing if the app died before the next checkpoint.

- Uids are a random per-process base plus a counter (below 2^53).
- Each instance holds a lock on owner-<id>.lock in the folder; entries
  record their owner, and recovery open skips a running owner's entries
  and removes stale lock files.
- Opening an entry no longer deletes it: the recovered presentation keeps
  the entry's uid and takes ownership, so the snapshot stays until the
  next recovery save replaces it or a save/close removes it.
- Entry files and metadata are both written via temp file + rename.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/lib.rs      |  11 +-
 crates/engine/src/recovery.rs | 183 ++++++++++++++++++++++++++++++----
 2 files changed, 175 insertions(+), 19 deletions(-)

diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..c06da208 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -175,7 +175,14 @@ pub struct DocState {
     pub composition: Option<Composition>,
 }
 
-static NEXT_UID: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(1);
+static NEXT_UID: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);
+
+/// A document id unique across processes, not just within this one: recovery entries are named
+/// by it in a folder every running instance shares. Ids are this process's random base (see
+/// [`recovery::instance_id`]) plus a counter.
+fn next_uid() -> u64 {
+    recovery::instance_id().wrapping_add(NEXT_UID.fetch_add(1, std::sync::atomic::Ordering::Relaxed)) & recovery::UID_MASK
+}
 
 impl DocState {
     pub fn new(doc: Presentation, path: Option<String>, title: String) -> Self {
@@ -188,7 +195,7 @@ impl DocState {
             path,
             revision: 1,
             interaction: None,
-            uid: NEXT_UID.fetch_add(1, std::sync::atomic::Ordering::Relaxed),
+            uid: next_uid(),
             title,
             missing_fonts: Vec::new(),
             composition: None,
diff --git a/crates/engine/src/recovery.rs b/crates/engine/src/recovery.rs
index 30daa81e..7bcc98c9 100644
--- a/crates/engine/src/recovery.rs
+++ b/crates/engine/src/recovery.rs
@@ -5,9 +5,18 @@
 //! they were saved.
 //!
 //! An entry is `<uid>.deckcraft` (the presentation) plus `<uid>.json` (`{"path", "title",
-//! "saved"}`: the original file, the title and when it was written, Unix seconds).
+//! "saved", "owner"}`: the original file, the title, when it was written (Unix seconds) and the
+//! instance that owns it).
+//!
+//! Several instances share the folder. Document uids are unique across processes, each instance
+//! holds a lock on `owner-<instance>.lock` while it runs, and `file.recovery.open` leaves alone
+//! the entries of an instance whose lock is still held. Opening an entry doesn't delete it: the
+//! recovered presentation keeps the entry's uid, so the snapshot stays on disk until the next
+//! recovery save replaces it or a save of the presentation removes it.
 
+use std::fs::File;
 use std::path::{Path, PathBuf};
+use std::sync::{Mutex, OnceLock};
 
 use serde_json::{Value, json};
 
@@ -25,6 +34,56 @@ pub fn default_dir() -> Option<PathBuf> {
     std::env::var_os("XDG_DATA_HOME").map(PathBuf::from).or_else(|| home.map(|h| h.join(".local/share"))).map(|d| d.join("deckcraft/recovery"))
 }
 
+/// Uids and instance ids stay below 2^53 so they survive JSON numbers read as `f64`.
+pub(crate) const UID_MASK: u64 = (1 << 53) - 1;
+
+/// This process's random id, with the low 24 bits clear so its document uids (id + counter) don't
+/// run into another instance's.
+pub fn instance_id() -> u64 {
+    static ID: OnceLock<u64> = OnceLock::new();
+    *ID.get_or_init(|| {
+        use std::hash::{BuildHasher, Hasher};
+        let mut h = std::collections::hash_map::RandomState::new().build_hasher();
+        h.write_u32(std::process::id());
+        #[cfg(not(target_arch = "wasm32"))]
+        if let Ok(d) = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH) {
+            h.write_u128(d.as_nanos());
+        }
+        // Never 0: old entries are numbered from 1.
+        ((h.finish() & UID_MASK) & !0xFF_FFFF).max(1 << 24)
+    })
+}
+
+fn lock_path(dir: &Path, owner: u64) -> PathBuf {
+    dir.join(format!("owner-{owner}.lock"))
+}
+
+/// Hold this instance's lock in `dir` for the rest of the process (once per folder).
+fn claim_dir(dir: &Path) {
+    static HELD: Mutex<Vec<(PathBuf, File)>> = Mutex::new(Vec::new());
+    let Ok(mut held) = HELD.lock() else { return };
+    if held.iter().any(|(d, _)| d == dir) {
+        return;
+    }
+    let path = lock_path(dir, instance_id());
+    match File::create(&path).and_then(|f| f.try_lock().map(|()| f).map_err(std::io::Error::other)) {
+        Ok(f) => held.push((dir.to_path_buf(), f)),
+        Err(e) => log::warn!("recovery: could not lock {}: {e}", path.display()),
+    }
+}
+
+/// Whether another running instance holds `owner`'s lock in `dir`.
+fn owner_alive(dir: &Path, owner: u64) -> bool {
+    let Ok(f) = File::open(lock_path(dir, owner)) else { return false };
+    matches!(f.try_lock(), Err(std::fs::TryLockError::WouldBlock))
+}
+
+/// Write `bytes` to `path` through a temporary file and a rename, so a crash never leaves it torn.
+fn write_atomic(path: &Path, bytes: &[u8]) -> Result<()> {
+    let tmp = path.with_extension(format!("{}.tmp", path.extension().and_then(|e| e.to_str()).unwrap_or("")));
+    std::fs::write(&tmp, bytes).and_then(|_| std::fs::rename(&tmp, path)).map_err(|e| EngineError::Other(format!("{}: {e}", path.display())))
+}
+
 fn files(dir: &Path, uid: u64) -> (PathBuf, PathBuf) {
     (dir.join(format!("{uid}.deckcraft")), dir.join(format!("{uid}.json")))
 }
@@ -51,6 +110,7 @@ pub fn discard(dir: &Path, uid: u64) {
 /// were written.
 pub fn save(s: &Session, dir: &Path) -> Result<usize> {
     std::fs::create_dir_all(dir).map_err(|e| EngineError::Other(format!("{}: {e}", dir.display())))?;
+    claim_dir(dir);
     let mut n = 0;
     for d in s.documents() {
         if !d.is_dirty() {
@@ -59,11 +119,9 @@ pub fn save(s: &Session, dir: &Path) -> Result<usize> {
         }
         let (doc, meta) = files(dir, d.uid);
         let bytes = deckcraft_format::save(&d.doc).map_err(|e| EngineError::Other(e.to_string()))?;
-        // Write then rename, so a crash mid-write never leaves a torn file.
-        let tmp = doc.with_extension("tmp");
-        std::fs::write(&tmp, &bytes).and_then(|_| std::fs::rename(&tmp, &doc)).map_err(|e| EngineError::Other(format!("{}: {e}", doc.display())))?;
-        let m = json!({"path": d.path, "title": d.title(), "saved": now_secs()});
-        std::fs::write(&meta, m.to_string()).map_err(|e| EngineError::Other(format!("{}: {e}", meta.display())))?;
+        write_atomic(&doc, &bytes)?;
+        let m = json!({"path": d.path, "title": d.title(), "saved": now_secs(), "owner": instance_id()});
+        write_atomic(&meta, m.to_string().as_bytes())?;
         n += 1;
     }
     Ok(n)
@@ -91,27 +149,67 @@ pub fn list(dir: &Path) -> Vec<(u64, Value)> {
     out
 }
 
-/// Reopen every entry as an unsaved presentation and remove the entries (this session writes its
-/// own). Unreadable entries are left in place. Returns the opened documents' indices.
+/// Reopen every entry left by an instance that is no longer running as an unsaved presentation.
+/// Entries stay on disk, now owned by this instance: the presentation keeps the entry's uid, so
+/// the next recovery save replaces the snapshot and saving or closing it removes it. Entries of a
+/// running instance, unreadable entries and entries already open here are left alone. Returns the
+/// opened documents' indices.
 pub fn open(s: &mut Session, dir: &Path) -> Result<Vec<usize>> {
+    let me = instance_id();
     let mut opened = Vec::new();
-    for (uid, meta) in list(dir) {
-        let (doc, _) = files(dir, uid);
+    for (uid, mut meta) in list(dir) {
+        if s.documents().iter().any(|d| d.uid == uid) {
+            continue;
+        }
+        if let Some(owner) = meta.get("owner").and_then(Value::as_u64)
+            && owner != me
+            && owner_alive(dir, owner)
+        {
+            continue;
+        }
+        let (doc, meta_path) = files(dir, uid);
         let Ok(bytes) = std::fs::read(&doc) else { continue };
         let Ok(mut d) = deckcraft_format::load(&bytes) else { continue };
         deckcraft_format::repair(&mut d);
         let path = meta.get("path").and_then(Value::as_str).map(str::to_string);
-        let title = meta.get("title").and_then(Value::as_str).filter(|t| !t.is_empty()).unwrap_or("Presentation");
+        let title = meta.get("title").and_then(Value::as_str).filter(|t| !t.is_empty()).unwrap_or("Presentation").to_string();
+        // Take the entry over (so another instance starting now leaves it alone), keeping its
+        // snapshot until this one writes a newer one.
+        claim_dir(dir);
+        if let Some(o) = meta.as_object_mut() {
+            o.insert("owner".into(), json!(me));
+        }
+        if let Err(e) = write_atomic(&meta_path, meta.to_string().as_bytes()) {
+            log::warn!("recovery: {e}");
+        }
         let mut st = DocState::new(d, path, format!("{title} (Recovered)"));
+        st.uid = uid;
         // Unsaved: the copy on disk (if any) is older than what was recovered.
         st.saved_doc = std::sync::Arc::new((*st.doc).clone());
         st.revision += 1;
         opened.push(s.add_document(st));
-        discard(dir, uid);
     }
+    remove_stale_locks(dir);
     Ok(opened)
 }
 
+/// Delete the lock files of instances that are no longer running.
+fn remove_stale_locks(dir: &Path) {
+    let me = instance_id();
+    let Ok(rd) = std::fs::read_dir(dir) else { return };
+    for e in rd.flatten() {
+        let name = e.file_name();
+        let Some(owner) =
+            name.to_str().and_then(|n| n.strip_prefix("owner-")).and_then(|n| n.strip_suffix(".lock")).and_then(|n| n.parse::<u64>().ok())
+        else {
+            continue;
+        };
+        if owner != me && !owner_alive(dir, owner) {
+            let _ = std::fs::remove_file(e.path());
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -139,16 +237,67 @@ mod tests {
         assert!(st.is_dirty());
         assert_eq!(st.doc.slides.len(), 2);
         assert!(st.title().ends_with("(Recovered)"));
-        assert!(list(&dir).is_empty(), "entries are consumed");
-        // Saving drops the entry.
-        s.recovery_dir = Some(dir.clone());
-        assert_eq!(save(&s, &dir).unwrap(), 1);
+        assert_eq!(list(&dir).len(), 1, "the snapshot stays until it is replaced or saved");
+        // A second "crash" before any checkpoint: the presentation is recovered again.
+        let mut s3 = Session::new();
+        assert_eq!(open(&mut s3, &dir).unwrap().len(), 1);
+        assert_eq!(s3.doc().unwrap().doc.slides.len(), 2);
+        // Opening again in the same session doesn't duplicate it.
+        assert!(open(&mut s3, &dir).unwrap().is_empty());
+        // Saving the recovered presentation drops the entry.
+        s3.recovery_dir = Some(dir.clone());
         let path = dir.join("saved.deckcraft");
-        s.execute("file.saveAs", &json!({"path": path.to_string_lossy()})).unwrap();
+        s3.execute("file.saveAs", &json!({"path": path.to_string_lossy()})).unwrap();
         assert!(list(&dir).is_empty());
         let _ = std::fs::remove_dir_all(&dir);
     }
 
+    #[test]
+    fn uids_are_unique_beyond_this_process() {
+        let a = DocState::new(Default::default(), None, "a".into());
+        let b = DocState::new(Default::default(), None, "b".into());
+        assert_ne!(a.uid, b.uid);
+        // Not the small per-process numbers every instance used to start from.
+        assert!(a.uid >= 1 << 24 && a.uid <= UID_MASK);
+    }
+
+    #[test]
+    fn another_running_instance_keeps_its_entries() {
+        let dir = temp("recovery-shared");
+        std::fs::create_dir_all(&dir).unwrap();
+        // Another instance (its own owner id and uid, its lock held) has an unsaved presentation.
+        let other = instance_id() ^ (1 << 40);
+        let lock = File::create(lock_path(&dir, other)).unwrap();
+        lock.try_lock().unwrap();
+        let mut o = Session::new();
+        o.execute("file.new", &json!({})).unwrap();
+        o.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+        let bytes = deckcraft_format::save(&o.doc().unwrap().doc).unwrap();
+        let uid = other + 5;
+        let (d, m) = files(&dir, uid);
+        std::fs::write(&d, bytes).unwrap();
+        std::fs::write(&m, json!({"title": "Theirs", "owner": other}).to_string()).unwrap();
+        // This instance saving its clean and dirty presentations leaves that entry alone...
+        let mut s = Session::new();
+        s.execute("file.new", &json!({})).unwrap();
+        s.execute("file.new", &json!({})).unwrap();
+        s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+        assert_eq!(save(&s, &dir).unwrap(), 1);
+        assert!(list(&dir).iter().any(|e| e.0 == uid));
+        // ...and a recovery open here skips it while its owner runs.
+        let mut s2 = Session::new();
+        let opened = open(&mut s2, &dir).unwrap();
+        assert!(s2.documents().iter().all(|d| d.uid != uid), "{opened:?}");
+        assert!(lock_path(&dir, other).exists(), "a live owner's lock stays");
+        // Once the owner is gone, its entry is recovered and its lock file cleaned up.
+        drop(lock);
+        let mut s3 = Session::new();
+        open(&mut s3, &dir).unwrap();
+        assert!(s3.documents().iter().any(|d| d.uid == uid && d.title().starts_with("Theirs")));
+        assert!(!lock_path(&dir, other).exists());
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+
     #[test]
     fn corrupt_entries_are_skipped() {
         let dir = temp("recovery-corrupt");

From 5d4bfc08466064a5c1b4e400944f6840df23283d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:57:08 +0300
Subject: [PATCH 132/376] Media: keep playback with the document and the clip

Shape ids are local to one presentation, and decoded audio was cached by the
address of a buffer the cache did not keep. Switching decks, closing the last
one, or replacing a clip could keep the previous sound. Playback now stops
when the document changes or closes, a new source replaces the voice's audio,
and the decode and duration caches hold the bytes they are keyed by.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                   |   2 +
 crates/media/src/player.rs   | 159 ++++++++++++++++-----
 crates/ui-egui/src/canvas.rs |   9 +-
 crates/ui-egui/src/lib.rs    |   9 +-
 crates/ui-egui/src/media.rs  | 267 ++++++++++++++++++++++++++++++-----
 crates/ui-egui/src/show.rs   |  18 +--
 6 files changed, 380 insertions(+), 84 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..d25b5fd3 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Playback stays with its document and its clip (#415): switching decks or closing the last one stops the previous sound, replacing a clip plays the new one, and the duration and decode caches keep the bytes they are keyed by |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: media playback follows the open document and clip (#415) |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/media/src/player.rs b/crates/media/src/player.rs
index 9ac4a804..1e069544 100644
--- a/crates/media/src/player.rs
+++ b/crates/media/src/player.rs
@@ -6,9 +6,11 @@
 //! heard. Without an output device (web, CI, no sound card) [`Player::tick`] advances the clocks on
 //! wall time instead, so playback, looping and video still work silently.
 //!
-//! Audio is decoded once per media item (on a worker thread where there are threads) and cached;
-//! a voice whose audio is still decoding holds at its start (`Loading`), one whose audio can't be
-//! decoded runs silently.
+//! Audio is decoded once per media item (on a worker thread where there are threads) and cached.
+//! The cache keeps those source bytes: its key is the allocation's address, which would otherwise
+//! be free to reuse for different media. A voice whose audio is still decoding holds at its start
+//! (`Loading`); one whose audio can't be decoded runs silently. Playing a voice again with a
+//! different source replaces its audio instead of keeping the previous clip.
 
 use std::collections::HashMap;
 use std::sync::{Arc, Mutex, OnceLock};
@@ -66,8 +68,17 @@ pub struct VoiceStatus {
 
 type Slot = Arc<OnceLock<Result<Arc<Pcm>, String>>>;
 
+/// One decoded item. `source` keeps the allocation `media_key` names alive for as long as the
+/// entry does, so a later buffer cannot be given that address and read this PCM.
+struct CachedAudio {
+    slot: Slot,
+    source: Bytes,
+}
+
 struct Voice {
     key: u64,
+    /// Identity of the bytes this voice is playing. A different key replaces `audio`.
+    media_key: u64,
     audio: Option<Slot>,
     spec: VoiceSpec,
     t: f64,
@@ -192,7 +203,7 @@ pub struct Player {
     mixer: Arc<Mutex<Mixer>>,
     last_tick: Option<f64>,
     idle_since: Option<f64>,
-    cache: HashMap<u64, Slot>,
+    cache: HashMap<u64, CachedAudio>,
 }
 
 impl Player {
@@ -213,49 +224,61 @@ impl Player {
     /// The decoded audio of `bytes`, cached by `media_key` (decoding starts now).
     fn slot(&mut self, media_key: u64, bytes: &Bytes) -> Slot {
         if self.cache.len() > 16 {
-            // Forget audio no voice uses.
-            let used: Vec<u64> = self.cache.iter().filter(|(_, s)| Arc::strong_count(s) > 1).map(|(k, _)| *k).collect();
+            // Forget audio no voice uses. Dropping the entry drops its source bytes too.
+            let used: Vec<u64> = self.cache.iter().filter(|(_, c)| Arc::strong_count(&c.slot) > 1).map(|(k, _)| *k).collect();
             self.cache.retain(|k, _| used.contains(k));
         }
-        self.cache
-            .entry(media_key)
-            .or_insert_with(|| {
-                let slot: Slot = Arc::new(OnceLock::new());
-                let (s, b) = (slot.clone(), bytes.clone());
-                let job = move || {
-                    let _ = s.set(crate::audio::decode(&b).map(Arc::new).map_err(|e| e.to_string()));
-                };
-                if crate::THREADS {
-                    if std::thread::Builder::new().name("deckcraft-audio-decode".into()).spawn(job).is_err() {
-                        let _ = slot.set(Err("couldn't start the decoder".into()));
-                    }
-                } else {
-                    job();
-                }
-                slot
-            })
-            .clone()
+        if let Some(hit) = self.cache.get(&media_key)
+            && Arc::as_ptr(&hit.source) as u64 == media_key
+        {
+            return hit.slot.clone();
+        }
+        // A key whose bytes are gone is not this clip. Decode again.
+        self.cache.remove(&media_key);
+        let slot: Slot = Arc::new(OnceLock::new());
+        let (s, b) = (slot.clone(), bytes.clone());
+        let job = move || {
+            let _ = s.set(crate::audio::decode(&b).map(Arc::new).map_err(|e| e.to_string()));
+        };
+        if crate::THREADS {
+            if std::thread::Builder::new().name("deckcraft-audio-decode".into()).spawn(job).is_err() {
+                let _ = slot.set(Err("couldn't start the decoder".into()));
+            }
+        } else {
+            job();
+        }
+        let cached = CachedAudio { slot: slot.clone(), source: bytes.clone() };
+        self.cache.insert(media_key, cached);
+        slot
     }
 
     /// Play voice `key` (a shape) from `from` seconds (default: the trimmed start). Resumes a
-    /// paused voice when `from` is `None`.
+    /// paused voice when `from` is `None` and `media_key` is unchanged. A different `media_key`
+    /// replaces the decoded audio and starts the new clip (at `from`, or at its start).
     pub fn play(&mut self, key: u64, media_key: u64, bytes: &Bytes, spec: VoiceSpec, from: Option<f64>) {
         let audio = spec.audio.then(|| self.slot(media_key, bytes));
         self.with(|m| {
             if let Some(v) = m.voices.iter_mut().find(|v| v.key == key) {
+                let same = v.media_key == media_key;
+                v.media_key = media_key;
                 v.spec = spec;
-                if v.audio.is_none() {
+                if same {
+                    if v.audio.is_none() {
+                        v.audio = audio;
+                    }
+                    if let Some(t) = from {
+                        v.t = t;
+                    } else if v.state == PlayState::Ended {
+                        v.t = spec.clip.range(v.duration()).0;
+                    }
+                } else {
                     v.audio = audio;
-                }
-                if let Some(t) = from {
-                    v.t = t;
-                } else if v.state == PlayState::Ended {
-                    v.t = spec.clip.range(v.duration()).0;
+                    v.t = from.unwrap_or_else(|| spec.clip.range(spec.duration).0);
                 }
                 v.state = PlayState::Playing;
             } else {
-                let t = from.unwrap_or(spec.clip.range(spec.duration).0);
-                m.voices.push(Voice { key, audio, spec, t, state: PlayState::Playing });
+                let t = from.unwrap_or_else(|| spec.clip.range(spec.duration).0);
+                m.voices.push(Voice { key, media_key, audio, spec, t, state: PlayState::Playing });
             }
         });
         self.ensure_stream();
@@ -459,6 +482,7 @@ mod tests {
         let mut m = Mixer {
             voices: vec![Voice {
                 key: 1,
+                media_key: 1,
                 audio: Some(slot),
                 spec: VoiceSpec { clip, looping: false, duration: 1.0, audio: true },
                 t: 0.0,
@@ -502,4 +526,73 @@ mod tests {
         let pos = p.status(3).map(|s| s.position).unwrap_or(-1.0);
         assert!((pos - 0.1).abs() < 1e-6, "{pos}");
     }
+
+    /// 16-bit mono WAV of a constant level, `secs` long at 8 kHz.
+    fn wav_level(secs: f64, amp: f32) -> Bytes {
+        let rate = 8_000u32;
+        let n = (rate as f64 * secs).round() as usize;
+        let data: Vec<u8> = (0..n).flat_map(|_| ((amp * 32767.0) as i16).to_le_bytes()).collect();
+        let mut b = Vec::new();
+        b.extend_from_slice(b"RIFF");
+        b.extend_from_slice(&(36 + data.len() as u32).to_le_bytes());
+        b.extend_from_slice(b"WAVEfmt ");
+        b.extend_from_slice(&16u32.to_le_bytes());
+        b.extend_from_slice(&1u16.to_le_bytes());
+        b.extend_from_slice(&1u16.to_le_bytes());
+        b.extend_from_slice(&rate.to_le_bytes());
+        b.extend_from_slice(&(rate * 2).to_le_bytes());
+        b.extend_from_slice(&2u16.to_le_bytes());
+        b.extend_from_slice(&16u16.to_le_bytes());
+        b.extend_from_slice(b"data");
+        b.extend_from_slice(&(data.len() as u32).to_le_bytes());
+        b.extend_from_slice(&data);
+        Arc::new(b)
+    }
+
+    fn audible(duration: f64) -> VoiceSpec {
+        VoiceSpec { clip: ClipParams::default(), looping: false, duration, audio: true }
+    }
+
+    /// First mixed sample of voice `key`, after its audio has decoded.
+    fn first_sample(p: &Player, key: u64) -> f32 {
+        assert!(p.wait_loaded(key, std::time::Duration::from_secs(5)), "decode");
+        let mut buf = vec![0.0f32; 4];
+        p.render(&mut buf, 1, 8_000);
+        buf[0]
+    }
+
+    #[test]
+    fn replacing_the_source_plays_the_new_audio_and_keeps_its_bytes() {
+        let mut p = Player::new(None);
+        let loud = wav_level(0.05, 0.5);
+        let quiet = wav_level(0.10, 0.25);
+        let loud_key = Arc::as_ptr(&loud) as u64;
+        let quiet_key = Arc::as_ptr(&quiet) as u64;
+        assert_ne!(loud_key, quiet_key);
+
+        // Duration 0: the clock takes its length from the decoded audio, so a stale slot would
+        // report the previous clip.
+        p.play(1, loud_key, &loud, audible(0.0), None);
+        let got = first_sample(&p, 1);
+        assert!((got - 0.5).abs() < 0.02, "loud sample {got}");
+        let dur = p.status(1).map(|s| s.duration).unwrap_or(-1.0);
+        assert!((dur - 0.05).abs() < 0.01, "loud duration {dur}");
+        assert!(p.cache.get(&loud_key).is_some_and(|c| Arc::ptr_eq(&c.source, &loud)));
+
+        // The caller's buffer can go away; the cache still owns the allocation its key names.
+        drop(loud);
+        assert_eq!(Arc::as_ptr(&p.cache.get(&loud_key).expect("cached").source) as u64, loud_key);
+
+        p.play(1, quiet_key, &quiet, audible(0.0), None);
+        let got = first_sample(&p, 1);
+        assert!((got - 0.25).abs() < 0.02, "quiet sample {got}");
+        let dur = p.status(1).map(|s| s.duration).unwrap_or(-1.0);
+        assert!((dur - 0.10).abs() < 0.01, "quiet duration {dur}");
+        assert!(p.cache.get(&quiet_key).is_some_and(|c| Arc::ptr_eq(&c.source, &quiet)));
+        // Resuming the same source does not jump back to the start.
+        let pos = p.status(1).map(|s| s.position).unwrap_or(-1.0);
+        p.play(1, quiet_key, &quiet, audible(0.0), None);
+        let again = p.status(1).map(|s| s.position).unwrap_or(-1.0);
+        assert!((again - pos).abs() < 1e-6, "resume moved {pos} -> {again}");
+    }
 }
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..41a10cf7 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -106,7 +106,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     let px = ((slide_rect.width() * ppp).round().max(1.0) as u32, (slide_rect.height() * ppp).round().max(1.0) as u32);
     let now = ui.input(|i| i.time);
     let gifs = match app.session.active() {
-        Some(d) if d.selection.target == Target::Slides => app.media.gifs(&d.doc, d.selection.slide, now, &app.session.gif_paused),
+        Some(d) if d.selection.target == Target::Slides => app.media.gifs(d.uid, &d.doc, d.selection.slide, now, &app.session.gif_paused),
         _ => vec![],
     };
     crate::media::gif_repaint(ui.ctx(), &gifs);
@@ -276,6 +276,7 @@ fn media_frames(app: &SlideApp, painter: &egui::Painter, xf: Xf) {
 /// selection or hover).
 fn media_bar(app: &mut SlideApp, ui: &mut Ui, xf: Xf) {
     let Some(d) = app.session.active() else { return };
+    let uid = d.uid;
     if d.selection.target != Target::Slides || d.selection.text.is_some() || app.session.tool.dragging() {
         return;
     }
@@ -294,11 +295,11 @@ fn media_bar(app: &mut SlideApp, ui: &mut Ui, xf: Xf) {
     let bar = Rect::from_min_size(pos2(r.center().x - w / 2.0, r.max.y + 6.0), vec2(w, 26.0));
     let status = app.media.status(id);
     match crate::media::control_bar(ui, bar, status.as_ref(), &clip) {
-        Some(crate::media::BarAction::Toggle) => app.media.toggle(&doc, id, &clip, crate::media::Owner::Editor),
-        Some(crate::media::BarAction::Seek(t)) => app.media.seek(&doc, id, &clip, t, crate::media::Owner::Editor),
+        Some(crate::media::BarAction::Toggle) => app.media.toggle(uid, &doc, id, &clip, crate::media::Owner::Editor),
+        Some(crate::media::BarAction::Seek(t)) => app.media.seek(uid, &doc, id, &clip, t, crate::media::Owner::Editor),
         Some(crate::media::BarAction::Nudge(dt)) => {
             let pos = status.map(|s| s.position).unwrap_or(0.0);
-            app.media.seek(&doc, id, &clip, (pos + dt).max(0.0), crate::media::Owner::Editor);
+            app.media.seek(uid, &doc, id, &clip, (pos + dt).max(0.0), crate::media::Owner::Editor);
         }
         None => {}
     }
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..81de1fcf 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -668,8 +668,8 @@ impl SlideApp {
                 }
                 UiRequest::Media { action, shape, ms } => {
                     let owner = if self.show.is_some() { media::Owner::Show } else { media::Owner::Editor };
-                    if let Some(doc) = self.session.active().map(|d| d.doc.clone()) {
-                        self.media.request(&doc, &action, shape, ms, owner);
+                    if let Some((uid, doc)) = self.session.active().map(|d| (d.uid, d.doc.clone())) {
+                        self.media.request(uid, &doc, &action, shape, ms, owner);
                     }
                 }
             }
@@ -989,8 +989,11 @@ impl SlideApp {
         self.perf.frame_ms = now_ms() - t0;
     }
 
-    /// Media clocks and video textures; the editor's media stops when its slide is left.
+    /// Media clocks and video textures. Voices belong to the open presentation: closing the last
+    /// one, or switching decks, stops them. The editor's media also stops when its slide is left.
     fn tick_media(&mut self, ctx: &egui::Context) {
+        let uid = self.session.active().map(|d| d.uid);
+        self.media.set_document(uid);
         if !self.media.any_active() {
             self.session.media_status.clear();
             return;
diff --git a/crates/ui-egui/src/media.rs b/crates/ui-egui/src/media.rs
index f887c2b2..85b65ea1 100644
--- a/crates/ui-egui/src/media.rs
+++ b/crates/ui-egui/src/media.rs
@@ -25,13 +25,31 @@ struct Video {
     tex: Option<TextureHandle>,
 }
 
+/// A voice started for one shape in one presentation.
+struct Owned {
+    owner: Owner,
+    clip: MediaClip,
+    /// Address of the source bytes this voice was started with.
+    source: usize,
+}
+
+/// A probed duration. `source` keeps that allocation alive so a later buffer cannot reuse the
+/// address and inherit this length.
+struct Probed {
+    source: Arc<Vec<u8>>,
+    duration: f64,
+}
+
 pub struct MediaHost {
     player: Player,
-    owners: HashMap<ShapeId, (Owner, MediaClip)>,
+    /// Presentation the voices and GIF clocks belong to. `None` before the first document is
+    /// bound, and after the last one closes.
+    doc: Option<u64>,
+    owners: HashMap<ShapeId, Owned>,
     videos: HashMap<ShapeId, Video>,
-    /// Probed durations by media bytes (for media imported without a probe).
-    durations: HashMap<usize, f64>,
-    /// Animated GIF clocks: when each started and, while paused, the time it holds.
+    /// Probed durations keyed by the source allocation (media imported without a length).
+    durations: HashMap<usize, Probed>,
+    /// Animated GIF clocks for `doc`: when each started and, while paused, the time it holds.
     gifs: HashMap<ShapeId, (f64, Option<f64>)>,
 }
 
@@ -57,12 +75,68 @@ fn key(id: ShapeId) -> u64 {
 
 impl MediaHost {
     pub fn new(out: Option<Box<dyn AudioOut>>) -> MediaHost {
-        MediaHost { player: Player::new(out), owners: HashMap::new(), videos: HashMap::new(), durations: HashMap::new(), gifs: HashMap::new() }
+        MediaHost {
+            player: Player::new(out),
+            doc: None,
+            owners: HashMap::new(),
+            videos: HashMap::new(),
+            durations: HashMap::new(),
+            gifs: HashMap::new(),
+        }
+    }
+
+    /// Bind playback to the open presentation. `None` (nothing open) stops every voice. Switching
+    /// to a different document stops the previous one's voices and GIF clocks, so a shape id that
+    /// exists in both decks cannot keep the old clip.
+    pub fn set_document(&mut self, uid: Option<u64>) {
+        if self.doc == uid {
+            return;
+        }
+        if uid.is_none() || self.doc.is_some() {
+            self.stop_voices();
+            self.gifs.clear();
+        }
+        self.doc = uid;
+    }
+
+    fn ensure_doc(&mut self, uid: u64) {
+        self.set_document(Some(uid));
+    }
+
+    fn stop_voices(&mut self) {
+        self.player.stop_all();
+        self.owners.clear();
+        self.videos.clear();
+    }
+
+    /// Length of `bytes` in seconds, remembered for this allocation. The map keeps the bytes, and
+    /// stays within 16 entries.
+    fn duration_of(&mut self, bytes: &Arc<Vec<u8>>) -> f64 {
+        let media_key = Arc::as_ptr(bytes) as usize;
+        if let Some(hit) = self.durations.get(&media_key) {
+            return hit.duration;
+        }
+        if self.durations.len() >= 16 {
+            let drop_key = self
+                .durations
+                .iter()
+                .find(|(_, p)| Arc::strong_count(&p.source) <= 1)
+                .map(|(k, _)| *k)
+                .or_else(|| self.durations.keys().next().copied());
+            if let Some(k) = drop_key {
+                self.durations.remove(&k);
+            }
+        }
+        let duration = deckcraft_media::probe(bytes).map(|i| i.duration()).unwrap_or(0.0);
+        self.durations.insert(media_key, Probed { source: Arc::clone(bytes), duration });
+        duration
     }
 
     /// The animated GIF pictures directly on slide `index` at `now`: each plays from when it was
-    /// first shown; a paused one holds its time and resumes from it.
-    pub fn gifs(&mut self, doc: &Presentation, index: usize, now: f64, paused: &HashSet<ShapeId>) -> Vec<Gif> {
+    /// first shown; a paused one holds its time and resumes from it. Clocks belong to `doc_uid`
+    /// and are dropped when the open presentation changes.
+    pub fn gifs(&mut self, doc_uid: u64, doc: &Presentation, index: usize, now: f64, paused: &HashSet<ShapeId>) -> Vec<Gif> {
+        self.ensure_doc(doc_uid);
         let Some(slide) = doc.slides.get(index) else { return vec![] };
         let mut out = vec![];
         for sh in &slide.shapes {
@@ -85,9 +159,7 @@ impl MediaHost {
 
     /// Replace the audio output (the host injects cpal after start-up).
     pub fn set_output(&mut self, out: Option<Box<dyn AudioOut>>) {
-        self.player.stop_all();
-        self.owners.clear();
-        self.videos.clear();
+        self.stop_voices();
         self.player = Player::new(out);
     }
 
@@ -101,7 +173,7 @@ impl MediaHost {
     }
 
     pub fn owner(&self, id: ShapeId) -> Option<Owner> {
-        self.owners.get(&id).map(|o| o.0)
+        self.owners.get(&id).map(|o| o.owner)
     }
 
     /// Shapes with a voice (playing, paused or ended).
@@ -113,23 +185,21 @@ impl MediaHost {
         !self.owners.is_empty()
     }
 
-    /// Start (or resume) shape `id` from `from` seconds.
-    pub fn play(&mut self, doc: &Presentation, id: ShapeId, clip: &MediaClip, from: Option<f64>, owner: Owner) {
+    /// Start (or resume) shape `id` of presentation `doc_uid` from `from` seconds.
+    pub fn play(&mut self, doc_uid: u64, doc: &Presentation, id: ShapeId, clip: &MediaClip, from: Option<f64>, owner: Owner) {
+        self.ensure_doc(doc_uid);
         let Some(item) = doc.media(clip.media) else { return };
         let bytes = item.data.clone();
         let media_key = Arc::as_ptr(&bytes) as usize;
-        let duration = if clip.duration_ms > 0 {
-            clip.duration_ms as f64 / 1000.0
-        } else {
-            *self.durations.entry(media_key).or_insert_with(|| deckcraft_media::probe(&bytes).map(|i| i.duration()).unwrap_or(0.0))
-        };
+        let duration = if clip.duration_ms > 0 { clip.duration_ms as f64 / 1000.0 } else { self.duration_of(&bytes) };
         let spec = VoiceSpec {
             clip: ClipParams::from_ms(clip.trim_start_ms, clip.trim_end_ms, clip.fade_in_ms, clip.fade_out_ms, clip.volume),
             looping: clip.loop_play,
             duration,
             audio: clip.volume > 0.0,
         };
-        if clip.video && !self.videos.contains_key(&id) {
+        let source_changed = self.owners.get(&id).is_some_and(|o| o.source != media_key);
+        if clip.video && (source_changed || !self.videos.contains_key(&id)) {
             let feed = match VideoFeed::new(bytes.clone()) {
                 Ok(f) => Some(f),
                 Err(e) => {
@@ -138,20 +208,27 @@ impl MediaHost {
                 }
             };
             self.videos.insert(id, Video { feed, frame: None, tex: None });
+        } else if !clip.video {
+            self.videos.remove(&id);
         }
         self.player.play(key(id), media_key as u64, &bytes, spec, from);
-        self.owners.insert(id, (owner, clip.clone()));
+        self.owners.insert(id, Owned { owner, clip: clip.clone(), source: media_key });
     }
 
     pub fn pause(&mut self, id: ShapeId) {
         self.player.pause(key(id));
     }
 
-    pub fn toggle(&mut self, doc: &Presentation, id: ShapeId, clip: &MediaClip, owner: Owner) {
-        if self.is_playing(id) {
+    fn same_source(&self, doc: &Presentation, id: ShapeId, clip: &MediaClip) -> bool {
+        doc.media(clip.media).is_some_and(|item| self.owners.get(&id).is_some_and(|o| o.source == Arc::as_ptr(&item.data) as usize))
+    }
+
+    pub fn toggle(&mut self, doc_uid: u64, doc: &Presentation, id: ShapeId, clip: &MediaClip, owner: Owner) {
+        self.ensure_doc(doc_uid);
+        if self.is_playing(id) && self.same_source(doc, id, clip) {
             self.pause(id);
         } else {
-            self.play(doc, id, clip, None, owner);
+            self.play(doc_uid, doc, id, clip, None, owner);
         }
     }
 
@@ -162,16 +239,17 @@ impl MediaHost {
     }
 
     pub fn stop_owned(&mut self, owner: Owner) {
-        let ids: Vec<ShapeId> = self.owners.iter().filter(|(_, o)| o.0 == owner).map(|(id, _)| *id).collect();
+        let ids: Vec<ShapeId> = self.owners.iter().filter(|(_, o)| o.owner == owner).map(|(id, _)| *id).collect();
         for id in ids {
             self.stop(id);
         }
     }
 
-    /// Move to `t` seconds; a shape that isn't playing is cued there, paused.
-    pub fn seek(&mut self, doc: &Presentation, id: ShapeId, clip: &MediaClip, t: f64, owner: Owner) {
-        if self.status(id).is_none() {
-            self.play(doc, id, clip, Some(t), owner);
+    /// Move to `t` seconds; a shape that isn't playing, or whose clip changed, is cued there, paused.
+    pub fn seek(&mut self, doc_uid: u64, doc: &Presentation, id: ShapeId, clip: &MediaClip, t: f64, owner: Owner) {
+        self.ensure_doc(doc_uid);
+        if self.status(id).is_none() || !self.same_source(doc, id, clip) {
+            self.play(doc_uid, doc, id, clip, Some(t), owner);
             self.pause(id);
         }
         self.player.seek(key(id), t);
@@ -188,10 +266,10 @@ impl MediaHost {
         let now = ctx.input(|i| i.time);
         self.player.tick(now);
         let mut ended = vec![];
-        for (id, (_, clip)) in &self.owners {
+        for (id, owned) in &self.owners {
             if let Some(st) = self.player.status(key(*id))
                 && st.state == PlayState::Ended
-                && clip.rewind
+                && owned.clip.rewind
             {
                 ended.push(*id);
             }
@@ -239,16 +317,17 @@ impl MediaHost {
         playing
     }
 
-    /// Carry out a `media.*` request from the engine.
-    pub fn request(&mut self, doc: &Presentation, action: &str, id: ShapeId, ms: Option<u64>, owner: Owner) {
+    /// Carry out a `media.*` request from the engine for presentation `doc_uid`.
+    pub fn request(&mut self, doc_uid: u64, doc: &Presentation, action: &str, id: ShapeId, ms: Option<u64>, owner: Owner) {
+        self.ensure_doc(doc_uid);
         let Some(clip) = find_clip(doc, id) else { return };
         let t = ms.map(|v| v as f64 / 1000.0);
         match action {
-            "play" => self.play(doc, id, &clip, t, owner),
+            "play" => self.play(doc_uid, doc, id, &clip, t, owner),
             "pause" => self.pause(id),
-            "toggle" => self.toggle(doc, id, &clip, owner),
+            "toggle" => self.toggle(doc_uid, doc, id, &clip, owner),
             "stop" => self.stop(id),
-            "seek" => self.seek(doc, id, &clip, t.unwrap_or(0.0), owner),
+            "seek" => self.seek(doc_uid, doc, id, &clip, t.unwrap_or(0.0), owner),
             _ => {}
         }
     }
@@ -421,3 +500,121 @@ pub fn control_bar(ui: &mut Ui, rect: Rect, status: Option<&VoiceStatus>, clip:
     }
     action
 }
+
+#[cfg(test)]
+mod tests {
+    use std::collections::HashSet;
+    use std::sync::Arc;
+
+    use deckcraft_geom::Xfrm;
+    use deckcraft_model::style::PictureFill;
+    use deckcraft_model::{MediaClip, Presentation, Shape, ShapeId, ShapeKind};
+
+    use super::*;
+
+    /// 16-bit mono WAV of a constant level, `secs` long at 8 kHz.
+    fn wav_level(secs: f64, amp: f32) -> Vec<u8> {
+        let rate = 8_000u32;
+        let n = (rate as f64 * secs).round() as usize;
+        let data: Vec<u8> = (0..n).flat_map(|_| ((amp * 32767.0) as i16).to_le_bytes()).collect();
+        let mut b = Vec::new();
+        b.extend_from_slice(b"RIFF");
+        b.extend_from_slice(&(36 + data.len() as u32).to_le_bytes());
+        b.extend_from_slice(b"WAVEfmt ");
+        b.extend_from_slice(&16u32.to_le_bytes());
+        b.extend_from_slice(&1u16.to_le_bytes());
+        b.extend_from_slice(&1u16.to_le_bytes());
+        b.extend_from_slice(&rate.to_le_bytes());
+        b.extend_from_slice(&(rate * 2).to_le_bytes());
+        b.extend_from_slice(&2u16.to_le_bytes());
+        b.extend_from_slice(&16u16.to_le_bytes());
+        b.extend_from_slice(b"data");
+        b.extend_from_slice(&(data.len() as u32).to_le_bytes());
+        b.extend_from_slice(&data);
+        b
+    }
+
+    fn deck(shape: u32, bytes: Vec<u8>) -> (Presentation, ShapeId, MediaClip) {
+        let mut doc = Presentation::default();
+        let media = doc.add_media("clip.wav", "audio/wav", bytes);
+        let clip = MediaClip { media, volume: 1.0, ..Default::default() };
+        let id = ShapeId(shape);
+        let slide = Arc::make_mut(&mut doc.slides[0]);
+        slide.shapes.push(Shape { id, xfrm: Some(Xfrm::new(0.0, 0.0, 120.0, 40.0)), kind: ShapeKind::Media(clip.clone()), ..Default::default() });
+        (doc, id, clip)
+    }
+
+    /// First mixed sample of shape `id`, after its audio has decoded.
+    fn level(host: &MediaHost, id: ShapeId) -> f32 {
+        assert!(host.player.wait_loaded(key(id), std::time::Duration::from_secs(5)), "decode");
+        let mut buf = vec![0.0f32; 4];
+        host.player.render(&mut buf, 1, 8_000);
+        buf[0]
+    }
+
+    #[test]
+    fn playback_follows_the_document_and_the_clip() {
+        let (loud_doc, id, loud) = deck(4000, wav_level(0.05, 0.5));
+        let (quiet_doc, _, quiet) = deck(4000, wav_level(0.10, 0.25));
+        let mut host = MediaHost::new(None);
+
+        host.play(1, &loud_doc, id, &loud, None, Owner::Editor);
+        let sample = level(&host, id);
+        assert!((sample - 0.5).abs() < 0.02, "loud sample {sample}");
+        let dur = host.status(id).map(|s| s.duration).unwrap_or(-1.0);
+        assert!((dur - 0.05).abs() < 0.01, "loud duration {dur}");
+        let loud_bytes = &loud_doc.media(loud.media).expect("media").data;
+        let ptr = Arc::as_ptr(loud_bytes) as usize;
+        assert!(host.durations.get(&ptr).is_some_and(|p| Arc::ptr_eq(&p.source, loud_bytes)));
+
+        // Replacing the clip on the same shape plays the new bytes, not the voice already running.
+        host.play(1, &quiet_doc, id, &quiet, None, Owner::Editor);
+        let sample = level(&host, id);
+        assert!((sample - 0.25).abs() < 0.02, "replaced sample {sample}");
+        let dur = host.status(id).map(|s| s.duration).unwrap_or(-1.0);
+        assert!((dur - 0.10).abs() < 0.01, "replaced duration {dur}");
+        assert_eq!(host.player.keys(), vec![key(id)]);
+
+        // A second deck reuses the shape id. Leaving the first deck stops its voice.
+        host.set_document(Some(2));
+        assert!(host.status(id).is_none(), "the previous document's voice is gone");
+        host.play(2, &loud_doc, id, &loud, None, Owner::Editor);
+        let sample = level(&host, id);
+        assert!((sample - 0.5).abs() < 0.02, "second document sample {sample}");
+        let dur = host.status(id).map(|s| s.duration).unwrap_or(-1.0);
+        assert!((dur - 0.05).abs() < 0.01, "second document duration {dur}");
+
+        host.set_document(None);
+        assert!(host.ids().is_empty(), "closing the last document stops playback");
+        assert!(host.status(id).is_none());
+    }
+
+    #[test]
+    fn gif_clocks_do_not_carry_across_documents() {
+        let gif = |shape: u32| {
+            let mut doc = Presentation::default();
+            let media = doc.add_media("a.gif", "image/gif", b"GIF89a-not-animated".to_vec());
+            let id = ShapeId(shape);
+            let slide = Arc::make_mut(&mut doc.slides[0]);
+            slide.shapes.push(Shape {
+                id,
+                xfrm: Some(Xfrm::new(0.0, 0.0, 80.0, 80.0)),
+                kind: ShapeKind::Picture { fill: PictureFill { media, ..Default::default() } },
+                ..Default::default()
+            });
+            (doc, id)
+        };
+        let (a, id) = gif(7);
+        let (b, _) = gif(7);
+        let mut host = MediaHost::new(None);
+        let none = HashSet::new();
+        host.gifs(1, &a, 0, 10.0, &none);
+        assert_eq!(host.gifs.get(&id).map(|c| c.0), Some(10.0));
+        host.gifs(1, &a, 0, 12.0, &none);
+        assert_eq!(host.gifs.get(&id).map(|c| c.0), Some(10.0), "the same document keeps its clock");
+        host.gifs(2, &b, 0, 50.0, &none);
+        assert_eq!(host.gifs.get(&id).map(|c| c.0), Some(50.0), "a new document starts its own clock");
+        host.set_document(None);
+        assert!(host.gifs.is_empty());
+    }
+}
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..c8db8015 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -245,7 +245,7 @@ fn part_textures(ctx: &egui::Context, doc: &Presentation, from: Option<usize>, t
 
 pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     let ctx = ui.ctx().clone();
-    let Some(doc) = app.session.active().map(|d| d.doc.clone()) else {
+    let Some((doc_uid, doc)) = app.session.active().map(|d| (d.uid, d.doc.clone())) else {
         app.show = None;
         return;
     };
@@ -315,13 +315,13 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         }
     }
     let on_slide = !show.pen && !show.ended && show.blank.is_none() && !show.reading_bar_hit(&ctx);
-    let gif_click = if clicked && on_slide { gif_hit(&ctx, ui, &show, &doc, app) } else { None };
+    let gif_click = if clicked && on_slide { gif_hit(&ctx, ui, &show, doc_uid, &doc, app) } else { None };
     let media_click = if clicked && on_slide && gif_click.is_none() { media_hit(&ctx, ui, &show, &doc) } else { None };
     let link = if on_slide && gif_click.is_none() && media_click.is_none() { link_hit(&ctx, ui, &mut show, &doc) } else { None };
     if let Some(id) = gif_click {
         let _ = app.run("media.gifPlay", json!({"id": id}));
     } else if let Some((id, clip)) = media_click {
-        app.media.toggle(&doc, id, &clip, crate::media::Owner::Show);
+        app.media.toggle(doc_uid, &doc, id, &clip, crate::media::Owner::Show);
     } else if clicked && let Some(l) = &link {
         let last = show.last_viewed;
         match show.state.follow(&doc, &l.action, last) {
@@ -375,7 +375,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             keep = false;
         }
     }
-    show_media(app, &mut show, &doc);
+    show_media(app, &mut show, doc_uid, &doc);
     // Draw.
     let full = ui.max_rect();
     let painter = ui.painter_at(full);
@@ -405,7 +405,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             })
             .map(|m| m.0)
             .collect();
-        let gifs = app.media.gifs(&doc, idx, now, &app.session.gif_paused);
+        let gifs = app.media.gifs(doc_uid, &doc, idx, now, &app.session.gif_paused);
         let times: Vec<_> = gifs.iter().map(|g| (g.id, g.t)).collect();
         crate::media::gif_repaint(&ctx, &gifs);
         let gif = crate::media::gif_key(&gifs);
@@ -688,7 +688,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
 
 /// Start the media of a newly shown slide: media from the previous slide stops unless it plays
 /// across slides; media set to start automatically plays. Everything stops at the end.
-fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
+fn show_media(app: &mut SlideApp, show: &mut Show, doc_uid: u64, doc: &Presentation) {
     let cur = if show.ended { None } else { Some(show.state.slide) };
     if show.media_slide == cur {
         return;
@@ -706,7 +706,7 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
     if let Some(i) = cur {
         for (id, _, clip) in crate::media::slide_media(doc, i) {
             if clip.autoplay && !keep.contains(&id) {
-                app.media.play(doc, id, &clip, None, crate::media::Owner::Show);
+                app.media.play(doc_uid, doc, id, &clip, None, crate::media::Owner::Show);
             }
         }
     }
@@ -748,13 +748,13 @@ fn on_screen(srect: Rect, k: f32, x: &deckcraft_geom::Xfrm) -> Rect {
 }
 
 /// The animated GIF whose play/pause button is under the pointer on the shown slide.
-fn gif_hit(ctx: &egui::Context, ui: &Ui, show: &Show, doc: &Presentation, app: &mut SlideApp) -> Option<ShapeId> {
+fn gif_hit(ctx: &egui::Context, ui: &Ui, show: &Show, doc_uid: u64, doc: &Presentation, app: &mut SlideApp) -> Option<ShapeId> {
     let p = ctx.input(|i| i.pointer.interact_pos())?;
     let full = ui.max_rect();
     let avail = if show.reading { Rect::from_min_max(full.min, pos2(full.max.x, full.max.y - 34.0)) } else { full };
     let srect = fit(avail, doc);
     let k = srect.width() / doc.slide_size.width.max(1.0) as f32;
-    let gifs = app.media.gifs(doc, show.state.slide, ctx.input(|i| i.time), &app.session.gif_paused);
+    let gifs = app.media.gifs(doc_uid, doc, show.state.slide, ctx.input(|i| i.time), &app.session.gif_paused);
     gifs.iter().rev().find(|g| crate::media::gif_button_rect(on_screen(srect, k, &g.rect)).contains(p)).map(|g| g.id)
 }
 

From 6b071aa0535c4d6fef9b57a0067a7b260b383bc4 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 20:58:31 +0300
Subject: [PATCH 133/376] Video: check the whole picture store against a memory
 budget (#398)

Per-axis size caps let AV1 accept 65536x65536 frames (over 8 GiB of luma)
and did not count references or pictures in flight. A shared budget module
in deckcraft-bitstream sizes a picture with checked arithmetic, and the
AV1, VP9, HEVC and H.264 decoders refuse a picture size whose current
picture, reference slots and in-flight pictures would exceed 4 GiB (1 GiB
on 32-bit), before allocating. set_memory_budget lowers it for hosts and tests.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/av1/src/decoder.rs      | 59 ++++++++++++++++++++++++
 crates/bitstream/src/budget.rs | 82 ++++++++++++++++++++++++++++++++++
 crates/bitstream/src/lib.rs    |  3 ++
 crates/h264/src/decoder.rs     | 30 +++++++++++++
 crates/h264/src/synth_tests.rs | 40 +++++++++++++++++
 crates/hevc/src/decoder.rs     | 30 +++++++++++++
 crates/hevc/src/synth_tests.rs | 26 +++++++++++
 crates/vp9/src/decoder.rs      | 53 ++++++++++++++++++++++
 8 files changed, 323 insertions(+)
 create mode 100644 crates/bitstream/src/budget.rs

diff --git a/crates/av1/src/decoder.rs b/crates/av1/src/decoder.rs
index 66c96698..88a29d99 100644
--- a/crates/av1/src/decoder.rs
+++ b/crates/av1/src/decoder.rs
@@ -206,12 +206,35 @@ pub struct Decoder {
     /// Frames submitted to the workers and not known to be finished (oldest first).
     in_flight: VecDeque<Arc<FrameSlot>>,
     max_in_flight: usize,
+    /// Bytes the picture store may take ([`deckcraft_bitstream::budget`]).
+    memory_budget: u64,
     /// Shown pictures not yet returned, in output order.
     out: VecDeque<Output>,
     /// pts of the temporal unit being decoded.
     pts: i64,
 }
 
+/// Whether `pictures` frames of `width` x `height`, padded as `FrameBuf::new` pads them, fit in
+/// `budget` bytes.
+fn store_fits(width: u32, height: u32, color: &crate::header::ColorConfig, pictures: usize, budget: u64) -> bool {
+    let shape = deckcraft_bitstream::budget::PictureShape {
+        width: u64::from(width).div_ceil(128) * 128 + 160,
+        height: u64::from(height).div_ceil(128) * 128 + 160,
+        shift_x: u32::from(color.subsampling_x),
+        shift_y: u32::from(color.subsampling_y),
+        chroma_planes: if color.mono_chrome { 0 } else { 2 },
+        bytes_per_sample: 2,
+    };
+    shape.fits(pictures as u64, budget)
+}
+
+impl Decoder {
+    /// Cap the bytes of decoded pictures (references, current, in flight) this decoder may hold.
+    pub fn set_memory_budget(&mut self, bytes: u64) {
+        self.memory_budget = bytes;
+    }
+}
+
 fn default_threads() -> usize {
     #[cfg(all(feature = "threads", not(target_arch = "wasm32")))]
     {
@@ -268,6 +291,7 @@ impl Decoder {
             workers,
             in_flight: VecDeque::new(),
             max_in_flight: fthreads + 2,
+            memory_budget: deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET,
             out: VecDeque::new(),
             pts: 0,
         }
@@ -508,6 +532,12 @@ impl Decoder {
         if fh.upscaled_width > 65536 || fh.frame_height > 65536 {
             return Err(Error::Invalid("frame size"));
         }
+        // The axis cap alone allows 8 GiB pictures: check the whole store (every reference slot,
+        // the new frame and those in flight, as `FrameBuf::new` pads them) before allocating.
+        let width = fh.upscaled_width.max(fh.frame_width);
+        if !store_fits(width, fh.frame_height, &seq.color, NUM_REF_FRAMES + 1 + self.max_in_flight, self.memory_budget) {
+            return Err(Error::Invalid("frame size exceeds the decoder memory budget"));
+        }
         if !fh.frame_is_intra {
             for i in 0..REFS_PER_FRAME {
                 if self.ref_frames[fh.ref_frame_idx[i]].is_none() {
@@ -947,3 +977,32 @@ fn project(fs: &mut FrameState, src: usize, dst_sign: i32) -> bool {
     }
     true
 }
+
+#[cfg(test)]
+mod budget_tests {
+    use super::*;
+    use deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET;
+
+    fn color(mono: bool) -> crate::header::ColorConfig {
+        crate::header::ColorConfig { mono_chrome: mono, subsampling_x: 1, subsampling_y: 1, ..Default::default() }
+    }
+
+    #[test]
+    fn the_axis_maximum_is_over_budget_and_4k_is_not() {
+        let refs = NUM_REF_FRAMES + 1 + 4;
+        assert!(!store_fits(65536, 65536, &color(false), refs, DECODE_MEMORY_BUDGET));
+        assert!(!store_fits(65536, 65536, &color(true), 1, DECODE_MEMORY_BUDGET));
+        assert!(store_fits(3840, 2160, &color(false), refs, DECODE_MEMORY_BUDGET));
+        assert!(store_fits(1920, 1080, &color(false), refs, DECODE_MEMORY_BUDGET));
+    }
+
+    #[test]
+    fn exact_budget_boundary_and_reference_count() {
+        // 8x8 pads to 288x288: luma 82944 + chroma 2 * 20736 samples, 2 bytes each.
+        let one = (288 * 288 + 2 * 144 * 144) * 2;
+        assert!(store_fits(8, 8, &color(false), 9, 9 * one));
+        assert!(!store_fits(8, 8, &color(false), 9, 9 * one - 1));
+        assert!(!store_fits(8, 8, &color(false), 10, 9 * one));
+        assert!(store_fits(8, 8, &color(true), 9, 9 * 288 * 288 * 2));
+    }
+}
diff --git a/crates/bitstream/src/budget.rs b/crates/bitstream/src/budget.rs
new file mode 100644
index 00000000..cf98df2c
--- /dev/null
+++ b/crates/bitstream/src/budget.rs
@@ -0,0 +1,82 @@
+//! Memory budget for decoded pictures, shared by the video decoders.
+//!
+//! A per-axis size cap does not bound memory: a decoder holds the current picture, every
+//! reference picture and the pictures still being decoded on worker threads. Each decoder checks
+//! the whole picture store against [`DECODE_MEMORY_BUDGET`] with checked arithmetic before it
+//! allocates for a new picture size, so a hostile header is an error, not an out-of-memory abort.
+
+/// Bytes the decoded pictures of one decoder may take: 4 GiB on 64-bit targets, 1 GiB on 32-bit
+/// ones (wasm32 has a 4 GiB address space in all).
+pub const DECODE_MEMORY_BUDGET: u64 = if cfg!(target_pointer_width = "64") { 4 << 30 } else { 1 << 30 };
+
+/// The shape of one decoded picture as a decoder allocates it.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct PictureShape {
+    /// Allocated luma samples per row and rows (padding included).
+    pub width: u64,
+    pub height: u64,
+    /// Chroma subsampling shifts (0 or 1); ignored when `chroma_planes` is 0.
+    pub shift_x: u32,
+    pub shift_y: u32,
+    /// Chroma planes (0 for monochrome, 2 otherwise).
+    pub chroma_planes: u64,
+    /// Bytes per sample (1 for 8-bit buffers, 2 for 16-bit ones).
+    pub bytes_per_sample: u64,
+}
+
+impl PictureShape {
+    /// Bytes of one picture, `None` if it does not fit in a `u64`.
+    pub fn bytes(&self) -> Option<u64> {
+        let luma = self.width.checked_mul(self.height)?;
+        let cw = self.width.div_ceil(1 << self.shift_x.min(1));
+        let ch = self.height.div_ceil(1 << self.shift_y.min(1));
+        let chroma = cw.checked_mul(ch)?.checked_mul(self.chroma_planes)?;
+        luma.checked_add(chroma)?.checked_mul(self.bytes_per_sample)
+    }
+
+    /// Bytes of `pictures` such pictures, `None` on overflow.
+    pub fn store_bytes(&self, pictures: u64) -> Option<u64> {
+        self.bytes()?.checked_mul(pictures)
+    }
+
+    /// Whether `pictures` such pictures fit in `budget` bytes.
+    pub fn fits(&self, pictures: u64, budget: u64) -> bool {
+        self.store_bytes(pictures).is_some_and(|b| b <= budget)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn shape(w: u64, h: u64) -> PictureShape {
+        PictureShape { width: w, height: h, shift_x: 1, shift_y: 1, chroma_planes: 2, bytes_per_sample: 2 }
+    }
+
+    #[test]
+    fn bytes_count_luma_and_subsampled_chroma() {
+        assert_eq!(shape(4, 4).bytes(), Some((16 + 2 * 4) * 2));
+        // Odd sizes round chroma up.
+        assert_eq!(shape(3, 3).bytes(), Some((9 + 2 * 4) * 2));
+        let mono = PictureShape { chroma_planes: 0, bytes_per_sample: 1, ..shape(10, 10) };
+        assert_eq!(mono.bytes(), Some(100));
+        let full = PictureShape { shift_x: 0, shift_y: 0, ..shape(10, 10) };
+        assert_eq!(full.bytes(), Some(600));
+    }
+
+    #[test]
+    fn exact_budget_boundary() {
+        let s = shape(4, 4); // 48 bytes
+        assert!(s.fits(10, 480));
+        assert!(!s.fits(10, 479));
+        assert!(!s.fits(11, 480));
+    }
+
+    #[test]
+    fn overflow_is_never_within_budget() {
+        let huge = shape(u64::MAX / 2, 3);
+        assert_eq!(huge.bytes(), None);
+        assert!(!huge.fits(1, u64::MAX));
+        assert!(!shape(1 << 31, 1 << 31).fits(u64::MAX, u64::MAX));
+    }
+}
diff --git a/crates/bitstream/src/lib.rs b/crates/bitstream/src/lib.rs
index 48884673..f25a3d33 100644
--- a/crates/bitstream/src/lib.rs
+++ b/crates/bitstream/src/lib.rs
@@ -3,12 +3,15 @@
 //! - [`BitReader`]: MSB-first reader with Exp-Golomb (`ue(v)`, `se(v)`), as used by H.264/HEVC/AV1 headers.
 //! - [`BitWriter`]: the matching writer (for encoders and header rewriting).
 //! - [`unescape_rbsp`] / [`escape_rbsp`]: remove/insert H.264/HEVC emulation-prevention bytes.
+//! - [`budget`]: the memory budget video decoders check their picture store against.
 //! - [`annexb_nals`] / [`length_prefixed_nals`]: split Annex-B byte streams and AVCC/HVCC samples into NAL units.
 
 #![cfg_attr(not(test), deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable))]
 
 use std::fmt;
 
+pub mod budget;
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum BitError {
     /// Tried to read past the end of the buffer.
diff --git a/crates/h264/src/decoder.rs b/crates/h264/src/decoder.rs
index 5f8941ea..ba105539 100644
--- a/crates/h264/src/decoder.rs
+++ b/crates/h264/src/decoder.rs
@@ -95,6 +95,8 @@ pub struct Decoder {
     pool: Option<rayon::ThreadPool>,
     in_flight: VecDeque<FrameRef>,
     max_in_flight: usize,
+    /// Bytes the picture store may take ([`deckcraft_bitstream::budget`]).
+    memory_budget: u64,
     threads: usize,
     /// Draft mode: skip deblocking of non-reference pictures ([`Decoder::set_draft`]).
     draft: bool,
@@ -178,6 +180,7 @@ impl Decoder {
             pool,
             in_flight: VecDeque::new(),
             max_in_flight: threads.max(1) + 2,
+            memory_budget: deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET,
             threads: workers,
             draft: false,
         }
@@ -421,7 +424,34 @@ impl Decoder {
         Ok(())
     }
 
+    /// Cap the bytes of decoded pictures (current, references, in flight) this decoder may hold.
+    pub fn set_memory_budget(&mut self, bytes: u64) {
+        self.memory_budget = bytes;
+    }
+
+    /// Refuse an SPS whose pictures would not fit the memory budget, before anything is allocated.
+    fn check_budget(&self, sps: &Sps) -> Result<()> {
+        let chroma = sps.chroma_array_type();
+        let shape = deckcraft_bitstream::budget::PictureShape {
+            width: u64::from(sps.width()),
+            height: u64::from(sps.height()),
+            shift_x: u32::from(chroma != 3),
+            shift_y: u32::from(chroma == 1),
+            chroma_planes: if chroma == 0 { 0 } else { 2 },
+            bytes_per_sample: 1,
+        };
+        let pictures = (sps.max_dpb_frames() + 1 + self.max_in_flight) as u64;
+        ensure!(
+            shape.fits(pictures, self.memory_budget),
+            "{}x{} pictures with {pictures} in the decoder exceed the memory budget",
+            sps.width(),
+            sps.height()
+        );
+        Ok(())
+    }
+
     fn start_picture(&mut self, sh: &SliceHeader, sps: &Arc<Sps>, pts: i64) -> Result<()> {
+        self.check_budget(sps)?;
         // Activate SPS; a resolution change flushes the DPB.
         let changed = match &self.active_sps {
             None => true,
diff --git a/crates/h264/src/synth_tests.rs b/crates/h264/src/synth_tests.rs
index b0e0d5d0..99d24303 100644
--- a/crates/h264/src/synth_tests.rs
+++ b/crates/h264/src/synth_tests.rs
@@ -539,3 +539,43 @@ fn poc_type1_reordering() {
         }
     }
 }
+
+/// One IDR picture of PCM macroblocks.
+fn idr_stream(max_refs: u32) -> Vec<u8> {
+    let mut seed = 5u32;
+    let mbs: Vec<Option<Vec<u8>>> = (0..NMB).map(|_| Some(random_mb(&mut seed))).collect();
+    let mut stream = sps(66, max_refs, false, PocType::T2);
+    stream.extend(pps(false, false));
+    stream.extend(slice_nal(&Pic { idr: true, frame_num: 0, ref_idc: 3, mbs, ..Default::default() }, false));
+    stream
+}
+
+fn decodes_within(stream: &[u8], budget: u64) -> bool {
+    let mut dec = Decoder::with_threads(1);
+    dec.set_memory_budget(budget);
+    let Ok(mut out) = dec.decode(stream, 0) else { return false };
+    out.extend(dec.flush());
+    dec.take_error().is_none() && out.len() == 1
+}
+
+#[test]
+fn picture_store_is_checked_against_the_memory_budget() {
+    let stream = idr_stream(4);
+    let sps_nal = sps(66, 4, false, PocType::T2);
+    let parsed = crate::params::Sps::parse(&deckcraft_bitstream::unescape_rbsp(&sps_nal[5..])).unwrap();
+    // 4:2:0, 8-bit: luma plus two quarter-size chroma planes per picture; the DPB, the current
+    // picture and threads + 2 in flight.
+    let one = (NMB * 256 + 2 * NMB * 64) as u64;
+    let pictures = (parsed.max_dpb_frames() + 1 + 3) as u64;
+    assert!(decodes_within(&stream, pictures * one));
+    assert!(!decodes_within(&stream, pictures * one - 1));
+    assert!(decodes_within(&stream, deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET));
+}
+
+#[test]
+fn largest_accepted_h264_size_is_over_the_default_budget() {
+    // 1024 x 1024 macroblocks (16384 x 16384) with 16 references and 3 in flight.
+    let shape =
+        deckcraft_bitstream::budget::PictureShape { width: 16384, height: 16384, shift_x: 1, shift_y: 1, chroma_planes: 2, bytes_per_sample: 1 };
+    assert!(!shape.fits(16 + 1 + 3, deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET));
+}
diff --git a/crates/hevc/src/decoder.rs b/crates/hevc/src/decoder.rs
index cd5450fd..9038c3ad 100644
--- a/crates/hevc/src/decoder.rs
+++ b/crates/hevc/src/decoder.rs
@@ -88,6 +88,8 @@ pub struct Decoder {
     pool: Option<rayon::ThreadPool>,
     in_flight: VecDeque<FrameRef>,
     max_in_flight: usize,
+    /// Bytes the picture store may take ([`deckcraft_bitstream::budget`]).
+    memory_budget: u64,
     draft: bool,
 }
 
@@ -142,6 +144,7 @@ impl Decoder {
             pool,
             in_flight: VecDeque::new(),
             max_in_flight: threads.max(1) + 2,
+            memory_budget: deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET,
             draft: false,
         }
     }
@@ -372,7 +375,34 @@ impl Decoder {
         Ok(())
     }
 
+    /// Cap the bytes of decoded pictures (current, references, in flight) this decoder may hold.
+    pub fn set_memory_budget(&mut self, bytes: u64) {
+        self.memory_budget = bytes;
+    }
+
+    /// Refuse an SPS whose pictures would not fit the memory budget, before anything is allocated.
+    fn check_budget(&self, sps: &Sps) -> Result<()> {
+        let chroma = sps.chroma_array_type();
+        let shape = deckcraft_bitstream::budget::PictureShape {
+            width: u64::from(sps.width),
+            height: u64::from(sps.height),
+            shift_x: u32::from(sps.sub_width_c() == 2),
+            shift_y: u32::from(sps.sub_height_c() == 2),
+            chroma_planes: if chroma == 0 { 0 } else { 2 },
+            bytes_per_sample: 2,
+        };
+        let pictures = u64::from(sps.max_dec_pic_buffering) + 1 + self.max_in_flight as u64;
+        ensure!(
+            shape.fits(pictures, self.memory_budget),
+            "{}x{} pictures with {pictures} in the decoder exceed the memory budget",
+            sps.width,
+            sps.height
+        );
+        Ok(())
+    }
+
     fn start_picture(&mut self, sh: &SliceHeader, sps: &Arc<Sps>, pps: &Arc<Pps>, pts: i64) -> Result<()> {
+        self.check_budget(sps)?;
         ensure!(sh.first_slice_segment_in_pic && !sh.dependent, "invalid first slice segment");
         let hdr = sh.nal;
         let changed = match &self.active_sps {
diff --git a/crates/hevc/src/synth_tests.rs b/crates/hevc/src/synth_tests.rs
index 2d5b9fcf..dc225571 100644
--- a/crates/hevc/src/synth_tests.rs
+++ b/crates/hevc/src/synth_tests.rs
@@ -618,3 +618,29 @@ fn slices_without_tiles() {
     ];
     run("slices", None, false, segs);
 }
+
+/// Decode with a memory budget of `budget` bytes; true if every picture came out without error.
+fn decodes_within(stream: &[u8], budget: u64) -> bool {
+    let mut dec = Decoder::with_threads(1);
+    dec.set_memory_budget(budget);
+    let mut pics = match dec.decode(stream, 0) {
+        Ok(p) => p,
+        Err(_) => return false,
+    };
+    pics.extend(dec.flush());
+    dec.take_error().is_none() && pics.len() == 5
+}
+
+#[test]
+fn picture_store_is_checked_against_the_memory_budget() {
+    let (stream, _) = sequence(&None, true, whole(WC * HC));
+    let sps_nal = sps(true);
+    let parsed = crate::params::Sps::parse(&deckcraft_bitstream::unescape_rbsp(&sps_nal[6..])).unwrap();
+    // 96x64 4:2:0 in 16-bit samples; the decoder holds the DPB, the current picture and up to
+    // threads + 2 in flight.
+    let one = (W * H + 2 * (W / 2) * (H / 2)) as u64 * 2;
+    let pictures = u64::from(parsed.max_dec_pic_buffering) + 1 + 3;
+    assert!(decodes_within(&stream, pictures * one));
+    assert!(!decodes_within(&stream, pictures * one - 1));
+    assert!(decodes_within(&stream, deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET));
+}
diff --git a/crates/vp9/src/decoder.rs b/crates/vp9/src/decoder.rs
index bd9cd1a6..28e9d6d2 100644
--- a/crates/vp9/src/decoder.rs
+++ b/crates/vp9/src/decoder.rs
@@ -73,6 +73,8 @@ pub struct Decoder {
     jobs: VecDeque<std::thread::JoinHandle<()>>,
     #[cfg(feature = "threads")]
     pool: Option<rayon::ThreadPool>,
+    /// Bytes the picture store may take ([`deckcraft_bitstream::budget`]).
+    memory_budget: u64,
 }
 
 impl Default for Decoder {
@@ -104,6 +106,11 @@ impl Decoder {
         Self::with_threads(default_threads())
     }
 
+    /// Cap the bytes of decoded pictures (references, current, in flight) this decoder may hold.
+    pub fn set_memory_budget(&mut self, bytes: u64) {
+        self.memory_budget = bytes;
+    }
+
     /// A decoder using up to `threads` worker threads (1 = decode on the calling thread, and
     /// every picture is returned by the `decode` call that completes it).
     pub fn with_threads(threads: usize) -> Self {
@@ -122,6 +129,7 @@ impl Decoder {
             last_show_frame: false,
             stats: DecodeStats::default(),
             threads: threads.max(1),
+            memory_budget: deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET,
             bufs: Arc::default(),
             draft: false,
             pending: VecDeque::new(),
@@ -256,6 +264,13 @@ impl Decoder {
             return Ok(());
         }
         ensure!(h.width <= 16384 && h.height <= 16384, "frame size {}x{} too large", h.width, h.height);
+        // Eight reference slots, the new frame and those still decoding, on the 64-sample grid.
+        ensure!(
+            store_fits(h.width, h.height, &h.color, 8 + 1 + self.threads + 2, self.memory_budget),
+            "frame size {}x{} exceeds the decoder memory budget",
+            h.width,
+            h.height
+        );
         let (mi_rows, mi_cols) = (h.mi_rows as usize, h.mi_cols as usize);
         // compute_image_size semantics (7.2.6).
         let size = (h.width, h.height);
@@ -760,3 +775,41 @@ fn picture_of(f: &Frame, pts: i64, draft: bool) -> Picture {
     }
     b.finish()
 }
+
+/// Whether `pictures` frames of `width` x `height` (on the 64-sample superblock grid) fit in
+/// `budget` bytes.
+fn store_fits(width: u32, height: u32, color: &crate::header::ColorConfig, pictures: usize, budget: u64) -> bool {
+    let shape = deckcraft_bitstream::budget::PictureShape {
+        width: u64::from(width).div_ceil(64) * 64,
+        height: u64::from(height).div_ceil(64) * 64,
+        shift_x: u32::from(color.subsampling_x),
+        shift_y: u32::from(color.subsampling_y),
+        chroma_planes: 2,
+        bytes_per_sample: 2,
+    };
+    shape.fits(pictures as u64, budget)
+}
+
+#[cfg(test)]
+mod budget_tests {
+    use super::*;
+    use deckcraft_bitstream::budget::DECODE_MEMORY_BUDGET;
+
+    fn c420() -> crate::header::ColorConfig {
+        crate::header::ColorConfig { subsampling_x: true, subsampling_y: true, ..Default::default() }
+    }
+
+    #[test]
+    fn the_axis_maximum_is_over_budget_and_4k_is_not() {
+        assert!(!store_fits(16384, 16384, &c420(), 8 + 1 + 1 + 2, DECODE_MEMORY_BUDGET));
+        assert!(store_fits(3840, 2160, &c420(), 8 + 1 + 8 + 2, DECODE_MEMORY_BUDGET));
+    }
+
+    #[test]
+    fn exact_budget_boundary_and_reference_count() {
+        let one = (64 * 64 + 2 * 32 * 32) * 2;
+        assert!(store_fits(10, 10, &c420(), 11, 11 * one));
+        assert!(!store_fits(10, 10, &c420(), 11, 11 * one - 1));
+        assert!(!store_fits(10, 10, &c420(), 12, 11 * one));
+    }
+}

From 7d23e4670b9bb68568111f18bd102680b8472246 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:01:43 +0300
Subject: [PATCH 134/376] Charts: pie and doughnut data labels use the number
 format (#324)

Pie and doughnut data labels still went through fmt_num, which rounded
anything non-integral to one decimal (999.99 drew as "1000.0"). They now
use Chart::data_label like the other label paths (series format, else
axis format, else General), and fmt_num is gone.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/model/src/chart.rs  | 18 ++++++++++++++++++
 crates/render/src/chart.rs |  6 +-----
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index aebee497..a5aa9cff 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -462,6 +462,24 @@ mod tests {
         }
     }
 
+    #[test]
+    fn general_labels_keep_every_digit_the_data_has() {
+        // #324: labels were rounded to one decimal ("100000.0" for 99999.99).
+        for kind in [ChartType::Column, ChartType::Pie, ChartType::Doughnut, ChartType::Line, ChartType::Scatter] {
+            let c = Chart::sample(kind);
+            let s = &c.series[0];
+            for (v, want) in
+                [(1220.82, "1220.82"), (99999.99, "99999.99"), (1500.05, "1500.05"), (1500.0, "1500"), (1234.567, "1234.567"), (999.99, "999.99")]
+            {
+                assert_eq!(c.data_label(s, v), want, "{kind:?}");
+            }
+        }
+        // Small ranges keep distinct value-axis ticks (0.123 used to give 0, 0.0, 0.1, 0.1…).
+        let c = Chart::sample(ChartType::Column);
+        let ticks: Vec<String> = (0..=5).map(|i| c.axis_label(false, f64::from(i) * 0.025)).collect();
+        assert_eq!(ticks, ["0", "0.025", "0.05", "0.075", "0.1", "0.125"]);
+    }
+
     #[test]
     fn axis_labels_use_the_format_and_language() {
         let mut c = Chart::sample(ChartType::Column);
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..ae2226f1 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -82,10 +82,6 @@ fn label(ctx: &mut RenderContext, rctx: &Ctx, m: Affine, text: &str, r: Rect, si
     crate::draw_text(ctx, rctx, &tmp, &body, r, m, &deckcraft_text::NoFields, None);
 }
 
-fn fmt_num(v: f64) -> String {
-    if (v - v.round()).abs() < 1e-9 { format!("{}", v.round() as i64) } else { format!("{v:.1}") }
-}
-
 /// Where the legend goes for `c:legendPos`, and the plot area left over.
 /// `size` is the legend block (width, height); the result is its top-left corner and the plot area.
 /// `r` (also the OOXML default and the fallback for unknown values) and `l` are vertical stacks centred
@@ -224,7 +220,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                     ctx,
                     rctx,
                     m,
-                    &fmt_num(*v),
+                    &c.data_label(s, *v),
                     Rect::new(lp.x - 30.0, lp.y - 10.0, lp.x + 30.0, lp.y + 10.0),
                     base,
                     Align::Center,

From c7a4930c4c5a648c6630f1338f7cc8fbc7d39062 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:08:47 +0300
Subject: [PATCH 135/376] UI: open presentations in the background with a
 progress window (#350)

Opening from the file picker or the Backstage recent list read and parsed
the file on the UI thread, so a large PPTX froze the window. The read now
runs on a thread (engine: read_presentation_file / add_presentation_file),
and a modal shows the file name, elapsed time and Cancel; Escape cancels
too. A cancelled read is dropped when it finishes. Scripted opens (control,
MCP, CLI) and the web build stay synchronous.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/file.rs         |  29 +++-
 crates/ui-egui/src/backstage.rs       |   6 +-
 crates/ui-egui/src/backstage_tests.rs |   9 ++
 crates/ui-egui/src/lib.rs             |  15 +-
 crates/ui-egui/src/opening.rs         | 195 ++++++++++++++++++++++++++
 5 files changed, 245 insertions(+), 9 deletions(-)
 create mode 100644 crates/ui-egui/src/opening.rs

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..970c5ef3 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -94,13 +94,36 @@ pub fn add_opened(s: &mut Session, name: &str, path: Option<String>, p: Presenta
     s.add_document(st)
 }
 
+/// A presentation read from disk, not yet added to a session: [`read_presentation_file`] needs no
+/// session, so a host can run it on a background thread and add the result with
+/// [`add_presentation_file`].
+#[derive(Debug)]
+pub struct LoadedFile {
+    pub path: String,
+    pub doc: Presentation,
+    /// A native or PPTX file (saving goes back to it); an outline import has no file to save to.
+    pub native: bool,
+}
+
+/// Read and parse the presentation at `path`.
 #[cfg(not(target_arch = "wasm32"))]
-fn open(s: &mut Session, p: &Value) -> Result<Value> {
-    let path = str_param(p, "path").ok_or_else(|| bad("file.open", "missing `path`"))?;
+pub fn read_presentation_file(path: &str) -> Result<LoadedFile> {
     let bytes = std::fs::read(path).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
     let doc = open_presentation(path, &bytes)?;
     let native = deckcraft_format::sniff(&bytes) || deckcraft_pptx::sniff(&bytes);
-    let i = add_opened(s, path, native.then(|| path.to_string()), doc);
+    Ok(LoadedFile { path: path.to_string(), doc, native })
+}
+
+/// Add a presentation read by [`read_presentation_file`] as the active document.
+pub fn add_presentation_file(s: &mut Session, f: LoadedFile) -> usize {
+    let LoadedFile { path, doc, native } = f;
+    add_opened(s, &path, native.then(|| path.clone()), doc)
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+fn open(s: &mut Session, p: &Value) -> Result<Value> {
+    let path = str_param(p, "path").ok_or_else(|| bad("file.open", "missing `path`"))?;
+    let i = add_presentation_file(s, read_presentation_file(path)?);
     let st = s.doc()?;
     Ok(json!({"document": i, "slides": st.doc.slides.len(), "missingFonts": st.missing_fonts}))
 }
diff --git a/crates/ui-egui/src/backstage.rs b/crates/ui-egui/src/backstage.rs
index f1d0fde3..ca4e06bb 100644
--- a/crates/ui-egui/src/backstage.rs
+++ b/crates/ui-egui/src/backstage.rs
@@ -568,10 +568,8 @@ fn recent_list(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize) {
         icons::paint(p, Rect::from_center_size(pos2(rect.left() + 20.0, rect.center().y), vec2(22.0, 22.0)), Icon::Slide, t.text, false);
         p.text(pos2(rect.left() + 44.0, rect.center().y - 8.0), Align2::LEFT_CENTER, &name, theme::font(13.0), t.text);
         p.text(pos2(rect.left() + 44.0, rect.center().y + 9.0), Align2::LEFT_CENTER, &folder, theme::font(11.0), t.text_dim);
-        if resp.on_hover_text(&path).clicked()
-            && let Err(e) = app.open_path(&path)
-        {
-            app.set_status(e);
+        if resp.on_hover_text(&path).clicked() {
+            app.open_path_in_background(&path);
         }
     }
 }
diff --git a/crates/ui-egui/src/backstage_tests.rs b/crates/ui-egui/src/backstage_tests.rs
index 115d782f..a0f07c87 100644
--- a/crates/ui-egui/src/backstage_tests.rs
+++ b/crates/ui-egui/src/backstage_tests.rs
@@ -217,6 +217,15 @@ fn open_lists_recent_files_and_opens_one() {
     h.run_steps(2);
     assert!(h.query_by_label("Other.pptx").is_none(), "the search box filters by name");
     h.get_by_label("Quarterly review.pptx").click();
+    h.run_steps(1);
+    // The file is read in the background (#350); its progress window shows meanwhile.
+    for _ in 0..300 {
+        if h.state().opening.is_none() {
+            break;
+        }
+        std::thread::sleep(std::time::Duration::from_millis(10));
+        h.run_steps(1);
+    }
     h.run_steps(3);
     assert_eq!(h.state().session.documents().len(), 2);
     assert_eq!(h.state().session.active().unwrap().path.as_deref(), Some(path.as_str()));
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..9334aced 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -15,6 +15,7 @@ pub mod fillui;
 pub mod icons;
 pub mod media;
 pub mod menus;
+pub mod opening;
 pub mod panes;
 pub mod ribbon;
 pub mod selpane;
@@ -188,6 +189,8 @@ pub struct SlideApp {
     /// Audio/video playback (editor control bar, slide show, `media.*` commands).
     pub media: media::MediaHost,
     pub status: Option<(String, f64)>,
+    /// A presentation being read in the background, with its progress window ([`opening`]).
+    pub opening: Option<opening::Opening>,
     /// A brief notice over the bottom of the window (missing fonts on opening a file).
     pub toast: Option<toast::Toast>,
     /// Documents (by uid) whose missing fonts have been mentioned.
@@ -242,6 +245,7 @@ impl SlideApp {
             show: None,
             media: media::MediaHost::new(audio_out),
             status: None,
+            opening: None,
             toast: None,
             fonts_noted: Default::default(),
             perf: Perf { frame_ms: 0.0, render_ms: 0.0, fps: 0.0 },
@@ -564,7 +568,7 @@ impl SlideApp {
     fn pick_and_open(&mut self) {
         if let Some(pick) = self.services.pick_open.as_mut() {
             if let Some(path) = pick("open") {
-                let _ = self.open_path(&path);
+                self.open_path_in_background(&path);
             }
         } else if let Some(f) = self.services.open_async.as_mut() {
             f("open");
@@ -573,11 +577,16 @@ impl SlideApp {
 
     pub fn open_path(&mut self, path: &str) -> Result<(), String> {
         self.session.execute("file.open", &json!({"path": path})).map_err(|e| e.to_string())?;
+        self.note_recent(path);
+        Ok(())
+    }
+
+    /// A presentation was opened from `path`: first in the recent list, shown in Normal view.
+    pub(crate) fn note_recent(&mut self, path: &str) {
         self.ui.recent.retain(|p| p != path);
         self.ui.recent.insert(0, path.to_string());
         self.ui.recent.truncate(12);
         self.ui.view = ViewMode::Normal;
-        Ok(())
     }
 
     fn pick_and_insert(&mut self, purpose: &str, cmd: &str) {
@@ -741,6 +750,7 @@ impl SlideApp {
         }
         self.last_time = now;
         self.drain_control(ctx);
+        self.poll_opening();
         if self.fonts_ready {
             self.drain_inbox();
         }
@@ -935,6 +945,7 @@ impl SlideApp {
         let t0 = now_ms();
         let t = theme::Tokens::get(&ctx);
         self.tick_media(&ctx);
+        self.opening_ui(&ctx);
         if self.show.is_some() {
             show::ui(self, ui);
             self.perf.frame_ms = now_ms() - t0;
diff --git a/crates/ui-egui/src/opening.rs b/crates/ui-egui/src/opening.rs
new file mode 100644
index 00000000..4c4dc45b
--- /dev/null
+++ b/crates/ui-egui/src/opening.rs
@@ -0,0 +1,195 @@
+//! Opening a presentation in the background (#350): reading and parsing a large PPTX no longer
+//! freezes the window. A modal shows the file being opened and the time so far, and Cancel (or
+//! Escape) gives the window back at once; the abandoned read finishes on its thread and is dropped.
+
+use crate::SlideApp;
+use deckcraft_engine::cmd::file::LoadedFile;
+use std::sync::mpsc::{Receiver, TryRecvError};
+
+/// A presentation being read on a background thread.
+pub struct Opening {
+    pub path: String,
+    pub started_ms: f64,
+    rx: Receiver<Result<LoadedFile, String>>,
+}
+
+impl Opening {
+    /// The file name shown in the window.
+    pub fn name(&self) -> String {
+        std::path::Path::new(&self.path).file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| self.path.clone())
+    }
+}
+
+impl SlideApp {
+    /// Open `path` without blocking the UI: the file is read on a thread and the progress window
+    /// shows until it arrives. Without threads (the web build) it opens at once.
+    pub fn open_path_in_background(&mut self, path: &str) {
+        if let Some(o) = &self.opening {
+            let name = o.name();
+            self.set_status(format!("Still opening {name}"));
+            return;
+        }
+        #[cfg(target_arch = "wasm32")]
+        {
+            if let Err(e) = self.open_path(path) {
+                self.set_status(e);
+            }
+        }
+        #[cfg(not(target_arch = "wasm32"))]
+        {
+            let (tx, rx) = std::sync::mpsc::channel();
+            let p = path.to_string();
+            let spawned = std::thread::Builder::new().name("deckcraft-open".into()).spawn(move || {
+                let r = deckcraft_engine::cmd::file::read_presentation_file(&p).map_err(|e| e.to_string());
+                let _ = tx.send(r);
+            });
+            match spawned {
+                Ok(_) => self.opening = Some(Opening { path: path.to_string(), started_ms: crate::now_ms(), rx }),
+                Err(_) => {
+                    if let Err(e) = self.open_path(path) {
+                        self.set_status(e);
+                    }
+                }
+            }
+        }
+    }
+
+    /// Stop waiting for the file being opened; the presentation stays as it is.
+    pub fn cancel_opening(&mut self) {
+        if let Some(o) = self.opening.take() {
+            self.set_status(format!("Stopped opening {}", o.name()));
+        }
+    }
+
+    /// Take the background read's result when it has arrived.
+    pub(crate) fn poll_opening(&mut self) {
+        let Some(o) = &self.opening else { return };
+        let r = match o.rx.try_recv() {
+            Ok(r) => r,
+            Err(TryRecvError::Empty) => return,
+            Err(TryRecvError::Disconnected) => Err(format!("{}: reading the file stopped unexpectedly", o.path)),
+        };
+        let Some(o) = self.opening.take() else { return };
+        match r {
+            Ok(f) => {
+                deckcraft_engine::cmd::file::add_presentation_file(&mut self.session, f);
+                self.note_recent(&o.path);
+            }
+            Err(e) => self.set_status(e),
+        }
+    }
+
+    /// The progress window over everything while a file opens.
+    pub(crate) fn opening_ui(&mut self, ctx: &egui::Context) {
+        let Some(o) = &self.opening else { return };
+        let name = o.name();
+        let secs = ((crate::now_ms() - o.started_ms) / 1000.0).max(0.0);
+        let mut cancel = false;
+        egui::Modal::new(egui::Id::new("deckcraft-opening")).show(ctx, |ui| {
+            ui.set_width(320.0);
+            ui.horizontal(|ui| {
+                ui.add(egui::Spinner::new().size(18.0));
+                ui.label(format!("Opening {name}…"));
+            });
+            ui.add_space(6.0);
+            ui.weak(format!("Reading the file: {secs:.0} s"));
+            ui.add_space(6.0);
+            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                cancel = ui.button("Cancel").clicked();
+            });
+        });
+        if cancel || ctx.input_mut(|i| i.consume_key(egui::Modifiers::NONE, egui::Key::Escape)) {
+            self.cancel_opening();
+        }
+        ctx.request_repaint_after(std::time::Duration::from_millis(100));
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used)]
+
+    use super::*;
+    use deckcraft_engine::Session;
+
+    fn saved_deck(name: &str, slides: usize) -> String {
+        let mut s = Session::with_new();
+        for _ in 1..slides {
+            s.execute("slide.new", &serde_json::json!({})).unwrap();
+        }
+        let path = std::env::temp_dir().join(format!("deckcraft-opening-{}-{name}.deckcraft", std::process::id()));
+        let path = path.to_string_lossy().to_string();
+        s.execute("file.saveAs", &serde_json::json!({"path": path})).unwrap();
+        path
+    }
+
+    fn wait(app: &mut SlideApp) {
+        for _ in 0..500 {
+            app.poll_opening();
+            if app.opening.is_none() {
+                return;
+            }
+            std::thread::sleep(std::time::Duration::from_millis(10));
+        }
+        panic!("opening did not finish");
+    }
+
+    #[test]
+    fn opens_in_the_background_and_adds_the_document() {
+        let path = saved_deck("ok", 3);
+        let mut app = SlideApp::new(Session::new(), crate::Services::default());
+        app.open_path_in_background(&path);
+        assert!(app.opening.is_some(), "the read runs on a thread");
+        wait(&mut app);
+        assert_eq!(app.session.documents().len(), 1);
+        assert_eq!(app.session.active().unwrap().doc.slides.len(), 3);
+        assert_eq!(app.ui.recent.first(), Some(&path));
+        std::fs::remove_file(&path).ok();
+    }
+
+    #[test]
+    fn cancel_drops_the_result() {
+        let path = saved_deck("cancel", 2);
+        let mut app = SlideApp::new(Session::with_new(), crate::Services::default());
+        app.open_path_in_background(&path);
+        app.cancel_opening();
+        assert!(app.opening.is_none());
+        std::thread::sleep(std::time::Duration::from_millis(200));
+        app.poll_opening();
+        assert_eq!(app.session.documents().len(), 1, "nothing is added after Cancel");
+        std::fs::remove_file(&path).ok();
+    }
+
+    #[test]
+    fn errors_show_in_the_status_bar_and_a_second_open_waits() {
+        let mut app = SlideApp::new(Session::new(), crate::Services::default());
+        app.open_path_in_background("/nonexistent/deckcraft/missing.pptx");
+        app.open_path_in_background("/nonexistent/deckcraft/other.pptx");
+        assert!(app.status.as_ref().is_some_and(|(m, _)| m.starts_with("Still opening missing.pptx")));
+        wait(&mut app);
+        assert!(app.session.documents().is_empty());
+        assert!(app.status.as_ref().is_some_and(|(m, _)| m.contains("missing.pptx")), "{:?}", app.status);
+    }
+
+    #[test]
+    fn the_progress_window_shows_and_cancel_closes_it() {
+        use egui_kittest::kittest::Queryable;
+        let mut app = SlideApp::new(Session::with_new(), crate::Services::default());
+        // A read that never answers: the window stays until Cancel.
+        let (_tx, rx) = std::sync::mpsc::channel();
+        app.opening = Some(Opening { path: "/decks/Big deck.pptx".into(), started_ms: crate::now_ms(), rx });
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1000.0, 700.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            app,
+        );
+        harness.run_steps(3);
+        harness.get_by_label("Opening Big deck.pptx…");
+        harness.get_by_label("Cancel").click();
+        harness.run_steps(2);
+        assert!(harness.state().opening.is_none());
+        assert_eq!(harness.state().session.documents().len(), 1);
+    }
+}

From ede2ca69b630d3be9ebdfac6301c8ec933bd6923 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:10:59 +0300
Subject: [PATCH 136/376] Designer: layout ideas that rearrange the current
 slide (#314)

Design Ideas showed the current slide once per built-in theme, and picking
one ran design.theme on the whole presentation; with a large picture every
idea looked the same. The pane also re-rendered eight slides every frame.

- New commands design.ideas (query) and design.applyIdea {id, slide?}
  (cmd/ideas.rs). A slide with a picture gets full-bleed with the title on a
  band, picture left or right with the text beside it, and a framed picture;
  a text slide gets a title column, a centred title and a title at the foot.
  An idea moves the slide's own shapes, crops the picture to cover its new
  box, sends it to the back, and changes only that slide (one undo step).
- The pane shows the layout ideas first, then the themes under a "whole
  presentation" heading, and caches the thumbnails until the deck revision,
  slide or pane width changes.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/ideas.rs | 325 +++++++++++++++++++++++++++++++++
 crates/engine/src/cmd/mod.rs   |   2 +
 crates/ui-egui/src/panes.rs    |  82 +++++++--
 3 files changed, 391 insertions(+), 18 deletions(-)
 create mode 100644 crates/engine/src/cmd/ideas.rs

diff --git a/crates/engine/src/cmd/ideas.rs b/crates/engine/src/cmd/ideas.rs
new file mode 100644
index 00000000..45676754
--- /dev/null
+++ b/crates/engine/src/cmd/ideas.rs
@@ -0,0 +1,325 @@
+//! Design Ideas: arrangements of what is on the current slide (picture full-bleed with the title
+//! on a band, picture on one half, a framed picture, text-only layouts). An idea moves and
+//! resizes the slide's own shapes and crops pictures to their new box; it changes only that
+//! slide. Everything is computed here, offline.
+
+use deckcraft_geom::Xfrm;
+use deckcraft_model::{Fill, Presentation, Rgba, Shape, ShapeKind};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Selection, Session};
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![
+        cmd!(query "design.ideas", "Design Ideas", [], None, "{slide?} → [{id, label}] ideas for the slide", has_slide, ideas_cmd),
+        cmd!("design.applyIdea", "Apply Design Idea", ["Home", "Designer"], None, "{id, slide?}", has_slide, apply_cmd),
+    ]
+}
+
+/// An idea: id and label.
+pub type Idea = (&'static str, &'static str);
+
+const PICTURE_IDEAS: [Idea; 4] = [
+    ("fullBleed", "Full-bleed picture, title on a band"),
+    ("pictureLeft", "Picture left, text right"),
+    ("pictureRight", "Picture right, text left"),
+    ("framed", "Framed picture beside the title"),
+];
+const TEXT_IDEAS: [Idea; 3] =
+    [("titleColumn", "Title column beside the text"), ("centred", "Centred title over the text"), ("titleBottom", "Text above, title at the foot")];
+
+/// The roles of a slide's top-level shapes, by index.
+struct Roles {
+    title: Option<usize>,
+    picture: Option<usize>,
+    text: Vec<usize>,
+}
+
+fn roles(shapes: &[Shape]) -> Roles {
+    let mut r = Roles { title: None, picture: None, text: vec![] };
+    for (i, s) in shapes.iter().enumerate() {
+        if s.hidden {
+            continue;
+        }
+        if s.ph.as_ref().is_some_and(|p| p.kind.is_title()) && r.title.is_none() {
+            r.title = Some(i);
+        } else if matches!(s.kind, ShapeKind::Picture { .. }) {
+            // The largest picture leads.
+            let area = |j: usize| shapes.get(j).and_then(|s| s.xfrm).map(|x| x.w * x.h).unwrap_or(0.0);
+            if r.picture.is_none_or(|p| area(i) > area(p)) {
+                r.picture = Some(i);
+            }
+        } else if s.text.as_ref().is_some_and(|t| !t.text().trim().is_empty()) {
+            r.text.push(i);
+        }
+    }
+    r
+}
+
+/// The ideas for slide `index` (none when it has nothing to arrange).
+pub fn ideas_for(doc: &Presentation, index: usize) -> Vec<Idea> {
+    let Some(slide) = doc.slides.get(index) else { return vec![] };
+    let r = roles(&slide.shapes);
+    if r.picture.is_some() {
+        PICTURE_IDEAS.to_vec()
+    } else if r.title.is_some() && !r.text.is_empty() {
+        TEXT_IDEAS.to_vec()
+    } else {
+        vec![]
+    }
+}
+
+/// Crop a picture whose source has aspect `src` (w/h) to fill a box of aspect `dst`, centred.
+fn cover_crop(src: f64, dst: f64) -> [f64; 4] {
+    if !(src.is_finite() && dst.is_finite() && src > 0.0 && dst > 0.0) {
+        return [0.0; 4];
+    }
+    if src > dst {
+        let cut = (1.0 - dst / src) / 2.0;
+        [cut, 0.0, cut, 0.0]
+    } else {
+        let cut = (1.0 - src / dst) / 2.0;
+        [0.0, cut, 0.0, cut]
+    }
+}
+
+/// Apply idea `id` to slide `index` of `doc` (`sel` resolves inherited placeholder boxes).
+pub fn apply_idea(doc: &mut Presentation, sel: &Selection, index: usize, id: &str) -> Result<()> {
+    if !ideas_for(doc, index).iter().any(|i| i.0 == id) {
+        return Err(bad("design.applyIdea", format!("no idea `{id}` for this slide (see design.ideas)")));
+    }
+    let (sw, sh) = (doc.slide_size.width.max(1.0), doc.slide_size.height.max(1.0));
+    let sel = Selection { slide: index, ..sel.clone() };
+    let shapes = doc.slides.get(index).map(|s| s.shapes.clone()).ok_or_else(|| bad("design.applyIdea", "no slide"))?;
+    let r = roles(&shapes);
+    let boxes: Vec<Xfrm> = shapes.iter().map(|s| xfrm_of(doc, &sel, s)).collect();
+    let m = sw.min(sh) * 0.06;
+    let mut place: Vec<(usize, Xfrm)> = vec![];
+    // Text shapes stacked in a box.
+    let stack = |b: Xfrm, out: &mut Vec<(usize, Xfrm)>| {
+        let n = r.text.len().max(1) as f64;
+        let gap = m * 0.4;
+        let h = ((b.h - gap * (n - 1.0)) / n).max(1.0);
+        for (k, i) in r.text.iter().enumerate() {
+            out.push((*i, Xfrm::new(b.x, b.y + k as f64 * (h + gap), b.w, h)));
+        }
+    };
+    let mut band = false;
+    match id {
+        "fullBleed" => {
+            if let Some(p) = r.picture {
+                place.push((p, Xfrm::new(0.0, 0.0, sw, sh)));
+            }
+            if let Some(t) = r.title {
+                place.push((t, Xfrm::new(m, sh * 0.68, sw - 2.0 * m, sh * 0.2)));
+                band = true;
+            }
+            stack(Xfrm::new(m, sh * 0.06, sw * 0.45, sh * 0.5), &mut place);
+        }
+        "pictureLeft" | "pictureRight" => {
+            let left = id == "pictureLeft";
+            let half = sw * 0.5;
+            let (px, tx) = if left { (0.0, half + m) } else { (half, m) };
+            if let Some(p) = r.picture {
+                place.push((p, Xfrm::new(px, 0.0, half, sh)));
+            }
+            let tw = half - 2.0 * m;
+            if let Some(t) = r.title {
+                place.push((t, Xfrm::new(tx, m, tw, sh * 0.24)));
+            }
+            stack(Xfrm::new(tx, m + sh * 0.28, tw, sh - 2.0 * m - sh * 0.28), &mut place);
+        }
+        "framed" => {
+            if let Some(p) = r.picture {
+                place.push((p, Xfrm::new(sw * 0.42, m * 1.5, sw * 0.58 - m * 1.5, sh - 3.0 * m)));
+            }
+            let tw = sw * 0.42 - 2.0 * m;
+            if let Some(t) = r.title {
+                place.push((t, Xfrm::new(m, m * 1.5, tw, sh * 0.3)));
+            }
+            stack(Xfrm::new(m, m * 1.5 + sh * 0.34, tw, sh - 3.0 * m - sh * 0.34), &mut place);
+        }
+        "titleColumn" => {
+            if let Some(t) = r.title {
+                place.push((t, Xfrm::new(m, m, sw * 0.32, sh - 2.0 * m)));
+            }
+            stack(Xfrm::new(sw * 0.36, m, sw * 0.64 - m, sh - 2.0 * m), &mut place);
+        }
+        "centred" => {
+            if let Some(t) = r.title {
+                place.push((t, Xfrm::new(sw * 0.1, m, sw * 0.8, sh * 0.26)));
+            }
+            stack(Xfrm::new(sw * 0.18, m + sh * 0.3, sw * 0.64, sh - 2.0 * m - sh * 0.3), &mut place);
+        }
+        "titleBottom" => {
+            stack(Xfrm::new(m, m, sw - 2.0 * m, sh * 0.62), &mut place);
+            if let Some(t) = r.title {
+                place.push((t, Xfrm::new(m, sh * 0.72, sw - 2.0 * m, sh * 0.2)));
+            }
+        }
+        _ => return Err(bad("design.applyIdea", format!("no idea `{id}`"))),
+    }
+    let slide = doc.slides.get_mut(index).ok_or_else(|| bad("design.applyIdea", "no slide"))?;
+    let slide = std::sync::Arc::make_mut(slide);
+    for (i, x) in place {
+        let (Some(s), Some(old)) = (slide.shapes.get_mut(i), boxes.get(i)) else { continue };
+        if let ShapeKind::Picture { fill } = &mut s.kind {
+            // The source's aspect, from the current box and crop.
+            let c = fill.crop;
+            let (fw, fh) = ((1.0 - c[0] - c[2]).max(0.01), (1.0 - c[1] - c[3]).max(0.01));
+            let src = (old.w / fw) / (old.h / fh).max(1e-6);
+            fill.crop = cover_crop(src, x.w / x.h.max(1e-6));
+        }
+        s.xfrm = Some(Xfrm { rot: 0.0, ..x });
+    }
+    // The picture goes to the back, so text over it stays readable.
+    if let Some(p) = r.picture
+        && p < slide.shapes.len()
+    {
+        let pic = slide.shapes.remove(p);
+        slide.shapes.insert(0, pic);
+    }
+    if band && let Some(t) = slide.shapes.iter_mut().find(|s| s.ph.as_ref().is_some_and(|p| p.kind.is_title())) {
+        t.fill = Some(Fill::solid(deckcraft_model::ColorRef::rgb(Rgba::rgba(255, 255, 255, 220))));
+    }
+    Ok(())
+}
+
+fn ideas_cmd(s: &mut Session, p: &Value) -> Result<Value> {
+    let st = s.doc()?;
+    let i = usize_param(p, "slide").unwrap_or(st.selection.slide);
+    Ok(json!(ideas_for(&st.doc, i).iter().map(|(id, label)| json!({"id": id, "label": label})).collect::<Vec<_>>()))
+}
+
+fn apply_cmd(s: &mut Session, p: &Value) -> Result<Value> {
+    let id = str_param(p, "id").ok_or_else(|| bad("design.applyIdea", "missing `id`"))?.to_string();
+    let slide = usize_param(p, "slide");
+    s.edit(|doc, sel| {
+        let i = slide.unwrap_or(sel.slide);
+        apply_idea(doc, sel, i, &id)?;
+        Ok(json!({"slide": i, "id": id}))
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used)]
+
+    use std::sync::Arc;
+
+    use deckcraft_model::style::PictureFill;
+    use deckcraft_model::{PhType, Placeholder, ShapeId};
+
+    use super::*;
+
+    fn deck(picture: bool) -> Session {
+        let mut s = Session::with_new();
+        let st = s.doc_mut().unwrap();
+        let doc = Arc::make_mut(&mut st.doc);
+        let slide = Arc::make_mut(&mut doc.slides[0]);
+        slide.shapes.clear();
+        let title = Shape {
+            id: ShapeId(500),
+            ph: Some(Placeholder { kind: PhType::Title, ..Default::default() }),
+            xfrm: Some(Xfrm::new(50.0, 30.0, 860.0, 90.0)),
+            text: Some(deckcraft_model::text::TextBody::from_text("Harbour at dawn")),
+            ..Default::default()
+        };
+        let body = Shape {
+            id: ShapeId(501),
+            xfrm: Some(Xfrm::new(50.0, 140.0, 860.0, 350.0)),
+            text: Some(deckcraft_model::text::TextBody::from_text("one\ntwo")),
+            ..Default::default()
+        };
+        slide.shapes.push(title);
+        slide.shapes.push(body);
+        if picture {
+            // A 2:1 picture covering most of the slide, over the title.
+            let pic = Shape {
+                id: ShapeId(502),
+                kind: ShapeKind::Picture { fill: PictureFill::default() },
+                xfrm: Some(Xfrm::new(0.0, 0.0, 900.0, 450.0)),
+                ..Default::default()
+            };
+            slide.shapes.push(pic);
+        }
+        s
+    }
+
+    fn shape(s: &Session, id: u32) -> Shape {
+        s.doc().unwrap().doc.slides[0].shapes.iter().find(|x| x.id == ShapeId(id)).cloned().unwrap()
+    }
+
+    fn overlaps(a: Xfrm, b: Xfrm) -> bool {
+        a.x < b.x + b.w - 0.5 && b.x < a.x + a.w - 0.5 && a.y < b.y + b.h - 0.5 && b.y < a.y + a.h - 0.5
+    }
+
+    #[test]
+    fn picture_slides_get_layout_ideas_and_text_slides_get_text_ideas() {
+        let s = deck(true);
+        let ids: Vec<&str> = ideas_for(&s.doc().unwrap().doc, 0).iter().map(|i| i.0).collect();
+        assert_eq!(ids, ["fullBleed", "pictureLeft", "pictureRight", "framed"]);
+        let s = deck(false);
+        assert_eq!(ideas_for(&s.doc().unwrap().doc, 0).len(), 3);
+        assert!(ideas_for(&s.doc().unwrap().doc, 9).is_empty());
+    }
+
+    #[test]
+    fn picture_left_puts_text_beside_the_picture_cropped_to_fill() {
+        let mut s = deck(true);
+        let theme_before = s.doc().unwrap().doc.masters[0].theme.name.clone();
+        s.execute("design.applyIdea", &json!({"id": "pictureLeft"})).unwrap();
+        let (pic, title, body) = (shape(&s, 502), shape(&s, 500), shape(&s, 501));
+        let px = pic.xfrm.unwrap();
+        assert_eq!((px.x, px.y, px.w, px.h), (0.0, 0.0, 480.0, 540.0));
+        assert!(!overlaps(px, title.xfrm.unwrap()) && !overlaps(px, body.xfrm.unwrap()));
+        assert!(!overlaps(title.xfrm.unwrap(), body.xfrm.unwrap()));
+        // 2:1 source into an 8:9 box: cut equally from left and right.
+        let ShapeKind::Picture { fill } = &pic.kind else { panic!() };
+        assert!(fill.crop[0] > 0.25 && (fill.crop[0] - fill.crop[2]).abs() < 1e-9 && fill.crop[1] == 0.0, "{:?}", fill.crop);
+        // Only this slide's arrangement changed, not the theme; undo restores it.
+        assert_eq!(s.doc().unwrap().doc.masters[0].theme.name, theme_before);
+        assert_eq!(s.doc().unwrap().doc.slides[0].shapes[0].id, ShapeId(502), "picture at the back");
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(shape(&s, 502).xfrm.unwrap().w, 900.0);
+    }
+
+    #[test]
+    fn full_bleed_covers_the_slide_and_puts_the_title_on_a_band() {
+        let mut s = deck(true);
+        s.execute("design.applyIdea", &json!({"id": "fullBleed"})).unwrap();
+        let px = shape(&s, 502).xfrm.unwrap();
+        assert_eq!((px.w, px.h), (960.0, 540.0));
+        let t = shape(&s, 500);
+        assert!(t.fill.is_some());
+        assert!(t.xfrm.unwrap().y > 300.0);
+    }
+
+    #[test]
+    fn every_idea_keeps_shapes_on_the_slide_and_unknown_ideas_are_refused() {
+        for pic in [true, false] {
+            let probe = deck(pic);
+            for (id, _) in ideas_for(&probe.doc().unwrap().doc, 0) {
+                let mut s = deck(pic);
+                s.execute("design.applyIdea", &json!({"id": id})).unwrap();
+                for sh in &s.doc().unwrap().doc.slides[0].shapes {
+                    let x = sh.xfrm.unwrap();
+                    assert!(x.x >= -0.01 && x.y >= -0.01 && x.x + x.w <= 960.01 && x.y + x.h <= 540.01 && x.w > 0.0 && x.h > 0.0, "{id}: {x:?}");
+                }
+            }
+        }
+        let mut s = deck(false);
+        assert!(s.execute("design.applyIdea", &json!({"id": "fullBleed"})).is_err());
+        assert!(s.execute("design.applyIdea", &json!({"id": "nope"})).is_err());
+    }
+
+    #[test]
+    fn cover_crop_matches_the_box_aspect() {
+        let c = cover_crop(2.0, 1.0);
+        assert!((c[0] - 0.25).abs() < 1e-12 && c[1] == 0.0);
+        let c = cover_crop(1.0, 2.0);
+        assert!((c[1] - 0.25).abs() < 1e-12 && c[0] == 0.0);
+        assert_eq!(cover_crop(f64::NAN, 1.0), [0.0; 4]);
+    }
+}
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..280b163d 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -6,6 +6,7 @@ pub mod design;
 pub mod edit;
 pub mod file;
 pub mod format;
+pub mod ideas;
 pub mod insert;
 pub mod inspect;
 pub mod media;
@@ -136,6 +137,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(text::specs());
         v.extend(format::specs());
         v.extend(design::specs());
+        v.extend(ideas::specs());
         v.extend(transition::specs());
         v.extend(animation::specs());
         v.extend(table::specs());
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..3570482d 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -598,30 +598,61 @@ fn comments(app: &mut SlideApp, ui: &mut Ui) {
 }
 
 /// Design Ideas: offline suggestions — the current slide in each theme and layout variations.
+/// Rendered idea thumbnails, kept until the deck, slide or pane width changes (rendering eight
+/// slides every frame made the pane cost ~25 ms a frame).
+#[derive(Clone, Default)]
+struct IdeaThumbs {
+    key: (u64, u64, usize, u32),
+    tex: Vec<(String, egui::TextureHandle, u32, u32)>,
+}
+
 fn designer(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
-    ui.label(egui::RichText::new("Pick a look for your slides. Ideas are generated on your device.").color(t.text_dim));
+    ui.label(egui::RichText::new("Pick a design for this slide. Ideas are generated on your device.").color(t.text_dim));
     ui.add_space(6.0);
     let Some(st) = app.session.active() else { return };
     let doc = st.doc.clone();
     let idx = st.selection.slide;
+    let sel = st.selection.clone();
+    let key_doc = (st.uid, st.revision);
     let w = ui.available_width() - 8.0;
-    for th in deckcraft_model::theme::builtin_themes() {
-        let mut d = (*doc).clone();
-        if let Some(m) = d.masters.first_mut() {
-            let m = std::sync::Arc::make_mut(m);
-            m.theme = th.clone();
+    let ppp = ui.ctx().pixels_per_point();
+    let px = (w * ppp).max(16.0) as u32;
+    let ideas = deckcraft_engine::cmd::ideas::ideas_for(&doc, idx);
+    let themes = deckcraft_model::theme::builtin_themes();
+    let cache_id = egui::Id::new("design-idea-thumbs");
+    let key = (key_doc.0, key_doc.1, idx, px);
+    let mut cache: IdeaThumbs = ui.ctx().data_mut(|d| d.get_temp(cache_id)).unwrap_or_default();
+    if cache.key != key || cache.tex.is_empty() {
+        cache = IdeaThumbs { key, tex: vec![] };
+        let mut render = |name: String, d: &deckcraft_model::Presentation| {
+            let h = (px as f64 * d.slide_size.height / d.slide_size.width.max(1.0)) as u32;
+            let img = deckcraft_render::render_slide(
+                d,
+                idx,
+                &deckcraft_render::RenderOpts { scale: px as f64 / d.slide_size.width.max(1.0), size: Some((px, h)), ..Default::default() },
+            );
+            let tex = ui.ctx().load_texture(format!("idea-{name}"), crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR);
+            cache.tex.push((name, tex, px, h));
+        };
+        for (id, _) in &ideas {
+            let mut d = (*doc).clone();
+            if deckcraft_engine::cmd::ideas::apply_idea(&mut d, &sel, idx, id).is_ok() {
+                render(format!("layout:{id}"), &d);
+            }
         }
-        let ppp = ui.ctx().pixels_per_point();
-        let px = (w * ppp) as u32;
-        let h = (px as f64 * d.slide_size.height / d.slide_size.width.max(1.0)) as u32;
-        let img = deckcraft_render::render_slide(
-            &d,
-            idx,
-            &deckcraft_render::RenderOpts { scale: px as f64 / d.slide_size.width.max(1.0), size: Some((px, h)), ..Default::default() },
-        );
-        let tex = ui.ctx().load_texture(format!("idea-{}", th.name), crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR);
-        let (r, resp) = ui.allocate_exact_size(vec2(w, w * h as f32 / px.max(1) as f32), Sense::click());
+        for th in &themes {
+            let mut d = (*doc).clone();
+            if let Some(m) = d.masters.first_mut() {
+                std::sync::Arc::make_mut(m).theme = th.clone();
+            }
+            render(format!("theme:{}", th.name), &d);
+        }
+        ui.ctx().data_mut(|d| d.insert_temp(cache_id, cache.clone()));
+    }
+    let thumb = |ui: &mut Ui, name: &str, tip: &str| -> bool {
+        let Some((_, tex, tw, th)) = cache.tex.iter().find(|e| e.0 == name) else { return false };
+        let (r, resp) = ui.allocate_exact_size(vec2(w, w * *th as f32 / (*tw).max(1) as f32), Sense::click());
         ui.painter().image(tex.id(), r, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
         ui.painter().rect_stroke(
             r,
@@ -629,9 +660,24 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
             Stroke::new(if resp.hovered() { 2.5 } else { 1.0 }, if resp.hovered() { t.accent } else { t.border }),
             egui::StrokeKind::Outside,
         );
-        if resp.on_hover_text(&th.name).clicked() {
+        let clicked = resp.on_hover_text(tip).clicked();
+        ui.add_space(8.0);
+        clicked
+    };
+    if ideas.is_empty() {
+        ui.label(egui::RichText::new("Add a title with a picture or some text to get layout ideas.").color(t.text_dim));
+    }
+    for (id, label) in &ideas {
+        if thumb(ui, &format!("layout:{id}"), label) {
+            run(app, "design.applyIdea", json!({"id": id}));
+        }
+    }
+    ui.add_space(4.0);
+    ui.label(egui::RichText::new("Themes (whole presentation)").color(t.text_dim));
+    ui.add_space(4.0);
+    for th in &themes {
+        if thumb(ui, &format!("theme:{}", th.name), &th.name) {
             run(app, "design.theme", json!({"name": th.name}));
         }
-        ui.add_space(8.0);
     }
 }

From 07dd513c544ed0e40f96fd0c4ac76f2a0a48f703 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:11:38 +0300
Subject: [PATCH 137/376] Show: render the next slide in the background while
 the current one rests (#240)

Advancing rendered the new slide on the UI thread at full screen size
before anything changed on screen. While a slide rests (no animation or
transition playing) the show now renders the next slide's first frame on
a background thread; entering that slide uploads the ready image instead
of rendering, waiting for the render if it is still running. Slides with
animated GIFs and the web build keep rendering on entry.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/ui-egui/src/show.rs | 131 ++++++++++++++++++++++++++++++-------
 1 file changed, 108 insertions(+), 23 deletions(-)

diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..8e8e910f 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -27,6 +27,9 @@ pub struct Show {
     trans: Option<Transition>,
     tex: Option<(Key, TextureHandle)>,
     next_tex: Option<(usize, TextureHandle)>,
+    /// The next slide's first frame, rendered in the background while this one is shown so
+    /// advancing only uploads it (#240).
+    prefetch: Option<Prefetch>,
     blank: Option<Color32>,
     pen: bool,
     strokes: Vec<Vec<Pos2>>,
@@ -44,7 +47,7 @@ pub struct Show {
     links: Option<(usize, Vec<deckcraft_render::PlacedLink>)>,
 }
 
-#[derive(Clone, PartialEq)]
+#[derive(Clone, Debug, PartialEq)]
 struct Key {
     slide: usize,
     step: usize,
@@ -56,6 +59,74 @@ struct Key {
     gif: u64,
 }
 
+/// A slide frame being rendered on another thread: what it will be (`key`) and where it arrives.
+struct Prefetch {
+    key: Key,
+    rx: std::sync::mpsc::Receiver<egui::ColorImage>,
+}
+
+fn render_threads() -> u16 {
+    if cfg!(target_arch = "wasm32") { 0 } else { std::thread::available_parallelism().map(|n| n.get().min(8) as u16).unwrap_or(0) }
+}
+
+#[allow(clippy::too_many_arguments)]
+/// Slide `idx` at `step`, `t` seconds into it, `size` pixels, with `hidden` media hidden.
+fn render_frame(
+    doc: &Presentation,
+    idx: usize,
+    tl: Timeline,
+    step: usize,
+    t: f64,
+    size: (u32, u32),
+    hidden: Vec<ShapeId>,
+    times: &[(ShapeId, f64)],
+    threads: u16,
+) -> egui::ColorImage {
+    let f = move |id: ShapeId| {
+        let mut st = state_for(&tl, id, step, t);
+        if hidden.contains(&id) {
+            st.visible = false;
+        }
+        st
+    };
+    let img = deckcraft_render::render_slide(
+        doc,
+        idx,
+        &RenderOpts {
+            scale: size.0 as f64 / doc.slide_size.width.max(1.0),
+            size: Some(size),
+            state: Some(&f),
+            gif_times: times,
+            threads,
+            ..Default::default()
+        },
+    );
+    crate::textures::to_color_image(&img, false)
+}
+
+/// Media on slide `idx` hidden until it plays, as it is when the slide is entered.
+fn hidden_on_entry(doc: &Presentation, idx: usize) -> Vec<ShapeId> {
+    crate::media::slide_media(doc, idx).into_iter().filter(|(_, _, clip)| clip.hide_while_not_playing).map(|m| m.0).collect()
+}
+
+/// Start rendering slide `next`'s first frame on another thread. `None` on the web (no threads).
+fn start_prefetch(doc: &std::sync::Arc<Presentation>, next: usize, size: (u32, u32)) -> Option<Prefetch> {
+    if cfg!(target_arch = "wasm32") {
+        return None;
+    }
+    let hidden = hidden_on_entry(doc, next);
+    let key = Key { slide: next, step: 0, size, doc: std::sync::Arc::as_ptr(doc) as usize, hidden: hidden.clone(), gif: 0 };
+    let (tx, rx) = std::sync::mpsc::channel();
+    let doc = doc.clone();
+    // Leave a core for the UI thread.
+    let threads = render_threads().saturating_sub(1).max(1);
+    let spawned = std::thread::Builder::new().name("show-prefetch".into()).spawn(move || {
+        let tl = ShowState::timeline(&doc, next);
+        let _ = tx.send(render_frame(&doc, next, tl, 0, 0.0, size, hidden, &[], threads));
+    });
+    spawned.ok().map(|_| Prefetch { key, rx })
+}
+
 struct Transition {
     old: Option<TextureHandle>,
     /// The slide left behind (Morph matches its shapes) and the Morph frame texture.
@@ -87,6 +158,7 @@ impl Show {
             trans: None,
             tex: None,
             next_tex: None,
+            prefetch: None,
             blank: None,
             pen: false,
             strokes: vec![],
@@ -413,30 +485,18 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         let tex = if !animating && show.tex.as_ref().is_some_and(|(k, _)| *k == key) {
             show.tex.as_ref().map(|(_, t)| t.clone())
         } else {
-            let tl = show.timeline(&doc).clone();
-            let hide = hidden.clone();
-            let f = move |id: ShapeId| {
-                let mut st = state_for(&tl, id, step, t);
-                if hide.contains(&id) {
-                    st.visible = false;
+            // The frame rendered ahead of time, when it is this one (waiting for it beats starting over).
+            let ready = match show.prefetch.take() {
+                Some(p) if p.key == key && !animating => p.rx.recv().ok(),
+                _ => None,
+            };
+            let ci = match ready {
+                Some(ci) => ci,
+                None => {
+                    let tl = show.timeline(&doc).clone();
+                    render_frame(&doc, idx, tl, step, t, size, hidden.clone(), &times, render_threads())
                 }
-                st
             };
-            let threads =
-                if cfg!(target_arch = "wasm32") { 0 } else { std::thread::available_parallelism().map(|n| n.get().min(8) as u16).unwrap_or(0) };
-            let img = deckcraft_render::render_slide(
-                &doc,
-                idx,
-                &RenderOpts {
-                    scale: size.0 as f64 / doc.slide_size.width.max(1.0),
-                    size: Some(size),
-                    state: Some(&f),
-                    gif_times: &times,
-                    threads,
-                    ..Default::default()
-                },
-            );
-            let ci = crate::textures::to_color_image(&img, false);
             let tex = match show.tex.take() {
                 Some((_, mut h)) => {
                     h.set(ci, egui::TextureOptions::LINEAR);
@@ -447,6 +507,17 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             show.tex = Some((key, tex.clone()));
             Some(tex)
         };
+        // While this slide rests, render the next one's first frame (not one with GIFs, whose
+        // frame depends on when it is entered).
+        if !animating && show.trans.is_none() && !show.preview_only {
+            let next = deckcraft_anim::show_order(&doc).into_iter().find(|i| *i > idx);
+            let wanted = next.filter(|n| app.media.gifs(&doc, *n, now, &app.session.gif_paused).is_empty());
+            if let Some(n) = wanted
+                && show.prefetch.as_ref().is_none_or(|p| p.key.slide != n || p.key.size != size || p.key.doc != std::sync::Arc::as_ptr(&doc) as usize)
+            {
+                show.prefetch = start_prefetch(&doc, n, size);
+            }
+        }
         let mut drew = false;
         let morphing = show.trans.as_ref().is_some_and(|tr| tr.kind == "morph" && tr.from.is_some() && now - tr.start < tr.dur);
         let tl = if morphing { Some(show.timeline(&doc).clone()) } else { None };
@@ -867,6 +938,20 @@ mod tests {
 
     use super::*;
 
+    #[test]
+    fn the_prefetched_frame_is_the_frame_shown_on_entry() {
+        let mut s = deckcraft_engine::Session::with_new();
+        s.execute("slide.new", &json!({"title": "Second"})).unwrap();
+        let doc = s.active().unwrap().doc.clone();
+        let size = (96, 54);
+        let p = start_prefetch(&doc, 1, size).expect("prefetch starts");
+        assert_eq!(p.key, Key { slide: 1, step: 0, size, doc: std::sync::Arc::as_ptr(&doc) as usize, hidden: vec![], gif: 0 });
+        let got = p.rx.recv().expect("the frame arrives");
+        let want = render_frame(&doc, 1, ShowState::timeline(&doc, 1), 0, 0.0, size, vec![], &[], 0);
+        assert_eq!(got.size, want.size);
+        assert_eq!(got.pixels, want.pixels);
+    }
+
     #[test]
     fn a_transition_keeps_the_old_slide_in_its_own_texture() {
         // #33: the old slide's handle was cloned, so the new slide was rendered into the same

From eec67560dfa67eb7f8ceed8d3aec7be5d3a94a71 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:16:23 +0300
Subject: [PATCH 138/376] Fonts: find fonts where Linux and Flatpak keep them;
 add and rescan commands (#277)

The font menu lists every family the scan of the system font folders finds,
but on Linux the scan only looked in /usr/share/fonts, /usr/local/share/fonts,
~/.fonts and ~/.local/share/fonts. Fonts under XDG data dirs, in folders
fontconfig is configured with (NixOS, Guix, custom setups) and, inside
Flatpak, the host's fonts never showed.

- system_font_dirs adds $XDG_DATA_HOME/fonts and each $XDG_DATA_DIRS/fonts,
  Flatpak's /run/host/{fonts,local-fonts,user-fonts}, and the <dir> entries
  of /etc/fonts/fonts.conf, local.conf and conf.d; duplicates are dropped.
- font.add {data} adds a font from its bytes for the session; font.rescan
  catalogs the installed fonts again, and the font menu has a
  "Rescan Installed Fonts" item for fonts installed while DeckCraft runs.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/format.rs |  25 +++++++
 crates/engine/src/tests.rs      |  10 +++
 crates/fonts/src/fontdb.rs      | 127 ++++++++++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs    |   6 ++
 4 files changed, 168 insertions(+)

diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index c68d1242..86870206 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -13,6 +13,8 @@ use crate::{Result, Session};
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![
+        cmd!(noundo "font.add", "Add Font", [], None, "{data: base64 TTF/OTF/TTC} → {faces} added for this session", always, font_add),
+        cmd!(noundo "font.rescan", "Rescan Installed Fonts", ["Home", "Font"], None, "{} → {faces, families} (fonts installed since start-up)", always, font_rescan),
         cmd!("format.bold", "Bold", ["Home", "Font"], Some("Cmd+B"), "{on?: bool}", has_text_or_shapes, bold),
         cmd!("format.italic", "Italic", ["Home", "Font"], Some("Cmd+I"), "{on?: bool}", has_text_or_shapes, italic),
         cmd!(
@@ -682,3 +684,26 @@ fn state(s: &mut Session, _p: &Value) -> Result<Value> {
         "painter": s.painter.is_some(),
     }))
 }
+
+/// Add a font from its bytes for this session (it then shows in the font menu and draws).
+fn font_add(_s: &mut Session, p: &Value) -> Result<Value> {
+    let data = str_param(p, "data").and_then(base64_decode).ok_or_else(|| bad("font.add", "missing or invalid base64 `data`"))?;
+    if data.len() > 64 << 20 {
+        return Err(bad("font.add", "font file larger than 64 MB"));
+    }
+    let faces = deckcraft_fonts::FontDb::global().add_font(data);
+    if faces == 0 {
+        return Err(bad("font.add", "not a font DeckCraft can read (or already added)"));
+    }
+    Ok(json!({"faces": faces}))
+}
+
+/// Catalog the installed fonts again, so fonts installed while DeckCraft runs appear.
+fn font_rescan(_s: &mut Session, _p: &Value) -> Result<Value> {
+    let db = deckcraft_fonts::FontDb::global();
+    #[cfg(not(target_arch = "wasm32"))]
+    let faces = db.load_system_fonts();
+    #[cfg(target_arch = "wasm32")]
+    let faces = 0usize;
+    Ok(json!({"faces": faces, "families": db.families().len()}))
+}
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..15f4df41 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,13 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn font_add_refuses_non_fonts_and_rescan_reports_the_catalog() {
+    let mut s = session();
+    let not_font = crate::cmd::base64_encode(b"definitely not a font file");
+    assert!(s.execute("font.add", &json!({"data": not_font})).is_err());
+    assert!(s.execute("font.add", &json!({})).is_err());
+    let r = s.execute("font.rescan", &json!({})).unwrap();
+    assert!(r["families"].as_u64().unwrap() >= 1, "{r}");
+}
diff --git a/crates/fonts/src/fontdb.rs b/crates/fonts/src/fontdb.rs
index 5425c022..af04dfcb 100644
--- a/crates/fonts/src/fontdb.rs
+++ b/crates/fonts/src/fontdb.rs
@@ -488,10 +488,87 @@ pub fn system_font_dirs() -> Vec<std::path::PathBuf> {
             dirs.push(h.join(".fonts"));
             dirs.push(h.join(".local/share/fonts"));
         }
+        let env = |k: &str| std::env::var_os(k).map(|v| v.to_string_lossy().into_owned());
+        dirs.extend(xdg_font_dirs(env("XDG_DATA_HOME").as_deref(), env("XDG_DATA_DIRS").as_deref(), home.as_deref()));
+        // Inside Flatpak the host's fonts are mounted here.
+        dirs.extend(["/run/host/fonts", "/run/host/local-fonts", "/run/host/user-fonts"].map(Into::into));
+        // Folders fontconfig is configured with (NixOS, Guix, custom setups).
+        for conf in fontconfig_files() {
+            if let Ok(text) = std::fs::read_to_string(&conf) {
+                dirs.extend(fontconfig_dirs(&text, env("XDG_DATA_HOME").as_deref(), home.as_deref()));
+            }
+        }
     }
+    let mut seen = std::collections::HashSet::new();
+    dirs.retain(|d| seen.insert(d.clone()));
     dirs
 }
 
+/// `<data dir>/fonts` for `XDG_DATA_HOME` (default `~/.local/share`) and each `XDG_DATA_DIRS`
+/// entry (default `/usr/local/share:/usr/share`).
+fn xdg_font_dirs(data_home: Option<&str>, data_dirs: Option<&str>, home: Option<&std::path::Path>) -> Vec<std::path::PathBuf> {
+    let mut v = vec![];
+    match data_home.filter(|d| !d.is_empty()) {
+        Some(d) => v.push(std::path::Path::new(d).join("fonts")),
+        None => {
+            if let Some(h) = home {
+                v.push(h.join(".local/share/fonts"));
+            }
+        }
+    }
+    let dirs = data_dirs.filter(|d| !d.is_empty()).unwrap_or("/usr/local/share:/usr/share");
+    v.extend(dirs.split(':').filter(|d| d.starts_with('/')).take(64).map(|d| std::path::Path::new(d).join("fonts")));
+    v
+}
+
+/// The fontconfig configuration files: `/etc/fonts/fonts.conf` and `/etc/fonts/conf.d/*.conf`.
+fn fontconfig_files() -> Vec<std::path::PathBuf> {
+    let mut v = vec![std::path::PathBuf::from("/etc/fonts/fonts.conf"), std::path::PathBuf::from("/etc/fonts/local.conf")];
+    if let Ok(entries) = std::fs::read_dir("/etc/fonts/conf.d") {
+        let mut files: Vec<_> = entries.flatten().map(|e| e.path()).filter(|p| p.extension().is_some_and(|x| x == "conf")).collect();
+        files.sort();
+        files.truncate(512);
+        v.extend(files);
+    }
+    v
+}
+
+/// The `<dir>` folders of a fontconfig file (`prefix="xdg"` is under `XDG_DATA_HOME`, a leading
+/// `~` under home; relative and `cachedir` entries are skipped).
+fn fontconfig_dirs(text: &str, data_home: Option<&str>, home: Option<&std::path::Path>) -> Vec<std::path::PathBuf> {
+    let mut v = vec![];
+    let mut rest = text;
+    while let Some(start) = rest.find("<dir") {
+        let after = &rest[start + 4..];
+        // `<dir>` or `<dir …>`, not `<dirname>`.
+        if !(after.starts_with('>') || after.starts_with(' ')) {
+            rest = after;
+            continue;
+        }
+        let Some(gt) = after.find('>') else { break };
+        let attrs = &after[..gt];
+        let body = &after[gt + 1..];
+        let Some(end) = body.find("</dir>") else { break };
+        let path = body[..end].trim();
+        rest = &body[end..];
+        if attrs.trim_end().ends_with('/') || path.is_empty() || v.len() >= 64 {
+            continue;
+        }
+        let p = if attrs.contains("prefix=\"xdg\"") {
+            let base = data_home.filter(|d| !d.is_empty()).map(std::path::PathBuf::from).or_else(|| home.map(|h| h.join(".local/share")));
+            base.map(|b| b.join(path))
+        } else if let Some(r) = path.strip_prefix("~/") {
+            home.map(|h| h.join(r))
+        } else if path.starts_with('/') {
+            Some(std::path::PathBuf::from(path))
+        } else {
+            None
+        };
+        v.extend(p);
+    }
+    v
+}
+
 /// One face found in a font file: index, family, style and (variable fonts) the named instance's
 /// axis settings.
 type Found = (u32, String, String, Vec<([u8; 4], f32)>);
@@ -1241,3 +1318,53 @@ impl OutlinePen for FlipPen {
         self.0.close_path();
     }
 }
+
+#[cfg(test)]
+mod font_dir_tests {
+    use std::path::{Path, PathBuf};
+
+    use super::*;
+
+    #[test]
+    fn xdg_data_dirs_contribute_their_fonts_folders() {
+        let home = Path::new("/home/ann");
+        assert_eq!(
+            xdg_font_dirs(None, None, Some(home)),
+            [home.join(".local/share/fonts"), "/usr/local/share/fonts".into(), "/usr/share/fonts".into()]
+        );
+        let v = xdg_font_dirs(Some("/data/ann"), Some("/nix/profile/share:relative:/var/lib/flatpak/exports/share"), Some(home));
+        assert_eq!(v, [PathBuf::from("/data/ann/fonts"), "/nix/profile/share/fonts".into(), "/var/lib/flatpak/exports/share/fonts".into()]);
+    }
+
+    #[test]
+    fn fontconfig_dir_entries_are_read() {
+        let conf = r#"<?xml version="1.0"?>
+<fontconfig>
+  <dir>/usr/share/fonts</dir>
+  <dir prefix="xdg">fonts</dir>
+  <dir>~/.fonts</dir>
+  <dir>relative/fonts</dir>
+  <cachedir>/var/cache/fontconfig</cachedir>
+  <dirname>ignored</dirname>
+  <dir>/nix/store/abc-fonts/share/fonts</dir>
+</fontconfig>"#;
+        let home = Path::new("/home/ann");
+        let v = fontconfig_dirs(conf, None, Some(home));
+        assert_eq!(
+            v,
+            [PathBuf::from("/usr/share/fonts"), home.join(".local/share/fonts"), home.join(".fonts"), "/nix/store/abc-fonts/share/fonts".into()]
+        );
+        assert!(fontconfig_dirs("<dir>/never closed", None, Some(home)).is_empty());
+    }
+
+    #[test]
+    #[cfg(target_os = "linux")]
+    fn linux_dirs_include_flatpak_host_fonts_without_duplicates() {
+        let d = system_font_dirs();
+        assert!(d.contains(&PathBuf::from("/run/host/user-fonts")));
+        let mut u = d.clone();
+        u.sort();
+        u.dedup();
+        assert_eq!(u.len(), d.len());
+    }
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..c13c1a3d 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -437,6 +437,12 @@ fn font_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                             ui.separator();
                         }
                     }
+                    ui.separator();
+                    // Fonts installed while DeckCraft runs (e.g. into ~/.local/share/fonts).
+                    if ui.button("Rescan Installed Fonts").clicked() {
+                        run(app, "font.rescan", json!({}));
+                        ui.close();
+                    }
                 });
                 let size_text = size.map(|s| widgets::fmt_num(s, "")).unwrap_or_default();
                 dropdown(ui, "size", &size_text, 52.0, en, |ui| {

From 2a79cb76713396172ea3ec38419a0fb4587495e5 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:17:39 +0300
Subject: [PATCH 139/376] Shapes: smooth a rectangle's corners into a squircle
 (#286)

deckcraft_geom::squircle builds a rectangle outline whose corners start
curving earlier along the edge and keep a shorter circular arc, as design
tools' corner smoothing does. shape.smoothCorners turns rectangles and
rounded rectangles into that outline (custom geometry, so it round-trips
through PPTX), and Edit Shape gains a Smooth Corners slider.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/shape.rs |  42 ++++++++
 crates/engine/src/tests.rs     |  29 ++++++
 crates/geom/src/lib.rs         |   1 +
 crates/geom/src/squircle.rs    | 183 +++++++++++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs   |  44 ++++++++
 5 files changed, 299 insertions(+)
 create mode 100644 crates/geom/src/squircle.rs

diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..1b53f148 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -37,6 +37,15 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("shape.flip", "Flip", ["Shape Format", "Arrange", "Rotate"], None, "{axis: horizontal|vertical, ids?}", has_selection, flip),
         cmd!("shape.adjust", "Adjust Shape", [], None, "{index, value (file units), ids?}", has_selection, adjust),
         cmd!("shape.change", "Change Shape", ["Shape Format", "Insert Shapes", "Edit Shape"], None, "{preset, ids?}", has_selection, change),
+        cmd!(
+            "shape.smoothCorners",
+            "Smooth Corners",
+            ["Shape Format", "Insert Shapes", "Edit Shape"],
+            None,
+            "{smoothing: 0..100 (%), radius?: pt (default: the rounded rectangle's own), ids?} → rectangle outline with smoothed (squircle) corners",
+            has_selection,
+            smooth_corners
+        ),
         cmd!(
             "shape.fill",
             "Shape Fill",
@@ -216,6 +225,39 @@ fn adjust(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
+/// Rectangles and rounded rectangles become custom geometry whose corners are smoothed
+/// ([`deckcraft_geom::squircle`]); the radius is the rounded rectangle's own unless `radius` says.
+fn smooth_corners(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "shape.smoothCorners";
+    let smoothing =
+        f64_param(p, "smoothing").filter(|v| v.is_finite()).ok_or_else(|| bad(CMD, "missing `smoothing` (0–100)"))?.clamp(0.0, 100.0) / 100.0;
+    let radius = f64_param(p, "radius").filter(|v| v.is_finite()).map(|v| v.max(0.0));
+    edit_geometry(s, p, CMD, |sh| {
+        let Some(x) = sh.xfrm else { return Err(bad(CMD, "the shape has no size of its own")) };
+        let ss = x.w.min(x.h).max(0.0);
+        let own = match &sh.geom {
+            Geom::Preset { name, adj } if name == "roundRect" => Some(ss * adj.first().copied().unwrap_or(16667.0).clamp(0.0, 50000.0) / 100000.0),
+            Geom::Preset { name, .. } if name == "rect" => Some(ss * 16667.0 / 100000.0),
+            _ => None,
+        };
+        let custom = matches!(sh.geom, Geom::Custom { .. });
+        let r = match (radius, own) {
+            (Some(r), _) if own.is_some() || custom => r,
+            (None, Some(r)) => r,
+            _ => return Err(bad(CMD, "only rectangles and rounded rectangles can be smoothed (custom outlines need `radius`)")),
+        };
+        sh.geom = Geom::Custom {
+            paths: vec![deckcraft_model::CustomPath {
+                w: x.w,
+                h: x.h,
+                d: deckcraft_geom::squircle::path_d(x.w, x.h, r, smoothing),
+                ..Default::default()
+            }],
+        };
+        Ok(())
+    })
+}
+
 fn change(s: &mut Session, p: &Value) -> Result<Value> {
     let name = str_param(p, "preset").ok_or_else(|| bad("shape.change", "missing `preset`"))?;
     let info = deckcraft_geom::preset::info(name).ok_or_else(|| bad("shape.change", format!("unknown preset `{name}`")))?;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..3196d43e 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,32 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// Smooth Corners (#286): a rounded rectangle becomes a squircle outline that survives PPTX.
+#[test]
+fn smooth_corners_makes_a_squircle_outline() {
+    let mut s = session();
+    let r = s.execute("shape.insert", &json!({"preset": "roundRect", "rect": [100, 100, 200, 100]})).unwrap();
+    let id = deckcraft_model::ShapeId(r["id"].as_u64().unwrap() as u32);
+    s.execute("shape.smoothCorners", &json!({"smoothing": 60})).unwrap();
+    let d = |s: &Session| match &s.doc().unwrap().shape(id).unwrap().geom {
+        deckcraft_model::Geom::Custom { paths } => paths[0].d.clone(),
+        g => panic!("{g:?}"),
+    };
+    // The default roundRect radius is 16.667% of the short side: 16.667 pt, smoothed 60%.
+    assert_eq!(d(&s), deckcraft_geom::squircle::path_d(200.0, 100.0, 16.667, 0.6));
+    // A custom outline takes a new smoothing with an explicit radius; without one it is refused.
+    s.execute("shape.smoothCorners", &json!({"smoothing": 100, "radius": 30})).unwrap();
+    assert_eq!(d(&s), deckcraft_geom::squircle::path_d(200.0, 100.0, 30.0, 1.0));
+    assert!(s.execute("shape.smoothCorners", &json!({"smoothing": 50})).is_err());
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(d(&s), deckcraft_geom::squircle::path_d(200.0, 100.0, 16.667, 0.6));
+    // Other shapes are refused.
+    s.execute("shape.insert", &json!({"preset": "ellipse", "rect": [0, 0, 50, 50]})).unwrap();
+    assert!(s.execute("shape.smoothCorners", &json!({"smoothing": 50})).is_err());
+    // The outline round-trips through PPTX as custom geometry.
+    let bytes = crate::cmd::file::save_bytes(&s.doc().unwrap().doc, "pptx").unwrap();
+    let back = crate::cmd::file::open_presentation("x.pptx", &bytes).unwrap();
+    let sh = back.slides.iter().flat_map(|sl| sl.shapes.iter()).find(|sh| matches!(sh.geom, deckcraft_model::Geom::Custom { .. }));
+    assert!(sh.is_some(), "a custom outline in the saved file");
+}
diff --git a/crates/geom/src/lib.rs b/crates/geom/src/lib.rs
index dd41db37..3be72e03 100644
--- a/crates/geom/src/lib.rs
+++ b/crates/geom/src/lib.rs
@@ -8,6 +8,7 @@
 
 pub mod morph;
 pub mod preset;
+pub mod squircle;
 pub mod warp;
 
 pub use kurbo::{Affine, BezPath, PathEl, Point, Rect, Shape as KurboShape, Size, Vec2};
diff --git a/crates/geom/src/squircle.rs b/crates/geom/src/squircle.rs
new file mode 100644
index 00000000..8dedc972
--- /dev/null
+++ b/crates/geom/src/squircle.rs
@@ -0,0 +1,183 @@
+//! Rectangles with smoothed ("squircle") corners, as design tools offer next to the corner radius
+//! (#286). A plain rounded corner joins the straight edge with a sudden change of curvature; a
+//! smoothed corner starts curving earlier, along a cubic Bézier, and keeps a shorter circular arc
+//! in the middle, so the outline flows into the edge.
+//!
+//! For a corner of radius `r` and smoothing `s` (0 = circular, 1 = no arc left), the corner takes
+//! `p = (1 + s) · r` of each edge. The arc keeps `90° · (1 − s)` around the corner's diagonal and
+//! each side of it is a cubic whose handles lie on the edge, so the curve is tangent to the edge
+//! where it starts and to the arc where it meets it. When `p` would exceed half the shorter side,
+//! the smoothing is reduced first, then the radius. The construction is our own derivation from
+//! these constraints.
+
+/// The outline of a `w` x `h` rectangle with corners of radius `radius` smoothed by `smoothing`
+/// (0..=1), as path data in the rectangle's own coordinates (`M`, `L`, `C`, `Z`; y down).
+pub fn path_d(w: f64, h: f64, radius: f64, smoothing: f64) -> String {
+    let w = if w.is_finite() { w.max(0.0) } else { 0.0 };
+    let h = if h.is_finite() { h.max(0.0) } else { 0.0 };
+    let half = w.min(h) / 2.0;
+    let r = if radius.is_finite() { radius.clamp(0.0, half) } else { 0.0 };
+    let mut s = if smoothing.is_finite() { smoothing.clamp(0.0, 1.0) } else { 0.0 };
+    if r <= 0.0 {
+        return format!("M 0 0 L {w} 0 L {w} {h} L 0 {h} Z");
+    }
+    s = s.min(half / r - 1.0).max(0.0);
+    let c = corner(r, s);
+    // The top-right corner in local terms: `u` runs back along the top edge from the corner,
+    // `v` down the right edge. Each corner maps (u, v) to the rectangle by symmetry.
+    let corners: [&dyn Fn(f64, f64) -> (f64, f64); 4] = [
+        &|u, v| (w - u, v),     // top right: from the top edge to the right edge
+        &|u, v| (w - v, h - u), // bottom right: from the right edge to the bottom edge
+        &|u, v| (u, h - v),     // bottom left: from the bottom edge to the left edge
+        &|u, v| (v, u),         // top left: from the left edge to the top edge
+    ];
+    let mut d = String::new();
+    let pt = |f: &dyn Fn(f64, f64) -> (f64, f64), (u, v): (f64, f64)| {
+        let (x, y) = f(u, v);
+        format!("{} {}", round(x), round(y))
+    };
+    for (i, f) in corners.iter().enumerate() {
+        let segs = c.segments();
+        if i == 0 {
+            d.push_str(&format!("M {}", pt(*f, segs[0])));
+        } else {
+            d.push_str(&format!(" L {}", pt(*f, segs[0])));
+        }
+        for k in 0..3 {
+            let b = 1 + k * 3;
+            d.push_str(&format!(" C {} {} {}", pt(*f, segs[b]), pt(*f, segs[b + 1]), pt(*f, segs[b + 2])));
+        }
+    }
+    d.push_str(" Z");
+    d
+}
+
+fn round(v: f64) -> f64 {
+    (v * 1000.0).round() / 1000.0 + 0.0
+}
+
+/// One corner in (u, v) terms: distance back along the incoming edge, distance along the outgoing.
+struct Corner {
+    p: f64,
+    a: f64,
+    b: f64,
+    c: f64,
+    d: f64,
+    r: f64,
+    arc: f64,
+}
+
+fn corner(r: f64, s: f64) -> Corner {
+    use std::f64::consts::{FRAC_PI_2, FRAC_PI_4};
+    let p = (1.0 + s) * r;
+    let arc = FRAC_PI_2 * (1.0 - s);
+    // The arc's chord, and where the edge curve meets the arc.
+    let arc_chord = (arc / 2.0).sin() * r * std::f64::consts::SQRT_2;
+    let alpha = (FRAC_PI_2 - arc) / 2.0;
+    let p3_p4 = r * (alpha / 2.0).tan();
+    let beta = FRAC_PI_4 * s;
+    let c = p3_p4 * beta.cos();
+    let d = c * beta.tan();
+    let b = ((p - arc_chord - c - d) / 3.0).max(0.0);
+    let a = 2.0 * b;
+    Corner { p, a, b, c, d, r, arc }
+}
+
+impl Corner {
+    /// Ten points: the start on the incoming edge, then three cubics (control, control, end):
+    /// edge → arc start, the arc, arc end → outgoing edge.
+    fn segments(&self) -> [(f64, f64); 10] {
+        let Corner { p, a, b, c, d, r, arc } = *self;
+        // Edge curve into the arc: handles on the edge, ending where the arc starts.
+        let e0 = (p, 0.0);
+        let e1 = (p - a, 0.0);
+        let e2 = (p - a - b, 0.0);
+        let e3 = (p - a - b - c, d);
+        // The arc around the centre (r, r) in (u, v), symmetric about the corner's diagonal.
+        // Angles from +u towards +v: the corner itself is at 5π/4 from the centre; the arc runs
+        // from the incoming edge's side (larger angle) to the outgoing edge's side.
+        let start = std::f64::consts::FRAC_PI_4 * 5.0 + arc / 2.0;
+        let end = start - arc;
+        let at = |t: f64| (r + r * t.cos(), r + r * t.sin());
+        let k = 4.0 / 3.0 * (arc / 4.0).tan() * r;
+        let a0 = at(start);
+        let a3 = at(end);
+        // Tangent of the arc travelled towards smaller angles: (sin t, −cos t).
+        let a1 = (a0.0 + k * start.sin(), a0.1 - k * start.cos());
+        let a2 = (a3.0 - k * end.sin(), a3.1 + k * end.cos());
+        // Mirror of the edge curve onto the outgoing edge (swap u and v), reversed.
+        let o1 = (e2.1, e2.0);
+        let o2 = (e1.1, e1.0);
+        let o3 = (e0.1, e0.0);
+        let _ = (e3, a0);
+        [e0, e1, e2, a0, a1, a2, a3, o1, o2, o3]
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn numbers(d: &str) -> Vec<f64> {
+        d.split_whitespace().filter_map(|t| t.parse().ok()).collect()
+    }
+
+    #[test]
+    fn no_radius_is_a_rectangle() {
+        assert_eq!(path_d(100.0, 50.0, 0.0, 0.6), "M 0 0 L 100 0 L 100 50 L 0 50 Z");
+    }
+
+    #[test]
+    fn edge_curve_meets_the_arc() {
+        for s in [0.0, 0.3, 0.6, 1.0] {
+            let c = corner(10.0, s);
+            let seg = c.segments();
+            let e3 = (c.p - c.a - c.b - c.c, c.d);
+            // The arc starts on the circle and where the edge curve ends.
+            assert!((seg[3].0 - e3.0).abs() < 1e-6 && (seg[3].1 - e3.1).abs() < 1e-6, "s={s}: {:?} vs {:?}", seg[3], e3);
+            // The arc is symmetric about the diagonal u = v.
+            assert!((seg[3].0 - seg[6].1).abs() < 1e-9 && (seg[3].1 - seg[6].0).abs() < 1e-9);
+        }
+    }
+
+    #[test]
+    fn zero_smoothing_is_a_circular_corner() {
+        let c = corner(10.0, 0.0);
+        let seg = c.segments();
+        assert!((c.p - 10.0).abs() < 1e-9);
+        assert!((seg[3].0 - 10.0).abs() < 1e-9 && seg[3].1.abs() < 1e-9);
+        assert!((seg[6].0).abs() < 1e-9 && (seg[6].1 - 10.0).abs() < 1e-9);
+    }
+
+    #[test]
+    fn smoothing_uses_more_of_the_edge() {
+        let d0 = numbers(&path_d(200.0, 100.0, 20.0, 0.0));
+        let d6 = numbers(&path_d(200.0, 100.0, 20.0, 0.6));
+        // The first point is where the top-right corner starts on the top edge.
+        assert_eq!((d0[0], d0[1]), (180.0, 0.0));
+        assert_eq!((d6[0], d6[1]), (168.0, 0.0));
+    }
+
+    #[test]
+    fn stays_inside_and_reduces_smoothing_when_the_rectangle_is_small() {
+        for (w, h, r, s) in [(100.0, 40.0, 20.0, 1.0), (40.0, 40.0, 50.0, 0.8), (10.0, 300.0, 4.0, 0.6), (300.0, 120.0, 30.0, 0.6)] {
+            let n = numbers(&path_d(w, h, r, s));
+            assert!(n.chunks(2).all(|p| p[0] >= -1e-6 && p[0] <= w + 1e-6 && p[1] >= -1e-6 && p[1] <= h + 1e-6), "{w}x{h} r{r} s{s}");
+            // Corners never cross the middle of an edge.
+            assert!(n[0] >= w / 2.0 - 1e-6);
+        }
+        assert!(numbers(&path_d(f64::NAN, 10.0, f64::INFINITY, f64::NAN)).iter().all(|v| v.is_finite()));
+    }
+
+    #[test]
+    fn four_symmetric_corners() {
+        let n = numbers(&path_d(120.0, 80.0, 16.0, 0.6));
+        // 4 corners x 10 points, 2 numbers each.
+        assert_eq!(n.len(), 80);
+        let pts: Vec<(f64, f64)> = n.chunks(2).map(|p| (p[0], p[1])).collect();
+        for &(x, y) in &pts {
+            let mirrored = (120.0 - x, 80.0 - y);
+            assert!(pts.iter().any(|q| (q.0 - mirrored.0).abs() < 0.01 && (q.1 - mirrored.1).abs() < 0.01), "{x},{y}");
+        }
+    }
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..ad8a814f 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1891,6 +1891,8 @@ fn shape_format(app: &mut SlideApp, ui: &mut Ui) {
             if let Some(p) = shapes_gallery(ui) {
                 run(app, "shape.change", json!({"preset": p}));
             }
+            ui.separator();
+            smooth_corners_row(app, ui);
         });
         let can_merge = enabled(app, "shape.merge");
         let r = big_button(ui, Icon::MergeShapes, "Merge\nShapes", can_merge).on_hover_text("Merge Shapes");
@@ -2420,3 +2422,45 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+/// Edit Shape ▸ Smooth Corners (#286): a slider that smooths a rectangle's corners into a
+/// squircle. The radius is taken from the rectangle when the slider is first used and kept (in egui
+/// memory, per shape) so later moves re-smooth the same corners.
+fn smooth_corners_row(app: &mut SlideApp, ui: &mut egui::Ui) {
+    let Some((id, radius)) = app.session.active().and_then(|d| {
+        let id = *d.selection.shapes.first()?;
+        let sh = d.shape(id)?;
+        let x = sh.xfrm?;
+        let ss = x.w.min(x.h).max(0.0);
+        let own = match &sh.geom {
+            deckcraft_model::Geom::Preset { name, adj } if name == "roundRect" => {
+                Some(ss * adj.first().copied().unwrap_or(16667.0).clamp(0.0, 50000.0) / 100000.0)
+            }
+            deckcraft_model::Geom::Preset { name, .. } if name == "rect" => Some(ss * 16667.0 / 100000.0),
+            _ => None,
+        };
+        Some((id, own))
+    }) else {
+        return;
+    };
+    let key = egui::Id::new(("deckcraft-smooth-corners", id.0));
+    let mut state: (f64, f64) = ui.data(|d| d.get_temp(key)).unwrap_or((radius.unwrap_or(0.0), 0.0));
+    if let Some(r) = radius {
+        state.0 = r;
+    }
+    let usable = radius.is_some() || ui.data(|d| d.get_temp::<(f64, f64)>(key)).is_some();
+    ui.horizontal(|ui| {
+        ui.label("Smooth Corners");
+        let mut pct = state.1;
+        let resp = ui.add_enabled(usable, egui::Slider::new(&mut pct, 0.0..=100.0).suffix("%").integer());
+        let resp = if usable { resp } else { resp.on_disabled_hover_text("For rectangles and rounded rectangles") };
+        if resp.changed() {
+            state.1 = pct;
+            ui.data_mut(|d| d.insert_temp(key, state));
+        }
+        // One undo step per adjustment: apply when the drag ends (or on a click / keyboard step).
+        if resp.drag_stopped() || (resp.changed() && !resp.dragged()) {
+            run(app, "shape.smoothCorners", json!({"smoothing": state.1, "radius": state.0}));
+        }
+    });
+}

From 1b9b830f323afb7e4540048de8bb33aa76bfb4a9 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:30:05 +0300
Subject: [PATCH 140/376] Animation Pane: advanced timeline with draggable bars

The pane's bars now come from deckcraft_anim::Timeline, the same schedule the
slide show plays, so With/After Previous, delays, repeats and auto-reverse line
up on a shared seconds ruler. Dragging a bar sets the delay and dragging its
right edge sets the duration (snapped to 0.05 s), each through
animation.timing, so one undoable command per drag. Bar geometry and drag maths
live in animtimeline.rs as pure, unit-tested functions; kittest drives the
drags. Parity and gaps docs updated.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/ui-egui/src/animpane_tests.rs |  90 ++++++++++++++++
 crates/ui-egui/src/animtimeline.rs   | 150 +++++++++++++++++++++++++++
 crates/ui-egui/src/lib.rs            |   3 +
 crates/ui-egui/src/panes.rs          | 100 +++++++++++++++---
 docs/animation-parity.md             |   4 +-
 docs/gaps.md                         |   2 +-
 6 files changed, 331 insertions(+), 18 deletions(-)
 create mode 100644 crates/ui-egui/src/animpane_tests.rs
 create mode 100644 crates/ui-egui/src/animtimeline.rs

diff --git a/crates/ui-egui/src/animpane_tests.rs b/crates/ui-egui/src/animpane_tests.rs
new file mode 100644
index 00000000..7fe2d875
--- /dev/null
+++ b/crates/ui-egui/src/animpane_tests.rs
@@ -0,0 +1,90 @@
+//! The Animation Pane's advanced timeline driven with the mouse: dragging a bar changes the
+//! delay, dragging its right edge changes the duration, each one undoable command.
+
+use deckcraft_engine::Session;
+use egui::Pos2;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+/// A blank slide with two shapes: Fade on click (1 s), then Zoom after previous (2 s).
+fn harness() -> Harness<'static, SlideApp> {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    for (i, (effect, start, dur)) in [("fade", "onClick", 1000), ("zoom", "afterPrevious", 2000)].iter().enumerate() {
+        let id =
+            s.execute("shape.insert", &json!({"preset": "rect", "rect": [40.0 + 200.0 * i as f64, 80, 150, 100]})).unwrap()["id"].as_u64().unwrap();
+        s.execute("edit.select", &json!({"ids": [id]})).unwrap();
+        s.execute("animation.add", &json!({"effect": effect, "start": start, "duration": dur})).unwrap();
+    }
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.pane = Some("animation".into());
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn timing(h: &Harness<'_, SlideApp>, i: usize) -> (u32, u32) {
+    let a = &h.state().session.active().unwrap().current_slide().unwrap().animations[i];
+    (a.delay_ms, a.duration_ms)
+}
+
+fn drag(h: &mut Harness<'_, SlideApp>, from: Pos2, to: Pos2) {
+    h.hover_at(from);
+    h.run_steps(1);
+    h.drag_at(from);
+    h.run_steps(1);
+    for i in 1..=6 {
+        h.hover_at(from + (to - from) * (i as f32 / 6.0));
+        h.run_steps(1);
+    }
+    h.drop_at(to);
+    h.run_steps(3);
+}
+
+#[test]
+fn after_previous_bar_starts_where_the_first_ends() {
+    let h = harness();
+    let a = h.get_by_label("Timing bar 1").rect();
+    let b = h.get_by_label("Timing bar 2").rect();
+    assert!((b.left() - a.right()).abs() < 1.5, "{a:?} {b:?}");
+    assert!((b.width() - 2.0 * a.width()).abs() < 1.5, "2 s bar twice the 1 s bar");
+}
+
+#[test]
+fn dragging_a_bar_sets_the_delay_and_undoes() {
+    let mut h = harness();
+    let a = h.get_by_label("Timing bar 1").rect();
+    // One second is the width of bar 1.
+    drag(&mut h, a.center(), a.center() + egui::vec2(a.width() / 2.0, 0.0));
+    assert_eq!(timing(&h, 0), (500, 1000));
+    h.state_mut().session.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(timing(&h, 0), (0, 1000));
+}
+
+#[test]
+fn dragging_the_edge_sets_the_duration() {
+    let mut h = harness();
+    let b = h.get_by_label("Timing bar 2").rect();
+    let one_sec = b.width() / 2.0;
+    let edge = h.get_by_label("Duration handle 2").rect().center();
+    drag(&mut h, edge, edge - egui::vec2(one_sec, 0.0));
+    assert_eq!(timing(&h, 1), (0, 1000));
+}
+
+#[test]
+#[ignore = "writes a screenshot for review"]
+fn screenshot() {
+    let mut h = harness();
+    h.run_steps(2);
+    let img = h.render().unwrap();
+    img.save("/tmp/animpane.png").unwrap();
+}
diff --git a/crates/ui-egui/src/animtimeline.rs b/crates/ui-egui/src/animtimeline.rs
new file mode 100644
index 00000000..bdd1a1dc
--- /dev/null
+++ b/crates/ui-egui/src/animtimeline.rs
@@ -0,0 +1,150 @@
+//! Animation Pane advanced timeline: bar geometry and drag-to-retime maths.
+//!
+//! Pure functions so the layout and the drag results are unit-tested without a frame. Times
+//! come from [`deckcraft_anim::Timeline`], the same schedule the slide show plays.
+
+use deckcraft_anim::{EffectTiming, Sequence};
+
+/// Drags snap to this step (milliseconds), like PowerPoint's 0.05 s granularity.
+pub const SNAP_MS: u32 = 50;
+/// Shortest duration a drag can produce (milliseconds).
+pub const MIN_DURATION_MS: u32 = 50;
+/// Upper bound for delay and duration, matching `animation.timing`'s clamp.
+pub const MAX_MS: u32 = 600_000;
+/// Pixels per second are kept in this range whatever the pane width.
+const MIN_PPS: f32 = 8.0;
+const MAX_PPS: f32 = 120.0;
+
+/// One effect row of the timeline (first paragraph of a by-paragraph build).
+#[derive(Clone, Debug, PartialEq)]
+pub struct Bar {
+    /// Index into `slide.animations`.
+    pub anim: usize,
+    /// Click step in the main sequence, or `None` for a triggered sequence.
+    pub step: Option<usize>,
+    /// Start within the step, delay included (seconds).
+    pub start: f64,
+    /// Start to end, all repeats included (seconds).
+    pub span: f64,
+}
+
+/// One bar per animation, in `slide.animations` order; animations without timing get `None`.
+pub fn bars(count: usize, effects: &[EffectTiming]) -> Vec<Option<Bar>> {
+    let mut out: Vec<Option<Bar>> = vec![None; count];
+    for e in effects {
+        let Some(slot) = out.get_mut(e.anim) else { continue };
+        if slot.is_some() {
+            continue;
+        }
+        let start = if e.start.is_finite() { e.start.max(0.0) } else { 0.0 };
+        let span = if e.span.is_finite() { e.span.max(0.0) } else { 0.0 };
+        let step = match e.sequence {
+            Sequence::Main => Some(e.step),
+            Sequence::Trigger(_) => None,
+        };
+        *slot = Some(Bar { anim: e.anim, step, start, span });
+    }
+    out
+}
+
+/// Seconds the ruler must show: the longest bar end, at least one second, rounded up.
+pub fn ruler_seconds(bars: &[Option<Bar>]) -> u32 {
+    let end = bars.iter().flatten().map(|b| b.start + b.span).fold(1.0_f64, f64::max);
+    let s = end.ceil().min(f64::from(MAX_MS / 1000));
+    if s.is_finite() && s >= 1.0 { s as u32 } else { 1 }
+}
+
+/// Pixels per second so `seconds` fit in `width`.
+pub fn pixels_per_second(width: f32, seconds: u32) -> f32 {
+    let secs = seconds.max(1) as f32;
+    let pps = if width.is_finite() { width / secs } else { MIN_PPS };
+    pps.clamp(MIN_PPS, MAX_PPS)
+}
+
+fn snap(ms: f64) -> u32 {
+    if !ms.is_finite() || ms <= 0.0 {
+        return 0;
+    }
+    let snapped = (ms / f64::from(SNAP_MS)).round() * f64::from(SNAP_MS);
+    if snapped >= f64::from(MAX_MS) { MAX_MS } else { snapped as u32 }
+}
+
+fn delta_ms(dx: f32, pps: f32) -> f64 {
+    if !dx.is_finite() || !pps.is_finite() || pps <= 0.0 { 0.0 } else { f64::from(dx) / f64::from(pps) * 1000.0 }
+}
+
+/// New delay after dragging a bar's body `dx` pixels.
+pub fn dragged_delay(delay_ms: u32, dx: f32, pps: f32) -> u32 {
+    snap(f64::from(delay_ms) + delta_ms(dx, pps))
+}
+
+/// New duration after dragging a bar's right edge `dx` pixels. The bar shows all `repeats`
+/// (auto-reverse doubles each), so the edge moves `factor` times as fast as one iteration.
+pub fn dragged_duration(duration_ms: u32, dx: f32, pps: f32, factor: f64) -> u32 {
+    let factor = if factor.is_finite() && factor >= 1.0 { factor } else { 1.0 };
+    snap(f64::from(duration_ms) + delta_ms(dx, pps) / factor).max(MIN_DURATION_MS)
+}
+
+/// Tooltip text for a bar: `Start: 0.5s, End: 2.5s`.
+pub fn label(bar: &Bar) -> String {
+    format!("Start: {:.2}s, End: {:.2}s", bar.start, bar.start + bar.span)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use deckcraft_model::{AnimClass, ShapeId};
+
+    fn eff(anim: usize, step: usize, start: f64, span: f64) -> EffectTiming {
+        EffectTiming {
+            anim,
+            shape: ShapeId(1),
+            paragraph: None,
+            sequence: Sequence::Main,
+            step,
+            start,
+            duration: span,
+            iterations: 1.0,
+            until_next_click: false,
+            auto_reverse: false,
+            rewind: false,
+            span,
+            class: AnimClass::Entrance,
+        }
+    }
+
+    #[test]
+    fn first_paragraph_wins_and_missing_are_none() {
+        let b = bars(3, &[eff(0, 0, 0.0, 0.5), eff(0, 0, 0.5, 0.5), eff(2, 1, f64::NAN, -1.0), eff(9, 0, 0.0, 1.0)]);
+        assert_eq!(b[0], Some(Bar { anim: 0, step: Some(0), start: 0.0, span: 0.5 }));
+        assert_eq!(b[1], None);
+        assert_eq!(b[2], Some(Bar { anim: 2, step: Some(1), start: 0.0, span: 0.0 }));
+    }
+
+    #[test]
+    fn ruler_and_scale() {
+        assert_eq!(ruler_seconds(&[]), 1);
+        assert_eq!(ruler_seconds(&bars(1, &[eff(0, 0, 1.2, 2.0)])), 4);
+        assert_eq!(pixels_per_second(200.0, 4), 50.0);
+        assert_eq!(pixels_per_second(10_000.0, 1), MAX_PPS);
+        assert_eq!(pixels_per_second(f32::NAN, 0), MIN_PPS);
+    }
+
+    #[test]
+    fn drags_snap_and_clamp() {
+        assert_eq!(dragged_delay(0, 25.0, 50.0), 500);
+        assert_eq!(dragged_delay(500, -100.0, 50.0), 0);
+        assert_eq!(dragged_delay(0, 13.0, 50.0), 250);
+        assert_eq!(dragged_delay(0, f32::INFINITY, 50.0), 0);
+        assert_eq!(dragged_delay(MAX_MS, 1.0e9, 1.0), MAX_MS);
+        assert_eq!(dragged_duration(500, 50.0, 50.0, 1.0), 1500);
+        assert_eq!(dragged_duration(500, 50.0, 50.0, 2.0), 1000);
+        assert_eq!(dragged_duration(500, -1000.0, 50.0, 1.0), MIN_DURATION_MS);
+        assert_eq!(dragged_duration(500, 0.0, 0.0, f64::NAN), 500);
+    }
+
+    #[test]
+    fn label_text() {
+        assert_eq!(label(&Bar { anim: 0, step: None, start: 0.5, span: 2.0 }), "Start: 0.50s, End: 2.50s");
+    }
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..22af2a02 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -6,6 +6,7 @@
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
 
+pub mod animtimeline;
 pub mod backstage;
 pub mod canvas;
 pub mod control;
@@ -1127,6 +1128,8 @@ fn js_now() -> f64 {
     js_sys::Date::now()
 }
 
+#[cfg(test)]
+mod animpane_tests;
 #[cfg(test)]
 mod ime_tests;
 
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..66e53725 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -5,6 +5,7 @@ use deckcraft_model::{AnimClass, AnimStart, Fill, ShapeKind};
 use egui::{Align2, Color32, CornerRadius, Rect, Sense, Stroke, Ui, pos2, vec2};
 use serde_json::{Value, json};
 
+use crate::animtimeline;
 use crate::icons::{self, Icon};
 use crate::ribbon::{cref_param, paint_anim_tile};
 use crate::theme::{self, Tokens};
@@ -462,6 +463,8 @@ fn animation(app: &mut SlideApp, ui: &mut Ui) {
     let Some(st) = app.session.active() else { return };
     let Some(slide) = st.current_slide() else { return };
     let anims = slide.animations.clone();
+    let size = (st.doc.slide_size.width, st.doc.slide_size.height);
+    let effects = deckcraft_anim::Timeline::new(slide, size.0, size.1).effects();
     let names: Vec<(u32, String)> = st.shapes().iter().map(|s| (s.id.0, s.name.clone())).collect();
     let selected: Vec<u32> = st.selection.shapes.iter().map(|i| i.0).collect();
     ui.horizontal(|ui| {
@@ -479,6 +482,10 @@ fn animation(app: &mut SlideApp, ui: &mut Ui) {
         ui.label(egui::RichText::new("Select an object on the slide and add an animation from the Animations tab.").color(t.text_dim));
         return;
     }
+    let bars = animtimeline::bars(anims.len(), &effects);
+    let seconds = animtimeline::ruler_seconds(&bars);
+    let track_w = (ui.available_width() * 0.45).max(60.0);
+    let pps = animtimeline::pixels_per_second(track_w, seconds);
     let mut click = 0;
     for (i, a) in anims.iter().enumerate() {
         if a.start == AnimStart::OnClick {
@@ -506,20 +513,70 @@ fn animation(app: &mut SlideApp, ui: &mut Ui) {
         };
         icons::paint(p, Rect::from_center_size(pos2(r.min.x + 30.0, r.center().y), vec2(18.0, 18.0)), icon, t.text, false);
         p.text(pos2(r.min.x + 44.0, r.center().y), Align2::LEFT_CENTER, &name, theme::font(12.5), t.text);
-        // Timeline bar.
-        let bar_x = r.max.x - 80.0;
-        let w = (a.duration_ms as f32 / 1000.0 * 20.0).clamp(4.0, 70.0);
-        let col = match a.class {
-            AnimClass::Entrance => Color32::from_rgb(0x2E, 0xA3, 0x6F),
-            AnimClass::Emphasis => Color32::from_rgb(0xE3, 0xB2, 0x1C),
-            AnimClass::Exit => Color32::from_rgb(0xD8, 0x3F, 0x6B),
-            _ => Color32::from_rgb(0x2E, 0x6F, 0xD8),
-        };
-        p.rect_filled(
-            Rect::from_min_size(pos2(bar_x + (a.delay_ms as f32 / 1000.0 * 20.0).min(40.0), r.center().y - 4.0), vec2(w, 8.0)),
-            CornerRadius::same(2),
-            col,
-        );
+        // Advanced timeline bar: drag the body to change the delay, the right edge for the duration.
+        if let Some(Some(b)) = bars.get(i) {
+            let col = match a.class {
+                AnimClass::Entrance => Color32::from_rgb(0x2E, 0xA3, 0x6F),
+                AnimClass::Emphasis => Color32::from_rgb(0xE3, 0xB2, 0x1C),
+                AnimClass::Exit => Color32::from_rgb(0xD8, 0x3F, 0x6B),
+                _ => Color32::from_rgb(0x2E, 0x6F, 0xD8),
+            };
+            let x0 = r.max.x - track_w - 6.0;
+            let x_of = |sec: f64| x0 + (sec as f32 * pps).min(track_w);
+            let mut bar = Rect::from_min_max(
+                pos2(x_of(b.start), r.center().y - 5.0),
+                pos2(x_of(b.start + b.span).max(x_of(b.start) + 4.0), r.center().y + 5.0),
+            );
+            let edge = Rect::from_min_max(pos2(bar.max.x - 3.0, bar.min.y - 3.0), pos2(bar.max.x + 4.0, bar.max.y + 3.0));
+            let body_resp = ui.interact(bar, ui.id().with(("anim_bar", i)), Sense::drag()).on_hover_text(animtimeline::label(b));
+            body_resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Other, true, format!("Timing bar {}", i + 1)));
+            let edge_resp = ui.interact(edge, ui.id().with(("anim_edge", i)), Sense::drag());
+            edge_resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Other, true, format!("Duration handle {}", i + 1)));
+            if edge_resp.hovered() || edge_resp.dragged() {
+                ui.ctx().set_cursor_icon(egui::CursorIcon::ResizeHorizontal);
+            } else if body_resp.hovered() || body_resp.dragged() {
+                ui.ctx().set_cursor_icon(egui::CursorIcon::Grab);
+            }
+            // The drag offset is remembered: the pointer's press origin is gone on release.
+            let dx_id = ui.id().with(("anim_drag_dx", i));
+            let live = ui.input(|inp| match (inp.pointer.press_origin(), inp.pointer.interact_pos()) {
+                (Some(o), Some(p)) => Some(p.x - o.x),
+                _ => None,
+            });
+            let dx = match live {
+                Some(d) if body_resp.dragged() || edge_resp.dragged() => {
+                    ui.data_mut(|m| m.insert_temp(dx_id, d));
+                    d
+                }
+                _ => ui.data_mut(|m| m.get_temp::<f32>(dx_id)).unwrap_or(0.0),
+            };
+            if body_resp.drag_stopped() || edge_resp.drag_stopped() {
+                ui.data_mut(|m| m.remove::<f32>(dx_id));
+            }
+            let iter_secs = f64::from(a.duration_ms) / 1000.0;
+            let factor = if iter_secs > 0.0 && b.span > 0.0 { b.span / iter_secs } else { 1.0 };
+            if edge_resp.dragged() || edge_resp.drag_stopped() {
+                let d = animtimeline::dragged_duration(a.duration_ms, dx, pps, factor);
+                bar.max.x = x_of(b.start + f64::from(d) / 1000.0 * factor).max(bar.min.x + 4.0);
+                if edge_resp.drag_stopped() && d != a.duration_ms {
+                    run(app, "animation.timing", json!({"index": i, "duration": d}));
+                }
+            } else if body_resp.dragged() || body_resp.drag_stopped() {
+                let d = animtimeline::dragged_delay(a.delay_ms, dx, pps);
+                let shift = (f64::from(d) - f64::from(a.delay_ms)) / 1000.0;
+                let w = bar.width();
+                bar.min.x = x_of((b.start + shift).max(0.0));
+                bar.max.x = bar.min.x + w;
+                if body_resp.drag_stopped() && d != a.delay_ms {
+                    run(app, "animation.timing", json!({"index": i, "delay": d}));
+                }
+            }
+            let p = ui.painter();
+            p.rect_filled(bar, CornerRadius::same(2), col);
+            if a.repeat == u32::MAX {
+                p.text(pos2(bar.max.x + 2.0, bar.center().y), Align2::LEFT_CENTER, "⟳", theme::font(10.0), t.text_dim);
+            }
+        }
         if resp.clicked() {
             run(app, "edit.select", json!({"ids": [a.shape.0]}));
         }
@@ -545,8 +602,21 @@ fn animation(app: &mut SlideApp, ui: &mut Ui) {
             }
         });
     }
+    // Seconds ruler under the bars.
+    let (r, _) = ui.allocate_exact_size(vec2(ui.available_width(), 18.0), Sense::hover());
+    let x0 = r.max.x - track_w - 6.0;
+    let p = ui.painter();
+    p.line_segment([pos2(x0, r.min.y + 2.0), pos2(x0 + track_w, r.min.y + 2.0)], Stroke::new(1.0, t.text_faint));
+    let every = (seconds / 6).max(1);
+    for s in (0..=seconds).step_by(every as usize) {
+        let x = x0 + s as f32 * pps;
+        if x > x0 + track_w + 0.5 {
+            break;
+        }
+        p.line_segment([pos2(x, r.min.y), pos2(x, r.min.y + 5.0)], Stroke::new(1.0, t.text_faint));
+        p.text(pos2(x, r.min.y + 6.0), Align2::CENTER_TOP, format!("{s}s"), theme::font(10.0), t.text_dim);
+    }
     let _ = paint_anim_tile;
-    let _ = Stroke::NONE;
 }
 
 fn comments(app: &mut SlideApp, ui: &mut Ui) {
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 8ec5d0f4..186e259a 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -71,7 +71,7 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 | Triggers on a media bookmark | yes | no |
 | Animation Painter | yes | yes (#54) |
 | Animation Pane: list, reorder, remove | yes | yes |
-| Animation Pane: advanced timeline (bars you drag) | yes | **no** |
+| Animation Pane: advanced timeline (bars you drag) | yes | yes: bars from the show schedule, drag the body for delay, the right edge for duration, seconds ruler (`animpane_tests`) |
 | Preview in the editor (current effect, from selected) | yes | partly |
 | Motion path editing (edit points, reverse, lock) | yes | partly (no edit points) |
 | Multiple animations on one object | yes | yes |
@@ -81,7 +81,7 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 
 | Work | Hours |
 |---|---|
-| Animation Pane timeline, preview from selected, effect dialog depth | 5–8 |
+| Preview from selected, effect dialog depth | 4–6 |
 | The remaining ~126 effects (most are parameter variations of existing ones) | 3–6 |
 | Rewind and other effect options on round trip (#77) | 1–2 |
 | Transition sounds | 1–2 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..5ff11a19 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -26,7 +26,7 @@ revision history.
 | 7 | Fonts: only Regular, Bold and Italic faces (#69) | Feature | B | 3–5 | [ui-parity.md](ui-parity.md) |
 | 8 | Image paste fails on Windows and Linux (#53) | Feature | B | 2–4 | [ui-parity.md](ui-parity.md) |
 | 9 | Presenter view isn't placed on the second display | Hardware | B | 3–5 | [slideshow-parity.md](slideshow-parity.md) |
-| 10 | Animation Pane: no timeline, thin preview; 64 of ~190 effects | Feature | B (pane) | 10–16 | [animation-parity.md](animation-parity.md) |
+| 10 | Animation Pane: thin preview (timeline done); 64 of ~190 effects | Feature | B (pane) | 8–14 | [animation-parity.md](animation-parity.md) |
 | 11 | Charts: data grid editing, elements, `chartex` types | Feature | B (data, elements) | 12–20 | [parity-checklist.md](parity-checklist.md) |
 | 12 | Format Shape pane thinner than PowerPoint's | UI/UX | B | 6–10 | [ui-parity.md](ui-parity.md) |
 | 13 | No native macOS menu bar | UI/UX | B | 3–5 | [ui-parity.md](ui-parity.md) |

From e6920f8ebe25e1dd65111a2a873c542bd88f3943 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:43:54 +0300
Subject: [PATCH 141/376] Print: choose paper size and orientation for notes
 and handouts

The Print page always laid notes pages and handouts out on portrait US
Letter. It now offers Letter, A4, Legal and A3 in portrait or landscape,
as PowerPoint's Print settings do, and the preview shows the chosen
page. file.export, app.print and the MCP export tool take the same
`paper` and `orientation` params; unknown values are an error. A notes
page keeps its slide within the top half of the page, so landscape
paper still leaves room for the notes. Full-page slides still print on
slide-shaped pages.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/file.rs         | 17 +++++++--
 crates/engine/src/tests.rs            | 13 +++++++
 crates/mcp/src/tests.rs               |  8 +++--
 crates/mcp/src/tools.rs               |  4 ++-
 crates/pdf/src/lib.rs                 | 38 +++++++++++++++++---
 crates/pdf/src/tests.rs               | 33 ++++++++++++++++++
 crates/ui-egui/src/backstage.rs       | 50 +++++++++++++++++++++++++--
 crates/ui-egui/src/backstage_tests.rs |  9 +++++
 crates/ui-egui/src/lib.rs             |  7 +++-
 9 files changed, 165 insertions(+), 14 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..3d3582c6 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -15,7 +15,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!(noundo "file.saveAs", "Save As…", ["File"], Some("Cmd+Shift+S"), "{path, format?}", has_doc, save_as),
         cmd!(noundo "file.saveTemplate", "Save as Template…", ["File"], None, "{path}", has_doc, save_as),
         cmd!(query "file.saveBytes", "Save to Data", [], None, "{format?: deckcraft|pptx} → {data: base64}", has_doc, save_bytes_cmd),
-        cmd!(noundo "file.export", "Export…", ["File"], None, "{path, format: png|jpeg|pptx|deckcraft|outline|pdf, slide?: index, all?: bool, scale?: px per pt; pdf: layout?: slides|notes|handouts, perPage?: 1|2|3|4|6|9, dpi?, slides?: [index] | \"1-3,5\", includeHidden?, textLayer?, frame?}", has_doc, export),
+        cmd!(noundo "file.export", "Export…", ["File"], None, "{path, format: png|jpeg|pptx|deckcraft|outline|pdf, slide?: index, all?: bool, scale?: px per pt; pdf: layout?: slides|notes|handouts, perPage?: 1|2|3|4|6|9, paper?: letter|a4|legal|a3, orientation?: portrait|landscape, dpi?, slides?: [index] | \"1-3,5\", includeHidden?, textLayer?, frame?}", has_doc, export),
         cmd!(
             query "file.info",
             "Info",
@@ -127,8 +127,11 @@ pub fn save_bytes(doc: &Presentation, format: &str) -> Result<Vec<u8>> {
     }
 }
 
+/// Paper sizes for notes and handouts, for the UI's Print page.
+pub use deckcraft_pdf::{PAPERS, paper_size};
+
 /// PDF options from command params: `{layout: slides|notes|handouts, perPage, dpi, slides,
-/// includeHidden, textLayer, frame}` for a presentation of `count` slides. `slides` is a list of
+/// includeHidden, textLayer, frame, paper: letter|a4|legal|a3, orientation: portrait|landscape}` for a presentation of `count` slides. `slides` is a list of
 /// 0-based indices or a range as typed in PowerPoint's Print page (`"1-3, 5"`, 1-based).
 pub fn pdf_options(p: &Value, count: usize) -> Result<deckcraft_pdf::PdfOptions> {
     let mut o = deckcraft_pdf::PdfOptions { layout: deckcraft_pdf::PageLayout::Slides, ..Default::default() };
@@ -146,6 +149,16 @@ pub fn pdf_options(p: &Value, count: usize) -> Result<deckcraft_pdf::PdfOptions>
     o.include_hidden = bool_or(p, "includeHidden", false);
     o.text_layer = bool_or(p, "textLayer", true);
     o.frame_slides = bool_or(p, "frame", true);
+    let landscape = match str_param(p, "orientation").unwrap_or("portrait") {
+        "portrait" => false,
+        "landscape" => true,
+        other => return Err(bad("file.export", format!("orientation “{other}” isn't portrait or landscape"))),
+    };
+    let paper = str_param(p, "paper").unwrap_or("letter");
+    o.paper = deckcraft_pdf::paper_size(paper, landscape).ok_or_else(|| {
+        let ids: Vec<&str> = deckcraft_pdf::PAPERS.iter().map(|p| p.0).collect();
+        bad("file.export", format!("paper “{paper}” isn't one of {}", ids.join(", ")))
+    })?;
     Ok(o)
 }
 
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..091f2afd 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,16 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// The Print page's paper and orientation reach the PDF options; Letter portrait by default.
+#[test]
+fn pdf_options_take_paper_and_orientation() {
+    let o = cmd::file::pdf_options(&json!({}), 1).unwrap();
+    assert_eq!(o.paper, (612.0, 792.0));
+    let o = cmd::file::pdf_options(&json!({"paper": "A4", "orientation": "landscape"}), 1).unwrap();
+    assert_eq!(o.paper, (841.89, 595.28));
+    let o = cmd::file::pdf_options(&json!({"paper": "legal"}), 1).unwrap();
+    assert_eq!(o.paper, (612.0, 1008.0));
+    assert!(cmd::file::pdf_options(&json!({"paper": "tabloid"}), 1).is_err());
+    assert!(cmd::file::pdf_options(&json!({"orientation": "sideways"}), 1).is_err());
+}
diff --git a/crates/mcp/src/tests.rs b/crates/mcp/src/tests.rs
index b1521521..a7a0d780 100644
--- a/crates/mcp/src/tests.rs
+++ b/crates/mcp/src/tests.rs
@@ -103,7 +103,7 @@ fn export_tool_lists_pdf_and_its_options() {
     }
     assert_eq!(props["layout"]["enum"], json!(["slides", "notes", "handouts"]));
     assert_eq!(props["perPage"]["enum"], json!([1, 2, 3, 4, 6, 9]));
-    for p in ["dpi", "slides", "includeHidden", "textLayer", "frame"] {
+    for p in ["dpi", "slides", "includeHidden", "textLayer", "frame", "paper", "orientation"] {
         assert!(props.get(p).is_some(), "{p}: {export}");
     }
     // What the schema describes is accepted.
@@ -112,7 +112,11 @@ fn export_tool_lists_pdf_and_its_options() {
     tool(&mut s, "new_presentation", json!({}));
     for layout in ["slides", "notes", "handouts"] {
         let path = dir.join(format!("{layout}.pdf"));
-        tool(&mut s, "export", json!({"path": path.to_string_lossy(), "format": "pdf", "layout": layout, "perPage": 3}));
+        tool(
+            &mut s,
+            "export",
+            json!({"path": path.to_string_lossy(), "format": "pdf", "layout": layout, "perPage": 3, "paper": "a4", "orientation": "landscape"}),
+        );
         assert!(std::fs::read(&path).unwrap().starts_with(b"%PDF"), "{layout}");
     }
     let _ = std::fs::remove_dir_all(&dir);
diff --git a/crates/mcp/src/tools.rs b/crates/mcp/src/tools.rs
index 1a457dda..0e671ca6 100644
--- a/crates/mcp/src/tools.rs
+++ b/crates/mcp/src/tools.rs
@@ -129,7 +129,9 @@ pub fn tool_definitions() -> Vec<Value> {
                     "slides": {"type": "array", "items": {"type": "integer", "minimum": 0}, "description": "PDF: slide indices to export (default all)"},
                     "includeHidden": boolean("PDF: include hidden slides (default false)"),
                     "textLayer": boolean("PDF: invisible text layer for search, select and copy (default true)"),
-                    "frame": boolean("PDF notes/handouts: thin frame around each slide (default true)")
+                    "frame": boolean("PDF notes/handouts: thin frame around each slide (default true)"),
+                    "paper": {"type": "string", "enum": ["letter", "a4", "legal", "a3"], "description": "PDF notes/handouts: paper size (default letter)"},
+                    "orientation": {"type": "string", "enum": ["portrait", "landscape"], "description": "PDF notes/handouts: page orientation (default portrait)"}
                 }),
                 &["path"],
             ),
diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index 97eb641b..65f42de2 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -67,7 +67,7 @@ pub struct PdfOptions {
     pub frame_slides: bool,
     /// Document title (defaults to the presentation title).
     pub title: Option<String>,
-    /// Handout/notes page size in points (default US Letter portrait).
+    /// Handout/notes page size in points (default US Letter portrait; see [`paper_size`]).
     pub paper: (f64, f64),
 }
 
@@ -86,6 +86,36 @@ impl Default for PdfOptions {
     }
 }
 
+/// Paper sizes the Print page offers, as (id, label, width × height in points, portrait).
+pub const PAPERS: [(&str, &str, (f64, f64)); 4] = [
+    ("letter", "Letter (8.5 × 11 in)", (612.0, 792.0)),
+    ("a4", "A4 (210 × 297 mm)", (595.28, 841.89)),
+    ("legal", "Legal (8.5 × 14 in)", (612.0, 1008.0)),
+    ("a3", "A3 (297 × 420 mm)", (841.89, 1190.55)),
+];
+
+/// The page size in points for a paper id from [`PAPERS`] (case-insensitive), turned on its side
+/// when `landscape`. `None` for an unknown id.
+pub fn paper_size(id: &str, landscape: bool) -> Option<(f64, f64)> {
+    let (_, _, (w, h)) = PAPERS.iter().find(|p| p.0.eq_ignore_ascii_case(id.trim()))?;
+    Some(if landscape { (*h, *w) } else { (*w, *h) })
+}
+
+/// The slide box on a notes page of `paper`: an inch of margin at the sides and the slide at most
+/// half the page tall, so landscape paper still leaves room for the notes.
+pub fn notes_slide_box(paper: (f64, f64), aspect: f64) -> Rect {
+    let (pw, ph) = paper;
+    let mut w = (pw - 2.0 * 72.0).max(1.0);
+    let mut h = w / aspect.max(0.01);
+    let max_h = (ph * 0.5 - 54.0).max(1.0);
+    if h > max_h {
+        h = max_h;
+        w = h * aspect;
+    }
+    let x = (pw - w) / 2.0;
+    Rect::new(x, 54.0, x + w, 54.0 + h)
+}
+
 /// Export `pres` as PDF bytes.
 pub fn export(pres: &Presentation, opts: &PdfOptions) -> Result<Vec<u8>> {
     let slides: Vec<usize> = match &opts.slides {
@@ -112,10 +142,8 @@ pub fn export(pres: &Presentation, opts: &PdfOptions) -> Result<Vec<u8>> {
     let pages: Vec<Vec<(usize, Rect)>> = match opts.layout {
         PageLayout::Slides => slides.iter().map(|&i| vec![(i, Rect::new(0.0, 0.0, sw, sh))]).collect(),
         PageLayout::Notes => {
-            let (pw, _) = opts.paper;
-            let w = pw - 2.0 * 72.0;
-            let h = w * sh / sw;
-            slides.iter().map(|&i| vec![(i, Rect::new(72.0, 54.0, 72.0 + w, 54.0 + h))]).collect()
+            let b = notes_slide_box(opts.paper, sw / sh);
+            slides.iter().map(|&i| vec![(i, b)]).collect()
         }
         PageLayout::Handouts { per_page } => {
             let boxes = handout_boxes(per_page, opts.paper, sw / sh);
diff --git a/crates/pdf/src/tests.rs b/crates/pdf/src/tests.rs
index 305f1457..2c8cd628 100644
--- a/crates/pdf/src/tests.rs
+++ b/crates/pdf/src/tests.rs
@@ -66,3 +66,36 @@ fn handout_boxes_fit_the_paper() {
         }
     }
 }
+
+/// Notes pages and handouts print on the chosen paper, landscape included, with every slide box
+/// on the page and room left for the notes.
+#[test]
+fn notes_and_handouts_fit_any_paper_and_orientation() {
+    let p = deck(3);
+    for (id, _, _) in PAPERS {
+        for landscape in [false, true] {
+            let paper = paper_size(id, landscape).expect("known paper");
+            assert_eq!(paper.0 > paper.1, landscape, "{id}");
+            let b = notes_slide_box(paper, 16.0 / 9.0);
+            assert!(b.x0 >= 0.0 && b.x1 <= paper.0 && b.y1 <= paper.1 * 0.5, "{id} {landscape}: {b:?}");
+            assert!((b.width() / b.height() - 16.0 / 9.0).abs() < 1e-6);
+            for n in [1, 3, 6, 9] {
+                for r in handout_boxes(n, paper, 16.0 / 9.0) {
+                    assert!(r.x0 >= 0.0 && r.y0 >= 0.0 && r.x1 <= paper.0 && r.y1 <= paper.1, "{id} {landscape} {n}: {r:?}");
+                }
+            }
+            for layout in [PageLayout::Notes, PageLayout::Handouts { per_page: 6 }] {
+                let bytes = export(&p, &PdfOptions { paper, ..opts(layout) }).expect("export");
+                let text = String::from_utf8_lossy(&bytes);
+                let media = format!("/MediaBox[0 0 {} {}]", fmt(paper.0), fmt(paper.1));
+                assert!(text.contains(&media), "{id} {landscape} {layout:?}: no {media}");
+            }
+        }
+    }
+    assert_eq!(paper_size("bogus", false), None);
+}
+
+fn fmt(v: f64) -> String {
+    let s = format!("{:.2}", v as f32);
+    s.trim_end_matches('0').trim_end_matches('.').to_string()
+}
diff --git a/crates/ui-egui/src/backstage.rs b/crates/ui-egui/src/backstage.rs
index f1d0fde3..a2d4653e 100644
--- a/crates/ui-egui/src/backstage.rs
+++ b/crates/ui-egui/src/backstage.rs
@@ -166,6 +166,9 @@ pub struct Backstage {
     pub print_layout: &'static str,
     pub print_hidden: bool,
     pub print_frame: bool,
+    /// Notes and handouts: a paper id from [`deckcraft_engine::cmd::file::PAPERS`] and its orientation.
+    pub print_paper: &'static str,
+    pub print_landscape: bool,
     pub preview_page: usize,
     pub export: ExportTask,
     /// Export › Change File Type / Save As: the chosen type (an [`SAVE_TYPES`] id).
@@ -187,6 +190,8 @@ impl Backstage {
             print_layout: "slides",
             print_hidden: false,
             print_frame: true,
+            print_paper: "letter",
+            print_landscape: false,
             preview_page: 0,
             export: ExportTask::Pdf,
             file_type: "pptx",
@@ -890,7 +895,24 @@ pub fn print_params(bs: &Backstage, slides: &[usize]) -> Value {
         _ => ("slides", 0),
     };
     // The list is already filtered for hidden slides, so the PDF takes it as it is.
-    json!({"layout": layout, "perPage": per, "slides": slides, "includeHidden": true, "frame": bs.print_frame})
+    json!({
+        "layout": layout,
+        "perPage": per,
+        "slides": slides,
+        "includeHidden": true,
+        "frame": bs.print_frame,
+        "paper": bs.print_paper,
+        "orientation": if bs.print_landscape { "landscape" } else { "portrait" },
+    })
+}
+
+/// The printed page size in points: the slide size for full-page slides, else the chosen paper.
+pub fn print_page_size(bs: &Backstage, doc: &deckcraft_model::Presentation) -> (f32, f32) {
+    if bs.print_layout == "slides" {
+        return (doc.slide_size.width as f32, doc.slide_size.height as f32);
+    }
+    let (w, h) = deckcraft_engine::cmd::file::paper_size(bs.print_paper, bs.print_landscape).unwrap_or((612.0, 792.0));
+    (w as f32, h as f32)
 }
 
 const LAYOUTS: [(&str, &str); 8] = [
@@ -968,6 +990,28 @@ fn print(app: &mut SlideApp, ui: &mut Ui, bs: &mut Backstage) {
                 }
             });
             ui.add_space(4.0);
+            // PowerPoint prints full-page slides on slide-shaped pages; paper and orientation are
+            // for notes pages and handouts.
+            ui.add_enabled_ui(bs.print_layout != "slides", |ui| {
+                let paper = deckcraft_engine::cmd::file::PAPERS.iter().find(|p| p.0 == bs.print_paper).map_or("Letter", |p| p.1);
+                egui::ComboBox::from_id_salt("backstage_print_paper").width(240.0).selected_text(paper).show_ui(ui, |ui| {
+                    for (id, label, _) in deckcraft_engine::cmd::file::PAPERS {
+                        if ui.selectable_label(bs.print_paper == id, label).clicked() {
+                            bs.print_paper = id;
+                        }
+                    }
+                });
+                ui.add_space(4.0);
+                let orient = if bs.print_landscape { "Landscape Orientation" } else { "Portrait Orientation" };
+                egui::ComboBox::from_id_salt("backstage_print_orientation").width(240.0).selected_text(orient).show_ui(ui, |ui| {
+                    for (land, label) in [(false, "Portrait Orientation"), (true, "Landscape Orientation")] {
+                        if ui.selectable_label(bs.print_landscape == land, label).clicked() {
+                            bs.print_landscape = land;
+                        }
+                    }
+                });
+            });
+            ui.add_space(4.0);
             if ui.checkbox(&mut bs.print_hidden, "Print Hidden Slides").changed() {
                 bs.preview_page = 0;
             }
@@ -1000,8 +1044,8 @@ fn preview(app: &mut SlideApp, ui: &mut Ui, bs: &mut Backstage, doc: &deckcraft_
     let last = pages.len().saturating_sub(1);
     bs.preview_page = bs.preview_page.min(last);
     let Some(on_page) = pages.get(bs.preview_page).copied() else { return };
-    // Full-page slides print on slide-shaped pages; notes and handouts on portrait Letter.
-    let (pw, ph) = if bs.print_layout == "slides" { (doc.slide_size.width as f32, doc.slide_size.height as f32) } else { (612.0, 792.0) };
+    // Full-page slides print on slide-shaped pages; notes and handouts on the chosen paper.
+    let (pw, ph) = print_page_size(bs, doc);
     let avail_w = ui.available_width().clamp(200.0, 760.0);
     let scale = (avail_w / pw.max(1.0)).min(520.0 / ph.max(1.0));
     let (area, _) = ui.allocate_exact_size(vec2(avail_w, ph * scale + 24.0), Sense::hover());
diff --git a/crates/ui-egui/src/backstage_tests.rs b/crates/ui-egui/src/backstage_tests.rs
index 115d782f..9bf2cd5e 100644
--- a/crates/ui-egui/src/backstage_tests.rs
+++ b/crates/ui-egui/src/backstage_tests.rs
@@ -435,4 +435,13 @@ fn print_slides_follow_the_settings() {
     bs.print_layout = "h6";
     assert_eq!(print_params(&bs, &[1, 3])["perPage"], 6);
     assert_eq!(print_params(&bs, &[1, 3])["layout"], "handouts");
+    assert_eq!(print_params(&bs, &[1])["paper"], "letter");
+    assert_eq!(print_page_size(&bs, &doc), (612.0, 792.0));
+    bs.print_paper = "a4";
+    bs.print_landscape = true;
+    assert_eq!(print_params(&bs, &[1])["orientation"], "landscape");
+    let (w, h) = print_page_size(&bs, &doc);
+    assert!((w - 841.89).abs() < 0.01 && (h - 595.28).abs() < 0.01);
+    bs.print_layout = "slides";
+    assert_eq!(print_page_size(&bs, &doc), (doc.slide_size.width as f32, doc.slide_size.height as f32), "slides print slide-shaped");
 }
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..2812e919 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -157,7 +157,12 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.home", "Home", None, "{on?}"),
     ("app.backstage", "File", Some("Alt+F"), "{page?: home|new|open|info|saveAs|print|export|account, on?: bool}"),
     ("app.closePresentation", "Close", Some("Cmd+W"), "{}"),
-    ("app.print", "Print", Some("Cmd+P"), "{layout?, perPage?, slides?, includeHidden?, frame?}"),
+    (
+        "app.print",
+        "Print",
+        Some("Cmd+P"),
+        "{layout?, perPage?, slides?, includeHidden?, frame?, paper?: letter|a4|legal|a3, orientation?: portrait|landscape}",
+    ),
     ("app.about", "About DeckCraft", None, "{}"),
     ("app.palette", "Command Palette", Some("Cmd+Shift+P"), "{}"),
     ("app.preferences", "Preferences…", Some("Cmd+,"), "{}"),

From 16c5d6a6a36d046c31e44360d96640a481d81523 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:45:42 +0300
Subject: [PATCH 142/376] Format Shape: line compound, cap, join, arrows and
 sizes; lock aspect ratio

The Format Shape pane's Line page had only colour, width and dash. It now
has PowerPoint's compound type, cap type, join type, begin/end arrow type
and begin/end arrow size drop-downs, and the Size page has Lock aspect
ratio for the width and height fields. shape.line gains compound,
headSize and tailSize, and changing an arrow's kind keeps its size.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/shape.rs | 34 ++++++++++++++--
 crates/engine/src/tests.rs     | 24 +++++++++++
 crates/ui-egui/src/panes.rs    | 73 +++++++++++++++++++++++++++++++++-
 docs/ui-parity.md              |  2 +-
 4 files changed, 128 insertions(+), 5 deletions(-)

diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..6ed152c5 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -51,7 +51,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Shape Outline",
             ["Shape Format", "Shape Styles"],
             None,
-            "{color?, none?, width?: pt, dash?: solid|dot|dash|lgDash|dashDot|sysDot|sysDash, cap?, join?, head?: none|triangle|stealth|diamond|oval|arrow, tail?, reset?, ids?}",
+            "{color?, none?, width?: pt, dash?: solid|dot|dash|lgDash|dashDot|sysDot|sysDash, cap?: flat|round|square, join?: round|bevel|miter, compound?: single|double|thickThin|thinThick|triple, head?: none|triangle|stealth|diamond|oval|arrow, tail?, headSize?: sm|med|lg, tailSize?, reset?, ids?}",
             has_selection,
             line
         ),
@@ -350,6 +350,15 @@ fn line(s: &mut Session, p: &Value) -> Result<Value> {
         "square" => deckcraft_model::style::LineCap::Square,
         _ => deckcraft_model::style::LineCap::Flat,
     });
+    let compound = str_param(p, "compound").map(|c| match c {
+        "double" => deckcraft_model::style::Compound::Double,
+        "thickThin" => deckcraft_model::style::Compound::ThickThin,
+        "thinThick" => deckcraft_model::style::Compound::ThinThick,
+        "triple" => deckcraft_model::style::Compound::Triple,
+        _ => deckcraft_model::style::Compound::Single,
+    });
+    let end_size = |k: &str| str_param(p, k).filter(|v| matches!(*v, "sm" | "med" | "lg")).map(str::to_string);
+    let (head_size, tail_size) = (end_size("headSize"), end_size("tailSize"));
     let join = str_param(p, "join").map(|c| match c {
         "bevel" => deckcraft_model::style::LineJoin::Bevel,
         "miter" => deckcraft_model::style::LineJoin::Miter,
@@ -376,11 +385,20 @@ fn line(s: &mut Session, p: &Value) -> Result<Value> {
         if dash.is_some() {
             l.dash.clone_from(&dash);
         }
+        let keep_size = |old: &Option<LineEnd>, new: &Option<LineEnd>| {
+            new.clone().map(|mut n| {
+                if let Some(o) = old {
+                    n.w.clone_from(&o.w);
+                    n.len.clone_from(&o.len);
+                }
+                n
+            })
+        };
         if let Some(h) = &head {
-            l.head.clone_from(h);
+            l.head = keep_size(&l.head, h);
         }
         if let Some(t) = &tail {
-            l.tail.clone_from(t);
+            l.tail = keep_size(&l.tail, t);
         }
         if cap.is_some() {
             l.cap = cap;
@@ -388,6 +406,16 @@ fn line(s: &mut Session, p: &Value) -> Result<Value> {
         if join.is_some() {
             l.join = join;
         }
+        if compound.is_some() {
+            l.compound = compound;
+        }
+        // Arrowhead size (width and length together), kept when the kind changes.
+        for (end, size) in [(&mut l.head, &head_size), (&mut l.tail, &tail_size)] {
+            if let (Some(e), Some(sz)) = (end.as_mut(), size) {
+                e.w.clone_from(sz);
+                e.len.clone_from(sz);
+            }
+        }
         Ok(())
     })
 }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..37d2a4d4 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,27 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn shape_line_sets_compound_and_arrow_sizes() {
+    // The Format Shape pane's Line page: compound type, arrowheads and their sizes.
+    use deckcraft_model::style::Compound;
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "line", "rect": [100, 100, 200, 0]})).unwrap();
+    s.execute("shape.line", &json!({"compound": "thickThin", "head": "oval", "tail": "triangle", "tailSize": "lg"})).unwrap();
+    let line = |s: &Session| s.doc().unwrap().selected_shapes()[0].line.clone().unwrap();
+    let l = line(&s);
+    assert_eq!(l.compound, Some(Compound::ThickThin));
+    assert_eq!(l.head.as_ref().map(|e| (e.kind.as_str(), e.w.as_str())), Some(("oval", "med")));
+    assert_eq!(l.tail.as_ref().map(|e| (e.kind.as_str(), e.w.as_str(), e.len.as_str())), Some(("triangle", "lg", "lg")));
+    // Changing the arrow keeps its size; an unknown size is ignored; "none" removes it.
+    s.execute("shape.line", &json!({"tail": "stealth", "headSize": "huge"})).unwrap();
+    let l = line(&s);
+    assert_eq!(l.tail.as_ref().map(|e| (e.kind.as_str(), e.w.as_str())), Some(("stealth", "lg")));
+    assert_eq!(l.head.as_ref().map(|e| e.w.as_str()), Some("med"));
+    s.execute("shape.line", &json!({"head": "none", "compound": "single"})).unwrap();
+    let l = line(&s);
+    assert!(l.head.is_none());
+    assert_eq!(l.compound, Some(Compound::Single));
+}
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..bdf17829 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -155,11 +155,18 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
             }
         }
         "size" => {
+            let lock_id = egui::Id::new("fmt-lock-aspect");
+            let mut lock: bool = ui.data_mut(|d| d.get_temp(lock_id).unwrap_or(false));
+            let locked = lock;
             let mut fields = |ui: &mut Ui, label: &str, id: &str, v: f64, key: &str, cmd: &str, unit: f64| {
                 ui.horizontal(|ui| {
                     ui.add_sized(vec2(90.0, 20.0), egui::Label::new(label));
                     if let Some(nv) = widgets::spinner(ui, id, v / unit, 0.1, if unit == 72.0 { "\"" } else { "°" }, 70.0) {
-                        run(app, cmd, json!({key: nv * unit}));
+                        let mut p = json!({key: nv * unit});
+                        if cmd == "shape.resize" && locked {
+                            p["lockAspect"] = json!(true);
+                        }
+                        run(app, cmd, p);
                     }
                 });
             };
@@ -167,6 +174,9 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
             fields(ui, "Height", "fh", x.h, "h", "shape.resize", 72.0);
             fields(ui, "Width", "fw", x.w, "w", "shape.resize", 72.0);
             fields(ui, "Rotation", "fr", x.rot, "deg", "shape.rotate", 1.0);
+            if ui.checkbox(&mut lock, "Lock aspect ratio").changed() {
+                ui.data_mut(|d| d.insert_temp(lock_id, lock));
+            }
             ui.add_space(6.0);
             ui.label(egui::RichText::new("Position").font(theme::bold(13.0)));
             fields(ui, "Horizontal", "fx", x.x, "x", "shape.move", 72.0);
@@ -335,6 +345,67 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
                     }
                 }
             });
+            line_details(app, ui, &sh);
+        }
+    }
+}
+
+/// A labelled drop-down on the Format Shape pane: picks one of `items` (label, value) and runs
+/// `shape.line` with `{key: value}`.
+fn line_choice(app: &mut SlideApp, ui: &mut Ui, label: &str, key: &str, current: &str, items: &[(&str, &str)]) {
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(90.0, 20.0), egui::Label::new(label));
+        let shown = items.iter().find(|(_, v)| *v == current).map_or(current, |(l, _)| *l);
+        egui::ComboBox::from_id_salt(("fmt-line", key)).selected_text(shown).width(120.0).show_ui(ui, |ui| {
+            for (l, v) in items {
+                if ui.selectable_label(*v == current, *l).clicked() {
+                    run(app, "shape.line", json!({key: v}));
+                }
+            }
+        });
+    });
+}
+
+/// The rest of PowerPoint's Line page: compound type, cap and join types, and the begin and end
+/// arrows with their sizes.
+fn line_details(app: &mut SlideApp, ui: &mut Ui, sh: &deckcraft_model::Shape) {
+    use deckcraft_model::style::{Compound, LineCap, LineJoin};
+    let l = sh.line.clone().unwrap_or_default();
+    let compound = match l.compound.unwrap_or_default() {
+        Compound::Single => "single",
+        Compound::Double => "double",
+        Compound::ThickThin => "thickThin",
+        Compound::ThinThick => "thinThick",
+        Compound::Triple => "triple",
+    };
+    line_choice(
+        app,
+        ui,
+        "Compound type",
+        "compound",
+        compound,
+        &[("Single", "single"), ("Double", "double"), ("Thick Thin", "thickThin"), ("Thin Thick", "thinThick"), ("Triple", "triple")],
+    );
+    let cap = match l.cap.unwrap_or_default() {
+        LineCap::Flat => "flat",
+        LineCap::Round => "round",
+        LineCap::Square => "square",
+    };
+    line_choice(app, ui, "Cap type", "cap", cap, &[("Flat", "flat"), ("Round", "round"), ("Square", "square")]);
+    let join = match l.join.unwrap_or_default() {
+        LineJoin::Round => "round",
+        LineJoin::Bevel => "bevel",
+        LineJoin::Miter => "miter",
+    };
+    line_choice(app, ui, "Join type", "join", join, &[("Round", "round"), ("Bevel", "bevel"), ("Miter", "miter")]);
+    let arrows = [("None", "none"), ("Arrow", "triangle"), ("Open Arrow", "arrow"), ("Stealth", "stealth"), ("Diamond", "diamond"), ("Oval", "oval")];
+    let sizes = [("Small", "sm"), ("Medium", "med"), ("Large", "lg")];
+    for (label, key, size_label, size_key, end) in
+        [("Begin arrow", "head", "Begin size", "headSize", &l.head), ("End arrow", "tail", "End size", "tailSize", &l.tail)]
+    {
+        line_choice(app, ui, label, key, end.as_ref().map_or("none", |e| e.kind.as_str()), &arrows);
+        if let Some(e) = end {
+            line_choice(app, ui, size_label, size_key, &e.w, &sizes);
         }
     }
 }
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..56502376 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -58,7 +58,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 
 | Pane / dialog | PowerPoint | DeckCraft |
 |---|---|---|
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
+| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line (dash, compound, cap, join, begin/end arrows and sizes), some effects, size (lock aspect ratio); no 3-D, thin picture/texture options |
 | Format Background pane | yes | yes |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |

From 85833cf5f53969494cc8a925561a2861f0aabc1f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:50:23 +0300
Subject: [PATCH 143/376] Engine: seeded editor soak tests; tiny charts no
 longer blank the slide

soak_tests.rs drives every non-file command with plausible and hostile
parameters over a ~100-slide deck, checking after each step that the
document validates, the selection is in range, the undo stack is bounded,
undo then redo restores the exact document, and every 100 steps that the
deck saves and reopens as .deckcraft and .pptx. Four seeds x 400 steps run
in CI (under a second); DECKCRAFT_SOAK_STEPS/SEED run it long.

The long soak found that a chart a few points wide panicked in f64::clamp
(label gutter min above max), and the render guard then blanked the whole
slide. chart.rs now uses a non-panicking clamp_soft for the gutters and the
zero line; a render test draws tiny charts next to a shape without the
guard.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/lib.rs        |   2 +
 crates/engine/src/soak_tests.rs | 179 ++++++++++++++++++++++++++++++++
 crates/render/src/chart.rs      |  13 ++-
 crates/render/src/tests.rs      |  26 +++++
 docs/gaps.md                    |  12 ++-
 5 files changed, 224 insertions(+), 8 deletions(-)
 create mode 100644 crates/engine/src/soak_tests.rs

diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..d6f3f42a 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -551,6 +551,8 @@ pub(crate) fn push_undo(st: &mut DocState, e: HistoryEntry) {
     }
 }
 
+#[cfg(test)]
+mod soak_tests;
 #[cfg(test)]
 mod tests;
 #[cfg(test)]
diff --git a/crates/engine/src/soak_tests.rs b/crates/engine/src/soak_tests.rs
new file mode 100644
index 00000000..9c70d155
--- /dev/null
+++ b/crates/engine/src/soak_tests.rs
@@ -0,0 +1,179 @@
+//! Editor soak: long random command sequences over a big deck, with invariants checked after
+//! every step: no panic, a valid document, an in-range selection, a bounded undo stack, undo then
+//! redo restoring the exact document, and periodic save/reopen in both formats.
+//!
+//! Seeded and deterministic. A failure prints the seed and the last commands so it replays.
+//! `DECKCRAFT_SOAK_STEPS=50000 cargo test -p deckcraft-engine soak -- --ignored` runs a long soak.
+
+use std::collections::VecDeque;
+
+use serde_json::{Value, json};
+
+use crate::*;
+
+/// Commands that touch the file system, other windows or real time; the soak drives the rest.
+fn skipped(id: &str) -> bool {
+    matches!(id, "file.close" | "file.open" | "file.save" | "file.saveAs" | "file.export" | "file.saveTemplate" | "file.openBytes" | "file.new")
+        || id.starts_with("window.")
+        || id.starts_with("show.")
+        || id.starts_with("media.")
+}
+
+/// xorshift64*: tiny, deterministic, no dependency.
+struct Rng(u64);
+
+impl Rng {
+    fn next(&mut self) -> u64 {
+        self.0 ^= self.0 >> 12;
+        self.0 ^= self.0 << 25;
+        self.0 ^= self.0 >> 27;
+        self.0.wrapping_mul(0x2545_F491_4F6C_DD1D)
+    }
+    fn below(&mut self, n: usize) -> usize {
+        if n == 0 { 0 } else { (self.next() % n as u64) as usize }
+    }
+    fn f(&mut self, lo: f64, hi: f64) -> f64 {
+        lo + (self.next() >> 11) as f64 / (1u64 << 53) as f64 * (hi - lo)
+    }
+    fn pick<'a, T>(&mut self, v: &'a [T]) -> Option<&'a T> {
+        v.get(self.below(v.len()))
+    }
+}
+
+fn shape_ids(s: &Session) -> Vec<u64> {
+    s.active().map(|d| d.shapes().iter().map(|x| u64::from(x.id.0)).collect()).unwrap_or_default()
+}
+
+/// Plausible parameters built from the live document, plus the odd hostile value.
+fn params(r: &mut Rng, s: &Session) -> Value {
+    let ids = shape_ids(s);
+    let id = r.pick(&ids).copied().unwrap_or(1);
+    let slides = s.active().map(|d| d.doc.slides.len()).unwrap_or(1);
+    let index = r.below(slides + 2);
+    match r.below(10) {
+        0 => json!({}),
+        1 => json!({"ids": [id]}),
+        2 => json!({"id": id, "text": "Soak ✓ שלום 漢字", "name": "S"}),
+        3 => json!({"index": index, "to": r.below(slides + 1)}),
+        4 => json!({"preset": "rect", "rect": [r.f(0.0, 600.0), r.f(0.0, 400.0), r.f(1.0, 300.0), r.f(1.0, 200.0)]}),
+        5 => json!({"ids": [id], "color": "#3366CC", "size": r.f(1.0, 96.0), "value": r.f(-10.0, 10.0)}),
+        6 => json!({"ids": ids.iter().take(3).collect::<Vec<_>>()}),
+        7 => json!({"effect": "fade", "start": "afterPrevious", "duration": r.below(5000), "delay": r.below(2000)}),
+        8 => json!({"layout": "titleAndContent", "title": "T", "body": "B"}),
+        _ => json!({"index": u64::MAX, "ids": [u64::MAX], "id": -1, "size": 1e308, "rect": [f64::MAX, 0, -1, 0]}),
+    }
+}
+
+fn doc(s: &Session) -> Option<deckcraft_model::Presentation> {
+    s.active().map(|d| (*d.doc).clone())
+}
+
+fn check(s: &Session, seed: u64, step: usize, log: &VecDeque<String>) {
+    let ctx = || format!("seed {seed} step {step}; last commands:\n{}", log.iter().cloned().collect::<Vec<_>>().join("\n"));
+    let Some(d) = s.active() else { panic!("no active document; {}", ctx()) };
+    let problems = d.doc.validate();
+    assert!(problems.is_empty(), "{problems:?}; {}", ctx());
+    assert!(d.selection.slide < d.doc.slides.len().max(1), "selection slide {} of {}; {}", d.selection.slide, d.doc.slides.len(), ctx());
+    assert!(d.history.undo.len() <= d.history.limit.max(1), "undo stack {} over limit; {}", d.history.undo.len(), ctx());
+}
+
+fn soak(seed: u64, steps: usize) {
+    let mut s = Session::new();
+    sample::open_sample(&mut s).unwrap();
+    // A big deck: the sample several times over.
+    for _ in 0..3 {
+        let n = s.doc().unwrap().doc.slides.len();
+        for i in 0..n {
+            let _ = s.execute("slide.duplicate", &json!({"index": i}));
+        }
+    }
+    let ids: Vec<&'static str> = command_specs().iter().map(|c| c.id).filter(|id| !skipped(id)).collect();
+    let mut r = Rng(seed | 1);
+    let mut log: VecDeque<String> = VecDeque::new();
+    let mut edits = 0usize;
+    for step in 0..steps {
+        let id = *r.pick(&ids).unwrap();
+        let p = params(&mut r, &s);
+        log.push_back(format!("{id} {p}"));
+        if log.len() > 20 {
+            log.pop_front();
+        }
+        let before = doc(&s);
+        let undoable = command_specs().iter().any(|c| c.id == id && c.undoable);
+        let res = s.execute(id, &p);
+        if let Err(EngineError::Internal(..)) = &res {
+            panic!("command panicked (caught by the guard): {res:?}; seed {seed} step {step}; {id} {p}");
+        }
+        let ok = res.is_ok();
+        check(&s, seed, step, &log);
+        // Undo then redo of a real edit gets the same document back.
+        let after = doc(&s);
+        if before != after {
+            edits += 1;
+        }
+        if ok && undoable && before != after && r.below(4) == 0 {
+            s.execute("edit.undo", &json!({})).unwrap_or_else(|e| panic!("undo failed: {e}; seed {seed} step {step} {id} {p}"));
+            assert!(doc(&s) == before, "undo didn't restore; seed {seed} step {step} {id} {p}");
+            s.execute("edit.redo", &json!({})).unwrap_or_else(|e| panic!("redo failed: {e}; seed {seed} step {step} {id} {p}"));
+            assert!(doc(&s) == after, "redo didn't reapply; seed {seed} step {step} {id} {p}");
+        }
+        // Keep the deck from vanishing or exploding.
+        let n = s.doc().map(|d| d.doc.slides.len()).unwrap_or(0);
+        if n == 0 || s.documents().len() != 1 {
+            panic!("documents {} slides {n}; seed {seed} step {step}; {log:?}", s.documents().len());
+        }
+        if step % 100 == 99 {
+            for format in ["deckcraft", "pptx"] {
+                let data =
+                    s.execute("file.saveBytes", &json!({"format": format})).unwrap_or_else(|e| panic!("save {format}: {e}; seed {seed} step {step}"));
+                let b64 = data["data"].as_str().unwrap_or_default().to_string();
+                s.execute("file.openBytes", &json!({"name": format!("soak.{format}"), "data": b64}))
+                    .unwrap_or_else(|e| panic!("reopen {format}: {e}; seed {seed} step {step}; {log:?}"));
+                let back = s.doc().unwrap().doc.slides.len();
+                assert_eq!(back, n, "{format} reopen slide count; seed {seed} step {step}");
+                assert!(s.doc().unwrap().doc.validate().is_empty(), "{format} reopen invalid; seed {seed} step {step}");
+                let last = s.documents().len() - 1;
+                s.close_document(last);
+                s.set_active(0);
+            }
+        }
+    }
+    // The soak must really edit, not just bounce off disabled commands.
+    assert!(edits * 10 >= steps, "only {edits} of {steps} steps changed the document; seed {seed}");
+    eprintln!("soak seed {seed}: {edits} of {steps} steps edited");
+}
+
+fn steps(default: usize) -> usize {
+    std::env::var("DECKCRAFT_SOAK_STEPS").ok().and_then(|v| v.parse().ok()).unwrap_or(default)
+}
+
+#[test]
+fn soak_random_edits_keep_the_document_valid() {
+    for seed in [1, 0xDEC0_C2AF, 42, 7_777_777] {
+        soak(seed, steps(400));
+    }
+}
+
+#[test]
+#[ignore = "long soak; set DECKCRAFT_SOAK_STEPS"]
+fn soak_long() {
+    let seed = std::env::var("DECKCRAFT_SOAK_SEED").ok().and_then(|v| v.parse().ok()).unwrap_or(0x5EED);
+    soak(seed, steps(20_000));
+}
+
+#[test]
+fn undo_stack_stays_bounded_and_drains() {
+    let mut s = Session::with_new();
+    let limit = s.doc().unwrap().history.limit;
+    for i in 0..limit + 50 {
+        s.execute("shape.insert", &json!({"preset": "rect", "rect": [i % 500, 10, 20, 20]})).unwrap();
+    }
+    assert_eq!(s.doc().unwrap().history.undo.len(), limit);
+    let mut undone = 0;
+    while s.execute("edit.undo", &json!({})).is_ok() {
+        undone += 1;
+        assert!(undone <= limit, "undo ran past the stack");
+    }
+    assert_eq!(undone, limit);
+    assert!(s.doc().unwrap().doc.validate().is_empty());
+}
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..07fcc5c9 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -264,9 +264,9 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     } else if c.y_hidden {
         base * 0.5
     } else {
-        label_w(false, (min, max, step)).clamp(base * 1.5, area.width() * 0.3)
+        clamp_soft(label_w(false, (min, max, step)), base * 1.5, area.width() * 0.3)
     };
-    let gutter_r = second.filter(|_| !c.y2_hidden).map(|sc| label_w(true, sc).clamp(base * 1.5, area.width() * 0.3)).unwrap_or(0.0);
+    let gutter_r = second.filter(|_| !c.y2_hidden).map(|sc| clamp_soft(label_w(true, sc), base * 1.5, area.width() * 0.3)).unwrap_or(0.0);
     let plot = if horiz {
         Rect::new(area.x0 + gutter, area.y0, area.x1, area.y1 - base * 1.6)
     } else {
@@ -378,7 +378,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             );
         }
     }
-    let zero = to_v(0.0f64.clamp(min, max));
+    let zero = to_v(clamp_soft(0.0, min, max));
     if let Some(bk) = bar_kind {
         let bars: Vec<(usize, &deckcraft_model::chart::Series)> =
             c.series.iter().enumerate().filter(|(_, s)| c.series_kind(s).is_bar_like()).collect();
@@ -526,6 +526,13 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     ctx.stroke_path(&ax);
 }
 
+/// `v` kept within `lo..=hi` without `f64::clamp`'s panic when `lo > hi` (a chart smaller than
+/// its label font) or a bound is NaN: the upper bound wins.
+pub(crate) fn clamp_soft(v: f64, lo: f64, hi: f64) -> f64 {
+    let v = if v < lo { lo } else { v };
+    if v > hi { hi } else { v }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..5b4f3d6f 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1711,3 +1711,29 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
     let (w, h) = ink(deckcraft_model::text::TextDir::Vertical);
     assert!(h > w * 3, "vert: stroke on its side {w}x{h}");
 }
+
+#[test]
+fn tiny_chart_does_not_blank_the_slide() {
+    // A chart a few points wide used to panic in `f64::clamp` (gutter min above max), and the
+    // panic guard then blanked the whole slide. Render directly, without the guard.
+    let red = Shape {
+        id: ShapeId(800),
+        xfrm: Some(Xfrm::new(100.0, 100.0, 200.0, 100.0)),
+        style: Some(ShapeStyle::accent(deckcraft_color::SchemeSlot::Accent1)),
+        ..Default::default()
+    };
+    let mut shapes = vec![red];
+    for (i, k) in [ChartType::Column, ChartType::Bar, ChartType::Line, ChartType::Combo, ChartType::Scatter].iter().enumerate() {
+        shapes.push(Shape {
+            id: ShapeId(801 + i as u32),
+            xfrm: Some(Xfrm::new(500.0 + i as f64 * 5.0, 300.0, 0.9, 0.9)),
+            kind: ShapeKind::Chart(Box::new(Chart::sample(*k))),
+            ..Default::default()
+        });
+    }
+    let p = deck_with(shapes);
+    let img = RENDERER.with(|r| r.borrow_mut().slide(&p, &p.slides[0], 0, &RenderOpts { scale: 1.0, ..Default::default() }));
+    let px = img.pixel(200, 150);
+    assert_ne!(px, [255, 255, 255, 255], "the other shape must still draw");
+    assert_eq!(crate::chart::clamp_soft(5.0, 10.5, 0.276), 0.276);
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..2f9a43bd 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -48,11 +48,13 @@ revision history.
 - **Estimate:** 4–8 h (backend probing outside the process or a safe-mode fallback, a software
   renderer path). Needs a tester with the hardware. **Beta blocker.**
 
-### No soak or long-session testing
-- **Evidence:** unit tests (504), PPTX malformed/fuzz tests and the command panic guard exist; no
-  random command sequences over big decks, no memory or undo-depth soak.
-- **Impact:** unknown crash and slowdown rate in long sessions.
-- **Estimate:** 4–8 h.
+### Soak testing is engine-only
+- **Evidence:** `crates/engine/src/soak_tests.rs` runs seeded random command sequences over a
+  ~100-slide deck (validity, selection, undo/redo exactness, bounded undo, save/reopen in both
+  formats every 100 steps); `DECKCRAFT_SOAK_STEPS` runs it long. It found a chart `clamp` panic
+  that blanked whole slides. Still missing: UI-level (kittest) soak, memory and timing budgets.
+- **Impact:** long-session crash rate is now sampled in CI; slowdowns are not measured.
+- **Estimate:** 2–4 h left.
 
 ## File formats
 

From 14bc6a7ef933a0c980aa797caabc4ade901be91e Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:52:56 +0300
Subject: [PATCH 144/376] Format Shape: shadow, glow and reflection detail
 controls

shape.effects gains shadowProps / glowProps / reflectionProps that adjust
the current effect (or add a default one): shadow colour, transparency,
blur, angle and distance; glow colour, transparency and size; reflection
transparency, size, distance and blur. Values are clamped, non-finite ones
ignored. The Effects page of the Format Shape pane exposes them as sliders
and colour pickers.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/shape.rs | 71 ++++++++++++++++++++++++++-
 crates/engine/src/tests.rs     | 34 +++++++++++++
 crates/ui-egui/src/panes.rs    | 89 ++++++++++++++++++++++++++++++++--
 docs/ui-parity.md              |  2 +-
 4 files changed, 191 insertions(+), 5 deletions(-)

diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..deebeabe 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -60,7 +60,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Shape Effects",
             ["Shape Format", "Shape Styles"],
             None,
-            "{shadow?: none|outer|inner|perspective|{color, blur, dist, dir}, glow?: none|{color, radius}, softEdges?: pt, reflection?: none|tight|half|full, bevel?: none|circle|…, reset?, ids?}",
+            "{shadow?: none|outer|inner|perspective|{color, blur, dist, dir}, glow?: none|{color, radius}, softEdges?: pt, reflection?: none|tight|half|full, bevel?: none|circle|…, shadowProps?: {color?, transparency?: 0..1, blur?: pt, dist?: pt, dir?: deg}, glowProps?: {color?, transparency?, radius?: pt}, reflectionProps?: {transparency?, size?: 0..1, dist?: pt, blur?: pt}, reset?, ids?} (the *Props keys adjust the current effect, adding a default one when there is none)",
             has_selection,
             effects
         ),
@@ -450,6 +450,9 @@ fn effects(s: &mut Session, p: &Value) -> Result<Value> {
         _ => Some(Reflection { blur: 0.5, start_alpha: 0.5, end_alpha: 0.0, end_pos: 0.35, dist: 0.0 }),
     });
     let bevel = str_param(p, "bevel").map(|b| if b == "none" { None } else { Some(b.to_string()) });
+    let shadow_props = p.get("shadowProps").filter(|v| v.is_object()).cloned();
+    let glow_props = p.get("glowProps").filter(|v| v.is_object()).cloned();
+    let refl_props = p.get("reflectionProps").filter(|v| v.is_object()).cloned();
     edit_shapes(s, p, "shape.effects", |sh| {
         if reset {
             sh.effects = None;
@@ -484,10 +487,76 @@ fn effects(s: &mut Session, p: &Value) -> Result<Value> {
         if let Some(b) = &bevel {
             e.bevel.clone_from(b);
         }
+        if let Some(v) = &shadow_props {
+            let slot = if e.inner_shadow.is_some() { &mut e.inner_shadow } else { &mut e.outer_shadow };
+            let mut x = slot.take().or_else(|| shadow_preset(&json!("outer")).flatten()).ok_or_else(|| bad("shape.effects", "no shadow preset"))?;
+            if let Some(c) = v.get("color").and_then(color_value) {
+                let a = x.color.alpha();
+                x.color = with_alpha(c, a);
+            }
+            if let Some(t) = num(v, "transparency") {
+                x.color = with_alpha(x.color.clone(), 1.0 - t.clamp(0.0, 1.0));
+            }
+            if let Some(b) = num(v, "blur") {
+                x.blur = b.clamp(0.0, 100.0);
+            }
+            if let Some(d) = num(v, "dist") {
+                x.dist = d.clamp(0.0, 200.0);
+            }
+            if let Some(d) = num(v, "dir") {
+                x.dir = d.rem_euclid(360.0);
+            }
+            *slot = Some(x);
+        }
+        if let Some(v) = &glow_props {
+            let mut g =
+                e.glow.take().unwrap_or(Glow { color: ColorRef::scheme(SchemeSlot::Accent1).with(ColorTransform::Alpha(40000)), radius: 8.0 });
+            if let Some(c) = v.get("color").and_then(color_value) {
+                let a = g.color.alpha();
+                g.color = with_alpha(c, a);
+            }
+            if let Some(t) = num(v, "transparency") {
+                g.color = with_alpha(g.color.clone(), 1.0 - t.clamp(0.0, 1.0));
+            }
+            if let Some(r) = num(v, "radius") {
+                g.radius = r.clamp(0.0, 150.0);
+            }
+            e.glow = (g.radius > 0.0).then_some(g);
+        }
+        if let Some(v) = &refl_props {
+            let mut r = e.reflection.take().unwrap_or(Reflection { blur: 0.5, start_alpha: 0.5, end_alpha: 0.0, end_pos: 0.35, dist: 0.0 });
+            if let Some(t) = num(v, "transparency") {
+                r.start_alpha = 1.0 - t.clamp(0.0, 1.0);
+            }
+            if let Some(sz) = num(v, "size") {
+                r.end_pos = sz.clamp(0.0, 1.0);
+            }
+            if let Some(d) = num(v, "dist") {
+                r.dist = d.clamp(0.0, 100.0);
+            }
+            if let Some(b) = num(v, "blur") {
+                r.blur = b.clamp(0.0, 100.0);
+            }
+            e.reflection = Some(r);
+        }
         Ok(())
     })
 }
 
+/// A finite number at `key` of an effect's properties.
+fn num(v: &Value, key: &str) -> Option<f64> {
+    v.get(key).and_then(Value::as_f64).filter(|x| x.is_finite())
+}
+
+/// `c` with its alpha set to `a` (0–1); fully opaque drops the transform.
+fn with_alpha(mut c: ColorRef, a: f64) -> ColorRef {
+    c.mods.retain(|m| !matches!(m, ColorTransform::Alpha(_)));
+    if a < 1.0 {
+        c.mods.push(ColorTransform::Alpha((a.clamp(0.0, 1.0) * 100_000.0).round() as i32));
+    }
+    c
+}
+
 /// Theme quick styles: 7 rows (outline only, solid fill variants, intense…) × 6 accents.
 pub fn quick_style_for(index: usize) -> (ShapeStyle, Option<Fill>, Option<Line>) {
     let slots = [
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..df1d37a3 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,37 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn shape_effects_props_adjust_shadow_glow_and_reflection() {
+    // The Format Shape pane's Effects page: shadow, glow and reflection details.
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100]})).unwrap();
+    let fx = |s: &Session| s.doc().unwrap().selected_shapes()[0].effects.clone().unwrap_or_default();
+    // No shadow yet: the props add an outer one and set it.
+    s.execute("shape.effects", &json!({"shadowProps": {"blur": 10, "dist": 6, "dir": 405, "transparency": 0.25, "color": "accent2"}})).unwrap();
+    let sw = fx(&s).outer_shadow.unwrap();
+    assert_eq!((sw.blur, sw.dist, sw.dir), (10.0, 6.0, 45.0));
+    assert!((sw.color.alpha() - 0.75).abs() < 1e-6);
+    // A new colour keeps the transparency; an inner shadow is adjusted in place.
+    s.execute("shape.effects", &json!({"shadowProps": {"color": "accent3"}})).unwrap();
+    assert!((fx(&s).outer_shadow.unwrap().color.alpha() - 0.75).abs() < 1e-6);
+    s.execute("shape.effects", &json!({"shadow": "inner"})).unwrap();
+    s.execute("shape.effects", &json!({"shadowProps": {"blur": 3}})).unwrap();
+    let f = fx(&s);
+    assert!(f.outer_shadow.is_none());
+    assert_eq!(f.inner_shadow.unwrap().blur, 3.0);
+    // Glow: size, colour, transparency; size 0 removes it.
+    s.execute("shape.effects", &json!({"glowProps": {"radius": 12, "transparency": 0.5}})).unwrap();
+    let g = fx(&s).glow.unwrap();
+    assert_eq!(g.radius, 12.0);
+    assert!((g.color.alpha() - 0.5).abs() < 1e-6);
+    s.execute("shape.effects", &json!({"glowProps": {"radius": 0}})).unwrap();
+    assert!(fx(&s).glow.is_none());
+    // Reflection: transparency, size, distance, blur; hostile values are clamped or ignored.
+    s.execute("shape.effects", &json!({"reflectionProps": {"transparency": 0.3, "size": 2.0, "dist": 5, "blur": "x"}})).unwrap();
+    let r = fx(&s).reflection.unwrap();
+    assert!((r.start_alpha - 0.7).abs() < 1e-9);
+    assert_eq!((r.end_pos, r.dist, r.blur), (1.0, 5.0, 0.5));
+}
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..0676472c 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -130,6 +130,26 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
                     }
                 }
             });
+            let fx = sh.effects.clone().unwrap_or_default();
+            let shadow = fx.outer_shadow.as_ref().or(fx.inner_shadow.as_ref());
+            if let Some(sw) = shadow {
+                color_button(app, ui, "Color", None, |c| ("shape.effects".into(), json!({"shadowProps": {"color": c.as_ref().map(cref_param)}})));
+                fx_slider(
+                    app,
+                    ui,
+                    ("shadow", sh.id.0, "t"),
+                    "Transparency",
+                    (1.0 - sw.color.alpha()) * 100.0,
+                    0.0..=100.0,
+                    "%",
+                    "shadowProps",
+                    "transparency",
+                    0.01,
+                );
+                fx_slider(app, ui, ("shadow", sh.id.0, "b"), "Blur", sw.blur, 0.0..=100.0, " pt", "shadowProps", "blur", 1.0);
+                fx_slider(app, ui, ("shadow", sh.id.0, "a"), "Angle", sw.dir, 0.0..=359.0, "°", "shadowProps", "dir", 1.0);
+                fx_slider(app, ui, ("shadow", sh.id.0, "d"), "Distance", sw.dist, 0.0..=200.0, " pt", "shadowProps", "dist", 1.0);
+            }
             ui.add_space(6.0);
             ui.label(egui::RichText::new("Reflection").font(theme::bold(13.0)));
             ui.horizontal_wrapped(|ui| {
@@ -139,11 +159,41 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
                     }
                 }
             });
+            if let Some(r) = &fx.reflection {
+                fx_slider(
+                    app,
+                    ui,
+                    ("refl", sh.id.0, "t"),
+                    "Transparency",
+                    (1.0 - r.start_alpha) * 100.0,
+                    0.0..=100.0,
+                    "%",
+                    "reflectionProps",
+                    "transparency",
+                    0.01,
+                );
+                fx_slider(app, ui, ("refl", sh.id.0, "s"), "Size", r.end_pos * 100.0, 0.0..=100.0, "%", "reflectionProps", "size", 0.01);
+                fx_slider(app, ui, ("refl", sh.id.0, "d"), "Distance", r.dist, 0.0..=100.0, " pt", "reflectionProps", "dist", 1.0);
+                fx_slider(app, ui, ("refl", sh.id.0, "b"), "Blur", r.blur, 0.0..=100.0, " pt", "reflectionProps", "blur", 1.0);
+            }
             ui.add_space(6.0);
             ui.label(egui::RichText::new("Glow").font(theme::bold(13.0)));
-            let mut g = sh.effects.as_ref().and_then(|e| e.glow.as_ref().map(|g| g.radius)).unwrap_or(0.0);
-            if ui.add(egui::Slider::new(&mut g, 0.0..=40.0).text("size (pt)")).drag_stopped() {
-                run(app, "shape.effects", json!({"glow": if g > 0.0 { json!(g) } else { Value::Null }}));
+            let radius = fx.glow.as_ref().map_or(0.0, |g| g.radius);
+            fx_slider(app, ui, ("glow", sh.id.0, "r"), "Size", radius, 0.0..=150.0, " pt", "glowProps", "radius", 1.0);
+            if let Some(g) = &fx.glow {
+                color_button(app, ui, "Color", None, |c| ("shape.effects".into(), json!({"glowProps": {"color": c.as_ref().map(cref_param)}})));
+                fx_slider(
+                    app,
+                    ui,
+                    ("glow", sh.id.0, "t"),
+                    "Transparency",
+                    (1.0 - g.color.alpha()) * 100.0,
+                    0.0..=100.0,
+                    "%",
+                    "glowProps",
+                    "transparency",
+                    0.01,
+                );
             }
             ui.label(egui::RichText::new("Soft Edges").font(theme::bold(13.0)));
             let mut s = sh.effects.as_ref().and_then(|e| e.soft_edge).unwrap_or(0.0);
@@ -339,6 +389,39 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
     }
 }
 
+/// A slider for one property of a shape effect: shows `value` (in display units), and when the
+/// drag ends runs `shape.effects` with `{key: {prop: shown × scale}}`.
+#[allow(clippy::too_many_arguments)]
+fn fx_slider(
+    app: &mut SlideApp,
+    ui: &mut Ui,
+    id: (&str, u32, &str),
+    label: &str,
+    value: f64,
+    range: std::ops::RangeInclusive<f64>,
+    suffix: &str,
+    key: &str,
+    prop: &str,
+    scale: f64,
+) {
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(90.0, 20.0), egui::Label::new(label));
+        // Hold the value while dragging; otherwise follow the shape.
+        let sid = ui.id().with(id);
+        let mut v: f64 = ui.data_mut(|d| d.get_temp(sid)).unwrap_or(value);
+        let r = ui.add(egui::Slider::new(&mut v, range).suffix(suffix).max_decimals(0));
+        if r.dragged() || r.has_focus() {
+            ui.data_mut(|d| d.insert_temp(sid, v));
+        } else {
+            ui.data_mut(|d| d.remove::<f64>(sid));
+        }
+        if r.drag_stopped() || r.lost_focus() || (r.changed() && !r.dragged()) {
+            ui.data_mut(|d| d.remove::<f64>(sid));
+            run(app, "shape.effects", json!({key: {prop: v * scale}}));
+        }
+    });
+}
+
 fn background(app: &mut SlideApp, ui: &mut Ui) {
     let sc = scheme(app);
     let bg = app.session.active().and_then(|d| d.current_slide().and_then(|s| s.background.clone()));
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..c9767c06 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -58,7 +58,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 
 | Pane / dialog | PowerPoint | DeckCraft |
 |---|---|---|
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
+| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, shadow/glow/reflection details (colour, transparency, blur, angle, distance, size), soft edges, size; no 3-D, thin picture/texture options |
 | Format Background pane | yes | yes |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |

From 607ffc55919865236cdeab71d51a00024b828049 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:55:21 +0300
Subject: [PATCH 145/376] Text: set text transparency from Text Fill (#32)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

There was no way to make text see-through: the only Transparency
slider was the shape fill's. The new format.textTransparency command
keeps the text's colour and sets its alpha (replacing any it had, and
dropping it at 0). A run without its own colour takes the colour it
shows now, so inherited placeholder or theme colours stay as they are.
Gradient text gets the alpha on every stop. The Format Shape pane's
Text Options page gains a Text Fill section (colour and Transparency),
and the Shape Format › Text Fill dropdown has the same slider.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/format.rs | 46 ++++++++++++++++++++++++++++++++-
 crates/engine/src/tests.rs      | 33 +++++++++++++++++++++++
 crates/pptx/tests/roundtrip.rs  | 16 ++++++++++++
 crates/ui-egui/src/panes.rs     | 34 ++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs    |  4 +++
 5 files changed, 132 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index c68d1242..5721c4b4 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -4,7 +4,7 @@
 use deckcraft_model::edit as ed;
 use deckcraft_model::resolve;
 use deckcraft_model::text::{Align, Anchor, AutoFit, Bullet, Caps, ParaProps, RunProps, Spacing, Strike, TextDir};
-use deckcraft_model::{Effects, Fill, Line, Shape};
+use deckcraft_model::{ColorRef, ColorTransform, Effects, Fill, Line, SchemeSlot, Shape};
 use serde_json::{Value, json};
 
 use super::text::{format_body, format_para, format_run};
@@ -48,6 +48,15 @@ pub fn specs() -> Vec<CommandSpec> {
             has_text_or_shapes,
             color
         ),
+        cmd!(
+            "format.textTransparency",
+            "Text Transparency",
+            ["Shape Format", "WordArt Styles"],
+            None,
+            "{value: 0..1} — 0 opaque, 1 invisible; keeps the text's colour (inherited colours included)",
+            has_text_or_shapes,
+            text_transparency
+        ),
         cmd!("format.highlight", "Text Highlight Color", ["Home", "Font"], None, "{color? (absent = none)}", has_text_or_shapes, highlight),
         cmd!(
             "format.case",
@@ -293,6 +302,41 @@ fn color(s: &mut Session, p: &Value) -> Result<Value> {
     let c = color_param(p, "color").ok_or_else(|| bad("format.color", "missing or invalid `color`"))?;
     format_run(s, &move |r| r.fill = Some(Fill::solid(c.clone())))
 }
+/// `a:alpha` for `transparency` (0–1) on `c`, replacing any alpha it had; fully opaque drops it.
+fn with_transparency(c: &mut ColorRef, transparency: f64) {
+    c.mods.retain(|m| !matches!(m, ColorTransform::Alpha(_)));
+    if transparency > 0.0 {
+        c.mods.push(ColorTransform::Alpha(((1.0 - transparency) * 100_000.0).round() as i32));
+    }
+}
+
+/// Text Fill › Transparency: the text keeps its colour and gets an alpha. A run without its own
+/// fill takes the colour it shows now (from the placeholder, master or theme) so only its
+/// opacity changes.
+fn text_transparency(s: &mut Session, p: &Value) -> Result<Value> {
+    let v = f64_param(p, "value").ok_or_else(|| bad("format.textTransparency", "missing `value` (0–1)"))?;
+    if !v.is_finite() {
+        return Err(bad("format.textTransparency", "`value` must be a number from 0 to 1"));
+    }
+    let v = v.clamp(0.0, 1.0);
+    let shown = match current_run(s).fill {
+        Some(f @ (Fill::Solid { .. } | Fill::Gradient(_))) => f,
+        _ => Fill::solid(ColorRef::scheme(SchemeSlot::Tx1)),
+    };
+    format_run(s, &move |r| {
+        let mut f = match &r.fill {
+            Some(f @ (Fill::Solid { .. } | Fill::Gradient(_))) => f.clone(),
+            Some(Fill::None) => return,
+            _ => shown.clone(),
+        };
+        match &mut f {
+            Fill::Solid { color } => with_transparency(color, v),
+            Fill::Gradient(g) => g.stops.iter_mut().for_each(|st| with_transparency(&mut st.color, v)),
+            _ => {}
+        }
+        r.fill = Some(f);
+    })
+}
 fn highlight(s: &mut Session, p: &Value) -> Result<Value> {
     let c = color_param(p, "color");
     format_run(s, &move |r| r.highlight = c.clone())
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..800d0f8a 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,36 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// Text Fill › Transparency (#32): the text keeps its colour, own or inherited, and gets an alpha;
+/// 0 makes it opaque again, and it is one undo step.
+#[test]
+fn text_transparency_keeps_the_colour_and_sets_alpha() {
+    use deckcraft_model::{ColorTransform, Fill};
+    let mut s = session();
+    let r = s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100], "text": "Hi"})).unwrap();
+    let id = deckcraft_model::ShapeId(r["id"].as_u64().unwrap() as u32);
+    let fill = |s: &Session| {
+        let st = s.doc().unwrap();
+        st.shape(id).unwrap().text.as_ref().unwrap().paragraphs[0].runs[0].props.fill.clone()
+    };
+    // Inherited colour: the run gets the colour it showed, now 25% transparent.
+    s.execute("format.textTransparency", &json!({"value": 0.25})).unwrap();
+    let Some(Fill::Solid { color }) = fill(&s) else { panic!("solid fill expected: {:?}", fill(&s)) };
+    assert!((color.alpha() - 0.75).abs() < 1e-9, "{color:?}");
+    // Its own colour stays; the alpha is replaced, not stacked.
+    s.execute("format.color", &json!({"color": "#C00000"})).unwrap();
+    s.execute("format.textTransparency", &json!({"value": 0.6})).unwrap();
+    s.execute("format.textTransparency", &json!({"value": 0.5})).unwrap();
+    let Some(Fill::Solid { color }) = fill(&s) else { panic!() };
+    assert_eq!(color.base, deckcraft_model::ColorBase::Rgb { rgb: deckcraft_model::Rgba::rgb(0xC0, 0, 0) });
+    assert_eq!(color.mods.iter().filter(|m| matches!(m, ColorTransform::Alpha(_))).count(), 1);
+    assert!((color.alpha() - 0.5).abs() < 1e-9);
+    s.execute("format.textTransparency", &json!({"value": 0})).unwrap();
+    let Some(Fill::Solid { color }) = fill(&s) else { panic!() };
+    assert!(color.mods.is_empty(), "opaque drops the alpha: {color:?}");
+    s.execute("edit.undo", &json!({})).unwrap();
+    let Some(Fill::Solid { color }) = fill(&s) else { panic!() };
+    assert!((color.alpha() - 0.5).abs() < 1e-9);
+    assert!(s.execute("format.textTransparency", &json!({})).is_err());
+}
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..20f12696 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,19 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+/// Text transparency (#32) is `a:alpha` on the run's colour, and survives a save.
+#[test]
+fn text_transparency_round_trips() {
+    use deckcraft_engine::Session;
+    let mut s = Session::with_new();
+    s.execute("shape.insert", &serde_json::json!({"preset": "rect", "rect": [100, 100, 200, 100], "text": "Hi"})).unwrap();
+    s.execute("format.color", &serde_json::json!({"color": "#336699"})).unwrap();
+    s.execute("format.textTransparency", &serde_json::json!({"value": 0.4})).unwrap();
+    let doc = s.doc().unwrap().doc.clone();
+    let bytes = deckcraft_pptx::export(&doc).unwrap();
+    let back = deckcraft_pptx::import(&bytes).unwrap();
+    let sh = back.slides[0].shapes.iter().find(|sh| sh.text.as_ref().is_some_and(|t| t.text().contains("Hi"))).unwrap();
+    let Some(deckcraft_model::Fill::Solid { color }) = &sh.text.as_ref().unwrap().paragraphs[0].runs[0].props.fill else { panic!() };
+    assert!((color.alpha() - 0.6).abs() < 1e-9, "{color:?}");
+}
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..3c1d83a2 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -182,6 +182,13 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
             ui.data_mut(|d| d.insert_temp(id, alt));
         }
         "text" => {
+            ui.label(egui::RichText::new("Text Fill").font(theme::bold(13.0)));
+            color_button(app, ui, "Color", None, |c| match c {
+                Some(c) => ("format.color".into(), json!({"color": cref_param(&c)})),
+                None => ("format.color".into(), json!({"color": "tx1"})),
+            });
+            text_transparency_slider(app, ui, &sh);
+            ui.add_space(6.0);
             ui.label(egui::RichText::new("Text Box").font(theme::bold(13.0)));
             ui.horizontal(|ui| {
                 ui.label("Vertical alignment");
@@ -635,3 +642,30 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
         ui.add_space(8.0);
     }
 }
+
+/// The transparency (0–1) of a shape's first text run as stored on it.
+pub(crate) fn text_transparency_of(sh: &deckcraft_model::Shape) -> f64 {
+    let run = sh.text.as_ref().and_then(|t| t.paragraphs.iter().flat_map(|p| p.runs.iter()).next());
+    match run.and_then(|r| r.props.fill.as_ref()) {
+        Some(Fill::Solid { color }) => 1.0 - color.alpha(),
+        Some(Fill::Gradient(g)) => g.stops.first().map_or(0.0, |s| 1.0 - s.color.alpha()),
+        _ => 0.0,
+    }
+}
+
+/// Text Fill › Transparency, as in PowerPoint's Format Shape › Text Options (#32).
+pub(crate) fn text_transparency_slider(app: &mut SlideApp, ui: &mut Ui, sh: &deckcraft_model::Shape) {
+    ui.horizontal(|ui| {
+        ui.label("Transparency");
+        let id = ui.id().with(("text-transparency", sh.id));
+        let stored = (text_transparency_of(sh) * 100.0) as f32;
+        let mut v: f32 = ui.data_mut(|d| d.get_temp(id).unwrap_or(stored));
+        let r = ui.add(egui::Slider::new(&mut v, 0.0..=100.0).suffix("%"));
+        if r.drag_stopped() || r.lost_focus() || (r.changed() && !r.dragged()) {
+            let _ = app.run("format.textTransparency", json!({"value": v as f64 / 100.0}));
+            ui.data_mut(|d| d.remove::<f32>(id));
+        } else if r.dragged() {
+            ui.data_mut(|d| d.insert_temp(id, v));
+        }
+    });
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..8a5bbf50 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1943,6 +1943,10 @@ fn shape_format(app: &mut SlideApp, ui: &mut Ui) {
                     if let Some(Some(c)) = widgets::color_grid(ui, &sc, None) {
                         run(app, "format.color", json!({"color": cref_param(&c)}));
                     }
+                    if let Some(sh) = app.session.active().and_then(|d| d.selected_shapes().first().map(|s| (*s).clone())) {
+                        ui.separator();
+                        crate::panes::text_transparency_slider(app, ui, &sh);
+                    }
                 });
             }
             let (_, a) = small_button_ex(ui, Icon::TextOutline, "Text Outline", sel, false, true);

From 283b30f12d0c1fb5b828e4803f19a5337e7d46e9 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 21:58:35 +0300
Subject: [PATCH 146/376] UI: WordArt Transform gallery applies a text warp
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Shape Format ▸ Text Effects lists the 40 prstTxWarp presets and
No Transform. format.textWarp sets or clears that warp on the
selected text, with optional adjust values.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                      |   3 +-
 crates/engine/src/cmd/format.rs |  39 ++++++++++++
 crates/engine/src/tests.rs      |  28 +++++++++
 crates/geom/src/warp.rs         |  52 ++++++++++++++++
 crates/geom/src/warp/tests.rs   |  60 +++++-------------
 crates/ui-egui/src/ribbon.rs    | 104 +++++++++++++++++++++++++++++++-
 docs/gaps.md                    |  16 ++---
 docs/roadmap.md                 |   5 +-
 docs/target-app-parity.md       |   5 +-
 docs/ui-parity.md               |   4 +-
 10 files changed, 257 insertions(+), 59 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..0104a23f 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt Transform gallery; previous: hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | WordArt Transform: Shape Format ▸ Text Effects shows the 40 text warps and No Transform; `format.textWarp` applies one to the selected text. Adjust handles are still open |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index c68d1242..7a25474d 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -79,6 +79,15 @@ pub fn specs() -> Vec<CommandSpec> {
             has_text_or_shapes,
             text_outline
         ),
+        cmd!(
+            "format.textWarp",
+            "Text Transform",
+            ["Shape Format", "WordArt Styles"],
+            None,
+            "{preset: a prstTxWarp name or none, adj?: [finite raw guide values, at most 8]} — none clears the transform; omitted adj uses the preset's defaults",
+            has_text_or_shapes,
+            text_warp
+        ),
         cmd!(
             "format.align",
             "Align",
@@ -335,6 +344,36 @@ fn text_outline(s: &mut Session, p: &Value) -> Result<Value> {
     format_run(s, &move |r| r.outline = c.clone().map(|c| Line::solid(c, w)))
 }
 
+fn text_warp(s: &mut Session, p: &Value) -> Result<Value> {
+    let preset = str_param(p, "preset").ok_or_else(|| bad("format.textWarp", "missing `preset`"))?;
+    let clear = preset == "none" || preset == "textNoShape";
+    if !clear && !deckcraft_geom::warp::is_supported(preset) {
+        return Err(bad("format.textWarp", format!("unknown text transform `{preset}`")));
+    }
+    let adj = match p.get("adj") {
+        None => Vec::new(),
+        Some(Value::Array(arr)) => {
+            if arr.len() > 8 {
+                return Err(bad("format.textWarp", "at most 8 adjust values"));
+            }
+            let mut v = Vec::with_capacity(arr.len());
+            for a in arr {
+                let Some(n) = a.as_f64().filter(|n| n.is_finite()) else {
+                    return Err(bad("format.textWarp", "adjust values must be finite numbers"));
+                };
+                v.push(n.clamp(-2.0e9, 2.0e9));
+            }
+            v
+        }
+        Some(_) => return Err(bad("format.textWarp", "`adj` must be an array of numbers")),
+    };
+    let stored = if clear { None } else { Some(preset.to_string()) };
+    format_body(s, &|b| {
+        b.warp.clone_from(&stored);
+        b.warp_adj.clone_from(&adj);
+    })
+}
+
 fn case(s: &mut Session, p: &Value) -> Result<Value> {
     let mode = str_param(p, "mode").unwrap_or("cycle").to_string();
     let st = s.doc()?;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..d015b2c7 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -25,6 +25,34 @@ fn new_presentation_and_slides() {
     assert_eq!(s.doc().unwrap().doc.slides.len(), 3);
 }
 
+#[test]
+fn text_transform_sets_and_clears_a_warp() {
+    let mut s = session();
+    let r = s.execute("shape.insert", &json!({"preset": "rect", "rect": [80.0, 80.0, 420.0, 160.0], "text": "ARCH"})).unwrap();
+    let id = r["id"].as_u64().unwrap();
+    let body = |s: &mut Session| s.execute("shape.inspect", &json!({"id": id})).unwrap()["shape"]["text"]["body"].clone();
+    assert!(s.execute("format.textWarp", &json!({})).is_err());
+    assert!(s.execute("format.textWarp", &json!({"preset": "notAWarp"})).is_err());
+    assert!(s.execute("format.textWarp", &json!({"preset": "textArchUp", "adj": "wide"})).is_err());
+    assert!(s.execute("format.textWarp", &json!({"preset": "textArchUp", "adj": [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0]})).is_err());
+    assert!(s.execute("format.textWarp", &json!({"preset": "textArchUp", "adj": [null]})).is_err());
+    assert!(body(&mut s)["warp"].is_null());
+    s.execute("format.textWarp", &json!({"preset": "textArchUp"})).unwrap();
+    assert_eq!(body(&mut s)["warp"], "textArchUp");
+    assert!(body(&mut s).get("warpAdj").is_none());
+    s.execute("format.textWarp", &json!({"preset": "textInflate", "adj": [20_000.0]})).unwrap();
+    let b = body(&mut s);
+    assert_eq!(b["warp"], "textInflate");
+    assert_eq!(b["warpAdj"], json!([20_000.0]));
+    s.execute("format.textWarp", &json!({"preset": "none"})).unwrap();
+    assert!(body(&mut s)["warp"].is_null());
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(body(&mut s)["warp"], "textInflate");
+    s.execute("text.edit", &json!({"id": id})).unwrap();
+    s.execute("format.textWarp", &json!({"preset": "textCircle"})).unwrap();
+    assert_eq!(body(&mut s)["warp"], "textCircle");
+}
+
 #[test]
 fn insert_shape_and_format() {
     let mut s = session();
diff --git a/crates/geom/src/warp.rs b/crates/geom/src/warp.rs
index acdee999..17575461 100644
--- a/crates/geom/src/warp.rs
+++ b/crates/geom/src/warp.rs
@@ -234,6 +234,58 @@ pub fn is_supported(name: &str) -> bool {
     !adjust_defaults(name).is_empty()
 }
 
+/// One DrawingML text-warp preset, in gallery order.
+pub struct Preset {
+    /// `prstTxWarp` value, e.g. `textArchUp`.
+    pub id: &'static str,
+    /// Name shown on the Transform gallery tile.
+    pub label: &'static str,
+}
+
+/// The 40 presets DeckCraft draws, Follow Path first, then Warp.
+pub const CATALOG: &[Preset] = &[
+    Preset { id: "textArchUp", label: "Arch Up" },
+    Preset { id: "textArchDown", label: "Arch Down" },
+    Preset { id: "textCircle", label: "Circle" },
+    Preset { id: "textButton", label: "Button" },
+    Preset { id: "textPlain", label: "Plain" },
+    Preset { id: "textStop", label: "Stop" },
+    Preset { id: "textTriangle", label: "Triangle" },
+    Preset { id: "textTriangleInverted", label: "Inverted Triangle" },
+    Preset { id: "textChevron", label: "Chevron" },
+    Preset { id: "textChevronInverted", label: "Inverted Chevron" },
+    Preset { id: "textRingInside", label: "Ring Inside" },
+    Preset { id: "textRingOutside", label: "Ring Outside" },
+    Preset { id: "textArchUpPour", label: "Arch Up Pour" },
+    Preset { id: "textArchDownPour", label: "Arch Down Pour" },
+    Preset { id: "textCirclePour", label: "Circle Pour" },
+    Preset { id: "textButtonPour", label: "Button Pour" },
+    Preset { id: "textCurveUp", label: "Curve Up" },
+    Preset { id: "textCurveDown", label: "Curve Down" },
+    Preset { id: "textCanUp", label: "Can Up" },
+    Preset { id: "textCanDown", label: "Can Down" },
+    Preset { id: "textWave1", label: "Wave 1" },
+    Preset { id: "textWave2", label: "Wave 2" },
+    Preset { id: "textDoubleWave1", label: "Double Wave 1" },
+    Preset { id: "textWave4", label: "Wave 4" },
+    Preset { id: "textInflate", label: "Inflate" },
+    Preset { id: "textDeflate", label: "Deflate" },
+    Preset { id: "textInflateBottom", label: "Inflate Bottom" },
+    Preset { id: "textDeflateBottom", label: "Deflate Bottom" },
+    Preset { id: "textInflateTop", label: "Inflate Top" },
+    Preset { id: "textDeflateTop", label: "Deflate Top" },
+    Preset { id: "textDeflateInflate", label: "Deflate Inflate" },
+    Preset { id: "textDeflateInflateDeflate", label: "Deflate Inflate Deflate" },
+    Preset { id: "textFadeRight", label: "Fade Right" },
+    Preset { id: "textFadeLeft", label: "Fade Left" },
+    Preset { id: "textFadeUp", label: "Fade Up" },
+    Preset { id: "textFadeDown", label: "Fade Down" },
+    Preset { id: "textSlantUp", label: "Slant Up" },
+    Preset { id: "textSlantDown", label: "Slant Down" },
+    Preset { id: "textCascadeUp", label: "Cascade Up" },
+    Preset { id: "textCascadeDown", label: "Cascade Down" },
+];
+
 /// Segments of a guide in unit coordinates (x, y in 0..1 over the text rectangle).
 #[derive(Clone, Copy, Debug)]
 enum Seg {
diff --git a/crates/geom/src/warp/tests.rs b/crates/geom/src/warp/tests.rs
index 2d18b13a..7a2c3a14 100644
--- a/crates/geom/src/warp/tests.rs
+++ b/crates/geom/src/warp/tests.rs
@@ -1,48 +1,5 @@
 use super::*;
 
-const ALL: &[&str] = &[
-    "textPlain",
-    "textStop",
-    "textTriangle",
-    "textTriangleInverted",
-    "textChevron",
-    "textChevronInverted",
-    "textRingInside",
-    "textRingOutside",
-    "textArchUp",
-    "textArchDown",
-    "textCircle",
-    "textButton",
-    "textArchUpPour",
-    "textArchDownPour",
-    "textCirclePour",
-    "textButtonPour",
-    "textCurveUp",
-    "textCurveDown",
-    "textCanUp",
-    "textCanDown",
-    "textWave1",
-    "textWave2",
-    "textDoubleWave1",
-    "textWave4",
-    "textInflate",
-    "textDeflate",
-    "textInflateBottom",
-    "textDeflateBottom",
-    "textInflateTop",
-    "textDeflateTop",
-    "textDeflateInflate",
-    "textDeflateInflateDeflate",
-    "textFadeRight",
-    "textFadeLeft",
-    "textFadeUp",
-    "textFadeDown",
-    "textSlantUp",
-    "textSlantDown",
-    "textCascadeUp",
-    "textCascadeDown",
-];
-
 const W: f64 = 420.0;
 const H: f64 = 200.0;
 
@@ -77,9 +34,22 @@ fn corners(name: &str, adj: &[f64], tl: (f64, f64), tr: (f64, f64), bl: (f64, f6
     }
 }
 
+#[test]
+fn catalog_is_the_forty_drawn_presets() {
+    assert_eq!(CATALOG.len(), 40);
+    let mut seen = std::collections::BTreeSet::new();
+    for p in CATALOG {
+        assert!(seen.insert(p.id), "duplicate {}", p.id);
+        assert!(!p.label.is_empty(), "{}", p.id);
+        assert!(is_supported(p.id), "{}", p.id);
+        assert_eq!(is_follow(p.id), matches!(p.id, "textArchUp" | "textArchDown" | "textCircle" | "textButton"), "{}", p.id);
+    }
+}
+
 #[test]
 fn every_preset_builds_finite_guides() {
-    for name in ALL {
+    for p in CATALOG {
+        let name = p.id;
         assert!(is_supported(name), "{name}");
         let w = warp(name, &[], rect()).unwrap_or_else(|| panic!("{name}"));
         assert!(!w.bands.is_empty(), "{name}");
@@ -281,7 +251,7 @@ fn hostile_adjusts_and_boxes_stay_finite() {
         WarpLine { ink: None, extent: (5.0, 5.0), ref_y: 3.0 },
         WarpLine { ink: Some(Rect::new(-1e6, -5.0, 1e6, 5.0)), extent: (-1e6, 1e6), ref_y: 4.0 },
     ];
-    for name in ALL {
+    for name in CATALOG.iter().map(|p| p.id) {
         for adj in adjs {
             for r in rects {
                 let Some(w) = warp(name, adj, r) else { panic!("{name} {adj:?} {r:?}") };
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..e358824d 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1874,6 +1874,105 @@ fn view(app: &mut SlideApp, ui: &mut Ui) {
 
 // ---------- contextual tabs ----------
 
+/// Shape Format ▸ Text Effects ▸ Transform: No Transform, Follow Path, then the other presets.
+fn transform_gallery(app: &mut SlideApp, ui: &mut Ui) {
+    let current = selected_warp(app);
+    ui.label(egui::RichText::new("Transform").font(theme::bold(12.0)));
+    ui.label("Follow Path");
+    let mut picked = false;
+    ui.horizontal_wrapped(|ui| {
+        ui.spacing_mut().item_spacing = vec2(2.0, 2.0);
+        for p in deckcraft_geom::warp::CATALOG.iter().filter(|p| deckcraft_geom::warp::is_follow(p.id)) {
+            if warp_tile(ui, p.id, p.label, current.as_deref() == Some(p.id)) {
+                run(app, "format.textWarp", json!({"preset": p.id}));
+                picked = true;
+            }
+        }
+    });
+    ui.label("Warp");
+    egui::ScrollArea::vertical().max_height(220.0).id_salt("text_warp_gallery").show(ui, |ui| {
+        ui.horizontal_wrapped(|ui| {
+            ui.spacing_mut().item_spacing = vec2(2.0, 2.0);
+            if warp_tile(ui, "", "No Transform", current.is_none()) {
+                run(app, "format.textWarp", json!({"preset": "none"}));
+                picked = true;
+            }
+            for p in deckcraft_geom::warp::CATALOG.iter().filter(|p| !deckcraft_geom::warp::is_follow(p.id)) {
+                if warp_tile(ui, p.id, p.label, current.as_deref() == Some(p.id)) {
+                    run(app, "format.textWarp", json!({"preset": p.id}));
+                    picked = true;
+                }
+            }
+        });
+    });
+    if picked {
+        ui.close();
+    }
+}
+
+fn selected_warp(app: &SlideApp) -> Option<String> {
+    let doc = app.session.active()?;
+    let id = doc.selection.text.as_ref().map(|t| t.shape).or_else(|| doc.selection.shapes.first().copied())?;
+    doc.shape(id)?.text.as_ref()?.body.warp.clone()
+}
+
+fn warp_tile(ui: &mut Ui, preset: &str, label: &str, selected: bool) -> bool {
+    let t = Tokens::get(ui.ctx());
+    let (rect, resp) = ui.allocate_exact_size(vec2(34.0, 28.0), Sense::click());
+    if selected {
+        ui.painter().rect_filled(rect, CornerRadius::same(3), t.selected);
+    } else if resp.hovered() {
+        ui.painter().rect_filled(rect, CornerRadius::same(3), t.hover);
+    }
+    paint_warp_icon(ui.painter(), rect.shrink(4.0), (!preset.is_empty()).then_some(preset), t.text);
+    resp.on_hover_text(label).clicked()
+}
+
+/// The preset's guides, or two straight lines for No Transform.
+fn paint_warp_icon(p: &egui::Painter, r: Rect, name: Option<&str>, color: Color32) {
+    let Some(name) = name else {
+        let y0 = r.min.y + r.height() * 0.32;
+        let y1 = r.min.y + r.height() * 0.68;
+        p.line_segment([pos2(r.min.x, y0), pos2(r.max.x, y0)], Stroke::new(1.0, color));
+        p.line_segment([pos2(r.min.x, y1), pos2(r.max.x, y1)], Stroke::new(1.0, color));
+        return;
+    };
+    let rect = deckcraft_geom::Rect::new((r.min.x + 1.0) as f64, (r.min.y + 1.0) as f64, (r.max.x - 1.0) as f64, (r.max.y - 1.0) as f64);
+    let Some(w) = deckcraft_geom::warp::warp(name, &[], rect) else { return };
+    for band in &w.bands {
+        match band {
+            deckcraft_geom::warp::Band::Fill { top, bottom } => {
+                stroke_guide(p, top, color);
+                stroke_guide(p, bottom, color);
+            }
+            deckcraft_geom::warp::Band::Follow { path, .. } => stroke_guide(p, path, color),
+        }
+    }
+}
+
+fn stroke_guide(p: &egui::Painter, g: &deckcraft_geom::warp::Guide, color: Color32) {
+    let len = g.length();
+    if !(len.is_finite() && len > 1.0) {
+        return;
+    }
+    let n = 20i32;
+    let mut pts = Vec::with_capacity((n + 1) as usize);
+    for i in 0..=n {
+        let (q, _) = g.at(len * f64::from(i) / f64::from(n));
+        if q.x.is_finite() && q.y.is_finite() {
+            pts.push(pos2(q.x as f32, q.y as f32));
+        }
+    }
+    if pts.len() >= 2 {
+        p.add(egui::Shape::Path(egui::epaint::PathShape {
+            points: pts,
+            closed: false,
+            fill: Color32::TRANSPARENT,
+            stroke: Stroke::new(1.0, color).into(),
+        }));
+    }
+}
+
 fn shape_format(app: &mut SlideApp, ui: &mut Ui) {
     let sc = scheme(app);
     let sel = enabled(app, "shape.fill");
@@ -1954,10 +2053,13 @@ fn shape_format(app: &mut SlideApp, ui: &mut Ui) {
                 });
             }
             let r = small_button(ui, Icon::TextEffects, "Text Effects", sel, false);
-            egui::Popup::menu(&r).show(|ui| {
+            egui::Popup::menu(&r).width(312.0).show(|ui| {
                 if ui.button("Shadow").clicked() {
                     run(app, "format.textShadow", json!({}));
+                    ui.close();
                 }
+                ui.separator();
+                transform_gallery(app, ui);
             });
         });
     });
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..4d98e305 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt Transform gallery applies a text warp; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -166,12 +166,13 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 
 ### Edit points, text warp, 3-D
 - **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
-  `prstTxWarp` presets render and their adjusts round-trip, but there is no Transform gallery or
-  command to apply one, no adjust handles, and arc/circle placement can differ from PowerPoint by
-  1–3 % of the path length), "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting
-  render as approximations and `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces,
-  only the three-point rig, and no command or pane to apply 3-D).
-- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
+  `prstTxWarp` presets render, their adjusts round-trip, and Shape Format ▸ Text Effects ▸
+  Transform applies one with `format.textWarp`; still open are adjust handles, and arc/circle
+  placement can differ from PowerPoint by 1–3 % of the path length), "Bevel and 3-D rotation"
+  (partial: bevels, camera presets and rotations and face lighting render as approximations and
+  `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces, only the three-point rig, and
+  no command or pane to apply 3-D).
+- **Estimate:** 4–6 h (edit points), 1–2 h (warp adjust handles), 6–10 h (3-D extrusion,
   rigs and materials, Format Shape page).
 
 ### Proofing: spelling, thesaurus, AutoCorrect
@@ -256,6 +257,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | WordArt Transform gallery: Shape Format ▸ Text Effects lists the 40 presets and No Transform; `format.textWarp` applies one (adjust handles still open) |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..cfeff9a5 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (M9 text warps narrowed to adjust handles; the Transform gallery applies a preset) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -79,7 +79,7 @@ From the local execution plan (`plan/execution-plan.md`, gitignored). Status as
 | M6 | Transitions and animations | mostly | Animation Pane timeline, remaining effects, transition sounds |
 | M7 | Slide show | mostly | second-display placement, laser, record |
 | M8 | Tables and charts | partly | chart data grid, elements, chartex types, draw table |
-| M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), text warps |
+| M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), warp adjust handles |
 | M10 | Views | done | grid options, New Window |
 | M11 | Output | partly | vector PDF, SVG, GIF, MP4, print |
 | M12 | Review | partly | dictionaries, AutoCorrect, find/replace dialog, compare |
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | M9: the WordArt Transform gallery applies a text warp; adjust handles stay open |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..177e004c 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (text-warp shortfall is adjust handles; the Transform gallery applies a preset) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -184,7 +184,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Slides and sections | 6 | 90% | ~85% | 3–5 | Zoom (summary/section/slide), copying slides between decks keeps formatting only partly | [parity-checklist.md](parity-checklist.md) |
 | Views | 4 | 90% | ~80% | 3–6 | Snap to grid and grid options, New Window | [ui-parity.md](ui-parity.md) |
 | Masters and themes | 7 | 85% | ~70% | 8–14 | Notes and Handout masters, theme variants, `.thmx`, effect schemes | [parity-checklist.md](parity-checklist.md) |
-| Shapes | 7 | 86% | ~75% | 8–14 | Edit points, text warp, WordArt depth | [ui-parity.md](ui-parity.md) |
+| Shapes | 7 | 86% | ~75% | 8–14 | Edit points, warp adjust handles, WordArt depth | [ui-parity.md](ui-parity.md) |
 | Format (fill, line, effects) | 6 | 81% | ~65% | 8–14 | Format Shape pane depth, bevel and 3-D, picture/texture fill options | [ui-parity.md](ui-parity.md) |
 | Arrange | 3 | 100% | ~90% | 1–2 | Align to slide vs selected as a menu choice, More Rotation Options | [ui-parity.md](ui-parity.md) |
 | Text | 15 | 80% | ~62% | 18–30 | Font weights beyond Regular/Bold/Italic (#69), Tab in text boxes (#78), IME, true vertical CJK, dictionaries, AutoCorrect, thesaurus, equations (PR #55 open) | [localization-parity.md](localization-parity.md) |
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Shapes shortfall "text warp" narrowed to adjust handles: the Transform gallery applies a preset |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..6acbedf4 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt Transform gallery; previous: File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -83,6 +83,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
 | Exact size/position, lock aspect | yes | yes |
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
+| WordArt transform | Transform gallery | Shape Format ▸ Text Effects ▸ Transform (`format.textWarp`): No Transform, Follow Path and the other 36 presets. No adjust handles |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
 | Drag and drop of files and between thumbnails | yes | yes |
 | Image paste from the clipboard | yes | macOS yes; Windows and Linux no (#53) |
@@ -148,6 +149,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | WordArt Transform gallery on Shape Format ▸ Text Effects; `format.textWarp` applies a preset or clears it. Adjust handles remain open |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 460a2712e466ac0e922d712cfd7a3ea16826f15b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:07:06 +0300
Subject: [PATCH 147/376] Transitions: choose a transition sound and play it in
 the show
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Transition sounds were read from and written to .pptx but could not be
set and never played. Transitions › Timing gets a Sound box ([No Sound]
or Other Sound…), backed by a new transition.sound command that embeds
an audio file on the selected slides (or removes it with none). In the
slide show the sound plays as its slide comes in and, as in PowerPoint,
keeps playing into the next slide unless that slide has a sound of its
own. Built-in sounds, Stop Previous Sound and Loop Until Next Sound are
still missing; the parity docs say so.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/transition.rs | 45 +++++++++++++++++++++++++++++
 crates/pptx/tests/roundtrip.rs      | 45 +++++++++++++++++++++++++++++
 crates/ui-egui/src/lib.rs           |  7 +++++
 crates/ui-egui/src/ribbon.rs        | 22 ++++++++++++++
 crates/ui-egui/src/show.rs          | 17 ++++++++++-
 docs/animation-parity.md            |  4 +--
 docs/parity-checklist.md            |  2 +-
 7 files changed, 138 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/cmd/transition.rs b/crates/engine/src/cmd/transition.rs
index 616cf002..28db7607 100644
--- a/crates/engine/src/cmd/transition.rs
+++ b/crates/engine/src/cmd/transition.rs
@@ -30,6 +30,15 @@ pub fn specs() -> Vec<CommandSpec> {
             has_slide,
             timing
         ),
+        cmd!(
+            "transition.sound",
+            "Sound",
+            ["Transitions", "Timing"],
+            None,
+            "{path? | data: base64, name?; none?: true (No Sound); index?} — the sound plays as the slide comes in",
+            has_slide,
+            sound
+        ),
         cmd!("transition.applyAll", "Apply To All", ["Transitions", "Timing"], None, "{}", has_slide, apply_all),
         cmd!(query "transition.list", "Transition Gallery", [], None, "{} → [{id, label, category, duration, options}]", always, list),
     ]
@@ -108,6 +117,42 @@ fn timing(s: &mut Session, p: &Value) -> Result<Value> {
     ok()
 }
 
+/// Transitions › Sound: embed an audio file as the slides' transition sound, or `none` to remove it.
+fn sound(s: &mut Session, p: &Value) -> Result<Value> {
+    let list = slide_indices(s, p)?;
+    if bool_param(p, "none") == Some(true) {
+        s.edit(|doc, _| {
+            for i in list {
+                if let Some(sl) = doc.slides.get_mut(i)
+                    && let Some(t) = Arc::make_mut(sl).transition.as_mut()
+                {
+                    t.sound = None;
+                }
+            }
+            Ok(())
+        })?;
+        return Ok(json!({"sound": null}));
+    }
+    let (name, bytes) = super::insert::media_bytes(p, "transition.sound")?;
+    let ct = super::insert::content_type(&name, &bytes);
+    let bytes = Arc::new(bytes);
+    let audible = deckcraft_media::probe(&bytes).is_ok_and(|i| i.audio.is_some());
+    let bytes = Arc::try_unwrap(bytes).unwrap_or_else(|a| (*a).clone());
+    if !audible && !ct.starts_with("audio/") {
+        return Err(bad("transition.sound", format!("{name} is not a sound file ({ct})")));
+    }
+    let media = s.edit(|doc, _| {
+        let media = doc.add_media(&name, ct, bytes);
+        for i in list {
+            if let Some(sl) = doc.slides.get_mut(i) {
+                Arc::make_mut(sl).transition.get_or_insert_with(Transition::default).sound = Some(media);
+            }
+        }
+        Ok(media)
+    })?;
+    Ok(json!({"sound": name, "media": media.0, "playable": audible}))
+}
+
 fn apply_all(s: &mut Session, _p: &Value) -> Result<Value> {
     s.edit(|doc, sel| {
         let t = doc.slides.get(sel.slide).and_then(|x| x.transition.clone());
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..f9c8bc91 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,48 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+/// A tiny 8 kHz mono 16-bit WAV of `n` silent samples.
+fn wav(n: u32) -> Vec<u8> {
+    let mut v = Vec::new();
+    v.extend_from_slice(b"RIFF");
+    v.extend_from_slice(&(36 + n * 2).to_le_bytes());
+    v.extend_from_slice(b"WAVEfmt ");
+    v.extend_from_slice(&16u32.to_le_bytes());
+    v.extend_from_slice(&1u16.to_le_bytes());
+    v.extend_from_slice(&1u16.to_le_bytes());
+    v.extend_from_slice(&8000u32.to_le_bytes());
+    v.extend_from_slice(&16000u32.to_le_bytes());
+    v.extend_from_slice(&2u16.to_le_bytes());
+    v.extend_from_slice(&16u16.to_le_bytes());
+    v.extend_from_slice(b"data");
+    v.extend_from_slice(&(n * 2).to_le_bytes());
+    v.resize(v.len() + n as usize * 2, 0);
+    v
+}
+
+/// Transitions › Sound: a chosen sound is embedded, saved as `p:sndAc`, read back, and No Sound
+/// removes it; a file that isn't audio is refused.
+#[test]
+fn transition_sound_is_set_saved_and_removed() {
+    use deckcraft_engine::Session;
+    use serde_json::json;
+    let b64 = deckcraft_engine::cmd::base64_encode(&wav(800));
+    let mut s = Session::with_new();
+    s.execute("transition.set", &json!({"kind": "fade"})).unwrap();
+    let r = s.execute("transition.sound", &json!({"data": b64, "name": "chime.wav"})).unwrap();
+    assert_eq!(r["playable"], true, "{r}");
+    let doc = s.doc().unwrap().doc.clone();
+    let m = doc.slides[0].transition.as_ref().and_then(|t| t.sound).expect("sound set");
+    assert_eq!(doc.media(m).map(|i| i.name.as_str()), Some("chime.wav"));
+    let bytes = deckcraft_pptx::export(&doc).unwrap();
+    let back = deckcraft_pptx::import(&bytes).unwrap();
+    let t = back.slides[0].transition.as_ref().expect("transition");
+    assert_eq!(t.kind, "fade");
+    let m = t.sound.expect("sound survives the save");
+    assert_eq!(back.media(m).map(|i| i.data.len()), Some(wav(800).len()));
+    s.execute("transition.sound", &json!({"none": true})).unwrap();
+    assert!(s.doc().unwrap().doc.slides[0].transition.as_ref().is_some_and(|t| t.sound.is_none()));
+    let not_audio = deckcraft_engine::cmd::base64_encode(b"hello, not a sound");
+    assert!(s.execute("transition.sound", &json!({"data": not_audio, "name": "notes.txt"})).is_err());
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..0dffbed6 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -580,6 +580,13 @@ impl SlideApp {
         Ok(())
     }
 
+    /// Transitions › Sound › Other Sound…: pick an audio file for the selected slides.
+    pub(crate) fn pick_transition_sound(&mut self) {
+        if self.services.pick_open.is_some() {
+            self.pick_and_insert("audio", "transition.sound");
+        }
+    }
+
     fn pick_and_insert(&mut self, purpose: &str, cmd: &str) {
         if let Some(pick) = self.services.pick_open.as_mut() {
             if let Some(path) = pick(purpose) {
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..90535b56 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1389,6 +1389,28 @@ fn transitions(app: &mut SlideApp, ui: &mut Ui) {
         });
     });
     group(ui, |ui| {
+        // Sound in its own column, so the timing column keeps its three rows.
+        rows(ui, |ui| {
+            ui.horizontal(|ui| {
+                ui.label("Sound:");
+                let name = cur
+                    .as_ref()
+                    .and_then(|t| t.sound)
+                    .and_then(|m| app.session.active().and_then(|d| d.doc.media(m).map(|i| i.name.clone())))
+                    .unwrap_or_else(|| "[No Sound]".into());
+                egui::ComboBox::from_id_salt("transition_sound").width(120.0).selected_text(name).show_ui(ui, |ui| {
+                    if ui.selectable_label(cur.as_ref().is_none_or(|t| t.sound.is_none()), "[No Sound]").clicked() {
+                        run(app, "transition.sound", json!({"none": true}));
+                    }
+                    let can_pick = app.services.pick_open.is_some();
+                    let r = ui.add_enabled(can_pick, egui::Button::new("Other Sound…"));
+                    if r.clicked() {
+                        app.pick_transition_sound();
+                    }
+                    r.on_disabled_hover_text("Choosing a sound file needs the desktop app");
+                });
+            });
+        });
         rows(ui, |ui| {
             ui.horizontal(|ui| {
                 ui.label("Duration:");
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..aee3168a 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -686,6 +686,9 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     }
 }
 
+/// The media-host voice for slide transition sounds (no shape has this id).
+pub(crate) const TRANSITION_SOUND: ShapeId = ShapeId(u32::MAX);
+
 /// Start the media of a newly shown slide: media from the previous slide stops unless it plays
 /// across slides; media set to start automatically plays. Everything stops at the end.
 fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
@@ -694,8 +697,16 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
         return;
     }
     show.media_slide = cur;
+    let sound = cur.and_then(|i| doc.slides.get(i)).and_then(|s| s.transition.as_ref()).and_then(|t| t.sound);
     let keep: Vec<ShapeId> = match cur {
-        Some(_) => app.media.ids().into_iter().filter(|id| crate::media::find_clip(doc, *id).is_some_and(|c| c.play_across_slides)).collect(),
+        Some(_) => app
+            .media
+            .ids()
+            .into_iter()
+            .filter(|id| crate::media::find_clip(doc, *id).is_some_and(|c| c.play_across_slides))
+            // A transition sound plays to its end, as in PowerPoint, unless the new slide has its own.
+            .chain(sound.is_none().then_some(TRANSITION_SOUND).filter(|id| app.media.is_playing(*id)))
+            .collect(),
         None => vec![],
     };
     for id in app.media.ids() {
@@ -703,6 +714,10 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
             app.media.stop(id);
         }
     }
+    if let Some(media) = sound {
+        let clip = deckcraft_model::MediaClip { media, volume: 1.0, ..Default::default() };
+        app.media.play(doc, TRANSITION_SOUND, &clip, None, crate::media::Owner::Show);
+    }
     if let Some(i) = cur {
         for (id, _, clip) in crate::media::slide_media(doc, i) {
             if clip.autoplay && !keep.contains(&id) {
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 8ec5d0f4..436a0dee 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -39,7 +39,7 @@ perspective-correct subdivided meshes.
 |---|---|---|
 | Effect Options per transition | yes | yes |
 | Duration, advance on click / after time, Apply To All | yes | yes |
-| Transition sounds | yes | **no** (the model has the field; no picker, no playback) |
+| Transition sounds | yes | partly: Transitions › Sound › Other Sound… embeds a file, it plays as the slide comes in and round-trips; no built-in sounds, Stop Previous Sound or Loop Until Next Sound |
 | Preview in the editor | yes | yes |
 | Morph: objects move, resize, recolour | yes | yes |
 | Morph: Words and Characters | yes | yes (#5) |
@@ -84,7 +84,7 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 | Animation Pane timeline, preview from selected, effect dialog depth | 5–8 |
 | The remaining ~126 effects (most are parameter variations of existing ones) | 3–6 |
 | Rewind and other effect options on round trip (#77) | 1–2 |
-| Transition sounds | 1–2 |
+| Transition sounds: built-in sounds, Stop Previous Sound, Loop Until Next Sound | 1–2 |
 | Morph across pictures, `!!` names, align once per transition (#67) | 2–4 |
 | Cloth, paper and particle transitions as real meshes (Curtains, Peel Off, Page Curl, Airplane, Origami, Vortex, Shred, Honeycomb) | 4–8 |
 | **Total** | **~16–30** (the Transitions and Animations rows of the feature table; part of the Features dimension's 140–240 h) |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..5906ee5a 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -199,7 +199,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Transitions | Transition gallery (fade, push, wipe, split, cover, uncover, zoom, morph…) | P0 | D |
 | Transitions | Effect options and duration | P0 | D |
 | Transitions | Advance on click / after time, apply to all | P0 | D |
-| Transitions | Transition sounds | P2 | M |
+| Transitions | Transition sounds | P2 | P |
 | Transitions | Morph | P1 | D |
 | Animations | Entrance, emphasis, exit effects | P0 | D |
 | Animations | Motion paths | P1 | P |

From ad24f545e2c1d5c491c55e0a164e076726a23845 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:09:33 +0300
Subject: [PATCH 148/376] Format Shape: picture or texture fill options

shape.fill gains pictureProps for a picture fill: tile on/off, tile
offset X/Y (pt), scale X/Y, alignment and mirror type, stretch offsets
(left/top/right/bottom), and rotate with shape. `transparency` now also
sets a picture fill's opacity. Values are clamped and unknown keywords or
non-finite numbers ignored. The Fill page of the Format Shape pane gets a
"Picture or texture fill" option with a picture source button and these
controls. The model, renderer and PPTX reader/writer already carry the
fields; a new engine test checks they survive a PPTX save and reopen.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/shape.rs |  65 +++++++++++++++++++--
 crates/engine/src/tests.rs     |  40 +++++++++++++
 crates/ui-egui/src/panes.rs    | 104 ++++++++++++++++++++++++++++++++-
 docs/ui-parity.md              |   2 +-
 4 files changed, 203 insertions(+), 8 deletions(-)

diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..ea5a0940 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -2,7 +2,7 @@
 //! names and alt text.
 
 use deckcraft_color::{ColorTransform, Rgba, SchemeSlot};
-use deckcraft_model::style::{Dash, Glow, Gradient, GradientShape, GradientStop, LineEnd, PatternFill, PictureFill, Reflection, Shadow};
+use deckcraft_model::style::{Dash, Glow, Gradient, GradientShape, GradientStop, LineEnd, PatternFill, PictureFill, PictureMode, Reflection, Shadow};
 use deckcraft_model::{ColorRef, Effects, Fill, Geom, Line, ShapeStyle};
 use serde_json::{Value, json};
 
@@ -42,7 +42,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Shape Fill",
             ["Shape Format", "Shape Styles"],
             None,
-            "{color? | none?: true | gradient?: {stops: [[pos, color]], angle?, kind?: linear|radial} | picture?: base64 | pattern?: {preset, fg, bg} | transparency?: 0..1 | reset?: true, ids?}",
+            "{color? | none?: true | gradient?: {stops: [[pos, color]], angle?, kind?: linear|radial} | picture?: base64 | pattern?: {preset, fg, bg} | transparency?: 0..1 | reset?: true, ids?}; pictureProps?: {tile?: bool, offsetX?, offsetY?: pt, scaleX?, scaleY?: 0..10, align?: tl|t|tr|l|ctr|r|bl|b|br, mirror?: none|x|y|xy, stretch?: [l, t, r, b] fractions, rotateWithShape?: bool} adjusts a picture fill",
             has_selection,
             fill
         ),
@@ -290,8 +290,9 @@ fn fill(s: &mut Session, p: &Value) -> Result<Value> {
         None
     };
     let transparency = f64_param(p, "transparency");
-    if new_fill.is_none() && transparency.is_none() {
-        return Err(bad("shape.fill", "give `color`, `none`, `gradient`, `pattern`, `picture`, `transparency` or `reset`"));
+    let pic_props = p.get("pictureProps").filter(|v| v.is_object());
+    if new_fill.is_none() && transparency.is_none() && pic_props.is_none() {
+        return Err(bad("shape.fill", "give `color`, `none`, `gradient`, `pattern`, `picture`, `pictureProps`, `transparency` or `reset`"));
     }
     // Transparency on an inherited (style) fill needs the effective colour.
     let st = s.doc()?;
@@ -319,6 +320,14 @@ fn fill(s: &mut Session, p: &Value) -> Result<Value> {
         if let Some(f) = &new_fill {
             sh.fill.clone_from(f);
         }
+        if let (Some(pp), Some(Fill::Picture(pf))) = (pic_props, sh.fill.as_mut()) {
+            picture_props(pf, pp);
+        }
+        if let (Some(t), Some(Fill::Picture(pf))) = (transparency, sh.fill.as_mut()) {
+            let a = 1.0 - t.clamp(0.0, 1.0);
+            pf.alpha = (a < 1.0).then_some(a);
+            return Ok(());
+        }
         if let Some(t) = transparency {
             let base = sh.fill.clone().or_else(|| ctx_fill.iter().find(|(i, _)| *i == sh.id).and_then(|(_, f)| f.clone()));
             if let Some(Fill::Solid { mut color }) = base {
@@ -333,6 +342,54 @@ fn fill(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
+/// Applies Format Shape ▸ Picture or texture fill options to a picture fill.
+fn picture_props(pf: &mut PictureFill, pp: &Value) {
+    let f = |k: &str| pp.get(k).and_then(Value::as_f64).filter(|v| v.is_finite());
+    if let Some(up) = pp.get("rotateWithShape").and_then(Value::as_bool) {
+        pf.upright = !up;
+    }
+    match pp.get("tile").and_then(Value::as_bool) {
+        Some(true) if !matches!(pf.mode, PictureMode::Tile { .. }) => {
+            pf.mode = PictureMode::Tile { tx: 0.0, ty: 0.0, sx: 1.0, sy: 1.0, flip: "none".into(), align: "tl".into() };
+        }
+        Some(false) if !matches!(pf.mode, PictureMode::Stretch { .. }) => pf.mode = PictureMode::default(),
+        _ => {}
+    }
+    match &mut pf.mode {
+        PictureMode::Tile { tx, ty, sx, sy, flip, align } => {
+            if let Some(v) = f("offsetX") {
+                *tx = v.clamp(-4000.0, 4000.0);
+            }
+            if let Some(v) = f("offsetY") {
+                *ty = v.clamp(-4000.0, 4000.0);
+            }
+            if let Some(v) = f("scaleX") {
+                *sx = v.clamp(0.01, 10.0);
+            }
+            if let Some(v) = f("scaleY") {
+                *sy = v.clamp(0.01, 10.0);
+            }
+            if let Some(m) = pp.get("mirror").and_then(Value::as_str).filter(|m| matches!(*m, "none" | "x" | "y" | "xy")) {
+                *flip = m.to_string();
+            }
+            if let Some(a) =
+                pp.get("align").and_then(Value::as_str).filter(|a| matches!(*a, "tl" | "t" | "tr" | "l" | "ctr" | "r" | "bl" | "b" | "br"))
+            {
+                *align = a.to_string();
+            }
+        }
+        PictureMode::Stretch { fill_rect } => {
+            if let Some(arr) = pp.get("stretch").and_then(Value::as_array) {
+                for (slot, v) in fill_rect.iter_mut().zip(arr) {
+                    if let Some(v) = v.as_f64().filter(|v| v.is_finite()) {
+                        *slot = v.clamp(-10.0, 0.99);
+                    }
+                }
+            }
+        }
+    }
+}
+
 fn line_end(v: &str) -> Option<LineEnd> {
     if v == "none" { None } else { Some(LineEnd { kind: v.to_string(), w: "med".into(), len: "med".into() }) }
 }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..1b8e3453 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,43 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn shape_picture_fill_options_tile_offset_and_round_trip() {
+    use deckcraft_model::style::PictureMode;
+    let mut img = image::RgbaImage::new(4, 4);
+    img.put_pixel(0, 0, image::Rgba([255, 0, 0, 255]));
+    let mut png = Vec::new();
+    image::DynamicImage::ImageRgba8(img).write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png).unwrap();
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100]})).unwrap();
+    let pf = |s: &Session| match s.doc().unwrap().selected_shapes()[0].fill.clone() {
+        Some(deckcraft_model::Fill::Picture(pf)) => pf,
+        other => panic!("{other:?}"),
+    };
+    // Options without a picture fill are a no-op, not an error.
+    s.execute("shape.fill", &json!({"pictureProps": {"tile": true}})).unwrap();
+    s.execute("shape.fill", &json!({"picture": cmd::base64_encode(&png)})).unwrap();
+    s.execute("shape.fill", &json!({"pictureProps": {"stretch": [0.1, 0.2, 5, "x"]}})).unwrap();
+    assert_eq!(pf(&s).mode, PictureMode::Stretch { fill_rect: [0.1, 0.2, 0.99, 0.0] });
+    s.execute("shape.fill", &json!({"pictureProps": {"tile": true, "offsetX": 12, "offsetY": -3, "scaleX": 0.5, "scaleY": 50, "align": "ctr", "mirror": "xy", "rotateWithShape": false}})).unwrap();
+    s.execute("shape.fill", &json!({"pictureProps": {"align": "bogus", "offsetX": f64::NAN}, "transparency": 0.4})).unwrap();
+    let want = PictureMode::Tile { tx: 12.0, ty: -3.0, sx: 0.5, sy: 10.0, flip: "xy".into(), align: "ctr".into() };
+    let got = pf(&s);
+    assert_eq!(got.mode, want);
+    assert!(got.upright);
+    assert!((got.alpha.unwrap() - 0.6).abs() < 1e-9);
+    // PPTX round trip keeps the options.
+    let bytes = cmd::file::save_bytes(&s.doc().unwrap().doc, "pptx").unwrap();
+    s.execute("file.openBytes", &json!({"name": "p.pptx", "data": cmd::base64_encode(&bytes)})).unwrap();
+    let doc = &s.doc().unwrap().doc;
+    let back = doc.slides.iter().flat_map(|sl| sl.shapes.iter()).find_map(|sh| match &sh.fill {
+        Some(deckcraft_model::Fill::Picture(pf)) => Some(pf.clone()),
+        _ => None,
+    });
+    let back = back.unwrap();
+    assert_eq!(back.mode, want);
+    assert!(back.upright);
+    assert!((back.alpha.unwrap() - 0.6).abs() < 1e-6);
+}
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..c56528a6 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -262,9 +262,14 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
                 Some(Fill::Pattern(_)) => "pattern",
                 _ => "auto",
             };
-            for (l, k) in
-                [("No fill", "none"), ("Solid fill", "solid"), ("Gradient fill", "gradient"), ("Pattern fill", "pattern"), ("Automatic", "auto")]
-            {
+            for (l, k) in [
+                ("No fill", "none"),
+                ("Solid fill", "solid"),
+                ("Gradient fill", "gradient"),
+                ("Picture or texture fill", "picture"),
+                ("Pattern fill", "pattern"),
+                ("Automatic", "auto"),
+            ] {
                 if ui.radio(kind == k, l).clicked() {
                     match k {
                         "none" => run(app, "shape.fill", json!({"none": true})),
@@ -275,6 +280,7 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
                             json!({"gradient": {"stops": [[0, "accent1"], [1, {"scheme": "accent1", "lumMod": 50000}]], "angle": 90}}),
                         ),
                         "pattern" => run(app, "shape.fill", json!({"pattern": {"preset": "pct25", "fg": "accent1", "bg": "bg1"}})),
+                        "picture" => pick_fill_picture(app),
                         _ => run(app, "shape.fill", json!({"reset": true})),
                     }
                 }
@@ -293,6 +299,9 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
                     let _ = app.run("shape.fill", json!({"transparency": v as f64 / 100.0}));
                 }
             });
+            if let Some(Fill::Picture(pf)) = &sh.fill {
+                picture_fill_options(app, ui, sh.id.0, pf);
+            }
             if let Some(Fill::Gradient(g)) = &sh.fill {
                 let sc = scheme(app);
                 if let Some(ng) = crate::fillui::gradient_editor(ui, "shape-grad", g, &sc) {
@@ -339,6 +348,95 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
     }
 }
 
+/// Asks for a picture file and makes it the selected shapes' fill.
+fn pick_fill_picture(app: &mut SlideApp) {
+    if let Some(pick) = app.services.pick_open.as_mut()
+        && let Some(path) = pick("picture")
+        && let Some(Ok(bytes)) = app.services.read.as_ref().map(|r| r(&path))
+    {
+        run(app, "shape.fill", json!({"picture": deckcraft_engine::cmd::base64_encode(&bytes)}));
+    }
+}
+
+/// A number field for one picture-fill option; runs `shape.fill` with `{pictureProps: {key: v × scale}}`
+/// when it changes.
+fn pic_drag(app: &mut SlideApp, ui: &mut Ui, label: &str, value: f64, suffix: &str, key: &str, scale: f64) {
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(90.0, 20.0), egui::Label::new(label));
+        let mut v = value;
+        let r = ui.add(egui::DragValue::new(&mut v).suffix(suffix).max_decimals(1));
+        if r.drag_stopped() || r.lost_focus() || (r.changed() && !r.dragged()) {
+            run(app, "shape.fill", json!({"pictureProps": {key: v * scale}}));
+        }
+    });
+}
+
+/// Format Shape ▸ Fill ▸ Picture or texture fill: source, tiling, offsets, transparency.
+fn picture_fill_options(app: &mut SlideApp, ui: &mut Ui, id: u32, pf: &deckcraft_model::style::PictureFill) {
+    use deckcraft_model::style::PictureMode;
+    ui.horizontal(|ui| {
+        ui.label("Picture source");
+        if ui.button("Insert…").clicked() {
+            pick_fill_picture(app);
+        }
+    });
+    let mut tile = matches!(pf.mode, PictureMode::Tile { .. });
+    if ui.checkbox(&mut tile, "Tile picture as texture").changed() {
+        run(app, "shape.fill", json!({"pictureProps": {"tile": tile}}));
+    }
+    match &pf.mode {
+        PictureMode::Tile { tx, ty, sx, sy, flip, align } => {
+            pic_drag(app, ui, "Offset X", *tx, " pt", "offsetX", 1.0);
+            pic_drag(app, ui, "Offset Y", *ty, " pt", "offsetY", 1.0);
+            pic_drag(app, ui, "Scale X", sx * 100.0, "%", "scaleX", 0.01);
+            pic_drag(app, ui, "Scale Y", sy * 100.0, "%", "scaleY", 0.01);
+            let aligns = [
+                ("tl", "Top left"),
+                ("t", "Top"),
+                ("tr", "Top right"),
+                ("l", "Left"),
+                ("ctr", "Center"),
+                ("r", "Right"),
+                ("bl", "Bottom left"),
+                ("b", "Bottom"),
+                ("br", "Bottom right"),
+            ];
+            let mirrors = [("none", "None"), ("x", "Horizontal"), ("y", "Vertical"), ("xy", "Both")];
+            for (label, key, opts, cur) in [("Alignment", "align", &aligns[..], align), ("Mirror type", "mirror", &mirrors[..], flip)] {
+                ui.horizontal(|ui| {
+                    ui.add_sized(vec2(90.0, 20.0), egui::Label::new(label));
+                    let shown = opts.iter().find(|(k, _)| k == cur).map_or(opts[0].1, |(_, l)| *l);
+                    egui::ComboBox::from_id_salt(("picfill", id, key)).selected_text(shown).show_ui(ui, |ui| {
+                        for (k, l) in opts {
+                            if ui.selectable_label(*k == cur.as_str(), *l).clicked() {
+                                run(app, "shape.fill", json!({"pictureProps": {key: k}}));
+                            }
+                        }
+                    });
+                });
+            }
+        }
+        PictureMode::Stretch { fill_rect } => {
+            for (i, label) in ["Offset left", "Offset top", "Offset right", "Offset bottom"].into_iter().enumerate() {
+                ui.horizontal(|ui| {
+                    ui.add_sized(vec2(90.0, 20.0), egui::Label::new(label));
+                    let mut v = fill_rect[i] * 100.0;
+                    let r = ui.add(egui::DragValue::new(&mut v).suffix("%").max_decimals(0));
+                    if r.drag_stopped() || r.lost_focus() || (r.changed() && !r.dragged()) {
+                        let mut rect = *fill_rect;
+                        rect[i] = v / 100.0;
+                        run(app, "shape.fill", json!({"pictureProps": {"stretch": rect}}));
+                    }
+                });
+            }
+        }
+    }
+    let mut rot = !pf.upright;
+    if ui.checkbox(&mut rot, "Rotate with shape").changed() {
+        run(app, "shape.fill", json!({"pictureProps": {"rotateWithShape": rot}}));
+    }
+}
+
 fn background(app: &mut SlideApp, ui: &mut Ui) {
     let sc = scheme(app);
     let bg = app.session.active().and_then(|d| d.current_slide().and_then(|s| s.background.clone()));
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..24504b0e 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -58,7 +58,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 
 | Pane / dialog | PowerPoint | DeckCraft |
 |---|---|---|
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
+| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, picture/texture fill (source, tile, offsets, scale, alignment, mirror, transparency, rotate with shape), line, some effects, size; no 3-D |
 | Format Background pane | yes | yes |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |

From e9315bc141d75511ef8a84531ec8f880e9ef8d97 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:09:48 +0300
Subject: [PATCH 149/376] UI: seeded whole-window soak with memory and timing
 bounds

ui_soak_tests.rs drives the app through the egui test harness with seeded
random clicks, drags, keys (plain, Ctrl, Shift), typing and scrolling over the
sample deck. Every ten actions it checks that every document validates, the
selection is in range, undo, journal, thumbnail and texture caches stay
bounded, and no command or render panic was caught; at the end, that input
really reached the editor and the mean frame stays under 250 ms. Two seeds x
150 actions run in CI; DECKCRAFT_UI_SOAK_STEPS/SEED run it long.

Panics swallowed by the guards were invisible to tests: Session now counts
them (panics_caught) and deckcraft_render::panics_caught() counts render
panics drawn as blank. Textures::thumb_count exposes the thumbnail cache size.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/guard.rs          |   2 +
 crates/engine/src/lib.rs            |   3 +
 crates/render/src/lib.rs            |  15 ++
 crates/ui-egui/src/lib.rs           |   2 +
 crates/ui-egui/src/textures.rs      |   5 +
 crates/ui-egui/src/ui_soak_tests.rs | 206 ++++++++++++++++++++++++++++
 docs/gaps.md                        |  13 +-
 7 files changed, 241 insertions(+), 5 deletions(-)
 create mode 100644 crates/ui-egui/src/ui_soak_tests.rs

diff --git a/crates/engine/src/guard.rs b/crates/engine/src/guard.rs
index 2a633ca6..8d2b7143 100644
--- a/crates/engine/src/guard.rs
+++ b/crates/engine/src/guard.rs
@@ -52,6 +52,7 @@ impl Session {
                     st.revision = revision.max(st.revision).saturating_add(1);
                 }
                 log::error!("command `{id}` panicked: {msg}");
+                self.panics_caught = self.panics_caught.saturating_add(1);
                 if let Some(dir) = self.recovery_dir.clone()
                     && let Err(e) = crate::recovery::save(self, &dir)
                 {
@@ -85,6 +86,7 @@ mod tests {
         assert!(err.to_string().contains("test.panic") && err.to_string().contains("boom"), "{err}");
         let st = s.active().unwrap();
         assert!(std::sync::Arc::ptr_eq(&st.doc, &before), "the document is the one from before the command");
+        assert_eq!(s.panics_caught, 1, "the guard counts what it caught");
         // The session keeps working.
         s.execute("shape.insert", &json!({"preset": "ellipse", "rect": [36, 236, 200, 400]})).unwrap();
     }
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..08aca66b 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -351,6 +351,8 @@ pub struct Session {
     /// ends) instead of Windows and Linux (Ctrl+arrows by word or paragraph). Defaults to the
     /// platform DeckCraft was built for.
     pub mac_keys: bool,
+    /// Command panics caught by the guard (the document was rolled back); soak tests require 0.
+    pub panics_caught: u64,
 }
 
 impl Default for Session {
@@ -379,6 +381,7 @@ impl Session {
             media_status: Default::default(),
             gif_paused: Default::default(),
             mac_keys: cfg!(target_os = "macos"),
+            panics_caught: 0,
         }
     }
     /// A session with one new presentation open.
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..8f04ae3b 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -257,6 +257,17 @@ impl Default for Renderer {
     }
 }
 
+static PANICS: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);
+
+fn note_panic() {
+    PANICS.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+}
+
+/// Render panics caught (and drawn as blank) since start; soak tests require it to stay 0.
+pub fn panics_caught() -> u64 {
+    PANICS.load(std::sync::atomic::Ordering::Relaxed)
+}
+
 thread_local! {
     static RENDERER: std::cell::RefCell<Renderer> = std::cell::RefCell::new(Renderer::default());
 }
@@ -330,6 +341,7 @@ pub fn render_slide_drawn(pres: &Presentation, index: usize, opts: &RenderOpts)
         }
         Err(_) => {
             log::error!("rendering slide {index} panicked; showing a blank slide");
+            note_panic();
             RENDERER.with(|r| *r.borrow_mut() = Renderer::default());
             let (w, h) = output_size(pres, opts);
             (Image { width: w as u32, height: h as u32, pixels: vec![255; w as usize * h as usize * 4] }, page)
@@ -354,6 +366,7 @@ pub fn render_slide_part(pres: &Presentation, index: usize, part: SlidePart, opt
         Ok(img) => img,
         Err(_) => {
             log::error!("rendering part of slide {index} panicked; showing nothing");
+            note_panic();
             RENDERER.with(|r| *r.borrow_mut() = Renderer::default());
             let (w, h) = output_size(pres, opts);
             Image { width: w as u32, height: h as u32, pixels: vec![0; w as usize * h as usize * 4] }
@@ -385,6 +398,7 @@ pub fn render_blend(
         Ok(img) => img,
         Err(_) => {
             log::error!("rendering a frame between slides {old} and {new} panicked; showing the new slide");
+            note_panic();
             RENDERER.with(|r| *r.borrow_mut() = Renderer::default());
             render_slide(pres, new, opts)
         }
@@ -397,6 +411,7 @@ pub fn render_layout(pres: &Presentation, master: usize, layout: Option<usize>,
         Ok(img) => img,
         Err(_) => {
             log::error!("rendering a layout panicked; showing a blank image");
+            note_panic();
             RENDERER.with(|r| *r.borrow_mut() = Renderer::default());
             Image::default()
         }
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..bf83512e 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1129,6 +1129,8 @@ fn js_now() -> f64 {
 
 #[cfg(test)]
 mod ime_tests;
+#[cfg(test)]
+mod ui_soak_tests;
 
 #[cfg(test)]
 mod tests {
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index 40498422..02c56925 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -162,6 +162,11 @@ impl Textures {
         Some((tex, region))
     }
 
+    /// Cached thumbnails (bounded; soak tests check it).
+    pub fn thumb_count(&self) -> usize {
+        self.thumbs.len()
+    }
+
     /// Force the canvas to re-render next time (fonts loaded, theme changed in place…).
     pub fn invalidate(&mut self) {
         self.canvas = None;
diff --git a/crates/ui-egui/src/ui_soak_tests.rs b/crates/ui-egui/src/ui_soak_tests.rs
new file mode 100644
index 00000000..6e25c696
--- /dev/null
+++ b/crates/ui-egui/src/ui_soak_tests.rs
@@ -0,0 +1,206 @@
+//! UI soak: the whole window driven by seeded random input (clicks, drags, keys with and without
+//! Ctrl/Shift, typing, scrolling) over the sample deck, with invariants every few actions: no
+//! panic, every document valid, undo/journal/texture caches bounded, and frame time bounded.
+//!
+//! `DECKCRAFT_UI_SOAK_STEPS=5000 cargo test -p deckcraft-ui-egui ui_soak_long -- --ignored`
+//! runs a long one; `DECKCRAFT_UI_SOAK_SEED` picks the seed.
+
+use std::collections::VecDeque;
+use std::time::{Duration, Instant};
+
+use deckcraft_engine::Session;
+use egui::{Event, Key, Modifiers, MouseWheelUnit, Pos2, vec2};
+use egui_kittest::Harness;
+
+use crate::{Services, SlideApp};
+
+const W: f32 = 1400.0;
+const H: f32 = 900.0;
+/// Bounds that a long session must stay under.
+const MAX_TEXTURES: usize = 1_500;
+const MAX_THUMBS: usize = 600;
+const MAX_JOURNAL: usize = 10_000;
+/// Mean wall time per frame, generous for slow CI machines (the test profile is optimized).
+const MAX_MEAN_FRAME: Duration = Duration::from_millis(250);
+
+struct Rng(u64);
+
+impl Rng {
+    fn next(&mut self) -> u64 {
+        self.0 ^= self.0 >> 12;
+        self.0 ^= self.0 << 25;
+        self.0 ^= self.0 >> 27;
+        self.0.wrapping_mul(0x2545_F491_4F6C_DD1D)
+    }
+    fn below(&mut self, n: usize) -> usize {
+        if n == 0 { 0 } else { (self.next() % n as u64) as usize }
+    }
+    fn pos(&mut self) -> Pos2 {
+        Pos2::new(self.below(W as usize) as f32, self.below(H as usize) as f32)
+    }
+}
+
+const KEYS: &[Key] = &[
+    Key::ArrowLeft,
+    Key::ArrowRight,
+    Key::ArrowUp,
+    Key::ArrowDown,
+    Key::Enter,
+    Key::Tab,
+    Key::Backspace,
+    Key::Delete,
+    Key::Escape,
+    Key::Home,
+    Key::End,
+    Key::PageUp,
+    Key::PageDown,
+    Key::A,
+    Key::C,
+    Key::V,
+    Key::X,
+    Key::D,
+    Key::G,
+    Key::B,
+    Key::I,
+    Key::Z,
+    Key::Y,
+    Key::M,
+    Key::F5,
+];
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut s = Session::new();
+    deckcraft_engine::sample::open_sample(&mut s).unwrap();
+    let app = SlideApp::new(s, Services::default());
+    let mut h = Harness::builder().with_size(vec2(W, H)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn act(h: &mut Harness<'_, SlideApp>, r: &mut Rng) -> String {
+    match r.below(9) {
+        0..=2 => {
+            let p = r.pos();
+            h.hover_at(p);
+            h.run_steps(1);
+            h.drag_at(p);
+            h.run_steps(1);
+            h.drop_at(p);
+            format!("click {p:?}")
+        }
+        3 => {
+            let (a, b) = (r.pos(), r.pos());
+            h.hover_at(a);
+            h.run_steps(1);
+            h.drag_at(a);
+            for i in 1..=4 {
+                h.hover_at(a + (b - a) * (i as f32 / 4.0));
+                h.run_steps(1);
+            }
+            h.drop_at(b);
+            format!("drag {a:?} -> {b:?}")
+        }
+        4 | 5 => {
+            let k = KEYS[r.below(KEYS.len())];
+            let m = match r.below(4) {
+                0 => Modifiers::COMMAND,
+                1 => Modifiers::SHIFT,
+                _ => Modifiers::NONE,
+            };
+            h.key_press_modifiers(m, k);
+            format!("key {m:?} {k:?}")
+        }
+        6 => {
+            h.event(Event::Text("Soak ✓ שלום 漢字 ".into()));
+            "type".into()
+        }
+        7 => {
+            let p = r.pos();
+            h.hover_at(p);
+            h.event(Event::MouseWheel {
+                unit: MouseWheelUnit::Line,
+                delta: vec2(0.0, if r.below(2) == 0 { 3.0 } else { -3.0 }),
+                modifiers: Modifiers::NONE,
+                phase: egui::TouchPhase::Move,
+            });
+            format!("scroll {p:?}")
+        }
+        _ => {
+            // Undo or redo through the keyboard, the way people hammer it.
+            let k = if r.below(2) == 0 { Key::Z } else { Key::Y };
+            h.key_press_modifiers(Modifiers::COMMAND, k);
+            format!("ctrl {k:?}")
+        }
+    }
+}
+
+fn check(h: &Harness<'_, SlideApp>, seed: u64, step: usize, log: &VecDeque<String>) {
+    let ctx = || format!("seed {seed} step {step}; last actions:\n{}", log.iter().cloned().collect::<Vec<_>>().join("\n"));
+    let app = h.state();
+    for d in app.session.documents() {
+        let v = d.doc.validate();
+        assert!(v.is_empty(), "invalid document {v:?}; {}", ctx());
+        assert!(d.history.undo.len() <= d.history.limit.max(1), "undo over limit; {}", ctx());
+        assert!(d.selection.slide < d.doc.slides.len().max(1), "selection slide out of range; {}", ctx());
+    }
+    assert!(app.session.journal.len() <= MAX_JOURNAL, "journal {}; {}", app.session.journal.len(), ctx());
+    assert!(app.textures.thumb_count() <= MAX_THUMBS, "thumbnails {}; {}", app.textures.thumb_count(), ctx());
+    assert_eq!(app.session.panics_caught, 0, "a command panicked (rolled back by the guard); {}", ctx());
+    assert_eq!(deckcraft_render::panics_caught(), 0, "a render panic was caught and drawn blank; {}", ctx());
+    let tex = h.ctx.tex_manager().read().num_allocated();
+    assert!(tex <= MAX_TEXTURES, "{tex} textures allocated; {}", ctx());
+}
+
+fn soak(seed: u64, steps: usize) {
+    let mut h = harness();
+    let mut r = Rng(seed | 1);
+    let mut log = VecDeque::new();
+    let t0 = Instant::now();
+    let mut frames = 0usize;
+    for step in 0..steps {
+        log.push_back(act(&mut h, &mut r));
+        if log.len() > 20 {
+            log.pop_front();
+        }
+        h.run_steps(2);
+        frames += 8;
+        if step % 10 == 9 {
+            check(&h, seed, step, &log);
+        }
+        // A modal or the slide show can swallow input forever; leave it now and then.
+        if step % 50 == 49 {
+            h.key_press(Key::Escape);
+            h.run_steps(2);
+        }
+    }
+    check(&h, seed, steps, &log);
+    let edits = h.state().session.journal.len();
+    // Random input must reach the editor, not bounce off one modal.
+    assert!(edits * 20 >= steps, "only {edits} commands ran in {steps} actions; seed {seed}");
+    let mean = t0.elapsed() / frames.max(1) as u32;
+    eprintln!("ui soak seed {seed}: {steps} actions, {edits} commands, ~{frames} frames, mean frame {mean:?}");
+    assert!(mean <= MAX_MEAN_FRAME, "mean frame {mean:?} over {MAX_MEAN_FRAME:?}; seed {seed}");
+}
+
+fn env(name: &str, default: u64) -> u64 {
+    std::env::var(name).ok().and_then(|v| v.parse().ok()).unwrap_or(default)
+}
+
+#[test]
+fn ui_soak_random_input_keeps_the_app_sound() {
+    for seed in [3, 0xC0FFEE] {
+        soak(seed, env("DECKCRAFT_UI_SOAK_STEPS", 150) as usize);
+    }
+}
+
+#[test]
+#[ignore = "long UI soak; set DECKCRAFT_UI_SOAK_STEPS"]
+fn ui_soak_long() {
+    soak(env("DECKCRAFT_UI_SOAK_SEED", 0x5EED), env("DECKCRAFT_UI_SOAK_STEPS", 3000) as usize);
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..d6dbd3b5 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -48,11 +48,14 @@ revision history.
 - **Estimate:** 4–8 h (backend probing outside the process or a safe-mode fallback, a software
   renderer path). Needs a tester with the hardware. **Beta blocker.**
 
-### No soak or long-session testing
-- **Evidence:** unit tests (504), PPTX malformed/fuzz tests and the command panic guard exist; no
-  random command sequences over big decks, no memory or undo-depth soak.
-- **Impact:** unknown crash and slowdown rate in long sessions.
-- **Estimate:** 4–8 h.
+### Soak testing is new
+- **Evidence:** `crates/ui-egui/src/ui_soak_tests.rs` drives the whole window with seeded random
+  clicks, drags, keys (plain, Ctrl, Shift), typing and scrolling over the sample deck, checking
+  document validity, bounded undo/journal/thumbnail/texture caches, zero caught command and
+  render panics (`Session::panics_caught`, `deckcraft_render::panics_caught`) and a mean frame
+  under 250 ms; 4 × 3000-action runs are clean. Engine-level command soak: PR #502.
+- **Impact:** long-session crash rate is sampled in CI; RSS is not measured directly.
+- **Estimate:** 1–2 h (RSS sampling per platform).
 
 ## File formats
 

From 36ec1dc0cac15fdbab8c90b60bff52b27f6f19a2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:13:36 +0300
Subject: [PATCH 150/376] Format Shape: 3-D Format and 3-D Rotation controls

shape.effects gains `threeD`: top and bottom bevel (preset, width,
height), depth, contour, material, lighting, camera preset, X/Y/Z
rotation, distance from ground, and reset. The settings are read from and
written back to the shape's kept a:scene3d / a:sp3d XML (new
cmd::three_d), so they render through the existing camera and bevel code
and survive a PPTX save; extrusion and contour colours are kept as is.

The `bevel` key used to set only Effects::bevel, which neither the
renderer nor the PPTX writer reads, so a bevel set from the app vanished
on save; it now goes through the same path.

The Effects page of the Format Shape pane gets 3-D Format and 3-D
Rotation sections.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/mod.rs     |   1 +
 crates/engine/src/cmd/shape.rs   |  17 +-
 crates/engine/src/cmd/three_d.rs | 304 +++++++++++++++++++++++++++++++
 crates/engine/src/tests.rs       |  50 +++++
 crates/ui-egui/src/panes.rs      |  75 ++++++++
 docs/ui-parity.md                |   2 +-
 6 files changed, 445 insertions(+), 4 deletions(-)
 create mode 100644 crates/engine/src/cmd/three_d.rs

diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..0e2f78a1 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -16,6 +16,7 @@ pub mod shape;
 pub mod slide;
 pub mod table;
 pub mod text;
+pub mod three_d;
 pub mod transition;
 
 use deckcraft_geom::Xfrm;
diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..9fcc6c4b 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -60,7 +60,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Shape Effects",
             ["Shape Format", "Shape Styles"],
             None,
-            "{shadow?: none|outer|inner|perspective|{color, blur, dist, dir}, glow?: none|{color, radius}, softEdges?: pt, reflection?: none|tight|half|full, bevel?: none|circle|…, reset?, ids?}",
+            "{shadow?: none|outer|inner|perspective|{color, blur, dist, dir}, glow?: none|{color, radius}, softEdges?: pt, reflection?: none|tight|half|full, bevel?: none|circle|…, threeD?: {camera?: preset, rotX?, rotY?, rotZ?: deg, z?: pt, bevelTop?, bevelBottom?: none|circle|…, bevelTopW?, bevelTopH?, bevelBottomW?, bevelBottomH?, depth?, contour?: pt, material?, lighting?, reset?: true}, reset?, ids?}",
             has_selection,
             effects
         ),
@@ -449,6 +449,7 @@ fn effects(s: &mut Session, p: &Value) -> Result<Value> {
         "full" => Some(Reflection { blur: 0.5, start_alpha: 0.5, end_alpha: 0.0, end_pos: 0.9, dist: 4.0 }),
         _ => Some(Reflection { blur: 0.5, start_alpha: 0.5, end_alpha: 0.0, end_pos: 0.35, dist: 0.0 }),
     });
+    let three_d = p.get("threeD").filter(|v| v.is_object());
     let bevel = str_param(p, "bevel").map(|b| if b == "none" { None } else { Some(b.to_string()) });
     edit_shapes(s, p, "shape.effects", |sh| {
         if reset {
@@ -481,8 +482,18 @@ fn effects(s: &mut Session, p: &Value) -> Result<Value> {
         if let Some(r) = &refl {
             e.reflection.clone_from(r);
         }
-        if let Some(b) = &bevel {
-            e.bevel.clone_from(b);
+        if bevel.is_some() || three_d.is_some() {
+            let mut s3 = e.raw3d.as_deref().map(super::three_d::Shape3d::parse).unwrap_or_default();
+            if let Some(b) = &bevel {
+                s3.apply(&json!({"bevelTop": b.as_deref().unwrap_or("none")}));
+            }
+            if let Some(t) = three_d {
+                if t.get("reset").and_then(Value::as_bool) == Some(true) {
+                    s3 = super::three_d::Shape3d::default();
+                }
+                s3.apply(t);
+            }
+            super::three_d::store(e, &s3);
         }
         Ok(())
     })
diff --git a/crates/engine/src/cmd/three_d.rs b/crates/engine/src/cmd/three_d.rs
new file mode 100644
index 00000000..fe53450b
--- /dev/null
+++ b/crates/engine/src/cmd/three_d.rs
@@ -0,0 +1,304 @@
+//! Format Shape ▸ 3-D Format and 3-D Rotation: a shape's `a:scene3d` / `a:sp3d`, kept as XML on
+//! the model (`Effects::raw3d`), read into fields, changed, and written back.
+
+use serde_json::Value;
+
+/// Camera presets PowerPoint offers (3-D Rotation ▸ Presets).
+pub const CAMERAS: &[&str] = &[
+    "orthographicFront",
+    "isometricTopUp",
+    "isometricTopDown",
+    "isometricBottomUp",
+    "isometricBottomDown",
+    "isometricLeftUp",
+    "isometricLeftDown",
+    "isometricRightUp",
+    "isometricRightDown",
+    "obliqueTopLeft",
+    "obliqueTopRight",
+    "obliqueBottomLeft",
+    "obliqueBottomRight",
+    "perspectiveFront",
+    "perspectiveLeft",
+    "perspectiveRight",
+    "perspectiveAbove",
+    "perspectiveBelow",
+    "perspectiveAboveLeftFacing",
+    "perspectiveAboveRightFacing",
+    "perspectiveContrastingLeftFacing",
+    "perspectiveContrastingRightFacing",
+    "perspectiveHeroicLeftFacing",
+    "perspectiveHeroicRightFacing",
+    "perspectiveHeroicExtremeLeftFacing",
+    "perspectiveHeroicExtremeRightFacing",
+    "perspectiveRelaxed",
+    "perspectiveRelaxedModerately",
+];
+
+/// Bevel presets (`ST_BevelPresetType`).
+pub const BEVELS: &[&str] =
+    &["circle", "relaxedInset", "cross", "coolSlant", "angle", "softRound", "convex", "slope", "divot", "riblet", "hardEdge", "artDeco"];
+
+/// Materials (`ST_PresetMaterialType`).
+pub const MATERIALS: &[&str] =
+    &["warmMatte", "matte", "plastic", "metal", "dkEdge", "softEdge", "flat", "legacyWireframe", "powder", "translucentPowder", "clear", "softmetal"];
+
+/// Light rigs (`ST_LightRigType`) PowerPoint offers.
+pub const LIGHTS: &[&str] = &[
+    "threePt",
+    "balanced",
+    "soft",
+    "harsh",
+    "flood",
+    "contrasting",
+    "morning",
+    "sunrise",
+    "sunset",
+    "chilly",
+    "freezing",
+    "flat",
+    "twoPt",
+    "glow",
+    "brightRoom",
+];
+
+/// One bevel: preset, width and height in points.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Bevel {
+    pub preset: String,
+    pub w: f64,
+    pub h: f64,
+}
+
+/// The 3-D settings of a shape.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Shape3d {
+    pub camera: String,
+    /// Camera rotation (X, Y, Z in degrees, as PowerPoint shows them), when set.
+    pub rot: Option<(f64, f64, f64)>,
+    pub light: String,
+    pub light_dir: String,
+    pub top: Option<Bevel>,
+    pub bottom: Option<Bevel>,
+    /// Depth (extrusion), contour width and distance from ground, in points.
+    pub depth: f64,
+    pub contour: f64,
+    pub z: f64,
+    pub material: String,
+    /// `a:extrusionClr` / `a:contourClr` XML, kept as is.
+    pub colors: String,
+}
+
+impl Default for Shape3d {
+    fn default() -> Self {
+        Shape3d {
+            camera: "orthographicFront".into(),
+            rot: None,
+            light: "threePt".into(),
+            light_dir: "t".into(),
+            top: None,
+            bottom: None,
+            depth: 0.0,
+            contour: 0.0,
+            z: 0.0,
+            material: "warmMatte".into(),
+            colors: String::new(),
+        }
+    }
+}
+
+/// The start tags of `raw` as (local name, tag text), in order.
+fn tags(raw: &str) -> Vec<(&str, &str)> {
+    let mut out = Vec::new();
+    let mut rest = raw;
+    while let Some(i) = rest.find('<') {
+        let Some(t) = rest.get(i + 1..) else { break };
+        let end = t.find('>').unwrap_or(t.len());
+        let tag = t.get(..end).unwrap_or("");
+        rest = t.get(end..).unwrap_or("");
+        if tag.starts_with('/') || tag.starts_with('?') || tag.starts_with('!') {
+            continue;
+        }
+        let name = tag.split(|c: char| c.is_whitespace() || c == '/').next().unwrap_or("");
+        let local = name.rsplit(':').next().unwrap_or(name);
+        out.push((local, tag));
+    }
+    out
+}
+
+fn attr<'a>(tag: &'a str, name: &str) -> Option<&'a str> {
+    let key = format!(" {name}=\"");
+    let s = tag.find(&key)? + key.len();
+    let rest = tag.get(s..)?;
+    rest.get(..rest.find('"')?)
+}
+
+fn num(tag: &str, name: &str) -> Option<f64> {
+    attr(tag, name).and_then(|v| v.parse::<f64>().ok()).filter(|v| v.is_finite())
+}
+
+const EMU: f64 = 12700.0;
+const ANGLE: f64 = 60000.0;
+
+/// An `a:`-prefixed element `local` (with its children) cut from `raw`, if there is one.
+fn element(raw: &str, local: &str) -> Option<String> {
+    let open = format!("<a:{local}");
+    let close = format!("</a:{local}>");
+    let i = raw.find(&open)?;
+    let j = raw.get(i..)?.find(&close)? + i + close.len();
+    raw.get(i..j).map(str::to_string)
+}
+
+impl Shape3d {
+    /// Reads kept 3-D XML; unknown parts take their defaults.
+    pub fn parse(raw: &str) -> Shape3d {
+        let mut s = Shape3d::default();
+        let mut in_camera = false;
+        for (name, tag) in tags(raw) {
+            match name {
+                "camera" => {
+                    s.camera = attr(tag, "prst").unwrap_or("orthographicFront").to_string();
+                    in_camera = !tag.ends_with('/');
+                }
+                "rot" if in_camera => {
+                    let d = |n| num(tag, n).unwrap_or(0.0) / ANGLE;
+                    s.rot = Some((d("lon"), d("lat"), d("rev")));
+                    in_camera = false;
+                }
+                "lightRig" => {
+                    in_camera = false;
+                    s.light = attr(tag, "rig").unwrap_or("threePt").to_string();
+                    s.light_dir = attr(tag, "dir").unwrap_or("t").to_string();
+                }
+                "sp3d" => {
+                    in_camera = false;
+                    s.depth = num(tag, "extrusionH").unwrap_or(0.0) / EMU;
+                    s.contour = num(tag, "contourW").unwrap_or(0.0) / EMU;
+                    s.z = num(tag, "z").unwrap_or(0.0) / EMU;
+                    s.material = attr(tag, "prstMaterial").unwrap_or("warmMatte").to_string();
+                }
+                "bevelT" | "bevelB" => {
+                    let b = Bevel {
+                        preset: attr(tag, "prst").unwrap_or("circle").to_string(),
+                        w: num(tag, "w").unwrap_or(76200.0) / EMU,
+                        h: num(tag, "h").unwrap_or(76200.0) / EMU,
+                    };
+                    if name == "bevelT" {
+                        s.top = Some(b);
+                    } else {
+                        s.bottom = Some(b);
+                    }
+                }
+                _ => {}
+            }
+        }
+        s.colors = ["extrusionClr", "contourClr"].iter().filter_map(|n| element(raw, n)).collect();
+        s
+    }
+
+    /// Whether this is a flat shape with no 3-D at all.
+    pub fn is_flat(&self) -> bool {
+        self.camera == "orthographicFront"
+            && self.rot.is_none_or(|(x, y, z)| x == 0.0 && y == 0.0 && z == 0.0)
+            && self.top.is_none()
+            && self.bottom.is_none()
+            && self.depth == 0.0
+            && self.contour == 0.0
+            && self.z == 0.0
+    }
+
+    /// The `a:scene3d` and `a:sp3d` XML, or `None` for a flat shape.
+    pub fn to_xml(&self) -> Option<String> {
+        if self.is_flat() {
+            return None;
+        }
+        let e = |pt: f64| (pt * EMU).round() as i64;
+        let mut x = format!("<a:scene3d><a:camera prst=\"{}\"", self.camera);
+        match self.rot {
+            Some((rx, ry, rz)) => {
+                let a = |d: f64| (d.rem_euclid(360.0) * ANGLE).round() as i64 % 21_600_000;
+                x += &format!("><a:rot lat=\"{}\" lon=\"{}\" rev=\"{}\"/></a:camera>", a(ry), a(rx), a(rz));
+            }
+            None => x += "/>",
+        }
+        x += &format!("<a:lightRig rig=\"{}\" dir=\"{}\"/></a:scene3d><a:sp3d", self.light, self.light_dir);
+        if self.z != 0.0 {
+            x += &format!(" z=\"{}\"", e(self.z));
+        }
+        if self.depth > 0.0 {
+            x += &format!(" extrusionH=\"{}\"", e(self.depth));
+        }
+        if self.contour > 0.0 {
+            x += &format!(" contourW=\"{}\"", e(self.contour));
+        }
+        if self.material != "warmMatte" {
+            x += &format!(" prstMaterial=\"{}\"", self.material);
+        }
+        x += ">";
+        for (tag, b) in [("bevelT", &self.top), ("bevelB", &self.bottom)] {
+            if let Some(b) = b {
+                x += &format!("<a:{tag} w=\"{}\" h=\"{}\" prst=\"{}\"/>", e(b.w), e(b.h), b.preset);
+            }
+        }
+        x += &self.colors;
+        x += "</a:sp3d>";
+        Some(x)
+    }
+
+    /// Applies `{camera?, rotX?, rotY?, rotZ?, z?, bevelTop?, bevelTopW?, bevelTopH?, bevelBottom?,
+    /// bevelBottomW?, bevelBottomH?, depth?, contour?, material?, lighting?, lightAngle?}`.
+    pub fn apply(&mut self, p: &Value) {
+        let f = |k: &str| p.get(k).and_then(Value::as_f64).filter(|v| v.is_finite());
+        let pick = |k: &str, list: &[&str]| p.get(k).and_then(Value::as_str).filter(|v| list.contains(v)).map(str::to_string);
+        if let Some(c) = pick("camera", CAMERAS) {
+            self.camera = c;
+            // A preset sets its own angles.
+            self.rot = None;
+        }
+        let (rx, ry, rz) = (f("rotX"), f("rotY"), f("rotZ"));
+        if rx.is_some() || ry.is_some() || rz.is_some() {
+            let (ox, oy, oz) = self.rot.unwrap_or((0.0, 0.0, 0.0));
+            let d = |v: Option<f64>, o: f64| v.map_or(o, |v| v.rem_euclid(360.0));
+            self.rot = Some((d(rx, ox), d(ry, oy), d(rz, oz)));
+        }
+        if let Some(v) = f("z") {
+            self.z = v.clamp(-1584.0, 1584.0);
+        }
+        for (key, slot) in [("bevelTop", &mut self.top), ("bevelBottom", &mut self.bottom)] {
+            match p.get(key).and_then(Value::as_str) {
+                Some("none") => *slot = None,
+                Some(b) if BEVELS.contains(&b) => {
+                    let old = slot.take().unwrap_or(Bevel { preset: String::new(), w: 6.0, h: 6.0 });
+                    *slot = Some(Bevel { preset: b.to_string(), ..old });
+                }
+                _ => {}
+            }
+            if let Some(b) = slot.as_mut() {
+                if let Some(w) = f(&format!("{key}W")) {
+                    b.w = w.clamp(0.0, 1584.0);
+                }
+                if let Some(h) = f(&format!("{key}H")) {
+                    b.h = h.clamp(0.0, 1584.0);
+                }
+            }
+        }
+        if let Some(v) = f("depth") {
+            self.depth = v.clamp(0.0, 1584.0);
+        }
+        if let Some(v) = f("contour") {
+            self.contour = v.clamp(0.0, 1584.0);
+        }
+        if let Some(m) = pick("material", MATERIALS) {
+            self.material = m;
+        }
+        if let Some(l) = pick("lighting", LIGHTS) {
+            self.light = l;
+        }
+    }
+}
+
+/// Sets a shape's 3-D settings on its effects, keeping `bevel` (the top bevel's preset) in step.
+pub fn store(e: &mut deckcraft_model::Effects, s: &Shape3d) {
+    e.raw3d = s.to_xml();
+    e.bevel = if e.raw3d.is_some() { s.top.as_ref().map(|b| b.preset.clone()) } else { None };
+}
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..ceb5dd1a 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,53 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn shape_three_d_format_and_rotation_round_trip() {
+    use crate::cmd::three_d::Shape3d;
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100]})).unwrap();
+    let fx = |s: &Session| s.doc().unwrap().selected_shapes()[0].effects.clone().unwrap_or_default();
+    // The old `bevel` key now writes real 3-D XML, so it is drawn and saved.
+    s.execute("shape.effects", &json!({"bevel": "angle"})).unwrap();
+    let e = fx(&s);
+    assert_eq!(e.bevel.as_deref(), Some("angle"));
+    assert!(e.raw3d.as_deref().is_some_and(|r| r.contains("bevelT") && r.contains("prst=\"angle\"")));
+    s.execute(
+        "shape.effects",
+        &json!({"threeD": {"bevelTopW": 9, "bevelBottom": "circle", "depth": 20, "contour": 2, "material": "metal",
+            "lighting": "harsh", "camera": "isometricTopUp", "rotX": 30, "rotY": -20, "z": 5, "bogus": 1}}),
+    )
+    .unwrap();
+    // Unknown names and non-finite numbers are ignored.
+    s.execute("shape.effects", &json!({"threeD": {"material": "gold", "depth": f64::NAN, "camera": 7}})).unwrap();
+    let want = fx(&s).raw3d.map(|r| Shape3d::parse(&r)).unwrap();
+    assert_eq!(want.top.as_ref().map(|b| (b.preset.as_str(), b.w, b.h)), Some(("angle", 9.0, 6.0)));
+    assert_eq!(want.bottom.as_ref().map(|b| b.preset.as_str()), Some("circle"));
+    assert_eq!((want.depth, want.contour, want.z), (20.0, 2.0, 5.0));
+    assert_eq!((want.material.as_str(), want.light.as_str(), want.camera.as_str()), ("metal", "harsh", "isometricTopUp"));
+    assert_eq!(want.rot, Some((30.0, 340.0, 0.0)));
+    // PPTX save and reopen keeps every setting.
+    let bytes = cmd::file::save_bytes(&s.doc().unwrap().doc, "pptx").unwrap();
+    s.execute("file.openBytes", &json!({"name": "d.pptx", "data": cmd::base64_encode(&bytes)})).unwrap();
+    let back = s.doc().unwrap().doc.slides.iter().flat_map(|sl| sl.shapes.iter()).find_map(|sh| sh.effects.as_ref()?.raw3d.clone());
+    assert_eq!(Shape3d::parse(&back.unwrap()), want);
+}
+
+#[test]
+fn three_d_reset_and_flat_shapes_drop_the_xml() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100]})).unwrap();
+    let fx = |s: &Session| s.doc().unwrap().selected_shapes()[0].effects.clone().unwrap_or_default();
+    s.execute("shape.effects", &json!({"threeD": {"rotZ": 15, "depth": 4}})).unwrap();
+    assert!(fx(&s).raw3d.is_some());
+    s.execute("shape.effects", &json!({"threeD": {"reset": true}})).unwrap();
+    assert_eq!((fx(&s).raw3d, fx(&s).bevel), (None, None));
+    // Keeps colours it doesn't model.
+    let raw = "<a:scene3d><a:camera prst=\"orthographicFront\"/><a:lightRig rig=\"threePt\" dir=\"t\"/></a:scene3d><a:sp3d extrusionH=\"12700\"><a:extrusionClr><a:srgbClr val=\"FF0000\"/></a:extrusionClr></a:sp3d>";
+    let mut s3 = cmd::three_d::Shape3d::parse(raw);
+    s3.apply(&json!({"depth": 3}));
+    assert!(s3.to_xml().unwrap().contains("<a:extrusionClr><a:srgbClr val=\"FF0000\"/></a:extrusionClr>"));
+}
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..63c5e48b 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -150,6 +150,8 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
             if ui.add(egui::Slider::new(&mut s, 0.0..=50.0).text("size (pt)")).drag_stopped() {
                 run(app, "shape.effects", json!({"softEdges": s}));
             }
+            let raw3d = sh.effects.as_ref().and_then(|e| e.raw3d.clone());
+            three_d_options(app, ui, sh.id.0, raw3d.as_deref());
             if ui.button("Reset Effects").clicked() {
                 run(app, "shape.effects", json!({"reset": true}));
             }
@@ -339,6 +341,79 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
     }
 }
 
+/// "perspectiveHeroicLeftFacing" → "Perspective heroic left facing".
+fn preset_label(name: &str) -> String {
+    let mut out = String::new();
+    for (i, c) in name.chars().enumerate() {
+        if i == 0 {
+            out.extend(c.to_uppercase());
+        } else if c.is_uppercase() {
+            out.push(' ');
+            out.extend(c.to_lowercase());
+        } else {
+            out.push(c);
+        }
+    }
+    out
+}
+
+/// A drop-down of `options`; picking one runs `shape.effects` with `{threeD: {key: option}}`.
+fn three_d_combo(app: &mut SlideApp, ui: &mut Ui, id: u32, label: &str, key: &str, cur: &str, options: &[&str]) {
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(90.0, 20.0), egui::Label::new(label));
+        egui::ComboBox::from_id_salt(("3d", id, key)).selected_text(preset_label(cur)).width(170.0).show_ui(ui, |ui| {
+            for o in options {
+                if ui.selectable_label(*o == cur, preset_label(o)).clicked() {
+                    run(app, "shape.effects", json!({"threeD": {key: o}}));
+                }
+            }
+        });
+    });
+}
+
+/// A number field running `shape.effects` with `{threeD: {key: value}}` when it changes.
+fn three_d_drag(app: &mut SlideApp, ui: &mut Ui, label: &str, value: f64, suffix: &str, key: &str) {
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(90.0, 20.0), egui::Label::new(label));
+        let mut v = value;
+        let r = ui.add(egui::DragValue::new(&mut v).suffix(suffix).max_decimals(1));
+        if r.drag_stopped() || r.lost_focus() || (r.changed() && !r.dragged()) {
+            run(app, "shape.effects", json!({"threeD": {key: v}}));
+        }
+    });
+}
+
+/// Format Shape ▸ Effects ▸ 3-D Format and 3-D Rotation.
+fn three_d_options(app: &mut SlideApp, ui: &mut Ui, id: u32, raw: Option<&str>) {
+    use deckcraft_engine::cmd::three_d::{BEVELS, CAMERAS, LIGHTS, MATERIALS, Shape3d};
+    let s3 = raw.map(Shape3d::parse).unwrap_or_default();
+    let with_none: Vec<&str> = std::iter::once("none").chain(BEVELS.iter().copied()).collect();
+    ui.add_space(6.0);
+    ui.label(egui::RichText::new("3-D Format").font(theme::bold(13.0)));
+    for (label, key, b) in [("Top bevel", "bevelTop", &s3.top), ("Bottom bevel", "bevelBottom", &s3.bottom)] {
+        three_d_combo(app, ui, id, label, key, b.as_ref().map_or("none", |b| b.preset.as_str()), &with_none);
+        if let Some(b) = b {
+            three_d_drag(app, ui, "   Width", b.w, " pt", &format!("{key}W"));
+            three_d_drag(app, ui, "   Height", b.h, " pt", &format!("{key}H"));
+        }
+    }
+    three_d_drag(app, ui, "Depth", s3.depth, " pt", "depth");
+    three_d_drag(app, ui, "Contour", s3.contour, " pt", "contour");
+    three_d_combo(app, ui, id, "Material", "material", &s3.material, MATERIALS);
+    three_d_combo(app, ui, id, "Lighting", "lighting", &s3.light, LIGHTS);
+    ui.add_space(6.0);
+    ui.label(egui::RichText::new("3-D Rotation").font(theme::bold(13.0)));
+    three_d_combo(app, ui, id, "Presets", "camera", &s3.camera, CAMERAS);
+    let (rx, ry, rz) = s3.rot.unwrap_or((0.0, 0.0, 0.0));
+    three_d_drag(app, ui, "X Rotation", rx, "°", "rotX");
+    three_d_drag(app, ui, "Y Rotation", ry, "°", "rotY");
+    three_d_drag(app, ui, "Z Rotation", rz, "°", "rotZ");
+    three_d_drag(app, ui, "Distance from ground", s3.z, " pt", "z");
+    if ui.add_enabled(raw.is_some(), egui::Button::new("Reset 3-D")).clicked() {
+        run(app, "shape.effects", json!({"threeD": {"reset": true}}));
+    }
+}
+
 fn background(app: &mut SlideApp, ui: &mut Ui) {
     let sc = scheme(app);
     let bg = app.session.active().and_then(|d| d.current_slide().and_then(|s| s.background.clone()));
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..709f6771 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -58,7 +58,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 
 | Pane / dialog | PowerPoint | DeckCraft |
 |---|---|---|
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
+| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, 3-D format and rotation (bevels, depth, contour, material, lighting, camera presets, X/Y/Z rotation), size; thin picture/texture options |
 | Format Background pane | yes | yes |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |

From 7432c61665ca72f002b5b4b9db844ba6c8ebf46c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:14:46 +0300
Subject: [PATCH 151/376] Slides: reuse slides from another presentation
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Home › New Slide gains Reuse Slides… and Reuse Slides (Keep Source
Formatting)…, backed by a new slide.reuse command that inserts the
slides of a .pptx or .deckcraft file (all, a list, or a range) after the
current slide in one undo step. By default each slide moves to the
destination layout with the same name or kind, so it takes this deck's
theme; keepFormatting brings the source master and its layouts along.
Pictures, media and sounds are copied under fresh media ids, so ids
that clash between the two decks no longer mix up pictures, and shape
ids are renumbered with animations, triggers and connector ends
following them.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/mod.rs   |   2 +
 crates/engine/src/cmd/reuse.rs | 226 +++++++++++++++++++++++++++++++++
 crates/pptx/tests/roundtrip.rs |  63 +++++++++
 crates/ui-egui/src/lib.rs      |  16 +++
 crates/ui-egui/src/ribbon.rs   |   8 ++
 docs/gaps.md                   |   2 +-
 docs/parity-checklist.md       |   2 +-
 7 files changed, 317 insertions(+), 2 deletions(-)
 create mode 100644 crates/engine/src/cmd/reuse.rs

diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..7cd60555 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -10,6 +10,7 @@ pub mod insert;
 pub mod inspect;
 pub mod media;
 pub mod merge;
+pub mod reuse;
 pub mod review;
 pub mod selection;
 pub mod shape;
@@ -128,6 +129,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(file::specs());
         v.extend(edit::specs());
         v.extend(slide::specs());
+        v.extend(reuse::specs());
         v.extend(insert::specs());
         v.extend(shape::specs());
         v.extend(arrange::specs());
diff --git a/crates/engine/src/cmd/reuse.rs b/crates/engine/src/cmd/reuse.rs
new file mode 100644
index 00000000..d5e31b11
--- /dev/null
+++ b/crates/engine/src/cmd/reuse.rs
@@ -0,0 +1,226 @@
+//! Home ▸ New Slide ▸ Reuse Slides: insert slides from another presentation.
+//!
+//! The slides take the destination's look by default (each one moves to the destination layout
+//! with the same name, else the same kind); with `keepFormatting` the source master and its
+//! layouts come along. Pictures, media and sounds are copied under fresh ids, and shape ids are
+//! renumbered with animations, triggers and connector ends following them.
+
+use std::collections::HashMap;
+use std::sync::Arc;
+
+use deckcraft_model::{LayoutId, MasterId, MediaId, Presentation, ShapeId, ShapeKind, Slide, SlideId};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![cmd!(
+        "slide.reuse",
+        "Reuse Slides…",
+        ["Home", "Slides", "New Slide"],
+        None,
+        "{path? | data: base64, name?; slides?: [index] (0-based, default all); keepFormatting?: bool (default false: use the destination theme); at?: index (default after the current slide)}",
+        has_doc,
+        reuse
+    )]
+}
+
+/// Keys under which the model stores a [`MediaId`] (pictures, media, posters, previews, sounds).
+const MEDIA_KEYS: [&str; 4] = ["media", "poster", "preview", "sound"];
+
+/// Rewrite every media id in `v` through `map`.
+fn remap_media(v: &mut Value, map: &HashMap<u32, u32>, depth: usize) {
+    if depth > 256 {
+        return;
+    }
+    match v {
+        Value::Object(o) => {
+            for (k, x) in o.iter_mut() {
+                if MEDIA_KEYS.contains(&k.as_str())
+                    && let Some(n) = x.as_u64().and_then(|n| u32::try_from(n).ok())
+                {
+                    if let Some(to) = map.get(&n) {
+                        *x = json!(to);
+                    }
+                    continue;
+                }
+                remap_media(x, map, depth + 1);
+            }
+        }
+        Value::Array(a) => a.iter_mut().for_each(|x| remap_media(x, map, depth + 1)),
+        _ => {}
+    }
+}
+
+/// `value` with its media ids rewritten, via its JSON form.
+fn with_media<T: serde::Serialize + serde::de::DeserializeOwned>(value: &T, map: &HashMap<u32, u32>) -> Result<T> {
+    let mut v = serde_json::to_value(value).map_err(|e| EngineError::Other(e.to_string()))?;
+    remap_media(&mut v, map, 0);
+    serde_json::from_value(v).map_err(|e| EngineError::Other(e.to_string()))
+}
+
+fn shape_ids(shapes: &[deckcraft_model::Shape]) -> Vec<ShapeId> {
+    let mut v = vec![];
+    deckcraft_model::walk(shapes, &mut |sh, _| v.push(sh.id));
+    v
+}
+
+/// Point connector ends at the renumbered shapes.
+fn remap_connectors(shapes: &mut [deckcraft_model::Shape], map: &HashMap<ShapeId, ShapeId>, depth: usize) {
+    if depth > 64 {
+        return;
+    }
+    for sh in shapes {
+        if let ShapeKind::Connector { start, end } = &mut sh.kind {
+            for c in [start, end] {
+                if let Some((id, _)) = c.as_mut() {
+                    *id = map.get(id).copied().unwrap_or(*id);
+                }
+            }
+        }
+        if let Some(ch) = sh.children_mut() {
+            remap_connectors(ch, map, depth + 1);
+        }
+    }
+}
+
+/// Fresh shape ids for `shapes`, and the old → new map.
+fn renumber(doc: &mut Presentation, shapes: &mut [deckcraft_model::Shape]) -> HashMap<ShapeId, ShapeId> {
+    let old = shape_ids(shapes);
+    super::edit::reid(doc, shapes);
+    let map: HashMap<ShapeId, ShapeId> = old.into_iter().zip(shape_ids(shapes)).collect();
+    remap_connectors(shapes, &map, 0);
+    map
+}
+
+/// The destination layout a reused slide moves to: same name, else same kind, else the first.
+fn matching_layout(doc: &Presentation, name: &str, kind: deckcraft_model::LayoutType) -> LayoutId {
+    let all = || doc.masters.iter().flat_map(|m| m.layouts.iter());
+    all()
+        .find(|l| !name.is_empty() && l.name.eq_ignore_ascii_case(name))
+        .or_else(|| all().find(|l| l.kind == kind))
+        .or_else(|| all().next())
+        .map(|l| l.id)
+        .unwrap_or_default()
+}
+
+fn reuse(s: &mut Session, p: &Value) -> Result<Value> {
+    let (name, bytes) = super::insert::media_bytes(p, "slide.reuse")?;
+    let src = super::file::open_presentation(&name, &bytes)?;
+    let n = src.slides.len();
+    let picked: Vec<usize> = match p.get("slides") {
+        Some(Value::Array(a)) => {
+            let mut v = vec![];
+            for x in a {
+                let i = x.as_u64().map(|i| i as usize).filter(|i| *i < n);
+                let i = i.ok_or_else(|| bad("slide.reuse", format!("{name} has {n} slides; {x} isn't one of them (indices count from 0)")))?;
+                if !v.contains(&i) {
+                    v.push(i);
+                }
+            }
+            v
+        }
+        Some(Value::String(t)) if !t.trim().is_empty() => super::file::parse_slide_range(t, n)?,
+        _ => (0..n).collect(),
+    };
+    if picked.is_empty() {
+        return Err(bad("slide.reuse", format!("{name} has no slides to reuse")));
+    }
+    let keep = bool_or(p, "keepFormatting", false);
+    let at = usize_param(p, "at");
+    s.edit(|doc, sel| {
+        let at = at.unwrap_or(sel.slide + 1).min(doc.slides.len());
+        // Media: what the slides use is copied under fresh ids.
+        let mut media_map: HashMap<u32, u32> = HashMap::new();
+        // Keep Source Formatting: bring each source master used, once, with fresh ids.
+        let mut layout_map: HashMap<LayoutId, LayoutId> = HashMap::new();
+        if keep {
+            let mut masters_done: Vec<MasterId> = vec![];
+            for &i in &picked {
+                let Some((m, _)) = src.master_for(&src.slides[i]) else { continue };
+                if masters_done.contains(&m.id) {
+                    continue;
+                }
+                masters_done.push(m.id);
+                let used = serde_json::to_value(m).map_err(|e| EngineError::Other(e.to_string()))?;
+                copy_media(doc, &src, &used, &mut media_map);
+                let mut m: deckcraft_model::Master = with_media(m, &media_map)?;
+                m.id = MasterId(doc.alloc_id());
+                renumber(doc, &mut m.shapes);
+                for l in &mut m.layouts {
+                    let new = LayoutId(doc.alloc_id());
+                    layout_map.insert(l.id, new);
+                    l.id = new;
+                    renumber(doc, &mut l.shapes);
+                }
+                doc.masters.push(Arc::new(m));
+            }
+        }
+        let mut new_ids = vec![];
+        for (k, &i) in picked.iter().enumerate() {
+            let from = &src.slides[i];
+            let used = serde_json::to_value(from.as_ref()).map_err(|e| EngineError::Other(e.to_string()))?;
+            copy_media(doc, &src, &used, &mut media_map);
+            let mut sl: Slide = with_media(from.as_ref(), &media_map)?;
+            sl.id = SlideId(doc.alloc_id());
+            let map = renumber(doc, &mut sl.shapes);
+            for a in &mut sl.animations {
+                a.shape = map.get(&a.shape).copied().unwrap_or(a.shape);
+                a.trigger = a.trigger.map(|t| map.get(&t).copied().unwrap_or(t));
+            }
+            sl.layout = match layout_map.get(&sl.layout) {
+                Some(l) => *l,
+                None => {
+                    let (lname, kind) =
+                        src.layout(from.layout).map(|(_, l)| (l.name.clone(), l.kind)).unwrap_or_else(|| (String::new(), Default::default()));
+                    matching_layout(doc, &lname, kind)
+                }
+            };
+            new_ids.push(sl.id);
+            doc.slides.insert((at + k).min(doc.slides.len()), Arc::new(sl));
+        }
+        sel.slide = (at + new_ids.len()).saturating_sub(1).min(doc.slides.len().saturating_sub(1));
+        sel.slides = new_ids.clone();
+        sel.shapes.clear();
+        sel.text = None;
+        Ok(json!({"slides": new_ids.len(), "ids": new_ids, "from": name, "keepFormatting": keep}))
+    })
+}
+
+/// Copy the source media `used` refers to into `doc` under fresh ids, once each.
+fn copy_media(doc: &mut Presentation, src: &Presentation, used: &Value, map: &mut HashMap<u32, u32>) {
+    let mut ids = vec![];
+    collect_media(used, &mut ids, 0);
+    for id in ids {
+        if map.contains_key(&id) {
+            continue;
+        }
+        if let Some(m) = src.media(MediaId(id)) {
+            let new = doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone());
+            map.insert(id, new.0);
+        }
+    }
+}
+
+/// The media ids `v` refers to.
+fn collect_media(v: &Value, out: &mut Vec<u32>, depth: usize) {
+    if depth > 256 {
+        return;
+    }
+    match v {
+        Value::Object(o) => {
+            for (k, x) in o {
+                if MEDIA_KEYS.contains(&k.as_str())
+                    && let Some(n) = x.as_u64().and_then(|n| u32::try_from(n).ok())
+                {
+                    out.push(n);
+                } else {
+                    collect_media(x, out, depth + 1);
+                }
+            }
+        }
+        Value::Array(a) => a.iter().for_each(|x| collect_media(x, out, depth + 1)),
+        _ => {}
+    }
+}
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..ef7f1ab9 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,66 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+/// Home › New Slide › Reuse Slides: slides from another .pptx land after the current slide with
+/// their pictures (fresh media ids, same bytes) and animations on the renumbered shapes. By
+/// default they take a destination layout; Keep Source Formatting brings the source master.
+#[test]
+fn reuse_slides_from_another_presentation() {
+    use deckcraft_engine::Session;
+    use serde_json::json;
+    let b64 = deckcraft_engine::cmd::base64_encode;
+    // Source: three slides, a picture with an animation on the second.
+    let mut src = Session::with_new();
+    src.execute("slide.new", &json!({})).unwrap();
+    let pic = png(8, 8, [10, 200, 30]);
+    src.execute("insert.picture", &json!({"data": b64(&pic), "name": "green.png"})).unwrap();
+    src.execute("animation.add", &json!({"effect": "fade"})).unwrap();
+    src.execute("slide.new", &json!({})).unwrap();
+    let src_bytes = deckcraft_pptx::export(&src.doc().unwrap().doc).unwrap();
+
+    let mut s = Session::with_new();
+    // Media ids in the two decks overlap; the destination's own picture must stay its own.
+    let red = png(4, 4, [200, 0, 0]);
+    s.execute("insert.picture", &json!({"data": b64(&red), "name": "red.png"})).unwrap();
+    let r = s.execute("slide.reuse", &json!({"data": b64(&src_bytes), "name": "src.pptx", "slides": [1]})).unwrap();
+    assert_eq!(r["slides"], 1, "{r}");
+    let doc = s.doc().unwrap().doc.clone();
+    assert_eq!(doc.slides.len(), 2);
+    assert_eq!(s.doc().unwrap().selection.slide, 1, "the reused slide is selected");
+    let pictures = |sl: &deckcraft_model::Slide| {
+        let mut v = vec![];
+        deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
+            if let deckcraft_model::ShapeKind::Picture { fill } = &sh.kind {
+                v.push(fill.media);
+            }
+        });
+        v
+    };
+    let mine = pictures(&doc.slides[0]);
+    let reused = pictures(&doc.slides[1]);
+    assert_eq!(doc.media(mine[0]).map(|m| m.data.as_slice() == red.as_slice()), Some(true), "own picture untouched");
+    assert_eq!(doc.media(reused[0]).map(|m| m.data.as_slice() == pic.as_slice()), Some(true), "reused picture copied");
+    let anim = &doc.slides[1].animations[0];
+    assert!(doc.slides[1].shapes.iter().any(|sh| sh.id == anim.shape), "animation follows its shape");
+    assert!(doc.layout(doc.slides[1].layout).is_some(), "uses a destination layout");
+    assert_eq!(doc.masters.len(), 1);
+    // The result saves and reopens.
+    let back = deckcraft_pptx::import(&deckcraft_pptx::export(&doc).unwrap()).unwrap();
+    assert_eq!(back.slides.len(), 2);
+
+    // Keep Source Formatting: every slide, and the source master comes along.
+    let r = s.execute("slide.reuse", &json!({"data": b64(&src_bytes), "name": "src.pptx", "keepFormatting": true, "at": 0})).unwrap();
+    assert_eq!(r["slides"], 3);
+    let doc = s.doc().unwrap().doc.clone();
+    assert_eq!(doc.slides.len(), 5);
+    assert_eq!(doc.masters.len(), 2);
+    for sl in &doc.slides[..3] {
+        assert_eq!(doc.layout(sl.layout).map(|(m, _)| m.id), Some(doc.masters[1].id), "source master");
+    }
+    // One undo removes the whole reuse.
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.slides.len(), 2);
+    assert!(s.execute("slide.reuse", &json!({"data": b64(&src_bytes), "name": "src.pptx", "slides": [7]})).is_err());
+    assert!(s.execute("slide.reuse", &json!({"data": b64(&[0u8, 159, 146, 150]), "name": "x.bin"})).is_err());
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..4d3b314e 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -164,6 +164,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.openDialog", "Open…", None, "{purpose?}"),
     ("app.insertPictureDialog", "Picture from File…", None, "{}"),
     ("app.insertAudioDialog", "Audio from File…", None, "{}"),
+    ("app.reuseSlidesDialog", "Reuse Slides…", None, "{keepFormatting?: bool}"),
     ("app.insertVideoDialog", "Video from File…", None, "{}"),
     ("app.saveAsDialog", "Save As…", None, "{}"),
     ("app.exportDialog", "Export…", None, "{}"),
@@ -538,6 +539,7 @@ impl SlideApp {
             "app.openDialog" => self.pick_and_open(),
             "app.insertPictureDialog" => self.pick_and_insert("picture", "insert.picture"),
             "app.insertAudioDialog" => self.pick_and_insert("audio", "insert.audio"),
+            "app.reuseSlidesDialog" => self.pick_and_reuse(p.get("keepFormatting").and_then(Value::as_bool).unwrap_or(false)),
             "app.insertVideoDialog" => self.pick_and_insert("video", "insert.video"),
             "app.saveAsDialog" => self.save_as_dialog("deckcraft"),
             "app.exportDialog" => self.dialog = Some(dialogs::Dialog::new("export")),
@@ -580,6 +582,20 @@ impl SlideApp {
         Ok(())
     }
 
+    /// Home › New Slide › Reuse Slides…: pick a presentation and insert all its slides after the
+    /// current one (desktop only: the browser picker opens what it picks as a document).
+    fn pick_and_reuse(&mut self, keep: bool) {
+        let Some(pick) = self.services.pick_open.as_mut() else {
+            self.set_status("Reuse Slides needs the desktop app".to_string());
+            return;
+        };
+        let Some(path) = pick("open") else { return };
+        match self.session.execute("slide.reuse", &json!({"path": path, "keepFormatting": keep})) {
+            Ok(r) => self.set_status(format!("Inserted {} slides from {path}", r["slides"])),
+            Err(e) => self.set_status(e.to_string()),
+        }
+    }
+
     fn pick_and_insert(&mut self, purpose: &str, cmd: &str) {
         if let Some(pick) = self.services.pick_open.as_mut() {
             if let Some(path) = pick(purpose) {
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..0e4a0e0d 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -380,6 +380,14 @@ fn slides_group(app: &mut SlideApp, ui: &mut Ui) {
                 if ui.button("Slides from Outline…").clicked() {
                     app.dialog = Some(crate::dialogs::Dialog::new("outline"));
                 }
+                let desktop = app.services.pick_open.is_some();
+                for (label, keep) in [("Reuse Slides…", false), ("Reuse Slides (Keep Source Formatting)…", true)] {
+                    let r = ui.add_enabled(desktop, egui::Button::new(label));
+                    if r.clicked() {
+                        run(app, "app.reuseSlidesDialog", json!({"keepFormatting": keep}));
+                    }
+                    r.on_disabled_hover_text("Choosing a presentation to reuse needs the desktop app");
+                }
             });
         }
         rows(ui, |ui| {
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..ecc3d27e 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -184,7 +184,7 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 - **Estimate:** 3–6 h to review, land and round-trip.
 
 ### Smaller missing rows
-Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
+Zoom (summary/section/slide, 6–10 h), reuse slides pane with thumbnails (1–2 h; `slide.reuse` inserts from a file), laser pointer (1–2 h), transition
 sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
 matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..2237d6db 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -68,7 +68,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Files | Export video (MP4) / animated GIF | P2 | M |
 | Files | Print (slides, handouts, notes, outline) | P1 | M |
 | Files | Password protection | P2 | M |
-| Files | Reuse slides from another file | P1 | M |
+| Files | Reuse slides from another file | P1 | P |
 | Files | Drag and drop files onto the window | P1 | D |
 | Files | OpenDocument .odp open/save | P2 | M |
 | Slides | New slide by layout | P0 | D |

From 37bd53c62e0ce3d8068dcae7093472d23e9df531 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:20:09 +0300
Subject: [PATCH 152/376] Home: Replace Fonts dialog and font.replace command
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

font.replace {from, to} renames a font family everywhere it is named
explicitly: runs (latin, east Asian, complex script and symbol faces), end
marks, bullet fonts, list styles of shapes, layouts and masters, the master
text styles, the deck default style, notes, tables and the theme fonts, so
placeholders that follow the theme change too. Names compare
case-insensitively, theme references (+mn-lt) are left alone, a replace that
finds nothing adds no undo step, and missing fonts are recomputed.
font.used lists the families the slides draw in, for the dialog's Replace
list.

Home gets a Replace Fonts… button opening the dialog: Replace (fonts in the
deck), With (type or pick from installed fonts), and it stays open with a
confirmation like PowerPoint's. Ribbon small buttons now expose their label
to accessibility, which the UI test uses to click it.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/text.rs            | 78 ++++++++++++++++++++
 crates/engine/src/fonts.rs               | 90 +++++++++++++++++++++++-
 crates/ui-egui/src/dialogs.rs            | 47 +++++++++++++
 crates/ui-egui/src/lib.rs                |  2 +
 crates/ui-egui/src/replacefonts_tests.rs | 70 ++++++++++++++++++
 crates/ui-egui/src/ribbon.rs             |  5 ++
 crates/ui-egui/src/widgets.rs            |  4 ++
 docs/gaps.md                             |  4 +-
 docs/ui-parity.md                        |  4 +-
 9 files changed, 299 insertions(+), 5 deletions(-)
 create mode 100644 crates/ui-egui/src/replacefonts_tests.rs

diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..1aafb4de 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -13,6 +13,16 @@ use crate::{DocState, Result, Selection, Session, Target, TextSel};
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![
+        cmd!(query "font.used", "Fonts in Presentation", [], None, "{} → [family] (theme fonts resolved)", has_doc, fonts_used),
+        cmd!(
+            "font.replace",
+            "Replace Fonts",
+            ["Home", "Editing", "Replace"],
+            None,
+            "{from, to} — every explicit use of family `from`, theme fonts included → {replaced}",
+            has_doc,
+            replace_font
+        ),
         cmd!(noundo "text.edit", "Edit Text", [], Some("Enter"), "{id?, at?: [paragraph, char], end?: bool, cell?: [row, col], notes?: bool}", has_slide, edit),
         cmd!(noundo "text.exit", "Stop Editing Text", [], None, "{}", has_doc, exit),
         cmd!("text.insert", "Type Text", [], None, "{text} (\\n = new paragraph, \\u000b = line break)", has_text, insert),
@@ -900,3 +910,71 @@ pub(crate) fn format_body(s: &mut Session, f: &(dyn Fn(&mut deckcraft_model::tex
     }
     ok()
 }
+
+fn fonts_used(s: &mut Session, _: &Value) -> Result<Value> {
+    let mut v = crate::fonts::used_fonts(&s.doc()?.doc);
+    v.sort_by_key(|f| f.to_lowercase());
+    Ok(json!(v))
+}
+
+fn replace_font(s: &mut Session, p: &Value) -> Result<Value> {
+    let from = str_param(p, "from").map(str::trim).filter(|x| !x.is_empty()).ok_or_else(|| bad("font.replace", "missing `from`"))?.to_string();
+    let to = str_param(p, "to").map(str::trim).filter(|x| !x.is_empty()).ok_or_else(|| bad("font.replace", "missing `to`"))?.to_string();
+    if to.len() > 256 || to.chars().any(char::is_control) {
+        return Err(bad("font.replace", "`to` is not a font name"));
+    }
+    // Count on a copy first so a replace that finds nothing leaves no undo step.
+    let mut probe = (*s.doc()?.doc).clone();
+    if crate::fonts::replace_font(&mut probe, &from, &to) == 0 {
+        return Ok(json!({"replaced": 0}));
+    }
+    let n = s.edit(|doc, _| Ok(crate::fonts::replace_font(doc, &from, &to)))?;
+    let st = s.doc_mut()?;
+    st.missing_fonts = crate::fonts::missing_fonts(&st.doc);
+    Ok(json!({"replaced": n}))
+}
+
+#[cfg(test)]
+mod replace_font_tests {
+    use serde_json::json;
+
+    use crate::Session;
+
+    fn fonts(s: &mut Session) -> Vec<String> {
+        serde_json::from_value(s.execute("font.used", &json!({})).unwrap()).unwrap()
+    }
+
+    #[test]
+    fn replaces_runs_tables_notes_and_theme_and_undoes() {
+        let mut s = Session::with_new();
+        s.execute("slide.new", &json!({"layout": "titleAndContent", "title": "T", "body": "B"})).unwrap();
+        let theme = s.doc().unwrap().doc.masters[0].theme.fonts.minor.latin.clone();
+        s.execute("insert.textBox", &json!({"rect": [10, 10, 200, 50], "text": "Hello"})).unwrap();
+        s.execute("text.exit", &json!({})).unwrap();
+        s.execute("format.font", &json!({"family": "Comic Neue"})).unwrap();
+        assert!(fonts(&mut s).iter().any(|f| f == "Comic Neue"), "{:?}", fonts(&mut s));
+        let r = s.execute("font.replace", &json!({"from": "comic neue", "to": "Lato"})).unwrap();
+        assert!(r["replaced"].as_u64().unwrap() >= 1, "{r}");
+        let used = fonts(&mut s);
+        assert!(!used.iter().any(|f| f == "Comic Neue") && used.iter().any(|f| f == "Lato"), "{used:?}");
+        // The theme's body font is replaced too, so placeholders follow.
+        s.execute("font.replace", &json!({"from": theme, "to": "Lato"})).unwrap();
+        assert_eq!(s.doc().unwrap().doc.masters[0].theme.fonts.minor.latin, "Lato");
+        assert!(s.doc().unwrap().doc.validate().is_empty());
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert!(fonts(&mut s).iter().any(|f| f == "Comic Neue"));
+    }
+
+    #[test]
+    fn nothing_to_replace_is_no_undo_step_and_bad_names_fail() {
+        let mut s = Session::with_new();
+        let undo = s.doc().unwrap().history.undo.len();
+        assert_eq!(s.execute("font.replace", &json!({"from": "Nope Sans", "to": "Inter"})).unwrap()["replaced"], 0);
+        assert_eq!(s.execute("font.replace", &json!({"from": "+mn-lt", "to": "Inter"})).unwrap()["replaced"], 0);
+        assert_eq!(s.doc().unwrap().history.undo.len(), undo);
+        assert!(s.execute("font.replace", &json!({"from": "", "to": "Inter"})).is_err());
+        assert!(s.execute("font.replace", &json!({"from": "Inter", "to": "a\nb"})).is_err());
+        assert!(s.execute("font.replace", &json!({"from": "Inter"})).is_err());
+    }
+}
diff --git a/crates/engine/src/fonts.rs b/crates/engine/src/fonts.rs
index fcbd2feb..328ad157 100644
--- a/crates/engine/src/fonts.rs
+++ b/crates/engine/src/fonts.rs
@@ -21,7 +21,7 @@ pub fn missing_fonts(p: &Presentation) -> Vec<String> {
 }
 
 /// The families the slides' text runs and bullets are drawn in.
-fn used_fonts(p: &Presentation) -> Vec<String> {
+pub fn used_fonts(p: &Presentation) -> Vec<String> {
     let mut out: Vec<String> = Vec::new();
     let mut add = |f: String| {
         let f = f.trim().to_string();
@@ -63,3 +63,91 @@ fn body_fonts(ctx: &Ctx, s: &Shape, body: &TextBody, add: &mut dyn FnMut(String)
         }
     }
 }
+
+/// Replace the font family `from` with `to` everywhere it is named explicitly: text runs (and
+/// their east Asian, complex script and symbol faces), bullet fonts, paragraph end marks, list
+/// styles of shapes, layouts and masters, the master text styles, the deck default style, speaker
+/// notes, tables and the theme fonts. Names compare case-insensitively; theme references
+/// (`+mn-lt`) are left alone. Returns how many names changed.
+pub fn replace_font(p: &mut Presentation, from: &str, to: &str) -> usize {
+    use std::sync::Arc;
+    let from = from.trim();
+    let to = to.trim();
+    if from.is_empty() || to.is_empty() || from.starts_with('+') || from == to {
+        return 0;
+    }
+    let mut n = 0usize;
+    let mut fix = |f: &mut Option<String>| {
+        if f.as_deref().is_some_and(|x| x.trim().eq_ignore_ascii_case(from)) {
+            *f = Some(to.to_string());
+            n = n.saturating_add(1);
+        }
+    };
+    replace_list(&mut p.default_text_style, &mut fix);
+    for slide in &mut p.slides {
+        let sl = Arc::make_mut(slide);
+        replace_shapes(&mut sl.shapes, &mut fix);
+        replace_body(&mut sl.notes, &mut fix);
+    }
+    let mut theme_hits = 0usize;
+    let masters = p.masters.iter_mut().chain(p.notes_master.iter_mut()).chain(p.handout_master.iter_mut());
+    for m in masters {
+        let m = Arc::make_mut(m);
+        replace_shapes(&mut m.shapes, &mut fix);
+        for l in [&mut m.title_style, &mut m.body_style, &mut m.other_style] {
+            replace_list(l, &mut fix);
+        }
+        for lay in &mut m.layouts {
+            replace_shapes(&mut lay.shapes, &mut fix);
+        }
+        for set in [&mut m.theme.fonts.major, &mut m.theme.fonts.minor] {
+            for face in [&mut set.latin, &mut set.ea, &mut set.cs].into_iter().chain(set.scripts.iter_mut().map(|s| &mut s.typeface)) {
+                if face.trim().eq_ignore_ascii_case(from) {
+                    *face = to.to_string();
+                    theme_hits = theme_hits.saturating_add(1);
+                }
+            }
+        }
+    }
+    n.saturating_add(theme_hits)
+}
+
+fn replace_shapes(shapes: &mut [Shape], fix: &mut dyn FnMut(&mut Option<String>)) {
+    for s in shapes {
+        if let Some(body) = &mut s.text {
+            replace_body(body, fix);
+        }
+        if let ShapeKind::Table(t) = &mut s.kind {
+            for cell in t.rows.iter_mut().flat_map(|r| &mut r.cells) {
+                replace_body(&mut cell.text, fix);
+            }
+        }
+        if let Some(children) = s.children_mut() {
+            replace_shapes(children, fix);
+        }
+    }
+}
+
+fn replace_body(body: &mut TextBody, fix: &mut dyn FnMut(&mut Option<String>)) {
+    replace_list(&mut body.list_style, fix);
+    for para in &mut body.paragraphs {
+        fix(&mut para.props.bullet_font);
+        replace_run(&mut para.end_props, fix);
+        for run in &mut para.runs {
+            replace_run(&mut run.props, fix);
+        }
+    }
+}
+
+fn replace_list(l: &mut deckcraft_model::text::ListStyle, fix: &mut dyn FnMut(&mut Option<String>)) {
+    for lvl in l.levels.iter_mut().flatten() {
+        fix(&mut lvl.para.bullet_font);
+        replace_run(&mut lvl.run, fix);
+    }
+}
+
+fn replace_run(r: &mut deckcraft_model::text::RunProps, fix: &mut dyn FnMut(&mut Option<String>)) {
+    for f in [&mut r.font, &mut r.font_ea, &mut r.font_cs, &mut r.font_sym] {
+        fix(f);
+    }
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..802b56c0 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -47,6 +47,7 @@ fn title(id: &str) -> &'static str {
         "preferences" => "Preferences",
         "export" => "Export",
         "symbol" => "Symbol",
+        "replaceFonts" => "Replace Font",
         "equation" => "Equation",
         "spelling" => "Spelling",
         "accessibility" => "Accessibility Checker",
@@ -466,6 +467,52 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             }
             ok || cancel
         }
+        "replaceFonts" => {
+            let used: Vec<String> =
+                app.session.execute("font.used", &json!({})).ok().and_then(|v| serde_json::from_value(v).ok()).unwrap_or_default();
+            let mut from = d.get("from", used.first().map(String::as_str).unwrap_or(""));
+            let mut to = d.get("to", "");
+            egui::Grid::new("replace_fonts").num_columns(2).spacing(vec2(10.0, 8.0)).show(ui, |ui| {
+                ui.label("Replace:");
+                egui::ComboBox::from_id_salt("rf_from").width(240.0).selected_text(from.clone()).show_ui(ui, |ui| {
+                    for f in &used {
+                        ui.selectable_value(&mut from, f.clone(), f);
+                    }
+                });
+                ui.end_row();
+                ui.label("With:");
+                ui.vertical(|ui| {
+                    ui.add(egui::TextEdit::singleline(&mut to).desired_width(240.0).hint_text("Font name"));
+                    let needle = to.trim().to_lowercase();
+                    egui::ScrollArea::vertical().max_height(140.0).id_salt("rf_list").show(ui, |ui| {
+                        for f in
+                            crate::ribbon::font_families(app).iter().filter(|f| needle.is_empty() || f.to_lowercase().contains(&needle)).take(200)
+                        {
+                            if ui.selectable_label(f.eq_ignore_ascii_case(to.trim()), f).clicked() {
+                                to = f.clone();
+                            }
+                        }
+                    });
+                });
+                ui.end_row();
+            });
+            if let Some(msg) = d.fields.get("result") {
+                ui.label(egui::RichText::new(msg.clone()).color(Tokens::get(ui.ctx()).text_dim));
+            }
+            d.fields.insert("from".into(), from.clone());
+            d.fields.insert("to".into(), to.clone());
+            let (ok, cancel) = buttons(ui, "Replace");
+            if ok && !from.is_empty() && !to.trim().is_empty() {
+                let n = app.run("font.replace", json!({"from": from, "to": to.trim()})).ok().and_then(|v| v["replaced"].as_u64()).unwrap_or(0);
+                let msg =
+                    if n == 0 { format!("“{from}” isn't used explicitly.") } else { format!("Replaced “{from}” with “{}”.", to.trim()) };
+                d.fields.insert("result".into(), msg);
+                d.fields.remove("from");
+                // Stay open, like PowerPoint, so several fonts can be replaced in a row.
+                return cancel;
+            }
+            cancel
+        }
         "symbol" => {
             ui.label("Click a symbol to insert it at the insertion point.");
             let groups: [(&str, &str); 6] = [
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..ca7405b2 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1129,6 +1129,8 @@ fn js_now() -> f64 {
 
 #[cfg(test)]
 mod ime_tests;
+#[cfg(test)]
+mod replacefonts_tests;
 
 #[cfg(test)]
 mod tests {
diff --git a/crates/ui-egui/src/replacefonts_tests.rs b/crates/ui-egui/src/replacefonts_tests.rs
new file mode 100644
index 00000000..cec694bf
--- /dev/null
+++ b/crates/ui-egui/src/replacefonts_tests.rs
@@ -0,0 +1,70 @@
+//! Home › Replace Fonts…: the dialog lists the deck's fonts and replaces one, as one undo step.
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.textBox", &json!({"rect": [40, 40, 400, 80], "text": "Hello fonts"})).unwrap();
+    s.execute("text.exit", &json!({})).unwrap();
+    s.execute("format.font", &json!({"family": "Comic Neue"})).unwrap();
+    s.execute("format.size", &json!({"size": 40})).unwrap();
+    let app = SlideApp::new(s, Services::default());
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn run_font(h: &Harness<'_, SlideApp>) -> Option<String> {
+    let st = h.state().session.active().unwrap();
+    st.current_slide()
+        .unwrap()
+        .shapes
+        .iter()
+        .find_map(|s| s.text.as_ref())
+        .and_then(|b| b.paragraphs.first())
+        .and_then(|p| p.runs.first())
+        .and_then(|r| r.props.font.clone())
+}
+
+#[test]
+fn ribbon_button_opens_the_dialog_and_replaces() {
+    let mut h = harness();
+    h.get_by_label("Replace Fonts…").click();
+    h.run_steps(3);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("replaceFonts"));
+    // Pick the font to replace and type the new one, the way a person would.
+    if let Some(d) = h.state_mut().dialog.as_mut() {
+        d.fields.insert("from".into(), "Comic Neue".into());
+        d.fields.insert("to".into(), "Lato".into());
+    }
+    h.run_steps(2);
+    h.get_by_label("Replace").click();
+    h.run_steps(3);
+    assert_eq!(run_font(&h).as_deref(), Some("Lato"));
+    // The dialog stays open with a confirmation, like PowerPoint's.
+    assert!(h.query_by_label_contains("Replaced “Comic Neue”").is_some());
+    h.state_mut().session.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(run_font(&h).as_deref(), Some("Comic Neue"));
+}
+
+#[test]
+#[ignore = "writes a screenshot for review"]
+fn screenshot() {
+    let mut h = harness();
+    h.render().unwrap().save("/tmp/replacefonts0.png").unwrap();
+    h.state_mut().dialog = Some(crate::dialogs::Dialog::new("replaceFonts"));
+    h.run_steps(4);
+    h.render().unwrap().save("/tmp/replacefonts.png").unwrap();
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..643c9da0 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -998,6 +998,11 @@ fn home(app: &mut SlideApp, ui: &mut Ui) {
         big(app, ui, Icon::Picture, "Picture", "app.insertPictureDialog", json!({}));
     });
     drawing_group(app, ui);
+    group(ui, |ui| {
+        if small_button(ui, Icon::Fonts, "Replace Fonts…", enabled(app, "font.replace"), false).clicked() {
+            app.dialog = Some(crate::dialogs::Dialog::new("replaceFonts"));
+        }
+    });
     group(ui, |ui| {
         big(app, ui, Icon::DesignIdeas, "Design\nIdeas", "view.pane", json!({"pane": "designer"}));
     });
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 5827b396..972630ac 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -121,6 +121,10 @@ pub fn small_button_ex(ui: &mut Ui, icon: Icon, label: &str, enabled: bool, sele
     let main_rect = Rect::from_min_max(rect.min, pos2(rect.max.x - arrow_w, rect.max.y));
     let main_resp =
         if split { ui.interact(main_rect, resp.id.with("m"), if enabled { Sense::click() } else { Sense::hover() }) } else { resp.clone() };
+    // Screen readers (and UI tests) find the button by its text.
+    if !label.is_empty() {
+        main_resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, label));
+    }
     let arrow_resp = split.then(|| {
         ui.interact(
             Rect::from_min_max(pos2(rect.max.x - arrow_w, rect.min.y), rect.max),
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..fa1afcfb 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -203,8 +203,8 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
+  Action Settings, Print, Insert Object…). 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..f2eda97b 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Replace Fonts, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -137,7 +137,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 |---|---|
 | Native macOS menu bar from `menu_tree()`, filled out to PowerPoint's menu items | 3–5 |
 | Format Shape pane depth | 6–10 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
+| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Action Settings, Print, Insert Object) | 8–14 |
 | Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
 | Grid Options, edit points UI, crop depth | 4–7 |
 | Multiple windows | 3–5 |

From 5eef9fb55acf3312dc87973d3a2aec74103cecaf Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:21:57 +0300
Subject: [PATCH 153/376] Pictures: compress pictures to a target resolution
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Picture Format › Adjust gains Compress Pictures, with PowerPoint's
options: HD 330, Print 220, Web 150 or E-mail 96 ppi, apply to the
selected pictures or all, and delete cropped areas. The new
picture.compress command downsamples each PNG, JPEG, BMP, TIFF or WebP
picture to the pixels its shown size needs at that resolution (JPEG
stays JPEG at quality 85, the rest become PNG), cuts away cropped areas
when asked, and only replaces a picture when the result is smaller or a
crop was removed. Originals nothing else uses are dropped so the saved
file shrinks; one shared with a picture that wasn't compressed stays.
One undo step restores everything.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/compress.rs | 253 ++++++++++++++++++++++++++++++
 crates/engine/src/cmd/mod.rs      |   2 +
 crates/pptx/tests/roundtrip.rs    |  45 ++++++
 crates/ui-egui/src/ribbon.rs      |  41 +++++
 docs/gaps.md                      |   2 +-
 docs/parity-checklist.md          |   2 +-
 6 files changed, 343 insertions(+), 2 deletions(-)
 create mode 100644 crates/engine/src/cmd/compress.rs

diff --git a/crates/engine/src/cmd/compress.rs b/crates/engine/src/cmd/compress.rs
new file mode 100644
index 00000000..01da57eb
--- /dev/null
+++ b/crates/engine/src/cmd/compress.rs
@@ -0,0 +1,253 @@
+//! Picture Format ▸ Adjust ▸ Compress Pictures: downsample pictures to a target resolution for
+//! the size they are shown at, and optionally delete their cropped-away areas.
+
+use std::collections::{HashMap, HashSet};
+use std::sync::Arc;
+
+use deckcraft_model::style::PictureFill;
+use deckcraft_model::{MediaId, Presentation, Shape, ShapeId, ShapeKind};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![cmd!(
+        "picture.compress",
+        "Compress Pictures",
+        ["Picture Format", "Adjust"],
+        None,
+        "{ppi?: 330|220|150|96 (default 220), deleteCropped?: bool (default true), all?: bool (every picture in the presentation; default the selected pictures), ids?} → {pictures, before, after}",
+        has_doc,
+        compress
+    )]
+}
+
+/// A picture compressed for one shape: new bytes, content type and the crop it now needs.
+struct Packed {
+    bytes: Vec<u8>,
+    content_type: &'static str,
+    crop: [f64; 4],
+}
+
+/// Whether `crop` cuts something away (and only cuts: negative values pad, and are kept).
+fn real_crop(c: &[f64; 4]) -> bool {
+    c.iter().all(|v| (0.0..1.0).contains(v)) && c.iter().any(|v| *v > 0.0) && c[0] + c[2] < 1.0 && c[1] + c[3] < 1.0
+}
+
+/// Compress `data` for a picture shown `w_pt` × `h_pt` with `crop`, at `ppi`. `None` when the
+/// format isn't a raster we re-encode (SVG, EMF, GIF…) or nothing would get smaller.
+fn pack(data: &[u8], crop: [f64; 4], w_pt: f64, h_pt: f64, ppi: f64, delete_cropped: bool) -> Option<Packed> {
+    use image::ImageFormat as F;
+    let format = image::guess_format(data).ok()?;
+    if !matches!(format, F::Png | F::Jpeg | F::Bmp | F::Tiff | F::WebP) {
+        return None;
+    }
+    let mut img = image::load_from_memory_with_format(data, format).ok()?;
+    let (iw, ih) = (img.width() as f64, img.height() as f64);
+    if iw < 1.0 || ih < 1.0 || iw * ih > 400_000_000.0 {
+        return None;
+    }
+    let cut = delete_cropped && real_crop(&crop);
+    let mut new_crop = crop;
+    // The share of the image that is visible across and down.
+    let (mut fx, mut fy) = ((1.0 - crop[0] - crop[2]).max(0.01), (1.0 - crop[1] - crop[3]).max(0.01));
+    if cut {
+        let x = (crop[0] * iw).floor() as u32;
+        let y = (crop[1] * ih).floor() as u32;
+        let w = ((fx * iw).round() as u32).clamp(1, img.width() - x.min(img.width() - 1));
+        let h = ((fy * ih).round() as u32).clamp(1, img.height() - y.min(img.height() - 1));
+        img = img.crop_imm(x, y, w, h);
+        new_crop = [0.0; 4];
+        (fx, fy) = (1.0, 1.0);
+    } else if !crop.iter().all(|v| v.is_finite()) {
+        return None;
+    }
+    // Pixels needed for the whole (possibly still cropped) image at `ppi`.
+    let need_w = (w_pt.abs() / 72.0 * ppi / fx).ceil().max(1.0);
+    let need_h = (h_pt.abs() / 72.0 * ppi / fy).ceil().max(1.0);
+    let k = (need_w / img.width() as f64).max(need_h / img.height() as f64);
+    let resized = k < 1.0;
+    if resized {
+        let w = ((img.width() as f64 * k).round() as u32).max(1);
+        let h = ((img.height() as f64 * k).round() as u32).max(1);
+        img = img.resize_exact(w, h, image::imageops::FilterType::Lanczos3);
+    }
+    if !resized && !cut {
+        return None;
+    }
+    let alpha = img.color().has_alpha() && img.to_rgba8().pixels().any(|p| p.0[3] < 255);
+    let mut out = std::io::Cursor::new(Vec::new());
+    let content_type = if format == F::Jpeg && !alpha {
+        let rgb = img.to_rgb8();
+        image::codecs::jpeg::JpegEncoder::new_with_quality(&mut out, 85).encode_image(&rgb).ok()?;
+        "image/jpeg"
+    } else {
+        img.write_to(&mut out, F::Png).ok()?;
+        "image/png"
+    };
+    let bytes = out.into_inner();
+    // Never make a picture bigger just to resample it; deleting a crop is worth it regardless.
+    if bytes.len() >= data.len() && !cut {
+        return None;
+    }
+    Some(Packed { bytes, content_type, crop: new_crop })
+}
+
+/// Picture shapes in `shapes` (groups included) that `want` accepts.
+fn pictures_mut<'a>(shapes: &'a mut [Shape], want: &dyn Fn(ShapeId) -> bool, out: &mut Vec<&'a mut Shape>, depth: usize) {
+    if depth > 64 {
+        return;
+    }
+    for sh in shapes {
+        if matches!(sh.kind, ShapeKind::Picture { .. }) && want(sh.id) {
+            out.push(sh);
+        } else if let Some(ch) = sh.children_mut() {
+            pictures_mut(ch, want, out, depth + 1);
+        }
+    }
+}
+
+/// Media ids anything in the presentation still refers to (everything but the media list).
+fn referenced_media(doc: &Presentation) -> HashSet<u32> {
+    fn scan(v: &Value, out: &mut HashSet<u32>, depth: usize) {
+        if depth > 256 {
+            return;
+        }
+        match v {
+            Value::Object(o) => {
+                for (k, x) in o {
+                    match (k.as_str(), x.as_u64()) {
+                        ("media" | "poster" | "preview" | "sound", Some(n)) => {
+                            out.insert(n as u32);
+                        }
+                        _ => scan(x, out, depth + 1),
+                    }
+                }
+            }
+            Value::Array(a) => a.iter().for_each(|x| scan(x, out, depth + 1)),
+            _ => {}
+        }
+    }
+    let mut out = HashSet::new();
+    let mut shell = doc.clone();
+    shell.media.clear();
+    if let Ok(v) = serde_json::to_value(&shell) {
+        scan(&v, &mut out, 0);
+    }
+    // Embedded fonts are (name, id) pairs.
+    out.extend(doc.embedded_fonts.iter().map(|(_, m)| m.0));
+    out
+}
+
+fn compress(s: &mut Session, p: &Value) -> Result<Value> {
+    let ppi = f64_param(p, "ppi").unwrap_or(220.0);
+    if !ppi.is_finite() || !(36.0..=1200.0).contains(&ppi) {
+        return Err(bad("picture.compress", "`ppi` must be between 36 and 1200 (PowerPoint offers 330, 220, 150 and 96)"));
+    }
+    let delete_cropped = bool_or(p, "deleteCropped", true);
+    let all = bool_or(p, "all", false);
+    let ids: HashSet<ShapeId> = if all { HashSet::new() } else { targets(s, p)?.into_iter().collect() };
+    if !all && ids.is_empty() {
+        return Err(bad("picture.compress", "select a picture, or pass all: true"));
+    }
+    let current = s.doc()?.selection.slide;
+    s.edit(|doc, _| {
+        let want = |id: ShapeId| all || ids.contains(&id);
+        let mut before = 0usize;
+        let mut after = 0usize;
+        let mut count = 0usize;
+        let mut changed: Vec<MediaId> = vec![];
+        // The same picture at the same size and crop compresses once.
+        let mut cache: HashMap<(u32, [u64; 4], u64, u64), Option<(MediaId, [f64; 4], usize)>> = HashMap::new();
+        let range: Vec<usize> = if all { (0..doc.slides.len()).collect() } else { vec![current] };
+        for i in range {
+            let Some(slide) = doc.slides.get(i).cloned() else { continue };
+            let mut slide = slide.as_ref().clone();
+            let mut pics = vec![];
+            pictures_mut(&mut slide.shapes, &want, &mut pics, 0);
+            let mut touched = false;
+            for sh in pics {
+                let (w, h) = sh.xfrm.map(|x| (x.w, x.h)).unwrap_or((0.0, 0.0));
+                let ShapeKind::Picture { fill } = &mut sh.kind else { continue };
+                let PictureFill { media, crop, .. } = fill.clone();
+                let key = (media.0, crop.map(f64::to_bits), w.to_bits(), h.to_bits());
+                let hit = match cache.get(&key) {
+                    Some(v) => *v,
+                    None => {
+                        let packed = doc.media(media).filter(|m| !m.data.is_empty()).and_then(|m| {
+                            let old = m.data.len();
+                            pack(&m.data, crop, w, h, ppi, delete_cropped).map(|pk| (pk, old, m.name.clone()))
+                        });
+                        let v = packed.map(|(pk, old, name)| {
+                            before += old;
+                            after += pk.bytes.len();
+                            let stem = std::path::Path::new(&name).file_stem().map(|x| x.to_string_lossy().to_string()).unwrap_or(name);
+                            let ext = if pk.content_type == "image/jpeg" { "jpg" } else { "png" };
+                            let id = doc.add_media(&format!("{stem}.{ext}"), pk.content_type, pk.bytes);
+                            (id, pk.crop, old)
+                        });
+                        cache.insert(key, v);
+                        v
+                    }
+                };
+                if let Some((id, new_crop, _)) = hit {
+                    changed.push(media);
+                    fill.media = id;
+                    fill.crop = new_crop;
+                    count += 1;
+                    touched = true;
+                }
+            }
+            if touched && let Some(sl) = doc.slides.get_mut(i) {
+                *sl = Arc::new(slide);
+            }
+        }
+        // Drop the originals nothing uses any more, so the saved file actually shrinks.
+        if !changed.is_empty() {
+            let used = referenced_media(doc);
+            doc.media.retain(|m| !changed.contains(&m.id) || used.contains(&m.id.0));
+        }
+        Ok(json!({"pictures": count, "before": before, "after": after, "ppi": ppi}))
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn png(w: u32, h: u32) -> Vec<u8> {
+        let img = image::RgbImage::from_fn(w, h, |x, y| image::Rgb([(x * 7 % 256) as u8, (y * 5 % 256) as u8, ((x ^ y) % 256) as u8]));
+        let mut out = std::io::Cursor::new(Vec::new());
+        image::DynamicImage::ImageRgb8(img).write_to(&mut out, image::ImageFormat::Png).unwrap();
+        out.into_inner()
+    }
+
+    #[test]
+    fn pack_downsamples_to_the_shown_size() {
+        // 2000 px shown at 1 inch: 150 ppi needs 150 px.
+        let pk = pack(&png(2000, 1000), [0.0; 4], 72.0, 36.0, 150.0, true).unwrap();
+        let img = image::load_from_memory(&pk.bytes).unwrap();
+        assert_eq!((img.width(), img.height()), (150, 75));
+        assert_eq!(pk.content_type, "image/png");
+        // Already small enough: nothing to do.
+        assert!(pack(&png(100, 50), [0.0; 4], 72.0, 36.0, 150.0, true).is_none());
+        // Not a raster we re-encode.
+        assert!(pack(b"<svg xmlns='http://www.w3.org/2000/svg'/>", [0.0; 4], 72.0, 72.0, 150.0, true).is_none());
+    }
+
+    #[test]
+    fn pack_deletes_cropped_areas_or_keeps_them() {
+        let src = png(400, 400);
+        // Left half cropped away, shown 2 in wide at 100 ppi → 200 px of the visible half.
+        let pk = pack(&src, [0.5, 0.0, 0.0, 0.0], 144.0, 288.0, 100.0, true).unwrap();
+        assert_eq!(pk.crop, [0.0; 4]);
+        let img = image::load_from_memory(&pk.bytes).unwrap();
+        assert_eq!((img.width(), img.height()), (200, 400));
+        // Keeping the crop: the whole image stays, scaled so the visible half has its pixels.
+        let pk = pack(&src, [0.5, 0.0, 0.0, 0.0], 72.0, 72.0, 100.0, false).unwrap();
+        assert_eq!(pk.crop, [0.5, 0.0, 0.0, 0.0]);
+        let img = image::load_from_memory(&pk.bytes).unwrap();
+        assert_eq!(img.width(), 200);
+    }
+}
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..b26aac01 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -2,6 +2,7 @@
 
 pub mod animation;
 pub mod arrange;
+pub mod compress;
 pub mod design;
 pub mod edit;
 pub mod file;
@@ -142,6 +143,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(review::specs());
         v.extend(inspect::specs());
         v.extend(media::specs());
+        v.extend(compress::specs());
         v
     })
 }
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..d4c8bdfa 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,48 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+/// Picture Format › Compress Pictures: a big picture shown small is downsampled, its original
+/// goes when nothing else uses it, the saved file shrinks, a copy that wasn't compressed keeps
+/// the original, and undo brings everything back.
+#[test]
+fn compress_pictures_shrinks_the_file_and_keeps_shared_originals() {
+    use deckcraft_engine::Session;
+    use serde_json::json;
+    let b64 = deckcraft_engine::cmd::base64_encode;
+    // A noisy 1600 × 1600 picture (doesn't compress away on its own).
+    let big = {
+        let img = image::RgbImage::from_fn(1600, 1600, |x, y| image::Rgb([(x * 31 % 251) as u8, (y * 17 % 253) as u8, ((x * y) % 255) as u8]));
+        let mut out = std::io::Cursor::new(Vec::new());
+        image::DynamicImage::ImageRgb8(img).write_to(&mut out, image::ImageFormat::Png).unwrap();
+        out.into_inner()
+    };
+    let mut s = Session::with_new();
+    s.execute("insert.picture", &json!({"data": b64(&big), "name": "noise.png"})).unwrap();
+    s.execute("shape.resize", &json!({"w": 144, "h": 144})).unwrap();
+    let size_before = deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap().len();
+    let r = s.execute("picture.compress", &json!({"ppi": 150})).unwrap();
+    assert_eq!(r["pictures"], 1, "{r}");
+    let doc = s.doc().unwrap().doc.clone();
+    assert_eq!(doc.media.len(), 1, "the original is gone");
+    let img = image::load_from_memory(&doc.media[0].data).unwrap();
+    assert_eq!((img.width(), img.height()), (300, 300), "2 in at 150 ppi");
+    let size_after = deckcraft_pptx::export(&doc).unwrap().len();
+    assert!(size_after * 4 < size_before, "{size_before} → {size_after}");
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.media[0].data.len(), big.len(), "undo restores the original");
+
+    // A duplicate that isn't compressed still needs the original.
+    s.execute("edit.duplicate", &json!({})).unwrap();
+    let copy = s.doc().unwrap().selection.shapes.clone();
+    let first: Vec<_> = s.doc().unwrap().doc.slides[0].shapes.iter().map(|sh| sh.id).filter(|id| !copy.contains(id)).collect();
+    s.execute("picture.compress", &json!({"ppi": 150, "ids": [first.last().unwrap().0]})).unwrap();
+    let doc = s.doc().unwrap().doc.clone();
+    assert_eq!(doc.media.len(), 2);
+    assert!(doc.media.iter().any(|m| m.data.len() == big.len()), "the copy keeps the original");
+    // All pictures: the copy gets compressed too, and the original goes.
+    s.execute("picture.compress", &json!({"ppi": 150, "all": true})).unwrap();
+    let doc = s.doc().unwrap().doc.clone();
+    assert!(doc.media.iter().all(|m| m.data.len() < big.len() / 4));
+    assert!(s.execute("picture.compress", &json!({"ppi": 5, "all": true})).is_err());
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..2adfa6d8 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2087,6 +2087,10 @@ fn picture_format(app: &mut SlideApp, ui: &mut Ui) {
         rows(ui, |ui| {
             small(app, ui, Icon::ChangePicture, "Change Picture", "app.insertPictureDialog", json!({}));
             small(app, ui, Icon::ResetPicture, "Reset Picture", "picture.reset", json!({}));
+            let (_, r) = small_button_ex(ui, Icon::CompressPictures, "Compress Pictures", enabled(app, "picture.compress"), false, true);
+            if let Some(r) = r {
+                egui::Popup::menu(&r).close_behavior(egui::PopupCloseBehavior::CloseOnClickOutside).width(260.0).show(|ui| compress_menu(app, ui));
+            }
         });
     });
     group(ui, |ui| {
@@ -2420,3 +2424,40 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+/// Compress Pictures options, as in PowerPoint's dialog: resolution, apply to this picture or
+/// all, delete cropped areas. The choices last for the session.
+fn compress_menu(app: &mut SlideApp, ui: &mut Ui) {
+    let id = egui::Id::new("compress_pictures_opts");
+    let (mut ppi, mut only_selected, mut delete_cropped): (u32, bool, bool) = ui.data_mut(|d| d.get_temp(id).unwrap_or((220, true, true)));
+    ui.label(egui::RichText::new("Compression options").strong());
+    ui.checkbox(&mut only_selected, "Apply only to this picture");
+    ui.checkbox(&mut delete_cropped, "Delete cropped areas of pictures");
+    ui.separator();
+    ui.label(egui::RichText::new("Resolution").strong());
+    for (v, label) in [
+        (330, "HD (330 ppi): good quality for high-definition displays"),
+        (220, "Print (220 ppi): excellent quality on most printers and screens"),
+        (150, "Web (150 ppi): good for web pages and projectors"),
+        (96, "E-mail (96 ppi): minimise document size for sharing"),
+    ] {
+        ui.radio_value(&mut ppi, v, label);
+    }
+    ui.data_mut(|d| d.insert_temp(id, (ppi, only_selected, delete_cropped)));
+    ui.separator();
+    if ui.button("Compress").clicked() {
+        let p = json!({"ppi": ppi, "deleteCropped": delete_cropped, "all": !only_selected});
+        match app.session.execute("picture.compress", &p) {
+            Ok(r) => {
+                let kb = |v: &Value| v.as_u64().unwrap_or(0) / 1024;
+                let msg = match r["pictures"].as_u64().unwrap_or(0) {
+                    0 => "Pictures are already at or below that resolution".to_string(),
+                    n => format!("Compressed {n} picture(s): {} KB → {} KB", kb(&r["before"]), kb(&r["after"])),
+                };
+                app.set_status(msg);
+            }
+            Err(e) => app.set_status(e.to_string()),
+        }
+        ui.close();
+    }
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..e4b4b274 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -186,7 +186,7 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 ### Smaller missing rows
 Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
 sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
-matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
+matte), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
 encryption), ink to shape/text (6–10 h), icons and 3-D models (8–14 h, needs an open icon set).
 
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..8595c0f1 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -186,7 +186,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Pictures | Remove background | P2 | M |
 | Pictures | Picture styles and borders | P1 | P |
 | Pictures | Change / reset picture | P1 | D |
-| Pictures | Compress pictures | P2 | M |
+| Pictures | Compress pictures | P2 | D |
 | Pictures | Paste image from clipboard (fails on Windows and Linux, #53) | P0 | P |
 | Pictures | Insert screenshot | P2 | M |
 | Media | Insert audio (any common format) | P0 | D |

From 733522d5286e8fb41ea49903d023fbb7aab2226f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:22:57 +0300
Subject: [PATCH 154/376] =?UTF-8?q?Shapes:=20Edit=20Points=20=E2=80=94=20d?=
 =?UTF-8?q?rag,=20add=20and=20delete=20a=20shape's=20vertices?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

New cmd::points with shape.editPoints (enter/leave; a preset becomes a
freeform in shape-local points), shape.points (vertices in slide points),
shape.movePoint, shape.addPoint (splits a line, quadratic or cubic
segment) and shape.deletePoint. After each change the box is fitted
around the outline and kept in place on the slide, rotation and flips
included. Closing edges are made explicit so they take points too.

On the canvas the edited shape shows its vertices as handles: drag one
(one undo step per drag), Cmd/Ctrl-click a vertex to delete it or the
outline to add one; Escape, Enter or a click elsewhere leaves Edit
Points. Shape Format ▸ Edit Shape gets an Edit Points item.

Not yet: smooth/straight/corner point types and Bézier control handles.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/mod.rs    |   2 +
 crates/engine/src/cmd/points.rs | 559 ++++++++++++++++++++++++++++++++
 crates/engine/src/keys.rs       |   4 +
 crates/engine/src/tests.rs      |  99 ++++++
 crates/engine/src/tools.rs      |  63 ++++
 crates/ui-egui/src/canvas.rs    |  14 +
 crates/ui-egui/src/ribbon.rs    |   5 +
 docs/gaps.md                    |   5 +-
 docs/parity-checklist.md        |   2 +-
 docs/ui-parity.md               |   2 +-
 10 files changed, 751 insertions(+), 4 deletions(-)
 create mode 100644 crates/engine/src/cmd/points.rs

diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..ca3ae8be 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -10,6 +10,7 @@ pub mod insert;
 pub mod inspect;
 pub mod media;
 pub mod merge;
+pub mod points;
 pub mod review;
 pub mod selection;
 pub mod shape;
@@ -133,6 +134,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(arrange::specs());
         v.extend(selection::specs());
         v.extend(merge::specs());
+        v.extend(points::specs());
         v.extend(text::specs());
         v.extend(format::specs());
         v.extend(design::specs());
diff --git a/crates/engine/src/cmd/points.rs b/crates/engine/src/cmd/points.rs
new file mode 100644
index 00000000..164bb58f
--- /dev/null
+++ b/crates/engine/src/cmd/points.rs
@@ -0,0 +1,559 @@
+//! Edit Points (Shape Format ▸ Edit Shape ▸ Edit Points): turn a shape into a freeform and move,
+//! add or delete the vertices of its outline.
+//!
+//! While points are edited every custom path of the shape is kept in shape-local points (its
+//! `w`/`h` equal the shape's size), so a vertex's path coordinates are its offset in the shape.
+//! After each change the shape's box is fitted around the outline again, keeping it in place on
+//! the slide (rotation and flips included).
+
+use deckcraft_geom::{PathEl, Point, Xfrm};
+use deckcraft_model::{CustomPath, Geom, Shape, ShapeId, ShapeKind};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![
+        cmd!(
+            noundo "shape.editPoints",
+            "Edit Points",
+            ["Shape Format", "Insert Shapes", "Edit Shape"],
+            None,
+            "{on?: bool (default: toggle), id?} — enter or leave Edit Points for one selected shape; entering turns a preset into a freeform",
+            has_selection,
+            edit_points
+        ),
+        cmd!(query "shape.points", "Points", [], None, "{id?} → {id, paths: [[[x, y] slide pt]]} vertices of a freeform", has_selection, points),
+        cmd!("shape.movePoint", "Move Point", [], None, "{path?: 0, index, x, y: slide pt, id?}", has_selection, move_point),
+        cmd!(
+            "shape.addPoint",
+            "Add Point",
+            [],
+            None,
+            "{path?: 0, segment: index of the vertex ending it, t?: 0..1 (0.5), id?}",
+            has_selection,
+            add_point
+        ),
+        cmd!("shape.deletePoint", "Delete Point", [], None, "{path?: 0, index, id?}", has_selection, delete_point),
+    ]
+}
+
+/// One path command, in path units.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum Seg {
+    M(Point),
+    L(Point),
+    C(Point, Point, Point),
+    Q(Point, Point),
+    Z,
+}
+
+impl Seg {
+    pub fn end(&self) -> Option<Point> {
+        match self {
+            Seg::M(p) | Seg::L(p) | Seg::C(_, _, p) | Seg::Q(_, p) => Some(*p),
+            Seg::Z => None,
+        }
+    }
+    fn points_mut(&mut self) -> Vec<&mut Point> {
+        match self {
+            Seg::M(p) | Seg::L(p) => vec![p],
+            Seg::C(a, b, p) => vec![a, b, p],
+            Seg::Q(a, p) => vec![a, p],
+            Seg::Z => vec![],
+        }
+    }
+}
+
+/// Parses path data (`M x y L x y C … Q … Z`); malformed commands are skipped.
+pub fn parse(d: &str) -> Vec<Seg> {
+    let toks: Vec<&str> = d.split(|c: char| c.is_whitespace() || c == ',').filter(|t| !t.is_empty()).collect();
+    let num = |i: usize| toks.get(i).and_then(|t| t.parse::<f64>().ok()).filter(|v| v.is_finite());
+    let pt = |i: usize| Some(Point::new(num(i)?, num(i + 1)?));
+    let mut out = Vec::new();
+    let mut i = 0;
+    while i < toks.len() && out.len() < 100_000 {
+        let (seg, n) = match toks.get(i).copied().unwrap_or("") {
+            "M" => (pt(i + 1).map(Seg::M), 3),
+            "L" => (pt(i + 1).map(Seg::L), 3),
+            "C" => ((|| Some(Seg::C(pt(i + 1)?, pt(i + 3)?, pt(i + 5)?)))(), 7),
+            "Q" => ((|| Some(Seg::Q(pt(i + 1)?, pt(i + 3)?)))(), 5),
+            "Z" => (Some(Seg::Z), 1),
+            _ => (None, 1),
+        };
+        // Make a closing edge explicit, so it is a segment that can take points.
+        if matches!(seg, Some(Seg::Z)) {
+            let start = out.iter().rev().find_map(|x| if let Seg::M(p) = x { Some(*p) } else { None });
+            let end = out.last().and_then(Seg::end);
+            if let (Some(a), Some(b)) = (start, end)
+                && (a - b).hypot() > 1e-6
+            {
+                out.push(Seg::L(a));
+            }
+        }
+        if let Some(s) = seg {
+            // A path starts with a move.
+            let s = match (out.is_empty(), s) {
+                (true, Seg::L(p)) => Seg::M(p),
+                (true, Seg::C(..) | Seg::Q(..) | Seg::Z) => {
+                    i += n;
+                    continue;
+                }
+                (_, s) => s,
+            };
+            out.push(s);
+        }
+        i += n;
+    }
+    out
+}
+
+/// Path data for `segs`.
+pub fn write(segs: &[Seg]) -> String {
+    let f = |v: f64| {
+        let s = format!("{:.3}", v);
+        let s = s.trim_end_matches('0').trim_end_matches('.');
+        if s == "-0" { "0".to_string() } else { s.to_string() }
+    };
+    let p = |q: &Point| format!("{} {}", f(q.x), f(q.y));
+    segs.iter()
+        .map(|s| match s {
+            Seg::M(a) => format!("M {}", p(a)),
+            Seg::L(a) => format!("L {}", p(a)),
+            Seg::C(a, b, c) => format!("C {} {} {}", p(a), p(b), p(c)),
+            Seg::Q(a, b) => format!("Q {} {}", p(a), p(b)),
+            Seg::Z => "Z".into(),
+        })
+        .collect::<Vec<_>>()
+        .join(" ")
+}
+
+/// Whether segment `i` ends back on its sub-path's start right before a `Z` (the closing edge of
+/// a closed outline). Its end is the same vertex as the start, not a vertex of its own.
+fn closes_onto_start(segs: &[Seg], i: usize) -> bool {
+    if !matches!(segs.get(i + 1), Some(Seg::Z)) {
+        return false;
+    }
+    let start = segs.get(..=i).and_then(|s| s.iter().rev().find_map(|x| if let Seg::M(p) = x { Some(*p) } else { None }));
+    match (start, segs.get(i).and_then(Seg::end)) {
+        (Some(a), Some(b)) => !matches!(segs.get(i), Some(Seg::M(_))) && (a - b).hypot() < 1e-6,
+        _ => false,
+    }
+}
+
+/// The segments whose end is a vertex, in order.
+pub fn vertices(segs: &[Seg]) -> Vec<usize> {
+    (0..segs.len()).filter(|i| segs.get(*i).and_then(Seg::end).is_some() && !closes_onto_start(segs, *i)).collect()
+}
+
+fn shift(segs: &mut [Seg], i: usize, which: &[usize], d: deckcraft_geom::Vec2) {
+    if let Some(s) = segs.get_mut(i) {
+        let mut pts = s.points_mut();
+        for w in which {
+            if let Some(p) = pts.get_mut(*w) {
+                **p += d;
+            }
+        }
+    }
+}
+
+/// The indices of the points of segment `i` that sit on its end vertex (the end and, for a
+/// cubic, its incoming control point).
+fn end_points(seg: Option<&Seg>) -> &'static [usize] {
+    match seg {
+        Some(Seg::C(..)) => &[1, 2],
+        Some(Seg::Q(..)) => &[1],
+        Some(Seg::M(_) | Seg::L(_)) => &[0],
+        _ => &[],
+    }
+}
+
+/// Moves the vertex ending segment `si` by `d`, with the control points attached to it.
+fn move_vertex(segs: &mut [Seg], si: usize, d: deckcraft_geom::Vec2) {
+    // A closed sub-path's start is also its closing edge's end.
+    let close = if matches!(segs.get(si), Some(Seg::M(_))) {
+        (si + 1..segs.len()).take_while(|j| !matches!(segs.get(*j), Some(Seg::M(_)))).find(|j| closes_onto_start(segs, *j))
+    } else {
+        None
+    };
+    let own = end_points(segs.get(si));
+    shift(segs, si, own, d);
+    // The outgoing curve's first control point follows the vertex.
+    if matches!(segs.get(si + 1), Some(Seg::C(..))) {
+        shift(segs, si + 1, &[0], d);
+    }
+    if let Some(j) = close {
+        let w = end_points(segs.get(j));
+        shift(segs, j, w, d);
+    }
+}
+
+/// The point where segment `si` starts.
+fn seg_start(segs: &[Seg], si: usize) -> Option<Point> {
+    let prev = segs.get(..si)?;
+    match prev.last()? {
+        Seg::Z => prev.iter().rev().find_map(|x| if let Seg::M(p) = x { Some(*p) } else { None }),
+        s => s.end(),
+    }
+}
+
+/// Splits segment `si` at `t`, adding a vertex there. Returns false for a move or close.
+fn split(segs: &mut Vec<Seg>, si: usize, t: f64) -> bool {
+    let Some(p0) = seg_start(segs, si) else { return false };
+    let lerp = |a: Point, b: Point| a.lerp(b, t);
+    let (a, b) = match segs.get(si).copied() {
+        Some(Seg::L(p1)) => (Seg::L(lerp(p0, p1)), Seg::L(p1)),
+        Some(Seg::Q(c, p1)) => {
+            let (m0, m1) = (lerp(p0, c), lerp(c, p1));
+            let m = m0.lerp(m1, t);
+            (Seg::Q(m0, m), Seg::Q(m1, p1))
+        }
+        Some(Seg::C(c1, c2, p1)) => {
+            let (a1, a2, a3) = (lerp(p0, c1), lerp(c1, c2), lerp(c2, p1));
+            let (b1, b2) = (a1.lerp(a2, t), a2.lerp(a3, t));
+            let m = b1.lerp(b2, t);
+            (Seg::C(a1, b1, m), Seg::C(b2, a3, p1))
+        }
+        _ => return false,
+    };
+    if let Some(s) = segs.get_mut(si) {
+        *s = a;
+    }
+    segs.insert(si + 1, b);
+    true
+}
+
+/// Removes the vertex ending segment `si`. A sub-path keeps at least two vertices.
+fn remove_vertex(segs: &mut Vec<Seg>, si: usize) -> bool {
+    // The vertices of `si`'s sub-path.
+    let from = segs.get(..=si).and_then(|s| s.iter().rposition(|x| matches!(x, Seg::M(_)))).unwrap_or(0);
+    let to = (si + 1..segs.len()).find(|j| matches!(segs.get(*j), Some(Seg::M(_)))).unwrap_or(segs.len());
+    let count = vertices(segs).iter().filter(|v| (from..to).contains(*v)).count();
+    if count <= 2 {
+        return false;
+    }
+    if matches!(segs.get(si), Some(Seg::M(_))) {
+        // The next vertex becomes the start; a closed outline's closing edge now ends there.
+        let Some(next) = segs.get(si + 1).and_then(Seg::end) else { return false };
+        segs.remove(si + 1);
+        if let Some(s) = segs.get_mut(si) {
+            *s = Seg::M(next);
+        }
+        let close = (si + 1..segs.len()).take_while(|j| !matches!(segs.get(*j), Some(Seg::M(_)))).find(|j| matches!(segs.get(j + 1), Some(Seg::Z)));
+        if let Some(j) = close
+            && let Some(Seg::L(p) | Seg::C(_, _, p) | Seg::Q(_, p)) = segs.get_mut(j)
+        {
+            *p = next;
+        }
+        return true;
+    }
+    // Merge with the next segment: it now starts where the removed vertex's segment started.
+    match (segs.get(si).copied(), segs.get(si + 1).copied()) {
+        (Some(Seg::C(c1, _, _)), Some(Seg::C(_, c2, p))) => {
+            segs.remove(si + 1);
+            if let Some(s) = segs.get_mut(si) {
+                *s = Seg::C(c1, c2, p);
+            }
+        }
+        _ => {
+            segs.remove(si);
+        }
+    }
+    true
+}
+
+/// Custom paths of a preset shape, in shape-local points.
+fn to_custom(sh: &Shape, w: f64, h: f64) -> Vec<CustomPath> {
+    let geo = deckcraft_render::shape_geometry(sh, w, h);
+    geo.paths
+        .iter()
+        .map(|sp| {
+            let segs: Vec<Seg> = sp
+                .path
+                .elements()
+                .iter()
+                .map(|e| match *e {
+                    PathEl::MoveTo(p) => Seg::M(p),
+                    PathEl::LineTo(p) => Seg::L(p),
+                    PathEl::QuadTo(a, p) => Seg::Q(a, p),
+                    PathEl::CurveTo(a, b, p) => Seg::C(a, b, p),
+                    PathEl::ClosePath => Seg::Z,
+                })
+                .collect();
+            CustomPath { w, h, d: write(&segs), fill: sp.fill, stroke: sp.stroke }
+        })
+        .collect()
+}
+
+/// Rescales every path of a custom geometry to shape-local points.
+fn normalize(paths: &mut [CustomPath], w: f64, h: f64) {
+    for p in paths {
+        let (sx, sy) = (if p.w > 0.0 { w / p.w } else { 1.0 }, if p.h > 0.0 { h / p.h } else { 1.0 });
+        if (sx - 1.0).abs() > 1e-12 || (sy - 1.0).abs() > 1e-12 {
+            let mut segs = parse(&p.d);
+            for s in &mut segs {
+                for q in s.points_mut() {
+                    *q = Point::new(q.x * sx, q.y * sy);
+                }
+            }
+            p.d = write(&segs);
+        }
+        p.w = w;
+        p.h = h;
+    }
+}
+
+/// Fits the box around the outline, keeping the drawing where it is on the slide.
+fn refit(sh: &mut Shape) {
+    let (Some(x), Geom::Custom { paths }) = (sh.xfrm, &mut sh.geom) else { return };
+    let mut all: Vec<Vec<Seg>> = paths.iter().map(|p| parse(&p.d)).collect();
+    let mut bb: Option<deckcraft_geom::Rect> = None;
+    for s in all.iter_mut().flatten() {
+        for q in s.points_mut() {
+            bb = Some(bb.map_or(deckcraft_geom::Rect::from_points(*q, *q), |b| b.union_pt(*q)));
+        }
+    }
+    let Some(bb) = bb else { return };
+    let (w, h) = (bb.width().max(1.0), bb.height().max(1.0));
+    if bb.x0.abs() < 1e-6 && bb.y0.abs() < 1e-6 && (w - x.w).abs() < 1e-6 && (h - x.h).abs() < 1e-6 {
+        return;
+    }
+    let c = x.affine() * Point::new(bb.x0 + w / 2.0, bb.y0 + h / 2.0);
+    let off = deckcraft_geom::Vec2::new(bb.x0, bb.y0);
+    for (p, segs) in paths.iter_mut().zip(&mut all) {
+        for s in segs.iter_mut() {
+            for q in s.points_mut() {
+                *q -= off;
+            }
+        }
+        p.d = write(segs);
+        p.w = w;
+        p.h = h;
+    }
+    sh.xfrm = Some(Xfrm { x: c.x - w / 2.0, y: c.y - h / 2.0, w, h, ..x });
+}
+
+/// The one shape whose points are edited: `id`, or the single selected shape.
+fn target(s: &Session, p: &Value, cmd: &str) -> Result<ShapeId> {
+    let st = s.doc()?;
+    let id = match p.get("id").and_then(Value::as_u64) {
+        Some(i) => ShapeId(i as u32),
+        None => match st.selection.shapes.as_slice() {
+            [one] => *one,
+            _ => return Err(bad(cmd, "select one shape")),
+        },
+    };
+    let sh = st.shape(id).ok_or_else(|| bad(cmd, "no such shape"))?;
+    if !st.shapes().iter().any(|t| t.id == id) {
+        return Err(bad(cmd, "a shape in a group can't have its points edited; ungroup it first"));
+    }
+    if !matches!(sh.kind, ShapeKind::Shape) || sh.is_line() || sh.xfrm.is_none() {
+        return Err(bad(cmd, "only a shape with an outline has points to edit"));
+    }
+    if sh.locked {
+        return Err(bad(cmd, "the shape is locked"));
+    }
+    Ok(id)
+}
+
+/// Makes `id` a freeform in shape-local points (the state Edit Points works in).
+pub(crate) fn prepare(s: &mut Session, id: ShapeId) -> Result<()> {
+    let st = s.doc()?;
+    let Some(sh) = st.shape(id) else { return Ok(()) };
+    let Some(x) = sh.xfrm else { return Ok(()) };
+    let ready = matches!(&sh.geom, Geom::Custom { paths } if paths.iter().all(|p| p.w == x.w && p.h == x.h));
+    if ready {
+        return Ok(());
+    }
+    s.edit(|doc, sel| {
+        let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("shape.editPoints", "no slide"))?;
+        if let Some(sh) = deckcraft_model::find_shape_mut(list, id) {
+            match &mut sh.geom {
+                Geom::Custom { paths } => normalize(paths, x.w, x.h),
+                Geom::Preset { .. } => {
+                    let paths = to_custom(sh, x.w, x.h);
+                    sh.geom = Geom::Custom { paths };
+                }
+            }
+        }
+        Ok(())
+    })
+}
+
+fn edit_points(s: &mut Session, p: &Value) -> Result<Value> {
+    let on = p.get("on").and_then(Value::as_bool).unwrap_or(s.tool.edit_points.is_none());
+    if !on {
+        s.tool.edit_points = None;
+        return Ok(json!({"editing": Value::Null}));
+    }
+    let id = target(s, p, "shape.editPoints")?;
+    prepare(s, id)?;
+    s.tool.edit_points = Some(id);
+    Ok(json!({"editing": id.0}))
+}
+
+/// Vertices of every path of `sh` in slide points.
+pub fn slide_vertices(doc: &deckcraft_model::Presentation, sel: &crate::Selection, sh: &Shape) -> Vec<Vec<Point>> {
+    let Geom::Custom { paths } = &sh.geom else { return vec![] };
+    let x = xfrm_of(doc, sel, sh);
+    let a = x.affine();
+    paths
+        .iter()
+        .map(|p| {
+            let (sx, sy) = (if p.w > 0.0 { x.w / p.w } else { 1.0 }, if p.h > 0.0 { x.h / p.h } else { 1.0 });
+            let segs = parse(&p.d);
+            vertices(&segs).iter().filter_map(|i| segs.get(*i).and_then(Seg::end)).map(|q| a * Point::new(q.x * sx, q.y * sy)).collect()
+        })
+        .collect()
+}
+
+fn points(s: &mut Session, p: &Value) -> Result<Value> {
+    let st = s.doc()?;
+    let id = match p.get("id").and_then(Value::as_u64) {
+        Some(i) => ShapeId(i as u32),
+        None => *st.selection.shapes.first().ok_or_else(|| bad("shape.points", "select a shape"))?,
+    };
+    let sh = st.shape(id).ok_or_else(|| bad("shape.points", "no such shape"))?;
+    let paths: Vec<Vec<[f64; 2]>> =
+        slide_vertices(&st.doc, &st.selection, sh).into_iter().map(|v| v.into_iter().map(|q| [q.x, q.y]).collect()).collect();
+    Ok(json!({"id": id.0, "paths": paths}))
+}
+
+/// Runs `f` on the segments of path `path` of `id` (in shape-local points), then refits the box.
+/// `f` gets the segment indices of the vertices and returns whether it changed anything.
+pub(crate) fn edit_path(
+    s: &mut Session,
+    id: ShapeId,
+    path: usize,
+    cmd: &'static str,
+    f: impl Fn(&mut Vec<Seg>, &[usize], &Xfrm) -> Result<bool>,
+) -> Result<Value> {
+    prepare(s, id)?;
+    s.edit(|doc, sel| {
+        let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad(cmd, "no slide"))?;
+        let sh = deckcraft_model::find_shape_mut(list, id).ok_or_else(|| bad(cmd, "no such shape"))?;
+        let x = sh.xfrm.ok_or_else(|| bad(cmd, "the shape has no position"))?;
+        let Geom::Custom { paths } = &mut sh.geom else { return Err(bad(cmd, "not a freeform")) };
+        let cp = paths.get_mut(path).ok_or_else(|| bad(cmd, "no such path"))?;
+        let mut segs = parse(&cp.d);
+        let vs = vertices(&segs);
+        if f(&mut segs, &vs, &x)? {
+            cp.d = write(&segs);
+            refit(sh);
+        }
+        Ok(())
+    })?;
+    ok()
+}
+
+fn index_param(p: &Value, key: &str, cmd: &str) -> Result<usize> {
+    p.get(key).and_then(Value::as_u64).map(|v| v as usize).ok_or_else(|| bad(cmd, format!("give `{key}`")))
+}
+
+fn move_point(s: &mut Session, p: &Value) -> Result<Value> {
+    let id = target(s, p, "shape.movePoint")?;
+    let path = p.get("path").and_then(Value::as_u64).unwrap_or(0) as usize;
+    let index = index_param(p, "index", "shape.movePoint")?;
+    let to = match (f64_param(p, "x"), f64_param(p, "y")) {
+        (Some(x), Some(y)) if x.is_finite() && y.is_finite() => Point::new(x.clamp(-1e5, 1e5), y.clamp(-1e5, 1e5)),
+        _ => return Err(bad("shape.movePoint", "give `x` and `y` in slide points")),
+    };
+    edit_path(s, id, path, "shape.movePoint", move |segs, vs, x| {
+        let si = *vs.get(index).ok_or_else(|| bad("shape.movePoint", "no such point"))?;
+        let local = x.affine().inverse() * to;
+        let Some(cur) = segs.get(si).and_then(Seg::end) else { return Ok(false) };
+        move_vertex(segs, si, local - cur);
+        Ok(true)
+    })
+}
+
+fn add_point(s: &mut Session, p: &Value) -> Result<Value> {
+    let id = target(s, p, "shape.addPoint")?;
+    let path = p.get("path").and_then(Value::as_u64).unwrap_or(0) as usize;
+    let seg = index_param(p, "segment", "shape.addPoint")?;
+    let t = f64_param(p, "t").filter(|t| t.is_finite()).unwrap_or(0.5).clamp(0.01, 0.99);
+    edit_path(s, id, path, "shape.addPoint", move |segs, vs, _| {
+        let si = *vs.get(seg).ok_or_else(|| bad("shape.addPoint", "no such segment"))?;
+        // The closing edge of a closed outline ends at the start: split it, not the start.
+        let si = if matches!(segs.get(si), Some(Seg::M(_))) {
+            (si + 1..segs.len()).find(|j| closes_onto_start(segs, *j)).ok_or_else(|| bad("shape.addPoint", "the first point ends no segment"))?
+        } else {
+            si
+        };
+        if split(segs, si, t) { Ok(true) } else { Err(bad("shape.addPoint", "no segment ends at that point")) }
+    })
+}
+
+fn delete_point(s: &mut Session, p: &Value) -> Result<Value> {
+    let id = target(s, p, "shape.deletePoint")?;
+    let path = p.get("path").and_then(Value::as_u64).unwrap_or(0) as usize;
+    let index = index_param(p, "index", "shape.deletePoint")?;
+    edit_path(s, id, path, "shape.deletePoint", move |segs, vs, _| {
+        let si = *vs.get(index).ok_or_else(|| bad("shape.deletePoint", "no such point"))?;
+        if remove_vertex(segs, si) { Ok(true) } else { Err(bad("shape.deletePoint", "an outline keeps at least two points")) }
+    })
+}
+
+/// The vertex of `sh` near slide point `p`: (path, index).
+pub fn vertex_at(doc: &deckcraft_model::Presentation, sel: &crate::Selection, sh: &Shape, p: Point, tol: f64) -> Option<(usize, usize)> {
+    for (pi, vs) in slide_vertices(doc, sel, sh).iter().enumerate() {
+        for (i, q) in vs.iter().enumerate() {
+            if (*q - p).hypot() <= tol {
+                return Some((pi, i));
+            }
+        }
+    }
+    None
+}
+
+/// The segment of `sh`'s outline near slide point `p`: (path, index of the vertex ending it, t).
+pub fn segment_at(doc: &deckcraft_model::Presentation, sel: &crate::Selection, sh: &Shape, p: Point, tol: f64) -> Option<(usize, usize, f64)> {
+    let Geom::Custom { paths } = &sh.geom else { return None };
+    let x = xfrm_of(doc, sel, sh);
+    let local = x.affine().inverse() * p;
+    let mut best: Option<(f64, usize, usize, f64)> = None;
+    for (pi, cp) in paths.iter().enumerate() {
+        let (sx, sy) = (if cp.w > 0.0 { x.w / cp.w } else { 1.0 }, if cp.h > 0.0 { x.h / cp.h } else { 1.0 });
+        let segs = parse(&cp.d);
+        let vs = vertices(&segs);
+        for si in 0..segs.len() {
+            let Some(p0) = seg_start(&segs, si) else { continue };
+            let at = |t: f64| -> Option<Point> {
+                let q = match segs.get(si)? {
+                    Seg::L(p1) => p0.lerp(*p1, t),
+                    Seg::Q(c, p1) => p0.lerp(*c, t).lerp(c.lerp(*p1, t), t),
+                    Seg::C(c1, c2, p1) => {
+                        let (a, b, c) = (p0.lerp(*c1, t), c1.lerp(*c2, t), c2.lerp(*p1, t));
+                        a.lerp(b, t).lerp(b.lerp(c, t), t)
+                    }
+                    _ => return None,
+                };
+                Some(Point::new(q.x * sx, q.y * sy))
+            };
+            // The vertex that ends this segment (a closing edge ends on the start).
+            let end_vertex = if closes_onto_start(&segs, si) {
+                let start = segs.get(..si).and_then(|s| s.iter().rposition(|x| matches!(x, Seg::M(_))));
+                start.and_then(|m| vs.iter().position(|v| *v == m))
+            } else {
+                vs.iter().position(|v| *v == si)
+            };
+            let Some(ev) = end_vertex else { continue };
+            for k in 1..32 {
+                let t = k as f64 / 32.0;
+                if let Some(q) = at(t) {
+                    let d = (q - local).hypot();
+                    if d <= tol && best.is_none_or(|b| d < b.0) {
+                        best = Some((d, pi, ev, t));
+                    }
+                }
+            }
+        }
+    }
+    best.map(|(_, pi, ev, t)| (pi, ev, t))
+}
+
+/// Moves vertex `index` of path `path` of `id` to slide point `to` (pointer drags).
+pub(crate) fn move_point_raw(s: &mut Session, id: ShapeId, path: usize, index: usize, to: Point) -> Result<Value> {
+    move_point(s, &json!({"id": id.0, "path": path, "index": index, "x": to.x, "y": to.y}))
+}
diff --git a/crates/engine/src/keys.rs b/crates/engine/src/keys.rs
index 665cc22e..49e75057 100644
--- a/crates/engine/src/keys.rs
+++ b/crates/engine/src/keys.rs
@@ -57,6 +57,10 @@ impl Session {
         if self.tool.drawing_freeform() && matches!(k, "enter" | "return" | "escape") {
             return self.finish_freeform(false);
         }
+        if self.tool.edit_points.is_some() && matches!(k, "enter" | "return" | "escape") {
+            self.tool.edit_points = None;
+            return Ok(json!({"handled": true, "command": "shape.editPoints"}));
+        }
         if editing && let Some((id, params)) = self.text_key(k, mods) {
             let r = self.execute(id, &params)?;
             return Ok(json!({"handled": true, "command": id, "result": r}));
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..de931942 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,102 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn edit_points_turns_a_preset_into_a_freeform_and_moves_adds_deletes() {
+    use deckcraft_model::Geom;
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100]})).unwrap();
+    let r = s.execute("shape.editPoints", &json!({})).unwrap();
+    let id = r["editing"].as_u64().unwrap();
+    assert!(matches!(s.doc().unwrap().selected_shapes()[0].geom, Geom::Custom { .. }));
+    let pts =
+        |s: &mut Session| -> Vec<[f64; 2]> { serde_json::from_value(s.execute("shape.points", &json!({})).unwrap()["paths"][0].clone()).unwrap() };
+    let near = |a: [f64; 2], b: [f64; 2]| (a[0] - b[0]).abs() < 1e-6 && (a[1] - b[1]).abs() < 1e-6;
+    let v = pts(&mut s);
+    assert_eq!(v.len(), 4, "{v:?}");
+    assert!(near(v[0], [100.0, 100.0]) && near(v[2], [300.0, 200.0]));
+    // Drag the bottom-right corner out: the box grows to fit, other points stay on the slide.
+    s.execute("shape.movePoint", &json!({"index": 2, "x": 350, "y": 260})).unwrap();
+    let v = pts(&mut s);
+    assert!(near(v[0], [100.0, 100.0]) && near(v[2], [350.0, 260.0]) && near(v[3], [100.0, 200.0]), "{v:?}");
+    let x = s.doc().unwrap().selected_shapes()[0].xfrm.unwrap();
+    assert!((x.w - 250.0).abs() < 1e-6 && (x.h - 160.0).abs() < 1e-6);
+    // Move the first point up-left: the box moves with it.
+    s.execute("shape.movePoint", &json!({"index": 0, "x": 80, "y": 90})).unwrap();
+    let x = s.doc().unwrap().selected_shapes()[0].xfrm.unwrap();
+    assert!((x.x - 80.0).abs() < 1e-6 && (x.y - 90.0).abs() < 1e-6);
+    assert!(near(pts(&mut s)[0], [80.0, 90.0]));
+    // Add a point in the middle of the closing edge (from the last point back to the first) and
+    // of the top edge, then delete one.
+    s.execute("shape.addPoint", &json!({"segment": 0})).unwrap();
+    assert_eq!(pts(&mut s).len(), 5);
+    s.execute("shape.addPoint", &json!({"segment": 1, "t": 0.5})).unwrap();
+    let v = pts(&mut s);
+    assert_eq!(v.len(), 6);
+    assert!(near(v[1], [(80.0 + 300.0) / 2.0, (90.0 + 100.0) / 2.0]), "{v:?}");
+    s.execute("shape.deletePoint", &json!({"index": 1})).unwrap();
+    s.execute("shape.deletePoint", &json!({"index": 0})).unwrap();
+    assert_eq!(pts(&mut s).len(), 4);
+    // Bad input is an error, not a panic; an outline keeps two points.
+    assert!(s.execute("shape.movePoint", &json!({"index": 99, "x": 1, "y": 1})).is_err());
+    assert!(s.execute("shape.movePoint", &json!({"index": 0, "x": f64::NAN, "y": 1})).is_err());
+    s.execute("shape.deletePoint", &json!({"index": 0})).unwrap();
+    s.execute("shape.deletePoint", &json!({"index": 0})).unwrap();
+    assert!(s.execute("shape.deletePoint", &json!({"index": 0})).is_err());
+    // Each edit is one undo step.
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(pts(&mut s).len(), 3);
+    // It saves as custom geometry.
+    let bytes = cmd::file::save_bytes(&s.doc().unwrap().doc, "pptx").unwrap();
+    s.execute("file.openBytes", &json!({"name": "e.pptx", "data": cmd::base64_encode(&bytes)})).unwrap();
+    let back = s.doc().unwrap().doc.slides.iter().flat_map(|sl| sl.shapes.iter()).find(|sh| sh.id.0 == id as u32).map(|sh| sh.geom.clone());
+    assert!(matches!(back, Some(Geom::Custom { .. })), "{back:?}");
+}
+
+#[test]
+fn edit_points_with_the_pointer_and_curves() {
+    use crate::tools::{Mods, PointerEvent, PointerKind};
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "ellipse", "rect": [100, 100, 200, 100]})).unwrap();
+    s.execute("shape.editPoints", &json!({"on": true})).unwrap();
+    let pts =
+        |s: &mut Session| -> Vec<[f64; 2]> { serde_json::from_value(s.execute("shape.points", &json!({})).unwrap()["paths"][0].clone()).unwrap() };
+    let v = pts(&mut s);
+    assert!(v.len() >= 4, "{v:?}");
+    let ev = |kind, x: f64, y: f64, cmd: bool| PointerEvent { kind, x, y, mods: Mods { cmd, ..Default::default() }, ..Default::default() };
+    // Drag the first vertex 30 pt left: one undo step.
+    let [x0, y0] = v[0];
+    s.pointer(ev(PointerKind::Down, x0, y0, false)).unwrap();
+    s.pointer(ev(PointerKind::Drag, x0 - 15.0, y0, false)).unwrap();
+    s.pointer(ev(PointerKind::Drag, x0 - 30.0, y0, false)).unwrap();
+    s.pointer(ev(PointerKind::Up, x0 - 30.0, y0, false)).unwrap();
+    let w = pts(&mut s);
+    assert!((w[0][0] - (x0 - 30.0)).abs() < 1e-3 && (w[0][1] - y0).abs() < 1e-3, "{w:?}");
+    assert!(w[1..].iter().zip(&v[1..]).all(|(a, b)| (a[0] - b[0]).abs() < 1e-3 && (a[1] - b[1]).abs() < 1e-3));
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert!((pts(&mut s)[0][0] - x0).abs() < 1e-3);
+    // Ctrl-click a vertex deletes it.
+    let n = pts(&mut s).len();
+    let [x1, y1] = pts(&mut s)[1];
+    s.pointer(ev(PointerKind::Down, x1, y1, true)).unwrap();
+    s.pointer(ev(PointerKind::Up, x1, y1, true)).unwrap();
+    assert_eq!(pts(&mut s).len(), n - 1);
+    // Escape leaves Edit Points; then a click on empty slide doesn't touch the shape.
+    s.key("Escape", Mods::default()).unwrap();
+    assert!(s.tool.edit_points.is_none());
+}
+
+#[test]
+fn edit_points_path_parse_and_write() {
+    use crate::cmd::points::{Seg, parse, vertices, write};
+    let segs = parse("M 0 0 L 10 0 C 10 5 5 10 0 10 Z junk L");
+    // The closing edge is made explicit; its end is not a vertex of its own.
+    assert_eq!(segs.len(), 5);
+    assert!(matches!(segs[3], Seg::L(_)));
+    assert_eq!(vertices(&segs), vec![0, 1, 2]);
+    assert_eq!(write(&parse(&write(&segs))), write(&segs));
+    assert!(parse("C 1 2 3").is_empty());
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..892fe512 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -76,6 +76,12 @@ pub enum Hit {
         id: ShapeId,
         index: usize,
     },
+    /// A vertex of a shape whose points are being edited.
+    Vertex {
+        id: ShapeId,
+        path: usize,
+        index: usize,
+    },
     /// Line end 0/1 of a line-like shape.
     LineEnd {
         id: ShapeId,
@@ -119,6 +125,11 @@ enum Drag {
         index: usize,
         orig: Xfrm,
     },
+    Vertex {
+        id: ShapeId,
+        path: usize,
+        index: usize,
+    },
     Marquee {
         start: Point,
         add: bool,
@@ -178,6 +189,8 @@ pub struct ToolState {
     pub path_preview: Vec<Point>,
     pub path_smooth: bool,
     pub path_closing: bool,
+    /// The shape in Edit Points: its vertices are handles instead of the box's.
+    pub edit_points: Option<ShapeId>,
 }
 
 impl ToolState {
@@ -185,6 +198,11 @@ impl ToolState {
         self.drag.is_some()
     }
 
+    /// The shape in Edit Points, while it is still the one selected shape.
+    pub fn editing_points(&self, st: &crate::DocState) -> Option<ShapeId> {
+        self.edit_points.filter(|id| st.selection.shapes.as_slice() == [*id] && st.selection.text.is_none() && st.shape(*id).is_some())
+    }
+
     /// A freeform path is being drawn (Enter/Escape/double-click finish it).
     pub fn drawing_freeform(&self) -> bool {
         matches!(self.drag, Some(Drag::Freeform { .. }))
@@ -215,6 +233,13 @@ impl Session {
     /// What's under `p` on the current slide.
     pub fn hit_test(&self, p: Point, tol: f64) -> Option<Hit> {
         let st = self.active()?;
+        // In Edit Points, the edited shape's vertices come first.
+        if let Some(id) = self.tool.editing_points(st)
+            && let Some(sh) = st.shape(id)
+            && let Some((path, index)) = cmd::points::vertex_at(&st.doc, &st.selection, sh, p, tol * 1.6)
+        {
+            return Some(Hit::Vertex { id, path, index });
+        }
         // Handles of selected shapes first.
         if st.selection.text.is_none() || st.selection.shapes.len() == 1 {
             for id in st.selection.shapes.iter().rev() {
@@ -387,6 +412,28 @@ impl Session {
             }
         }
         let hit = self.hit_test(p, tol);
+        // Edit Points: drag a vertex, Ctrl-click one to delete it or the outline to add one;
+        // a click anywhere else leaves Edit Points.
+        if let Some(eid) = self.doc().ok().and_then(|st| self.tool.editing_points(st)) {
+            if let Some(Hit::Vertex { id, path, index }) = hit {
+                if mods.cmd {
+                    return self.execute("shape.deletePoint", &json!({"id": id, "path": path, "index": index}));
+                }
+                self.begin("Edit Points");
+                self.tool.drag = Some(Drag::Vertex { id, path, index });
+                return Ok(json!({"vertex": [path, index]}));
+            }
+            let st = self.doc()?;
+            if let Some(sh) = st.shape(eid)
+                && let Some((path, seg, t)) = cmd::points::segment_at(&st.doc, &st.selection, sh, p, tol * 1.6)
+            {
+                if mods.cmd {
+                    return self.execute("shape.addPoint", &json!({"id": eid, "path": path, "segment": seg, "t": t}));
+                }
+                return Ok(Value::Null);
+            }
+            self.tool.edit_points = None;
+        }
         let st = self.doc()?;
         match hit {
             Some(Hit::Resize { id, handle }) => {
@@ -407,6 +454,8 @@ impl Session {
                 self.begin("Rotate");
                 self.tool.drag = Some(Drag::Rotate { ids, center, start, origs });
             }
+            // Only reached outside Edit Points (handled above).
+            Some(Hit::Vertex { .. }) => {}
             Some(Hit::Adjust { id, index }) => {
                 let orig = st.shape(id).map(|s| xfrm_of(&st.doc, &st.selection, s)).unwrap_or_default();
                 self.begin("Adjust Shape");
@@ -601,6 +650,11 @@ impl Session {
                     Ok(())
                 })?;
             }
+            Drag::Vertex { id, path, index } => {
+                self.tool.drag = Some(Drag::Vertex { id, path, index });
+                self.edit_vertex(id, path, index, p)?;
+                return Ok(Value::Null);
+            }
             Drag::Marquee { start, .. } => {
                 self.tool.marquee = Some(Rect::from_points(start, p));
             }
@@ -661,6 +715,15 @@ impl Session {
         Ok(Value::Null)
     }
 
+    /// Moves a vertex during a drag (one undo step for the whole drag).
+    fn edit_vertex(&mut self, id: ShapeId, path: usize, index: usize, p: Point) -> Result<()> {
+        let r = cmd::points::move_point_raw(self, id, path, index, p);
+        if let Err(e) = r {
+            log::debug!("edit point: {e}");
+        }
+        Ok(())
+    }
+
     fn up(&mut self, p: Point, mods: Mods) -> Result<Value> {
         let drag = self.tool.drag.take();
         self.tool.guides.clear();
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..4dc7b109 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -468,6 +468,20 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
             }
             continue;
         }
+        if app.session.tool.editing_points(st) == Some(sh.id) {
+            // Edit Points: the outline's vertices are the handles.
+            for q in deckcraft_engine::cmd::points::slide_vertices(&st.doc, &st.selection, sh).into_iter().flatten() {
+                let c = xf.to_screen(q);
+                painter.rect(
+                    egui::Rect::from_center_size(c, egui::vec2(7.0, 7.0)),
+                    0.0,
+                    Color32::BLACK,
+                    Stroke::new(1.0, Color32::WHITE),
+                    egui::StrokeKind::Middle,
+                );
+            }
+            continue;
+        }
         if st.selection.shapes.len() == 1 || !editing_this {
             let (hs, rot) = box_handles(&x);
             let rot_s = xf.to_screen(rot);
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..3106f473 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1891,6 +1891,11 @@ fn shape_format(app: &mut SlideApp, ui: &mut Ui) {
             if let Some(p) = shapes_gallery(ui) {
                 run(app, "shape.change", json!({"preset": p}));
             }
+            ui.separator();
+            if ui.add_enabled(enabled(app, "shape.editPoints"), egui::Button::new("Edit Points")).clicked() {
+                run(app, "shape.editPoints", json!({"on": true}));
+                ui.close();
+            }
         });
         let can_merge = enabled(app, "shape.merge");
         let r = big_button(ui, Icon::MergeShapes, "Merge\nShapes", can_merge).on_hover_text("Merge Shapes");
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..d0375b07 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -165,13 +165,13 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 - **Estimate:** 4–6 h.
 
 ### Edit points, text warp, 3-D
-- **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
+- **Evidence:** checklist rows "Edit points" (P1 partial: Edit Points converts a shape to a freeform, vertices drag, Ctrl/Cmd-click adds or deletes; no point types or Bézier control handles), "Text warp transforms" (partial: all 40
   `prstTxWarp` presets render and their adjusts round-trip, but there is no Transform gallery or
   command to apply one, no adjust handles, and arc/circle placement can differ from PowerPoint by
   1–3 % of the path length), "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting
   render as approximations and `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces,
   only the three-point rig, and no command or pane to apply 3-D).
-- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
+- **Estimate:** 2–3 h (edit points: point types, control handles), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
   rigs and materials, Format Shape page).
 
 ### Proofing: spelling, thesaurus, AutoCorrect
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Edit Points: convert to freeform, drag, add and delete vertices (`shape.editPoints`, `shape.movePoint`, `shape.addPoint`, `shape.deletePoint`); left: point types and control handles |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..4c5f1793 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -110,7 +110,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Shapes | Connectors (straight, elbow, curved) | P0 | D |
 | Shapes | Connector glue to connection sites | P1 | D |
 | Shapes | Freeform, curve and scribble tools | P1 | D |
-| Shapes | Edit points | P1 | M |
+| Shapes | Edit points | P1 | P |
 | Shapes | Merge shapes (union, combine, fragment, intersect, subtract) | P1 | D |
 | Shapes | Change shape | P1 | D |
 | Shapes | Text boxes | P0 | D |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..a19b6c10 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -78,7 +78,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Nudge (arrows), fine nudge (Option+arrows) | yes | yes |
 | Shift-constrained move, Option-drag to duplicate | yes | yes |
 | Connector glue and rerouting | yes | yes |
-| Edit points on freeforms | yes | **no** |
+| Edit points on freeforms | yes | partial: Edit Shape ▸ Edit Points turns any shape into a freeform; drag vertices, Ctrl/Cmd-click to add or delete; no smooth/straight/corner point types or Bézier handles yet |
 | Crop handles, crop to shape, aspect ratio | yes | partial |
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
 | Exact size/position, lock aspect | yes | yes |

From 4ea79d4c5e3df4b9417d4888ad9d7d88ba57835d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:29:57 +0300
Subject: [PATCH 155/376] =?UTF-8?q?Shapes:=20Edit=20Points=20=E2=80=94=20p?=
 =?UTF-8?q?oint=20types,=20B=C3=A9zier=20handles,=20right-click=20menu?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

shape.pointType makes a vertex smooth (handles in line and equal),
straight (in line) or corner (independent), turning its segments into
curves so it has handles. shape.moveHandle drags a control handle; the
other one follows as the point's type says (given, or read from the
handles). shape.points also reports each vertex's type.

Canvas: clicking a vertex shows its handles, which drag (one undo step
per drag) and follow the type chosen for it. Right-click a vertex for
Smooth / Straight / Corner Point and Delete Point, or anywhere for Exit
Edit Points; a shape's context menu gets Edit Points. The selection box
is hidden while points are edited.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/points.rs | 231 +++++++++++++++++++++++++++++++-
 crates/engine/src/keys.rs       |   1 +
 crates/engine/src/tests.rs      |  66 +++++++++
 crates/engine/src/tools.rs      |  53 +++++++-
 crates/ui-egui/src/canvas.rs    |  79 +++++++++--
 docs/gaps.md                    |   5 +-
 docs/ui-parity.md               |   2 +-
 7 files changed, 415 insertions(+), 22 deletions(-)

diff --git a/crates/engine/src/cmd/points.rs b/crates/engine/src/cmd/points.rs
index 164bb58f..e8385d39 100644
--- a/crates/engine/src/cmd/points.rs
+++ b/crates/engine/src/cmd/points.rs
@@ -24,7 +24,7 @@ pub fn specs() -> Vec<CommandSpec> {
             has_selection,
             edit_points
         ),
-        cmd!(query "shape.points", "Points", [], None, "{id?} → {id, paths: [[[x, y] slide pt]]} vertices of a freeform", has_selection, points),
+        cmd!(query "shape.points", "Points", [], None, "{id?} → {id, paths: [[[x, y] slide pt]], types: [[smooth|straight|corner]]} vertices of a freeform", has_selection, points),
         cmd!("shape.movePoint", "Move Point", [], None, "{path?: 0, index, x, y: slide pt, id?}", has_selection, move_point),
         cmd!(
             "shape.addPoint",
@@ -35,6 +35,24 @@ pub fn specs() -> Vec<CommandSpec> {
             has_selection,
             add_point
         ),
+        cmd!(
+            "shape.pointType",
+            "Point Type",
+            [],
+            None,
+            "{path?: 0, index, type: smooth|straight|corner, id?} — smooth: handles in line and equal; straight: in line; corner: independent",
+            has_selection,
+            point_type
+        ),
+        cmd!(
+            "shape.moveHandle",
+            "Move Handle",
+            [],
+            None,
+            "{path?: 0, index, side: in|out, x, y: slide pt, type?: smooth|straight|corner (default: read from the handles), id?}",
+            has_selection,
+            move_handle
+        ),
         cmd!("shape.deletePoint", "Delete Point", [], None, "{path?: 0, index, id?}", has_selection, delete_point),
     ]
 }
@@ -383,6 +401,7 @@ pub(crate) fn prepare(s: &mut Session, id: ShapeId) -> Result<()> {
 
 fn edit_points(s: &mut Session, p: &Value) -> Result<Value> {
     let on = p.get("on").and_then(Value::as_bool).unwrap_or(s.tool.edit_points.is_none());
+    s.tool.edit_vertex = None;
     if !on {
         s.tool.edit_points = None;
         return Ok(json!({"editing": Value::Null}));
@@ -417,7 +436,17 @@ fn points(s: &mut Session, p: &Value) -> Result<Value> {
     let sh = st.shape(id).ok_or_else(|| bad("shape.points", "no such shape"))?;
     let paths: Vec<Vec<[f64; 2]>> =
         slide_vertices(&st.doc, &st.selection, sh).into_iter().map(|v| v.into_iter().map(|q| [q.x, q.y]).collect()).collect();
-    Ok(json!({"id": id.0, "paths": paths}))
+    let types: Vec<Vec<&str>> = match &sh.geom {
+        Geom::Custom { paths } => paths
+            .iter()
+            .map(|cp| {
+                let segs = parse(&cp.d);
+                vertices(&segs).iter().map(|si| point_kind(&segs, *si)).collect()
+            })
+            .collect(),
+        Geom::Preset { .. } => vec![],
+    };
+    Ok(json!({"id": id.0, "paths": paths, "types": types}))
 }
 
 /// Runs `f` on the segments of path `path` of `id` (in shape-local points), then refits the box.
@@ -557,3 +586,201 @@ pub fn segment_at(doc: &deckcraft_model::Presentation, sel: &crate::Selection, s
 pub(crate) fn move_point_raw(s: &mut Session, id: ShapeId, path: usize, index: usize, to: Point) -> Result<Value> {
     move_point(s, &json!({"id": id.0, "path": path, "index": index, "x": to.x, "y": to.y}))
 }
+
+/// Where the control handles of the vertex ending segment `si` live: (segment, point index) for
+/// the incoming and the outgoing one, when those segments are cubics.
+fn handle_slots(segs: &[Seg], si: usize) -> (Option<(usize, usize)>, Option<(usize, usize)>) {
+    let incoming = if matches!(segs.get(si), Some(Seg::M(_))) {
+        (si + 1..segs.len()).take_while(|j| !matches!(segs.get(*j), Some(Seg::M(_)))).find(|j| closes_onto_start(segs, *j))
+    } else {
+        Some(si)
+    };
+    let inc = incoming.filter(|j| matches!(segs.get(*j), Some(Seg::C(..)))).map(|j| (j, 1));
+    let out = Some(si + 1).filter(|j| matches!(segs.get(*j), Some(Seg::C(..)))).map(|j| (j, 0));
+    (inc, out)
+}
+
+fn get_pt(segs: &[Seg], slot: (usize, usize)) -> Option<Point> {
+    match segs.get(slot.0)? {
+        Seg::C(a, b, c) => [*a, *b, *c].get(slot.1).copied(),
+        _ => None,
+    }
+}
+
+fn set_pt(segs: &mut [Seg], slot: (usize, usize), p: Point) {
+    if let Some(s) = segs.get_mut(slot.0)
+        && let Some(q) = s.points_mut().into_iter().nth(slot.1)
+    {
+        *q = p;
+    }
+}
+
+/// Turns segment `j` into a cubic with the same shape.
+fn to_cubic(segs: &mut [Seg], j: usize) {
+    let Some(p0) = seg_start(segs, j) else { return };
+    let c = match segs.get(j).copied() {
+        Some(Seg::L(p1)) => Seg::C(p0.lerp(p1, 1.0 / 3.0), p0.lerp(p1, 2.0 / 3.0), p1),
+        Some(Seg::Q(c, p1)) => Seg::C(p0.lerp(c, 2.0 / 3.0), p1.lerp(c, 2.0 / 3.0), p1),
+        _ => return,
+    };
+    if let Some(s) = segs.get_mut(j) {
+        *s = c;
+    }
+}
+
+/// Sets the point type of the vertex ending segment `si`. Its segments become curves so it has
+/// handles; smooth and straight points get their handles in line through the vertex.
+fn set_type(segs: &mut [Seg], si: usize, kind: &str) {
+    let incoming = if matches!(segs.get(si), Some(Seg::M(_))) {
+        (si + 1..segs.len()).take_while(|j| !matches!(segs.get(*j), Some(Seg::M(_)))).find(|j| closes_onto_start(segs, *j))
+    } else {
+        Some(si)
+    };
+    if let Some(j) = incoming {
+        to_cubic(segs, j);
+    }
+    to_cubic(segs, si + 1);
+    if kind == "corner" {
+        return;
+    }
+    let (Some(v), (Some(hi), Some(ho))) = (segs.get(si).and_then(Seg::end), handle_slots(segs, si)) else { return };
+    let (Some(a), Some(b)) = (get_pt(segs, hi), get_pt(segs, ho)) else { return };
+    let (li, lo) = ((a - v).hypot(), (b - v).hypot());
+    let mut dir = b - a;
+    if dir.hypot() < 1e-9 {
+        // Both handles on the vertex: point them along the neighbours.
+        let prev = seg_start(segs, hi.0).unwrap_or(v);
+        let next = segs.get(ho.0).and_then(Seg::end).unwrap_or(v);
+        dir = next - prev;
+    }
+    let len = dir.hypot();
+    if len < 1e-9 {
+        return;
+    }
+    let u = dir / len;
+    let (li, lo) = if kind == "smooth" {
+        let m = if li + lo > 1e-9 { (li + lo) / 2.0 } else { len / 6.0 };
+        (m, m)
+    } else {
+        (li, lo)
+    };
+    set_pt(segs, hi, v - u * li);
+    set_pt(segs, ho, v + u * lo);
+}
+
+/// The type a vertex's handles show: smooth (in line, equal), straight (in line) or corner.
+pub fn point_kind(segs: &[Seg], si: usize) -> &'static str {
+    let (Some(v), (Some(hi), Some(ho))) = (segs.get(si).and_then(Seg::end), handle_slots(segs, si)) else { return "corner" };
+    let (Some(a), Some(b)) = (get_pt(segs, hi), get_pt(segs, ho)) else { return "corner" };
+    let (da, db) = (a - v, b - v);
+    let (la, lb) = (da.hypot(), db.hypot());
+    if la < 1e-6 || lb < 1e-6 {
+        return "corner";
+    }
+    let cos = da.dot(db) / (la * lb);
+    if cos > -0.9998 {
+        "corner"
+    } else if (la - lb).abs() <= 0.01 * la.max(lb) {
+        "smooth"
+    } else {
+        "straight"
+    }
+}
+
+/// Moves handle `side` of the vertex ending segment `si` to `p`; the other handle follows as
+/// the point's type says.
+fn set_handle(segs: &mut [Seg], si: usize, out: bool, p: Point, kind: Option<&str>) -> bool {
+    let kind = kind.unwrap_or_else(|| point_kind(segs, si));
+    let (hi, ho) = handle_slots(segs, si);
+    let (mine, other) = if out { (ho, hi) } else { (hi, ho) };
+    let Some(mine) = mine else { return false };
+    let Some(v) = segs.get(si).and_then(Seg::end) else { return false };
+    set_pt(segs, mine, p);
+    if let Some(o) = other
+        && kind != "corner"
+        && let Some(q) = get_pt(segs, o)
+    {
+        let d = p - v;
+        let l = d.hypot();
+        if l > 1e-9 {
+            let lo = if kind == "smooth" { l } else { (q - v).hypot() };
+            set_pt(segs, o, v - d / l * lo);
+        }
+    }
+    true
+}
+
+/// Handles of vertex `index` of path `path` of `sh` in slide points: (incoming, outgoing, vertex).
+pub fn slide_handles(
+    doc: &deckcraft_model::Presentation,
+    sel: &crate::Selection,
+    sh: &Shape,
+    path: usize,
+    index: usize,
+) -> Option<(Option<Point>, Option<Point>, Point)> {
+    let Geom::Custom { paths } = &sh.geom else { return None };
+    let cp = paths.get(path)?;
+    let x = xfrm_of(doc, sel, sh);
+    let (sx, sy) = (if cp.w > 0.0 { x.w / cp.w } else { 1.0 }, if cp.h > 0.0 { x.h / cp.h } else { 1.0 });
+    let a = x.affine();
+    let to = |q: Point| a * Point::new(q.x * sx, q.y * sy);
+    let segs = parse(&cp.d);
+    let si = *vertices(&segs).get(index)?;
+    let v = segs.get(si).and_then(Seg::end)?;
+    let (hi, ho) = handle_slots(&segs, si);
+    Some((hi.and_then(|s| get_pt(&segs, s)).map(to), ho.and_then(|s| get_pt(&segs, s)).map(to), to(v)))
+}
+
+fn point_type(s: &mut Session, p: &Value) -> Result<Value> {
+    let id = target(s, p, "shape.pointType")?;
+    let path = p.get("path").and_then(Value::as_u64).unwrap_or(0) as usize;
+    let index = index_param(p, "index", "shape.pointType")?;
+    let kind = match str_param(p, "type") {
+        Some(k @ ("smooth" | "straight" | "corner")) => k.to_string(),
+        _ => return Err(bad("shape.pointType", "`type` is smooth, straight or corner")),
+    };
+    // A straight point's handles can be as long as each other; remember the choice for drags.
+    s.tool.vertex_kind = Some((path, index, kind.clone()));
+    edit_path(s, id, path, "shape.pointType", move |segs, vs, _| {
+        let si = *vs.get(index).ok_or_else(|| bad("shape.pointType", "no such point"))?;
+        set_type(segs, si, &kind);
+        Ok(true)
+    })
+}
+
+fn move_handle(s: &mut Session, p: &Value) -> Result<Value> {
+    let id = target(s, p, "shape.moveHandle")?;
+    let path = p.get("path").and_then(Value::as_u64).unwrap_or(0) as usize;
+    let index = index_param(p, "index", "shape.moveHandle")?;
+    let out = match str_param(p, "side") {
+        Some("out") => true,
+        Some("in") => false,
+        _ => return Err(bad("shape.moveHandle", "`side` is in or out")),
+    };
+    let to = match (f64_param(p, "x"), f64_param(p, "y")) {
+        (Some(x), Some(y)) if x.is_finite() && y.is_finite() => Point::new(x.clamp(-1e5, 1e5), y.clamp(-1e5, 1e5)),
+        _ => return Err(bad("shape.moveHandle", "give `x` and `y` in slide points")),
+    };
+    let kind = str_param(p, "type").filter(|k| matches!(*k, "smooth" | "straight" | "corner")).map(str::to_string);
+    edit_path(s, id, path, "shape.moveHandle", move |segs, vs, x| {
+        let si = *vs.get(index).ok_or_else(|| bad("shape.moveHandle", "no such point"))?;
+        if set_handle(segs, si, out, x.affine().inverse() * to, kind.as_deref()) {
+            Ok(true)
+        } else {
+            Err(bad("shape.moveHandle", "that side of the point has no handle"))
+        }
+    })
+}
+
+/// The type of vertex `index` of path `path` of `sh`.
+pub fn kind_of(sh: &Shape, path: usize, index: usize) -> Option<&'static str> {
+    let Geom::Custom { paths } = &sh.geom else { return None };
+    let segs = parse(&paths.get(path)?.d);
+    let si = *vertices(&segs).get(index)?;
+    Some(point_kind(&segs, si))
+}
+
+/// `shape.moveHandle` for pointer drags.
+pub(crate) fn move_handle_raw(s: &mut Session, p: &Value) -> Result<Value> {
+    move_handle(s, p)
+}
diff --git a/crates/engine/src/keys.rs b/crates/engine/src/keys.rs
index 49e75057..bc71b575 100644
--- a/crates/engine/src/keys.rs
+++ b/crates/engine/src/keys.rs
@@ -59,6 +59,7 @@ impl Session {
         }
         if self.tool.edit_points.is_some() && matches!(k, "enter" | "return" | "escape") {
             self.tool.edit_points = None;
+            self.tool.edit_vertex = None;
             return Ok(json!({"handled": true, "command": "shape.editPoints"}));
         }
         if editing && let Some((id, params)) = self.text_key(k, mods) {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index de931942..28987aa9 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -934,3 +934,69 @@ fn edit_points_path_parse_and_write() {
     assert_eq!(write(&parse(&write(&segs))), write(&segs));
     assert!(parse("C 1 2 3").is_empty());
 }
+
+#[test]
+fn edit_points_types_and_handles() {
+    use crate::tools::{Mods, PointerEvent, PointerKind};
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100]})).unwrap();
+    s.execute("shape.editPoints", &json!({"on": true})).unwrap();
+    let q = |s: &mut Session| s.execute("shape.points", &json!({})).unwrap();
+    assert_eq!(q(&mut s)["types"][0][1], "corner");
+    // A rectangle's corner has no handles until it is a smooth point.
+    let id = deckcraft_model::ShapeId(q(&mut s)["id"].as_u64().unwrap() as u32);
+    let handles = |s: &Session| {
+        let st = s.doc().unwrap();
+        crate::cmd::points::slide_handles(&st.doc, &st.selection, st.shape(id).unwrap(), 0, 1).unwrap()
+    };
+    assert_eq!((handles(&s).0, handles(&s).1), (None, None));
+    assert!(s.execute("shape.moveHandle", &json!({"index": 1, "side": "out", "x": 0, "y": 0})).is_err());
+    s.execute("shape.pointType", &json!({"index": 1, "type": "smooth"})).unwrap();
+    assert_eq!(q(&mut s)["types"][0][1], "smooth");
+    let (hi, ho, v) = handles(&s);
+    let (hi, ho) = (hi.unwrap(), ho.unwrap());
+    assert!(((hi - v).hypot() - (ho - v).hypot()).abs() < 1e-6);
+    assert!(((hi - v).normalize() + (ho - v).normalize()).hypot() < 1e-6);
+    // Dragging one handle of a smooth point mirrors the other.
+    let to = v + deckcraft_geom::Vec2::new(40.0, 10.0);
+    s.execute("shape.moveHandle", &json!({"index": 1, "side": "out", "x": to.x, "y": to.y})).unwrap();
+    let (hi, ho, v) = handles(&s);
+    assert!((ho.unwrap() - to).hypot() < 1e-6 || q(&mut s)["types"][0][1] == "smooth");
+    assert!(((hi.unwrap() - v) + (ho.unwrap() - v)).hypot() < 1e-6);
+    // Straight: in line, lengths kept; corner: independent.
+    s.execute("shape.pointType", &json!({"index": 1, "type": "straight"})).unwrap();
+    let (_, ho, v) = handles(&s);
+    let far = v + (ho.unwrap() - v) * 3.0;
+    s.execute("shape.moveHandle", &json!({"index": 1, "side": "out", "x": far.x, "y": far.y, "type": "straight"})).unwrap();
+    assert_eq!(q(&mut s)["types"][0][1], "straight");
+    s.execute("shape.pointType", &json!({"index": 1, "type": "corner"})).unwrap();
+    let (hi0, ho, v) = handles(&s);
+    let off = v + deckcraft_geom::Vec2::new(0.0, -30.0);
+    let _ = ho;
+    // (The pointer passes the type last chosen for the vertex, as here.)
+    s.execute("shape.moveHandle", &json!({"index": 1, "side": "out", "x": off.x, "y": off.y, "type": "corner"})).unwrap();
+    let (hi1, _, v1) = handles(&s);
+    assert!(((hi1.unwrap() - v1) - (hi0.unwrap() - v)).hypot() < 1e-6);
+    assert_eq!(q(&mut s)["types"][0][1], "corner");
+    assert!(s.execute("shape.pointType", &json!({"index": 1, "type": "wobbly"})).is_err());
+    // With the pointer: click a vertex to show its handles, drag one (one undo step).
+    s.execute("shape.pointType", &json!({"index": 2, "type": "smooth"})).unwrap();
+    let st = s.doc().unwrap();
+    let (_, ho, v) = crate::cmd::points::slide_handles(&st.doc, &st.selection, st.shape(id).unwrap(), 0, 2).unwrap();
+    let ho = ho.unwrap();
+    let ev = |kind, x: f64, y: f64| PointerEvent { kind, x, y, mods: Mods::default(), ..Default::default() };
+    s.pointer(ev(PointerKind::Down, v.x, v.y)).unwrap();
+    s.pointer(ev(PointerKind::Up, v.x, v.y)).unwrap();
+    assert_eq!(s.tool.edit_vertex, Some((0, 2)));
+    s.pointer(ev(PointerKind::Down, ho.x, ho.y)).unwrap();
+    s.pointer(ev(PointerKind::Drag, ho.x + 20.0, ho.y + 20.0)).unwrap();
+    s.pointer(ev(PointerKind::Up, ho.x + 20.0, ho.y + 20.0)).unwrap();
+    let st = s.doc().unwrap();
+    let (_, ho2, _) = crate::cmd::points::slide_handles(&st.doc, &st.selection, st.shape(id).unwrap(), 0, 2).unwrap();
+    assert!((ho2.unwrap() - (ho + deckcraft_geom::Vec2::new(20.0, 20.0))).hypot() < 1e-3, "{ho2:?}");
+    s.execute("edit.undo", &json!({})).unwrap();
+    let st = s.doc().unwrap();
+    let (_, ho3, _) = crate::cmd::points::slide_handles(&st.doc, &st.selection, st.shape(id).unwrap(), 0, 2).unwrap();
+    assert!((ho3.unwrap() - ho).hypot() < 1e-3);
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index 892fe512..7e0c41a0 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -76,6 +76,13 @@ pub enum Hit {
         id: ShapeId,
         index: usize,
     },
+    /// A control handle (`out`: the outgoing one) of the selected vertex in Edit Points.
+    Handle {
+        id: ShapeId,
+        path: usize,
+        index: usize,
+        out: bool,
+    },
     /// A vertex of a shape whose points are being edited.
     Vertex {
         id: ShapeId,
@@ -130,6 +137,12 @@ enum Drag {
         path: usize,
         index: usize,
     },
+    Handle {
+        id: ShapeId,
+        path: usize,
+        index: usize,
+        out: bool,
+    },
     Marquee {
         start: Point,
         add: bool,
@@ -191,6 +204,10 @@ pub struct ToolState {
     pub path_closing: bool,
     /// The shape in Edit Points: its vertices are handles instead of the box's.
     pub edit_points: Option<ShapeId>,
+    /// The vertex (path, index) whose control handles show in Edit Points.
+    pub edit_vertex: Option<(usize, usize)>,
+    /// The point type last chosen for a vertex (path, index, type): handle drags follow it.
+    pub vertex_kind: Option<(usize, usize, String)>,
 }
 
 impl ToolState {
@@ -236,9 +253,19 @@ impl Session {
         // In Edit Points, the edited shape's vertices come first.
         if let Some(id) = self.tool.editing_points(st)
             && let Some(sh) = st.shape(id)
-            && let Some((path, index)) = cmd::points::vertex_at(&st.doc, &st.selection, sh, p, tol * 1.6)
         {
-            return Some(Hit::Vertex { id, path, index });
+            if let Some((path, index)) = self.tool.edit_vertex
+                && let Some((hin, hout, _)) = cmd::points::slide_handles(&st.doc, &st.selection, sh, path, index)
+            {
+                for (h, out) in [(hout, true), (hin, false)] {
+                    if h.is_some_and(|q| (q - p).hypot() <= tol * 1.6) {
+                        return Some(Hit::Handle { id, path, index, out });
+                    }
+                }
+            }
+            if let Some((path, index)) = cmd::points::vertex_at(&st.doc, &st.selection, sh, p, tol * 1.6) {
+                return Some(Hit::Vertex { id, path, index });
+            }
         }
         // Handles of selected shapes first.
         if st.selection.text.is_none() || st.selection.shapes.len() == 1 {
@@ -419,10 +446,16 @@ impl Session {
                 if mods.cmd {
                     return self.execute("shape.deletePoint", &json!({"id": id, "path": path, "index": index}));
                 }
+                self.tool.edit_vertex = Some((path, index));
                 self.begin("Edit Points");
                 self.tool.drag = Some(Drag::Vertex { id, path, index });
                 return Ok(json!({"vertex": [path, index]}));
             }
+            if let Some(Hit::Handle { id, path, index, out }) = hit {
+                self.begin("Edit Points");
+                self.tool.drag = Some(Drag::Handle { id, path, index, out });
+                return Ok(json!({"handle": [path, index]}));
+            }
             let st = self.doc()?;
             if let Some(sh) = st.shape(eid)
                 && let Some((path, seg, t)) = cmd::points::segment_at(&st.doc, &st.selection, sh, p, tol * 1.6)
@@ -433,6 +466,7 @@ impl Session {
                 return Ok(Value::Null);
             }
             self.tool.edit_points = None;
+            self.tool.edit_vertex = None;
         }
         let st = self.doc()?;
         match hit {
@@ -455,7 +489,7 @@ impl Session {
                 self.tool.drag = Some(Drag::Rotate { ids, center, start, origs });
             }
             // Only reached outside Edit Points (handled above).
-            Some(Hit::Vertex { .. }) => {}
+            Some(Hit::Vertex { .. } | Hit::Handle { .. }) => {}
             Some(Hit::Adjust { id, index }) => {
                 let orig = st.shape(id).map(|s| xfrm_of(&st.doc, &st.selection, s)).unwrap_or_default();
                 self.begin("Adjust Shape");
@@ -655,6 +689,14 @@ impl Session {
                 self.edit_vertex(id, path, index, p)?;
                 return Ok(Value::Null);
             }
+            Drag::Handle { id, path, index, out } => {
+                self.tool.drag = Some(Drag::Handle { id, path, index, out });
+                let side = if out { "out" } else { "in" };
+                if let Err(e) = self.execute_inner_move_handle(id, path, index, side, p) {
+                    log::debug!("edit handle: {e}");
+                }
+                return Ok(Value::Null);
+            }
             Drag::Marquee { start, .. } => {
                 self.tool.marquee = Some(Rect::from_points(start, p));
             }
@@ -724,6 +766,11 @@ impl Session {
         Ok(())
     }
 
+    fn execute_inner_move_handle(&mut self, id: ShapeId, path: usize, index: usize, side: &str, p: Point) -> Result<Value> {
+        let kind = self.tool.vertex_kind.clone().filter(|(pp, i, _)| (*pp, *i) == (path, index)).map(|k| k.2);
+        cmd::points::move_handle_raw(self, &json!({"id": id.0, "path": path, "index": index, "side": side, "x": p.x, "y": p.y, "type": kind}))
+    }
+
     fn up(&mut self, p: Point, mods: Mods) -> Result<Value> {
         let drag = self.tool.drag.take();
         self.tool.guides.clear();
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 4dc7b109..eb4bb4a8 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -452,6 +452,35 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
             continue;
         }
         let editing_this = editing.as_ref().is_some_and(|e| e.shape == *id && !e.notes);
+        if app.session.tool.editing_points(st) == Some(sh.id) {
+            // Edit Points: the outline's vertices are the handles.
+            // No selection box: the outline and its vertices are what's edited.
+            if let Some((path, index)) = app.session.tool.edit_vertex
+                && let Some((hin, hout, v)) = deckcraft_engine::cmd::points::slide_handles(&st.doc, &st.selection, sh, path, index)
+            {
+                for h in [hin, hout].into_iter().flatten() {
+                    painter.line_segment([xf.to_screen(v), xf.to_screen(h)], sel_stroke);
+                    painter.rect(
+                        egui::Rect::from_center_size(xf.to_screen(h), egui::vec2(6.0, 6.0)),
+                        0.0,
+                        Color32::WHITE,
+                        Stroke::new(1.0, t.selection),
+                        egui::StrokeKind::Middle,
+                    );
+                }
+            }
+            for q in deckcraft_engine::cmd::points::slide_vertices(&st.doc, &st.selection, sh).into_iter().flatten() {
+                let c = xf.to_screen(q);
+                painter.rect(
+                    egui::Rect::from_center_size(c, egui::vec2(7.0, 7.0)),
+                    0.0,
+                    Color32::BLACK,
+                    Stroke::new(1.0, Color32::WHITE),
+                    egui::StrokeKind::Middle,
+                );
+            }
+            continue;
+        }
         if editing_this {
             // Dashed box while editing text.
             for i in 0..4 {
@@ -468,20 +497,6 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
             }
             continue;
         }
-        if app.session.tool.editing_points(st) == Some(sh.id) {
-            // Edit Points: the outline's vertices are the handles.
-            for q in deckcraft_engine::cmd::points::slide_vertices(&st.doc, &st.selection, sh).into_iter().flatten() {
-                let c = xf.to_screen(q);
-                painter.rect(
-                    egui::Rect::from_center_size(c, egui::vec2(7.0, 7.0)),
-                    0.0,
-                    Color32::BLACK,
-                    Stroke::new(1.0, Color32::WHITE),
-                    egui::StrokeKind::Middle,
-                );
-            }
-            continue;
-        }
         if st.selection.shapes.len() == 1 || !editing_this {
             let (hs, rot) = box_handles(&x);
             let rot_s = xf.to_screen(rot);
@@ -635,7 +650,36 @@ fn draw_preview(app: &SlideApp, p: &egui::Painter, xf: Xf, x: Xfrm, t: &Tokens)
 }
 
 fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
+    // Right-clicking a vertex in Edit Points picks it for the point menu.
+    if resp.secondary_clicked()
+        && let Some(Hit::Vertex { path, index, .. }) = app.session.tool.hover.clone()
+    {
+        app.session.tool.edit_vertex = Some((path, index));
+    }
     resp.context_menu(|ui| {
+        let editing = app.session.active().and_then(|d| app.session.tool.editing_points(d).and_then(|id| d.shape(id).cloned()));
+        if let Some(sh) = editing {
+            if let Some((path, index)) = app.session.tool.edit_vertex {
+                let cur = deckcraft_engine::cmd::points::kind_of(&sh, path, index);
+                for (l, k) in [("Smooth Point", "smooth"), ("Straight Point", "straight"), ("Corner Point", "corner")] {
+                    if ui.radio(cur == Some(k), l).clicked() {
+                        let _ = app.run("shape.pointType", json!({"path": path, "index": index, "type": k}));
+                        ui.close();
+                    }
+                }
+                if ui.button("Delete Point").clicked() {
+                    let _ = app.run("shape.deletePoint", json!({"path": path, "index": index}));
+                    app.session.tool.edit_vertex = None;
+                    ui.close();
+                }
+                ui.separator();
+            }
+            if ui.button("Exit Edit Points").clicked() {
+                let _ = app.run("shape.editPoints", json!({"on": false}));
+                ui.close();
+            }
+            return;
+        }
         let has_sel = app.session.active().is_some_and(|d| !d.selection.shapes.is_empty());
         for (l, id) in [("Cut", "edit.cut"), ("Copy", "edit.copy"), ("Paste", "edit.paste")] {
             if ui.add_enabled(crate::ribbon::enabled(app, id), egui::Button::new(l)).clicked() {
@@ -649,6 +693,13 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
                 let _ = app.run("text.edit", json!({}));
                 ui.close();
             }
+            if crate::ribbon::enabled(app, "shape.editPoints")
+                && app.session.active().is_some_and(|d| d.selection.shapes.len() == 1 && d.selected_shapes().iter().all(|s| !s.is_line()))
+                && ui.button("Edit Points").clicked()
+            {
+                let _ = app.run("shape.editPoints", json!({"on": true}));
+                ui.close();
+            }
             ui.menu_button("Bring to Front", |ui| {
                 crate::ribbon::menu_item(app, ui, crate::icons::Icon::BringToFront, "Bring to Front", "arrange.bringToFront", json!({}));
                 crate::ribbon::menu_item(app, ui, crate::icons::Icon::BringForward, "Bring Forward", "arrange.bringForward", json!({}));
diff --git a/docs/gaps.md b/docs/gaps.md
index d0375b07..cfe559ea 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -165,13 +165,13 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 - **Estimate:** 4–6 h.
 
 ### Edit points, text warp, 3-D
-- **Evidence:** checklist rows "Edit points" (P1 partial: Edit Points converts a shape to a freeform, vertices drag, Ctrl/Cmd-click adds or deletes; no point types or Bézier control handles), "Text warp transforms" (partial: all 40
+- **Evidence:** checklist rows "Edit points" (P1 partial: Edit Points converts a shape to a freeform, vertices drag, Ctrl/Cmd-click adds or deletes, smooth/straight/corner points and Bézier handles; no Straight/Curved Segment or Open/Close Path), "Text warp transforms" (partial: all 40
   `prstTxWarp` presets render and their adjusts round-trip, but there is no Transform gallery or
   command to apply one, no adjust handles, and arc/circle placement can differ from PowerPoint by
   1–3 % of the path length), "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting
   render as approximations and `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces,
   only the three-point rig, and no command or pane to apply 3-D).
-- **Estimate:** 2–3 h (edit points: point types, control handles), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
+- **Estimate:** 1 h (edit points: segment types, open/close path), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
   rigs and materials, Format Shape page).
 
 ### Proofing: spelling, thesaurus, AutoCorrect
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Edit Points: smooth/straight/corner point types, Bézier handle dragging, right-click point menu, no selection box while editing |
 | 2026-10-13 | minor | Edit Points: convert to freeform, drag, add and delete vertices (`shape.editPoints`, `shape.movePoint`, `shape.addPoint`, `shape.deletePoint`); left: point types and control handles |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index a19b6c10..63873b7f 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -78,7 +78,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Nudge (arrows), fine nudge (Option+arrows) | yes | yes |
 | Shift-constrained move, Option-drag to duplicate | yes | yes |
 | Connector glue and rerouting | yes | yes |
-| Edit points on freeforms | yes | partial: Edit Shape ▸ Edit Points turns any shape into a freeform; drag vertices, Ctrl/Cmd-click to add or delete; no smooth/straight/corner point types or Bézier handles yet |
+| Edit points on freeforms | yes | partial: Edit Shape ▸ Edit Points turns any shape into a freeform; drag vertices and their Bézier handles, Ctrl/Cmd-click to add or delete, right-click for Smooth/Straight/Corner Point and Delete Point; no Straight/Curved Segment or Open/Close Path yet |
 | Crop handles, crop to shape, aspect ratio | yes | partial |
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
 | Exact size/position, lock aspect | yes | yes |

From 69a4424e75a636df392cfcb1309b8210467e2b8a Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:30:19 +0300
Subject: [PATCH 156/376] Transitions: built-in sounds, Stop Previous Sound and
 Loop Until Next

Follow-up to the transition sound picker. The Sound box now lists
[Stop Previous Sound] and six built-in sounds (Chime, Click, Camera,
Whoosh, Drum Roll, Laser) that are synthesised as small WAVs when
chosen, so no sound files ship with the app; the same built-in sound is
embedded once however many slides use it. Loop Until Next Sound repeats
a sound in the show until another slide's sound or Stop Previous Sound.
PPTX reads and writes p:stSnd loop="1" and p:endSnd, keeps the sound's
file name in p:snd/@name, and setting a slide's transition to None no
longer drops its sound.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/transition.rs |  70 ++++++++++++++----
 crates/engine/src/lib.rs            |   1 +
 crates/engine/src/sounds.rs         | 107 ++++++++++++++++++++++++++++
 crates/model/src/anim.rs            |   8 +++
 crates/pptx/src/read/timing.rs      |   4 +-
 crates/pptx/src/write/timing.rs     |  13 ++--
 crates/pptx/tests/roundtrip.rs      |  35 +++++++++
 crates/ui-egui/src/ribbon.rs        |  27 +++++--
 crates/ui-egui/src/show.rs          |  11 ++-
 docs/animation-parity.md            |   4 +-
 docs/parity-checklist.md            |   2 +-
 11 files changed, 254 insertions(+), 28 deletions(-)
 create mode 100644 crates/engine/src/sounds.rs

diff --git a/crates/engine/src/cmd/transition.rs b/crates/engine/src/cmd/transition.rs
index 28db7607..4c798125 100644
--- a/crates/engine/src/cmd/transition.rs
+++ b/crates/engine/src/cmd/transition.rs
@@ -35,7 +35,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Sound",
             ["Transitions", "Timing"],
             None,
-            "{path? | data: base64, name?; none?: true (No Sound); index?} — the sound plays as the slide comes in",
+            "{builtin?: chime|click|camera|whoosh|drumRoll|laser | path? | data: base64, name?; none?: true (No Sound); stopPrevious?: true; loop?: bool (Loop Until Next Sound); index?} — the sound plays as the slide comes in",
             has_slide,
             sound
         ),
@@ -69,7 +69,11 @@ fn set(s: &mut Session, p: &Value) -> Result<Value> {
                 t.option = option.clone();
                 t.duration_ms = duration.unwrap_or(info.3);
                 t.raw = None;
-                sl.transition = if info.0 == "none" && t.advance_after_ms.is_none() && t.advance_on_click { None } else { Some(t) };
+                sl.transition = if info.0 == "none" && t.advance_after_ms.is_none() && t.advance_on_click && t.sound.is_none() && !t.stop_sound {
+                    None
+                } else {
+                    Some(t)
+                };
             }
         }
         Ok(())
@@ -120,20 +124,51 @@ fn timing(s: &mut Session, p: &Value) -> Result<Value> {
 /// Transitions › Sound: embed an audio file as the slides' transition sound, or `none` to remove it.
 fn sound(s: &mut Session, p: &Value) -> Result<Value> {
     let list = slide_indices(s, p)?;
-    if bool_param(p, "none") == Some(true) {
+    let looping = bool_param(p, "loop");
+    let edit_all = |s: &mut Session, f: &dyn Fn(&mut Transition)| {
         s.edit(|doc, _| {
-            for i in list {
-                if let Some(sl) = doc.slides.get_mut(i)
-                    && let Some(t) = Arc::make_mut(sl).transition.as_mut()
-                {
-                    t.sound = None;
+            for &i in &list {
+                if let Some(sl) = doc.slides.get_mut(i) {
+                    f(Arc::make_mut(sl).transition.get_or_insert_with(Transition::default));
                 }
             }
             Ok(())
+        })
+    };
+    if bool_param(p, "none") == Some(true) {
+        edit_all(s, &|t| {
+            t.sound = None;
+            t.stop_sound = false;
+            t.sound_loop = false;
         })?;
         return Ok(json!({"sound": null}));
     }
-    let (name, bytes) = super::insert::media_bytes(p, "transition.sound")?;
+    if bool_param(p, "stopPrevious") == Some(true) {
+        edit_all(s, &|t| {
+            t.sound = None;
+            t.sound_loop = false;
+            t.stop_sound = true;
+        })?;
+        return Ok(json!({"sound": null, "stopPrevious": true}));
+    }
+    let wants_file = p.get("path").is_some() || p.get("data").is_some() || p.get("builtin").is_some();
+    if !wants_file {
+        // Only Loop Until Next Sound changes.
+        let Some(l) = looping else { return Err(bad("transition.sound", "give `path`, `data`, `builtin`, `none`, `stopPrevious` or `loop`")) };
+        edit_all(s, &|t| t.sound_loop = l && t.sound.is_some())?;
+        return Ok(json!({"loop": l}));
+    }
+    let (name, bytes) = match str_param(p, "builtin") {
+        Some(id) => {
+            let (id, label) = crate::sounds::BUILTIN.iter().find(|b| b.0.eq_ignore_ascii_case(id)).ok_or_else(|| {
+                let ids: Vec<&str> = crate::sounds::BUILTIN.iter().map(|b| b.0).collect();
+                bad("transition.sound", format!("unknown built-in sound `{id}` (one of {})", ids.join(", ")))
+            })?;
+            let bytes = crate::sounds::builtin(id).ok_or_else(|| bad("transition.sound", "built-in sound failed"))?;
+            (format!("{label}.wav"), bytes)
+        }
+        None => super::insert::media_bytes(p, "transition.sound")?,
+    };
     let ct = super::insert::content_type(&name, &bytes);
     let bytes = Arc::new(bytes);
     let audible = deckcraft_media::probe(&bytes).is_ok_and(|i| i.audio.is_some());
@@ -141,16 +176,25 @@ fn sound(s: &mut Session, p: &Value) -> Result<Value> {
     if !audible && !ct.starts_with("audio/") {
         return Err(bad("transition.sound", format!("{name} is not a sound file ({ct})")));
     }
+    let lp = looping.unwrap_or(false);
     let media = s.edit(|doc, _| {
-        let media = doc.add_media(&name, ct, bytes);
-        for i in list {
+        // The same built-in sound is embedded once.
+        let existing = doc.media.iter().find(|m| m.name == name && m.data.as_slice() == bytes.as_slice()).map(|m| m.id);
+        let media = match existing {
+            Some(m) => m,
+            None => doc.add_media(&name, ct, bytes),
+        };
+        for &i in &list {
             if let Some(sl) = doc.slides.get_mut(i) {
-                Arc::make_mut(sl).transition.get_or_insert_with(Transition::default).sound = Some(media);
+                let t = Arc::make_mut(sl).transition.get_or_insert_with(Transition::default);
+                t.sound = Some(media);
+                t.stop_sound = false;
+                t.sound_loop = lp;
             }
         }
         Ok(media)
     })?;
-    Ok(json!({"sound": name, "media": media.0, "playable": audible}))
+    Ok(json!({"sound": name, "media": media.0, "playable": audible, "loop": lp}))
 }
 
 fn apply_all(s: &mut Session, _p: &Value) -> Result<Value> {
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..bda4d182 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -15,6 +15,7 @@ pub mod keys;
 pub mod links;
 pub mod recovery;
 pub mod sample;
+pub mod sounds;
 pub mod tools;
 
 use std::sync::Arc;
diff --git a/crates/engine/src/sounds.rs b/crates/engine/src/sounds.rs
new file mode 100644
index 00000000..8b97c758
--- /dev/null
+++ b/crates/engine/src/sounds.rs
@@ -0,0 +1,107 @@
+//! Built-in transition sounds, synthesised on demand so DeckCraft ships no sound files: short
+//! mono 16-bit WAVs named like PowerPoint's (Chime, Click, Camera, Whoosh, Drum Roll, Laser).
+
+use std::f64::consts::TAU;
+
+/// (id, label) of the built-in sounds, in menu order.
+pub const BUILTIN: [(&str, &str); 6] =
+    [("chime", "Chime"), ("click", "Click"), ("camera", "Camera"), ("whoosh", "Whoosh"), ("drumRoll", "Drum Roll"), ("laser", "Laser")];
+
+const RATE: u32 = 22_050;
+
+/// The WAV bytes of built-in sound `id`, or `None` for an unknown id.
+pub fn builtin(id: &str) -> Option<Vec<u8>> {
+    let mut noise = Lcg(0x9E37_79B9);
+    let samples: Vec<f64> = match id {
+        "chime" => tone(1.2, |t| {
+            let env = (-t * 3.0).exp() * attack(t, 0.005);
+            env * (0.6 * (TAU * 880.0 * t).sin() + 0.3 * (TAU * 1318.5 * t).sin() + 0.15 * (TAU * 1760.0 * t).sin())
+        }),
+        "click" => tone(0.03, |t| (-t * 300.0).exp() * noise.next()),
+        "camera" => tone(0.35, |t| {
+            let a = (-t * 250.0).exp();
+            let b = if t > 0.18 { (-(t - 0.18) * 180.0).exp() } else { 0.0 };
+            (a + 0.8 * b) * noise.next()
+        }),
+        "whoosh" => {
+            let mut lp = 0.0;
+            tone(0.7, |t| {
+                // Noise through a low-pass filter that opens and closes.
+                let k = 0.02 + 0.25 * (std::f64::consts::PI * t / 0.7).sin();
+                lp += k * (noise.next() - lp);
+                3.0 * lp * (std::f64::consts::PI * t / 0.7).sin()
+            })
+        }
+        "drumRoll" => tone(1.4, |t| {
+            let beat = (t * 24.0).fract() / 24.0;
+            let swell = 0.4 + 0.6 * (t / 1.4);
+            swell * (-beat * 90.0).exp() * (0.7 * noise.next() + 0.5 * (TAU * 110.0 * t).sin())
+        }),
+        "laser" => {
+            let mut phase = 0.0;
+            tone(0.5, |t| {
+                phase += TAU * (2400.0 * (-t * 5.0).exp() + 200.0) / RATE as f64;
+                (-t * 4.0).exp() * attack(t, 0.003) * phase.sin().signum() * 0.35
+            })
+        }
+        _ => return None,
+    };
+    Some(wav(&samples))
+}
+
+fn attack(t: f64, len: f64) -> f64 {
+    (t / len).min(1.0)
+}
+
+fn tone(secs: f64, mut f: impl FnMut(f64) -> f64) -> Vec<f64> {
+    let n = (secs * RATE as f64) as usize;
+    (0..n).map(|i| f(i as f64 / RATE as f64)).collect()
+}
+
+/// A small deterministic noise source (-1..1).
+struct Lcg(u32);
+impl Lcg {
+    fn next(&mut self) -> f64 {
+        self.0 = self.0.wrapping_mul(1_664_525).wrapping_add(1_013_904_223);
+        (self.0 >> 8) as f64 / (1u32 << 23) as f64 - 1.0
+    }
+}
+
+fn wav(samples: &[f64]) -> Vec<u8> {
+    let data_len = (samples.len() * 2) as u32;
+    let mut v = Vec::with_capacity(44 + data_len as usize);
+    v.extend_from_slice(b"RIFF");
+    v.extend_from_slice(&(36 + data_len).to_le_bytes());
+    v.extend_from_slice(b"WAVEfmt ");
+    v.extend_from_slice(&16u32.to_le_bytes());
+    v.extend_from_slice(&1u16.to_le_bytes()); // PCM
+    v.extend_from_slice(&1u16.to_le_bytes()); // mono
+    v.extend_from_slice(&RATE.to_le_bytes());
+    v.extend_from_slice(&(RATE * 2).to_le_bytes());
+    v.extend_from_slice(&2u16.to_le_bytes());
+    v.extend_from_slice(&16u16.to_le_bytes());
+    v.extend_from_slice(b"data");
+    v.extend_from_slice(&data_len.to_le_bytes());
+    for s in samples {
+        let x = (s.clamp(-1.0, 1.0) * 0.8 * i16::MAX as f64) as i16;
+        v.extend_from_slice(&x.to_le_bytes());
+    }
+    v
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn every_builtin_sound_is_a_playable_wav() {
+        for (id, _) in BUILTIN {
+            let bytes = builtin(id).unwrap_or_default();
+            assert!(bytes.len() > 44, "{id}");
+            let info = deckcraft_media::probe(&std::sync::Arc::new(bytes)).expect(id);
+            assert!(info.audio.is_some() && info.playable(), "{id}");
+            assert!(info.duration() > 0.01 && info.duration() < 2.0, "{id}: {}", info.duration());
+        }
+        assert!(builtin("nope").is_none());
+    }
+}
diff --git a/crates/model/src/anim.rs b/crates/model/src/anim.rs
index 7c45aa0f..ff5bf6fa 100644
--- a/crates/model/src/anim.rs
+++ b/crates/model/src/anim.rs
@@ -21,6 +21,12 @@ pub struct Transition {
     pub advance_after_ms: Option<u32>,
     /// Embedded sound media.
     pub sound: Option<crate::MediaId>,
+    /// Loop Until Next Sound (`p:stSnd loop="1"`).
+    #[serde(skip_serializing_if = "std::ops::Not::not")]
+    pub sound_loop: bool,
+    /// [Stop Previous Sound] (`p:endSnd`): the slide stops a sound still playing.
+    #[serde(skip_serializing_if = "std::ops::Not::not")]
+    pub stop_sound: bool,
     /// Unmodelled transition XML kept for round-trip.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw: Option<String>,
@@ -35,6 +41,8 @@ impl Default for Transition {
             advance_on_click: true,
             advance_after_ms: None,
             sound: None,
+            sound_loop: false,
+            stop_sound: false,
             raw: None,
         }
     }
diff --git a/crates/pptx/src/read/timing.rs b/crates/pptx/src/read/timing.rs
index 500bb485..e50f79b6 100644
--- a/crates/pptx/src/read/timing.rs
+++ b/crates/pptx/src/read/timing.rs
@@ -41,8 +41,10 @@ pub fn transition(imp: &mut Imp, part: &Part, t: &El) -> Option<Transition> {
     });
     if let Some(snd) = t.path(&["sndAc", "stSnd", "snd"]) {
         tr.sound = dml::media_ref(imp, part, snd);
+        tr.sound_loop = t.path(&["sndAc", "stSnd"]).and_then(|s| s.attr("loop")).is_some_and(|v| v == "1" || v == "true");
     }
-    if tr.kind == "none" && tr.advance_on_click && tr.advance_after_ms.is_none() && tr.sound.is_none() {
+    tr.stop_sound = t.path(&["sndAc", "endSnd"]).is_some();
+    if tr.kind == "none" && tr.advance_on_click && tr.advance_after_ms.is_none() && tr.sound.is_none() && !tr.stop_sound {
         return None;
     }
     Some(tr)
diff --git a/crates/pptx/src/write/timing.rs b/crates/pptx/src/write/timing.rs
index aa577ca7..0832f492 100644
--- a/crates/pptx/src/write/timing.rs
+++ b/crates/pptx/src/write/timing.rs
@@ -16,14 +16,19 @@ pub fn transition(w: &mut W, x: &mut Exp, o: &mut Out, t: &Transition) {
         601..=900 => "med",
         _ => "slow",
     };
-    let sound = t.sound.and_then(|m| x.media_rel(o, m, "audio"));
+    let sound = t.sound.and_then(|m| x.media_rel(o, m, "audio").map(|r| (r, x.p.media(m).map(|i| i.name.clone()).unwrap_or_default())));
     let snd = |w: &mut W| {
-        if let Some(r) = &sound {
+        if let Some((r, name)) = &sound {
             w.open0("p:sndAc");
-            w.open0("p:stSnd");
-            w.empty("p:snd", A::new().a("r:embed", r).a("name", "sound.wav"));
+            w.open("p:stSnd", A::new().t("loop", t.sound_loop));
+            let name = if name.is_empty() { "sound.wav" } else { name.as_str() };
+            w.empty("p:snd", A::new().a("r:embed", r).a("name", name));
             w.close("p:stSnd");
             w.close("p:sndAc");
+        } else if t.stop_sound {
+            w.open0("p:sndAc");
+            w.empty0("p:endSnd");
+            w.close("p:sndAc");
         }
     };
     let mut effect = W::frag();
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index f9c8bc91..0542db18 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -1036,3 +1036,38 @@ fn transition_sound_is_set_saved_and_removed() {
     let not_audio = deckcraft_engine::cmd::base64_encode(b"hello, not a sound");
     assert!(s.execute("transition.sound", &json!({"data": not_audio, "name": "notes.txt"})).is_err());
 }
+
+/// Built-in transition sounds, Loop Until Next Sound and [Stop Previous Sound] are set, saved as
+/// PowerPoint writes them (`p:stSnd loop="1"`, `p:endSnd`) and read back.
+#[test]
+fn transition_sound_options_round_trip() {
+    use deckcraft_engine::Session;
+    use serde_json::json;
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({})).unwrap();
+    s.execute("slide.new", &json!({})).unwrap();
+    s.execute("transition.sound", &json!({"builtin": "chime", "loop": true, "index": 0})).unwrap();
+    s.execute("transition.sound", &json!({"builtin": "Chime", "index": 1})).unwrap();
+    s.execute("transition.sound", &json!({"stopPrevious": true, "index": 2})).unwrap();
+    let doc = s.doc().unwrap().doc.clone();
+    assert_eq!(doc.media.len(), 1, "the same built-in sound is embedded once");
+    assert_eq!(doc.media[0].name, "Chime.wav");
+    let bytes = deckcraft_pptx::export(&doc).unwrap();
+    let slide1 = {
+        let mut z = zip::ZipArchive::new(std::io::Cursor::new(&bytes)).unwrap();
+        let mut x = String::new();
+        std::io::Read::read_to_string(&mut z.by_name("ppt/slides/slide1.xml").unwrap(), &mut x).unwrap();
+        x
+    };
+    assert!(slide1.contains(r#"<p:stSnd loop="1">"#) && slide1.contains(r#"name="Chime.wav""#), "{slide1}");
+    let back = deckcraft_pptx::import(&bytes).unwrap();
+    let t: Vec<_> = back.slides.iter().map(|s| s.transition.clone().unwrap_or_default()).collect();
+    assert!(t[0].sound.is_some() && t[0].sound_loop && !t[0].stop_sound);
+    assert!(t[1].sound.is_some() && !t[1].sound_loop);
+    assert!(t[2].sound.is_none() && t[2].stop_sound, "{:?}", t[2]);
+    // Turning the loop off alone keeps the sound.
+    s.execute("transition.sound", &json!({"loop": false, "index": 0})).unwrap();
+    let t0 = s.doc().unwrap().doc.slides[0].transition.clone().unwrap();
+    assert!(t0.sound.is_some() && !t0.sound_loop);
+    assert!(s.execute("transition.sound", &json!({"builtin": "foghorn"})).is_err());
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 90535b56..7e931890 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1393,21 +1393,40 @@ fn transitions(app: &mut SlideApp, ui: &mut Ui) {
         rows(ui, |ui| {
             ui.horizontal(|ui| {
                 ui.label("Sound:");
+                let stop = cur.as_ref().is_some_and(|t| t.stop_sound);
                 let name = cur
                     .as_ref()
                     .and_then(|t| t.sound)
-                    .and_then(|m| app.session.active().and_then(|d| d.doc.media(m).map(|i| i.name.clone())))
-                    .unwrap_or_else(|| "[No Sound]".into());
-                egui::ComboBox::from_id_salt("transition_sound").width(120.0).selected_text(name).show_ui(ui, |ui| {
-                    if ui.selectable_label(cur.as_ref().is_none_or(|t| t.sound.is_none()), "[No Sound]").clicked() {
+                    .and_then(|m| app.session.active().and_then(|d| d.doc.media(m).map(|i| i.name.trim_end_matches(".wav").to_string())))
+                    .unwrap_or_else(|| if stop { "[Stop Previous Sound]".into() } else { "[No Sound]".into() });
+                egui::ComboBox::from_id_salt("transition_sound").width(140.0).selected_text(name).show_ui(ui, |ui| {
+                    let none = cur.as_ref().is_none_or(|t| t.sound.is_none() && !t.stop_sound);
+                    if ui.selectable_label(none, "[No Sound]").clicked() {
                         run(app, "transition.sound", json!({"none": true}));
                     }
+                    if ui.selectable_label(stop, "[Stop Previous Sound]").clicked() {
+                        run(app, "transition.sound", json!({"stopPrevious": true}));
+                    }
+                    ui.separator();
+                    for (id, label) in deckcraft_engine::sounds::BUILTIN {
+                        if ui.button(label).clicked() {
+                            let lp = cur.as_ref().is_some_and(|t| t.sound_loop);
+                            run(app, "transition.sound", json!({"builtin": id, "loop": lp}));
+                        }
+                    }
+                    ui.separator();
                     let can_pick = app.services.pick_open.is_some();
                     let r = ui.add_enabled(can_pick, egui::Button::new("Other Sound…"));
                     if r.clicked() {
                         app.pick_transition_sound();
                     }
                     r.on_disabled_hover_text("Choosing a sound file needs the desktop app");
+                    ui.separator();
+                    let has = cur.as_ref().is_some_and(|t| t.sound.is_some());
+                    let mut lp = cur.as_ref().is_some_and(|t| t.sound_loop);
+                    if ui.add_enabled(has, egui::Checkbox::new(&mut lp, "Loop Until Next Sound")).changed() {
+                        run(app, "transition.sound", json!({"loop": lp}));
+                    }
                 });
             });
         });
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index aee3168a..275861a6 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -697,7 +697,11 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
         return;
     }
     show.media_slide = cur;
-    let sound = cur.and_then(|i| doc.slides.get(i)).and_then(|s| s.transition.as_ref()).and_then(|t| t.sound);
+    let trans = cur.and_then(|i| doc.slides.get(i)).and_then(|s| s.transition.as_ref());
+    let sound = trans.and_then(|t| t.sound);
+    let sound_loop = trans.is_some_and(|t| t.sound_loop);
+    // [Stop Previous Sound] ends a transition sound still playing.
+    let stop_previous = trans.is_some_and(|t| t.stop_sound);
     let keep: Vec<ShapeId> = match cur {
         Some(_) => app
             .media
@@ -705,7 +709,7 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
             .into_iter()
             .filter(|id| crate::media::find_clip(doc, *id).is_some_and(|c| c.play_across_slides))
             // A transition sound plays to its end, as in PowerPoint, unless the new slide has its own.
-            .chain(sound.is_none().then_some(TRANSITION_SOUND).filter(|id| app.media.is_playing(*id)))
+            .chain((sound.is_none() && !stop_previous).then_some(TRANSITION_SOUND).filter(|id| app.media.is_playing(*id)))
             .collect(),
         None => vec![],
     };
@@ -715,7 +719,8 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
         }
     }
     if let Some(media) = sound {
-        let clip = deckcraft_model::MediaClip { media, volume: 1.0, ..Default::default() };
+        // Loop Until Next Sound: it repeats until another slide's sound or Stop Previous Sound.
+        let clip = deckcraft_model::MediaClip { media, volume: 1.0, loop_play: sound_loop, ..Default::default() };
         app.media.play(doc, TRANSITION_SOUND, &clip, None, crate::media::Owner::Show);
     }
     if let Some(i) = cur {
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 436a0dee..1ff7d0bd 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -39,7 +39,7 @@ perspective-correct subdivided meshes.
 |---|---|---|
 | Effect Options per transition | yes | yes |
 | Duration, advance on click / after time, Apply To All | yes | yes |
-| Transition sounds | yes | partly: Transitions › Sound › Other Sound… embeds a file, it plays as the slide comes in and round-trips; no built-in sounds, Stop Previous Sound or Loop Until Next Sound |
+| Transition sounds | yes | yes: Transitions › Sound offers six built-in sounds (synthesised, no sound files shipped), Other Sound…, [Stop Previous Sound] and Loop Until Next Sound; they play in the show and round-trip |
 | Preview in the editor | yes | yes |
 | Morph: objects move, resize, recolour | yes | yes |
 | Morph: Words and Characters | yes | yes (#5) |
@@ -84,7 +84,7 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 | Animation Pane timeline, preview from selected, effect dialog depth | 5–8 |
 | The remaining ~126 effects (most are parameter variations of existing ones) | 3–6 |
 | Rewind and other effect options on round trip (#77) | 1–2 |
-| Transition sounds: built-in sounds, Stop Previous Sound, Loop Until Next Sound | 1–2 |
+| Transition sounds: the rest of PowerPoint's built-in list (Applause, Arrow, Bomb…) | 1 |
 | Morph across pictures, `!!` names, align once per transition (#67) | 2–4 |
 | Cloth, paper and particle transitions as real meshes (Curtains, Peel Off, Page Curl, Airplane, Origami, Vortex, Shred, Honeycomb) | 4–8 |
 | **Total** | **~16–30** (the Transitions and Animations rows of the feature table; part of the Features dimension's 140–240 h) |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 5906ee5a..a90c9b43 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -199,7 +199,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Transitions | Transition gallery (fade, push, wipe, split, cover, uncover, zoom, morph…) | P0 | D |
 | Transitions | Effect options and duration | P0 | D |
 | Transitions | Advance on click / after time, apply to all | P0 | D |
-| Transitions | Transition sounds | P2 | P |
+| Transitions | Transition sounds | P2 | D |
 | Transitions | Morph | P1 | D |
 | Animations | Entrance, emphasis, exit effects | P0 | D |
 | Animations | Motion paths | P1 | P |

From 6a85afa236767bb006e79ddcae565cda444492d4 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:34:29 +0300
Subject: [PATCH 157/376] Pptx: round-trip an owned corpus and keep
 notes-master text

Open, save and reopen decks we author, and compare package parts and
text. The check showed a notes master's header and footer were replaced
by an empty notes master on save.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                   |   8 +-
 crates/pptx/src/read/mod.rs  |  11 +-
 crates/pptx/src/write/mod.rs |  55 ++++-
 crates/pptx/tests/corpus.rs  | 382 +++++++++++++++++++++++++++++++++++
 docs/file-format-parity.md   |  14 +-
 docs/gaps.md                 |  23 ++-
 docs/roadmap.md              |  11 +-
 7 files changed, 469 insertions(+), 35 deletions(-)
 create mode 100644 crates/pptx/tests/corpus.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..ee23ed3f 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (progress log: owned PPTX corpus round-trip, notes-master header and footer; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -111,8 +111,8 @@ Ranked; detail and the full beta plan in [docs/roadmap.md](docs/roadmap.md).
 
 1. **No data loss, no startup crashes:** Close's save prompt (#60), Windows GPU crashes (#40, #59),
    image paste (#53), editor soak tests. 10–20 h.
-2. **PPTX on real decks:** owned corpus, round-trip checks, fixes; #70, #74, #77; EMF/WMF and SVG.
-   36–64 h.
+2. **PPTX on real decks:** a larger owned corpus and the remaining round-trip losses; #70, #74, #77;
+   EMF/WMF and SVG. 36–64 h.
 3. **Localization:** catalog, system language (#15), zh-Hans, es, fr, de, ja with IME. 27–46 h.
 4. **Output:** vector PDF, printing. 10–16 h.
 5. **Depth that users hit:** font weights (#69), chart data and elements, Animation Pane timeline,
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | PPTX corpus round-trip for decks we author (open → save → reopen, package parts and text). A notes master's header and footer are kept instead of being replaced by an empty notes master |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: owned PPTX corpus round-trip; notes-master header and footer |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..ac989518 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -377,12 +377,19 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
             let tp = Part::new(&pkg, &t.target, &td);
             m.theme = theme::read_theme(&mut imp, &tp, &td.root);
         }
-        if let Some(tree) = d.root.path(&["cSld", "spTree"]) {
-            m.shapes = shapes::sp_tree(&mut imp, &part, &mut ctx, tree, 0);
+        if let Some(csld) = d.root.child("cSld") {
+            m.background = background(&mut imp, &part, csld);
+            if let Some(tree) = csld.child("spTree") {
+                m.shapes = shapes::sp_tree(&mut imp, &part, &mut ctx, tree, 0);
+            }
         }
         if let Some(cm) = d.root.child("clrMap") {
             m.color_map = color_map(cm);
         }
+        // Notes text styles are the body's list style; slide masters use title/body/other instead.
+        if let Some(ns) = d.root.child("notesStyle") {
+            m.body_style = dml::list_style(&mut imp, &part, ns);
+        }
         p.notes_master = Some(Arc::new(m));
     }
     // Document properties.
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..c2a146e1 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -10,7 +10,8 @@ use std::collections::HashMap;
 use std::sync::Arc;
 
 use deckcraft_geom::Xfrm;
-use deckcraft_model::text::{Paragraph, TextBody};
+use deckcraft_model::text::{ListStyle, Paragraph, TextBody};
+use deckcraft_model::theme::Theme;
 use deckcraft_model::{
     Background, Comment, Layout, LayoutId, Master, MediaId, PhType, Placeholder, Presentation, Shape, ShapeId, Slide, SlideId, defaults,
 };
@@ -308,7 +309,42 @@ fn notes_master_shapes(size: deckcraft_geom::Size) -> Vec<Shape> {
     ]
 }
 
-fn notes_style() -> deckcraft_model::text::ListStyle {
+/// What the notes master should be on save. A master we read is written back, including its
+/// header, footer, date and slide-number text. A deck that has never had one gets the placeholders
+/// we generate.
+struct NotesMasterWrite {
+    shapes: Vec<Shape>,
+    background: Option<Background>,
+    color_map: Vec<(String, String)>,
+    style: ListStyle,
+    theme: Option<Theme>,
+}
+
+fn notes_master_write(p: &Presentation) -> Option<NotesMasterWrite> {
+    let kept = p.notes_master.as_ref().filter(|m| !m.shapes.is_empty());
+    let has_notes = p.slides.iter().any(|s| !s.notes.is_empty());
+    if !has_notes && kept.is_none() {
+        return None;
+    }
+    Some(match kept {
+        Some(m) => NotesMasterWrite {
+            shapes: m.shapes.clone(),
+            background: m.background.clone(),
+            color_map: m.color_map.clone(),
+            style: if m.body_style.is_empty() { notes_style() } else { m.body_style.clone() },
+            theme: Some(m.theme.clone()),
+        },
+        None => NotesMasterWrite {
+            shapes: notes_master_shapes(p.notes_size),
+            background: Some(Background::Ref { idx: 1001, color: deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Bg1) }),
+            color_map: vec![],
+            style: notes_style(),
+            theme: None,
+        },
+    })
+}
+
+fn notes_style() -> ListStyle {
     let mut ls = deckcraft_model::text::ListStyle::default();
     for i in 0..9u8 {
         ls.set(
@@ -434,25 +470,24 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         master_rids.push((master_id, pres.rels.add("slideMaster", &opc::relative("ppt/presentation.xml", &mname), false)));
     }
 
-    // Notes master when any slide has notes.
-    let has_notes = p.slides.iter().any(|s| !s.notes.is_empty());
+    // Notes master when a slide has notes, or the file already has one (its header and footer
+    // live on the master, not on the notes slides).
     let notes_master = "ppt/notesMasters/notesMaster1.xml";
     let mut notes_master_rid = None;
-    if has_notes {
+    if let Some(nm) = notes_master_write(p) {
         let tname = format!("ppt/theme/theme{}.xml", p.masters.len() + 1);
         let mut no = Out::new(notes_master);
         no.rels.add("theme", &opc::relative(notes_master, &tname), false);
-        let theme = p.notes_master.as_ref().map(|m| m.theme.clone()).or_else(|| p.masters.first().map(|m| m.theme.clone())).unwrap_or_default();
+        let theme = nm.theme.or_else(|| p.masters.first().map(|m| m.theme.clone())).unwrap_or_default();
         let mut to = Out::new(&tname);
         let txml = theme::theme_xml(&mut x, &mut to, &theme);
         x.pkg.xml_part(&tname, CT_THEME, txml);
         x.pkg.rels(&tname, &to.rels);
         let mut w = W::new();
         root_open(&mut w, "p:notesMaster", A::new());
-        let bg = Background::Ref { idx: 1001, color: deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Bg1) };
-        csld(&mut w, &mut x, &mut no, "", Some(&bg), &notes_master_shapes(p.notes_size));
-        clr_map(&mut w, &[]);
-        dml::list_style(&mut w, &mut x, &mut no, "p:notesStyle", &notes_style());
+        csld(&mut w, &mut x, &mut no, "", nm.background.as_ref(), &nm.shapes);
+        clr_map(&mut w, &nm.color_map);
+        dml::list_style(&mut w, &mut x, &mut no, "p:notesStyle", &nm.style);
         w.close("p:notesMaster");
         x.pkg.xml_part(notes_master, CT_NOTES_MASTER, w.finish());
         x.pkg.rels(notes_master, &no.rels);
diff --git a/crates/pptx/tests/corpus.rs b/crates/pptx/tests/corpus.rs
new file mode 100644
index 00000000..1f14f6ee
--- /dev/null
+++ b/crates/pptx/tests/corpus.rs
@@ -0,0 +1,382 @@
+//! Owned corpus: decks this repository authors, then open → save → reopen.
+//!
+//! Each package is built here (nothing from another product). The check compares the text in the
+//! package and the content parts. A second save must come out the same as the first.
+
+use std::collections::BTreeMap;
+use std::io::{Cursor, Read, Write};
+use std::sync::Arc;
+
+use deckcraft_model::chart::{Chart, ChartType};
+use deckcraft_model::style::PictureFill;
+use deckcraft_model::table::Table;
+use deckcraft_model::text::{Action, Hyperlink, Paragraph, Run, RunProps, TextBody};
+use deckcraft_model::{Comment, Geom, PhType, Presentation, ShapeKind, Slide, defaults};
+
+fn png(w: u32, h: u32, rgb: [u8; 3]) -> Vec<u8> {
+    let img = image::RgbImage::from_pixel(w, h, image::Rgb(rgb));
+    let mut out = Cursor::new(vec![]);
+    image::DynamicImage::ImageRgb8(img).write_to(&mut out, image::ImageFormat::Png).expect("png");
+    out.into_inner()
+}
+
+fn shape(p: &mut Presentation, name: &str, x: f64, y: f64, w: f64, h: f64) -> deckcraft_model::Shape {
+    deckcraft_model::Shape {
+        id: deckcraft_model::ShapeId(p.alloc_id()),
+        name: name.into(),
+        xfrm: Some(deckcraft_geom::Xfrm::new(x, y, w, h)),
+        ..Default::default()
+    }
+}
+
+fn new_slide(p: &mut Presentation, title: &str) -> Slide {
+    let layout = defaults::layout_of_kind(p, deckcraft_model::LayoutType::TitleOnly).unwrap_or_default();
+    let mut s = defaults::new_slide(p, layout);
+    if let Some(t) = s.shapes.first_mut() {
+        t.text = Some(TextBody::from_text(title));
+    }
+    s
+}
+
+/// A short talk: title, notes, a link, a comment, a picture, a table and a chart.
+fn talk() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    p.props.title = "Quarterly review".into();
+    p.props.subject = "Owned corpus".into();
+    p.props.author = "DeckCraft tests".into();
+    let img = p.add_media("mark.png", "image/png", png(4, 4, [20, 90, 160]));
+
+    {
+        let id = p.slides[0].id;
+        let s = p.slide_mut(id).expect("slide");
+        s.notes = TextBody::from_text("Say the number slowly");
+        if let Some(t) = s.shapes.first_mut() {
+            t.text = Some(TextBody {
+                paragraphs: vec![Paragraph {
+                    runs: vec![
+                        Run::new("Quarterly review"),
+                        Run::with(
+                            "North report",
+                            RunProps {
+                                link: Some(Hyperlink {
+                                    action: Action::Url { url: "https://example.org/north?q=1&x=2".into() },
+                                    tooltip: "Open the report".into(),
+                                    highlight_click: false,
+                                }),
+                                ..Default::default()
+                            },
+                        ),
+                    ],
+                    ..Default::default()
+                }],
+                ..Default::default()
+            });
+        }
+        s.comments = vec![Comment {
+            author: "Ada".into(),
+            initials: "AL".into(),
+            text: "Ada checks the axis".into(),
+            date: "2026-03-04T05:06:07.000".into(),
+            x: 40.0,
+            y: 40.0,
+            ..Default::default()
+        }];
+    }
+
+    let mut s = new_slide(&mut p, "Figures");
+    let mut pic = shape(&mut p, "Mark", 60.0, 80.0, 80.0, 80.0);
+    pic.kind = ShapeKind::Picture { fill: PictureFill { media: img, ..Default::default() } };
+    pic.geom = Geom::preset("rect");
+    let mut table = Table::new(2, 2, 200.0, 24.0);
+    for (r, c, text) in [(0, 0, "Region"), (0, 1, "Amount"), (1, 0, "North"), (1, 1, "12")] {
+        if let Some(cell) = table.cell_mut(r, c) {
+            cell.text = TextBody::from_text(text);
+        }
+    }
+    let mut ts = shape(&mut p, "Regions", 160.0, 80.0, 200.0, 48.0);
+    ts.kind = ShapeKind::Table(table);
+    let mut chart = Chart::sample(ChartType::Column);
+    chart.title = Some("Revenue".into());
+    chart.categories = vec!["Jan".into(), "Feb".into()];
+    chart.series.truncate(1);
+    if let Some(series) = chart.series.first_mut() {
+        series.name = "Actual".into();
+        series.values = vec![Some(10.0), Some(20.0)];
+    }
+    chart.axis_titles = (Some("Month".into()), Some("Amount due".into()));
+    let mut ch = shape(&mut p, "Revenue chart", 400.0, 80.0, 280.0, 180.0);
+    ch.kind = ShapeKind::Chart(Box::new(chart));
+    s.shapes.extend([pic, ts, ch]);
+    p.slides.push(Arc::new(s));
+    p
+}
+
+struct Pkg {
+    parts: BTreeMap<String, Vec<u8>>,
+}
+
+impl Pkg {
+    fn open(bytes: &[u8]) -> Self {
+        let mut zip = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+        let mut parts = BTreeMap::new();
+        for i in 0..zip.len() {
+            let mut f = zip.by_index(i).expect("entry");
+            if f.is_dir() {
+                continue;
+            }
+            let name = f.name().trim_start_matches('/').to_string();
+            let mut data = vec![];
+            f.read_to_end(&mut data).expect("read");
+            parts.insert(name, data);
+        }
+        Pkg { parts }
+    }
+
+    fn replace(&self, name: &str, data: Vec<u8>) -> Vec<u8> {
+        let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+        let opts = zip::write::SimpleFileOptions::default();
+        let mut wrote = false;
+        for (n, bytes) in &self.parts {
+            let body = if n == name {
+                wrote = true;
+                data.as_slice()
+            } else {
+                bytes.as_slice()
+            };
+            out.start_file(n, opts).expect("start");
+            out.write_all(body).expect("write");
+        }
+        assert!(wrote, "missing part {name}");
+        out.finish().expect("finish").into_inner()
+    }
+}
+
+fn xml_text(parts: &BTreeMap<String, Vec<u8>>) -> BTreeMap<String, usize> {
+    let mut counts = BTreeMap::new();
+    for (name, bytes) in parts {
+        let lower = name.to_ascii_lowercase();
+        if !(lower.ends_with(".xml") || lower.ends_with(".rels")) {
+            continue;
+        }
+        let Ok(xml) = std::str::from_utf8(bytes) else { continue };
+        for tag in ["a:t", "c:v", "p:text", "dc:title", "dc:subject", "dc:creator", "dc:description"] {
+            for text in element_texts(xml, tag) {
+                if !text.is_empty() {
+                    *counts.entry(text).or_insert(0) += 1;
+                }
+            }
+        }
+        for url in attr_values(xml, "Target") {
+            if url.starts_with("http://") || url.starts_with("https://") {
+                *counts.entry(url).or_insert(0) += 1;
+            }
+        }
+        for tip in attr_values(xml, "tooltip") {
+            if !tip.is_empty() {
+                *counts.entry(tip).or_insert(0) += 1;
+            }
+        }
+    }
+    counts
+}
+
+fn element_texts(xml: &str, tag: &str) -> Vec<String> {
+    let mut out = vec![];
+    let open = format!("<{tag}");
+    let mut rest = xml;
+    while let Some(i) = rest.find(&open) {
+        let after = &rest[i + open.len()..];
+        let boundary = after.chars().next();
+        if !matches!(boundary, Some('>' | '/' | ' ' | '\n' | '\t' | '\r')) {
+            rest = after;
+            continue;
+        }
+        let Some(gt) = after.find('>') else { break };
+        if after.as_bytes().get(gt.saturating_sub(1)) == Some(&b'/') {
+            rest = &after[gt + 1..];
+            continue;
+        }
+        let body = &after[gt + 1..];
+        let close = format!("</{tag}>");
+        let Some(end) = body.find(&close) else { break };
+        out.push(decode_xml(&body[..end]));
+        rest = &body[end + close.len()..];
+    }
+    out
+}
+
+fn attr_values(xml: &str, name: &str) -> Vec<String> {
+    let mut out = vec![];
+    let key = format!("{name}=\"");
+    let mut rest = xml;
+    while let Some(i) = rest.find(&key) {
+        let after = &rest[i + key.len()..];
+        let Some(end) = after.find('"') else { break };
+        out.push(decode_xml(&after[..end]));
+        rest = &after[end + 1..];
+    }
+    out
+}
+
+fn decode_xml(s: &str) -> String {
+    let mut out = String::new();
+    let mut rest = s;
+    while let Some(i) = rest.find('&') {
+        out.push_str(&rest[..i]);
+        let after = &rest[i..];
+        let Some(end) = after.find(';') else {
+            out.push_str(after);
+            return out;
+        };
+        let ent = &after[1..end];
+        let ch = match ent {
+            "amp" => "&".into(),
+            "lt" => "<".into(),
+            "gt" => ">".into(),
+            "quot" => "\"".into(),
+            "apos" => "'".into(),
+            hex if hex.starts_with("#x") || hex.starts_with("#X") => {
+                u32::from_str_radix(&hex[2..], 16).ok().and_then(char::from_u32).map(|c| c.to_string()).unwrap_or_default()
+            }
+            dec if dec.starts_with('#') => dec[1..].parse::<u32>().ok().and_then(char::from_u32).map(|c| c.to_string()).unwrap_or_default(),
+            _ => String::new(),
+        };
+        out.push_str(&ch);
+        rest = &after[end + 1..];
+    }
+    out.push_str(rest);
+    out
+}
+
+fn part_count(parts: &BTreeMap<String, Vec<u8>>, pred: impl Fn(&str) -> bool) -> usize {
+    parts.keys().filter(|n| pred(n)).count()
+}
+
+fn content_counts(parts: &BTreeMap<String, Vec<u8>>) -> [usize; 6] {
+    let is = |prefix: &str, name: &str| {
+        let n = name.to_ascii_lowercase();
+        n.starts_with(prefix) && n.ends_with(".xml") && !n.contains("_rels")
+    };
+    [
+        part_count(parts, |n| is("ppt/slides/slide", n)),
+        part_count(parts, |n| is("ppt/notesslides/notesslide", n)),
+        part_count(parts, |n| is("ppt/notesmasters/notesmaster", n)),
+        part_count(parts, |n| is("ppt/charts/chart", n)),
+        part_count(parts, |n| n.to_ascii_lowercase().starts_with("ppt/media/") && !n.to_ascii_lowercase().contains("_rels")),
+        part_count(parts, |n| is("ppt/comments/comment", n)),
+    ]
+}
+
+fn lost<'a>(origin: &'a BTreeMap<String, usize>, saved: &BTreeMap<String, usize>) -> Vec<(&'a str, usize, usize)> {
+    origin
+        .iter()
+        .filter_map(|(s, n)| {
+            let got = saved.get(s).copied().unwrap_or(0);
+            (got < *n).then_some((s.as_str(), *n, got))
+        })
+        .collect()
+}
+
+/// Open, save, reopen. Text from the original is still there, content parts are still there, and
+/// saving again does not change the package's part names or text.
+fn round_trip(label: &str, bytes: &[u8]) -> (Pkg, Pkg) {
+    let origin = Pkg::open(bytes);
+    let once = deckcraft_pptx::export(&deckcraft_pptx::import(bytes).unwrap_or_else(|e| panic!("{label}: import: {e}")))
+        .unwrap_or_else(|e| panic!("{label}: save: {e}"));
+    let saved = Pkg::open(&once);
+    let origin_text = xml_text(&origin.parts);
+    let missing = lost(&origin_text, &xml_text(&saved.parts));
+    assert!(missing.is_empty(), "{label}: text lost on save: {missing:?}");
+    assert_eq!(content_counts(&origin.parts), content_counts(&saved.parts), "{label}: content parts changed");
+    let again = deckcraft_pptx::export(&deckcraft_pptx::import(&once).unwrap_or_else(|e| panic!("{label}: reopen: {e}")))
+        .unwrap_or_else(|e| panic!("{label}: second save: {e}"));
+    let saved2 = Pkg::open(&again);
+    assert_eq!(saved.parts.keys().collect::<Vec<_>>(), saved2.parts.keys().collect::<Vec<_>>(), "{label}: part names changed on the second save");
+    assert_eq!(xml_text(&saved.parts), xml_text(&saved2.parts), "{label}: text changed on the second save");
+    (origin, saved)
+}
+
+fn set_placeholder_text(xml: &str, ph: &str, text: &str) -> String {
+    let needle = format!("type=\"{ph}\"");
+    let at = xml.find(&needle).unwrap_or_else(|| panic!("notes master has no {ph} placeholder"));
+    let after = &xml[at..];
+    let start_rel = after.find("<p:txBody>").unwrap_or_else(|| panic!("no txBody after {ph}"));
+    let end_rel = after.find("</p:txBody>").unwrap_or_else(|| panic!("no txBody end after {ph}"));
+    assert!(start_rel < end_rel, "{ph} txBody is out of order");
+    let start = at + start_rel;
+    let end = at + end_rel + "</p:txBody>".len();
+    let body = format!("<p:txBody><a:bodyPr/><a:lstStyle/><a:p><a:r><a:t>{text}</a:t></a:r></a:p></p:txBody>");
+    let mut out = String::with_capacity(xml.len() + body.len());
+    out.push_str(&xml[..start]);
+    out.push_str(&body);
+    out.push_str(&xml[end..]);
+    out
+}
+
+/// A received deck whose notes master carries the header and footer (where PowerPoint stores them).
+fn notes_header_deck() -> Vec<u8> {
+    let mut p = defaults::new_presentation(None);
+    let id = p.slides[0].id;
+    let s = p.slide_mut(id).expect("slide");
+    if let Some(t) = s.shapes.first_mut() {
+        t.text = Some(TextBody::from_text("Quarterly review"));
+    }
+    s.notes = TextBody::from_text("Pause after the title");
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let pkg = Pkg::open(&bytes);
+    let master = pkg.parts.get("ppt/notesMasters/notesMaster1.xml").expect("notes master").clone();
+    let xml = String::from_utf8(master).expect("utf8");
+    let xml = set_placeholder_text(&xml, "hdr", "Acme review");
+    let xml = set_placeholder_text(&xml, "ftr", "Do not circulate");
+    pkg.replace("ppt/notesMasters/notesMaster1.xml", xml.into_bytes())
+}
+
+fn placeholder_text(p: &Presentation, kind: PhType) -> String {
+    p.notes_master
+        .as_ref()
+        .and_then(|m| m.shapes.iter().find(|s| s.ph_type() == Some(kind)))
+        .and_then(|s| s.text.as_ref())
+        .map(|t| t.text())
+        .unwrap_or_default()
+}
+
+#[test]
+fn owned_corpus_round_trip_keeps_parts_and_text() {
+    let talk_bytes = deckcraft_pptx::export(&talk()).expect("talk");
+    let (origin, saved) = round_trip("talk", &talk_bytes);
+    let text = xml_text(&origin.parts);
+    for s in [
+        "Quarterly review",
+        "North report",
+        "Say the number slowly",
+        "Region",
+        "North",
+        "Revenue",
+        "Jan",
+        "Feb",
+        "Actual",
+        "Month",
+        "Amount due",
+        "Ada checks the axis",
+        "Owned corpus",
+        "DeckCraft tests",
+        "https://example.org/north?q=1&x=2",
+        "Open the report",
+    ] {
+        assert!(text.contains_key(s), "talk corpus is missing {s:?}");
+    }
+    let mark = png(4, 4, [20, 90, 160]);
+    assert!(saved.parts.values().any(|b| b == &mark), "the picture bytes did not survive the save");
+    assert_eq!(content_counts(&origin.parts), [2, 1, 1, 1, 1, 1], "talk corpus shape");
+
+    let notes = notes_header_deck();
+    let _ = round_trip("notes header", &notes);
+    let opened = deckcraft_pptx::import(&notes).expect("import notes header");
+    assert_eq!(placeholder_text(&opened, PhType::Header), "Acme review");
+    assert_eq!(placeholder_text(&opened, PhType::Footer), "Do not circulate");
+    let saved = deckcraft_pptx::export(&opened).expect("save notes header");
+    let reopened = deckcraft_pptx::import(&saved).expect("reopen notes header");
+    assert_eq!(placeholder_text(&reopened, PhType::Header), "Acme review");
+    assert_eq!(placeholder_text(&reopened, PhType::Footer), "Do not circulate");
+    assert_eq!(reopened.slides[0].notes_text(), "Pause after the title");
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..a70a30c8 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus round-trip; notes-master header and footer text kept; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -16,7 +16,7 @@ PowerPoint opens and saves; Viewer = opens only).
 
 | Format | PowerPoint | DeckCraft read | DeckCraft write | Fidelity / notes | Tested by |
 |---|---|---|---|---|---|
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); never measured on real decks | `crates/pptx/tests/roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs` (30 tests); opened in PowerPoint by hand 2026-10-06 |
+| `.pptx` presentation | Editor | yes | yes | Broad (see below); corpus is decks we author, not measured against PowerPoint renders | `crates/pptx/tests/corpus.rs`, `roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
 | `.potx` template | Editor | yes (as a presentation) | no: written with the `.pptx` content type | `file.saveTemplate` is Save As under another name | none |
 | `.ppsx` slide show | Editor | yes (as a presentation) | no: written as `.pptx` content | Doesn't start in show mode | none |
 | `.pptm` / `.potm` / `.ppsm` macro-enabled | Editor | no | no | Should open and keep `vbaProject.bin` without running it | none |
@@ -61,7 +61,7 @@ the round trip even though DeckCraft doesn't model it.
 | Presentation, slide size, sections (p14), custom shows | yes | yes | |
 | Slide masters, layouts, placeholders and inheritance | yes | yes | |
 | Themes: colour, font (Latin/EA/CS), effect schemes, background styles | yes | yes | Unknown theme parts kept |
-| Notes slides and notes master | yes | yes | No notes-master editing view |
+| Notes slides and notes master | yes | yes | Header, footer, date and slide-number text on the notes master is kept. No notes-master editing view |
 | Handout master | no | no | |
 | Shapes: preset geometry (~180 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in `crates/geom/src/preset.rs` (and `preset/extra.rs`). Outlines, dashes, arrowheads and ink inside a group, and text, keep their size in points whatever the group's child-coordinate scale (#233). |
 | Fills: solid, gradient, picture (stretch/tile/crop), pattern, group | yes | yes | |
@@ -89,9 +89,10 @@ the round trip even though DeckCraft doesn't model it.
 
 ### What would move the PPTX number
 
-1. An owned corpus of real-world-shaped decks (corporate templates, SmartArt, chartex charts, EMF,
-   embedded fonts, every transition and animation) in a corpus repo, with import → render → export
-   → re-import checks in CI and a PowerPoint reference render for each (owner runs PowerPoint).
+1. A larger owned corpus (corporate templates, SmartArt, chartex charts, EMF, embedded fonts,
+   every transition and animation) in a corpus repo. `crates/pptx/tests/corpus.rs` already checks
+   open → save → reopen (parts and text) for decks we author. Still needed: render checks and a
+   PowerPoint reference render for each (owner runs PowerPoint).
 2. The round-trip losses above (#70, #74, #77).
 3. SVG rendering, and clip regions inside EMF/WMF.
 
@@ -99,6 +100,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Owned corpus round-trip (parts and text). Notes-master header, footer, date and slide-number text is written back |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..c66fafbd 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned PPTX corpus round-trip; notes-master header and footer kept; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -17,7 +17,7 @@ revision history.
 
 | # | Gap | Category | Beta | Hours | Doc |
 |---|---|---|:-:|---|---|
-| 1 | PPTX never tested against a corpus of real decks | File format | B | 20–35 | [file-format-parity.md](file-format-parity.md) |
+| 1 | PPTX corpus is only decks we author (no PowerPoint reference renders) | File format | B | 20–35 | [file-format-parity.md](file-format-parity.md) |
 | 2 | Data loss and crashes on common paths (#60, #40, #59) | Stability | B | 6–12 | this file |
 | 3 | PPTX round trip drops comment threads, media options, rewind (#70, #74, #77) | File format | B | 3–6 | [file-format-parity.md](file-format-parity.md) |
 | 4 | SVG pictures don't render (EMF/WMF do) | File format | B | 6–12 | [file-format-parity.md](file-format-parity.md) |
@@ -58,15 +58,17 @@ revision history.
 
 Detail in [file-format-parity.md](file-format-parity.md).
 
-### PPTX has never met a corpus of real decks
-- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests) uses decks DeckCraft generates;
-  the 2026-10-07 alpha checklist already listed this as open. No reference renders from PowerPoint
-  exist to compare against.
+### PPTX corpus is only decks we author
+- **Evidence:** `crates/pptx/tests/corpus.rs` builds decks in this repo and checks open → save →
+  reopen (package parts and text): a talk with a table, chart, picture, link and comment, and a
+  notes master with a header and footer. Saving used to replace that notes master with an empty
+  one, so "Acme review" and "Do not circulate" disappeared; they are kept now. There is still no
+  larger corpus and no reference render from PowerPoint.
 - **Impact:** the main reason to switch is "open my PowerPoint decks". Fidelity on real decks
-  (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is unknown.
-- **Estimate:** 20–35 h: build an owned corpus in `storytold/photocraft-corpus` style (craftrules
-  `standards/test-corpora.md`), add import → render → export → re-import checks, have the owner open
-  outputs in PowerPoint, fix what breaks. **Beta blocker.**
+  (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is still mostly unknown.
+- **Estimate:** 20–35 h: grow the owned corpus in `storytold/photocraft-corpus` style (craftrules
+  `standards/test-corpora.md`), add render checks, have the owner open outputs in PowerPoint, fix
+  what breaks. **Beta blocker.**
 
 ### Round trip loses comment threads, media playback options and animation rewind (#70, #74, #77)
 - **Evidence:** issues filed 2026-10-10 by an automated reviewer; the writer emits legacy comments
@@ -256,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Owned PPTX corpus round-trip (parts and text). Notes-master header and footer text is kept; the corpus gap is now a larger set and PowerPoint reference renders |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..7704b463 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus check started; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -26,8 +26,10 @@ points and lead the beta plan.
 
 1. **Stop losing work and crashing:** land Close's save prompt (#60, PR #75), the Windows GPU
    startup crashes (#40, #59), image paste on Windows/Linux (#53). 6–12 h.
-2. **PPTX on real decks:** build an owned corpus, round-trip checks in CI, fix what breaks;
-   comment threads, media options and rewind on save (#70, #74, #77); EMF/WMF and SVG. 31–55 h.
+2. **PPTX on real decks:** `crates/pptx/tests/corpus.rs` round-trips decks we author (open → save →
+   reopen, parts and text) and keeps a notes master's header and footer. Still open: a larger
+   corpus, comment threads, media options and rewind on save (#70, #74, #77), EMF/WMF and SVG.
+   31–55 h.
 3. **Review the open PRs:** equations (#55), browser print (#66), Morph alignment (#67), macOS
    open-with (#68), font lookup (#80), Ukrainian (#34, after the catalog exists). 4–8 h.
 
@@ -96,7 +98,7 @@ on common paths. On 2026-10-07 it was ~80% there with these blockers:
 | Blocker (2026-10-07) | Status 2026-10-10 |
 |---|---|
 | First real release run: signing, notarization, installers verified on each OS | Signed releases v0.1.0–v0.4.0 published; installers not hand-checked on each OS; Windows startup crashes on some GPUs (#40, #59) |
-| PPTX fidelity on a corpus of real decks | Still open; now beta item 2 |
+| PPTX fidelity on a corpus of real decks | First owned check in CI; notes-master header and footer kept. A larger corpus is still beta item 2 |
 | Presenter view and Animation Pane polish | Still open; beta items 9 and 10 |
 | Soak and fuzz the editor | Still open; beta item 1 |
 | UI fidelity pass on the most-used ribbon groups and dialogs; first run | Partly (start-screen fixes #20, #49); beta item 11 |
@@ -109,5 +111,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Owned PPTX corpus check started; notes-master header and footer kept. Beta item 2 stays open for a larger corpus |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |

From 9af5a7d17b8f685deeebe462c75dbaf1aab67756 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:35:55 +0300
Subject: [PATCH 158/376] =?UTF-8?q?Pictures:=20Artistic=20Effects=20?=
 =?UTF-8?q?=E2=80=94=20apply,=20change,=20remove=20and=20keep=20in=20PPTX?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

New picture.artisticEffect applies one of 7 effects (blur, pencil
grayscale, line drawing, film grain, cutout, glow edges, photocopy) to a
picture's pixels, as PowerPoint does: the processed PNG becomes the
picture and the original is kept on PictureFill::artistic, so another
effect starts from the original and `none` (or Reset Picture) restores
it. Change Picture drops the effect.

PPTX: written and read as PowerPoint does, the blip being the processed
picture with the original and the effect name in
a:extLst/a14:imgProps/a14:imgLayer, so a deck from PowerPoint keeps its
effect, original and all, when saved again.

Picture Format gets an Artistic Effects menu.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/artistic.rs | 199 ++++++++++++++++++++++++++++++
 crates/engine/src/cmd/mod.rs      |   2 +
 crates/engine/src/cmd/shape.rs    |   4 +
 crates/engine/src/tests.rs        |  54 ++++++++
 crates/model/src/style.rs         |  12 ++
 crates/pptx/src/read/dml.rs       |  11 ++
 crates/pptx/src/write/dml.rs      |  22 +++-
 crates/pptx/tests/roundtrip.rs    |   1 +
 crates/ui-egui/src/ribbon.rs      |  11 ++
 docs/gaps.md                      |   3 +-
 docs/parity-checklist.md          |   2 +-
 11 files changed, 318 insertions(+), 3 deletions(-)
 create mode 100644 crates/engine/src/cmd/artistic.rs

diff --git a/crates/engine/src/cmd/artistic.rs b/crates/engine/src/cmd/artistic.rs
new file mode 100644
index 00000000..8bdba6d1
--- /dev/null
+++ b/crates/engine/src/cmd/artistic.rs
@@ -0,0 +1,199 @@
+//! Picture Format ▸ Artistic Effects: a picture redrawn as a pencil sketch, blurred, grainy…
+//!
+//! The effect is applied to the pixels and the result becomes the picture, as PowerPoint does;
+//! the original is kept (`PictureFill::artistic`) so the effect can be changed or removed, and
+//! both are saved (`a14:imgLayer`). The effects approximate PowerPoint's look.
+
+use deckcraft_model::style::Artistic;
+use deckcraft_model::{MediaId, ShapeId, ShapeKind};
+use image::{GrayImage, Rgba, RgbaImage};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+/// The effects offered: `a14` element name and label.
+pub const EFFECTS: &[(&str, &str)] = &[
+    ("artisticBlur", "Blur"),
+    ("artisticPencilGrayscale", "Pencil Grayscale"),
+    ("artisticLineDrawing", "Line Drawing"),
+    ("artisticFilmGrain", "Film Grain"),
+    ("artisticCutout", "Cutout"),
+    ("artisticGlowEdges", "Glow Edges"),
+    ("artisticPhotocopy", "Photocopy"),
+];
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![cmd!(
+        "picture.artisticEffect",
+        "Artistic Effects",
+        ["Picture Format", "Adjust"],
+        None,
+        "{effect: none|artisticBlur|artisticPencilGrayscale|artisticLineDrawing|artisticFilmGrain|artisticCutout|artisticGlowEdges|artisticPhotocopy, ids?}",
+        has_selection,
+        artistic_effect
+    )]
+}
+
+/// Largest side processed; bigger pictures are scaled down first.
+const MAX_SIDE: u32 = 3000;
+
+fn luma(p: &Rgba<u8>) -> f32 {
+    0.299 * p[0] as f32 + 0.587 * p[1] as f32 + 0.114 * p[2] as f32
+}
+
+fn gray(img: &RgbaImage) -> GrayImage {
+    GrayImage::from_fn(img.width(), img.height(), |x, y| image::Luma([luma(img.get_pixel(x, y)).round().clamp(0.0, 255.0) as u8]))
+}
+
+/// Sobel edge strength, 0–255.
+fn edges(g: &GrayImage) -> GrayImage {
+    let (w, h) = g.dimensions();
+    let at = |x: i64, y: i64| g.get_pixel(x.clamp(0, w as i64 - 1) as u32, y.clamp(0, h as i64 - 1) as u32)[0] as f32;
+    GrayImage::from_fn(w, h, |x, y| {
+        let (x, y) = (x as i64, y as i64);
+        let gx = at(x + 1, y - 1) + 2.0 * at(x + 1, y) + at(x + 1, y + 1) - at(x - 1, y - 1) - 2.0 * at(x - 1, y) - at(x - 1, y + 1);
+        let gy = at(x - 1, y + 1) + 2.0 * at(x, y + 1) + at(x + 1, y + 1) - at(x - 1, y - 1) - 2.0 * at(x, y - 1) - at(x + 1, y - 1);
+        image::Luma([((gx * gx + gy * gy).sqrt() / 4.0).clamp(0.0, 255.0) as u8])
+    })
+}
+
+/// Applies `effect` to `img` (alpha kept).
+pub fn apply(effect: &str, img: &RgbaImage) -> Option<RgbaImage> {
+    let (w, h) = img.dimensions();
+    let scale = ((w * w + h * h) as f32).sqrt() / 1000.0;
+    let alpha = |x: u32, y: u32| img.get_pixel(x, y)[3];
+    let out = match effect {
+        "artisticBlur" => image::imageops::blur(img, (6.0 * scale).max(1.0)),
+        "artisticPencilGrayscale" | "artisticLineDrawing" | "artisticPhotocopy" => {
+            let soft = image::imageops::blur(&gray(img), (0.8 * scale).max(0.5));
+            let e = edges(&soft);
+            RgbaImage::from_fn(w, h, |x, y| {
+                let ev = e.get_pixel(x, y)[0] as f32;
+                let gv = soft.get_pixel(x, y)[0] as f32;
+                let v = match effect {
+                    "artisticPencilGrayscale" => 255.0 - ev * 2.0 - (255.0 - gv) * 0.25,
+                    "artisticLineDrawing" => {
+                        if ev > 28.0 {
+                            255.0 - (ev - 28.0) * 3.0
+                        } else {
+                            255.0
+                        }
+                    }
+                    _ => {
+                        if ev > 40.0 || gv < 70.0 {
+                            0.0
+                        } else {
+                            255.0
+                        }
+                    }
+                };
+                let v = v.clamp(0.0, 255.0) as u8;
+                Rgba([v, v, v, alpha(x, y)])
+            })
+        }
+        "artisticFilmGrain" => {
+            // Deterministic noise, so the same picture gives the same grain.
+            let mut seed: u32 = 0x9E37_79B9;
+            RgbaImage::from_fn(w, h, |x, y| {
+                seed ^= seed << 13;
+                seed ^= seed >> 17;
+                seed ^= seed << 5;
+                let n = (seed % 61) as f32 - 30.0;
+                let p = img.get_pixel(x, y);
+                let c = |v: u8| ((v as f32 - 128.0) * 1.1 + 128.0 + n).clamp(0.0, 255.0) as u8;
+                Rgba([c(p[0]), c(p[1]), c(p[2]), p[3]])
+            })
+        }
+        "artisticCutout" => {
+            let soft = image::imageops::blur(img, (1.5 * scale).max(0.5));
+            RgbaImage::from_fn(w, h, |x, y| {
+                let p = soft.get_pixel(x, y);
+                let q = |v: u8| ((v as f32 / 255.0 * 3.0).round() / 3.0 * 255.0) as u8;
+                Rgba([q(p[0]), q(p[1]), q(p[2]), alpha(x, y)])
+            })
+        }
+        "artisticGlowEdges" => {
+            let e = edges(&gray(img));
+            RgbaImage::from_fn(w, h, |x, y| {
+                let k = (e.get_pixel(x, y)[0] as f32 / 255.0 * 2.5).min(1.0);
+                let p = img.get_pixel(x, y);
+                let c = |v: u8| (v as f32 * k + 255.0 * k * 0.3).clamp(0.0, 255.0) as u8;
+                Rgba([c(p[0]), c(p[1]), c(p[2]), p[3]])
+            })
+        }
+        _ => return None,
+    };
+    Some(out)
+}
+
+/// Decodes `data`, applies `effect` and encodes a PNG.
+fn process(effect: &str, data: &[u8]) -> Result<Vec<u8>> {
+    let img = image::load_from_memory(data).map_err(|_| bad("picture.artisticEffect", "this picture's format can't be processed"))?;
+    let img = if img.width().max(img.height()) > MAX_SIDE { img.thumbnail(MAX_SIDE, MAX_SIDE) } else { img };
+    let out = apply(effect, &img.to_rgba8()).ok_or_else(|| bad("picture.artisticEffect", "unknown effect"))?;
+    let mut png = Vec::new();
+    image::DynamicImage::ImageRgba8(out)
+        .write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png)
+        .map_err(|_| bad("picture.artisticEffect", "the processed picture couldn't be stored"))?;
+    Ok(png)
+}
+
+fn artistic_effect(s: &mut Session, p: &Value) -> Result<Value> {
+    let effect = match str_param(p, "effect") {
+        Some("none") => None,
+        Some(e) if EFFECTS.iter().any(|(n, _)| *n == e) => Some(e.to_string()),
+        _ => return Err(bad("picture.artisticEffect", "`effect` is none or one of artisticBlur, artisticPencilGrayscale, …")),
+    };
+    let ids = targets(s, p)?;
+    let st = s.doc()?;
+    // (shape, original picture, its bytes and name)
+    let mut work: Vec<(ShapeId, MediaId, Option<(Vec<u8>, String)>)> = Vec::new();
+    for id in ids {
+        let Some(ShapeKind::Picture { fill }) = st.shape(id).map(|sh| &sh.kind) else { continue };
+        let original = fill.artistic.as_ref().map_or(fill.media, |a| a.original);
+        let item = st.doc.media(original).map(|m| (m.data.to_vec(), m.name.clone()));
+        work.push((id, original, item));
+    }
+    if work.is_empty() {
+        return Err(bad("picture.artisticEffect", "select a picture"));
+    }
+    let mut results: Vec<(ShapeId, MediaId, Option<(String, Vec<u8>)>)> = Vec::new();
+    for (id, original, item) in work {
+        let processed = match (&effect, item) {
+            (None, _) => None,
+            (Some(e), Some((data, name))) => {
+                Some((format!("{}-{}.png", name.rsplit_once('.').map_or(name.as_str(), |x| x.0), e), process(e, &data)?))
+            }
+            (Some(_), None) => return Err(bad("picture.artisticEffect", "the picture's data is missing")),
+        };
+        results.push((id, original, processed));
+    }
+    let effect2 = effect.clone();
+    s.edit(move |doc, sel| {
+        let mut set: Vec<(ShapeId, MediaId, Option<MediaId>)> = Vec::new();
+        for (id, original, processed) in &results {
+            let m = processed.as_ref().map(|(name, png)| doc.add_media(name, "image/png", png.clone()));
+            set.push((*id, *original, m));
+        }
+        let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("picture.artisticEffect", "no slide"))?;
+        for (id, original, m) in set {
+            if let Some(sh) = deckcraft_model::find_shape_mut(list, id)
+                && let ShapeKind::Picture { fill } = &mut sh.kind
+            {
+                match (m, &effect2) {
+                    (Some(m), Some(e)) => {
+                        fill.media = m;
+                        fill.artistic = Some(Artistic { effect: e.clone(), original });
+                    }
+                    _ => {
+                        fill.media = original;
+                        fill.artistic = None;
+                    }
+                }
+            }
+        }
+        Ok(())
+    })?;
+    Ok(json!({"effect": effect}))
+}
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..bb64e1a0 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -2,6 +2,7 @@
 
 pub mod animation;
 pub mod arrange;
+pub mod artistic;
 pub mod design;
 pub mod edit;
 pub mod file;
@@ -142,6 +143,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(review::specs());
         v.extend(inspect::specs());
         v.extend(media::specs());
+        v.extend(artistic::specs());
         v
     })
 }
diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..898d7a7e 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -664,6 +664,9 @@ fn picture_reset(s: &mut Session, p: &Value) -> Result<Value> {
             fill.adjust = Default::default();
             fill.crop = [0.0; 4];
             fill.alpha = None;
+            if let Some(a) = fill.artistic.take() {
+                fill.media = a.original;
+            }
         }
         sh.effects = None;
         sh.line = None;
@@ -679,6 +682,7 @@ fn picture_change(s: &mut Session, p: &Value) -> Result<Value> {
         if let deckcraft_model::ShapeKind::Picture { fill } = &mut sh.kind {
             fill.media = media;
             fill.crop = [0.0; 4];
+            fill.artistic = None;
         }
         Ok(())
     })
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..c5edc306 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,57 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn artistic_effects_apply_change_remove_and_round_trip() {
+    use deckcraft_model::ShapeKind;
+    let mut img = image::RgbaImage::new(40, 30);
+    for (x, y, p) in img.enumerate_pixels_mut() {
+        *p = if x < 20 { image::Rgba([200, 30, 30, 255]) } else { image::Rgba([20, 20, 220, if y < 5 { 0 } else { 255 }]) };
+    }
+    let mut png = Vec::new();
+    image::DynamicImage::ImageRgba8(img).write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png).unwrap();
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.picture", &json!({"name": "a.png", "data": cmd::base64_encode(&png)})).unwrap();
+    let fill = |s: &Session| match &s.doc().unwrap().selected_shapes()[0].kind {
+        ShapeKind::Picture { fill } => fill.clone(),
+        k => panic!("{k:?}"),
+    };
+    let original = fill(&s).media;
+    assert!(s.execute("picture.artisticEffect", &json!({"effect": "artisticBogus"})).is_err());
+    // Every effect draws something of the same size and keeps transparency.
+    for (e, _) in cmd::artistic::EFFECTS {
+        s.execute("picture.artisticEffect", &json!({"effect": e})).unwrap();
+        let f = fill(&s);
+        assert_eq!(f.artistic.as_ref().map(|a| (a.effect.as_str(), a.original)), Some((*e, original)));
+        assert_ne!(f.media, original);
+        let data = s.doc().unwrap().doc.media(f.media).unwrap().data.clone();
+        let out = image::load_from_memory(&data).unwrap().to_rgba8();
+        assert_eq!(out.dimensions(), (40, 30));
+        assert_eq!(out.get_pixel(30, 1)[3], 0, "{e}");
+    }
+    // A pencil sketch is grey.
+    s.execute("picture.artisticEffect", &json!({"effect": "artisticPencilGrayscale"})).unwrap();
+    let data = s.doc().unwrap().doc.media(fill(&s).media).unwrap().data.clone();
+    let out = image::load_from_memory(&data).unwrap().to_rgba8();
+    assert!(out.pixels().all(|p| p[0] == p[1] && p[1] == p[2]));
+    // Saved and reopened, the effect and the original are both there.
+    let bytes = cmd::file::save_bytes(&s.doc().unwrap().doc, "pptx").unwrap();
+    let mut t = Session::new();
+    t.execute("file.openBytes", &json!({"name": "a.pptx", "data": cmd::base64_encode(&bytes)})).unwrap();
+    let back = t.doc().unwrap().doc.slides.iter().flat_map(|sl| sl.shapes.iter()).find_map(|sh| match &sh.kind {
+        ShapeKind::Picture { fill } => Some(fill.clone()),
+        _ => None,
+    });
+    let back = back.unwrap();
+    let art = back.artistic.clone().unwrap();
+    assert_eq!(art.effect, "artisticPencilGrayscale");
+    assert_eq!(*t.doc().unwrap().doc.media(art.original).unwrap().data, png);
+    // None (and Reset Picture) puts the original back.
+    s.execute("picture.artisticEffect", &json!({"effect": "none"})).unwrap();
+    assert_eq!((fill(&s).media, fill(&s).artistic), (original, None));
+    s.execute("picture.artisticEffect", &json!({"effect": "artisticBlur"})).unwrap();
+    s.execute("picture.reset", &json!({})).unwrap();
+    assert_eq!((fill(&s).media, fill(&s).artistic), (original, None));
+}
diff --git a/crates/model/src/style.rs b/crates/model/src/style.rs
index efb30e48..b067c904 100644
--- a/crates/model/src/style.rs
+++ b/crates/model/src/style.rs
@@ -143,6 +143,18 @@ pub struct PictureFill {
     /// flipped.
     #[serde(skip_serializing_if = "std::ops::Not::not")]
     pub upright: bool,
+    /// An artistic effect (Picture Format ▸ Artistic Effects). `media` is then the processed
+    /// picture; the original is kept to change or remove the effect.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub artistic: Option<Artistic>,
+}
+
+/// An applied artistic effect: its `a14` name (e.g. `artisticBlur`) and the original picture.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Artistic {
+    pub effect: String,
+    pub original: MediaId,
 }
 
 /// Picture corrections and colour (Picture Format ▸ Corrections / Color / Transparency).
diff --git a/crates/pptx/src/read/dml.rs b/crates/pptx/src/read/dml.rs
index 0aee935c..71281c9a 100644
--- a/crates/pptx/src/read/dml.rs
+++ b/crates/pptx/src/read/dml.rs
@@ -126,6 +126,17 @@ pub fn blip_fill(imp: &mut Imp, part: &Part, bf: &El) -> Option<PictureFill> {
     let media = blip.and_then(|b| media_ref(imp, part, b));
     let media = media?;
     let mut pf = PictureFill { media, upright: !bf.bool("rotWithShape").unwrap_or(true), ..Default::default() };
+    if let Some(layer) = blip.and_then(|b| b.child("extLst")).and_then(|x| x.find("imgLayer"))
+        && let Some(effect) = layer
+            .elements()
+            .filter(|e| e.local() == "imgEffect")
+            .flat_map(|e| e.elements())
+            .map(|e| e.local().to_string())
+            .find(|n| n.starts_with("artistic"))
+        && let Some(original) = media_ref(imp, part, layer)
+    {
+        pf.artistic = Some(deckcraft_model::style::Artistic { effect, original });
+    }
     if let Some(b) = blip {
         for e in b.elements() {
             match e.local() {
diff --git a/crates/pptx/src/write/dml.rs b/crates/pptx/src/write/dml.rs
index 16a069fe..4185043d 100644
--- a/crates/pptx/src/write/dml.rs
+++ b/crates/pptx/src/write/dml.rs
@@ -105,7 +105,8 @@ pub fn blip_fill(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, pf: &PictureFil
         || adj.duotone.is_some()
         || adj.clear_color.is_some()
         || adj.bilevel.is_some()
-        || adj.alpha_inv;
+        || adj.alpha_inv
+        || pf.artistic.is_some();
     let a = A::new().a("r:embed", &rid);
     if has_kids {
         w.open("a:blip", a);
@@ -140,6 +141,25 @@ pub fn blip_fill(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, pf: &PictureFil
         if adj.brightness != 0.0 || adj.contrast != 0.0 {
             w.empty("a:lum", A::new().a("bright", pct(adj.brightness.clamp(-1.0, 1.0))).a("contrast", pct(adj.contrast.clamp(-1.0, 1.0))));
         }
+        // Artistic effect: the blip is the processed picture; the original rides in an
+        // `a14:imgLayer` with the effect's name, as PowerPoint writes it.
+        if let Some(art) = &pf.artistic
+            && art.effect.starts_with("artistic")
+            && art.effect.chars().all(|c| c.is_ascii_alphanumeric())
+            && let Some(orig) = x.media_rel(o, art.original, "image")
+        {
+            w.open0("a:extLst");
+            w.open("a:ext", A::new().a("uri", "{BEBA8EAE-BF5A-486C-A8C5-ECC9F3942E4B}"));
+            w.open("a14:imgProps", A::new().a("xmlns:a14", crate::opc::NS_A14));
+            w.open("a14:imgLayer", A::new().a("r:embed", &orig));
+            w.open0("a14:imgEffect");
+            w.empty0(&format!("a14:{}", art.effect));
+            w.close("a14:imgEffect");
+            w.close("a14:imgLayer");
+            w.close("a14:imgProps");
+            w.close("a:ext");
+            w.close("a:extLst");
+        }
         w.close("a:blip");
     } else {
         w.empty("a:blip", a);
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..1f64688b 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -232,6 +232,7 @@ pub fn rich_deck() -> Presentation {
             alpha: Some(0.5),
             adjust: PictureAdjust { brightness: 0.2, contrast: -0.1, grayscale: true, ..Default::default() },
             upright: false,
+            artistic: None,
         },
     };
     let mut tiled = shape(&mut p, "Tiled", 350.0, 120.0, 200.0, 150.0);
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..5b9dc32e 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2076,6 +2076,17 @@ fn picture_format(app: &mut SlideApp, ui: &mut Ui) {
                 run(app, "picture.adjust", json!({"grayscale": true}));
             }
         });
+        let r = big_button(ui, Icon::ArtisticEffects, "Artistic\nEffects", enabled(app, "picture.artisticEffect"));
+        egui::Popup::menu(&r).show(|ui| {
+            if ui.button("None").clicked() {
+                run(app, "picture.artisticEffect", json!({"effect": "none"}));
+            }
+            for (e, l) in deckcraft_engine::cmd::artistic::EFFECTS {
+                if ui.button(*l).clicked() {
+                    run(app, "picture.artisticEffect", json!({"effect": e}));
+                }
+            }
+        });
         let r = big_button(ui, Icon::Transparency, "Transparency", true);
         egui::Popup::menu(&r).show(|ui| {
             for tr in [0.0, 0.15, 0.3, 0.5, 0.65, 0.8, 0.95] {
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..9afa4185 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -185,7 +185,7 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 
 ### Smaller missing rows
 Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
-sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
+sounds (1–2 h), artistic effects (3–6 h for the other 15 of 22; 7 approximated and round-tripped), remove background (6–10 h; needs a model or a classical
 matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
 encryption), ink to shape/text (6–10 h), icons and 3-D models (8–14 h, needs an open icon set).
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Artistic effects: 7 of 22 (blur, pencil grayscale, line drawing, film grain, cutout, glow edges, photocopy) applied, removed and round-tripped (`a14:imgLayer`) |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..65a5d21b 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -182,7 +182,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Pictures | SVG pictures | P1 | M |
 | Pictures | Crop (and crop to shape, aspect ratio) | P0 | P |
 | Pictures | Corrections, colour, transparency | P1 | P |
-| Pictures | Artistic effects | P2 | M |
+| Pictures | Artistic effects | P2 | P |
 | Pictures | Remove background | P2 | M |
 | Pictures | Picture styles and borders | P1 | P |
 | Pictures | Change / reset picture | P1 | D |

From a7bc932cc84b5ffe0de72da6799e3f486f009023 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:38:16 +0300
Subject: [PATCH 159/376] UI: WordArt adjust handles drag a text warp

A selected text warp shows one yellow handle per adjust.
Dragging it sets that guide value in one undo step.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                    |   3 +-
 crates/engine/src/tests.rs    |  40 ++++++++
 crates/engine/src/tools.rs    |  88 +++++++++++++++-
 crates/geom/src/warp.rs       | 188 ++++++++++++++++++++++++++++++++++
 crates/geom/src/warp/tests.rs |  40 ++++++++
 crates/ui-egui/src/canvas.rs  |   6 +-
 docs/gaps.md                  |  16 +--
 docs/roadmap.md               |   5 +-
 docs/target-app-parity.md     |   5 +-
 docs/ui-parity.md             |   4 +-
 10 files changed, 380 insertions(+), 15 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..588977b3 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt adjust handles; previous: hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | WordArt adjust handles: a selected text warp shows one yellow handle per adjust, and dragging it sets that guide value (one undo step) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..31290a11 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,43 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn wordart_adjust_handle_drags_and_undoes() {
+    let mut s = session();
+    s.prefs.snap_to_grid = false;
+    s.prefs.smart_guides = false;
+    let id =
+        s.execute("shape.insert", &json!({"preset": "rect", "rect": [80.0, 60.0, 420.0, 200.0], "text": "ARCHED"})).unwrap()["id"].as_u64().unwrap();
+    let sid = model::ShapeId(id as u32);
+    {
+        let st = s.doc_mut().unwrap();
+        let slide = st.selection.slide;
+        let mut doc = (*st.doc).clone();
+        let sh = model::find_shape_mut(&mut std::sync::Arc::make_mut(&mut doc.slides[slide]).shapes, sid).unwrap();
+        sh.text.as_mut().unwrap().body.warp = Some("textArchUp".into());
+        st.doc = std::sync::Arc::new(doc);
+    }
+    s.execute("edit.select", &json!({"ids": [id]})).unwrap();
+    let (at, top) = {
+        let st = s.doc().unwrap();
+        let sh = st.shape(sid).unwrap();
+        let x = cmd::xfrm_of(&st.doc, &st.selection, sh);
+        let hs = tools::wordart_handles(&st.doc, &st.selection, sh, x.w, x.h);
+        assert_eq!(hs.len(), 1);
+        let at = x.affine() * hs[0].pos;
+        (at, deckcraft_geom::Point::new(x.center().x, x.y))
+    };
+    assert!(matches!(s.hit_test(at, 4.0), Some(tools::Hit::Warp { index: 0, .. })));
+    let ev = |kind, p: deckcraft_geom::Point| PointerEvent { kind, x: p.x, y: p.y, mods: Mods::default(), tol: 4.0 };
+    s.pointer(ev(PointerKind::Down, at)).unwrap();
+    s.pointer(ev(PointerKind::Drag, top)).unwrap();
+    s.pointer(ev(PointerKind::Up, top)).unwrap();
+    let adj = s.doc().unwrap().shape(sid).unwrap().text.as_ref().unwrap().body.warp_adj.clone();
+    let deg = adj.first().copied().unwrap_or(0.0) / 60_000.0;
+    assert!((deg - 270.0).abs() < 2.0, "{deg} from {adj:?}");
+    s.execute("edit.undo", &json!({})).unwrap();
+    let body = &s.doc().unwrap().shape(sid).unwrap().text.as_ref().unwrap().body;
+    assert_eq!(body.warp.as_deref(), Some("textArchUp"));
+    assert!(body.warp_adj.is_empty(), "undo restores the default adjusts");
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..61939c40 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -76,6 +76,11 @@ pub enum Hit {
         id: ShapeId,
         index: usize,
     },
+    /// WordArt warp adjust (yellow handle). `index` is `adj` / `adjN`.
+    Warp {
+        id: ShapeId,
+        index: usize,
+    },
     /// Line end 0/1 of a line-like shape.
     LineEnd {
         id: ShapeId,
@@ -119,6 +124,14 @@ enum Drag {
         index: usize,
         orig: Xfrm,
     },
+    /// WordArt: `base` is the adjust list at mouse-down (empty means the preset defaults).
+    Warp {
+        id: ShapeId,
+        index: usize,
+        name: String,
+        base: Vec<f64>,
+        orig: Xfrm,
+    },
     Marquee {
         start: Point,
         add: bool,
@@ -204,6 +217,45 @@ pub fn box_handles(x: &Xfrm) -> ([Point; 8], Point) {
     (pts, rot)
 }
 
+/// WordArt adjust handles for `sh`, in shape-local points (the text rectangle). Empty when the
+/// resolved body has no warp DeckCraft draws, or the shape has no text to store one on.
+pub fn wordart_handles(
+    doc: &deckcraft_model::Presentation,
+    sel: &crate::Selection,
+    sh: &Shape,
+    w: f64,
+    h: f64,
+) -> Vec<deckcraft_geom::warp::WarpHandle> {
+    if sh.text.is_none() {
+        return Vec::new();
+    }
+    let Some(ctx) = crate::cmd::text::ctx_for(doc, sel) else { return Vec::new() };
+    let bp = deckcraft_model::resolve::body(&ctx, sh);
+    let Some(name) = bp.warp.as_deref().filter(|n| deckcraft_geom::warp::is_supported(n)) else { return Vec::new() };
+    let tr = deckcraft_render::shape_geometry(sh, w, h).text_rect;
+    deckcraft_geom::warp::handles(name, &bp.warp_adj, tr)
+}
+
+/// Write one warp adjust, keeping the others from `base` (empty = the preset defaults).
+fn set_warp_adj(sh: &mut Shape, name: &str, base: &[f64], index: usize, value: f64) {
+    let Some(text) = sh.text.as_mut() else { return };
+    if !value.is_finite() || index > 7 {
+        return;
+    }
+    let defaults = deckcraft_geom::warp::adjust_defaults(name);
+    let n = defaults.len().max(index + 1).min(8);
+    if n == 0 {
+        return;
+    }
+    let mut adj = Vec::with_capacity(n);
+    for i in 0..n {
+        let v = if i == index { value } else { base.get(i).copied().filter(|v| v.is_finite()).or_else(|| defaults.get(i).copied()).unwrap_or(0.0) };
+        adj.push(v);
+    }
+    text.body.warp = Some(name.to_string());
+    text.body.warp_adj = adj;
+}
+
 impl Session {
     pub fn set_tool(&mut self, kind: ToolKind) {
         self.tool.kind = kind;
@@ -239,6 +291,11 @@ impl Session {
                         return Some(Hit::Adjust { id: *id, index: hd.index });
                     }
                 }
+                for hd in wordart_handles(&st.doc, &st.selection, sh, x.w, x.h) {
+                    if (x.affine() * hd.pos - p).hypot() <= tol * 1.6 {
+                        return Some(Hit::Warp { id: *id, index: hd.index });
+                    }
+                }
                 let (pts, rot) = box_handles(&x);
                 if (rot - p).hypot() <= tol * 1.8 && st.selection.text.is_none() {
                     return Some(Hit::Rotate { id: *id });
@@ -370,7 +427,7 @@ impl Session {
         {
             let x = xfrm_of(&st.doc, &st.selection, sh);
             if x.bounds().inflate(tol, tol).contains(p)
-                && !matches!(self.hit_test(p, tol), Some(Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. }))
+                && !matches!(self.hit_test(p, tol), Some(Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. } | Hit::Warp { .. }))
             {
                 let pos = text_pos(st, sh, p);
                 let shift = mods.shift;
@@ -412,6 +469,18 @@ impl Session {
                 self.begin("Adjust Shape");
                 self.tool.drag = Some(Drag::Adjust { id, index, orig });
             }
+            Some(Hit::Warp { id, index }) => {
+                let orig = st.shape(id).map(|s| xfrm_of(&st.doc, &st.selection, s)).unwrap_or_default();
+                let found = st.shape(id).and_then(|sh| {
+                    let ctx = crate::cmd::text::ctx_for(&st.doc, &st.selection)?;
+                    let bp = deckcraft_model::resolve::body(&ctx, sh);
+                    bp.warp.map(|n| (n, bp.warp_adj))
+                });
+                if let Some((name, base)) = found {
+                    self.begin("Adjust WordArt");
+                    self.tool.drag = Some(Drag::Warp { id, index, name, base, orig });
+                }
+            }
             Some(Hit::Shape { id, text }) => {
                 let selected = st.selection.shapes.contains(&id);
                 let toggle = mods.shift || mods.cmd;
@@ -601,6 +670,23 @@ impl Session {
                     Ok(())
                 })?;
             }
+            Drag::Warp { id, index, name, base, orig } => {
+                let v = {
+                    let st = self.doc()?;
+                    let Some(sh) = st.shape(id) else { return Ok(Value::Null) };
+                    let tr = deckcraft_render::shape_geometry(sh, orig.w, orig.h).text_rect;
+                    let hs = deckcraft_geom::warp::handles(&name, &base, tr);
+                    let Some(h) = hs.iter().find(|h| h.index == index) else { return Ok(Value::Null) };
+                    h.value_at(orig.affine().inverse() * p)
+                };
+                self.edit(|doc, sel| {
+                    let list = crate::shapes_mut(doc, sel).ok_or_else(|| cmd::bad("adjust", "no slide"))?;
+                    if let Some(sh) = deckcraft_model::find_shape_mut(list, id) {
+                        set_warp_adj(sh, &name, &base, index, v);
+                    }
+                    Ok(())
+                })?;
+            }
             Drag::Marquee { start, .. } => {
                 self.tool.marquee = Some(Rect::from_points(start, p));
             }
diff --git a/crates/geom/src/warp.rs b/crates/geom/src/warp.rs
index acdee999..25eb104f 100644
--- a/crates/geom/src/warp.rs
+++ b/crates/geom/src/warp.rs
@@ -234,6 +234,194 @@ pub fn is_supported(name: &str) -> bool {
     !adjust_defaults(name).is_empty()
 }
 
+/// A yellow adjust handle for one warp guide value. `pos` is in the same space as `rect`
+/// (shape-local points). Dragging projects the pointer onto the handle's axis, or around the
+/// text rectangle's centre for an angle.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct WarpHandle {
+    pub index: usize,
+    pub pos: Point,
+    kind: HandleKind,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+enum HandleKind {
+    /// `pos = origin + dir * raw`. `value_at` projects onto that line and clamps.
+    Line { origin: Point, dir: Vec2, min: f64, max: f64 },
+    /// Angle about `center` (y down, 0° at +x). `invert` is arch-down, whose guide angle is `180° − adj`.
+    Angle { center: Point, invert: bool },
+}
+
+impl WarpHandle {
+    /// The raw guide value (`adj` / `adjN`) for a pointer at `p`.
+    pub fn value_at(&self, p: Point) -> f64 {
+        match self.kind {
+            HandleKind::Line { origin, dir, min, max } => {
+                let l2 = dir.hypot2();
+                if l2 < 1e-18 || !(p.x.is_finite() && p.y.is_finite()) {
+                    return min;
+                }
+                let v = (p - origin).dot(dir) / l2;
+                if !v.is_finite() {
+                    return min;
+                }
+                let (lo, hi) = (min.min(max), max.max(min));
+                v.clamp(lo, hi).round()
+            }
+            HandleKind::Angle { center, invert } => {
+                let d = p - center;
+                if !(d.x.is_finite() && d.y.is_finite()) || d.hypot() < 1e-9 {
+                    return 0.0;
+                }
+                let mut deg = d.y.atan2(d.x).to_degrees();
+                if invert {
+                    deg = 180.0 - deg;
+                }
+                (deg.rem_euclid(360.0) * 60_000.0).round()
+            }
+        }
+    }
+}
+
+fn stored_raw(adj: &[f64], defaults: &[f64], i: usize) -> f64 {
+    adj.get(i).copied().filter(|v| v.is_finite()).or_else(|| defaults.get(i).copied()).unwrap_or(0.0)
+}
+
+fn unit(rect: Rect, u: f64, v: f64) -> Point {
+    Point::new(rect.x0 + u * rect.width(), rect.y0 + v * rect.height())
+}
+
+/// A fraction handle: unit position `(x, sign * frac)`, raw = frac × 100 000, clamped to `lo..=hi`.
+fn frac_handle(rect: Rect, index: usize, x: f64, frac: f64, lo: f64, hi: f64, sign: f64) -> WarpHandle {
+    let frac = frac.clamp(lo, hi);
+    WarpHandle {
+        index,
+        pos: unit(rect, x, sign * frac),
+        kind: HandleKind::Line {
+            origin: unit(rect, x, 0.0),
+            dir: Vec2::new(0.0, sign * rect.height() / 100_000.0),
+            min: lo * 100_000.0,
+            max: hi * 100_000.0,
+        },
+    }
+}
+
+/// A fraction handle that slides horizontally: unit `(frac, y)`.
+fn frac_x_handle(rect: Rect, index: usize, y: f64, frac: f64, lo: f64, hi: f64) -> WarpHandle {
+    let frac = frac.clamp(lo, hi);
+    WarpHandle {
+        index,
+        pos: unit(rect, frac, y),
+        kind: HandleKind::Line {
+            origin: unit(rect, 0.0, y),
+            dir: Vec2::new(rect.width() / 100_000.0, 0.0),
+            min: lo * 100_000.0,
+            max: hi * 100_000.0,
+        },
+    }
+}
+
+/// Angle handle, inset from the ellipse so it doesn't sit on a resize handle.
+fn angle_handle(rect: Rect, index: usize, deg: f64, invert: bool) -> WarpHandle {
+    let geom = if invert { 180.0 - deg } else { deg };
+    let rad = geom.to_radians();
+    let c = rect.center();
+    WarpHandle {
+        index,
+        pos: Point::new(c.x + rect.width() * 0.36 * rad.cos(), c.y + rect.height() * 0.36 * rad.sin()),
+        kind: HandleKind::Angle { center: c, invert },
+    }
+}
+
+/// Inner-ellipse radius (pour presets): the handle sits on the downward point of that ellipse.
+fn radius_handle(rect: Rect, r: f64) -> WarpHandle {
+    let r = r.clamp(0.0, 0.99);
+    WarpHandle {
+        index: 1,
+        pos: unit(rect, 0.5, 0.5 + 0.5 * r),
+        kind: HandleKind::Line { origin: unit(rect, 0.5, 0.5), dir: Vec2::new(0.0, 0.5 * rect.height() / 100_000.0), min: 0.0, max: 99_000.0 },
+    }
+}
+
+/// Wave phase: slides sideways around the middle of the lower half.
+fn shift_handle(rect: Rect, s: f64) -> WarpHandle {
+    let s = s.clamp(-0.1, 0.1);
+    WarpHandle {
+        index: 1,
+        pos: unit(rect, 0.5 + s, 0.78),
+        kind: HandleKind::Line { origin: unit(rect, 0.5, 0.78), dir: Vec2::new(rect.width() / 100_000.0, 0.0), min: -10_000.0, max: 10_000.0 },
+    }
+}
+
+/// Yellow handles for warp `name` over text rectangle `rect`. Empty when `name` isn't a drawn
+/// preset or `rect` isn't a usable box. Missing adjust values take the preset defaults.
+pub fn handles(name: &str, adj: &[f64], rect: Rect) -> Vec<WarpHandle> {
+    if ![rect.x0, rect.y0, rect.x1, rect.y1].iter().all(|v| v.is_finite()) {
+        return Vec::new();
+    }
+    let rect = Rect::new(rect.x0.min(rect.x1), rect.y0.min(rect.y1), rect.x0.max(rect.x1), rect.y0.max(rect.y1));
+    if rect.width() < 1e-3 || rect.height() < 1e-3 {
+        return Vec::new();
+    }
+    let defaults = adjust_defaults(name);
+    if defaults.is_empty() {
+        return Vec::new();
+    }
+    let raw = |i| stored_raw(adj, defaults, i);
+    let frac = |i| raw(i) / 100_000.0;
+    let deg = |i| (raw(i) / 60_000.0).rem_euclid(360.0);
+    let y = |out: &mut Vec<WarpHandle>, x, lo, hi, sign| out.push(frac_handle(rect, 0, x, frac(0), lo, hi, sign));
+    let xh = |out: &mut Vec<WarpHandle>, yy, lo, hi| out.push(frac_x_handle(rect, 0, yy, frac(0), lo, hi));
+    let mut out = Vec::with_capacity(defaults.len());
+    match name {
+        "textPlain" => xh(&mut out, 0.28, 0.3, 0.7),
+        "textStop" => y(&mut out, 0.5, 0.14286, 0.5, 1.0),
+        "textTriangle" | "textTriangleInverted" => y(&mut out, 0.18, 0.0, 1.0, 1.0),
+        "textChevron" => y(&mut out, 0.18, 0.0, 0.5, 1.0),
+        "textChevronInverted" => y(&mut out, 0.18, 0.5, 1.0, 1.0),
+        "textFadeRight" => y(&mut out, 0.82, 0.0, 0.49999, 1.0),
+        "textFadeLeft" => y(&mut out, 0.18, 0.0, 0.49999, 1.0),
+        "textFadeUp" => xh(&mut out, 0.22, 0.0, 0.49999),
+        "textFadeDown" => xh(&mut out, 0.78, 0.0, 0.49999),
+        "textSlantUp" => y(&mut out, 0.18, 0.44444, 1.0, 1.0),
+        "textSlantDown" => y(&mut out, 0.18, 0.0, 0.55556, 1.0),
+        "textCascadeUp" => y(&mut out, 0.82, 0.0, 1.0, 1.0),
+        "textCascadeDown" => y(&mut out, 0.18, 0.0, 1.0, 1.0),
+        "textInflate" => y(&mut out, 0.62, 0.0, 0.2, -1.0),
+        "textDeflate" => y(&mut out, 0.62, 0.0, 0.375, 1.0),
+        "textInflateBottom" => y(&mut out, 0.62, 0.6, 1.0, 1.0),
+        "textDeflateBottom" => y(&mut out, 0.62, 0.0625, 1.0, 1.0),
+        "textInflateTop" => y(&mut out, 0.62, 0.0, 0.5, 1.0),
+        "textDeflateTop" => y(&mut out, 0.62, 0.0, 0.9375, 1.0),
+        "textDeflateInflate" => y(&mut out, 0.5, 0.05, 0.95, 1.0),
+        "textDeflateInflateDeflate" => y(&mut out, 0.5, 0.01, 1.0 / 3.0, 1.0),
+        "textCurveUp" | "textCurveDown" => y(&mut out, 0.18, 0.0, 0.56818, 1.0),
+        "textCanUp" => y(&mut out, 0.62, 0.5, 1.0, 1.0),
+        "textCanDown" => y(&mut out, 0.62, 0.0, 0.5, 1.0),
+        "textRingInside" | "textRingOutside" => y(&mut out, 0.5, 0.5, 0.99, 1.0),
+        "textArchUp" | "textCircle" | "textButton" => out.push(angle_handle(rect, 0, deg(0), false)),
+        "textArchDown" => out.push(angle_handle(rect, 0, deg(0), true)),
+        "textArchUpPour" | "textCirclePour" | "textButtonPour" => {
+            out.push(angle_handle(rect, 0, deg(0), false));
+            out.push(radius_handle(rect, frac(1)));
+        }
+        "textArchDownPour" => {
+            out.push(angle_handle(rect, 0, deg(0), true));
+            out.push(radius_handle(rect, frac(1)));
+        }
+        "textWave1" | "textWave2" => {
+            y(&mut out, 0.32, 0.0, 0.2, 1.0);
+            out.push(shift_handle(rect, frac(1)));
+        }
+        "textDoubleWave1" | "textWave4" => {
+            y(&mut out, 0.32, 0.0, 0.125, 1.0);
+            out.push(shift_handle(rect, frac(1)));
+        }
+        _ => return Vec::new(),
+    }
+    out
+}
+
 /// Segments of a guide in unit coordinates (x, y in 0..1 over the text rectangle).
 #[derive(Clone, Copy, Debug)]
 enum Seg {
diff --git a/crates/geom/src/warp/tests.rs b/crates/geom/src/warp/tests.rs
index 2d18b13a..2d56d210 100644
--- a/crates/geom/src/warp/tests.rs
+++ b/crates/geom/src/warp/tests.rs
@@ -307,3 +307,43 @@ fn hostile_adjusts_and_boxes_stay_finite() {
     }
     assert!(warp("textPlain", &[], Rect::new(f64::NAN, 0.0, 1.0, 1.0)).is_none());
 }
+
+#[test]
+fn every_preset_has_one_handle_per_adjust() {
+    let r = rect();
+    for name in ALL {
+        let hs = handles(name, &[], r);
+        assert_eq!(hs.len(), adjust_count(name), "{name}");
+        let defaults = adjust_defaults(name);
+        for h in &hs {
+            assert!(h.pos.x.is_finite() && h.pos.y.is_finite(), "{name}");
+            let back = h.value_at(h.pos);
+            let want = defaults[h.index];
+            assert!((back - want).abs() <= 1.0, "{name} handle {}: {back} vs {want}", h.index);
+        }
+    }
+    assert!(handles("textNoShape", &[], r).is_empty());
+    assert!(handles("textArchUp", &[], Rect::new(0.0, 0.0, f64::NAN, 10.0)).is_empty());
+    assert!(handles("textArchUp", &[], Rect::new(0.0, 0.0, 0.0, 0.0)).is_empty());
+    // A hostile adjust still places a finite handle on the clamped default.
+    let hs = handles("textInflate", &[f64::NAN], r);
+    assert_eq!(hs.len(), 1);
+    assert!(hs[0].pos.x.is_finite() && hs[0].pos.y.is_finite());
+}
+
+#[test]
+fn arch_and_inflate_handles_follow_the_pointer() {
+    let r = rect();
+    let arch = &handles("textArchUp", &[], r)[0];
+    let deg = arch.value_at(Point::new(r.center().x, r.y0)) / 60_000.0;
+    assert!((deg - 270.0).abs() < 0.5, "{deg}");
+    let down = &handles("textArchDown", &[], r)[0];
+    // The arch-down handle starts on the left; a pointer at the bottom is 90°, which is adjust 90
+    // (guide angle 180 − adj).
+    let deg = down.value_at(Point::new(r.center().x, r.y1)) / 60_000.0;
+    assert!((deg - 90.0).abs() < 0.5, "{deg}");
+    let inf = &handles("textInflate", &[], r)[0];
+    let more = inf.value_at(Point::new(inf.pos.x, r.y0 - 80.0));
+    assert!(more > adjust_defaults("textInflate")[0], "{more}");
+    assert!((more - 20_000.0).abs() < 1.0, "{more}");
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..ed86f6d1 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -404,7 +404,7 @@ fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
             _ => egui::CursorIcon::ResizeHorizontal,
         },
         (_, Some(Hit::Rotate { .. })) => egui::CursorIcon::Alias,
-        (_, Some(Hit::Adjust { .. } | Hit::LineEnd { .. })) => egui::CursorIcon::PointingHand,
+        (_, Some(Hit::Adjust { .. } | Hit::Warp { .. } | Hit::LineEnd { .. })) => egui::CursorIcon::PointingHand,
         (_, Some(Hit::Shape { text: true, .. })) => {
             if app.session.active().is_some_and(|d| d.selection.text.is_some()) {
                 egui::CursorIcon::Text
@@ -484,6 +484,10 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
                 let q = xf.to_screen(a * hd.pos);
                 painter.circle(q, 4.5, Color32::from_rgb(0xFF, 0xD2, 0x3F), Stroke::new(1.0, Color32::from_rgb(0x8A, 0x6A, 0x00)));
             }
+            for hd in deckcraft_engine::tools::wordart_handles(&st.doc, &st.selection, sh, x.w, x.h) {
+                let q = xf.to_screen(a * hd.pos);
+                painter.circle(q, 4.5, Color32::from_rgb(0xFF, 0xD2, 0x3F), Stroke::new(1.0, Color32::from_rgb(0x8A, 0x6A, 0x00)));
+            }
         }
     }
     // Caret / text selection.
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..7459dbe1 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt adjust handles drag; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -166,12 +166,13 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 
 ### Edit points, text warp, 3-D
 - **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
-  `prstTxWarp` presets render and their adjusts round-trip, but there is no Transform gallery or
-  command to apply one, no adjust handles, and arc/circle placement can differ from PowerPoint by
-  1–3 % of the path length), "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting
-  render as approximations and `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces,
-  only the three-point rig, and no command or pane to apply 3-D).
-- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
+  `prstTxWarp` presets render, their adjusts round-trip, and a selected warp shows a yellow handle
+  per adjust that dragging sets; still no Transform gallery or command to apply one, and arc/circle
+  placement can differ from PowerPoint by 1–3 % of the path length), "Bevel and 3-D rotation"
+  (partial: bevels, camera presets and rotations and face lighting render as approximations and
+  `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces, only the three-point rig, and
+  no command or pane to apply 3-D).
+- **Estimate:** 4–6 h (edit points), 1–2 h (Transform gallery and command), 6–10 h (3-D extrusion,
   rigs and materials, Format Shape page).
 
 ### Proofing: spelling, thesaurus, AutoCorrect
@@ -256,6 +257,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | WordArt adjust handles: a selected text warp shows one yellow handle per adjust, and dragging it sets that guide value (gallery and command still open) |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..5a766343 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (M9 text warps: adjust handles drag; gallery and command remain) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -79,7 +79,7 @@ From the local execution plan (`plan/execution-plan.md`, gitignored). Status as
 | M6 | Transitions and animations | mostly | Animation Pane timeline, remaining effects, transition sounds |
 | M7 | Slide show | mostly | second-display placement, laser, record |
 | M8 | Tables and charts | partly | chart data grid, elements, chartex types, draw table |
-| M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), text warps |
+| M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), warp gallery and command |
 | M10 | Views | done | grid options, New Window |
 | M11 | Output | partly | vector PDF, SVG, GIF, MP4, print |
 | M12 | Review | partly | dictionaries, AutoCorrect, find/replace dialog, compare |
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | M9: WordArt adjust handles drag; the Transform gallery and command stay open |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..65e12820 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (text-warp shortfall is the gallery and command; adjust handles drag) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -184,7 +184,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Slides and sections | 6 | 90% | ~85% | 3–5 | Zoom (summary/section/slide), copying slides between decks keeps formatting only partly | [parity-checklist.md](parity-checklist.md) |
 | Views | 4 | 90% | ~80% | 3–6 | Snap to grid and grid options, New Window | [ui-parity.md](ui-parity.md) |
 | Masters and themes | 7 | 85% | ~70% | 8–14 | Notes and Handout masters, theme variants, `.thmx`, effect schemes | [parity-checklist.md](parity-checklist.md) |
-| Shapes | 7 | 86% | ~75% | 8–14 | Edit points, text warp, WordArt depth | [ui-parity.md](ui-parity.md) |
+| Shapes | 7 | 86% | ~75% | 8–14 | Edit points, warp gallery and command, WordArt depth | [ui-parity.md](ui-parity.md) |
 | Format (fill, line, effects) | 6 | 81% | ~65% | 8–14 | Format Shape pane depth, bevel and 3-D, picture/texture fill options | [ui-parity.md](ui-parity.md) |
 | Arrange | 3 | 100% | ~90% | 1–2 | Align to slide vs selected as a menu choice, More Rotation Options | [ui-parity.md](ui-parity.md) |
 | Text | 15 | 80% | ~62% | 18–30 | Font weights beyond Regular/Bold/Italic (#69), Tab in text boxes (#78), IME, true vertical CJK, dictionaries, AutoCorrect, thesaurus, equations (PR #55 open) | [localization-parity.md](localization-parity.md) |
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Shapes shortfall "text warp" narrowed: yellow adjust handles drag; the gallery and command remain |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..83f4a455 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt adjust handles; previous: File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -79,6 +79,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Shift-constrained move, Option-drag to duplicate | yes | yes |
 | Connector glue and rerouting | yes | yes |
 | Edit points on freeforms | yes | **no** |
+| WordArt adjust handles | yellow handles on transformed text | yes, one per adjust when the text has a warp; dragging sets that guide value |
 | Crop handles, crop to shape, aspect ratio | yes | partial |
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
 | Exact size/position, lock aspect | yes | yes |
@@ -148,6 +149,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | WordArt adjust handles on a selected text warp; dragging one sets that `prstTxWarp` adjust |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 5007c6919e6f8702cdc60d2b684960787c0f7bcd Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:40:37 +0300
Subject: [PATCH 160/376] Insert: Summary, Section and Slide Zoom with Return
 to Zoom
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Insert › Links gains Zoom, with PowerPoint's three kinds: Slide Zoom
(pictures of chosen slides on the current slide), Section Zoom (one per
chosen section) and Summary Zoom (a new Title Only slide in front of
the chosen parts). Each zoom is a picture of its target that jumps to
it in the show. With Return to Zoom, on by default for section and
summary zooms as in PowerPoint, the show comes back to the zoom slide,
fully built, after the target slide or the section's last slide; going
elsewhere (a slide number, See All Slides) forgets it. Hyperlink gains
zoom_return for this; .pptx saves zooms as the linked pictures
PowerPoint writes as their fallback, so the return flag is DeckCraft-
only for now. Live thumbnails, the zoom-in animation and the native
p166:sldZm element are still missing; gaps.md says so.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/anim/src/show.rs         |  28 ++++-
 crates/anim/src/tests.rs        |  30 +++++
 crates/engine/src/cmd/insert.rs |   4 +-
 crates/engine/src/cmd/mod.rs    |   2 +
 crates/engine/src/cmd/zoom.rs   | 188 ++++++++++++++++++++++++++++++++
 crates/model/src/tests.rs       |   9 +-
 crates/model/src/text.rs        |   4 +
 crates/pptx/src/read/dml.rs     |   7 +-
 crates/pptx/src/write/shapes.rs |   1 +
 crates/pptx/tests/roundtrip.rs  |  64 ++++++++++-
 crates/render/src/tests.rs      |   7 +-
 crates/ui-egui/src/ribbon.rs    |  60 ++++++++++
 crates/ui-egui/src/show.rs      |   2 +-
 docs/gaps.md                    |   2 +-
 docs/parity-checklist.md        |   2 +-
 15 files changed, 398 insertions(+), 12 deletions(-)
 create mode 100644 crates/engine/src/cmd/zoom.rs

diff --git a/crates/anim/src/show.rs b/crates/anim/src/show.rs
index dbc0a8ae..2d18affd 100644
--- a/crates/anim/src/show.rs
+++ b/crates/anim/src/show.rs
@@ -2,7 +2,7 @@
 //! and automatic advance.
 
 use deckcraft_model::Presentation;
-use deckcraft_model::text::Action;
+use deckcraft_model::text::{Action, Hyperlink};
 
 use crate::Timeline;
 
@@ -63,6 +63,9 @@ pub struct ShowState {
     pub playing: bool,
     /// On the end screen.
     pub ended: bool,
+    /// Return to Zoom: (zoom slide, last zoomed slide). Advancing past the last zoomed slide goes
+    /// back to the zoom slide, fully built.
+    pub zoom: Option<(usize, usize)>,
 }
 
 /// Slide indices the show visits in order: the custom show or range from Set Up Slide Show, minus
@@ -160,6 +163,16 @@ impl ShowState {
             self.playing = true;
             return ShowAction::PlayStep(self.step);
         }
+        if let Some((back, until)) = self.zoom
+            && until == self.slide
+            && back < pres.slides.len()
+        {
+            self.zoom = None;
+            self.enter(pres, back);
+            self.step = ShowState::steps(pres, back);
+            self.playing = false;
+            return ShowAction::Slide(back);
+        }
         match self.next_index(pres) {
             Some(i) => {
                 self.enter(pres, i);
@@ -234,6 +247,7 @@ impl ShowState {
         if i >= pres.slides.len() {
             return ShowAction::None;
         }
+        self.zoom = None;
         self.enter(pres, i);
         ShowAction::Slide(i)
     }
@@ -259,6 +273,18 @@ impl ShowState {
         }
     }
 
+    /// Follow a clicked link, honouring a zoom's Return to Zoom (see [`Hyperlink::zoom_return`]).
+    pub fn follow_link(&mut self, pres: &Presentation, link: &Hyperlink, last_viewed: Option<usize>) -> LinkJump {
+        let from = self.slide;
+        let jump = self.follow(pres, &link.action, last_viewed);
+        if let Some(until) = link.zoom_return.and_then(|id| pres.slides.iter().position(|s| s.id == id))
+            && matches!(jump, LinkJump::Show(ShowAction::Slide(_)))
+        {
+            self.zoom = Some((from, until));
+        }
+        jump
+    }
+
     /// Seconds after which the current slide advances by itself (Advance Slide ▸ After), when the
     /// show uses timings.
     pub fn advance_after(&self, pres: &Presentation) -> Option<f64> {
diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..b62f77d5 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -789,3 +789,33 @@ fn show_follows_links() {
     assert_eq!(s.follow(&p, &Action::LastViewed, None), LinkJump::None);
     assert_eq!(s.slide, 3);
 }
+
+/// Zoom with Return to Zoom: after the zoomed slides the show goes back to the zoom slide, fully
+/// built; without it, or after jumping elsewhere, the show carries on in order.
+#[test]
+fn show_returns_to_the_zoom_slide() {
+    use deckcraft_model::text::{Action, Hyperlink};
+    let p = pres(6);
+    let link = |to: u32, last: Option<u32>| Hyperlink {
+        action: Action::Slide { slide: SlideId(1000 + to) },
+        tooltip: String::new(),
+        highlight_click: false,
+        zoom_return: last.map(|l| SlideId(1000 + l)),
+    };
+    let mut s = ShowState::new(&p);
+    // A section zoom on slide 0 for slides 2–3.
+    assert_eq!(s.follow_link(&p, &link(2, Some(3)), None), LinkJump::Show(ShowAction::Slide(2)));
+    assert_eq!(s.next(&p), ShowAction::Slide(3));
+    assert_eq!(s.next(&p), ShowAction::Slide(0), "back to the zoom");
+    assert_eq!(s.step, ShowState::steps(&p, 0));
+    assert_eq!(s.next(&p), ShowAction::Slide(1), "then on in order");
+    // Without Return to Zoom the show carries on.
+    let mut s = ShowState::new(&p);
+    s.follow_link(&p, &link(4, None), None);
+    assert_eq!(s.next(&p), ShowAction::Slide(5));
+    // Jumping elsewhere (See All Slides, a number) forgets the zoom.
+    let mut s = ShowState::new(&p);
+    s.follow_link(&p, &link(2, Some(2)), None);
+    s.goto(&p, 4);
+    assert_eq!(s.next(&p), ShowAction::Slide(5));
+}
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..432131bb 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -589,7 +589,7 @@ fn hyperlink(s: &mut Session, p: &Value) -> Result<Value> {
         return Err(bad("insert.hyperlink", "missing `url` or `slide`"));
     };
     let display = str_param(p, "text").map_or(display, str::to_string);
-    let link = Hyperlink { action, tooltip: str_param(p, "tooltip").unwrap_or("").to_string(), highlight_click: false };
+    let link = Hyperlink { action, tooltip: str_param(p, "tooltip").unwrap_or("").to_string(), highlight_click: false, zoom_return: None };
     if s.doc()?.selection.text.is_some() {
         return super::text::link_text(s, link, &display);
     }
@@ -621,7 +621,7 @@ fn action_button(s: &mut Session, p: &Value) -> Result<Value> {
         xfrm: Some(rect),
         geom: Geom::preset(preset),
         style: Some(ShapeStyle::accent(SchemeSlot::Accent1)),
-        click: action.map(|a| Hyperlink { action: a, tooltip: String::new(), highlight_click: true }),
+        click: action.map(|a| Hyperlink { action: a, tooltip: String::new(), highlight_click: true, zoom_return: None }),
         ..Default::default()
     };
     let id = add_shape(s, shape, true)?;
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..337ccea4 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -17,6 +17,7 @@ pub mod slide;
 pub mod table;
 pub mod text;
 pub mod transition;
+pub mod zoom;
 
 use deckcraft_geom::Xfrm;
 use deckcraft_model::ShapeId;
@@ -142,6 +143,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(review::specs());
         v.extend(inspect::specs());
         v.extend(media::specs());
+        v.extend(zoom::specs());
         v
     })
 }
diff --git a/crates/engine/src/cmd/zoom.rs b/crates/engine/src/cmd/zoom.rs
new file mode 100644
index 00000000..0b7abf9d
--- /dev/null
+++ b/crates/engine/src/cmd/zoom.rs
@@ -0,0 +1,188 @@
+//! Insert ▸ Zoom: Summary Zoom, Section Zoom and Slide Zoom.
+//!
+//! A zoom is a picture of the target slide that jumps to it in the slide show. With Return to
+//! Zoom (on for summary and section zooms, as in PowerPoint) the show comes back to the zoom
+//! slide after the target slide, or the target section's last slide. In .pptx a zoom is saved as
+//! the linked picture PowerPoint itself writes as the fallback for older versions.
+
+use std::sync::Arc;
+
+use deckcraft_geom::Xfrm;
+use deckcraft_model::style::PictureFill;
+use deckcraft_model::text::{Action, Hyperlink, TextBody};
+use deckcraft_model::{LayoutType, Shape, ShapeId, ShapeKind, SlideId, defaults};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![cmd!(
+        "insert.zoom",
+        "Zoom",
+        ["Insert", "Links"],
+        None,
+        "{kind?: slide|section|summary (default slide); slides?: [index] (slide and summary zooms); sections?: [index] (section zoom); returnToZoom?: bool (default: on for section and summary, off for slide)}",
+        has_slide,
+        zoom
+    )]
+}
+
+/// One zoom tile: the slide it shows and jumps to, and the slide after which the show returns.
+struct Target {
+    slide: SlideId,
+    index: usize,
+    last: SlideId,
+}
+
+/// `n` tiles of `aspect` (w / h) laid out in a centred grid inside `area`.
+fn grid(n: usize, area: Xfrm, aspect: f64) -> Vec<Xfrm> {
+    let cols = (n as f64).sqrt().ceil().max(1.0) as usize;
+    let rows = n.div_ceil(cols).max(1);
+    let gap = 12.0;
+    let cw = (area.w - gap * (cols as f64 - 1.0)) / cols as f64;
+    let ch = (area.h - gap * (rows as f64 - 1.0)) / rows as f64;
+    let (w, h) = if cw / ch > aspect { (ch * aspect, ch) } else { (cw, cw / aspect) };
+    // A single slide zoom is a quarter of the slide wide, as PowerPoint inserts it.
+    let (w, h) = if n == 1 { (w.min(area.w / 2.0), h.min(area.w / 2.0 / aspect)) } else { (w, h) };
+    let total_w = cols.min(n) as f64 * w + gap * (cols.min(n) as f64 - 1.0);
+    let total_h = rows as f64 * h + gap * (rows as f64 - 1.0);
+    let (x0, y0) = (area.x + (area.w - total_w) / 2.0, area.y + (area.h - total_h) / 2.0);
+    (0..n).map(|k| Xfrm::new(x0 + (k % cols) as f64 * (w + gap), y0 + (k / cols) as f64 * (h + gap), w, h)).collect()
+}
+
+fn indices(p: &Value, key: &str, n: usize, what: &str) -> Result<Vec<usize>> {
+    let Some(Value::Array(a)) = p.get(key) else { return Ok(vec![]) };
+    let mut v = vec![];
+    for x in a {
+        let i = x
+            .as_u64()
+            .map(|i| i as usize)
+            .filter(|i| *i < n)
+            .ok_or_else(|| bad("insert.zoom", format!("there is no {what} {x} (indices count from 0)")))?;
+        if !v.contains(&i) {
+            v.push(i);
+        }
+    }
+    Ok(v)
+}
+
+fn zoom(s: &mut Session, p: &Value) -> Result<Value> {
+    let kind = str_param(p, "kind").unwrap_or("slide");
+    let st = s.doc()?;
+    let doc = &st.doc;
+    let n = doc.slides.len();
+    let targets: Vec<Target> = match kind {
+        "slide" => {
+            indices(p, "slides", n, "slide")?.into_iter().map(|i| Target { slide: doc.slides[i].id, index: i, last: doc.slides[i].id }).collect()
+        }
+        "section" => {
+            let secs = indices(p, "sections", doc.sections.len(), "section")?;
+            secs.into_iter()
+                .filter_map(|k| {
+                    let sec = &doc.sections[k];
+                    let first = *sec.slides.first()?;
+                    let last = *sec.slides.last()?;
+                    Some(Target { slide: first, index: doc.slide_index(first)?, last })
+                })
+                .collect()
+        }
+        "summary" => {
+            let mut starts = indices(p, "slides", n, "slide")?;
+            if starts.is_empty() {
+                // Default: the first slide of every section, or every slide's start when there are none.
+                starts = doc.sections.iter().filter_map(|sec| sec.slides.first().and_then(|id| doc.slide_index(*id))).collect();
+            }
+            starts.sort_unstable();
+            starts
+                .iter()
+                .enumerate()
+                .map(|(k, &i)| {
+                    // Each part runs to the slide before the next part (or the end).
+                    let end = starts.get(k + 1).map(|j| j.saturating_sub(1)).unwrap_or(n.saturating_sub(1)).max(i);
+                    Target { slide: doc.slides[i].id, index: i, last: doc.slides[end].id }
+                })
+                .collect()
+        }
+        other => return Err(bad("insert.zoom", format!("unknown zoom kind `{other}` (slide, section or summary)"))),
+    };
+    if targets.is_empty() {
+        return Err(bad("insert.zoom", "choose the slides (or sections) to zoom to"));
+    }
+    let back = bool_or(p, "returnToZoom", kind != "slide");
+    let size = doc.slide_size;
+    // Pictures of the targets, about 480 px wide.
+    let scale = (480.0 / size.width.max(1.0)).clamp(0.05, 4.0);
+    let pictures: Vec<(Vec<u8>, String)> = targets
+        .iter()
+        .map(|t| {
+            let (png, _, _) = super::file::render_png(doc, t.index, scale, false);
+            let title = doc.slides[t.index].title();
+            let label =
+                if title.trim().is_empty() { format!("Slide {}", t.index + 1) } else { title.lines().next().unwrap_or("").trim().to_string() };
+            (png, label)
+        })
+        .collect();
+    let summary = kind == "summary";
+    let first_target = targets.iter().map(|t| t.index).min().unwrap_or(0);
+    s.edit(|doc, sel| {
+        let aspect = size.width / size.height.max(1.0);
+        let area = if summary {
+            Xfrm::new(size.width * 0.06, size.height * 0.26, size.width * 0.88, size.height * 0.66)
+        } else if targets.len() == 1 {
+            Xfrm::new(size.width * 0.5, size.height * 0.5, size.width * 0.45, size.height * 0.45)
+        } else {
+            Xfrm::new(size.width * 0.08, size.height * 0.12, size.width * 0.84, size.height * 0.8)
+        };
+        let boxes = grid(targets.len(), area, aspect);
+        let mut shapes = vec![];
+        for ((t, (png, label)), b) in targets.iter().zip(pictures).zip(boxes) {
+            let media = doc.add_media(&format!("zoom-{}.png", t.index + 1), "image/png", png);
+            shapes.push(Shape {
+                id: ShapeId(doc.alloc_id()),
+                name: format!(
+                    "{} Zoom {}",
+                    if summary {
+                        "Summary"
+                    } else if kind == "section" {
+                        "Section"
+                    } else {
+                        "Slide"
+                    },
+                    t.index + 1
+                ),
+                descr: label.clone(),
+                xfrm: Some(b),
+                kind: ShapeKind::Picture { fill: PictureFill { media, ..Default::default() } },
+                click: Some(Hyperlink {
+                    action: Action::Slide { slide: t.slide },
+                    tooltip: label,
+                    highlight_click: false,
+                    zoom_return: back.then_some(t.last),
+                }),
+                ..Default::default()
+            });
+        }
+        let ids: Vec<ShapeId> = shapes.iter().map(|x| x.id).collect();
+        if summary {
+            // A new Title Only slide before the first part, as PowerPoint makes it.
+            let layout =
+                defaults::layout_of_kind(doc, LayoutType::TitleOnly).or_else(|| doc.slides.get(first_target).map(|x| x.layout)).unwrap_or_default();
+            let mut slide = defaults::new_slide(doc, layout);
+            if let Some(sh) = slide.shapes.iter_mut().find(|x| x.ph_type().is_some_and(|k| k.is_title())) {
+                sh.text = Some(TextBody::from_text("Summary"));
+            }
+            slide.shapes.extend(shapes);
+            let at = first_target.min(doc.slides.len());
+            doc.slides.insert(at, Arc::new(slide));
+            sel.slide = at;
+            sel.slides.clear();
+        } else {
+            let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("insert.zoom", "no slide"))?;
+            list.extend(shapes);
+        }
+        sel.shapes = ids.clone();
+        sel.text = None;
+        Ok(json!({"kind": kind, "ids": ids, "returnToZoom": back, "slide": sel.slide}))
+    })
+}
diff --git a/crates/model/src/tests.rs b/crates/model/src/tests.rs
index 2c3b4ced..3dd062c2 100644
--- a/crates/model/src/tests.rs
+++ b/crates/model/src/tests.rs
@@ -165,7 +165,12 @@ fn hyperlinked_runs_take_the_theme_hyperlink_look() {
     let ctx = Ctx::for_slide(&p, s).unwrap();
     let title = &s.shapes[0];
     let para = Paragraph::default();
-    let link = Some(Hyperlink { action: Action::Url { url: "https://example.org".into() }, tooltip: String::new(), highlight_click: false });
+    let link = Some(Hyperlink {
+        action: Action::Url { url: "https://example.org".into() },
+        tooltip: String::new(),
+        highlight_click: false,
+        zoom_return: None,
+    });
     let hlink = Some(Fill::solid(ColorRef::scheme(SchemeSlot::Hlink)));
     // The title's master style colours its text tx1; a link is hlink and underlined instead.
     assert_eq!(resolve::run(&ctx, title, &para, &RunProps::default()).fill, Some(Fill::solid(ColorRef::scheme(SchemeSlot::Tx1))));
@@ -173,7 +178,7 @@ fn hyperlinked_runs_take_the_theme_hyperlink_look() {
     assert_eq!((r.fill, r.underline.as_deref()), (hlink.clone(), Some("sng")));
     assert_eq!(ctx.color(&ColorRef::scheme(SchemeSlot::Hlink), None), p.masters[0].theme.colors.get(SchemeSlot::Hlink));
     // A slide link looks the same.
-    let slide = Some(Hyperlink { action: Action::Slide { slide: s.id }, tooltip: String::new(), highlight_click: false });
+    let slide = Some(Hyperlink { action: Action::Slide { slide: s.id }, tooltip: String::new(), highlight_click: false, zoom_return: None });
     assert_eq!(resolve::run(&ctx, title, &para, &RunProps { link: slide, ..Default::default() }).fill, hlink);
     // The run's own colour and underline win; u="none" removes the underline.
     let red = Some(Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 0, 0))));
diff --git a/crates/model/src/text.rs b/crates/model/src/text.rs
index 6a1a7527..01e8ba4f 100644
--- a/crates/model/src/text.rs
+++ b/crates/model/src/text.rs
@@ -316,6 +316,10 @@ pub struct Hyperlink {
     pub tooltip: String,
     #[serde(default)]
     pub highlight_click: bool,
+    /// Zoom (Insert ▸ Zoom) with Return to Zoom: in the show, after this slide is shown and
+    /// advanced past, go back to the slide with the zoom. Saved to .pptx as a plain slide link.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub zoom_return: Option<crate::SlideId>,
 }
 
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
diff --git a/crates/pptx/src/read/dml.rs b/crates/pptx/src/read/dml.rs
index 0aee935c..1b57a246 100644
--- a/crates/pptx/src/read/dml.rs
+++ b/crates/pptx/src/read/dml.rs
@@ -470,7 +470,12 @@ pub fn hyperlink(imp: &Imp, part: &Part, h: &El) -> Option<Hyperlink> {
     } else {
         return None;
     };
-    Some(Hyperlink { action: a, tooltip: h.attr("tooltip").unwrap_or("").to_string(), highlight_click: h.bool("highlightClick").unwrap_or(false) })
+    Some(Hyperlink {
+        action: a,
+        tooltip: h.attr("tooltip").unwrap_or("").to_string(),
+        highlight_click: h.bool("highlightClick").unwrap_or(false),
+        zoom_return: None,
+    })
 }
 
 pub fn rpr(imp: &mut Imp, part: &Part, r: &El) -> RunProps {
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..820360ee 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -582,6 +582,7 @@ fn media(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape, m: &deckcraft_
             action: deckcraft_model::text::Action::PlayMedia,
             tooltip: String::new(),
             highlight_click: false,
+            zoom_return: None,
         });
     }
     cnvpr(w, x, o, id, &s2);
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..0b7fc420 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -82,6 +82,7 @@ pub fn rich_deck() -> Presentation {
                                 action: Action::Url { url: "https://example.org/a?b=1&c=2".into() },
                                 tooltip: "tip".into(),
                                 highlight_click: false,
+                                zoom_return: None,
                             }),
                             ..Default::default()
                         },
@@ -153,7 +154,7 @@ pub fn rich_deck() -> Presentation {
         }],
         ..Default::default()
     });
-    b.click = Some(Hyperlink { action: Action::NextSlide, tooltip: String::new(), highlight_click: true });
+    b.click = Some(Hyperlink { action: Action::NextSlide, tooltip: String::new(), highlight_click: true, zoom_return: None });
     let mut c = shape(&mut p, "Freeform", 450.0, 120.0, 100.0, 100.0);
     c.geom = Geom::Custom {
         paths: vec![CustomPath {
@@ -336,7 +337,7 @@ pub fn rich_deck() -> Presentation {
     let target = p.slides[1].id;
     let mut link = shape(&mut p, "Go to shapes", 600.0, 450.0, 200.0, 40.0);
     link.text = Some(TextBody::from_text("Back to shapes"));
-    link.click = Some(Hyperlink { action: Action::Slide { slide: target }, tooltip: String::new(), highlight_click: false });
+    link.click = Some(Hyperlink { action: Action::Slide { slide: target }, tooltip: String::new(), highlight_click: false, zoom_return: None });
     let mut eq = shape(&mut p, "Equation", 100.0, 450.0, 300.0, 40.0);
     eq.text = Some(TextBody {
         paragraphs: vec![Paragraph {
@@ -991,3 +992,62 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+/// Insert › Zoom: slide, section and summary zooms are linked pictures of their targets, with
+/// Return to Zoom on section and summary zooms; a summary zoom makes its own slide; all of it is
+/// one undo step and saves as linked pictures.
+#[test]
+fn zoom_inserts_linked_slide_pictures() {
+    use deckcraft_engine::Session;
+    use deckcraft_model::text::Action;
+    use serde_json::json;
+    let mut s = Session::with_new();
+    for t in ["Intro", "Plan", "Budget", "Risks"] {
+        s.execute("slide.new", &json!({"title": t})).unwrap();
+    }
+    // Slides: 0 title, 1 Intro, 2 Plan, 3 Budget, 4 Risks.
+    s.execute("slide.go", &json!({"index": 0})).unwrap();
+    let r = s.execute("insert.zoom", &json!({"slides": [2]})).unwrap();
+    assert_eq!(r["returnToZoom"], false);
+    let doc = s.doc().unwrap().doc.clone();
+    let zoom = doc.slides[0].shapes.iter().find(|sh| sh.name.starts_with("Slide Zoom")).expect("slide zoom");
+    let link = zoom.click.as_ref().unwrap();
+    assert_eq!(link.action, Action::Slide { slide: doc.slides[2].id });
+    assert_eq!(link.zoom_return, None);
+    assert_eq!(link.tooltip, "Plan");
+    let ShapeKind::Picture { fill } = &zoom.kind else { panic!() };
+    assert!(doc.media(fill.media).is_some_and(|m| m.data.starts_with(b"\x89PNG")));
+
+    // Section zoom: back after the section's last slide.
+    s.execute("section.add", &json!({"name": "Start", "at": 0})).unwrap();
+    s.execute("section.add", &json!({"name": "Money", "at": 3})).unwrap();
+    let doc = s.doc().unwrap().doc.clone();
+    let money = doc.sections.iter().position(|x| x.name == "Money").unwrap();
+    s.execute("slide.go", &json!({"index": 0})).unwrap();
+    s.execute("insert.zoom", &json!({"kind": "section", "sections": [money]})).unwrap();
+    let doc = s.doc().unwrap().doc.clone();
+    let sec = doc.slides[0].shapes.iter().find(|sh| sh.name.starts_with("Section Zoom")).unwrap();
+    let last = *doc.sections[money].slides.last().unwrap();
+    assert_eq!(sec.click.as_ref().unwrap().zoom_return, Some(last));
+
+    // Summary zoom on slides 1 and 3: a new slide in front, parts 1–2 and 3–4.
+    let before = doc.slides.len();
+    s.execute("insert.zoom", &json!({"kind": "summary", "slides": [1, 3]})).unwrap();
+    let doc = s.doc().unwrap().doc.clone();
+    assert_eq!(doc.slides.len(), before + 1);
+    let sum = &doc.slides[1];
+    assert!(sum.title().contains("Summary"));
+    let tiles: Vec<_> = sum.shapes.iter().filter_map(|sh| sh.click.as_ref()).collect();
+    assert_eq!(tiles.len(), 2);
+    assert_eq!(tiles[0].zoom_return, Some(doc.slides[3].id), "part one runs to the slide before part two");
+    assert_eq!(tiles[1].zoom_return, Some(doc.slides.last().unwrap().id));
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.slides.len(), before, "one undo step");
+
+    // Saved as linked pictures.
+    let back = deckcraft_pptx::import(&deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap()).unwrap();
+    let z = back.slides[0].shapes.iter().find(|sh| matches!(sh.kind, ShapeKind::Picture { .. }) && sh.click.is_some()).unwrap();
+    assert!(matches!(z.click.as_ref().unwrap().action, Action::Slide { .. }));
+    assert!(s.execute("insert.zoom", &json!({"slides": [42]})).is_err());
+    assert!(s.execute("insert.zoom", &json!({"kind": "slide"})).is_err());
+}
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..f812ecd5 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -539,7 +539,12 @@ fn hyperlinks_draw_in_the_hyperlink_colour_underlined() {
     let o = RenderOpts { scale: 0.5, ..Default::default() };
     let px = |p: &Presentation| render_slide(p, 0, &o);
     let diff = |a: &Image, b: &Image| a.pixels.iter().zip(&b.pixels).filter(|(x, y)| x.abs_diff(**y) > 64).count();
-    let link = Some(Hyperlink { action: Action::Url { url: "https://example.org".into() }, tooltip: String::new(), highlight_click: false });
+    let link = Some(Hyperlink {
+        action: Action::Url { url: "https://example.org".into() },
+        tooltip: String::new(),
+        highlight_click: false,
+        zoom_return: None,
+    });
     let hlink = Some(Fill::solid(ColorRef::scheme(deckcraft_color::SchemeSlot::Hlink)));
     let red = Some(Fill::solid(ColorRef::rgb(Rgba::rgb(200, 0, 0))));
     let _ = px(&run_deck(RunProps::default())); // faces load lazily
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..731e7289 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1054,6 +1054,8 @@ fn insert(app: &mut SlideApp, ui: &mut Ui) {
         });
     });
     group(ui, |ui| {
+        let r = big_button(ui, Icon::Zoom, "Zoom", enabled(app, "insert.zoom"));
+        egui::Popup::menu(&r).close_behavior(egui::PopupCloseBehavior::CloseOnClickOutside).width(300.0).show(|ui| zoom_menu(app, ui));
         big(app, ui, Icon::Link, "Link", "app.dialog", json!({"id": "hyperlink"}));
         let r = big_button(ui, Icon::Action, "Action", enabled(app, "insert.actionButton"));
         egui::Popup::menu(&r).show(|ui| {
@@ -2420,3 +2422,61 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+/// Insert › Zoom: pick Summary, Section or Slide Zoom and what it zooms to, as PowerPoint's
+/// Insert Zoom dialogs do (a checklist of slides or sections).
+fn zoom_menu(app: &mut SlideApp, ui: &mut Ui) {
+    let Some(doc) = app.session.active().map(|d| d.doc.clone()) else { return };
+    let id = egui::Id::new("insert_zoom_menu");
+    let (mut kind, mut picked): (u8, Vec<usize>) = ui.data_mut(|d| d.get_temp(id).unwrap_or((0, vec![])));
+    ui.horizontal(|ui| {
+        for (k, label) in [(0u8, "Slide Zoom"), (1, "Section Zoom"), (2, "Summary Zoom")] {
+            if ui.selectable_label(kind == k, label).clicked() && kind != k {
+                kind = k;
+                picked.clear();
+            }
+        }
+    });
+    ui.separator();
+    let items: Vec<String> = if kind == 1 {
+        doc.sections.iter().map(|s| s.name.clone()).collect()
+    } else {
+        doc.slides
+            .iter()
+            .enumerate()
+            .map(|(i, s)| {
+                let t = s.title();
+                format!("{}. {}", i + 1, t.lines().next().unwrap_or("").trim())
+            })
+            .collect()
+    };
+    if items.is_empty() {
+        ui.label(if kind == 1 { "The presentation has no sections. Add one with Home › Section." } else { "No slides." });
+    }
+    egui::ScrollArea::vertical().max_height(260.0).show(ui, |ui| {
+        for (i, label) in items.iter().enumerate() {
+            let mut on = picked.contains(&i);
+            if ui.checkbox(&mut on, label).changed() {
+                if on {
+                    picked.push(i);
+                } else {
+                    picked.retain(|x| *x != i);
+                }
+            }
+        }
+    });
+    ui.data_mut(|d| d.insert_temp(id, (kind, picked.clone())));
+    ui.separator();
+    if ui.add_enabled(!picked.is_empty(), egui::Button::new("Insert")).clicked() {
+        let mut v = picked.clone();
+        v.sort_unstable();
+        let p = match kind {
+            1 => json!({"kind": "section", "sections": v}),
+            2 => json!({"kind": "summary", "slides": v}),
+            _ => json!({"kind": "slide", "slides": v}),
+        };
+        run(app, "insert.zoom", p);
+        ui.data_mut(|d| d.remove::<(u8, Vec<usize>)>(id));
+        ui.close();
+    }
+}
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..6a03ee89 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -324,7 +324,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         app.media.toggle(&doc, id, &clip, crate::media::Owner::Show);
     } else if clicked && let Some(l) = &link {
         let last = show.last_viewed;
-        match show.state.follow(&doc, &l.action, last) {
+        match show.state.follow_link(&doc, l, last) {
             LinkJump::Show(a) => actions.push(a),
             LinkJump::Open(url) => ctx.open_url(egui::OpenUrl::new_tab(url)),
             LinkJump::Exit => keep = false,
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..69a1de6e 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -184,7 +184,7 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 - **Estimate:** 3–6 h to review, land and round-trip.
 
 ### Smaller missing rows
-Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
+Zoom: live thumbnails, the zoom-in animation and the native `p166:sldZm` element (3–5 h; `insert.zoom` makes linked pictures with Return to Zoom), reuse slides (2–4 h), laser pointer (1–2 h), transition
 sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
 matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..1d974036 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -79,7 +79,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Slides | Reset slide | P1 | D |
 | Slides | Slides from outline | P2 | D |
 | Slides | Copy/paste slides between decks | P1 | P |
-| Slides | Zoom (summary, section and slide zoom) | P2 | M |
+| Slides | Zoom (summary, section and slide zoom) | P2 | P |
 | Views | Normal view (thumbnails, slide, notes) | P0 | D |
 | Views | Outline view | P1 | D |
 | Views | Slide Sorter | P0 | D |

From e615188f8ba12e4cbde44b4906a5fb53fef2c928 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:43:32 +0300
Subject: [PATCH 161/376] Text: AutoCorrect options, case rules and your own
 entries
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

AutoCorrect gains PowerPoint's options: correct TWo INitial CApitals,
capitalize the first letter of sentences and the names of days, fix
accidental cAPS LOCK, and replace 1/2, 1/4, 3/4 with fraction
characters. "word..." becomes "word…", "word," and "word." are corrected
too, and the built-in list grows from 13 to ~70 entries. The case rules
apply only to typing, not pasted text.

New text.autocorrect sets the options and adds or deletes replace
entries (your own win over the built-in list; deleted built-ins stay
deleted) and returns the list. Preferences ▸ AutoCorrect Options… opens
an AutoCorrect dialog with the options and the editable list.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/text.rs | 228 ++++++++++++++++++++++++++++++++--
 crates/engine/src/lib.rs      |  19 +++
 crates/engine/src/tests.rs    |  37 ++++++
 crates/ui-egui/src/dialogs.rs |  53 +++++++-
 docs/gaps.md                  |   5 +-
 docs/parity-checklist.md      |   2 +-
 6 files changed, 333 insertions(+), 11 deletions(-)

diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..cab53299 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -15,6 +15,15 @@ pub fn specs() -> Vec<CommandSpec> {
     vec![
         cmd!(noundo "text.edit", "Edit Text", [], Some("Enter"), "{id?, at?: [paragraph, char], end?: bool, cell?: [row, col], notes?: bool}", has_slide, edit),
         cmd!(noundo "text.exit", "Stop Editing Text", [], None, "{}", has_doc, exit),
+        cmd!(
+            noundo "text.autocorrect",
+            "AutoCorrect Options",
+            ["Tools"],
+            None,
+            "{on?, twoInitials?, sentenceCaps?, days?, capsLock?, fractions?: bool, add?: [from, to], remove?: from} → the options and the replacement list",
+            always,
+            autocorrect_options
+        ),
         cmd!("text.insert", "Type Text", [], None, "{text} (\\n = new paragraph, \\u000b = line break)", has_text, insert),
         cmd!("text.delete", "Delete Text", [], Some("Backspace"), "{dir?: backward|forward|wordBackward|wordForward}", has_text, delete),
         // The input method's composition: shown in place, an undo step only once committed.
@@ -294,7 +303,7 @@ pub(crate) fn insert_text(s: &mut Session, text: &str, props: Option<RunProps>)
         t.caret = c;
         c
     })?;
-    autocorrect(s)?;
+    autocorrect(s, text.chars().count() == 1)?;
     Ok(json!({"caret": [pos.0, pos.1]}))
 }
 
@@ -312,24 +321,151 @@ fn unlinked_at_link_end(body: &TextBody, at: Pos) -> Option<RunProps> {
     Some(props)
 }
 
-const AUTOCORRECT: &[(&str, &str)] = &[
+/// Built-in AutoCorrect replacements (common slips and symbols).
+pub const AUTOCORRECT: &[(&str, &str)] = &[
     ("teh", "the"),
     ("adn", "and"),
     ("recieve", "receive"),
+    ("recieved", "received"),
     ("seperate", "separate"),
     ("occured", "occurred"),
+    ("occurence", "occurrence"),
     ("thier", "their"),
     ("wich", "which"),
+    ("acheive", "achieve"),
+    ("accross", "across"),
+    ("adress", "address"),
+    ("alot", "a lot"),
+    ("appearence", "appearance"),
+    ("arguement", "argument"),
+    ("basicly", "basically"),
+    ("beggining", "beginning"),
+    ("beleive", "believe"),
+    ("calender", "calendar"),
+    ("commitee", "committee"),
+    ("definately", "definitely"),
+    ("dont", "don't"),
+    ("doesnt", "doesn't"),
+    ("didnt", "didn't"),
+    ("cant", "can't"),
+    ("wont", "won't"),
+    ("isnt", "isn't"),
+    ("embarass", "embarrass"),
+    ("enviroment", "environment"),
+    ("existance", "existence"),
+    ("foward", "forward"),
+    ("freind", "friend"),
+    ("goverment", "government"),
+    ("happend", "happened"),
+    ("i", "I"),
+    ("im", "I'm"),
+    ("ive", "I've"),
+    ("immediatly", "immediately"),
+    ("independant", "independent"),
+    ("knowlege", "knowledge"),
+    ("libary", "library"),
+    ("neccessary", "necessary"),
+    ("necesary", "necessary"),
+    ("noticable", "noticeable"),
+    ("occassion", "occasion"),
+    ("posession", "possession"),
+    ("prefered", "preferred"),
+    ("publically", "publicly"),
+    ("realy", "really"),
+    ("recomend", "recommend"),
+    ("refered", "referred"),
+    ("relevent", "relevant"),
+    ("succesful", "successful"),
+    ("tommorow", "tomorrow"),
+    ("tomorow", "tomorrow"),
+    ("truely", "truly"),
+    ("untill", "until"),
+    ("wierd", "weird"),
+    ("youre", "you're"),
     ("(c)", "©"),
     ("(r)", "®"),
     ("(tm)", "™"),
+    ("(e)", "€"),
+    ("...", "…"),
     ("->", "→"),
     ("<-", "←"),
+    ("=>", "⇒"),
     ("--", "–"),
 ];
 
-/// After a space or punctuation, replace a just-typed autocorrect entry.
-fn autocorrect(s: &mut Session) -> Result<()> {
+const DAYS: &[&str] = &["monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"];
+
+/// The replacement for `word` from your entries, then the built-in list.
+fn replacement(prefs: &crate::Prefs, word: &str) -> Option<String> {
+    if let Some((_, to)) = prefs.ac_entries.iter().find(|(k, _)| k == word) {
+        return Some(to.clone());
+    }
+    if let Some((_, to)) = prefs.ac_entries.iter().find(|(k, _)| k.eq_ignore_ascii_case(word)) {
+        return Some(to.clone());
+    }
+    let (k, to) = AUTOCORRECT.iter().find(|(k, _)| k.eq_ignore_ascii_case(word))?;
+    if prefs.ac_removed.iter().any(|r| r.eq_ignore_ascii_case(k)) {
+        return None;
+    }
+    // "i" only on its own, lower case.
+    if *k == "i" && word != "i" {
+        return None;
+    }
+    Some(if word.chars().next().is_some_and(char::is_uppercase) { ed::change_case(to, "sentence") } else { to.to_string() })
+}
+
+/// What a just-typed `word` becomes (`None`: unchanged). `sentence_start`: nothing but spaces
+/// or a sentence's end (`.`, `!`, `?`) before it in the paragraph. `typing`: one character was
+/// typed (the case rules apply only then).
+pub fn correct_word(prefs: &crate::Prefs, word: &str, sentence_start: bool, typing: bool) -> Option<String> {
+    let mut out = replacement(prefs, word);
+    if typing && out.is_none() {
+        let chars: Vec<char> = word.chars().collect();
+        let letters = chars.iter().all(|c| c.is_alphabetic());
+        if prefs.ac_fractions {
+            out = match word {
+                "1/2" => Some("½".into()),
+                "1/4" => Some("¼".into()),
+                "3/4" => Some("¾".into()),
+                _ => None,
+            };
+        }
+        if out.is_none() && letters && chars.len() >= 3 {
+            let upper = |c: &char| c.is_uppercase();
+            let rest_lower = chars.get(2..).is_some_and(|r| r.iter().all(|c| c.is_lowercase()));
+            let rest_upper = chars.get(1..).is_some_and(|r| r.iter().all(upper));
+            if prefs.ac_two_initials && chars.first().is_some_and(upper) && chars.get(1).is_some_and(upper) && rest_lower {
+                out =
+                    Some(chars.iter().enumerate().map(|(i, c)| if i == 1 { c.to_lowercase().collect::<String>() } else { c.to_string() }).collect());
+            } else if prefs.ac_caps_lock && chars.first().is_some_and(|c| c.is_lowercase()) && rest_upper {
+                out = Some(
+                    chars
+                        .iter()
+                        .enumerate()
+                        .map(|(i, c)| if i == 0 { c.to_uppercase().collect::<String>() } else { c.to_lowercase().collect() })
+                        .collect(),
+                );
+            }
+        }
+        if out.is_none() && prefs.ac_days && DAYS.contains(&word) {
+            out = Some(ed::change_case(word, "sentence"));
+        }
+    }
+    if typing && prefs.ac_sentence_caps && sentence_start {
+        let w = out.clone().unwrap_or_else(|| word.to_string());
+        let mut cs = w.chars();
+        if let Some(f) = cs.next()
+            && f.is_lowercase()
+            && w.chars().all(char::is_alphabetic)
+        {
+            out = Some(f.to_uppercase().chain(cs).collect());
+        }
+    }
+    out.filter(|o| o != word)
+}
+
+/// After a space or punctuation, correct the word just typed.
+fn autocorrect(s: &mut Session, typing: bool) -> Result<()> {
     if !s.prefs.autocorrect {
         return Ok(());
     }
@@ -341,14 +477,31 @@ fn autocorrect(s: &mut Session) -> Result<()> {
     if end == 0 || !line.get(end - 1).is_some_and(|c| c.is_whitespace() || ".,;:!?".contains(*c)) {
         return Ok(());
     }
-    let word_end = end - 1;
+    let mut word_end = end - 1;
     let mut start = word_end;
     while start > 0 && line.get(start - 1).is_some_and(|c| !c.is_whitespace()) {
         start -= 1;
     }
-    let word: String = line.get(start..word_end).map(|w| w.iter().collect()).unwrap_or_default();
-    let Some((_, rep)) = AUTOCORRECT.iter().find(|(k, _)| k.eq_ignore_ascii_case(&word)) else { return Ok(()) };
-    let rep = if word.chars().next().is_some_and(char::is_uppercase) { ed::change_case(rep, "sentence") } else { rep.to_string() };
+    // "word," and "word." also count: the punctuation was typed before the space.
+    let mut word: String = line.get(start..word_end).map(|w| w.iter().collect()).unwrap_or_default();
+    if replacement(&s.prefs, &word).is_none() {
+        let trimmed = word.trim_end_matches(|c: char| ".,;:!?".contains(c));
+        if !trimmed.is_empty() && trimmed.len() < word.len() && !word.ends_with("...") {
+            word_end -= word.chars().count() - trimmed.chars().count();
+            word = trimmed.to_string();
+        }
+    }
+    let before = line.get(..start).map(|b| b.iter().rev().find(|c| !c.is_whitespace()).copied()).unwrap_or(None);
+    let sentence_start = before.is_none_or(|c| ".!?".contains(c));
+    // "word..." becomes "word…", the word corrected too.
+    let ellipsis = word.chars().count() > 3 && word.ends_with("...") && replacement(&s.prefs, "...").is_some();
+    let rep = if ellipsis {
+        let stem = word.trim_end_matches('.');
+        Some(format!("{}…", correct_word(&s.prefs, stem, sentence_start, typing).unwrap_or_else(|| stem.to_string())))
+    } else {
+        correct_word(&s.prefs, &word, sentence_start, typing)
+    };
+    let Some(rep) = rep else { return Ok(()) };
     let delta = rep.chars().count() as isize - word.chars().count() as isize;
     let st = s.doc_mut()?;
     let mut d = (*st.doc).clone();
@@ -367,6 +520,65 @@ fn autocorrect(s: &mut Session) -> Result<()> {
     Ok(())
 }
 
+fn autocorrect_options(s: &mut Session, p: &Value) -> Result<Value> {
+    let pr = &mut s.prefs;
+    for (key, slot) in [
+        ("on", &mut pr.autocorrect),
+        ("twoInitials", &mut pr.ac_two_initials),
+        ("sentenceCaps", &mut pr.ac_sentence_caps),
+        ("days", &mut pr.ac_days),
+        ("capsLock", &mut pr.ac_caps_lock),
+        ("fractions", &mut pr.ac_fractions),
+    ] {
+        if let Some(v) = p.get(key).and_then(Value::as_bool) {
+            *slot = v;
+        }
+    }
+    if let Some(Value::Array(a)) = p.get("add") {
+        let (Some(from), Some(to)) = (a.first().and_then(Value::as_str), a.get(1).and_then(Value::as_str)) else {
+            return Err(bad("text.autocorrect", "`add` is [from, to]"));
+        };
+        let from = from.trim();
+        if from.is_empty() || from.chars().any(char::is_whitespace) || from.chars().count() > 64 || to.chars().count() > 255 {
+            return Err(bad("text.autocorrect", "`from` is one word (up to 64 characters), `to` up to 255"));
+        }
+        pr.ac_entries.retain(|(k, _)| k != from);
+        pr.ac_removed.retain(|k| !k.eq_ignore_ascii_case(from));
+        if pr.ac_entries.len() >= 2000 {
+            return Err(bad("text.autocorrect", "the list is full"));
+        }
+        pr.ac_entries.push((from.to_string(), to.to_string()));
+    }
+    if let Some(from) = str_param(p, "remove") {
+        let had = pr.ac_entries.len();
+        pr.ac_entries.retain(|(k, _)| k != from);
+        if had == pr.ac_entries.len()
+            && AUTOCORRECT.iter().any(|(k, _)| k.eq_ignore_ascii_case(from))
+            && !pr.ac_removed.iter().any(|r| r.eq_ignore_ascii_case(from))
+        {
+            pr.ac_removed.push(from.to_string());
+        }
+    }
+    let list: Vec<(String, String)> = pr
+        .ac_entries
+        .iter()
+        .cloned()
+        .chain(
+            AUTOCORRECT
+                .iter()
+                .filter(|(k, _)| {
+                    !pr.ac_removed.iter().any(|r| r.eq_ignore_ascii_case(k)) && !pr.ac_entries.iter().any(|(e, _)| e.eq_ignore_ascii_case(k))
+                })
+                .map(|(k, v)| (k.to_string(), v.to_string())),
+        )
+        .collect();
+    Ok(json!({
+        "on": pr.autocorrect, "twoInitials": pr.ac_two_initials, "sentenceCaps": pr.ac_sentence_caps,
+        "days": pr.ac_days, "capsLock": pr.ac_caps_lock, "fractions": pr.ac_fractions,
+        "entries": list,
+    }))
+}
+
 pub(crate) fn paste_body(s: &mut Session, src: &TextBody) -> Result<Value> {
     let pos = edit_text(s, |body, t| {
         let (a, b) = t.ordered();
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..9db1dc10 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -247,6 +247,18 @@ pub struct Prefs {
     pub duplicate_offset: f64,
     pub autocorrect: bool,
     pub smart_quotes: bool,
+    /// AutoCorrect options (Tools ▸ AutoCorrect): fix TWo INitial CApitals, capitalize the first
+    /// letter of sentences and the names of days, fix accidental cAPS lOCK, and replace 1/2, 1/4
+    /// and 3/4 with fraction characters.
+    pub ac_two_initials: bool,
+    pub ac_sentence_caps: bool,
+    pub ac_days: bool,
+    pub ac_caps_lock: bool,
+    pub ac_fractions: bool,
+    /// Your own "replace … with …" entries; they win over the built-in list.
+    pub ac_entries: Vec<(String, String)>,
+    /// Built-in entries you deleted.
+    pub ac_removed: Vec<String>,
     pub author: String,
     pub undo_limit: usize,
     /// Minutes between AutoRecover saves of unsaved presentations.
@@ -262,6 +274,13 @@ impl Default for Prefs {
             duplicate_offset: 12.0,
             autocorrect: true,
             smart_quotes: true,
+            ac_two_initials: true,
+            ac_sentence_caps: true,
+            ac_days: true,
+            ac_caps_lock: true,
+            ac_fractions: true,
+            ac_entries: Vec::new(),
+            ac_removed: Vec::new(),
             author: "Presenter".into(),
             undo_limit: 500,
             recovery_minutes: 1.0,
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..a681967b 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,40 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn autocorrect_options_as_you_type() {
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+    let typed = |s: &mut Session, text: &str| -> String {
+        s.execute("text.edit", &json!({"id": title})).unwrap();
+        s.execute("text.selectAll", &json!({})).ok();
+        s.execute("text.delete", &json!({"dir": "backward"})).ok();
+        for c in text.chars() {
+            s.execute("text.insert", &json!({"text": c.to_string()})).unwrap();
+        }
+        s.execute("text.get", &json!({"id": title})).unwrap()["text"].as_str().unwrap().to_string()
+    };
+    assert_eq!(typed(&mut s, "hello world. see you monday, i think. "), "Hello world. See you Monday, I think. ");
+    assert_eq!(typed(&mut s, "THe tHIS 1/2 recieved... "), "The This ½ received… ");
+    // Options turn rules off.
+    s.execute("text.autocorrect", &json!({"sentenceCaps": false, "days": false})).unwrap();
+    assert_eq!(typed(&mut s, "hello monday "), "hello monday ");
+    // Your own entries, and deleting a built-in one.
+    s.execute("text.autocorrect", &json!({"add": ["dc", "DeckCraft"], "remove": "teh"})).unwrap();
+    assert_eq!(typed(&mut s, "dc teh "), "DeckCraft teh ");
+    let v = s.execute("text.autocorrect", &json!({})).unwrap();
+    let entries = v["entries"].as_array().unwrap();
+    assert!(entries.iter().any(|e| e[0] == "dc"));
+    assert!(!entries.iter().any(|e| e[0] == "teh"));
+    assert!(s.execute("text.autocorrect", &json!({"add": ["two words", "x"]})).is_err());
+    // Off entirely.
+    s.execute("text.autocorrect", &json!({"on": false})).unwrap();
+    assert_eq!(typed(&mut s, "dc adn "), "dc adn ");
+    // Pasting a whole string applies only the replacement list, not the case rules.
+    s.execute("text.autocorrect", &json!({"on": true, "sentenceCaps": true})).unwrap();
+    s.execute("text.edit", &json!({"id": title})).unwrap();
+    s.execute("text.selectAll", &json!({})).ok();
+    s.execute("text.insert", &json!({"text": "monday notes "})).unwrap();
+    assert_eq!(s.execute("text.get", &json!({"id": title})).unwrap()["text"], "monday notes ");
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..969a5310 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -45,6 +45,7 @@ fn title(id: &str) -> &'static str {
         "paragraph" => "Paragraph",
         "about" => "About DeckCraft",
         "preferences" => "Preferences",
+        "autocorrect" => "AutoCorrect",
         "export" => "Export",
         "symbol" => "Symbol",
         "equation" => "Equation",
@@ -708,6 +709,48 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             let (ok, _) = buttons(ui, "Close");
             ok
         }
+        "autocorrect" => {
+            let pr = &mut app.session.prefs;
+            ui.checkbox(&mut pr.ac_two_initials, "Correct TWo INitial CApitals");
+            ui.checkbox(&mut pr.ac_sentence_caps, "Capitalize first letter of sentences");
+            ui.checkbox(&mut pr.ac_days, "Capitalize names of days");
+            ui.checkbox(&mut pr.ac_caps_lock, "Correct accidental use of cAPS LOCK key");
+            ui.checkbox(&mut pr.ac_fractions, "Replace fractions (1/2) with fraction characters (½)");
+            ui.checkbox(&mut pr.autocorrect, "Replace text as you type");
+            ui.add_space(4.0);
+            let mut from = d.get("from", "");
+            let mut to = d.get("to", "");
+            ui.horizontal(|ui| {
+                ui.label("Replace");
+                ui.add(egui::TextEdit::singleline(&mut from).desired_width(90.0));
+                ui.label("With");
+                ui.add(egui::TextEdit::singleline(&mut to).desired_width(130.0));
+                if ui.add_enabled(!from.trim().is_empty(), egui::Button::new("Add")).clicked() {
+                    run(app, "text.autocorrect", json!({"add": [from.trim(), to]}));
+                    from.clear();
+                    to.clear();
+                }
+            });
+            d.fields.insert("from".into(), from.clone());
+            d.fields.insert("to".into(), to);
+            let list = app.session.execute("text.autocorrect", &json!({})).ok().and_then(|v| v.get("entries").cloned());
+            let entries: Vec<(String, String)> = list.and_then(|v| serde_json::from_value(v).ok()).unwrap_or_default();
+            let q = from.trim().to_lowercase();
+            egui::ScrollArea::vertical().max_height(220.0).show(ui, |ui| {
+                egui::Grid::new("ac-list").striped(true).show(ui, |ui| {
+                    for (k, v) in entries.iter().filter(|(k, _)| q.is_empty() || k.to_lowercase().starts_with(&q)) {
+                        ui.label(k);
+                        ui.label(v);
+                        if ui.small_button("Delete").clicked() {
+                            run(app, "text.autocorrect", json!({"remove": k}));
+                        }
+                        ui.end_row();
+                    }
+                });
+            });
+            let (ok, cancel) = buttons(ui, "OK");
+            ok || cancel
+        }
         "preferences" => {
             ui.label(egui::RichText::new("General").font(theme::bold(13.0)));
             let mut dark = app.ui.brightness == theme::Brightness::Dark;
@@ -722,7 +765,15 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             ui.checkbox(&mut app.session.prefs.smart_guides, "Show smart guides");
             ui.checkbox(&mut app.session.prefs.snap_to_grid, "Snap objects to grid");
             ui.checkbox(&mut app.session.prefs.smart_quotes, "Replace straight quotes with smart quotes");
-            ui.checkbox(&mut app.session.prefs.autocorrect, "AutoCorrect as you type");
+            ui.horizontal(|ui| {
+                ui.checkbox(&mut app.session.prefs.autocorrect, "AutoCorrect as you type");
+                if ui.button("AutoCorrect Options…").clicked() {
+                    *d = Dialog::new("autocorrect");
+                }
+            });
+            if d.id != "preferences" {
+                return false;
+            }
             ui.horizontal(|ui| {
                 ui.label("Your name (comments):");
                 ui.text_edit_singleline(&mut app.session.prefs.author);
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..a934cf1c 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -176,7 +176,9 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 
 ### Proofing: spelling, thesaurus, AutoCorrect
 - **Evidence:** `review.spelling` checks a small built-in list of frequent misspellings
-  (`crates/engine/src/cmd/review.rs`); no dictionaries, no thesaurus, no AutoCorrect.
+  (`crates/engine/src/cmd/review.rs`); no dictionaries, no thesaurus. AutoCorrect has PowerPoint's options (two initial capitals,
+  sentence and day capitals, caps lock, fractions, an editable replace list); no AutoFormat of
+  ordinals or automatic bulleted lists, no undo of a single correction.
 - **Estimate:** 8–14 h (Hunspell-format dictionaries under an open licence per language).
 
 ### Equations
@@ -256,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | AutoCorrect options: case rules, fractions, ellipsis, a larger built-in list and your own entries (`text.autocorrect`, Tools ▸ AutoCorrect) |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..593509a2 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -156,7 +156,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Text | Find and replace, replace fonts | P1 | P |
 | Text | Spelling check | P1 | P |
 | Text | Thesaurus | P2 | M |
-| Text | AutoCorrect and smart quotes | P2 | M |
+| Text | AutoCorrect and smart quotes | P2 | Y |
 | Text | Symbols and emoji | P1 | D |
 | Text | Equations | P2 | M |
 | Text | Hyperlinks (URL, slide, email) | P1 | D |

From 10ad8d7ba7487d847a7709b3059638ae668129dd Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:44:42 +0300
Subject: [PATCH 162/376] UI: keep editor slides on the Retina pixel grid

The editing canvas, thumbnails and layout previews were drawn between
physical pixels, so a linear filter blurred small text. The slide show
draws much larger glyphs, which is why presenting still looked sharp (#184).

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                     |  2 +
 crates/ui-egui/src/canvas.rs   |  7 ++--
 crates/ui-egui/src/panes.rs    | 17 +++++---
 crates/ui-egui/src/ribbon.rs   | 10 +++--
 crates/ui-egui/src/sorter.rs   |  9 +++--
 crates/ui-egui/src/textures.rs | 74 ++++++++++++++++++++++++++++++++--
 crates/ui-egui/src/thumbs.rs   | 15 ++++---
 docs/hardware-parity.md        |  5 ++-
 docs/ui-parity.md              |  9 +++--
 9 files changed, 117 insertions(+), 31 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..36ab29a3 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Editor slide rasters sit on the physical pixel grid, so small text stays sharp on a Retina display instead of being blurred by a linear filter between pixels (#184) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: editor rasters on the Retina pixel grid (#184) |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..8b78b903 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -95,14 +95,15 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     offset.x = offset.x.clamp(0.0, overflow.x);
     offset.y = offset.y.clamp(0.0, overflow.y);
     ui.data_mut(|d| d.insert_temp(scroll_id, offset));
-    let slide_rect = content_rect.translate(-offset);
+    // On the physical pixel grid, so the slide texture is one texel per device pixel (#184).
+    let ppp = ui.ctx().pixels_per_point();
+    let slide_rect = crate::textures::device_pixel_rect(content_rect.translate(-offset), ppp);
     app.slide_rect = Some(slide_rect);
     app.canvas_scale = scale;
     let xf = Xf { origin: slide_rect.min, scale };
     let painter = ui.painter_at(avail);
     // Shadow + slide.
     painter.rect_filled(slide_rect.translate(vec2(0.0, 1.5)).expand(1.0), CornerRadius::same(2), t.shadow);
-    let ppp = ui.ctx().pixels_per_point();
     let px = ((slide_rect.width() * ppp).round().max(1.0) as u32, (slide_rect.height() * ppp).round().max(1.0) as u32);
     let now = ui.input(|i| i.time);
     let gifs = match app.session.active() {
@@ -320,7 +321,7 @@ fn master_tex(
         layout,
         &deckcraft_render::RenderOpts { scale, edit: true, offset: region.offset(), size: Some(region.size()), ..Default::default() },
     );
-    Some((ctx.load_texture("master-canvas", crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR), region))
+    Some((ctx.load_texture("master-canvas", crate::textures::to_color_image(&img, false), crate::textures::editor_texture_options()), region))
 }
 
 fn ruler(p: &egui::Painter, avail: Rect, slide: Rect, scale: f32, t: &Tokens) {
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..80af92f6 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -613,18 +613,23 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
             m.theme = th.clone();
         }
         let ppp = ui.ctx().pixels_per_point();
-        let px = (w * ppp) as u32;
-        let h = (px as f64 * d.slide_size.height / d.slide_size.width.max(1.0)) as u32;
+        let (r, resp) = ui.allocate_exact_size(vec2(w, w * (d.slide_size.height / d.slide_size.width.max(1.0)) as f32), Sense::click());
+        let at = crate::textures::device_pixel_rect(r, ppp);
+        let px = (at.width() * ppp).round().max(1.0) as u32;
+        let h = (px as f64 * d.slide_size.height / d.slide_size.width.max(1.0)).round().max(1.0) as u32;
         let img = deckcraft_render::render_slide(
             &d,
             idx,
             &deckcraft_render::RenderOpts { scale: px as f64 / d.slide_size.width.max(1.0), size: Some((px, h)), ..Default::default() },
         );
-        let tex = ui.ctx().load_texture(format!("idea-{}", th.name), crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR);
-        let (r, resp) = ui.allocate_exact_size(vec2(w, w * h as f32 / px.max(1) as f32), Sense::click());
-        ui.painter().image(tex.id(), r, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
+        let tex = ui.ctx().load_texture(
+            format!("idea-{}", th.name),
+            crate::textures::to_color_image(&img, false),
+            crate::textures::editor_texture_options(),
+        );
+        ui.painter().image(tex.id(), at, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
         ui.painter().rect_stroke(
-            r,
+            at,
             CornerRadius::same(2),
             Stroke::new(if resp.hovered() { 2.5 } else { 1.0 }, if resp.hovered() { t.accent } else { t.border }),
             egui::StrokeKind::Outside,
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..12766d37 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -339,9 +339,13 @@ fn layout_menu(app: &mut SlideApp, ui: &mut Ui, cmd: &str) {
                             ..Default::default()
                         },
                     );
-                    let tex =
-                        ui.ctx().load_texture(format!("layout-{li}"), crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR);
-                    ui.painter().image(tex.id(), rect, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
+                    let tex = ui.ctx().load_texture(
+                        format!("layout-{li}"),
+                        crate::textures::to_color_image(&img, false),
+                        crate::textures::editor_texture_options(),
+                    );
+                    let at = crate::textures::device_pixel_rect(rect, ui.ctx().pixels_per_point());
+                    ui.painter().image(tex.id(), at, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
                 }
                 let t = Tokens::get(ui.ctx());
                 ui.painter().rect_stroke(
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index dd26dd85..c416d1b0 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -32,10 +32,10 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                         break;
                     }
                     let (cell, resp) = ui.allocate_exact_size(vec2(tw + 36.0, th + 36.0), Sense::click_and_drag());
-                    let img = Rect::from_min_size(cell.min + vec2(18.0, 8.0), vec2(tw, th));
+                    let img = crate::textures::device_pixel_rect(Rect::from_min_size(cell.min + vec2(18.0, 8.0), vec2(tw, th)), ppp);
                     rects.push((i, cell));
                     let p = ui.painter();
-                    match app.textures.thumb(ui.ctx(), &doc, i, (tw * ppp) as u32, &mut budget) {
+                    match app.textures.thumb(ui.ctx(), &doc, i, (img.width() * ppp).round() as u32, &mut budget) {
                         Some(tex) => {
                             p.image(tex.id(), img, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
                         }
@@ -123,10 +123,11 @@ pub fn notes_page(app: &mut SlideApp, ui: &mut Ui) {
     ui.painter().rect_filled(page, CornerRadius::ZERO, Color32::WHITE);
     let sw = page_w * 0.78;
     let sh = sw * (doc.slide_size.height / doc.slide_size.width.max(1.0)) as f32;
-    let srect = Rect::from_min_size(pos2(page.center().x - sw / 2.0, page.min.y + page_h * 0.08), vec2(sw, sh));
     let ppp = ui.ctx().pixels_per_point();
+    let srect =
+        crate::textures::device_pixel_rect(Rect::from_min_size(pos2(page.center().x - sw / 2.0, page.min.y + page_h * 0.08), vec2(sw, sh)), ppp);
     let mut budget = 2;
-    if let Some(tex) = app.textures.thumb(ui.ctx(), &doc, idx, (sw * ppp) as u32, &mut budget) {
+    if let Some(tex) = app.textures.thumb(ui.ctx(), &doc, idx, (srect.width() * ppp).round() as u32, &mut budget) {
         ui.painter().image(tex.id(), srect, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
     }
     ui.painter().rect_stroke(srect, CornerRadius::ZERO, Stroke::new(1.0, Color32::GRAY), egui::StrokeKind::Outside);
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index 40498422..3304b516 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -10,7 +10,7 @@ use std::sync::Arc;
 use deckcraft_geom::Rect;
 use deckcraft_model::{Master, Presentation, ShapeId, Slide};
 use deckcraft_render::{Image, Region, RenderOpts};
-use egui::{ColorImage, TextureHandle, TextureOptions};
+use egui::{ColorImage, TextureFilter, TextureHandle, TextureOptions, TextureWrapMode};
 
 #[derive(Clone, PartialEq)]
 struct Key {
@@ -50,6 +50,39 @@ pub struct Textures {
     pub last_render_ms: f64,
 }
 
+/// Snap `rect` onto the physical pixel grid.
+///
+/// The editor draws the slide as a texture of device pixels. A rect that starts or ends
+/// between pixels is sampled with a linear filter, so every glyph edge is a blend of two
+/// texels and small text looks soft. On a Retina display that offset is half a point, which
+/// is the whole edge of an editing-size glyph. The slide show draws much larger glyphs, so
+/// the same blend is not visible there (#184).
+pub fn device_pixel_rect(rect: egui::Rect, ppp: f32) -> egui::Rect {
+    if !ppp.is_finite() || ppp <= 0.0 || !rect.is_finite() {
+        return rect;
+    }
+    let snap = |v: f32| {
+        let p = v * ppp;
+        if p.is_finite() { p.round() / ppp } else { v }
+    };
+    let min = egui::pos2(snap(rect.min.x), snap(rect.min.y));
+    let step = 1.0 / ppp;
+    let max = egui::pos2(snap(rect.max.x).max(min.x + step), snap(rect.max.y).max(min.y + step));
+    egui::Rect::from_min_max(min, max)
+}
+
+/// Editor slide textures. Nearest magnification keeps a texel that is stretched by a
+/// fraction of a pixel from blurring the glyph; minification still blends when many texels
+/// share a screen pixel.
+pub fn editor_texture_options() -> TextureOptions {
+    TextureOptions {
+        magnification: TextureFilter::Nearest,
+        minification: TextureFilter::Linear,
+        wrap_mode: TextureWrapMode::ClampToEdge,
+        mipmap_mode: None,
+    }
+}
+
 pub fn to_color_image(img: &Image, grayscale: bool) -> ColorImage {
     let w = img.width as usize;
     let h = img.height as usize;
@@ -153,10 +186,10 @@ impl Textures {
         let ci = to_color_image(&img, grayscale);
         let tex = match self.canvas.take() {
             Some(mut e) => {
-                e.tex.set(ci, TextureOptions::LINEAR);
+                e.tex.set(ci, editor_texture_options());
                 e.tex
             }
-            None => ctx.load_texture("slide-canvas", ci, TextureOptions::LINEAR),
+            None => ctx.load_texture("slide-canvas", ci, editor_texture_options()),
         };
         self.canvas = Some(Entry { key, tex: tex.clone(), region, _slide: slide, _master: master, stamp: 0 });
         Some((tex, region))
@@ -199,7 +232,7 @@ impl Textures {
         *budget -= 1;
         let scale = width_px as f64 / p.slide_size.width.max(1.0);
         let img = deckcraft_render::render_slide(p, index, &RenderOpts { scale, size: Some((width_px, h)), threads: 0, ..Default::default() });
-        let tex = ctx.load_texture(format!("thumb-{index}"), to_color_image(&img, false), TextureOptions::LINEAR);
+        let tex = ctx.load_texture(format!("thumb-{index}"), to_color_image(&img, false), editor_texture_options());
         // Drop the old entry for this slide address; entries for slides that no longer exist age out.
         let region = key.want;
         self.thumbs.insert(key.slide, Entry { key, tex: tex.clone(), region, _slide: slide, _master: master, stamp: clock });
@@ -213,3 +246,36 @@ impl Textures {
         Some(tex)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::device_pixel_rect;
+    use egui::{Rect, pos2, vec2};
+
+    fn on_grid(v: f32, ppp: f32) -> bool {
+        let px = v * ppp;
+        (px - px.round()).abs() < 1e-3
+    }
+
+    #[test]
+    fn a_retina_slide_rect_lands_on_device_pixels() {
+        let ppp = 2.0;
+        let r = Rect::from_min_size(pos2(10.3, 20.25), vec2(100.2, 50.4));
+        let s = device_pixel_rect(r, ppp);
+        assert!(on_grid(s.min.x, ppp) && on_grid(s.min.y, ppp) && on_grid(s.max.x, ppp) && on_grid(s.max.y, ppp));
+        assert!(s.width() > 0.0 && s.height() > 0.0);
+        // One texture pixel per device pixel: the snapped size is an integer pixel count.
+        let px = ((s.width() * ppp).round() as u32, (s.height() * ppp).round() as u32);
+        assert!((s.width() / px.0 as f32 * ppp - 1.0).abs() < 1e-3);
+        assert!((s.height() / px.1 as f32 * ppp - 1.0).abs() < 1e-3);
+        let aligned = Rect::from_min_max(pos2(1.0, 2.5), pos2(80.0, 40.0));
+        assert_eq!(device_pixel_rect(aligned, ppp), aligned);
+    }
+
+    #[test]
+    fn a_bad_scale_does_not_move_the_rect() {
+        let r = Rect::from_min_size(pos2(3.0, 4.0), vec2(10.0, 12.0));
+        assert_eq!(device_pixel_rect(r, 0.0), r);
+        assert_eq!(device_pixel_rect(r, f32::NAN), r);
+    }
+}
diff --git a/crates/ui-egui/src/thumbs.rs b/crates/ui-egui/src/thumbs.rs
index ebdc81d0..38e6d4ca 100644
--- a/crates/ui-egui/src/thumbs.rs
+++ b/crates/ui-egui/src/thumbs.rs
@@ -86,7 +86,7 @@ fn list(app: &mut SlideApp, ui: &mut Ui) {
             });
         }
         let (row, resp) = ui.allocate_exact_size(vec2(width, th + 16.0), Sense::click_and_drag());
-        let img = Rect::from_min_size(pos2(row.min.x + 30.0, row.min.y + 6.0), vec2(tw, th));
+        let img = crate::textures::device_pixel_rect(Rect::from_min_size(pos2(row.min.x + 30.0, row.min.y + 6.0), vec2(tw, th)), ppp);
         rects.push((i, row));
         let p = ui.painter();
         let id = doc.slides.get(i).map(|s| s.id);
@@ -106,7 +106,7 @@ fn list(app: &mut SlideApp, ui: &mut Ui) {
         if has_anim {
             p.text(pos2(row.min.x + 14.0, img.min.y + 20.0), Align2::CENTER_TOP, "★", theme::font(10.0), t.text_faint);
         }
-        let wpx = (tw * ppp).round() as u32;
+        let wpx = (img.width() * ppp).round() as u32;
         match app.textures.thumb(ui.ctx(), &doc, i, wpx, &mut budget) {
             Some(tex) => {
                 p.image(
@@ -268,9 +268,9 @@ fn master_list(app: &mut SlideApp, ui: &mut Ui) {
                 let tw = (width - indent - 14.0).max(40.0) * if li.is_some() { 0.8 } else { 1.0 };
                 let th = tw * (doc.slide_size.height / doc.slide_size.width.max(1.0)) as f32;
                 let (row, resp) = ui.allocate_exact_size(vec2(width, th + 12.0), Sense::click());
-                let img = Rect::from_min_size(pos2(row.min.x + indent, row.min.y + 4.0), vec2(tw, th));
                 let ppp = ui.ctx().pixels_per_point();
-                let px = ((tw * ppp) as u32).max(1);
+                let img = crate::textures::device_pixel_rect(Rect::from_min_size(pos2(row.min.x + indent, row.min.y + 4.0), vec2(tw, th)), ppp);
+                let px = ((img.width() * ppp).round() as u32).max(1);
                 let pic = deckcraft_render::render_layout(
                     &doc,
                     mi,
@@ -282,8 +282,11 @@ fn master_list(app: &mut SlideApp, ui: &mut Ui) {
                         ..Default::default()
                     },
                 );
-                let tex =
-                    ui.ctx().load_texture(format!("ml-{mi}-{li:?}"), crate::textures::to_color_image(&pic, false), egui::TextureOptions::LINEAR);
+                let tex = ui.ctx().load_texture(
+                    format!("ml-{mi}-{li:?}"),
+                    crate::textures::to_color_image(&pic, false),
+                    crate::textures::editor_texture_options(),
+                );
                 ui.painter().image(tex.id(), img, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
                 let selected = match (target, li) {
                     (Target::Master { master }, None) => master == mi,
diff --git a/docs/hardware-parity.md b/docs/hardware-parity.md
index 5ba34cfc..42747bd6 100644
--- a/docs/hardware-parity.md
+++ b/docs/hardware-parity.md
@@ -1,6 +1,6 @@
 # Hardware parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (editor rasters on the Retina pixel grid, #184; previous: IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 
 What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
 ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -13,7 +13,7 @@ because it mostly follows from hardware use.
 | Window compositing on the GPU | Metal / DirectX | wgpu (Metal) | wgpu, DX12 only by default (#16) | wgpu (Vulkan, GL) | WebGPU, WebGL2 fallback |
 | Slide rasterization | GPU | **CPU** (`vello_cpu`) | CPU | CPU | CPU (wasm) |
 | Transitions and Morph frames | GPU | CPU-rendered slide images composited as textured quads on the GPU | same | same | same |
-| High-DPI / Retina | yes | yes | yes | yes | yes |
+| High-DPI / Retina | yes | yes; editor slide rasters sit on the physical pixel grid (#184) | yes | yes | yes |
 | Wide gamut / HDR display | partly (P3 images) | no (sRGB) | no | no | no |
 | Startup on all GPUs | yes | yes | **no**: crashes in some Intel/AMD drivers (#40, #59) | not reported | n/a |
 | Software fallback when no GPU | yes (WARP on Windows) | no | no | no | no |
@@ -71,5 +71,6 @@ outlines every frame (#67, fix open), and the decoders run in software.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Editor slide rasters sit on the physical pixel grid (#184) |
 | 2026-10-12 | minor | IME input methods (#101) |
 | 2026-10-10 | major | Created: rendering, media, displays, input and performance against PowerPoint 16.113 |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..76580bad 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (editor slide rasters sit on the physical pixel grid, #184; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -128,8 +128,10 @@ Alt+Shift+arrows in text are handled elsewhere (#78, #93).
 
 Colours, spacing, ribbon card and tab geometry follow the observations in
 `plan/powerpoint/01-observed-ui.md`; icons are original (~240, drawn in code or Lucide) and must not
-imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been run since
-2026-10-07. Cross-app icon consistency is open (#73, #56).
+imitate Microsoft's. The editing canvas, thumbnails and layout previews are drawn on the physical
+pixel grid, so a Retina display does not blur them between pixels (#184). No pixel comparison
+against PowerPoint screenshots has been run since 2026-10-07. Cross-app icon consistency is open
+(#73, #56).
 
 ## Estimates
 
@@ -148,6 +150,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Editor slide rasters sit on the physical pixel grid (#184) |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 5acf9eeebf13277c75b4751ae3e2b3d2d0cf21f2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:49:55 +0300
Subject: [PATCH 163/376] Review: compare with a revised copy and accept its
 slides
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

review.compare {path | name, data} reads a revised presentation (native or
PPTX) and lists slide-level revisions against the open one: inserted,
deleted and changed slides, with what changed (text, text formatting,
moved, resized, rotated, formatting, picture, objects inserted/deleted,
layout, notes, transition, animations, background, hidden). Slides match by
id, or by position when the decks share none (fixed for the session so
accepting doesn't switch the matching half way). Shapes match by id, then
name.

review.accept {index | all} applies revisions as one undo step: a revised
slide's media is copied (remapped on an id clash), its shape ids kept unless
another slide uses them (animations follow), its layout matched by id, then
name. review.revisions and review.endCompare complete the set.

Review tab: Compare (file picker), Accept All, End Review; the Revisions pane
lists changes with Go-to and Accept. Parity row: Compare presentations M → P.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/edit.rs       |   2 +-
 crates/engine/src/cmd/review.rs     |  81 +++++
 crates/engine/src/compare.rs        | 449 ++++++++++++++++++++++++++++
 crates/engine/src/lib.rs            |   4 +
 crates/ui-egui/src/compare_tests.rs |  61 ++++
 crates/ui-egui/src/lib.rs           |  14 +
 crates/ui-egui/src/panes.rs         |  57 ++++
 crates/ui-egui/src/ribbon.rs        |  13 +
 docs/gaps.md                        |   3 +-
 docs/parity-checklist.md            |   6 +-
 10 files changed, 685 insertions(+), 5 deletions(-)
 create mode 100644 crates/engine/src/compare.rs
 create mode 100644 crates/ui-egui/src/compare_tests.rs

diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 30437b15..229296c0 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -48,7 +48,7 @@ fn slides_scope(s: &Session, p: &Value) -> bool {
         || s.active().is_some_and(|d| d.selection.shapes.is_empty() && d.selection.text.is_none() && !d.selection.slides.is_empty())
 }
 
-fn media_of_shapes(shapes: &[Shape], out: &mut Vec<MediaId>) {
+pub(crate) fn media_of_shapes(shapes: &[Shape], out: &mut Vec<MediaId>) {
     deckcraft_model::walk(shapes, &mut |s, _| {
         match &s.kind {
             deckcraft_model::ShapeKind::Picture { fill } => out.push(fill.media),
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 8e3a532c..b9f25d40 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -16,6 +16,10 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("comment.resolve", "Resolve Thread", ["Comments"], None, "{index, resolved?: bool}", has_slide, resolve),
         cmd!(query "comment.list", "Comments", [], None, "{slide?} → comments", has_slide, list),
         cmd!(query "review.accessibility", "Check Accessibility", ["Review", "Accessibility"], None, "{} → [{slide, shape, issue}]", has_doc, accessibility),
+        cmd!(noundo "review.compare", "Compare", ["Review", "Compare"], None, "{path} | {name, data: base64} — compare with a revised copy → {name, changes}", has_doc, compare),
+        cmd!(query "review.revisions", "Revisions", [], None, "{} → {name, changes: [{kind: inserted|deleted|changed, slide, revised, details}]}", has_doc, revisions),
+        cmd!("review.accept", "Accept Revision", ["Review", "Compare"], None, "{index} | {all: true}", comparing, accept),
+        cmd!(noundo "review.endCompare", "End Review", ["Review", "Compare"], None, "{}", comparing, end_compare),
         cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{} → [{slide, shape, word}] (words not in the built-in list)", has_doc, spelling),
         cmd!(noundo "show.fromStart", "Play from Start", ["Slide Show", "Start Slide Show"], Some("Cmd+Shift+Enter"), "{}", has_slide, |s, _| start(s, 0)),
         cmd!(noundo "show.fromCurrent", "Play from Current Slide", ["Slide Show", "Start Slide Show"], Some("Cmd+Enter"), "{}", has_slide, |s, _| {
@@ -264,3 +268,80 @@ fn custom_show(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     ok()
 }
+
+fn comparing(s: &Session) -> std::result::Result<(), String> {
+    if s.active().is_some_and(|d| d.compare.is_some()) { Ok(()) } else { Err("not comparing".into()) }
+}
+
+fn revised_bytes(p: &Value) -> Result<(String, Vec<u8>)> {
+    if let Some(data) = str_param(p, "data") {
+        let bytes = base64_decode(data).ok_or_else(|| bad("review.compare", "invalid base64 `data`"))?;
+        return Ok((str_param(p, "name").unwrap_or("Revised").to_string(), bytes));
+    }
+    #[cfg(not(target_arch = "wasm32"))]
+    if let Some(path) = str_param(p, "path") {
+        let bytes = std::fs::read(path).map_err(|e| crate::EngineError::Other(format!("{path}: {e}")))?;
+        return Ok((path.to_string(), bytes));
+    }
+    Err(bad("review.compare", "give `path` or `data`"))
+}
+
+fn revisions_json(st: &crate::DocState) -> Result<Value> {
+    let c = st.compare.as_ref().ok_or_else(|| bad("review.revisions", "not comparing"))?;
+    let name = std::path::Path::new(&c.name).file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_else(|| c.name.clone());
+    Ok(json!({"name": name, "changes": crate::compare::diff(&st.doc, &c.revised, c.by_position), "byPosition": c.by_position}))
+}
+
+fn compare(s: &mut Session, p: &Value) -> Result<Value> {
+    let (name, bytes) = revised_bytes(p)?;
+    let revised = super::file::open_presentation(&name, &bytes)?;
+    let st = s.doc_mut()?;
+    let by_position = crate::compare::unrelated(&st.doc, &revised);
+    st.compare = Some(crate::compare::Compare { name, revised: Arc::new(revised), by_position });
+    s.ui_requests.push(UiRequest::Pane { id: "revisions".into() });
+    revisions_json(s.doc()?)
+}
+
+fn revisions(s: &mut Session, _: &Value) -> Result<Value> {
+    revisions_json(s.doc()?)
+}
+
+fn accept(s: &mut Session, p: &Value) -> Result<Value> {
+    let (rev, by_pos) = s.doc()?.compare.as_ref().map(|c| (c.revised.clone(), c.by_position)).ok_or_else(|| bad("review.accept", "not comparing"))?;
+    let all = bool_param(p, "all").unwrap_or(false);
+    let index = usize_param(p, "index");
+    if !all && index.is_none() {
+        return Err(bad("review.accept", "give `index` or `all`"));
+    }
+    s.edit(|doc, sel| {
+        let mut accepted = 0usize;
+        // Each accept shifts indices, so the list is recomputed; bounded by the slide counts.
+        let limit = doc.slides.len().saturating_add(rev.slides.len()).saturating_add(1);
+        for _ in 0..limit {
+            let changes = crate::compare::diff(doc, &rev, by_pos);
+            let c = if all {
+                changes.into_iter().find(|c| !(c.kind == crate::compare::ChangeKind::Deleted && doc.slides.len() <= 1))
+            } else {
+                changes.into_iter().nth(index.unwrap_or(0))
+            };
+            let Some(c) = c else { break };
+            let Some(at) = crate::compare::accept(doc, &rev, &c) else { break };
+            accepted += 1;
+            sel.slide = at;
+            sel.shapes.clear();
+            sel.text = None;
+            if !all {
+                break;
+            }
+        }
+        if accepted == 0 {
+            return Err(bad("review.accept", "no such revision"));
+        }
+        Ok(json!({"accepted": accepted}))
+    })
+}
+
+fn end_compare(s: &mut Session, _: &Value) -> Result<Value> {
+    s.doc_mut()?.compare = None;
+    ok()
+}
diff --git a/crates/engine/src/compare.rs b/crates/engine/src/compare.rs
new file mode 100644
index 00000000..5d65c0cc
--- /dev/null
+++ b/crates/engine/src/compare.rs
@@ -0,0 +1,449 @@
+//! Review › Compare: the differences between the open presentation and a revised copy of it, slide
+//! by slide, and accepting a revised slide into the open one.
+//!
+//! Slides match by id (a revised copy of the same deck keeps them); when the two decks share no
+//! slide id at all, by position. Shapes match by id, then by name.
+
+use std::collections::{HashMap, HashSet};
+use std::sync::Arc;
+
+use deckcraft_model::{Fill, MediaId, Presentation, Shape, ShapeId, ShapeKind, Slide, SlideId};
+use serde::Serialize;
+
+/// The revised presentation a document is being compared with.
+#[derive(Clone, Debug)]
+pub struct Compare {
+    pub name: String,
+    pub revised: Arc<Presentation>,
+    /// Slides match by position (the decks shared no slide id when the compare started); fixed
+    /// for the session so accepting slides doesn't switch the matching half way.
+    pub by_position: bool,
+}
+
+/// Whether `cur` and `rev` share no slide id (then slides match by position).
+pub fn unrelated(cur: &Presentation, rev: &Presentation) -> bool {
+    let ids: HashSet<SlideId> = rev.slides.iter().map(|s| s.id).collect();
+    !cur.slides.iter().any(|s| ids.contains(&s.id))
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub enum ChangeKind {
+    /// Only in the revised deck.
+    Inserted,
+    /// Only in the open deck.
+    Deleted,
+    /// In both, different.
+    Changed,
+}
+
+/// One slide-level revision.
+#[derive(Clone, Debug, PartialEq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Change {
+    pub kind: ChangeKind,
+    /// Index in the open deck (for inserted: where it would go).
+    pub slide: usize,
+    /// Index in the revised deck (none for deleted).
+    pub revised: Option<usize>,
+    /// What differs, readable: `Title 1: text`, `Picture 3 inserted`, `notes`…
+    pub details: Vec<String>,
+}
+
+const MAX_DETAILS: usize = 50;
+
+/// Slide pairs (open index, revised index).
+fn pairs(cur: &Presentation, rev: &Presentation, by_position: bool) -> Vec<(usize, usize)> {
+    if by_position {
+        return (0..cur.slides.len().min(rev.slides.len())).map(|i| (i, i)).collect();
+    }
+    let rev_ids: HashMap<SlideId, usize> = rev.slides.iter().enumerate().map(|(i, s)| (s.id, i)).collect();
+    cur.slides.iter().enumerate().filter_map(|(i, s)| rev_ids.get(&s.id).map(|j| (i, *j))).collect()
+}
+
+pub fn diff(cur: &Presentation, rev: &Presentation, by_position: bool) -> Vec<Change> {
+    let pairs = pairs(cur, rev, by_position);
+    let cur_matched: HashSet<usize> = pairs.iter().map(|p| p.0).collect();
+    let rev_matched: HashSet<usize> = pairs.iter().map(|p| p.1).collect();
+    let mut out = vec![];
+    for (i, j) in &pairs {
+        let (Some(a), Some(b)) = (cur.slides.get(*i), rev.slides.get(*j)) else { continue };
+        let details = slide_details(cur, a, rev, b);
+        if !details.is_empty() {
+            out.push(Change { kind: ChangeKind::Changed, slide: *i, revised: Some(*j), details });
+        }
+    }
+    for (i, s) in cur.slides.iter().enumerate() {
+        if !cur_matched.contains(&i) {
+            out.push(Change { kind: ChangeKind::Deleted, slide: i, revised: None, details: vec![slide_title(s)] });
+        }
+    }
+    for (j, s) in rev.slides.iter().enumerate() {
+        if !rev_matched.contains(&j) {
+            // After the open slide that matches the revised slide before it.
+            let at = (0..j).rev().find_map(|k| pairs.iter().find(|p| p.1 == k).map(|p| p.0 + 1)).unwrap_or(0);
+            out.push(Change { kind: ChangeKind::Inserted, slide: at, revised: Some(j), details: vec![slide_title(s)] });
+        }
+    }
+    out.sort_by_key(|c| (c.slide, c.revised.unwrap_or(0)));
+    out
+}
+
+fn slide_title(s: &Slide) -> String {
+    let t = s
+        .shapes
+        .iter()
+        .find(|x| x.ph.as_ref().is_some_and(|p| matches!(p.kind, deckcraft_model::PhType::Title | deckcraft_model::PhType::CtrTitle)))
+        .and_then(|x| x.text.as_ref())
+        .map(|b| b.text())
+        .unwrap_or_default();
+    let t = t.trim();
+    if t.is_empty() { "Untitled slide".into() } else { t.chars().take(60).collect() }
+}
+
+fn shape_label(s: &Shape) -> String {
+    if s.name.trim().is_empty() { format!("Shape {}", s.id.0) } else { s.name.clone() }
+}
+
+fn media_bytes(p: &Presentation, id: MediaId) -> Option<&[u8]> {
+    p.media(id).map(|m| m.data.as_slice())
+}
+
+/// A shape without its ids (shape and media), for comparing across decks.
+fn plain_shape(s: &Shape) -> Shape {
+    let mut c = s.clone();
+    fn rec(shapes: &mut [Shape]) {
+        for s in shapes {
+            s.id = ShapeId(0);
+            if let Some(ch) = s.children_mut() {
+                rec(ch);
+            }
+        }
+    }
+    rec(std::slice::from_mut(&mut c));
+    c
+}
+
+fn shape_details(cp: &Presentation, a: &Shape, rp: &Presentation, b: &Shape, out: &mut Vec<String>) {
+    let label = shape_label(b);
+    let text = |s: &Shape| s.text.as_ref().map(|t| t.text()).unwrap_or_default();
+    let mut what = vec![];
+    if text(a) != text(b) {
+        what.push("text");
+    } else if a.text != b.text {
+        what.push("text formatting");
+    }
+    match (&a.xfrm, &b.xfrm) {
+        (Some(x), Some(y)) if (x.x, x.y) != (y.x, y.y) && (x.w, x.h) == (y.w, y.h) => what.push("moved"),
+        (Some(x), Some(y)) if (x.w, x.h) != (y.w, y.h) => what.push("resized"),
+        (x, y) if x.as_ref().map(|x| x.rot) != y.as_ref().map(|y| y.rot) => what.push("rotated"),
+        _ => {}
+    }
+    if a.fill != b.fill || a.line != b.line || a.style != b.style || a.effects != b.effects {
+        what.push("formatting");
+    }
+    let pic = |p: &Presentation, s: &Shape| match &s.kind {
+        ShapeKind::Picture { fill } => media_bytes(p, fill.media).map(|b| b.to_vec()),
+        _ => None,
+    };
+    if pic(cp, a) != pic(rp, b) {
+        what.push("picture");
+    }
+    if what.is_empty() {
+        let (mut x, mut y) = (plain_shape(a), plain_shape(b));
+        x.text = None;
+        y.text = None;
+        if let (ShapeKind::Picture { .. }, ShapeKind::Picture { .. }) = (&x.kind, &y.kind) {
+            x.kind = ShapeKind::Shape;
+            y.kind = ShapeKind::Shape;
+        }
+        if x != y {
+            what.push("properties");
+        }
+    }
+    if !what.is_empty() {
+        out.push(format!("{label}: {}", what.join(", ")));
+    }
+}
+
+fn slide_details(cp: &Presentation, a: &Slide, rp: &Presentation, b: &Slide) -> Vec<String> {
+    let mut out = vec![];
+    let mut used: HashSet<usize> = HashSet::new();
+    for sa in &a.shapes {
+        let k = b
+            .shapes
+            .iter()
+            .position(|x| x.id == sa.id)
+            .or_else(|| b.shapes.iter().enumerate().position(|(k, x)| !used.contains(&k) && x.name == sa.name && !x.name.is_empty()));
+        match k {
+            Some(k) if !used.contains(&k) => {
+                used.insert(k);
+                if let Some(sb) = b.shapes.get(k) {
+                    shape_details(cp, sa, rp, sb, &mut out);
+                }
+            }
+            _ => out.push(format!("{} deleted", shape_label(sa))),
+        }
+    }
+    for (k, sb) in b.shapes.iter().enumerate() {
+        if !used.contains(&k) {
+            out.push(format!("{} inserted", shape_label(sb)));
+        }
+    }
+    let order = |s: &Slide| s.shapes.iter().map(|x| x.name.clone()).collect::<Vec<_>>();
+    if out.is_empty() && order(a) != order(b) {
+        out.push("order of objects".into());
+    }
+    let layout_name = |p: &Presentation, s: &Slide| p.layout(s.layout).map(|(_, l)| l.name.clone());
+    if layout_name(cp, a) != layout_name(rp, b) {
+        out.push("layout".into());
+    }
+    if a.notes.text() != b.notes.text() {
+        out.push("notes".into());
+    }
+    if a.transition != b.transition {
+        out.push("transition".into());
+    }
+    if a.animations.len() != b.animations.len()
+        || a.animations
+            .iter()
+            .zip(&b.animations)
+            .any(|(x, y)| (&x.effect, x.class, x.start, x.duration_ms, x.delay_ms) != (&y.effect, y.class, y.start, y.duration_ms, y.delay_ms))
+    {
+        out.push("animations".into());
+    }
+    if a.background != b.background {
+        out.push("background".into());
+    }
+    if a.hidden != b.hidden {
+        out.push(if b.hidden { "hidden" } else { "shown" }.into());
+    }
+    out.truncate(MAX_DETAILS);
+    out
+}
+
+fn max_shape_id(shapes: &[Shape], m: &mut u32) {
+    deckcraft_model::walk(shapes, &mut |s, _| *m = (*m).max(s.id.0));
+}
+
+/// The revised slide made to live in `doc`: its media copied over (remapped on an id clash), shape
+/// ids kept unless another slide of `doc` uses them (then fresh, animations following), and its
+/// layout matched by id, then by name, then the first layout.
+pub fn adopt(doc: &mut Presentation, rev: &Presentation, slide: &Slide, replacing: Option<SlideId>) -> Slide {
+    let mut sl = slide.clone();
+    // Media.
+    let mut mids = vec![];
+    crate::cmd::edit::media_of_shapes(&sl.shapes, &mut mids);
+    let mut media_map: HashMap<MediaId, MediaId> = HashMap::new();
+    for id in mids {
+        let Some(m) = rev.media(id) else { continue };
+        match doc.media(id) {
+            Some(x) if x.data == m.data => {}
+            None => doc.media.push(m.clone()),
+            Some(_) => {
+                let new = doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone());
+                media_map.insert(id, new);
+            }
+        }
+    }
+    // Shape ids used elsewhere in the open deck.
+    let mut taken: HashSet<u32> = HashSet::new();
+    for s in doc.slides.iter().filter(|s| Some(s.id) != replacing) {
+        deckcraft_model::walk(&s.shapes, &mut |x, _| {
+            taken.insert(x.id.0);
+        });
+    }
+    let mut id_map: HashMap<ShapeId, ShapeId> = HashMap::new();
+    fn rec(
+        doc: &mut Presentation,
+        shapes: &mut [Shape],
+        taken: &HashSet<u32>,
+        ids: &mut HashMap<ShapeId, ShapeId>,
+        media: &HashMap<MediaId, MediaId>,
+        depth: usize,
+    ) {
+        if depth > 64 {
+            return;
+        }
+        for s in shapes {
+            if taken.contains(&s.id.0) {
+                let new = ShapeId(doc.alloc_id());
+                ids.insert(s.id, new);
+                s.id = new;
+            }
+            let remap = |m: &mut MediaId| {
+                if let Some(n) = media.get(m) {
+                    *m = *n;
+                }
+            };
+            match &mut s.kind {
+                ShapeKind::Picture { fill } => remap(&mut fill.media),
+                ShapeKind::Media(m) => {
+                    remap(&mut m.media);
+                    if let Some(p) = m.poster.as_mut() {
+                        remap(p);
+                    }
+                }
+                _ => {}
+            }
+            if let Some(Fill::Picture(pf)) = &mut s.fill {
+                remap(&mut pf.media);
+            }
+            if let Some(ch) = s.children_mut() {
+                rec(doc, ch, taken, ids, media, depth + 1);
+            }
+        }
+    }
+    rec(doc, &mut sl.shapes, &taken, &mut id_map, &media_map, 0);
+    for a in &mut sl.animations {
+        if let Some(n) = id_map.get(&a.shape) {
+            a.shape = *n;
+        }
+        if let Some(t) = a.trigger.as_mut()
+            && let Some(n) = id_map.get(t)
+        {
+            *t = *n;
+        }
+    }
+    let mut max = 0;
+    max_shape_id(&sl.shapes, &mut max);
+    doc.next_id = doc.next_id.max(max);
+    // Layout.
+    if doc.layout(sl.layout).is_none() {
+        let name = rev.layout(slide.layout).map(|(_, l)| l.name.clone());
+        let by_name = name.and_then(|n| doc.masters.iter().flat_map(|m| &m.layouts).find(|l| l.name == n).map(|l| l.id));
+        sl.layout = by_name.or_else(|| doc.masters.first().and_then(|m| m.layouts.first()).map(|l| l.id)).unwrap_or_default();
+    }
+    match replacing {
+        Some(id) => sl.id = id,
+        None => {
+            if doc.slides.iter().any(|s| s.id == sl.id) || sl.id.0 == 0 {
+                sl.id = SlideId(doc.alloc_id());
+            }
+            doc.next_id = doc.next_id.max(sl.id.0);
+        }
+    }
+    sl
+}
+
+/// Apply `change` (from [`diff`] of `doc` against `rev`) to `doc`. Returns the slide index to show.
+pub fn accept(doc: &mut Presentation, rev: &Presentation, change: &Change) -> Option<usize> {
+    match change.kind {
+        ChangeKind::Changed => {
+            let b = rev.slides.get(change.revised?)?.clone();
+            let id = doc.slides.get(change.slide)?.id;
+            let sl = adopt(doc, rev, &b, Some(id));
+            *doc.slides.get_mut(change.slide)? = Arc::new(sl);
+            Some(change.slide)
+        }
+        ChangeKind::Inserted => {
+            let b = rev.slides.get(change.revised?)?.clone();
+            let sl = adopt(doc, rev, &b, None);
+            let at = change.slide.min(doc.slides.len());
+            doc.slides.insert(at, Arc::new(sl));
+            Some(at)
+        }
+        ChangeKind::Deleted => {
+            if change.slide >= doc.slides.len() || doc.slides.len() <= 1 {
+                return None;
+            }
+            doc.slides.remove(change.slide);
+            Some(change.slide.min(doc.slides.len().saturating_sub(1)))
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use serde_json::{Value, json};
+
+    use crate::Session;
+
+    /// The sample deck, and a revised copy of it as base64 `.deckcraft` bytes: slide 1's title
+    /// retyped, slide 2 deleted, a new slide at the end, a shape moved on slide 3.
+    fn decks() -> (Session, String, usize) {
+        let mut s = Session::new();
+        crate::sample::open_sample(&mut s).unwrap();
+        let n = s.doc().unwrap().doc.slides.len();
+        let orig = s.execute("file.saveBytes", &json!({})).unwrap()["data"].as_str().unwrap().to_string();
+        // Make the revision in a second document.
+        s.execute("file.openBytes", &json!({"name": "rev.deckcraft", "data": orig})).unwrap();
+        let first = s.doc().unwrap().doc.slides[0].shapes.iter().find(|x| x.text.is_some()).unwrap().id.0;
+        s.execute("edit.select", &json!({"ids": [first]})).unwrap();
+        s.execute("text.edit", &json!({"id": first})).unwrap();
+        s.execute("edit.selectAll", &json!({})).unwrap();
+        s.execute("text.insert", &json!({"text": "Revised title"})).unwrap();
+        s.execute("text.exit", &json!({})).unwrap();
+        s.execute("slide.delete", &json!({"index": 1})).unwrap();
+        s.execute("slide.go", &json!({"index": 1})).ok();
+        let moved = s.doc().unwrap().doc.slides[1].shapes[0].id.0;
+        s.execute("shape.move", &json!({"ids": [moved], "dx": 30, "dy": 0})).ok();
+        s.execute("slide.go", &json!({"index": n - 2})).ok();
+        s.execute("slide.new", &json!({"layout": "titleAndContent", "title": "Brand new", "body": "x"})).unwrap();
+        let rev = s.execute("file.saveBytes", &json!({})).unwrap()["data"].as_str().unwrap().to_string();
+        s.close_document(1);
+        s.set_active(0);
+        (s, rev, n)
+    }
+
+    fn kinds(v: &Value) -> Vec<String> {
+        v["changes"].as_array().unwrap().iter().map(|c| c["kind"].as_str().unwrap().to_string()).collect()
+    }
+
+    #[test]
+    fn lists_inserted_deleted_and_changed_slides() {
+        let (mut s, rev, n) = decks();
+        let v = s.execute("review.compare", &json!({"name": "rev.deckcraft", "data": rev})).unwrap();
+        let k = kinds(&v);
+        assert!(k.contains(&"deleted".into()) && k.contains(&"inserted".into()) && k.contains(&"changed".into()), "{v}");
+        let ch = &v["changes"].as_array().unwrap()[0];
+        assert_eq!(ch["slide"], 0);
+        assert!(ch["details"].to_string().contains("text"), "{ch}");
+        let ins = v["changes"].as_array().unwrap().iter().find(|c| c["kind"] == "inserted").unwrap();
+        assert_eq!(ins["details"][0], "Brand new");
+        let at = ins["slide"].as_u64().unwrap() as usize;
+        assert_eq!(at, n, "after the open slide matching the revised one before it");
+        assert_eq!(s.doc().unwrap().doc.slides.len(), n, "comparing alone changes nothing");
+    }
+
+    #[test]
+    fn accept_one_then_all_makes_the_decks_equal_and_undoes() {
+        let (mut s, rev, n) = decks();
+        s.execute("review.compare", &json!({"name": "rev.deckcraft", "data": rev})).unwrap();
+        let before = s.execute("review.revisions", &json!({})).unwrap()["changes"].as_array().unwrap().len();
+        s.execute("review.accept", &json!({"index": 0})).unwrap();
+        let after = s.execute("review.revisions", &json!({})).unwrap()["changes"].as_array().unwrap().len();
+        assert_eq!(after, before - 1);
+        assert!(s.doc().unwrap().doc.slides[0].shapes.iter().any(|x| x.text.as_ref().is_some_and(|t| t.text().contains("Revised title"))));
+        s.execute("review.accept", &json!({"all": true})).unwrap();
+        let left = s.execute("review.revisions", &json!({})).unwrap();
+        assert!(left["changes"].as_array().unwrap().is_empty(), "{left}");
+        assert!(s.doc().unwrap().doc.validate().is_empty(), "{:?}", s.doc().unwrap().doc.validate());
+        assert_eq!(s.doc().unwrap().doc.slides.len(), n);
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(s.execute("review.revisions", &json!({})).unwrap()["changes"].as_array().unwrap().len(), before);
+        s.execute("review.endCompare", &json!({})).unwrap();
+        assert!(s.execute("review.revisions", &json!({})).is_err());
+        assert!(s.execute("review.accept", &json!({"all": true})).is_err());
+    }
+
+    #[test]
+    fn unrelated_decks_match_by_position_and_bad_input_fails() {
+        let mut s = Session::with_new();
+        s.execute("slide.new", &json!({"layout": "title", "title": "A"})).unwrap();
+        let mut other = Session::with_new();
+        other.execute("slide.new", &json!({"layout": "title", "title": "B"})).unwrap();
+        other.execute("slide.new", &json!({"layout": "title", "title": "C"})).unwrap();
+        let data = other.execute("file.saveBytes", &json!({"format": "pptx"})).unwrap()["data"].as_str().unwrap().to_string();
+        let v = s.execute("review.compare", &json!({"name": "o.pptx", "data": data})).unwrap();
+        assert!(kinds(&v).contains(&"inserted".into()), "{v}");
+        s.execute("review.accept", &json!({"all": true})).unwrap();
+        assert!(s.execute("review.revisions", &json!({})).unwrap()["changes"].as_array().unwrap().is_empty());
+        assert!(s.doc().unwrap().doc.validate().is_empty());
+        assert!(s.execute("review.compare", &json!({"data": "!!"})).is_err());
+        assert!(s.execute("review.compare", &json!({"name": "x.bin", "data": "AAAA"})).is_err());
+        assert!(s.execute("review.compare", &json!({})).is_err());
+        assert!(s.execute("review.accept", &json!({"index": 999})).is_err());
+    }
+}
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..2c4df3cd 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -8,6 +8,7 @@
 #![forbid(unsafe_code)]
 
 pub mod cmd;
+pub mod compare;
 pub mod connect;
 pub mod fonts;
 pub mod guard;
@@ -173,6 +174,8 @@ pub struct DocState {
     pub missing_fonts: Vec<String>,
     /// An input method's composition in progress ([`Composition`]).
     pub composition: Option<Composition>,
+    /// Review › Compare in progress: the revised copy.
+    pub compare: Option<compare::Compare>,
 }
 
 static NEXT_UID: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(1);
@@ -192,6 +195,7 @@ impl DocState {
             title,
             missing_fonts: Vec::new(),
             composition: None,
+            compare: None,
         }
     }
     pub fn is_dirty(&self) -> bool {
diff --git a/crates/ui-egui/src/compare_tests.rs b/crates/ui-egui/src/compare_tests.rs
new file mode 100644
index 00000000..9108b4de
--- /dev/null
+++ b/crates/ui-egui/src/compare_tests.rs
@@ -0,0 +1,61 @@
+//! Review › Compare: the Revisions pane lists a revised copy's changes and accepts them.
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+/// The sample deck compared with a copy whose slide 2 is gone and that has a new last slide.
+fn harness() -> (Harness<'static, SlideApp>, usize) {
+    let mut s = Session::new();
+    deckcraft_engine::sample::open_sample(&mut s).unwrap();
+    let n = s.doc().unwrap().doc.slides.len();
+    let data = s.execute("file.saveBytes", &json!({})).unwrap()["data"].as_str().unwrap().to_string();
+    s.execute("file.openBytes", &json!({"name": "rev.deckcraft", "data": data})).unwrap();
+    s.execute("slide.delete", &json!({"index": 1})).unwrap();
+    s.execute("slide.go", &json!({"index": n - 2})).unwrap();
+    s.execute("slide.new", &json!({"layout": "titleAndContent", "title": "From the reviewer", "body": "x"})).unwrap();
+    let rev = s.execute("file.saveBytes", &json!({})).unwrap()["data"].as_str().unwrap().to_string();
+    s.close_document(1);
+    s.set_active(0);
+    s.execute("review.compare", &json!({"name": "Q3 review.deckcraft", "data": rev})).unwrap();
+    let app = SlideApp::new(s, Services::default());
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(4);
+    (h, n)
+}
+
+#[test]
+fn pane_opens_lists_changes_and_accept_all_applies_them() {
+    let (mut h, n) = harness();
+    assert_eq!(h.state().ui.pane.as_deref(), Some("revisions"), "compare opens the Revisions pane");
+    assert!(h.query_by_label("Compared with Q3 review.deckcraft").is_some());
+    assert!(h.query_by_label("Slide 2 deleted").is_some());
+    assert!(h.query_by_label_contains("Slide inserted after").is_some());
+    h.get_by_label_contains("Accept All").click();
+    h.run_steps(3);
+    let st = h.state().session.active().unwrap();
+    assert_eq!(st.doc.slides.len(), n, "one slide gone, one slide added");
+    assert!(h.query_by_label("No differences left.").is_some());
+    h.get_by_label("End Review").click();
+    h.run_steps(3);
+    assert!(h.state().session.active().unwrap().compare.is_none());
+}
+
+#[test]
+#[ignore = "writes a screenshot for review"]
+fn screenshot() {
+    let (mut h, _) = harness();
+    // Review tab.
+    h.state_mut().ui.tab = "Review".into();
+    h.run_steps(4);
+    h.render().unwrap().save("/tmp/compare.png").unwrap();
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..9f28b35d 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -167,6 +167,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.insertVideoDialog", "Video from File…", None, "{}"),
     ("app.saveAsDialog", "Save As…", None, "{}"),
     ("app.exportDialog", "Export…", None, "{}"),
+    ("app.compareDialog", "Compare…", None, "{}"),
     ("app.dialog", "Open Dialog", None, "{id}"),
     ("app.links", "Community Links", None, "{}"),
 ];
@@ -541,6 +542,17 @@ impl SlideApp {
             "app.insertVideoDialog" => self.pick_and_insert("video", "insert.video"),
             "app.saveAsDialog" => self.save_as_dialog("deckcraft"),
             "app.exportDialog" => self.dialog = Some(dialogs::Dialog::new("export")),
+            "app.compareDialog" => {
+                if self.session.active().is_none() {
+                    return Err("open the presentation to compare first".into());
+                }
+                if self.services.pick_open.is_some() {
+                    self.pick_and_insert("open", "review.compare");
+                } else {
+                    // The browser's asynchronous picker would open the file as a new document.
+                    self.set_status("Compare needs the desktop app for now".to_string());
+                }
+            }
             "app.dialog" => {
                 let d = p.get("id").and_then(Value::as_str).ok_or("missing `id`")?;
                 self.dialog = Some(dialogs::Dialog::new(d));
@@ -1127,6 +1139,8 @@ fn js_now() -> f64 {
     js_sys::Date::now()
 }
 
+#[cfg(test)]
+mod compare_tests;
 #[cfg(test)]
 mod ime_tests;
 
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..fac96b69 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -27,6 +27,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                 "selection" => "Selection",
                 "comments" => "Comments",
                 "designer" => "Design Ideas",
+                "revisions" => "Revisions",
                 _ => "Pane",
             };
             ui.horizontal(|ui| {
@@ -50,6 +51,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                 "selection" => crate::selpane::show(app, ui),
                 "comments" => comments(app, ui),
                 "designer" => designer(app, ui),
+                "revisions" => revisions(app, ui),
                 _ => {}
             });
         });
@@ -549,6 +551,61 @@ fn animation(app: &mut SlideApp, ui: &mut Ui) {
     let _ = Stroke::NONE;
 }
 
+/// Review › Compare: the revised copy's slide-level changes; click to go there, Accept to take it.
+fn revisions(app: &mut SlideApp, ui: &mut Ui) {
+    let t = Tokens::get(ui.ctx());
+    let Ok(v) = app.session.execute("review.revisions", &json!({})) else {
+        ui.label(egui::RichText::new("Compare this presentation with a revised copy from Review › Compare.").color(t.text_dim));
+        return;
+    };
+    let changes = v["changes"].as_array().cloned().unwrap_or_default();
+    ui.label(egui::RichText::new(format!("Compared with {}", v["name"].as_str().unwrap_or("?"))).color(t.text_dim));
+    if v["byPosition"].as_bool() == Some(true) {
+        ui.label(egui::RichText::new("Not a copy of this presentation: slides are matched by position.").size(11.0).color(t.text_faint));
+    }
+    ui.add_space(4.0);
+    if changes.is_empty() {
+        ui.label("No differences left.");
+        if ui.button("End Review").clicked() {
+            run(app, "review.endCompare", json!({}));
+            app.ui.pane = None;
+        }
+        return;
+    }
+    if ui.button(format!("Accept All ({})", changes.len())).clicked() {
+        run(app, "review.accept", json!({"all": true}));
+    }
+    ui.separator();
+    for (i, c) in changes.iter().enumerate() {
+        let slide = c["slide"].as_u64().unwrap_or(0);
+        let (head, col) = match c["kind"].as_str().unwrap_or("") {
+            "inserted" => (format!("Slide inserted after {slide}"), Color32::from_rgb(0x2E, 0xA3, 0x6F)),
+            "deleted" => (format!("Slide {} deleted", slide.saturating_add(1)), Color32::from_rgb(0xD8, 0x3F, 0x6B)),
+            _ => (format!("Slide {} changed", slide.saturating_add(1)), Color32::from_rgb(0x2E, 0x6F, 0xD8)),
+        };
+        egui::Frame::NONE.fill(t.chrome).corner_radius(CornerRadius::same(6)).inner_margin(egui::Margin::same(8)).show(ui, |ui| {
+            ui.set_width(ui.available_width());
+            ui.horizontal(|ui| {
+                let (r, _) = ui.allocate_exact_size(vec2(4.0, 16.0), Sense::hover());
+                ui.painter().rect_filled(r, CornerRadius::same(2), col);
+                if ui.link(egui::RichText::new(&head).font(theme::bold(12.5))).clicked() {
+                    let max = app.session.active().map(|d| d.doc.slides.len().saturating_sub(1)).unwrap_or(0);
+                    run(app, "slide.go", json!({"index": (slide as usize).min(max)}));
+                }
+                ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                    if ui.small_button("Accept").clicked() {
+                        run(app, "review.accept", json!({"index": i}));
+                    }
+                });
+            });
+            for d in c["details"].as_array().into_iter().flatten().filter_map(Value::as_str).take(8) {
+                ui.label(egui::RichText::new(format!("• {d}")).size(11.5).color(t.text_dim));
+            }
+        });
+        ui.add_space(4.0);
+    }
+}
+
 fn comments(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
     if ui.button("+ New Comment").clicked() {
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..e4670704 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1791,6 +1791,19 @@ fn review(app: &mut SlideApp, ui: &mut Ui) {
         let _ = r.on_hover_text("Translation needs a language model (not bundled)");
         big(app, ui, Icon::Language, "Language", "app.dialog", json!({"id": "language"}));
     });
+    group(ui, |ui| {
+        big(app, ui, Icon::Compare, "Compare", "app.compareDialog", json!({}));
+        let comparing = enabled(app, "review.endCompare");
+        if big_button(ui, Icon::Check, "Accept\nAll", comparing).clicked() {
+            run(app, "review.accept", json!({"all": true}));
+        }
+        if big_button(ui, Icon::Close, "End\nReview", comparing).clicked() {
+            run(app, "review.endCompare", json!({}));
+            if app.ui.pane.as_deref() == Some("revisions") {
+                app.ui.pane = None;
+            }
+        }
+    });
     group(ui, |ui| {
         big(app, ui, Icon::NewComment, "New\nComment", "app.dialog", json!({"id": "comment"}));
         big(app, ui, Icon::DeleteComment, "Delete", "comment.delete", json!({}));
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..5188f10c 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -187,7 +187,8 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
 sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
 matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
-show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
+show (8–12 h), compare presentations beyond slide-level accept (reject, per-object accept,
+markers on the slide: 3–5 h), password protection (4–6 h, ECMA-376 agile
 encryption), ink to shape/text (6–10 h), icons and 3-D models (8–14 h, needs an open icon set).
 
 ## UI/UX
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..f00fa766 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -9,7 +9,7 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 13 | 16 | 25 | 39% |
 
 | Area | Parity |
 |---|---|
@@ -30,7 +30,7 @@ The summary between `<!-- SUMMARY -->
 | Transitions | 92% |
 | Animations | 79% |
 | Slide show | 66% |
-| Review | 60% |
+| Review | 70% |
 | Draw | 33% |
 | Undo & clipboard | 88% |
 | Automation (✱) | 100% |
@@ -221,7 +221,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Slide show | Multi-monitor presenting | P1 | M |
 | Review | Comments (add, reply, resolve, delete) | P1 | D |
 | Review | Accessibility checker | P2 | D |
-| Review | Compare presentations | P2 | M |
+| Review | Compare presentations | P2 | P |
 | Review | Track changes / version history | P2 | M |
 | Draw | Ink pens, highlighter, eraser | P1 | P |
 | Draw | Ink to shape / text | P2 | M |

From 3489c3b22df500c55f5fc37069837e6bcf5a7a8b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 22:55:52 +0300
Subject: [PATCH 164/376] Format: report damaged embedded media and open such
 files as a repaired copy

load() ignored every failed media read, so a .deckcraft with a missing,
oversized or bad-CRC media member opened silently with empty pictures,
and the next Save overwrote the original with that loss.

load_checked() now lists each unreadable member (linked media saved
without bytes is not damage). file.open/openBytes return damagedMedia,
show a message, and open the deck as an untitled "(Repaired)" copy so
Save asks for a new name and the original file stays intact.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/file.rs | 44 ++++++++++++++++++++++----
 crates/engine/src/tests.rs    | 32 +++++++++++++++++++
 crates/format/src/lib.rs      | 58 ++++++++++++++++++++++++++++++++---
 3 files changed, 124 insertions(+), 10 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..4adc5182 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -65,9 +65,18 @@ fn new(s: &mut Session, p: &Value) -> Result<Value> {
 
 /// Recognise and read presentation bytes (native, PPTX).
 pub fn open_presentation(name: &str, bytes: &[u8]) -> Result<Presentation> {
+    open_checked(name, bytes).map(|(p, _)| p)
+}
+
+/// [`open_presentation`], plus the embedded media a `.deckcraft` file had lost or damaged.
+pub fn open_checked(name: &str, bytes: &[u8]) -> Result<(Presentation, Vec<String>)> {
     if deckcraft_format::sniff(bytes) {
-        return deckcraft_format::load(bytes).map_err(|e| EngineError::Other(e.to_string()));
+        return deckcraft_format::load_checked(bytes).map_err(|e| EngineError::Other(e.to_string()));
     }
+    open_other(name, bytes).map(|p| (p, vec![]))
+}
+
+fn open_other(name: &str, bytes: &[u8]) -> Result<Presentation> {
     if deckcraft_pptx::sniff(bytes) {
         let mut p = deckcraft_pptx::import(bytes).map_err(|e| EngineError::Other(e.to_string()))?;
         deckcraft_format::repair(&mut p);
@@ -98,11 +107,15 @@ pub fn add_opened(s: &mut Session, name: &str, path: Option<String>, p: Presenta
 fn open(s: &mut Session, p: &Value) -> Result<Value> {
     let path = str_param(p, "path").ok_or_else(|| bad("file.open", "missing `path`"))?;
     let bytes = std::fs::read(path).map_err(|e| EngineError::Other(format!("{path}: {e}")))?;
-    let doc = open_presentation(path, &bytes)?;
+    let (doc, damaged) = open_checked(path, &bytes)?;
     let native = deckcraft_format::sniff(&bytes) || deckcraft_pptx::sniff(&bytes);
-    let i = add_opened(s, path, native.then(|| path.to_string()), doc);
+    // A damaged file opens as an untitled repaired copy, so Save can't overwrite the original
+    // with the empty media.
+    let keep_path = native && damaged.is_empty();
+    let i = add_opened(s, path, keep_path.then(|| path.to_string()), doc);
+    report_damage(s, &damaged)?;
     let st = s.doc()?;
-    Ok(json!({"document": i, "slides": st.doc.slides.len(), "missingFonts": st.missing_fonts}))
+    Ok(json!({"document": i, "slides": st.doc.slides.len(), "missingFonts": st.missing_fonts, "damagedMedia": damaged}))
 }
 #[cfg(target_arch = "wasm32")]
 fn open(_s: &mut Session, _p: &Value) -> Result<Value> {
@@ -112,9 +125,28 @@ fn open(_s: &mut Session, _p: &Value) -> Result<Value> {
 fn open_bytes(s: &mut Session, p: &Value) -> Result<Value> {
     let name = str_param(p, "name").unwrap_or("Presentation");
     let data = str_param(p, "data").and_then(base64_decode).ok_or_else(|| bad("file.openBytes", "missing or invalid base64 `data`"))?;
-    let doc = open_presentation(name, &data)?;
+    let (doc, damaged) = open_checked(name, &data)?;
     let i = add_opened(s, name, None, doc);
-    Ok(json!({"document": i, "missingFonts": s.doc()?.missing_fonts}))
+    report_damage(s, &damaged)?;
+    Ok(json!({"document": i, "missingFonts": s.doc()?.missing_fonts, "damagedMedia": damaged}))
+}
+
+/// Tell the user which pictures and media a damaged file lost, and mark the copy repaired.
+fn report_damage(s: &mut Session, damaged: &[String]) -> Result<()> {
+    if damaged.is_empty() {
+        return Ok(());
+    }
+    let st = s.doc_mut()?;
+    st.title = format!("{} (Repaired)", st.title);
+    let n = damaged.len();
+    let text = format!(
+        "{n} picture{} or media file{} in this presentation couldn't be read and {} empty. It was opened as a repaired copy; save it under a new name to keep the original file.",
+        if n == 1 { "" } else { "s" },
+        if n == 1 { "" } else { "s" },
+        if n == 1 { "is" } else { "are" },
+    );
+    s.ui_requests.push(crate::UiRequest::Message { text });
+    Ok(())
 }
 
 /// Encode the presentation in `format` (`deckcraft`, `pptx`, `outline`).
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..d0b8655c 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,35 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// #392: a `.deckcraft` whose embedded picture is damaged opens as an untitled "(Repaired)"
+/// copy with a message, so Save can't overwrite the original with the empty media.
+#[test]
+fn damaged_native_file_opens_as_repaired_copy() {
+    let mut p = deckcraft_model::Presentation::default();
+    p.add_media("a.png", "image/png", b"PICTURE-BYTES-0123456789".to_vec());
+    let good = deckcraft_format::save(&p).unwrap();
+    // PNGs are stored as they are, so flipping a byte breaks the entry's CRC.
+    let mut bad = good.clone();
+    let at = bad.windows(13).position(|w| w == b"PICTURE-BYTES").unwrap();
+    bad[at] ^= 0xff;
+    let dir = std::env::temp_dir().join(format!("deckcraft-392-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    for (name, bytes, damaged) in [("good.deckcraft", &good, false), ("bad.deckcraft", &bad, true)] {
+        let path = dir.join(name);
+        std::fs::write(&path, bytes).unwrap();
+        let mut s = Session::new();
+        s.ui_requests.clear();
+        let r = s.execute("file.open", &json!({"path": path.to_string_lossy()})).unwrap();
+        let st = s.doc().unwrap();
+        assert_eq!(r["damagedMedia"].as_array().map(|a| a.len()), Some(usize::from(damaged)), "{r}");
+        assert_eq!(st.path.is_none(), damaged, "{name}");
+        assert_eq!(st.title.ends_with("(Repaired)"), damaged);
+        assert_eq!(s.ui_requests.iter().any(|u| matches!(u, crate::UiRequest::Message { .. })), damaged);
+        // Bytes route too.
+        let r = s.execute("file.openBytes", &json!({"name": name, "data": crate::cmd::base64_encode(bytes)})).unwrap();
+        assert_eq!(r["damagedMedia"].as_array().map(|a| a.len()), Some(usize::from(damaged)));
+    }
+    assert_eq!(std::fs::read(dir.join("bad.deckcraft")).unwrap(), bad, "original untouched");
+    let _ = std::fs::remove_dir_all(&dir);
+}
diff --git a/crates/format/src/lib.rs b/crates/format/src/lib.rs
index 1b37a232..52d75281 100644
--- a/crates/format/src/lib.rs
+++ b/crates/format/src/lib.rs
@@ -96,8 +96,15 @@ fn read_entry(z: &mut zip::ZipArchive<Cursor<&[u8]>>, name: &str) -> Result<Vec<
     Ok(out)
 }
 
-/// Read a presentation.
+/// Read a presentation. Embedded media that is missing or damaged is left empty; use
+/// [`load_checked`] to learn which.
 pub fn load(bytes: &[u8]) -> Result<Presentation> {
+    load_checked(bytes).map(|(p, _)| p)
+}
+
+/// Read a presentation and list the embedded media that couldn't be read (missing, too large
+/// or failing its CRC), one message each. Linked media saved without its bytes isn't damage.
+pub fn load_checked(bytes: &[u8]) -> Result<(Presentation, Vec<String>)> {
     let mut z = zip::ZipArchive::new(Cursor::new(bytes)).map_err(|e| FormatError::NotOurs(e.to_string()))?;
     let json = read_entry(&mut z, "presentation.json").map_err(|_| FormatError::NotOurs("no presentation.json".into()))?;
     let m: Manifest = serde_json::from_slice(&json).map_err(|e| FormatError::Damaged(e.to_string()))?;
@@ -105,13 +112,18 @@ pub fn load(bytes: &[u8]) -> Result<Presentation> {
         return Err(FormatError::NotOurs(m.format));
     }
     let mut p = m.presentation;
+    let mut damaged = vec![];
     for item in &mut p.media {
-        if let Ok(data) = read_entry(&mut z, &format!("media/{}", item.id.0)) {
-            item.data = Arc::new(data);
+        let name = format!("media/{}", item.id.0);
+        let linked_only = item.link.is_some() && z.index_for_name(&name).is_none();
+        match read_entry(&mut z, &name) {
+            Ok(data) => item.data = Arc::new(data),
+            Err(_) if linked_only => {}
+            Err(e) => damaged.push(e.to_string()),
         }
     }
     repair(&mut p);
-    Ok(p)
+    Ok((p, damaged))
 }
 
 /// Make a loaded presentation safe to edit: a master exists, every slide's layout exists,
@@ -218,6 +230,44 @@ pub fn slides_to_outline(p: &Presentation) -> String {
 mod tests {
     use super::*;
 
+    /// The same package without the entries `drop` names.
+    fn without(bytes: &[u8], drop: &str) -> Vec<u8> {
+        let mut z = zip::ZipArchive::new(Cursor::new(bytes)).unwrap();
+        let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+        for i in 0..z.len() {
+            let f = z.by_index(i).unwrap();
+            if f.name() != drop {
+                out.raw_copy_file(f).unwrap();
+            }
+        }
+        out.finish().unwrap().into_inner()
+    }
+
+    #[test]
+    fn missing_or_corrupt_media_is_reported() {
+        let mut p = Presentation::default();
+        let id = p.add_media("a.png", "image/png", b"PICTURE-BYTES-0123456789".to_vec());
+        let good = save(&p).unwrap();
+        assert!(load_checked(&good).unwrap().1.is_empty());
+        // Missing member.
+        let (q, damaged) = load_checked(&without(&good, &format!("media/{}", id.0))).unwrap();
+        assert_eq!(damaged.len(), 1, "{damaged:?}");
+        assert!(q.media(id).is_some_and(|m| m.data.is_empty()));
+        // Bad CRC: PNGs are stored, so their bytes sit in the file as they are.
+        let mut bad = good.clone();
+        let at = bad.windows(13).position(|w| w == b"PICTURE-BYTES").unwrap();
+        bad[at] ^= 0xff;
+        let (_, damaged) = load_checked(&bad).unwrap();
+        assert_eq!(damaged.len(), 1, "{damaged:?}");
+        // Linked media saved without its bytes isn't damage.
+        let mut l = Presentation::default();
+        let lid = l.add_media("v.mp4", "video/mp4", vec![]);
+        if let Some(m) = l.media.iter_mut().find(|m| m.id == lid) {
+            m.link = Some("file:///movies/v.mp4".into());
+        }
+        assert!(load_checked(&save(&l).unwrap()).unwrap().1.is_empty());
+    }
+
     #[test]
     fn roundtrip_with_media() {
         let mut p = Presentation::default();

From 24622bf94da8d074f7b76194c507b3b62e302f29 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:00:17 +0300
Subject: [PATCH 165/376] Format: bound total embedded media when opening a
 .deckcraft

Only each member was capped (2 GiB), so a compact archive with many
media items, or one large member listed under many items, could
inflate without limit and exhaust memory while opening.

Loading now caps all embedded media together (4 GiB) and the number
of media items (100,000), refuses a member before inflating it when it
declares more than is left, and keeps one item per media id, so a
repeated id inflates its member once and the deck can still be saved
(a zip can't hold two media/<id> entries).

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/format/src/lib.rs | 89 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 86 insertions(+), 3 deletions(-)

diff --git a/crates/format/src/lib.rs b/crates/format/src/lib.rs
index 1b37a232..d70303fb 100644
--- a/crates/format/src/lib.rs
+++ b/crates/format/src/lib.rs
@@ -18,6 +18,17 @@ pub const EXTENSION: &str = "deckcraft";
 pub const VERSION: u32 = 1;
 /// Largest entry we will inflate (guards against zip bombs).
 const MAX_ENTRY: u64 = 2 << 30;
+/// All embedded media together, inflated (#393).
+const MAX_TOTAL_MEDIA: u64 = 4 << 30;
+/// Media items one file may list.
+const MAX_MEDIA_ITEMS: usize = 100_000;
+
+/// What one load may inflate.
+#[derive(Clone, Copy)]
+struct Budget {
+    total: u64,
+    items: usize,
+}
 
 #[derive(Debug, thiserror::Error)]
 pub enum FormatError {
@@ -87,17 +98,31 @@ pub fn sniff(bytes: &[u8]) -> bool {
 }
 
 fn read_entry(z: &mut zip::ZipArchive<Cursor<&[u8]>>, name: &str) -> Result<Vec<u8>> {
+    read_entry_max(z, name, MAX_ENTRY)
+}
+
+/// Read one member, refusing it before inflating if it declares more than `max` bytes, and
+/// stopping at `max` if it inflates further than it declared.
+fn read_entry_max(z: &mut zip::ZipArchive<Cursor<&[u8]>>, name: &str, max: u64) -> Result<Vec<u8>> {
     let f = z.by_name(name).map_err(|e| FormatError::Damaged(format!("{name}: {e}")))?;
-    if f.size() > MAX_ENTRY {
+    if f.size() > max {
         return Err(FormatError::Damaged(format!("{name} is too large")));
     }
     let mut out = Vec::with_capacity(f.size().min(64 << 20) as usize);
-    f.take(MAX_ENTRY).read_to_end(&mut out).map_err(|e| FormatError::Damaged(format!("{name}: {e}")))?;
+    let mut f = f.take(max.saturating_add(1));
+    f.read_to_end(&mut out).map_err(|e| FormatError::Damaged(format!("{name}: {e}")))?;
+    if out.len() as u64 > max {
+        return Err(FormatError::Damaged(format!("{name} is too large")));
+    }
     Ok(out)
 }
 
 /// Read a presentation.
 pub fn load(bytes: &[u8]) -> Result<Presentation> {
+    load_within(bytes, Budget { total: MAX_TOTAL_MEDIA, items: MAX_MEDIA_ITEMS })
+}
+
+fn load_within(bytes: &[u8], budget: Budget) -> Result<Presentation> {
     let mut z = zip::ZipArchive::new(Cursor::new(bytes)).map_err(|e| FormatError::NotOurs(e.to_string()))?;
     let json = read_entry(&mut z, "presentation.json").map_err(|_| FormatError::NotOurs("no presentation.json".into()))?;
     let m: Manifest = serde_json::from_slice(&json).map_err(|e| FormatError::Damaged(e.to_string()))?;
@@ -105,8 +130,21 @@ pub fn load(bytes: &[u8]) -> Result<Presentation> {
         return Err(FormatError::NotOurs(m.format));
     }
     let mut p = m.presentation;
+    if p.media.len() > budget.items {
+        return Err(FormatError::Damaged(format!("{} media items (at most {})", p.media.len(), budget.items)));
+    }
+    // A repeated id names the same member: keep the first item, so the member is inflated once
+    // and the deck can be saved again (a zip can't hold two `media/<id>`).
+    let mut seen = std::collections::HashSet::new();
+    p.media.retain(|m| seen.insert(m.id));
+    let mut left = budget.total;
     for item in &mut p.media {
-        if let Ok(data) = read_entry(&mut z, &format!("media/{}", item.id.0)) {
+        let name = format!("media/{}", item.id.0);
+        if z.by_name(&name).is_ok_and(|f| f.size() > left) {
+            return Err(FormatError::Damaged("embedded media is larger than DeckCraft can open".into()));
+        }
+        if let Ok(data) = read_entry_max(&mut z, &name, left.min(MAX_ENTRY)) {
+            left -= data.len() as u64;
             item.data = Arc::new(data);
         }
     }
@@ -218,6 +256,51 @@ pub fn slides_to_outline(p: &Presentation) -> String {
 mod tests {
     use super::*;
 
+    #[test]
+    fn media_budget_is_cumulative() {
+        let mut p = Presentation::default();
+        p.add_media("a.bin", "application/octet-stream", vec![1; 600]);
+        p.add_media("b.bin", "application/octet-stream", vec![2; 600]);
+        let bytes = save(&p).unwrap();
+        // Exactly at the limit opens; one byte under is refused, though each item fits.
+        assert!(load_within(&bytes, Budget { total: 1200, items: 2 }).is_ok());
+        assert!(load_within(&bytes, Budget { total: 1199, items: 2 }).is_err());
+        assert!(load_within(&bytes, Budget { total: 1200, items: 1 }).is_err());
+    }
+
+    #[test]
+    fn repeated_media_ids_are_read_once() {
+        use std::io::Write;
+        let mut p = Presentation::default();
+        p.add_media("a.bin", "application/octet-stream", vec![7; 1000]);
+        let good = save(&p).unwrap();
+        // The same file with its media item listed 51 times.
+        let mut z = zip::ZipArchive::new(Cursor::new(good.as_slice())).unwrap();
+        let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+        for i in 0..z.len() {
+            let mut f = z.by_index(i).unwrap();
+            if f.name() == "presentation.json" {
+                let mut json = vec![];
+                f.read_to_end(&mut json).unwrap();
+                let mut v: serde_json::Value = serde_json::from_slice(&json).unwrap();
+                let media = &mut v["presentation"]["media"];
+                let one = media[0].clone();
+                *media = serde_json::Value::Array(vec![one; 51]);
+                out.start_file("presentation.json", zip::write::SimpleFileOptions::default()).unwrap();
+                out.write_all(&serde_json::to_vec(&v).unwrap()).unwrap();
+            } else {
+                out.raw_copy_file(f).unwrap();
+            }
+        }
+        let bytes = out.finish().unwrap().into_inner();
+        // 51 references to one 1000-byte member fit a 1000-byte budget: it's inflated once.
+        let q = load_within(&bytes, Budget { total: 1000, items: 51 }).unwrap();
+        assert_eq!(q.media.len(), 1);
+        assert_eq!(q.media[0].data.len(), 1000);
+        // And the deck saves again.
+        assert!(save(&q).is_ok());
+    }
+
     #[test]
     fn roundtrip_with_media() {
         let mut p = Presentation::default();

From 30c2fe4b6de23ef48764f08f357e39e6cd6b10b8 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:04:41 +0300
Subject: [PATCH 166/376] Design: Browse for Themes from a .thmx, .pptx or
 .potx file
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

deckcraft_pptx::import_theme reads the theme of a .thmx (its main document is
a theme part) or of a presentation's first master, with the media its format
scheme uses. design.browseTheme {path | name, data} applies it to the current
master as one undo step, giving the theme's pictures ids of this deck.

Design tab: Browse for Themes… next to the theme gallery and in the Slide
Master Themes menu; the desktop picker offers Office Theme (.thmx) and
presentations. Ribbon small buttons expose their label to accessibility (same
change as #512). Parity row Browse themes M → D.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 apps/deckcraft/src/main.rs              |  1 +
 crates/engine/src/cmd/design.rs         | 99 +++++++++++++++++++++++++
 crates/pptx/src/lib.rs                  | 59 +++++++++++++++
 crates/pptx/src/read/mod.rs             | 40 ++++++++++
 crates/ui-egui/src/browsetheme_tests.rs | 49 ++++++++++++
 crates/ui-egui/src/lib.rs               | 14 ++++
 crates/ui-egui/src/ribbon.rs            |  7 ++
 crates/ui-egui/src/widgets.rs           |  4 +
 docs/parity-checklist.md                |  8 +-
 9 files changed, 277 insertions(+), 4 deletions(-)
 create mode 100644 crates/ui-egui/src/browsetheme_tests.rs

diff --git a/apps/deckcraft/src/main.rs b/apps/deckcraft/src/main.rs
index 7b5e48bb..a71e6bf8 100644
--- a/apps/deckcraft/src/main.rs
+++ b/apps/deckcraft/src/main.rs
@@ -100,6 +100,7 @@ fn services() -> Services {
                     &["wav", "mp3", "m4a", "m4b", "aac", "flac", "ogg", "oga", "opus", "aif", "aiff", "aifc", "caf", "wma", "weba", "mka"],
                 ),
                 "video" => d.add_filter("Video", &["mp4", "m4v", "mov", "webm", "mkv", "wmv"]),
+                "theme" => d.add_filter("Themes and presentations", &["thmx", "pptx", "potx", "ppsx"]).add_filter("Office Theme", &["thmx"]),
                 _ => d
                     .add_filter("Presentations", &["deckcraft", "pptx", "potx", "ppsx"])
                     .add_filter("DeckCraft", &["deckcraft"])
diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..48bbc41c 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -15,6 +15,15 @@ use crate::{Result, Session, Target};
 pub fn specs() -> Vec<CommandSpec> {
     vec![
         cmd!("design.theme", "Themes", ["Design", "Themes"], None, "{name} (see design.themes)", has_doc, theme),
+        cmd!(
+            "design.browseTheme",
+            "Browse for Themes…",
+            ["Design", "Themes"],
+            None,
+            "{path} | {name, data: base64} — apply the theme of a .thmx, .pptx or .potx file",
+            has_doc,
+            browse_theme
+        ),
         cmd!(query "design.themes", "Theme Gallery", [], None, "{} → themes, colour schemes and font schemes", always, themes),
         cmd!("design.colors", "Colors", ["Design", "Variants"], None, "{name} | {colors: {accent1: #RRGGBB, …}}", has_doc, colors),
         cmd!("design.fonts", "Fonts", ["Design", "Variants"], None, "{name} | {major, minor}", has_doc, fonts),
@@ -79,6 +88,68 @@ fn theme(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"theme": name}))
 }
 
+fn browse_theme(s: &mut Session, p: &Value) -> Result<Value> {
+    let bytes = if let Some(data) = str_param(p, "data") {
+        super::base64_decode(data).ok_or_else(|| bad("design.browseTheme", "invalid base64 `data`"))?
+    } else {
+        #[cfg(not(target_arch = "wasm32"))]
+        {
+            let path = str_param(p, "path").ok_or_else(|| bad("design.browseTheme", "give `path` or `data`"))?;
+            std::fs::read(path).map_err(|e| crate::EngineError::Other(format!("{path}: {e}")))?
+        }
+        #[cfg(target_arch = "wasm32")]
+        return Err(bad("design.browseTheme", "give `data`"));
+    };
+    if !deckcraft_pptx::sniff(&bytes) {
+        return Err(bad("design.browseTheme", "not a theme or PowerPoint file"));
+    }
+    let (theme, media) = deckcraft_pptx::import_theme(&bytes).map_err(|e| bad("design.browseTheme", e.to_string()))?;
+    let name = theme.name.clone();
+    s.edit(|doc, sel| {
+        // The theme's pictures (format-scheme blip fills) get ids of this deck.
+        let mut map = std::collections::HashMap::new();
+        for m in &media {
+            let id = doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone());
+            map.insert(m.id.0, id.0);
+        }
+        let theme = if map.is_empty() { theme.clone() } else { remap_media_ids(&theme, &map)? };
+        let mi = master_index(doc, sel);
+        let m = Arc::make_mut(doc.masters.get_mut(mi).ok_or_else(|| bad("design.browseTheme", "no master"))?);
+        m.theme = theme;
+        m.color_map = vec![];
+        Ok(())
+    })?;
+    Ok(json!({"theme": name}))
+}
+
+/// `theme` with every `media` id field rewritten through `map` (format-scheme picture fills).
+fn remap_media_ids(theme: &deckcraft_model::theme::Theme, map: &std::collections::HashMap<u32, u32>) -> Result<deckcraft_model::theme::Theme> {
+    fn rec(v: &mut Value, map: &std::collections::HashMap<u32, u32>, depth: usize) {
+        if depth > 64 {
+            return;
+        }
+        match v {
+            Value::Object(o) => {
+                for (k, x) in o.iter_mut() {
+                    if k == "media"
+                        && let Some(n) = x.as_u64().and_then(|n| u32::try_from(n).ok())
+                        && let Some(new) = map.get(&n)
+                    {
+                        *x = json!(new);
+                    } else {
+                        rec(x, map, depth + 1);
+                    }
+                }
+            }
+            Value::Array(a) => a.iter_mut().for_each(|x| rec(x, map, depth + 1)),
+            _ => {}
+        }
+    }
+    let mut v = serde_json::to_value(theme).map_err(|e| bad("design.browseTheme", e.to_string()))?;
+    rec(&mut v, map, 0);
+    serde_json::from_value(v).map_err(|e| bad("design.browseTheme", e.to_string()))
+}
+
 fn master_index(doc: &Presentation, sel: &crate::Selection) -> usize {
     match sel.target {
         Target::Master { master } | Target::Layout { master, .. } => master,
@@ -564,3 +635,31 @@ mod tests {
         assert_eq!(super::civil(20_734), (2026, 10, 8));
     }
 }
+
+#[cfg(test)]
+mod browse_theme_tests {
+    use serde_json::json;
+
+    use crate::Session;
+
+    #[test]
+    fn applies_the_theme_of_another_deck_and_undoes() {
+        let mut other = Session::with_new();
+        other.execute("design.fonts", &json!({"major": "Lato", "minor": "Source Sans 3"})).unwrap();
+        other.execute("design.colors", &json!({"colors": {"accent1": "#123456"}})).unwrap();
+        let data = other.execute("file.saveBytes", &json!({"format": "pptx"})).unwrap()["data"].as_str().unwrap().to_string();
+        let mut s = Session::with_new();
+        s.execute("slide.new", &json!({"layout": "titleAndContent", "title": "T", "body": "B"})).unwrap();
+        let before = s.doc().unwrap().doc.masters[0].theme.clone();
+        s.execute("design.browseTheme", &json!({"name": "Brand.pptx", "data": data})).unwrap();
+        let t = &s.doc().unwrap().doc.masters[0].theme;
+        assert_eq!(t.fonts.major.latin, "Lato");
+        assert_eq!(t.fonts.minor.latin, "Source Sans 3");
+        assert_eq!(t.colors.get(deckcraft_color::SchemeSlot::Accent1).hex().to_lowercase(), "123456");
+        assert!(s.doc().unwrap().doc.validate().is_empty());
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(s.doc().unwrap().doc.masters[0].theme, before);
+        assert!(s.execute("design.browseTheme", &json!({"data": "AAAA"})).is_err());
+        assert!(s.execute("design.browseTheme", &json!({})).is_err());
+    }
+}
diff --git a/crates/pptx/src/lib.rs b/crates/pptx/src/lib.rs
index 92274b62..13daa3fb 100644
--- a/crates/pptx/src/lib.rs
+++ b/crates/pptx/src/lib.rs
@@ -49,6 +49,11 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
     read::import(bytes)
 }
 
+/// Read the theme of a `.thmx` file, or of a `.pptx` / `.potx`'s first master, with its media.
+pub fn import_theme(bytes: &[u8]) -> Result<(deckcraft_model::theme::Theme, Vec<deckcraft_model::MediaItem>), PptxError> {
+    read::import_theme(bytes)
+}
+
 /// Write a `.pptx` package.
 pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
     write::export(p)
@@ -83,3 +88,57 @@ pub(crate) fn mime_for(name: &str) -> &'static str {
         _ => "application/octet-stream",
     }
 }
+
+#[cfg(test)]
+mod import_theme_tests {
+    use std::io::{Read, Write};
+
+    use deckcraft_model::Presentation;
+
+    fn custom() -> Presentation {
+        let mut p = Presentation::default();
+        let m = std::sync::Arc::make_mut(&mut p.masters[0]);
+        m.theme.name = "Harbour".into();
+        m.theme.fonts.major.latin = "Lato".into();
+        m.theme.fonts.minor.latin = "Source Sans 3".into();
+        m.theme.colors.set(deckcraft_color::SchemeSlot::Accent1, deckcraft_color::Rgba::rgb(0x12, 0x34, 0x56));
+        p
+    }
+
+    /// A `.thmx`: the deck's theme part as the package's main document.
+    fn thmx(pptx: &[u8]) -> Vec<u8> {
+        let mut z = zip::ZipArchive::new(std::io::Cursor::new(pptx)).unwrap();
+        let mut theme = String::new();
+        z.by_name("ppt/theme/theme1.xml").unwrap().read_to_string(&mut theme).unwrap();
+        let mut out = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+        let o = zip::write::SimpleFileOptions::default();
+        out.start_file("[Content_Types].xml", o).unwrap();
+        out.write_all(br#"<?xml version="1.0" encoding="UTF-8"?><Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types"><Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/><Default Extension="xml" ContentType="application/xml"/><Override PartName="/theme/theme/theme1.xml" ContentType="application/vnd.openxmlformats-officedocument.theme+xml"/></Types>"#).unwrap();
+        out.start_file("_rels/.rels", o).unwrap();
+        out.write_all(br#"<?xml version="1.0" encoding="UTF-8"?><Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="theme/theme/theme1.xml"/></Relationships>"#).unwrap();
+        out.start_file("theme/theme/theme1.xml", o).unwrap();
+        out.write_all(theme.as_bytes()).unwrap();
+        out.finish().unwrap().into_inner()
+    }
+
+    #[test]
+    fn reads_the_theme_of_a_pptx_and_of_a_thmx() {
+        let pptx = crate::export(&custom()).unwrap();
+        for bytes in [pptx.clone(), thmx(&pptx)] {
+            let (t, _) = crate::import_theme(&bytes).unwrap();
+            assert_eq!(t.name, "Harbour");
+            assert_eq!(t.fonts.major.latin, "Lato");
+            assert_eq!(t.fonts.minor.latin, "Source Sans 3");
+            assert_eq!(t.colors.get(deckcraft_color::SchemeSlot::Accent1), deckcraft_color::Rgba::rgb(0x12, 0x34, 0x56));
+        }
+    }
+
+    #[test]
+    fn non_theme_packages_are_errors() {
+        assert!(crate::import_theme(b"not a zip").is_err());
+        let mut out = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+        out.start_file("[Content_Types].xml", zip::write::SimpleFileOptions::default()).unwrap();
+        out.write_all(b"<Types/>").unwrap();
+        assert!(crate::import_theme(&out.finish().unwrap().into_inner()).is_err());
+    }
+}
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..41186fb2 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -179,6 +179,46 @@ fn max_cnvpr(el: &El, m: &mut u32) {
     }
 }
 
+/// The theme of a `.thmx` theme file (its `officeDocument` is a theme part), or of the first
+/// master of a `.pptx` / `.potx`, with the media its format scheme uses (ids from 1).
+pub fn import_theme(bytes: &[u8]) -> Result<(deckcraft_model::theme::Theme, Vec<MediaItem>), PptxError> {
+    let pkg = Package::open(bytes)?;
+    let target = pkg.rels("").first_of("officeDocument").map(|r| r.target.clone());
+    let theme_path = match &target {
+        Some(t) if pkg.xml(t).is_some_and(|d| d.root.is("theme")) => t.clone(),
+        _ => {
+            // A presentation: its first master's theme.
+            let pres = target.unwrap_or_else(|| "ppt/presentation.xml".into());
+            let pres_doc = load(&pkg, &pres).ok_or_else(|| PptxError::NotPptx("neither a theme nor a presentation".into()))?;
+            let pres_part = Part::new(&pkg, &pres, &pres_doc);
+            let master = pres_doc
+                .root
+                .child("sldMasterIdLst")
+                .and_then(|l| l.children_named("sldMasterId").next())
+                .and_then(|m| pres_part.rels.target(m.attr("r:id").unwrap_or("")).map(String::from))
+                .or_else(|| pres_part.rels.all_of("slideMaster").next().map(|r| r.target.clone()))
+                .ok_or_else(|| PptxError::NotPptx("the presentation has no slide master".into()))?;
+            pkg.rels(&master).first_of("theme").map(|r| r.target.clone()).ok_or_else(|| PptxError::NotPptx("the slide master has no theme".into()))?
+        }
+    };
+    let doc = load(&pkg, &theme_path).ok_or_else(|| PptxError::NotPptx(format!("missing or unreadable {theme_path}")))?;
+    if !doc.root.is("theme") {
+        return Err(PptxError::NotPptx(format!("{theme_path} is not a theme part")));
+    }
+    let mut imp = Imp {
+        pkg: &pkg,
+        media: vec![],
+        media_by_part: HashMap::new(),
+        next: 0,
+        slide_by_part: HashMap::new(),
+        custom_show_names: HashMap::new(),
+        table_style_ids: Vec::new(),
+    };
+    let part = Part::new(&pkg, &theme_path, &doc);
+    let theme = theme::read_theme(&mut imp, &part, &doc.root);
+    Ok((theme, imp.media))
+}
+
 pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
     let pkg = Package::open(bytes)?;
     let root_rels = pkg.rels("");
diff --git a/crates/ui-egui/src/browsetheme_tests.rs b/crates/ui-egui/src/browsetheme_tests.rs
new file mode 100644
index 00000000..cb65ec59
--- /dev/null
+++ b/crates/ui-egui/src/browsetheme_tests.rs
@@ -0,0 +1,49 @@
+//! Design › Browse for Themes…: picking a .pptx applies its theme.
+
+use std::cell::RefCell;
+use std::rc::Rc;
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+#[test]
+fn browse_button_applies_the_picked_files_theme() {
+    let dir = std::env::temp_dir().join(format!("deckcraft-thmx-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let mut brand = Session::with_new();
+    brand.execute("design.fonts", &json!({"major": "Lato", "minor": "Lato"})).unwrap();
+    let path = dir.join("Brand.pptx");
+    brand.execute("file.saveAs", &json!({"path": path.to_string_lossy()})).unwrap();
+    let asked: Rc<RefCell<Vec<String>>> = Rc::default();
+    let log = asked.clone();
+    let p2 = path.to_string_lossy().to_string();
+    let services = Services {
+        pick_open: Some(Box::new(move |purpose: &str| {
+            log.borrow_mut().push(purpose.to_string());
+            Some(p2.clone())
+        })),
+        read: Some(Box::new(|p: &str| std::fs::read(p).map_err(|e| e.to_string()))),
+        ..Default::default()
+    };
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "title", "title": "Hello"})).unwrap();
+    let mut app = SlideApp::new(s, services);
+    app.ui.tab = "Design".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.get_by_label("Browse for Themes…").click();
+    h.run_steps(3);
+    assert_eq!(asked.borrow().as_slice(), ["theme"]);
+    assert_eq!(h.state().session.active().unwrap().doc.masters[0].theme.fonts.major.latin, "Lato");
+    let _ = std::fs::remove_dir_all(&dir);
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..1aba5ac1 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -167,6 +167,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.insertVideoDialog", "Video from File…", None, "{}"),
     ("app.saveAsDialog", "Save As…", None, "{}"),
     ("app.exportDialog", "Export…", None, "{}"),
+    ("app.browseThemeDialog", "Browse for Themes…", None, "{}"),
     ("app.dialog", "Open Dialog", None, "{id}"),
     ("app.links", "Community Links", None, "{}"),
 ];
@@ -541,6 +542,17 @@ impl SlideApp {
             "app.insertVideoDialog" => self.pick_and_insert("video", "insert.video"),
             "app.saveAsDialog" => self.save_as_dialog("deckcraft"),
             "app.exportDialog" => self.dialog = Some(dialogs::Dialog::new("export")),
+            "app.browseThemeDialog" => {
+                if self.session.active().is_none() {
+                    return Err("open a presentation first".into());
+                }
+                if self.services.pick_open.is_some() {
+                    self.pick_and_insert("theme", "design.browseTheme");
+                } else {
+                    // The browser's asynchronous picker would open the file as a new document.
+                    self.set_status("Browse for Themes needs the desktop app for now".to_string());
+                }
+            }
             "app.dialog" => {
                 let d = p.get("id").and_then(Value::as_str).ok_or("missing `id`")?;
                 self.dialog = Some(dialogs::Dialog::new(d));
@@ -1127,6 +1139,8 @@ fn js_now() -> f64 {
     js_sys::Date::now()
 }
 
+#[cfg(test)]
+mod browsetheme_tests;
 #[cfg(test)]
 mod ime_tests;
 
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..81322839 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1232,6 +1232,9 @@ fn design(app: &mut SlideApp, ui: &mut Ui) {
         {
             run(app, "design.theme", json!({"name": n}));
         }
+        if small_button(ui, Icon::Themes, "Browse for Themes…", enabled(app, "design.browseTheme"), false).clicked() {
+            run(app, "app.browseThemeDialog", json!({}));
+        }
     });
     group(ui, |ui| {
         let r = big_button(ui, Icon::Colors, "Colors", true);
@@ -2398,6 +2401,10 @@ fn slide_master(app: &mut SlideApp, ui: &mut Ui) {
                     run(app, "design.theme", json!({"name": th.name}));
                 }
             }
+            ui.separator();
+            if ui.button("Browse for Themes…").clicked() {
+                run(app, "app.browseThemeDialog", json!({}));
+            }
         });
         big(app, ui, Icon::FormatBackground, "Background\nStyles", "view.pane", json!({"pane": "background"}));
     });
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 5827b396..972630ac 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -121,6 +121,10 @@ pub fn small_button_ex(ui: &mut Ui, icon: Icon, label: &str, enabled: bool, sele
     let main_rect = Rect::from_min_max(rect.min, pos2(rect.max.x - arrow_w, rect.max.y));
     let main_resp =
         if split { ui.interact(main_rect, resp.id.with("m"), if enabled { Sense::click() } else { Sense::hover() }) } else { resp.clone() };
+    // Screen readers (and UI tests) find the button by its text.
+    if !label.is_empty() {
+        main_resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, label));
+    }
     let arrow_resp = split.then(|| {
         ui.interact(
             Rect::from_min_max(pos2(rect.max.x - arrow_w, rect.min.y), rect.max),
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..1227f986 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -3,13 +3,13 @@
 > **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 79%** over 191 features.
+**Weighted breadth parity: 80%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 14 | 15 | 25 | 40% |
 
 | Area | Parity |
 |---|---|
@@ -17,7 +17,7 @@ The summary between `<!-- SUMMARY -->
 | Files | 71% |
 | Slides | 90% |
 | Views | 90% |
-| Masters & themes | 85% |
+| Masters & themes | 88% |
 | Shapes | 88% |
 | Format | 83% |
 | Arrange | 100% |
@@ -102,7 +102,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Masters & themes | Hide background graphics | P1 | D |
 | Masters & themes | Slide size (16:9, 4:3, presets, custom) | P0 | D |
 | Masters & themes | Header & footer (date, slide number, footer) | P1 | D |
-| Masters & themes | Browse themes from .pptx/.thmx | P2 | M |
+| Masters & themes | Browse themes from .pptx/.thmx | P2 | D |
 | Masters & themes | Designer layout suggestions (offline) | P2 | M |
 | Shapes | Preset shapes (lines, rectangles, basic, arrows, equation, flowchart, stars, callouts) | P0 | D |
 | Shapes | Action buttons | P2 | D |

From e8a383effa8934bdca73b2767b90ed4580616786 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:07:50 +0300
Subject: [PATCH 167/376] PPTX: keep add-in tags on the presentation, slides
 and shapes

p:custDataLst points at ppt/tags/tagN.xml parts that add-ins such as
think-cell, Mekko Graphics and Office Timeline use to recognise their
decks, slides and shapes. They were dropped on open, so a saved deck lost
its add-in identity. The model now carries name/value tags on the
presentation, slides and shapes; the reader resolves every tags part and
the writer emits one tags part per holder, in the schema's element order.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/model/src/defaults.rs    |  1 +
 crates/model/src/lib.rs         | 13 +++++++-
 crates/pptx/src/read/mod.rs     | 17 +++++++++++
 crates/pptx/src/read/shapes.rs  |  1 +
 crates/pptx/src/write/mod.rs    | 43 ++++++++++++++++++++++----
 crates/pptx/src/write/shapes.rs | 54 +++++++++++++++++----------------
 crates/pptx/tests/tags.rs       | 38 +++++++++++++++++++++++
 docs/file-format-parity.md      |  4 ++-
 8 files changed, 137 insertions(+), 34 deletions(-)
 create mode 100644 crates/pptx/tests/tags.rs

diff --git a/crates/model/src/defaults.rs b/crates/model/src/defaults.rs
index 8432ce4a..2031e6bd 100644
--- a/crates/model/src/defaults.rs
+++ b/crates/model/src/defaults.rs
@@ -513,6 +513,7 @@ pub fn blank_presentation(size: Size, theme: Theme, title_slide: bool) -> Presen
         next_id: next.max(256),
         embedded_fonts: vec![],
         table_styles: vec![],
+        tags: vec![],
         raw_ext: None,
     };
     if title_slide {
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..7d05d804 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -317,6 +317,9 @@ pub struct Shape {
     pub decorative: bool,
     pub click: Option<text::Hyperlink>,
     pub hover: Option<text::Hyperlink>,
+    /// Add-in tags (`p:custDataLst` → `ppt/tags/tagN.xml`): name/value pairs kept for round trip.
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub tags: Vec<(String, String)>,
     /// Unmodelled XML kept for round-trip (extension lists etc.).
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw_ext: Option<String>,
@@ -344,6 +347,7 @@ impl Default for Shape {
             decorative: false,
             click: None,
             hover: None,
+            tags: vec![],
             raw_ext: None,
         }
     }
@@ -534,7 +538,10 @@ pub struct Slide {
     /// the layout.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub color_map: Option<Vec<(String, String)>>,
-    /// Unmodelled XML kept for round-trip (custom data, tags).
+    /// Add-in tags (`p:custDataLst` → `ppt/tags/tagN.xml`): name/value pairs kept for round trip.
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub tags: Vec<(String, String)>,
+    /// Unmodelled XML kept for round-trip (custom data).
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw_ext: Option<String>,
 }
@@ -554,6 +561,7 @@ impl Default for Slide {
             notes: TextBody::default(),
             comments: vec![],
             color_map: None,
+            tags: vec![],
             raw_ext: None,
         }
     }
@@ -843,6 +851,9 @@ pub struct Presentation {
     /// Table styles defined in the file (`ppt/tableStyles.xml`).
     #[serde(skip_serializing_if = "Vec::is_empty")]
     pub table_styles: Vec<table::TableStyleDef>,
+    /// Add-in tags (`p:custDataLst` → `ppt/tags/tagN.xml`): name/value pairs kept for round trip.
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub tags: Vec<(String, String)>,
     /// Unmodelled presentation-level XML kept for round-trip.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw_ext: Option<String>,
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..3d8a6bb5 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -119,6 +119,21 @@ pub fn keep_xml(el: &El, ns: &[(String, String)]) -> String {
 /// Namespace prefixes whose `mc:Choice` content we understand.
 const SUPPORTED_MC: [&str; 9] = ["p14", "p15", "p159", "a14", "a16", "p1510", "a15", "c14", "p188"];
 
+/// Add-in tags named by `holder`'s `p:custDataLst`: the name/value pairs of each tags part.
+pub fn tags(imp: &Imp, part: &Part, holder: &El) -> Vec<(String, String)> {
+    let Some(list) = holder.child("custDataLst") else { return vec![] };
+    let mut out = Vec::new();
+    for t in list.children_named("tags").take(100) {
+        let Some(doc) = t.attr("r:id").and_then(|id| part.rels.get(id)).and_then(|r| imp.pkg.xml(&r.target)) else { continue };
+        for tag in doc.root.children_named("tag").take(10_000) {
+            if let Some(name) = tag.attr("name") {
+                out.push((name.to_string(), tag.attr("val").unwrap_or("").to_string()));
+            }
+        }
+    }
+    out
+}
+
 /// Replace every `mc:AlternateContent` by the children of the branch we can read best.
 pub fn resolve_mc(el: &mut El, depth: usize) {
     if depth > crate::xml::MAX_DEPTH {
@@ -342,6 +357,7 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
             p.raw_ext = Some(kept);
         }
     }
+    p.tags = tags(&imp, &pres_part, pres_el);
     // Custom shows.
     if let Some(l) = pres_el.child("custShowLst") {
         for cs in l.children_named("custShow") {
@@ -707,6 +723,7 @@ fn read_slide(imp: &mut Imp, part: &Part, doc: &Doc, id: SlideId, layout: Layout
     let mut ctx = shapes::IdCtx::default();
     if let Some(csld) = root.child("cSld") {
         s.name = csld.attr("name").unwrap_or("").to_string();
+        s.tags = tags(imp, part, csld);
         s.background = background(imp, part, csld);
         if let Some(tree) = csld.child("spTree") {
             s.shapes = shapes::sp_tree(imp, part, &mut ctx, tree, 0);
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index c4b3f77f..9d59d0cd 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -165,6 +165,7 @@ fn base(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, nv: Option<&El>) -> Shape {
                             has_custom_prompt: ph.bool("hasCustomPrompt").unwrap_or(false),
                         });
                     }
+                    s.tags = super::tags(imp, part, e);
                 }
                 _ => {}
             }
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..3567d542 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -29,6 +29,7 @@ const CT_THEME: &str = "application/vnd.openxmlformats-officedocument.theme+xml"
 const CT_PRES_PROPS: &str = "application/vnd.openxmlformats-officedocument.presentationml.presProps+xml";
 const CT_VIEW_PROPS: &str = "application/vnd.openxmlformats-officedocument.presentationml.viewProps+xml";
 const CT_TABLE_STYLES: &str = "application/vnd.openxmlformats-officedocument.presentationml.tableStyles+xml";
+const CT_TAGS: &str = "application/vnd.openxmlformats-officedocument.presentationml.tags+xml";
 const CT_CHART: &str = "application/vnd.openxmlformats-officedocument.drawingml.chart+xml";
 const CT_COMMENTS: &str = "application/vnd.openxmlformats-officedocument.presentationml.comments+xml";
 const CT_AUTHORS: &str = "application/vnd.openxmlformats-officedocument.presentationml.commentAuthors+xml";
@@ -43,6 +44,7 @@ pub struct Exp<'a> {
     n_image: u32,
     n_media: u32,
     n_chart: u32,
+    n_tags: u32,
     pub slide_parts: HashMap<SlideId, String>,
     pub table_styles: Vec<String>,
     placeholder: Option<String>,
@@ -158,6 +160,19 @@ impl Exp<'_> {
         };
         o.rels.add("image", &opc::relative(&o.name, &part), false)
     }
+    /// A new `ppt/tags/tagN.xml` part holding `tags`, related from `o`.
+    pub fn tags_rel(&mut self, o: &mut Out, tags: &Tags) -> String {
+        self.n_tags += 1;
+        let name = format!("ppt/tags/tag{}.xml", self.n_tags);
+        let mut w = W::new();
+        root_open(&mut w, "p:tagLst", A::new());
+        for (n, v) in tags.iter().take(10_000) {
+            w.empty("p:tag", A::new().a("name", n).a("val", v));
+        }
+        w.close("p:tagLst");
+        self.pkg.xml_part(&name, CT_TAGS, w.finish());
+        o.rels.add_new("tags", &opc::relative(&o.name, &name), false)
+    }
     pub fn chart_rel(&mut self, o: &mut Out, c: &deckcraft_model::Chart) -> String {
         self.n_chart += 1;
         let name = format!("ppt/charts/chart{}.xml", self.n_chart);
@@ -166,6 +181,17 @@ impl Exp<'_> {
     }
 }
 
+/// `p:custDataLst` pointing at a tags part, when there are tags.
+pub fn cust_data(w: &mut W, x: &mut Exp, o: &mut Out, tags: &Tags) {
+    if tags.is_empty() {
+        return;
+    }
+    let id = x.tags_rel(o, tags);
+    w.open0("p:custDataLst");
+    w.empty("p:tags", A::new().a("r:id", id));
+    w.close("p:custDataLst");
+}
+
 fn root_open(w: &mut W, tag: &str, extra: A) {
     let mut a = A::new().a("xmlns:a", NS_A).a("xmlns:r", NS_R).a("xmlns:p", NS_P);
     a.v.extend(extra.v);
@@ -194,7 +220,9 @@ fn background(w: &mut W, x: &mut Exp, o: &mut Out, bg: &Background) {
     w.close("p:bg");
 }
 
-fn csld(w: &mut W, x: &mut Exp, o: &mut Out, name: &str, bg: Option<&Background>, list: &[Shape]) -> shapes::IdMap {
+type Tags = [(String, String)];
+
+fn csld(w: &mut W, x: &mut Exp, o: &mut Out, name: &str, bg: Option<&Background>, list: &[Shape], tags: &Tags) -> shapes::IdMap {
     w.open("p:cSld", A::new().o("name", (!name.is_empty()).then_some(name)));
     if let Some(bg) = bg {
         background(w, x, o, bg);
@@ -207,6 +235,7 @@ fn csld(w: &mut W, x: &mut Exp, o: &mut Out, name: &str, bg: Option<&Background>
         shapes::shapes(w, x, o, &mut cx, list, 0);
     }
     w.close("p:spTree");
+    cust_data(w, x, o, tags);
     w.close("p:cSld");
     ids
 }
@@ -385,6 +414,7 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         n_image: 0,
         n_media: 0,
         n_chart: 0,
+        n_tags: 0,
         slide_parts: HashMap::new(),
         table_styles: vec![],
         placeholder: None,
@@ -450,7 +480,7 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         let mut w = W::new();
         root_open(&mut w, "p:notesMaster", A::new());
         let bg = Background::Ref { idx: 1001, color: deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Bg1) };
-        csld(&mut w, &mut x, &mut no, "", Some(&bg), &notes_master_shapes(p.notes_size));
+        csld(&mut w, &mut x, &mut no, "", Some(&bg), &notes_master_shapes(p.notes_size), &[]);
         clr_map(&mut w, &[]);
         dml::list_style(&mut w, &mut x, &mut no, "p:notesStyle", &notes_style());
         w.close("p:notesMaster");
@@ -536,7 +566,7 @@ fn layout_xml(x: &mut Exp, o: &mut Out, l: &Layout) -> Vec<u8> {
         "p:sldLayout",
         A::new().o("showMasterSp", (!l.show_master_shapes).then_some("0")).a("type", l.kind.xml()).t("preserve", l.preserve),
     );
-    csld(&mut w, x, o, &l.name, l.background.as_ref(), &l.shapes);
+    csld(&mut w, x, o, &l.name, l.background.as_ref(), &l.shapes, &[]);
     clr_map_ovr(&mut w, l.color_map.as_deref());
     ext_list(&mut w, ext_children(l.raw_ext.as_deref()).as_deref());
     w.close("p:sldLayout");
@@ -546,7 +576,7 @@ fn layout_xml(x: &mut Exp, o: &mut Out, l: &Layout) -> Vec<u8> {
 fn master_xml(x: &mut Exp, o: &mut Out, m: &Master, layouts: &[(u64, String)]) -> Vec<u8> {
     let mut w = W::new();
     root_open(&mut w, "p:sldMaster", A::new().t("preserve", m.preserve));
-    csld(&mut w, x, o, &m.name, m.background.as_ref(), &m.shapes);
+    csld(&mut w, x, o, &m.name, m.background.as_ref(), &m.shapes, &[]);
     clr_map(&mut w, &m.color_map);
     w.open0("p:sldLayoutIdLst");
     for (id, rid) in layouts {
@@ -568,7 +598,7 @@ fn master_xml(x: &mut Exp, o: &mut Out, m: &Master, layouts: &[(u64, String)]) -
 fn slide_xml(x: &mut Exp, o: &mut Out, s: &Slide) -> Vec<u8> {
     let mut w = W::new();
     root_open(&mut w, "p:sld", A::new().o("showMasterSp", (!s.show_master_shapes).then_some("0")).o("show", s.hidden.then_some("0")));
-    let ids = csld(&mut w, x, o, &s.name, s.background.as_ref(), &s.shapes);
+    let ids = csld(&mut w, x, o, &s.name, s.background.as_ref(), &s.shapes, &s.tags);
     clr_map_ovr(&mut w, s.color_map.as_deref());
     if let Some(t) = &s.transition {
         timing::transition(&mut w, x, o, t);
@@ -599,7 +629,7 @@ fn notes_xml(x: &mut Exp, o: &mut Out, notes: &TextBody) -> Vec<u8> {
         text: Some(tb),
         ..Default::default()
     };
-    csld(&mut w, x, o, "", None, &[img, body]);
+    csld(&mut w, x, o, "", None, &[img, body], &[]);
     w.open0("p:clrMapOvr");
     w.empty0("a:masterClrMapping");
     w.close("p:clrMapOvr");
@@ -706,6 +736,7 @@ fn presentation_xml(x: &mut Exp, o: &mut Out, masters: &[(u64, String)], notes:
         }
         w.close("p:custShowLst");
     }
+    cust_data(&mut w, x, o, &p.tags);
     let dts = if p.default_text_style.is_empty() { defaults::default_text_style() } else { p.default_text_style.clone() };
     dml::list_style(&mut w, x, o, "p:defaultTextStyle", &dts);
     let sections = section_slides(p);
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..b1ad5cac 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -153,28 +153,30 @@ fn cnvpr(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape) {
     w.close("p:cNvPr");
 }
 
-fn nv_pr(w: &mut W, s: &Shape) {
-    match &s.ph {
-        Some(ph) => {
-            w.open0("p:nvPr");
-            let ty = match ph.kind {
-                PhType::Obj => None,
-                k => Some(k.xml()),
-            };
-            let sz = ph.size.as_deref().filter(|z| matches!(*z, "full" | "half" | "quarter"));
-            w.empty(
-                "p:ph",
-                A::new()
-                    .o("type", ty)
-                    .o("orient", ph.vertical.then_some("vert"))
-                    .o("sz", sz)
-                    .o("idx", (ph.idx != 0).then_some(ph.idx))
-                    .t("hasCustomPrompt", ph.has_custom_prompt),
-            );
-            w.close("p:nvPr");
-        }
-        None => w.empty0("p:nvPr"),
+fn nv_pr(w: &mut W, x: &mut Exp, o: &mut Out, s: &Shape) {
+    if s.ph.is_none() && s.tags.is_empty() {
+        w.empty0("p:nvPr");
+        return;
     }
+    w.open0("p:nvPr");
+    if let Some(ph) = &s.ph {
+        let ty = match ph.kind {
+            PhType::Obj => None,
+            k => Some(k.xml()),
+        };
+        let sz = ph.size.as_deref().filter(|z| matches!(*z, "full" | "half" | "quarter"));
+        w.empty(
+            "p:ph",
+            A::new()
+                .o("type", ty)
+                .o("orient", ph.vertical.then_some("vert"))
+                .o("sz", sz)
+                .o("idx", (ph.idx != 0).then_some(ph.idx))
+                .t("hasCustomPrompt", ph.has_custom_prompt),
+        );
+    }
+    super::cust_data(w, x, o, &s.tags);
+    w.close("p:nvPr");
 }
 
 /// Locking attributes. Lock writes the full set PowerPoint writes for the element's kind (and
@@ -284,7 +286,7 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
             w.open0("p:cNvPicPr");
             locks(w, "a:picLocks", s, A::new().a("noChangeAspect", "1"));
             w.close("p:cNvPicPr");
-            nv_pr(w, s);
+            nv_pr(w, x, o, s);
             w.close("p:nvPicPr");
             dml::blip_fill(w, x, o, "p:blipFill", fill);
             let mut s2 = s.clone();
@@ -305,7 +307,7 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
             w.open0("p:cNvGrpSpPr");
             locks(w, "a:grpSpLocks", s, A::new());
             w.close("p:cNvGrpSpPr");
-            nv_pr(w, s);
+            nv_pr(w, x, o, s);
             w.close("p:nvGrpSpPr");
             w.open0("p:grpSpPr");
             let xf = s.xfrm.unwrap_or(*child);
@@ -340,7 +342,7 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
                 }
                 w.close("p:cNvCxnSpPr");
             }
-            nv_pr(w, s);
+            nv_pr(w, x, o, s);
             w.close("p:nvCxnSpPr");
             let mut s2 = s.clone();
             if matches!(s2.fill, Some(Fill::Background)) {
@@ -448,7 +450,7 @@ fn sp(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape, math: bool) {
     } else {
         w.empty("p:cNvSpPr", cnv);
     }
-    nv_pr(w, s);
+    nv_pr(w, x, o, s);
     w.close("p:nvSpPr");
     let tmp;
     let sref = if matches!(s.fill, Some(Fill::Background)) {
@@ -476,7 +478,7 @@ fn frame_open(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape) {
     w.open0("p:cNvGraphicFramePr");
     w.empty("a:graphicFrameLocks", A::new().a("noGrp", "1").t("noDrilldown", s.locked).t("noMove", s.locked).t("noResize", s.locked));
     w.close("p:cNvGraphicFramePr");
-    nv_pr(w, s);
+    nv_pr(w, x, o, s);
     w.close("p:nvGraphicFramePr");
     let xf = s.xfrm.unwrap_or_default();
     let mut xf0 = xf;
diff --git a/crates/pptx/tests/tags.rs b/crates/pptx/tests/tags.rs
new file mode 100644
index 00000000..e8903b44
--- /dev/null
+++ b/crates/pptx/tests/tags.rs
@@ -0,0 +1,38 @@
+//! Add-in tags (`p:custDataLst` → `ppt/tags/tagN.xml`) on the presentation, slides and shapes
+//! survive a save and reopen.
+
+use std::io::{Cursor, Read};
+use std::sync::Arc;
+
+use deckcraft_engine::Session;
+
+fn t(n: &str, v: &str) -> (String, String) {
+    (n.to_string(), v.to_string())
+}
+
+#[test]
+fn tags_survive_round_trip() {
+    let mut s = Session::new();
+    deckcraft_engine::sample::open_sample(&mut s).expect("sample");
+    let mut p = s.doc().expect("doc").doc.as_ref().clone();
+    p.tags = vec![t("THINKCELLPRESENTATIONDONOTDELETE", "<xml & stuff>")];
+    let slide = Arc::make_mut(&mut p.slides[0]);
+    slide.tags = vec![t("TIMING", "5"), t("SECTION", "Intro")];
+    let shape_id = slide.shapes[0].id;
+    slide.shapes[0].tags = vec![t("THINKCELLSHAPEDONOTDELETE", "t!abc")];
+
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut zip = zip::ZipArchive::new(Cursor::new(bytes.clone())).expect("zip");
+    let mut ct = String::new();
+    zip.by_name("[Content_Types].xml").expect("ct").read_to_string(&mut ct).expect("read");
+    assert!(ct.contains("presentationml.tags+xml"));
+    assert_eq!((0..zip.len()).filter(|i| zip.by_index(*i).is_ok_and(|f| f.name().starts_with("ppt/tags/"))).count(), 3);
+
+    let back = deckcraft_pptx::import(&bytes).expect("import");
+    assert_eq!(back.tags, p.tags);
+    assert_eq!(back.slides[0].tags, p.slides[0].tags);
+    let first = &back.slides[0].shapes[0];
+    assert_eq!(first.name, p.slides[0].shapes.iter().find(|s| s.id == shape_id).map(|s| s.name.clone()).unwrap_or_default());
+    assert_eq!(first.tags, vec![t("THINKCELLSHAPEDONOTDELETE", "t!abc")]);
+    assert!(back.slides.iter().skip(1).all(|s| s.tags.is_empty()));
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..48cab8d9 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -83,7 +83,8 @@ the round trip even though DeckCraft doesn't model it.
 | Comments: legacy | yes | yes | |
 | Comments: modern threaded (`p188`) | yes | no (written as legacy) | Replies and resolved state lost (#70) |
 | Unknown slide-level elements (`graphicFrame` OLE, extensions, `mc:AlternateContent`) | kept | kept | Rendered as a labelled placeholder with the preview picture when present |
-| Tags, custom XML, VBA | no / no / no | | |
+| Tags (`p:custDataLst`) on the presentation, slides and shapes | yes | yes | Add-ins such as think-cell keep their identity; `tags_survive_round_trip` |
+| Custom XML, VBA | no / no | no / no | |
 | Embedded fonts | no | no | |
 | Encryption (password to open) | no | no | |
 
@@ -99,6 +100,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Add-in tags on the presentation, slides and shapes read and written |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |

From 034b312a644ffb2639bc11efe8439bbcfb081aa2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:08:31 +0300
Subject: [PATCH 168/376] Round-trip tables, charts, animation, media, sections
 and masters
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

An owned corpus of those deck kinds survives open, save and reopen. The
check found the handout master — printed header, footer, date and slide
number — was dropped on save, so import and export now keep that part.
---
 ROADMAP.md                        |   8 +-
 crates/model/src/lib.rs           |   4 +
 crates/pptx/src/read/mod.rs       |  29 ++
 crates/pptx/src/write/mod.rs      |  33 +-
 crates/pptx/tests/corpus_kinds.rs | 605 ++++++++++++++++++++++++++++++
 docs/file-format-parity.md        |  14 +-
 docs/gaps.md                      |  20 +-
 docs/roadmap.md                   |  10 +-
 8 files changed, 699 insertions(+), 24 deletions(-)
 create mode 100644 crates/pptx/tests/corpus_kinds.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..9edc372d 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (progress log: owned PPTX corpus for more deck kinds, handout-master text; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -111,8 +111,8 @@ Ranked; detail and the full beta plan in [docs/roadmap.md](docs/roadmap.md).
 
 1. **No data loss, no startup crashes:** Close's save prompt (#60), Windows GPU crashes (#40, #59),
    image paste (#53), editor soak tests. 10–20 h.
-2. **PPTX on real decks:** owned corpus, round-trip checks, fixes; #70, #74, #77; EMF/WMF and SVG.
-   36–64 h.
+2. **PPTX on real decks:** a larger owned corpus and the remaining round-trip losses; #70, #74, #77;
+   EMF/WMF and SVG. 36–64 h.
 3. **Localization:** catalog, system language (#15), zh-Hans, es, fr, de, ja with IME. 27–46 h.
 4. **Output:** vector PDF, printing. 10–16 h.
 5. **Depth that users hit:** font weights (#69), chart data and elements, Animation Pane timeline,
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | PPTX corpus round-trip for tables, charts, animations, media, sections and masters/layouts (open → save → reopen, package parts and text). A handout master's header, footer, date and slide number are kept |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: owned PPTX corpus for more deck kinds; handout-master text |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..b148437a 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -878,6 +878,10 @@ impl Presentation {
         for md in &self.media {
             m = m.max(md.id.0);
         }
+        for extra in [self.notes_master.as_deref(), self.handout_master.as_deref()].into_iter().flatten() {
+            m = m.max(extra.id.0);
+            walk(&extra.shapes, &mut |sh, _| m = m.max(sh.id.0));
+        }
         self.next_id = m;
     }
     pub fn slide_index(&self, id: SlideId) -> Option<usize> {
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..047027eb 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -385,6 +385,35 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
         }
         p.notes_master = Some(Arc::new(m));
     }
+    // Handout master (header, footer, date and slide number for printed handouts).
+    if let Some(r) = pres_part.rels.first_of("handoutMaster")
+        && let Some(d) = load(&pkg, &r.target)
+    {
+        let part = Part::new(&pkg, &r.target, &d);
+        let mut ctx = shapes::IdCtx::default();
+        let mut m = Master { id: MasterId(imp.alloc()), name: "Handout Master".into(), ..Default::default() };
+        if let Some(t) = part.rels.first_of("theme")
+            && let Some(td) = pkg.xml(&t.target)
+        {
+            let tp = Part::new(&pkg, &t.target, &td);
+            m.theme = theme::read_theme(&mut imp, &tp, &td.root);
+        } else if let Some(first) = p.masters.first() {
+            m.theme = first.theme.clone();
+        }
+        if let Some(csld) = d.root.child("cSld") {
+            if let Some(n) = csld.attr("name").filter(|s| !s.is_empty()) {
+                m.name = n.to_string();
+            }
+            m.background = background(&mut imp, &part, csld);
+            if let Some(tree) = csld.child("spTree") {
+                m.shapes = shapes::sp_tree(&mut imp, &part, &mut ctx, tree, 0);
+            }
+        }
+        if let Some(cm) = d.root.child("clrMap") {
+            m.color_map = color_map(cm);
+        }
+        p.handout_master = Some(Arc::new(m));
+    }
     // Document properties.
     if let Some(r) = root_rels.first_of("core-properties")
         && let Some(d) = pkg.xml(&r.target)
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..f6e6c282 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -24,6 +24,7 @@ const CT_SLIDE: &str = "application/vnd.openxmlformats-officedocument.presentati
 const CT_LAYOUT: &str = "application/vnd.openxmlformats-officedocument.presentationml.slideLayout+xml";
 const CT_MASTER: &str = "application/vnd.openxmlformats-officedocument.presentationml.slideMaster+xml";
 const CT_NOTES_MASTER: &str = "application/vnd.openxmlformats-officedocument.presentationml.notesMaster+xml";
+const CT_HANDOUT_MASTER: &str = "application/vnd.openxmlformats-officedocument.presentationml.handoutMaster+xml";
 const CT_NOTES: &str = "application/vnd.openxmlformats-officedocument.presentationml.notesSlide+xml";
 const CT_THEME: &str = "application/vnd.openxmlformats-officedocument.theme+xml";
 const CT_PRES_PROPS: &str = "application/vnd.openxmlformats-officedocument.presentationml.presProps+xml";
@@ -459,6 +460,29 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         notes_master_rid = Some(pres.rels.add("notesMaster", &opc::relative("ppt/presentation.xml", notes_master), false));
     }
 
+    // Handout master. Its header, footer, date and slide-number text live on this part; a deck
+    // that has never had one does not gain an empty master on save.
+    let handout_path = "ppt/handoutMasters/handoutMaster1.xml";
+    let mut handout_rid = None;
+    if let Some(hm) = p.handout_master.as_ref() {
+        let tindex = p.masters.len() + 1 + usize::from(notes_master_rid.is_some());
+        let tname = format!("ppt/theme/theme{tindex}.xml");
+        let mut ho = Out::new(handout_path);
+        ho.rels.add("theme", &opc::relative(handout_path, &tname), false);
+        let mut to = Out::new(&tname);
+        let txml = theme::theme_xml(&mut x, &mut to, &hm.theme);
+        x.pkg.xml_part(&tname, CT_THEME, txml);
+        x.pkg.rels(&tname, &to.rels);
+        let mut w = W::new();
+        root_open(&mut w, "p:handoutMaster", A::new());
+        csld(&mut w, &mut x, &mut ho, &hm.name, hm.background.as_ref(), &hm.shapes);
+        clr_map(&mut w, &hm.color_map);
+        w.close("p:handoutMaster");
+        x.pkg.xml_part(handout_path, CT_HANDOUT_MASTER, w.finish());
+        x.pkg.rels(handout_path, &ho.rels);
+        handout_rid = Some(pres.rels.add("handoutMaster", &opc::relative("ppt/presentation.xml", handout_path), false));
+    }
+
     // Comment authors.
     let mut authors: Vec<(String, String, u32)> = vec![];
     let mut n_comments = 0u32;
@@ -514,7 +538,7 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
     x.pkg.xml_part("ppt/viewProps.xml", CT_VIEW_PROPS, view_props_xml());
     let ts = crate::tables::table_styles_xml(&x.table_styles, &p.table_styles);
     x.pkg.xml_part("ppt/tableStyles.xml", CT_TABLE_STYLES, ts);
-    let pxml = presentation_xml(&mut x, &mut pres, &master_rids, notes_master_rid.as_deref(), &slide_rids);
+    let pxml = presentation_xml(&mut x, &mut pres, &master_rids, notes_master_rid.as_deref(), handout_rid.as_deref(), &slide_rids);
     x.pkg.xml_part("ppt/presentation.xml", CT_PRES, pxml);
     x.pkg.rels("ppt/presentation.xml", &pres.rels);
 
@@ -665,7 +689,7 @@ fn section_slides(p: &Presentation) -> Vec<(String, Vec<usize>)> {
     out
 }
 
-fn presentation_xml(x: &mut Exp, o: &mut Out, masters: &[(u64, String)], notes: Option<&str>, slides: &[String]) -> Vec<u8> {
+fn presentation_xml(x: &mut Exp, o: &mut Out, masters: &[(u64, String)], notes: Option<&str>, handout: Option<&str>, slides: &[String]) -> Vec<u8> {
     let p = x.p;
     let mut w = W::new();
     let first = (p.first_slide_number != 1).then_some(p.first_slide_number.min(9999));
@@ -680,6 +704,11 @@ fn presentation_xml(x: &mut Exp, o: &mut Out, masters: &[(u64, String)], notes:
         w.empty("p:notesMasterId", A::new().a("r:id", n));
         w.close("p:notesMasterIdLst");
     }
+    if let Some(h) = handout {
+        w.open0("p:handoutMasterIdLst");
+        w.empty("p:handoutMasterId", A::new().a("r:id", h));
+        w.close("p:handoutMasterIdLst");
+    }
     if !slides.is_empty() {
         w.open0("p:sldIdLst");
         for (i, rid) in slides.iter().enumerate() {
diff --git a/crates/pptx/tests/corpus_kinds.rs b/crates/pptx/tests/corpus_kinds.rs
new file mode 100644
index 00000000..52dae76e
--- /dev/null
+++ b/crates/pptx/tests/corpus_kinds.rs
@@ -0,0 +1,605 @@
+//! Owned corpus of more deck kinds: tables, charts, animations, media, sections, masters and layouts.
+//!
+//! Each package is built here. The check is open → save → reopen: text in the package and the
+//! content parts. A second save keeps the same part names and text.
+
+use std::collections::BTreeMap;
+use std::io::{Cursor, Read, Write};
+use std::sync::Arc;
+
+use deckcraft_model::anim::{AnimStart, Animation, TextBuild};
+use deckcraft_model::chart::{Chart, ChartType};
+use deckcraft_model::style::PictureFill;
+use deckcraft_model::table::Table;
+use deckcraft_model::text::{Action, Hyperlink, Run, RunProps, TextBody};
+use deckcraft_model::{Geom, LayoutId, LayoutType, MasterId, MediaClip, PhType, Presentation, ShapeKind, Slide, defaults};
+
+fn png(w: u32, h: u32, rgb: [u8; 3]) -> Vec<u8> {
+    let img = image::RgbImage::from_pixel(w, h, image::Rgb(rgb));
+    let mut out = Cursor::new(vec![]);
+    image::DynamicImage::ImageRgb8(img).write_to(&mut out, image::ImageFormat::Png).expect("png");
+    out.into_inner()
+}
+
+fn shape(p: &mut Presentation, name: &str, x: f64, y: f64, w: f64, h: f64) -> deckcraft_model::Shape {
+    deckcraft_model::Shape {
+        id: deckcraft_model::ShapeId(p.alloc_id()),
+        name: name.into(),
+        xfrm: Some(deckcraft_geom::Xfrm::new(x, y, w, h)),
+        ..Default::default()
+    }
+}
+
+fn slide_with(p: &mut Presentation, kind: LayoutType, title: &str) -> Slide {
+    let layout = defaults::layout_of_kind(p, kind).unwrap_or_default();
+    let mut s = defaults::new_slide(p, layout);
+    if let Some(t) = s.shapes.first_mut() {
+        t.text = Some(TextBody::from_text(title));
+    }
+    s
+}
+
+fn tables() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let mut s = slide_with(&mut p, LayoutType::TitleOnly, "Regions");
+    let mut t = Table::new(3, 3, 420.0, 28.0);
+    for (r, c, text) in [
+        (0, 0, "Quarter"),
+        (0, 1, "Region"),
+        (0, 2, "Amount"),
+        (1, 0, "Q1"),
+        (1, 1, "North"),
+        (1, 2, "12"),
+        (2, 0, "Q2"),
+        (2, 1, "South"),
+        (2, 2, "Total"),
+    ] {
+        if let Some(cell) = t.cell_mut(r, c) {
+            cell.text = TextBody::from_text(text);
+        }
+    }
+    t.merge(2, 1, 1, 2);
+    t.style = "light2-accent3".into();
+    let mut ts = shape(&mut p, "Region table", 80.0, 140.0, 420.0, 84.0);
+    ts.kind = ShapeKind::Table(t);
+    s.shapes.push(ts);
+    p.slides = vec![Arc::new(s)];
+    p
+}
+
+fn chart_of(p: &mut Presentation, name: &str, kind: ChartType, title: &str, x: f64) -> deckcraft_model::Shape {
+    let mut chart = Chart::sample(kind);
+    chart.title = Some(title.into());
+    chart.categories = vec!["Jan".into(), "Feb".into()];
+    chart.series.truncate(1);
+    if let Some(series) = chart.series.first_mut() {
+        series.name = "Actual".into();
+        series.values = vec![Some(10.0), Some(20.0)];
+    }
+    if !matches!(kind, ChartType::Pie) {
+        chart.axis_titles = (Some("Month".into()), Some("Amount due".into()));
+    }
+    let mut ch = shape(p, name, x, 120.0, 280.0, 200.0);
+    ch.kind = ShapeKind::Chart(Box::new(chart));
+    ch
+}
+
+fn charts() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let mut s = slide_with(&mut p, LayoutType::Blank, "Charts");
+    s.shapes.extend([
+        chart_of(&mut p, "Column chart", ChartType::Column, "Revenue", 40.0),
+        chart_of(&mut p, "Line chart", ChartType::Line, "Trend", 340.0),
+        chart_of(&mut p, "Pie chart", ChartType::Pie, "Share", 640.0),
+    ]);
+    p.slides = vec![Arc::new(s)];
+    p
+}
+
+fn animations() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let mut s = slide_with(&mut p, LayoutType::TitleOnly, "Motion");
+    let mut flyer = shape(&mut p, "Flyer", 80.0, 160.0, 200.0, 80.0);
+    flyer.geom = Geom::preset("roundRect");
+    flyer.text = Some(TextBody::from_text("Fly in"));
+    let fly = flyer.id;
+    let mut built = shape(&mut p, "Build list", 360.0, 160.0, 240.0, 120.0);
+    built.text = Some(TextBody::from_text("One\nTwo\nThree"));
+    let body = built.id;
+    s.shapes.extend([flyer, built]);
+    s.animations = vec![
+        Animation { shape: fly, effect: "fly".into(), option: "l".into(), duration_ms: 750, ..Default::default() },
+        Animation {
+            shape: body,
+            effect: "fade".into(),
+            text_build: TextBuild::ByParagraph,
+            start: AnimStart::AfterPrevious,
+            duration_ms: 400,
+            ..Default::default()
+        },
+    ];
+    s.transition = Some(deckcraft_model::anim::Transition { kind: "wipe".into(), option: "l".into(), duration_ms: 800, ..Default::default() });
+    p.slides = vec![Arc::new(s)];
+    p
+}
+
+fn media() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let picture = p.add_media("mark.png", "image/png", png(4, 4, [20, 90, 160]));
+    let tone = p.add_media("tone.wav", "audio/wav", b"owned-wav-tone".to_vec());
+    let clip = p.add_media("clip.mp4", "video/mp4", b"owned-mp4-clip".to_vec());
+    let mut s = slide_with(&mut p, LayoutType::TitleOnly, "Media");
+    let mut pic = shape(&mut p, "Mark", 60.0, 120.0, 80.0, 80.0);
+    pic.kind = ShapeKind::Picture { fill: PictureFill { media: picture, ..Default::default() } };
+    pic.geom = Geom::preset("rect");
+    let mut audio = shape(&mut p, "Tone", 180.0, 120.0, 80.0, 80.0);
+    audio.kind = ShapeKind::Media(MediaClip { media: tone, video: false, bookmarks: vec![("Cue the demo".into(), 400)], ..Default::default() });
+    let mut video = shape(&mut p, "Clip", 300.0, 120.0, 160.0, 90.0);
+    video.kind = ShapeKind::Media(MediaClip { media: clip, video: true, poster: Some(picture), ..Default::default() });
+    s.shapes.extend([pic, audio, video]);
+    p.slides = vec![Arc::new(s)];
+    p
+}
+
+fn sections() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let mut first = slide_with(&mut p, LayoutType::Title, "Opening remarks");
+    if let Some(t) = first.shapes.get_mut(1) {
+        t.text = Some(TextBody {
+            paragraphs: vec![deckcraft_model::text::Paragraph {
+                runs: vec![Run::with(
+                    "Brief",
+                    RunProps {
+                        link: Some(Hyperlink {
+                            action: Action::Url { url: "https://example.org/brief?q=1&x=2".into() },
+                            tooltip: "Open the brief".into(),
+                            highlight_click: false,
+                        }),
+                        ..Default::default()
+                    },
+                )],
+                ..Default::default()
+            }],
+            ..Default::default()
+        });
+    }
+    let second = slide_with(&mut p, LayoutType::SectionHeader, "Figures");
+    let ids = [first.id, second.id];
+    p.slides = vec![Arc::new(first), Arc::new(second)];
+    p.sections = vec![
+        deckcraft_model::Section { name: "Opening".into(), slides: vec![ids[0]] },
+        deckcraft_model::Section { name: "Figures".into(), slides: vec![ids[1]] },
+    ];
+    p.custom_shows = vec![deckcraft_model::CustomShow { name: "Short show".into(), slides: vec![ids[0]] }];
+    p
+}
+
+fn masters() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    if let Some(m) = p.masters.first_mut() {
+        let m = Arc::make_mut(m);
+        if let Some(f) = m.shapes.iter_mut().find(|s| s.ph_type() == Some(PhType::Footer)) {
+            f.text = Some(TextBody::from_text("Slide footer line"));
+        }
+    }
+    let mut evening = (**p.masters.first().expect("master")).clone();
+    evening.id = MasterId(p.alloc_id());
+    evening.name = "Evening".into();
+    evening.shapes.retain(|s| s.ph_type().is_some());
+    let mut banner = shape(&mut p, "Evening banner", 40.0, 40.0, 400.0, 40.0);
+    banner.text = Some(TextBody::from_text("Evening master"));
+    evening.shapes.push(banner);
+    let mut quote = evening.layouts.first().expect("layout").clone();
+    quote.id = LayoutId(p.alloc_id());
+    quote.name = "Quote".into();
+    quote.kind = LayoutType::Custom;
+    quote.shapes.retain(|s| s.ph_type() == Some(PhType::CtrTitle) || s.ph_type() == Some(PhType::Title));
+    let mut line = shape(&mut p, "Quote line", 80.0, 200.0, 600.0, 80.0);
+    line.text = Some(TextBody::from_text("Pull quote"));
+    quote.shapes.push(line);
+    evening.layouts = vec![quote.clone()];
+    let quote_id = quote.id;
+    p.masters.push(Arc::new(evening));
+
+    let title = slide_with(&mut p, LayoutType::Title, "Welcome");
+    let agenda = slide_with(&mut p, LayoutType::SectionHeader, "Agenda");
+    let compared = slide_with(&mut p, LayoutType::Comparison, "Comparison");
+    let mut quoted = defaults::new_slide(&mut p, quote_id);
+    if let Some(t) = quoted.shapes.first_mut() {
+        t.text = Some(TextBody::from_text("A line"));
+    }
+    p.slides = vec![Arc::new(title), Arc::new(agenda), Arc::new(compared), Arc::new(quoted)];
+    p
+}
+
+struct Pkg {
+    parts: BTreeMap<String, Vec<u8>>,
+}
+
+impl Pkg {
+    fn open(bytes: &[u8]) -> Self {
+        let mut zip = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+        let mut parts = BTreeMap::new();
+        for i in 0..zip.len() {
+            let mut f = zip.by_index(i).expect("entry");
+            if f.is_dir() {
+                continue;
+            }
+            let name = f.name().trim_start_matches('/').to_string();
+            let mut data = vec![];
+            f.read_to_end(&mut data).expect("read");
+            parts.insert(name, data);
+        }
+        Pkg { parts }
+    }
+
+    fn bytes(&self) -> Vec<u8> {
+        let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+        let opts = zip::write::SimpleFileOptions::default();
+        for (n, data) in &self.parts {
+            out.start_file(n, opts).expect("start");
+            out.write_all(data).expect("write");
+        }
+        out.finish().expect("finish").into_inner()
+    }
+
+    fn text_mut(&mut self, name: &str, body: String) {
+        self.parts.insert(name.to_string(), body.into_bytes());
+    }
+}
+
+fn xml_text(parts: &BTreeMap<String, Vec<u8>>) -> BTreeMap<String, usize> {
+    let mut counts = BTreeMap::new();
+    for (name, bytes) in parts {
+        let lower = name.to_ascii_lowercase();
+        if !(lower.ends_with(".xml") || lower.ends_with(".rels")) {
+            continue;
+        }
+        let Ok(xml) = std::str::from_utf8(bytes) else { continue };
+        for tag in ["a:t", "c:v", "p:text", "dc:title", "dc:subject", "dc:creator", "dc:description"] {
+            for text in element_texts(xml, tag) {
+                if !text.is_empty() {
+                    *counts.entry(text).or_insert(0) += 1;
+                }
+            }
+        }
+        for tag in ["p:cSld", "p14:section", "p:custShow"] {
+            for text in tag_attr(xml, tag, "name") {
+                if !text.is_empty() {
+                    *counts.entry(text).or_insert(0) += 1;
+                }
+            }
+        }
+        for url in attr_values(xml, "Target") {
+            if url.starts_with("http://") || url.starts_with("https://") {
+                *counts.entry(url).or_insert(0) += 1;
+            }
+        }
+        for tip in attr_values(xml, "tooltip") {
+            if !tip.is_empty() {
+                *counts.entry(tip).or_insert(0) += 1;
+            }
+        }
+    }
+    counts
+}
+
+fn element_texts(xml: &str, tag: &str) -> Vec<String> {
+    let mut out = vec![];
+    let open = format!("<{tag}");
+    let mut rest = xml;
+    while let Some(i) = rest.find(&open) {
+        let after = &rest[i + open.len()..];
+        let boundary = after.chars().next();
+        if !matches!(boundary, Some('>' | '/' | ' ' | '\n' | '\t' | '\r')) {
+            rest = after;
+            continue;
+        }
+        let Some(gt) = after.find('>') else { break };
+        if after.as_bytes().get(gt.saturating_sub(1)) == Some(&b'/') {
+            rest = &after[gt + 1..];
+            continue;
+        }
+        let body = &after[gt + 1..];
+        let close = format!("</{tag}>");
+        let Some(end) = body.find(&close) else { break };
+        out.push(decode_xml(&body[..end]));
+        rest = &body[end + close.len()..];
+    }
+    out
+}
+
+fn tag_attr(xml: &str, tag: &str, attr: &str) -> Vec<String> {
+    let mut out = vec![];
+    let open = format!("<{tag}");
+    let mut rest = xml;
+    while let Some(i) = rest.find(&open) {
+        let after = &rest[i..];
+        let Some(gt) = after.find('>') else { break };
+        let start = after[..gt].find(&format!("{attr}=\"")).map(|k| k + attr.len() + 2);
+        if let Some(start) = start
+            && let Some(end) = after[start..gt].find('"')
+        {
+            out.push(decode_xml(&after[start..start + end]));
+        }
+        rest = &after[gt + 1..];
+    }
+    out
+}
+
+fn attr_values(xml: &str, name: &str) -> Vec<String> {
+    let mut out = vec![];
+    let key = format!("{name}=\"");
+    let mut rest = xml;
+    while let Some(i) = rest.find(&key) {
+        let after = &rest[i + key.len()..];
+        let Some(end) = after.find('"') else { break };
+        out.push(decode_xml(&after[..end]));
+        rest = &after[end + 1..];
+    }
+    out
+}
+
+fn decode_xml(s: &str) -> String {
+    let mut out = String::new();
+    let mut rest = s;
+    while let Some(i) = rest.find('&') {
+        out.push_str(&rest[..i]);
+        let after = &rest[i..];
+        let Some(end) = after.find(';') else {
+            out.push_str(after);
+            return out;
+        };
+        let ent = &after[1..end];
+        let ch = match ent {
+            "amp" => "&".into(),
+            "lt" => "<".into(),
+            "gt" => ">".into(),
+            "quot" => "\"".into(),
+            "apos" => "'".into(),
+            hex if hex.starts_with("#x") || hex.starts_with("#X") => {
+                u32::from_str_radix(&hex[2..], 16).ok().and_then(char::from_u32).map(|c| c.to_string()).unwrap_or_default()
+            }
+            dec if dec.starts_with('#') => dec[1..].parse::<u32>().ok().and_then(char::from_u32).map(|c| c.to_string()).unwrap_or_default(),
+            _ => String::new(),
+        };
+        out.push_str(&ch);
+        rest = &after[end + 1..];
+    }
+    out.push_str(rest);
+    out
+}
+
+fn part_count(parts: &BTreeMap<String, Vec<u8>>, pred: impl Fn(&str) -> bool) -> usize {
+    parts.keys().filter(|n| pred(n)).count()
+}
+
+/// Slides, charts, media, comments, handout masters.
+fn content_counts(parts: &BTreeMap<String, Vec<u8>>) -> [usize; 5] {
+    let is = |prefix: &str, name: &str| {
+        let n = name.to_ascii_lowercase();
+        n.starts_with(prefix) && n.ends_with(".xml") && !n.contains("_rels")
+    };
+    [
+        part_count(parts, |n| is("ppt/slides/slide", n)),
+        part_count(parts, |n| is("ppt/charts/chart", n)),
+        part_count(parts, |n| n.to_ascii_lowercase().starts_with("ppt/media/") && !n.to_ascii_lowercase().contains("_rels")),
+        part_count(parts, |n| is("ppt/comments/comment", n)),
+        part_count(parts, |n| is("ppt/handoutmasters/handoutmaster", n)),
+    ]
+}
+
+fn lost<'a>(origin: &'a BTreeMap<String, usize>, saved: &BTreeMap<String, usize>) -> Vec<(&'a str, usize, usize)> {
+    origin
+        .iter()
+        .filter_map(|(s, n)| {
+            let got = saved.get(s).copied().unwrap_or(0);
+            (got < *n).then_some((s.as_str(), *n, got))
+        })
+        .collect()
+}
+
+fn round_trip(label: &str, bytes: &[u8]) -> (Pkg, Pkg) {
+    let origin = Pkg::open(bytes);
+    let once = deckcraft_pptx::export(&deckcraft_pptx::import(bytes).unwrap_or_else(|e| panic!("{label}: import: {e}")))
+        .unwrap_or_else(|e| panic!("{label}: save: {e}"));
+    let saved = Pkg::open(&once);
+    let origin_text = xml_text(&origin.parts);
+    let missing = lost(&origin_text, &xml_text(&saved.parts));
+    assert!(missing.is_empty(), "{label}: text lost on save: {missing:?}");
+    assert_eq!(content_counts(&origin.parts), content_counts(&saved.parts), "{label}: content parts changed");
+    let again = deckcraft_pptx::export(&deckcraft_pptx::import(&once).unwrap_or_else(|e| panic!("{label}: reopen: {e}")))
+        .unwrap_or_else(|e| panic!("{label}: second save: {e}"));
+    let saved2 = Pkg::open(&again);
+    assert_eq!(saved.parts.keys().collect::<Vec<_>>(), saved2.parts.keys().collect::<Vec<_>>(), "{label}: part names changed on the second save");
+    assert_eq!(xml_text(&saved.parts), xml_text(&saved2.parts), "{label}: text changed on the second save");
+    (origin, saved)
+}
+
+fn require(text: &BTreeMap<String, usize>, label: &str, words: &[&str]) {
+    for s in words {
+        assert!(text.contains_key(*s), "{label} corpus is missing {s:?}");
+    }
+}
+
+fn ph(id: u32, kind: &str, name: &str, text: &str) -> String {
+    format!(
+        "<p:sp><p:nvSpPr><p:cNvPr id=\"{id}\" name=\"{name}\"/><p:cNvSpPr/><p:nvPr><p:ph type=\"{kind}\"/></p:nvPr></p:nvSpPr>\
+         <p:spPr><a:xfrm><a:off x=\"0\" y=\"0\"/><a:ext cx=\"3657600\" cy=\"365760\"/></a:xfrm><a:prstGeom prst=\"rect\"><a:avLst/></a:prstGeom></p:spPr>\
+         <p:txBody><a:bodyPr/><a:lstStyle/><a:p><a:r><a:t>{text}</a:t></a:r></a:p></p:txBody></p:sp>"
+    )
+}
+
+fn next_rid(rels: &str) -> String {
+    let mut max = 0u32;
+    let mut rest = rels;
+    while let Some(i) = rest.find("rId") {
+        let digits: String = rest[i + 3..].chars().take_while(|c| c.is_ascii_digit()).collect();
+        if let Ok(n) = digits.parse::<u32>() {
+            max = max.max(n);
+        }
+        rest = &rest[i + 3..];
+    }
+    format!("rId{}", max + 1)
+}
+
+/// A deck whose handout master carries the header, footer, date and slide number.
+fn handout_deck() -> Vec<u8> {
+    let mut p = defaults::new_presentation(None);
+    let s = slide_with(&mut p, LayoutType::TitleOnly, "Leave-behind");
+    p.slides = vec![Arc::new(s)];
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut pkg = Pkg::open(&bytes);
+    let master = format!(
+        "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\
+         <p:handoutMaster xmlns:a=\"http://schemas.openxmlformats.org/drawingml/2006/main\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\" xmlns:p=\"http://schemas.openxmlformats.org/presentationml/2006/main\">\
+         <p:cSld name=\"Handouts\"><p:spTree>\
+         <p:nvGrpSpPr><p:cNvPr id=\"1\" name=\"\"/><p:cNvGrpSpPr/><p:nvPr/></p:nvGrpSpPr><p:grpSpPr/>\
+         {}{}{}{}\
+         </p:spTree></p:cSld>\
+         <p:clrMap bg1=\"lt1\" tx1=\"dk1\" bg2=\"lt2\" tx2=\"dk2\" accent1=\"accent1\" accent2=\"accent2\" accent3=\"accent3\" accent4=\"accent4\" accent5=\"accent5\" accent6=\"accent6\" hlink=\"hlink\" folHlink=\"folHlink\"/>\
+         </p:handoutMaster>",
+        ph(2, "hdr", "Header Placeholder 1", "Board pack"),
+        ph(3, "ftr", "Footer Placeholder 2", "Not for circulation"),
+        ph(4, "dt", "Date Placeholder 3", "1 March 2026"),
+        ph(5, "sldNum", "Slide Number Placeholder 4", "3"),
+    );
+    pkg.parts.insert("ppt/handoutMasters/handoutMaster1.xml".into(), master.into_bytes());
+    pkg.parts.insert(
+        "ppt/handoutMasters/_rels/handoutMaster1.xml.rels".into(),
+        b"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\
+          <Relationships xmlns=\"http://schemas.openxmlformats.org/package/2006/relationships\">\
+          <Relationship Id=\"rId1\" Type=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme\" Target=\"../theme/theme1.xml\"/>\
+          </Relationships>"
+            .to_vec(),
+    );
+    let rels_name = "ppt/_rels/presentation.xml.rels";
+    let rels = String::from_utf8(pkg.parts.get(rels_name).expect("rels").clone()).expect("utf8");
+    let rid = next_rid(&rels);
+    let rels = rels.replacen(
+        "</Relationships>",
+        &format!(
+            "<Relationship Id=\"{rid}\" Type=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships/handoutMaster\" Target=\"handoutMasters/handoutMaster1.xml\"/></Relationships>"
+        ),
+        1,
+    );
+    pkg.text_mut(rels_name, rels);
+    let pres_name = "ppt/presentation.xml";
+    let pres = String::from_utf8(pkg.parts.get(pres_name).expect("presentation").clone()).expect("utf8");
+    let list = format!("<p:handoutMasterIdLst><p:handoutMasterId r:id=\"{rid}\"/></p:handoutMasterIdLst>");
+    let pres = if let Some(at) = pres.find("<p:sldIdLst") {
+        let mut out = String::new();
+        out.push_str(&pres[..at]);
+        out.push_str(&list);
+        out.push_str(&pres[at..]);
+        out
+    } else {
+        pres.replacen("<p:sldSz", &format!("{list}<p:sldSz"), 1)
+    };
+    pkg.text_mut(pres_name, pres);
+    let ct = String::from_utf8(pkg.parts.get("[Content_Types].xml").expect("types").clone()).expect("utf8");
+    let ct = ct.replacen(
+        "</Types>",
+        "<Override PartName=\"/ppt/handoutMasters/handoutMaster1.xml\" ContentType=\"application/vnd.openxmlformats-officedocument.presentationml.handoutMaster+xml\"/></Types>",
+        1,
+    );
+    pkg.text_mut("[Content_Types].xml", ct);
+    pkg.bytes()
+}
+
+fn placeholder_text(p: &Presentation, kind: PhType) -> String {
+    p.handout_master
+        .as_ref()
+        .and_then(|m| m.shapes.iter().find(|s| s.ph_type() == Some(kind)))
+        .and_then(|s| s.text.as_ref())
+        .map(|t| t.text())
+        .unwrap_or_default()
+}
+
+#[test]
+fn authored_kinds_round_trip_parts_and_text() {
+    let tables_bytes = deckcraft_pptx::export(&tables()).expect("tables");
+    let (origin, _) = round_trip("tables", &tables_bytes);
+    require(&xml_text(&origin.parts), "tables", &["Quarter", "North", "12", "Total", "Regions"]);
+    assert_eq!(content_counts(&origin.parts), [1, 0, 0, 0, 0]);
+
+    let charts_bytes = deckcraft_pptx::export(&charts()).expect("charts");
+    let (origin, _) = round_trip("charts", &charts_bytes);
+    require(&xml_text(&origin.parts), "charts", &["Revenue", "Trend", "Share", "Actual", "Jan", "Feb", "Month", "Amount due"]);
+    assert_eq!(content_counts(&origin.parts), [1, 3, 0, 0, 0]);
+
+    let anim_bytes = deckcraft_pptx::export(&animations()).expect("animations");
+    let (origin, saved) = round_trip("animations", &anim_bytes);
+    require(&xml_text(&origin.parts), "animations", &["Motion", "Fly in", "One", "Two", "Three"]);
+    let anim = deckcraft_pptx::import(&saved.bytes()).expect("animations import");
+    assert_eq!(anim.slides[0].animations.len(), 2);
+    assert_eq!(anim.slides[0].animations[0].effect, "fly");
+    assert_eq!(anim.slides[0].animations[1].text_build, TextBuild::ByParagraph);
+    assert_eq!(anim.slides[0].transition.as_ref().map(|t| t.kind.as_str()), Some("wipe"));
+
+    let media_bytes = deckcraft_pptx::export(&media()).expect("media");
+    let (origin, saved) = round_trip("media", &media_bytes);
+    require(&xml_text(&origin.parts), "media", &["Media"]);
+    let mark = png(4, 4, [20, 90, 160]);
+    assert!(saved.parts.values().any(|b| b == &mark), "the picture bytes did not survive the save");
+    assert!(saved.parts.values().any(|b| b == b"owned-wav-tone"), "the audio bytes did not survive the save");
+    assert!(saved.parts.values().any(|b| b == b"owned-mp4-clip"), "the video bytes did not survive the save");
+    assert!(content_counts(&origin.parts)[2] >= 3, "picture, audio and video");
+    let media = deckcraft_pptx::import(&saved.bytes()).expect("media import");
+    let tone = media.slides[0].shapes.iter().find(|s| s.name == "Tone").expect("tone");
+    let ShapeKind::Media(clip) = &tone.kind else { panic!("not media") };
+    assert_eq!(clip.bookmarks, vec![("Cue the demo".into(), 400)]);
+    assert!(!clip.video);
+
+    let section_bytes = deckcraft_pptx::export(&sections()).expect("sections");
+    let (origin, saved) = round_trip("sections", &section_bytes);
+    require(
+        &xml_text(&origin.parts),
+        "sections",
+        &["Opening remarks", "Brief", "Figures", "Opening", "Short show", "https://example.org/brief?q=1&x=2", "Open the brief"],
+    );
+    let sections = deckcraft_pptx::import(&saved.bytes()).expect("sections import");
+    assert_eq!(sections.sections.iter().map(|s| s.name.as_str()).collect::<Vec<_>>(), vec!["Opening", "Figures"]);
+    assert_eq!(sections.custom_shows[0].name, "Short show");
+
+    let master_bytes = deckcraft_pptx::export(&masters()).expect("masters");
+    let (origin, saved) = round_trip("masters", &master_bytes);
+    require(
+        &xml_text(&origin.parts),
+        "masters",
+        &[
+            "Welcome",
+            "Agenda",
+            "Comparison",
+            "Pull quote",
+            "Evening",
+            "Evening master",
+            "Quote",
+            "Slide footer line",
+            "Title Slide",
+            "Section Header",
+        ],
+    );
+    let masters = deckcraft_pptx::import(&saved.bytes()).expect("masters import");
+    assert_eq!(masters.masters.len(), 2);
+    assert!(masters.masters.iter().any(|m| m.name == "Evening"));
+    assert!(masters.masters.iter().flat_map(|m| &m.layouts).any(|l| l.name == "Quote" && l.kind == LayoutType::Custom));
+
+    let handout = handout_deck();
+    let (origin, _) = round_trip("handout master", &handout);
+    require(&xml_text(&origin.parts), "handout", &["Leave-behind", "Board pack", "Not for circulation", "1 March 2026", "Handouts"]);
+    assert_eq!(content_counts(&origin.parts)[4], 1, "handout master part");
+    let opened = deckcraft_pptx::import(&handout).expect("import handout");
+    assert_eq!(opened.handout_master.as_ref().map(|m| m.name.as_str()), Some("Handouts"));
+    assert_eq!(placeholder_text(&opened, PhType::Header), "Board pack");
+    assert_eq!(placeholder_text(&opened, PhType::Footer), "Not for circulation");
+    assert_eq!(placeholder_text(&opened, PhType::Date), "1 March 2026");
+    assert_eq!(placeholder_text(&opened, PhType::SlideNum), "3");
+    let saved = deckcraft_pptx::export(&opened).expect("save handout");
+    let reopened = deckcraft_pptx::import(&saved).expect("reopen handout");
+    assert_eq!(placeholder_text(&reopened, PhType::Header), "Board pack");
+    assert_eq!(placeholder_text(&reopened, PhType::Footer), "Not for circulation");
+    assert_eq!(placeholder_text(&reopened, PhType::Date), "1 March 2026");
+    assert_eq!(placeholder_text(&reopened, PhType::SlideNum), "3");
+    assert_eq!(reopened.slides[0].shapes.first().and_then(|s| s.text.as_ref()).map(|t| t.text()).unwrap_or_default(), "Leave-behind");
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..0da5e120 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus for tables, charts, animations, media, sections and masters; handout-master text kept; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -16,7 +16,7 @@ PowerPoint opens and saves; Viewer = opens only).
 
 | Format | PowerPoint | DeckCraft read | DeckCraft write | Fidelity / notes | Tested by |
 |---|---|---|---|---|---|
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); never measured on real decks | `crates/pptx/tests/roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs` (30 tests); opened in PowerPoint by hand 2026-10-06 |
+| `.pptx` presentation | Editor | yes | yes | Broad (see below); corpus is decks we author, not measured against PowerPoint renders | `crates/pptx/tests/corpus_kinds.rs`, `roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
 | `.potx` template | Editor | yes (as a presentation) | no: written with the `.pptx` content type | `file.saveTemplate` is Save As under another name | none |
 | `.ppsx` slide show | Editor | yes (as a presentation) | no: written as `.pptx` content | Doesn't start in show mode | none |
 | `.pptm` / `.potm` / `.ppsm` macro-enabled | Editor | no | no | Should open and keep `vbaProject.bin` without running it | none |
@@ -62,7 +62,7 @@ the round trip even though DeckCraft doesn't model it.
 | Slide masters, layouts, placeholders and inheritance | yes | yes | |
 | Themes: colour, font (Latin/EA/CS), effect schemes, background styles | yes | yes | Unknown theme parts kept |
 | Notes slides and notes master | yes | yes | No notes-master editing view |
-| Handout master | no | no | |
+| Handout master | yes | yes | Header, footer, date and slide-number text is kept. No handout-master editing view |
 | Shapes: preset geometry (~180 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in `crates/geom/src/preset.rs` (and `preset/extra.rs`). Outlines, dashes, arrowheads and ink inside a group, and text, keep their size in points whatever the group's child-coordinate scale (#233). |
 | Fills: solid, gradient, picture (stretch/tile/crop), pattern, group | yes | yes | |
 | Lines: dash, compound, caps, joins, arrowheads | yes | yes | |
@@ -89,9 +89,10 @@ the round trip even though DeckCraft doesn't model it.
 
 ### What would move the PPTX number
 
-1. An owned corpus of real-world-shaped decks (corporate templates, SmartArt, chartex charts, EMF,
-   embedded fonts, every transition and animation) in a corpus repo, with import → render → export
-   → re-import checks in CI and a PowerPoint reference render for each (owner runs PowerPoint).
+1. A larger owned corpus (corporate templates, SmartArt, chartex charts, EMF, embedded fonts,
+   every transition and animation) in a corpus repo, with a PowerPoint reference render for each.
+   `crates/pptx/tests/corpus_kinds.rs` already checks tables, charts, animations, media, sections
+   and masters/layouts (open → save → reopen).
 2. The round-trip losses above (#70, #74, #77).
 3. SVG rendering, and clip regions inside EMF/WMF.
 
@@ -99,6 +100,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Owned corpus round-trip for tables, charts, animations, media, sections and masters. Handout-master header, footer, date and slide-number text is written back |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..40a27c9a 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned PPTX corpus for more deck kinds; handout-master text kept; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -17,7 +17,7 @@ revision history.
 
 | # | Gap | Category | Beta | Hours | Doc |
 |---|---|---|:-:|---|---|
-| 1 | PPTX never tested against a corpus of real decks | File format | B | 20–35 | [file-format-parity.md](file-format-parity.md) |
+| 1 | PPTX corpus is only decks we author (no PowerPoint reference renders) | File format | B | 20–35 | [file-format-parity.md](file-format-parity.md) |
 | 2 | Data loss and crashes on common paths (#60, #40, #59) | Stability | B | 6–12 | this file |
 | 3 | PPTX round trip drops comment threads, media options, rewind (#70, #74, #77) | File format | B | 3–6 | [file-format-parity.md](file-format-parity.md) |
 | 4 | SVG pictures don't render (EMF/WMF do) | File format | B | 6–12 | [file-format-parity.md](file-format-parity.md) |
@@ -58,12 +58,13 @@ revision history.
 
 Detail in [file-format-parity.md](file-format-parity.md).
 
-### PPTX has never met a corpus of real decks
-- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests) uses decks DeckCraft generates;
-  the 2026-10-07 alpha checklist already listed this as open. No reference renders from PowerPoint
-  exist to compare against.
+### PPTX corpus is only decks we author
+- **Evidence:** `crates/pptx/tests/corpus_kinds.rs` builds decks in this repo and checks open → save →
+  reopen (package parts and text): tables, charts, animations, media, sections, and several masters
+  and layouts. A handout master with a header, footer, date and slide number used to disappear on
+  save; that text is kept now. There is still no larger corpus and no reference render from PowerPoint.
 - **Impact:** the main reason to switch is "open my PowerPoint decks". Fidelity on real decks
-  (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is unknown.
+  (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is still mostly unknown.
 - **Estimate:** 20–35 h: build an owned corpus in `storytold/photocraft-corpus` style (craftrules
   `standards/test-corpora.md`), add import → render → export → re-import checks, have the owner open
   outputs in PowerPoint, fix what breaks. **Beta blocker.**
@@ -160,8 +161,8 @@ Detail in [file-format-parity.md](file-format-parity.md).
 Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a **beta blocker**.
 
 ### Notes and Handout masters
-- **Evidence:** checklist row missing; PPTX writes a notes master but there's no view to edit it,
-  and no handout master at all.
+- **Evidence:** checklist row missing the editing view. PPTX writes a notes master, and a handout
+  master's header, footer, date and slide number are kept. There is no view to edit either master.
 - **Estimate:** 4–6 h.
 
 ### Edit points, text warp, 3-D
@@ -256,6 +257,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Owned PPTX corpus for tables, charts, animations, media, sections and masters. Handout-master text is kept; the corpus gap is now a larger set and PowerPoint reference renders |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..625516b4 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus covers more deck kinds; handout-master text kept; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -26,8 +26,9 @@ points and lead the beta plan.
 
 1. **Stop losing work and crashing:** land Close's save prompt (#60, PR #75), the Windows GPU
    startup crashes (#40, #59), image paste on Windows/Linux (#53). 6–12 h.
-2. **PPTX on real decks:** build an owned corpus, round-trip checks in CI, fix what breaks;
-   comment threads, media options and rewind on save (#70, #74, #77); EMF/WMF and SVG. 31–55 h.
+2. **PPTX on real decks:** `crates/pptx/tests/corpus_kinds.rs` round-trips tables, charts, animations,
+   media, sections and masters/layouts, and keeps a handout master's header and footer. Still open:
+   a larger corpus, comment threads, media options and rewind (#70, #74, #77), EMF/WMF and SVG. 31–55 h.
 3. **Review the open PRs:** equations (#55), browser print (#66), Morph alignment (#67), macOS
    open-with (#68), font lookup (#80), Ukrainian (#34, after the catalog exists). 4–8 h.
 
@@ -96,7 +97,7 @@ on common paths. On 2026-10-07 it was ~80% there with these blockers:
 | Blocker (2026-10-07) | Status 2026-10-10 |
 |---|---|
 | First real release run: signing, notarization, installers verified on each OS | Signed releases v0.1.0–v0.4.0 published; installers not hand-checked on each OS; Windows startup crashes on some GPUs (#40, #59) |
-| PPTX fidelity on a corpus of real decks | Still open; now beta item 2 |
+| PPTX fidelity on a corpus of real decks | First owned check of tables, charts, animations, media, sections and masters; handout-master text kept. A larger corpus is still beta item 2 |
 | Presenter view and Animation Pane polish | Still open; beta items 9 and 10 |
 | Soak and fuzz the editor | Still open; beta item 1 |
 | UI fidelity pass on the most-used ribbon groups and dialogs; first run | Partly (start-screen fixes #20, #49); beta item 11 |
@@ -109,5 +110,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Owned PPTX corpus covers tables, charts, animations, media, sections and masters; handout-master text kept. Beta item 2 stays open for a larger corpus |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |

From 3f31f9951c0ba93f984239a25925c2c493815b91 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:08:56 +0300
Subject: [PATCH 169/376] =?UTF-8?q?PPTX:=20read=20Office=202016=20charts?=
 =?UTF-8?q?=20(waterfall,=20funnel,=20treemap=E2=80=A6)=20and=20keep=20the?=
 =?UTF-8?q?m?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Waterfall, funnel, treemap, sunburst, histogram, Pareto and box &
whisker charts live in a chartEx part behind an mc:AlternateContent
choice requiring cx1. DeckCraft took the fallback, usually a text box
saying the chart isn't available, so these charts were lost on open
and on save.

The cx1 choice is now taken for chartEx frames and the part is read
into the chart model: categories (innermost level), values, number
format, series name, title, legend and data labels. Unchanged charts
are written back as their chartEx part in a cx1 choice with a plain
chart of the same data as fallback, as PowerPoint writes them; an
edited one is saved as a plain chart. Region maps are not read.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/pptx/src/read/chart.rs   |   2 +-
 crates/pptx/src/read/chartex.rs | 128 ++++++++++++++++++++++++++++++++
 crates/pptx/src/read/mod.rs     |  16 +++-
 crates/pptx/src/read/shapes.rs  |   2 +-
 crates/pptx/src/write/chart.rs  |  23 ++++++
 crates/pptx/src/write/mod.rs    |  13 ++++
 crates/pptx/src/write/shapes.rs |  22 +++++-
 crates/pptx/tests/roundtrip.rs  | 117 +++++++++++++++++++++++++++++
 docs/gaps.md                    |   5 +-
 9 files changed, 321 insertions(+), 7 deletions(-)
 create mode 100644 crates/pptx/src/read/chartex.rs

diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 6d7541ff..7cecf457 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -26,7 +26,7 @@ fn simple_line(sp: Option<&El>) -> Option<deckcraft_model::Line> {
     Some(l)
 }
 
-fn rich_text(t: &El) -> Option<String> {
+pub(crate) fn rich_text(t: &El) -> Option<String> {
     let tx = t.child("tx")?;
     if let Some(r) = tx.child("rich") {
         let s = r.children_named("p").map(|p| p.text()).collect::<Vec<_>>().join("\n");
diff --git a/crates/pptx/src/read/chartex.rs b/crates/pptx/src/read/chartex.rs
new file mode 100644
index 00000000..ac14c97b
--- /dev/null
+++ b/crates/pptx/src/read/chartex.rs
@@ -0,0 +1,128 @@
+//! Office 2016 charts (`cx:chartSpace`, the `chartEx` part): waterfall, funnel, treemap,
+//! sunburst, histogram, Pareto and box & whisker. Their data sits in `cx:chartData` as levels of
+//! points, and each series names its layout (`layoutId`).
+
+use super::chart::rich_text;
+use crate::xml::El;
+use deckcraft_model::chart::{Chart, ChartType, Series};
+use std::collections::HashMap;
+
+/// Points per level and levels per dimension we keep (guards against hostile parts).
+const MAX_POINTS: usize = 100_000;
+
+/// One `cx:data`: its categories (the innermost level) and named numeric dimensions.
+#[derive(Default)]
+struct Data {
+    categories: Vec<String>,
+    numbers: HashMap<String, (Vec<Option<f64>>, Option<String>)>,
+}
+
+/// A level's points, by `idx`.
+fn points(lvl: &El) -> Vec<String> {
+    let n = lvl.u32("ptCount").unwrap_or(0).min(MAX_POINTS as u32) as usize;
+    let mut out = vec![String::new(); n];
+    for pt in lvl.children_named("pt").take(MAX_POINTS) {
+        let i = pt.u32("idx").unwrap_or(0) as usize;
+        if i >= MAX_POINTS {
+            continue;
+        }
+        if i >= out.len() {
+            out.resize(i + 1, String::new());
+        }
+        if let Some(s) = out.get_mut(i) {
+            *s = pt.text();
+        }
+    }
+    out
+}
+
+fn data(d: &El) -> Data {
+    let mut out = Data::default();
+    for dim in d.elements() {
+        // The first level is the innermost: a treemap's leaves, a waterfall's categories.
+        let Some(lvl) = dim.child("lvl") else { continue };
+        let ty = dim.attr("type").unwrap_or("");
+        if dim.is("strDim") || (dim.is("numDim") && ty == "cat") {
+            if ty == "cat" || out.categories.is_empty() {
+                out.categories = points(lvl);
+            }
+        } else if dim.is("numDim") {
+            let vals = points(lvl).into_iter().map(|s| s.trim().parse::<f64>().ok().filter(|v| v.is_finite())).collect();
+            out.numbers.insert(ty.to_string(), (vals, lvl.attr("formatCode").map(str::to_string)));
+        }
+    }
+    out
+}
+
+fn kind_of(layout: &str) -> Option<ChartType> {
+    Some(match layout {
+        "waterfall" => ChartType::Waterfall,
+        "funnel" => ChartType::Funnel,
+        "treemap" => ChartType::Treemap,
+        "sunburst" => ChartType::Sunburst,
+        "clusteredColumn" => ChartType::Histogram,
+        "boxWhisker" => ChartType::BoxWhisker,
+        _ => return None,
+    })
+}
+
+/// Parse a `chartEx` part. `None` for anything else, and for layouts DeckCraft has no type
+/// for (region maps).
+pub fn read_chartex_xml(bytes: &[u8]) -> Option<Chart> {
+    let doc = crate::xml::parse(bytes).ok()?;
+    let mut root = doc.root;
+    super::resolve_mc(&mut root, 0);
+    let mut c = chartex_from(&root)?;
+    c.raw = Some(String::from_utf8_lossy(bytes).into_owned());
+    Some(c)
+}
+
+pub(crate) fn chartex_from(root: &El) -> Option<Chart> {
+    if !root.is("chartSpace") {
+        return None;
+    }
+    let datas: HashMap<String, Data> =
+        root.child("chartData")?.children_named("data").map(|d| (d.attr("id").unwrap_or("0").to_string(), data(d))).collect();
+    let ch = root.child("chart")?;
+    let region = ch.child("plotArea")?.child("plotAreaRegion")?;
+    let mut c = Chart { categories: vec![], series: vec![], title: None, legend: None, gridlines: false, ..Default::default() };
+    c.title = ch.child("title").map(|t| rich_text(t).filter(|s| !s.is_empty()).unwrap_or_else(|| "Chart Title".into()));
+    c.legend = ch.child("legend").map(|l| l.attr("pos").unwrap_or("t").to_string());
+    let mut kind = None;
+    for s in region.children_named("series") {
+        let layout = s.attr("layoutId").unwrap_or("");
+        if layout == "paretoLine" {
+            // The cumulative line PowerPoint adds to a Pareto histogram.
+            kind = Some(ChartType::Pareto);
+            continue;
+        }
+        let k = kind_of(layout)?;
+        if s.bool("hidden") == Some(true) {
+            continue;
+        }
+        kind = Some(match kind {
+            Some(ChartType::Pareto) => ChartType::Pareto,
+            _ => k,
+        });
+        let d = datas.get(s.child("dataId").and_then(|i| i.attr("val")).unwrap_or("0"))?;
+        let (values, format) =
+            ["val", "size"].iter().find_map(|t| d.numbers.get(*t)).or_else(|| d.numbers.values().next()).cloned().unwrap_or_default();
+        if c.categories.is_empty() {
+            c.categories = d.categories.clone();
+        }
+        let name = s.child("tx").and_then(|t| t.find("v")).map(|v| v.text()).unwrap_or_default();
+        c.series.push(Series {
+            name,
+            values,
+            data_labels: s.child("dataLabels").map(|l| l.bool("hidden") != Some(true)),
+            number_format: format,
+            ..Default::default()
+        });
+    }
+    c.kind = kind?;
+    c.data_labels = c.series.iter().any(|s| s.data_labels == Some(true));
+    c.vary_colors = matches!(c.kind, ChartType::Funnel | ChartType::Treemap | ChartType::Sunburst | ChartType::Waterfall);
+    // Waterfall, histogram and box charts have a value axis with gridlines by default.
+    c.gridlines = matches!(c.kind, ChartType::Waterfall | ChartType::Histogram | ChartType::Pareto | ChartType::BoxWhisker);
+    Some(c)
+}
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..f48e6223 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -1,12 +1,14 @@
 //! PPTX import: package → [`Presentation`].
 
 mod chart;
+mod chartex;
 pub(crate) mod dml;
 mod shapes;
 mod theme;
 mod timing;
 
 pub(crate) use chart::{chart_from as chart_from_el, read_chart_xml};
+pub(crate) use chartex::{chartex_from, read_chartex_xml};
 
 use std::collections::{HashMap, HashSet};
 use std::sync::Arc;
@@ -117,7 +119,16 @@ pub fn keep_xml(el: &El, ns: &[(String, String)]) -> String {
 }
 
 /// Namespace prefixes whose `mc:Choice` content we understand.
-const SUPPORTED_MC: [&str; 9] = ["p14", "p15", "p159", "a14", "a16", "p1510", "a15", "c14", "p188"];
+const SUPPORTED_MC: [&str; 10] = ["p14", "p15", "p159", "a14", "a16", "p1510", "a15", "c14", "p188", "cx1"];
+
+/// Office 2016 charts sit in a `cx1` choice; take it only for a layout DeckCraft reads (the
+/// fallback is a picture or "this chart isn't available" text). The part is checked later, when
+/// the frame is read, so here only the namespace counts.
+fn chartex_readable(ch: &El) -> bool {
+    let mut found = vec![];
+    ch.find_all("graphicData", &mut found);
+    found.iter().any(|g| g.attr("uri").is_some_and(|u| u.ends_with("/chartex")))
+}
 
 /// Replace every `mc:AlternateContent` by the children of the branch we can read best.
 pub fn resolve_mc(el: &mut El, depth: usize) {
@@ -132,7 +143,8 @@ pub fn resolve_mc(el: &mut El, depth: usize) {
                     let choice = ac.children_named("Choice").find(|ch| {
                         let req_ok = ch.attr("Requires").unwrap_or("").split_whitespace().all(|r| SUPPORTED_MC.contains(&r));
                         // Ink content parts are not modelled; prefer their fallback picture.
-                        let modelled = !ch.elements().any(|e| e.is("contentPart"));
+                        let modelled = !ch.elements().any(|e| e.is("contentPart"))
+                            && (!ch.attr("Requires").unwrap_or("").contains("cx1") || chartex_readable(ch));
                         req_ok && modelled
                     });
                     let branch = choice.or_else(|| ac.child("Fallback"));
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index c4b3f77f..c6226bde 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -368,7 +368,7 @@ fn frame(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El, depth: usize) -> S
         if let Some(c) = gd.child("chart")
             && let Some(rel) = part.rels.get(c.attr("r:id").unwrap_or(""))
             && let Some(bytes) = imp.pkg.get(&rel.target)
-            && let Some(chart) = super::read_chart_xml(bytes)
+            && let Some(chart) = if uri.ends_with("/chartex") { super::read_chartex_xml(bytes) } else { super::read_chart_xml(bytes) }
         {
             s.kind = ShapeKind::Chart(Box::new(chart));
             return s;
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 76567c9e..98ac50cb 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -4,6 +4,9 @@ use deckcraft_model::chart::{Chart, ChartType, Series};
 use deckcraft_model::style::Fill;
 
 use crate::opc::{NS_A, NS_C, NS_R};
+
+/// The Office 2016 chart namespace.
+pub const NS_CX: &str = "http://schemas.microsoft.com/office/drawing/2014/chartex";
 use crate::xml::{A, W};
 
 /// Column letter for a 0-based index (A, B, … Z, AA…).
@@ -362,10 +365,30 @@ fn plot_group(w: &mut W, c: &Chart, kind: ChartType, list: &[(usize, &Series)])
     w.close(tag);
 }
 
+/// The kept `chartEx` part of an Office 2016 chart (waterfall, funnel…) that is unchanged since
+/// it was read, without its workbook link; `None` when it was edited or isn't one.
+pub fn chartex_xml(c: &Chart) -> Option<Vec<u8>> {
+    let raw = c.raw.as_ref()?;
+    let doc = crate::xml::parse(raw.as_bytes()).ok()?;
+    let mut root = doc.root.clone();
+    crate::read::resolve_mc(&mut root, 0);
+    let mut back = crate::read::chartex_from(&root)?;
+    back.raw = c.raw.clone();
+    if &back != c {
+        return None;
+    }
+    let mut keep = doc.root;
+    keep.remove_all(&["externalData"]);
+    let mut w = W::new();
+    w.raw(&keep.to_xml());
+    Some(w.finish())
+}
+
 /// The chart part XML.
 pub fn chart_xml(c: &Chart) -> Vec<u8> {
     // Reuse the kept part when the chart is unchanged since it was read.
     if let Some(raw) = &c.raw
+        && !raw.contains(NS_CX)
         && let Ok(doc) = crate::xml::parse(raw.as_bytes())
         && doc.root.is("chartSpace")
     {
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..48a1141c 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -30,6 +30,8 @@ const CT_PRES_PROPS: &str = "application/vnd.openxmlformats-officedocument.prese
 const CT_VIEW_PROPS: &str = "application/vnd.openxmlformats-officedocument.presentationml.viewProps+xml";
 const CT_TABLE_STYLES: &str = "application/vnd.openxmlformats-officedocument.presentationml.tableStyles+xml";
 const CT_CHART: &str = "application/vnd.openxmlformats-officedocument.drawingml.chart+xml";
+const CT_CHARTEX: &str = "application/vnd.ms-office.chartex+xml";
+const RT_CHARTEX: &str = "http://schemas.microsoft.com/office/2014/relationships/chartEx";
 const CT_COMMENTS: &str = "application/vnd.openxmlformats-officedocument.presentationml.comments+xml";
 const CT_AUTHORS: &str = "application/vnd.openxmlformats-officedocument.presentationml.commentAuthors+xml";
 const CT_CORE: &str = "application/vnd.openxmlformats-package.core-properties+xml";
@@ -43,6 +45,7 @@ pub struct Exp<'a> {
     n_image: u32,
     n_media: u32,
     n_chart: u32,
+    n_chartex: u32,
     pub slide_parts: HashMap<SlideId, String>,
     pub table_styles: Vec<String>,
     placeholder: Option<String>,
@@ -158,6 +161,15 @@ impl Exp<'_> {
         };
         o.rels.add("image", &opc::relative(&o.name, &part), false)
     }
+    /// An unchanged Office 2016 chart's `chartEx` part and its relationship id.
+    pub fn chartex_rel(&mut self, o: &mut Out, c: &deckcraft_model::Chart) -> Option<String> {
+        let xml = chart::chartex_xml(c)?;
+        self.n_chartex += 1;
+        let name = format!("ppt/charts/chartEx{}.xml", self.n_chartex);
+        self.pkg.xml_part(&name, CT_CHARTEX, xml);
+        Some(o.rels.add_new(RT_CHARTEX, &opc::relative(&o.name, &name), false))
+    }
+
     pub fn chart_rel(&mut self, o: &mut Out, c: &deckcraft_model::Chart) -> String {
         self.n_chart += 1;
         let name = format!("ppt/charts/chart{}.xml", self.n_chart);
@@ -385,6 +397,7 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         n_image: 0,
         n_media: 0,
         n_chart: 0,
+        n_chartex: 0,
         slide_parts: HashMap::new(),
         table_styles: vec![],
         placeholder: None,
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..4196f5ea 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -365,12 +365,32 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
         }
         ShapeKind::Chart(c) => {
             let id = cx.id_for(s);
-            let rid = x.chart_rel(o, c);
+            // An unchanged Office 2016 chart goes back as itself, with a plain chart of the same
+            // data for readers without `cx1`, as PowerPoint writes it.
+            let ex = x.chartex_rel(o, c);
+            if let Some(exid) = &ex {
+                w.open("mc:AlternateContent", A::new().a("xmlns:mc", "http://schemas.openxmlformats.org/markup-compatibility/2006"));
+                w.open("mc:Choice", A::new().a("xmlns:cx1", "http://schemas.microsoft.com/office/drawing/2015/9/8/chartex").a("Requires", "cx1"));
+                frame_open(w, x, o, id, s);
+                w.open("a:graphicData", A::new().a("uri", super::chart::NS_CX));
+                w.empty("cx:chart", A::new().a("xmlns:cx", super::chart::NS_CX).a("r:id", exid));
+                w.close("a:graphicData");
+                frame_close(w);
+                w.close("mc:Choice");
+                w.open0("mc:Fallback");
+            }
+            let mut plain = (**c).clone();
+            plain.raw = plain.raw.filter(|r| !r.contains(super::chart::NS_CX));
+            let rid = x.chart_rel(o, &plain);
             frame_open(w, x, o, id, s);
             w.open("a:graphicData", A::new().a("uri", "http://schemas.openxmlformats.org/drawingml/2006/chart"));
             w.empty("c:chart", A::new().a("xmlns:c", crate::opc::NS_C).a("r:id", rid));
             w.close("a:graphicData");
             frame_close(w);
+            if ex.is_some() {
+                w.close("mc:Fallback");
+                w.close("mc:AlternateContent");
+            }
         }
         ShapeKind::Media(m) => {
             let id = cx.id_for(s);
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..58d79b6f 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,120 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+/// A part's bytes, if the package has it.
+fn pkg_part(pkg: &[u8], name: &str) -> Option<Vec<u8>> {
+    use std::io::Read;
+    let mut z = zip::ZipArchive::new(std::io::Cursor::new(pkg)).unwrap();
+    let mut f = z.by_name(name).ok()?;
+    let mut v = vec![];
+    f.read_to_end(&mut v).unwrap();
+    Some(v)
+}
+
+/// Rewrite a package's parts with `edit`, then add `extra` parts.
+fn repack(pkg: &[u8], edit: impl Fn(&str, String) -> String, extra: &[(&str, &[u8])]) -> Vec<u8> {
+    use std::io::{Read, Write};
+    let mut z = zip::ZipArchive::new(std::io::Cursor::new(pkg)).unwrap();
+    let mut out = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+    let opts = zip::write::SimpleFileOptions::default();
+    for i in 0..z.len() {
+        let mut f = z.by_index(i).unwrap();
+        let name = f.name().to_string();
+        let mut data = vec![];
+        f.read_to_end(&mut data).unwrap();
+        if name.ends_with(".xml") || name.ends_with(".rels") {
+            data = edit(&name, String::from_utf8(data).unwrap()).into_bytes();
+        }
+        out.start_file(name, opts).unwrap();
+        out.write_all(&data).unwrap();
+    }
+    for (name, data) in extra {
+        out.start_file(*name, opts).unwrap();
+        out.write_all(data).unwrap();
+    }
+    out.finish().unwrap().into_inner()
+}
+
+const WATERFALL_CX: &str = r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<cx:chartSpace xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:cx="http://schemas.microsoft.com/office/drawing/2014/chartex"><cx:chartData><cx:externalData r:id="rId1" cx:autoUpdate="0"/><cx:data id="0"><cx:strDim type="cat"><cx:f>Sheet1!$A$2:$A$5</cx:f><cx:lvl ptCount="4"><cx:pt idx="0">Start</cx:pt><cx:pt idx="1">Sales</cx:pt><cx:pt idx="2">Costs</cx:pt><cx:pt idx="3">End</cx:pt></cx:lvl></cx:strDim><cx:numDim type="val"><cx:f>Sheet1!$B$2:$B$5</cx:f><cx:lvl ptCount="4" formatCode="General"><cx:pt idx="0">100</cx:pt><cx:pt idx="1">40</cx:pt><cx:pt idx="2">-25</cx:pt><cx:pt idx="3">115</cx:pt></cx:lvl></cx:numDim></cx:data></cx:chartData><cx:chart><cx:title pos="t" align="ctr" overlay="0"><cx:tx><cx:txData><cx:v>Cash flow</cx:v></cx:txData></cx:tx></cx:title><cx:plotArea><cx:plotAreaRegion><cx:series layoutId="waterfall" uniqueId="{1}"><cx:tx><cx:txData><cx:f>Sheet1!$B$1</cx:f><cx:v>Amount</cx:v></cx:txData></cx:tx><cx:dataLabels pos="outEnd"><cx:visibility seriesName="0" categoryName="0" value="1"/></cx:dataLabels><cx:dataId val="0"/><cx:layoutPr><cx:subtotals><cx:idx val="0"/><cx:idx val="3"/></cx:subtotals></cx:layoutPr></cx:series></cx:plotAreaRegion><cx:axis id="0"><cx:catScaling gapWidth="0.5"/><cx:tickLabels/></cx:axis><cx:axis id="1"><cx:valScaling/><cx:majorGridlines/><cx:tickLabels/></cx:axis></cx:plotArea><cx:legend pos="b" align="ctr" overlay="0"/></cx:chart></cx:chartSpace>"#;
+
+/// A waterfall frame as PowerPoint writes it: the chart in a `cx1` choice, a text box fallback.
+const WATERFALL_FRAME: &str = r#"<mc:AlternateContent xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"><mc:Choice xmlns:cx1="http://schemas.microsoft.com/office/drawing/2015/9/8/chartex" Requires="cx1"><p:graphicFrame><p:nvGraphicFramePr><p:cNvPr id="90" name="Waterfall 1"/><p:cNvGraphicFramePr/><p:nvPr/></p:nvGraphicFramePr><p:xfrm><a:off x="914400" y="914400"/><a:ext cx="6096000" cy="4064000"/></p:xfrm><a:graphic><a:graphicData uri="http://schemas.microsoft.com/office/drawing/2014/chartex"><cx:chart xmlns:cx="http://schemas.microsoft.com/office/drawing/2014/chartex" r:id="rIdCx"/></a:graphicData></a:graphic></p:graphicFrame></mc:Choice><mc:Fallback><p:sp><p:nvSpPr><p:cNvPr id="90" name="Waterfall 1"/><p:cNvSpPr><a:spLocks noTextEdit="1"/></p:cNvSpPr><p:nvPr/></p:nvSpPr><p:spPr><a:xfrm><a:off x="914400" y="914400"/><a:ext cx="6096000" cy="4064000"/></a:xfrm><a:prstGeom prst="rect"><a:avLst/></a:prstGeom></p:spPr><p:txBody><a:bodyPr/><a:p><a:r><a:t>This chart isn't available in your version of PowerPoint.</a:t></a:r></a:p></p:txBody></p:sp></mc:Fallback></mc:AlternateContent>"#;
+
+/// Office 2016 charts (`chartEx`): a waterfall reads as a waterfall chart with its data, not as
+/// the "isn't available" fallback text, and an unchanged one is written back as itself with a
+/// plain chart fallback; an edited one is written as a plain chart.
+#[test]
+fn chartex_waterfall_reads_and_round_trips() {
+    use deckcraft_engine::Session;
+    let mut s = Session::with_new();
+    s.execute("slide.new", &serde_json::json!({"layout": "blank"})).unwrap();
+    let base = deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap();
+    let slide = (1..=9).map(|i| format!("ppt/slides/slide{i}.xml")).find(|n| pkg_part(&base, n).is_some()).unwrap();
+    let slide_rels = slide.replace("slides/", "slides/_rels/") + ".rels";
+    let cx_rels = r#"<?xml version="1.0" encoding="UTF-8"?><Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/package" Target="../embeddings/Microsoft_Excel_Worksheet.xlsx"/></Relationships>"#;
+    let pptx = repack(
+        &base,
+        |name, x| {
+            if name == slide {
+                x.replacen("</p:spTree>", &format!("{WATERFALL_FRAME}</p:spTree>"), 1)
+            } else if name == slide_rels {
+                x.replace("</Relationships>", r#"<Relationship Id="rIdCx" Type="http://schemas.microsoft.com/office/2014/relationships/chartEx" Target="../charts/chartEx1.xml"/></Relationships>"#)
+            } else if name == "[Content_Types].xml" {
+                x.replace(
+                    "</Types>",
+                    r#"<Override PartName="/ppt/charts/chartEx1.xml" ContentType="application/vnd.ms-office.chartex+xml"/></Types>"#,
+                )
+            } else {
+                x
+            }
+        },
+        &[("ppt/charts/chartEx1.xml", WATERFALL_CX.as_bytes()), ("ppt/charts/_rels/chartEx1.xml.rels", cx_rels.as_bytes())],
+    );
+    let doc = deckcraft_pptx::import(&pptx).unwrap();
+    let chart = |d: &Presentation| -> Option<Chart> {
+        d.slides.iter().flat_map(|s| s.shapes.iter()).find_map(|sh| match &sh.kind {
+            ShapeKind::Chart(c) => Some((**c).clone()),
+            _ => None,
+        })
+    };
+    let c = chart(&doc).expect("the waterfall is a chart, not the fallback text");
+    assert_eq!(c.kind, ChartType::Waterfall);
+    assert_eq!(c.title.as_deref(), Some("Cash flow"));
+    assert_eq!(c.categories, ["Start", "Sales", "Costs", "End"]);
+    assert_eq!(c.series.len(), 1);
+    assert_eq!(c.series[0].name, "Amount");
+    assert_eq!(c.series[0].values, [Some(100.0), Some(40.0), Some(-25.0), Some(115.0)]);
+    assert!(c.data_labels);
+    assert_eq!(c.legend.as_deref(), Some("b"));
+    let no_fallback_text = doc.slides.iter().flat_map(|s| s.shapes.iter()).all(|sh| !format!("{:?}", sh.kind).contains("isn't available"));
+    assert!(no_fallback_text);
+
+    // Unchanged: chartEx back in a cx1 choice, a plain chart as fallback, no workbook link.
+    let out = deckcraft_pptx::export(&doc).unwrap();
+    let ex = String::from_utf8(pkg_part(&out, "ppt/charts/chartEx1.xml").expect("chartEx part")).unwrap();
+    assert!(ex.contains(r#"layoutId="waterfall""#) && !ex.contains("externalData"), "{ex}");
+    let types = String::from_utf8(pkg_part(&out, "[Content_Types].xml").unwrap()).unwrap();
+    assert!(types.contains("application/vnd.ms-office.chartex+xml"));
+    let sx = String::from_utf8(pkg_part(&out, &slide).unwrap()).unwrap();
+    assert!(sx.contains(r#"Requires="cx1""#) && sx.contains("mc:Fallback") && sx.contains("c:chart "), "{sx}");
+    let srels = String::from_utf8(pkg_part(&out, &slide_rels).unwrap()).unwrap();
+    assert!(srels.contains("relationships/chartEx") && srels.contains("relationships/chart\""), "{srels}");
+    assert!(pkg_part(&out, "ppt/charts/chart1.xml").is_some());
+    let again = deckcraft_pptx::import(&out).unwrap();
+    assert_eq!(chart(&again).map(|c| (c.kind, c.categories, c.series.len())), Some((ChartType::Waterfall, c.categories.clone(), 1)));
+
+    // Edited: the kept part no longer matches, so only a plain chart is written.
+    let mut edited = doc.clone();
+    for sl in &mut edited.slides {
+        for sh in &mut Arc::make_mut(sl).shapes {
+            if let ShapeKind::Chart(ch) = &mut sh.kind {
+                ch.series[0].values[1] = Some(55.0);
+            }
+        }
+    }
+    let out = deckcraft_pptx::export(&edited).unwrap();
+    assert!(pkg_part(&out, "ppt/charts/chartEx1.xml").is_none());
+    assert!(!String::from_utf8(pkg_part(&out, &slide).unwrap()).unwrap().contains("cx1"));
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..a9cdda81 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -145,8 +145,9 @@ Detail in [file-format-parity.md](file-format-parity.md).
 
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
-  chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
-  whisker) aren't read.
+  chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, Pareto,
+  box & whisker) are read for their data and written back unchanged, but they're drawn with the
+  bar renderer and an edited one is saved as a plain column chart; region maps aren't read.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 

From 5c1432b362942ebe40b3e758021bf9ebccdba4fd Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:12:18 +0300
Subject: [PATCH 170/376] PPTX: keep custom XML, the sensitivity label and
 custom properties

Decks from SharePoint and Microsoft 365 carry customXml items (document
library metadata and content types), docMetadata/LabelInfo.xml (the
Microsoft Purview sensitivity label) and docProps/custom.xml. All were
dropped on save, so a labelled corporate deck came back unlabelled. They
are now kept verbatim with their content types, their own relationships
(itemProps) and the root or presentation relationship linking them. Kept
parts never replace a part the writer makes.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/model/src/defaults.rs    |  1 +
 crates/model/src/lib.rs         | 19 +++++++
 crates/pptx/src/opc.rs          |  4 ++
 crates/pptx/src/read/mod.rs     | 70 +++++++++++++++++++++++++
 crates/pptx/src/write/mod.rs    | 28 ++++++++++
 crates/pptx/tests/kept_parts.rs | 91 +++++++++++++++++++++++++++++++++
 docs/file-format-parity.md      |  4 +-
 7 files changed, 216 insertions(+), 1 deletion(-)
 create mode 100644 crates/pptx/tests/kept_parts.rs

diff --git a/crates/model/src/defaults.rs b/crates/model/src/defaults.rs
index 8432ce4a..b2308214 100644
--- a/crates/model/src/defaults.rs
+++ b/crates/model/src/defaults.rs
@@ -513,6 +513,7 @@ pub fn blank_presentation(size: Size, theme: Theme, title_slide: bool) -> Presen
         next_id: next.max(256),
         embedded_fonts: vec![],
         table_styles: vec![],
+        kept_parts: vec![],
         raw_ext: None,
     };
     if title_slide {
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..830d16d1 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -817,6 +817,21 @@ pub struct MediaItem {
     pub link: Option<String>,
 }
 
+/// An XML package part DeckCraft doesn't model, kept as written.
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+#[serde(default, rename_all = "camelCase")]
+pub struct KeptPart {
+    /// Part name from the package root (`customXml/item1.xml`).
+    pub name: String,
+    /// Content type; empty for a relationships part.
+    pub content_type: String,
+    pub xml: String,
+    /// Full relationship type linking it, empty when only its sibling parts point at it.
+    pub rel_type: String,
+    /// Linked from the package root rather than from the presentation part.
+    pub from_root: bool,
+}
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "camelCase")]
 pub struct Presentation {
@@ -843,6 +858,10 @@ pub struct Presentation {
     /// Table styles defined in the file (`ppt/tableStyles.xml`).
     #[serde(skip_serializing_if = "Vec::is_empty")]
     pub table_styles: Vec<table::TableStyleDef>,
+    /// Package parts kept verbatim for round trip: custom XML data (SharePoint metadata), the
+    /// sensitivity label and custom document properties.
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub kept_parts: Vec<KeptPart>,
     /// Unmodelled presentation-level XML kept for round-trip.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw_ext: Option<String>,
diff --git a/crates/pptx/src/opc.rs b/crates/pptx/src/opc.rs
index 4ef21c3d..f10f7a55 100644
--- a/crates/pptx/src/opc.rs
+++ b/crates/pptx/src/opc.rs
@@ -311,6 +311,10 @@ impl PackageOut {
         }
         self.files.push((rels_path(part), rels.to_xml(), true));
     }
+    /// Add a part with no content type of its own (a relationships part).
+    pub fn raw(&mut self, name: &str, data: Vec<u8>) {
+        self.files.push((name.to_string(), data, true));
+    }
     /// Add a binary part; its extension gets a Default content type.
     pub fn binary(&mut self, name: &str, content_type: &str, data: Vec<u8>) {
         let ext = name.rsplit('.').next().unwrap_or("bin").to_ascii_lowercase();
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..86509071 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -119,6 +119,74 @@ pub fn keep_xml(el: &El, ns: &[(String, String)]) -> String {
 /// Namespace prefixes whose `mc:Choice` content we understand.
 const SUPPORTED_MC: [&str; 9] = ["p14", "p15", "p159", "a14", "a16", "p1510", "a15", "c14", "p188"];
 
+/// Relationship types whose parts are kept verbatim, and whether they hang off the package root.
+const KEPT_RELS: [(&str, bool); 3] = [
+    ("http://schemas.openxmlformats.org/officeDocument/2006/relationships/customXml", false),
+    ("http://schemas.microsoft.com/office/2020/02/relationships/classificationlabels", true),
+    ("http://schemas.openxmlformats.org/officeDocument/2006/relationships/custom-properties", true),
+];
+
+/// A part we may keep: outside `ppt/` and the properties the writer makes itself.
+fn keepable(name: &str) -> bool {
+    let n = name.to_ascii_lowercase();
+    !n.is_empty()
+        && !n.contains("..")
+        && !n.starts_with("ppt/")
+        && n != "docprops/core.xml"
+        && n != "docprops/app.xml"
+        && !n.starts_with("[content_types]")
+}
+
+/// Custom XML data, sensitivity labels and custom properties, with the parts they relate to
+/// (`itemProps`) and their relationships parts, as written.
+fn kept_parts(pkg: &Package, pres_path: &str) -> Vec<deckcraft_model::KeptPart> {
+    use deckcraft_model::KeptPart;
+    let mut out: Vec<KeptPart> = Vec::new();
+    let text = |name: &str| pkg.get(name).and_then(|b| std::str::from_utf8(b).ok()).map(str::to_string);
+    for (holder, from_root) in [("", true), (pres_path, false)] {
+        let Some(doc) = pkg.xml(&opc::rels_path(holder)) else { continue };
+        let base = opc::dir_of(holder);
+        for r in doc.root.children_named("Relationship") {
+            let (Some(ty), Some(target)) = (r.attr("Type"), r.attr("Target")) else { continue };
+            if r.attr("TargetMode").is_some_and(|m| m.eq_ignore_ascii_case("external"))
+                || !KEPT_RELS.iter().any(|(t, root)| *t == ty && *root == from_root)
+            {
+                continue;
+            }
+            let name = opc::resolve(&base, target);
+            if !keepable(&name) || out.iter().any(|k| k.name.eq_ignore_ascii_case(&name)) || out.len() >= 400 {
+                continue;
+            }
+            let Some(xml) = text(&name) else { continue };
+            out.push(KeptPart {
+                content_type: pkg.content_type(&name).unwrap_or_default(),
+                name: name.clone(),
+                xml,
+                rel_type: ty.to_string(),
+                from_root,
+            });
+            // The part's own relationships (customXml item → itemProps) and their targets.
+            let rp = opc::rels_path(&name);
+            if let Some(rels_xml) = text(&rp) {
+                for sub in pkg.rels(&name).items.iter().filter(|s| !s.external && keepable(&s.target)) {
+                    if let Some(x) = text(&sub.target)
+                        && !out.iter().any(|k| k.name.eq_ignore_ascii_case(&sub.target))
+                    {
+                        out.push(KeptPart {
+                            content_type: pkg.content_type(&sub.target).unwrap_or_default(),
+                            name: sub.target.clone(),
+                            xml: x,
+                            ..Default::default()
+                        });
+                    }
+                }
+                out.push(KeptPart { name: rp, xml: rels_xml, ..Default::default() });
+            }
+        }
+    }
+    out
+}
+
 /// Replace every `mc:AlternateContent` by the children of the branch we can read best.
 pub fn resolve_mc(el: &mut El, depth: usize) {
     if depth > crate::xml::MAX_DEPTH {
@@ -397,6 +465,8 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
         p.props.company = d.root.child("Company").map(|c| c.text()).unwrap_or_default();
     }
 
+    p.kept_parts = kept_parts(&pkg, &pres_path);
+
     inherit_placeholder_geometry(&mut p);
     p.header_footer = header_footer(&p);
     p.media = std::mem::take(&mut imp.media);
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..f35a97b0 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -516,7 +516,32 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
     x.pkg.xml_part("ppt/tableStyles.xml", CT_TABLE_STYLES, ts);
     let pxml = presentation_xml(&mut x, &mut pres, &master_rids, notes_master_rid.as_deref(), &slide_rids);
     x.pkg.xml_part("ppt/presentation.xml", CT_PRES, pxml);
+    // Kept parts never replace a part the writer makes.
+    let kept: Vec<_> = p
+        .kept_parts
+        .iter()
+        .filter(|k| {
+            let n = k.name.to_ascii_lowercase();
+            !n.is_empty()
+                && !n.contains("..")
+                && !n.starts_with("ppt/")
+                && !n.starts_with("docprops/core")
+                && !n.starts_with("docprops/app")
+                && !n.starts_with("[content_types]")
+                && n != "_rels/.rels"
+        })
+        .collect();
+    for k in kept.iter().filter(|k| !k.rel_type.is_empty() && !k.from_root) {
+        pres.rels.add_new(&k.rel_type, &opc::relative("ppt/presentation.xml", &k.name), false);
+    }
     x.pkg.rels("ppt/presentation.xml", &pres.rels);
+    for k in &kept {
+        if k.content_type.is_empty() {
+            x.pkg.raw(&k.name, k.xml.clone().into_bytes());
+        } else {
+            x.pkg.xml_part(&k.name, &k.content_type, k.xml.clone().into_bytes());
+        }
+    }
 
     // Document properties and package relationships.
     x.pkg.xml_part("docProps/core.xml", CT_CORE, core_xml(p));
@@ -525,6 +550,9 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
     root.add("officeDocument", "ppt/presentation.xml", false);
     root.add(opc::RT_CORE, "docProps/core.xml", false);
     root.add("extended-properties", "docProps/app.xml", false);
+    for k in kept.iter().filter(|k| !k.rel_type.is_empty() && k.from_root) {
+        root.add_new(&k.rel_type, &k.name, false);
+    }
     x.pkg.rels("", &root);
     x.pkg.finish()
 }
diff --git a/crates/pptx/tests/kept_parts.rs b/crates/pptx/tests/kept_parts.rs
new file mode 100644
index 00000000..1f4ecbc3
--- /dev/null
+++ b/crates/pptx/tests/kept_parts.rs
@@ -0,0 +1,91 @@
+//! Custom XML data (SharePoint metadata), the sensitivity label and custom document properties
+//! survive opening and saving a deck.
+
+use std::io::{Cursor, Read, Write};
+
+use deckcraft_engine::Session;
+use zip::write::SimpleFileOptions;
+
+const ITEM: &str = r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?><b:Sources xmlns:b="http://schemas.openxmlformats.org/officeDocument/2006/bibliography"/>"#;
+const PROPS: &str = r#"<?xml version="1.0" encoding="UTF-8" standalone="no"?><ds:datastoreItem ds:itemID="{11111111-2222-3333-4444-555555555555}" xmlns:ds="http://schemas.openxmlformats.org/officeDocument/2006/customXml"><ds:schemaRefs/></ds:datastoreItem>"#;
+const ITEM_RELS: &str = r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?><Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/customXmlProps" Target="itemProps1.xml"/></Relationships>"#;
+const LABEL: &str = r#"<?xml version="1.0" encoding="utf-8" standalone="yes"?><clbl:labelList xmlns:clbl="http://schemas.microsoft.com/office/2020/mipLabelMetadata"><clbl:label id="{aaaaaaaa-0000-0000-0000-000000000001}" enabled="1" method="Standard" siteId="{bbbbbbbb-0000-0000-0000-000000000002}" removed="0"/></clbl:labelList>"#;
+const CUSTOM: &str = r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?><Properties xmlns="http://schemas.openxmlformats.org/officeDocument/2006/custom-properties" xmlns:vt="http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"><property fmtid="{D5CDD505-2E9C-101B-9397-08002B2CF9AE}" pid="2" name="ContentTypeId"><vt:lpwstr>0x0101</vt:lpwstr></property></Properties>"#;
+
+fn deck() -> Vec<u8> {
+    let mut s = Session::new();
+    deckcraft_engine::sample::open_sample(&mut s).expect("sample");
+    let p = s.doc().expect("doc").doc.as_ref().clone();
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut src = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    for i in 0..src.len() {
+        let mut f = src.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        let mut data = Vec::new();
+        f.read_to_end(&mut data).expect("read");
+        let edit = |d: Vec<u8>, at: &str, add: &str| String::from_utf8(d).expect("utf8").replacen(at, &format!("{add}{at}"), 1).into_bytes();
+        let data = match name.as_str() {
+            "[Content_Types].xml" => edit(
+                data,
+                "</Types>",
+                r#"<Override PartName="/customXml/itemProps1.xml" ContentType="application/vnd.openxmlformats-officedocument.customXmlProperties+xml"/><Override PartName="/docProps/custom.xml" ContentType="application/vnd.openxmlformats-officedocument.custom-properties+xml"/><Override PartName="/docMetadata/LabelInfo.xml" ContentType="application/vnd.ms-office.classificationlabels+xml"/>"#,
+            ),
+            "_rels/.rels" => edit(
+                data,
+                "</Relationships>",
+                r#"<Relationship Id="rIdL" Type="http://schemas.microsoft.com/office/2020/02/relationships/classificationlabels" Target="docMetadata/LabelInfo.xml"/><Relationship Id="rIdC" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/custom-properties" Target="docProps/custom.xml"/>"#,
+            ),
+            "ppt/_rels/presentation.xml.rels" => edit(
+                data,
+                "</Relationships>",
+                r#"<Relationship Id="rIdX" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/customXml" Target="../customXml/item1.xml"/>"#,
+            ),
+            _ => data,
+        };
+        out.start_file(name, SimpleFileOptions::default()).expect("start");
+        out.write_all(&data).expect("write");
+    }
+    for (n, d) in [
+        ("customXml/item1.xml", ITEM),
+        ("customXml/itemProps1.xml", PROPS),
+        ("customXml/_rels/item1.xml.rels", ITEM_RELS),
+        ("docMetadata/LabelInfo.xml", LABEL),
+        ("docProps/custom.xml", CUSTOM),
+    ] {
+        out.start_file(n, SimpleFileOptions::default()).expect("start");
+        out.write_all(d.as_bytes()).expect("write");
+    }
+    out.finish().expect("finish").into_inner()
+}
+
+fn read(zip: &mut zip::ZipArchive<Cursor<Vec<u8>>>, name: &str) -> String {
+    let mut s = String::new();
+    zip.by_name(name).unwrap_or_else(|_| panic!("{name} missing")).read_to_string(&mut s).expect("read");
+    s
+}
+
+#[test]
+fn custom_xml_label_and_custom_properties_survive_save() {
+    let p = deckcraft_pptx::import(&deck()).expect("import");
+    assert_eq!(p.kept_parts.len(), 5);
+    let saved = deckcraft_pptx::export(&p).expect("export");
+    let mut zip = zip::ZipArchive::new(Cursor::new(saved.clone())).expect("zip");
+    for (n, d) in [
+        ("customXml/item1.xml", ITEM),
+        ("customXml/itemProps1.xml", PROPS),
+        ("customXml/_rels/item1.xml.rels", ITEM_RELS),
+        ("docMetadata/LabelInfo.xml", LABEL),
+        ("docProps/custom.xml", CUSTOM),
+    ] {
+        assert_eq!(read(&mut zip, n), d, "{n}");
+    }
+    let ct = read(&mut zip, "[Content_Types].xml");
+    assert!(ct.contains("/docMetadata/LabelInfo.xml") && ct.contains("customXmlProperties+xml") && ct.contains("custom-properties+xml"));
+    let root = read(&mut zip, "_rels/.rels");
+    assert!(root.contains("classificationlabels") && root.contains(r#"Target="docProps/custom.xml""#));
+    assert!(read(&mut zip, "ppt/_rels/presentation.xml.rels").contains(r#"Target="../customXml/item1.xml""#));
+    // And again: a second save keeps them once.
+    let again = deckcraft_pptx::import(&saved).expect("reimport");
+    assert_eq!(again.kept_parts, p.kept_parts);
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..e0ff308a 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -83,7 +83,8 @@ the round trip even though DeckCraft doesn't model it.
 | Comments: legacy | yes | yes | |
 | Comments: modern threaded (`p188`) | yes | no (written as legacy) | Replies and resolved state lost (#70) |
 | Unknown slide-level elements (`graphicFrame` OLE, extensions, `mc:AlternateContent`) | kept | kept | Rendered as a labelled placeholder with the preview picture when present |
-| Tags, custom XML, VBA | no / no / no | | |
+| Custom XML data, sensitivity label (`docMetadata/LabelInfo.xml`), custom document properties | kept verbatim | yes | SharePoint metadata and the label survive a save; `custom_xml_label_and_custom_properties_survive_save` |
+| Tags, VBA | no / no | | |
 | Embedded fonts | no | no | |
 | Encryption (password to open) | no | no | |
 
@@ -99,6 +100,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Custom XML parts, the sensitivity label and custom properties kept on save |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |

From 37559f793cc3075f366b760e8d1f9eb0dae6e25d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:14:52 +0300
Subject: [PATCH 171/376] UI: Grid Options sets spacing, snap and the on-screen
 grid
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

View › Grid Options sets the grid spacing, snap to grid, snap to
other objects, and whether gridlines and guides are drawn. The
canvas grid follows that spacing.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                    |   4 +-
 crates/ui-egui/src/canvas.rs  |  69 ++++++++++++++----
 crates/ui-egui/src/dialogs.rs |  39 ++++++++++
 crates/ui-egui/src/lib.rs     | 129 ++++++++++++++++++++++++++++++++++
 crates/ui-egui/src/menus.rs   |   1 +
 crates/ui-egui/src/ribbon.rs  |   3 +
 docs/gaps.md                  |   5 +-
 docs/roadmap.md               |   5 +-
 docs/target-app-parity.md     |   5 +-
 docs/ui-parity.md             |  11 +--
 10 files changed, 247 insertions(+), 24 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..7d8fc2db 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options dialog; previous: hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Grid Options: spacing, snap to grid, snap to other objects, and whether gridlines and guides are drawn; the on-screen grid uses that spacing |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: Grid Options dialog |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..4b37c2f5 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -135,18 +135,10 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     }
     app.perf.render_ms = app.textures.last_render_ms;
     media_frames(app, &painter, xf);
-    if app.ui.gridlines {
-        let step = 72.0 / 2.0 * scale;
-        let mut x = slide_rect.min.x + step;
-        while x < slide_rect.max.x {
-            painter.line_segment([pos2(x, slide_rect.min.y), pos2(x, slide_rect.max.y)], Stroke::new(0.5, Color32::from_black_alpha(40)));
-            x += step;
-        }
-        let mut y = slide_rect.min.y + step;
-        while y < slide_rect.max.y {
-            painter.line_segment([pos2(slide_rect.min.x, y), pos2(slide_rect.max.x, y)], Stroke::new(0.5, Color32::from_black_alpha(40)));
-            y += step;
-        }
+    if app.ui.gridlines
+        && let Some(step) = grid_line_step(app.session.prefs.grid_spacing, scale)
+    {
+        draw_grid(&painter, slide_rect, step);
     }
     if app.ui.guides {
         let c = slide_rect.center();
@@ -697,3 +689,56 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
         }
     });
 }
+
+/// Screen-point distance between grid lines. `spacing` is the grid spacing in slide points;
+/// `scale` maps slide points onto the screen. `None` when the grid would not be a finite set of
+/// lines (bad inputs, or so fine that a line would land on every pixel).
+fn grid_line_step(spacing: f64, scale: f32) -> Option<f32> {
+    if !spacing.is_finite() || !(1.0..=288.0).contains(&spacing) || !scale.is_finite() || scale <= 0.0 {
+        return None;
+    }
+    let step = (spacing as f32) * scale;
+    if !step.is_finite() || step < 1.0 {
+        return None;
+    }
+    Some(step)
+}
+
+fn draw_grid(painter: &egui::Painter, slide: Rect, step: f32) {
+    let stroke = Stroke::new(0.5, Color32::from_black_alpha(40));
+    // A denser grid than this paints a grey slab and costs a frame. Skip it.
+    if !grid_fits(slide.width(), step) || !grid_fits(slide.height(), step) {
+        return;
+    }
+    let mut x = slide.min.x + step;
+    while x < slide.max.x {
+        painter.line_segment([pos2(x, slide.min.y), pos2(x, slide.max.y)], stroke);
+        x += step;
+    }
+    let mut y = slide.min.y + step;
+    while y < slide.max.y {
+        painter.line_segment([pos2(slide.min.x, y), pos2(slide.max.x, y)], stroke);
+        y += step;
+    }
+}
+
+fn grid_fits(span: f32, step: f32) -> bool {
+    span.is_finite() && span > 0.0 && step >= 1.0 && span / step <= 800.0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::grid_line_step;
+
+    #[test]
+    fn grid_step_follows_spacing_and_rejects_unusable_values() {
+        let step = grid_line_step(72.0, 0.5).unwrap_or(0.0);
+        assert!((step - 36.0).abs() < 1e-3, "{step}");
+        assert!(grid_line_step(6.0, 1.0).is_some());
+        assert!(grid_line_step(0.0, 1.0).is_none());
+        assert!(grid_line_step(f64::NAN, 1.0).is_none());
+        assert!(grid_line_step(1_000.0, 1.0).is_none());
+        assert!(grid_line_step(6.0, 0.0).is_none());
+        assert!(grid_line_step(6.0, 0.1).is_none(), "a 6 pt grid at 10% zoom is finer than one screen point");
+    }
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..845ca485 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -45,6 +45,7 @@ fn title(id: &str) -> &'static str {
         "paragraph" => "Paragraph",
         "about" => "About DeckCraft",
         "preferences" => "Preferences",
+        "gridOptions" => "Grid Options",
         "export" => "Export",
         "symbol" => "Symbol",
         "equation" => "Equation",
@@ -708,6 +709,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             let (ok, _) = buttons(ui, "Close");
             ok
         }
+        "gridOptions" => grid_options(app, ui, d),
         "preferences" => {
             ui.label(egui::RichText::new("General").font(theme::bold(13.0)));
             let mut dark = app.ui.brightness == theme::Brightness::Dark;
@@ -738,6 +740,43 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     }
 }
 
+fn format_spacing(v: f64) -> String {
+    if !v.is_finite() {
+        return "6".into();
+    }
+    if (v - v.round()).abs() < 1e-6 && v.abs() < 1.0e6 { format!("{}", v.round() as i64) } else { format!("{v:.2}") }
+}
+
+/// Grid Options: spacing, snap and whether the grid and guides are drawn. OK applies one
+/// `view.gridOptions` call; Cancel leaves the presentation as it was.
+fn grid_options(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    ui.label(egui::RichText::new("Snap").font(theme::bold(13.0)));
+    let snap = check(ui, d, "Snap objects to grid", "snap", app.session.prefs.snap_to_grid);
+    let smart = check(ui, d, "Snap objects to other objects", "smart", app.session.prefs.smart_guides);
+    let spacing_default = format_spacing(app.session.prefs.grid_spacing);
+    field(ui, d, "Spacing (pt):", "spacing", &spacing_default);
+    ui.add_space(6.0);
+    ui.label(egui::RichText::new("Display").font(theme::bold(13.0)));
+    let gridlines = check(ui, d, "Display grid on screen", "gridlines", app.ui.gridlines);
+    let guides = check(ui, d, "Display drawing guides on screen", "guides", app.ui.guides);
+    if let Some(err) = d.fields.get("error").cloned().filter(|s| !s.is_empty()) {
+        ui.add_space(4.0);
+        ui.label(egui::RichText::new(err).color(Color32::from_rgb(0xB0, 0x30, 0x30)));
+    }
+    let (ok, cancel) = buttons(ui, "OK");
+    if ok {
+        let spacing = num(d, "spacing", app.session.prefs.grid_spacing);
+        match app.run("view.gridOptions", json!({"spacing": spacing, "snap": snap, "smartGuides": smart, "gridlines": gridlines, "guides": guides})) {
+            Ok(_) => return true,
+            Err(e) => {
+                d.fields.insert("error".into(), e);
+                return false;
+            }
+        }
+    }
+    cancel
+}
+
 fn pretty_equation(s: &str) -> String {
     let sup = |c: char| match c {
         '0' => '⁰',
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..4de17d60 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -142,6 +142,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("view.ruler", "Ruler", None, "{on?: bool}"),
     ("view.gridlines", "Gridlines", Some("Shift+F9"), "{on?: bool}"),
     ("view.guides", "Guides", Some("Alt+F9"), "{on?: bool}"),
+    ("view.gridOptions", "Grid Options…", None, "{spacing?: pt, snap?: bool, smartGuides?: bool, gridlines?: bool, guides?: bool}"),
     ("view.zoomIn", "Zoom In", Some("Cmd+="), "{}"),
     ("view.zoomOut", "Zoom Out", Some("Cmd+-"), "{}"),
     ("view.zoom", "Zoom…", None, "{percent}"),
@@ -229,6 +230,18 @@ pub struct SlideApp {
     pub selpane: selpane::State,
 }
 
+fn grid_options_touched(p: &Value) -> bool {
+    ["spacing", "snap", "smartGuides", "gridlines", "guides"].iter().any(|k| p.get(*k).is_some())
+}
+
+fn grid_flag(p: &Value, key: &str) -> Result<Option<bool>, String> {
+    match p.get(key) {
+        None => Ok(None),
+        Some(Value::Bool(b)) => Ok(Some(*b)),
+        Some(_) => Err(format!("`{key}` must be true or false")),
+    }
+}
+
 impl SlideApp {
     pub fn new(session: Session, mut services: Services) -> Self {
         let audio_out = services.audio_out.take();
@@ -458,6 +471,49 @@ impl SlideApp {
             "view.ruler" => self.ui.ruler = self.flag(p, self.ui.ruler),
             "view.gridlines" => self.ui.gridlines = self.flag(p, self.ui.gridlines),
             "view.guides" => self.ui.guides = self.flag(p, self.ui.guides),
+            "view.gridOptions" => {
+                if grid_options_touched(p) {
+                    let spacing = match p.get("spacing") {
+                        None => None,
+                        Some(raw) => {
+                            let n = raw.as_f64().filter(|v| v.is_finite()).ok_or("`spacing` must be a finite number of points")?;
+                            if !(1.0..=288.0).contains(&n) {
+                                return Err("`spacing` must be from 1 to 288 points".into());
+                            }
+                            Some(n)
+                        }
+                    };
+                    let snap = grid_flag(p, "snap")?;
+                    let smart = grid_flag(p, "smartGuides")?;
+                    let gridlines = grid_flag(p, "gridlines")?;
+                    let guides = grid_flag(p, "guides")?;
+                    if let Some(n) = spacing {
+                        self.session.prefs.grid_spacing = n;
+                    }
+                    if let Some(b) = snap {
+                        self.session.prefs.snap_to_grid = b;
+                    }
+                    if let Some(b) = smart {
+                        self.session.prefs.smart_guides = b;
+                        self.ui.smart_guides = b;
+                    }
+                    if let Some(b) = gridlines {
+                        self.ui.gridlines = b;
+                    }
+                    if let Some(b) = guides {
+                        self.ui.guides = b;
+                    }
+                } else {
+                    self.dialog = Some(dialogs::Dialog::new("gridOptions"));
+                }
+                return Ok(json!({
+                    "spacing": self.session.prefs.grid_spacing,
+                    "snap": self.session.prefs.snap_to_grid,
+                    "smartGuides": self.session.prefs.smart_guides,
+                    "gridlines": self.ui.gridlines,
+                    "guides": self.ui.guides,
+                }));
+            }
             "view.zoomIn" | "view.zoomOut" => {
                 let cur = self.ui.zoom.unwrap_or(self.canvas_scale);
                 let steps = [0.1, 0.25, 0.33, 0.5, 0.66, 0.75, 1.0, 1.25, 1.5, 2.0, 3.0, 4.0];
@@ -1305,6 +1361,79 @@ mod tests {
         app.run("app.home", json!({})).unwrap();
         assert!(!app.backstage_open(), "with nothing open the start screen shows anyway");
     }
+
+    #[test]
+    fn grid_options_sets_spacing_and_display_or_opens_the_dialog() {
+        let mut app = SlideApp::new(Session::with_new(), Services::default());
+        assert!((app.session.prefs.grid_spacing - 6.0).abs() < 1e-9);
+        let v =
+            app.run("view.gridOptions", json!({"spacing": 72.0, "snap": false, "smartGuides": false, "gridlines": true, "guides": true})).unwrap();
+        assert_eq!(v["spacing"], 72.0);
+        assert_eq!(v["snap"], false);
+        assert_eq!(v["smartGuides"], false);
+        assert_eq!(v["gridlines"], true);
+        assert_eq!(v["guides"], true);
+        assert!(app.dialog.is_none());
+        assert!(app.ui.gridlines && app.ui.guides);
+        assert!(!app.session.prefs.snap_to_grid && !app.ui.smart_guides);
+
+        app.run("view.gridOptions", json!({"snap": true})).unwrap();
+        assert!(app.session.prefs.snap_to_grid);
+        assert!((app.session.prefs.grid_spacing - 72.0).abs() < 1e-9);
+        assert!(app.dialog.is_none());
+
+        for bad in [json!({"spacing": 0}), json!({"spacing": 289}), json!({"spacing": "72"}), json!({"spacing": null}), json!({"snap": 1})] {
+            assert!(app.run("view.gridOptions", bad).is_err(), "rejected a bad grid option");
+        }
+        assert!((app.session.prefs.grid_spacing - 72.0).abs() < 1e-9);
+        assert!(app.session.prefs.snap_to_grid);
+
+        app.run("view.gridOptions", json!({})).unwrap();
+        assert_eq!(app.dialog.as_ref().map(|d| d.id.as_str()), Some("gridOptions"));
+        assert!((app.session.prefs.grid_spacing - 72.0).abs() < 1e-9);
+    }
+
+    #[test]
+    fn grid_options_dialog_lists_spacing_and_display() {
+        use egui_kittest::kittest::Queryable;
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        harness.state_mut().run("view.gridOptions", json!({})).unwrap();
+        harness.run_steps(2);
+        assert!(harness.query_by_label_contains("Display grid on screen").is_some());
+        assert!(harness.query_by_label_contains("Snap objects to grid").is_some());
+        assert!(harness.query_by_label_contains("Spacing").is_some());
+        let show_grid = harness
+            .query_all_by_role_and_label(egui::accesskit::Role::CheckBox, "Display grid on screen")
+            .next()
+            .unwrap_or_else(|| panic!("no grid checkbox"));
+        show_grid.click_accesskit();
+        harness.run_steps(2);
+        harness.query_all_by_role_and_label(egui::accesskit::Role::Button, "OK").next().unwrap_or_else(|| panic!("no OK button")).click_accesskit();
+        harness.run_steps(2);
+        assert!(harness.state().dialog.is_none(), "OK closes Grid Options");
+        assert!(harness.state().ui.gridlines, "OK applies the grid checkbox");
+        assert!((harness.state().session.prefs.grid_spacing - 6.0).abs() < 1e-9);
+
+        harness.state_mut().run("view.gridOptions", json!({})).unwrap();
+        harness.run_steps(2);
+        harness
+            .query_all_by_role_and_label(egui::accesskit::Role::Button, "Cancel")
+            .next()
+            .unwrap_or_else(|| panic!("no Cancel button"))
+            .click_accesskit();
+        harness.run_steps(2);
+        assert!(harness.state().dialog.is_none(), "Cancel closes Grid Options");
+        assert!(harness.state().ui.gridlines, "Cancel leaves the grid on");
+        assert!((harness.state().session.prefs.grid_spacing - 6.0).abs() < 1e-9);
+    }
+
     fn canvas_harness() -> egui_kittest::Harness<'static, SlideApp> {
         let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
             |ui, app: &mut SlideApp| {
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..ba9dfb38 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -194,6 +194,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Ruler", "view.ruler"),
                 ("Gridlines", "view.gridlines"),
                 ("Guides", "view.guides"),
+                ("Grid Options…", "view.gridOptions"),
                 ("-", ""),
                 ("Zoom In", "view.zoomIn"),
                 ("Zoom Out", "view.zoomOut"),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..722a3d05 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1842,6 +1842,9 @@ fn view(app: &mut SlideApp, ui: &mut Ui) {
                 app.ui.guides = gd;
             }
         });
+        if big_button(ui, Icon::Gridlines, "Grid\nOptions", true).clicked() {
+            let _ = app.run("view.gridOptions", json!({}));
+        }
         let n = app.ui.notes;
         if big_button_ex(ui, Icon::Notes, "Notes", true, false, n).0.clicked() {
             app.ui.notes = !n;
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..4c68b1af 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options dialog; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,7 +203,7 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
   Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Grid Options dialog sets spacing, snap and whether gridlines and guides show; the on-screen grid follows that spacing |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..11bfc0aa 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options; previous: core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -80,7 +80,7 @@ From the local execution plan (`plan/execution-plan.md`, gitignored). Status as
 | M7 | Slide show | mostly | second-display placement, laser, record |
 | M8 | Tables and charts | partly | chart data grid, elements, chartex types, draw table |
 | M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), text warps |
-| M10 | Views | done | grid options, New Window |
+| M10 | Views | done | New Window |
 | M11 | Output | partly | vector PDF, SVG, GIF, MP4, print |
 | M12 | Review | partly | dictionaries, AutoCorrect, find/replace dialog, compare |
 | M13 | Automation and CLI parity | done | |
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | M10: Grid Options dialog; New Window stays open |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..cf565002 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Views: Grid Options landed; New Window remains; previous: hours to ~95% per audience added; ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -182,7 +182,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Application shell | 5 | 71% | ~55% | 8–14 | No native macOS menu bar, thin start screen (templates, recent), one window per presentation missing | [ui-parity.md](ui-parity.md) |
 | Files (commands) | 4 | 69% | ~50% | see file formats | Print, reuse slides, passwords, legacy and macro formats | [file-format-parity.md](file-format-parity.md) |
 | Slides and sections | 6 | 90% | ~85% | 3–5 | Zoom (summary/section/slide), copying slides between decks keeps formatting only partly | [parity-checklist.md](parity-checklist.md) |
-| Views | 4 | 90% | ~80% | 3–6 | Snap to grid and grid options, New Window | [ui-parity.md](ui-parity.md) |
+| Views | 4 | 90% | ~80% | 3–5 | New Window | [ui-parity.md](ui-parity.md) |
 | Masters and themes | 7 | 85% | ~70% | 8–14 | Notes and Handout masters, theme variants, `.thmx`, effect schemes | [parity-checklist.md](parity-checklist.md) |
 | Shapes | 7 | 86% | ~75% | 8–14 | Edit points, text warp, WordArt depth | [ui-parity.md](ui-parity.md) |
 | Format (fill, line, effects) | 6 | 81% | ~65% | 8–14 | Format Shape pane depth, bevel and 3-D, picture/texture fill options | [ui-parity.md](ui-parity.md) |
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Views: Grid Options dialog landed (spacing, snap, display). Remaining in that row: New Window. Percentages unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..af76d104 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options dialog; previous: File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Grid Options, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -74,7 +74,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Marquee, Shift/Cmd multi-select, Tab to cycle | yes | yes |
 | Objects off the slide: drawn on the area around it in Normal view (full strength, master graphics too), selectable and movable there; clipped in the show, exports and thumbnails | yes | yes (#270) |
 | Smart guides (edges, centres, equal spacing) | yes | yes |
-| Snap to grid, grid options, drawing guides | yes | gridlines, guides and snap to grid (engine setting); no Grid Options dialog or menu toggle |
+| Snap to grid, grid options, drawing guides | yes | Grid Options (`view.gridOptions`): spacing, snap to grid, snap to other objects, display grid and guides; the on-screen grid uses that spacing |
 | Nudge (arrows), fine nudge (Option+arrows) | yes | yes |
 | Shift-constrained move, Option-drag to duplicate | yes | yes |
 | Connector glue and rerouting | yes | yes |
@@ -139,15 +139,16 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 | Format Shape pane depth | 6–10 |
 | Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
 | Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
-| Grid Options, edit points UI, crop depth | 4–7 |
+| Edit points UI, crop depth | 3–6 |
 | Multiple windows | 3–5 |
 | A screenshot comparison pass on the most-used tabs | 2–4 |
-| **Total** | **~30–52** |
+| **Total** | **~29–51** |
 
 ## Revision history
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Grid Options dialog: spacing, snap, and whether gridlines and guides are drawn; the on-screen grid uses that spacing |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 0d47da07e5d07f01827a2efc9355060c7e3c3e57 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:16:23 +0300
Subject: [PATCH 172/376] Charts: draw waterfall, funnel, treemap and sunburst
 layouts

These Office 2016 charts were drawn as plain columns. Now:
- waterfall: bars float from the running total, total points
  (cx:subtotals, now read into Chart.subtotals) stand on the axis and
  reset it, increases/decreases/totals take accents 1-3 with a matching
  legend, and connectors join each bar to the next;
- funnel: centred bars as wide as their value, category labels on the
  left and values inside;
- treemap: squarified tiles in proportion to their value, labelled;
- sunburst: the innermost level as a ring with an open centre.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/model/src/chart.rs       |  34 +++++
 crates/pptx/src/read/chartex.rs |   3 +
 crates/render/src/chart.rs      |  56 +++++++-
 crates/render/src/chartex.rs    | 227 ++++++++++++++++++++++++++++++++
 crates/render/src/lib.rs        |   1 +
 crates/render/src/tests.rs      |  35 +++++
 docs/gaps.md                    |   6 +-
 7 files changed, 356 insertions(+), 6 deletions(-)
 create mode 100644 crates/render/src/chartex.rs

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index aebee497..a6c9fa24 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -186,6 +186,10 @@ pub struct Chart {
     pub y2_hidden: bool,
     /// The chart's language (`c:lang`, e.g. `ru-RU`): digit grouping and decimal mark.
     pub lang: Option<String>,
+    /// A waterfall's total points (`cx:subtotals`): bars that stand on the axis and restart
+    /// the running total, instead of floating.
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub subtotals: Vec<usize>,
     /// Original chart XML part kept for round-trip of unmodelled options.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw: Option<String>,
@@ -225,6 +229,7 @@ impl Default for Chart {
             y2_format: None,
             y2_hidden: false,
             lang: None,
+            subtotals: vec![],
             raw: None,
         }
     }
@@ -304,6 +309,28 @@ impl Chart {
     /// A value axis' scale — (min, max, major unit) — with at most `max_intervals` intervals:
     /// the bounds and unit the chart fixes, else PowerPoint's automatic ones (the data plus 5 %
     /// headroom, rounded out to a 1-2-5 unit). `None` when no series uses the axis.
+    /// A waterfall's bars as (from, to) on the value axis: each point floats from the running
+    /// total, a total point stands on zero and sets it.
+    pub fn waterfall_bars(&self) -> Vec<(f64, f64)> {
+        let Some(s) = self.series.first() else { return vec![] };
+        let mut run = 0.0;
+        s.values
+            .iter()
+            .enumerate()
+            .map(|(i, v)| {
+                let v = v.unwrap_or(0.0);
+                if self.subtotals.contains(&i) {
+                    run = v;
+                    (0.0, v)
+                } else {
+                    let from = run;
+                    run += v;
+                    (from, run)
+                }
+            })
+            .collect()
+    }
+
     pub fn axis_scale(&self, secondary: bool, max_intervals: usize) -> Option<(f64, f64, f64)> {
         let (lo, hi) = self.axis_range(secondary)?;
         let (fmin, fmax, major) = if secondary { (self.y2_min, self.y2_max, self.y2_major) } else { (self.y_min, self.y_max, self.y_major) };
@@ -328,6 +355,13 @@ impl Chart {
     pub fn value_range(&self) -> (f64, f64) {
         let mut lo: f64 = 0.0;
         let mut hi: f64 = 0.0;
+        if self.kind == ChartType::Waterfall {
+            for (a, b) in self.waterfall_bars() {
+                lo = lo.min(a.min(b));
+                hi = hi.max(a.max(b));
+            }
+            return (lo, hi);
+        }
         let n = self.categories.len().max(self.series.iter().map(|s| s.values.len()).max().unwrap_or(0));
         if self.kind.stacked() {
             for i in 0..n {
diff --git a/crates/pptx/src/read/chartex.rs b/crates/pptx/src/read/chartex.rs
index ac14c97b..1207df02 100644
--- a/crates/pptx/src/read/chartex.rs
+++ b/crates/pptx/src/read/chartex.rs
@@ -110,6 +110,9 @@ pub(crate) fn chartex_from(root: &El) -> Option<Chart> {
         if c.categories.is_empty() {
             c.categories = d.categories.clone();
         }
+        if let Some(st) = s.child("layoutPr").and_then(|l| l.child("subtotals")) {
+            c.subtotals = st.children_named("idx").filter_map(|i| i.u32("val")).map(|i| i as usize).take(MAX_POINTS).collect();
+        }
         let name = s.child("tx").and_then(|t| t.find("v")).map(|v| v.text()).unwrap_or_default();
         c.series.push(Series {
             name,
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..5df5dd7e 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -59,7 +59,18 @@ fn split_label(name: &str) -> String {
     }
 }
 
-fn label(ctx: &mut RenderContext, rctx: &Ctx, m: Affine, text: &str, r: Rect, size: f64, align: Align, anchor: Anchor, col: Rgba, bold: bool) {
+pub(crate) fn label(
+    ctx: &mut RenderContext,
+    rctx: &Ctx,
+    m: Affine,
+    text: &str,
+    r: Rect,
+    size: f64,
+    align: Align,
+    anchor: Anchor,
+    col: Rgba,
+    bold: bool,
+) {
     let mut body = TextBody::from_text(text);
     body.body.inset_l = Some(0.0);
     body.body.inset_r = Some(0.0);
@@ -150,7 +161,14 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     }
     let pie = matches!(c.kind, ChartType::Pie | ChartType::Doughnut);
     // Legend placed by `c:legendPos`.
-    let legend_items: Vec<(String, Rgba)> = if pie {
+    let waterfall = c.kind == ChartType::Waterfall;
+    let legend_items: Vec<(String, Rgba)> = if waterfall {
+        ["Increase", "Decrease", "Total"].iter().enumerate().map(|(i, n)| (n.to_string(), series_color(rctx, c, i))).collect()
+    } else if matches!(c.kind, ChartType::Treemap | ChartType::Sunburst) {
+        c.categories.iter().enumerate().map(|(i, n)| (n.clone(), series_color(rctx, c, i))).collect()
+    } else if c.kind == ChartType::Funnel {
+        vec![]
+    } else if pie {
         c.categories.iter().enumerate().map(|(i, n)| (n.clone(), series_color(rctx, c, i))).collect()
     } else {
         c.series
@@ -242,6 +260,10 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         }
         return;
     }
+    if matches!(c.kind, ChartType::Funnel | ChartType::Treemap | ChartType::Sunburst) {
+        crate::chartex::draw(ctx, rctx, c, m, area, base, text_col);
+        return;
+    }
     let combo = c.kind == ChartType::Combo;
     // Bars are drawn first and lines over them; a combo chart has both.
     let bar_kind = c.series.iter().map(|s| c.series_kind(s)).find(|k| k.is_bar_like());
@@ -399,7 +421,9 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                 let sec = c.on_secondary(s);
                 let v = s.values.get(i).copied().flatten().unwrap_or(0.0) / total;
                 let start = band * i as f64 + (band - group) / 2.0 + if stacked { 0.0 } else { bar * bi as f64 };
-                let (a, b) = if stacked {
+                let (a, b) = if waterfall {
+                    c.waterfall_bars().get(i).copied().unwrap_or_default()
+                } else if stacked {
                     if v >= 0.0 {
                         let r = (pos_acc, pos_acc + v);
                         pos_acc += v;
@@ -416,10 +440,34 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                     Rect::new(to_v(a), plot.y0 + start, to_v(b), plot.y0 + start + bar)
                 } else {
                     Rect::new(plot.x0 + start, to_axis(sec, b), plot.x0 + start + bar, to_axis(sec, a))
+                }
+                .abs();
+                // A waterfall colours increases, decreases and totals, and joins each bar's end
+                // to the next bar's start.
+                let fill = if waterfall {
+                    let slot = if c.subtotals.contains(&i) {
+                        2
+                    } else if b < a {
+                        1
+                    } else {
+                        0
+                    };
+                    series_color(rctx, c, slot)
+                } else {
+                    series_fill(rctx, c, *si, Some(s))
                 };
                 ctx.set_transform(m);
-                ctx.set_paint(color(series_fill(rctx, c, *si, Some(s)), 1.0));
+                ctx.set_paint(color(fill, 1.0));
                 ctx.fill_rect(&r.abs());
+                if waterfall && i + 1 < ncat && !horiz {
+                    let y = to_v(b);
+                    let mut j = BezPath::new();
+                    j.move_to((r.x1, y));
+                    j.line_to((r.x1 + (band - bar), y));
+                    ctx.set_paint(color(Rgba::rgb(0xA6, 0xA6, 0xA6), 1.0));
+                    ctx.set_stroke(kurbo::Stroke::new(0.75));
+                    ctx.stroke_path(&j);
+                }
                 if c.data_labels {
                     let t = c.data_label(s, s.values.get(i).copied().flatten().unwrap_or(0.0));
                     let lr = if horiz {
diff --git a/crates/render/src/chartex.rs b/crates/render/src/chartex.rs
new file mode 100644
index 00000000..faf8ec2e
--- /dev/null
+++ b/crates/render/src/chartex.rs
@@ -0,0 +1,227 @@
+//! Office 2016 chart layouts the bar renderer can't draw: funnel, treemap and sunburst
+//! (waterfall bars are drawn by [`crate::chart`]).
+
+use deckcraft_color::Rgba;
+use deckcraft_model::chart::{Chart, ChartType};
+use deckcraft_model::resolve::Ctx;
+use deckcraft_model::text::{Align, Anchor};
+use kurbo::{Affine, BezPath, Point, Rect, Shape as _};
+use vello_cpu::RenderContext;
+
+use crate::chart::{label, series_color};
+use crate::color;
+
+/// Draw `c` inside `area` (the space left by the title and legend).
+pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rect, base: f64, text_col: Rgba) {
+    let Some(s) = c.series.first() else { return };
+    let vals: Vec<f64> = s.values.iter().map(|v| v.unwrap_or(0.0).max(0.0)).collect();
+    if vals.iter().all(|v| *v <= 0.0) {
+        return;
+    }
+    let value_label = |v: f64| c.data_label(s, v);
+    let labels = c.data_labels || c.kind == ChartType::Funnel;
+    match c.kind {
+        ChartType::Funnel => funnel(ctx, rctx, c, m, area, base, text_col, &vals, &value_label),
+        ChartType::Treemap => treemap(ctx, rctx, c, m, area, base, &vals, labels.then_some(&value_label)),
+        _ => sunburst(ctx, rctx, c, m, area, base, &vals),
+    }
+}
+
+/// Bars centred on one axis, as wide as their value, widest first as given: category labels on
+/// the left, values inside.
+#[allow(clippy::too_many_arguments)]
+fn funnel(
+    ctx: &mut RenderContext,
+    rctx: &Ctx,
+    c: &Chart,
+    m: Affine,
+    area: Rect,
+    base: f64,
+    text_col: Rgba,
+    vals: &[f64],
+    value_label: &dyn Fn(f64) -> String,
+) {
+    let n = vals.len().max(1);
+    let gutter = c.categories.iter().map(|n| n.chars().count()).max().unwrap_or(0) as f64 * base * 0.55 + base;
+    let plot = Rect::new(area.x0 + gutter.min(area.width() * 0.4), area.y0, area.x1, area.y1);
+    let max = vals.iter().copied().fold(0.0, f64::max).max(1e-9);
+    let band = plot.height() / n as f64;
+    let cx = plot.center().x;
+    for (i, v) in vals.iter().enumerate() {
+        let w = v / max * plot.width();
+        let y = plot.y0 + band * i as f64;
+        let r = Rect::new(cx - w / 2.0, y + band * 0.05, cx + w / 2.0, y + band * 0.95);
+        ctx.set_transform(m);
+        ctx.set_paint(color(series_color(rctx, c, 0), 1.0));
+        ctx.fill_rect(&r);
+        if let Some(name) = c.categories.get(i) {
+            label(ctx, rctx, m, name, Rect::new(area.x0, y, plot.x0 - base * 0.4, y + band), base, Align::Right, Anchor::Middle, text_col, false);
+        }
+        label(ctx, rctx, m, &value_label(*v), Rect::new(cx - 60.0, y, cx + 60.0, y + band), base, Align::Center, Anchor::Middle, Rgba::WHITE, false);
+    }
+}
+
+/// Squarified treemap (Bruls, Huizing, van Wijk): rows of tiles laid along the short side,
+/// each row kept while it improves the worst aspect ratio.
+pub fn squarify(vals: &[f64], r: Rect) -> Vec<Rect> {
+    let total: f64 = vals.iter().sum();
+    let mut out = vec![Rect::ZERO; vals.len()];
+    if total <= 0.0 || r.area() <= 0.0 {
+        return out;
+    }
+    let scale = r.area() / total;
+    let mut order: Vec<usize> = (0..vals.len()).filter(|&i| vals.get(i).is_some_and(|v| *v > 0.0)).collect();
+    order.sort_by(|a, b| vals[*b].total_cmp(&vals[*a]));
+    let mut free = r;
+    let mut i = 0;
+    while i < order.len() {
+        let short = free.width().min(free.height());
+        let worst = |row: &[usize]| {
+            let areas: Vec<f64> = row.iter().map(|&k| vals[k] * scale).collect();
+            let sum: f64 = areas.iter().sum();
+            let (mx, mn) = (areas.iter().copied().fold(0.0, f64::max), areas.iter().copied().fold(f64::MAX, f64::min));
+            ((short * short * mx) / (sum * sum)).max((sum * sum) / (short * short * mn))
+        };
+        let mut end = i + 1;
+        while end < order.len() && worst(&order[i..=end]) <= worst(&order[i..end]) {
+            end += 1;
+        }
+        let row = &order[i..end];
+        let sum: f64 = row.iter().map(|&k| vals[k] * scale).sum();
+        let thick = sum / short;
+        let mut at = 0.0;
+        for &k in row {
+            let len = vals[k] * scale / thick;
+            out[k] = if free.width() >= free.height() {
+                Rect::new(free.x0, free.y0 + at, free.x0 + thick, free.y0 + at + len)
+            } else {
+                Rect::new(free.x0 + at, free.y0, free.x0 + at + len, free.y0 + thick)
+            };
+            at += len;
+        }
+        free = if free.width() >= free.height() {
+            Rect::new(free.x0 + thick, free.y0, free.x1, free.y1)
+        } else {
+            Rect::new(free.x0, free.y0 + thick, free.x1, free.y1)
+        };
+        i = end;
+    }
+    out
+}
+
+#[allow(clippy::too_many_arguments)]
+fn treemap(
+    ctx: &mut RenderContext,
+    rctx: &Ctx,
+    c: &Chart,
+    m: Affine,
+    area: Rect,
+    base: f64,
+    vals: &[f64],
+    value_label: Option<&dyn Fn(f64) -> String>,
+) {
+    for (i, t) in squarify(vals, area).into_iter().enumerate() {
+        if t.area() <= 0.0 {
+            continue;
+        }
+        ctx.set_transform(m);
+        ctx.set_paint(color(series_color(rctx, c, i), 1.0));
+        ctx.fill_rect(&t);
+        ctx.set_paint(color(Rgba::WHITE, 1.0));
+        ctx.set_stroke(kurbo::Stroke::new(1.5));
+        ctx.stroke_path(&t.to_path(0.1));
+        let mut text = c.categories.get(i).cloned().unwrap_or_default();
+        if let (Some(f), Some(v)) = (value_label, vals.get(i)) {
+            text = format!("{text}\n{}", f(*v));
+        }
+        let inner = t.inset(-base * 0.3);
+        if inner.width() > base && inner.height() > base {
+            label(ctx, rctx, m, &text, inner, base, Align::Left, Anchor::Top, Rgba::WHITE, false);
+        }
+    }
+}
+
+/// One ring of the innermost level, with the centre left open.
+fn sunburst(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rect, base: f64, vals: &[f64]) {
+    let total: f64 = vals.iter().sum();
+    let r = area.width().min(area.height()) / 2.0 * 0.95;
+    let hole = r * 0.35;
+    let cen = area.center();
+    let mut a0 = -std::f64::consts::FRAC_PI_2;
+    for (i, v) in vals.iter().enumerate() {
+        let sweep = v / total * std::f64::consts::TAU;
+        if sweep <= 0.0 {
+            continue;
+        }
+        let mut p = BezPath::new();
+        p.move_to(Point::new(cen.x + hole * a0.cos(), cen.y + hole * a0.sin()));
+        p.line_to(Point::new(cen.x + r * a0.cos(), cen.y + r * a0.sin()));
+        p.extend(kurbo::Arc::new(cen, (r, r), a0, sweep, 0.0).append_iter(0.1));
+        let a1 = a0 + sweep;
+        p.line_to(Point::new(cen.x + hole * a1.cos(), cen.y + hole * a1.sin()));
+        p.extend(kurbo::Arc::new(cen, (hole, hole), a1, -sweep, 0.0).append_iter(0.1));
+        p.close_path();
+        ctx.set_transform(m);
+        ctx.set_paint(color(series_color(rctx, c, i), 1.0));
+        ctx.fill_path(&p);
+        ctx.set_paint(color(Rgba::WHITE, 1.0));
+        ctx.set_stroke(kurbo::Stroke::new(1.5));
+        ctx.stroke_path(&p);
+        if let Some(name) = c.categories.get(i).filter(|_| sweep > 0.25) {
+            let mid = a0 + sweep / 2.0;
+            let rr = (r + hole) / 2.0;
+            let lp = Point::new(cen.x + rr * mid.cos(), cen.y + rr * mid.sin());
+            label(
+                ctx,
+                rctx,
+                m,
+                name,
+                Rect::new(lp.x - 50.0, lp.y - base, lp.x + 50.0, lp.y + base),
+                base,
+                Align::Center,
+                Anchor::Middle,
+                Rgba::WHITE,
+                false,
+            );
+        }
+        a0 = a1;
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn squarify_tiles_the_area_in_proportion() {
+        let vals = [6.0, 6.0, 4.0, 3.0, 2.0, 2.0, 1.0];
+        let r = Rect::new(0.0, 0.0, 600.0, 400.0);
+        let tiles = squarify(&vals, r);
+        let total: f64 = vals.iter().sum();
+        for (t, v) in tiles.iter().zip(vals) {
+            assert!((t.area() - v / total * r.area()).abs() < 1e-6, "{t:?} for {v}");
+            assert!(t.x0 >= -1e-9 && t.y0 >= -1e-9 && t.x1 <= 600.0 + 1e-6 && t.y1 <= 400.0 + 1e-6, "{t:?}");
+            // Squarified: no sliver tiles.
+            let aspect = t.width().max(t.height()) / t.width().min(t.height());
+            assert!(aspect < 4.0, "{t:?}");
+        }
+        for (i, a) in tiles.iter().enumerate() {
+            for b in &tiles[i + 1..] {
+                assert!(a.intersect(*b).area() < 1e-6, "{a:?} overlaps {b:?}");
+            }
+        }
+        assert!(squarify(&[0.0, 0.0], r).iter().all(|t| t.area() == 0.0));
+    }
+
+    #[test]
+    fn waterfall_bars_float_and_totals_stand() {
+        let c = Chart {
+            kind: ChartType::Waterfall,
+            subtotals: vec![3],
+            series: vec![deckcraft_model::chart::Series { values: vec![Some(100.0), Some(40.0), Some(-25.0), Some(115.0)], ..Default::default() }],
+            ..Default::default()
+        };
+        assert_eq!(c.waterfall_bars(), [(0.0, 100.0), (100.0, 140.0), (140.0, 115.0), (0.0, 115.0)]);
+        assert_eq!(c.value_range(), (0.0, 140.0));
+    }
+}
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..e6570c5c 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -10,6 +10,7 @@
 mod bevel;
 mod camera;
 mod chart;
+mod chartex;
 mod colr;
 
 mod compound;
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..3b9e1a3a 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1711,3 +1711,38 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
     let (w, h) = ink(deckcraft_model::text::TextDir::Vertical);
     assert!(h > w * 3, "vert: stroke on its side {w}x{h}");
 }
+
+#[test]
+fn office_2016_charts_draw_their_own_layouts() {
+    let chart = |kind: ChartType, vals: &[f64], subtotals: Vec<usize>| {
+        let c = Chart {
+            kind,
+            title: None,
+            legend: None,
+            gridlines: false,
+            subtotals,
+            categories: (0..vals.len()).map(|i| format!("C{i}")).collect(),
+            series: vec![deckcraft_model::chart::Series { values: vals.iter().map(|v| Some(*v)).collect(), ..Default::default() }],
+            ..Default::default()
+        };
+        let sh = Shape { id: ShapeId(621), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
+        render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() })
+    };
+    let ink = |img: &crate::Image, x: u32, y: u32| {
+        let p = img.pixel(x, y);
+        p[0] < 235 || p[1] < 235 || p[2] < 235
+    };
+    // Waterfall: the decrease floats (nothing under it near the axis), the total stands on it.
+    let img = chart(ChartType::Waterfall, &[100.0, 40.0, -25.0, 115.0], vec![3]);
+    let plot_bottom = (300..530).rev().find(|&y| ink(&img, 120, y)).unwrap_or(500);
+    let band = |i: f64| (80.0 + (900.0 - 80.0) * (i + 0.5) / 4.0) as u32;
+    assert!(!ink(&img, band(2.0), plot_bottom - 20), "the decrease bar reaches the axis");
+    assert!(ink(&img, band(3.0), plot_bottom - 20), "the total bar doesn't stand on the axis");
+    assert!(ink(&img, band(1.0), 100), "the increase bar is missing");
+    // Funnel, treemap and sunburst fill the middle of the chart.
+    for kind in [ChartType::Funnel, ChartType::Treemap, ChartType::Sunburst] {
+        let img = chart(kind, &[50.0, 30.0, 20.0], vec![]);
+        let covered = (0..540).step_by(10).flat_map(|y| (0..960).step_by(10).map(move |x| (x, y))).filter(|&(x, y)| ink(&img, x, y)).count();
+        assert!(covered > 1000, "{kind:?}: {covered} samples inked");
+    }
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a9cdda81..10e2fa41 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -146,8 +146,10 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, Pareto,
-  box & whisker) are read for their data and written back unchanged, but they're drawn with the
-  bar renderer and an edited one is saved as a plain column chart; region maps aren't read.
+  box & whisker) are read for their data and written back unchanged. Waterfalls (floating bars,
+  totals, connectors), funnels, treemaps (squarified) and sunbursts (innermost ring) are drawn;
+  histograms and box & whisker still use the column renderer, an edited one is saved as a plain
+  column chart, and region maps aren't read.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 

From 4658042de837fa5952fdc0dbbc232ba1f6db0b61 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:16:49 +0300
Subject: [PATCH 173/376] Draw: Ink to Shape converts pen strokes into shapes

Draw > Ink to Shape recognises each pen stroke on the slide's ink layer
as a line, rectangle, oval or isosceles triangle (apex up or down) and
replaces it with that preset shape, outlined in the stroke's colour and
width with no fill. Strokes it can't recognise, and highlighter strokes,
stay ink. The ink shape is removed once it has no strokes left. The
whole conversion is one undo step.

The recogniser (engine/src/inkshape.rs) is pure geometry: ends meeting,
area covered within the bounding box, and spread from the fitted
ellipse. Ribbon big buttons now carry an accessibility label.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/shape.rs         |  85 +++++++++++
 crates/engine/src/inkshape.rs          | 192 +++++++++++++++++++++++++
 crates/engine/src/lib.rs               |   1 +
 crates/ui-egui/src/inktoshape_tests.rs |  60 ++++++++
 crates/ui-egui/src/ribbon.rs           |  12 +-
 crates/ui-egui/src/widgets.rs          |   3 +
 docs/parity-checklist.md               |   6 +-
 7 files changed, 354 insertions(+), 5 deletions(-)
 create mode 100644 crates/engine/src/inkshape.rs
 create mode 100644 crates/ui-egui/src/inktoshape_tests.rs

diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..aabac43f 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -29,6 +29,15 @@ pub fn specs() -> Vec<CommandSpec> {
             has_slide,
             freeform
         ),
+        cmd!(
+            "draw.inkToShape",
+            "Ink to Shape",
+            ["Draw", "Convert"],
+            None,
+            "{} → {shapes: [ids], kept: n} turns recognisable ink strokes on the slide into lines, rectangles, ellipses and triangles",
+            has_slide,
+            ink_to_shape
+        ),
         cmd!(query "shape.sites", "Connection Sites", [], None, "{id} → [[x, y]] connection sites in slide points", has_slide, sites),
         cmd!("shape.move", "Move", [], None, "{dx?, dy?: pt (relative) | x?, y?: pt (absolute), ids?}", has_selection, move_by),
         cmd!("shape.resize", "Size", ["Shape Format", "Size"], None, "{w?, h?: pt, lockAspect?: bool, ids?}", has_selection, resize),
@@ -860,3 +869,79 @@ fn freeform(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     Ok(json!({"id": id.0}))
 }
+
+/// Draw › Ink to Shape: each recognisable stroke of the slide's ink becomes a preset shape
+/// outlined in the stroke's colour and width; the rest stays ink. One undo step.
+fn ink_to_shape(s: &mut Session, _p: &Value) -> Result<Value> {
+    use crate::inkshape::{Recognized, recognize};
+    use deckcraft_model::{Shape, ShapeId, ShapeKind};
+    let shapes = s.doc()?.shapes();
+    let Some(ink) = shapes.iter().find(|sh| matches!(sh.kind, ShapeKind::Ink { .. })) else {
+        return Ok(json!({"shapes": [], "kept": 0}));
+    };
+    let (ink_id, off) = (ink.id, ink.xfrm.map(|x| (x.x, x.y)).unwrap_or((0.0, 0.0)));
+    let ShapeKind::Ink { strokes } = &ink.kind else { return Ok(json!({"shapes": [], "kept": 0})) };
+    let found: Vec<Option<Recognized>> = strokes
+        .iter()
+        .map(|st| if st.highlighter { None } else { recognize(&st.points.iter().map(|(x, y, _)| (x + off.0, y + off.1)).collect::<Vec<_>>()) })
+        .collect();
+    if found.iter().all(Option::is_none) {
+        return Ok(json!({"shapes": [], "kept": strokes.len()}));
+    }
+    s.edit(|doc, sel| {
+        let mut new = vec![];
+        let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("draw.inkToShape", "no slide"))?;
+        let Some(pos) = list.iter().position(|sh| sh.id == ink_id) else { return Err(bad("draw.inkToShape", "ink gone")) };
+        let ShapeKind::Ink { strokes } = &mut list[pos].kind else { return Err(bad("draw.inkToShape", "not ink")) };
+        let all = std::mem::take(strokes);
+        let mut kept = vec![];
+        let mut made = vec![];
+        for (st, r) in all.into_iter().zip(found.iter()) {
+            let Some(r) = r else {
+                kept.push(st);
+                continue;
+            };
+            let (preset, xfrm) = match *r {
+                Recognized::Line { x0, y0, x1, y1 } => {
+                    ("line", crate::tools::line_xfrm(deckcraft_geom::Point::new(x0, y0), deckcraft_geom::Point::new(x1, y1), 0.0))
+                }
+                Recognized::Rect { x, y, w, h } => ("rect", deckcraft_geom::Xfrm::new(x, y, w, h)),
+                Recognized::Ellipse { x, y, w, h } => ("ellipse", deckcraft_geom::Xfrm::new(x, y, w, h)),
+                Recognized::Triangle { x, y, w, h, flip_v } => ("triangle", deckcraft_geom::Xfrm { flip_v, ..deckcraft_geom::Xfrm::new(x, y, w, h) }),
+            };
+            made.push((preset, xfrm, st.color, st.width));
+        }
+        let remaining = kept.len();
+        *strokes = kept;
+        if remaining == 0 {
+            list.remove(pos);
+        }
+        for (preset, xfrm, color, width) in made {
+            let id = ShapeId(doc.alloc_id());
+            let name = format!(
+                "{} {}",
+                match preset {
+                    "line" => "Straight Connector",
+                    "rect" => "Rectangle",
+                    "ellipse" => "Oval",
+                    _ => "Isosceles Triangle",
+                },
+                id.0
+            );
+            let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("draw.inkToShape", "no slide"))?;
+            list.push(Shape {
+                id,
+                name,
+                xfrm: Some(xfrm),
+                geom: Geom::preset(preset),
+                fill: Some(Fill::None),
+                line: Some(Line::solid(ColorRef::rgb(color), width.clamp(0.25, 100.0))),
+                kind: ShapeKind::Shape,
+                ..Default::default()
+            });
+            new.push(id);
+        }
+        sel.shapes = new.clone();
+        Ok(json!({"shapes": new.iter().map(|i| i.0).collect::<Vec<_>>(), "kept": remaining}))
+    })
+}
diff --git a/crates/engine/src/inkshape.rs b/crates/engine/src/inkshape.rs
new file mode 100644
index 00000000..593bcbc1
--- /dev/null
+++ b/crates/engine/src/inkshape.rs
@@ -0,0 +1,192 @@
+//! Draw › Ink to Shape: recognise a hand-drawn stroke as a line, rectangle, ellipse or triangle.
+//!
+//! Pure geometry so it is unit-tested with synthetic strokes. A stroke is closed when its ends
+//! meet; a closed stroke is classified by how much of its bounding box it covers (rectangle ≈ 1,
+//! ellipse ≈ π/4, triangle ≈ ½) and, for ellipses, by how evenly it keeps its distance from the
+//! centre.
+
+/// What a stroke was recognised as, in its bounding box `(x, y, w, h)`.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum Recognized {
+    /// From `(x0, y0)` to `(x1, y1)`.
+    Line {
+        x0: f64,
+        y0: f64,
+        x1: f64,
+        y1: f64,
+    },
+    Rect {
+        x: f64,
+        y: f64,
+        w: f64,
+        h: f64,
+    },
+    Ellipse {
+        x: f64,
+        y: f64,
+        w: f64,
+        h: f64,
+    },
+    /// Apex at the top (`flip_v` false) or at the bottom.
+    Triangle {
+        x: f64,
+        y: f64,
+        w: f64,
+        h: f64,
+        flip_v: bool,
+    },
+}
+
+/// Strokes smaller than this (points) stay ink.
+const MIN_SIZE: f64 = 6.0;
+const MAX_POINTS: usize = 100_000;
+
+pub fn recognize(points: &[(f64, f64)]) -> Option<Recognized> {
+    let pts: Vec<(f64, f64)> = points.iter().copied().filter(|(x, y)| x.is_finite() && y.is_finite()).take(MAX_POINTS).collect();
+    if pts.len() < 2 {
+        return None;
+    }
+    let (mut x0, mut y0, mut x1, mut y1) = (f64::MAX, f64::MAX, f64::MIN, f64::MIN);
+    for (x, y) in &pts {
+        x0 = x0.min(*x);
+        y0 = y0.min(*y);
+        x1 = x1.max(*x);
+        y1 = y1.max(*y);
+    }
+    let (w, h) = (x1 - x0, y1 - y0);
+    let size = w.max(h);
+    if !size.is_finite() || size < MIN_SIZE {
+        return None;
+    }
+    let length: f64 = pts.windows(2).map(|p| (p[1].0 - p[0].0).hypot(p[1].1 - p[0].1)).sum();
+    let (first, last) = (pts[0], pts[pts.len() - 1]);
+    let gap = (last.0 - first.0).hypot(last.1 - first.1);
+    if length <= 0.0 {
+        return None;
+    }
+    // Open stroke: a line if nearly straight, otherwise not a shape.
+    if gap > 0.25 * size {
+        return (gap / length > 0.92).then_some(Recognized::Line { x0: first.0, y0: first.1, x1: last.0, y1: last.1 });
+    }
+    // Closed but flat: a line drawn back and forth isn't a shape.
+    if w.min(h) < 0.15 * size {
+        return None;
+    }
+    // Covered area (shoelace, the gap closed) over the bounding box.
+    let mut a2 = 0.0;
+    for k in 0..pts.len() {
+        let (p, q) = (pts[k], pts[(k + 1) % pts.len()]);
+        a2 += p.0 * q.1 - q.0 * p.1;
+    }
+    let cover = (a2.abs() / 2.0) / (w * h);
+    // Ellipse fit: distance from the centre in box-normalised units should stay near 1.
+    let (cx, cy) = (x0 + w / 2.0, y0 + h / 2.0);
+    let radial: Vec<f64> = pts.iter().map(|(x, y)| ((x - cx) / (w / 2.0)).hypot((y - cy) / (h / 2.0))).collect();
+    let spread = radial.iter().map(|r| (r - 1.0).abs()).sum::<f64>() / radial.len() as f64;
+    if cover > 0.86 {
+        Some(Recognized::Rect { x: x0, y: y0, w, h })
+    } else if cover > 0.66 && spread < 0.12 {
+        Some(Recognized::Ellipse { x: x0, y: y0, w, h })
+    } else if (0.35..0.66).contains(&cover) {
+        // Apex: the side of the box with fewer points near it is where the triangle narrows.
+        let near_top = pts.iter().filter(|(_, y)| *y < y0 + h * 0.15).count();
+        let near_bottom = pts.iter().filter(|(_, y)| *y > y1 - h * 0.15).count();
+        Some(Recognized::Triangle { x: x0, y: y0, w, h, flip_v: near_bottom < near_top })
+    } else {
+        None
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn poly(corners: &[(f64, f64)], per_side: usize) -> Vec<(f64, f64)> {
+        let mut v = vec![];
+        for k in 0..corners.len() {
+            let (a, b) = (corners[k], corners[(k + 1) % corners.len()]);
+            for i in 0..per_side {
+                let t = i as f64 / per_side as f64;
+                // A little hand wobble.
+                let wob = ((i * 7 + k * 3) % 5) as f64 * 0.4 - 0.8;
+                v.push((a.0 + (b.0 - a.0) * t + wob, a.1 + (b.1 - a.1) * t - wob));
+            }
+        }
+        v.push((corners[0].0 + 2.0, corners[0].1 + 1.5));
+        v
+    }
+
+    #[test]
+    fn rectangles_ellipses_triangles_and_lines() {
+        let r = recognize(&poly(&[(100.0, 100.0), (300.0, 100.0), (300.0, 200.0), (100.0, 200.0)], 30)).unwrap();
+        assert!(matches!(r, Recognized::Rect { w, h, .. } if (w - 200.0).abs() < 4.0 && (h - 100.0).abs() < 4.0), "{r:?}");
+        let ell: Vec<(f64, f64)> = (0..=80)
+            .map(|i| {
+                let a = i as f64 / 80.0 * std::f64::consts::TAU;
+                (200.0 + 120.0 * a.cos() + (i % 3) as f64 * 0.5, 150.0 + 60.0 * a.sin())
+            })
+            .collect();
+        assert!(matches!(recognize(&ell), Some(Recognized::Ellipse { .. })), "{:?}", recognize(&ell));
+        let up = recognize(&poly(&[(200.0, 50.0), (300.0, 250.0), (100.0, 250.0)], 30)).unwrap();
+        assert!(matches!(up, Recognized::Triangle { flip_v: false, .. }), "{up:?}");
+        let down = recognize(&poly(&[(100.0, 50.0), (300.0, 50.0), (200.0, 250.0)], 30)).unwrap();
+        assert!(matches!(down, Recognized::Triangle { flip_v: true, .. }), "{down:?}");
+        let line: Vec<(f64, f64)> = (0..=40).map(|i| (10.0 + i as f64 * 5.0, 20.0 + i as f64 * 2.0 + (i % 2) as f64 * 0.6)).collect();
+        assert!(matches!(recognize(&line), Some(Recognized::Line { x0, x1, .. }) if x0 < x1), "{:?}", recognize(&line));
+    }
+
+    #[test]
+    fn scribbles_dots_and_garbage_stay_ink() {
+        assert_eq!(recognize(&[]), None);
+        assert_eq!(recognize(&[(1.0, 1.0)]), None);
+        assert_eq!(recognize(&[(0.0, 0.0), (2.0, 2.0), (1.0, 3.0)]), None, "too small");
+        let zig: Vec<(f64, f64)> = (0..40).map(|i| (i as f64 * 5.0, if i % 2 == 0 { 0.0 } else { 60.0 })).collect();
+        assert_eq!(recognize(&zig), None, "an open zigzag is no line");
+        assert_eq!(recognize(&[(f64::NAN, 0.0), (f64::INFINITY, 1.0)]), None);
+        let there_and_back: Vec<(f64, f64)> = (0..=20).chain((0..=20).rev()).map(|i| (i as f64 * 10.0, 5.0)).collect();
+        assert_eq!(recognize(&there_and_back), None);
+    }
+
+    #[test]
+    fn ink_to_shape_command_converts_and_undoes() {
+        use deckcraft_model::{InkStroke, Shape, ShapeId, ShapeKind};
+        use serde_json::json;
+        let mut s = crate::Session::with_new();
+        s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+        let rect = poly(&[(100.0, 100.0), (300.0, 100.0), (300.0, 200.0), (100.0, 200.0)], 30);
+        let zig: Vec<(f64, f64)> = (0..40).map(|i| (i as f64 * 5.0, if i % 2 == 0 { 300.0 } else { 360.0 })).collect();
+        let mk = |v: &[(f64, f64)]| InkStroke {
+            points: v.iter().map(|(x, y)| (*x, *y, 0.5)).collect(),
+            color: deckcraft_color::Rgba::rgb(200, 0, 0),
+            width: 3.0,
+            highlighter: false,
+        };
+        let strokes = vec![mk(&rect), mk(&zig)];
+        s.edit(|doc, sel| {
+            let id = ShapeId(doc.alloc_id());
+            crate::shapes_mut(doc, sel).unwrap().push(Shape {
+                id,
+                name: "Ink".into(),
+                xfrm: Some(deckcraft_geom::Xfrm::new(0.0, 0.0, 960.0, 540.0)),
+                kind: ShapeKind::Ink { strokes },
+                ..Default::default()
+            });
+            Ok(serde_json::Value::Null)
+        })
+        .unwrap();
+        let n0 = s.doc().unwrap().shapes().len();
+        let r = s.execute("draw.inkToShape", &json!({})).unwrap();
+        assert_eq!(r["kept"], 1);
+        let sh = s.doc().unwrap().shapes();
+        assert_eq!(sh.len(), n0 + 1, "ink keeps the zigzag, one rectangle added");
+        let made = sh.last().unwrap();
+        assert!(matches!(&made.geom, deckcraft_model::Geom::Preset { name, .. } if name == "rect"));
+        assert_eq!(made.line.as_ref().and_then(|l| l.width), Some(3.0));
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(s.doc().unwrap().shapes().len(), n0);
+        // Nothing recognisable: a no-op, not an error. Empty slide too.
+        s.execute("draw.inkToShape", &json!({})).unwrap();
+        s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+        assert_eq!(s.execute("draw.inkToShape", &json!({})).unwrap()["kept"], 0);
+    }
+}
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..83c0a510 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -11,6 +11,7 @@ pub mod cmd;
 pub mod connect;
 pub mod fonts;
 pub mod guard;
+pub mod inkshape;
 pub mod keys;
 pub mod links;
 pub mod recovery;
diff --git a/crates/ui-egui/src/inktoshape_tests.rs b/crates/ui-egui/src/inktoshape_tests.rs
new file mode 100644
index 00000000..7a7ebafc
--- /dev/null
+++ b/crates/ui-egui/src/inktoshape_tests.rs
@@ -0,0 +1,60 @@
+//! Draw › Ink to Shape driven through the ribbon: pen a rough rectangle on the slide with the
+//! mouse, press the button, get a rectangle shape.
+
+use deckcraft_engine::Session;
+use egui::{Modifiers, PointerButton, Pos2};
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+#[test]
+fn pen_a_rectangle_then_ink_to_shape() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.tab = "Draw".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.get_by_label("Black Pen").click();
+    h.run_steps(2);
+    let (slide, k) = (h.state().slide_rect.unwrap(), h.state().canvas_scale);
+    let at = |x: f32, y: f32| slide.min + egui::vec2(x * k, y * k);
+    let corners = [(200.0, 150.0), (600.0, 150.0), (600.0, 400.0), (200.0, 400.0), (204.0, 152.0)];
+    h.hover_at(at(200.0, 150.0));
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: at(200.0, 150.0), button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    for w in corners.windows(2) {
+        for i in 1..=12 {
+            let t = i as f32 / 12.0;
+            let p: Pos2 = at(w[0].0 + (w[1].0 - w[0].0) * t, w[0].1 + (w[1].1 - w[0].1) * t);
+            h.event(egui::Event::PointerMoved(p));
+            h.run_steps(1);
+        }
+    }
+    h.event(egui::Event::PointerButton { pos: at(204.0, 152.0), button: PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(3);
+    let has_ink = |h: &Harness<'_, SlideApp>| {
+        h.state().session.active().unwrap().shapes().iter().any(|s| matches!(s.kind, deckcraft_model::ShapeKind::Ink { .. }))
+    };
+    assert!(has_ink(&h), "the pen drew a stroke");
+    h.get_by_label("Ink to Shape").click();
+    h.run_steps(3);
+    assert!(!has_ink(&h), "the only stroke became a shape");
+    let st = h.state().session.active().unwrap();
+    let sh = st.shapes().last().unwrap();
+    assert!(matches!(&sh.geom, deckcraft_model::Geom::Preset { name, .. } if name == "rect"), "{:?}", sh.geom);
+    let x = sh.xfrm.unwrap();
+    assert!((x.x - 200.0).abs() < 10.0 && (x.w - 400.0).abs() < 15.0 && (x.h - 250.0).abs() < 15.0, "{x:?}");
+    assert_eq!(st.selection.shapes, vec![sh.id]);
+    if let Ok(img) = h.render() {
+        let _ = img.save("/tmp/ink_to_shape.png");
+    }
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..80cf0375 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1200,8 +1200,12 @@ fn draw(app: &mut SlideApp, ui: &mut Ui) {
         }
     });
     group(ui, |ui| {
-        let r = big_button(ui, Icon::InkToShape, "Ink to\nShape", false);
-        let _ = r.on_hover_text("Ink to Shape (coming soon)");
+        let has_ink = app.session.doc().is_ok_and(|d| d.shapes().iter().any(|s| matches!(s.kind, deckcraft_model::ShapeKind::Ink { .. })));
+        let r = big_button(ui, Icon::InkToShape, "Ink to\nShape", has_ink);
+        if r.on_hover_text("Ink to Shape: turn drawn lines, rectangles, ovals and triangles into shapes").clicked() {
+            app.session.set_tool(ToolKind::Select);
+            run(app, "draw.inkToShape", json!({}));
+        }
         let r = big_button(ui, Icon::InkToText, "Ink to\nText", false);
         let _ = r.on_hover_text("Ink to Text (coming soon)");
         let r = big_button(ui, Icon::InkToMath, "Ink to\nMath", false);
@@ -2420,3 +2424,7 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+#[cfg(test)]
+#[path = "inktoshape_tests.rs"]
+mod inktoshape_tests;
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 5827b396..97480599 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -39,6 +39,9 @@ pub fn big_button_ex(ui: &mut Ui, icon: Icon, label: &str, enabled: bool, split:
     let text_w = lines.iter().map(|l| ui.fonts_mut(|f| f.layout_no_wrap(l.to_string(), font.clone(), t.text).size().x)).fold(0.0f32, f32::max);
     let w = (text_w + 10.0 + if split && lines.len() == 1 { 10.0 } else { 0.0 }).max(40.0);
     let (rect, resp) = ui.allocate_exact_size(vec2(w, RIBBON_H - 2.0), if enabled { Sense::click() } else { Sense::hover() });
+    // Named for screen readers and UI tests ("Ink to\nShape" reads "Ink to Shape").
+    let spoken = label.replace('\n', " ");
+    resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, &spoken));
     let painter = ui.painter_at(rect.expand(1.0));
     let (main_rect, arrow_rect) = if split {
         (Rect::from_min_max(rect.min, pos2(rect.max.x, rect.min.y + 38.0)), Some(Rect::from_min_max(pos2(rect.min.x, rect.min.y + 38.0), rect.max)))
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..bd4a36ce 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -9,7 +9,7 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 13 | 16 | 25 | 39% |
 
 | Area | Parity |
 |---|---|
@@ -31,7 +31,7 @@ The summary between `<!-- SUMMARY -->
 | Animations | 79% |
 | Slide show | 66% |
 | Review | 60% |
-| Draw | 33% |
+| Draw | 50% |
 | Undo & clipboard | 88% |
 | Automation (✱) | 100% |
 | Platforms (✱) | 67% |
@@ -224,7 +224,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Review | Compare presentations | P2 | M |
 | Review | Track changes / version history | P2 | M |
 | Draw | Ink pens, highlighter, eraser | P1 | P |
-| Draw | Ink to shape / text | P2 | M |
+| Draw | Ink to shape / text | P2 | P |
 | Undo & clipboard | Unlimited undo/redo | P0 | D |
 | Undo & clipboard | Cut, copy, paste shapes and slides | P0 | D |
 | Undo & clipboard | Paste special (keep formatting, picture, text only) | P1 | P |

From f3ca5a63b9ab5e47875651a1f6da224b68630af8 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:17:51 +0300
Subject: [PATCH 174/376] Table: borders, cell margins and cell text alignment

The model, renderer and PPTX already carried cell borders, diagonals,
margins and vertical alignment, but nothing set them. New commands:
table.borders (all, outside, inside, inside horizontal/vertical, each
side, diagonals or none, with pen colour, width and dash; the facing
side of a neighbouring cell follows, as in PowerPoint), table.cellMargins
(Normal, None, Narrow, Wide or per side) and table.cellAlign. They act on
the given cells, the selected range, the cell with the caret, or the
whole table. Table Design gains a Borders menu with pen weight, style and
colour; Table Layout's Top/Center/Bottom now align cell text (they set
the text body's anchor, which cells override) and gain Cell Margins.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/table.rs | 183 +++++++++++++++++++++++++++++++--
 crates/engine/src/tests.rs     |  63 ++++++++++++
 crates/ui-egui/src/lib.rs      |   3 +
 crates/ui-egui/src/ribbon.rs   |  59 ++++++++++-
 docs/parity-checklist.md       |   8 +-
 5 files changed, 300 insertions(+), 16 deletions(-)

diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index e9f6f164..750e389b 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -55,6 +55,33 @@ pub fn specs() -> Vec<CommandSpec> {
             has_selection,
             cell_fill
         ),
+        cmd!(
+            "table.borders",
+            "Borders",
+            ["Table Design", "Draw Borders"],
+            None,
+            "{which: all|outside|inside|insideH|insideV|top|bottom|left|right|diagDown|diagUp|none, color?, width?: pt, dash?: solid|dash|dot…, cells?: [[r,c],…] (default: selected cells or all), id?}",
+            has_selection,
+            borders
+        ),
+        cmd!(
+            "table.cellMargins",
+            "Cell Margins",
+            ["Table Layout", "Alignment"],
+            None,
+            "{preset?: normal|none|narrow|wide, left?, right?, top?, bottom?: pt, cells?, id?}",
+            has_selection,
+            cell_margins
+        ),
+        cmd!(
+            "table.cellAlign",
+            "Align Cell Text",
+            ["Table Layout", "Alignment"],
+            None,
+            "{anchor: top|middle|bottom, cells?, id?}",
+            has_selection,
+            cell_align
+        ),
         cmd!("table.distributeRows", "Distribute Rows", ["Table Layout", "Cell Size"], None, "{id?}", has_selection, |s, p| distribute(s, p, true)),
         cmd!("table.distributeColumns", "Distribute Columns", ["Table Layout", "Cell Size"], None, "{id?}", has_selection, |s, p| distribute(
             s, p, false
@@ -195,20 +222,27 @@ fn options(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
-fn cell_fill(s: &mut Session, p: &Value) -> Result<Value> {
-    let fill = if bool_or(p, "none", false) { Some(deckcraft_model::Fill::None) } else { color_param(p, "color").map(deckcraft_model::Fill::solid) };
+/// The cells a command acts on: `cells`, else the selected cell range, else the cell holding the
+/// caret, else every cell.
+fn target_cells(s: &Session, p: &Value) -> Result<impl Fn(&Table) -> Vec<(usize, usize)> + use<>> {
     let cells: Option<Vec<(usize, usize)>> = p
         .get("cells")
         .and_then(Value::as_array)
-        .map(|a| a.iter().filter_map(|c| Some((c.get(0)?.as_u64()? as usize, c.get(1)?.as_u64()? as usize))).collect());
-    let sel = s.doc()?.selection.cells;
+        .map(|a| a.iter().take(100_000).filter_map(|c| Some((c.get(0)?.as_u64()? as usize, c.get(1)?.as_u64()? as usize))).collect());
+    let st = s.doc()?;
+    let sel = st.selection.cells.map(|(_, a, b)| (a, b)).or_else(|| st.selection.text.as_ref().and_then(|t| t.cell).map(|c| (c, c)));
+    Ok(move |t: &Table| match (&cells, sel) {
+        (Some(c), _) => c.clone(),
+        (None, Some((a, b))) => (a.0.min(b.0)..=a.0.max(b.0)).flat_map(|r| (a.1.min(b.1)..=a.1.max(b.1)).map(move |c| (r, c))).collect(),
+        _ => (0..t.n_rows()).flat_map(|r| (0..t.n_cols()).map(move |c| (r, c))).collect(),
+    })
+}
+
+fn cell_fill(s: &mut Session, p: &Value) -> Result<Value> {
+    let fill = if bool_or(p, "none", false) { Some(deckcraft_model::Fill::None) } else { color_param(p, "color").map(deckcraft_model::Fill::solid) };
+    let targets = target_cells(s, p)?;
     with_table(s, p, "table.cellFill", move |t| {
-        let list: Vec<(usize, usize)> = match (&cells, sel) {
-            (Some(c), _) => c.clone(),
-            (None, Some((_, a, b))) => (a.0.min(b.0)..=a.0.max(b.0)).flat_map(|r| (a.1.min(b.1)..=a.1.max(b.1)).map(move |c| (r, c))).collect(),
-            _ => (0..t.n_rows()).flat_map(|r| (0..t.n_cols()).map(move |c| (r, c))).collect(),
-        };
-        for (r, c) in list {
+        for (r, c) in targets(t) {
             if let Some(cell) = t.cell_mut(r, c) {
                 cell.fill.clone_from(&fill);
             }
@@ -217,6 +251,135 @@ fn cell_fill(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
+const LEFT: usize = 0;
+const RIGHT: usize = 1;
+const TOP: usize = 2;
+const BOTTOM: usize = 3;
+
+fn borders(s: &mut Session, p: &Value) -> Result<Value> {
+    use deckcraft_model::Line;
+    let which = str_param(p, "which").unwrap_or("all").to_string();
+    const WHICH: [&str; 12] = ["all", "outside", "inside", "insideH", "insideV", "top", "bottom", "left", "right", "diagDown", "diagUp", "none"];
+    if !WHICH.contains(&which.as_str()) {
+        return Err(bad("table.borders", format!("unknown `which` {which:?}; one of {}", WHICH.join(", "))));
+    }
+    let color = color_param(p, "color").unwrap_or_else(|| deckcraft_model::ColorRef::rgb(deckcraft_color::Rgba::rgb(0, 0, 0)));
+    let width = f64_param(p, "width").filter(|w| w.is_finite()).unwrap_or(1.0).clamp(0.0, 100.0);
+    let mut line = Line::solid(color, width);
+    if let Some(d) = str_param(p, "dash").filter(|d| *d != "solid") {
+        if !deckcraft_model::style::Dash::PRESETS.contains(&d) {
+            return Err(bad("table.borders", format!("unknown dash {d:?}; one of {}", deckcraft_model::style::Dash::PRESETS.join(", "))));
+        }
+        line.dash = Some(deckcraft_model::style::Dash::Preset { name: d.to_string() });
+    }
+    // "none" clears to no line, so the table style's own lines don't show through either.
+    let line = if which == "none" { Line::none() } else { line };
+    let targets = target_cells(s, p)?;
+    with_table(s, p, "table.borders", move |t| {
+        let list = targets(t);
+        let (Some(r0), Some(r1), Some(c0), Some(c1)) =
+            (list.iter().map(|x| x.0).min(), list.iter().map(|x| x.0).max(), list.iter().map(|x| x.1).min(), list.iter().map(|x| x.1).max())
+        else {
+            return Ok(());
+        };
+        let (rows, cols) = (t.n_rows(), t.n_cols());
+        // Set one side of a cell and the facing side of its neighbour, as PowerPoint does.
+        let set = |t: &mut Table, r: usize, c: usize, side: usize| {
+            if let Some(cell) = t.cell_mut(r, c) {
+                cell.borders[side] = Some(line.clone());
+            }
+            let n = match side {
+                LEFT => c.checked_sub(1).map(|c| (r, c, RIGHT)),
+                RIGHT => (c + 1 < cols).then_some((r, c + 1, LEFT)),
+                TOP => r.checked_sub(1).map(|r| (r, c, BOTTOM)),
+                _ => (r + 1 < rows).then_some((r + 1, c, TOP)),
+            };
+            if let Some((r, c, side)) = n
+                && let Some(cell) = t.cell_mut(r, c)
+            {
+                cell.borders[side] = Some(line.clone());
+            }
+        };
+        for (r, c) in list {
+            if r < r0 || r > r1 || c < c0 || c > c1 {
+                continue;
+            }
+            let outer = [c == c0, c == c1, r == r0, r == r1];
+            for side in [LEFT, RIGHT, TOP, BOTTOM] {
+                let horizontal = side == TOP || side == BOTTOM;
+                let on = match which.as_str() {
+                    "all" | "none" => true,
+                    "outside" => outer[side],
+                    "inside" => !outer[side],
+                    "insideH" => horizontal && !outer[side],
+                    "insideV" => !horizontal && !outer[side],
+                    "top" => side == TOP && outer[side],
+                    "bottom" => side == BOTTOM && outer[side],
+                    "left" => side == LEFT && outer[side],
+                    "right" => side == RIGHT && outer[side],
+                    _ => false,
+                };
+                if on {
+                    set(t, r, c, side);
+                }
+            }
+            if let Some(cell) = t.cell_mut(r, c) {
+                match which.as_str() {
+                    "diagDown" => cell.diag_down = Some(line.clone()),
+                    "diagUp" => cell.diag_up = Some(line.clone()),
+                    "none" => {
+                        cell.diag_down = None;
+                        cell.diag_up = None;
+                    }
+                    _ => {}
+                }
+            }
+        }
+        Ok(())
+    })
+}
+
+fn cell_margins(s: &mut Session, p: &Value) -> Result<Value> {
+    // PowerPoint's presets (left/right, top/bottom).
+    let base = match str_param(p, "preset") {
+        Some("none") => [0.0; 4],
+        Some("narrow") => [3.6; 4],
+        Some("wide") => [14.4, 14.4, 14.4, 14.4],
+        Some("normal") | None => [7.2, 7.2, 3.6, 3.6],
+        Some(o) => return Err(bad("table.cellMargins", format!("unknown preset {o:?}; one of normal, none, narrow, wide"))),
+    };
+    let side = |k: &str, i: usize| f64_param(p, k).filter(|v| v.is_finite()).map_or(base[i], |v| v.clamp(0.0, 400.0));
+    let m = [side("left", 0), side("right", 1), side("top", 2), side("bottom", 3)];
+    let targets = target_cells(s, p)?;
+    with_table(s, p, "table.cellMargins", move |t| {
+        for (r, c) in targets(t) {
+            if let Some(cell) = t.cell_mut(r, c) {
+                cell.margins = Some(m);
+            }
+        }
+        Ok(())
+    })
+}
+
+fn cell_align(s: &mut Session, p: &Value) -> Result<Value> {
+    use deckcraft_model::text::Anchor;
+    let a = match str_param(p, "anchor").unwrap_or("top") {
+        "middle" | "center" | "ctr" => Anchor::Middle,
+        "bottom" | "b" => Anchor::Bottom,
+        "top" | "t" => Anchor::Top,
+        o => return Err(bad("table.cellAlign", format!("unknown anchor {o:?}; one of top, middle, bottom"))),
+    };
+    let targets = target_cells(s, p)?;
+    with_table(s, p, "table.cellAlign", move |t| {
+        for (r, c) in targets(t) {
+            if let Some(cell) = t.cell_mut(r, c) {
+                cell.anchor = Some(a);
+            }
+        }
+        Ok(())
+    })
+}
+
 fn distribute(s: &mut Session, p: &Value, rows: bool) -> Result<Value> {
     with_table(s, p, "table.distribute", move |t| {
         if rows {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..02b3ffb4 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,66 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn table_borders_margins_and_cell_alignment() {
+    let mut s = session();
+    let id = s.execute("insert.table", &json!({"rows": 3, "cols": 3, "rect": [100.0, 100.0, 300.0, 120.0]})).unwrap()["id"].clone();
+    let table = |s: &Session| {
+        let st = s.doc().unwrap();
+        let sh = st.shapes().iter().find(|sh| json!(sh.id) == id).unwrap().clone();
+        let deckcraft_model::ShapeKind::Table(t) = sh.kind else { panic!("not a table") };
+        t
+    };
+    // Outside borders round the top-left 2×2 block; neighbours get the facing side too.
+    let block = json!([[0, 0], [0, 1], [1, 0], [1, 1]]);
+    s.execute("table.borders", &json!({"id": id, "which": "outside", "cells": block, "color": "#FF0000", "width": 2.0, "dash": "dash"})).unwrap();
+    let t = table(&s);
+    let w = |r: usize, c: usize, side: usize| t.rows[r].cells[c].borders[side].as_ref().and_then(|l| l.width);
+    assert_eq!(w(0, 0, 0), Some(2.0));
+    assert_eq!(w(0, 0, 2), Some(2.0));
+    assert_eq!(w(0, 0, 1), None, "inside edge untouched");
+    assert_eq!(w(1, 1, 1), Some(2.0));
+    assert_eq!(w(1, 2, 0), Some(2.0), "neighbour's facing side");
+    assert_eq!(w(2, 1, 2), Some(2.0), "neighbour below");
+    assert!(matches!(&t.rows[0].cells[0].borders[0].as_ref().unwrap().dash, Some(deckcraft_model::style::Dash::Preset { name }) if name == "dash"));
+    // Inside horizontal only for the block.
+    s.execute("table.borders", &json!({"id": id, "which": "insideH", "cells": block})).unwrap();
+    let t = table(&s);
+    assert!(t.rows[0].cells[0].borders[3].is_some() && t.rows[1].cells[0].borders[2].is_some());
+    assert!(t.rows[0].cells[0].borders[1].is_none());
+    // Diagonal and none.
+    s.execute("table.borders", &json!({"id": id, "which": "diagDown", "cells": [[2, 2]]})).unwrap();
+    assert!(table(&s).rows[2].cells[2].diag_down.is_some());
+    s.execute("table.borders", &json!({"id": id, "which": "none"})).unwrap();
+    let t = table(&s);
+    assert!(
+        t.rows
+            .iter()
+            .flat_map(|r| &r.cells)
+            .all(|c| c.diag_down.is_none() && c.borders.iter().all(|b| b.as_ref().is_some_and(|l| l.fill == Some(deckcraft_model::Fill::None))))
+    );
+    assert!(s.execute("table.borders", &json!({"id": id, "which": "sideways"})).is_err());
+    // Margins and vertical alignment.
+    s.execute("table.cellMargins", &json!({"id": id, "preset": "wide", "cells": [[0, 0]]})).unwrap();
+    s.execute("table.cellMargins", &json!({"id": id, "preset": "none", "left": 5.0, "cells": [[0, 1]]})).unwrap();
+    s.execute("table.cellAlign", &json!({"id": id, "anchor": "middle"})).unwrap();
+    let t = table(&s);
+    assert_eq!(t.rows[0].cells[0].margins, Some([14.4; 4]));
+    assert_eq!(t.rows[0].cells[1].margins, Some([5.0, 0.0, 0.0, 0.0]));
+    assert!(t.rows.iter().flat_map(|r| &r.cells).all(|c| c.anchor == Some(deckcraft_model::text::Anchor::Middle)));
+    // Survives PPTX.
+    let p = s.doc().unwrap().doc.as_ref().clone();
+    let back = deckcraft_pptx::import(&deckcraft_pptx::export(&p).unwrap()).unwrap();
+    let bt = back
+        .slides
+        .iter()
+        .flat_map(|sl| &sl.shapes)
+        .find_map(|sh| if let deckcraft_model::ShapeKind::Table(t) = &sh.kind { Some(t.clone()) } else { None })
+        .unwrap();
+    assert_eq!(bt.rows[0].cells[0].margins, Some([14.4; 4]));
+    assert_eq!(bt.rows[1].cells[1].anchor, Some(deckcraft_model::text::Anchor::Middle));
+    // One undo step each.
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert!(table(&s).rows[0].cells[0].anchor.is_none());
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..357855f4 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -178,6 +178,8 @@ pub struct Perf {
 }
 
 pub struct SlideApp {
+    /// Table Design's border pen (`color`, `width`, `dash` for `table.borders`).
+    pub table_pen: serde_json::Value,
     pub session: Session,
     pub services: Services,
     pub ui: UiState,
@@ -233,6 +235,7 @@ impl SlideApp {
     pub fn new(session: Session, mut services: Services) -> Self {
         let audio_out = services.audio_out.take();
         SlideApp {
+            table_pen: serde_json::json!({"width": 1.0}),
             session,
             services,
             ui: UiState::default(),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..2982a6f0 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2224,6 +2224,53 @@ fn table_design(app: &mut SlideApp, ui: &mut Ui) {
             }
         });
     });
+    group(ui, |ui| {
+        let r = big_button(ui, Icon::Borders, "Borders", true);
+        egui::Popup::menu(&r).show(|ui| {
+            let pen = app.table_pen.clone();
+            for (label, which) in [
+                ("No Border", "none"),
+                ("All Borders", "all"),
+                ("Outside Borders", "outside"),
+                ("Inside Borders", "inside"),
+                ("Top Border", "top"),
+                ("Bottom Border", "bottom"),
+                ("Left Border", "left"),
+                ("Right Border", "right"),
+                ("Inside Horizontal Border", "insideH"),
+                ("Inside Vertical Border", "insideV"),
+                ("Diagonal Down Border", "diagDown"),
+                ("Diagonal Up Border", "diagUp"),
+            ] {
+                let mut p = pen.clone();
+                p["which"] = json!(which);
+                menu_item(app, ui, Icon::Borders, label, "table.borders", p);
+            }
+            ui.separator();
+            ui.menu_button("Pen Weight", |ui| {
+                for w in [0.25, 0.5, 0.75, 1.0, 1.5, 2.25, 3.0, 4.5, 6.0] {
+                    let cur = app.table_pen.get("width").and_then(Value::as_f64) == Some(w);
+                    if ui.radio(cur, format!("{w} pt")).clicked() {
+                        app.table_pen["width"] = json!(w);
+                    }
+                }
+            });
+            ui.menu_button("Pen Style", |ui| {
+                for (l, d) in [("Solid", "solid"), ("Dash", "dash"), ("Dot", "sysDot"), ("Dash Dot", "dashDot"), ("Long Dash", "lgDash")] {
+                    let cur = app.table_pen.get("dash").and_then(Value::as_str).unwrap_or("solid") == d;
+                    if ui.radio(cur, l).clicked() {
+                        app.table_pen["dash"] = json!(d);
+                    }
+                }
+            });
+            ui.menu_button("Pen Color", |ui| {
+                let sc = scheme(app);
+                if let Some(Some(c)) = widgets::color_grid(ui, &sc, None) {
+                    app.table_pen["color"] = cref_param(&c);
+                }
+            });
+        });
+    });
 }
 
 pub fn paint_table_style(p: &egui::Painter, r: Rect, id: &str, sc: &deckcraft_color::ColorScheme) {
@@ -2290,10 +2337,18 @@ fn table_layout(app: &mut SlideApp, ui: &mut Ui) {
             });
             ui.horizontal(|ui| {
                 for (l, a) in [("Top", "top"), ("Center", "middle"), ("Bottom", "bottom")] {
-                    if ui.small_button(l).clicked() {
-                        run(app, "format.anchor", json!({"anchor": a}));
+                    if ui.small_button(l).on_hover_text(format!("Align text to the {l} of the cell").to_lowercase()).clicked() {
+                        run(app, "table.cellAlign", json!({"anchor": a}));
                     }
                 }
+                ui.menu_button("Cell Margins", |ui| {
+                    for (l, preset) in [("Normal", "normal"), ("None", "none"), ("Narrow", "narrow"), ("Wide", "wide")] {
+                        if ui.button(l).clicked() {
+                            run(app, "table.cellMargins", json!({"preset": preset}));
+                            ui.close();
+                        }
+                    }
+                });
             });
         });
     });
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..043d2b7b 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -3,12 +3,12 @@
 > **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 79%** over 191 features.
+**Weighted breadth parity: 80%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
+| P1 | 65 | 39 | 20 | 6 | 75% |
 | P2 | 54 | 13 | 15 | 26 | 38% |
 
 | Area | Parity |
@@ -22,7 +22,7 @@ The summary between `<!-- SUMMARY -->
 | Format | 83% |
 | Arrange | 100% |
 | Text | 80% |
-| Tables | 89% |
+| Tables | 95% |
 | Charts | 65% |
 | SmartArt | 33% |
 | Pictures | 48% |
@@ -169,7 +169,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Tables | Insert/delete rows and columns | P0 | D |
 | Tables | Merge and split cells | P1 | D |
 | Tables | Distribute rows/columns, sizes | P1 | D |
-| Tables | Cell fill, borders, margins, alignment | P1 | P |
+| Tables | Cell fill, borders, margins, alignment | P1 | D |
 | Tables | Keyboard navigation between cells | P0 | D |
 | Charts | Insert chart (column, bar, line, area, pie, doughnut, scatter) | P0 | D |
 | Charts | Other chart types (radar, stock, combo, waterfall, funnel, treemap, sunburst, histogram, box) | P2 | P |

From c22747b104e062b1ca75dd8120165f427ed12e2c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:22:19 +0300
Subject: [PATCH 175/376] Morph: the same text moves and resizes instead of
 cross-fading

A title typed as "TEST" on a title slide and on a content slide pairs
the two titles, but they differ in placeholder, size and alignment, so
Morph with the default Objects option cross-faded them: the old title
rose and faded out while the new one faded in.

Paired shapes whose text is the same now use the word morph (shared
words travel and resize from their old place to their new one) whatever
the Morph option, as PowerPoint does. Different texts still cross-fade
with Objects.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/anim/src/morph.rs |  6 +++++-
 crates/anim/src/tests.rs | 27 +++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/crates/anim/src/morph.rs b/crates/anim/src/morph.rs
index b5808c4f..a05f2d6c 100644
--- a/crates/anim/src/morph.rs
+++ b/crates/anim/src/morph.rs
@@ -237,7 +237,11 @@ pub fn morph_frame(pres: &Presentation, a: &Slide, b: &Slide, t: f64, hidden_b:
         } else {
             let new = push(Shape { xfrm: x, ..sb.clone() }, false, s);
             let old = push(Shape { xfrm: x, ..sa.clone() }, true, 1.0 - s);
-            if by_text
+            // The same text in shapes that differ otherwise (a title slide's centred title and a
+            // content slide's title: other placeholder, size, alignment) moves and resizes word
+            // by word even with the Objects option, as PowerPoint does, instead of cross-fading.
+            let same_text = text_of(sa).trim() == text_of(sb).trim();
+            if (by_text || same_text)
                 && has_text(sa)
                 && has_text(sb)
                 && let (Some(from), Some(to)) = (box_of(ca.as_ref(), sa), box_of(cb.as_ref(), sb))
diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..558178d6 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -789,3 +789,30 @@ fn show_follows_links() {
     assert_eq!(s.follow(&p, &Action::LastViewed, None), LinkJump::None);
     assert_eq!(s.slide, 3);
 }
+
+/// #316: the same text in two shapes that differ otherwise (a title slide's big centred title,
+/// a content slide's title) morphs word by word with the default Objects option, instead of
+/// the old box cross-fading into the new one.
+#[test]
+fn same_text_morphs_even_by_objects() {
+    let p = deckcraft_model::defaults::new_presentation(None);
+    let titled = |id, x, size: f64, text: &str| {
+        let mut body = TextBody::from_text(text);
+        for para in &mut body.paragraphs {
+            for r in &mut para.runs {
+                r.props.size = Some(size);
+            }
+        }
+        Shape { xfrm: Some(Xfrm::new(x, 100.0, 600.0, 120.0)), text: Some(body), ..shape(id, "Title 1") }
+    };
+    let mut a = Slide::default();
+    let mut b = Slide::default();
+    a.shapes = vec![titled(1, 100.0, 60.0, "TEST")];
+    b.shapes = vec![titled(2, 40.0, 44.0, "TEST")];
+    let f = morph_frame(&p, &a, &b, 0.5, &|_| false);
+    assert_eq!(f.text.len(), 1, "the shared text morphs");
+    assert!(!f.text[0].chars);
+    // Different texts still cross-fade with the Objects option.
+    b.shapes = vec![titled(2, 40.0, 44.0, "Other")];
+    assert!(morph_frame(&p, &a, &b, 0.5, &|_| false).text.is_empty());
+}

From 5a060c8b48c9f1594bffb2c36611f0e7fbb11c15 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:22:31 +0300
Subject: [PATCH 176/376] Design: Variants gallery with four colour variations
 of the theme

PowerPoint's Design tab shows the current theme in four variants. The
Variants group had only the Colors and Fonts menus. theme_variants builds
four colour schemes from the theme's built-in colours (as designed, two
accent rotations, and a dark variant with light and dark swapped), so
switching between variants doesn't drift. design.variant applies one to
the master; design.variants reports them and which is applied. The
Design tab shows them as a gallery before Colors and Fonts.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/design.rs | 28 ++++++++++++++++++++++++++++
 crates/engine/src/tests.rs      | 28 ++++++++++++++++++++++++++++
 crates/model/src/theme.rs       | 25 +++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs    | 23 +++++++++++++++++++++++
 docs/parity-checklist.md        |  8 ++++----
 5 files changed, 108 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..8f7381b8 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -17,6 +17,8 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("design.theme", "Themes", ["Design", "Themes"], None, "{name} (see design.themes)", has_doc, theme),
         cmd!(query "design.themes", "Theme Gallery", [], None, "{} → themes, colour schemes and font schemes", always, themes),
         cmd!("design.colors", "Colors", ["Design", "Variants"], None, "{name} | {colors: {accent1: #RRGGBB, …}}", has_doc, colors),
+        cmd!("design.variant", "Variants", ["Design", "Variants"], None, "{index: 0..3} (see design.variants)", has_doc, variant),
+        cmd!(query "design.variants", "Variant Gallery", [], None, "{} → the current theme's four colour variants and which is applied", has_doc, variants),
         cmd!("design.fonts", "Fonts", ["Design", "Variants"], None, "{name} | {major, minor}", has_doc, fonts),
         cmd!(
             "design.background",
@@ -125,6 +127,32 @@ fn colors(s: &mut Session, p: &Value) -> Result<Value> {
     ok()
 }
 
+fn variant(s: &mut Session, p: &Value) -> Result<Value> {
+    let index = p.get("index").and_then(Value::as_u64).ok_or_else(|| bad("design.variant", "missing `index` (0..3)"))? as usize;
+    s.edit(|doc, sel| {
+        let mi = master_index(doc, sel);
+        let m = Arc::make_mut(doc.masters.get_mut(mi).ok_or_else(|| bad("design.variant", "no master"))?);
+        let v = deckcraft_model::theme::theme_variants(&m.theme);
+        m.theme.colors =
+            v.get(index).cloned().ok_or_else(|| bad("design.variant", format!("no variant {index}; 0..{}", v.len().saturating_sub(1))))?;
+        Ok(())
+    })?;
+    Ok(json!({"variant": index}))
+}
+
+fn variants(s: &mut Session, _p: &Value) -> Result<Value> {
+    let st = s.doc()?;
+    let mi = master_index(&st.doc, &st.selection);
+    let th = st.doc.masters.get(mi).map(|m| m.theme.clone()).unwrap_or_default();
+    let v = deckcraft_model::theme::theme_variants(&th);
+    let current = v.iter().position(|c| c.colors == th.colors.colors);
+    Ok(json!({
+        "theme": th.name,
+        "current": current,
+        "variants": v.iter().map(|c| json!({"name": c.name, "colors": c.colors.iter().map(|x| format!("#{}", x.hex())).collect::<Vec<_>>()})).collect::<Vec<_>>(),
+    }))
+}
+
 fn fonts(s: &mut Session, p: &Value) -> Result<Value> {
     let scheme = if let Some(name) = str_param(p, "name") {
         builtin_font_schemes()
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..ceb97c26 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,31 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn theme_variants_apply_and_report_the_current_one() {
+    let mut s = session();
+    let name = deckcraft_model::theme::builtin_themes()[1].name.clone();
+    s.execute("design.theme", &json!({"name": name})).unwrap();
+    let v = s.execute("design.variants", &json!({})).unwrap();
+    assert_eq!(v["variants"].as_array().unwrap().len(), 4);
+    assert_eq!(v["current"], json!(0));
+    let base = s.doc().unwrap().doc.masters[0].theme.colors.clone();
+    s.execute("design.variant", &json!({"index": 1})).unwrap();
+    let c = s.doc().unwrap().doc.masters[0].theme.colors.clone();
+    assert_eq!(c.colors[4], base.colors[5], "accents rotate");
+    assert_eq!(c.colors[0], base.colors[0]);
+    assert_eq!(s.execute("design.variants", &json!({})).unwrap()["current"], json!(1));
+    // From a variant, another variant is built from the theme's own colours, not the variant's.
+    s.execute("design.variant", &json!({"index": 3})).unwrap();
+    let d = s.doc().unwrap().doc.masters[0].theme.colors.clone();
+    assert_eq!((d.colors[0], d.colors[1], d.colors[4]), (base.colors[1], base.colors[0], base.colors[4]));
+    s.execute("design.variant", &json!({"index": 0})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.masters[0].theme.colors.colors, base.colors);
+    assert!(s.execute("design.variant", &json!({"index": 9})).is_err());
+    // It survives PPTX.
+    s.execute("design.variant", &json!({"index": 2})).unwrap();
+    let p = s.doc().unwrap().doc.as_ref().clone();
+    let back = deckcraft_pptx::import(&deckcraft_pptx::export(&p).unwrap()).unwrap();
+    assert_eq!(back.masters[0].theme.colors.colors, p.masters[0].theme.colors.colors);
+}
diff --git a/crates/model/src/theme.rs b/crates/model/src/theme.rs
index 582f0728..d25b99bb 100644
--- a/crates/model/src/theme.rs
+++ b/crates/model/src/theme.rs
@@ -150,6 +150,31 @@ pub fn default_format() -> FormatScheme {
 }
 
 /// Our original built-in themes (shown in Design ▸ Themes). Colours and names are our own.
+/// Design ▸ Variants: four colour variations of `t`, built from its built-in colours when it is
+/// a built-in theme (so picking one variant after another doesn't drift), else from its own.
+/// 1: as designed; 2 and 3: the accents rotated; 4: dark (light and dark colours swapped).
+pub fn theme_variants(t: &Theme) -> Vec<ColorScheme> {
+    let base = builtin_themes().into_iter().find(|b| b.name == t.name).map_or_else(|| t.colors.clone(), |b| b.colors);
+    let rotate = |by: usize| {
+        let mut c = base.clone();
+        let accents: Vec<_> = base.colors.get(4..10).map(<[_]>::to_vec).unwrap_or_default();
+        for (i, slot) in c.colors.iter_mut().skip(4).take(6).enumerate() {
+            if let Some(a) = accents.get((i + by) % accents.len().max(1)) {
+                *slot = *a;
+            }
+        }
+        c
+    };
+    let mut dark = base.clone();
+    dark.colors.swap(0, 1);
+    dark.colors.swap(2, 3);
+    let mut out = vec![base.clone(), rotate(1), rotate(3), dark];
+    for (i, c) in out.iter_mut().enumerate().skip(1) {
+        c.name = format!("{} {}", base.name, i + 1);
+    }
+    out
+}
+
 pub fn builtin_themes() -> Vec<Theme> {
     let t = |name: &str, colors: ColorScheme, major: &str, minor: &str| Theme {
         name: name.into(),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..36cf72d3 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1233,6 +1233,29 @@ fn design(app: &mut SlideApp, ui: &mut Ui) {
             run(app, "design.theme", json!({"name": n}));
         }
     });
+    // Variants: the current theme in its four colour variations.
+    if let Some(th) = app.session.active().and_then(|d| d.doc.masters.first().map(|m| m.theme.clone())) {
+        let variants = deckcraft_model::theme::theme_variants(&th);
+        let tiles: Vec<deckcraft_model::Theme> = variants.iter().map(|c| deckcraft_model::Theme { colors: c.clone(), ..th.clone() }).collect();
+        let names: Vec<String> = variants.iter().map(|c| c.name.clone()).collect();
+        let sel = variants.iter().position(|c| c.colors == th.colors.colors);
+        group(ui, |ui| {
+            if let Some(i) = widgets::gallery(
+                ui,
+                tiles.len(),
+                vec2(84.0, 56.0),
+                sel,
+                |p, r, i| {
+                    if let Some(t) = tiles.get(i) {
+                        paint_theme_tile(p, r, t);
+                    }
+                },
+                |i| names.get(i).cloned().unwrap_or_default(),
+            ) {
+                run(app, "design.variant", json!({"index": i}));
+            }
+        });
+    }
     group(ui, |ui| {
         let r = big_button(ui, Icon::Colors, "Colors", true);
         egui::Popup::menu(&r).width(240.0).show(|ui| {
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..ef8068b5 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -3,12 +3,12 @@
 > **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 79%** over 191 features.
+**Weighted breadth parity: 80%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
+| P1 | 65 | 39 | 20 | 6 | 75% |
 | P2 | 54 | 13 | 15 | 26 | 38% |
 
 | Area | Parity |
@@ -17,7 +17,7 @@ The summary between `<!-- SUMMARY -->
 | Files | 71% |
 | Slides | 90% |
 | Views | 90% |
-| Masters & themes | 85% |
+| Masters & themes | 88% |
 | Shapes | 88% |
 | Format | 83% |
 | Arrange | 100% |
@@ -94,7 +94,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Masters & themes | Insert/rename/delete layouts, insert placeholders | P1 | D |
 | Masters & themes | Handout and Notes masters | P2 | M |
 | Masters & themes | Built-in themes (original designs) | P0 | D |
-| Masters & themes | Theme variants | P1 | P |
+| Masters & themes | Theme variants | P1 | D |
 | Masters & themes | Colour schemes (built-in and custom) | P0 | D |
 | Masters & themes | Font schemes (built-in and custom) | P0 | D |
 | Masters & themes | Effect schemes / background styles | P2 | P |

From 427a955c066d19ad417679e7c80035d9c44e372c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:26:51 +0300
Subject: [PATCH 177/376] Tables: Draw Table pencil and Table Eraser

Insert > Table > Draw Table turns on a table pencil. Dragging a box on an
empty part of the slide makes a one-cell table. Drawing a line inside a
table splits the cells it crosses, across or down, and adds a row or
column only where needed, so the cells it doesn't cross stay whole.
Table Design > Draw Borders has the pencil and a Table Eraser. A click
on a border merges the two cells on either side when together they
form a rectangle, and their text is kept.

The new table.drawLine and table.eraseLine commands are each one undo
step. The grid work is pure (engine/src/drawtable.rs). It rebuilds the
table from its anchor cells, so existing merges survive, and it caps
the grid at 200 rows and columns. Ribbon big buttons now carry an
accessibility label.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/table.rs        |  56 ++++++
 crates/engine/src/drawtable.rs        | 276 ++++++++++++++++++++++++++
 crates/engine/src/lib.rs              |   1 +
 crates/engine/src/tools.rs            |  28 ++-
 crates/ui-egui/src/canvas.rs          |  10 +
 crates/ui-egui/src/drawtable_tests.rs |  84 ++++++++
 crates/ui-egui/src/ribbon.rs          |  20 ++
 crates/ui-egui/src/widgets.rs         |   3 +
 docs/parity-checklist.md              |   6 +-
 9 files changed, 480 insertions(+), 4 deletions(-)
 create mode 100644 crates/engine/src/drawtable.rs
 create mode 100644 crates/ui-egui/src/drawtable_tests.rs

diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index e9f6f164..17f3bbc9 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -61,6 +61,24 @@ pub fn specs() -> Vec<CommandSpec> {
         )),
         cmd!("table.columnWidth", "Width", ["Table Layout", "Cell Size"], None, "{col, width: pt, id?}", has_selection, column_width),
         cmd!("table.rowHeight", "Height", ["Table Layout", "Cell Size"], None, "{row, height: pt, id?}", has_selection, row_height),
+        cmd!(
+            "table.drawLine",
+            "Draw Table",
+            ["Table Design", "Draw Borders"],
+            None,
+            "{from: [x, y], to: [x, y] slide pt, id?: table (default: the one under `from`)} splits the cells the line crosses",
+            has_slide,
+            draw_line
+        ),
+        cmd!(
+            "table.eraseLine",
+            "Table Eraser",
+            ["Table Design", "Draw Borders"],
+            None,
+            "{at: [x, y] slide pt, id?, tol?: pt (default 6)} merges the two cells on either side of the nearest border",
+            has_slide,
+            erase_line
+        ),
         cmd!(noundo "table.selectCells", "Select Cells", [], None, "{from: [r,c], to: [r,c], id?}", has_selection, select_cells),
     ]
 }
@@ -266,3 +284,41 @@ fn select_cells(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     ok()
 }
+
+fn point_param(p: &Value, key: &str) -> Option<(f64, f64)> {
+    let a = p.get(key)?;
+    let (x, y) = (a.get(0)?.as_f64()?, a.get(1)?.as_f64()?);
+    (x.is_finite() && y.is_finite()).then_some((x, y))
+}
+
+/// The table under slide point `at` (frontmost), or the one named by `id`, with its origin.
+pub(crate) fn table_at(s: &Session, p: &Value, at: (f64, f64)) -> Option<(deckcraft_model::ShapeId, (f64, f64))> {
+    let st = s.doc().ok()?;
+    let want = id_param(p, "id");
+    st.shapes().iter().rev().find_map(|sh| {
+        let x = sh.xfrm?;
+        let ShapeKind::Table(t) = &sh.kind else { return None };
+        let inside = at.0 >= x.x && at.1 >= x.y && at.0 <= x.x + t.width() && at.1 <= x.y + t.height();
+        (want.map_or(inside, |w| w == sh.id)).then_some((sh.id, (x.x, x.y)))
+    })
+}
+
+fn draw_line(s: &mut Session, p: &Value) -> Result<Value> {
+    let from = point_param(p, "from").ok_or_else(|| bad("table.drawLine", "missing `from`"))?;
+    let to = point_param(p, "to").ok_or_else(|| bad("table.drawLine", "missing `to`"))?;
+    let (id, o) = table_at(s, p, from).ok_or_else(|| bad("table.drawLine", "no table there"))?;
+    let (a, b) = ((from.0 - o.0, from.1 - o.1), (to.0 - o.0, to.1 - o.1));
+    with_table(s, &json!({"id": id.0}), "table.drawLine", move |t| {
+        if crate::drawtable::draw_line(t, a, b) { Ok(()) } else { Err(bad("table.drawLine", "the line doesn't divide any cell")) }
+    })
+}
+
+fn erase_line(s: &mut Session, p: &Value) -> Result<Value> {
+    let at = point_param(p, "at").ok_or_else(|| bad("table.eraseLine", "missing `at`"))?;
+    let tol = p.get("tol").and_then(Value::as_f64).filter(|v| v.is_finite()).unwrap_or(6.0).clamp(0.5, 50.0);
+    let (id, o) = table_at(s, p, at).ok_or_else(|| bad("table.eraseLine", "no table there"))?;
+    let q = (at.0 - o.0, at.1 - o.1);
+    with_table(s, &json!({"id": id.0}), "table.eraseLine", move |t| {
+        if crate::drawtable::erase_at(t, q, tol) { Ok(()) } else { Err(bad("table.eraseLine", "no border to erase there")) }
+    })
+}
diff --git a/crates/engine/src/drawtable.rs b/crates/engine/src/drawtable.rs
new file mode 100644
index 00000000..2b49b7ac
--- /dev/null
+++ b/crates/engine/src/drawtable.rs
@@ -0,0 +1,276 @@
+//! Draw Table: the pencil splits cells along the line you draw, the table eraser merges the two
+//! cells on either side of the border you click. Pure operations on a [`Table`] in its own
+//! coordinates (points from its top-left corner), unit-tested without a session.
+//!
+//! Both work on the table's *anchors* (each visible cell with its row and column span), edit
+//! that list, then lay the grid back out, so merges anywhere in the table survive.
+
+use deckcraft_model::table::{Cell, Table};
+
+/// A line closer than this to an existing grid line reuses it rather than adding a sliver.
+const SNAP: f64 = 4.0;
+/// Cap on the grid so a runaway pencil can't build an enormous table.
+const MAX_GRID: usize = 200;
+
+#[derive(Clone, Debug)]
+struct Anchor {
+    r: usize,
+    c: usize,
+    rs: usize,
+    cs: usize,
+    cell: Cell,
+}
+
+fn anchors(t: &Table) -> Vec<Anchor> {
+    let mut v = vec![];
+    for (r, row) in t.rows.iter().enumerate() {
+        for (c, cell) in row.cells.iter().enumerate() {
+            if !cell.is_covered() {
+                let rs = (cell.row_span.max(1) as usize).min(t.rows.len().saturating_sub(r)).max(1);
+                let cs = (cell.grid_span.max(1) as usize).min(t.cols.len().saturating_sub(c)).max(1);
+                v.push(Anchor { r, c, rs, cs, cell: cell.clone() });
+            }
+        }
+    }
+    v
+}
+
+/// Lay `anchors` out into `t`'s grid (its rows and columns already sized).
+fn rebuild(t: &mut Table, anchors: Vec<Anchor>) {
+    let (nr, nc) = (t.rows.len(), t.cols.len());
+    for row in &mut t.rows {
+        row.cells = (0..nc).map(|_| Cell::new("")).collect();
+    }
+    for a in anchors {
+        for r in a.r..(a.r + a.rs).min(nr) {
+            for c in a.c..(a.c + a.cs).min(nc) {
+                if let Some(x) = t.cell_mut(r, c) {
+                    x.h_merge = c > a.c;
+                    x.v_merge = r > a.r;
+                }
+            }
+        }
+        if let Some(x) = t.cell_mut(a.r, a.c) {
+            *x = Cell { grid_span: a.cs as u32, row_span: a.rs as u32, h_merge: false, v_merge: false, ..a.cell };
+        }
+    }
+    t.normalize();
+}
+
+/// Swap rows and columns, so the vertical case reuses the horizontal one.
+fn transpose(t: &mut Table) {
+    let (nr, nc) = (t.rows.len(), t.cols.len());
+    let heights: Vec<f64> = t.rows.iter().map(|r| r.height).collect();
+    let mut a = anchors(t);
+    for x in &mut a {
+        std::mem::swap(&mut x.r, &mut x.c);
+        std::mem::swap(&mut x.rs, &mut x.cs);
+        let [l, r, tp, b] = std::mem::take(&mut x.cell.borders);
+        x.cell.borders = [tp, b, l, r];
+    }
+    let widths = std::mem::take(&mut t.cols);
+    t.cols = heights;
+    t.rows = widths.into_iter().map(|h| deckcraft_model::table::Row { height: h, cells: vec![] }).collect();
+    debug_assert_eq!((t.rows.len(), t.cols.len()), (nc, nr));
+    rebuild(t, a);
+}
+
+fn edges(sizes: impl Iterator<Item = f64>) -> Vec<f64> {
+    let mut e = vec![0.0];
+    let mut acc = 0.0;
+    for s in sizes {
+        acc += s;
+        e.push(acc);
+    }
+    e
+}
+
+/// Draw a line from `a` to `b` (table points). Mostly-horizontal lines split rows, mostly-vertical
+/// ones split columns; only the cells the line crosses are divided. Returns whether anything
+/// changed.
+pub fn draw_line(t: &mut Table, a: (f64, f64), b: (f64, f64)) -> bool {
+    if ![a.0, a.1, b.0, b.1].iter().all(|v| v.is_finite()) || t.rows.is_empty() || t.cols.is_empty() {
+        return false;
+    }
+    if (b.0 - a.0).abs() >= (b.1 - a.1).abs() {
+        split_rows(t, (a.1 + b.1) / 2.0, a.0.min(b.0), a.0.max(b.0))
+    } else {
+        transpose(t);
+        let changed = split_rows(t, (a.0 + b.0) / 2.0, a.1.min(b.1), a.1.max(b.1));
+        transpose(t);
+        changed
+    }
+}
+
+/// A horizontal line at `y` from `x0` to `x1`.
+fn split_rows(t: &mut Table, y: f64, x0: f64, x1: f64) -> bool {
+    let ys = edges(t.rows.iter().map(|r| r.height));
+    let xs = edges(t.cols.iter().copied());
+    let total = ys.last().copied().unwrap_or(0.0);
+    if y <= SNAP || y >= total - SNAP || x1 - x0 < SNAP {
+        return false;
+    }
+    let mut a = anchors(t);
+    // Boundary index b: an existing grid line near y, or a new one splitting row k.
+    let b = match ys.iter().position(|e| (e - y).abs() <= SNAP) {
+        Some(b) => b,
+        None => {
+            if t.rows.len() >= MAX_GRID {
+                return false;
+            }
+            let Some(k) = ys.windows(2).position(|w| w[0] < y && y < w[1]) else { return false };
+            let top = ys[k];
+            let (h0, h1) = (y - top, ys[k + 1] - y);
+            if let Some(r) = t.rows.get_mut(k) {
+                r.height = h0;
+            }
+            t.rows.insert(k + 1, deckcraft_model::table::Row { height: h1, cells: vec![] });
+            for x in &mut a {
+                if x.r > k {
+                    x.r += 1;
+                } else if x.r + x.rs > k {
+                    x.rs += 1;
+                }
+            }
+            k + 1
+        }
+    };
+    let mut changed = false;
+    let mut out = Vec::with_capacity(a.len() + 4);
+    for x in a {
+        let (l, r) = (xs.get(x.c).copied().unwrap_or(0.0), xs.get(x.c + x.cs).copied().unwrap_or(0.0));
+        // The line divides a cell it crosses for more than half of the cell's width.
+        let overlap = (r.min(x1) - l.max(x0)).max(0.0);
+        if x.r < b && b < x.r + x.rs && overlap * 2.0 > r - l {
+            let below =
+                Anchor { r: b, c: x.c, rs: x.r + x.rs - b, cs: x.cs, cell: Cell { text: deckcraft_model::TextBody::default(), ..x.cell.clone() } };
+            out.push(Anchor { rs: b - x.r, ..x });
+            out.push(below);
+            changed = true;
+        } else {
+            out.push(x);
+        }
+    }
+    rebuild(t, out);
+    changed
+}
+
+/// Erase the border nearest `p` (within `tol` points): the two cells it separates merge, when
+/// together they make a rectangle. Returns whether a border was erased.
+pub fn erase_at(t: &mut Table, p: (f64, f64), tol: f64) -> bool {
+    if !(p.0.is_finite() && p.1.is_finite()) {
+        return false;
+    }
+    let ys = edges(t.rows.iter().map(|r| r.height));
+    let xs = edges(t.cols.iter().copied());
+    let a = anchors(t);
+    let rect = |x: &Anchor| (xs[x.c], ys[x.r], xs[x.c + x.cs], ys[x.r + x.rs]);
+    let mut best: Option<(f64, usize, usize)> = None;
+    for (i, u) in a.iter().enumerate() {
+        for (j, v) in a.iter().enumerate() {
+            let (ul, ut, ur, ub) = rect(u);
+            // v directly right of u with the same rows, or directly below with the same columns.
+            let d = if v.c == u.c + u.cs && v.r == u.r && v.rs == u.rs && p.1 > ut && p.1 < ub {
+                (p.0 - ur).abs()
+            } else if v.r == u.r + u.rs && v.c == u.c && v.cs == u.cs && p.0 > ul && p.0 < ur {
+                (p.1 - ub).abs()
+            } else {
+                continue;
+            };
+            if d <= tol && best.is_none_or(|b| d < b.0) {
+                best = Some((d, i, j));
+            }
+        }
+    }
+    let Some((_, i, j)) = best else { return false };
+    let mut a = a;
+    let v = a[j].clone();
+    let u = &mut a[i];
+    if v.r == u.r {
+        u.cs += v.cs;
+    } else {
+        u.rs += v.rs;
+    }
+    let mut more = v.cell.text.paragraphs.clone();
+    if !v.cell.text.is_empty() {
+        if u.cell.text.is_empty() {
+            u.cell.text.paragraphs = more;
+        } else {
+            u.cell.text.paragraphs.append(&mut more);
+        }
+    }
+    a.remove(j);
+    rebuild(t, a);
+    true
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn grid(t: &Table) -> String {
+        t.rows
+            .iter()
+            .map(|r| {
+                r.cells
+                    .iter()
+                    .map(|c| {
+                        if c.is_covered() {
+                            "."
+                        } else if c.grid_span > 1 || c.row_span > 1 {
+                            "M"
+                        } else {
+                            "o"
+                        }
+                    })
+                    .collect::<String>()
+            })
+            .collect::<Vec<_>>()
+            .join("/")
+    }
+
+    #[test]
+    fn pencil_splits_only_the_cells_it_crosses() {
+        let mut t = Table::new(1, 1, 300.0, 100.0);
+        assert!(draw_line(&mut t, (0.0, 40.0), (300.0, 40.0)), "full-width line adds a row");
+        assert_eq!((grid(&t), t.rows[0].height, t.rows[1].height), ("o/o".into(), 40.0, 60.0));
+        assert!(draw_line(&mut t, (120.0, 40.0), (120.0, 100.0)), "a vertical line in the bottom row only");
+        assert_eq!(grid(&t), "M./oo");
+        assert_eq!(t.cols, vec![120.0, 180.0]);
+        assert!(draw_line(&mut t, (120.0, 0.0), (120.0, 40.0)), "on the existing grid line: splits the merged top cell");
+        assert_eq!(grid(&t), "oo/oo");
+        assert!(!draw_line(&mut t, (0.0, 1.0), (300.0, 1.0)), "on the outer border");
+        assert!(!draw_line(&mut t, (f64::NAN, 1.0), (300.0, 1.0)));
+        assert_eq!(t.width(), 300.0);
+        assert_eq!(t.height(), 100.0);
+    }
+
+    #[test]
+    fn eraser_merges_neighbours_and_keeps_text() {
+        let mut t = Table::new(2, 2, 200.0, 50.0);
+        t.cell_mut(0, 0).unwrap().text = Cell::new("A").text;
+        t.cell_mut(0, 1).unwrap().text = Cell::new("B").text;
+        assert!(erase_at(&mut t, (100.0, 25.0), 5.0), "the vertical border in row 0");
+        assert_eq!(grid(&t), "M./oo");
+        assert_eq!(t.cell(0, 0).unwrap().text.paragraphs.len(), 2);
+        assert!(!erase_at(&mut t, (50.0, 75.0), 5.0), "nowhere near a border");
+        let mut t = Table::new(2, 2, 200.0, 50.0);
+        t.merge(0, 0, 0, 1);
+        assert!(!erase_at(&mut t, (50.0, 50.0), 3.0), "the merged top cell and one bottom cell aren't a rectangle");
+        assert!(erase_at(&mut t, (100.0, 75.0), 3.0));
+        assert!(erase_at(&mut t, (50.0, 50.0), 3.0));
+        assert_eq!(grid(&t), "M./..");
+    }
+
+    #[test]
+    fn grid_is_capped() {
+        let mut t = Table::new(1, 1, 300.0, 4000.0);
+        let mut n = 0;
+        for i in 1..400 {
+            if draw_line(&mut t, (0.0, i as f64 * 9.9), (300.0, i as f64 * 9.9)) {
+                n += 1;
+            }
+        }
+        assert!(t.rows.len() <= MAX_GRID && n > 100, "{} rows", t.rows.len());
+    }
+}
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..cbff1848 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -9,6 +9,7 @@
 
 pub mod cmd;
 pub mod connect;
+pub mod drawtable;
 pub mod fonts;
 pub mod guard;
 pub mod keys;
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..4847c601 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -144,6 +144,10 @@ enum Drag {
 /// Shape-gallery names that draw a freeform path instead of a preset.
 pub const FREEFORM_TOOLS: [(&str, &str); 3] = [("curve", "Curve"), ("freeform", "Freeform: Shape"), ("scribble", "Freeform: Scribble")];
 
+/// Draw Table's pencil and eraser, as `ToolKind::Shape` presets (Insert › Table › Draw Table).
+pub const DRAW_TABLE: &str = "drawTable";
+pub const TABLE_ERASER: &str = "tableEraser";
+
 pub fn is_freeform_tool(name: &str) -> bool {
     FREEFORM_TOOLS.iter().any(|f| f.0 == name)
 }
@@ -346,6 +350,10 @@ impl Session {
                 self.tool.path_closing = false;
                 return Ok(Value::Null);
             }
+            ToolKind::Shape { preset } if preset == TABLE_ERASER => {
+                // Click a border to merge the cells on either side; elsewhere does nothing.
+                return Ok(self.execute("table.eraseLine", &json!({"at": [p.x, p.y], "tol": tol.max(4.0)})).unwrap_or(Value::Null));
+            }
             ToolKind::Shape { .. } | ToolKind::TextBox => {
                 self.tool.drag = Some(Drag::Create { start: p });
                 self.tool.preview = Some(Xfrm::new(p.x, p.y, 0.0, 0.0));
@@ -613,6 +621,13 @@ impl Session {
                     }
                     let s0 = self.glue_at(start, tol).map(|g| g.2).unwrap_or(start);
                     line_xfrm(s0, q, 0.0)
+                } else if matches!(&self.tool.kind, ToolKind::Shape { preset } if preset == DRAW_TABLE)
+                    && crate::cmd::table::table_at(self, &Value::Null, (start.x, start.y)).is_some()
+                {
+                    // The pencil inside a table draws a straight border, across or down.
+                    let q = if (p.x - start.x).abs() >= (p.y - start.y).abs() { Point::new(p.x, start.y) } else { Point::new(start.x, p.y) };
+                    let r = Rect::from_points(start, q);
+                    Xfrm::new(r.x0, r.y0, r.width(), r.height())
                 } else {
                     let mut r = Rect::from_points(start, p);
                     if mods.shift {
@@ -708,6 +723,16 @@ impl Session {
                 let preview = self.tool.preview.take();
                 let dragged = (p - start).hypot() > 2.0;
                 let res = match &kind {
+                    ToolKind::Shape { preset } if preset == DRAW_TABLE => {
+                        // Inside a table: split cells along the line. Elsewhere: a one-cell table.
+                        if crate::cmd::table::table_at(self, &Value::Null, (start.x, start.y)).is_some() {
+                            self.execute("table.drawLine", &json!({"from": [start.x, start.y], "to": [p.x, p.y]})).unwrap_or(Value::Null)
+                        } else if let Some(x) = preview.filter(|x| dragged && x.w >= 8.0 && x.h >= 8.0) {
+                            self.execute("insert.table", &json!({"rows": 1, "cols": 1, "rect": [x.x, x.y, x.w, x.h]}))?
+                        } else {
+                            Value::Null
+                        }
+                    }
                     ToolKind::Shape { preset } => {
                         let line = deckcraft_geom::preset::is_line_like(preset);
                         let rect = match preview.filter(|_| dragged) {
@@ -741,7 +766,8 @@ impl Session {
                     }
                     _ => Value::Null,
                 };
-                if !self.tool.sticky {
+                // The table pencil stays on until you pick another tool, as in PowerPoint.
+                if !self.tool.sticky && !matches!(&kind, ToolKind::Shape { preset } if preset == DRAW_TABLE) {
                     self.tool.kind = ToolKind::Select;
                 }
                 out = res;
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..46f6dd5f 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -608,6 +608,16 @@ fn draw_preview(app: &SlideApp, p: &egui::Painter, xf: Xf, x: Xfrm, t: &Tokens)
         ToolKind::Shape { preset } => preset.clone(),
         _ => "rect".into(),
     };
+    if preset == deckcraft_engine::tools::DRAW_TABLE {
+        // A border inside a table (flat), or the outline of a new table.
+        let (a, b) = (xf.to_screen(Point::new(x.x, x.y)), xf.to_screen(Point::new(x.x + x.w, x.y + x.h)));
+        if x.w < 0.5 || x.h < 0.5 {
+            p.line_segment([a, b], Stroke::new(1.5, t.accent));
+        } else {
+            p.rect_stroke(Rect::from_two_pos(a, b), 0.0, Stroke::new(1.0, t.accent), egui::StrokeKind::Inside);
+        }
+        return;
+    }
     if deckcraft_geom::preset::is_line_like(&preset) {
         let a = x.affine();
         p.line_segment([xf.to_screen(a * Point::new(0.0, 0.0)), xf.to_screen(a * Point::new(x.w, x.h))], Stroke::new(1.5, t.accent));
diff --git a/crates/ui-egui/src/drawtable_tests.rs b/crates/ui-egui/src/drawtable_tests.rs
new file mode 100644
index 00000000..98866b2d
--- /dev/null
+++ b/crates/ui-egui/src/drawtable_tests.rs
@@ -0,0 +1,84 @@
+//! Draw Table driven like a person: Insert › Table › Draw Table, drag out a table, draw a border
+//! across it, then the Table Eraser merges the cells back.
+
+use deckcraft_engine::Session;
+use egui::{Modifiers, PointerButton};
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn drag(h: &mut Harness<'_, SlideApp>, a: egui::Pos2, b: egui::Pos2) {
+    h.hover_at(a);
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: a, button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    h.run_steps(1);
+    for i in 1..=10 {
+        h.event(egui::Event::PointerMoved(a + (b - a) * (i as f32 / 10.0)));
+        h.run_steps(1);
+    }
+    h.event(egui::Event::PointerButton { pos: b, button: PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(2);
+}
+
+fn table(h: &Harness<'_, SlideApp>) -> Option<(deckcraft_model::Table, deckcraft_geom::Xfrm)> {
+    h.state().session.active()?.shapes().iter().find_map(|s| match &s.kind {
+        deckcraft_model::ShapeKind::Table(t) => Some((t.clone(), s.xfrm?)),
+        _ => None,
+    })
+}
+
+#[test]
+fn draw_a_table_split_it_and_erase_the_border() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.tab = "Insert".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.get_by_label("Table").click();
+    h.run_steps(2);
+    h.get_by_label("Draw Table").click();
+    h.run_steps(2);
+    let (slide, k) = (h.state().slide_rect.unwrap(), h.state().canvas_scale);
+    let at = |x: f32, y: f32| slide.min + egui::vec2(x * k, y * k);
+
+    drag(&mut h, at(200.0, 100.0), at(600.0, 300.0));
+    let (t, x) = table(&h).expect("the pencil drew a table");
+    assert_eq!((t.rows.len(), t.cols.len()), (1, 1));
+    assert!((x.w - 400.0).abs() < 3.0 && (x.h - 200.0).abs() < 3.0, "{x:?}");
+
+    // Still the pencil: a border across, then one down the bottom half only.
+    drag(&mut h, at(205.0, 180.0), at(610.0, 180.0));
+    drag(&mut h, at(350.0, 190.0), at(350.0, 299.0));
+    let (t, _) = table(&h).unwrap();
+    assert_eq!((t.rows.len(), t.cols.len()), (2, 2), "{t:?}");
+    assert_eq!(t.cell(0, 0).unwrap().grid_span, 2, "the top row stays one cell");
+    if let Ok(img) = h.render() {
+        let _ = img.save("/tmp/draw_table.png");
+    }
+
+    // The eraser on the vertical border merges the bottom cells again.
+    let ids: Vec<u32> = h.state().session.active().unwrap().shapes().iter().map(|s| s.id.0).collect();
+    h.state_mut().session.execute("edit.select", &json!({"ids": ids})).unwrap();
+    h.state_mut().ui.tab = "Table Design".into();
+    h.run_steps(3);
+    h.get_by_label("Table Eraser").click();
+    h.run_steps(2);
+    h.hover_at(at(350.0, 250.0));
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: at(350.0, 250.0), button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    h.event(egui::Event::PointerButton { pos: at(350.0, 250.0), button: PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(3);
+    let (t, _) = table(&h).unwrap();
+    assert_eq!(t.cell(1, 0).unwrap().grid_span, 2, "{t:?}");
+    h.state_mut().session.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(table(&h).unwrap().0.cell(1, 0).unwrap().grid_span, 1);
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..0f4a4727 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1027,6 +1027,10 @@ fn insert(app: &mut SlideApp, ui: &mut Ui) {
                 app.dialog = Some(crate::dialogs::Dialog::new("table"));
                 ui.close();
             }
+            if ui.button("Draw Table").clicked() {
+                app.session.set_tool(deckcraft_engine::ToolKind::Shape { preset: deckcraft_engine::tools::DRAW_TABLE.into() });
+                ui.close();
+            }
         });
     });
     group(ui, |ui| {
@@ -2224,6 +2228,18 @@ fn table_design(app: &mut SlideApp, ui: &mut Ui) {
             }
         });
     });
+    // Draw Borders: the pencil splits cells along a line, the eraser merges across a border.
+    group(ui, |ui| {
+        use deckcraft_engine::ToolKind;
+        use deckcraft_engine::tools::{DRAW_TABLE, TABLE_ERASER};
+        let cur = app.session.tool.kind.clone();
+        for (icon, label, preset) in [(Icon::Pencil, "Draw Table", DRAW_TABLE), (Icon::Eraser, "Table Eraser", TABLE_ERASER)] {
+            let on = matches!(&cur, ToolKind::Shape { preset: p } if p == preset);
+            if big_button_ex(ui, icon, label, true, false, on).0.clicked() {
+                app.session.set_tool(if on { ToolKind::Select } else { ToolKind::Shape { preset: preset.into() } });
+            }
+        }
+    });
 }
 
 pub fn paint_table_style(p: &egui::Painter, r: Rect, id: &str, sc: &deckcraft_color::ColorScheme) {
@@ -2420,3 +2436,7 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+#[cfg(test)]
+#[path = "drawtable_tests.rs"]
+mod drawtable_tests;
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 5827b396..97480599 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -39,6 +39,9 @@ pub fn big_button_ex(ui: &mut Ui, icon: Icon, label: &str, enabled: bool, split:
     let text_w = lines.iter().map(|l| ui.fonts_mut(|f| f.layout_no_wrap(l.to_string(), font.clone(), t.text).size().x)).fold(0.0f32, f32::max);
     let w = (text_w + 10.0 + if split && lines.len() == 1 { 10.0 } else { 0.0 }).max(40.0);
     let (rect, resp) = ui.allocate_exact_size(vec2(w, RIBBON_H - 2.0), if enabled { Sense::click() } else { Sense::hover() });
+    // Named for screen readers and UI tests ("Ink to\nShape" reads "Ink to Shape").
+    let spoken = label.replace('\n', " ");
+    resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, &spoken));
     let painter = ui.painter_at(rect.expand(1.0));
     let (main_rect, arrow_rect) = if split {
         (Rect::from_min_max(rect.min, pos2(rect.max.x, rect.min.y + 38.0)), Some(Rect::from_min_max(pos2(rect.min.x, rect.min.y + 38.0), rect.max)))
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..4a1c6a8f 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -9,7 +9,7 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 13 | 16 | 25 | 39% |
 
 | Area | Parity |
 |---|---|
@@ -22,7 +22,7 @@ The summary between `<!-- SUMMARY -->
 | Format | 83% |
 | Arrange | 100% |
 | Text | 80% |
-| Tables | 89% |
+| Tables | 92% |
 | Charts | 65% |
 | SmartArt | 33% |
 | Pictures | 48% |
@@ -164,7 +164,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Text | Right-to-left and complex scripts | P1 | P |
 | Text | East Asian text (CJK fonts, line breaking) | P1 | P |
 | Tables | Insert table (grid picker, dialog) | P0 | D |
-| Tables | Draw table | P2 | M |
+| Tables | Draw table | P2 | P |
 | Tables | Table styles and style options | P0 | D |
 | Tables | Insert/delete rows and columns | P0 | D |
 | Tables | Merge and split cells | P1 | D |

From c4c56a6a8be31b4833fbf9086b896dfca9e24e10 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:27:32 +0300
Subject: [PATCH 178/376] Pictures: Picture Styles gallery and Picture Border

Picture Styles was a menu of six names, each running two or three
separate commands that left the previous style's effects behind. New
picture.style applies one of PowerPoint's 24 picture styles (frames,
shadows, soft edges, reflections, bevels, rounded, snipped and oval
shapes, a rotated frame) as one step that replaces the whole previous
look; picture.styles lists them and "none" clears the style. Picture
Format shows them as a thumbnail gallery, and a Picture Border split
button sets outline colour, weight and dashes.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/mod.rs           |   2 +
 crates/engine/src/cmd/picture_style.rs | 158 +++++++++++++++++++++++++
 crates/engine/src/tests.rs             |  48 ++++++++
 crates/ui-egui/src/ribbon.rs           | 112 ++++++++++++++----
 docs/parity-checklist.md               |   8 +-
 5 files changed, 303 insertions(+), 25 deletions(-)
 create mode 100644 crates/engine/src/cmd/picture_style.rs

diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..5a03b1b0 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -10,6 +10,7 @@ pub mod insert;
 pub mod inspect;
 pub mod media;
 pub mod merge;
+pub mod picture_style;
 pub mod review;
 pub mod selection;
 pub mod shape;
@@ -130,6 +131,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(slide::specs());
         v.extend(insert::specs());
         v.extend(shape::specs());
+        v.extend(picture_style::specs());
         v.extend(arrange::specs());
         v.extend(selection::specs());
         v.extend(merge::specs());
diff --git a/crates/engine/src/cmd/picture_style.rs b/crates/engine/src/cmd/picture_style.rs
new file mode 100644
index 00000000..a6a7380f
--- /dev/null
+++ b/crates/engine/src/cmd/picture_style.rs
@@ -0,0 +1,158 @@
+//! Picture Format ▸ Picture Styles: PowerPoint's quick styles for pictures, each a frame (shape,
+//! outline) and effects applied as one step, replacing the previous style.
+
+use deckcraft_color::{ColorTransform, Rgba};
+use deckcraft_model::style::{Effects, Reflection, Shadow};
+use deckcraft_model::{ColorRef, Geom, Line, Shape};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![
+        cmd!(
+            "picture.style",
+            "Picture Styles",
+            ["Picture Format", "Picture Styles"],
+            None,
+            "{style: simpleFrameWhite|dropShadowRectangle|softEdgeOval|… | none (see picture.styles), ids?}",
+            has_selection,
+            style
+        ),
+        cmd!(query "picture.styles", "Picture Style Gallery", [], None, "{} → [{id, label}]", always, |_s, _p| Ok(json!(
+            STYLES.iter().map(|(id, label)| json!({"id": id, "label": label})).collect::<Vec<_>>()
+        ))),
+    ]
+}
+
+/// (id, label), in PowerPoint's gallery order.
+pub const STYLES: [(&str, &str); 24] = [
+    ("simpleFrameWhite", "Simple Frame, White"),
+    ("beveledMatteWhite", "Beveled Matte, White"),
+    ("metalFrame", "Metal Frame"),
+    ("dropShadowRectangle", "Drop Shadow Rectangle"),
+    ("roundedDiagonalCornerWhite", "Rounded Diagonal Corner, White"),
+    ("snipDiagonalCornerWhite", "Snip Diagonal Corner, White"),
+    ("moderateFrameWhite", "Moderate Frame, White"),
+    ("rotatedWhite", "Rotated, White"),
+    ("perspectiveShadowWhite", "Perspective Shadow, White"),
+    ("softEdgeRectangle", "Soft Edge Rectangle"),
+    ("doubleFrameBlack", "Double Frame, Black"),
+    ("thickMatteBlack", "Thick Matte, Black"),
+    ("simpleFrameBlack", "Simple Frame, Black"),
+    ("beveledOvalBlack", "Beveled Oval, Black"),
+    ("compoundFrameBlack", "Compound Frame, Black"),
+    ("centerShadowRectangle", "Center Shadow Rectangle"),
+    ("softEdgeOval", "Soft Edge Oval"),
+    ("reflectedRoundedRectangle", "Reflected Rounded Rectangle"),
+    ("reflectedBevelWhite", "Reflected Bevel, White"),
+    ("metalRoundedRectangle", "Metal Rounded Rectangle"),
+    ("moderateFrameBlack", "Moderate Frame, Black"),
+    ("bevelRectangle", "Bevel Rectangle"),
+    ("bevelPerspective", "Bevel Perspective"),
+    ("metalOval", "Metal Oval"),
+];
+
+/// The look of a style: geometry, outline (colour, width) and effects.
+pub struct Look {
+    pub preset: &'static str,
+    pub frame: Option<(Rgba, f64)>,
+    pub shadow: Option<&'static str>,
+    pub soft_edge: Option<f64>,
+    pub reflection: bool,
+    pub bevel: Option<&'static str>,
+    pub rot: Option<f64>,
+}
+
+pub fn look(id: &str) -> Option<Look> {
+    let white = Rgba::rgb(0xFF, 0xFF, 0xFF);
+    let black = Rgba::rgb(0, 0, 0);
+    let silver = Rgba::rgb(0xC0, 0xC0, 0xC0);
+    let l = |preset, frame, shadow| Look { preset, frame, shadow, soft_edge: None, reflection: false, bevel: None, rot: None };
+    Some(match id {
+        "simpleFrameWhite" => l("rect", Some((white, 7.0)), Some("soft")),
+        "beveledMatteWhite" => Look { bevel: Some("circle"), ..l("rect", Some((white, 6.0)), Some("soft")) },
+        "metalFrame" => Look { bevel: Some("angle"), ..l("rect", Some((silver, 7.0)), Some("soft")) },
+        "dropShadowRectangle" => l("rect", None, Some("drop")),
+        "roundedDiagonalCornerWhite" => l("round2DiagRect", Some((white, 6.0)), Some("soft")),
+        "snipDiagonalCornerWhite" => l("snip2DiagRect", Some((white, 6.0)), Some("soft")),
+        "moderateFrameWhite" => l("rect", Some((white, 4.5)), Some("soft")),
+        "rotatedWhite" => Look { rot: Some(356.0), ..l("rect", Some((white, 6.0)), Some("soft")) },
+        "perspectiveShadowWhite" => l("rect", Some((white, 4.0)), Some("perspective")),
+        "softEdgeRectangle" => Look { soft_edge: Some(10.0), ..l("rect", None, None) },
+        "doubleFrameBlack" => l("rect", Some((black, 6.0)), None),
+        "thickMatteBlack" => l("rect", Some((black, 10.0)), Some("soft")),
+        "simpleFrameBlack" => l("rect", Some((black, 5.0)), None),
+        "beveledOvalBlack" => Look { bevel: Some("circle"), ..l("ellipse", Some((black, 4.0)), Some("soft")) },
+        "compoundFrameBlack" => l("rect", Some((black, 4.5)), None),
+        "centerShadowRectangle" => l("rect", None, Some("center")),
+        "softEdgeOval" => Look { soft_edge: Some(12.0), ..l("ellipse", None, None) },
+        "reflectedRoundedRectangle" => Look { reflection: true, ..l("roundRect", None, None) },
+        "reflectedBevelWhite" => Look { reflection: true, bevel: Some("circle"), ..l("rect", Some((white, 4.0)), None) },
+        "metalRoundedRectangle" => Look { bevel: Some("angle"), ..l("roundRect", Some((silver, 6.0)), Some("soft")) },
+        "moderateFrameBlack" => l("rect", Some((black, 4.5)), Some("soft")),
+        "bevelRectangle" => Look { bevel: Some("angle"), ..l("rect", None, Some("soft")) },
+        "bevelPerspective" => Look { bevel: Some("relaxedInset"), ..l("rect", None, Some("perspective")) },
+        "metalOval" => Look { bevel: Some("angle"), ..l("ellipse", Some((silver, 6.0)), Some("soft")) },
+        _ => return None,
+    })
+}
+
+fn shadow(kind: &str) -> Shadow {
+    let base = Shadow {
+        color: ColorRef::rgb(Rgba::BLACK).with(ColorTransform::Alpha(40000)),
+        blur: 4.0,
+        dist: 3.0,
+        dir: 45.0,
+        inner: false,
+        sx: 1.0,
+        sy: 1.0,
+        kx: 0.0,
+        ky: 0.0,
+        align: "tl".into(),
+        rotate_with_shape: false,
+    };
+    match kind {
+        "drop" => Shadow { blur: 12.0, dist: 6.0, dir: 90.0, ..base },
+        "center" => Shadow { blur: 16.0, dist: 0.0, ..base },
+        "perspective" => Shadow { sy: 0.23, kx: -20.0, dir: 90.0, dist: 0.0, blur: 6.0, align: "bl".into(), ..base },
+        _ => base,
+    }
+}
+
+/// Apply style `id` (or clear the style with `none`) to `sh`.
+pub fn apply(sh: &mut Shape, id: &str) -> bool {
+    if id == "none" {
+        sh.geom = Geom::preset("rect");
+        sh.line = None;
+        sh.effects = None;
+        return true;
+    }
+    let Some(lk) = look(id) else { return false };
+    sh.geom = Geom::preset(lk.preset);
+    sh.line = Some(lk.frame.map_or_else(Line::none, |(c, w)| Line::solid(ColorRef::rgb(c), w)));
+    let e = Effects {
+        outer_shadow: lk.shadow.map(shadow),
+        soft_edge: lk.soft_edge,
+        reflection: lk.reflection.then_some(Reflection { blur: 0.5, start_alpha: 0.5, end_alpha: 0.0, end_pos: 0.35, dist: 0.0 }),
+        bevel: lk.bevel.map(str::to_string),
+        ..Default::default()
+    };
+    sh.effects = (!e.is_empty()).then_some(e);
+    if let (Some(r), Some(x)) = (lk.rot, sh.xfrm.as_mut()) {
+        x.rot = r;
+    }
+    true
+}
+
+fn style(s: &mut Session, p: &Value) -> Result<Value> {
+    let id = str_param(p, "style").ok_or_else(|| bad("picture.style", "missing `style`"))?.to_string();
+    if id != "none" && look(&id).is_none() {
+        return Err(bad("picture.style", format!("unknown style `{id}`; see picture.styles")));
+    }
+    edit_shapes(s, p, "picture.style", |sh| {
+        apply(sh, &id);
+        Ok(())
+    })
+}
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..deb5e6cb 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,51 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn picture_styles_replace_each_other_in_one_step() {
+    const PNG: &[u8] = &[
+        0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+        0x01, 0x08, 0x06, 0x00, 0x00, 0x00, 0x1f, 0x15, 0xc4, 0x89, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x63, 0xf8, 0xcf,
+        0xc0, 0xf0, 0x1f, 0x00, 0x05, 0x00, 0x01, 0xff, 0x89, 0x99, 0x3d, 0x1d, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60,
+        0x82,
+    ];
+    let mut s = session();
+    let data = cmd::base64_encode(PNG);
+    let id = s.execute("insert.picture", &json!({"data": data, "name": "a.png", "rect": [100.0, 100.0, 200.0, 150.0]})).unwrap()["id"].clone();
+    let pic = |s: &Session| s.doc().unwrap().shapes().iter().find(|sh| json!(sh.id) == id).unwrap().clone();
+    assert_eq!(s.execute("picture.styles", &json!({})).unwrap().as_array().unwrap().len(), 24);
+
+    s.execute("picture.style", &json!({"ids": [id], "style": "reflectedRoundedRectangle"})).unwrap();
+    let p = pic(&s);
+    assert_eq!(p.geom.preset_name(), Some("roundRect"));
+    assert!(p.effects.as_ref().unwrap().reflection.is_some());
+
+    // The next style replaces the whole look: no leftover reflection.
+    s.execute("picture.style", &json!({"ids": [id], "style": "simpleFrameWhite"})).unwrap();
+    let p = pic(&s);
+    assert_eq!(p.geom.preset_name(), Some("rect"));
+    let e = p.effects.as_ref().unwrap();
+    assert!(e.reflection.is_none() && e.outer_shadow.is_some());
+    assert_eq!(p.line.as_ref().and_then(|l| l.width), Some(7.0));
+
+    s.execute("picture.style", &json!({"ids": [id], "style": "softEdgeOval"})).unwrap();
+    let p = pic(&s);
+    assert_eq!(p.geom.preset_name(), Some("ellipse"));
+    assert_eq!(p.effects.as_ref().unwrap().soft_edge, Some(12.0));
+    assert!(p.line.as_ref().is_some_and(|l| l.fill == Some(deckcraft_model::Fill::None)));
+
+    // Survives PPTX.
+    let doc = s.doc().unwrap().doc.as_ref().clone();
+    let back = deckcraft_pptx::import(&deckcraft_pptx::export(&doc).unwrap()).unwrap();
+    let bp = back.slides.iter().flat_map(|sl| &sl.shapes).find(|sh| matches!(sh.kind, deckcraft_model::ShapeKind::Picture { .. })).unwrap();
+    assert_eq!(bp.geom.preset_name(), Some("ellipse"));
+    assert_eq!(bp.effects.as_ref().and_then(|e| e.soft_edge), Some(12.0));
+
+    // One undo step per style; none clears; unknown is refused.
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(pic(&s).geom.preset_name(), Some("rect"));
+    s.execute("picture.style", &json!({"ids": [id], "style": "none"})).unwrap();
+    assert!(pic(&s).effects.is_none() && pic(&s).line.is_none());
+    assert!(s.execute("picture.style", &json!({"ids": [id], "style": "sparkly"})).is_err());
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..ed4d4271 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2090,29 +2090,59 @@ fn picture_format(app: &mut SlideApp, ui: &mut Ui) {
         });
     });
     group(ui, |ui| {
-        let r = big_button(ui, Icon::QuickStyles, "Picture\nStyles", true);
-        egui::Popup::menu(&r).show(|ui| {
-            if ui.button("Simple Frame, White").clicked() {
-                run(app, "shape.line", json!({"color": "#FFFFFF", "width": 6}));
-                run(app, "shape.effects", json!({"shadow": "outer"}));
-            }
-            if ui.button("Drop Shadow Rectangle").clicked() {
-                run(app, "shape.effects", json!({"shadow": "bottom"}));
-            }
-            if ui.button("Rounded Diagonal Corner").clicked() {
-                run(app, "shape.change", json!({"preset": "round2DiagRect"}));
-            }
-            if ui.button("Soft Edge Rectangle").clicked() {
-                run(app, "shape.effects", json!({"softEdges": 10}));
-            }
-            if ui.button("Reflected Rounded Rectangle").clicked() {
-                run(app, "shape.change", json!({"preset": "roundRect"}));
-                run(app, "shape.effects", json!({"reflection": "half"}));
-            }
-            if ui.button("Oval").clicked() {
-                run(app, "shape.change", json!({"preset": "ellipse"}));
+        use deckcraft_engine::cmd::picture_style::{STYLES, look};
+        let names: Vec<String> = STYLES.iter().map(|(_, l)| l.to_string()).collect();
+        if let Some(i) = widgets::gallery(
+            ui,
+            STYLES.len(),
+            vec2(56.0, 44.0),
+            None,
+            |p, r, i| paint_picture_style(p, r, STYLES.get(i).and_then(|(id, _)| look(id))),
+            |i| names.get(i).cloned().unwrap_or_default(),
+        ) && let Some((id, _)) = STYLES.get(i)
+        {
+            run(app, "picture.style", json!({"style": id}));
+        }
+    });
+    group(ui, |ui| {
+        let sc = scheme(app);
+        let (m, a) = color_split(ui, Icon::QuickStyles, "Picture Border", Color32::BLACK, true);
+        if m.clicked() {
+            run(app, "shape.line", json!({"color": "#000000", "width": 1.0}));
+        }
+        widgets::color_popup(&a).show(|ui| {
+            if let Some(c) = widgets::color_grid(ui, &sc, Some("No Outline")) {
+                match c {
+                    Some(c) => run(app, "shape.line", json!({"color": cref_param(&c)})),
+                    None => run(app, "shape.line", json!({"none": true})),
+                }
             }
+            ui.separator();
+            ui.menu_button("Weight", |ui| {
+                for w in [0.25, 0.5, 0.75, 1.0, 1.5, 2.25, 3.0, 4.5, 6.0] {
+                    if ui.button(format!("{w} pt")).clicked() {
+                        run(app, "shape.line", json!({"width": w}));
+                    }
+                }
+            });
+            ui.menu_button("Dashes", |ui| {
+                for (l, d) in [
+                    ("Solid", "solid"),
+                    ("Round Dot", "sysDot"),
+                    ("Square Dot", "sysDash"),
+                    ("Dash", "dash"),
+                    ("Dash Dot", "dashDot"),
+                    ("Long Dash", "lgDash"),
+                ] {
+                    if ui.button(l).clicked() {
+                        run(app, "shape.line", json!({"dash": d}));
+                    }
+                }
+            });
         });
+        if ui.small_button("Reset Style").on_hover_text("Remove the picture style").clicked() {
+            run(app, "picture.style", json!({"style": "none"}));
+        }
         big(app, ui, Icon::AltText, "Alt\nText", "app.dialog", json!({"id": "altText"}));
     });
     arrange_group(app, ui);
@@ -2226,6 +2256,46 @@ fn table_design(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+/// A Picture Styles gallery tile: a landscape "picture" in the style's shape and frame.
+fn paint_picture_style(p: &egui::Painter, r: Rect, lk: Option<deckcraft_engine::cmd::picture_style::Look>) {
+    let Some(lk) = lk else { return };
+    let r = r.shrink(7.0);
+    if lk.shadow.is_some() {
+        p.rect_filled(r.translate(vec2(2.0, 2.0)), CornerRadius::same(2), Color32::from_black_alpha(60));
+    }
+    let sky = Color32::from_rgb(0x7F, 0xB2, 0xE5);
+    let frame = lk.frame.map(|(c, w)| Stroke::new((w as f32 / 2.5).clamp(1.0, 4.0), theme::to_color32(c)));
+    let edge = Stroke::new(0.5, Color32::from_gray(150));
+    match lk.preset {
+        "ellipse" => {
+            p.add(egui::Shape::ellipse_filled(r.center(), r.size() / 2.0, sky));
+            p.add(egui::Shape::ellipse_stroke(r.center(), r.size() / 2.0, frame.unwrap_or(edge)));
+        }
+        preset => {
+            let round = if preset == "rect" { 0 } else { 6 };
+            p.rect_filled(r, CornerRadius::same(round), sky);
+            p.rect_stroke(r, CornerRadius::same(round), frame.unwrap_or(edge), egui::StrokeKind::Middle);
+        }
+    }
+    // Hills, so the tile reads as a picture.
+    let base = r.bottom() - r.height() * 0.15;
+    p.line_segment(
+        [pos2(r.left() + r.width() * 0.2, base), pos2(r.center().x, r.top() + r.height() * 0.45)],
+        Stroke::new(1.5, Color32::from_rgb(0x3A, 0x7D, 0x44)),
+    );
+    p.line_segment(
+        [pos2(r.center().x, r.top() + r.height() * 0.45), pos2(r.right() - r.width() * 0.2, base)],
+        Stroke::new(1.5, Color32::from_rgb(0x3A, 0x7D, 0x44)),
+    );
+    if lk.reflection {
+        p.rect_filled(
+            Rect::from_min_max(pos2(r.left(), r.bottom() + 1.0), pos2(r.right(), r.bottom() + 5.0)),
+            CornerRadius::ZERO,
+            sky.gamma_multiply(0.3),
+        );
+    }
+}
+
 pub fn paint_table_style(p: &egui::Painter, r: Rect, id: &str, sc: &deckcraft_color::ColorScheme) {
     let slot = match id.rsplit('-').next().unwrap_or("accent1") {
         "accent2" => deckcraft_color::SchemeSlot::Accent2,
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..fbf8d75f 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -3,12 +3,12 @@
 > **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 79%** over 191 features.
+**Weighted breadth parity: 80%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
+| P1 | 65 | 39 | 20 | 6 | 75% |
 | P2 | 54 | 13 | 15 | 26 | 38% |
 
 | Area | Parity |
@@ -25,7 +25,7 @@ The summary between `<!-- SUMMARY -->
 | Tables | 89% |
 | Charts | 65% |
 | SmartArt | 33% |
-| Pictures | 48% |
+| Pictures | 52% |
 | Media | 67% |
 | Transitions | 92% |
 | Animations | 79% |
@@ -184,7 +184,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Pictures | Corrections, colour, transparency | P1 | P |
 | Pictures | Artistic effects | P2 | M |
 | Pictures | Remove background | P2 | M |
-| Pictures | Picture styles and borders | P1 | P |
+| Pictures | Picture styles and borders | P1 | D |
 | Pictures | Change / reset picture | P1 | D |
 | Pictures | Compress pictures | P2 | M |
 | Pictures | Paste image from clipboard (fails on Windows and Linux, #53) | P0 | P |

From 36acf26f1d00046dd228419d263ef94ca431be4c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:30:59 +0300
Subject: [PATCH 179/376] Pictures: Recolor gallery and Set Transparent Color

The model, renderer and PPTX already handled duotone, black-and-white,
grayscale and a transparent colour, but the Color menu offered only
saturation and grayscale. picture.recolor applies PowerPoint's Recolor
presets (No Recolor, Grayscale, Sepia, Washout, Black and White 25/50/75%,
and dark and light variations of Text 2 and the six accents) replacing
the previous recolour; picture.recolors lists them. picture.transparentColor
makes a colour transparent or clears it. The Color menu shows a Recolor
gallery of preview ramps and a Set Transparent Color colour picker.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/mod.rs     |   2 +
 crates/engine/src/cmd/recolor.rs | 136 +++++++++++++++++++++++++++++++
 crates/engine/src/tests.rs       |  48 +++++++++++
 crates/ui-egui/src/ribbon.rs     |  65 ++++++++++++++-
 docs/parity-checklist.md         |   2 +-
 5 files changed, 250 insertions(+), 3 deletions(-)
 create mode 100644 crates/engine/src/cmd/recolor.rs

diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..479488c6 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -10,6 +10,7 @@ pub mod insert;
 pub mod inspect;
 pub mod media;
 pub mod merge;
+pub mod recolor;
 pub mod review;
 pub mod selection;
 pub mod shape;
@@ -130,6 +131,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(slide::specs());
         v.extend(insert::specs());
         v.extend(shape::specs());
+        v.extend(recolor::specs());
         v.extend(arrange::specs());
         v.extend(selection::specs());
         v.extend(merge::specs());
diff --git a/crates/engine/src/cmd/recolor.rs b/crates/engine/src/cmd/recolor.rs
new file mode 100644
index 00000000..3ee049eb
--- /dev/null
+++ b/crates/engine/src/cmd/recolor.rs
@@ -0,0 +1,136 @@
+//! Picture Format ▸ Color: Recolor presets and Set Transparent Color.
+
+use deckcraft_color::{Rgba, SchemeSlot};
+use deckcraft_model::style::PictureAdjust;
+use deckcraft_model::{ColorRef, ShapeKind};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![
+        cmd!(
+            "picture.recolor",
+            "Recolor",
+            ["Picture Format", "Adjust", "Color"],
+            None,
+            "{preset: none|grayscale|sepia|washout|bw25|bw50|bw75|accent1Dark…accent6Dark|accent1Light…accent6Light|tx2Dark|tx2Light (see picture.recolors), ids?}",
+            has_selection,
+            recolor
+        ),
+        cmd!(query "picture.recolors", "Recolor Gallery", [], None, "{} → [{id, label}]", always, |_s, _p| Ok(json!(
+            presets().into_iter().map(|(id, label)| json!({"id": id, "label": label})).collect::<Vec<_>>()
+        ))),
+        cmd!(
+            "picture.transparentColor",
+            "Set Transparent Color",
+            ["Picture Format", "Adjust", "Color"],
+            None,
+            "{color: #RRGGBB | none: true, ids?} (pixels of that colour become transparent)",
+            has_selection,
+            transparent_color
+        ),
+    ]
+}
+
+const ACCENTS: [(&str, &str, SchemeSlot); 7] = [
+    ("tx2", "Text color 2", SchemeSlot::Dk2),
+    ("accent1", "Accent color 1", SchemeSlot::Accent1),
+    ("accent2", "Accent color 2", SchemeSlot::Accent2),
+    ("accent3", "Accent color 3", SchemeSlot::Accent3),
+    ("accent4", "Accent color 4", SchemeSlot::Accent4),
+    ("accent5", "Accent color 5", SchemeSlot::Accent5),
+    ("accent6", "Accent color 6", SchemeSlot::Accent6),
+];
+
+/// (id, label), in PowerPoint's gallery order: colour modes, then dark and light variations.
+pub fn presets() -> Vec<(String, String)> {
+    let mut v: Vec<(String, String)> = [
+        ("none", "No Recolor"),
+        ("grayscale", "Grayscale"),
+        ("sepia", "Sepia"),
+        ("washout", "Washout"),
+        ("bw25", "Black and White: 25%"),
+        ("bw50", "Black and White: 50%"),
+        ("bw75", "Black and White: 75%"),
+    ]
+    .iter()
+    .map(|(a, b)| (a.to_string(), b.to_string()))
+    .collect();
+    for (id, label, _) in ACCENTS {
+        v.push((format!("{id}Dark"), format!("{label} Dark")));
+    }
+    for (id, label, _) in ACCENTS {
+        v.push((format!("{id}Light"), format!("{label} Light")));
+    }
+    v
+}
+
+/// Set `a`'s recolour to `preset`, clearing any earlier one. `false` for an unknown preset.
+pub fn apply(a: &mut PictureAdjust, preset: &str) -> bool {
+    let washed = a.brightness == 0.7 && a.contrast == -0.7;
+    let mut n = PictureAdjust { grayscale: false, duotone: None, bilevel: None, ..a.clone() };
+    if washed {
+        n.brightness = 0.0;
+        n.contrast = 0.0;
+    }
+    let rgb = |r, g, b| ColorRef::rgb(Rgba::rgb(r, g, b));
+    match preset {
+        "none" => {}
+        "grayscale" => n.grayscale = true,
+        // PowerPoint's sepia is a duotone from dark brown to light cream.
+        "sepia" => n.duotone = Some((rgb(0x40, 0x2A, 0x10), rgb(0xF2, 0xE3, 0xC6))),
+        // Washout is PowerPoint's +70% brightness, −70% contrast.
+        "washout" => {
+            n.brightness = 0.7;
+            n.contrast = -0.7;
+        }
+        "bw25" => n.bilevel = Some(0.25),
+        "bw50" => n.bilevel = Some(0.5),
+        "bw75" => n.bilevel = Some(0.75),
+        other => {
+            let Some((slot, dark)) = ACCENTS.iter().find_map(|(id, _, slot)| {
+                other.strip_prefix(id).and_then(|rest| match rest {
+                    "Dark" => Some((*slot, true)),
+                    "Light" => Some((*slot, false)),
+                    _ => None,
+                })
+            }) else {
+                return false;
+            };
+            let c = ColorRef::scheme(slot);
+            n.duotone = Some(if dark { (rgb(0, 0, 0), c) } else { (c, rgb(0xFF, 0xFF, 0xFF)) });
+        }
+    }
+    *a = n;
+    true
+}
+
+fn recolor(s: &mut Session, p: &Value) -> Result<Value> {
+    let preset = str_param(p, "preset").ok_or_else(|| bad("picture.recolor", "missing `preset`"))?.to_string();
+    if !presets().iter().any(|(id, _)| *id == preset) {
+        return Err(bad("picture.recolor", format!("unknown preset `{preset}`; see picture.recolors")));
+    }
+    edit_shapes(s, p, "picture.recolor", |sh| {
+        if let ShapeKind::Picture { fill } = &mut sh.kind {
+            apply(&mut fill.adjust, &preset);
+        }
+        Ok(())
+    })
+}
+
+fn transparent_color(s: &mut Session, p: &Value) -> Result<Value> {
+    let c = if bool_or(p, "none", false) {
+        None
+    } else {
+        let hex = str_param(p, "color").ok_or_else(|| bad("picture.transparentColor", "give `color` (#RRGGBB) or `none: true`"))?;
+        Some(Rgba::from_hex(hex.trim_start_matches('#')).ok_or_else(|| bad("picture.transparentColor", format!("bad colour `{hex}`")))?)
+    };
+    edit_shapes(s, p, "picture.transparentColor", |sh| {
+        if let ShapeKind::Picture { fill } = &mut sh.kind {
+            fill.adjust.clear_color = c;
+        }
+        Ok(())
+    })
+}
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..a756da42 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,51 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn picture_recolor_and_transparent_color() {
+    const PNG: &[u8] = &[
+        0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
+        0x01, 0x08, 0x06, 0x00, 0x00, 0x00, 0x1f, 0x15, 0xc4, 0x89, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x63, 0xf8, 0xcf,
+        0xc0, 0xf0, 0x1f, 0x00, 0x05, 0x00, 0x01, 0xff, 0x89, 0x99, 0x3d, 0x1d, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60,
+        0x82,
+    ];
+    let mut s = session();
+    let id = s.execute("insert.picture", &json!({"data": cmd::base64_encode(PNG), "name": "a.png"})).unwrap()["id"].clone();
+    let adj = |s: &Session| match &s.doc().unwrap().shapes().iter().find(|sh| json!(sh.id) == id).unwrap().kind {
+        deckcraft_model::ShapeKind::Picture { fill } => fill.adjust.clone(),
+        _ => panic!("not a picture"),
+    };
+    assert_eq!(s.execute("picture.recolors", &json!({})).unwrap().as_array().unwrap().len(), 21);
+    s.execute("picture.recolor", &json!({"ids": [id], "preset": "bw50"})).unwrap();
+    assert_eq!(adj(&s).bilevel, Some(0.5));
+    // A new preset replaces the old one.
+    s.execute("picture.recolor", &json!({"ids": [id], "preset": "accent2Light"})).unwrap();
+    let a = adj(&s);
+    assert!(a.bilevel.is_none());
+    assert!(matches!(&a.duotone, Some((d, _)) if *d == deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Accent2)));
+    s.execute("picture.recolor", &json!({"ids": [id], "preset": "washout"})).unwrap();
+    let a = adj(&s);
+    assert!(a.duotone.is_none() && a.brightness == 0.7 && a.contrast == -0.7);
+    s.execute("picture.recolor", &json!({"ids": [id], "preset": "grayscale"})).unwrap();
+    let a = adj(&s);
+    assert!(a.grayscale && a.brightness == 0.0, "washout undone by the next preset");
+    assert!(s.execute("picture.recolor", &json!({"ids": [id], "preset": "plaid"})).is_err());
+
+    s.execute("picture.transparentColor", &json!({"ids": [id], "color": "#FFFFFF"})).unwrap();
+    assert_eq!(adj(&s).clear_color, Some(deckcraft_color::Rgba::rgb(255, 255, 255)));
+    // Both survive PPTX.
+    let doc = s.doc().unwrap().doc.as_ref().clone();
+    let back = deckcraft_pptx::import(&deckcraft_pptx::export(&doc).unwrap()).unwrap();
+    let ba = back.slides.iter().flat_map(|sl| &sl.shapes).find_map(|sh| match &sh.kind {
+        deckcraft_model::ShapeKind::Picture { fill } => Some(fill.adjust.clone()),
+        _ => None,
+    });
+    let ba = ba.unwrap();
+    assert!(ba.grayscale);
+    assert_eq!(ba.clear_color, Some(deckcraft_color::Rgba::rgb(255, 255, 255)));
+    s.execute("picture.transparentColor", &json!({"ids": [id], "none": true})).unwrap();
+    assert!(adj(&s).clear_color.is_none());
+    s.execute("picture.recolor", &json!({"ids": [id], "preset": "none"})).unwrap();
+    assert_eq!(adj(&s), deckcraft_model::style::PictureAdjust::default());
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..df6073ea 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2072,9 +2072,39 @@ fn picture_format(app: &mut SlideApp, ui: &mut Ui) {
                     run(app, "picture.adjust", json!({"saturation": s}));
                 }
             }
-            if ui.button("Grayscale").clicked() {
-                run(app, "picture.adjust", json!({"grayscale": true}));
+            ui.separator();
+            ui.label("Recolor");
+            let sc = scheme(app);
+            let presets = deckcraft_engine::cmd::recolor::presets();
+            let names: Vec<String> = presets.iter().map(|(_, l)| l.clone()).collect();
+            if let Some(i) = widgets::gallery(
+                ui,
+                presets.len(),
+                vec2(40.0, 30.0),
+                None,
+                |p, r, i| {
+                    if let Some((id, _)) = presets.get(i) {
+                        paint_recolor(p, r, id, &sc);
+                    }
+                },
+                |i| names.get(i).cloned().unwrap_or_default(),
+            ) && let Some((id, _)) = presets.get(i)
+            {
+                run(app, "picture.recolor", json!({"preset": id}));
             }
+            ui.separator();
+            ui.menu_button("Set Transparent Color", |ui| {
+                ui.label("Pixels of this colour become transparent:");
+                if let Some(c) = widgets::color_grid(ui, &sc, Some("None")) {
+                    match c {
+                        Some(c) => {
+                            let rgb = c.resolve(&sc, None);
+                            run(app, "picture.transparentColor", json!({"color": format!("#{}", rgb.hex())}));
+                        }
+                        None => run(app, "picture.transparentColor", json!({"none": true})),
+                    }
+                }
+            });
         });
         let r = big_button(ui, Icon::Transparency, "Transparency", true);
         egui::Popup::menu(&r).show(|ui| {
@@ -2226,6 +2256,37 @@ fn table_design(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+/// A Recolor gallery tile: a dark-to-light ramp as the preset would draw it.
+fn paint_recolor(p: &egui::Painter, r: Rect, id: &str, sc: &deckcraft_color::ColorScheme) {
+    let mut adj = deckcraft_model::style::PictureAdjust::default();
+    deckcraft_engine::cmd::recolor::apply(&mut adj, id);
+    let r = r.shrink(3.0);
+    let n = 8;
+    for k in 0..n {
+        let t = k as f64 / (n - 1) as f64;
+        // A colourful ramp, so "No Recolor" shows colour and the presets show their mapping.
+        let src = [t * 255.0, (0.4 + 0.6 * t) * 200.0, (1.0 - t) * 220.0];
+        let y = 0.299 * src[0] + 0.587 * src[1] + 0.114 * src[2];
+        let mut rgb = if adj.grayscale { [y; 3] } else { src };
+        if adj.brightness != 0.0 || adj.contrast != 0.0 {
+            rgb = rgb.map(|v| (v - 127.5) * (1.0 + adj.contrast) + 127.5 + adj.brightness * 255.0);
+        }
+        if let Some((d, l)) = &adj.duotone {
+            let (d, l) = (d.resolve(sc, None), l.resolve(sc, None));
+            let u = y / 255.0;
+            rgb =
+                [d.r as f64 + (l.r as f64 - d.r as f64) * u, d.g as f64 + (l.g as f64 - d.g as f64) * u, d.b as f64 + (l.b as f64 - d.b as f64) * u];
+        }
+        if let Some(th) = adj.bilevel {
+            rgb = [if y >= th * 255.0 { 255.0 } else { 0.0 }; 3];
+        }
+        let c = Color32::from_rgb(rgb[0].clamp(0.0, 255.0) as u8, rgb[1].clamp(0.0, 255.0) as u8, rgb[2].clamp(0.0, 255.0) as u8);
+        let w = r.width() / n as f32;
+        p.rect_filled(Rect::from_min_size(pos2(r.left() + k as f32 * w, r.top()), vec2(w + 0.5, r.height())), CornerRadius::ZERO, c);
+    }
+    p.rect_stroke(r, CornerRadius::ZERO, Stroke::new(0.5, Color32::from_gray(160)), egui::StrokeKind::Outside);
+}
+
 pub fn paint_table_style(p: &egui::Painter, r: Rect, id: &str, sc: &deckcraft_color::ColorScheme) {
     let slot = match id.rsplit('-').next().unwrap_or("accent1") {
         "accent2" => deckcraft_color::SchemeSlot::Accent2,
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..aee4e613 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -181,7 +181,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Pictures | Insert picture (PNG, JPEG, GIF, WebP, BMP, TIFF) | P0 | D |
 | Pictures | SVG pictures | P1 | M |
 | Pictures | Crop (and crop to shape, aspect ratio) | P0 | P |
-| Pictures | Corrections, colour, transparency | P1 | P |
+| Pictures | Corrections, colour, transparency (recolor and Set Transparent Color done; sharpen/soften and colour temperature pending) | P1 | P |
 | Pictures | Artistic effects | P2 | M |
 | Pictures | Remove background | P2 | M |
 | Pictures | Picture styles and borders | P1 | P |

From 1b326e2e8729d31925e6dbdb9d8484242d51afae Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:34:30 +0300
Subject: [PATCH 180/376] Review: Thesaurus pane with a built-in English word
 list

Review > Thesaurus (Shift+F7) opens a Thesaurus pane on the selected
word, or on the word at the caret. Clicking a synonym while editing
text puts it in place of that word in one undo step, and the pane
then looks up the new word. You can also type a word into the pane to
look it up.

The word list is written for DeckCraft and has no third-party source:
about 260 senses of common presentation vocabulary in
engine/data/thesaurus.txt. It is embedded, so the Thesaurus also
works offline and in the browser build. Lookups try simple English
endings and keep the word's capitalisation. New commands:
review.thesaurus (a query) and review.replaceWord. Ribbon big buttons
now carry an accessibility label.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/data/thesaurus.txt      | 264 ++++++++++++++++++++++++++
 crates/engine/src/cmd/review.rs       |  43 +++++
 crates/engine/src/lib.rs              |   1 +
 crates/engine/src/thesaurus.rs        | 119 ++++++++++++
 crates/ui-egui/src/lib.rs             |  17 ++
 crates/ui-egui/src/panes.rs           |  41 ++++
 crates/ui-egui/src/ribbon.rs          |   3 +-
 crates/ui-egui/src/thesaurus_tests.rs |  54 ++++++
 crates/ui-egui/src/widgets.rs         |   3 +
 docs/parity-checklist.md              |   6 +-
 10 files changed, 546 insertions(+), 5 deletions(-)
 create mode 100644 crates/engine/data/thesaurus.txt
 create mode 100644 crates/engine/src/thesaurus.rs
 create mode 100644 crates/ui-egui/src/thesaurus_tests.rs

diff --git a/crates/engine/data/thesaurus.txt b/crates/engine/data/thesaurus.txt
new file mode 100644
index 00000000..1916eb46
--- /dev/null
+++ b/crates/engine/data/thesaurus.txt
@@ -0,0 +1,264 @@
+# DeckCraft's built-in thesaurus: headword|synonym, synonym, ...
+# Written for DeckCraft (no third-party word list). Lowercase; one meaning group per line;
+# a headword may appear on several lines (one per sense).
+ability|capability, capacity, skill, competence, talent
+able|capable, competent, qualified, skilled
+accept|agree to, approve, adopt, embrace
+accurate|precise, exact, correct, right
+achieve|accomplish, attain, reach, realize, deliver
+achievement|accomplishment, success, attainment, milestone
+add|include, append, attach, insert
+advantage|benefit, edge, strength, asset, upside
+affect|influence, impact, change, alter
+aim|goal, objective, target, purpose, intent
+allow|permit, enable, let, authorize
+analyze|examine, study, assess, evaluate, review
+answer|reply, response, solution
+approach|method, strategy, way, technique, plan
+area|region, field, domain, zone, sector
+arrange|organize, order, sort, plan
+ask|request, inquire, query, question
+assess|evaluate, gauge, judge, review, appraise
+assist|help, aid, support, back
+attempt|try, effort, endeavor, bid
+bad|poor, weak, inferior, unfavorable, negative
+basic|fundamental, essential, core, elementary, simple
+begin|start, commence, launch, initiate, open
+benefit|advantage, gain, value, payoff, upside
+best|finest, top, leading, optimal, premier
+big|large, major, substantial, significant, sizable
+boost|increase, raise, lift, improve, strengthen
+brief|short, concise, succinct, quick
+bright|vivid, brilliant, luminous, clever
+build|construct, create, develop, assemble, establish
+business|company, firm, enterprise, organization, venture
+buy|purchase, acquire, obtain
+careful|cautious, thorough, meticulous, attentive
+cause|reason, source, origin, driver
+change|alter, modify, adjust, revise, transform
+change|shift, transition, adjustment, revision
+cheap|inexpensive, affordable, low-cost, economical
+check|verify, confirm, examine, inspect, review
+choice|option, alternative, selection, pick
+choose|select, pick, opt for, decide on
+clear|plain, obvious, evident, transparent, lucid
+client|customer, buyer, account, patron
+close|near, nearby, adjacent
+close|end, finish, conclude, shut
+common|frequent, usual, typical, widespread, shared
+company|business, firm, organization, enterprise, corporation
+complete|finish, conclude, finalize, accomplish
+complete|whole, full, entire, total
+complex|complicated, intricate, involved, elaborate
+concern|worry, issue, problem, risk
+consider|weigh, contemplate, evaluate, think about
+continue|proceed, carry on, keep going, persist, maintain
+cost|price, expense, charge, outlay
+create|make, build, produce, design, generate
+critical|crucial, vital, essential, key, decisive
+current|present, existing, ongoing, latest, up-to-date
+customer|client, buyer, consumer, user
+data|information, figures, facts, statistics
+decide|determine, choose, resolve, settle
+decrease|reduce, lower, cut, decline, drop
+define|specify, describe, explain, outline
+deliver|provide, supply, bring, hand over, ship
+demonstrate|show, prove, illustrate, display
+describe|explain, outline, portray, depict
+design|plan, layout, blueprint, pattern
+design|create, plan, devise, draft
+develop|build, create, grow, expand, evolve
+difference|distinction, contrast, gap, variation
+different|distinct, various, diverse, unlike
+difficult|hard, challenging, tough, demanding
+discuss|talk about, debate, examine, review
+easy|simple, straightforward, effortless, painless
+effect|result, impact, outcome, consequence
+effective|successful, efficient, productive, powerful
+effort|work, attempt, endeavor, exertion
+end|finish, conclusion, close, completion
+enough|sufficient, adequate, ample
+ensure|guarantee, make sure, secure, confirm
+error|mistake, fault, flaw, bug, slip
+essential|vital, crucial, key, necessary, fundamental
+establish|set up, found, create, institute
+estimate|forecast, projection, approximation, guess
+evaluate|assess, appraise, judge, rate, review
+event|occasion, function, happening, incident
+example|instance, case, illustration, sample
+excellent|outstanding, superb, exceptional, first-rate
+expand|grow, extend, enlarge, broaden, scale
+expect|anticipate, foresee, predict, await
+explain|clarify, describe, illustrate, account for
+fail|fall short, miss, flop, break down
+fast|quick, rapid, swift, speedy
+feature|characteristic, attribute, capability, function
+final|last, closing, concluding, ultimate
+find|discover, locate, identify, uncover
+finish|complete, end, conclude, wrap up
+focus|concentrate, center, target, emphasize
+focus|emphasis, priority, attention, core
+future|upcoming, coming, forthcoming, prospective
+gain|increase, rise, improvement, profit
+get|obtain, acquire, receive, gain
+give|provide, offer, supply, grant
+goal|aim, objective, target, purpose, ambition
+good|fine, great, strong, solid, positive
+great|excellent, outstanding, terrific, remarkable
+grow|increase, expand, rise, develop, scale
+growth|expansion, increase, development, rise
+help|assist, aid, support, enable
+help|assistance, aid, support, guidance
+high|elevated, tall, top, strong
+idea|concept, notion, thought, proposal
+identify|recognize, pinpoint, detect, determine
+impact|effect, influence, consequence, result
+important|significant, key, major, crucial, vital
+improve|enhance, upgrade, refine, strengthen, boost
+include|contain, cover, incorporate, comprise
+increase|raise, boost, grow, expand, lift
+increase|rise, growth, gain, jump
+information|data, details, facts, knowledge
+innovative|inventive, creative, original, novel, pioneering
+issue|problem, concern, matter, question
+job|task, assignment, role, position
+keep|retain, maintain, preserve, hold
+key|main, central, critical, essential, principal
+large|big, sizable, substantial, major, extensive
+last|final, latest, previous, closing
+launch|start, introduce, roll out, release, unveil
+lead|guide, direct, head, steer, run
+learn|discover, find out, master, study
+less|fewer, smaller, reduced, lower
+little|small, minor, slight, modest
+look|appear, seem
+look|view, glance, examine, inspect
+low|minimal, modest, small, reduced
+main|primary, chief, principal, central, key
+maintain|keep, preserve, sustain, uphold
+major|significant, important, key, principal, big
+make|create, build, produce, generate
+manage|run, handle, oversee, direct, lead
+market|industry, sector, segment, marketplace
+measure|gauge, assess, quantify, track
+meet|satisfy, fulfil, reach, achieve
+meeting|session, conference, discussion, review
+method|approach, technique, process, procedure, way
+model|framework, template, pattern, design
+more|additional, extra, further, added
+move|shift, transfer, relocate, transition
+need|requirement, demand, necessity
+need|require, call for, demand, want
+new|fresh, recent, novel, modern, latest
+next|following, upcoming, subsequent
+number|figure, count, total, quantity, amount
+objective|goal, aim, target, purpose
+offer|provide, propose, extend, present
+old|previous, former, legacy, outdated, existing
+open|start, launch, begin, unveil
+opportunity|opening, chance, prospect, possibility
+option|choice, alternative, possibility, route
+organize|arrange, structure, coordinate, order
+outcome|result, consequence, effect, end result
+overview|summary, outline, synopsis, recap
+part|portion, piece, segment, section, component
+partner|ally, collaborator, associate, affiliate
+people|staff, team, individuals, personnel
+plan|strategy, scheme, roadmap, proposal, program
+plan|organize, arrange, schedule, prepare
+point|aspect, detail, issue, argument
+popular|well-liked, widespread, in demand, favored
+possible|feasible, achievable, viable, potential
+present|show, display, introduce, demonstrate
+present|current, existing, ongoing
+price|cost, rate, charge, fee
+priority|focus, concern, precedence, goal
+problem|issue, challenge, difficulty, obstacle
+process|procedure, method, workflow, system
+produce|make, create, generate, manufacture, yield
+product|offering, item, solution, good
+profit|earnings, return, gain, margin
+progress|advance, headway, development, improvement
+project|initiative, program, undertaking, venture
+propose|suggest, recommend, put forward, offer
+provide|give, supply, deliver, offer
+purpose|aim, goal, objective, intent, reason
+quality|standard, caliber, excellence, grade
+question|query, issue, inquiry
+quick|fast, rapid, speedy, swift, prompt
+rapid|fast, quick, swift, speedy
+reach|achieve, attain, hit, arrive at
+reason|cause, rationale, motive, basis
+recent|latest, new, current, fresh
+recommend|suggest, advise, propose, advocate
+reduce|cut, lower, decrease, lessen, trim
+region|area, territory, zone, market
+relevant|pertinent, applicable, related, appropriate
+remove|delete, eliminate, take out, drop
+replace|substitute, swap, supersede, change
+report|account, summary, review, statement
+require|need, demand, call for, necessitate
+research|study, investigation, analysis, inquiry
+resource|asset, supply, means, capacity
+result|outcome, effect, consequence, finding
+review|assessment, evaluation, examination, analysis
+review|examine, assess, evaluate, check, revisit
+revenue|income, sales, earnings, turnover
+risk|danger, threat, exposure, hazard
+role|part, function, position, responsibility
+run|operate, manage, conduct, execute
+safe|secure, protected, reliable
+same|identical, equal, matching, equivalent
+save|keep, store, preserve, conserve
+see|view, observe, notice, spot
+sell|market, offer, trade, retail
+service|support, assistance, offering
+share|portion, part, stake, percentage
+share|distribute, spread, communicate, pass on
+show|demonstrate, display, present, reveal, illustrate
+significant|important, notable, considerable, major, meaningful
+similar|alike, comparable, related, equivalent
+simple|easy, straightforward, plain, basic
+size|scale, extent, magnitude, dimensions
+small|little, minor, compact, modest
+solution|answer, fix, remedy, resolution
+solve|resolve, fix, settle, work out
+specific|particular, precise, exact, distinct
+start|begin, launch, commence, kick off, initiate
+step|stage, phase, measure, action
+strategy|plan, approach, policy, roadmap, tactic
+strong|robust, solid, powerful, sturdy
+structure|framework, organization, layout, arrangement
+success|achievement, accomplishment, win, triumph
+successful|effective, thriving, prosperous, winning
+suggest|propose, recommend, advise, imply
+summary|overview, recap, synopsis, digest
+support|help, back, assist, sustain
+support|help, assistance, backing, aid
+sure|certain, confident, positive, definite
+target|goal, objective, aim
+task|job, assignment, duty, activity
+team|group, crew, staff, squad, unit
+test|trial, check, experiment, evaluation
+test|try, check, evaluate, verify
+think|believe, consider, reckon, suppose
+time|period, duration, while, moment
+tool|instrument, utility, device, aid
+total|sum, whole, aggregate, overall
+trend|pattern, tendency, movement, direction
+understand|grasp, comprehend, follow, realize
+unique|distinctive, singular, one-of-a-kind, unmatched
+update|revise, refresh, upgrade, modernize
+update|revision, change, upgrade, news
+use|employ, apply, utilize, leverage
+useful|helpful, practical, handy, valuable
+value|worth, benefit, merit, importance
+various|diverse, assorted, different, several
+view|opinion, perspective, outlook, position
+vision|outlook, aspiration, goal, dream
+way|method, approach, manner, means
+weak|feeble, fragile, poor, limited
+well|effectively, successfully, nicely, properly
+work|labor, effort, activity, job
+work|function, operate, run, succeed
+year|annum, twelve months
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 8e3a532c..bf3b3920 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -16,6 +16,16 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("comment.resolve", "Resolve Thread", ["Comments"], None, "{index, resolved?: bool}", has_slide, resolve),
         cmd!(query "comment.list", "Comments", [], None, "{slide?} → comments", has_slide, list),
         cmd!(query "review.accessibility", "Check Accessibility", ["Review", "Accessibility"], None, "{} → [{slide, shape, issue}]", has_doc, accessibility),
+        cmd!(query "review.thesaurus", "Thesaurus", ["Review", "Proofing"], None, "{word?: default the selected word, or the word at the caret} → {word, senses: [{word, synonyms}]}", has_doc, thesaurus),
+        cmd!(
+            "review.replaceWord",
+            "Insert Synonym",
+            [],
+            None,
+            "{with}: replace the selected word (or the word at the caret) while editing text",
+            has_text,
+            replace_word
+        ),
         cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{} → [{slide, shape, word}] (words not in the built-in list)", has_doc, spelling),
         cmd!(noundo "show.fromStart", "Play from Start", ["Slide Show", "Start Slide Show"], Some("Cmd+Shift+Enter"), "{}", has_slide, |s, _| start(s, 0)),
         cmd!(noundo "show.fromCurrent", "Play from Current Slide", ["Slide Show", "Start Slide Show"], Some("Cmd+Enter"), "{}", has_slide, |s, _| {
@@ -264,3 +274,36 @@ fn custom_show(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     ok()
 }
+
+/// The selected text when it lies in one paragraph, else the word at the caret.
+fn word_under_caret(s: &Session) -> Option<String> {
+    let st = s.doc().ok()?;
+    let t = st.selection.text.clone()?;
+    let body = super::text::body_of(st, &t)?;
+    let (a, b) = if t.anchor != t.caret { t.ordered() } else { deckcraft_model::edit::word_at(body, t.caret) };
+    if a.0 != b.0 {
+        return None;
+    }
+    let text = body.paragraphs.get(a.0)?.text();
+    let w: String = text.chars().skip(a.1).take(b.1.saturating_sub(a.1)).collect();
+    let w = w.trim().to_string();
+    (!w.is_empty()).then_some(w)
+}
+
+fn thesaurus(s: &mut Session, p: &Value) -> Result<Value> {
+    let word = str_param(p, "word").map(str::to_string).or_else(|| word_under_caret(s)).unwrap_or_default();
+    let senses = crate::thesaurus::lookup(&word);
+    Ok(json!({"word": word, "senses": senses}))
+}
+
+fn replace_word(s: &mut Session, p: &Value) -> Result<Value> {
+    let with = str_param(p, "with").filter(|w| !w.trim().is_empty()).ok_or_else(|| bad("review.replaceWord", "missing `with`"))?.to_string();
+    if with.chars().count() > 200 {
+        return Err(bad("review.replaceWord", "too long"));
+    }
+    let collapsed = s.doc()?.selection.text.as_ref().is_some_and(|t| t.anchor == t.caret);
+    if collapsed {
+        s.execute("text.selectWord", &json!({}))?;
+    }
+    s.execute("text.insert", &json!({"text": with}))
+}
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..398801d4 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -15,6 +15,7 @@ pub mod keys;
 pub mod links;
 pub mod recovery;
 pub mod sample;
+pub mod thesaurus;
 pub mod tools;
 
 use std::sync::Arc;
diff --git a/crates/engine/src/thesaurus.rs b/crates/engine/src/thesaurus.rs
new file mode 100644
index 00000000..10cc207d
--- /dev/null
+++ b/crates/engine/src/thesaurus.rs
@@ -0,0 +1,119 @@
+//! Review › Thesaurus: synonyms from a small built-in English word list (`data/thesaurus.txt`),
+//! looked up offline so it works in the browser build too.
+
+const DATA: &str = include_str!("../data/thesaurus.txt");
+
+/// One sense of a word: its headword and synonyms.
+#[derive(Clone, Debug, PartialEq, serde::Serialize)]
+pub struct Sense {
+    pub word: String,
+    pub synonyms: Vec<String>,
+}
+
+fn senses_of(head: &str) -> Vec<Sense> {
+    DATA.lines()
+        .filter(|l| !l.starts_with('#'))
+        .filter_map(|l| l.split_once('|'))
+        .filter(|(h, _)| h.trim() == head)
+        .map(|(h, s)| Sense { word: h.trim().to_string(), synonyms: s.split(',').map(|x| x.trim().to_string()).filter(|x| !x.is_empty()).collect() })
+        .collect()
+}
+
+/// The senses for `word`, trying simple English endings when the word itself isn't listed
+/// ("goals" → "goal", "improved" → "improve", "growing" → "grow"). Synonyms take the word's
+/// capitalisation ("Goal" → "Aim", "GOAL" → "AIM").
+pub fn lookup(word: &str) -> Vec<Sense> {
+    let w: String = word.trim().trim_matches(|c: char| !c.is_alphanumeric() && c != '-').chars().take(64).collect();
+    let lower = w.to_lowercase();
+    if lower.is_empty() {
+        return vec![];
+    }
+    let mut tries = vec![lower.clone()];
+    for (suffix, add) in [("ies", "y"), ("es", ""), ("s", ""), ("ied", "y"), ("ed", "e"), ("ed", ""), ("ing", "e"), ("ing", "")] {
+        if let Some(stem) = lower.strip_suffix(suffix)
+            && stem.chars().count() >= 2
+        {
+            tries.push(format!("{stem}{add}"));
+        }
+    }
+    let Some(found) = tries.iter().map(|t| senses_of(t)).find(|v| !v.is_empty()) else { return vec![] };
+    let upper = w.chars().count() > 1 && w.chars().all(|c| !c.is_lowercase());
+    let title = !upper && w.chars().next().is_some_and(char::is_uppercase);
+    found
+        .into_iter()
+        .map(|s| Sense {
+            word: s.word,
+            synonyms: s
+                .synonyms
+                .into_iter()
+                .map(|x| {
+                    if upper {
+                        x.to_uppercase()
+                    } else if title {
+                        let mut c = x.chars();
+                        c.next().map(|f| f.to_uppercase().chain(c).collect()).unwrap_or_default()
+                    } else {
+                        x
+                    }
+                })
+                .collect(),
+        })
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn senses_endings_and_case() {
+        let g = lookup("goal");
+        assert_eq!(g.len(), 1);
+        assert!(g[0].synonyms.contains(&"objective".to_string()));
+        assert_eq!(lookup("change").len(), 2, "verb and noun senses");
+        assert_eq!(lookup("Goals")[0].synonyms[0], "Aim");
+        assert_eq!(lookup("GOAL")[0].synonyms[0], "AIM");
+        assert_eq!(lookup("improved")[0].word, "improve");
+        assert_eq!(lookup("growing")[0].word, "grow");
+        assert_eq!(lookup("strategies")[0].word, "strategy");
+        assert_eq!(lookup("“goal,”")[0].word, "goal", "punctuation around the word");
+        assert!(lookup("").is_empty() && lookup("zzxq").is_empty() && lookup("   ").is_empty());
+        assert!(lookup(&"a".repeat(10_000)).is_empty());
+    }
+
+    #[test]
+    fn data_is_well_formed() {
+        for l in DATA.lines().filter(|l| !l.starts_with('#') && !l.trim().is_empty()) {
+            let (h, s) = l.split_once('|').unwrap_or_else(|| panic!("no `|`: {l}"));
+            assert_eq!(h, h.trim().to_lowercase(), "{l}");
+            let syn: Vec<&str> = s.split(',').map(str::trim).collect();
+            assert!(syn.len() >= 2 && syn.iter().all(|x| !x.is_empty() && *x != h), "{l}");
+            let mut d = syn.clone();
+            d.sort();
+            d.dedup();
+            assert_eq!(d.len(), syn.len(), "duplicate synonym: {l}");
+        }
+    }
+
+    #[test]
+    fn commands_look_up_and_replace_the_word_at_the_caret() {
+        use serde_json::json;
+        let mut s = crate::Session::with_new();
+        let id = s.execute("insert.textBox", &json!({"rect": [50, 50, 400, 40]})).unwrap()["id"].as_u64().unwrap();
+        s.execute("text.edit", &json!({"id": id})).unwrap();
+        s.execute("text.insert", &json!({"text": "Our Goal is growth."})).unwrap();
+        s.execute("text.edit", &json!({"id": id, "at": [0, 6]})).unwrap();
+        let r = s.execute("review.thesaurus", &json!({})).unwrap();
+        assert_eq!(r["word"], "Goal");
+        assert_eq!(r["senses"][0]["synonyms"][0], "Aim");
+        s.execute("review.replaceWord", &json!({"with": "Aim"})).unwrap();
+        let text = |s: &crate::Session| {
+            s.doc().unwrap().shapes().iter().find(|x| x.id.0 as u64 == id).and_then(|x| x.text.as_ref()).map(|t| t.paragraphs[0].text()).unwrap()
+        };
+        assert_eq!(text(&s), "Our Aim is growth.");
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(text(&s), "Our Goal is growth.");
+        assert_eq!(s.execute("review.thesaurus", &json!({"word": "growth."})).unwrap()["senses"][0]["word"], "growth");
+        assert!(s.execute("review.replaceWord", &json!({"with": ""})).is_err());
+    }
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..d1a82cb7 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -146,6 +146,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("view.zoomOut", "Zoom Out", Some("Cmd+-"), "{}"),
     ("view.zoom", "Zoom…", None, "{percent}"),
     ("view.fit", "Fit to Window", None, "{}"),
+    ("review.thesaurusPane", "Thesaurus", Some("Shift+F7"), "{word?}: open the Thesaurus pane on the selected word"),
     ("view.pane", "Task Pane", None, "{pane: format|animation|selection|comments|designer|background|null}"),
     ("view.tab", "Ribbon Tab", None, "{tab}"),
     ("view.collapseRibbon", "Collapse the Ribbon", Some("Cmd+F1"), "{}"),
@@ -184,6 +185,8 @@ pub struct SlideApp {
     pub textures: textures::Textures,
     pub control_rx: Option<Receiver<ControlRequest>>,
     pub dialog: Option<dialogs::Dialog>,
+    /// The word looked up in the Thesaurus pane.
+    pub thesaurus_query: String,
     pub show: Option<show::Show>,
     /// Audio/video playback (editor control bar, slide show, `media.*` commands).
     pub media: media::MediaHost,
@@ -239,6 +242,7 @@ impl SlideApp {
             textures: textures::Textures::default(),
             control_rx: None,
             dialog: None,
+            thesaurus_query: String::new(),
             show: None,
             media: media::MediaHost::new(audio_out),
             status: None,
@@ -473,6 +477,19 @@ impl SlideApp {
                 self.ui.zoom = Some((pct as f32 / 100.0).clamp(0.1, 4.0));
             }
             "view.fit" => self.ui.zoom = None,
+            "review.thesaurusPane" => {
+                let word = match p.get("word").and_then(Value::as_str) {
+                    Some(w) => w.to_string(),
+                    None => self
+                        .session
+                        .execute("review.thesaurus", &json!({}))
+                        .ok()
+                        .and_then(|r| r["word"].as_str().map(String::from))
+                        .unwrap_or_default(),
+                };
+                self.thesaurus_query = word;
+                self.ui.pane = Some("thesaurus".into());
+            }
             "view.pane" => {
                 let pane = p.get("pane").and_then(Value::as_str).map(String::from);
                 self.ui.pane =
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..0cf608e6 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -27,6 +27,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                 "selection" => "Selection",
                 "comments" => "Comments",
                 "designer" => "Design Ideas",
+                "thesaurus" => "Thesaurus",
                 _ => "Pane",
             };
             ui.horizontal(|ui| {
@@ -50,6 +51,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                 "selection" => crate::selpane::show(app, ui),
                 "comments" => comments(app, ui),
                 "designer" => designer(app, ui),
+                "thesaurus" => thesaurus(app, ui),
                 _ => {}
             });
         });
@@ -635,3 +637,42 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
         ui.add_space(8.0);
     }
 }
+
+/// Review › Thesaurus: look a word up; clicking a synonym puts it in place of the selected word
+/// when editing text, otherwise looks that synonym up in turn.
+fn thesaurus(app: &mut SlideApp, ui: &mut Ui) {
+    let t = Tokens::get(ui.ctx());
+    let mut q = app.thesaurus_query.clone();
+    let edit = ui.add(egui::TextEdit::singleline(&mut q).hint_text("Search for a word").desired_width(f32::INFINITY));
+    if edit.changed() {
+        app.thesaurus_query = q.clone();
+    }
+    ui.add_space(6.0);
+    let senses = deckcraft_engine::thesaurus::lookup(&q);
+    if q.trim().is_empty() {
+        ui.label(egui::RichText::new("Select a word on the slide, or type one above.").color(t.text_dim));
+        return;
+    }
+    if senses.is_empty() {
+        ui.label(egui::RichText::new(format!("No synonyms for \"{}\".", q.trim())).color(t.text_dim));
+        return;
+    }
+    let editing = app.session.active().is_some_and(|d| d.selection.text.is_some());
+    for sense in senses {
+        ui.label(egui::RichText::new(&sense.word).font(theme::bold(13.0)));
+        for syn in sense.synonyms {
+            let r = ui.add(egui::Button::new(&syn).frame(false)).on_hover_text(if editing { "Insert" } else { "Look up" });
+            if r.clicked() {
+                if editing {
+                    run(app, "review.replaceWord", json!({"with": syn}));
+                }
+                app.thesaurus_query = syn;
+            }
+        }
+        ui.add_space(6.0);
+    }
+}
+
+#[cfg(test)]
+#[path = "thesaurus_tests.rs"]
+mod thesaurus_tests;
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..d9c9f39c 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1780,8 +1780,7 @@ fn record(app: &mut SlideApp, ui: &mut Ui) {
 fn review(app: &mut SlideApp, ui: &mut Ui) {
     group(ui, |ui| {
         big(app, ui, Icon::Spelling, "Spelling", "app.dialog", json!({"id": "spelling"}));
-        let r = big_button(ui, Icon::Thesaurus, "Thesaurus", false);
-        let _ = r.on_hover_text("Thesaurus (coming soon)");
+        big(app, ui, Icon::Thesaurus, "Thesaurus", "review.thesaurusPane", json!({}));
     });
     group(ui, |ui| {
         big(app, ui, Icon::Accessibility, "Check\nAccessibility", "app.dialog", json!({"id": "accessibility"}));
diff --git a/crates/ui-egui/src/thesaurus_tests.rs b/crates/ui-egui/src/thesaurus_tests.rs
new file mode 100644
index 00000000..985e6401
--- /dev/null
+++ b/crates/ui-egui/src/thesaurus_tests.rs
@@ -0,0 +1,54 @@
+//! Review › Thesaurus driven like a person: caret in a word, open the pane, click a synonym.
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+#[test]
+fn thesaurus_pane_swaps_the_word_at_the_caret() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let id = s.execute("insert.textBox", &json!({"rect": [100, 100, 500, 50]})).unwrap()["id"].as_u64().unwrap();
+    s.execute("text.edit", &json!({"id": id})).unwrap();
+    s.execute("text.insert", &json!({"text": "Our Goal is growth."})).unwrap();
+    s.execute("text.edit", &json!({"id": id, "at": [0, 6]})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.tab = "Review".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.get_by_label("Thesaurus").click();
+    h.run_steps(3);
+    assert_eq!(h.state().ui.pane.as_deref(), Some("thesaurus"));
+    assert_eq!(h.state().thesaurus_query, "Goal");
+    if let Ok(img) = h.render() {
+        let _ = img.save("/tmp/thesaurus.png");
+    }
+    h.get_by_label("Objective").click();
+    h.run_steps(3);
+    let text = h
+        .state()
+        .session
+        .active()
+        .unwrap()
+        .shapes()
+        .iter()
+        .find(|x| x.id.0 as u64 == id)
+        .and_then(|x| x.text.as_ref())
+        .map(|t| t.paragraphs[0].text());
+    assert_eq!(text.as_deref(), Some("Our Objective is growth."));
+    assert_eq!(h.state().thesaurus_query, "Objective", "the pane follows the new word");
+
+    // Typing a word that isn't listed says so instead of showing nothing.
+    h.state_mut().thesaurus_query = "zzxq".into();
+    h.run_steps(2);
+    assert!(h.query_by_label_contains("No synonyms").is_some());
+}
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 5827b396..97480599 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -39,6 +39,9 @@ pub fn big_button_ex(ui: &mut Ui, icon: Icon, label: &str, enabled: bool, split:
     let text_w = lines.iter().map(|l| ui.fonts_mut(|f| f.layout_no_wrap(l.to_string(), font.clone(), t.text).size().x)).fold(0.0f32, f32::max);
     let w = (text_w + 10.0 + if split && lines.len() == 1 { 10.0 } else { 0.0 }).max(40.0);
     let (rect, resp) = ui.allocate_exact_size(vec2(w, RIBBON_H - 2.0), if enabled { Sense::click() } else { Sense::hover() });
+    // Named for screen readers and UI tests ("Ink to\nShape" reads "Ink to Shape").
+    let spoken = label.replace('\n', " ");
+    resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, &spoken));
     let painter = ui.painter_at(rect.expand(1.0));
     let (main_rect, arrow_rect) = if split {
         (Rect::from_min_max(rect.min, pos2(rect.max.x, rect.min.y + 38.0)), Some(Rect::from_min_max(pos2(rect.min.x, rect.min.y + 38.0), rect.max)))
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..fb8e3698 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -9,7 +9,7 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 13 | 16 | 25 | 39% |
 
 | Area | Parity |
 |---|---|
@@ -21,7 +21,7 @@ The summary between `<!-- SUMMARY -->
 | Shapes | 88% |
 | Format | 83% |
 | Arrange | 100% |
-| Text | 80% |
+| Text | 81% |
 | Tables | 89% |
 | Charts | 65% |
 | SmartArt | 33% |
@@ -155,7 +155,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Text | Text direction (rotated, stacked) | P1 | D |
 | Text | Find and replace, replace fonts | P1 | P |
 | Text | Spelling check | P1 | P |
-| Text | Thesaurus | P2 | M |
+| Text | Thesaurus | P2 | P |
 | Text | AutoCorrect and smart quotes | P2 | M |
 | Text | Symbols and emoji | P1 | D |
 | Text | Equations | P2 | M |

From bc42b62cc4e6732c3b3216b60f61dd1818eb673b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:35:25 +0300
Subject: [PATCH 181/376] Pictures: Remove Background with a classical matte

The Picture Format > Remove Background button was a disabled
placeholder. picture.removeBackground now flood-fills from every edge
pixel through similar colours: each step must be close to the pixel
before it (so gradients and soft shadows follow) and to the edge colour
it started from (so it can't leak into the subject). That region turns
transparent with a one-pixel soft edge, and the picture points at a new
PNG; undo brings the original back. Tolerance 0-100 (default 20); the
ribbon offers normal, looser and tighter. Pictures whose edges are all
subject are left alone, and pictures over 16 megapixels are refused.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/background.rs | 242 ++++++++++++++++++++++++++++
 crates/engine/src/cmd/mod.rs        |   2 +
 crates/ui-egui/src/ribbon.rs        |  10 +-
 docs/gaps.md                        |   3 +-
 4 files changed, 253 insertions(+), 4 deletions(-)
 create mode 100644 crates/engine/src/cmd/background.rs

diff --git a/crates/engine/src/cmd/background.rs b/crates/engine/src/cmd/background.rs
new file mode 100644
index 00000000..ab881bc0
--- /dev/null
+++ b/crates/engine/src/cmd/background.rs
@@ -0,0 +1,242 @@
+//! Picture Format ▸ Remove Background: a classical matte, no model. The background is what the
+//! picture's edges reach through similar colours: a flood fill from every edge pixel, each step
+//! close to the pixel before it (gradients and soft shadows) and to the edge colour it started
+//! from (so it can't leak into the subject). It turns transparent, with a one-pixel soft edge.
+
+use std::collections::VecDeque;
+
+use deckcraft_model::{ShapeId, ShapeKind};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+/// Larger pictures are refused rather than matted slowly (16 megapixels).
+const MAX_PIXELS: u64 = 16_000_000;
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![cmd!(
+        "picture.removeBackground",
+        "Remove Background",
+        ["Picture Format", "Adjust"],
+        None,
+        "{tolerance?: 0..100 (how different a colour may be from the edge's, default 20), ids?}",
+        has_selection,
+        remove_background
+    )]
+}
+
+fn dist(a: [u8; 4], b: [u8; 4]) -> f64 {
+    let d = |i: usize| f64::from(a[i]) - f64::from(b[i]);
+    (d(0) * d(0) + d(1) * d(1) + d(2) * d(2)).sqrt()
+}
+
+/// Make the background of `img` transparent. `tolerance` is 0–100. Returns how many pixels
+/// became transparent.
+pub fn matte(img: &mut image::RgbaImage, tolerance: f64) -> usize {
+    let (w, h) = (img.width() as usize, img.height() as usize);
+    if w == 0 || h == 0 {
+        return 0;
+    }
+    // Distances run 0–441 (black to white); the step limit follows gradients, the seed limit
+    // keeps the fill on the edge's colour.
+    let seed_tol = tolerance.clamp(0.0, 100.0) * 4.41;
+    let step_tol = (seed_tol * 0.35).max(6.0);
+    let px = |img: &image::RgbaImage, i: usize| img.get_pixel((i % w) as u32, (i / w) as u32).0;
+    // 0: subject, 1: background; the seed colour each background pixel was reached from.
+    let mut bg = vec![false; w * h];
+    let mut seed = vec![[0u8; 4]; w * h];
+    let mut queue = VecDeque::new();
+    let push_edge = |i: usize, bg: &mut [bool], seed: &mut [[u8; 4]], q: &mut VecDeque<usize>| {
+        if let Some(b) = bg.get_mut(i)
+            && !*b
+        {
+            *b = true;
+            if let Some(s) = seed.get_mut(i) {
+                *s = px(img, i);
+            }
+            q.push_back(i);
+        }
+    };
+    for x in 0..w {
+        push_edge(x, &mut bg, &mut seed, &mut queue);
+        push_edge((h - 1) * w + x, &mut bg, &mut seed, &mut queue);
+    }
+    for y in 0..h {
+        push_edge(y * w, &mut bg, &mut seed, &mut queue);
+        push_edge(y * w + w - 1, &mut bg, &mut seed, &mut queue);
+    }
+    while let Some(i) = queue.pop_front() {
+        let (x, y) = (i % w, i / w);
+        let here = px(img, i);
+        let from = seed.get(i).copied().unwrap_or(here);
+        let mut near = [None; 4];
+        if x > 0 {
+            near[0] = Some(i - 1);
+        }
+        if x + 1 < w {
+            near[1] = Some(i + 1);
+        }
+        if y > 0 {
+            near[2] = Some(i - w);
+        }
+        if y + 1 < h {
+            near[3] = Some(i + w);
+        }
+        for j in near.into_iter().flatten() {
+            if bg.get(j).copied().unwrap_or(true) {
+                continue;
+            }
+            let c = px(img, j);
+            // Transparent pixels are background already.
+            if c[3] < 16 || (dist(c, here) <= step_tol && dist(c, from) <= seed_tol) {
+                if let Some(b) = bg.get_mut(j) {
+                    *b = true;
+                }
+                if let Some(s) = seed.get_mut(j) {
+                    *s = from;
+                }
+                queue.push_back(j);
+            }
+        }
+    }
+    // A background edge that is the subject's colour throughout (the subject touches the
+    // edge on every side) is no background: leave such a picture alone.
+    let n = bg.iter().filter(|b| **b).count();
+    if n == w * h {
+        return 0;
+    }
+    let is_bg = |x: usize, y: usize| bg.get(y * w + x).copied().unwrap_or(false);
+    let mut soft = vec![];
+    for y in 0..h {
+        for x in 0..w {
+            if is_bg(x, y) {
+                continue;
+            }
+            let touching =
+                (x > 0 && is_bg(x - 1, y)) || (x + 1 < w && is_bg(x + 1, y)) || (y > 0 && is_bg(x, y - 1)) || (y + 1 < h && is_bg(x, y + 1));
+            if touching {
+                soft.push((x, y));
+            }
+        }
+    }
+    for (i, b) in bg.iter().enumerate() {
+        if *b {
+            img.get_pixel_mut((i % w) as u32, (i / w) as u32).0[3] = 0;
+        }
+    }
+    for (x, y) in soft {
+        let p = img.get_pixel_mut(x as u32, y as u32);
+        p.0[3] = (u16::from(p.0[3]) * 2 / 3) as u8;
+    }
+    n
+}
+
+fn remove_background(s: &mut Session, p: &Value) -> Result<Value> {
+    let tolerance = f64_or(p, "tolerance", 20.0);
+    let ids = targets(s, p)?;
+    let mut done: Vec<(ShapeId, String, Vec<u8>)> = vec![];
+    {
+        let st = s.doc()?;
+        for id in &ids {
+            let Some(sh) = st.shape(*id) else { continue };
+            let ShapeKind::Picture { fill } = &sh.kind else { continue };
+            let Some(item) = st.doc.media(fill.media) else { continue };
+            let Ok(reader) = image::ImageReader::new(std::io::Cursor::new(item.data.as_slice())).with_guessed_format() else { continue };
+            let Ok((iw, ih)) = reader.into_dimensions() else { continue };
+            if u64::from(iw) * u64::from(ih) > MAX_PIXELS {
+                return Err(bad("picture.removeBackground", format!("{iw}×{ih} pixels is too large; compress the picture first")));
+            }
+            let Ok(dynimg) = image::load_from_memory(&item.data) else { continue };
+            let mut img = dynimg.to_rgba8();
+            if matte(&mut img, tolerance) == 0 {
+                continue;
+            }
+            let mut png = vec![];
+            if image::DynamicImage::ImageRgba8(img).write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png).is_err() {
+                continue;
+            }
+            let stem = item.name.rsplit_once('.').map_or(item.name.as_str(), |(a, _)| a);
+            done.push((*id, format!("{stem}-no-background.png"), png));
+        }
+    }
+    if done.is_empty() {
+        return Err(bad("picture.removeBackground", "no background found: select a picture whose edges show its background"));
+    }
+    let n = done.len();
+    s.edit(|doc, sel| {
+        let added: Vec<(ShapeId, deckcraft_model::MediaId)> =
+            done.into_iter().map(|(id, name, png)| (id, doc.add_media(&name, "image/png", png))).collect();
+        let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad("picture.removeBackground", "no slide"))?;
+        for (id, media) in added {
+            if let Some(sh) = deckcraft_model::find_shape_mut(shapes, id)
+                && let ShapeKind::Picture { fill } = &mut sh.kind
+            {
+                fill.media = media;
+            }
+        }
+        Ok(())
+    })?;
+    Ok(json!({"pictures": n}))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// A red disc on a white-to-grey gradient.
+    fn disc() -> image::RgbaImage {
+        image::RgbaImage::from_fn(80, 60, |x, y| {
+            let (dx, dy) = (f64::from(x) - 40.0, f64::from(y) - 30.0);
+            if dx * dx + dy * dy < 15.0 * 15.0 {
+                image::Rgba([220, 30, 30, 255])
+            } else {
+                let g = 255 - (x / 2) as u8;
+                image::Rgba([g, g, g, 255])
+            }
+        })
+    }
+
+    #[test]
+    fn matte_clears_the_gradient_and_keeps_the_subject() {
+        let mut img = disc();
+        let n = matte(&mut img, 20.0);
+        assert!(n > 80 * 60 / 2, "{n}");
+        assert_eq!(img.get_pixel(0, 0).0[3], 0);
+        assert_eq!(img.get_pixel(79, 59).0[3], 0, "the darker end of the gradient");
+        assert_eq!(img.get_pixel(40, 30).0, [220, 30, 30, 255]);
+        // The disc's rim is softened, not cut.
+        let rim = img.get_pixel(40, 16).0[3];
+        assert!(rim > 0 && rim < 255 || img.get_pixel(40, 15).0[3] < 255, "{rim}");
+        // A picture with nothing but subject at its edges is left alone.
+        let mut flat = image::RgbaImage::from_pixel(10, 10, image::Rgba([10, 200, 10, 255]));
+        assert_eq!(matte(&mut flat, 20.0), 0);
+        assert!(flat.pixels().all(|p| p.0[3] == 255));
+    }
+
+    #[test]
+    fn remove_background_replaces_the_picture_and_undoes() {
+        let mut png = vec![];
+        image::DynamicImage::ImageRgba8(disc()).write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png).unwrap();
+        let mut s = Session::with_new();
+        let r = s.execute("insert.picture", &json!({"data": base64_encode(&png), "name": "disc.png"})).unwrap();
+        let id = r["id"].as_u64().unwrap();
+        let media_of = |s: &Session| match &s.doc().unwrap().shape(ShapeId(id as u32)).unwrap().kind {
+            ShapeKind::Picture { fill } => fill.media,
+            _ => panic!("not a picture"),
+        };
+        let before = media_of(&s);
+        s.execute("picture.removeBackground", &json!({"ids": [id]})).unwrap();
+        let after = media_of(&s);
+        assert_ne!(before, after);
+        let item = s.doc().unwrap().doc.media(after).unwrap().clone();
+        assert_eq!(item.name, "disc-no-background.png");
+        let img = image::load_from_memory(&item.data).unwrap().to_rgba8();
+        assert_eq!(img.get_pixel(0, 0).0[3], 0);
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(media_of(&s), before);
+        // Not a picture: refused.
+        s.execute("shape.insert", &json!({"preset": "rect", "rect": [0, 0, 50, 50]})).unwrap();
+        assert!(s.execute("picture.removeBackground", &json!({})).is_err());
+    }
+}
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..178a8dea 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -2,6 +2,7 @@
 
 pub mod animation;
 pub mod arrange;
+pub mod background;
 pub mod design;
 pub mod edit;
 pub mod file;
@@ -130,6 +131,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(slide::specs());
         v.extend(insert::specs());
         v.extend(shape::specs());
+        v.extend(background::specs());
         v.extend(arrange::specs());
         v.extend(selection::specs());
         v.extend(merge::specs());
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..c61b2eda 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2049,8 +2049,14 @@ fn size_group(app: &mut SlideApp, ui: &mut Ui) {
 
 fn picture_format(app: &mut SlideApp, ui: &mut Ui) {
     group(ui, |ui| {
-        let r = big_button(ui, Icon::RemoveBackground, "Remove\nBackground", false);
-        let _ = r.on_hover_text("Remove Background (coming soon)");
+        let r = big_button(ui, Icon::RemoveBackground, "Remove\nBackground", enabled(app, "picture.removeBackground"));
+        egui::Popup::menu(&r).show(|ui| {
+            for (label, tol) in [("Remove Background", 20.0), ("Remove More (looser)", 35.0), ("Remove Less (tighter)", 10.0)] {
+                if ui.button(label).clicked() {
+                    run(app, "picture.removeBackground", json!({"tolerance": tol}));
+                }
+            }
+        });
         let r = big_button(ui, Icon::Corrections, "Corrections", true);
         egui::Popup::menu(&r).show(|ui| {
             for b in [-0.4, -0.2, 0.0, 0.2, 0.4] {
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..808d2d1b 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -185,8 +185,7 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 
 ### Smaller missing rows
 Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
-sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
-matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
+sounds (1–2 h), artistic effects (6–10 h), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
 encryption), ink to shape/text (6–10 h), icons and 3-D models (8–14 h, needs an open icon set).
 

From d4175d2902e54700b140b7659042735b3f27b469 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:37:00 +0300
Subject: [PATCH 182/376] Animations: add 34 PowerPoint motion path presets

Adds Basic (stars, heart, crescent moon, teardrop, ...), Lines & Curves
(zigzag, waves, S curves, spirals, bounces, ...) and Special (figure 8,
bean, peanut, neutron, ...) motion paths with PowerPoint preset ids, so
they appear in the Motion Paths gallery, play back, and round-trip
through PPTX.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/anim/src/effects.rs         |   1 +
 crates/anim/src/path.rs            |  23 +++-
 crates/engine/src/cmd/animation.rs |   2 +-
 crates/engine/src/tests.rs         |  23 ++++
 crates/model/src/anim.rs           | 177 +++++++++++++++++++++++++++++
 docs/animation-parity.md           |   2 +-
 6 files changed, 225 insertions(+), 3 deletions(-)

diff --git a/crates/anim/src/effects.rs b/crates/anim/src/effects.rs
index 37776f83..f68e7b07 100644
--- a/crates/anim/src/effects.rs
+++ b/crates/anim/src/effects.rs
@@ -69,6 +69,7 @@ pub(crate) fn emphasis_persists(effect: &str) -> bool {
 
 fn uses_default_smoothing(effect: &str) -> bool {
     matches!(effect, "fly" | "float" | "rise" | "peek" | "lines" | "arcs" | "turns" | "shapes" | "loops" | "customPath")
+        || deckcraft_model::anim::preset_path(effect).is_some()
 }
 
 impl EffectSpec {
diff --git a/crates/anim/src/path.rs b/crates/anim/src/path.rs
index ffe4f5e6..af61bd58 100644
--- a/crates/anim/src/path.rs
+++ b/crates/anim/src/path.rs
@@ -288,6 +288,27 @@ pub fn default_path(effect: &str, option: &str) -> String {
             }
         },
         "loops" => "M 0 0 C 0.08 -0.1 0.16 0 0.08 0.05 C 0 0.1 -0.08 0.1 -0.08 0 C -0.08 -0.1 0 -0.05 0 0 E".into(),
-        _ => String::new(),
+        other => deckcraft_model::anim::preset_path(other).unwrap_or_default(),
+    }
+}
+
+#[cfg(test)]
+mod preset_path_tests {
+    use super::*;
+
+    #[test]
+    fn every_extra_motion_path_preset_starts_at_its_shape_and_moves() {
+        use deckcraft_model::anim::{ANIMATIONS, AnimClass, preset_path};
+        let extra: Vec<_> = ANIMATIONS.iter().filter(|a| a.2 == AnimClass::Path && preset_path(a.0).is_some()).collect();
+        assert!(extra.len() >= 30);
+        for a in extra {
+            assert_eq!(default_path(a.0, ""), preset_path(a.0).unwrap_or_default());
+            let mp = MotionPath::parse(&default_path(a.0, ""));
+            let (x, y) = mp.at(0.0);
+            assert!(x.abs() < 1e-9 && y.abs() < 1e-9, "{} starts at its shape", a.0);
+            let far = mp.points.iter().map(|p| p.0.abs() + p.1.abs()).fold(0.0, f64::max);
+            assert!(far > 0.05, "{} moves", a.0);
+            assert!(mp.points.iter().all(|p| p.0.abs() < 0.5 && p.1.abs() < 0.5), "{} stays near its shape", a.0);
+        }
     }
 }
diff --git a/crates/engine/src/cmd/animation.rs b/crates/engine/src/cmd/animation.rs
index 8b6fe5a7..d931c216 100644
--- a/crates/engine/src/cmd/animation.rs
+++ b/crates/engine/src/cmd/animation.rs
@@ -127,7 +127,7 @@ pub fn default_path(effect: &str, option: &str) -> String {
         "turns" => format!("M 0 0 L {} {} C {} {} {dx} {} {dx} {dy} E", dx * 0.5, dy * 0.5, dx, dy * 0.5, dy * 0.75),
         "shapes" => "M 0 0 C 0.1 0 0.1 0.15 0 0.15 C -0.1 0.15 -0.1 0 0 0 Z E".into(),
         "loops" => "M 0 0 C 0.1 -0.1 0.2 0.1 0.1 0.1 C 0 0.1 0.1 -0.1 0.25 0 E".into(),
-        _ => format!("M 0 0 L {dx} {dy} E"),
+        other => deckcraft_model::anim::preset_path(other).unwrap_or_else(|| format!("M 0 0 L {dx} {dy} E")),
     }
 }
 
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..17dfcb87 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,26 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn motion_path_presets_have_paths_ids_and_round_trip() {
+    use deckcraft_model::anim::{ANIMATIONS, AnimClass, preset_path};
+    let paths: Vec<_> = ANIMATIONS.iter().filter(|a| a.2 == AnimClass::Path).collect();
+    // Preset ids identify the effect when PowerPoint's file is read back: no two share one.
+    let mut ids: Vec<u32> = paths.iter().map(|a| a.3).collect();
+    ids.sort_unstable();
+    let n = ids.len();
+    ids.dedup();
+    assert_eq!(ids.len(), n, "duplicate motion-path preset ids");
+    assert!(n >= 40, "{n} motion paths");
+    let mut s = session();
+    let id = s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 50, 50]})).unwrap()["id"].clone();
+    s.execute("animation.set", &json!({"ids": [id], "effect": "heart", "class": "path"})).unwrap();
+    let a = s.doc().unwrap().doc.slides[s.doc().unwrap().selection.slide].animations[0].clone();
+    assert_eq!(a.path, preset_path("heart"));
+    let p = s.doc().unwrap().doc.as_ref().clone();
+    let back = deckcraft_pptx::import(&deckcraft_pptx::export(&p).unwrap()).unwrap();
+    let b = back.slides.iter().flat_map(|sl| &sl.animations).next().unwrap();
+    assert_eq!((b.effect.as_str(), b.class), ("heart", AnimClass::Path));
+    assert!(b.path.as_deref().is_some_and(|p| p.contains('L')));
+}
diff --git a/crates/model/src/anim.rs b/crates/model/src/anim.rs
index 7c45aa0f..a707134f 100644
--- a/crates/model/src/anim.rs
+++ b/crates/model/src/anim.rs
@@ -377,6 +377,40 @@ pub static ANIMATIONS: &[(&str, &str, AnimClass, u32, u32, &[&str])] = &[
         &["circle", "diamond", "hexagon", "triangle", "square", "trapezoid", "octagon", "parallelogram", "pentagon"],
     ),
     ("loops", "Loops", AnimClass::Path, 61, 2000, &[]),
+    ("diagonalDownRight", "Diagonal Down Right", AnimClass::Path, 49, 2000, &[]),
+    ("diagonalUpRight", "Diagonal Up Right", AnimClass::Path, 56, 2000, &[]),
+    ("zigzag", "Zigzag", AnimClass::Path, 38, 2000, &[]),
+    ("sineWave", "Sine Wave", AnimClass::Path, 40, 2000, &[]),
+    ("pathWave", "Wave", AnimClass::Path, 47, 2000, &[]),
+    ("decayingWave", "Decaying Wave", AnimClass::Path, 60, 2000, &[]),
+    ("heartbeat", "Heartbeat", AnimClass::Path, 45, 2000, &[]),
+    ("sCurve1", "S Curve 1", AnimClass::Path, 59, 2000, &[]),
+    ("sCurve2", "S Curve 2", AnimClass::Path, 39, 2000, &[]),
+    ("stairsDown", "Stairs Down", AnimClass::Path, 62, 2000, &[]),
+    ("bounceRight", "Bounce Right", AnimClass::Path, 54, 2000, &[]),
+    ("bounceLeft", "Bounce Left", AnimClass::Path, 41, 2000, &[]),
+    ("spiralRight", "Spiral Right", AnimClass::Path, 46, 2000, &[]),
+    ("spiralLeft", "Spiral Left", AnimClass::Path, 55, 2000, &[]),
+    ("spring", "Spring", AnimClass::Path, 53, 2000, &[]),
+    ("funnel", "Funnel", AnimClass::Path, 52, 2000, &[]),
+    ("swoosh", "Swoosh", AnimClass::Path, 30, 2000, &[]),
+    ("star4", "4 Point Star", AnimClass::Path, 16, 2000, &[]),
+    ("star5", "5 Point Star", AnimClass::Path, 5, 2000, &[]),
+    ("star6", "6 Point Star", AnimClass::Path, 11, 2000, &[]),
+    ("star8", "8 Point Star", AnimClass::Path, 17, 2000, &[]),
+    ("heart", "Heart", AnimClass::Path, 9, 2000, &[]),
+    ("crescentMoon", "Crescent Moon", AnimClass::Path, 6, 2000, &[]),
+    ("teardrop", "Teardrop", AnimClass::Path, 18, 2000, &[]),
+    ("football", "Football", AnimClass::Path, 12, 2000, &[]),
+    ("plusPath", "Plus", AnimClass::Path, 32, 2000, &[]),
+    ("rightTriangle", "Right Triangle", AnimClass::Path, 2, 2000, &[]),
+    ("curvedSquare", "Curved Square", AnimClass::Path, 20, 2000, &[]),
+    ("figure8Horizontal", "Horizontal Figure 8", AnimClass::Path, 26, 2000, &[]),
+    ("figure8Vertical", "Vertical Figure 8", AnimClass::Path, 22, 2000, &[]),
+    ("loopDeLoop", "Loop de Loop", AnimClass::Path, 24, 2000, &[]),
+    ("bean", "Bean", AnimClass::Path, 31, 2000, &[]),
+    ("peanut", "Peanut", AnimClass::Path, 27, 2000, &[]),
+    ("neutron", "Neutron", AnimClass::Path, 29, 2000, &[]),
     ("customPath", "Custom Path", AnimClass::Path, 0, 2000, &[]),
     ("play", "Play", AnimClass::Media, 1, 0, &[]),
     ("pause", "Pause", AnimClass::Media, 2, 0, &[]),
@@ -387,6 +421,149 @@ pub fn animation_info(effect: &str, class: AnimClass) -> Option<&'static (&'stat
     ANIMATIONS.iter().find(|a| a.0 == effect && a.2 == class).or_else(|| ANIMATIONS.iter().find(|a| a.0 == effect))
 }
 
+/// The path of a motion-path preset beyond Lines, Arcs, Turns, Shapes and Loops, in slide
+/// fractions from the shape's position (our path syntax: `M`, `L`, `Z`, ending in `E`).
+/// `None` for an effect that isn't one of these presets.
+pub fn preset_path(effect: &str) -> Option<String> {
+    use std::f64::consts::{PI, TAU};
+    use std::fmt::Write;
+    // Sample `f` over 0..=1 into a polyline starting at (0, 0).
+    fn poly(n: usize, closed: bool, f: impl Fn(f64) -> (f64, f64)) -> String {
+        let (x0, y0) = f(0.0);
+        let mut s = String::from("M 0 0");
+        for k in 1..=n {
+            let (x, y) = f(k as f64 / n as f64);
+            let _ = write!(s, " L {:.4} {:.4}", x - x0, y - y0);
+        }
+        if closed {
+            s.push_str(" Z");
+        }
+        s.push_str(" E");
+        s
+    }
+    fn pts(p: &[(f64, f64)], closed: bool) -> String {
+        let mut s = String::from("M 0 0");
+        for (x, y) in p {
+            let _ = write!(s, " L {x:.4} {y:.4}");
+        }
+        if closed {
+            s.push_str(" Z");
+        }
+        s.push_str(" E");
+        s
+    }
+    // A closed curve in polar form r(θ), starting at its top.
+    fn polar(scale: f64, r: impl Fn(f64) -> f64) -> String {
+        poly(96, true, |t| {
+            let a = -PI / 2.0 + TAU * t;
+            let rr = r(a + PI / 2.0) * scale;
+            (rr * a.cos(), rr * a.sin())
+        })
+    }
+    fn star(n: usize, outer: f64, inner: f64) -> String {
+        let mut p = Vec::new();
+        let start = (0.0, -outer);
+        for k in 1..=2 * n {
+            let a = -PI / 2.0 + PI * k as f64 / n as f64;
+            let r = if k % 2 == 1 { inner } else { outer };
+            p.push((r * a.cos() - start.0, r * a.sin() - start.1));
+        }
+        pts(&p, true)
+    }
+    let spiral = |dir: f64| {
+        poly(120, false, move |t| {
+            let r = 0.12 * (1.0 - t);
+            let a = dir * 3.0 * TAU * t;
+            (dir * (0.12 - r * a.cos()), -r * a.sin())
+        })
+    };
+    let bounce = |dir: f64| poly(90, false, move |t| (dir * 0.3 * t, 0.15 * t - 0.1 * (1.0 - t) * (3.0 * PI * t).sin().abs()));
+    Some(match effect {
+        "diagonalDownRight" => pts(&[(0.2, 0.2)], false),
+        "diagonalUpRight" => pts(&[(0.2, -0.2)], false),
+        "zigzag" => pts(&[(0.05, 0.04), (0.1, 0.0), (0.15, 0.04), (0.2, 0.0), (0.25, 0.04), (0.3, 0.0)], false),
+        "sineWave" => poly(64, false, |t| (0.3 * t, 0.04 * (2.0 * TAU * t).sin())),
+        "pathWave" => poly(48, false, |t| (0.3 * t, 0.06 * (TAU * t).sin())),
+        "decayingWave" => poly(96, false, |t| (0.3 * t, 0.07 * (-3.0 * t).exp() * (3.0 * TAU * t).sin())),
+        "heartbeat" => pts(&[(0.08, 0.0), (0.1, -0.08), (0.13, 0.06), (0.15, 0.0), (0.25, 0.0)], false),
+        "sCurve1" => poly(48, false, |t| (0.2 * t, 0.1 - 0.1 * (PI * t).cos())),
+        "sCurve2" => poly(48, false, |t| (0.1 - 0.1 * (PI * t).cos(), 0.2 * t)),
+        "stairsDown" => pts(&[(0.06, 0.0), (0.06, 0.06), (0.12, 0.06), (0.12, 0.12), (0.18, 0.12), (0.18, 0.18)], false),
+        "bounceRight" => bounce(1.0),
+        "bounceLeft" => bounce(-1.0),
+        "spiralRight" => spiral(1.0),
+        "spiralLeft" => spiral(-1.0),
+        "spring" => poly(160, false, |t| (0.3 * t + 0.03 * (5.0 * TAU * t).cos(), 0.03 * (5.0 * TAU * t).sin())),
+        "funnel" => poly(160, false, |t| {
+            let r = 0.12 * (1.0 - t);
+            (r * (3.0 * TAU * t).cos(), 0.25 * t + 0.03 * (3.0 * TAU * t).sin() * (1.0 - t))
+        }),
+        "swoosh" => poly(48, false, |t| (0.3 * t, -0.12 * (PI * t).sin() + 0.1 * t * t)),
+        "star4" => star(4, 0.1, 0.04),
+        "star5" => star(5, 0.1, 0.04),
+        "star6" => star(6, 0.1, 0.05),
+        "star8" => star(8, 0.1, 0.06),
+        "heart" => poly(96, true, |t| {
+            let a = TAU * t;
+            (0.006 * 16.0 * a.sin().powi(3), -0.006 * (13.0 * a.cos() - 5.0 * (2.0 * a).cos() - 2.0 * (3.0 * a).cos() - (4.0 * a).cos()))
+        }),
+        "crescentMoon" => {
+            // The outer arc of a circle, back along a smaller, offset one.
+            let mut p: Vec<(f64, f64)> = (1..=32)
+                .map(|k| {
+                    let a = -PI / 2.0 - PI * k as f64 / 32.0;
+                    (0.1 * a.cos(), 0.1 + 0.1 * a.sin())
+                })
+                .collect();
+            p.extend((1..=32).map(|k| {
+                let a = PI / 2.0 - PI * k as f64 / 32.0;
+                (0.06 * a.cos() - 0.03, 0.1 + 0.1 * a.sin())
+            }));
+            pts(&p, true)
+        }
+        "teardrop" => polar(0.1, |a| 0.6 + 0.4 * (a / 2.0).cos().abs().powf(3.0)),
+        "football" => poly(64, true, |t| {
+            let a = TAU * t;
+            (0.12 * a.sin(), 0.06 * (1.0 - a.cos()) * (1.0 - 0.3 * (2.0 * a).cos().abs()))
+        }),
+        "plusPath" => pts(
+            &[
+                (0.04, 0.0),
+                (0.04, 0.04),
+                (0.08, 0.04),
+                (0.08, 0.08),
+                (0.04, 0.08),
+                (0.04, 0.12),
+                (0.0, 0.12),
+                (0.0, 0.08),
+                (-0.04, 0.08),
+                (-0.04, 0.04),
+                (0.0, 0.04),
+            ],
+            true,
+        ),
+        "rightTriangle" => pts(&[(0.0, 0.15), (0.15, 0.15)], true),
+        "curvedSquare" => poly(96, true, |t| {
+            let a = -PI / 2.0 + TAU * t;
+            let sg = |v: f64| v.signum() * v.abs().sqrt();
+            (0.1 * sg(a.cos()), 0.1 + 0.1 * sg(a.sin()))
+        }),
+        "figure8Horizontal" => poly(96, true, |t| {
+            let a = TAU * t;
+            (0.15 * a.sin(), 0.06 * (2.0 * a).sin())
+        }),
+        "figure8Vertical" => poly(96, true, |t| {
+            let a = TAU * t;
+            (0.06 * (2.0 * a).sin(), 0.15 * (1.0 - a.cos()))
+        }),
+        "loopDeLoop" => poly(120, false, |t| (0.3 * t - 0.05 * (2.0 * TAU * t).sin(), -0.05 * (1.0 - (2.0 * TAU * t).cos()))),
+        "bean" => polar(0.1, |a| 0.75 + 0.25 * a.cos() + 0.15 * (2.0 * a).cos()),
+        "peanut" => polar(0.1, |a| 0.7 + 0.3 * (2.0 * a).cos().abs()),
+        "neutron" => polar(0.1, |a| 0.35 + 0.65 * (3.0 * a).cos().abs()),
+        _ => return None,
+    })
+}
+
 #[cfg(test)]
 mod option_label_tests {
     use super::*;
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 8ec5d0f4..2bb02714 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -54,7 +54,7 @@ perspective-correct subdivided meshes.
 | Entrance | ~50 | 24 | Plus, Wedge, Basic Zoom, Center Revolve, Compress, Stretch, Boomerang, Credits, Curve Up, Drop, Flip, Float, Pinwheel, Spiral In, Whip, Ascend, Descend, Unfold |
 | Emphasis | ~25 | 17 | Brush Color, Bold Reveal, Contrasting Color, Flicker, Grow With Color, Shimmer, Blink |
 | Exit | ~50 | 14 | Mirrors of the missing entrance effects, plus Blinds, Box, Checkerboard, Circle, Diamond, Peek Out, Strips as exits |
-| Motion paths | 64 presets + custom | 6 (Lines, Arcs, Turns, Loops, Shapes-style presets, Custom Path) | Most of Basic (shapes), Lines & Curves and Special presets |
+| Motion paths | 64 presets + custom | 40 + Custom Path (Lines, Arcs, Turns, Loops, Basic shapes such as stars, heart, moon, teardrop; Lines & Curves such as zigzag, waves, S curves, spirals, bounces; Special such as figure 8, bean, peanut, neutron) | Remaining ~24 presets (some Basic shapes, Lines & Curves variants) |
 | Media (Play, Pause, Stop) | 3 (+ Seek) | 3 | Seek, bookmarks as triggers |
 
 By how often people use them, the effects present cover nearly all real decks (Appear, Fade, Fly

From 0e763ab78cc3dd88d6cb6c4dbf2b1b6b99a12a0d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:39:22 +0300
Subject: [PATCH 183/376] Text: Bullets and Numbering dialog
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The Bullets and Numbering menus only offered a fixed list of styles.
"Bullets and Numbering…" at the foot of both menus opens PowerPoint's
dialog: Bulleted and Numbered tabs with their styles, a custom bullet
character, Start at, Size (% of text, 25-400) and Color (automatic,
text or an accent), and None.

format.numbering now takes color and size like format.bullets, and
both clamp the size to PowerPoint's 25-400 %.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/format.rs |  12 +++-
 crates/engine/src/tests.rs      |  20 +++++++
 crates/ui-egui/src/dialogs.rs   | 102 ++++++++++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs    |  12 ++++
 docs/gaps.md                    |   2 +-
 5 files changed, 145 insertions(+), 3 deletions(-)

diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index c68d1242..c97f935d 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -115,7 +115,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Numbering",
             ["Home", "Paragraph"],
             None,
-            "{on?: bool, scheme?: arabicPeriod|arabicParenR|romanUcPeriod|romanLcPeriod|alphaUcPeriod|alphaLcParenR|alphaLcPeriod, start?: n}",
+            "{on?: bool, scheme?: arabicPeriod|arabicParenR|romanUcPeriod|romanLcPeriod|alphaUcPeriod|alphaLcParenR|alphaLcPeriod, start?: n, color?, size?: % of text}",
             has_text_or_shapes,
             numbering
         ),
@@ -442,7 +442,7 @@ fn bullets(s: &mut Session, p: &Value) -> Result<Value> {
     let on = on_param(p, Some(cur));
     let ch = str_param(p, "char").unwrap_or("•").to_string();
     let col = color_param(p, "color");
-    let size = f64_param(p, "size").map(|v| v / 100.0);
+    let size = f64_param(p, "size").map(|v| (v / 100.0).clamp(0.25, 4.0));
     let explicit_char = p.get("char").is_some();
     format_para(s, &move |para| {
         if on {
@@ -471,9 +471,17 @@ fn numbering(s: &mut Session, p: &Value) -> Result<Value> {
     let on = on_param(p, Some(cur));
     let scheme = str_param(p, "scheme").unwrap_or("arabicPeriod").to_string();
     let start = p.get("start").and_then(Value::as_u64).map(|v| v.clamp(1, 32767) as u32).unwrap_or(1);
+    let col = color_param(p, "color");
+    let size = f64_param(p, "size").map(|v| (v / 100.0).clamp(0.25, 4.0));
     format_para(s, &move |para| {
         if on {
             para.props.bullet = Some(Bullet::AutoNum { scheme: scheme.clone(), start_at: start });
+            if col.is_some() {
+                para.props.bullet_color = col.clone();
+            }
+            if size.is_some() {
+                para.props.bullet_size = size;
+            }
             para.props.margin_left = Some(27.0 + 36.0 * para.level as f64);
             para.props.indent = Some(-27.0);
         } else {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..ca2b6a78 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,23 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// Bullets and Numbering dialog: numbering takes a colour and a size like bullets do, and sizes
+/// stay within PowerPoint's 25–400 %.
+#[test]
+fn numbering_takes_color_and_size() {
+    let mut s = Session::with_new();
+    s.execute("insert.textBox", &json!({"rect": [10, 10, 300, 100], "text": "One\nTwo"})).unwrap();
+    s.execute("format.numbering", &json!({"on": true, "scheme": "romanUcPeriod", "start": 3, "color": "accent2", "size": 150})).unwrap();
+    let para = |s: &Session| {
+        let st = s.doc().unwrap();
+        let id = st.selection.shapes[0];
+        st.shape(id).unwrap().text.as_ref().unwrap().paragraphs[0].props.clone()
+    };
+    let pp = para(&s);
+    assert!(matches!(&pp.bullet, Some(deckcraft_model::text::Bullet::AutoNum { scheme, start_at: 3 }) if scheme == "romanUcPeriod"));
+    assert_eq!(pp.bullet_size, Some(1.5));
+    assert_eq!(pp.bullet_color, Some(deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Accent2)));
+    s.execute("format.bullets", &json!({"on": true, "char": "★", "size": 9000})).unwrap();
+    assert_eq!(para(&s).bullet_size, Some(4.0));
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..39086c94 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -55,6 +55,7 @@ fn title(id: &str) -> &'static str {
         "chartData" => "Chart Data",
         "trim" => "Trim Media",
         "smartart" => "Choose a SmartArt Graphic",
+        "bullets" => "Bullets and Numbering",
         "quit" => "DeckCraft",
         _ => "DeckCraft",
     }
@@ -344,6 +345,107 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             }
             ok || cancel
         }
+        "bullets" => {
+            // The current paragraph's list, as the dialog's starting point.
+            let cur = app.session.execute("format.state", &json!({})).ok().unwrap_or(Value::Null);
+            let numbered = cur.get("numbering").and_then(Value::as_bool).unwrap_or(false);
+            let tab = d.get("tab", if numbered { "numbered" } else { "bulleted" });
+            ui.horizontal(|ui| {
+                for (k, l) in [("bulleted", "Bulleted"), ("numbered", "Numbered")] {
+                    if ui.selectable_label(tab == k, l).clicked() {
+                        d.fields.insert("tab".into(), k.into());
+                    }
+                }
+            });
+            ui.separator();
+            let style_key = if tab == "numbered" { "scheme" } else { "char" };
+            let current = d.get(style_key, if tab == "numbered" { "arabicPeriod" } else { "•" });
+            let styles: &[(&str, &str)] = if tab == "numbered" {
+                &[
+                    ("arabicPeriod", "1. 2. 3."),
+                    ("arabicParenR", "1) 2) 3)"),
+                    ("romanUcPeriod", "I. II. III."),
+                    ("romanLcPeriod", "i. ii. iii."),
+                    ("alphaUcPeriod", "A. B. C."),
+                    ("alphaLcParenR", "a) b) c)"),
+                    ("alphaLcPeriod", "a. b. c."),
+                ]
+            } else {
+                &[("•", "•"), ("○", "○"), ("■", "■"), ("□", "□"), ("◆", "◆"), ("➢", "➢"), ("✓", "✓"), ("–", "–"), ("★", "★")]
+            };
+            egui::Grid::new("bullet-styles").show(ui, |ui| {
+                for (i, (k, l)) in styles.iter().enumerate() {
+                    let r = ui.add_sized(
+                        vec2(if tab == "numbered" { 88.0 } else { 44.0 }, 40.0),
+                        egui::Button::selectable(current == *k, egui::RichText::new(*l).size(16.0)),
+                    );
+                    if r.clicked() {
+                        d.fields.insert(style_key.into(), (*k).into());
+                    }
+                    if (i + 1) % if tab == "numbered" { 4 } else { 5 } == 0 {
+                        ui.end_row();
+                    }
+                }
+            });
+            if tab == "bulleted" {
+                field(ui, d, "Custom character:", "custom", "");
+            } else {
+                field(ui, d, "Start at:", "start", "1");
+            }
+            field(ui, d, "Size (% of text):", "size", "100");
+            let colors = [
+                ("", "Automatic"),
+                ("tx1", "Text"),
+                ("accent1", "Accent 1"),
+                ("accent2", "Accent 2"),
+                ("accent3", "Accent 3"),
+                ("accent4", "Accent 4"),
+                ("accent5", "Accent 5"),
+                ("accent6", "Accent 6"),
+            ];
+            let color = d.get("color", "");
+            ui.horizontal(|ui| {
+                ui.add_sized(vec2(120.0, 20.0), egui::Label::new("Color:"));
+                egui::ComboBox::from_id_salt("bullet-color")
+                    .selected_text(colors.iter().find(|c| c.0 == color).map_or("Automatic", |c| c.1))
+                    .show_ui(ui, |ui| {
+                        for (k, l) in colors {
+                            if ui.selectable_label(color == k, l).clicked() {
+                                d.fields.insert("color".into(), k.into());
+                            }
+                        }
+                    });
+            });
+            ui.horizontal(|ui| {
+                if ui.button("None").on_hover_text("Remove bullets and numbering").clicked() {
+                    d.fields.insert("none".into(), "1".into());
+                }
+            });
+            let (ok, cancel) = buttons(ui, "OK");
+            let none = d.fields.contains_key("none");
+            if none {
+                run(app, if tab == "numbered" { "format.numbering" } else { "format.bullets" }, json!({"on": false}));
+            } else if ok {
+                let mut p = json!({"on": true});
+                if let Some(size) = d.get("size", "100").trim().trim_end_matches('%').parse::<f64>().ok().filter(|v| v.is_finite()) {
+                    p["size"] = json!(size.clamp(25.0, 400.0));
+                }
+                if !color.is_empty() {
+                    p["color"] = json!(color);
+                }
+                if tab == "numbered" {
+                    p["scheme"] = json!(d.get("scheme", "arabicPeriod"));
+                    p["start"] = json!(d.get("start", "1").trim().parse::<u64>().unwrap_or(1).clamp(1, 32767));
+                    run(app, "format.numbering", p);
+                } else {
+                    let custom = d.get("custom", "");
+                    let ch = custom.chars().find(|c| !c.is_whitespace()).map(String::from).unwrap_or_else(|| d.get("char", "•"));
+                    p["char"] = json!(ch);
+                    run(app, "format.bullets", p);
+                }
+            }
+            ok || cancel || none
+        }
         "altText" => {
             let cur = app.session.active().and_then(|s| s.selected_shapes().first().map(|x| x.descr.clone())).unwrap_or_default();
             ui.label("How would you describe this object and its context to someone who is blind or has low vision?");
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..4bf8e755 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -556,6 +556,12 @@ fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                                 run(app, "format.bullets", json!({"on": true, "char": ch}));
                             }
                         }
+                        ui.separator();
+                        if ui.button("Bullets and Numbering…").clicked() {
+                            let mut dlg = crate::dialogs::Dialog::new("bullets");
+                            dlg.fields.insert("tab".into(), "bulleted".into());
+                            app.dialog = Some(dlg);
+                        }
                     });
                 }
                 let (m, a) = small_button_ex(ui, Icon::Numbering, "", en, b("numbering"), true);
@@ -580,6 +586,12 @@ fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                                 run(app, "format.numbering", json!({"on": true, "scheme": sch}));
                             }
                         }
+                        ui.separator();
+                        if ui.button("Bullets and Numbering…").clicked() {
+                            let mut dlg = crate::dialogs::Dialog::new("bullets");
+                            dlg.fields.insert("tab".into(), "numbered".into());
+                            app.dialog = Some(dlg);
+                        }
                     });
                 }
                 toggle(app, ui, Icon::DecreaseIndent, "Decrease List Level", "format.outdent", false);
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..af8eb5dc 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -203,7 +203,7 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Find/Replace dialog,
   Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 

From f9d5a431740d74c1da59487cd7651c4037ca1e0d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:43:03 +0300
Subject: [PATCH 184/376] Round-trip comments, links, shows, groups and
 inherited placeholders

An owned corpus of those element kinds survives open, save and reopen.
Paragraph default run properties, including a link, and action sounds
were dropped on save, so import and export now keep them.
---
 ROADMAP.md                           |   9 +-
 crates/engine/src/cmd/insert.rs      |   5 +-
 crates/model/src/edit.rs             |   3 +-
 crates/model/src/resolve.rs          |  10 +-
 crates/model/src/tests.rs            |  11 +-
 crates/model/src/text.rs             |  37 +++-
 crates/pptx/src/read/dml.rs          |  18 +-
 crates/pptx/src/write/dml.rs         |  40 ++--
 crates/pptx/src/write/shapes.rs      |   2 +
 crates/pptx/tests/corpus_elements.rs | 283 +++++++++++++++++++++++++++
 crates/pptx/tests/roundtrip.rs       |   7 +-
 crates/render/src/tests.rs           |   8 +-
 docs/file-format-parity.md           |   7 +-
 docs/gaps.md                         |  14 +-
 docs/roadmap.md                      |  11 +-
 15 files changed, 421 insertions(+), 44 deletions(-)
 create mode 100644 crates/pptx/tests/corpus_elements.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..46ab59fc 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus for comments, links, custom shows, groups and inherited placeholders; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -111,8 +111,9 @@ Ranked; detail and the full beta plan in [docs/roadmap.md](docs/roadmap.md).
 
 1. **No data loss, no startup crashes:** Close's save prompt (#60), Windows GPU crashes (#40, #59),
    image paste (#53), editor soak tests. 10–20 h.
-2. **PPTX on real decks:** owned corpus, round-trip checks, fixes; #70, #74, #77; EMF/WMF and SVG.
-   36–64 h.
+2. **PPTX on real decks:** owned corpus now covers comments, links and actions, custom shows,
+   rotated groups and placeholders that inherit from the layout. Still open: a larger corpus,
+   embedded fonts, #70, #74, #77, EMF/WMF and SVG. 36–64 h.
 3. **Localization:** catalog, system language (#15), zh-Hans, es, fr, de, ja with IME. 27–46 h.
 4. **Output:** vector PDF, printing. 10–16 h.
 5. **Depth that users hit:** font weights (#69), chart data and elements, Animation Pane timeline,
@@ -128,6 +129,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | PPTX round trip of comments, hyperlinks and actions, custom shows, rotated groups, and placeholders that inherit from the layout. Paragraph default formatting (`defRPr`, including a link) and action sounds (the clip, stop-previous, and a custom show's "Show and return") are kept. Embedded fonts and comment threads stay open |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +152,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: PPTX corpus for comments, links, custom shows, groups and inherited placeholders |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..a57bfea3 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -589,7 +589,8 @@ fn hyperlink(s: &mut Session, p: &Value) -> Result<Value> {
         return Err(bad("insert.hyperlink", "missing `url` or `slide`"));
     };
     let display = str_param(p, "text").map_or(display, str::to_string);
-    let link = Hyperlink { action, tooltip: str_param(p, "tooltip").unwrap_or("").to_string(), highlight_click: false };
+    let link =
+        Hyperlink { action, tooltip: str_param(p, "tooltip").unwrap_or("").to_string(), highlight_click: false, sound: None, stop_sound: false };
     if s.doc()?.selection.text.is_some() {
         return super::text::link_text(s, link, &display);
     }
@@ -621,7 +622,7 @@ fn action_button(s: &mut Session, p: &Value) -> Result<Value> {
         xfrm: Some(rect),
         geom: Geom::preset(preset),
         style: Some(ShapeStyle::accent(SchemeSlot::Accent1)),
-        click: action.map(|a| Hyperlink { action: a, tooltip: String::new(), highlight_click: true }),
+        click: action.map(|a| Hyperlink { action: a, tooltip: String::new(), highlight_click: true, sound: None, stop_sound: false }),
         ..Default::default()
     };
     let id = add_shape(s, shape, true)?;
diff --git a/crates/model/src/edit.rs b/crates/model/src/edit.rs
index af082b89..2d6d69da 100644
--- a/crates/model/src/edit.rs
+++ b/crates/model/src/edit.rs
@@ -88,7 +88,8 @@ pub fn insert(body: &mut TextBody, pos: Pos, text: &str, props: Option<RunProps>
             let Some(p) = body.paragraphs.get_mut(pi) else { break };
             let idx = split_at(p, ch);
             let tail: Vec<Run> = p.runs.drain(idx..).collect();
-            let newp = Paragraph { level: p.level, props: p.props.clone(), runs: tail, end_props: p.end_props.clone() };
+            let newp =
+                Paragraph { level: p.level, props: p.props.clone(), runs: tail, def_props: p.def_props.clone(), end_props: p.end_props.clone() };
             p.end_props = props.clone();
             body.paragraphs.insert(pi + 1, newp);
             pi += 1;
diff --git a/crates/model/src/resolve.rs b/crates/model/src/resolve.rs
index acaff2b5..a329f291 100644
--- a/crates/model/src/resolve.rs
+++ b/crates/model/src/resolve.rs
@@ -284,16 +284,22 @@ pub fn level_style(ctx: &Ctx, shape: &Shape, level: u8) -> LevelStyle {
 /// Fully resolved run properties for `run` in paragraph `para` (explicit → paragraph style).
 pub fn run(ctx: &Ctx, shape: &Shape, para: &crate::text::Paragraph, run: &RunProps) -> RunProps {
     let mut r = run.clone();
+    // Paragraph `defRPr` fills gaps in the run, and the list style (including the layout
+    // placeholder this shape inherits from) fills whatever is still unset.
+    r.inherit(&para.def_props);
     let lvl = level_style(ctx, shape, para.level);
     r.inherit(&lvl.run);
     // Hyperlinked text is drawn in the theme's hyperlink colour and underlined, as in PowerPoint,
     // unless the run itself sets a colour (honoured since PowerPoint 2019) or an underline
     // (`u="none"` removes it). Colours and underlines from list styles don't count.
     if r.link.is_some() {
-        if run.fill.is_none() {
+        // A colour or underline on the run, or on the same `defRPr` that carries the link, is
+        // kept. A colour that arrived only from a list style is not.
+        let from_def = run.link.is_none();
+        if run.fill.is_none() && !(from_def && para.def_props.fill.is_some()) {
             r.fill = Some(Fill::solid(ColorRef::scheme(SchemeSlot::Hlink)));
         }
-        if run.underline.is_none() {
+        if run.underline.is_none() && !(from_def && para.def_props.underline.is_some()) {
             r.underline = Some("sng".into());
         }
     }
diff --git a/crates/model/src/tests.rs b/crates/model/src/tests.rs
index 2c3b4ced..bac62789 100644
--- a/crates/model/src/tests.rs
+++ b/crates/model/src/tests.rs
@@ -165,7 +165,13 @@ fn hyperlinked_runs_take_the_theme_hyperlink_look() {
     let ctx = Ctx::for_slide(&p, s).unwrap();
     let title = &s.shapes[0];
     let para = Paragraph::default();
-    let link = Some(Hyperlink { action: Action::Url { url: "https://example.org".into() }, tooltip: String::new(), highlight_click: false });
+    let link = Some(Hyperlink {
+        action: Action::Url { url: "https://example.org".into() },
+        tooltip: String::new(),
+        highlight_click: false,
+        sound: None,
+        stop_sound: false,
+    });
     let hlink = Some(Fill::solid(ColorRef::scheme(SchemeSlot::Hlink)));
     // The title's master style colours its text tx1; a link is hlink and underlined instead.
     assert_eq!(resolve::run(&ctx, title, &para, &RunProps::default()).fill, Some(Fill::solid(ColorRef::scheme(SchemeSlot::Tx1))));
@@ -173,7 +179,8 @@ fn hyperlinked_runs_take_the_theme_hyperlink_look() {
     assert_eq!((r.fill, r.underline.as_deref()), (hlink.clone(), Some("sng")));
     assert_eq!(ctx.color(&ColorRef::scheme(SchemeSlot::Hlink), None), p.masters[0].theme.colors.get(SchemeSlot::Hlink));
     // A slide link looks the same.
-    let slide = Some(Hyperlink { action: Action::Slide { slide: s.id }, tooltip: String::new(), highlight_click: false });
+    let slide =
+        Some(Hyperlink { action: Action::Slide { slide: s.id }, tooltip: String::new(), highlight_click: false, sound: None, stop_sound: false });
     assert_eq!(resolve::run(&ctx, title, &para, &RunProps { link: slide, ..Default::default() }).fill, hlink);
     // The run's own colour and underline win; u="none" removes the underline.
     let red = Some(Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 0, 0))));
diff --git a/crates/model/src/text.rs b/crates/model/src/text.rs
index 6a1a7527..eb36f2ce 100644
--- a/crates/model/src/text.rs
+++ b/crates/model/src/text.rs
@@ -295,19 +295,38 @@ pub enum Strike {
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase", tag = "kind")]
 pub enum Action {
-    Url { url: String },
-    Slide { slide: crate::SlideId },
+    Url {
+        url: String,
+    },
+    Slide {
+        slide: crate::SlideId,
+    },
     NextSlide,
     PreviousSlide,
     FirstSlide,
     LastSlide,
     EndShow,
     LastViewed,
-    CustomShow { name: String },
-    Program { path: String },
+    /// Run a custom show. `returns` is PowerPoint's "Show and return".
+    CustomShow {
+        name: String,
+        #[serde(default = "custom_show_returns", skip_serializing_if = "is_true")]
+        returns: bool,
+    },
+    Program {
+        path: String,
+    },
     PlayMedia,
 }
 
+fn custom_show_returns() -> bool {
+    true
+}
+
+fn is_true(v: &bool) -> bool {
+    *v
+}
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Hyperlink {
@@ -316,6 +335,12 @@ pub struct Hyperlink {
     pub tooltip: String,
     #[serde(default)]
     pub highlight_click: bool,
+    /// Sound played when the action runs (`a:snd`).
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub sound: Option<crate::MediaId>,
+    /// `endSnd`: stop the sound that is already playing.
+    #[serde(default, skip_serializing_if = "std::ops::Not::not")]
+    pub stop_sound: bool,
 }
 
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
@@ -448,6 +473,10 @@ pub struct Paragraph {
     #[serde(skip_serializing_if = "is_default_para")]
     pub props: ParaProps,
     pub runs: Vec<Run>,
+    /// `a:defRPr`: defaults for runs in this paragraph that omit a property. Sits above the
+    /// placeholder's list style, so a layout can still supply what this paragraph leaves unset.
+    #[serde(skip_serializing_if = "is_default_props")]
+    pub def_props: RunProps,
     /// Properties of the paragraph end mark (used for an empty paragraph's caret).
     #[serde(skip_serializing_if = "is_default_props")]
     pub end_props: RunProps,
diff --git a/crates/pptx/src/read/dml.rs b/crates/pptx/src/read/dml.rs
index 0aee935c..19e206c2 100644
--- a/crates/pptx/src/read/dml.rs
+++ b/crates/pptx/src/read/dml.rs
@@ -431,7 +431,7 @@ pub fn ppr(imp: &mut Imp, part: &Part, p: &El) -> (Option<u8>, ParaProps, Option
     (lvl, pp, def)
 }
 
-pub fn hyperlink(imp: &Imp, part: &Part, h: &El) -> Option<Hyperlink> {
+pub fn hyperlink(imp: &mut Imp, part: &Part, h: &El) -> Option<Hyperlink> {
     let rid = h.attr("r:id").unwrap_or("");
     let rel = part.rels.get(rid);
     let action = h.attr("action").unwrap_or("");
@@ -450,7 +450,8 @@ pub fn hyperlink(imp: &Imp, part: &Part, h: &El) -> Option<Hyperlink> {
         Action::Slide { slide }
     } else if let Some(q) = action.strip_prefix("ppaction://customshow?") {
         let id = q.split('&').find_map(|kv| kv.strip_prefix("id=")).unwrap_or("0");
-        Action::CustomShow { name: imp.custom_show_names.get(id).cloned().unwrap_or_else(|| id.to_string()) }
+        let returns = !matches!(q.split('&').find_map(|kv| kv.strip_prefix("return=")), Some("false" | "0"));
+        Action::CustomShow { name: imp.custom_show_names.get(id).cloned().unwrap_or_else(|| id.to_string()), returns }
     } else if action.starts_with("ppaction://program") {
         Action::Program { path: rel.map(|r| r.target.clone()).unwrap_or_default() }
     } else if action.starts_with("ppaction://media") {
@@ -470,7 +471,13 @@ pub fn hyperlink(imp: &Imp, part: &Part, h: &El) -> Option<Hyperlink> {
     } else {
         return None;
     };
-    Some(Hyperlink { action: a, tooltip: h.attr("tooltip").unwrap_or("").to_string(), highlight_click: h.bool("highlightClick").unwrap_or(false) })
+    Some(Hyperlink {
+        action: a,
+        tooltip: h.attr("tooltip").unwrap_or("").to_string(),
+        highlight_click: h.bool("highlightClick").unwrap_or(false),
+        stop_sound: h.bool("endSnd").unwrap_or(false),
+        sound: h.child("snd").and_then(|s| media_ref(imp, part, s)),
+    })
 }
 
 pub fn rpr(imp: &mut Imp, part: &Part, r: &El) -> RunProps {
@@ -545,9 +552,12 @@ pub fn paragraph(imp: &mut Imp, part: &Part, p: &El) -> Paragraph {
     for e in p.elements() {
         match e.local() {
             "pPr" => {
-                let (lvl, pp, _) = ppr(imp, part, e);
+                let (lvl, pp, def) = ppr(imp, part, e);
                 para.level = lvl.unwrap_or(0);
                 para.props = pp;
+                if let Some(d) = def {
+                    para.def_props = d;
+                }
             }
             "r" => {
                 let props = e.child("rPr").map(|r| rpr(imp, part, r)).unwrap_or_default();
diff --git a/crates/pptx/src/write/dml.rs b/crates/pptx/src/write/dml.rs
index 16a069fe..8163a95b 100644
--- a/crates/pptx/src/write/dml.rs
+++ b/crates/pptx/src/write/dml.rs
@@ -377,9 +377,10 @@ pub fn hyperlink(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, h: &Hyperlink)
         Action::LastSlide => (String::new(), Some("ppaction://hlinkshowjump?jump=lastslide".into())),
         Action::EndShow => (String::new(), Some("ppaction://hlinkshowjump?jump=endshow".into())),
         Action::LastViewed => (String::new(), Some("ppaction://hlinkshowjump?jump=lastslideviewed".into())),
-        Action::CustomShow { name } => {
+        Action::CustomShow { name, returns } => {
             let id = x.p.custom_shows.iter().position(|c| c.name == *name).unwrap_or(0);
-            (String::new(), Some(format!("ppaction://customshow?id={id}&return=true")))
+            let ret = if *returns { "true" } else { "false" };
+            (String::new(), Some(format!("ppaction://customshow?id={id}&return={ret}")))
         }
         Action::Program { path } => {
             if path.is_empty() {
@@ -389,14 +390,28 @@ pub fn hyperlink(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, h: &Hyperlink)
         }
         Action::PlayMedia => (String::new(), Some("ppaction://media".into())),
     };
-    w.empty(
-        tag,
-        A::new()
-            .a("r:id", rid)
-            .o("action", action)
-            .o("tooltip", (!h.tooltip.is_empty()).then_some(h.tooltip.as_str()))
-            .t("highlightClick", h.highlight_click),
-    );
+    let attrs = A::new()
+        .a("r:id", rid)
+        .o("action", action)
+        .o("tooltip", (!h.tooltip.is_empty()).then_some(h.tooltip.as_str()))
+        .t("highlightClick", h.highlight_click)
+        .t("endSnd", h.stop_sound);
+    let sound = h.sound.and_then(|id| x.media_rel(o, id, "audio").map(|rid| (rid, id)));
+    let Some((sound_rid, sound_id)) = sound else {
+        w.empty(tag, attrs);
+        return;
+    };
+    w.open(tag, attrs);
+    let name = x.p.media(sound_id).map(|m| sound_label(&m.name)).unwrap_or_else(|| "sound.wav".into());
+    w.empty("a:snd", A::new().a("r:embed", sound_rid).a("name", name));
+    w.close(tag);
+}
+
+/// Display name PowerPoint stores on `a:snd`.
+fn sound_label(name: &str) -> String {
+    let file = name.rsplit(['/', '\\']).next().unwrap_or(name);
+    let label: String = file.chars().filter(|c| c.is_ascii() && !c.is_control() && *c != '"' && *c != '<' && *c != '>').take(80).collect();
+    if label.is_empty() { "sound.wav".into() } else { label }
 }
 
 pub fn body_pr(w: &mut W, b: &BodyProps) {
@@ -677,8 +692,9 @@ fn run_text(w: &mut W, x: &mut Exp, o: &mut Out, text: &str, props: &RunProps) {
 
 pub fn paragraph(w: &mut W, x: &mut Exp, o: &mut Out, p: &Paragraph, math: bool, index: usize) {
     w.open0("a:p");
-    if p.level > 0 || !is_default_ppr(&p.props) {
-        ppr(w, x, o, "a:pPr", Some(p.level), &p.props, None);
+    let def = (p.def_props != RunProps::default()).then_some(&p.def_props);
+    if p.level > 0 || !is_default_ppr(&p.props) || def.is_some() {
+        ppr(w, x, o, "a:pPr", Some(p.level), &p.props, def);
     }
     for (ri, r) in p.runs.iter().enumerate() {
         match &r.kind {
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..68718779 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -582,6 +582,8 @@ fn media(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape, m: &deckcraft_
             action: deckcraft_model::text::Action::PlayMedia,
             tooltip: String::new(),
             highlight_click: false,
+            sound: None,
+            stop_sound: false,
         });
     }
     cnvpr(w, x, o, id, &s2);
diff --git a/crates/pptx/tests/corpus_elements.rs b/crates/pptx/tests/corpus_elements.rs
new file mode 100644
index 00000000..48296cb0
--- /dev/null
+++ b/crates/pptx/tests/corpus_elements.rs
@@ -0,0 +1,283 @@
+//! Owned round trip: comments, hyperlinks and actions, custom shows, grouped
+//! rotated objects, and placeholders that inherit from the layout.
+//!
+//! Embedded fonts stay out of this check; another open change owns that part.
+
+use std::sync::Arc;
+
+use deckcraft_color::Rgba;
+use deckcraft_geom::Xfrm;
+use deckcraft_model::style::{ColorRef, Fill};
+use deckcraft_model::text::{Action, Hyperlink, LevelStyle, ListStyle, Paragraph, Run, RunProps, TextBody};
+use deckcraft_model::{Comment, CustomShow, Geom, LayoutType, PhType, Presentation, Shape, ShapeId, ShapeKind, defaults, resolve};
+
+const CHIME: &[u8] = b"RIFFdeckcraft-chime-WAVEfmt ";
+
+fn link(action: Action) -> Hyperlink {
+    Hyperlink { action, tooltip: String::new(), highlight_click: false, sound: None, stop_sound: false }
+}
+
+fn box_at(p: &mut Presentation, name: &str, x: f64, y: f64) -> Shape {
+    Shape { id: ShapeId(p.alloc_id()), name: name.into(), xfrm: Some(Xfrm::new(x, y, 80.0, 28.0)), ..Default::default() }
+}
+
+fn round(p: &Presentation) -> Presentation {
+    deckcraft_pptx::import(&deckcraft_pptx::export(p).expect("export")).expect("import")
+}
+
+fn shape<'a>(p: &'a Presentation, slide: usize, name: &str) -> &'a Shape {
+    p.slides[slide].shapes.iter().find(|s| s.name == name).unwrap_or_else(|| panic!("missing {name}"))
+}
+
+fn placeholder(p: &Presentation, kind: PhType) -> &Shape {
+    p.slides[0].shapes.iter().find(|s| s.ph_type() == Some(kind)).unwrap_or_else(|| panic!("missing {kind:?}"))
+}
+
+fn deck() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let layout = defaults::layout_of_kind(&p, LayoutType::TitleAndContent).expect("layout");
+    let master = Arc::make_mut(&mut p.masters[0]);
+    let lay = master.layouts.iter_mut().find(|l| l.id == layout).expect("layout");
+    for s in &mut lay.shapes {
+        if s.ph_type() != Some(PhType::Obj) {
+            continue;
+        }
+        s.xfrm = Some(Xfrm::new(48.0, 120.0, 600.0, 300.0));
+        s.geom = Geom::preset("ellipse");
+        s.fill = Some(Fill::solid(ColorRef::rgb(Rgba::rgb(20, 40, 80))));
+        let mut ls = ListStyle::default();
+        ls.set(0, LevelStyle { run: RunProps { size: Some(28.0), font: Some("Source Serif 4".into()), ..Default::default() }, ..Default::default() });
+        let body = s.text.get_or_insert_with(TextBody::default);
+        body.list_style = ls;
+    }
+
+    let chime = p.add_media("chime.wav", "audio/wav", CHIME.to_vec());
+    let mut a = defaults::new_slide(&mut p, layout);
+    a.name = "Review".into();
+    if let Some(title) = a.shapes.iter_mut().find(|s| s.ph_type() == Some(PhType::Title)) {
+        title.text = Some(TextBody::from_text("Review"));
+    }
+    if let Some(body) = a.shapes.iter_mut().find(|s| s.ph_type() == Some(PhType::Obj)) {
+        body.text = Some(TextBody {
+            paragraphs: vec![
+                Paragraph {
+                    runs: vec![Run::new("Quoted")],
+                    def_props: RunProps {
+                        size: Some(22.0),
+                        bold: Some(true),
+                        font: Some("Literata".into()),
+                        link: Some(Hyperlink {
+                            action: Action::Url { url: "https://example.com/quote".into() },
+                            tooltip: "Source".into(),
+                            highlight_click: false,
+                            sound: None,
+                            stop_sound: false,
+                        }),
+                        ..Default::default()
+                    },
+                    ..Default::default()
+                },
+                Paragraph { runs: vec![Run::new("Inherits")], ..Default::default() },
+            ],
+            ..Default::default()
+        });
+    }
+    let mut gem = box_at(&mut p, "Gem", 12.0, 18.0);
+    gem.xfrm = Some(Xfrm { x: 12.0, y: 18.0, w: 80.0, h: 40.0, rot: 20.0, flip_v: true, ..Default::default() });
+    gem.text = Some(TextBody::from_text("Tilted"));
+    let mut cluster = box_at(&mut p, "Cluster", 80.0, 40.0);
+    cluster.xfrm = Some(Xfrm { x: 80.0, y: 40.0, w: 220.0, h: 140.0, rot: 25.0, flip_h: true, ..Default::default() });
+    cluster.kind = ShapeKind::Group { children: vec![gem], child: Xfrm::new(10.0, 20.0, 400.0, 240.0) };
+    a.shapes.push(cluster);
+
+    let mut site = box_at(&mut p, "Site", 40.0, 460.0);
+    site.click = Some(Hyperlink {
+        action: Action::Url { url: "https://example.com/deck".into() },
+        tooltip: "Example".into(),
+        highlight_click: true,
+        sound: None,
+        stop_sound: false,
+    });
+    a.shapes.push(site);
+
+    a.shapes.push(box_at(&mut p, "Go second", 140.0, 460.0));
+
+    for (name, x, action) in [
+        ("Next", 240.0, Action::NextSlide),
+        ("End", 330.0, Action::EndShow),
+        ("Back", 420.0, Action::LastViewed),
+        ("Last", 510.0, Action::LastSlide),
+        ("Open file", 600.0, Action::Program { path: "Talk notes.txt".into() }),
+        ("Play clip", 700.0, Action::PlayMedia),
+    ] {
+        let mut s = box_at(&mut p, name, x, 500.0);
+        s.click = Some(link(action));
+        a.shapes.push(s);
+    }
+
+    let mut hover = box_at(&mut p, "Hover", 40.0, 500.0);
+    hover.hover =
+        Some(Hyperlink { action: Action::PreviousSlide, tooltip: "Back one".into(), highlight_click: false, sound: None, stop_sound: true });
+    a.shapes.push(hover);
+
+    let mut home = box_at(&mut p, "Home", 800.0, 460.0);
+    home.geom = Geom::preset("actionButtonHome");
+    home.click = Some(Hyperlink { action: Action::FirstSlide, tooltip: String::new(), highlight_click: true, sound: None, stop_sound: false });
+    a.shapes.push(home);
+
+    let mut board = box_at(&mut p, "To board", 140.0, 500.0);
+    board.click = Some(Hyperlink {
+        action: Action::CustomShow { name: "Board".into(), returns: false },
+        tooltip: "Open the board show".into(),
+        highlight_click: false,
+        sound: Some(chime),
+        stop_sound: false,
+    });
+    a.shapes.push(board);
+
+    let mut short = box_at(&mut p, "To short", 240.0, 500.0);
+    short.click = Some(link(Action::CustomShow { name: "Short".into(), returns: true }));
+    a.shapes.push(short);
+
+    a.comments = vec![Comment {
+        author: "Mina".into(),
+        initials: "ML".into(),
+        text: "Check the quote".into(),
+        date: "2026-03-01T09:30:00.000".into(),
+        x: 36.0,
+        y: 48.0,
+        ..Default::default()
+    }];
+
+    let mut b = defaults::new_slide(&mut p, layout);
+    if let Some(title) = b.shapes.iter_mut().find(|s| s.ph_type() == Some(PhType::Title)) {
+        title.text = Some(TextBody::from_text("Second"));
+    }
+    // The jump is filled in once this slide has an id.
+    let b_id = b.id;
+    if let Some(go) = a.shapes.iter_mut().find(|s| s.name == "Go second") {
+        go.click = Some(link(Action::Slide { slide: b_id }));
+    }
+    p.slides = vec![Arc::new(a), Arc::new(b)];
+    let ids: Vec<_> = p.slides.iter().map(|s| s.id).collect();
+    p.custom_shows =
+        vec![CustomShow { name: "Short".into(), slides: vec![ids[0]] }, CustomShow { name: "Board".into(), slides: vec![ids[1], ids[0]] }];
+    p.show.custom_show = Some("Board".into());
+    p
+}
+
+fn assert_deck(q: &Presentation) {
+    assert_eq!(q.slides.len(), 2);
+    assert_eq!(placeholder(q, PhType::Title).text.as_ref().map(|t| t.text()), Some("Review".into()));
+
+    let body = placeholder(q, PhType::Obj);
+    assert!(body.xfrm.is_none(), "a placeholder with no box of its own keeps inheriting the layout");
+    assert!(matches!(&body.geom, Geom::Preset { name, .. } if name == "ellipse"), "layout geometry: {:?}", body.geom);
+    let ctx = resolve::Ctx::for_slide(q, &q.slides[0]).expect("ctx");
+    let x = resolve::xfrm(&ctx, body);
+    assert_eq!((x.x, x.y, x.w, x.h), (48.0, 120.0, 600.0, 300.0));
+    let (fill, _) = resolve::fill(&ctx, body);
+    assert_eq!(fill, Some(Fill::solid(ColorRef::rgb(Rgba::rgb(20, 40, 80)))));
+
+    let paras = &body.text.as_ref().expect("text").paragraphs;
+    assert_eq!(paras[0].runs[0].text, "Quoted");
+    assert!(paras[0].runs[0].props.size.is_none(), "the run itself stays unset");
+    assert_eq!(paras[0].def_props.size, Some(22.0));
+    assert_eq!(paras[0].def_props.bold, Some(true));
+    assert_eq!(paras[0].def_props.font.as_deref(), Some("Literata"));
+    match &paras[0].def_props.link {
+        Some(h) => match &h.action {
+            Action::Url { url } => assert_eq!(url, "https://example.com/quote"),
+            other => panic!("paragraph link: {other:?}"),
+        },
+        None => panic!("paragraph default run lost its link"),
+    }
+    assert_eq!(paras[0].def_props.link.as_ref().map(|h| h.tooltip.as_str()), Some("Source"));
+    let quoted = resolve::run(&ctx, body, &paras[0], &paras[0].runs[0].props);
+    assert_eq!(quoted.size, Some(22.0));
+    assert_eq!(paras[1].runs[0].text, "Inherits");
+    let inherited = resolve::run(&ctx, body, &paras[1], &paras[1].runs[0].props);
+    assert_eq!(inherited.size, Some(28.0), "the second paragraph takes the layout list style");
+    assert_eq!(inherited.font.as_deref(), Some("Source Serif 4"));
+
+    let cluster = shape(q, 0, "Cluster");
+    let g = cluster.xfrm.expect("group box");
+    assert_eq!((g.x, g.y, g.w, g.h, g.rot, g.flip_h), (80.0, 40.0, 220.0, 140.0, 25.0, true));
+    let ShapeKind::Group { children, child } = &cluster.kind else { panic!("not a group") };
+    assert_eq!((child.x, child.y, child.w, child.h), (10.0, 20.0, 400.0, 240.0));
+    let gem = &children[0];
+    assert_eq!(gem.text.as_ref().map(|t| t.text()), Some("Tilted".into()));
+    let gx = gem.xfrm.expect("gem");
+    assert_eq!((gx.x, gx.y, gx.w, gx.h, gx.rot, gx.flip_v), (12.0, 18.0, 80.0, 40.0, 20.0, true));
+
+    let c = &q.slides[0].comments;
+    assert_eq!(c.len(), 1);
+    assert_eq!((c[0].author.as_str(), c[0].initials.as_str(), c[0].text.as_str()), ("Mina", "ML", "Check the quote"));
+    assert_eq!(c[0].date, "2026-03-01T09:30:00.000");
+    assert_eq!((c[0].x, c[0].y), (36.0, 48.0));
+
+    let click = |name: &str| shape(q, 0, name).click.clone().unwrap_or_else(|| panic!("{name} lost its click"));
+    match click("Site").action {
+        Action::Url { url } => assert_eq!(url, "https://example.com/deck"),
+        other => panic!("{other:?}"),
+    }
+    assert_eq!(click("Site").tooltip, "Example");
+    assert!(click("Site").highlight_click);
+    match click("Go second").action {
+        Action::Slide { slide } => assert_eq!(q.slides.iter().position(|s| s.id == slide), Some(1)),
+        other => panic!("{other:?}"),
+    }
+    assert!(matches!(click("Next").action, Action::NextSlide));
+    assert!(matches!(click("End").action, Action::EndShow));
+    assert!(matches!(click("Back").action, Action::LastViewed));
+    assert!(matches!(click("Last").action, Action::LastSlide));
+    match click("Open file").action {
+        Action::Program { path } => assert_eq!(path, "Talk notes.txt"),
+        other => panic!("{other:?}"),
+    }
+    assert!(matches!(click("Play clip").action, Action::PlayMedia));
+    assert!(matches!(click("Home").action, Action::FirstSlide));
+    assert!(click("Home").highlight_click);
+    assert!(matches!(shape(q, 0, "Home").geom, Geom::Preset { ref name, .. } if name == "actionButtonHome"));
+    let hover = shape(q, 0, "Hover").hover.clone().expect("hover");
+    assert!(matches!(hover.action, Action::PreviousSlide));
+    assert!(hover.stop_sound);
+    assert_eq!(hover.tooltip, "Back one");
+
+    match click("To board").action {
+        Action::CustomShow { name, returns } => {
+            assert_eq!(name, "Board");
+            assert!(!returns, "Show and return was forced on");
+        }
+        other => panic!("{other:?}"),
+    }
+    let snd = click("To board").sound.expect("action sound");
+    assert_eq!(q.media(snd).map(|m| m.data.as_ref().clone()).as_deref(), Some(CHIME));
+    match click("To short").action {
+        Action::CustomShow { name, returns } => {
+            assert_eq!(name, "Short");
+            assert!(returns);
+        }
+        other => panic!("{other:?}"),
+    }
+
+    assert_eq!(q.custom_shows.len(), 2);
+    assert_eq!(q.custom_shows[0].name, "Short");
+    assert_eq!(q.custom_shows[0].slides, vec![q.slides[0].id]);
+    assert_eq!(q.custom_shows[1].name, "Board");
+    assert_eq!(q.custom_shows[1].slides, vec![q.slides[1].id, q.slides[0].id]);
+    assert_eq!(q.show.custom_show.as_deref(), Some("Board"));
+    assert_eq!(
+        q.slides[1].shapes.iter().find(|s| s.ph_type() == Some(PhType::Title)).and_then(|s| s.text.as_ref()).map(|t| t.text()),
+        Some("Second".into())
+    );
+}
+
+#[test]
+fn comments_links_shows_groups_and_inherited_placeholders_round_trip() {
+    let p = deck();
+    let once = round(&p);
+    assert_deck(&once);
+    let twice = round(&once);
+    assert_deck(&twice);
+}
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..ca0079e4 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -82,6 +82,8 @@ pub fn rich_deck() -> Presentation {
                                 action: Action::Url { url: "https://example.org/a?b=1&c=2".into() },
                                 tooltip: "tip".into(),
                                 highlight_click: false,
+                                sound: None,
+                                stop_sound: false,
                             }),
                             ..Default::default()
                         },
@@ -153,7 +155,7 @@ pub fn rich_deck() -> Presentation {
         }],
         ..Default::default()
     });
-    b.click = Some(Hyperlink { action: Action::NextSlide, tooltip: String::new(), highlight_click: true });
+    b.click = Some(Hyperlink { action: Action::NextSlide, tooltip: String::new(), highlight_click: true, sound: None, stop_sound: false });
     let mut c = shape(&mut p, "Freeform", 450.0, 120.0, 100.0, 100.0);
     c.geom = Geom::Custom {
         paths: vec![CustomPath {
@@ -336,7 +338,8 @@ pub fn rich_deck() -> Presentation {
     let target = p.slides[1].id;
     let mut link = shape(&mut p, "Go to shapes", 600.0, 450.0, 200.0, 40.0);
     link.text = Some(TextBody::from_text("Back to shapes"));
-    link.click = Some(Hyperlink { action: Action::Slide { slide: target }, tooltip: String::new(), highlight_click: false });
+    link.click =
+        Some(Hyperlink { action: Action::Slide { slide: target }, tooltip: String::new(), highlight_click: false, sound: None, stop_sound: false });
     let mut eq = shape(&mut p, "Equation", 100.0, 450.0, 300.0, 40.0);
     eq.text = Some(TextBody {
         paragraphs: vec![Paragraph {
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..10963210 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -539,7 +539,13 @@ fn hyperlinks_draw_in_the_hyperlink_colour_underlined() {
     let o = RenderOpts { scale: 0.5, ..Default::default() };
     let px = |p: &Presentation| render_slide(p, 0, &o);
     let diff = |a: &Image, b: &Image| a.pixels.iter().zip(&b.pixels).filter(|(x, y)| x.abs_diff(**y) > 64).count();
-    let link = Some(Hyperlink { action: Action::Url { url: "https://example.org".into() }, tooltip: String::new(), highlight_click: false });
+    let link = Some(Hyperlink {
+        action: Action::Url { url: "https://example.org".into() },
+        tooltip: String::new(),
+        highlight_click: false,
+        sound: None,
+        stop_sound: false,
+    });
     let hlink = Some(Fill::solid(ColorRef::scheme(deckcraft_color::SchemeSlot::Hlink)));
     let red = Some(Fill::solid(ColorRef::rgb(Rgba::rgb(200, 0, 0))));
     let _ = px(&run_deck(RunProps::default())); // faces load lazily
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..2749c61d 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus for comments, links and actions, custom shows, rotated groups and inherited placeholders; paragraph `defRPr` and action sounds kept; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -16,7 +16,7 @@ PowerPoint opens and saves; Viewer = opens only).
 
 | Format | PowerPoint | DeckCraft read | DeckCraft write | Fidelity / notes | Tested by |
 |---|---|---|---|---|---|
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); never measured on real decks | `crates/pptx/tests/roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs` (30 tests); opened in PowerPoint by hand 2026-10-06 |
+| `.pptx` presentation | Editor | yes | yes | Broad (see below); an owned corpus covers comments, links and actions, custom shows, rotated groups and placeholders that inherit from the layout. Embedded fonts and a corpus of decks from outside this repo are still open | `crates/pptx/tests/roundtrip.rs`, `corpus_elements.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
 | `.potx` template | Editor | yes (as a presentation) | no: written with the `.pptx` content type | `file.saveTemplate` is Save As under another name | none |
 | `.ppsx` slide show | Editor | yes (as a presentation) | no: written as `.pptx` content | Doesn't start in show mode | none |
 | `.pptm` / `.potm` / `.ppsm` macro-enabled | Editor | no | no | Should open and keep `vbaProject.bin` without running it | none |
@@ -68,7 +68,7 @@ the round trip even though DeckCraft doesn't model it.
 | Lines: dash, compound, caps, joins, arrowheads | yes | yes | |
 | Effects: shadow, glow, soft edges, reflection | yes | yes | |
 | 3-D: `scene3d`, `sp3d` | kept | kept | Not rendered |
-| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow` and date fields |
+| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow`, date fields and paragraph `defRPr` (the defaults a placeholder's runs inherit, including a link). A click or hover action keeps its sound, `endSnd`, and a custom show's "Show and return" |
 | Text warp (`prstTxWarp`) | yes | yes | All 40 presets rendered (`crates/geom/src/warp.rs`); adjust values (`avLst`) round-trip |
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Owned corpus for comments, links and actions, custom shows, rotated groups and inherited placeholders. Paragraph `defRPr` and action sounds (including custom-show return) survive a save |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..b28d687d 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned PPTX corpus for comments, links, custom shows, groups and inherited placeholders; paragraph defaults and action sounds kept; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -59,9 +59,14 @@ revision history.
 Detail in [file-format-parity.md](file-format-parity.md).
 
 ### PPTX has never met a corpus of real decks
-- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests) uses decks DeckCraft generates;
-  the 2026-10-07 alpha checklist already listed this as open. No reference renders from PowerPoint
-  exist to compare against.
+- **Evidence:** PPTX tests use decks DeckCraft generates. An owned check
+  (`crates/pptx/tests/corpus_elements.rs`) now opens, saves and reopens comments, hyperlinks and
+  actions, custom shows, grouped rotated objects, and placeholders that inherit position, geometry
+  and text from the layout. That check found paragraph default run properties (`defRPr`, including
+  a link) and action sounds (the sound itself, stop-previous, and a custom show's "Show and
+  return") were dropped on save; they are kept now. Embedded fonts, comment threads (#70), media
+  options (#74) and animation rewind (#77) are still open, and there is no corpus of decks from
+  outside this repo. No reference renders from PowerPoint exist to compare against.
 - **Impact:** the main reason to switch is "open my PowerPoint decks". Fidelity on real decks
   (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is unknown.
 - **Estimate:** 20–35 h: build an owned corpus in `storytold/photocraft-corpus` style (craftrules
@@ -256,6 +261,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Owned PPTX corpus for comments, links and actions, custom shows, rotated groups and inherited placeholders. Paragraph `defRPr` and action sounds kept. Embedded fonts and #70/#74/#77 stay open |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..ed964f78 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus covers comments, links, custom shows, groups and inherited placeholders; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -26,8 +26,10 @@ points and lead the beta plan.
 
 1. **Stop losing work and crashing:** land Close's save prompt (#60, PR #75), the Windows GPU
    startup crashes (#40, #59), image paste on Windows/Linux (#53). 6–12 h.
-2. **PPTX on real decks:** build an owned corpus, round-trip checks in CI, fix what breaks;
-   comment threads, media options and rewind on save (#70, #74, #77); EMF/WMF and SVG. 31–55 h.
+2. **PPTX on real decks:** the owned corpus now round-trips comments, hyperlinks and actions,
+   custom shows, grouped rotated objects, and placeholders that inherit from the layout, and keeps
+   paragraph default formatting and action sounds. Still open: a larger corpus, embedded fonts,
+   comment threads, media options and rewind (#70, #74, #77), EMF/WMF and SVG. 31–55 h.
 3. **Review the open PRs:** equations (#55), browser print (#66), Morph alignment (#67), macOS
    open-with (#68), font lookup (#80), Ukrainian (#34, after the catalog exists). 4–8 h.
 
@@ -96,7 +98,7 @@ on common paths. On 2026-10-07 it was ~80% there with these blockers:
 | Blocker (2026-10-07) | Status 2026-10-10 |
 |---|---|
 | First real release run: signing, notarization, installers verified on each OS | Signed releases v0.1.0–v0.4.0 published; installers not hand-checked on each OS; Windows startup crashes on some GPUs (#40, #59) |
-| PPTX fidelity on a corpus of real decks | Still open; now beta item 2 |
+| PPTX fidelity on a corpus of real decks | Owned check for comments, links, custom shows, groups and inherited placeholders. A larger corpus, embedded fonts and #70/#74/#77 stay open; beta item 2 |
 | Presenter view and Animation Pane polish | Still open; beta items 9 and 10 |
 | Soak and fuzz the editor | Still open; beta item 1 |
 | UI fidelity pass on the most-used ribbon groups and dialogs; first run | Partly (start-screen fixes #20, #49); beta item 11 |
@@ -109,5 +111,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Owned PPTX corpus covers comments, links and actions, custom shows, rotated groups and inherited placeholders. Beta item 2 stays open for a larger corpus, embedded fonts and #70/#74/#77 |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |

From 4ba7deb5ff19dfcc307d27643e74925a9b42a695 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:44:40 +0300
Subject: [PATCH 185/376] Text: Find and Replace across slides, tables and
 notes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Adds text.find (match case, whole words; matches in shape text, table
cells and speaker notes) and text.replace (one match or all, as one
undo step, keeping the first run's formatting). Home gets Find and
Replace buttons, Ctrl+F / Ctrl+H and Edit › Find… / Replace… open a
Find and Replace dialog that steps through matches slide by slide.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/find.rs | 240 ++++++++++++++++++++++++++++++++++
 crates/engine/src/cmd/mod.rs  |   2 +
 crates/engine/src/tests.rs    |  26 ++++
 crates/ui-egui/src/dialogs.rs |  81 ++++++++++++
 crates/ui-egui/src/lib.rs     |   8 ++
 crates/ui-egui/src/menus.rs   |   9 +-
 crates/ui-egui/src/ribbon.rs  |   6 +
 docs/ui-parity.md             |   4 +-
 8 files changed, 369 insertions(+), 7 deletions(-)
 create mode 100644 crates/engine/src/cmd/find.rs

diff --git a/crates/engine/src/cmd/find.rs b/crates/engine/src/cmd/find.rs
new file mode 100644
index 00000000..4991cd1f
--- /dev/null
+++ b/crates/engine/src/cmd/find.rs
@@ -0,0 +1,240 @@
+//! Home › Editing: Find and Replace across slide text, table cells and speaker notes.
+
+use std::sync::Arc;
+
+use deckcraft_model::text::RunKind;
+use deckcraft_model::{Paragraph, Shape, ShapeKind, Slide, TextBody};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{Result, Session};
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![
+        cmd!(
+            query "text.find",
+            "Find",
+            ["Home", "Editing"],
+            None,
+            "{text, matchCase?: bool, wholeWords?: bool} → [{slide, shape (null = notes), cell?: [row, col], para, start, end}] (char offsets in the paragraph)",
+            has_doc,
+            find
+        ),
+        cmd!(
+            "text.replace",
+            "Replace",
+            ["Home", "Editing"],
+            None,
+            "{text, with, matchCase?, wholeWords?, at?: a text.find match (replace just that one; default: replace all)} → {replaced}",
+            has_doc,
+            replace
+        ),
+    ]
+}
+
+/// Where a text body lives on a slide.
+#[derive(Clone, Copy, PartialEq, Debug)]
+struct Loc {
+    shape: Option<u64>,
+    cell: Option<(usize, usize)>,
+}
+
+/// Visit every text body on a slide: shapes depth-first (groups, table cells), then the notes.
+fn bodies(slide: &mut Slide, f: &mut dyn FnMut(Loc, &mut TextBody)) {
+    fn rec(shapes: &mut [Shape], depth: usize, f: &mut dyn FnMut(Loc, &mut TextBody)) {
+        if depth > 64 {
+            return;
+        }
+        for sh in shapes {
+            let id = Some(u64::from(sh.id.0));
+            if let Some(t) = &mut sh.text {
+                f(Loc { shape: id, cell: None }, t);
+            }
+            match &mut sh.kind {
+                ShapeKind::Table(t) => {
+                    for (r, row) in t.rows.iter_mut().enumerate() {
+                        for (c, cell) in row.cells.iter_mut().enumerate() {
+                            f(Loc { shape: id, cell: Some((r, c)) }, &mut cell.text);
+                        }
+                    }
+                }
+                ShapeKind::Group { children, .. } => rec(children, depth + 1, f),
+                _ => {}
+            }
+        }
+    }
+    rec(&mut slide.shapes, 0, f);
+    f(Loc { shape: None, cell: None }, &mut slide.notes);
+}
+
+struct Opts {
+    pat: Vec<char>,
+    case: bool,
+    whole: bool,
+}
+
+impl Opts {
+    fn from(p: &Value, cmd: &str) -> Result<Self> {
+        let pat: Vec<char> = str_param(p, "text").unwrap_or("").chars().collect();
+        if pat.is_empty() {
+            return Err(bad(cmd, "missing `text`"));
+        }
+        Ok(Opts { pat, case: bool_or(p, "matchCase", false), whole: bool_or(p, "wholeWords", false) })
+    }
+    fn eq(&self, a: char, b: char) -> bool {
+        a == b || (!self.case && a.to_lowercase().eq(b.to_lowercase()))
+    }
+    /// Non-overlapping matches as char ranges.
+    fn matches(&self, text: &[char]) -> Vec<(usize, usize)> {
+        let n = self.pat.len();
+        let word = |c: Option<&char>| c.is_some_and(|c| c.is_alphanumeric() || *c == '_');
+        let mut out = vec![];
+        let mut i = 0;
+        while i + n <= text.len() {
+            let hit = text[i..i + n].iter().zip(&self.pat).all(|(a, b)| self.eq(*a, *b))
+                && (!self.whole || (!word(i.checked_sub(1).and_then(|j| text.get(j))) && !word(text.get(i + n))));
+            if hit {
+                out.push((i, i + n));
+                i += n;
+            } else {
+                i += 1;
+            }
+        }
+        out
+    }
+}
+
+fn para_chars(p: &Paragraph) -> Vec<char> {
+    p.runs.iter().flat_map(|r| r.text.chars()).collect()
+}
+
+/// Matches that lie wholly in plain text runs (never inside a field, equation or break).
+fn para_matches(p: &Paragraph, o: &Opts) -> Vec<(usize, usize)> {
+    let mut spans = vec![];
+    let mut off = 0;
+    for r in &p.runs {
+        let n = r.text.chars().count();
+        spans.push((off, off + n, matches!(r.kind, RunKind::Text)));
+        off += n;
+    }
+    o.matches(&para_chars(p)).into_iter().filter(|&(a, b)| spans.iter().all(|&(s, e, text)| text || e <= a || s >= b || s == e)).collect()
+}
+
+/// Replace chars `a..b` of the paragraph; the replacement takes the first run's formatting.
+fn splice(p: &mut Paragraph, a: usize, b: usize, with: &str) {
+    let mut off = 0;
+    let mut placed = false;
+    for r in &mut p.runs {
+        let chars: Vec<char> = r.text.chars().collect();
+        let (s, e) = (off, off + chars.len());
+        off = e;
+        if e <= a || s >= b {
+            continue;
+        }
+        let keep_head: String = chars[..a.saturating_sub(s)].iter().collect();
+        let keep_tail: String = chars[b.saturating_sub(s).min(chars.len())..].iter().collect();
+        r.text = if placed { keep_tail } else { format!("{keep_head}{with}{keep_tail}") };
+        placed = true;
+    }
+    if p.runs.len() > 1 {
+        p.runs.retain(|r| !(r.text.is_empty() && matches!(r.kind, RunKind::Text)));
+    }
+}
+
+fn find(s: &mut Session, p: &Value) -> Result<Value> {
+    let o = Opts::from(p, "text.find")?;
+    let st = s.doc()?;
+    let mut out = vec![];
+    for (i, sl) in st.doc.slides.iter().enumerate() {
+        let mut sl = (**sl).clone();
+        bodies(&mut sl, &mut |loc, t| {
+            for (pi, para) in t.paragraphs.iter().enumerate() {
+                for (a, b) in para_matches(para, &o) {
+                    out.push(json!({"slide": i, "shape": loc.shape, "cell": loc.cell.map(|(r, c)| [r, c]), "para": pi, "start": a, "end": b}));
+                }
+            }
+        });
+    }
+    Ok(Value::Array(out))
+}
+
+fn replace(s: &mut Session, p: &Value) -> Result<Value> {
+    let o = Opts::from(p, "text.replace")?;
+    let with = str_param(p, "with").unwrap_or("").to_string();
+    let at = p.get("at").filter(|v| v.is_object()).map(|v| -> Result<(usize, Loc, usize, usize)> {
+        let n = |k: &str| v.get(k).and_then(Value::as_u64).map(|x| x as usize).ok_or_else(|| bad("text.replace", format!("`at` needs `{k}`")));
+        let cell = v.get("cell").and_then(Value::as_array).and_then(|c| Some((c.first()?.as_u64()? as usize, c.get(1)?.as_u64()? as usize)));
+        Ok((n("slide")?, Loc { shape: v.get("shape").and_then(Value::as_u64), cell }, n("para")?, n("start")?))
+    });
+    let at = at.transpose()?;
+    let count = s.edit(|doc, _| {
+        let mut count = 0;
+        for (i, slp) in doc.slides.iter_mut().enumerate() {
+            if at.is_some_and(|a| a.0 != i) {
+                continue;
+            }
+            let mut sl = (**slp).clone();
+            let mut changed = 0;
+            bodies(&mut sl, &mut |loc, t| {
+                if at.is_some_and(|a| a.1 != loc) {
+                    return;
+                }
+                for (pi, para) in t.paragraphs.iter_mut().enumerate() {
+                    if at.is_some_and(|a| a.2 != pi) {
+                        continue;
+                    }
+                    for (a, b) in para_matches(para, &o).into_iter().rev() {
+                        if at.is_some_and(|x| x.3 != a) {
+                            continue;
+                        }
+                        splice(para, a, b, &with);
+                        changed += 1;
+                    }
+                }
+            });
+            if changed > 0 {
+                *slp = Arc::new(sl);
+                count += changed;
+            }
+        }
+        if count == 0 {
+            return Err(bad("text.replace", "no matches"));
+        }
+        Ok(count)
+    })?;
+    Ok(json!({"replaced": count}))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use deckcraft_model::{Run, RunProps};
+
+    fn opts(t: &str, case: bool, whole: bool) -> Opts {
+        Opts { pat: t.chars().collect(), case, whole }
+    }
+
+    #[test]
+    fn matching_honours_case_and_whole_words() {
+        let t: Vec<char> = "Cat cat category".chars().collect();
+        assert_eq!(opts("cat", false, false).matches(&t).len(), 3);
+        assert_eq!(opts("cat", true, false).matches(&t).len(), 2);
+        assert_eq!(opts("cat", false, true).matches(&t), vec![(0, 3), (4, 7)]);
+    }
+
+    #[test]
+    fn splice_across_runs_keeps_the_first_runs_format() {
+        let bold = RunProps { bold: Some(true), ..Default::default() };
+        let mut p = Paragraph {
+            runs: vec![
+                Run { text: "Hel".into(), props: bold.clone(), kind: RunKind::Text },
+                Run { text: "lo world".into(), props: RunProps::default(), kind: RunKind::Text },
+            ],
+            ..Default::default()
+        };
+        splice(&mut p, 1, 5, "ola");
+        assert_eq!(para_chars(&p).iter().collect::<String>(), "Hola world");
+        assert_eq!(p.runs[0].text, "Hola");
+        assert_eq!(p.runs[0].props, bold);
+    }
+}
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..7e0b7e36 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -5,6 +5,7 @@ pub mod arrange;
 pub mod design;
 pub mod edit;
 pub mod file;
+pub mod find;
 pub mod format;
 pub mod insert;
 pub mod inspect;
@@ -139,6 +140,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(transition::specs());
         v.extend(animation::specs());
         v.extend(table::specs());
+        v.extend(find::specs());
         v.extend(review::specs());
         v.extend(inspect::specs());
         v.extend(media::specs());
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..e02bc740 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,29 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn find_and_replace_across_shapes_and_notes() {
+    let mut s = session();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100], "text": "Old plan, old team\nboldly"})).unwrap();
+    s.execute("slide.notes", &json!({"text": "Discuss the old plan"})).unwrap();
+    let q = json!({"text": "old"});
+    let found = s.execute("text.find", &q).unwrap();
+    let n = found.as_array().unwrap().len();
+    assert!(n >= 3, "{found}");
+    let whole = s.execute("text.find", &json!({"text": "old", "wholeWords": true, "matchCase": true})).unwrap();
+    assert_eq!(whole.as_array().unwrap().len(), n - 2, "Old and boldly are not whole lower-case matches");
+
+    let first = found[0].clone();
+    assert_eq!((first["para"].as_u64(), first["start"].as_u64()), (Some(0), Some(0)));
+    s.execute("text.replace", &json!({"text": "old", "with": "New", "at": first})).unwrap();
+    assert_eq!(s.execute("text.find", &q).unwrap().as_array().unwrap().len(), n - 1);
+
+    let r = s.execute("text.replace", &json!({"text": "old", "with": "new", "wholeWords": true})).unwrap();
+    assert_eq!(r["replaced"].as_u64(), Some(n as u64 - 2));
+    let text = s.doc().unwrap().doc.slides[0].shapes.iter().filter_map(|x| x.text.as_ref()).map(|t| t.text()).collect::<Vec<_>>().join("|");
+    assert!(text.contains("New plan, new team\nboldly"), "{text}");
+    assert!(s.execute("text.replace", &json!({"text": "zebra", "with": "x"})).is_err());
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.execute("text.find", &q).unwrap().as_array().unwrap().len(), n - 1);
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..24e5264d 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -49,6 +49,7 @@ fn title(id: &str) -> &'static str {
         "symbol" => "Symbol",
         "equation" => "Equation",
         "spelling" => "Spelling",
+        "find" => "Find and Replace",
         "accessibility" => "Accessibility Checker",
         "language" => "Language",
         "customShow" => "Custom Shows",
@@ -509,6 +510,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             }
             ok || cancel
         }
+        "find" => find_dialog(app, ui, d),
         "spelling" => {
             let v = app.session.execute("review.spelling", &json!({})).unwrap_or_default();
             let list = v.as_array().cloned().unwrap_or_default();
@@ -829,3 +831,82 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+/// Home › Find / Replace: step through matches (slide text, table cells, notes) or replace them.
+fn find_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    let replace_mode = d.get("replace", "0") == "1";
+    field(ui, d, "Find what:", "text", "");
+    if replace_mode {
+        field(ui, d, "Replace with:", "with", "");
+    }
+    let case = check(ui, d, "Match case", "matchCase", false);
+    let whole = check(ui, d, "Find whole words only", "wholeWords", false);
+    let text = d.get("text", "");
+    let q = json!({"text": text, "matchCase": case, "wholeWords": whole});
+    let mut close = false;
+    let mut find_next = false;
+    ui.add_space(6.0);
+    ui.horizontal(|ui| {
+        let has = !text.is_empty();
+        if ui.add_enabled(has, egui::Button::new("Find Next")).clicked() || (has && ui.input(|i| i.key_pressed(egui::Key::Enter))) {
+            find_next = true;
+        }
+        if replace_mode {
+            if ui.add_enabled(has, egui::Button::new("Replace")).clicked() {
+                let cur: Option<Value> = serde_json::from_str(&d.get("cur", "")).ok();
+                if let Some(at) = cur {
+                    let mut p = q.clone();
+                    p["with"] = json!(d.get("with", ""));
+                    p["at"] = at;
+                    if app.session.execute("text.replace", &p).is_ok() {
+                        let n = d.get("next", "1").parse::<usize>().unwrap_or(1);
+                        d.fields.insert("next".into(), n.saturating_sub(1).to_string());
+                    }
+                }
+                find_next = true;
+            }
+            if ui.add_enabled(has, egui::Button::new("Replace All")).clicked() {
+                let mut p = q.clone();
+                p["with"] = json!(d.get("with", ""));
+                let msg = match app.session.execute("text.replace", &p) {
+                    Ok(v) => format!("Replaced {} occurrence(s).", v.get("replaced").and_then(Value::as_u64).unwrap_or(0)),
+                    Err(_) => format!("DeckCraft can't find “{text}”."),
+                };
+                d.fields.insert("status".into(), msg);
+                d.fields.remove("cur");
+            }
+        } else if ui.button("Replace…").clicked() {
+            d.fields.insert("replace".into(), "1".into());
+        }
+        if ui.button("Close").clicked() {
+            close = true;
+        }
+    });
+    if find_next {
+        let list = app.session.execute("text.find", &q).ok().and_then(|v| v.as_array().cloned()).unwrap_or_default();
+        if list.is_empty() {
+            d.fields.insert("status".into(), format!("DeckCraft can't find “{text}”."));
+            d.fields.remove("cur");
+        } else {
+            let n = d.get("next", "0").parse::<usize>().unwrap_or(0) % list.len();
+            let m = &list[n];
+            let _ = app.run("slide.go", json!({"index": m.get("slide").cloned().unwrap_or_default()}));
+            if let Some(id) = m.get("shape").filter(|v| !v.is_null()) {
+                let _ = app.run("edit.select", json!({"ids": [id]}));
+            }
+            d.fields.insert("cur".into(), m.to_string());
+            d.fields.insert("next".into(), (n + 1).to_string());
+            let where_ = if m.get("shape").is_some_and(Value::is_null) { " (notes)" } else { "" };
+            d.fields.insert(
+                "status".into(),
+                format!("Match {} of {} on slide {}{where_}.", n + 1, list.len(), m.get("slide").and_then(Value::as_u64).unwrap_or(0) + 1),
+            );
+        }
+    }
+    let status = d.get("status", "");
+    if !status.is_empty() {
+        ui.add_space(4.0);
+        ui.label(status);
+    }
+    close
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..9ac7f431 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -168,6 +168,8 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.saveAsDialog", "Save As…", None, "{}"),
     ("app.exportDialog", "Export…", None, "{}"),
     ("app.dialog", "Open Dialog", None, "{id}"),
+    ("app.find", "Find…", Some("Cmd+F"), "{}"),
+    ("app.replace", "Replace…", Some("Cmd+H"), "{}"),
     ("app.links", "Community Links", None, "{}"),
 ];
 
@@ -541,6 +543,12 @@ impl SlideApp {
             "app.insertVideoDialog" => self.pick_and_insert("video", "insert.video"),
             "app.saveAsDialog" => self.save_as_dialog("deckcraft"),
             "app.exportDialog" => self.dialog = Some(dialogs::Dialog::new("export")),
+            "app.find" | "app.replace" if self.session.active().is_some() => {
+                let mut d = dialogs::Dialog::new("find");
+                d.fields.insert("replace".into(), if id == "app.replace" { "1" } else { "0" }.into());
+                self.dialog = Some(d);
+            }
+            "app.find" | "app.replace" => self.palette = Some((String::new(), 0)),
             "app.dialog" => {
                 let d = p.get("id").and_then(Value::as_str).ok_or("missing `id`")?;
                 self.dialog = Some(dialogs::Dialog::new(d));
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..ce1e2b39 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -61,10 +61,8 @@ pub fn ui_shortcut(app: &mut SlideApp, key: egui::Key, m: Mods) -> bool {
             app.dialog = Some(crate::dialogs::Dialog::new("hyperlink"));
             return true;
         }
-        (F, true, false, false) => {
-            app.palette = Some((String::new(), 0));
-            return true;
-        }
+        (F, true, false, false) => "app.find",
+        (H, true, false, false) => "app.replace",
         _ => return false,
     };
     let _ = app.run(id, json!({}));
@@ -176,7 +174,8 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Duplicate", "edit.duplicate"),
                 ("Delete Slide", "slide.delete"),
                 ("-", ""),
-                ("Find…", "app.palette"),
+                ("Find…", "app.find"),
+                ("Replace…", "app.replace"),
             ],
         ),
         (
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..a1e57fca 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -998,6 +998,12 @@ fn home(app: &mut SlideApp, ui: &mut Ui) {
         big(app, ui, Icon::Picture, "Picture", "app.insertPictureDialog", json!({}));
     });
     drawing_group(app, ui);
+    group(ui, |ui| {
+        ui.vertical(|ui| {
+            small(app, ui, Icon::Search, "Find", "app.find", json!({}));
+            small(app, ui, Icon::Spelling, "Replace", "app.replace", json!({}));
+        });
+    });
     group(ui, |ui| {
         big(app, ui, Icon::DesignIdeas, "Design\nIdeas", "view.pane", json!({"pane": "designer"}));
     });
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..8d3d2dba 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Find and Replace, Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -137,7 +137,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 |---|---|
 | Native macOS menu bar from `menu_tree()`, filled out to PowerPoint's menu items | 3–5 |
 | Format Shape pane depth | 6–10 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
+| Missing dialogs (Font, Bullets and Numbering, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
 | Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
 | Grid Options, edit points UI, crop depth | 4–7 |
 | Multiple windows | 3–5 |

From d500d045b54fe585a39dc8b5ceb4ce61e2f4ec3d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:45:04 +0300
Subject: [PATCH 186/376] Insert: Action Settings dialog and shape.action
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Shapes could only get an action from an action button preset or a
hyperlink to a URL or slide. Insert > Action > Action Settings… opens
PowerPoint's dialog with Mouse Click and Mouse Over tabs: None,
Hyperlink to (next, previous, first, last, last viewed, end show, a
custom show, a slide or a URL), Run program, Play media, and Highlight
click, starting from the shape's current setting.

The new shape.action command sets or clears the click or hover action
of the selected shapes and checks slides, custom shows and required
arguments.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/insert.rs |  58 +++++++++++++++
 crates/engine/src/tests.rs      |  24 +++++++
 crates/ui-egui/src/dialogs.rs   | 122 ++++++++++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs    |   5 ++
 4 files changed, 209 insertions(+)

diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..ca6bdb06 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -49,6 +49,15 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("insert.slideNumber", "Slide Number", ["Insert", "Text"], None, "{}", has_slide, slide_number),
         cmd!("insert.dateTime", "Date & Time", ["Insert", "Text"], None, "{format?: datetime1..}", has_slide, date_time),
         cmd!("insert.symbol", "Symbol", ["Insert", "Symbols"], None, "{text: character(s)}", has_slide, symbol),
+        cmd!(
+            "shape.action",
+            "Action Settings",
+            ["Insert", "Links"],
+            None,
+            "{on?: click|hover, action: none|next|previous|first|last|lastViewed|endShow|playMedia|slide|url|customShow|program, slide?: index, url?, show?: custom show name, path?, highlight?: bool, tooltip?, ids?}",
+            has_selection,
+            shape_action
+        ),
         cmd!(
             "insert.hyperlink",
             "Link",
@@ -599,6 +608,55 @@ fn hyperlink(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
+/// Insert ▸ Action (Action Settings): what clicking the selected shapes, or pointing at them, does
+/// in a show.
+fn shape_action(s: &mut Session, p: &Value) -> Result<Value> {
+    use deckcraft_model::text::{Action, Hyperlink};
+    const CMD: &str = "shape.action";
+    let hover = match str_param(p, "on").unwrap_or("click") {
+        "click" => false,
+        "hover" | "over" => true,
+        o => return Err(bad(CMD, format!("`on` is click or hover, not `{o}`"))),
+    };
+    let need = |k: &str| str_param(p, k).map(str::to_string).filter(|v| !v.trim().is_empty()).ok_or_else(|| bad(CMD, format!("missing `{k}`")));
+    let action = match str_param(p, "action").unwrap_or("none") {
+        "none" => None,
+        "next" => Some(Action::NextSlide),
+        "previous" => Some(Action::PreviousSlide),
+        "first" => Some(Action::FirstSlide),
+        "last" => Some(Action::LastSlide),
+        "lastViewed" => Some(Action::LastViewed),
+        "endShow" => Some(Action::EndShow),
+        "playMedia" => Some(Action::PlayMedia),
+        "url" => Some(Action::Url { url: need("url")? }),
+        "customShow" => {
+            let name = need("show")?;
+            if !s.doc()?.doc.custom_shows.iter().any(|c| c.name == name) {
+                return Err(bad(CMD, format!("no custom show `{name}`")));
+            }
+            Some(Action::CustomShow { name })
+        }
+        "program" => Some(Action::Program { path: need("path")? }),
+        "slide" => {
+            let i = usize_param(p, "slide").ok_or_else(|| bad(CMD, "missing `slide`"))?;
+            let slide = s.doc()?.doc.slides.get(i).ok_or_else(|| bad(CMD, "no such slide"))?;
+            Some(Action::Slide { slide: slide.id })
+        }
+        a => return Err(bad(CMD, format!("unknown action `{a}`"))),
+    };
+    let highlight = bool_param(p, "highlight").unwrap_or(true);
+    let tooltip = str_param(p, "tooltip").unwrap_or("").to_string();
+    let link = action.map(|action| Hyperlink { action, tooltip, highlight_click: highlight });
+    edit_shapes(s, p, CMD, |sh| {
+        if hover {
+            sh.hover = link.clone();
+        } else {
+            sh.click = link.clone();
+        }
+        Ok(())
+    })
+}
+
 fn action_button(s: &mut Session, p: &Value) -> Result<Value> {
     use deckcraft_model::text::{Action, Hyperlink};
     let kind = str_param(p, "kind").unwrap_or("custom");
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..ecd47563 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,27 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// Action Settings: click and hover actions on the selected shape, removed again with `none`.
+#[test]
+fn action_settings_set_click_and_hover() {
+    use deckcraft_model::text::Action;
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({})).unwrap();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [0, 0, 50, 50]})).unwrap();
+    let shape = |s: &Session| s.doc().unwrap().selected_shapes()[0].clone();
+    s.execute("shape.action", &json!({"action": "slide", "slide": 0, "highlight": false})).unwrap();
+    let first = s.doc().unwrap().doc.slides[0].id;
+    let sh = shape(&s);
+    assert!(matches!(sh.click.as_ref().map(|h| (&h.action, h.highlight_click)), Some((Action::Slide { slide }, false)) if *slide == first));
+    s.execute("shape.action", &json!({"on": "hover", "action": "url", "url": "https://example.com"})).unwrap();
+    assert!(matches!(shape(&s).hover.map(|h| h.action), Some(Action::Url { url }) if url == "https://example.com"));
+    assert!(shape(&s).click.is_some(), "hover leaves the click action");
+    s.execute("shape.action", &json!({"action": "none"})).unwrap();
+    assert!(shape(&s).click.is_none());
+    // Bad input is refused.
+    assert!(s.execute("shape.action", &json!({"action": "slide", "slide": 99})).is_err());
+    assert!(s.execute("shape.action", &json!({"action": "url"})).is_err());
+    assert!(s.execute("shape.action", &json!({"action": "customShow", "show": "nope"})).is_err());
+    assert!(s.execute("shape.action", &json!({"on": "drag", "action": "next"})).is_err());
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..de4208f5 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -55,6 +55,7 @@ fn title(id: &str) -> &'static str {
         "chartData" => "Chart Data",
         "trim" => "Trim Media",
         "smartart" => "Choose a SmartArt Graphic",
+        "action" => "Action Settings",
         "quit" => "DeckCraft",
         _ => "DeckCraft",
     }
@@ -344,6 +345,127 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             }
             ok || cancel
         }
+        "action" => {
+            use deckcraft_model::text::Action;
+            let tab = d.get("tab", "click");
+            // Start from the selected shape's current setting for this tab.
+            let (cur, slides, shows) = app
+                .session
+                .active()
+                .map(|st| {
+                    let sh = st.selected_shapes().first().map(|x| if tab == "hover" { x.hover.clone() } else { x.click.clone() }).unwrap_or(None);
+                    let slides: Vec<(deckcraft_model::SlideId, String)> =
+                        st.doc.slides.iter().enumerate().map(|(i, sl)| (sl.id, format!("{}. {}", i + 1, sl.title()))).collect();
+                    let shows: Vec<String> = st.doc.custom_shows.iter().map(|c| c.name.clone()).collect();
+                    (sh, slides, shows)
+                })
+                .unwrap_or_default();
+            let (cur_kind, cur_arg) = match cur.as_ref().map(|h| &h.action) {
+                None => ("none", String::new()),
+                Some(Action::NextSlide) => ("next", String::new()),
+                Some(Action::PreviousSlide) => ("previous", String::new()),
+                Some(Action::FirstSlide) => ("first", String::new()),
+                Some(Action::LastSlide) => ("last", String::new()),
+                Some(Action::LastViewed) => ("lastViewed", String::new()),
+                Some(Action::EndShow) => ("endShow", String::new()),
+                Some(Action::PlayMedia) => ("playMedia", String::new()),
+                Some(Action::Url { url }) => ("url", url.clone()),
+                Some(Action::CustomShow { name }) => ("customShow", name.clone()),
+                Some(Action::Program { path }) => ("program", path.clone()),
+                Some(Action::Slide { slide }) => ("slide", slides.iter().position(|(id, _)| id == slide).unwrap_or(0).to_string()),
+            };
+            ui.horizontal(|ui| {
+                for (k, l) in [("click", "Mouse Click"), ("hover", "Mouse Over")] {
+                    if ui.selectable_label(tab == k, l).clicked() && tab != k {
+                        d.fields.clear();
+                        d.fields.insert("tab".into(), k.into());
+                    }
+                }
+            });
+            ui.separator();
+            ui.label(if tab == "hover" { "Action on mouse over" } else { "Action on click" });
+            let kind = d.get("kind", cur_kind);
+            let hyperlink = !matches!(kind.as_str(), "none" | "program" | "playMedia");
+            let pick = |d: &mut Dialog, ui: &mut Ui, k: &str, l: &str| {
+                if ui.radio(d.get("kind", cur_kind) == k, l).clicked() {
+                    d.fields.insert("kind".into(), k.into());
+                }
+            };
+            pick(d, ui, "none", "None");
+            ui.horizontal(|ui| {
+                if ui.radio(hyperlink, "Hyperlink to:").clicked() && !hyperlink {
+                    d.fields.insert("kind".into(), "next".into());
+                }
+                let targets = [
+                    ("next", "Next Slide"),
+                    ("previous", "Previous Slide"),
+                    ("first", "First Slide"),
+                    ("last", "Last Slide"),
+                    ("lastViewed", "Last Slide Viewed"),
+                    ("endShow", "End Show"),
+                    ("customShow", "Custom Show…"),
+                    ("slide", "Slide…"),
+                    ("url", "URL…"),
+                ];
+                let shown = targets.iter().find(|t| t.0 == kind).map_or("Next Slide", |t| t.1);
+                ui.add_enabled_ui(hyperlink, |ui| {
+                    egui::ComboBox::from_id_salt("action-target").selected_text(shown).show_ui(ui, |ui| {
+                        for (k, l) in targets {
+                            if ui.selectable_label(kind == k, l).clicked() {
+                                d.fields.insert("kind".into(), k.into());
+                            }
+                        }
+                    });
+                });
+            });
+            let kind = d.get("kind", cur_kind);
+            match kind.as_str() {
+                "url" => field(ui, d, "Address:", "arg", if cur_kind == "url" { &cur_arg } else { "https://" }),
+                "slide" => {
+                    let sel = d.get("arg", if cur_kind == "slide" { &cur_arg } else { "0" }).parse::<usize>().unwrap_or(0);
+                    egui::ScrollArea::vertical().max_height(140.0).show(ui, |ui| {
+                        for (i, (_, t)) in slides.iter().enumerate() {
+                            if ui.selectable_label(sel == i, t).clicked() {
+                                d.fields.insert("arg".into(), i.to_string());
+                            }
+                        }
+                    });
+                }
+                "customShow" => {
+                    if shows.is_empty() {
+                        ui.label("This presentation has no custom shows (Slide Show ▸ Custom Slide Show).");
+                    }
+                    let sel = d.get("arg", if cur_kind == "customShow" { &cur_arg } else { shows.first().map_or("", String::as_str) });
+                    for n in &shows {
+                        if ui.selectable_label(&sel == n, n).clicked() {
+                            d.fields.insert("arg".into(), n.clone());
+                        }
+                    }
+                }
+                _ => {}
+            }
+            pick(d, ui, "program", "Run program:");
+            if d.get("kind", cur_kind) == "program" {
+                field(ui, d, "Program:", "arg", if cur_kind == "program" { &cur_arg } else { "" });
+            }
+            pick(d, ui, "playMedia", "Play the shape's media");
+            let hl = check(ui, d, "Highlight click", "highlight", cur.as_ref().is_none_or(|h| h.highlight_click));
+            let (ok, cancel) = buttons(ui, "OK");
+            if ok {
+                let kind = d.get("kind", cur_kind);
+                let arg = d.get("arg", &cur_arg);
+                let mut p = json!({"on": tab, "action": kind, "highlight": hl});
+                match kind.as_str() {
+                    "url" => p["url"] = json!(arg),
+                    "slide" => p["slide"] = json!(arg.parse::<usize>().unwrap_or(0)),
+                    "customShow" => p["show"] = json!(arg),
+                    "program" => p["path"] = json!(arg),
+                    _ => {}
+                }
+                run(app, "shape.action", p);
+            }
+            ok || cancel
+        }
         "altText" => {
             let cur = app.session.active().and_then(|s| s.selected_shapes().first().map(|x| x.descr.clone())).unwrap_or_default();
             ui.label("How would you describe this object and its context to someone who is blind or has low vision?");
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..538da3d9 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1062,6 +1062,11 @@ fn insert(app: &mut SlideApp, ui: &mut Ui) {
                     run(app, "insert.actionButton", json!({"kind": k}));
                 }
             }
+            ui.separator();
+            let has_sel = app.session.active().is_some_and(|s| !s.selection.shapes.is_empty());
+            if ui.add_enabled(has_sel, egui::Button::new("Action Settings…")).clicked() {
+                app.dialog = Some(crate::dialogs::Dialog::new("action"));
+            }
         });
     });
     group(ui, |ui| {

From 4dbea3256f8ae6d38e8e90fc51604e6677135358 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:52:40 +0300
Subject: [PATCH 187/376] =?UTF-8?q?UI:=20View=20=E2=80=BA=20New=20Window?=
 =?UTF-8?q?=20opens=20a=20second=20window?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The editor had one window, so looking at another slide meant leaving
the one you were editing. View › New Window opens one more window on
the same presentation. That window keeps its own slide and shows edits
from the first window. Closing it leaves the presentation open.
Arrange All is not included.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                       |   4 +-
 crates/ui-egui/src/doc_window.rs | 191 +++++++++++++++++++++++++++++++
 crates/ui-egui/src/lib.rs        |  44 +++++++
 crates/ui-egui/src/menus.rs      |   2 +
 crates/ui-egui/src/ribbon.rs     |   8 ++
 docs/parity-checklist.md         |   6 +-
 docs/roadmap.md                  |   2 +-
 docs/target-app-parity.md        |   2 +-
 docs/ui-parity.md                |   7 +-
 9 files changed, 257 insertions(+), 9 deletions(-)
 create mode 100644 crates/ui-egui/src/doc_window.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..2a028ab5 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (View › New Window; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | View › New Window opens a second window on the same presentation. The window has its own slide and shows edits made in the first window. Arrange All is not included |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: View › New Window |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/doc_window.rs b/crates/ui-egui/src/doc_window.rs
new file mode 100644
index 00000000..4445550d
--- /dev/null
+++ b/crates/ui-egui/src/doc_window.rs
@@ -0,0 +1,191 @@
+//! View › New Window: one more window on the same presentation.
+//!
+//! The window shows that document live, on its own slide, and does not move the editor's
+//! selection. It does not edit, and Arrange All is not here. Closing the window leaves the
+//! presentation open.
+
+use deckcraft_render::RenderOpts;
+use egui::{Color32, CornerRadius, Rect, RichText, pos2, vec2};
+use serde_json::{Value, json};
+
+use crate::SlideApp;
+
+/// The extra window. `uid` is the presentation it was opened on.
+pub struct DocWindow {
+    pub uid: u64,
+    pub slide: usize,
+    key: Option<(u64, u64, usize, u32, u32, bool)>,
+    tex: Option<egui::TextureHandle>,
+}
+
+/// `view.newWindow`. `{on: false}` closes it. `{slide}` or `{delta}` moves only this window.
+pub fn command(app: &mut SlideApp, p: &Value) -> Result<Value, String> {
+    if p.get("on").and_then(Value::as_bool) == Some(false) {
+        app.doc_window = None;
+        return Ok(json!({"open": false}));
+    }
+    let (uid, n, title, editor_slide) = {
+        let active = app.session.active().ok_or("New Window needs an open presentation")?;
+        let n = active.doc.slides.len();
+        if n == 0 {
+            return Err("New Window needs a slide".into());
+        }
+        (active.uid, n, window_title(&active.title()), active.selection.slide.min(n - 1))
+    };
+    let mut slide = app.doc_window.as_ref().filter(|w| w.uid == uid).map(|w| w.slide).unwrap_or(editor_slide);
+    if let Some(i) = p.get("slide").and_then(Value::as_u64) {
+        slide = i as usize;
+    }
+    if let Some(delta) = p.get("delta").and_then(Value::as_i64) {
+        slide = shift(slide, delta, n);
+    }
+    if slide >= n {
+        slide = n - 1;
+    }
+    match app.doc_window.as_mut().filter(|w| w.uid == uid) {
+        Some(w) => w.slide = slide,
+        None => {
+            app.doc_window = Some(DocWindow { uid, slide, key: None, tex: None });
+        }
+    }
+    Ok(json!({"open": true, "window": 2, "slide": slide, "slides": n, "title": title}))
+}
+
+pub fn window_title(name: &str) -> String {
+    format!("{name}:2")
+}
+
+fn shift(slide: usize, delta: i64, n: usize) -> usize {
+    if n == 0 {
+        return 0;
+    }
+    let last = (n as i64) - 1;
+    (slide as i64).saturating_add(delta).clamp(0, last) as usize
+}
+
+/// Draw the extra window, or drop it when its presentation has been closed.
+pub fn show(app: &mut SlideApp, ctx: &egui::Context) {
+    let Some(uid) = app.doc_window.as_ref().map(|w| w.uid) else { return };
+    let found =
+        app.session.documents().iter().find(|d| d.uid == uid).map(|d| (d.doc.slides.len(), window_title(&d.title()), d.revision, d.doc.clone()));
+    let Some((n, title, revision, doc)) = found else {
+        app.doc_window = None;
+        return;
+    };
+    if n == 0 {
+        app.doc_window = None;
+        return;
+    }
+    let slide = app.doc_window.as_ref().map(|w| w.slide.min(n - 1)).unwrap_or(0);
+    if let Some(w) = app.doc_window.as_mut() {
+        w.slide = slide;
+    }
+    let grayscale = app.ui.grayscale;
+    ctx.show_viewport_immediate(
+        egui::ViewportId::from_hash_of("deckcraft_doc_window"),
+        egui::ViewportBuilder::default().with_title(title.clone()).with_inner_size([960.0, 640.0]).with_min_inner_size([480.0, 360.0]),
+        |ui, _| {
+            let t = crate::theme::Tokens::get(ui);
+            egui::CentralPanel::default().frame(egui::Frame::NONE.fill(t.canvas)).show(ui, |ui| {
+                egui::Panel::top("doc_window_bar")
+                    .exact_size(40.0)
+                    .frame(egui::Frame::NONE.fill(t.chrome).inner_margin(egui::Margin::symmetric(12, 8)))
+                    .show(ui, |ui| {
+                        ui.horizontal_centered(|ui| {
+                            ui.label(RichText::new(title.clone()).font(crate::theme::bold(13.0)).color(t.text));
+                            ui.add_space(16.0);
+                            ui.label(RichText::new(format!("Slide {} of {n}", slide + 1)).color(t.text_dim).font(crate::theme::font(13.0)));
+                            ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+                                if ui.add_enabled(slide + 1 < n, egui::Button::new("Next")).clicked() {
+                                    let _ = app.run("view.newWindow", json!({"delta": 1}));
+                                }
+                                if ui.add_enabled(slide > 0, egui::Button::new("Previous")).clicked() {
+                                    let _ = app.run("view.newWindow", json!({"delta": -1}));
+                                }
+                            });
+                        });
+                    });
+                egui::CentralPanel::default().frame(egui::Frame::NONE.fill(t.canvas).inner_margin(egui::Margin::same(16))).show(ui, |ui| {
+                    let avail = ui.available_rect_before_wrap();
+                    let (w, h) = pixel_size(&doc, avail.width());
+                    let tex = ensure_texture(app, ui.ctx(), &doc, uid, revision, slide, w, h, grayscale);
+                    if let Some(tex) = tex {
+                        let fitted = fit_rect(avail, w, h);
+                        ui.painter().rect_filled(fitted, CornerRadius::ZERO, Color32::WHITE);
+                        ui.painter().image(tex.id(), fitted, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
+                    }
+                });
+            });
+            if ui.input(|i| i.viewport().close_requested()) {
+                app.doc_window = None;
+            }
+        },
+    );
+}
+
+fn pixel_size(doc: &deckcraft_model::Presentation, width_pts: f32) -> (u32, u32) {
+    let w = (width_pts.round() as u32).clamp(64, 1400);
+    let aspect = doc.slide_size.height / doc.slide_size.width.max(1.0);
+    let h = ((w as f64) * aspect).round().clamp(1.0, 1400.0) as u32;
+    (w, h)
+}
+
+fn fit_rect(avail: Rect, w: u32, h: u32) -> Rect {
+    let aspect = h as f32 / (w as f32).max(1.0);
+    let mut width = avail.width();
+    let mut height = width * aspect;
+    if height > avail.height() {
+        height = avail.height();
+        width = height / aspect.max(0.01);
+    }
+    Rect::from_center_size(avail.center(), vec2(width.max(1.0), height.max(1.0)))
+}
+
+fn ensure_texture(
+    app: &mut SlideApp,
+    ctx: &egui::Context,
+    doc: &deckcraft_model::Presentation,
+    uid: u64,
+    revision: u64,
+    slide: usize,
+    w: u32,
+    h: u32,
+    grayscale: bool,
+) -> Option<egui::TextureHandle> {
+    let key = (uid, revision, slide, w, h, grayscale);
+    if let Some(win) = app.doc_window.as_ref()
+        && win.key == Some(key)
+        && let Some(tex) = win.tex.clone()
+    {
+        return Some(tex);
+    }
+    let img = deckcraft_render::render_slide(
+        doc,
+        slide,
+        &RenderOpts { scale: w as f64 / doc.slide_size.width.max(1.0), size: Some((w, h)), edit: true, threads: 0, ..Default::default() },
+    );
+    let tex = ctx.load_texture("doc-window-slide", crate::textures::to_color_image(&img, grayscale), egui::TextureOptions::LINEAR);
+    if let Some(win) = app.doc_window.as_mut() {
+        win.key = Some(key);
+        win.tex = Some(tex.clone());
+    }
+    Some(tex)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn the_window_title_marks_the_second_window() {
+        assert_eq!(window_title("Quarterly review"), "Quarterly review:2");
+    }
+
+    #[test]
+    fn shifting_stops_at_the_ends() {
+        assert_eq!(shift(0, -1, 3), 0);
+        assert_eq!(shift(1, 1, 3), 2);
+        assert_eq!(shift(2, 5, 3), 2);
+        assert_eq!(shift(0, 1, 0), 0);
+    }
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..a08312b1 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -11,6 +11,7 @@ pub mod canvas;
 pub mod control;
 pub mod credits;
 pub mod dialogs;
+pub mod doc_window;
 pub mod fillui;
 pub mod icons;
 pub mod media;
@@ -151,6 +152,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("view.collapseRibbon", "Collapse the Ribbon", Some("Cmd+F1"), "{}"),
     ("view.dark", "Dark Mode", None, "{on?: bool}"),
     ("view.grayscale", "Grayscale", None, "{on?: bool}"),
+    ("view.newWindow", "New Window", None, "{on?: bool, slide?: index, delta?: int}"),
     ("show.start", "Slide Show", Some("F5"), "{from?: index}"),
     ("show.presenter", "Presenter View", None, "{on?: bool}"),
     ("show.end", "End Show", None, "{}"),
@@ -227,6 +229,8 @@ pub struct SlideApp {
     pub(crate) thumb_drag: Option<(usize, usize)>,
     /// Selection pane: folded groups, renaming, drag and drop.
     pub selpane: selpane::State,
+    /// View › New Window: a second window on one presentation. `None` when it is closed.
+    pub doc_window: Option<doc_window::DocWindow>,
 }
 
 impl SlideApp {
@@ -267,6 +271,7 @@ impl SlideApp {
             ui_fonts: uifonts::UiFonts::default(),
             thumb_drag: None,
             selpane: selpane::State::default(),
+            doc_window: None,
         }
     }
 
@@ -493,6 +498,7 @@ impl SlideApp {
                 self.restyle = true;
             }
             "view.grayscale" => self.ui.grayscale = self.flag(p, self.ui.grayscale),
+            "view.newWindow" => return doc_window::command(self, p),
             "show.start" => {
                 let from = p.get("from").and_then(Value::as_u64).map(|v| v as usize).unwrap_or(0);
                 self.start_show(from, false);
@@ -937,6 +943,7 @@ impl SlideApp {
         self.tick_media(&ctx);
         if self.show.is_some() {
             show::ui(self, ui);
+            doc_window::show(self, &ctx);
             self.perf.frame_ms = now_ms() - t0;
             return;
         }
@@ -986,6 +993,7 @@ impl SlideApp {
             ctx.open_url(egui::OpenUrl::new_tab(url));
         }
         self.drain_requests();
+        doc_window::show(self, &ctx);
         self.perf.frame_ms = now_ms() - t0;
     }
 
@@ -1305,6 +1313,42 @@ mod tests {
         app.run("app.home", json!({})).unwrap();
         assert!(!app.backstage_open(), "with nothing open the start screen shows anyway");
     }
+
+    /// View › New Window is a second window on the open presentation. Its slide is its own;
+    /// the editor's selection stays where it was. Closing the window leaves the document open.
+    #[test]
+    fn new_window_shows_the_same_document_on_its_own_slide() {
+        let mut app = SlideApp::new(Session::with_new(), Services::default());
+        app.session.execute("slide.new", &json!({})).unwrap();
+        app.session.execute("slide.go", &json!({"index": 1})).unwrap();
+        let err = {
+            let mut empty = SlideApp::new(Session::new(), Services::default());
+            empty.run("view.newWindow", json!({})).unwrap_err()
+        };
+        assert!(err.contains("presentation"), "{err}");
+
+        let name = app.session.active().unwrap().title();
+        let opened = app.run("view.newWindow", json!({})).unwrap();
+        assert_eq!(opened["open"], true);
+        assert_eq!(opened["window"], 2);
+        assert_eq!(opened["slide"], 1);
+        assert_eq!(opened["title"], format!("{name}:2"));
+        assert_eq!(app.session.active().unwrap().selection.slide, 1);
+
+        let moved = app.run("view.newWindow", json!({"delta": -1})).unwrap();
+        assert_eq!(moved["slide"], 0);
+        assert_eq!(app.doc_window.as_ref().unwrap().slide, 0);
+        assert_eq!(app.session.active().unwrap().selection.slide, 1, "the editor stays on its slide");
+
+        let again = app.run("view.newWindow", json!({})).unwrap();
+        assert_eq!(again["window"], 2);
+        assert_eq!(again["slide"], 0, "opening again keeps the window's slide");
+
+        app.session.execute("file.close", &json!({})).unwrap();
+        doc_window::show(&mut app, &egui::Context::default());
+        assert!(app.doc_window.is_none(), "closing the presentation closes the extra window");
+        assert!(app.session.active().is_none());
+    }
     fn canvas_harness() -> egui_kittest::Harness<'static, SlideApp> {
         let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
             |ui, app: &mut SlideApp| {
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..8402aa28 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -198,6 +198,8 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Zoom In", "view.zoomIn"),
                 ("Zoom Out", "view.zoomOut"),
                 ("Fit to Window", "view.fit"),
+                ("-", ""),
+                ("New Window", "view.newWindow"),
             ],
         ),
         (
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..f24cd071 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1860,6 +1860,14 @@ fn view(app: &mut SlideApp, ui: &mut Ui) {
             app.ui.zoom = None;
         }
     });
+    group(ui, |ui| {
+        let has = app.session.active().is_some();
+        let on = app.doc_window.is_some();
+        let resp = big_button_ex(ui, Icon::NewWindow, "New\nWindow", has, false, on).0;
+        if resp.on_hover_text("Open another window on this presentation").clicked() {
+            let _ = app.run("view.newWindow", json!({}));
+        }
+    });
     group(ui, |ui| {
         let gs = app.ui.grayscale;
         if big_button_ex(ui, Icon::Grayscale, "Grayscale", true, false, gs).0.clicked() {
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..68b6a8b8 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -9,14 +9,14 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 13 | 16 | 25 | 39% |
 
 | Area | Parity |
 |---|---|
 | Application shell | 77% |
 | Files | 71% |
 | Slides | 90% |
-| Views | 90% |
+| Views | 93% |
 | Masters & themes | 85% |
 | Shapes | 88% |
 | Format | 83% |
@@ -89,7 +89,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Views | Rulers, gridlines, guides | P1 | P |
 | Views | Smart guides | P1 | D |
 | Views | Grayscale / black and white view | P2 | D |
-| Views | New window / arrange windows | P2 | M |
+| Views | New window / arrange windows | P2 | P |
 | Masters & themes | Slide Master view (edit master and layouts) | P0 | D |
 | Masters & themes | Insert/rename/delete layouts, insert placeholders | P1 | D |
 | Masters & themes | Handout and Notes masters | P2 | M |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..692661ce 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -80,7 +80,7 @@ From the local execution plan (`plan/execution-plan.md`, gitignored). Status as
 | M7 | Slide show | mostly | second-display placement, laser, record |
 | M8 | Tables and charts | partly | chart data grid, elements, chartex types, draw table |
 | M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), text warps |
-| M10 | Views | done | grid options, New Window |
+| M10 | Views | done | grid options, Arrange All |
 | M11 | Output | partly | vector PDF, SVG, GIF, MP4, print |
 | M12 | Review | partly | dictionaries, AutoCorrect, find/replace dialog, compare |
 | M13 | Automation and CLI parity | done | |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..9b33fa9d 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -182,7 +182,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Application shell | 5 | 71% | ~55% | 8–14 | No native macOS menu bar, thin start screen (templates, recent), one window per presentation missing | [ui-parity.md](ui-parity.md) |
 | Files (commands) | 4 | 69% | ~50% | see file formats | Print, reuse slides, passwords, legacy and macro formats | [file-format-parity.md](file-format-parity.md) |
 | Slides and sections | 6 | 90% | ~85% | 3–5 | Zoom (summary/section/slide), copying slides between decks keeps formatting only partly | [parity-checklist.md](parity-checklist.md) |
-| Views | 4 | 90% | ~80% | 3–6 | Snap to grid and grid options, New Window | [ui-parity.md](ui-parity.md) |
+| Views | 4 | 90% | ~80% | 3–6 | Snap to grid and grid options, Arrange All | [ui-parity.md](ui-parity.md) |
 | Masters and themes | 7 | 85% | ~70% | 8–14 | Notes and Handout masters, theme variants, `.thmx`, effect schemes | [parity-checklist.md](parity-checklist.md) |
 | Shapes | 7 | 86% | ~75% | 8–14 | Edit points, text warp, WordArt depth | [ui-parity.md](ui-parity.md) |
 | Format (fill, line, effects) | 6 | 81% | ~65% | 8–14 | Format Shape pane depth, bevel and 3-D, picture/texture fill options | [ui-parity.md](ui-parity.md) |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..7dd402db 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (View › New Window opens a second window on the same presentation; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -23,7 +23,7 @@ AGENTS.md §2). Dimension score: **~60% ready** (estimated), **30–50 h** to pa
 | Status bar: slide counter, language, notes, comments, views, zoom slider | yes | yes | |
 | Command search (Tell Me) | yes | command palette | #79 default entry fails |
 | Light / dark appearance | follows the system | light or dark; doesn't follow the system (#41) | 1–2 h |
-| One window per presentation, New Window, Arrange All | yes | tabs in one window; no New Window | 3–5 h |
+| One window per presentation, New Window, Arrange All | yes | New Window opens one more window on the same presentation (its own slide, live with edits); tabs stay in the first window; no Arrange All | Arrange All |
 | Quick Access Toolbar customization | yes | no | P1 partial |
 
 ## File tab (Backstage)
@@ -140,7 +140,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 | Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
 | Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
 | Grid Options, edit points UI, crop depth | 4–7 |
-| Multiple windows | 3–5 |
+| Arrange All (New Window is one extra window) | 2–3 |
 | A screenshot comparison pass on the most-used tabs | 2–4 |
 | **Total** | **~30–52** |
 
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | View › New Window: a second window on the same presentation, with its own slide; Arrange All is still missing |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From f0be1aa767f9e89ab8ae16b6237490ac1641ee20 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:55:45 +0300
Subject: [PATCH 188/376] Edit: Paste Special (destination theme, keep source,
 picture, text only)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Adds edit.pasteSpecial. Keep Source Formatting bakes the copied shapes'
theme colours and theme fonts into fixed values (captured at copy time),
Picture draws the copied shapes into one PNG picture, and Keep Text Only
pastes plain text. Ctrl+Alt+V, Edit › Paste Special… and the Paste menu
open a Paste Special dialog.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/arrange.rs |   2 +-
 crates/engine/src/cmd/edit.rs    | 119 ++++++++++++++++++++++++++++++-
 crates/engine/src/lib.rs         |   3 +
 crates/engine/src/tests.rs       |  52 ++++++++++++++
 crates/ui-egui/src/dialogs.rs    |  22 ++++++
 crates/ui-egui/src/lib.rs        |   2 +
 crates/ui-egui/src/menus.rs      |   5 ++
 crates/ui-egui/src/ribbon.rs     |   3 +
 docs/parity-checklist.md         |   8 +--
 9 files changed, 210 insertions(+), 6 deletions(-)

diff --git a/crates/engine/src/cmd/arrange.rs b/crates/engine/src/cmd/arrange.rs
index 0c91bbaa..480c6d63 100644
--- a/crates/engine/src/cmd/arrange.rs
+++ b/crates/engine/src/cmd/arrange.rs
@@ -153,7 +153,7 @@ fn reorder(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 /// Bounds of shapes (rotation included).
-fn union_bounds(xs: &[Xfrm]) -> Option<Rect> {
+pub(crate) fn union_bounds(xs: &[Xfrm]) -> Option<Rect> {
     let mut it = xs.iter().map(Xfrm::bounds);
     let first = it.next()?;
     Some(it.fold(first, |a, b| a.union(b)))
diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 30437b15..0ca7c864 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -15,6 +15,15 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("edit.cut", "Cut", ["Home", "Clipboard"], Some("Cmd+X"), "{scope?: slides}", has_doc, cut),
         cmd!(noundo "edit.copy", "Copy", ["Home", "Clipboard"], Some("Cmd+C"), "{scope?: slides} → {text}", has_doc, copy),
         cmd!("edit.paste", "Paste", ["Home", "Clipboard"], Some("Cmd+V"), "{text?: plain text to paste, scope?: slides}", has_doc, paste),
+        cmd!(
+            "edit.pasteSpecial",
+            "Paste Special",
+            ["Home", "Clipboard"],
+            None,
+            "{as: destinationTheme|keepSource|picture|text} — Use Destination Theme, Keep Source Formatting, Picture (PNG), Keep Text Only",
+            has_doc,
+            paste_special
+        ),
         cmd!("edit.pasteText", "Paste and Match Formatting", ["Edit"], Some("Cmd+Shift+V"), "{text?}", has_doc, paste_text),
         cmd!("edit.duplicate", "Duplicate", ["Edit"], Some("Cmd+D"), "{ids?}", has_selection, duplicate),
         cmd!("edit.delete", "Delete", ["Edit"], Some("Delete"), "{ids?, scope?: slides}", has_doc, delete),
@@ -110,7 +119,8 @@ fn copy_inner(s: &mut Session, p: &Value) -> Result<String> {
     media_of_shapes(&shapes, &mut mids);
     let media = st.doc.media.iter().filter(|m| mids.contains(&m.id)).cloned().collect();
     let plain = shapes.iter().filter_map(|x| x.text.as_ref().map(|t| t.text())).collect::<Vec<_>>().join("\n");
-    s.clipboard = crate::Clipboard { shapes, media, plain: plain.clone(), ..Default::default() };
+    let source_theme = st.current_slide().and_then(|sl| st.doc.master_for(sl)).map(|(m, _)| (m.scheme(), m.theme.fonts.clone()));
+    s.clipboard = crate::Clipboard { shapes, media, plain: plain.clone(), source_theme, ..Default::default() };
     Ok(plain)
 }
 
@@ -239,6 +249,113 @@ fn paste_plain(s: &mut Session, text: &str) -> Result<Value> {
     s.execute("insert.textBox", &json!({"rect": rect, "text": text}))
 }
 
+fn paste_special(s: &mut Session, p: &Value) -> Result<Value> {
+    match str_param(p, "as").unwrap_or("destinationTheme") {
+        "destinationTheme" | "useDestinationTheme" => paste(s, &json!({})),
+        "text" | "keepTextOnly" => paste_text(s, &json!({})),
+        "keepSource" | "keepSourceFormatting" => {
+            let saved = s.clipboard.clone();
+            if let Some((scheme, fonts)) = &saved.source_theme {
+                bake_theme(&mut s.clipboard.shapes, scheme, fonts);
+            }
+            let r = paste(s, &json!({}));
+            let pastes = s.clipboard.pastes;
+            s.clipboard = saved;
+            s.clipboard.pastes = pastes;
+            r
+        }
+        "picture" => paste_picture(s),
+        other => Err(bad("edit.pasteSpecial", format!("unknown `as`: {other} (destinationTheme, keepSource, picture, text)"))),
+    }
+}
+
+/// Replace theme colours and theme fonts with the values they have in `scheme` / `fonts`, so the
+/// shapes keep their look under another theme.
+pub(crate) fn bake_theme(shapes: &mut [Shape], scheme: &deckcraft_color::ColorScheme, fonts: &deckcraft_model::theme::FontScheme) {
+    fn rec(v: &mut Value, scheme: &deckcraft_color::ColorScheme, fonts: &deckcraft_model::theme::FontScheme, depth: usize) {
+        if depth > 256 {
+            return;
+        }
+        match v {
+            Value::Object(o) => {
+                if o.get("kind").and_then(Value::as_str) == Some("scheme")
+                    && let Some(slot) = o.get("slot").and_then(|x| serde_json::from_value::<deckcraft_color::SchemeSlot>(x.clone()).ok())
+                    && slot != deckcraft_color::SchemeSlot::PhClr
+                    && let Ok(rgb) = serde_json::to_value(scheme.get(slot))
+                {
+                    o.clear();
+                    o.insert("kind".into(), json!("rgb"));
+                    o.insert("rgb".into(), rgb);
+                    return;
+                }
+                for x in o.values_mut() {
+                    rec(x, scheme, fonts, depth + 1);
+                }
+            }
+            Value::Array(a) => a.iter_mut().for_each(|x| rec(x, scheme, fonts, depth + 1)),
+            Value::String(t) if t.starts_with('+') => {
+                let set = match t.get(1..3) {
+                    Some("mj") => &fonts.major,
+                    Some("mn") => &fonts.minor,
+                    _ => return,
+                };
+                let face = match t.get(3..) {
+                    Some("-lt") => &set.latin,
+                    Some("-ea") => &set.ea,
+                    Some("-cs") => &set.cs,
+                    _ => return,
+                };
+                if !face.is_empty() {
+                    *t = face.clone();
+                }
+            }
+            _ => {}
+        }
+    }
+    for sh in shapes.iter_mut() {
+        let Ok(mut v) = serde_json::to_value(&*sh) else { continue };
+        rec(&mut v, scheme, fonts, 0);
+        if let Ok(baked) = serde_json::from_value::<Shape>(v) {
+            *sh = baked;
+        }
+    }
+}
+
+/// Paste Special › Picture: the copied shapes drawn into one PNG picture.
+fn paste_picture(s: &mut Session) -> Result<Value> {
+    let mut clip = s.clipboard.clone();
+    if clip.shapes.is_empty() {
+        return Err(bad("edit.pasteSpecial", "copy shapes first to paste them as a picture"));
+    }
+    if let Some((scheme, fonts)) = &clip.source_theme {
+        bake_theme(&mut clip.shapes, scheme, fonts);
+    }
+    let st = s.doc()?;
+    let mut doc = (*st.doc).clone();
+    bring_media(&mut doc, &clip.media);
+    let mut slide = st.current_slide().cloned().ok_or_else(|| bad("edit.pasteSpecial", "no slide"))?;
+    let xs: Vec<deckcraft_geom::Xfrm> = clip.shapes.iter().filter_map(|x| x.xfrm).collect();
+    let b = super::arrange::union_bounds(&xs).ok_or_else(|| bad("edit.pasteSpecial", "nothing to draw"))?;
+    let gx = deckcraft_geom::Xfrm::new(b.x0, b.y0, b.width(), b.height());
+    let gid = ShapeId(u32::MAX - 1);
+    let one = if clip.shapes.len() == 1 {
+        let mut sh = clip.shapes[0].clone();
+        sh.id = gid;
+        sh
+    } else {
+        Shape { id: gid, xfrm: Some(gx), kind: deckcraft_model::ShapeKind::Group { children: clip.shapes.clone(), child: gx }, ..Default::default() }
+    };
+    slide.shapes = vec![one];
+    const SCALE: f64 = 2.0;
+    let img = deckcraft_render::render_shape(&doc, &slide, gid, SCALE).ok_or_else(|| bad("edit.pasteSpecial", "the shapes could not be drawn"))?;
+    // render_shape draws the bounds plus an 8 pt margin (room for shadows and outlines).
+    let (w, h) = (img.width as f64 / SCALE, img.height as f64 / SCALE);
+    let same_slide = clip.shapes.iter().any(|c| st.shape(c.id).is_some());
+    let off = if same_slide { s.prefs.duplicate_offset } else { 0.0 };
+    let png = img.to_png();
+    s.execute("insert.picture", &json!({"data": base64_encode(&png), "name": "Picture.png", "rect": [b.x0 - 8.0 + off, b.y0 - 8.0 + off, w, h]}))
+}
+
 fn paste_text(s: &mut Session, p: &Value) -> Result<Value> {
     let t = str_param(p, "text").map(String::from).unwrap_or_else(|| s.clipboard.plain.clone());
     paste_plain(s, &t)
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..eafe54f1 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -319,6 +319,9 @@ pub struct Clipboard {
     pub media: Vec<deckcraft_model::MediaItem>,
     pub text: Option<deckcraft_model::TextBody>,
     pub plain: String,
+    /// The copied shapes' theme colours (colour map applied) and fonts, for Paste Special ›
+    /// Keep Source Formatting.
+    pub source_theme: Option<(deckcraft_color::ColorScheme, deckcraft_model::theme::FontScheme)>,
     /// How many times the shapes were pasted (each paste offsets further).
     pub pastes: u32,
 }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..1563b874 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,55 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn paste_special_keeps_source_look_picture_or_text() {
+    use deckcraft_model::style::{ColorBase, Fill};
+    let mut s = session();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 200, 100], "text": "Q3 plan"})).unwrap();
+    s.execute("shape.fill", &json!({"color": "accent1"})).unwrap();
+    let old_accent = {
+        let d = s.doc().unwrap();
+        let sl = d.current_slide().unwrap();
+        d.doc.master_for(sl).unwrap().0.scheme().get(deckcraft_color::SchemeSlot::Accent1)
+    };
+    s.execute("edit.copy", &json!({})).unwrap();
+    s.execute("design.theme", &json!({"name": "Ember"})).unwrap();
+    {
+        let d = s.doc().unwrap();
+        let sl = d.current_slide().unwrap();
+        assert_ne!(d.doc.master_for(sl).unwrap().0.scheme().get(deckcraft_color::SchemeSlot::Accent1), old_accent);
+    }
+    let fill_of = |s: &Session, id: &Value| {
+        let sid = deckcraft_model::ShapeId(id.as_u64().unwrap() as u32);
+        s.doc().unwrap().shape(sid).unwrap().fill.clone()
+    };
+
+    let dest = s.execute("edit.pasteSpecial", &json!({"as": "destinationTheme"})).unwrap();
+    assert!(matches!(fill_of(&s, &dest["ids"][0]), Some(Fill::Solid { color }) if matches!(color.base, ColorBase::Scheme { .. })));
+
+    let keep = s.execute("edit.pasteSpecial", &json!({"as": "keepSource"})).unwrap();
+    match fill_of(&s, &keep["ids"][0]) {
+        Some(Fill::Solid { color }) => assert_eq!(color.base, ColorBase::Rgb { rgb: old_accent }),
+        f => panic!("{f:?}"),
+    }
+    // The clipboard itself still holds the theme-following shape.
+    assert!(matches!(&s.clipboard.shapes[0].fill, Some(Fill::Solid { color }) if matches!(color.base, ColorBase::Scheme { .. })));
+
+    let pic = s.execute("edit.pasteSpecial", &json!({"as": "picture"})).unwrap();
+    let pid = deckcraft_model::ShapeId(pic["id"].as_u64().or_else(|| pic["ids"][0].as_u64()).unwrap() as u32);
+    let d = s.doc().unwrap();
+    let sh = d.shape(pid).unwrap();
+    let deckcraft_model::ShapeKind::Picture { fill } = &sh.kind else { panic!("{:?}", sh.kind) };
+    assert_eq!(d.doc.media(fill.media).unwrap().content_type, "image/png");
+    let x = sh.xfrm.unwrap();
+    assert!((x.w - 216.0).abs() < 1.0 && (x.h - 116.0).abs() < 1.0, "{x:?}");
+
+    let n = s.doc().unwrap().current_slide().unwrap().shapes.len();
+    s.execute("edit.pasteSpecial", &json!({"as": "text"})).unwrap();
+    let d = s.doc().unwrap();
+    let last = d.current_slide().unwrap().shapes.last().unwrap();
+    assert_eq!(d.current_slide().unwrap().shapes.len(), n + 1);
+    assert_eq!(last.text.as_ref().unwrap().text(), "Q3 plan");
+    assert!(s.execute("edit.pasteSpecial", &json!({"as": "bogus"})).is_err());
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..822d32e3 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -49,6 +49,7 @@ fn title(id: &str) -> &'static str {
         "symbol" => "Symbol",
         "equation" => "Equation",
         "spelling" => "Spelling",
+        "pasteSpecial" => "Paste Special",
         "accessibility" => "Accessibility Checker",
         "language" => "Language",
         "customShow" => "Custom Shows",
@@ -509,6 +510,27 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             }
             ok || cancel
         }
+        "pasteSpecial" => {
+            const OPTS: [(&str, &str); 4] = [
+                ("destinationTheme", "Use Destination Theme"),
+                ("keepSource", "Keep Source Formatting"),
+                ("picture", "Picture (PNG)"),
+                ("text", "Keep Text Only"),
+            ];
+            let has_shapes = !app.session.clipboard.shapes.is_empty();
+            let mut cur = d.get("as", "destinationTheme");
+            ui.label("As:");
+            for (id, label) in OPTS {
+                let ok = has_shapes || matches!(id, "destinationTheme" | "text");
+                ui.add_enabled_ui(ok, |ui| ui.radio_value(&mut cur, id.to_string(), label));
+            }
+            d.fields.insert("as".into(), cur.clone());
+            let (ok, cancel) = buttons(ui, "OK");
+            if ok {
+                run(app, "edit.pasteSpecial", json!({"as": cur}));
+            }
+            ok || cancel
+        }
         "spelling" => {
             let v = app.session.execute("review.spelling", &json!({})).unwrap_or_default();
             let list = v.as_array().cloned().unwrap_or_default();
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..4f6e0fb8 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -168,6 +168,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.saveAsDialog", "Save As…", None, "{}"),
     ("app.exportDialog", "Export…", None, "{}"),
     ("app.dialog", "Open Dialog", None, "{id}"),
+    ("app.pasteSpecial", "Paste Special…", Some("Cmd+Alt+V"), "{}"),
     ("app.links", "Community Links", None, "{}"),
 ];
 
@@ -541,6 +542,7 @@ impl SlideApp {
             "app.insertVideoDialog" => self.pick_and_insert("video", "insert.video"),
             "app.saveAsDialog" => self.save_as_dialog("deckcraft"),
             "app.exportDialog" => self.dialog = Some(dialogs::Dialog::new("export")),
+            "app.pasteSpecial" => self.dialog = Some(dialogs::Dialog::new("pasteSpecial")),
             "app.dialog" => {
                 let d = p.get("id").and_then(Value::as_str).ok_or("missing `id`")?;
                 self.dialog = Some(dialogs::Dialog::new(d));
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..f6805862 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -49,6 +49,10 @@ pub fn ui_shortcut(app: &mut SlideApp, key: egui::Key, m: Mods) -> bool {
             return true;
         }
         (O, true, false, false) => "app.openDialog",
+        (V, true, false, true) if app.session.active().is_some() => {
+            app.dialog = Some(crate::dialogs::Dialog::new("pasteSpecial"));
+            return true;
+        }
         (P, true, true, false) => "app.palette",
         (Comma, true, false, false) => "app.preferences",
         (Equals | Plus, true, false, false) => "view.zoomIn",
@@ -171,6 +175,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Copy", "edit.copy"),
                 ("Paste", "edit.paste"),
                 ("Paste and Match Formatting", "edit.pasteText"),
+                ("Paste Special…", "app.pasteSpecial"),
                 ("-", ""),
                 ("Select All", "edit.selectAll"),
                 ("Duplicate", "edit.duplicate"),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..a8106666 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -292,6 +292,9 @@ fn clipboard_group(app: &mut SlideApp, ui: &mut Ui) {
                 if ui.button("Paste and Match Formatting").clicked() {
                     run(app, "edit.pasteText", json!({}));
                 }
+                if ui.button("Paste Special…").clicked() {
+                    run(app, "app.pasteSpecial", json!({}));
+                }
                 if ui.button("Paste Formatting").clicked() {
                     run(app, "format.painterApply", json!({}));
                 }
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..4fa924e8 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -3,12 +3,12 @@
 > **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 79%** over 191 features.
+**Weighted breadth parity: 80%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
+| P1 | 65 | 39 | 20 | 6 | 75% |
 | P2 | 54 | 13 | 15 | 26 | 38% |
 
 | Area | Parity |
@@ -32,7 +32,7 @@ The summary between `<!-- SUMMARY -->
 | Slide show | 66% |
 | Review | 60% |
 | Draw | 33% |
-| Undo & clipboard | 88% |
+| Undo & clipboard | 100% |
 | Automation (✱) | 100% |
 | Platforms (✱) | 67% |
 
@@ -227,7 +227,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Draw | Ink to shape / text | P2 | M |
 | Undo & clipboard | Unlimited undo/redo | P0 | D |
 | Undo & clipboard | Cut, copy, paste shapes and slides | P0 | D |
-| Undo & clipboard | Paste special (keep formatting, picture, text only) | P1 | P |
+| Undo & clipboard | Paste special (keep formatting, picture, text only) | P1 | D |
 | Automation (✱) | Every command scriptable (CLI, control channel, MCP) | P0 | D |
 | Automation (✱) | Headless rendering and conversion | P0 | D |
 | Platforms (✱) | macOS, Windows, Linux builds | P0 | P |

From b763579d94a1cfc6fba3a7a50c3ee8ae78ac5ffb Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Tue, 13 Oct 2026 23:55:59 +0300
Subject: [PATCH 189/376] View: movable drawing guides saved with the
 presentation

View > Guides used to paint two fixed centre lines. Guides now belong
to the presentation (DrawGuide, read from and written to p:guideLst in
viewProps.xml, in eighths of a point), so they survive a save and
reopen in PowerPoint.

- Turning Guides on gives a deck without guides PowerPoint's two
  centre guides.
- A guide can be dragged anywhere away from shapes. It moves in whole
  points, unless Alt is held or snapping is off, and shows its
  distance from the centre while it moves.
- A guide dropped off the slide is deleted.
- The slide context menu's Grid and Guides submenu has Add Vertical
  Guide and Add Horizontal Guide.
- While guides are shown, moving and resizing shapes snaps to them.

New commands guide.add, guide.move and guide.delete are undoable;
guide.list is a query.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/arrange.rs      | 85 +++++++++++++++++++++++++++
 crates/engine/src/cmd/guides_tests.rs | 76 ++++++++++++++++++++++++
 crates/engine/src/tools.rs            | 64 ++++++++++++++++++++
 crates/model/src/defaults.rs          |  1 +
 crates/model/src/lib.rs               | 12 ++++
 crates/pptx/src/read/mod.rs           | 14 +++++
 crates/pptx/src/write/mod.rs          | 25 +++++++-
 crates/ui-egui/src/canvas.rs          | 82 ++++++++++++++++++++++----
 crates/ui-egui/src/guides_tests.rs    | 69 ++++++++++++++++++++++
 crates/ui-egui/src/lib.rs             |  8 ++-
 10 files changed, 423 insertions(+), 13 deletions(-)
 create mode 100644 crates/engine/src/cmd/guides_tests.rs
 create mode 100644 crates/ui-egui/src/guides_tests.rs

diff --git a/crates/engine/src/cmd/arrange.rs b/crates/engine/src/cmd/arrange.rs
index 0c91bbaa..fb2c8c53 100644
--- a/crates/engine/src/cmd/arrange.rs
+++ b/crates/engine/src/cmd/arrange.rs
@@ -9,6 +9,18 @@ use crate::{Result, Session};
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![
+        cmd!(
+            "guide.add",
+            "Add Guide",
+            ["View", "Show", "Guides"],
+            None,
+            "{vertical: bool, pos?: pt (default: the slide's centre)} → {index}. `defaults: true` adds the two centre guides when there are none",
+            has_doc,
+            guide_add
+        ),
+        cmd!("guide.move", "Move Guide", [], None, "{index, pos: pt}", has_doc, guide_move),
+        cmd!("guide.delete", "Delete Guide", [], None, "{index}", has_doc, guide_delete),
+        cmd!(query "guide.list", "Guides", [], None, "{} → [{vertical, pos}]", has_doc, guide_list),
         cmd!("arrange.bringToFront", "Bring to Front", ["Arrange"], Some("Cmd+Shift+]"), "{ids?}", has_selection, |s, p| order(s, p, 2)),
         cmd!("arrange.bringForward", "Bring Forward", ["Arrange"], Some("Cmd+]"), "{ids?}", has_selection, |s, p| order(s, p, 1)),
         cmd!("arrange.sendBackward", "Send Backward", ["Arrange"], Some("Cmd+["), "{ids?}", has_selection, |s, p| order(s, p, -1)),
@@ -338,3 +350,76 @@ fn distribute(s: &mut Session, p: &Value) -> Result<Value> {
         Ok(())
     })
 }
+
+/// Guides are kept on the slide; a file can hold at most this many.
+const MAX_GUIDES: usize = 200;
+
+fn guide_limit(s: &Session, vertical: bool) -> Result<f64> {
+    let size = s.doc()?.doc.slide_size;
+    Ok(if vertical { size.width } else { size.height })
+}
+
+fn guide_add(s: &mut Session, p: &Value) -> Result<Value> {
+    if bool_or(p, "defaults", false) {
+        if !s.doc()?.doc.guides.is_empty() {
+            return Ok(json!({"added": 0}));
+        }
+        let size = s.doc()?.doc.slide_size;
+        return s.edit(|doc, _| {
+            doc.guides = vec![
+                deckcraft_model::DrawGuide { vertical: true, pos: size.width / 2.0 },
+                deckcraft_model::DrawGuide { vertical: false, pos: size.height / 2.0 },
+            ];
+            Ok(json!({"added": 2}))
+        });
+    }
+    let vertical = bool_or(p, "vertical", true);
+    let limit = guide_limit(s, vertical)?;
+    let pos = p.get("pos").and_then(Value::as_f64).filter(|v| v.is_finite()).unwrap_or(limit / 2.0).clamp(0.0, limit);
+    if s.doc()?.doc.guides.len() >= MAX_GUIDES {
+        return Err(bad("guide.add", "too many guides"));
+    }
+    s.edit(|doc, _| {
+        doc.guides.push(deckcraft_model::DrawGuide { vertical, pos });
+        Ok(json!({"index": doc.guides.len() - 1}))
+    })
+}
+
+fn guide_index(s: &Session, p: &Value, cmd: &str) -> Result<usize> {
+    let i = usize_param(p, "index").ok_or_else(|| bad(cmd, "missing `index`"))?;
+    if i >= s.doc()?.doc.guides.len() {
+        return Err(bad(cmd, "no such guide"));
+    }
+    Ok(i)
+}
+
+fn guide_move(s: &mut Session, p: &Value) -> Result<Value> {
+    let i = guide_index(s, p, "guide.move")?;
+    let vertical = s.doc()?.doc.guides.get(i).is_some_and(|g| g.vertical);
+    let limit = guide_limit(s, vertical)?;
+    let pos = p.get("pos").and_then(Value::as_f64).filter(|v| v.is_finite()).ok_or_else(|| bad("guide.move", "missing `pos`"))?.clamp(0.0, limit);
+    s.edit(|doc, _| {
+        if let Some(g) = doc.guides.get_mut(i) {
+            g.pos = pos;
+        }
+        Ok(json!({"index": i, "pos": pos}))
+    })
+}
+
+fn guide_delete(s: &mut Session, p: &Value) -> Result<Value> {
+    let i = guide_index(s, p, "guide.delete")?;
+    s.edit(|doc, _| {
+        if i < doc.guides.len() {
+            doc.guides.remove(i);
+        }
+        ok()
+    })
+}
+
+fn guide_list(s: &mut Session, _p: &Value) -> Result<Value> {
+    Ok(serde_json::to_value(&s.doc()?.doc.guides).unwrap_or_default())
+}
+
+#[cfg(test)]
+#[path = "guides_tests.rs"]
+mod guides_tests;
diff --git a/crates/engine/src/cmd/guides_tests.rs b/crates/engine/src/cmd/guides_tests.rs
new file mode 100644
index 00000000..3211b6bb
--- /dev/null
+++ b/crates/engine/src/cmd/guides_tests.rs
@@ -0,0 +1,76 @@
+//! Drawing guides: commands, dragging a guide with the pointer, snapping shapes to guides, and
+//! the PPTX round trip.
+
+use serde_json::json;
+
+use crate::Session;
+use crate::tools::{Mods, PointerEvent, PointerKind};
+
+fn ev(s: &mut Session, kind: PointerKind, x: f64, y: f64) {
+    s.pointer(PointerEvent { kind, x, y, mods: Mods::default(), tol: 4.0 }).unwrap();
+}
+
+#[test]
+fn add_move_delete_and_undo() {
+    let mut s = Session::with_new();
+    assert_eq!(s.execute("guide.add", &json!({"defaults": true})).unwrap()["added"], 2);
+    assert_eq!(s.execute("guide.add", &json!({"defaults": true})).unwrap()["added"], 0, "only when there are none");
+    let i = s.execute("guide.add", &json!({"vertical": false, "pos": 100})).unwrap()["index"].as_u64().unwrap();
+    assert_eq!(i, 2);
+    s.execute("guide.move", &json!({"index": 2, "pos": 5000})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.guides[2].pos, 540.0, "kept on the slide");
+    assert!(s.execute("guide.move", &json!({"index": 9, "pos": 1})).is_err());
+    assert!(s.execute("guide.move", &json!({"index": 0, "pos": null})).is_err());
+    s.execute("guide.delete", &json!({"index": 0})).unwrap();
+    assert_eq!(s.execute("guide.list", &json!({})).unwrap().as_array().unwrap().len(), 2);
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.guides.len(), 3);
+}
+
+#[test]
+fn drag_a_guide_drop_it_off_the_slide_and_snap_shapes_to_it() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("guide.add", &json!({"vertical": true, "pos": 300})).unwrap();
+    // Hidden guides can't be grabbed: the press starts a marquee instead.
+    ev(&mut s, PointerKind::Down, 300.0, 50.0);
+    ev(&mut s, PointerKind::Up, 300.0, 50.0);
+    assert_eq!(s.doc().unwrap().doc.guides[0].pos, 300.0);
+    s.tool.guides_visible = true;
+    ev(&mut s, PointerKind::Down, 301.0, 50.0);
+    ev(&mut s, PointerKind::Drag, 350.4, 60.0);
+    assert_eq!(s.tool.guide_drag, Some((0, 350.0)), "whole points while dragging");
+    ev(&mut s, PointerKind::Up, 350.4, 60.0);
+    assert_eq!(s.doc().unwrap().doc.guides[0].pos, 350.0);
+    assert_eq!(s.tool.guide_drag, None);
+
+    // A shape dragged near the guide snaps its left edge onto it.
+    let id = s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 200, 80, 60]})).unwrap()["id"].as_u64().unwrap();
+    s.prefs.snap_to_grid = false;
+    ev(&mut s, PointerKind::Down, 140.0, 230.0);
+    ev(&mut s, PointerKind::Drag, 200.0, 230.0);
+    ev(&mut s, PointerKind::Drag, 388.0, 231.0);
+    ev(&mut s, PointerKind::Up, 388.0, 231.0);
+    let x = s.doc().unwrap().shapes().iter().find(|sh| sh.id.0 as u64 == id).and_then(|sh| sh.xfrm).unwrap();
+    assert!((x.x - 350.0).abs() < 0.01, "{x:?}");
+
+    // Dropped off the slide: gone, and undo brings it back.
+    ev(&mut s, PointerKind::Down, 350.0, 10.0);
+    ev(&mut s, PointerKind::Drag, -40.0, 10.0);
+    ev(&mut s, PointerKind::Up, -40.0, 10.0);
+    assert!(s.doc().unwrap().doc.guides.is_empty());
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.guides.len(), 1);
+}
+
+#[test]
+fn guides_round_trip_through_pptx() {
+    let mut s = Session::with_new();
+    s.execute("guide.add", &json!({"vertical": true, "pos": 123.5})).unwrap();
+    s.execute("guide.add", &json!({"vertical": false, "pos": 400})).unwrap();
+    let bytes = deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap();
+    let back = deckcraft_pptx::import(&bytes).unwrap();
+    assert_eq!(back.guides, s.doc().unwrap().doc.guides);
+    let none = deckcraft_pptx::import(&deckcraft_pptx::export(&deckcraft_model::Presentation::default()).unwrap()).unwrap();
+    assert!(none.guides.is_empty());
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..282be6ea 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -123,6 +123,10 @@ enum Drag {
         start: Point,
         add: bool,
     },
+    /// Dragging drawing guide `index`.
+    Guide {
+        index: usize,
+    },
     Create {
         start: Point,
     },
@@ -178,6 +182,12 @@ pub struct ToolState {
     pub path_preview: Vec<Point>,
     pub path_smooth: bool,
     pub path_closing: bool,
+    /// Drawing guides are shown (View › Guides): they can be dragged and shapes snap to them.
+    pub guides_visible: bool,
+    /// The guide being dragged and where it is now (slide points); `None` once dropped.
+    pub guide_drag: Option<(usize, f64)>,
+    /// The drawing guide under the pointer, for the cursor.
+    pub guide_hover: Option<usize>,
 }
 
 impl ToolState {
@@ -286,6 +296,8 @@ impl Session {
                     return Ok(Value::Null);
                 }
                 self.tool.hover = self.hit_test(p, tol);
+                self.tool.guide_hover =
+                    if self.tool.hover.is_none() && matches!(self.tool.kind, ToolKind::Select) { self.guide_at(p, tol) } else { None };
                 let line_tool = matches!(&self.tool.kind, ToolKind::Shape { preset } if deckcraft_geom::preset::is_line_like(preset));
                 if line_tool {
                     self.update_sites(p, tol, None);
@@ -451,6 +463,14 @@ impl Session {
                     let _ = self.execute("animation.painterApply", &json!({"ids": [id]}));
                 }
             }
+            None if self.guide_at(p, tol).is_some() => {
+                // Away from every shape a press on a guide picks the guide up.
+                if let Some(index) = self.guide_at(p, tol) {
+                    let pos = st.doc.guides.get(index).map(|g| g.pos).unwrap_or(0.0);
+                    self.tool.drag = Some(Drag::Guide { index });
+                    self.tool.guide_drag = Some((index, pos));
+                }
+            }
             None => {
                 let add = mods.shift || mods.cmd;
                 self.select(|_, sel| {
@@ -470,6 +490,13 @@ impl Session {
     fn drag(&mut self, p: Point, mods: Mods, tol: f64) -> Result<Value> {
         let Some(drag) = self.tool.drag.clone() else { return Ok(Value::Null) };
         match drag {
+            Drag::Guide { index } => {
+                let vertical = self.active().and_then(|d| d.doc.guides.get(index)).is_some_and(|g| g.vertical);
+                let pos = if vertical { p.x } else { p.y };
+                // Guides move in whole points unless snapping is off, as in PowerPoint.
+                let pos = if self.prefs.snap_to_grid && !mods.alt { pos.round() } else { pos };
+                self.tool.guide_drag = Some((index, pos));
+            }
             Drag::Move { ids, start, origs, moved, duplicate, enter_text } => {
                 let mut d = p - start;
                 if !moved && (d.hypot() < tol.max(1.0) || origs.is_empty()) {
@@ -668,6 +695,18 @@ impl Session {
         self.tool.glue = None;
         let mut out = Value::Null;
         match drag {
+            Some(Drag::Guide { index }) => {
+                // Dropped off the slide: the guide is deleted.
+                let (_, pos) = self.tool.guide_drag.take().unwrap_or((index, 0.0));
+                let size = self.doc()?.doc.slide_size;
+                let vertical = self.doc()?.doc.guides.get(index).is_some_and(|g| g.vertical);
+                let limit = if vertical { size.width } else { size.height };
+                out = if pos < 0.0 || pos > limit {
+                    self.execute("guide.delete", &json!({"index": index}))?
+                } else {
+                    self.execute("guide.move", &json!({"index": index, "pos": pos}))?
+                };
+            }
             Some(Drag::Move { moved: false, enter_text: Some((id, at)), .. }) => {
                 // Plain click on text: caret at the click.
                 let st = self.doc()?;
@@ -942,6 +981,22 @@ impl Session {
         })
     }
 
+    /// The drawing guide within `tol` of `p` (only while guides are shown).
+    pub fn guide_at(&self, p: Point, tol: f64) -> Option<usize> {
+        if !self.tool.guides_visible {
+            return None;
+        }
+        let st = self.active()?;
+        st.doc
+            .guides
+            .iter()
+            .enumerate()
+            .map(|(i, g)| (i, if g.vertical { (p.x - g.pos).abs() } else { (p.y - g.pos).abs() }))
+            .filter(|(_, d)| *d <= tol.max(2.0))
+            .min_by(|a, b| a.1.total_cmp(&b.1))
+            .map(|(i, _)| i)
+    }
+
     /// Smart guides: snap `r` edges/centres to the slide and other shapes. Returns the offset to
     /// apply and the guides to draw.
     fn snap_rect(&self, r: Rect, exclude: &[ShapeId], tol: f64, enabled: bool) -> (Vec2, Vec<Guide>) {
@@ -960,6 +1015,15 @@ impl Session {
             (size.height / 2.0, Rect::new(0.0, size.height / 2.0, size.width, size.height / 2.0)),
             (size.height, Rect::new(0.0, size.height, size.width, size.height)),
         ];
+        if self.tool.guides_visible {
+            for g in &st.doc.guides {
+                if g.vertical {
+                    xs.push((g.pos, Rect::new(g.pos, 0.0, g.pos, size.height)));
+                } else {
+                    ys.push((g.pos, Rect::new(0.0, g.pos, size.width, g.pos)));
+                }
+            }
+        }
         for sh in st.shapes() {
             if exclude.contains(&sh.id) || sh.hidden {
                 continue;
diff --git a/crates/model/src/defaults.rs b/crates/model/src/defaults.rs
index 8432ce4a..3a7a4d3c 100644
--- a/crates/model/src/defaults.rs
+++ b/crates/model/src/defaults.rs
@@ -513,6 +513,7 @@ pub fn blank_presentation(size: Size, theme: Theme, title_slide: bool) -> Presen
         next_id: next.max(256),
         embedded_fonts: vec![],
         table_styles: vec![],
+        guides: vec![],
         raw_ext: None,
     };
     if title_slide {
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..b884cdf2 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -843,11 +843,23 @@ pub struct Presentation {
     /// Table styles defined in the file (`ppt/tableStyles.xml`).
     #[serde(skip_serializing_if = "Vec::is_empty")]
     pub table_styles: Vec<table::TableStyleDef>,
+    /// Drawing guides (View › Guides), shared by every slide (`p:guideLst` in viewProps).
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub guides: Vec<DrawGuide>,
     /// Unmodelled presentation-level XML kept for round-trip.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw_ext: Option<String>,
 }
 
+/// A drawing guide: a vertical line at `pos` points from the slide's left edge, or a horizontal
+/// one from its top.
+#[derive(Clone, Copy, Debug, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct DrawGuide {
+    pub vertical: bool,
+    pub pos: f64,
+}
+
 impl Default for Presentation {
     fn default() -> Self {
         defaults::new_presentation(None)
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..0b64fb86 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -357,6 +357,20 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
             p.custom_shows.push(CustomShow { name: cs.attr("name").unwrap_or("").to_string(), slides });
         }
     }
+    // Drawing guides (eighths of a point).
+    if let Some(r) = pres_part.rels.first_of("viewProps")
+        && let Some(d) = pkg.xml(&r.target)
+        && let Some(lst) = d.root.find("slideViewPr").and_then(|v| v.find("guideLst"))
+    {
+        p.guides = lst
+            .children_named("guide")
+            .filter_map(|g| {
+                let pos = g.attr("pos").and_then(|v| v.parse::<f64>().ok()).unwrap_or(0.0) / 8.0;
+                pos.is_finite().then_some(deckcraft_model::DrawGuide { vertical: g.attr("orient") != Some("horz"), pos })
+            })
+            .take(1000)
+            .collect();
+    }
     // Show settings.
     if let Some(r) = pres_part.rels.first_of("presProps")
         && let Some(d) = pkg.xml(&r.target)
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..03fad19b 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -511,7 +511,7 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
     pres.rels.add("viewProps", "viewProps.xml", false);
     pres.rels.add("tableStyles", "tableStyles.xml", false);
     x.pkg.xml_part("ppt/presProps.xml", CT_PRES_PROPS, pres_props_xml(p));
-    x.pkg.xml_part("ppt/viewProps.xml", CT_VIEW_PROPS, view_props_xml());
+    x.pkg.xml_part("ppt/viewProps.xml", CT_VIEW_PROPS, view_props_xml(p));
     let ts = crate::tables::table_styles_xml(&x.table_styles, &p.table_styles);
     x.pkg.xml_part("ppt/tableStyles.xml", CT_TABLE_STYLES, ts);
     let pxml = presentation_xml(&mut x, &mut pres, &master_rids, notes_master_rid.as_deref(), &slide_rids);
@@ -767,13 +767,34 @@ fn pres_props_xml(p: &Presentation) -> Vec<u8> {
     w.finish()
 }
 
-fn view_props_xml() -> Vec<u8> {
+fn view_props_xml(p: &Presentation) -> Vec<u8> {
     let mut w = W::new();
     root_open(&mut w, "p:viewPr", A::new());
     w.open0("p:normalViewPr");
     w.empty("p:restoredLeft", A::new().a("sz", 15620));
     w.empty("p:restoredTop", A::new().a("sz", 94660));
     w.close("p:normalViewPr");
+    if !p.guides.is_empty() {
+        // Drawing guides; `pos` is in eighths of a point (576 per inch).
+        w.open0("p:slideViewPr");
+        w.open0("p:cSldViewPr");
+        w.open0("p:cViewPr");
+        w.open0("p:scale");
+        w.empty("a:sx", A::new().a("n", 100).a("d", 100));
+        w.empty("a:sy", A::new().a("n", 100).a("d", 100));
+        w.close("p:scale");
+        w.empty("p:origin", A::new().a("x", 0).a("y", 0));
+        w.close("p:cViewPr");
+        w.open0("p:guideLst");
+        for g in p.guides.iter().take(1000) {
+            let pos = (g.pos * 8.0).round().clamp(-1.0e9, 1.0e9) as i64;
+            let a = if g.vertical { A::new().a("pos", pos) } else { A::new().a("orient", "horz").a("pos", pos) };
+            w.empty("p:guide", a);
+        }
+        w.close("p:guideLst");
+        w.close("p:cSldViewPr");
+        w.close("p:slideViewPr");
+    }
     w.empty("p:gridSpacing", A::new().a("cx", 76200).a("cy", 76200));
     w.close("p:viewPr");
     w.finish()
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..7f69d902 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -148,16 +148,9 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
             y += step;
         }
     }
+    app.session.tool.guides_visible = app.ui.guides;
     if app.ui.guides {
-        let c = slide_rect.center();
-        painter.line_segment(
-            [pos2(c.x, slide_rect.min.y), pos2(c.x, slide_rect.max.y)],
-            Stroke::new(1.0, Color32::from_rgba_unmultiplied(120, 120, 120, 160)),
-        );
-        painter.line_segment(
-            [pos2(slide_rect.min.x, c.y), pos2(slide_rect.max.x, c.y)],
-            Stroke::new(1.0, Color32::from_rgba_unmultiplied(120, 120, 120, 160)),
-        );
+        draw_guides(app, &painter, xf, slide_rect, &t);
     }
     if app.ui.ruler {
         ruler(&painter, avail, slide_rect, scale, &t);
@@ -366,6 +359,54 @@ fn ruler(p: &egui::Painter, avail: Rect, slide: Rect, scale: f32, t: &Tokens) {
     }
 }
 
+/// The presentation's drawing guides; the one being dragged at its new place, labelled with its
+/// distance from the slide's centre in points.
+fn draw_guides(app: &SlideApp, painter: &egui::Painter, xf: Xf, slide: Rect, t: &Tokens) {
+    let Some(st) = app.session.active() else { return };
+    let size = st.doc.slide_size;
+    let drag = app.session.tool.guide_drag;
+    for (i, g) in st.doc.guides.iter().enumerate() {
+        let (pos, active) = match drag {
+            Some((di, p)) if di == i => (p, true),
+            _ => (g.pos, app.session.tool.guide_hover == Some(i)),
+        };
+        let col = if active { t.accent } else { Color32::from_rgba_unmultiplied(120, 120, 120, 170) };
+        let stroke = Stroke::new(1.0, col);
+        let (a, b) = if g.vertical {
+            let x = xf.to_screen(Point::new(pos, 0.0)).x;
+            (pos2(x, slide.min.y), pos2(x, slide.max.y))
+        } else {
+            let y = xf.to_screen(Point::new(0.0, pos)).y;
+            (pos2(slide.min.x, y), pos2(slide.max.x, y))
+        };
+        // Dashed, like PowerPoint's guides.
+        let len = (b - a).length();
+        let dir = (b - a) / len.max(1.0);
+        let mut d = 0.0;
+        while d < len {
+            painter.line_segment([a + dir * d, a + dir * (d + 4.0).min(len)], stroke);
+            d += 7.0;
+        }
+        if drag.is_some_and(|(di, _)| di == i) {
+            let centre = if g.vertical { size.width / 2.0 } else { size.height / 2.0 };
+            let off = pos - centre;
+            let side = match (g.vertical, off < 0.0, off > 0.0) {
+                (true, true, _) => " left of centre",
+                (true, _, true) => " right of centre",
+                (false, true, _) => " above centre",
+                (false, _, true) => " below centre",
+                _ => " (centre)",
+            };
+            let label = format!("{:.0} pt{side}", off.abs());
+            let at = if g.vertical { pos2(a.x + 6.0, slide.min.y + 6.0) } else { pos2(slide.min.x + 6.0, a.y + 4.0) };
+            let galley = painter.layout_no_wrap(label, theme::font(11.0), t.text);
+            let r = Rect::from_min_size(at, galley.size()).expand(3.0);
+            painter.rect_filled(r, CornerRadius::same(3), t.card);
+            painter.galley(at, galley, t.text);
+        }
+    }
+}
+
 fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
     let tol = (4.0 / xf.scale) as f64;
     let m = mods(ui);
@@ -413,7 +454,11 @@ fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
             }
         }
         (_, Some(Hit::Shape { .. })) => egui::CursorIcon::Move,
-        _ => egui::CursorIcon::Default,
+        _ => match app.session.tool.guide_drag.map(|g| g.0).or(app.session.tool.guide_hover) {
+            Some(i) if app.session.active().and_then(|d| d.doc.guides.get(i)).is_some_and(|g| g.vertical) => egui::CursorIcon::ResizeHorizontal,
+            Some(_) => egui::CursorIcon::ResizeVertical,
+            None => egui::CursorIcon::Default,
+        },
     };
     if resp.hovered() {
         ui.ctx().set_cursor_icon(cursor);
@@ -682,6 +727,19 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
                     }
                 }
             });
+            ui.menu_button("Grid and Guides", |ui| {
+                let mut on = app.ui.guides;
+                if ui.checkbox(&mut on, "Guides").clicked() {
+                    let _ = app.run("view.guides", json!({"on": on}));
+                }
+                for (label, vertical) in [("Add Vertical Guide", true), ("Add Horizontal Guide", false)] {
+                    if ui.button(label).clicked() {
+                        let _ = app.run("guide.add", json!({"vertical": vertical}));
+                        let _ = app.run("view.guides", json!({"on": true}));
+                        ui.close();
+                    }
+                }
+            });
             if ui.button("Reset Slide").clicked() {
                 let _ = app.run("slide.reset", json!({}));
                 ui.close();
@@ -697,3 +755,7 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
         }
     });
 }
+
+#[cfg(test)]
+#[path = "guides_tests.rs"]
+mod guides_tests;
diff --git a/crates/ui-egui/src/guides_tests.rs b/crates/ui-egui/src/guides_tests.rs
new file mode 100644
index 00000000..4180e503
--- /dev/null
+++ b/crates/ui-egui/src/guides_tests.rs
@@ -0,0 +1,69 @@
+//! Drawing guides driven with the mouse: View › Guides adds the centre guides, dragging one
+//! moves it (with its distance from the centre shown), dropping it off the slide deletes it.
+
+use deckcraft_engine::Session;
+use egui::{Modifiers, PointerButton};
+use egui_kittest::Harness;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+#[test]
+fn turn_guides_on_drag_one_and_drop_it_off_the_slide() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let app = SlideApp::new(s, Services::default());
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.state_mut().run("view.guides", json!({"on": true})).unwrap();
+    h.run_steps(2);
+    let guides = |h: &Harness<'_, SlideApp>| h.state().session.active().unwrap().doc.guides.clone();
+    assert_eq!(guides(&h).len(), 2, "the two centre guides");
+    let (slide, k) = (h.state().slide_rect.unwrap(), h.state().canvas_scale);
+    let at = |x: f32, y: f32| slide.min + egui::vec2(x * k, y * k);
+
+    // Grab the vertical guide away from the horizontal one and drag it left.
+    let start = at(480.0, 100.0);
+    h.hover_at(start);
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: start, button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    h.run_steps(1);
+    for i in 1..=10 {
+        h.event(egui::Event::PointerMoved(at(480.0 - 18.0 * i as f32, 100.0)));
+        h.run_steps(1);
+    }
+    assert_eq!(h.state().session.tool.guide_drag, Some((0, 300.0)));
+    if let Ok(img) = h.render() {
+        let _ = img.save("/tmp/guides.png");
+    }
+    h.event(egui::Event::PointerButton { pos: at(300.0, 100.0), button: PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(2);
+    assert_eq!(guides(&h)[0].pos, 300.0);
+
+    // Off the top of the slide with the horizontal guide: deleted.
+    let g = at(700.0, 270.0);
+    h.hover_at(g);
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: g, button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    h.run_steps(1);
+    for i in 1..=10 {
+        h.event(egui::Event::PointerMoved(at(700.0, 270.0 - 30.0 * i as f32)));
+        h.run_steps(1);
+    }
+    h.event(egui::Event::PointerButton { pos: at(700.0, -30.0), button: PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(2);
+    assert_eq!(guides(&h).len(), 1);
+    assert!(guides(&h)[0].vertical);
+
+    // Hidden guides stay in the file but aren't drawn or grabbed.
+    h.state_mut().run("view.guides", json!({"on": false})).unwrap();
+    h.run_steps(2);
+    assert!(!h.state().session.tool.guides_visible);
+    assert_eq!(guides(&h).len(), 1);
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..cb0e7b31 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -457,7 +457,13 @@ impl SlideApp {
             "view.notes" => self.ui.notes = self.flag(p, self.ui.notes),
             "view.ruler" => self.ui.ruler = self.flag(p, self.ui.ruler),
             "view.gridlines" => self.ui.gridlines = self.flag(p, self.ui.gridlines),
-            "view.guides" => self.ui.guides = self.flag(p, self.ui.guides),
+            "view.guides" => {
+                self.ui.guides = self.flag(p, self.ui.guides);
+                // A presentation without guides gets PowerPoint's two centre guides.
+                if self.ui.guides && self.session.active().is_some_and(|d| d.doc.guides.is_empty()) {
+                    let _ = self.session.execute("guide.add", &json!({"defaults": true}));
+                }
+            }
             "view.zoomIn" | "view.zoomOut" => {
                 let cur = self.ui.zoom.unwrap_or(self.canvas_scale);
                 let steps = [0.1, 0.25, 0.33, 0.5, 0.66, 0.75, 1.0, 1.25, 1.5, 2.0, 3.0, 4.0];

From 184b76e2a72416b73c4e35313def163ddba90456 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:04:22 +0300
Subject: [PATCH 190/376] Round-trip text effects, layout, fills, bevels and
 connectors

An owned corpus of those kinds survives open, save and reopen. A run's
inner shadow, reflection and soft edge were dropped, and a bevel preset
with no kept 3-D XML was not written back, so import and export now keep
them.
---
 ROADMAP.md                        |   9 +-
 crates/model/src/text.rs          |   8 +
 crates/pptx/src/read/dml.rs       |   3 +
 crates/pptx/src/read/theme.rs     |   3 +
 crates/pptx/src/write/dml.rs      |  28 +++-
 crates/pptx/src/write/shapes.rs   |   2 +
 crates/pptx/src/write/theme.rs    |   2 +
 crates/pptx/tests/corpus_style.rs | 250 ++++++++++++++++++++++++++++++
 docs/file-format-parity.md        |  11 +-
 docs/gaps.md                      |  14 +-
 docs/roadmap.md                   |  12 +-
 11 files changed, 322 insertions(+), 20 deletions(-)
 create mode 100644 crates/pptx/tests/corpus_style.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..7d8ab840 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus for text effects, body layout, theme effects, fills, bevels and connectors; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -111,8 +111,9 @@ Ranked; detail and the full beta plan in [docs/roadmap.md](docs/roadmap.md).
 
 1. **No data loss, no startup crashes:** Close's save prompt (#60), Windows GPU crashes (#40, #59),
    image paste (#53), editor soak tests. 10–20 h.
-2. **PPTX on real decks:** owned corpus, round-trip checks, fixes; #70, #74, #77; EMF/WMF and SVG.
-   36–64 h.
+2. **PPTX on real decks:** owned corpus now covers text effects, autofit, columns, vertical and
+   RTL text, tabs, line spacing, theme effects, fills, bevels and connectors. Still open: a larger
+   corpus, embedded fonts, #70, #74, #77, EMF/WMF and SVG. 36–64 h.
 3. **Localization:** catalog, system language (#15), zh-Hans, es, fr, de, ja with IME. 27–46 h.
 4. **Output:** vector PDF, printing. 10–16 h.
 5. **Depth that users hit:** font weights (#69), chart data and elements, Animation Pane timeline,
@@ -128,6 +129,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | PPTX round trip of text effects, autofit, columns, vertical and RTL text, tab stops, line spacing, theme effects, gradient and pattern fills, 3-D bevels and connectors. A run keeps its inner shadow, reflection and soft edge, and a bevel preset with no kept 3-D XML is written back. Embedded fonts and #70, #74, #77 stay open |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +152,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: PPTX corpus for text effects, body layout, theme effects, fills, bevels and connectors |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/model/src/text.rs b/crates/model/src/text.rs
index 6a1a7527..473215b5 100644
--- a/crates/model/src/text.rs
+++ b/crates/model/src/text.rs
@@ -347,7 +347,12 @@ pub struct RunProps {
     pub link: Option<Hyperlink>,
     pub lang: Option<String>,
     pub shadow: Option<crate::style::Shadow>,
+    /// `a:innerShdw` on the run. Outer shadow stays in `shadow`.
+    pub inner_shadow: Option<crate::style::Shadow>,
     pub glow: Option<crate::style::Glow>,
+    pub reflection: Option<crate::style::Reflection>,
+    /// Soft-edge radius in points (`a:softEdge`).
+    pub soft_edge: Option<f64>,
     /// Spelling/grammar errors are not flagged.
     pub no_proof: Option<bool>,
 }
@@ -378,7 +383,10 @@ impl RunProps {
             link,
             lang,
             shadow,
+            inner_shadow,
             glow,
+            reflection,
+            soft_edge,
             no_proof
         );
     }
diff --git a/crates/pptx/src/read/dml.rs b/crates/pptx/src/read/dml.rs
index 0aee935c..209d05e0 100644
--- a/crates/pptx/src/read/dml.rs
+++ b/crates/pptx/src/read/dml.rs
@@ -503,7 +503,10 @@ pub fn rpr(imp: &mut Imp, part: &Part, r: &El) -> RunProps {
             "effectLst" => {
                 let fx = effects(e);
                 p.shadow = fx.outer_shadow;
+                p.inner_shadow = fx.inner_shadow;
                 p.glow = fx.glow;
+                p.reflection = fx.reflection;
+                p.soft_edge = fx.soft_edge;
             }
             "highlight" => p.highlight = color(e),
             "uFill" => p.underline_color = e.child("solidFill").and_then(color),
diff --git a/crates/pptx/src/read/theme.rs b/crates/pptx/src/read/theme.rs
index 7d6e614c..a94c6b0b 100644
--- a/crates/pptx/src/read/theme.rs
+++ b/crates/pptx/src/read/theme.rs
@@ -60,6 +60,9 @@ pub fn read_theme(imp: &mut Imp, part: &Part, root: &El) -> Theme {
                 .take(16)
                 .map(|e| {
                     let mut fx = e.child("effectLst").map(dml::effects).unwrap_or_default();
+                    if let Some(b) = e.path(&["sp3d", "bevelT"]) {
+                        fx.bevel = Some(b.attr("prst").unwrap_or("circle").to_string());
+                    }
                     let raw: String = e.elements().filter(|c| c.is("scene3d") || c.is("sp3d")).map(|c| part.keep(c)).collect();
                     if !raw.is_empty() {
                         fx.raw3d = Some(raw);
diff --git a/crates/pptx/src/write/dml.rs b/crates/pptx/src/write/dml.rs
index 16a069fe..0e83768a 100644
--- a/crates/pptx/src/write/dml.rs
+++ b/crates/pptx/src/write/dml.rs
@@ -339,6 +339,15 @@ pub fn effects(w: &mut W, fx: &Effects) {
     w.close("a:effectLst");
 }
 
+/// `a:sp3d` for a bevel preset when the shape or theme style has no kept 3-D XML.
+/// The preset name is limited to ASCII letters and digits so it cannot break the markup.
+pub fn bevel_sp3d(preset: &str) -> Option<String> {
+    if preset.is_empty() || preset.len() > 32 || !preset.chars().all(|c| c.is_ascii_alphanumeric()) {
+        return None;
+    }
+    Some(format!("<a:sp3d><a:bevelT prst=\"{preset}\"/></a:sp3d>"))
+}
+
 pub fn xfrm(w: &mut W, tag: &str, x: &Xfrm, child: Option<&Xfrm>) {
     let x = if x.is_finite() { *x } else { Xfrm::default() };
     let rot = ang(x.rot);
@@ -579,10 +588,10 @@ pub fn rpr(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, r: &RunProps) {
         .o("spc", r.spacing.map(|s| (s.clamp(-4000.0, 4000.0) * 100.0).round() as i64))
         .o("baseline", r.baseline.map(|b| pct(b.clamp(-10.0, 10.0))))
         .b("noProof", r.no_proof);
+    let has_fx = r.shadow.is_some() || r.inner_shadow.is_some() || r.glow.is_some() || r.reflection.is_some() || r.soft_edge.is_some();
     let has_kids = r.outline.is_some()
         || r.fill.is_some()
-        || r.shadow.is_some()
-        || r.glow.is_some()
+        || has_fx
         || r.highlight.is_some()
         || r.underline_color.is_some()
         || r.font.is_some()
@@ -604,8 +613,19 @@ pub fn rpr(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, r: &RunProps) {
             f => fill(w, x, o, f),
         }
     }
-    if r.shadow.is_some() || r.glow.is_some() {
-        effects(w, &Effects { outer_shadow: r.shadow.clone(), glow: r.glow.clone(), ..Default::default() });
+    if has_fx {
+        // Same child order as a shape's effect list: glow, inner shadow, outer shadow, reflection, soft edge.
+        effects(
+            w,
+            &Effects {
+                outer_shadow: r.shadow.clone(),
+                inner_shadow: r.inner_shadow.clone(),
+                glow: r.glow.clone(),
+                reflection: r.reflection.clone(),
+                soft_edge: r.soft_edge,
+                ..Default::default()
+            },
+        );
     }
     if let Some(h) = &r.highlight {
         w.open0("a:highlight");
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..794836bc 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -242,6 +242,8 @@ fn sp_pr(w: &mut W, x: &mut Exp, o: &mut Out, s: &Shape, geom: bool) {
         dml::effects(w, fx);
         if let Some(raw) = &fx.raw3d {
             w.raw(raw);
+        } else if let Some(xml) = fx.bevel.as_deref().and_then(dml::bevel_sp3d) {
+            w.raw(&xml);
         }
     }
     w.close("p:spPr");
diff --git a/crates/pptx/src/write/theme.rs b/crates/pptx/src/write/theme.rs
index d83e90f9..48039420 100644
--- a/crates/pptx/src/write/theme.rs
+++ b/crates/pptx/src/write/theme.rs
@@ -83,6 +83,8 @@ pub fn theme_xml(x: &mut Exp, o: &mut Out, t: &Theme) -> Vec<u8> {
         dml::effects(&mut w, e);
         if let Some(raw) = &e.raw3d {
             w.raw(raw);
+        } else if let Some(xml) = e.bevel.as_deref().and_then(dml::bevel_sp3d) {
+            w.raw(&xml);
         }
         w.close("a:effectStyle");
     }
diff --git a/crates/pptx/tests/corpus_style.rs b/crates/pptx/tests/corpus_style.rs
new file mode 100644
index 00000000..9f02c641
--- /dev/null
+++ b/crates/pptx/tests/corpus_style.rs
@@ -0,0 +1,250 @@
+//! Owned corpus: text effects, body layout, theme effects, fills, bevels and connectors.
+//! Open → save → reopen, twice, and compare the model.
+
+use std::sync::Arc;
+
+use deckcraft_color::{ColorTransform, Rgba, SchemeSlot};
+use deckcraft_geom::Xfrm;
+use deckcraft_model::style::{ColorRef, Dash, Effects, Fill, Glow, Gradient, GradientShape, GradientStop, Line, PatternFill, Reflection, Shadow};
+use deckcraft_model::text::{Align, AutoFit, BodyProps, ParaProps, Paragraph, Run, RunProps, Spacing, TabStop, TextBody, TextDir};
+use deckcraft_model::{Geom, Presentation, Shape, ShapeId, ShapeKind, defaults};
+
+fn shape(p: &mut Presentation, name: &str, x: f64, y: f64, w: f64, h: f64) -> Shape {
+    Shape { id: ShapeId(p.alloc_id()), name: name.into(), xfrm: Some(Xfrm::new(x, y, w, h)), ..Default::default() }
+}
+
+fn shadow(inner: bool, dir: f64) -> Shadow {
+    Shadow {
+        color: ColorRef::rgb(if inner { Rgba::rgb(0, 0, 80) } else { Rgba::BLACK }).with(ColorTransform::Alpha(50_000)),
+        blur: if inner { 4.0 } else { 8.0 },
+        dist: if inner { 2.0 } else { 5.0 },
+        dir,
+        inner,
+        sx: if inner { 1.0 } else { 0.5 },
+        sy: 1.0,
+        kx: 0.0,
+        ky: if inner { 0.0 } else { 15.0 },
+        align: if inner { String::new() } else { "ctr".into() },
+        rotate_with_shape: inner,
+    }
+}
+
+fn glow() -> Glow {
+    Glow { color: ColorRef::scheme(SchemeSlot::Accent3), radius: 10.0 }
+}
+
+fn reflection() -> Reflection {
+    Reflection { blur: 2.0, start_alpha: 0.5, end_alpha: 0.0, end_pos: 0.75, dist: 6.0 }
+}
+
+fn gradient(angle: f64) -> Fill {
+    Fill::Gradient(Gradient {
+        stops: vec![
+            GradientStop { pos: 0.0, color: ColorRef::rgb(Rgba::rgb(255, 80, 0)) },
+            GradientStop { pos: 1.0, color: ColorRef::scheme(SchemeSlot::Accent1) },
+        ],
+        shape: GradientShape::Linear { angle, scaled: true },
+        rotate_with_shape: true,
+        tile: [0.0; 4],
+    })
+}
+
+fn styled_run() -> RunProps {
+    RunProps {
+        fill: Some(gradient(20.0)),
+        outline: Some(Line { dash: Some(Dash::Preset { name: "dash".into() }), ..Line::solid(ColorRef::rgb(Rgba::rgb(0, 40, 80)), 1.5) }),
+        shadow: Some(shadow(false, 135.0)),
+        inner_shadow: Some(shadow(true, 45.0)),
+        glow: Some(glow()),
+        reflection: Some(reflection()),
+        soft_edge: Some(4.0),
+        ..Default::default()
+    }
+}
+
+fn style_deck() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let master = Arc::make_mut(p.masters.first_mut().expect("master"));
+    master.theme.format.effects[0] = Effects {
+        glow: Some(glow()),
+        reflection: Some(reflection()),
+        // Preset only: no kept `scene3d`/`sp3d`. A save must still write the bevel.
+        bevel: Some("circle".into()),
+        ..Default::default()
+    };
+
+    let layout = defaults::layout_of_kind(&p, deckcraft_model::LayoutType::Blank).unwrap_or_default();
+    let mut s = defaults::new_slide(&mut p, layout);
+
+    let mut word = shape(&mut p, "Styled text", 40.0, 40.0, 400.0, 180.0);
+    word.text = Some(TextBody {
+        body: BodyProps {
+            autofit: Some(AutoFit::Shrink { font_scale: 0.8, line_reduction: 0.2 }),
+            columns: Some(2),
+            col_spacing: Some(12.0),
+            vert: Some(TextDir::Vertical270),
+            rtl_col: Some(true),
+            ..Default::default()
+        },
+        paragraphs: vec![Paragraph {
+            props: ParaProps {
+                align: Some(Align::Right),
+                rtl: Some(true),
+                line_spacing: Some(Spacing::Pct(1.5)),
+                space_before: Some(Spacing::Pts(6.0)),
+                tabs: Some(vec![
+                    TabStop { pos: 36.0, align: "l".into() },
+                    TabStop { pos: 72.0, align: "ctr".into() },
+                    TabStop { pos: 108.0, align: "r".into() },
+                    TabStop { pos: 144.0, align: "dec".into() },
+                ]),
+                ..Default::default()
+            },
+            runs: vec![Run::with("Gradient glow", styled_run())],
+            ..Default::default()
+        }],
+        ..Default::default()
+    });
+
+    let mut path = shape(&mut p, "Path gradient", 40.0, 260.0, 140.0, 100.0);
+    path.fill = Some(Fill::Gradient(Gradient {
+        stops: vec![
+            GradientStop { pos: 0.0, color: ColorRef::rgb(Rgba::rgb(10, 20, 30)) },
+            GradientStop { pos: 0.5, color: ColorRef::scheme(SchemeSlot::Accent5) },
+            GradientStop { pos: 1.0, color: ColorRef::rgb(Rgba::rgb(240, 240, 240)) },
+        ],
+        shape: GradientShape::Path { path: "circle".into(), focus: [0.2, 0.2, 0.2, 0.2] },
+        rotate_with_shape: false,
+        tile: [0.0; 4],
+    }));
+
+    let mut patt = shape(&mut p, "Pattern", 200.0, 260.0, 120.0, 80.0);
+    patt.fill =
+        Some(Fill::Pattern(PatternFill { preset: "smCheck".into(), fg: ColorRef::scheme(SchemeSlot::Accent4), bg: ColorRef::rgb(Rgba::WHITE) }));
+
+    let mut named = shape(&mut p, "Bevel preset", 460.0, 260.0, 80.0, 60.0);
+    named.effects = Some(Effects { bevel: Some("relaxedInset".into()), ..Default::default() });
+
+    let mut bevel = shape(&mut p, "Bevel", 340.0, 260.0, 100.0, 80.0);
+    bevel.effects = Some(Effects {
+        raw3d: Some(
+            "<a:scene3d><a:camera prst=\"orthographicFront\"><a:rot lat=\"0\" lon=\"0\" rev=\"0\"/></a:camera><a:lightRig rig=\"threePt\" dir=\"t\"/></a:scene3d><a:sp3d><a:bevelT w=\"63500\" h=\"25400\" prst=\"angle\"/></a:sp3d>"
+                .into(),
+        ),
+        ..Default::default()
+    });
+
+    let left = shape(&mut p, "Left", 40.0, 400.0, 80.0, 40.0);
+    let right = shape(&mut p, "Right", 240.0, 400.0, 80.0, 40.0);
+    let (left_id, right_id) = (left.id, right.id);
+    let mut cx = shape(&mut p, "Connector", 120.0, 420.0, 120.0, 0.0);
+    cx.kind = ShapeKind::Connector { start: Some((left_id, 3)), end: Some((right_id, 1)) };
+    cx.geom = Geom::preset("straightConnector1");
+    cx.line = Some(Line::solid(ColorRef::scheme(SchemeSlot::Tx1), 1.5));
+
+    s.shapes.extend([word, path, patt, named, bevel, left, right, cx]);
+    p.slides.push(Arc::new(s));
+    p
+}
+
+fn round(p: &Presentation) -> Presentation {
+    let bytes = deckcraft_pptx::export(p).expect("export");
+    deckcraft_pptx::import(&bytes).expect("import")
+}
+
+fn by_name<'a>(p: &'a Presentation, name: &str) -> &'a Shape {
+    p.slides.iter().flat_map(|s| &s.shapes).find(|s| s.name == name).unwrap_or_else(|| panic!("missing {name}"))
+}
+
+fn run_of(p: &Presentation) -> &RunProps {
+    &by_name(p, "Styled text").text.as_ref().expect("text").paragraphs[0].runs[0].props
+}
+
+#[test]
+fn style_kinds_round_trip() {
+    let p = style_deck();
+    let once = round(&p);
+    let twice = round(&once);
+
+    let body = &by_name(&once, "Styled text").text.as_ref().expect("text").body;
+    assert_eq!(body.autofit, Some(AutoFit::Shrink { font_scale: 0.8, line_reduction: 0.2 }));
+    assert_eq!(body.columns, Some(2));
+    assert_eq!(body.col_spacing, Some(12.0));
+    assert_eq!(body.vert, Some(TextDir::Vertical270));
+    assert_eq!(body.rtl_col, Some(true));
+    let para = &by_name(&once, "Styled text").text.as_ref().expect("text").paragraphs[0].props;
+    assert_eq!(para.rtl, Some(true));
+    assert_eq!(para.align, Some(Align::Right));
+    assert_eq!(para.line_spacing, Some(Spacing::Pct(1.5)));
+    assert_eq!(para.space_before, Some(Spacing::Pts(6.0)));
+    assert_eq!(
+        para.tabs.as_deref(),
+        Some(
+            [
+                TabStop { pos: 36.0, align: "l".into() },
+                TabStop { pos: 72.0, align: "ctr".into() },
+                TabStop { pos: 108.0, align: "r".into() },
+                TabStop { pos: 144.0, align: "dec".into() },
+            ]
+            .as_slice()
+        )
+    );
+
+    let got = run_of(&once);
+    let expect = run_of(&p);
+    assert_eq!(got.fill, expect.fill, "text gradient");
+    assert_eq!(got.outline, expect.outline, "text outline");
+    assert_eq!(got.shadow, expect.shadow, "text shadow");
+    assert_eq!(got.glow, expect.glow, "text glow");
+    assert_eq!(got.inner_shadow, expect.inner_shadow, "text inner shadow");
+    assert_eq!(got.reflection, expect.reflection, "text reflection");
+    assert_eq!(got.soft_edge, expect.soft_edge, "text soft edge");
+    assert_eq!(run_of(&twice), run_of(&once));
+    assert_eq!(
+        by_name(&twice, "Styled text").text.as_ref().map(|t| (&t.body, &t.paragraphs[0].props)),
+        by_name(&once, "Styled text").text.as_ref().map(|t| (&t.body, &t.paragraphs[0].props))
+    );
+
+    assert_eq!(by_name(&once, "Path gradient").fill, by_name(&p, "Path gradient").fill);
+    assert_eq!(by_name(&once, "Pattern").fill, by_name(&p, "Pattern").fill);
+    assert_eq!(by_name(&twice, "Path gradient").fill, by_name(&once, "Path gradient").fill);
+    assert_eq!(by_name(&twice, "Pattern").fill, by_name(&once, "Pattern").fill);
+
+    let theme = &once.masters[0].theme.format.effects[0];
+    assert_eq!(theme.glow, Some(glow()));
+    assert_eq!(theme.reflection, Some(reflection()));
+    assert_eq!(theme.bevel.as_deref(), Some("circle"), "theme bevel preset");
+    let theme2 = &twice.masters[0].theme.format.effects[0];
+    assert_eq!(theme2.glow, theme.glow);
+    assert_eq!(theme2.reflection, theme.reflection);
+    assert_eq!(theme2.bevel, theme.bevel);
+    assert_eq!(theme2.raw3d, theme.raw3d);
+
+    let named = by_name(&once, "Bevel preset").effects.as_ref().expect("effects");
+    assert_eq!(named.bevel.as_deref(), Some("relaxedInset"));
+    assert!(named.raw3d.as_deref().unwrap_or("").contains("relaxedInset"));
+    assert_eq!(by_name(&twice, "Bevel preset").effects.as_ref().and_then(|e| e.bevel.as_deref()), Some("relaxedInset"));
+
+    let bevel = by_name(&once, "Bevel").effects.as_ref().expect("effects");
+    assert_eq!(bevel.bevel.as_deref(), Some("angle"));
+    let raw = bevel.raw3d.as_deref().unwrap_or("");
+    assert!(raw.contains("bevelT") && raw.contains("angle") && raw.contains("scene3d"), "{raw}");
+    assert_eq!(by_name(&twice, "Bevel").effects.as_ref().and_then(|e| e.raw3d.as_deref()), Some(raw));
+
+    let c = by_name(&once, "Connector");
+    assert!(
+        matches!(c.kind, ShapeKind::Connector { start: Some((s, 3)), end: Some((e, 1)) } if s == left_of(&p) && e == right_of(&p)),
+        "{:?}",
+        c.kind
+    );
+    assert_eq!(c.line, by_name(&p, "Connector").line);
+    assert_eq!(c.geom, by_name(&p, "Connector").geom);
+    assert_eq!(by_name(&twice, "Connector").kind, c.kind);
+}
+
+fn left_of(p: &Presentation) -> ShapeId {
+    by_name(p, "Left").id
+}
+fn right_of(p: &Presentation) -> ShapeId {
+    by_name(p, "Right").id
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..a1e64c7c 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus for text effects, body layout, theme effects, fills, bevels and connectors; a run's inner shadow, reflection and soft edge, and a bevel preset with no kept 3-D XML, survive a save; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -16,7 +16,7 @@ PowerPoint opens and saves; Viewer = opens only).
 
 | Format | PowerPoint | DeckCraft read | DeckCraft write | Fidelity / notes | Tested by |
 |---|---|---|---|---|---|
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); never measured on real decks | `crates/pptx/tests/roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs` (30 tests); opened in PowerPoint by hand 2026-10-06 |
+| `.pptx` presentation | Editor | yes | yes | Broad (see below); an owned corpus covers text effects, autofit, columns, vertical and RTL text, tabs, line spacing, theme effects, gradient and pattern fills, bevels and connectors. A corpus of decks from outside this repo is still open | `crates/pptx/tests/roundtrip.rs`, `corpus_style.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
 | `.potx` template | Editor | yes (as a presentation) | no: written with the `.pptx` content type | `file.saveTemplate` is Save As under another name | none |
 | `.ppsx` slide show | Editor | yes (as a presentation) | no: written as `.pptx` content | Doesn't start in show mode | none |
 | `.pptm` / `.potm` / `.ppsm` macro-enabled | Editor | no | no | Should open and keep `vbaProject.bin` without running it | none |
@@ -66,9 +66,9 @@ the round trip even though DeckCraft doesn't model it.
 | Shapes: preset geometry (~180 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in `crates/geom/src/preset.rs` (and `preset/extra.rs`). Outlines, dashes, arrowheads and ink inside a group, and text, keep their size in points whatever the group's child-coordinate scale (#233). |
 | Fills: solid, gradient, picture (stretch/tile/crop), pattern, group | yes | yes | |
 | Lines: dash, compound, caps, joins, arrowheads | yes | yes | |
-| Effects: shadow, glow, soft edges, reflection | yes | yes | |
-| 3-D: `scene3d`, `sp3d` | kept | kept | Not rendered |
-| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow` and date fields |
+| Effects: shadow, glow, soft edges, reflection | yes | yes | On a run, inner shadow, reflection and soft edges are kept along with the outer shadow and glow |
+| 3-D: `scene3d`, `sp3d` | kept | kept | A bevel preset with no `sp3d` of its own is written back on shapes and theme effect styles. Bevels, cameras and face lighting draw approximately; extrusion does not |
+| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow`, date fields, gradient and outline on a run, autofit, columns, vertical and RTL text, tab stops and line spacing (`corpus_style.rs`) |
 | Text warp (`prstTxWarp`) | yes | yes | All 40 presets rendered (`crates/geom/src/warp.rs`); adjust values (`avLst`) round-trip |
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Owned corpus for text effects, body layout, theme effects, fills, bevels and connectors. A run's inner shadow, reflection and soft edge, and a bevel preset with no kept 3-D XML, survive a save |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..3a6e1fe0 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned PPTX corpus for text effects, body layout, theme effects, fills, bevels and connectors; run effect lists and bevel presets kept; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -59,9 +59,14 @@ revision history.
 Detail in [file-format-parity.md](file-format-parity.md).
 
 ### PPTX has never met a corpus of real decks
-- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests) uses decks DeckCraft generates;
-  the 2026-10-07 alpha checklist already listed this as open. No reference renders from PowerPoint
-  exist to compare against.
+- **Evidence:** PPTX tests use decks DeckCraft generates. An owned check
+  (`crates/pptx/tests/corpus_style.rs`) now opens, saves and reopens text effects (gradient, outline,
+  shadow, glow, inner shadow, reflection and soft edge), autofit, columns, vertical and RTL text,
+  tab stops, line spacing, theme effects, gradient and pattern fills, 3-D bevels and connectors.
+  That check found a run's inner shadow, reflection and soft edge were dropped, and a bevel preset
+  with no kept `sp3d` was not written back; both are kept now. Comment threads (#70), media options
+  (#74), animation rewind (#77) and embedded fonts are still open, and there is no corpus of decks
+  from outside this repo. No reference renders from PowerPoint exist to compare against.
 - **Impact:** the main reason to switch is "open my PowerPoint decks". Fidelity on real decks
   (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is unknown.
 - **Estimate:** 20–35 h: build an owned corpus in `storytold/photocraft-corpus` style (craftrules
@@ -256,6 +261,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Owned PPTX corpus for text effects, body layout, theme effects, fills, bevels and connectors. A run's inner shadow, reflection and soft edge, and a bevel preset with no kept 3-D XML, are kept. #70, #74, #77 and embedded fonts stay open |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..687a2adc 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus covers text effects, body layout, theme effects, fills, bevels and connectors; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -26,8 +26,11 @@ points and lead the beta plan.
 
 1. **Stop losing work and crashing:** land Close's save prompt (#60, PR #75), the Windows GPU
    startup crashes (#40, #59), image paste on Windows/Linux (#53). 6–12 h.
-2. **PPTX on real decks:** build an owned corpus, round-trip checks in CI, fix what breaks;
-   comment threads, media options and rewind on save (#70, #74, #77); EMF/WMF and SVG. 31–55 h.
+2. **PPTX on real decks:** the owned corpus now round-trips text effects, autofit, columns,
+   vertical and RTL text, tab stops, line spacing, theme effects, gradient and pattern fills, 3-D
+   bevels and connectors, and keeps a run's inner shadow, reflection and soft edge plus a bevel
+   preset that had no 3-D XML. Still open: a larger corpus, embedded fonts, comment threads, media
+   options and rewind (#70, #74, #77), EMF/WMF and SVG. 31–55 h.
 3. **Review the open PRs:** equations (#55), browser print (#66), Morph alignment (#67), macOS
    open-with (#68), font lookup (#80), Ukrainian (#34, after the catalog exists). 4–8 h.
 
@@ -96,7 +99,7 @@ on common paths. On 2026-10-07 it was ~80% there with these blockers:
 | Blocker (2026-10-07) | Status 2026-10-10 |
 |---|---|
 | First real release run: signing, notarization, installers verified on each OS | Signed releases v0.1.0–v0.4.0 published; installers not hand-checked on each OS; Windows startup crashes on some GPUs (#40, #59) |
-| PPTX fidelity on a corpus of real decks | Still open; now beta item 2 |
+| PPTX fidelity on a corpus of real decks | Owned check for text effects, body layout, theme effects, fills, bevels and connectors. A larger corpus, embedded fonts and #70/#74/#77 stay open; beta item 2 |
 | Presenter view and Animation Pane polish | Still open; beta items 9 and 10 |
 | Soak and fuzz the editor | Still open; beta item 1 |
 | UI fidelity pass on the most-used ribbon groups and dialogs; first run | Partly (start-screen fixes #20, #49); beta item 11 |
@@ -109,5 +112,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Owned PPTX corpus covers text effects, body layout, theme effects, fills, bevels and connectors. Beta item 2 stays open for a larger corpus, embedded fonts and #70/#74/#77 |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |

From 88bea399e5904533ef915a45c3ce10b3891e5f87 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:04:51 +0300
Subject: [PATCH 191/376] UI: customizable Quick Access Toolbar

The title bar's quick access buttons become a list the user controls:
a Customize menu with PowerPoint's common commands and Reset, right-click
any ribbon button to add it, right-click a toolbar button to remove it.
The toolbar is saved with the UI state; app.qat scripts it.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/ui-egui/src/lib.rs    |  40 +++++++++
 crates/ui-egui/src/qat.rs    | 170 +++++++++++++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs |  33 +++----
 docs/parity-checklist.md     |   8 +-
 docs/ui-parity.md            |   2 +-
 5 files changed, 229 insertions(+), 24 deletions(-)
 create mode 100644 crates/ui-egui/src/qat.rs

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..a7dbe5aa 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -16,6 +16,7 @@ pub mod icons;
 pub mod media;
 pub mod menus;
 pub mod panes;
+pub mod qat;
 pub mod ribbon;
 pub mod selpane;
 pub mod show;
@@ -102,6 +103,8 @@ pub struct UiState {
     /// Format Shape pane: tab (`fill`, `effects`, `size`, `picture`, `text`).
     pub format_tab: String,
     pub grayscale: bool,
+    /// Quick Access Toolbar buttons, left to right.
+    pub qat: Vec<qat::QatItem>,
 }
 
 impl Default for UiState {
@@ -127,6 +130,7 @@ impl Default for UiState {
             ui_scale: 1.0,
             format_tab: "fill".into(),
             grayscale: false,
+            qat: qat::defaults(),
         }
     }
 }
@@ -168,6 +172,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.saveAsDialog", "Save As…", None, "{}"),
     ("app.exportDialog", "Export…", None, "{}"),
     ("app.dialog", "Open Dialog", None, "{id}"),
+    ("app.qat", "Quick Access Toolbar", None, "{add: command id, params?, label?, icon?} | {remove: id, params?} | {reset: true} → [buttons]"),
     ("app.links", "Community Links", None, "{}"),
 ];
 
@@ -541,6 +546,7 @@ impl SlideApp {
             "app.insertVideoDialog" => self.pick_and_insert("video", "insert.video"),
             "app.saveAsDialog" => self.save_as_dialog("deckcraft"),
             "app.exportDialog" => self.dialog = Some(dialogs::Dialog::new("export")),
+            "app.qat" => return qat::command(self, p),
             "app.dialog" => {
                 let d = p.get("id").and_then(Value::as_str).ok_or("missing `id`")?;
                 self.dialog = Some(dialogs::Dialog::new(d));
@@ -1142,6 +1148,40 @@ mod tests {
         sh.text.as_ref().map(|t| t.paragraphs.iter().map(|p| p.text()).collect::<Vec<_>>().join("\n")).unwrap_or_default()
     }
 
+    #[test]
+    fn quick_access_toolbar_adds_removes_resets_and_persists() {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        let ids = |app: &SlideApp| app.ui.qat.iter().map(|q| q.id.clone()).collect::<Vec<_>>();
+        assert_eq!(ids(harness.state()), ["app.home", "file.save", "edit.undo", "edit.redo", "show.fromStart"]);
+        let app = harness.state_mut();
+        app.run("app.qat", json!({"add": "insert.table", "label": "Table", "icon": "table"})).unwrap();
+        app.run("app.qat", json!({"add": "insert.table"})).unwrap();
+        app.run("app.qat", json!({"add": "view.pane", "params": {"pane": "selection"}, "label": "Selection Pane"})).unwrap();
+        assert!(app.run("app.qat", json!({"add": "no.such"})).is_err());
+        app.run("app.qat", json!({"remove": "edit.redo"})).unwrap();
+        assert_eq!(ids(app), ["app.home", "file.save", "edit.undo", "show.fromStart", "insert.table", "view.pane"]);
+        assert_eq!(app.ui.qat[4].label, "Table");
+        // Saved with the rest of the UI state and read back.
+        let back: UiState = serde_json::from_value(serde_json::to_value(&app.ui).unwrap()).unwrap();
+        assert_eq!(back.qat, app.ui.qat);
+        harness.run_steps(2);
+        let app = harness.state_mut();
+        app.run("app.qat", json!({"remove": "view.pane", "params": {"pane": "selection"}})).unwrap();
+        assert_eq!(app.ui.qat.len(), 5);
+        app.run("app.qat", json!({"reset": true})).unwrap();
+        assert_eq!(ids(app), ["app.home", "file.save", "edit.undo", "edit.redo", "show.fromStart"]);
+        // An older settings file without the toolbar gets the defaults.
+        let old: UiState = serde_json::from_value(json!({"tab": "Home"})).unwrap();
+        assert_eq!(old.qat.len(), 5);
+    }
+
     #[test]
     fn opening_a_file_with_missing_fonts_shows_a_toast_once() {
         use egui_kittest::kittest::Queryable;
diff --git a/crates/ui-egui/src/qat.rs b/crates/ui-egui/src/qat.rs
new file mode 100644
index 00000000..85ab77af
--- /dev/null
+++ b/crates/ui-egui/src/qat.rs
@@ -0,0 +1,170 @@
+//! Quick Access Toolbar: the command buttons at the left of the title bar, which the user can
+//! add to (right-click a ribbon button, or the toolbar's Customize menu), remove from and reset.
+
+use egui::Ui;
+use serde::{Deserialize, Serialize};
+use serde_json::{Value, json};
+
+use crate::SlideApp;
+use crate::icons::Icon;
+
+/// One toolbar button: a command, its parameters, and how it looks.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+#[serde(default, rename_all = "camelCase")]
+pub struct QatItem {
+    pub id: String,
+    #[serde(skip_serializing_if = "Value::is_null")]
+    pub params: Value,
+    pub label: String,
+    /// An [`Icon::name`].
+    pub icon: String,
+}
+
+impl Default for QatItem {
+    fn default() -> Self {
+        QatItem { id: String::new(), params: Value::Null, label: String::new(), icon: Icon::More.name().into() }
+    }
+}
+
+impl QatItem {
+    pub fn new(id: &str, label: &str, icon: Icon) -> Self {
+        QatItem { id: id.into(), params: Value::Null, label: label.into(), icon: icon.name().into() }
+    }
+    fn icon(&self) -> Icon {
+        Icon::from_name(&self.icon).unwrap_or(Icon::More)
+    }
+    fn same(&self, id: &str, params: &Value) -> bool {
+        self.id == id && (self.params == *params || (self.params.is_null() && params.as_object().is_some_and(|o| o.is_empty())))
+    }
+}
+
+/// The commands the Customize menu offers as checkboxes, in PowerPoint's order.
+pub fn common() -> Vec<QatItem> {
+    vec![
+        QatItem::new("app.home", "Home", Icon::Home),
+        QatItem::new("file.new", "New", Icon::File),
+        QatItem::new("app.openDialog", "Open", Icon::Folder),
+        QatItem::new("file.save", "Save", Icon::Save),
+        QatItem::new("app.print", "Print", Icon::Print),
+        QatItem::new("edit.undo", "Undo", Icon::Undo),
+        QatItem::new("edit.redo", "Redo", Icon::Redo),
+        QatItem::new("show.fromStart", "Start from Beginning", Icon::PlayFromStart),
+        QatItem::new("app.find", "Find", Icon::Search),
+        QatItem::new("review.spelling", "Spelling", Icon::Spelling),
+        QatItem::new("app.exportDialog", "Export", Icon::Export),
+    ]
+}
+
+/// The toolbar a new install starts with.
+pub fn defaults() -> Vec<QatItem> {
+    common().into_iter().filter(|q| matches!(q.id.as_str(), "app.home" | "file.save" | "edit.undo" | "edit.redo" | "show.fromStart")).collect()
+}
+
+/// `app.qat`: `{add: id, params?, label?, icon?} | {remove: id, params?} | {reset: true}` → the toolbar.
+pub fn command(app: &mut SlideApp, p: &Value) -> Result<Value, String> {
+    let params = p.get("params").cloned().unwrap_or(Value::Null);
+    if p.get("reset").and_then(Value::as_bool) == Some(true) {
+        app.ui.qat = defaults();
+    }
+    if let Some(id) = p.get("add").and_then(Value::as_str) {
+        if !crate::ribbon::known(id) {
+            return Err(format!("unknown command `{id}`"));
+        }
+        if !app.ui.qat.iter().any(|q| q.same(id, &params)) {
+            let base = common().into_iter().find(|q| q.id == id);
+            let label = p.get("label").and_then(Value::as_str).map(String::from).or_else(|| base.as_ref().map(|b| b.label.clone()));
+            let label = label.or_else(|| deckcraft_engine::find_command(id).map(|c| c.label.to_string())).unwrap_or_else(|| id.to_string());
+            let icon = p.get("icon").and_then(Value::as_str).and_then(Icon::from_name).or_else(|| base.map(|b| b.icon())).unwrap_or(Icon::More);
+            app.ui.qat.push(QatItem { id: id.into(), params: params.clone(), label, icon: icon.name().into() });
+        }
+    }
+    if let Some(id) = p.get("remove").and_then(Value::as_str) {
+        app.ui.qat.retain(|q| !q.same(id, &params));
+    }
+    serde_json::to_value(&app.ui.qat).map_err(|e| e.to_string())
+}
+
+fn run(app: &mut SlideApp, q: &QatItem) {
+    match q.id.as_str() {
+        "file.save" => app.save(),
+        "show.fromStart" => app.start_show(0, false),
+        "review.spelling" => app.dialog = Some(crate::dialogs::Dialog::new("spelling")),
+        id => {
+            let p = if q.params.is_null() { json!({}) } else { q.params.clone() };
+            let _ = app.run(id, p);
+        }
+    }
+}
+
+fn tip(q: &QatItem) -> String {
+    let sc =
+        deckcraft_engine::find_command(&q.id).and_then(|c| c.shortcut).or_else(|| crate::UI_COMMANDS.iter().find(|c| c.0 == q.id).and_then(|c| c.2));
+    match sc {
+        Some(s) => format!("{} ({})", q.label, crate::ribbon::pretty_shortcut(s)),
+        None => q.label.clone(),
+    }
+}
+
+/// Draw the toolbar and its Customize menu into a left-to-right row of the title bar.
+pub fn show(app: &mut SlideApp, ui: &mut Ui) {
+    let items = app.ui.qat.clone();
+    for q in &items {
+        let on = q.id == "app.home" && app.backstage_open();
+        let en = match q.id.as_str() {
+            "app.home" => true,
+            "file.save" | "show.fromStart" | "review.spelling" | "app.find" => app.session.active().is_some(),
+            id => crate::ribbon::enabled(app, id),
+        };
+        let r = crate::widgets::icon_toggle(ui, q.icon(), &tip(q), en, on);
+        if r.clicked() {
+            run(app, q);
+        }
+        r.context_menu(|ui| {
+            if ui.button("Remove from Quick Access Toolbar").clicked() {
+                let _ = command(app, &json!({"remove": q.id, "params": q.params}));
+                ui.close();
+            }
+        });
+    }
+    let r = crate::widgets::icon_toggle(ui, Icon::ChevronDown, "Customize Quick Access Toolbar", true, false);
+    egui::Popup::menu(&r).show(|ui| {
+        ui.label(egui::RichText::new("Customize Quick Access Toolbar").strong());
+        for c in common() {
+            let mut on = app.ui.qat.iter().any(|q| q.same(&c.id, &Value::Null));
+            if ui.checkbox(&mut on, &c.label).changed() {
+                let key = if on { "add" } else { "remove" };
+                let _ = command(app, &json!({key: c.id}));
+            }
+        }
+        let extra: Vec<QatItem> = app.ui.qat.iter().filter(|q| !common().iter().any(|c| q.same(&c.id, &Value::Null))).cloned().collect();
+        if !extra.is_empty() {
+            ui.separator();
+            for q in extra {
+                let mut on = true;
+                if ui.checkbox(&mut on, &q.label).changed() {
+                    let _ = command(app, &json!({"remove": q.id, "params": q.params}));
+                }
+            }
+        }
+        ui.separator();
+        ui.label(egui::RichText::new("Right-click any ribbon button to add it.").weak());
+        if ui.button("Reset to Defaults").clicked() {
+            let _ = command(app, &json!({"reset": true}));
+            ui.close();
+        }
+    });
+}
+
+/// The ribbon buttons' right-click menu: add the button to the toolbar.
+pub fn ribbon_menu(app: &mut SlideApp, r: &egui::Response, icon: Icon, label: &str, id: &str, p: &Value) {
+    r.context_menu(|ui| {
+        let has = app.ui.qat.iter().any(|q| q.same(id, p));
+        let text = if has { "Remove from Quick Access Toolbar" } else { "Add to Quick Access Toolbar" };
+        if ui.button(text).clicked() {
+            let label = label.replace('\n', " ");
+            let key = if has { "remove" } else { "add" };
+            let _ = command(app, &json!({key: id, "params": p, "label": label, "icon": icon.name()}));
+            ui.close();
+        }
+    });
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..03e8090f 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -13,6 +13,11 @@ use crate::widgets::{self, RIBBON_H, big_button, big_button_ex, color_split, dro
 pub const TITLE_H: f32 = 38.0;
 
 /// Is engine command `id` enabled right now?
+/// Whether `id` names an engine or UI command.
+pub fn known(id: &str) -> bool {
+    deckcraft_engine::find_command(id).is_some() || crate::UI_COMMANDS.iter().any(|c| c.0 == id)
+}
+
 pub fn enabled(app: &SlideApp, id: &str) -> bool {
     match deckcraft_engine::find_command(id) {
         Some(c) => (c.enabled)(&app.session).is_ok(),
@@ -47,21 +52,7 @@ pub fn title_bar(app: &mut SlideApp, ui: &mut Ui) {
         child.spacing_mut().item_spacing.x = 2.0;
         let has_doc = app.session.active().is_some();
         let dirty = app.session.active().is_some_and(|d| d.is_dirty());
-        if icon_toggle(&mut child, Icon::Home, "Home", true, app.backstage_open()).clicked() {
-            let _ = app.run("app.home", json!({}));
-        }
-        if icon_toggle(&mut child, Icon::Save, "Save (⌘S)", has_doc, false).clicked() {
-            app.save();
-        }
-        if icon_toggle(&mut child, Icon::Undo, "Undo (⌘Z)", enabled(app, "edit.undo"), false).clicked() {
-            run(app, "edit.undo", json!({}));
-        }
-        if icon_toggle(&mut child, Icon::Redo, "Redo (⌘Y)", enabled(app, "edit.redo"), false).clicked() {
-            run(app, "edit.redo", json!({}));
-        }
-        if icon_toggle(&mut child, Icon::PlayFromStart, "Play from Start (F5)", has_doc, false).clicked() {
-            app.start_show(0, false);
-        }
+        crate::qat::show(app, &mut child);
         let title =
             app.session.active().map(|d| format!("{}{}", d.title(), if dirty { " — Edited" } else { "" })).unwrap_or_else(|| "DeckCraft".into());
         ui.painter().text(rect.center(), Align2::CENTER_CENTER, title, theme::font(13.0), t.text);
@@ -229,16 +220,20 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
 
 fn big(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, id: &str, p: Value) {
     let en = enabled(app, id);
-    if big_button(ui, icon, label, en).on_hover_text(tip(id, label)).clicked() {
-        run(app, id, p);
+    let r = big_button(ui, icon, label, en).on_hover_text(tip(id, label));
+    if r.clicked() {
+        run(app, id, p.clone());
     }
+    crate::qat::ribbon_menu(app, &r, icon, label, id, &p);
 }
 
 fn small(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, id: &str, p: Value) {
     let en = enabled(app, id);
-    if small_button(ui, icon, label, en, false).on_hover_text(tip(id, label)).clicked() {
-        run(app, id, p);
+    let r = small_button(ui, icon, label, en, false).on_hover_text(tip(id, label));
+    if r.clicked() {
+        run(app, id, p.clone());
     }
+    crate::qat::ribbon_menu(app, &r, icon, label, id, &p);
 }
 
 fn toggle(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, id: &str, on: bool) {
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..d5399b8f 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -3,17 +3,17 @@
 > **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 79%** over 191 features.
+**Weighted breadth parity: 80%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
+| P1 | 65 | 39 | 20 | 6 | 75% |
 | P2 | 54 | 13 | 15 | 26 | 38% |
 
 | Area | Parity |
 |---|---|
-| Application shell | 77% |
+| Application shell | 81% |
 | Files | 71% |
 | Slides | 90% |
 | Views | 90% |
@@ -45,7 +45,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Application shell | Start screen (new, templates/themes, recent) | P0 | D |
 | Application shell | Ribbon with Home/Insert/Draw/Design/Transitions/Animations/Slide Show/Review/View tabs | P0 | D |
 | Application shell | Contextual tabs (Shape Format, Picture Format, Table Design/Layout, Chart Design) | P0 | P |
-| Application shell | Quick Access toolbar / title bar commands | P1 | P |
+| Application shell | Quick Access toolbar / title bar commands | P1 | D |
 | Application shell | Native menu bar (macOS) with every command | P1 | M |
 | Application shell | Command palette / Tell me search | P1 | D |
 | Application shell | Keyboard shortcuts for every common command | P0 | D |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..02e25474 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -24,7 +24,7 @@ AGENTS.md §2). Dimension score: **~60% ready** (estimated), **30–50 h** to pa
 | Command search (Tell Me) | yes | command palette | #79 default entry fails |
 | Light / dark appearance | follows the system | light or dark; doesn't follow the system (#41) | 1–2 h |
 | One window per presentation, New Window, Arrange All | yes | tabs in one window; no New Window | 3–5 h |
-| Quick Access Toolbar customization | yes | no | P1 partial |
+| Quick Access Toolbar customization | yes | yes: Customize menu (common commands, reset), right-click any ribbon button to add, right-click a toolbar button to remove; saved with the UI state | done |
 
 ## File tab (Backstage)
 

From 5bdfc3228d16e96d64ac156d13d1a3c7e403aa61 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:05:47 +0300
Subject: [PATCH 192/376] Add a performance baseline: deckcraft-cli bench and
 cargo xtask bench

Times open, per-slide render, save, the PPTX round trip and PDF export, and
reports peak memory; xtask builds the CLI in release, runs it on the sample
and any given decks, and compares with docs/benchmarks/baseline.json.
---
 apps/deckcraft-cli/src/main.rs | 105 +++++++++++++++++++++++++++++++++
 docs/gaps.md                   |   7 ++-
 xtask/src/bench.rs             |  75 +++++++++++++++++++++++
 xtask/src/main.rs              |   5 ++
 4 files changed, 190 insertions(+), 2 deletions(-)
 create mode 100644 xtask/src/bench.rs

diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index fd1d96ea..a7b2fcff 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -10,6 +10,7 @@
 //! deckcraft-cli describe ID                     # one command
 //! deckcraft-cli app [--port PORT] COMMAND [JSON] | --method METHOD [JSON]   # drive the running app
 //! deckcraft-cli mcp [--connect PORT] [--sample] # MCP server over stdio
+//! deckcraft-cli bench [FILE | --sample] [--runs N] [--json]   # time open, render, save, export
 //! deckcraft-cli links | --version
 //! ```
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
@@ -42,6 +43,7 @@ const USAGE: &str = "usage: deckcraft-cli info FILE
        deckcraft-cli describe COMMAND
        deckcraft-cli app [--port PORT] COMMAND [JSON] | --method METHOD [JSON]
        deckcraft-cli mcp [--connect PORT] [--sample]
+       deckcraft-cli bench [FILE | --sample] [--runs N] [--json]
        deckcraft-cli links | --version";
 
 fn main() -> ExitCode {
@@ -53,6 +55,7 @@ fn main() -> ExitCode {
             ExitCode::SUCCESS
         }
         Some("info") => report(info(rest)),
+        Some("bench") => report(bench(rest)),
         Some("render") => report(render(rest)),
         Some("render-transition") => report(render_transition(rest)),
         Some("convert") => report(convert(rest)),
@@ -105,6 +108,108 @@ fn open(s: &mut Session, input: Option<&str>, sample: bool) -> Result<(), String
     }
 }
 
+/// Median and slowest of `runs` timings of `f`, in milliseconds.
+fn time_ms(runs: usize, mut f: impl FnMut() -> Result<(), String>) -> Result<(f64, f64), String> {
+    let mut ms = Vec::with_capacity(runs);
+    for _ in 0..runs.max(1) {
+        let t = std::time::Instant::now();
+        f()?;
+        ms.push(t.elapsed().as_secs_f64() * 1000.0);
+    }
+    ms.sort_by(f64::total_cmp);
+    let median = ms.get(ms.len() / 2).copied().unwrap_or(0.0);
+    Ok((median, ms.last().copied().unwrap_or(0.0)))
+}
+
+/// Peak resident memory of this process in MiB (Linux `VmHWM`); `None` elsewhere.
+fn peak_rss_mib() -> Option<f64> {
+    let s = std::fs::read_to_string("/proc/self/status").ok()?;
+    let kb: f64 = s.lines().find_map(|l| l.strip_prefix("VmHWM:"))?.trim().trim_end_matches("kB").trim().parse().ok()?;
+    Some(kb / 1024.0)
+}
+
+/// The performance baseline (docs/gaps.md "No baseline"): how long a deck takes to open, to
+/// render each slide, to save and to export, and the peak memory, as JSON or a table.
+fn bench(args: &[String]) -> Result<(), String> {
+    use deckcraft_engine::cmd::file::{open_presentation, save_bytes};
+    let mut input = None;
+    let mut sample = false;
+    let mut runs = 5usize;
+    let mut as_json = false;
+    let mut it = args.iter();
+    while let Some(a) = it.next() {
+        match a.as_str() {
+            "--sample" => sample = true,
+            "--json" => as_json = true,
+            "--runs" => {
+                runs = it.next().and_then(|v| v.parse().ok()).filter(|n| (1..=1000).contains(n)).ok_or("--runs needs a number from 1 to 1000")?
+            }
+            f if !f.starts_with("--") && input.is_none() => input = Some(f.to_string()),
+            o => return Err(format!("bench: unknown argument `{o}`")),
+        }
+    }
+    if input.is_none() && !sample {
+        return Err("bench needs a FILE or --sample".into());
+    }
+    let mut s = Session::new();
+    let (name, bytes) = match &input {
+        Some(p) => (p.clone(), std::fs::read(p).map_err(|e| format!("{p}: {e}"))?),
+        None => {
+            open(&mut s, None, true)?;
+            let doc = &s.doc().map_err(|e| e.to_string())?.doc;
+            ("sample.deckcraft".to_string(), save_bytes(doc, "deckcraft").map_err(|e| e.to_string())?)
+        }
+    };
+    let e = |x: deckcraft_engine::EngineError| x.to_string();
+    let doc = open_presentation(&name, &bytes).map_err(e)?;
+    let slides = doc.slides.len();
+    let open = time_ms(runs, || open_presentation(&name, &bytes).map(|_| ()).map_err(e))?;
+    let opts = deckcraft_engine::render::RenderOpts { scale: 1.0, ..Default::default() };
+    let mut per_slide = vec![];
+    for i in 0..slides {
+        per_slide.push(time_ms(runs, || {
+            deckcraft_engine::render::render_slide(&doc, i, &opts);
+            Ok(())
+        })?);
+    }
+    let pptx = save_bytes(&doc, "pptx").map_err(e)?;
+    let mut steps = vec![
+        ("open", open),
+        ("save .deckcraft", time_ms(runs, || save_bytes(&doc, "deckcraft").map(|_| ()).map_err(e))?),
+        ("save .pptx", time_ms(runs, || save_bytes(&doc, "pptx").map(|_| ()).map_err(e))?),
+        ("open .pptx", time_ms(runs, || open_presentation("bench.pptx", &pptx).map(|_| ()).map_err(e))?),
+        ("export .pdf", time_ms(runs.min(3), || save_bytes(&doc, "pdf").map(|_| ()).map_err(e))?),
+    ];
+    let render_total: f64 = per_slide.iter().map(|m| m.0).sum();
+    let render_max = per_slide.iter().map(|m| m.1).fold(0.0, f64::max);
+    steps.insert(1, ("render all slides (1×)", (render_total, render_max)));
+    let peak = peak_rss_mib();
+    if as_json {
+        let v = json!({
+            "file": name,
+            "bytes": bytes.len(),
+            "slides": slides,
+            "runs": runs,
+            "steps": steps.iter().map(|(k, (m, x))| json!({"step": k, "medianMs": m, "maxMs": x})).collect::<Vec<_>>(),
+            "renderMsPerSlide": per_slide.iter().map(|m| m.0).collect::<Vec<_>>(),
+            "peakRssMiB": peak,
+        });
+        outln!("{}", serde_json::to_string_pretty(&v).unwrap_or_default());
+    } else {
+        outln!("{name}: {slides} slides, {} KiB, median of {runs} runs", bytes.len() / 1024);
+        for (k, (m, x)) in &steps {
+            outln!("  {k:<24} {m:>9.1} ms   (slowest {x:.1} ms)");
+        }
+        if let Some((i, m)) = per_slide.iter().enumerate().max_by(|a, b| a.1.0.total_cmp(&b.1.0)) {
+            outln!("  slowest slide            {:>9.1} ms   (slide {})", m.0, i + 1);
+        }
+        if let Some(p) = peak {
+            outln!("  peak memory              {p:>9.1} MiB");
+        }
+    }
+    Ok(())
+}
+
 fn info(args: &[String]) -> Result<(), String> {
     let path = args.first().ok_or("info needs a FILE")?;
     let mut s = Session::new();
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..873165dc 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -236,8 +236,10 @@ Detail in [localization-parity.md](localization-parity.md).
 
 ## Performance
 
-- **No baseline.** Nothing measures open time, render time per slide, show frame rate or memory
-  against PowerPoint. 4–8 h for a benchmark suite in `xtask`.
+- **Baseline measured, not compared.** `cargo xtask bench` (and `deckcraft-cli bench FILE`) times
+  open, per-slide render, save, PPTX round trip and PDF export, and peak memory, against a saved
+  baseline; show frame rate isn't measured and there are no PowerPoint numbers to set beside it.
+  2–4 h.
 - **Morph aligns outlines every frame** (#67, PR open). 1 h.
 
 ## Ecosystem
@@ -256,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Benchmark suite (`cargo xtask bench`, `deckcraft-cli bench`): the performance gap is now frame rate and a PowerPoint comparison |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/xtask/src/bench.rs b/xtask/src/bench.rs
new file mode 100644
index 00000000..0ee64bd5
--- /dev/null
+++ b/xtask/src/bench.rs
@@ -0,0 +1,75 @@
+//! `cargo xtask bench`: the performance baseline. Builds `deckcraft-cli` in release, runs its
+//! `bench` on the built-in sample (and any decks given), and compares each step with the saved
+//! baseline (`docs/benchmarks/baseline.json`) when there is one; `--save` writes a new baseline.
+
+use std::path::Path;
+use std::process::Command;
+
+use serde_json::{Value, json};
+
+/// A step this many times slower than the baseline is flagged.
+const SLOWER: f64 = 1.5;
+
+pub fn run(root: &Path, args: &[&str]) -> Result<(), String> {
+    let save = args.contains(&"--save");
+    let decks: Vec<&str> = args.iter().copied().filter(|a| !a.starts_with("--")).collect();
+    let mut build = super::cargo();
+    build.args(["build", "--release", "-q", "-p", "deckcraft-cli"]);
+    super::run(build, "cargo build --release -p deckcraft-cli")?;
+    let target = std::env::var_os("CARGO_TARGET_DIR").map_or_else(|| root.join("target"), Into::into);
+    let cli = target.join("release").join(if cfg!(windows) { "deckcraft-cli.exe" } else { "deckcraft-cli" });
+    let mut results = vec![];
+    let inputs: Vec<Option<&str>> = std::iter::once(None).chain(decks.iter().map(|d| Some(*d))).collect();
+    for input in inputs {
+        let mut c = Command::new(&cli);
+        c.arg("bench").arg("--json");
+        match input {
+            Some(d) => c.arg(d),
+            None => c.arg("--sample"),
+        };
+        let out = c.output().map_err(|e| format!("{}: {e}", cli.display()))?;
+        if !out.status.success() {
+            return Err(format!("bench {}: {}", input.unwrap_or("--sample"), String::from_utf8_lossy(&out.stderr).trim()));
+        }
+        let v: Value = serde_json::from_slice(&out.stdout).map_err(|e| format!("bench output: {e}"))?;
+        results.push(v);
+    }
+    let baseline_path = root.join("docs/benchmarks/baseline.json");
+    let baseline: Option<Value> = std::fs::read(&baseline_path).ok().and_then(|b| serde_json::from_slice(&b).ok());
+    let mut slower = 0;
+    for r in &results {
+        let file = r["file"].as_str().unwrap_or("?");
+        println!("\n{file}: {} slides", r["slides"]);
+        let base = baseline.as_ref().and_then(|b| b["results"].as_array()?.iter().find(|x| x["file"] == r["file"]).cloned());
+        for step in r["steps"].as_array().into_iter().flatten() {
+            let name = step["step"].as_str().unwrap_or("?");
+            let ms = step["medianMs"].as_f64().unwrap_or(0.0);
+            let was = base.as_ref().and_then(|b| b["steps"].as_array()?.iter().find(|s| s["step"] == step["step"])?["medianMs"].as_f64());
+            let cmp = match was {
+                Some(w) if w > 0.5 => {
+                    let k = ms / w;
+                    if k > SLOWER {
+                        slower += 1;
+                    }
+                    format!("  {k:>5.2}× baseline{}", if k > SLOWER { "  SLOWER" } else { "" })
+                }
+                _ => String::new(),
+            };
+            println!("  {name:<24} {ms:>9.1} ms{cmp}");
+        }
+        if let Some(p) = r["peakRssMiB"].as_f64() {
+            println!("  peak memory              {p:>9.1} MiB");
+        }
+    }
+    if save {
+        if let Some(dir) = baseline_path.parent() {
+            std::fs::create_dir_all(dir).map_err(|e| e.to_string())?;
+        }
+        let v = json!({"note": "cargo xtask bench --save; times depend on the machine, compare on the same one", "results": results});
+        std::fs::write(&baseline_path, serde_json::to_vec_pretty(&v).map_err(|e| e.to_string())?).map_err(|e| e.to_string())?;
+        println!("\nwrote {}", baseline_path.display());
+    } else if baseline.is_none() {
+        println!("\nno baseline yet: `cargo xtask bench --save` writes docs/benchmarks/baseline.json");
+    }
+    if slower > 0 { Err(format!("{slower} step(s) more than {SLOWER}× slower than the baseline")) } else { Ok(()) }
+}
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index e64a0d42..fefa20bf 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -4,6 +4,7 @@
 //! invoked through `std::process::Command`.
 
 mod assets;
+mod bench;
 mod ico;
 mod layers;
 mod parity;
@@ -22,6 +23,9 @@ commands:
   wasm            cargo check --target wasm32-unknown-unknown for the wasm-safe crates
   ci              fmt --check, clippy -D warnings, test, assets, layers, wasm (stops at first failure)
   stats [--exact] count tests and lines per crate (--exact: ask the test harness via `-- --list`)
+  bench [--save] [DECK...]
+                  time open, render, save and export of the sample (and DECKs) in release, and
+                  compare with docs/benchmarks/baseline.json (--save writes it)
   parity          recompute the PowerPoint feature-parity summary in docs/parity-checklist.md
   ico <out.ico> <in.png>...
                   pack square PNGs (<= 256 px) into a Windows .ico (see packaging/icons.sh)
@@ -37,6 +41,7 @@ fn main() -> ExitCode {
         Some("ci") => cmd_ci(),
         Some("stats") => stats::run(&root(), rest.contains(&"--exact")),
         Some("parity") => parity::run(&root()),
+        Some("bench") => bench::run(&root(), &rest),
         Some("ico") => ico::run(&rest),
         Some("version") => version::run(&root(), &rest),
         Some("-h" | "--help" | "help") | None => {

From c52b3142c4d0758aa4dd8dfe464167bf27efa644 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:13:14 +0300
Subject: [PATCH 193/376] Make PDF export ~2.8x faster without changing its
 bytes

krilla compressed each slide's print-resolution artwork on the export
thread; with its rayon feature (desktop only) the deflate runs in the
background while the next slide renders. The rendered pixels are also
moved into the image instead of copied.
---
 Cargo.lock            | 1 +
 crates/pdf/Cargo.toml | 5 +++++
 crates/pdf/src/lib.rs | 6 ++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 4044fce6..b313a7e3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2440,6 +2440,7 @@ dependencies = [
  "indexmap",
  "pdf-writer",
  "png",
+ "rayon",
  "rustc-hash 2.1.3",
  "rustybuzz",
  "siphasher",
diff --git a/crates/pdf/Cargo.toml b/crates/pdf/Cargo.toml
index 50f9adbd..24298af0 100644
--- a/crates/pdf/Cargo.toml
+++ b/crates/pdf/Cargo.toml
@@ -18,3 +18,8 @@ kurbo = { workspace = true }
 serde = { workspace = true }
 thiserror = { workspace = true }
 log = { workspace = true }
+
+# Off the web build, krilla compresses each slide's artwork on a background thread while the next
+# slide renders (the same bytes, in parallel).
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+krilla = { workspace = true, features = ["rayon"] }
diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index 97eb641b..a84dd3b9 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -241,7 +241,9 @@ impl Exporter<'_> {
         let scale = (b.width() / 72.0 * self.opts.dpi.clamp(36.0, 600.0)) / sw;
         let img = deckcraft_render::render_slide(pres, i, &RenderOpts { scale, threads: 4, ..Default::default() });
         if img.width > 0 && img.height > 0 {
-            let mut rgba = img.pixels.clone();
+            let (w, h) = (img.width, img.height);
+            // Taken, not copied: a print-resolution slide is ~16 MB.
+            let mut rgba = img.pixels;
             for px in rgba.as_chunks_mut::<4>().0 {
                 // Composite onto white (slides are normally opaque).
                 let a = px[3] as u32;
@@ -250,7 +252,7 @@ impl Exporter<'_> {
                 }
                 px[3] = 255;
             }
-            let image = Image::from_rgba8(rgba, img.width, img.height);
+            let image = Image::from_rgba8(rgba, w, h);
             if let Some(size) = Size::from_wh(b.width() as f32, b.height() as f32) {
                 s.push_transform(&Transform::from_translate(b.x0 as f32, b.y0 as f32));
                 s.draw_image(image, size);

From 8a36a6990e2e800bdedcf5c82220daaf64406c3b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:13:17 +0300
Subject: [PATCH 194/376] View: indent and tab markers on the ruler

While you edit text, the horizontal ruler now shows the text area's
span and the indent and tab markers of the paragraph with the caret.

- First-line indent: the top triangle.
- Hanging indent: the bottom triangle. Dragging it moves the left
  indent while the first line stays put.
- Left indent: the box under the hanging triangle. Dragging it moves
  both.
- Tab stops are drawn as left, centre, right and decimal marks.
- A click on the ruler adds a left tab, dragging a tab moves it, and
  dragging a tab down off the ruler removes it.

Every change goes through a command (format.paragraph or the new
format.tabs). Each is one undo step and applies to the selected
paragraphs, and text editing goes on throughout. format.ruler is a
new query that reports the text area's position and the paragraph's
resolved indents and tabs. Rotated and vertical text show no markers.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/format.rs      |  92 ++++++++++++++++
 crates/engine/src/cmd/ruler_tests.rs |  59 +++++++++++
 crates/ui-egui/src/canvas.rs         | 153 +++++++++++++++++++++++++++
 crates/ui-egui/src/ruler_tests.rs    |  85 +++++++++++++++
 docs/parity-checklist.md             |   8 +-
 5 files changed, 393 insertions(+), 4 deletions(-)
 create mode 100644 crates/engine/src/cmd/ruler_tests.rs
 create mode 100644 crates/ui-egui/src/ruler_tests.rs

diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index c68d1242..8581cb5d 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -139,6 +139,16 @@ pub fn specs() -> Vec<CommandSpec> {
             has_text_or_shapes,
             paragraph
         ),
+        cmd!(query "format.ruler", "Ruler", [], None, "{} → {x, y, width, rotated, marginLeft, indent, tabs: [{pos, align}], defaultTab} for the paragraph with the caret (x, y: the text area's top-left in slide pt)", has_text, ruler),
+        cmd!(
+            "format.tabs",
+            "Tabs…",
+            ["Home", "Paragraph"],
+            None,
+            "{add?: {pos, align?: l|ctr|r|dec}, move?: {from, to}, remove?: pos, clear?: bool, defaultTab?: pt} on the selected paragraphs (pos in pt from the text area's left)",
+            has_text_or_shapes,
+            tabs
+        ),
         cmd!("format.anchor", "Align Text", ["Home", "Paragraph"], None, "{anchor: top|middle|bottom}", has_text_or_shapes, anchor),
         cmd!(
             "format.direction",
@@ -682,3 +692,85 @@ fn state(s: &mut Session, _p: &Value) -> Result<Value> {
         "painter": s.painter.is_some(),
     }))
 }
+
+/// What the horizontal ruler shows while editing text: the paragraph's indents and tab stops,
+/// and where its text area sits on the slide.
+fn ruler(s: &mut Session, _p: &Value) -> Result<Value> {
+    let props = current_para(s);
+    let st = s.doc()?;
+    let t = st.selection.text.clone().ok_or_else(|| bad("format.ruler", "not editing text"))?;
+    let (x, y, w, rotated) = match (t.notes, st.shape(t.shape)) {
+        (false, Some(sh)) => {
+            let ctx = super::text::ctx_for(&st.doc, &st.selection);
+            let x = match &ctx {
+                Some(c) => resolve::xfrm(c, sh),
+                None => sh.xfrm.unwrap_or_default(),
+            };
+            let body = match &ctx {
+                Some(c) => resolve::body(c, sh),
+                None => sh.text.as_ref().map(|b| b.body.clone()).unwrap_or_default(),
+            };
+            let (l, r, tp) = (body.inset_l.unwrap_or(7.2), body.inset_r.unwrap_or(7.2), body.inset_t.unwrap_or(3.6));
+            (x.x + l, x.y + tp, (x.w - l - r).max(0.0), x.rot != 0.0 || body.vert.is_some_and(|v| v != TextDir::Horizontal))
+        }
+        _ => (0.0, 0.0, 0.0, true),
+    };
+    let tabs: Vec<Value> = props.tabs.clone().unwrap_or_default().iter().map(|t| json!({"pos": t.pos, "align": t.align})).collect();
+    Ok(json!({
+        "x": x, "y": y, "width": w, "rotated": rotated,
+        "marginLeft": props.margin_left.unwrap_or(0.0),
+        "indent": props.indent.unwrap_or(0.0),
+        "tabs": tabs,
+        "defaultTab": props.default_tab.unwrap_or(72.0),
+    }))
+}
+
+const MAX_TABS: usize = 32;
+
+fn tabs(s: &mut Session, p: &Value) -> Result<Value> {
+    let fin = |v: Option<f64>| v.filter(|x| x.is_finite()).map(|x| x.clamp(0.0, 4000.0));
+    let align_of = |v: &Value| match v.get("align").and_then(Value::as_str).unwrap_or("l") {
+        "ctr" | "center" => "ctr",
+        "r" | "right" => "r",
+        "dec" | "decimal" => "dec",
+        _ => "l",
+    };
+    let add = p.get("add").and_then(|a| fin(a.get("pos").and_then(Value::as_f64)).map(|pos| (pos, align_of(a).to_string())));
+    let mv = p.get("move").and_then(|m| Some((fin(m.get("from").and_then(Value::as_f64))?, fin(m.get("to").and_then(Value::as_f64))?)));
+    let remove = fin(p.get("remove").and_then(Value::as_f64));
+    let clear = bool_or(p, "clear", false);
+    let default_tab = fin(p.get("defaultTab").and_then(Value::as_f64)).filter(|v| *v >= 1.0);
+    if add.is_none() && mv.is_none() && remove.is_none() && !clear && default_tab.is_none() {
+        return Err(bad("format.tabs", "nothing to change"));
+    }
+    // The stops as the caret's paragraph shows them (inherited ones included), so editing a
+    // placeholder's tab that came from its layout works like editing one set on the paragraph.
+    let base = current_para(s).tabs.unwrap_or_default();
+    let near = |a: f64, b: f64| (a - b).abs() < 0.5;
+    let mut stops = if clear { vec![] } else { base };
+    if let Some(at) = remove {
+        stops.retain(|t| !near(t.pos, at));
+    }
+    if let Some((from, to)) = mv
+        && let Some(t) = stops.iter_mut().find(|t| near(t.pos, from))
+    {
+        t.pos = to;
+    }
+    if let Some((pos, align)) = add {
+        stops.retain(|t| !near(t.pos, pos));
+        stops.push(deckcraft_model::text::TabStop { pos, align });
+    }
+    stops.sort_by(|a, b| a.pos.total_cmp(&b.pos));
+    stops.dedup_by(|a, b| near(a.pos, b.pos));
+    stops.truncate(MAX_TABS);
+    format_para(s, &move |para| {
+        para.props.tabs = Some(stops.clone());
+        if let Some(d) = default_tab {
+            para.props.default_tab = Some(d);
+        }
+    })
+}
+
+#[cfg(test)]
+#[path = "ruler_tests.rs"]
+mod ruler_tests;
diff --git a/crates/engine/src/cmd/ruler_tests.rs b/crates/engine/src/cmd/ruler_tests.rs
new file mode 100644
index 00000000..1d23154e
--- /dev/null
+++ b/crates/engine/src/cmd/ruler_tests.rs
@@ -0,0 +1,59 @@
+//! The ruler's data and tab-stop editing.
+
+use serde_json::json;
+
+use crate::Session;
+
+fn editing() -> (Session, u64) {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let id = s.execute("insert.textBox", &json!({"rect": [100, 50, 400, 40]})).unwrap()["id"].as_u64().unwrap();
+    s.execute("text.edit", &json!({"id": id})).unwrap();
+    s.execute("text.insert", &json!({"text": "a\tb"})).unwrap();
+    (s, id)
+}
+
+#[test]
+fn ruler_reports_the_text_area_and_indents() {
+    let (mut s, _) = editing();
+    let r = s.execute("format.ruler", &json!({})).unwrap();
+    assert!((r["x"].as_f64().unwrap() - 107.2).abs() < 0.01, "{r}");
+    assert_eq!(r["rotated"], false);
+    assert_eq!(r["tabs"].as_array().unwrap().len(), 0);
+    s.execute("format.paragraph", &json!({"indentLeft": 36, "indentFirst": -18})).unwrap();
+    let r = s.execute("format.ruler", &json!({})).unwrap();
+    assert_eq!((r["marginLeft"].as_f64(), r["indent"].as_f64()), (Some(36.0), Some(-18.0)));
+    s.execute("text.exit", &json!({})).unwrap();
+    assert!(s.execute("format.ruler", &json!({})).is_err(), "only while editing text");
+}
+
+#[test]
+fn tabs_add_move_remove_clear_and_undo() {
+    let (mut s, _) = editing();
+    let tabs = |s: &mut Session| -> Vec<(f64, String)> {
+        s.execute("format.ruler", &json!({})).unwrap()["tabs"]
+            .as_array()
+            .unwrap()
+            .iter()
+            .map(|t| (t["pos"].as_f64().unwrap(), t["align"].as_str().unwrap().to_string()))
+            .collect()
+    };
+    s.execute("format.tabs", &json!({"add": {"pos": 144, "align": "center"}})).unwrap();
+    s.execute("format.tabs", &json!({"add": {"pos": 72}})).unwrap();
+    assert_eq!(tabs(&mut s), vec![(72.0, "l".into()), (144.0, "ctr".into())], "sorted");
+    s.execute("format.tabs", &json!({"add": {"pos": 72.2, "align": "r"}})).unwrap();
+    assert_eq!(tabs(&mut s), vec![(72.2, "r".into()), (144.0, "ctr".into())], "a stop at the same place is replaced");
+    s.execute("format.tabs", &json!({"move": {"from": 144, "to": 200}})).unwrap();
+    s.execute("format.tabs", &json!({"remove": 72.2})).unwrap();
+    assert_eq!(tabs(&mut s), vec![(200.0, "ctr".into())]);
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(tabs(&mut s).len(), 2);
+    s.execute("format.tabs", &json!({"clear": true})).unwrap();
+    assert!(tabs(&mut s).is_empty());
+    assert!(s.execute("format.tabs", &json!({})).is_err());
+    assert!(s.execute("format.tabs", &json!({"add": {"pos": f64::MAX}})).is_ok(), "clamped, not a crash");
+    for i in 0..100 {
+        s.execute("format.tabs", &json!({"add": {"pos": i as f64 * 3.0}})).unwrap();
+    }
+    assert!(tabs(&mut s).len() <= 32);
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..073f9f41 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -161,6 +161,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     }
     if app.ui.ruler {
         ruler(&painter, avail, slide_rect, scale, &t);
+        ruler_markers(app, ui, &painter, avail, xf, &t);
     }
     pointer(app, ui, &resp, xf);
     overlays(app, ui, &painter, xf, &t);
@@ -366,6 +367,154 @@ fn ruler(p: &egui::Painter, avail: Rect, slide: Rect, scale: f32, t: &Tokens) {
     }
 }
 
+/// What is being dragged on the ruler.
+#[derive(Clone, Copy, Debug, PartialEq)]
+enum RulerDrag {
+    /// First-line indent (the top triangle).
+    First,
+    /// Hanging indent (the bottom triangle): moves the left indent, the first line stays put.
+    Hanging,
+    /// Left indent (the box under the hanging triangle): moves both together.
+    Left,
+    /// The tab stop that was at this position (pt from the text area's left).
+    Tab(f64),
+}
+
+/// The paragraph's indents and tab stops on the horizontal ruler while text is being edited,
+/// draggable as in PowerPoint; a click on the ruler adds a left tab, dragging a tab off the
+/// ruler removes it.
+fn ruler_markers(app: &mut SlideApp, ui: &mut Ui, p: &egui::Painter, avail: Rect, xf: Xf, t: &Tokens) {
+    if app.session.active().is_none_or(|d| d.selection.text.is_none()) {
+        return;
+    }
+    let Ok(info) = app.session.execute("format.ruler", &json!({})) else { return };
+    if info["rotated"].as_bool().unwrap_or(true) {
+        return;
+    }
+    let f = |k: &str| info[k].as_f64().filter(|v| v.is_finite()).unwrap_or(0.0);
+    let (x0, width, ml, ind) = (f("x"), f("width"), f("marginLeft"), f("indent"));
+    let tabs: Vec<(f64, String)> = info["tabs"]
+        .as_array()
+        .map(|a| a.iter().filter_map(|t| Some((t["pos"].as_f64()?, t["align"].as_str().unwrap_or("l").to_string()))).collect())
+        .unwrap_or_default();
+    let top = Rect::from_min_max(pos2(avail.min.x + 16.0, avail.min.y), pos2(avail.max.x, avail.min.y + 16.0));
+    let sx = |q: f64| xf.to_screen(Point::new(x0 + q, 0.0)).x;
+    let to_q = |x: f32| ((xf.to_slide(pos2(x, 0.0)).x - x0).clamp(0.0, width.max(0.0)) * 2.0).round() / 2.0;
+    // The text area's span, outlined on the ruler.
+    let area = Rect::from_min_max(pos2(sx(0.0), top.min.y + 2.0), pos2(sx(width), top.max.y - 1.0)).intersect(top);
+    p.rect_stroke(area, CornerRadius::ZERO, Stroke::new(1.0, t.text_faint.gamma_multiply(0.5)), egui::StrokeKind::Inside);
+
+    let resp = ui.interact(top, ui.id().with("ruler_markers"), Sense::click_and_drag());
+    let id = ui.id().with("ruler_drag");
+    let mut drag: Option<RulerDrag> = ui.data(|d| d.get_temp::<RulerDrag>(id));
+    let pointer = resp.interact_pointer_pos().or(resp.hover_pos());
+    if resp.drag_started()
+        && let Some(at) = ui.input(|i| i.pointer.press_origin()).or(resp.interact_pointer_pos())
+    {
+        let near = |q: f64| (sx(q) - at.x).abs() <= 5.0;
+        let y = at.y - top.min.y;
+        drag = if let Some((pos, _)) = tabs.iter().find(|(pos, _)| near(*pos) && y >= 8.0) {
+            Some(RulerDrag::Tab(*pos))
+        } else if y < 6.0 && near(ml + ind) {
+            Some(RulerDrag::First)
+        } else if (6.0..11.0).contains(&y) && near(ml) {
+            Some(RulerDrag::Hanging)
+        } else if y >= 11.0 && near(ml) {
+            Some(RulerDrag::Left)
+        } else {
+            None
+        };
+        ui.data_mut(|d| match drag {
+            Some(v) => {
+                d.insert_temp(id, v);
+            }
+            None => {
+                d.remove::<RulerDrag>(id);
+            }
+        });
+    }
+    // Where each marker is drawn: the dragged one follows the pointer.
+    let live = drag.zip(pointer.filter(|_| resp.dragged())).map(|(d, at)| (d, to_q(at.x), at.y > top.max.y + 20.0));
+    let (mut first, mut left) = (ml + ind, ml);
+    match live {
+        Some((RulerDrag::First, q, _)) => first = q,
+        Some((RulerDrag::Hanging, q, _)) => left = q,
+        Some((RulerDrag::Left, q, _)) => {
+            first = q + ind;
+            left = q;
+        }
+        _ => {}
+    }
+    let col = t.text_dim;
+    let tri = |x: f32, y0: f32, down: bool| {
+        let (a, b) = if down { (y0, y0 + 5.0) } else { (y0 + 5.0, y0) };
+        p.add(egui::Shape::convex_polygon(vec![pos2(x - 4.0, a), pos2(x + 4.0, a), pos2(x, b)], t.card, Stroke::new(1.0, col)));
+    };
+    tri(sx(first), top.min.y + 1.0, true);
+    tri(sx(left), top.min.y + 6.0, false);
+    p.rect(
+        Rect::from_min_max(pos2(sx(left) - 4.0, top.min.y + 11.5), pos2(sx(left) + 4.0, top.max.y - 0.5)),
+        CornerRadius::ZERO,
+        t.card,
+        Stroke::new(1.0, col),
+        egui::StrokeKind::Inside,
+    );
+    for (pos, align) in &tabs {
+        let (q, gone) = match live {
+            Some((RulerDrag::Tab(from), q, off)) if (from - pos).abs() < 0.5 => (q, off),
+            _ => (*pos, false),
+        };
+        if gone {
+            continue;
+        }
+        let (x, y) = (sx(q), top.max.y - 2.0);
+        let st = Stroke::new(1.5, t.text);
+        p.line_segment([pos2(x, y - 6.0), pos2(x, y)], st);
+        match align.as_str() {
+            "r" => {
+                p.line_segment([pos2(x - 5.0, y), pos2(x, y)], st);
+            }
+            "ctr" => {
+                p.line_segment([pos2(x - 4.0, y), pos2(x + 4.0, y)], st);
+            }
+            "dec" => {
+                p.line_segment([pos2(x - 4.0, y), pos2(x + 4.0, y)], st);
+                p.circle_filled(pos2(x + 3.0, y - 4.0), 1.0, t.text);
+            }
+            _ => {
+                p.line_segment([pos2(x, y), pos2(x + 5.0, y)], st);
+            }
+        }
+    }
+    if drag.is_some() {
+        ui.ctx().set_cursor_icon(egui::CursorIcon::ResizeHorizontal);
+    }
+
+    // Commit on release; a click on bare ruler adds a left tab.
+    if resp.drag_stopped() {
+        if let (Some(d), Some(at)) = (drag, pointer) {
+            let q = to_q(at.x);
+            let r = match d {
+                RulerDrag::First => app.run("format.paragraph", json!({"indentFirst": q - ml})),
+                RulerDrag::Hanging => app.run("format.paragraph", json!({"indentLeft": q, "indentFirst": ml + ind - q})),
+                RulerDrag::Left => app.run("format.paragraph", json!({"indentLeft": q})),
+                RulerDrag::Tab(from) if at.y > top.max.y + 20.0 => app.run("format.tabs", json!({"remove": from})),
+                RulerDrag::Tab(from) => app.run("format.tabs", json!({"move": {"from": from, "to": q}})),
+            };
+            if let Err(e) = r {
+                app.set_status(e);
+            }
+        }
+        ui.data_mut(|d| d.remove::<RulerDrag>(id));
+    } else if resp.clicked()
+        && let Some(at) = resp.interact_pointer_pos()
+        && at.x >= area.min.x
+        && at.x <= area.max.x
+    {
+        let _ = app.run("format.tabs", json!({"add": {"pos": to_q(at.x), "align": "l"}}));
+    }
+}
+
 fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
     let tol = (4.0 / xf.scale) as f64;
     let m = mods(ui);
@@ -697,3 +846,7 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
         }
     });
 }
+
+#[cfg(test)]
+#[path = "ruler_tests.rs"]
+mod ruler_tests;
diff --git a/crates/ui-egui/src/ruler_tests.rs b/crates/ui-egui/src/ruler_tests.rs
new file mode 100644
index 00000000..fd12d206
--- /dev/null
+++ b/crates/ui-egui/src/ruler_tests.rs
@@ -0,0 +1,85 @@
+//! The ruler's indent and tab markers driven with the mouse while editing text.
+
+use deckcraft_engine::Session;
+use egui::{Modifiers, PointerButton, Pos2};
+use egui_kittest::Harness;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn drag(h: &mut Harness<'_, SlideApp>, a: Pos2, b: Pos2) {
+    h.hover_at(a);
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: a, button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    h.run_steps(1);
+    for i in 1..=8 {
+        h.event(egui::Event::PointerMoved(a + (b - a) * (i as f32 / 8.0)));
+        h.run_steps(1);
+    }
+    h.event(egui::Event::PointerButton { pos: b, button: PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(2);
+}
+
+fn click(h: &mut Harness<'_, SlideApp>, at: Pos2) {
+    h.hover_at(at);
+    h.run_steps(1);
+    h.event(egui::Event::PointerButton { pos: at, button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    h.event(egui::Event::PointerButton { pos: at, button: PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.run_steps(2);
+}
+
+fn ruler(h: &mut Harness<'_, SlideApp>) -> serde_json::Value {
+    h.state_mut().session.execute("format.ruler", &json!({})).unwrap()
+}
+
+#[test]
+fn drag_indents_add_move_and_remove_tabs_on_the_ruler() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let id = s.execute("insert.textBox", &json!({"rect": [100, 150, 500, 40]})).unwrap()["id"].as_u64().unwrap();
+    s.execute("text.edit", &json!({"id": id})).unwrap();
+    s.execute("text.insert", &json!({"text": "Name\tRole\tTeam"})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.ruler = true;
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    let (slide, k) = (h.state().slide_rect.unwrap(), h.state().canvas_scale);
+    let x0 = ruler(&mut h)["x"].as_f64().unwrap() as f32;
+    // The horizontal ruler runs along the top of the canvas.
+    let top = h.state().canvas_rect.unwrap().min.y;
+    let rx = |q: f32| slide.min.x + (x0 + q) * k;
+
+    // First-line indent triangle (top) to 36 pt.
+    drag(&mut h, Pos2::new(rx(0.0), top + 3.0), Pos2::new(rx(36.0), top + 3.0));
+    let r = ruler(&mut h);
+    assert!((r["indent"].as_f64().unwrap() - 36.0).abs() <= 1.0, "{r}");
+    assert_eq!(r["marginLeft"].as_f64(), Some(0.0));
+
+    // Hanging triangle (middle) to 18 pt: the first line stays at 36.
+    drag(&mut h, Pos2::new(rx(0.0), top + 8.0), Pos2::new(rx(18.0), top + 8.0));
+    let r = ruler(&mut h);
+    let (ml, ind) = (r["marginLeft"].as_f64().unwrap(), r["indent"].as_f64().unwrap());
+    assert!((ml - 18.0).abs() <= 1.0 && (ml + ind - 36.0).abs() <= 1.0, "{r}");
+
+    // Click on the ruler: a left tab; drag it along; drag it off to remove it.
+    click(&mut h, Pos2::new(rx(150.0), top + 12.0));
+    let r = ruler(&mut h);
+    assert_eq!(r["tabs"].as_array().unwrap().len(), 1, "{r}");
+    let pos = r["tabs"][0]["pos"].as_f64().unwrap() as f32;
+    assert!((pos - 150.0).abs() <= 1.0);
+    drag(&mut h, Pos2::new(rx(pos), top + 12.0), Pos2::new(rx(220.0), top + 12.0));
+    let pos = ruler(&mut h)["tabs"][0]["pos"].as_f64().unwrap() as f32;
+    assert!((pos - 220.0).abs() <= 1.0, "{pos}");
+    if let Ok(img) = h.render() {
+        let _ = img.save("/tmp/ruler.png");
+    }
+    assert!(h.state().session.active().unwrap().selection.text.is_some(), "still editing the text");
+    drag(&mut h, Pos2::new(rx(pos), top + 12.0), Pos2::new(rx(pos), top + 80.0));
+    assert!(ruler(&mut h)["tabs"].as_array().unwrap().is_empty());
+}
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..a76ca062 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -3,12 +3,12 @@
 > **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 79%** over 191 features.
+**Weighted breadth parity: 80%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
+| P1 | 65 | 39 | 20 | 6 | 75% |
 | P2 | 54 | 13 | 15 | 26 | 38% |
 
 | Area | Parity |
@@ -16,7 +16,7 @@ The summary between `<!-- SUMMARY -->
 | Application shell | 77% |
 | Files | 71% |
 | Slides | 90% |
-| Views | 90% |
+| Views | 95% |
 | Masters & themes | 85% |
 | Shapes | 88% |
 | Format | 83% |
@@ -86,7 +86,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Views | Notes Page | P1 | D |
 | Views | Reading View | P1 | D |
 | Views | Zoom, fit to window | P0 | D |
-| Views | Rulers, gridlines, guides | P1 | P |
+| Views | Rulers, gridlines, guides | P1 | D |
 | Views | Smart guides | P1 | D |
 | Views | Grayscale / black and white view | P2 | D |
 | Views | New window / arrange windows | P2 | M |

From b89c9cafd7c4fc2c1082910a8c593653a38b8cb0 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:21:42 +0300
Subject: [PATCH 195/376] UI: preview slide animations on the editor canvas
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Animations › Preview and Animation Pane › Play All play the current
slide on the canvas instead of opening the slide show. Escape or a
click stops playback. Transitions › Preview still opens the show.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 README.md                      |   2 +-
 ROADMAP.md                     |  10 +-
 crates/ui-egui/src/canvas.rs   |  26 ++--
 crates/ui-egui/src/control.rs  |   5 +
 crates/ui-egui/src/lib.rs      | 222 +++++++++++++++++++++++++++++++++
 crates/ui-egui/src/panes.rs    |  10 +-
 crates/ui-egui/src/preview.rs  |  38 ++++++
 crates/ui-egui/src/ribbon.rs   |  11 +-
 crates/ui-egui/src/show.rs     |  21 +---
 crates/ui-egui/src/textures.rs |  25 +++-
 docs/animation-parity.md       |   8 +-
 docs/architecture.md           |   4 +-
 docs/control-protocol.md       |   4 +-
 docs/gaps.md                   |  10 +-
 docs/parity-checklist.md       |  10 +-
 docs/roadmap.md                |   5 +-
 docs/target-app-parity.md      |  11 +-
 docs/ui-parity.md              |   5 +-
 18 files changed, 356 insertions(+), 71 deletions(-)
 create mode 100644 crates/ui-egui/src/preview.rs

diff --git a/README.md b/README.md
index f25aef2d..a3e96a89 100644
--- a/README.md
+++ b/README.md
@@ -154,7 +154,7 @@ deckcraft-cli mcp --connect 7990        # drive the running app (deckcraft --con
 
 ## Roadmap
 
-DeckCraft is in **alpha**. It covers **79% of PowerPoint's features by breadth** (92% of the core
+DeckCraft is in **alpha**. It covers **80% of PowerPoint's features by breadth** (92% of the core
 ones, measured) and is about **55% of the way to replacing PowerPoint for real work** (estimated).
 See [ROADMAP.md](ROADMAP.md) for the stage, numbers by dimension and what's next,
 [docs/target-app-parity.md](docs/target-app-parity.md) for the full assessment,
diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..a2bc98c2 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (animation preview on the canvas; breadth 79% → 80%, Animations 79% → 85%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -14,7 +14,7 @@ format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and av
 
 | | Value | Kind |
 |---|---|---|
-| **Feature breadth** | **79%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 36%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
+| **Feature breadth** | **80%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 36%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
 | Menu-bar coverage | 59% of 217 app-specific PowerPoint menu items matched by name (lower bound) | measured: script over the PowerPoint menu dump and the 226 commands |
 | **Ready for real work** | **~55%** | estimated: weighted dimensions below |
 | Mainstream practitioner | ~53% | estimated: weekly-use areas × discounts for interaction (×0.92), stability (×0.92) and `.pptx` exchange (×0.88), [method](docs/target-app-parity.md#mainstream-practitioner-and-essentials-user) |
@@ -45,7 +45,7 @@ EMF/SVG pictures, the data-loss and startup-crash bugs (#60, #40, #59) and the b
 
 | Dimension | Ready | Hours to full | Doc |
 |---|---:|---|---|
-| Features (breadth 79% measured, with depth) | ~62% | 140–240 | [docs/parity-checklist.md](docs/parity-checklist.md) |
+| Features (breadth 80% measured, with depth) | ~62% | 140–240 | [docs/parity-checklist.md](docs/parity-checklist.md) |
 | UI/UX fidelity | ~60% | 30–50 | [docs/ui-parity.md](docs/ui-parity.md) |
 | File formats (PPTX, PDF, legacy, export) | ~58% | 60–110 | [docs/file-format-parity.md](docs/file-format-parity.md) |
 | Hardware (GPU raster, video decode, displays, pens) | ~40% | 25–45 | [docs/hardware-parity.md](docs/hardware-parity.md) |
@@ -75,7 +75,7 @@ EMF/SVG pictures, the data-loss and startup-crash bugs (#60, #40, #59) and the b
 | Pictures | 48% | ~45% | 12–20 | [file formats](docs/file-format-parity.md) |
 | Media | 67% | ~60% | 8–14 | [file formats](docs/file-format-parity.md) |
 | Transitions | 92% | ~80% | 4–8 | [animation-parity](docs/animation-parity.md) |
-| Animations | 79% | ~65% | 10–16 | [animation-parity](docs/animation-parity.md) |
+| Animations | 85% | ~65% | 10–16 | [animation-parity](docs/animation-parity.md) |
 | Slide show and presenter view | 66% | ~60% | 10–16 | [slideshow-parity](docs/slideshow-parity.md) |
 | Review | 60% | ~45% | 8–14 | [gaps](docs/gaps.md) |
 | Draw (ink) | 33% | ~30% | 5–9 | [hardware-parity](docs/hardware-parity.md) |
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Animations ▸ Preview plays the current slide's animations on the editor canvas (Play All does the same); Escape or a click stops it. Breadth 79% → 80%, Animations 79% → 85% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: animation preview on the editor canvas; breadth 80%, Animations 85% |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..f5e30035 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -80,7 +80,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
             let _ = pinch_pos;
         } else if overflow != egui::Vec2::ZERO {
             offset -= wheel;
-        } else if wheel.y.abs() > 18.0 && app.session.tool.marquee.is_none() && !app.session.tool.dragging() {
+        } else if wheel.y.abs() > 18.0 && !app.anim_preview_active() && app.session.tool.marquee.is_none() && !app.session.tool.dragging() {
             // Wheel over a fitted slide pages through slides (like PowerPoint).
             let id = if wheel.y < 0.0 { "slide.next" } else { "slide.previous" };
             let gate = ui.id().with("wheel_gate");
@@ -111,6 +111,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     };
     crate::media::gif_repaint(ui.ctx(), &gifs);
     let times: Vec<_> = gifs.iter().map(|g| (g.id, g.t)).collect();
+    let anim = app.anim_preview_draw();
     let st = app.session.active();
     // One texture pixel in screen points, and the canvas in pixels from the slide's corner.
     let pixel = vec2(slide_rect.width() / px.0 as f32, slide_rect.height() / px.1 as f32);
@@ -119,7 +120,8 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
         Some((Target::Slides, d)) => {
             let idx = d.selection.slide;
             let doc = d.doc.clone();
-            app.textures.slide(ui.ctx(), &doc, idx, px, visible, true, crate::media::gif_key(&gifs), app.ui.grayscale, &times)
+            let frame = anim.as_ref().map(|(tl, t)| (tl, *t));
+            app.textures.slide(ui.ctx(), &doc, idx, px, visible, true, crate::media::gif_key(&gifs), app.ui.grayscale, &times, frame)
         }
         Some((Target::Master { master }, d)) => master_tex(ui.ctx(), &d.doc, master, None, px, visible),
         Some((Target::Layout { master, layout }, d)) => master_tex(ui.ctx(), &d.doc, master, Some(layout), px, visible),
@@ -163,11 +165,13 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
         ruler(&painter, avail, slide_rect, scale, &t);
     }
     pointer(app, ui, &resp, xf);
-    overlays(app, ui, &painter, xf, &t);
-    ime_output(app, ui, xf);
-    media_bar(app, ui, xf);
-    gif_buttons(app, ui, xf, &gifs);
-    context_menu(app, &resp);
+    if !app.anim_preview_active() {
+        overlays(app, ui, &painter, xf, &t);
+        ime_output(app, ui, xf);
+        media_bar(app, ui, xf);
+        gif_buttons(app, ui, xf, &gifs);
+        context_menu(app, &resp);
+    }
 }
 
 /// The canvas `avail` in texture pixels (`pixel`: one pixel's size in points) from the slide's
@@ -367,6 +371,14 @@ fn ruler(p: &egui::Painter, avail: Rect, slide: Rect, scale: f32, t: &Tokens) {
 }
 
 fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
+    if app.anim_preview_active() {
+        // A click on the slide ends the preview, then selects as usual.
+        if resp.hovered() && ui.input(|i| i.pointer.primary_pressed()) {
+            app.stop_anim_preview();
+        } else {
+            return;
+        }
+    }
     let tol = (4.0 / xf.scale) as f64;
     let m = mods(ui);
     let Some(pos) = resp.interact_pointer_pos().or(resp.hover_pos()) else { return };
diff --git a/crates/ui-egui/src/control.rs b/crates/ui-egui/src/control.rs
index d344d912..a554f025 100644
--- a/crates/ui-egui/src/control.rs
+++ b/crates/ui-egui/src/control.rs
@@ -76,6 +76,7 @@ pub fn inspect(app: &SlideApp, ctx: &egui::Context) -> Value {
         "home": app.backstage_open(),
         "backstage": app.backstage.as_ref().map(|b| b.page.id()),
         "showing": app.show.as_ref().map(|s| json!({"slide": s.state.slide, "step": s.state.step, "ended": s.ended})),
+        "animPreview": app.anim_preview_report().map(|(slide, time, duration)| json!({"slide": slide, "time": time, "duration": duration})),
         "documents": app.session.documents().iter().map(|d| json!({"title": d.title(), "dirty": d.is_dirty(), "path": d.path})).collect::<Vec<_>>(),
         "status": app.status.as_ref().map(|s| s.0.clone()),
         "perf": {"frameMs": app.perf.frame_ms, "renderMs": app.perf.render_ms, "fps": app.perf.fps},
@@ -134,6 +135,10 @@ pub fn handle(app: &mut SlideApp, ctx: &egui::Context, req: &ControlRequest) ->
         }
         "ui.key" => {
             let Some(k) = s("key") else { return err("missing `key`") };
+            if app.anim_preview_active() && app.show.is_none() && matches!(k.to_ascii_lowercase().as_str(), "escape" | "esc") {
+                app.stop_anim_preview();
+                return ok(json!({"preview": false}));
+            }
             if let Some(show) = app.show.as_ref()
                 && !show.ended
                 && let Some(key) = key_from(k)
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..ec7985aa 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -16,6 +16,7 @@ pub mod icons;
 pub mod media;
 pub mod menus;
 pub mod panes;
+mod preview;
 pub mod ribbon;
 pub mod selpane;
 pub mod show;
@@ -154,6 +155,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("show.start", "Slide Show", Some("F5"), "{from?: index}"),
     ("show.presenter", "Presenter View", None, "{on?: bool}"),
     ("show.end", "End Show", None, "{}"),
+    ("animation.preview", "Preview Animations", None, "{on?: bool}"),
     ("app.home", "Home", None, "{on?}"),
     ("app.backstage", "File", Some("Alt+F"), "{page?: home|new|open|info|saveAs|print|export|account, on?: bool}"),
     ("app.closePresentation", "Close", Some("Cmd+W"), "{}"),
@@ -177,6 +179,18 @@ pub struct Perf {
     pub fps: f64,
 }
 
+/// Playhead for the in-canvas animation preview.
+struct AnimPreview {
+    uid: u64,
+    slide: usize,
+    /// `Arc` address of the slide when preview started. An edit replaces the slide and stops playback.
+    slide_ptr: usize,
+    /// egui time when the first frame latched the clock (`None` until then).
+    started: Option<f64>,
+    elapsed: f64,
+    timeline: deckcraft_anim::Timeline,
+}
+
 pub struct SlideApp {
     pub session: Session,
     pub services: Services,
@@ -185,6 +199,8 @@ pub struct SlideApp {
     pub control_rx: Option<Receiver<ControlRequest>>,
     pub dialog: Option<dialogs::Dialog>,
     pub show: Option<show::Show>,
+    /// Current slide's animations playing on the editor canvas (not the full-screen show).
+    anim_preview: Option<AnimPreview>,
     /// Audio/video playback (editor control bar, slide show, `media.*` commands).
     pub media: media::MediaHost,
     pub status: Option<(String, f64)>,
@@ -240,6 +256,7 @@ impl SlideApp {
             control_rx: None,
             dialog: None,
             show: None,
+            anim_preview: None,
             media: media::MediaHost::new(audio_out),
             status: None,
             toast: None,
@@ -502,6 +519,13 @@ impl SlideApp {
                 self.show = None;
                 self.media.stop_owned(media::Owner::Show);
             }
+            "animation.preview" => {
+                if p.get("on").and_then(Value::as_bool) == Some(false) {
+                    self.anim_preview = None;
+                    return Ok(json!({"playing": false}));
+                }
+                return self.start_anim_preview();
+            }
             "app.home" => {
                 let on = self.flag(p, self.backstage_open());
                 if on {
@@ -555,12 +579,91 @@ impl SlideApp {
     }
 
     pub fn start_show(&mut self, from: usize, reading: bool) {
+        self.anim_preview = None;
         self.media.stop_owned(media::Owner::Editor);
         if let Some(d) = self.session.active() {
             self.show = Some(show::Show::new(&d.doc, from, reading, self.ui.presenter_view && !reading));
         }
     }
 
+    /// The current slide's animations are playing on the editor canvas.
+    pub fn anim_preview_active(&self) -> bool {
+        self.anim_preview.is_some()
+    }
+
+    /// `(slide, seconds played, sequence length)` while a preview is running.
+    pub fn anim_preview_report(&self) -> Option<(usize, f64, f64)> {
+        self.anim_preview.as_ref().map(|p| (p.slide, p.elapsed, p.timeline.total_duration()))
+    }
+
+    pub fn stop_anim_preview(&mut self) {
+        self.anim_preview = None;
+    }
+
+    /// Timeline and playhead for this frame's canvas raster. `None` when the editor should draw the slide at rest.
+    pub fn anim_preview_draw(&self) -> Option<(deckcraft_anim::Timeline, f64)> {
+        self.anim_preview.as_ref().map(|p| (p.timeline.clone(), p.elapsed))
+    }
+
+    /// Advance the preview clock. Stops when the slide changes, the slide is edited, or the sequence
+    /// (plus a short hold) has finished.
+    pub fn tick_anim_preview(&mut self, now: f64) -> bool {
+        let Some(p) = self.anim_preview.as_ref() else { return false };
+        let (uid, slide, ptr) = (p.uid, p.slide, p.slide_ptr);
+        let alive = self.show.is_none()
+            && self.session.active().is_some_and(|d| {
+                d.uid == uid
+                    && d.selection.target == deckcraft_engine::Target::Slides
+                    && d.selection.slide == slide
+                    && d.doc.slides.get(slide).is_some_and(|s| std::sync::Arc::as_ptr(s) as usize == ptr)
+            });
+        if !alive {
+            self.anim_preview = None;
+            return false;
+        }
+        let Some(p) = self.anim_preview.as_mut() else { return false };
+        let now = if now.is_finite() { now } else { p.started.unwrap_or(0.0) };
+        let start = *p.started.get_or_insert(now);
+        let elapsed = (now - start).max(0.0);
+        if !elapsed.is_finite() || elapsed > p.timeline.total_duration() + preview::HOLD_SECS {
+            self.anim_preview = None;
+            return false;
+        }
+        p.elapsed = elapsed;
+        true
+    }
+
+    fn start_anim_preview(&mut self) -> Result<Value, String> {
+        let (uid, slide, ptr, timeline) = {
+            let Some(d) = self.session.active() else {
+                return Err("no presentation is open".into());
+            };
+            if d.selection.target != deckcraft_engine::Target::Slides {
+                return Err("animation preview plays the current slide".into());
+            }
+            let slide = d.selection.slide;
+            let Some(slide_arc) = d.doc.slides.get(slide) else {
+                return Err("no slide to preview".into());
+            };
+            let ptr = std::sync::Arc::as_ptr(slide_arc) as usize;
+            let timeline = deckcraft_anim::ShowState::timeline(&d.doc, slide);
+            (d.uid, slide, ptr, timeline)
+        };
+        if timeline.is_empty() {
+            self.anim_preview = None;
+            self.set_status("This slide has no animations");
+            return Ok(json!({"playing": false}));
+        }
+        if matches!(self.ui.view, ViewMode::Sorter | ViewMode::NotesPage) {
+            self.ui.view = ViewMode::Normal;
+        }
+        self.close_backstage();
+        let duration = timeline.total_duration();
+        self.anim_preview = Some(AnimPreview { uid, slide, slide_ptr: ptr, started: None, elapsed: 0.0, timeline });
+        self.set_status("Previewing animations");
+        Ok(json!({"playing": true, "slide": slide, "duration": duration}))
+    }
+
     fn pick_and_open(&mut self) {
         if let Some(pick) = self.services.pick_open.as_mut() {
             if let Some(path) = pick("open") {
@@ -909,6 +1012,10 @@ impl SlideApp {
                     }
                 }
                 egui::Event::Key { key, pressed: true, modifiers, .. } => {
+                    if key == egui::Key::Escape && self.anim_preview.is_some() && !modifiers.command && !modifiers.ctrl && !modifiers.alt {
+                        self.anim_preview = None;
+                        continue;
+                    }
                     let mods = Mods { shift: modifiers.shift, alt: modifiers.alt, cmd: modifiers.command || modifiers.ctrl };
                     if !self.session.tool.drawing_freeform() && menus::ui_shortcut(self, key, mods) {
                         continue;
@@ -936,6 +1043,7 @@ impl SlideApp {
         let t = theme::Tokens::get(&ctx);
         self.tick_media(&ctx);
         if self.show.is_some() {
+            self.anim_preview = None;
             show::ui(self, ui);
             self.perf.frame_ms = now_ms() - t0;
             return;
@@ -948,6 +1056,10 @@ impl SlideApp {
             ribbon::show(self, ui);
             status::status_bar(self, ui);
         }
+        let now = ui.input(|i| i.time);
+        if self.tick_anim_preview(now) {
+            ctx.request_repaint();
+        }
         egui::CentralPanel::default().frame(egui::Frame::NONE.fill(t.chrome)).show(ui, |ui| {
             if self.backstage.is_some() {
                 // File tab: the Backstage view replaces everything below the title bar.
@@ -1408,4 +1520,114 @@ mod tests {
         harness.run_steps(3);
         assert_eq!(harness.state().textures.canvas_renders, n, "an unchanged slide isn't rendered again");
     }
+
+    fn redder(px: [u8; 4]) -> i32 {
+        px[0] as i32 - px[1].max(px[2]) as i32
+    }
+
+    /// A fade entrance is hidden at the start of the preview clock and opaque once it has played.
+    #[test]
+    fn preview_hides_an_entrance_until_it_plays() {
+        let mut session = Session::with_new();
+        let text = session.execute("shape.insert", &json!({"preset": "rect", "rect": [40.0, 40.0, 220.0, 80.0]})).unwrap()["id"].as_u64().unwrap();
+        session.execute("text.set", &json!({"id": text, "text": "Alpha\nBeta"})).unwrap();
+        session.execute("animation.set", &json!({"effect": "fade", "duration": 1000})).unwrap();
+        session.execute("animation.options", &json!({"textBuild": "byParagraph"})).unwrap();
+        let doc = session.active().unwrap().doc.clone();
+        let tl = deckcraft_anim::ShowState::timeline(&doc, 0);
+        let shape = deckcraft_model::ShapeId(text as u32);
+        let para = |time: f64, i: usize| preview::shape_state_at(&tl, shape, time).paras.into_iter().find(|(p, _)| *p == i).map(|(_, s)| s).unwrap();
+        assert!(!para(0.0, 0).visible && !para(0.0, 1).visible, "entrances have not started");
+        let mid = para(0.25, 0);
+        assert!(mid.visible && mid.opacity > 0.05 && mid.opacity < 0.95, "{mid:?}");
+        assert!(!para(0.25, 1).visible, "the next paragraph waits for its step");
+
+        session.execute("animation.clear", &json!({})).unwrap();
+        let id = session.execute("shape.insert", &json!({"preset": "rect", "rect": [400.0, 300.0, 120.0, 80.0]})).unwrap()["id"].as_u64().unwrap();
+        session.execute("shape.fill", &json!({"id": id, "color": "#CC2200"})).unwrap();
+        session.execute("animation.set", &json!({"effect": "fade", "duration": 1000})).unwrap();
+        let doc = session.active().unwrap().doc.clone();
+        let tl = deckcraft_anim::ShowState::timeline(&doc, 0);
+        let (w, h) = (doc.slide_size.width.round().max(1.0) as u32, doc.slide_size.height.round().max(1.0) as u32);
+        let paint = |time: Option<f64>| {
+            let f = |sid: deckcraft_model::ShapeId| preview::shape_state_at(&tl, sid, time.unwrap_or(0.0));
+            let state: Option<&dyn Fn(deckcraft_model::ShapeId) -> deckcraft_render::ShapeState> = if time.is_some() { Some(&f) } else { None };
+            let opts = deckcraft_render::RenderOpts { scale: 1.0, size: Some((w, h)), state, ..Default::default() };
+            deckcraft_render::render_slide(&doc, 0, &opts).pixel(460, 340)
+        };
+        let rest = paint(None);
+        let start = paint(Some(0.0));
+        let end = paint(Some(tl.total_duration() + 0.05));
+        assert!(redder(rest) > 40, "the shape is filled at rest {rest:?}");
+        assert!(redder(start) < redder(rest) / 2, "hidden at the first preview frame {start:?} vs {rest:?}");
+        assert!(redder(end) > 40, "visible again once the sequence has played {end:?}");
+    }
+
+    #[test]
+    fn animation_preview_plays_on_the_canvas_then_stops() {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).with_step_dt(0.05).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        let none = harness.state_mut().run("animation.preview", json!({})).unwrap();
+        assert_eq!(none["playing"], false);
+        assert!(harness.state().status.as_ref().is_some_and(|s| s.0.contains("no animations")));
+        assert!(harness.state().show.is_none());
+
+        let id = harness.state_mut().session.execute("shape.insert", &json!({"preset": "rect", "rect": [200.0, 280.0, 180.0, 80.0]})).unwrap()["id"]
+            .as_u64()
+            .unwrap();
+        harness.state_mut().session.execute("animation.set", &json!({"effect": "fade", "duration": 400})).unwrap();
+        let started = harness.state_mut().run("animation.preview", json!({})).unwrap();
+        assert_eq!(started["playing"], true);
+        assert!(harness.state().show.is_none(), "preview stays on the editor canvas");
+        harness.run_steps(1);
+        let elapsed = harness.state().anim_preview.as_ref().map(|p| p.elapsed).unwrap();
+        assert!(elapsed < 0.02, "the clock latches on the first frame, got {elapsed}");
+        let renders = harness.state().textures.canvas_renders;
+        harness.run_steps(6);
+        let elapsed = harness.state().anim_preview.as_ref().map(|p| p.elapsed).unwrap();
+        assert!((0.2..0.5).contains(&elapsed), "{elapsed}");
+        assert!(harness.state().textures.canvas_renders > renders, "each preview frame redraws the slide");
+        assert!(harness.state().show.is_none());
+
+        harness.key_press(egui::Key::Escape);
+        harness.run_steps(1);
+        assert!(harness.state().anim_preview.is_none(), "Escape stops the preview");
+
+        harness.state_mut().run("animation.preview", json!({})).unwrap();
+        harness.run_steps(1);
+        assert!(harness.state().anim_preview.is_some());
+        harness.state_mut().run("animation.preview", json!({"on": false})).unwrap();
+        assert!(harness.state().anim_preview.is_none());
+
+        harness.state_mut().run("animation.preview", json!({})).unwrap();
+        harness.run_steps(1);
+        let centre = harness.state().slide_rect.unwrap().center();
+        harness.hover_at(centre);
+        harness.run_steps(1);
+        harness.drag_at(centre);
+        harness.run_steps(2);
+        assert!(harness.state().anim_preview.is_none(), "a click on the slide stops the preview");
+
+        harness.state_mut().run("animation.preview", json!({})).unwrap();
+        harness.run_steps(1);
+        harness.state_mut().session.execute("slide.new", &json!({})).unwrap();
+        harness.run_steps(1);
+        assert!(harness.state().anim_preview.is_none(), "leaving the slide stops the preview");
+
+        harness.state_mut().session.execute("slide.previous", &json!({})).unwrap();
+        harness.state_mut().session.execute("edit.select", &json!({"ids": [id]})).unwrap();
+        harness.state_mut().run("animation.preview", json!({})).unwrap();
+        harness.run_steps(1);
+        assert!(harness.state().anim_preview.is_some());
+        // 400 ms effect plus the hold.
+        harness.run_steps(30);
+        assert!(harness.state().anim_preview.is_none(), "the preview ends after the sequence");
+        assert!(harness.state().show.is_none());
+    }
 }
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..1be647f9 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -465,13 +465,9 @@ fn animation(app: &mut SlideApp, ui: &mut Ui) {
     let names: Vec<(u32, String)> = st.shapes().iter().map(|s| (s.id.0, s.name.clone())).collect();
     let selected: Vec<u32> = st.selection.shapes.iter().map(|i| i.0).collect();
     ui.horizontal(|ui| {
-        if ui.button("▶ Play All").clicked() {
-            let from = app.session.active().map(|d| d.selection.slide).unwrap_or(0);
-            app.start_show(from, true);
-            if let Some(s) = app.show.as_mut() {
-                s.preview_only = true;
-                s.autoplay = true;
-            }
+        let playing = app.anim_preview_active();
+        if ui.button(if playing { "■ Stop" } else { "▶ Play All" }).clicked() {
+            run(app, "animation.preview", json!({"on": !playing}));
         }
     });
     ui.separator();
diff --git a/crates/ui-egui/src/preview.rs b/crates/ui-egui/src/preview.rs
new file mode 100644
index 00000000..432a004b
--- /dev/null
+++ b/crates/ui-egui/src/preview.rs
@@ -0,0 +1,38 @@
+//! In-canvas animation preview: the current slide's effects played on the editor canvas
+//! (Animations ▸ Preview, Animation Pane ▸ Play All). The slide show uses the same mapping.
+
+use deckcraft_anim::Timeline;
+use deckcraft_geom::Vec2;
+use deckcraft_model::ShapeId;
+use deckcraft_render::{ParaState, ShapeState};
+
+/// How long the finished sequence stays on the canvas before the editor draws the slide at rest.
+pub const HOLD_SECS: f64 = 0.45;
+
+/// Shape and paragraph state when `step` main steps are done and the current step has played `t` seconds.
+pub fn shape_state(tl: &Timeline, id: ShapeId, step: usize, t: f64) -> ShapeState {
+    let a = tl.state(id, None, step, t);
+    ShapeState {
+        visible: a.visible,
+        opacity: a.opacity,
+        offset: Vec2::new(a.offset_x, a.offset_y),
+        scale: (a.scale_x, a.scale_y),
+        rotate: a.rotate,
+        clip: a.clip,
+        tint: a.tint,
+        paras: tl
+            .paragraph_targets(id)
+            .into_iter()
+            .map(|p| {
+                let a = tl.state(id, Some(p), step, t);
+                (p, ParaState { visible: a.visible, opacity: a.opacity, offset: Vec2::new(a.offset_x, a.offset_y) })
+            })
+            .collect(),
+    }
+}
+
+/// State on the play-everything clock (preview and Play All).
+pub fn shape_state_at(tl: &Timeline, id: ShapeId, time: f64) -> ShapeState {
+    let (step, t) = tl.locate(time);
+    shape_state(tl, id, step, t)
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..833742f4 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1523,13 +1523,10 @@ fn animations(app: &mut SlideApp, ui: &mut Ui) {
         s.animations.iter().find(|a| a.shape == *id).cloned()
     });
     group(ui, |ui| {
-        if big_button(ui, Icon::Preview, "Preview", true).clicked() {
-            let from = app.session.active().map(|d| d.selection.slide).unwrap_or(0);
-            app.start_show(from, true);
-            if let Some(s) = app.show.as_mut() {
-                s.preview_only = true;
-                s.autoplay = true;
-            }
+        let playing = app.anim_preview_active();
+        let (resp, _) = big_button_ex(ui, Icon::Preview, "Preview", true, false, playing);
+        if resp.on_hover_text("Play this slide's animations on the canvas").clicked() {
+            run(app, "animation.preview", json!({}));
         }
     });
     group(ui, |ui| {
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..9a96b7a9 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -4,7 +4,7 @@
 use deckcraft_anim::{Layer, LinkJump, ShowAction, ShowState, Source, Timeline};
 use deckcraft_model::text::Hyperlink;
 use deckcraft_model::{Presentation, ShapeId};
-use deckcraft_render::{ParaState, RenderOpts, ShapeState};
+use deckcraft_render::{RenderOpts, ShapeState};
 use egui::{Align2, Color32, CornerRadius, Mesh, Pos2, Rect, Sense, Stroke, TextureHandle, Ui, pos2, vec2};
 use serde_json::json;
 
@@ -180,24 +180,7 @@ impl Show {
 }
 
 fn state_for(tl: &Timeline, id: ShapeId, step: usize, t: f64) -> ShapeState {
-    let a = tl.state(id, None, step, t);
-    ShapeState {
-        visible: a.visible,
-        opacity: a.opacity,
-        offset: deckcraft_geom::Vec2::new(a.offset_x, a.offset_y),
-        scale: (a.scale_x, a.scale_y),
-        rotate: a.rotate,
-        clip: a.clip,
-        tint: a.tint,
-        paras: tl
-            .paragraph_targets(id)
-            .into_iter()
-            .map(|p| {
-                let a = tl.state(id, Some(p), step, t);
-                (p, ParaState { visible: a.visible, opacity: a.opacity, offset: deckcraft_geom::Vec2::new(a.offset_x, a.offset_y) })
-            })
-            .collect(),
-    }
+    crate::preview::shape_state(tl, id, step, t)
 }
 
 fn fit(avail: Rect, doc: &Presentation) -> Rect {
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index 40498422..f1f121d9 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -79,6 +79,14 @@ fn same(a: &Option<Arc<Master>>, b: &Option<Arc<Master>>) -> bool {
     }
 }
 
+/// Mix the preview playhead into the canvas cache key. Zero means "no preview", so a playhead of
+/// 0s still misses the at-rest texture (entrances start hidden).
+fn anim_key(anim: Option<(&deckcraft_anim::Timeline, f64)>) -> u64 {
+    let Some((_, t)) = anim else { return 0 };
+    let ms = if t.is_finite() { (t * 1000.0).clamp(0.0, 1.0e12) as u64 } else { 0 };
+    ms.wrapping_add(1).wrapping_mul(0x9E37_79B9_7F4A_7C15)
+}
+
 fn threads() -> u16 {
     if cfg!(target_arch = "wasm32") { 0 } else { std::thread::available_parallelism().map(|n| n.get().min(8) as u16).unwrap_or(0) }
 }
@@ -100,6 +108,7 @@ impl Textures {
         extra: u64,
         grayscale: bool,
         gif_times: &[(ShapeId, f64)],
+        anim: Option<(&deckcraft_anim::Timeline, f64)>,
     ) -> Option<(TextureHandle, Region)> {
         let slide = p.slides.get(index)?.clone();
         let master = master_of(p, &slide);
@@ -122,7 +131,7 @@ impl Textures {
             master: master.as_ref().map(|m| Arc::as_ptr(m) as usize).unwrap_or(0),
             size,
             edit,
-            extra: extra ^ grayscale as u64,
+            extra: extra ^ grayscale as u64 ^ anim_key(anim),
             want,
         };
         if let Some(e) = &self.canvas
@@ -132,8 +141,18 @@ impl Textures {
         }
         let t0 = crate::now_ms();
         let render = |region: Region| {
-            let opts =
-                RenderOpts { scale, edit, gif_times, threads: threads(), offset: region.offset(), size: Some(region.size()), ..Default::default() };
+            let state_of = |id: ShapeId| anim.map(|(tl, time)| crate::preview::shape_state_at(tl, id, time)).unwrap_or_default();
+            let state: Option<&dyn Fn(ShapeId) -> deckcraft_render::ShapeState> = if anim.is_some() { Some(&state_of) } else { None };
+            let opts = RenderOpts {
+                scale,
+                edit,
+                gif_times,
+                threads: threads(),
+                offset: region.offset(),
+                size: Some(region.size()),
+                state,
+                ..Default::default()
+            };
             deckcraft_render::render_slide_drawn(p, index, &opts)
         };
         let (mut img, drawn) = render(want);
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 8ec5d0f4..659d3736 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -1,6 +1,6 @@
 # Transitions and animations: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** major (transitions measured frame by frame against PowerPoint for Windows' video export and retuned; previous: created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Animations ▸ Preview plays the current slide on the editor canvas; previous: major, transitions measured frame by frame) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Transitions and animations are what make a deck a presentation, and the part of PowerPoint people
 notice first when it's missing. Scores roll up into [target-app-parity.md](target-app-parity.md)
@@ -72,7 +72,8 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 | Animation Painter | yes | yes (#54) |
 | Animation Pane: list, reorder, remove | yes | yes |
 | Animation Pane: advanced timeline (bars you drag) | yes | **no** |
-| Preview in the editor (current effect, from selected) | yes | partly |
+| Preview on the editor canvas (the current slide) | yes | yes |
+| Preview from the selected effect | yes | no |
 | Motion path editing (edit points, reverse, lock) | yes | partly (no edit points) |
 | Multiple animations on one object | yes | yes |
 | Round trip of the timing tree | yes | flattened to the pane list on read, rebuilt on write (`every_animation_effect_survives`) |
@@ -81,7 +82,7 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 
 | Work | Hours |
 |---|---|
-| Animation Pane timeline, preview from selected, effect dialog depth | 5–8 |
+| Animation Pane timeline, preview from the selected effect, effect dialog depth | 4–7 |
 | The remaining ~126 effects (most are parameter variations of existing ones) | 3–6 |
 | Rewind and other effect options on round trip (#77) | 1–2 |
 | Transition sounds | 1–2 |
@@ -93,5 +94,6 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Animations ▸ Preview and Animation Pane ▸ Play All play the current slide's animations on the editor canvas; preview from the selected effect is still open |
 | 2026-10-13 | major | Transitions measured frame by frame against PowerPoint's video export and retuned (mean diff 35.7 → 15.0); PowerPoint's XML defaults and option meanings; new options |
 | 2026-10-10 | major | Created: 48/48 transitions, 64 of ~190 animation effects, pane and option depth, estimates |
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..4c8dde04 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -55,7 +55,8 @@ effects project cards through a perspective camera and `anim::layer_mesh` subdiv
 textures stay straight; soft edges are per-corner opacities. The show renders the slides once per
 transition and only composites cached textures each frame; `render::composite_transition` is the
 CPU twin used by `deckcraft-cli render-transition` and the tests. The show window and the presenter view are egui viewports; animation state per shape
-comes from `anim::timeline` each frame. PDF export renders each slide at print resolution and
+comes from `anim::timeline` each frame. Animations ▸ Preview plays that same state on the editor
+canvas for the current slide, then draws the slide at rest. PDF export renders each slide at print resolution and
 overlays an invisible real-text layer with embedded font subsets.
 
 ## File I/O
@@ -78,5 +79,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Animation preview draws the current slide's timeline on the editor canvas |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 07741fde..fb5c2c1a 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -15,10 +15,10 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `engine.execute` / `ui.menu.invoke` / `command` | `{command, params}` | Run any command (see `engine.commands`; `deckcraft-cli describe ID` documents one) |
 | `engine.commands` | — | Every command: id, label, menu path, shortcut, params doc, enabled / disabled reason |
 | `document.inspect` | — | Slides, sections, layouts, shapes, selection |
-| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state, documents, perf (fps, render ms) |
+| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state, `animPreview` (canvas playback: slide, time, duration), documents, perf (fps, render ms) |
 | `ui.tool.select` | `{tool, preset?}` | `select`, `text`, `shape` + preset, any preset name, `curve`, `freeform`, `scribble`, `pen`, `highlighter`, `eraser` |
 | `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
-| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show) |
+| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show; Escape stops the canvas animation preview) |
 | `ui.ime` | `{preedit, active?: [start, end]}` / `{commit}` | An input method's composition through egui, as a real one arrives: shown in place on the slide or in a focused field; `{"preedit": ""}` cancels |
 | `ui.move` / `ui.click` / `ui.drag` | screen points | Real egui pointer input — reaches every widget, menu and pane |
 | `ui.set` | `{tab?, view?, pane?, notes?, zoom?, brightness?, ruler?, gridlines?, guides?, …}` | UI state (returns the full state) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..f592b7f6 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (animation preview plays on the editor canvas; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -26,7 +26,7 @@ revision history.
 | 7 | Fonts: only Regular, Bold and Italic faces (#69) | Feature | B | 3–5 | [ui-parity.md](ui-parity.md) |
 | 8 | Image paste fails on Windows and Linux (#53) | Feature | B | 2–4 | [ui-parity.md](ui-parity.md) |
 | 9 | Presenter view isn't placed on the second display | Hardware | B | 3–5 | [slideshow-parity.md](slideshow-parity.md) |
-| 10 | Animation Pane: no timeline, thin preview; 64 of ~190 effects | Feature | B (pane) | 10–16 | [animation-parity.md](animation-parity.md) |
+| 10 | Animation Pane: no timeline; preview is the whole slide, not from the selected effect; 64 of ~190 effects | Feature | B (pane) | 10–16 | [animation-parity.md](animation-parity.md) |
 | 11 | Charts: data grid editing, elements, `chartex` types | Feature | B (data, elements) | 12–20 | [parity-checklist.md](parity-checklist.md) |
 | 12 | Format Shape pane thinner than PowerPoint's | UI/UX | B | 6–10 | [ui-parity.md](ui-parity.md) |
 | 13 | No native macOS menu bar | UI/UX | B | 3–5 | [ui-parity.md](ui-parity.md) |
@@ -157,7 +157,10 @@ Detail in [file-format-parity.md](file-format-parity.md).
 - **Estimate:** 10–16 h.
 
 ### Animation Pane, effect count and preview
-Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a **beta blocker**.
+Animations ▸ Preview and the pane's Play All play the current slide's animations on the editor
+canvas (Escape or a click stops them). Still open: the advanced timeline, starting from the
+selected effect, and most of the effect gallery. Detail in
+[animation-parity.md](animation-parity.md). 10–16 h; the pane's timeline is a **beta blocker**.
 
 ### Notes and Handout masters
 - **Evidence:** checklist row missing; PPTX writes a notes master but there's no view to edit it,
@@ -256,6 +259,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Animation preview plays the current slide on the editor canvas; the pane gap keeps the timeline, preview from the selected effect, and the remaining effects |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..92afd204 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -1,14 +1,14 @@
 # PowerPoint feature checklist
 
-> **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Generated:** 2026-10-13 (summary by `cargo xtask parity`; Preview in editor re-scored; earlier rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 79%** over 191 features.
+**Weighted breadth parity: 80%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
+| P1 | 65 | 39 | 20 | 6 | 75% |
 | P2 | 54 | 13 | 15 | 26 | 38% |
 
 | Area | Parity |
@@ -28,7 +28,7 @@ The summary between `<!-- SUMMARY -->
 | Pictures | 48% |
 | Media | 67% |
 | Transitions | 92% |
-| Animations | 79% |
+| Animations | 85% |
 | Slide show | 66% |
 | Review | 60% |
 | Draw | 33% |
@@ -208,7 +208,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Animations | By-paragraph text builds | P1 | D |
 | Animations | Triggers | P2 | D |
 | Animations | Animation Painter | P2 | D |
-| Animations | Preview in editor | P1 | P |
+| Animations | Preview in editor | P1 | D |
 | Slide show | Full-screen show from start / current | P0 | D |
 | Slide show | Navigation (keys, click, go to slide, blank screen) | P0 | D |
 | Slide show | Presenter view (notes, next slide, timer) | P0 | P |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..c3a4efc9 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (canvas animation preview; beta item 9 keeps the timeline; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -46,7 +46,7 @@ Beta means ~75% ready for real work and opening and saving PowerPoint's `.pptx`
 | 6 | Localization infrastructure + zh-Hans, es, fr, de, ja (with IME) | 27–46 | Localization 8 → ~40% |
 | 7 | Font weights (#69), image paste (#53), Tab in text (#78) | 6–11 | Features |
 | 8 | Charts: data grid, elements | 6–10 | Features |
-| 9 | Animation Pane timeline, preview, effect options | 5–8 | Features |
+| 9 | Animation Pane timeline, preview from the selected effect, effect options | 4–7 | Features |
 | 10 | Presenter view on the right display, timer controls | 3–5 | Hardware, Slide show |
 | 11 | Native macOS menu bar, Format Shape pane depth, start screen and window chrome fixes | 13–22 | UI/UX 60 → 75% |
 | 12 | Performance baseline and the obvious fixes | 4–8 | Performance |
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Canvas animation preview landed; beta item 9 keeps the timeline and preview from the selected effect |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..c2961170 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (Preview in editor re-scored done; breadth 79% → 80%, Animations 79% → 85%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -11,7 +11,7 @@ number.
 
 | Number | Value | Kind |
 |---|---|---|
-| **Feature breadth** (weighted checklist) | **79%** over 191 features (P0 92%, P1 75%, P2 36%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md), rows re-scored 2026-10-10 |
+| **Feature breadth** (weighted checklist) | **80%** over 191 features (P0 92%, P1 75%, P2 36%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md); Preview in editor re-scored 2026-10-13 |
 | Menu-bar coverage | **59%** (128 of 217 app-specific PowerPoint menu items have a DeckCraft command or UI label of the same name) | **measured** (heuristic lower bound): script matching the 2026-10-07 PowerPoint menu dump against the 226 engine command labels and the UI's strings; excludes the app, Window and Help menus and the subtitle language lists |
 | **Ready for real work** | **~55%** | **estimated**: weighted dimension table below (was ~56% until the features row was recomputed from written area weights) |
 | **Mainstream practitioner** | **~53%** | **estimated**: [method below](#mainstream-practitioner-and-essentials-user) |
@@ -64,7 +64,7 @@ The weights are what those users actually depend on, written down so the total c
 
 | Dimension | Weight | Ready | Hours to full | Doc | Evidence |
 |---|---:|---:|---|---|---|
-| Features (breadth × depth) | 30% | ~62% | 140–240 | [parity-checklist.md](parity-checklist.md), [animation-parity.md](animation-parity.md), [slideshow-parity.md](slideshow-parity.md) | Breadth 79% measured. Depth lags: 37 of 191 rows are partial, and users found depth bugs in rows scored done within two days (#53, #60, #69, #70, #74, #77, #78) |
+| Features (breadth × depth) | 30% | ~62% | 140–240 | [parity-checklist.md](parity-checklist.md), [animation-parity.md](animation-parity.md), [slideshow-parity.md](slideshow-parity.md) | Breadth 80% measured. Depth lags: partial rows remain, and users found depth bugs in rows scored done within two days (#53, #60, #69, #70, #74, #77, #78) |
 | File formats | 20% | ~58% | 60–110 | [file-format-parity.md](file-format-parity.md) | PPTX reads and writes every main part and keeps unknown objects; files open in PowerPoint without repair. But it has never met a corpus of real decks, EMF/WMF/SVG pictures don't decode, comments/media/rewind settings are lost on round trip, and there is no `.ppt`, `.pptm`, `.odp`, video or GIF export |
 | UI/UX fidelity | 15% | ~60% | 30–50 | [ui-parity.md](ui-parity.md) | All 10 ribbon tabs and the contextual tabs exist; Format Shape pane, Animation Pane, dialogs and menus are thinner than PowerPoint's; no native macOS menu bar; user reports #17, #71, #73, #76 |
 | Stability | 10% | ~60% | 10–20 | [gaps.md](gaps.md) | Never-crash rules, a panic guard round every command, PPTX fuzz/malformed tests. But startup crashes on some Windows GPUs (#40, #59) and Close discards edits without asking (#60) |
@@ -194,14 +194,14 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Pictures | 7 | 48% | ~45% | 12–20 | SVG/EMF/WMF, clipboard paste on Windows/Linux (#53), artistic effects, remove background, compress | [file-format-parity.md](file-format-parity.md) |
 | Media | 4 | 67% | ~60% | 8–14 | WMA/WMV decode, record audio/screen, icons and 3-D models, playback options lost on PPTX round trip (#74) | [file-format-parity.md](file-format-parity.md) |
 | Transitions | 4 | 92% | ~80% | 4–8 | Transition sounds, 3-D transitions approximated in 2-D | [animation-parity.md](animation-parity.md) |
-| Animations | 6 | 79% | ~65% | 10–16 | 64 of PowerPoint's ~190 effects, Animation Pane timeline, preview, rewind lost on save (#77) | [animation-parity.md](animation-parity.md) |
+| Animations | 6 | 85% | ~65% | 10–16 | 64 of PowerPoint's ~190 effects, Animation Pane timeline, preview from the selected effect, rewind lost on save (#77) | [animation-parity.md](animation-parity.md) |
 | Slide show and presenter view | 8 | 66% | ~60% | 10–16 | Second-display placement, laser pointer, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
 | Review | 3 | 60% | ~45% | 8–14 | Modern comment threads on round trip (#70), compare, version history, real spelling dictionaries | [file-format-parity.md](file-format-parity.md) |
 | Draw (ink) | 2 | 33% | ~30% | 5–9 | Pen pressure, ink to shape/text/math, lasso | [hardware-parity.md](hardware-parity.md) |
 | Undo and clipboard | 3 | 88% | ~75% | 3–5 | Paste Special, image paste (#53) | [ui-parity.md](ui-parity.md) |
 | Automation ✱ | — | 100% | ahead | 0 | | [mcp.md](mcp.md) |
 | Platforms ✱ | — | 67% | ~80% | see platforms | | [ROADMAP.md](../ROADMAP.md) |
-| **Total (feature areas)** | 110 | **79%** | **~62%** | **~140–240** | | |
+| **Total (feature areas)** | 110 | **80%** | **~62%** | **~140–240** | | |
 
 ## What works today (evidence)
 
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Preview in editor scored done: breadth 79% → 80%, Animations area 79% → 85% |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..31869d5d 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (animation preview on the editor canvas; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -61,7 +61,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
 | Format Background pane | yes | yes |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
-| Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
+| Animation Pane | list + advanced timeline | list, reorder, timing, play the current slide on the canvas; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
 | Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Animations ▸ Preview and Animation Pane ▸ Play All play the current slide on the editor canvas |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 4b2548c99b2ff73830727430e632a80f494e920e Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:22:16 +0300
Subject: [PATCH 196/376] Text: Tabs dialog and the ruler's tab selector
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Format > Tabs opens from Home > Line Spacing > Tabs…, from the
Paragraph dialog, or by double-clicking a tab stop on the ruler. It
lists the selected paragraphs' tab stops (inches) with their
alignment. Set adds or replaces a stop at a position with Left,
Center, Right or Decimal alignment, Clear removes one, Clear All
removes them all, and you can change the default tab spacing. OK
applies everything in one undo step through format.tabs, which now
takes `set`. Cancel changes nothing.

The ruler's corner has PowerPoint's tab selector. A click cycles left,
center, right and decimal, and a click on the ruler then sets that
kind of stop. Presses on the rulers no longer reach the slide, so
they don't end text editing.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/format.rs      | 12 +++-
 crates/engine/src/cmd/ruler_tests.rs |  3 +
 crates/ui-egui/src/canvas.rs         | 77 +++++++++++++++++------
 crates/ui-egui/src/dialogs.rs        | 92 ++++++++++++++++++++++++++++
 crates/ui-egui/src/ribbon.rs         |  3 +
 crates/ui-egui/src/ruler_tests.rs    | 75 +++++++++++++++++++++++
 docs/parity-checklist.md             |  6 +-
 7 files changed, 243 insertions(+), 25 deletions(-)

diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index 8581cb5d..0251e6ab 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -145,7 +145,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Tabs…",
             ["Home", "Paragraph"],
             None,
-            "{add?: {pos, align?: l|ctr|r|dec}, move?: {from, to}, remove?: pos, clear?: bool, defaultTab?: pt} on the selected paragraphs (pos in pt from the text area's left)",
+            "{set?: [{pos, align?}] (replaces all), add?: {pos, align?: l|ctr|r|dec}, move?: {from, to}, remove?: pos, clear?: bool, defaultTab?: pt} on the selected paragraphs (pos in pt from the text area's left)",
             has_text_or_shapes,
             tabs
         ),
@@ -738,16 +738,22 @@ fn tabs(s: &mut Session, p: &Value) -> Result<Value> {
     let add = p.get("add").and_then(|a| fin(a.get("pos").and_then(Value::as_f64)).map(|pos| (pos, align_of(a).to_string())));
     let mv = p.get("move").and_then(|m| Some((fin(m.get("from").and_then(Value::as_f64))?, fin(m.get("to").and_then(Value::as_f64))?)));
     let remove = fin(p.get("remove").and_then(Value::as_f64));
+    let set: Option<Vec<deckcraft_model::text::TabStop>> = p.get("set").and_then(Value::as_array).map(|a| {
+        a.iter()
+            .take(MAX_TABS * 4)
+            .filter_map(|t| Some(deckcraft_model::text::TabStop { pos: fin(t.get("pos").and_then(Value::as_f64))?, align: align_of(t).to_string() }))
+            .collect()
+    });
     let clear = bool_or(p, "clear", false);
     let default_tab = fin(p.get("defaultTab").and_then(Value::as_f64)).filter(|v| *v >= 1.0);
-    if add.is_none() && mv.is_none() && remove.is_none() && !clear && default_tab.is_none() {
+    if set.is_none() && add.is_none() && mv.is_none() && remove.is_none() && !clear && default_tab.is_none() {
         return Err(bad("format.tabs", "nothing to change"));
     }
     // The stops as the caret's paragraph shows them (inherited ones included), so editing a
     // placeholder's tab that came from its layout works like editing one set on the paragraph.
     let base = current_para(s).tabs.unwrap_or_default();
     let near = |a: f64, b: f64| (a - b).abs() < 0.5;
-    let mut stops = if clear { vec![] } else { base };
+    let mut stops = if clear { vec![] } else { set.unwrap_or(base) };
     if let Some(at) = remove {
         stops.retain(|t| !near(t.pos, at));
     }
diff --git a/crates/engine/src/cmd/ruler_tests.rs b/crates/engine/src/cmd/ruler_tests.rs
index 1d23154e..95c87c6c 100644
--- a/crates/engine/src/cmd/ruler_tests.rs
+++ b/crates/engine/src/cmd/ruler_tests.rs
@@ -56,4 +56,7 @@ fn tabs_add_move_remove_clear_and_undo() {
         s.execute("format.tabs", &json!({"add": {"pos": i as f64 * 3.0}})).unwrap();
     }
     assert!(tabs(&mut s).len() <= 32);
+    s.execute("format.tabs", &json!({"set": [{"pos": 90, "align": "dec"}, {"pos": 30, "align": "right"}, {"pos": "x"}], "defaultTab": 36})).unwrap();
+    assert_eq!(tabs(&mut s), vec![(30.0, "r".into()), (90.0, "dec".into())], "set replaces all, sorted, bad entries dropped");
+    assert_eq!(s.execute("format.ruler", &json!({})).unwrap()["defaultTab"].as_f64(), Some(36.0));
 }
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 073f9f41..f29f62f5 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -467,25 +467,29 @@ fn ruler_markers(app: &mut SlideApp, ui: &mut Ui, p: &egui::Painter, avail: Rect
         if gone {
             continue;
         }
-        let (x, y) = (sx(q), top.max.y - 2.0);
-        let st = Stroke::new(1.5, t.text);
-        p.line_segment([pos2(x, y - 6.0), pos2(x, y)], st);
-        match align.as_str() {
-            "r" => {
-                p.line_segment([pos2(x - 5.0, y), pos2(x, y)], st);
-            }
-            "ctr" => {
-                p.line_segment([pos2(x - 4.0, y), pos2(x + 4.0, y)], st);
-            }
-            "dec" => {
-                p.line_segment([pos2(x - 4.0, y), pos2(x + 4.0, y)], st);
-                p.circle_filled(pos2(x + 3.0, y - 4.0), 1.0, t.text);
-            }
-            _ => {
-                p.line_segment([pos2(x, y), pos2(x + 5.0, y)], st);
-            }
-        }
+        tab_glyph(p, pos2(sx(q), top.max.y - 2.0), align, t.text);
     }
+    // The tab selector in the ruler's corner: a click cycles left, center, right, decimal; a click
+    // on the ruler then sets that kind of stop.
+    let kind_id = ui.id().with("ruler_tab_kind");
+    let mut kind: usize = ui.data(|d| d.get_temp(kind_id)).unwrap_or(0);
+    let corner = Rect::from_min_size(avail.min, vec2(16.0, 16.0));
+    let cr = ui.interact(corner, ui.id().with("ruler_tab_selector"), Sense::click());
+    const KINDS: [(&str, &str); 4] = [("l", "Left Tab"), ("ctr", "Center Tab"), ("r", "Right Tab"), ("dec", "Decimal Tab")];
+    if cr.clicked() {
+        kind = (kind + 1) % KINDS.len();
+        ui.data_mut(|d| d.insert_temp(kind_id, kind));
+    }
+    let (kind_align, kind_label) = KINDS[kind % KINDS.len()];
+    cr.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, true, kind_label));
+    let cr = cr.on_hover_text(format!("{kind_label} (click to change)"));
+    p.rect_stroke(
+        corner.shrink(2.0),
+        CornerRadius::same(2),
+        Stroke::new(1.0, if cr.hovered() { t.accent } else { t.text_faint }),
+        egui::StrokeKind::Inside,
+    );
+    tab_glyph(p, pos2(corner.center().x - 1.0, corner.center().y + 3.0), kind_align, t.text);
     if drag.is_some() {
         ui.ctx().set_cursor_icon(egui::CursorIcon::ResizeHorizontal);
     }
@@ -511,7 +515,37 @@ fn ruler_markers(app: &mut SlideApp, ui: &mut Ui, p: &egui::Painter, avail: Rect
         && at.x >= area.min.x
         && at.x <= area.max.x
     {
-        let _ = app.run("format.tabs", json!({"add": {"pos": to_q(at.x), "align": "l"}}));
+        let near_tab = tabs.iter().any(|(pos, _)| (sx(*pos) - at.x).abs() <= 5.0);
+        if resp.double_clicked() || near_tab {
+            // A double-click on a stop opens the Tabs dialog, as in PowerPoint.
+            if resp.double_clicked() {
+                app.dialog = Some(crate::dialogs::Dialog::new("tabs"));
+            }
+        } else {
+            let _ = app.run("format.tabs", json!({"add": {"pos": to_q(at.x), "align": kind_align}}));
+        }
+    }
+}
+
+/// A tab-stop mark with its foot at `at`: └ left, ┴ center, ┘ right, ┴ with a dot decimal.
+fn tab_glyph(p: &egui::Painter, at: Pos2, align: &str, col: Color32) {
+    let (x, y) = (at.x, at.y);
+    let st = Stroke::new(1.5, col);
+    p.line_segment([pos2(x, y - 6.0), pos2(x, y)], st);
+    match align {
+        "r" => {
+            p.line_segment([pos2(x - 5.0, y), pos2(x, y)], st);
+        }
+        "ctr" => {
+            p.line_segment([pos2(x - 4.0, y), pos2(x + 4.0, y)], st);
+        }
+        "dec" => {
+            p.line_segment([pos2(x - 4.0, y), pos2(x + 4.0, y)], st);
+            p.circle_filled(pos2(x + 3.0, y - 4.0), 1.0, col);
+        }
+        _ => {
+            p.line_segment([pos2(x, y), pos2(x + 5.0, y)], st);
+        }
     }
 }
 
@@ -519,6 +553,11 @@ fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
     let tol = (4.0 / xf.scale) as f64;
     let m = mods(ui);
     let Some(pos) = resp.interact_pointer_pos().or(resp.hover_pos()) else { return };
+    // The rulers have their own controls; a press there mustn't reach the slide (and end text
+    // editing). A drag already under way keeps going over them.
+    if app.ui.ruler && !app.session.tool.dragging() && (pos.y < resp.rect.min.y + 16.0 || pos.x < resp.rect.min.x + 16.0) {
+        return;
+    }
     let p = xf.to_slide(pos);
     let ev = |kind| PointerEvent { kind, x: p.x, y: p.y, mods: m, tol };
     let primary = ui.input(|i| i.pointer.primary_pressed());
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..dd4089c6 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -43,6 +43,7 @@ fn title(id: &str) -> &'static str {
         "renameShape" => "Rename",
         "renameLayout" => "Rename Layout",
         "paragraph" => "Paragraph",
+        "tabs" => "Tabs",
         "about" => "About DeckCraft",
         "preferences" => "Preferences",
         "export" => "Export",
@@ -388,6 +389,12 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             field(ui, d, "Spacing before (pt):", "before", "0");
             field(ui, d, "Spacing after (pt):", "after", "0");
             field(ui, d, "Line spacing (lines):", "lines", "1.0");
+            ui.add_space(4.0);
+            if ui.button("Tabs…").clicked() {
+                app.dialog = None;
+                *d = Dialog::new("tabs");
+                return false;
+            }
             let (ok, cancel) = buttons(ui, "OK");
             if ok {
                 run(
@@ -398,6 +405,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             }
             ok || cancel
         }
+        "tabs" => tabs_dialog(app, ui, d),
         "export" => {
             ui.label("Export the presentation as:");
             let fmt = d.get("fmt", "pdf");
@@ -829,3 +837,87 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+const TAB_KINDS: [(&str, &str); 4] = [("l", "Left"), ("ctr", "Center"), ("r", "Right"), ("dec", "Decimal")];
+
+/// Format › Tabs: the default spacing and the tab stops of the selected paragraphs, edited as a
+/// list (inches, as PowerPoint's dialog) and applied together with OK.
+fn tabs_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    if !d.fields.contains_key("stops") {
+        let r = app.session.execute("format.ruler", &json!({})).unwrap_or_default();
+        let stops: Vec<String> = r["tabs"]
+            .as_array()
+            .map(|a| a.iter().filter_map(|t| Some(format!("{}:{}", t["pos"].as_f64()? / 72.0, t["align"].as_str().unwrap_or("l")))).collect())
+            .unwrap_or_default();
+        d.fields.insert("stops".into(), stops.join("|"));
+        d.fields.insert("default".into(), format!("{}", r["defaultTab"].as_f64().unwrap_or(72.0) / 72.0));
+    }
+    let mut stops: Vec<(f64, String)> = d
+        .get("stops", "")
+        .split('|')
+        .filter_map(|x| {
+            let (p, a) = x.split_once(':')?;
+            Some((p.parse::<f64>().ok().filter(|v| v.is_finite())?, a.to_string()))
+        })
+        .collect();
+    field(ui, d, "Default tab stops (in):", "default", "1");
+    ui.add_space(6.0);
+    ui.label("Tab stops:");
+    let mut remove = None;
+    egui::Grid::new("tab_stops").num_columns(3).spacing(vec2(12.0, 4.0)).show(ui, |ui| {
+        if stops.is_empty() {
+            ui.label("(none)");
+            ui.end_row();
+        }
+        for (i, (pos, align)) in stops.iter().enumerate() {
+            ui.label(format!("{pos:.2}\""));
+            ui.label(TAB_KINDS.iter().find(|k| k.0 == align).map(|k| k.1).unwrap_or("Left"));
+            if ui.small_button("Clear").on_hover_text(format!("Clear the tab at {pos:.2}\"")).clicked() {
+                remove = Some(i);
+            }
+            ui.end_row();
+        }
+    });
+    if let Some(i) = remove {
+        stops.remove(i);
+    }
+    ui.add_space(6.0);
+    ui.horizontal(|ui| {
+        ui.label("Tab stop position (in):");
+        let mut v = d.get("newpos", "");
+        ui.add(egui::TextEdit::singleline(&mut v).desired_width(60.0));
+        d.fields.insert("newpos".into(), v);
+    });
+    let cur = d.get("newalign", "l");
+    ui.horizontal(|ui| {
+        ui.label("Alignment:");
+        for (k, label) in TAB_KINDS {
+            if ui.radio(cur == k, label).clicked() {
+                d.fields.insert("newalign".into(), k.into());
+            }
+        }
+    });
+    ui.horizontal(|ui| {
+        if ui.button("Set").clicked()
+            && let Some(p) = Some(num(d, "newpos", f64::NAN)).filter(|v| v.is_finite() && *v >= 0.0 && *v <= 56.0)
+        {
+            stops.retain(|(q, _)| (q - p).abs() > 0.005);
+            stops.push((p, d.get("newalign", "l")));
+            stops.sort_by(|a, b| a.0.total_cmp(&b.0));
+            d.fields.insert("newpos".into(), String::new());
+        }
+        if ui.button("Clear All").clicked() {
+            stops.clear();
+        }
+    });
+    d.fields.insert("stops".into(), stops.iter().map(|(p, a)| format!("{p}:{a}")).collect::<Vec<_>>().join("|"));
+    let (ok, cancel) = buttons(ui, "OK");
+    if ok {
+        let set: Vec<Value> = stops.iter().map(|(p, a)| json!({"pos": p * 72.0, "align": a})).collect();
+        let dt = num(d, "default", 1.0).clamp(0.02, 56.0) * 72.0;
+        if let Err(e) = app.run("format.tabs", json!({"set": set, "defaultTab": dt})) {
+            app.set_status(e);
+        }
+    }
+    ok || cancel
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..3df4a781 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -594,6 +594,9 @@ fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                     if ui.button("Line Spacing Options…").clicked() {
                         app.dialog = Some(crate::dialogs::Dialog::new("paragraph"));
                     }
+                    if ui.button("Tabs…").clicked() {
+                        app.dialog = Some(crate::dialogs::Dialog::new("tabs"));
+                    }
                 });
                 let r = icon_toggle(ui, Icon::Columns, "Columns", en, false);
                 egui::Popup::menu(&r).show(|ui| {
diff --git a/crates/ui-egui/src/ruler_tests.rs b/crates/ui-egui/src/ruler_tests.rs
index fd12d206..7c313563 100644
--- a/crates/ui-egui/src/ruler_tests.rs
+++ b/crates/ui-egui/src/ruler_tests.rs
@@ -83,3 +83,78 @@ fn drag_indents_add_move_and_remove_tabs_on_the_ruler() {
     drag(&mut h, Pos2::new(rx(pos), top + 12.0), Pos2::new(rx(pos), top + 80.0));
     assert!(ruler(&mut h)["tabs"].as_array().unwrap().is_empty());
 }
+
+fn editing_harness() -> Harness<'static, SlideApp> {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    let id = s.execute("insert.textBox", &json!({"rect": [100, 150, 500, 40]})).unwrap()["id"].as_u64().unwrap();
+    s.execute("text.edit", &json!({"id": id})).unwrap();
+    s.execute("text.insert", &json!({"text": "Item\t9.50"})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.ruler = true;
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+#[test]
+fn the_tab_selector_picks_the_kind_of_stop_a_click_sets() {
+    use egui_kittest::kittest::Queryable;
+    let mut h = editing_harness();
+    let (slide, k) = (h.state().slide_rect.unwrap(), h.state().canvas_scale);
+    let x0 = ruler(&mut h)["x"].as_f64().unwrap() as f32;
+    let top = h.state().canvas_rect.unwrap().min.y;
+    let rx = |q: f32| slide.min.x + (x0 + q) * k;
+    let corner = h.state().canvas_rect.unwrap().min + egui::vec2(8.0, 8.0);
+    assert!(h.query_by_label("Left Tab").is_some());
+    for _ in 0..3 {
+        click(&mut h, corner);
+    }
+    assert!(h.query_by_label("Decimal Tab").is_some());
+    click(&mut h, Pos2::new(rx(200.0), top + 12.0));
+    let r = ruler(&mut h);
+    assert_eq!(r["tabs"][0]["align"], "dec", "{r}");
+    if let Ok(img) = h.render() {
+        let _ = img.save("/tmp/ruler_decimal.png");
+    }
+}
+
+#[test]
+fn tabs_dialog_sets_clears_and_applies_on_ok() {
+    use egui_kittest::kittest::Queryable;
+    let mut h = editing_harness();
+    h.state_mut().session.execute("format.tabs", &json!({"add": {"pos": 36}})).unwrap();
+    h.state_mut().dialog = Some(crate::dialogs::Dialog::new("tabs"));
+    h.run_steps(3);
+    assert!(h.query_by_label_contains("0.50\"").is_some(), "the existing stop is listed");
+    let d = h.state_mut().dialog.as_mut().unwrap();
+    d.fields.insert("newpos".into(), "2".into());
+    d.fields.insert("default".into(), "0.5".into());
+    h.run_steps(1);
+    h.get_by_label("Center").click();
+    h.run_steps(2);
+    h.get_by_label("Set").click();
+    h.run_steps(2);
+    if let Ok(img) = h.render() {
+        let _ = img.save("/tmp/tabs_dialog.png");
+    }
+    // Nothing changes until OK.
+    assert_eq!(ruler(&mut h)["tabs"].as_array().unwrap().len(), 1);
+    h.query_all_by_label("Clear").next().expect("a Clear button per stop").click();
+    h.run_steps(2);
+    h.get_by_label("OK").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none());
+    let r = ruler(&mut h);
+    assert_eq!(r["tabs"].as_array().unwrap().len(), 1, "{r}");
+    assert_eq!((r["tabs"][0]["pos"].as_f64(), r["tabs"][0]["align"].as_str()), (Some(144.0), Some("ctr")));
+    assert_eq!(r["defaultTab"].as_f64(), Some(36.0));
+    h.state_mut().session.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(ruler(&mut h)["tabs"][0]["pos"].as_f64(), Some(36.0), "one undo step");
+}
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index a76ca062..50e56824 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -9,7 +9,7 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 39 | 20 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 14 | 14 | 26 | 39% |
 
 | Area | Parity |
 |---|---|
@@ -21,7 +21,7 @@ The summary between `<!-- SUMMARY -->
 | Shapes | 88% |
 | Format | 83% |
 | Arrange | 100% |
-| Text | 80% |
+| Text | 81% |
 | Tables | 89% |
 | Charts | 65% |
 | SmartArt | 33% |
@@ -148,7 +148,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Text | Bullets and numbering | P0 | D |
 | Text | Picture bullets, custom bullet symbols | P2 | P |
 | Text | List levels (Tab / Shift+Tab) | P0 | D |
-| Text | Tab stops | P2 | P |
+| Text | Tab stops | P2 | D |
 | Text | Columns | P2 | D |
 | Text | Vertical anchor, margins, wrap | P0 | D |
 | Text | Autofit (shrink on overflow, resize shape) | P0 | D |

From 641fa36a8eb2577a4df11326227f66ce96622cc9 Mon Sep 17 00:00:00 2001
From: Andreas Haraminac <andreas.haraminac@gmail.com>
Date: Tue, 13 Oct 2026 21:24:26 +0000
Subject: [PATCH 197/376] Media.seek: preserve decoded frames and EOF across
 video seeks

---
 ROADMAP.md                   |  4 ++-
 crates/media/src/feed.rs     | 58 ++++++++++++++++++++++++++++++++++--
 crates/media/tests/decode.rs | 17 +++++++++++
 docs/slideshow-parity.md     |  5 ++--
 4 files changed, 79 insertions(+), 5 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..6adab633 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (video-seek race fixed and regression-tested; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-13 | Video seeks and loops keep newly decoded frames and end-of-stream notifications; stale generations are filtered when consumed (upstream #416). Deterministic queue coverage and repeated seeks across H.264, HEVC, VP9 and AV1 |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | trivial | Progress log: video seek frame-loss race and regression coverage |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/media/src/feed.rs b/crates/media/src/feed.rs
index 721be858..f4b5fce4 100644
--- a/crates/media/src/feed.rs
+++ b/crates/media/src/feed.rs
@@ -66,8 +66,8 @@ impl VideoFeed {
         #[cfg(not(target_arch = "wasm32"))]
         {
             let _ = self.tx.send(Cmd::Seek(t, self.generation));
-            // Unblock the worker if it's waiting to hand over a stale frame.
-            while self.rx.try_recv().is_ok() {}
+            // pull() discards stale generations and unblocks the worker. Draining here could
+            // also discard the new generation's frames or EOF if the worker handles seek fast.
         }
         #[cfg(target_arch = "wasm32")]
         self.dec.seek(t);
@@ -178,3 +178,57 @@ fn worker(mut dec: VideoDecoder, cmds: std::sync::mpsc::Receiver<Cmd>, frames: s
         }
     }
 }
+
+#[cfg(all(test, not(target_arch = "wasm32")))]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn seek_keeps_new_generation_frames_and_end_of_stream() {
+        let (tx, _commands) = std::sync::mpsc::channel();
+        let (frames, rx) = std::sync::mpsc::sync_channel(AHEAD);
+        let frame = |time| Frame { time, width: 1, height: 1, rgba: vec![0, 0, 0, 255] };
+        frames.send((0, Some(frame(0.3)))).expect("stale frame");
+        frames.send((0, None)).expect("stale end of stream");
+        // Model a fast worker's seek response already waiting when seek drains the queue.
+        frames.send((1, Some(frame(0.0)))).expect("new frame");
+        frames.send((1, None)).expect("new end of stream");
+        let mut feed = VideoFeed { size: (1, 1), current: None, next: None, generation: 0, ended: false, tx, rx };
+
+        feed.seek(0.05);
+        let shown = feed.frame_at(0.05).expect("frame from the new generation");
+        assert_eq!(shown.time, 0.0);
+        assert!(feed.ended());
+
+        frames.send((2, Some(frame(0.3)))).expect("superseded seek frame");
+        frames.send((2, None)).expect("superseded seek end of stream");
+        frames.send((3, Some(frame(0.0)))).expect("latest seek frame");
+        frames.send((3, None)).expect("latest seek end of stream");
+        feed.seek(0.35);
+        feed.seek(0.05);
+        assert_eq!(feed.frame_at(0.05).expect("latest seek wins").time, 0.0);
+        assert!(feed.ended());
+    }
+
+    #[test]
+    fn seek_unblocks_worker_when_stale_queue_is_full() {
+        let (tx, commands) = std::sync::mpsc::channel();
+        let (frames, rx) = std::sync::mpsc::sync_channel(AHEAD);
+        let frame = || Frame { time: 0.0, width: 1, height: 1, rgba: vec![0, 0, 0, 255] };
+        for _ in 0..AHEAD {
+            frames.send((0, Some(frame()))).expect("fill stale queue");
+        }
+        let worker = std::thread::spawn(move || {
+            let Cmd::Seek(_, generation) = commands.recv().expect("seek command");
+            frames.send((generation, Some(frame()))).expect("seek frame");
+            frames.send((generation, None)).expect("seek end of stream");
+        });
+        let mut feed = VideoFeed { size: (1, 1), current: None, next: None, generation: 0, ended: false, tx, rx };
+
+        feed.seek(0.05);
+        let shown = feed.frame_at_blocking(0.05, std::time::Duration::from_secs(5)).expect("worker unblocked");
+        assert_eq!(shown.time, 0.0);
+        assert!(feed.ended());
+        worker.join().expect("worker completed");
+    }
+}
diff --git a/crates/media/tests/decode.rs b/crates/media/tests/decode.rs
index b3179445..e4a57490 100644
--- a/crates/media/tests/decode.rs
+++ b/crates/media/tests/decode.rs
@@ -312,6 +312,23 @@ fn video_feed_follows_the_clock() {
     assert!(f.is_some_and(|v| (v - 0.5).abs() < 0.02), "{f:?}");
 }
 
+#[test]
+fn video_feed_repeated_seeks_keep_the_requested_frame() {
+    let timeout = Duration::from_secs(5);
+    for name in ["clip-h264.mov", "clip-hevc.mp4", "clip-vp9.webm", "clip-av1.mkv"] {
+        let mut feed = deckcraft_media::VideoFeed::new(fixture(name)).expect("feed");
+        for _ in 0..20 {
+            // A decoder can finish this small clip before the consumer next polls it.
+            // Rewinding must keep the new generation's first frame, even at end of stream.
+            feed.seek(0.05);
+            let frame = feed.frame_at_blocking(0.05, timeout).expect("frame after rewind");
+            assert_eq!(frame.time, 0.0, "{name}");
+            let frame = feed.frame_at_blocking(0.45, timeout).expect("frame after advancing");
+            assert!((frame.time - 0.4).abs() < 0.02, "{name}: {}", frame.time);
+        }
+    }
+}
+
 #[test]
 fn player_plays_decoded_audio_through_the_mixer() {
     use deckcraft_media::{ClipParams, Player, VoiceSpec};
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index fd981595..904b1045 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (video seek frame-loss race fixed, upstream #416; previous: major, created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -20,7 +20,7 @@ ready** (estimated), **10–16 h** to parity.
 | Step clock: a click after a long pause plays its step (#11) | yes | yes | |
 | Hidden slides skipped | yes | yes | |
 | Hyperlinks and action settings followed (slides, web, mail, End Show, Last Viewed) | yes | yes | Only `http(s)` and `mailto` open outside the show, by design (`safe_url`) |
-| Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable |
+| Media playback with controls, play across slides, full-screen video | yes | yes | Seeks and loops preserve new-generation video frames and end-of-stream; queue regression and repeated seeks across H.264/HEVC/VP9/AV1 in `crates/media`. WMA/WMV not decodable |
 | Animated GIFs play; pause from their corner button | yes | yes (#39) | |
 | See All Slides grid during the show | yes | no | |
 | Zoom into part of a slide during the show | yes | no | |
@@ -73,4 +73,5 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Video seek handoff no longer discards freshly decoded frames or end-of-stream (upstream #416); deterministic queue and four-codec seek regression tests |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |

From bba398f60f4ac3ea23e81f1a3998d5d2ec4c79d4 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:25:38 +0300
Subject: [PATCH 198/376] Add the Handout Master view
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

View ▸ Handout Master opens the handout master (creating one with header,
date, footer and page-number placeholders if the deck has none) on a page
at the notes size, with a dashed preview of where 1-9 slides go. Its
contextual tab toggles the placeholders, sets the background and closes
the view. Stacked on #533, which reads and writes the handout master.
---
 crates/engine/src/cmd/design.rs | 110 +++++++++++++++++++++++++++++++-
 crates/engine/src/cmd/mod.rs    |   2 +
 crates/engine/src/cmd/text.rs   |   1 +
 crates/engine/src/lib.rs        |  22 +++++++
 crates/engine/src/tests.rs      |  38 +++++++++++
 crates/ui-egui/src/canvas.rs    |  22 ++++++-
 crates/ui-egui/src/lib.rs       |   3 +
 crates/ui-egui/src/menus.rs     |   1 +
 crates/ui-egui/src/ribbon.rs    |  51 ++++++++++++++-
 crates/ui-egui/src/thumbs.rs    |   4 ++
 docs/gaps.md                    |   8 ++-
 11 files changed, 254 insertions(+), 8 deletions(-)

diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..be051b18 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -47,6 +47,24 @@ pub fn specs() -> Vec<CommandSpec> {
             header_footer
         ),
         cmd!(noundo "view.slideMaster", "Slide Master", ["View", "Master Views"], None, "{master?: index, layout?: index}", has_doc, master_view),
+        cmd!(
+            "view.handoutMaster",
+            "Handout Master",
+            ["View", "Master Views"],
+            None,
+            "{} (creates the handout master with header, date, footer and page number if the deck has none)",
+            has_doc,
+            handout_view
+        ),
+        cmd!(
+            "handout.placeholders",
+            "Handout Placeholders",
+            ["Handout Master", "Placeholders"],
+            None,
+            "{header?: bool, date?: bool, footer?: bool, pageNumber?: bool} (show or hide each)",
+            in_handout,
+            handout_placeholders
+        ),
         cmd!(noundo "view.closeMaster", "Close Master View", ["Slide Master", "Close"], None, "{}", has_doc, close_master),
         cmd!("master.insertLayout", "Insert Layout", ["Slide Master", "Edit Master"], None, "{name?}", has_doc, insert_layout),
         cmd!("master.renameLayout", "Rename Layout", ["Slide Master", "Edit Master"], None, "{name, master?, layout?}", has_doc, rename_layout),
@@ -82,7 +100,9 @@ fn theme(s: &mut Session, p: &Value) -> Result<Value> {
 fn master_index(doc: &Presentation, sel: &crate::Selection) -> usize {
     match sel.target {
         Target::Master { master } | Target::Layout { master, .. } => master,
-        Target::Slides => doc.slides.get(sel.slide).and_then(|s| doc.masters.iter().position(|m| m.layout(s.layout).is_some())).unwrap_or(0),
+        Target::Slides | Target::Handout => {
+            doc.slides.get(sel.slide).and_then(|s| doc.masters.iter().position(|m| m.layout(s.layout).is_some())).unwrap_or(0)
+        }
     }
 }
 
@@ -196,6 +216,11 @@ fn background(s: &mut Session, p: &Value) -> Result<Value> {
                     l.background = bg.clone();
                 }
             }
+            Target::Handout => {
+                if let Some(m) = doc.handout_master.as_mut() {
+                    Arc::make_mut(m).background = bg.clone();
+                }
+            }
             Target::Slides => {
                 let list: Vec<usize> = if all { (0..doc.slides.len()).collect() } else { vec![index.unwrap_or(sel.slide)] };
                 for i in list {
@@ -446,6 +471,89 @@ fn master_view(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(serde_json::to_value(target).unwrap_or_default())
 }
 
+fn in_handout(s: &Session) -> std::result::Result<(), String> {
+    if s.active().is_some_and(|d| d.selection.target == Target::Handout) { Ok(()) } else { Err("open View ▸ Handout Master first".into()) }
+}
+
+/// The four handout-master placeholders PowerPoint offers, in a page of `size`.
+pub fn handout_placeholder(kind: PhType, size: Size, id: ShapeId) -> Shape {
+    let (w, h) = (size.width, size.height);
+    let (name, idx, x, y) = match kind {
+        PhType::Header => ("Header Placeholder", 0, 0.0, 0.0),
+        PhType::Date => ("Date Placeholder", 1, w * 0.57, 0.0),
+        PhType::Footer => ("Footer Placeholder", 2, 0.0, h * 0.95),
+        _ => ("Slide Number Placeholder", 3, w * 0.57, h * 0.95),
+    };
+    let mut text = TextBody::default();
+    if let Some(p) = text.paragraphs.first_mut()
+        && matches!(kind, PhType::Date | PhType::SlideNum)
+    {
+        p.props.align = Some(deckcraft_model::text::Align::Right);
+    }
+    Shape {
+        id,
+        name: format!("{name} {}", idx + 1),
+        xfrm: Some(deckcraft_geom::Xfrm::new(x, y, w * 0.43, h * 0.05)),
+        ph: Some(deckcraft_model::Placeholder { kind, idx, size: Some("quarter".into()), ..Default::default() }),
+        text: Some(text),
+        ..Default::default()
+    }
+}
+
+const HANDOUT_KINDS: [(&str, PhType); 4] =
+    [("header", PhType::Header), ("date", PhType::Date), ("footer", PhType::Footer), ("pageNumber", PhType::SlideNum)];
+
+fn handout_view(s: &mut Session, _p: &Value) -> Result<Value> {
+    let created = s.doc()?.doc.handout_master.is_none();
+    if created {
+        s.edit(|doc, _| {
+            let mut m = deckcraft_model::Master {
+                name: "Handout Master".into(),
+                theme: doc.masters.first().map(|m| m.theme.clone()).unwrap_or_default(),
+                color_map: doc.masters.first().map(|m| m.color_map.clone()).unwrap_or_default(),
+                ..Default::default()
+            };
+            let size = doc.notes_size;
+            for (_, k) in HANDOUT_KINDS {
+                let id = ShapeId(doc.alloc_id());
+                m.shapes.push(handout_placeholder(k, size, id));
+            }
+            doc.handout_master = Some(Arc::new(m));
+            Ok(())
+        })?;
+    }
+    s.select(|_, sel| {
+        sel.target = Target::Handout;
+        sel.shapes.clear();
+        sel.text = None;
+    })?;
+    Ok(json!({"created": created}))
+}
+
+fn handout_placeholders(s: &mut Session, p: &Value) -> Result<Value> {
+    s.edit(|doc, _| {
+        let size = doc.notes_size;
+        let mut ids = vec![];
+        for (key, _) in HANDOUT_KINDS {
+            ids.push(p.get(key).and_then(Value::as_bool).map(|_| ShapeId(doc.alloc_id())));
+        }
+        let m = Arc::make_mut(doc.handout_master.as_mut().ok_or_else(|| bad("handout.placeholders", "no handout master"))?);
+        for ((key, kind), id) in HANDOUT_KINDS.into_iter().zip(ids) {
+            let (Some(on), Some(id)) = (p.get(key).and_then(Value::as_bool), id) else { continue };
+            let has = m.shapes.iter().any(|x| x.ph_type() == Some(kind));
+            if on && !has {
+                m.shapes.push(handout_placeholder(kind, size, id));
+            } else if !on {
+                m.shapes.retain(|x| x.ph_type() != Some(kind));
+            }
+        }
+        Ok(())
+    })?;
+    let m = s.doc()?.doc.handout_master.clone();
+    let shown = |k: PhType| m.as_ref().is_some_and(|m| m.shapes.iter().any(|x| x.ph_type() == Some(k)));
+    Ok(json!({"header": shown(PhType::Header), "date": shown(PhType::Date), "footer": shown(PhType::Footer), "pageNumber": shown(PhType::SlideNum)}))
+}
+
 fn close_master(s: &mut Session, _p: &Value) -> Result<Value> {
     s.select(|_, sel| {
         sel.target = Target::Slides;
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..7864f0fa 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -274,6 +274,7 @@ fn ctx_xfrm(doc: &deckcraft_model::Presentation, sel: &crate::Selection, shape:
     match sel.target {
         crate::Target::Slides => doc.slides.get(sel.slide).and_then(|s| Ctx::for_slide(doc, s)).map(|c| resolve::xfrm(&c, shape)),
         crate::Target::Master { master } => doc.masters.get(master).map(|m| resolve::xfrm(&Ctx::for_master(doc, m), shape)),
+        crate::Target::Handout => doc.handout_master.as_ref().map(|m| resolve::xfrm(&Ctx::for_master(doc, m), shape)),
         crate::Target::Layout { master, layout } => {
             doc.masters.get(master).and_then(|m| m.layouts.get(layout).map(|l| resolve::xfrm(&Ctx::for_layout(doc, m, l), shape)))
         }
@@ -327,6 +328,7 @@ pub(crate) fn current_shapes<'a>(doc: &'a deckcraft_model::Presentation, sel: &c
     match sel.target {
         crate::Target::Slides => doc.slides.get(sel.slide).map(|s| &s.shapes),
         crate::Target::Master { master } => doc.masters.get(master).map(|m| &m.shapes),
+        crate::Target::Handout => doc.handout_master.as_ref().map(|m| &m.shapes),
         crate::Target::Layout { master, layout } => doc.masters.get(master).and_then(|m| m.layouts.get(layout)).map(|l| &l.shapes),
     }
 }
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..2d642f1d 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -153,6 +153,7 @@ pub(crate) fn ctx_for<'a>(doc: &'a Presentation, sel: &Selection) -> Option<Ctx<
     match sel.target {
         Target::Slides => doc.slides.get(sel.slide).and_then(|s| Ctx::for_slide(doc, s)),
         Target::Master { master } => doc.masters.get(master).map(|m| Ctx::for_master(doc, m)),
+        Target::Handout => doc.handout_master.as_ref().map(|m| Ctx::for_master(doc, m)),
         Target::Layout { master, layout } => doc.masters.get(master).and_then(|m| m.layouts.get(layout).map(|l| Ctx::for_layout(doc, m, l))),
     }
 }
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..51d0460a 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -27,6 +27,7 @@ pub use cmd::{CommandInfo, CommandSpec, command_specs, find_command};
 pub use deckcraft_geom as geom;
 pub use deckcraft_media as media;
 pub use deckcraft_model as model;
+pub use deckcraft_pdf as pdf;
 pub use deckcraft_render as render;
 pub use tools::{Mods, PointerEvent, PointerKind, ToolKind};
 
@@ -100,6 +101,8 @@ pub enum Target {
         master: usize,
         layout: usize,
     },
+    /// The handout master (View ▸ Handout Master), a page at the notes size.
+    Handout,
 }
 
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
@@ -212,6 +215,7 @@ impl DocState {
         match self.selection.target {
             Target::Slides => self.current_slide().map(|s| s.shapes.as_slice()).unwrap_or(&[]),
             Target::Master { master } => self.doc.masters.get(master).map(|m| m.shapes.as_slice()).unwrap_or(&[]),
+            Target::Handout => self.doc.handout_master.as_ref().map(|m| m.shapes.as_slice()).unwrap_or(&[]),
             Target::Layout { master, layout } => {
                 self.doc.masters.get(master).and_then(|m| m.layouts.get(layout)).map(|l| l.shapes.as_slice()).unwrap_or(&[])
             }
@@ -225,11 +229,28 @@ impl DocState {
     }
 }
 
+/// The page being edited: the slide size, or the notes size in Handout Master view.
+pub fn page_size(st: &DocState) -> deckcraft_geom::Size {
+    if st.selection.target == Target::Handout { st.doc.notes_size } else { st.doc.slide_size }
+}
+
+/// The handout master as a one-master presentation at the handout page size, for drawing it with
+/// the layout renderer.
+pub fn handout_page(doc: &Presentation) -> Option<Presentation> {
+    let m = doc.handout_master.clone()?;
+    let mut p = doc.clone();
+    p.slide_size = doc.notes_size;
+    p.masters = vec![m];
+    p.slides.clear();
+    Some(p)
+}
+
 /// Mutable access to the edited shape tree of a presentation.
 pub fn shapes_mut<'a>(doc: &'a mut Presentation, sel: &Selection) -> Option<&'a mut Vec<Shape>> {
     match sel.target {
         Target::Slides => doc.slides.get_mut(sel.slide).map(|s| &mut Arc::make_mut(s).shapes),
         Target::Master { master } => doc.masters.get_mut(master).map(|m| &mut Arc::make_mut(m).shapes),
+        Target::Handout => doc.handout_master.as_mut().map(|m| &mut Arc::make_mut(m).shapes),
         Target::Layout { master, layout } => {
             doc.masters.get_mut(master).and_then(|m| Arc::make_mut(m).layouts.get_mut(layout)).map(|l| &mut l.shapes)
         }
@@ -536,6 +557,7 @@ fn clamp_selection(st: &mut DocState) {
     st.selection.slides = slides;
     match st.selection.target {
         Target::Master { master } if master >= st.doc.masters.len() => st.selection.target = Target::Slides,
+        Target::Handout if st.doc.handout_master.is_none() => st.selection.target = Target::Slides,
         Target::Layout { master, layout } if st.doc.masters.get(master).is_none_or(|m| layout >= m.layouts.len()) => {
             st.selection.target = Target::Slides
         }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..e5c06297 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,41 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn handout_master_view_edits_and_round_trips() {
+    use deckcraft_model::PhType;
+    let mut s = Session::with_new();
+    assert!(s.doc().unwrap().doc.handout_master.is_none());
+    assert!(s.execute("handout.placeholders", &json!({"footer": false})).is_err(), "only in the view");
+    let r = s.execute("view.handoutMaster", &json!({})).unwrap();
+    assert_eq!(r["created"], true);
+    let st = s.doc().unwrap();
+    assert_eq!(st.selection.target, Target::Handout);
+    assert_eq!(crate::page_size(st), st.doc.notes_size);
+    let kinds: Vec<_> = st.shapes().iter().filter_map(|x| x.ph_type()).collect();
+    assert_eq!(kinds, [PhType::Header, PhType::Date, PhType::Footer, PhType::SlideNum]);
+    // Hide the footer, then show it again; undo restores the hidden state.
+    let r = s.execute("handout.placeholders", &json!({"footer": false})).unwrap();
+    assert_eq!(r["footer"], false);
+    assert_eq!(s.doc().unwrap().shapes().len(), 3);
+    s.execute("handout.placeholders", &json!({"footer": true})).unwrap();
+    assert_eq!(s.doc().unwrap().shapes().len(), 4);
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.doc().unwrap().shapes().len(), 3);
+    // Shapes drawn in the view land on the handout master, not the slide.
+    let slide_shapes = s.doc().unwrap().doc.slides[0].shapes.len();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [20, 300, 100, 40]})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.handout_master.as_ref().unwrap().shapes.len(), 4);
+    assert_eq!(s.doc().unwrap().doc.slides[0].shapes.len(), slide_shapes);
+    assert!(crate::handout_page(&s.doc().unwrap().doc).is_some_and(|p| p.masters.len() == 1 && p.slide_size == p.notes_size));
+    s.execute("view.closeMaster", &json!({})).unwrap();
+    assert_eq!(s.doc().unwrap().selection.target, Target::Slides);
+    // Reopening doesn't make a second master, and it survives PPTX.
+    assert_eq!(s.execute("view.handoutMaster", &json!({})).unwrap()["created"], false);
+    let bytes = deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap();
+    let back = deckcraft_pptx::import(&bytes).unwrap();
+    let hm = back.handout_master.expect("handout master kept");
+    assert_eq!(hm.shapes.len(), 4);
+    assert!(hm.shapes.iter().any(|x| x.ph_type() == Some(PhType::SlideNum)));
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..5e9a7aa8 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -38,7 +38,8 @@ fn mods(ui: &Ui) -> Mods {
 /// The slide's rect on screen for the current zoom.
 pub fn layout(app: &SlideApp, avail: Rect) -> (Rect, f32) {
     let Some(d) = app.session.active() else { return (avail, 1.0) };
-    let (sw, sh) = (d.doc.slide_size.width as f32, d.doc.slide_size.height as f32);
+    let page = deckcraft_engine::page_size(d);
+    let (sw, sh) = (page.width as f32, page.height as f32);
     let margin = 28.0;
     let fit = ((avail.width() - margin * 2.0) / sw).min((avail.height() - margin * 2.0) / sh).max(0.05);
     let scale = app.ui.zoom.unwrap_or(fit);
@@ -123,6 +124,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
         }
         Some((Target::Master { master }, d)) => master_tex(ui.ctx(), &d.doc, master, None, px, visible),
         Some((Target::Layout { master, layout }, d)) => master_tex(ui.ctx(), &d.doc, master, Some(layout), px, visible),
+        Some((Target::Handout, d)) => deckcraft_engine::handout_page(&d.doc).and_then(|p| master_tex(ui.ctx(), &p, 0, None, px, visible)),
         None => None,
     };
     if let Some((tex, region)) = tex {
@@ -135,6 +137,24 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     }
     app.perf.render_ms = app.textures.last_render_ms;
     media_frames(app, &painter, xf);
+    if let Some(d) = app.session.active().filter(|d| d.selection.target == Target::Handout) {
+        // Where the slides go on a printed handout, as in PowerPoint's preview.
+        let (n, s) = (d.doc.notes_size, d.doc.slide_size);
+        let aspect = s.width / s.height.max(1.0);
+        for b in deckcraft_engine::pdf::handout_boxes(app.ui.handout_per_page, (n.width, n.height), aspect) {
+            let r = Rect::from_min_max(
+                pos2(slide_rect.min.x + b.x0 as f32 * scale, slide_rect.min.y + b.y0 as f32 * scale),
+                pos2(slide_rect.min.x + b.x1 as f32 * scale, slide_rect.min.y + b.y1 as f32 * scale),
+            );
+            let dash = egui::Shape::dashed_line(
+                &[r.left_top(), r.right_top(), r.right_bottom(), r.left_bottom(), r.left_top()],
+                Stroke::new(1.0, Color32::from_gray(140)),
+                4.0,
+                3.0,
+            );
+            painter.extend(dash);
+        }
+    }
     if app.ui.gridlines {
         let step = 72.0 / 2.0 * scale;
         let mut x = slide_rect.min.x + step;
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..c746c31a 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -91,6 +91,8 @@ pub struct UiState {
     pub pane_width: f32,
     pub ruler: bool,
     pub gridlines: bool,
+    /// Slides per page previewed in Handout Master view (1, 2, 3, 4, 6 or 9).
+    pub handout_per_page: u8,
     pub guides: bool,
     pub smart_guides: bool,
     /// None = fit to window.
@@ -118,6 +120,7 @@ impl Default for UiState {
             pane_width: 300.0,
             ruler: false,
             gridlines: false,
+            handout_per_page: 6,
             guides: false,
             smart_guides: true,
             zoom: None,
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..b251a2f1 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -190,6 +190,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Slide Show", "show.start"),
                 ("-", ""),
                 ("Slide Master", "view.slideMaster"),
+                ("Handout Master", "view.handoutMaster"),
                 ("-", ""),
                 ("Ruler", "view.ruler"),
                 ("Gridlines", "view.gridlines"),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..ee5c3391 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -106,7 +106,9 @@ pub fn title_bar(app: &mut SlideApp, ui: &mut Ui) {
 fn contextual(app: &SlideApp) -> Vec<&'static str> {
     let mut v = vec![];
     let Some(st) = app.session.active() else { return v };
-    if st.selection.target != Target::Slides {
+    if st.selection.target == Target::Handout {
+        v.push("Handout Master");
+    } else if st.selection.target != Target::Slides {
         v.push("Slide Master");
     }
     let shapes = st.selected_shapes();
@@ -222,6 +224,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
             "Chart Design" => chart_design(app, ui),
             "Playback" => playback(app, ui),
             "Slide Master" => slide_master(app, ui),
+            "Handout Master" => handout_master(app, ui),
             _ => {}
         }
     });
@@ -1822,8 +1825,10 @@ fn view(app: &mut SlideApp, ui: &mut Ui) {
         if big_button_ex(ui, Icon::SlideMaster, "Slide\nMaster", true, false, in_master).0.clicked() {
             let _ = app.run(if in_master { "view.closeMaster" } else { "view.slideMaster" }, json!({}));
         }
-        let r = big_button(ui, Icon::HandoutMaster, "Handout\nMaster", false);
-        let _ = r.on_hover_text("Handout Master (coming soon)");
+        let in_handout = app.session.active().is_some_and(|d| d.selection.target == Target::Handout);
+        if big_button_ex(ui, Icon::HandoutMaster, "Handout\nMaster", true, false, in_handout).0.clicked() {
+            let _ = app.run(if in_handout { "view.closeMaster" } else { "view.handoutMaster" }, json!({}));
+        }
         let r = big_button(ui, Icon::NotesMaster, "Notes\nMaster", false);
         let _ = r.on_hover_text("Notes Master (coming soon)");
     });
@@ -2408,6 +2413,46 @@ fn slide_master(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+fn handout_master(app: &mut SlideApp, ui: &mut Ui) {
+    group(ui, |ui| {
+        let r = big_button(ui, Icon::Layout, &format!("Slides Per\nPage: {}", app.ui.handout_per_page), true);
+        egui::Popup::menu(&r).show(|ui| {
+            for n in [1u8, 2, 3, 4, 6, 9] {
+                if ui.selectable_label(app.ui.handout_per_page == n, format!("{n} Slide{}", if n == 1 { "" } else { "s" })).clicked() {
+                    app.ui.handout_per_page = n;
+                }
+            }
+        });
+    });
+    group(ui, |ui| {
+        let shown = |app: &SlideApp, k: deckcraft_model::PhType| {
+            app.session.active().and_then(|d| d.doc.handout_master.as_ref()).is_some_and(|m| m.shapes.iter().any(|s| s.ph_type() == Some(k)))
+        };
+        rows(ui, |ui| {
+            use deckcraft_model::PhType;
+            for (label, key, k) in [
+                ("Header", "header", PhType::Header),
+                ("Date", "date", PhType::Date),
+                ("Footer", "footer", PhType::Footer),
+                ("Page Number", "pageNumber", PhType::SlideNum),
+            ] {
+                let mut on = shown(app, k);
+                if ui.checkbox(&mut on, label).changed() {
+                    run(app, "handout.placeholders", json!({ key: on }));
+                }
+            }
+        });
+    });
+    group(ui, |ui| {
+        big(app, ui, Icon::FormatBackground, "Background\nStyles", "view.pane", json!({"pane": "background"}));
+    });
+    group(ui, |ui| {
+        if big_button(ui, Icon::Close, "Close\nMaster View", true).clicked() {
+            run(app, "view.closeMaster", json!({}));
+        }
+    });
+}
+
 /// Gallery glyphs for the freeform tools: a wave (curve), a polygon (freeform), a squiggle (scribble).
 fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     let at = |x: f32, y: f32| egui::pos2(r.min.x + x * r.width(), r.min.y + y * r.height());
diff --git a/crates/ui-egui/src/thumbs.rs b/crates/ui-egui/src/thumbs.rs
index ebdc81d0..2fbc43db 100644
--- a/crates/ui-egui/src/thumbs.rs
+++ b/crates/ui-egui/src/thumbs.rs
@@ -11,6 +11,10 @@ use crate::theme::{self, Tokens};
 pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
     let in_master = app.session.active().is_some_and(|d| d.selection.target != Target::Slides);
+    // Handout Master view has one page and no thumbnails, as in PowerPoint.
+    if app.session.active().is_some_and(|d| d.selection.target == Target::Handout) {
+        return;
+    }
     egui::Panel::left("thumbs")
         .resizable(true)
         .default_size(app.ui.thumbs_width)
diff --git a/docs/gaps.md b/docs/gaps.md
index 40a27c9a..e440b77a 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -161,9 +161,10 @@ Detail in [file-format-parity.md](file-format-parity.md).
 Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a **beta blocker**.
 
 ### Notes and Handout masters
-- **Evidence:** checklist row missing the editing view. PPTX writes a notes master, and a handout
-  master's header, footer, date and slide number are kept. There is no view to edit either master.
-- **Estimate:** 4–6 h.
+- **Evidence:** View ▸ Handout Master edits the handout master (header, date, footer and page
+  number placeholders, background, slides-per-page preview) and PPTX keeps it. There's no Notes
+  Master view yet, and PDF handouts don't use the handout master's text.
+- **Estimate:** 2–3 h (Notes Master view), 1 h (handout text in PDF).
 
 ### Edit points, text warp, 3-D
 - **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
@@ -257,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Handout Master view: the masters gap is now the Notes Master view and handout text in PDF |
 | 2026-10-13 | minor | Owned PPTX corpus for tables, charts, animations, media, sections and masters. Handout-master text is kept; the corpus gap is now a larger set and PowerPoint reference renders |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |

From 443fe300d0b167816b90eb7de6fccee18979c5ca Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:31:14 +0300
Subject: [PATCH 199/376] Add the Notes Master view
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

View ▸ Notes Master edits the notes master on a notes-size page (creating
PowerPoint's default placeholders if the deck has none); its tab toggles
header, date, slide image, body, footer and page number, sets the
background and closes the view. The PPTX writer now writes an edited
notes master as it is, even in a deck without notes. Stacked on #572.
---
 crates/engine/src/cmd/design.rs | 128 +++++++++++++++++++++++++++++++-
 crates/engine/src/cmd/mod.rs    |   6 +-
 crates/engine/src/cmd/text.rs   |   2 +-
 crates/engine/src/lib.rs        |  42 +++++++++--
 crates/engine/src/tests.rs      |  32 +++++++-
 crates/pptx/src/write/mod.rs    |  16 +++-
 crates/ui-egui/src/canvas.rs    |   4 +-
 crates/ui-egui/src/menus.rs     |   1 +
 crates/ui-egui/src/ribbon.rs    |  39 +++++++++-
 crates/ui-egui/src/thumbs.rs    |   2 +-
 docs/gaps.md                    |  10 ++-
 11 files changed, 256 insertions(+), 26 deletions(-)

diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index be051b18..b258a5f9 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -65,6 +65,24 @@ pub fn specs() -> Vec<CommandSpec> {
             in_handout,
             handout_placeholders
         ),
+        cmd!(
+            "view.notesMaster",
+            "Notes Master",
+            ["View", "Master Views"],
+            None,
+            "{} (creates the notes master with header, date, slide image, notes body, footer and page number if the deck has none)",
+            has_doc,
+            notes_view
+        ),
+        cmd!(
+            "notes.placeholders",
+            "Notes Placeholders",
+            ["Notes Master", "Placeholders"],
+            None,
+            "{header?, date?, slideImage?, body?, footer?, pageNumber?: bool} (show or hide each)",
+            in_notes_master,
+            notes_placeholders
+        ),
         cmd!(noundo "view.closeMaster", "Close Master View", ["Slide Master", "Close"], None, "{}", has_doc, close_master),
         cmd!("master.insertLayout", "Insert Layout", ["Slide Master", "Edit Master"], None, "{name?}", has_doc, insert_layout),
         cmd!("master.renameLayout", "Rename Layout", ["Slide Master", "Edit Master"], None, "{name, master?, layout?}", has_doc, rename_layout),
@@ -100,7 +118,7 @@ fn theme(s: &mut Session, p: &Value) -> Result<Value> {
 fn master_index(doc: &Presentation, sel: &crate::Selection) -> usize {
     match sel.target {
         Target::Master { master } | Target::Layout { master, .. } => master,
-        Target::Slides | Target::Handout => {
+        Target::Slides | Target::Handout | Target::NotesMaster => {
             doc.slides.get(sel.slide).and_then(|s| doc.masters.iter().position(|m| m.layout(s.layout).is_some())).unwrap_or(0)
         }
     }
@@ -216,8 +234,8 @@ fn background(s: &mut Session, p: &Value) -> Result<Value> {
                     l.background = bg.clone();
                 }
             }
-            Target::Handout => {
-                if let Some(m) = doc.handout_master.as_mut() {
+            t @ (Target::Handout | Target::NotesMaster) => {
+                if let Some(m) = crate::page_master_mut(doc, t) {
                     Arc::make_mut(m).background = bg.clone();
                 }
             }
@@ -554,6 +572,110 @@ fn handout_placeholders(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"header": shown(PhType::Header), "date": shown(PhType::Date), "footer": shown(PhType::Footer), "pageNumber": shown(PhType::SlideNum)}))
 }
 
+fn in_notes_master(s: &Session) -> std::result::Result<(), String> {
+    if s.active().is_some_and(|d| d.selection.target == Target::NotesMaster) { Ok(()) } else { Err("open View ▸ Notes Master first".into()) }
+}
+
+const NOTES_KINDS: [(&str, PhType); 6] = [
+    ("header", PhType::Header),
+    ("date", PhType::Date),
+    ("slideImage", PhType::SlideImage),
+    ("body", PhType::Body),
+    ("footer", PhType::Footer),
+    ("pageNumber", PhType::SlideNum),
+];
+
+/// A notes-master placeholder in a page of `size`, laid out as PowerPoint's default notes master.
+pub fn notes_placeholder(kind: PhType, size: Size, id: ShapeId) -> Shape {
+    let (w, h) = (size.width, size.height);
+    match kind {
+        PhType::SlideImage => Shape {
+            id,
+            name: "Slide Image Placeholder 3".into(),
+            xfrm: Some(deckcraft_geom::Xfrm::new(w * 0.125, h * 0.125, w * 0.75, h * 0.375)),
+            ph: Some(deckcraft_model::Placeholder { kind, idx: 2, ..Default::default() }),
+            fill: Some(Fill::None),
+            line: Some(deckcraft_model::Line::solid(deckcraft_model::ColorRef::rgb(deckcraft_color::Rgba::BLACK), 1.0)),
+            ..Default::default()
+        },
+        PhType::Body => {
+            let mut text = TextBody::default();
+            text.paragraphs = vec![deckcraft_model::text::Paragraph::new("Click to edit Master text styles")];
+            Shape {
+                id,
+                name: "Notes Placeholder 4".into(),
+                xfrm: Some(deckcraft_geom::Xfrm::new(w * 0.1, h * 0.53, w * 0.8, h * 0.36)),
+                ph: Some(deckcraft_model::Placeholder { kind, idx: 3, size: Some("quarter".into()), ..Default::default() }),
+                text: Some(text),
+                ..Default::default()
+            }
+        }
+        _ => {
+            let mut s = handout_placeholder(kind, size, id);
+            if let Some(ph) = s.ph.as_mut() {
+                ph.idx = match kind {
+                    PhType::Header => 0,
+                    PhType::Date => 1,
+                    PhType::Footer => 4,
+                    _ => 5,
+                };
+            }
+            s
+        }
+    }
+}
+
+fn notes_view(s: &mut Session, _p: &Value) -> Result<Value> {
+    let created = s.doc()?.doc.notes_master.as_ref().is_none_or(|m| m.shapes.is_empty());
+    if created {
+        s.edit(|doc, _| {
+            let mut m = doc.notes_master.as_deref().cloned().unwrap_or_else(|| deckcraft_model::Master {
+                name: "Notes Master".into(),
+                theme: doc.masters.first().map(|m| m.theme.clone()).unwrap_or_default(),
+                color_map: doc.masters.first().map(|m| m.color_map.clone()).unwrap_or_default(),
+                ..Default::default()
+            });
+            let size = doc.notes_size;
+            for (_, k) in NOTES_KINDS {
+                let id = ShapeId(doc.alloc_id());
+                m.shapes.push(notes_placeholder(k, size, id));
+            }
+            doc.notes_master = Some(Arc::new(m));
+            Ok(())
+        })?;
+    }
+    s.select(|_, sel| {
+        sel.target = Target::NotesMaster;
+        sel.shapes.clear();
+        sel.text = None;
+    })?;
+    Ok(json!({"created": created}))
+}
+
+fn notes_placeholders(s: &mut Session, p: &Value) -> Result<Value> {
+    s.edit(|doc, _| {
+        let size = doc.notes_size;
+        let ids: Vec<ShapeId> = NOTES_KINDS.iter().map(|_| ShapeId(doc.alloc_id())).collect();
+        let m = Arc::make_mut(doc.notes_master.as_mut().ok_or_else(|| bad("notes.placeholders", "no notes master"))?);
+        for ((key, kind), id) in NOTES_KINDS.into_iter().zip(ids) {
+            let Some(on) = p.get(key).and_then(Value::as_bool) else { continue };
+            let has = m.shapes.iter().any(|x| x.ph_type() == Some(kind));
+            if on && !has {
+                m.shapes.push(notes_placeholder(kind, size, id));
+            } else if !on {
+                m.shapes.retain(|x| x.ph_type() != Some(kind));
+            }
+        }
+        Ok(())
+    })?;
+    let m = s.doc()?.doc.notes_master.clone();
+    let mut out = serde_json::Map::new();
+    for (key, kind) in NOTES_KINDS {
+        out.insert(key.into(), json!(m.as_ref().is_some_and(|m| m.shapes.iter().any(|x| x.ph_type() == Some(kind)))));
+    }
+    Ok(Value::Object(out))
+}
+
 fn close_master(s: &mut Session, _p: &Value) -> Result<Value> {
     s.select(|_, sel| {
         sel.target = Target::Slides;
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index 7864f0fa..ce482ddf 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -274,7 +274,9 @@ fn ctx_xfrm(doc: &deckcraft_model::Presentation, sel: &crate::Selection, shape:
     match sel.target {
         crate::Target::Slides => doc.slides.get(sel.slide).and_then(|s| Ctx::for_slide(doc, s)).map(|c| resolve::xfrm(&c, shape)),
         crate::Target::Master { master } => doc.masters.get(master).map(|m| resolve::xfrm(&Ctx::for_master(doc, m), shape)),
-        crate::Target::Handout => doc.handout_master.as_ref().map(|m| resolve::xfrm(&Ctx::for_master(doc, m), shape)),
+        t @ (crate::Target::Handout | crate::Target::NotesMaster) => {
+            crate::page_master(doc, t).map(|m| resolve::xfrm(&Ctx::for_master(doc, m), shape))
+        }
         crate::Target::Layout { master, layout } => {
             doc.masters.get(master).and_then(|m| m.layouts.get(layout).map(|l| resolve::xfrm(&Ctx::for_layout(doc, m, l), shape)))
         }
@@ -328,7 +330,7 @@ pub(crate) fn current_shapes<'a>(doc: &'a deckcraft_model::Presentation, sel: &c
     match sel.target {
         crate::Target::Slides => doc.slides.get(sel.slide).map(|s| &s.shapes),
         crate::Target::Master { master } => doc.masters.get(master).map(|m| &m.shapes),
-        crate::Target::Handout => doc.handout_master.as_ref().map(|m| &m.shapes),
+        t @ (crate::Target::Handout | crate::Target::NotesMaster) => crate::page_master(doc, t).map(|m| &m.shapes),
         crate::Target::Layout { master, layout } => doc.masters.get(master).and_then(|m| m.layouts.get(layout)).map(|l| &l.shapes),
     }
 }
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 2d642f1d..f644481a 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -153,7 +153,7 @@ pub(crate) fn ctx_for<'a>(doc: &'a Presentation, sel: &Selection) -> Option<Ctx<
     match sel.target {
         Target::Slides => doc.slides.get(sel.slide).and_then(|s| Ctx::for_slide(doc, s)),
         Target::Master { master } => doc.masters.get(master).map(|m| Ctx::for_master(doc, m)),
-        Target::Handout => doc.handout_master.as_ref().map(|m| Ctx::for_master(doc, m)),
+        t @ (Target::Handout | Target::NotesMaster) => crate::page_master(doc, t).map(|m| Ctx::for_master(doc, m)),
         Target::Layout { master, layout } => doc.masters.get(master).and_then(|m| m.layouts.get(layout).map(|l| Ctx::for_layout(doc, m, l))),
     }
 }
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index 51d0460a..63b435e7 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -103,6 +103,32 @@ pub enum Target {
     },
     /// The handout master (View ▸ Handout Master), a page at the notes size.
     Handout,
+    /// The notes master (View ▸ Notes Master), a page at the notes size.
+    NotesMaster,
+}
+
+impl Target {
+    /// A notes-size master page (Handout or Notes Master view).
+    pub fn is_page_master(self) -> bool {
+        matches!(self, Target::Handout | Target::NotesMaster)
+    }
+}
+
+/// The handout or notes master edited in that view.
+pub fn page_master(doc: &Presentation, t: Target) -> Option<&Arc<deckcraft_model::Master>> {
+    match t {
+        Target::Handout => doc.handout_master.as_ref(),
+        Target::NotesMaster => doc.notes_master.as_ref(),
+        _ => None,
+    }
+}
+
+pub fn page_master_mut(doc: &mut Presentation, t: Target) -> Option<&mut Arc<deckcraft_model::Master>> {
+    match t {
+        Target::Handout => doc.handout_master.as_mut(),
+        Target::NotesMaster => doc.notes_master.as_mut(),
+        _ => None,
+    }
 }
 
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
@@ -215,7 +241,7 @@ impl DocState {
         match self.selection.target {
             Target::Slides => self.current_slide().map(|s| s.shapes.as_slice()).unwrap_or(&[]),
             Target::Master { master } => self.doc.masters.get(master).map(|m| m.shapes.as_slice()).unwrap_or(&[]),
-            Target::Handout => self.doc.handout_master.as_ref().map(|m| m.shapes.as_slice()).unwrap_or(&[]),
+            Target::Handout | Target::NotesMaster => page_master(&self.doc, self.selection.target).map(|m| m.shapes.as_slice()).unwrap_or(&[]),
             Target::Layout { master, layout } => {
                 self.doc.masters.get(master).and_then(|m| m.layouts.get(layout)).map(|l| l.shapes.as_slice()).unwrap_or(&[])
             }
@@ -231,13 +257,13 @@ impl DocState {
 
 /// The page being edited: the slide size, or the notes size in Handout Master view.
 pub fn page_size(st: &DocState) -> deckcraft_geom::Size {
-    if st.selection.target == Target::Handout { st.doc.notes_size } else { st.doc.slide_size }
+    if st.selection.target.is_page_master() { st.doc.notes_size } else { st.doc.slide_size }
 }
 
-/// The handout master as a one-master presentation at the handout page size, for drawing it with
-/// the layout renderer.
-pub fn handout_page(doc: &Presentation) -> Option<Presentation> {
-    let m = doc.handout_master.clone()?;
+/// The handout or notes master as a one-master presentation at the notes page size, for drawing
+/// it with the layout renderer.
+pub fn master_page(doc: &Presentation, t: Target) -> Option<Presentation> {
+    let m = page_master(doc, t)?.clone();
     let mut p = doc.clone();
     p.slide_size = doc.notes_size;
     p.masters = vec![m];
@@ -250,7 +276,7 @@ pub fn shapes_mut<'a>(doc: &'a mut Presentation, sel: &Selection) -> Option<&'a
     match sel.target {
         Target::Slides => doc.slides.get_mut(sel.slide).map(|s| &mut Arc::make_mut(s).shapes),
         Target::Master { master } => doc.masters.get_mut(master).map(|m| &mut Arc::make_mut(m).shapes),
-        Target::Handout => doc.handout_master.as_mut().map(|m| &mut Arc::make_mut(m).shapes),
+        t @ (Target::Handout | Target::NotesMaster) => page_master_mut(doc, t).map(|m| &mut Arc::make_mut(m).shapes),
         Target::Layout { master, layout } => {
             doc.masters.get_mut(master).and_then(|m| Arc::make_mut(m).layouts.get_mut(layout)).map(|l| &mut l.shapes)
         }
@@ -557,7 +583,7 @@ fn clamp_selection(st: &mut DocState) {
     st.selection.slides = slides;
     match st.selection.target {
         Target::Master { master } if master >= st.doc.masters.len() => st.selection.target = Target::Slides,
-        Target::Handout if st.doc.handout_master.is_none() => st.selection.target = Target::Slides,
+        t @ (Target::Handout | Target::NotesMaster) if page_master(&st.doc, t).is_none() => st.selection.target = Target::Slides,
         Target::Layout { master, layout } if st.doc.masters.get(master).is_none_or(|m| layout >= m.layouts.len()) => {
             st.selection.target = Target::Slides
         }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e5c06297..d76d4be1 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -862,7 +862,7 @@ fn handout_master_view_edits_and_round_trips() {
     s.execute("shape.insert", &json!({"preset": "rect", "rect": [20, 300, 100, 40]})).unwrap();
     assert_eq!(s.doc().unwrap().doc.handout_master.as_ref().unwrap().shapes.len(), 4);
     assert_eq!(s.doc().unwrap().doc.slides[0].shapes.len(), slide_shapes);
-    assert!(crate::handout_page(&s.doc().unwrap().doc).is_some_and(|p| p.masters.len() == 1 && p.slide_size == p.notes_size));
+    assert!(crate::master_page(&s.doc().unwrap().doc, Target::Handout).is_some_and(|p| p.masters.len() == 1 && p.slide_size == p.notes_size));
     s.execute("view.closeMaster", &json!({})).unwrap();
     assert_eq!(s.doc().unwrap().selection.target, Target::Slides);
     // Reopening doesn't make a second master, and it survives PPTX.
@@ -873,3 +873,33 @@ fn handout_master_view_edits_and_round_trips() {
     assert_eq!(hm.shapes.len(), 4);
     assert!(hm.shapes.iter().any(|x| x.ph_type() == Some(PhType::SlideNum)));
 }
+
+#[test]
+fn notes_master_view_edits_and_saves() {
+    use deckcraft_model::PhType;
+    let mut s = Session::with_new();
+    assert!(s.execute("notes.placeholders", &json!({"header": false})).is_err(), "only in the view");
+    assert_eq!(s.execute("view.notesMaster", &json!({})).unwrap()["created"], true);
+    let st = s.doc().unwrap();
+    assert_eq!(st.selection.target, Target::NotesMaster);
+    assert_eq!(crate::page_size(st), st.doc.notes_size);
+    let kinds: Vec<_> = st.shapes().iter().filter_map(|x| x.ph_type()).collect();
+    assert_eq!(kinds, [PhType::Header, PhType::Date, PhType::SlideImage, PhType::Body, PhType::Footer, PhType::SlideNum]);
+    let r = s.execute("notes.placeholders", &json!({"header": false, "date": false})).unwrap();
+    assert_eq!((r["header"].as_bool(), r["body"].as_bool()), (Some(false), Some(true)));
+    assert_eq!(s.doc().unwrap().shapes().len(), 4);
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.doc().unwrap().shapes().len(), 6);
+    s.execute("notes.placeholders", &json!({"header": false})).unwrap();
+    // A shape added in the view is on the notes master and is saved, even with no notes in the deck.
+    s.execute("shape.insert", &json!({"preset": "ellipse", "rect": [20, 20, 60, 60]})).unwrap();
+    assert!(s.doc().unwrap().doc.slides.iter().all(|sl| sl.notes.is_empty()));
+    assert!(crate::master_page(&s.doc().unwrap().doc, Target::NotesMaster).is_some());
+    let bytes = deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap();
+    let back = deckcraft_pptx::import(&bytes).unwrap();
+    let nm = back.notes_master.expect("notes master written");
+    assert_eq!(nm.shapes.len(), 6, "{:?}", nm.shapes.iter().map(|x| &x.name).collect::<Vec<_>>());
+    assert!(!nm.shapes.iter().any(|x| x.ph_type() == Some(PhType::Header)));
+    s.execute("view.closeMaster", &json!({})).unwrap();
+    assert_eq!(s.execute("view.notesMaster", &json!({})).unwrap()["created"], false);
+}
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index f6e6c282..4c13113f 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -439,7 +439,9 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
     let has_notes = p.slides.iter().any(|s| !s.notes.is_empty());
     let notes_master = "ppt/notesMasters/notesMaster1.xml";
     let mut notes_master_rid = None;
-    if has_notes {
+    // A notes master edited in Notes Master view is written as it is; otherwise the default one.
+    let kept_notes_master = p.notes_master.as_ref().filter(|m| !m.shapes.is_empty());
+    if has_notes || kept_notes_master.is_some() {
         let tname = format!("ppt/theme/theme{}.xml", p.masters.len() + 1);
         let mut no = Out::new(notes_master);
         no.rels.add("theme", &opc::relative(notes_master, &tname), false);
@@ -451,8 +453,16 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         let mut w = W::new();
         root_open(&mut w, "p:notesMaster", A::new());
         let bg = Background::Ref { idx: 1001, color: deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Bg1) };
-        csld(&mut w, &mut x, &mut no, "", Some(&bg), &notes_master_shapes(p.notes_size));
-        clr_map(&mut w, &[]);
+        match kept_notes_master {
+            Some(m) => {
+                csld(&mut w, &mut x, &mut no, "", Some(m.background.as_ref().unwrap_or(&bg)), &m.shapes);
+                clr_map(&mut w, &m.color_map);
+            }
+            None => {
+                csld(&mut w, &mut x, &mut no, "", Some(&bg), &notes_master_shapes(p.notes_size));
+                clr_map(&mut w, &[]);
+            }
+        }
         dml::list_style(&mut w, &mut x, &mut no, "p:notesStyle", &notes_style());
         w.close("p:notesMaster");
         x.pkg.xml_part(notes_master, CT_NOTES_MASTER, w.finish());
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 5e9a7aa8..0d5166e1 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -124,7 +124,9 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
         }
         Some((Target::Master { master }, d)) => master_tex(ui.ctx(), &d.doc, master, None, px, visible),
         Some((Target::Layout { master, layout }, d)) => master_tex(ui.ctx(), &d.doc, master, Some(layout), px, visible),
-        Some((Target::Handout, d)) => deckcraft_engine::handout_page(&d.doc).and_then(|p| master_tex(ui.ctx(), &p, 0, None, px, visible)),
+        Some((t @ (Target::Handout | Target::NotesMaster), d)) => {
+            deckcraft_engine::master_page(&d.doc, t).and_then(|p| master_tex(ui.ctx(), &p, 0, None, px, visible))
+        }
         None => None,
     };
     if let Some((tex, region)) = tex {
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index b251a2f1..c1432b01 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -191,6 +191,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("-", ""),
                 ("Slide Master", "view.slideMaster"),
                 ("Handout Master", "view.handoutMaster"),
+                ("Notes Master", "view.notesMaster"),
                 ("-", ""),
                 ("Ruler", "view.ruler"),
                 ("Gridlines", "view.gridlines"),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index ee5c3391..74cf3d24 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -108,6 +108,8 @@ fn contextual(app: &SlideApp) -> Vec<&'static str> {
     let Some(st) = app.session.active() else { return v };
     if st.selection.target == Target::Handout {
         v.push("Handout Master");
+    } else if st.selection.target == Target::NotesMaster {
+        v.push("Notes Master");
     } else if st.selection.target != Target::Slides {
         v.push("Slide Master");
     }
@@ -225,6 +227,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
             "Playback" => playback(app, ui),
             "Slide Master" => slide_master(app, ui),
             "Handout Master" => handout_master(app, ui),
+            "Notes Master" => notes_master(app, ui),
             _ => {}
         }
     });
@@ -1829,8 +1832,10 @@ fn view(app: &mut SlideApp, ui: &mut Ui) {
         if big_button_ex(ui, Icon::HandoutMaster, "Handout\nMaster", true, false, in_handout).0.clicked() {
             let _ = app.run(if in_handout { "view.closeMaster" } else { "view.handoutMaster" }, json!({}));
         }
-        let r = big_button(ui, Icon::NotesMaster, "Notes\nMaster", false);
-        let _ = r.on_hover_text("Notes Master (coming soon)");
+        let in_notes = app.session.active().is_some_and(|d| d.selection.target == Target::NotesMaster);
+        if big_button_ex(ui, Icon::NotesMaster, "Notes\nMaster", true, false, in_notes).0.clicked() {
+            let _ = app.run(if in_notes { "view.closeMaster" } else { "view.notesMaster" }, json!({}));
+        }
     });
     group(ui, |ui| {
         rows(ui, |ui| {
@@ -2413,6 +2418,36 @@ fn slide_master(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+fn notes_master(app: &mut SlideApp, ui: &mut Ui) {
+    group(ui, |ui| {
+        use deckcraft_model::PhType;
+        let shown = |app: &SlideApp, k: PhType| {
+            app.session.active().and_then(|d| d.doc.notes_master.as_ref()).is_some_and(|m| m.shapes.iter().any(|s| s.ph_type() == Some(k)))
+        };
+        for col in [
+            [("Header", "header", PhType::Header), ("Slide Image", "slideImage", PhType::SlideImage), ("Footer", "footer", PhType::Footer)],
+            [("Date", "date", PhType::Date), ("Body", "body", PhType::Body), ("Page Number", "pageNumber", PhType::SlideNum)],
+        ] {
+            rows(ui, |ui| {
+                for (label, key, k) in col {
+                    let mut on = shown(app, k);
+                    if ui.checkbox(&mut on, label).changed() {
+                        run(app, "notes.placeholders", json!({ key: on }));
+                    }
+                }
+            });
+        }
+    });
+    group(ui, |ui| {
+        big(app, ui, Icon::FormatBackground, "Background\nStyles", "view.pane", json!({"pane": "background"}));
+    });
+    group(ui, |ui| {
+        if big_button(ui, Icon::Close, "Close\nMaster View", true).clicked() {
+            run(app, "view.closeMaster", json!({}));
+        }
+    });
+}
+
 fn handout_master(app: &mut SlideApp, ui: &mut Ui) {
     group(ui, |ui| {
         let r = big_button(ui, Icon::Layout, &format!("Slides Per\nPage: {}", app.ui.handout_per_page), true);
diff --git a/crates/ui-egui/src/thumbs.rs b/crates/ui-egui/src/thumbs.rs
index 2fbc43db..067a00c6 100644
--- a/crates/ui-egui/src/thumbs.rs
+++ b/crates/ui-egui/src/thumbs.rs
@@ -12,7 +12,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
     let in_master = app.session.active().is_some_and(|d| d.selection.target != Target::Slides);
     // Handout Master view has one page and no thumbnails, as in PowerPoint.
-    if app.session.active().is_some_and(|d| d.selection.target == Target::Handout) {
+    if app.session.active().is_some_and(|d| d.selection.target.is_page_master()) {
         return;
     }
     egui::Panel::left("thumbs")
diff --git a/docs/gaps.md b/docs/gaps.md
index e440b77a..f9a216ac 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -161,10 +161,11 @@ Detail in [file-format-parity.md](file-format-parity.md).
 Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a **beta blocker**.
 
 ### Notes and Handout masters
-- **Evidence:** View ▸ Handout Master edits the handout master (header, date, footer and page
-  number placeholders, background, slides-per-page preview) and PPTX keeps it. There's no Notes
-  Master view yet, and PDF handouts don't use the handout master's text.
-- **Estimate:** 2–3 h (Notes Master view), 1 h (handout text in PDF).
+- **Evidence:** View ▸ Handout Master and View ▸ Notes Master edit both masters (placeholders,
+  background, a slides-per-page preview for handouts) and PPTX keeps them. The notes master's slide
+  image is an empty frame rather than a slide preview, and notes pages and PDF handouts don't take
+  their layout and text from the masters yet.
+- **Estimate:** 2–3 h (notes pages and PDF handouts follow the masters).
 
 ### Edit points, text warp, 3-D
 - **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
@@ -258,6 +259,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Notes Master view: the masters gap is now notes pages and PDF handouts following the masters |
 | 2026-10-14 | minor | Handout Master view: the masters gap is now the Notes Master view and handout text in PDF |
 | 2026-10-13 | minor | Owned PPTX corpus for tables, charts, animations, media, sections and masters. Handout-master text is kept; the corpus gap is now a larger set and PowerPoint reference renders |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |

From 2c15fcc033893a26a9282b0f72e7f558f1e1f02f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:32:30 +0300
Subject: [PATCH 200/376] Metafile: draw EMF+ only pictures

EMF+ only files (no GDI fallback) used to render as empty pictures. Play
their vector records: solid brushes and pens, paths, rects, polygons,
lines, ellipses and Beziers under world/page transforms with save/restore
and containers. Dual files keep drawing their EMF records.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/metafile/src/canvas.rs  |  16 +-
 crates/metafile/src/emf.rs     |   9 +-
 crates/metafile/src/emfplus.rs | 408 +++++++++++++++++++++++++++++++++
 crates/metafile/src/lib.rs     |   1 +
 crates/metafile/src/tests.rs   | 106 +++++++++
 5 files changed, 538 insertions(+), 2 deletions(-)
 create mode 100644 crates/metafile/src/emfplus.rs

diff --git a/crates/metafile/src/canvas.rs b/crates/metafile/src/canvas.rs
index 4ffa56bf..99f42071 100644
--- a/crates/metafile/src/canvas.rs
+++ b/crates/metafile/src/canvas.rs
@@ -16,7 +16,7 @@ const STOCK: u32 = 0x8000_0000;
 pub(crate) const PS_NULL: u32 = 5;
 /// Pen style bits; the rest of the style word holds end-cap, join and type flags.
 pub(crate) const PS_STYLE_MASK: u32 = 0x0F;
-const BS_SOLID: u32 = 0;
+pub(crate) const BS_SOLID: u32 = 0;
 pub(crate) const BS_NULL: u32 = 1;
 pub(crate) const BS_HATCHED: u32 = 2;
 /// BS_PATTERN, BS_DIBPATTERN and BS_DIBPATTERNPT: the brush paints a bitmap tile.
@@ -442,6 +442,20 @@ impl Canvas {
         }
     }
 
+    /// The current world transform (EMF+ draws through it).
+    pub fn world(&self) -> Xform {
+        self.map.world
+    }
+
+    /// Sets the pen and brush directly (EMF+ records name their own pen and brush).
+    pub fn set_pen(&mut self, pen: Pen) {
+        self.pen = pen;
+    }
+
+    pub fn set_brush(&mut self, brush: Brush) {
+        self.brush = brush;
+    }
+
     /// Pushes the drawing state. Past [`MAX_STACK`] levels the parse stops, since later restores
     /// could no longer match the file.
     pub fn save_dc(&mut self) {
diff --git a/crates/metafile/src/emf.rs b/crates/metafile/src/emf.rs
index 709537f7..21ad9b62 100644
--- a/crates/metafile/src/emf.rs
+++ b/crates/metafile/src/emf.rs
@@ -42,6 +42,7 @@ pub(crate) fn parse(input: Bytes) -> Result<(Canvas, Option<Frame>), Error> {
     if let Some(px_mm) = device_px_per_mm(input) {
         cv.set_device_mm(px_mm);
     }
+    let mut plus = crate::emfplus::Plus::new();
     let mut parsed = 0usize;
     let mut pos = hsize.max(88);
     while !cv.full() {
@@ -54,7 +55,13 @@ pub(crate) fn parse(input: Bytes) -> Result<(Canvas, Option<Frame>), Error> {
         if typ == 14 {
             break;
         }
-        record(&mut cv, typ, Bytes(rec));
+        if typ == 70 && Bytes(rec).u32(12) == Some(crate::emfplus::EMF_PLUS) {
+            if let Some(data) = Bytes(rec).tail(16) {
+                plus.comment(&mut cv, data);
+            }
+        } else {
+            record(&mut cv, typ, Bytes(rec));
+        }
         parsed += 1;
         let Some(next) = pos.checked_add(size) else { break };
         pos = next;
diff --git a/crates/metafile/src/emfplus.rs b/crates/metafile/src/emfplus.rs
new file mode 100644
index 00000000..3aef2842
--- /dev/null
+++ b/crates/metafile/src/emfplus.rs
@@ -0,0 +1,408 @@
+//! EMF+ (MS-EMFPLUS): GDI+ drawing records carried in EMF comment records.
+//!
+//! Most EMF+ files are *dual*: the same picture is also drawn with plain EMF records, which
+//! [`crate::emf`] already plays, so this reader ignores their EMF+ part. An *EMF+ only* file has
+//! nothing else to draw, so it used to show as an empty picture; for those this reader plays the
+//! vector records: solid brushes and pens, paths, rectangles, polygons, lines, ellipses and
+//! Béziers, under the world and page transforms, save/restore and containers. Images, text,
+//! gradient brushes, clipping and arcs are not drawn yet.
+
+use crate::bytes::Bytes;
+use crate::canvas::{BS_NULL, BS_SOLID, Brush, Canvas, PS_NULL, Pen, Xform, mul};
+use crate::geom::{Op, P};
+
+/// "EMF+" as the comment identifier of an EMR_COMMENT holding EMF+ records.
+pub(crate) const EMF_PLUS: u32 = 0x2B46_4D45;
+const IDENTITY: Xform = [1.0, 0.0, 0.0, 1.0, 0.0, 0.0];
+/// GDI+ allows 64 objects; ids are a byte.
+const MAX_OBJECTS: usize = 64;
+const MAX_STACK: usize = 64;
+/// Points per path or point list read, as the plain EMF reader caps paths.
+const MAX_POINTS: usize = 100_000;
+
+#[derive(Clone, Debug)]
+enum Obj {
+    Brush([u8; 4]),
+    Pen { color: [u8; 4], width: f64 },
+    Path(Vec<Op>),
+}
+
+pub(crate) struct Plus {
+    /// An EMF+ header said the file is EMF+ only, so these records are the picture.
+    active: bool,
+    dpi: f64,
+    world: Xform,
+    page: f64,
+    objects: Vec<Option<Obj>>,
+    stack: Vec<(u32, Xform, f64)>,
+}
+
+impl Plus {
+    pub fn new() -> Self {
+        Plus { active: false, dpi: 96.0, world: IDENTITY, page: 1.0, objects: vec![None; MAX_OBJECTS], stack: Vec::new() }
+    }
+
+    /// Plays the EMF+ records of one EMR_COMMENT payload (after the identifier).
+    pub fn comment(&mut self, cv: &mut Canvas, data: Bytes) {
+        let mut pos = 0usize;
+        while !cv.full() {
+            let (Some(typ), Some(flags), Some(size), Some(dsize)) = (data.u16(pos), data.u16(pos + 2), data.u32(pos + 4), data.u32(pos + 8)) else {
+                break;
+            };
+            let (size, dsize) = (size as usize, dsize as usize);
+            if size < 12 || dsize > size - 12 {
+                break;
+            }
+            let Some(rec) = data.slice(pos + 12, dsize) else { break };
+            let _ = self.record(cv, typ, flags, Bytes(rec));
+            let Some(next) = pos.checked_add(size) else { break };
+            pos = next;
+        }
+    }
+
+    fn record(&mut self, cv: &mut Canvas, typ: u16, flags: u16, r: Bytes) -> Option<()> {
+        if typ == 0x4001 {
+            // Header: dual files also draw with EMF records, which win.
+            self.active = flags & 1 == 0;
+            if let Some(d) = r.u32(8).map(f64::from).filter(|d| *d > 0.0 && *d < 100_000.0) {
+                self.dpi = d;
+            }
+            return Some(());
+        }
+        if !self.active {
+            return None;
+        }
+        let compressed = flags & 0x4000 != 0;
+        let id = usize::from(flags & 0xFF);
+        match typ {
+            0x4008 => self.object(flags, r),
+            0x400A => self.fill_rects(cv, flags, r),
+            0x400B => self.with_pen(id, |p| p.draw_rects(cv, compressed, r)),
+            0x400C => self.fill_polygon(cv, flags, r),
+            0x400D => self.with_pen(id, |p| {
+                let pts = points(r, 4, r.u32(0)? as usize, compressed)?;
+                p.shape(cv, poly_ops(&pts, flags & 0x2000 != 0), false, true);
+                Some(())
+            }),
+            0x400E => self.fill_ellipse(cv, flags, r),
+            0x400F => self.with_pen(id, |p| {
+                let rect = rects(r, 0, 1, compressed)?;
+                p.shape(cv, ellipse_ops(*rect.first()?), false, true);
+                Some(())
+            }),
+            0x4014 => self.fill_path(cv, flags, r),
+            0x4015 => {
+                let path = self.path(id);
+                r.u32(0).and_then(|pen| {
+                    self.with_pen(pen as usize, |p| {
+                        p.shape(cv, path?, false, true);
+                        Some(())
+                    })
+                })
+            }
+            0x4019 => self.with_pen(id, |p| {
+                let pts = points(r, 4, r.u32(0)? as usize, compressed)?;
+                let (first, rest) = pts.split_first()?;
+                let mut ops = vec![Op::M(*first)];
+                ops.extend(rest.as_chunks::<3>().0.iter().map(|c| Op::C(c[0], c[1], c[2])));
+                p.shape(cv, ops, false, true);
+                Some(())
+            }),
+            0x4025 | 0x4028 => r.u32(0).map(|i| self.push(i)),
+            0x4027 => r.u32(24).map(|i| self.push(i)),
+            0x4026 | 0x4029 => r.u32(0).map(|i| self.pop(i)),
+            0x402A => matrix(r, 0).map(|m| self.world = m),
+            0x402B => {
+                self.world = IDENTITY;
+                Some(())
+            }
+            0x402C => matrix(r, 0).and_then(|m| self.apply(m, flags)),
+            0x402D => self.apply([1.0, 0.0, 0.0, 1.0, f64::from(r.f32(0)?), f64::from(r.f32(4)?)], flags),
+            0x402E => self.apply([f64::from(r.f32(0)?), 0.0, 0.0, f64::from(r.f32(4)?), 0.0, 0.0], flags),
+            0x402F => {
+                let a = f64::from(r.f32(0)?).to_radians();
+                self.apply([a.cos(), a.sin(), -a.sin(), a.cos(), 0.0, 0.0], flags)
+            }
+            0x4030 => {
+                let scale = f64::from(r.f32(0)?);
+                let unit = match flags & 0xFF {
+                    3 => self.dpi / 72.0,
+                    4 => self.dpi,
+                    5 => self.dpi / 300.0,
+                    6 => self.dpi / 25.4,
+                    _ => 1.0,
+                };
+                let page = scale * unit;
+                if page.is_finite() && page > 0.0 && page < 1.0e6 {
+                    self.page = page;
+                }
+                Some(())
+            }
+            _ => None,
+        }
+    }
+
+    /// Without the `A` flag a transform is applied before the world transform (prepended).
+    fn apply(&mut self, m: Xform, flags: u16) -> Option<()> {
+        self.world = if flags & 0x2000 != 0 { mul(self.world, m) } else { mul(m, self.world) };
+        Some(())
+    }
+
+    fn push(&mut self, id: u32) {
+        if self.stack.len() < MAX_STACK {
+            self.stack.push((id, self.world, self.page));
+        }
+    }
+
+    fn pop(&mut self, id: u32) {
+        if let Some(i) = self.stack.iter().rposition(|s| s.0 == id) {
+            let (_, w, p) = self.stack[i];
+            self.stack.truncate(i);
+            self.world = w;
+            self.page = p;
+        }
+    }
+
+    fn object(&mut self, flags: u16, r: Bytes) -> Option<()> {
+        if flags & 0x8000 != 0 {
+            // Continued (split) objects are images and large paths; not read yet.
+            return None;
+        }
+        let id = usize::from(flags & 0xFF);
+        let obj = match (flags >> 8) & 0x7F {
+            1 => brush(r, 0).map(|(c, _)| Obj::Brush(c)),
+            2 => pen(r),
+            3 => path(r).map(Obj::Path),
+            _ => None,
+        };
+        if let Some(slot) = self.objects.get_mut(id) {
+            *slot = obj;
+        }
+        Some(())
+    }
+
+    fn path(&self, id: usize) -> Option<Vec<Op>> {
+        match self.objects.get(id)? {
+            Some(Obj::Path(ops)) => Some(ops.clone()),
+            _ => None,
+        }
+    }
+
+    /// The brush colour of a fill record: an ARGB value with the `S` flag, else a brush object.
+    fn brush_of(&self, flags: u16, v: u32) -> Option<[u8; 4]> {
+        if flags & 0x8000 != 0 {
+            return Some(argb(v));
+        }
+        match self.objects.get(v as usize)? {
+            Some(Obj::Brush(c)) => Some(*c),
+            _ => None,
+        }
+    }
+
+    fn with_pen<T>(&mut self, id: usize, f: impl FnOnce(&mut Painter) -> Option<T>) -> Option<T> {
+        let Some(Some(Obj::Pen { color, width })) = self.objects.get(id).cloned() else { return None };
+        let mut p = Painter { xf: mul(self.world, [self.page, 0.0, 0.0, self.page, 0.0, 0.0]), pen: Some((color, width)), fill: None };
+        f(&mut p)
+    }
+
+    fn filler(&self, color: [u8; 4]) -> Painter {
+        Painter { xf: mul(self.world, [self.page, 0.0, 0.0, self.page, 0.0, 0.0]), pen: None, fill: Some(color) }
+    }
+
+    fn fill_rects(&mut self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
+        let c = self.brush_of(flags, r.u32(0)?)?;
+        let rs = rects(r, 8, r.u32(4)? as usize, flags & 0x4000 != 0)?;
+        let p = self.filler(c);
+        for rc in rs {
+            p.shape(cv, rect_ops(rc), true, false);
+        }
+        Some(())
+    }
+
+    fn fill_polygon(&mut self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
+        let c = self.brush_of(flags, r.u32(0)?)?;
+        let pts = points(r, 8, r.u32(4)? as usize, flags & 0x4000 != 0)?;
+        self.filler(c).shape(cv, poly_ops(&pts, true), true, false);
+        Some(())
+    }
+
+    fn fill_ellipse(&mut self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
+        let c = self.brush_of(flags, r.u32(0)?)?;
+        let rect = *rects(r, 4, 1, flags & 0x4000 != 0)?.first()?;
+        self.filler(c).shape(cv, ellipse_ops(rect), true, false);
+        Some(())
+    }
+
+    fn fill_path(&mut self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
+        let c = self.brush_of(flags, r.u32(0)?)?;
+        let ops = self.path(usize::from(flags & 0xFF))?;
+        self.filler(c).shape(cv, ops, true, false);
+        Some(())
+    }
+}
+
+/// Draws through the canvas with EMF+'s transform and its own pen or brush, then puts the
+/// canvas's GDI state back.
+struct Painter {
+    xf: Xform,
+    pen: Option<([u8; 4], f64)>,
+    fill: Option<[u8; 4]>,
+}
+
+impl Painter {
+    fn shape(&self, cv: &mut Canvas, ops: Vec<Op>, fill: bool, stroke: bool) {
+        let world = cv.world();
+        cv.save_dc();
+        cv.modify_world(mul(self.xf, world), 4);
+        let (pc, pw) = self.pen.unwrap_or(([0, 0, 0, 0], 0.0));
+        cv.set_pen(Pen { style: if self.pen.is_some() { 0 } else { PS_NULL }, width: pw, color: pc });
+        cv.set_brush(match self.fill {
+            Some(c) => Brush::new(BS_SOLID, c),
+            None => Brush::new(BS_NULL, [0, 0, 0, 0]),
+        });
+        cv.shape(&ops, fill, stroke);
+        cv.restore_dc(-1);
+    }
+
+    fn draw_rects(&self, cv: &mut Canvas, compressed: bool, r: Bytes) -> Option<()> {
+        for rc in rects(r, 4, r.u32(0)? as usize, compressed)? {
+            self.shape(cv, rect_ops(rc), false, true);
+        }
+        Some(())
+    }
+}
+
+/// ARGB (0xAARRGGBB) to RGBA.
+fn argb(v: u32) -> [u8; 4] {
+    [(v >> 16) as u8, (v >> 8) as u8, v as u8, (v >> 24) as u8]
+}
+
+fn matrix(r: Bytes, off: usize) -> Option<Xform> {
+    let mut m = [0.0; 6];
+    for (i, v) in m.iter_mut().enumerate() {
+        *v = f64::from(r.f32(off + i * 4)?);
+    }
+    m.iter().all(|v| v.is_finite()).then_some(m)
+}
+
+/// A brush object at `off`: its colour and byte length. Only solid brushes are read; other kinds
+/// (hatch, texture, gradients) are given their first colour so shapes still show.
+fn brush(r: Bytes, off: usize) -> Option<([u8; 4], usize)> {
+    let kind = r.u32(off + 4)?;
+    let c = argb(r.u32(off + 8)?);
+    let c = if kind == 1 { argb(r.u32(off + 12)?) } else { c };
+    Some((c, 12))
+}
+
+/// A pen object: version, type, then pen data (flags, unit, width, optional fields), then a brush.
+fn pen(r: Bytes) -> Option<Obj> {
+    let pflags = r.u32(8)?;
+    let width = f64::from(r.f32(16)?);
+    let mut off = 20usize;
+    for (bit, len) in [(0x1, 24), (0x2, 4), (0x4, 4), (0x8, 4), (0x10, 4), (0x20, 4), (0x40, 4), (0x80, 4)] {
+        if pflags & bit != 0 {
+            off += len;
+        }
+    }
+    for bit in [0x100, 0x200, 0x400] {
+        if pflags & bit != 0 {
+            off += if bit == 0x200 { 4 } else { 4 + 4 * (r.u32(off)? as usize).min(MAX_POINTS) };
+        }
+    }
+    for bit in [0x800, 0x1000] {
+        if pflags & bit != 0 {
+            off += 4 + (r.u32(off)? as usize).min(1 << 20);
+        }
+    }
+    let (color, _) = brush(r, off)?;
+    Some(Obj::Pen { color, width: if width.is_finite() { width.clamp(0.0, 1.0e5) } else { 0.0 } })
+}
+
+/// A path object: points, then one type byte per point (start, line, Bézier; 0x80 closes).
+fn path(r: Bytes) -> Option<Vec<Op>> {
+    let n = (r.u32(4)? as usize).min(MAX_POINTS);
+    let pflags = r.u32(8)?;
+    if pflags & 0x1800 != 0 {
+        // Relative (0x0800) and run-length encoded (0x1000) points: not read yet.
+        return None;
+    }
+    let compressed = pflags & 0x4000 != 0;
+    let pts = points(r, 12, n, compressed)?;
+    let toff = 12 + n * if compressed { 4 } else { 8 };
+    let types = r.slice(toff, n)?;
+    let mut ops = Vec::with_capacity(n + 4);
+    let mut i = 0;
+    while i < n {
+        let (t, p) = (types[i], pts[i]);
+        match t & 0x07 {
+            0 => ops.push(Op::M(p)),
+            3 if i + 2 < n => {
+                ops.push(Op::C(p, pts[i + 1], pts[i + 2]));
+                let last = types[i + 2];
+                i += 2;
+                if last & 0x80 != 0 {
+                    ops.push(Op::Z);
+                }
+                i += 1;
+                continue;
+            }
+            _ => ops.push(Op::L(p)),
+        }
+        if t & 0x80 != 0 {
+            ops.push(Op::Z);
+        }
+        i += 1;
+    }
+    Some(ops)
+}
+
+/// `n` points at `off`: 16-bit integers when compressed, else 32-bit floats.
+fn points(r: Bytes, off: usize, n: usize, compressed: bool) -> Option<Vec<P>> {
+    let n = n.min(MAX_POINTS);
+    let mut v = Vec::with_capacity(n);
+    for i in 0..n {
+        v.push(if compressed {
+            (f64::from(r.i16(off + i * 4)?), f64::from(r.i16(off + i * 4 + 2)?))
+        } else {
+            let (x, y) = (f64::from(r.f32(off + i * 8)?), f64::from(r.f32(off + i * 8 + 4)?));
+            if !(x.is_finite() && y.is_finite()) {
+                return None;
+            }
+            (x, y)
+        });
+    }
+    Some(v)
+}
+
+/// `n` rectangles (x, y, w, h) at `off`, as `[l, t, r, b]`.
+fn rects(r: Bytes, off: usize, n: usize, compressed: bool) -> Option<Vec<[f64; 4]>> {
+    let pts = points(r, off, n.min(MAX_POINTS / 2).checked_mul(2)?, compressed)?;
+    Some(pts.as_chunks::<2>().0.iter().map(|c| [c[0].0, c[0].1, c[0].0 + c[1].0, c[0].1 + c[1].1]).collect())
+}
+
+fn rect_ops([l, t, r, b]: [f64; 4]) -> Vec<Op> {
+    crate::geom::rect(l, t, r, b)
+}
+
+fn poly_ops(pts: &[P], close: bool) -> Vec<Op> {
+    let mut ops: Vec<Op> = pts.iter().enumerate().map(|(i, p)| if i == 0 { Op::M(*p) } else { Op::L(*p) }).collect();
+    if close {
+        ops.push(Op::Z);
+    }
+    ops
+}
+
+/// An ellipse in its bounding box, as four cubic arcs.
+fn ellipse_ops([l, t, r, b]: [f64; 4]) -> Vec<Op> {
+    let (cx, cy, rx, ry) = ((l + r) / 2.0, (t + b) / 2.0, (r - l) / 2.0, (b - t) / 2.0);
+    let k = 0.552_284_75;
+    let (ox, oy) = (rx * k, ry * k);
+    vec![
+        Op::M((cx + rx, cy)),
+        Op::C((cx + rx, cy + oy), (cx + ox, cy + ry), (cx, cy + ry)),
+        Op::C((cx - ox, cy + ry), (cx - rx, cy + oy), (cx - rx, cy)),
+        Op::C((cx - rx, cy - oy), (cx - ox, cy - ry), (cx, cy - ry)),
+        Op::C((cx + ox, cy - ry), (cx + rx, cy - oy), (cx + rx, cy)),
+        Op::Z,
+    ]
+}
diff --git a/crates/metafile/src/lib.rs b/crates/metafile/src/lib.rs
index d7d98501..cdf18154 100644
--- a/crates/metafile/src/lib.rs
+++ b/crates/metafile/src/lib.rs
@@ -17,6 +17,7 @@ mod bytes;
 mod canvas;
 mod dib;
 mod emf;
+mod emfplus;
 mod geom;
 mod place;
 mod text;
diff --git a/crates/metafile/src/tests.rs b/crates/metafile/src/tests.rs
index 271cc83b..e3c4c923 100644
--- a/crates/metafile/src/tests.rs
+++ b/crates/metafile/src/tests.rs
@@ -1518,3 +1518,109 @@ fn pattern_brush_pixels_count_against_the_byte_budget() {
     let p = wmf200(&recs);
     assert!(p.items.is_empty(), "the parse stopped at the budget: {:?}", p.items.len());
 }
+
+// ---- EMF+ ----
+
+fn f32s(v: &[f32]) -> Vec<u8> {
+    v.iter().flat_map(|x| x.to_le_bytes()).collect()
+}
+
+/// One EMF+ record: type, flags, size, data size, data (padded to 4).
+fn prec(typ: u16, flags: u16, data: &[u8]) -> Vec<u8> {
+    let mut d = data.to_vec();
+    while !d.len().is_multiple_of(4) {
+        d.push(0);
+    }
+    let mut v = typ.to_le_bytes().to_vec();
+    v.extend(flags.to_le_bytes());
+    v.extend(((12 + d.len()) as u32).to_le_bytes());
+    v.extend((d.len() as u32).to_le_bytes());
+    v.extend(d);
+    v
+}
+
+/// An EMR_COMMENT carrying EMF+ records.
+fn plus_comment(recs: &[Vec<u8>]) -> Vec<u8> {
+    let body = recs.concat();
+    let mut p = ((body.len() + 4) as u32).to_le_bytes().to_vec();
+    p.extend(0x2B46_4D45u32.to_le_bytes());
+    p.extend(body);
+    erec(70, &p)
+}
+
+/// EMF+ header: dual (bit 0) or EMF+ only, 96 dpi.
+fn plus_header(dual: bool) -> Vec<u8> {
+    prec(0x4001, u16::from(dual), &cat(vec![h32(0xDBC0_1002), h32(0), h32(96), h32(96)]))
+}
+
+fn solid_pen(argb: u32, width: f32) -> Vec<u8> {
+    cat(vec![h32(0xDBC0_1002), h32(0), h32(0), h32(0), f32s(&[width]), h32(0xDBC0_1002), h32(0), h32(argb)])
+}
+
+#[test]
+fn emfplus_only_fill_rects_with_argb_colour() {
+    let fill = prec(0x400A, 0x8000, &cat(vec![h32(0xFF00_80FF), h32(1), f32s(&[10.0, 20.0, 30.0, 40.0])]));
+    let p = parse(&emf(&[plus_comment(&[plus_header(false), fill])], [0; 4], [0; 4])).unwrap();
+    assert_eq!(p.items.len(), 1);
+    let (segs, fill, stroke, _) = path_segs(&p.items[0]);
+    assert_eq!(fill, Some([0x00, 0x80, 0xFF, 0xFF]));
+    assert_eq!(stroke, None);
+    // Geometry is placed relative to the drawing's bounding box (no frame given).
+    assert_eq!((p.width, p.height), (30.0, 40.0));
+    assert_eq!(segs[0], Seg::Move(0.0, 0.0));
+    assert!(segs.contains(&Seg::Line(30.0, 40.0)));
+}
+
+#[test]
+fn emfplus_dual_files_draw_only_the_emf_records() {
+    let fill = prec(0x400A, 0x8000, &cat(vec![h32(0xFFFF_0000), h32(1), f32s(&[0.0, 0.0, 5.0, 5.0])]));
+    let gdi = erec(43, &cat(vec![e32(0), e32(0), e32(9), e32(9)]));
+    let p = parse(&emf(&[plus_comment(&[plus_header(true), fill]), gdi], [0; 4], [0; 4])).unwrap();
+    assert_eq!(p.items.len(), 1);
+    assert_eq!(path_segs(&p.items[0]).1, Some([255, 255, 255, 255]));
+}
+
+#[test]
+fn emfplus_pen_object_draws_lines_under_a_scale_transform() {
+    let pen = prec(0x4008, 0x0200 | 3, &solid_pen(0xFF00_FF00, 2.0));
+    let scale = prec(0x402E, 0, &f32s(&[2.0, 3.0]));
+    let lines = prec(0x400D, 3, &cat(vec![h32(2), f32s(&[1.0, 1.0, 4.0, 2.0])]));
+    let p = parse(&emf(&[plus_comment(&[plus_header(false), pen, scale, lines])], [0; 4], [0; 4])).unwrap();
+    let (segs, fill, stroke, _) = path_segs(&p.items[0]);
+    // (1,1)-(4,2) scaled by (2,3) is (2,3)-(8,6), placed relative to its bounding box.
+    assert_eq!(segs, &vec![Seg::Move(0.0, 0.0), Seg::Line(6.0, 3.0)]);
+    assert_eq!(fill, None);
+    let (c, w) = stroke.unwrap();
+    assert_eq!(c, [0, 255, 0, 255]);
+    assert!(w > 0.0);
+}
+
+#[test]
+fn emfplus_path_object_fills_with_brush_object_and_restore_undoes_transform() {
+    let brush = prec(0x4008, 0x0100 | 1, &cat(vec![h32(0xDBC0_1002), h32(0), h32(0x8012_3456)]));
+    // Triangle: start, line, line|close.
+    let path = prec(0x4008, 0x0300 | 2, &cat(vec![h32(0xDBC0_1002), h32(3), h32(0), f32s(&[0.0, 0.0, 10.0, 0.0, 0.0, 10.0]), vec![0, 1, 0x81]]));
+    let save = prec(0x4025, 0, &h32(7));
+    let mv = prec(0x402D, 0, &f32s(&[100.0, 0.0]));
+    let restore = prec(0x4026, 0, &h32(7));
+    let fill = prec(0x4014, 2, &h32(1));
+    let p = parse(&emf(&[plus_comment(&[plus_header(false), brush, path, save, mv, restore, fill])], [0; 4], [0; 4])).unwrap();
+    let (segs, fill, _, _) = path_segs(&p.items[0]);
+    assert_eq!(fill, Some([0x12, 0x34, 0x56, 0x80]));
+    assert_eq!(segs, &vec![Seg::Move(0.0, 0.0), Seg::Line(10.0, 0.0), Seg::Line(0.0, 10.0), Seg::Close]);
+}
+
+#[test]
+fn emfplus_garbage_records_never_panic() {
+    let mut s = 0x1234_5678u32;
+    for _ in 0..300 {
+        let mut recs = vec![plus_header(false)];
+        for _ in 0..6 {
+            s = s.wrapping_mul(1_103_515_245).wrapping_add(12_345);
+            let typ = 0x4000 + (s >> 16) as u16 % 0x40;
+            let data: Vec<u8> = (0..(s % 64)).map(|i| (s.rotate_left(i)) as u8).collect();
+            recs.push(prec(typ, (s >> 8) as u16, &data));
+        }
+        let _ = parse(&emf(&[plus_comment(&recs)], [0; 4], [0; 4]));
+    }
+}

From c94b5c8d1ea05adf8374d2d4b3162b69aa697ba3 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:35:12 +0300
Subject: [PATCH 201/376] PPTX: round-trip 3-D models and animation bounce end

An owned corpus opens, saves and reopens SmartArt and OLE kept as XML, audio and video bookmarks and trims, a section with a hidden slide, slide-number and date fields, ink, .glb models and animation repeat, bounce end and triggers. Relationship-bearing SmartArt and OLE, playback options and rewind stay with their open PRs.
---
 ROADMAP.md                        |   6 +-
 crates/engine/src/cmd/edit.rs     |   6 +
 crates/engine/src/cmd/insert.rs   |   1 +
 crates/engine/src/tools.rs        |   7 +-
 crates/model/src/lib.rs           |   8 +
 crates/pptx/src/lib.rs            |   1 +
 crates/pptx/src/opc.rs            |   2 +
 crates/pptx/src/read/mod.rs       |  37 ++-
 crates/pptx/src/read/shapes.rs    |  61 ++++-
 crates/pptx/src/read/timing.rs    |   1 +
 crates/pptx/src/write/mod.rs      |   1 +
 crates/pptx/src/write/shapes.rs   |  61 ++++-
 crates/pptx/src/write/timing.rs   |   4 +
 crates/pptx/tests/corpus_media.rs | 373 ++++++++++++++++++++++++++++++
 docs/animation-parity.md          |   7 +-
 docs/file-format-parity.md        |  11 +-
 docs/gaps.md                      |  13 +-
 docs/roadmap.md                   |   9 +-
 18 files changed, 584 insertions(+), 25 deletions(-)
 create mode 100644 crates/pptx/tests/corpus_media.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..e8f2af5d 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: PPTX corpus for models, media and timing) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -112,7 +112,7 @@ Ranked; detail and the full beta plan in [docs/roadmap.md](docs/roadmap.md).
 1. **No data loss, no startup crashes:** Close's save prompt (#60), Windows GPU crashes (#40, #59),
    image paste (#53), editor soak tests. 10–20 h.
 2. **PPTX on real decks:** owned corpus, round-trip checks, fixes; #70, #74, #77; EMF/WMF and SVG.
-   36–64 h.
+   `corpus_media.rs` keeps 3-D models and animation bounce end. 36–64 h.
 3. **Localization:** catalog, system language (#15), zh-Hans, es, fr, de, ja with IME. 27–46 h.
 4. **Output:** vector PDF, printing. 10–16 h.
 5. **Depth that users hit:** font weights (#69), chart data and elements, Animation Pane timeline,
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | PPTX: an owned corpus round-trips SmartArt and OLE kept as XML, audio and video bookmarks and trims, a section with a hidden slide, slide-number and date fields, ink (as freeform lines), 3-D models (`.glb`, including the fallback picture) and animation repeat, bounce end and triggers. Relationship-bearing SmartArt and OLE (#203), playback options (#74) and rewind (#77) stay open |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: PPTX corpus for 3-D models, media bookmarks and animation bounce end |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 30437b15..f2699136 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -58,6 +58,12 @@ fn media_of_shapes(shapes: &[Shape], out: &mut Vec<MediaId>) {
                     out.push(p);
                 }
             }
+            deckcraft_model::ShapeKind::Model3d { media, poster } => {
+                out.push(*media);
+                if let Some(p) = poster {
+                    out.push(*p);
+                }
+            }
             _ => {}
         }
         if let Some(deckcraft_model::Fill::Picture(pf)) = &s.fill {
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..00a3ea4a 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -114,6 +114,7 @@ pub(crate) fn add_shape(s: &mut Session, mut shape: Shape, select: bool) -> Resu
                 ShapeKind::Chart(_) => "Chart".to_string(),
                 ShapeKind::Media(m) if m.video => "Video".to_string(),
                 ShapeKind::Media(_) => "Audio".to_string(),
+                ShapeKind::Model3d { .. } => "3D Model".to_string(),
                 _ if shape.text_box => "TextBox".to_string(),
                 _ => shape
                     .geom
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..c7f7c979 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -1259,7 +1259,12 @@ fn hit_shape(st: &crate::DocState, sh: &Shape, p: Point, tol: f64) -> Option<Hit
                 || sh.ph.is_some()
                 || matches!(
                     sh.kind,
-                    ShapeKind::Picture { .. } | ShapeKind::Table(_) | ShapeKind::Chart(_) | ShapeKind::Media(_) | ShapeKind::Opaque { .. }
+                    ShapeKind::Picture { .. }
+                        | ShapeKind::Table(_)
+                        | ShapeKind::Chart(_)
+                        | ShapeKind::Media(_)
+                        | ShapeKind::Model3d { .. }
+                        | ShapeKind::Opaque { .. }
                 )
                 || (filled && in_geo)
                 || deckcraft_geom::near_path(&geo.outline(), local, tol)
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..aac97e46 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -282,6 +282,13 @@ pub enum ShapeKind {
     Ink {
         strokes: Vec<InkStroke>,
     },
+    /// A 3-D model (`p:contentPart` with a `model3d` relationship, usually a `.glb`).
+    /// `poster` is the fallback picture an `mc:AlternateContent` choice carried for older readers.
+    Model3d {
+        media: MediaId,
+        #[serde(default)]
+        poster: Option<MediaId>,
+    },
     /// Something we read but don't model (SmartArt without fallback, OLE…): its XML is kept and its
     /// fallback picture, if any, is shown.
     Opaque {
@@ -388,6 +395,7 @@ impl Shape {
             ShapeKind::Media(m) if m.video => "video",
             ShapeKind::Media(_) => "audio",
             ShapeKind::Ink { .. } => "ink",
+            ShapeKind::Model3d { .. } => "model",
             ShapeKind::Opaque { .. } => "object",
         }
     }
diff --git a/crates/pptx/src/lib.rs b/crates/pptx/src/lib.rs
index 92274b62..26b527cf 100644
--- a/crates/pptx/src/lib.rs
+++ b/crates/pptx/src/lib.rs
@@ -78,6 +78,7 @@ pub(crate) fn mime_for(name: &str) -> &'static str {
         "wma" => "audio/x-ms-wma",
         "ogg" => "audio/ogg",
         "flac" => "audio/flac",
+        "glb" => "model/gltf-binary",
         "xlsx" => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
         "fntdata" => "application/x-fontdata",
         _ => "application/octet-stream",
diff --git a/crates/pptx/src/opc.rs b/crates/pptx/src/opc.rs
index 4ef21c3d..fca2404f 100644
--- a/crates/pptx/src/opc.rs
+++ b/crates/pptx/src/opc.rs
@@ -27,6 +27,8 @@ pub const NS_A14: &str = "http://schemas.microsoft.com/office/drawing/2010/main"
 
 pub const RT_BASE: &str = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/";
 pub const RT_MEDIA: &str = "http://schemas.microsoft.com/office/2007/relationships/media";
+/// A 3-D model part (`.glb`). Office relationship, not an ECMA-376 base type.
+pub const RT_MODEL3D: &str = "http://schemas.microsoft.com/office/2017/06/relationships/model3d";
 pub const RT_CORE: &str = "http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties";
 
 /// The files of a package, keyed by normalised part name (no leading slash, lowercase).
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..277cd99b 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -119,8 +119,36 @@ pub fn keep_xml(el: &El, ns: &[(String, String)]) -> String {
 /// Namespace prefixes whose `mc:Choice` content we understand.
 const SUPPORTED_MC: [&str; 9] = ["p14", "p15", "p159", "a14", "a16", "p1510", "a15", "c14", "p188"];
 
+/// A relationship to an embedded 3-D model (`.glb`).
+pub(crate) fn is_model3d(rel: &opc::Rel) -> bool {
+    !rel.external && (rel.kind == "model3d" || rel.target.to_ascii_lowercase().ends_with(".glb"))
+}
+
+fn choice_has_model3d(el: &El, rels: &Rels) -> bool {
+    fn rec(el: &El, rels: &Rels, depth: usize) -> bool {
+        if depth > 16 {
+            return false;
+        }
+        if el.is("contentPart")
+            && let Some(id) = el.attr("r:id").filter(|s| !s.is_empty())
+            && rels.get(id).is_some_and(is_model3d)
+        {
+            return true;
+        }
+        el.elements().any(|c| rec(c, rels, depth + 1))
+    }
+    rec(el, rels, 0)
+}
+
 /// Replace every `mc:AlternateContent` by the children of the branch we can read best.
+/// A 3-D model choice is left in place (even when its `Requires` prefix is not one we otherwise
+/// understand) so the shape reader can keep the model and its fallback picture. Ink content parts
+/// still fall through to the fallback picture.
 pub fn resolve_mc(el: &mut El, depth: usize) {
+    resolve_mc_rels(el, depth, None);
+}
+
+fn resolve_mc_rels(el: &mut El, depth: usize, rels: Option<&Rels>) {
     if depth > crate::xml::MAX_DEPTH {
         return;
     }
@@ -129,6 +157,10 @@ pub fn resolve_mc(el: &mut El, depth: usize) {
         for c in std::mem::take(&mut el.children) {
             match c {
                 Node::El(ac) if ac.is("AlternateContent") => {
+                    if rels.is_some_and(|rels| ac.children_named("Choice").any(|ch| choice_has_model3d(ch, rels))) {
+                        out.push(Node::El(ac));
+                        continue;
+                    }
                     let choice = ac.children_named("Choice").find(|ch| {
                         let req_ok = ch.attr("Requires").unwrap_or("").split_whitespace().all(|r| SUPPORTED_MC.contains(&r));
                         // Ink content parts are not modelled; prefer their fallback picture.
@@ -157,13 +189,14 @@ pub fn resolve_mc(el: &mut El, depth: usize) {
         el.children = out;
     }
     for c in el.elements_mut() {
-        resolve_mc(c, depth + 1);
+        resolve_mc_rels(c, depth + 1, rels);
     }
 }
 
 fn load(pkg: &Package, name: &str) -> Option<Doc> {
     let mut d = pkg.xml(name)?;
-    resolve_mc(&mut d.root, 0);
+    let rels = pkg.rels(name);
+    resolve_mc_rels(&mut d.root, 0, Some(&rels));
     Some(d)
 }
 
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index c4b3f77f..1a9750e2 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -1,5 +1,5 @@
 //! Shape trees: `p:sp`, `p:pic`, `p:grpSp`, `p:cxnSp`, `p:graphicFrame` (tables, charts, SmartArt,
-//! OLE and other objects).
+//! OLE and other objects) and `p:contentPart` (3-D models).
 
 use std::collections::{HashMap, HashSet};
 
@@ -70,10 +70,11 @@ pub fn sp_tree(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, tree: &El, depth: us
             "grpSp" => Some(grp(imp, part, ctx, e, depth)),
             "cxnSp" => Some(cxn(imp, part, ctx, e)),
             "graphicFrame" => Some(frame(imp, part, ctx, e, depth)),
-            "contentPart" => {
-                log::warn!("pptx: ink content part in {} not imported", part.name);
+            "contentPart" => content_part(imp, part, ctx, e).or_else(|| {
+                log::warn!("pptx: content part in {} not imported", part.name);
                 None
-            }
+            }),
+            "AlternateContent" => read_model_alternate(imp, part, ctx, e),
             _ => None,
         };
         if let Some(s) = s {
@@ -279,6 +280,58 @@ fn ms(v: Option<&str>) -> u32 {
     v.and_then(|v| v.trim().parse::<f64>().ok()).filter(|v| v.is_finite()).map(|v| v.clamp(0.0, u32::MAX as f64) as u32).unwrap_or(0)
 }
 
+fn find_content_part(el: &El) -> Option<&El> {
+    fn rec(el: &El, depth: usize) -> Option<&El> {
+        if depth > 16 {
+            return None;
+        }
+        if el.is("contentPart") {
+            return Some(el);
+        }
+        el.elements().find_map(|c| rec(c, depth + 1))
+    }
+    rec(el, 0)
+}
+
+/// `p:contentPart` whose relationship is a 3-D model. Other content parts (ink) are left out.
+fn content_part(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El) -> Option<Shape> {
+    let id = e.attr("r:id").filter(|s| !s.is_empty())?;
+    let rel = part.rels.get(id)?;
+    if !super::is_model3d(rel) {
+        return None;
+    }
+    let target = rel.target.clone();
+    let media = imp.media_for(&target).or_else(|| {
+        log::warn!("pptx: 3-D model part missing in {}", part.name);
+        None
+    })?;
+    let mut s = base(imp, part, ctx, e.child("nvContentPartPr"));
+    if let Some(x) = e.child("xfrm") {
+        s.xfrm = Some(dml::xfrm(x).0);
+    }
+    s.kind = ShapeKind::Model3d { media, poster: None };
+    Some(s)
+}
+
+/// A 3-D model wrapped in `mc:AlternateContent`: the model choice, plus the fallback picture.
+/// If the model part is missing, the fallback picture is the shape.
+fn read_model_alternate(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El) -> Option<Shape> {
+    if let Some(content) = e.children_named("Choice").find_map(find_content_part)
+        && let Some(mut s) = content_part(imp, part, ctx, content)
+    {
+        let poster = e.child("Fallback").and_then(|fb| {
+            let mut pics = vec![];
+            fb.find_all("blip", &mut pics);
+            pics.into_iter().find_map(|b| dml::media_ref(imp, part, b))
+        });
+        if let ShapeKind::Model3d { media, .. } = s.kind {
+            s.kind = ShapeKind::Model3d { media, poster };
+        }
+        return Some(s);
+    }
+    e.child("Fallback").and_then(|fb| fb.elements().find(|c| c.is("pic")).map(|p| pic(imp, part, ctx, p)))
+}
+
 fn pic(imp: &mut Imp, part: &Part, ctx: &mut IdCtx, e: &El) -> Shape {
     let mut s = base(imp, part, ctx, e.child("nvPicPr"));
     if let Some(pr) = e.child("spPr") {
diff --git a/crates/pptx/src/read/timing.rs b/crates/pptx/src/read/timing.rs
index 500bb485..19739337 100644
--- a/crates/pptx/src/read/timing.rs
+++ b/crates/pptx/src/read/timing.rs
@@ -139,6 +139,7 @@ pub fn animations(imp: &mut Imp, part: &Part, ctx: &IdCtx, timing: &El, _shapes:
             auto_reverse: c.bool("autoRev").unwrap_or(false),
             smooth_start: c.f64("accel").map(|v| v / 100_000.0).unwrap_or(0.0),
             smooth_end: c.f64("decel").map(|v| v / 100_000.0).unwrap_or(0.0),
+            bounce_end: c.f64("bounceEnd").map(|v| (v / 100_000.0).clamp(0.0, 1.0)).unwrap_or(0.0),
             ..Default::default()
         };
         a.repeat = match c.attr("repeatCount") {
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..48f5991e 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -82,6 +82,7 @@ fn ext_for(content_type: &str, name: &str, data: &[u8]) -> String {
         "audio/x-ms-wma" => "wma",
         "audio/ogg" => "ogg",
         "audio/flac" => "flac",
+        "model/gltf-binary" => "glb",
         _ => "",
     };
     if !by_ct.is_empty() {
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..0e538fbb 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -1,4 +1,4 @@
-//! Shape trees: autoshapes, pictures, groups, connectors, tables, charts, media, ink and kept objects.
+//! Shape trees: autoshapes, pictures, groups, connectors, tables, charts, media, ink, 3-D models and kept objects.
 
 use std::collections::{HashMap, HashSet};
 
@@ -376,6 +376,7 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
             let id = cx.id_for(s);
             media(w, x, o, id, s, m);
         }
+        ShapeKind::Model3d { media, poster } => write_model(w, x, o, cx, s, *media, *poster),
         ShapeKind::Ink { strokes } => {
             // Ink becomes a group of freeform lines.
             let id = cx.id_for(s);
@@ -400,6 +401,64 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
     }
 }
 
+fn model_rel(x: &mut Exp, o: &mut Out, media: deckcraft_model::MediaId) -> Option<String> {
+    if x.p.media(media).is_none_or(|m| m.data.is_empty()) {
+        return None;
+    }
+    x.media_rel(o, media, crate::opc::RT_MODEL3D)
+}
+
+fn write_model_part(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape, rid: &str) {
+    w.open("p:contentPart", A::new().a("r:id", rid));
+    w.open0("p:nvContentPartPr");
+    cnvpr(w, x, o, id, s);
+    w.empty0("p:cNvContentPartPr");
+    w.empty0("p:nvPr");
+    w.close("p:nvContentPartPr");
+    if let Some(xf) = &s.xfrm {
+        dml::xfrm(w, "p:xfrm", xf, None);
+    }
+    w.close("p:contentPart");
+}
+
+fn write_model(
+    w: &mut W,
+    x: &mut Exp,
+    o: &mut Out,
+    cx: &mut Ctx,
+    s: &Shape,
+    media: deckcraft_model::MediaId,
+    poster: Option<deckcraft_model::MediaId>,
+) {
+    let Some(rid) = model_rel(x, o, media) else {
+        log::warn!("pptx: 3-D model '{}' has no embedded part", s.name);
+        return;
+    };
+    let id = cx.id_for(s);
+    let poster = poster.filter(|p| x.p.media(*p).is_some_and(|m| !m.data.is_empty()));
+    let Some(poster) = poster else {
+        write_model_part(w, x, o, id, s, &rid);
+        return;
+    };
+    // Older readers draw the fallback picture; readers that know `am3d` use the model.
+    w.open("mc:AlternateContent", A::new().a("xmlns:mc", NS_MC));
+    w.open("mc:Choice", A::new().a("xmlns:am3d", "http://schemas.microsoft.com/office/drawing/2017/model3d").a("Requires", "am3d"));
+    write_model_part(w, x, o, id, s, &rid);
+    w.close("mc:Choice");
+    w.open0("mc:Fallback");
+    let pic = Shape {
+        id: ShapeId(0),
+        name: s.name.clone(),
+        xfrm: s.xfrm,
+        kind: ShapeKind::Picture { fill: deckcraft_model::style::PictureFill { media: poster, ..Default::default() } },
+        ..Default::default()
+    };
+    let pid = cx.ids.fresh();
+    shape_with_id(w, x, o, cx, &pic, pid);
+    w.close("mc:Fallback");
+    w.close("mc:AlternateContent");
+}
+
 fn ink_shape(st: &deckcraft_model::InkStroke, i: usize) -> Option<Shape> {
     let pts: Vec<(f64, f64)> = st.points.iter().filter(|p| p.0.is_finite() && p.1.is_finite()).map(|p| (p.0, p.1)).collect();
     let (x0, y0) = pts.iter().fold((f64::MAX, f64::MAX), |a, p| (a.0.min(p.0), a.1.min(p.1)));
diff --git a/crates/pptx/src/write/timing.rs b/crates/pptx/src/write/timing.rs
index aa577ca7..bf87353c 100644
--- a/crates/pptx/src/write/timing.rs
+++ b/crates/pptx/src/write/timing.rs
@@ -433,6 +433,9 @@ fn effect_par(w: &mut W, x: &mut Exp, ids: &mut Ids, e: &Eff, first_in_click: bo
     };
     let accel = (a.smooth_start > 0.0).then(|| (a.smooth_start.clamp(0.0, 1.0) * 100_000.0).round() as i64);
     let decel = (a.smooth_end > 0.0).then(|| (a.smooth_end.clamp(0.0, 1.0) * 100_000.0).round() as i64);
+    // `bounceEnd` is a positive percentage (100000 = 100%), same scale as accel/decel. The model stores 0–1.
+    let bounce =
+        (a.bounce_end.is_finite() && a.bounce_end > 0.0).then(|| (a.bounce_end.clamp(0.0, 1.0) * 100_000.0).round() as i64).filter(|n| *n > 0);
     w.open0("p:par");
     w.open(
         "p:cTn",
@@ -444,6 +447,7 @@ fn effect_par(w: &mut W, x: &mut Exp, ids: &mut Ids, e: &Eff, first_in_click: bo
             .o("repeatCount", repeat)
             .o("accel", accel)
             .o("decel", decel)
+            .o("bounceEnd", bounce)
             .t("autoRev", a.auto_reverse)
             .a("fill", "hold")
             .a("grpId", e.grp)
diff --git a/crates/pptx/tests/corpus_media.rs b/crates/pptx/tests/corpus_media.rs
new file mode 100644
index 00000000..26a9539d
--- /dev/null
+++ b/crates/pptx/tests/corpus_media.rs
@@ -0,0 +1,373 @@
+//! Owned corpus: SmartArt and OLE kept as XML, audio and video bookmarks and trims, a section with a
+//! hidden slide, slide-number and date fields, ink, 3-D models, and animation repeat, bounce and triggers.
+//!
+//! Relationship-bearing SmartArt and OLE parts stay with issue #203. Media playback options stay
+//! with #74. Animation rewind (`cTn fill="remove"`) stays with #77. This file does not assert those.
+
+use std::io::{Cursor, Read, Write};
+use std::sync::Arc;
+
+use deckcraft_color::Rgba;
+use deckcraft_geom::Xfrm;
+use deckcraft_model::anim::{AnimClass, Animation};
+use deckcraft_model::text::{Run, RunKind, RunProps, TextBody};
+use deckcraft_model::{Geom, InkStroke, MediaClip, Presentation, Section, Shape, ShapeId, ShapeKind, Slide, SlideId, defaults};
+
+fn png(rgb: [u8; 3]) -> Vec<u8> {
+    let mut out = Cursor::new(vec![]);
+    image::DynamicImage::ImageRgb8(image::RgbImage::from_pixel(4, 4, image::Rgb(rgb))).write_to(&mut out, image::ImageFormat::Png).expect("png");
+    out.into_inner()
+}
+
+fn glb(marker: u8) -> Vec<u8> {
+    let mut v = b"glTF\x02\x00\x00\x00\x0d\x00\x00\x00".to_vec();
+    v.push(marker);
+    v
+}
+
+fn shape(p: &mut Presentation, name: &str, x: f64, y: f64, w: f64, h: f64) -> Shape {
+    Shape { id: ShapeId(p.alloc_id()), name: name.into(), xfrm: Some(Xfrm::new(x, y, w, h)), ..Default::default() }
+}
+
+fn new_slide(p: &mut Presentation, title: &str) -> Slide {
+    let layout = defaults::layout_of_kind(p, deckcraft_model::LayoutType::TitleOnly).unwrap_or_default();
+    let mut s = defaults::new_slide(p, layout);
+    if let Some(t) = s.shapes.first_mut() {
+        t.text = Some(TextBody::from_text(title));
+    }
+    s
+}
+
+fn field(text: &str, kind: &str) -> TextBody {
+    let mut body = TextBody::from_text("");
+    body.paragraphs[0].runs = vec![Run { text: text.into(), props: RunProps::default(), kind: RunKind::Field { field: kind.into() } }];
+    body
+}
+
+const SMARTART: &str = r#"<p:graphicFrame><p:nvGraphicFramePr><p:cNvPr name="Diagram"/><p:cNvGraphicFramePr/><p:nvPr/></p:nvGraphicFramePr><p:xfrm><a:off x="0" y="0"/><a:ext cx="3657600" cy="1828800"/></p:xfrm><a:graphic><a:graphicData uri="http://schemas.openxmlformats.org/drawingml/2006/diagram"><dgm:relIds xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram"/><dgm:pt xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram"><dgm:t>Quarter</dgm:t></dgm:pt></a:graphicData></a:graphic></p:graphicFrame>"#;
+
+const OLE: &str = r#"<p:graphicFrame><p:nvGraphicFramePr><p:cNvPr name="Embedded"/><p:cNvGraphicFramePr/><p:nvPr/></p:nvGraphicFramePr><p:xfrm><a:off x="3810000" y="0"/><a:ext cx="1828800" cy="914400"/></p:xfrm><a:graphic><a:graphicData uri="http://schemas.openxmlformats.org/presentationml/2006/ole"><p:oleObj name="Note" progId="DeckCraft.Note.1"><p:embed/></p:oleObj></a:graphicData></a:graphic></p:graphicFrame>"#;
+
+fn corpus() -> (Presentation, Vec<u8>, Vec<u8>, Vec<u8>) {
+    let mut p = defaults::new_presentation(None);
+    let audio_bytes = b"audio-bytes-deckcraft".to_vec();
+    let video_bytes = b"video-bytes-deckcraft".to_vec();
+    let block = glb(1);
+    let globe = glb(2);
+    let poster = png([20, 80, 160]);
+    let audio = p.add_media("clip.m4a", "audio/mp4", audio_bytes);
+    let video = p.add_media("clip.mp4", "video/mp4", video_bytes);
+    let block_id = p.add_media("block.glb", "model/gltf-binary", block.clone());
+    let globe_id = p.add_media("globe.glb", "model/gltf-binary", globe.clone());
+    let poster_id = p.add_media("globe-poster.png", "image/png", poster.clone());
+
+    let mut objects = new_slide(&mut p, "Objects");
+    let mut diagram = shape(&mut p, "Diagram", 40.0, 80.0, 288.0, 144.0);
+    diagram.kind = ShapeKind::Opaque { xml: SMARTART.into(), preview: None, label: "SmartArt".into() };
+    let mut embedded = shape(&mut p, "Embedded", 340.0, 80.0, 144.0, 72.0);
+    embedded.kind = ShapeKind::Opaque { xml: OLE.into(), preview: None, label: "DeckCraft.Note.1".into() };
+    let mut block_shape = shape(&mut p, "Block", 40.0, 240.0, 120.0, 90.0);
+    block_shape.kind = ShapeKind::Model3d { media: block_id, poster: None };
+    let mut globe_shape = shape(&mut p, "Globe", 180.0, 240.0, 160.0, 120.0);
+    globe_shape.kind = ShapeKind::Model3d { media: globe_id, poster: Some(poster_id) };
+    let mut number = shape(&mut p, "Slide number", 360.0, 240.0, 80.0, 28.0);
+    number.text = Some(field("4", "slidenum"));
+    let mut date = shape(&mut p, "Date", 360.0, 276.0, 160.0, 28.0);
+    date.text = Some(field("14 October 2026", "datetime4"));
+    objects.shapes.extend([diagram, embedded, block_shape, globe_shape, number, date]);
+    p.slides.push(Arc::new(objects));
+
+    let mut media = new_slide(&mut p, "Media");
+    let mut clip = shape(&mut p, "Narration", 40.0, 80.0, 80.0, 80.0);
+    clip.kind = ShapeKind::Media(MediaClip {
+        media: audio,
+        video: false,
+        trim_start_ms: 400,
+        trim_end_ms: 2600,
+        fade_in_ms: 80,
+        fade_out_ms: 120,
+        bookmarks: vec![("Intro".into(), 400), ("Outro".into(), 2200)],
+        volume: 1.0,
+        ..Default::default()
+    });
+    let mut film = shape(&mut p, "Film", 160.0, 80.0, 240.0, 135.0);
+    film.kind = ShapeKind::Media(MediaClip {
+        media: video,
+        video: true,
+        poster: Some(poster_id),
+        trim_start_ms: 250,
+        trim_end_ms: 9000,
+        bookmarks: vec![("Mark".into(), 1500)],
+        volume: 1.0,
+        ..Default::default()
+    });
+    let mut trigger = shape(&mut p, "Trigger", 40.0, 240.0, 100.0, 36.0);
+    trigger.text = Some(TextBody::from_text("Play"));
+    let mut fader = shape(&mut p, "Fader", 160.0, 240.0, 140.0, 60.0);
+    fader.text = Some(TextBody::from_text("Hello"));
+    let trigger_id = trigger.id;
+    let fader_id = fader.id;
+    media.shapes.extend([clip, film, trigger, fader]);
+    media.animations = vec![
+        Animation {
+            shape: fader_id,
+            effect: "fade".into(),
+            duration_ms: 600,
+            repeat: 4,
+            bounce_end: 0.25,
+            trigger: Some(trigger_id),
+            ..Default::default()
+        },
+        Animation { shape: fader_id, class: AnimClass::Emphasis, effect: "pulse".into(), duration_ms: 400, repeat: u32::MAX, ..Default::default() },
+    ];
+    p.slides.push(Arc::new(media));
+
+    let mut aside = new_slide(&mut p, "Aside");
+    aside.hidden = true;
+    let mut ink = shape(&mut p, "Sketch", 48.0, 96.0, 200.0, 80.0);
+    ink.kind = ShapeKind::Ink {
+        strokes: vec![
+            InkStroke {
+                points: vec![(48.0, 100.0, 0.4), (90.0, 140.0, 0.8), (150.0, 110.0, 0.3)],
+                color: Rgba::rgb(20, 20, 20),
+                width: 2.0,
+                highlighter: false,
+            },
+            InkStroke { points: vec![(50.0, 150.0, 1.0), (160.0, 156.0, 1.0)], color: Rgba::rgb(255, 230, 40), width: 12.0, highlighter: true },
+        ],
+    };
+    aside.shapes.push(ink);
+    p.slides.push(Arc::new(aside));
+
+    let ids: Vec<SlideId> = p.slides.iter().map(|s| s.id).collect();
+    let hidden = *ids.last().expect("aside");
+    p.sections = vec![
+        Section { name: "Open".into(), slides: ids.iter().copied().filter(|id| *id != hidden).collect() },
+        Section { name: "Aside".into(), slides: vec![hidden] },
+    ];
+    p.first_slide_number = 4;
+    (p, block, globe, poster)
+}
+
+fn round(p: &Presentation) -> Presentation {
+    let bytes = deckcraft_pptx::export(p).expect("export");
+    deckcraft_pptx::import(&bytes).expect("import")
+}
+
+fn by_name<'a>(p: &'a Presentation, name: &str) -> &'a Shape {
+    let mut found = None;
+    for s in &p.slides {
+        deckcraft_model::walk(&s.shapes, &mut |x, _| {
+            if found.is_none() && x.name == name {
+                found = Some(x);
+            }
+        });
+    }
+    found.unwrap_or_else(|| panic!("no shape {name}"))
+}
+
+fn media_bytes(p: &Presentation, shape: &str) -> Vec<u8> {
+    let id = match &by_name(p, shape).kind {
+        ShapeKind::Model3d { media, .. } | ShapeKind::Media(MediaClip { media, .. }) => *media,
+        other => panic!("{shape} has no media: {other:?}"),
+    };
+    p.media(id).expect("media").data.as_ref().clone()
+}
+
+fn assert_field(p: &Presentation, name: &str, kind: &str, text: &str) {
+    let run = &by_name(p, name).text.as_ref().expect("text").paragraphs[0].runs[0];
+    assert!(matches!(&run.kind, RunKind::Field { field } if field == kind), "{name}: {:?}", run.kind);
+    assert_eq!(run.text, text);
+}
+
+fn assert_ink(s: &Shape) {
+    let ShapeKind::Group { children, .. } = &s.kind else { panic!("ink comes back as a group, got {:?}", s.kind) };
+    assert_eq!(children.len(), 2, "pen and highlighter");
+    assert!(children.iter().all(|c| matches!(c.geom, Geom::Custom { .. })));
+}
+
+#[test]
+fn object_corpus_round_trips() {
+    let (p, block, globe, poster) = corpus();
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let types = zip_text(&bytes, "[Content_Types].xml");
+    assert!(types.contains("model/gltf-binary"), "{types}");
+    assert!(zip_has_payload(&bytes, &block), "block model was not written");
+    assert!(zip_has_payload(&bytes, &globe), "globe model was not written");
+    let once = deckcraft_pptx::import(&bytes).expect("import");
+    let twice = round(&once);
+
+    for q in [&once, &twice] {
+        let diagram = by_name(q, "Diagram");
+        let ShapeKind::Opaque { xml, label, .. } = &diagram.kind else { panic!("{:?}", diagram.kind) };
+        assert_eq!(label, "SmartArt");
+        assert!(xml.contains("Quarter"), "{xml}");
+        assert!(!xml.contains("r:dm"), "diagram parts are not part of this corpus");
+
+        let embedded = by_name(q, "Embedded");
+        let ShapeKind::Opaque { xml, label, .. } = &embedded.kind else { panic!("{:?}", embedded.kind) };
+        assert_eq!(label, "DeckCraft.Note.1");
+        assert!(xml.contains("DeckCraft.Note.1"), "{xml}");
+        assert!(!xml.contains("r:id"), "an embedding part is issue #203");
+
+        let block_shape = by_name(q, "Block");
+        assert!(matches!(block_shape.kind, ShapeKind::Model3d { poster: None, .. }), "{:?}", block_shape.kind);
+        assert_eq!(block_shape.xfrm, Some(Xfrm::new(40.0, 240.0, 120.0, 90.0)));
+        assert_eq!(media_bytes(q, "Block"), block);
+        let ShapeKind::Model3d { media, .. } = &block_shape.kind else { panic!("{:?}", block_shape.kind) };
+        let block_media = q.media(*media).expect("block media");
+        assert_eq!(block_media.content_type, "model/gltf-binary");
+        assert!(block_media.name.to_ascii_lowercase().ends_with(".glb"), "{}", block_media.name);
+
+        let globe_shape = by_name(q, "Globe");
+        let ShapeKind::Model3d { media, poster: Some(poster_media) } = &globe_shape.kind else { panic!("{:?}", globe_shape.kind) };
+        assert_eq!(globe_shape.xfrm, Some(Xfrm::new(180.0, 240.0, 160.0, 120.0)));
+        assert_eq!(q.media(*media).expect("globe").data.as_ref(), globe.as_slice());
+        assert_eq!(q.media(*poster_media).expect("poster").data.as_ref(), poster.as_slice());
+
+        let narration = by_name(q, "Narration");
+        let ShapeKind::Media(m) = &narration.kind else { panic!("{:?}", narration.kind) };
+        assert!(!m.video);
+        assert_eq!(m.trim_start_ms, 400);
+        assert_eq!(m.trim_end_ms, 2600);
+        assert_eq!(m.fade_in_ms, 80);
+        assert_eq!(m.fade_out_ms, 120);
+        assert_eq!(m.bookmarks, vec![("Intro".into(), 400), ("Outro".into(), 2200)]);
+        assert_eq!(q.media(m.media).expect("audio").data.as_ref(), b"audio-bytes-deckcraft".as_slice());
+
+        let film = by_name(q, "Film");
+        let ShapeKind::Media(m) = &film.kind else { panic!("{:?}", film.kind) };
+        assert!(m.video);
+        assert_eq!(m.trim_start_ms, 250);
+        assert_eq!(m.trim_end_ms, 9000);
+        assert_eq!(m.bookmarks, vec![("Mark".into(), 1500)]);
+        assert_eq!(q.media(m.media).expect("video").data.as_ref(), b"video-bytes-deckcraft".as_slice());
+
+        assert_field(q, "Slide number", "slidenum", "4");
+        assert_field(q, "Date", "datetime4", "14 October 2026");
+        assert_eq!(q.first_slide_number, 4);
+
+        assert_eq!(q.sections.iter().map(|s| s.name.as_str()).collect::<Vec<_>>(), ["Open", "Aside"]);
+        let hidden = q.slides.iter().position(|s| s.hidden).expect("a hidden slide");
+        assert_eq!(q.slides.iter().filter(|s| s.hidden).count(), 1);
+        assert!(q.sections[1].slides.contains(&q.slides[hidden].id));
+        assert!(!q.sections[0].slides.contains(&q.slides[hidden].id));
+
+        assert_ink(by_name(q, "Sketch"));
+
+        let timing = q.slides.iter().find(|s| s.animations.iter().any(|a| a.effect == "fade")).expect("timing slide");
+        let fade = timing.animations.iter().find(|a| a.effect == "fade").expect("fade");
+        let pulse = timing.animations.iter().find(|a| a.effect == "pulse").expect("pulse");
+        assert_eq!(fade.repeat, 4);
+        assert!((fade.bounce_end - 0.25).abs() < 1e-9, "{}", fade.bounce_end);
+        assert_eq!(fade.trigger, Some(by_name(q, "Trigger").id));
+        assert_eq!(fade.shape, by_name(q, "Fader").id);
+        assert_eq!(pulse.repeat, u32::MAX);
+        assert_eq!(pulse.class, AnimClass::Emphasis);
+        assert!(pulse.trigger.is_none());
+    }
+}
+
+/// An exported deck with `parts` added (or replaced) and `edit` applied to every XML part.
+fn with_parts(parts: &[(&str, Vec<u8>)], edit: impl Fn(&str, String) -> String) -> Vec<u8> {
+    let base = deckcraft_pptx::export(&defaults::new_presentation(None)).expect("export");
+    let mut z = zip::ZipArchive::new(Cursor::new(base)).expect("zip");
+    let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let o = zip::write::SimpleFileOptions::default();
+    for i in 0..z.len() {
+        let mut f = z.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        if parts.iter().any(|(n, _)| *n == name) {
+            continue;
+        }
+        let mut d = vec![];
+        f.read_to_end(&mut d).expect("read");
+        if name.ends_with(".xml") || name.ends_with(".rels") {
+            d = edit(&name, String::from_utf8(d).expect("utf8")).into_bytes();
+        }
+        out.start_file(name, o).expect("start");
+        out.write_all(&d).expect("write");
+    }
+    for (name, data) in parts {
+        out.start_file(*name, o).expect("start");
+        out.write_all(data).expect("write");
+    }
+    out.finish().expect("finish").into_inner()
+}
+
+fn zip_text(bytes: &[u8], name: &str) -> String {
+    let mut z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut f = z.by_name(name).unwrap_or_else(|_| panic!("no {name}"));
+    let mut d = String::new();
+    f.read_to_string(&mut d).expect("read");
+    d
+}
+
+fn zip_has_payload(bytes: &[u8], payload: &[u8]) -> bool {
+    let mut z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    for i in 0..z.len() {
+        let mut f = z.by_index(i).expect("entry");
+        let mut d = vec![];
+        f.read_to_end(&mut d).expect("read");
+        if d == payload {
+            return true;
+        }
+    }
+    false
+}
+
+#[test]
+fn an_alternate_content_model_keeps_the_glb_and_its_poster() {
+    let model = glb(7);
+    let poster = png([200, 30, 40]);
+    let frame = r#"<mc:AlternateContent xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"><mc:Choice xmlns:am3d="http://schemas.microsoft.com/office/drawing/2017/model3d" Requires="am3d"><p:contentPart r:id="rIdModel"><p:nvContentPartPr><p:cNvPr id="60" name="Model from file"/><p:cNvContentPartPr/><p:nvPr/></p:nvContentPartPr><p:xfrm><a:off x="508000" y="635000"/><a:ext cx="1524000" cy="1143000"/></p:xfrm></p:contentPart></mc:Choice><mc:Fallback><p:pic><p:nvPicPr><p:cNvPr id="61" name="Model poster"/><p:cNvPicPr><a:picLocks noChangeAspect="1"/></p:cNvPicPr><p:nvPr/></p:nvPicPr><p:blipFill><a:blip r:embed="rIdPoster"/><a:stretch><a:fillRect/></a:stretch></p:blipFill><p:spPr><a:xfrm><a:off x="508000" y="635000"/><a:ext cx="1524000" cy="1143000"/></a:xfrm><a:prstGeom prst="rect"><a:avLst/></a:prstGeom></p:spPr></p:pic></mc:Fallback></mc:AlternateContent>"#;
+    let bytes = with_parts(&[("ppt/media/model.glb", model.clone()), ("ppt/media/poster.png", poster.clone())], |name, s| {
+        if name == "ppt/slides/slide1.xml" {
+            s.replacen("</p:spTree>", &format!("{frame}</p:spTree>"), 1)
+        } else if name == "ppt/slides/_rels/slide1.xml.rels" {
+            s.replacen(
+                    "</Relationships>",
+                    r#"<Relationship Id="rIdModel" Type="http://schemas.microsoft.com/office/2017/06/relationships/model3d" Target="../media/model.glb"/><Relationship Id="rIdPoster" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image" Target="../media/poster.png"/></Relationships>"#,
+                    1,
+                )
+        } else {
+            s
+        }
+    });
+    let once = deckcraft_pptx::import(&bytes).expect("import");
+    let twice = round(&once);
+    for q in [&once, &twice] {
+        assert!(q.slides[0].shapes.iter().all(|s| s.name != "Model poster"), "the fallback picture replaced the model");
+        let s = by_name(q, "Model from file");
+        let ShapeKind::Model3d { media, poster: Some(poster_id) } = &s.kind else { panic!("{:?}", s.kind) };
+        assert_eq!(s.xfrm, Some(Xfrm::new(40.0, 50.0, 120.0, 90.0)));
+        let model_item = q.media(*media).expect("glb");
+        assert_eq!(model_item.data.as_ref(), model.as_slice());
+        assert_eq!(model_item.content_type, "model/gltf-binary");
+        assert_eq!(q.media(*poster_id).expect("poster").data.as_ref(), poster.as_slice());
+    }
+}
+
+#[test]
+fn an_ink_content_part_still_uses_its_fallback_picture() {
+    let poster = png([10, 10, 10]);
+    let frame = r#"<mc:AlternateContent xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"><mc:Choice Requires="p14"><p:contentPart r:id="rIdInk"><p:nvContentPartPr><p:cNvPr id="50" name="Ink marks"/><p:cNvContentPartPr/><p:nvPr/></p:nvContentPartPr></p:contentPart></mc:Choice><mc:Fallback><p:pic><p:nvPicPr><p:cNvPr id="51" name="Ink poster"/><p:cNvPicPr/><p:nvPr/></p:nvPicPr><p:blipFill><a:blip r:embed="rIdPoster"/><a:stretch><a:fillRect/></a:stretch></p:blipFill><p:spPr><a:xfrm><a:off x="0" y="0"/><a:ext cx="914400" cy="914400"/></a:xfrm><a:prstGeom prst="rect"><a:avLst/></a:prstGeom></p:spPr></p:pic></mc:Fallback></mc:AlternateContent>"#;
+    let bytes = with_parts(&[("ppt/ink/ink1.xml", b"<ink/>".to_vec()), ("ppt/media/ink-poster.png", poster.clone())], |name, s| {
+        if name == "ppt/slides/slide1.xml" {
+            s.replacen("</p:spTree>", &format!("{frame}</p:spTree>"), 1)
+        } else if name == "ppt/slides/_rels/slide1.xml.rels" {
+            s.replacen(
+                    "</Relationships>",
+                    r#"<Relationship Id="rIdInk" Type="http://schemas.microsoft.com/office/2007/relationships/ink" Target="../ink/ink1.xml"/><Relationship Id="rIdPoster" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image" Target="../media/ink-poster.png"/></Relationships>"#,
+                    1,
+                )
+        } else {
+            s
+        }
+    });
+    let p = deckcraft_pptx::import(&bytes).expect("import");
+    assert!(p.slides[0].shapes.iter().all(|s| s.name != "Ink marks"));
+    let s = by_name(&p, "Ink poster");
+    let ShapeKind::Picture { fill } = &s.kind else { panic!("{:?}", s.kind) };
+    assert_eq!(p.media(fill.media).expect("poster").data.as_ref(), poster.as_slice());
+}
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 8ec5d0f4..ce82c1d7 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -1,6 +1,6 @@
 # Transitions and animations: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** major (transitions measured frame by frame against PowerPoint for Windows' video export and retuned; previous: created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (animation bounce end and repeat round-trip; rewind still #77) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Transitions and animations are what make a deck a presentation, and the part of PowerPoint people
 notice first when it's missing. Scores roll up into [target-app-parity.md](target-app-parity.md)
@@ -65,7 +65,7 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 |---|---|---|
 | Start On Click / With Previous / After Previous, duration, delay | yes | yes |
 | Effect Options (direction, sequence by paragraph) | yes | yes |
-| Effect dialog: sound, after-animation dim/hide, animate text by word/letter, smooth start/end, bounce end, repeat, rewind | yes | partly; rewind lost on PPTX save (#77) |
+| Effect dialog: sound, after-animation dim/hide, animate text by word/letter, smooth start/end, bounce end, repeat, rewind | yes | partly; repeat and bounce end round-trip; rewind lost on PPTX save (#77) |
 | By-paragraph text builds, sub-bullets follow parents | yes | yes |
 | Triggers (on click of a shape) | yes | yes |
 | Triggers on a media bookmark | yes | no |
@@ -83,7 +83,7 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 |---|---|
 | Animation Pane timeline, preview from selected, effect dialog depth | 5–8 |
 | The remaining ~126 effects (most are parameter variations of existing ones) | 3–6 |
-| Rewind and other effect options on round trip (#77) | 1–2 |
+| Rewind on round trip (#77) | 1–2 |
 | Transition sounds | 1–2 |
 | Morph across pictures, `!!` names, align once per transition (#67) | 2–4 |
 | Cloth, paper and particle transitions as real meshes (Curtains, Peel Off, Page Curl, Airplane, Origami, Vortex, Shred, Honeycomb) | 4–8 |
@@ -93,5 +93,6 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Repeat and bounce end round-trip through PPTX; rewind is still lost (#77) |
 | 2026-10-13 | major | Transitions measured frame by frame against PowerPoint's video export and retuned (mean diff 35.7 → 15.0); PowerPoint's XML defaults and option meanings; new options |
 | 2026-10-10 | major | Created: 48/48 transitions, 64 of ~190 animation effects, pane and option depth, estimates |
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..4f7b9448 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (3-D model parts and animation bounce end round-trip; `corpus_media.rs` covers SmartArt and OLE XML, media bookmarks and trims, sections, fields, ink and timing) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -16,7 +16,7 @@ PowerPoint opens and saves; Viewer = opens only).
 
 | Format | PowerPoint | DeckCraft read | DeckCraft write | Fidelity / notes | Tested by |
 |---|---|---|---|---|---|
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); never measured on real decks | `crates/pptx/tests/roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs` (30 tests); opened in PowerPoint by hand 2026-10-06 |
+| `.pptx` presentation | Editor | yes | yes | Broad (see below); never measured on real decks | `crates/pptx/tests/roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs` (30 tests), `corpus_media.rs`; opened in PowerPoint by hand 2026-10-06 |
 | `.potx` template | Editor | yes (as a presentation) | no: written with the `.pptx` content type | `file.saveTemplate` is Save As under another name | none |
 | `.ppsx` slide show | Editor | yes (as a presentation) | no: written as `.pptx` content | Doesn't start in show mode | none |
 | `.pptm` / `.potm` / `.ppsm` macro-enabled | Editor | no | no | Should open and keep `vbaProject.bin` without running it | none |
@@ -47,7 +47,7 @@ PowerPoint opens and saves; Viewer = opens only).
 | WMV | yes (Windows) | embedded, not playable | |
 | Online video (YouTube embeds) | yes | no | Cloud feature |
 | Embedded OLE objects | yes | kept on round trip (opaque), not insertable or editable | `ShapeKind::Opaque` |
-| 3-D models (`.glb`) | yes | no | |
+| 3-D models (`.glb`) | yes | kept | The model part round-trips (`p:contentPart`, including an `mc:AlternateContent` choice and its fallback picture). Not drawn as a mesh and not inserted from the ribbon |
 | Embedded fonts | yes | no | `p:embeddedFontLst` ignored |
 
 ## PPTX coverage (PresentationML / DrawingML)
@@ -74,12 +74,12 @@ the round trip even though DeckCraft doesn't model it.
 | Tables with styles | yes | yes | |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
 | Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
-| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
+| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save. A diagram with no relationship parts keeps its XML; the drawing and data parts are still dropped (#203) |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
 | Ink (`contentPart`) | yes | as a group of freeform lines | PowerPoint sees shapes, not ink |
 | Transitions incl. p14/p15 (Vortex, Morph…) | all 48 | all 48 | `every_transition_kind_round_trips` |
-| Animations: timing tree, build paragraphs, triggers, motion paths | yes (flattened to the Animation Pane list) | yes (rebuilt) | `every_animation_effect_survives`; rewind lost (#77) |
+| Animations: timing tree, build paragraphs, triggers, motion paths | yes (flattened to the Animation Pane list) | yes (rebuilt) | `every_animation_effect_survives`; repeat, triggers and bounce end kept; rewind lost (#77) |
 | Comments: legacy | yes | yes | |
 | Comments: modern threaded (`p188`) | yes | no (written as legacy) | Replies and resolved state lost (#70) |
 | Unknown slide-level elements (`graphicFrame` OLE, extensions, `mc:AlternateContent`) | kept | kept | Rendered as a labelled placeholder with the preview picture when present |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | 3-D models (`.glb`) round-trip, including an alternate-content fallback picture; animation bounce end is read and written (`corpus_media.rs`) |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..6edf56eb 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (owned corpus `corpus_media.rs`: 3-D model parts and animation bounce end round-trip; the real-deck corpus and #70/#74/#77 stay open) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -59,9 +59,13 @@ revision history.
 Detail in [file-format-parity.md](file-format-parity.md).
 
 ### PPTX has never met a corpus of real decks
-- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests) uses decks DeckCraft generates;
-  the 2026-10-07 alpha checklist already listed this as open. No reference renders from PowerPoint
-  exist to compare against.
+- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests, plus `corpus_media.rs`) uses decks
+  DeckCraft generates; the 2026-10-07 alpha checklist already listed this as open. No reference
+  renders from PowerPoint exist to compare against. `corpus_media.rs` opens, saves and reopens
+  SmartArt and OLE kept as XML (no diagram or embedding parts; those stay with #203), audio and
+  video bookmarks and trims, a section holding a hidden slide, slide-number and date fields, ink
+  (saved as freeform lines), `.glb` 3-D models, and animation repeat, bounce end and triggers.
+  Playback options (#74) and rewind (#77) are still lost.
 - **Impact:** the main reason to switch is "open my PowerPoint decks". Fidelity on real decks
   (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is unknown.
 - **Estimate:** 20–35 h: build an owned corpus in `storytold/photocraft-corpus` style (craftrules
@@ -256,6 +260,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Owned corpus `corpus_media.rs`: 3-D model parts and animation bounce end now round-trip. The real-deck corpus and #70/#74/#77 stay open |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..e7ccfe10 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (`corpus_media.rs` keeps 3-D models and animation bounce end; real-deck corpus still open) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -26,8 +26,10 @@ points and lead the beta plan.
 
 1. **Stop losing work and crashing:** land Close's save prompt (#60, PR #75), the Windows GPU
    startup crashes (#40, #59), image paste on Windows/Linux (#53). 6–12 h.
-2. **PPTX on real decks:** build an owned corpus, round-trip checks in CI, fix what breaks;
-   comment threads, media options and rewind on save (#70, #74, #77); EMF/WMF and SVG. 31–55 h.
+2. **PPTX on real decks:** build an owned corpus, round-trip checks in CI, fix what breaks.
+   `corpus_media.rs` keeps SmartArt and OLE XML, media bookmarks and trims, sections, fields, ink,
+   3-D models and animation bounce end. Comment threads, media options and rewind on save
+   (#70, #74, #77), relationship-bearing SmartArt and OLE (#203), and EMF/WMF and SVG are still open. 31–55 h.
 3. **Review the open PRs:** equations (#55), browser print (#66), Morph alignment (#67), macOS
    open-with (#68), font lookup (#80), Ukrainian (#34, after the catalog exists). 4–8 h.
 
@@ -109,5 +111,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Current focus: `corpus_media.rs` keeps 3-D models and animation bounce end; the real-deck corpus stays open |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |

From 6fcf3923704ec75dc980b1f466a64ce7cb55aed8 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:35:26 +0300
Subject: [PATCH 202/376] Lay out notes pages and handouts from their masters

PDF notes pages and the Notes Page view put the slide (keeping its aspect)
and the notes where the notes master's slide-image and body placeholders
are, scaled from the notes size to the paper, and print the master's
header, date, footer and page number. PDF handouts print the handout
master's. Decks without these masters keep the old layout. Stacked on #573.
---
 crates/pdf/src/lib.rs        | 87 ++++++++++++++++++++++++++++++++----
 crates/pdf/src/tests.rs      | 50 +++++++++++++++++++++
 crates/ui-egui/src/sorter.rs | 22 +++++++--
 docs/gaps.md                 | 10 +++--
 4 files changed, 152 insertions(+), 17 deletions(-)

diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index 97eb641b..5e9c6cb9 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -112,10 +112,8 @@ pub fn export(pres: &Presentation, opts: &PdfOptions) -> Result<Vec<u8>> {
     let pages: Vec<Vec<(usize, Rect)>> = match opts.layout {
         PageLayout::Slides => slides.iter().map(|&i| vec![(i, Rect::new(0.0, 0.0, sw, sh))]).collect(),
         PageLayout::Notes => {
-            let (pw, _) = opts.paper;
-            let w = pw - 2.0 * 72.0;
-            let h = w * sh / sw;
-            slides.iter().map(|&i| vec![(i, Rect::new(72.0, 54.0, 72.0 + w, 54.0 + h))]).collect()
+            let b = notes_frames(pres, opts.paper).0;
+            slides.iter().map(|&i| vec![(i, b)]).collect()
         }
         PageLayout::Handouts { per_page } => {
             let boxes = handout_boxes(per_page, opts.paper, sw / sh);
@@ -151,12 +149,11 @@ pub fn export(pres: &Presentation, opts: &PdfOptions) -> Result<Vec<u8>> {
             }
             match opts.layout {
                 PageLayout::Notes => {
-                    if let Some((i, b)) = v.first() {
+                    if let Some((i, _)) = v.first() {
                         let notes = pres.slides[*i].notes_text();
-                        let area = Rect::new(72.0, b.y1 + 36.0, pw - 72.0, ph - 54.0);
-                        ex.paragraphs(&mut s, &notes, area, 12.0);
+                        ex.paragraphs(&mut s, &notes, notes_frames(pres, opts.paper).1, 12.0);
                     }
-                    ex.footer(&mut s, pw, ph, v.first().map(|x| x.0 + 1).unwrap_or(1));
+                    ex.page_texts(&mut s, pres.notes_master.as_deref(), pw, ph, v.first().map(|x| x.0 + 1).unwrap_or(1));
                 }
                 PageLayout::Handouts { per_page } => {
                     if per_page == 3 {
@@ -164,7 +161,7 @@ pub fn export(pres: &Presentation, opts: &PdfOptions) -> Result<Vec<u8>> {
                             ex.note_lines(&mut s, Rect::new(b.x1 + 24.0, b.y0, pw - 54.0, b.y1));
                         }
                     }
-                    ex.footer(&mut s, pw, ph, page_of.get(&v[0].0).map(|p| p + 1).unwrap_or(1));
+                    ex.page_texts(&mut s, pres.handout_master.as_deref(), pw, ph, page_of.get(&v[0].0).map(|p| p + 1).unwrap_or(1));
                 }
                 PageLayout::Slides => {}
             }
@@ -178,6 +175,61 @@ pub fn export(pres: &Presentation, opts: &PdfOptions) -> Result<Vec<u8>> {
     pdf.finish().map_err(|e| PdfError::Write(format!("{e:?}")))
 }
 
+/// A notes-size master's rect of placeholder `kind`, scaled to a page of `paper` points.
+fn master_rect(pres: &Presentation, m: &deckcraft_model::Master, kind: deckcraft_model::PhType, paper: (f64, f64)) -> Option<Rect> {
+    let x = m.shapes.iter().find(|s| s.ph_type() == Some(kind))?.xfrm?;
+    let (kx, ky) = (paper.0 / pres.notes_size.width.max(1.0), paper.1 / pres.notes_size.height.max(1.0));
+    let r = Rect::new(x.x * kx, x.y * ky, (x.x + x.w) * kx, (x.y + x.h) * ky);
+    (r.width() > 1.0 && r.height() > 1.0).then_some(r)
+}
+
+/// A notes page's slide box and notes area on `paper`: where the notes master puts its slide image
+/// and body placeholders, or the default layout when it has none.
+pub fn notes_frames(pres: &Presentation, paper: (f64, f64)) -> (Rect, Rect) {
+    let (pw, ph) = paper;
+    let aspect = pres.slide_size.width.max(1.0) / pres.slide_size.height.max(1.0);
+    let nm = pres.notes_master.as_deref();
+    let slide = match nm.and_then(|m| master_rect(pres, m, deckcraft_model::PhType::SlideImage, paper)) {
+        // The slide keeps its own shape, centred in the frame.
+        Some(f) => {
+            let (w, h) = if f.width() / f.height() > aspect { (f.height() * aspect, f.height()) } else { (f.width(), f.width() / aspect) };
+            Rect::from_center_size(f.center(), (w, h))
+        }
+        None => {
+            let w = pw - 2.0 * 72.0;
+            Rect::new(72.0, 54.0, 72.0 + w, 54.0 + w / aspect)
+        }
+    };
+    let notes = nm
+        .and_then(|m| master_rect(pres, m, deckcraft_model::PhType::Body, paper))
+        .unwrap_or_else(|| Rect::new(72.0, slide.y1 + 36.0, pw - 72.0, ph - 54.0));
+    (slide, notes)
+}
+
+/// The header, date, footer and page-number text a master puts on page `n`, with where it goes
+/// and whether it's right-aligned. Placeholders with no text are left out; the page number is
+/// always `n`.
+pub fn master_texts(pres: &Presentation, m: &deckcraft_model::Master, paper: (f64, f64), n: usize) -> Vec<(Rect, String, bool)> {
+    use deckcraft_model::PhType;
+    let mut out = vec![];
+    for kind in [PhType::Header, PhType::Date, PhType::Footer, PhType::SlideNum] {
+        let Some(r) = master_rect(pres, m, kind, paper) else { continue };
+        let Some(sh) = m.shapes.iter().find(|s| s.ph_type() == Some(kind)) else { continue };
+        let text = if kind == PhType::SlideNum { n.to_string() } else { sh.text.as_ref().map(|t| t.text()).unwrap_or_default().trim().to_string() };
+        if text.is_empty() {
+            continue;
+        }
+        let right = sh
+            .text
+            .as_ref()
+            .and_then(|t| t.paragraphs.first())
+            .and_then(|p| p.props.align)
+            .map_or(matches!(kind, PhType::Date | PhType::SlideNum), |a| a == deckcraft_model::text::Align::Right);
+        out.push((r, text, right));
+    }
+    out
+}
+
 /// Slide boxes for a handout page (portrait paper, half-inch-ish margins).
 pub fn handout_boxes(per_page: u8, paper: (f64, f64), aspect: f64) -> Vec<Rect> {
     let (pw, ph) = paper;
@@ -415,6 +467,23 @@ impl Exporter<'_> {
         s.set_stroke(None);
     }
 
+    /// A notes or handout page's header, date, footer and page number from its master; just the
+    /// page number when the deck has no such master.
+    fn page_texts(&mut self, s: &mut Surface, master: Option<&deckcraft_model::Master>, pw: f64, ph: f64, n: usize) {
+        let Some(m) = master else { return self.footer(s, pw, ph, n) };
+        let Some((font, face)) = self.ui_font() else { return };
+        let size = 9.0;
+        let k = size / face.upem.max(1.0);
+        s.set_fill(Some(grey(0x60, 1.0)));
+        for (r, text, right) in master_texts(self.pres, m, (pw, ph), n) {
+            let line = text.lines().next().unwrap_or("");
+            let w: f64 = line.chars().map(|c| face.advance(face.glyph_for(c)) * k).sum();
+            let x = if right { r.x1 - w } else { r.x0 };
+            let y = r.y0 + (r.height() + size * 0.7) / 2.0;
+            s.draw_text(Point::from_xy(x as f32, y as f32), font.clone(), size as f32, line, false, TextDirection::Auto);
+        }
+        s.set_fill(None);
+    }
     fn footer(&mut self, s: &mut Surface, pw: f64, ph: f64, n: usize) {
         let Some((font, _)) = self.ui_font() else { return };
         s.set_fill(Some(grey(0x60, 1.0)));
diff --git a/crates/pdf/src/tests.rs b/crates/pdf/src/tests.rs
index 305f1457..8cdd074e 100644
--- a/crates/pdf/src/tests.rs
+++ b/crates/pdf/src/tests.rs
@@ -66,3 +66,53 @@ fn handout_boxes_fit_the_paper() {
         }
     }
 }
+
+fn ph(kind: deckcraft_model::PhType, x: f64, y: f64, w: f64, h: f64, text: &str) -> deckcraft_model::Shape {
+    deckcraft_model::Shape {
+        xfrm: Some(deckcraft_model::Xfrm::new(x, y, w, h)),
+        ph: Some(deckcraft_model::Placeholder { kind, ..Default::default() }),
+        text: Some(TextBody::from_text(text)),
+        ..Default::default()
+    }
+}
+
+#[test]
+fn notes_pages_and_handouts_follow_their_masters() {
+    use deckcraft_model::PhType;
+    let mut p = deck(2);
+    let paper = (612.0, 792.0);
+    // No masters: the default layout (slide at the top, one-inch side margins).
+    let (slide, notes) = notes_frames(&p, paper);
+    assert_eq!((slide.x0, slide.y0), (72.0, 54.0));
+    assert!(notes.y0 > slide.y1);
+    // A notes master moves the slide and the notes, scaled from the notes size to the paper.
+    p.notes_size = deckcraft_model::Size::new(612.0, 792.0);
+    p.notes_master = Some(Arc::new(deckcraft_model::Master {
+        shapes: vec![
+            ph(PhType::SlideImage, 100.0, 400.0, 412.0, 300.0, ""),
+            ph(PhType::Body, 50.0, 50.0, 500.0, 300.0, ""),
+            ph(PhType::Header, 0.0, 0.0, 300.0, 30.0, "Q3 review"),
+            ph(PhType::Date, 312.0, 0.0, 300.0, 30.0, ""),
+            ph(PhType::SlideNum, 312.0, 760.0, 300.0, 30.0, "<#>"),
+        ],
+        ..Default::default()
+    }));
+    let (slide, notes) = notes_frames(&p, paper);
+    assert!(slide.y0 >= 400.0 && slide.y1 <= 700.0 + 1e-6 && slide.x0 >= 100.0 - 1e-6, "{slide:?}");
+    assert!(((slide.width() / slide.height()) - p.slide_size.width / p.slide_size.height).abs() < 1e-6);
+    assert_eq!(notes, Rect::new(50.0, 50.0, 550.0, 350.0));
+    let texts = master_texts(&p, p.notes_master.as_deref().unwrap(), paper, 7);
+    let got: Vec<(&str, bool)> = texts.iter().map(|(_, t, r)| (t.as_str(), *r)).collect();
+    assert_eq!(got, [("Q3 review", false), ("7", true)], "empty date left out, number is the page");
+    // Notes pages and handouts export with the masters.
+    for layout in [PageLayout::Notes, PageLayout::Handouts { per_page: 3 }] {
+        if layout != PageLayout::Notes {
+            p.handout_master = Some(Arc::new(deckcraft_model::Master {
+                shapes: vec![ph(PhType::Footer, 0.0, 760.0, 300.0, 30.0, "Confidential")],
+                ..Default::default()
+            }));
+        }
+        let bytes = export(&p, &PdfOptions { layout, ..Default::default() }).unwrap();
+        assert!(bytes.starts_with(b"%PDF"));
+    }
+}
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index dd26dd85..4b2b9e2c 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -121,16 +121,30 @@ pub fn notes_page(app: &mut SlideApp, ui: &mut Ui) {
     let page = Rect::from_center_size(avail.center(), vec2(page_w, page_h));
     ui.painter().rect_filled(page.translate(vec2(2.0, 2.0)), CornerRadius::ZERO, t.shadow);
     ui.painter().rect_filled(page, CornerRadius::ZERO, Color32::WHITE);
-    let sw = page_w * 0.78;
-    let sh = sw * (doc.slide_size.height / doc.slide_size.width.max(1.0)) as f32;
-    let srect = Rect::from_min_size(pos2(page.center().x - sw / 2.0, page.min.y + page_h * 0.08), vec2(sw, sh));
+    // The notes master places the slide, the notes and the header and footer text (in Letter
+    // points, as the PDF notes pages do).
+    let paper = (612.0, 792.0);
+    let k = page_w / paper.0 as f32;
+    let to_screen = |(x0, y0, x1, y1): (f64, f64, f64, f64)| {
+        Rect::from_min_max(page.min + vec2(x0 as f32 * k, y0 as f32 * k), page.min + vec2(x1 as f32 * k, y1 as f32 * k))
+    };
+    let (slide_box, notes_box) = deckcraft_engine::pdf::notes_frames(&doc, paper);
+    let srect = to_screen((slide_box.x0, slide_box.y0, slide_box.x1, slide_box.y1));
+    let sw = srect.width();
+    if let Some(m) = doc.notes_master.as_deref() {
+        for (r, text, right) in deckcraft_engine::pdf::master_texts(&doc, m, paper, idx + 1) {
+            let r = to_screen((r.x0, r.y0, r.x1, r.y1));
+            let (at, align) = if right { (r.right_center(), egui::Align2::RIGHT_CENTER) } else { (r.left_center(), egui::Align2::LEFT_CENTER) };
+            ui.painter().text(at, align, text.lines().next().unwrap_or(""), theme::font(9.0 * k.max(0.8)), Color32::from_gray(96));
+        }
+    }
     let ppp = ui.ctx().pixels_per_point();
     let mut budget = 2;
     if let Some(tex) = app.textures.thumb(ui.ctx(), &doc, idx, (sw * ppp) as u32, &mut budget) {
         ui.painter().image(tex.id(), srect, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
     }
     ui.painter().rect_stroke(srect, CornerRadius::ZERO, Stroke::new(1.0, Color32::GRAY), egui::StrokeKind::Outside);
-    let notes_rect = Rect::from_min_max(pos2(srect.min.x, srect.max.y + 24.0), pos2(srect.max.x, page.max.y - page_h * 0.06));
+    let notes_rect = to_screen((notes_box.x0, notes_box.y0, notes_box.x1, notes_box.y1));
     let mut child = ui.new_child(egui::UiBuilder::new().max_rect(notes_rect));
     let current = st.current_slide().map(|s| s.notes_text()).unwrap_or_default();
     let id = egui::Id::new(("notespage", idx));
diff --git a/docs/gaps.md b/docs/gaps.md
index f9a216ac..2504f4d2 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -162,10 +162,11 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 
 ### Notes and Handout masters
 - **Evidence:** View ▸ Handout Master and View ▸ Notes Master edit both masters (placeholders,
-  background, a slides-per-page preview for handouts) and PPTX keeps them. The notes master's slide
-  image is an empty frame rather than a slide preview, and notes pages and PDF handouts don't take
-  their layout and text from the masters yet.
-- **Estimate:** 2–3 h (notes pages and PDF handouts follow the masters).
+  background, a slides-per-page preview for handouts) and PPTX keeps them. Notes pages (view and
+  PDF) place the slide and notes where the notes master does and print its header, date, footer
+  and page number; PDF handouts print the handout master's. Left: the master's slide image is an
+  empty frame rather than a slide preview, and master text prints in one plain style.
+- **Estimate:** 1–2 h.
 
 ### Edit points, text warp, 3-D
 - **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
@@ -259,6 +260,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Notes pages and PDF handouts follow the notes and handout masters |
 | 2026-10-14 | minor | Notes Master view: the masters gap is now notes pages and PDF handouts following the masters |
 | 2026-10-14 | minor | Handout Master view: the masters gap is now the Notes Master view and handout text in PDF |
 | 2026-10-13 | minor | Owned PPTX corpus for tables, charts, animations, media, sections and masters. Handout-master text is kept; the corpus gap is now a larger set and PowerPoint reference renders |

From 32fcaec29309f740c046492fa8ccad29da26750d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:40:09 +0300
Subject: [PATCH 203/376] Preview the slide in Notes Master view; print master
 text in its own style

Notes Master view draws the current slide inside the slide-image
placeholder. Header, date, footer and page-number text on notes pages
and handouts (PDF and the Notes Page view) uses the placeholder's
resolved font, size, weight, slant and colour, scaled with the page.
Stacked on #577.
---
 crates/pdf/src/lib.rs        | 67 +++++++++++++++++++++++++++++-------
 crates/pdf/src/tests.rs      | 31 ++++++++++++++++-
 crates/ui-egui/src/canvas.rs | 21 +++++++++++
 crates/ui-egui/src/sorter.rs |  5 +--
 docs/gaps.md                 |  8 +++--
 5 files changed, 114 insertions(+), 18 deletions(-)

diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index 5e9c6cb9..c22dfb17 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -206,10 +206,37 @@ pub fn notes_frames(pres: &Presentation, paper: (f64, f64)) -> (Rect, Rect) {
     (slide, notes)
 }
 
-/// The header, date, footer and page-number text a master puts on page `n`, with where it goes
-/// and whether it's right-aligned. Placeholders with no text are left out; the page number is
-/// always `n`.
-pub fn master_texts(pres: &Presentation, m: &deckcraft_model::Master, paper: (f64, f64), n: usize) -> Vec<(Rect, String, bool)> {
+/// How a master's header, date, footer or page number is printed: its own resolved formatting.
+#[derive(Clone, Debug, PartialEq)]
+pub struct TextStyle {
+    pub family: String,
+    /// Points, before scaling to the paper.
+    pub size: f64,
+    pub bold: bool,
+    pub italic: bool,
+    pub color: deckcraft_model::Rgba,
+}
+
+/// The resolved style of placeholder `sh`'s first run (or its paragraph's end properties) on
+/// master `m`: run, list style, master text styles, theme fonts and colours.
+pub fn master_text_style(pres: &Presentation, m: &deckcraft_model::Master, sh: &deckcraft_model::Shape) -> TextStyle {
+    use deckcraft_model::resolve::{self, Ctx};
+    let ctx = Ctx::for_master(pres, m);
+    let para = sh.text.as_ref().and_then(|t| t.paragraphs.first()).cloned().unwrap_or_default();
+    let own = para.runs.first().map(|r| r.props.clone()).unwrap_or_else(|| para.end_props.clone());
+    let r = resolve::run(&ctx, sh, &para, &own);
+    let family = r.font.as_deref().map(|f| if f.starts_with('+') { m.theme.font(f) } else { f.to_string() }).unwrap_or_default();
+    let color = match &r.fill {
+        Some(deckcraft_model::Fill::Solid { color }) => ctx.color(color, None),
+        _ => deckcraft_model::Rgba::rgb(0x60, 0x60, 0x60),
+    };
+    TextStyle { family, size: r.size.unwrap_or(12.0).clamp(1.0, 400.0), bold: r.bold == Some(true), italic: r.italic == Some(true), color }
+}
+
+/// The header, date, footer and page-number text a master puts on page `n`, with where it goes,
+/// whether it's right-aligned and its style. Placeholders with no text are left out; the page
+/// number is always `n`.
+pub fn master_texts(pres: &Presentation, m: &deckcraft_model::Master, paper: (f64, f64), n: usize) -> Vec<(Rect, String, bool, TextStyle)> {
     use deckcraft_model::PhType;
     let mut out = vec![];
     for kind in [PhType::Header, PhType::Date, PhType::Footer, PhType::SlideNum] {
@@ -225,7 +252,10 @@ pub fn master_texts(pres: &Presentation, m: &deckcraft_model::Master, paper: (f6
             .and_then(|t| t.paragraphs.first())
             .and_then(|p| p.props.align)
             .map_or(matches!(kind, PhType::Date | PhType::SlideNum), |a| a == deckcraft_model::text::Align::Right);
-        out.push((r, text, right));
+        let mut style = master_text_style(pres, m, sh);
+        // Sizes scale with the page, as the placeholders do.
+        style.size *= paper.1 / pres.notes_size.height.max(1.0);
+        out.push((r, text, right, style));
     }
     out
 }
@@ -471,18 +501,31 @@ impl Exporter<'_> {
     /// page number when the deck has no such master.
     fn page_texts(&mut self, s: &mut Surface, master: Option<&deckcraft_model::Master>, pw: f64, ph: f64, n: usize) {
         let Some(m) = master else { return self.footer(s, pw, ph, n) };
-        let Some((font, face)) = self.ui_font() else { return };
-        let size = 9.0;
-        let k = size / face.upem.max(1.0);
-        s.set_fill(Some(grey(0x60, 1.0)));
-        for (r, text, right) in master_texts(self.pres, m, (pw, ph), n) {
+        for (r, text, right, st) in master_texts(self.pres, m, (pw, ph), n) {
+            let style = match (st.bold, st.italic) {
+                (true, true) => "Bold Italic",
+                (true, false) => "Bold",
+                (false, true) => "Italic",
+                _ => "Regular",
+            };
+            let family = if st.family.is_empty() { deckcraft_fonts::DEFAULT_FAMILY } else { st.family.as_str() };
+            let face = FontDb::global().face(family, style);
+            let Some(font) = self.font(&face) else { continue };
+            let size = st.size;
+            let k = size / face.upem.max(1.0);
             let line = text.lines().next().unwrap_or("");
             let w: f64 = line.chars().map(|c| face.advance(face.glyph_for(c)) * k).sum();
             let x = if right { r.x1 - w } else { r.x0 };
             let y = r.y0 + (r.height() + size * 0.7) / 2.0;
-            s.draw_text(Point::from_xy(x as f32, y as f32), font.clone(), size as f32, line, false, TextDirection::Auto);
+            let c = st.color;
+            s.set_fill(Some(Fill {
+                paint: krilla::color::rgb::Color::new(c.r, c.g, c.b).into(),
+                opacity: NormalizedF32::new(f32::from(c.a) / 255.0).unwrap_or(NormalizedF32::ONE),
+                ..Default::default()
+            }));
+            s.draw_text(Point::from_xy(x as f32, y as f32), font, size as f32, line, false, TextDirection::Auto);
+            s.set_fill(None);
         }
-        s.set_fill(None);
     }
     fn footer(&mut self, s: &mut Surface, pw: f64, ph: f64, n: usize) {
         let Some((font, _)) = self.ui_font() else { return };
diff --git a/crates/pdf/src/tests.rs b/crates/pdf/src/tests.rs
index 8cdd074e..40a6afef 100644
--- a/crates/pdf/src/tests.rs
+++ b/crates/pdf/src/tests.rs
@@ -102,7 +102,7 @@ fn notes_pages_and_handouts_follow_their_masters() {
     assert!(((slide.width() / slide.height()) - p.slide_size.width / p.slide_size.height).abs() < 1e-6);
     assert_eq!(notes, Rect::new(50.0, 50.0, 550.0, 350.0));
     let texts = master_texts(&p, p.notes_master.as_deref().unwrap(), paper, 7);
-    let got: Vec<(&str, bool)> = texts.iter().map(|(_, t, r)| (t.as_str(), *r)).collect();
+    let got: Vec<(&str, bool)> = texts.iter().map(|(_, t, r, _)| (t.as_str(), *r)).collect();
     assert_eq!(got, [("Q3 review", false), ("7", true)], "empty date left out, number is the page");
     // Notes pages and handouts export with the masters.
     for layout in [PageLayout::Notes, PageLayout::Handouts { per_page: 3 }] {
@@ -116,3 +116,32 @@ fn notes_pages_and_handouts_follow_their_masters() {
         assert!(bytes.starts_with(b"%PDF"));
     }
 }
+
+#[test]
+fn master_text_keeps_its_own_formatting() {
+    use deckcraft_model::text::RunProps;
+    use deckcraft_model::{ColorRef, Fill, PhType, Rgba};
+    let mut p = deck(1);
+    p.notes_size = deckcraft_model::Size::new(612.0, 792.0);
+    let mut header = ph(PhType::Header, 0.0, 0.0, 300.0, 30.0, "Board pack");
+    if let Some(run) = header.text.as_mut().and_then(|t| t.paragraphs.first_mut()).and_then(|p| p.runs.first_mut()) {
+        run.props = RunProps {
+            size: Some(20.0),
+            bold: Some(true),
+            fill: Some(Fill::solid(ColorRef::rgb(Rgba::rgb(200, 0, 0)))),
+            font: Some("+mj-lt".into()),
+            ..Default::default()
+        };
+    }
+    let m = deckcraft_model::Master { shapes: vec![header, ph(PhType::Footer, 0.0, 760.0, 300.0, 30.0, "plain")], ..Default::default() };
+    let texts = master_texts(&p, &m, (612.0, 792.0), 1);
+    let st = &texts[0].3;
+    assert_eq!((st.size, st.bold, st.italic, st.color), (20.0, true, false, Rgba::rgb(200, 0, 0)));
+    assert_eq!(st.family, m.theme.font("+mj-lt"), "theme font resolved");
+    // Unstyled text falls back through the master's styles; sizes scale with the paper.
+    let half = master_texts(&p, &m, (306.0, 396.0), 1);
+    assert!((half[0].3.size - 10.0).abs() < 1e-9);
+    assert!(texts[1].3.size > 0.0 && !texts[1].3.bold);
+    p.notes_master = Some(Arc::new(m));
+    assert!(export(&p, &PdfOptions { layout: PageLayout::Notes, ..Default::default() }).unwrap().starts_with(b"%PDF"));
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 0d5166e1..46453980 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -139,6 +139,27 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     }
     app.perf.render_ms = app.textures.last_render_ms;
     media_frames(app, &painter, xf);
+    // Notes Master view: the current slide inside the slide-image placeholder, as in PowerPoint.
+    let notes_preview = app.session.active().filter(|d| d.selection.target == Target::NotesMaster).and_then(|d| {
+        let frame = d.doc.notes_master.as_ref()?.shapes.iter().find(|s| s.ph_type() == Some(deckcraft_model::PhType::SlideImage))?.xfrm?;
+        Some((d.doc.clone(), d.selection.slide.min(d.doc.slides.len().saturating_sub(1)), frame))
+    });
+    if let Some((doc, idx, f)) = notes_preview
+        && f.w > 1.0
+        && f.h > 1.0
+    {
+        let aspect = doc.slide_size.width / doc.slide_size.height.max(1.0);
+        let (w, h) = if f.w / f.h > aspect { (f.h * aspect, f.h) } else { (f.w, f.w / aspect) };
+        let (x, y) = (f.x + (f.w - w) / 2.0, f.y + (f.h - h) / 2.0);
+        let r = Rect::from_min_size(
+            pos2(slide_rect.min.x + x as f32 * scale, slide_rect.min.y + y as f32 * scale),
+            vec2(w as f32 * scale, h as f32 * scale),
+        );
+        let mut budget = 2;
+        if let Some(tex) = app.textures.thumb(ui.ctx(), &doc, idx, (r.width() * ppp).round().max(1.0) as u32, &mut budget) {
+            painter.image(tex.id(), r, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
+        }
+    }
     if let Some(d) = app.session.active().filter(|d| d.selection.target == Target::Handout) {
         // Where the slides go on a printed handout, as in PowerPoint's preview.
         let (n, s) = (d.doc.notes_size, d.doc.slide_size);
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index 4b2b9e2c..2b426669 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -132,10 +132,11 @@ pub fn notes_page(app: &mut SlideApp, ui: &mut Ui) {
     let srect = to_screen((slide_box.x0, slide_box.y0, slide_box.x1, slide_box.y1));
     let sw = srect.width();
     if let Some(m) = doc.notes_master.as_deref() {
-        for (r, text, right) in deckcraft_engine::pdf::master_texts(&doc, m, paper, idx + 1) {
+        for (r, text, right, st) in deckcraft_engine::pdf::master_texts(&doc, m, paper, idx + 1) {
             let r = to_screen((r.x0, r.y0, r.x1, r.y1));
             let (at, align) = if right { (r.right_center(), egui::Align2::RIGHT_CENTER) } else { (r.left_center(), egui::Align2::LEFT_CENTER) };
-            ui.painter().text(at, align, text.lines().next().unwrap_or(""), theme::font(9.0 * k.max(0.8)), Color32::from_gray(96));
+            let c = Color32::from_rgba_unmultiplied(st.color.r, st.color.g, st.color.b, st.color.a);
+            ui.painter().text(at, align, text.lines().next().unwrap_or(""), theme::font((st.size as f32 * k).max(6.0)), c);
         }
     }
     let ppp = ui.ctx().pixels_per_point();
diff --git a/docs/gaps.md b/docs/gaps.md
index 2504f4d2..0ed1400e 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -164,9 +164,10 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 - **Evidence:** View ▸ Handout Master and View ▸ Notes Master edit both masters (placeholders,
   background, a slides-per-page preview for handouts) and PPTX keeps them. Notes pages (view and
   PDF) place the slide and notes where the notes master does and print its header, date, footer
-  and page number; PDF handouts print the handout master's. Left: the master's slide image is an
-  empty frame rather than a slide preview, and master text prints in one plain style.
-- **Estimate:** 1–2 h.
+  and page number in their own fonts, sizes and colours; PDF handouts print the handout master's.
+  Notes Master view previews the slide in its slide-image placeholder. Left: master text is one
+  line per placeholder (no wrapping, no mixed formatting within it).
+- **Estimate:** 1 h.
 
 ### Edit points, text warp, 3-D
 - **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
@@ -260,6 +261,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Notes Master slide preview; master header/footer text keeps its formatting |
 | 2026-10-14 | minor | Notes pages and PDF handouts follow the notes and handout masters |
 | 2026-10-14 | minor | Notes Master view: the masters gap is now notes pages and PDF handouts following the masters |
 | 2026-10-14 | minor | Handout Master view: the masters gap is now the Notes Master view and handout text in PDF |

From 07d12ed8d994acef64ff131ffd9b2ec208ac20c2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:43:00 +0300
Subject: [PATCH 204/376] Metafile: EMF+ images, text, gradient brushes and
 clipping

Builds on the EMF+ only reader: bitmap images (raw pixel formats and
compressed PNG/JPEG payloads) through DrawImage and DrawImagePoints,
DrawString and character-code DrawDriverString, hatch, texture, linear and
path gradient brushes, clip rectangles, paths and regions, and objects
split across several records.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 Cargo.lock                     |   1 +
 crates/metafile/Cargo.toml     |   1 +
 crates/metafile/src/canvas.rs  |  74 +++
 crates/metafile/src/clip.rs    | 251 +++++++++
 crates/metafile/src/emfplus.rs | 942 ++++++++++++++++++++++++++++-----
 crates/metafile/src/lib.rs     |   1 +
 crates/metafile/src/tests.rs   | 160 ++++++
 7 files changed, 1299 insertions(+), 131 deletions(-)
 create mode 100644 crates/metafile/src/clip.rs

diff --git a/Cargo.lock b/Cargo.lock
index 4044fce6..434fd547 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1050,6 +1050,7 @@ dependencies = [
 name = "deckcraft-metafile"
 version = "0.6.1"
 dependencies = [
+ "image",
  "kurbo",
  "thiserror 2.0.21",
 ]
diff --git a/crates/metafile/Cargo.toml b/crates/metafile/Cargo.toml
index 63f7ee77..1b564539 100644
--- a/crates/metafile/Cargo.toml
+++ b/crates/metafile/Cargo.toml
@@ -11,3 +11,4 @@ workspace = true
 [dependencies]
 kurbo = { workspace = true }
 thiserror = { workspace = true }
+image = { workspace = true }
diff --git a/crates/metafile/src/canvas.rs b/crates/metafile/src/canvas.rs
index 99f42071..ddb4b299 100644
--- a/crates/metafile/src/canvas.rs
+++ b/crates/metafile/src/canvas.rs
@@ -17,6 +17,8 @@ pub(crate) const PS_NULL: u32 = 5;
 /// Pen style bits; the rest of the style word holds end-cap, join and type flags.
 pub(crate) const PS_STYLE_MASK: u32 = 0x0F;
 pub(crate) const BS_SOLID: u32 = 0;
+/// Cells on the longer side of a computed (gradient or texture) fill tile.
+const SHADE_RES: usize = 128;
 pub(crate) const BS_NULL: u32 = 1;
 pub(crate) const BS_HATCHED: u32 = 2;
 /// BS_PATTERN, BS_DIBPATTERN and BS_DIBPATTERNPT: the brush paints a bitmap tile.
@@ -304,6 +306,8 @@ pub(crate) struct Canvas {
     in_path: bool,
     path: Vec<Op>,
     full: bool,
+    /// Device clip rectangle `[l, t, r, b]` applied to everything drawn (EMF+ sets it).
+    clip: Option<[f64; 4]>,
 }
 
 impl Canvas {
@@ -327,6 +331,7 @@ impl Canvas {
             in_path: false,
             path: Vec::new(),
             full: false,
+            clip: None,
         }
     }
 
@@ -336,6 +341,17 @@ impl Canvas {
     }
 
     fn push(&mut self, raw: Raw) {
+        match self.clip {
+            None => self.push_raw(raw),
+            Some(c) => {
+                for r in crate::clip::clip_raw(raw, c) {
+                    self.push_raw(r);
+                }
+            }
+        }
+    }
+
+    fn push_raw(&mut self, raw: Raw) {
         let cost = match &raw {
             Raw::Path { ops, .. } => ops.len() * std::mem::size_of::<Op>(),
             // A tile shared with its brush is counted once (by the brush); one made for this fill
@@ -456,6 +472,64 @@ impl Canvas {
         self.brush = brush;
     }
 
+    /// Sets the device clip rectangle `[l, t, r, b]` (None: unclipped).
+    pub fn set_clip(&mut self, clip: Option<[f64; 4]>) {
+        self.clip = clip;
+    }
+
+    /// Logical to device as one affine transform (the mapping is affine).
+    pub fn device_affine(&self) -> Xform {
+        let o = self.map.device((0.0, 0.0));
+        let x = self.map.device((1.0, 0.0));
+        let y = self.map.device((0.0, 1.0));
+        [x.0 - o.0, x.1 - o.1, y.0 - o.0, y.1 - o.1, o.0, o.1]
+    }
+
+    /// Text colour, font and alignment set directly (EMF+ strings name their own font and brush);
+    /// the background is transparent.
+    pub fn set_text_style(&mut self, color: [u8; 4], font: LogFont, align: u32) {
+        self.text.color = color;
+        self.text.bk_opaque = false;
+        self.text.align = align;
+        self.text.font = Some(Arc::new(font));
+    }
+
+    /// Fills logical `ops` with a ready-made tile, laid from the device origin.
+    pub fn tile_shape(&mut self, ops: &[Op], tile: Arc<RawTile>) {
+        let dev: Vec<Op> = ops.iter().map(|o| self.map_op(*o)).collect();
+        if dev.len() >= 2 {
+            let even_odd = self.even_odd;
+            self.push(Raw::Pattern { ops: dev, even_odd, tile });
+        }
+    }
+
+    /// Fills logical `ops` with a colour computed per device point (gradients, textures): a tile
+    /// of at most [`SHADE_RES`] cells on the longer side, laid out so that its one repeat covers
+    /// the shape.
+    pub fn shade_shape(&mut self, ops: &[Op], shade: &dyn Fn(P) -> [u8; 4]) {
+        let dev: Vec<Op> = ops.iter().map(|o| self.map_op(*o)).collect();
+        let Some([l, t, r, b]) = crate::clip::ops_bbox(&dev) else { return };
+        let side = (r - l).max(b - t);
+        if dev.len() < 2 || !(side.is_finite() && side > 0.0) {
+            return;
+        }
+        let cell = side / SHADE_RES as f64;
+        let w = (((r - l) / cell).ceil() as usize + 1).clamp(1, SHADE_RES + 1);
+        let h = (((b - t) / cell).ceil() as usize + 1).clamp(1, SHADE_RES + 1);
+        let (pw, ph) = (w as f64 * cell, h as f64 * cell);
+        let mut px = Vec::with_capacity(w * h * 4);
+        for j in 0..h {
+            // The device position this tile row stands for inside the shape's box.
+            let y = t + (j as f64 * cell - t).rem_euclid(ph) + cell / 2.0;
+            for i in 0..w {
+                let x = l + (i as f64 * cell - l).rem_euclid(pw) + cell / 2.0;
+                px.extend_from_slice(&shade((x, y)));
+            }
+        }
+        let even_odd = self.even_odd;
+        self.push(Raw::Pattern { ops: dev, even_odd, tile: Arc::new(RawTile { w, h, px, cell }) });
+    }
+
     /// Pushes the drawing state. Past [`MAX_STACK`] levels the parse stops, since later restores
     /// could no longer match the file.
     pub fn save_dc(&mut self) {
diff --git a/crates/metafile/src/clip.rs b/crates/metafile/src/clip.rs
new file mode 100644
index 00000000..b0db77c3
--- /dev/null
+++ b/crates/metafile/src/clip.rs
@@ -0,0 +1,251 @@
+//! Clipping drawn output to a device rectangle (EMF+ clip rectangles, paths and regions are
+//! reduced to their bounding rectangle). Shapes wholly inside pass unchanged; shapes crossing the
+//! edge are flattened and cut: fills with Sutherland–Hodgman per subpath, outlines with
+//! Liang–Barsky per segment. Bitmaps are cropped and text gets a clip rectangle.
+
+use crate::canvas::Raw;
+use crate::dib::Rgba;
+use crate::geom::{Op, P};
+
+/// Line segments per Bézier when a crossing shape is flattened.
+const CURVE_STEPS: usize = 16;
+
+/// The bounding box `[l, t, r, b]` of the points in `ops` (control points included).
+pub(crate) fn ops_bbox(ops: &[Op]) -> Option<[f64; 4]> {
+    let mut b: Option<[f64; 4]> = None;
+    let mut add = |p: P| {
+        let v = b.get_or_insert([p.0, p.1, p.0, p.1]);
+        *v = [v[0].min(p.0), v[1].min(p.1), v[2].max(p.0), v[3].max(p.1)];
+    };
+    for op in ops {
+        match *op {
+            Op::M(p) | Op::L(p) => add(p),
+            Op::C(a, c, d) => {
+                add(a);
+                add(c);
+                add(d);
+            }
+            Op::Z => {}
+        }
+    }
+    b
+}
+
+pub(crate) fn intersect(a: [f64; 4], b: [f64; 4]) -> [f64; 4] {
+    let r = [a[0].max(b[0]), a[1].max(b[1]), a[2].min(b[2]), a[3].min(b[3])];
+    // An empty intersection stays empty (zero size) so it clips everything away.
+    if r[2] < r[0] || r[3] < r[1] { [r[0], r[1], r[0], r[1]] } else { r }
+}
+
+fn inside(b: [f64; 4], c: [f64; 4]) -> bool {
+    b[0] >= c[0] && b[1] >= c[1] && b[2] <= c[2] && b[3] <= c[3]
+}
+
+fn disjoint(b: [f64; 4], c: [f64; 4]) -> bool {
+    b[2] < c[0] || b[0] > c[2] || b[3] < c[1] || b[1] > c[3] || c[2] <= c[0] || c[3] <= c[1]
+}
+
+/// Clips one drawn item; a shape that is both filled and stroked comes back as two items.
+pub(crate) fn clip_raw(raw: Raw, c: [f64; 4]) -> Vec<Raw> {
+    match raw {
+        Raw::Path { ops, fill, stroke, even_odd } => {
+            let Some(b) = ops_bbox(&ops) else { return Vec::new() };
+            if inside(b, c) {
+                return vec![Raw::Path { ops, fill, stroke, even_odd }];
+            }
+            if disjoint(b, c) {
+                return Vec::new();
+            }
+            let subs = flatten(&ops);
+            let mut out = Vec::new();
+            if fill.is_some() {
+                let f = clip_fill(&subs, c);
+                if !f.is_empty() {
+                    out.push(Raw::Path { ops: f, fill, stroke: None, even_odd });
+                }
+            }
+            if stroke.is_some() {
+                let s = clip_stroke(&subs, c);
+                if !s.is_empty() {
+                    out.push(Raw::Path { ops: s, fill: None, stroke, even_odd });
+                }
+            }
+            out
+        }
+        Raw::Pattern { ops, even_odd, tile } => {
+            let Some(b) = ops_bbox(&ops) else { return Vec::new() };
+            if inside(b, c) {
+                return vec![Raw::Pattern { ops, even_odd, tile }];
+            }
+            if disjoint(b, c) {
+                return Vec::new();
+            }
+            let f = clip_fill(&flatten(&ops), c);
+            if f.is_empty() { Vec::new() } else { vec![Raw::Pattern { ops: f, even_odd, tile }] }
+        }
+        Raw::Bitmap { rect, img } => crop(rect, img, c).map(|(rect, img)| vec![Raw::Bitmap { rect, img }]).unwrap_or_default(),
+        Raw::Text(mut t) => {
+            let cur = t.clip.map_or(c, |[a, b, d, e]| intersect(c, [f64::from(a), f64::from(b), f64::from(d), f64::from(e)]));
+            t.clip = Some(cur.map(|v| v as f32));
+            vec![Raw::Text(t)]
+        }
+    }
+}
+
+/// Subpaths as point lists with their closed flag.
+fn flatten(ops: &[Op]) -> Vec<(Vec<P>, bool)> {
+    let mut subs: Vec<(Vec<P>, bool)> = Vec::new();
+    for op in ops {
+        match *op {
+            Op::M(p) => subs.push((vec![p], false)),
+            Op::L(p) => match subs.last_mut() {
+                Some(s) => s.0.push(p),
+                None => subs.push((vec![p], false)),
+            },
+            Op::C(a, b, d) => {
+                let Some(s) = subs.last_mut() else { continue };
+                let Some(&p0) = s.0.last() else { continue };
+                for i in 1..=CURVE_STEPS {
+                    let t = i as f64 / CURVE_STEPS as f64;
+                    let u = 1.0 - t;
+                    let k = [u * u * u, 3.0 * u * u * t, 3.0 * u * t * t, t * t * t];
+                    s.0.push((k[0] * p0.0 + k[1] * a.0 + k[2] * b.0 + k[3] * d.0, k[0] * p0.1 + k[1] * a.1 + k[2] * b.1 + k[3] * d.1));
+                }
+            }
+            Op::Z => {
+                if let Some(s) = subs.last_mut() {
+                    s.1 = true;
+                    // Drawing after a close starts from the subpath's first point.
+                    let first = s.0.first().copied();
+                    if let Some(f) = first {
+                        subs.push((vec![f], false));
+                    }
+                }
+            }
+        }
+    }
+    subs.retain(|s| s.0.len() > 1);
+    subs
+}
+
+fn clip_fill(subs: &[(Vec<P>, bool)], c: [f64; 4]) -> Vec<Op> {
+    let mut ops = Vec::new();
+    for (pts, _) in subs {
+        let mut poly = pts.clone();
+        // Left, top, right, bottom edges in turn.
+        for edge in 0..4 {
+            let keep = |p: P| match edge {
+                0 => p.0 >= c[0],
+                1 => p.1 >= c[1],
+                2 => p.0 <= c[2],
+                _ => p.1 <= c[3],
+            };
+            let cut = |a: P, b: P| {
+                let t = match edge {
+                    0 => (c[0] - a.0) / (b.0 - a.0),
+                    1 => (c[1] - a.1) / (b.1 - a.1),
+                    2 => (c[2] - a.0) / (b.0 - a.0),
+                    _ => (c[3] - a.1) / (b.1 - a.1),
+                };
+                (a.0 + (b.0 - a.0) * t, a.1 + (b.1 - a.1) * t)
+            };
+            let mut next = Vec::with_capacity(poly.len() + 4);
+            for i in 0..poly.len() {
+                let (a, b) = (poly[(i + poly.len() - 1) % poly.len()], poly[i]);
+                match (keep(a), keep(b)) {
+                    (true, true) => next.push(b),
+                    (true, false) => next.push(cut(a, b)),
+                    (false, true) => {
+                        next.push(cut(a, b));
+                        next.push(b);
+                    }
+                    (false, false) => {}
+                }
+            }
+            poly = next;
+            if poly.is_empty() {
+                break;
+            }
+        }
+        if poly.len() >= 3 {
+            ops.push(Op::M(poly[0]));
+            ops.extend(poly[1..].iter().map(|p| Op::L(*p)));
+            ops.push(Op::Z);
+        }
+    }
+    ops
+}
+
+fn clip_stroke(subs: &[(Vec<P>, bool)], c: [f64; 4]) -> Vec<Op> {
+    let mut ops = Vec::new();
+    for (pts, closed) in subs {
+        let mut pts = pts.clone();
+        if *closed && let Some(&f) = pts.first() {
+            pts.push(f);
+        }
+        let mut last: Option<P> = None;
+        for w in pts.windows(2) {
+            let Some((a, b)) = segment(w[0], w[1], c) else {
+                last = None;
+                continue;
+            };
+            if last != Some(a) {
+                ops.push(Op::M(a));
+            }
+            ops.push(Op::L(b));
+            last = Some(b);
+        }
+    }
+    ops
+}
+
+/// Liang–Barsky: the part of segment `a`–`b` inside `c`.
+fn segment(a: P, b: P, c: [f64; 4]) -> Option<(P, P)> {
+    let (dx, dy) = (b.0 - a.0, b.1 - a.1);
+    let (mut t0, mut t1) = (0.0f64, 1.0f64);
+    for (p, q) in [(-dx, a.0 - c[0]), (dx, c[2] - a.0), (-dy, a.1 - c[1]), (dy, c[3] - a.1)] {
+        if p == 0.0 {
+            if q < 0.0 {
+                return None;
+            }
+        } else {
+            let r = q / p;
+            if p < 0.0 {
+                t0 = t0.max(r);
+            } else {
+                t1 = t1.min(r);
+            }
+        }
+    }
+    (t0 <= t1).then_some(((a.0 + dx * t0, a.1 + dy * t0), (a.0 + dx * t1, a.1 + dy * t1)))
+}
+
+/// Crops a bitmap drawn into `rect` = `[x, y, w, h]` (device, positive extents) to `c`.
+fn crop(rect: [f64; 4], img: Rgba, c: [f64; 4]) -> Option<([f64; 4], Rgba)> {
+    let [x, y, w, h] = rect;
+    let b = [x, y, x + w, y + h];
+    if inside(b, c) {
+        return Some((rect, img));
+    }
+    if disjoint(b, c) || w <= 0.0 || h <= 0.0 || img.w == 0 || img.h == 0 {
+        return None;
+    }
+    let i = intersect(b, c);
+    let (kx, ky) = (img.w as f64 / w, img.h as f64 / h);
+    let x0 = (((i[0] - x) * kx).floor().max(0.0) as usize).min(img.w);
+    let x1 = (((i[2] - x) * kx).ceil().max(0.0) as usize).min(img.w);
+    let y0 = (((i[1] - y) * ky).floor().max(0.0) as usize).min(img.h);
+    let y1 = (((i[3] - y) * ky).ceil().max(0.0) as usize).min(img.h);
+    if x1 <= x0 || y1 <= y0 {
+        return None;
+    }
+    let mut px = Vec::with_capacity((x1 - x0) * (y1 - y0) * 4);
+    for row in y0..y1 {
+        // Rows are top-down unless the image says otherwise.
+        let r = if img.bottom_up { img.h - 1 - row } else { row };
+        let s = (r * img.w + x0) * 4;
+        px.extend_from_slice(img.px.get(s..s + (x1 - x0) * 4)?);
+    }
+    let out = [x + x0 as f64 / kx, y + y0 as f64 / ky, (x1 - x0) as f64 / kx, (y1 - y0) as f64 / ky];
+    Some((out, Rgba { w: x1 - x0, h: y1 - y0, bottom_up: false, px }))
+}
diff --git a/crates/metafile/src/emfplus.rs b/crates/metafile/src/emfplus.rs
index 3aef2842..465f2a1f 100644
--- a/crates/metafile/src/emfplus.rs
+++ b/crates/metafile/src/emfplus.rs
@@ -2,14 +2,26 @@
 //!
 //! Most EMF+ files are *dual*: the same picture is also drawn with plain EMF records, which
 //! [`crate::emf`] already plays, so this reader ignores their EMF+ part. An *EMF+ only* file has
-//! nothing else to draw, so it used to show as an empty picture; for those this reader plays the
-//! vector records: solid brushes and pens, paths, rectangles, polygons, lines, ellipses and
-//! Béziers, under the world and page transforms, save/restore and containers. Images, text,
-//! gradient brushes, clipping and arcs are not drawn yet.
+//! nothing else to draw; for those this reader plays the records:
+//! - brushes (solid, hatch, texture, linear and path gradients), pens, paths, images, fonts,
+//!   string formats and regions, including objects split across several records;
+//! - rectangles, polygons, lines, ellipses, paths and Béziers;
+//! - bitmaps (raw pixel formats, and PNG/JPEG/GIF/TIFF/BMP payloads) and strings (DrawString,
+//!   DrawDriverString with character codes);
+//! - world and page transforms, save/restore and containers;
+//! - clipping to rectangles, and to the bounding rectangle of clip paths and regions.
+//!
+//! Not drawn yet: nested metafile images, glyph-index driver strings, arcs and pies, image
+//! attributes, and region combinations other than intersect and union.
+
+use std::sync::Arc;
 
 use crate::bytes::Bytes;
-use crate::canvas::{BS_NULL, BS_SOLID, Brush, Canvas, PS_NULL, Pen, Xform, mul};
+use crate::canvas::{BS_NULL, BS_SOLID, Brush, Canvas, LogFont, PS_NULL, Pen, RawTile, Xform, hatch_tile, mul};
+use crate::clip::{intersect, ops_bbox};
+use crate::dib::Rgba;
 use crate::geom::{Op, P};
+use crate::text::{ETO_CLIPPED, Font};
 
 /// "EMF+" as the comment identifier of an EMR_COMMENT holding EMF+ records.
 pub(crate) const EMF_PLUS: u32 = 0x2B46_4D45;
@@ -19,12 +31,158 @@ const MAX_OBJECTS: usize = 64;
 const MAX_STACK: usize = 64;
 /// Points per path or point list read, as the plain EMF reader caps paths.
 const MAX_POINTS: usize = 100_000;
+/// Gradient stops read from a brush.
+const MAX_STOPS: usize = 256;
+/// Characters per string.
+const MAX_CHARS: usize = 32_768;
+/// Bytes gathered for one object split across records.
+const MAX_OBJECT_BYTES: usize = 64 * 1024 * 1024;
+/// Nesting depth of region nodes.
+const MAX_REGION_DEPTH: usize = 32;
 
-#[derive(Clone, Debug)]
+const TA_RIGHT: u32 = 2;
+const TA_CENTER: u32 = 6;
+const TA_BOTTOM: u32 = 8;
+const TA_BASELINE: u32 = 24;
+
+/// What a brush paints. Coordinates are in brush space, which `xf` maps to world space.
+#[derive(Clone)]
+enum Fill {
+    Solid([u8; 4]),
+    Hatch { style: u32, fg: [u8; 4], bg: [u8; 4] },
+    Linear { rect: [f64; 4], stops: Vec<(f64, [u8; 4])>, wrap: u32, xf: Xform },
+    Radial { center: P, radius: P, stops: Vec<(f64, [u8; 4])>, xf: Xform },
+    Texture { img: Arc<Rgba>, wrap: u32, xf: Xform },
+}
+
+impl Fill {
+    /// One colour standing for the brush (pens and text draw solid).
+    fn color(&self) -> [u8; 4] {
+        match self {
+            Fill::Solid(c) | Fill::Hatch { fg: c, .. } => *c,
+            Fill::Linear { stops, .. } | Fill::Radial { stops, .. } => ramp(stops, 0.5),
+            Fill::Texture { img, .. } => img.px.get(..4).and_then(|c| c.try_into().ok()).unwrap_or([0, 0, 0, 255]),
+        }
+    }
+
+    /// The colour at a brush-space point.
+    fn sample(&self, p: P) -> [u8; 4] {
+        match self {
+            Fill::Solid(c) | Fill::Hatch { fg: c, .. } => *c,
+            Fill::Linear { rect, stops, wrap, .. } => {
+                let t = if rect[2] == 0.0 { 0.0 } else { (p.0 - rect[0]) / rect[2] };
+                ramp(stops, wrap_t(t, *wrap))
+            }
+            Fill::Radial { center, radius, stops, .. } => {
+                let (dx, dy) = ((p.0 - center.0) / radius.0.max(1e-9), (p.1 - center.1) / radius.1.max(1e-9));
+                ramp(stops, dx.hypot(dy).min(1.0))
+            }
+            Fill::Texture { img, wrap, .. } => {
+                let (w, h) = (img.w as f64, img.h as f64);
+                if w == 0.0 || h == 0.0 {
+                    return [0, 0, 0, 0];
+                }
+                if *wrap == 4 && !(0.0..w).contains(&p.0) || *wrap == 4 && !(0.0..h).contains(&p.1) {
+                    return [0, 0, 0, 0];
+                }
+                let x = (p.0.rem_euclid(w) as usize).min(img.w - 1);
+                let y = (p.1.rem_euclid(h) as usize).min(img.h - 1);
+                let i = (y * img.w + x) * 4;
+                img.px.get(i..i + 4).and_then(|c| c.try_into().ok()).unwrap_or([0, 0, 0, 0])
+            }
+        }
+    }
+
+    fn xf(&self) -> Xform {
+        match self {
+            Fill::Linear { xf, .. } | Fill::Radial { xf, .. } | Fill::Texture { xf, .. } => *xf,
+            _ => IDENTITY,
+        }
+    }
+}
+
+/// Where `t` lands under a wrap mode: tiled, mirrored (flip modes) or clamped.
+fn wrap_t(t: f64, wrap: u32) -> f64 {
+    if !t.is_finite() {
+        return 0.0;
+    }
+    match wrap {
+        1 | 3 => {
+            let m = t.rem_euclid(2.0);
+            if m > 1.0 { 2.0 - m } else { m }
+        }
+        4 => t.clamp(0.0, 1.0),
+        _ => t.rem_euclid(1.0),
+    }
+}
+
+/// The colour at `t` along sorted stops.
+fn ramp(stops: &[(f64, [u8; 4])], t: f64) -> [u8; 4] {
+    let (Some(first), Some(last)) = (stops.first(), stops.last()) else { return [0, 0, 0, 0] };
+    if t <= first.0 {
+        return first.1;
+    }
+    for w in stops.windows(2) {
+        let ((a, ca), (b, cb)) = (w[0], w[1]);
+        if t <= b {
+            let k = if b > a { (t - a) / (b - a) } else { 0.0 };
+            return lerp(ca, cb, k);
+        }
+    }
+    last.1
+}
+
+fn lerp(a: [u8; 4], b: [u8; 4], k: f64) -> [u8; 4] {
+    let mut c = [0u8; 4];
+    for i in 0..4 {
+        c[i] = (f64::from(a[i]) + (f64::from(b[i]) - f64::from(a[i])) * k).round().clamp(0.0, 255.0) as u8;
+    }
+    c
+}
+
+#[derive(Clone)]
+struct FontObj {
+    em: f64,
+    unit: u32,
+    style: u32,
+    family: String,
+}
+
+#[derive(Clone, Copy, Debug, Default)]
+struct Format {
+    flags: u32,
+    align: u32,
+    line_align: u32,
+}
+
+#[derive(Clone)]
 enum Obj {
-    Brush([u8; 4]),
-    Pen { color: [u8; 4], width: f64 },
+    Brush(Fill),
+    Pen {
+        color: [u8; 4],
+        width: f64,
+    },
     Path(Vec<Op>),
+    Image(Arc<Rgba>),
+    Font(FontObj),
+    Format(Format),
+    /// A region's bounding rectangle `[l, t, r, b]` in world units; None is infinite.
+    Region(Option<[f64; 4]>),
+}
+
+/// An object arriving in several records: its id, type, total size and the bytes so far.
+struct Partial {
+    id: usize,
+    kind: u16,
+    total: usize,
+    data: Vec<u8>,
+}
+
+struct Saved {
+    id: u32,
+    world: Xform,
+    page: f64,
+    clip: Option<[f64; 4]>,
 }
 
 pub(crate) struct Plus {
@@ -33,13 +191,16 @@ pub(crate) struct Plus {
     dpi: f64,
     world: Xform,
     page: f64,
+    /// Device clip rectangle `[l, t, r, b]`; None is unclipped.
+    clip: Option<[f64; 4]>,
     objects: Vec<Option<Obj>>,
-    stack: Vec<(u32, Xform, f64)>,
+    stack: Vec<Saved>,
+    partial: Option<Partial>,
 }
 
 impl Plus {
     pub fn new() -> Self {
-        Plus { active: false, dpi: 96.0, world: IDENTITY, page: 1.0, objects: vec![None; MAX_OBJECTS], stack: Vec::new() }
+        Plus { active: false, dpi: 96.0, world: IDENTITY, page: 1.0, clip: None, objects: vec![None; MAX_OBJECTS], stack: Vec::new(), partial: None }
     }
 
     /// Plays the EMF+ records of one EMR_COMMENT payload (after the identifier).
@@ -60,6 +221,15 @@ impl Plus {
         }
     }
 
+    /// World units to device pixels before the canvas's own mapping.
+    fn xf(&self) -> Xform {
+        mul(self.world, [self.page, 0.0, 0.0, self.page, 0.0, 0.0])
+    }
+
+    fn painter(&self) -> Painter {
+        Painter { xf: self.xf(), clip: self.clip }
+    }
+
     fn record(&mut self, cv: &mut Canvas, typ: u16, flags: u16, r: Bytes) -> Option<()> {
         if typ == 0x4001 {
             // Header: dual files also draw with EMF records, which win.
@@ -76,38 +246,83 @@ impl Plus {
         let id = usize::from(flags & 0xFF);
         match typ {
             0x4008 => self.object(flags, r),
-            0x400A => self.fill_rects(cv, flags, r),
-            0x400B => self.with_pen(id, |p| p.draw_rects(cv, compressed, r)),
-            0x400C => self.fill_polygon(cv, flags, r),
-            0x400D => self.with_pen(id, |p| {
-                let pts = points(r, 4, r.u32(0)? as usize, compressed)?;
-                p.shape(cv, poly_ops(&pts, flags & 0x2000 != 0), false, true);
+            0x400A => {
+                let fill = self.brush_of(flags, r.u32(0)?)?;
+                let p = self.painter();
+                for rc in rects(r, 8, r.u32(4)? as usize, compressed)? {
+                    p.fill(cv, &rect_ops(rc), &fill);
+                }
                 Some(())
-            }),
-            0x400E => self.fill_ellipse(cv, flags, r),
-            0x400F => self.with_pen(id, |p| {
-                let rect = rects(r, 0, 1, compressed)?;
-                p.shape(cv, ellipse_ops(*rect.first()?), false, true);
-                Some(())
-            }),
-            0x4014 => self.fill_path(cv, flags, r),
-            0x4015 => {
-                let path = self.path(id);
-                r.u32(0).and_then(|pen| {
-                    self.with_pen(pen as usize, |p| {
-                        p.shape(cv, path?, false, true);
-                        Some(())
-                    })
-                })
             }
-            0x4019 => self.with_pen(id, |p| {
+            0x400B => {
+                let pen = self.pen(id)?;
+                let p = self.painter();
+                for rc in rects(r, 4, r.u32(0)? as usize, compressed)? {
+                    p.stroke(cv, &rect_ops(rc), pen);
+                }
+                Some(())
+            }
+            0x400C => {
+                let fill = self.brush_of(flags, r.u32(0)?)?;
+                let pts = points(r, 8, r.u32(4)? as usize, compressed)?;
+                self.painter().fill(cv, &poly_ops(&pts, true), &fill);
+                Some(())
+            }
+            0x400D => {
+                let pen = self.pen(id)?;
+                let pts = points(r, 4, r.u32(0)? as usize, compressed)?;
+                self.painter().stroke(cv, &poly_ops(&pts, flags & 0x2000 != 0), pen);
+                Some(())
+            }
+            0x400E => {
+                let fill = self.brush_of(flags, r.u32(0)?)?;
+                let rect = *rects(r, 4, 1, compressed)?.first()?;
+                self.painter().fill(cv, &ellipse_ops(rect), &fill);
+                Some(())
+            }
+            0x400F => {
+                let pen = self.pen(id)?;
+                let rect = *rects(r, 0, 1, compressed)?.first()?;
+                self.painter().stroke(cv, &ellipse_ops(rect), pen);
+                Some(())
+            }
+            0x4014 => {
+                let fill = self.brush_of(flags, r.u32(0)?)?;
+                let ops = self.path(id)?;
+                self.painter().fill(cv, &ops, &fill);
+                Some(())
+            }
+            0x4015 => {
+                let ops = self.path(id)?;
+                let pen = self.pen(r.u32(0)? as usize)?;
+                self.painter().stroke(cv, &ops, pen);
+                Some(())
+            }
+            0x4019 => {
+                let pen = self.pen(id)?;
                 let pts = points(r, 4, r.u32(0)? as usize, compressed)?;
                 let (first, rest) = pts.split_first()?;
                 let mut ops = vec![Op::M(*first)];
                 ops.extend(rest.as_chunks::<3>().0.iter().map(|c| Op::C(c[0], c[1], c[2])));
-                p.shape(cv, ops, false, true);
+                self.painter().stroke(cv, &ops, pen);
                 Some(())
-            }),
+            }
+            0x401A => {
+                let img = self.image(id)?;
+                let dst = *rects(r, 24, 1, compressed)?.first()?;
+                self.draw_image(cv, &img, r, [dst[0], dst[1], dst[2] - dst[0], dst[3] - dst[1]])
+            }
+            0x401B => {
+                let img = self.image(id)?;
+                let pts = points(r, 28, 3, compressed)?;
+                let (p0, p1, p2) = (*pts.first()?, *pts.get(1)?, *pts.get(2)?);
+                // The destination parallelogram's top-left, top-right and bottom-left corners; a
+                // sheared or rotated one is drawn into its bounding rectangle's axes.
+                let dst = [p0.0, p0.1, p1.0 - p0.0 + (p2.0 - p0.0), p2.1 - p0.1 + (p1.1 - p0.1)];
+                self.draw_image(cv, &img, r, dst)
+            }
+            0x401C => self.draw_string(cv, flags, r),
+            0x4036 => self.draw_driver_string(cv, flags, r),
             0x4025 | 0x4028 => r.u32(0).map(|i| self.push(i)),
             0x4027 => r.u32(24).map(|i| self.push(i)),
             0x4026 | 0x4029 => r.u32(0).map(|i| self.pop(i)),
@@ -124,20 +339,40 @@ impl Plus {
                 self.apply([a.cos(), a.sin(), -a.sin(), a.cos(), 0.0, 0.0], flags)
             }
             0x4030 => {
-                let scale = f64::from(r.f32(0)?);
-                let unit = match flags & 0xFF {
-                    3 => self.dpi / 72.0,
-                    4 => self.dpi,
-                    5 => self.dpi / 300.0,
-                    6 => self.dpi / 25.4,
-                    _ => 1.0,
-                };
-                let page = scale * unit;
+                let page = f64::from(r.f32(0)?) * unit_px(u32::from(flags & 0xFF), self.dpi);
                 if page.is_finite() && page > 0.0 && page < 1.0e6 {
                     self.page = page;
                 }
                 Some(())
             }
+            0x4031 => {
+                self.clip = None;
+                Some(())
+            }
+            0x4032 => {
+                let [x, y, w, h] = floats::<4>(r, 0)?;
+                let dev = self.device_rect(cv, [x, y, x + w, y + h]);
+                self.combine(flags, Some(dev))
+            }
+            0x4033 => {
+                let b = ops_bbox(&self.path(id)?)?;
+                let dev = self.device_rect(cv, b);
+                self.combine(flags, Some(dev))
+            }
+            0x4034 => {
+                let Some(Some(Obj::Region(reg))) = self.objects.get(id).cloned() else { return None };
+                let dev = reg.map(|b| self.device_rect(cv, b));
+                self.combine(flags, dev)
+            }
+            0x4035 => {
+                let [dx, dy] = floats::<2>(r, 0)?;
+                let a = mul(self.xf(), cv.device_affine());
+                let (ox, oy) = (dx * a[0] + dy * a[2], dx * a[1] + dy * a[3]);
+                if let Some(c) = self.clip.as_mut() {
+                    *c = [c[0] + ox, c[1] + oy, c[2] + ox, c[3] + oy];
+                }
+                Some(())
+            }
             _ => None,
         }
     }
@@ -150,35 +385,94 @@ impl Plus {
 
     fn push(&mut self, id: u32) {
         if self.stack.len() < MAX_STACK {
-            self.stack.push((id, self.world, self.page));
+            self.stack.push(Saved { id, world: self.world, page: self.page, clip: self.clip });
         }
     }
 
     fn pop(&mut self, id: u32) {
-        if let Some(i) = self.stack.iter().rposition(|s| s.0 == id) {
-            let (_, w, p) = self.stack[i];
+        if let Some(i) = self.stack.iter().rposition(|s| s.id == id) {
+            let s = &self.stack[i];
+            (self.world, self.page, self.clip) = (s.world, s.page, s.clip);
             self.stack.truncate(i);
-            self.world = w;
-            self.page = p;
         }
     }
 
-    fn object(&mut self, flags: u16, r: Bytes) -> Option<()> {
-        if flags & 0x8000 != 0 {
-            // Continued (split) objects are images and large paths; not read yet.
+    /// A world rectangle `[l, t, r, b]` as the device rectangle around it.
+    fn device_rect(&self, cv: &Canvas, [l, t, r, b]: [f64; 4]) -> [f64; 4] {
+        let a = mul(self.xf(), cv.device_affine());
+        let pts = [(l, t), (r, t), (l, b), (r, b)].map(|p| apply(a, p));
+        let xs = pts.map(|p| p.0);
+        let ys = pts.map(|p| p.1);
+        let min = |v: [f64; 4]| v.iter().copied().fold(f64::INFINITY, f64::min);
+        let max = |v: [f64; 4]| v.iter().copied().fold(f64::NEG_INFINITY, f64::max);
+        [min(xs), min(ys), max(xs), max(ys)]
+    }
+
+    /// Combines a new clip area (None: infinite) with the current one under the record's combine
+    /// mode: replace, intersect and union (as the rectangle around both). XOR, exclude and
+    /// complement leave the clip as it was.
+    fn combine(&mut self, flags: u16, new: Option<[f64; 4]>) -> Option<()> {
+        if new.is_some_and(|c| !c.iter().all(|v| v.is_finite())) {
             return None;
         }
-        let id = usize::from(flags & 0xFF);
-        let obj = match (flags >> 8) & 0x7F {
-            1 => brush(r, 0).map(|(c, _)| Obj::Brush(c)),
-            2 => pen(r),
-            3 => path(r).map(Obj::Path),
-            _ => None,
+        self.clip = match (flags >> 8) & 0xF {
+            0 => new,
+            1 => match (self.clip, new) {
+                (None, n) => n,
+                (c, None) => c,
+                (Some(a), Some(b)) => Some(intersect(a, b)),
+            },
+            2 => match (self.clip, new) {
+                (Some(a), Some(b)) => Some([a[0].min(b[0]), a[1].min(b[1]), a[2].max(b[2]), a[3].max(b[3])]),
+                _ => None,
+            },
+            _ => self.clip,
         };
+        Some(())
+    }
+
+    fn object(&mut self, flags: u16, r: Bytes) -> Option<()> {
+        let id = usize::from(flags & 0xFF);
+        let kind = (flags >> 8) & 0x7F;
+        if flags & 0x8000 != 0 {
+            // A continued object: the total size, then this record's share of the bytes.
+            let total = (r.u32(0)? as usize).min(MAX_OBJECT_BYTES);
+            let chunk = r.tail(4)?.0;
+            let p = match self.partial.take() {
+                Some(p) if p.id == id && p.kind == kind && p.total == total => p,
+                _ => Partial { id, kind, total, data: Vec::new() },
+            };
+            let mut p = p;
+            let room = p.total.saturating_sub(p.data.len());
+            p.data.extend_from_slice(&chunk[..chunk.len().min(room)]);
+            if p.data.len() >= p.total {
+                let obj = parse_object(p.kind, Bytes(&p.data));
+                self.store(p.id, obj);
+            } else {
+                self.partial = Some(p);
+            }
+            return Some(());
+        }
+        // The last piece of a continued object comes without the continue flag.
+        if let Some(mut p) = self.partial.take()
+            && p.id == id
+            && p.kind == kind
+        {
+            let room = p.total.saturating_sub(p.data.len());
+            p.data.extend_from_slice(&r.0[..r.0.len().min(room)]);
+            let obj = parse_object(kind, Bytes(&p.data));
+            self.store(id, obj);
+            return Some(());
+        }
+        let obj = parse_object(kind, r);
+        self.store(id, obj);
+        Some(())
+    }
+
+    fn store(&mut self, id: usize, obj: Option<Obj>) {
         if let Some(slot) = self.objects.get_mut(id) {
             *slot = obj;
         }
-        Some(())
     }
 
     fn path(&self, id: usize) -> Option<Vec<Op>> {
@@ -188,88 +482,238 @@ impl Plus {
         }
     }
 
-    /// The brush colour of a fill record: an ARGB value with the `S` flag, else a brush object.
-    fn brush_of(&self, flags: u16, v: u32) -> Option<[u8; 4]> {
-        if flags & 0x8000 != 0 {
-            return Some(argb(v));
-        }
-        match self.objects.get(v as usize)? {
-            Some(Obj::Brush(c)) => Some(*c),
+    fn pen(&self, id: usize) -> Option<([u8; 4], f64)> {
+        match self.objects.get(id)? {
+            Some(Obj::Pen { color, width }) => Some((*color, *width)),
             _ => None,
         }
     }
 
-    fn with_pen<T>(&mut self, id: usize, f: impl FnOnce(&mut Painter) -> Option<T>) -> Option<T> {
-        let Some(Some(Obj::Pen { color, width })) = self.objects.get(id).cloned() else { return None };
-        let mut p = Painter { xf: mul(self.world, [self.page, 0.0, 0.0, self.page, 0.0, 0.0]), pen: Some((color, width)), fill: None };
-        f(&mut p)
+    fn image(&self, id: usize) -> Option<Arc<Rgba>> {
+        match self.objects.get(id)? {
+            Some(Obj::Image(img)) => Some(img.clone()),
+            _ => None,
+        }
     }
 
-    fn filler(&self, color: [u8; 4]) -> Painter {
-        Painter { xf: mul(self.world, [self.page, 0.0, 0.0, self.page, 0.0, 0.0]), pen: None, fill: Some(color) }
+    /// The brush of a fill record: an ARGB value with the `S` flag, else a brush object.
+    fn brush_of(&self, flags: u16, v: u32) -> Option<Fill> {
+        if flags & 0x8000 != 0 {
+            return Some(Fill::Solid(argb(v)));
+        }
+        match self.objects.get(v as usize)? {
+            Some(Obj::Brush(f)) => Some(f.clone()),
+            _ => None,
+        }
     }
 
-    fn fill_rects(&mut self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
-        let c = self.brush_of(flags, r.u32(0)?)?;
-        let rs = rects(r, 8, r.u32(4)? as usize, flags & 0x4000 != 0)?;
-        let p = self.filler(c);
-        for rc in rs {
-            p.shape(cv, rect_ops(rc), true, false);
+    /// DrawImage and DrawImagePoints: the source rectangle (pixels) cut from the image, drawn
+    /// into world rectangle `dst` = `[x, y, w, h]`.
+    fn draw_image(&self, cv: &mut Canvas, img: &Rgba, r: Bytes, dst: [f64; 4]) -> Option<()> {
+        let [sx, sy, sw, sh] = floats::<4>(r, 8)?;
+        let src = if r.u32(4)? == 2 { [sx, sy, sw, sh].map(|v| v.round().clamp(-1.0e9, 1.0e9) as i64) } else { [0; 4] };
+        let (part, dst) = crate::dib::clip_blit(img, src, dst)?;
+        self.painter().image(cv, dst, part);
+        Some(())
+    }
+
+    fn font(&self, id: usize) -> Option<FontObj> {
+        match self.objects.get(id)? {
+            Some(Obj::Font(f)) => Some(f.clone()),
+            _ => None,
+        }
+    }
+
+    /// The font as a LOGFONT whose height is in world units.
+    fn log_font(&self, f: &FontObj) -> LogFont {
+        let em = if f.unit == 0 { f.em } else { f.em * unit_px(f.unit, self.dpi) / self.page };
+        let font = Font {
+            family: f.family.clone(),
+            height: -(em.clamp(0.0, 1.0e6) as f32),
+            weight: if f.style & 1 != 0 { 700 } else { 400 },
+            italic: f.style & 2 != 0,
+            underline: f.style & 4 != 0,
+            strike: f.style & 8 != 0,
+            ..Font::default()
+        };
+        LogFont { font, escapement: 0.0 }
+    }
+
+    /// DrawString: lines of text laid out in a rectangle by the string format's alignments.
+    fn draw_string(&self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
+        let font = self.font(usize::from(flags & 0xFF))?;
+        let color = self.brush_of(flags, r.u32(0)?)?.color();
+        let fmt = match self.objects.get(r.u32(4)? as usize) {
+            Some(Some(Obj::Format(f))) => *f,
+            _ => Format::default(),
+        };
+        let len = (r.u32(8)? as usize).min(MAX_CHARS);
+        let [x, y, w, h] = floats::<4>(r, 12)?;
+        let units: Vec<u16> = (0..len).map(|i| r.u16(28 + i * 2)).collect::<Option<_>>()?;
+        let lf = self.log_font(&font);
+        let em = f64::from(-lf.font.height);
+        let lines: Vec<&[u16]> = units.split(|u| *u == 0x0A).collect();
+        let line_h = em * 1.2;
+        let (ax, ta_h) = match fmt.align {
+            1 => (x + w / 2.0, TA_CENTER),
+            2 => (x + w, TA_RIGHT),
+            _ => (x, 0),
+        };
+        let block = line_h * lines.len() as f64;
+        let top = match fmt.line_align {
+            1 => y + (h - block) / 2.0,
+            2 => y + h - block,
+            _ => y,
+        };
+        let clip = (w > 0.0 && h > 0.0 && fmt.flags & 0x4000 == 0).then_some([x, y, x + w, y + h]);
+        let p = self.painter();
+        for (i, line) in lines.iter().enumerate() {
+            let line: Vec<u16> = line.iter().copied().filter(|u| *u != 0x0D).collect();
+            if line.is_empty() {
+                continue;
+            }
+            let (text, dx) = crate::text::decode_utf16(&line, &[]);
+            let at = (ax, top + line_h * i as f64);
+            let (at, ta) = if fmt.line_align == 2 && lines.len() == 1 { ((ax, y + h), ta_h | TA_BOTTOM) } else { (at, ta_h) };
+            p.text(cv, at, text, dx, TextStyle { color, font: lf.clone(), align: ta, clip }, IDENTITY);
         }
         Some(())
     }
 
-    fn fill_polygon(&mut self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
-        let c = self.brush_of(flags, r.u32(0)?)?;
-        let pts = points(r, 8, r.u32(4)? as usize, flags & 0x4000 != 0)?;
-        self.filler(c).shape(cv, poly_ops(&pts, true), true, false);
-        Some(())
-    }
-
-    fn fill_ellipse(&mut self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
-        let c = self.brush_of(flags, r.u32(0)?)?;
-        let rect = *rects(r, 4, 1, flags & 0x4000 != 0)?.first()?;
-        self.filler(c).shape(cv, ellipse_ops(rect), true, false);
-        Some(())
-    }
-
-    fn fill_path(&mut self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
-        let c = self.brush_of(flags, r.u32(0)?)?;
-        let ops = self.path(usize::from(flags & 0xFF))?;
-        self.filler(c).shape(cv, ops, true, false);
+    /// DrawDriverString with character codes (CmapLookup): positioned glyphs on a baseline.
+    fn draw_driver_string(&self, cv: &mut Canvas, flags: u16, r: Bytes) -> Option<()> {
+        let font = self.font(usize::from(flags & 0xFF))?;
+        let color = self.brush_of(flags, r.u32(0)?)?.color();
+        let opts = r.u32(4)?;
+        if opts & 1 == 0 {
+            // Glyph indices into the font: the metafile crate knows no fonts to map them back.
+            return None;
+        }
+        let n = (r.u32(12)? as usize).min(MAX_CHARS);
+        let units: Vec<u16> = (0..n).map(|i| r.u16(16 + i * 2)).collect::<Option<_>>()?;
+        let pos = points(r, 16 + n * 2, n, false)?;
+        let m = if r.u32(8)? != 0 { matrix(r, 16 + n * 10)? } else { IDENTITY };
+        let lf = self.log_font(&font);
+        let first = *pos.first()?;
+        let dx: Vec<f32> = if opts & 4 != 0 {
+            Vec::new()
+        } else {
+            let mut d: Vec<f32> = pos.windows(2).map(|w| (w[1].0 - w[0].0) as f32).collect();
+            d.push(d.last().copied().unwrap_or(-lf.font.height * 0.5));
+            d
+        };
+        let (text, dx) = crate::text::decode_utf16(&units, &dx);
+        self.painter().text(cv, first, text, dx, TextStyle { color, font: lf, align: TA_BASELINE, clip: None }, m);
         Some(())
     }
 }
 
-/// Draws through the canvas with EMF+'s transform and its own pen or brush, then puts the
+/// Page unit to device pixels: world, display and pixel are 1; point, inch, document, mm.
+fn unit_px(unit: u32, dpi: f64) -> f64 {
+    match unit {
+        3 => dpi / 72.0,
+        4 => dpi,
+        5 => dpi / 300.0,
+        6 => dpi / 25.4,
+        _ => 1.0,
+    }
+}
+
+struct TextStyle {
+    color: [u8; 4],
+    font: LogFont,
+    align: u32,
+    /// World clip rectangle `[l, t, r, b]`.
+    clip: Option<[f64; 4]>,
+}
+
+/// Draws through the canvas with EMF+'s transform, clip and its own pen or brush, then puts the
 /// canvas's GDI state back.
 struct Painter {
     xf: Xform,
-    pen: Option<([u8; 4], f64)>,
-    fill: Option<[u8; 4]>,
+    clip: Option<[f64; 4]>,
 }
 
 impl Painter {
-    fn shape(&self, cv: &mut Canvas, ops: Vec<Op>, fill: bool, stroke: bool) {
+    fn begin(&self, cv: &mut Canvas, pre: Xform) {
         let world = cv.world();
         cv.save_dc();
-        cv.modify_world(mul(self.xf, world), 4);
-        let (pc, pw) = self.pen.unwrap_or(([0, 0, 0, 0], 0.0));
-        cv.set_pen(Pen { style: if self.pen.is_some() { 0 } else { PS_NULL }, width: pw, color: pc });
-        cv.set_brush(match self.fill {
-            Some(c) => Brush::new(BS_SOLID, c),
-            None => Brush::new(BS_NULL, [0, 0, 0, 0]),
-        });
-        cv.shape(&ops, fill, stroke);
-        cv.restore_dc(-1);
+        cv.modify_world(mul(mul(pre, self.xf), world), 4);
+        cv.set_clip(self.clip);
     }
 
-    fn draw_rects(&self, cv: &mut Canvas, compressed: bool, r: Bytes) -> Option<()> {
-        for rc in rects(r, 4, r.u32(0)? as usize, compressed)? {
-            self.shape(cv, rect_ops(rc), false, true);
-        }
-        Some(())
+    fn end(&self, cv: &mut Canvas) {
+        cv.restore_dc(-1);
+        cv.set_clip(None);
     }
+
+    fn no_pen(cv: &mut Canvas) {
+        cv.set_pen(Pen { style: PS_NULL, width: 0.0, color: [0, 0, 0, 0] });
+    }
+
+    fn fill(&self, cv: &mut Canvas, ops: &[Op], fill: &Fill) {
+        self.begin(cv, IDENTITY);
+        Self::no_pen(cv);
+        match fill {
+            Fill::Solid(c) => {
+                cv.set_brush(Brush::new(BS_SOLID, *c));
+                cv.shape(ops, true, false);
+            }
+            Fill::Hatch { style, fg, bg } => match hatch_tile(*style, *fg, Some(*bg)) {
+                Some(px) => cv.tile_shape(ops, Arc::new(RawTile { w: 8, h: 8, px, cell: cv.pattern_px })),
+                // GDI+ has many more hatch styles than GDI: those fill with the blend of both colours.
+                None => {
+                    cv.set_brush(Brush::new(BS_SOLID, lerp(*fg, *bg, 0.5)));
+                    cv.shape(ops, true, false);
+                }
+            },
+            _ => {
+                // Device point to brush space: invert brush space → world → device.
+                if let Some(inv) = invert(mul(fill.xf(), cv.device_affine())) {
+                    cv.shade_shape(ops, &|p| fill.sample(apply(inv, p)));
+                }
+            }
+        }
+        self.end(cv);
+    }
+
+    fn stroke(&self, cv: &mut Canvas, ops: &[Op], (color, width): ([u8; 4], f64)) {
+        self.begin(cv, IDENTITY);
+        cv.set_pen(Pen { style: 0, width, color });
+        cv.set_brush(Brush::new(BS_NULL, [0, 0, 0, 0]));
+        cv.shape(ops, false, true);
+        self.end(cv);
+    }
+
+    fn image(&self, cv: &mut Canvas, dst: [f64; 4], img: Rgba) {
+        self.begin(cv, IDENTITY);
+        cv.bitmap(dst, img);
+        self.end(cv);
+    }
+
+    fn text(&self, cv: &mut Canvas, at: P, text: String, dx: Vec<f32>, style: TextStyle, pre: Xform) {
+        self.begin(cv, pre);
+        cv.set_text_style(style.color, style.font, style.align);
+        let (opts, rect) = match style.clip {
+            Some(c) => (ETO_CLIPPED, Some(c)),
+            None => (0, None),
+        };
+        cv.text(at, text, dx, opts, rect);
+        self.end(cv);
+    }
+}
+
+fn apply(m: Xform, p: P) -> P {
+    (p.0 * m[0] + p.1 * m[2] + m[4], p.0 * m[1] + p.1 * m[3] + m[5])
+}
+
+fn invert(m: Xform) -> Option<Xform> {
+    let det = m[0] * m[3] - m[1] * m[2];
+    if !det.is_finite() || det.abs() < 1e-12 {
+        return None;
+    }
+    let (a, b, c, d) = (m[3] / det, -m[1] / det, -m[2] / det, m[0] / det);
+    Some([a, b, c, d, -(m[4] * a + m[5] * c), -(m[4] * b + m[5] * d)])
 }
 
 /// ARGB (0xAARRGGBB) to RGBA.
@@ -277,21 +721,102 @@ fn argb(v: u32) -> [u8; 4] {
     [(v >> 16) as u8, (v >> 8) as u8, v as u8, (v >> 24) as u8]
 }
 
-fn matrix(r: Bytes, off: usize) -> Option<Xform> {
-    let mut m = [0.0; 6];
-    for (i, v) in m.iter_mut().enumerate() {
-        *v = f64::from(r.f32(off + i * 4)?);
+fn floats<const N: usize>(r: Bytes, off: usize) -> Option<[f64; N]> {
+    let mut v = [0.0; N];
+    for (i, x) in v.iter_mut().enumerate() {
+        *x = f64::from(r.f32(off + i * 4)?);
     }
-    m.iter().all(|v| v.is_finite()).then_some(m)
+    v.iter().all(|x| x.is_finite()).then_some(v)
 }
 
-/// A brush object at `off`: its colour and byte length. Only solid brushes are read; other kinds
-/// (hatch, texture, gradients) are given their first colour so shapes still show.
-fn brush(r: Bytes, off: usize) -> Option<([u8; 4], usize)> {
-    let kind = r.u32(off + 4)?;
-    let c = argb(r.u32(off + 8)?);
-    let c = if kind == 1 { argb(r.u32(off + 12)?) } else { c };
-    Some((c, 12))
+fn matrix(r: Bytes, off: usize) -> Option<Xform> {
+    floats::<6>(r, off)
+}
+
+fn parse_object(kind: u16, r: Bytes) -> Option<Obj> {
+    match kind {
+        1 => brush(r, 0).map(Obj::Brush),
+        2 => pen(r),
+        3 => path(r).map(Obj::Path),
+        4 => region(r),
+        5 => image(r).map(|i| Obj::Image(Arc::new(i))),
+        6 => font(r),
+        7 => Some(Obj::Format(Format { flags: r.u32(4)?, align: r.u32(12)?, line_align: r.u32(16)? })),
+        _ => None,
+    }
+}
+
+/// A brush object at `off`: version, type, then the type's data.
+fn brush(r: Bytes, off: usize) -> Option<Fill> {
+    let d = r.tail(off + 8)?;
+    match r.u32(off + 4)? {
+        0 => Some(Fill::Solid(argb(d.u32(0)?))),
+        1 => Some(Fill::Hatch { style: d.u32(0)?, fg: argb(d.u32(4)?), bg: argb(d.u32(8)?) }),
+        2 => {
+            let bflags = d.u32(0)?;
+            let wrap = d.u32(4)?;
+            let (xf, off) = if bflags & 0x2 != 0 { (matrix(d, 8)?, 32) } else { (IDENTITY, 8) };
+            Some(Fill::Texture { img: Arc::new(image(d.tail(off)?)?), wrap, xf })
+        }
+        3 => path_gradient(d),
+        4 => linear_gradient(d),
+        _ => None,
+    }
+}
+
+fn linear_gradient(d: Bytes) -> Option<Fill> {
+    let bflags = d.u32(0)?;
+    let wrap = d.u32(4)?;
+    let rect = floats::<4>(d, 8)?;
+    let (c0, c1) = (argb(d.u32(24)?), argb(d.u32(28)?));
+    let mut off = 40;
+    let mut xf = IDENTITY;
+    if bflags & 0x2 != 0 {
+        xf = matrix(d, off)?;
+        off += 24;
+    }
+    let mut stops = vec![(0.0, c0), (1.0, c1)];
+    if bflags & 0x4 != 0 {
+        // Preset colours: positions, then one colour each.
+        let n = (d.u32(off)? as usize).min(MAX_STOPS);
+        let pos: Vec<f64> = (0..n).map(|i| d.f32(off + 4 + i * 4).map(f64::from)).collect::<Option<_>>()?;
+        let cols: Vec<[u8; 4]> = (0..n).map(|i| d.u32(off + 4 + n * 4 + i * 4).map(argb)).collect::<Option<_>>()?;
+        stops = pos.into_iter().zip(cols).collect();
+    } else if bflags & 0x8 != 0 {
+        // Blend factors: positions, then how far from the start colour to the end colour.
+        let n = (d.u32(off)? as usize).min(MAX_STOPS);
+        let pos: Vec<f64> = (0..n).map(|i| d.f32(off + 4 + i * 4).map(f64::from)).collect::<Option<_>>()?;
+        let fac: Vec<f64> = (0..n).map(|i| d.f32(off + 4 + n * 4 + i * 4).map(f64::from)).collect::<Option<_>>()?;
+        stops = pos.into_iter().zip(fac).map(|(p, k)| (p, lerp(c0, c1, k.clamp(0.0, 1.0)))).collect();
+    }
+    stops.retain(|s| s.0.is_finite());
+    stops.sort_by(|a, b| a.0.total_cmp(&b.0));
+    (!stops.is_empty()).then_some(Fill::Linear { rect, stops, wrap, xf })
+}
+
+/// A path gradient: from the centre colour to the (first) surrounding colour at the boundary,
+/// taken as the ellipse in the boundary's bounding rectangle.
+fn path_gradient(d: Bytes) -> Option<Fill> {
+    let bflags = d.u32(0)?;
+    let center_c = argb(d.u32(8)?);
+    let [cx, cy] = floats::<2>(d, 12)?;
+    let nc = (d.u32(20)? as usize).min(MAX_STOPS);
+    let surround = if nc > 0 { argb(d.u32(24)?) } else { center_c };
+    let mut off = 24 + nc * 4;
+    let bbox = if bflags & 0x1 != 0 {
+        let size = d.u32(off)? as usize;
+        let b = ops_bbox(&path(d.tail(off + 4)?)?)?;
+        off = off.checked_add(4 + size)?;
+        b
+    } else {
+        let n = d.u32(off)? as usize;
+        let pts = points(d, off + 4, n, false)?;
+        off = off.checked_add(4 + 8 * n.min(MAX_POINTS))?;
+        ops_bbox(&poly_ops(&pts, true))?
+    };
+    let xf = if bflags & 0x2 != 0 { matrix(d, off)? } else { IDENTITY };
+    let radius = ((bbox[2] - bbox[0]) / 2.0, (bbox[3] - bbox[1]) / 2.0);
+    Some(Fill::Radial { center: (cx, cy), radius, stops: vec![(0.0, center_c), (1.0, surround)], xf })
 }
 
 /// A pen object: version, type, then pen data (flags, unit, width, optional fields), then a brush.
@@ -314,7 +839,7 @@ fn pen(r: Bytes) -> Option<Obj> {
             off += 4 + (r.u32(off)? as usize).min(1 << 20);
         }
     }
-    let (color, _) = brush(r, off)?;
+    let color = brush(r, off)?.color();
     Some(Obj::Pen { color, width: if width.is_finite() { width.clamp(0.0, 1.0e5) } else { 0.0 } })
 }
 
@@ -338,12 +863,10 @@ fn path(r: Bytes) -> Option<Vec<Op>> {
             0 => ops.push(Op::M(p)),
             3 if i + 2 < n => {
                 ops.push(Op::C(p, pts[i + 1], pts[i + 2]));
-                let last = types[i + 2];
-                i += 2;
-                if last & 0x80 != 0 {
+                if types[i + 2] & 0x80 != 0 {
                     ops.push(Op::Z);
                 }
-                i += 1;
+                i += 3;
                 continue;
             }
             _ => ops.push(Op::L(p)),
@@ -356,6 +879,163 @@ fn path(r: Bytes) -> Option<Vec<Op>> {
     Some(ops)
 }
 
+/// A region object reduced to its bounding rectangle (None: infinite).
+fn region(r: Bytes) -> Option<Obj> {
+    region_node(r, 8, 0).map(|(b, _)| Obj::Region(b))
+}
+
+/// One region node at `off`: its bounds (None: infinite; an empty node is a zero rectangle) and
+/// its length in bytes.
+fn region_node(r: Bytes, off: usize, depth: usize) -> Option<(Option<[f64; 4]>, usize)> {
+    if depth > MAX_REGION_DEPTH {
+        return None;
+    }
+    match r.u32(off)? {
+        0x1000_0000 => {
+            let [x, y, w, h] = floats::<4>(r, off + 4)?;
+            Some((Some([x.min(x + w), y.min(y + h), x.max(x + w), y.max(y + h)]), 20))
+        }
+        0x1000_0001 => {
+            let size = r.u32(off + 4)? as usize;
+            let b = ops_bbox(&path(r.tail(off + 8)?)?).unwrap_or([0.0; 4]);
+            Some((Some(b), 8usize.checked_add(size)?))
+        }
+        0x1000_0002 => Some((Some([0.0; 4]), 4)),
+        0x1000_0003 => Some((None, 4)),
+        mode @ 1..=5 => {
+            let (a, la) = region_node(r, off + 4, depth + 1)?;
+            let (b, lb) = region_node(r, off.checked_add(4 + la)?, depth + 1)?;
+            let out = match mode {
+                1 => match (a, b) {
+                    (None, x) | (x, None) => x,
+                    (Some(a), Some(b)) => Some(intersect(a, b)),
+                },
+                2 => match (a, b) {
+                    (Some(a), Some(b)) => Some([a[0].min(b[0]), a[1].min(b[1]), a[2].max(b[2]), a[3].max(b[3])]),
+                    _ => None,
+                },
+                // XOR, exclude, complement: the left area bounds the result closely enough.
+                _ => a,
+            };
+            Some((out, (4 + la).checked_add(lb)?))
+        }
+        // Replace: the right-hand area.
+        0 => {
+            let (_, la) = region_node(r, off + 4, depth + 1)?;
+            let (b, lb) = region_node(r, off.checked_add(4 + la)?, depth + 1)?;
+            Some((b, (4 + la).checked_add(lb)?))
+        }
+        _ => None,
+    }
+}
+
+/// A font object: em size, unit, style flags, then the family name in UTF-16.
+fn font(r: Bytes) -> Option<Obj> {
+    let em = f64::from(r.f32(4)?);
+    let n = (r.u32(20)? as usize).min(64);
+    let units: Vec<u16> = (0..n).map(|i| r.u16(24 + i * 2)).collect::<Option<_>>()?;
+    let family = String::from_utf16_lossy(&units).trim_end_matches('\0').to_string();
+    em.is_finite().then_some(Obj::Font(FontObj { em, unit: r.u32(8)?, style: r.u32(12)?, family }))
+}
+
+/// An image object: a bitmap of raw pixels or a compressed (PNG, JPEG, GIF…) file. Metafile
+/// images are not drawn yet.
+fn image(r: Bytes) -> Option<Rgba> {
+    if r.u32(4)? != 1 {
+        return None;
+    }
+    let (w, h, stride) = (r.u32(8)? as i32, r.u32(12)? as i32, r.u32(16)? as i32);
+    let format = r.u32(20)?;
+    let data = r.tail(28)?;
+    if r.u32(24)? == 1 {
+        return decode_compressed(data.0);
+    }
+    let (w, h) = (usize::try_from(w).ok()?, usize::try_from(h).ok()?);
+    if w == 0 || h == 0 || w.checked_mul(h)? > crate::MAX_PIXELS {
+        return None;
+    }
+    let bpp = ((format >> 8) & 0xFF) as usize;
+    let (pal, pixels) = if format & 0x0001_0000 != 0 {
+        // Indexed formats carry a palette first: flags, count, ARGB entries.
+        let n = (data.u32(4)? as usize).min(256);
+        let pal: Vec<[u8; 4]> = (0..n).map(|i| data.u32(8 + i * 4).map(argb)).collect::<Option<_>>()?;
+        (pal, data.tail(8 + n * 4)?)
+    } else {
+        (Vec::new(), data)
+    };
+    let row = (w.checked_mul(bpp)?).div_ceil(8);
+    let stride_abs = (stride.unsigned_abs() as usize).max(row);
+    let mut px = Vec::with_capacity(w * h * 4);
+    for y in 0..h {
+        let line = pixels.slice(y.checked_mul(stride_abs)?, row)?;
+        for x in 0..w {
+            let c = match (format, bpp) {
+                (_, 1 | 4 | 8) if !pal.is_empty() => {
+                    let bit = x * bpp;
+                    let byte = *line.get(bit / 8)?;
+                    let i = (byte >> (8 - bpp - bit % 8)) & ((1u16 << bpp) - 1) as u8;
+                    pal.get(usize::from(i)).copied().unwrap_or([0, 0, 0, 255])
+                }
+                (_, 24) => {
+                    let p = line.get(x * 3..x * 3 + 3)?;
+                    [p[2], p[1], p[0], 255]
+                }
+                (0x0002_2009, 32) => {
+                    let p = line.get(x * 4..x * 4 + 4)?;
+                    [p[2], p[1], p[0], 255]
+                }
+                (0x000E_200B, 32) => {
+                    let p = line.get(x * 4..x * 4 + 4)?;
+                    let a = u32::from(p[3]);
+                    let un = |v: u8| (u32::from(v) * 255 + a / 2).checked_div(a).map_or(v, |c| c.min(255) as u8);
+                    [un(p[2]), un(p[1]), un(p[0]), p[3]]
+                }
+                (_, 32) => {
+                    let p = line.get(x * 4..x * 4 + 4)?;
+                    [p[2], p[1], p[0], p[3]]
+                }
+                (0x0002_1006, 16) => {
+                    let v = u16::from_le_bytes([*line.get(x * 2)?, *line.get(x * 2 + 1)?]);
+                    let s = |v: u16, bits: u32| ((u32::from(v) * 255) / ((1 << bits) - 1)) as u8;
+                    [s(v >> 11, 5), s((v >> 5) & 0x3F, 6), s(v & 0x1F, 5), 255]
+                }
+                (_, 16) => {
+                    let v = u16::from_le_bytes([*line.get(x * 2)?, *line.get(x * 2 + 1)?]);
+                    let s = |v: u16| ((u32::from(v & 0x1F) * 255) / 31) as u8;
+                    [s(v >> 10), s(v >> 5), s(v), 255]
+                }
+                _ => return None,
+            };
+            px.extend_from_slice(&c);
+        }
+    }
+    // A negative stride stores the rows bottom-up.
+    Some(top_down(Rgba { w, h, bottom_up: stride < 0, px }))
+}
+
+fn top_down(mut img: Rgba) -> Rgba {
+    if img.bottom_up {
+        crate::dib::flip(&mut img, false, true);
+        img.bottom_up = false;
+    }
+    img
+}
+
+fn decode_compressed(bytes: &[u8]) -> Option<Rgba> {
+    let mut reader = image::ImageReader::new(std::io::Cursor::new(bytes)).with_guessed_format().ok()?;
+    let mut limits = image::Limits::default();
+    limits.max_image_width = Some(1 << 15);
+    limits.max_image_height = Some(1 << 15);
+    limits.max_alloc = Some((crate::MAX_PIXELS * 4) as u64);
+    reader.limits(limits);
+    let img = reader.decode().ok()?.to_rgba8();
+    let (w, h) = (img.width() as usize, img.height() as usize);
+    if w.checked_mul(h)? > crate::MAX_PIXELS {
+        return None;
+    }
+    Some(Rgba { w, h, bottom_up: false, px: img.into_raw() })
+}
+
 /// `n` points at `off`: 16-bit integers when compressed, else 32-bit floats.
 fn points(r: Bytes, off: usize, n: usize, compressed: bool) -> Option<Vec<P>> {
     let n = n.min(MAX_POINTS);
diff --git a/crates/metafile/src/lib.rs b/crates/metafile/src/lib.rs
index cdf18154..ccdeba9d 100644
--- a/crates/metafile/src/lib.rs
+++ b/crates/metafile/src/lib.rs
@@ -15,6 +15,7 @@
 
 mod bytes;
 mod canvas;
+mod clip;
 mod dib;
 mod emf;
 mod emfplus;
diff --git a/crates/metafile/src/tests.rs b/crates/metafile/src/tests.rs
index e3c4c923..6a23ad6c 100644
--- a/crates/metafile/src/tests.rs
+++ b/crates/metafile/src/tests.rs
@@ -1624,3 +1624,163 @@ fn emfplus_garbage_records_never_panic() {
         let _ = parse(&emf(&[plus_comment(&recs)], [0; 4], [0; 4]));
     }
 }
+
+fn plus_pic(recs: Vec<Vec<u8>>) -> Picture {
+    let mut all = vec![plus_header(false)];
+    all.extend(recs);
+    parse(&emf(&[plus_comment(&all)], [0; 4], [0; 4])).unwrap()
+}
+
+fn u16s(s: &str) -> Vec<u8> {
+    s.encode_utf16().flat_map(|u| u.to_le_bytes()).collect()
+}
+
+/// A 2 x 2 32bpp ARGB bitmap image object: red, green / blue, white.
+fn bitmap_2x2() -> Vec<u8> {
+    let px = [0xFFFF_0000u32, 0xFF00_FF00, 0xFF00_00FF, 0xFFFF_FFFF];
+    cat(vec![h32(0xDBC0_1002), h32(1), h32(2), h32(2), h32(8), h32(0x0026_200A), h32(0), px.iter().flat_map(|v| v.to_le_bytes()).collect()])
+}
+
+fn draw_image(id: u16, dst: [f32; 4]) -> Vec<u8> {
+    prec(0x401A, id, &cat(vec![h32(0), h32(2), f32s(&[0.0, 0.0, 2.0, 2.0]), f32s(&dst)]))
+}
+
+#[test]
+fn emfplus_draw_image_places_the_bitmap() {
+    let p = plus_pic(vec![prec(0x4008, 0x0500 | 4, &bitmap_2x2()), draw_image(4, [10.0, 10.0, 20.0, 40.0])]);
+    match &p.items[0] {
+        Item::Bitmap { rect, width, height, rgba } => {
+            assert_eq!((*width, *height), (2, 2));
+            assert_eq!(rect, &[0.0, 0.0, 20.0, 40.0]);
+            assert_eq!(&rgba[..8], &[255, 0, 0, 255, 0, 255, 0, 255]);
+            assert_eq!(&rgba[8..12], &[0, 0, 255, 255]);
+        }
+        other => panic!("expected a bitmap: {other:?}"),
+    }
+}
+
+#[test]
+fn emfplus_object_split_across_records_is_joined() {
+    let obj = bitmap_2x2();
+    let (a, b) = obj.split_at(20);
+    let total = h32(obj.len() as u32);
+    let first = prec(0x4008, 0x8000 | 0x0500 | 1, &cat(vec![total.clone(), a.to_vec()]));
+    let second = prec(0x4008, 0x0500 | 1, b);
+    let p = plus_pic(vec![first, second, draw_image(1, [0.0, 0.0, 4.0, 4.0])]);
+    assert!(matches!(&p.items[0], Item::Bitmap { width: 2, height: 2, .. }));
+}
+
+#[test]
+fn emfplus_compressed_png_image_decodes() {
+    let mut png = Vec::new();
+    let img = image::RgbaImage::from_pixel(3, 1, image::Rgba([1, 2, 3, 255]));
+    image::DynamicImage::ImageRgba8(img).write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png).unwrap();
+    let obj = cat(vec![h32(0xDBC0_1002), h32(1), h32(0), h32(0), h32(0), h32(0), h32(1), png]);
+    let draw = prec(0x401A, 2, &cat(vec![h32(0), h32(2), f32s(&[0.0, 0.0, 3.0, 1.0]), f32s(&[0.0, 0.0, 3.0, 1.0])]));
+    let p = plus_pic(vec![prec(0x4008, 0x0500 | 2, &obj), draw]);
+    assert!(matches!(&p.items[0], Item::Bitmap { width: 3, height: 1, rgba, .. } if rgba[..4] == [1, 2, 3, 255]));
+}
+
+fn font_obj(family: &str, em: f32, unit: u32, style: u32) -> Vec<u8> {
+    cat(vec![h32(0xDBC0_1002), f32s(&[em]), h32(unit), h32(style), h32(0), h32(family.encode_utf16().count() as u32), u16s(family)])
+}
+
+#[test]
+fn emfplus_draw_string_with_font_and_centred_format() {
+    let font = prec(0x4008, 0x0600 | 3, &font_obj("Calibri", 12.0, 2, 1));
+    // String format: centre alignment, no clip.
+    let fmt = prec(0x4008, 0x0700 | 4, &cat(vec![h32(0xDBC0_1002), h32(0x4000), h32(0), h32(1), h32(0)]));
+    let s = prec(0x401C, 0x8000 | 3, &cat(vec![h32(0xFF11_2233), h32(4), h32(2), f32s(&[0.0, 0.0, 100.0, 20.0]), u16s("Hi")]));
+    let p = plus_pic(vec![font, fmt, prec(0x400A, 0x8000, &cat(vec![h32(0xFFFF_FFFF), h32(1), f32s(&[0.0, 0.0, 100.0, 20.0])])), s]);
+    let t = p.items.iter().find_map(|i| if let Item::Text(t) = i { Some(t) } else { None }).expect("a text item");
+    assert_eq!(t.text, "Hi");
+    assert_eq!(t.font.family, "Calibri");
+    assert_eq!(t.font.weight, 700);
+    assert!(close(t.font.height, -12.0));
+    assert_eq!(t.color, [0x11, 0x22, 0x33, 0xFF]);
+    assert_eq!(t.h_align, HAlign::Center);
+    assert!(close(t.transform[4] as f32, 50.0));
+    assert_eq!(t.background, None);
+    assert_eq!(t.clip, None);
+}
+
+#[test]
+fn emfplus_driver_string_uses_character_codes_and_positions() {
+    let font = prec(0x4008, 0x0600, &font_obj("Arial", 10.0, 0, 0));
+    let pos = f32s(&[5.0, 30.0, 11.0, 30.0]);
+    let s = prec(0x4036, 0x8000, &cat(vec![h32(0xFF00_0000), h32(1), h32(0), h32(2), u16s("Ab"), pos]));
+    let p = plus_pic(vec![prec(0x400A, 0x8000, &cat(vec![h32(0xFFFF_FFFF), h32(1), f32s(&[0.0, 0.0, 50.0, 50.0])])), font, s]);
+    let Some(Item::Text(t)) = p.items.get(1) else { panic!("expected text: {:?}", p.items) };
+    assert_eq!(t.text, "Ab");
+    assert_eq!(t.dx, vec![6.0, 6.0]);
+    assert_eq!(t.v_align, VAlign::Baseline);
+    assert!(close(t.transform[4] as f32, 5.0) && close(t.transform[5] as f32, 30.0));
+    // Glyph indices (no CmapLookup) are skipped.
+    let gi = prec(0x4036, 0x8000, &cat(vec![h32(0xFF00_0000), h32(0), h32(0), h32(1), h16(36), f32s(&[0.0, 0.0])]));
+    let font = prec(0x4008, 0x0600, &font_obj("Arial", 10.0, 0, 0));
+    assert!(plus_pic(vec![font, gi]).items.is_empty());
+}
+
+#[test]
+fn emfplus_linear_gradient_fills_with_a_shaded_tile() {
+    // Red to blue across x = 0..100.
+    let brush =
+        cat(vec![h32(0xDBC0_1002), h32(4), h32(0), h32(0), f32s(&[0.0, 0.0, 100.0, 10.0]), h32(0xFFFF_0000), h32(0xFF00_00FF), h32(0), h32(0)]);
+    let fill = prec(0x400A, 0, &cat(vec![h32(5), h32(1), f32s(&[0.0, 0.0, 100.0, 10.0])]));
+    let p = plus_pic(vec![prec(0x4008, 0x0100 | 5, &brush), fill]);
+    let Item::Pattern { tile, .. } = &p.items[0] else { panic!("expected a pattern: {:?}", p.items) };
+    let px = |x: usize| &tile.rgba[x * 4..x * 4 + 4];
+    assert!(px(0)[0] > 240 && px(0)[2] < 15, "left is red: {:?}", px(0));
+    let right = (tile.width as usize - 2).min(127);
+    assert!(px(right)[2] > 230 && px(right)[0] < 25, "right is blue: {:?}", px(right));
+}
+
+#[test]
+fn emfplus_hatch_brush_fills_with_an_8x8_tile() {
+    let brush = cat(vec![h32(0xDBC0_1002), h32(1), h32(4), h32(0xFF00_0000), h32(0xFFFF_FFFF)]);
+    let fill = prec(0x400A, 0, &cat(vec![h32(0), h32(1), f32s(&[0.0, 0.0, 16.0, 16.0])]));
+    let p = plus_pic(vec![prec(0x4008, 0x0100, &brush), fill]);
+    assert!(matches!(&p.items[0], Item::Pattern { tile, .. } if tile.width == 8 && tile.height == 8));
+}
+
+#[test]
+fn emfplus_clip_rect_cuts_fills_strokes_and_images() {
+    let clip = prec(0x4032, 0, &f32s(&[0.0, 0.0, 50.0, 50.0]));
+    let fill = prec(0x400A, 0x8000, &cat(vec![h32(0xFF00_0000), h32(1), f32s(&[25.0, 25.0, 50.0, 50.0])]));
+    let outside = prec(0x400A, 0x8000, &cat(vec![h32(0xFF00_0000), h32(1), f32s(&[60.0, 60.0, 5.0, 5.0])]));
+    let pen = prec(0x4008, 0x0200 | 1, &solid_pen(0xFF00_FF00, 1.0));
+    let line = prec(0x400D, 1, &cat(vec![h32(2), f32s(&[0.0, 10.0, 100.0, 10.0])]));
+    let img = prec(0x4008, 0x0500 | 2, &bitmap_2x2());
+    let p = plus_pic(vec![clip, fill, outside, pen, line, img, draw_image(2, [40.0, 0.0, 20.0, 20.0])]);
+    assert_eq!(p.items.len(), 3, "{:?}", p.items);
+    let (segs, ..) = path_segs(&p.items[0]);
+    let xs: Vec<f32> = segs.iter().filter_map(|s| if let Seg::Move(x, _) | Seg::Line(x, _) = s { Some(*x) } else { None }).collect();
+    // Picture coordinates start at the drawing's left edge (0): the square is cut at x = 50.
+    assert!(xs.iter().all(|x| *x <= 50.0 + 1e-3), "{segs:?}");
+    let (segs, ..) = path_segs(&p.items[1]);
+    assert!(matches!(segs[1], Seg::Line(x, _) if close(x, 50.0)), "{segs:?}");
+    let Item::Bitmap { rect, width, .. } = &p.items[2] else { panic!() };
+    assert_eq!(*width, 1);
+    assert!(close(rect[2], 10.0));
+}
+
+#[test]
+fn emfplus_reset_clip_and_restore_bring_drawing_back() {
+    let clip = prec(0x4032, 0, &f32s(&[0.0, 0.0, 1.0, 1.0]));
+    let fill = || prec(0x400A, 0x8000, &cat(vec![h32(0xFF00_0000), h32(1), f32s(&[10.0, 10.0, 5.0, 5.0])]));
+    let p = plus_pic(vec![prec(0x4025, 0, &h32(1)), clip, fill(), prec(0x4026, 0, &h32(1)), fill()]);
+    assert_eq!(p.items.len(), 1);
+    let clip = prec(0x4032, 0, &f32s(&[0.0, 0.0, 1.0, 1.0]));
+    let p = plus_pic(vec![clip, fill(), prec(0x4031, 0, &[]), fill()]);
+    assert_eq!(p.items.len(), 1);
+}
+
+#[test]
+fn emfplus_region_clip_intersects_rectangles() {
+    // Region: intersect(rect 0,0,30,30 ; rect 10,10,100,100) = 10..30.
+    let rect = |r: [f32; 4]| cat(vec![h32(0x1000_0000), f32s(&r)]);
+    let region = cat(vec![h32(0xDBC0_1002), h32(2), h32(1), rect([0.0, 0.0, 30.0, 30.0]), rect([10.0, 10.0, 90.0, 90.0])]);
+    let fill = prec(0x400A, 0x8000, &cat(vec![h32(0xFF00_0000), h32(1), f32s(&[0.0, 0.0, 100.0, 100.0])]));
+    let p = plus_pic(vec![prec(0x4008, 0x0400 | 6, &region), prec(0x4034, 6, &[]), fill]);
+    assert_eq!((p.width, p.height), (20.0, 20.0));
+}

From 11e63e31e18fb842b8f9cba88e1b5283dc4ce6f9 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:44:09 +0300
Subject: [PATCH 205/376] Lay out master header/footer text with the text
 engine in PDF pages

Notes pages and handouts lay out the master's header, date, footer and
page-number placeholders with deckcraft-text (render::place_master_texts),
so their text wraps in the placeholder and keeps mixed run formatting,
drawn as visible glyphs. Stacked on #580.
---
 crates/pdf/src/lib.rs       | 45 +++++++++++++++----------------------
 crates/pdf/src/tests.rs     | 34 ++++++++++++++++++++++++++++
 crates/render/src/lib.rs    |  2 +-
 crates/render/src/placed.rs | 24 ++++++++++++++++++++
 docs/gaps.md                |  8 ++++---
 5 files changed, 82 insertions(+), 31 deletions(-)

diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index c22dfb17..fca04d71 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -355,14 +355,14 @@ impl Exporter<'_> {
         if self.opts.text_layer {
             let view = Affine::translate((b.x0, b.y0)) * Affine::scale(k);
             for pt in deckcraft_render::place_slide(pres, i).texts {
-                self.text_layer(s, &pt, view);
+                self.text_layer(s, &pt, view, false);
             }
             let _ = sh;
         }
     }
 
     /// Invisible glyphs exactly over the rasterised text.
-    fn text_layer(&mut self, s: &mut Surface, pt: &PlacedText, view: Affine) {
+    fn text_layer(&mut self, s: &mut Surface, pt: &PlacedText, view: Affine, visible: bool) {
         for run in &pt.layout.runs {
             if run.glyphs.is_empty() || run.size <= 0.0 {
                 continue;
@@ -402,7 +402,16 @@ impl Exporter<'_> {
                 })
                 .collect();
             s.push_transform(&tf(view * pt.transform * Affine::translate((x0, y0))));
-            s.set_fill(Some(grey(0, 0.0)));
+            s.set_fill(Some(if visible {
+                let c = run.color;
+                Fill {
+                    paint: krilla::color::rgb::Color::new(c.r, c.g, c.b).into(),
+                    opacity: NormalizedF32::new((f64::from(c.a) / 255.0 * run.alpha) as f32).unwrap_or(NormalizedF32::ONE),
+                    ..Default::default()
+                }
+            } else {
+                grey(0, 0.0)
+            }));
             s.draw_glyphs(Point::from_xy(0.0, 0.0), &kg, font, &text, run.size as f32, false);
             s.set_fill(None);
             s.pop();
@@ -501,30 +510,12 @@ impl Exporter<'_> {
     /// page number when the deck has no such master.
     fn page_texts(&mut self, s: &mut Surface, master: Option<&deckcraft_model::Master>, pw: f64, ph: f64, n: usize) {
         let Some(m) = master else { return self.footer(s, pw, ph, n) };
-        for (r, text, right, st) in master_texts(self.pres, m, (pw, ph), n) {
-            let style = match (st.bold, st.italic) {
-                (true, true) => "Bold Italic",
-                (true, false) => "Bold",
-                (false, true) => "Italic",
-                _ => "Regular",
-            };
-            let family = if st.family.is_empty() { deckcraft_fonts::DEFAULT_FAMILY } else { st.family.as_str() };
-            let face = FontDb::global().face(family, style);
-            let Some(font) = self.font(&face) else { continue };
-            let size = st.size;
-            let k = size / face.upem.max(1.0);
-            let line = text.lines().next().unwrap_or("");
-            let w: f64 = line.chars().map(|c| face.advance(face.glyph_for(c)) * k).sum();
-            let x = if right { r.x1 - w } else { r.x0 };
-            let y = r.y0 + (r.height() + size * 0.7) / 2.0;
-            let c = st.color;
-            s.set_fill(Some(Fill {
-                paint: krilla::color::rgb::Color::new(c.r, c.g, c.b).into(),
-                opacity: NormalizedF32::new(f32::from(c.a) / 255.0).unwrap_or(NormalizedF32::ONE),
-                ..Default::default()
-            }));
-            s.draw_text(Point::from_xy(x as f32, y as f32), font, size as f32, line, false, TextDirection::Auto);
-            s.set_fill(None);
+        // Laid out by the text engine in the placeholders, scaled from the notes size to the page:
+        // wrapping, alignment and mixed formatting as the master has them.
+        let pres = self.pres;
+        let view = Affine::scale_non_uniform(pw / pres.notes_size.width.max(1.0), ph / pres.notes_size.height.max(1.0));
+        for pt in deckcraft_render::place_master_texts(pres, m, n) {
+            self.text_layer(s, &pt, view, true);
         }
     }
     fn footer(&mut self, s: &mut Surface, pw: f64, ph: f64, n: usize) {
diff --git a/crates/pdf/src/tests.rs b/crates/pdf/src/tests.rs
index 40a6afef..1af447ed 100644
--- a/crates/pdf/src/tests.rs
+++ b/crates/pdf/src/tests.rs
@@ -145,3 +145,37 @@ fn master_text_keeps_its_own_formatting() {
     p.notes_master = Some(Arc::new(m));
     assert!(export(&p, &PdfOptions { layout: PageLayout::Notes, ..Default::default() }).unwrap().starts_with(b"%PDF"));
 }
+
+#[test]
+fn master_text_wraps_and_keeps_mixed_formatting() {
+    use deckcraft_model::text::{Run, RunProps};
+    use deckcraft_model::{PhType, Rgba};
+    let mut p = deck(1);
+    p.notes_size = deckcraft_model::Size::new(612.0, 792.0);
+    let mut header = ph(PhType::Header, 0.0, 0.0, 200.0, 80.0, "");
+    if let Some(para) = header.text.as_mut().and_then(|t| t.paragraphs.first_mut()) {
+        para.runs = vec![
+            Run::with("Quarterly board pack ", RunProps { size: Some(18.0), bold: Some(true), ..Default::default() }),
+            Run::with(
+                "for internal circulation only, please do not forward",
+                RunProps {
+                    size: Some(9.0),
+                    fill: Some(deckcraft_model::Fill::solid(deckcraft_model::ColorRef::rgb(Rgba::rgb(200, 0, 0)))),
+                    ..Default::default()
+                },
+            ),
+        ];
+    }
+    let m = deckcraft_model::Master { shapes: vec![header, ph(PhType::SlideNum, 312.0, 760.0, 300.0, 30.0, "")], ..Default::default() };
+    let placed = deckcraft_render::place_master_texts(&p, &m, 4);
+    assert_eq!(placed.len(), 2, "header and page number");
+    let h = &placed[0].layout;
+    assert!(h.lines.len() >= 2, "wraps inside its 200 pt placeholder: {} lines", h.lines.len());
+    let sizes: Vec<f64> = h.runs.iter().filter(|r| !r.glyphs.is_empty()).map(|r| r.size).collect();
+    assert!(sizes.iter().any(|s| (*s - 18.0).abs() < 0.5) && sizes.iter().any(|s| (*s - 9.0).abs() < 0.5), "{sizes:?}");
+    assert!(h.runs.iter().any(|r| r.color == Rgba::rgb(200, 0, 0)));
+    let num: String = placed[1].body.text();
+    assert_eq!(num, "4");
+    p.notes_master = Some(Arc::new(m));
+    assert!(export(&p, &PdfOptions { layout: PageLayout::Notes, ..Default::default() }).unwrap().starts_with(b"%PDF"));
+}
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..74a3b8c9 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -49,7 +49,7 @@ pub use extent::{Region, TILE, layout_extent, pasteboard_region, slide_extent};
 pub use images::{decode as decode_image, gif_frame};
 pub use morph_path::PathMorph;
 pub use morph_text::TextMorph;
-pub use placed::{Placed, PlacedLink, PlacedText, place_slide};
+pub use placed::{Placed, PlacedLink, PlacedText, place_master_texts, place_slide};
 pub use table::row_heights as table_row_heights;
 pub use transition::{SlideParts, composite_transition, render_transition};
 
diff --git a/crates/render/src/placed.rs b/crates/render/src/placed.rs
index 0a0d4737..8acf72f2 100644
--- a/crates/render/src/placed.rs
+++ b/crates/render/src/placed.rs
@@ -55,6 +55,30 @@ pub fn place_slide(pres: &Presentation, index: usize) -> Placed {
     out
 }
 
+/// The header, date, footer and page-number text of a notes or handout `master`, laid out in its
+/// placeholders (master points) with their own formatting and wrapping, for page `n`. The page
+/// number placeholder shows `n` in its first run's formatting.
+pub fn place_master_texts(pres: &Presentation, master: &deckcraft_model::Master, n: usize) -> Vec<PlacedText> {
+    use deckcraft_model::PhType;
+    let mut out = Placed::default();
+    let ctx = Ctx::for_master(pres, master);
+    let fields = SlideFields::new(u32::try_from(n).unwrap_or(u32::MAX), pres.header_footer.footer_text.clone(), &crate::RenderOpts::default());
+    for s in master.shapes.iter().filter(|s| matches!(s.ph_type(), Some(PhType::Header | PhType::Date | PhType::Footer | PhType::SlideNum))) {
+        let mut s = s.clone();
+        if s.ph_type() == Some(PhType::SlideNum) {
+            let mut body = s.text.clone().unwrap_or_default();
+            let props =
+                body.paragraphs.first().and_then(|p| p.runs.first().map(|r| r.props.clone()).or(Some(p.end_props.clone()))).unwrap_or_default();
+            let mut para = body.paragraphs.first().cloned().unwrap_or_default();
+            para.runs = vec![deckcraft_model::text::Run::with(n.to_string(), props)];
+            body.paragraphs = vec![para];
+            s.text = Some(body);
+        }
+        place(&mut out, &ctx, &fields, &s, Affine::IDENTITY, 0);
+    }
+    out.texts
+}
+
 fn place(out: &mut Placed, rctx: &Ctx, fields: &SlideFields, s: &Shape, parent: Affine, depth: usize) {
     if depth > 32 || s.hidden {
         return;
diff --git a/docs/gaps.md b/docs/gaps.md
index 0ed1400e..e3a1091b 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -165,9 +165,10 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
   background, a slides-per-page preview for handouts) and PPTX keeps them. Notes pages (view and
   PDF) place the slide and notes where the notes master does and print its header, date, footer
   and page number in their own fonts, sizes and colours; PDF handouts print the handout master's.
-  Notes Master view previews the slide in its slide-image placeholder. Left: master text is one
-  line per placeholder (no wrapping, no mixed formatting within it).
-- **Estimate:** 1 h.
+  Notes Master view previews the slide in its slide-image placeholder. PDF pages lay master text
+  out with the text engine (wrapping, mixed formatting). Left: the on-screen Notes Page view still
+  draws it as one line per placeholder.
+- **Estimate:** 0.5 h.
 
 ### Edit points, text warp, 3-D
 - **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
@@ -261,6 +262,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | PDF master header/footer text wraps and keeps mixed formatting |
 | 2026-10-14 | trivial | Notes Master slide preview; master header/footer text keeps its formatting |
 | 2026-10-14 | minor | Notes pages and PDF handouts follow the notes and handout masters |
 | 2026-10-14 | minor | Notes Master view: the masters gap is now notes pages and PDF handouts following the masters |

From afd058a8fff663c402ccc5781c99d81215cdfb2b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:50:34 +0300
Subject: [PATCH 206/376] UI: sections in the Slide Sorter

The sorter draws a bar for each section. Add Section splits at the current
slide, double-click renames in place, the chevron collapses that section, and
dragging the bar moves the section and its slides together.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                         |   2 +
 crates/ui-egui/src/lib.rs          |   3 +
 crates/ui-egui/src/sorter.rs       | 366 ++++++++++++++++++++++++-----
 crates/ui-egui/src/sorter_tests.rs | 171 ++++++++++++++
 docs/ui-parity.md                  |   6 +-
 5 files changed, 487 insertions(+), 61 deletions(-)
 create mode 100644 crates/ui-egui/src/sorter_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..b2996a57 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Slide Sorter sections: Add Section, rename in place, collapse a section, and drag the bar to move that section and its slides |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Slide Sorter sections |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..f9af7c55 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -227,6 +227,8 @@ pub struct SlideApp {
     pub(crate) thumb_drag: Option<(usize, usize)>,
     /// Selection pane: folded groups, renaming, drag and drop.
     pub selpane: selpane::State,
+    /// Slide Sorter: folded sections, inline rename, dragging a whole section.
+    pub sorter: sorter::State,
 }
 
 impl SlideApp {
@@ -267,6 +269,7 @@ impl SlideApp {
             ui_fonts: uifonts::UiFonts::default(),
             thumb_drag: None,
             selpane: selpane::State::default(),
+            sorter: sorter::State::default(),
         }
     }
 
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index dd26dd85..95bc07d7 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -1,86 +1,332 @@
 //! Slide Sorter, Notes Page and the Outline pane.
 
-use egui::{Align2, Color32, CornerRadius, Rect, Sense, Stroke, Ui, pos2, vec2};
+use std::collections::HashSet;
+
+use deckcraft_model::{Presentation, SlideId};
+use egui::{Align2, Color32, CornerRadius, Rect, Sense, Stroke, Ui, WidgetInfo, WidgetType, pos2, vec2};
 use serde_json::json;
 
 use crate::SlideApp;
+use crate::icons::{self, Icon};
 use crate::theme::{self, Tokens};
 
+/// Sorter-only state. Nothing here is part of the document.
+#[derive(Debug, Default)]
+pub struct State {
+    /// Sections folded shut, keyed by (document uid, that section's first slide) so moving a
+    /// section does not fold a different one. An empty section has nothing to hide.
+    pub collapsed: HashSet<(u64, u32)>,
+    /// Inline rename: (document uid, section index, text typed so far).
+    pub renaming: Option<(u64, usize, String)>,
+    rename_started: bool,
+    /// Whole-section drag: (section index, insertion slot among the bars).
+    pub drag: Option<(usize, usize)>,
+}
+
+/// Where a dragged section would land. `centers` are the header centre-y values, top to bottom;
+/// `slot` is the gap (0 = before the first bar, `len` = after the last).
+fn drop_slot(centers: &[f32], y: f32) -> usize {
+    centers.iter().position(|cy| y < *cy).unwrap_or(centers.len())
+}
+
+/// `section.move`'s `to` for a drag from `from` released at `slot`. `None` when the section
+/// would stay where it is (the gap before it, or the gap just after it).
+fn move_dest(from: usize, slot: usize) -> Option<usize> {
+    if slot == from || slot == from + 1 { None } else { Some(if slot > from { slot - 1 } else { slot }) }
+}
+
+/// One section's slides, in the section's order, then any slide that belongs to none.
+fn groups(doc: &Presentation) -> Vec<(Option<usize>, Vec<usize>)> {
+    if doc.sections.is_empty() {
+        return vec![(None, (0..doc.slides.len()).collect())];
+    }
+    let mut seen = vec![false; doc.slides.len()];
+    let mut out = Vec::with_capacity(doc.sections.len() + 1);
+    for (si, sec) in doc.sections.iter().enumerate() {
+        let mut slides = Vec::with_capacity(sec.slides.len());
+        for id in &sec.slides {
+            if let Some(i) = doc.slide_index(*id)
+                && let Some(flag) = seen.get_mut(i)
+                && !*flag
+            {
+                *flag = true;
+                slides.push(i);
+            }
+        }
+        out.push((Some(si), slides));
+    }
+    let rest: Vec<usize> = seen.iter().enumerate().filter(|(_, on)| !**on).map(|(i, _)| i).collect();
+    if !rest.is_empty() {
+        out.push((None, rest));
+    }
+    out
+}
+
+struct Header<'a> {
+    uid: u64,
+    index: usize,
+    name: &'a str,
+    count: usize,
+    first: Option<u32>,
+}
+
+fn section_header(app: &mut SlideApp, ui: &mut Ui, h: &Header<'_>) -> Rect {
+    let t = Tokens::get(ui.ctx());
+    let width = ui.available_width();
+    let (r, _) = ui.allocate_exact_size(vec2(width, 32.0), Sense::hover());
+    let resp = ui.interact(r, ui.id().with(("sorter-section", h.uid, h.index)), Sense::click_and_drag());
+    resp.widget_info(|| WidgetInfo::labeled(WidgetType::Button, true, h.name));
+    let open = h.first.is_none_or(|id| !app.sorter.collapsed.contains(&(h.uid, id)));
+    let dragging = app.sorter.drag.is_some_and(|(from, _)| from == h.index);
+    let bg = if dragging {
+        t.selected
+    } else if resp.hovered() {
+        t.hover
+    } else {
+        t.card
+    };
+    let painter = ui.painter_at(r);
+    painter.rect_filled(r, CornerRadius::same(4), bg);
+    let chev = Rect::from_center_size(pos2(r.min.x + 20.0, r.center().y), vec2(24.0, 24.0));
+    let cresp = ui.interact(chev, ui.id().with(("sorter-fold", h.uid, h.index)), Sense::click());
+    let fold = format!("{} {}", if open { "Collapse" } else { "Expand" }, h.name);
+    cresp.widget_info(|| WidgetInfo::labeled(WidgetType::Button, true, &fold));
+    icons::paint(&painter, chev.shrink(4.0), if open { Icon::ChevronDown } else { Icon::ChevronRight }, t.text_dim, h.first.is_none());
+    let renaming = app.sorter.renaming.clone().filter(|(uid, index, _)| *uid == h.uid && *index == h.index).map(|(_, _, text)| text);
+    let name_rect = Rect::from_min_max(pos2(r.min.x + 40.0, r.min.y + 4.0), pos2(r.max.x - 56.0, r.max.y - 4.0));
+    if let Some(mut buf) = renaming {
+        let edit_id = ui.id().with(("sorter-rename", h.uid, h.index));
+        let out = ui.put(name_rect, egui::TextEdit::singleline(&mut buf).id(edit_id).font(theme::bold(13.0)).margin(vec2(4.0, 2.0)));
+        let already = app.sorter.rename_started;
+        if !already {
+            out.request_focus();
+            if let Some(mut state) = egui::TextEdit::load_state(ui.ctx(), edit_id) {
+                let all = egui::text::CCursorRange::two(egui::text::CCursor::new(0), egui::text::CCursor::new(buf.chars().count()));
+                state.cursor.set_char_range(Some(all));
+                state.store(ui.ctx(), edit_id);
+            }
+            app.sorter.rename_started = true;
+        }
+        let (enter, esc) = ui.input(|i| (i.key_pressed(egui::Key::Enter), i.key_pressed(egui::Key::Escape)));
+        // The frame that asks for focus has not had it yet; committing then would cancel the rename.
+        if already && (out.lost_focus() || enter || esc) {
+            app.sorter.renaming = None;
+            app.sorter.rename_started = false;
+            let trimmed = buf.trim();
+            if !esc && !trimmed.is_empty() && trimmed != h.name {
+                let _ = app.run("section.rename", json!({"index": h.index, "name": trimmed}));
+            }
+        } else if let Some((_, _, text)) = app.sorter.renaming.as_mut() {
+            *text = buf;
+        }
+    } else {
+        painter.text(pos2(name_rect.min.x, r.center().y), Align2::LEFT_CENTER, h.name, theme::bold(13.0), t.text);
+    }
+    painter.text(pos2(r.max.x - 16.0, r.center().y), Align2::RIGHT_CENTER, format!("({})", h.count), theme::font(12.0), t.text_dim);
+    if cresp.clicked()
+        && let Some(id) = h.first
+    {
+        let key = (h.uid, id);
+        if open {
+            app.sorter.collapsed.insert(key);
+        } else {
+            app.sorter.collapsed.remove(&key);
+        }
+    } else if resp.double_clicked() && app.sorter.renaming.is_none() {
+        app.sorter.renaming = Some((h.uid, h.index, h.name.to_string()));
+        app.sorter.rename_started = false;
+    }
+    let on_chevron = resp.interact_pointer_pos().is_some_and(|p| chev.contains(p));
+    if resp.drag_started() && !on_chevron && app.sorter.renaming.is_none() {
+        app.sorter.drag = Some((h.index, h.index));
+        app.thumb_drag = None;
+    }
+    let index = h.index;
+    let name = h.name.to_string();
+    resp.context_menu(|ui| {
+        if ui.button("Rename Section…").clicked() {
+            let mut d = crate::dialogs::Dialog::new("renameSection");
+            d.params = json!({"index": index, "name": name});
+            app.dialog = Some(d);
+            ui.close();
+        }
+        if ui.button("Add Section").clicked() {
+            if let Some(at) = app.session.active().map(|st| st.selection.slide) {
+                let _ = app.run("section.add", json!({"at": at}));
+            }
+            ui.close();
+        }
+        if ui.button("Remove Section").clicked() {
+            let _ = app.run("section.remove", json!({"index": index}));
+            ui.close();
+        }
+        if ui.button("Remove Section & Slides").clicked() {
+            let _ = app.run("section.remove", json!({"index": index, "slides": true}));
+            ui.close();
+        }
+        if ui.button("Move Section Up").clicked() {
+            let _ = app.run("section.move", json!({"index": index, "to": index.saturating_sub(1)}));
+            ui.close();
+        }
+        if ui.button("Move Section Down").clicked() {
+            let _ = app.run("section.move", json!({"index": index, "to": index + 1}));
+            ui.close();
+        }
+    });
+    r
+}
+
+struct Grid<'a> {
+    doc: &'a Presentation,
+    indices: &'a [usize],
+    cur: usize,
+    multi: &'a [SlideId],
+    tw: f32,
+    th: f32,
+}
+
+/// One section's thumbnails. Returns whether a thumbnail is still being drawn.
+fn place_slides(app: &mut SlideApp, ui: &mut Ui, g: &Grid<'_>, budget: &mut u32, rects: &mut Vec<(usize, Rect)>) -> bool {
+    let t = Tokens::get(ui.ctx());
+    let ppp = ui.ctx().pixels_per_point();
+    let cols = ((ui.available_width() - 32.0) / (g.tw + 36.0)).floor().max(1.0) as usize;
+    let mut need_more = false;
+    let rows = g.indices.len().div_ceil(cols);
+    for row in 0..rows {
+        ui.horizontal(|ui| {
+            ui.add_space(24.0);
+            for c in 0..cols {
+                let Some(&i) = g.indices.get(row * cols + c) else { break };
+                let (cell, resp) = ui.allocate_exact_size(vec2(g.tw + 36.0, g.th + 36.0), Sense::click_and_drag());
+                let label = format!("Slide {}", i + 1);
+                resp.widget_info(|| WidgetInfo::labeled(WidgetType::Button, true, &label));
+                let img = Rect::from_min_size(cell.min + vec2(18.0, 8.0), vec2(g.tw, g.th));
+                rects.push((i, cell));
+                let p = ui.painter();
+                match app.textures.thumb(ui.ctx(), g.doc, i, (g.tw * ppp) as u32, budget) {
+                    Some(tex) => {
+                        p.image(tex.id(), img, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
+                    }
+                    None => {
+                        p.rect_filled(img, CornerRadius::ZERO, Color32::WHITE);
+                        need_more = true;
+                    }
+                }
+                let id = g.doc.slides.get(i).map(|s| s.id);
+                let selected = i == g.cur || id.is_some_and(|id| g.multi.contains(&id));
+                p.rect_stroke(
+                    img.expand(if selected { 2.0 } else { 0.0 }),
+                    CornerRadius::same(3),
+                    Stroke::new(if selected { 3.0 } else { 1.0 }, if selected { t.accent } else { t.border }),
+                    egui::StrokeKind::Outside,
+                );
+                p.text(pos2(img.min.x, img.max.y + 12.0), Align2::LEFT_CENTER, format!("{}", i + 1), theme::font(12.0), t.text_dim);
+                if let Some(tr) = g.doc.slides.get(i).and_then(|s| s.transition.as_ref()).filter(|tr| tr.kind != "none") {
+                    p.text(pos2(img.max.x, img.max.y + 12.0), Align2::RIGHT_CENTER, format!("★ {}", tr.kind), theme::font(10.5), t.text_faint);
+                }
+                if resp.clicked() {
+                    let add = ui.input(|inp| inp.modifiers.command);
+                    if add {
+                        if let Some(id) = id {
+                            let _ = app.run("slide.selectSlides", json!({"ids": [id.0], "add": true}));
+                        }
+                    } else {
+                        let _ = app.run("slide.go", json!({"index": i}));
+                    }
+                }
+                if resp.double_clicked() {
+                    let _ = app.run("slide.go", json!({"index": i}));
+                    app.ui.view = crate::ViewMode::Normal;
+                }
+                if resp.drag_started() && app.sorter.drag.is_none() {
+                    app.thumb_drag = Some((i, i));
+                }
+                resp.context_menu(|ui| crate::thumbs::slide_menu(app, ui, i));
+            }
+        });
+    }
+    need_more
+}
+
 /// Grid of slides; click selects, double-click opens in Normal view, drag reorders.
+/// With sections, each one is a bar: add, rename, collapse, and drag the whole section.
 pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
-    let Some(st) = app.session.active() else { return };
+    let Some(st) = app.session.active() else {
+        app.sorter.drag = None;
+        app.sorter.renaming = None;
+        app.sorter.rename_started = false;
+        return;
+    };
+    let uid = st.uid;
+    if app.sorter.renaming.as_ref().is_some_and(|(u, i, _)| *u != uid || *i >= st.doc.sections.len()) {
+        app.sorter.renaming = None;
+        app.sorter.rename_started = false;
+    }
     let doc = st.doc.clone();
     let cur = st.selection.slide;
     let multi = st.selection.slides.clone();
     let zoom = app.ui.sorter_zoom.clamp(0.5, 3.0);
+    let grouped = groups(&doc);
     egui::ScrollArea::vertical().auto_shrink([false, false]).show(ui, |ui| {
-        ui.add_space(16.0);
+        ui.add_space(12.0);
+        ui.horizontal(|ui| {
+            ui.add_space(24.0);
+            if ui.add(egui::Button::new("Add Section").stroke(Stroke::new(1.0, t.border))).clicked() {
+                let _ = app.run("section.add", json!({"at": cur}));
+            }
+        });
+        ui.add_space(8.0);
         let tw = 200.0 * zoom;
         let th = tw * (doc.slide_size.height / doc.slide_size.width.max(1.0)) as f32;
-        let ppp = ui.ctx().pixels_per_point();
-        let cols = ((ui.available_width() - 32.0) / (tw + 36.0)).floor().max(1.0) as usize;
         let mut budget = 4u32;
         let mut rects = vec![];
+        let mut headers: Vec<Rect> = Vec::new();
         let mut need_more = false;
-        for row in 0..doc.slides.len().div_ceil(cols) {
-            ui.horizontal(|ui| {
-                ui.add_space(24.0);
-                for c in 0..cols {
-                    let i = row * cols + c;
-                    if i >= doc.slides.len() {
-                        break;
-                    }
-                    let (cell, resp) = ui.allocate_exact_size(vec2(tw + 36.0, th + 36.0), Sense::click_and_drag());
-                    let img = Rect::from_min_size(cell.min + vec2(18.0, 8.0), vec2(tw, th));
-                    rects.push((i, cell));
-                    let p = ui.painter();
-                    match app.textures.thumb(ui.ctx(), &doc, i, (tw * ppp) as u32, &mut budget) {
-                        Some(tex) => {
-                            p.image(tex.id(), img, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
-                        }
-                        None => {
-                            p.rect_filled(img, CornerRadius::ZERO, Color32::WHITE);
-                            need_more = true;
-                        }
-                    }
-                    let id = doc.slides.get(i).map(|s| s.id);
-                    let selected = i == cur || id.is_some_and(|id| multi.contains(&id));
-                    p.rect_stroke(
-                        img.expand(if selected { 2.0 } else { 0.0 }),
-                        CornerRadius::same(3),
-                        Stroke::new(if selected { 3.0 } else { 1.0 }, if selected { t.accent } else { t.border }),
-                        egui::StrokeKind::Outside,
-                    );
-                    p.text(pos2(img.min.x, img.max.y + 12.0), Align2::LEFT_CENTER, format!("{}", i + 1), theme::font(12.0), t.text_dim);
-                    if let Some(tr) = doc.slides.get(i).and_then(|s| s.transition.as_ref()).filter(|t| t.kind != "none") {
-                        p.text(pos2(img.max.x, img.max.y + 12.0), Align2::RIGHT_CENTER, format!("★ {}", tr.kind), theme::font(10.5), t.text_faint);
-                    }
-                    if resp.clicked() {
-                        let add = ui.input(|i| i.modifiers.command);
-                        if add {
-                            if let Some(id) = id {
-                                let _ = app.run("slide.selectSlides", json!({"ids": [id.0], "add": true}));
-                            }
-                        } else {
-                            let _ = app.run("slide.go", json!({"index": i}));
-                        }
-                    }
-                    if resp.double_clicked() {
-                        let _ = app.run("slide.go", json!({"index": i}));
-                        app.ui.view = crate::ViewMode::Normal;
-                    }
-                    if resp.drag_started() {
-                        app.thumb_drag = Some((i, i));
-                    }
-                    resp.context_menu(|ui| crate::thumbs::slide_menu(app, ui, i));
+        for (si, slides) in &grouped {
+            if let Some(si) = *si
+                && let Some(sec) = doc.sections.get(si)
+            {
+                let first = sec.slides.first().map(|id| id.0);
+                let rect = section_header(app, ui, &Header { uid, index: si, name: &sec.name, count: sec.slides.len(), first });
+                headers.push(rect);
+                let folded = first.is_some_and(|id| app.sorter.collapsed.contains(&(uid, id)));
+                if folded {
+                    ui.add_space(8.0);
+                    continue;
                 }
-            });
+            }
+            let grid = Grid { doc: &doc, indices: slides, cur, multi: &multi, tw, th };
+            if place_slides(app, ui, &grid, &mut budget, &mut rects) {
+                need_more = true;
+            }
+            ui.add_space(8.0);
         }
         if need_more {
             ui.ctx().request_repaint();
         }
-        if let Some((from, _)) = app.thumb_drag {
+        if let Some((from, _)) = app.sorter.drag {
+            if let Some(pp) = ui.input(|i| i.pointer.interact_pos()) {
+                let centers: Vec<f32> = headers.iter().map(|r| r.center().y).collect();
+                let slot = drop_slot(&centers, pp.y);
+                app.sorter.drag = Some((from, slot));
+                let y = headers.get(slot).map(|r| r.min.y).or_else(|| headers.last().map(|r| r.max.y + 2.0));
+                if let Some(y) = y {
+                    ui.painter().line_segment([pos2(16.0, y), pos2(ui.available_width(), y)], Stroke::new(2.0, t.accent));
+                }
+            }
+            if ui.input(|i| i.pointer.any_released()) {
+                if let Some((from, slot)) = app.sorter.drag.take()
+                    && let Some(to) = move_dest(from, slot)
+                {
+                    let _ = app.run("section.move", json!({"index": from, "to": to}));
+                }
+                app.sorter.drag = None;
+            }
+        }
+        if app.sorter.drag.is_none()
+            && let Some((from, _)) = app.thumb_drag
+        {
             if let Some(pp) = ui.input(|i| i.pointer.interact_pos()) {
                 let to =
                     rects.iter().find(|(_, r)| r.contains(pp)).map(|(i, r)| if pp.x > r.center().x { i + 1 } else { *i }).unwrap_or(doc.slides.len());
@@ -230,3 +476,7 @@ pub fn outline_pane(app: &mut SlideApp, ui: &mut Ui) {
         },
     );
 }
+
+#[cfg(test)]
+#[path = "sorter_tests.rs"]
+mod ui_tests;
diff --git a/crates/ui-egui/src/sorter_tests.rs b/crates/ui-egui/src/sorter_tests.rs
new file mode 100644
index 00000000..3ab3d215
--- /dev/null
+++ b/crates/ui-egui/src/sorter_tests.rs
@@ -0,0 +1,171 @@
+//! Slide Sorter sections: add, rename, collapse, and dragging a whole section.
+
+use deckcraft_engine::Session;
+use egui::Pos2;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn harness(with_sections: bool) -> Harness<'static, SlideApp> {
+    let mut s = Session::with_new();
+    for _ in 0..3 {
+        s.execute("slide.new", &json!({})).unwrap();
+    }
+    if with_sections {
+        s.execute("section.add", &json!({"name": "Alpha", "at": 0})).unwrap();
+        s.execute("section.add", &json!({"name": "Beta", "at": 2})).unwrap();
+    }
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.view = crate::ViewMode::Sorter;
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn section_names(h: &Harness<'_, SlideApp>) -> Vec<String> {
+    h.state().session.active().unwrap().doc.sections.iter().map(|s| s.name.clone()).collect()
+}
+
+fn section_slides(h: &Harness<'_, SlideApp>) -> Vec<Vec<u32>> {
+    h.state().session.active().unwrap().doc.sections.iter().map(|s| s.slides.iter().map(|id| id.0).collect()).collect()
+}
+
+fn double_click(h: &mut Harness<'_, SlideApp>, p: Pos2) {
+    h.hover_at(p);
+    h.run_steps(1);
+    for _ in 0..2 {
+        for pressed in [true, false] {
+            h.event(egui::Event::PointerButton { pos: p, button: egui::PointerButton::Primary, pressed, modifiers: egui::Modifiers::NONE });
+            h.run_steps(1);
+        }
+    }
+    h.run_steps(2);
+}
+
+fn drag(h: &mut Harness<'_, SlideApp>, from: Pos2, to: Pos2) {
+    h.hover_at(from);
+    h.run_steps(1);
+    h.drag_at(from);
+    h.run_steps(1);
+    for i in 1..=6 {
+        let t = i as f32 / 6.0;
+        h.hover_at(from + (to - from) * t);
+        h.run_steps(1);
+    }
+    h.drop_at(to);
+    h.run_steps(3);
+}
+
+#[test]
+fn drop_slot_and_move_dest() {
+    assert_eq!(super::drop_slot(&[10.0, 40.0, 70.0], 0.0), 0);
+    assert_eq!(super::drop_slot(&[10.0, 40.0, 70.0], 20.0), 1);
+    assert_eq!(super::drop_slot(&[10.0, 40.0, 70.0], 100.0), 3);
+    assert_eq!(super::move_dest(1, 1), None);
+    assert_eq!(super::move_dest(1, 2), None);
+    assert_eq!(super::move_dest(1, 0), Some(0));
+    assert_eq!(super::move_dest(0, 2), Some(1));
+}
+
+#[test]
+fn add_section_splits_at_the_current_slide() {
+    let mut h = harness(false);
+    assert!(h.query_by_label("Slide 4").is_some());
+    assert!(section_names(&h).is_empty());
+    h.get_by_label("Add Section").click();
+    h.run_steps(3);
+    assert_eq!(section_names(&h), ["Default Section", "Untitled Section"]);
+    let slides = section_slides(&h);
+    assert_eq!(slides[0].len(), 3);
+    assert_eq!(slides[1].len(), 1);
+    assert!(h.query_by_label("Default Section").is_some());
+    assert!(h.query_by_label("Untitled Section").is_some());
+    assert!(h.query_by_label("Slide 1").is_some() && h.query_by_label("Slide 4").is_some());
+}
+
+#[test]
+fn collapse_hides_that_sections_slides_and_expand_brings_them_back() {
+    let mut h = harness(true);
+    assert_eq!(section_names(&h), ["Alpha", "Beta"]);
+    assert_eq!(section_slides(&h).iter().map(|s| s.len()).collect::<Vec<_>>(), [2, 2]);
+    assert!(h.query_by_label("Slide 1").is_some() && h.query_by_label("Slide 4").is_some());
+    h.get_by_label("Collapse Beta").click();
+    h.run_steps(2);
+    assert!(h.query_by_label("Slide 1").is_some() && h.query_by_label("Slide 2").is_some());
+    assert!(h.query_by_label("Slide 3").is_none() && h.query_by_label("Slide 4").is_none());
+    assert!(h.query_by_label("Expand Beta").is_some());
+    h.get_by_label("Expand Beta").click();
+    h.run_steps(2);
+    assert!(h.query_by_label("Slide 3").is_some() && h.query_by_label("Slide 4").is_some());
+}
+
+#[test]
+fn double_click_renames_and_switching_documents_drops_the_draft() {
+    let mut h = harness(true);
+    let beta = h.get_by_label("Beta").rect().center();
+    double_click(&mut h, beta);
+    assert!(h.state().sorter.renaming.is_some(), "double-click starts renaming");
+    h.event(egui::Event::Text("Gamma".into()));
+    h.run_steps(1);
+    h.key_press(egui::Key::Enter);
+    h.run_steps(3);
+    assert_eq!(section_names(&h), ["Alpha", "Gamma"]);
+    assert!(h.state().sorter.renaming.is_none());
+
+    // Past the double-click window, so the next two clicks count as a new double-click.
+    h.run_steps(25);
+    let gamma = h.get_by_label("Gamma").rect().center();
+    double_click(&mut h, gamma);
+    assert!(h.state().sorter.renaming.is_some());
+    h.event(egui::Event::Text("Nope".into()));
+    h.run_steps(1);
+    h.key_press(egui::Key::Escape);
+    h.run_steps(3);
+    assert_eq!(section_names(&h), ["Alpha", "Gamma"]);
+    assert!(h.query_by_label("Nope").is_none());
+
+    h.run_steps(25);
+    let gamma = h.get_by_label("Gamma").rect().center();
+    double_click(&mut h, gamma);
+    assert!(h.state().sorter.renaming.is_some());
+    h.event(egui::Event::Text("Draft".into()));
+    h.run_steps(1);
+    h.state_mut().run("file.new", json!({})).unwrap();
+    h.run_steps(2);
+    assert!(h.state().sorter.renaming.is_none(), "a different presentation drops the draft");
+    h.state_mut().session.set_active(0);
+    h.run_steps(2);
+    assert_eq!(section_names(&h), ["Alpha", "Gamma"]);
+}
+
+#[test]
+fn dragging_a_section_moves_it_and_keeps_it_collapsed() {
+    let mut h = harness(true);
+    let before = section_slides(&h);
+    h.get_by_label("Collapse Beta").click();
+    h.run_steps(2);
+    let (alpha, beta) = (h.get_by_label("Alpha").rect(), h.get_by_label("Beta").rect());
+    assert!(beta.top() > alpha.bottom());
+    drag(&mut h, beta.center(), Pos2::new(alpha.center().x, alpha.top() - 4.0));
+    assert_eq!(section_names(&h), ["Beta", "Alpha"]);
+    let after = section_slides(&h);
+    assert_eq!(after[0], before[1]);
+    assert_eq!(after[1], before[0]);
+    let doc = &h.state().session.active().unwrap().doc;
+    let order: Vec<u32> = doc.slides.iter().map(|s| s.id.0).collect();
+    let expect: Vec<u32> = after.iter().flatten().copied().collect();
+    assert_eq!(order, expect, "slides follow the section order");
+    assert!(h.query_by_label("Expand Beta").is_some(), "Beta stays collapsed after the move");
+    assert!(h.query_by_label("Slide 1").is_none() && h.query_by_label("Slide 2").is_none());
+    assert!(h.query_by_label("Slide 3").is_some() && h.query_by_label("Slide 4").is_some());
+    let (beta, alpha) = (h.get_by_label("Beta").rect(), h.get_by_label("Alpha").rect());
+    assert!(beta.top() < alpha.top());
+}
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..3fa4f591 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,8 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Sorter sections: add, rename, collapse, drag a whole section; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -85,6 +83,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
 | Drag and drop of files and between thumbnails | yes | yes |
+| Slide Sorter sections: a bar per section, add, rename in place, collapse, drag the whole section (its slides move with it) | yes | yes |
 | Image paste from the clipboard | yes | macOS yes; Windows and Linux no (#53) |
 | Font menu: every installed family with its faces | yes | families yes; only Regular/Bold/Italic faces (#69) |
 
@@ -148,6 +147,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Slide Sorter draws a bar per section: Add Section, rename in place, collapse, and drag the bar to move the section and its slides |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 8f935a86970890f8f0d193e62b16847e3d49e9ed Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:52:06 +0300
Subject: [PATCH 207/376] Metafile: EMF+ arcs, convex clip paths, wrapped
 strings, nested metafiles

Arcs and pies; clip paths and regions clip to their convex outline instead
of the bounding rectangle; DrawString wraps to the layout width; glyph-index
driver strings in the Windows core fonts map back to text; metafile images
draw their nested picture.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/metafile/src/canvas.rs  |  18 +-
 crates/metafile/src/clip.rs    | 220 +++++++++++------
 crates/metafile/src/emfplus.rs | 423 ++++++++++++++++++++++++++-------
 crates/metafile/src/tests.rs   |  73 +++++-
 4 files changed, 565 insertions(+), 169 deletions(-)

diff --git a/crates/metafile/src/canvas.rs b/crates/metafile/src/canvas.rs
index ddb4b299..482501b4 100644
--- a/crates/metafile/src/canvas.rs
+++ b/crates/metafile/src/canvas.rs
@@ -306,8 +306,8 @@ pub(crate) struct Canvas {
     in_path: bool,
     path: Vec<Op>,
     full: bool,
-    /// Device clip rectangle `[l, t, r, b]` applied to everything drawn (EMF+ sets it).
-    clip: Option<[f64; 4]>,
+    /// Convex device clip polygon applied to everything drawn (EMF+ sets it).
+    clip: Option<Vec<P>>,
 }
 
 impl Canvas {
@@ -341,12 +341,13 @@ impl Canvas {
     }
 
     fn push(&mut self, raw: Raw) {
-        match self.clip {
+        match self.clip.take() {
             None => self.push_raw(raw),
             Some(c) => {
-                for r in crate::clip::clip_raw(raw, c) {
+                for r in crate::clip::clip_raw(raw, &c) {
                     self.push_raw(r);
                 }
+                self.clip = Some(c);
             }
         }
     }
@@ -472,8 +473,8 @@ impl Canvas {
         self.brush = brush;
     }
 
-    /// Sets the device clip rectangle `[l, t, r, b]` (None: unclipped).
-    pub fn set_clip(&mut self, clip: Option<[f64; 4]>) {
+    /// Sets the convex device clip polygon (None: unclipped).
+    pub fn set_clip(&mut self, clip: Option<Vec<P>>) {
         self.clip = clip;
     }
 
@@ -494,6 +495,11 @@ impl Canvas {
         self.text.font = Some(Arc::new(font));
     }
 
+    /// Pushes an item already in device units (a nested metafile's drawing).
+    pub fn push_device(&mut self, raw: Raw) {
+        self.push(raw);
+    }
+
     /// Fills logical `ops` with a ready-made tile, laid from the device origin.
     pub fn tile_shape(&mut self, ops: &[Op], tile: Arc<RawTile>) {
         let dev: Vec<Op> = ops.iter().map(|o| self.map_op(*o)).collect();
diff --git a/crates/metafile/src/clip.rs b/crates/metafile/src/clip.rs
index b0db77c3..8290dd37 100644
--- a/crates/metafile/src/clip.rs
+++ b/crates/metafile/src/clip.rs
@@ -1,7 +1,8 @@
-//! Clipping drawn output to a device rectangle (EMF+ clip rectangles, paths and regions are
-//! reduced to their bounding rectangle). Shapes wholly inside pass unchanged; shapes crossing the
-//! edge are flattened and cut: fills with Sutherland–Hodgman per subpath, outlines with
-//! Liang–Barsky per segment. Bitmaps are cropped and text gets a clip rectangle.
+//! Clipping drawn output to a convex device polygon (EMF+ clip rectangles, and clip paths and
+//! regions that are convex; others are reduced to their bounding rectangle). Shapes wholly inside
+//! pass unchanged; shapes crossing the edge are flattened and cut: fills with Sutherland–Hodgman
+//! per subpath, outlines with Cyrus–Beck per segment. Bitmaps are cropped (and masked outside a
+//! non-rectangular polygon) and text gets the polygon's bounding rectangle.
 
 use crate::canvas::Raw;
 use crate::dib::Rgba;
@@ -37,35 +38,129 @@ pub(crate) fn intersect(a: [f64; 4], b: [f64; 4]) -> [f64; 4] {
     if r[2] < r[0] || r[3] < r[1] { [r[0], r[1], r[0], r[1]] } else { r }
 }
 
-fn inside(b: [f64; 4], c: [f64; 4]) -> bool {
-    b[0] >= c[0] && b[1] >= c[1] && b[2] <= c[2] && b[3] <= c[3]
+/// A rectangle `[l, t, r, b]` as a polygon.
+pub(crate) fn rect_poly([l, t, r, b]: [f64; 4]) -> Vec<P> {
+    vec![(l, t), (r, t), (r, b), (l, b)]
+}
+
+/// The bounding box of a point list.
+pub(crate) fn pts_bbox(pts: &[P]) -> Option<[f64; 4]> {
+    let (&f, rest) = pts.split_first()?;
+    Some(rest.iter().fold([f.0, f.1, f.0, f.1], |v, p| [v[0].min(p.0), v[1].min(p.1), v[2].max(p.0), v[3].max(p.1)]))
+}
+
+fn cross(a: P, b: P, p: P) -> f64 {
+    (b.0 - a.0) * (p.1 - a.1) - (b.1 - a.1) * (p.0 - a.0)
+}
+
+/// A convex clip polygon with positive orientation, or None when `pts` is not convex (or
+/// degenerate); duplicate and collinear points are dropped.
+pub(crate) fn convex(pts: &[P]) -> Option<Vec<P>> {
+    let mut v: Vec<P> = Vec::with_capacity(pts.len());
+    for &p in pts {
+        if !(p.0.is_finite() && p.1.is_finite()) {
+            return None;
+        }
+        if v.last().is_none_or(|q: &P| (q.0 - p.0).abs() > 1e-9 || (q.1 - p.1).abs() > 1e-9) {
+            v.push(p);
+        }
+    }
+    while v.len() > 1 && v.first() == v.last() {
+        v.pop();
+    }
+    let area: f64 = (0..v.len()).map(|i| cross((0.0, 0.0), v[i], v[(i + 1) % v.len()])).sum();
+    if v.len() < 3 || area.abs() < 1e-12 {
+        return None;
+    }
+    if area < 0.0 {
+        v.reverse();
+    }
+    let n = v.len();
+    let mut out = Vec::with_capacity(n);
+    for i in 0..n {
+        let c = cross(v[(i + n - 1) % n], v[i], v[(i + 1) % n]);
+        if c < -1e-9 * (1.0 + area.abs()) {
+            return None;
+        }
+        if c.abs() > 1e-12 {
+            out.push(v[i]);
+        }
+    }
+    (out.len() >= 3).then_some(out)
+}
+
+fn inside_poly(clip: &[P], p: P) -> bool {
+    (0..clip.len()).all(|i| cross(clip[i], clip[(i + 1) % clip.len()], p) >= -1e-9)
+}
+
+/// Whether the clip polygon is an axis-aligned rectangle.
+fn is_rect(clip: &[P]) -> bool {
+    pts_bbox(clip).is_some_and(|b| clip.len() == 4 && clip.iter().all(|p| (p.0 == b[0] || p.0 == b[2]) && (p.1 == b[1] || p.1 == b[3])))
+}
+
+/// Sutherland–Hodgman: `poly` cut by convex `clip`.
+pub(crate) fn clip_polygon(poly: &[P], clip: &[P]) -> Vec<P> {
+    let mut poly = poly.to_vec();
+    for i in 0..clip.len() {
+        let (a, b) = (clip[i], clip[(i + 1) % clip.len()]);
+        let keep = |p: P| cross(a, b, p) >= 0.0;
+        let cut = |p: P, q: P| {
+            let (cp, cq) = (cross(a, b, p), cross(a, b, q));
+            let t = cp / (cp - cq);
+            (p.0 + (q.0 - p.0) * t, p.1 + (q.1 - p.1) * t)
+        };
+        let mut next = Vec::with_capacity(poly.len() + 4);
+        for j in 0..poly.len() {
+            let (p, q) = (poly[(j + poly.len() - 1) % poly.len()], poly[j]);
+            match (keep(p), keep(q)) {
+                (true, true) => next.push(q),
+                (true, false) => next.push(cut(p, q)),
+                (false, true) => {
+                    next.push(cut(p, q));
+                    next.push(q);
+                }
+                (false, false) => {}
+            }
+        }
+        poly = next;
+        if poly.is_empty() {
+            break;
+        }
+    }
+    poly
 }
 
 fn disjoint(b: [f64; 4], c: [f64; 4]) -> bool {
     b[2] < c[0] || b[0] > c[2] || b[3] < c[1] || b[1] > c[3] || c[2] <= c[0] || c[3] <= c[1]
 }
 
-/// Clips one drawn item; a shape that is both filled and stroked comes back as two items.
-pub(crate) fn clip_raw(raw: Raw, c: [f64; 4]) -> Vec<Raw> {
+fn bbox_inside(b: [f64; 4], clip: &[P]) -> bool {
+    rect_poly(b).into_iter().all(|p| inside_poly(clip, p))
+}
+
+/// Clips one drawn item to a convex device polygon; a shape that is both filled and stroked comes
+/// back as two items. An empty polygon clips everything away.
+pub(crate) fn clip_raw(raw: Raw, clip: &[P]) -> Vec<Raw> {
+    let Some(cb) = pts_bbox(clip).filter(|_| clip.len() >= 3) else { return Vec::new() };
     match raw {
         Raw::Path { ops, fill, stroke, even_odd } => {
             let Some(b) = ops_bbox(&ops) else { return Vec::new() };
-            if inside(b, c) {
+            if bbox_inside(b, clip) {
                 return vec![Raw::Path { ops, fill, stroke, even_odd }];
             }
-            if disjoint(b, c) {
+            if disjoint(b, cb) {
                 return Vec::new();
             }
             let subs = flatten(&ops);
             let mut out = Vec::new();
             if fill.is_some() {
-                let f = clip_fill(&subs, c);
+                let f = clip_fill(&subs, clip);
                 if !f.is_empty() {
                     out.push(Raw::Path { ops: f, fill, stroke: None, even_odd });
                 }
             }
             if stroke.is_some() {
-                let s = clip_stroke(&subs, c);
+                let s = clip_stroke(&subs, clip);
                 if !s.is_empty() {
                     out.push(Raw::Path { ops: s, fill: None, stroke, even_odd });
                 }
@@ -74,18 +169,19 @@ pub(crate) fn clip_raw(raw: Raw, c: [f64; 4]) -> Vec<Raw> {
         }
         Raw::Pattern { ops, even_odd, tile } => {
             let Some(b) = ops_bbox(&ops) else { return Vec::new() };
-            if inside(b, c) {
+            if bbox_inside(b, clip) {
                 return vec![Raw::Pattern { ops, even_odd, tile }];
             }
-            if disjoint(b, c) {
+            if disjoint(b, cb) {
                 return Vec::new();
             }
-            let f = clip_fill(&flatten(&ops), c);
+            let f = clip_fill(&flatten(&ops), clip);
             if f.is_empty() { Vec::new() } else { vec![Raw::Pattern { ops: f, even_odd, tile }] }
         }
-        Raw::Bitmap { rect, img } => crop(rect, img, c).map(|(rect, img)| vec![Raw::Bitmap { rect, img }]).unwrap_or_default(),
+        Raw::Bitmap { rect, img } => crop(rect, img, clip).map(|(rect, img)| vec![Raw::Bitmap { rect, img }]).unwrap_or_default(),
         Raw::Text(mut t) => {
-            let cur = t.clip.map_or(c, |[a, b, d, e]| intersect(c, [f64::from(a), f64::from(b), f64::from(d), f64::from(e)]));
+            // Text clips to a rectangle: the one around the polygon.
+            let cur = t.clip.map_or(cb, |[a, b, d, e]| intersect(cb, [f64::from(a), f64::from(b), f64::from(d), f64::from(e)]));
             t.clip = Some(cur.map(|v| v as f32));
             vec![Raw::Text(t)]
         }
@@ -93,7 +189,7 @@ pub(crate) fn clip_raw(raw: Raw, c: [f64; 4]) -> Vec<Raw> {
 }
 
 /// Subpaths as point lists with their closed flag.
-fn flatten(ops: &[Op]) -> Vec<(Vec<P>, bool)> {
+pub(crate) fn flatten(ops: &[Op]) -> Vec<(Vec<P>, bool)> {
     let mut subs: Vec<(Vec<P>, bool)> = Vec::new();
     for op in ops {
         match *op {
@@ -128,45 +224,10 @@ fn flatten(ops: &[Op]) -> Vec<(Vec<P>, bool)> {
     subs
 }
 
-fn clip_fill(subs: &[(Vec<P>, bool)], c: [f64; 4]) -> Vec<Op> {
+fn clip_fill(subs: &[(Vec<P>, bool)], clip: &[P]) -> Vec<Op> {
     let mut ops = Vec::new();
     for (pts, _) in subs {
-        let mut poly = pts.clone();
-        // Left, top, right, bottom edges in turn.
-        for edge in 0..4 {
-            let keep = |p: P| match edge {
-                0 => p.0 >= c[0],
-                1 => p.1 >= c[1],
-                2 => p.0 <= c[2],
-                _ => p.1 <= c[3],
-            };
-            let cut = |a: P, b: P| {
-                let t = match edge {
-                    0 => (c[0] - a.0) / (b.0 - a.0),
-                    1 => (c[1] - a.1) / (b.1 - a.1),
-                    2 => (c[2] - a.0) / (b.0 - a.0),
-                    _ => (c[3] - a.1) / (b.1 - a.1),
-                };
-                (a.0 + (b.0 - a.0) * t, a.1 + (b.1 - a.1) * t)
-            };
-            let mut next = Vec::with_capacity(poly.len() + 4);
-            for i in 0..poly.len() {
-                let (a, b) = (poly[(i + poly.len() - 1) % poly.len()], poly[i]);
-                match (keep(a), keep(b)) {
-                    (true, true) => next.push(b),
-                    (true, false) => next.push(cut(a, b)),
-                    (false, true) => {
-                        next.push(cut(a, b));
-                        next.push(b);
-                    }
-                    (false, false) => {}
-                }
-            }
-            poly = next;
-            if poly.is_empty() {
-                break;
-            }
-        }
+        let poly = clip_polygon(pts, clip);
         if poly.len() >= 3 {
             ops.push(Op::M(poly[0]));
             ops.extend(poly[1..].iter().map(|p| Op::L(*p)));
@@ -176,7 +237,7 @@ fn clip_fill(subs: &[(Vec<P>, bool)], c: [f64; 4]) -> Vec<Op> {
     ops
 }
 
-fn clip_stroke(subs: &[(Vec<P>, bool)], c: [f64; 4]) -> Vec<Op> {
+fn clip_stroke(subs: &[(Vec<P>, bool)], clip: &[P]) -> Vec<Op> {
     let mut ops = Vec::new();
     for (pts, closed) in subs {
         let mut pts = pts.clone();
@@ -185,7 +246,7 @@ fn clip_stroke(subs: &[(Vec<P>, bool)], c: [f64; 4]) -> Vec<Op> {
         }
         let mut last: Option<P> = None;
         for w in pts.windows(2) {
-            let Some((a, b)) = segment(w[0], w[1], c) else {
+            let Some((a, b)) = segment(w[0], w[1], clip) else {
                 last = None;
                 continue;
             };
@@ -199,34 +260,40 @@ fn clip_stroke(subs: &[(Vec<P>, bool)], c: [f64; 4]) -> Vec<Op> {
     ops
 }
 
-/// Liang–Barsky: the part of segment `a`–`b` inside `c`.
-fn segment(a: P, b: P, c: [f64; 4]) -> Option<(P, P)> {
-    let (dx, dy) = (b.0 - a.0, b.1 - a.1);
+/// Cyrus–Beck: the part of segment `a`–`b` inside convex `clip`.
+fn segment(a: P, b: P, clip: &[P]) -> Option<(P, P)> {
+    let d = (b.0 - a.0, b.1 - a.1);
     let (mut t0, mut t1) = (0.0f64, 1.0f64);
-    for (p, q) in [(-dx, a.0 - c[0]), (dx, c[2] - a.0), (-dy, a.1 - c[1]), (dy, c[3] - a.1)] {
-        if p == 0.0 {
-            if q < 0.0 {
+    for i in 0..clip.len() {
+        let (e0, e1) = (clip[i], clip[(i + 1) % clip.len()]);
+        // Inside is cross(e0, e1, p) >= 0, linear in t along the segment.
+        let f0 = cross(e0, e1, a);
+        let df = (e1.0 - e0.0) * d.1 - (e1.1 - e0.1) * d.0;
+        if df == 0.0 {
+            if f0 < 0.0 {
                 return None;
             }
         } else {
-            let r = q / p;
-            if p < 0.0 {
-                t0 = t0.max(r);
+            let t = -f0 / df;
+            if df > 0.0 {
+                t0 = t0.max(t);
             } else {
-                t1 = t1.min(r);
+                t1 = t1.min(t);
             }
         }
     }
-    (t0 <= t1).then_some(((a.0 + dx * t0, a.1 + dy * t0), (a.0 + dx * t1, a.1 + dy * t1)))
+    (t0 <= t1).then_some(((a.0 + d.0 * t0, a.1 + d.1 * t0), (a.0 + d.0 * t1, a.1 + d.1 * t1)))
 }
 
-/// Crops a bitmap drawn into `rect` = `[x, y, w, h]` (device, positive extents) to `c`.
-fn crop(rect: [f64; 4], img: Rgba, c: [f64; 4]) -> Option<([f64; 4], Rgba)> {
+/// Crops a bitmap drawn into `rect` = `[x, y, w, h]` (device, positive extents) to the clip
+/// polygon's box; pixels outside a non-rectangular polygon turn transparent.
+fn crop(rect: [f64; 4], img: Rgba, clip: &[P]) -> Option<([f64; 4], Rgba)> {
     let [x, y, w, h] = rect;
     let b = [x, y, x + w, y + h];
-    if inside(b, c) {
+    if bbox_inside(b, clip) {
         return Some((rect, img));
     }
+    let c = pts_bbox(clip)?;
     if disjoint(b, c) || w <= 0.0 || h <= 0.0 || img.w == 0 || img.h == 0 {
         return None;
     }
@@ -239,12 +306,23 @@ fn crop(rect: [f64; 4], img: Rgba, c: [f64; 4]) -> Option<([f64; 4], Rgba)> {
     if x1 <= x0 || y1 <= y0 {
         return None;
     }
+    let mask = !is_rect(clip);
     let mut px = Vec::with_capacity((x1 - x0) * (y1 - y0) * 4);
     for row in y0..y1 {
         // Rows are top-down unless the image says otherwise.
         let r = if img.bottom_up { img.h - 1 - row } else { row };
         let s = (r * img.w + x0) * 4;
+        let start = px.len();
         px.extend_from_slice(img.px.get(s..s + (x1 - x0) * 4)?);
+        if mask {
+            let cy = y + (row as f64 + 0.5) / ky;
+            for (k, p) in px[start..].as_chunks_mut::<4>().0.iter_mut().enumerate() {
+                let cx = x + ((x0 + k) as f64 + 0.5) / kx;
+                if !inside_poly(clip, (cx, cy)) {
+                    p[3] = 0;
+                }
+            }
+        }
     }
     let out = [x + x0 as f64 / kx, y + y0 as f64 / ky, (x1 - x0) as f64 / kx, (y1 - y0) as f64 / ky];
     Some((out, Rgba { w: x1 - x0, h: y1 - y0, bottom_up: false, px }))
diff --git a/crates/metafile/src/emfplus.rs b/crates/metafile/src/emfplus.rs
index 465f2a1f..48d1af89 100644
--- a/crates/metafile/src/emfplus.rs
+++ b/crates/metafile/src/emfplus.rs
@@ -9,19 +9,23 @@
 //! - bitmaps (raw pixel formats, and PNG/JPEG/GIF/TIFF/BMP payloads) and strings (DrawString,
 //!   DrawDriverString with character codes);
 //! - world and page transforms, save/restore and containers;
-//! - clipping to rectangles, and to the bounding rectangle of clip paths and regions.
+//! - arcs and pies;
+//! - clipping to rectangles and convex clip paths and regions (others: their bounding rectangle);
+//! - nested metafile images, and glyph-index driver strings in the Windows core fonts.
 //!
-//! Not drawn yet: nested metafile images, glyph-index driver strings, arcs and pies, image
-//! attributes, and region combinations other than intersect and union.
+//! Not drawn yet: image attributes, glyph indices of other fonts, and region combinations other
+//! than intersect and union (XOR, exclude and complement keep the left area).
 
 use std::sync::Arc;
 
 use crate::bytes::Bytes;
+use crate::canvas::Raw;
 use crate::canvas::{BS_NULL, BS_SOLID, Brush, Canvas, LogFont, PS_NULL, Pen, RawTile, Xform, hatch_tile, mul};
-use crate::clip::{intersect, ops_bbox};
+use crate::clip::{clip_polygon, convex, flatten, ops_bbox, pts_bbox, rect_poly};
 use crate::dib::Rgba;
 use crate::geom::{Op, P};
 use crate::text::{ETO_CLIPPED, Font};
+use crate::{Item, Picture, Seg};
 
 /// "EMF+" as the comment identifier of an EMR_COMMENT holding EMF+ records.
 pub(crate) const EMF_PLUS: u32 = 0x2B46_4D45;
@@ -155,6 +159,23 @@ struct Format {
     line_align: u32,
 }
 
+/// A clip area: a convex polygon (empty clips everything), or None for infinite.
+type Area = Option<Vec<P>>;
+
+enum ImageData {
+    Bitmap(Rgba),
+    /// A nested WMF or EMF (EMF+) picture.
+    Meta(Picture),
+}
+
+thread_local! {
+    /// Nesting depth of metafile images being parsed, so a file of nested metafiles cannot run
+    /// the stack out.
+    static NESTING: std::cell::Cell<usize> = const { std::cell::Cell::new(0) };
+}
+/// Metafile images inside metafile images, at most.
+const MAX_NESTING: usize = 3;
+
 #[derive(Clone)]
 enum Obj {
     Brush(Fill),
@@ -163,11 +184,11 @@ enum Obj {
         width: f64,
     },
     Path(Vec<Op>),
-    Image(Arc<Rgba>),
+    Image(Arc<ImageData>),
     Font(FontObj),
     Format(Format),
     /// A region's bounding rectangle `[l, t, r, b]` in world units; None is infinite.
-    Region(Option<[f64; 4]>),
+    Region(Area),
 }
 
 /// An object arriving in several records: its id, type, total size and the bytes so far.
@@ -182,7 +203,7 @@ struct Saved {
     id: u32,
     world: Xform,
     page: f64,
-    clip: Option<[f64; 4]>,
+    clip: Area,
 }
 
 pub(crate) struct Plus {
@@ -191,8 +212,8 @@ pub(crate) struct Plus {
     dpi: f64,
     world: Xform,
     page: f64,
-    /// Device clip rectangle `[l, t, r, b]`; None is unclipped.
-    clip: Option<[f64; 4]>,
+    /// Convex device clip polygon; None is unclipped.
+    clip: Area,
     objects: Vec<Option<Obj>>,
     stack: Vec<Saved>,
     partial: Option<Partial>,
@@ -227,7 +248,7 @@ impl Plus {
     }
 
     fn painter(&self) -> Painter {
-        Painter { xf: self.xf(), clip: self.clip }
+        Painter { xf: self.xf(), clip: self.clip.clone() }
     }
 
     fn record(&mut self, cv: &mut Canvas, typ: u16, flags: u16, r: Bytes) -> Option<()> {
@@ -351,28 +372,43 @@ impl Plus {
             }
             0x4032 => {
                 let [x, y, w, h] = floats::<4>(r, 0)?;
-                let dev = self.device_rect(cv, [x, y, x + w, y + h]);
-                self.combine(flags, Some(dev))
+                let area = map_area(Some(rect_poly([x, y, x + w, y + h])), mul(self.xf(), cv.device_affine()));
+                self.combine(flags, area)
             }
             0x4033 => {
-                let b = ops_bbox(&self.path(id)?)?;
-                let dev = self.device_rect(cv, b);
-                self.combine(flags, Some(dev))
+                let area = map_area(Some(area_of_ops(&self.path(id)?)), mul(self.xf(), cv.device_affine()));
+                self.combine(flags, area)
             }
             0x4034 => {
                 let Some(Some(Obj::Region(reg))) = self.objects.get(id).cloned() else { return None };
-                let dev = reg.map(|b| self.device_rect(cv, b));
-                self.combine(flags, dev)
+                let area = map_area(reg, mul(self.xf(), cv.device_affine()));
+                self.combine(flags, area)
             }
             0x4035 => {
                 let [dx, dy] = floats::<2>(r, 0)?;
                 let a = mul(self.xf(), cv.device_affine());
                 let (ox, oy) = (dx * a[0] + dy * a[2], dx * a[1] + dy * a[3]);
                 if let Some(c) = self.clip.as_mut() {
-                    *c = [c[0] + ox, c[1] + oy, c[2] + ox, c[3] + oy];
+                    for p in c.iter_mut() {
+                        *p = (p.0 + ox, p.1 + oy);
+                    }
                 }
                 Some(())
             }
+            0x4010 => {
+                let fill = self.brush_of(flags, r.u32(0)?)?;
+                let [start, sweep] = floats::<2>(r, 4)?;
+                let rect = *rects(r, 12, 1, compressed)?.first()?;
+                self.painter().fill(cv, &arc_ops(rect, start, sweep, true), &fill);
+                Some(())
+            }
+            0x4011 | 0x4012 => {
+                let pen = self.pen(id)?;
+                let [start, sweep] = floats::<2>(r, 0)?;
+                let rect = *rects(r, 8, 1, compressed)?.first()?;
+                self.painter().stroke(cv, &arc_ops(rect, start, sweep, typ == 0x4011), pen);
+                Some(())
+            }
             _ => None,
         }
     }
@@ -385,48 +421,27 @@ impl Plus {
 
     fn push(&mut self, id: u32) {
         if self.stack.len() < MAX_STACK {
-            self.stack.push(Saved { id, world: self.world, page: self.page, clip: self.clip });
+            self.stack.push(Saved { id, world: self.world, page: self.page, clip: self.clip.clone() });
         }
     }
 
     fn pop(&mut self, id: u32) {
         if let Some(i) = self.stack.iter().rposition(|s| s.id == id) {
-            let s = &self.stack[i];
+            let s = self.stack.swap_remove(i);
             (self.world, self.page, self.clip) = (s.world, s.page, s.clip);
             self.stack.truncate(i);
         }
     }
 
-    /// A world rectangle `[l, t, r, b]` as the device rectangle around it.
-    fn device_rect(&self, cv: &Canvas, [l, t, r, b]: [f64; 4]) -> [f64; 4] {
-        let a = mul(self.xf(), cv.device_affine());
-        let pts = [(l, t), (r, t), (l, b), (r, b)].map(|p| apply(a, p));
-        let xs = pts.map(|p| p.0);
-        let ys = pts.map(|p| p.1);
-        let min = |v: [f64; 4]| v.iter().copied().fold(f64::INFINITY, f64::min);
-        let max = |v: [f64; 4]| v.iter().copied().fold(f64::NEG_INFINITY, f64::max);
-        [min(xs), min(ys), max(xs), max(ys)]
-    }
-
-    /// Combines a new clip area (None: infinite) with the current one under the record's combine
-    /// mode: replace, intersect and union (as the rectangle around both). XOR, exclude and
-    /// complement leave the clip as it was.
-    fn combine(&mut self, flags: u16, new: Option<[f64; 4]>) -> Option<()> {
-        if new.is_some_and(|c| !c.iter().all(|v| v.is_finite())) {
-            return None;
-        }
+    /// Combines a new clip area with the current one under the record's combine mode: replace,
+    /// intersect and union (as the rectangle around both). XOR, exclude and complement leave the
+    /// clip as it was.
+    fn combine(&mut self, flags: u16, new: Area) -> Option<()> {
         self.clip = match (flags >> 8) & 0xF {
             0 => new,
-            1 => match (self.clip, new) {
-                (None, n) => n,
-                (c, None) => c,
-                (Some(a), Some(b)) => Some(intersect(a, b)),
-            },
-            2 => match (self.clip, new) {
-                (Some(a), Some(b)) => Some([a[0].min(b[0]), a[1].min(b[1]), a[2].max(b[2]), a[3].max(b[3])]),
-                _ => None,
-            },
-            _ => self.clip,
+            1 => area_intersect(self.clip.take(), new),
+            2 => area_union(self.clip.take(), new),
+            _ => self.clip.take(),
         };
         Some(())
     }
@@ -489,7 +504,7 @@ impl Plus {
         }
     }
 
-    fn image(&self, id: usize) -> Option<Arc<Rgba>> {
+    fn image(&self, id: usize) -> Option<Arc<ImageData>> {
         match self.objects.get(id)? {
             Some(Obj::Image(img)) => Some(img.clone()),
             _ => None,
@@ -509,7 +524,14 @@ impl Plus {
 
     /// DrawImage and DrawImagePoints: the source rectangle (pixels) cut from the image, drawn
     /// into world rectangle `dst` = `[x, y, w, h]`.
-    fn draw_image(&self, cv: &mut Canvas, img: &Rgba, r: Bytes, dst: [f64; 4]) -> Option<()> {
+    fn draw_image(&self, cv: &mut Canvas, img: &ImageData, r: Bytes, dst: [f64; 4]) -> Option<()> {
+        let img = match img {
+            ImageData::Bitmap(b) => b,
+            ImageData::Meta(pic) => {
+                self.painter().picture(cv, dst, pic);
+                return Some(());
+            }
+        };
         let [sx, sy, sw, sh] = floats::<4>(r, 8)?;
         let src = if r.u32(4)? == 2 { [sx, sy, sw, sh].map(|v| v.round().clamp(-1.0e9, 1.0e9) as i64) } else { [0; 4] };
         let (part, dst) = crate::dib::clip_blit(img, src, dst)?;
@@ -552,7 +574,14 @@ impl Plus {
         let units: Vec<u16> = (0..len).map(|i| r.u16(28 + i * 2)).collect::<Option<_>>()?;
         let lf = self.log_font(&font);
         let em = f64::from(-lf.font.height);
-        let lines: Vec<&[u16]> = units.split(|u| *u == 0x0A).collect();
+        let wrap = w > 0.0 && fmt.flags & 0x1000 == 0;
+        let lines: Vec<Vec<u16>> = units
+            .split(|u| *u == 0x0A)
+            .flat_map(|l| {
+                let l: Vec<u16> = l.iter().copied().filter(|u| *u != 0x0D).collect();
+                if wrap { wrap_line(&l, w, em) } else { vec![l] }
+            })
+            .collect();
         let line_h = em * 1.2;
         let (ax, ta_h) = match fmt.align {
             1 => (x + w / 2.0, TA_CENTER),
@@ -568,11 +597,10 @@ impl Plus {
         let clip = (w > 0.0 && h > 0.0 && fmt.flags & 0x4000 == 0).then_some([x, y, x + w, y + h]);
         let p = self.painter();
         for (i, line) in lines.iter().enumerate() {
-            let line: Vec<u16> = line.iter().copied().filter(|u| *u != 0x0D).collect();
             if line.is_empty() {
                 continue;
             }
-            let (text, dx) = crate::text::decode_utf16(&line, &[]);
+            let (text, dx) = crate::text::decode_utf16(line, &[]);
             let at = (ax, top + line_h * i as f64);
             let (at, ta) = if fmt.line_align == 2 && lines.len() == 1 { ((ax, y + h), ta_h | TA_BOTTOM) } else { (at, ta_h) };
             p.text(cv, at, text, dx, TextStyle { color, font: lf.clone(), align: ta, clip }, IDENTITY);
@@ -585,12 +613,13 @@ impl Plus {
         let font = self.font(usize::from(flags & 0xFF))?;
         let color = self.brush_of(flags, r.u32(0)?)?.color();
         let opts = r.u32(4)?;
-        if opts & 1 == 0 {
-            // Glyph indices into the font: the metafile crate knows no fonts to map them back.
-            return None;
-        }
         let n = (r.u32(12)? as usize).min(MAX_CHARS);
-        let units: Vec<u16> = (0..n).map(|i| r.u16(16 + i * 2)).collect::<Option<_>>()?;
+        let mut units: Vec<u16> = (0..n).map(|i| r.u16(16 + i * 2)).collect::<Option<_>>()?;
+        if opts & 1 == 0 {
+            // Glyph indices into the font. The crate knows no fonts, but the classic Windows core
+            // fonts keep the standard Macintosh glyph order for ASCII, so those map back.
+            units = glyphs_to_chars(&font.family, &units)?;
+        }
         let pos = points(r, 16 + n * 2, n, false)?;
         let m = if r.u32(8)? != 0 { matrix(r, 16 + n * 10)? } else { IDENTITY };
         let lf = self.log_font(&font);
@@ -631,7 +660,7 @@ struct TextStyle {
 /// canvas's GDI state back.
 struct Painter {
     xf: Xform,
-    clip: Option<[f64; 4]>,
+    clip: Area,
 }
 
 impl Painter {
@@ -639,7 +668,7 @@ impl Painter {
         let world = cv.world();
         cv.save_dc();
         cv.modify_world(mul(mul(pre, self.xf), world), 4);
-        cv.set_clip(self.clip);
+        cv.set_clip(self.clip.clone());
     }
 
     fn end(&self, cv: &mut Canvas) {
@@ -691,6 +720,62 @@ impl Painter {
         self.end(cv);
     }
 
+    /// A nested metafile's picture stretched into world rectangle `dst` = `[x, y, w, h]`.
+    fn picture(&self, cv: &mut Canvas, [x, y, w, h]: [f64; 4], pic: &Picture) {
+        self.begin(cv, IDENTITY);
+        let (sx, sy) = (w / f64::from(pic.width), h / f64::from(pic.height));
+        let m = mul([sx, 0.0, 0.0, sy, x, y], cv.device_affine());
+        let scale = (m[0] * m[3] - m[1] * m[2]).abs().sqrt();
+        let pt = |a: f32, b: f32| apply(m, (f64::from(a), f64::from(b)));
+        let ops = |segs: &[Seg]| -> Vec<Op> {
+            segs.iter()
+                .map(|s| match *s {
+                    Seg::Move(a, b) => Op::M(pt(a, b)),
+                    Seg::Line(a, b) => Op::L(pt(a, b)),
+                    Seg::Cubic(a, b, c, d, e, f) => Op::C(pt(a, b), pt(c, d), pt(e, f)),
+                    Seg::Close => Op::Z,
+                })
+                .collect()
+        };
+        for item in &pic.items {
+            if cv.full() {
+                break;
+            }
+            let raw = match item {
+                Item::Path { segs, fill, stroke, even_odd } => {
+                    Raw::Path { ops: ops(segs), fill: *fill, stroke: stroke.map(|(c, w)| (c, f64::from(w) * scale)), even_odd: *even_odd }
+                }
+                Item::Pattern { segs, even_odd, tile } => Raw::Pattern {
+                    ops: ops(segs),
+                    even_odd: *even_odd,
+                    tile: Arc::new(RawTile {
+                        w: tile.width as usize,
+                        h: tile.height as usize,
+                        px: tile.rgba.clone(),
+                        cell: f64::from(tile.cell[0]) * scale,
+                    }),
+                },
+                Item::Bitmap { rect, width, height, rgba } => {
+                    let (a, b) = (pt(rect[0], rect[1]), pt(rect[0] + rect[2], rect[1] + rect[3]));
+                    let mut img = Rgba { w: *width as usize, h: *height as usize, bottom_up: false, px: rgba.clone() };
+                    crate::dib::flip(&mut img, a.0 > b.0, a.1 > b.1);
+                    Raw::Bitmap { rect: [a.0.min(b.0), a.1.min(b.1), (b.0 - a.0).abs(), (b.1 - a.1).abs()], img }
+                }
+                Item::Text(t) => {
+                    let mut t = t.clone();
+                    t.transform = mul(t.transform, m);
+                    if let Some([x0, y0, x1, y1]) = t.clip {
+                        let (p, q) = (pt(x0, y0), pt(x1, y1));
+                        t.clip = Some([p.0.min(q.0) as f32, p.1.min(q.1) as f32, p.0.max(q.0) as f32, p.1.max(q.1) as f32]);
+                    }
+                    Raw::Text(t)
+                }
+            };
+            cv.push_device(raw);
+        }
+        self.end(cv);
+    }
+
     fn text(&self, cv: &mut Canvas, at: P, text: String, dx: Vec<f32>, style: TextStyle, pre: Xform) {
         self.begin(cv, pre);
         cv.set_text_style(style.color, style.font, style.align);
@@ -756,7 +841,8 @@ fn brush(r: Bytes, off: usize) -> Option<Fill> {
             let bflags = d.u32(0)?;
             let wrap = d.u32(4)?;
             let (xf, off) = if bflags & 0x2 != 0 { (matrix(d, 8)?, 32) } else { (IDENTITY, 8) };
-            Some(Fill::Texture { img: Arc::new(image(d.tail(off)?)?), wrap, xf })
+            let ImageData::Bitmap(img) = image(d.tail(off)?)? else { return None };
+            Some(Fill::Texture { img: Arc::new(img), wrap, xf })
         }
         3 => path_gradient(d),
         4 => linear_gradient(d),
@@ -879,56 +965,133 @@ fn path(r: Bytes) -> Option<Vec<Op>> {
     Some(ops)
 }
 
-/// A region object reduced to its bounding rectangle (None: infinite).
+/// A region object as a convex area in world units (non-convex parts become their bounding
+/// rectangle).
 fn region(r: Bytes) -> Option<Obj> {
-    region_node(r, 8, 0).map(|(b, _)| Obj::Region(b))
+    region_node(r, 8, 0).map(|(a, _)| Obj::Region(a))
 }
 
-/// One region node at `off`: its bounds (None: infinite; an empty node is a zero rectangle) and
-/// its length in bytes.
-fn region_node(r: Bytes, off: usize, depth: usize) -> Option<(Option<[f64; 4]>, usize)> {
+/// One region node at `off`: its area and its length in bytes.
+fn region_node(r: Bytes, off: usize, depth: usize) -> Option<(Area, usize)> {
     if depth > MAX_REGION_DEPTH {
         return None;
     }
     match r.u32(off)? {
         0x1000_0000 => {
             let [x, y, w, h] = floats::<4>(r, off + 4)?;
-            Some((Some([x.min(x + w), y.min(y + h), x.max(x + w), y.max(y + h)]), 20))
+            Some((Some(rect_poly([x.min(x + w), y.min(y + h), x.max(x + w), y.max(y + h)])), 20))
         }
         0x1000_0001 => {
             let size = r.u32(off + 4)? as usize;
-            let b = ops_bbox(&path(r.tail(off + 8)?)?).unwrap_or([0.0; 4]);
-            Some((Some(b), 8usize.checked_add(size)?))
+            let area = path(r.tail(off + 8)?).map(|ops| area_of_ops(&ops)).unwrap_or_default();
+            Some((Some(area), 8usize.checked_add(size)?))
         }
-        0x1000_0002 => Some((Some([0.0; 4]), 4)),
+        0x1000_0002 => Some((Some(Vec::new()), 4)),
         0x1000_0003 => Some((None, 4)),
-        mode @ 1..=5 => {
+        mode @ 0..=5 => {
             let (a, la) = region_node(r, off + 4, depth + 1)?;
             let (b, lb) = region_node(r, off.checked_add(4 + la)?, depth + 1)?;
             let out = match mode {
-                1 => match (a, b) {
-                    (None, x) | (x, None) => x,
-                    (Some(a), Some(b)) => Some(intersect(a, b)),
-                },
-                2 => match (a, b) {
-                    (Some(a), Some(b)) => Some([a[0].min(b[0]), a[1].min(b[1]), a[2].max(b[2]), a[3].max(b[3])]),
-                    _ => None,
-                },
+                0 => b,
+                1 => area_intersect(a, b),
+                2 => area_union(a, b),
                 // XOR, exclude, complement: the left area bounds the result closely enough.
                 _ => a,
             };
             Some((out, (4 + la).checked_add(lb)?))
         }
-        // Replace: the right-hand area.
-        0 => {
-            let (_, la) = region_node(r, off + 4, depth + 1)?;
-            let (b, lb) = region_node(r, off.checked_add(4 + la)?, depth + 1)?;
-            Some((b, (4 + la).checked_add(lb)?))
+        _ => None,
+    }
+}
+
+/// The area a path encloses: its outline when that is one convex figure, else the rectangle
+/// around it.
+fn area_of_ops(ops: &[Op]) -> Vec<P> {
+    let subs = flatten(ops);
+    if let [(pts, _)] = subs.as_slice()
+        && let Some(c) = convex(pts)
+    {
+        return c;
+    }
+    ops_bbox(ops).map(rect_poly).unwrap_or_default()
+}
+
+fn area_intersect(a: Area, b: Area) -> Area {
+    match (a, b) {
+        (None, x) | (x, None) => x,
+        (Some(a), Some(b)) if a.len() >= 3 && b.len() >= 3 => Some(convex(&clip_polygon(&a, &b)).unwrap_or_default()),
+        _ => Some(Vec::new()),
+    }
+}
+
+fn area_union(a: Area, b: Area) -> Area {
+    match (a, b) {
+        (Some(a), Some(b)) => {
+            if a.len() < 3 {
+                return Some(b);
+            }
+            if b.len() < 3 {
+                return Some(a);
+            }
+            let all: Vec<P> = a.into_iter().chain(b).collect();
+            Some(pts_bbox(&all).map(rect_poly).unwrap_or_default())
         }
         _ => None,
     }
 }
 
+/// An area through an affine map (which keeps it convex; the orientation is put right again).
+fn map_area(a: Area, m: Xform) -> Area {
+    a.map(|pts| {
+        let mapped: Vec<P> = pts.iter().map(|p| apply(m, *p)).collect();
+        if mapped.len() < 3 { Vec::new() } else { convex(&mapped).unwrap_or_default() }
+    })
+}
+
+/// An elliptical arc in `rect` from `start` sweeping `sweep` degrees (clockwise on screen), as
+/// cubics; a pie adds the lines to and from the centre.
+fn arc_ops([l, t, r, b]: [f64; 4], start: f64, sweep: f64, pie: bool) -> Vec<Op> {
+    let (cx, cy, rx, ry) = ((l + r) / 2.0, (t + b) / 2.0, (r - l) / 2.0, (b - t) / 2.0);
+    let sweep = sweep.clamp(-360.0, 360.0);
+    // GDI+ angles are along rays from the centre; turn them into the ellipse's parameter.
+    let param = |deg: f64| {
+        let a = deg.to_radians();
+        (rx * a.sin()).atan2(ry * a.cos())
+    };
+    let t0 = param(start);
+    let mut dt = if sweep.abs() >= 360.0 { sweep.signum() * std::f64::consts::TAU } else { param(start + sweep) - t0 };
+    if sweep.abs() < 360.0 {
+        while sweep > 0.0 && dt < 0.0 {
+            dt += std::f64::consts::TAU;
+        }
+        while sweep < 0.0 && dt > 0.0 {
+            dt -= std::f64::consts::TAU;
+        }
+    }
+    let at = |t: f64| (cx + rx * t.cos(), cy + ry * t.sin());
+    let mut ops = Vec::with_capacity(8);
+    if pie {
+        ops.push(Op::M((cx, cy)));
+        ops.push(Op::L(at(t0)));
+    } else {
+        ops.push(Op::M(at(t0)));
+    }
+    let n = ((dt.abs() / std::f64::consts::FRAC_PI_2).ceil() as usize).clamp(1, 4);
+    let step = dt / n as f64;
+    let k = 4.0 / 3.0 * (step / 4.0).tan();
+    for i in 0..n {
+        let (a, e) = (t0 + step * i as f64, t0 + step * (i + 1) as f64);
+        let (p0, p3) = (at(a), at(e));
+        let c1 = (p0.0 - k * rx * a.sin(), p0.1 + k * ry * a.cos());
+        let c2 = (p3.0 + k * rx * e.sin(), p3.1 - k * ry * e.cos());
+        ops.push(Op::C(c1, c2, p3));
+    }
+    if pie {
+        ops.push(Op::Z);
+    }
+    ops
+}
+
 /// A font object: em size, unit, style flags, then the family name in UTF-16.
 fn font(r: Bytes) -> Option<Obj> {
     let em = f64::from(r.f32(4)?);
@@ -938,12 +1101,31 @@ fn font(r: Bytes) -> Option<Obj> {
     em.is_finite().then_some(Obj::Font(FontObj { em, unit: r.u32(8)?, style: r.u32(12)?, family }))
 }
 
-/// An image object: a bitmap of raw pixels or a compressed (PNG, JPEG, GIF…) file. Metafile
-/// images are not drawn yet.
-fn image(r: Bytes) -> Option<Rgba> {
-    if r.u32(4)? != 1 {
+/// An image object: a bitmap of raw pixels or a compressed (PNG, JPEG, GIF…) file, or a nested
+/// metafile.
+fn image(r: Bytes) -> Option<ImageData> {
+    match r.u32(4)? {
+        1 => bitmap(r).map(ImageData::Bitmap),
+        2 => metafile(r).map(ImageData::Meta),
+        _ => None,
+    }
+}
+
+/// A metafile image: type, size, then a WMF (placeable or not) or EMF file, parsed as a picture.
+fn metafile(r: Bytes) -> Option<Picture> {
+    let size = r.u32(12)? as usize;
+    let data = r.slice(16, size).or_else(|| r.tail(16).map(|t| t.0))?;
+    let depth = NESTING.with(|n| n.get());
+    if depth >= MAX_NESTING {
         return None;
     }
+    NESTING.with(|n| n.set(depth + 1));
+    let pic = crate::parse(data).ok();
+    NESTING.with(|n| n.set(depth));
+    pic.filter(|p| p.width > 0.0 && p.height > 0.0)
+}
+
+fn bitmap(r: Bytes) -> Option<Rgba> {
     let (w, h, stride) = (r.u32(8)? as i32, r.u32(12)? as i32, r.u32(16)? as i32);
     let format = r.u32(20)?;
     let data = r.tail(28)?;
@@ -1086,3 +1268,68 @@ fn ellipse_ops([l, t, r, b]: [f64; 4]) -> Vec<Op> {
         Op::Z,
     ]
 }
+
+/// Core fonts whose first glyphs follow the standard Macintosh order (glyph 3 is the space,
+/// glyphs 3..=97 are U+0020..=U+007E).
+const MAC_ORDER_FONTS: &[&str] =
+    &["arial", "arial black", "times new roman", "courier new", "verdana", "georgia", "tahoma", "trebuchet ms", "comic sans ms", "impact"];
+
+/// Glyph indices of a known font back to ASCII; None when the font is unknown or a glyph is
+/// outside the ASCII range.
+fn glyphs_to_chars(family: &str, glyphs: &[u16]) -> Option<Vec<u16>> {
+    let family = family.trim().to_ascii_lowercase();
+    if !MAC_ORDER_FONTS.contains(&family.as_str()) {
+        return None;
+    }
+    glyphs.iter().map(|g| (3..=97).contains(g).then_some(g + 29)).collect()
+}
+
+/// A rough advance for a character in ems: the metafile crate has no fonts, so line breaks for
+/// wrapped strings use typical proportional widths.
+fn char_em(u: u16) -> f64 {
+    match char::from_u32(u32::from(u)).unwrap_or('x') {
+        ' ' | 'i' | 'l' | 'j' | '.' | ',' | ':' | ';' | '\'' | '!' | '|' | 'I' | 'f' | 't' | 'r' => 0.3,
+        'm' | 'w' | 'M' | 'W' => 0.85,
+        c if c.is_ascii_uppercase() || c.is_ascii_digit() => 0.62,
+        c if (c as u32) >= 0x2E80 => 1.0,
+        _ => 0.52,
+    }
+}
+
+/// Greedy word wrap of one line to `width` world units at em size `em`; a word longer than the
+/// line breaks between characters.
+fn wrap_line(line: &[u16], width: f64, em: f64) -> Vec<Vec<u16>> {
+    if em <= 0.0 || !width.is_finite() {
+        return vec![line.to_vec()];
+    }
+    let fits = |l: &[u16]| l.iter().map(|u| char_em(*u) * em).sum::<f64>() <= width;
+    let mut out: Vec<Vec<u16>> = Vec::new();
+    let mut cur: Vec<u16> = Vec::new();
+    for word in line.split_inclusive(|u| *u == 0x20) {
+        let mut cand = cur.clone();
+        cand.extend_from_slice(word);
+        let trimmed = |v: &[u16]| v.iter().rposition(|u| *u != 0x20).map_or(0, |i| i + 1);
+        if fits(&cand[..trimmed(&cand)]) || cur.is_empty() && fits(&word[..trimmed(word)]) {
+            cur = cand;
+            continue;
+        }
+        if !cur.is_empty() {
+            let n = trimmed(&cur);
+            cur.truncate(n);
+            out.push(std::mem::take(&mut cur));
+        }
+        // A word wider than the line on its own: break it between characters.
+        for &u in word {
+            cur.push(u);
+            if !fits(&cur[..trimmed(&cur)]) && cur.len() > 1 {
+                cur.pop();
+                out.push(std::mem::take(&mut cur));
+                cur.push(u);
+            }
+        }
+    }
+    let n = cur.iter().rposition(|u| *u != 0x20).map_or(0, |i| i + 1);
+    cur.truncate(n);
+    out.push(cur);
+    out
+}
diff --git a/crates/metafile/src/tests.rs b/crates/metafile/src/tests.rs
index 6a23ad6c..7ad5071b 100644
--- a/crates/metafile/src/tests.rs
+++ b/crates/metafile/src/tests.rs
@@ -1715,10 +1715,16 @@ fn emfplus_driver_string_uses_character_codes_and_positions() {
     assert_eq!(t.dx, vec![6.0, 6.0]);
     assert_eq!(t.v_align, VAlign::Baseline);
     assert!(close(t.transform[4] as f32, 5.0) && close(t.transform[5] as f32, 30.0));
-    // Glyph indices (no CmapLookup) are skipped.
-    let gi = prec(0x4036, 0x8000, &cat(vec![h32(0xFF00_0000), h32(0), h32(0), h32(1), h16(36), f32s(&[0.0, 0.0])]));
-    let font = prec(0x4008, 0x0600, &font_obj("Arial", 10.0, 0, 0));
-    assert!(plus_pic(vec![font, gi]).items.is_empty());
+}
+
+#[test]
+fn emfplus_glyph_index_driver_strings_map_back_in_core_fonts_only() {
+    // Glyph indices (no CmapLookup): 36, 69 are "Ab" in Arial's standard glyph order.
+    let gi = || prec(0x4036, 0x8000, &cat(vec![h32(0xFF00_0000), h32(0), h32(0), h32(2), h16(36), h16(69), f32s(&[0.0, 0.0, 6.0, 0.0])]));
+    let p = plus_pic(vec![prec(0x4008, 0x0600, &font_obj("Arial", 10.0, 0, 0)), gi()]);
+    assert!(matches!(&p.items[0], Item::Text(t) if t.text == "Ab"), "{:?}", p.items);
+    // An unknown font's glyph indices cannot be mapped: nothing is drawn.
+    assert!(plus_pic(vec![prec(0x4008, 0x0600, &font_obj("Calibri", 10.0, 0, 0)), gi()]).items.is_empty());
 }
 
 #[test]
@@ -1784,3 +1790,62 @@ fn emfplus_region_clip_intersects_rectangles() {
     let p = plus_pic(vec![prec(0x4008, 0x0400 | 6, &region), prec(0x4034, 6, &[]), fill]);
     assert_eq!((p.width, p.height), (20.0, 20.0));
 }
+
+#[test]
+fn emfplus_pie_and_arc() {
+    // A quarter pie from 0 to 90 degrees in a 0..100 circle: centre, then (100, 50) round to (50, 100).
+    let pie = prec(0x4010, 0x8000, &cat(vec![h32(0xFF00_0000), f32s(&[0.0, 90.0]), f32s(&[0.0, 0.0, 100.0, 100.0])]));
+    let p = plus_pic(vec![pie]);
+    let (segs, fill, ..) = path_segs(&p.items[0]);
+    assert_eq!(fill, Some([0, 0, 0, 255]));
+    assert_eq!(segs[0], Seg::Move(0.0, 0.0));
+    assert_eq!(segs[1], Seg::Line(50.0, 0.0));
+    assert!(matches!(segs[2], Seg::Cubic(.., x, y) if close(x, 0.0) && close(y, 50.0)), "{segs:?}");
+    assert_eq!(segs[3], Seg::Close);
+    // A half-circle arc stroke is two cubics.
+    let pen = prec(0x4008, 0x0200, &solid_pen(0xFF00_0000, 1.0));
+    let arc = prec(0x4012, 0, &cat(vec![f32s(&[180.0, -180.0]), f32s(&[0.0, 0.0, 100.0, 100.0])]));
+    let p = plus_pic(vec![pen, arc]);
+    let (segs, ..) = path_segs(&p.items[0]);
+    assert_eq!(segs.len(), 3, "{segs:?}");
+}
+
+#[test]
+fn emfplus_convex_clip_path_cuts_to_the_shape_not_its_box() {
+    // A diamond clip path (0,50) (50,0) (100,50) (50,100): the corner of a full square fill is cut away.
+    let diamond = cat(vec![h32(0xDBC0_1002), h32(4), h32(0), f32s(&[0.0, 50.0, 50.0, 0.0, 100.0, 50.0, 50.0, 100.0]), vec![0, 1, 1, 0x81]]);
+    let fill = prec(0x400A, 0x8000, &cat(vec![h32(0xFF00_0000), h32(1), f32s(&[0.0, 0.0, 100.0, 100.0])]));
+    let p = plus_pic(vec![prec(0x4008, 0x0300 | 9, &diamond), prec(0x4033, 9, &[]), fill]);
+    let (segs, ..) = path_segs(&p.items[0]);
+    let pts: Vec<(f32, f32)> = segs.iter().filter_map(|s| if let Seg::Move(x, y) | Seg::Line(x, y) = s { Some((*x, *y)) } else { None }).collect();
+    assert!(!pts.iter().any(|(x, y)| close(*x, 0.0) && close(*y, 0.0)), "corner kept: {pts:?}");
+    assert!(pts.iter().all(|(x, y)| (x - 50.0).abs() + (y - 50.0).abs() <= 50.0 + 1e-3), "{pts:?}");
+}
+
+#[test]
+fn emfplus_draw_string_wraps_to_the_layout_width() {
+    let font = prec(0x4008, 0x0600, &font_obj("Arial", 10.0, 0, 0));
+    let text = "alpha beta gamma delta";
+    let s = prec(
+        0x401C,
+        0x8000,
+        &cat(vec![h32(0xFF00_0000), h32(9), h32(text.encode_utf16().count() as u32), f32s(&[0.0, 0.0, 60.0, 100.0]), u16s(text)]),
+    );
+    let fill = prec(0x400A, 0x8000, &cat(vec![h32(0xFFFF_FFFF), h32(1), f32s(&[0.0, 0.0, 60.0, 100.0])]));
+    let p = plus_pic(vec![fill, font, s]);
+    let lines: Vec<&str> = p.items.iter().filter_map(|i| if let Item::Text(t) = i { Some(t.text.as_str()) } else { None }).collect();
+    assert_eq!(lines, vec!["alpha beta", "gamma delta"]);
+}
+
+#[test]
+fn emfplus_nested_metafile_image_draws_its_items_into_the_destination() {
+    // The nested picture: a plain EMF with a 10 x 10 rectangle (white brush, black pen).
+    let inner = emf(&[erec(43, &cat(vec![e32(0), e32(0), e32(10), e32(10)]))], [0; 4], [0; 4]);
+    let obj = cat(vec![h32(0xDBC0_1002), h32(2), h32(3), h32(inner.len() as u32), inner]);
+    let p = plus_pic(vec![prec(0x4008, 0x0500 | 3, &obj), draw_image(3, [0.0, 0.0, 40.0, 20.0])]);
+    assert_eq!(p.items.len(), 1);
+    assert_eq!((p.width, p.height), (40.0, 20.0));
+    let (segs, fill, ..) = path_segs(&p.items[0]);
+    assert_eq!(fill, Some([255, 255, 255, 255]));
+    assert!(segs.contains(&Seg::Line(40.0, 20.0)), "{segs:?}");
+}

From 9f8c860f90169768a93c2136c807194ec018f5c9 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:52:25 +0300
Subject: [PATCH 208/376] PPTX corpus: themes, masters, effects and links; keep
 text Mouse Over actions

New owned corpus test on PowerPoint-shaped XML: a custom-theme deck with
shadow, glow, soft-edge and reflection effects and every common text and
shape hyperlink, and a two-master deck with its own themes and layouts.
The one loss it found: a:hlinkMouseOver on text runs was dropped; it is
now read into RunProps::hover and written back.
---
 crates/model/src/text.rs           |   3 +
 crates/pptx/src/read/dml.rs        |   1 +
 crates/pptx/src/write/dml.rs       |   7 +-
 crates/pptx/tests/corpus_themes.rs | 248 +++++++++++++++++++++++++++++
 docs/gaps.md                       |   5 +-
 5 files changed, 262 insertions(+), 2 deletions(-)
 create mode 100644 crates/pptx/tests/corpus_themes.rs

diff --git a/crates/model/src/text.rs b/crates/model/src/text.rs
index 6a1a7527..fcfaf5eb 100644
--- a/crates/model/src/text.rs
+++ b/crates/model/src/text.rs
@@ -345,6 +345,8 @@ pub struct RunProps {
     pub outline: Option<Line>,
     pub highlight: Option<ColorRef>,
     pub link: Option<Hyperlink>,
+    /// Action on mouse over (Insert ▸ Action ▸ Mouse Over on selected text, `a:hlinkMouseOver`).
+    pub hover: Option<Hyperlink>,
     pub lang: Option<String>,
     pub shadow: Option<crate::style::Shadow>,
     pub glow: Option<crate::style::Glow>,
@@ -376,6 +378,7 @@ impl RunProps {
             outline,
             highlight,
             link,
+            hover,
             lang,
             shadow,
             glow,
diff --git a/crates/pptx/src/read/dml.rs b/crates/pptx/src/read/dml.rs
index 0aee935c..1c95df19 100644
--- a/crates/pptx/src/read/dml.rs
+++ b/crates/pptx/src/read/dml.rs
@@ -512,6 +512,7 @@ pub fn rpr(imp: &mut Imp, part: &Part, r: &El) -> RunProps {
             "cs" => p.font_cs = e.attr("typeface").filter(|t| !t.is_empty()).map(String::from),
             "sym" => p.font_sym = e.attr("typeface").filter(|t| !t.is_empty()).map(String::from),
             "hlinkClick" => p.link = hyperlink(imp, part, e),
+            "hlinkMouseOver" => p.hover = hyperlink(imp, part, e),
             _ => {}
         }
     }
diff --git a/crates/pptx/src/write/dml.rs b/crates/pptx/src/write/dml.rs
index 16a069fe..cfe5a73f 100644
--- a/crates/pptx/src/write/dml.rs
+++ b/crates/pptx/src/write/dml.rs
@@ -589,7 +589,8 @@ pub fn rpr(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, r: &RunProps) {
         || r.font_ea.is_some()
         || r.font_cs.is_some()
         || r.font_sym.is_some()
-        || r.link.is_some();
+        || r.link.is_some()
+        || r.hover.is_some();
     if !has_kids {
         w.empty(tag, a);
         return;
@@ -624,6 +625,10 @@ pub fn rpr(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, r: &RunProps) {
     if let Some(h) = &r.link {
         hyperlink(w, x, o, "a:hlinkClick", h);
     }
+    // Schema order: hlinkClick, hlinkMouseOver.
+    if let Some(h) = &r.hover {
+        hyperlink(w, x, o, "a:hlinkMouseOver", h);
+    }
     w.close(tag);
 }
 
diff --git a/crates/pptx/tests/corpus_themes.rs b/crates/pptx/tests/corpus_themes.rs
new file mode 100644
index 00000000..80c41d20
--- /dev/null
+++ b/crates/pptx/tests/corpus_themes.rs
@@ -0,0 +1,248 @@
+//! Owned corpus: themes, several masters and layouts, shape effects (shadow, glow, soft edge,
+//! reflection) and hyperlinks and actions on text and shapes.
+//!
+//! The decks are built as PowerPoint writes them: a DeckCraft package whose theme, slides and
+//! relationships are replaced with PowerPoint-shaped XML, and a two-master deck built in the model.
+//! The check is open → save → reopen with nothing lost.
+
+use std::io::{Cursor, Read, Write};
+use std::sync::Arc;
+
+use deckcraft_model::style::Effects;
+use deckcraft_model::text::{Action, Hyperlink};
+use deckcraft_model::{LayoutType, Presentation, Shape, defaults};
+
+/// Replace (or add) parts of a package.
+fn repack(bytes: &[u8], parts: &[(&str, String)]) -> Vec<u8> {
+    let mut z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(Cursor::new(vec![]));
+    let opts = zip::write::SimpleFileOptions::default();
+    for i in 0..z.len() {
+        let mut f = z.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        if parts.iter().any(|(n, _)| *n == name) {
+            continue;
+        }
+        let mut data = vec![];
+        f.read_to_end(&mut data).expect("read");
+        out.start_file(name, opts).expect("start");
+        out.write_all(&data).expect("write");
+    }
+    for (n, xml) in parts {
+        out.start_file(*n, opts).expect("start");
+        out.write_all(xml.as_bytes()).expect("write");
+    }
+    out.finish().expect("finish").into_inner()
+}
+
+fn part(bytes: &[u8], name: &str) -> String {
+    let mut z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut s = String::new();
+    z.by_name(name).expect(name).read_to_string(&mut s).expect("utf8");
+    s
+}
+
+fn round_trip(p: &Presentation) -> Presentation {
+    deckcraft_pptx::import(&deckcraft_pptx::export(p).expect("export")).expect("reimport")
+}
+
+fn shapes_named<'a>(p: &'a Presentation, slide: usize) -> impl Fn(&str) -> &'a Shape {
+    move |n| p.slides[slide].shapes.iter().find(|s| s.name == n).unwrap_or_else(|| panic!("no shape {n}"))
+}
+
+const NS: &str = r#"xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main""#;
+
+fn sp(id: u32, name: &str, nv_extra: &str, x: u32, effects: &str, body: &str) -> String {
+    format!(
+        r#"<p:sp><p:nvSpPr><p:cNvPr id="{id}" name="{name}">{nv_extra}</p:cNvPr><p:cNvSpPr/><p:nvPr/></p:nvSpPr><p:spPr><a:xfrm><a:off x="{x}" y="1270000"/><a:ext cx="2540000" cy="1270000"/></a:xfrm><a:prstGeom prst="roundRect"><a:avLst/></a:prstGeom><a:solidFill><a:schemeClr val="accent1"/></a:solidFill><a:effectLst>{effects}</a:effectLst></p:spPr><p:txBody><a:bodyPr rtlCol="0" anchor="ctr"/><a:lstStyle/>{body}</p:txBody></p:sp>"#
+    )
+}
+
+/// A two-slide PowerPoint-style deck: a custom theme, effects on four shapes, and text and shape
+/// hyperlinks of every common kind.
+fn effects_and_links() -> Vec<u8> {
+    let mut p = defaults::new_presentation(None);
+    let layout = defaults::layout_of_kind(&p, LayoutType::Blank).unwrap_or_default();
+    for _ in 0..2 {
+        let s = defaults::new_slide(&mut p, layout);
+        p.slides.push(Arc::new(s));
+    }
+    p.slides.truncate(2);
+    let base = deckcraft_pptx::export(&p).expect("export");
+    let rels = part(&base, "ppt/slides/_rels/slide1.xml.rels");
+    let rels = rels.replace(
+        "</Relationships>",
+        r#"<Relationship Id="rId90" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink" Target="https://example.com/report?q=1&amp;r=2" TargetMode="External"/><Relationship Id="rId91" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide" Target="slide2.xml"/><Relationship Id="rId92" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink" Target="mailto:team@example.com?subject=Deck" TargetMode="External"/></Relationships>"#,
+    );
+    let shadow = sp(
+        10,
+        "Shadowed",
+        r#"<a:hlinkClick r:id="" action="ppaction://hlinkshowjump?jump=endshow" highlightClick="1"/><a:hlinkHover r:id="rId90" tooltip="Hover for the report"/>"#,
+        254000,
+        r#"<a:outerShdw blurRad="76200" dist="38100" dir="2700000" sx="102000" sy="102000" algn="tl" rotWithShape="0"><a:prstClr val="black"><a:alpha val="40000"/></a:prstClr></a:outerShdw>"#,
+        r#"<a:p><a:r><a:rPr lang="en-US" dirty="0"/><a:t>Shadow</a:t></a:r></a:p>"#,
+    );
+    let glow = sp(
+        11,
+        "Glowing",
+        "",
+        3048000,
+        r#"<a:glow rad="139700"><a:schemeClr val="accent2"><a:satMod val="175000"/><a:alpha val="40000"/></a:schemeClr></a:glow>"#,
+        r#"<a:p><a:r><a:rPr lang="en-US"><a:hlinkClick r:id="rId90" tooltip="Open the report"/></a:rPr><a:t>Report</a:t></a:r><a:r><a:rPr lang="en-US"/><a:t> and </a:t></a:r><a:r><a:rPr lang="en-US"><a:hlinkClick r:id="rId91" action="ppaction://hlinksldjump"/></a:rPr><a:t>appendix</a:t></a:r></a:p>"#,
+    );
+    let soft = sp(
+        12,
+        "Soft edged",
+        "",
+        5842000,
+        r#"<a:softEdge rad="63500"/>"#,
+        r#"<a:p><a:r><a:rPr lang="en-US"><a:hlinkClick r:id="" action="ppaction://hlinkshowjump?jump=nextslide"/></a:rPr><a:t>Next</a:t></a:r><a:r><a:rPr lang="en-US"><a:hlinkClick r:id="rId92"/></a:rPr><a:t> mail us</a:t></a:r></a:p>"#,
+    );
+    let refl = sp(
+        13,
+        "Reflected",
+        "",
+        8636000,
+        r#"<a:reflection blurRad="6350" stA="50000" endA="300" endPos="55500" dist="50800" dir="5400000" sy="-100000" algn="bl" rotWithShape="0"/>"#,
+        r#"<a:p><a:r><a:rPr lang="en-US"><a:hlinkMouseOver r:id="rId90" tooltip="Preview"/></a:rPr><a:t>Hover me</a:t></a:r></a:p>"#,
+    );
+    let slide = format!(
+        r#"<?xml version="1.0" encoding="UTF-8" standalone="yes"?><p:sld {NS}><p:cSld><p:spTree><p:nvGrpSpPr><p:cNvPr id="1" name=""/><p:cNvGrpSpPr/><p:nvPr/></p:nvGrpSpPr><p:grpSpPr><a:xfrm><a:off x="0" y="0"/><a:ext cx="0" cy="0"/><a:chOff x="0" y="0"/><a:chExt cx="0" cy="0"/></a:xfrm></p:grpSpPr>{shadow}{glow}{soft}{refl}</p:spTree></p:cSld><p:clrMapOvr><a:masterClrMapping/></p:clrMapOvr></p:sld>"#
+    );
+    repack(&base, &[("ppt/slides/slide1.xml", slide), ("ppt/slides/_rels/slide1.xml.rels", rels)])
+}
+
+fn fx(s: &Shape) -> Effects {
+    s.effects.clone().unwrap_or_default()
+}
+
+fn run_links(s: &Shape) -> Vec<(String, Option<Hyperlink>)> {
+    s.text.iter().flat_map(|t| t.paragraphs.iter()).flat_map(|p| p.runs.iter()).map(|r| (r.text.clone(), r.props.link.clone())).collect()
+}
+
+#[test]
+fn effects_and_links_survive_a_round_trip() {
+    let bytes = effects_and_links();
+    let a = deckcraft_pptx::import(&bytes).expect("import");
+    let get = shapes_named(&a, 0);
+    // Read as PowerPoint wrote them.
+    let sh = fx(get("Shadowed")).outer_shadow.expect("shadow");
+    assert!((sh.blur - 6.0).abs() < 1e-6 && (sh.dist - 3.0).abs() < 1e-6 && (sh.dir - 45.0).abs() < 1e-6, "{sh:?}");
+    assert_eq!((sh.align.as_str(), sh.rotate_with_shape), ("tl", false));
+    assert!((sh.sx - 1.02).abs() < 1e-6);
+    assert!(fx(get("Glowing")).glow.is_some_and(|g| (g.radius - 11.0).abs() < 1e-6));
+    assert_eq!(fx(get("Soft edged")).soft_edge, Some(5.0));
+    let r = fx(get("Reflected")).reflection.expect("reflection");
+    assert!((r.end_pos - 0.555).abs() < 1e-6 && (r.dist - 4.0).abs() < 1e-6, "{r:?}");
+    let shape = get("Shadowed");
+    assert!(matches!(shape.click.as_ref().map(|h| (&h.action, h.highlight_click)), Some((Action::EndShow, true))));
+    assert!(
+        matches!(shape.hover.as_ref().map(|h| (&h.action, h.tooltip.as_str())), Some((Action::Url { url }, "Hover for the report")) if url.contains("q=1&r=2"))
+    );
+    let links = run_links(get("Glowing"));
+    assert!(matches!(&links[0].1, Some(Hyperlink { action: Action::Url { .. }, tooltip, .. }) if tooltip == "Open the report"));
+    assert!(links[1].1.is_none());
+    assert!(matches!(&links[2].1, Some(Hyperlink { action: Action::Slide { slide }, .. }) if *slide == a.slides[1].id));
+    let links = run_links(get("Soft edged"));
+    assert!(matches!(&links[0].1, Some(Hyperlink { action: Action::NextSlide, .. })));
+    assert!(matches!(&links[1].1, Some(Hyperlink { action: Action::Url { url }, .. }) if url.starts_with("mailto:")));
+    let hover = get("Reflected").text.as_ref().and_then(|t| t.paragraphs[0].runs[0].props.hover.clone());
+    assert!(matches!(hover, Some(Hyperlink { action: Action::Url { .. }, ref tooltip, .. }) if tooltip == "Preview"), "{hover:?}");
+
+    // Saved and reopened: the same effects and links.
+    let b = round_trip(&a);
+    let (ga, gb) = (shapes_named(&a, 0), shapes_named(&b, 0));
+    for n in ["Shadowed", "Glowing", "Soft edged", "Reflected"] {
+        assert_eq!(fx(ga(n)), fx(gb(n)), "effects of {n}");
+        assert_eq!(ga(n).click, gb(n).click, "click of {n}");
+        assert_eq!(ga(n).hover, gb(n).hover, "hover of {n}");
+        let la: Vec<_> = run_links(ga(n))
+            .into_iter()
+            .map(|(t, l)| (t, l.map(|h| (format!("{:?}", h.action).replace(&format!("{:?}", a.slides[1].id), "S2"), h.tooltip))))
+            .collect();
+        let lb: Vec<_> = run_links(gb(n))
+            .into_iter()
+            .map(|(t, l)| (t, l.map(|h| (format!("{:?}", h.action).replace(&format!("{:?}", b.slides[1].id), "S2"), h.tooltip))))
+            .collect();
+        assert_eq!(la, lb, "text links of {n}");
+        let ha: Vec<_> = ga(n).text.iter().flat_map(|t| &t.paragraphs).flat_map(|p| &p.runs).map(|r| r.props.hover.clone()).collect();
+        let hb: Vec<_> = gb(n).text.iter().flat_map(|t| &t.paragraphs).flat_map(|p| &p.runs).map(|r| r.props.hover.clone()).collect();
+        assert_eq!(ha, hb, "text hover of {n}");
+    }
+    let out = deckcraft_pptx::export(&b).expect("export");
+    assert!(part(&out, "ppt/slides/slide1.xml").contains("hlinkMouseOver"));
+}
+
+/// Two masters with their own themes (colours, fonts) and layouts, slides on each.
+fn two_masters() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    let mut second = (*p.masters[0]).clone();
+    second.id = deckcraft_model::MasterId(p.alloc_id());
+    second.name = "Brand Dark".into();
+    second.theme.name = "Brand Dark Theme".into();
+    second.theme.colors.name = "Brand Colours".into();
+    second.theme.colors.colors[4] = deckcraft_model::Rgba::rgb(0x12, 0x34, 0x56);
+    second.theme.colors.colors[2] = deckcraft_model::Rgba::rgb(0x20, 0x20, 0x30);
+    second.theme.fonts.name = "Brand Fonts".into();
+    second.theme.fonts.major.latin = "Georgia".into();
+    second.theme.fonts.minor.latin = "Verdana".into();
+    second.background = Some(deckcraft_model::Background::Fill {
+        fill: deckcraft_model::Fill::solid(deckcraft_model::ColorRef::rgb(deckcraft_model::Rgba::rgb(0x10, 0x10, 0x18))),
+    });
+    for l in &mut second.layouts {
+        l.id = deckcraft_model::LayoutId(p.alloc_id());
+        l.name = format!("Dark {}", l.name);
+    }
+    second.layouts.truncate(4);
+    let dark_layout = second.layouts[1].id;
+    p.masters.push(Arc::new(second));
+    let light_layout = p.masters[0].layouts[0].id;
+    let s1 = defaults::new_slide(&mut p, light_layout);
+    let s2 = defaults::new_slide(&mut p, dark_layout);
+    p.slides = vec![Arc::new(s1), Arc::new(s2)];
+    p
+}
+
+#[test]
+fn themes_masters_and_layouts_survive_a_round_trip() {
+    let a = two_masters();
+    let b = round_trip(&a);
+    assert_eq!(b.masters.len(), 2);
+    for (ma, mb) in a.masters.iter().zip(&b.masters) {
+        assert_eq!(ma.name, mb.name);
+        assert_eq!(ma.theme.name, mb.theme.name);
+        // The writer adds PowerPoint's empty objectDefaults/extraClrSchemeLst, kept as raw XML.
+        let bare = |t: &deckcraft_model::theme::Theme| deckcraft_model::theme::Theme { raw_extra: None, ..t.clone() };
+        assert_eq!(bare(&ma.theme), bare(&mb.theme), "whole theme of {}", ma.name);
+        assert_eq!(ma.theme.colors, mb.theme.colors, "colour scheme of {}", ma.name);
+        assert_eq!(ma.theme.fonts.name, mb.theme.fonts.name);
+        assert_eq!(ma.theme.fonts.major.latin, mb.theme.fonts.major.latin);
+        assert_eq!(ma.theme.fonts.minor.latin, mb.theme.fonts.minor.latin);
+        assert_eq!(ma.background, mb.background, "background of {}", ma.name);
+        let names = |m: &deckcraft_model::Master| m.layouts.iter().map(|l| l.name.clone()).collect::<Vec<_>>();
+        assert_eq!(names(ma), names(mb));
+    }
+    // Each slide stays on its master's layout.
+    let layout_name =
+        |p: &Presentation, i: usize| p.masters.iter().flat_map(|m| m.layouts.iter()).find(|l| l.id == p.slides[i].layout).map(|l| l.name.clone());
+    for i in 0..2 {
+        assert_eq!(layout_name(&a, i), layout_name(&b, i), "slide {i}");
+    }
+    // A second save keeps the same theme and master parts.
+    let names = |bytes: &[u8]| {
+        let z = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+        let mut v: Vec<String> =
+            z.file_names().filter(|n| n.contains("theme") || n.contains("slideMaster") || n.contains("slideLayout")).map(str::to_string).collect();
+        v.sort();
+        v
+    };
+    let c = round_trip(&b);
+    for (mb, mc) in b.masters.iter().zip(&c.masters) {
+        assert_eq!(mb.theme, mc.theme, "stable after a second save");
+        // An empty map is the default one, which the writer spells out.
+        assert_eq!(mb.color_map, mc.color_map);
+    }
+    let once = deckcraft_pptx::export(&b).expect("export");
+    let twice = deckcraft_pptx::export(&deckcraft_pptx::import(&once).expect("import")).expect("export");
+    assert_eq!(names(&once), names(&twice));
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..ad52986d 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -61,7 +61,9 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### PPTX has never met a corpus of real decks
 - **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests) uses decks DeckCraft generates;
   the 2026-10-07 alpha checklist already listed this as open. No reference renders from PowerPoint
-  exist to compare against.
+  exist to compare against. `crates/pptx/tests/corpus_themes.rs` starts on PowerPoint-shaped XML:
+  themes and two masters with their layouts, shadow/glow/soft-edge/reflection effects, and text
+  and shape hyperlinks and actions (text Mouse Over actions were dropped; now kept).
 - **Impact:** the main reason to switch is "open my PowerPoint decks". Fidelity on real decks
   (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is unknown.
 - **Estimate:** 20–35 h: build an owned corpus in `storytold/photocraft-corpus` style (craftrules
@@ -256,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Corpus slice: themes, masters, effects and links; text Mouse Over actions round-trip |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |

From 8fd04ebd92c05901f5d6e09491480659ea4f14dd Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 00:58:20 +0300
Subject: [PATCH 209/376] PPTX: round-trip chart trendlines
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

An owned corpus slice checks combo charts with data labels, merged
tables with diagonal borders, and text columns, autofit, vertical text
and a WordArt warp. Trendlines (type, order, period, forecast,
intercept, equation and R²) are now read and written.
---
 ROADMAP.md                         |   4 +-
 crates/model/src/chart.rs          |  84 +++++++++++++
 crates/pptx/src/read/chart.rs      |  53 +++++++-
 crates/pptx/src/write/chart.rs     |  53 +++++++-
 crates/pptx/tests/corpus_charts.rs | 187 +++++++++++++++++++++++++++++
 docs/file-format-parity.md         |   7 +-
 docs/gaps.md                       |  13 +-
 docs/roadmap.md                    |   3 +-
 8 files changed, 393 insertions(+), 11 deletions(-)
 create mode 100644 crates/pptx/tests/corpus_charts.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..eb16cb98 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: chart trendlines round-trip; previous: minor, hours to ~95% per audience added; ready ~55%; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Chart trendlines round-trip (type, polynomial order, moving-average period, forecast, intercept, equation and R²). An owned corpus slice also checks combo charts with data labels, merged tables with diagonal borders, and text columns, autofit, vertical text and a WordArt warp |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: chart trendlines |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index aebee497..9e4e4a3e 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -116,6 +116,87 @@ impl ChartType {
     }
 }
 
+/// `c:trendlineType`: the six trendlines DrawingML charts store.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum TrendlineType {
+    Exp,
+    #[default]
+    Linear,
+    Log,
+    MovingAvg,
+    Poly,
+    Power,
+}
+
+impl TrendlineType {
+    pub fn xml(self) -> &'static str {
+        match self {
+            TrendlineType::Exp => "exp",
+            TrendlineType::Linear => "linear",
+            TrendlineType::Log => "log",
+            TrendlineType::MovingAvg => "movingAvg",
+            TrendlineType::Poly => "poly",
+            TrendlineType::Power => "power",
+        }
+    }
+    pub fn from_xml(s: &str) -> Option<Self> {
+        Some(match s {
+            "exp" => TrendlineType::Exp,
+            "linear" => TrendlineType::Linear,
+            "log" => TrendlineType::Log,
+            "movingAvg" => TrendlineType::MovingAvg,
+            "poly" => TrendlineType::Poly,
+            "power" => TrendlineType::Power,
+            _ => return None,
+        })
+    }
+}
+
+/// One `c:trendline` on a series. Polynomials use `order` (2–6); moving averages use `period`.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+#[serde(default, rename_all = "camelCase")]
+pub struct Trendline {
+    pub kind: TrendlineType,
+    /// `c:name`, when the file sets one.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub name: Option<String>,
+    /// Polynomial order (`c:order`).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub order: Option<u32>,
+    /// Moving-average period (`c:period`).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub period: Option<u32>,
+    /// Forecast forward and backward, in category units (`c:forward`, `c:backward`).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub forward: Option<f64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub backward: Option<f64>,
+    /// Cross the value axis at this value (`c:intercept`).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub intercept: Option<f64>,
+    /// Show the equation (`c:dispEq`).
+    pub disp_eq: bool,
+    /// Show R² (`c:dispRSqr`).
+    pub disp_r_sqr: bool,
+}
+
+impl Default for Trendline {
+    fn default() -> Self {
+        Trendline {
+            kind: TrendlineType::Linear,
+            name: None,
+            order: None,
+            period: None,
+            forward: None,
+            backward: None,
+            intercept: None,
+            disp_eq: false,
+            disp_r_sqr: false,
+        }
+    }
+}
+
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "camelCase")]
 pub struct Series {
@@ -138,6 +219,9 @@ pub struct Series {
     /// source data's.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub number_format: Option<String>,
+    /// Trendlines (`c:trendline`), in file order.
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub trendlines: Vec<Trendline>,
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 6d7541ff..b8733490 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -1,6 +1,6 @@
 //! Chart parts (`c:chartSpace`) → [`Chart`]. The original XML is kept in `Chart.raw`.
 
-use deckcraft_model::chart::{Chart, ChartType, Series};
+use deckcraft_model::chart::{Chart, ChartType, Series, Trendline, TrendlineType};
 use deckcraft_model::style::Fill;
 
 use crate::xml::El;
@@ -202,6 +202,11 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
             if let Some(d) = s.child("dLbls").and_then(|d| d.child("showVal")).and_then(|v| v.bool("val")) {
                 ser.data_labels = Some(d);
             }
+            for t in s.children_named("trendline").take(16) {
+                if let Some(t) = trendline(t) {
+                    ser.trendlines.push(t);
+                }
+            }
             // Data labels' number format: the series' labels', the group's, else the source data's.
             let label_fmt = |d: Option<&El>| {
                 d.and_then(|d| d.child("numFmt"))
@@ -285,6 +290,33 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
     Some(c)
 }
 
+fn trend_num(e: &El, k: &str) -> Option<f64> {
+    e.child_val(k).and_then(|v| v.parse::<f64>().ok()).filter(|v| v.is_finite() && v.abs() <= 1.0e12)
+}
+
+fn trend_name(s: &str) -> Option<String> {
+    let cleaned: String =
+        s.chars().filter(|c| matches!(c, '\t' | '\n' | '\r') || (*c >= ' ' && *c != '\u{FFFE}' && *c != '\u{FFFF}')).take(255).collect();
+    let cleaned = cleaned.trim();
+    if cleaned.is_empty() { None } else { Some(cleaned.to_string()) }
+}
+
+/// One `c:trendline`. Unknown types are skipped.
+fn trendline(e: &El) -> Option<Trendline> {
+    let kind = TrendlineType::from_xml(e.child_val("trendlineType")?)?;
+    Some(Trendline {
+        kind,
+        name: e.child("name").map(|n| n.text()).as_deref().and_then(trend_name),
+        order: if kind == TrendlineType::Poly { e.child("order").and_then(|o| o.u32("val")).map(|v| v.clamp(2, 6)) } else { None },
+        period: if kind == TrendlineType::MovingAvg { e.child("period").and_then(|o| o.u32("val")).map(|v| v.clamp(2, 255)) } else { None },
+        forward: trend_num(e, "forward"),
+        backward: trend_num(e, "backward"),
+        intercept: trend_num(e, "intercept"),
+        disp_eq: e.child("dispEq").and_then(|d| d.bool("val")).unwrap_or(false),
+        disp_r_sqr: e.child("dispRSqr").and_then(|d| d.bool("val")).unwrap_or(false),
+    })
+}
+
 /// The size in points of the first `a:defRPr` or `a:rPr` with one under `e` (`sz` in hundredths).
 fn text_size(e: Option<&El>) -> Option<f64> {
     fn rec(e: &El, depth: usize) -> Option<f64> {
@@ -388,4 +420,23 @@ mod tests {
         );
         assert_eq!(read_chart_xml(xml.as_bytes()).unwrap().text_size, None, "no sizes: the renderer picks one");
     }
+
+    #[test]
+    fn trendlines_are_read() {
+        let xml = br#"<c:chartSpace xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart"><c:chart><c:plotArea><c:lineChart><c:grouping val="standard"/><c:ser><c:idx val="0"/><c:tx><c:v>Spend</c:v></c:tx>
+<c:trendline><c:name>Fit &amp; forecast</c:name><c:trendlineType val="linear"/><c:forward val="1"/><c:backward val="0.5"/><c:intercept val="0"/><c:dispRSqr val="1"/><c:dispEq val="1"/></c:trendline>
+<c:trendline><c:trendlineType val="poly"/><c:order val="9"/></c:trendline>
+<c:trendline><c:trendlineType val="movingAvg"/><c:period val="3"/></c:trendline>
+<c:trendline><c:trendlineType val="notAType"/></c:trendline>
+<c:val><c:numLit><c:ptCount val="1"/><c:pt idx="0"><c:v>1</c:v></c:pt></c:numLit></c:val></c:ser></c:lineChart></c:plotArea></c:chart></c:chartSpace>"#;
+        let c = read_chart_xml(xml).unwrap();
+        let t = &c.series[0].trendlines;
+        assert_eq!(t.len(), 3);
+        assert_eq!(t[0].name.as_deref(), Some("Fit & forecast"));
+        assert_eq!(t[0].kind, TrendlineType::Linear);
+        assert_eq!((t[0].forward, t[0].backward, t[0].intercept), (Some(1.0), Some(0.5), Some(0.0)));
+        assert!(t[0].disp_eq && t[0].disp_r_sqr);
+        assert_eq!((t[1].kind, t[1].order), (TrendlineType::Poly, Some(6)));
+        assert_eq!((t[2].kind, t[2].period), (TrendlineType::MovingAvg, Some(3)));
+    }
 }
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 76567c9e..0d8cacbb 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -1,6 +1,6 @@
 //! Chart parts: a `c:chartSpace` with cached categories and values (no embedded workbook).
 
-use deckcraft_model::chart::{Chart, ChartType, Series};
+use deckcraft_model::chart::{Chart, ChartType, Series, Trendline, TrendlineType};
 use deckcraft_model::style::Fill;
 
 use crate::opc::{NS_A, NS_C, NS_R};
@@ -174,6 +174,12 @@ fn series(w: &mut W, c: &Chart, s: &Series, i: usize, kind: ChartType, g: Group)
     if let Some(d) = s.data_labels {
         data_labels(w, d);
     }
+    // After labels, before the category and value caches (ECMA-376 series content order).
+    if matches!(g, Group::Bar | Group::Line | Group::Area | Group::Scatter) {
+        for t in s.trendlines.iter().take(16) {
+            trendline(w, t);
+        }
+    }
     let n = c.categories.len().max(s.values.len());
     let last = n + 1;
     if matches!(g, Group::Scatter | Group::Bubble) {
@@ -207,6 +213,51 @@ fn series(w: &mut W, c: &Chart, s: &Series, i: usize, kind: ChartType, g: Group)
     w.close("c:ser");
 }
 
+fn trend_num(v: Option<f64>) -> Option<f64> {
+    v.filter(|v| v.is_finite() && v.abs() <= 1.0e12)
+}
+
+fn trend_name(s: &str) -> Option<String> {
+    let cleaned: String =
+        s.chars().filter(|c| matches!(c, '\t' | '\n' | '\r') || (*c >= ' ' && *c != '\u{FFFE}' && *c != '\u{FFFF}')).take(255).collect();
+    let cleaned = cleaned.trim();
+    if cleaned.is_empty() { None } else { Some(cleaned.to_string()) }
+}
+
+fn trendline(w: &mut W, t: &Trendline) {
+    w.open0("c:trendline");
+    if let Some(name) = t.name.as_deref().and_then(trend_name) {
+        w.elt("c:name", &name);
+    }
+    w.val("c:trendlineType", t.kind.xml());
+    if t.kind == TrendlineType::Poly
+        && let Some(o) = t.order
+    {
+        w.val("c:order", o.clamp(2, 6));
+    }
+    if t.kind == TrendlineType::MovingAvg
+        && let Some(p) = t.period
+    {
+        w.val("c:period", p.clamp(2, 255));
+    }
+    if let Some(v) = trend_num(t.forward) {
+        w.val("c:forward", fmt_num(v));
+    }
+    if let Some(v) = trend_num(t.backward) {
+        w.val("c:backward", fmt_num(v));
+    }
+    if let Some(v) = trend_num(t.intercept) {
+        w.val("c:intercept", fmt_num(v));
+    }
+    if t.disp_r_sqr {
+        w.val("c:dispRSqr", 1);
+    }
+    if t.disp_eq {
+        w.val("c:dispEq", 1);
+    }
+    w.close("c:trendline");
+}
+
 fn data_labels(w: &mut W, show: bool) {
     w.open0("c:dLbls");
     for (n, v) in [
diff --git a/crates/pptx/tests/corpus_charts.rs b/crates/pptx/tests/corpus_charts.rs
new file mode 100644
index 00000000..210a4838
--- /dev/null
+++ b/crates/pptx/tests/corpus_charts.rs
@@ -0,0 +1,187 @@
+//! Owned corpus slice: combo charts (labels and trendlines), merged tables with diagonal
+//! borders, and text columns, autofit, vertical text and a WordArt warp.
+//!
+//! A combo series can sit on the secondary value axis (`secondary_axis`, `y2_*`). That axis is
+//! read from files; rebuilding a chart does not write it yet, so this test does not require it
+//! to survive.
+
+use std::sync::Arc;
+
+use deckcraft_color::Rgba;
+use deckcraft_geom::Xfrm;
+use deckcraft_model::chart::{Chart, ChartType, Series, Trendline, TrendlineType};
+use deckcraft_model::style::{ColorRef, Line};
+use deckcraft_model::table::Table;
+use deckcraft_model::text::{AutoFit, TextBody, TextDir};
+use deckcraft_model::{Presentation, Shape, ShapeId, ShapeKind, Slide, defaults};
+
+fn shape(p: &mut Presentation, name: &str, x: f64, y: f64, w: f64, h: f64) -> Shape {
+    Shape { id: ShapeId(p.alloc_id()), name: name.into(), xfrm: Some(Xfrm::new(x, y, w, h)), ..Default::default() }
+}
+
+fn round(p: &Presentation) -> Presentation {
+    let bytes = deckcraft_pptx::export(p).expect("export");
+    deckcraft_pptx::import(&bytes).expect("import")
+}
+
+fn by_name<'a>(s: &'a Slide, name: &str) -> &'a Shape {
+    s.shapes.iter().find(|x| x.name == name).unwrap_or_else(|| panic!("no shape {name}"))
+}
+
+fn plain(t: &TextBody) -> String {
+    t.paragraphs.iter().map(|p| p.runs.iter().map(|r| r.text.as_str()).collect::<String>()).collect::<Vec<_>>().join("\n")
+}
+
+fn trend(kind: TrendlineType) -> Trendline {
+    Trendline { kind, ..Default::default() }
+}
+
+fn corpus() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    p.props.title = "Chart and table corpus".into();
+    let mut s = {
+        let layout = defaults::layout_of_kind(&p, deckcraft_model::LayoutType::Blank).unwrap_or_default();
+        defaults::new_slide(&mut p, layout)
+    };
+
+    let chart = Chart {
+        kind: ChartType::Combo,
+        title: Some("Spend and clicks".into()),
+        categories: vec!["W1".into(), "W2".into(), "W3".into(), "W4".into()],
+        data_labels: true,
+        y2_max: Some(8000.0),
+        y2_format: Some("0.0".into()),
+        series: vec![
+            Series {
+                name: "Spend".into(),
+                values: vec![Some(200.0), Some(310.0), Some(280.0), Some(360.0)],
+                kind: Some(ChartType::Column),
+                trendlines: vec![
+                    Trendline { kind: TrendlineType::Poly, name: Some("Cubic".into()), order: Some(3), ..Default::default() },
+                    trend(TrendlineType::Exp),
+                ],
+                ..Default::default()
+            },
+            Series {
+                name: "Clicks".into(),
+                values: vec![Some(6000.0), Some(7400.0), Some(7100.0), Some(7900.0)],
+                kind: Some(ChartType::LineMarkers),
+                secondary_axis: true,
+                data_labels: Some(false),
+                trendlines: vec![
+                    Trendline {
+                        kind: TrendlineType::Linear,
+                        name: Some("Fit & forecast".into()),
+                        forward: Some(1.0),
+                        backward: Some(0.5),
+                        intercept: Some(0.0),
+                        disp_eq: true,
+                        disp_r_sqr: true,
+                        ..Default::default()
+                    },
+                    trend(TrendlineType::Log),
+                    trend(TrendlineType::Power),
+                    Trendline { kind: TrendlineType::MovingAvg, period: Some(2), ..Default::default() },
+                ],
+                ..Default::default()
+            },
+        ],
+        ..Default::default()
+    };
+    let mut ch = shape(&mut p, "Combo", 40.0, 40.0, 420.0, 260.0);
+    ch.kind = ShapeKind::Chart(Box::new(chart));
+    s.shapes.push(ch);
+
+    let mut table = Table::new(3, 3, 360.0, 28.0);
+    if let Some(cell) = table.cell_mut(0, 0) {
+        cell.text = TextBody::from_text("Merged");
+    }
+    assert!(table.merge(0, 0, 1, 1));
+    if let Some(cell) = table.cell_mut(0, 2) {
+        cell.text = TextBody::from_text("Diag");
+        cell.diag_down = Some(Line::solid(ColorRef::rgb(Rgba::rgb(180, 40, 40)), 1.5));
+        cell.diag_up = Some(Line::solid(ColorRef::rgb(Rgba::rgb(20, 90, 160)), 2.0));
+    }
+    let mut ts = shape(&mut p, "Merged table", 40.0, 320.0, 360.0, 84.0);
+    ts.kind = ShapeKind::Table(table);
+    s.shapes.push(ts);
+
+    let mut columns = TextBody::from_text("Two columns\nof vertical text");
+    columns.body.columns = Some(3);
+    columns.body.col_spacing = Some(18.0);
+    columns.body.autofit = Some(AutoFit::Shrink { font_scale: 0.85, line_reduction: 0.2 });
+    columns.body.vert = Some(TextDir::Vertical270);
+    let mut col = shape(&mut p, "Columns", 480.0, 40.0, 200.0, 160.0);
+    col.text = Some(columns);
+    s.shapes.push(col);
+
+    let mut warp = TextBody::from_text("Arch");
+    warp.body.warp = Some("textArchUp".into());
+    warp.body.warp_adj = vec![5_000_000.0];
+    warp.body.autofit = Some(AutoFit::Shape);
+    let mut word = shape(&mut p, "Warp", 480.0, 220.0, 200.0, 80.0);
+    word.text = Some(warp);
+    s.shapes.push(word);
+
+    p.slides.push(Arc::new(s));
+    p
+}
+
+fn chart_of(s: &Slide) -> &Chart {
+    let ShapeKind::Chart(c) = &by_name(s, "Combo").kind else { panic!("not a chart") };
+    c
+}
+
+#[test]
+fn chart_table_and_text_corpus_round_trips() {
+    let p = corpus();
+    let q = round(&p);
+    let slide = &q.slides[1];
+    let src = chart_of(&p.slides[1]);
+    let got = chart_of(slide);
+    assert_eq!(got.kind, ChartType::Combo);
+    assert_eq!(got.title.as_deref(), Some("Spend and clicks"));
+    assert_eq!(got.categories, src.categories);
+    assert!(got.data_labels);
+    assert_eq!(got.series.len(), 2);
+    for (a, b) in src.series.iter().zip(got.series.iter()) {
+        assert_eq!(a.name, b.name);
+        assert_eq!(a.values, b.values);
+        assert_eq!(a.kind, b.kind);
+        assert_eq!(a.data_labels, b.data_labels);
+        assert_eq!(a.trendlines, b.trendlines);
+    }
+
+    let twice = round(&q);
+    let again = chart_of(&twice.slides[1]);
+    for (a, b) in got.series.iter().zip(again.series.iter()) {
+        assert_eq!(a.trendlines, b.trendlines);
+        assert_eq!(a.data_labels, b.data_labels);
+    }
+
+    let ShapeKind::Table(t) = &by_name(slide, "Merged table").kind else { panic!("not a table") };
+    let anchor = t.cell(0, 0).expect("anchor");
+    assert_eq!((anchor.grid_span, anchor.row_span), (2, 2));
+    assert!(!anchor.h_merge && !anchor.v_merge);
+    assert_eq!(plain(&anchor.text), "Merged");
+    assert!(t.cell(0, 1).is_some_and(|c| c.h_merge && !c.v_merge));
+    assert!(t.cell(1, 0).is_some_and(|c| !c.h_merge && c.v_merge));
+    assert!(t.cell(1, 1).is_some_and(|c| c.h_merge && c.v_merge));
+    let diag = t.cell(0, 2).expect("diag");
+    assert_eq!(diag.diag_down, Some(Line::solid(ColorRef::rgb(Rgba::rgb(180, 40, 40)), 1.5)));
+    assert_eq!(diag.diag_up, Some(Line::solid(ColorRef::rgb(Rgba::rgb(20, 90, 160)), 2.0)));
+    assert_eq!(plain(&diag.text), "Diag");
+
+    let cols = by_name(slide, "Columns").text.as_ref().expect("columns");
+    assert_eq!(plain(cols), "Two columns\nof vertical text");
+    assert_eq!(cols.body.columns, Some(3));
+    assert_eq!(cols.body.col_spacing, Some(18.0));
+    assert_eq!(cols.body.autofit, Some(AutoFit::Shrink { font_scale: 0.85, line_reduction: 0.2 }));
+    assert_eq!(cols.body.vert, Some(TextDir::Vertical270));
+
+    let warp = by_name(slide, "Warp").text.as_ref().expect("warp");
+    assert_eq!(plain(warp), "Arch");
+    assert_eq!(warp.body.warp.as_deref(), Some("textArchUp"));
+    assert_eq!(warp.body.warp_adj, vec![5_000_000.0]);
+    assert_eq!(warp.body.autofit, Some(AutoFit::Shape));
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..d8c0667e 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines round-trip; previously trivial: groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -71,8 +71,8 @@ the round trip even though DeckCraft doesn't model it.
 | Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow` and date fields |
 | Text warp (`prstTxWarp`) | yes | yes | All 40 presets rendered (`crates/geom/src/warp.rs`); adjust values (`avLst`) round-trip |
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
-| Tables with styles | yes | yes | |
-| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
+| Tables with styles | yes | yes | Merges and both diagonal borders round-trip |
+| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. Trendlines (type, order or period, forecast, intercept, equation and R²) are read and written; they are not drawn. A combo chart's secondary value axis is read and is not written back when the chart is rebuilt |
 | Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Chart trendlines round-trip (`corpus_charts.rs`); merges, diagonal borders, columns, autofit, vertical text and WordArt warp are in that slice |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..20327e5a 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines round-trip; previous: minor, 3-D bevel, camera and face lighting rendered; IME composition and CJK interface text landed, #101; core-workflow alpha gate added; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -59,9 +59,11 @@ revision history.
 Detail in [file-format-parity.md](file-format-parity.md).
 
 ### PPTX has never met a corpus of real decks
-- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests) uses decks DeckCraft generates;
+- **Evidence:** every PPTX test (`crates/pptx/tests`) uses decks DeckCraft generates;
   the 2026-10-07 alpha checklist already listed this as open. No reference renders from PowerPoint
-  exist to compare against.
+  exist to compare against. `corpus_charts.rs` round-trips one owned slice (a combo chart with
+  data labels and trendlines, a merged table with diagonal borders, text columns, autofit,
+  vertical text and a WordArt warp). That is still a generated deck, not a corpus of real ones.
 - **Impact:** the main reason to switch is "open my PowerPoint decks". Fidelity on real decks
   (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is unknown.
 - **Estimate:** 20–35 h: build an owned corpus in `storytold/photocraft-corpus` style (craftrules
@@ -146,7 +148,9 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
-  whisker) aren't read.
+  whisker) aren't read. Trendlines round-trip (`corpus_charts.rs`) and are not drawn. A combo
+  chart's secondary value axis is read (`y2_*`, `Series.secondary_axis`) and is not written back
+  when the chart is rebuilt.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 
@@ -256,6 +260,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Chart trendlines round-trip. The real-deck corpus gap stays open; secondary-axis export and drawing trendlines stay in the charts gap |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..0321e67b 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (chart trendlines round-trip; the real-deck corpus stays open; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Chart trendlines round-trip in an owned corpus slice; the real-deck corpus (item 2) stays open |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |

From 15daed6ca4b0d0c4de2329c3b509951112141cc9 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:08:13 +0300
Subject: [PATCH 210/376] Charts: histograms, Pareto and box and whisker;
 Office 2016 charts save as themselves

Histograms and Paretos bin their observations (bin count, bin width or
Scott's rule) and draw as touching columns, a Pareto with its cumulative
line on a percentage axis. Box and whisker charts draw exclusive-quartile
boxes, 1.5 IQR whiskers, means and outliers per category group.

Edited and new Office 2016 charts are written as chartEx parts from the
model (with the plain-chart fallback), so a waterfall stays a waterfall.
The chart menus list all seven types, and chart.options sets bins and
waterfall totals.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/insert.rs |  40 ++++-
 crates/model/src/chart.rs       | 305 ++++++++++++++++++++++++++++++++
 crates/pptx/src/read/chartex.rs |   4 +
 crates/pptx/src/write/chart.rs  | 151 +++++++++++++++-
 crates/pptx/tests/roundtrip.rs  |  58 +++++-
 crates/render/src/chart.rs      |  17 ++
 crates/render/src/chartex.rs    | 103 ++++++++++-
 crates/render/src/tests.rs      |  31 ++++
 crates/ui-egui/src/ribbon.rs    |  25 ++-
 docs/file-format-parity.md      |   2 +-
 docs/gaps.md                    |  10 +-
 11 files changed, 728 insertions(+), 18 deletions(-)

diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..810a96e2 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -73,7 +73,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Chart Elements",
             ["Chart Design", "Chart Layouts"],
             None,
-            "{title?: string|null, legend?: b|t|l|r|null, dataLabels?: bool, gridlines?: bool, palette?, id?}",
+            "{title?: string|null, legend?: b|t|l|r|null, dataLabels?: bool, gridlines?: bool, palette?, binCount?: n|null, binSize?: n|null, subtotals?: [point index], id?}",
             has_selection,
             chart_options
         ),
@@ -644,7 +644,12 @@ fn chart_type_cmd(s: &mut Session, p: &Value) -> Result<Value> {
     let k = chart_type(str_param(p, "type").unwrap_or("column"));
     with_chart(s, p, "chart.type", |c| {
         c.kind = k;
-        c.vary_colors = matches!(k, ChartType::Pie | ChartType::Doughnut) || c.series.len() == 1 && c.vary_colors;
+        c.vary_colors =
+            matches!(k, ChartType::Pie | ChartType::Doughnut | ChartType::Funnel | ChartType::Treemap | ChartType::Sunburst | ChartType::Waterfall)
+                || c.series.len() == 1 && c.vary_colors;
+        if matches!(k, ChartType::Waterfall | ChartType::Histogram | ChartType::Pareto | ChartType::BoxWhisker) {
+            c.gridlines = true;
+        }
         c.raw = None;
         Ok(())
     })
@@ -688,7 +693,38 @@ fn chart_data(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 fn chart_options(s: &mut Session, p: &Value) -> Result<Value> {
+    // Histogram bins: a count or a width (setting one clears the other; null for automatic).
+    let bin_count = p.get("binCount").map(|v| v.as_u64().map(|n| n.clamp(1, deckcraft_model::chart::MAX_BINS as u64) as u32));
+    let bin_size = p.get("binSize").map(|v| v.as_f64().filter(|w| w.is_finite() && *w > 0.0));
+    if p.get("binSize").is_some_and(|v| !v.is_null()) && bin_size.flatten().is_none() {
+        return Err(bad("chart.options", "binSize must be a positive number"));
+    }
+    // Waterfall total points.
+    let subtotals: Option<Vec<usize>> =
+        p.get("subtotals").and_then(Value::as_array).map(|a| a.iter().filter_map(Value::as_u64).map(|i| i as usize).collect());
     with_chart(s, p, "chart.options", |c| {
+        if let Some(n) = bin_count {
+            c.bin_count = n;
+            if n.is_some() {
+                c.bin_size = None;
+            }
+        }
+        if let Some(w) = bin_size {
+            c.bin_size = w;
+            if w.is_some() {
+                c.bin_count = None;
+            }
+        }
+        if let Some(t) = &subtotals {
+            let n = c.series.first().map_or(0, |s| s.values.len());
+            let mut t: Vec<usize> = t.iter().copied().filter(|i| *i < n).collect();
+            t.sort_unstable();
+            t.dedup();
+            c.subtotals = t;
+        }
+        if bin_count.is_some() || bin_size.is_some() || subtotals.is_some() {
+            c.raw = None;
+        }
         if let Some(t) = p.get("title") {
             c.title = t.as_str().map(String::from);
         }
diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index a6c9fa24..583a447b 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -38,6 +38,22 @@ pub enum ChartType {
 }
 
 impl ChartType {
+    /// The Office 2016 (`chartEx`) types, offered after [`ChartType::MAIN`] in chart menus.
+    pub const OFFICE_2016: [ChartType; 7] = [
+        ChartType::Waterfall,
+        ChartType::Funnel,
+        ChartType::Histogram,
+        ChartType::Pareto,
+        ChartType::BoxWhisker,
+        ChartType::Treemap,
+        ChartType::Sunburst,
+    ];
+
+    /// Whether the type is saved as a `chartEx` part (with a plain chart as the fallback).
+    pub fn is_chartex(self) -> bool {
+        Self::OFFICE_2016.contains(&self)
+    }
+
     pub const MAIN: [ChartType; 12] = [
         ChartType::Column,
         ChartType::Bar,
@@ -190,6 +206,13 @@ pub struct Chart {
     /// the running total, instead of floating.
     #[serde(skip_serializing_if = "Vec::is_empty")]
     pub subtotals: Vec<usize>,
+    /// A histogram's bin count (`cx:binCount`); with neither this nor `bin_size` the bins are
+    /// automatic (Scott's rule, as Excel does).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub bin_count: Option<u32>,
+    /// A histogram's bin width (`cx:binSize`).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub bin_size: Option<f64>,
     /// Original chart XML part kept for round-trip of unmodelled options.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw: Option<String>,
@@ -230,6 +253,8 @@ impl Default for Chart {
             y2_hidden: false,
             lang: None,
             subtotals: vec![],
+            bin_count: None,
+            bin_size: None,
             raw: None,
         }
     }
@@ -241,6 +266,27 @@ impl Chart {
         let cats = ["Q1", "Q2", "Q3", "Q4"];
         let data = [[4.2, 2.6, 2.1], [2.8, 4.1, 2.4], [3.6, 1.9, 3.3], [4.7, 3.0, 5.1]];
         let mut c = Chart { kind, categories: cats.iter().map(|s| s.to_string()).collect(), ..Default::default() };
+        if matches!(kind, ChartType::Histogram | ChartType::Pareto | ChartType::BoxWhisker) {
+            // These plot raw observations: a histogram bins one series, a box chart summarises
+            // each category's points.
+            let obs = [12.0, 15.0, 17.0, 18.0, 21.0, 22.0, 22.0, 24.0, 25.0, 27.0, 28.0, 31.0, 33.0, 36.0, 41.0, 48.0];
+            let n_series = if kind == ChartType::BoxWhisker { 2 } else { 1 };
+            c.categories = if kind == ChartType::BoxWhisker {
+                (0..obs.len()).map(|i| if i % 2 == 0 { "Group A" } else { "Group B" }.to_string()).collect()
+            } else {
+                vec![]
+            };
+            for s in 0..n_series {
+                c.series.push(Series {
+                    name: format!("Series {}", s + 1),
+                    values: obs.iter().map(|v| Some(v + s as f64 * 6.0)).collect(),
+                    ..Default::default()
+                });
+            }
+            c.gridlines = true;
+            c.legend = (kind == ChartType::BoxWhisker).then(|| "b".to_string());
+            return c;
+        }
         let n_series =
             if matches!(kind, ChartType::Pie | ChartType::Doughnut | ChartType::Funnel | ChartType::Waterfall | ChartType::Treemap) { 1 } else { 3 };
         for s in 0..n_series {
@@ -544,3 +590,262 @@ mod tests {
         assert_eq!(Chart::sample(ChartType::Pie).series.len(), 1);
     }
 }
+
+/// One histogram bin: `[lo, hi]` (the first bin is closed on both sides, later ones open on the
+/// left, as Excel bins) and how many observations fall in it.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Bin {
+    pub lo: f64,
+    pub hi: f64,
+    pub count: usize,
+}
+
+/// Bins a histogram has at most (a hostile bin size cannot make millions).
+pub const MAX_BINS: usize = 1000;
+
+/// A box and whisker summary of one group: quartiles by Excel's exclusive method, whiskers at
+/// the furthest points within 1.5 IQR of the box, and the points beyond them.
+#[derive(Clone, Debug, PartialEq)]
+pub struct BoxStats {
+    pub low: f64,
+    pub q1: f64,
+    pub median: f64,
+    pub q3: f64,
+    pub high: f64,
+    pub mean: f64,
+    pub outliers: Vec<f64>,
+}
+
+impl Chart {
+    /// The first series' finite observations.
+    fn observations(&self) -> Vec<f64> {
+        self.series.first().map(|s| s.values.iter().flatten().copied().filter(|v| v.is_finite()).collect()).unwrap_or_default()
+    }
+
+    /// The histogram's bins over the first series: by `bin_size`, else `bin_count`, else
+    /// Scott's rule (3.49·σ·n^(-1/3)). Empty without observations.
+    pub fn histogram_bins(&self) -> Vec<Bin> {
+        let mut v = self.observations();
+        if v.is_empty() {
+            return vec![];
+        }
+        v.sort_by(f64::total_cmp);
+        let (lo, hi) = (v[0], v[v.len() - 1]);
+        let span = hi - lo;
+        let n = v.len() as f64;
+        let width = if let Some(w) = self.bin_size.filter(|w| w.is_finite() && *w > 0.0) {
+            w
+        } else if let Some(k) = self.bin_count.filter(|k| *k > 0) {
+            span / f64::from(k)
+        } else {
+            let mean = v.iter().sum::<f64>() / n;
+            let sd = (v.iter().map(|x| (x - mean).powi(2)).sum::<f64>() / (n - 1.0).max(1.0)).sqrt();
+            3.49 * sd / n.cbrt()
+        };
+        let count = if span <= 0.0 || !width.is_finite() || width <= 0.0 { 1 } else { ((span / width).ceil() as usize).clamp(1, MAX_BINS) };
+        let width = if count == 1 && (span <= 0.0 || !width.is_finite() || width <= 0.0) { span.max(1.0) } else { width.max(span / MAX_BINS as f64) };
+        let mut bins: Vec<Bin> = (0..count).map(|i| Bin { lo: lo + width * i as f64, hi: lo + width * (i + 1) as f64, count: 0 }).collect();
+        for x in v {
+            // (lo, hi] bins, the first one also holding the minimum.
+            let i = (((x - lo) / width).ceil() as usize).saturating_sub(1).min(count - 1);
+            if let Some(b) = bins.get_mut(i) {
+                b.count += 1;
+            }
+        }
+        bins
+    }
+
+    /// A histogram (or Pareto) as the chart that draws it: a column chart of the bin counts with
+    /// touching columns, labelled by bin range. A Pareto sorts the bins by count and adds the
+    /// cumulative percentage as a line on a 0–100 % secondary axis.
+    pub fn histogram_view(&self) -> Chart {
+        let mut bins = self.histogram_bins();
+        let pareto = self.kind == ChartType::Pareto;
+        if pareto {
+            bins.sort_by_key(|b| std::cmp::Reverse(b.count));
+        }
+        let fmt = |v: f64| {
+            let r = (v * 100.0).round() / 100.0;
+            if (r - r.round()).abs() < 1e-9 { format!("{}", r.round() as i64) } else { format!("{r}") }
+        };
+        let first_lo = bins.iter().map(|b| b.lo).fold(f64::INFINITY, f64::min);
+        let mut v = Chart {
+            kind: if pareto { ChartType::Combo } else { ChartType::Column },
+            categories: bins
+                .iter()
+                .map(|b| if b.lo <= first_lo { format!("[{}, {}]", fmt(b.lo), fmt(b.hi)) } else { format!("({}, {}]", fmt(b.lo), fmt(b.hi)) })
+                .collect(),
+            series: vec![],
+            gap_width: 0.0,
+            raw: None,
+            subtotals: vec![],
+            ..self.clone()
+        };
+        let name = self.series.first().map(|s| s.name.clone()).unwrap_or_default();
+        let base = self.series.first().cloned().unwrap_or_default();
+        v.series.push(Series {
+            name,
+            values: bins.iter().map(|b| Some(b.count as f64)).collect(),
+            kind: pareto.then_some(ChartType::Column),
+            number_format: None,
+            ..base
+        });
+        if pareto {
+            let total = bins.iter().map(|b| b.count).sum::<usize>().max(1) as f64;
+            let mut run = 0.0;
+            v.series.push(Series {
+                name: "Cumulative %".into(),
+                values: bins
+                    .iter()
+                    .map(|b| {
+                        run += b.count as f64;
+                        Some(run / total)
+                    })
+                    .collect(),
+                kind: Some(ChartType::Line),
+                secondary_axis: true,
+                ..Default::default()
+            });
+            v.y2_min = Some(0.0);
+            v.y2_max = Some(1.0);
+            v.y2_major = Some(0.2);
+            v.y2_format = Some("0%".into());
+        }
+        v.vary_colors = false;
+        v
+    }
+
+    /// The box chart's groups (distinct category labels in order of appearance; one unnamed
+    /// group without categories) and, per series, each group's summary (None when it has no
+    /// points).
+    pub fn box_groups(&self) -> (Vec<String>, Vec<Vec<Option<BoxStats>>>) {
+        let mut groups: Vec<String> = Vec::new();
+        for c in &self.categories {
+            if !groups.contains(c) {
+                groups.push(c.clone());
+            }
+        }
+        if groups.is_empty() {
+            groups.push(String::new());
+        }
+        let stats = self
+            .series
+            .iter()
+            .map(|s| {
+                groups
+                    .iter()
+                    .map(|g| {
+                        let pts: Vec<f64> = s
+                            .values
+                            .iter()
+                            .enumerate()
+                            .filter(|(i, _)| self.categories.get(*i).map_or(g.is_empty() || self.categories.is_empty(), |c| c == g))
+                            .filter_map(|(_, v)| *v)
+                            .filter(|v| v.is_finite())
+                            .collect();
+                        box_stats(pts)
+                    })
+                    .collect()
+            })
+            .collect();
+        (groups, stats)
+    }
+}
+
+/// Excel's QUARTILE.EXC position `p·(n+1)` (1-based) on sorted data, clamped to the ends.
+fn quantile_exc(v: &[f64], p: f64) -> f64 {
+    let n = v.len();
+    let pos = (p * (n as f64 + 1.0)).clamp(1.0, n as f64);
+    let i = pos.floor() as usize;
+    let frac = pos - i as f64;
+    let a = v[i.saturating_sub(1).min(n - 1)];
+    let b = v[i.min(n - 1)];
+    a + (b - a) * frac
+}
+
+/// The summary of one group's points.
+pub fn box_stats(mut pts: Vec<f64>) -> Option<BoxStats> {
+    if pts.is_empty() {
+        return None;
+    }
+    pts.sort_by(f64::total_cmp);
+    let (q1, median, q3) = (quantile_exc(&pts, 0.25), quantile_exc(&pts, 0.5), quantile_exc(&pts, 0.75));
+    let iqr = q3 - q1;
+    let (lo_fence, hi_fence) = (q1 - 1.5 * iqr, q3 + 1.5 * iqr);
+    let inside: Vec<f64> = pts.iter().copied().filter(|v| *v >= lo_fence && *v <= hi_fence).collect();
+    let low = inside.first().copied().unwrap_or(q1).min(q1);
+    let high = inside.last().copied().unwrap_or(q3).max(q3);
+    let mean = pts.iter().sum::<f64>() / pts.len() as f64;
+    let outliers = pts.iter().copied().filter(|v| *v < lo_fence || *v > hi_fence).collect();
+    Some(BoxStats { low, q1, median, q3, high, mean, outliers })
+}
+
+#[cfg(test)]
+mod chartex_tests {
+    use super::*;
+
+    fn obs(v: &[f64]) -> Chart {
+        Chart {
+            kind: ChartType::Histogram,
+            series: vec![Series { values: v.iter().map(|x| Some(*x)).collect(), ..Default::default() }],
+            ..Default::default()
+        }
+    }
+
+    #[test]
+    fn histogram_bins_by_count_size_and_scott() {
+        let mut c = obs(&[1.0, 2.0, 2.0, 3.0, 4.0, 5.0, 9.0]);
+        c.bin_count = Some(4);
+        let b = c.histogram_bins();
+        assert_eq!(b.len(), 4);
+        assert_eq!((b[0].lo, b[0].hi), (1.0, 3.0));
+        // (lo, hi] bins with the minimum in the first: 1, 2, 2, 3 | 4, 5 | - | 9.
+        assert_eq!(b.iter().map(|b| b.count).collect::<Vec<_>>(), vec![4, 2, 0, 1]);
+        c.bin_count = None;
+        c.bin_size = Some(5.0);
+        assert_eq!(c.histogram_bins().iter().map(|b| b.count).collect::<Vec<_>>(), vec![6, 1]);
+        c.bin_size = None;
+        let auto = c.histogram_bins();
+        assert!(!auto.is_empty() && auto.iter().map(|b| b.count).sum::<usize>() == 7);
+        // A tiny bin size is capped; one value gives one bin.
+        c.bin_size = Some(1e-12);
+        assert!(c.histogram_bins().len() <= MAX_BINS);
+        assert_eq!(obs(&[3.0]).histogram_bins(), vec![Bin { lo: 3.0, hi: 4.0, count: 1 }]);
+        assert!(obs(&[]).histogram_bins().is_empty());
+    }
+
+    #[test]
+    fn pareto_view_sorts_bins_and_adds_the_cumulative_line() {
+        let mut c = obs(&[1.0, 5.0, 5.0, 5.0, 9.0, 9.0]);
+        c.kind = ChartType::Pareto;
+        c.bin_count = Some(3);
+        let v = c.histogram_view();
+        assert_eq!(v.kind, ChartType::Combo);
+        assert_eq!(v.series[0].values, vec![Some(3.0), Some(2.0), Some(1.0)]);
+        let cum = &v.series[1];
+        assert!(cum.secondary_axis && cum.kind == Some(ChartType::Line));
+        assert_eq!(cum.values.last(), Some(&Some(1.0)));
+        assert_eq!(v.categories[0], "(3.67, 6.33]");
+    }
+
+    #[test]
+    fn box_stats_use_exclusive_quartiles_and_fence_outliers() {
+        let b = box_stats(vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 100.0]).unwrap();
+        // QUARTILE.EXC on 8 points: positions 2.25, 4.5, 6.75.
+        assert_eq!((b.q1, b.median, b.q3), (2.25, 4.5, 6.75));
+        assert_eq!(b.outliers, vec![100.0]);
+        assert_eq!((b.low, b.high), (1.0, 7.0));
+        assert!(box_stats(vec![]).is_none());
+        let one = box_stats(vec![5.0]).unwrap();
+        assert_eq!((one.low, one.q1, one.median, one.q3, one.high), (5.0, 5.0, 5.0, 5.0, 5.0));
+    }
+
+    #[test]
+    fn box_groups_follow_category_labels() {
+        let c = Chart::sample(ChartType::BoxWhisker);
+        let (groups, stats) = c.box_groups();
+        assert_eq!(groups, vec!["Group A".to_string(), "Group B".to_string()]);
+        assert_eq!(stats.len(), 2);
+        assert!(stats.iter().all(|s| s.len() == 2 && s.iter().all(Option::is_some)));
+    }
+}
diff --git a/crates/pptx/src/read/chartex.rs b/crates/pptx/src/read/chartex.rs
index 1207df02..5c6e2f77 100644
--- a/crates/pptx/src/read/chartex.rs
+++ b/crates/pptx/src/read/chartex.rs
@@ -110,6 +110,10 @@ pub(crate) fn chartex_from(root: &El) -> Option<Chart> {
         if c.categories.is_empty() {
             c.categories = d.categories.clone();
         }
+        if let Some(b) = s.child("layoutPr").and_then(|l| l.child("binning")) {
+            c.bin_count = b.child("binCount").and_then(|n| n.u32("val")).filter(|n| *n > 0);
+            c.bin_size = b.child("binSize").and_then(|n| n.attr("val")).and_then(|v| v.parse::<f64>().ok()).filter(|v| v.is_finite() && *v > 0.0);
+        }
         if let Some(st) = s.child("layoutPr").and_then(|l| l.child("subtotals")) {
             c.subtotals = st.children_named("idx").filter_map(|i| i.u32("val")).map(|i| i as usize).take(MAX_POINTS).collect();
         }
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 98ac50cb..172acf49 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -365,9 +365,14 @@ fn plot_group(w: &mut W, c: &Chart, kind: ChartType, list: &[(usize, &Series)])
     w.close(tag);
 }
 
-/// The kept `chartEx` part of an Office 2016 chart (waterfall, funnel…) that is unchanged since
-/// it was read, without its workbook link; `None` when it was edited or isn't one.
+/// The `chartEx` part of an Office 2016 chart (waterfall, funnel…): the kept part when the chart
+/// is unchanged since it was read (without its workbook link), else one written from the model.
+/// `None` for other chart types.
 pub fn chartex_xml(c: &Chart) -> Option<Vec<u8>> {
+    kept_chartex(c).or_else(|| c.kind.is_chartex().then(|| build_chartex(c)))
+}
+
+fn kept_chartex(c: &Chart) -> Option<Vec<u8>> {
     let raw = c.raw.as_ref()?;
     let doc = crate::xml::parse(raw.as_bytes()).ok()?;
     let mut root = doc.root.clone();
@@ -502,3 +507,145 @@ pub fn chart_xml(c: &Chart) -> Vec<u8> {
     w.close("c:chartSpace");
     w.finish()
 }
+
+/// A `cx:tx` holding plain text.
+fn cx_text(w: &mut W, t: &str) {
+    w.open0("cx:tx");
+    w.open0("cx:txData");
+    w.open0("cx:v");
+    w.text(t);
+    w.close("cx:v");
+    w.close("cx:txData");
+    w.close("cx:tx");
+}
+
+/// A `cx:lvl` of points.
+fn cx_level(w: &mut W, pts: &[String], format: Option<&str>) {
+    let mut a = A::new().a("ptCount", pts.len());
+    if let Some(f) = format {
+        a = a.a("formatCode", f);
+    }
+    w.open("cx:lvl", a);
+    for (i, p) in pts.iter().enumerate() {
+        w.open("cx:pt", A::new().a("idx", i));
+        w.text(p);
+        w.close("cx:pt");
+    }
+    w.close("cx:lvl");
+}
+
+/// Writes an Office 2016 chart from the model, as PowerPoint lays the part out: one `cx:data`
+/// per series (categories and values), then the plot area with each series' layout, the axes
+/// the layout uses, the title and the legend.
+pub fn build_chartex(c: &Chart) -> Vec<u8> {
+    let mut w = W::new();
+    w.open("cx:chartSpace", A::new().a("xmlns:a", NS_A).a("xmlns:r", NS_R).a("xmlns:cx", NS_CX));
+    w.open0("cx:chartData");
+    for (i, s) in c.series.iter().enumerate() {
+        w.open("cx:data", A::new().a("id", i));
+        if !c.categories.is_empty() {
+            w.open("cx:strDim", A::new().a("type", "cat"));
+            cx_level(&mut w, &c.categories, None);
+            w.close("cx:strDim");
+        }
+        let ty = if matches!(c.kind, ChartType::Treemap | ChartType::Sunburst) { "size" } else { "val" };
+        w.open("cx:numDim", A::new().a("type", ty));
+        let vals: Vec<String> = s.values.iter().map(|v| v.map(fmt_num).unwrap_or_default()).collect();
+        cx_level(&mut w, &vals, Some(s.number_format.as_deref().unwrap_or("General")));
+        w.close("cx:numDim");
+        w.close("cx:data");
+    }
+    w.close("cx:chartData");
+    w.open0("cx:chart");
+    if let Some(t) = &c.title {
+        w.open("cx:title", A::new().a("pos", "t").a("align", "ctr").a("overlay", "0"));
+        cx_text(&mut w, t);
+        w.close("cx:title");
+    }
+    w.open0("cx:plotArea");
+    w.open0("cx:plotAreaRegion");
+    let layout = match c.kind {
+        ChartType::Waterfall => "waterfall",
+        ChartType::Funnel => "funnel",
+        ChartType::Treemap => "treemap",
+        ChartType::Sunburst => "sunburst",
+        ChartType::BoxWhisker => "boxWhisker",
+        _ => "clusteredColumn",
+    };
+    let one = !matches!(c.kind, ChartType::BoxWhisker);
+    for (i, s) in c.series.iter().enumerate().take(if one { 1 } else { usize::MAX }) {
+        w.open("cx:series", A::new().a("layoutId", layout).a("uniqueId", format!("{{DC00000{i}-0000-4000-8000-000000000000}}")));
+        cx_text(&mut w, &s.name);
+        if s.data_labels.unwrap_or(c.data_labels) {
+            w.open("cx:dataLabels", A::new().a("pos", if c.kind == ChartType::Funnel { "ctr" } else { "outEnd" }));
+            w.empty("cx:visibility", A::new().a("seriesName", "0").a("categoryName", "0").a("value", "1"));
+            w.close("cx:dataLabels");
+        }
+        w.empty("cx:dataId", A::new().a("val", i));
+        match c.kind {
+            ChartType::Waterfall if !c.subtotals.is_empty() => {
+                w.open0("cx:layoutPr");
+                w.open0("cx:subtotals");
+                for t in &c.subtotals {
+                    w.empty("cx:idx", A::new().a("val", t));
+                }
+                w.close("cx:subtotals");
+                w.close("cx:layoutPr");
+            }
+            ChartType::Histogram | ChartType::Pareto => {
+                w.open0("cx:layoutPr");
+                w.open("cx:binning", A::new().a("intervalClosed", "r"));
+                if let Some(size) = c.bin_size {
+                    w.empty("cx:binSize", A::new().a("val", fmt_num(size)));
+                } else if let Some(n) = c.bin_count {
+                    w.empty("cx:binCount", A::new().a("val", n));
+                }
+                w.close("cx:binning");
+                w.close("cx:layoutPr");
+            }
+            ChartType::BoxWhisker => {
+                w.open0("cx:layoutPr");
+                w.empty("cx:visibility", A::new().a("meanLine", "0").a("meanMarker", "1").a("nonoutliers", "0").a("outliers", "1"));
+                w.empty("cx:statistics", A::new().a("quartileMethod", "exclusive"));
+                w.close("cx:layoutPr");
+            }
+            _ => {}
+        }
+        w.close("cx:series");
+    }
+    if c.kind == ChartType::Pareto {
+        w.open("cx:series", A::new().a("layoutId", "paretoLine").a("ownerIdx", "0").a("uniqueId", "{DC0000FF-0000-4000-8000-000000000000}"));
+        w.empty("cx:axisId", A::new().a("val", "2"));
+        w.close("cx:series");
+    }
+    w.close("cx:plotAreaRegion");
+    if !matches!(c.kind, ChartType::Treemap | ChartType::Sunburst) {
+        w.open("cx:axis", A::new().a("id", "0"));
+        w.empty("cx:catScaling", A::new().a("gapWidth", if matches!(c.kind, ChartType::Histogram | ChartType::Pareto) { "0" } else { "0.5" }));
+        w.empty0("cx:tickLabels");
+        w.close("cx:axis");
+        if c.kind != ChartType::Funnel {
+            w.open("cx:axis", A::new().a("id", "1"));
+            w.empty0("cx:valScaling");
+            if c.gridlines {
+                w.empty0("cx:majorGridlines");
+            }
+            w.empty0("cx:tickLabels");
+            w.close("cx:axis");
+        }
+        if c.kind == ChartType::Pareto {
+            w.open("cx:axis", A::new().a("id", "2"));
+            w.empty("cx:valScaling", A::new().a("max", "1").a("min", "0"));
+            w.empty0("cx:units");
+            w.empty0("cx:tickLabels");
+            w.close("cx:axis");
+        }
+    }
+    w.close("cx:plotArea");
+    if let Some(pos) = &c.legend {
+        w.empty("cx:legend", A::new().a("pos", pos.as_str()).a("align", "ctr").a("overlay", "0"));
+    }
+    w.close("cx:chart");
+    w.close("cx:chartSpace");
+    w.finish()
+}
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index 58d79b6f..addcb39f 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -1095,7 +1095,8 @@ fn chartex_waterfall_reads_and_round_trips() {
     let again = deckcraft_pptx::import(&out).unwrap();
     assert_eq!(chart(&again).map(|c| (c.kind, c.categories, c.series.len())), Some((ChartType::Waterfall, c.categories.clone(), 1)));
 
-    // Edited: the kept part no longer matches, so only a plain chart is written.
+    // Edited: the kept part no longer matches, so a chartEx part is written from the model,
+    // still a waterfall with the new value.
     let mut edited = doc.clone();
     for sl in &mut edited.slides {
         for sh in &mut Arc::make_mut(sl).shapes {
@@ -1105,6 +1106,57 @@ fn chartex_waterfall_reads_and_round_trips() {
         }
     }
     let out = deckcraft_pptx::export(&edited).unwrap();
-    assert!(pkg_part(&out, "ppt/charts/chartEx1.xml").is_none());
-    assert!(!String::from_utf8(pkg_part(&out, &slide).unwrap()).unwrap().contains("cx1"));
+    let ex = String::from_utf8(pkg_part(&out, "ppt/charts/chartEx1.xml").expect("a written chartEx part")).unwrap();
+    assert!(ex.contains(r#"layoutId="waterfall""#), "{ex}");
+    assert!(String::from_utf8(pkg_part(&out, &slide).unwrap()).unwrap().contains("cx1"));
+    let again = chart(&deckcraft_pptx::import(&out).unwrap()).unwrap();
+    assert_eq!(again.kind, ChartType::Waterfall);
+    assert_eq!(again.series[0].values[1], Some(55.0));
+    assert_eq!(again.subtotals, c.subtotals);
+}
+
+/// New Office 2016 charts made in DeckCraft are written as chartEx parts that read back as the
+/// same type, data and options.
+#[test]
+fn chartex_new_charts_save_as_their_own_type() {
+    use deckcraft_engine::Session;
+    for (ty, kind) in [
+        ("waterfall", ChartType::Waterfall),
+        ("funnel", ChartType::Funnel),
+        ("treemap", ChartType::Treemap),
+        ("sunburst", ChartType::Sunburst),
+        ("histogram", ChartType::Histogram),
+        ("pareto", ChartType::Pareto),
+        ("boxwhisker", ChartType::BoxWhisker),
+    ] {
+        let chart = |d: &Presentation| -> Option<Chart> {
+            d.slides.iter().flat_map(|s| s.shapes.iter()).find_map(|sh| match &sh.kind {
+                ShapeKind::Chart(c) => Some((**c).clone()),
+                _ => None,
+            })
+        };
+        let mut s = Session::with_new();
+        s.execute("slide.new", &serde_json::json!({"layout": "blank"})).unwrap();
+        s.execute("insert.chart", &serde_json::json!({"type": ty})).unwrap();
+        let id = s.doc().unwrap().selection.shapes[0].0;
+        let opts = match kind {
+            ChartType::Histogram | ChartType::Pareto => serde_json::json!({"id": id, "binCount": 4, "title": "T"}),
+            ChartType::Waterfall => serde_json::json!({"id": id, "subtotals": [3], "title": "T"}),
+            _ => serde_json::json!({"id": id, "title": "T"}),
+        };
+        s.execute("chart.options", &opts).unwrap();
+        let doc = &s.doc().unwrap().doc;
+        let before = chart(doc).unwrap();
+        let out = deckcraft_pptx::export(doc).unwrap();
+        assert!(pkg_part(&out, "ppt/charts/chartEx1.xml").is_some(), "{ty}: no chartEx part");
+        assert!(pkg_part(&out, "ppt/charts/chart1.xml").is_some(), "{ty}: no fallback chart");
+        let after = chart(&deckcraft_pptx::import(&out).unwrap()).unwrap();
+        assert_eq!(after.kind, kind, "{ty}");
+        assert_eq!(after.title.as_deref(), Some("T"), "{ty}");
+        assert_eq!(after.categories, before.categories, "{ty}");
+        let n = if matches!(kind, ChartType::BoxWhisker) { before.series.len() } else { 1 };
+        assert_eq!(after.series.len(), n, "{ty}");
+        assert_eq!(after.series[0].values, before.series[0].values, "{ty}");
+        assert_eq!((after.bin_count, after.subtotals.clone()), (before.bin_count, before.subtotals.clone()), "{ty}");
+    }
 }
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index 5df5dd7e..82d1116d 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -134,6 +134,19 @@ fn legend_layout(pos: &str, size: (f64, f64), area: Rect, base: f64, overlay: bo
 }
 
 pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h: f64) {
+    match c.kind {
+        // Histograms and Pareto charts are drawn as the column (and line) chart of their bins.
+        ChartType::Histogram | ChartType::Pareto => draw_inner(ctx, rctx, &c.histogram_view(), m, w, h, None),
+        ChartType::BoxWhisker => {
+            let (view, boxes) = crate::chartex::box_view(c);
+            draw_inner(ctx, rctx, &view, m, w, h, Some(&boxes));
+        }
+        _ => draw_inner(ctx, rctx, c, m, w, h, None),
+    }
+}
+
+#[allow(clippy::too_many_arguments)]
+fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h: f64, boxes: Option<&crate::chartex::Boxes>) {
     let text_col = c.text_color.as_ref().map(|t| rctx.color(t, None)).unwrap_or(Rgba::rgb(0x59, 0x59, 0x59));
     let grid_col = Rgba::rgb(0xD9, 0xD9, 0xD9);
     if let Some(f) = &c.chart_fill {
@@ -400,6 +413,10 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             );
         }
     }
+    if let Some(b) = boxes {
+        crate::chartex::draw_boxes(ctx, rctx, c, b, m, plot, band, horiz, &to_v);
+        return;
+    }
     let zero = to_v(0.0f64.clamp(min, max));
     if let Some(bk) = bar_kind {
         let bars: Vec<(usize, &deckcraft_model::chart::Series)> =
diff --git a/crates/render/src/chartex.rs b/crates/render/src/chartex.rs
index faf8ec2e..04d0ab1f 100644
--- a/crates/render/src/chartex.rs
+++ b/crates/render/src/chartex.rs
@@ -1,8 +1,9 @@
-//! Office 2016 chart layouts the bar renderer can't draw: funnel, treemap and sunburst
-//! (waterfall bars are drawn by [`crate::chart`]).
+//! Office 2016 chart layouts the bar renderer can't draw: funnel, treemap, sunburst and the
+//! boxes of a box and whisker chart (waterfall bars are drawn by [`crate::chart`], histograms as
+//! the column chart of their bins).
 
 use deckcraft_color::Rgba;
-use deckcraft_model::chart::{Chart, ChartType};
+use deckcraft_model::chart::{BoxStats, Chart, ChartType};
 use deckcraft_model::resolve::Ctx;
 use deckcraft_model::text::{Align, Anchor};
 use kurbo::{Affine, BezPath, Point, Rect, Shape as _};
@@ -188,6 +189,102 @@ fn sunburst(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rec
     }
 }
 
+/// A box chart's summaries: per series, per group.
+pub struct Boxes {
+    pub stats: Vec<Vec<Option<BoxStats>>>,
+}
+
+/// A box and whisker chart as the frame the bar renderer draws (value axis, gridlines, one
+/// category per group, legend by series), and the boxes to draw in it. The frame's values are
+/// each group's extremes, so the value axis covers every whisker and outlier.
+pub fn box_view(c: &Chart) -> (Chart, Boxes) {
+    let (groups, stats) = c.box_groups();
+    let mut v = c.clone();
+    v.kind = ChartType::Column;
+    v.categories = groups;
+    v.raw = None;
+    let ext = |b: &BoxStats, hi: bool| {
+        let o = b.outliers.iter().copied();
+        if hi { o.fold(b.high, f64::max) } else { o.fold(b.low, f64::min) }
+    };
+    let lowest = stats.iter().flatten().flatten().map(|b| ext(b, false)).fold(f64::INFINITY, f64::min);
+    for (s, st) in v.series.iter_mut().zip(&stats) {
+        s.values = st.iter().map(|b| b.as_ref().map(|b| ext(b, true))).collect();
+    }
+    if lowest.is_finite() && lowest < 0.0 && v.y_min.is_none() {
+        // The frame's values are the highs; below zero the axis must reach the lowest point too.
+        let mag = 10f64.powf(lowest.abs().log10().floor());
+        v.y_min = Some((lowest / mag).floor() * mag);
+    }
+    (v, Boxes { stats })
+}
+
+/// Boxes from the first to the third quartile with the median line and a mean marker, whiskers
+/// to the furthest points within 1.5 IQR, and outliers as dots; series side by side in each
+/// group's band.
+#[allow(clippy::too_many_arguments)]
+pub fn draw_boxes(
+    ctx: &mut RenderContext,
+    rctx: &Ctx,
+    c: &Chart,
+    b: &Boxes,
+    m: Affine,
+    plot: Rect,
+    band: f64,
+    horiz: bool,
+    to_v: &dyn Fn(f64) -> f64,
+) {
+    let ns = b.stats.len().max(1);
+    let group = band / (1.0 + c.gap_width.clamp(0.0, 5.0));
+    let w = group / ns as f64;
+    let line = Rgba::rgb(0x40, 0x40, 0x40);
+    for (si, per) in b.stats.iter().enumerate() {
+        let fill = series_color(rctx, c, si);
+        for (gi, st) in per.iter().enumerate() {
+            let Some(st) = st else { continue };
+            let c0 = if horiz { plot.y0 } else { plot.x0 } + band * gi as f64 + (band - group) / 2.0 + w * si as f64;
+            let (a, z) = (c0 + w * 0.1, c0 + w * 0.9);
+            let mid = (a + z) / 2.0;
+            // Along the category axis `a..z`, along the value axis `to_v`.
+            let rect = |p: f64, q: f64, u: f64, v: f64| if horiz { Rect::new(u.min(v), p, u.max(v), q) } else { Rect::new(p, u.min(v), q, u.max(v)) };
+            let pt = |along: f64, val: f64| if horiz { Point::new(val, along) } else { Point::new(along, val) };
+            ctx.set_transform(m);
+            ctx.set_paint(color(fill, 1.0));
+            let bx = rect(a, z, to_v(st.q1), to_v(st.q3));
+            ctx.fill_rect(&bx);
+            let mut p = BezPath::new();
+            // Whiskers with caps, and the median.
+            for (from, to) in [(st.q3, st.high), (st.q1, st.low)] {
+                p.move_to(pt(mid, to_v(from)));
+                p.line_to(pt(mid, to_v(to)));
+                p.move_to(pt(mid - w * 0.2, to_v(to)));
+                p.line_to(pt(mid + w * 0.2, to_v(to)));
+            }
+            p.move_to(pt(a, to_v(st.median)));
+            p.line_to(pt(z, to_v(st.median)));
+            ctx.set_paint(color(line, 1.0));
+            ctx.set_stroke(kurbo::Stroke::new(1.25));
+            ctx.stroke_path(&p);
+            ctx.stroke_path(&bx.to_path(0.1));
+            // The mean as an x.
+            let (mx, r) = (pt(mid, to_v(st.mean)), (w * 0.08).clamp(1.5, 5.0));
+            let mut x = BezPath::new();
+            x.move_to((mx.x - r, mx.y - r));
+            x.line_to((mx.x + r, mx.y + r));
+            x.move_to((mx.x - r, mx.y + r));
+            x.line_to((mx.x + r, mx.y - r));
+            ctx.stroke_path(&x);
+            for o in &st.outliers {
+                let q = pt(mid, to_v(*o));
+                ctx.set_paint(color(fill, 1.0));
+                ctx.fill_path(&kurbo::Circle::new(q, r).to_path(0.1));
+                ctx.set_paint(color(line, 1.0));
+                ctx.stroke_path(&kurbo::Circle::new(q, r).to_path(0.1));
+            }
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 3b9e1a3a..7b179485 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1746,3 +1746,34 @@ fn office_2016_charts_draw_their_own_layouts() {
         assert!(covered > 1000, "{kind:?}: {covered} samples inked");
     }
 }
+
+/// Histograms draw touching columns of their bins, Pareto charts add the cumulative line, and
+/// box and whisker charts draw a box per group and series.
+#[test]
+fn histogram_pareto_and_box_charts_draw() {
+    let shot = |c: Chart| {
+        let sh = Shape { id: ShapeId(622), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
+        render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() })
+    };
+    let inked = |img: &crate::Image| {
+        (0..540)
+            .step_by(6)
+            .flat_map(|y| (0..960).step_by(6).map(move |x| (x, y)))
+            .filter(|&(x, y)| {
+                let p = img.pixel(x, y);
+                p[0] < 200 || p[1] < 200 || p[2] < 200
+            })
+            .count()
+    };
+    let mut empty = Chart::sample(ChartType::Histogram);
+    empty.series[0].values.clear();
+    let blank = inked(&shot(empty));
+    for kind in [ChartType::Histogram, ChartType::Pareto, ChartType::BoxWhisker] {
+        let img = shot(Chart::sample(kind));
+        if let Ok(dir) = std::env::var("DECKCRAFT_CHART_SHOTS") {
+            let _ = std::fs::write(format!("{dir}/{kind:?}.png"), img.to_png());
+        }
+        let n = inked(&img);
+        assert!(n > blank + 400, "{kind:?}: {n} inked samples (blank {blank})");
+    }
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..386dd9db 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1046,8 +1046,13 @@ fn insert(app: &mut SlideApp, ui: &mut Ui) {
         big(app, ui, Icon::SmartArt, "SmartArt", "app.dialog", json!({"id": "smartart"}));
         let r = big_button(ui, Icon::Chart, "Chart", enabled(app, "insert.chart"));
         egui::Popup::menu(&r).show(|ui| {
-            for k in deckcraft_model::chart::ChartType::MAIN {
-                if ui.button(k.label()).clicked() {
+            for k in chart_menu_types() {
+                if k.is_none() {
+                    ui.separator();
+                }
+                if let Some(k) = k
+                    && ui.button(k.label()).clicked()
+                {
                     run(app, "insert.chart", json!({"type": format!("{k:?}")}));
                 }
             }
@@ -2304,7 +2309,11 @@ fn chart_design(app: &mut SlideApp, ui: &mut Ui) {
     group(ui, |ui| {
         let r = big_button(ui, Icon::ChangeChartType, "Change\nChart Type", true);
         egui::Popup::menu(&r).show(|ui| {
-            for k in deckcraft_model::chart::ChartType::MAIN {
+            for k in chart_menu_types() {
+                let Some(k) = k else {
+                    ui.separator();
+                    continue;
+                };
                 if ui.button(k.label()).clicked() {
                     // Replace the chart's type keeping its data.
                     if let Some(id) = app.session.active().and_then(|d| d.selection.shapes.first().copied()) {
@@ -2420,3 +2429,13 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+/// The chart types in the Insert Chart and Change Chart Type menus: the main ones, a separator
+/// (`None`), then the Office 2016 types not already listed.
+fn chart_menu_types() -> Vec<Option<deckcraft_model::chart::ChartType>> {
+    use deckcraft_model::chart::ChartType;
+    let mut v: Vec<Option<ChartType>> = ChartType::MAIN.iter().copied().map(Some).collect();
+    v.push(None);
+    v.extend(ChartType::OFFICE_2016.iter().copied().filter(|k| !ChartType::MAIN.contains(k)).map(Some));
+    v
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..7d0927f2 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -73,7 +73,7 @@ the round trip even though DeckCraft doesn't model it.
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
-| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
+| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept; edited and new ones written from the model with a plain-chart fallback. Only the innermost hierarchy level; no region maps |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
diff --git a/docs/gaps.md b/docs/gaps.md
index 10e2fa41..253022cd 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -146,10 +146,12 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, Pareto,
-  box & whisker) are read for their data and written back unchanged. Waterfalls (floating bars,
-  totals, connectors), funnels, treemaps (squarified) and sunbursts (innermost ring) are drawn;
-  histograms and box & whisker still use the column renderer, an edited one is saved as a plain
-  column chart, and region maps aren't read.
+  box & whisker) are read, drawn, inserted, edited and saved as `chartEx` (kept unchanged, else
+  written from the model, with a plain chart fallback). Waterfalls float and total, funnels,
+  treemaps (squarified) and sunbursts (innermost ring only) have their own layouts, histograms and
+  Paretos bin their data (count, width or Scott's rule), and box & whisker charts use exclusive
+  quartiles with 1.5 IQR whiskers. Multi-level treemap and sunburst hierarchies, inclusive
+  quartiles and region maps remain.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 

From ec725a4e6b5476e6c58ac7acb3d5a0cdd986c188 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:10:03 +0300
Subject: [PATCH 211/376] Notes Page view: draw master text wrapped, as the PDF
 does

pdf::master_text_pieces turns the text engine's layout of the notes
master's header, date, footer and page number into per-run, per-line
pieces scaled to the page; the Notes Page view paints them in their
sizes and colours. Stacked on #583.
---
 crates/pdf/src/lib.rs        | 48 ++++++++++++++++++++++++++++++++++++
 crates/pdf/src/tests.rs      |  8 ++++++
 crates/ui-egui/src/sorter.rs | 11 +++++----
 docs/gaps.md                 |  7 +++---
 4 files changed, 66 insertions(+), 8 deletions(-)

diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index fca04d71..b3870222 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -233,6 +233,54 @@ pub fn master_text_style(pres: &Presentation, m: &deckcraft_model::Master, sh: &
     TextStyle { family, size: r.size.unwrap_or(12.0).clamp(1.0, 400.0), bold: r.bold == Some(true), italic: r.italic == Some(true), color }
 }
 
+/// One laid-out piece of master text on a page of `paper` points: a run's text on one line, its
+/// baseline start and its size, colour, weight and slant.
+#[derive(Clone, Debug, PartialEq)]
+pub struct TextPiece {
+    pub at: (f64, f64),
+    pub text: String,
+    pub size: f64,
+    pub color: deckcraft_model::Rgba,
+    pub bold: bool,
+    pub italic: bool,
+}
+
+/// The header, date, footer and page number of `m` for page `n`, laid out by the text engine
+/// (wrapped, mixed formatting) and scaled to `paper`, for drawing without glyph access (the
+/// Notes Page view).
+pub fn master_text_pieces(pres: &Presentation, m: &deckcraft_model::Master, paper: (f64, f64), n: usize) -> Vec<TextPiece> {
+    let (kx, ky) = (paper.0 / pres.notes_size.width.max(1.0), paper.1 / pres.notes_size.height.max(1.0));
+    let mut out = vec![];
+    for pt in deckcraft_render::place_master_texts(pres, m, n) {
+        for run in &pt.layout.runs {
+            let Some(g) = run.glyphs.first() else { continue };
+            let text: String = pt
+                .body
+                .paragraphs
+                .get(run.para)
+                .map(|p| p.runs.iter().map(|r| r.text.as_str()).collect::<String>())
+                .unwrap_or_default()
+                .chars()
+                .skip(run.chars.0)
+                .take(run.chars.1.saturating_sub(run.chars.0))
+                .collect();
+            if text.trim().is_empty() {
+                continue;
+            }
+            let p = pt.transform * kurbo::Point::new(g.1, g.2);
+            out.push(TextPiece {
+                at: (p.x * kx, p.y * ky),
+                text,
+                size: run.size * ky,
+                color: run.color,
+                bold: run.fake_bold || run.face.weight >= 600.0,
+                italic: run.fake_italic || run.face.italic,
+            });
+        }
+    }
+    out
+}
+
 /// The header, date, footer and page-number text a master puts on page `n`, with where it goes,
 /// whether it's right-aligned and its style. Placeholders with no text are left out; the page
 /// number is always `n`.
diff --git a/crates/pdf/src/tests.rs b/crates/pdf/src/tests.rs
index 1af447ed..321ae28c 100644
--- a/crates/pdf/src/tests.rs
+++ b/crates/pdf/src/tests.rs
@@ -176,6 +176,14 @@ fn master_text_wraps_and_keeps_mixed_formatting() {
     assert!(h.runs.iter().any(|r| r.color == Rgba::rgb(200, 0, 0)));
     let num: String = placed[1].body.text();
     assert_eq!(num, "4");
+    // The same layout as pieces for the Notes Page view: on more than one line, scaled to paper.
+    let pieces = master_text_pieces(&p, &m, (306.0, 396.0), 4);
+    let mut ys: Vec<i64> = pieces.iter().map(|x| x.at.1.round() as i64).collect();
+    ys.dedup();
+    assert!(ys.len() >= 3, "two header lines and the number: {pieces:?}");
+    assert!(pieces.iter().any(|x| x.bold && (x.size - 9.0).abs() < 0.5), "18 pt bold at half size");
+    assert!(pieces.iter().any(|x| x.color == Rgba::rgb(200, 0, 0) && !x.bold));
+    assert!(pieces.iter().any(|x| x.text == "4"));
     p.notes_master = Some(Arc::new(m));
     assert!(export(&p, &PdfOptions { layout: PageLayout::Notes, ..Default::default() }).unwrap().starts_with(b"%PDF"));
 }
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index 2b426669..8cf333c5 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -132,11 +132,12 @@ pub fn notes_page(app: &mut SlideApp, ui: &mut Ui) {
     let srect = to_screen((slide_box.x0, slide_box.y0, slide_box.x1, slide_box.y1));
     let sw = srect.width();
     if let Some(m) = doc.notes_master.as_deref() {
-        for (r, text, right, st) in deckcraft_engine::pdf::master_texts(&doc, m, paper, idx + 1) {
-            let r = to_screen((r.x0, r.y0, r.x1, r.y1));
-            let (at, align) = if right { (r.right_center(), egui::Align2::RIGHT_CENTER) } else { (r.left_center(), egui::Align2::LEFT_CENTER) };
-            let c = Color32::from_rgba_unmultiplied(st.color.r, st.color.g, st.color.b, st.color.a);
-            ui.painter().text(at, align, text.lines().next().unwrap_or(""), theme::font((st.size as f32 * k).max(6.0)), c);
+        // Laid out by the text engine as on the PDF page: wrapped, each run in its size and colour.
+        for piece in deckcraft_engine::pdf::master_text_pieces(&doc, m, paper, idx + 1) {
+            let size = (piece.size as f32 * k).max(4.0);
+            let at = page.min + vec2(piece.at.0 as f32 * k, piece.at.1 as f32 * k - size * 0.8);
+            let c = Color32::from_rgba_unmultiplied(piece.color.r, piece.color.g, piece.color.b, piece.color.a);
+            ui.painter().text(at, egui::Align2::LEFT_TOP, &piece.text, theme::font(size), c);
         }
     }
     let ppp = ui.ctx().pixels_per_point();
diff --git a/docs/gaps.md b/docs/gaps.md
index e3a1091b..711f357d 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -166,9 +166,9 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
   PDF) place the slide and notes where the notes master does and print its header, date, footer
   and page number in their own fonts, sizes and colours; PDF handouts print the handout master's.
   Notes Master view previews the slide in its slide-image placeholder. PDF pages lay master text
-  out with the text engine (wrapping, mixed formatting). Left: the on-screen Notes Page view still
-  draws it as one line per placeholder.
-- **Estimate:** 0.5 h.
+  out with the text engine (wrapping, mixed formatting), and the Notes Page view draws the same
+  layout. Left: the view draws it in the interface font (sizes, colours and weights kept).
+- **Estimate:** done for beta.
 
 ### Edit points, text warp, 3-D
 - **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
@@ -262,6 +262,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Notes Page view draws master text wrapped, as the PDF does |
 | 2026-10-14 | trivial | PDF master header/footer text wraps and keeps mixed formatting |
 | 2026-10-14 | trivial | Notes Master slide preview; master header/footer text keeps its formatting |
 | 2026-10-14 | minor | Notes pages and PDF handouts follow the notes and handout masters |

From 0cbee85ea8b849cd0d76eedf0dfbaed1aca75228 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:12:38 +0300
Subject: [PATCH 212/376] File: six original starter decks
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

File › New and the start screen offer Briefing, Lesson, Pitch, Field Notes,
Quarterly and Evening Talk. Each is a few slides of our own text on one of
our themes. file.new takes template, and file.templates lists them. Passing
a theme as well, or blank, is refused. PowerPoint's large gallery is still
open.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                            |   4 +-
 crates/engine/src/cmd/file.rs         |  58 ++++-
 crates/engine/src/lib.rs              |   1 +
 crates/engine/src/templates.rs        | 337 ++++++++++++++++++++++++++
 crates/ui-egui/src/backstage.rs       |  53 +++-
 crates/ui-egui/src/backstage_tests.rs |  15 ++
 docs/gaps.md                          |  10 +-
 docs/roadmap.md                       |   7 +-
 docs/target-app-parity.md             |   8 +-
 docs/ui-parity.md                     |   7 +-
 10 files changed, 472 insertions(+), 28 deletions(-)
 create mode 100644 crates/engine/src/templates.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..d3216412 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (six original starter decks; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | File › New starter decks: Briefing, Lesson, Pitch, Field Notes, Quarterly and Evening Talk, original text on our themes (`file.new {template}`, `file.templates`). The large template gallery is still open |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: six original starter decks |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..7490dae8 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -8,7 +8,16 @@ use crate::{DocState, EngineError, Result, Session};
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![
-        cmd!(noundo "file.new", "New Presentation", ["File"], Some("Cmd+N"), "{theme?: name, size?: [w,h] pt, blank?: bool}", always, new),
+        cmd!(
+            noundo "file.new",
+            "New Presentation",
+            ["File"],
+            Some("Cmd+N"),
+            "{theme?: name, template?: starter name, size?: [w,h] pt, blank?: bool}",
+            always,
+            new
+        ),
+        cmd!(query "file.templates", "Starter Templates", [], None, "{} → [{name, summary, theme, slides}]", always, templates),
         cmd!(noundo "file.open", "Open…", ["File"], Some("Cmd+O"), "{path}", always, open),
         cmd!(noundo "file.openBytes", "Open Data", [], None, "{name, data: base64}", always, open_bytes),
         cmd!(noundo "file.save", "Save", ["File"], Some("Cmd+S"), "{path?, format?: deckcraft|pptx}", has_doc, save),
@@ -49,18 +58,51 @@ fn theme_named(name: &str) -> Option<deckcraft_model::Theme> {
     deckcraft_model::theme::builtin_themes().into_iter().find(|t| t.name.eq_ignore_ascii_case(name))
 }
 
-fn new(s: &mut Session, p: &Value) -> Result<Value> {
-    let theme = str_param(p, "theme").and_then(theme_named).unwrap_or_default();
-    let size = p
-        .get("size")
+fn slide_size(p: &Value) -> deckcraft_geom::Size {
+    p.get("size")
         .and_then(Value::as_array)
         .and_then(|a| Some(deckcraft_geom::Size::new(a.first()?.as_f64()?, a.get(1)?.as_f64()?)))
         .filter(|s| s.width >= 1.0 && s.height >= 1.0 && s.width < 5000.0 && s.height < 5000.0)
-        .unwrap_or(defaults::WIDE);
-    let doc = defaults::blank_presentation(size, theme, !bool_or(p, "blank", false));
+        .unwrap_or(defaults::WIDE)
+}
+
+fn templates(_s: &mut Session, _p: &Value) -> Result<Value> {
+    Ok(json!({
+        "templates": crate::templates::starters().iter().map(|t| json!({
+            "name": t.name,
+            "summary": t.summary,
+            "theme": t.theme,
+            "slides": t.slides.len(),
+        })).collect::<Vec<_>>(),
+    }))
+}
+
+fn new(s: &mut Session, p: &Value) -> Result<Value> {
+    let template = str_param(p, "template").filter(|t| !t.is_empty());
+    let theme_name = str_param(p, "theme").filter(|t| !t.is_empty());
+    if template.is_some() && theme_name.is_some() {
+        return Err(bad("file.new", "pass `theme` or `template`, not both"));
+    }
+    if template.is_some() && bool_or(p, "blank", false) {
+        return Err(bad("file.new", "a template is not a blank presentation"));
+    }
+    let size = slide_size(p);
+    let (doc, template_name) = if let Some(name) = template {
+        let doc = crate::templates::build(name, size)?;
+        let chosen = crate::templates::find(name).map(|t| t.name);
+        (doc, chosen)
+    } else {
+        let theme = theme_name.and_then(theme_named).unwrap_or_default();
+        (defaults::blank_presentation(size, theme, !bool_or(p, "blank", false)), None)
+    };
+    let slides = doc.slides.len();
     let title = s.next_untitled();
     let i = s.add_document(DocState::new(doc, None, title));
-    Ok(json!({"document": i}))
+    let mut out = json!({"document": i, "slides": slides});
+    if let Some(name) = template_name {
+        out["template"] = json!(name);
+    }
+    Ok(out)
 }
 
 /// Recognise and read presentation bytes (native, PPTX).
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..f0c83183 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -15,6 +15,7 @@ pub mod keys;
 pub mod links;
 pub mod recovery;
 pub mod sample;
+pub mod templates;
 pub mod tools;
 
 use std::sync::Arc;
diff --git a/crates/engine/src/templates.rs b/crates/engine/src/templates.rs
new file mode 100644
index 00000000..eda9aa15
--- /dev/null
+++ b/crates/engine/src/templates.rs
@@ -0,0 +1,337 @@
+//! Original starter presentations for File › New.
+//!
+//! Each deck is a few slides of our own text on one of our themes. Nothing here is copied from
+//! another product's templates.
+
+use std::sync::Arc;
+
+use deckcraft_geom::Size;
+use deckcraft_model::text::TextBody;
+use deckcraft_model::{Presentation, defaults};
+use serde_json::Value;
+
+use crate::Result;
+use crate::cmd::{bad, slide::find_layout};
+
+/// One slide of a starter: a layout, a title, text for each non-title placeholder in order, and
+/// optional speaker notes.
+pub struct SlideSeed {
+    pub layout: &'static str,
+    pub title: &'static str,
+    pub bodies: &'static [&'static str],
+    pub notes: &'static str,
+}
+
+/// A starter deck shown in the template gallery.
+pub struct Starter {
+    pub name: &'static str,
+    pub summary: &'static str,
+    pub theme: &'static str,
+    pub slides: &'static [SlideSeed],
+}
+
+const fn seed(layout: &'static str, title: &'static str, bodies: &'static [&'static str], notes: &'static str) -> SlideSeed {
+    SlideSeed { layout, title, bodies, notes }
+}
+
+const STARTERS: &[Starter] = &[
+    Starter {
+        name: "Briefing",
+        summary: "A weekly check-in: what changed, what's stuck, and who does the next thing",
+        theme: "Harbor",
+        slides: &[
+            seed("title", "Weekly briefing", &["What changed, what's stuck, and what we do next"], "Open with what changed since last week."),
+            seed(
+                "titleAndContent",
+                "This week's agenda",
+                &["Shipped since last time\n\tOne concrete change\nStill open\n\tThe decision we need\nNext\n\tWho does it, and by when"],
+                "",
+            ),
+            seed("sectionHeader", "Where we are", &["A short picture before the details"], ""),
+            seed(
+                "twoContent",
+                "Done and next",
+                &[
+                    "Done\n\tThe change is in people's hands\n\tWe wrote down what we learned",
+                    "Next\n\tPick the one risk to retire\n\tSay who owns it",
+                ],
+                "",
+            ),
+            seed("title", "See you next week", &["Bring one number and one question"], ""),
+        ],
+    },
+    Starter {
+        name: "Lesson",
+        summary: "A short class that ends with the learner explaining the idea",
+        theme: "Meadow",
+        slides: &[
+            seed("title", "How a lock works", &["A short lesson for people new to the idea"], ""),
+            seed(
+                "titleAndContent",
+                "By the end",
+                &["You can say what a lock protects\n\tAnd what it does not\nYou can sketch one in three steps"],
+                "",
+            ),
+            seed("sectionHeader", "The idea", &["One metaphor, then the real thing"], ""),
+            seed(
+                "titleAndContent",
+                "Three steps",
+                &["Name the thing being shared\nDecide who may change it\nLeave it so the next person can tell"],
+                "",
+            ),
+            seed("title", "Try it", &["Explain a lock to someone who has never seen one"], ""),
+        ],
+    },
+    Starter {
+        name: "Pitch",
+        summary: "A ten-minute conversation about one promise, not a tour of features",
+        theme: "Ember",
+        slides: &[
+            seed("title", "A quieter inbox", &["Ten minutes. One promise."], ""),
+            seed(
+                "titleAndContent",
+                "The mess",
+                &[
+                    "People miss the one message that mattered\n\tIt arrived between newsletters\nThey spend the morning sorting\n\tAnd still feel behind",
+                ],
+                "",
+            ),
+            seed("sectionHeader", "A smaller promise", &["Show the one message. Hide the rest until asked."], ""),
+            seed(
+                "comparison",
+                "Today and after",
+                &[
+                    "Today",
+                    "The important note is buried\nFinding it takes a search",
+                    "After",
+                    "It sits at the top until you deal with it\nEverything else waits",
+                ],
+                "",
+            ),
+            seed("title", "The ask", &["Twenty people, two weeks, one question: did the right note surface?"], ""),
+        ],
+    },
+    Starter {
+        name: "Field Notes",
+        summary: "What an outing set out to see, and what it actually found",
+        theme: "Coral Reef",
+        slides: &[
+            seed("title", "Saturday on the ridge", &["What we went to see, and what we found"], ""),
+            seed("titleAndContent", "Plan", &["Leave at dawn\n\tCold, clear, little wind\nWalk the west path\nBe back before dusk"], ""),
+            seed("sectionHeader", "What we saw", &["Notes taken on the spot"], ""),
+            seed(
+                "twoContent",
+                "Expected and found",
+                &[
+                    "Expected\n\tA clear view from the ridge\n\tThe creek on the map",
+                    "Found\n\tLow cloud on the ridge\n\tThe creek, and a better pencil",
+                ],
+                "",
+            ),
+            seed("title", "Pack list for next time", &["Warmer gloves. A second pencil. The map that shows the creek."], ""),
+        ],
+    },
+    Starter {
+        name: "Quarterly",
+        summary: "A report meant to be read aloud in half an hour",
+        theme: "Paper",
+        slides: &[
+            seed("title", "Spring report", &["Read aloud in thirty minutes"], ""),
+            seed(
+                "titleAndContent",
+                "Headlines",
+                &["The waiting list got shorter\n\tBy the amount we promised\nTwo things slipped\n\tBoth have a new date"],
+                "",
+            ),
+            seed("sectionHeader", "The numbers", &["Only the ones that change a decision"], ""),
+            seed("titleAndContent", "What we will stop", &["The report nobody reads\nThe meeting that repeats the report"], ""),
+            seed("title", "Questions we want", &["Where should the next quarter refuse work?"], ""),
+        ],
+    },
+    Starter {
+        name: "Evening Talk",
+        summary: "A public talk the audience can check on the way home",
+        theme: "Nocturne",
+        slides: &[
+            seed("title", "Lights out", &["A talk about how cities sleep"], ""),
+            seed("titleAndContent", "Road map", &["Why the sky looks orange\nWhat a dark street is for\nOne change a block can make"], ""),
+            seed("sectionHeader", "Look up", &["The part you can check on the way home"], ""),
+            seed(
+                "titleAndContent",
+                "One change",
+                &["Shield the lamp so light goes down\n\tNot into bedroom windows\nLeave a path you can still walk"],
+                "",
+            ),
+            seed("title", "Walk home", &["Count the lamps you can see from your pillow"], ""),
+        ],
+    },
+];
+
+/// The starter gallery, in the order File › New shows it.
+pub fn starters() -> &'static [Starter] {
+    STARTERS
+}
+
+/// Starters whose name, summary, theme or a slide title contains `query` (empty matches all).
+pub fn matching(query: &str) -> Vec<&'static Starter> {
+    let q = query.trim().to_lowercase();
+    let hit = |text: &str| text.to_lowercase().contains(&q);
+    starters()
+        .iter()
+        .filter(|t| q.is_empty() || hit(t.name) || hit(t.summary) || hit(t.theme) || t.slides.iter().any(|slide| hit(slide.title)))
+        .collect()
+}
+
+pub fn find(name: &str) -> Option<&'static Starter> {
+    let name = name.trim();
+    starters().iter().find(|t| t.name.eq_ignore_ascii_case(name))
+}
+
+fn text_with_levels(text: &str) -> TextBody {
+    let mut body = TextBody::from_text(text);
+    for para in &mut body.paragraphs {
+        let tabs = para.runs.first().map(|r| r.text.chars().take_while(|c| *c == '\t').count()).unwrap_or(0);
+        if tabs > 0
+            && let Some(run) = para.runs.first_mut()
+        {
+            run.text = run.text.trim_start_matches('\t').to_string();
+            para.level = tabs.min(8) as u8;
+        }
+    }
+    body
+}
+
+/// A new presentation filled with `name`'s slides. `size` is the slide size in points.
+pub fn build(name: &str, size: Size) -> Result<Presentation> {
+    let starter = find(name).ok_or_else(|| {
+        let names = starters().iter().map(|t| t.name).collect::<Vec<_>>().join(", ");
+        bad("file.new", format!("no template `{name}`; use {names}"))
+    })?;
+    let theme = deckcraft_model::theme::builtin_themes()
+        .into_iter()
+        .find(|t| t.name.eq_ignore_ascii_case(starter.theme))
+        .ok_or_else(|| bad("file.new", format!("template `{}` names a missing theme `{}`", starter.name, starter.theme)))?;
+    let mut doc = defaults::blank_presentation(size, theme, false);
+    for seed in starter.slides {
+        let key = Value::String(seed.layout.to_string());
+        let layout = find_layout(&doc, &key, 0)
+            .ok_or_else(|| bad("file.new", format!("template `{}` uses an unknown layout `{}`", starter.name, seed.layout)))?;
+        let mut slide = defaults::new_slide(&mut doc, layout);
+        if !seed.title.is_empty()
+            && let Some(sh) = slide.shapes.iter_mut().find(|sh| sh.ph_type().is_some_and(|k| k.is_title()))
+        {
+            sh.text = Some(text_with_levels(seed.title));
+        }
+        let mut bodies = seed.bodies.iter();
+        for sh in slide.shapes.iter_mut().filter(|sh| sh.ph_type().is_some_and(|k| !k.is_title())) {
+            let Some(text) = bodies.next() else { break };
+            if !text.is_empty() {
+                sh.text = Some(text_with_levels(text));
+            }
+        }
+        if bodies.next().is_some() {
+            return Err(bad("file.new", format!("template `{}` has more text than the `{}` layout holds", starter.name, seed.layout)));
+        }
+        if !seed.notes.is_empty() {
+            slide.notes = text_with_levels(seed.notes);
+        }
+        doc.slides.push(Arc::new(slide));
+    }
+    Ok(doc)
+}
+
+#[cfg(test)]
+mod tests {
+    use serde_json::json;
+
+    use super::*;
+    use crate::Session;
+
+    fn body(doc: &Presentation, slide: usize, n: usize) -> (String, u8) {
+        let para_slide = &doc.slides[slide];
+        let text = para_slide
+            .shapes
+            .iter()
+            .filter(|sh| sh.ph_type().is_some_and(|k| !k.is_title()))
+            .nth(n)
+            .and_then(|sh| sh.text.as_ref())
+            .cloned()
+            .unwrap_or_default();
+        let level = text.paragraphs.get(1).map(|p| p.level).unwrap_or(0);
+        (text.text(), level)
+    }
+
+    #[test]
+    fn every_starter_opens_on_its_theme_and_is_a_clean_document() {
+        let mut s = Session::new();
+        for starter in starters() {
+            s.execute("file.new", &json!({"template": starter.name.to_lowercase()})).unwrap();
+            let st = s.active().unwrap();
+            assert_eq!(st.doc.masters[0].theme.name, starter.theme, "{}", starter.name);
+            assert_eq!(st.doc.slides.len(), starter.slides.len(), "{}", starter.name);
+            assert_eq!(st.doc.slides[0].title(), starter.slides[0].title, "{}", starter.name);
+            assert!(!st.is_dirty(), "{}", starter.name);
+            assert!(st.history.undo.is_empty(), "{}", starter.name);
+            assert_eq!(st.selection.slide, 0);
+        }
+        let listed = s.execute("file.templates", &json!({})).unwrap();
+        assert_eq!(listed["templates"].as_array().map(Vec::len), Some(starters().len()));
+    }
+
+    #[test]
+    fn briefing_keeps_notes_columns_and_outline_levels() {
+        let mut s = Session::new();
+        s.execute("file.new", &json!({"template": "Briefing", "size": [800.0, 450.0]})).unwrap();
+        let doc = &s.active().unwrap().doc;
+        assert_eq!(doc.slide_size.width, 800.0);
+        assert_eq!(doc.slides[0].notes_text(), "Open with what changed since last week.");
+        let (agenda, level) = body(doc, 1, 0);
+        assert!(agenda.contains("One concrete change"), "{agenda}");
+        assert_eq!(level, 1);
+        let (done, _) = body(doc, 3, 0);
+        let (next, _) = body(doc, 3, 1);
+        assert!(done.starts_with("Done"), "{done}");
+        assert!(next.starts_with("Next"), "{next}");
+    }
+
+    #[test]
+    fn pitch_comparison_fills_both_columns() {
+        let doc = build("Pitch", defaults::WIDE).unwrap();
+        assert_eq!(body(&doc, 3, 0).0, "Today");
+        assert!(body(&doc, 3, 1).0.contains("buried"));
+        assert_eq!(body(&doc, 3, 2).0, "After");
+        assert!(body(&doc, 3, 3).0.contains("top"));
+    }
+
+    #[test]
+    fn search_matches_name_summary_and_theme() {
+        assert_eq!(matching("ridge").iter().map(|t| t.name).collect::<Vec<_>>(), vec!["Field Notes"]);
+        assert_eq!(matching("nocturne").iter().map(|t| t.name).collect::<Vec<_>>(), vec!["Evening Talk"]);
+        assert_eq!(matching("").len(), starters().len());
+        assert!(matching("facet").is_empty());
+    }
+
+    #[test]
+    fn unknown_blank_and_theme_are_refused() {
+        let mut s = Session::new();
+        let unknown = s.execute("file.new", &json!({"template": "Ion"})).unwrap_err();
+        assert!(unknown.to_string().contains("Briefing"), "{unknown}");
+        let both = s.execute("file.new", &json!({"template": "Lesson", "theme": "Harbor"})).unwrap_err();
+        assert!(both.to_string().contains("not both"), "{both}");
+        let blank = s.execute("file.new", &json!({"template": "Lesson", "blank": true})).unwrap_err();
+        assert!(blank.to_string().contains("blank"), "{blank}");
+        assert!(s.active().is_none());
+    }
+
+    #[test]
+    fn a_starter_round_trips_through_pptx() {
+        let doc = build("Evening Talk", defaults::WIDE).unwrap();
+        let bytes = deckcraft_pptx::export(&doc).unwrap();
+        let back = deckcraft_pptx::import(&bytes).unwrap();
+        assert_eq!(back.slides.len(), doc.slides.len());
+        for (before, after) in doc.slides.iter().zip(back.slides.iter()) {
+            assert_eq!(after.title(), before.title());
+        }
+        assert!(back.slides[3].shapes.iter().any(|sh| sh.text.as_ref().is_some_and(|t| t.text().contains("bedroom"))));
+    }
+}
diff --git a/crates/ui-egui/src/backstage.rs b/crates/ui-egui/src/backstage.rs
index f1d0fde3..bc8a1f03 100644
--- a/crates/ui-egui/src/backstage.rs
+++ b/crates/ui-egui/src/backstage.rs
@@ -497,15 +497,14 @@ fn tile(ui: &mut Ui, label: &str, theme: Option<&deckcraft_model::Theme>, big: b
 }
 
 /// The built-in themes and the sample deck, filtered by `query` (after a blank presentation when
-/// `blank`); at most `limit` theme tiles.
-fn new_tiles(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize, blank: bool) {
+/// `blank`); at most `limit` theme tiles. False when nothing matched.
+fn new_tiles(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize, blank: bool) -> bool {
     let q = query.trim().to_lowercase();
     let themes: Vec<deckcraft_model::Theme> =
         deckcraft_model::theme::builtin_themes().into_iter().filter(|th| q.is_empty() || th.name.to_lowercase().contains(&q)).collect();
     let sample = q.is_empty() || "sample deck northern lights".contains(&q);
     if themes.is_empty() && !sample {
-        dim(ui, &format!("No themes match “{}”.", query.trim()));
-        return;
+        return false;
     }
     ui.horizontal_wrapped(|ui| {
         ui.spacing_mut().item_spacing = vec2(10.0, 10.0);
@@ -531,6 +530,25 @@ fn new_tiles(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize, blank:
             }
         }
     });
+    true
+}
+
+/// Starter decks whose name, summary, theme or a slide title matches `query`, at most `limit` tiles.
+fn template_tiles(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize) -> bool {
+    let list = deckcraft_engine::templates::matching(query);
+    if list.is_empty() {
+        return false;
+    }
+    ui.horizontal_wrapped(|ui| {
+        ui.spacing_mut().item_spacing = vec2(10.0, 10.0);
+        for starter in list.into_iter().take(limit) {
+            let theme = deckcraft_model::theme::builtin_themes().into_iter().find(|th| th.name == starter.theme);
+            if tile(ui, starter.name, theme.as_ref(), false).on_hover_text(starter.summary).clicked() {
+                let _ = app.run("file.new", json!({"template": starter.name}));
+            }
+        }
+    });
+    true
 }
 
 /// File name and folder of a recent path, split as text (nothing on disk is read).
@@ -648,6 +666,17 @@ fn home(app: &mut SlideApp, ui: &mut Ui, bs: &mut Backstage, out: &mut Outcome)
     ui.add_space(6.0);
     new_tiles(app, ui, "", 5, true);
     ui.add_space(22.0);
+    ui.horizontal(|ui| {
+        ui.label(RichText::new("Templates").font(theme::bold(16.0)).color(t.text));
+        ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
+            if arrow_link(ui, "More templates") {
+                out.page = Some(Page::New);
+            }
+        });
+    });
+    ui.add_space(6.0);
+    template_tiles(app, ui, "", 3);
+    ui.add_space(22.0);
     ui.horizontal(|ui| {
         ui.label(RichText::new("Recent").font(theme::bold(16.0)).color(t.text));
         ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
@@ -668,7 +697,7 @@ fn home(app: &mut SlideApp, ui: &mut Ui, bs: &mut Backstage, out: &mut Outcome)
     ui.hyperlink_to("Join the ArtCraft community on Discord", deckcraft_engine::links::DISCORD);
 }
 
-/// New: a blank presentation, then every theme with a search box.
+/// New: a blank presentation, then every theme and starter template, with a search box.
 fn new_page(app: &mut SlideApp, ui: &mut Ui, bs: &mut Backstage) {
     let t = Tokens::get(ui.ctx());
     if tile(ui, "Blank Presentation", None, true).clicked() {
@@ -679,10 +708,20 @@ fn new_page(app: &mut SlideApp, ui: &mut Ui, bs: &mut Backstage) {
     let (r, _) = ui.allocate_exact_size(vec2(w, 1.0), Sense::hover());
     ui.painter().line_segment([r.left_center(), r.right_center()], Stroke::new(1.0, t.separator));
     ui.add_space(14.0);
-    search(ui, &mut bs.query, "Search for themes", 380.0);
+    search(ui, &mut bs.query, "Search for themes and templates", 380.0);
     ui.add_space(14.0);
     let q = bs.query.clone();
-    new_tiles(app, ui, &q, usize::MAX, false);
+    let themes = new_tiles(app, ui, &q, usize::MAX, false);
+    let templates = if q.trim().is_empty() || !deckcraft_engine::templates::matching(&q).is_empty() {
+        ui.add_space(18.0);
+        heading(ui, "Templates");
+        template_tiles(app, ui, &q, usize::MAX)
+    } else {
+        false
+    };
+    if !themes && !templates {
+        dim(ui, &format!("No themes or templates match “{}”.", q.trim()));
+    }
 }
 
 /// Open: Recent and Browse on the left; the recent presentations (with a search box) on the right.
diff --git a/crates/ui-egui/src/backstage_tests.rs b/crates/ui-egui/src/backstage_tests.rs
index 115d782f..5fb6a2e3 100644
--- a/crates/ui-egui/src/backstage_tests.rs
+++ b/crates/ui-egui/src/backstage_tests.rs
@@ -179,6 +179,21 @@ fn every_page_renders() {
     assert!(h.state_mut().run("app.backstage", json!({"page": "share"})).is_err(), "Share (cloud) isn't offered");
 }
 
+/// A starter template from File › New opens its deck and leaves the File tab.
+#[test]
+fn new_template_opens_a_starter_deck() {
+    let mut h = harness(new_app());
+    h.state_mut().run("app.backstage", json!({"page": "new"})).unwrap();
+    h.run_steps(3);
+    h.get_by_label("Briefing").click();
+    h.run_steps(3);
+    let doc = &h.state().session.active().unwrap().doc;
+    assert_eq!(doc.masters[0].theme.name, "Harbor");
+    assert_eq!(doc.slides[0].title(), "Weekly briefing");
+    assert_eq!(doc.slides.len(), 5);
+    assert!(h.state().backstage.is_none(), "the starter deck shows");
+}
+
 /// New and Home create presentations, which leaves the File tab.
 #[test]
 fn new_creates_a_presentation() {
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..bb95531e 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (six original starter decks on File › New; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -242,8 +242,11 @@ Detail in [localization-parity.md](localization-parity.md).
 
 ## Ecosystem
 
-- **8 original themes, no template gallery.** PowerPoint offers dozens of designs online and
-  offline. 8–14 h for a larger original set (asset policy: our own designs only).
+- **Six original starter decks; PowerPoint's large template gallery remains.** File › New and the
+  start screen offer Briefing, Lesson, Pitch, Field Notes, Quarterly and Evening Talk
+  (`file.new {template}`), each a few slides on one of our themes. Dozens of further offline
+  designs, and any online gallery, are still absent. 4–8 h for a larger original set (asset policy:
+  our own designs only).
 - **No add-ins or VBA.** Out of scope by policy; MCP/CLI automation is the alternative.
 
 ## AI features
@@ -256,6 +259,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | File › New has six original starter decks; a large template gallery is still open |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..c7e7b66e 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (six original starter decks; the large template gallery stays after beta; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -61,8 +61,8 @@ reference renders, a Windows tester with the affected GPUs, native speakers to r
 SmartArt editing, chartex chart types, the remaining animation effects and motion paths, Notes and
 Handout masters, edit points, text warp and 3-D, proofing dictionaries, Zoom, recording, video and
 GIF export, legacy `.ppt` import and `.odp` (owner decision), GPU rasterization and hardware video
-decode, the other 21 languages with RTL mirroring, a larger original template gallery, and local AI
-features (owner decision on models). Itemized with hours in [gaps.md](gaps.md).
+decode, the other 21 languages with RTL mirroring, a larger template gallery (six original starters
+ship), and local AI features (owner decision on models). Itemized with hours in [gaps.md](gaps.md).
 
 ## Milestones
 
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | After beta: six original starter decks exist; a larger template gallery remains |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..fc02dacd 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (six original starter decks; ecosystem stays ~25% until the gallery is large; previous: minor, hours to ~95% per audience added; ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -72,7 +72,7 @@ The weights are what those users actually depend on, written down so the total c
 | Hardware | 5% | ~40% | 25–45 | [hardware-parity.md](hardware-parity.md) | GPU-composited window (wgpu), but CPU slide raster, software-only video decode, presenter view not placed on the second display, no pen pressure, no pinch zoom |
 | Platforms | 5% | ~80% | 5–10 | [ROADMAP.md](../ROADMAP.md) | Ahead in reach: macOS, Windows x64/x86/arm64, Linux (5 formats), FreeBSD and the web, all from one release workflow. Held back by the Windows GPU crashes and Linux/Windows clipboard gaps |
 | Localization | 5% | ~8% | 55–90 + native review | [localization-parity.md](localization-parity.md) | English only; no string catalog. PowerPoint for Mac ships 26 languages. Bidi and Arabic shaping in slide text exist |
-| Ecosystem (templates, add-ins) | 3% | ~25% | 10–20 | [gaps.md](gaps.md) | 8 original themes vs PowerPoint's large template gallery; no add-ins or VBA (out of scope by policy) |
+| Ecosystem (templates, add-ins) | 3% | ~25% | 10–20 | [gaps.md](gaps.md) | 8 original themes and 6 original starter decks; PowerPoint's large template gallery remains; no add-ins or VBA (out of scope by policy) |
 | AI features | 2% | ~10% | 20–40 (owner decision on models) | [gaps.md](gaps.md) | No Designer, Copilot, Speaker Coach, live subtitles or Translate (all Microsoft cloud services). Agents drive every command over MCP instead |
 | **Total** | 100% | **~55%** (Σ weight × ready = 55.3) | **~365–650** | | |
 | Automation (✱, not weighted) | | ahead | 0 | [mcp.md](mcp.md), [control-protocol.md](control-protocol.md) | Every command is scriptable from the CLI, a JSON control channel and MCP, headless or against the running app; PowerPoint for Mac has AppleScript and VBA only |
@@ -211,7 +211,8 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   inheritance (slide → layout → master → theme), sections, notes, comments, custom shows,
   header/footer fields, embedded media, unlimited undo on shared slide snapshots.
 - **Themes:** 8 original themes with colour and font schemes, custom colours and fonts,
-  backgrounds (solid, gradient, picture, pattern), slide size presets.
+  backgrounds (solid, gradient, picture, pattern), slide size presets. File › New also offers 6
+  original starter decks (Briefing, Lesson, Pitch, Field Notes, Quarterly, Evening Talk).
 - **Shapes:** ~180 preset geometries with adjustment handles, text boxes, pictures (crop,
   corrections, animated GIFs that play and pause), tables with styles, charts (column, bar, line,
   area, pie, doughnut, scatter and more), basic SmartArt, groups, connectors glued to sites,
@@ -276,6 +277,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Ecosystem evidence: six original starter decks. The dimension stays ~25% because PowerPoint's large gallery is still absent |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..898396b0 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -2,7 +2,7 @@
 
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-14 · **Change:** minor (File › New starter decks; previous: minor, text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -41,8 +41,8 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 
 | Page | PowerPoint | DeckCraft |
 |---|---|---|
-| Home | Prompt box (Copilot), New row of themes with More themes, Recent / Favorites / Shared with Me with a file search, More presentations | DeckCraft's mark, Blank Presentation and the first themes with More themes →, Recent with a file search and More presentations → (to Open). No Copilot prompt, Favorites or Shared with Me |
-| New | Blank Presentation, template search with suggested searches, gallery of online templates and themes | Blank Presentation, search box, the built-in themes and the sample deck (`file.new {theme}`). No online templates |
+| Home | Prompt box (Copilot), New row of themes with More themes, Recent / Favorites / Shared with Me with a file search, More presentations | DeckCraft's mark, Blank Presentation and the first themes with More themes →, the first starter decks with More templates →, Recent with a file search and More presentations → (to Open). No Copilot prompt, Favorites or Shared with Me |
+| New | Blank Presentation, template search with suggested searches, gallery of online templates and themes | Blank Presentation, search box, the built-in themes, six original starter decks (`file.new {template}`) and the sample deck (`file.new {theme}`). No online templates |
 | Open | Recent, Shared with Me, OneDrive, This PC, Add a Place, Browse; Presentations / Folders; Recover Unsaved Presentations | Recent and Browse (`app.openDialog`), recent presentations with a search box (`file.open`), Recover Unsaved Presentations (`file.recovery.open`). No cloud places or Folders tab |
 | Info | Name and path, Upload / Share / Copy path / Open file location; Protect, Inspect, Version History, Manage Presentation; Properties, Related Dates, Related People | Name and path, Copy path, Open file location; Inspect Presentation (Accessibility Checker), Manage Presentation (Revert); Size, Slides, Hidden slides and editable Title, Subject, Tags, Categories, Company, Comments, Author (`file.info`, `file.properties`). No Protect, Version History or dates |
 | Save | Saves; a presentation never saved goes to Save As | Same (`file.save`) |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | File › Home and New show six original starter decks; online templates are still absent |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From b3420a0b04f078d97f56f15e7e8a012d69579a62 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:16:09 +0300
Subject: [PATCH 213/376] Charts: multi-level treemaps and sunbursts; inclusive
 box quartiles

Read, keep and write every cx:lvl of a chartEx category dimension,
build a category tree from runs of parent labels, and draw treemaps as
nested squarified groups with banners and sunbursts as one ring per
level. Box & whisker honours quartileMethod="inclusive" (QUARTILE.INC)
on import, render, save and the chart.options command.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/insert.rs |  19 +++-
 crates/model/src/chart.rs       | 140 +++++++++++++++++++++++++++-
 crates/pptx/src/read/chartex.rs |   8 ++
 crates/pptx/src/write/chart.rs  |   5 +-
 crates/pptx/tests/roundtrip.rs  |  37 ++++++++
 crates/render/src/chart.rs      |   3 +-
 crates/render/src/chartex.rs    | 160 +++++++++++++++++++++++++++++++-
 crates/render/src/tests.rs      |  26 ++++++
 docs/file-format-parity.md      |   2 +-
 docs/gaps.md                    |   8 +-
 10 files changed, 394 insertions(+), 14 deletions(-)

diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 810a96e2..8a0a7d28 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -64,7 +64,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Edit Data",
             ["Chart Design", "Data"],
             None,
-            "{categories?: [..], series?: [{name, values}], id?}",
+            "{categories?: [..], levels?: [[..]] (outer category levels, innermost first), series?: [{name, values}], id?}",
             has_selection,
             chart_data
         ),
@@ -73,7 +73,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Chart Elements",
             ["Chart Design", "Chart Layouts"],
             None,
-            "{title?: string|null, legend?: b|t|l|r|null, dataLabels?: bool, gridlines?: bool, palette?, binCount?: n|null, binSize?: n|null, subtotals?: [point index], id?}",
+            "{title?: string|null, legend?: b|t|l|r|null, dataLabels?: bool, gridlines?: bool, palette?, binCount?: n|null, binSize?: n|null, subtotals?: [point index], quartiles?: exclusive|inclusive, id?}",
             has_selection,
             chart_options
         ),
@@ -669,10 +669,21 @@ fn chart_data(s: &mut Session, p: &Value) -> Result<Value> {
             })
             .collect()
     });
+    let levels: Option<Vec<Vec<String>>> = p.get("levels").and_then(Value::as_array).map(|a| {
+        a.iter()
+            .take(deckcraft_model::chart::MAX_LEVELS)
+            .map(|l| {
+                l.as_array().map(|v| v.iter().map(|x| x.as_str().map(String::from).unwrap_or_else(|| x.to_string())).collect()).unwrap_or_default()
+            })
+            .collect()
+    });
     with_chart(s, p, "chart.data", |c| {
         if let Some(cs) = &cats {
             c.categories = cs.clone();
         }
+        if let Some(l) = &levels {
+            c.category_levels = l.clone();
+        }
         if let Some(se) = &series {
             // Keep series formatting by position.
             let old = std::mem::take(&mut c.series);
@@ -722,6 +733,10 @@ fn chart_options(s: &mut Session, p: &Value) -> Result<Value> {
             t.dedup();
             c.subtotals = t;
         }
+        if let Some(q) = p.get("quartiles").and_then(Value::as_str) {
+            c.inclusive_quartiles = q.eq_ignore_ascii_case("inclusive");
+            c.raw = None;
+        }
         if bin_count.is_some() || bin_size.is_some() || subtotals.is_some() {
             c.raw = None;
         }
diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index 583a447b..54e28dcd 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -206,6 +206,13 @@ pub struct Chart {
     /// the running total, instead of floating.
     #[serde(skip_serializing_if = "Vec::is_empty")]
     pub subtotals: Vec<usize>,
+    /// Outer category levels of a treemap or sunburst, innermost first (the leaves' parents,
+    /// then theirs…), each with one label per category. A blank label continues the one above it.
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub category_levels: Vec<Vec<String>>,
+    /// Box and whisker quartiles by the inclusive method (QUARTILE.INC) instead of exclusive.
+    #[serde(skip_serializing_if = "std::ops::Not::not")]
+    pub inclusive_quartiles: bool,
     /// A histogram's bin count (`cx:binCount`); with neither this nor `bin_size` the bins are
     /// automatic (Scott's rule, as Excel does).
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -253,6 +260,8 @@ impl Default for Chart {
             y2_hidden: false,
             lang: None,
             subtotals: vec![],
+            category_levels: vec![],
+            inclusive_quartiles: false,
             bin_count: None,
             bin_size: None,
             raw: None,
@@ -266,6 +275,15 @@ impl Chart {
         let cats = ["Q1", "Q2", "Q3", "Q4"];
         let data = [[4.2, 2.6, 2.1], [2.8, 4.1, 2.4], [3.6, 1.9, 3.3], [4.7, 3.0, 5.1]];
         let mut c = Chart { kind, categories: cats.iter().map(|s| s.to_string()).collect(), ..Default::default() };
+        if matches!(kind, ChartType::Treemap | ChartType::Sunburst) {
+            // A two-level hierarchy: months inside quarters.
+            c.categories = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug"].iter().map(|s| s.to_string()).collect();
+            c.category_levels = vec![["Q1", "Q1", "Q1", "Q2", "Q2", "Q2", "Q3", "Q3"].iter().map(|s| s.to_string()).collect()];
+            let v = [4.2, 2.8, 3.6, 4.7, 2.6, 4.1, 1.9, 3.0];
+            c.series.push(Series { name: "Series 1".into(), values: v.iter().map(|x| Some(*x)).collect(), ..Default::default() });
+            c.vary_colors = true;
+            return c;
+        }
         if matches!(kind, ChartType::Histogram | ChartType::Pareto | ChartType::BoxWhisker) {
             // These plot raw observations: a histogram bins one series, a box chart summarises
             // each category's points.
@@ -743,7 +761,7 @@ impl Chart {
                             .filter_map(|(_, v)| *v)
                             .filter(|v| v.is_finite())
                             .collect();
-                        box_stats(pts)
+                        box_stats_by(pts, self.inclusive_quartiles)
                     })
                     .collect()
             })
@@ -763,13 +781,29 @@ fn quantile_exc(v: &[f64], p: f64) -> f64 {
     a + (b - a) * frac
 }
 
-/// The summary of one group's points.
-pub fn box_stats(mut pts: Vec<f64>) -> Option<BoxStats> {
+/// Excel's QUARTILE.INC position `p·(n-1)` (0-based) on sorted data.
+fn quantile_inc(v: &[f64], p: f64) -> f64 {
+    let n = v.len();
+    let pos = (p * (n as f64 - 1.0)).clamp(0.0, (n - 1) as f64);
+    let i = pos.floor() as usize;
+    let a = v[i.min(n - 1)];
+    let b = v[(i + 1).min(n - 1)];
+    a + (b - a) * (pos - i as f64)
+}
+
+/// The summary of one group's points, with exclusive quartiles.
+pub fn box_stats(pts: Vec<f64>) -> Option<BoxStats> {
+    box_stats_by(pts, false)
+}
+
+/// The summary of one group's points; `inclusive` picks QUARTILE.INC over QUARTILE.EXC.
+pub fn box_stats_by(mut pts: Vec<f64>, inclusive: bool) -> Option<BoxStats> {
     if pts.is_empty() {
         return None;
     }
     pts.sort_by(f64::total_cmp);
-    let (q1, median, q3) = (quantile_exc(&pts, 0.25), quantile_exc(&pts, 0.5), quantile_exc(&pts, 0.75));
+    let q = |p: f64| if inclusive { quantile_inc(&pts, p) } else { quantile_exc(&pts, p) };
+    let (q1, median, q3) = (q(0.25), q(0.5), q(0.75));
     let iqr = q3 - q1;
     let (lo_fence, hi_fence) = (q1 - 1.5 * iqr, q3 + 1.5 * iqr);
     let inside: Vec<f64> = pts.iter().copied().filter(|v| *v >= lo_fence && *v <= hi_fence).collect();
@@ -780,6 +814,75 @@ pub fn box_stats(mut pts: Vec<f64>) -> Option<BoxStats> {
     Some(BoxStats { low, q1, median, q3, high, mean, outliers })
 }
 
+/// A node of a treemap or sunburst hierarchy: its label, the total of the leaves under it, and
+/// its children (none for a leaf, which names its category index).
+#[derive(Clone, Debug, PartialEq)]
+pub struct TreeNode {
+    pub name: String,
+    pub value: f64,
+    pub leaf: Option<usize>,
+    pub children: Vec<TreeNode>,
+}
+
+/// Levels of hierarchy a chart may have (a hostile file cannot nest deeper).
+pub const MAX_LEVELS: usize = 16;
+
+impl Chart {
+    /// The first series as a hierarchy: top-level nodes, each holding the consecutive
+    /// categories that share its label, down to the leaves. Without outer levels every
+    /// category is a top-level leaf. Negative and missing values count as zero.
+    pub fn category_tree(&self) -> Vec<TreeNode> {
+        let Some(s) = self.series.first() else { return vec![] };
+        let n = self.categories.len().max(s.values.len());
+        let levels: Vec<&Vec<String>> = self.category_levels.iter().take(MAX_LEVELS).collect();
+        // Each leaf's path from the top level down, blanks filled from the row above.
+        let mut last: Vec<String> = vec![String::new(); levels.len()];
+        let paths: Vec<Vec<String>> = (0..n)
+            .map(|i| {
+                let mut path = Vec::with_capacity(levels.len() + 1);
+                for (d, lv) in levels.iter().enumerate().rev() {
+                    let l = lv.get(i).map(|x| x.trim()).unwrap_or("");
+                    if !l.is_empty() {
+                        last[d] = l.to_string();
+                        // A new outer label starts fresh inner groups.
+                        for inner in last.iter_mut().take(d) {
+                            inner.clear();
+                        }
+                    }
+                    path.push(last[d].clone());
+                }
+                path.push(self.categories.get(i).cloned().unwrap_or_default());
+                path
+            })
+            .collect();
+        let value = |i: usize| s.values.get(i).copied().flatten().filter(|v| v.is_finite()).unwrap_or(0.0).max(0.0);
+        fn build(rows: &[(usize, &[String])], value: &dyn Fn(usize) -> f64) -> Vec<TreeNode> {
+            let mut out: Vec<TreeNode> = Vec::new();
+            let mut i = 0;
+            while i < rows.len() {
+                let (idx, path) = rows[i];
+                if path.len() <= 1 {
+                    out.push(TreeNode { name: path.first().cloned().unwrap_or_default(), value: value(idx), leaf: Some(idx), children: vec![] });
+                    i += 1;
+                    continue;
+                }
+                let head = &path[0];
+                let mut j = i;
+                while j < rows.len() && rows[j].1.len() > 1 && &rows[j].1[0] == head {
+                    j += 1;
+                }
+                let sub: Vec<(usize, &[String])> = rows[i..j].iter().map(|(k, p)| (*k, &p[1..])).collect();
+                let children = build(&sub, value);
+                out.push(TreeNode { name: head.clone(), value: children.iter().map(|c| c.value).sum(), leaf: None, children });
+                i = j;
+            }
+            out
+        }
+        let rows: Vec<(usize, &[String])> = paths.iter().enumerate().map(|(i, p)| (i, p.as_slice())).collect();
+        build(&rows, &value)
+    }
+}
+
 #[cfg(test)]
 mod chartex_tests {
     use super::*;
@@ -840,6 +943,35 @@ mod chartex_tests {
         assert_eq!((one.low, one.q1, one.median, one.q3, one.high), (5.0, 5.0, 5.0, 5.0, 5.0));
     }
 
+    #[test]
+    fn inclusive_quartiles_follow_quartile_inc() {
+        let b = box_stats_by(vec![1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 100.0], true).unwrap();
+        // QUARTILE.INC on 8 points: positions 1.75, 3.5, 5.25 (0-based).
+        assert_eq!((b.q1, b.median, b.q3), (2.75, 4.5, 6.25));
+    }
+
+    #[test]
+    fn category_tree_groups_runs_and_fills_blank_parents() {
+        let mut c = Chart::sample(ChartType::Treemap);
+        let t = c.category_tree();
+        assert_eq!(t.iter().map(|n| n.name.as_str()).collect::<Vec<_>>(), ["Q1", "Q2", "Q3"]);
+        assert_eq!(t[0].children.len(), 3);
+        assert_eq!(t[0].children[1].leaf, Some(1));
+        assert!((t[0].value - (4.2 + 2.8 + 3.6)).abs() < 1e-9);
+        // Blank parents continue the label above; two outer levels nest.
+        c.category_levels = vec![
+            vec!["a".into(), "".into(), "b".into(), "".into(), "c".into(), "".into(), "".into(), "".into()],
+            vec!["H1".into(), "".into(), "".into(), "".into(), "H2".into(), "".into(), "".into(), "".into()],
+        ];
+        let t = c.category_tree();
+        assert_eq!(t.len(), 2);
+        assert_eq!(t[0].children.iter().map(|n| n.name.as_str()).collect::<Vec<_>>(), ["a", "b"]);
+        assert_eq!(t[1].children[0].children.len(), 4);
+        // No levels: every category is a leaf.
+        c.category_levels.clear();
+        assert!(c.category_tree().iter().all(|n| n.leaf.is_some()));
+    }
+
     #[test]
     fn box_groups_follow_category_labels() {
         let c = Chart::sample(ChartType::BoxWhisker);
diff --git a/crates/pptx/src/read/chartex.rs b/crates/pptx/src/read/chartex.rs
index 5c6e2f77..339d26c3 100644
--- a/crates/pptx/src/read/chartex.rs
+++ b/crates/pptx/src/read/chartex.rs
@@ -14,6 +14,8 @@ const MAX_POINTS: usize = 100_000;
 #[derive(Default)]
 struct Data {
     categories: Vec<String>,
+    /// Outer category levels, innermost first.
+    levels: Vec<Vec<String>>,
     numbers: HashMap<String, (Vec<Option<f64>>, Option<String>)>,
 }
 
@@ -45,6 +47,8 @@ fn data(d: &El) -> Data {
         if dim.is("strDim") || (dim.is("numDim") && ty == "cat") {
             if ty == "cat" || out.categories.is_empty() {
                 out.categories = points(lvl);
+                // Further levels are the hierarchy's parents, innermost first.
+                out.levels = dim.children_named("lvl").skip(1).take(deckcraft_model::chart::MAX_LEVELS).map(points).collect();
             }
         } else if dim.is("numDim") {
             let vals = points(lvl).into_iter().map(|s| s.trim().parse::<f64>().ok().filter(|v| v.is_finite())).collect();
@@ -109,6 +113,10 @@ pub(crate) fn chartex_from(root: &El) -> Option<Chart> {
             ["val", "size"].iter().find_map(|t| d.numbers.get(*t)).or_else(|| d.numbers.values().next()).cloned().unwrap_or_default();
         if c.categories.is_empty() {
             c.categories = d.categories.clone();
+            c.category_levels = d.levels.clone();
+        }
+        if let Some(st) = s.child("layoutPr").and_then(|l| l.child("statistics")) {
+            c.inclusive_quartiles = st.attr("quartileMethod") == Some("inclusive");
         }
         if let Some(b) = s.child("layoutPr").and_then(|l| l.child("binning")) {
             c.bin_count = b.child("binCount").and_then(|n| n.u32("val")).filter(|n| *n > 0);
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 172acf49..e0e3743e 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -546,6 +546,9 @@ pub fn build_chartex(c: &Chart) -> Vec<u8> {
         if !c.categories.is_empty() {
             w.open("cx:strDim", A::new().a("type", "cat"));
             cx_level(&mut w, &c.categories, None);
+            for lv in &c.category_levels {
+                cx_level(&mut w, lv, None);
+            }
             w.close("cx:strDim");
         }
         let ty = if matches!(c.kind, ChartType::Treemap | ChartType::Sunburst) { "size" } else { "val" };
@@ -606,7 +609,7 @@ pub fn build_chartex(c: &Chart) -> Vec<u8> {
             ChartType::BoxWhisker => {
                 w.open0("cx:layoutPr");
                 w.empty("cx:visibility", A::new().a("meanLine", "0").a("meanMarker", "1").a("nonoutliers", "0").a("outliers", "1"));
-                w.empty("cx:statistics", A::new().a("quartileMethod", "exclusive"));
+                w.empty("cx:statistics", A::new().a("quartileMethod", if c.inclusive_quartiles { "inclusive" } else { "exclusive" }));
                 w.close("cx:layoutPr");
             }
             _ => {}
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index addcb39f..ae144dd0 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -1160,3 +1160,40 @@ fn chartex_new_charts_save_as_their_own_type() {
         assert_eq!((after.bin_count, after.subtotals.clone()), (before.bin_count, before.subtotals.clone()), "{ty}");
     }
 }
+
+/// A two-level treemap keeps its parent level, and a box chart its inclusive quartiles, through
+/// a save and reopen.
+#[test]
+fn chartex_levels_and_quartiles_round_trip() {
+    use deckcraft_engine::Session;
+    let chart = |d: &Presentation| -> Option<Chart> {
+        d.slides.iter().flat_map(|s| s.shapes.iter()).find_map(|sh| match &sh.kind {
+            ShapeKind::Chart(c) => Some((**c).clone()),
+            _ => None,
+        })
+    };
+    for ty in ["treemap", "sunburst", "boxwhisker"] {
+        let mut s = Session::with_new();
+        s.execute("slide.new", &serde_json::json!({"layout": "blank"})).unwrap();
+        s.execute("insert.chart", &serde_json::json!({"type": ty})).unwrap();
+        let id = s.doc().unwrap().selection.shapes[0].0;
+        if ty == "boxwhisker" {
+            s.execute("chart.options", &serde_json::json!({"id": id, "quartiles": "inclusive"})).unwrap();
+        } else {
+            s.execute(
+                "chart.data",
+                &serde_json::json!({"id": id, "levels": [["Q1", "", "", "Q2", "", "", "Q3", ""], ["H1", "", "", "", "", "", "H2", ""]]}),
+            )
+            .unwrap();
+        }
+        let before = chart(&s.doc().unwrap().doc).unwrap();
+        let out = deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap();
+        let after = chart(&deckcraft_pptx::import(&out).unwrap()).unwrap();
+        assert_eq!(after.category_levels, before.category_levels, "{ty}");
+        assert_eq!(after.inclusive_quartiles, before.inclusive_quartiles, "{ty}");
+        assert_eq!(after.category_tree(), before.category_tree(), "{ty}");
+        // Unchanged since import, the part is written back as read.
+        let again = deckcraft_pptx::export(&deckcraft_pptx::import(&out).unwrap()).unwrap();
+        assert_eq!(chart(&deckcraft_pptx::import(&again).unwrap()).unwrap().category_levels, before.category_levels, "{ty}");
+    }
+}
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index 82d1116d..5cfeb691 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -178,7 +178,8 @@ fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64,
     let legend_items: Vec<(String, Rgba)> = if waterfall {
         ["Increase", "Decrease", "Total"].iter().enumerate().map(|(i, n)| (n.to_string(), series_color(rctx, c, i))).collect()
     } else if matches!(c.kind, ChartType::Treemap | ChartType::Sunburst) {
-        c.categories.iter().enumerate().map(|(i, n)| (n.clone(), series_color(rctx, c, i))).collect()
+        // A hierarchy's legend names its top-level groups.
+        c.category_tree().iter().enumerate().map(|(i, n)| (n.name.clone(), series_color(rctx, c, i))).collect()
     } else if c.kind == ChartType::Funnel {
         vec![]
     } else if pie {
diff --git a/crates/render/src/chartex.rs b/crates/render/src/chartex.rs
index 04d0ab1f..9e988351 100644
--- a/crates/render/src/chartex.rs
+++ b/crates/render/src/chartex.rs
@@ -3,7 +3,7 @@
 //! the column chart of their bins).
 
 use deckcraft_color::Rgba;
-use deckcraft_model::chart::{BoxStats, Chart, ChartType};
+use deckcraft_model::chart::{BoxStats, Chart, ChartType, TreeNode};
 use deckcraft_model::resolve::Ctx;
 use deckcraft_model::text::{Align, Anchor};
 use kurbo::{Affine, BezPath, Point, Rect, Shape as _};
@@ -23,7 +23,9 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rec
     let labels = c.data_labels || c.kind == ChartType::Funnel;
     match c.kind {
         ChartType::Funnel => funnel(ctx, rctx, c, m, area, base, text_col, &vals, &value_label),
+        ChartType::Treemap if !c.category_levels.is_empty() => tree_treemap(ctx, rctx, c, m, area, base, labels.then_some(&value_label)),
         ChartType::Treemap => treemap(ctx, rctx, c, m, area, base, &vals, labels.then_some(&value_label)),
+        _ if !c.category_levels.is_empty() => tree_sunburst(ctx, rctx, c, m, area, base),
         _ => sunburst(ctx, rctx, c, m, area, base, &vals),
     }
 }
@@ -189,6 +191,162 @@ fn sunburst(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rec
     }
 }
 
+/// `col` mixed toward white by `k` (0..1): deeper hierarchy levels are lighter.
+fn lighten(col: Rgba, k: f64) -> Rgba {
+    let k = k.clamp(0.0, 0.8);
+    let f = |v: u8| (f64::from(v) + (255.0 - f64::from(v)) * k).round() as u8;
+    Rgba::rgb(f(col.r), f(col.g), f(col.b))
+}
+
+/// A multi-level treemap: top-level groups squarified by their totals, each with its label in
+/// a banner along the top, and their children squarified inside, down to the leaves. A group
+/// and everything in it take the group's colour.
+#[allow(clippy::too_many_arguments)]
+fn tree_treemap(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rect, base: f64, value_label: Option<&dyn Fn(f64) -> String>) {
+    let tree = c.category_tree();
+    #[allow(clippy::too_many_arguments)]
+    fn place(
+        ctx: &mut RenderContext,
+        rctx: &Ctx,
+        m: Affine,
+        nodes: &[TreeNode],
+        r: Rect,
+        base: f64,
+        col: &dyn Fn(usize) -> Rgba,
+        value_label: Option<&dyn Fn(f64) -> String>,
+        depth: usize,
+    ) {
+        let vals: Vec<f64> = nodes.iter().map(|n| n.value).collect();
+        for (i, (n, t)) in nodes.iter().zip(squarify(&vals, r)).enumerate() {
+            if t.area() <= 0.0 {
+                continue;
+            }
+            let fill = col(i);
+            if n.children.is_empty() {
+                ctx.set_transform(m);
+                ctx.set_paint(color(fill, 1.0));
+                ctx.fill_rect(&t);
+                ctx.set_paint(color(Rgba::WHITE, 1.0));
+                ctx.set_stroke(kurbo::Stroke::new(1.0));
+                ctx.stroke_path(&t.to_path(0.1));
+                let mut text = n.name.clone();
+                if let Some(f) = value_label {
+                    text = format!("{text}\n{}", f(n.value));
+                }
+                let inner = t.inset(-base * 0.3);
+                if inner.width() > base && inner.height() > base {
+                    label(ctx, rctx, m, &text, inner, base * 0.9, Align::Left, Anchor::Top, Rgba::WHITE, false);
+                }
+                continue;
+            }
+            // A group: its banner, then its children below it.
+            let banner = (base * 1.5).min(t.height() * 0.3);
+            ctx.set_transform(m);
+            ctx.set_paint(color(fill, 1.0));
+            ctx.fill_rect(&t);
+            if t.width() > base * 2.0 && banner > base * 0.8 {
+                let head = Rect::new(t.x0 + base * 0.3, t.y0, t.x1 - base * 0.3, t.y0 + banner);
+                label(ctx, rctx, m, &n.name, head, base, Align::Left, Anchor::Middle, Rgba::WHITE, true);
+            }
+            let inner = Rect::new(t.x0 + 1.0, t.y0 + banner, t.x1 - 1.0, t.y1 - 1.0);
+            let k = lighten(fill, 0.12 * (depth + 1) as f64);
+            place(ctx, rctx, m, &n.children, inner, base, &|_| k, value_label, depth + 1);
+            ctx.set_transform(m);
+            ctx.set_paint(color(Rgba::WHITE, 1.0));
+            ctx.set_stroke(kurbo::Stroke::new(2.0));
+            ctx.stroke_path(&t.to_path(0.1));
+        }
+    }
+    place(ctx, rctx, m, &tree, area, base, &|i| series_color(rctx, c, i), value_label, 0);
+}
+
+/// A multi-level sunburst: the top level as the inner ring, each deeper level in the next ring
+/// out within its parent's angle, coloured by top-level group and lighter further out.
+fn tree_sunburst(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rect, base: f64) {
+    let tree = c.category_tree();
+    fn depth(n: &[TreeNode]) -> usize {
+        n.iter().map(|c| 1 + depth(&c.children)).max().unwrap_or(0)
+    }
+    let levels = depth(&tree).max(1);
+    let total: f64 = tree.iter().map(|n| n.value).sum();
+    if total <= 0.0 {
+        return;
+    }
+    let r = area.width().min(area.height()) / 2.0 * 0.95;
+    let hole = r * 0.2;
+    let ring = (r - hole) / levels as f64;
+    let cen = area.center();
+    #[allow(clippy::too_many_arguments)]
+    fn ring_of(
+        ctx: &mut RenderContext,
+        rctx: &Ctx,
+        m: Affine,
+        nodes: &[TreeNode],
+        a0: f64,
+        span: f64,
+        d: usize,
+        geo: (Point, f64, f64, f64),
+        base: f64,
+        col: &dyn Fn(usize) -> Rgba,
+    ) {
+        let (cen, hole, ring, total) = geo;
+        let sum: f64 = nodes.iter().map(|n| n.value).sum();
+        if sum <= 0.0 {
+            return;
+        }
+        let (ri, ro) = (hole + ring * d as f64, hole + ring * (d + 1) as f64);
+        let mut a = a0;
+        for (i, n) in nodes.iter().enumerate() {
+            let sweep = n.value / sum * span;
+            if sweep <= 0.0 {
+                continue;
+            }
+            let fill = col(i);
+            let mut p = BezPath::new();
+            p.move_to(Point::new(cen.x + ri * a.cos(), cen.y + ri * a.sin()));
+            p.line_to(Point::new(cen.x + ro * a.cos(), cen.y + ro * a.sin()));
+            p.extend(kurbo::Arc::new(cen, (ro, ro), a, sweep, 0.0).append_iter(0.1));
+            let a1 = a + sweep;
+            p.line_to(Point::new(cen.x + ri * a1.cos(), cen.y + ri * a1.sin()));
+            p.extend(kurbo::Arc::new(cen, (ri, ri), a1, -sweep, 0.0).append_iter(0.1));
+            p.close_path();
+            ctx.set_transform(m);
+            ctx.set_paint(color(fill, 1.0));
+            ctx.fill_path(&p);
+            ctx.set_paint(color(Rgba::WHITE, 1.0));
+            ctx.set_stroke(kurbo::Stroke::new(1.5));
+            ctx.stroke_path(&p);
+            // Labels where the segment has room for them.
+            let mid = a + sweep / 2.0;
+            let rr = (ri + ro) / 2.0;
+            if sweep * rr > base * 2.5 && !n.name.is_empty() {
+                let lp = Point::new(cen.x + rr * mid.cos(), cen.y + rr * mid.sin());
+                let half = (ring * 0.48).max(base);
+                label(
+                    ctx,
+                    rctx,
+                    m,
+                    &n.name,
+                    Rect::new(lp.x - half, lp.y - base, lp.x + half, lp.y + base),
+                    base * 0.9,
+                    Align::Center,
+                    Anchor::Middle,
+                    Rgba::WHITE,
+                    false,
+                );
+            }
+            if !n.children.is_empty() {
+                let k = lighten(fill, 0.15);
+                ring_of(ctx, rctx, m, &n.children, a, sweep, d + 1, (cen, hole, ring, total), base, &|_| k);
+            }
+            a = a1;
+        }
+    }
+    ring_of(ctx, rctx, m, &tree, -std::f64::consts::FRAC_PI_2, std::f64::consts::TAU, 0, (cen, hole, ring, total), base, &|i| {
+        series_color(rctx, c, i)
+    });
+}
+
 /// A box chart's summaries: per series, per group.
 pub struct Boxes {
     pub stats: Vec<Vec<Option<BoxStats>>>,
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 7b179485..f36adad1 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1777,3 +1777,29 @@ fn histogram_pareto_and_box_charts_draw() {
         assert!(n > blank + 400, "{kind:?}: {n} inked samples (blank {blank})");
     }
 }
+
+/// Multi-level treemaps and sunbursts draw their groups: the treemap's group banners and the
+/// sunburst's inner ring of groups, coloured by top-level group.
+#[test]
+fn multilevel_treemap_and_sunburst_draw_their_groups() {
+    for kind in [ChartType::Treemap, ChartType::Sunburst] {
+        let c = Chart::sample(kind);
+        let sh = Shape { id: ShapeId(623), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
+        let img = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+        if let Ok(dir) = std::env::var("DECKCRAFT_CHART_SHOTS") {
+            let _ = std::fs::write(format!("{dir}/{kind:?}-levels.png"), img.to_png());
+        }
+        // Distinct colours: one hue per top-level group plus lighter children.
+        let mut seen: Vec<[u8; 3]> = Vec::new();
+        for y in (60..520).step_by(8) {
+            for x in (40..920).step_by(8) {
+                let p = img.pixel(x, y);
+                let c = [p[0] / 16, p[1] / 16, p[2] / 16];
+                if c != [15, 15, 15] && !seen.contains(&c) {
+                    seen.push(c);
+                }
+            }
+        }
+        assert!(seen.len() >= 6, "{kind:?}: {} colours", seen.len());
+    }
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 7d0927f2..2fdebd52 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -73,7 +73,7 @@ the round trip even though DeckCraft doesn't model it.
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
-| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept; edited and new ones written from the model with a plain-chart fallback. Only the innermost hierarchy level; no region maps |
+| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept; edited and new ones written from the model with a plain-chart fallback. Treemap and sunburst hierarchy levels kept; no region maps |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
diff --git a/docs/gaps.md b/docs/gaps.md
index 253022cd..1d57e9ca 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -148,10 +148,10 @@ Detail in [file-format-parity.md](file-format-parity.md).
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, Pareto,
   box & whisker) are read, drawn, inserted, edited and saved as `chartEx` (kept unchanged, else
   written from the model, with a plain chart fallback). Waterfalls float and total, funnels,
-  treemaps (squarified) and sunbursts (innermost ring only) have their own layouts, histograms and
-  Paretos bin their data (count, width or Scott's rule), and box & whisker charts use exclusive
-  quartiles with 1.5 IQR whiskers. Multi-level treemap and sunburst hierarchies, inclusive
-  quartiles and region maps remain.
+  treemaps (squarified, nested by level with group banners) and sunbursts (one ring per level)
+  have their own layouts, histograms and Paretos bin their data (count, width or Scott's rule),
+  and box & whisker charts use exclusive or inclusive quartiles with 1.5 IQR whiskers. Region maps
+  remain.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 

From 27988aaa2498031503cbc998c815f45814b2ff8c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:19:18 +0300
Subject: [PATCH 214/376] Render 3-D extrusions: sides swept behind the face
 under turned cameras

sp3d extrusionH (with extrusionClr, srgb or scheme) under a camera that
turns the shape now draws the shape's sides: its outline swept from the
back face to the front along the camera's view of the depth axis, in the
side colour shaded, before the face. camera::project3 projects points
off the shape's plane.
---
 crates/render/src/camera.rs  |   9 ++-
 crates/render/src/extrude.rs | 119 +++++++++++++++++++++++++++++++++++
 crates/render/src/lib.rs     |  15 +++++
 crates/render/src/tests.rs   |  66 +++++++++++++++++++
 docs/gaps.md                 |   5 +-
 5 files changed, 211 insertions(+), 3 deletions(-)
 create mode 100644 crates/render/src/extrude.rs

diff --git a/crates/render/src/camera.rs b/crates/render/src/camera.rs
index 83c6f869..770b9445 100644
--- a/crates/render/src/camera.rs
+++ b/crates/render/src/camera.rs
@@ -116,8 +116,15 @@ pub fn from_raw(raw: &str) -> Option<Camera> {
 
 /// Where a point of the shape (relative to its centre) lands.
 fn project(c: &Camera, p: Point, size: f64) -> Point {
+    project3(c, p.x, p.y, 0.0, size)
+}
+
+/// Where a point in the shape's space (relative to its centre; z towards the viewer, so an
+/// extrusion runs to negative z) lands.
+pub fn project3(c: &Camera, x: f64, y: f64, z: f64, size: f64) -> Point {
+    let p = Point::new(x, y);
     let (a, b, r) = (c.lat.to_radians(), c.lon.to_radians(), -c.rev.to_radians());
-    let (x1, y1, z1) = (p.x * b.cos(), p.y, -p.x * b.sin());
+    let (x1, y1, z1) = (p.x * b.cos() + z * b.sin(), p.y, -p.x * b.sin() + z * b.cos());
     let (x2, y2, z2) = (x1, y1 * a.cos() - z1 * a.sin(), y1 * a.sin() + z1 * a.cos());
     let (x3, y3) = (x2 * r.cos() - y2 * r.sin(), x2 * r.sin() + y2 * r.cos());
     if c.dist > 0.0 {
diff --git a/crates/render/src/extrude.rs b/crates/render/src/extrude.rs
new file mode 100644
index 00000000..4fdde0d5
--- /dev/null
+++ b/crates/render/src/extrude.rs
@@ -0,0 +1,119 @@
+//! 3-D extrusion (`a:sp3d extrusionH`, `a:extrusionClr`) seen through a turned camera, drawn in
+//! 2-D: the shape's outline is swept from its back face to its front face along the camera's view
+//! of the depth axis, in the side colour, and the face is drawn on top as usual.
+//!
+//! The sides are one shaded colour (the extrusion colour, or the fill's, darkened as a matte side
+//! facing away from the three-point rig's key light); PowerPoint shades each side by its own
+//! normal. Without a turned camera an extrusion points at the viewer and nothing of it shows.
+
+use deckcraft_color::{Rgba, SchemeSlot};
+use deckcraft_model::ColorRef;
+use deckcraft_model::resolve::Ctx;
+use kurbo::{Affine, BezPath, Vec2};
+use vello_cpu::RenderContext;
+
+use crate::camera::{self, Camera};
+
+/// How much darker the sides are than the face colour.
+const SIDE_SHADE: f64 = 0.62;
+/// Most sweep steps (one per output pixel of depth up to this).
+const MAX_STEPS: usize = 96;
+
+/// An extrusion: its depth in points and its own colour, if set.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Extrusion {
+    pub depth: f64,
+    pub color: Option<ColorRef>,
+}
+
+fn attr<'a>(tag: &'a str, name: &str) -> Option<&'a str> {
+    let key = format!(" {name}=\"");
+    let s = tag.find(&key)? + key.len();
+    let rest = tag.get(s..)?;
+    rest.get(..rest.find('"')?)
+}
+
+/// The extrusion in 3-D XML kept from the file (`a:sp3d extrusionH="…"` with an `a:scene3d`).
+pub fn from_raw(raw: &str) -> Option<Extrusion> {
+    if !raw.contains("scene3d") {
+        return None;
+    }
+    let i = raw.find("sp3d ")?;
+    let tag = raw.get(i..)?;
+    let tag = tag.get(..tag.find('>')?)?;
+    let depth = attr(tag, "extrusionH")?.parse::<f64>().ok()? / 12700.0;
+    if !(depth.is_finite() && depth > 0.01) {
+        return None;
+    }
+    let color = raw.find("extrusionClr").and_then(|j| {
+        let body = raw.get(j..)?;
+        let body = body.get(..body.find("/a:extrusionClr").or_else(|| body.find("/extrusionClr")).unwrap_or(body.len()))?;
+        if let Some(k) = body.find("srgbClr ") {
+            let v = attr(body.get(k..)?, "val")?;
+            let n = u32::from_str_radix(v, 16).ok()?;
+            Some(ColorRef::rgb(Rgba::rgb((n >> 16) as u8, (n >> 8) as u8, n as u8)))
+        } else if let Some(k) = body.find("schemeClr ") {
+            SchemeSlot::from_xml(attr(body.get(k..)?, "val")?).map(ColorRef::scheme)
+        } else {
+            None
+        }
+    });
+    Some(Extrusion { depth: depth.min(4000.0), color })
+}
+
+/// The camera's view of the depth axis: where the back face sits relative to the front face, in
+/// the turned shape's space (the space `camera::affine` maps into).
+pub fn back_offset(c: &Camera, depth: f64, w: f64, h: f64) -> Vec2 {
+    let size = w.max(h);
+    camera::project3(c, 0.0, 0.0, -depth, size) - camera::project3(c, 0.0, 0.0, 0.0, size)
+}
+
+/// The side colour: the extrusion colour, or the face's, shaded.
+pub fn side_color(rctx: &Ctx, e: &Extrusion, face: Option<Rgba>) -> Rgba {
+    let base = e.color.as_ref().map(|c| rctx.color(c, face)).or(face).unwrap_or(Rgba::rgb(0x80, 0x80, 0x80));
+    let ch = |v: u8| (f64::from(v) * SIDE_SHADE).round().clamp(0.0, 255.0) as u8;
+    Rgba { r: ch(base.r), g: ch(base.g), b: ch(base.b), a: base.a }
+}
+
+/// Sweep `outline` (shape space) from its back face to its front face. `pre` maps the turned
+/// shape's space to the output and `turn` is the camera's turn, so the shape is drawn under
+/// `pre * turn` and its back face under `pre * translate(offset) * turn`.
+pub fn draw(ctx: &mut RenderContext, outline: &BezPath, pre: Affine, turn: Affine, offset: Vec2, side: Rgba) {
+    let px = (pre * offset.to_point() - pre * kurbo::Point::ZERO).hypot();
+    if !px.is_finite() || px < 0.25 {
+        return;
+    }
+    let steps = (px.ceil() as usize).clamp(1, MAX_STEPS);
+    ctx.set_paint(crate::color(side, 1.0));
+    for i in (0..steps).rev() {
+        let t = (i + 1) as f64 / steps as f64;
+        ctx.set_transform(pre * Affine::translate(offset * t) * turn);
+        ctx.fill_path(outline);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn reads_depth_and_colour() {
+        let raw = r#"<a:scene3d><a:camera prst="isometricOffAxis2Left"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="381000"><a:extrusionClr><a:srgbClr val="C00000"/></a:extrusionClr></a:sp3d>"#;
+        let e = from_raw(raw).unwrap();
+        assert!((e.depth - 30.0).abs() < 1e-9);
+        assert_eq!(e.color, Some(ColorRef::rgb(Rgba::rgb(0xC0, 0, 0))));
+        assert!(from_raw(r#"<a:sp3d extrusionH="381000"/>"#).is_none(), "no scene: drawn flat");
+        assert!(from_raw(r#"<a:scene3d/><a:sp3d/>"#).is_none());
+    }
+
+    #[test]
+    fn the_back_face_goes_away_from_the_viewer() {
+        // Turned left about the vertical axis, the back face shows to the right... of the turned
+        // face for a positive longitude, and nothing for a front camera.
+        let c = Camera { lat: 0.0, lon: 30.0, rev: 0.0, dist: 0.0 };
+        let o = back_offset(&c, 20.0, 100.0, 50.0);
+        assert!((o.x.abs() - 10.0).abs() < 1e-9 && o.y.abs() < 1e-9, "{o:?}");
+        let front = Camera { lat: 0.0, lon: 0.0, rev: 0.0, dist: 0.0 };
+        assert!(back_offset(&front, 20.0, 100.0, 50.0).hypot() < 1e-9);
+    }
+}
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..2eddf178 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -11,6 +11,7 @@ mod bevel;
 mod camera;
 mod chart;
 mod colr;
+mod extrude;
 
 mod compound;
 mod extent;
@@ -926,6 +927,20 @@ impl Renderer {
             ctx.push_layer(None, None, None, None, None);
             let _ = r;
         }
+        // A 3-D extrusion under a turned camera: the sides, swept behind the face.
+        if let Some(raw) = effects.as_ref().and_then(|e| e.raw3d.as_deref())
+            && let Some(ex) = extrude::from_raw(raw)
+            && let Some(cam) = camera::from_raw(raw)
+            && let Some(turn) = camera::affine(&cam, w, h)
+            && turn.determinant().abs() > 1e-9
+        {
+            let face = match &fill {
+                Some(Fill::Solid { color: c }) => Some(rctx.color(c, fill_ph)),
+                _ => None,
+            };
+            let pre = m * turn.inverse();
+            extrude::draw(ctx, &outline, pre, turn, extrude::back_offset(&cam, ex.depth, w, h), extrude::side_color(rctx, &ex, face));
+        }
         // Fill.
         match &s.kind {
             ShapeKind::Picture { fill: pf } => {
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..4df0a6ea 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1711,3 +1711,69 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
     let (w, h) = ink(deckcraft_model::text::TextDir::Vertical);
     assert!(h > w * 3, "vert: stroke on its side {w}x{h}");
 }
+
+/// Shapes with depth under turned cameras (an `extrusionH` and, on two, an `extrusionClr`).
+fn extruded_deck() -> Presentation {
+    let mk = |id: u32, x: f64, preset: &str, raw: &str| Shape {
+        id: ShapeId(id),
+        xfrm: Some(Xfrm::new(x, 170.0, 170.0, 130.0)),
+        geom: Geom::preset(preset),
+        style: Some(ShapeStyle::accent(deckcraft_color::SchemeSlot::Accent1)),
+        effects: Some(deckcraft_model::Effects { raw3d: Some(raw.into()), ..Default::default() }),
+        ..Default::default()
+    };
+    deck_with(vec![
+        mk(
+            700,
+            40.0,
+            "rect",
+            r#"<a:scene3d><a:camera prst="isometricOffAxis2Left"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="381000"/>"#,
+        ),
+        mk(
+            701,
+            280.0,
+            "ellipse",
+            r#"<a:scene3d><a:camera prst="isometricTopUp"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="254000"><a:extrusionClr><a:srgbClr val="C00000"/></a:extrusionClr></a:sp3d>"#,
+        ),
+        mk(
+            702,
+            520.0,
+            "star5",
+            r#"<a:scene3d><a:camera prst="perspectiveContrastingLeftFacing"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="508000"><a:extrusionClr><a:schemeClr val="accent2"/></a:extrusionClr></a:sp3d>"#,
+        ),
+        mk(
+            703,
+            760.0,
+            "rect",
+            r#"<a:scene3d><a:camera prst="orthographicFront"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="381000"/>"#,
+        ),
+    ])
+}
+
+#[test]
+fn extrusions_show_their_sides_under_a_turned_camera() {
+    let p = extruded_deck();
+    let img = render_slide(&p, 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    if let Ok(path) = std::env::var("DECKCRAFT_PNG_OUT") {
+        let _ = std::fs::write(path, img.to_png());
+    }
+    let count = |x0: u32, x1: u32, f: &dyn Fn([u8; 4]) -> bool| {
+        (x0..x1).flat_map(|x| (100..400).map(move |y| (x, y))).filter(|(x, y)| f(img.pixel(*x, *y))).count()
+    };
+    // The red sides of the ellipse; the dark accent-1 sides of the cube; none for a front camera.
+    assert!(count(250, 500, &|c| c[0] > 100 && c[1] < 40 && c[2] < 40) > 300, "red extrusion");
+    let flat = render_slide(&deck_with(vec![]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    let ink = |img: &Image, x0: u32, x1: u32| {
+        (x0..x1).flat_map(|x| (100..400).map(move |y| (x, y))).filter(|(x, y)| img.pixel(*x, *y) != [255, 255, 255, 255]).count()
+    };
+    let mut no_depth = extruded_deck();
+    for sh in &mut std::sync::Arc::make_mut(&mut no_depth.slides[0]).shapes {
+        if let Some(fx) = sh.effects.as_mut() {
+            fx.raw3d = fx.raw3d.as_ref().map(|r| r.replace(" extrusionH=", " x="));
+        }
+    }
+    let thin = render_slide(&no_depth, 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    assert!(ink(&img, 0, 260) > ink(&thin, 0, 260) + 1000, "the cube's sides add ink");
+    assert_eq!(ink(&img, 740, 960), ink(&thin, 740, 960), "a front camera shows no sides");
+    assert_eq!(ink(&flat, 0, 960), 0);
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..7a453409 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -169,8 +169,8 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
   `prstTxWarp` presets render and their adjusts round-trip, but there is no Transform gallery or
   command to apply one, no adjust handles, and arc/circle placement can differ from PowerPoint by
   1–3 % of the path length), "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting
-  render as approximations and `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces,
-  only the three-point rig, and no command or pane to apply 3-D).
+  render as approximations and `scene3d`/`sp3d` round-trip as raw XML; extrusions draw their
+  sides, in one shaded colour, under turned cameras; only the three-point rig, and no command or pane to apply 3-D).
 - **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
   rigs and materials, Format Shape page).
 
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | 3-D extrusions draw their sides under turned cameras |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |

From 6e403354247e419cd9fe52be241e84ce57c58c1a Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:22:22 +0300
Subject: [PATCH 215/376] SmartArt: Text Pane, add and remove shapes, promote
 and demote

A SmartArt group now keeps its outline (Shape.diagram: layout + nodes with
levels) and its shapes are regenerated from it inside the group's child
rectangle. New commands: smartArt.nodes, setNodes, addNode (after, before,
above, below), removeNode, promote, demote and layout. Sub-points become
bullets in their parent's shape; the hierarchy layout is a real tree with
connector lines. Text typed into a diagram shape is read back first.

UI: a SmartArt Design contextual tab and a Text Pane (Enter adds a line,
Tab/Shift+Tab demote/promote, Backspace on an empty line removes it).

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/insert.rs      |  95 +----
 crates/engine/src/cmd/mod.rs         |   2 +
 crates/engine/src/cmd/smartart.rs    | 603 +++++++++++++++++++++++++++
 crates/engine/src/tests.rs           |  49 +++
 crates/model/src/lib.rs              |  21 +
 crates/ui-egui/src/dialogs.rs        |   1 +
 crates/ui-egui/src/lib.rs            |  14 +-
 crates/ui-egui/src/panes.rs          |  95 +++++
 crates/ui-egui/src/ribbon.rs         |  51 +++
 crates/ui-egui/src/smartart_tests.rs |  53 +++
 docs/file-format-parity.md           |   2 +-
 docs/gaps.md                         |  12 +-
 docs/parity-checklist.md             |   6 +-
 docs/target-app-parity.md            |   2 +-
 14 files changed, 908 insertions(+), 98 deletions(-)
 create mode 100644 crates/engine/src/cmd/smartart.rs
 create mode 100644 crates/ui-egui/src/smartart_tests.rs

diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..8efa7f2a 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -82,7 +82,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "SmartArt",
             ["Insert", "Illustrations"],
             None,
-            "{kind: list|process|cycle|hierarchy|pyramid|matrix, items: [text]}",
+            "{kind: list|process|cycle|hierarchy|pyramid|matrix, items?: [text] (leading tabs = sub-points), nodes?: [{text, level}]} → {id}",
             has_slide,
             smart_art
         ),
@@ -709,92 +709,13 @@ fn chart_options(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
-/// SmartArt-style graphics built from shapes (grouped), with our own layouts.
+/// A SmartArt graphic: a group regenerated from its outline (see [`super::smartart`]). Items with
+/// leading tabs are sub-points; `nodes` (`[{text, level}]`) may be given instead.
 fn smart_art(s: &mut Session, p: &Value) -> Result<Value> {
     let kind = str_param(p, "kind").unwrap_or("process").to_string();
-    let items: Vec<String> =
-        p.get("items").and_then(Value::as_array).map(|a| a.iter().filter_map(Value::as_str).map(String::from).collect()).unwrap_or_default();
-    let items = if items.is_empty() { vec!["Text".to_string(); 3] } else { items };
-    let n = items.len().clamp(1, 12);
-    let size = s.doc()?.doc.slide_size;
-    let area = Xfrm::new(size.width * 0.1, size.height * 0.28, size.width * 0.8, size.height * 0.6);
-    let slots = [SchemeSlot::Accent1, SchemeSlot::Accent2, SchemeSlot::Accent3, SchemeSlot::Accent4, SchemeSlot::Accent5, SchemeSlot::Accent6];
-    let mut shapes: Vec<(String, Xfrm, usize)> = vec![];
-    match kind.as_str() {
-        "cycle" => {
-            let r = area.h.min(area.w) * 0.38;
-            let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
-            let d = r * 0.62;
-            for i in 0..n {
-                let a = (i as f64 / n as f64 * 360.0 - 90.0).to_radians();
-                shapes.push(("ellipse".into(), Xfrm::new(cx + r * a.cos() - d / 2.0, cy + r * a.sin() - d / 2.0, d, d), i));
-            }
-        }
-        "hierarchy" => {
-            let w = area.w / (n.max(2) - 1) as f64 * 0.8;
-            shapes.push(("roundRect".into(), Xfrm::new(area.x + area.w / 2.0 - w / 2.0, area.y, w, area.h * 0.3), 0));
-            for i in 1..n {
-                let x = area.x + (i - 1) as f64 * area.w / (n - 1).max(1) as f64;
-                shapes.push(("roundRect".into(), Xfrm::new(x + w * 0.1, area.y + area.h * 0.55, w, area.h * 0.3), i));
-            }
-        }
-        "pyramid" => {
-            let h = area.h / n as f64;
-            for i in 0..n {
-                let w = area.w * 0.25 + area.w * 0.75 * (i as f64 + 1.0) / n as f64;
-                shapes.push(("trapezoid".into(), Xfrm::new(area.x + (area.w - w) / 2.0, area.y + i as f64 * h, w, h * 0.95), i));
-            }
-        }
-        "matrix" => {
-            let (w, h) = (area.w / 2.0, area.h / 2.0);
-            for i in 0..n.min(4) {
-                shapes.push((
-                    "roundRect".into(),
-                    Xfrm::new(area.x + (i % 2) as f64 * w + 4.0, area.y + (i / 2) as f64 * h + 4.0, w - 8.0, h - 8.0),
-                    i,
-                ));
-            }
-        }
-        "list" => {
-            let h = area.h / n as f64;
-            for i in 0..n {
-                shapes.push(("roundRect".into(), Xfrm::new(area.x, area.y + i as f64 * h, area.w, h * 0.85), i));
-            }
-        }
-        _ => {
-            let gap = 24.0;
-            let w = (area.w - gap * (n as f64 - 1.0)) / n as f64;
-            for i in 0..n {
-                shapes.push((
-                    if i + 1 < n { "homePlate".into() } else { "roundRect".into() },
-                    Xfrm::new(area.x + i as f64 * (w + gap), area.y + area.h * 0.25, w, area.h * 0.5),
-                    i,
-                ));
-            }
-        }
-    }
-    let mut ids = vec![];
-    for (preset, x, i) in shapes {
-        let mut sh = Shape {
-            xfrm: Some(x),
-            geom: Geom::preset(&preset),
-            style: Some(ShapeStyle::accent(slots.get(i % 6).copied().unwrap_or(SchemeSlot::Accent1))),
-            ..Default::default()
-        };
-        let mut body = TextBody::from_text(items.get(i).map(String::as_str).unwrap_or(""));
-        body.body.autofit = Some(AutoFit::Shrink { font_scale: 1.0, line_reduction: 0.0 });
-        for para in &mut body.paragraphs {
-            para.props.align = Some(deckcraft_model::text::Align::Center);
-            for r in &mut para.runs {
-                r.props.size = Some(20.0);
-            }
-        }
-        sh.text = Some(body);
-        ids.push(add_shape(s, sh, false)?.0);
-    }
-    let g = s.execute("arrange.group", &json!({"ids": ids}))?;
-    if let Some(gid) = g.get("id").and_then(Value::as_u64) {
-        let _ = s.execute("shape.rename", &json!({"id": gid, "name": format!("SmartArt ({kind})")}));
-    }
-    Ok(g)
+    let nodes = match p.get("nodes") {
+        Some(v) => serde_json::from_value(v.clone()).map_err(|e| bad("insert.smartArt", e.to_string()))?,
+        None => super::smartart::nodes_from_lines(p.get("items").and_then(Value::as_array).into_iter().flatten().filter_map(Value::as_str)),
+    };
+    super::smartart::insert(s, &kind, nodes)
 }
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..e1b8eb4d 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -14,6 +14,7 @@ pub mod review;
 pub mod selection;
 pub mod shape;
 pub mod slide;
+pub mod smartart;
 pub mod table;
 pub mod text;
 pub mod transition;
@@ -129,6 +130,7 @@ pub fn command_specs() -> &'static [CommandSpec] {
         v.extend(edit::specs());
         v.extend(slide::specs());
         v.extend(insert::specs());
+        v.extend(smartart::specs());
         v.extend(shape::specs());
         v.extend(arrange::specs());
         v.extend(selection::specs());
diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
new file mode 100644
index 00000000..0993e87d
--- /dev/null
+++ b/crates/engine/src/cmd/smartart.rs
@@ -0,0 +1,603 @@
+//! SmartArt: a diagram's outline (the Text Pane) and the shapes generated from it.
+//!
+//! A SmartArt graphic is a group whose `diagram` holds its layout and its nodes (text + outline
+//! level). Every edit changes the nodes and regenerates the group's children inside the group's
+//! child rectangle, so the diagram keeps its size and place. Text typed straight into a diagram
+//! shape is read back into the nodes before each regeneration.
+
+use deckcraft_color::SchemeSlot;
+use deckcraft_geom::Xfrm;
+use deckcraft_model::text::{Align, AutoFit, Paragraph, TextBody};
+use deckcraft_model::{Diagram, DiagramNode, Fill, Geom, Presentation, Shape, ShapeId, ShapeKind, ShapeStyle};
+use serde_json::{Value, json};
+
+use super::*;
+use crate::{EngineError, Result, Session};
+
+/// Deepest outline level the Text Pane allows.
+pub const MAX_LEVEL: u8 = 8;
+/// Most top-level shapes a layout draws.
+const MAX_SHAPES: usize = 40;
+
+pub const KINDS: [&str; 6] = ["list", "process", "cycle", "hierarchy", "pyramid", "matrix"];
+
+pub fn specs() -> Vec<CommandSpec> {
+    vec![
+        cmd!(
+            query "smartArt.nodes",
+            "Text Pane",
+            ["SmartArt Design", "Create Graphic"],
+            None,
+            "{id?} → {id, kind, nodes: [{text, level}]} (id: the SmartArt group or one of its shapes; default the selection)",
+            has_selection,
+            nodes
+        ),
+        cmd!(
+            "smartArt.setNodes",
+            "Edit SmartArt Text",
+            ["SmartArt Design", "Create Graphic"],
+            None,
+            "{id?, nodes?: [{text, level}], lines?: [string] (leading tabs set the level), index?, text?} (index + text edits one node)",
+            has_selection,
+            set_nodes
+        ),
+        cmd!(
+            "smartArt.addNode",
+            "Add Shape",
+            ["SmartArt Design", "Create Graphic"],
+            None,
+            "{id?, index?, position?: after|before|below|above, text?} → {index} (default: after the last node)",
+            has_selection,
+            add_node
+        ),
+        cmd!(
+            "smartArt.removeNode",
+            "Remove Shape",
+            ["SmartArt Design", "Create Graphic"],
+            None,
+            "{id?, index} (its sub-points move up one level)",
+            has_selection,
+            remove_node
+        ),
+        cmd!("smartArt.promote", "Promote", ["SmartArt Design", "Create Graphic"], None, "{id?, index}", has_selection, promote),
+        cmd!("smartArt.demote", "Demote", ["SmartArt Design", "Create Graphic"], None, "{id?, index}", has_selection, demote),
+        cmd!(
+            "smartArt.layout",
+            "Change Layout",
+            ["SmartArt Design", "Layouts"],
+            None,
+            "{id?, kind: list|process|cycle|hierarchy|pyramid|matrix}",
+            has_selection,
+            change_layout
+        ),
+    ]
+}
+
+/// Nodes from text lines: each leading tab is one outline level.
+pub fn nodes_from_lines<'a>(lines: impl IntoIterator<Item = &'a str>) -> Vec<DiagramNode> {
+    lines
+        .into_iter()
+        .filter(|l| !l.trim().is_empty())
+        .map(|l| {
+            let tabs = l.chars().take_while(|c| *c == '\t').count();
+            DiagramNode { text: l.trim().to_string(), level: u8::try_from(tabs).unwrap_or(MAX_LEVEL).min(MAX_LEVEL) }
+        })
+        .collect()
+}
+
+/// Levels made consistent: the first node is top level and no node is more than one level
+/// deeper than the node before it.
+pub fn normalize(nodes: &mut [DiagramNode]) {
+    let mut prev: Option<u8> = None;
+    for n in nodes.iter_mut() {
+        n.level = match prev {
+            None => 0,
+            Some(p) => n.level.min(p.saturating_add(1)).min(MAX_LEVEL),
+        };
+        prev = Some(n.level);
+    }
+}
+
+/// Index one past the last descendant of node `i`.
+fn subtree_end(nodes: &[DiagramNode], i: usize) -> usize {
+    let lv = nodes.get(i).map(|n| n.level).unwrap_or(0);
+    let mut j = i + 1;
+    while nodes.get(j).is_some_and(|n| n.level > lv) {
+        j += 1;
+    }
+    j
+}
+
+/// Add a node next to node `index` (PowerPoint's Add Shape After/Before/Below/Above). Returns the
+/// new node's index.
+pub fn add(nodes: &mut Vec<DiagramNode>, index: Option<usize>, position: &str, text: &str) -> usize {
+    let Some(i) = index.filter(|i| *i < nodes.len()) else {
+        nodes.push(DiagramNode { text: text.into(), level: 0 });
+        return nodes.len() - 1;
+    };
+    let lv = nodes[i].level;
+    let (at, level) = match position {
+        "before" => (i, lv),
+        "below" => (subtree_end(nodes, i), (lv + 1).min(MAX_LEVEL)),
+        "above" => {
+            let end = subtree_end(nodes, i);
+            for n in &mut nodes[i..end] {
+                n.level = (n.level + 1).min(MAX_LEVEL);
+            }
+            (i, lv)
+        }
+        _ => (subtree_end(nodes, i), lv),
+    };
+    nodes.insert(at, DiagramNode { text: text.into(), level });
+    at
+}
+
+/// Remove node `i`; its sub-points move up one level.
+pub fn remove(nodes: &mut Vec<DiagramNode>, i: usize) -> bool {
+    if i >= nodes.len() {
+        return false;
+    }
+    let end = subtree_end(nodes, i);
+    for n in &mut nodes[i + 1..end] {
+        n.level = n.level.saturating_sub(1);
+    }
+    nodes.remove(i);
+    normalize(nodes);
+    true
+}
+
+/// Move node `i` and its sub-points one level up. False when it is already top level.
+pub fn promote_node(nodes: &mut [DiagramNode], i: usize) -> bool {
+    if nodes.get(i).is_none_or(|n| n.level == 0) {
+        return false;
+    }
+    let end = subtree_end(nodes, i);
+    for n in &mut nodes[i..end] {
+        n.level -= 1;
+    }
+    true
+}
+
+/// Move node `i` and its sub-points one level down, under the node before it. False when there is
+/// nothing to go under.
+pub fn demote_node(nodes: &mut [DiagramNode], i: usize) -> bool {
+    let (Some(prev), Some(cur)) = (i.checked_sub(1).and_then(|p| nodes.get(p)), nodes.get(i)) else { return false };
+    if cur.level > prev.level || cur.level >= MAX_LEVEL {
+        return false;
+    }
+    let end = subtree_end(nodes, i);
+    if nodes[i..end].iter().any(|n| n.level >= MAX_LEVEL) {
+        return false;
+    }
+    for n in &mut nodes[i..end] {
+        n.level += 1;
+    }
+    true
+}
+
+/// Which nodes each generated text shape shows, in child order (lines drawn after these carry none).
+fn node_map(d: &Diagram) -> Vec<Vec<usize>> {
+    if d.kind == "hierarchy" {
+        return (0..d.nodes.len().min(MAX_SHAPES)).map(|i| vec![i]).collect();
+    }
+    let mut out: Vec<Vec<usize>> = vec![];
+    for (i, n) in d.nodes.iter().enumerate() {
+        match out.last_mut() {
+            Some(g) if n.level > 0 => g.push(i),
+            _ => out.push(vec![i]),
+        }
+    }
+    let cap = if d.kind == "matrix" { 4 } else { MAX_SHAPES };
+    out.truncate(cap);
+    out
+}
+
+/// Read text typed into the diagram's shapes back into its nodes.
+fn sync_text(d: &mut Diagram, children: &[Shape]) {
+    for (shape, idx) in children.iter().zip(node_map(d)) {
+        let Some(body) = &shape.text else { continue };
+        if body.paragraphs.len() != idx.len() {
+            continue;
+        }
+        for (p, i) in body.paragraphs.iter().zip(idx) {
+            if let Some(n) = d.nodes.get_mut(i) {
+                n.text = p.text();
+            }
+        }
+    }
+}
+
+fn slot(i: usize) -> SchemeSlot {
+    [SchemeSlot::Accent1, SchemeSlot::Accent2, SchemeSlot::Accent3, SchemeSlot::Accent4, SchemeSlot::Accent5, SchemeSlot::Accent6][i % 6]
+}
+
+fn text_shape(preset: &str, x: Xfrm, color: usize, lines: &[&DiagramNode]) -> Shape {
+    let mut body = TextBody::default();
+    body.body.autofit = Some(AutoFit::Shrink { font_scale: 1.0, line_reduction: 0.0 });
+    let top = lines.first().map(|n| n.level).unwrap_or(0);
+    for (k, n) in lines.iter().enumerate() {
+        let mut para = Paragraph::new(&n.text);
+        if k == 0 {
+            para.props.align = Some(Align::Center);
+        } else {
+            para.level = n.level.saturating_sub(top).saturating_sub(1).min(MAX_LEVEL);
+            para.props.align = Some(Align::Left);
+            para.props.bullet = Some(deckcraft_model::text::Bullet::Char { char: "•".into() });
+            para.props.margin_left = Some(12.0 * (para.level as f64 + 1.0));
+            para.props.indent = Some(-10.0);
+        }
+        let size = if k == 0 { 20.0 } else { 14.0 };
+        for r in &mut para.runs {
+            r.props.size = Some(size);
+        }
+        para.end_props.size = Some(size);
+        body.paragraphs.push(para);
+    }
+    if body.paragraphs.is_empty() {
+        body.paragraphs.push(Paragraph::new(""));
+    }
+    Shape {
+        name: format!("SmartArt shape {}", color + 1),
+        xfrm: Some(x),
+        geom: Geom::preset(preset),
+        style: Some(ShapeStyle::accent(slot(color))),
+        text: Some(body),
+        ..Default::default()
+    }
+}
+
+fn line_shape(a: (f64, f64), b: (f64, f64)) -> Shape {
+    let mut x = Xfrm::new(a.0.min(b.0), a.1.min(b.1), (b.0 - a.0).abs(), (b.1 - a.1).abs());
+    x.flip_h = (b.0 < a.0) != (b.1 < a.1);
+    Shape {
+        name: "SmartArt connector".into(),
+        xfrm: Some(x),
+        geom: Geom::preset("line"),
+        style: Some(ShapeStyle::accent(SchemeSlot::Accent1)),
+        fill: Some(Fill::None),
+        ..Default::default()
+    }
+}
+
+/// The diagram's shapes laid out in `area` (ids not yet assigned).
+pub fn layout(d: &Diagram, area: Xfrm) -> Vec<Shape> {
+    let map = node_map(d);
+    let groups: Vec<Vec<&DiagramNode>> = map.iter().map(|g| g.iter().filter_map(|i| d.nodes.get(*i)).collect()).collect();
+    let n = groups.len().max(1);
+    let mut out = vec![];
+    match d.kind.as_str() {
+        "hierarchy" => return hierarchy(d, area),
+        "cycle" => {
+            let r = area.h.min(area.w) * 0.38;
+            let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
+            let dd = r * 0.62;
+            for (i, g) in groups.iter().enumerate() {
+                let a = (i as f64 / n as f64 * 360.0 - 90.0).to_radians();
+                out.push(text_shape("ellipse", Xfrm::new(cx + r * a.cos() - dd / 2.0, cy + r * a.sin() - dd / 2.0, dd, dd), i, g));
+            }
+        }
+        "pyramid" => {
+            let h = area.h / n as f64;
+            for (i, g) in groups.iter().enumerate() {
+                let w = area.w * 0.25 + area.w * 0.75 * (i as f64 + 1.0) / n as f64;
+                out.push(text_shape("trapezoid", Xfrm::new(area.x + (area.w - w) / 2.0, area.y + i as f64 * h, w, h * 0.95), i, g));
+            }
+        }
+        "matrix" => {
+            let (w, h) = (area.w / 2.0, area.h / 2.0);
+            for (i, g) in groups.iter().enumerate() {
+                let x = Xfrm::new(area.x + (i % 2) as f64 * w + 4.0, area.y + (i / 2) as f64 * h + 4.0, w - 8.0, h - 8.0);
+                out.push(text_shape("roundRect", x, i, g));
+            }
+        }
+        "list" => {
+            let h = area.h / n as f64;
+            for (i, g) in groups.iter().enumerate() {
+                out.push(text_shape("roundRect", Xfrm::new(area.x, area.y + i as f64 * h, area.w, h * 0.85), i, g));
+            }
+        }
+        _ => {
+            let gap = 24.0;
+            let w = ((area.w - gap * (n as f64 - 1.0)) / n as f64).max(1.0);
+            for (i, g) in groups.iter().enumerate() {
+                let preset = if i + 1 < n { "homePlate" } else { "roundRect" };
+                out.push(text_shape(preset, Xfrm::new(area.x + i as f64 * (w + gap), area.y + area.h * 0.25, w, area.h * 0.5), i, g));
+            }
+        }
+    }
+    out
+}
+
+/// An organisation chart: one box per node, rows by level, each subtree as wide as its leaves.
+fn hierarchy(d: &Diagram, area: Xfrm) -> Vec<Shape> {
+    let nodes = &d.nodes[..d.nodes.len().min(MAX_SHAPES)];
+    if nodes.is_empty() {
+        return vec![];
+    }
+    let mut parent: Vec<Option<usize>> = vec![None; nodes.len()];
+    let mut stack: Vec<usize> = vec![];
+    for (i, n) in nodes.iter().enumerate() {
+        while stack.last().is_some_and(|&p| nodes[p].level >= n.level) {
+            stack.pop();
+        }
+        parent[i] = stack.last().copied();
+        stack.push(i);
+    }
+    let kids = |i: Option<usize>| -> Vec<usize> { (0..nodes.len()).filter(|&k| parent[k] == i).collect() };
+    let mut leaves = vec![0usize; nodes.len()];
+    for i in (0..nodes.len()).rev() {
+        let k = kids(Some(i));
+        leaves[i] = if k.is_empty() { 1 } else { k.iter().map(|&c| leaves[c]).sum() };
+    }
+    let depth: Vec<usize> = (0..nodes.len())
+        .map(|i| {
+            let (mut d, mut p) = (0, parent[i]);
+            while let Some(q) = p {
+                d += 1;
+                p = parent[q];
+            }
+            d
+        })
+        .collect();
+    let rows = depth.iter().max().copied().unwrap_or(0) + 1;
+    let total: usize = kids(None).iter().map(|&r| leaves[r]).sum::<usize>().max(1);
+    let cell_w = area.w / total as f64;
+    let row_h = area.h / rows as f64;
+    let (bw, bh) = (cell_w * 0.85, row_h * 0.6);
+    // Left edge (in leaves) of each node's span.
+    let mut left = vec![0usize; nodes.len()];
+    let mut next_root = 0;
+    for i in 0..nodes.len() {
+        let mut start = match parent[i] {
+            None => {
+                let s = next_root;
+                next_root += leaves[i];
+                s
+            }
+            Some(p) => left[p],
+        };
+        if let Some(p) = parent[i] {
+            for s in kids(Some(p)) {
+                if s == i {
+                    break;
+                }
+                start += leaves[s];
+            }
+        }
+        left[i] = start;
+    }
+    let boxes: Vec<Xfrm> = (0..nodes.len())
+        .map(|i| {
+            let cx = area.x + (left[i] as f64 + leaves[i] as f64 / 2.0) * cell_w;
+            Xfrm::new(cx - bw / 2.0, area.y + depth[i] as f64 * row_h + (row_h - bh) / 2.0, bw, bh)
+        })
+        .collect();
+    let mut out: Vec<Shape> = nodes.iter().enumerate().map(|(i, n)| text_shape("roundRect", boxes[i], depth[i], &[n])).collect();
+    for i in 0..nodes.len() {
+        if let Some(p) = parent[i] {
+            let (a, b) = (boxes[p], boxes[i]);
+            out.push(line_shape((a.x + a.w / 2.0, a.y + a.h), (b.x + b.w / 2.0, b.y)));
+        }
+    }
+    out
+}
+
+/// The SmartArt group that `id` is, or is inside.
+fn diagram_group(shapes: &[Shape], id: ShapeId) -> Option<&Shape> {
+    for sh in shapes {
+        if sh.id == id && sh.diagram.is_some() {
+            return Some(sh);
+        }
+        if let ShapeKind::Group { children, .. } = &sh.kind {
+            if sh.diagram.is_some() && deckcraft_model::find_shape(children, id).is_some() {
+                return Some(sh);
+            }
+            if let Some(g) = diagram_group(children, id) {
+                return Some(g);
+            }
+        }
+    }
+    None
+}
+
+/// The SmartArt graphic the selection is (or is inside), with its outline as the Text Pane shows it.
+pub fn selected(st: &crate::DocState) -> Option<(ShapeId, Diagram)> {
+    let shapes = current_shapes(&st.doc, &st.selection)?;
+    let g = st.selection.shapes.iter().find_map(|id| diagram_group(shapes, *id))?;
+    let mut d = g.diagram.clone()?;
+    if let ShapeKind::Group { children, .. } = &g.kind {
+        sync_text(&mut d, children);
+    }
+    Some((g.id, d))
+}
+
+fn target_group(s: &Session, p: &Value, cmd: &str) -> Result<ShapeId> {
+    let st = s.doc()?;
+    let shapes = current_shapes(&st.doc, &st.selection).ok_or_else(|| bad(cmd, "no slide"))?;
+    let ids = targets(s, p)?;
+    ids.iter().find_map(|id| diagram_group(shapes, *id)).map(|g| g.id).ok_or_else(|| bad(cmd, "select a SmartArt graphic"))
+}
+
+/// Children with fresh ids for diagram `d` inside a group whose child space is `area`.
+fn regenerate(doc: &mut Presentation, d: &Diagram, area: Xfrm) -> Vec<Shape> {
+    let mut v = layout(d, area);
+    for sh in &mut v {
+        sh.id = ShapeId(doc.alloc_id());
+    }
+    v
+}
+
+/// Read the diagram (with typed text synced), let `f` change it, and regenerate the group.
+fn edit_diagram<T>(s: &mut Session, p: &Value, cmd: &str, f: impl FnOnce(&mut Diagram) -> Result<T>) -> Result<T> {
+    let gid = target_group(s, p, cmd)?;
+    s.edit(|doc, sel| {
+        let g = current_shapes(doc, sel).and_then(|v| deckcraft_model::find_shape(v, gid)).cloned().ok_or_else(|| bad(cmd, "no such shape"))?;
+        let (ShapeKind::Group { children, child }, Some(mut d)) = (g.kind, g.diagram) else { return Err(bad(cmd, "not a SmartArt graphic")) };
+        sync_text(&mut d, &children);
+        let out = f(&mut d)?;
+        normalize(&mut d.nodes);
+        let kids = regenerate(doc, &d, child);
+        let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad(cmd, "no slide"))?;
+        let sh = deckcraft_model::find_shape_mut(shapes, gid).ok_or_else(|| bad(cmd, "no such shape"))?;
+        sh.kind = ShapeKind::Group { children: kids, child };
+        sh.diagram = Some(d);
+        sel.shapes = vec![gid];
+        sel.text = None;
+        Ok(out)
+    })
+}
+
+fn index(p: &Value, cmd: &str) -> Result<usize> {
+    p.get("index").and_then(Value::as_u64).and_then(|v| usize::try_from(v).ok()).ok_or_else(|| bad(cmd, "index is required"))
+}
+
+/// Insert a new SmartArt graphic (`insert.smartArt`).
+pub fn insert(s: &mut Session, kind: &str, mut nodes: Vec<DiagramNode>) -> Result<Value> {
+    let kind = if KINDS.contains(&kind) { kind } else { "process" };
+    if nodes.is_empty() {
+        nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0 }).collect();
+    }
+    normalize(&mut nodes);
+    let d = Diagram { kind: kind.into(), nodes };
+    let size = s.doc()?.doc.slide_size;
+    let area = Xfrm::new(size.width * 0.1, size.height * 0.28, size.width * 0.8, size.height * 0.6);
+    let id = s.edit(|doc, sel| {
+        let children = regenerate(doc, &d, area);
+        let id = ShapeId(doc.alloc_id());
+        let g = Shape {
+            id,
+            name: format!("SmartArt ({kind})"),
+            xfrm: Some(area),
+            kind: ShapeKind::Group { children, child: area },
+            diagram: Some(d),
+            ..Default::default()
+        };
+        crate::shapes_mut(doc, sel).ok_or_else(|| EngineError::Other("no slide".into()))?.push(g);
+        sel.shapes = vec![id];
+        sel.text = None;
+        Ok(id)
+    })?;
+    Ok(json!({"id": id.0}))
+}
+
+fn nodes(s: &mut Session, p: &Value) -> Result<Value> {
+    let gid = target_group(s, p, "smartArt.nodes")?;
+    let g = shape_of(s, gid)?;
+    let mut d = g.diagram.unwrap_or_default();
+    if let ShapeKind::Group { children, .. } = &g.kind {
+        sync_text(&mut d, children);
+    }
+    Ok(json!({"id": gid.0, "kind": d.kind, "nodes": d.nodes}))
+}
+
+fn set_nodes(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.setNodes";
+    let given: Option<Vec<DiagramNode>> = match (p.get("nodes"), p.get("lines").and_then(Value::as_array)) {
+        (Some(v), _) => Some(serde_json::from_value(v.clone()).map_err(|e| bad(CMD, e.to_string()))?),
+        (None, Some(a)) => Some(nodes_from_lines(a.iter().filter_map(Value::as_str))),
+        _ => None,
+    };
+    let one = p.get("index").map(|_| index(p, CMD)).transpose()?;
+    let text = str_param(p, "text").map(String::from);
+    edit_diagram(s, p, CMD, |d| {
+        if let Some(n) = given {
+            d.nodes = n;
+        }
+        if let (Some(i), Some(t)) = (one, text) {
+            d.nodes.get_mut(i).ok_or_else(|| bad(CMD, "no such node"))?.text = t;
+        }
+        Ok(Value::Null)
+    })
+}
+
+fn add_node(s: &mut Session, p: &Value) -> Result<Value> {
+    let i = p.get("index").and_then(Value::as_u64).and_then(|v| usize::try_from(v).ok());
+    let pos = str_param(p, "position").unwrap_or("after").to_string();
+    let text = str_param(p, "text").unwrap_or("").to_string();
+    edit_diagram(s, p, "smartArt.addNode", |d| {
+        let at = add(&mut d.nodes, i, &pos, &text);
+        Ok(json!({"index": at}))
+    })
+}
+
+fn remove_node(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.removeNode";
+    let i = index(p, CMD)?;
+    edit_diagram(s, p, CMD, |d| if remove(&mut d.nodes, i) { Ok(Value::Null) } else { Err(bad(CMD, "no such node")) })
+}
+
+fn promote(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.promote";
+    let i = index(p, CMD)?;
+    edit_diagram(s, p, CMD, |d| if promote_node(&mut d.nodes, i) { Ok(Value::Null) } else { Err(bad(CMD, "already at the top level")) })
+}
+
+fn demote(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.demote";
+    let i = index(p, CMD)?;
+    edit_diagram(s, p, CMD, |d| if demote_node(&mut d.nodes, i) { Ok(Value::Null) } else { Err(bad(CMD, "nothing above to demote under")) })
+}
+
+fn change_layout(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.layout";
+    let kind = str_param(p, "kind").filter(|k| KINDS.contains(k)).ok_or_else(|| bad(CMD, "unknown layout"))?.to_string();
+    edit_diagram(s, p, CMD, |d| {
+        d.kind = kind;
+        Ok(Value::Null)
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn lv(n: &[DiagramNode]) -> Vec<u8> {
+        n.iter().map(|x| x.level).collect()
+    }
+    fn mk(levels: &[u8]) -> Vec<DiagramNode> {
+        levels.iter().enumerate().map(|(i, l)| DiagramNode { text: format!("n{i}"), level: *l }).collect()
+    }
+
+    #[test]
+    fn outline_edits() {
+        let mut n = mk(&[0, 1, 1, 0]);
+        assert_eq!(add(&mut n, Some(0), "after", "x"), 3, "after the node's sub-points");
+        assert_eq!(lv(&n), [0, 1, 1, 0, 0]);
+        assert_eq!(add(&mut n, Some(0), "below", "y"), 3);
+        assert_eq!(lv(&n), [0, 1, 1, 1, 0, 0]);
+        assert_eq!(add(&mut n, Some(0), "above", "z"), 0);
+        assert_eq!(lv(&n), [0, 1, 2, 2, 2, 0, 0]);
+        assert!(remove(&mut n, 1));
+        assert_eq!(lv(&n), [0, 1, 1, 1, 0, 0]);
+        assert!(!promote_node(&mut n, 0));
+        assert!(!demote_node(&mut n, 0), "nothing above the first node");
+        assert!(!demote_node(&mut n, 2) || lv(&n)[2] == 2);
+        let mut m = mk(&[0, 0, 1]);
+        assert!(demote_node(&mut m, 1));
+        assert_eq!(lv(&m), [0, 1, 2], "sub-points move with their node");
+        assert!(promote_node(&mut m, 1));
+        assert_eq!(lv(&m), [0, 0, 1]);
+        let mut bad = mk(&[2, 4, 0]);
+        normalize(&mut bad);
+        assert_eq!(lv(&bad), [0, 1, 0]);
+        assert_eq!(lv(&nodes_from_lines(["A", "\tB", "\t\tC", "", "D"])), [0, 1, 2, 0]);
+    }
+
+    #[test]
+    fn layouts_map_nodes_to_shapes() {
+        let area = Xfrm::new(0.0, 0.0, 800.0, 400.0);
+        let d = Diagram { kind: "list".into(), nodes: mk(&[0, 1, 1, 0]) };
+        let v = layout(&d, area);
+        assert_eq!(v.len(), 2);
+        let t = v[0].text.as_ref().map(|b| b.paragraphs.len());
+        assert_eq!(t, Some(3), "sub-points are bullets in their parent's shape");
+        let h = Diagram { kind: "hierarchy".into(), nodes: mk(&[0, 1, 2, 1]) };
+        let v = layout(&h, area);
+        assert_eq!(v.len(), 4 + 3, "a box per node and a line per parent link");
+        for sh in &v {
+            let x = sh.xfrm.unwrap_or_default();
+            assert!(x.x >= -0.01 && x.x + x.w <= 800.01 && x.y >= -0.01 && x.y + x.h <= 400.01, "{x:?}");
+        }
+        assert!(layout(&Diagram { kind: "cycle".into(), nodes: vec![] }, area).is_empty());
+    }
+}
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..9d725f88 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,52 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn smartart_text_pane_edits_regenerate_the_diagram() {
+    let mut s = session();
+    let r = s.execute("insert.smartArt", &json!({"kind": "list", "items": ["Plan", "\tScope", "Build"]})).unwrap();
+    let gid = r["id"].as_u64().unwrap();
+    let kids = |s: &Session| match s.doc().unwrap().shape(deckcraft_model::ShapeId(gid as u32)).map(|x| &x.kind) {
+        Some(deckcraft_model::ShapeKind::Group { children, .. }) => children.clone(),
+        _ => panic!("not a group"),
+    };
+    assert_eq!(kids(&s).len(), 2, "Scope is a bullet inside Plan");
+    let box_before = s.doc().unwrap().shape(deckcraft_model::ShapeId(gid as u32)).unwrap().xfrm;
+
+    // Type into the second shape directly, then add a node: the typed text is kept.
+    let build = kids(&s)[1].id.0;
+    s.execute("text.edit", &json!({"id": build, "end": true})).unwrap();
+    s.execute("text.insert", &json!({"text": " it"})).unwrap();
+    let r = s.execute("smartArt.addNode", &json!({"id": gid, "index": 2, "position": "after", "text": "Ship"})).unwrap();
+    assert_eq!(r["index"], 3);
+    let n = s.execute("smartArt.nodes", &json!({"id": gid})).unwrap();
+    let texts: Vec<&str> = n["nodes"].as_array().unwrap().iter().map(|x| x["text"].as_str().unwrap()).collect();
+    assert_eq!(texts, ["Plan", "Scope", "Build it", "Ship"]);
+    assert_eq!(kids(&s).len(), 3);
+
+    // Demote Ship under Build, promote Scope, remove Plan.
+    s.execute("smartArt.demote", &json!({"id": gid, "index": 3})).unwrap();
+    assert_eq!(kids(&s).len(), 2);
+    s.execute("smartArt.promote", &json!({"id": gid, "index": 1})).unwrap();
+    assert_eq!(kids(&s).len(), 3);
+    assert!(s.execute("smartArt.promote", &json!({"id": gid, "index": 0})).is_err());
+    s.execute("smartArt.removeNode", &json!({"id": gid, "index": 0})).unwrap();
+    let n = s.execute("smartArt.nodes", &json!({"id": gid})).unwrap();
+    let lv: Vec<u64> = n["nodes"].as_array().unwrap().iter().map(|x| x["level"].as_u64().unwrap()).collect();
+    assert_eq!(lv, [0, 0, 1]);
+
+    // A child shape also finds its diagram; layouts switch; the box stays put; undo works.
+    let child = kids(&s)[0].id.0;
+    s.execute("smartArt.layout", &json!({"id": child, "kind": "hierarchy"})).unwrap();
+    assert_eq!(kids(&s).len(), 3 + 1, "three boxes and one link");
+    assert_eq!(s.doc().unwrap().shape(deckcraft_model::ShapeId(gid as u32)).unwrap().xfrm, box_before);
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(kids(&s).len(), 2);
+
+    // The outline survives a .deckcraft save.
+    let doc = s.doc().unwrap().doc.as_ref().clone();
+    let bytes = deckcraft_format::save(&doc).unwrap();
+    let back = deckcraft_format::load(&bytes).unwrap();
+    assert!(back.slides[0].shapes.iter().any(|x| x.diagram.as_ref().is_some_and(|d| d.nodes.len() == 3)));
+}
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..bdd52a63 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -320,6 +320,26 @@ pub struct Shape {
     /// Unmodelled XML kept for round-trip (extension lists etc.).
     #[serde(skip_serializing_if = "Option::is_none")]
     pub raw_ext: Option<String>,
+    /// On a SmartArt group: the diagram's text outline, from which its shapes are regenerated.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub diagram: Option<Diagram>,
+}
+
+/// A SmartArt diagram's data: its layout and its outline of nodes (the Text Pane).
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+#[serde(default, rename_all = "camelCase")]
+pub struct Diagram {
+    /// list, process, cycle, hierarchy, pyramid or matrix.
+    pub kind: String,
+    pub nodes: Vec<DiagramNode>,
+}
+
+/// One line of the Text Pane: its text and outline level (0 = top level).
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+#[serde(default, rename_all = "camelCase")]
+pub struct DiagramNode {
+    pub text: String,
+    pub level: u8,
 }
 
 impl Default for Shape {
@@ -345,6 +365,7 @@ impl Default for Shape {
             click: None,
             hover: None,
             raw_ext: None,
+            diagram: None,
         }
     }
 }
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..2c685540 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -683,6 +683,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             let (ok, cancel) = buttons(ui, "Insert");
             if ok {
                 run(app, "insert.smartArt", json!({"kind": kind, "items": v.lines().filter(|l| !l.trim().is_empty()).collect::<Vec<_>>()}));
+                app.ui.pane = Some("smartart".into());
             }
             ok || cancel
         }
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..6b2f0e33 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -86,7 +86,8 @@ pub struct UiState {
     pub notes: bool,
     pub notes_height: f32,
     pub thumbs_width: f32,
-    /// Open task pane: `format`, `animation`, `selection`, `comments`, `designer`, `background`.
+    /// Open task pane: `format`, `animation`, `selection`, `comments`, `designer`, `background`,
+    /// `smartart` (Text Pane).
     pub pane: Option<String>,
     pub pane_width: f32,
     pub ruler: bool,
@@ -101,6 +102,12 @@ pub struct UiState {
     pub ui_scale: f32,
     /// Format Shape pane: tab (`fill`, `effects`, `size`, `picture`, `text`).
     pub format_tab: String,
+    /// The Text Pane's current SmartArt line (Add Shape, Promote and Demote act on it).
+    pub smartart_row: usize,
+    /// A Text Pane line to focus once it is drawn (after Enter, Tab or Backspace rebuilt the list).
+    pub smartart_focus: Option<usize>,
+    /// The Text Pane's line drafts, for the SmartArt group they were read from.
+    pub smartart_drafts: (u32, Vec<String>),
     pub grayscale: bool,
 }
 
@@ -126,6 +133,9 @@ impl Default for UiState {
             presenter_view: true,
             ui_scale: 1.0,
             format_tab: "fill".into(),
+            smartart_row: 0,
+            smartart_focus: None,
+            smartart_drafts: (0, vec![]),
             grayscale: false,
         }
     }
@@ -146,7 +156,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("view.zoomOut", "Zoom Out", Some("Cmd+-"), "{}"),
     ("view.zoom", "Zoom…", None, "{percent}"),
     ("view.fit", "Fit to Window", None, "{}"),
-    ("view.pane", "Task Pane", None, "{pane: format|animation|selection|comments|designer|background|null}"),
+    ("view.pane", "Task Pane", None, "{pane: format|animation|selection|comments|designer|background|smartart|null}"),
     ("view.tab", "Ribbon Tab", None, "{tab}"),
     ("view.collapseRibbon", "Collapse the Ribbon", Some("Cmd+F1"), "{}"),
     ("view.dark", "Dark Mode", None, "{on?: bool}"),
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..5088dc0b 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -27,6 +27,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                 "selection" => "Selection",
                 "comments" => "Comments",
                 "designer" => "Design Ideas",
+                "smartart" => "Text Pane",
                 _ => "Pane",
             };
             ui.horizontal(|ui| {
@@ -50,11 +51,101 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
                 "selection" => crate::selpane::show(app, ui),
                 "comments" => comments(app, ui),
                 "designer" => designer(app, ui),
+                "smartart" => smartart(app, ui),
                 _ => {}
             });
         });
 }
 
+/// SmartArt Text Pane: one line per node, indented by level. Enter adds a line after, Tab and
+/// Shift+Tab demote and promote, Backspace in an empty line removes it.
+fn smartart(app: &mut SlideApp, ui: &mut Ui) {
+    let Some((gid, d)) = app.session.active().and_then(deckcraft_engine::cmd::smartart::selected) else {
+        ui.label("Select a SmartArt graphic to edit its text.");
+        return;
+    };
+    let texts: Vec<String> = d.nodes.iter().map(|n| n.text.clone()).collect();
+    let focused_any = ui.ctx().memory(|m| m.focused().is_some()) || app.ui.smartart_focus.is_some();
+    if app.ui.smartart_drafts.0 != gid.0 || app.ui.smartart_drafts.1.len() != texts.len() || !focused_any {
+        app.ui.smartart_drafts = (gid.0, texts.clone());
+    }
+    let mut drafts = std::mem::take(&mut app.ui.smartart_drafts.1);
+    let mut action: Option<(&str, Value)> = None;
+    let mut commit: Option<usize> = None;
+    let mut focus_row: Option<usize> = None;
+    ui.label(egui::RichText::new("Type your text here").color(Tokens::get(ui.ctx()).text_dim));
+    ui.add_space(4.0);
+    for (i, node) in d.nodes.iter().enumerate() {
+        let Some(draft) = drafts.get_mut(i) else { break };
+        let id = egui::Id::new(("smartart_line", gid.0, i));
+        ui.horizontal(|ui| {
+            ui.add_space(16.0 * node.level as f32);
+            ui.label("•");
+            let te = egui::TextEdit::singleline(draft).id(id).desired_width(f32::INFINITY);
+            let r = ui.add(te);
+            if app.ui.smartart_focus == Some(i) {
+                r.request_focus();
+                app.ui.smartart_focus = None;
+            }
+            if r.gained_focus() || r.has_focus() {
+                app.ui.smartart_row = i;
+            }
+            if r.has_focus() {
+                let back = ui.input(|inp| inp.key_pressed(egui::Key::Backspace));
+                if back && draft.is_empty() && texts.get(i).is_some_and(String::is_empty) && d.nodes.len() > 1 {
+                    action = Some(("smartArt.removeNode", json!({"index": i})));
+                    focus_row = Some(i.saturating_sub(1));
+                }
+            }
+            if r.lost_focus() {
+                let (tab, shift) = ui.input(|inp| (inp.key_pressed(egui::Key::Tab), inp.modifiers.shift));
+                if tab {
+                    action = Some((if shift { "smartArt.promote" } else { "smartArt.demote" }, json!({"index": i})));
+                    focus_row = Some(i);
+                } else if ui.input(|inp| inp.key_pressed(egui::Key::Enter)) {
+                    action = Some(("smartArt.addNode", json!({"index": i, "position": "after"})));
+                    focus_row = Some(i + 1);
+                }
+                commit = Some(i);
+            }
+        });
+    }
+    ui.add_space(6.0);
+    ui.horizontal(|ui| {
+        if ui.button("+ Add").clicked() {
+            action = Some(("smartArt.addNode", json!({"index": app.ui.smartart_row.min(d.nodes.len().saturating_sub(1)), "position": "after"})));
+        }
+        if ui.button("Remove").clicked() && !d.nodes.is_empty() {
+            action = Some(("smartArt.removeNode", json!({"index": app.ui.smartart_row.min(d.nodes.len() - 1)})));
+        }
+    });
+    // Commit a changed line before any structural edit, so the edit sees the new text.
+    if let Some(i) = commit
+        && drafts.get(i) != texts.get(i)
+    {
+        run(app, "smartArt.setNodes", json!({"id": gid.0, "index": i, "text": drafts.get(i).cloned().unwrap_or_default()}));
+    }
+    if action.is_some() {
+        for (i, t) in drafts.iter().enumerate() {
+            if Some(i) != commit && texts.get(i) != Some(t) {
+                run(app, "smartArt.setNodes", json!({"id": gid.0, "index": i, "text": t}));
+            }
+        }
+    }
+    app.ui.smartart_drafts.1 = drafts;
+    if let Some((cmd, mut p)) = action {
+        if let Some(o) = p.as_object_mut() {
+            o.insert("id".into(), json!(gid.0));
+        }
+        if let Ok(r) = app.run(cmd, p) {
+            let row = r.get("index").and_then(Value::as_u64).map(|v| v as usize).or(focus_row).unwrap_or(0);
+            app.ui.smartart_row = row;
+            app.ui.smartart_drafts.0 = 0;
+            app.ui.smartart_focus = Some(row);
+        }
+    }
+}
+
 fn run(app: &mut SlideApp, id: &str, p: Value) {
     let _ = app.run(id, p);
 }
@@ -635,3 +726,7 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
         ui.add_space(8.0);
     }
 }
+
+#[cfg(test)]
+#[path = "smartart_tests.rs"]
+mod smartart_tests;
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..c4c31c81 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -122,6 +122,9 @@ fn contextual(app: &SlideApp) -> Vec<&'static str> {
         v.push("Table Design");
         v.push("Layout");
     }
+    if deckcraft_engine::cmd::smartart::selected(st).is_some() {
+        v.push("SmartArt Design");
+    }
     if shapes.iter().any(|s| matches!(s.kind, ShapeKind::Chart(_))) {
         v.push("Chart Design");
     }
@@ -220,6 +223,7 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
             "Table Design" => table_design(app, ui),
             "Layout" => table_layout(app, ui),
             "Chart Design" => chart_design(app, ui),
+            "SmartArt Design" => smartart_design(app, ui),
             "Playback" => playback(app, ui),
             "Slide Master" => slide_master(app, ui),
             _ => {}
@@ -2318,6 +2322,53 @@ fn chart_design(app: &mut SlideApp, ui: &mut Ui) {
     arrange_group(app, ui);
 }
 
+/// SmartArt Design: Create Graphic (Text Pane, Add Shape, Promote, Demote, Remove) and Layouts.
+fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
+    let sel = app.session.active().and_then(deckcraft_engine::cmd::smartart::selected);
+    let row = app.ui.smartart_row;
+    let (gid, n, kind) = match &sel {
+        Some((id, d)) => (Some(id.0), d.nodes.len(), d.kind.clone()),
+        None => (None, 0, String::new()),
+    };
+    let at = row.min(n.saturating_sub(1));
+    group(ui, |ui| {
+        if big_button(ui, Icon::SmartArt, "Text\nPane", gid.is_some()).on_hover_text("Type and organise the diagram's text").clicked() {
+            run(app, "view.pane", json!({"pane": "smartart", "toggle": true}));
+        }
+        rows(ui, |ui| {
+            let (r, _) = small_button_ex(ui, Icon::Plus, "Add Shape", gid.is_some(), false, true);
+            egui::Popup::menu(&r).show(|ui| {
+                for (label, pos) in
+                    [("Add Shape After", "after"), ("Add Shape Before", "before"), ("Add Shape Above", "above"), ("Add Shape Below", "below")]
+                {
+                    if ui.button(label).clicked() {
+                        let index = if n == 0 { Value::Null } else { json!(at) };
+                        run(app, "smartArt.addNode", json!({"id": gid, "index": index, "position": pos}));
+                    }
+                }
+            });
+            if small_button(ui, Icon::DecreaseIndent, "Promote", n > 0, false).clicked() {
+                run(app, "smartArt.promote", json!({"id": gid, "index": at}));
+            }
+            if small_button(ui, Icon::IncreaseIndent, "Demote", n > 0, false).clicked() {
+                run(app, "smartArt.demote", json!({"id": gid, "index": at}));
+            }
+        });
+    });
+    group(ui, |ui| {
+        let (r, _) = small_button_ex(ui, Icon::Layout, "Layout", gid.is_some(), false, true);
+        egui::Popup::menu(&r).show(|ui| {
+            for k in deckcraft_engine::cmd::smartart::KINDS {
+                let label = format!("{}{}", k[..1].to_uppercase(), &k[1..]);
+                if ui.selectable_label(kind == k, label).clicked() {
+                    run(app, "smartArt.layout", json!({"id": gid, "kind": k}));
+                }
+            }
+        });
+    });
+    arrange_group(app, ui);
+}
+
 fn playback(app: &mut SlideApp, ui: &mut Ui) {
     let m = app
         .session
diff --git a/crates/ui-egui/src/smartart_tests.rs b/crates/ui-egui/src/smartart_tests.rs
new file mode 100644
index 00000000..7692f704
--- /dev/null
+++ b/crates/ui-egui/src/smartart_tests.rs
@@ -0,0 +1,53 @@
+//! The SmartArt Text Pane driven like a person would: type in a line, Enter for a new line, Tab
+//! to demote.
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::{NodeT, Queryable};
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn levels(h: &Harness<'_, SlideApp>) -> Vec<(String, u8)> {
+    let st = h.state().session.active().unwrap();
+    let (_, d) = deckcraft_engine::cmd::smartart::selected(st).unwrap();
+    d.nodes.into_iter().map(|n| (n.text, n.level)).collect()
+}
+
+fn line<'a>(h: &'a Harness<'_, SlideApp>, v: &'a str) -> egui_kittest::Node<'a> {
+    h.get_all_by_value(v).find(|n| n.accesskit_node().role() == egui::accesskit::Role::TextInput).unwrap()
+}
+
+#[test]
+fn text_pane_types_adds_and_demotes() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.smartArt", &json!({"kind": "list", "items": ["Plan", "Build"]})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.pane = Some("smartart".into());
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    assert!(h.query_by_label("Text Pane").is_some());
+
+    line(&h, "Build").click();
+    h.run_steps(2);
+    h.key_press(egui::Key::End);
+    line(&h, "Build").type_text(" it");
+    h.run_steps(2);
+    h.key_press(egui::Key::Enter);
+    h.run_steps(4);
+    assert_eq!(levels(&h), [("Plan".into(), 0), ("Build it".into(), 0), (String::new(), 0)]);
+
+    // The new line has the focus: type, then Tab demotes it under "Build it".
+    h.event(egui::Event::Text("Test".into()));
+    h.run_steps(2);
+    h.key_press(egui::Key::Tab);
+    h.run_steps(4);
+    assert_eq!(levels(&h), [("Plan".into(), 0), ("Build it".into(), 0), ("Test".into(), 1)]);
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..d1427027 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -74,7 +74,7 @@ the round trip even though DeckCraft doesn't model it.
 | Tables with styles | yes | yes | |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
 | Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
-| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
+| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save (DeckCraft keeps its own outline in `.deckcraft` only) |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
 | Ink (`contentPart`) | yes | as a group of freeform lines | PowerPoint sees shapes, not ink |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..b737232c 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -150,11 +150,15 @@ Detail in [file-format-parity.md](file-format-parity.md).
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 
-### SmartArt is pre-drawn shapes only
-- **Evidence:** `crates/pptx/src/read/shapes.rs` reads SmartArt's drawing part as a group; no text
-  pane, no layout switching, the diagram data isn't regenerated.
+### SmartArt editing is shallow
+- **Evidence:** a SmartArt graphic inserted in DeckCraft keeps its outline (`Shape.diagram`) and
+  has a Text Pane, Add Shape (after, before, above, below), Promote, Demote, Remove and layout
+  switching between DeckCraft's six layouts (`crates/engine/src/cmd/smartart.rs`). But
+  `crates/pptx/src/read/shapes.rs` reads a PowerPoint diagram's drawing part as a plain group (no
+  outline, so no Text Pane), the outline isn't written to `.pptx` (`dgm` data), and there are six
+  layouts rather than PowerPoint's ~200.
 - **Impact:** editing a SmartArt diagram from PowerPoint breaks it.
-- **Estimate:** 10–16 h.
+- **Estimate:** 8–14 h.
 
 ### Animation Pane, effect count and preview
 Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a **beta blocker**.
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 2a3d450c..e251efae 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -9,7 +9,7 @@ The summary between `<!-- SUMMARY -->
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
+| P2 | 54 | 13 | 16 | 25 | 39% |
 
 | Area | Parity |
 |---|---|
@@ -24,7 +24,7 @@ The summary between `<!-- SUMMARY -->
 | Text | 80% |
 | Tables | 89% |
 | Charts | 65% |
-| SmartArt | 33% |
+| SmartArt | 50% |
 | Pictures | 48% |
 | Media | 67% |
 | Transitions | 92% |
@@ -177,7 +177,7 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Charts | Chart elements (title, legend, labels, axes, gridlines) | P1 | P |
 | Charts | Chart styles and colours | P2 | P |
 | SmartArt | Insert SmartArt (lists, processes, cycles, hierarchy) | P1 | P |
-| SmartArt | Text pane and layout switching | P2 | M |
+| SmartArt | Text pane and layout switching | P2 | P |
 | Pictures | Insert picture (PNG, JPEG, GIF, WebP, BMP, TIFF) | P0 | D |
 | Pictures | SVG pictures | P1 | M |
 | Pictures | Crop (and crop to shape, aspect ratio) | P0 | P |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..0c96188c 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -190,7 +190,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Text | 15 | 80% | ~62% | 18–30 | Font weights beyond Regular/Bold/Italic (#69), Tab in text boxes (#78), IME, true vertical CJK, dictionaries, AutoCorrect, thesaurus, equations (PR #55 open) | [localization-parity.md](localization-parity.md) |
 | Tables | 5 | 89% | ~75% | 3–6 | Draw table, borders and cell effects depth | [parity-checklist.md](parity-checklist.md) |
 | Charts | 7 | 65% | ~45% | 12–20 | Data grid editing, chart elements, the `chartex` types (waterfall, funnel, treemap, sunburst, histogram, box) | [parity-checklist.md](parity-checklist.md) |
-| SmartArt | 4 | 33% | ~25% | 10–16 | Text pane, layout switching, the diagram data model on save | [parity-checklist.md](parity-checklist.md) |
+| SmartArt | 4 | 50% | ~35% | 8–14 | PowerPoint diagrams editable (read their data model), the data model on save, more layouts | [parity-checklist.md](parity-checklist.md) |
 | Pictures | 7 | 48% | ~45% | 12–20 | SVG/EMF/WMF, clipboard paste on Windows/Linux (#53), artistic effects, remove background, compress | [file-format-parity.md](file-format-parity.md) |
 | Media | 4 | 67% | ~60% | 8–14 | WMA/WMV decode, record audio/screen, icons and 3-D models, playback options lost on PPTX round trip (#74) | [file-format-parity.md](file-format-parity.md) |
 | Transitions | 4 | 92% | ~80% | 4–8 | Transition sounds, 3-D transitions approximated in 2-D | [animation-parity.md](animation-parity.md) |

From ab6051894d55c9938f17582bf48bc80145405861 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:23:54 +0300
Subject: [PATCH 216/376] render: 3-D light rigs and materials; extrusion sides
 lit per side

---
 crates/render/src/bevel.rs   |  67 +++++--------
 crates/render/src/camera.rs  |  10 ++
 crates/render/src/extrude.rs |  93 +++++++++++++-----
 crates/render/src/lib.rs     |   4 +-
 crates/render/src/light.rs   | 184 +++++++++++++++++++++++++++++++++++
 docs/gaps.md                 |   9 +-
 6 files changed, 298 insertions(+), 69 deletions(-)
 create mode 100644 crates/render/src/light.rs

diff --git a/crates/render/src/bevel.rs b/crates/render/src/bevel.rs
index 36de1f05..854d3c77 100644
--- a/crates/render/src/bevel.rs
+++ b/crates/render/src/bevel.rs
@@ -14,11 +14,10 @@ use deckcraft_color::Rgba;
 use kurbo::{Affine, BezPath, Point, Rect};
 use vello_cpu::{Pixmap, RenderContext, peniko};
 
+use crate::light::Lighting;
+
 /// Longest side of the rasterised lighting, in pixels.
 const MAX_SIDE: f64 = 512.0;
-const AMBIENT: f64 = 0.453;
-const DIFFUSE: f64 = 0.731;
-const SPECULAR: f64 = 14.7;
 
 /// A top bevel: its width and height in points and its preset.
 #[derive(Clone, Debug, PartialEq)]
@@ -26,9 +25,8 @@ pub struct Bevel {
     pub w: f64,
     pub h: f64,
     pub preset: String,
-    /// Lit as measured (the three-point rig and matte material); other rigs and materials are not
-    /// drawn.
-    pub modelled: bool,
+    /// The light rig and material that light it.
+    pub lighting: Lighting,
 }
 
 /// The top bevel of 3-D XML kept from the file (`scene3d` + `sp3d`), when it has both a scene
@@ -39,8 +37,7 @@ pub fn from_raw(raw: &str) -> Option<Bevel> {
     }
     // A 3-D shape without a bevel still has its face lit: a bevel of no width.
     let Some(i) = raw.find("bevelT") else {
-        let b = Bevel { w: 0.0, h: 0.0, preset: "circle".into(), modelled: false };
-        return Some(Bevel { modelled: modelled(raw), ..b });
+        return Some(Bevel { w: 0.0, h: 0.0, preset: "circle".into(), lighting: Lighting::from_raw(raw) });
     };
     let tag = raw.get(i..)?;
     let tag = tag.get(..tag.find('>')?)?;
@@ -53,23 +50,11 @@ pub fn from_raw(raw: &str) -> Option<Bevel> {
     let emu = |name: &str| attr(name).and_then(|v| v.parse::<f64>().ok()).map(|v| v / 12700.0);
     let w = emu("w").unwrap_or(6.0).clamp(0.0, 2000.0);
     let h = emu("h").unwrap_or(6.0).clamp(0.0, 2000.0);
-    (w > 0.0).then(|| Bevel { w, h, preset: attr("prst").unwrap_or("circle").to_string(), modelled: modelled(raw) })
-}
-
-/// Whether the light rig and material (from anywhere in the XML: `a:lightRig rig=`,
-/// `prstMaterial=`) are the ones measured: the three-point rig, matte.
-fn modelled(raw: &str) -> bool {
-    let value_after = |key: &str| -> Option<&str> {
-        let s = raw.find(key)? + key.len();
-        let rest = raw.get(s..)?;
-        rest.get(..rest.find('"')?)
-    };
-    let rig = value_after("rig=\"").unwrap_or("threePt");
-    let material = value_after("prstMaterial=\"").unwrap_or("warmMatte");
-    rig == "threePt" && matches!(material, "warmMatte" | "matte")
+    (w > 0.0).then(|| Bevel { w, h, preset: attr("prst").unwrap_or("circle").to_string(), lighting: Lighting::from_raw(raw) })
 }
 
 /// The light, pointing from the surface towards it (x right, y down, z towards the viewer).
+#[cfg(test)]
 fn light() -> [f64; 3] {
     let (az, el) = (240f64.to_radians(), 45f64.to_radians());
     [el.cos() * az.cos(), el.cos() * az.sin(), el.sin()]
@@ -121,19 +106,16 @@ fn nearest_edge(polys: &[Vec<Point>], areas: &[f64], p: Point) -> Option<(f64, k
 /// inside `path` (shape space, laid out in `bounds`), `m` mapping it to the output.
 #[allow(clippy::too_many_arguments)]
 pub fn draw(ctx: &mut RenderContext, bevel: &Bevel, fill: Option<Rgba>, path: &BezPath, bounds: Rect, m: Affine, alpha: f64) {
-    // Other light rigs and materials light the face and band differently (brighter, darker,
-    // shinier); rather than guess, they stay flat as before.
-    if !bevel.modelled || bounds.width() <= 0.0 || bounds.height() <= 0.0 || !bounds.is_finite() {
+    let lit = &bevel.lighting;
+    if bounds.width() <= 0.0 || bounds.height() <= 0.0 || !bounds.is_finite() {
         return;
     }
     // No bevel: only the face, one lit colour (as PowerPoint lights a 3-D shape's front face,
     // whichever way the camera turns it, within about 10 levels).
     if bevel.w <= 0.0 {
         if let Some(c) = fill {
-            let f = AMBIENT + DIFFUSE * light()[2];
-            let ch = |v: u8| (v as f64 * f + SPECULAR).round().clamp(0.0, 255.0) as u8;
             ctx.set_transform(m);
-            ctx.set_paint(crate::color(Rgba::rgba(ch(c.r), ch(c.g), ch(c.b), c.a), alpha));
+            ctx.set_paint(crate::color(lit.shade(c, [0.0, 0.0, 1.0]), alpha));
             ctx.fill_path(path);
         }
         return;
@@ -148,30 +130,29 @@ pub fn draw(ctx: &mut RenderContext, bevel: &Bevel, fill: Option<Rgba>, path: &B
         return;
     }
     let areas: Vec<f64> = polys.iter().map(|p| p.windows(2).map(|w| w[0].x * w[1].y - w[1].x * w[0].y).sum::<f64>() / 2.0).collect();
-    let l = light();
-    let face = AMBIENT + DIFFUSE * l[2];
+    let face = lit.factor([0.0, 0.0, 1.0]);
     let ratio = if bevel.w > 0.0 { bevel.h / bevel.w } else { 0.0 };
     let a = alpha.clamp(0.0, 1.0);
     let mut data = Vec::with_capacity((pw * ph) as usize);
     for j in 0..ph {
         for i in 0..pw {
             let p = Point::new(bounds.x0 + (i as f64 + 0.5) / pw as f64 * bounds.width(), bounds.y0 + (j as f64 + 0.5) / ph as f64 * bounds.height());
-            let f = match nearest_edge(&polys, &areas, p) {
+            let n = match nearest_edge(&polys, &areas, p) {
                 Some((d, e)) if d < bevel.w => {
                     let z = slope(&bevel.preset, d / bevel.w) * ratio;
                     let n = [e.x * z, e.y * z, 1.0];
                     let len = (n[0] * n[0] + n[1] * n[1] + n[2] * n[2]).sqrt();
-                    let dot = (n[0] * l[0] + n[1] * l[1] + n[2] * l[2]) / len;
-                    AMBIENT + DIFFUSE * dot.max(0.0)
+                    [n[0] / len, n[1] / len, n[2] / len]
                 }
-                _ => face,
+                _ => [0.0, 0.0, 1.0],
             };
+            let f = lit.factor(n);
             let px = match fill {
                 Some(c) => {
-                    let ch = |v: u8| (v as f64 * f + SPECULAR).round().clamp(0.0, 255.0);
+                    let lc = lit.shade(c, n);
                     let ca = c.a as f64 * a / 255.0;
-                    let pm = |v: f64| (v * ca).round().clamp(0.0, 255.0) as u8;
-                    vello_cpu::color::PremulRgba8 { r: pm(ch(c.r)), g: pm(ch(c.g)), b: pm(ch(c.b)), a: (ca * 255.0).round() as u8 }
+                    let pm = |v: u8| (f64::from(v) * ca).round().clamp(0.0, 255.0) as u8;
+                    vello_cpu::color::PremulRgba8 { r: pm(lc.r), g: pm(lc.g), b: pm(lc.b), a: (ca * 255.0).round() as u8 }
                 }
                 None => {
                     // A veil: white where the band is lighter than the face, black where darker.
@@ -204,17 +185,19 @@ mod tests {
     #[test]
     fn bevels_are_read_from_kept_3d_xml() {
         let raw = r#"<a:scene3d><a:camera prst="orthographicFront"/></a:scene3d><a:sp3d><a:bevelT w="50800" h="16510" prst="angle"/></a:sp3d>"#;
-        assert_eq!(from_raw(raw), Some(Bevel { w: 4.0, h: 1.3, preset: "angle".into(), modelled: true }));
+        let b = from_raw(raw).unwrap();
+        assert_eq!((b.w, b.h, b.preset.as_str()), (4.0, 1.3, "angle"));
+        assert_eq!(b.lighting, Lighting::from_raw(raw));
         // Defaults: 6 pt square, circle.
         let raw = r#"<a:scene3d/><a:sp3d><a:bevelT/></a:sp3d>"#;
-        assert_eq!(from_raw(raw), Some(Bevel { w: 6.0, h: 6.0, preset: "circle".into(), modelled: true }));
-        // Another rig or material: not modelled.
+        assert!(from_raw(raw).is_some_and(|b| (b.w, b.h, b.preset.as_str()) == (6.0, 6.0, "circle")));
+        // Another rig or material is lit by it.
         let raw = r#"<a:scene3d><a:lightRig rig="flood" dir="t"/></a:scene3d><a:sp3d prstMaterial="metal"><a:bevelT/></a:sp3d>"#;
-        assert!(from_raw(raw).is_some_and(|b| !b.modelled));
+        assert!(from_raw(raw).is_some_and(|b| b.lighting.specular > 0.0));
         // No scene: flat in PowerPoint.
         assert_eq!(from_raw(r#"<a:sp3d><a:bevelT w="50800"/></a:sp3d>"#), None);
         // A 3-D shape with no bevel: a bevel of no width (its face is lit).
-        assert!(from_raw(r#"<a:scene3d/><a:sp3d extrusionH="10"/>"#).is_some_and(|b| b.w == 0.0 && b.modelled));
+        assert!(from_raw(r#"<a:scene3d/><a:sp3d extrusionH="10"/>"#).is_some_and(|b| b.w == 0.0));
         assert_eq!(from_raw(r#"<a:scene3d/>"#), None);
     }
 
diff --git a/crates/render/src/camera.rs b/crates/render/src/camera.rs
index 770b9445..af5187c9 100644
--- a/crates/render/src/camera.rs
+++ b/crates/render/src/camera.rs
@@ -119,6 +119,16 @@ fn project(c: &Camera, p: Point, size: f64) -> Point {
     project3(c, p.x, p.y, 0.0, size)
 }
 
+/// Direction `v` (shape space: x right, y down, z to the viewer) turned by camera `c`, without
+/// perspective: a surface normal as the camera sees it.
+pub fn rotate(c: &Camera, v: [f64; 3]) -> [f64; 3] {
+    let (a, b, r) = (c.lat.to_radians(), c.lon.to_radians(), -c.rev.to_radians());
+    let (x, y, z) = (v[0], v[1], v[2]);
+    let (x1, y1, z1) = (x * b.cos() + z * b.sin(), y, -x * b.sin() + z * b.cos());
+    let (x2, y2, z2) = (x1, y1 * a.cos() - z1 * a.sin(), y1 * a.sin() + z1 * a.cos());
+    [x2 * r.cos() - y2 * r.sin(), x2 * r.sin() + y2 * r.cos(), z2]
+}
+
 /// Where a point in the shape's space (relative to its centre; z towards the viewer, so an
 /// extrusion runs to negative z) lands.
 pub fn project3(c: &Camera, x: f64, y: f64, z: f64, size: f64) -> Point {
diff --git a/crates/render/src/extrude.rs b/crates/render/src/extrude.rs
index 4fdde0d5..9576bf60 100644
--- a/crates/render/src/extrude.rs
+++ b/crates/render/src/extrude.rs
@@ -1,10 +1,10 @@
 //! 3-D extrusion (`a:sp3d extrusionH`, `a:extrusionClr`) seen through a turned camera, drawn in
-//! 2-D: the shape's outline is swept from its back face to its front face along the camera's view
-//! of the depth axis, in the side colour, and the face is drawn on top as usual.
+//! 2-D: quads join the shape's outline on its front face to the same outline on its back face (the
+//! camera's view of the depth axis), and the face is drawn on top as usual.
 //!
-//! The sides are one shaded colour (the extrusion colour, or the fill's, darkened as a matte side
-//! facing away from the three-point rig's key light); PowerPoint shades each side by its own
-//! normal. Without a turned camera an extrusion points at the viewer and nothing of it shows.
+//! Each side (one quad per flattened outline edge) is lit for its own normal by the shape's light
+//! rig and material, and the sides are drawn farthest first. Without a turned camera an extrusion
+//! points at the viewer and nothing of it shows.
 
 use deckcraft_color::{Rgba, SchemeSlot};
 use deckcraft_model::ColorRef;
@@ -13,11 +13,10 @@ use kurbo::{Affine, BezPath, Vec2};
 use vello_cpu::RenderContext;
 
 use crate::camera::{self, Camera};
+use crate::light::Lighting;
 
-/// How much darker the sides are than the face colour.
-const SIDE_SHADE: f64 = 0.62;
-/// Most sweep steps (one per output pixel of depth up to this).
-const MAX_STEPS: usize = 96;
+/// Outlines with more edges than this (after flattening) are not extruded.
+const MAX_EDGES: usize = 4096;
 
 /// An extrusion: its depth in points and its own colour, if set.
 #[derive(Clone, Debug, PartialEq)]
@@ -68,27 +67,75 @@ pub fn back_offset(c: &Camera, depth: f64, w: f64, h: f64) -> Vec2 {
     camera::project3(c, 0.0, 0.0, -depth, size) - camera::project3(c, 0.0, 0.0, 0.0, size)
 }
 
-/// The side colour: the extrusion colour, or the face's, shaded.
+/// The side colour before lighting: the extrusion colour, or the face's.
 pub fn side_color(rctx: &Ctx, e: &Extrusion, face: Option<Rgba>) -> Rgba {
-    let base = e.color.as_ref().map(|c| rctx.color(c, face)).or(face).unwrap_or(Rgba::rgb(0x80, 0x80, 0x80));
-    let ch = |v: u8| (f64::from(v) * SIDE_SHADE).round().clamp(0.0, 255.0) as u8;
-    Rgba { r: ch(base.r), g: ch(base.g), b: ch(base.b), a: base.a }
+    e.color.as_ref().map(|c| rctx.color(c, face)).or(face).unwrap_or(Rgba::rgb(0x80, 0x80, 0x80))
 }
 
-/// Sweep `outline` (shape space) from its back face to its front face. `pre` maps the turned
-/// shape's space to the output and `turn` is the camera's turn, so the shape is drawn under
-/// `pre * turn` and its back face under `pre * translate(offset) * turn`.
-pub fn draw(ctx: &mut RenderContext, outline: &BezPath, pre: Affine, turn: Affine, offset: Vec2, side: Rgba) {
+/// Draw the sides of `outline` (shape space, `w` × `h`): one quad per edge between the front face
+/// and the back face, each lit by `lit` for its own normal as camera `cam` sees it, farthest first.
+/// `pre` maps the turned shape's space to the output and `turn` is the camera's turn.
+#[allow(clippy::too_many_arguments)]
+pub fn draw(
+    ctx: &mut RenderContext,
+    outline: &BezPath,
+    w: f64,
+    h: f64,
+    cam: &Camera,
+    depth: f64,
+    pre: Affine,
+    turn: Affine,
+    side: Rgba,
+    lit: &Lighting,
+) {
+    let offset = back_offset(cam, depth, w, h);
     let px = (pre * offset.to_point() - pre * kurbo::Point::ZERO).hypot();
     if !px.is_finite() || px < 0.25 {
         return;
     }
-    let steps = (px.ceil() as usize).clamp(1, MAX_STEPS);
-    ctx.set_paint(crate::color(side, 1.0));
-    for i in (0..steps).rev() {
-        let t = (i + 1) as f64 / steps as f64;
-        ctx.set_transform(pre * Affine::translate(offset * t) * turn);
-        ctx.fill_path(outline);
+    let polys = crate::pathgrad::polygons(outline);
+    let size = w.max(h);
+    let mut quads: Vec<(f64, BezPath, Rgba)> = vec![];
+    for poly in &polys {
+        if poly.len() > MAX_EDGES {
+            continue;
+        }
+        let area: f64 = poly.windows(2).map(|q| q[0].x * q[1].y - q[1].x * q[0].y).sum::<f64>() / 2.0;
+        for e in poly.windows(2) {
+            let (a, b) = (e[0], e[1]);
+            let d = b - a;
+            let len = d.hypot();
+            if len < 1e-9 {
+                continue;
+            }
+            // Outward normal in the shape's plane (as in the bevel), turned by the camera.
+            let n = kurbo::Vec2::new(d.y, -d.x) / len;
+            let n = if area > 0.0 { n } else { -n };
+            let vn = camera::rotate(cam, [n.x, n.y, 0.0]);
+            if vn[2] < -0.02 {
+                continue;
+            }
+            let mid = a.midpoint(b);
+            let z = camera::rotate(cam, [mid.x - w / 2.0, mid.y - h / 2.0, -depth / 2.0])[2];
+            let (fa, fb) = (turn * a, turn * b);
+            let mut q = BezPath::new();
+            q.move_to(fa);
+            q.line_to(fb);
+            q.line_to(fb + offset);
+            q.line_to(fa + offset);
+            q.close_path();
+            quads.push((z, q, lit.shade(side, vn)));
+        }
+    }
+    let _ = size;
+    quads.sort_by(|a, b| a.0.total_cmp(&b.0));
+    ctx.set_transform(pre);
+    for (_, q, c) in &quads {
+        ctx.set_paint(crate::color(*c, 1.0));
+        ctx.fill_path(q);
+        // Close the hairline seams between neighbouring quads.
+        ctx.set_stroke(kurbo::Stroke::new(0.6 / crate::scale_of(pre).max(1e-6)));
+        ctx.stroke_path(q);
     }
 }
 
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index 2eddf178..6f5faa38 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -12,6 +12,7 @@ mod camera;
 mod chart;
 mod colr;
 mod extrude;
+mod light;
 
 mod compound;
 mod extent;
@@ -939,7 +940,8 @@ impl Renderer {
                 _ => None,
             };
             let pre = m * turn.inverse();
-            extrude::draw(ctx, &outline, pre, turn, extrude::back_offset(&cam, ex.depth, w, h), extrude::side_color(rctx, &ex, face));
+            let lit = light::Lighting::from_raw(raw);
+            extrude::draw(ctx, &outline, w, h, &cam, ex.depth, pre, turn, extrude::side_color(rctx, &ex, face), &lit);
         }
         // Fill.
         match &s.kind {
diff --git a/crates/render/src/light.rs b/crates/render/src/light.rs
new file mode 100644
index 00000000..2d475dfe
--- /dev/null
+++ b/crates/render/src/light.rs
@@ -0,0 +1,184 @@
+//! Light rigs (`a:lightRig rig= dir=`) and materials (`a:sp3d prstMaterial=`) for 3-D shapes:
+//! how bright a surface is for its normal.
+//!
+//! The three-point rig with the matte material is fitted to PowerPoint's exports (see
+//! [`crate::bevel`]): `c · (0.453 + 0.731 · max(0, n · L)) + 14.7` with the key light from the upper
+//! left. The other rigs and materials are modelled on it, not measured: each rig is a set of
+//! directional lights with an ambient level and a colour tint, each material scales the diffuse
+//! and ambient terms and adds a specular highlight.
+
+use deckcraft_color::Rgba;
+
+/// A light rig and material: what lights a 3-D surface.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Lighting {
+    /// Unit directions from the surface towards each light (x right, y down, z to the viewer)
+    /// and their strengths.
+    pub lights: Vec<([f64; 3], f64)>,
+    pub ambient: f64,
+    pub diffuse: f64,
+    /// Added to every channel (the measured lift of the three-point rig).
+    pub lift: f64,
+    /// Colour of the light, per channel.
+    pub tint: [f64; 3],
+    pub specular: f64,
+    pub shininess: f64,
+    /// `flat`: no shading at all.
+    pub flat: bool,
+}
+
+fn dir(az: f64, el: f64) -> [f64; 3] {
+    let (az, el) = (az.to_radians(), el.to_radians());
+    [el.cos() * az.cos(), el.cos() * az.sin(), el.sin()]
+}
+
+fn value_after<'a>(raw: &'a str, key: &str) -> Option<&'a str> {
+    let s = raw.find(key)? + key.len();
+    let rest = raw.get(s..)?;
+    rest.get(..rest.find('"')?)
+}
+
+/// The rig's lights as (azimuth, elevation, strength), its ambient level and tint.
+fn rig(name: &str) -> (Vec<(f64, f64, f64)>, f64, [f64; 3]) {
+    const WHITE: [f64; 3] = [1.0, 1.0, 1.0];
+    match name {
+        "balanced" => (vec![(240.0, 40.0, 0.75), (300.0, 40.0, 0.35), (90.0, 30.0, 0.25)], 0.47, WHITE),
+        "soft" => (vec![(270.0, 60.0, 0.6)], 0.58, WHITE),
+        "harsh" => (vec![(225.0, 30.0, 1.15)], 0.3, WHITE),
+        "flood" => (vec![(270.0, 70.0, 0.8), (240.0, 40.0, 0.35)], 0.5, WHITE),
+        "contrasting" => (vec![(210.0, 30.0, 1.05), (30.0, 20.0, 0.3)], 0.33, WHITE),
+        "morning" => (vec![(240.0, 35.0, 0.9)], 0.45, [1.0, 0.95, 0.85]),
+        "sunrise" => (vec![(200.0, 20.0, 0.95)], 0.42, [1.0, 0.88, 0.75]),
+        "sunset" => (vec![(340.0, 20.0, 0.95)], 0.42, [1.0, 0.82, 0.7]),
+        "chilly" => (vec![(240.0, 45.0, 0.85)], 0.45, [0.88, 0.94, 1.0]),
+        "freezing" => (vec![(240.0, 45.0, 0.85)], 0.45, [0.8, 0.9, 1.0]),
+        "twoPt" => (vec![(225.0, 45.0, 0.8), (315.0, 45.0, 0.45)], 0.42, WHITE),
+        "glow" => (vec![(270.0, 85.0, 0.55)], 0.68, WHITE),
+        "brightRoom" => (vec![(270.0, 60.0, 0.45)], 0.75, WHITE),
+        // threePt and the legacy rigs.
+        _ => (vec![(240.0, 45.0, 1.0)], 0.453, WHITE),
+    }
+}
+
+/// The rig direction (`dir`) turns the lights about the view axis.
+fn dir_turn(d: &str) -> f64 {
+    match d {
+        "tr" => 45.0,
+        "r" => 90.0,
+        "br" => 135.0,
+        "b" => 180.0,
+        "bl" => 225.0,
+        "l" => 270.0,
+        "tl" => 315.0,
+        _ => 0.0,
+    }
+}
+
+impl Lighting {
+    /// The lighting of 3-D XML kept from the file; the three-point rig and warm matte material
+    /// when unset.
+    pub fn from_raw(raw: &str) -> Lighting {
+        let rig_name = value_after(raw, "rig=\"").unwrap_or("threePt");
+        let turn = dir_turn(value_after(raw, " dir=\"").unwrap_or("t"));
+        let material = value_after(raw, "prstMaterial=\"").unwrap_or("warmMatte");
+        let (lights, ambient, tint) = rig(rig_name);
+        let (dk, ak, specular, shininess) = match material {
+            "plastic" => (1.0, 1.0, 0.45, 24.0),
+            "metal" => (0.8, 0.9, 0.7, 40.0),
+            "softmetal" => (0.9, 0.95, 0.35, 12.0),
+            "powder" | "translucentPowder" => (0.85, 1.12, 0.0, 1.0),
+            "dkEdge" => (1.12, 0.8, 0.1, 8.0),
+            "softEdge" => (0.9, 1.08, 0.05, 6.0),
+            "clear" => (0.9, 1.0, 0.6, 50.0),
+            _ => (1.0, 1.0, 0.0, 1.0),
+        };
+        Lighting {
+            lights: lights.into_iter().map(|(az, el, s)| (dir(az + turn, el), s)).collect(),
+            ambient: ambient * ak,
+            diffuse: 0.731 * dk,
+            lift: 14.7,
+            tint,
+            specular,
+            shininess,
+            flat: rig_name == "flat" || material == "flat",
+        }
+    }
+
+    /// The diffuse brightness factor for unit normal `n` (the three-point matte rig: 0.453 +
+    /// 0.731 · max(0, n · L)).
+    pub fn factor(&self, n: [f64; 3]) -> f64 {
+        if self.flat {
+            return 1.0;
+        }
+        let dot = |l: &[f64; 3]| (n[0] * l[0] + n[1] * l[1] + n[2] * l[2]).max(0.0);
+        self.ambient + self.diffuse * self.lights.iter().map(|(l, s)| s * dot(l)).sum::<f64>()
+    }
+
+    /// The specular highlight (0–1) for unit normal `n`, seen from the front.
+    pub fn highlight(&self, n: [f64; 3]) -> f64 {
+        if self.flat || self.specular <= 0.0 {
+            return 0.0;
+        }
+        self.lights
+            .iter()
+            .map(|(l, s)| {
+                let h = [l[0], l[1], l[2] + 1.0];
+                let len = (h[0] * h[0] + h[1] * h[1] + h[2] * h[2]).sqrt().max(1e-9);
+                let d = ((n[0] * h[0] + n[1] * h[1] + n[2] * h[2]) / len).max(0.0);
+                s * d.powf(self.shininess)
+            })
+            .sum::<f64>()
+            * self.specular
+    }
+
+    /// Colour `c` lit on a surface with unit normal `n`.
+    pub fn shade(&self, c: Rgba, n: [f64; 3]) -> Rgba {
+        if self.flat {
+            return c;
+        }
+        let f = self.factor(n);
+        let hi = self.highlight(n) * 255.0;
+        let ch = |v: u8, t: f64| (f64::from(v) * f * t + self.lift + hi).round().clamp(0.0, 255.0) as u8;
+        Rgba::rgba(ch(c.r, self.tint[0]), ch(c.g, self.tint[1]), ch(c.b, self.tint[2]), c.a)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn three_point_matte_is_the_measured_formula() {
+        let l = Lighting::from_raw(r#"<a:lightRig rig="threePt" dir="t"/>"#);
+        let n = [0.0, 0.0, 1.0];
+        let expect = 0.453 + 0.731 * 45f64.to_radians().sin();
+        assert!((l.factor(n) - expect).abs() < 1e-9);
+        assert_eq!(l.highlight(n), 0.0);
+        let c = l.shade(Rgba::rgb(100, 100, 100), n);
+        assert_eq!(c.r, (100.0 * expect + 14.7_f64).round() as u8);
+    }
+
+    #[test]
+    fn rigs_and_materials_differ_as_named() {
+        let face = [0.0, 0.0, 1.0];
+        let f = |raw: &str| Lighting::from_raw(raw).factor(face);
+        assert!(f(r#"rig="brightRoom""#) > f(r#"rig="threePt""#), "a bright room is brighter");
+        assert!(f(r#"rig="harsh""#) < f(r#"rig="soft""#) + 0.2);
+        assert_eq!(Lighting::from_raw(r#"rig="flat""#).shade(Rgba::rgb(10, 20, 30), face), Rgba::rgb(10, 20, 30));
+        // Metal shines where plastic shines less and matte not at all.
+        let up_left = {
+            let d = dir(240.0, 45.0);
+            let h = [d[0], d[1], d[2] + 1.0];
+            let l = (h[0] * h[0] + h[1] * h[1] + h[2] * h[2]).sqrt();
+            [h[0] / l, h[1] / l, h[2] / l]
+        };
+        let hi = |m: &str| Lighting::from_raw(&format!(r#"prstMaterial="{m}""#)).highlight(up_left);
+        assert!(hi("metal") > hi("plastic") && hi("plastic") > 0.0 && hi("matte") == 0.0);
+        // Turning the rig to the right moves the key light: a right-facing surface gets brighter.
+        let right = [0.7, 0.0, 0.7];
+        assert!(Lighting::from_raw(r#"rig="threePt" dir="r""#).factor(right) > Lighting::from_raw(r#"rig="threePt" dir="t""#).factor(right));
+        // Sunset is warm.
+        let warm = Lighting::from_raw(r#"rig="sunset""#).shade(Rgba::rgb(200, 200, 200), face);
+        assert!(warm.r > warm.b);
+    }
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index 7a453409..f0ded9aa 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -170,9 +170,11 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
   command to apply one, no adjust handles, and arc/circle placement can differ from PowerPoint by
   1–3 % of the path length), "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting
   render as approximations and `scene3d`/`sp3d` round-trip as raw XML; extrusions draw their
-  sides, in one shaded colour, under turned cameras; only the three-point rig, and no command or pane to apply 3-D).
-- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
-  rigs and materials, Format Shape page).
+  sides under turned cameras, each lit for its own normal; the preset light rigs, rig directions and
+  materials shade bevels and sides approximately (fitted to PowerPoint for three-point/matte only); no contours,
+  and no command or pane to apply 3-D).
+- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 2–4 h (3-D contours and
+  rig/material fidelity), plus the Format Shape page.
 
 ### Proofing: spelling, thesaurus, AutoCorrect
 - **Evidence:** `review.spelling` checks a small built-in list of frequent misspellings
@@ -256,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | 3-D light rigs and materials; extrusion sides lit per side |
 | 2026-10-14 | trivial | 3-D extrusions draw their sides under turned cameras |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |

From 210df9a3d1f9aa9ae99a023ba8c65e4371d789f2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:23:54 +0300
Subject: [PATCH 217/376] Charts: keep and draw region map charts

Read the regionMap chartEx layout as a RegionMap chart (regions and
their colour values), write the part back as read while unchanged, and
when edited rebuild it with the original geography (projection, culture
and cached boundaries) carried over. With no map data in the repo, the
renderer draws each region as a value-coloured tile with a colour scale
and a note that the map itself is not drawn.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/model/src/chart.rs       |  6 ++-
 crates/pptx/src/read/chartex.rs |  6 +--
 crates/pptx/src/write/chart.rs  | 59 ++++++++++++++++++++-
 crates/render/src/chart.rs      |  5 +-
 crates/render/src/chartex.rs    | 91 +++++++++++++++++++++++++++++++++
 crates/render/src/tests.rs      | 31 +++++++++++
 docs/file-format-parity.md      |  2 +-
 docs/gaps.md                    |  5 +-
 8 files changed, 194 insertions(+), 11 deletions(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index 54e28dcd..5b646f53 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -34,6 +34,9 @@ pub enum ChartType {
     Funnel,
     Treemap,
     Sunburst,
+    /// A filled (choropleth) map of regions coloured by value, kept and drawn from its data; it
+    /// is not offered in the chart menus (PowerPoint needs an online map service to make one).
+    RegionMap,
     Combo,
 }
 
@@ -51,7 +54,7 @@ impl ChartType {
 
     /// Whether the type is saved as a `chartEx` part (with a plain chart as the fallback).
     pub fn is_chartex(self) -> bool {
-        Self::OFFICE_2016.contains(&self)
+        Self::OFFICE_2016.contains(&self) || self == ChartType::RegionMap
     }
 
     pub const MAIN: [ChartType; 12] = [
@@ -96,6 +99,7 @@ impl ChartType {
             ChartType::Funnel => "Funnel",
             ChartType::Treemap => "Treemap",
             ChartType::Sunburst => "Sunburst",
+            ChartType::RegionMap => "Map",
             ChartType::Combo => "Combo",
         }
     }
diff --git a/crates/pptx/src/read/chartex.rs b/crates/pptx/src/read/chartex.rs
index 339d26c3..d8f3e9ce 100644
--- a/crates/pptx/src/read/chartex.rs
+++ b/crates/pptx/src/read/chartex.rs
@@ -66,12 +66,12 @@ fn kind_of(layout: &str) -> Option<ChartType> {
         "sunburst" => ChartType::Sunburst,
         "clusteredColumn" => ChartType::Histogram,
         "boxWhisker" => ChartType::BoxWhisker,
+        "regionMap" => ChartType::RegionMap,
         _ => return None,
     })
 }
 
-/// Parse a `chartEx` part. `None` for anything else, and for layouts DeckCraft has no type
-/// for (region maps).
+/// Parse a `chartEx` part. `None` for anything else, and for layouts DeckCraft has no type for.
 pub fn read_chartex_xml(bytes: &[u8]) -> Option<Chart> {
     let doc = crate::xml::parse(bytes).ok()?;
     let mut root = doc.root;
@@ -110,7 +110,7 @@ pub(crate) fn chartex_from(root: &El) -> Option<Chart> {
         });
         let d = datas.get(s.child("dataId").and_then(|i| i.attr("val")).unwrap_or("0"))?;
         let (values, format) =
-            ["val", "size"].iter().find_map(|t| d.numbers.get(*t)).or_else(|| d.numbers.values().next()).cloned().unwrap_or_default();
+            ["val", "size", "colorVal"].iter().find_map(|t| d.numbers.get(*t)).or_else(|| d.numbers.values().next()).cloned().unwrap_or_default();
         if c.categories.is_empty() {
             c.categories = d.categories.clone();
             c.category_levels = d.levels.clone();
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index e0e3743e..7b8c1718 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -534,6 +534,18 @@ fn cx_level(w: &mut W, pts: &[String], format: Option<&str>) {
     w.close("cx:lvl");
 }
 
+/// The `cx:layoutPr` of the region map series in a kept `chartEx` part.
+fn kept_region_layout(raw: &str) -> Option<String> {
+    let doc = crate::xml::parse(raw.as_bytes()).ok()?;
+    let mut root = doc.root;
+    crate::read::resolve_mc(&mut root, 0);
+    let region = root.child("chart")?.child("plotArea")?.child("plotAreaRegion")?;
+    let s = region.children_named("series").find(|s| s.attr("layoutId") == Some("regionMap"))?;
+    let lp = s.child("layoutPr")?;
+    // Written under our `cx` prefix; a part that bound chartex to another prefix is not copied.
+    lp.name.starts_with("cx:").then(|| lp.to_xml())
+}
+
 /// Writes an Office 2016 chart from the model, as PowerPoint lays the part out: one `cx:data`
 /// per series (categories and values), then the plot area with each series' layout, the axes
 /// the layout uses, the title and the legend.
@@ -551,7 +563,11 @@ pub fn build_chartex(c: &Chart) -> Vec<u8> {
             }
             w.close("cx:strDim");
         }
-        let ty = if matches!(c.kind, ChartType::Treemap | ChartType::Sunburst) { "size" } else { "val" };
+        let ty = match c.kind {
+            ChartType::Treemap | ChartType::Sunburst => "size",
+            ChartType::RegionMap => "colorVal",
+            _ => "val",
+        };
         w.open("cx:numDim", A::new().a("type", ty));
         let vals: Vec<String> = s.values.iter().map(|v| v.map(fmt_num).unwrap_or_default()).collect();
         cx_level(&mut w, &vals, Some(s.number_format.as_deref().unwrap_or("General")));
@@ -573,6 +589,7 @@ pub fn build_chartex(c: &Chart) -> Vec<u8> {
         ChartType::Treemap => "treemap",
         ChartType::Sunburst => "sunburst",
         ChartType::BoxWhisker => "boxWhisker",
+        ChartType::RegionMap => "regionMap",
         _ => "clusteredColumn",
     };
     let one = !matches!(c.kind, ChartType::BoxWhisker);
@@ -612,6 +629,13 @@ pub fn build_chartex(c: &Chart) -> Vec<u8> {
                 w.empty("cx:statistics", A::new().a("quartileMethod", if c.inclusive_quartiles { "inclusive" } else { "exclusive" }));
                 w.close("cx:layoutPr");
             }
+            ChartType::RegionMap => {
+                // The map's geography (projection, region level and the cached boundaries
+                // PowerPoint downloaded) is not modelled: carry it over from the part we read.
+                if let Some(lp) = c.raw.as_deref().and_then(kept_region_layout) {
+                    w.raw(&lp);
+                }
+            }
             _ => {}
         }
         w.close("cx:series");
@@ -622,7 +646,7 @@ pub fn build_chartex(c: &Chart) -> Vec<u8> {
         w.close("cx:series");
     }
     w.close("cx:plotAreaRegion");
-    if !matches!(c.kind, ChartType::Treemap | ChartType::Sunburst) {
+    if !matches!(c.kind, ChartType::Treemap | ChartType::Sunburst | ChartType::RegionMap) {
         w.open("cx:axis", A::new().a("id", "0"));
         w.empty("cx:catScaling", A::new().a("gapWidth", if matches!(c.kind, ChartType::Histogram | ChartType::Pareto) { "0" } else { "0.5" }));
         w.empty0("cx:tickLabels");
@@ -652,3 +676,34 @@ pub fn build_chartex(c: &Chart) -> Vec<u8> {
     w.close("cx:chartSpace");
     w.finish()
 }
+
+#[cfg(test)]
+mod region_map_tests {
+    use super::*;
+
+    /// A region map part as PowerPoint writes it (our own numbers; the cached geography is a
+    /// stand-in blob).
+    const MAP: &str = r#"<cx:chartSpace xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:cx="http://schemas.microsoft.com/office/drawing/2014/chartex"><cx:chartData><cx:data id="0"><cx:strDim type="cat"><cx:f>Sheet1!$A$2:$A$4</cx:f><cx:lvl ptCount="3"><cx:pt idx="0">Minsk</cx:pt><cx:pt idx="1">Brest</cx:pt><cx:pt idx="2">Gomel</cx:pt></cx:lvl></cx:strDim><cx:numDim type="colorVal"><cx:f>Sheet1!$B$2:$B$4</cx:f><cx:lvl ptCount="3" formatCode="General"><cx:pt idx="0">12</cx:pt><cx:pt idx="1">5</cx:pt><cx:pt idx="2">8</cx:pt></cx:lvl></cx:numDim></cx:data></cx:chartData><cx:chart><cx:title pos="t" align="ctr" overlay="0"/><cx:plotArea><cx:plotAreaRegion><cx:series layoutId="regionMap" uniqueId="{00000000-0000-4000-8000-000000000001}"><cx:tx><cx:txData><cx:f>Sheet1!$B$1</cx:f><cx:v>Sales</cx:v></cx:txData></cx:tx><cx:dataId val="0"/><cx:layoutPr><cx:geography cultureLanguage="en-US" cultureRegion="BY" attribution="Powered by Bing"><cx:geoCache provider="{E9337A44-BEBE-4D9F-B70C-5C5E7DAFC167}"><cx:binary>ZGVja2NyYWZ0LXRlc3Q=</cx:binary></cx:geoCache></cx:geography></cx:layoutPr></cx:series></cx:plotAreaRegion></cx:plotArea><cx:legend pos="r" align="min" overlay="0"/></cx:chart></cx:chartSpace>"#;
+
+    #[test]
+    fn region_maps_keep_their_geography_through_save_and_edit() {
+        let c = crate::read::read_chartex_xml(MAP.as_bytes()).expect("a region map is read");
+        assert_eq!(c.kind, ChartType::RegionMap);
+        assert_eq!(c.categories, ["Minsk", "Brest", "Gomel"]);
+        assert_eq!(c.series.first().map(|s| s.values.clone()), Some(vec![Some(12.0), Some(5.0), Some(8.0)]));
+        // Unchanged: written back as read.
+        let kept = String::from_utf8(chartex_xml(&c).unwrap_or_default()).unwrap_or_default();
+        assert!(kept.contains("ZGVja2NyYWZ0LXRlc3Q=") && kept.contains("cultureRegion=\"BY\""), "{kept}");
+        // Edited: rebuilt from the model, with the geography carried over.
+        let mut e = c.clone();
+        if let Some(s) = e.series.first_mut() {
+            s.values[1] = Some(20.0);
+        }
+        let built = String::from_utf8(chartex_xml(&e).unwrap_or_default()).unwrap_or_default();
+        assert!(built.contains("<cx:geoCache") && built.contains("ZGVja2NyYWZ0LXRlc3Q=") && built.contains("colorVal"), "{built}");
+        assert!(!built.contains("<cx:axis"), "{built}");
+        let back = crate::read::read_chartex_xml(built.as_bytes()).expect("the rebuilt part reads");
+        assert_eq!(back.kind, ChartType::RegionMap);
+        assert_eq!(back.series.first().and_then(|s| s.values.get(1).copied().flatten()), Some(20.0));
+    }
+}
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index 5cfeb691..140462b8 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -180,7 +180,8 @@ fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64,
     } else if matches!(c.kind, ChartType::Treemap | ChartType::Sunburst) {
         // A hierarchy's legend names its top-level groups.
         c.category_tree().iter().enumerate().map(|(i, n)| (n.name.clone(), series_color(rctx, c, i))).collect()
-    } else if c.kind == ChartType::Funnel {
+    } else if matches!(c.kind, ChartType::Funnel | ChartType::RegionMap) {
+        // A map draws its own colour scale.
         vec![]
     } else if pie {
         c.categories.iter().enumerate().map(|(i, n)| (n.clone(), series_color(rctx, c, i))).collect()
@@ -274,7 +275,7 @@ fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64,
         }
         return;
     }
-    if matches!(c.kind, ChartType::Funnel | ChartType::Treemap | ChartType::Sunburst) {
+    if matches!(c.kind, ChartType::Funnel | ChartType::Treemap | ChartType::Sunburst | ChartType::RegionMap) {
         crate::chartex::draw(ctx, rctx, c, m, area, base, text_col);
         return;
     }
diff --git a/crates/render/src/chartex.rs b/crates/render/src/chartex.rs
index 9e988351..e62105e8 100644
--- a/crates/render/src/chartex.rs
+++ b/crates/render/src/chartex.rs
@@ -15,6 +15,10 @@ use crate::color;
 /// Draw `c` inside `area` (the space left by the title and legend).
 pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rect, base: f64, text_col: Rgba) {
     let Some(s) = c.series.first() else { return };
+    if c.kind == ChartType::RegionMap {
+        region_tiles(ctx, rctx, c, m, area, base, text_col);
+        return;
+    }
     let vals: Vec<f64> = s.values.iter().map(|v| v.unwrap_or(0.0).max(0.0)).collect();
     if vals.iter().all(|v| *v <= 0.0) {
         return;
@@ -64,6 +68,93 @@ fn funnel(
     }
 }
 
+/// Mix `a` towards `b` by `t` (0..1).
+fn mix(a: Rgba, b: Rgba, t: f64) -> Rgba {
+    let t = t.clamp(0.0, 1.0);
+    let f = |x: u8, y: u8| (x as f64 + (y as f64 - x as f64) * t).round().clamp(0.0, 255.0) as u8;
+    Rgba::rgb(f(a.r, b.r), f(a.g, b.g), f(a.b, b.b))
+}
+
+/// A region map without its geography: the boundaries PowerPoint caches come from an online
+/// map service in an undocumented format and DeckCraft ships no map data, so each region is a
+/// tile in a grid, coloured on the map's value scale, with the scale below and a note saying
+/// the map itself is not drawn.
+fn region_tiles(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rect, base: f64, text_col: Rgba) {
+    let Some(s) = c.series.first() else { return };
+    let regions: Vec<(String, Option<f64>)> =
+        c.categories.iter().enumerate().map(|(i, n)| (n.clone(), s.values.get(i).copied().flatten())).filter(|(n, _)| !n.is_empty()).collect();
+    let note_h = base * 1.4;
+    let scale_h = base * 2.6;
+    let grid = Rect::new(area.x0, area.y0, area.x1, (area.y1 - note_h - scale_h).max(area.y0));
+    let hi = series_color(rctx, c, 0);
+    let lo = mix(hi, Rgba::WHITE, 0.85);
+    let (min, max) = regions.iter().filter_map(|(_, v)| *v).fold((f64::MAX, f64::MIN), |(a, b), v| (a.min(v), b.max(v)));
+    let span = if max > min { max - min } else { 1.0 };
+    let n = regions.len();
+    if n > 0 && grid.area() > 0.0 {
+        // Columns so that tiles come out about twice as wide as tall.
+        let aspect = grid.width() / grid.height().max(1.0);
+        let cols = ((n as f64 * aspect / 2.0).sqrt().ceil() as usize).clamp(1, n);
+        let rows = n.div_ceil(cols).max(1);
+        let (tw, th) = (grid.width() / cols as f64, grid.height() / rows as f64);
+        for (i, (name, v)) in regions.iter().enumerate() {
+            let (col, row) = (i % cols, i / cols);
+            let t = Rect::new(grid.x0 + tw * col as f64, grid.y0 + th * row as f64, grid.x0 + tw * (col + 1) as f64, grid.y0 + th * (row + 1) as f64)
+                .inset(-1.5);
+            let fill = v.map_or(Rgba::rgb(0xD9, 0xD9, 0xD9), |v| mix(lo, hi, (v - min) / span));
+            ctx.set_transform(m);
+            ctx.set_paint(color(fill, 1.0));
+            ctx.fill_rect(&t);
+            let dark = v.is_some_and(|v| (v - min) / span > 0.55);
+            let mut text = name.clone();
+            if c.data_labels
+                && let Some(v) = v
+            {
+                text = format!(
+                    "{text}
+{}",
+                    c.data_label(s, *v)
+                );
+            }
+            let inner = t.inset(-base * 0.25);
+            if inner.width() > base && inner.height() > base * 0.8 {
+                label(ctx, rctx, m, &text, inner, base * 0.9, Align::Center, Anchor::Middle, if dark { Rgba::WHITE } else { text_col }, false);
+            }
+        }
+    }
+    // The colour scale: a gradient bar from the lowest to the highest value.
+    if min <= max {
+        let bar_w = (area.width() * 0.5).min(base * 24.0);
+        let y = grid.y1 + base * 0.6;
+        let bar = Rect::new(area.center().x - bar_w / 2.0, y, area.center().x + bar_w / 2.0, y + base * 0.8);
+        let steps = 48;
+        for k in 0..steps {
+            let x0 = bar.x0 + bar.width() * k as f64 / steps as f64;
+            let x1 = bar.x0 + bar.width() * (k + 1) as f64 / steps as f64 + 0.5;
+            ctx.set_transform(m);
+            ctx.set_paint(color(mix(lo, hi, k as f64 / (steps - 1) as f64), 1.0));
+            ctx.fill_rect(&Rect::new(x0, bar.y0, x1.min(bar.x1), bar.y1));
+        }
+        let ly = Rect::new(bar.x0 - base * 8.0, bar.y0 - base * 0.2, bar.x0 - base * 0.4, bar.y1 + base * 0.2);
+        label(ctx, rctx, m, &c.data_label(s, min), ly, base, Align::Right, Anchor::Middle, text_col, false);
+        let ry = Rect::new(bar.x1 + base * 0.4, bar.y0 - base * 0.2, bar.x1 + base * 8.0, bar.y1 + base * 0.2);
+        label(ctx, rctx, m, &c.data_label(s, max), ry, base, Align::Left, Anchor::Middle, text_col, false);
+    }
+    let note = Rect::new(area.x0, area.y1 - note_h, area.x1, area.y1);
+    label(
+        ctx,
+        rctx,
+        m,
+        "Map preview unavailable: regions shown as tiles",
+        note,
+        base * 0.85,
+        Align::Center,
+        Anchor::Middle,
+        mix(text_col, Rgba::WHITE, 0.4),
+        false,
+    );
+}
+
 /// Squarified treemap (Bruls, Huizing, van Wijk): rows of tiles laid along the short side,
 /// each row kept while it improves the worst aspect ratio.
 pub fn squarify(vals: &[f64], r: Rect) -> Vec<Rect> {
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index f36adad1..28fe9887 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1803,3 +1803,34 @@ fn multilevel_treemap_and_sunburst_draw_their_groups() {
         assert!(seen.len() >= 6, "{kind:?}: {} colours", seen.len());
     }
 }
+
+/// A region map without drawable geography falls back to coloured tiles on the value scale.
+#[test]
+fn region_map_draws_tiles_on_its_colour_scale() {
+    let names = ["Brest", "Vitebsk", "Gomel", "Grodno", "Minsk", "Mogilev", "Minsk City"];
+    let vals = [3.1, 2.2, 2.9, 4.8, 6.0, 1.4, 9.5];
+    let c = Chart {
+        kind: ChartType::RegionMap,
+        title: Some("Sales by region".into()),
+        categories: names.iter().map(|s| s.to_string()).collect(),
+        series: vec![deckcraft_model::chart::Series { name: "Sales".into(), values: vals.iter().map(|v| Some(*v)).collect(), ..Default::default() }],
+        data_labels: true,
+        ..Default::default()
+    };
+    let sh = Shape { id: ShapeId(624), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
+    let img = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    if let Ok(dir) = std::env::var("DECKCRAFT_CHART_SHOTS") {
+        let _ = std::fs::write(format!("{dir}/RegionMap-tiles.png"), img.to_png());
+    }
+    let mut seen: Vec<[u8; 3]> = Vec::new();
+    for y in (60..520).step_by(6) {
+        for x in (40..920).step_by(6) {
+            let p = img.pixel(x, y);
+            let c = [p[0] / 16, p[1] / 16, p[2] / 16];
+            if c != [15, 15, 15] && !seen.contains(&c) {
+                seen.push(c);
+            }
+        }
+    }
+    assert!(seen.len() >= 5, "{} colours", seen.len());
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 2fdebd52..ea9a6339 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -73,7 +73,7 @@ the round trip even though DeckCraft doesn't model it.
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
-| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept; edited and new ones written from the model with a plain-chart fallback. Treemap and sunburst hierarchy levels kept; no region maps |
+| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept; edited and new ones written from the model with a plain-chart fallback. Treemap and sunburst hierarchy levels kept; region maps kept, drawn as tiles (no map geometry) |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
diff --git a/docs/gaps.md b/docs/gaps.md
index 1d57e9ca..85dae7b9 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -150,8 +150,9 @@ Detail in [file-format-parity.md](file-format-parity.md).
   written from the model, with a plain chart fallback). Waterfalls float and total, funnels,
   treemaps (squarified, nested by level with group banners) and sunbursts (one ring per level)
   have their own layouts, histograms and Paretos bin their data (count, width or Scott's rule),
-  and box & whisker charts use exclusive or inclusive quartiles with 1.5 IQR whiskers. Region maps
-  remain.
+  and box & whisker charts use exclusive or inclusive quartiles with 1.5 IQR whiskers. Region maps are kept
+  (their cached geography too, also through edits) and drawn as value-coloured tiles with a
+  colour scale, since DeckCraft ships no map boundaries.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 

From ad7af605107a9137dcc2cfc7b8cc21805d51e762 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:29:23 +0300
Subject: [PATCH 218/376] render: 3-D contours

---
 crates/render/src/extrude.rs | 59 ++++++++++++++++++++++++++++--------
 crates/render/src/lib.rs     | 11 +++++++
 crates/render/src/tests.rs   | 24 +++++++++++++--
 docs/gaps.md                 |  9 +++---
 4 files changed, 84 insertions(+), 19 deletions(-)

diff --git a/crates/render/src/extrude.rs b/crates/render/src/extrude.rs
index 9576bf60..08369f48 100644
--- a/crates/render/src/extrude.rs
+++ b/crates/render/src/extrude.rs
@@ -44,22 +44,55 @@ pub fn from_raw(raw: &str) -> Option<Extrusion> {
     if !(depth.is_finite() && depth > 0.01) {
         return None;
     }
-    let color = raw.find("extrusionClr").and_then(|j| {
-        let body = raw.get(j..)?;
-        let body = body.get(..body.find("/a:extrusionClr").or_else(|| body.find("/extrusionClr")).unwrap_or(body.len()))?;
-        if let Some(k) = body.find("srgbClr ") {
-            let v = attr(body.get(k..)?, "val")?;
-            let n = u32::from_str_radix(v, 16).ok()?;
-            Some(ColorRef::rgb(Rgba::rgb((n >> 16) as u8, (n >> 8) as u8, n as u8)))
-        } else if let Some(k) = body.find("schemeClr ") {
-            SchemeSlot::from_xml(attr(body.get(k..)?, "val")?).map(ColorRef::scheme)
-        } else {
-            None
-        }
-    });
+    let color = color_in(raw, "extrusionClr");
     Some(Extrusion { depth: depth.min(4000.0), color })
 }
 
+/// The colour in the first `<a:{name}>` element of `raw` (an `srgbClr` or a `schemeClr`).
+fn color_in(raw: &str, name: &str) -> Option<ColorRef> {
+    let j = raw.find(&format!("{name}>"))?;
+    let body = raw.get(j..)?;
+    let end = body.find(&format!("/a:{name}")).or_else(|| body.find(&format!("/{name}"))).unwrap_or(body.len());
+    let body = body.get(..end)?;
+    if let Some(k) = body.find("srgbClr ") {
+        let v = attr(body.get(k..)?, "val")?;
+        let n = u32::from_str_radix(v, 16).ok()?;
+        Some(ColorRef::rgb(Rgba::rgb((n >> 16) as u8, (n >> 8) as u8, n as u8)))
+    } else if let Some(k) = body.find("schemeClr ") {
+        SchemeSlot::from_xml(attr(body.get(k..)?, "val")?).map(ColorRef::scheme)
+    } else {
+        None
+    }
+}
+
+/// A 3-D contour: a band of `width` points around the shape's outline (`a:sp3d contourW`,
+/// `a:contourClr`), drawn behind the face so only its outer half shows past the outline.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Contour {
+    pub width: f64,
+    pub color: Option<ColorRef>,
+}
+
+/// The contour in 3-D XML kept from the file, if it has one.
+pub fn contour_from_raw(raw: &str) -> Option<Contour> {
+    let i = raw.find("sp3d ")?;
+    let tag = raw.get(i..)?;
+    let tag = tag.get(..tag.find('>')?)?;
+    let width = attr(tag, "contourW")?.parse::<f64>().ok()? / 12700.0;
+    if !(width.is_finite() && width > 0.01) {
+        return None;
+    }
+    Some(Contour { width: width.min(2000.0), color: color_in(raw, "contourClr") })
+}
+
+/// Draw `c` around `outline` (shape space, mapped by `m`), lit as a surface facing the viewer.
+pub fn draw_contour(ctx: &mut RenderContext, outline: &BezPath, m: Affine, width: f64, color: Rgba, lit: &Lighting) {
+    ctx.set_transform(m);
+    ctx.set_paint(crate::color(lit.shade(color, [0.0, 0.0, 1.0]), 1.0));
+    ctx.set_stroke(kurbo::Stroke::new(2.0 * width).with_join(kurbo::Join::Round));
+    ctx.stroke_path(outline);
+}
+
 /// The camera's view of the depth axis: where the back face sits relative to the front face, in
 /// the turned shape's space (the space `camera::affine` maps into).
 pub fn back_offset(c: &Camera, depth: f64, w: f64, h: f64) -> Vec2 {
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index 6f5faa38..fee85f02 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -943,6 +943,17 @@ impl Renderer {
             let lit = light::Lighting::from_raw(raw);
             extrude::draw(ctx, &outline, w, h, &cam, ex.depth, pre, turn, extrude::side_color(rctx, &ex, face), &lit);
         }
+        // A 3-D contour: a band around the outline, behind the face (and in front of any sides).
+        if let Some(raw) = effects.as_ref().and_then(|e| e.raw3d.as_deref())
+            && let Some(c) = extrude::contour_from_raw(raw)
+        {
+            let face = match &fill {
+                Some(Fill::Solid { color: col }) => Some(rctx.color(col, fill_ph)),
+                _ => None,
+            };
+            let col = c.color.as_ref().map(|k| rctx.color(k, face)).or(face).unwrap_or(Rgba::rgb(0xff, 0xff, 0xff));
+            extrude::draw_contour(ctx, &outline, m, c.width, col, &light::Lighting::from_raw(raw));
+        }
         // Fill.
         match &s.kind {
             ShapeKind::Picture { fill: pf } => {
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 4df0a6ea..4f05768a 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1733,7 +1733,7 @@ fn extruded_deck() -> Presentation {
             701,
             280.0,
             "ellipse",
-            r#"<a:scene3d><a:camera prst="isometricTopUp"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="254000"><a:extrusionClr><a:srgbClr val="C00000"/></a:extrusionClr></a:sp3d>"#,
+            r#"<a:scene3d><a:camera prst="isometricTopUp"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="254000" contourW="63500"><a:extrusionClr><a:srgbClr val="C00000"/></a:extrusionClr><a:contourClr><a:srgbClr val="FFC000"/></a:contourClr></a:sp3d>"#,
         ),
         mk(
             702,
@@ -1745,11 +1745,31 @@ fn extruded_deck() -> Presentation {
             703,
             760.0,
             "rect",
-            r#"<a:scene3d><a:camera prst="orthographicFront"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="381000"/>"#,
+            r#"<a:scene3d><a:camera prst="orthographicFront"/><a:lightRig rig="threePt" dir="t"/></a:scene3d><a:sp3d extrusionH="381000" contourW="76200" prstMaterial="metal"><a:contourClr><a:srgbClr val="00B050"/></a:contourClr></a:sp3d>"#,
         ),
     ])
 }
 
+#[test]
+fn contours_band_the_outline_in_their_colour() {
+    let img = render_slide(&extruded_deck(), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    let n = |x0: u32, x1: u32, f: &dyn Fn([u8; 4]) -> bool| {
+        let mut k = 0;
+        for y in 0..img.height {
+            for x in x0..x1.min(img.width) {
+                let i = ((y * img.width + x) * 4) as usize;
+                if img.pixels.get(i..i + 4).and_then(|p| <[u8; 4]>::try_from(p).ok()).is_some_and(f) {
+                    k += 1;
+                }
+            }
+        }
+        k
+    };
+    // The ellipse's yellow contour and the flat rectangle's green one.
+    assert!(n(260, 480, &|p| p[0] > 200 && (150..230).contains(&p[1]) && p[2] < 80) > 200);
+    assert!(n(740, 960, &|p| p[0] < 80 && p[1] > 120 && p[2] < 120) > 300);
+}
+
 #[test]
 fn extrusions_show_their_sides_under_a_turned_camera() {
     let p = extruded_deck();
diff --git a/docs/gaps.md b/docs/gaps.md
index f0ded9aa..f7aef79c 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -171,10 +171,10 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
   1–3 % of the path length), "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting
   render as approximations and `scene3d`/`sp3d` round-trip as raw XML; extrusions draw their
   sides under turned cameras, each lit for its own normal; the preset light rigs, rig directions and
-  materials shade bevels and sides approximately (fitted to PowerPoint for three-point/matte only); no contours,
-  and no command or pane to apply 3-D).
-- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 2–4 h (3-D contours and
-  rig/material fidelity), plus the Format Shape page.
+  materials shade bevels and sides approximately (fitted to PowerPoint for three-point/matte only); contours draw as a
+  band round the face outline (not round the extruded silhouette); no command or pane to apply 3-D).
+- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 1–2 h (fitting the other rigs and materials
+  to PowerPoint renders), plus the Format Shape page.
 
 ### Proofing: spelling, thesaurus, AutoCorrect
 - **Evidence:** `review.spelling` checks a small built-in list of frequent misspellings
@@ -258,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | 3-D contours |
 | 2026-10-14 | trivial | 3-D light rigs and materials; extrusion sides lit per side |
 | 2026-10-14 | trivial | 3-D extrusions draw their sides under turned cameras |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |

From b03b19bca73f6e0d0d14c2e5db8683c4219547fd Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:29:49 +0300
Subject: [PATCH 219/376] SmartArt: write the outline to .pptx as a diagram;
 read it back from the data model

Export: a group with a diagram becomes a graphicFrame naming ppt/diagrams
data, layout, quickStyle and colors parts, plus the group's shapes as the
cached drawing (dsp). The data model is built from the outline (doc, node,
parTrans/sibTrans points and parOf links). A diagram read from a file keeps
its own layout, quick style and colour parts until its layout is switched.

Import: the outline is rebuilt from the data model's parOf tree, so
PowerPoint diagrams get the Text Pane. Their shapes stay the file's drawing
until the first outline edit (typed text isn't mapped back to nodes then).

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 Cargo.lock                        |   1 +
 crates/engine/Cargo.toml          |   3 +
 crates/engine/src/cmd/smartart.rs |  17 +-
 crates/engine/src/tests.rs        |  38 +++
 crates/model/src/lib.rs           |  15 +
 crates/pptx/src/dgm.rs            | 451 ++++++++++++++++++++++++++++++
 crates/pptx/src/lib.rs            |   1 +
 crates/pptx/src/read/shapes.rs    |  40 +++
 crates/pptx/src/write/mod.rs      |   7 +
 crates/pptx/src/write/shapes.rs   |  99 ++++++-
 docs/file-format-parity.md        |   2 +-
 docs/gaps.md                      |  18 +-
 12 files changed, 675 insertions(+), 17 deletions(-)
 create mode 100644 crates/pptx/src/dgm.rs

diff --git a/Cargo.lock b/Cargo.lock
index 4044fce6..d089e421 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -955,6 +955,7 @@ dependencies = [
  "serde",
  "serde_json",
  "thiserror 2.0.21",
+ "zip",
 ]
 
 [[package]]
diff --git a/crates/engine/Cargo.toml b/crates/engine/Cargo.toml
index 1f4dbfcd..38794151 100644
--- a/crates/engine/Cargo.toml
+++ b/crates/engine/Cargo.toml
@@ -25,3 +25,6 @@ i_overlay = { workspace = true }
 thiserror = { workspace = true }
 log = { workspace = true }
 image = { workspace = true }
+
+[dev-dependencies]
+zip = { workspace = true }
diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index 0993e87d..cfca7620 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -194,6 +194,9 @@ fn node_map(d: &Diagram) -> Vec<Vec<usize>> {
 
 /// Read text typed into the diagram's shapes back into its nodes.
 fn sync_text(d: &mut Diagram, children: &[Shape]) {
+    if d.imported {
+        return;
+    }
     for (shape, idx) in children.iter().zip(node_map(d)) {
         let Some(body) = &shape.text else { continue };
         if body.paragraphs.len() != idx.len() {
@@ -436,6 +439,7 @@ fn edit_diagram<T>(s: &mut Session, p: &Value, cmd: &str, f: impl FnOnce(&mut Di
         sync_text(&mut d, &children);
         let out = f(&mut d)?;
         normalize(&mut d.nodes);
+        d.imported = false;
         let kids = regenerate(doc, &d, child);
         let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad(cmd, "no slide"))?;
         let sh = deckcraft_model::find_shape_mut(shapes, gid).ok_or_else(|| bad(cmd, "no such shape"))?;
@@ -458,7 +462,7 @@ pub fn insert(s: &mut Session, kind: &str, mut nodes: Vec<DiagramNode>) -> Resul
         nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0 }).collect();
     }
     normalize(&mut nodes);
-    let d = Diagram { kind: kind.into(), nodes };
+    let d = Diagram { kind: kind.into(), nodes, ..Default::default() };
     let size = s.doc()?.doc.slide_size;
     let area = Xfrm::new(size.width * 0.1, size.height * 0.28, size.width * 0.8, size.height * 0.6);
     let id = s.edit(|doc, sel| {
@@ -542,6 +546,11 @@ fn change_layout(s: &mut Session, p: &Value) -> Result<Value> {
     const CMD: &str = "smartArt.layout";
     let kind = str_param(p, "kind").filter(|k| KINDS.contains(k)).ok_or_else(|| bad(CMD, "unknown layout"))?.to_string();
     edit_diagram(s, p, CMD, |d| {
+        if d.kind != kind {
+            // PowerPoint's own layout no longer applies.
+            d.layout_id.clear();
+            d.layout_xml = None;
+        }
         d.kind = kind;
         Ok(Value::Null)
     })
@@ -586,18 +595,18 @@ mod tests {
     #[test]
     fn layouts_map_nodes_to_shapes() {
         let area = Xfrm::new(0.0, 0.0, 800.0, 400.0);
-        let d = Diagram { kind: "list".into(), nodes: mk(&[0, 1, 1, 0]) };
+        let d = Diagram { kind: "list".into(), nodes: mk(&[0, 1, 1, 0]), ..Default::default() };
         let v = layout(&d, area);
         assert_eq!(v.len(), 2);
         let t = v[0].text.as_ref().map(|b| b.paragraphs.len());
         assert_eq!(t, Some(3), "sub-points are bullets in their parent's shape");
-        let h = Diagram { kind: "hierarchy".into(), nodes: mk(&[0, 1, 2, 1]) };
+        let h = Diagram { kind: "hierarchy".into(), nodes: mk(&[0, 1, 2, 1]), ..Default::default() };
         let v = layout(&h, area);
         assert_eq!(v.len(), 4 + 3, "a box per node and a line per parent link");
         for sh in &v {
             let x = sh.xfrm.unwrap_or_default();
             assert!(x.x >= -0.01 && x.x + x.w <= 800.01 && x.y >= -0.01 && x.y + x.h <= 400.01, "{x:?}");
         }
-        assert!(layout(&Diagram { kind: "cycle".into(), nodes: vec![] }, area).is_empty());
+        assert!(layout(&Diagram { kind: "cycle".into(), ..Default::default() }, area).is_empty());
     }
 }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 9d725f88..179b6a4f 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -884,3 +884,41 @@ fn smartart_text_pane_edits_regenerate_the_diagram() {
     let back = deckcraft_format::load(&bytes).unwrap();
     assert!(back.slides[0].shapes.iter().any(|x| x.diagram.as_ref().is_some_and(|d| d.nodes.len() == 3)));
 }
+
+#[test]
+fn smartart_round_trips_through_pptx_as_a_diagram() {
+    let mut s = session();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.smartArt", &json!({"kind": "hierarchy", "items": ["CEO", "\tCTO", "\t\tDev", "\tCFO"]})).unwrap();
+    let doc = s.doc().unwrap().doc.as_ref().clone();
+    let bytes = deckcraft_pptx::export(&doc).unwrap();
+    let names: Vec<String> = {
+        let z = zip::ZipArchive::new(std::io::Cursor::new(&bytes)).unwrap();
+        z.file_names().map(String::from).collect()
+    };
+    for part in ["data1", "layout1", "quickStyle1", "colors1", "drawing1"] {
+        assert!(names.iter().any(|n| n == &format!("ppt/diagrams/{part}.xml")), "{part} in {names:?}");
+    }
+    let back = deckcraft_pptx::import(&bytes).unwrap();
+    assert!(back.validate().is_empty());
+    let g = back.slides[1].shapes.iter().find(|x| x.diagram.is_some()).expect("a SmartArt group");
+    let d = g.diagram.as_ref().unwrap();
+    assert_eq!(d.kind, "hierarchy");
+    assert!(d.imported);
+    let outline: Vec<(&str, u8)> = d.nodes.iter().map(|n| (n.text.as_str(), n.level)).collect();
+    assert_eq!(outline, [("CEO", 0), ("CTO", 1), ("Dev", 2), ("CFO", 1)]);
+    assert!(g.children().len() >= 4, "the cached drawing is read back as shapes");
+
+    // The Text Pane works on the imported diagram, and a second round trip keeps the edit.
+    let gid = g.id.0;
+    let path = std::env::temp_dir().join(format!("deckcraft-smartart-{}.pptx", std::process::id()));
+    std::fs::write(&path, &bytes).unwrap();
+    let mut s2 = Session::new();
+    s2.execute("file.open", &json!({"path": path.to_string_lossy()})).unwrap();
+    let _ = std::fs::remove_file(&path);
+    s2.execute("slide.go", &json!({"index": 1})).unwrap();
+    s2.execute("smartArt.addNode", &json!({"id": gid, "index": 3, "position": "after", "text": "COO"})).unwrap();
+    let again = deckcraft_pptx::import(&deckcraft_pptx::export(s2.doc().unwrap().doc.as_ref()).unwrap()).unwrap();
+    let d = again.slides[1].shapes.iter().find_map(|x| x.diagram.clone()).unwrap();
+    assert_eq!(d.nodes.last().map(|n| (n.text.as_str(), n.level)), Some(("COO", 1)));
+}
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index bdd52a63..377f94ef 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -332,6 +332,21 @@ pub struct Diagram {
     /// list, process, cycle, hierarchy, pyramid or matrix.
     pub kind: String,
     pub nodes: Vec<DiagramNode>,
+    /// The group's shapes are the file's drawing, not generated from `nodes`: text typed into them
+    /// isn't mapped back to nodes (the first outline edit regenerates them).
+    #[serde(skip_serializing_if = "std::ops::Not::not")]
+    pub imported: bool,
+    /// PowerPoint's layout id (`layoutDef@uniqueId`) the diagram came with.
+    #[serde(skip_serializing_if = "String::is_empty")]
+    pub layout_id: String,
+    /// The file's own layout, quick style and colour definitions, written back unchanged while the
+    /// layout isn't switched.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub layout_xml: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub style_xml: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub colors_xml: Option<String>,
 }
 
 /// One line of the Text Pane: its text and outline level (0 = top level).
diff --git a/crates/pptx/src/dgm.rs b/crates/pptx/src/dgm.rs
new file mode 100644
index 00000000..a3af2702
--- /dev/null
+++ b/crates/pptx/src/dgm.rs
@@ -0,0 +1,451 @@
+//! SmartArt (DrawingML diagrams): the outline ⇄ the data model, and the layout, quick style and
+//! colour definitions DeckCraft writes for its own layouts.
+//!
+//! A diagram's data part holds its points (`dgm:pt`: the document, one per node, and the
+//! transitions PowerPoint pairs with each link) and its links (`dgm:cxn` of type `parOf`, parent →
+//! child, ordered by `srcOrd`). The outline is that tree flattened depth first.
+
+use std::collections::HashMap;
+
+use deckcraft_model::{Diagram, DiagramNode};
+
+use crate::xml::{A, El, W};
+
+pub const NS_DGM: &str = "http://schemas.openxmlformats.org/drawingml/2006/diagram";
+pub const NS_DSP: &str = "http://schemas.microsoft.com/office/drawing/2008/diagram";
+pub const CT_DATA: &str = "application/vnd.openxmlformats-officedocument.drawingml.diagramData+xml";
+pub const CT_LAYOUT: &str = "application/vnd.openxmlformats-officedocument.drawingml.diagramLayout+xml";
+pub const CT_STYLE: &str = "application/vnd.openxmlformats-officedocument.drawingml.diagramStyle+xml";
+pub const CT_COLORS: &str = "application/vnd.openxmlformats-officedocument.drawingml.diagramColors+xml";
+pub const CT_DRAWING: &str = "application/vnd.ms-office.drawingml.diagramDrawing+xml";
+pub const RT_DRAWING: &str = "http://schemas.microsoft.com/office/2007/relationships/diagramDrawing";
+const QS_ID: &str = "urn:microsoft.com/office/officeart/2005/8/quickstyle/simple1";
+const CS_ID: &str = "urn:microsoft.com/office/officeart/2005/8/colors/accent1_2";
+/// Most nodes read from one diagram.
+const MAX_NODES: usize = 2000;
+
+/// PowerPoint's built-in layout DeckCraft's layout `kind` is written as.
+pub fn layout_id(kind: &str) -> &'static str {
+    match kind {
+        "process" => "urn:microsoft.com/office/officeart/2005/8/layout/process1",
+        "cycle" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle2",
+        "hierarchy" => "urn:microsoft.com/office/officeart/2005/8/layout/hierarchy1",
+        "pyramid" => "urn:microsoft.com/office/officeart/2005/8/layout/pyramid1",
+        "matrix" => "urn:microsoft.com/office/officeart/2005/8/layout/matrix3",
+        _ => "urn:microsoft.com/office/officeart/2005/8/layout/vList2",
+    }
+}
+
+/// The DeckCraft layout closest to a PowerPoint layout (by its id and category).
+pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
+    let s = format!("{layout_id} {category}").to_ascii_lowercase();
+    if s.contains("hierarchy") || s.contains("orgchart") {
+        "hierarchy"
+    } else if s.contains("cycle") || s.contains("radial") {
+        "cycle"
+    } else if s.contains("pyramid") {
+        "pyramid"
+    } else if s.contains("matrix") {
+        "matrix"
+    } else if s.contains("process") || s.contains("chevron") || s.contains("arrow") {
+        "process"
+    } else {
+        "list"
+    }
+}
+
+fn category(kind: &str) -> &'static str {
+    match kind {
+        "process" => "process",
+        "cycle" => "cycle",
+        "hierarchy" => "hierarchy",
+        "pyramid" => "pyramid",
+        "matrix" => "matrix",
+        _ => "list",
+    }
+}
+
+/// A model id, stable for a given diagram (`seed`) and point number.
+fn guid(seed: u32, n: usize) -> String {
+    format!("{{{seed:08X}-D1A6-4C0A-9E5B-{n:012X}}}")
+}
+
+fn text(w: &mut W, t: &str) {
+    w.open0("dgm:t");
+    w.empty0("a:bodyPr");
+    w.empty0("a:lstStyle");
+    w.open0("a:p");
+    if t.is_empty() {
+        w.empty("a:endParaRPr", A::new().a("lang", "en-US"));
+    } else {
+        w.open0("a:r");
+        w.empty("a:rPr", A::new().a("lang", "en-US"));
+        w.elt("a:t", t);
+        w.close("a:r");
+    }
+    w.close("a:p");
+    w.close("dgm:t");
+}
+
+/// `ppt/diagrams/dataN.xml` for the outline. `drawing_rel` is the slide's relationship id of the
+/// cached drawing.
+pub fn data_xml(d: &Diagram, seed: u32, drawing_rel: &str) -> Vec<u8> {
+    let lo = if d.layout_id.is_empty() { layout_id(&d.kind).to_string() } else { d.layout_id.clone() };
+    let mut w = W::new();
+    w.open("dgm:dataModel", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("xmlns:r", crate::opc::NS_R));
+    w.open0("dgm:ptLst");
+    let doc = guid(seed, 0);
+    w.open("dgm:pt", A::new().a("modelId", &doc).a("type", "doc"));
+    w.empty(
+        "dgm:prSet",
+        A::new()
+            .a("loTypeId", &lo)
+            .a("loCatId", category(&d.kind))
+            .a("qsTypeId", QS_ID)
+            .a("qsCatId", "simple")
+            .a("csTypeId", CS_ID)
+            .a("csCatId", "accent1")
+            .a("phldr", "1"),
+    );
+    w.empty0("dgm:spPr");
+    text(&mut w, "");
+    w.close("dgm:pt");
+    // Node k: model id 1 + 3k; its link's parent and sibling transitions 2 + 3k and 3 + 3k.
+    let node = |k: usize| guid(seed, 1 + 3 * k);
+    for (k, n) in d.nodes.iter().enumerate() {
+        w.open("dgm:pt", A::new().a("modelId", node(k)));
+        w.empty("dgm:prSet", A::new().a("phldrT", "[Text]"));
+        w.empty0("dgm:spPr");
+        text(&mut w, &n.text);
+        w.close("dgm:pt");
+        let cxn = guid(seed, 0x10_0000 + k);
+        for (i, ty) in [(2, "parTrans"), (3, "sibTrans")] {
+            w.open("dgm:pt", A::new().a("modelId", guid(seed, i + 3 * k)).a("type", ty).a("cxnId", &cxn));
+            w.empty0("dgm:prSet");
+            w.empty0("dgm:spPr");
+            text(&mut w, "");
+            w.close("dgm:pt");
+        }
+    }
+    w.close("dgm:ptLst");
+    w.open0("dgm:cxnLst");
+    let mut stack: Vec<(u8, String)> = vec![];
+    let mut ords: HashMap<String, usize> = HashMap::new();
+    for (k, n) in d.nodes.iter().enumerate() {
+        while stack.last().is_some_and(|(l, _)| *l >= n.level) {
+            stack.pop();
+        }
+        let parent = stack.last().map(|(_, id)| id.clone()).unwrap_or_else(|| doc.clone());
+        let ord = ords.entry(parent.clone()).or_insert(0);
+        w.empty(
+            "dgm:cxn",
+            A::new()
+                .a("modelId", guid(seed, 0x10_0000 + k))
+                .a("srcId", &parent)
+                .a("destId", node(k))
+                .a("srcOrd", *ord)
+                .a("destOrd", 0)
+                .a("parTransId", guid(seed, 2 + 3 * k))
+                .a("sibTransId", guid(seed, 3 + 3 * k)),
+        );
+        *ord += 1;
+        stack.push((n.level, node(k)));
+    }
+    w.close("dgm:cxnLst");
+    w.empty0("dgm:bg");
+    w.empty0("dgm:whole");
+    w.open0("dgm:extLst");
+    w.open("a:ext", A::new().a("uri", "http://schemas.microsoft.com/office/drawing/2008/diagram"));
+    w.empty(
+        "dsp:dataModelExt",
+        A::new().a("xmlns:dsp", NS_DSP).a("relId", drawing_rel).a("minVer", "http://schemas.openxmlformats.org/drawingml/2006/diagram"),
+    );
+    w.close("a:ext");
+    w.close("dgm:extLst");
+    w.close("dgm:dataModel");
+    w.finish()
+}
+
+/// The outline of a data part: the `parOf` tree under the document point, depth first.
+pub fn outline(data: &El) -> Vec<DiagramNode> {
+    let Some(pts) = data.child("ptLst") else { return vec![] };
+    let mut texts: HashMap<&str, String> = HashMap::new();
+    let mut doc: Option<&str> = None;
+    for pt in pts.children_named("pt").take(MAX_NODES * 4) {
+        let Some(id) = pt.attr("modelId") else { continue };
+        match pt.attr("type").unwrap_or("node") {
+            "doc" => doc = doc.or(Some(id)),
+            "node" => {
+                let t = pt.child("t").map(paragraphs).unwrap_or_default();
+                texts.insert(id, t);
+            }
+            _ => {}
+        }
+    }
+    let Some(doc) = doc else { return vec![] };
+    let mut kids: HashMap<&str, Vec<(i64, &str)>> = HashMap::new();
+    if let Some(cx) = data.child("cxnLst") {
+        for c in cx.children_named("cxn").take(MAX_NODES * 4) {
+            if c.attr("type").unwrap_or("parOf") != "parOf" {
+                continue;
+            }
+            let (Some(src), Some(dst)) = (c.attr("srcId"), c.attr("destId")) else { continue };
+            if texts.contains_key(dst) {
+                kids.entry(src).or_default().push((c.i64("srcOrd").unwrap_or(0), dst));
+            }
+        }
+    }
+    for v in kids.values_mut() {
+        v.sort_by_key(|(o, _)| *o);
+    }
+    let mut out = vec![];
+    let mut seen = std::collections::HashSet::new();
+    // Depth first, iteratively; a node reached twice (a cycle in a hostile file) is skipped.
+    let mut stack: Vec<(&str, u8)> = kids.get(doc).map(|v| v.iter().rev().map(|(_, id)| (*id, 0u8)).collect()).unwrap_or_default();
+    while let Some((id, level)) = stack.pop() {
+        if out.len() >= MAX_NODES || !seen.insert(id) {
+            continue;
+        }
+        out.push(DiagramNode { text: texts.get(id).cloned().unwrap_or_default(), level: level.min(8) });
+        if let Some(v) = kids.get(id) {
+            stack.extend(v.iter().rev().map(|(_, c)| (*c, level.saturating_add(1))));
+        }
+    }
+    out
+}
+
+/// A text body's paragraphs joined by spaces.
+fn paragraphs(t: &El) -> String {
+    t.children_named("p")
+        .map(|p| {
+            let mut v = vec![];
+            p.find_all("t", &mut v);
+            v.iter().map(|e| e.text()).collect::<String>()
+        })
+        .filter(|s| !s.trim().is_empty())
+        .collect::<Vec<_>>()
+        .join(" ")
+}
+
+/// The layout algorithm and node shape of a DeckCraft layout.
+fn alg(kind: &str) -> (&'static str, Vec<(&'static str, &'static str)>, &'static str) {
+    match kind {
+        "process" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "roundRect"),
+        "cycle" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse"),
+        "pyramid" => ("pyra", vec![("linDir", "fromT"), ("txDir", "fromT"), ("pyraAcctPos", "bef")], "trapezoid"),
+        "matrix" => ("snake", vec![("grDir", "tL"), ("flowDir", "row"), ("contDir", "sameDir"), ("off", "ctr")], "roundRect"),
+        _ => ("lin", vec![("linDir", "fromT"), ("vertAlign", "mid")], "roundRect"),
+    }
+}
+
+fn node_layout(w: &mut W, shape: &str, bullets: bool) {
+    w.open("dgm:layoutNode", A::new().a("name", "node"));
+    w.open0("dgm:varLst");
+    w.empty("dgm:bulletEnabled", A::new().a("val", if bullets { "1" } else { "0" }));
+    w.close("dgm:varLst");
+    w.empty("dgm:alg", A::new().a("type", "tx"));
+    w.open("dgm:shape", A::new().a("type", shape).a("r:blip", ""));
+    w.empty0("dgm:adjLst");
+    w.close("dgm:shape");
+    w.empty("dgm:presOf", A::new().a("axis", if bullets { "desOrSelf" } else { "self" }).a("ptType", "node"));
+    w.open0("dgm:constrLst");
+    for side in ["tMarg", "bMarg", "lMarg", "rMarg"] {
+        w.empty("dgm:constr", A::new().a("type", side).a("refType", "primFontSz").a("fact", "0.3"));
+    }
+    w.close("dgm:constrLst");
+    w.open0("dgm:ruleLst");
+    w.empty("dgm:rule", A::new().a("type", "primFontSz").a("val", "5").a("fact", "NaN").a("max", "NaN"));
+    w.close("dgm:ruleLst");
+    w.close("dgm:layoutNode");
+}
+
+fn space(w: &mut W) {
+    w.open("dgm:forEach", A::new().a("name", "sibling").a("axis", "followSib").a("ptType", "sibTrans").a("cnt", "1"));
+    w.open("dgm:layoutNode", A::new().a("name", "space"));
+    w.empty("dgm:alg", A::new().a("type", "sp"));
+    w.open("dgm:shape", A::new().a("r:blip", ""));
+    w.empty0("dgm:adjLst");
+    w.close("dgm:shape");
+    w.empty0("dgm:presOf");
+    w.empty0("dgm:constrLst");
+    w.empty0("dgm:ruleLst");
+    w.close("dgm:layoutNode");
+    w.close("dgm:forEach");
+}
+
+/// `ppt/diagrams/layoutN.xml`: a layout definition for DeckCraft's layout `kind`, under the id of
+/// the closest built-in PowerPoint layout.
+pub fn layout_xml(kind: &str) -> Vec<u8> {
+    let mut w = W::new();
+    w.open(
+        "dgm:layoutDef",
+        A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("xmlns:r", crate::opc::NS_R).a("uniqueId", layout_id(kind)),
+    );
+    w.empty("dgm:title", A::new().a("val", ""));
+    w.empty("dgm:desc", A::new().a("val", ""));
+    w.open0("dgm:catLst");
+    w.empty("dgm:cat", A::new().a("type", category(kind)).a("pri", "1000"));
+    w.close("dgm:catLst");
+    w.open("dgm:layoutNode", A::new().a("name", "diagram"));
+    w.open0("dgm:varLst");
+    w.empty0("dgm:dir");
+    w.empty("dgm:resizeHandles", A::new().a("val", "exact"));
+    w.close("dgm:varLst");
+    if kind == "hierarchy" {
+        // Each node over the row of its children, recursively.
+        w.empty("dgm:alg", A::new().a("type", "hierChild"));
+        w.open("dgm:shape", A::new().a("r:blip", ""));
+        w.empty0("dgm:adjLst");
+        w.close("dgm:shape");
+        w.empty0("dgm:presOf");
+        w.empty0("dgm:constrLst");
+        w.empty0("dgm:ruleLst");
+        w.open("dgm:forEach", A::new().a("name", "level").a("axis", "ch").a("ptType", "node"));
+        w.open("dgm:layoutNode", A::new().a("name", "hierRoot"));
+        w.empty("dgm:alg", A::new().a("type", "hierRoot"));
+        w.open("dgm:shape", A::new().a("r:blip", ""));
+        w.empty0("dgm:adjLst");
+        w.close("dgm:shape");
+        w.empty0("dgm:presOf");
+        w.empty0("dgm:constrLst");
+        w.empty0("dgm:ruleLst");
+        node_layout(&mut w, "roundRect", false);
+        w.open("dgm:layoutNode", A::new().a("name", "hierChild"));
+        w.empty("dgm:alg", A::new().a("type", "hierChild"));
+        w.open("dgm:shape", A::new().a("r:blip", ""));
+        w.empty0("dgm:adjLst");
+        w.close("dgm:shape");
+        w.empty0("dgm:presOf");
+        w.empty0("dgm:constrLst");
+        w.empty0("dgm:ruleLst");
+        w.empty("dgm:forEach", A::new().a("name", "repeat").a("ref", "level"));
+        w.close("dgm:layoutNode");
+        w.close("dgm:layoutNode");
+        w.close("dgm:forEach");
+    } else {
+        let (ty, params, shape) = alg(kind);
+        w.open("dgm:alg", A::new().a("type", ty));
+        for (k, v) in params {
+            w.empty("dgm:param", A::new().a("type", k).a("val", v));
+        }
+        w.close("dgm:alg");
+        w.open("dgm:shape", A::new().a("r:blip", ""));
+        w.empty0("dgm:adjLst");
+        w.close("dgm:shape");
+        w.empty0("dgm:presOf");
+        w.open0("dgm:constrLst");
+        w.empty("dgm:constr", A::new().a("type", "w").a("for", "ch").a("forName", "node").a("refType", "w"));
+        w.empty(
+            "dgm:constr",
+            A::new().a("type", "h").a("for", "ch").a("forName", "node").a("refType", "w").a("refFor", "ch").a("refForName", "node").a("fact", "0.6"),
+        );
+        w.empty(
+            "dgm:constr",
+            A::new().a("type", "w").a("for", "ch").a("forName", "space").a("refType", "w").a("refFor", "ch").a("refForName", "node").a("fact", "0.1"),
+        );
+        w.empty("dgm:constr", A::new().a("type", "primFontSz").a("for", "ch").a("forName", "node").a("op", "equ").a("val", "65"));
+        w.close("dgm:constrLst");
+        w.empty0("dgm:ruleLst");
+        w.open("dgm:forEach", A::new().a("name", "nodes").a("axis", "ch").a("ptType", "node"));
+        node_layout(&mut w, shape, true);
+        if kind != "cycle" {
+            space(&mut w);
+        }
+        w.close("dgm:forEach");
+    }
+    w.close("dgm:layoutNode");
+    w.close("dgm:layoutDef");
+    w.finish()
+}
+
+/// `ppt/diagrams/quickStyleN.xml`: flat shapes drawn from the theme's first styles.
+pub fn style_xml() -> Vec<u8> {
+    let mut w = W::new();
+    w.open("dgm:styleDef", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("uniqueId", QS_ID));
+    w.empty("dgm:title", A::new().a("val", ""));
+    w.empty("dgm:desc", A::new().a("val", ""));
+    w.open0("dgm:catLst");
+    w.empty("dgm:cat", A::new().a("type", "simple").a("pri", "10100"));
+    w.close("dgm:catLst");
+    w.open0("dgm:scene3d");
+    w.empty("a:camera", A::new().a("prst", "orthographicFront"));
+    w.empty("a:lightRig", A::new().a("rig", "threePt").a("dir", "t"));
+    w.close("dgm:scene3d");
+    w.open("dgm:styleLbl", A::new().a("name", "node1"));
+    w.open0("dgm:scene3d");
+    w.empty("a:camera", A::new().a("prst", "orthographicFront"));
+    w.empty("a:lightRig", A::new().a("rig", "threePt").a("dir", "t"));
+    w.close("dgm:scene3d");
+    w.empty0("dgm:sp3d");
+    w.empty("dgm:txPr", A::new());
+    w.open0("dgm:style");
+    for (tag, idx) in [("a:lnRef", "2"), ("a:fillRef", "1"), ("a:effectRef", "0")] {
+        w.open(tag, A::new().a("idx", idx));
+        w.empty("a:scrgbClr", A::new().a("r", "0").a("g", "0").a("b", "0"));
+        w.close(tag);
+    }
+    w.open("a:fontRef", A::new().a("idx", "minor"));
+    w.empty("a:schemeClr", A::new().a("val", "lt1"));
+    w.close("a:fontRef");
+    w.close("dgm:style");
+    w.close("dgm:styleLbl");
+    w.close("dgm:styleDef");
+    w.finish()
+}
+
+/// `ppt/diagrams/colorsN.xml`: accent 1 fills with light text.
+pub fn colors_xml() -> Vec<u8> {
+    let mut w = W::new();
+    w.open("dgm:colorsDef", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("uniqueId", CS_ID));
+    w.empty("dgm:title", A::new().a("val", ""));
+    w.empty("dgm:desc", A::new().a("val", ""));
+    w.open0("dgm:catLst");
+    w.empty("dgm:cat", A::new().a("type", "accent1").a("pri", "11200"));
+    w.close("dgm:catLst");
+    w.open("dgm:styleLbl", A::new().a("name", "node1"));
+    for (tag, clr) in [("dgm:fillClrLst", "accent1"), ("dgm:linClrLst", "lt1")] {
+        w.open(tag, A::new().a("meth", "repeat"));
+        w.empty("a:schemeClr", A::new().a("val", clr));
+        w.close(tag);
+    }
+    w.empty0("dgm:effectClrLst");
+    w.empty0("dgm:txLinClrLst");
+    w.empty0("dgm:txFillClrLst");
+    w.empty0("dgm:txEffectClrLst");
+    w.close("dgm:styleLbl");
+    w.close("dgm:colorsDef");
+    w.finish()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn nodes(v: &[(&str, u8)]) -> Vec<DiagramNode> {
+        v.iter().map(|(t, l)| DiagramNode { text: (*t).into(), level: *l }).collect()
+    }
+
+    #[test]
+    fn outline_survives_the_data_model() {
+        let d =
+            Diagram { kind: "hierarchy".into(), nodes: nodes(&[("CEO", 0), ("CTO", 1), ("Dev", 2), ("CFO", 1), ("Board", 0)]), ..Default::default() };
+        let xml = data_xml(&d, 7, "rId9");
+        let doc = crate::xml::parse(&xml).unwrap();
+        assert_eq!(outline(&doc.root), d.nodes);
+        let s = String::from_utf8(xml).unwrap();
+        assert!(s.contains("hierarchy1") && s.contains("relId=\"rId9\""));
+        for x in [layout_xml("hierarchy"), layout_xml("cycle"), style_xml(), colors_xml()] {
+            assert!(crate::xml::parse(&x).is_ok());
+        }
+    }
+
+    #[test]
+    fn hostile_links_are_bounded() {
+        let xml = br#"<dgm:dataModel xmlns:dgm="d"><dgm:ptLst><dgm:pt modelId="0" type="doc"/><dgm:pt modelId="1"><dgm:t><a:p xmlns:a="a"><a:r><a:t>A</a:t></a:r></a:p></dgm:t></dgm:pt><dgm:pt modelId="2"/></dgm:ptLst><dgm:cxnLst><dgm:cxn srcId="0" destId="1"/><dgm:cxn srcId="1" destId="2"/><dgm:cxn srcId="2" destId="1"/><dgm:cxn type="presOf" srcId="0" destId="2"/></dgm:cxnLst></dgm:dataModel>"#;
+        let doc = crate::xml::parse(xml).unwrap();
+        assert_eq!(outline(&doc.root), nodes(&[("A", 0), ("", 1)]));
+        assert_eq!(kind_for("urn:microsoft.com/office/officeart/2005/8/layout/orgChart1", ""), "hierarchy");
+        assert_eq!(kind_for("urn:x/layout/chevron2", "process"), "process");
+        assert_eq!(kind_for("urn:x/layout/default", "list"), "list");
+    }
+}
diff --git a/crates/pptx/src/lib.rs b/crates/pptx/src/lib.rs
index 92274b62..a590aca8 100644
--- a/crates/pptx/src/lib.rs
+++ b/crates/pptx/src/lib.rs
@@ -8,6 +8,7 @@
 #![forbid(unsafe_code)]
 
 mod custgeom;
+mod dgm;
 mod maps;
 mod opc;
 mod png;
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index c4b3f77f..c33dcc03 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -432,9 +432,49 @@ fn smartart(imp: &mut Imp, part: &Part, gd: &El, frame: &Shape, depth: usize) ->
     let mut g = frame.clone();
     let x = frame.xfrm.unwrap_or_default();
     g.kind = ShapeKind::Group { children, child: Xfrm::new(0.0, 0.0, x.w, x.h) };
+    g.diagram = diagram_outline(imp, part, rel_ids, &data.root);
     Some(g)
 }
 
+/// The outline of a SmartArt graphic (for the Text Pane), with its layout, quick style and colour
+/// parts kept to be written back.
+fn diagram_outline(imp: &Imp, part: &Part, rel_ids: &El, data: &El) -> Option<deckcraft_model::Diagram> {
+    let nodes = crate::dgm::outline(data);
+    if nodes.is_empty() {
+        return None;
+    }
+    let raw = |attr: &str| -> Option<String> {
+        let rel = part.rels.get(rel_ids.attr(attr)?)?;
+        let bytes = imp.pkg.get(&rel.target)?;
+        (bytes.len() <= 4 << 20).then(|| String::from_utf8(bytes.to_vec()).ok()).flatten()
+    };
+    let layout_xml = raw("r:lo");
+    let (layout_id, cat) = layout_xml
+        .as_deref()
+        .and_then(|x| crate::xml::parse(x.as_bytes()).ok())
+        .map(|d| {
+            let cat = d.root.child("catLst").and_then(|c| c.child("cat")).and_then(|c| c.attr("type")).unwrap_or("").to_string();
+            (d.root.attr("uniqueId").unwrap_or("").to_string(), cat)
+        })
+        .unwrap_or_default();
+    let lo_type = data
+        .path(&["ptLst"])
+        .and_then(|l| l.children_named("pt").find(|p| p.attr("type") == Some("doc")))
+        .and_then(|p| p.child("prSet"))
+        .and_then(|p| p.attr("loTypeId"))
+        .unwrap_or("");
+    let id = if layout_id.is_empty() { lo_type.to_string() } else { layout_id };
+    Some(deckcraft_model::Diagram {
+        kind: crate::dgm::kind_for(&id, &cat).to_string(),
+        nodes,
+        imported: true,
+        layout_id: id,
+        layout_xml,
+        style_xml: raw("r:qs"),
+        colors_xml: raw("r:cs"),
+    })
+}
+
 fn table(imp: &mut Imp, part: &Part, tbl: &El) -> Table {
     // A table naming no style is drawn by PowerPoint with thin dark grid lines ("No Style, Table
     // Grid"), not without lines.
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..96e95dc5 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -43,6 +43,7 @@ pub struct Exp<'a> {
     n_image: u32,
     n_media: u32,
     n_chart: u32,
+    n_diagram: u32,
     pub slide_parts: HashMap<SlideId, String>,
     pub table_styles: Vec<String>,
     placeholder: Option<String>,
@@ -158,6 +159,11 @@ impl Exp<'_> {
         };
         o.rels.add("image", &opc::relative(&o.name, &part), false)
     }
+    /// The number of the next SmartArt graphic's parts.
+    pub fn next_diagram(&mut self) -> u32 {
+        self.n_diagram += 1;
+        self.n_diagram
+    }
     pub fn chart_rel(&mut self, o: &mut Out, c: &deckcraft_model::Chart) -> String {
         self.n_chart += 1;
         let name = format!("ppt/charts/chart{}.xml", self.n_chart);
@@ -385,6 +391,7 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         n_image: 0,
         n_media: 0,
         n_chart: 0,
+        n_diagram: 0,
         slide_parts: HashMap::new(),
         table_styles: vec![],
         placeholder: None,
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..bb3b63ac 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -202,7 +202,11 @@ fn locks(w: &mut W, tag: &str, s: &Shape, extra: A) {
 }
 
 fn style(w: &mut W, st: &ShapeStyle) {
-    w.open0("p:style");
+    style_tag(w, st, "p:style");
+}
+
+fn style_tag(w: &mut W, st: &ShapeStyle, tag: &str) {
+    w.open0(tag);
     for (tag, (idx, c)) in [("a:lnRef", &st.line_ref), ("a:fillRef", &st.fill_ref), ("a:effectRef", &st.effect_ref)] {
         w.open(tag, A::new().a("idx", idx));
         dml::color(w, c);
@@ -220,12 +224,16 @@ fn style(w: &mut W, st: &ShapeStyle) {
         }
         None => w.empty("a:fontRef", A::new().a("idx", idx)),
     }
-    w.close("p:style");
+    w.close(tag);
 }
 
 /// `p:spPr` contents (also used for pictures and connectors).
 fn sp_pr(w: &mut W, x: &mut Exp, o: &mut Out, s: &Shape, geom: bool) {
-    w.open0("p:spPr");
+    sp_pr_tag(w, x, o, s, geom, "p:spPr");
+}
+
+fn sp_pr_tag(w: &mut W, x: &mut Exp, o: &mut Out, s: &Shape, geom: bool, tag: &str) {
+    w.open0(tag);
     if let Some(xf) = &s.xfrm {
         dml::xfrm(w, "a:xfrm", xf, None);
     }
@@ -244,7 +252,7 @@ fn sp_pr(w: &mut W, x: &mut Exp, o: &mut Out, s: &Shape, geom: bool) {
             w.raw(raw);
         }
     }
-    w.close("p:spPr");
+    w.close(tag);
 }
 
 /// Write the children of a shape tree.
@@ -297,6 +305,11 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
             }
             w.close("p:pic");
         }
+        ShapeKind::Group { children, child } if s.diagram.is_some() && depth < 32 => {
+            if let Some(d) = &s.diagram {
+                diagram(w, x, o, cx, s, d, children, child);
+            }
+        }
         ShapeKind::Group { children, child } => {
             let id = cx.id_for(s);
             w.open0("p:grpSp");
@@ -400,6 +413,84 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
     }
 }
 
+/// A SmartArt graphic: a graphic frame naming its data, layout, quick style and colour parts,
+/// with the group's shapes as the cached drawing PowerPoint shows until it lays the diagram out.
+#[allow(clippy::too_many_arguments)]
+fn diagram(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, d: &deckcraft_model::Diagram, children: &[Shape], child: &Xfrm) {
+    use crate::dgm;
+    let id = cx.id_for(s);
+    let n = x.next_diagram();
+    let frame = s.xfrm.unwrap_or(*child);
+    let name = |kind: &str| format!("ppt/diagrams/{kind}{n}.xml");
+    // The drawing: the group's shapes in the frame's own coordinates.
+    let dname = name("drawing");
+    let mut dout = Out::new(&dname);
+    let mut dw = W::new();
+    dw.open(
+        "dsp:drawing",
+        A::new().a("xmlns:dgm", dgm::NS_DGM).a("xmlns:dsp", dgm::NS_DSP).a("xmlns:a", crate::opc::NS_A).a("xmlns:r", crate::opc::NS_R),
+    );
+    dw.open0("dsp:spTree");
+    dw.open0("dsp:nvGrpSpPr");
+    dw.empty("dsp:cNvPr", A::new().a("id", 0).a("name", ""));
+    dw.empty0("dsp:cNvGrpSpPr");
+    dw.close("dsp:nvGrpSpPr");
+    dw.empty0("dsp:grpSpPr");
+    let (sx, sy) = (frame.w / child.w.max(1e-6), frame.h / child.h.max(1e-6));
+    let mut k = 0;
+    let mut flat = vec![];
+    walk(children, &mut |c, _| {
+        if matches!(c.kind, ShapeKind::Shape) {
+            flat.push(c.clone());
+        }
+    });
+    for mut c in flat.into_iter().take(10_000) {
+        if let Some(xf) = &mut c.xfrm {
+            *xf = Xfrm { x: (xf.x - child.x) * sx, y: (xf.y - child.y) * sy, w: xf.w * sx, h: xf.h * sy, ..*xf };
+        }
+        k += 1;
+        dw.open("dsp:sp", A::new().a("modelId", format!("{{{:08X}-5D1A-4C0A-9E5B-{k:012X}}}", s.id.0)));
+        dw.open0("dsp:nvSpPr");
+        dw.empty("dsp:cNvPr", A::new().a("id", 0).a("name", ""));
+        dw.empty0("dsp:cNvSpPr");
+        dw.close("dsp:nvSpPr");
+        sp_pr_tag(&mut dw, x, &mut dout, &c, true, "dsp:spPr");
+        if let Some(st) = &c.style {
+            style_tag(&mut dw, st, "dsp:style");
+        }
+        if let Some(tb) = &c.text {
+            dml::text_body(&mut dw, x, &mut dout, "dsp:txBody", tb, false);
+        }
+        dw.close("dsp:sp");
+    }
+    dw.close("dsp:spTree");
+    dw.close("dsp:drawing");
+    x.pkg.xml_part(&dname, dgm::CT_DRAWING, dw.finish());
+    x.pkg.rels(&dname, &dout.rels);
+    let rel = |o: &mut Out, kind: &str, part: &str| o.rels.add_new(kind, &crate::opc::relative(&o.name, part), false);
+    let drawing_rel = rel(o, dgm::RT_DRAWING, &dname);
+    let data = name("data");
+    x.pkg.xml_part(&data, dgm::CT_DATA, dgm::data_xml(d, s.id.0, &drawing_rel));
+    let dm = rel(o, "diagramData", &data);
+    let layout = name("layout");
+    let lo_xml = d.layout_xml.clone().map(String::into_bytes).unwrap_or_else(|| dgm::layout_xml(&d.kind));
+    x.pkg.xml_part(&layout, dgm::CT_LAYOUT, lo_xml);
+    let lo = rel(o, "diagramLayout", &layout);
+    let style = name("quickStyle");
+    x.pkg.xml_part(&style, dgm::CT_STYLE, d.style_xml.clone().map(String::into_bytes).unwrap_or_else(dgm::style_xml));
+    let qs = rel(o, "diagramQuickStyle", &style);
+    let colors = name("colors");
+    x.pkg.xml_part(&colors, dgm::CT_COLORS, d.colors_xml.clone().map(String::into_bytes).unwrap_or_else(dgm::colors_xml));
+    let cs = rel(o, "diagramColors", &colors);
+    let mut fs = s.clone();
+    fs.xfrm = Some(frame);
+    frame_open(w, x, o, id, &fs);
+    w.open("a:graphicData", A::new().a("uri", "http://schemas.openxmlformats.org/drawingml/2006/diagram"));
+    w.empty("dgm:relIds", A::new().a("xmlns:dgm", dgm::NS_DGM).a("r:dm", dm).a("r:lo", lo).a("r:qs", qs).a("r:cs", cs));
+    w.close("a:graphicData");
+    frame_close(w);
+}
+
 fn ink_shape(st: &deckcraft_model::InkStroke, i: usize) -> Option<Shape> {
     let pts: Vec<(f64, f64)> = st.points.iter().filter(|p| p.0.is_finite() && p.1.is_finite()).map(|p| (p.0, p.1)).collect();
     let (x0, y0) = pts.iter().fold((f64::MAX, f64::MAX), |a, p| (a.0.min(p.0), a.1.min(p.1)));
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index d1427027..8f265645 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -74,7 +74,7 @@ the round trip even though DeckCraft doesn't model it.
 | Tables with styles | yes | yes | |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
 | Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
-| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save (DeckCraft keeps its own outline in `.deckcraft` only) |
+| SmartArt (`dgm`) | the drawing part as a group, and the outline from the data model (Text Pane) | as a diagram: data model from the outline; layout, quick style and colour parts (the file's own kept until the layout is switched); the group as the cached drawing | DeckCraft's layout definitions are simple; a diagram without a cached drawing isn't drawn |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
 | Ink (`contentPart`) | yes | as a group of freeform lines | PowerPoint sees shapes, not ink |
diff --git a/docs/gaps.md b/docs/gaps.md
index b737232c..3c7d5b31 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -151,14 +151,16 @@ Detail in [file-format-parity.md](file-format-parity.md).
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 
 ### SmartArt editing is shallow
-- **Evidence:** a SmartArt graphic inserted in DeckCraft keeps its outline (`Shape.diagram`) and
-  has a Text Pane, Add Shape (after, before, above, below), Promote, Demote, Remove and layout
-  switching between DeckCraft's six layouts (`crates/engine/src/cmd/smartart.rs`). But
-  `crates/pptx/src/read/shapes.rs` reads a PowerPoint diagram's drawing part as a plain group (no
-  outline, so no Text Pane), the outline isn't written to `.pptx` (`dgm` data), and there are six
-  layouts rather than PowerPoint's ~200.
-- **Impact:** editing a SmartArt diagram from PowerPoint breaks it.
-- **Estimate:** 8–14 h.
+- **Evidence:** a SmartArt graphic keeps its outline (`Shape.diagram`) and has a Text Pane, Add
+  Shape, Promote, Demote, Remove and layout switching (`crates/engine/src/cmd/smartart.rs`). On
+  `.pptx` the outline is written as a real diagram (data, layout, quick style, colours and the
+  cached drawing; `crates/pptx/src/dgm.rs`), and PowerPoint diagrams read their outline from the
+  data model, so they get the Text Pane too. Still missing: DeckCraft's own layout definitions are
+  simple (not yet checked in PowerPoint itself); there are six layouts rather than ~200; editing an
+  imported diagram's outline redraws it with DeckCraft's layout; a diagram with no cached drawing
+  isn't drawn.
+- **Impact:** a PowerPoint diagram edited in DeckCraft changes look.
+- **Estimate:** 6–10 h.
 
 ### Animation Pane, effect count and preview
 Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a **beta blocker**.

From 768641615afa017ba239f868543fb0cd1b401a59 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:29:51 +0300
Subject: [PATCH 220/376] Render: draw chart trendlines
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Fit linear, exponential, logarithmic, polynomial, power and moving-average
lines, including forecast, and draw them with the equation and R² label.
---
 ROADMAP.md                    |   4 +-
 crates/model/src/chart.rs     |  30 ++
 crates/model/src/lib.rs       |   1 +
 crates/model/src/trendline.rs | 614 ++++++++++++++++++++++++++++++++++
 crates/render/src/chart.rs    | 298 ++++++++++++++++-
 crates/render/src/tests.rs    | 106 +++++-
 docs/file-format-parity.md    |   5 +-
 docs/gaps.md                  |  10 +-
 docs/roadmap.md               |   3 +-
 9 files changed, 1056 insertions(+), 15 deletions(-)
 create mode 100644 crates/model/src/trendline.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index eb16cb98..e6a8f9df 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: chart trendlines round-trip; previous: minor, hours to ~95% per audience added; ready ~55%; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: chart trendlines are drawn; previous: trivial, chart trendlines round-trip; hours to ~95% per audience added; ready ~55%; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Chart trendlines are drawn: linear, exponential, logarithmic, polynomial, power and moving average, with forecast and the equation and R² label. The value axis grows to include the fit |
 | 2026-10-14 | Chart trendlines round-trip (type, polynomial order, moving-average period, forecast, intercept, equation and R²). An owned corpus slice also checks combo charts with data labels, merged tables with diagonal borders, and text columns, autofit, vertical text and a WordArt warp |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
@@ -151,6 +152,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: chart trendlines are drawn |
 | 2026-10-14 | trivial | Progress log: chart trendlines |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index 9e4e4a3e..2b166d6b 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -379,6 +379,17 @@ impl Chart {
             hi = hi.max(p);
             lo = lo.min(m);
         }
+        if !percent {
+            for s in &ser {
+                if self.series_kind(s).stacked() {
+                    continue;
+                }
+                for y in s.trendline_ys(crate::trendline::series_is_scatter(self.series_kind(s))) {
+                    hi = hi.max(y);
+                    lo = lo.min(y);
+                }
+            }
+        }
         if percent {
             hi = hi.max(1.0);
         }
@@ -436,6 +447,14 @@ impl Chart {
         if self.kind.percent() {
             return (0.0, 1.0);
         }
+        if !self.kind.stacked() {
+            for s in &self.series {
+                for y in s.trendline_ys(crate::trendline::series_is_scatter(self.series_kind(s))) {
+                    hi = hi.max(y);
+                    lo = lo.min(y);
+                }
+            }
+        }
         (self.y_min.unwrap_or(lo), self.y_max.unwrap_or(hi))
     }
 }
@@ -546,6 +565,17 @@ mod tests {
         }
     }
 
+    #[test]
+    fn a_forecast_grows_the_value_axis() {
+        let mut c = Chart::sample(ChartType::Line);
+        c.series.truncate(1);
+        c.series[0].values = vec![Some(3.0), Some(5.0), Some(7.0), Some(9.0)];
+        let before = c.value_range().1;
+        c.series[0].trendlines.push(Trendline { forward: Some(1.0), ..Default::default() });
+        let after = c.value_range().1;
+        assert!(after > before && after >= 11.0 - 1e-6, "{before} {after}");
+    }
+
     #[test]
     fn axis_labels_use_the_format_and_language() {
         let mut c = Chart::sample(ChartType::Column);
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..3e30b90d 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -17,6 +17,7 @@ pub mod style;
 pub mod table;
 pub mod text;
 pub mod theme;
+mod trendline;
 pub mod words;
 
 use std::sync::Arc;
diff --git a/crates/model/src/trendline.rs b/crates/model/src/trendline.rs
new file mode 100644
index 00000000..eeddd2bd
--- /dev/null
+++ b/crates/model/src/trendline.rs
@@ -0,0 +1,614 @@
+//! Least-squares trendlines: linear, exponential, logarithmic, polynomial, power, and a
+//! moving average. The fit is what the chart drawer plots and what the axis grows to include.
+
+use crate::chart::{ChartType, Series, Trendline, TrendlineType};
+
+/// A fitted trendline. `y` is `None` where the model is undefined (a log of a non-positive x,
+/// an exponential that overflowed).
+#[derive(Clone, Debug)]
+pub struct TrendFit {
+    kind: TrendlineType,
+    model: Model,
+    r2: f64,
+    x_min: f64,
+    x_max: f64,
+}
+
+#[derive(Clone, Debug)]
+enum Model {
+    /// `y = c[0] + c[1] x + c[2] x² + …`
+    Poly(Vec<f64>),
+    /// `y = c · e^(b x)`
+    Exp { c: f64, b: f64 },
+    /// `y = b + c · ln(x)`
+    Log { b: f64, c: f64 },
+    /// `y = c · x^b`
+    Power { c: f64, b: f64 },
+    /// Window averages in x order. No equation.
+    Moving(Vec<(f64, f64)>),
+}
+
+impl Trendline {
+    /// Fit `xs`/`ys` (paired). Non-finite pairs are dropped. `None` when the type needs more
+    /// points than it was given, or the normal equations have no solution.
+    pub fn fit(&self, xs: &[f64], ys: &[f64]) -> Option<TrendFit> {
+        let mut pairs: Vec<(f64, f64)> =
+            xs.iter().zip(ys).map(|(x, y)| (*x, *y)).filter(|(x, y)| x.is_finite() && y.is_finite()).take(10_000).collect();
+        if pairs.len() < 2 {
+            return None;
+        }
+        pairs.sort_by(|a, b| a.0.partial_cmp(&b.0).unwrap_or(std::cmp::Ordering::Equal));
+        let (x_min, x_max) = (pairs.first().map(|p| p.0)?, pairs.last().map(|p| p.0)?);
+        let intercept = self.intercept.filter(|v| v.is_finite());
+        let (model, used_y, yhat) = match self.kind {
+            TrendlineType::Linear => {
+                let (xs, ys) = split(&pairs);
+                let (b, m) = linreg(&xs, &ys, intercept)?;
+                let yhat: Vec<f64> = xs.iter().map(|x| b + m * x).collect();
+                (Model::Poly(vec![b, m]), ys, yhat)
+            }
+            TrendlineType::Poly => {
+                let order = self.order.unwrap_or(2).clamp(2, 6) as usize;
+                if pairs.len() < order + 1 {
+                    return None;
+                }
+                let (xs, ys) = split(&pairs);
+                let coeff = polyfit(&xs, &ys, order, intercept)?;
+                let yhat: Vec<f64> = xs.iter().map(|x| poly_y(&coeff, *x)).collect();
+                (Model::Poly(coeff), ys, yhat)
+            }
+            TrendlineType::Exp => {
+                let pairs: Vec<(f64, f64)> = pairs.into_iter().filter(|(_, y)| *y > 0.0).collect();
+                if pairs.len() < 2 {
+                    return None;
+                }
+                let (xs, ln_y): (Vec<f64>, Vec<f64>) = pairs.iter().map(|(x, y)| (*x, y.ln())).unzip();
+                let fixed = intercept.filter(|c| *c > 0.0).map(|c| c.ln());
+                let (ln_c, b) = linreg(&xs, &ln_y, fixed)?;
+                let c = ln_c.exp();
+                if !c.is_finite() || c <= 0.0 {
+                    return None;
+                }
+                let ys: Vec<f64> = pairs.iter().map(|(_, y)| *y).collect();
+                let yhat: Vec<f64> = xs.iter().map(|x| c * (b * x).exp()).collect();
+                (Model::Exp { c, b }, ys, yhat)
+            }
+            TrendlineType::Log => {
+                let pairs: Vec<(f64, f64)> = pairs.into_iter().filter(|(x, _)| *x > 0.0).collect();
+                if pairs.len() < 2 {
+                    return None;
+                }
+                let (ln_x, ys): (Vec<f64>, Vec<f64>) = pairs.iter().map(|(x, y)| (x.ln(), *y)).unzip();
+                let (b, c) = linreg(&ln_x, &ys, intercept)?;
+                let yhat: Vec<f64> = ln_x.iter().map(|u| b + c * u).collect();
+                (Model::Log { b, c }, ys, yhat)
+            }
+            TrendlineType::Power => {
+                let pairs: Vec<(f64, f64)> = pairs.into_iter().filter(|(x, y)| *x > 0.0 && *y > 0.0).collect();
+                if pairs.len() < 2 {
+                    return None;
+                }
+                let (ln_x, ln_y): (Vec<f64>, Vec<f64>) = pairs.iter().map(|(x, y)| (x.ln(), y.ln())).unzip();
+                let fixed = intercept.filter(|c| *c > 0.0).map(|c| c.ln());
+                let (ln_c, b) = linreg(&ln_x, &ln_y, fixed)?;
+                let c = ln_c.exp();
+                if !c.is_finite() || c <= 0.0 {
+                    return None;
+                }
+                let ys: Vec<f64> = pairs.iter().map(|(_, y)| *y).collect();
+                let yhat: Vec<f64> = pairs.iter().map(|(x, _)| c * x.powf(b)).collect();
+                (Model::Power { c, b }, ys, yhat)
+            }
+            TrendlineType::MovingAvg => {
+                let period = self.period.unwrap_or(2).clamp(2, 255) as usize;
+                if pairs.len() <= period {
+                    return None;
+                }
+                let mut pts = Vec::new();
+                let mut ys = Vec::new();
+                let mut yhat = Vec::new();
+                for i in period - 1..pairs.len() {
+                    let window = &pairs[i + 1 - period..=i];
+                    let avg = window.iter().map(|(_, y)| y).sum::<f64>() / period as f64;
+                    if avg.is_finite() {
+                        pts.push((pairs[i].0, avg));
+                        ys.push(pairs[i].1);
+                        yhat.push(avg);
+                    }
+                }
+                if pts.len() < 2 {
+                    return None;
+                }
+                (Model::Moving(pts), ys, yhat)
+            }
+        };
+        if yhat.iter().any(|v| !v.is_finite()) {
+            return None;
+        }
+        // A moving average starts at the first full window, not at the first data point.
+        let (x_min, x_max) = if let Model::Moving(pts) = &model {
+            match (pts.first(), pts.last()) {
+                (Some(a), Some(b)) => (a.0, b.0),
+                _ => (x_min, x_max),
+            }
+        } else {
+            (x_min, x_max)
+        };
+        Some(TrendFit { kind: self.kind, model, r2: r_squared(&used_y, &yhat), x_min, x_max })
+    }
+
+    /// The equation and R² lines this trendline asks to show. Empty when neither is on, and a
+    /// moving average has no equation.
+    pub fn caption(&self, fit: &TrendFit) -> String {
+        let mut lines = Vec::new();
+        if self.disp_eq
+            && let Some(eq) = fit.equation()
+        {
+            lines.push(eq);
+        }
+        if self.disp_r_sqr {
+            lines.push(fit.r2_label());
+        }
+        lines.join("\n")
+    }
+}
+
+impl TrendFit {
+    pub fn y(&self, x: f64) -> Option<f64> {
+        if !x.is_finite() {
+            return None;
+        }
+        let y = match &self.model {
+            Model::Poly(c) => poly_y(c, x),
+            Model::Exp { c, b } => c * (b * x).exp(),
+            Model::Log { b, c } => {
+                if x <= 0.0 {
+                    return None;
+                }
+                b + c * x.ln()
+            }
+            Model::Power { c, b } => {
+                if x <= 0.0 {
+                    return None;
+                }
+                c * x.powf(*b)
+            }
+            Model::Moving(_) => return None,
+        };
+        y.is_finite().then_some(y)
+    }
+
+    /// Samples from `x0` to `x1`, forecast included. A moving average returns its window points
+    /// and ignores the forecast (Excel does not extend one).
+    pub fn samples(&self, x0: f64, x1: f64) -> Vec<(f64, f64)> {
+        let (x0, x1) = if x0 <= x1 { (x0, x1) } else { (x1, x0) };
+        if !x0.is_finite() || !x1.is_finite() {
+            return Vec::new();
+        }
+        if let Model::Moving(pts) = &self.model {
+            return pts.iter().copied().filter(|(x, y)| x.is_finite() && y.is_finite()).take(10_000).collect();
+        }
+        if matches!(self.kind, TrendlineType::Linear) {
+            return [x0, x1].into_iter().filter_map(|x| self.y(x).map(|y| (x, y))).collect();
+        }
+        let steps = 48;
+        (0..=steps)
+            .filter_map(|i| {
+                let x = x0 + (x1 - x0) * i as f64 / steps as f64;
+                self.y(x).map(|y| (x, y))
+            })
+            .collect()
+    }
+
+    /// Data x plus forecast, in category (or scatter x) units. Forecast is capped so a hostile
+    /// value cannot walk off the chart.
+    pub fn span(&self, forward: Option<f64>, backward: Option<f64>) -> (f64, f64) {
+        let pad = |v: Option<f64>| v.filter(|v| v.is_finite() && *v > 0.0).map(|v| v.min(24.0)).unwrap_or(0.0);
+        if matches!(self.kind, TrendlineType::MovingAvg) { (self.x_min, self.x_max) } else { (self.x_min - pad(backward), self.x_max + pad(forward)) }
+    }
+
+    pub fn equation(&self) -> Option<String> {
+        let body = match &self.model {
+            Model::Poly(c) => poly_equation(c),
+            Model::Exp { c, b } => Some(format!("y = {}e^({}x)", num(*c), num(*b))),
+            Model::Log { b, c } => poly_equation(&[*b, *c]).map(|s| s.replacen("x", "ln(x)", 1)),
+            Model::Power { c, b } => {
+                let mag = if (c.abs() - 1.0).abs() < 1e-6 { String::new() } else { num(c.abs()) };
+                let sign = if *c < 0.0 { "-" } else { "" };
+                Some(format!("y = {sign}{mag}{}", x_pow(*b)))
+            }
+            Model::Moving(_) => None,
+        }?;
+        Some(body)
+    }
+
+    pub fn r2_label(&self) -> String {
+        let r = if self.r2.is_finite() { self.r2 } else { 0.0 };
+        if (r - 1.0).abs() < 5e-4 { "R² = 1".to_string() } else { format!("R² = {r:.3}") }
+    }
+}
+
+impl Series {
+    /// Trendline y values, including a short forecast, that sit near this series. The axis uses
+    /// them so a forecast is not clipped off the plot. A value many times the series' own range
+    /// is left out, so a wild polynomial cannot flatten the chart.
+    pub fn trendline_ys(&self, scatter: bool) -> Vec<f64> {
+        let n = self.values.len().min(10_000);
+        let mut xs = Vec::new();
+        let mut ys = Vec::new();
+        for i in 0..n {
+            let Some(y) = self.values.get(i).copied().flatten().filter(|v| v.is_finite()) else { continue };
+            let x = if scatter {
+                let Some(x) = self.x_values.get(i).copied().flatten().filter(|v| v.is_finite()) else { continue };
+                x
+            } else {
+                (i + 1) as f64
+            };
+            xs.push(x);
+            ys.push(y);
+        }
+        let (data_lo, data_hi) = ys.iter().fold((f64::MAX, f64::MIN), |(lo, hi), y| (lo.min(*y), hi.max(*y)));
+        if !data_lo.is_finite() || !data_hi.is_finite() {
+            return Vec::new();
+        }
+        let span = (data_hi - data_lo).abs().max(1.0);
+        let mid = (data_lo + data_hi) / 2.0;
+        let mut out = Vec::new();
+        for t in self.trendlines.iter().take(8) {
+            let Some(fit) = t.fit(&xs, &ys) else { continue };
+            let (x0, x1) = fit.span(t.forward, t.backward);
+            for (_, y) in fit.samples(x0, x1) {
+                if y.is_finite() && (y - mid).abs() <= span * 8.0 {
+                    out.push(y);
+                }
+            }
+        }
+        out
+    }
+}
+
+/// Whether a series is plotted against numeric x values rather than category positions.
+pub fn series_is_scatter(kind: ChartType) -> bool {
+    matches!(kind, ChartType::Scatter | ChartType::Bubble)
+}
+
+fn split(pairs: &[(f64, f64)]) -> (Vec<f64>, Vec<f64>) {
+    pairs.iter().map(|(x, y)| (*x, *y)).unzip()
+}
+
+/// `y = b + m x`. `intercept` fixes `b`.
+fn linreg(xs: &[f64], ys: &[f64], intercept: Option<f64>) -> Option<(f64, f64)> {
+    if xs.len() != ys.len() || xs.len() < 2 {
+        return None;
+    }
+    if let Some(b) = intercept {
+        let mut sxx = 0.0;
+        let mut sxy = 0.0;
+        for (x, y) in xs.iter().zip(ys) {
+            sxx += x * x;
+            sxy += x * (y - b);
+        }
+        if sxx.abs() < 1e-18 {
+            return None;
+        }
+        let m = sxy / sxx;
+        return (m.is_finite() && b.is_finite()).then_some((b, m));
+    }
+    let n = xs.len() as f64;
+    let (mut sx, mut sy, mut sxx, mut sxy) = (0.0, 0.0, 0.0, 0.0);
+    for (x, y) in xs.iter().zip(ys) {
+        sx += x;
+        sy += y;
+        sxx += x * x;
+        sxy += x * y;
+    }
+    let den = n * sxx - sx * sx;
+    if den.abs() < 1e-18 {
+        return None;
+    }
+    let m = (n * sxy - sx * sy) / den;
+    let b = (sy - m * sx) / n;
+    (m.is_finite() && b.is_finite()).then_some((b, m))
+}
+
+fn poly_y(coeff: &[f64], x: f64) -> f64 {
+    let mut acc = 0.0;
+    let mut xp = 1.0;
+    for c in coeff {
+        acc += c * xp;
+        if !acc.is_finite() {
+            return f64::NAN;
+        }
+        xp *= x;
+    }
+    acc
+}
+
+/// Polynomial through the normal equations. `x` is centred when the intercept is free, then
+/// expanded back to powers of `x`, so order 6 on category numbers stays solvable.
+#[allow(clippy::needless_range_loop)] // the index is the power in the normal equations
+fn polyfit(xs: &[f64], ys: &[f64], order: usize, intercept: Option<f64>) -> Option<Vec<f64>> {
+    let n = xs.len();
+    if n != ys.len() || !(1..=6).contains(&order) || n < order + 1 {
+        return None;
+    }
+    if let Some(b0) = intercept {
+        let m = order;
+        let mut ata = vec![vec![0.0; m]; m];
+        let mut atb = vec![0.0; m];
+        for (x, y) in xs.iter().zip(ys) {
+            let dy = y - b0;
+            for i in 0..m {
+                let xi = x.powi((i + 1) as i32);
+                atb[i] += dy * xi;
+                for j in i..m {
+                    ata[i][j] += xi * x.powi((j + 1) as i32);
+                }
+            }
+        }
+        for i in 0..m {
+            for j in 0..i {
+                ata[i][j] = ata[j][i];
+            }
+        }
+        let solved = solve(ata, atb)?;
+        let mut coeff = Vec::with_capacity(order + 1);
+        coeff.push(b0);
+        coeff.extend(solved);
+        return coeff.iter().all(|v| v.is_finite()).then_some(coeff);
+    }
+    let xm = xs.iter().sum::<f64>() / n as f64;
+    let us: Vec<f64> = xs.iter().map(|x| x - xm).collect();
+    let m = order + 1;
+    let mut ata = vec![vec![0.0; m]; m];
+    let mut atb = vec![0.0; m];
+    for (u, y) in us.iter().zip(ys) {
+        for i in 0..m {
+            let ui = if i == 0 { 1.0 } else { u.powi(i as i32) };
+            atb[i] += y * ui;
+            for j in i..m {
+                let uj = if j == 0 { 1.0 } else { u.powi(j as i32) };
+                ata[i][j] += ui * uj;
+            }
+        }
+    }
+    for i in 0..m {
+        for j in 0..i {
+            ata[i][j] = ata[j][i];
+        }
+    }
+    let centred = solve(ata, atb)?;
+    let coeff = expand_shift(&centred, xm);
+    coeff.iter().all(|v| v.is_finite()).then_some(coeff)
+}
+
+/// `a[k]` is the coefficient of `(x - xm)^k`. Return coefficients of powers of `x`.
+#[allow(clippy::needless_range_loop)] // j is the power of x after the binomial shift
+fn expand_shift(a: &[f64], xm: f64) -> Vec<f64> {
+    let mut c = vec![0.0; a.len()];
+    for (k, ak) in a.iter().enumerate() {
+        let mut binom = 1.0;
+        for j in 0..=k {
+            c[j] += ak * binom * (-xm).powi((k - j) as i32);
+            if j < k {
+                binom *= (k - j) as f64 / (j + 1) as f64;
+            }
+        }
+    }
+    c
+}
+
+#[allow(clippy::needless_range_loop)] // Gaussian elimination walks rows and columns by index
+fn solve(mut a: Vec<Vec<f64>>, mut b: Vec<f64>) -> Option<Vec<f64>> {
+    let n = b.len();
+    if n == 0 || n > 8 || a.len() != n {
+        return None;
+    }
+    for col in 0..n {
+        let mut piv = col;
+        for r in col + 1..n {
+            if a[r][col].abs() > a[piv][col].abs() {
+                piv = r;
+            }
+        }
+        if a[piv][col].abs() < 1e-12 {
+            return None;
+        }
+        a.swap(col, piv);
+        b.swap(col, piv);
+        let div = a[col][col];
+        for c in col..n {
+            a[col][c] /= div;
+        }
+        b[col] /= div;
+        for r in 0..n {
+            if r == col {
+                continue;
+            }
+            let f = a[r][col];
+            if f == 0.0 {
+                continue;
+            }
+            for c in col..n {
+                a[r][c] -= f * a[col][c];
+            }
+            b[r] -= f * b[col];
+        }
+    }
+    b.iter().all(|v| v.is_finite()).then_some(b)
+}
+
+fn r_squared(ys: &[f64], yhat: &[f64]) -> f64 {
+    if ys.is_empty() || ys.len() != yhat.len() {
+        return 0.0;
+    }
+    let mean = ys.iter().sum::<f64>() / ys.len() as f64;
+    let mut ss_tot = 0.0;
+    let mut ss_res = 0.0;
+    for (y, h) in ys.iter().zip(yhat) {
+        ss_tot += (y - mean) * (y - mean);
+        ss_res += (y - h) * (y - h);
+    }
+    if ss_tot < 1e-18 {
+        return if ss_res < 1e-12 { 1.0 } else { 0.0 };
+    }
+    let r = 1.0 - ss_res / ss_tot;
+    if r.is_finite() { r } else { 0.0 }
+}
+
+fn num(v: f64) -> String {
+    if !v.is_finite() {
+        return "0".to_string();
+    }
+    let a = v.abs();
+    if a == 0.0 {
+        return "0".to_string();
+    }
+    if a >= 1.0e6 || a < 1.0e-3 {
+        return format!("{v:.2e}").replace('+', "");
+    }
+    let digits = if a >= 100.0 {
+        1
+    } else if a >= 10.0 {
+        2
+    } else {
+        3
+    };
+    let mut s = format!("{v:.prec$}", prec = digits);
+    if let Some(dot) = s.find('.') {
+        while s.ends_with('0') {
+            s.pop();
+        }
+        if s.len() == dot + 1 {
+            s.pop();
+        }
+    }
+    s
+}
+
+fn x_pow(p: f64) -> String {
+    if (p - 1.0).abs() < 1e-6 {
+        "x".to_string()
+    } else if (p - 2.0).abs() < 1e-6 {
+        "x²".to_string()
+    } else if (p - 3.0).abs() < 1e-6 {
+        "x³".to_string()
+    } else {
+        format!("x^{}", num(p))
+    }
+}
+
+fn poly_equation(coeff: &[f64]) -> Option<String> {
+    let scale = coeff.iter().map(|c| c.abs()).fold(0.0, f64::max).max(1.0);
+    let mut body = String::new();
+    let mut first = true;
+    for (k, c) in coeff.iter().enumerate().rev() {
+        if c.abs() < scale * 1e-8 {
+            continue;
+        }
+        let pow = match k {
+            0 => String::new(),
+            1 => "x".to_string(),
+            _ => x_pow(k as f64),
+        };
+        let mag = if pow.is_empty() {
+            num(c.abs())
+        } else if (c.abs() - 1.0).abs() < scale * 1e-8 {
+            pow
+        } else {
+            format!("{}{}", num(c.abs()), pow)
+        };
+        if first {
+            if *c < 0.0 {
+                body.push('-');
+            }
+            body.push_str(&mag);
+            first = false;
+        } else if *c < 0.0 {
+            body.push_str(" - ");
+            body.push_str(&mag);
+        } else {
+            body.push_str(" + ");
+            body.push_str(&mag);
+        }
+    }
+    if body.is_empty() {
+        body.push('0');
+    }
+    Some(format!("y = {body}"))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn line(kind: TrendlineType) -> Trendline {
+        Trendline { kind, ..Default::default() }
+    }
+
+    #[test]
+    fn linear_recovers_slope_and_a_fixed_intercept() {
+        let xs = [1.0, 2.0, 3.0, 4.0];
+        let ys = [3.0, 5.0, 7.0, 9.0];
+        let fit = line(TrendlineType::Linear).fit(&xs, &ys).expect("fit");
+        assert!((fit.y(1.0).unwrap() - 3.0).abs() < 1e-9);
+        assert!((fit.y(4.0).unwrap() - 9.0).abs() < 1e-9);
+        assert_eq!(fit.equation().as_deref(), Some("y = 2x + 1"));
+        assert_eq!(fit.r2_label(), "R² = 1");
+        let mut forced = line(TrendlineType::Linear);
+        forced.intercept = Some(0.0);
+        let fit = forced.fit(&[1.0, 2.0], &[2.0, 4.0]).expect("fit");
+        assert!((fit.y(3.0).unwrap() - 6.0).abs() < 1e-6);
+        assert_eq!(fit.equation().as_deref(), Some("y = 2x"));
+    }
+
+    #[test]
+    fn exp_log_power_and_quadratic_round_their_points() {
+        let xs = [1.0, 2.0, 3.0, 4.0];
+        let exp = line(TrendlineType::Exp).fit(&xs, &[1.0, 2.0, 4.0, 8.0]).expect("exp");
+        for (x, y) in xs.iter().zip([1.0, 2.0, 4.0, 8.0]) {
+            assert!((exp.y(*x).unwrap() - y).abs() < 1e-6, "{x}");
+        }
+        assert!(exp.equation().unwrap().contains("e^("));
+        let log = line(TrendlineType::Log).fit(&xs, &[1.0_f64.ln(), 2.0_f64.ln(), 3.0_f64.ln(), 4.0_f64.ln()]).expect("log");
+        assert!((log.y(2.0).unwrap() - 2.0_f64.ln()).abs() < 1e-6);
+        assert!(log.equation().unwrap().contains("ln(x)"));
+        let power = line(TrendlineType::Power).fit(&xs, &[1.0, 4.0, 9.0, 16.0]).expect("power");
+        assert!((power.y(3.0).unwrap() - 9.0).abs() < 1e-6);
+        assert_eq!(power.equation().as_deref(), Some("y = x²"));
+        let mut poly = line(TrendlineType::Poly);
+        poly.order = Some(2);
+        let quad = poly.fit(&xs, &[1.0, 4.0, 9.0, 16.0]).expect("poly");
+        assert!((quad.y(3.0).unwrap() - 9.0).abs() < 1e-6);
+        assert_eq!(quad.equation().as_deref(), Some("y = x²"));
+    }
+
+    #[test]
+    fn moving_average_and_forecast_span() {
+        let fit = Trendline { kind: TrendlineType::MovingAvg, period: Some(2), ..Default::default() }
+            .fit(&[1.0, 2.0, 3.0, 4.0], &[2.0, 8.0, 4.0, 10.0])
+            .expect("ma");
+        let pts = fit.samples(0.0, 10.0);
+        assert_eq!(pts.len(), 3);
+        assert!((pts[0].1 - 5.0).abs() < 1e-9);
+        assert!((pts[1].1 - 6.0).abs() < 1e-9);
+        assert!((pts[2].1 - 7.0).abs() < 1e-9);
+        assert!(fit.equation().is_none());
+        let linear = line(TrendlineType::Linear).fit(&[1.0, 2.0], &[1.0, 2.0]).expect("line");
+        assert_eq!(linear.span(Some(1.5), Some(-3.0)), (1.0, 3.5));
+        assert_eq!(fit.span(Some(4.0), Some(4.0)), (2.0, 4.0));
+    }
+
+    #[test]
+    fn too_few_points_and_non_finite_input_fit_nothing() {
+        assert!(line(TrendlineType::Linear).fit(&[1.0], &[2.0]).is_none());
+        assert!(line(TrendlineType::Exp).fit(&[1.0, 2.0], &[-1.0, -2.0]).is_none());
+        assert!(line(TrendlineType::Poly).fit(&[1.0, 2.0], &[1.0, 2.0]).is_none());
+        assert!(line(TrendlineType::Linear).fit(&[f64::NAN, f64::INFINITY], &[1.0, 2.0]).is_none());
+        let mut t = line(TrendlineType::Linear);
+        t.disp_eq = true;
+        t.disp_r_sqr = true;
+        let fit = t.fit(&[1.0, 2.0, 3.0], &[1.0, 2.0, 3.0]).expect("fit");
+        assert_eq!(t.caption(&fit), "y = x\nR² = 1");
+    }
+}
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..0ead3648 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -2,7 +2,7 @@
 
 use deckcraft_color::{ColorTransform, Rgba, SchemeSlot};
 use deckcraft_model::Shape;
-use deckcraft_model::chart::{Chart, ChartType, axis_scale};
+use deckcraft_model::chart::{Chart, ChartType, TrendlineType, axis_scale};
 use deckcraft_model::resolve::Ctx;
 use deckcraft_model::style::{ColorRef, Fill};
 use deckcraft_model::text::{Align, Anchor, Bullet, TextBody};
@@ -344,11 +344,15 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         }
     }
     let ncat = c.categories.len().max(c.series.iter().map(|s| s.values.len()).max().unwrap_or(0)).max(1);
-    let band = if horiz { plot.height() / ncat as f64 } else { plot.width() / ncat as f64 };
+    // Forecast reserves empty category slots so the line can run past the data. Charts with no
+    // forecast keep the old band.
+    let (back, fwd) = forecast_pad(c);
+    let nspan = ncat as f64 + back + fwd;
+    let band = if horiz { plot.height() / nspan } else { plot.width() / nspan };
     // Category labels: wrapped onto two lines when they don't fit their band (long date ranges).
     let wraps = !horiz && c.categories.iter().any(|n| n.chars().count() as f64 * base * 0.5 > band);
     for (i, name) in c.categories.iter().enumerate() {
-        let mid = if horiz { plot.y0 + band * (i as f64 + 0.5) } else { plot.x0 + band * (i as f64 + 0.5) };
+        let mid = if horiz { plot.y0 + band * (i as f64 + back + 0.5) } else { plot.x0 + band * (i as f64 + back + 0.5) };
         if horiz {
             label(
                 ctx,
@@ -398,7 +402,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             for (bi, (si, s)) in bars.iter().enumerate() {
                 let sec = c.on_secondary(s);
                 let v = s.values.get(i).copied().flatten().unwrap_or(0.0) / total;
-                let start = band * i as f64 + (band - group) / 2.0 + if stacked { 0.0 } else { bar * bi as f64 };
+                let start = band * (i as f64 + back) + (band - group) / 2.0 + if stacked { 0.0 } else { bar * bi as f64 };
                 let (a, b) = if stacked {
                     if v >= 0.0 {
                         let r = (pos_acc, pos_acc + v);
@@ -471,9 +475,9 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                     let xs: Vec<f64> = s.x_values.iter().flatten().copied().collect();
                     let (xl, xh) = (xs.iter().copied().fold(f64::MAX, f64::min), xs.iter().copied().fold(f64::MIN, f64::max));
                     let xv = s.x_values.get(i).copied().flatten().unwrap_or(i as f64);
-                    if xh > xl { plot.x0 + (xv - xl) / (xh - xl) * plot.width() } else { plot.x0 + band * (i as f64 + 0.5) }
+                    if xh > xl { plot.x0 + (xv - xl) / (xh - xl) * plot.width() } else { plot.x0 + band * (i as f64 + back + 0.5) }
                 }
-                _ => plot.x0 + band * (i as f64 + 0.5),
+                _ => plot.x0 + band * (i as f64 + back + 0.5),
             };
             pts.push(Point::new(x, to_axis(sec, v)));
         }
@@ -511,6 +515,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             }
         }
     }
+    draw_trendlines(ctx, rctx, c, m, plot, band, back, ncat, horiz, base, text_col, &to_axis);
     // Axis line.
     let mut ax = BezPath::new();
     if horiz {
@@ -526,6 +531,255 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     ctx.stroke_path(&ax);
 }
 
+/// A corner of `plot` whose box stays clear of `pts` (the drawn trendline).
+fn caption_at(plot: Rect, box_w: f64, box_h: f64, pts: &[Point], n: usize) -> (f64, f64) {
+    let pad = 4.0;
+    let shift = n as f64 * (box_h + 2.0);
+    let x_right = (plot.x1 - box_w - pad).max(plot.x0 + pad);
+    let y_bottom = (plot.y1 - box_h - pad - shift).max(plot.y0 + pad);
+    let y_top = (plot.y0 + pad + shift).min(y_bottom);
+    let corners = [(plot.x0 + pad, y_top), (x_right, y_top), (plot.x0 + pad, y_bottom), (x_right, y_bottom)];
+    let mut best = corners[0];
+    let mut best_d = -1.0;
+    for (x, y) in corners {
+        let mut min_d = f64::MAX;
+        for p in pts {
+            let dx = if p.x < x {
+                x - p.x
+            } else if p.x > x + box_w {
+                p.x - (x + box_w)
+            } else {
+                0.0
+            };
+            let dy = if p.y < y {
+                y - p.y
+            } else if p.y > y + box_h {
+                p.y - (y + box_h)
+            } else {
+                0.0
+            };
+            min_d = min_d.min((dx * dx + dy * dy).sqrt());
+        }
+        if pts.is_empty() {
+            min_d = 1.0;
+        }
+        if min_d > best_d {
+            best_d = min_d;
+            best = (x, y);
+        }
+    }
+    best
+}
+
+fn pad_units(v: Option<f64>) -> f64 {
+    v.filter(|v| v.is_finite() && *v > 0.0).map(|v| v.min(3.0)).unwrap_or(0.0)
+}
+
+/// Empty category slots reserved for a trendline forecast, capped so the data still fills the plot.
+fn forecast_pad(c: &Chart) -> (f64, f64) {
+    if matches!(c.kind, ChartType::Scatter | ChartType::Bubble) {
+        return (0.0, 0.0);
+    }
+    let mut back = 0.0_f64;
+    let mut fwd = 0.0_f64;
+    for s in &c.series {
+        if matches!(c.series_kind(s), ChartType::Scatter | ChartType::Bubble) {
+            continue;
+        }
+        for t in s.trendlines.iter().take(8) {
+            if t.kind == TrendlineType::MovingAvg {
+                continue;
+            }
+            back = back.max(pad_units(t.backward));
+            fwd = fwd.max(pad_units(t.forward));
+        }
+    }
+    (back, fwd)
+}
+
+const TREND_INK: [Rgba; 4] = [Rgba::rgb(0x22, 0x22, 0x22), Rgba::rgb(0xB0, 0x30, 0x30), Rgba::rgb(0x1A, 0x5C, 0x7A), Rgba::rgb(0xA0, 0x68, 0x00)];
+
+fn map_xy(
+    plot: Rect,
+    band: f64,
+    back: f64,
+    horiz: bool,
+    scatter: bool,
+    sx0: f64,
+    sx1: f64,
+    sec: bool,
+    x: f64,
+    y: f64,
+    to_axis: &impl Fn(bool, f64) -> f64,
+) -> Option<Point> {
+    if !x.is_finite() || !y.is_finite() {
+        return None;
+    }
+    let value = to_axis(sec, y);
+    if !value.is_finite() {
+        return None;
+    }
+    let along = if scatter && sx1 > sx0 {
+        plot.x0 + (x - sx0) / (sx1 - sx0) * plot.width()
+    } else {
+        let origin = if horiz { plot.y0 } else { plot.x0 };
+        origin + band * (x - 1.0 + back + 0.5)
+    };
+    if !along.is_finite() {
+        return None;
+    }
+    Some(if horiz && !scatter { Point::new(value, along) } else { Point::new(along, value) })
+}
+
+/// The part of segment `a`–`b` that lies inside `r`.
+fn clip_seg(a: Point, b: Point, r: Rect) -> Option<(Point, Point)> {
+    let (mut t0, mut t1) = (0.0, 1.0);
+    let dx = b.x - a.x;
+    let dy = b.y - a.y;
+    let p = [-dx, dx, -dy, dy];
+    let q = [a.x - r.x0, r.x1 - a.x, a.y - r.y0, r.y1 - a.y];
+    for i in 0..4 {
+        let (pi, qi) = (p[i], q[i]);
+        if pi.abs() < 1e-12 {
+            if qi < 0.0 {
+                return None;
+            }
+        } else {
+            let t = qi / pi;
+            if pi < 0.0 {
+                if t > t1 {
+                    return None;
+                } else if t > t0 {
+                    t0 = t;
+                }
+            } else if t < t0 {
+                return None;
+            } else if t < t1 {
+                t1 = t;
+            }
+        }
+    }
+    Some((Point::new(a.x + t0 * dx, a.y + t0 * dy), Point::new(a.x + t1 * dx, a.y + t1 * dy)))
+}
+
+fn draw_trendlines(
+    ctx: &mut RenderContext,
+    rctx: &Ctx,
+    c: &Chart,
+    m: Affine,
+    plot: Rect,
+    band: f64,
+    back: f64,
+    ncat: usize,
+    horiz: bool,
+    base: f64,
+    text_col: Rgba,
+    to_axis: &impl Fn(bool, f64) -> f64,
+) {
+    let mut label_n = 0usize;
+    for s in &c.series {
+        if s.trendlines.is_empty() {
+            continue;
+        }
+        let kind = c.series_kind(s);
+        let scatter = matches!(kind, ChartType::Scatter | ChartType::Bubble);
+        let sec = c.on_secondary(s);
+        let mut xs = Vec::new();
+        let mut ys = Vec::new();
+        for i in 0..ncat {
+            let Some(y) = s.values.get(i).copied().flatten().filter(|v| v.is_finite()) else { continue };
+            let x = if scatter {
+                let Some(x) = s.x_values.get(i).copied().flatten().filter(|v| v.is_finite()) else { continue };
+                x
+            } else {
+                (i + 1) as f64
+            };
+            xs.push(x);
+            ys.push(y);
+        }
+        // The same x extent the scatter marks use, so the fit sits on the points.
+        let (sx0, sx1) = if scatter {
+            let mut lo = f64::MAX;
+            let mut hi = f64::MIN;
+            for v in s.x_values.iter().copied().flatten().filter(|v| v.is_finite()) {
+                lo = lo.min(v);
+                hi = hi.max(v);
+            }
+            (lo, hi)
+        } else {
+            (0.0, 0.0)
+        };
+        for (ti, t) in s.trendlines.iter().take(8).enumerate() {
+            let Some(fit) = t.fit(&xs, &ys) else { continue };
+            let (x0, x1) = fit.span(t.forward, t.backward);
+            let samples = fit.samples(x0, x1);
+            let mut path = BezPath::new();
+            let mut prev: Option<Point> = None;
+            let mut ink_pts = Vec::new();
+            let mut any = false;
+            for w in samples.windows(2) {
+                let (Some(a), Some(b)) = (
+                    map_xy(plot, band, back, horiz, scatter, sx0, sx1, sec, w[0].0, w[0].1, to_axis),
+                    map_xy(plot, band, back, horiz, scatter, sx0, sx1, sec, w[1].0, w[1].1, to_axis),
+                ) else {
+                    prev = None;
+                    continue;
+                };
+                let Some((ca, cb)) = clip_seg(a, b, plot) else {
+                    prev = None;
+                    continue;
+                };
+                let cont = prev.is_some_and(|p| (p.x - ca.x).abs() < 0.6 && (p.y - ca.y).abs() < 0.6);
+                if cont {
+                    path.line_to(cb);
+                } else {
+                    path.move_to(ca);
+                    path.line_to(cb);
+                }
+                prev = Some(cb);
+                if ink_pts.len() < 64 {
+                    ink_pts.push(ca);
+                    ink_pts.push(cb);
+                }
+                any = true;
+            }
+            if !any {
+                continue;
+            }
+            ctx.set_transform(m);
+            let ink = TREND_INK.get(ti % TREND_INK.len()).copied().unwrap_or(Rgba::rgb(0x22, 0x22, 0x22));
+            ctx.set_paint(color(ink, 1.0));
+            ctx.set_stroke(kurbo::Stroke::new(1.6).with_dashes(0.0, [6.0, 3.5]).with_caps(kurbo::Cap::Round));
+            ctx.stroke_path(&path);
+            let caption = t.caption(&fit);
+            if caption.is_empty() {
+                continue;
+            }
+            let lines = caption.chars().filter(|ch| *ch == '\n').count() + 1;
+            let box_h = base * 1.3 * lines as f64 + 2.0;
+            let widest = caption.lines().map(|l| l.chars().count()).max().unwrap_or(1) as f64;
+            let box_w = (widest * base * 0.62).clamp(48.0, plot.width() * 0.72);
+            let (x, y) = caption_at(plot, box_w, box_h, &ink_pts, label_n);
+            ctx.set_transform(m);
+            ctx.set_paint(color(Rgba::WHITE, 1.0));
+            ctx.fill_rect(&Rect::new(x, y, x + box_w, y + box_h));
+            label(
+                ctx,
+                rctx,
+                m,
+                &caption,
+                Rect::new(x, y, x + box_w, y + box_h),
+                (base * 0.9).clamp(8.0, 13.0),
+                Align::Left,
+                Anchor::Top,
+                text_col,
+                false,
+            );
+            label_n += 1;
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -561,4 +815,36 @@ mod tests {
         assert_eq!(plot, AREA);
         assert_eq!(o.x, 340.0);
     }
+
+    #[test]
+    fn clip_keeps_the_part_inside_the_plot() {
+        let r = Rect::new(0.0, 0.0, 100.0, 50.0);
+        let (a, b) = clip_seg(Point::new(-50.0, 25.0), Point::new(150.0, 25.0), r).expect("clipped");
+        assert!((a.x - 0.0).abs() < 1e-6 && (b.x - 100.0).abs() < 1e-6);
+        assert!((a.y - 25.0).abs() < 1e-6);
+        assert!(clip_seg(Point::new(-10.0, -10.0), Point::new(-1.0, -1.0), r).is_none());
+        let (a, b) = clip_seg(Point::new(10.0, 10.0), Point::new(40.0, 20.0), r).expect("inside");
+        assert!((a.x - 10.0).abs() < 1e-6 && (b.x - 40.0).abs() < 1e-6);
+    }
+
+    #[test]
+    fn caption_keeps_clear_of_a_line_into_the_top_right() {
+        let plot = Rect::new(0.0, 0.0, 200.0, 100.0);
+        let pts = [Point::new(20.0, 80.0), Point::new(180.0, 15.0)];
+        let (x, y) = caption_at(plot, 60.0, 20.0, &pts, 0);
+        assert!(x > 100.0 && y > 40.0, "label on the line at {x} {y}");
+    }
+
+    #[test]
+    fn forecast_reserves_at_most_three_category_slots() {
+        use deckcraft_model::chart::Trendline;
+        let mut c = Chart::sample(ChartType::Line);
+        c.series[0].trendlines.push(Trendline { forward: Some(10.0), backward: Some(0.5), ..Default::default() });
+        assert_eq!(forecast_pad(&c), (0.5, 3.0));
+        c.series[0].trendlines[0].kind = TrendlineType::MovingAvg;
+        assert_eq!(forecast_pad(&c), (0.0, 0.0));
+        c.kind = ChartType::Scatter;
+        c.series[0].trendlines[0].kind = TrendlineType::Linear;
+        assert_eq!(forecast_pad(&c), (0.0, 0.0));
+    }
 }
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..470e5505 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1,5 +1,5 @@
 use super::*;
-use deckcraft_model::chart::ChartType;
+use deckcraft_model::chart::{ChartType, Trendline, TrendlineType};
 use deckcraft_model::style::ColorRef;
 use deckcraft_model::text::TextBody;
 use deckcraft_model::{Chart, Geom, Presentation, Shape, ShapeId, ShapeKind, ShapeStyle, Table, Xfrm};
@@ -155,6 +155,110 @@ fn combo_chart_draws_columns_and_a_line_on_its_own_axis() {
     assert!(col[0] < 250 || col[1] < 250 || col[2] < 250, "no column: {col:?}");
 }
 
+fn trend_chart(title: &str, kind: ChartType, ys: &[f64], trend: Trendline, y_max: f64) -> Chart {
+    let mut c = Chart::sample(kind);
+    c.title = Some(title.into());
+    c.legend = None;
+    c.categories = vec!["A".into(), "B".into(), "C".into(), "D".into()];
+    c.series.truncate(1);
+    c.series[0].name = "Data".into();
+    c.series[0].values = ys.iter().copied().map(Some).collect();
+    c.y_min = Some(0.0);
+    c.y_max = Some(y_max);
+    c.series[0].trendlines = vec![trend];
+    c
+}
+
+fn trend_line(kind: TrendlineType) -> Trendline {
+    Trendline { kind, disp_eq: true, disp_r_sqr: true, ..Default::default() }
+}
+
+/// Six charts, one trendline type each. `draw` drops the trendlines. `forecast` extends the linear fit.
+fn trend_gallery(draw: bool, forecast: bool) -> Image {
+    let mut linear = trend_line(TrendlineType::Linear);
+    if forecast {
+        linear.forward = Some(1.0);
+        linear.backward = Some(0.5);
+    }
+    let mut poly = trend_line(TrendlineType::Poly);
+    poly.order = Some(2);
+    let mut ma = trend_line(TrendlineType::MovingAvg);
+    ma.period = Some(2);
+    let mut charts = vec![
+        trend_chart("Linear", ChartType::Column, &[3.0, 5.0, 7.0, 9.0], linear, 12.0),
+        trend_chart("Exponential", ChartType::LineMarkers, &[1.0, 2.0, 4.0, 8.0], trend_line(TrendlineType::Exp), 10.0),
+        trend_chart(
+            "Logarithmic",
+            ChartType::LineMarkers,
+            &[1.0_f64.ln(), 2.0_f64.ln(), 3.0_f64.ln(), 4.0_f64.ln()],
+            trend_line(TrendlineType::Log),
+            2.0,
+        ),
+        trend_chart("Polynomial", ChartType::LineMarkers, &[1.0, 4.0, 9.0, 16.0], poly, 18.0),
+        trend_chart("Power", ChartType::LineMarkers, &[2.0, 2.0 * 2.0_f64.sqrt(), 2.0 * 3.0_f64.sqrt(), 4.0], trend_line(TrendlineType::Power), 6.0),
+        trend_chart("Moving average", ChartType::LineMarkers, &[2.0, 8.0, 4.0, 10.0], ma, 12.0),
+    ];
+    if !draw {
+        for c in &mut charts {
+            c.series[0].trendlines.clear();
+        }
+    }
+    let shapes = charts
+        .into_iter()
+        .enumerate()
+        .map(|(i, c)| Shape {
+            id: ShapeId(800 + i as u32),
+            xfrm: Some(Xfrm::new(12.0 + (i % 3) as f64 * 316.0, 12.0 + (i / 3) as f64 * 264.0, 304.0, 252.0)),
+            kind: ShapeKind::Chart(Box::new(c)),
+            ..Default::default()
+        })
+        .collect();
+    render_slide(&deck_with(shapes), 0, &RenderOpts { scale: 1.0, ..Default::default() })
+}
+
+#[test]
+fn trendlines_draw_through_the_points_with_a_label() {
+    let on = trend_gallery(true, false);
+    let off = trend_gallery(false, false);
+    assert_eq!((on.width, on.height), (960, 540));
+    let dark = on
+        .pixels
+        .as_chunks::<4>()
+        .0
+        .iter()
+        .zip(off.pixels.as_chunks::<4>().0)
+        .filter(|(a, b)| a[0] < 50 && a[1] < 50 && a[2] < 50 && b[0] as i32 - a[0] as i32 > 20)
+        .count();
+    assert!(dark > 40, "dashed trendline ink {dark}");
+    // A scatter fit uses the real x values and still paints the dash.
+    let mut scatter = trend_chart("Scatter", ChartType::Scatter, &[2.0, 4.0, 6.0, 8.0], trend_line(TrendlineType::Linear), 10.0);
+    scatter.series[0].x_values = (1..=4).map(|x| Some(x as f64)).collect();
+    let sh = Shape {
+        id: ShapeId(810),
+        xfrm: Some(Xfrm::new(0.0, 0.0, 480.0, 360.0)),
+        kind: ShapeKind::Chart(Box::new(scatter.clone())),
+        ..Default::default()
+    };
+    let with = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    scatter.series[0].trendlines.clear();
+    let sh =
+        Shape { id: ShapeId(810), xfrm: Some(Xfrm::new(0.0, 0.0, 480.0, 360.0)), kind: ShapeKind::Chart(Box::new(scatter)), ..Default::default() };
+    let without = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    let scatter_dark = with
+        .pixels
+        .as_chunks::<4>()
+        .0
+        .iter()
+        .zip(without.pixels.as_chunks::<4>().0)
+        .filter(|(a, b)| a[0] < 50 && a[1] < 50 && a[2] < 50 && b[0] as i32 - a[0] as i32 > 20)
+        .count();
+    assert!(scatter_dark > 20, "scatter trendline ink {scatter_dark}");
+    if std::env::var_os("DECKCRAFT_TREND_SHOT").is_some() {
+        let png = trend_gallery(true, true).to_png();
+        std::fs::write("/tmp/deckcraft-trendlines.png", &png).expect("write trendline screenshot");
+    }
+}
+
 #[test]
 fn placeholder_prompts_only_in_edit_view() {
     let p = Presentation::default();
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index d8c0667e..43afc9e5 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines round-trip; previously trivial: groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines are drawn; previously minor: chart trendlines round-trip; groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -72,7 +72,7 @@ the round trip even though DeckCraft doesn't model it.
 | Text warp (`prstTxWarp`) | yes | yes | All 40 presets rendered (`crates/geom/src/warp.rs`); adjust values (`avLst`) round-trip |
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | Merges and both diagonal borders round-trip |
-| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. Trendlines (type, order or period, forecast, intercept, equation and R²) are read and written; they are not drawn. A combo chart's secondary value axis is read and is not written back when the chart is rebuilt |
+| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. Trendlines (type, order or period, forecast, intercept, equation and R²) are read, written and drawn. A combo chart's secondary value axis is read and is not written back when the chart is rebuilt |
 | Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Chart trendlines are drawn (linear, exponential, logarithmic, polynomial, power, moving average, forecast, equation and R²) |
 | 2026-10-14 | minor | Chart trendlines round-trip (`corpus_charts.rs`); merges, diagonal borders, columns, autofit, vertical text and WordArt warp are in that slice |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
diff --git a/docs/gaps.md b/docs/gaps.md
index 20327e5a..c3b955b2 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines round-trip; previous: minor, 3-D bevel, camera and face lighting rendered; IME composition and CJK interface text landed, #101; core-workflow alpha gate added; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines are drawn; previous: minor, chart trendlines round-trip; 3-D bevel, camera and face lighting rendered; IME composition and CJK interface text landed, #101; core-workflow alpha gate added; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -148,9 +148,10 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
-  whisker) aren't read. Trendlines round-trip (`corpus_charts.rs`) and are not drawn. A combo
-  chart's secondary value axis is read (`y2_*`, `Series.secondary_axis`) and is not written back
-  when the chart is rebuilt.
+  whisker) aren't read. Trendlines round-trip (`corpus_charts.rs`) and are drawn: linear,
+  exponential, logarithmic, polynomial, power and moving average, with forecast and the equation
+  and R² label. A combo chart's secondary value axis is read (`y2_*`, `Series.secondary_axis`) and
+  is not written back when the chart is rebuilt.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 
@@ -260,6 +261,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Chart trendlines are drawn (six types, forecast, equation and R²). The charts gap stays open for the data grid, chartex and secondary-axis export; the real-deck corpus gap stays open |
 | 2026-10-14 | minor | Chart trendlines round-trip. The real-deck corpus gap stays open; secondary-axis export and drawing trendlines stay in the charts gap |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 0321e67b..a291388d 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (chart trendlines round-trip; the real-deck corpus stays open; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (chart trendlines are drawn; the charts gap stays open for the data grid, chartex and secondary-axis export; previous: trivial, chart trendlines round-trip; the real-deck corpus stays open; core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -109,6 +109,7 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Chart trendlines are drawn. The charts gap stays open for the data grid, chartex and secondary-axis export; the real-deck corpus (item 2) stays open |
 | 2026-10-14 | trivial | Chart trendlines round-trip in an owned corpus slice; the real-deck corpus (item 2) stays open |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |

From c176d42bb468388b57244254e85479a5df8e07ff Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:31:40 +0300
Subject: [PATCH 221/376] Charts: polar radar, stock high-low lines and up/down
 bars, combo sample

Radar and filled radar charts are drawn polar: spokes per category,
polygon gridlines and value labels up the first spoke. Stock charts
draw high-low lines with close dashes, or up/down bars between open
and close, and are saved as c:stockChart (hiLowLines, upDownBars)
instead of a line chart; c:upDownBars is read, and chart.options takes
upDownBars. New stock charts start as high-low-close and new combo
charts as columns with a line.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/insert.rs |   6 +-
 crates/model/src/chart.rs       |  20 ++++
 crates/pptx/src/read/chart.rs   |   5 +-
 crates/pptx/src/write/chart.rs  |  56 +++++++++-
 crates/pptx/tests/roundtrip.rs  |  34 ++++++
 crates/render/src/chart.rs      |  18 ++-
 crates/render/src/lib.rs        |   1 +
 crates/render/src/radar.rs      | 187 ++++++++++++++++++++++++++++++++
 crates/render/src/tests.rs      |  49 +++++++++
 docs/gaps.md                    |   5 +-
 10 files changed, 371 insertions(+), 10 deletions(-)
 create mode 100644 crates/render/src/radar.rs

diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 8a0a7d28..5d6b334c 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -73,7 +73,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Chart Elements",
             ["Chart Design", "Chart Layouts"],
             None,
-            "{title?: string|null, legend?: b|t|l|r|null, dataLabels?: bool, gridlines?: bool, palette?, binCount?: n|null, binSize?: n|null, subtotals?: [point index], quartiles?: exclusive|inclusive, id?}",
+            "{title?: string|null, legend?: b|t|l|r|null, dataLabels?: bool, gridlines?: bool, palette?, binCount?: n|null, binSize?: n|null, subtotals?: [point index], quartiles?: exclusive|inclusive, upDownBars?: bool, id?}",
             has_selection,
             chart_options
         ),
@@ -733,6 +733,10 @@ fn chart_options(s: &mut Session, p: &Value) -> Result<Value> {
             t.dedup();
             c.subtotals = t;
         }
+        if let Some(b) = p.get("upDownBars").and_then(Value::as_bool) {
+            c.up_down_bars = b;
+            c.raw = None;
+        }
         if let Some(q) = p.get("quartiles").and_then(Value::as_str) {
             c.inclusive_quartiles = q.eq_ignore_ascii_case("inclusive");
             c.raw = None;
diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index 5b646f53..84a7d27f 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -217,6 +217,10 @@ pub struct Chart {
     /// Box and whisker quartiles by the inclusive method (QUARTILE.INC) instead of exclusive.
     #[serde(skip_serializing_if = "std::ops::Not::not")]
     pub inclusive_quartiles: bool,
+    /// A stock chart's up/down bars (`c:upDownBars`): open-high-low-close, the box between
+    /// the first and last series, hollow when the price rose.
+    #[serde(skip_serializing_if = "std::ops::Not::not")]
+    pub up_down_bars: bool,
     /// A histogram's bin count (`cx:binCount`); with neither this nor `bin_size` the bins are
     /// automatic (Scott's rule, as Excel does).
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -266,6 +270,7 @@ impl Default for Chart {
             subtotals: vec![],
             category_levels: vec![],
             inclusive_quartiles: false,
+            up_down_bars: false,
             bin_count: None,
             bin_size: None,
             raw: None,
@@ -309,6 +314,15 @@ impl Chart {
             c.legend = (kind == ChartType::BoxWhisker).then(|| "b".to_string());
             return c;
         }
+        if kind == ChartType::Stock {
+            // High-low-close over five days, the series in the order PowerPoint expects.
+            c.categories = ["Mon", "Tue", "Wed", "Thu", "Fri"].iter().map(|s| s.to_string()).collect();
+            let hlc = [("High", [55.0, 57.0, 57.0, 58.0, 58.0]), ("Low", [11.0, 12.0, 13.0, 11.0, 25.0]), ("Close", [25.0, 38.0, 50.0, 35.0, 43.0])];
+            for (name, v) in hlc {
+                c.series.push(Series { name: name.into(), values: v.iter().map(|x| Some(*x)).collect(), ..Default::default() });
+            }
+            return c;
+        }
         let n_series =
             if matches!(kind, ChartType::Pie | ChartType::Doughnut | ChartType::Funnel | ChartType::Waterfall | ChartType::Treemap) { 1 } else { 3 };
         for s in 0..n_series {
@@ -320,6 +334,12 @@ impl Chart {
             });
         }
         c.vary_colors = n_series == 1;
+        if kind == ChartType::Combo {
+            // Columns with the last series as a line, as PowerPoint's combo starts.
+            for (i, s) in c.series.iter_mut().enumerate() {
+                s.kind = Some(if i + 1 == n_series { ChartType::Line } else { ChartType::Column });
+            }
+        }
         c
     }
     /// A series' own chart type: its own in a combo chart (columns when it names none), else the
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 7cecf457..63e7fa24 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -166,7 +166,10 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
                     ChartType::Radar
                 }
             }
-            "stockChart" => ChartType::Stock,
+            "stockChart" => {
+                c.up_down_bars = g.child("upDownBars").is_some();
+                ChartType::Stock
+            }
             "surfaceChart" | "surface3DChart" => ChartType::Surface,
             _ => continue,
         };
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 7b8c1718..4f399d33 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -121,11 +121,13 @@ enum Group {
     Scatter,
     Radar,
     Bubble,
+    Stock,
 }
 
 fn group_of(k: ChartType) -> Group {
     match k {
-        ChartType::Line | ChartType::LineMarkers | ChartType::StackedLine | ChartType::Stock => Group::Line,
+        ChartType::Line | ChartType::LineMarkers | ChartType::StackedLine => Group::Line,
+        ChartType::Stock => Group::Stock,
         ChartType::Area | ChartType::StackedArea | ChartType::Surface => Group::Area,
         ChartType::Pie => Group::Pie,
         ChartType::Doughnut | ChartType::Sunburst => Group::Doughnut,
@@ -143,7 +145,32 @@ fn series(w: &mut W, c: &Chart, s: &Series, i: usize, kind: ChartType, g: Group)
     w.open0("c:tx");
     str_cache(w, &format!("Sheet1!${}$1", col(i + 1)), std::slice::from_ref(&s.name));
     w.close("c:tx");
-    sp_pr(w, s.fill.as_ref(), s.line.as_ref());
+    if g == Group::Stock && s.line.is_none() {
+        // A stock chart's series are points joined by the high-low lines, not lines of their own.
+        w.open0("c:spPr");
+        w.open("a:ln", A::new().a("w", 19050));
+        w.empty0("a:noFill");
+        w.close("a:ln");
+        w.close("c:spPr");
+    } else {
+        sp_pr(w, s.fill.as_ref(), s.line.as_ref());
+    }
+    if g == Group::Stock {
+        // High-low-close: the close is a dash on the high-low line; with up/down bars (or a set
+        // marker) the series keep their own.
+        let close = !c.up_down_bars && i + 1 == c.series.len() && c.series.len() == 3;
+        let sym = s.marker.as_deref().filter(|m| !m.is_empty() && m.chars().all(|ch| ch.is_ascii_alphanumeric())).unwrap_or(if close {
+            "dash"
+        } else {
+            "none"
+        });
+        w.open0("c:marker");
+        w.val("c:symbol", sym);
+        if sym != "none" {
+            w.val("c:size", 7);
+        }
+        w.close("c:marker");
+    }
     if g == Group::Bar {
         w.val("c:invertIfNegative", 0);
     }
@@ -323,6 +350,7 @@ fn plot_group(w: &mut W, c: &Chart, kind: ChartType, list: &[(usize, &Series)])
         Group::Scatter => "c:scatterChart",
         Group::Radar => "c:radarChart",
         Group::Bubble => "c:bubbleChart",
+        Group::Stock => "c:stockChart",
     };
     w.open0(tag);
     match g {
@@ -335,7 +363,10 @@ fn plot_group(w: &mut W, c: &Chart, kind: ChartType, list: &[(usize, &Series)])
         Group::Radar => w.val("c:radarStyle", if kind == ChartType::FilledRadar { "filled" } else { "marker" }),
         _ => {}
     }
-    w.val("c:varyColors", vary);
+    // `c:stockChart` has no `c:varyColors`.
+    if g != Group::Stock {
+        w.val("c:varyColors", vary);
+    }
     for (i, s) in list {
         series(w, c, s, *i, kind, g);
     }
@@ -351,6 +382,24 @@ fn plot_group(w: &mut W, c: &Chart, kind: ChartType, list: &[(usize, &Series)])
             }
         }
         Group::Line => w.val("c:marker", 1),
+        Group::Stock => {
+            w.open0("c:hiLowLines");
+            w.open0("c:spPr");
+            w.open("a:ln", A::new().a("w", 9525));
+            w.open0("a:solidFill");
+            w.empty("a:schemeClr", A::new().a("val", "tx1"));
+            w.close("a:solidFill");
+            w.close("a:ln");
+            w.close("c:spPr");
+            w.close("c:hiLowLines");
+            if c.up_down_bars {
+                w.open0("c:upDownBars");
+                w.val("c:gapWidth", 150);
+                w.empty0("c:upBars");
+                w.empty0("c:downBars");
+                w.close("c:upDownBars");
+            }
+        }
         Group::Pie => w.val("c:firstSliceAng", 0),
         Group::Doughnut => {
             w.val("c:firstSliceAng", 0);
@@ -475,6 +524,7 @@ pub fn chart_xml(c: &Chart) -> Vec<u8> {
                 | ChartType::Bubble
                 | ChartType::Radar
                 | ChartType::FilledRadar
+                | ChartType::Stock
         ) {
             log::warn!("pptx: {} chart written as a column chart", c.kind.label());
         }
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index ae144dd0..83a76180 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -1197,3 +1197,37 @@ fn chartex_levels_and_quartiles_round_trip() {
         assert_eq!(chart(&deckcraft_pptx::import(&again).unwrap()).unwrap().category_levels, before.category_levels, "{ty}");
     }
 }
+
+/// Radar, stock (with and without up/down bars) and combo charts keep their own plot groups
+/// through a save and reopen, written as PowerPoint writes them.
+#[test]
+fn radar_stock_and_combo_round_trip() {
+    use deckcraft_engine::Session;
+    let chart = |d: &Presentation| -> Option<Chart> {
+        d.slides.iter().flat_map(|s| s.shapes.iter()).find_map(|sh| match &sh.kind {
+            ShapeKind::Chart(c) => Some((**c).clone()),
+            _ => None,
+        })
+    };
+    for (ty, bars) in [("radar", false), ("filledradar", false), ("stock", false), ("stock", true), ("combo", false)] {
+        let mut s = Session::with_new();
+        s.execute("slide.new", &serde_json::json!({"layout": "blank"})).unwrap();
+        s.execute("insert.chart", &serde_json::json!({"type": ty})).unwrap();
+        let id = s.doc().unwrap().selection.shapes[0].0;
+        if bars {
+            s.execute("chart.options", &serde_json::json!({"id": id, "upDownBars": true})).unwrap();
+        }
+        let before = chart(&s.doc().unwrap().doc).unwrap();
+        let out = deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap();
+        let after = chart(&deckcraft_pptx::import(&out).unwrap()).unwrap();
+        assert_eq!(after.kind, before.kind, "{ty}");
+        assert_eq!(after.up_down_bars, bars, "{ty}");
+        assert_eq!(after.series.len(), before.series.len(), "{ty}");
+        let kinds: Vec<_> = after.series.iter().map(|x| after.series_kind(x)).collect();
+        let want: Vec<_> = before.series.iter().map(|x| before.series_kind(x)).collect();
+        assert_eq!(kinds, want, "{ty}");
+        for (a, b) in after.series.iter().zip(&before.series) {
+            assert_eq!(a.values, b.values, "{ty}");
+        }
+    }
+}
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index 140462b8..dda40b85 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -29,7 +29,7 @@ pub fn series_color(ctx: &Ctx, c: &Chart, i: usize) -> Rgba {
     }
 }
 
-fn series_fill(ctx: &Ctx, c: &Chart, i: usize, s: Option<&deckcraft_model::chart::Series>) -> Rgba {
+pub(crate) fn series_fill(ctx: &Ctx, c: &Chart, i: usize, s: Option<&deckcraft_model::chart::Series>) -> Rgba {
     match s.and_then(|s| s.fill.as_ref()) {
         Some(Fill::Solid { color: cc }) => ctx.color(cc, None),
         _ => series_color(ctx, c, i),
@@ -38,7 +38,7 @@ fn series_fill(ctx: &Ctx, c: &Chart, i: usize, s: Option<&deckcraft_model::chart
 
 /// A line series' colour: its line's own (where PowerPoint keeps it), else its fill's, else the
 /// palette's.
-fn series_line(ctx: &Ctx, c: &Chart, i: usize, s: &deckcraft_model::chart::Series) -> Rgba {
+pub(crate) fn series_line(ctx: &Ctx, c: &Chart, i: usize, s: &deckcraft_model::chart::Series) -> Rgba {
     match s.line.as_ref().and_then(|l| l.fill.as_ref()) {
         Some(Fill::Solid { color: cc }) => ctx.color(cc, None),
         _ => series_fill(ctx, c, i, Some(s)),
@@ -279,6 +279,10 @@ fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64,
         crate::chartex::draw(ctx, rctx, c, m, area, base, text_col);
         return;
     }
+    if matches!(c.kind, ChartType::Radar | ChartType::FilledRadar) {
+        crate::radar::draw(ctx, rctx, c, m, area, base, text_col);
+        return;
+    }
     let combo = c.kind == ChartType::Combo;
     // Bars are drawn first and lines over them; a combo chart has both.
     let bar_kind = c.series.iter().map(|s| c.series_kind(s)).find(|k| k.is_bar_like());
@@ -510,11 +514,17 @@ fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64,
             }
         }
     }
-    // Lines, areas, scatter, radar (drawn as lines): the series that aren't bars.
+    // A stock chart's high-low lines and up/down bars (or close dashes) stand in for its series.
+    if c.kind == ChartType::Stock {
+        for i in 0..ncat {
+            crate::radar::stock_marks(ctx, rctx, c, m, plot.x0 + band * (i as f64 + 0.5), band, i, &|v| to_axis(false, v));
+        }
+    }
+    // Lines, areas, scatter: the series that aren't bars.
     let mut acc = vec![0.0; ncat];
     for (si, s) in c.series.iter().enumerate() {
         let kind = c.series_kind(s);
-        if kind.is_bar_like() {
+        if kind.is_bar_like() || kind == ChartType::Stock {
             continue;
         }
         let sec = c.on_secondary(s);
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index e6570c5c..98b54a57 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -24,6 +24,7 @@ mod pattern;
 
 mod pathgrad;
 mod placed;
+mod radar;
 mod ramp;
 mod table;
 mod transition;
diff --git a/crates/render/src/radar.rs b/crates/render/src/radar.rs
new file mode 100644
index 00000000..3416c7ce
--- /dev/null
+++ b/crates/render/src/radar.rs
@@ -0,0 +1,187 @@
+//! Radar charts: one spoke per category, the value axis running up the first spoke, a polygon
+//! of gridlines per major unit and each series a closed polygon (filled for a filled radar).
+
+use deckcraft_color::Rgba;
+use deckcraft_model::chart::{Chart, ChartType};
+use deckcraft_model::resolve::Ctx;
+use deckcraft_model::text::{Align, Anchor};
+use kurbo::{Affine, BezPath, Point, Rect, Shape as _};
+use vello_cpu::RenderContext;
+
+use crate::chart::{label, series_fill, series_line};
+use crate::color;
+
+/// The point at `frac` of the radius along spoke `i` of `n` (the first spoke points up).
+fn spoke(cen: Point, r: f64, i: usize, n: usize, frac: f64) -> Point {
+    let a = -std::f64::consts::FRAC_PI_2 + std::f64::consts::TAU * i as f64 / n.max(1) as f64;
+    Point::new(cen.x + r * frac * a.cos(), cen.y + r * frac * a.sin())
+}
+
+pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, area: Rect, base: f64, text_col: Rgba) {
+    let n = c.categories.len().max(c.series.iter().map(|s| s.values.len()).max().unwrap_or(0));
+    if n < 3 {
+        // Fewer than three spokes make no polygon; PowerPoint draws a line, we draw nothing.
+        return;
+    }
+    let grid_col = Rgba::rgb(0xD9, 0xD9, 0xD9);
+    // Room for the category labels around the outside.
+    let r = (area.width().min(area.height()) / 2.0 - base * 1.9).max(base);
+    let cen = area.center();
+    let (min, max, step) = c.axis_scale(false, 5).unwrap_or((0.0, 1.0, 0.2));
+    let span = (max - min).max(1e-9);
+    let ticks = (((max - min) / step.max(1e-12)).round() as i64).clamp(1, 20);
+    ctx.set_transform(m);
+    ctx.set_stroke(kurbo::Stroke::new(0.75));
+    ctx.set_paint(color(grid_col, 1.0));
+    if c.gridlines {
+        for k in 1..=ticks {
+            let frac = k as f64 / ticks as f64;
+            let mut p = BezPath::new();
+            for i in 0..n {
+                let q = spoke(cen, r, i, n, frac);
+                if i == 0 { p.move_to(q) } else { p.line_to(q) }
+            }
+            p.close_path();
+            ctx.stroke_path(&p);
+        }
+    }
+    for i in 0..n {
+        let mut p = BezPath::new();
+        p.move_to(cen);
+        p.line_to(spoke(cen, r, i, n, 1.0));
+        ctx.set_transform(m);
+        ctx.set_paint(color(grid_col, 1.0));
+        ctx.stroke_path(&p);
+        if let Some(name) = c.categories.get(i) {
+            let q = spoke(cen, r + base * 1.3, i, n, 1.0);
+            let w = name.chars().count() as f64 * base * 0.55 + base;
+            let align = if (q.x - cen.x).abs() < base {
+                Align::Center
+            } else if q.x > cen.x {
+                Align::Left
+            } else {
+                Align::Right
+            };
+            let x0 = match align {
+                Align::Left => q.x - base * 0.3,
+                Align::Right => q.x - w + base * 0.3,
+                _ => q.x - w / 2.0,
+            };
+            label(ctx, rctx, m, name, Rect::new(x0, q.y - base * 0.7, x0 + w, q.y + base * 0.7), base, align, Anchor::Middle, text_col, false);
+        }
+    }
+    // Value labels up the first spoke.
+    if !c.y_hidden {
+        for k in 0..=ticks {
+            let v = min + step * k as f64;
+            let q = spoke(cen, r, 0, n, k as f64 / ticks as f64);
+            let t = c.axis_label(false, v);
+            let w = t.chars().count() as f64 * base * 0.55 + base * 0.4;
+            label(
+                ctx,
+                rctx,
+                m,
+                &t,
+                Rect::new(q.x - w - base * 0.3, q.y - base * 0.6, q.x - base * 0.3, q.y + base * 0.6),
+                base * 0.9,
+                Align::Right,
+                Anchor::Middle,
+                text_col,
+                false,
+            );
+        }
+    }
+    let filled = c.kind == ChartType::FilledRadar;
+    for (si, s) in c.series.iter().enumerate() {
+        let pts: Vec<Point> = (0..n)
+            .map(|i| {
+                let v = s.values.get(i).copied().flatten().unwrap_or(min);
+                spoke(cen, r, i, n, ((v - min) / span).clamp(0.0, 1.2))
+            })
+            .collect();
+        let mut p = BezPath::new();
+        for (i, q) in pts.iter().enumerate() {
+            if i == 0 { p.move_to(*q) } else { p.line_to(*q) }
+        }
+        p.close_path();
+        ctx.set_transform(m);
+        if filled {
+            ctx.set_paint(color(series_fill(rctx, c, si, Some(s)), 0.75));
+            ctx.fill_path(&p);
+        } else {
+            let col = series_line(rctx, c, si, s);
+            let lw = s.line.as_ref().and_then(|l| l.width).filter(|w| w.is_finite() && *w > 0.0).unwrap_or(2.25).clamp(0.25, 20.0);
+            ctx.set_paint(color(col, 1.0));
+            ctx.set_stroke(kurbo::Stroke::new(lw).with_join(kurbo::Join::Round));
+            ctx.stroke_path(&p);
+            if s.marker.is_some() {
+                for q in &pts {
+                    ctx.fill_path(&kurbo::Circle::new(*q, 3.5).to_path(0.1));
+                }
+            }
+        }
+        if c.data_labels || s.data_labels == Some(true) {
+            for (i, q) in pts.iter().enumerate() {
+                if let Some(v) = s.values.get(i).copied().flatten() {
+                    let t = c.data_label(s, v);
+                    label(
+                        ctx,
+                        rctx,
+                        m,
+                        &t,
+                        Rect::new(q.x - 40.0, q.y - base * 1.4, q.x + 40.0, q.y - base * 0.2),
+                        base * 0.9,
+                        Align::Center,
+                        Anchor::Bottom,
+                        text_col,
+                        false,
+                    );
+                }
+            }
+        }
+    }
+}
+
+/// A stock chart's marks at one category: the high-low line, then the up/down bar between the
+/// first (open) and last (close) series, else a dash at the close.
+#[allow(clippy::too_many_arguments)]
+pub fn stock_marks(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, x: f64, band: f64, i: usize, to_y: &dyn Fn(f64) -> f64) {
+    let vals: Vec<f64> = c.series.iter().filter_map(|s| s.values.get(i).copied().flatten()).collect();
+    if vals.len() < 2 {
+        return;
+    }
+    let hi = vals.iter().copied().fold(f64::MIN, f64::max);
+    let lo = vals.iter().copied().fold(f64::MAX, f64::min);
+    let ink = Rgba::rgb(0x40, 0x40, 0x40);
+    ctx.set_transform(m);
+    ctx.set_paint(color(ink, 1.0));
+    ctx.set_stroke(kurbo::Stroke::new(1.0));
+    let mut p = BezPath::new();
+    p.move_to((x, to_y(hi)));
+    p.line_to((x, to_y(lo)));
+    ctx.stroke_path(&p);
+    let open = c.series.first().and_then(|s| s.values.get(i).copied().flatten());
+    let close = c.series.last().and_then(|s| s.values.get(i).copied().flatten());
+    if c.up_down_bars && c.series.len() >= 4 {
+        let (Some(o), Some(cl)) = (open, close) else { return };
+        let w = band * 0.4;
+        let (y0, y1) = (to_y(o.max(cl)), to_y(o.min(cl)));
+        let r = Rect::new(x - w / 2.0, y0, x + w / 2.0, y1.max(y0 + 1.0));
+        // PowerPoint's default: white when the price rose, dark when it fell.
+        ctx.set_paint(color(if cl >= o { Rgba::WHITE } else { ink }, 1.0));
+        ctx.fill_rect(&r);
+        ctx.set_paint(color(ink, 1.0));
+        ctx.stroke_path(&r.to_path(0.1));
+        return;
+    }
+    if let Some(cl) = close {
+        let col = c.series.last().map(|s| series_line(rctx, c, c.series.len() - 1, s)).unwrap_or(ink);
+        let y = to_y(cl);
+        let mut d = BezPath::new();
+        d.move_to((x - band * 0.12, y));
+        d.line_to((x + band * 0.12, y));
+        ctx.set_paint(color(col, 1.0));
+        ctx.set_stroke(kurbo::Stroke::new(2.5));
+        ctx.stroke_path(&d);
+    }
+}
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 28fe9887..ce8f4b3a 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1834,3 +1834,52 @@ fn region_map_draws_tiles_on_its_colour_scale() {
     }
     assert!(seen.len() >= 5, "{} colours", seen.len());
 }
+
+/// Radar charts are polar, stock charts draw high-low lines (and up/down bars), and a combo
+/// chart draws its line series over its columns.
+#[test]
+fn radar_stock_and_combo_draw_their_own_layouts() {
+    let mut ohlc = Chart::sample(ChartType::Stock);
+    ohlc.series.insert(
+        0,
+        deckcraft_model::chart::Series {
+            name: "Open".into(),
+            values: [44.0, 25.0, 38.0, 50.0, 35.0].iter().map(|v| Some(*v)).collect(),
+            ..Default::default()
+        },
+    );
+    ohlc.up_down_bars = true;
+    let charts = [
+        ("Radar", Chart::sample(ChartType::Radar)),
+        ("FilledRadar", Chart::sample(ChartType::FilledRadar)),
+        ("Stock", Chart::sample(ChartType::Stock)),
+        ("StockOHLC", ohlc),
+        ("Combo", Chart::sample(ChartType::Combo)),
+    ];
+    for (name, c) in charts {
+        let sh = Shape {
+            id: ShapeId(625),
+            xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)),
+            kind: ShapeKind::Chart(Box::new(c.clone())),
+            ..Default::default()
+        };
+        let img = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+        if let Ok(dir) = std::env::var("DECKCRAFT_CHART_SHOTS") {
+            let _ = std::fs::write(format!("{dir}/{name}.png"), img.to_png());
+        }
+        let ink = |x: u32, y: u32| img.pixel(x, y)[..3] != [255, 255, 255];
+        match name {
+            // The radar's top spoke runs straight up from the centre; a line chart has nothing there.
+            "Radar" | "FilledRadar" => assert!((150..260).any(|y| ink(480, y)), "{name}"),
+            // No series lines: well right of the first category there is only gridline grey.
+            "Stock" | "StockOHLC" => {
+                let coloured = (60..480).step_by(2).flat_map(|y| (40..920).step_by(4).map(move |x| (x, y))).any(|(x, y)| {
+                    let p = img.pixel(x, y);
+                    p[2] > p[0].saturating_add(60)
+                });
+                assert!(!coloured || name == "Stock", "{name}: series drawn as lines");
+            }
+            _ => {}
+        }
+    }
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index 85dae7b9..3cff27e0 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -152,7 +152,10 @@ Detail in [file-format-parity.md](file-format-parity.md).
   have their own layouts, histograms and Paretos bin their data (count, width or Scott's rule),
   and box & whisker charts use exclusive or inclusive quartiles with 1.5 IQR whiskers. Region maps are kept
   (their cached geography too, also through edits) and drawn as value-coloured tiles with a
-  colour scale, since DeckCraft ships no map boundaries.
+  colour scale, since DeckCraft ships no map boundaries. Radar charts are drawn polar (filled
+  or lines), stock charts as high-low lines with close dashes or up/down bars and saved as
+  `c:stockChart`, and combo charts start as columns with a line. Secondary-axis writing and
+  trendlines are tracked separately.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 

From 7e4e628b1353ca61d229a178fcb8ae1a9ca15827 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:32:31 +0300
Subject: [PATCH 222/376] =?UTF-8?q?Render:=20omit=20the=20moving-average?=
 =?UTF-8?q?=20R=C2=B2=20label?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

PowerPoint does not show R² for a moving average, and the value can be
negative. The line is still drawn.
---
 crates/model/src/trendline.rs | 15 ++++++++++++---
 docs/gaps.md                  |  4 +++-
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/crates/model/src/trendline.rs b/crates/model/src/trendline.rs
index eeddd2bd..f893a764 100644
--- a/crates/model/src/trendline.rs
+++ b/crates/model/src/trendline.rs
@@ -137,8 +137,9 @@ impl Trendline {
         Some(TrendFit { kind: self.kind, model, r2: r_squared(&used_y, &yhat), x_min, x_max })
     }
 
-    /// The equation and R² lines this trendline asks to show. Empty when neither is on, and a
-    /// moving average has no equation.
+    /// The equation and R² lines this trendline asks to show. Empty when neither is on. A moving
+    /// average has no equation, and PowerPoint does not show its R², so that label is left off
+    /// even when the file asks for it.
     pub fn caption(&self, fit: &TrendFit) -> String {
         let mut lines = Vec::new();
         if self.disp_eq
@@ -146,7 +147,7 @@ impl Trendline {
         {
             lines.push(eq);
         }
-        if self.disp_r_sqr {
+        if self.disp_r_sqr && self.kind != TrendlineType::MovingAvg {
             lines.push(fit.r2_label());
         }
         lines.join("\n")
@@ -599,6 +600,14 @@ mod tests {
         assert_eq!(fit.span(Some(4.0), Some(4.0)), (2.0, 4.0));
     }
 
+    #[test]
+    fn moving_average_shows_neither_equation_nor_r2() {
+        let t = Trendline { kind: TrendlineType::MovingAvg, period: Some(2), disp_eq: true, disp_r_sqr: true, ..Default::default() };
+        let fit = t.fit(&[1.0, 2.0, 3.0, 4.0], &[2.0, 8.0, 4.0, 10.0]).expect("ma");
+        assert!(fit.r2_label().starts_with("R² ="));
+        assert!(t.caption(&fit).is_empty(), "{}", t.caption(&fit));
+    }
+
     #[test]
     fn too_few_points_and_non_finite_input_fit_nothing() {
         assert!(line(TrendlineType::Linear).fit(&[1.0], &[2.0]).is_none());
diff --git a/docs/gaps.md b/docs/gaps.md
index c3b955b2..831deb9e 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -150,7 +150,8 @@ Detail in [file-format-parity.md](file-format-parity.md).
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
   whisker) aren't read. Trendlines round-trip (`corpus_charts.rs`) and are drawn: linear,
   exponential, logarithmic, polynomial, power and moving average, with forecast and the equation
-  and R² label. A combo chart's secondary value axis is read (`y2_*`, `Series.secondary_axis`) and
+  and R² label. A moving average is drawn with neither label. A combo chart's secondary value axis
+  is read (`y2_*`, `Series.secondary_axis`) and
   is not written back when the chart is rebuilt.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
@@ -261,6 +262,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | A moving average trendline is drawn without an equation or an R² label |
 | 2026-10-14 | minor | Chart trendlines are drawn (six types, forecast, equation and R²). The charts gap stays open for the data grid, chartex and secondary-axis export; the real-deck corpus gap stays open |
 | 2026-10-14 | minor | Chart trendlines round-trip. The real-deck corpus gap stays open; secondary-axis export and drawing trendlines stay in the charts gap |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |

From 1866de9895d8ae1b7f76a98b33d190d07756de2c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:42:52 +0300
Subject: [PATCH 223/376] SmartArt: 15 layouts, SmartArt Styles and Change
 Colors

Layouts now include Vertical and Horizontal Bullet List, Basic Block List,
Basic/Chevron/Vertical/Step Up Process, Basic and Block Cycle, Basic Radial,
Basic and Inverted Pyramid (bands drawn as polygons so the slope and the
text stay right), Basic and Titled Matrix, and Hierarchy. Each layout says
which nodes each shape shows, so typed text maps back for any layout.

SmartArt Styles (flat, subtle, intense, white outline) and Change Colors
(colourful or one accent) are kept on the diagram, offered in the SmartArt
Design tab, and written to .pptx as quick style / colour definition ids
(and read back from them).

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/smartart.rs | 463 ++++++++++++++++++++++++++----
 crates/engine/src/tests.rs        |   5 +-
 crates/model/src/lib.rs           |   9 +-
 crates/pptx/src/dgm.rs            | 164 +++++++++--
 crates/pptx/src/read/shapes.rs    |   5 +
 crates/pptx/src/write/shapes.rs   |   4 +-
 crates/ui-egui/src/ribbon.rs      |  31 +-
 docs/gaps.md                      |   6 +-
 8 files changed, 585 insertions(+), 102 deletions(-)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index cfca7620..331dabec 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -7,8 +7,11 @@
 
 use deckcraft_color::SchemeSlot;
 use deckcraft_geom::Xfrm;
+use deckcraft_model::style::{Gradient, GradientShape, GradientStop, Shadow};
 use deckcraft_model::text::{Align, AutoFit, Paragraph, TextBody};
-use deckcraft_model::{Diagram, DiagramNode, Fill, Geom, Presentation, Shape, ShapeId, ShapeKind, ShapeStyle};
+use deckcraft_model::{
+    ColorRef, ColorTransform, Diagram, DiagramNode, Effects, Fill, Geom, Line, Presentation, Shape, ShapeId, ShapeKind, ShapeStyle,
+};
 use serde_json::{Value, json};
 
 use super::*;
@@ -19,7 +22,41 @@ pub const MAX_LEVEL: u8 = 8;
 /// Most top-level shapes a layout draws.
 const MAX_SHAPES: usize = 40;
 
-pub const KINDS: [&str; 6] = ["list", "process", "cycle", "hierarchy", "pyramid", "matrix"];
+/// DeckCraft's layouts, with the names PowerPoint's gallery gives them.
+pub const LAYOUTS: [(&str, &str); 15] = [
+    ("list", "Vertical Bullet List"),
+    ("blockList", "Basic Block List"),
+    ("hBulletList", "Horizontal Bullet List"),
+    ("process", "Basic Process"),
+    ("chevron", "Basic Chevron Process"),
+    ("verticalProcess", "Vertical Process"),
+    ("stepUp", "Step Up Process"),
+    ("cycle", "Basic Cycle"),
+    ("blockCycle", "Block Cycle"),
+    ("radial", "Basic Radial"),
+    ("hierarchy", "Hierarchy"),
+    ("pyramid", "Basic Pyramid"),
+    ("invertedPyramid", "Inverted Pyramid"),
+    ("matrix", "Basic Matrix"),
+    ("titledMatrix", "Titled Matrix"),
+];
+/// SmartArt Styles.
+pub const STYLES: [(&str, &str); 4] =
+    [("flat", "Simple Fill"), ("subtle", "Subtle Effect"), ("intense", "Intense Effect"), ("outline", "White Outline")];
+/// Change Colors.
+pub const COLORS: [(&str, &str); 7] = [
+    ("colorful", "Colorful"),
+    ("accent1", "Accent 1"),
+    ("accent2", "Accent 2"),
+    ("accent3", "Accent 3"),
+    ("accent4", "Accent 4"),
+    ("accent5", "Accent 5"),
+    ("accent6", "Accent 6"),
+];
+
+pub fn is_kind(k: &str) -> bool {
+    LAYOUTS.iter().any(|(id, _)| *id == k)
+}
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![
@@ -66,10 +103,28 @@ pub fn specs() -> Vec<CommandSpec> {
             "Change Layout",
             ["SmartArt Design", "Layouts"],
             None,
-            "{id?, kind: list|process|cycle|hierarchy|pyramid|matrix}",
+            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix}",
             has_selection,
             change_layout
         ),
+        cmd!(
+            "smartArt.style",
+            "SmartArt Styles",
+            ["SmartArt Design", "SmartArt Styles"],
+            None,
+            "{id?, style: flat|subtle|intense|outline}",
+            has_selection,
+            change_style
+        ),
+        cmd!(
+            "smartArt.colors",
+            "Change Colors",
+            ["SmartArt Design", "SmartArt Styles"],
+            None,
+            "{id?, colors: colorful|accent1|…|accent6}",
+            has_selection,
+            change_colors
+        ),
     ]
 }
 
@@ -175,11 +230,11 @@ pub fn demote_node(nodes: &mut [DiagramNode], i: usize) -> bool {
     true
 }
 
-/// Which nodes each generated text shape shows, in child order (lines drawn after these carry none).
-fn node_map(d: &Diagram) -> Vec<Vec<usize>> {
-    if d.kind == "hierarchy" {
-        return (0..d.nodes.len().min(MAX_SHAPES)).map(|i| vec![i]).collect();
-    }
+/// A generated shape and the nodes whose text it shows (none for arrows and lines).
+type Item = (Shape, Vec<usize>);
+
+/// Top-level nodes, each with its sub-points.
+fn groups(d: &Diagram) -> Vec<Vec<usize>> {
     let mut out: Vec<Vec<usize>> = vec![];
     for (i, n) in d.nodes.iter().enumerate() {
         match out.last_mut() {
@@ -187,8 +242,7 @@ fn node_map(d: &Diagram) -> Vec<Vec<usize>> {
             _ => out.push(vec![i]),
         }
     }
-    let cap = if d.kind == "matrix" { 4 } else { MAX_SHAPES };
-    out.truncate(cap);
+    out.truncate(MAX_SHAPES);
     out
 }
 
@@ -197,9 +251,10 @@ fn sync_text(d: &mut Diagram, children: &[Shape]) {
     if d.imported {
         return;
     }
-    for (shape, idx) in children.iter().zip(node_map(d)) {
+    let map: Vec<Vec<usize>> = layout_items(d, Xfrm::new(0.0, 0.0, 100.0, 100.0)).into_iter().map(|(_, m)| m).collect();
+    for (shape, idx) in children.iter().zip(map) {
         let Some(body) = &shape.text else { continue };
-        if body.paragraphs.len() != idx.len() {
+        if idx.is_empty() || body.paragraphs.len() != idx.len() {
             continue;
         }
         for (p, i) in body.paragraphs.iter().zip(idx) {
@@ -214,13 +269,91 @@ fn slot(i: usize) -> SchemeSlot {
     [SchemeSlot::Accent1, SchemeSlot::Accent2, SchemeSlot::Accent3, SchemeSlot::Accent4, SchemeSlot::Accent5, SchemeSlot::Accent6][i % 6]
 }
 
-fn text_shape(preset: &str, x: Xfrm, color: usize, lines: &[&DiagramNode]) -> Shape {
+/// The accent shape `i` is drawn in under Change Colors: `colorful` cycles the accents, `accentN`
+/// keeps one.
+fn accent(d: &Diagram, i: usize) -> SchemeSlot {
+    match d.colors.strip_prefix("accent").and_then(|n| n.parse::<usize>().ok()) {
+        Some(n @ 1..=6) => slot(n - 1),
+        _ => slot(i),
+    }
+}
+
+/// Fill, outline, text colour and effects for the SmartArt style. `light` shapes (the bullet
+/// boxes of the bullet lists) are a pale tint of the accent with dark text.
+fn paint(d: &Diagram, sh: &mut Shape, i: usize, light: bool) {
+    let a = accent(d, i);
+    let base = ColorRef::scheme(a);
+    let tint = |pct: i32| ColorRef::scheme(a).with(ColorTransform::LumMod(100_000 - pct * 1000)).with(ColorTransform::LumOff(pct * 1000));
+    let dark_text = light || d.style == "outline";
+    sh.style = Some(ShapeStyle::accent(a));
+    match d.style.as_str() {
+        _ if light => {
+            sh.fill = Some(Fill::solid(tint(80)));
+            sh.line = Some(Line::solid(tint(60), 1.0));
+        }
+        "outline" => {
+            sh.fill = Some(Fill::solid(ColorRef::scheme(SchemeSlot::Lt1)));
+            sh.line = Some(Line::solid(base.clone(), 2.25));
+        }
+        "subtle" => {
+            sh.fill = Some(Fill::solid(base.clone()));
+            sh.line = Some(Line::solid(ColorRef::scheme(SchemeSlot::Lt1), 1.5));
+            sh.effects = Some(Effects { outer_shadow: Some(shadow(4.0, 3.0)), ..Default::default() });
+        }
+        "intense" => {
+            sh.fill = Some(Fill::Gradient(Gradient {
+                stops: vec![
+                    GradientStop { pos: 0.0, color: tint(30) },
+                    GradientStop { pos: 1.0, color: base.clone().with(ColorTransform::LumMod(75_000)) },
+                ],
+                shape: GradientShape::Linear { angle: 90.0, scaled: false },
+                rotate_with_shape: true,
+                tile: [0.0; 4],
+            }));
+            sh.line = Some(Line::solid(ColorRef::scheme(SchemeSlot::Lt1), 1.0));
+            sh.effects = Some(Effects { outer_shadow: Some(shadow(8.0, 5.0)), ..Default::default() });
+        }
+        _ => {
+            sh.fill = Some(Fill::solid(base.clone()));
+            sh.line = Some(Line::solid(ColorRef::scheme(SchemeSlot::Lt1), 1.5));
+        }
+    }
+    if let Some(body) = &mut sh.text {
+        let c = if dark_text { ColorRef::scheme(SchemeSlot::Tx1) } else { ColorRef::scheme(SchemeSlot::Lt1) };
+        for p in &mut body.paragraphs {
+            for r in &mut p.runs {
+                r.props.fill = Some(Fill::solid(c.clone()));
+            }
+        }
+    }
+}
+
+fn shadow(blur: f64, dist: f64) -> Shadow {
+    Shadow {
+        color: ColorRef::rgb(deckcraft_model::Rgba { r: 0, g: 0, b: 0, a: 255 }).with(ColorTransform::Alpha(40_000)),
+        blur,
+        dist,
+        dir: 90.0,
+        inner: false,
+        sx: 1.0,
+        sy: 1.0,
+        kx: 0.0,
+        ky: 0.0,
+        align: String::new(),
+        rotate_with_shape: false,
+    }
+}
+
+/// A shape with text: the first line as the title (centred, larger), the rest as bullets. With
+/// `title` false every line is a bullet (the bullet boxes of the bullet lists).
+fn text_shape(preset: &str, x: Xfrm, lines: &[&DiagramNode], title: bool) -> Shape {
     let mut body = TextBody::default();
     body.body.autofit = Some(AutoFit::Shrink { font_scale: 1.0, line_reduction: 0.0 });
-    let top = lines.first().map(|n| n.level).unwrap_or(0);
+    let top = lines.first().map(|n| if title { n.level } else { n.level.saturating_sub(1) }).unwrap_or(0);
     for (k, n) in lines.iter().enumerate() {
         let mut para = Paragraph::new(&n.text);
-        if k == 0 {
+        let head = title && k == 0;
+        if head {
             para.props.align = Some(Align::Center);
         } else {
             para.level = n.level.saturating_sub(top).saturating_sub(1).min(MAX_LEVEL);
@@ -229,7 +362,7 @@ fn text_shape(preset: &str, x: Xfrm, color: usize, lines: &[&DiagramNode]) -> Sh
             para.props.margin_left = Some(12.0 * (para.level as f64 + 1.0));
             para.props.indent = Some(-10.0);
         }
-        let size = if k == 0 { 20.0 } else { 14.0 };
+        let size = if head { 20.0 } else { 14.0 };
         for r in &mut para.runs {
             r.props.size = Some(size);
         }
@@ -239,14 +372,17 @@ fn text_shape(preset: &str, x: Xfrm, color: usize, lines: &[&DiagramNode]) -> Sh
     if body.paragraphs.is_empty() {
         body.paragraphs.push(Paragraph::new(""));
     }
-    Shape {
-        name: format!("SmartArt shape {}", color + 1),
-        xfrm: Some(x),
-        geom: Geom::preset(preset),
-        style: Some(ShapeStyle::accent(slot(color))),
-        text: Some(body),
-        ..Default::default()
+    if !title {
+        body.body.anchor = Some(deckcraft_model::text::Anchor::Top);
     }
+    Shape { name: "SmartArt shape".into(), xfrm: Some(x), geom: Geom::preset(preset), text: Some(body), ..Default::default() }
+}
+
+/// A plain shape with no text (arrows between steps).
+fn deco(preset: &str, x: Xfrm, rot: f64) -> Shape {
+    let mut x = x;
+    x.rot = rot;
+    Shape { name: "SmartArt arrow".into(), xfrm: Some(x), geom: Geom::preset(preset), ..Default::default() }
 }
 
 fn line_shape(a: (f64, f64), b: (f64, f64)) -> Shape {
@@ -256,63 +392,205 @@ fn line_shape(a: (f64, f64), b: (f64, f64)) -> Shape {
         name: "SmartArt connector".into(),
         xfrm: Some(x),
         geom: Geom::preset("line"),
-        style: Some(ShapeStyle::accent(SchemeSlot::Accent1)),
         fill: Some(Fill::None),
+        line: Some(Line::solid(ColorRef::scheme(SchemeSlot::Accent1).with(ColorTransform::LumMod(60_000)), 1.25)),
         ..Default::default()
     }
 }
 
 /// The diagram's shapes laid out in `area` (ids not yet assigned).
 pub fn layout(d: &Diagram, area: Xfrm) -> Vec<Shape> {
-    let map = node_map(d);
-    let groups: Vec<Vec<&DiagramNode>> = map.iter().map(|g| g.iter().filter_map(|i| d.nodes.get(*i)).collect()).collect();
-    let n = groups.len().max(1);
-    let mut out = vec![];
+    layout_items(d, area).into_iter().map(|(s, _)| s).collect()
+}
+
+/// Lay out `d`, painted with its style and colours, each shape with the nodes it shows.
+fn layout_items(d: &Diagram, area: Xfrm) -> Vec<Item> {
+    let gs = groups(d);
+    let nodes = |g: &[usize]| -> Vec<&DiagramNode> { g.iter().filter_map(|i| d.nodes.get(*i)).collect() };
+    let n = gs.len().max(1);
+    let nf = n as f64;
+    let mut out: Vec<Item> = vec![];
+    // A titled shape for top-level group `i`, painted in its accent.
+    let titled = |out: &mut Vec<Item>, preset: &str, x: Xfrm, i: usize, g: &[usize]| {
+        let mut sh = text_shape(preset, x, &nodes(g), true);
+        paint(d, &mut sh, i, false);
+        out.push((sh, g.to_vec()));
+    };
+    let arrow = |out: &mut Vec<Item>, x: Xfrm, rot: f64, i: usize| {
+        let mut sh = deco("rightArrow", x, rot);
+        paint(d, &mut sh, i, true);
+        out.push((sh, vec![]));
+    };
     match d.kind.as_str() {
         "hierarchy" => return hierarchy(d, area),
-        "cycle" => {
-            let r = area.h.min(area.w) * 0.38;
+        "list" | "hBulletList" => {
+            // Vertical / Horizontal Bullet List: a coloured title bar, sub-points in a pale box below.
+            let vertical = d.kind == "list";
+            for (i, g) in gs.iter().enumerate() {
+                let (cell, bar_h) = if vertical {
+                    (
+                        Xfrm::new(area.x, area.y + i as f64 * area.h / nf, area.w, area.h / nf * 0.92),
+                        (area.h / nf * 0.92).min(area.h * 0.12).max(18.0),
+                    )
+                } else {
+                    let w = area.w / nf;
+                    (Xfrm::new(area.x + i as f64 * w + w * 0.03, area.y, w * 0.94, area.h), area.h * 0.22)
+                };
+                let has_sub = g.len() > 1;
+                let bar_h = bar_h.min(cell.h);
+                titled(&mut out, "roundRect", Xfrm::new(cell.x, cell.y, cell.w, bar_h), i, &g[..1]);
+                if has_sub {
+                    let pad = cell.w * 0.03;
+                    let x = Xfrm::new(cell.x + pad, cell.y + bar_h, cell.w - 2.0 * pad, (cell.h - bar_h).max(1.0));
+                    let mut sh = text_shape("rect", x, &nodes(&g[1..]), false);
+                    paint(d, &mut sh, i, true);
+                    out.push((sh, g[1..].to_vec()));
+                }
+            }
+        }
+        "blockList" => {
+            // Basic Block List: equal blocks in rows, as square as the area allows.
+            let cols = ((nf * area.w / area.h.max(1.0) / 1.6).sqrt().ceil() as usize).clamp(1, n);
+            let rows = n.div_ceil(cols);
+            let (w, h) = (area.w / cols as f64, area.h / rows as f64);
+            let (bw, bh) = (w * 0.9, (h * 0.85).min(w * 0.9 * 0.6));
+            for (i, g) in gs.iter().enumerate() {
+                let (c, r) = (i % cols, i / cols);
+                let in_row = if r + 1 == rows { n - r * cols } else { cols };
+                let x0 = area.x + (area.w - in_row as f64 * w) / 2.0;
+                titled(&mut out, "rect", Xfrm::new(x0 + c as f64 * w + (w - bw) / 2.0, area.y + r as f64 * h + (h - bh) / 2.0, bw, bh), i, g);
+            }
+        }
+        "process" | "chevron" => {
+            let chevron = d.kind == "chevron";
+            let gap = if chevron { -area.w * 0.02 } else { area.w * 0.06 };
+            let w = ((area.w - gap * (nf - 1.0)) / nf).max(1.0);
+            let h = (area.h * 0.5).min(w * if chevron { 0.45 } else { 0.65 });
+            let y = area.y + (area.h - h) / 2.0;
+            for (i, g) in gs.iter().enumerate() {
+                let x = area.x + i as f64 * (w + gap);
+                titled(&mut out, if chevron { "chevron" } else { "roundRect" }, Xfrm::new(x, y, w, h), i, g);
+                if !chevron && i + 1 < n {
+                    let aw = gap * 0.7;
+                    arrow(&mut out, Xfrm::new(x + w + gap * 0.15, y + h / 2.0 - aw * 0.45, aw, aw * 0.9), 0.0, i);
+                }
+            }
+        }
+        "verticalProcess" => {
+            let gap = area.h * 0.06;
+            let h = ((area.h - gap * (nf - 1.0)) / nf).max(1.0);
+            let w = area.w * 0.6;
+            let x = area.x + (area.w - w) / 2.0;
+            for (i, g) in gs.iter().enumerate() {
+                let y = area.y + i as f64 * (h + gap);
+                titled(&mut out, "roundRect", Xfrm::new(x, y, w, h), i, g);
+                if i + 1 < n {
+                    let s = gap * 0.8;
+                    // A right arrow turned to point down.
+                    arrow(&mut out, Xfrm::new(area.x + area.w / 2.0 - s / 2.0, y + h + gap * 0.1, s, s), 90.0, i);
+                }
+            }
+        }
+        "stepUp" => {
+            // Step Up Process: each step higher than the one before.
+            let w = area.w / nf;
+            let h = area.h / (nf + 1.0) * 1.6;
+            for (i, g) in gs.iter().enumerate() {
+                let y = area.y + area.h - h - i as f64 * (area.h - h) / (nf - 1.0).max(1.0);
+                titled(&mut out, "rect", Xfrm::new(area.x + i as f64 * w + w * 0.04, y, w * 0.92, h), i, g);
+            }
+        }
+        "cycle" | "blockCycle" => {
+            let block = d.kind == "blockCycle";
+            let r = area.h.min(area.w) * 0.36;
             let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
-            let dd = r * 0.62;
-            for (i, g) in groups.iter().enumerate() {
-                let a = (i as f64 / n as f64 * 360.0 - 90.0).to_radians();
-                out.push(text_shape("ellipse", Xfrm::new(cx + r * a.cos() - dd / 2.0, cy + r * a.sin() - dd / 2.0, dd, dd), i, g));
+            let dd = (r * if block { 0.75 } else { 0.8 }).min(2.0 * std::f64::consts::PI * r / nf * 0.62);
+            for (i, g) in gs.iter().enumerate() {
+                let a = (i as f64 / nf * 360.0 - 90.0).to_radians();
+                let (w, h) = if block { (dd * 1.3, dd * 0.75) } else { (dd, dd) };
+                titled(
+                    &mut out,
+                    if block { "roundRect" } else { "ellipse" },
+                    Xfrm::new(cx + r * a.cos() - w / 2.0, cy + r * a.sin() - h / 2.0, w, h),
+                    i,
+                    g,
+                );
+                if n > 1 {
+                    // An arrow halfway to the next node, along the circle.
+                    let m = ((i as f64 + 0.5) / nf * 360.0 - 90.0).to_radians();
+                    let s = (dd * 0.35).max(6.0);
+                    let rot = (i as f64 + 0.5) / nf * 360.0;
+                    arrow(&mut out, Xfrm::new(cx + r * m.cos() - s / 2.0, cy + r * m.sin() - s * 0.4, s, s * 0.8), rot, i);
+                }
             }
         }
-        "pyramid" => {
-            let h = area.h / n as f64;
-            for (i, g) in groups.iter().enumerate() {
-                let w = area.w * 0.25 + area.w * 0.75 * (i as f64 + 1.0) / n as f64;
-                out.push(text_shape("trapezoid", Xfrm::new(area.x + (area.w - w) / 2.0, area.y + i as f64 * h, w, h * 0.95), i, g));
+        "radial" => {
+            // Basic Radial: the first node in the middle, the others around it with spokes.
+            let Some((centre, rest)) = gs.split_first() else { return out };
+            let m = rest.len().max(1) as f64;
+            let r = area.h.min(area.w) * 0.36;
+            let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
+            let dc = r * 0.75;
+            let dd = (r * 0.75).min(2.0 * std::f64::consts::PI * r / m * 0.7);
+            for (k, _) in rest.iter().enumerate() {
+                let a = (k as f64 / m * 360.0 - 90.0).to_radians();
+                let (ex, ey) = (cx + (r - dd / 2.0) * a.cos(), cy + (r - dd / 2.0) * a.sin());
+                out.push((line_shape((cx + dc / 2.0 * a.cos(), cy + dc / 2.0 * a.sin()), (ex, ey)), vec![]));
+            }
+            titled(&mut out, "ellipse", Xfrm::new(cx - dc / 2.0, cy - dc / 2.0, dc, dc), 0, centre);
+            for (k, g) in rest.iter().enumerate() {
+                let a = (k as f64 / m * 360.0 - 90.0).to_radians();
+                titled(&mut out, "ellipse", Xfrm::new(cx + r * a.cos() - dd / 2.0, cy + r * a.sin() - dd / 2.0, dd, dd), k + 1, g);
             }
         }
-        "matrix" => {
-            let (w, h) = (area.w / 2.0, area.h / 2.0);
-            for (i, g) in groups.iter().enumerate() {
-                let x = Xfrm::new(area.x + (i % 2) as f64 * w + 4.0, area.y + (i / 2) as f64 * h + 4.0, w - 8.0, h - 8.0);
-                out.push(text_shape("roundRect", x, i, g));
+        "pyramid" | "invertedPyramid" => {
+            // One triangle cut into bands; inverted, the wide band is on top. Each band is drawn as
+            // its own polygon so the sides keep the triangle's slope and the text stays upright.
+            let inverted = d.kind == "invertedPyramid";
+            let h = area.h / nf;
+            let pw = area.h.min(area.w) * 1.15;
+            let px = area.x + (area.w - pw) / 2.0;
+            for (i, g) in gs.iter().enumerate() {
+                let (a, b) = (i as f64 / nf, (i as f64 + 1.0) / nf);
+                let (t, bt) = if inverted { (1.0 - a, 1.0 - b) } else { (a, b) };
+                let (wt, wb) = (pw * t, pw * bt);
+                let w = wt.max(wb).max(1.0);
+                let bh = h * 0.96;
+                let x = px + (pw - w) / 2.0;
+                let (it, ib) = ((w - wt) / 2.0, (w - wb) / 2.0);
+                let path = format!("M {it:.2} 0 L {:.2} 0 L {:.2} {bh:.2} L {ib:.2} {bh:.2} Z", w - it, w - ib);
+                let mut sh = text_shape("rect", Xfrm::new(x, area.y + i as f64 * h, w, bh), &nodes(g), true);
+                sh.geom = Geom::Custom {
+                    paths: vec![deckcraft_model::CustomPath { w, h: bh, d: path, fill: deckcraft_geom::preset::FillMode::Norm, stroke: true }],
+                };
+                paint(d, &mut sh, i, false);
+                out.push((sh, g.clone()));
             }
         }
-        "list" => {
-            let h = area.h / n as f64;
-            for (i, g) in groups.iter().enumerate() {
-                out.push(text_shape("roundRect", Xfrm::new(area.x, area.y + i as f64 * h, area.w, h * 0.85), i, g));
+        "matrix" | "titledMatrix" => {
+            let titled_m = d.kind == "titledMatrix";
+            let s = area.h.min(area.w);
+            let (x0, y0) = (area.x + (area.w - s) / 2.0, area.y + (area.h - s) / 2.0);
+            let (quads, title): (&[Vec<usize>], Option<&Vec<usize>>) =
+                if titled_m { gs.split_first().map(|(t, r)| (r, Some(t))).unwrap_or((&[], None)) } else { (&gs, None) };
+            for (i, g) in quads.iter().take(4).enumerate() {
+                let x = Xfrm::new(x0 + (i % 2) as f64 * s / 2.0 + 3.0, y0 + (i / 2) as f64 * s / 2.0 + 3.0, s / 2.0 - 6.0, s / 2.0 - 6.0);
+                titled(&mut out, "roundRect", x, i + usize::from(titled_m), g);
             }
-        }
-        _ => {
-            let gap = 24.0;
-            let w = ((area.w - gap * (n as f64 - 1.0)) / n as f64).max(1.0);
-            for (i, g) in groups.iter().enumerate() {
-                let preset = if i + 1 < n { "homePlate" } else { "roundRect" };
-                out.push(text_shape(preset, Xfrm::new(area.x + i as f64 * (w + gap), area.y + area.h * 0.25, w, area.h * 0.5), i, g));
+            if let Some(t) = title {
+                let c = s * 0.42;
+                let mut sh = text_shape("roundRect", Xfrm::new(x0 + (s - c) / 2.0, y0 + (s - c * 0.6) / 2.0, c, c * 0.6), &nodes(t), true);
+                paint(d, &mut sh, 0, true);
+                out.push((sh, t.clone()));
             }
         }
+        _ => {}
     }
     out
 }
 
 /// An organisation chart: one box per node, rows by level, each subtree as wide as its leaves.
-fn hierarchy(d: &Diagram, area: Xfrm) -> Vec<Shape> {
+fn hierarchy(d: &Diagram, area: Xfrm) -> Vec<Item> {
     let nodes = &d.nodes[..d.nodes.len().min(MAX_SHAPES)];
     if nodes.is_empty() {
         return vec![];
@@ -375,11 +653,19 @@ fn hierarchy(d: &Diagram, area: Xfrm) -> Vec<Shape> {
             Xfrm::new(cx - bw / 2.0, area.y + depth[i] as f64 * row_h + (row_h - bh) / 2.0, bw, bh)
         })
         .collect();
-    let mut out: Vec<Shape> = nodes.iter().enumerate().map(|(i, n)| text_shape("roundRect", boxes[i], depth[i], &[n])).collect();
+    let mut out: Vec<Item> = nodes
+        .iter()
+        .enumerate()
+        .map(|(i, n)| {
+            let mut sh = text_shape("roundRect", boxes[i], &[n], true);
+            paint(d, &mut sh, depth[i], false);
+            (sh, vec![i])
+        })
+        .collect();
     for i in 0..nodes.len() {
         if let Some(p) = parent[i] {
             let (a, b) = (boxes[p], boxes[i]);
-            out.push(line_shape((a.x + a.w / 2.0, a.y + a.h), (b.x + b.w / 2.0, b.y)));
+            out.push((line_shape((a.x + a.w / 2.0, a.y + a.h), (b.x + b.w / 2.0, b.y)), vec![]));
         }
     }
     out
@@ -457,7 +743,7 @@ fn index(p: &Value, cmd: &str) -> Result<usize> {
 
 /// Insert a new SmartArt graphic (`insert.smartArt`).
 pub fn insert(s: &mut Session, kind: &str, mut nodes: Vec<DiagramNode>) -> Result<Value> {
-    let kind = if KINDS.contains(&kind) { kind } else { "process" };
+    let kind = if is_kind(kind) { kind } else { "process" };
     if nodes.is_empty() {
         nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0 }).collect();
     }
@@ -542,9 +828,33 @@ fn demote(s: &mut Session, p: &Value) -> Result<Value> {
     edit_diagram(s, p, CMD, |d| if demote_node(&mut d.nodes, i) { Ok(Value::Null) } else { Err(bad(CMD, "nothing above to demote under")) })
 }
 
+fn change_style(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.style";
+    let v = str_param(p, "style").filter(|k| STYLES.iter().any(|(id, _)| id == k)).ok_or_else(|| bad(CMD, "unknown style"))?.to_string();
+    edit_diagram(s, p, CMD, |d| {
+        if d.style != v {
+            d.style_xml = None;
+        }
+        d.style = v;
+        Ok(Value::Null)
+    })
+}
+
+fn change_colors(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.colors";
+    let v = str_param(p, "colors").filter(|k| COLORS.iter().any(|(id, _)| id == k)).ok_or_else(|| bad(CMD, "unknown colours"))?.to_string();
+    edit_diagram(s, p, CMD, |d| {
+        if d.colors != v {
+            d.colors_xml = None;
+        }
+        d.colors = v;
+        Ok(Value::Null)
+    })
+}
+
 fn change_layout(s: &mut Session, p: &Value) -> Result<Value> {
     const CMD: &str = "smartArt.layout";
-    let kind = str_param(p, "kind").filter(|k| KINDS.contains(k)).ok_or_else(|| bad(CMD, "unknown layout"))?.to_string();
+    let kind = str_param(p, "kind").filter(|k| is_kind(k)).ok_or_else(|| bad(CMD, "unknown layout"))?.to_string();
     edit_diagram(s, p, CMD, |d| {
         if d.kind != kind {
             // PowerPoint's own layout no longer applies.
@@ -595,7 +905,7 @@ mod tests {
     #[test]
     fn layouts_map_nodes_to_shapes() {
         let area = Xfrm::new(0.0, 0.0, 800.0, 400.0);
-        let d = Diagram { kind: "list".into(), nodes: mk(&[0, 1, 1, 0]), ..Default::default() };
+        let d = Diagram { kind: "blockList".into(), nodes: mk(&[0, 1, 1, 0]), ..Default::default() };
         let v = layout(&d, area);
         assert_eq!(v.len(), 2);
         let t = v[0].text.as_ref().map(|b| b.paragraphs.len());
@@ -608,5 +918,36 @@ mod tests {
             assert!(x.x >= -0.01 && x.x + x.w <= 800.01 && x.y >= -0.01 && x.y + x.h <= 400.01, "{x:?}");
         }
         assert!(layout(&Diagram { kind: "cycle".into(), ..Default::default() }, area).is_empty());
+        // Vertical Bullet List: a bar per top node, its sub-points in a box below.
+        let v = layout_items(&Diagram { kind: "list".into(), nodes: mk(&[0, 1, 1, 0]), ..Default::default() }, area);
+        let maps: Vec<Vec<usize>> = v.into_iter().map(|(_, m)| m).collect();
+        assert_eq!(maps, [vec![0], vec![1, 2], vec![3]]);
+    }
+
+    #[test]
+    fn every_layout_shows_every_node_inside_its_area() {
+        let area = Xfrm::new(50.0, 40.0, 800.0, 400.0);
+        for (kind, _) in LAYOUTS {
+            for style in ["", "subtle", "intense", "outline"] {
+                let d = Diagram {
+                    kind: kind.into(),
+                    nodes: mk(&[0, 1, 0, 0, 1, 0]),
+                    style: style.into(),
+                    colors: "accent2".into(),
+                    ..Default::default()
+                };
+                let items = layout_items(&d, area);
+                let mut shown: Vec<usize> = items.iter().flat_map(|(_, m)| m.clone()).collect();
+                shown.sort_unstable();
+                let want: Vec<usize> = (0..6).collect();
+                assert_eq!(shown, want, "{kind}");
+                for (sh, _) in &items {
+                    let x = sh.xfrm.unwrap_or_default();
+                    let (cx, cy) = (x.x + x.w / 2.0, x.y + x.h / 2.0);
+                    assert!(x.w.is_finite() && x.h.is_finite() && x.w >= 0.0 && x.h >= 0.0, "{kind} {x:?}");
+                    assert!((49.0..=851.0).contains(&cx) && (39.0..=441.0).contains(&cy), "{kind} {x:?}");
+                }
+            }
+        }
     }
 }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 179b6a4f..64b0942c 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -839,7 +839,7 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
 #[test]
 fn smartart_text_pane_edits_regenerate_the_diagram() {
     let mut s = session();
-    let r = s.execute("insert.smartArt", &json!({"kind": "list", "items": ["Plan", "\tScope", "Build"]})).unwrap();
+    let r = s.execute("insert.smartArt", &json!({"kind": "blockList", "items": ["Plan", "\tScope", "Build"]})).unwrap();
     let gid = r["id"].as_u64().unwrap();
     let kids = |s: &Session| match s.doc().unwrap().shape(deckcraft_model::ShapeId(gid as u32)).map(|x| &x.kind) {
         Some(deckcraft_model::ShapeKind::Group { children, .. }) => children.clone(),
@@ -890,6 +890,8 @@ fn smartart_round_trips_through_pptx_as_a_diagram() {
     let mut s = session();
     s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
     s.execute("insert.smartArt", &json!({"kind": "hierarchy", "items": ["CEO", "\tCTO", "\t\tDev", "\tCFO"]})).unwrap();
+    s.execute("smartArt.style", &json!({"style": "intense"})).unwrap();
+    s.execute("smartArt.colors", &json!({"colors": "accent3"})).unwrap();
     let doc = s.doc().unwrap().doc.as_ref().clone();
     let bytes = deckcraft_pptx::export(&doc).unwrap();
     let names: Vec<String> = {
@@ -904,6 +906,7 @@ fn smartart_round_trips_through_pptx_as_a_diagram() {
     let g = back.slides[1].shapes.iter().find(|x| x.diagram.is_some()).expect("a SmartArt group");
     let d = g.diagram.as_ref().unwrap();
     assert_eq!(d.kind, "hierarchy");
+    assert_eq!((d.style.as_str(), d.colors.as_str()), ("intense", "accent3"), "SmartArt style and colours come back");
     assert!(d.imported);
     let outline: Vec<(&str, u8)> = d.nodes.iter().map(|n| (n.text.as_str(), n.level)).collect();
     assert_eq!(outline, [("CEO", 0), ("CTO", 1), ("Dev", 2), ("CFO", 1)]);
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 377f94ef..cfd30ab1 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -329,9 +329,16 @@ pub struct Shape {
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "camelCase")]
 pub struct Diagram {
-    /// list, process, cycle, hierarchy, pyramid or matrix.
+    /// The layout: list, blockList, hBulletList, process, chevron, verticalProcess, stepUp, cycle,
+    /// blockCycle, radial, hierarchy, pyramid, invertedPyramid, matrix or titledMatrix.
     pub kind: String,
     pub nodes: Vec<DiagramNode>,
+    /// SmartArt Style: `flat` (default), `subtle`, `intense` or `outline`.
+    #[serde(skip_serializing_if = "String::is_empty")]
+    pub style: String,
+    /// Change Colors: `colorful` (default: each shape its own accent) or `accent1`…`accent6`.
+    #[serde(skip_serializing_if = "String::is_empty")]
+    pub colors: String,
     /// The group's shapes are the file's drawing, not generated from `nodes`: text typed into them
     /// isn't mapped back to nodes (the first outline edit regenerates them).
     #[serde(skip_serializing_if = "std::ops::Not::not")]
diff --git a/crates/pptx/src/dgm.rs b/crates/pptx/src/dgm.rs
index a3af2702..993c771f 100644
--- a/crates/pptx/src/dgm.rs
+++ b/crates/pptx/src/dgm.rs
@@ -19,48 +19,130 @@ pub const CT_STYLE: &str = "application/vnd.openxmlformats-officedocument.drawin
 pub const CT_COLORS: &str = "application/vnd.openxmlformats-officedocument.drawingml.diagramColors+xml";
 pub const CT_DRAWING: &str = "application/vnd.ms-office.drawingml.diagramDrawing+xml";
 pub const RT_DRAWING: &str = "http://schemas.microsoft.com/office/2007/relationships/diagramDrawing";
-const QS_ID: &str = "urn:microsoft.com/office/officeart/2005/8/quickstyle/simple1";
-const CS_ID: &str = "urn:microsoft.com/office/officeart/2005/8/colors/accent1_2";
+const QS_BASE: &str = "urn:microsoft.com/office/officeart/2005/8/quickstyle/";
+const CS_BASE: &str = "urn:microsoft.com/office/officeart/2005/8/colors/";
+
+/// PowerPoint's quick style for a SmartArt Style.
+pub fn qs_id(style: &str) -> String {
+    let s = match style {
+        "subtle" => "simple3",
+        "intense" => "simple5",
+        "outline" => "simple4",
+        _ => "simple1",
+    };
+    format!("{QS_BASE}{s}")
+}
+
+/// The SmartArt Style closest to a quick style id.
+pub fn style_for(qs: &str) -> &'static str {
+    match qs.rsplit('/').next().unwrap_or("") {
+        "simple1" | "" => "",
+        "simple4" => "outline",
+        "simple2" | "simple3" => "subtle",
+        _ => "intense",
+    }
+}
+
+/// PowerPoint's colour definition for Change Colors.
+pub fn cs_id(colors: &str) -> String {
+    match colors.strip_prefix("accent").and_then(|n| n.parse::<u8>().ok()) {
+        Some(n @ 1..=6) => format!("{CS_BASE}accent{n}_2"),
+        _ => format!("{CS_BASE}colorful1"),
+    }
+}
+
+/// Change Colors from a colour definition id: `accentN_…` keeps accent N, anything else is colourful.
+pub fn colors_for(cs: &str) -> String {
+    let last = cs.rsplit('/').next().unwrap_or("");
+    match last.strip_prefix("accent").and_then(|r| r.split('_').next()).and_then(|n| n.parse::<u8>().ok()) {
+        Some(n @ 1..=6) => format!("accent{n}"),
+        _ => String::new(),
+    }
+}
 /// Most nodes read from one diagram.
 const MAX_NODES: usize = 2000;
 
 /// PowerPoint's built-in layout DeckCraft's layout `kind` is written as.
 pub fn layout_id(kind: &str) -> &'static str {
     match kind {
+        "blockList" => "urn:microsoft.com/office/officeart/2005/8/layout/default",
+        "hBulletList" => "urn:microsoft.com/office/officeart/2005/8/layout/hList1",
         "process" => "urn:microsoft.com/office/officeart/2005/8/layout/process1",
+        "chevron" => "urn:microsoft.com/office/officeart/2005/8/layout/chevron1",
+        "verticalProcess" => "urn:microsoft.com/office/officeart/2005/8/layout/process2",
+        "stepUp" => "urn:microsoft.com/office/officeart/2009/3/layout/StepUpProcess",
         "cycle" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle2",
+        "blockCycle" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle5",
+        "radial" => "urn:microsoft.com/office/officeart/2005/8/layout/radial1",
         "hierarchy" => "urn:microsoft.com/office/officeart/2005/8/layout/hierarchy1",
         "pyramid" => "urn:microsoft.com/office/officeart/2005/8/layout/pyramid1",
+        "invertedPyramid" => "urn:microsoft.com/office/officeart/2005/8/layout/pyramid3",
         "matrix" => "urn:microsoft.com/office/officeart/2005/8/layout/matrix3",
+        "titledMatrix" => "urn:microsoft.com/office/officeart/2005/8/layout/matrix1",
         _ => "urn:microsoft.com/office/officeart/2005/8/layout/vList2",
     }
 }
 
 /// The DeckCraft layout closest to a PowerPoint layout (by its id and category).
 pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
-    let s = format!("{layout_id} {category}").to_ascii_lowercase();
+    let last = layout_id.rsplit('/').next().unwrap_or("").to_ascii_lowercase();
+    // Exact ids first: the layouts DeckCraft writes, and their closest siblings.
+    for k in [
+        "blockList",
+        "hBulletList",
+        "process",
+        "chevron",
+        "verticalProcess",
+        "stepUp",
+        "cycle",
+        "blockCycle",
+        "radial",
+        "hierarchy",
+        "pyramid",
+        "invertedPyramid",
+        "matrix",
+        "titledMatrix",
+        "list",
+    ] {
+        if layout_id == layout_id_of(k) {
+            return k;
+        }
+    }
+    let s = format!("{last} {}", category.to_ascii_lowercase());
     if s.contains("hierarchy") || s.contains("orgchart") {
         "hierarchy"
-    } else if s.contains("cycle") || s.contains("radial") {
+    } else if s.contains("radial") {
+        "radial"
+    } else if s.contains("cycle") {
         "cycle"
     } else if s.contains("pyramid") {
         "pyramid"
     } else if s.contains("matrix") {
         "matrix"
-    } else if s.contains("process") || s.contains("chevron") || s.contains("arrow") {
+    } else if s.contains("chevron") {
+        "chevron"
+    } else if s.contains("process") || s.contains("arrow") {
         "process"
+    } else if last == "default" {
+        "blockList"
+    } else if last.starts_with("hlist") {
+        "hBulletList"
     } else {
         "list"
     }
 }
 
+fn layout_id_of(kind: &str) -> &'static str {
+    layout_id(kind)
+}
+
 fn category(kind: &str) -> &'static str {
     match kind {
-        "process" => "process",
-        "cycle" => "cycle",
+        "process" | "chevron" | "verticalProcess" | "stepUp" => "process",
+        "cycle" | "blockCycle" | "radial" => "cycle",
         "hierarchy" => "hierarchy",
-        "pyramid" => "pyramid",
-        "matrix" => "matrix",
+        "pyramid" | "invertedPyramid" => "pyramid",
+        "matrix" | "titledMatrix" => "matrix",
         _ => "list",
     }
 }
@@ -101,10 +183,10 @@ pub fn data_xml(d: &Diagram, seed: u32, drawing_rel: &str) -> Vec<u8> {
         A::new()
             .a("loTypeId", &lo)
             .a("loCatId", category(&d.kind))
-            .a("qsTypeId", QS_ID)
+            .a("qsTypeId", qs_id(&d.style))
             .a("qsCatId", "simple")
-            .a("csTypeId", CS_ID)
-            .a("csCatId", "accent1")
+            .a("csTypeId", cs_id(&d.colors))
+            .a("csCatId", if d.colors.starts_with("accent") { d.colors.as_str() } else { "colorful" })
             .a("phldr", "1"),
     );
     w.empty0("dgm:spPr");
@@ -230,10 +312,20 @@ fn paragraphs(t: &El) -> String {
 /// The layout algorithm and node shape of a DeckCraft layout.
 fn alg(kind: &str) -> (&'static str, Vec<(&'static str, &'static str)>, &'static str) {
     match kind {
-        "process" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "roundRect"),
-        "cycle" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse"),
-        "pyramid" => ("pyra", vec![("linDir", "fromT"), ("txDir", "fromT"), ("pyraAcctPos", "bef")], "trapezoid"),
-        "matrix" => ("snake", vec![("grDir", "tL"), ("flowDir", "row"), ("contDir", "sameDir"), ("off", "ctr")], "roundRect"),
+        "process" | "stepUp" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "roundRect"),
+        "chevron" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "chevron"),
+        "verticalProcess" => ("lin", vec![("linDir", "fromT"), ("nodeHorzAlign", "ctr")], "roundRect"),
+        "cycle" | "radial" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse"),
+        "blockCycle" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "roundRect"),
+        "pyramid" | "invertedPyramid" => {
+            ("pyra", vec![("linDir", if kind == "pyramid" { "fromT" } else { "fromB" }), ("txDir", "fromT"), ("pyraAcctPos", "bef")], "trapezoid")
+        }
+        "matrix" | "titledMatrix" | "blockList" => (
+            "snake",
+            vec![("grDir", "tL"), ("flowDir", "row"), ("contDir", "sameDir"), ("off", "ctr")],
+            if kind == "blockList" { "rect" } else { "roundRect" },
+        ),
+        "hBulletList" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "t")], "roundRect"),
         _ => ("lin", vec![("linDir", "fromT"), ("vertAlign", "mid")], "roundRect"),
     }
 }
@@ -348,7 +440,7 @@ pub fn layout_xml(kind: &str) -> Vec<u8> {
         w.empty0("dgm:ruleLst");
         w.open("dgm:forEach", A::new().a("name", "nodes").a("axis", "ch").a("ptType", "node"));
         node_layout(&mut w, shape, true);
-        if kind != "cycle" {
+        if !matches!(kind, "cycle" | "blockCycle" | "radial") {
             space(&mut w);
         }
         w.close("dgm:forEach");
@@ -359,9 +451,9 @@ pub fn layout_xml(kind: &str) -> Vec<u8> {
 }
 
 /// `ppt/diagrams/quickStyleN.xml`: flat shapes drawn from the theme's first styles.
-pub fn style_xml() -> Vec<u8> {
+pub fn style_xml(style: &str) -> Vec<u8> {
     let mut w = W::new();
-    w.open("dgm:styleDef", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("uniqueId", QS_ID));
+    w.open("dgm:styleDef", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("uniqueId", qs_id(style)));
     w.empty("dgm:title", A::new().a("val", ""));
     w.empty("dgm:desc", A::new().a("val", ""));
     w.open0("dgm:catLst");
@@ -394,20 +486,30 @@ pub fn style_xml() -> Vec<u8> {
 }
 
 /// `ppt/diagrams/colorsN.xml`: accent 1 fills with light text.
-pub fn colors_xml() -> Vec<u8> {
+pub fn colors_xml(colors: &str) -> Vec<u8> {
     let mut w = W::new();
-    w.open("dgm:colorsDef", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("uniqueId", CS_ID));
+    w.open("dgm:colorsDef", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("uniqueId", cs_id(colors)));
     w.empty("dgm:title", A::new().a("val", ""));
     w.empty("dgm:desc", A::new().a("val", ""));
+    let single = colors.starts_with("accent");
     w.open0("dgm:catLst");
-    w.empty("dgm:cat", A::new().a("type", "accent1").a("pri", "11200"));
+    w.empty("dgm:cat", A::new().a("type", if single { colors } else { "colorful" }).a("pri", "11200"));
     w.close("dgm:catLst");
     w.open("dgm:styleLbl", A::new().a("name", "node1"));
-    for (tag, clr) in [("dgm:fillClrLst", "accent1"), ("dgm:linClrLst", "lt1")] {
-        w.open(tag, A::new().a("meth", "repeat"));
-        w.empty("a:schemeClr", A::new().a("val", clr));
-        w.close(tag);
+    if single {
+        w.open("dgm:fillClrLst", A::new().a("meth", "repeat"));
+        w.empty("a:schemeClr", A::new().a("val", colors));
+        w.close("dgm:fillClrLst");
+    } else {
+        w.open("dgm:fillClrLst", A::new().a("meth", "repeat"));
+        for k in 1..=6 {
+            w.empty("a:schemeClr", A::new().a("val", format!("accent{k}")));
+        }
+        w.close("dgm:fillClrLst");
     }
+    w.open("dgm:linClrLst", A::new().a("meth", "repeat"));
+    w.empty("a:schemeClr", A::new().a("val", "lt1"));
+    w.close("dgm:linClrLst");
     w.empty0("dgm:effectClrLst");
     w.empty0("dgm:txLinClrLst");
     w.empty0("dgm:txFillClrLst");
@@ -434,7 +536,7 @@ mod tests {
         assert_eq!(outline(&doc.root), d.nodes);
         let s = String::from_utf8(xml).unwrap();
         assert!(s.contains("hierarchy1") && s.contains("relId=\"rId9\""));
-        for x in [layout_xml("hierarchy"), layout_xml("cycle"), style_xml(), colors_xml()] {
+        for x in [layout_xml("hierarchy"), layout_xml("cycle"), style_xml("subtle"), colors_xml(""), colors_xml("accent3")] {
             assert!(crate::xml::parse(&x).is_ok());
         }
     }
@@ -445,7 +547,11 @@ mod tests {
         let doc = crate::xml::parse(xml).unwrap();
         assert_eq!(outline(&doc.root), nodes(&[("A", 0), ("", 1)]));
         assert_eq!(kind_for("urn:microsoft.com/office/officeart/2005/8/layout/orgChart1", ""), "hierarchy");
-        assert_eq!(kind_for("urn:x/layout/chevron2", "process"), "process");
-        assert_eq!(kind_for("urn:x/layout/default", "list"), "list");
+        assert_eq!(kind_for("urn:x/layout/chevron2", "process"), "chevron");
+        assert_eq!(kind_for("urn:x/layout/hProcess9", "process"), "process");
+        assert_eq!(kind_for("urn:x/layout/default", "list"), "blockList");
+        assert_eq!(colors_for(&cs_id("accent4")), "accent4");
+        assert_eq!(colors_for(&cs_id("")), "");
+        assert_eq!(style_for(&qs_id("outline")), "outline");
     }
 }
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index c33dcc03..34d7bbc1 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -464,9 +464,14 @@ fn diagram_outline(imp: &Imp, part: &Part, rel_ids: &El, data: &El) -> Option<de
         .and_then(|p| p.attr("loTypeId"))
         .unwrap_or("");
     let id = if layout_id.is_empty() { lo_type.to_string() } else { layout_id };
+    let pr = data.path(&["ptLst"]).and_then(|l| l.children_named("pt").find(|p| p.attr("type") == Some("doc"))).and_then(|p| p.child("prSet"));
+    let style = crate::dgm::style_for(pr.and_then(|p| p.attr("qsTypeId")).unwrap_or("")).to_string();
+    let colors = crate::dgm::colors_for(pr.and_then(|p| p.attr("csTypeId")).unwrap_or(""));
     Some(deckcraft_model::Diagram {
         kind: crate::dgm::kind_for(&id, &cat).to_string(),
         nodes,
+        style,
+        colors,
         imported: true,
         layout_id: id,
         layout_xml,
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index bb3b63ac..26cb67de 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -477,10 +477,10 @@ fn diagram(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, d: &dec
     x.pkg.xml_part(&layout, dgm::CT_LAYOUT, lo_xml);
     let lo = rel(o, "diagramLayout", &layout);
     let style = name("quickStyle");
-    x.pkg.xml_part(&style, dgm::CT_STYLE, d.style_xml.clone().map(String::into_bytes).unwrap_or_else(dgm::style_xml));
+    x.pkg.xml_part(&style, dgm::CT_STYLE, d.style_xml.clone().map(String::into_bytes).unwrap_or_else(|| dgm::style_xml(&d.style)));
     let qs = rel(o, "diagramQuickStyle", &style);
     let colors = name("colors");
-    x.pkg.xml_part(&colors, dgm::CT_COLORS, d.colors_xml.clone().map(String::into_bytes).unwrap_or_else(dgm::colors_xml));
+    x.pkg.xml_part(&colors, dgm::CT_COLORS, d.colors_xml.clone().map(String::into_bytes).unwrap_or_else(|| dgm::colors_xml(&d.colors)));
     let cs = rel(o, "diagramColors", &colors);
     let mut fs = s.clone();
     fs.xfrm = Some(frame);
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index c4c31c81..f1ca7499 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2326,9 +2326,9 @@ fn chart_design(app: &mut SlideApp, ui: &mut Ui) {
 fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
     let sel = app.session.active().and_then(deckcraft_engine::cmd::smartart::selected);
     let row = app.ui.smartart_row;
-    let (gid, n, kind) = match &sel {
-        Some((id, d)) => (Some(id.0), d.nodes.len(), d.kind.clone()),
-        None => (None, 0, String::new()),
+    let (gid, n, kind, style, colors) = match &sel {
+        Some((id, d)) => (Some(id.0), d.nodes.len(), d.kind.clone(), d.style.clone(), d.colors.clone()),
+        None => (None, 0, String::new(), String::new(), String::new()),
     };
     let at = row.min(n.saturating_sub(1));
     group(ui, |ui| {
@@ -2356,16 +2356,35 @@ fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
         });
     });
     group(ui, |ui| {
-        let (r, _) = small_button_ex(ui, Icon::Layout, "Layout", gid.is_some(), false, true);
+        let (r, _) = small_button_ex(ui, Icon::Layout, "Layouts", gid.is_some(), false, true);
         egui::Popup::menu(&r).show(|ui| {
-            for k in deckcraft_engine::cmd::smartart::KINDS {
-                let label = format!("{}{}", k[..1].to_uppercase(), &k[1..]);
+            for (k, label) in deckcraft_engine::cmd::smartart::LAYOUTS {
                 if ui.selectable_label(kind == k, label).clicked() {
                     run(app, "smartArt.layout", json!({"id": gid, "kind": k}));
                 }
             }
         });
     });
+    group(ui, |ui| {
+        let (r, _) = small_button_ex(ui, Icon::ChangeChartType, "Change Colors", gid.is_some(), false, true);
+        egui::Popup::menu(&r).show(|ui| {
+            for (k, label) in deckcraft_engine::cmd::smartart::COLORS {
+                let on = colors == k || (colors.is_empty() && k == "colorful");
+                if ui.selectable_label(on, label).clicked() {
+                    run(app, "smartArt.colors", json!({"id": gid, "colors": k}));
+                }
+            }
+        });
+        let (r, _) = small_button_ex(ui, Icon::SmartArt, "SmartArt Styles", gid.is_some(), false, true);
+        egui::Popup::menu(&r).show(|ui| {
+            for (k, label) in deckcraft_engine::cmd::smartart::STYLES {
+                let on = style == k || (style.is_empty() && k == "flat");
+                if ui.selectable_label(on, label).clicked() {
+                    run(app, "smartArt.style", json!({"id": gid, "style": k}));
+                }
+            }
+        });
+    });
     arrange_group(app, ui);
 }
 
diff --git a/docs/gaps.md b/docs/gaps.md
index 3c7d5b31..28fd297a 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -155,8 +155,10 @@ Detail in [file-format-parity.md](file-format-parity.md).
   Shape, Promote, Demote, Remove and layout switching (`crates/engine/src/cmd/smartart.rs`). On
   `.pptx` the outline is written as a real diagram (data, layout, quick style, colours and the
   cached drawing; `crates/pptx/src/dgm.rs`), and PowerPoint diagrams read their outline from the
-  data model, so they get the Text Pane too. Still missing: DeckCraft's own layout definitions are
-  simple (not yet checked in PowerPoint itself); there are six layouts rather than ~200; editing an
+  data model, so they get the Text Pane too. 15 layouts (bullet and block lists, five process, two cycle and
+  a radial, hierarchy, two pyramids, two matrices), four SmartArt Styles and Change Colors
+  (colourful or one accent). Still missing: DeckCraft's own layout definitions are simple (not yet
+  checked in PowerPoint itself); PowerPoint has ~200 layouts, picture layouts and 3-D styles; editing an
   imported diagram's outline redraws it with DeckCraft's layout; a diagram with no cached drawing
   isn't drawn.
 - **Impact:** a PowerPoint diagram edited in DeckCraft changes look.

From f894bb1d172f6165ba6061cb8df1b35a6c97fcab Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:47:15 +0300
Subject: [PATCH 224/376] SmartArt: keep pyramid text inside its band

Inset each pyramid band's text past the band's mid width so bullets no longer hang over the sloped sides; capped so the tip band still has room.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/smartart.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index 331dabec..c4905a2b 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -563,6 +563,12 @@ fn layout_items(d: &Diagram, area: Xfrm) -> Vec<Item> {
                 sh.geom = Geom::Custom {
                     paths: vec![deckcraft_model::CustomPath { w, h: bh, d: path, fill: deckcraft_geom::preset::FillMode::Norm, stroke: true }],
                 };
+                // Keep the text inside the sloped sides: inset it to a bit past the band's mid width.
+                let inset = ((it + ib) / 2.0 + (it - ib).abs() / 4.0 + 4.0).min(w * 0.2);
+                if let Some(b) = &mut sh.text {
+                    b.body.inset_l = Some(inset);
+                    b.body.inset_r = Some(inset);
+                }
                 paint(d, &mut sh, i, false);
                 out.push((sh, g.clone()));
             }

From ec1f25e6177a1ff7406ec0db7789de8016abcb1f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:52:53 +0300
Subject: [PATCH 225/376] Review: spelling with Hunspell dictionaries,
 suggestions, Change and Ignore All

---
 crates/engine/src/cmd/review.rs      | 220 +++++++++--
 crates/engine/src/lib.rs             |   1 +
 crates/engine/src/spell.rs           | 566 +++++++++++++++++++++++++++
 crates/engine/src/tests.rs           |  36 ++
 crates/ui-egui/src/dialogs.rs        |  76 +++-
 crates/ui-egui/src/spelling_tests.rs |  46 +++
 docs/gaps.md                         |  11 +-
 7 files changed, 910 insertions(+), 46 deletions(-)
 create mode 100644 crates/engine/src/spell.rs
 create mode 100644 crates/ui-egui/src/spelling_tests.rs

diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 8e3a532c..822d6e92 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -16,7 +16,17 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("comment.resolve", "Resolve Thread", ["Comments"], None, "{index, resolved?: bool}", has_slide, resolve),
         cmd!(query "comment.list", "Comments", [], None, "{slide?} → comments", has_slide, list),
         cmd!(query "review.accessibility", "Check Accessibility", ["Review", "Accessibility"], None, "{} → [{slide, shape, issue}]", has_doc, accessibility),
-        cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{} → [{slide, shape, word}] (words not in the built-in list)", has_doc, spelling),
+        cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{lang?, ignore?:[word]} → [{slide, shape, word, lang, suggestions}] (Hunspell dictionaries installed on the system, else a built-in list of common misspellings)", has_doc, spelling),
+        cmd!(
+            "review.spellingChange",
+            "Change Spelling",
+            ["Review", "Proofing"],
+            None,
+            "{shape, word, to, all?} → {changed} (replace the whole word in that shape's text, or in every shape with all)",
+            has_doc,
+            spelling_change
+        ),
+        cmd!(query "review.dictionary", "Spelling Dictionary", ["Review", "Proofing"], None, "{lang?} → {lang, available, found, folders} (whether review.spelling has a dictionary, and which file)", always, dictionary_info),
         cmd!(noundo "show.fromStart", "Play from Start", ["Slide Show", "Start Slide Show"], Some("Cmd+Shift+Enter"), "{}", has_slide, |s, _| start(s, 0)),
         cmd!(noundo "show.fromCurrent", "Play from Current Slide", ["Slide Show", "Start Slide Show"], Some("Cmd+Enter"), "{}", has_slide, |s, _| {
             let i = s.doc()?.selection.slide;
@@ -168,45 +178,85 @@ fn accessibility(s: &mut Session, _p: &Value) -> Result<Value> {
     Ok(Value::Array(out))
 }
 
-fn spelling(s: &mut Session, _p: &Value) -> Result<Value> {
-    // A small built-in list of frequent misspellings (full dictionaries come later).
-    const COMMON: &[&str] = &[
-        "teh",
-        "recieve",
-        "seperate",
-        "occured",
-        "untill",
-        "wich",
-        "becuase",
-        "definately",
-        "thier",
-        "alot",
-        "accomodate",
-        "acheive",
-        "adress",
-        "begining",
-        "beleive",
-        "calender",
-        "commited",
-        "enviroment",
-        "goverment",
-        "independant",
-        "neccessary",
-        "occassion",
-        "publically",
-        "reccomend",
-        "tommorow",
-        "wierd",
-    ];
+/// Frequent misspellings, used when no dictionary for the language is installed.
+const COMMON: &[&str] = &[
+    "teh",
+    "recieve",
+    "seperate",
+    "occured",
+    "untill",
+    "wich",
+    "becuase",
+    "definately",
+    "thier",
+    "alot",
+    "accomodate",
+    "acheive",
+    "adress",
+    "begining",
+    "beleive",
+    "calender",
+    "commited",
+    "enviroment",
+    "goverment",
+    "independant",
+    "neccessary",
+    "occassion",
+    "publically",
+    "reccomend",
+    "tommorow",
+    "wierd",
+];
+
+/// The language a check uses: the `lang` parameter, else the first run that says, else US English.
+fn check_lang(doc: &deckcraft_model::Presentation, p: &Value) -> String {
+    if let Some(l) = str_param(p, "lang") {
+        return l.to_string();
+    }
+    let mut found = None;
+    for sl in &doc.slides {
+        deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
+            if found.is_none()
+                && let Some(t) = &sh.text
+            {
+                found = t.paragraphs.iter().flat_map(|p| &p.runs).find_map(|r| r.props.lang.clone());
+            }
+        });
+    }
+    found.unwrap_or_else(|| "en-US".into())
+}
+
+/// The words of `text`: letters, digits, apostrophes inside a word and the dictionary's extras.
+fn words<'a>(text: &'a str, extra: &[char]) -> Vec<&'a str> {
+    text.split(|c: char| !(c.is_alphanumeric() || c == '\'' || c == '’' || extra.contains(&c)))
+        .map(|w| w.trim_matches(|c| c == '\'' || c == '’'))
+        .filter(|w| !w.is_empty() && w.chars().any(char::is_alphabetic) && !w.chars().any(|c| c.is_ascii_digit()))
+        .collect()
+}
+
+fn spelling(s: &mut Session, p: &Value) -> Result<Value> {
     let st = s.doc()?;
+    let lang = check_lang(&st.doc, p);
+    let ignore: Vec<String> =
+        p.get("ignore").and_then(Value::as_array).map(|a| a.iter().filter_map(Value::as_str).map(str::to_lowercase).collect()).unwrap_or_default();
+    let dict = crate::spell::dictionary(&lang);
+    let extra: Vec<char> = dict.as_ref().map(|d| d.word_chars().to_vec()).unwrap_or_default();
     let mut out = vec![];
     for (i, sl) in st.doc.slides.iter().enumerate() {
         deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
-            if let Some(t) = &sh.text {
-                for w in t.text().split(|c: char| !c.is_alphanumeric() && c != '\'') {
-                    if COMMON.contains(&w.to_lowercase().as_str()) {
-                        out.push(json!({"slide": i, "shape": sh.id, "word": w}));
-                    }
+            let Some(t) = &sh.text else { return };
+            let text = t.text();
+            for w in words(&text, &extra) {
+                if ignore.contains(&w.to_lowercase()) {
+                    continue;
+                }
+                let bad = match &dict {
+                    Some(d) => !d.check(w),
+                    None => COMMON.contains(&w.to_lowercase().as_str()),
+                };
+                if bad {
+                    let sug = dict.as_ref().map(|d| d.suggest(w, 5)).unwrap_or_default();
+                    out.push(json!({"slide": i, "shape": sh.id, "word": w, "lang": lang, "suggestions": sug}));
                 }
             }
         });
@@ -214,6 +264,104 @@ fn spelling(s: &mut Session, _p: &Value) -> Result<Value> {
     Ok(Value::Array(out))
 }
 
+/// Replace whole-word `from` with `to` in `text`; how many were replaced.
+fn replace_word(text: &mut String, from: &str, to: &str, all: bool) -> usize {
+    let is_word = |c: char| c.is_alphanumeric() || c == '\'' || c == '’';
+    let mut n = 0;
+    let mut at = 0;
+    while let Some(i) = text.get(at..).and_then(|t| t.find(from)).map(|i| i + at) {
+        let end = i + from.len();
+        let before = text.get(..i).and_then(|t| t.chars().next_back()).is_some_and(is_word);
+        let after = text.get(end..).and_then(|t| t.chars().next()).is_some_and(is_word);
+        if before || after {
+            at = end;
+            continue;
+        }
+        text.replace_range(i..end, to);
+        n += 1;
+        at = i + to.len();
+        if !all {
+            break;
+        }
+    }
+    n
+}
+
+fn spelling_change(s: &mut Session, p: &Value) -> Result<Value> {
+    let word = str_param(p, "word").filter(|w| !w.is_empty()).ok_or_else(|| bad("review.spellingChange", "missing `word`"))?.to_string();
+    let to = str_param(p, "to").ok_or_else(|| bad("review.spellingChange", "missing `to`"))?.to_string();
+    let all = bool_or(p, "all", false);
+    let shape = p.get("shape").and_then(Value::as_u64);
+    if shape.is_none() && !all {
+        return Err(bad("review.spellingChange", "give `shape`, or `all: true`"));
+    }
+    // Nothing to change makes no undo step.
+    let mut any = false;
+    let st = s.doc()?;
+    for sl in &st.doc.slides {
+        deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
+            if shape.is_none_or(|id| serde_json::to_value(sh.id).ok().and_then(|v| v.as_u64()) == Some(id))
+                && let Some(t) = &sh.text
+            {
+                any |= t.paragraphs.iter().flat_map(|p| &p.runs).any(|r| replace_word(&mut r.text.clone(), &word, &to, false) > 0);
+            }
+        });
+    }
+    if !any {
+        return Ok(json!({"changed": 0}));
+    }
+    let changed = s.edit(|doc, _| {
+        let mut n = 0;
+        let id_of = |sh: &deckcraft_model::Shape| serde_json::to_value(sh.id).ok().and_then(|v| v.as_u64());
+        for sl in &mut doc.slides {
+            let mut hit = false;
+            deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
+                hit |= shape.is_none_or(|id| id_of(sh) == Some(id)) && sh.text.as_ref().is_some_and(|t| t.text().contains(word.as_str()));
+            });
+            if !hit || (!all && n > 0) {
+                continue;
+            }
+            walk_text_mut(&mut Arc::make_mut(sl).shapes, 0, &mut |sh| {
+                if shape.is_some_and(|id| id_of(sh) != Some(id)) || (!all && n > 0) {
+                    return;
+                }
+                let Some(t) = sh.text.as_mut() else { return };
+                for r in t.paragraphs.iter_mut().flat_map(|p| p.runs.iter_mut()) {
+                    if !all && n > 0 {
+                        break;
+                    }
+                    n += replace_word(&mut r.text, &word, &to, all);
+                }
+            });
+        }
+        Ok(n)
+    })?;
+    Ok(json!({"changed": changed}))
+}
+
+fn walk_text_mut(shapes: &mut [deckcraft_model::Shape], depth: usize, f: &mut dyn FnMut(&mut deckcraft_model::Shape)) {
+    if depth > 64 {
+        return;
+    }
+    for sh in shapes.iter_mut() {
+        f(sh);
+        if let deckcraft_model::ShapeKind::Group { children, .. } = &mut sh.kind {
+            walk_text_mut(children, depth + 1, f);
+        }
+    }
+}
+
+fn dictionary_info(s: &mut Session, p: &Value) -> Result<Value> {
+    let lang = match s.doc() {
+        Ok(st) => check_lang(&st.doc, p),
+        Err(_) => str_param(p, "lang").unwrap_or("en-US").to_string(),
+    };
+    let dirs = crate::spell::search_dirs();
+    let found = crate::spell::find_in(&dirs, &lang).map(|(a, _)| a.with_extension("").display().to_string());
+    let available = crate::spell::dictionary(&lang).is_some();
+    Ok(json!({"lang": lang, "available": available, "found": found, "folders": dirs.iter().map(|d| d.display().to_string()).collect::<Vec<_>>()}))
+}
+
 fn start(s: &mut Session, from: usize) -> Result<Value> {
     s.ui_requests.push(UiRequest::StartShow { from });
     Ok(json!({"from": from}))
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..916d55ec 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -15,6 +15,7 @@ pub mod keys;
 pub mod links;
 pub mod recovery;
 pub mod sample;
+pub mod spell;
 pub mod tools;
 
 use std::sync::Arc;
diff --git a/crates/engine/src/spell.rs b/crates/engine/src/spell.rs
new file mode 100644
index 00000000..4c089812
--- /dev/null
+++ b/crates/engine/src/spell.rs
@@ -0,0 +1,566 @@
+//! Spell checking with Hunspell-format dictionaries (`xx_YY.aff` + `xx_YY.dic`).
+//!
+//! A subset of Hunspell: `SET` (UTF-8 and ISO-8859-1), `FLAG` (default, `long`, `num`, `UTF-8`),
+//! `PFX`/`SFX` with strip, conditions and cross products, continuation flags on affixes (one
+//! level: a suffix that allows a further suffix), `NEEDAFFIX`, `FORBIDDENWORD`, `NOSUGGEST`,
+//! `KEEPCASE`, `TRY`, `REP` and `WORDCHARS`. Compounding, `ICONV`/`OCONV` and morphology are not
+//! read; words they would accept are reported as misspelt.
+//!
+//! No dictionary ships with DeckCraft. They are looked up in the folders the system's own spell
+//! checkers use (and `DECKCRAFT_DICTIONARIES`), so whatever the user installed is used.
+
+use std::collections::{HashMap, HashSet};
+use std::path::{Path, PathBuf};
+use std::sync::{Arc, Mutex, OnceLock};
+
+type Flag = u32;
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+enum FlagMode {
+    Char,
+    Long,
+    Num,
+}
+
+#[derive(Clone, Debug)]
+enum Cond {
+    Any,
+    Is(char),
+    In(Vec<char>, bool),
+}
+
+impl Cond {
+    fn matches(&self, c: char) -> bool {
+        match self {
+            Cond::Any => true,
+            Cond::Is(x) => *x == c,
+            Cond::In(set, neg) => set.contains(&c) != *neg,
+        }
+    }
+}
+
+fn parse_cond(s: &str) -> Vec<Cond> {
+    let mut out = vec![];
+    let mut it = s.chars();
+    while let Some(c) = it.next() {
+        match c {
+            '.' => out.push(Cond::Any),
+            '[' => {
+                let mut set = vec![];
+                let mut neg = false;
+                for (i, d) in it.by_ref().enumerate() {
+                    if d == ']' {
+                        break;
+                    }
+                    if i == 0 && d == '^' {
+                        neg = true;
+                    } else {
+                        set.push(d);
+                    }
+                }
+                out.push(Cond::In(set, neg));
+            }
+            c => out.push(Cond::Is(c)),
+        }
+    }
+    out
+}
+
+#[derive(Clone, Debug)]
+struct Affix {
+    flag: Flag,
+    cross: bool,
+    strip: String,
+    add: String,
+    cond: Vec<Cond>,
+    cont: Vec<Flag>,
+}
+
+impl Affix {
+    /// Prefix: does `root` start with the condition? Suffix: does it end with it?
+    fn cond_ok(&self, root: &[char], prefix: bool) -> bool {
+        if self.cond.len() > root.len() {
+            return false;
+        }
+        if prefix {
+            self.cond.iter().zip(root).all(|(c, r)| c.matches(*r))
+        } else {
+            self.cond.iter().rev().zip(root.iter().rev()).all(|(c, r)| c.matches(*r))
+        }
+    }
+}
+
+/// A loaded dictionary.
+#[derive(Debug, Default)]
+pub struct Dictionary {
+    words: HashMap<String, Vec<Vec<Flag>>>,
+    pfx: Vec<Affix>,
+    sfx: Vec<Affix>,
+    try_chars: Vec<char>,
+    rep: Vec<(String, String)>,
+    word_chars: Vec<char>,
+    forbidden: Option<Flag>,
+    need_affix: Option<Flag>,
+    no_suggest: Option<Flag>,
+    keep_case: Option<Flag>,
+}
+
+fn decode(bytes: &[u8], latin1: bool) -> String {
+    if latin1 { bytes.iter().map(|b| char::from(*b)).collect() } else { String::from_utf8_lossy(bytes).into_owned() }
+}
+
+fn parse_flags(s: &str, mode: FlagMode) -> Vec<Flag> {
+    match mode {
+        FlagMode::Char => s.chars().map(|c| c as u32).collect(),
+        FlagMode::Long => {
+            let c: Vec<char> = s.chars().collect();
+            c.chunks(2).map(|p| p.iter().fold(0u32, |a, c| a.wrapping_mul(0x11_0000).wrapping_add(*c as u32))).collect()
+        }
+        FlagMode::Num => s.split(',').filter_map(|n| n.trim().parse().ok()).collect(),
+    }
+}
+
+fn one_flag(s: Option<&str>, mode: FlagMode) -> Option<Flag> {
+    s.and_then(|s| parse_flags(s, mode).first().copied())
+}
+
+impl Dictionary {
+    /// Parse a dictionary from the bytes of its `.aff` and `.dic` files.
+    pub fn parse(aff: &[u8], dic: &[u8]) -> Dictionary {
+        let head = String::from_utf8_lossy(aff);
+        let latin1 = head.lines().any(|l| {
+            let mut w = l.split_whitespace();
+            w.next() == Some("SET") && w.next().is_some_and(|e| e.to_ascii_uppercase().replace('-', "").starts_with("ISO8859"))
+        });
+        let aff = decode(aff, latin1);
+        let mode = aff
+            .lines()
+            .find_map(|l| {
+                let mut w = l.split_whitespace();
+                (w.next() == Some("FLAG")).then(|| match w.next() {
+                    Some("long") => FlagMode::Long,
+                    Some("num") => FlagMode::Num,
+                    _ => FlagMode::Char,
+                })
+            })
+            .unwrap_or(FlagMode::Char);
+        let mut d = Dictionary::default();
+        let mut lines = aff.lines().map(|l| l.split('#').next().unwrap_or("")).peekable();
+        while let Some(l) = lines.next() {
+            let w: Vec<&str> = l.split_whitespace().collect();
+            match w.as_slice() {
+                ["TRY", s, ..] => d.try_chars = s.chars().collect(),
+                ["WORDCHARS", s, ..] => d.word_chars = s.chars().collect(),
+                ["FORBIDDENWORD", f, ..] => d.forbidden = one_flag(Some(f), mode),
+                ["NEEDAFFIX", f, ..] | ["PSEUDOROOT", f, ..] => d.need_affix = one_flag(Some(f), mode),
+                ["NOSUGGEST", f, ..] => d.no_suggest = one_flag(Some(f), mode),
+                ["KEEPCASE", f, ..] => d.keep_case = one_flag(Some(f), mode),
+                ["REP", n] => {
+                    for _ in 0..n.parse::<usize>().unwrap_or(0) {
+                        let r: Vec<&str> = lines.next().unwrap_or("").split_whitespace().collect();
+                        if let [_, a, b, ..] = r.as_slice() {
+                            d.rep.push((a.replace('_', " "), b.replace('_', " ")));
+                        }
+                    }
+                }
+                [kind @ ("PFX" | "SFX"), flag, cross, n] if n.parse::<usize>().is_ok() => {
+                    let prefix = *kind == "PFX";
+                    let Some(flag) = one_flag(Some(flag), mode) else { continue };
+                    let cross = cross.eq_ignore_ascii_case("y");
+                    for _ in 0..n.parse::<usize>().unwrap_or(0) {
+                        let r: Vec<&str> = lines.next().unwrap_or("").split_whitespace().collect();
+                        let [_, _, strip, add, rest @ ..] = r.as_slice() else { continue };
+                        let (add, cont) = match add.split_once('/') {
+                            Some((a, c)) => (a, parse_flags(c, mode)),
+                            None => (*add, vec![]),
+                        };
+                        let a = Affix {
+                            flag,
+                            cross,
+                            strip: if *strip == "0" { String::new() } else { strip.to_string() },
+                            add: if add == "0" { String::new() } else { add.to_string() },
+                            cond: parse_cond(rest.first().copied().unwrap_or(".")),
+                            cont,
+                        };
+                        if prefix { d.pfx.push(a) } else { d.sfx.push(a) }
+                    }
+                }
+                _ => {}
+            }
+        }
+        let dic = decode(dic, latin1);
+        for (i, l) in dic.lines().enumerate() {
+            if i == 0 && l.trim().parse::<usize>().is_ok() {
+                continue;
+            }
+            let entry = l.split(['\t']).next().unwrap_or("").trim_end();
+            // Morphological fields follow a space (`word/flags po:noun`).
+            let entry = entry.split(' ').next().unwrap_or("");
+            if entry.is_empty() {
+                continue;
+            }
+            let (word, flags) = match entry.split_once('/') {
+                Some((w, f)) if !w.is_empty() => (w, parse_flags(f, mode)),
+                _ => (entry, vec![]),
+            };
+            d.words.entry(word.to_string()).or_default().push(flags);
+        }
+        d
+    }
+
+    /// Add `word` (no flags), as a user's own dictionary entry.
+    pub fn add_word(&mut self, word: &str) {
+        self.words.entry(word.to_string()).or_default().push(vec![]);
+    }
+
+    fn has(&self, flags: &[Flag], f: Option<Flag>) -> bool {
+        f.is_some_and(|f| flags.contains(&f))
+    }
+
+    /// `word` as a root carrying all of `need` (and not forbidden).
+    fn root(&self, word: &str, need: &[Flag], affixed: bool) -> bool {
+        self.words.get(word).is_some_and(|hs| {
+            hs.iter().any(|f| !self.has(f, self.forbidden) && (affixed || !self.has(f, self.need_affix)) && need.iter().all(|n| f.contains(n)))
+        })
+    }
+
+    fn forbidden_word(&self, word: &str) -> bool {
+        self.words.get(word).is_some_and(|hs| hs.iter().any(|f| self.has(f, self.forbidden)))
+    }
+
+    /// Strip suffixes from `w` (one, or two through continuation flags); `extra` flags must also be
+    /// on the root, `cross` means the suffix must allow a prefix.
+    fn suffixed(&self, w: &[char], extra: &[Flag], cross: bool) -> bool {
+        for s in &self.sfx {
+            if cross && !s.cross {
+                continue;
+            }
+            let Some(stem) = strip_end(w, &s.add, &s.strip) else { continue };
+            if !s.cond_ok(&stem, false) {
+                continue;
+            }
+            let root: String = stem.iter().collect();
+            let mut need = extra.to_vec();
+            need.push(s.flag);
+            if self.root(&root, &need, true) {
+                return true;
+            }
+            // A second suffix whose continuation allows this one (`walk/A` + `ing/B`…).
+            for s2 in &self.sfx {
+                if !s.cont.is_empty() || !s2.cont.contains(&s.flag) {
+                    continue;
+                }
+                let Some(stem2) = strip_end(&stem, &s2.add, &s2.strip) else { continue };
+                if s2.cond_ok(&stem2, false) {
+                    let mut need = extra.to_vec();
+                    need.push(s2.flag);
+                    if self.root(&stem2.iter().collect::<String>(), &need, true) {
+                        return true;
+                    }
+                }
+            }
+        }
+        false
+    }
+
+    fn check_exact(&self, word: &str) -> bool {
+        if self.forbidden_word(word) {
+            return false;
+        }
+        if self.root(word, &[], false) {
+            return true;
+        }
+        let w: Vec<char> = word.chars().collect();
+        if self.suffixed(&w, &[], false) {
+            return true;
+        }
+        for p in &self.pfx {
+            let Some(stem) = strip_start(&w, &p.add, &p.strip) else { continue };
+            if !p.cond_ok(&stem, true) {
+                continue;
+            }
+            if self.root(&stem.iter().collect::<String>(), &[p.flag], true) {
+                return true;
+            }
+            if p.cross && self.suffixed(&stem, &[p.flag], true) {
+                return true;
+            }
+        }
+        false
+    }
+
+    /// Is `word` spelt correctly? Capitalised and upper-case forms of a lower-case word pass.
+    pub fn check(&self, word: &str) -> bool {
+        if word.is_empty() || word.chars().all(|c| !c.is_alphabetic()) {
+            return true;
+        }
+        if self.check_exact(word) {
+            return true;
+        }
+        let lower = word.to_lowercase();
+        let upper_tail = word.chars().skip(1).all(|c| !c.is_lowercase());
+        let cap_only = word.chars().next().is_some_and(char::is_uppercase) && word.chars().skip(1).all(|c| !c.is_uppercase());
+        let keep = |w: &str| self.words.get(w).is_some_and(|hs| hs.iter().any(|f| self.has(f, self.keep_case)));
+        if (cap_only || upper_tail) && !keep(&lower) && self.check_exact(&lower) {
+            return true;
+        }
+        if upper_tail && !cap_only {
+            let cap = capitalise(&lower);
+            if !keep(&cap) && self.check_exact(&cap) {
+                return true;
+            }
+        }
+        // A trailing full stop on an abbreviation (`etc.`) is part of the word in some dictionaries.
+        false
+    }
+
+    fn suggestible(&self, w: &str) -> bool {
+        self.check(w) && !self.words.get(w).is_some_and(|hs| hs.iter().all(|f| self.has(f, self.no_suggest) && !f.is_empty()))
+    }
+
+    /// Up to `n` corrections for a misspelt `word`, best first.
+    pub fn suggest(&self, word: &str, n: usize) -> Vec<String> {
+        let cap = word.chars().next().is_some_and(char::is_uppercase);
+        let lower = if cap && word.chars().skip(1).all(|c| !c.is_uppercase()) { word.to_lowercase() } else { word.to_string() };
+        let w: Vec<char> = lower.chars().collect();
+        let mut out: Vec<String> = vec![];
+        let mut seen = HashSet::new();
+        let mut push = |s: String, out: &mut Vec<String>| {
+            if s != lower && seen.insert(s.to_lowercase()) && s.split(' ').all(|p| self.suggestible(p)) {
+                out.push(s);
+            }
+        };
+        for (a, b) in &self.rep {
+            let mut from = 0;
+            while let Some(i) = lower.get(from..).and_then(|t| t.find(a.as_str())) {
+                let at = from + i;
+                push(format!("{}{}{}", &lower[..at], b, &lower[at + a.len()..]), &mut out);
+                from = at + a.len().max(1);
+            }
+        }
+        let try_chars: Vec<char> = if self.try_chars.is_empty() { "esianrtolcdugmphbyfvkwzxjq".chars().collect() } else { self.try_chars.clone() };
+        let s = |v: &[char]| v.iter().collect::<String>();
+        for i in 0..w.len().saturating_sub(1) {
+            let mut v = w.clone();
+            v.swap(i, i + 1);
+            push(s(&v), &mut out);
+        }
+        for i in 0..w.len() {
+            let mut v = w.clone();
+            v.remove(i);
+            push(s(&v), &mut out);
+        }
+        for i in 0..w.len() {
+            for c in &try_chars {
+                if *c != w[i] {
+                    let mut v = w.clone();
+                    v[i] = *c;
+                    push(s(&v), &mut out);
+                }
+            }
+        }
+        for i in 0..=w.len() {
+            for c in &try_chars {
+                let mut v = w.clone();
+                v.insert(i, *c);
+                push(s(&v), &mut out);
+            }
+        }
+        for i in 1..w.len() {
+            push(format!("{} {}", s(&w[..i]), s(&w[i..])), &mut out);
+        }
+        out.truncate(n);
+        if cap {
+            out = out.into_iter().map(|x| capitalise(&x)).collect();
+        }
+        out
+    }
+
+    /// Characters that belong inside words besides letters and digits (the `WORDCHARS` list).
+    pub fn word_chars(&self) -> &[char] {
+        &self.word_chars
+    }
+}
+
+fn capitalise(s: &str) -> String {
+    let mut c = s.chars();
+    c.next().map(|f| f.to_uppercase().chain(c).collect()).unwrap_or_default()
+}
+
+fn strip_end(w: &[char], add: &str, strip: &str) -> Option<Vec<char>> {
+    let add: Vec<char> = add.chars().collect();
+    if w.len() <= add.len() && strip.is_empty() || !w.ends_with(&add) {
+        return None;
+    }
+    let mut v = w.get(..w.len() - add.len())?.to_vec();
+    v.extend(strip.chars());
+    (!v.is_empty()).then_some(v)
+}
+
+fn strip_start(w: &[char], add: &str, strip: &str) -> Option<Vec<char>> {
+    let add: Vec<char> = add.chars().collect();
+    if w.len() <= add.len() && strip.is_empty() || !w.starts_with(&add) {
+        return None;
+    }
+    let mut v: Vec<char> = strip.chars().collect();
+    v.extend_from_slice(w.get(add.len()..)?);
+    (!v.is_empty()).then_some(v)
+}
+
+/// The folders searched for dictionaries, in order.
+pub fn search_dirs() -> Vec<PathBuf> {
+    let mut out = vec![];
+    if let Some(v) = std::env::var_os("DECKCRAFT_DICTIONARIES") {
+        out.extend(std::env::split_paths(&v));
+    }
+    let home = std::env::var_os("HOME").map(PathBuf::from);
+    if cfg!(target_os = "macos") {
+        out.extend(home.iter().map(|h| h.join("Library/Application Support/DeckCraft/Dictionaries")));
+        out.extend(home.iter().map(|h| h.join("Library/Spelling")));
+        out.push("/Library/Spelling".into());
+    } else if cfg!(target_os = "windows") {
+        out.extend(std::env::var_os("APPDATA").map(|a| PathBuf::from(a).join("DeckCraft").join("Dictionaries")));
+    } else {
+        let data = std::env::var_os("XDG_DATA_HOME").map(PathBuf::from).or_else(|| home.as_ref().map(|h| h.join(".local/share")));
+        out.extend(data.iter().map(|d| d.join("deckcraft/dictionaries")));
+        out.extend(data.iter().map(|d| d.join("hunspell")));
+        for d in ["/usr/share/hunspell", "/usr/share/myspell", "/usr/share/myspell/dicts", "/usr/local/share/hunspell", "/app/share/hunspell"] {
+            out.push(d.into());
+        }
+    }
+    out
+}
+
+/// `en-US` → `en_US`; the language alone (`en`) as a fallback.
+fn names(lang: &str) -> (String, String) {
+    let full = lang.replace('-', "_");
+    let base = full.split('_').next().unwrap_or("").to_lowercase();
+    (full, base)
+}
+
+/// The `.aff`/`.dic` pair for `lang` in `dirs`: the exact locale first, then any of its language.
+pub fn find_in(dirs: &[PathBuf], lang: &str) -> Option<(PathBuf, PathBuf)> {
+    let (full, base) = names(lang);
+    let pair = |d: &Path, stem: &str| {
+        let (a, b) = (d.join(format!("{stem}.aff")), d.join(format!("{stem}.dic")));
+        (a.is_file() && b.is_file()).then_some((a, b))
+    };
+    for d in dirs {
+        if let Some(p) = pair(d, &full) {
+            return Some(p);
+        }
+    }
+    for d in dirs {
+        if let Some(p) = pair(d, &base) {
+            return Some(p);
+        }
+        let Ok(rd) = std::fs::read_dir(d) else { continue };
+        let mut stems: Vec<String> = rd
+            .filter_map(|e| e.ok()?.file_name().into_string().ok())
+            .filter_map(|n| n.strip_suffix(".aff").map(str::to_string))
+            .filter(|n| n.to_lowercase().starts_with(&format!("{base}_")))
+            .collect();
+        stems.sort();
+        if let Some(p) = stems.iter().find_map(|s| pair(d, s)) {
+            return Some(p);
+        }
+    }
+    None
+}
+
+type Cache = Mutex<HashMap<String, Option<Arc<Dictionary>>>>;
+
+fn cache() -> &'static Cache {
+    static CACHE: OnceLock<Cache> = OnceLock::new();
+    CACHE.get_or_init(Default::default)
+}
+
+/// The dictionary for `lang` (a BCP-47 tag such as `en-US`), loaded once per process.
+pub fn dictionary(lang: &str) -> Option<Arc<Dictionary>> {
+    let cache = cache();
+    let key = lang.to_string();
+    if let Ok(c) = cache.lock()
+        && let Some(d) = c.get(&key)
+    {
+        return d.clone();
+    }
+    let loaded = find_in(&search_dirs(), lang).and_then(|(a, d)| {
+        let (a, d) = (std::fs::read(a).ok()?, std::fs::read(d).ok()?);
+        Some(Arc::new(Dictionary::parse(&a, &d)))
+    });
+    if let Ok(mut c) = cache.lock() {
+        c.insert(key, loaded.clone());
+    }
+    loaded
+}
+
+/// Use `d` for `lang` from now on in this process (a dictionary the app loaded itself).
+pub fn install(lang: &str, d: Dictionary) {
+    if let Ok(mut c) = cache().lock() {
+        c.insert(lang.to_string(), Some(Arc::new(d)));
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+
+    // A contributor-original miniature dictionary in Hunspell format.
+    pub(crate) const AFF: &str = "SET UTF-8\nTRY esianrtolcdugmphbyfvkwzxjq\nFORBIDDENWORD !\nNEEDAFFIX ?\nKEEPCASE K\n\
+REP 1\nREP f ph\n\
+PFX U Y 1\nPFX U 0 un .\n\
+SFX S Y 2\nSFX S y ies [^aeiou]y\nSFX S 0 s [^y]\n\
+SFX G Y 2\nSFX G e ing e\nSFX G 0 ing [^e]\n\
+SFX D Y 1\nSFX D 0 ed/S .\n";
+    pub(crate) const DIC: &str = "9\nslide/S\nmake/G\nhappy\ncity/S\ndo/U\nwork/USG\nphoto/S\nNASA/K\nfoo/?S\n";
+
+    fn d() -> Dictionary {
+        Dictionary::parse(AFF.as_bytes(), DIC.as_bytes())
+    }
+
+    #[test]
+    fn roots_affixes_and_cross_products_check() {
+        let d = d();
+        for w in ["slide", "slides", "making", "cities", "undo", "unworks", "working", "Slide", "SLIDES", "NASA", "foos"] {
+            assert!(d.check(w), "{w}");
+        }
+        for w in ["slidez", "makeing", "citys", "unslide", "Nasa", "nasa", "foo", "teh"] {
+            assert!(!d.check(w), "{w}");
+        }
+    }
+
+    #[test]
+    fn suggestions_come_from_edits_and_replacements() {
+        let d = d();
+        assert_eq!(d.suggest("sldie", 3).first().map(String::as_str), Some("slide"));
+        assert!(d.suggest("foto", 5).contains(&"photo".to_string()));
+        assert!(d.suggest("Slidse", 5).contains(&"Slides".to_string()));
+        assert!(d.suggest("workingslides", 5).contains(&"working slides".to_string()));
+    }
+
+    #[test]
+    fn long_and_numeric_flags_and_latin1() {
+        let d = Dictionary::parse(b"FLAG long\nSFX Aa Y 1\nSFX Aa 0 s .\n", b"1\ncat/Aa\n");
+        assert!(d.check("cats"));
+        let d = Dictionary::parse(b"FLAG num\nSFX 101 Y 1\nSFX 101 0 s .\n", b"1\ndog/7,101\n");
+        assert!(d.check("dogs"));
+        let d = Dictionary::parse(b"SET ISO8859-1\n", b"1\ncaf\xe9\n");
+        assert!(d.check("café"));
+    }
+
+    #[test]
+    fn dictionaries_are_found_by_locale_then_language() {
+        let dir = std::env::temp_dir().join(format!("deckcraft-dict-{}", std::process::id()));
+        let _ = std::fs::create_dir_all(&dir);
+        for n in ["en_GB", "de_DE"] {
+            let _ = std::fs::write(dir.join(format!("{n}.aff")), "");
+            let _ = std::fs::write(dir.join(format!("{n}.dic")), "");
+        }
+        let dirs = vec![dir.clone()];
+        let stem = |l: &str| find_in(&dirs, l).and_then(|(a, _)| a.file_stem().map(|s| s.to_string_lossy().into_owned()));
+        assert_eq!(stem("de-DE").as_deref(), Some("de_DE"));
+        assert_eq!(stem("en-US").as_deref(), Some("en_GB"));
+        assert_eq!(stem("fr-FR"), None);
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+}
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..f052d955 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,39 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn spelling_uses_a_dictionary_suggests_and_changes() {
+    crate::spell::install("xx-TEST", crate::spell::Dictionary::parse(crate::spell::tests::AFF.as_bytes(), crate::spell::tests::DIC.as_bytes()));
+    let mut s = session();
+    let r = s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 300, 100], "text": "Making sldie photos, sldie"})).unwrap();
+    let id = r["id"].as_u64().unwrap();
+    let v = s.execute("review.spelling", &json!({"lang": "xx-TEST"})).unwrap();
+    let list = v.as_array().unwrap();
+    assert_eq!(list.len(), 2, "{v}");
+    assert_eq!(list[0]["word"], "sldie");
+    assert_eq!(list[0]["suggestions"][0], "slide");
+    assert!(s.execute("review.spelling", &json!({"lang": "xx-TEST", "ignore": ["SLDIE"]})).unwrap().as_array().unwrap().is_empty());
+    let c = s.execute("review.spellingChange", &json!({"shape": id, "word": "sldie", "to": "slide"})).unwrap();
+    assert_eq!(c["changed"], 1);
+    assert_eq!(s.execute("review.spelling", &json!({"lang": "xx-TEST"})).unwrap().as_array().unwrap().len(), 1);
+    let c = s.execute("review.spellingChange", &json!({"word": "sldie", "to": "slide", "all": true})).unwrap();
+    assert_eq!(c["changed"], 1);
+    assert!(s.execute("review.spelling", &json!({"lang": "xx-TEST"})).unwrap().as_array().unwrap().is_empty());
+    // Whole words only, and one undo step per change.
+    assert_eq!(s.execute("review.spellingChange", &json!({"word": "slid", "to": "x", "all": true})).unwrap()["changed"], 0);
+    s.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(s.execute("review.spelling", &json!({"lang": "xx-TEST"})).unwrap().as_array().unwrap().len(), 1);
+}
+
+#[test]
+fn spelling_without_a_dictionary_falls_back_to_common_misspellings() {
+    let mut s = session();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 300, 100], "text": "Teh qzxv"})).unwrap();
+    let v = s.execute("review.spelling", &json!({"lang": "zz-NONE"})).unwrap();
+    assert_eq!(v.as_array().map(Vec::len), Some(1));
+    assert_eq!(v[0]["word"], "Teh");
+    let d = s.execute("review.dictionary", &json!({"lang": "zz-NONE"})).unwrap();
+    assert!(d["found"].is_null());
+    assert_eq!(d["available"], false);
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..cca5dc5d 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -510,19 +510,77 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             ok || cancel
         }
         "spelling" => {
-            let v = app.session.execute("review.spelling", &json!({})).unwrap_or_default();
+            // Words skipped with Ignore All while the dialog is open, one per line.
+            let ignored = d.get("ignore", "");
+            let ignore: Vec<&str> = ignored.lines().filter(|l| !l.is_empty()).collect();
+            let v = app.session.execute("review.spelling", &json!({"ignore": ignore})).unwrap_or_default();
             let list = v.as_array().cloned().unwrap_or_default();
+            let info = app.session.execute("review.dictionary", &json!({})).unwrap_or_default();
+            let available = info.get("available").and_then(Value::as_bool).unwrap_or(false);
+            match info.get("found").and_then(Value::as_str) {
+                Some(f) if available => {
+                    ui.label(egui::RichText::new(format!("Dictionary: {}", f.rsplit(['/', '\\']).next().unwrap_or(f))).small().weak())
+                }
+                _ if available => {
+                    ui.label(egui::RichText::new(format!("Dictionary: {}", info.get("lang").and_then(Value::as_str).unwrap_or(""))).small().weak())
+                }
+                _ => ui.label(
+                    egui::RichText::new(format!(
+                        "No {} dictionary is installed, so only common misspellings are found. Put a Hunspell .aff/.dic pair in {}.",
+                        info.get("lang").and_then(Value::as_str).unwrap_or("en-US"),
+                        info.get("folders")
+                            .and_then(Value::as_array)
+                            .and_then(|a| a.get(1).or(a.first()))
+                            .and_then(Value::as_str)
+                            .unwrap_or("a dictionaries folder")
+                    ))
+                    .small()
+                    .weak(),
+                ),
+            };
             if list.is_empty() {
                 ui.label("The spelling check is complete. No issues found.");
             }
-            for item in &list {
-                ui.horizontal(|ui| {
+            let mut add_ignore = None;
+            egui::ScrollArea::vertical().max_height(320.0).show(ui, |ui| {
+                for item in &list {
                     let w = item.get("word").and_then(Value::as_str).unwrap_or("");
-                    ui.label(format!("Slide {}: “{w}”", item.get("slide").and_then(Value::as_u64).unwrap_or(0) + 1));
-                    if ui.small_button("Go to").clicked() {
-                        let _ = app.run("slide.go", json!({"index": item.get("slide").cloned().unwrap_or_default()}));
+                    let slide = item.get("slide").cloned().unwrap_or_default();
+                    let shape = item.get("shape").cloned().unwrap_or_default();
+                    ui.horizontal(|ui| {
+                        ui.label(format!("Slide {}: “{w}”", slide.as_u64().unwrap_or(0) + 1));
+                        if ui.small_button("Go to").clicked() {
+                            let _ = app.run("slide.go", json!({"index": slide}));
+                            let _ = app.run("edit.select", json!({"ids": [shape]}));
+                        }
+                        if ui.small_button("Ignore All").clicked() {
+                            add_ignore = Some(w.to_string());
+                        }
+                    });
+                    let sug: Vec<String> = item
+                        .get("suggestions")
+                        .and_then(Value::as_array)
+                        .map(|a| a.iter().filter_map(Value::as_str).map(str::to_string).collect())
+                        .unwrap_or_default();
+                    if !sug.is_empty() {
+                        ui.horizontal_wrapped(|ui| {
+                            ui.add_space(16.0);
+                            ui.label(egui::RichText::new("Change to:").weak());
+                            for to in &sug {
+                                let r = ui.small_button(to.as_str()).on_hover_text("Click to change this one; Shift-click to change all");
+                                if r.clicked() {
+                                    let all = ui.input(|i| i.modifiers.shift);
+                                    let p =
+                                        if all { json!({"word": w, "to": to, "all": true}) } else { json!({"shape": shape, "word": w, "to": to}) };
+                                    run(app, "review.spellingChange", p);
+                                }
+                            }
+                        });
                     }
-                });
+                }
+            });
+            if let Some(w) = add_ignore {
+                d.fields.insert("ignore".into(), format!("{ignored}{w}\n"));
             }
             let (ok, cancel) = buttons(ui, "Close");
             ok || cancel
@@ -829,3 +887,7 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+#[path = "spelling_tests.rs"]
+mod spelling_tests;
diff --git a/crates/ui-egui/src/spelling_tests.rs b/crates/ui-egui/src/spelling_tests.rs
new file mode 100644
index 00000000..67e3ee64
--- /dev/null
+++ b/crates/ui-egui/src/spelling_tests.rs
@@ -0,0 +1,46 @@
+//! The Spelling dialog with a dictionary: suggestions change the word, Ignore All hides it.
+#![allow(clippy::unwrap_used, clippy::expect_used)]
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+#[test]
+fn spelling_dialog_changes_and_ignores_words() {
+    let aff = "SET UTF-8\nTRY esianrtolcdugmphbyfvkwzxjq\nSFX S Y 1\nSFX S 0 s .\n";
+    let dic = "6\nthe/S\nslide/S\nquarter/S\nplan/S\nour\nfor\n";
+    deckcraft_engine::spell::install("en-US", deckcraft_engine::spell::Dictionary::parse(aff.as_bytes(), dic.as_bytes()));
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.session.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 500, 120], "text": "Our plna for teh quarter"})).unwrap();
+    app.dialog = Some(crate::dialogs::Dialog::new("spelling"));
+    let mut h = Harness::builder().with_size(egui::vec2(1100.0, 700.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    if let (Ok(path), Ok(img)) = (std::env::var("DECKCRAFT_PNG_OUT"), h.render()) {
+        let _ = img.save(path);
+    }
+    h.get_by_label("plan").click();
+    h.run_steps(3);
+    let text = |h: &Harness<'_, SlideApp>| {
+        let st = h.state().session.active().unwrap();
+        let mut out = String::new();
+        deckcraft_model::walk(&st.doc.slides[0].shapes, &mut |s, _| {
+            if let Some(t) = &s.text {
+                out += &t.text();
+            }
+        });
+        out
+    };
+    assert!(text(&h).contains("Our plan for teh"), "{}", text(&h));
+    h.get_by_label("Ignore All").click();
+    h.run_steps(3);
+    assert!(h.query_by_label_contains("No issues found").is_some());
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..f965a5d6 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -175,9 +175,13 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
   rigs and materials, Format Shape page).
 
 ### Proofing: spelling, thesaurus, AutoCorrect
-- **Evidence:** `review.spelling` checks a small built-in list of frequent misspellings
-  (`crates/engine/src/cmd/review.rs`); no dictionaries, no thesaurus, no AutoCorrect.
-- **Estimate:** 8–14 h (Hunspell-format dictionaries under an open licence per language).
+- **Evidence:** `review.spelling` checks with Hunspell-format dictionaries the system already has
+  (`crates/engine/src/spell.rs`: affixes, cross products, one level of continuation, case rules,
+  suggestions; no compounding) and the Spelling dialog changes or ignores words, but none ship with
+  DeckCraft, so without one installed (always on Windows and the web) only a short list of common
+  misspellings is found. No red squiggles while typing, no per-run language, no Add to Dictionary.
+  Thesaurus (#549) and AutoCorrect (#521) have open PRs.
+- **Estimate:** 4–8 h (bundle openly licensed dictionaries, squiggles, custom dictionary, compounding).
 
 ### Equations
 - **Evidence:** checklist row missing; PR #55 (OMML editor, +10.5k lines) is open.
@@ -256,6 +260,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Spelling checks with installed Hunspell dictionaries and suggests corrections |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |

From 1a0ffc6413c61594ab2d57e3e745bedfcbf28e7b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:56:23 +0300
Subject: [PATCH 226/376] Draw: pen pressure scales ink width

A pen reading of 1 is the full pen width. A lighter touch draws a thinner
stroke, and a zero reading stays visible at 8% of the pen. A mouse, a
missing or non-finite reading, and a stroke whose samples are all the old
placeholder 0.5 still draw at the pen width. PPTX keeps one width per
stroke: the mean of the samples for a pressured stroke, the pen width for
a legacy one. Tilt is not read.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                               |  4 ++-
 crates/engine/src/cmd/selection_tests.rs |  2 +-
 crates/engine/src/tests.rs               | 41 +++++++++++++++++-----
 crates/engine/src/tools.rs               | 23 +++++++++++--
 crates/mcp/src/headless.rs               |  3 +-
 crates/model/src/lib.rs                  | 21 +++++++++++-
 crates/model/src/tests.rs                | 13 +++++++
 crates/pptx/src/write/shapes.rs          | 11 +++++-
 crates/pptx/tests/roundtrip.rs           | 35 +++++++++++++++++--
 crates/render/src/lib.rs                 | 29 +++++++++-------
 crates/render/src/tests.rs               | 43 ++++++++++++++++++++++++
 crates/ui-egui/src/canvas.rs             | 29 ++++++++++++++--
 crates/ui-egui/src/control.rs            |  7 ++--
 docs/control-protocol.md                 |  2 +-
 docs/gaps.md                             |  5 +--
 docs/hardware-parity.md                  |  9 ++---
 docs/roadmap.md                          | 10 +++---
 docs/target-app-parity.md                |  7 ++--
 18 files changed, 244 insertions(+), 50 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..49390d16 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: pen pressure scales ink width; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Draw: pen pressure scales ink width when the pointer reports it (a mouse or a missing reading stays at the pen width; a stroke saved as a flat 0.5 still draws at the pen width). Tilt is not read |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: pen pressure scales ink width |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/selection_tests.rs b/crates/engine/src/cmd/selection_tests.rs
index 11d99b7c..69bcc3c8 100644
--- a/crates/engine/src/cmd/selection_tests.rs
+++ b/crates/engine/src/cmd/selection_tests.rs
@@ -201,7 +201,7 @@ fn locked_objects_are_picked_on_the_canvas_but_not_dragged() {
     s.execute("shape.lock", &json!({"id": a, "locked": true})).unwrap();
     s.execute("edit.select", &json!({"ids": []})).unwrap();
     let n = s.doc().unwrap().history.undo.len();
-    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0 };
+    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0, pressure: None };
     // A: x 20..120, y 50..130.
     s.pointer(ev(PointerKind::Down, 60.0, 90.0)).unwrap();
     assert_eq!(selected(&s), vec![a], "a click selects a locked object");
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..09a0f0d3 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -126,7 +126,7 @@ fn align_and_distribute() {
 fn pointer_draw_move_resize() {
     let mut s = session();
     s.set_tool(ToolKind::Shape { preset: "rect".into() });
-    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0 };
+    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0, pressure: None };
     s.pointer(ev(PointerKind::Down, 100.0, 100.0)).unwrap();
     s.pointer(ev(PointerKind::Drag, 200.0, 180.0)).unwrap();
     let r = s.pointer(ev(PointerKind::Up, 200.0, 180.0)).unwrap();
@@ -157,7 +157,7 @@ fn pointer_draw_move_resize() {
 #[test]
 fn click_into_placeholder_starts_editing() {
     let mut s = session();
-    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0 };
+    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0, pressure: None };
     s.pointer(ev(PointerKind::Down, 480.0, 200.0)).unwrap();
     s.pointer(ev(PointerKind::Up, 480.0, 200.0)).unwrap();
     assert!(s.doc().unwrap().selection.text.is_some());
@@ -290,7 +290,7 @@ fn drawing_a_line_between_shapes_glues_it() {
     let b = s.execute("shape.insert", &json!({"preset": "rect", "rect": [400, 100, 100, 100]})).unwrap()["id"].as_u64().unwrap();
     s.execute("edit.deselect", &json!({})).unwrap();
     s.tool.kind = tools::ToolKind::Shape { preset: "straightConnector1".into() };
-    let ev = |kind, x: f64, y: f64| tools::PointerEvent { kind, x, y, mods: Default::default(), tol: 4.0 };
+    let ev = |kind, x: f64, y: f64| tools::PointerEvent { kind, x, y, mods: Default::default(), tol: 4.0, pressure: None };
     // Right site of the ellipse (200,150) → left site of the rect (400,150), a little off.
     s.pointer(ev(tools::PointerKind::Down, 202.0, 151.0)).unwrap();
     s.pointer(ev(tools::PointerKind::Drag, 300.0, 150.0)).unwrap();
@@ -323,7 +323,7 @@ fn freeform_tools_and_command() {
     s.execute("edit.redo", &json!({})).unwrap();
     assert_eq!(s.doc().unwrap().shapes().len(), before + 1);
 
-    let ev = |kind, x: f64, y: f64| tools::PointerEvent { kind, x, y, mods: Default::default(), tol: 3.0 };
+    let ev = |kind, x: f64, y: f64| tools::PointerEvent { kind, x, y, mods: Default::default(), tol: 3.0, pressure: None };
     // Polygon: click, click, click, click on the start → closed, filled.
     s.set_tool(tools::ToolKind::Shape { preset: "freeform".into() });
     for (x, y) in [(300.0, 300.0), (400.0, 300.0), (400.0, 400.0)] {
@@ -376,7 +376,7 @@ fn double_click_in_table_uses_grown_row_heights() {
     for row in 0..3 {
         s.execute("table.rowHeight", &json!({"id": id, "row": row, "height": 4.0})).unwrap();
     }
-    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0 };
+    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0, pressure: None };
     s.pointer(ev(PointerKind::DoubleClick, 120.0, 106.0)).unwrap();
     assert_eq!(s.doc().unwrap().selection.text.as_ref().and_then(|t| t.cell), Some((0, 0)));
 }
@@ -580,7 +580,7 @@ fn shapes_off_the_slide_can_be_selected_and_moved() {
     // Inserting off the slide keeps the box where it was asked for.
     assert_eq!(s.execute("shape.inspect", &json!({"id": off})).unwrap()["box"]["x"], 1000.0);
     s.execute("edit.select", &json!({"ids": []})).unwrap();
-    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0 };
+    let ev = |kind, x, y| PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0, pressure: None };
     // Hover and click wholly off the slide.
     assert!(matches!(s.hit_test(deckcraft_geom::Point::new(1060.0, 140.0), 3.0), Some(tools::Hit::Shape { id, .. }) if id.0 as u64 == off));
     s.pointer(ev(PointerKind::Down, 1060.0, 140.0)).unwrap();
@@ -698,9 +698,9 @@ fn ime_composition_is_kept_by_a_key_a_click_or_another_command() {
     assert_eq!(s.doc().unwrap().history.undo.len(), undo0 + 1);
 
     s.compose_text("녕", None).unwrap();
-    s.pointer(PointerEvent { kind: PointerKind::Move, x: 5.0, y: 5.0, mods: Mods::default(), tol: 4.0 }).unwrap();
+    s.pointer(PointerEvent { kind: PointerKind::Move, x: 5.0, y: 5.0, mods: Mods::default(), tol: 4.0, pressure: None }).unwrap();
     assert!(s.doc().unwrap().composition.is_some(), "hovering keeps composing");
-    s.pointer(PointerEvent { kind: PointerKind::Down, x: 5.0, y: 5.0, mods: Mods::default(), tol: 4.0 }).unwrap();
+    s.pointer(PointerEvent { kind: PointerKind::Down, x: 5.0, y: 5.0, mods: Mods::default(), tol: 4.0, pressure: None }).unwrap();
     assert!(s.doc().unwrap().composition.is_none(), "a click settles it");
     assert_eq!(title_text(&s), "안녕");
 
@@ -835,3 +835,28 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+#[test]
+fn pen_pressure_is_kept_and_a_mouse_draws_at_full_width() {
+    let mut s = session();
+    s.set_tool(tools::ToolKind::Ink { mode: "pen".into(), color: deckcraft_model::Rgba::rgb(20, 20, 20), width: 4.0 });
+    let ev = |kind, x, y, pressure| tools::PointerEvent { kind, x, y, mods: Mods::default(), tol: 3.0, pressure };
+    s.pointer(ev(PointerKind::Down, 40.0, 80.0, Some(0.2))).unwrap();
+    s.pointer(ev(PointerKind::Drag, 80.0, 80.0, Some(1.0))).unwrap();
+    s.pointer(ev(PointerKind::Drag, 120.0, 80.0, Some(0.4))).unwrap();
+    s.pointer(ev(PointerKind::Up, 120.0, 80.0, Some(0.4))).unwrap();
+    s.pointer(ev(PointerKind::Down, 40.0, 160.0, None)).unwrap();
+    s.pointer(ev(PointerKind::Drag, 100.0, 160.0, Some(f32::NAN))).unwrap();
+    s.pointer(ev(PointerKind::Up, 100.0, 160.0, None)).unwrap();
+    let got = ink_pressures(&s);
+    assert_eq!(got, vec![vec![0.2, 1.0, 0.4], vec![1.0, 1.0]]);
+}
+
+fn ink_pressures(s: &Session) -> Vec<Vec<f32>> {
+    let st = s.doc().unwrap();
+    let Some(sh) = st.shapes().iter().rev().find(|sh| matches!(sh.kind, deckcraft_model::ShapeKind::Ink { .. })) else {
+        return vec![];
+    };
+    let deckcraft_model::ShapeKind::Ink { strokes } = &sh.kind else { return vec![] };
+    strokes.iter().map(|stroke| stroke.points.iter().map(|p| p.2).collect()).collect()
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..915eb440 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -40,6 +40,10 @@ pub struct PointerEvent {
     pub mods: Mods,
     /// Hit tolerance in points (≈ 4 screen px at the current zoom).
     pub tol: f64,
+    /// Pen pressure `0..=1` when the device reported one. `None` is a mouse: the stroke
+    /// is stored at full pen width.
+    #[serde(default)]
+    pub pressure: Option<f32>,
 }
 
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
@@ -178,6 +182,8 @@ pub struct ToolState {
     pub path_preview: Vec<Point>,
     pub path_smooth: bool,
     pub path_closing: bool,
+    /// Pressure from the pointer event being handled, if the device reported one.
+    pressure: Option<f32>,
 }
 
 impl ToolState {
@@ -267,6 +273,7 @@ impl Session {
     pub fn pointer(&mut self, ev: PointerEvent) -> Result<Value> {
         let tol = if ev.tol > 0.0 { ev.tol } else { 4.0 };
         let p = Point::new(ev.x, ev.y);
+        self.tool.pressure = ev.pressure.filter(|v| v.is_finite()).map(|v| v.clamp(0.0, 1.0));
         if !(p.x.is_finite() && p.y.is_finite()) {
             return Ok(Value::Null);
         }
@@ -355,8 +362,9 @@ impl Session {
                 if mode == "eraser" {
                     return self.erase_at(p, tol);
                 }
-                self.tool.drag = Some(Drag::Ink { points: vec![(p.x, p.y, 0.5)] });
-                self.tool.ink_preview = vec![(p.x, p.y, 0.5)];
+                let sample = self.ink_sample(p);
+                self.tool.drag = Some(Drag::Ink { points: vec![sample] });
+                self.tool.ink_preview = vec![sample];
                 return Ok(Value::Null);
             }
             ToolKind::Select => {}
@@ -653,7 +661,7 @@ impl Session {
                 self.tool.drag = Some(Drag::Freeform { mode, points, pressed });
             }
             Drag::Ink { mut points } => {
-                points.push((p.x, p.y, 0.5));
+                points.push(self.ink_sample(p));
                 self.tool.ink_preview = points.clone();
                 self.tool.drag = Some(Drag::Ink { points });
             }
@@ -1040,6 +1048,15 @@ impl Session {
         nx
     }
 
+    /// One ink sample. No device reading is full pen width (`1`), not the old placeholder `0.5`.
+    fn ink_sample(&self, p: Point) -> (f64, f64, f32) {
+        let pressure = match self.tool.pressure {
+            Some(v) if v.is_finite() => v.clamp(0.0, 1.0),
+            _ => 1.0,
+        };
+        (p.x, p.y, pressure)
+    }
+
     fn add_ink(&mut self, points: Vec<(f64, f64, f32)>) -> Result<Value> {
         let ToolKind::Ink { mode, color, width } = self.tool.kind.clone() else { return Ok(Value::Null) };
         let stroke = deckcraft_model::InkStroke { points, color, width, highlighter: mode == "highlighter" };
diff --git a/crates/mcp/src/headless.rs b/crates/mcp/src/headless.rs
index 512e7cc4..2f126af0 100644
--- a/crates/mcp/src/headless.rs
+++ b/crates/mcp/src/headless.rs
@@ -88,7 +88,8 @@ impl Headless {
             let x = e.get("x").and_then(Value::as_f64).ok_or("pointer event needs `x`")?;
             let y = e.get("y").and_then(Value::as_f64).ok_or("pointer event needs `y`")?;
             let mods = e.get("mods").map(mods_from).unwrap_or(base);
-            last = self.session.pointer(PointerEvent { kind, x, y, mods, tol: 3.0 }).map_err(|e| e.to_string())?;
+            let pressure = e.get("pressure").and_then(Value::as_f64).map(|v| v as f32);
+            last = self.session.pointer(PointerEvent { kind, x, y, mods, tol: 3.0, pressure }).map_err(|e| e.to_string())?;
         }
         self.session.ui_requests.clear();
         Ok(json!({"result": last, "selection": self.session.active().map(|d| serde_json::to_value(&d.selection).unwrap_or_default())}))
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..a4f7a098 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -249,7 +249,8 @@ pub struct MediaClip {
     pub height: u32,
 }
 
-/// One ink stroke (Draw tab): points in slide coordinates with pressure.
+/// One ink stroke (Draw tab): points in slide coordinates with pressure (`0..=1`,
+/// where `1` is [`InkStroke::width`]).
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "camelCase")]
 pub struct InkStroke {
@@ -259,6 +260,24 @@ pub struct InkStroke {
     pub highlighter: bool,
 }
 
+/// True when every sample is the placeholder `0.5` written before a device reported pressure.
+/// Those strokes were drawn at [`InkStroke::width`] and still are.
+pub fn ink_pressure_is_legacy(points: &[(f64, f64, f32)]) -> bool {
+    !points.is_empty() && points.iter().all(|p| (p.2 - 0.5).abs() <= 1.0e-3)
+}
+
+/// Width of one ink sample. `pressure` of `1` is the pen width. A legacy flat stroke
+/// (`legacy`) draws at the pen width. A missing reading draws at the pen width too.
+/// A light touch stays visible (at least 8% of the pen).
+pub fn ink_sample_width(pen: f64, pressure: f32, legacy: bool) -> f64 {
+    let pen = if pen.is_finite() { pen.abs() } else { 0.0 };
+    if legacy {
+        return pen;
+    }
+    let p = if pressure.is_finite() { pressure.clamp(0.08, 1.0) } else { 1.0 };
+    pen * f64::from(p)
+}
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase", tag = "type")]
 pub enum ShapeKind {
diff --git a/crates/model/src/tests.rs b/crates/model/src/tests.rs
index 2c3b4ced..4b8589d0 100644
--- a/crates/model/src/tests.rs
+++ b/crates/model/src/tests.rs
@@ -231,3 +231,16 @@ fn sibling_lists_and_parents_reach_into_groups() {
     assert_eq!(sibling_list_mut(&mut tree, ShapeId(5)).map(|v| ids(v)), Some(vec![5]));
     assert!(sibling_list_mut(&mut tree, ShapeId(9)).is_none());
 }
+
+#[test]
+fn ink_width_follows_pressure_and_keeps_the_old_placeholder() {
+    assert!(ink_pressure_is_legacy(&[(0.0, 0.0, 0.5), (1.0, 1.0, 0.5)]));
+    assert!(!ink_pressure_is_legacy(&[(0.0, 0.0, 0.5), (1.0, 1.0, 1.0)]));
+    assert!(!ink_pressure_is_legacy(&[]));
+    assert!((ink_sample_width(8.0, 0.5, true) - 8.0).abs() < 1e-9);
+    assert!((ink_sample_width(8.0, 1.0, false) - 8.0).abs() < 1e-9);
+    assert!((ink_sample_width(8.0, 0.25, false) - 2.0).abs() < 1e-9);
+    let floor = ink_sample_width(8.0, 0.0, false);
+    assert!((floor - 0.64).abs() < 1e-4, "a light touch stays visible, got {floor}");
+    assert!((ink_sample_width(8.0, f32::NAN, false) - 8.0).abs() < 1e-9);
+}
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..836f9f5c 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -408,6 +408,15 @@ fn ink_shape(st: &deckcraft_model::InkStroke, i: usize) -> Option<Shape> {
         return None;
     }
     let (w, h) = ((x1 - x0).max(1.0), (y1 - y0).max(1.0));
+    // PPTX keeps one line width. A pressured stroke exports at its mean sample width;
+    // a legacy flat `0.5` stroke stays at the pen width.
+    let legacy = deckcraft_model::ink_pressure_is_legacy(&st.points);
+    let width = if legacy {
+        st.width
+    } else {
+        let n = st.points.len().max(1) as f64;
+        st.points.iter().map(|p| deckcraft_model::ink_sample_width(st.width, p.2, false)).sum::<f64>() / n
+    };
     let mut d = String::new();
     for (k, (px, py)) in pts.iter().enumerate() {
         d.push_str(if k == 0 { "M " } else { "L " });
@@ -426,7 +435,7 @@ fn ink_shape(st: &deckcraft_model::InkStroke, i: usize) -> Option<Shape> {
         line: Some(deckcraft_model::Line {
             cap: Some(deckcraft_model::style::LineCap::Round),
             join: Some(deckcraft_model::style::LineJoin::Round),
-            ..deckcraft_model::Line::solid(c, st.width.max(0.25))
+            ..deckcraft_model::Line::solid(c, width.max(0.25))
         }),
         ..Default::default()
     })
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..3b3cd5de 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -487,9 +487,40 @@ fn pictures_media_and_ink_round_trip() {
     assert_eq!((m.trim_start_ms, m.fade_in_ms), (500, 250));
     assert!(q.media(m.media).is_some_and(|x| x.data.starts_with(b"\x00\x00\x00\x18ftyp")));
     assert!(m.poster.is_some());
-    // Ink comes back as freeform lines in a group.
+    // Ink comes back as freeform lines in a group. A flat 0.5 stroke keeps the pen width.
     let ink = by_name(&q.slides[2], "Ink");
-    assert!(matches!(&ink.kind, ShapeKind::Group { children, .. } if children.len() == 1 && matches!(children[0].geom, Geom::Custom { .. })));
+    let ShapeKind::Group { children, .. } = &ink.kind else { panic!("ink is not a group: {:?}", ink.kind) };
+    assert_eq!(children.len(), 1);
+    assert!(matches!(children[0].geom, Geom::Custom { .. }));
+    let w = children[0].line.as_ref().and_then(|l| l.width).unwrap_or(0.0);
+    assert!((w - 3.0).abs() < 0.05, "a flat 0.5 stroke keeps the pen width, got {w}");
+}
+
+#[test]
+fn pressured_ink_exports_at_its_mean_width() {
+    let mut p = Presentation::default();
+    let id = ShapeId(p.alloc_id());
+    let slide = std::sync::Arc::make_mut(&mut p.slides[0]);
+    slide.shapes.push(Shape {
+        id,
+        name: "Ink".into(),
+        xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)),
+        kind: ShapeKind::Ink {
+            strokes: vec![InkStroke {
+                points: vec![(10.0, 10.0, 1.0), (40.0, 10.0, 0.5), (80.0, 10.0, 0.0)],
+                color: Rgba::rgb(0, 0, 0),
+                width: 10.0,
+                highlighter: false,
+            }],
+        },
+        ..Default::default()
+    });
+    let q = round(&p);
+    let ink = by_name(&q.slides[0], "Ink");
+    let ShapeKind::Group { children, .. } = &ink.kind else { panic!("{:?}", ink.kind) };
+    let w = children[0].line.as_ref().and_then(|l| l.width).unwrap_or(0.0);
+    // Full, half, and the 8% floor: (10 + 5 + 0.8) / 3.
+    assert!((w - (10.0 + 5.0 + 0.8) / 3.0).abs() < 0.05, "{w}");
 }
 
 #[test]
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..5f243e9f 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -844,24 +844,29 @@ impl Renderer {
             }
             ShapeKind::Ink { strokes } => {
                 for sk in strokes {
-                    let w = if sk.width.is_finite() { sk.width.abs() } else { 0.0 };
-                    for (px, py, _) in &sk.points {
+                    let legacy = deckcraft_model::ink_pressure_is_legacy(&sk.points);
+                    let pen = if sk.width.is_finite() { sk.width.abs() } else { 0.0 };
+                    for (px, py, pr) in &sk.points {
+                        let w = deckcraft_model::ink_sample_width(pen, *pr, legacy);
                         self.track(parent, Rect::new(*px, *py, *px, *py).inflate(w, w));
                     }
-                    let mut bp = BezPath::new();
-                    for (i, (px, py, _)) in sk.points.iter().enumerate() {
-                        if i == 0 {
-                            bp.move_to((*px, *py));
-                        } else {
-                            bp.line_to((*px, *py));
-                        }
+                    let pts: Vec<(f64, f64, f32)> = sk.points.iter().copied().filter(|p| p.0.is_finite() && p.1.is_finite()).collect();
+                    if pts.len() < 2 {
+                        continue;
                     }
                     let (base, rel) = self.line_space(parent, depth);
-                    bp.apply_affine(rel);
                     ctx.set_transform(base);
                     ctx.set_paint(color(sk.color, if sk.highlighter { 0.4 } else { 1.0 }));
-                    ctx.set_stroke(kurbo::Stroke::new(sk.width.max(0.1)).with_caps(kurbo::Cap::Round).with_join(kurbo::Join::Round));
-                    ctx.stroke_path(&bp);
+                    for pair in pts.windows(2) {
+                        let mut bp = BezPath::new();
+                        bp.move_to((pair[0].0, pair[0].1));
+                        bp.line_to((pair[1].0, pair[1].1));
+                        bp.apply_affine(rel);
+                        let a = deckcraft_model::ink_sample_width(pen, pair[0].2, legacy);
+                        let b = deckcraft_model::ink_sample_width(pen, pair[1].2, legacy);
+                        ctx.set_stroke(kurbo::Stroke::new(((a + b) * 0.5).max(0.1)).with_caps(kurbo::Cap::Round).with_join(kurbo::Join::Round));
+                        ctx.stroke_path(&bp);
+                    }
                 }
             }
             _ => self.geometry_shape(ctx, f, rctx, s, m, x.w, x.h, &st, depth),
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..175b9a54 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -35,6 +35,49 @@ fn shape_fill_uses_theme_accent() {
     assert_eq!(img.pixel(50, 50), [255, 255, 255, 255]);
 }
 
+#[test]
+fn ink_pressure_tapers_the_stroke_and_a_flat_half_stays_full_width() {
+    let opts = RenderOpts { scale: 1.0, ..Default::default() };
+    let tapered = render_slide(&ink_line(1.0, 0.12), 0, &opts);
+    let flat = render_slide(&ink_line(0.5, 0.5), 0, &opts);
+    let full = render_slide(&ink_line(1.0, 1.0), 0, &opts);
+    let heavy = dark_in(&tapered, 50, 140, 70, 130);
+    let light = dark_in(&tapered, 280, 360, 70, 130);
+    assert!(heavy > light * 3, "a firm point covers more of the slide than a light one ({heavy} vs {light})");
+    let (a, b) = (dark_in(&flat, 40, 370, 70, 130), dark_in(&full, 40, 370, 70, 130));
+    assert!(a > 100 && (a as i32 - b as i32).unsigned_abs() * 10 < a as u32, "the old constant 0.5 still draws at the pen width ({a} vs {b})");
+}
+
+fn ink_line(left: f32, right: f32) -> Presentation {
+    let points = (0..=40)
+        .map(|i| {
+            let pressure = if i < 20 { left } else { right };
+            (40.0 + f64::from(i) * 8.0, 100.0, pressure)
+        })
+        .collect();
+    let sh = Shape {
+        id: ShapeId(7),
+        xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)),
+        kind: ShapeKind::Ink {
+            strokes: vec![deckcraft_model::InkStroke { points, color: deckcraft_color::Rgba::rgb(0, 0, 0), width: 24.0, highlighter: false }],
+        },
+        ..Default::default()
+    };
+    deck_with(vec![sh])
+}
+
+fn dark_in(img: &Image, x0: u32, x1: u32, y0: u32, y1: u32) -> usize {
+    let mut n = 0;
+    for y in y0..y1 {
+        for x in x0..x1 {
+            if img.pixel(x, y)[0] < 200 {
+                n += 1;
+            }
+        }
+    }
+    n
+}
+
 #[test]
 fn text_draws_ink() {
     let mut sh = Shape { id: ShapeId(501), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), text_box: true, ..Default::default() };
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..2041acda 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -371,7 +371,8 @@ fn pointer(app: &mut SlideApp, ui: &Ui, resp: &egui::Response, xf: Xf) {
     let m = mods(ui);
     let Some(pos) = resp.interact_pointer_pos().or(resp.hover_pos()) else { return };
     let p = xf.to_slide(pos);
-    let ev = |kind| PointerEvent { kind, x: p.x, y: p.y, mods: m, tol };
+    let pressure = reported_pressure(ui);
+    let ev = |kind| PointerEvent { kind, x: p.x, y: p.y, mods: m, tol, pressure };
     let primary = ui.input(|i| i.pointer.primary_pressed());
     if resp.hovered() && !app.session.tool.dragging() {
         let _ = app.session.pointer(ev(PointerKind::Move));
@@ -581,13 +582,35 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
     if app.session.tool.ink_preview.len() > 1
         && let ToolKind::Ink { color, width, mode } = &app.session.tool.kind
     {
-        let pts: Vec<Pos2> = app.session.tool.ink_preview.iter().map(|(x, y, _)| xf.to_screen(Point::new(*x, *y))).collect();
+        let pts = &app.session.tool.ink_preview;
+        let legacy = deckcraft_engine::model::ink_pressure_is_legacy(pts);
         let c = theme::to_color32(*color);
         let c = if mode == "highlighter" { c.gamma_multiply(0.45) } else { c };
-        painter.add(egui::Shape::line(pts, Stroke::new((*width as f32 * xf.scale).max(1.0), c)));
+        for pair in pts.windows(2) {
+            let a = deckcraft_engine::model::ink_sample_width(*width, pair[0].2, legacy);
+            let b = deckcraft_engine::model::ink_sample_width(*width, pair[1].2, legacy);
+            let sw = ((a + b) * 0.5 * f64::from(xf.scale)).max(1.0) as f32;
+            let p0 = xf.to_screen(Point::new(pair[0].0, pair[0].1));
+            let p1 = xf.to_screen(Point::new(pair[1].0, pair[1].1));
+            painter.add(egui::Shape::line(vec![p0, p1], Stroke::new(sw, c)));
+        }
     }
 }
 
+/// Pressure from a touch or pen this frame (`0..=1`). A mouse reports none.
+fn reported_pressure(ui: &Ui) -> Option<f32> {
+    ui.input(|i| {
+        i.events.iter().rev().find_map(|e| match e {
+            egui::Event::Touch { force: Some(f), phase, .. }
+                if matches!(phase, egui::TouchPhase::Start | egui::TouchPhase::Move) && f.is_finite() =>
+            {
+                Some(f.clamp(0.0, 1.0))
+            }
+            _ => None,
+        })
+    })
+}
+
 fn rotate_handle(p: &egui::Painter, c: Pos2, t: &Tokens) {
     p.circle_filled(c, 6.0, t.handle_fill);
     p.add(egui::Shape::Path(egui::epaint::PathShape {
diff --git a/crates/ui-egui/src/control.rs b/crates/ui-egui/src/control.rs
index d344d912..2672c37d 100644
--- a/crates/ui-egui/src/control.rs
+++ b/crates/ui-egui/src/control.rs
@@ -3,8 +3,8 @@
 //! Methods (JSON lines over the host's transport, see `docs/control-protocol.md`):
 //! - `engine.execute {command, params}` / `ui.menu.invoke {command, params}`: run any command (engine or UI)
 //! - `engine.commands`: engine + UI commands with enablement; `document.inspect`; `ui.inspect`
-//! - `ui.pointer {events:[{kind: down|drag|up|move|doubleclick, x, y}], mods}`: drive the active tool in
-//!   slide points (same path as the mouse)
+//! - `ui.pointer {events:[{kind: down|drag|up|move|doubleclick, x, y, pressure?}], mods}`: drive the active tool in
+//!   slide points (same path as the mouse; `pressure` is `0..=1` when a pen reported one)
 //! - `ui.key {key, shift?, alt?, cmd?}` / `ui.text {text}`: keyboard through the engine
 //! - `ui.tool.select {tool, preset?}`
 //! - `ui.click {x, y, button?, count?}` / `ui.move {x, y}` / `ui.drag {x, y, toX, toY, steps?}`: real egui pointer
@@ -125,7 +125,8 @@ pub fn handle(app: &mut SlideApp, ctx: &egui::Context, req: &ControlRequest) ->
                     return err("pointer events need x and y");
                 };
                 let mods = e.get("mods").map(mods_from).unwrap_or(base);
-                match app.session.pointer(PointerEvent { kind, x, y, mods, tol: (4.0 / app.canvas_scale.max(0.05)) as f64 }) {
+                let pressure = e.get("pressure").and_then(Value::as_f64).map(|v| v as f32);
+                match app.session.pointer(PointerEvent { kind, x, y, mods, tol: (4.0 / app.canvas_scale.max(0.05)) as f64, pressure }) {
                     Ok(v) => last = v,
                     Err(e) => return err(e),
                 }
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 07741fde..7db87ec9 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -17,7 +17,7 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `document.inspect` | — | Slides, sections, layouts, shapes, selection |
 | `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state, documents, perf (fps, render ms) |
 | `ui.tool.select` | `{tool, preset?}` | `select`, `text`, `shape` + preset, any preset name, `curve`, `freeform`, `scribble`, `pen`, `highlighter`, `eraser` |
-| `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
+| `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?, pressure?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse. `pressure` is `0..=1` for a pen; omit it for a mouse |
 | `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show) |
 | `ui.ime` | `{preedit, active?: [start, end]}` / `{commit}` | An input method's composition through egui, as a real one arrives: shown in place on the slide or in a focused field; `{"preedit": ""}` cancels |
 | `ui.move` / `ui.click` / `ui.drag` | screen points | Real egui pointer input — reaches every widget, menu and pane |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..ccbe7e95 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (pen pressure scales ink width; tilt, pinch and trackpad gestures remain; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -217,7 +217,7 @@ Detail in [hardware-parity.md](hardware-parity.md).
   or wgpu path).
 - **Software-only video decode**; PowerPoint uses VideoToolbox/Media Foundation. 8–14 h (copy
   FilmCraft's hardware decode).
-- **No pen pressure or tilt for ink**; no pinch-zoom or trackpad gestures. 3–6 h.
+- **Pen pressure scales ink width** when the pointer reports it (a mouse or a missing reading stays at the pen width; a stroke saved as a flat `0.5` still draws at the pen width). Tilt is not read. No pinch-zoom or other trackpad gestures. 2–4 h.
 
 ## Localization
 
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Pen pressure scales ink width when the pointer reports it; tilt, pinch-zoom and other trackpad gestures remain |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/hardware-parity.md b/docs/hardware-parity.md
index 5ba34cfc..2ebbfa20 100644
--- a/docs/hardware-parity.md
+++ b/docs/hardware-parity.md
@@ -1,6 +1,6 @@
 # Hardware parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (pen pressure scales ink width; tilt remains; previous: minor, IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 
 What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
 ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -44,7 +44,7 @@ because it mostly follows from hardware use.
 | Keyboard and presentation clickers (Page Up/Down, B, Esc) | yes | yes |
 | Mouse and trackpad scroll | yes | yes |
 | Pinch to zoom, two-finger gestures | yes | no |
-| Pen pressure and tilt for ink (Apple Pencil via Sidecar, Windows Ink) | yes | no: ink strokes have constant width |
+| Pen pressure and tilt for ink (Apple Pencil via Sidecar, Windows Ink) | yes | pressure scales the stroke when the pointer reports it (a mouse or a missing reading draws at the pen width); tilt is not read |
 | Touch screens (Windows) | yes | basic pointer only |
 | IME input methods for CJK text | yes | yes: composed in place, underlined, candidate window at the caret (#101) |
 | Dictation | yes (macOS) | no |
@@ -63,13 +63,14 @@ outlines every frame (#67, fix open), and the decoders run in software.
 | GPU slide rasterization (vello's GPU/hybrid path) | 12–20 |
 | Hardware video decode (copy FilmCraft's VideoToolbox / Media Foundation / VA-API paths) | 8–14 |
 | Windows GPU startup robustness: backend probing, software fallback (#40, #59) | 4–8 (counted under Stability) |
-| Pen pressure, pinch zoom | 3–6 |
+| Pen tilt, pinch zoom, trackpad gestures | 2–5 |
 | Benchmark suite (`cargo xtask bench`) and a first performance pass | 6–12 (Performance dimension) |
-| **Hardware total** | **~26–45** |
+| **Hardware total** | **~25–44** |
 
 ## Revision history
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Pen pressure scales ink width; tilt, pinch zoom and trackpad gestures remain (estimate 3–6 h → 2–5 h) |
 | 2026-10-12 | minor | IME input methods (#101) |
 | 2026-10-10 | major | Created: rendering, media, displays, input and performance against PowerPoint 16.113 |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..b8f3e986 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (after beta: pen pressure scales ink width, tilt remains; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -60,9 +60,10 @@ reference renders, a Windows tester with the affected GPUs, native speakers to r
 
 SmartArt editing, chartex chart types, the remaining animation effects and motion paths, Notes and
 Handout masters, edit points, text warp and 3-D, proofing dictionaries, Zoom, recording, video and
-GIF export, legacy `.ppt` import and `.odp` (owner decision), GPU rasterization and hardware video
-decode, the other 21 languages with RTL mirroring, a larger original template gallery, and local AI
-features (owner decision on models). Itemized with hours in [gaps.md](gaps.md).
+GIF export, legacy `.ppt` import and `.odp` (owner decision), GPU rasterization, hardware video
+decode, pen tilt (pressure already scales ink width) and pinch zoom, the other 21 languages with
+RTL mirroring, a larger original template gallery, and local AI features (owner decision on
+models). Itemized with hours in [gaps.md](gaps.md).
 
 ## Milestones
 
@@ -109,5 +110,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | After beta: pen pressure scales ink width; tilt and pinch zoom remain |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..3fa6283e 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (pen pressure scales ink; percentages unchanged; previous: minor, hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -69,7 +69,7 @@ The weights are what those users actually depend on, written down so the total c
 | UI/UX fidelity | 15% | ~60% | 30–50 | [ui-parity.md](ui-parity.md) | All 10 ribbon tabs and the contextual tabs exist; Format Shape pane, Animation Pane, dialogs and menus are thinner than PowerPoint's; no native macOS menu bar; user reports #17, #71, #73, #76 |
 | Stability | 10% | ~60% | 10–20 | [gaps.md](gaps.md) | Never-crash rules, a panic guard round every command, PPTX fuzz/malformed tests. But startup crashes on some Windows GPUs (#40, #59) and Close discards edits without asking (#60) |
 | Performance | 5% | ~55% | 10–20 | [hardware-parity.md](hardware-parity.md) | Unmeasured against PowerPoint. Slides rasterize on the CPU (`vello_cpu`); Morph re-aligns outlines every frame (#67) |
-| Hardware | 5% | ~40% | 25–45 | [hardware-parity.md](hardware-parity.md) | GPU-composited window (wgpu), but CPU slide raster, software-only video decode, presenter view not placed on the second display, no pen pressure, no pinch zoom |
+| Hardware | 5% | ~40% | 25–45 | [hardware-parity.md](hardware-parity.md) | GPU-composited window (wgpu), but CPU slide raster, software-only video decode, presenter view not placed on the second display, no pen tilt, no pinch zoom |
 | Platforms | 5% | ~80% | 5–10 | [ROADMAP.md](../ROADMAP.md) | Ahead in reach: macOS, Windows x64/x86/arm64, Linux (5 formats), FreeBSD and the web, all from one release workflow. Held back by the Windows GPU crashes and Linux/Windows clipboard gaps |
 | Localization | 5% | ~8% | 55–90 + native review | [localization-parity.md](localization-parity.md) | English only; no string catalog. PowerPoint for Mac ships 26 languages. Bidi and Arabic shaping in slide text exist |
 | Ecosystem (templates, add-ins) | 3% | ~25% | 10–20 | [gaps.md](gaps.md) | 8 original themes vs PowerPoint's large template gallery; no add-ins or VBA (out of scope by policy) |
@@ -197,7 +197,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Animations | 6 | 79% | ~65% | 10–16 | 64 of PowerPoint's ~190 effects, Animation Pane timeline, preview, rewind lost on save (#77) | [animation-parity.md](animation-parity.md) |
 | Slide show and presenter view | 8 | 66% | ~60% | 10–16 | Second-display placement, laser pointer, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
 | Review | 3 | 60% | ~45% | 8–14 | Modern comment threads on round trip (#70), compare, version history, real spelling dictionaries | [file-format-parity.md](file-format-parity.md) |
-| Draw (ink) | 2 | 33% | ~30% | 5–9 | Pen pressure, ink to shape/text/math, lasso | [hardware-parity.md](hardware-parity.md) |
+| Draw (ink) | 2 | 33% | ~30% | 5–9 | Pen tilt, ink to shape/text/math, lasso | [hardware-parity.md](hardware-parity.md) |
 | Undo and clipboard | 3 | 88% | ~75% | 3–5 | Paste Special, image paste (#53) | [ui-parity.md](ui-parity.md) |
 | Automation ✱ | — | 100% | ahead | 0 | | [mcp.md](mcp.md) |
 | Platforms ✱ | — | 67% | ~80% | see platforms | | [ROADMAP.md](../ROADMAP.md) |
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Draw and hardware blurbs: pen pressure scales ink width when reported; percentages and hour ranges unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |

From 6f19e0bd07102f243876d7abad6a0066fe831137 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 01:56:36 +0300
Subject: [PATCH 227/376] SmartArt: shrink text to fit, picture layouts, 3-D
 styles and more colours

Each shape's text shrinks so its longest word fits on a line (the pyramid tip no longer breaks words). Three picture layouts (Vertical Picture List, Picture Caption List, Picture Accent Process) with a picture placeholder per node and smartArt.picture to fill it. Five 3-D SmartArt Styles (Polished, Inset, Cartoon, Powder, Brick Scene) drawn with lit bevels, and Colorful Range and Gradient Range colours; all written to and read from the .pptx quickStyle and colors parts.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/smartart.rs | 264 ++++++++++++++++++++++++++++--
 crates/engine/src/tests.rs        |  45 +++++
 crates/model/src/lib.rs           |   3 +
 crates/pptx/src/dgm.rs            | 120 ++++++++++++--
 crates/ui-egui/src/lib.rs         |  22 ++-
 crates/ui-egui/src/ribbon.rs      |  14 ++
 6 files changed, 431 insertions(+), 37 deletions(-)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index c4905a2b..b26d0308 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -23,7 +23,7 @@ pub const MAX_LEVEL: u8 = 8;
 const MAX_SHAPES: usize = 40;
 
 /// DeckCraft's layouts, with the names PowerPoint's gallery gives them.
-pub const LAYOUTS: [(&str, &str); 15] = [
+pub const LAYOUTS: [(&str, &str); 18] = [
     ("list", "Vertical Bullet List"),
     ("blockList", "Basic Block List"),
     ("hBulletList", "Horizontal Bullet List"),
@@ -39,19 +39,41 @@ pub const LAYOUTS: [(&str, &str); 15] = [
     ("invertedPyramid", "Inverted Pyramid"),
     ("matrix", "Basic Matrix"),
     ("titledMatrix", "Titled Matrix"),
+    ("pictureList", "Vertical Picture List"),
+    ("pictureCaption", "Picture Caption List"),
+    ("pictureProcess", "Picture Accent Process"),
 ];
 /// SmartArt Styles.
-pub const STYLES: [(&str, &str); 4] =
-    [("flat", "Simple Fill"), ("subtle", "Subtle Effect"), ("intense", "Intense Effect"), ("outline", "White Outline")];
+pub const STYLES: [(&str, &str); 9] = [
+    ("flat", "Simple Fill"),
+    ("subtle", "Subtle Effect"),
+    ("intense", "Intense Effect"),
+    ("outline", "White Outline"),
+    ("polished", "Polished"),
+    ("inset", "Inset"),
+    ("cartoon", "Cartoon"),
+    ("powder", "Powder"),
+    ("brick", "Brick Scene"),
+];
 /// Change Colors.
-pub const COLORS: [(&str, &str); 7] = [
+pub const COLORS: [(&str, &str); 17] = [
     ("colorful", "Colorful"),
+    ("range23", "Colorful Range - Accent Colors 2 to 3"),
+    ("range34", "Colorful Range - Accent Colors 3 to 4"),
+    ("range45", "Colorful Range - Accent Colors 4 to 5"),
+    ("range56", "Colorful Range - Accent Colors 5 to 6"),
     ("accent1", "Accent 1"),
     ("accent2", "Accent 2"),
     ("accent3", "Accent 3"),
     ("accent4", "Accent 4"),
     ("accent5", "Accent 5"),
     ("accent6", "Accent 6"),
+    ("accent1Grad", "Gradient Range - Accent 1"),
+    ("accent2Grad", "Gradient Range - Accent 2"),
+    ("accent3Grad", "Gradient Range - Accent 3"),
+    ("accent4Grad", "Gradient Range - Accent 4"),
+    ("accent5Grad", "Gradient Range - Accent 5"),
+    ("accent6Grad", "Gradient Range - Accent 6"),
 ];
 
 pub fn is_kind(k: &str) -> bool {
@@ -103,16 +125,25 @@ pub fn specs() -> Vec<CommandSpec> {
             "Change Layout",
             ["SmartArt Design", "Layouts"],
             None,
-            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix}",
+            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess}",
             has_selection,
             change_layout
         ),
+        cmd!(
+            "smartArt.picture",
+            "Insert Picture in SmartArt",
+            ["SmartArt Design", "Create Graphic"],
+            None,
+            "{id?, index, data?: base64 | path?: string | reset?: bool} (the node's picture placeholder in picture layouts)",
+            has_selection,
+            set_picture
+        ),
         cmd!(
             "smartArt.style",
             "SmartArt Styles",
             ["SmartArt Design", "SmartArt Styles"],
             None,
-            "{id?, style: flat|subtle|intense|outline}",
+            "{id?, style: flat|subtle|intense|outline|polished|inset|cartoon|powder|brick}",
             has_selection,
             change_style
         ),
@@ -121,7 +152,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Change Colors",
             ["SmartArt Design", "SmartArt Styles"],
             None,
-            "{id?, colors: colorful|accent1|…|accent6}",
+            "{id?, colors: colorful|range23|range34|range45|range56|accent1|…|accent6|accent1Grad|…|accent6Grad}",
             has_selection,
             change_colors
         ),
@@ -135,7 +166,7 @@ pub fn nodes_from_lines<'a>(lines: impl IntoIterator<Item = &'a str>) -> Vec<Dia
         .filter(|l| !l.trim().is_empty())
         .map(|l| {
             let tabs = l.chars().take_while(|c| *c == '\t').count();
-            DiagramNode { text: l.trim().to_string(), level: u8::try_from(tabs).unwrap_or(MAX_LEVEL).min(MAX_LEVEL) }
+            DiagramNode { text: l.trim().to_string(), level: u8::try_from(tabs).unwrap_or(MAX_LEVEL).min(MAX_LEVEL), picture: None }
         })
         .collect()
 }
@@ -167,7 +198,7 @@ fn subtree_end(nodes: &[DiagramNode], i: usize) -> usize {
 /// new node's index.
 pub fn add(nodes: &mut Vec<DiagramNode>, index: Option<usize>, position: &str, text: &str) -> usize {
     let Some(i) = index.filter(|i| *i < nodes.len()) else {
-        nodes.push(DiagramNode { text: text.into(), level: 0 });
+        nodes.push(DiagramNode { text: text.into(), level: 0, picture: None });
         return nodes.len() - 1;
     };
     let lv = nodes[i].level;
@@ -183,7 +214,7 @@ pub fn add(nodes: &mut Vec<DiagramNode>, index: Option<usize>, position: &str, t
         }
         _ => (subtree_end(nodes, i), lv),
     };
-    nodes.insert(at, DiagramNode { text: text.into(), level });
+    nodes.insert(at, DiagramNode { text: text.into(), level, picture: None });
     at
 }
 
@@ -272,19 +303,49 @@ fn slot(i: usize) -> SchemeSlot {
 /// The accent shape `i` is drawn in under Change Colors: `colorful` cycles the accents, `accentN`
 /// keeps one.
 fn accent(d: &Diagram, i: usize) -> SchemeSlot {
-    match d.colors.strip_prefix("accent").and_then(|n| n.parse::<usize>().ok()) {
+    let digit = |s: &str, k: usize| s.chars().nth(k).and_then(|c| c.to_digit(10)).map(|n| n as usize);
+    if let Some(r) = d.colors.strip_prefix("range")
+        && let Some(a @ 1..=6) = digit(r, 0)
+    {
+        // Colorful Range: alternate between two neighbouring accents.
+        return slot(a - 1 + i % 2);
+    }
+    match d.colors.strip_prefix("accent").and_then(|r| digit(r, 0)) {
         Some(n @ 1..=6) => slot(n - 1),
         _ => slot(i),
     }
 }
 
+/// Gradient Range: each shape a step darker than the one before (the steps cycle).
+fn shade(d: &Diagram, i: usize) -> Option<ColorTransform> {
+    d.colors.ends_with("Grad").then(|| ColorTransform::LumMod(100_000 - (i % 4) as i32 * 15_000))
+}
+
+/// The 3-D XML (`scene3d` + `sp3d`) for a 3-D SmartArt Style: a top bevel (`w`, `h` in points)
+/// lit by the three-point rig.
+fn three_d(bevel: &str, w: f64, h: f64) -> String {
+    format!(
+        "<a:scene3d><a:camera prst=\"orthographicFront\"/><a:lightRig rig=\"threePt\" dir=\"t\"/></a:scene3d><a:sp3d prstMaterial=\"matte\"><a:bevelT w=\"{}\" h=\"{}\" prst=\"{bevel}\"/></a:sp3d>",
+        (w * 12700.0).round() as i64,
+        (h * 12700.0).round() as i64
+    )
+}
+
+/// Whether `style` is one of the 3-D SmartArt Styles.
+pub fn is_3d(style: &str) -> bool {
+    matches!(style, "polished" | "inset" | "cartoon" | "powder" | "brick")
+}
+
 /// Fill, outline, text colour and effects for the SmartArt style. `light` shapes (the bullet
 /// boxes of the bullet lists) are a pale tint of the accent with dark text.
 fn paint(d: &Diagram, sh: &mut Shape, i: usize, light: bool) {
     let a = accent(d, i);
-    let base = ColorRef::scheme(a);
+    let base = match shade(d, i) {
+        Some(t) => ColorRef::scheme(a).with(t),
+        None => ColorRef::scheme(a),
+    };
     let tint = |pct: i32| ColorRef::scheme(a).with(ColorTransform::LumMod(100_000 - pct * 1000)).with(ColorTransform::LumOff(pct * 1000));
-    let dark_text = light || d.style == "outline";
+    let dark_text = light || matches!(d.style.as_str(), "outline" | "powder");
     sh.style = Some(ShapeStyle::accent(a));
     match d.style.as_str() {
         _ if light => {
@@ -300,6 +361,23 @@ fn paint(d: &Diagram, sh: &mut Shape, i: usize, light: bool) {
             sh.line = Some(Line::solid(ColorRef::scheme(SchemeSlot::Lt1), 1.5));
             sh.effects = Some(Effects { outer_shadow: Some(shadow(4.0, 3.0)), ..Default::default() });
         }
+        "polished" | "inset" | "cartoon" | "powder" | "brick" => {
+            let (bevel, bw, line, fill) = match d.style.as_str() {
+                "polished" => ("circle", 12.0, Some(Line::solid(ColorRef::scheme(SchemeSlot::Lt1), 0.75)), base.clone()),
+                "inset" => ("relaxedInset", 10.0, None, base.clone()),
+                "cartoon" => ("softRound", 8.0, Some(Line::solid(ColorRef::scheme(SchemeSlot::Tx1), 2.0)), base.clone()),
+                "powder" => ("convex", 14.0, None, tint(40)),
+                _ => ("slope", 6.0, Some(Line::solid(ColorRef::scheme(SchemeSlot::Lt1), 1.0)), base.clone()),
+            };
+            sh.fill = Some(Fill::solid(fill));
+            sh.line = Some(line.unwrap_or_else(|| Line { fill: Some(Fill::None), ..Default::default() }));
+            sh.effects = Some(Effects {
+                outer_shadow: (d.style != "inset").then(|| shadow(6.0, 4.0)),
+                bevel: Some(bevel.into()),
+                raw3d: Some(three_d(bevel, bw, bw * 0.6)),
+                ..Default::default()
+            });
+        }
         "intense" => {
             sh.fill = Some(Fill::Gradient(Gradient {
                 stops: vec![
@@ -403,8 +481,73 @@ pub fn layout(d: &Diagram, area: Xfrm) -> Vec<Shape> {
     layout_items(d, area).into_iter().map(|(s, _)| s).collect()
 }
 
-/// Lay out `d`, painted with its style and colours, each shape with the nodes it shows.
+/// Lay out `d`, painted with its style and colours, each shape with the nodes it shows; text is
+/// shrunk per shape so its longest word fits on a line.
 fn layout_items(d: &Diagram, area: Xfrm) -> Vec<Item> {
+    let mut v = layout_raw(d, area);
+    for (sh, _) in &mut v {
+        fit_words(sh);
+    }
+    v
+}
+
+/// Rough advance of a character as a fraction of the font size (a sans text face).
+const CHAR_W: f64 = 0.6;
+/// Smallest font scale shrinking to fit goes to.
+const MIN_SCALE: f64 = 0.25;
+
+/// Shrink the shape's text (all paragraphs together, as PowerPoint's per-shape font size does) so
+/// no word is wider than its line and would break mid-word. Overflow in height is left to the
+/// body's shrink-on-overflow autofit.
+fn fit_words(sh: &mut Shape) {
+    let Some(w) = sh.xfrm.map(|x| x.w) else { return };
+    let Some(body) = &mut sh.text else { return };
+    let avail = w - body.body.inset_l.unwrap_or(7.2) - body.body.inset_r.unwrap_or(7.2);
+    let mut scale: f64 = 1.0;
+    for p in &body.paragraphs {
+        let line = avail - p.props.margin_left.unwrap_or(0.0).max(0.0);
+        for r in &p.runs {
+            let size = r.props.size.unwrap_or(18.0);
+            let word = r.text.split_whitespace().map(|t| t.chars().count()).max().unwrap_or(0) as f64;
+            let need = word * size * CHAR_W;
+            if need > 0.0 {
+                scale = scale.min(line.max(0.0) / need);
+            }
+        }
+    }
+    let scale = scale.max(MIN_SCALE);
+    if scale >= 0.999 {
+        return;
+    }
+    let shrink = |v: &mut Option<f64>| {
+        if let Some(x) = v {
+            *x = (*x * scale * 2.0).floor() / 2.0;
+        }
+    };
+    for p in &mut body.paragraphs {
+        for r in &mut p.runs {
+            shrink(&mut r.props.size);
+        }
+        shrink(&mut p.end_props.size);
+        shrink(&mut p.props.margin_left);
+        if let Some(i) = &mut p.props.indent {
+            *i *= scale;
+        }
+    }
+}
+
+/// A picture placeholder for node `node`: its picture when it has one, else a pale box.
+fn picture_shape(d: &Diagram, preset: &str, x: Xfrm, i: usize, node: usize) -> Shape {
+    let mut sh = Shape { name: "SmartArt picture".into(), xfrm: Some(x), geom: Geom::preset(preset), ..Default::default() };
+    paint(d, &mut sh, i, true);
+    if let Some(m) = d.nodes.get(node).and_then(|n| n.picture) {
+        sh.fill = Some(Fill::Picture(deckcraft_model::style::PictureFill { media: m, ..Default::default() }));
+        sh.line = Some(Line::solid(ColorRef::scheme(SchemeSlot::Lt1), 1.5));
+    }
+    sh
+}
+
+fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
     let gs = groups(d);
     let nodes = |g: &[usize]| -> Vec<&DiagramNode> { g.iter().filter_map(|i| d.nodes.get(*i)).collect() };
     let n = gs.len().max(1);
@@ -564,10 +707,15 @@ fn layout_items(d: &Diagram, area: Xfrm) -> Vec<Item> {
                     paths: vec![deckcraft_model::CustomPath { w, h: bh, d: path, fill: deckcraft_geom::preset::FillMode::Norm, stroke: true }],
                 };
                 // Keep the text inside the sloped sides: inset it to a bit past the band's mid width.
-                let inset = ((it + ib) / 2.0 + (it - ib).abs() / 4.0 + 4.0).min(w * 0.2);
+                // The tip band is a triangle: its text sits at the wide end, inset to the width there.
+                let tip = wt.min(wb) < 1e-6;
+                let inset = if tip { w * 0.22 } else { (it + ib) / 2.0 + (it - ib).abs() / 4.0 + 4.0 };
                 if let Some(b) = &mut sh.text {
                     b.body.inset_l = Some(inset);
                     b.body.inset_r = Some(inset);
+                    if tip {
+                        b.body.anchor = Some(if inverted { deckcraft_model::text::Anchor::Top } else { deckcraft_model::text::Anchor::Bottom });
+                    }
                 }
                 paint(d, &mut sh, i, false);
                 out.push((sh, g.clone()));
@@ -590,6 +738,46 @@ fn layout_items(d: &Diagram, area: Xfrm) -> Vec<Item> {
                 out.push((sh, t.clone()));
             }
         }
+        "pictureList" => {
+            // Vertical Picture List: a picture square at the left of each row, the text beside it.
+            let h = area.h / nf;
+            let bh = h * 0.88;
+            for (i, g) in gs.iter().enumerate() {
+                let y = area.y + i as f64 * h;
+                let s = bh.min(area.w * 0.3);
+                out.push((picture_shape(d, "rect", Xfrm::new(area.x, y, s, bh), i, g[0]), vec![]));
+                titled(&mut out, "roundRect", Xfrm::new(area.x + s + bh * 0.08, y, (area.w - s - bh * 0.08).max(1.0), bh), i, g);
+            }
+        }
+        "pictureCaption" | "pictureProcess" => {
+            // Picture Caption List: a picture over each caption, in rows. Picture Accent Process: one
+            // row, arrows between the steps.
+            let process = d.kind == "pictureProcess";
+            let cols = if process { n } else { ((nf * area.w / area.h.max(1.0) / 1.2).sqrt().ceil() as usize).clamp(1, n) };
+            let rows = n.div_ceil(cols);
+            let gap = if process { area.w * 0.05 } else { 0.0 };
+            let w = (area.w - gap * (cols as f64 - 1.0)) / cols as f64;
+            let h = area.h / rows as f64;
+            let bw = if process { w } else { w * 0.9 };
+            let ch = (h * 0.9).min(bw * 1.1);
+            for (i, g) in gs.iter().enumerate() {
+                let (c, r) = (i % cols, i / cols);
+                let in_row = if r + 1 == rows { n - r * cols } else { cols };
+                let x0 = area.x + (area.w - in_row as f64 * w - gap * (in_row as f64 - 1.0)) / 2.0;
+                let x = x0 + c as f64 * (w + gap) + (w - bw) / 2.0;
+                let y = area.y + r as f64 * h + (h - ch) / 2.0;
+                let ph = ch * 0.62;
+                out.push((
+                    picture_shape(d, if process { "ellipse" } else { "rect" }, Xfrm::new(x + (bw - ph.min(bw)) / 2.0, y, ph.min(bw), ph), i, g[0]),
+                    vec![],
+                ));
+                titled(&mut out, if process { "roundRect" } else { "rect" }, Xfrm::new(x, y + ph + ch * 0.03, bw, ch * 0.35), i, g);
+                if process && i + 1 < n {
+                    let a = (gap * 0.7).min(ch * 0.2);
+                    arrow(&mut out, Xfrm::new(x + bw + (gap - a) / 2.0, y + ph / 2.0 - a / 2.0, a, a), 0.0, i);
+                }
+            }
+        }
         _ => {}
     }
     out
@@ -751,7 +939,7 @@ fn index(p: &Value, cmd: &str) -> Result<usize> {
 pub fn insert(s: &mut Session, kind: &str, mut nodes: Vec<DiagramNode>) -> Result<Value> {
     let kind = if is_kind(kind) { kind } else { "process" };
     if nodes.is_empty() {
-        nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0 }).collect();
+        nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0, picture: None }).collect();
     }
     normalize(&mut nodes);
     let d = Diagram { kind: kind.into(), nodes, ..Default::default() };
@@ -834,6 +1022,26 @@ fn demote(s: &mut Session, p: &Value) -> Result<Value> {
     edit_diagram(s, p, CMD, |d| if demote_node(&mut d.nodes, i) { Ok(Value::Null) } else { Err(bad(CMD, "nothing above to demote under")) })
 }
 
+fn set_picture(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.picture";
+    let i = index(p, CMD)?;
+    let media = if bool_or(p, "reset", false) {
+        None
+    } else {
+        let (name, bytes) = super::insert::media_bytes(p, CMD)?;
+        let ct = super::insert::content_type(&name, &bytes);
+        target_group(s, p, CMD)?;
+        Some(s.edit(|doc, _| Ok(doc.add_media(&name, ct, bytes)))?)
+    };
+    edit_diagram(s, p, CMD, |d| {
+        // A sub-point's picture is its top-level node's: that's the node the placeholder shows.
+        let top = (0..=i.min(d.nodes.len().saturating_sub(1))).rev().find(|k| d.nodes.get(*k).is_some_and(|n| n.level == 0)).unwrap_or(i);
+        let n = d.nodes.get_mut(top).ok_or_else(|| bad(CMD, "no such node"))?;
+        n.picture = media;
+        Ok(Value::Null)
+    })
+}
+
 fn change_style(s: &mut Session, p: &Value) -> Result<Value> {
     const CMD: &str = "smartArt.style";
     let v = str_param(p, "style").filter(|k| STYLES.iter().any(|(id, _)| id == k)).ok_or_else(|| bad(CMD, "unknown style"))?.to_string();
@@ -880,7 +1088,7 @@ mod tests {
         n.iter().map(|x| x.level).collect()
     }
     fn mk(levels: &[u8]) -> Vec<DiagramNode> {
-        levels.iter().enumerate().map(|(i, l)| DiagramNode { text: format!("n{i}"), level: *l }).collect()
+        levels.iter().enumerate().map(|(i, l)| DiagramNode { text: format!("n{i}"), level: *l, picture: None }).collect()
     }
 
     #[test]
@@ -934,7 +1142,7 @@ mod tests {
     fn every_layout_shows_every_node_inside_its_area() {
         let area = Xfrm::new(50.0, 40.0, 800.0, 400.0);
         for (kind, _) in LAYOUTS {
-            for style in ["", "subtle", "intense", "outline"] {
+            for style in std::iter::once("").chain(STYLES.iter().map(|(k, _)| *k)) {
                 let d = Diagram {
                     kind: kind.into(),
                     nodes: mk(&[0, 1, 0, 0, 1, 0]),
@@ -956,4 +1164,24 @@ mod tests {
             }
         }
     }
+
+    #[test]
+    fn long_words_shrink_to_fit_their_shape() {
+        let d = Diagram { kind: "pyramid".into(), nodes: nodes_from_lines(["Internationalisation", "Build", "Test"]), ..Default::default() };
+        let items = layout_items(&d, Xfrm::new(0.0, 0.0, 600.0, 300.0));
+        let size = |k: usize| items[k].0.text.as_ref().and_then(|b| b.paragraphs[0].runs[0].props.size).unwrap_or(0.0);
+        assert!(size(0) < 20.0 && size(0) >= 20.0 * MIN_SCALE - 0.5, "the tip's long word shrinks: {}", size(0));
+        assert!((size(1) - 20.0).abs() < 1e-9, "short words keep their size");
+    }
+
+    #[test]
+    fn colour_variants_pick_accents() {
+        let d = |c: &str| Diagram { colors: c.into(), ..Default::default() };
+        assert_eq!(
+            (accent(&d("range45"), 0), accent(&d("range45"), 1), accent(&d("range45"), 2)),
+            (SchemeSlot::Accent4, SchemeSlot::Accent5, SchemeSlot::Accent4)
+        );
+        assert_eq!(accent(&d("accent3Grad"), 4), SchemeSlot::Accent3);
+        assert!(shade(&d("accent3Grad"), 1).is_some() && shade(&d("accent3"), 1).is_none());
+    }
 }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 64b0942c..f66f84fe 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -925,3 +925,48 @@ fn smartart_round_trips_through_pptx_as_a_diagram() {
     let d = again.slides[1].shapes.iter().find_map(|x| x.diagram.clone()).unwrap();
     assert_eq!(d.nodes.last().map(|n| (n.text.as_str(), n.level)), Some(("COO", 1)));
 }
+
+#[test]
+fn smartart_pictures_3d_styles_and_colour_variants() {
+    let mut s = session();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.smartArt", &json!({"kind": "pictureCaption", "items": ["Lakes", "\tBlue", "Hills"]})).unwrap();
+    let pics = |s: &Session| -> Vec<deckcraft_model::Shape> {
+        let st = s.doc().unwrap();
+        let g = st.doc.slides[1].shapes.iter().find(|x| x.diagram.is_some()).unwrap().clone();
+        g.children().iter().filter(|c| c.name == "SmartArt picture").cloned().collect()
+    };
+    assert_eq!(pics(&s).len(), 2, "one picture placeholder per top-level node");
+    assert!(pics(&s).iter().all(|p| !matches!(p.fill, Some(deckcraft_model::Fill::Picture(_)))));
+    // A 1×1 PNG put in through a sub-point lands in its top-level node.
+    let png = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==";
+    s.execute("smartArt.picture", &json!({"index": 1, "name": "p.png", "data": png})).unwrap();
+    let p = pics(&s);
+    assert!(matches!(p[0].fill, Some(deckcraft_model::Fill::Picture(_))));
+    assert!(!matches!(p[1].fill, Some(deckcraft_model::Fill::Picture(_))));
+    // Text edits keep the picture; reset removes it.
+    s.execute("smartArt.addNode", &json!({"text": "Woods"})).unwrap();
+    assert!(matches!(pics(&s)[0].fill, Some(deckcraft_model::Fill::Picture(_))));
+    assert_eq!(pics(&s).len(), 3);
+    // The picture is written to the .pptx drawing.
+    let bytes = deckcraft_pptx::export(s.doc().unwrap().doc.as_ref()).unwrap();
+    let back = deckcraft_pptx::import(&bytes).unwrap();
+    assert!(back.validate().is_empty());
+    assert_eq!(back.slides[1].shapes.iter().find_map(|x| x.diagram.as_ref()).map(|d| d.kind.clone()).as_deref(), Some("pictureCaption"));
+    s.execute("smartArt.picture", &json!({"index": 0, "reset": true})).unwrap();
+    assert!(pics(&s).iter().all(|p| !matches!(p.fill, Some(deckcraft_model::Fill::Picture(_)))));
+
+    // 3-D styles carry a lit bevel; colour variants round trip through .pptx.
+    s.execute("smartArt.style", &json!({"style": "cartoon"})).unwrap();
+    let st = s.doc().unwrap();
+    let g = st.doc.slides[1].shapes.iter().find(|x| x.diagram.is_some()).unwrap().clone();
+    let raw = g.children().iter().find_map(|c| c.effects.as_ref().and_then(|e| e.raw3d.clone())).expect("3-D XML");
+    assert!(raw.contains("scene3d") && raw.contains("softRound"));
+    for (style, colors) in [("polished", "range34"), ("powder", "accent5Grad"), ("brick", "accent2")] {
+        s.execute("smartArt.style", &json!({"style": style})).unwrap();
+        s.execute("smartArt.colors", &json!({"colors": colors})).unwrap();
+        let back = deckcraft_pptx::import(&deckcraft_pptx::export(s.doc().unwrap().doc.as_ref()).unwrap()).unwrap();
+        let d = back.slides[1].shapes.iter().find_map(|x| x.diagram.clone()).unwrap();
+        assert_eq!((d.style.as_str(), d.colors.as_str()), (style, colors));
+    }
+}
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index cfd30ab1..0d1afb9c 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -362,6 +362,9 @@ pub struct Diagram {
 pub struct DiagramNode {
     pub text: String,
     pub level: u8,
+    /// The picture shown in the node's picture placeholder (picture layouts).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub picture: Option<MediaId>,
 }
 
 impl Default for Shape {
diff --git a/crates/pptx/src/dgm.rs b/crates/pptx/src/dgm.rs
index 993c771f..e748da3e 100644
--- a/crates/pptx/src/dgm.rs
+++ b/crates/pptx/src/dgm.rs
@@ -28,6 +28,11 @@ pub fn qs_id(style: &str) -> String {
         "subtle" => "simple3",
         "intense" => "simple5",
         "outline" => "simple4",
+        "polished" => "3d1",
+        "inset" => "3d2",
+        "cartoon" => "3d3",
+        "powder" => "3d4",
+        "brick" => "3d5",
         _ => "simple1",
     };
     format!("{QS_BASE}{s}")
@@ -38,6 +43,11 @@ pub fn style_for(qs: &str) -> &'static str {
     match qs.rsplit('/').next().unwrap_or("") {
         "simple1" | "" => "",
         "simple4" => "outline",
+        "3d1" => "polished",
+        "3d2" => "inset",
+        "3d3" => "cartoon",
+        "3d4" => "powder",
+        "3d5" => "brick",
         "simple2" | "simple3" => "subtle",
         _ => "intense",
     }
@@ -45,17 +55,37 @@ pub fn style_for(qs: &str) -> &'static str {
 
 /// PowerPoint's colour definition for Change Colors.
 pub fn cs_id(colors: &str) -> String {
-    match colors.strip_prefix("accent").and_then(|n| n.parse::<u8>().ok()) {
-        Some(n @ 1..=6) => format!("{CS_BASE}accent{n}_2"),
+    if let Some(a @ 2..=5) = colors.strip_prefix("range").and_then(|r| r.get(..1)).and_then(|n| n.parse::<u8>().ok()) {
+        return format!("{CS_BASE}colorful{a}");
+    }
+    let grad = colors.ends_with("Grad");
+    match colors.strip_prefix("accent").and_then(|r| r.get(..1)).and_then(|n| n.parse::<u8>().ok()) {
+        Some(n @ 1..=6) => format!("{CS_BASE}accent{n}_{}", if grad { 3 } else { 2 }),
         _ => format!("{CS_BASE}colorful1"),
     }
 }
 
+/// The accents a Change Colors choice fills shapes with, in turn.
+fn fill_accents(colors: &str) -> Vec<String> {
+    if let Some(a @ 2..=5) = colors.strip_prefix("range").and_then(|r| r.get(..1)).and_then(|n| n.parse::<u8>().ok()) {
+        return vec![format!("accent{a}"), format!("accent{}", a + 1)];
+    }
+    match colors.strip_prefix("accent").and_then(|r| r.get(..1)).and_then(|n| n.parse::<u8>().ok()) {
+        Some(n @ 1..=6) => vec![format!("accent{n}")],
+        _ => (1..=6).map(|k| format!("accent{k}")).collect(),
+    }
+}
+
 /// Change Colors from a colour definition id: `accentN_…` keeps accent N, anything else is colourful.
 pub fn colors_for(cs: &str) -> String {
     let last = cs.rsplit('/').next().unwrap_or("");
-    match last.strip_prefix("accent").and_then(|r| r.split('_').next()).and_then(|n| n.parse::<u8>().ok()) {
-        Some(n @ 1..=6) => format!("accent{n}"),
+    if let Some(a @ 2..=5) = last.strip_prefix("colorful").and_then(|n| n.parse::<u8>().ok()) {
+        return format!("range{a}{}", a + 1);
+    }
+    let mut parts = last.strip_prefix("accent").unwrap_or("").split('_');
+    match (parts.next().and_then(|n| n.parse::<u8>().ok()), parts.next()) {
+        (Some(n @ 1..=6), Some("3" | "4" | "5")) => format!("accent{n}Grad"),
+        (Some(n @ 1..=6), _) => format!("accent{n}"),
         _ => String::new(),
     }
 }
@@ -79,6 +109,9 @@ pub fn layout_id(kind: &str) -> &'static str {
         "invertedPyramid" => "urn:microsoft.com/office/officeart/2005/8/layout/pyramid3",
         "matrix" => "urn:microsoft.com/office/officeart/2005/8/layout/matrix3",
         "titledMatrix" => "urn:microsoft.com/office/officeart/2005/8/layout/matrix1",
+        "pictureList" => "urn:microsoft.com/office/officeart/2005/8/layout/vList4",
+        "pictureCaption" => "urn:microsoft.com/office/officeart/2005/8/layout/pList1",
+        "pictureProcess" => "urn:microsoft.com/office/officeart/2005/8/layout/pList2",
         _ => "urn:microsoft.com/office/officeart/2005/8/layout/vList2",
     }
 }
@@ -102,6 +135,9 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         "invertedPyramid",
         "matrix",
         "titledMatrix",
+        "pictureList",
+        "pictureCaption",
+        "pictureProcess",
         "list",
     ] {
         if layout_id == layout_id_of(k) {
@@ -138,7 +174,7 @@ fn layout_id_of(kind: &str) -> &'static str {
 
 fn category(kind: &str) -> &'static str {
     match kind {
-        "process" | "chevron" | "verticalProcess" | "stepUp" => "process",
+        "process" | "chevron" | "verticalProcess" | "stepUp" | "pictureProcess" => "process",
         "cycle" | "blockCycle" | "radial" => "cycle",
         "hierarchy" => "hierarchy",
         "pyramid" | "invertedPyramid" => "pyramid",
@@ -288,7 +324,7 @@ pub fn outline(data: &El) -> Vec<DiagramNode> {
         if out.len() >= MAX_NODES || !seen.insert(id) {
             continue;
         }
-        out.push(DiagramNode { text: texts.get(id).cloned().unwrap_or_default(), level: level.min(8) });
+        out.push(DiagramNode { text: texts.get(id).cloned().unwrap_or_default(), level: level.min(8), picture: None });
         if let Some(v) = kids.get(id) {
             stack.extend(v.iter().rev().map(|(_, c)| (*c, level.saturating_add(1))));
         }
@@ -312,7 +348,7 @@ fn paragraphs(t: &El) -> String {
 /// The layout algorithm and node shape of a DeckCraft layout.
 fn alg(kind: &str) -> (&'static str, Vec<(&'static str, &'static str)>, &'static str) {
     match kind {
-        "process" | "stepUp" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "roundRect"),
+        "process" | "stepUp" | "pictureProcess" | "pictureCaption" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "roundRect"),
         "chevron" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "chevron"),
         "verticalProcess" => ("lin", vec![("linDir", "fromT"), ("nodeHorzAlign", "ctr")], "roundRect"),
         "cycle" | "radial" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse"),
@@ -450,6 +486,18 @@ pub fn layout_xml(kind: &str) -> Vec<u8> {
     w.finish()
 }
 
+/// The top bevel (preset, width in EMU) of a 3-D SmartArt Style.
+fn bevel(style: &str) -> Option<(&'static str, i64)> {
+    Some(match style {
+        "polished" => ("circle", 76200),
+        "inset" => ("relaxedInset", 63500),
+        "cartoon" => ("softRound", 50800),
+        "powder" => ("convex", 101600),
+        "brick" => ("slope", 50800),
+        _ => return None,
+    })
+}
+
 /// `ppt/diagrams/quickStyleN.xml`: flat shapes drawn from the theme's first styles.
 pub fn style_xml(style: &str) -> Vec<u8> {
     let mut w = W::new();
@@ -457,7 +505,7 @@ pub fn style_xml(style: &str) -> Vec<u8> {
     w.empty("dgm:title", A::new().a("val", ""));
     w.empty("dgm:desc", A::new().a("val", ""));
     w.open0("dgm:catLst");
-    w.empty("dgm:cat", A::new().a("type", "simple").a("pri", "10100"));
+    w.empty("dgm:cat", A::new().a("type", if bevel(style).is_some() { "3D" } else { "simple" }).a("pri", "10100"));
     w.close("dgm:catLst");
     w.open0("dgm:scene3d");
     w.empty("a:camera", A::new().a("prst", "orthographicFront"));
@@ -468,7 +516,14 @@ pub fn style_xml(style: &str) -> Vec<u8> {
     w.empty("a:camera", A::new().a("prst", "orthographicFront"));
     w.empty("a:lightRig", A::new().a("rig", "threePt").a("dir", "t"));
     w.close("dgm:scene3d");
-    w.empty0("dgm:sp3d");
+    match bevel(style) {
+        Some((prst, w_emu)) => {
+            w.open0("dgm:sp3d");
+            w.empty("a:bevelT", A::new().a("w", w_emu.to_string()).a("h", (w_emu * 3 / 5).to_string()).a("prst", prst));
+            w.close("dgm:sp3d");
+        }
+        None => w.empty0("dgm:sp3d"),
+    }
     w.empty("dgm:txPr", A::new());
     w.open0("dgm:style");
     for (tag, idx) in [("a:lnRef", "2"), ("a:fillRef", "1"), ("a:effectRef", "0")] {
@@ -491,19 +546,26 @@ pub fn colors_xml(colors: &str) -> Vec<u8> {
     w.open("dgm:colorsDef", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("uniqueId", cs_id(colors)));
     w.empty("dgm:title", A::new().a("val", ""));
     w.empty("dgm:desc", A::new().a("val", ""));
-    let single = colors.starts_with("accent");
+    let accents = fill_accents(colors);
+    let single = accents.len() == 1;
+    let cat = if single { accents.first().map(String::as_str).unwrap_or("accent1") } else { "colorful" };
     w.open0("dgm:catLst");
-    w.empty("dgm:cat", A::new().a("type", if single { colors } else { "colorful" }).a("pri", "11200"));
+    w.empty("dgm:cat", A::new().a("type", cat).a("pri", "11200"));
     w.close("dgm:catLst");
     w.open("dgm:styleLbl", A::new().a("name", "node1"));
-    if single {
+    if colors.ends_with("Grad") {
+        // Gradient Range: the accent shaded darker across the shapes.
         w.open("dgm:fillClrLst", A::new().a("meth", "repeat"));
-        w.empty("a:schemeClr", A::new().a("val", colors));
+        for k in 0..4 {
+            w.open("a:schemeClr", A::new().a("val", cat));
+            w.empty("a:lumMod", A::new().a("val", (100_000 - k * 15_000).to_string()));
+            w.close("a:schemeClr");
+        }
         w.close("dgm:fillClrLst");
     } else {
         w.open("dgm:fillClrLst", A::new().a("meth", "repeat"));
-        for k in 1..=6 {
-            w.empty("a:schemeClr", A::new().a("val", format!("accent{k}")));
+        for a in &accents {
+            w.empty("a:schemeClr", A::new().a("val", a.as_str()));
         }
         w.close("dgm:fillClrLst");
     }
@@ -524,7 +586,7 @@ mod tests {
     use super::*;
 
     fn nodes(v: &[(&str, u8)]) -> Vec<DiagramNode> {
-        v.iter().map(|(t, l)| DiagramNode { text: (*t).into(), level: *l }).collect()
+        v.iter().map(|(t, l)| DiagramNode { text: (*t).into(), level: *l, picture: None }).collect()
     }
 
     #[test]
@@ -536,11 +598,35 @@ mod tests {
         assert_eq!(outline(&doc.root), d.nodes);
         let s = String::from_utf8(xml).unwrap();
         assert!(s.contains("hierarchy1") && s.contains("relId=\"rId9\""));
-        for x in [layout_xml("hierarchy"), layout_xml("cycle"), style_xml("subtle"), colors_xml(""), colors_xml("accent3")] {
+        for x in [
+            layout_xml("hierarchy"),
+            layout_xml("cycle"),
+            style_xml("subtle"),
+            colors_xml(""),
+            colors_xml("accent3"),
+            style_xml("polished"),
+            colors_xml("range23"),
+            colors_xml("accent6Grad"),
+            layout_xml("pictureList"),
+        ] {
             assert!(crate::xml::parse(&x).is_ok());
         }
     }
 
+    #[test]
+    fn style_and_colour_ids_round_trip() {
+        for st in ["", "subtle", "intense", "outline", "polished", "inset", "cartoon", "powder", "brick"] {
+            assert_eq!(style_for(&qs_id(st)), st);
+        }
+        for c in ["", "range23", "range56", "accent1", "accent4Grad"] {
+            assert_eq!(colors_for(&cs_id(c)), c);
+        }
+        assert!(String::from_utf8(style_xml("cartoon")).unwrap().contains("bevelT"));
+        for k in ["pictureList", "pictureCaption", "pictureProcess"] {
+            assert_eq!(kind_for(layout_id(k), ""), k);
+        }
+    }
+
     #[test]
     fn hostile_links_are_bounded() {
         let xml = br#"<dgm:dataModel xmlns:dgm="d"><dgm:ptLst><dgm:pt modelId="0" type="doc"/><dgm:pt modelId="1"><dgm:t><a:p xmlns:a="a"><a:r><a:t>A</a:t></a:r></a:p></dgm:t></dgm:pt><dgm:pt modelId="2"/></dgm:ptLst><dgm:cxnLst><dgm:cxn srcId="0" destId="1"/><dgm:cxn srcId="1" destId="2"/><dgm:cxn srcId="2" destId="1"/><dgm:cxn type="presOf" srcId="0" destId="2"/></dgm:cxnLst></dgm:dataModel>"#;
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 6b2f0e33..0435923c 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -173,6 +173,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("app.preferences", "Preferences…", Some("Cmd+,"), "{}"),
     ("app.openDialog", "Open…", None, "{purpose?}"),
     ("app.insertPictureDialog", "Picture from File…", None, "{}"),
+    ("app.smartArtPictureDialog", "Insert Picture in SmartArt…", None, "{id?, index}"),
     ("app.insertAudioDialog", "Audio from File…", None, "{}"),
     ("app.insertVideoDialog", "Video from File…", None, "{}"),
     ("app.saveAsDialog", "Save As…", None, "{}"),
@@ -547,6 +548,12 @@ impl SlideApp {
             "app.preferences" => self.dialog = Some(dialogs::Dialog::new("preferences")),
             "app.openDialog" => self.pick_and_open(),
             "app.insertPictureDialog" => self.pick_and_insert("picture", "insert.picture"),
+            "app.smartArtPictureDialog" => {
+                if self.services.pick_open.is_none() {
+                    return Err("picking a SmartArt picture needs the desktop app".into());
+                }
+                self.pick_and_run("picture", "smartArt.picture", p);
+            }
             "app.insertAudioDialog" => self.pick_and_insert("audio", "insert.audio"),
             "app.insertVideoDialog" => self.pick_and_insert("video", "insert.video"),
             "app.saveAsDialog" => self.save_as_dialog("deckcraft"),
@@ -591,14 +598,25 @@ impl SlideApp {
     }
 
     fn pick_and_insert(&mut self, purpose: &str, cmd: &str) {
+        self.pick_and_run(purpose, cmd, &json!({}));
+    }
+
+    /// Pick a file and run `cmd` with it (`name` + `data`, or `path`) added to `extra`.
+    fn pick_and_run(&mut self, purpose: &str, cmd: &str, extra: &Value) {
         if let Some(pick) = self.services.pick_open.as_mut() {
             if let Some(path) = pick(purpose) {
+                let mut args = if extra.is_object() { extra.clone() } else { json!({}) };
                 let r = match self.services.read.as_ref().map(|r| r(&path)) {
                     Some(Ok(bytes)) => {
                         let name = std::path::Path::new(&path).file_name().map(|n| n.to_string_lossy().to_string()).unwrap_or_default();
-                        self.session.execute(cmd, &json!({"name": name, "data": deckcraft_engine::cmd::base64_encode(&bytes)}))
+                        args["name"] = json!(name);
+                        args["data"] = json!(deckcraft_engine::cmd::base64_encode(&bytes));
+                        self.session.execute(cmd, &args)
+                    }
+                    _ => {
+                        args["path"] = json!(path);
+                        self.session.execute(cmd, &args)
                     }
-                    _ => self.session.execute(cmd, &json!({"path": path})),
                 };
                 if let Err(e) = r {
                     self.set_status(e.to_string());
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index f1ca7499..66706d18 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2354,6 +2354,13 @@ fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
                 run(app, "smartArt.demote", json!({"id": gid, "index": at}));
             }
         });
+        let pictures = kind.starts_with("picture");
+        if small_button(ui, Icon::Picture, "Insert Picture", pictures && n > 0, false)
+            .on_hover_text("Put a picture in the selected node's picture placeholder")
+            .clicked()
+        {
+            run(app, "app.smartArtPictureDialog", json!({"id": gid, "index": at}));
+        }
     });
     group(ui, |ui| {
         let (r, _) = small_button_ex(ui, Icon::Layout, "Layouts", gid.is_some(), false, true);
@@ -2369,6 +2376,9 @@ fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
         let (r, _) = small_button_ex(ui, Icon::ChangeChartType, "Change Colors", gid.is_some(), false, true);
         egui::Popup::menu(&r).show(|ui| {
             for (k, label) in deckcraft_engine::cmd::smartart::COLORS {
+                if matches!(k, "range23" | "accent1" | "accent1Grad") {
+                    ui.separator();
+                }
                 let on = colors == k || (colors.is_empty() && k == "colorful");
                 if ui.selectable_label(on, label).clicked() {
                     run(app, "smartArt.colors", json!({"id": gid, "colors": k}));
@@ -2378,6 +2388,10 @@ fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
         let (r, _) = small_button_ex(ui, Icon::SmartArt, "SmartArt Styles", gid.is_some(), false, true);
         egui::Popup::menu(&r).show(|ui| {
             for (k, label) in deckcraft_engine::cmd::smartart::STYLES {
+                if k == "polished" {
+                    ui.separator();
+                    ui.label("3-D");
+                }
                 let on = style == k || (style.is_empty() && k == "flat");
                 if ui.selectable_label(on, label).clicked() {
                     run(app, "smartArt.style", json!({"id": gid, "style": k}));

From c5a63fc8b7c9d0e58d88b39b38d9996e2f78f83e Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:02:42 +0300
Subject: [PATCH 228/376] SmartArt: node pictures from the data model, Brick
 Scene camera, four more layouts

Node pictures are written on the data model's presentation points (blip through the data part's rels) and read back into the outline on import. Picture Accent Process is hProcess10, not pList2 (checked against PowerPoint's layout list); pList2 is now Horizontal Picture List. Brick Scene looks through an isometric camera. New layouts: Horizontal Picture List, Basic Timeline, Basic Venn, Basic Target.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/smartart.rs | 116 ++++++++++++++++++++++++++++--
 crates/engine/src/tests.rs        |   7 +-
 crates/pptx/src/dgm.rs            |  96 +++++++++++++++++++++----
 crates/pptx/src/read/shapes.rs    |  11 +++
 crates/pptx/src/write/shapes.rs   |   7 +-
 5 files changed, 218 insertions(+), 19 deletions(-)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index b26d0308..6a533015 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -23,7 +23,7 @@ pub const MAX_LEVEL: u8 = 8;
 const MAX_SHAPES: usize = 40;
 
 /// DeckCraft's layouts, with the names PowerPoint's gallery gives them.
-pub const LAYOUTS: [(&str, &str); 18] = [
+pub const LAYOUTS: [(&str, &str); 22] = [
     ("list", "Vertical Bullet List"),
     ("blockList", "Basic Block List"),
     ("hBulletList", "Horizontal Bullet List"),
@@ -42,6 +42,10 @@ pub const LAYOUTS: [(&str, &str); 18] = [
     ("pictureList", "Vertical Picture List"),
     ("pictureCaption", "Picture Caption List"),
     ("pictureProcess", "Picture Accent Process"),
+    ("pictureHList", "Horizontal Picture List"),
+    ("timeline", "Basic Timeline"),
+    ("venn", "Basic Venn"),
+    ("target", "Basic Target"),
 ];
 /// SmartArt Styles.
 pub const STYLES: [(&str, &str); 9] = [
@@ -125,7 +129,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Change Layout",
             ["SmartArt Design", "Layouts"],
             None,
-            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess}",
+            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess|pictureHList|timeline|venn|target}",
             has_selection,
             change_layout
         ),
@@ -323,14 +327,17 @@ fn shade(d: &Diagram, i: usize) -> Option<ColorTransform> {
 
 /// The 3-D XML (`scene3d` + `sp3d`) for a 3-D SmartArt Style: a top bevel (`w`, `h` in points)
 /// lit by the three-point rig.
-fn three_d(bevel: &str, w: f64, h: f64) -> String {
+fn three_d(bevel: &str, w: f64, h: f64, camera: &str) -> String {
     format!(
-        "<a:scene3d><a:camera prst=\"orthographicFront\"/><a:lightRig rig=\"threePt\" dir=\"t\"/></a:scene3d><a:sp3d prstMaterial=\"matte\"><a:bevelT w=\"{}\" h=\"{}\" prst=\"{bevel}\"/></a:sp3d>",
+        "<a:scene3d><a:camera prst=\"{camera}\"/><a:lightRig rig=\"threePt\" dir=\"t\"/></a:scene3d><a:sp3d prstMaterial=\"matte\"><a:bevelT w=\"{}\" h=\"{}\" prst=\"{bevel}\"/></a:sp3d>",
         (w * 12700.0).round() as i64,
         (h * 12700.0).round() as i64
     )
 }
 
+/// Brick Scene's camera: the diagram's shapes seen from above and to the side.
+pub const BRICK_CAMERA: &str = "isometricOffAxis2Top";
+
 /// Whether `style` is one of the 3-D SmartArt Styles.
 pub fn is_3d(style: &str) -> bool {
     matches!(style, "polished" | "inset" | "cartoon" | "powder" | "brick")
@@ -374,7 +381,7 @@ fn paint(d: &Diagram, sh: &mut Shape, i: usize, light: bool) {
             sh.effects = Some(Effects {
                 outer_shadow: (d.style != "inset").then(|| shadow(6.0, 4.0)),
                 bevel: Some(bevel.into()),
-                raw3d: Some(three_d(bevel, bw, bw * 0.6)),
+                raw3d: Some(three_d(bevel, bw, bw * 0.6, if d.style == "brick" { BRICK_CAMERA } else { "orthographicFront" })),
                 ..Default::default()
             });
         }
@@ -778,6 +785,105 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
                 }
             }
         }
+        "pictureHList" => {
+            // Horizontal Picture List: a column per node, a big picture over its text.
+            let w = area.w / nf;
+            for (i, g) in gs.iter().enumerate() {
+                let x = area.x + i as f64 * w + w * 0.04;
+                let bw = w * 0.92;
+                let ph = area.h * 0.55;
+                out.push((picture_shape(d, "rect", Xfrm::new(x, area.y, bw, ph), i, g[0]), vec![]));
+                let mut sh = text_shape("rect", Xfrm::new(x, area.y + ph, bw, area.h - ph), &nodes(g), true);
+                if let Some(b) = &mut sh.text {
+                    b.body.anchor = Some(deckcraft_model::text::Anchor::Top);
+                }
+                paint(d, &mut sh, i, false);
+                out.push((sh, g.clone()));
+            }
+        }
+        "timeline" => {
+            // Basic Timeline: an arrow across the middle, a dot per node on it, the text above and
+            // below in turn.
+            let mid = area.y + area.h / 2.0;
+            let bar = (area.h * 0.08).max(6.0);
+            let mut sh = deco("rightArrow", Xfrm::new(area.x, mid - bar, area.w, bar * 2.0), 0.0);
+            paint(d, &mut sh, 0, true);
+            out.push((sh, vec![]));
+            let w = area.w * 0.92 / nf;
+            for (i, g) in gs.iter().enumerate() {
+                let cx = area.x + w * (i as f64 + 0.5);
+                let dot = bar * 1.4;
+                let mut dsh = deco("ellipse", Xfrm::new(cx - dot / 2.0, mid - dot / 2.0, dot, dot), 0.0);
+                paint(d, &mut dsh, i, false);
+                out.push((dsh, vec![]));
+                let th = area.h / 2.0 - bar * 1.6;
+                let y = if i % 2 == 0 { area.y } else { mid + bar * 1.6 };
+                let mut t = text_shape("rect", Xfrm::new(cx - w * 0.48, y, w * 0.96, th.max(1.0)), &nodes(g), true);
+                if let Some(b) = &mut t.text {
+                    b.body.anchor = Some(if i % 2 == 0 { deckcraft_model::text::Anchor::Bottom } else { deckcraft_model::text::Anchor::Top });
+                }
+                paint(d, &mut t, i, true);
+                t.fill = Some(Fill::None);
+                t.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+                out.push((t, g.clone()));
+            }
+        }
+        "venn" => {
+            // Basic Venn: see-through circles overlapping in a ring (two or three in a row/triangle).
+            let s = area.h.min(area.w);
+            let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
+            let dc = if n == 1 { s } else { s * 0.62 };
+            let r = if n == 1 { 0.0 } else { (s - dc) / 2.0 };
+            for (i, g) in gs.iter().enumerate() {
+                let a = (i as f64 / nf * 360.0 + if n == 2 { 180.0 } else { -90.0 }).to_radians();
+                let mut sh = text_shape("ellipse", Xfrm::new(cx + r * a.cos() - dc / 2.0, cy + r * a.sin() - dc / 2.0, dc, dc), &nodes(g), true);
+                paint(d, &mut sh, i, false);
+                if let Some(Fill::Solid { color: c }) = &mut sh.fill {
+                    *c = c.clone().with(ColorTransform::Alpha(50_000));
+                }
+                if let Some(b) = &mut sh.text {
+                    // Text towards the circle's outer side, clear of the overlap.
+                    let p = dc * 0.18;
+                    let (dx, dy) = (a.cos() * p, a.sin() * p);
+                    b.body.inset_l = Some((7.2 + dx).max(2.0));
+                    b.body.inset_r = Some((7.2 - dx).max(2.0));
+                    b.body.inset_t = Some((3.6 + dy).max(2.0));
+                    b.body.inset_b = Some((3.6 - dy).max(2.0));
+                }
+                out.push((sh, g.clone()));
+            }
+        }
+        "target" => {
+            // Basic Target: nested rings, the outermost first, each ring's text in a box beside it
+            // with a line from the ring.
+            let s = area.h.min(area.w * 0.5);
+            let (cx, cy) = (area.x + s / 2.0, area.y + area.h / 2.0);
+            let band = s / 2.0 / nf;
+            for (i, _) in gs.iter().enumerate() {
+                let dc = s - 2.0 * band * i as f64;
+                let mut sh = deco("ellipse", Xfrm::new(cx - dc / 2.0, cy - dc / 2.0, dc, dc), 0.0);
+                paint(d, &mut sh, i, false);
+                out.push((sh, vec![]));
+            }
+            let tx = area.x + s + area.w * 0.06;
+            let rh = area.h / nf;
+            for (i, g) in gs.iter().enumerate() {
+                let ty = area.y + rh * (i as f64 + 0.5);
+                // The point on ring i's band level with the text, else its top.
+                let ry = cy - s / 2.0 + band * (i as f64 + 0.5);
+                out.push((line_shape((cx, ry.min(ty)), (tx, ty)), vec![]));
+                let mut t = text_shape("rect", Xfrm::new(tx, ty - rh * 0.45, (area.x + area.w - tx).max(1.0), rh * 0.9), &nodes(g), true);
+                paint(d, &mut t, i, true);
+                t.fill = Some(Fill::None);
+                t.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+                if let Some(b) = &mut t.text {
+                    for p in &mut b.paragraphs {
+                        p.props.align = Some(Align::Left);
+                    }
+                }
+                out.push((t, g.clone()));
+            }
+        }
         _ => {}
     }
     out
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index f66f84fe..e75b25a8 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -952,7 +952,12 @@ fn smartart_pictures_3d_styles_and_colour_variants() {
     let bytes = deckcraft_pptx::export(s.doc().unwrap().doc.as_ref()).unwrap();
     let back = deckcraft_pptx::import(&bytes).unwrap();
     assert!(back.validate().is_empty());
-    assert_eq!(back.slides[1].shapes.iter().find_map(|x| x.diagram.as_ref()).map(|d| d.kind.clone()).as_deref(), Some("pictureCaption"));
+    let bd = back.slides[1].shapes.iter().find_map(|x| x.diagram.as_ref()).unwrap();
+    assert_eq!(bd.kind, "pictureCaption");
+    // The node's picture comes back from the data model's blip, as its media.
+    let m = bd.nodes[0].picture.expect("node picture read back");
+    assert!(back.media(m).is_some_and(|x| !x.data.is_empty()));
+    assert!(bd.nodes.iter().skip(1).all(|n| n.picture.is_none()));
     s.execute("smartArt.picture", &json!({"index": 0, "reset": true})).unwrap();
     assert!(pics(&s).iter().all(|p| !matches!(p.fill, Some(deckcraft_model::Fill::Picture(_)))));
 
diff --git a/crates/pptx/src/dgm.rs b/crates/pptx/src/dgm.rs
index e748da3e..be5a280e 100644
--- a/crates/pptx/src/dgm.rs
+++ b/crates/pptx/src/dgm.rs
@@ -111,7 +111,11 @@ pub fn layout_id(kind: &str) -> &'static str {
         "titledMatrix" => "urn:microsoft.com/office/officeart/2005/8/layout/matrix1",
         "pictureList" => "urn:microsoft.com/office/officeart/2005/8/layout/vList4",
         "pictureCaption" => "urn:microsoft.com/office/officeart/2005/8/layout/pList1",
-        "pictureProcess" => "urn:microsoft.com/office/officeart/2005/8/layout/pList2",
+        "pictureProcess" => "urn:microsoft.com/office/officeart/2005/8/layout/hProcess10",
+        "pictureHList" => "urn:microsoft.com/office/officeart/2005/8/layout/pList2",
+        "timeline" => "urn:microsoft.com/office/officeart/2005/8/layout/hProcess11",
+        "venn" => "urn:microsoft.com/office/officeart/2005/8/layout/venn1",
+        "target" => "urn:microsoft.com/office/officeart/2005/8/layout/target1",
         _ => "urn:microsoft.com/office/officeart/2005/8/layout/vList2",
     }
 }
@@ -138,6 +142,10 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         "pictureList",
         "pictureCaption",
         "pictureProcess",
+        "pictureHList",
+        "timeline",
+        "venn",
+        "target",
         "list",
     ] {
         if layout_id == layout_id_of(k) {
@@ -145,7 +153,13 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         }
     }
     let s = format!("{last} {}", category.to_ascii_lowercase());
-    if s.contains("hierarchy") || s.contains("orgchart") {
+    if s.contains("venn") {
+        "venn"
+    } else if s.contains("target") {
+        "target"
+    } else if s.contains("timeline") {
+        "timeline"
+    } else if s.contains("hierarchy") || s.contains("orgchart") {
         "hierarchy"
     } else if s.contains("radial") {
         "radial"
@@ -174,7 +188,8 @@ fn layout_id_of(kind: &str) -> &'static str {
 
 fn category(kind: &str) -> &'static str {
     match kind {
-        "process" | "chevron" | "verticalProcess" | "stepUp" | "pictureProcess" => "process",
+        "process" | "chevron" | "verticalProcess" | "stepUp" | "pictureProcess" | "timeline" => "process",
+        "venn" | "target" => "relationship",
         "cycle" | "blockCycle" | "radial" => "cycle",
         "hierarchy" => "hierarchy",
         "pyramid" | "invertedPyramid" => "pyramid",
@@ -206,8 +221,8 @@ fn text(w: &mut W, t: &str) {
 }
 
 /// `ppt/diagrams/dataN.xml` for the outline. `drawing_rel` is the slide's relationship id of the
-/// cached drawing.
-pub fn data_xml(d: &Diagram, seed: u32, drawing_rel: &str) -> Vec<u8> {
+/// cached drawing; `pics` the data part's relationship ids of node pictures, by node index.
+pub fn data_xml(d: &Diagram, seed: u32, drawing_rel: &str, pics: &[(usize, String)]) -> Vec<u8> {
     let lo = if d.layout_id.is_empty() { layout_id(&d.kind).to_string() } else { d.layout_id.clone() };
     let mut w = W::new();
     w.open("dgm:dataModel", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("xmlns:r", crate::opc::NS_R));
@@ -245,6 +260,24 @@ pub fn data_xml(d: &Diagram, seed: u32, drawing_rel: &str) -> Vec<u8> {
             w.close("dgm:pt");
         }
     }
+    // A node's picture sits on the presentation point of its picture placeholder, as PowerPoint
+    // stores it (`presAssocID` names the node, the blip is a relationship of the data part).
+    for (k, rid) in pics {
+        if *k >= d.nodes.len() {
+            continue;
+        }
+        w.open("dgm:pt", A::new().a("modelId", guid(seed, 0x20_0000 + k)).a("type", "pres"));
+        w.empty("dgm:prSet", A::new().a("presAssocID", node(*k)).a("presName", "Image").a("presStyleLbl", "fgImgPlace1"));
+        w.open0("dgm:spPr");
+        w.open0("a:blipFill");
+        w.empty("a:blip", A::new().a("r:embed", rid.as_str()));
+        w.open0("a:stretch");
+        w.empty0("a:fillRect");
+        w.close("a:stretch");
+        w.close("a:blipFill");
+        w.close("dgm:spPr");
+        w.close("dgm:pt");
+    }
     w.close("dgm:ptLst");
     w.open0("dgm:cxnLst");
     let mut stack: Vec<(u8, String)> = vec![];
@@ -286,6 +319,31 @@ pub fn data_xml(d: &Diagram, seed: u32, drawing_rel: &str) -> Vec<u8> {
 
 /// The outline of a data part: the `parOf` tree under the document point, depth first.
 pub fn outline(data: &El) -> Vec<DiagramNode> {
+    outline_ids(data).into_iter().map(|(_, n)| n).collect()
+}
+
+/// The relationship ids (of the data part) of node pictures, by node index in [`outline`]: the
+/// blip fill of a presentation point associated with the node.
+pub fn node_pictures(data: &El) -> Vec<(usize, String)> {
+    let ids: HashMap<String, usize> = outline_ids(data).into_iter().enumerate().map(|(k, (id, _))| (id, k)).collect();
+    let Some(pts) = data.child("ptLst") else { return vec![] };
+    let mut out: Vec<(usize, String)> = vec![];
+    for pt in pts.children_named("pt").take(MAX_NODES * 8) {
+        if pt.attr("type") != Some("pres") {
+            continue;
+        }
+        let Some(k) = pt.child("prSet").and_then(|p| p.attr("presAssocID")).and_then(|a| ids.get(a)) else { continue };
+        let Some(rid) = pt.child("spPr").and_then(|s| s.child("blipFill")).and_then(|b| b.child("blip")).and_then(|b| b.attr("r:embed")) else {
+            continue;
+        };
+        if !out.iter().any(|(j, _)| j == k) {
+            out.push((*k, rid.to_string()));
+        }
+    }
+    out
+}
+
+fn outline_ids(data: &El) -> Vec<(String, DiagramNode)> {
     let Some(pts) = data.child("ptLst") else { return vec![] };
     let mut texts: HashMap<&str, String> = HashMap::new();
     let mut doc: Option<&str> = None;
@@ -324,7 +382,7 @@ pub fn outline(data: &El) -> Vec<DiagramNode> {
         if out.len() >= MAX_NODES || !seen.insert(id) {
             continue;
         }
-        out.push(DiagramNode { text: texts.get(id).cloned().unwrap_or_default(), level: level.min(8), picture: None });
+        out.push((id.to_string(), DiagramNode { text: texts.get(id).cloned().unwrap_or_default(), level: level.min(8), picture: None }));
         if let Some(v) = kids.get(id) {
             stack.extend(v.iter().rev().map(|(_, c)| (*c, level.saturating_add(1))));
         }
@@ -348,10 +406,12 @@ fn paragraphs(t: &El) -> String {
 /// The layout algorithm and node shape of a DeckCraft layout.
 fn alg(kind: &str) -> (&'static str, Vec<(&'static str, &'static str)>, &'static str) {
     match kind {
-        "process" | "stepUp" | "pictureProcess" | "pictureCaption" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "roundRect"),
+        "process" | "stepUp" | "pictureProcess" | "pictureCaption" | "pictureHList" | "timeline" => {
+            ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "roundRect")
+        }
         "chevron" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "chevron"),
         "verticalProcess" => ("lin", vec![("linDir", "fromT"), ("nodeHorzAlign", "ctr")], "roundRect"),
-        "cycle" | "radial" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse"),
+        "cycle" | "radial" | "venn" | "target" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse"),
         "blockCycle" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "roundRect"),
         "pyramid" | "invertedPyramid" => {
             ("pyra", vec![("linDir", if kind == "pyramid" { "fromT" } else { "fromB" }), ("txDir", "fromT"), ("pyraAcctPos", "bef")], "trapezoid")
@@ -500,6 +560,8 @@ fn bevel(style: &str) -> Option<(&'static str, i64)> {
 
 /// `ppt/diagrams/quickStyleN.xml`: flat shapes drawn from the theme's first styles.
 pub fn style_xml(style: &str) -> Vec<u8> {
+    // Brick Scene looks at the diagram from above and to the side.
+    let camera = if style == "brick" { "isometricOffAxis2Top" } else { "orthographicFront" };
     let mut w = W::new();
     w.open("dgm:styleDef", A::new().a("xmlns:dgm", NS_DGM).a("xmlns:a", crate::opc::NS_A).a("uniqueId", qs_id(style)));
     w.empty("dgm:title", A::new().a("val", ""));
@@ -508,12 +570,12 @@ pub fn style_xml(style: &str) -> Vec<u8> {
     w.empty("dgm:cat", A::new().a("type", if bevel(style).is_some() { "3D" } else { "simple" }).a("pri", "10100"));
     w.close("dgm:catLst");
     w.open0("dgm:scene3d");
-    w.empty("a:camera", A::new().a("prst", "orthographicFront"));
+    w.empty("a:camera", A::new().a("prst", camera));
     w.empty("a:lightRig", A::new().a("rig", "threePt").a("dir", "t"));
     w.close("dgm:scene3d");
     w.open("dgm:styleLbl", A::new().a("name", "node1"));
     w.open0("dgm:scene3d");
-    w.empty("a:camera", A::new().a("prst", "orthographicFront"));
+    w.empty("a:camera", A::new().a("prst", camera));
     w.empty("a:lightRig", A::new().a("rig", "threePt").a("dir", "t"));
     w.close("dgm:scene3d");
     match bevel(style) {
@@ -593,7 +655,7 @@ mod tests {
     fn outline_survives_the_data_model() {
         let d =
             Diagram { kind: "hierarchy".into(), nodes: nodes(&[("CEO", 0), ("CTO", 1), ("Dev", 2), ("CFO", 1), ("Board", 0)]), ..Default::default() };
-        let xml = data_xml(&d, 7, "rId9");
+        let xml = data_xml(&d, 7, "rId9", &[]);
         let doc = crate::xml::parse(&xml).unwrap();
         assert_eq!(outline(&doc.root), d.nodes);
         let s = String::from_utf8(xml).unwrap();
@@ -613,6 +675,14 @@ mod tests {
         }
     }
 
+    #[test]
+    fn node_pictures_come_from_presentation_points() {
+        let d = Diagram { kind: "pictureList".into(), nodes: nodes(&[("A", 0), ("a", 1), ("B", 0)]), ..Default::default() };
+        let xml = data_xml(&d, 3, "rId1", &[(2, "rId7".into()), (9, "rId8".into())]);
+        let doc = crate::xml::parse(&xml).unwrap();
+        assert_eq!(node_pictures(&doc.root), vec![(2, "rId7".to_string())]);
+    }
+
     #[test]
     fn style_and_colour_ids_round_trip() {
         for st in ["", "subtle", "intense", "outline", "polished", "inset", "cartoon", "powder", "brick"] {
@@ -622,7 +692,9 @@ mod tests {
             assert_eq!(colors_for(&cs_id(c)), c);
         }
         assert!(String::from_utf8(style_xml("cartoon")).unwrap().contains("bevelT"));
-        for k in ["pictureList", "pictureCaption", "pictureProcess"] {
+        assert!(layout_id("pictureProcess").ends_with("/hProcess10"), "Picture Accent Process");
+        assert!(layout_id("pictureHList").ends_with("/pList2"), "Horizontal Picture List");
+        for k in ["pictureList", "pictureCaption", "pictureProcess", "pictureHList", "timeline", "venn", "target"] {
             assert_eq!(kind_for(layout_id(k), ""), k);
         }
     }
diff --git a/crates/pptx/src/read/shapes.rs b/crates/pptx/src/read/shapes.rs
index 34d7bbc1..e9ea5ffb 100644
--- a/crates/pptx/src/read/shapes.rs
+++ b/crates/pptx/src/read/shapes.rs
@@ -433,6 +433,17 @@ fn smartart(imp: &mut Imp, part: &Part, gd: &El, frame: &Shape, depth: usize) ->
     let x = frame.xfrm.unwrap_or_default();
     g.kind = ShapeKind::Group { children, child: Xfrm::new(0.0, 0.0, x.w, x.h) };
     g.diagram = diagram_outline(imp, part, rel_ids, &data.root);
+    // Node pictures, from the blips of the data model's presentation points.
+    if let Some(d) = &mut g.diagram {
+        let rels = imp.pkg.rels(&dm.target);
+        for (k, rid) in crate::dgm::node_pictures(&data.root) {
+            let Some(target) = rels.get(&rid).filter(|r| !r.external).map(|r| r.target.clone()) else { continue };
+            let media = imp.media_for(&target);
+            if let Some(n) = d.nodes.get_mut(k) {
+                n.picture = media;
+            }
+        }
+    }
     Some(g)
 }
 
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 26cb67de..536ecfdd 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -470,7 +470,12 @@ fn diagram(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, d: &dec
     let rel = |o: &mut Out, kind: &str, part: &str| o.rels.add_new(kind, &crate::opc::relative(&o.name, part), false);
     let drawing_rel = rel(o, dgm::RT_DRAWING, &dname);
     let data = name("data");
-    x.pkg.xml_part(&data, dgm::CT_DATA, dgm::data_xml(d, s.id.0, &drawing_rel));
+    // Node pictures: on the data model's presentation points, through the data part's rels.
+    let mut mout = Out::new(&data);
+    let pics: Vec<(usize, String)> =
+        d.nodes.iter().enumerate().filter_map(|(k, n)| n.picture.and_then(|m| x.media_rel(&mut mout, m, "image")).map(|r| (k, r))).collect();
+    x.pkg.xml_part(&data, dgm::CT_DATA, dgm::data_xml(d, s.id.0, &drawing_rel, &pics));
+    x.pkg.rels(&data, &mout.rels);
     let dm = rel(o, "diagramData", &data);
     let layout = name("layout");
     let lo_xml = d.layout_xml.clone().map(String::into_bytes).unwrap_or_else(|| dgm::layout_xml(&d.kind));

From a29e200a4ec3df766a2e628e4b6d440ba090d760 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:05:22 +0300
Subject: [PATCH 229/376] Spelling: background squiggles, Add to Dictionary,
 per-run languages, compounds

---
 crates/engine/src/cmd/review.rs      |  92 ++++++---
 crates/engine/src/cmd/text.rs        |  21 +++
 crates/engine/src/spell.rs           | 271 ++++++++++++++++++++++++++-
 crates/engine/src/tests.rs           |  38 ++++
 crates/ui-egui/src/canvas.rs         |  40 ++++
 crates/ui-egui/src/dialogs.rs        |   5 +
 crates/ui-egui/src/lib.rs            |   4 +
 crates/ui-egui/src/spelling_tests.rs |  69 +++++++
 crates/ui-egui/src/squiggles.rs      | 260 +++++++++++++++++++++++++
 docs/gaps.md                         |  13 +-
 10 files changed, 780 insertions(+), 33 deletions(-)
 create mode 100644 crates/ui-egui/src/squiggles.rs

diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 822d6e92..54751567 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -16,16 +16,17 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("comment.resolve", "Resolve Thread", ["Comments"], None, "{index, resolved?: bool}", has_slide, resolve),
         cmd!(query "comment.list", "Comments", [], None, "{slide?} → comments", has_slide, list),
         cmd!(query "review.accessibility", "Check Accessibility", ["Review", "Accessibility"], None, "{} → [{slide, shape, issue}]", has_doc, accessibility),
-        cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{lang?, ignore?:[word]} → [{slide, shape, word, lang, suggestions}] (Hunspell dictionaries installed on the system, else a built-in list of common misspellings)", has_doc, spelling),
+        cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{lang?, ignore?:[word]} → [{slide, shape, para, start, end, word, lang, suggestions}] (each run in its own language, lang? for runs without one; Hunspell dictionaries installed on the system, else a built-in list of common misspellings)", has_doc, spelling),
         cmd!(
             "review.spellingChange",
             "Change Spelling",
             ["Review", "Proofing"],
             None,
-            "{shape, word, to, all?} → {changed} (replace the whole word in that shape's text, or in every shape with all)",
+            "{shape, word, to, all?, para?, start?} → {changed} (replace the whole word in that shape's text, the one at para/start, or in every shape with all)",
             has_doc,
             spelling_change
         ),
+        cmd!(noundo "review.addToDictionary", "Add to Dictionary", ["Review", "Proofing"], None, "{word} → {word, file} (append to the user dictionary file; not an undo step)", always, add_to_dictionary),
         cmd!(query "review.dictionary", "Spelling Dictionary", ["Review", "Proofing"], None, "{lang?} → {lang, available, found, folders} (whether review.spelling has a dictionary, and which file)", always, dictionary_info),
         cmd!(noundo "show.fromStart", "Play from Start", ["Slide Show", "Start Slide Show"], Some("Cmd+Shift+Enter"), "{}", has_slide, |s, _| start(s, 0)),
         cmd!(noundo "show.fromCurrent", "Play from Current Slide", ["Slide Show", "Start Slide Show"], Some("Cmd+Enter"), "{}", has_slide, |s, _| {
@@ -226,37 +227,30 @@ fn check_lang(doc: &deckcraft_model::Presentation, p: &Value) -> String {
     found.unwrap_or_else(|| "en-US".into())
 }
 
-/// The words of `text`: letters, digits, apostrophes inside a word and the dictionary's extras.
-fn words<'a>(text: &'a str, extra: &[char]) -> Vec<&'a str> {
-    text.split(|c: char| !(c.is_alphanumeric() || c == '\'' || c == '’' || extra.contains(&c)))
-        .map(|w| w.trim_matches(|c| c == '\'' || c == '’'))
-        .filter(|w| !w.is_empty() && w.chars().any(char::is_alphabetic) && !w.chars().any(|c| c.is_ascii_digit()))
-        .collect()
-}
-
 fn spelling(s: &mut Session, p: &Value) -> Result<Value> {
     let st = s.doc()?;
-    let lang = check_lang(&st.doc, p);
+    let default = check_lang(&st.doc, p);
     let ignore: Vec<String> =
         p.get("ignore").and_then(Value::as_array).map(|a| a.iter().filter_map(Value::as_str).map(str::to_lowercase).collect()).unwrap_or_default();
-    let dict = crate::spell::dictionary(&lang);
-    let extra: Vec<char> = dict.as_ref().map(|d| d.word_chars().to_vec()).unwrap_or_default();
+    let mut dicts: std::collections::HashMap<String, Option<Arc<crate::spell::Dictionary>>> = Default::default();
     let mut out = vec![];
     for (i, sl) in st.doc.slides.iter().enumerate() {
         deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
             let Some(t) = &sh.text else { return };
-            let text = t.text();
-            for w in words(&text, &extra) {
-                if ignore.contains(&w.to_lowercase()) {
-                    continue;
-                }
-                let bad = match &dict {
-                    Some(d) => !d.check(w),
-                    None => COMMON.contains(&w.to_lowercase().as_str()),
-                };
-                if bad {
-                    let sug = dict.as_ref().map(|d| d.suggest(w, 5)).unwrap_or_default();
-                    out.push(json!({"slide": i, "shape": sh.id, "word": w, "lang": lang, "suggestions": sug}));
+            for (pi, para) in t.paragraphs.iter().enumerate() {
+                for w in crate::spell::paragraph_words(para, &default) {
+                    if ignore.contains(&w.text.to_lowercase()) {
+                        continue;
+                    }
+                    let dict = dicts.entry(w.lang.clone()).or_insert_with(|| crate::spell::dictionary(&w.lang)).clone();
+                    let bad = match &dict {
+                        Some(d) => !crate::spell::is_correct(d, &w.text),
+                        None => COMMON.contains(&w.text.to_lowercase().as_str()),
+                    };
+                    if bad {
+                        let sug = dict.as_ref().map(|d| d.suggest(&w.text, 5)).unwrap_or_default();
+                        out.push(json!({"slide": i, "shape": sh.id, "para": pi, "start": w.start, "end": w.end, "word": w.text, "lang": w.lang, "suggestions": sug}));
+                    }
                 }
             }
         });
@@ -264,6 +258,12 @@ fn spelling(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(Value::Array(out))
 }
 
+fn add_to_dictionary(_s: &mut Session, p: &Value) -> Result<Value> {
+    let word = str_param(p, "word").filter(|w| !w.trim().is_empty()).ok_or_else(|| bad("review.addToDictionary", "missing `word`"))?;
+    crate::spell::add_user_word(word).map_err(|e| bad("review.addToDictionary", e.to_string()))?;
+    Ok(json!({"word": word.trim(), "file": crate::spell::user_dictionary_path().map(|p| p.display().to_string())}))
+}
+
 /// Replace whole-word `from` with `to` in `text`; how many were replaced.
 fn replace_word(text: &mut String, from: &str, to: &str, all: bool) -> usize {
     let is_word = |c: char| c.is_alphanumeric() || c == '\'' || c == '’';
@@ -295,6 +295,29 @@ fn spelling_change(s: &mut Session, p: &Value) -> Result<Value> {
     if shape.is_none() && !all {
         return Err(bad("review.spellingChange", "give `shape`, or `all: true`"));
     }
+    // One exact occurrence (a squiggled word): paragraph `para`, from character `start`.
+    if let (Some(id), Some(para), Some(start)) = (shape, usize_param(p, "para"), usize_param(p, "start")) {
+        let id = deckcraft_model::ShapeId(u32::try_from(id).map_err(|_| bad("review.spellingChange", "bad `shape`"))?);
+        let end = start + word.chars().count();
+        let slide = {
+            let st = s.doc()?;
+            let found = st.doc.slides.iter().position(|sl| {
+                deckcraft_model::find_shape(&sl.shapes, id)
+                    .and_then(|sh| sh.text.as_ref()?.paragraphs.get(para))
+                    .is_some_and(|pp| pp.text().chars().skip(start).take(end - start).collect::<String>() == word)
+            });
+            found.ok_or_else(|| bad("review.spellingChange", "the word isn't there"))?
+        };
+        s.edit(|doc, _| {
+            let sl = doc.slides.get_mut(slide).ok_or_else(|| bad("review.spellingChange", "no slide"))?;
+            let sh = deckcraft_model::find_shape_mut(&mut Arc::make_mut(sl).shapes, id).ok_or_else(|| bad("review.spellingChange", "no shape"))?;
+            if let Some(pp) = sh.text.as_mut().and_then(|t| t.paragraphs.get_mut(para)) {
+                replace_chars(pp, start, end, &to);
+            }
+            Ok(())
+        })?;
+        return Ok(json!({"changed": 1}));
+    }
     // Nothing to change makes no undo step.
     let mut any = false;
     let st = s.doc()?;
@@ -339,6 +362,25 @@ fn spelling_change(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"changed": changed}))
 }
 
+/// Replace characters `start..end` of `p` with `to`, in the run where they start (later runs lose
+/// the rest of the range).
+fn replace_chars(p: &mut deckcraft_model::Paragraph, start: usize, end: usize, to: &str) {
+    let mut at = 0;
+    let mut placed = false;
+    for r in &mut p.runs {
+        let n = r.char_len();
+        let (a, b) = (start.max(at), end.min(at + n));
+        if a < b && r.kind == deckcraft_model::text::RunKind::Text {
+            let byte = |c: usize| r.text.char_indices().nth(c).map_or(r.text.len(), |(i, _)| i);
+            let (x, y) = (byte(a - at), byte(b - at));
+            r.text.replace_range(x..y, if placed { "" } else { to });
+            placed = true;
+        }
+        at += n;
+    }
+    p.runs.retain(|r| !(r.kind == deckcraft_model::text::RunKind::Text && r.text.is_empty()));
+}
+
 fn walk_text_mut(shapes: &mut [deckcraft_model::Shape], depth: usize, f: &mut dyn FnMut(&mut deckcraft_model::Shape)) {
     if depth > 64 {
         return;
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..cae4f319 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -485,6 +485,27 @@ fn commit(s: &mut Session, p: &Value) -> Result<Value> {
 /// Underlines under an input method's composition (#101), in slide coordinates: `(from, to,
 /// thick)` per line, thick under the part being converted. Empty without a composition or when
 /// the edited text isn't laid out on the slide (notes, table cells).
+/// Underlines (slide coordinates) under character ranges `(para, start, end)` of shape `id`'s
+/// text as laid out on the current slide: where spelling squiggles go.
+pub fn range_underlines(
+    st: &DocState,
+    id: deckcraft_model::ShapeId,
+    ranges: &[(usize, usize, usize)],
+) -> Vec<(deckcraft_geom::Point, deckcraft_geom::Point)> {
+    let Some(sh) = st.shape(id) else { return vec![] };
+    let Some(l) = layout_for(st, &TextSel { shape: id, ..Default::default() }) else { return vec![] };
+    let x = xfrm_of(&st.doc, &st.selection, sh);
+    let tr = deckcraft_render::shape_geometry(sh, x.w, x.h).text_rect;
+    let m = deckcraft_render::text_transform(x.affine(), tr, l.rotation);
+    let mut out = vec![];
+    for &(para, a, b) in ranges {
+        for (x0, x1, y) in l.composition_underlines(deckcraft_text::Pos { para, ch: a }, deckcraft_text::Pos { para, ch: b }) {
+            out.push((m * deckcraft_geom::Point::new(x0, y), m * deckcraft_geom::Point::new(x1, y)));
+        }
+    }
+    out
+}
+
 pub fn composition_underlines(st: &DocState) -> Vec<(deckcraft_geom::Point, deckcraft_geom::Point, bool)> {
     let (Some(c), Some(t)) = (&st.composition, &st.selection.text) else { return vec![] };
     let Some(sh) = st.shape(t.shape) else { return vec![] };
diff --git a/crates/engine/src/spell.rs b/crates/engine/src/spell.rs
index 4c089812..bf0e1660 100644
--- a/crates/engine/src/spell.rs
+++ b/crates/engine/src/spell.rs
@@ -103,6 +103,13 @@ pub struct Dictionary {
     need_affix: Option<Flag>,
     no_suggest: Option<Flag>,
     keep_case: Option<Flag>,
+    only_in_compound: Option<Flag>,
+    compound: Option<Flag>,
+    compound_begin: Option<Flag>,
+    compound_middle: Option<Flag>,
+    compound_end: Option<Flag>,
+    compound_min: usize,
+    compound_max: usize,
 }
 
 fn decode(bytes: &[u8], latin1: bool) -> String {
@@ -144,7 +151,7 @@ impl Dictionary {
                 })
             })
             .unwrap_or(FlagMode::Char);
-        let mut d = Dictionary::default();
+        let mut d = Dictionary { compound_min: 3, ..Dictionary::default() };
         let mut lines = aff.lines().map(|l| l.split('#').next().unwrap_or("")).peekable();
         while let Some(l) = lines.next() {
             let w: Vec<&str> = l.split_whitespace().collect();
@@ -155,6 +162,13 @@ impl Dictionary {
                 ["NEEDAFFIX", f, ..] | ["PSEUDOROOT", f, ..] => d.need_affix = one_flag(Some(f), mode),
                 ["NOSUGGEST", f, ..] => d.no_suggest = one_flag(Some(f), mode),
                 ["KEEPCASE", f, ..] => d.keep_case = one_flag(Some(f), mode),
+                ["ONLYINCOMPOUND", f, ..] => d.only_in_compound = one_flag(Some(f), mode),
+                ["COMPOUNDFLAG", f, ..] => d.compound = one_flag(Some(f), mode),
+                ["COMPOUNDBEGIN", f, ..] => d.compound_begin = one_flag(Some(f), mode),
+                ["COMPOUNDMIDDLE", f, ..] => d.compound_middle = one_flag(Some(f), mode),
+                ["COMPOUNDEND", f, ..] | ["COMPOUNDLAST", f, ..] => d.compound_end = one_flag(Some(f), mode),
+                ["COMPOUNDMIN", n, ..] => d.compound_min = n.parse::<usize>().unwrap_or(3).max(1),
+                ["COMPOUNDWORDMAX", n, ..] => d.compound_max = n.parse().unwrap_or(0),
                 ["REP", n] => {
                     for _ in 0..n.parse::<usize>().unwrap_or(0) {
                         let r: Vec<&str> = lines.next().unwrap_or("").split_whitespace().collect();
@@ -220,7 +234,12 @@ impl Dictionary {
     /// `word` as a root carrying all of `need` (and not forbidden).
     fn root(&self, word: &str, need: &[Flag], affixed: bool) -> bool {
         self.words.get(word).is_some_and(|hs| {
-            hs.iter().any(|f| !self.has(f, self.forbidden) && (affixed || !self.has(f, self.need_affix)) && need.iter().all(|n| f.contains(n)))
+            hs.iter().any(|f| {
+                !self.has(f, self.forbidden)
+                    && (affixed || !self.has(f, self.need_affix))
+                    && !self.has(f, self.only_in_compound)
+                    && need.iter().all(|n| f.contains(n))
+            })
         })
     }
 
@@ -263,6 +282,53 @@ impl Dictionary {
         false
     }
 
+    /// A root (or, for the last part, a suffixed root) carrying `flag`, as a compound part.
+    fn compound_part(&self, part: &[char], flag: Flag, last: bool) -> bool {
+        let word: String = part.iter().collect();
+        let ok = self.words.get(&word).is_some_and(|hs| hs.iter().any(|f| !self.has(f, self.forbidden) && f.contains(&flag)));
+        ok || (last && self.suffixed_compound_end(part, flag))
+    }
+
+    /// The last part of a compound with a suffix: the root must carry the compound `flag`.
+    fn suffixed_compound_end(&self, w: &[char], flag: Flag) -> bool {
+        self.sfx.iter().any(|s| {
+            strip_end(w, &s.add, &s.strip).is_some_and(|stem| {
+                s.cond_ok(&stem, false)
+                    && self
+                        .words
+                        .get(&stem.iter().collect::<String>())
+                        .is_some_and(|hs| hs.iter().any(|f| !self.has(f, self.forbidden) && f.contains(&flag) && f.contains(&s.flag)))
+            })
+        })
+    }
+
+    /// `w` made of dictionary parts allowed in compounds (`COMPOUNDFLAG`, or the begin, middle and
+    /// end flags), each at least `COMPOUNDMIN` characters long.
+    fn compounded(&self, w: &[char], index: usize) -> bool {
+        if self.compound.is_none() && self.compound_end.is_none() {
+            return false;
+        }
+        let min = self.compound_min.max(1);
+        if index >= 8 || (self.compound_max > 0 && index + 1 >= self.compound_max) || w.len() < 2 * min {
+            return false;
+        }
+        let role = if index == 0 { self.compound_begin } else { self.compound_middle };
+        for i in min..=w.len() - min {
+            let (head, rest) = w.split_at(i);
+            let head_ok = [self.compound, role].into_iter().flatten().any(|f| self.compound_part(head, f, false));
+            if !head_ok {
+                continue;
+            }
+            if [self.compound, self.compound_end].into_iter().flatten().any(|f| self.compound_part(rest, f, true)) {
+                return true;
+            }
+            if self.compounded(rest, index + 1) {
+                return true;
+            }
+        }
+        false
+    }
+
     fn check_exact(&self, word: &str) -> bool {
         if self.forbidden_word(word) {
             return false;
@@ -286,7 +352,7 @@ impl Dictionary {
                 return true;
             }
         }
-        false
+        self.compounded(&w, 0)
     }
 
     /// Is `word` spelt correctly? Capitalised and upper-case forms of a lower-case word pass.
@@ -494,6 +560,168 @@ pub fn dictionary(lang: &str) -> Option<Arc<Dictionary>> {
     loaded
 }
 
+/// Where Add to Dictionary keeps words: `user.dic` in DeckCraft's own dictionaries folder, one
+/// word per line (the Hunspell `.dic` format without a count).
+pub fn user_dictionary_path() -> Option<PathBuf> {
+    if let Ok(p) = user_override().lock()
+        && let Some(p) = p.clone()
+    {
+        return Some(p);
+    }
+    let home = std::env::var_os("HOME").map(PathBuf::from);
+    let dir = if cfg!(target_os = "macos") {
+        home.map(|h| h.join("Library/Application Support/DeckCraft/Dictionaries"))
+    } else if cfg!(target_os = "windows") {
+        std::env::var_os("APPDATA").map(|a| PathBuf::from(a).join("DeckCraft").join("Dictionaries"))
+    } else {
+        std::env::var_os("XDG_DATA_HOME")
+            .map(PathBuf::from)
+            .or_else(|| home.map(|h| h.join(".local/share")))
+            .map(|d| d.join("deckcraft/dictionaries"))
+    };
+    dir.map(|d| d.join("user.dic"))
+}
+
+fn user_override() -> &'static Mutex<Option<PathBuf>> {
+    static P: OnceLock<Mutex<Option<PathBuf>>> = OnceLock::new();
+    P.get_or_init(Default::default)
+}
+
+struct UserWords {
+    words: Option<HashSet<String>>,
+    generation: u64,
+}
+
+fn user_state() -> &'static Mutex<UserWords> {
+    static U: OnceLock<Mutex<UserWords>> = OnceLock::new();
+    U.get_or_init(|| Mutex::new(UserWords { words: None, generation: 0 }))
+}
+
+/// Keep the user dictionary at `path` instead (tests, or a portable install).
+pub fn set_user_dictionary_path(path: PathBuf) {
+    if let Ok(mut p) = user_override().lock() {
+        *p = Some(path);
+    }
+    if let Ok(mut u) = user_state().lock() {
+        u.words = None;
+        u.generation += 1;
+    }
+}
+
+/// Bumped whenever the user dictionary changes, so cached results can be dropped.
+pub fn user_generation() -> u64 {
+    user_state().lock().map(|u| u.generation).unwrap_or(0)
+}
+
+fn with_user<T>(f: impl FnOnce(&HashSet<String>) -> T) -> Option<T> {
+    let mut u = user_state().lock().ok()?;
+    if u.words.is_none() {
+        let text = user_dictionary_path().and_then(|p| std::fs::read_to_string(p).ok()).unwrap_or_default();
+        u.words = Some(text.lines().map(str::trim).filter(|l| !l.is_empty() && !l.starts_with('#')).map(str::to_string).collect());
+    }
+    u.words.as_ref().map(f)
+}
+
+/// Add `word` to the user dictionary file (and to checks from now on).
+pub fn add_user_word(word: &str) -> std::io::Result<()> {
+    use std::io::Write;
+    let word = word.trim();
+    if word.is_empty() || word.contains(['\n', '\r']) {
+        return Err(std::io::Error::new(std::io::ErrorKind::InvalidInput, "not a word"));
+    }
+    if with_user(|u| u.contains(word)).unwrap_or(false) {
+        return Ok(());
+    }
+    let path = user_dictionary_path().ok_or_else(|| std::io::Error::new(std::io::ErrorKind::NotFound, "no folder for the user dictionary"))?;
+    if let Some(d) = path.parent() {
+        std::fs::create_dir_all(d)?;
+    }
+    let mut f = std::fs::OpenOptions::new().create(true).append(true).open(&path)?;
+    writeln!(f, "{word}")?;
+    if let Ok(mut u) = user_state().lock() {
+        if let Some(w) = u.words.as_mut() {
+            w.insert(word.to_string());
+        }
+        u.generation += 1;
+    }
+    Ok(())
+}
+
+/// Is `word` right: in the user dictionary (as written, or lower-case), else by `d`.
+pub fn is_correct(d: &Dictionary, word: &str) -> bool {
+    with_user(|u| u.contains(word) || u.contains(&word.to_lowercase())).unwrap_or(false) || d.check(word)
+}
+
+/// A word of a paragraph: its characters `start..end` (paragraph character offsets, as text
+/// positions count them) and the language of the run it starts in.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Word {
+    pub start: usize,
+    pub end: usize,
+    pub text: String,
+    pub lang: String,
+}
+
+/// The words of `p`, each with its run's language (`lang` on the run, else `default`). Words
+/// with digits are skipped; apostrophes inside a word belong to it; hyphenated words are checked
+/// part by part.
+pub fn paragraph_words(p: &deckcraft_model::Paragraph, default: &str) -> Vec<Word> {
+    let mut chars: Vec<(char, usize)> = vec![];
+    for (ri, r) in p.runs.iter().enumerate() {
+        chars.extend(r.content().chars().map(|c| (c, ri)));
+    }
+    let lang_of = |ri: usize| p.runs.get(ri).and_then(|r| r.props.lang.clone()).filter(|l| !l.is_empty()).unwrap_or_else(|| default.to_string());
+    let inside = |c: char| c.is_alphanumeric() || c == '\'' || c == '’' || c == '-';
+    let mut out = vec![];
+    let mut i = 0;
+    while i < chars.len() {
+        if !inside(chars[i].0) {
+            i += 1;
+            continue;
+        }
+        let start = i;
+        while i < chars.len() && inside(chars[i].0) {
+            i += 1;
+        }
+        let (mut a, mut b) = (start, i);
+        while a < b && !chars[a].0.is_alphanumeric() {
+            a += 1;
+        }
+        while b > a && !chars[b - 1].0.is_alphanumeric() {
+            b -= 1;
+        }
+        let text: String = chars[a..b].iter().map(|c| c.0).collect();
+        if text.is_empty() || text.chars().any(|c| c.is_ascii_digit()) || !text.chars().any(char::is_alphabetic) {
+            continue;
+        }
+        let mut k = a;
+        for part in text.split('-') {
+            let n = part.chars().count();
+            if !part.is_empty()
+                && let Some(c) = chars.get(k)
+            {
+                out.push(Word { start: k, end: k + n, text: part.to_string(), lang: lang_of(c.1) });
+            }
+            k += n + 1;
+        }
+    }
+    out
+}
+
+/// The misspelt words of `p`, each checked in its own language (languages with no dictionary
+/// installed are skipped), leaving out `ignore` (lower-case).
+pub fn misspelt(p: &deckcraft_model::Paragraph, default: &str, ignore: &[String]) -> Vec<Word> {
+    let mut dicts: HashMap<String, Option<Arc<Dictionary>>> = HashMap::new();
+    paragraph_words(p, default)
+        .into_iter()
+        .filter(|w| !ignore.contains(&w.text.to_lowercase()))
+        .filter(|w| {
+            let d = dicts.entry(w.lang.clone()).or_insert_with(|| dictionary(&w.lang));
+            d.as_ref().is_some_and(|d| !is_correct(d, &w.text))
+        })
+        .collect()
+}
+
 /// Use `d` for `lang` from now on in this process (a dictionary the app loaded itself).
 pub fn install(lang: &str, d: Dictionary) {
     if let Ok(mut c) = cache().lock() {
@@ -538,6 +766,43 @@ SFX D Y 1\nSFX D 0 ed/S .\n";
         assert!(d.suggest("workingslides", 5).contains(&"working slides".to_string()));
     }
 
+    #[test]
+    fn compounds_join_flagged_parts() {
+        let aff = "COMPOUNDFLAG X\nCOMPOUNDMIN 3\nONLYINCOMPOUND O\nSFX S Y 1\nSFX S 0 en .\n";
+        let d = Dictionary::parse(aff.as_bytes(), b"4\nhaus/X\ntuer/XS\nschluessel/X\nfugs/OX\n".as_slice());
+        for w in ["haustuer", "haustueren", "haustuerschluessel", "haus", "hausfugstuer"] {
+            assert!(d.check(w), "{w}");
+        }
+        for w in ["hausx", "fugs", "tuerhausz"] {
+            assert!(!d.check(w), "{w}");
+        }
+    }
+
+    #[test]
+    fn runs_give_words_their_language() {
+        use deckcraft_model::{Paragraph, Run, RunProps};
+        let p = Paragraph {
+            runs: vec![
+                Run::with("Hello wor", RunProps { lang: Some("en-GB".into()), ..Default::default() }),
+                Run::with("ld, Grüße well-known 3rd l'été", RunProps { lang: Some("de-DE".into()), ..Default::default() }),
+            ],
+            ..Default::default()
+        };
+        let w = paragraph_words(&p, "en-US");
+        let got: Vec<(&str, &str, usize)> = w.iter().map(|w| (w.text.as_str(), w.lang.as_str(), w.start)).collect();
+        assert_eq!(
+            got,
+            vec![
+                ("Hello", "en-GB", 0),
+                ("world", "en-GB", 6),
+                ("Grüße", "de-DE", 13),
+                ("well", "de-DE", 19),
+                ("known", "de-DE", 24),
+                ("l'été", "de-DE", 34)
+            ]
+        );
+    }
+
     #[test]
     fn long_and_numeric_flags_and_latin1() {
         let d = Dictionary::parse(b"FLAG long\nSFX Aa Y 1\nSFX Aa 0 s .\n", b"1\ncat/Aa\n");
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index f052d955..0e3884ac 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -871,3 +871,41 @@ fn spelling_without_a_dictionary_falls_back_to_common_misspellings() {
     assert!(d["found"].is_null());
     assert_eq!(d["available"], false);
 }
+
+#[test]
+fn spelling_checks_each_run_in_its_language_and_learns_words() {
+    let dir = std::env::temp_dir().join(format!("deckcraft-userdic-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    crate::spell::set_user_dictionary_path(dir.join("user.dic"));
+    crate::spell::install("xx-ONE", crate::spell::Dictionary::parse(b"", b"2\nhello\nworld\n"));
+    crate::spell::install("xx-TWO", crate::spell::Dictionary::parse(b"", b"2\nhallo\nwelt\n"));
+    let mut s = session();
+    let r = s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 300, 100], "text": "hello hallo deckcraft"})).unwrap();
+    let id = deckcraft_model::ShapeId(r["id"].as_u64().unwrap() as u32);
+    // The second word is in another language (as a PPTX run's `lang` gives it).
+    s.edit(|doc, _| {
+        let sh = deckcraft_model::find_shape_mut(&mut std::sync::Arc::make_mut(&mut doc.slides[0]).shapes, id).unwrap();
+        let p = &mut sh.text.as_mut().unwrap().paragraphs[0];
+        let t = p.runs[0].text.clone();
+        let props = p.runs[0].props.clone();
+        p.runs = vec![
+            deckcraft_model::Run::with(&t[..6], deckcraft_model::RunProps { lang: Some("xx-ONE".into()), ..props.clone() }),
+            deckcraft_model::Run::with(&t[6..12], deckcraft_model::RunProps { lang: Some("xx-TWO".into()), ..props.clone() }),
+            deckcraft_model::Run::with(&t[12..], deckcraft_model::RunProps { lang: Some("xx-ONE".into()), ..props }),
+        ];
+        Ok(())
+    })
+    .unwrap();
+    let v = s.execute("review.spelling", &json!({})).unwrap();
+    let words: Vec<_> = v
+        .as_array()
+        .unwrap()
+        .iter()
+        .map(|w| (w["word"].as_str().unwrap().to_string(), w["lang"].as_str().unwrap().to_string(), w["start"].as_u64().unwrap()))
+        .collect();
+    assert_eq!(words, vec![("deckcraft".to_string(), "xx-ONE".to_string(), 12)]);
+    s.execute("review.addToDictionary", &json!({"word": "deckcraft"})).unwrap();
+    assert!(s.execute("review.spelling", &json!({})).unwrap().as_array().unwrap().is_empty());
+    assert_eq!(std::fs::read_to_string(dir.join("user.dic")).unwrap(), "deckcraft\n");
+    let _ = std::fs::remove_dir_all(&dir);
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..3cd56b93 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -167,6 +167,12 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     ime_output(app, ui, xf);
     media_bar(app, ui, xf);
     gif_buttons(app, ui, xf, &gifs);
+    if resp.secondary_clicked()
+        && let Some(p) = resp.interact_pointer_pos()
+    {
+        let word = app.session.active().and_then(|st| app.squiggles.word_at(st, xf.to_slide(p), 4.0 / xf.scale.max(0.01) as f64));
+        app.squiggles.menu_word = word;
+    }
     context_menu(app, &resp);
 }
 
@@ -430,6 +436,14 @@ fn poly(p: &egui::Painter, pts: [Pos2; 4], stroke: Stroke) {
 }
 
 fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &Tokens) {
+    // Spelling squiggles under misspelt words (checked in the background).
+    if let Some(st) = app.session.active() {
+        let lines = app.squiggles.update(st, Some(ui.ctx()));
+        let scale = (xf.to_screen(Point::new(1.0, 0.0)) - xf.to_screen(Point::new(0.0, 0.0))).length();
+        for (a, b) in lines {
+            crate::squiggles::paint(painter, xf.to_screen(a), xf.to_screen(b), scale);
+        }
+    }
     let Some(st) = app.session.active() else { return };
     let sel_stroke = Stroke::new(1.0, t.selection);
     let editing = st.selection.text.clone();
@@ -622,6 +636,32 @@ fn draw_preview(app: &SlideApp, p: &egui::Painter, xf: Xf, x: Xfrm, t: &Tokens)
 
 fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
     resp.context_menu(|ui| {
+        // A misspelt word under the pointer: its suggestions, then Ignore All and Add to Dictionary.
+        if let Some(w) = app.squiggles.menu_word.clone() {
+            if w.suggestions.is_empty() {
+                ui.label(egui::RichText::new("(no spelling suggestions)").weak());
+            }
+            for to in &w.suggestions {
+                if ui.button(egui::RichText::new(to).strong()).clicked() {
+                    let _ = app.run("review.spellingChange", json!({"shape": w.shape, "para": w.para, "start": w.start, "word": w.word, "to": to}));
+                    app.squiggles.menu_word = None;
+                    ui.close();
+                }
+            }
+            if ui.button("Ignore All").clicked() {
+                app.squiggles.ignore(&w.word);
+                app.squiggles.menu_word = None;
+                ui.close();
+            }
+            if ui.button("Add to Dictionary").clicked() {
+                if let Err(e) = app.session.execute("review.addToDictionary", &json!({"word": w.word})) {
+                    app.set_status(e.to_string());
+                }
+                app.squiggles.menu_word = None;
+                ui.close();
+            }
+            ui.separator();
+        }
         let has_sel = app.session.active().is_some_and(|d| !d.selection.shapes.is_empty());
         for (l, id) in [("Cut", "edit.cut"), ("Copy", "edit.copy"), ("Paste", "edit.paste")] {
             if ui.add_enabled(crate::ribbon::enabled(app, id), egui::Button::new(l)).clicked() {
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index cca5dc5d..67f2826f 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -556,6 +556,11 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                         if ui.small_button("Ignore All").clicked() {
                             add_ignore = Some(w.to_string());
                         }
+                        if ui.small_button("Add to Dictionary").clicked()
+                            && let Err(e) = app.session.execute("review.addToDictionary", &json!({"word": w}))
+                        {
+                            app.set_status(e.to_string());
+                        }
                     });
                     let sug: Vec<String> = item
                         .get("suggestions")
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..db572078 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -20,6 +20,7 @@ pub mod ribbon;
 pub mod selpane;
 pub mod show;
 pub mod sorter;
+pub mod squiggles;
 pub mod status;
 pub mod textures;
 pub mod theme;
@@ -183,6 +184,8 @@ pub struct SlideApp {
     pub ui: UiState,
     pub textures: textures::Textures,
     pub control_rx: Option<Receiver<ControlRequest>>,
+    /// Spelling squiggles, checked on a worker thread.
+    pub squiggles: squiggles::Squiggles,
     pub dialog: Option<dialogs::Dialog>,
     pub show: Option<show::Show>,
     /// Audio/video playback (editor control bar, slide show, `media.*` commands).
@@ -238,6 +241,7 @@ impl SlideApp {
             ui: UiState::default(),
             textures: textures::Textures::default(),
             control_rx: None,
+            squiggles: Default::default(),
             dialog: None,
             show: None,
             media: media::MediaHost::new(audio_out),
diff --git a/crates/ui-egui/src/spelling_tests.rs b/crates/ui-egui/src/spelling_tests.rs
index 67e3ee64..7d9b5537 100644
--- a/crates/ui-egui/src/spelling_tests.rs
+++ b/crates/ui-egui/src/spelling_tests.rs
@@ -44,3 +44,72 @@ fn spelling_dialog_changes_and_ignores_words() {
     h.run_steps(3);
     assert!(h.query_by_label_contains("No issues found").is_some());
 }
+
+/// Misspelt words on the slide get squiggles from the background check; not the word being
+/// typed; the context menu's correction and Add to Dictionary clear them.
+#[test]
+fn squiggles_mark_misspelt_words_in_the_background() {
+    let aff = "SET UTF-8\nTRY esianrtolcdugmphbyfvkwzxjq\nSFX S Y 1\nSFX S 0 s .\n";
+    let dic = "7\nthe/S\nslide/S\nquarter/S\nplan/S\nour\nfor\nreview\n";
+    deckcraft_engine::spell::install("xx-SQ", deckcraft_engine::spell::Dictionary::parse(aff.as_bytes(), dic.as_bytes()));
+    let dir = std::env::temp_dir().join(format!("deckcraft-ui-userdic-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    deckcraft_engine::spell::set_user_dictionary_path(dir.join("user.dic"));
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.session.execute("slide.layout", &json!({"layout": "blank"})).ok();
+    let id = app
+        .session
+        .execute("shape.insert", &json!({"preset": "rect", "rect": [80, 120, 700, 160], "text": "Our plna for teh quarter reveiw"}))
+        .unwrap()["id"]
+        .as_u64()
+        .unwrap();
+    app.session.execute("format.size", &json!({"size": 40})).unwrap();
+    // Mark the runs' language directly (what a PPTX run's `lang` gives).
+    let sid = deckcraft_model::ShapeId(id as u32);
+    app.session
+        .edit(|doc, _| {
+            let sl = std::sync::Arc::make_mut(&mut doc.slides[0]);
+            let sh = deckcraft_model::find_shape_mut(&mut sl.shapes, sid).unwrap();
+            for r in sh.text.as_mut().unwrap().paragraphs.iter_mut().flat_map(|p| p.runs.iter_mut()) {
+                r.props.lang = Some("xx-SQ".into());
+            }
+            Ok(())
+        })
+        .unwrap();
+    app.session.execute("edit.select", &json!({"ids": []})).unwrap();
+    let st = app.session.active().unwrap().clone();
+    let lines = app.squiggles.settle(&st);
+    assert_eq!(lines.len(), 3, "{lines:?}");
+    let mut h = Harness::builder().with_size(egui::vec2(1100.0, 700.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(4);
+    if let (Ok(path), Ok(img)) = (std::env::var("DECKCRAFT_PNG_OUT_SQUIGGLES"), h.render()) {
+        let _ = img.save(path);
+    }
+    // The context menu's word under the first squiggle, and its correction.
+    let st = h.state().session.active().unwrap().clone();
+    let (a, _) = lines[0];
+    let w = h.state().squiggles.word_at(&st, deckcraft_geom::Point::new(a.x + 5.0, a.y - 5.0), 2.0).unwrap();
+    assert_eq!(w.word, "plna");
+    assert_eq!(w.suggestions.first().map(String::as_str), Some("plan"));
+    h.state_mut()
+        .session
+        .execute("review.spellingChange", &json!({"shape": id, "para": w.para, "start": w.start, "word": w.word, "to": "plan"}))
+        .unwrap();
+    h.state_mut().session.execute("review.addToDictionary", &json!({"word": "reveiw"})).unwrap();
+    let st = h.state().session.active().unwrap().clone();
+    assert_eq!(h.state_mut().squiggles.settle(&st).len(), 1);
+    // Typing at the end of a misspelt word: no squiggle under it until the caret leaves.
+    h.state_mut().session.execute("edit.select", &json!({"ids": [id]})).unwrap();
+    h.state_mut().session.execute("text.edit", &json!({})).unwrap();
+    h.state_mut().session.execute("text.select", &json!({"anchor": [0, 16], "caret": [0, 16]})).unwrap();
+    let st = h.state().session.active().unwrap().clone();
+    assert_eq!(st.selection.text.as_ref().map(|t| t.caret), Some((0, 16)));
+    assert_eq!(h.state_mut().squiggles.settle(&st).len(), 0, "the word being typed isn't marked");
+    let _ = std::fs::remove_dir_all(&dir);
+}
diff --git a/crates/ui-egui/src/squiggles.rs b/crates/ui-egui/src/squiggles.rs
new file mode 100644
index 00000000..17e55fdf
--- /dev/null
+++ b/crates/ui-egui/src/squiggles.rs
@@ -0,0 +1,260 @@
+//! Spelling squiggles: misspelt words on the current slide get a red wavy underline, checked on a
+//! worker thread so typing never waits for a dictionary. Results are for one version of the
+//! document; while a newer check runs, nothing stale is drawn. The word being typed (the caret at
+//! or inside it) isn't marked, as in PowerPoint. The web build has no worker and shows none.
+
+use std::collections::HashMap;
+use std::sync::Arc;
+use std::sync::mpsc::{Receiver, Sender, channel};
+
+use deckcraft_engine::DocState;
+use deckcraft_geom::Point;
+use deckcraft_model::{Paragraph, ShapeId};
+
+/// What a check is for: the document version, the slide and the user dictionary version.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct Key {
+    doc: usize,
+    rev: u64,
+    slide: usize,
+    user: u64,
+}
+
+struct Job {
+    key: Key,
+    default_lang: String,
+    paras: Vec<(ShapeId, usize, Paragraph)>,
+    repaint: Option<egui::Context>,
+}
+
+/// Misspelt ranges for one key: `(shape, para, start, end)`.
+struct Done {
+    key: Key,
+    ranges: Vec<(ShapeId, usize, usize, usize)>,
+}
+
+#[derive(Default)]
+pub struct Squiggles {
+    tx: Option<Sender<Job>>,
+    rx: Option<Receiver<Done>>,
+    /// The check in flight, if any.
+    pending: Option<Key>,
+    done: Option<Done>,
+    /// Underlines in slide coordinates for `done`, with each one's word: `(shape, para, start, end)`.
+    lines: Vec<((ShapeId, usize, usize, usize), Point, Point)>,
+    /// Off (tests or the setting).
+    pub disabled: bool,
+    /// The misspelt word a context menu is open on.
+    pub menu_word: Option<MenuWord>,
+    /// Words skipped with Ignore All this session (lower-case).
+    ignored: Vec<String>,
+}
+
+/// A misspelt word under the pointer, with corrections.
+#[derive(Clone, Debug)]
+pub struct MenuWord {
+    pub shape: ShapeId,
+    pub para: usize,
+    pub start: usize,
+    pub word: String,
+    pub suggestions: Vec<String>,
+}
+
+fn worker(rx: Receiver<Job>, tx: Sender<Done>) {
+    // Paragraph results by content, so typing in one paragraph re-checks only that one.
+    let mut cache: HashMap<(String, u64), Vec<(usize, usize)>> = HashMap::new();
+    let mut user = None;
+    while let Ok(mut job) = rx.recv() {
+        // Only the newest job matters.
+        while let Ok(j) = rx.try_recv() {
+            job = j;
+        }
+        if user != Some(job.key.user) {
+            cache.clear();
+            user = Some(job.key.user);
+        }
+        let mut ranges = vec![];
+        for (id, pi, p) in &job.paras {
+            let k = (serde_json::to_string(&p.runs).unwrap_or_default(), job.key.user);
+            let k = (format!("{}\u{0}{}", job.default_lang, k.0), k.1);
+            let r = cache
+                .entry(k)
+                .or_insert_with(|| deckcraft_engine::spell::misspelt(p, &job.default_lang, &[]).into_iter().map(|w| (w.start, w.end)).collect());
+            ranges.extend(r.iter().map(|(a, b)| (*id, *pi, *a, *b)));
+        }
+        if cache.len() > 20_000 {
+            cache.clear();
+        }
+        if tx.send(Done { key: job.key, ranges }).is_err() {
+            return;
+        }
+        if let Some(c) = &job.repaint {
+            c.request_repaint();
+        }
+    }
+}
+
+fn default_lang(st: &DocState) -> String {
+    for sl in &st.doc.slides {
+        let mut found = None;
+        deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
+            if found.is_none()
+                && let Some(t) = &sh.text
+            {
+                found = t.paragraphs.iter().flat_map(|p| &p.runs).find_map(|r| r.props.lang.clone());
+            }
+        });
+        if let Some(l) = found {
+            return l;
+        }
+    }
+    "en-US".into()
+}
+
+impl Squiggles {
+    fn start(&mut self) -> bool {
+        if self.tx.is_some() {
+            return true;
+        }
+        if cfg!(target_arch = "wasm32") {
+            return false;
+        }
+        let (jtx, jrx) = channel();
+        let (dtx, drx) = channel();
+        let ok = std::thread::Builder::new().name("spelling".into()).spawn(move || worker(jrx, dtx)).is_ok();
+        if ok {
+            self.tx = Some(jtx);
+            self.rx = Some(drx);
+        }
+        ok
+    }
+
+    /// Ask for a check of the current slide if it changed, take in finished checks, and return the
+    /// underlines to draw (slide coordinates).
+    pub fn update(&mut self, st: &DocState, repaint: Option<&egui::Context>) -> Vec<(Point, Point)> {
+        if self.disabled || !self.start() {
+            return vec![];
+        }
+        let key =
+            Key { doc: Arc::as_ptr(&st.doc) as usize, rev: st.revision, slide: st.selection.slide, user: deckcraft_engine::spell::user_generation() };
+        if let Some(rx) = &self.rx {
+            while let Ok(d) = rx.try_recv() {
+                if self.pending == Some(d.key) {
+                    self.pending = None;
+                }
+                self.lines.clear();
+                self.done = Some(d);
+                if let Some(d) = &self.done
+                    && d.key == key
+                {
+                    let mut by_shape: HashMap<ShapeId, Vec<(usize, usize, usize)>> = HashMap::new();
+                    for (id, p, a, b) in &d.ranges {
+                        by_shape.entry(*id).or_default().push((*p, *a, *b));
+                    }
+                    for (id, rs) in by_shape {
+                        for r in rs {
+                            for (a, b) in deckcraft_engine::cmd::text::range_underlines(st, id, &[r]) {
+                                self.lines.push(((id, r.0, r.1, r.2), a, b));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        let fresh = self.done.as_ref().is_some_and(|d| d.key == key);
+        if !fresh && self.pending != Some(key) {
+            let mut paras = vec![];
+            if let Some(sl) = st.doc.slides.get(st.selection.slide) {
+                deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
+                    if let Some(t) = &sh.text {
+                        for (i, p) in t.paragraphs.iter().enumerate() {
+                            paras.push((sh.id, i, p.clone()));
+                        }
+                    }
+                });
+            }
+            let job = Job { key, default_lang: default_lang(st), paras, repaint: repaint.cloned() };
+            if self.tx.as_ref().is_some_and(|tx| tx.send(job).is_ok()) {
+                self.pending = Some(key);
+            }
+        }
+        if !fresh {
+            return vec![];
+        }
+        // Not under the word the caret is in.
+        let typing = st.selection.text.as_ref().filter(|t| !t.notes && t.cell.is_none()).map(|t| (t.shape, t.caret));
+        self.lines
+            .iter()
+            .filter(|((id, p, a, b), _, _)| !typing.is_some_and(|(s, (cp, cc))| s == *id && cp == *p && cc >= *a && cc <= *b))
+            .filter(|((id, p, a, b), _, _)| {
+                self.ignored.is_empty() || {
+                    let w = st
+                        .shape(*id)
+                        .and_then(|sh| sh.text.as_ref()?.paragraphs.get(*p).map(|pp| pp.text().chars().skip(*a).take(b - a).collect::<String>()));
+                    !w.is_some_and(|w| self.ignored.contains(&w.to_lowercase()))
+                }
+            })
+            .map(|(_, a, b)| (*a, *b))
+            .collect()
+    }
+
+    /// Skip `word` everywhere for the rest of the session.
+    pub fn ignore(&mut self, word: &str) {
+        self.ignored.push(word.to_lowercase());
+    }
+
+    /// The squiggled word at slide point `p` (within `tol` points of its underline).
+    pub fn word_at(&self, st: &DocState, p: Point, tol: f64) -> Option<MenuWord> {
+        let ((shape, para, start, end), _, _) = *self.lines.iter().find(|(_, a, b)| {
+            let (x0, x1) = (a.x.min(b.x), a.x.max(b.x));
+            // From the line's top (a word is about a line high above its underline) to just below it.
+            p.x >= x0 - tol && p.x <= x1 + tol && p.y <= a.y.max(b.y) + tol && p.y >= a.y.min(b.y) - 24.0
+        })?;
+        let pp = st
+            .doc
+            .slides
+            .get(st.selection.slide)
+            .and_then(|sl| deckcraft_model::find_shape(&sl.shapes, shape))?
+            .text
+            .as_ref()?
+            .paragraphs
+            .get(para)?;
+        let word: String = pp.text().chars().skip(start).take(end - start).collect();
+        let lang = deckcraft_engine::spell::paragraph_words(pp, &default_lang(st)).into_iter().find(|w| w.start == start).map(|w| w.lang)?;
+        let suggestions = deckcraft_engine::spell::dictionary(&lang).map(|d| d.suggest(&word, 5)).unwrap_or_default();
+        Some(MenuWord { shape, para, start, word, suggestions })
+    }
+
+    /// Wait (tests) until the check for the current state is in.
+    pub fn settle(&mut self, st: &DocState) -> Vec<(Point, Point)> {
+        for _ in 0..500 {
+            let v = self.update(st, None);
+            if self.done.as_ref().is_some_and(|d| self.pending.is_none() && d.key.doc == Arc::as_ptr(&st.doc) as usize) {
+                return v;
+            }
+            std::thread::sleep(std::time::Duration::from_millis(2));
+        }
+        vec![]
+    }
+}
+
+/// A red wavy line from `a` to `b` (screen points).
+pub fn paint(painter: &egui::Painter, a: egui::Pos2, b: egui::Pos2, scale: f32) {
+    let d = b - a;
+    let len = d.length();
+    if len < 1.0 {
+        return;
+    }
+    let (u, n) = (d / len, egui::vec2(-d.y, d.x) / len);
+    let step = (2.0 * scale).clamp(1.5, 3.0);
+    let amp = step * 0.75;
+    let mut pts = vec![];
+    let mut t = 0.0;
+    let mut up = false;
+    while t <= len {
+        pts.push(a + u * t + n * if up { -amp } else { amp });
+        up = !up;
+        t += step;
+    }
+    painter.add(egui::Shape::line(pts, egui::Stroke::new(1.0, egui::Color32::from_rgb(0xE0, 0x20, 0x20))));
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index f965a5d6..3cc546cd 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -176,12 +176,14 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
 
 ### Proofing: spelling, thesaurus, AutoCorrect
 - **Evidence:** `review.spelling` checks with Hunspell-format dictionaries the system already has
-  (`crates/engine/src/spell.rs`: affixes, cross products, one level of continuation, case rules,
-  suggestions; no compounding) and the Spelling dialog changes or ignores words, but none ship with
-  DeckCraft, so without one installed (always on Windows and the web) only a short list of common
-  misspellings is found. No red squiggles while typing, no per-run language, no Add to Dictionary.
+  (`crates/engine/src/spell.rs`: affixes, cross products, one level of continuation, compounds,
+  case rules, suggestions), each run in its own language (`lang` from PPTX), with a user dictionary
+  for Add to Dictionary. Red squiggles on the current slide come from a worker thread, with a
+  context menu to correct, ignore or add. None ship with DeckCraft, so without one installed (always
+  on Windows and the web) only a short list of common misspellings is found, and the web build has
+  no squiggles. Notes and table cells aren't squiggled.
   Thesaurus (#549) and AutoCorrect (#521) have open PRs.
-- **Estimate:** 4–8 h (bundle openly licensed dictionaries, squiggles, custom dictionary, compounding).
+- **Estimate:** 2–4 h (bundle openly licensed dictionaries; squiggles in notes and table cells).
 
 ### Equations
 - **Evidence:** checklist row missing; PR #55 (OMML editor, +10.5k lines) is open.
@@ -260,6 +262,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Spelling squiggles while typing, Add to Dictionary, per-run languages and compounds |
 | 2026-10-14 | minor | Spelling checks with installed Hunspell dictionaries and suggests corrections |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |

From 00dd069678296a18c88efc3b5b0ee1492ac6c8e6 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:07:51 +0300
Subject: [PATCH 230/376] SmartArt: six more layouts, clear Venn labels, read
 back older Picture Accent Process files

Text Cycle, Continuous Cycle, Horizontal Hierarchy, Grid Matrix, Gear and Funnel. Venn labels sit further out, clear of the overlaps. Files where Picture Accent Process was written as pList2 (with DeckCraft's process-category layout part) import as Picture Accent Process again. Round shapes' text shrinks to the inscribed width.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/smartart.rs | 149 +++++++++++++++++++++++++++---
 crates/pptx/src/dgm.rs            |  58 ++++++++++--
 2 files changed, 185 insertions(+), 22 deletions(-)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index 6a533015..aa76b6e7 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -23,7 +23,7 @@ pub const MAX_LEVEL: u8 = 8;
 const MAX_SHAPES: usize = 40;
 
 /// DeckCraft's layouts, with the names PowerPoint's gallery gives them.
-pub const LAYOUTS: [(&str, &str); 22] = [
+pub const LAYOUTS: [(&str, &str); 28] = [
     ("list", "Vertical Bullet List"),
     ("blockList", "Basic Block List"),
     ("hBulletList", "Horizontal Bullet List"),
@@ -46,6 +46,12 @@ pub const LAYOUTS: [(&str, &str); 22] = [
     ("timeline", "Basic Timeline"),
     ("venn", "Basic Venn"),
     ("target", "Basic Target"),
+    ("textCycle", "Text Cycle"),
+    ("continuousCycle", "Continuous Cycle"),
+    ("horizontalHierarchy", "Horizontal Hierarchy"),
+    ("gridMatrix", "Grid Matrix"),
+    ("gear", "Gear"),
+    ("funnel", "Funnel"),
 ];
 /// SmartArt Styles.
 pub const STYLES: [(&str, &str); 9] = [
@@ -129,7 +135,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Change Layout",
             ["SmartArt Design", "Layouts"],
             None,
-            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess|pictureHList|timeline|venn|target}",
+            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess|pictureHList|timeline|venn|target|textCycle|continuousCycle|horizontalHierarchy|gridMatrix|gear|funnel}",
             has_selection,
             change_layout
         ),
@@ -508,8 +514,13 @@ const MIN_SCALE: f64 = 0.25;
 /// body's shrink-on-overflow autofit.
 fn fit_words(sh: &mut Shape) {
     let Some(w) = sh.xfrm.map(|x| x.w) else { return };
+    // Round shapes keep their text in the inscribed rectangle (about 71% of the width).
+    let text_w = match sh.geom.preset_name() {
+        Some("ellipse" | "gear6" | "gear9") => w * 0.71,
+        _ => w,
+    };
     let Some(body) = &mut sh.text else { return };
-    let avail = w - body.body.inset_l.unwrap_or(7.2) - body.body.inset_r.unwrap_or(7.2);
+    let avail = text_w - body.body.inset_l.unwrap_or(7.2) - body.body.inset_r.unwrap_or(7.2);
     let mut scale: f64 = 1.0;
     for p in &body.paragraphs {
         let line = avail - p.props.margin_left.unwrap_or(0.0).max(0.0);
@@ -572,7 +583,8 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
         out.push((sh, vec![]));
     };
     match d.kind.as_str() {
-        "hierarchy" => return hierarchy(d, area),
+        "hierarchy" => return hierarchy(d, area, false),
+        "horizontalHierarchy" => return hierarchy(d, area, true),
         "list" | "hBulletList" => {
             // Vertical / Horizontal Bullet List: a coloured title bar, sub-points in a pale box below.
             let vertical = d.kind == "list";
@@ -785,6 +797,108 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
                 }
             }
         }
+        "textCycle" | "continuousCycle" => {
+            // Text Cycle: the text alone around a circle, arrows between. Continuous Cycle: boxes on
+            // a ring.
+            let text_only = d.kind == "textCycle";
+            let r = area.h.min(area.w) * 0.36;
+            let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
+            let dd = (r * 0.8).min(2.0 * std::f64::consts::PI * r / nf * 0.62);
+            if !text_only {
+                let ring = r * 2.0 + dd * 0.3;
+                let mut sh = deco("donut", Xfrm::new(cx - ring / 2.0, cy - ring / 2.0, ring, ring), 0.0);
+                sh.geom = Geom::Preset { name: "donut".into(), adj: vec![7000.0] };
+                paint(d, &mut sh, 0, true);
+                out.push((sh, vec![]));
+            }
+            for (i, g) in gs.iter().enumerate() {
+                let a = (i as f64 / nf * 360.0 - 90.0).to_radians();
+                let (w, h) = (dd * 1.35, dd * 0.7);
+                let mut sh = text_shape("roundRect", Xfrm::new(cx + r * a.cos() - w / 2.0, cy + r * a.sin() - h / 2.0, w, h), &nodes(g), true);
+                paint(d, &mut sh, i, false);
+                if text_only {
+                    sh.fill = Some(Fill::None);
+                    sh.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+                    sh.effects = None;
+                    let c = ColorRef::scheme(accent(d, i)).with(ColorTransform::LumMod(75_000));
+                    if let Some(b) = &mut sh.text {
+                        for p in &mut b.paragraphs {
+                            for r in &mut p.runs {
+                                r.props.fill = Some(Fill::solid(c.clone()));
+                            }
+                        }
+                    }
+                    if n > 1 {
+                        let m = ((i as f64 + 0.5) / nf * 360.0 - 90.0).to_radians();
+                        let s = (dd * 0.3).max(6.0);
+                        arrow(
+                            &mut out,
+                            Xfrm::new(cx + r * m.cos() - s / 2.0, cy + r * m.sin() - s * 0.4, s, s * 0.8),
+                            (i as f64 + 0.5) / nf * 360.0,
+                            i,
+                        );
+                    }
+                }
+                out.push((sh, g.clone()));
+            }
+        }
+        "gridMatrix" => {
+            // Grid Matrix: four quadrants on crossed axes.
+            let s = area.h.min(area.w);
+            let (x0, y0) = (area.x + (area.w - s) / 2.0, area.y + (area.h - s) / 2.0);
+            let t = s * 0.06;
+            for (preset, x) in [("leftRightArrow", Xfrm::new(x0, y0 + (s - t) / 2.0, s, t)), ("upDownArrow", Xfrm::new(x0 + (s - t) / 2.0, y0, t, s))]
+            {
+                let mut sh = deco(preset, x, 0.0);
+                paint(d, &mut sh, 0, true);
+                out.push((sh, vec![]));
+            }
+            let q = s / 2.0 - t * 1.2;
+            for (i, g) in gs.iter().take(4).enumerate() {
+                let (c, r) = ((i % 2) as f64, (i / 2) as f64);
+                let x = Xfrm::new(x0 + c * (s / 2.0 + t * 0.7) + t * 0.5 * (1.0 - c), y0 + r * (s / 2.0 + t * 0.7) + t * 0.5 * (1.0 - r), q, q);
+                titled(&mut out, "rect", x, i, g);
+            }
+        }
+        "gear" => {
+            // Gear: up to three interlocking gears, the first the biggest.
+            let s = area.h.min(area.w * 0.62);
+            let (x0, y0) = (area.x + (area.w - s / 0.62) / 2.0, area.y + (area.h - s) / 2.0);
+            let spots = [(0.0, 0.18, 0.66, "gear9"), (0.5, 0.0, 0.48, "gear6"), (0.56, 0.48, 0.42, "gear6")];
+            for (i, g) in gs.iter().take(3).enumerate() {
+                let (fx, fy, fs, preset) = spots[i];
+                let z = s * fs;
+                titled(&mut out, preset, Xfrm::new(x0 + fx * s * 1.3, y0 + fy * s, z, z), i, g);
+            }
+        }
+        "funnel" => {
+            // Funnel: the ideas poured in at the top (up to three), the last one coming out below.
+            let s = area.h.min(area.w);
+            let (cx, y0) = (area.x + area.w / 2.0, area.y);
+            let fw = s * 0.8;
+            let fh = s * 0.62;
+            let mut f = deco("funnel", Xfrm::new(cx - fw / 2.0, y0, fw, fh), 0.0);
+            paint(d, &mut f, 0, true);
+            out.push((f, vec![]));
+            let (inside, last) = match gs.split_last() {
+                Some((l, r)) if !r.is_empty() => (r, Some(l)),
+                _ => (&gs[..], None),
+            };
+            let k = inside.len().min(3);
+            let dc = fw * 0.27;
+            let spots = [(0.0, 0.04), (-0.2, 0.3), (0.2, 0.3)];
+            for (i, g) in inside.iter().take(3).enumerate() {
+                let (dx, dy) = if k == 1 { (0.0, 0.15) } else { spots[i] };
+                titled(&mut out, "ellipse", Xfrm::new(cx + dx * fw - dc / 2.0, y0 + dy * fh + fh * 0.05, dc, dc), i, g);
+            }
+            if let Some(g) = last {
+                let a = s * 0.12;
+                let mut ar = deco("downArrow", Xfrm::new(cx - a / 2.0, y0 + fh, a, a * 1.2), 0.0);
+                paint(d, &mut ar, k, true);
+                out.push((ar, vec![]));
+                titled(&mut out, "roundRect", Xfrm::new(cx - fw * 0.35, y0 + fh + a * 1.3, fw * 0.7, (s - fh - a * 1.3).max(10.0)), k, g);
+            }
+        }
         "pictureHList" => {
             // Horizontal Picture List: a column per node, a big picture over its text.
             let w = area.w / nf;
@@ -843,7 +957,7 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
                 }
                 if let Some(b) = &mut sh.text {
                     // Text towards the circle's outer side, clear of the overlap.
-                    let p = dc * 0.18;
+                    let p = dc * 0.27;
                     let (dx, dy) = (a.cos() * p, a.sin() * p);
                     b.body.inset_l = Some((7.2 + dx).max(2.0));
                     b.body.inset_r = Some((7.2 - dx).max(2.0));
@@ -890,7 +1004,7 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
 }
 
 /// An organisation chart: one box per node, rows by level, each subtree as wide as its leaves.
-fn hierarchy(d: &Diagram, area: Xfrm) -> Vec<Item> {
+fn hierarchy(d: &Diagram, area: Xfrm, horizontal: bool) -> Vec<Item> {
     let nodes = &d.nodes[..d.nodes.len().min(MAX_SHAPES)];
     if nodes.is_empty() {
         return vec![];
@@ -922,9 +1036,11 @@ fn hierarchy(d: &Diagram, area: Xfrm) -> Vec<Item> {
         .collect();
     let rows = depth.iter().max().copied().unwrap_or(0) + 1;
     let total: usize = kids(None).iter().map(|&r| leaves[r]).sum::<usize>().max(1);
-    let cell_w = area.w / total as f64;
-    let row_h = area.h / rows as f64;
-    let (bw, bh) = (cell_w * 0.85, row_h * 0.6);
+    // Horizontal Hierarchy: the same tree turned a quarter, levels from left to right.
+    let (span, across) = if horizontal { (area.h, area.w) } else { (area.w, area.h) };
+    let cell_w = span / total as f64;
+    let row_h = across / rows as f64;
+    let (bw, bh) = if horizontal { (cell_w * 0.8, row_h * 0.7) } else { (cell_w * 0.85, row_h * 0.6) };
     // Left edge (in leaves) of each node's span.
     let mut left = vec![0usize; nodes.len()];
     let mut next_root = 0;
@@ -949,8 +1065,9 @@ fn hierarchy(d: &Diagram, area: Xfrm) -> Vec<Item> {
     }
     let boxes: Vec<Xfrm> = (0..nodes.len())
         .map(|i| {
-            let cx = area.x + (left[i] as f64 + leaves[i] as f64 / 2.0) * cell_w;
-            Xfrm::new(cx - bw / 2.0, area.y + depth[i] as f64 * row_h + (row_h - bh) / 2.0, bw, bh)
+            let c = (left[i] as f64 + leaves[i] as f64 / 2.0) * cell_w;
+            let r = depth[i] as f64 * row_h + (row_h - bh) / 2.0;
+            if horizontal { Xfrm::new(area.x + r, area.y + c - bw / 2.0, bh, bw) } else { Xfrm::new(area.x + c - bw / 2.0, area.y + r, bw, bh) }
         })
         .collect();
     let mut out: Vec<Item> = nodes
@@ -965,7 +1082,12 @@ fn hierarchy(d: &Diagram, area: Xfrm) -> Vec<Item> {
     for i in 0..nodes.len() {
         if let Some(p) = parent[i] {
             let (a, b) = (boxes[p], boxes[i]);
-            out.push((line_shape((a.x + a.w / 2.0, a.y + a.h), (b.x + b.w / 2.0, b.y)), vec![]));
+            let (p, q) = if horizontal {
+                ((a.x + a.w, a.y + a.h / 2.0), (b.x, b.y + b.h / 2.0))
+            } else {
+                ((a.x + a.w / 2.0, a.y + a.h), (b.x + b.w / 2.0, b.y))
+            };
+            out.push((line_shape(p, q), vec![]));
         }
     }
     out
@@ -1259,7 +1381,8 @@ mod tests {
                 let items = layout_items(&d, area);
                 let mut shown: Vec<usize> = items.iter().flat_map(|(_, m)| m.clone()).collect();
                 shown.sort_unstable();
-                let want: Vec<usize> = (0..6).collect();
+                // Gear draws three gears, as PowerPoint does: the fourth group isn't shown.
+                let want: Vec<usize> = (0..if kind == "gear" { 5 } else { 6 }).collect();
                 assert_eq!(shown, want, "{kind}");
                 for (sh, _) in &items {
                     let x = sh.xfrm.unwrap_or_default();
diff --git a/crates/pptx/src/dgm.rs b/crates/pptx/src/dgm.rs
index be5a280e..eff93b10 100644
--- a/crates/pptx/src/dgm.rs
+++ b/crates/pptx/src/dgm.rs
@@ -116,6 +116,12 @@ pub fn layout_id(kind: &str) -> &'static str {
         "timeline" => "urn:microsoft.com/office/officeart/2005/8/layout/hProcess11",
         "venn" => "urn:microsoft.com/office/officeart/2005/8/layout/venn1",
         "target" => "urn:microsoft.com/office/officeart/2005/8/layout/target1",
+        "textCycle" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle1",
+        "continuousCycle" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle3",
+        "horizontalHierarchy" => "urn:microsoft.com/office/officeart/2005/8/layout/hierarchy2",
+        "gridMatrix" => "urn:microsoft.com/office/officeart/2005/8/layout/matrix2",
+        "gear" => "urn:microsoft.com/office/officeart/2005/8/layout/gear1",
+        "funnel" => "urn:microsoft.com/office/officeart/2005/8/layout/funnel1",
         _ => "urn:microsoft.com/office/officeart/2005/8/layout/vList2",
     }
 }
@@ -123,6 +129,11 @@ pub fn layout_id(kind: &str) -> &'static str {
 /// The DeckCraft layout closest to a PowerPoint layout (by its id and category).
 pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
     let last = layout_id.rsplit('/').next().unwrap_or("").to_ascii_lowercase();
+    // DeckCraft before Picture Accent Process got its own id wrote it as pList2 (Horizontal
+    // Picture List) with its own layout part in the process category; PowerPoint's pList2 is a list.
+    if last == "plist2" && category.eq_ignore_ascii_case("process") {
+        return "pictureProcess";
+    }
     // Exact ids first: the layouts DeckCraft writes, and their closest siblings.
     for k in [
         "blockList",
@@ -146,6 +157,12 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         "timeline",
         "venn",
         "target",
+        "textCycle",
+        "continuousCycle",
+        "horizontalHierarchy",
+        "gridMatrix",
+        "gear",
+        "funnel",
         "list",
     ] {
         if layout_id == layout_id_of(k) {
@@ -153,7 +170,11 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         }
     }
     let s = format!("{last} {}", category.to_ascii_lowercase());
-    if s.contains("venn") {
+    if s.contains("gear") {
+        "gear"
+    } else if s.contains("funnel") {
+        "funnel"
+    } else if s.contains("venn") {
         "venn"
     } else if s.contains("target") {
         "target"
@@ -188,12 +209,12 @@ fn layout_id_of(kind: &str) -> &'static str {
 
 fn category(kind: &str) -> &'static str {
     match kind {
-        "process" | "chevron" | "verticalProcess" | "stepUp" | "pictureProcess" | "timeline" => "process",
+        "process" | "chevron" | "verticalProcess" | "stepUp" | "pictureProcess" | "timeline" | "gear" | "funnel" => "process",
         "venn" | "target" => "relationship",
-        "cycle" | "blockCycle" | "radial" => "cycle",
-        "hierarchy" => "hierarchy",
+        "cycle" | "blockCycle" | "radial" | "textCycle" | "continuousCycle" => "cycle",
+        "hierarchy" | "horizontalHierarchy" => "hierarchy",
         "pyramid" | "invertedPyramid" => "pyramid",
-        "matrix" | "titledMatrix" => "matrix",
+        "matrix" | "titledMatrix" | "gridMatrix" => "matrix",
         _ => "list",
     }
 }
@@ -411,12 +432,14 @@ fn alg(kind: &str) -> (&'static str, Vec<(&'static str, &'static str)>, &'static
         }
         "chevron" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "chevron"),
         "verticalProcess" => ("lin", vec![("linDir", "fromT"), ("nodeHorzAlign", "ctr")], "roundRect"),
-        "cycle" | "radial" | "venn" | "target" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse"),
+        "cycle" | "radial" | "venn" | "target" | "textCycle" | "continuousCycle" | "gear" => {
+            ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse")
+        }
         "blockCycle" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "roundRect"),
         "pyramid" | "invertedPyramid" => {
             ("pyra", vec![("linDir", if kind == "pyramid" { "fromT" } else { "fromB" }), ("txDir", "fromT"), ("pyraAcctPos", "bef")], "trapezoid")
         }
-        "matrix" | "titledMatrix" | "blockList" => (
+        "matrix" | "titledMatrix" | "gridMatrix" | "blockList" => (
             "snake",
             vec![("grDir", "tL"), ("flowDir", "row"), ("contDir", "sameDir"), ("off", "ctr")],
             if kind == "blockList" { "rect" } else { "roundRect" },
@@ -479,7 +502,7 @@ pub fn layout_xml(kind: &str) -> Vec<u8> {
     w.empty0("dgm:dir");
     w.empty("dgm:resizeHandles", A::new().a("val", "exact"));
     w.close("dgm:varLst");
-    if kind == "hierarchy" {
+    if matches!(kind, "hierarchy" | "horizontalHierarchy") {
         // Each node over the row of its children, recursively.
         w.empty("dgm:alg", A::new().a("type", "hierChild"));
         w.open("dgm:shape", A::new().a("r:blip", ""));
@@ -694,7 +717,24 @@ mod tests {
         assert!(String::from_utf8(style_xml("cartoon")).unwrap().contains("bevelT"));
         assert!(layout_id("pictureProcess").ends_with("/hProcess10"), "Picture Accent Process");
         assert!(layout_id("pictureHList").ends_with("/pList2"), "Horizontal Picture List");
-        for k in ["pictureList", "pictureCaption", "pictureProcess", "pictureHList", "timeline", "venn", "target"] {
+        // Picture Accent Process as an earlier DeckCraft wrote it (pList2, process category).
+        assert_eq!(kind_for("urn:microsoft.com/office/officeart/2005/8/layout/pList2", "process"), "pictureProcess");
+        assert_eq!(kind_for("urn:microsoft.com/office/officeart/2005/8/layout/pList2", "list"), "pictureHList");
+        for k in [
+            "pictureList",
+            "pictureCaption",
+            "pictureProcess",
+            "pictureHList",
+            "timeline",
+            "venn",
+            "target",
+            "textCycle",
+            "continuousCycle",
+            "horizontalHierarchy",
+            "gridMatrix",
+            "gear",
+            "funnel",
+        ] {
             assert_eq!(kind_for(layout_id(k), ""), k);
         }
     }

From eb7e346ea1f9b2865e3048b827e4c4aff96488a6 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:08:14 +0300
Subject: [PATCH 231/376] Text: underline an IME composition in a table cell

The preedit was already stored in the cell. It is now laid out the same
way the cell is drawn, and the editor underlines it in place, thicker
under the part being converted. The caret and the input method's
candidate window sit in that cell. Notes stay an egui text field.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                    |  4 ++-
 crates/engine/src/cmd/text.rs | 64 +++++++++++++++++++++++++++++++----
 crates/engine/src/tests.rs    | 35 +++++++++++++++++++
 crates/render/src/lib.rs      |  2 ++
 crates/render/src/table.rs    |  2 +-
 crates/ui-egui/src/canvas.rs  | 11 ++++++
 docs/gaps.md                  |  4 +--
 docs/localization-parity.md   |  8 +++--
 8 files changed, 116 insertions(+), 14 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..d17a18c4 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: IME underlines in table cells; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Text: an input method's composition in a table cell is underlined in place, with the caret and candidate window in that cell |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: IME underlines in table cells |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..6c6e127e 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -177,12 +177,18 @@ pub fn layout_for(st: &DocState, t: &TextSel) -> Option<deckcraft_text::TextLayo
 
 /// The insertion point on the slide: its line from top to bottom, in slide coordinates (flips and
 /// vertical text as drawn). Text with no paragraph yet (a placeholder about to be typed in) is
-/// measured as one empty paragraph, so the caret shows where typing begins. `None` for notes and
-/// table cells, which aren't laid out on the slide here.
+/// measured as one empty paragraph, so the caret shows where typing begins. `None` for notes,
+/// which are an egui text field.
 pub fn caret_line(st: &DocState, t: &TextSel) -> Option<(deckcraft_geom::Point, deckcraft_geom::Point)> {
-    if t.notes || t.cell.is_some() {
+    if t.notes {
         return None;
     }
+    if let Some((row, col)) = t.cell {
+        let placed = cell_on_slide(st, t.shape, row, col)?;
+        let aff = if t.at_line_end() { deckcraft_text::Affinity::Upstream } else { deckcraft_text::Affinity::Downstream };
+        let (cx, top, bot) = placed.layout.caret_drawn(deckcraft_text::Pos { para: t.caret.0, ch: t.caret.1 }, aff)?;
+        return Some((placed.to_slide * deckcraft_geom::Point::new(cx, top), placed.to_slide * deckcraft_geom::Point::new(cx, bot)));
+    }
     let sh = st.shape(t.shape)?;
     let ctx = ctx_for(&st.doc, &st.selection)?;
     let x = xfrm_of(&st.doc, &st.selection, sh);
@@ -483,20 +489,35 @@ fn commit(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 /// Underlines under an input method's composition (#101), in slide coordinates: `(from, to,
-/// thick)` per line, thick under the part being converted. Empty without a composition or when
-/// the edited text isn't laid out on the slide (notes, table cells).
+/// thick)` per line, thick under the part being converted. Empty without a composition, or for
+/// notes (an egui text field draws its own composition).
 pub fn composition_underlines(st: &DocState) -> Vec<(deckcraft_geom::Point, deckcraft_geom::Point, bool)> {
     let (Some(c), Some(t)) = (&st.composition, &st.selection.text) else { return vec![] };
+    if t.notes {
+        return vec![];
+    }
+    if let Some((row, col)) = t.cell {
+        let Some(placed) = cell_on_slide(st, t.shape, row, col) else { return vec![] };
+        return underline_segments(&placed.layout, placed.to_slide, c);
+    }
     let Some(sh) = st.shape(t.shape) else { return vec![] };
     let Some(l) = layout_for(st, t) else { return vec![] };
     let x = xfrm_of(&st.doc, &st.selection, sh);
     let tr = deckcraft_render::shape_geometry(sh, x.w, x.h).text_rect;
     let m = deckcraft_render::text_transform(x.affine(), tr, l.rotation);
+    underline_segments(&l, m, c)
+}
+
+fn underline_segments(
+    layout: &deckcraft_text::TextLayout,
+    to_slide: deckcraft_geom::Affine,
+    c: &crate::Composition,
+) -> Vec<(deckcraft_geom::Point, deckcraft_geom::Point, bool)> {
     let pos = |ch: usize| deckcraft_text::Pos { para: c.start.0, ch: c.start.1 + ch };
     let mut out = vec![];
     let mut add = |a: usize, b: usize, thick: bool| {
-        for (x0, x1, y) in l.composition_underlines(pos(a), pos(b)) {
-            out.push((m * deckcraft_geom::Point::new(x0, y), m * deckcraft_geom::Point::new(x1, y), thick));
+        for (x0, x1, y) in layout.composition_underlines(pos(a), pos(b)) {
+            out.push((to_slide * deckcraft_geom::Point::new(x0, y), to_slide * deckcraft_geom::Point::new(x1, y), thick));
         }
     };
     add(0, c.len, false);
@@ -506,6 +527,35 @@ pub fn composition_underlines(st: &DocState) -> Vec<(deckcraft_geom::Point, deck
     out
 }
 
+/// A table cell's text laid out the way it is drawn, mapped into slide coordinates.
+fn cell_on_slide(st: &DocState, id: ShapeId, row: usize, col: usize) -> Option<CellText> {
+    let sh = st.shape(id)?;
+    let ShapeKind::Table(tb) = &sh.kind else { return None };
+    let cell = tb.cell(row, col)?;
+    let ctx = ctx_for(&st.doc, &st.selection)?;
+    let heights = super::table_drawn_heights(&st.doc, &st.selection, tb);
+    let rect = deckcraft_render::table_cell_rects(tb, &heights).into_iter().find(|(r, c, _)| *r == row && *c == col)?.2;
+    let mut body = deckcraft_render::table_cell_body(&ctx, tb, row, col, cell);
+    if body.paragraphs.is_empty() {
+        body.paragraphs.push(deckcraft_model::text::Paragraph::default());
+    }
+    let tmp = deckcraft_model::Shape { text: Some(body.clone()), ..Default::default() };
+    let layout = deckcraft_text::layout(
+        &ctx,
+        &tmp,
+        &body,
+        &deckcraft_text::Opts { rect, fields: &deckcraft_text::NoFields, prompt_color: None, no_shrink: false },
+    );
+    let x = xfrm_of(&st.doc, &st.selection, sh);
+    let to_slide = deckcraft_render::text_transform(x.affine(), rect, layout.rotation);
+    Some(CellText { layout, to_slide })
+}
+
+struct CellText {
+    layout: deckcraft_text::TextLayout,
+    to_slide: deckcraft_geom::Affine,
+}
+
 fn insert(s: &mut Session, p: &Value) -> Result<Value> {
     let text = str_param(p, "text").ok_or_else(|| bad("text.insert", "missing `text`"))?.to_string();
     insert_text(s, &text, None)
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..0a82c7b1 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -775,6 +775,41 @@ fn ime_composition_underlines_follow_the_text() {
     assert!(cmd::text::composition_underlines(s.doc().unwrap()).is_empty());
 }
 
+/// #101: a composition in a table cell is underlined inside that cell, the same way slide text is.
+#[test]
+fn ime_composition_in_a_table_cell_is_underlined() {
+    let mut s = session();
+    let id = s.execute("insert.table", &json!({"rows": 2, "cols": 2, "rect": [80.0, 90.0, 400.0, 120.0]})).unwrap()["id"].as_u64().unwrap();
+    s.execute("text.edit", &json!({"id": id, "cell": [0, 0]})).unwrap();
+    assert!(cmd::text::composition_underlines(s.doc().unwrap()).is_empty());
+    let ts = s.doc().unwrap().selection.text.clone().unwrap();
+    assert!(cmd::text::caret_line(s.doc().unwrap(), &ts).is_some(), "the caret is in the cell");
+    s.compose_text("にほんご", Some((2, 4))).unwrap();
+    let u = cmd::text::composition_underlines(s.doc().unwrap());
+    let thin: Vec<_> = u.iter().filter(|x| !x.2).collect();
+    let thick: Vec<_> = u.iter().filter(|x| x.2).collect();
+    assert_eq!((thin.len(), thick.len()), (1, 1), "{u:?}");
+    let sh = s.doc().unwrap().shape(deckcraft_model::ShapeId(id as u32)).unwrap().clone();
+    let x = cmd::xfrm_of(&s.doc().unwrap().doc, &s.doc().unwrap().selection, &sh);
+    let deckcraft_model::ShapeKind::Table(tb) = &sh.kind else { panic!("not a table") };
+    let col = tb.cols[0];
+    let row = cmd::table_drawn_heights(&s.doc().unwrap().doc, &s.doc().unwrap().selection, tb)[0];
+    for (a, b, _) in &u {
+        assert!(b.x > a.x && (a.y - b.y).abs() < 1e-6, "a horizontal line: {a:?} {b:?}");
+        assert!(a.x >= x.x - 1.0 && b.x <= x.x + col + 1.0, "inside the first column");
+        assert!(a.y > x.y && a.y < x.y + row + 1.0, "inside the first row");
+    }
+    assert!(thick[0].0.x > thin[0].0.x && (thick[0].1.x - thin[0].1.x).abs() < 1e-6, "the converted part is the end");
+    let ts = s.doc().unwrap().selection.text.clone().unwrap();
+    let (top, bot) = cmd::text::caret_line(s.doc().unwrap(), &ts).unwrap();
+    assert!(top.x >= x.x && top.x <= x.x + col && top.y >= x.y && bot.y <= x.y + row + 1.0, "caret in the cell");
+    s.commit_text("日本語").unwrap();
+    assert!(cmd::text::composition_underlines(s.doc().unwrap()).is_empty());
+    let sh = s.doc().unwrap().shape(deckcraft_model::ShapeId(id as u32)).unwrap().clone();
+    let deckcraft_model::ShapeKind::Table(tb) = &sh.kind else { panic!("not a table") };
+    assert_eq!(tb.cell(0, 0).map(|c| c.text.text()), Some("日本語".into()));
+}
+
 /// File › Info (#76): the active presentation's name, location, counts and properties.
 #[test]
 fn file_info_reports_the_presentation() {
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..378c5a42 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -50,6 +50,8 @@ pub use images::{decode as decode_image, gif_frame};
 pub use morph_path::PathMorph;
 pub use morph_text::TextMorph;
 pub use placed::{Placed, PlacedLink, PlacedText, place_slide};
+pub use table::cell_body as table_cell_body;
+pub use table::cell_rects as table_cell_rects;
 pub use table::row_heights as table_row_heights;
 pub use transition::{SlideParts, composite_transition, render_transition};
 
diff --git a/crates/render/src/table.rs b/crates/render/src/table.rs
index c84e1172..4c8089b2 100644
--- a/crates/render/src/table.rs
+++ b/crates/render/src/table.rs
@@ -224,7 +224,7 @@ fn edges(sizes: &[f64]) -> Vec<f64> {
 }
 
 /// A cell's text as drawn: its margins, anchor and direction, plus the table style's text colour and bold.
-pub(crate) fn cell_body(rctx: &Ctx, t: &Table, r: usize, c: usize, cell: &Cell) -> TextBody {
+pub fn cell_body(rctx: &Ctx, t: &Table, r: usize, c: usize, cell: &Cell) -> TextBody {
     let lk = look(rctx, t, r, c);
     let mut body = cell.text.clone();
     let [ml, mr, mt, mb] = cell.margins.unwrap_or([7.2, 7.2, 3.6, 3.6]);
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..f0d7e8b7 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -528,6 +528,17 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
         let a = x.affine();
         let pts = [Point::new(x0, y0), Point::new(x0 + w, y0), Point::new(x0 + w, y0 + h), Point::new(x0, y0 + h)].map(|q| xf.to_screen(a * q));
         poly(painter, pts, Stroke::new(2.0, t.accent));
+        // The composition is in the cell text; underline it where that text is drawn (#101).
+        for (a, b, thick) in deckcraft_engine::cmd::text::composition_underlines(st) {
+            painter.line_segment([xf.to_screen(a), xf.to_screen(b)], Stroke::new(if thick { 2.0 } else { 1.0 }, t.caret));
+        }
+        if !ts.is_range() {
+            let blink = (ui.input(|i| i.time) * 1.6).fract() < 0.6;
+            ui.ctx().request_repaint_after(std::time::Duration::from_millis(300));
+            if blink && let Some((top, bot)) = deckcraft_engine::cmd::text::caret_line(st, ts) {
+                painter.line_segment([xf.to_screen(top), xf.to_screen(bot)], Stroke::new(1.5, t.caret));
+            }
+        }
     }
     // Smart guides, marquee, previews.
     for g in &app.session.tool.guides {
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..1ef81645 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (IME composition in a table cell is underlined; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -230,7 +230,6 @@ Detail in [localization-parity.md](localization-parity.md).
   (Noto CJK is excluded by the asset policy), so the web build draws Korean file names, notes and
   outline text as boxes; desktop borrows Malgun Gothic, Apple SD Gothic Neo or Noto Sans CJK.
   Adding an openly licensed Korean face (e.g. Nanum Gothic, OFL) to craft-fonts: 1–2 h.
-- **Table cells don't underline an IME composition** (the text is composed in place, #101). 1 h.
 - **UI isn't mirrored for right-to-left languages.** 6–10 h.
 - **Browser build draws Arabic and Hebrew as missing-glyph boxes in exports** (#81). 1–2 h.
 
@@ -256,6 +255,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | An IME composition in a table cell is underlined in place, and the caret and candidate window sit in that cell |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/localization-parity.md b/docs/localization-parity.md
index 3437cf53..f1cf8047 100644
--- a/docs/localization-parity.md
+++ b/docs/localization-parity.md
@@ -1,6 +1,6 @@
 # Localization parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (IME composition and CJK interface text, #101; previous: major, created; string count measured from source, PowerPoint's localizations read from its bundle) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (IME composition underlined in table cells; previous: minor, IME composition and CJK interface text, #101; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft's interface is English only today: strings are literals in the UI and engine code, with
 no catalog and no language switch. Requests: #15 (follow the system language), #30 and PR #34
@@ -44,8 +44,9 @@ Polish, Russian, Slovak, Swedish, Thai, Turkish and Traditional Chinese.
 Per-language hours assume the infrastructure exists: **8–14 h** once for a string catalog (copy a
 sibling app's approach, e.g. EffectCraft's menu and panel catalogs), a language setting that follows
 the system (#15), plural and number formatting, and an `xtask` check that every key has a
-translation. IME composition landed with #101 (slide text, notes and text fields; one undo step
-per composition); the hours that included it are kept until the next re-measure.
+translation. IME composition landed with #101 (slide text, table cells, notes and text fields;
+one undo step per composition, underlined in place); the hours that included it are kept until
+the next re-measure.
 
 ## Proofing languages
 
@@ -57,5 +58,6 @@ common misspellings (`crates/engine/src/cmd/review.rs`); see [gaps.md](gaps.md#p
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | IME composition in a table cell is underlined in place; the candidate window sits on that cell's caret |
 | 2026-10-12 | minor | IME composition for Chinese, Japanese and Korean, and interface text in any installed script (#101) |
 | 2026-10-10 | major | Created: twelve-language table, ~1,050 UI strings measured, PowerPoint for Mac's 26 languages from its bundle |

From 06c275d1363d9ec18a43c1e145b4d2faf5af551c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:15:42 +0300
Subject: [PATCH 232/376] Animations: check effect options and accept direction
 words

animation.add stored any `option` string as given, and the renderer reads
direction codes letter by letter, so "fromBottom" (r, t, b) flew in from the
bottom right. The option is now checked against the effect's list; direction
words ("fromBottom", "topLeft", "upRight") map to the stored codes ("b", "lt",
"ru"), and anything else is an error listing the valid options.
animation.options applies the option to each target in its own effect's terms
and leaves targets without such an option alone.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/animation.rs | 83 ++++++++++++++++++++++++++++--
 1 file changed, 79 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/cmd/animation.rs b/crates/engine/src/cmd/animation.rs
index 8b6fe5a7..dc6b9704 100644
--- a/crates/engine/src/cmd/animation.rs
+++ b/crates/engine/src/cmd/animation.rs
@@ -82,6 +82,51 @@ fn start_of(s: &str) -> AnimStart {
     }
 }
 
+/// The effect option `given` as one of `allowed`. Besides the stored codes ("b", "lt", "u", …)
+/// it takes the direction words people type: "fromBottom", "bottom", "fromTopLeft",
+/// "upRight". `None` when it matches none of them: the renderer reads direction codes letter
+/// by letter, so an unchecked "fromBottom" would fly in from the right and the bottom.
+fn resolve_option(allowed: &[&str], given: &str) -> Option<String> {
+    if allowed.is_empty() || allowed.contains(&given) {
+        return Some(given.to_string());
+    }
+    let low = given.to_ascii_lowercase();
+    if let Some(o) = allowed.iter().find(|o| o.to_ascii_lowercase() == low) {
+        return Some(o.to_string());
+    }
+    let mut rest = low.strip_prefix("from").unwrap_or(&low).trim_start_matches(['-', '_', ' ']);
+    // Direction words in order, each as both its edge letter and its arrow letter.
+    let mut dirs: Vec<(char, char)> = Vec::new();
+    while !rest.is_empty() {
+        let words: [(&str, (char, char)); 8] = [
+            ("bottom", ('b', 'd')),
+            ("down", ('b', 'd')),
+            ("top", ('t', 'u')),
+            ("up", ('t', 'u')),
+            ("left", ('l', 'l')),
+            ("right", ('r', 'r')),
+            ("-", ('-', '-')),
+            ("_", ('-', '-')),
+        ];
+        let (w, d) = words.iter().find(|(w, _)| rest.starts_with(w))?;
+        if d.0 != '-' {
+            dirs.push(*d);
+        }
+        rest = &rest[w.len()..];
+    }
+    if dirs.is_empty() || dirs.len() > 2 {
+        return None;
+    }
+    let mut cands: Vec<String> = Vec::new();
+    for pick in [|d: &(char, char)| d.0, |d: &(char, char)| d.1] {
+        let code: String = dirs.iter().map(pick).collect();
+        let rev: String = code.chars().rev().collect();
+        cands.push(code);
+        cands.push(rev);
+    }
+    cands.into_iter().find(|c| allowed.contains(&c.as_str()))
+}
+
 fn build(p: &Value) -> Result<Animation> {
     let effect = str_param(p, "effect").ok_or_else(|| bad("animation", "missing `effect`"))?;
     let class = class_of(str_param(p, "class"));
@@ -93,7 +138,12 @@ fn build(p: &Value) -> Result<Animation> {
     let mut a = Animation {
         class: info.2,
         effect: info.0.to_string(),
-        option: str_param(p, "option").map(String::from).or_else(|| info.5.first().map(|o| o.to_string())).unwrap_or_default(),
+        option: match str_param(p, "option") {
+            Some(o) => {
+                resolve_option(info.5, o).ok_or_else(|| bad("animation", format!("option `{o}` is not one of {:?} for `{}`", info.5, info.0)))?
+            }
+            None => info.5.first().map(|o| o.to_string()).unwrap_or_default(),
+        },
         duration_ms: p.get("duration").and_then(Value::as_u64).map(|v| v.min(600_000) as u32).unwrap_or(info.4),
         delay_ms: p.get("delay").and_then(Value::as_u64).map(|v| v.min(600_000) as u32).unwrap_or(0),
         preset_id: Some(info.3),
@@ -270,9 +320,14 @@ fn options(s: &mut Session, p: &Value) -> Result<Value> {
     });
     each_target(s, p, |a| {
         if let Some(o) = &option {
-            a.option = o.clone();
-            if a.class == AnimClass::Path {
-                a.path = Some(default_path(&a.effect, o));
+            // Each target takes the option in its own effect's terms; one it has no such
+            // option for keeps its own.
+            let allowed = animation_info(&a.effect, a.class).map(|i| i.5).unwrap_or(&[]);
+            if let Some(o) = resolve_option(allowed, o) {
+                if a.class == AnimClass::Path {
+                    a.path = Some(default_path(&a.effect, &o));
+                }
+                a.option = o;
             }
         }
         if let Some(b) = build_mode {
@@ -355,6 +410,26 @@ fn painter_apply(s: &mut Session, p: &Value) -> Result<Value> {
 
 #[cfg(test)]
 mod tests {
+    use super::resolve_option;
+
+    #[test]
+    fn direction_words_resolve_to_codes() {
+        let fly = &["b", "lb", "l", "lt", "t", "rt", "r", "rb"][..];
+        assert_eq!(resolve_option(fly, "fromBottom").as_deref(), Some("b"));
+        assert_eq!(resolve_option(fly, "bottom").as_deref(), Some("b"));
+        assert_eq!(resolve_option(fly, "fromTopLeft").as_deref(), Some("lt"));
+        assert_eq!(resolve_option(fly, "fromBottomRight").as_deref(), Some("rb"));
+        assert_eq!(resolve_option(fly, "lt").as_deref(), Some("lt"));
+        assert_eq!(resolve_option(fly, "sideways"), None);
+        assert_eq!(resolve_option(fly, "fromBottomTopLeft"), None);
+        let wipe = &["r", "l", "u", "d", "ru", "lu", "rd", "ld"][..];
+        assert_eq!(resolve_option(wipe, "fromBottom").as_deref(), Some("d"));
+        assert_eq!(resolve_option(wipe, "upRight").as_deref(), Some("ru"));
+        let split = &["horzIn", "horzOut", "vertIn", "vertOut"][..];
+        assert_eq!(resolve_option(split, "HorzIn").as_deref(), Some("horzIn"));
+        assert_eq!(resolve_option(&[], "anything").as_deref(), Some("anything"));
+    }
+
     use super::*;
 
     #[test]

From b4c03f0a75c2b635903e20c304bb4abbcd15b8b1 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:16:40 +0300
Subject: [PATCH 233/376] SmartArt: organisation charts with assistants,
 segmented and multidirectional cycles, cycle matrix, segmented pyramid, pie

Organization Chart and Half Circle Organization Chart with elbow connectors; assistant nodes (Add Assistant, written as asst points and read back) sit beside their parent on a row of their own. Segmented Cycle, Multidirectional Cycle, Cycle Matrix, Segmented Pyramid and Basic Pie. Venn labels move further out so the third circle's no longer runs into the overlap.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/smartart.rs | 308 +++++++++++++++++++++++++++++-
 crates/model/src/lib.rs           |   3 +
 crates/pptx/src/dgm.rs            |  84 ++++++--
 crates/ui-egui/src/ribbon.rs      |  10 +-
 4 files changed, 379 insertions(+), 26 deletions(-)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index aa76b6e7..cd3534be 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -23,7 +23,7 @@ pub const MAX_LEVEL: u8 = 8;
 const MAX_SHAPES: usize = 40;
 
 /// DeckCraft's layouts, with the names PowerPoint's gallery gives them.
-pub const LAYOUTS: [(&str, &str); 28] = [
+pub const LAYOUTS: [(&str, &str); 35] = [
     ("list", "Vertical Bullet List"),
     ("blockList", "Basic Block List"),
     ("hBulletList", "Horizontal Bullet List"),
@@ -52,6 +52,13 @@ pub const LAYOUTS: [(&str, &str); 28] = [
     ("gridMatrix", "Grid Matrix"),
     ("gear", "Gear"),
     ("funnel", "Funnel"),
+    ("segmentedCycle", "Segmented Cycle"),
+    ("multidirectionalCycle", "Multidirectional Cycle"),
+    ("orgChart", "Organization Chart"),
+    ("halfCircleOrgChart", "Half Circle Organization Chart"),
+    ("cycleMatrix", "Cycle Matrix"),
+    ("segmentedPyramid", "Segmented Pyramid"),
+    ("pie", "Basic Pie"),
 ];
 /// SmartArt Styles.
 pub const STYLES: [(&str, &str); 9] = [
@@ -115,7 +122,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Add Shape",
             ["SmartArt Design", "Create Graphic"],
             None,
-            "{id?, index?, position?: after|before|below|above, text?} → {index} (default: after the last node)",
+            "{id?, index?, position?: after|before|below|above|assistant, text?} → {index} (default: after the last node)",
             has_selection,
             add_node
         ),
@@ -135,7 +142,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Change Layout",
             ["SmartArt Design", "Layouts"],
             None,
-            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess|pictureHList|timeline|venn|target|textCycle|continuousCycle|horizontalHierarchy|gridMatrix|gear|funnel}",
+            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess|pictureHList|timeline|venn|target|textCycle|continuousCycle|horizontalHierarchy|gridMatrix|gear|funnel|segmentedCycle|multidirectionalCycle|orgChart|halfCircleOrgChart|cycleMatrix|segmentedPyramid|pie}",
             has_selection,
             change_layout
         ),
@@ -176,7 +183,7 @@ pub fn nodes_from_lines<'a>(lines: impl IntoIterator<Item = &'a str>) -> Vec<Dia
         .filter(|l| !l.trim().is_empty())
         .map(|l| {
             let tabs = l.chars().take_while(|c| *c == '\t').count();
-            DiagramNode { text: l.trim().to_string(), level: u8::try_from(tabs).unwrap_or(MAX_LEVEL).min(MAX_LEVEL), picture: None }
+            DiagramNode { text: l.trim().to_string(), level: u8::try_from(tabs).unwrap_or(MAX_LEVEL).min(MAX_LEVEL), picture: None, assistant: false }
         })
         .collect()
 }
@@ -208,7 +215,7 @@ fn subtree_end(nodes: &[DiagramNode], i: usize) -> usize {
 /// new node's index.
 pub fn add(nodes: &mut Vec<DiagramNode>, index: Option<usize>, position: &str, text: &str) -> usize {
     let Some(i) = index.filter(|i| *i < nodes.len()) else {
-        nodes.push(DiagramNode { text: text.into(), level: 0, picture: None });
+        nodes.push(DiagramNode { text: text.into(), level: 0, picture: None, assistant: false });
         return nodes.len() - 1;
     };
     let lv = nodes[i].level;
@@ -222,9 +229,10 @@ pub fn add(nodes: &mut Vec<DiagramNode>, index: Option<usize>, position: &str, t
             }
             (i, lv)
         }
+        "assistant" => (i + 1, (lv + 1).min(MAX_LEVEL)),
         _ => (subtree_end(nodes, i), lv),
     };
-    nodes.insert(at, DiagramNode { text: text.into(), level, picture: None });
+    nodes.insert(at, DiagramNode { text: text.into(), level, picture: None, assistant: position == "assistant" });
     at
 }
 
@@ -585,6 +593,7 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
     match d.kind.as_str() {
         "hierarchy" => return hierarchy(d, area, false),
         "horizontalHierarchy" => return hierarchy(d, area, true),
+        "orgChart" | "halfCircleOrgChart" => return org_chart(d, area, d.kind == "halfCircleOrgChart"),
         "list" | "hBulletList" => {
             // Vertical / Horizontal Bullet List: a coloured title bar, sub-points in a pale box below.
             let vertical = d.kind == "list";
@@ -842,6 +851,145 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
                 out.push((sh, g.clone()));
             }
         }
+        "segmentedCycle" | "pie" => {
+            // Segmented Cycle: a ring cut into one arc per node. Basic Pie: a disc cut into wedges.
+            // The text sits in a clear box over each segment's middle.
+            let ring = d.kind == "segmentedCycle";
+            let s = area.h.min(area.w);
+            let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
+            let gap = if ring { 2.0 } else { 0.0 };
+            for (i, g) in gs.iter().enumerate() {
+                // Angles clockwise from 3 o'clock, starting at the top.
+                let a0 = i as f64 / nf * 360.0 - 90.0 + gap / 2.0;
+                let a1 = (i as f64 + 1.0) / nf * 360.0 - 90.0 - gap / 2.0;
+                let mut sh = deco(if ring { "blockArc" } else { "pie" }, Xfrm::new(cx - s / 2.0, cy - s / 2.0, s, s), 0.0);
+                let ang = |a: f64| (a.rem_euclid(360.0) * 60_000.0).round();
+                // blockArc runs from its first angle to its second clockwise; so does pie.
+                sh.geom = Geom::Preset {
+                    name: if ring { "blockArc" } else { "pie" }.into(),
+                    adj: if ring { vec![ang(a0), ang(a1), 25_000.0] } else { vec![ang(a0), ang(a1)] },
+                };
+                paint(d, &mut sh, i, false);
+                out.push((sh, vec![]));
+                let m = ((a0 + a1) / 2.0).to_radians();
+                let rr = if ring { s * 0.4375 } else { s * 0.3 };
+                let tw = (s * if ring { 0.22 } else { 0.3 }).min(std::f64::consts::PI * 2.0 * rr / nf * 0.9);
+                let th = s * 0.16;
+                let mut t = text_shape("rect", Xfrm::new(cx + rr * m.cos() - tw / 2.0, cy + rr * m.sin() - th / 2.0, tw, th), &nodes(g), true);
+                paint(d, &mut t, i, false);
+                t.fill = Some(Fill::None);
+                t.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+                t.effects = None;
+                out.push((t, g.clone()));
+            }
+        }
+        "multidirectionalCycle" => {
+            // Multidirectional Cycle: nodes around a circle, double-headed arrows between them.
+            let r = area.h.min(area.w) * 0.36;
+            let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
+            let dd = (r * 0.75).min(2.0 * std::f64::consts::PI * r / nf * 0.55);
+            for (i, g) in gs.iter().enumerate() {
+                let a = (i as f64 / nf * 360.0 - 90.0).to_radians();
+                titled(&mut out, "roundRect", Xfrm::new(cx + r * a.cos() - dd * 0.65, cy + r * a.sin() - dd * 0.4, dd * 1.3, dd * 0.8), i, g);
+                if n > 1 {
+                    let m = ((i as f64 + 0.5) / nf * 360.0 - 90.0).to_radians();
+                    let s = (dd * 0.5).max(8.0);
+                    let mut sh = deco(
+                        "leftRightArrow",
+                        Xfrm::new(cx + r * m.cos() - s / 2.0, cy + r * m.sin() - s * 0.2, s, s * 0.4),
+                        (i as f64 + 0.5) / nf * 360.0,
+                    );
+                    paint(d, &mut sh, i, true);
+                    out.push((sh, vec![]));
+                }
+            }
+        }
+        "cycleMatrix" => {
+            // Cycle Matrix: four quarters of a circle in the middle with the top-level text, each
+            // quarter's sub-points in a box at its corner.
+            let s = area.h.min(area.w);
+            let (cx, cy) = (area.x + area.w / 2.0, area.y + area.h / 2.0);
+            let c = s * 0.56;
+            for (i, g) in gs.iter().take(4).enumerate() {
+                let (sx, sy) = ([-1.0, 1.0, 1.0, -1.0][i], [-1.0, -1.0, 1.0, 1.0][i]);
+                let b = s * 0.4;
+                let bx = Xfrm::new(cx + if sx < 0.0 { -s / 2.0 } else { s / 2.0 - b }, cy + if sy < 0.0 { -s / 2.0 } else { s / 2.0 - b }, b, b);
+                if g.len() > 1 {
+                    let mut sh = text_shape("roundRect", bx, &nodes(&g[1..]), false);
+                    paint(d, &mut sh, i, true);
+                    if let Some(body) = &mut sh.text {
+                        // Text in the box's outer part, clear of the circle.
+                        body.body.inset_l = Some(if sx > 0.0 { b * 0.35 } else { 6.0 });
+                        body.body.inset_r = Some(if sx < 0.0 { b * 0.35 } else { 6.0 });
+                        body.body.anchor = Some(if sy < 0.0 { deckcraft_model::text::Anchor::Top } else { deckcraft_model::text::Anchor::Bottom });
+                    }
+                    out.push((sh, g[1..].to_vec()));
+                }
+            }
+            for (i, g) in gs.iter().take(4).enumerate() {
+                let (sx, sy) = ([-1.0, 1.0, 1.0, -1.0][i], [-1.0, -1.0, 1.0, 1.0][i]);
+                let a0 = [180.0, 270.0, 0.0, 90.0][i] + 1.5;
+                let mut sh = deco("pie", Xfrm::new(cx - c / 2.0, cy - c / 2.0, c, c), 0.0);
+                sh.geom = Geom::Preset { name: "pie".into(), adj: vec![a0 * 60_000.0, (a0 + 87.0) * 60_000.0] };
+                paint(d, &mut sh, i, false);
+                out.push((sh, vec![]));
+                let q = c * 0.3;
+                let mut t = text_shape("rect", Xfrm::new(cx + sx * c * 0.2 - q / 2.0, cy + sy * c * 0.2 - q / 2.0, q, q), &nodes(&g[..1]), true);
+                paint(d, &mut t, i, false);
+                t.fill = Some(Fill::None);
+                t.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+                t.effects = None;
+                out.push((t, g[..1].to_vec()));
+            }
+        }
+        "segmentedPyramid" => {
+            // Segmented Pyramid: a triangle cut into rows of triangles (1, 3, 5, …), one per node,
+            // every other one upside down.
+            let rows = (nf.sqrt().ceil() as usize).max(1);
+            let s = area.h.min(area.w / 1.15);
+            let pw = s * 1.15;
+            let (x0, y0) = (area.x + (area.w - pw) / 2.0, area.y + (area.h - s) / 2.0);
+            let (tw, th) = (pw / rows as f64, s / rows as f64);
+            let mut k = 0;
+            'rows: for r in 0..rows {
+                let left = x0 + pw / 2.0 - (r as f64 + 1.0) * tw / 2.0;
+                for c in 0..(2 * r + 1) {
+                    let Some(g) = gs.get(k) else { break 'rows };
+                    let x = Xfrm::new(left + c as f64 * tw / 2.0, y0 + r as f64 * th, tw, th);
+                    let mut sh = text_shape("rect", x, &nodes(g), true);
+                    // Drawn as a polygon (not a flipped preset) so upside-down text stays upright.
+                    let path = if c % 2 == 1 {
+                        format!("M 0 0 L {tw:.2} 0 L {:.2} {th:.2} Z", tw / 2.0)
+                    } else {
+                        format!("M {:.2} 0 L {tw:.2} {th:.2} L 0 {th:.2} Z", tw / 2.0)
+                    };
+                    sh.geom = Geom::Custom {
+                        paths: vec![deckcraft_model::CustomPath {
+                            w: tw,
+                            h: th,
+                            d: path,
+                            fill: deckcraft_geom::preset::FillMode::Norm,
+                            stroke: true,
+                        }],
+                    };
+                    if let Some(b) = &mut sh.text {
+                        // The text in the triangle's wide half.
+                        b.body.inset_l = Some(tw * 0.22);
+                        b.body.inset_r = Some(tw * 0.22);
+                        if c % 2 == 1 {
+                            b.body.anchor = Some(deckcraft_model::text::Anchor::Top);
+                            b.body.inset_b = Some(th * 0.35);
+                        } else {
+                            b.body.anchor = Some(deckcraft_model::text::Anchor::Bottom);
+                            b.body.inset_t = Some(th * 0.35);
+                        }
+                    }
+                    paint(d, &mut sh, k, false);
+                    out.push((sh, g.clone()));
+                    k += 1;
+                }
+            }
+        }
         "gridMatrix" => {
             // Grid Matrix: four quadrants on crossed axes.
             let s = area.h.min(area.w);
@@ -957,7 +1105,7 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
                 }
                 if let Some(b) = &mut sh.text {
                     // Text towards the circle's outer side, clear of the overlap.
-                    let p = dc * 0.27;
+                    let p = dc * 0.36;
                     let (dx, dy) = (a.cos() * p, a.sin() * p);
                     b.body.inset_l = Some((7.2 + dx).max(2.0));
                     b.body.inset_r = Some((7.2 - dx).max(2.0));
@@ -1003,6 +1151,135 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
     out
 }
 
+/// Organization Chart: [`hierarchy`] with elbow connectors, and assistants beside their parent on
+/// a row of their own between the parent and its other children. `half_circle` draws each node as
+/// its text in an open half ring (Half Circle Organization Chart).
+fn org_chart(d: &Diagram, area: Xfrm, half_circle: bool) -> Vec<Item> {
+    let nodes = &d.nodes[..d.nodes.len().min(MAX_SHAPES)];
+    if nodes.is_empty() {
+        return vec![];
+    }
+    let mut parent: Vec<Option<usize>> = vec![None; nodes.len()];
+    let mut stack: Vec<usize> = vec![];
+    for (i, n) in nodes.iter().enumerate() {
+        while stack.last().is_some_and(|&p| nodes[p].level >= n.level) {
+            stack.pop();
+        }
+        parent[i] = stack.last().copied();
+        stack.push(i);
+    }
+    let asst = |i: usize| nodes[i].assistant && parent[i].is_some();
+    let kids = |i: Option<usize>| -> Vec<usize> { (0..nodes.len()).filter(|&k| parent[k] == i && !asst(k)).collect() };
+    let mut leaves = vec![0usize; nodes.len()];
+    for i in (0..nodes.len()).rev() {
+        let k = kids(Some(i));
+        leaves[i] = if k.is_empty() { 1 } else { k.iter().map(|&c| leaves[c]).sum() };
+    }
+    // Row slots: a node's level is 2 per depth; assistants take the odd slot under their parent.
+    let mut slot = vec![0usize; nodes.len()];
+    for i in 0..nodes.len() {
+        slot[i] = match parent[i] {
+            None => 0,
+            Some(p) if asst(i) => slot[p] + 1,
+            Some(p) => slot[p] + 2,
+        };
+    }
+    let mut used: Vec<usize> = slot.clone();
+    used.sort_unstable();
+    used.dedup();
+    let row = |i: usize| used.iter().position(|&s| s == slot[i]).unwrap_or(0);
+    let rows = used.len().max(1);
+    let total: usize = kids(None).iter().map(|&r| leaves[r]).sum::<usize>().max(1);
+    let cell_w = area.w / total as f64;
+    let row_h = area.h / rows as f64;
+    let (bw, bh) = ((cell_w * 0.85).min(area.w * 0.3), row_h * 0.62);
+    let mut left = vec![0usize; nodes.len()];
+    let mut next_root = 0;
+    for i in 0..nodes.len() {
+        if asst(i) {
+            continue;
+        }
+        let mut start = match parent[i] {
+            None => {
+                let s = next_root;
+                next_root += leaves[i];
+                s
+            }
+            Some(p) => left[p],
+        };
+        if let Some(p) = parent[i] {
+            for s in kids(Some(p)) {
+                if s == i {
+                    break;
+                }
+                start += leaves[s];
+            }
+        }
+        left[i] = start;
+    }
+    let mut side = vec![0usize; nodes.len()];
+    let boxes: Vec<Xfrm> = (0..nodes.len())
+        .map(|i| {
+            let y = area.y + row(i) as f64 * row_h + (row_h - bh) / 2.0;
+            match parent[i] {
+                Some(p) if asst(i) => {
+                    // Assistants alternate right and left of the parent's trunk.
+                    let k = (0..i).filter(|&j| parent[j] == Some(p) && asst(j)).count();
+                    side[i] = k;
+                    let pc = area.x + (left[p] as f64 + leaves[p] as f64 / 2.0) * cell_w;
+                    let off = bw * 0.15 + (k / 2) as f64 * bw * 1.1;
+                    let x = if k % 2 == 0 { pc + off } else { pc - off - bw };
+                    Xfrm::new(x.clamp(area.x, area.x + area.w - bw), y, bw, bh)
+                }
+                _ => {
+                    let cx = area.x + (left[i] as f64 + leaves[i] as f64 / 2.0) * cell_w;
+                    Xfrm::new(cx - bw / 2.0, y, bw, bh)
+                }
+            }
+        })
+        .collect();
+    let mut out: Vec<Item> = vec![];
+    for i in 0..nodes.len() {
+        let Some(p) = parent[i] else { continue };
+        let (a, b) = (boxes[p], boxes[i]);
+        let pc = a.x + a.w / 2.0;
+        if asst(i) {
+            let my = b.y + b.h / 2.0;
+            out.push((line_shape((pc, a.y + a.h), (pc, my)), vec![]));
+            let ex = if b.x > pc { b.x } else { b.x + b.w };
+            out.push((line_shape((pc, my), (ex, my)), vec![]));
+        } else {
+            let mid = b.y - (row_h - bh) / 2.0;
+            let cc = b.x + b.w / 2.0;
+            out.push((line_shape((pc, a.y + a.h), (pc, mid)), vec![]));
+            out.push((line_shape((pc.min(cc), mid), (pc.max(cc), mid)), vec![]));
+            out.push((line_shape((cc, mid), (cc, b.y)), vec![]));
+        }
+    }
+    let _ = side;
+    for (i, n) in nodes.iter().enumerate() {
+        let depth = slot[i] / 2;
+        if half_circle {
+            let s = boxes[i].h.min(boxes[i].w);
+            let x = boxes[i];
+            let mut arc = deco("blockArc", Xfrm::new(x.x + (x.w - s) / 2.0, x.y, s, s), 0.0);
+            arc.geom = Geom::Preset { name: "blockArc".into(), adj: vec![180.0 * 60_000.0, 0.0, 8_000.0] };
+            paint(d, &mut arc, depth, false);
+            out.push((arc, vec![]));
+            let mut t = text_shape("rect", x, &[n], true);
+            paint(d, &mut t, depth, true);
+            t.fill = Some(Fill::None);
+            t.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+            out.push((t, vec![i]));
+        } else {
+            let mut sh = text_shape("rect", boxes[i], &[n], true);
+            paint(d, &mut sh, depth, false);
+            out.push((sh, vec![i]));
+        }
+    }
+    out
+}
+
 /// An organisation chart: one box per node, rows by level, each subtree as wide as its leaves.
 fn hierarchy(d: &Diagram, area: Xfrm, horizontal: bool) -> Vec<Item> {
     let nodes = &d.nodes[..d.nodes.len().min(MAX_SHAPES)];
@@ -1167,7 +1444,7 @@ fn index(p: &Value, cmd: &str) -> Result<usize> {
 pub fn insert(s: &mut Session, kind: &str, mut nodes: Vec<DiagramNode>) -> Result<Value> {
     let kind = if is_kind(kind) { kind } else { "process" };
     if nodes.is_empty() {
-        nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0, picture: None }).collect();
+        nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0, picture: None, assistant: false }).collect();
     }
     normalize(&mut nodes);
     let d = Diagram { kind: kind.into(), nodes, ..Default::default() };
@@ -1316,7 +1593,7 @@ mod tests {
         n.iter().map(|x| x.level).collect()
     }
     fn mk(levels: &[u8]) -> Vec<DiagramNode> {
-        levels.iter().enumerate().map(|(i, l)| DiagramNode { text: format!("n{i}"), level: *l, picture: None }).collect()
+        levels.iter().enumerate().map(|(i, l)| DiagramNode { text: format!("n{i}"), level: *l, picture: None, assistant: false }).collect()
     }
 
     #[test]
@@ -1413,4 +1690,17 @@ mod tests {
         assert_eq!(accent(&d("accent3Grad"), 4), SchemeSlot::Accent3);
         assert!(shade(&d("accent3Grad"), 1).is_some() && shade(&d("accent3"), 1).is_none());
     }
+
+    #[test]
+    fn assistants_sit_beside_their_parent() {
+        let mut v = mk(&[0, 1, 1]);
+        let a = add(&mut v, Some(0), "assistant", "Aide");
+        assert_eq!((a, v[1].level, v[1].assistant), (1, 1, true));
+        let d = Diagram { kind: "orgChart".into(), nodes: v, ..Default::default() };
+        let items = layout_items(&d, Xfrm::new(0.0, 0.0, 600.0, 400.0));
+        let boxed = |k: usize| items.iter().find(|(_, m)| m == &vec![k]).and_then(|(s, _)| s.xfrm).unwrap_or_default();
+        let (ceo, aide, kid) = (boxed(0), boxed(1), boxed(2));
+        assert!(aide.y > ceo.y && aide.y < kid.y, "the assistant's row is between its parent and the children");
+        assert!(aide.x > ceo.x, "beside the parent's trunk");
+    }
 }
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 0d1afb9c..2d836397 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -365,6 +365,9 @@ pub struct DiagramNode {
     /// The picture shown in the node's picture placeholder (picture layouts).
     #[serde(skip_serializing_if = "Option::is_none")]
     pub picture: Option<MediaId>,
+    /// An assistant (organisation charts): drawn beside its parent, off the row of its siblings.
+    #[serde(skip_serializing_if = "std::ops::Not::not")]
+    pub assistant: bool,
 }
 
 impl Default for Shape {
diff --git a/crates/pptx/src/dgm.rs b/crates/pptx/src/dgm.rs
index eff93b10..90d1bedc 100644
--- a/crates/pptx/src/dgm.rs
+++ b/crates/pptx/src/dgm.rs
@@ -122,6 +122,13 @@ pub fn layout_id(kind: &str) -> &'static str {
         "gridMatrix" => "urn:microsoft.com/office/officeart/2005/8/layout/matrix2",
         "gear" => "urn:microsoft.com/office/officeart/2005/8/layout/gear1",
         "funnel" => "urn:microsoft.com/office/officeart/2005/8/layout/funnel1",
+        "segmentedCycle" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle8",
+        "multidirectionalCycle" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle7",
+        "orgChart" => "urn:microsoft.com/office/officeart/2005/8/layout/orgChart1",
+        "halfCircleOrgChart" => "urn:microsoft.com/office/officeart/2008/layout/HalfCircleOrganizationChart",
+        "cycleMatrix" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle4",
+        "segmentedPyramid" => "urn:microsoft.com/office/officeart/2005/8/layout/pyramid4",
+        "pie" => "urn:microsoft.com/office/officeart/2005/8/layout/chart3",
         _ => "urn:microsoft.com/office/officeart/2005/8/layout/vList2",
     }
 }
@@ -163,6 +170,13 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         "gridMatrix",
         "gear",
         "funnel",
+        "segmentedCycle",
+        "multidirectionalCycle",
+        "orgChart",
+        "halfCircleOrgChart",
+        "cycleMatrix",
+        "segmentedPyramid",
+        "pie",
         "list",
     ] {
         if layout_id == layout_id_of(k) {
@@ -180,7 +194,9 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         "target"
     } else if s.contains("timeline") {
         "timeline"
-    } else if s.contains("hierarchy") || s.contains("orgchart") {
+    } else if s.contains("orgchart") || s.contains("organizationchart") || s.contains("organizationalchart") {
+        "orgChart"
+    } else if s.contains("hierarchy") {
         "hierarchy"
     } else if s.contains("radial") {
         "radial"
@@ -211,9 +227,11 @@ fn category(kind: &str) -> &'static str {
     match kind {
         "process" | "chevron" | "verticalProcess" | "stepUp" | "pictureProcess" | "timeline" | "gear" | "funnel" => "process",
         "venn" | "target" => "relationship",
-        "cycle" | "blockCycle" | "radial" | "textCycle" | "continuousCycle" => "cycle",
-        "hierarchy" | "horizontalHierarchy" => "hierarchy",
-        "pyramid" | "invertedPyramid" => "pyramid",
+        "cycle" | "blockCycle" | "radial" | "textCycle" | "continuousCycle" | "segmentedCycle" | "multidirectionalCycle" | "cycleMatrix" | "pie" => {
+            "cycle"
+        }
+        "hierarchy" | "horizontalHierarchy" | "orgChart" | "halfCircleOrgChart" => "hierarchy",
+        "pyramid" | "invertedPyramid" | "segmentedPyramid" => "pyramid",
         "matrix" | "titledMatrix" | "gridMatrix" => "matrix",
         _ => "list",
     }
@@ -267,7 +285,11 @@ pub fn data_xml(d: &Diagram, seed: u32, drawing_rel: &str, pics: &[(usize, Strin
     // Node k: model id 1 + 3k; its link's parent and sibling transitions 2 + 3k and 3 + 3k.
     let node = |k: usize| guid(seed, 1 + 3 * k);
     for (k, n) in d.nodes.iter().enumerate() {
-        w.open("dgm:pt", A::new().a("modelId", node(k)));
+        let mut a = A::new().a("modelId", node(k));
+        if n.assistant {
+            a = a.a("type", "asst");
+        }
+        w.open("dgm:pt", a);
         w.empty("dgm:prSet", A::new().a("phldrT", "[Text]"));
         w.empty0("dgm:spPr");
         text(&mut w, &n.text);
@@ -367,14 +389,18 @@ pub fn node_pictures(data: &El) -> Vec<(usize, String)> {
 fn outline_ids(data: &El) -> Vec<(String, DiagramNode)> {
     let Some(pts) = data.child("ptLst") else { return vec![] };
     let mut texts: HashMap<&str, String> = HashMap::new();
+    let mut assistants: std::collections::HashSet<&str> = std::collections::HashSet::new();
     let mut doc: Option<&str> = None;
     for pt in pts.children_named("pt").take(MAX_NODES * 4) {
         let Some(id) = pt.attr("modelId") else { continue };
         match pt.attr("type").unwrap_or("node") {
             "doc" => doc = doc.or(Some(id)),
-            "node" => {
+            ty @ ("node" | "asst") => {
                 let t = pt.child("t").map(paragraphs).unwrap_or_default();
                 texts.insert(id, t);
+                if ty == "asst" {
+                    assistants.insert(id);
+                }
             }
             _ => {}
         }
@@ -403,7 +429,10 @@ fn outline_ids(data: &El) -> Vec<(String, DiagramNode)> {
         if out.len() >= MAX_NODES || !seen.insert(id) {
             continue;
         }
-        out.push((id.to_string(), DiagramNode { text: texts.get(id).cloned().unwrap_or_default(), level: level.min(8), picture: None }));
+        out.push((
+            id.to_string(),
+            DiagramNode { text: texts.get(id).cloned().unwrap_or_default(), level: level.min(8), picture: None, assistant: assistants.contains(id) },
+        ));
         if let Some(v) = kids.get(id) {
             stack.extend(v.iter().rev().map(|(_, c)| (*c, level.saturating_add(1))));
         }
@@ -432,11 +461,19 @@ fn alg(kind: &str) -> (&'static str, Vec<(&'static str, &'static str)>, &'static
         }
         "chevron" => ("lin", vec![("linDir", "fromL"), ("nodeVertAlign", "mid")], "chevron"),
         "verticalProcess" => ("lin", vec![("linDir", "fromT"), ("nodeHorzAlign", "ctr")], "roundRect"),
-        "cycle" | "radial" | "venn" | "target" | "textCycle" | "continuousCycle" | "gear" => {
-            ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse")
-        }
+        "cycle"
+        | "radial"
+        | "venn"
+        | "target"
+        | "textCycle"
+        | "continuousCycle"
+        | "gear"
+        | "segmentedCycle"
+        | "multidirectionalCycle"
+        | "cycleMatrix"
+        | "pie" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "ellipse"),
         "blockCycle" => ("cycle", vec![("stAng", "0"), ("spanAng", "360")], "roundRect"),
-        "pyramid" | "invertedPyramid" => {
+        "pyramid" | "invertedPyramid" | "segmentedPyramid" => {
             ("pyra", vec![("linDir", if kind == "pyramid" { "fromT" } else { "fromB" }), ("txDir", "fromT"), ("pyraAcctPos", "bef")], "trapezoid")
         }
         "matrix" | "titledMatrix" | "gridMatrix" | "blockList" => (
@@ -502,7 +539,7 @@ pub fn layout_xml(kind: &str) -> Vec<u8> {
     w.empty0("dgm:dir");
     w.empty("dgm:resizeHandles", A::new().a("val", "exact"));
     w.close("dgm:varLst");
-    if matches!(kind, "hierarchy" | "horizontalHierarchy") {
+    if matches!(kind, "hierarchy" | "horizontalHierarchy" | "orgChart" | "halfCircleOrgChart") {
         // Each node over the row of its children, recursively.
         w.empty("dgm:alg", A::new().a("type", "hierChild"));
         w.open("dgm:shape", A::new().a("r:blip", ""));
@@ -671,7 +708,7 @@ mod tests {
     use super::*;
 
     fn nodes(v: &[(&str, u8)]) -> Vec<DiagramNode> {
-        v.iter().map(|(t, l)| DiagramNode { text: (*t).into(), level: *l, picture: None }).collect()
+        v.iter().map(|(t, l)| DiagramNode { text: (*t).into(), level: *l, picture: None, assistant: false }).collect()
     }
 
     #[test]
@@ -698,6 +735,17 @@ mod tests {
         }
     }
 
+    #[test]
+    fn assistants_survive_the_data_model() {
+        let mut v = nodes(&[("CEO", 0), ("Aide", 1), ("CTO", 1)]);
+        v[1].assistant = true;
+        let d = Diagram { kind: "orgChart".into(), nodes: v, ..Default::default() };
+        let xml = data_xml(&d, 5, "rId1", &[]);
+        assert!(String::from_utf8(xml.clone()).unwrap().contains("type=\"asst\""));
+        let doc = crate::xml::parse(&xml).unwrap();
+        assert_eq!(outline(&doc.root), d.nodes);
+    }
+
     #[test]
     fn node_pictures_come_from_presentation_points() {
         let d = Diagram { kind: "pictureList".into(), nodes: nodes(&[("A", 0), ("a", 1), ("B", 0)]), ..Default::default() };
@@ -734,6 +782,13 @@ mod tests {
             "gridMatrix",
             "gear",
             "funnel",
+            "segmentedCycle",
+            "multidirectionalCycle",
+            "orgChart",
+            "halfCircleOrgChart",
+            "cycleMatrix",
+            "segmentedPyramid",
+            "pie",
         ] {
             assert_eq!(kind_for(layout_id(k), ""), k);
         }
@@ -744,7 +799,8 @@ mod tests {
         let xml = br#"<dgm:dataModel xmlns:dgm="d"><dgm:ptLst><dgm:pt modelId="0" type="doc"/><dgm:pt modelId="1"><dgm:t><a:p xmlns:a="a"><a:r><a:t>A</a:t></a:r></a:p></dgm:t></dgm:pt><dgm:pt modelId="2"/></dgm:ptLst><dgm:cxnLst><dgm:cxn srcId="0" destId="1"/><dgm:cxn srcId="1" destId="2"/><dgm:cxn srcId="2" destId="1"/><dgm:cxn type="presOf" srcId="0" destId="2"/></dgm:cxnLst></dgm:dataModel>"#;
         let doc = crate::xml::parse(xml).unwrap();
         assert_eq!(outline(&doc.root), nodes(&[("A", 0), ("", 1)]));
-        assert_eq!(kind_for("urn:microsoft.com/office/officeart/2005/8/layout/orgChart1", ""), "hierarchy");
+        assert_eq!(kind_for("urn:microsoft.com/office/officeart/2005/8/layout/orgChart1", ""), "orgChart");
+        assert_eq!(kind_for("urn:x/layout/NameandTitleOrganizationalChart", ""), "orgChart");
         assert_eq!(kind_for("urn:x/layout/chevron2", "process"), "chevron");
         assert_eq!(kind_for("urn:x/layout/hProcess9", "process"), "process");
         assert_eq!(kind_for("urn:x/layout/default", "list"), "blockList");
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 66706d18..f996a8dd 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2338,9 +2338,13 @@ fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
         rows(ui, |ui| {
             let (r, _) = small_button_ex(ui, Icon::Plus, "Add Shape", gid.is_some(), false, true);
             egui::Popup::menu(&r).show(|ui| {
-                for (label, pos) in
-                    [("Add Shape After", "after"), ("Add Shape Before", "before"), ("Add Shape Above", "above"), ("Add Shape Below", "below")]
-                {
+                for (label, pos) in [
+                    ("Add Shape After", "after"),
+                    ("Add Shape Before", "before"),
+                    ("Add Shape Above", "above"),
+                    ("Add Shape Below", "below"),
+                    ("Add Assistant", "assistant"),
+                ] {
                     if ui.button(label).clicked() {
                         let index = if n == 0 { Value::Null } else { json!(at) };
                         run(app, "smartArt.addNode", json!({"id": gid, "index": index, "position": pos}));

From 7764c27cc4012000adb2db63ea85f4b66c20705a Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:26:58 +0300
Subject: [PATCH 234/376] SmartArt: Name and Title org chart, closer Half
 Circle, ten more layouts, convert to and from text and shapes

Name and Title Organization Chart with a title box per node (DiagramNode.title, smartArt.setNodes title; written as the title box's presentation point text and read back). Half Circle Org Chart draws two half rings per node. New layouts: Vertical Box List, Trapezoid List, Table List, Accent Process, Continuous Block Process, Basic Bending Process, Linear Venn, Stacked Venn, Nested Target. smartArt.fromText (Convert to SmartArt), smartArt.toText and smartArt.toShapes, with a Convert menu in SmartArt Design.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/smartart.rs | 399 ++++++++++++++++++++++++++++--
 crates/engine/src/tests.rs        |  32 +++
 crates/model/src/lib.rs           |   3 +
 crates/pptx/src/dgm.rs            |  85 ++++++-
 crates/ui-egui/src/ribbon.rs      |   9 +
 5 files changed, 505 insertions(+), 23 deletions(-)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index cd3534be..70e0fa9a 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -23,7 +23,7 @@ pub const MAX_LEVEL: u8 = 8;
 const MAX_SHAPES: usize = 40;
 
 /// DeckCraft's layouts, with the names PowerPoint's gallery gives them.
-pub const LAYOUTS: [(&str, &str); 35] = [
+pub const LAYOUTS: [(&str, &str); 45] = [
     ("list", "Vertical Bullet List"),
     ("blockList", "Basic Block List"),
     ("hBulletList", "Horizontal Bullet List"),
@@ -59,6 +59,16 @@ pub const LAYOUTS: [(&str, &str); 35] = [
     ("cycleMatrix", "Cycle Matrix"),
     ("segmentedPyramid", "Segmented Pyramid"),
     ("pie", "Basic Pie"),
+    ("nameTitleOrgChart", "Name and Title Organization Chart"),
+    ("verticalBoxList", "Vertical Box List"),
+    ("trapezoidList", "Trapezoid List"),
+    ("tableList", "Table List"),
+    ("accentProcess", "Accent Process"),
+    ("continuousBlockProcess", "Continuous Block Process"),
+    ("bendingProcess", "Basic Bending Process"),
+    ("linearVenn", "Linear Venn"),
+    ("stackedVenn", "Stacked Venn"),
+    ("nestedTarget", "Nested Target"),
 ];
 /// SmartArt Styles.
 pub const STYLES: [(&str, &str); 9] = [
@@ -113,7 +123,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Edit SmartArt Text",
             ["SmartArt Design", "Create Graphic"],
             None,
-            "{id?, nodes?: [{text, level}], lines?: [string] (leading tabs set the level), index?, text?} (index + text edits one node)",
+            "{id?, nodes?: [{text, level}], lines?: [string] (leading tabs set the level), index?, text?, title?} (index + text edits one node; title: its Name and Title box)",
             has_selection,
             set_nodes
         ),
@@ -142,10 +152,37 @@ pub fn specs() -> Vec<CommandSpec> {
             "Change Layout",
             ["SmartArt Design", "Layouts"],
             None,
-            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess|pictureHList|timeline|venn|target|textCycle|continuousCycle|horizontalHierarchy|gridMatrix|gear|funnel|segmentedCycle|multidirectionalCycle|orgChart|halfCircleOrgChart|cycleMatrix|segmentedPyramid|pie}",
+            "{id?, kind: list|blockList|hBulletList|process|chevron|verticalProcess|stepUp|cycle|blockCycle|radial|hierarchy|pyramid|invertedPyramid|matrix|titledMatrix|pictureList|pictureCaption|pictureProcess|pictureHList|timeline|venn|target|textCycle|continuousCycle|horizontalHierarchy|gridMatrix|gear|funnel|segmentedCycle|multidirectionalCycle|orgChart|halfCircleOrgChart|cycleMatrix|segmentedPyramid|pie|nameTitleOrgChart|verticalBoxList|trapezoidList|tableList|accentProcess|continuousBlockProcess|bendingProcess|linearVenn|stackedVenn|nestedTarget}",
             has_selection,
             change_layout
         ),
+        cmd!(
+            "smartArt.fromText",
+            "Convert to SmartArt",
+            ["Home", "Paragraph"],
+            None,
+            "{id?, kind?} → {id} (a text box or placeholder becomes a SmartArt graphic in its place: one node per paragraph, indent levels kept)",
+            has_selection,
+            from_text
+        ),
+        cmd!(
+            "smartArt.toText",
+            "Convert to Text",
+            ["SmartArt Design", "Reset"],
+            None,
+            "{id?} → {id} (the graphic becomes a text box of its outline, bulleted by level)",
+            has_selection,
+            to_text
+        ),
+        cmd!(
+            "smartArt.toShapes",
+            "Convert to Shapes",
+            ["SmartArt Design", "Reset"],
+            None,
+            "{id?} (the graphic becomes a plain group of its shapes; the outline is dropped)",
+            has_selection,
+            to_shapes
+        ),
         cmd!(
             "smartArt.picture",
             "Insert Picture in SmartArt",
@@ -183,7 +220,13 @@ pub fn nodes_from_lines<'a>(lines: impl IntoIterator<Item = &'a str>) -> Vec<Dia
         .filter(|l| !l.trim().is_empty())
         .map(|l| {
             let tabs = l.chars().take_while(|c| *c == '\t').count();
-            DiagramNode { text: l.trim().to_string(), level: u8::try_from(tabs).unwrap_or(MAX_LEVEL).min(MAX_LEVEL), picture: None, assistant: false }
+            DiagramNode {
+                text: l.trim().to_string(),
+                level: u8::try_from(tabs).unwrap_or(MAX_LEVEL).min(MAX_LEVEL),
+                picture: None,
+                assistant: false,
+                title: String::new(),
+            }
         })
         .collect()
 }
@@ -215,7 +258,7 @@ fn subtree_end(nodes: &[DiagramNode], i: usize) -> usize {
 /// new node's index.
 pub fn add(nodes: &mut Vec<DiagramNode>, index: Option<usize>, position: &str, text: &str) -> usize {
     let Some(i) = index.filter(|i| *i < nodes.len()) else {
-        nodes.push(DiagramNode { text: text.into(), level: 0, picture: None, assistant: false });
+        nodes.push(DiagramNode { text: text.into(), level: 0, picture: None, assistant: false, title: String::new() });
         return nodes.len() - 1;
     };
     let lv = nodes[i].level;
@@ -232,7 +275,7 @@ pub fn add(nodes: &mut Vec<DiagramNode>, index: Option<usize>, position: &str, t
         "assistant" => (i + 1, (lv + 1).min(MAX_LEVEL)),
         _ => (subtree_end(nodes, i), lv),
     };
-    nodes.insert(at, DiagramNode { text: text.into(), level, picture: None, assistant: position == "assistant" });
+    nodes.insert(at, DiagramNode { text: text.into(), level, picture: None, assistant: position == "assistant", title: String::new() });
     at
 }
 
@@ -593,7 +636,7 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
     match d.kind.as_str() {
         "hierarchy" => return hierarchy(d, area, false),
         "horizontalHierarchy" => return hierarchy(d, area, true),
-        "orgChart" | "halfCircleOrgChart" => return org_chart(d, area, d.kind == "halfCircleOrgChart"),
+        "orgChart" | "halfCircleOrgChart" | "nameTitleOrgChart" => return org_chart(d, area),
         "list" | "hBulletList" => {
             // Vertical / Horizontal Bullet List: a coloured title bar, sub-points in a pale box below.
             let vertical = d.kind == "list";
@@ -990,6 +1033,176 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
                 }
             }
         }
+        "verticalBoxList" => {
+            // Vertical Box List: a pale box per node with its sub-points, its title on a tab
+            // overlapping the box's top left.
+            let h = area.h / nf;
+            for (i, g) in gs.iter().enumerate() {
+                let y = area.y + i as f64 * h;
+                let tab_h = (h * 0.3).min(40.0);
+                let mut bx = text_shape("rect", Xfrm::new(area.x, y + tab_h / 2.0, area.w, h * 0.9 - tab_h / 2.0), &nodes(&g[1..]), false);
+                paint(d, &mut bx, i, true);
+                if let Some(b) = &mut bx.text {
+                    b.body.inset_t = Some(tab_h * 0.6);
+                }
+                out.push((bx, g[1..].to_vec()));
+                titled(&mut out, "roundRect", Xfrm::new(area.x + area.w * 0.05, y, area.w * 0.6, tab_h), i, &g[..1]);
+            }
+        }
+        "trapezoidList" | "tableList" => {
+            // Trapezoid List: a column per node, each a trapezoid with its sub-points. Table List: the
+            // first node as a header bar over a column per other node.
+            let table = d.kind == "tableList";
+            let (head, cols): (Option<&Vec<usize>>, &[Vec<usize>]) =
+                if table { gs.split_first().map(|(h, r)| (Some(h), r)).unwrap_or((None, &[])) } else { (None, &gs) };
+            let top = if head.is_some() { area.h * 0.28 } else { 0.0 };
+            if let Some(h) = head {
+                titled(&mut out, "rect", Xfrm::new(area.x, area.y, area.w, top * 0.9), 0, h);
+            }
+            let m = cols.len().max(1) as f64;
+            let w = area.w / m;
+            for (k, g) in cols.iter().enumerate() {
+                let i = k + usize::from(table);
+                let x = Xfrm::new(area.x + k as f64 * w + w * 0.02, area.y + top, w * 0.96, area.h - top);
+                let mut sh = text_shape(if table { "rect" } else { "trapezoid" }, x, &nodes(g), true);
+                if let Some(b) = &mut sh.text {
+                    b.body.anchor = Some(deckcraft_model::text::Anchor::Top);
+                    if !table {
+                        b.body.inset_l = Some(x.w * 0.2);
+                        b.body.inset_r = Some(x.w * 0.2);
+                        b.body.inset_t = Some(x.h * 0.08);
+                    }
+                }
+                paint(d, &mut sh, i, table);
+                out.push((sh, g.clone()));
+            }
+        }
+        "accentProcess" => {
+            // Accent Process: a title box per step with its sub-points in a pale box below and to the
+            // right, arrows between the titles.
+            let gap = area.w * 0.05;
+            let w = (area.w - gap * (nf - 1.0)) / nf;
+            for (i, g) in gs.iter().enumerate() {
+                let x = area.x + i as f64 * (w + gap);
+                let th = area.h * 0.22;
+                if g.len() > 1 {
+                    let mut sh = text_shape("rect", Xfrm::new(x + w * 0.12, area.y + th * 0.7, w * 0.88, area.h - th * 0.7), &nodes(&g[1..]), false);
+                    paint(d, &mut sh, i, true);
+                    if let Some(b) = &mut sh.text {
+                        b.body.inset_t = Some(th * 0.45);
+                    }
+                    out.push((sh, g[1..].to_vec()));
+                }
+                titled(&mut out, "roundRect", Xfrm::new(x, area.y, w * 0.85, th), i, &g[..1]);
+                if i + 1 < n {
+                    let a = gap * 0.8;
+                    arrow(&mut out, Xfrm::new(x + w + (gap - a) / 2.0 - w * 0.07, area.y + th / 2.0 - a / 2.0, a, a), 0.0, i);
+                }
+            }
+        }
+        "continuousBlockProcess" => {
+            // Continuous Block Process: one big pale arrow behind a row of boxes.
+            let mut big = deco("rightArrow", Xfrm::new(area.x, area.y + area.h * 0.15, area.w, area.h * 0.7), 0.0);
+            paint(d, &mut big, 0, true);
+            out.push((big, vec![]));
+            let w = area.w * 0.85 / nf;
+            let h = area.h * 0.32;
+            for (i, g) in gs.iter().enumerate() {
+                let x = area.x + area.w * 0.02 + i as f64 * w;
+                titled(&mut out, "roundRect", Xfrm::new(x + w * 0.05, area.y + (area.h - h) / 2.0, w * 0.9, h), i, g);
+            }
+        }
+        "bendingProcess" => {
+            // Basic Bending Process: rows of boxes read left to right, wrapping, arrows between.
+            let cols = ((nf * area.w / area.h.max(1.0) / 1.5).sqrt().ceil() as usize).clamp(1, n);
+            let rows = n.div_ceil(cols);
+            let (cw, rh) = (area.w / cols as f64, area.h / rows as f64);
+            let (bw, bh) = (cw * 0.72, (rh * 0.75).min(cw * 0.72 * 0.6));
+            for (i, g) in gs.iter().enumerate() {
+                let (c, r) = (i % cols, i / cols);
+                let x = area.x + c as f64 * cw;
+                let y = area.y + r as f64 * rh + (rh - bh) / 2.0;
+                titled(&mut out, "rect", Xfrm::new(x, y, bw, bh), i, g);
+                if i + 1 < n {
+                    let a = (cw - bw) * 0.7;
+                    if c + 1 < cols {
+                        arrow(&mut out, Xfrm::new(x + bw + (cw - bw - a) / 2.0, y + bh / 2.0 - a / 2.0, a, a), 0.0, i);
+                    } else {
+                        // The bend: down from the row's last box towards the next row's first.
+                        let a = (rh - bh).min(a * 1.5).max(6.0);
+                        arrow(&mut out, Xfrm::new(x + bw / 2.0 - a / 2.0, y + bh + (rh - bh - a) / 2.0, a, a), 90.0, i);
+                    }
+                }
+            }
+        }
+        "linearVenn" | "stackedVenn" => {
+            // Linear Venn: overlapping circles in a row. Stacked Venn: circles nested from the bottom,
+            // the text near each one's top.
+            let linear = d.kind == "linearVenn";
+            if linear {
+                let dc = (area.w / (nf * 0.75 + 0.25)).min(area.h);
+                let step = dc * 0.75;
+                let x0 = area.x + (area.w - (step * (nf - 1.0) + dc)) / 2.0;
+                for (i, g) in gs.iter().enumerate() {
+                    let mut sh = text_shape("ellipse", Xfrm::new(x0 + i as f64 * step, area.y + (area.h - dc) / 2.0, dc, dc), &nodes(g), true);
+                    paint(d, &mut sh, i, false);
+                    if let Some(Fill::Solid { color: c }) = &mut sh.fill {
+                        *c = c.clone().with(ColorTransform::Alpha(55_000));
+                    }
+                    out.push((sh, g.clone()));
+                }
+            } else {
+                let s = area.h.min(area.w);
+                let (cx, bottom) = (area.x + area.w / 2.0, area.y + (area.h + s) / 2.0);
+                for (i, _) in gs.iter().enumerate() {
+                    let dc = s * (1.0 - i as f64 / nf);
+                    let mut sh = deco("ellipse", Xfrm::new(cx - dc / 2.0, bottom - dc, dc, dc), 0.0);
+                    paint(d, &mut sh, i, false);
+                    out.push((sh, vec![]));
+                }
+                // Each circle's text in the band between its top and the next circle's.
+                let band = s / nf;
+                for (i, g) in gs.iter().enumerate() {
+                    let dc = s * (1.0 - i as f64 / nf);
+                    let top = bottom - dc;
+                    let h = if i + 1 < n { band } else { dc };
+                    let w = dc * if i + 1 < n { 0.6 } else { 0.7 };
+                    let mut t =
+                        text_shape("rect", Xfrm::new(cx - w / 2.0, top + if i + 1 < n { band * 0.05 } else { 0.0 }, w, h * 0.9), &nodes(g), true);
+                    paint(d, &mut t, i, false);
+                    t.fill = Some(Fill::None);
+                    t.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+                    t.effects = None;
+                    out.push((t, g.clone()));
+                }
+            }
+        }
+        "nestedTarget" => {
+            // Nested Target: rounded boxes nested inside each other, the text on each one's top band.
+            let band_x = area.w / 2.0 / nf * 0.6;
+            let band_y = area.h / nf * 0.9 / 2.0;
+            for (i, _) in gs.iter().enumerate() {
+                let (dx, dy) = (band_x * i as f64, band_y * i as f64);
+                let mut sh = deco("roundRect", Xfrm::new(area.x + dx, area.y + dy, area.w - 2.0 * dx, area.h - 2.0 * dy), 0.0);
+                paint(d, &mut sh, i, false);
+                out.push((sh, vec![]));
+            }
+            for (i, g) in gs.iter().enumerate() {
+                let (dx, dy) = (band_x * i as f64, band_y * i as f64);
+                let h = if i + 1 < n { band_y } else { area.h - 2.0 * dy };
+                let mut t = text_shape(
+                    "rect",
+                    Xfrm::new(area.x + dx + band_x * 0.3, area.y + dy, (area.w - 2.0 * dx - band_x * 0.6).max(1.0), h),
+                    &nodes(g),
+                    true,
+                );
+                paint(d, &mut t, i, false);
+                t.fill = Some(Fill::None);
+                t.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+                t.effects = None;
+                out.push((t, g.clone()));
+            }
+        }
         "gridMatrix" => {
             // Grid Matrix: four quadrants on crossed axes.
             let s = area.h.min(area.w);
@@ -1154,7 +1367,9 @@ fn layout_raw(d: &Diagram, area: Xfrm) -> Vec<Item> {
 /// Organization Chart: [`hierarchy`] with elbow connectors, and assistants beside their parent on
 /// a row of their own between the parent and its other children. `half_circle` draws each node as
 /// its text in an open half ring (Half Circle Organization Chart).
-fn org_chart(d: &Diagram, area: Xfrm, half_circle: bool) -> Vec<Item> {
+fn org_chart(d: &Diagram, area: Xfrm) -> Vec<Item> {
+    let half_circle = d.kind == "halfCircleOrgChart";
+    let name_title = d.kind == "nameTitleOrgChart";
     let nodes = &d.nodes[..d.nodes.len().min(MAX_SHAPES)];
     if nodes.is_empty() {
         return vec![];
@@ -1260,21 +1475,51 @@ fn org_chart(d: &Diagram, area: Xfrm, half_circle: bool) -> Vec<Item> {
     for (i, n) in nodes.iter().enumerate() {
         let depth = slot[i] / 2;
         if half_circle {
-            let s = boxes[i].h.min(boxes[i].w);
+            // Two half rings round the text: the upper left one in the accent, the lower right one
+            // in its tint.
             let x = boxes[i];
-            let mut arc = deco("blockArc", Xfrm::new(x.x + (x.w - s) / 2.0, x.y, s, s), 0.0);
-            arc.geom = Geom::Preset { name: "blockArc".into(), adj: vec![180.0 * 60_000.0, 0.0, 8_000.0] };
-            paint(d, &mut arc, depth, false);
-            out.push((arc, vec![]));
+            for (k, (a0, a1)) in [(140.0, 310.0), (320.0, 130.0)].into_iter().enumerate() {
+                let mut arc = deco("blockArc", x, 0.0);
+                arc.geom = Geom::Preset { name: "blockArc".into(), adj: vec![a0 * 60_000.0, a1 * 60_000.0, 4_000.0] };
+                paint(d, &mut arc, depth, false);
+                if k == 1 {
+                    let c = ColorRef::scheme(accent(d, depth)).with(ColorTransform::LumMod(60_000)).with(ColorTransform::LumOff(40_000));
+                    arc.fill = Some(Fill::solid(c));
+                }
+                arc.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+                arc.effects = None;
+                out.push((arc, vec![]));
+            }
             let mut t = text_shape("rect", x, &[n], true);
             paint(d, &mut t, depth, true);
             t.fill = Some(Fill::None);
             t.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
             out.push((t, vec![i]));
         } else {
-            let mut sh = text_shape("rect", boxes[i], &[n], true);
+            let mut x = boxes[i];
+            if name_title {
+                // The name in the upper part; the title box overlaps the lower edge.
+                x.h *= 0.85;
+            }
+            let mut sh = text_shape("rect", x, &[n], true);
             paint(d, &mut sh, depth, false);
             out.push((sh, vec![i]));
+            if name_title {
+                let tb = Xfrm::new(x.x + x.w * 0.12, x.y + x.h * 0.72, x.w * 0.8, x.h * 0.42);
+                let title = DiagramNode { text: n.title.clone(), ..Default::default() };
+                let mut t = text_shape("rect", tb, &[&title], true);
+                paint(d, &mut t, depth, true);
+                t.fill = Some(Fill::solid(ColorRef::scheme(SchemeSlot::Lt1)));
+                if let Some(b) = &mut t.text {
+                    for p in &mut b.paragraphs {
+                        for r in &mut p.runs {
+                            r.props.size = Some(11.0);
+                        }
+                        p.end_props.size = Some(11.0);
+                    }
+                }
+                out.push((t, vec![]));
+            }
         }
     }
     out
@@ -1444,7 +1689,7 @@ fn index(p: &Value, cmd: &str) -> Result<usize> {
 pub fn insert(s: &mut Session, kind: &str, mut nodes: Vec<DiagramNode>) -> Result<Value> {
     let kind = if is_kind(kind) { kind } else { "process" };
     if nodes.is_empty() {
-        nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0, picture: None, assistant: false }).collect();
+        nodes = (0..3).map(|_| DiagramNode { text: "Text".into(), level: 0, picture: None, assistant: false, title: String::new() }).collect();
     }
     normalize(&mut nodes);
     let d = Diagram { kind: kind.into(), nodes, ..Default::default() };
@@ -1488,6 +1733,7 @@ fn set_nodes(s: &mut Session, p: &Value) -> Result<Value> {
     };
     let one = p.get("index").map(|_| index(p, CMD)).transpose()?;
     let text = str_param(p, "text").map(String::from);
+    let title = str_param(p, "title").map(String::from);
     edit_diagram(s, p, CMD, |d| {
         if let Some(n) = given {
             d.nodes = n;
@@ -1495,6 +1741,9 @@ fn set_nodes(s: &mut Session, p: &Value) -> Result<Value> {
         if let (Some(i), Some(t)) = (one, text) {
             d.nodes.get_mut(i).ok_or_else(|| bad(CMD, "no such node"))?.text = t;
         }
+        if let (Some(i), Some(t)) = (one, title) {
+            d.nodes.get_mut(i).ok_or_else(|| bad(CMD, "no such node"))?.title = t;
+        }
         Ok(Value::Null)
     })
 }
@@ -1527,6 +1776,120 @@ fn demote(s: &mut Session, p: &Value) -> Result<Value> {
     edit_diagram(s, p, CMD, |d| if demote_node(&mut d.nodes, i) { Ok(Value::Null) } else { Err(bad(CMD, "nothing above to demote under")) })
 }
 
+/// Convert to SmartArt: the selected text shape's paragraphs become the nodes of a new graphic in
+/// the shape's place.
+fn from_text(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.fromText";
+    let kind = str_param(p, "kind").filter(|k| is_kind(k)).unwrap_or("list").to_string();
+    let id = *targets(s, p)?.first().ok_or_else(|| bad(CMD, "select a text box"))?;
+    let (area, nodes) = {
+        let st = s.doc()?;
+        let shapes = current_shapes(&st.doc, &st.selection).ok_or_else(|| bad(CMD, "no slide"))?;
+        let sh = shapes.iter().find(|x| x.id == id).ok_or_else(|| bad(CMD, "select a text box on the slide"))?;
+        let body =
+            sh.text.as_ref().filter(|b| b.paragraphs.iter().any(|p| !p.text().trim().is_empty())).ok_or_else(|| bad(CMD, "the shape has no text"))?;
+        let mut nodes: Vec<DiagramNode> = body
+            .paragraphs
+            .iter()
+            .filter(|p| !p.text().trim().is_empty())
+            .map(|p| DiagramNode { text: p.text().trim().to_string(), level: p.level.min(MAX_LEVEL), ..Default::default() })
+            .collect();
+        normalize(&mut nodes);
+        // A small text box grows to a size a diagram can use, keeping its top left on the slide.
+        let mut a = xfrm_of(&st.doc, &st.selection, sh);
+        let size = st.doc.slide_size;
+        a.w = a.w.max(size.width * 0.5).min(size.width);
+        a.h = a.h.max(size.height * 0.35).min(size.height);
+        a.x = a.x.min(size.width - a.w).max(0.0);
+        a.y = a.y.min(size.height - a.h).max(0.0);
+        a.rot = 0.0;
+        (a, nodes)
+    };
+    let d = Diagram { kind: kind.clone(), nodes, ..Default::default() };
+    let gid = s.edit(|doc, sel| {
+        let children = regenerate(doc, &d, area);
+        let gid = ShapeId(doc.alloc_id());
+        let g = Shape {
+            id: gid,
+            name: format!("SmartArt ({kind})"),
+            xfrm: Some(area),
+            kind: ShapeKind::Group { children, child: area },
+            diagram: Some(d),
+            ..Default::default()
+        };
+        let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad(CMD, "no slide"))?;
+        let at = shapes.iter().position(|x| x.id == id).ok_or_else(|| bad(CMD, "no such shape"))?;
+        // In the text shape's place in the z-order.
+        shapes[at] = g;
+        sel.shapes = vec![gid];
+        sel.text = None;
+        Ok(gid)
+    })?;
+    Ok(json!({"id": gid.0}))
+}
+
+/// Convert to Text: a text box with the outline, one bulleted paragraph per node.
+fn to_text(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.toText";
+    let gid = target_group(s, p, CMD)?;
+    let (_, d) = selected_for(s, gid).ok_or_else(|| bad(CMD, "select a SmartArt graphic"))?;
+    let new = s.edit(|doc, sel| {
+        let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad(CMD, "no slide"))?;
+        let at = shapes.iter().position(|x| x.id == gid).ok_or_else(|| bad(CMD, "the graphic isn't at the top of the slide"))?;
+        let area = shapes[at].xfrm.unwrap_or_default();
+        let mut body = TextBody::default();
+        for n in &d.nodes {
+            let mut para = Paragraph::new(&n.text);
+            para.level = n.level.min(MAX_LEVEL);
+            para.props.bullet = Some(deckcraft_model::text::Bullet::Char { char: "•".into() });
+            para.props.margin_left = Some(18.0 * (para.level as f64 + 1.0));
+            para.props.indent = Some(-14.0);
+            body.paragraphs.push(para);
+        }
+        if body.paragraphs.is_empty() {
+            body.paragraphs.push(Paragraph::new(""));
+        }
+        body.body.wrap = Some(true);
+        body.body.autofit = Some(AutoFit::Shrink { font_scale: 1.0, line_reduction: 0.0 });
+        let id = ShapeId(doc.alloc_id());
+        let tb =
+            Shape { id, name: "Text".into(), xfrm: Some(area), text_box: true, text: Some(body), geom: Geom::preset("rect"), ..Default::default() };
+        let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad(CMD, "no slide"))?;
+        shapes[at] = tb;
+        sel.shapes = vec![id];
+        sel.text = None;
+        Ok(id)
+    })?;
+    Ok(json!({"id": new.0}))
+}
+
+/// Convert to Shapes: keep the drawing as an ordinary group.
+fn to_shapes(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "smartArt.toShapes";
+    let gid = target_group(s, p, CMD)?;
+    s.edit(|doc, sel| {
+        let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad(CMD, "no slide"))?;
+        let g = deckcraft_model::find_shape_mut(shapes, gid).ok_or_else(|| bad(CMD, "no such shape"))?;
+        g.diagram = None;
+        g.name = "Group".into();
+        sel.shapes = vec![gid];
+        Ok(())
+    })?;
+    Ok(Value::Null)
+}
+
+/// The graphic `gid` with its outline (typed text synced).
+fn selected_for(s: &Session, gid: ShapeId) -> Option<(ShapeId, Diagram)> {
+    let st = s.doc().ok()?;
+    let shapes = current_shapes(&st.doc, &st.selection)?;
+    let g = diagram_group(shapes, gid)?;
+    let mut d = g.diagram.clone()?;
+    if let ShapeKind::Group { children, .. } = &g.kind {
+        sync_text(&mut d, children);
+    }
+    Some((g.id, d))
+}
+
 fn set_picture(s: &mut Session, p: &Value) -> Result<Value> {
     const CMD: &str = "smartArt.picture";
     let i = index(p, CMD)?;
@@ -1593,7 +1956,11 @@ mod tests {
         n.iter().map(|x| x.level).collect()
     }
     fn mk(levels: &[u8]) -> Vec<DiagramNode> {
-        levels.iter().enumerate().map(|(i, l)| DiagramNode { text: format!("n{i}"), level: *l, picture: None, assistant: false }).collect()
+        levels
+            .iter()
+            .enumerate()
+            .map(|(i, l)| DiagramNode { text: format!("n{i}"), level: *l, picture: None, assistant: false, title: String::new() })
+            .collect()
     }
 
     #[test]
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e75b25a8..ac033837 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -975,3 +975,35 @@ fn smartart_pictures_3d_styles_and_colour_variants() {
         assert_eq!((d.style.as_str(), d.colors.as_str()), (style, colors));
     }
 }
+
+#[test]
+fn smartart_converts_to_and_from_text_and_shapes() {
+    let mut s = session();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.textBox", &json!({"text": "Goals\nRevenue\nGrowth"})).unwrap();
+    let before = s.doc().unwrap().doc.slides[1].shapes.len();
+    let gid = s.execute("smartArt.fromText", &json!({"kind": "blockList"})).unwrap()["id"].as_u64().unwrap();
+    let st = s.doc().unwrap();
+    assert_eq!(st.doc.slides[1].shapes.len(), before, "the text box is replaced, not added to");
+    let d = st.doc.slides[1].shapes.iter().find_map(|x| x.diagram.clone()).unwrap();
+    assert_eq!(d.nodes.iter().map(|n| n.text.as_str()).collect::<Vec<_>>(), ["Goals", "Revenue", "Growth"]);
+
+    // Name and Title: titles show in their own box and survive a .pptx round trip.
+    s.execute("smartArt.layout", &json!({"id": gid, "kind": "nameTitleOrgChart"})).unwrap();
+    s.execute("smartArt.setNodes", &json!({"id": gid, "index": 0, "title": "Lead"})).unwrap();
+    let back = deckcraft_pptx::import(&deckcraft_pptx::export(s.doc().unwrap().doc.as_ref()).unwrap()).unwrap();
+    let bd = back.slides[1].shapes.iter().find_map(|x| x.diagram.clone()).unwrap();
+    assert_eq!((bd.kind.as_str(), bd.nodes[0].title.as_str()), ("nameTitleOrgChart", "Lead"));
+
+    let tid = s.execute("smartArt.toText", &json!({"id": gid})).unwrap()["id"].as_u64().unwrap();
+    let st = s.doc().unwrap();
+    let tb = st.doc.slides[1].shapes.iter().find(|x| x.id.0 as u64 == tid).unwrap();
+    assert!(tb.diagram.is_none());
+    assert_eq!(tb.text.as_ref().unwrap().paragraphs.len(), 3);
+
+    s.execute("edit.undo", &json!({})).unwrap();
+    s.execute("smartArt.toShapes", &json!({"id": gid})).unwrap();
+    let st = s.doc().unwrap();
+    let g = st.doc.slides[1].shapes.iter().find(|x| x.id.0 as u64 == gid).unwrap();
+    assert!(g.diagram.is_none() && !g.children().is_empty(), "a plain group of the same shapes");
+}
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 2d836397..bad27088 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -368,6 +368,9 @@ pub struct DiagramNode {
     /// An assistant (organisation charts): drawn beside its parent, off the row of its siblings.
     #[serde(skip_serializing_if = "std::ops::Not::not")]
     pub assistant: bool,
+    /// The job title under the name (Name and Title Organization Chart).
+    #[serde(skip_serializing_if = "String::is_empty")]
+    pub title: String,
 }
 
 impl Default for Shape {
diff --git a/crates/pptx/src/dgm.rs b/crates/pptx/src/dgm.rs
index 90d1bedc..5f85db00 100644
--- a/crates/pptx/src/dgm.rs
+++ b/crates/pptx/src/dgm.rs
@@ -126,6 +126,16 @@ pub fn layout_id(kind: &str) -> &'static str {
         "multidirectionalCycle" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle7",
         "orgChart" => "urn:microsoft.com/office/officeart/2005/8/layout/orgChart1",
         "halfCircleOrgChart" => "urn:microsoft.com/office/officeart/2008/layout/HalfCircleOrganizationChart",
+        "nameTitleOrgChart" => "urn:microsoft.com/office/officeart/2008/layout/NameandTitleOrganizationalChart",
+        "verticalBoxList" => "urn:microsoft.com/office/officeart/2005/8/layout/list1",
+        "trapezoidList" => "urn:microsoft.com/office/officeart/2005/8/layout/hList6",
+        "tableList" => "urn:microsoft.com/office/officeart/2005/8/layout/hList3",
+        "accentProcess" => "urn:microsoft.com/office/officeart/2005/8/layout/process3",
+        "continuousBlockProcess" => "urn:microsoft.com/office/officeart/2005/8/layout/hProcess9",
+        "bendingProcess" => "urn:microsoft.com/office/officeart/2005/8/layout/process5",
+        "linearVenn" => "urn:microsoft.com/office/officeart/2005/8/layout/venn3",
+        "stackedVenn" => "urn:microsoft.com/office/officeart/2005/8/layout/venn2",
+        "nestedTarget" => "urn:microsoft.com/office/officeart/2005/8/layout/target2",
         "cycleMatrix" => "urn:microsoft.com/office/officeart/2005/8/layout/cycle4",
         "segmentedPyramid" => "urn:microsoft.com/office/officeart/2005/8/layout/pyramid4",
         "pie" => "urn:microsoft.com/office/officeart/2005/8/layout/chart3",
@@ -174,6 +184,16 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         "multidirectionalCycle",
         "orgChart",
         "halfCircleOrgChart",
+        "nameTitleOrgChart",
+        "verticalBoxList",
+        "trapezoidList",
+        "tableList",
+        "accentProcess",
+        "continuousBlockProcess",
+        "bendingProcess",
+        "linearVenn",
+        "stackedVenn",
+        "nestedTarget",
         "cycleMatrix",
         "segmentedPyramid",
         "pie",
@@ -194,6 +214,8 @@ pub fn kind_for(layout_id: &str, category: &str) -> &'static str {
         "target"
     } else if s.contains("timeline") {
         "timeline"
+    } else if s.contains("nameandtitle") {
+        "nameTitleOrgChart"
     } else if s.contains("orgchart") || s.contains("organizationchart") || s.contains("organizationalchart") {
         "orgChart"
     } else if s.contains("hierarchy") {
@@ -225,12 +247,22 @@ fn layout_id_of(kind: &str) -> &'static str {
 
 fn category(kind: &str) -> &'static str {
     match kind {
-        "process" | "chevron" | "verticalProcess" | "stepUp" | "pictureProcess" | "timeline" | "gear" | "funnel" => "process",
-        "venn" | "target" => "relationship",
+        "process"
+        | "chevron"
+        | "verticalProcess"
+        | "stepUp"
+        | "pictureProcess"
+        | "timeline"
+        | "gear"
+        | "funnel"
+        | "accentProcess"
+        | "continuousBlockProcess"
+        | "bendingProcess" => "process",
+        "venn" | "target" | "linearVenn" | "stackedVenn" | "nestedTarget" => "relationship",
         "cycle" | "blockCycle" | "radial" | "textCycle" | "continuousCycle" | "segmentedCycle" | "multidirectionalCycle" | "cycleMatrix" | "pie" => {
             "cycle"
         }
-        "hierarchy" | "horizontalHierarchy" | "orgChart" | "halfCircleOrgChart" => "hierarchy",
+        "hierarchy" | "horizontalHierarchy" | "orgChart" | "halfCircleOrgChart" | "nameTitleOrgChart" => "hierarchy",
         "pyramid" | "invertedPyramid" | "segmentedPyramid" => "pyramid",
         "matrix" | "titledMatrix" | "gridMatrix" => "matrix",
         _ => "list",
@@ -305,6 +337,17 @@ pub fn data_xml(d: &Diagram, seed: u32, drawing_rel: &str, pics: &[(usize, Strin
     }
     // A node's picture sits on the presentation point of its picture placeholder, as PowerPoint
     // stores it (`presAssocID` names the node, the blip is a relationship of the data part).
+    // Name and Title: a node's title is the text of its title box's presentation point.
+    for (k, n) in d.nodes.iter().enumerate() {
+        if n.title.is_empty() {
+            continue;
+        }
+        w.open("dgm:pt", A::new().a("modelId", guid(seed, 0x30_0000 + k)).a("type", "pres"));
+        w.empty("dgm:prSet", A::new().a("presAssocID", node(k)).a("presName", "titleText1").a("presStyleLbl", "fgAcc1").a("custT", "1"));
+        w.empty0("dgm:spPr");
+        text(&mut w, &n.title);
+        w.close("dgm:pt");
+    }
     for (k, rid) in pics {
         if *k >= d.nodes.len() {
             continue;
@@ -390,6 +433,7 @@ fn outline_ids(data: &El) -> Vec<(String, DiagramNode)> {
     let Some(pts) = data.child("ptLst") else { return vec![] };
     let mut texts: HashMap<&str, String> = HashMap::new();
     let mut assistants: std::collections::HashSet<&str> = std::collections::HashSet::new();
+    let mut titles: HashMap<&str, String> = HashMap::new();
     let mut doc: Option<&str> = None;
     for pt in pts.children_named("pt").take(MAX_NODES * 4) {
         let Some(id) = pt.attr("modelId") else { continue };
@@ -402,6 +446,16 @@ fn outline_ids(data: &El) -> Vec<(String, DiagramNode)> {
                     assistants.insert(id);
                 }
             }
+            "pres" => {
+                // Name and Title: the title box's own text, on its presentation point.
+                let pr = pt.child("prSet");
+                if pr.and_then(|p| p.attr("presName")).is_some_and(|n| n.starts_with("titleText"))
+                    && let Some(node) = pr.and_then(|p| p.attr("presAssocID"))
+                    && let Some(t) = pt.child("t").map(paragraphs).filter(|t| !t.is_empty())
+                {
+                    titles.insert(node, t);
+                }
+            }
             _ => {}
         }
     }
@@ -431,7 +485,13 @@ fn outline_ids(data: &El) -> Vec<(String, DiagramNode)> {
         }
         out.push((
             id.to_string(),
-            DiagramNode { text: texts.get(id).cloned().unwrap_or_default(), level: level.min(8), picture: None, assistant: assistants.contains(id) },
+            DiagramNode {
+                text: texts.get(id).cloned().unwrap_or_default(),
+                level: level.min(8),
+                picture: None,
+                assistant: assistants.contains(id),
+                title: titles.get(id).cloned().unwrap_or_default(),
+            },
         ));
         if let Some(v) = kids.get(id) {
             stack.extend(v.iter().rev().map(|(_, c)| (*c, level.saturating_add(1))));
@@ -539,7 +599,7 @@ pub fn layout_xml(kind: &str) -> Vec<u8> {
     w.empty0("dgm:dir");
     w.empty("dgm:resizeHandles", A::new().a("val", "exact"));
     w.close("dgm:varLst");
-    if matches!(kind, "hierarchy" | "horizontalHierarchy" | "orgChart" | "halfCircleOrgChart") {
+    if matches!(kind, "hierarchy" | "horizontalHierarchy" | "orgChart" | "halfCircleOrgChart" | "nameTitleOrgChart") {
         // Each node over the row of its children, recursively.
         w.empty("dgm:alg", A::new().a("type", "hierChild"));
         w.open("dgm:shape", A::new().a("r:blip", ""));
@@ -708,7 +768,7 @@ mod tests {
     use super::*;
 
     fn nodes(v: &[(&str, u8)]) -> Vec<DiagramNode> {
-        v.iter().map(|(t, l)| DiagramNode { text: (*t).into(), level: *l, picture: None, assistant: false }).collect()
+        v.iter().map(|(t, l)| DiagramNode { text: (*t).into(), level: *l, picture: None, assistant: false, title: String::new() }).collect()
     }
 
     #[test]
@@ -739,6 +799,7 @@ mod tests {
     fn assistants_survive_the_data_model() {
         let mut v = nodes(&[("CEO", 0), ("Aide", 1), ("CTO", 1)]);
         v[1].assistant = true;
+        v[0].title = "Chief Executive".into();
         let d = Diagram { kind: "orgChart".into(), nodes: v, ..Default::default() };
         let xml = data_xml(&d, 5, "rId1", &[]);
         assert!(String::from_utf8(xml.clone()).unwrap().contains("type=\"asst\""));
@@ -789,6 +850,16 @@ mod tests {
             "cycleMatrix",
             "segmentedPyramid",
             "pie",
+            "nameTitleOrgChart",
+            "verticalBoxList",
+            "trapezoidList",
+            "tableList",
+            "accentProcess",
+            "continuousBlockProcess",
+            "bendingProcess",
+            "linearVenn",
+            "stackedVenn",
+            "nestedTarget",
         ] {
             assert_eq!(kind_for(layout_id(k), ""), k);
         }
@@ -800,7 +871,7 @@ mod tests {
         let doc = crate::xml::parse(xml).unwrap();
         assert_eq!(outline(&doc.root), nodes(&[("A", 0), ("", 1)]));
         assert_eq!(kind_for("urn:microsoft.com/office/officeart/2005/8/layout/orgChart1", ""), "orgChart");
-        assert_eq!(kind_for("urn:x/layout/NameandTitleOrganizationalChart", ""), "orgChart");
+        assert_eq!(kind_for("urn:x/layout/NameandTitleOrganizationalChart", ""), "nameTitleOrgChart");
         assert_eq!(kind_for("urn:x/layout/chevron2", "process"), "chevron");
         assert_eq!(kind_for("urn:x/layout/hProcess9", "process"), "process");
         assert_eq!(kind_for("urn:x/layout/default", "list"), "blockList");
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index f996a8dd..2d47d62b 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2375,6 +2375,15 @@ fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
                 }
             }
         });
+        let (r, _) = small_button_ex(ui, Icon::Layout, "Convert", gid.is_some(), false, true);
+        egui::Popup::menu(&r).show(|ui| {
+            if ui.button("Convert to Text").clicked() {
+                run(app, "smartArt.toText", json!({"id": gid}));
+            }
+            if ui.button("Convert to Shapes").clicked() {
+                run(app, "smartArt.toShapes", json!({"id": gid}));
+            }
+        });
     });
     group(ui, |ui| {
         let (r, _) = small_button_ex(ui, Icon::ChangeChartType, "Change Colors", gid.is_some(), false, true);

From 304bf062905f34f933fe50d701b7ea446b1390fc Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:31:54 +0300
Subject: [PATCH 235/376] Insert: Lucide icon gallery as stroked shapes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Insert › Icons places seventy Lucide 1.56.0 stroke icons as custom
geometry: no fill, round caps, and a line width scaled from the
24-unit design. The gallery searches by name. SVG paths, including
arcs, are converted when the icon is inserted so the renderer strokes
the outline.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ATTRIBUTION.md                  |   3 +
 NOTICE                          |  45 +++++++
 ROADMAP.md                      |   4 +-
 crates/engine/src/cmd/insert.rs |  52 +++++++-
 crates/engine/src/icon_data.rs  |  75 +++++++++++
 crates/engine/src/icons.rs      | 230 ++++++++++++++++++++++++++++++++
 crates/engine/src/lib.rs        |   1 +
 crates/ui-egui/src/ribbon.rs    | 127 ++++++++++++------
 docs/gaps.md                    |   5 +-
 docs/target-app-parity.md       |   5 +-
 docs/ui-parity.md               |   8 +-
 11 files changed, 505 insertions(+), 50 deletions(-)
 create mode 100644 crates/engine/src/icon_data.rs
 create mode 100644 crates/engine/src/icons.rs

diff --git a/ATTRIBUTION.md b/ATTRIBUTION.md
index 9ca8e5e8..bb272430 100644
--- a/ATTRIBUTION.md
+++ b/ATTRIBUTION.md
@@ -7,6 +7,8 @@ fails if a file under `assets/`, `docs/images/` or `docs/brand/` is missing from
 DeckCraft contains **no Microsoft, Adobe, Avid or Autodesk iconography, images, fonts, themes,
 templates or other assets**. Its themes, colour schemes, layouts, preset-shape geometry, sample
 deck and UI icons are original work of the DeckCraft contributors (drawn or generated in code).
+Icons placed from Insert › Icons are Lucide paths (ISC; Feather-derived icons MIT), not Microsoft
+artwork. The ribbon and menu icons stay original drawings.
 
 ## In this repository
 
@@ -31,6 +33,7 @@ deck and UI icons are original work of the DeckCraft contributors (drawn or gene
 | `crates/fonts/tests/fixtures/legacy-semibold.ttf` | DeckCraft contributors | a one-glyph Semibold face named like Segoe UI Semibold (its Windows family differs from the typographic one), built by `make_legacy_font.py` (fontTools as the builder only) | CC0-1.0 | Font lookup by Windows family name tests |
 | `crates/fonts/tests/fixtures/legacy-regular.ttf` | DeckCraft contributors | the same family's one-glyph Regular face, built by `make_legacy_font.py` (fontTools as the builder only) | CC0-1.0 | Font lookup by Windows family name tests |
 | `crates/render/tests/fixtures/make_colr_font.py` | DeckCraft contributors | this repository | MIT OR Apache-2.0 | Regenerates the COLR test font |
+| Lucide icon paths in `crates/engine/src/icon_data.rs` (Insert › Icons) | Lucide Contributors; Feather icons by Cole Bemis | https://github.com/lucide-icons/lucide/tree/440a1e1dfb1e712505308da46bead3c28b1f1398/icons (release 1.56.0, 2026-10-13) | ISC; MIT for the Feather-derived icons named in that commit's LICENSE | Stroke icons inserted as shapes |
 
 ## Bundled through dependencies
 
diff --git a/NOTICE b/NOTICE
index fb209cfc..4fc19273 100644
--- a/NOTICE
+++ b/NOTICE
@@ -19,6 +19,51 @@ list (author, source, license) is in ATTRIBUTION.md.
   ATTRIBUTION.md (Inter, Carlito, Caladea, Liberation, Montserrat, Lato, Open Sans, Roboto,
   Merriweather, Playfair Display, Poppins, Nunito Sans, BIZ UD, Shippori Mincho, Noto Sans
   Arabic) under the SIL Open Font License 1.1; their licence texts ship with release packages.
+- Lucide icon paths embedded in crates/engine/src/icon_data.rs (Insert › Icons), release 1.56.0,
+  commit 440a1e1dfb1e712505308da46bead3c28b1f1398, https://github.com/lucide-icons/lucide.
+  ISC License, Copyright (c) 2026 Lucide Icons and Contributors. Icons Lucide derives from Feather
+  are MIT, Copyright (c) 2013-present Cole Bemis; which names those are is the list in Lucide's
+  LICENSE at that commit. Among the paths embedded here, the Feather-derived names are arrow-down,
+  arrow-left, arrow-right, arrow-up, at-sign, calendar, check, chevron-right, clipboard, clock,
+  compass, download, info, key, link, lock, minus, moon, move, music, plus, search, target and x.
+
+  ISC License
+
+  Copyright (c) 2026 Lucide Icons and Contributors
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+  The MIT License (MIT) (for the Feather-derived icons)
+
+  Copyright (c) 2013-present Cole Bemis
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
 
 Code dependencies
 
diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..bf1bf632 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Lucide icon gallery; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Insert › Icons: a gallery of Lucide stroke icons (release 1.56.0) inserted as custom shapes, no fill, round stroke scaled from the 24-unit design |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Lucide icon gallery |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..aed42cf8 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -5,7 +5,7 @@ use deckcraft_geom::Xfrm;
 use deckcraft_model::chart::ChartType;
 use deckcraft_model::style::PictureFill;
 use deckcraft_model::text::{AutoFit, RunKind, TextBody};
-use deckcraft_model::{Chart, ColorRef, Fill, Geom, MediaClip, Shape, ShapeId, ShapeKind, ShapeStyle, Table};
+use deckcraft_model::{Chart, ColorRef, Fill, Geom, Line, MediaClip, Shape, ShapeId, ShapeKind, ShapeStyle, Table};
 use serde_json::{Value, json};
 
 use super::*;
@@ -22,6 +22,16 @@ pub fn specs() -> Vec<CommandSpec> {
             has_slide,
             insert_shape
         ),
+        cmd!(
+            "insert.icon",
+            "Icons",
+            ["Insert", "Illustrations"],
+            None,
+            "{name: star|arrow-right|… (see insert.icons), rect?: [x,y,w,h]}",
+            has_slide,
+            insert_icon
+        ),
+        cmd!(query "insert.icons", "Icon Gallery", [], None, "{} → [{name, label, category}]", always, list_icons),
         cmd!(query "shape.presets", "Shape Gallery", [], None, "{} → [{name, label, category}]", always, presets),
         cmd!("insert.textBox", "Text Box", ["Insert", "Text"], None, "{rect?: [x,y,w,h], text?: string}", has_slide, text_box),
         cmd!(
@@ -186,6 +196,46 @@ fn presets(_s: &mut Session, _p: &Value) -> Result<Value> {
     ))
 }
 
+fn list_icons(_s: &mut Session, _p: &Value) -> Result<Value> {
+    Ok(Value::Array(crate::icons::icons().iter().map(|i| json!({"name": i.name, "label": i.label, "category": i.category})).collect()))
+}
+
+/// A Lucide stroke icon: custom geometry, no fill, round line scaled from the 24-unit design.
+fn insert_icon(s: &mut Session, p: &Value) -> Result<Value> {
+    let name = str_param(p, "name").ok_or_else(|| bad("insert.icon", "missing `name`"))?;
+    let icon = crate::icons::find(name).ok_or_else(|| bad("insert.icon", format!("unknown icon `{name}`")))?;
+    let d = crate::icons::path_data(icon.name).ok_or_else(|| bad("insert.icon", format!("could not build icon `{}`", icon.name)))?;
+    let rect = rect_param(p, "rect").unwrap_or_else(|| default_rect(s, 72.0, 72.0));
+    if rect.w < 1.0 || rect.h < 1.0 {
+        return Err(bad("insert.icon", "rect needs a positive width and height"));
+    }
+    let shape = Shape {
+        name: icon.label.to_string(),
+        xfrm: Some(rect),
+        geom: Geom::Custom {
+            paths: vec![deckcraft_model::CustomPath {
+                w: crate::icons::VIEW,
+                h: crate::icons::VIEW,
+                d,
+                fill: deckcraft_geom::preset::FillMode::None,
+                stroke: true,
+            }],
+        },
+        fill: Some(Fill::None),
+        line: Some(Line {
+            fill: Some(Fill::solid(ColorRef::scheme(SchemeSlot::Tx1))),
+            width: Some(crate::icons::stroke_width(icon, rect.w, rect.h)),
+            cap: Some(deckcraft_model::style::LineCap::Round),
+            join: Some(deckcraft_model::style::LineJoin::Round),
+            ..Default::default()
+        }),
+        style: Some(ShapeStyle::line(SchemeSlot::Tx1)),
+        ..Default::default()
+    };
+    let id = add_shape(s, shape, true)?;
+    Ok(json!({"id": id}))
+}
+
 pub(crate) fn new_text_box(rect: Xfrm, text: &str) -> Shape {
     let mut body = TextBody::from_text(text);
     body.body.wrap = Some(true);
diff --git a/crates/engine/src/icon_data.rs b/crates/engine/src/icon_data.rs
new file mode 100644
index 00000000..dc0f06d7
--- /dev/null
+++ b/crates/engine/src/icon_data.rs
@@ -0,0 +1,75 @@
+// Lucide 1.56.0 (commit 440a1e1dfb1e712505308da46bead3c28b1f1398).
+// Stroke centerlines on a 24×24 viewBox. Independent SVG subpaths are separated by ` | `.
+// ISC; Feather-derived icons MIT. See NOTICE and ATTRIBUTION.md.
+static ICONS: &[Icon] = &[
+    Icon { name: "arrow-up", label: "Arrow up", category: "Arrows", stroke: 2.0, d: "m5 12 7-7 7 7 | M12 19V5" },
+    Icon { name: "arrow-down", label: "Arrow down", category: "Arrows", stroke: 2.0, d: "M12 5v14 | m19 12-7 7-7-7" },
+    Icon { name: "arrow-left", label: "Arrow left", category: "Arrows", stroke: 2.0, d: "m12 19-7-7 7-7 | M19 12H5" },
+    Icon { name: "arrow-right", label: "Arrow right", category: "Arrows", stroke: 2.0, d: "M5 12h14 | m12 5 7 7-7 7" },
+    Icon { name: "chevron-right", label: "Chevron", category: "Arrows", stroke: 2.0, d: "m9 18 6-6-6-6" },
+    Icon { name: "undo-2", label: "Undo", category: "Arrows", stroke: 2.0, d: "M9 14 4 9l5-5 | M4 9h10.5a5.5 5.5 0 0 1 5.5 5.5a5.5 5.5 0 0 1-5.5 5.5H11" },
+    Icon { name: "refresh-cw", label: "Refresh", category: "Arrows", stroke: 2.0, d: "M3 12a9 9 0 0 1 9-9 9.75 9.75 0 0 1 6.74 2.74L21 8 | M21 3v5h-5 | M21 12a9 9 0 0 1-9 9 9.75 9.75 0 0 1-6.74-2.74L3 16 | M8 16H3v5" },
+    Icon { name: "move", label: "Move", category: "Arrows", stroke: 2.0, d: "M12 2v20 | m15 19-3 3-3-3 | m19 9 3 3-3 3 | M2 12h20 | m5 9-3 3 3 3 | m9 5 3-3 3 3" },
+    Icon { name: "check", label: "Check", category: "Marks", stroke: 2.0, d: "M20 6 9 17l-5-5" },
+    Icon { name: "x", label: "X", category: "Marks", stroke: 2.0, d: "M18 6 6 18 | m6 6 12 12" },
+    Icon { name: "plus", label: "Plus", category: "Marks", stroke: 2.0, d: "M5 12h14 | M12 5v14" },
+    Icon { name: "minus", label: "Minus", category: "Marks", stroke: 2.0, d: "M5 12h14" },
+    Icon { name: "star", label: "Star", category: "Marks", stroke: 2.0, d: "M11.525 2.295a.53.53 0 0 1 .95 0l2.31 4.679a2.123 2.123 0 0 0 1.595 1.16l5.166.756a.53.53 0 0 1 .294.904l-3.736 3.638a2.123 2.123 0 0 0-.611 1.878l.882 5.14a.53.53 0 0 1-.771.56l-4.618-2.428a2.122 2.122 0 0 0-1.973 0L6.396 21.01a.53.53 0 0 1-.77-.56l.881-5.139a2.122 2.122 0 0 0-.611-1.879L2.16 9.795a.53.53 0 0 1 .294-.906l5.165-.755a2.122 2.122 0 0 0 1.597-1.16z" },
+    Icon { name: "heart", label: "Heart", category: "Marks", stroke: 2.0, d: "M2 9.5a5.5 5.5 0 0 1 9.591-3.676.56.56 0 0 0 .818 0A5.49 5.49 0 0 1 22 9.5c0 2.29-1.5 4-3 5.5l-5.492 5.313a2 2 0 0 1-3 .019L5 15c-1.5-1.5-3-3.2-3-5.5" },
+    Icon { name: "flag", label: "Flag", category: "Marks", stroke: 2.0, d: "M4 22V4a1 1 0 0 1 .4-.8A6 6 0 0 1 8 2c3 0 5 2 7.333 2q2 0 3.067-.8A1 1 0 0 1 20 4v10a1 1 0 0 1-.4.8A6 6 0 0 1 16 16c-3 0-5-2-8-2a6 6 0 0 0-4 1.528" },
+    Icon { name: "bookmark", label: "Bookmark", category: "Marks", stroke: 2.0, d: "M17 3a2 2 0 0 1 2 2v15a1 1 0 0 1-1.496.868l-4.512-2.578a2 2 0 0 0-1.984 0l-4.512 2.578A1 1 0 0 1 5 20V5a2 2 0 0 1 2-2z" },
+    Icon { name: "award", label: "Award", category: "Marks", stroke: 2.0, d: "m15.477 12.89 1.515 8.526a.5.5 0 0 1-.81.47l-3.58-2.687a1 1 0 0 0-1.197 0l-3.586 2.686a.5.5 0 0 1-.81-.469l1.514-8.526 | M 6 8 A 6 6 0 0 1 12 2 A 6 6 0 0 1 18 8 A 6 6 0 0 1 12 14 A 6 6 0 0 1 6 8 Z" },
+    Icon { name: "thumbs-up", label: "Thumbs up", category: "Marks", stroke: 2.0, d: "M15 5.88 14 10h5.83a2 2 0 0 1 1.92 2.56l-2.33 8A2 2 0 0 1 17.5 22H4a2 2 0 0 1-2-2v-8a2 2 0 0 1 2-2h2.76a2 2 0 0 0 1.79-1.11L12 2a3.13 3.13 0 0 1 3 3.88Z | M7 10v12" },
+    Icon { name: "circle-check", label: "Check circle", category: "Marks", stroke: 2.0, d: "M 2 12 A 10 10 0 0 1 12 2 A 10 10 0 0 1 22 12 A 10 10 0 0 1 12 22 A 10 10 0 0 1 2 12 Z | m16 9-5.5 5.5L8 12" },
+    Icon { name: "triangle-alert", label: "Warning", category: "Marks", stroke: 2.0, d: "m21.73 18-8-14a2 2 0 0 0-3.48 0l-8 14A2 2 0 0 0 4 21h16a2 2 0 0 0 1.73-3 | M12 9v4 | M12 17h.01" },
+    Icon { name: "user", label: "User", category: "People", stroke: 2.0, d: "M19 21v-2a4 4 0 0 0-4-4H9a4 4 0 0 0-4 4v2 | M 8 7 A 4 4 0 0 1 12 3 A 4 4 0 0 1 16 7 A 4 4 0 0 1 12 11 A 4 4 0 0 1 8 7 Z" },
+    Icon { name: "users", label: "Users", category: "People", stroke: 2.0, d: "M16 21v-2a4 4 0 0 0-4-4H6a4 4 0 0 0-4 4v2 | M16 3.128a4 4 0 0 1 0 7.744 | M22 21v-2a4 4 0 0 0-3-3.87 | M 5 7 A 4 4 0 0 1 9 3 A 4 4 0 0 1 13 7 A 4 4 0 0 1 9 11 A 4 4 0 0 1 5 7 Z" },
+    Icon { name: "circle-user", label: "Account", category: "People", stroke: 2.0, d: "M 2 12 A 10 10 0 0 1 12 2 A 10 10 0 0 1 22 12 A 10 10 0 0 1 12 22 A 10 10 0 0 1 2 12 Z | M 9 10 A 3 3 0 0 1 12 7 A 3 3 0 0 1 15 10 A 3 3 0 0 1 12 13 A 3 3 0 0 1 9 10 Z | M7 20.662V19a2 2 0 0 1 2-2h6a2 2 0 0 1 2 2v1.662" },
+    Icon { name: "hand", label: "Hand", category: "People", stroke: 2.0, d: "M18 11V6a2 2 0 0 0-2-2a2 2 0 0 0-2 2 | M14 10V4a2 2 0 0 0-2-2a2 2 0 0 0-2 2v2 | M10 10.5V6a2 2 0 0 0-2-2a2 2 0 0 0-2 2v8 | M18 8a2 2 0 1 1 4 0v6a8 8 0 0 1-8 8h-2c-2.8 0-4.5-.86-5.99-2.34l-3.6-3.6a2 2 0 0 1 2.83-2.82L7 15" },
+    Icon { name: "calendar", label: "Calendar", category: "Time", stroke: 2.0, d: "M8 2v3 | M16 2v3 | M 5 3 H 19 A 2 2 0 0 1 21 5 V 19 A 2 2 0 0 1 19 21 H 5 A 2 2 0 0 1 3 19 V 5 A 2 2 0 0 1 5 3 Z | M3 9h18" },
+    Icon { name: "clock", label: "Clock", category: "Time", stroke: 2.0, d: "M 2 12 A 10 10 0 0 1 12 2 A 10 10 0 0 1 22 12 A 10 10 0 0 1 12 22 A 10 10 0 0 1 2 12 Z | M12 6v6l4 2" },
+    Icon { name: "hourglass", label: "Hourglass", category: "Time", stroke: 2.0, d: "M5 22h14 | M5 2h14 | M17 22v-4.172a2 2 0 0 0-.586-1.414L12 12l-4.414 4.414A2 2 0 0 0 7 17.828V22 | M7 2v4.172a2 2 0 0 0 .586 1.414L12 12l4.414-4.414A2 2 0 0 0 17 6.172V2" },
+    Icon { name: "timer", label: "Timer", category: "Time", stroke: 2.0, d: "M 10 2 L 14 2 | M 12 14 L 15 11 | M 4 14 A 8 8 0 0 1 12 6 A 8 8 0 0 1 20 14 A 8 8 0 0 1 12 22 A 8 8 0 0 1 4 14 Z" },
+    Icon { name: "mail", label: "Mail", category: "Communication", stroke: 2.0, d: "m22 7-8.991 5.727a2 2 0 0 1-2.009 0L2 7 | M 4 4 H 20 A 2 2 0 0 1 22 6 V 18 A 2 2 0 0 1 20 20 H 4 A 2 2 0 0 1 2 18 V 6 A 2 2 0 0 1 4 4 Z" },
+    Icon { name: "phone", label: "Phone", category: "Communication", stroke: 2.0, d: "M13.832 16.568a1 1 0 0 0 1.213-.303l.355-.465A2 2 0 0 1 17 15h3a2 2 0 0 1 2 2v3a2 2 0 0 1-2 2A18 18 0 0 1 2 4a2 2 0 0 1 2-2h3a2 2 0 0 1 2 2v3a2 2 0 0 1-.8 1.6l-.468.351a1 1 0 0 0-.292 1.233 14 14 0 0 0 6.392 6.384" },
+    Icon { name: "message-circle", label: "Message", category: "Communication", stroke: 2.0, d: "M2.992 16.342a2 2 0 0 1 .094 1.167l-1.065 3.29a1 1 0 0 0 1.236 1.168l3.413-.998a2 2 0 0 1 1.099.092 10 10 0 1 0-4.777-4.719" },
+    Icon { name: "bell", label: "Bell", category: "Communication", stroke: 2.0, d: "M10.268 21a2 2 0 0 0 3.464 0 | M3.262 15.326A1 1 0 0 0 4 17h16a1 1 0 0 0 .74-1.673C19.41 13.956 18 12.499 18 8A6 6 0 0 0 6 8c0 4.499-1.411 5.956-2.738 7.326" },
+    Icon { name: "megaphone", label: "Megaphone", category: "Communication", stroke: 2.0, d: "M11 6a13 13 0 0 0 8.4-2.8A1 1 0 0 1 21 4v12a1 1 0 0 1-1.6.8A13 13 0 0 0 11 14H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2z | M6 14a12 12 0 0 0 2.4 7.2 2 2 0 0 0 3.2-2.4A8 8 0 0 1 10 14 | M8 6v8" },
+    Icon { name: "at-sign", label: "Mention", category: "Communication", stroke: 2.0, d: "M 8 12 A 4 4 0 0 1 12 8 A 4 4 0 0 1 16 12 A 4 4 0 0 1 12 16 A 4 4 0 0 1 8 12 Z | M16 8v5a3 3 0 0 0 6 0v-1a10 10 0 1 0-4 8" },
+    Icon { name: "chart-column", label: "Column chart", category: "Charts", stroke: 2.0, d: "M3 3v16a2 2 0 0 0 2 2h16 | M18 17V9 | M13 17V5 | M8 17v-3" },
+    Icon { name: "chart-bar", label: "Bar chart", category: "Charts", stroke: 2.0, d: "M3 3v16a2 2 0 0 0 2 2h16 | M7 16h8 | M7 11h12 | M7 6h3" },
+    Icon { name: "chart-pie", label: "Pie chart", category: "Charts", stroke: 2.0, d: "M21 12c.552 0 1.005-.449.95-.998a10 10 0 0 0-8.953-8.951c-.55-.055-.998.398-.998.95v8a1 1 0 0 0 1 1z | M21.21 15.89A10 10 0 1 1 8 2.83" },
+    Icon { name: "trending-up", label: "Trend", category: "Charts", stroke: 2.0, d: "M16 7h6v6 | m22 7-8.5 8.5-5-5L2 17" },
+    Icon { name: "target", label: "Target", category: "Charts", stroke: 2.0, d: "M 2 12 A 10 10 0 0 1 12 2 A 10 10 0 0 1 22 12 A 10 10 0 0 1 12 22 A 10 10 0 0 1 2 12 Z | M 6 12 A 6 6 0 0 1 12 6 A 6 6 0 0 1 18 12 A 6 6 0 0 1 12 18 A 6 6 0 0 1 6 12 Z | M 10 12 A 2 2 0 0 1 12 10 A 2 2 0 0 1 14 12 A 2 2 0 0 1 12 14 A 2 2 0 0 1 10 12 Z" },
+    Icon { name: "lightbulb", label: "Idea", category: "Charts", stroke: 2.0, d: "M15 14c.2-1 .7-1.7 1.5-2.5 1-.9 1.5-2.2 1.5-3.5A6 6 0 0 0 6 8c0 1 .2 2.2 1.5 3.5.7.7 1.3 1.5 1.5 2.5 | M9 18h6 | M10 22h4" },
+    Icon { name: "presentation", label: "Presentation", category: "Charts", stroke: 2.0, d: "M2 3h20 | M21 3v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V3 | m7 21 5-5 5 5" },
+    Icon { name: "file", label: "File", category: "Files", stroke: 2.0, d: "M6 22a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h8a2.4 2.4 0 0 1 1.704.706l3.588 3.588A2.4 2.4 0 0 1 20 8v12a2 2 0 0 1-2 2z | M14 2v5a1 1 0 0 0 1 1h5" },
+    Icon { name: "folder", label: "Folder", category: "Files", stroke: 2.0, d: "M20 20a2 2 0 0 0 2-2V8a2 2 0 0 0-2-2h-7.9a2 2 0 0 1-1.69-.9L9.6 3.9A2 2 0 0 0 7.93 3H4a2 2 0 0 0-2 2v13a2 2 0 0 0 2 2Z" },
+    Icon { name: "file-text", label: "Document", category: "Files", stroke: 2.0, d: "M6 22a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h8a2.4 2.4 0 0 1 1.704.706l3.588 3.588A2.4 2.4 0 0 1 20 8v12a2 2 0 0 1-2 2z | M14 2v5a1 1 0 0 0 1 1h5 | M10 9H8 | M16 13H8 | M16 17H8" },
+    Icon { name: "paperclip", label: "Attachment", category: "Files", stroke: 2.0, d: "m16 6-8.414 8.586a2 2 0 0 0 2.829 2.829l8.414-8.586a4 4 0 1 0-5.657-5.657l-8.379 8.551a6 6 0 1 0 8.485 8.485l8.379-8.551" },
+    Icon { name: "clipboard", label: "Clipboard", category: "Files", stroke: 2.0, d: "M 9 2 H 15 A 1 1 0 0 1 16 3 V 5 A 1 1 0 0 1 15 6 H 9 A 1 1 0 0 1 8 5 V 3 A 1 1 0 0 1 9 2 Z | M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2" },
+    Icon { name: "link", label: "Link", category: "Files", stroke: 2.0, d: "M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71 | M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71" },
+    Icon { name: "download", label: "Download", category: "Files", stroke: 2.0, d: "M12 15V3 | M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4 | m7 10 5 5 5-5" },
+    Icon { name: "share-2", label: "Share", category: "Files", stroke: 2.0, d: "M 15 5 A 3 3 0 0 1 18 2 A 3 3 0 0 1 21 5 A 3 3 0 0 1 18 8 A 3 3 0 0 1 15 5 Z | M 3 12 A 3 3 0 0 1 6 9 A 3 3 0 0 1 9 12 A 3 3 0 0 1 6 15 A 3 3 0 0 1 3 12 Z | M 15 19 A 3 3 0 0 1 18 16 A 3 3 0 0 1 21 19 A 3 3 0 0 1 18 22 A 3 3 0 0 1 15 19 Z | M 8.59 13.51 L 15.42 17.49 | M 15.41 6.51 L 8.59 10.49" },
+    Icon { name: "house", label: "Home", category: "Places", stroke: 2.0, d: "M15 21v-8a1 1 0 0 0-1-1h-4a1 1 0 0 0-1 1v8 | M3 10a2 2 0 0 1 .709-1.528l7-6a2 2 0 0 1 2.582 0l7 6A2 2 0 0 1 21 10v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z" },
+    Icon { name: "map-pin", label: "Pin", category: "Places", stroke: 2.0, d: "M20 10c0 4.993-5.539 10.193-7.399 11.799a1 1 0 0 1-1.202 0C9.539 20.193 4 14.993 4 10a8 8 0 0 1 16 0 | M 9 10 A 3 3 0 0 1 12 7 A 3 3 0 0 1 15 10 A 3 3 0 0 1 12 13 A 3 3 0 0 1 9 10 Z" },
+    Icon { name: "globe", label: "Globe", category: "Places", stroke: 2.0, d: "M 2 12 A 10 10 0 0 1 12 2 A 10 10 0 0 1 22 12 A 10 10 0 0 1 12 22 A 10 10 0 0 1 2 12 Z | M12 2a14.5 14.5 0 0 0 0 20 14.5 14.5 0 0 0 0-20 | M2 12h20" },
+    Icon { name: "building", label: "Building", category: "Places", stroke: 2.0, d: "M12 10h.01 | M12 14h.01 | M12 6h.01 | M16 10h.01 | M16 14h.01 | M16 6h.01 | M8 10h.01 | M8 14h.01 | M8 6h.01 | M9 22v-3a1 1 0 0 1 1-1h4a1 1 0 0 1 1 1v3 | M 6 2 H 18 A 2 2 0 0 1 20 4 V 20 A 2 2 0 0 1 18 22 H 6 A 2 2 0 0 1 4 20 V 4 A 2 2 0 0 1 6 2 Z" },
+    Icon { name: "compass", label: "Compass", category: "Places", stroke: 2.0, d: "M 2 12 A 10 10 0 0 1 12 2 A 10 10 0 0 1 22 12 A 10 10 0 0 1 12 22 A 10 10 0 0 1 2 12 Z | m16.24 7.76-1.804 5.411a2 2 0 0 1-1.265 1.265L7.76 16.24l1.804-5.411a2 2 0 0 1 1.265-1.265z" },
+    Icon { name: "briefcase", label: "Briefcase", category: "Places", stroke: 2.0, d: "M16 20V4a2 2 0 0 0-2-2h-4a2 2 0 0 0-2 2v16 | M 4 6 H 20 A 2 2 0 0 1 22 8 V 18 A 2 2 0 0 1 20 20 H 4 A 2 2 0 0 1 2 18 V 8 A 2 2 0 0 1 4 6 Z" },
+    Icon { name: "image", label: "Picture", category: "Media", stroke: 2.0, d: "M 5 3 H 19 A 2 2 0 0 1 21 5 V 19 A 2 2 0 0 1 19 21 H 5 A 2 2 0 0 1 3 19 V 5 A 2 2 0 0 1 5 3 Z | M 7 9 A 2 2 0 0 1 9 7 A 2 2 0 0 1 11 9 A 2 2 0 0 1 9 11 A 2 2 0 0 1 7 9 Z | m21 15-3.086-3.086a2 2 0 0 0-2.828 0L6 21" },
+    Icon { name: "camera", label: "Camera", category: "Media", stroke: 2.0, d: "M13.997 4a2 2 0 0 1 1.76 1.05l.486.9A2 2 0 0 0 18.003 7H20a2 2 0 0 1 2 2v9a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V9a2 2 0 0 1 2-2h1.997a2 2 0 0 0 1.759-1.048l.489-.904A2 2 0 0 1 10.004 4z | M 9 13 A 3 3 0 0 1 12 10 A 3 3 0 0 1 15 13 A 3 3 0 0 1 12 16 A 3 3 0 0 1 9 13 Z" },
+    Icon { name: "play", label: "Play", category: "Media", stroke: 2.0, d: "M5 5a2 2 0 0 1 3.008-1.728l11.997 6.998a2 2 0 0 1 .003 3.458l-12 7A2 2 0 0 1 5 19z" },
+    Icon { name: "clapperboard", label: "Clapperboard", category: "Media", stroke: 2.0, d: "m12.296 3.464 3.02 3.956 | M20.2 6 3 11l-.9-2.4c-.3-1.1.3-2.2 1.3-2.5l13.5-4c1.1-.3 2.2.3 2.5 1.3z | M3 11h18v8a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z | m6.18 5.276 3.1 3.899" },
+    Icon { name: "music", label: "Music", category: "Media", stroke: 2.0, d: "M9 18V5l12-2v13 | M 3 18 A 3 3 0 0 1 6 15 A 3 3 0 0 1 9 18 A 3 3 0 0 1 6 21 A 3 3 0 0 1 3 18 Z | M 15 16 A 3 3 0 0 1 18 13 A 3 3 0 0 1 21 16 A 3 3 0 0 1 18 19 A 3 3 0 0 1 15 16 Z" },
+    Icon { name: "settings", label: "Settings", category: "Objects", stroke: 2.0, d: "M9.671 4.136a2.34 2.34 0 0 1 4.659 0 2.34 2.34 0 0 0 3.319 1.915 2.34 2.34 0 0 1 2.33 4.033 2.34 2.34 0 0 0 0 3.831 2.34 2.34 0 0 1-2.33 4.033 2.34 2.34 0 0 0-3.319 1.915 2.34 2.34 0 0 1-4.659 0 2.34 2.34 0 0 0-3.32-1.915 2.34 2.34 0 0 1-2.33-4.033 2.34 2.34 0 0 0 0-3.831A2.34 2.34 0 0 1 6.35 6.051a2.34 2.34 0 0 0 3.319-1.915 | M 9 12 A 3 3 0 0 1 12 9 A 3 3 0 0 1 15 12 A 3 3 0 0 1 12 15 A 3 3 0 0 1 9 12 Z" },
+    Icon { name: "search", label: "Search", category: "Objects", stroke: 2.0, d: "m21 21-4.34-4.34 | M 3 11 A 8 8 0 0 1 11 3 A 8 8 0 0 1 19 11 A 8 8 0 0 1 11 19 A 8 8 0 0 1 3 11 Z" },
+    Icon { name: "info", label: "Info", category: "Objects", stroke: 2.0, d: "M 2 12 A 10 10 0 0 1 12 2 A 10 10 0 0 1 22 12 A 10 10 0 0 1 12 22 A 10 10 0 0 1 2 12 Z | M12 16v-4 | M12 8h.01" },
+    Icon { name: "circle-alert", label: "Alert", category: "Objects", stroke: 2.0, d: "M 2 12 A 10 10 0 0 1 12 2 A 10 10 0 0 1 22 12 A 10 10 0 0 1 12 22 A 10 10 0 0 1 2 12 Z | M 12 8 L 12 12 | M 12 16 L 12.01 16" },
+    Icon { name: "lock", label: "Lock", category: "Objects", stroke: 2.0, d: "M 5 11 H 19 A 2 2 0 0 1 21 13 V 20 A 2 2 0 0 1 19 22 H 5 A 2 2 0 0 1 3 20 V 13 A 2 2 0 0 1 5 11 Z | M7 11V7a5 5 0 0 1 10 0v4" },
+    Icon { name: "key", label: "Key", category: "Objects", stroke: 2.0, d: "m2 21 9.6-9.6 | m7.5 15.5 2.3 2.3a1 1 0 0 1 0 1.4l-2.1 2.1a1 1 0 0 1-1.4 0L4 19 | M 10 7.5 A 5.5 5.5 0 0 1 15.5 2 A 5.5 5.5 0 0 1 21 7.5 A 5.5 5.5 0 0 1 15.5 13 A 5.5 5.5 0 0 1 10 7.5 Z" },
+    Icon { name: "zap", label: "Bolt", category: "Objects", stroke: 2.0, d: "M15.914 4a1.5 1.5 0 00-2.474-1.561l-9 9A1.5 1.5 0 005.5 14h4.002a.5.5 0 01.471.666L8.086 20a1.5 1.5 0 002.475 1.56l9-9A1.5 1.5 0 0018.5 10h-3.997a.5.5 0 01-.472-.667z" },
+    Icon { name: "sun", label: "Sun", category: "Objects", stroke: 2.0, d: "M 8 12 A 4 4 0 0 1 12 8 A 4 4 0 0 1 16 12 A 4 4 0 0 1 12 16 A 4 4 0 0 1 8 12 Z | M12 2v2 | M12 20v2 | m4.93 4.93 1.41 1.41 | m17.66 17.66 1.41 1.41 | M2 12h2 | M20 12h2 | m6.34 17.66-1.41 1.41 | m19.07 4.93-1.41 1.41" },
+    Icon { name: "moon", label: "Moon", category: "Objects", stroke: 2.0, d: "M20.985 12.486a9 9 0 1 1-9.473-9.472c.405-.022.617.46.402.803a6 6 0 0 0 8.268 8.268c.344-.215.825-.004.803.401" },
+    Icon { name: "cloud", label: "Cloud", category: "Objects", stroke: 2.0, d: "M17.5 19H9a7 7 0 1 1 6.71-9h1.79a4.5 4.5 0 1 1 0 9Z" },
+];
diff --git a/crates/engine/src/icons.rs b/crates/engine/src/icons.rs
new file mode 100644
index 00000000..89c72180
--- /dev/null
+++ b/crates/engine/src/icons.rs
@@ -0,0 +1,230 @@
+//! Insert › Icons: Lucide stroke icons as custom geometry.
+//!
+//! The paths in `icon_data.rs` are Lucide 1.56.0 centerlines (24×24, fill none). They are converted
+//! to DeckCraft's `M`/`L`/`C`/`Q`/`Z` syntax when inserted, so the shape is a stroked outline rather
+//! than a filled silhouette or an SVG picture.
+
+use std::collections::HashMap;
+use std::sync::OnceLock;
+
+use deckcraft_geom::{BezPath, PathEl};
+
+/// Design size of every icon, in path units. Lucide's viewBox is `0 0 24 24`.
+pub const VIEW: f64 = 24.0;
+
+/// One icon from the Insert gallery.
+pub struct Icon {
+    pub name: &'static str,
+    pub label: &'static str,
+    pub category: &'static str,
+    /// Design stroke width in viewBox units (Lucide's default is 2).
+    pub stroke: f64,
+    /// SVG path data. Independent subpaths (separate SVG elements) are separated by ` | `.
+    pub d: &'static str,
+}
+
+include!("icon_data.rs");
+
+/// Every icon, in gallery order.
+pub fn icons() -> &'static [Icon] {
+    ICONS
+}
+
+/// `name` is the Lucide id (`arrow-right`, `arrow_right`) or the gallery label (`Arrow right`).
+pub fn find(name: &str) -> Option<&'static Icon> {
+    let raw = name.trim();
+    if raw.is_empty() {
+        return None;
+    }
+    let key = raw.to_ascii_lowercase().replace('_', "-");
+    ICONS.iter().find(|i| i.name == key || i.label.eq_ignore_ascii_case(raw))
+}
+
+/// The icon's outline in the 24×24 viewBox.
+pub fn outline(name: &str) -> Option<&'static BezPath> {
+    let icon = find(name)?;
+    parsed().get(icon.name)
+}
+
+/// DeckCraft path syntax for `name`, in the 24×24 viewBox.
+pub fn path_data(name: &str) -> Option<String> {
+    outline(name).and_then(deck_path)
+}
+
+/// Stroke width in points for a shape `w`×`h` points. Lucide's stroke is `stroke` units on a
+/// 24-unit box, so a 72 pt icon is a 6 pt line. Resizing the shape later does not change it.
+pub fn stroke_width(icon: &Icon, w: f64, h: f64) -> f64 {
+    let span = w.min(h).abs().min(4_000.0);
+    let design = if icon.stroke.is_finite() && icon.stroke > 0.0 { icon.stroke } else { 2.0 };
+    (span * design / VIEW).clamp(0.25, 400.0)
+}
+
+fn parsed() -> &'static HashMap<&'static str, BezPath> {
+    static CACHE: OnceLock<HashMap<&'static str, BezPath>> = OnceLock::new();
+    CACHE.get_or_init(|| {
+        let mut m = HashMap::new();
+        for icon in ICONS {
+            if let Some(bp) = bezpath(icon.d) {
+                m.insert(icon.name, bp);
+            }
+        }
+        m
+    })
+}
+
+/// Parse SVG path data, one independent subpath at a time (` | ` resets the current point).
+fn bezpath(d: &str) -> Option<BezPath> {
+    let mut out = BezPath::new();
+    for part in d.split(" | ") {
+        let part = part.trim();
+        if part.is_empty() {
+            continue;
+        }
+        let bp = BezPath::from_svg(part).ok()?;
+        for el in bp.elements() {
+            out.push(*el);
+        }
+    }
+    if out.elements().is_empty() { None } else { Some(out) }
+}
+
+fn deck_path(bp: &BezPath) -> Option<String> {
+    let mut out = String::new();
+    let mut started = false;
+    for el in bp.elements() {
+        match *el {
+            PathEl::MoveTo(p) => {
+                push(&mut out, &format!("M {} {}", num(p.x), num(p.y)));
+                started = true;
+            }
+            PathEl::LineTo(p) if started => push(&mut out, &format!("L {} {}", num(p.x), num(p.y))),
+            PathEl::QuadTo(a, b) if started => {
+                push(&mut out, &format!("Q {} {} {} {}", num(a.x), num(a.y), num(b.x), num(b.y)));
+            }
+            PathEl::CurveTo(a, b, c) if started => {
+                push(&mut out, &format!("C {} {} {} {} {} {}", num(a.x), num(a.y), num(b.x), num(b.y), num(c.x), num(c.y)));
+            }
+            PathEl::ClosePath if started => out.push_str(" Z"),
+            _ => {}
+        }
+    }
+    if out.is_empty() { None } else { Some(out) }
+}
+
+fn push(out: &mut String, cmd: &str) {
+    if !out.is_empty() {
+        out.push(' ');
+    }
+    out.push_str(cmd);
+}
+
+fn num(v: f64) -> String {
+    if !v.is_finite() {
+        return "0".into();
+    }
+    let s = format!("{v:.4}");
+    let s = s.trim_end_matches('0').trim_end_matches('.').to_string();
+    if s == "-0" { "0".into() } else { s }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use deckcraft_geom::preset::FillMode;
+    use deckcraft_model::{Geom, ShapeId};
+    use serde_json::json;
+
+    use crate::Session;
+
+    #[test]
+    fn every_icon_converts_and_a_second_subpath_keeps_its_own_origin() {
+        assert!(icons().len() >= 60);
+        for icon in icons() {
+            let bp = outline(icon.name).unwrap_or_else(|| panic!("{} did not parse", icon.name));
+            assert!(bp.elements().len() >= 2, "{}", icon.name);
+            let d = path_data(icon.name).unwrap_or_else(|| panic!("{}", icon.name));
+            assert!(d.starts_with('M'), "{d}");
+            let again = deckcraft_render::parse_path(&d);
+            assert!(!again.elements().is_empty(), "{}", icon.name);
+        }
+        // `m19 12…` is a second SVG element, not a continuation of the shaft.
+        let down = path_data("arrow-down").unwrap();
+        assert!(down.contains("M 19 12"), "{down}");
+        // Relative arcs in the star become cubics our renderer understands.
+        assert!(path_data("star").unwrap().contains(" C "), "{}", path_data("star").unwrap());
+        assert!(find("arrow_right").is_some_and(|i| i.name == "arrow-right"));
+        assert!(find("Star").is_some_and(|i| i.name == "star"));
+        assert!(find("nope").is_none());
+    }
+
+    #[test]
+    fn insert_icon_strokes_the_outline_and_round_trips_through_pptx() {
+        let mut s = Session::with_new();
+        assert!(s.execute("insert.icon", &json!({})).is_err());
+        assert!(s.execute("insert.icon", &json!({"name": "not-an-icon"})).is_err());
+        let listed = s.execute("insert.icons", &json!({})).unwrap();
+        assert!(listed.as_array().unwrap().iter().any(|i| i["name"] == "star" && i["category"] == "Marks"));
+
+        let before = s.doc().unwrap().shapes().len();
+        let id = s.execute("insert.icon", &json!({"name": "star", "rect": [100.0, 80.0, 72.0, 72.0]})).unwrap()["id"].as_u64().unwrap();
+        {
+            let st = s.doc().unwrap();
+            assert_eq!(st.shapes().len(), before + 1);
+            let sh = st.shape(ShapeId(id as u32)).unwrap();
+            assert_eq!(sh.name, "Star");
+            assert!(sh.fill.as_ref().is_some_and(|f| f.is_none()));
+            let Geom::Custom { paths } = &sh.geom else { panic!("{:?}", sh.geom) };
+            assert_eq!(paths.len(), 1);
+            assert_eq!(paths[0].fill, FillMode::None);
+            assert!(paths[0].stroke);
+            assert!((paths[0].w - VIEW).abs() < 1e-9 && (paths[0].h - VIEW).abs() < 1e-9);
+            assert!(paths[0].d.contains('M') && paths[0].d.contains('C'));
+            let width = sh.line.as_ref().and_then(|l| l.width).unwrap();
+            assert!((width - 6.0).abs() < 1e-6, "{width}");
+            let img = deckcraft_render::render_slide(&st.doc, st.selection.slide, &deckcraft_render::RenderOpts { scale: 2.0, ..Default::default() });
+            let ink = ink_in(&img, 100.0, 80.0, 72.0, 72.0, 2.0);
+            assert!(ink > 40, "star stroke pixels {ink}");
+            let mid = img.pixel((100.0 + 36.0) as u32 * 2, (80.0 + 36.0) as u32 * 2);
+            let sum = mid[0] as u16 + mid[1] as u16 + mid[2] as u16;
+            assert!(sum > 680, "a stroked star is hollow: {mid:?}");
+        }
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(s.doc().unwrap().shapes().len(), before);
+
+        s.execute("insert.icon", &json!({"name": "arrow-right", "rect": [200.0, 200.0, 96.0, 96.0]})).unwrap();
+        {
+            let st = s.doc().unwrap();
+            let sh = st.shapes().iter().find(|s| s.name == "Arrow right").unwrap();
+            let width = sh.line.as_ref().and_then(|l| l.width).unwrap();
+            assert!((width - 8.0).abs() < 1e-6, "{width}");
+            let img = deckcraft_render::render_slide(&st.doc, st.selection.slide, &deckcraft_render::RenderOpts { scale: 2.0, ..Default::default() });
+            assert!(ink_in(&img, 200.0, 200.0, 96.0, 96.0, 2.0) > 40);
+        }
+
+        let bytes = deckcraft_pptx::export(&s.doc().unwrap().doc).unwrap();
+        let p = deckcraft_pptx::import(&bytes).unwrap();
+        let sh = p.slides[0].shapes.iter().find(|s| s.name == "Arrow right").unwrap();
+        let Geom::Custom { paths } = &sh.geom else { panic!("{:?}", sh.geom) };
+        assert!(paths.iter().any(|path| path.fill == FillMode::None && path.stroke && path.d.contains('M')));
+        let width = sh.line.as_ref().and_then(|l| l.width).unwrap();
+        assert!((width - 8.0).abs() < 0.05, "{width}");
+    }
+
+    fn ink_in(img: &deckcraft_render::Image, x: f64, y: f64, w: f64, h: f64, scale: f64) -> usize {
+        let x0 = (x * scale).floor().max(0.0) as u32;
+        let y0 = (y * scale).floor().max(0.0) as u32;
+        let x1 = ((x + w) * scale).ceil().min(img.width as f64) as u32;
+        let y1 = ((y + h) * scale).ceil().min(img.height as f64) as u32;
+        let mut n = 0;
+        for yy in y0..y1 {
+            for xx in x0..x1 {
+                let p = img.pixel(xx, yy);
+                let sum = p[0] as u16 + p[1] as u16 + p[2] as u16;
+                if p[3] > 200 && sum < 680 {
+                    n += 1;
+                }
+            }
+        }
+        n
+    }
+}
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..02951bdc 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -11,6 +11,7 @@ pub mod cmd;
 pub mod connect;
 pub mod fonts;
 pub mod guard;
+pub mod icons;
 pub mod keys;
 pub mod links;
 pub mod recovery;
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..ae1141e6 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1041,8 +1041,8 @@ fn insert(app: &mut SlideApp, ui: &mut Ui) {
                 app.session.set_tool(deckcraft_engine::ToolKind::Shape { preset: p.to_string() });
             }
         });
-        let r = big_button(ui, Icon::Icons, "Icons", enabled(app, "shape.insert"));
-        egui::Popup::menu(&r).width(260.0).show(|ui| icon_library(app, ui));
+        let r = big_button(ui, Icon::Icons, "Icons", enabled(app, "insert.icon"));
+        egui::Popup::menu(&r).width(340.0).show(|ui| icon_library(app, ui));
         big(app, ui, Icon::SmartArt, "SmartArt", "app.dialog", json!({"id": "smartart"}));
         let r = big_button(ui, Icon::Chart, "Chart", enabled(app, "insert.chart"));
         egui::Popup::menu(&r).show(|ui| {
@@ -1122,53 +1122,98 @@ pub fn table_grid_picker(ui: &mut Ui) -> Option<(usize, usize)> {
     if resp.clicked() && hover.0 > 0 { Some(hover) } else { None }
 }
 
-/// A small built-in icon library: our own simple pictograms built from preset shapes.
+/// Lucide stroke icons (Insert › Icons). Search filters the gallery; a click inserts the outline.
 fn icon_library(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
-    let items: [(&str, &str); 24] = [
-        ("star5", "Star"),
-        ("heart", "Heart"),
-        ("lightningBolt", "Lightning"),
-        ("sun", "Sun"),
-        ("moon", "Moon"),
-        ("cloud", "Cloud"),
-        ("smileyFace", "Smile"),
-        ("noSmoking", "Not allowed"),
-        ("mathPlus", "Plus"),
-        ("mathMultiply", "Multiply"),
-        ("mathEqual", "Equals"),
-        ("chevron", "Chevron"),
-        ("rightArrow", "Arrow"),
-        ("quadArrow", "Move"),
-        ("uturnArrow", "Return"),
-        ("flowChartDecision", "Decision"),
-        ("flowChartMagneticDisk", "Database"),
-        ("flowChartDocument", "Document"),
-        ("wedgeRoundRectCallout", "Speech"),
-        ("cloudCallout", "Thought"),
-        ("teardrop", "Pin"),
-        ("donut", "Ring"),
-        ("irregularSeal1", "Burst"),
-        ("ribbon2", "Banner"),
-    ];
-    ui.horizontal_wrapped(|ui| {
-        for (preset, label) in items {
-            let (r, resp) = ui.allocate_exact_size(vec2(36.0, 36.0), Sense::click());
-            if resp.hovered() {
-                ui.painter().rect_filled(r, CornerRadius::same(4), t.hover);
+    let (color, hover) = (t.text, t.hover);
+    let id = ui.id().with("icon-query");
+    let mut query = ui.data_mut(|d| d.get_temp::<String>(id).unwrap_or_default());
+    ui.add(egui::TextEdit::singleline(&mut query).hint_text("Search icons").desired_width(ui.available_width()));
+    let q = query.trim().to_lowercase();
+    ui.data_mut(|d| d.insert_temp(id, query));
+    let icons = deckcraft_engine::icons::icons();
+    egui::ScrollArea::vertical().id_salt("icon-scroll").max_height(420.0).show(ui, |ui| {
+        if q.is_empty() {
+            let mut cats: Vec<&str> = Vec::new();
+            for icon in icons {
+                if !cats.contains(&icon.category) {
+                    cats.push(icon.category);
+                }
             }
-            paint_preset(ui.painter(), r.shrink(6.0), preset, t.text, t.text);
-            if resp.on_hover_text(label).clicked() {
-                let size = app.session.active().map(|d| d.doc.slide_size).unwrap_or(deckcraft_model::defaults::WIDE);
-                let _ = app.run("shape.insert", json!({"preset": preset, "rect": [size.width / 2.0 - 48.0, size.height / 2.0 - 48.0, 96, 96]}));
-                let _ = app.run("shape.fill", json!({"color": "tx1"}));
-                let _ = app.run("shape.line", json!({"none": true}));
-                ui.close();
+            for cat in cats {
+                ui.label(egui::RichText::new(cat).small().strong());
+                ui.horizontal_wrapped(|ui| {
+                    for icon in icons.iter().filter(|i| i.category == cat) {
+                        icon_cell(app, ui, icon, color, hover);
+                    }
+                });
+            }
+        } else {
+            let mut n = 0;
+            ui.horizontal_wrapped(|ui| {
+                for icon in icons {
+                    if icon.name.contains(&q) || icon.label.to_lowercase().contains(&q) {
+                        icon_cell(app, ui, icon, color, hover);
+                        n += 1;
+                    }
+                }
+            });
+            if n == 0 {
+                ui.label("No icons match.");
             }
         }
     });
 }
 
+fn icon_cell(app: &mut SlideApp, ui: &mut Ui, icon: &deckcraft_engine::icons::Icon, color: Color32, hover: Color32) {
+    let (r, resp) = ui.allocate_exact_size(vec2(36.0, 36.0), Sense::click());
+    if resp.hovered() {
+        ui.painter().rect_filled(r, CornerRadius::same(4), hover);
+    }
+    paint_icon(ui.painter(), r.shrink(6.0), icon, color);
+    if resp.on_hover_text(icon.label).clicked() {
+        let _ = app.run("insert.icon", json!({"name": icon.name}));
+        ui.close();
+    }
+}
+
+/// Stroke a Lucide outline into a gallery cell. The line is the design stroke scaled to the cell.
+fn paint_icon(p: &egui::Painter, r: Rect, icon: &deckcraft_engine::icons::Icon, color: Color32) {
+    let Some(src) = deckcraft_engine::icons::outline(icon.name) else { return };
+    let mut bp = src.clone();
+    let (w, h) = (r.width().max(1.0) as f64, r.height().max(1.0) as f64);
+    bp.apply_affine(deckcraft_geom::Affine::scale_non_uniform(w / deckcraft_engine::icons::VIEW, h / deckcraft_engine::icons::VIEW));
+    let sw = ((r.width() * icon.stroke as f32) / deckcraft_engine::icons::VIEW as f32).clamp(1.0, 3.5);
+    let mut pts: Vec<egui::Pos2> = vec![];
+    let mut polys: Vec<(Vec<egui::Pos2>, bool)> = vec![];
+    kurbo_flatten(&bp, |el| match el {
+        Fl::Move(x, y) => {
+            if pts.len() > 1 {
+                polys.push((std::mem::take(&mut pts), false));
+            }
+            pts.clear();
+            pts.push(pos2(r.min.x + x as f32, r.min.y + y as f32));
+        }
+        Fl::Line(x, y) => pts.push(pos2(r.min.x + x as f32, r.min.y + y as f32)),
+        Fl::Close => {
+            if pts.len() > 1 {
+                polys.push((std::mem::take(&mut pts), true));
+            }
+        }
+    });
+    if pts.len() > 1 {
+        polys.push((pts, false));
+    }
+    for (poly, closed) in polys {
+        p.add(egui::Shape::Path(egui::epaint::PathShape {
+            points: poly,
+            closed,
+            fill: Color32::TRANSPARENT,
+            stroke: egui::epaint::PathStroke::new(sw, color),
+        }));
+    }
+}
+
 // ---------- Draw ----------
 
 fn draw(app: &mut SlideApp, ui: &mut Ui) {
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..99d4b13d 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Icons places a Lucide stroke set; 3-D models and stock content remain; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -188,7 +188,7 @@ Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1
 sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
 matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
-encryption), ink to shape/text (6–10 h), icons and 3-D models (8–14 h, needs an open icon set).
+encryption), ink to shape/text (6–10 h), 3-D models and stock content (6–10 h; Insert › Icons places a Lucide stroke set).
 
 ## UI/UX
 
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Insert › Icons places Lucide 1.56.0 stroke icons as custom shapes. The checklist row stays missing until 3-D models and stock content exist |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..32f08d5a 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (media remainder no longer lists icons: Insert › Icons is a Lucide stroke set; percentages unchanged; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -192,7 +192,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Charts | 7 | 65% | ~45% | 12–20 | Data grid editing, chart elements, the `chartex` types (waterfall, funnel, treemap, sunburst, histogram, box) | [parity-checklist.md](parity-checklist.md) |
 | SmartArt | 4 | 33% | ~25% | 10–16 | Text pane, layout switching, the diagram data model on save | [parity-checklist.md](parity-checklist.md) |
 | Pictures | 7 | 48% | ~45% | 12–20 | SVG/EMF/WMF, clipboard paste on Windows/Linux (#53), artistic effects, remove background, compress | [file-format-parity.md](file-format-parity.md) |
-| Media | 4 | 67% | ~60% | 8–14 | WMA/WMV decode, record audio/screen, icons and 3-D models, playback options lost on PPTX round trip (#74) | [file-format-parity.md](file-format-parity.md) |
+| Media | 4 | 67% | ~60% | 8–14 | WMA/WMV decode, record audio/screen, 3-D models and stock content, playback options lost on PPTX round trip (#74) | [file-format-parity.md](file-format-parity.md) |
 | Transitions | 4 | 92% | ~80% | 4–8 | Transition sounds, 3-D transitions approximated in 2-D | [animation-parity.md](animation-parity.md) |
 | Animations | 6 | 79% | ~65% | 10–16 | 64 of PowerPoint's ~190 effects, Animation Pane timeline, preview, rewind lost on save (#77) | [animation-parity.md](animation-parity.md) |
 | Slide show and presenter view | 8 | 66% | ~60% | 10–16 | Second-display placement, laser pointer, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Media remainder: Insert › Icons places Lucide stroke icons. 3-D models and stock content remain. Headline percentages unchanged; the checklist row stays missing |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..846eb09b 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Icons is a Lucide stroke gallery; ribbon icons stay original drawings; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -127,8 +127,9 @@ Alt+Shift+arrows in text are handled elsewhere (#78, #93).
 ## Visual fidelity
 
 Colours, spacing, ribbon card and tab geometry follow the observations in
-`plan/powerpoint/01-observed-ui.md`; icons are original (~240, drawn in code or Lucide) and must not
-imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been run since
+`plan/powerpoint/01-observed-ui.md`; the ribbon and menu icons are original (~240, drawn in code)
+and must not imitate Microsoft's. Insert › Icons places Lucide stroke icons (ISC, release 1.56.0)
+on the slide as shapes. No pixel comparison against PowerPoint screenshots has been run since
 2026-10-07. Cross-app icon consistency is open (#73, #56).
 
 ## Estimates
@@ -148,6 +149,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Insert › Icons is a searchable gallery of Lucide stroke icons inserted as shapes. Ribbon chrome stays original drawings |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 8bc7e55561af84941bf661d778198a6a223d46ad Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:34:33 +0300
Subject: [PATCH 236/376] Spelling: squiggles in table cells and notes;
 UI-thread checking on the web

---
 crates/engine/src/cmd/review.rs      |  68 ++--
 crates/engine/src/cmd/text.rs        |  34 ++
 crates/render/src/lib.rs             |   1 +
 crates/render/src/table.rs           |   2 +-
 crates/ui-egui/src/canvas.rs         |   9 +-
 crates/ui-egui/src/dialogs.rs        |  41 ++-
 crates/ui-egui/src/spelling_tests.rs |  74 ++++-
 crates/ui-egui/src/squiggles.rs      | 459 +++++++++++++++++++--------
 crates/ui-egui/src/status.rs         |  35 +-
 docs/gaps.md                         |  10 +-
 10 files changed, 562 insertions(+), 171 deletions(-)

diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 54751567..d11d19e9 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -16,13 +16,13 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("comment.resolve", "Resolve Thread", ["Comments"], None, "{index, resolved?: bool}", has_slide, resolve),
         cmd!(query "comment.list", "Comments", [], None, "{slide?} → comments", has_slide, list),
         cmd!(query "review.accessibility", "Check Accessibility", ["Review", "Accessibility"], None, "{} → [{slide, shape, issue}]", has_doc, accessibility),
-        cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{lang?, ignore?:[word]} → [{slide, shape, para, start, end, word, lang, suggestions}] (each run in its own language, lang? for runs without one; Hunspell dictionaries installed on the system, else a built-in list of common misspellings)", has_doc, spelling),
+        cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{lang?, ignore?:[word]} → [{slide, shape?, row?, col?, notes?, para, start, end, word, lang, suggestions}] (shapes, table cells and notes; each run in its own language, lang? for runs without one; Hunspell dictionaries installed on the system, else a built-in list of common misspellings)", has_doc, spelling),
         cmd!(
             "review.spellingChange",
             "Change Spelling",
             ["Review", "Proofing"],
             None,
-            "{shape, word, to, all?, para?, start?} → {changed} (replace the whole word in that shape's text, the one at para/start, or in every shape with all)",
+            "{shape, word, to, all?, para?, start?, row?, col?} → {changed} (replace the whole word in that shape's text, the one at para/start, or in every shape with all)",
             has_doc,
             spelling_change
         ),
@@ -234,26 +234,48 @@ fn spelling(s: &mut Session, p: &Value) -> Result<Value> {
         p.get("ignore").and_then(Value::as_array).map(|a| a.iter().filter_map(Value::as_str).map(str::to_lowercase).collect()).unwrap_or_default();
     let mut dicts: std::collections::HashMap<String, Option<Arc<crate::spell::Dictionary>>> = Default::default();
     let mut out = vec![];
+    // Each misspelt word of `para`, reported with `at` (where the paragraph is) merged in.
+    let mut check = |para: &deckcraft_model::Paragraph, at: Value, out: &mut Vec<Value>| {
+        for w in crate::spell::paragraph_words(para, &default) {
+            if ignore.contains(&w.text.to_lowercase()) {
+                continue;
+            }
+            let dict = dicts.entry(w.lang.clone()).or_insert_with(|| crate::spell::dictionary(&w.lang)).clone();
+            let bad = match &dict {
+                Some(d) => !crate::spell::is_correct(d, &w.text),
+                None => COMMON.contains(&w.text.to_lowercase().as_str()),
+            };
+            if bad {
+                let sug = dict.as_ref().map(|d| d.suggest(&w.text, 5)).unwrap_or_default();
+                let mut v = json!({"start": w.start, "end": w.end, "word": w.text, "lang": w.lang, "suggestions": sug});
+                if let (Some(o), Some(a)) = (v.as_object_mut(), at.as_object()) {
+                    o.extend(a.clone());
+                }
+                out.push(v);
+            }
+        }
+    };
     for (i, sl) in st.doc.slides.iter().enumerate() {
         deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
-            let Some(t) = &sh.text else { return };
-            for (pi, para) in t.paragraphs.iter().enumerate() {
-                for w in crate::spell::paragraph_words(para, &default) {
-                    if ignore.contains(&w.text.to_lowercase()) {
-                        continue;
-                    }
-                    let dict = dicts.entry(w.lang.clone()).or_insert_with(|| crate::spell::dictionary(&w.lang)).clone();
-                    let bad = match &dict {
-                        Some(d) => !crate::spell::is_correct(d, &w.text),
-                        None => COMMON.contains(&w.text.to_lowercase().as_str()),
-                    };
-                    if bad {
-                        let sug = dict.as_ref().map(|d| d.suggest(&w.text, 5)).unwrap_or_default();
-                        out.push(json!({"slide": i, "shape": sh.id, "para": pi, "start": w.start, "end": w.end, "word": w.text, "lang": w.lang, "suggestions": sug}));
+            if let Some(t) = &sh.text {
+                for (pi, para) in t.paragraphs.iter().enumerate() {
+                    check(para, json!({"slide": i, "shape": sh.id, "para": pi}), &mut out);
+                }
+            }
+            if let deckcraft_model::ShapeKind::Table(tb) = &sh.kind {
+                for (r, row) in tb.rows.iter().enumerate() {
+                    for (c, cell) in row.cells.iter().enumerate().filter(|(_, c)| !c.is_covered()) {
+                        for (pi, para) in cell.text.paragraphs.iter().enumerate() {
+                            check(para, json!({"slide": i, "shape": sh.id, "row": r, "col": c, "para": pi}), &mut out);
+                        }
                     }
                 }
             }
         });
+        // Speaker notes, a paragraph per line.
+        for (pi, para) in sl.notes.paragraphs.iter().enumerate() {
+            check(para, json!({"slide": i, "notes": true, "para": pi}), &mut out);
+        }
     }
     Ok(Value::Array(out))
 }
@@ -299,11 +321,16 @@ fn spelling_change(s: &mut Session, p: &Value) -> Result<Value> {
     if let (Some(id), Some(para), Some(start)) = (shape, usize_param(p, "para"), usize_param(p, "start")) {
         let id = deckcraft_model::ShapeId(u32::try_from(id).map_err(|_| bad("review.spellingChange", "bad `shape`"))?);
         let end = start + word.chars().count();
+        let cell = usize_param(p, "row").zip(usize_param(p, "col"));
         let slide = {
             let st = s.doc()?;
             let found = st.doc.slides.iter().position(|sl| {
                 deckcraft_model::find_shape(&sl.shapes, id)
-                    .and_then(|sh| sh.text.as_ref()?.paragraphs.get(para))
+                    .and_then(|sh| match (cell, &sh.kind) {
+                        (Some((r, c)), deckcraft_model::ShapeKind::Table(tb)) => tb.cell(r, c)?.text.paragraphs.get(para),
+                        (Some(_), _) => None,
+                        (None, _) => sh.text.as_ref()?.paragraphs.get(para),
+                    })
                     .is_some_and(|pp| pp.text().chars().skip(start).take(end - start).collect::<String>() == word)
             });
             found.ok_or_else(|| bad("review.spellingChange", "the word isn't there"))?
@@ -311,7 +338,12 @@ fn spelling_change(s: &mut Session, p: &Value) -> Result<Value> {
         s.edit(|doc, _| {
             let sl = doc.slides.get_mut(slide).ok_or_else(|| bad("review.spellingChange", "no slide"))?;
             let sh = deckcraft_model::find_shape_mut(&mut Arc::make_mut(sl).shapes, id).ok_or_else(|| bad("review.spellingChange", "no shape"))?;
-            if let Some(pp) = sh.text.as_mut().and_then(|t| t.paragraphs.get_mut(para)) {
+            let pp = match (cell, &mut sh.kind) {
+                (Some((r, c)), deckcraft_model::ShapeKind::Table(tb)) => tb.cell_mut(r, c).and_then(|cl| cl.text.paragraphs.get_mut(para)),
+                (Some(_), _) => None,
+                (None, _) => sh.text.as_mut().and_then(|t| t.paragraphs.get_mut(para)),
+            };
+            if let Some(pp) = pp {
                 replace_chars(pp, start, end, &to);
             }
             Ok(())
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index cae4f319..f26b270f 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -506,6 +506,40 @@ pub fn range_underlines(
     out
 }
 
+/// Like [`range_underlines`], for the text of table `id`'s cell at `row`, `col`.
+pub fn cell_range_underlines(
+    st: &DocState,
+    id: deckcraft_model::ShapeId,
+    row: usize,
+    col: usize,
+    ranges: &[(usize, usize, usize)],
+) -> Vec<(deckcraft_geom::Point, deckcraft_geom::Point)> {
+    let Some(sh) = st.shape(id) else { return vec![] };
+    let deckcraft_model::ShapeKind::Table(tb) = &sh.kind else { return vec![] };
+    let (Some(cell), Some(ctx)) = (tb.cell(row, col), ctx_for(&st.doc, &st.selection)) else { return vec![] };
+    let heights = crate::cmd::table_drawn_heights(&st.doc, &st.selection, tb);
+    let Some(rect) = deckcraft_render::table_cell_rects(tb, &heights).into_iter().find(|(r, c, _)| *r == row && *c == col).map(|(_, _, r)| r) else {
+        return vec![];
+    };
+    let body = deckcraft_render::table_cell_body(&ctx, tb, row, col, cell);
+    let tmp = deckcraft_model::Shape { text: Some(body.clone()), ..Default::default() };
+    let l = deckcraft_text::layout(
+        &ctx,
+        &tmp,
+        &body,
+        &deckcraft_text::Opts { rect, fields: &deckcraft_text::NoFields, prompt_color: None, no_shrink: false },
+    );
+    let x = xfrm_of(&st.doc, &st.selection, sh);
+    let m = deckcraft_render::text_transform(x.affine(), rect, l.rotation);
+    let mut out = vec![];
+    for &(para, a, b) in ranges {
+        for (x0, x1, y) in l.composition_underlines(deckcraft_text::Pos { para, ch: a }, deckcraft_text::Pos { para, ch: b }) {
+            out.push((m * deckcraft_geom::Point::new(x0, y), m * deckcraft_geom::Point::new(x1, y)));
+        }
+    }
+    out
+}
+
 pub fn composition_underlines(st: &DocState) -> Vec<(deckcraft_geom::Point, deckcraft_geom::Point, bool)> {
     let (Some(c), Some(t)) = (&st.composition, &st.selection.text) else { return vec![] };
     let Some(sh) = st.shape(t.shape) else { return vec![] };
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..e39b3e69 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -51,6 +51,7 @@ pub use morph_path::PathMorph;
 pub use morph_text::TextMorph;
 pub use placed::{Placed, PlacedLink, PlacedText, place_slide};
 pub use table::row_heights as table_row_heights;
+pub use table::{cell_body as table_cell_body, cell_rects as table_cell_rects};
 pub use transition::{SlideParts, composite_transition, render_transition};
 
 /// Largest pixmap side we render (vello_cpu uses u16 sizes).
diff --git a/crates/render/src/table.rs b/crates/render/src/table.rs
index c84e1172..4c8089b2 100644
--- a/crates/render/src/table.rs
+++ b/crates/render/src/table.rs
@@ -224,7 +224,7 @@ fn edges(sizes: &[f64]) -> Vec<f64> {
 }
 
 /// A cell's text as drawn: its margins, anchor and direction, plus the table style's text colour and bold.
-pub(crate) fn cell_body(rctx: &Ctx, t: &Table, r: usize, c: usize, cell: &Cell) -> TextBody {
+pub fn cell_body(rctx: &Ctx, t: &Table, r: usize, c: usize, cell: &Cell) -> TextBody {
     let lk = look(rctx, t, r, c);
     let mut body = cell.text.clone();
     let [ml, mr, mt, mb] = cell.margins.unwrap_or([7.2, 7.2, 3.6, 3.6]);
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 3cd56b93..a2a4a967 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -643,7 +643,14 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
             }
             for to in &w.suggestions {
                 if ui.button(egui::RichText::new(to).strong()).clicked() {
-                    let _ = app.run("review.spellingChange", json!({"shape": w.shape, "para": w.para, "start": w.start, "word": w.word, "to": to}));
+                    let p = match w.tag {
+                        crate::squiggles::Tag::Shape { id, para } => json!({"shape": id, "para": para, "start": w.start, "word": w.word, "to": to}),
+                        crate::squiggles::Tag::Cell { id, row, col, para } => {
+                            json!({"shape": id, "row": row, "col": col, "para": para, "start": w.start, "word": w.word, "to": to})
+                        }
+                        crate::squiggles::Tag::Notes { .. } => json!({}),
+                    };
+                    let _ = app.run("review.spellingChange", p);
                     app.squiggles.menu_word = None;
                     ui.close();
                 }
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 67f2826f..c2380db3 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -575,9 +575,44 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                                 let r = ui.small_button(to.as_str()).on_hover_text("Click to change this one; Shift-click to change all");
                                 if r.clicked() {
                                     let all = ui.input(|i| i.modifiers.shift);
-                                    let p =
-                                        if all { json!({"word": w, "to": to, "all": true}) } else { json!({"shape": shape, "word": w, "to": to}) };
-                                    run(app, "review.spellingChange", p);
+                                    if item.get("notes").and_then(Value::as_bool).unwrap_or(false) {
+                                        // A word in the notes: change that line of the slide's notes.
+                                        let si = slide.as_u64().unwrap_or(0) as usize;
+                                        let notes =
+                                            app.session.active().and_then(|d| d.doc.slides.get(si)).map(|s| s.notes_text()).unwrap_or_default();
+                                        let (pi, st) = (
+                                            item.get("para").and_then(Value::as_u64).unwrap_or(0) as usize,
+                                            item.get("start").and_then(Value::as_u64).unwrap_or(0) as usize,
+                                        );
+                                        let lines: Vec<String> = notes
+                                            .split('\n')
+                                            .enumerate()
+                                            .map(|(i, l)| {
+                                                if i != pi {
+                                                    return l.to_string();
+                                                }
+                                                let c: Vec<char> = l.chars().collect();
+                                                let n = w.chars().count();
+                                                if c.get(st..st + n).is_some_and(|x| x.iter().collect::<String>() == w) {
+                                                    c[..st].iter().chain(to.chars().collect::<Vec<_>>().iter()).chain(c[st + n..].iter()).collect()
+                                                } else {
+                                                    l.to_string()
+                                                }
+                                            })
+                                            .collect();
+                                        run(app, "slide.notes", json!({"text": lines.join("\n"), "index": si}));
+                                    } else {
+                                        let mut p = if all {
+                                            json!({"word": w, "to": to, "all": true})
+                                        } else {
+                                            json!({"shape": shape, "word": w, "to": to, "para": item.get("para"), "start": item.get("start")})
+                                        };
+                                        if !all && let (Some(o), Some(r), Some(c)) = (p.as_object_mut(), item.get("row"), item.get("col")) {
+                                            o.insert("row".into(), r.clone());
+                                            o.insert("col".into(), c.clone());
+                                        }
+                                        run(app, "review.spellingChange", p);
+                                    }
                                 }
                             }
                         });
diff --git a/crates/ui-egui/src/spelling_tests.rs b/crates/ui-egui/src/spelling_tests.rs
index 7d9b5537..725ae508 100644
--- a/crates/ui-egui/src/spelling_tests.rs
+++ b/crates/ui-egui/src/spelling_tests.rs
@@ -97,10 +97,7 @@ fn squiggles_mark_misspelt_words_in_the_background() {
     let w = h.state().squiggles.word_at(&st, deckcraft_geom::Point::new(a.x + 5.0, a.y - 5.0), 2.0).unwrap();
     assert_eq!(w.word, "plna");
     assert_eq!(w.suggestions.first().map(String::as_str), Some("plan"));
-    h.state_mut()
-        .session
-        .execute("review.spellingChange", &json!({"shape": id, "para": w.para, "start": w.start, "word": w.word, "to": "plan"}))
-        .unwrap();
+    h.state_mut().session.execute("review.spellingChange", &json!({"shape": id, "para": 0, "start": w.start, "word": w.word, "to": "plan"})).unwrap();
     h.state_mut().session.execute("review.addToDictionary", &json!({"word": "reveiw"})).unwrap();
     let st = h.state().session.active().unwrap().clone();
     assert_eq!(h.state_mut().squiggles.settle(&st).len(), 1);
@@ -113,3 +110,72 @@ fn squiggles_mark_misspelt_words_in_the_background() {
     assert_eq!(h.state_mut().squiggles.settle(&st).len(), 0, "the word being typed isn't marked");
     let _ = std::fs::remove_dir_all(&dir);
 }
+
+/// Table cells and speaker notes are squiggled too, and the UI-thread checker (the web build's)
+/// gets there a few milliseconds per frame.
+#[test]
+fn squiggles_in_table_cells_and_notes_and_on_the_ui_thread() {
+    let aff = "SET UTF-8\nTRY esianrtolcdugmphbyfvkwzxjq\nSFX S Y 1\nSFX S 0 s .\n";
+    let dic = "10\nthe/S\nplan/S\nsales\nregion/S\ntotal/S\nnorth\nsouth\nremember\nto\nshow\n";
+    deckcraft_engine::spell::install("xx-TB", deckcraft_engine::spell::Dictionary::parse(aff.as_bytes(), dic.as_bytes()));
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.squiggles.force_inline = true;
+    app.session.execute("slide.layout", &json!({"layout": "blank"})).ok();
+    let id = app.session.execute("insert.table", &json!({"rows": 2, "cols": 2, "rect": [80, 80, 600, 160]})).unwrap()["id"].as_u64().unwrap();
+    let sid = deckcraft_model::ShapeId(id as u32);
+    let lang = deckcraft_model::RunProps { lang: Some("xx-TB".into()), size: Some(28.0), ..Default::default() };
+    app.session
+        .edit(|doc, _| {
+            let sl = std::sync::Arc::make_mut(&mut doc.slides[0]);
+            sl.notes = deckcraft_model::TextBody {
+                paragraphs: vec![deckcraft_model::Paragraph {
+                    runs: vec![deckcraft_model::Run::with("Remmeber to show the totl", lang.clone())],
+                    ..Default::default()
+                }],
+                ..Default::default()
+            };
+            let sh = deckcraft_model::find_shape_mut(&mut sl.shapes, sid).unwrap();
+            let deckcraft_model::ShapeKind::Table(tb) = &mut sh.kind else { panic!("not a table") };
+            for (r, c, t) in [(0, 0, "Regoin"), (0, 1, "Sales"), (1, 0, "North"), (1, 1, "Soth totals")] {
+                tb.cell_mut(r, c).unwrap().text.paragraphs =
+                    vec![deckcraft_model::Paragraph { runs: vec![deckcraft_model::Run::with(t, lang.clone())], ..Default::default() }];
+            }
+            Ok(())
+        })
+        .unwrap();
+    app.session.execute("edit.select", &json!({"ids": []})).unwrap();
+    let st = app.session.active().unwrap().clone();
+    let lines = app.squiggles.settle(&st);
+    assert_eq!(lines.len(), 2, "Regoin and Soth: {lines:?}");
+    // Each under its own cell: the first in the top-left one, the second in the bottom-right one.
+    assert!(lines[0].0.x < 380.0 && lines[0].0.y < 160.0 && lines[1].0.x > 380.0 && lines[1].0.y > 160.0, "{lines:?}");
+    assert_eq!(app.squiggles.settle_notes("Remmeber to show the totl", "xx-TB"), vec![(0, 8), (21, 25)]);
+    let mut h = Harness::builder().with_size(egui::vec2(1100.0, 760.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(6);
+    if let (Ok(path), Ok(img)) = (std::env::var("DECKCRAFT_PNG_OUT_TABLE"), h.render()) {
+        let _ = img.save(path);
+    }
+    // Correcting a cell's word through the context menu's command (settled again: frames may
+    // have moved the document on).
+    let st = h.state().session.active().unwrap().clone();
+    let lines = h.state_mut().squiggles.settle(&st);
+    let (a, _) = lines[0];
+    let w = h.state().squiggles.word_at(&st, deckcraft_geom::Point::new(a.x + 3.0, a.y - 5.0), 2.0).unwrap();
+    assert_eq!((w.word.as_str(), w.suggestions.first().map(String::as_str)), ("Regoin", Some("Region")));
+    h.state_mut()
+        .session
+        .execute("review.spellingChange", &json!({"shape": id, "row": 0, "col": 0, "para": 0, "start": w.start, "word": w.word, "to": "Region"}))
+        .unwrap();
+    let st = h.state().session.active().unwrap().clone();
+    assert_eq!(h.state_mut().squiggles.settle(&st).len(), 1);
+    // The Spelling dialog's list has the cell and the notes too.
+    let v = h.state_mut().session.execute("review.spelling", &json!({})).unwrap();
+    let words: Vec<&str> = v.as_array().unwrap().iter().filter_map(|w| w["word"].as_str()).collect();
+    assert_eq!(words, vec!["Soth", "Remmeber", "totl"]);
+}
diff --git a/crates/ui-egui/src/squiggles.rs b/crates/ui-egui/src/squiggles.rs
index 17e55fdf..ce9f6480 100644
--- a/crates/ui-egui/src/squiggles.rs
+++ b/crates/ui-egui/src/squiggles.rs
@@ -1,9 +1,12 @@
-//! Spelling squiggles: misspelt words on the current slide get a red wavy underline, checked on a
-//! worker thread so typing never waits for a dictionary. Results are for one version of the
-//! document; while a newer check runs, nothing stale is drawn. The word being typed (the caret at
-//! or inside it) isn't marked, as in PowerPoint. The web build has no worker and shows none.
+//! Spelling squiggles: misspelt words on the current slide (shapes and table cells) and in the
+//! speaker notes get a red wavy underline. Checks run on a worker thread so typing never waits for
+//! a dictionary; the web build has no threads, so there the same checker runs on the UI thread a
+//! few milliseconds per frame until it is done. Results are for one version of the text; while a
+//! newer check runs nothing stale is drawn. The word the caret is in isn't marked, as in
+//! PowerPoint.
 
 use std::collections::HashMap;
+use std::hash::{Hash, Hasher};
 use std::sync::Arc;
 use std::sync::mpsc::{Receiver, Sender, channel};
 
@@ -11,85 +14,146 @@ use deckcraft_engine::DocState;
 use deckcraft_geom::Point;
 use deckcraft_model::{Paragraph, ShapeId};
 
-/// What a check is for: the document version, the slide and the user dictionary version.
+/// Milliseconds of checking per frame on the UI thread (the web build).
+pub const FRAME_BUDGET_MS: f64 = 4.0;
+
+/// Where a checked paragraph is.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum Tag {
+    Shape {
+        id: ShapeId,
+        para: usize,
+    },
+    Cell {
+        id: ShapeId,
+        row: usize,
+        col: usize,
+        para: usize,
+    },
+    /// A line of the notes, starting at character `start` of the notes text.
+    Notes {
+        start: usize,
+    },
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub struct Key {
-    doc: usize,
-    rev: u64,
-    slide: usize,
+enum Kind {
+    Slide,
+    Notes,
+}
+
+/// What a check is for: a hash of the text's identity, and the user dictionary version.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+struct Key {
+    of: u64,
     user: u64,
 }
 
 struct Job {
+    kind: Kind,
     key: Key,
     default_lang: String,
-    paras: Vec<(ShapeId, usize, Paragraph)>,
+    paras: Vec<(Tag, Paragraph)>,
     repaint: Option<egui::Context>,
 }
 
-/// Misspelt ranges for one key: `(shape, para, start, end)`.
+/// Misspelt character ranges, per paragraph.
 struct Done {
+    kind: Kind,
     key: Key,
-    ranges: Vec<(ShapeId, usize, usize, usize)>,
+    ranges: Vec<(Tag, usize, usize)>,
 }
 
+fn now_ms() -> f64 {
+    #[cfg(target_arch = "wasm32")]
+    {
+        js_sys::Date::now()
+    }
+    #[cfg(not(target_arch = "wasm32"))]
+    {
+        static T0: std::sync::OnceLock<std::time::Instant> = std::sync::OnceLock::new();
+        T0.get_or_init(std::time::Instant::now).elapsed().as_secs_f64() * 1000.0
+    }
+}
+
+/// The checking itself, step by step: the newest job of each kind, a paragraph at a time, with
+/// results cached by paragraph content (typing re-checks only the paragraph typed in).
 #[derive(Default)]
-pub struct Squiggles {
-    tx: Option<Sender<Job>>,
-    rx: Option<Receiver<Done>>,
-    /// The check in flight, if any.
-    pending: Option<Key>,
-    done: Option<Done>,
-    /// Underlines in slide coordinates for `done`, with each one's word: `(shape, para, start, end)`.
-    lines: Vec<((ShapeId, usize, usize, usize), Point, Point)>,
-    /// Off (tests or the setting).
-    pub disabled: bool,
-    /// The misspelt word a context menu is open on.
-    pub menu_word: Option<MenuWord>,
-    /// Words skipped with Ignore All this session (lower-case).
-    ignored: Vec<String>,
+struct Checker {
+    cache: HashMap<u64, Vec<(usize, usize)>>,
+    user: Option<u64>,
+    /// Jobs with how far they got and what they found so far.
+    jobs: Vec<(Job, usize, Vec<(Tag, usize, usize)>)>,
 }
 
-/// A misspelt word under the pointer, with corrections.
-#[derive(Clone, Debug)]
-pub struct MenuWord {
-    pub shape: ShapeId,
-    pub para: usize,
-    pub start: usize,
-    pub word: String,
-    pub suggestions: Vec<String>,
+fn hash_of(v: &impl Hash) -> u64 {
+    let mut h = std::collections::hash_map::DefaultHasher::new();
+    v.hash(&mut h);
+    h.finish()
+}
+
+impl Checker {
+    fn push(&mut self, job: Job) {
+        self.jobs.retain(|(j, _, _)| j.kind != job.kind);
+        self.jobs.push((job, 0, vec![]));
+    }
+
+    fn idle(&self) -> bool {
+        self.jobs.is_empty()
+    }
+
+    /// Check until `budget_ms` is spent (or everything is done); finished jobs.
+    fn step(&mut self, budget_ms: f64) -> Vec<(Done, Option<egui::Context>)> {
+        let t0 = now_ms();
+        let mut out = vec![];
+        while let Some((job, at, found)) = self.jobs.first_mut() {
+            if self.user != Some(job.key.user) {
+                self.cache.clear();
+                self.user = Some(job.key.user);
+            }
+            while *at < job.paras.len() {
+                let (tag, p) = &job.paras[*at];
+                let k = hash_of(&(serde_json::to_string(&p.runs).unwrap_or_default(), &job.default_lang));
+                let r = self
+                    .cache
+                    .entry(k)
+                    .or_insert_with(|| deckcraft_engine::spell::misspelt(p, &job.default_lang, &[]).into_iter().map(|w| (w.start, w.end)).collect());
+                found.extend(r.iter().map(|(a, b)| (*tag, *a, *b)));
+                *at += 1;
+                if now_ms() - t0 > budget_ms {
+                    return out;
+                }
+            }
+            let (job, _, ranges) = self.jobs.remove(0);
+            out.push((Done { kind: job.kind, key: job.key, ranges }, job.repaint));
+        }
+        if self.cache.len() > 20_000 {
+            self.cache.clear();
+        }
+        out
+    }
 }
 
 fn worker(rx: Receiver<Job>, tx: Sender<Done>) {
-    // Paragraph results by content, so typing in one paragraph re-checks only that one.
-    let mut cache: HashMap<(String, u64), Vec<(usize, usize)>> = HashMap::new();
-    let mut user = None;
-    while let Ok(mut job) = rx.recv() {
-        // Only the newest job matters.
+    let mut c = Checker::default();
+    loop {
+        if c.idle() {
+            match rx.recv() {
+                Ok(j) => c.push(j),
+                Err(_) => return,
+            }
+        }
         while let Ok(j) = rx.try_recv() {
-            job = j;
+            c.push(j);
         }
-        if user != Some(job.key.user) {
-            cache.clear();
-            user = Some(job.key.user);
-        }
-        let mut ranges = vec![];
-        for (id, pi, p) in &job.paras {
-            let k = (serde_json::to_string(&p.runs).unwrap_or_default(), job.key.user);
-            let k = (format!("{}\u{0}{}", job.default_lang, k.0), k.1);
-            let r = cache
-                .entry(k)
-                .or_insert_with(|| deckcraft_engine::spell::misspelt(p, &job.default_lang, &[]).into_iter().map(|w| (w.start, w.end)).collect());
-            ranges.extend(r.iter().map(|(a, b)| (*id, *pi, *a, *b)));
-        }
-        if cache.len() > 20_000 {
-            cache.clear();
-        }
-        if tx.send(Done { key: job.key, ranges }).is_err() {
-            return;
-        }
-        if let Some(c) = &job.repaint {
-            c.request_repaint();
+        // In slices, so a newer job can replace one being checked.
+        for (d, repaint) in c.step(20.0) {
+            if tx.send(d).is_err() {
+                return;
+            }
+            if let Some(r) = repaint {
+                r.request_repaint();
+            }
         }
     }
 }
@@ -111,22 +175,103 @@ fn default_lang(st: &DocState) -> String {
     "en-US".into()
 }
 
+/// A word under a squiggle: `(tag, start, end)`.
+type Mark = (Tag, usize, usize);
+
+#[derive(Default)]
+pub struct Squiggles {
+    tx: Option<Sender<Job>>,
+    rx: Option<Receiver<Done>>,
+    /// No worker thread (the web build, or forced for tests): check on the UI thread.
+    inline: Option<Checker>,
+    /// Check on the UI thread even where threads exist (tests of the web path).
+    pub force_inline: bool,
+    pending: [Option<Key>; 2],
+    done: [Option<Done>; 2],
+    /// Underlines in slide coordinates for the slide's `done`, and the key they were laid out for.
+    lines: Vec<(Mark, Point, Point)>,
+    lines_for: Option<Key>,
+    /// Off (tests or the setting).
+    pub disabled: bool,
+    /// The misspelt word a context menu is open on.
+    pub menu_word: Option<MenuWord>,
+    /// Words skipped with Ignore All this session (lower-case).
+    ignored: Vec<String>,
+}
+
+/// A misspelt word under the pointer, with corrections.
+#[derive(Clone, Debug)]
+pub struct MenuWord {
+    pub tag: Tag,
+    pub start: usize,
+    pub word: String,
+    pub suggestions: Vec<String>,
+}
+
+fn slot(k: Kind) -> usize {
+    match k {
+        Kind::Slide => 0,
+        Kind::Notes => 1,
+    }
+}
+
 impl Squiggles {
     fn start(&mut self) -> bool {
-        if self.tx.is_some() {
+        if self.tx.is_some() || self.inline.is_some() {
             return true;
         }
-        if cfg!(target_arch = "wasm32") {
-            return false;
+        if !cfg!(target_arch = "wasm32") && !self.force_inline {
+            let (jtx, jrx) = channel();
+            let (dtx, drx) = channel();
+            if std::thread::Builder::new().name("spelling".into()).spawn(move || worker(jrx, dtx)).is_ok() {
+                self.tx = Some(jtx);
+                self.rx = Some(drx);
+                return true;
+            }
         }
-        let (jtx, jrx) = channel();
-        let (dtx, drx) = channel();
-        let ok = std::thread::Builder::new().name("spelling".into()).spawn(move || worker(jrx, dtx)).is_ok();
-        if ok {
-            self.tx = Some(jtx);
-            self.rx = Some(drx);
+        self.inline = Some(Checker::default());
+        true
+    }
+
+    /// Take in finished checks (and, on the UI thread, spend this frame's budget).
+    fn receive(&mut self, budget_ms: f64) {
+        let mut got = vec![];
+        if let Some(rx) = &self.rx {
+            while let Ok(d) = rx.try_recv() {
+                got.push(d);
+            }
         }
-        ok
+        if let Some(c) = self.inline.as_mut() {
+            got.extend(c.step(budget_ms).into_iter().map(|(d, _)| d));
+        }
+        for d in got {
+            let i = slot(d.kind);
+            if self.pending[i] == Some(d.key) {
+                self.pending[i] = None;
+            }
+            self.done[i] = Some(d);
+        }
+    }
+
+    fn ask(&mut self, kind: Kind, key: Key, default_lang: String, paras: impl FnOnce() -> Vec<(Tag, Paragraph)>, repaint: Option<&egui::Context>) {
+        let i = slot(kind);
+        if self.done[i].as_ref().is_some_and(|d| d.key == key) || self.pending[i] == Some(key) {
+            return;
+        }
+        let job = Job { kind, key, default_lang, paras: paras(), repaint: repaint.cloned() };
+        if let Some(c) = self.inline.as_mut() {
+            c.push(job);
+            self.pending[i] = Some(key);
+            if let Some(r) = repaint {
+                r.request_repaint();
+            }
+        } else if self.tx.as_ref().is_some_and(|tx| tx.send(job).is_ok()) {
+            self.pending[i] = Some(key);
+        }
+    }
+
+    fn is_ignored(&self, word: &str) -> bool {
+        !self.ignored.is_empty() && self.ignored.contains(&word.to_lowercase())
     }
 
     /// Ask for a check of the current slide if it changed, take in finished checks, and return the
@@ -135,69 +280,101 @@ impl Squiggles {
         if self.disabled || !self.start() {
             return vec![];
         }
+        self.receive(FRAME_BUDGET_MS);
         let key =
-            Key { doc: Arc::as_ptr(&st.doc) as usize, rev: st.revision, slide: st.selection.slide, user: deckcraft_engine::spell::user_generation() };
-        if let Some(rx) = &self.rx {
-            while let Ok(d) = rx.try_recv() {
-                if self.pending == Some(d.key) {
-                    self.pending = None;
-                }
-                self.lines.clear();
-                self.done = Some(d);
-                if let Some(d) = &self.done
-                    && d.key == key
-                {
-                    let mut by_shape: HashMap<ShapeId, Vec<(usize, usize, usize)>> = HashMap::new();
-                    for (id, p, a, b) in &d.ranges {
-                        by_shape.entry(*id).or_default().push((*p, *a, *b));
-                    }
-                    for (id, rs) in by_shape {
-                        for r in rs {
-                            for (a, b) in deckcraft_engine::cmd::text::range_underlines(st, id, &[r]) {
-                                self.lines.push(((id, r.0, r.1, r.2), a, b));
-                            }
-                        }
-                    }
-                }
-            }
-        }
-        let fresh = self.done.as_ref().is_some_and(|d| d.key == key);
-        if !fresh && self.pending != Some(key) {
+            Key { of: hash_of(&(Arc::as_ptr(&st.doc) as usize, st.revision, st.selection.slide)), user: deckcraft_engine::spell::user_generation() };
+        let paras = || {
             let mut paras = vec![];
             if let Some(sl) = st.doc.slides.get(st.selection.slide) {
                 deckcraft_model::walk(&sl.shapes, &mut |sh, _| {
                     if let Some(t) = &sh.text {
                         for (i, p) in t.paragraphs.iter().enumerate() {
-                            paras.push((sh.id, i, p.clone()));
+                            paras.push((Tag::Shape { id: sh.id, para: i }, p.clone()));
+                        }
+                    }
+                    if let deckcraft_model::ShapeKind::Table(tb) = &sh.kind {
+                        for (r, row) in tb.rows.iter().enumerate() {
+                            for (c, cell) in row.cells.iter().enumerate() {
+                                if cell.is_covered() {
+                                    continue;
+                                }
+                                for (i, p) in cell.text.paragraphs.iter().enumerate() {
+                                    paras.push((Tag::Cell { id: sh.id, row: r, col: c, para: i }, p.clone()));
+                                }
+                            }
                         }
                     }
                 });
             }
-            let job = Job { key, default_lang: default_lang(st), paras, repaint: repaint.cloned() };
-            if self.tx.as_ref().is_some_and(|tx| tx.send(job).is_ok()) {
-                self.pending = Some(key);
+            paras
+        };
+        self.ask(Kind::Slide, key, default_lang(st), paras, repaint);
+        let Some(d) = self.done[0].as_ref().filter(|d| d.key == key) else { return vec![] };
+        if self.lines_for != Some(key) {
+            self.lines.clear();
+            for &(tag, a, b) in &d.ranges {
+                let under = match tag {
+                    Tag::Shape { id, para } => deckcraft_engine::cmd::text::range_underlines(st, id, &[(para, a, b)]),
+                    Tag::Cell { id, row, col, para } => deckcraft_engine::cmd::text::cell_range_underlines(st, id, row, col, &[(para, a, b)]),
+                    Tag::Notes { .. } => vec![],
+                };
+                self.lines.extend(under.into_iter().map(|(p, q)| ((tag, a, b), p, q)));
             }
-        }
-        if !fresh {
-            return vec![];
+            self.lines_for = Some(key);
         }
         // Not under the word the caret is in.
-        let typing = st.selection.text.as_ref().filter(|t| !t.notes && t.cell.is_none()).map(|t| (t.shape, t.caret));
+        let typing = st.selection.text.as_ref().filter(|t| !t.notes).map(|t| (t.shape, t.cell, t.caret));
+        let under_caret = |tag: &Tag, a: usize, b: usize| {
+            typing.is_some_and(|(s, cell, (cp, cc))| {
+                let here = match *tag {
+                    Tag::Shape { id, para } => cell.is_none() && id == s && para == cp,
+                    Tag::Cell { id, row, col, para } => cell == Some((row, col)) && id == s && para == cp,
+                    Tag::Notes { .. } => false,
+                };
+                here && cc >= a && cc <= b
+            })
+        };
         self.lines
             .iter()
-            .filter(|((id, p, a, b), _, _)| !typing.is_some_and(|(s, (cp, cc))| s == *id && cp == *p && cc >= *a && cc <= *b))
-            .filter(|((id, p, a, b), _, _)| {
-                self.ignored.is_empty() || {
-                    let w = st
-                        .shape(*id)
-                        .and_then(|sh| sh.text.as_ref()?.paragraphs.get(*p).map(|pp| pp.text().chars().skip(*a).take(b - a).collect::<String>()));
-                    !w.is_some_and(|w| self.ignored.contains(&w.to_lowercase()))
-                }
-            })
+            .filter(|((tag, a, b), _, _)| !under_caret(tag, *a, *b))
+            .filter(|((tag, a, b), _, _)| self.ignored.is_empty() || !word_of(st, *tag, *a, *b).is_some_and(|w| self.is_ignored(&w)))
             .map(|(_, a, b)| (*a, *b))
             .collect()
     }
 
+    /// The misspelt character ranges of the notes text being shown (`caret` is the cursor's
+    /// character index, whose word isn't marked); empty until the check is in.
+    pub fn notes(&mut self, text: &str, lang: &str, caret: Option<usize>, repaint: Option<&egui::Context>) -> Vec<(usize, usize)> {
+        if self.disabled || !self.start() {
+            return vec![];
+        }
+        self.receive(FRAME_BUDGET_MS);
+        let key = Key { of: hash_of(&(text, lang)), user: deckcraft_engine::spell::user_generation() };
+        let paras = || {
+            let mut out = vec![];
+            let mut start = 0;
+            for line in text.split('\n') {
+                out.push((Tag::Notes { start }, Paragraph::new(line)));
+                start += line.chars().count() + 1;
+            }
+            out
+        };
+        self.ask(Kind::Notes, key, lang.to_string(), paras, repaint);
+        let Some(d) = self.done[1].as_ref().filter(|d| d.key == key) else { return vec![] };
+        let chars: Vec<char> = text.chars().collect();
+        d.ranges
+            .iter()
+            .filter_map(|&(tag, a, b)| match tag {
+                Tag::Notes { start } => Some((start + a, start + b)),
+                _ => None,
+            })
+            .filter(|(a, b)| !caret.is_some_and(|c| c >= *a && c <= *b))
+            .filter(|(a, b)| {
+                self.ignored.is_empty() || !self.is_ignored(&chars.get(*a..*b).map(|c| c.iter().collect::<String>()).unwrap_or_default())
+            })
+            .collect()
+    }
+
     /// Skip `word` everywhere for the rest of the session.
     pub fn ignore(&mut self, word: &str) {
         self.ignored.push(word.to_lowercase());
@@ -205,37 +382,57 @@ impl Squiggles {
 
     /// The squiggled word at slide point `p` (within `tol` points of its underline).
     pub fn word_at(&self, st: &DocState, p: Point, tol: f64) -> Option<MenuWord> {
-        let ((shape, para, start, end), _, _) = *self.lines.iter().find(|(_, a, b)| {
+        let ((tag, start, end), _, _) = *self.lines.iter().find(|(_, a, b)| {
             let (x0, x1) = (a.x.min(b.x), a.x.max(b.x));
             // From the line's top (a word is about a line high above its underline) to just below it.
             p.x >= x0 - tol && p.x <= x1 + tol && p.y <= a.y.max(b.y) + tol && p.y >= a.y.min(b.y) - 24.0
         })?;
-        let pp = st
-            .doc
-            .slides
-            .get(st.selection.slide)
-            .and_then(|sl| deckcraft_model::find_shape(&sl.shapes, shape))?
-            .text
-            .as_ref()?
-            .paragraphs
-            .get(para)?;
+        let pp = paragraph_of(st, tag)?;
         let word: String = pp.text().chars().skip(start).take(end - start).collect();
-        let lang = deckcraft_engine::spell::paragraph_words(pp, &default_lang(st)).into_iter().find(|w| w.start == start).map(|w| w.lang)?;
+        let lang = deckcraft_engine::spell::paragraph_words(&pp, &default_lang(st)).into_iter().find(|w| w.start == start).map(|w| w.lang)?;
         let suggestions = deckcraft_engine::spell::dictionary(&lang).map(|d| d.suggest(&word, 5)).unwrap_or_default();
-        Some(MenuWord { shape, para, start, word, suggestions })
+        Some(MenuWord { tag, start, word, suggestions })
     }
 
-    /// Wait (tests) until the check for the current state is in.
+    /// Wait (tests) until the slide's check for `st` is in.
     pub fn settle(&mut self, st: &DocState) -> Vec<(Point, Point)> {
-        for _ in 0..500 {
+        for _ in 0..2000 {
             let v = self.update(st, None);
-            if self.done.as_ref().is_some_and(|d| self.pending.is_none() && d.key.doc == Arc::as_ptr(&st.doc) as usize) {
+            if self.pending[0].is_none() && self.done[0].is_some() {
                 return v;
             }
-            std::thread::sleep(std::time::Duration::from_millis(2));
+            std::thread::sleep(std::time::Duration::from_millis(1));
         }
         vec![]
     }
+
+    /// Wait (tests) until the notes check for `text` is in.
+    pub fn settle_notes(&mut self, text: &str, lang: &str) -> Vec<(usize, usize)> {
+        for _ in 0..2000 {
+            let v = self.notes(text, lang, None, None);
+            if self.pending[1].is_none() && self.done[1].is_some() {
+                return v;
+            }
+            std::thread::sleep(std::time::Duration::from_millis(1));
+        }
+        vec![]
+    }
+}
+
+fn paragraph_of(st: &DocState, tag: Tag) -> Option<Paragraph> {
+    let sl = st.doc.slides.get(st.selection.slide)?;
+    match tag {
+        Tag::Shape { id, para } => deckcraft_model::find_shape(&sl.shapes, id)?.text.as_ref()?.paragraphs.get(para).cloned(),
+        Tag::Cell { id, row, col, para } => match &deckcraft_model::find_shape(&sl.shapes, id)?.kind {
+            deckcraft_model::ShapeKind::Table(tb) => tb.cell(row, col)?.text.paragraphs.get(para).cloned(),
+            _ => None,
+        },
+        Tag::Notes { .. } => None,
+    }
+}
+
+fn word_of(st: &DocState, tag: Tag, a: usize, b: usize) -> Option<String> {
+    Some(paragraph_of(st, tag)?.text().chars().skip(a).take(b - a).collect())
 }
 
 /// A red wavy line from `a` to `b` (screen points).
diff --git a/crates/ui-egui/src/status.rs b/crates/ui-egui/src/status.rs
index 8e915b71..65ec8bc9 100644
--- a/crates/ui-egui/src/status.rs
+++ b/crates/ui-egui/src/status.rs
@@ -109,6 +109,11 @@ fn labeled(ui: &mut Ui, icon: Icon, label: &str, on: bool) -> egui::Response {
 }
 
 /// The speaker notes editor under the slide.
+/// The language of a slide's notes: the first notes run that has one.
+fn notes_lang(s: &deckcraft_model::Slide) -> Option<String> {
+    s.notes.paragraphs.iter().flat_map(|p| &p.runs).find_map(|r| r.props.lang.clone())
+}
+
 pub fn notes_pane(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
     let Some(st) = app.session.active() else { return };
@@ -145,15 +150,27 @@ pub fn notes_pane(app: &mut SlideApp, ui: &mut Ui) {
                 app.notes_buf.2 = current.clone();
             }
             let mut buf = app.notes_buf.2.clone();
-            let r = ui.add(
-                egui::TextEdit::multiline(&mut buf)
-                    .id(id)
-                    .hint_text("Click to add notes")
-                    .frame(egui::Frame::NONE)
-                    .desired_width(f32::INFINITY)
-                    .desired_rows(2)
-                    .font(theme::font(13.0)),
-            );
+            let out = egui::TextEdit::multiline(&mut buf)
+                .id(id)
+                .hint_text("Click to add notes")
+                .frame(egui::Frame::NONE)
+                .desired_width(f32::INFINITY)
+                .desired_rows(2)
+                .font(theme::font(13.0))
+                .show(ui);
+            let r = out.response.clone();
+            // Spelling squiggles under misspelt words of the notes.
+            let lang = app.session.active().and_then(|d| d.doc.slides.get(idx)).and_then(|s| notes_lang(s)).unwrap_or_else(|| "en-US".into());
+            let caret = out.cursor_range.map(|c| c.primary.index.0);
+            for (a, b) in app.squiggles.notes(&buf, &lang, caret, Some(ui.ctx())) {
+                let (ra, rb) = (out.galley.pos_from_cursor(egui::text::CCursor::new(a)), out.galley.pos_from_cursor(egui::text::CCursor::new(b)));
+                // One underline per row the word is on (a word doesn't wrap, so normally one).
+                if (ra.bottom() - rb.bottom()).abs() < 1.0 {
+                    let y = ra.bottom() - 1.0;
+                    let o = out.galley_pos.to_vec2();
+                    crate::squiggles::paint(ui.painter(), egui::pos2(ra.left(), y) + o, egui::pos2(rb.left(), y) + o, 1.0);
+                }
+            }
             app.notes_buf.2 = buf.clone();
             if r.lost_focus() && buf != current {
                 let _ = app.run("slide.notes", json!({"text": buf, "index": idx}));
diff --git a/docs/gaps.md b/docs/gaps.md
index 3cc546cd..8363d892 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -179,11 +179,12 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
   (`crates/engine/src/spell.rs`: affixes, cross products, one level of continuation, compounds,
   case rules, suggestions), each run in its own language (`lang` from PPTX), with a user dictionary
   for Add to Dictionary. Red squiggles on the current slide come from a worker thread, with a
-  context menu to correct, ignore or add. None ship with DeckCraft, so without one installed (always
-  on Windows and the web) only a short list of common misspellings is found, and the web build has
-  no squiggles. Notes and table cells aren't squiggled.
+  context menu to correct, ignore or add; table cells and speaker notes are squiggled too (the
+  notes have no context menu yet), and the web build checks on the UI thread a few milliseconds per
+  frame. None ship with DeckCraft, so without one installed (always on Windows and the web) only a
+  short list of common misspellings is found.
   Thesaurus (#549) and AutoCorrect (#521) have open PRs.
-- **Estimate:** 2–4 h (bundle openly licensed dictionaries; squiggles in notes and table cells).
+- **Estimate:** 1–3 h (bundle openly licensed dictionaries; a notes context menu).
 
 ### Equations
 - **Evidence:** checklist row missing; PR #55 (OMML editor, +10.5k lines) is open.
@@ -262,6 +263,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Spelling squiggles in table cells and notes, and on the web |
 | 2026-10-14 | minor | Spelling squiggles while typing, Add to Dictionary, per-run languages and compounds |
 | 2026-10-14 | minor | Spelling checks with installed Hunspell dictionaries and suggests corrections |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |

From 33252f28dbd8554b29962251a56fa903c0157e10 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:34:55 +0300
Subject: [PATCH 237/376] SmartArt: Convert to SmartArt gallery on Home,
 Convert to Text keeps the text size

Home > Paragraph gets a Convert to SmartArt button whose menu lists every layout by category (List, Process, Cycle, Hierarchy, Relationship, Matrix, Pyramid, Picture); a click converts the selected text. Convert to Text sets the text box's titles and bullets to the sizes the graphic showed them at. Icon toggles carry their tooltip as their accessible name.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/smartart.rs    | 62 ++++++++++++++++++++++++++++
 crates/engine/src/tests.rs           |  2 +
 crates/ui-egui/src/ribbon.rs         | 37 +++++++++++++++++
 crates/ui-egui/src/smartart_tests.rs | 24 +++++++++++
 crates/ui-egui/src/widgets.rs        |  2 +
 5 files changed, 127 insertions(+)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index 70e0fa9a..66b8dda4 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -103,6 +103,29 @@ pub const COLORS: [(&str, &str); 17] = [
     ("accent6Grad", "Gradient Range - Accent 6"),
 ];
 
+/// The gallery category a layout is shown under in Convert to SmartArt and Change Layout.
+pub fn category(kind: &str) -> &'static str {
+    match kind {
+        "pictureList" | "pictureCaption" | "pictureProcess" | "pictureHList" => "picture",
+        "process"
+        | "chevron"
+        | "verticalProcess"
+        | "stepUp"
+        | "timeline"
+        | "gear"
+        | "funnel"
+        | "accentProcess"
+        | "continuousBlockProcess"
+        | "bendingProcess" => "process",
+        "cycle" | "blockCycle" | "textCycle" | "continuousCycle" | "segmentedCycle" | "multidirectionalCycle" | "pie" => "cycle",
+        "hierarchy" | "horizontalHierarchy" | "orgChart" | "halfCircleOrgChart" | "nameTitleOrgChart" => "hierarchy",
+        "radial" | "venn" | "target" | "linearVenn" | "stackedVenn" | "nestedTarget" => "relationship",
+        "matrix" | "titledMatrix" | "gridMatrix" | "cycleMatrix" => "matrix",
+        "pyramid" | "invertedPyramid" | "segmentedPyramid" => "pyramid",
+        _ => "list",
+    }
+}
+
 pub fn is_kind(k: &str) -> bool {
     LAYOUTS.iter().any(|(id, _)| *id == k)
 }
@@ -1833,6 +1856,13 @@ fn to_text(s: &mut Session, p: &Value) -> Result<Value> {
     const CMD: &str = "smartArt.toText";
     let gid = target_group(s, p, CMD)?;
     let (_, d) = selected_for(s, gid).ok_or_else(|| bad(CMD, "select a SmartArt graphic"))?;
+    // The sizes the graphic's text shows at: its titles' and its bullets' (shrunk to fit included).
+    let (title_pt, bullet_pt) = {
+        let st = s.doc()?;
+        let shapes = current_shapes(&st.doc, &st.selection).ok_or_else(|| bad(CMD, "no slide"))?;
+        let g = diagram_group(shapes, gid).ok_or_else(|| bad(CMD, "select a SmartArt graphic"))?;
+        text_sizes(g.children())
+    };
     let new = s.edit(|doc, sel| {
         let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad(CMD, "no slide"))?;
         let at = shapes.iter().position(|x| x.id == gid).ok_or_else(|| bad(CMD, "the graphic isn't at the top of the slide"))?;
@@ -1841,6 +1871,11 @@ fn to_text(s: &mut Session, p: &Value) -> Result<Value> {
         for n in &d.nodes {
             let mut para = Paragraph::new(&n.text);
             para.level = n.level.min(MAX_LEVEL);
+            let size = if n.level == 0 { title_pt } else { bullet_pt };
+            for r in &mut para.runs {
+                r.props.size = Some(size);
+            }
+            para.end_props.size = Some(size);
             para.props.bullet = Some(deckcraft_model::text::Bullet::Char { char: "•".into() });
             para.props.margin_left = Some(18.0 * (para.level as f64 + 1.0));
             para.props.indent = Some(-14.0);
@@ -1878,6 +1913,33 @@ fn to_shapes(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(Value::Null)
 }
 
+/// The most common title and bullet font sizes in a diagram's shapes (20 and 14 pt when none).
+fn text_sizes(children: &[Shape]) -> (f64, f64) {
+    let mut titles: Vec<f64> = vec![];
+    let mut bullets: Vec<f64> = vec![];
+    for c in children {
+        let Some(b) = &c.text else { continue };
+        for p in &b.paragraphs {
+            let Some(sz) = p.runs.iter().find_map(|r| r.props.size) else { continue };
+            if p.props.bullet.is_some() { bullets.push(sz) } else { titles.push(sz) }
+        }
+    }
+    let mode = |v: &mut Vec<f64>, d: f64| {
+        v.sort_by(|a, b| a.total_cmp(b));
+        let mut best = (d, 0usize);
+        let mut k = 0;
+        while k < v.len() {
+            let j = v[k..].iter().take_while(|x| (**x - v[k]).abs() < 1e-9).count();
+            if j > best.1 {
+                best = (v[k], j);
+            }
+            k += j;
+        }
+        best.0
+    };
+    (mode(&mut titles, 20.0), mode(&mut bullets, 14.0))
+}
+
 /// The graphic `gid` with its outline (typed text synced).
 fn selected_for(s: &Session, gid: ShapeId) -> Option<(ShapeId, Diagram)> {
     let st = s.doc().ok()?;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index ac033837..327294c4 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -1000,6 +1000,8 @@ fn smartart_converts_to_and_from_text_and_shapes() {
     let tb = st.doc.slides[1].shapes.iter().find(|x| x.id.0 as u64 == tid).unwrap();
     assert!(tb.diagram.is_none());
     assert_eq!(tb.text.as_ref().unwrap().paragraphs.len(), 3);
+    // The text keeps the size it had in the graphic.
+    assert!(tb.text.as_ref().unwrap().paragraphs.iter().all(|p| p.runs.iter().all(|r| r.props.size.is_some_and(|z| z > 10.0))));
 
     s.execute("edit.undo", &json!({})).unwrap();
     s.execute("smartArt.toShapes", &json!({"id": gid})).unwrap();
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 2d47d62b..0b8c4e6f 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -539,6 +539,41 @@ pub fn cref_param(c: &deckcraft_model::ColorRef) -> Value {
     }
 }
 
+/// Convert to SmartArt: the layouts by category, three to a row; a click converts the selected
+/// text.
+fn smartart_gallery(app: &mut SlideApp, ui: &mut Ui) {
+    use deckcraft_engine::cmd::smartart::{LAYOUTS, category};
+    ui.set_min_width(420.0);
+    for (cat, title) in [
+        ("list", "List"),
+        ("process", "Process"),
+        ("cycle", "Cycle"),
+        ("hierarchy", "Hierarchy"),
+        ("relationship", "Relationship"),
+        ("matrix", "Matrix"),
+        ("pyramid", "Pyramid"),
+        ("picture", "Picture"),
+    ] {
+        let kinds: Vec<(&str, &str)> = LAYOUTS.iter().copied().filter(|(k, _)| category(k) == cat).collect();
+        if kinds.is_empty() {
+            continue;
+        }
+        ui.label(egui::RichText::new(title).strong());
+        egui::Grid::new(("smartart_gallery", cat)).num_columns(3).spacing([6.0, 2.0]).show(ui, |ui| {
+            for (i, (k, label)) in kinds.iter().enumerate() {
+                if ui.add_sized([136.0, 22.0], egui::Button::new(*label)).clicked() {
+                    run(app, "smartArt.fromText", json!({"kind": k}));
+                    ui.close();
+                }
+                if i % 3 == 2 {
+                    ui.end_row();
+                }
+            }
+        });
+        ui.separator();
+    }
+}
+
 fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
     let en = enabled(app, "format.bullets");
     group(ui, |ui| {
@@ -637,6 +672,8 @@ fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                         }
                     }
                 });
+                let r = icon_toggle(ui, Icon::SmartArt, "Convert to SmartArt", enabled(app, "smartArt.fromText"), false);
+                egui::Popup::menu(&r).show(|ui| smartart_gallery(app, ui));
             });
         });
     });
diff --git a/crates/ui-egui/src/smartart_tests.rs b/crates/ui-egui/src/smartart_tests.rs
index 7692f704..9d88e465 100644
--- a/crates/ui-egui/src/smartart_tests.rs
+++ b/crates/ui-egui/src/smartart_tests.rs
@@ -51,3 +51,27 @@ fn text_pane_types_adds_and_demotes() {
     h.run_steps(4);
     assert_eq!(levels(&h), [("Plan".into(), 0), ("Build it".into(), 0), ("Test".into(), 1)]);
 }
+
+#[test]
+fn home_convert_to_smartart_gallery_converts_the_text() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.textBox", &json!({"text": "Goals\nRevenue\nGrowth"})).unwrap();
+    let app = SlideApp::new(s, Services::default());
+    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.get_by_label("Convert to SmartArt").click();
+    h.run_steps(3);
+    h.get_by_label("Basic Block List").click();
+    h.run_steps(3);
+    let st = h.state().session.active().unwrap();
+    let (_, d) = deckcraft_engine::cmd::smartart::selected(st).expect("the text became a SmartArt graphic");
+    assert_eq!(d.kind, "blockList");
+    assert_eq!(d.nodes.len(), 3);
+}
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 5827b396..1f26fea1 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -155,6 +155,8 @@ pub fn icon_toggle(ui: &mut Ui, icon: Icon, tip: &str, enabled: bool, on: bool)
         painter.rect_filled(rect, CornerRadius::same(4), c);
     }
     icons::paint(&painter, rect.shrink(3.0), icon, t.text, !enabled);
+    // Named for screen readers (and tests) by its tooltip.
+    resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, tip));
     resp.on_hover_text(tip)
 }
 

From 68ab3a4839e01e77caf96a39a7f8e21fd24f6f95 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:41:28 +0300
Subject: [PATCH 238/376] UI: Font dialog sets character formatting in one step
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

format.fontDialog applies family, size, bold, italic, underline, colour,
strikethrough, baseline, caps and spacing together, so one undo restores
them. With no fields it asks the UI to open the dialog, seeded from the
selection. Home › Font, the shape menu and Cmd+T open it.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                              |   4 +-
 crates/engine/src/cmd/format.rs         | 337 ++++++++++++++++++++++++
 crates/ui-egui/src/canvas.rs            |   4 +
 crates/ui-egui/src/dialogs.rs           | 212 ++++++++++++++-
 crates/ui-egui/src/font_dialog_tests.rs |  65 +++++
 crates/ui-egui/src/menus.rs             |   1 +
 crates/ui-egui/src/ribbon.rs            |   3 +
 docs/architecture.md                    |   7 +-
 docs/gaps.md                            |   8 +-
 docs/target-app-parity.md               |   5 +-
 docs/ui-parity.md                       |  11 +-
 11 files changed, 642 insertions(+), 15 deletions(-)
 create mode 100644 crates/ui-egui/src/font_dialog_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..15729ba9 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Font dialog; previous: minor, hours to ~95% per audience added; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Font dialog (Home › Font, the shape menu, Cmd+T): family, size, bold, italic, underline, colour, strikethrough, baseline, caps and character spacing, applied in one undo step. Breadth stays 79% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Font dialog |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index c68d1242..f1c3921d 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -69,6 +69,15 @@ pub fn specs() -> Vec<CommandSpec> {
             spacing
         ),
         cmd!("format.clear", "Clear All Formatting", ["Home", "Font"], Some("Cmd+Space"), "{}", has_text_or_shapes, clear),
+        cmd!(
+            "format.fontDialog",
+            "Font…",
+            ["Home", "Font"],
+            Some("Cmd+T"),
+            "{family?, size?: pt, bold?: bool, italic?: bool, underline?: none|sng|dbl|heavy|dotted|dash|wavy, color?, strike?: none|sng|dbl, baseline?: none|super|sub|<fraction>, caps?: none|small|all, spacing?: pt} — with none of these, opens the Font dialog",
+            has_text_or_shapes,
+            font_dialog
+        ),
         cmd!("format.textShadow", "Text Shadow", ["Home", "Font"], None, "{on?: bool}", has_text_or_shapes, text_shadow),
         cmd!(
             "format.textOutline",
@@ -309,6 +318,213 @@ fn spacing(s: &mut Session, p: &Value) -> Result<Value> {
     let v = f64_param(p, "pt").unwrap_or(0.0).clamp(-100.0, 400.0);
     format_run(s, &move |r| r.spacing = Some(v))
 }
+
+/// Character formatting applied together, so the Font dialog is one undo step.
+struct FontEdits {
+    family: Option<String>,
+    size: Option<f64>,
+    bold: Option<bool>,
+    italic: Option<bool>,
+    underline: Option<String>,
+    color: Option<deckcraft_model::ColorRef>,
+    strike: Option<Strike>,
+    baseline: Option<f64>,
+    caps: Option<Caps>,
+    spacing: Option<f64>,
+}
+
+impl FontEdits {
+    fn is_empty(&self) -> bool {
+        self.family.is_none()
+            && self.size.is_none()
+            && self.bold.is_none()
+            && self.italic.is_none()
+            && self.underline.is_none()
+            && self.color.is_none()
+            && self.strike.is_none()
+            && self.baseline.is_none()
+            && self.caps.is_none()
+            && self.spacing.is_none()
+    }
+
+    fn write(&self, r: &mut RunProps) {
+        if let Some(f) = &self.family {
+            r.font = Some(f.clone());
+        }
+        if let Some(v) = self.size {
+            r.size = Some(v);
+        }
+        if let Some(v) = self.bold {
+            r.bold = Some(v);
+        }
+        if let Some(v) = self.italic {
+            r.italic = Some(v);
+        }
+        if let Some(u) = &self.underline {
+            r.underline = Some(u.clone());
+        }
+        if let Some(c) = &self.color {
+            r.fill = Some(Fill::solid(c.clone()));
+        }
+        if let Some(v) = self.strike {
+            r.strike = Some(v);
+        }
+        if let Some(v) = self.baseline {
+            r.baseline = Some(v);
+        }
+        if let Some(v) = self.caps {
+            r.caps = Some(v);
+        }
+        if let Some(v) = self.spacing {
+            r.spacing = Some(v);
+        }
+    }
+}
+
+fn font_bool(p: &Value, key: &str) -> Result<Option<bool>> {
+    match p.get(key) {
+        None => Ok(None),
+        Some(Value::Bool(b)) => Ok(Some(*b)),
+        Some(_) => Err(bad("format.fontDialog", format!("`{key}` must be a bool"))),
+    }
+}
+
+fn font_str<'a>(p: &'a Value, key: &str) -> Result<Option<&'a str>> {
+    match p.get(key) {
+        None => Ok(None),
+        Some(Value::String(s)) => Ok(Some(s)),
+        Some(_) => Err(bad("format.fontDialog", format!("`{key}` must be a string"))),
+    }
+}
+
+fn font_edits(p: &Value) -> Result<FontEdits> {
+    let family = match font_str(p, "family")? {
+        None => None,
+        Some(s) => {
+            let t = s.trim();
+            if t.is_empty() || t.chars().count() > 200 {
+                return Err(bad("format.fontDialog", "`family` must be 1–200 characters"));
+            }
+            Some(t.to_string())
+        }
+    };
+    let size = match p.get("size") {
+        None => None,
+        Some(v) => {
+            let n = v.as_f64().filter(|n| n.is_finite()).ok_or_else(|| bad("format.fontDialog", "`size` must be a finite number"))?;
+            Some(n.clamp(1.0, 4000.0))
+        }
+    };
+    let underline = match font_str(p, "underline")? {
+        None => None,
+        Some(s) => {
+            if !matches!(s, "none" | "sng" | "dbl" | "heavy" | "dotted" | "dash" | "wavy") {
+                return Err(bad("format.fontDialog", "`underline` must be none, sng, dbl, heavy, dotted, dash or wavy"));
+            }
+            Some(s.to_string())
+        }
+    };
+    let color =
+        if p.get("color").is_some() { Some(color_param(p, "color").ok_or_else(|| bad("format.fontDialog", "invalid `color`"))?) } else { None };
+    let strike = match font_str(p, "strike")? {
+        None => None,
+        Some("none") => Some(Strike::None),
+        Some("sng" | "single") => Some(Strike::Single),
+        Some("dbl" | "double") => Some(Strike::Double),
+        Some(_) => return Err(bad("format.fontDialog", "`strike` must be none, sng or dbl")),
+    };
+    let baseline = match p.get("baseline") {
+        None => None,
+        Some(Value::String(s)) => match s.as_str() {
+            "none" => Some(0.0),
+            "super" | "superscript" => Some(0.3),
+            "sub" | "subscript" => Some(-0.25),
+            _ => return Err(bad("format.fontDialog", "`baseline` must be none, super, sub or a fraction")),
+        },
+        Some(Value::Number(n)) => {
+            let f = n.as_f64().filter(|v| v.is_finite()).ok_or_else(|| bad("format.fontDialog", "`baseline` must be finite"))?;
+            Some(f.clamp(-1.0, 1.0))
+        }
+        Some(_) => return Err(bad("format.fontDialog", "`baseline` must be none, super, sub or a fraction")),
+    };
+    let caps = match font_str(p, "caps")? {
+        None => None,
+        Some("none") => Some(Caps::None),
+        Some("small") => Some(Caps::Small),
+        Some("all") => Some(Caps::All),
+        Some(_) => return Err(bad("format.fontDialog", "`caps` must be none, small or all")),
+    };
+    let spacing = match p.get("spacing") {
+        None => None,
+        Some(v) => {
+            let n = v.as_f64().filter(|n| n.is_finite()).ok_or_else(|| bad("format.fontDialog", "`spacing` must be a finite number"))?;
+            Some(n.clamp(-100.0, 400.0))
+        }
+    };
+    Ok(FontEdits { family, size, bold: font_bool(p, "bold")?, italic: font_bool(p, "italic")?, underline, color, strike, baseline, caps, spacing })
+}
+
+/// A colour as a `format.fontDialog` / `format.color` parameter, including transforms.
+fn color_command_value(c: &deckcraft_model::ColorRef) -> Value {
+    use deckcraft_model::ColorBase;
+    let mut o = serde_json::Map::new();
+    for m in &c.mods {
+        if let Some(v) = m.value() {
+            o.insert(m.xml_name().to_string(), json!(v));
+        }
+    }
+    match &c.base {
+        ColorBase::Rgb { rgb } if o.is_empty() => json!(format!("#{}", rgb.hex())),
+        ColorBase::Rgb { rgb } => {
+            o.insert("rgb".into(), json!(format!("#{}", rgb.hex())));
+            Value::Object(o)
+        }
+        ColorBase::Scheme { slot } => {
+            o.insert("scheme".into(), json!(slot.xml_name()));
+            Value::Object(o)
+        }
+        ColorBase::Preset { name } => json!(name),
+        ColorBase::System { last, .. } => json!(format!("#{}", last.hex())),
+    }
+}
+
+fn font_dialog_params(s: &Session) -> Value {
+    let r = current_run(s);
+    let family = s.doc().ok().and_then(|st| super::text::ctx_for(&st.doc, &st.selection).map(|c| resolve::font_family(&c, &r))).unwrap_or_default();
+    let baseline = r.baseline.unwrap_or(0.0);
+    let mut v = json!({
+        "family": family,
+        "size": r.size.unwrap_or(18.0),
+        "bold": r.bold.unwrap_or(false),
+        "italic": r.italic.unwrap_or(false),
+        "underline": r.underline.as_deref().filter(|u| *u != "none").unwrap_or("none"),
+        "strike": match r.strike {
+            Some(Strike::Double) => "dbl",
+            Some(Strike::Single) => "sng",
+            _ => "none",
+        },
+        "baseline": if baseline > 0.0 { "super" } else if baseline < 0.0 { "sub" } else { "none" },
+        "caps": match r.caps {
+            Some(Caps::Small) => "small",
+            Some(Caps::All) => "all",
+            _ => "none",
+        },
+        "spacing": r.spacing.unwrap_or(0.0),
+    });
+    if let Some(Fill::Solid { color }) = &r.fill {
+        v["color"] = color_command_value(color);
+    }
+    v
+}
+
+fn font_dialog(s: &mut Session, p: &Value) -> Result<Value> {
+    let edits = font_edits(p)?;
+    if edits.is_empty() {
+        s.ui_requests.push(crate::UiRequest::Dialog { id: "font".into(), params: font_dialog_params(s) });
+        return ok();
+    }
+    format_run(s, &|r| edits.write(r))
+}
 fn clear(s: &mut Session, _p: &Value) -> Result<Value> {
     format_run(s, &|r| *r = RunProps { lang: r.lang.clone(), link: r.link.clone(), ..Default::default() })
 }
@@ -682,3 +898,124 @@ fn state(s: &mut Session, _p: &Value) -> Result<Value> {
         "painter": s.painter.is_some(),
     }))
 }
+
+#[cfg(test)]
+mod tests {
+    use deckcraft_model::text::{Caps, Strike};
+    use deckcraft_model::{ColorBase, Fill, SchemeSlot};
+    use serde_json::json;
+
+    use super::*;
+    use crate::{Session, UiRequest};
+
+    fn shape() -> Session {
+        let mut s = Session::with_new();
+        s.execute("shape.insert", &json!({"preset": "rect", "rect": [40.0, 40.0, 240.0, 80.0], "text": "Hello"})).unwrap();
+        s
+    }
+
+    fn props(s: &Session) -> RunProps {
+        s.doc()
+            .unwrap()
+            .selected_shapes()
+            .first()
+            .and_then(|sh| sh.text.as_ref())
+            .and_then(|t| t.paragraphs.first())
+            .and_then(|p| p.runs.first())
+            .unwrap()
+            .props
+            .clone()
+    }
+
+    #[test]
+    fn font_dialog_applies_character_formatting_in_one_undo() {
+        let mut s = shape();
+        let before = s.doc().unwrap().history.undo.len();
+        s.execute(
+            "format.fontDialog",
+            &json!({
+                "family": "Liberation Serif",
+                "size": 28,
+                "bold": true,
+                "italic": false,
+                "underline": "wavy",
+                "color": "#112233",
+                "strike": "dbl",
+                "baseline": "super",
+                "caps": "small",
+                "spacing": 3
+            }),
+        )
+        .unwrap();
+        assert_eq!(s.doc().unwrap().history.undo.len(), before + 1);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Font…");
+        let r = props(&s);
+        assert_eq!(r.font.as_deref(), Some("Liberation Serif"));
+        assert_eq!(r.size, Some(28.0));
+        assert_eq!(r.bold, Some(true));
+        assert_eq!(r.italic, Some(false));
+        assert_eq!(r.underline.as_deref(), Some("wavy"));
+        assert!(matches!(r.fill, Some(Fill::Solid { color }) if matches!(color.base, ColorBase::Rgb { .. })));
+        assert_eq!(r.strike, Some(Strike::Double));
+        assert_eq!(r.baseline, Some(0.3));
+        assert_eq!(r.caps, Some(Caps::Small));
+        assert_eq!(r.spacing, Some(3.0));
+        s.execute("edit.undo", &json!({})).unwrap();
+        let r = props(&s);
+        assert!(r.font.is_none() && r.size.is_none() && r.bold.is_none() && r.underline.is_none() && r.fill.is_none());
+        assert_eq!(r.strike, None);
+        assert_eq!(r.caps, None);
+    }
+
+    #[test]
+    fn font_dialog_changes_only_the_fields_it_is_given() {
+        let mut s = shape();
+        s.execute("format.bold", &json!({"on": true})).unwrap();
+        s.execute("format.fontDialog", &json!({"size": 22, "color": {"scheme": "accent2", "lumMod": 50000}})).unwrap();
+        let r = props(&s);
+        assert_eq!(r.bold, Some(true));
+        assert_eq!(r.size, Some(22.0));
+        assert!(r.font.is_none() && r.italic.is_none());
+        let Some(Fill::Solid { color }) = r.fill else { panic!("solid fill") };
+        assert!(matches!(color.base, ColorBase::Scheme { slot: SchemeSlot::Accent2 }));
+        assert!(color.mods.iter().any(|m| m.xml_name() == "lumMod"));
+        s.execute("edit.undo", &json!({})).unwrap();
+        let r = props(&s);
+        assert_eq!(r.bold, Some(true));
+        assert!(r.size.is_none() && r.fill.is_none());
+    }
+
+    #[test]
+    fn font_dialog_with_no_fields_asks_the_ui_to_open() {
+        let mut s = shape();
+        s.execute("format.italic", &json!({"on": true})).unwrap();
+        let rev = s.doc().unwrap().revision;
+        let n = s.doc().unwrap().history.undo.len();
+        s.ui_requests.clear();
+        s.execute("format.fontDialog", &json!({})).unwrap();
+        assert_eq!(s.doc().unwrap().revision, rev);
+        assert_eq!(s.doc().unwrap().history.undo.len(), n);
+        let Some(UiRequest::Dialog { id, params }) = s.ui_requests.last() else { panic!("dialog request") };
+        assert_eq!(id, "font");
+        assert_eq!(params["italic"], true);
+        assert_eq!(params["bold"], false);
+        assert!(params["family"].as_str().is_some_and(|f| !f.is_empty()));
+        assert!(params["size"].as_f64().is_some_and(|n| n > 0.0));
+    }
+
+    #[test]
+    fn font_dialog_rejects_bad_fields_without_editing() {
+        let mut s = shape();
+        let n = s.doc().unwrap().history.undo.len();
+        let err = s.execute("format.fontDialog", &json!({"underline": "sparkle"})).unwrap_err();
+        assert!(err.to_string().contains("underline"), "{err}");
+        assert!(s.execute("format.fontDialog", &json!({"size": "large"})).is_err());
+        assert!(s.execute("format.fontDialog", &json!({"bold": 1})).is_err());
+        assert!(s.execute("format.fontDialog", &json!({"family": "  "})).is_err());
+        assert!(s.execute("format.fontDialog", &json!({"color": "not-a-color"})).is_err());
+        assert_eq!(s.doc().unwrap().history.undo.len(), n);
+        assert!(props(&s).underline.is_none());
+        s.execute("edit.deselect", &json!({})).unwrap();
+        assert!(s.execute("format.fontDialog", &json!({"bold": true})).is_err());
+    }
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..9959882d 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -635,6 +635,10 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
                 let _ = app.run("text.edit", json!({}));
                 ui.close();
             }
+            if ui.button("Font…").clicked() {
+                let _ = app.run("format.fontDialog", json!({}));
+                ui.close();
+            }
             ui.menu_button("Bring to Front", |ui| {
                 crate::ribbon::menu_item(app, ui, crate::icons::Icon::BringToFront, "Bring to Front", "arrange.bringToFront", json!({}));
                 crate::ribbon::menu_item(app, ui, crate::icons::Icon::BringForward, "Bring Forward", "arrange.bringForward", json!({}));
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..7348b5bd 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -1,4 +1,4 @@
-//! Dialogs (Insert Table, Slide Size, Header & Footer, Hyperlink, Set Up Show, Zoom, …) and the
+//! Dialogs (Insert Table, Slide Size, Font, Header & Footer, Hyperlink, Set Up Show, Zoom, …) and the
 //! About window. The start screen is File › Home (`backstage.rs`).
 
 use egui::{Align2, Color32, CornerRadius, Rect, Sense, Stroke, Ui, pos2, vec2};
@@ -43,6 +43,7 @@ fn title(id: &str) -> &'static str {
         "renameShape" => "Rename",
         "renameLayout" => "Rename Layout",
         "paragraph" => "Paragraph",
+        "font" => "Font",
         "about" => "About DeckCraft",
         "preferences" => "Preferences",
         "export" => "Export",
@@ -382,6 +383,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             }
             ok || cancel
         }
+        "font" => font_dialog(app, ui, d),
         "paragraph" => {
             field(ui, d, "Before text (in):", "left", "0");
             field(ui, d, "Special — hanging (in):", "hang", "0");
@@ -829,3 +831,211 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+fn seed_once(d: &mut Dialog, key: &str, val: String) {
+    d.fields.entry(key.to_string()).or_insert(val);
+}
+
+fn json_text(v: Option<&Value>, default: &str) -> String {
+    match v {
+        Some(Value::String(s)) => s.clone(),
+        Some(Value::Number(n)) => n.as_f64().map(|x| crate::widgets::fmt_num(x, "")).unwrap_or_else(|| default.to_string()),
+        Some(Value::Bool(true)) => "1".into(),
+        Some(Value::Bool(false)) => "0".into(),
+        _ => default.to_string(),
+    }
+}
+
+fn color_label(v: &Value) -> String {
+    match v {
+        Value::String(s) => s.clone(),
+        Value::Object(o) => o.get("scheme").or_else(|| o.get("rgb")).and_then(Value::as_str).unwrap_or("").to_string(),
+        _ => String::new(),
+    }
+}
+
+fn seed_font_fields(d: &mut Dialog) {
+    seed_once(d, "family", json_text(d.params.get("family"), ""));
+    seed_once(d, "size", json_text(d.params.get("size"), "18"));
+    seed_once(d, "bold", json_text(d.params.get("bold"), "0"));
+    seed_once(d, "italic", json_text(d.params.get("italic"), "0"));
+    seed_once(d, "underline", json_text(d.params.get("underline"), "none"));
+    seed_once(d, "strike", json_text(d.params.get("strike"), "none"));
+    seed_once(d, "baseline", json_text(d.params.get("baseline"), "none"));
+    seed_once(d, "caps", json_text(d.params.get("caps"), "none"));
+    seed_once(d, "spacing", json_text(d.params.get("spacing"), "0"));
+    let shown = d.params.get("color").map(color_label).unwrap_or_default();
+    seed_once(d, "color", shown.clone());
+    seed_once(d, "colorSeed", shown);
+}
+
+fn choice(ui: &mut Ui, d: &mut Dialog, salt: &str, key: &str, choices: &[(&str, &str)]) {
+    let cur = d.get(key, "");
+    let label = choices.iter().find(|(v, _)| *v == cur).map(|(_, l)| *l).unwrap_or(cur.as_str());
+    egui::ComboBox::from_id_salt(salt).selected_text(label).width(140.0).show_ui(ui, |ui| {
+        for (v, l) in choices {
+            if ui.selectable_label(cur == *v, *l).clicked() {
+                d.fields.insert((*key).into(), (*v).into());
+            }
+        }
+    });
+}
+
+fn labeled_text(ui: &mut Ui, d: &mut Dialog, label: &str, key: &str, width: f32) -> String {
+    let mut v = d.get(key, "");
+    let l = ui.label(label);
+    ui.add(egui::TextEdit::singleline(&mut v).desired_width(width)).labelled_by(l.id);
+    d.fields.insert(key.into(), v.clone());
+    v
+}
+
+fn finite_pt(text: &str) -> Option<f64> {
+    text.trim().trim_end_matches("pt").trim().parse::<f64>().ok().filter(|v| v.is_finite())
+}
+
+/// Home › Font › Font…, the shape menu and Cmd+T. One OK applies every field together.
+fn font_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    ui.set_min_width(460.0);
+    seed_font_fields(d);
+    let mut fams = crate::ribbon::font_families(app);
+    let family = d.get("family", "");
+    if !family.is_empty() && !fams.iter().any(|f| f == &family) {
+        fams.insert(0, family.clone());
+    }
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(88.0, 20.0), egui::Label::new("Font"));
+        egui::ComboBox::from_id_salt("font_dialog_family").selected_text(if family.is_empty() { " " } else { family.as_str() }).width(300.0).show_ui(
+            ui,
+            |ui| {
+                egui::ScrollArea::vertical().max_height(280.0).show(ui, |ui| {
+                    for f in &fams {
+                        if ui.selectable_label(family == *f, f).clicked() {
+                            d.fields.insert("family".into(), f.clone());
+                        }
+                    }
+                });
+            },
+        );
+    });
+    ui.horizontal(|ui| {
+        let _ = labeled_text(ui, d, "Size", "size", 64.0);
+        ui.add_space(16.0);
+        check(ui, d, "Bold", "bold", false);
+        check(ui, d, "Italic", "italic", false);
+    });
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(88.0, 20.0), egui::Label::new("Underline"));
+        choice(
+            ui,
+            d,
+            "font_dialog_underline",
+            "underline",
+            &[("none", "None"), ("sng", "Single"), ("dbl", "Double"), ("heavy", "Heavy"), ("dotted", "Dotted"), ("dash", "Dash"), ("wavy", "Wavy")],
+        );
+        ui.add_space(8.0);
+        let _ = labeled_text(ui, d, "Color", "color", 110.0);
+    });
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(88.0, 20.0), egui::Label::new("Strikethrough"));
+        choice(ui, d, "font_dialog_strike", "strike", &[("none", "None"), ("sng", "Single"), ("dbl", "Double")]);
+    });
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(88.0, 20.0), egui::Label::new("Baseline"));
+        choice(ui, d, "font_dialog_baseline", "baseline", &[("none", "None"), ("super", "Superscript"), ("sub", "Subscript")]);
+        ui.add_space(8.0);
+        ui.label("Caps");
+        choice(ui, d, "font_dialog_caps", "caps", &[("none", "None"), ("small", "Small caps"), ("all", "All caps")]);
+    });
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(88.0, 20.0), egui::Label::new("Spacing"));
+        let mut spacing = d.get("spacing", "0");
+        let edited = ui.add(egui::TextEdit::singleline(&mut spacing).desired_width(64.0).hint_text("pt"));
+        let mut picked = None;
+        egui::ComboBox::from_id_salt("font_dialog_spacing")
+            .selected_text(match spacing.as_str() {
+                "-3" => "Very tight",
+                "-1.5" => "Tight",
+                "0" => "Normal",
+                "3" => "Loose",
+                "6" => "Very loose",
+                other => other,
+            })
+            .width(120.0)
+            .show_ui(ui, |ui| {
+                for (v, l) in [("-3", "Very tight"), ("-1.5", "Tight"), ("0", "Normal"), ("3", "Loose"), ("6", "Very loose")] {
+                    if ui.selectable_label(spacing == v, l).clicked() {
+                        picked = Some(v.to_string());
+                    }
+                }
+            });
+        let _ = edited;
+        if let Some(v) = picked {
+            d.fields.insert("spacing".into(), v);
+        } else {
+            d.fields.insert("spacing".into(), spacing);
+        }
+    });
+    let bold = d.get("bold", "0") == "1";
+    let italic = d.get("italic", "0") == "1";
+    let underline = d.get("underline", "none");
+    let strike = d.get("strike", "none");
+    let shown = finite_pt(&d.get("size", "18")).unwrap_or(18.0).clamp(12.0, 28.0) as f32;
+    let mut sample = egui::RichText::new("AaBbCcDd").size(shown);
+    if bold {
+        sample = sample.strong();
+    }
+    if italic {
+        sample = sample.italics();
+    }
+    if underline != "none" {
+        sample = sample.underline();
+    }
+    if strike != "none" {
+        sample = sample.strikethrough();
+    }
+    ui.add_space(6.0);
+    ui.label(sample);
+    let (ok, cancel) = buttons(ui, "OK");
+    if ok {
+        let family = d.get("family", "");
+        let family = family.trim();
+        if family.is_empty() {
+            app.set_status("Choose a font");
+            return false;
+        }
+        let Some(size) = finite_pt(&d.get("size", "")) else {
+            app.set_status("Font size must be a number");
+            return false;
+        };
+        let Some(spacing) = finite_pt(&d.get("spacing", "0")) else {
+            app.set_status("Character spacing must be a number");
+            return false;
+        };
+        let mut params = json!({
+            "family": family,
+            "size": size,
+            "bold": d.get("bold", "0") == "1",
+            "italic": d.get("italic", "0") == "1",
+            "underline": d.get("underline", "none"),
+            "strike": d.get("strike", "none"),
+            "baseline": d.get("baseline", "none"),
+            "caps": d.get("caps", "none"),
+            "spacing": spacing,
+        });
+        let color = d.get("color", "");
+        let seed = d.get("colorSeed", "");
+        if color == seed {
+            if let Some(c) = d.params.get("color").filter(|v| !v.is_null()) {
+                params["color"] = c.clone();
+            }
+        } else if !color.trim().is_empty() {
+            params["color"] = json!(color.trim());
+        }
+        let _ = app.run("format.fontDialog", params);
+    }
+    ok || cancel
+}
+
+#[cfg(test)]
+#[path = "font_dialog_tests.rs"]
+mod font_dialog_tests;
diff --git a/crates/ui-egui/src/font_dialog_tests.rs b/crates/ui-egui/src/font_dialog_tests.rs
new file mode 100644
index 00000000..06ccfc02
--- /dev/null
+++ b/crates/ui-egui/src/font_dialog_tests.rs
@@ -0,0 +1,65 @@
+//! The Font dialog: Home › Font › Font… and Cmd+T open it, OK applies one undo step, Cancel does not.
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut s = Session::with_new();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [80.0, 80.0, 320.0, 80.0], "text": "Hello"})).unwrap();
+    // A selected shape, not a caret: the dialog then formats the text that is already there.
+    let _ = s.execute("text.exit", &json!({}));
+    let app = SlideApp::new(s, Services::default());
+    let mut h = Harness::builder().with_size(egui::vec2(1440.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(4);
+    h
+}
+
+fn bold_of(h: &Harness<'_, SlideApp>) -> Option<bool> {
+    let st = h.state().session.active().unwrap();
+    st.selected_shapes()
+        .first()
+        .and_then(|sh| sh.text.as_ref())
+        .and_then(|t| t.paragraphs.first())
+        .and_then(|p| p.runs.first())
+        .and_then(|r| r.props.bold)
+}
+
+#[test]
+fn font_button_applies_bold_from_the_dialog() {
+    let mut h = harness();
+    h.get_by_label("Font…").click();
+    // The opening frame ignores the click that summoned the window; the next one is live.
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("font"));
+    // A pointer click on this checkbox does not register through kittest's per-event frames;
+    // the accessibility click does, and it is the same toggle a pointer click runs.
+    h.get_by_label("Bold").click_accesskit();
+    h.run_steps(1);
+    h.get_by_label("OK").click();
+    h.run_steps(1);
+    assert!(h.state().dialog.is_none(), "status {:?}", h.state().status);
+    assert_eq!(bold_of(&h), Some(true));
+    assert_eq!(h.state().session.active().unwrap().history.undo.last().unwrap().label, "Font…");
+}
+
+#[test]
+fn command_t_opens_the_font_dialog_and_cancel_keeps_the_text() {
+    let mut h = harness();
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::T);
+    h.run_steps(1);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("font"), "status {:?}", h.state().status);
+    h.get_by_label("Cancel").click();
+    h.run_steps(1);
+    assert!(h.state().dialog.is_none());
+    assert_eq!(bold_of(&h), None);
+}
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..c294278f 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -222,6 +222,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
         (
             "Format",
             vec![
+                ("Font…", "format.fontDialog"),
                 ("Bold", "format.bold"),
                 ("Italic", "format.italic"),
                 ("Underline", "format.underline"),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..d67aaf0a 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -502,6 +502,9 @@ fn font_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                         run(app, "format.color", json!({"color": cref_param(&c)}));
                     }
                 });
+                if ui.add_enabled(en, egui::Button::new("Font…").min_size(vec2(52.0, 22.0))).on_hover_text("Font").clicked() {
+                    run(app, "format.fontDialog", json!({}));
+                }
             });
         });
     });
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..c844d460 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog, 227 commands, 28 dialogs; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -20,8 +20,8 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Font dialog; command registry 227; 28 dialogs |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..4368c0d4 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,8 +203,9 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60. The Font dialog is in (family, size, style, underline,
+  colour, strikethrough, baseline, caps, character spacing, one undo step). Still missing: Bullets
+  and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object…. 6–12 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -256,6 +257,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Font dialog sets typeface, size, style, underline, colour, strikethrough, baseline, caps and character spacing in one step |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..a31d0964 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (227 commands; previous: minor, hours to ~95% per audience added; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -239,7 +239,7 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 226 commands, every one reachable from `deckcraft-cli`, the JSON control channel
+- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
   and MCP.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Command count 226 → 227 (Font dialog). Breadth and ready percentages unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..6362973b 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -2,7 +2,7 @@
 
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog; previous: minor, text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Font, Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -91,8 +91,8 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 ## Keyboard shortcuts
 
 Every common PowerPoint for Mac shortcut is bound (checklist row done): new slide, duplicate,
-group/ungroup, bold/italic/underline, alignment, font size, list levels, Format Painter, show from
-start/current, view switching. Not yet: Cmd+F Find opening a find bar on the slide, Option+drag
+group/ungroup, bold/italic/underline, alignment, font size, list levels, Format Painter, the Font
+dialog (Cmd+T), show from start/current, view switching. Not yet: Cmd+F Find opening a find bar on the slide, Option+drag
 precision without snapping, F6 pane cycling, ribbon KeyTips (Windows).
 
 ### Text editing keys
@@ -137,7 +137,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 |---|---|
 | Native macOS menu bar from `menu_tree()`, filled out to PowerPoint's menu items | 3–5 |
 | Format Shape pane depth | 6–10 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
+| Missing dialogs (Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 6–12 |
 | Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
 | Grid Options, edit points UI, crop depth | 4–7 |
 | Multiple windows | 3–5 |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Font dialog from Home › Font, the shape menu and Cmd+T |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From a4ed08b687e65795b8e31b097854e7706fc3c764 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:47:28 +0300
Subject: [PATCH 239/376] SmartArt: layout thumbnails in galleries and live
 preview on hover

---
 crates/engine/src/cmd/smartart.rs    |  28 +++++++
 crates/ui-egui/src/ribbon.rs         | 109 ++++++++++++++++++---------
 crates/ui-egui/src/smartart_tests.rs |  36 ++++++++-
 crates/ui-egui/src/textures.rs       |  48 ++++++++++++
 crates/ui-egui/src/widgets.rs        |   3 +
 5 files changed, 188 insertions(+), 36 deletions(-)

diff --git a/crates/engine/src/cmd/smartart.rs b/crates/engine/src/cmd/smartart.rs
index 66b8dda4..03276e9f 100644
--- a/crates/engine/src/cmd/smartart.rs
+++ b/crates/engine/src/cmd/smartart.rs
@@ -126,6 +126,34 @@ pub fn category(kind: &str) -> &'static str {
     }
 }
 
+/// A layout's gallery picture: the graphic drawn with sample nodes (or `nodes`) in a 320 × 200 pt
+/// group at the origin, in the style and colours given, with no text in the samples.
+pub fn preview(kind: &str, style: &str, colors: &str, nodes: Option<&[DiagramNode]>) -> Shape {
+    let sample = |levels: &[u8]| -> Vec<DiagramNode> { levels.iter().map(|l| DiagramNode { level: *l, ..Default::default() }).collect() };
+    let nodes = match nodes {
+        Some(n) if !n.is_empty() => n.to_vec(),
+        _ => match category(kind) {
+            "hierarchy" => sample(&[0, 1, 2, 2, 1]),
+            "matrix" => sample(&[0, 0, 0, 0, 0]),
+            "list" if kind != "blockList" && kind != "tableList" => sample(&[0, 1, 0, 1, 0, 1]),
+            _ => sample(&[0, 0, 0, 0]),
+        },
+    };
+    let d = Diagram { kind: kind.into(), nodes, style: style.into(), colors: colors.into(), ..Default::default() };
+    let area = Xfrm::new(0.0, 0.0, 320.0, 200.0);
+    let mut children = layout(&d, area);
+    for (k, c) in children.iter_mut().enumerate() {
+        c.id = ShapeId(10_000 + k as u32);
+    }
+    Shape {
+        id: ShapeId(9_999),
+        name: "SmartArt preview".into(),
+        xfrm: Some(area),
+        kind: ShapeKind::Group { children, child: area },
+        ..Default::default()
+    }
+}
+
 pub fn is_kind(k: &str) -> bool {
     LAYOUTS.iter().any(|(id, _)| *id == k)
 }
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 0b8c4e6f..ea931b96 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -541,37 +541,79 @@ pub fn cref_param(c: &deckcraft_model::ColorRef) -> Value {
 
 /// Convert to SmartArt: the layouts by category, three to a row; a click converts the selected
 /// text.
-fn smartart_gallery(app: &mut SlideApp, ui: &mut Ui) {
+/// A layout gallery grouped by category, each layout as a small cached picture with its name.
+/// Clicking runs `cmd` with `{"kind": …}` plus `extra`; hovering shows the layout larger, drawn
+/// with `nodes` (the selected graphic's outline) when given: a live preview without touching the
+/// document.
+fn smartart_gallery(
+    app: &mut SlideApp,
+    ui: &mut Ui,
+    cmd: &str,
+    extra: Value,
+    current: &str,
+    style: &str,
+    colors: &str,
+    nodes: Option<&[deckcraft_model::DiagramNode]>,
+) {
     use deckcraft_engine::cmd::smartart::{LAYOUTS, category};
-    ui.set_min_width(420.0);
-    for (cat, title) in [
-        ("list", "List"),
-        ("process", "Process"),
-        ("cycle", "Cycle"),
-        ("hierarchy", "Hierarchy"),
-        ("relationship", "Relationship"),
-        ("matrix", "Matrix"),
-        ("pyramid", "Pyramid"),
-        ("picture", "Picture"),
-    ] {
-        let kinds: Vec<(&str, &str)> = LAYOUTS.iter().copied().filter(|(k, _)| category(k) == cat).collect();
-        if kinds.is_empty() {
-            continue;
-        }
-        ui.label(egui::RichText::new(title).strong());
-        egui::Grid::new(("smartart_gallery", cat)).num_columns(3).spacing([6.0, 2.0]).show(ui, |ui| {
-            for (i, (k, label)) in kinds.iter().enumerate() {
-                if ui.add_sized([136.0, 22.0], egui::Button::new(*label)).clicked() {
-                    run(app, "smartArt.fromText", json!({"kind": k}));
-                    ui.close();
-                }
-                if i % 3 == 2 {
-                    ui.end_row();
-                }
+    ui.set_min_width(440.0);
+    let slide = app.session.active().map(|d| d.selection.slide).unwrap_or(0);
+    egui::ScrollArea::vertical().max_height(520.0).show(ui, |ui| {
+        for (cat, title) in [
+            ("list", "List"),
+            ("process", "Process"),
+            ("cycle", "Cycle"),
+            ("hierarchy", "Hierarchy"),
+            ("relationship", "Relationship"),
+            ("matrix", "Matrix"),
+            ("pyramid", "Pyramid"),
+            ("picture", "Picture"),
+        ] {
+            let kinds: Vec<(&str, &str)> = LAYOUTS.iter().copied().filter(|(k, _)| category(k) == cat).collect();
+            if kinds.is_empty() {
+                continue;
             }
-        });
-        ui.separator();
-    }
+            ui.label(egui::RichText::new(title).strong());
+            egui::Grid::new(("smartart_gallery", cat)).num_columns(4).spacing([6.0, 6.0]).show(ui, |ui| {
+                for (i, (k, label)) in kinds.iter().enumerate() {
+                    let ctx = ui.ctx().clone();
+                    let thumb = app.session.active().and_then(|d| app.textures.smartart(&ctx, &d.doc, slide, k, style, colors, None, 192));
+                    let r = ui
+                        .vertical_centered(|ui| {
+                            ui.set_width(100.0);
+                            let r = match &thumb {
+                                Some(t) => {
+                                    ui.add(egui::Button::image(egui::Image::new(t).fit_to_exact_size(egui::vec2(96.0, 60.0))).selected(*k == current))
+                                }
+                                None => ui.add_sized([96.0, 60.0], egui::Button::new("").selected(*k == current)),
+                            };
+                            ui.add(egui::Label::new(egui::RichText::new(*label).small()).truncate().selectable(false));
+                            r.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, true, *label));
+                            r.on_hover_text(*label)
+                        })
+                        .inner;
+                    if r.hovered() {
+                        let preview = app.session.active().and_then(|d| app.textures.smartart(&ctx, &d.doc, slide, k, style, colors, nodes, 480));
+                        if let Some(t) = preview {
+                            r.show_tooltip_ui(|ui| {
+                                ui.add(egui::Image::new(&t).fit_to_exact_size(egui::vec2(320.0, 200.0)));
+                            });
+                        }
+                    }
+                    if r.clicked() {
+                        let mut args = extra.clone();
+                        args["kind"] = json!(k);
+                        run(app, cmd, args);
+                        ui.close();
+                    }
+                    if i % 4 == 3 {
+                        ui.end_row();
+                    }
+                }
+            });
+            ui.separator();
+        }
+    });
 }
 
 fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
@@ -673,7 +715,7 @@ fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                     }
                 });
                 let r = icon_toggle(ui, Icon::SmartArt, "Convert to SmartArt", enabled(app, "smartArt.fromText"), false);
-                egui::Popup::menu(&r).show(|ui| smartart_gallery(app, ui));
+                egui::Popup::menu(&r).show(|ui| smartart_gallery(app, ui, "smartArt.fromText", json!({}), "", "", "", None));
             });
         });
     });
@@ -2405,12 +2447,9 @@ fn smartart_design(app: &mut SlideApp, ui: &mut Ui) {
     });
     group(ui, |ui| {
         let (r, _) = small_button_ex(ui, Icon::Layout, "Layouts", gid.is_some(), false, true);
+        let outline = sel.as_ref().map(|(_, d)| d.nodes.clone());
         egui::Popup::menu(&r).show(|ui| {
-            for (k, label) in deckcraft_engine::cmd::smartart::LAYOUTS {
-                if ui.selectable_label(kind == k, label).clicked() {
-                    run(app, "smartArt.layout", json!({"id": gid, "kind": k}));
-                }
-            }
+            smartart_gallery(app, ui, "smartArt.layout", json!({"id": gid}), &kind, &style, &colors, outline.as_deref());
         });
         let (r, _) = small_button_ex(ui, Icon::Layout, "Convert", gid.is_some(), false, true);
         egui::Popup::menu(&r).show(|ui| {
diff --git a/crates/ui-egui/src/smartart_tests.rs b/crates/ui-egui/src/smartart_tests.rs
index 9d88e465..0e668439 100644
--- a/crates/ui-egui/src/smartart_tests.rs
+++ b/crates/ui-egui/src/smartart_tests.rs
@@ -68,10 +68,44 @@ fn home_convert_to_smartart_gallery_converts_the_text() {
     h.run_steps(3);
     h.get_by_label("Convert to SmartArt").click();
     h.run_steps(3);
-    h.get_by_label("Basic Block List").click();
+    h.get_by_role_and_label(egui::accesskit::Role::Button, "Basic Block List").click();
     h.run_steps(3);
     let st = h.state().session.active().unwrap();
     let (_, d) = deckcraft_engine::cmd::smartart::selected(st).expect("the text became a SmartArt graphic");
     assert_eq!(d.kind, "blockList");
     assert_eq!(d.nodes.len(), 3);
 }
+
+#[test]
+fn layout_gallery_shows_cached_pictures_and_previews_on_hover() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+    s.execute("insert.smartArt", &json!({"kind": "process", "items": ["Plan", "Build", "Ship"]})).unwrap();
+    let mut app = SlideApp::new(s, Services::default());
+    app.ui.tab = "SmartArt Design".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h.get_by_label("Layouts").click();
+    h.run_steps(3);
+    let first = h.state().textures.smartart_cached();
+    assert!(first >= deckcraft_engine::cmd::smartart::LAYOUTS.len().min(8), "gallery pictures were drawn: {first}");
+    h.get_by_role_and_label(egui::accesskit::Role::Button, "Vertical Box List").hover();
+    h.run_steps(3);
+    if let Ok(path) = std::env::var("SMARTART_GALLERY_PNG") {
+        h.render().expect("render").save(path).unwrap();
+    }
+    let hovered = h.state().textures.smartart_cached();
+    assert!(hovered > first, "hovering drew a preview of the graphic's own outline");
+    h.run_steps(3);
+    assert_eq!(h.state().textures.smartart_cached(), hovered, "pictures are cached, not redrawn every frame");
+    h.get_by_role_and_label(egui::accesskit::Role::Button, "Vertical Box List").click();
+    h.run_steps(3);
+    let st = h.state().session.active().unwrap();
+    assert_eq!(deckcraft_engine::cmd::smartart::selected(st).unwrap().1.kind, "verticalBoxList");
+}
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index 40498422..c9789f86 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -46,10 +46,58 @@ pub struct Textures {
     /// Canvas renders so far (tests, performance checks).
     pub canvas_renders: u64,
     thumbs: HashMap<usize, Entry>,
+    /// SmartArt gallery pictures by layout, style and colours (and, for hover previews, the
+    /// outline's hash).
+    smartart: HashMap<String, TextureHandle>,
     clock: u64,
     pub last_render_ms: f64,
 }
 
+impl Textures {
+    /// SmartArt gallery pictures cached so far (tests).
+    pub fn smartart_cached(&self) -> usize {
+        self.smartart.len()
+    }
+
+    /// A SmartArt layout drawn small for a gallery (`nodes` for a preview of the selected
+    /// graphic's own outline), cached; drawn with the active presentation's theme.
+    pub fn smartart(
+        &mut self,
+        ctx: &egui::Context,
+        p: &deckcraft_model::Presentation,
+        slide: usize,
+        kind: &str,
+        style: &str,
+        colors: &str,
+        nodes: Option<&[deckcraft_model::DiagramNode]>,
+        width_px: u32,
+    ) -> Option<TextureHandle> {
+        let mut key = format!("{kind}|{style}|{colors}|{width_px}");
+        if let Some(n) = nodes {
+            use std::hash::{Hash, Hasher};
+            let mut h = std::collections::hash_map::DefaultHasher::new();
+            for x in n {
+                (x.text.as_str(), x.level).hash(&mut h);
+            }
+            key.push_str(&format!("|{:x}", h.finish()));
+        }
+        if let Some(t) = self.smartart.get(&key) {
+            return Some(t.clone());
+        }
+        let mut s = p.slides.get(slide).or_else(|| p.slides.first())?.as_ref().clone();
+        let g = deckcraft_engine::cmd::smartart::preview(kind, style, colors, nodes);
+        let id = g.id;
+        s.shapes = vec![g];
+        let img = deckcraft_render::render_shape(p, &s, id, width_px as f64 / 336.0)?;
+        let tex = ctx.load_texture(format!("smartart-{key}"), to_color_image(&img, false), TextureOptions::LINEAR);
+        if self.smartart.len() > 300 {
+            self.smartart.clear();
+        }
+        self.smartart.insert(key, tex.clone());
+        Some(tex)
+    }
+}
+
 pub fn to_color_image(img: &Image, grayscale: bool) -> ColorImage {
     let w = img.width as usize;
     let h = img.height as usize;
diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 1f26fea1..7f7d0ecd 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -117,6 +117,9 @@ pub fn small_button_ex(ui: &mut Ui, icon: Icon, label: &str, enabled: bool, sele
     let arrow_w = if split { 12.0 } else { 0.0 };
     let w = 24.0 + tw + arrow_w;
     let (rect, resp) = ui.allocate_exact_size(vec2(w, 22.0), if enabled { Sense::click() } else { Sense::hover() });
+    if !label.is_empty() {
+        resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, label));
+    }
     let painter = ui.painter_at(rect);
     let main_rect = Rect::from_min_max(rect.min, pos2(rect.max.x - arrow_w, rect.max.y));
     let main_resp =

From b1ce243806b0db6327014b9d8795f2d5dd01a41f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:47:34 +0300
Subject: [PATCH 240/376] Spelling: notes right-click menu, Review > Language
 with Do Not Check Spelling, repeated words

---
 crates/engine/src/cmd/format.rs      | 27 ++++++++
 crates/engine/src/cmd/review.rs      | 12 +++-
 crates/engine/src/spell.rs           | 58 +++++++++++++++-
 crates/engine/src/tests.rs           | 21 ++++++
 crates/ui-egui/src/canvas.rs         | 39 ++++++++++-
 crates/ui-egui/src/dialogs.rs        | 94 ++++++++++++++++++++++----
 crates/ui-egui/src/spelling_tests.rs | 98 ++++++++++++++++++++++++++++
 crates/ui-egui/src/squiggles.rs      | 58 ++++++++++++++--
 crates/ui-egui/src/status.rs         | 71 +++++++++++++++++++-
 docs/gaps.md                         |  9 ++-
 10 files changed, 459 insertions(+), 28 deletions(-)

diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index c68d1242..4e39a2e2 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -48,6 +48,15 @@ pub fn specs() -> Vec<CommandSpec> {
             has_text_or_shapes,
             color
         ),
+        cmd!(
+            "format.language",
+            "Language",
+            ["Review", "Language"],
+            None,
+            "{lang?, noProof?: bool} (proofing language of the selected text, and Do Not Check Spelling)",
+            has_text_or_shapes,
+            language
+        ),
         cmd!("format.highlight", "Text Highlight Color", ["Home", "Font"], None, "{color? (absent = none)}", has_text_or_shapes, highlight),
         cmd!(
             "format.case",
@@ -293,6 +302,24 @@ fn color(s: &mut Session, p: &Value) -> Result<Value> {
     let c = color_param(p, "color").ok_or_else(|| bad("format.color", "missing or invalid `color`"))?;
     format_run(s, &move |r| r.fill = Some(Fill::solid(c.clone())))
 }
+fn language(s: &mut Session, p: &Value) -> Result<Value> {
+    let lang = str_param(p, "lang").map(str::to_string);
+    let no_proof = bool_param(p, "noProof");
+    if lang.is_none() && no_proof.is_none() {
+        return Err(bad("format.language", "give `lang` or `noProof`"));
+    }
+    if lang.as_deref().is_some_and(|l| l.is_empty() || l.len() > 35 || !l.chars().all(|c| c.is_ascii_alphanumeric() || c == '-')) {
+        return Err(bad("format.language", "`lang` is a language tag such as en-US"));
+    }
+    format_run(s, &move |r| {
+        if let Some(l) = &lang {
+            r.lang = Some(l.clone());
+        }
+        if let Some(n) = no_proof {
+            r.no_proof = n.then_some(true);
+        }
+    })
+}
 fn highlight(s: &mut Session, p: &Value) -> Result<Value> {
     let c = color_param(p, "color");
     format_run(s, &move |r| r.highlight = c.clone())
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index d11d19e9..5b038821 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -16,7 +16,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("comment.resolve", "Resolve Thread", ["Comments"], None, "{index, resolved?: bool}", has_slide, resolve),
         cmd!(query "comment.list", "Comments", [], None, "{slide?} → comments", has_slide, list),
         cmd!(query "review.accessibility", "Check Accessibility", ["Review", "Accessibility"], None, "{} → [{slide, shape, issue}]", has_doc, accessibility),
-        cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{lang?, ignore?:[word]} → [{slide, shape?, row?, col?, notes?, para, start, end, word, lang, suggestions}] (shapes, table cells and notes; each run in its own language, lang? for runs without one; Hunspell dictionaries installed on the system, else a built-in list of common misspellings)", has_doc, spelling),
+        cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{lang?, ignore?:[word]} → [{slide, shape?, row?, col?, notes?, para, start, end, word, lang, suggestions}] (shapes, table cells and notes; repeated words as {repeated, deleteFrom}; runs marked noProof skipped; each run in its own language, lang? for runs without one; Hunspell dictionaries installed on the system, else a built-in list of common misspellings)", has_doc, spelling),
         cmd!(
             "review.spellingChange",
             "Change Spelling",
@@ -236,8 +236,16 @@ fn spelling(s: &mut Session, p: &Value) -> Result<Value> {
     let mut out = vec![];
     // Each misspelt word of `para`, reported with `at` (where the paragraph is) merged in.
     let mut check = |para: &deckcraft_model::Paragraph, at: Value, out: &mut Vec<Value>| {
+        for w in crate::spell::repeated(para, &default) {
+            let mut v = json!({"start": w.start, "end": w.end, "word": w.text, "lang": w.lang, "repeated": true, "deleteFrom": w.repeated, "suggestions": []});
+            if let (Some(o), Some(a)) = (v.as_object_mut(), at.as_object()) {
+                o.extend(a.clone());
+            }
+            out.push(v);
+        }
+        let rep: Vec<usize> = crate::spell::repeated(para, &default).iter().map(|w| w.start).collect();
         for w in crate::spell::paragraph_words(para, &default) {
-            if ignore.contains(&w.text.to_lowercase()) {
+            if ignore.contains(&w.text.to_lowercase()) || rep.contains(&w.start) {
                 continue;
             }
             let dict = dicts.entry(w.lang.clone()).or_insert_with(|| crate::spell::dictionary(&w.lang)).clone();
diff --git a/crates/engine/src/spell.rs b/crates/engine/src/spell.rs
index bf0e1660..965e8578 100644
--- a/crates/engine/src/spell.rs
+++ b/crates/engine/src/spell.rs
@@ -660,6 +660,9 @@ pub struct Word {
     pub end: usize,
     pub text: String,
     pub lang: String,
+    /// The same word twice in a row: this is the second, and deleting `cut..end` removes it with
+    /// the space before it.
+    pub repeated: Option<usize>,
 }
 
 /// The words of `p`, each with its run's language (`lang` on the run, else `default`). Words
@@ -700,7 +703,11 @@ pub fn paragraph_words(p: &deckcraft_model::Paragraph, default: &str) -> Vec<Wor
             if !part.is_empty()
                 && let Some(c) = chars.get(k)
             {
-                out.push(Word { start: k, end: k + n, text: part.to_string(), lang: lang_of(c.1) });
+                if p.runs.get(c.1).is_some_and(|r| r.props.no_proof == Some(true)) {
+                    // Marked "do not check spelling".
+                } else {
+                    out.push(Word { start: k, end: k + n, text: part.to_string(), lang: lang_of(c.1), repeated: None });
+                }
             }
             k += n + 1;
         }
@@ -708,7 +715,27 @@ pub fn paragraph_words(p: &deckcraft_model::Paragraph, default: &str) -> Vec<Wor
     out
 }
 
-/// The misspelt words of `p`, each checked in its own language (languages with no dictionary
+/// Words that repeat the word just before them (`the the`), with only spaces between, as
+/// PowerPoint flags them. Hyphenated parts and different languages don't count.
+pub fn repeated(p: &deckcraft_model::Paragraph, default: &str) -> Vec<Word> {
+    let words = paragraph_words(p, default);
+    let chars: Vec<char> = p.runs.iter().flat_map(|r| r.content().chars()).collect();
+    let mut out = vec![];
+    for pair in words.windows(2) {
+        let (a, b) = (&pair[0], &pair[1]);
+        let gap = chars.get(a.end..b.start).unwrap_or(&[]);
+        if !gap.is_empty()
+            && gap.iter().all(|c| *c == ' ' || *c == '\u{a0}' || *c == '\t')
+            && a.lang == b.lang
+            && a.text.to_lowercase() == b.text.to_lowercase()
+        {
+            out.push(Word { repeated: Some(a.end), ..b.clone() });
+        }
+    }
+    out
+}
+
+/// The misspelt and repeated words of `p`, each checked in its own language (languages with no dictionary
 /// installed are skipped), leaving out `ignore` (lower-case).
 pub fn misspelt(p: &deckcraft_model::Paragraph, default: &str, ignore: &[String]) -> Vec<Word> {
     let mut dicts: HashMap<String, Option<Arc<Dictionary>>> = HashMap::new();
@@ -719,7 +746,18 @@ pub fn misspelt(p: &deckcraft_model::Paragraph, default: &str, ignore: &[String]
             let d = dicts.entry(w.lang.clone()).or_insert_with(|| dictionary(&w.lang));
             d.as_ref().is_some_and(|d| !is_correct(d, &w.text))
         })
-        .collect()
+        .chain(repeated(p, default))
+        .collect::<Vec<_>>()
+        .into_iter()
+        .fold(vec![], |mut v: Vec<Word>, w| {
+            // A repeated misspelt word is reported once, as repeated.
+            if let Some(i) = v.iter().position(|x| x.start == w.start) {
+                v[i] = w;
+            } else {
+                v.push(w);
+            }
+            v
+        })
 }
 
 /// Use `d` for `lang` from now on in this process (a dictionary the app loaded itself).
@@ -803,6 +841,20 @@ SFX D Y 1\nSFX D 0 ed/S .\n";
         );
     }
 
+    #[test]
+    fn repeated_words_and_no_proof_runs() {
+        use deckcraft_model::{Paragraph, Run, RunProps};
+        let p = Paragraph::new("See the the plan, plan. The THE end");
+        let r: Vec<(usize, usize, Option<usize>)> = repeated(&p, "en-US").iter().map(|w| (w.start, w.end, w.repeated)).collect();
+        assert_eq!(r, vec![(8, 11, Some(7)), (28, 31, Some(27))]);
+        let p = Paragraph {
+            runs: vec![Run::new("check "), Run::with("xyzzy qq", RunProps { no_proof: Some(true), ..Default::default() }), Run::new(" done")],
+            ..Default::default()
+        };
+        let w: Vec<String> = paragraph_words(&p, "en-US").into_iter().map(|w| w.text).collect();
+        assert_eq!(w, vec!["check", "done"]);
+    }
+
     #[test]
     fn long_and_numeric_flags_and_latin1() {
         let d = Dictionary::parse(b"FLAG long\nSFX Aa Y 1\nSFX Aa 0 s .\n", b"1\ncat/Aa\n");
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 0e3884ac..df84367a 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -909,3 +909,24 @@ fn spelling_checks_each_run_in_its_language_and_learns_words() {
     assert_eq!(std::fs::read_to_string(dir.join("user.dic")).unwrap(), "deckcraft\n");
     let _ = std::fs::remove_dir_all(&dir);
 }
+
+#[test]
+fn language_marks_text_and_no_proof_and_repeats_are_reported() {
+    crate::spell::install("xx-LN", crate::spell::Dictionary::parse(b"", b"3\nthe\nend\nis\n"));
+    let mut s = session();
+    let r = s.execute("shape.insert", &json!({"preset": "rect", "rect": [100, 100, 300, 100], "text": "the the end is nigh"})).unwrap();
+    let id = r["id"].as_u64().unwrap();
+    s.execute("edit.select", &json!({"ids": [id]})).unwrap();
+    s.execute("format.language", &json!({"lang": "xx-LN"})).unwrap();
+    let v = s.execute("review.spelling", &json!({})).unwrap();
+    let got: Vec<(String, bool)> = v.as_array().unwrap().iter().map(|w| (w["word"].as_str().unwrap().to_string(), w["repeated"] == true)).collect();
+    assert_eq!(got, vec![("the".to_string(), true), ("nigh".to_string(), false)]);
+    assert_eq!(v[0]["deleteFrom"], 3);
+    // Deleting the repeat through the exact-occurrence change.
+    s.execute("review.spellingChange", &json!({"shape": id, "para": 0, "start": 3, "word": " the", "to": ""})).unwrap();
+    let v = s.execute("shape.inspect", &json!({"id": id})).unwrap();
+    assert_eq!(v["shape"]["text"]["paragraphs"][0]["runs"][0]["text"], "the end is nigh");
+    s.execute("format.language", &json!({"noProof": true})).unwrap();
+    assert!(s.execute("review.spelling", &json!({})).unwrap().as_array().unwrap().is_empty());
+    assert!(s.execute("format.language", &json!({"lang": "en US!"})).is_err());
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index a2a4a967..e810fd4b 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -638,7 +638,44 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
     resp.context_menu(|ui| {
         // A misspelt word under the pointer: its suggestions, then Ignore All and Add to Dictionary.
         if let Some(w) = app.squiggles.menu_word.clone() {
-            if w.suggestions.is_empty() {
+            if let Some(from) = w.delete_from {
+                if ui.button(egui::RichText::new("Delete Repeated Word").strong()).clicked() {
+                    let cut: String = format!("{}{}", " ".repeat(w.start - from), w.word);
+                    // The gap is spaces; take it from the text so tabs or no-break spaces match.
+                    let gap = app
+                        .session
+                        .active()
+                        .and_then(|st| match w.tag {
+                            crate::squiggles::Tag::Shape { id, para } => st.shape(id)?.text.as_ref()?.paragraphs.get(para).map(|p| p.text()),
+                            crate::squiggles::Tag::Cell { id, row, col, para } => match &st.shape(id)?.kind {
+                                deckcraft_model::ShapeKind::Table(tb) => tb.cell(row, col)?.text.paragraphs.get(para).map(|p| p.text()),
+                                _ => None,
+                            },
+                            crate::squiggles::Tag::Notes { .. } => None,
+                        })
+                        .map(|t| t.chars().skip(from).take(w.start + w.word.chars().count() - from).collect::<String>())
+                        .unwrap_or(cut);
+                    let mut p = json!({"para": 0, "start": from, "word": gap, "to": ""});
+                    if let Some(o) = p.as_object_mut() {
+                        match w.tag {
+                            crate::squiggles::Tag::Shape { id, para } => {
+                                o.insert("shape".into(), json!(id));
+                                o.insert("para".into(), json!(para));
+                            }
+                            crate::squiggles::Tag::Cell { id, row, col, para } => {
+                                o.insert("shape".into(), json!(id));
+                                o.insert("row".into(), json!(row));
+                                o.insert("col".into(), json!(col));
+                                o.insert("para".into(), json!(para));
+                            }
+                            crate::squiggles::Tag::Notes { .. } => {}
+                        }
+                    }
+                    let _ = app.run("review.spellingChange", p);
+                    app.squiggles.menu_word = None;
+                    ui.close();
+                }
+            } else if w.suggestions.is_empty() {
                 ui.label(egui::RichText::new("(no spelling suggestions)").weak());
             }
             for to in &w.suggestions {
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index c2380db3..4c87fa6d 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -567,6 +567,36 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                         .and_then(Value::as_array)
                         .map(|a| a.iter().filter_map(Value::as_str).map(str::to_string).collect())
                         .unwrap_or_default();
+                    if item.get("repeated").and_then(Value::as_bool).unwrap_or(false) && !item.get("notes").and_then(Value::as_bool).unwrap_or(false)
+                    {
+                        ui.horizontal(|ui| {
+                            ui.add_space(16.0);
+                            ui.label(egui::RichText::new("Repeated word").weak());
+                            if ui.small_button("Delete Repeated Word").clicked() {
+                                let from = item.get("deleteFrom").and_then(Value::as_u64).unwrap_or(0) as usize;
+                                let end = item.get("end").and_then(Value::as_u64).unwrap_or(0) as usize;
+                                let para = item.get("para").and_then(Value::as_u64).unwrap_or(0) as usize;
+                                let text = app.session.active().and_then(|st| {
+                                    let sh = st.shape(deckcraft_model::ShapeId(shape.as_u64()? as u32))?;
+                                    let pp = match (item.get("row").and_then(Value::as_u64), item.get("col").and_then(Value::as_u64), &sh.kind) {
+                                        (Some(r), Some(c), deckcraft_model::ShapeKind::Table(tb)) => {
+                                            tb.cell(r as usize, c as usize)?.text.paragraphs.get(para)?.text()
+                                        }
+                                        _ => sh.text.as_ref()?.paragraphs.get(para)?.text(),
+                                    };
+                                    Some(pp.chars().skip(from).take(end.saturating_sub(from)).collect::<String>())
+                                });
+                                if let Some(gap) = text {
+                                    let mut p = json!({"shape": shape, "para": para, "start": from, "word": gap, "to": ""});
+                                    if let (Some(o), Some(r), Some(c)) = (p.as_object_mut(), item.get("row"), item.get("col")) {
+                                        o.insert("row".into(), r.clone());
+                                        o.insert("col".into(), c.clone());
+                                    }
+                                    run(app, "review.spellingChange", p);
+                                }
+                            }
+                        });
+                    }
                     if !sug.is_empty() {
                         ui.horizontal_wrapped(|ui| {
                             ui.add_space(16.0);
@@ -653,22 +683,33 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             ok || cancel
         }
         "language" => {
+            // Starts from the selected text's language and Do Not Check Spelling.
+            let (cur, np) = selected_language(app);
+            let lang = d.get("lang", &cur);
+            let mut no_proof = d.get("noProof", if np { "1" } else { "" }) == "1";
             ui.label("Mark selected text as:");
-            for l in [
-                "English (United States)",
-                "English (United Kingdom)",
-                "Español",
-                "Français",
-                "Deutsch",
-                "Italiano",
-                "Português",
-                "日本語",
-                "中文",
-                "العربية",
-            ] {
-                let _ = ui.selectable_label(l.starts_with("English (United States)"), l);
+            egui::ScrollArea::vertical().max_height(220.0).show(ui, |ui| {
+                // The selection's own language first when the list doesn't have it.
+                let own = (!crate::squiggles::LANGS.iter().any(|(_, t)| t.eq_ignore_ascii_case(&cur))).then(|| (cur.clone(), cur.clone()));
+                let all = own.into_iter().chain(crate::squiggles::LANGS.iter().map(|(n, t)| (n.to_string(), t.to_string())));
+                for (name, tag) in all {
+                    let installed = deckcraft_engine::spell::dictionary(&tag).is_some();
+                    let label = if installed { format!("{name}  (dictionary)") } else { name };
+                    if ui.selectable_label(lang.eq_ignore_ascii_case(&tag), label).clicked() {
+                        d.fields.insert("lang".into(), tag);
+                    }
+                }
+            });
+            ui.add_space(4.0);
+            ui.label(egui::RichText::new("Spelling is checked for languages marked (dictionary).").small().weak());
+            if ui.checkbox(&mut no_proof, "Do not check spelling or grammar").changed() {
+                d.fields.insert("noProof".into(), if no_proof { "1".into() } else { String::new() });
             }
             let (ok, cancel) = buttons(ui, "OK");
+            if ok {
+                let lang = d.get("lang", &cur);
+                run(app, "format.language", json!({"lang": lang, "noProof": no_proof}));
+            }
             ok || cancel
         }
         "customShow" => {
@@ -928,6 +969,33 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
     ));
 }
 
+/// The selection's proofing language and whether it's marked Do Not Check Spelling: the run at
+/// the caret, else the first run of the first selected shape; US English when none says.
+pub fn selected_language(app: &SlideApp) -> (String, bool) {
+    let Some(st) = app.session.active() else { return ("en-US".into(), false) };
+    let run = |sh: &deckcraft_model::Shape, at: Option<(usize, usize)>| -> Option<deckcraft_model::RunProps> {
+        let t = sh.text.as_ref()?;
+        if let Some((p, c)) = at {
+            let para = t.paragraphs.get(p)?;
+            let mut n = 0;
+            for r in &para.runs {
+                n += r.char_len();
+                if c <= n {
+                    return Some(r.props.clone());
+                }
+            }
+            return para.runs.last().map(|r| r.props.clone());
+        }
+        t.paragraphs.iter().flat_map(|p| &p.runs).next().map(|r| r.props.clone())
+    };
+    let props = match &st.selection.text {
+        Some(t) if !t.notes && t.cell.is_none() => st.shape(t.shape).and_then(|sh| run(sh, Some(t.caret))),
+        _ => st.selection.shapes.first().and_then(|id| st.shape(*id)).and_then(|sh| run(sh, None)),
+    };
+    let props = props.unwrap_or_default();
+    (props.lang.unwrap_or_else(|| "en-US".into()), props.no_proof == Some(true))
+}
+
 #[cfg(test)]
 #[path = "spelling_tests.rs"]
 mod spelling_tests;
diff --git a/crates/ui-egui/src/spelling_tests.rs b/crates/ui-egui/src/spelling_tests.rs
index 725ae508..e88ea23f 100644
--- a/crates/ui-egui/src/spelling_tests.rs
+++ b/crates/ui-egui/src/spelling_tests.rs
@@ -179,3 +179,101 @@ fn squiggles_in_table_cells_and_notes_and_on_the_ui_thread() {
     let words: Vec<&str> = v.as_array().unwrap().iter().filter_map(|w| w["word"].as_str()).collect();
     assert_eq!(words, vec!["Soth", "Remmeber", "totl"]);
 }
+
+fn right_click(h: &mut Harness<'_, SlideApp>, pos: egui::Pos2) {
+    h.event(egui::Event::PointerMoved(pos));
+    for pressed in [true, false] {
+        h.event(egui::Event::PointerButton { pos, button: egui::PointerButton::Secondary, pressed, modifiers: egui::Modifiers::default() });
+    }
+    h.run_steps(3);
+}
+
+/// The notes pane's right-click menu corrects a word and deletes a repeated one; the Language
+/// dialog marks text and Do Not Check Spelling clears its squiggles.
+#[test]
+fn notes_menu_language_dialog_and_repeated_words() {
+    use egui::accesskit::Role;
+    let aff = "SET UTF-8\nTRY esianrtolcdugmphbyfvkwzxjq\n";
+    let dic = "6\nthe\nplan\nremember\nis\ngood\nwork\n";
+    deckcraft_engine::spell::install("xx-NM", deckcraft_engine::spell::Dictionary::parse(aff.as_bytes(), dic.as_bytes()));
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.session.execute("slide.layout", &json!({"layout": "blank"})).ok();
+    let id = app
+        .session
+        .execute("shape.insert", &json!({"preset": "rect", "rect": [80, 120, 700, 160], "text": "the plan is is good wrok"}))
+        .unwrap()["id"]
+        .as_u64()
+        .unwrap();
+    app.session.execute("format.size", &json!({"size": 40})).unwrap();
+    app.session.execute("format.language", &json!({"lang": "xx-NM"})).unwrap();
+    let lang = deckcraft_model::RunProps { lang: Some("xx-NM".into()), ..Default::default() };
+    app.session
+        .edit(|doc, _| {
+            std::sync::Arc::make_mut(&mut doc.slides[0]).notes = deckcraft_model::TextBody {
+                paragraphs: vec![deckcraft_model::Paragraph {
+                    runs: vec![deckcraft_model::Run::with("Remmeber the the plan", lang.clone())],
+                    ..Default::default()
+                }],
+                ..Default::default()
+            };
+            Ok(())
+        })
+        .unwrap();
+    let st = app.session.active().unwrap().clone();
+    // "is is" is flagged as repeated, "wrok" as misspelt.
+    assert_eq!(app.squiggles.settle(&st).len(), 2);
+    let mut h = Harness::builder().with_size(egui::vec2(1100.0, 760.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(8);
+    if let (Ok(path), Ok(img)) = (std::env::var("DECKCRAFT_PNG_OUT_NOTES"), h.render()) {
+        let _ = img.save(path);
+    }
+    // Right-click the notes' first word.
+    let notes = h.query_all_by_role(Role::MultilineTextInput).next().map(|n| n.rect()).unwrap();
+    right_click(&mut h, egui::pos2(notes.left() + 14.0, notes.top() + 8.0));
+    if let (Ok(path), Ok(img)) = (std::env::var("DECKCRAFT_PNG_OUT_NOTES_MENU"), h.render()) {
+        let _ = img.save(path);
+    }
+    assert_eq!(h.state().squiggles.notes_menu.as_ref().map(|w| w.word.as_str()), Some("Remmeber"));
+    h.get_by_label("Remember").click();
+    h.run_steps(3);
+    let notes_text = |h: &Harness<'_, SlideApp>| h.state().session.active().unwrap().doc.slides[0].notes_text();
+    assert_eq!(notes_text(&h), "Remember the the plan");
+    // The repeated "the": its squiggle starts after "Remember the ".
+    h.run_steps(4);
+    let x = h.query_all_by_role(Role::MultilineTextInput).next().map(|n| n.rect()).unwrap();
+    let mut found = false;
+    for dx in (60..160).step_by(6) {
+        right_click(&mut h, egui::pos2(x.left() + dx as f32, x.top() + 8.0));
+        if h.state().squiggles.notes_menu.as_ref().is_some_and(|w| w.delete_from.is_some()) {
+            found = true;
+            break;
+        }
+        h.event(egui::Event::Key { key: egui::Key::Escape, physical_key: None, pressed: true, repeat: false, modifiers: Default::default() });
+        h.run_steps(2);
+    }
+    assert!(found, "no repeated word menu in the notes");
+    h.get_by_label("Delete Repeated Word").click();
+    h.run_steps(3);
+    assert_eq!(notes_text(&h), "Remember the plan");
+    // Language dialog: Do Not Check Spelling on the shape clears its squiggles.
+    h.state_mut().session.execute("edit.select", &json!({"ids": [id]})).unwrap();
+    h.state_mut().dialog = Some(crate::dialogs::Dialog::new("language"));
+    h.run_steps(4);
+    if let (Ok(path), Ok(img)) = (std::env::var("DECKCRAFT_PNG_OUT_LANG"), h.render()) {
+        let _ = img.save(path);
+    }
+    assert_eq!(crate::dialogs::selected_language(h.state()).0, "xx-NM");
+    h.get_by_label("Do not check spelling or grammar").click();
+    h.run_steps(2);
+    h.get_by_label("OK").click();
+    h.run_steps(3);
+    assert_eq!(crate::dialogs::selected_language(h.state()), ("xx-NM".to_string(), true));
+    let st = h.state().session.active().unwrap().clone();
+    assert!(h.state_mut().squiggles.settle(&st).is_empty(), "nothing in text marked Do Not Check is flagged, repeats included");
+}
diff --git a/crates/ui-egui/src/squiggles.rs b/crates/ui-egui/src/squiggles.rs
index ce9f6480..8cd42665 100644
--- a/crates/ui-egui/src/squiggles.rs
+++ b/crates/ui-egui/src/squiggles.rs
@@ -195,6 +195,8 @@ pub struct Squiggles {
     pub disabled: bool,
     /// The misspelt word a context menu is open on.
     pub menu_word: Option<MenuWord>,
+    /// The same for the notes pane (`Tag::Notes`, `start` in the line).
+    pub notes_menu: Option<MenuWord>,
     /// Words skipped with Ignore All this session (lower-case).
     ignored: Vec<String>,
 }
@@ -206,6 +208,55 @@ pub struct MenuWord {
     pub start: usize,
     pub word: String,
     pub suggestions: Vec<String>,
+    /// A repeated word: Delete Repeated Word removes characters `from..start + word`.
+    pub delete_from: Option<usize>,
+}
+
+/// Proofing languages offered by Review › Language: (name, tag).
+pub const LANGS: &[(&str, &str)] = &[
+    ("English (United States)", "en-US"),
+    ("English (United Kingdom)", "en-GB"),
+    ("English (Australia)", "en-AU"),
+    ("English (Canada)", "en-CA"),
+    ("Español (España)", "es-ES"),
+    ("Español (México)", "es-MX"),
+    ("Français (France)", "fr-FR"),
+    ("Français (Canada)", "fr-CA"),
+    ("Deutsch (Deutschland)", "de-DE"),
+    ("Deutsch (Schweiz)", "de-CH"),
+    ("Italiano", "it-IT"),
+    ("Nederlands", "nl-NL"),
+    ("Português (Brasil)", "pt-BR"),
+    ("Português (Portugal)", "pt-PT"),
+    ("Polski", "pl-PL"),
+    ("Svenska", "sv-SE"),
+    ("Dansk", "da-DK"),
+    ("Norsk bokmål", "nb-NO"),
+    ("Suomi", "fi-FI"),
+    ("Čeština", "cs-CZ"),
+    ("Українська", "uk-UA"),
+    ("Русский", "ru-RU"),
+    ("Беларуская", "be-BY"),
+    ("Türkçe", "tr-TR"),
+    ("Ελληνικά", "el-GR"),
+    ("日本語", "ja-JP"),
+    ("中文(中国)", "zh-CN"),
+    ("한국어", "ko-KR"),
+    ("العربية", "ar-SA"),
+    ("עברית", "he-IL"),
+];
+
+/// The display name of a language tag (the tag itself when it isn't in [`LANGS`]).
+pub fn lang_name(tag: &str) -> String {
+    LANGS.iter().find(|(_, t)| t.eq_ignore_ascii_case(tag)).map_or_else(|| tag.to_string(), |(n, _)| n.to_string())
+}
+
+/// The flagged word (misspelt or repeated) of `pp` starting at `start`, with what the menu offers.
+pub fn menu_word(pp: &Paragraph, default: &str, tag: Tag, start: usize) -> Option<MenuWord> {
+    let w = deckcraft_engine::spell::misspelt(pp, default, &[]).into_iter().find(|w| w.start == start)?;
+    let suggestions =
+        if w.repeated.is_some() { vec![] } else { deckcraft_engine::spell::dictionary(&w.lang).map(|d| d.suggest(&w.text, 5)).unwrap_or_default() };
+    Some(MenuWord { tag, start, word: w.text, suggestions, delete_from: w.repeated })
 }
 
 fn slot(k: Kind) -> usize {
@@ -387,11 +438,8 @@ impl Squiggles {
             // From the line's top (a word is about a line high above its underline) to just below it.
             p.x >= x0 - tol && p.x <= x1 + tol && p.y <= a.y.max(b.y) + tol && p.y >= a.y.min(b.y) - 24.0
         })?;
-        let pp = paragraph_of(st, tag)?;
-        let word: String = pp.text().chars().skip(start).take(end - start).collect();
-        let lang = deckcraft_engine::spell::paragraph_words(&pp, &default_lang(st)).into_iter().find(|w| w.start == start).map(|w| w.lang)?;
-        let suggestions = deckcraft_engine::spell::dictionary(&lang).map(|d| d.suggest(&word, 5)).unwrap_or_default();
-        Some(MenuWord { tag, start, word, suggestions })
+        let _ = end;
+        menu_word(&paragraph_of(st, tag)?, &default_lang(st), tag, start)
     }
 
     /// Wait (tests) until the slide's check for `st` is in.
diff --git a/crates/ui-egui/src/status.rs b/crates/ui-egui/src/status.rs
index 65ec8bc9..bcc29594 100644
--- a/crates/ui-egui/src/status.rs
+++ b/crates/ui-egui/src/status.rs
@@ -20,7 +20,13 @@ pub fn status_bar(app: &mut SlideApp, ui: &mut Ui) {
         };
         let p = ui.painter();
         p.text(pos2(rect.min.x + 14.0, rect.center().y), Align2::LEFT_CENTER, &left, theme::font(12.0), t.text_dim);
-        p.text(pos2(rect.min.x + 120.0, rect.center().y), Align2::LEFT_CENTER, "English (United States)", theme::font(12.0), t.text_dim);
+        // The selection's proofing language; a click opens Review › Language.
+        let (lang, no_proof) = crate::dialogs::selected_language(app);
+        let name = crate::squiggles::lang_name(&lang) + if no_proof { " (not checked)" } else { "" };
+        let lr = p.text(pos2(rect.min.x + 120.0, rect.center().y), Align2::LEFT_CENTER, &name, theme::font(12.0), t.text_dim);
+        if ui.interact(lr.expand(3.0), ui.id().with("status_lang"), Sense::click()).on_hover_text("Language").clicked() {
+            app.dialog = Some(crate::dialogs::Dialog::new("language"));
+        }
         // Transient status message.
         if let Some((msg, at)) = app.status.clone() {
             if crate::now_ms() - at < 6000.0 {
@@ -171,6 +177,69 @@ pub fn notes_pane(app: &mut SlideApp, ui: &mut Ui) {
                     crate::squiggles::paint(ui.painter(), egui::pos2(ra.left(), y) + o, egui::pos2(rb.left(), y) + o, 1.0);
                 }
             }
+            // Right-click on a flagged word: its corrections, Ignore All, Add to Dictionary.
+            if r.secondary_clicked()
+                && let Some(pos) = r.interact_pointer_pos()
+            {
+                let at = out.galley.cursor_from_pos(pos - out.galley_pos).index.0;
+                let hit = app.squiggles.notes(&buf, &lang, None, None).into_iter().find(|(a, b)| at >= *a && at <= *b);
+                app.squiggles.notes_menu = hit.and_then(|(a, _)| {
+                    let before: String = buf.chars().take(a).collect();
+                    let line_start = before.rfind('\n').map_or(0, |i| before[..i].chars().count() + 1);
+                    let line = buf.chars().skip(line_start).take_while(|c| *c != '\n').collect::<String>();
+                    crate::squiggles::menu_word(
+                        &deckcraft_model::Paragraph::new(&line),
+                        &lang,
+                        crate::squiggles::Tag::Notes { start: line_start },
+                        a - line_start,
+                    )
+                });
+            }
+            let mut changed: Option<String> = None;
+            if app.squiggles.notes_menu.is_some() {
+                r.context_menu(|ui| {
+                    let Some(w) = app.squiggles.notes_menu.clone() else { return };
+                    let crate::squiggles::Tag::Notes { start: ls } = w.tag else { return };
+                    let chars: Vec<char> = buf.chars().collect();
+                    let end = ls + w.start + w.word.chars().count();
+                    let splice = |from: usize, to: &str| -> String {
+                        chars[..from.min(chars.len())]
+                            .iter()
+                            .chain(to.chars().collect::<Vec<_>>().iter())
+                            .chain(chars[end.min(chars.len())..].iter())
+                            .collect()
+                    };
+                    if let Some(from) = w.delete_from {
+                        if ui.button(egui::RichText::new("Delete Repeated Word").strong()).clicked() {
+                            changed = Some(splice(ls + from, ""));
+                            ui.close();
+                        }
+                    } else if w.suggestions.is_empty() {
+                        ui.label(egui::RichText::new("(no spelling suggestions)").weak());
+                    }
+                    for to in &w.suggestions {
+                        if ui.button(egui::RichText::new(to).strong()).clicked() {
+                            changed = Some(splice(ls + w.start, to));
+                            ui.close();
+                        }
+                    }
+                    if ui.button("Ignore All").clicked() {
+                        app.squiggles.ignore(&w.word);
+                        ui.close();
+                    }
+                    if w.delete_from.is_none() && ui.button("Add to Dictionary").clicked() {
+                        if let Err(e) = app.session.execute("review.addToDictionary", &json!({"word": w.word})) {
+                            app.set_status(e.to_string());
+                        }
+                        ui.close();
+                    }
+                });
+            }
+            if let Some(new) = changed {
+                buf = new;
+                app.squiggles.notes_menu = None;
+                let _ = app.run("slide.notes", json!({"text": buf, "index": idx}));
+            }
             app.notes_buf.2 = buf.clone();
             if r.lost_focus() && buf != current {
                 let _ = app.run("slide.notes", json!({"text": buf, "index": idx}));
diff --git a/docs/gaps.md b/docs/gaps.md
index 8363d892..325fde0a 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -179,12 +179,14 @@ Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a *
   (`crates/engine/src/spell.rs`: affixes, cross products, one level of continuation, compounds,
   case rules, suggestions), each run in its own language (`lang` from PPTX), with a user dictionary
   for Add to Dictionary. Red squiggles on the current slide come from a worker thread, with a
-  context menu to correct, ignore or add; table cells and speaker notes are squiggled too (the
-  notes have no context menu yet), and the web build checks on the UI thread a few milliseconds per
+  context menu to correct, ignore or add; table cells and speaker notes are squiggled too, each
+  with a right-click menu; repeated words (`the the`) are flagged with Delete Repeated Word;
+  Review › Language marks the selection's proofing language or Do Not Check Spelling
+  (`lang`/`noProof` round-trip in PPTX). No grammar checking. The web build checks on the UI thread a few milliseconds per
   frame. None ship with DeckCraft, so without one installed (always on Windows and the web) only a
   short list of common misspellings is found.
   Thesaurus (#549) and AutoCorrect (#521) have open PRs.
-- **Estimate:** 1–3 h (bundle openly licensed dictionaries; a notes context menu).
+- **Estimate:** 1–2 h (bundle openly licensed dictionaries).
 
 ### Equations
 - **Evidence:** checklist row missing; PR #55 (OMML editor, +10.5k lines) is open.
@@ -263,6 +265,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Notes spelling menu, Review › Language with Do Not Check Spelling, repeated words |
 | 2026-10-14 | trivial | Spelling squiggles in table cells and notes, and on the web |
 | 2026-10-14 | minor | Spelling squiggles while typing, Add to Dictionary, per-run languages and compounds |
 | 2026-10-14 | minor | Spelling checks with installed Hunspell dictionaries and suggests corrections |

From 5fc8aaee7c1abf5edc2b07ea481af33864d63a06 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:47:47 +0300
Subject: [PATCH 241/376] Metafile: EMF+ cardinal curves and region fills
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

DrawCurve, DrawClosedCurve and FillClosedCurve (GDI+ cardinal splines, the
smoothed lines of charts and freehand shapes) draw as cubic Béziers with
the record's tension, offset and segment count; FillRegion fills the region
object's area. These records were skipped, so the shapes were missing.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/metafile/src/emfplus.rs | 65 ++++++++++++++++++++++++++++++++++
 crates/metafile/src/tests.rs   | 60 +++++++++++++++++++++++++++++++
 crates/render/src/tests.rs     | 15 ++++++++
 3 files changed, 140 insertions(+)

diff --git a/crates/metafile/src/emfplus.rs b/crates/metafile/src/emfplus.rs
index 48d1af89..064ce609 100644
--- a/crates/metafile/src/emfplus.rs
+++ b/crates/metafile/src/emfplus.rs
@@ -328,6 +328,39 @@ impl Plus {
                 self.painter().stroke(cv, &ops, pen);
                 Some(())
             }
+            // Cardinal splines: FillClosedCurve, DrawClosedCurve, DrawCurve.
+            0x4016 => {
+                let fill = self.brush_of(flags, r.u32(0)?)?;
+                let tension = finite(r.f32(4)?)?;
+                let pts = points(r, 12, r.u32(8)? as usize, compressed)?;
+                self.painter().fill(cv, &curve_ops(&pts, tension, true, 0, usize::MAX), &fill);
+                Some(())
+            }
+            0x4017 => {
+                let pen = self.pen(id)?;
+                let tension = finite(r.f32(0)?)?;
+                let pts = points(r, 8, r.u32(4)? as usize, compressed)?;
+                self.painter().stroke(cv, &curve_ops(&pts, tension, true, 0, usize::MAX), pen);
+                Some(())
+            }
+            0x4018 => {
+                let pen = self.pen(id)?;
+                let tension = finite(r.f32(0)?)?;
+                let (offset, segments) = (r.u32(4)? as usize, r.u32(8)? as usize);
+                let pts = points(r, 16, r.u32(12)? as usize, compressed)?;
+                self.painter().stroke(cv, &curve_ops(&pts, tension, false, offset, segments), pen);
+                Some(())
+            }
+            // FillRegion: the region's area (as the clip reads it).
+            0x4013 => {
+                let fill = self.brush_of(flags, r.u32(0)?)?;
+                let Some(Some(Obj::Region(Some(area)))) = self.objects.get(id).cloned() else { return None };
+                if area.len() < 3 {
+                    return None;
+                }
+                self.painter().fill(cv, &poly_ops(&area, true), &fill);
+                Some(())
+            }
             0x401A => {
                 let img = self.image(id)?;
                 let dst = *rects(r, 24, 1, compressed)?.first()?;
@@ -1246,6 +1279,38 @@ fn rect_ops([l, t, r, b]: [f64; 4]) -> Vec<Op> {
     crate::geom::rect(l, t, r, b)
 }
 
+fn finite(v: f32) -> Option<f64> {
+    v.is_finite().then_some(f64::from(v))
+}
+
+/// A GDI+ cardinal spline through `pts` as cubic Béziers: each segment's control points lie a
+/// third of `tension` (GDI+'s default 0.5) along the neighbouring chords. `closed` joins the
+/// last point back to the first; an open curve draws `segments` segments from point `offset`.
+fn curve_ops(pts: &[P], tension: f64, closed: bool, offset: usize, segments: usize) -> Vec<Op> {
+    let n = pts.len();
+    if n < 2 {
+        return Vec::new();
+    }
+    let k = tension.clamp(0.0, 10.0) / 3.0;
+    let at = |i: isize| -> P {
+        let i = if closed { i.rem_euclid(n as isize) as usize } else { i.clamp(0, n as isize - 1) as usize };
+        pts.get(i).copied().unwrap_or((0.0, 0.0))
+    };
+    let (first, count) = if closed { (0, n) } else { (offset.min(n - 1), segments.min(n - 1 - offset.min(n - 1))) };
+    let mut ops = vec![Op::M(at(first as isize))];
+    for s in first..first + count {
+        let i = s as isize;
+        let (p0, p1, p2, p3) = (at(i - 1), at(i), at(i + 1), at(i + 2));
+        let c1 = (p1.0 + (p2.0 - p0.0) * k, p1.1 + (p2.1 - p0.1) * k);
+        let c2 = (p2.0 - (p3.0 - p1.0) * k, p2.1 - (p3.1 - p1.1) * k);
+        ops.push(Op::C(c1, c2, p2));
+    }
+    if closed {
+        ops.push(Op::Z);
+    }
+    ops
+}
+
 fn poly_ops(pts: &[P], close: bool) -> Vec<Op> {
     let mut ops: Vec<Op> = pts.iter().enumerate().map(|(i, p)| if i == 0 { Op::M(*p) } else { Op::L(*p) }).collect();
     if close {
diff --git a/crates/metafile/src/tests.rs b/crates/metafile/src/tests.rs
index 7ad5071b..43789e3d 100644
--- a/crates/metafile/src/tests.rs
+++ b/crates/metafile/src/tests.rs
@@ -1849,3 +1849,63 @@ fn emfplus_nested_metafile_image_draws_its_items_into_the_destination() {
     assert_eq!(fill, Some([255, 255, 255, 255]));
     assert!(segs.contains(&Seg::Line(40.0, 20.0)), "{segs:?}");
 }
+
+/// Curves and a region fill, as an EMF+ only file (also written to `$DECKCRAFT_EMF_OUT` to look at).
+fn curves_file() -> Vec<u8> {
+    let pen = prec(0x4008, 0x0200 | 1, &solid_pen(0xFF20_60C0, 3.0));
+    // A closed curve through a diamond's corners, filled orange.
+    let diamond = f32s(&[100.0, 10.0, 190.0, 100.0, 100.0, 190.0, 10.0, 100.0]);
+    let fill = prec(0x4016, 0x8000, &cat(vec![h32(0xFFE0_8020), f32s(&[0.5]), h32(4), diamond.clone()]));
+    let outline = prec(0x4017, 1, &cat(vec![f32s(&[0.5]), h32(4), diamond]));
+    // An open curve (a smoothed line chart): all four segments of five points.
+    let line =
+        prec(0x4018, 1, &cat(vec![f32s(&[0.5]), h32(0), h32(4), h32(5), f32s(&[210.0, 150.0, 260.0, 60.0, 310.0, 120.0, 360.0, 30.0, 410.0, 90.0])]));
+    // A green rectangle region, filled.
+    let region = cat(vec![h32(0xDBC0_1002), h32(0), h32(0x1000_0000), f32s(&[220.0, 160.0, 180.0, 30.0])]);
+    let fill_region = prec(0x4013, 0x8000 | 2, &h32(0xFF30_A040));
+    let mut all = vec![plus_header(false), pen, fill, outline, line, prec(0x4008, 0x0400 | 2, &region), fill_region];
+    all.push(prec(0x4002, 0, &[]));
+    emf(&[plus_comment(&all)], [0, 0, 420, 200], [0; 4])
+}
+
+#[test]
+fn emfplus_cardinal_curves_and_region_fill() {
+    let bytes = curves_file();
+    if let Ok(path) = std::env::var("DECKCRAFT_EMF_OUT") {
+        let _ = std::fs::write(path, &bytes);
+    }
+    let p = parse(&bytes).unwrap();
+    assert_eq!(p.items.len(), 4, "{:?}", p.items.len());
+    // The closed curve: four cubics through the diamond's corners, closed.
+    let (segs, fill, ..) = path_segs(&p.items[0]);
+    assert_eq!(fill, Some([0xE0, 0x80, 0x20, 0xFF]));
+    let cubics: Vec<(f32, f32)> = segs.iter().filter_map(|s| if let Seg::Cubic(.., x, y) = s { Some((*x, *y)) } else { None }).collect();
+    assert_eq!(cubics.len(), 4, "{segs:?}");
+    assert_eq!(segs.last(), Some(&Seg::Close));
+    // The open curve: four cubics and no close; its controls bulge past the straight chords.
+    let (segs, fill, stroke, _) = path_segs(&p.items[2]);
+    assert_eq!((fill, stroke.map(|s| s.0)), (None, Some([0x20, 0x60, 0xC0, 0xFF])));
+    assert_eq!(segs.iter().filter(|s| matches!(s, Seg::Cubic(..))).count(), 4);
+    assert!(!segs.contains(&Seg::Close));
+    // The region fill is its rectangle.
+    let (segs, fill, ..) = path_segs(&p.items[3]);
+    assert_eq!(fill, Some([0x30, 0xA0, 0x40, 0xFF]));
+    assert_eq!(segs.iter().filter(|s| matches!(s, Seg::Line(..))).count(), 3, "{segs:?}");
+}
+
+#[test]
+fn emfplus_curve_offsets_and_degenerate_input_are_safe() {
+    let pen = prec(0x4008, 0x0200 | 1, &solid_pen(0xFF00_0000, 1.0));
+    // Segments from point 2 of 5, asking for more than there are: two segments.
+    let line = prec(0x4018, 1, &cat(vec![f32s(&[0.5]), h32(2), h32(99), h32(5), f32s(&[0.0, 0.0, 10.0, 5.0, 20.0, 0.0, 30.0, 5.0, 40.0, 0.0])]));
+    let p = plus_pic(vec![pen.clone(), line]);
+    let (segs, ..) = path_segs(&p.items[0]);
+    assert_eq!(segs.iter().filter(|s| matches!(s, Seg::Cubic(..))).count(), 2, "{segs:?}");
+    // One point, an offset past the end, a NaN tension, a missing region: nothing, no panic.
+    let one = prec(0x4018, 1, &cat(vec![f32s(&[0.5]), h32(0), h32(1), h32(1), f32s(&[1.0, 1.0])]));
+    let past = prec(0x4018, 1, &cat(vec![f32s(&[0.5]), h32(9), h32(9), h32(2), f32s(&[0.0, 0.0, 9.0, 9.0])]));
+    let nan = prec(0x4017, 1, &cat(vec![f32s(&[f32::NAN]), h32(3), f32s(&[0.0, 0.0, 9.0, 9.0, 0.0, 9.0])]));
+    let no_region = prec(0x4013, 0x8000 | 7, &h32(0xFF00_0000));
+    let p = plus_pic(vec![pen, one, past, nan, no_region]);
+    assert!(p.items.iter().all(|i| path_segs(i).0.iter().filter(|s| matches!(s, Seg::Cubic(..))).count() == 0));
+}
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..40bb76c1 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1711,3 +1711,18 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
     let (w, h) = ink(deckcraft_model::text::TextDir::Vertical);
     assert!(h > w * 3, "vert: stroke on its side {w}x{h}");
 }
+
+/// Renders the EMF at `$DECKCRAFT_EMF_IN` to `$DECKCRAFT_EMF_PNG` (a look-at helper; does nothing
+/// without them).
+#[test]
+fn render_an_emf_file_to_look_at() {
+    let (Ok(src), Ok(out)) = (std::env::var("DECKCRAFT_EMF_IN"), std::env::var("DECKCRAFT_EMF_PNG")) else { return };
+    let Ok(bytes) = std::fs::read(&src) else { return };
+    let mut p = Presentation::default();
+    let media = p.add_media("image1.emf", "image/x-emf", bytes);
+    let fill = deckcraft_model::style::PictureFill { media, ..Default::default() };
+    let sh = Shape { id: ShapeId(600), xfrm: Some(Xfrm::new(40.0, 40.0, 840.0, 400.0)), kind: ShapeKind::Picture { fill }, ..Default::default() };
+    std::sync::Arc::make_mut(&mut p.slides[0]).shapes = vec![sh];
+    let img = render_slide(&p, 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    let _ = std::fs::write(out, img.to_png());
+}

From fea8c1498f60d209c77c8bb466511bb356cb7a90 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:52:57 +0300
Subject: [PATCH 242/376] Metafile: EMF+ Clear, and the EMF+ record coverage
 written down

EmfPlusClear paints the whole picture frame in its colour, ignoring the
world transform and clip, as GDI+ does; a transparent clear draws nothing.
With it every drawing record of MS-EMFPLUS 2.3.4 is played. The module docs
list what is deliberately ignored (rendering hints, rendering origin,
serializable image effects, terminal-server records, and StrokeFillPath,
which the specification names but gives no layout for), and the parity docs
no longer say EMF+ isn't drawn.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/metafile/src/emf.rs     |  1 +
 crates/metafile/src/emfplus.rs | 40 ++++++++++++++++++++++++++++++----
 crates/metafile/src/tests.rs   | 39 ++++++++++++++++++++++++++++-----
 docs/file-format-parity.md     |  2 +-
 docs/gaps.md                   |  3 ++-
 5 files changed, 74 insertions(+), 11 deletions(-)

diff --git a/crates/metafile/src/emf.rs b/crates/metafile/src/emf.rs
index 21ad9b62..6190237e 100644
--- a/crates/metafile/src/emf.rs
+++ b/crates/metafile/src/emf.rs
@@ -43,6 +43,7 @@ pub(crate) fn parse(input: Bytes) -> Result<(Canvas, Option<Frame>), Error> {
         cv.set_device_mm(px_mm);
     }
     let mut plus = crate::emfplus::Plus::new();
+    plus.frame = frame.as_ref().map(|f| f.rect);
     let mut parsed = 0usize;
     let mut pos = hsize.max(88);
     while !cv.full() {
diff --git a/crates/metafile/src/emfplus.rs b/crates/metafile/src/emfplus.rs
index 064ce609..ce10447e 100644
--- a/crates/metafile/src/emfplus.rs
+++ b/crates/metafile/src/emfplus.rs
@@ -11,10 +11,17 @@
 //! - world and page transforms, save/restore and containers;
 //! - arcs and pies;
 //! - clipping to rectangles and convex clip paths and regions (others: their bounding rectangle);
-//! - nested metafile images, and glyph-index driver strings in the Windows core fonts.
+//! - nested metafile images, and glyph-index driver strings in the Windows core fonts;
+//! - cardinal splines (DrawCurve, DrawClosedCurve, FillClosedCurve), FillRegion, and Clear
+//!   (over the picture frame).
 //!
-//! Not drawn yet: image attributes, glyph indices of other fonts, and region combinations other
-//! than intersect and union (XOR, exclude and complement keep the left area).
+//! Every drawing record of MS-EMFPLUS §2.3.4 is played. Not drawn: image attributes, glyph
+//! indices of other fonts, and region combinations other than intersect and union (XOR, exclude
+//! and complement keep the left area). Deliberately ignored: rendering hints (antialias, text
+//! hint, interpolation, pixel offset, compositing; the renderer has its own), SetRenderingOrigin
+//! (hatch phase), SerializableObject image effects, the terminal-server records SetTSGraphics and
+//! SetTSClip, and StrokeFillPath (0x4037), which the specification lists but gives no layout for
+//! and GDI+ doesn't write.
 
 use std::sync::Arc;
 
@@ -217,11 +224,23 @@ pub(crate) struct Plus {
     objects: Vec<Option<Obj>>,
     stack: Vec<Saved>,
     partial: Option<Partial>,
+    /// The picture frame in device units (`[x, y, w, h]`), what Clear paints.
+    pub frame: Option<[f64; 4]>,
 }
 
 impl Plus {
     pub fn new() -> Self {
-        Plus { active: false, dpi: 96.0, world: IDENTITY, page: 1.0, clip: None, objects: vec![None; MAX_OBJECTS], stack: Vec::new(), partial: None }
+        Plus {
+            active: false,
+            dpi: 96.0,
+            world: IDENTITY,
+            page: 1.0,
+            clip: None,
+            objects: vec![None; MAX_OBJECTS],
+            stack: Vec::new(),
+            partial: None,
+            frame: None,
+        }
     }
 
     /// Plays the EMF+ records of one EMR_COMMENT payload (after the identifier).
@@ -351,6 +370,19 @@ impl Plus {
                 self.painter().stroke(cv, &curve_ops(&pts, tension, false, offset, segments), pen);
                 Some(())
             }
+            // Clear: the whole picture in one colour, whatever the clip (a transparent clear
+            // leaves nothing to draw).
+            0x4009 => {
+                let c = argb(r.u32(0)?);
+                let [x, y, w, h] = self.frame?;
+                if c[3] == 0 || !(w > 0.0 && h > 0.0) {
+                    return Some(());
+                }
+                let to_device = invert(mul(cv.world(), cv.device_affine()))?;
+                let p = Painter { xf: to_device, clip: None };
+                p.fill(cv, &rect_ops([x, y, x + w, y + h]), &Fill::Solid(c));
+                Some(())
+            }
             // FillRegion: the region's area (as the clip reads it).
             0x4013 => {
                 let fill = self.brush_of(flags, r.u32(0)?)?;
diff --git a/crates/metafile/src/tests.rs b/crates/metafile/src/tests.rs
index 43789e3d..80d41117 100644
--- a/crates/metafile/src/tests.rs
+++ b/crates/metafile/src/tests.rs
@@ -1863,7 +1863,9 @@ fn curves_file() -> Vec<u8> {
     // A green rectangle region, filled.
     let region = cat(vec![h32(0xDBC0_1002), h32(0), h32(0x1000_0000), f32s(&[220.0, 160.0, 180.0, 30.0])]);
     let fill_region = prec(0x4013, 0x8000 | 2, &h32(0xFF30_A040));
-    let mut all = vec![plus_header(false), pen, fill, outline, line, prec(0x4008, 0x0400 | 2, &region), fill_region];
+    // A cream background first.
+    let clear = prec(0x4009, 0, &h32(0xFFF4_EED8));
+    let mut all = vec![plus_header(false), clear, pen, fill, outline, line, prec(0x4008, 0x0400 | 2, &region), fill_region];
     all.push(prec(0x4002, 0, &[]));
     emf(&[plus_comment(&all)], [0, 0, 420, 200], [0; 4])
 }
@@ -1875,20 +1877,21 @@ fn emfplus_cardinal_curves_and_region_fill() {
         let _ = std::fs::write(path, &bytes);
     }
     let p = parse(&bytes).unwrap();
-    assert_eq!(p.items.len(), 4, "{:?}", p.items.len());
+    assert_eq!(p.items.len(), 5, "{:?}", p.items.len());
+    assert_eq!(path_segs(&p.items[0]).1, Some([0xF4, 0xEE, 0xD8, 0xFF]), "the clear comes first");
     // The closed curve: four cubics through the diamond's corners, closed.
-    let (segs, fill, ..) = path_segs(&p.items[0]);
+    let (segs, fill, ..) = path_segs(&p.items[1]);
     assert_eq!(fill, Some([0xE0, 0x80, 0x20, 0xFF]));
     let cubics: Vec<(f32, f32)> = segs.iter().filter_map(|s| if let Seg::Cubic(.., x, y) = s { Some((*x, *y)) } else { None }).collect();
     assert_eq!(cubics.len(), 4, "{segs:?}");
     assert_eq!(segs.last(), Some(&Seg::Close));
     // The open curve: four cubics and no close; its controls bulge past the straight chords.
-    let (segs, fill, stroke, _) = path_segs(&p.items[2]);
+    let (segs, fill, stroke, _) = path_segs(&p.items[3]);
     assert_eq!((fill, stroke.map(|s| s.0)), (None, Some([0x20, 0x60, 0xC0, 0xFF])));
     assert_eq!(segs.iter().filter(|s| matches!(s, Seg::Cubic(..))).count(), 4);
     assert!(!segs.contains(&Seg::Close));
     // The region fill is its rectangle.
-    let (segs, fill, ..) = path_segs(&p.items[3]);
+    let (segs, fill, ..) = path_segs(&p.items[4]);
     assert_eq!(fill, Some([0x30, 0xA0, 0x40, 0xFF]));
     assert_eq!(segs.iter().filter(|s| matches!(s, Seg::Line(..))).count(), 3, "{segs:?}");
 }
@@ -1909,3 +1912,29 @@ fn emfplus_curve_offsets_and_degenerate_input_are_safe() {
     let p = plus_pic(vec![pen, one, past, nan, no_region]);
     assert!(p.items.iter().all(|i| path_segs(i).0.iter().filter(|s| matches!(s, Seg::Cubic(..))).count() == 0));
 }
+
+#[test]
+fn emfplus_clear_paints_the_whole_frame_and_transparent_clears_nothing() {
+    let dot = prec(0x400A, 0x8000, &cat(vec![h32(0xFF00_0000), h32(1), f32s(&[40.0, 40.0, 10.0, 10.0])]));
+    let clear = |argb: u32| prec(0x4009, 0, &h32(argb));
+    // 100 × 50 device units (0..2500 × 0..1250 hundredths of a millimetre at 0.04 units each).
+    let file = |recs: Vec<Vec<u8>>| {
+        let mut all = vec![plus_header(false)];
+        all.extend(recs);
+        parse(&emf(&[plus_comment(&all)], [0, 0, 99, 49], [0, 0, 2500, 1250])).unwrap()
+    };
+    // A translated, clipped world doesn't move or cut the clear.
+    let shift = prec(0x402D, 0, &f32s(&[30.0, 30.0]));
+    let clip = prec(0x4032, 0, &f32s(&[0.0, 0.0, 5.0, 5.0]));
+    let p = file(vec![shift, clip, clear(0xFFFF_FFFF), prec(0x4031, 0, &[]), dot.clone()]);
+    assert_eq!(p.items.len(), 2);
+    let (segs, fill, ..) = path_segs(&p.items[0]);
+    assert_eq!(fill, Some([255, 255, 255, 255]));
+    let xs: Vec<f32> = segs.iter().filter_map(|s| if let Seg::Move(x, _) | Seg::Line(x, _) = s { Some(*x) } else { None }).collect();
+    let span = xs.iter().cloned().fold(f32::MIN, f32::max) - xs.iter().cloned().fold(f32::MAX, f32::min);
+    assert!((span - p.width).abs() < 0.5, "clear spans {span} of {}", p.width);
+    // Transparent: only the dot.
+    assert_eq!(file(vec![clear(0x00FF_FFFF), dot.clone()]).items.len(), 1);
+    // No frame: nothing to clear.
+    assert_eq!(plus_pic(vec![clear(0xFFFF_FFFF), dot]).items.len(), 1);
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..bff4d745 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -38,7 +38,7 @@ PowerPoint opens and saves; Viewer = opens only).
 |---|---|---|---|
 | PNG, JPEG, GIF (animated), BMP, TIFF, WebP | yes | yes | `image` 0.25; animated GIFs play since #39 |
 | SVG | yes (with PNG fallback) | **no** | The PNG fallback shows; SVG files can't be inserted |
-| EMF / WMF | yes | partial | Drawn as vectors (paths, pens, pattern and hatch brushes, bitmaps, text in the document's fonts with the file's character advances); clip regions and EMF+ records are not drawn. Legacy OLE objects (VML preview) and ActiveX controls show their pictures |
+| EMF / WMF | yes | partial | Drawn as vectors (paths, pens, pattern and hatch brushes, bitmaps, text in the document's fonts with the file's character advances); clip regions; EMF+ only pictures play every EMF+ drawing record (brushes incl. gradients and textures, pens, paths, curves, images, strings, transforms, clipping; see `crates/metafile/src/emfplus.rs` for the few exceptions). Legacy OLE objects (VML preview) and ActiveX controls show their pictures |
 | HEIC | yes (macOS) | no | |
 | Audio: MP3, AAC/M4A, ALAC, WAV, AIFF, CAF, FLAC, Ogg Vorbis, Opus | yes (Ogg/Opus partly) | yes | Pure-Rust decoders in `crates/media`, `crates/opus` |
 | WMA | yes (Windows) | embedded, not playable | |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..bec31d56 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -78,7 +78,8 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### SVG pictures don't render
 - **Evidence:** `crates/render/src/images.rs` decodes through `image` 0.25 (PNG, JPEG, WebP, GIF,
   TIFF, BMP), and EMF/WMF through `deckcraft-metafile` (ported from WordCraft: paths, fills, pens,
-  pattern and hatch brushes, bitmaps and text; clip regions and EMF+ records are not drawn).
+  pattern and hatch brushes, bitmaps and text; EMF+ only pictures play their EMF+ records;
+  clip regions are not drawn).
   Nothing reads SVG; PowerPoint's Insert Icons stores SVG with a PNG fallback.
 - **Impact:** SVG icons show only their raster fallback, and SVG files can't be inserted. An
   EMF/WMF that clips its drawing (EXTSELECTCLIPRGN, INTERSECTCLIPRECT) draws past its clip.

From e4022e67025505e732747e8dd5e87a6c7e60357c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 02:59:40 +0300
Subject: [PATCH 243/376] UI: Paragraph dialog sets alignment, indents and
 spacing
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

format.paragraphDialog applies alignment, first-line and hanging
indents, spacing and line spacing in one undo step. With no fields it
opens the dialog from the Home › Paragraph launcher. Tabs… opens a
standalone Tabs dialog and returns to Paragraph.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                                   |   4 +-
 crates/engine/src/cmd/format.rs              | 362 ++++++++++++++++++-
 crates/ui-egui/src/canvas.rs                 |   4 +
 crates/ui-egui/src/dialogs.rs                | 356 +++++++++++++++++-
 crates/ui-egui/src/menus.rs                  |   1 +
 crates/ui-egui/src/paragraph_dialog_tests.rs |  88 +++++
 crates/ui-egui/src/ribbon.rs                 |   5 +-
 docs/architecture.md                         |   7 +-
 docs/gaps.md                                 |  10 +-
 docs/target-app-parity.md                    |   5 +-
 docs/ui-parity.md                            |   9 +-
 11 files changed, 816 insertions(+), 35 deletions(-)
 create mode 100644 crates/ui-egui/src/paragraph_dialog_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 15729ba9..63e7e18e 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Font dialog; previous: minor, hours to ~95% per audience added; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Paragraph dialog; previous: trivial, Font dialog; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Paragraph dialog (Home › Paragraph launcher): alignment, first-line and hanging indents, spacing before and after, line spacing, and a Tabs dialog, each applied in one undo step. Breadth stays 79% |
 | 2026-10-14 | Font dialog (Home › Font, the shape menu, Cmd+T): family, size, bold, italic, underline, colour, strikethrough, baseline, caps and character spacing, applied in one undo step. Breadth stays 79% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
@@ -151,6 +152,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Paragraph dialog |
 | 2026-10-14 | trivial | Progress log: Font dialog |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
diff --git a/crates/engine/src/cmd/format.rs b/crates/engine/src/cmd/format.rs
index f1c3921d..c6dec0e0 100644
--- a/crates/engine/src/cmd/format.rs
+++ b/crates/engine/src/cmd/format.rs
@@ -3,7 +3,7 @@
 
 use deckcraft_model::edit as ed;
 use deckcraft_model::resolve;
-use deckcraft_model::text::{Align, Anchor, AutoFit, Bullet, Caps, ParaProps, RunProps, Spacing, Strike, TextDir};
+use deckcraft_model::text::{Align, Anchor, AutoFit, Bullet, Caps, ParaProps, RunProps, Spacing, Strike, TabStop, TextDir};
 use deckcraft_model::{Effects, Fill, Line, Shape};
 use serde_json::{Value, json};
 
@@ -148,6 +148,24 @@ pub fn specs() -> Vec<CommandSpec> {
             has_text_or_shapes,
             paragraph
         ),
+        cmd!(
+            "format.paragraphDialog",
+            "Paragraph…",
+            ["Home", "Paragraph"],
+            None,
+            "{align?: left|center|right|justify|justLow|distributed, indentLeft?: pt, indentRight?: pt, special?: none|first|hanging, specialBy?: pt, indentFirst?: pt, spaceBefore?: pt, spaceAfter?: pt, spaceBeforeKind?: pts|pct, spaceAfterKind?: pts|pct, lineSpacing?: lines, lineSpacingPt?: pt} — with none of these, opens the Paragraph dialog",
+            has_text_or_shapes,
+            paragraph_dialog
+        ),
+        cmd!(
+            "format.tabs",
+            "Tabs…",
+            ["Home", "Paragraph"],
+            None,
+            "{set?: [{pos: pt, align: l|ctr|r|dec}], defaultTab?: pt} — with neither, opens the Tabs dialog",
+            has_text_or_shapes,
+            tabs
+        ),
         cmd!("format.anchor", "Align Text", ["Home", "Paragraph"], None, "{anchor: top|middle|bottom}", has_text_or_shapes, anchor),
         cmd!(
             "format.direction",
@@ -758,6 +776,229 @@ fn paragraph(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
+const PARA_DIALOG_KEYS: &[&str] =
+    &["align", "indentLeft", "indentRight", "indentFirst", "special", "specialBy", "spaceBefore", "spaceAfter", "lineSpacing", "lineSpacingPt"];
+
+fn para_dialog_has_fields(p: &Value) -> bool {
+    PARA_DIALOG_KEYS.iter().any(|k| p.get(*k).is_some())
+}
+
+fn finite_key(p: &Value, cmd: &str, key: &str) -> Result<Option<f64>> {
+    match p.get(key) {
+        None => Ok(None),
+        Some(v) => {
+            let n = v.as_f64().filter(|n| n.is_finite()).ok_or_else(|| bad(cmd, format!("`{key}` must be a finite number")))?;
+            Ok(Some(n))
+        }
+    }
+}
+
+fn clamp_pt(v: f64) -> f64 {
+    v.clamp(0.0, 1584.0)
+}
+
+fn parse_align(cmd: &str, s: &str) -> Result<Align> {
+    Ok(match s {
+        "left" | "l" => Align::Left,
+        "center" | "ctr" => Align::Center,
+        "right" | "r" => Align::Right,
+        "justify" | "just" => Align::Justify,
+        "justLow" => Align::JustLow,
+        "distributed" | "dist" => Align::Distributed,
+        _ => return Err(bad(cmd, "`align` must be left, center, right, justify, justLow or distributed")),
+    })
+}
+
+fn align_name(a: Align) -> &'static str {
+    match a {
+        Align::Left => "left",
+        Align::Center => "center",
+        Align::Right => "right",
+        Align::Justify => "justify",
+        Align::JustLow => "justLow",
+        Align::Distributed => "distributed",
+    }
+}
+
+fn spacing_parts(s: Option<Spacing>) -> (&'static str, f64) {
+    match s {
+        Some(Spacing::Pct(v)) => ("pct", v),
+        Some(Spacing::Pts(v)) => ("pts", v),
+        None => ("pts", 0.0),
+    }
+}
+
+fn paragraph_dialog_params(s: &Session) -> Value {
+    let pp = current_para(s);
+    let indent = pp.indent.unwrap_or(0.0);
+    let (special, by) = if indent > 0.05 {
+        ("first", indent)
+    } else if indent < -0.05 {
+        ("hanging", -indent)
+    } else {
+        ("none", 0.0)
+    };
+    let (line_kind, line_value) = match pp.line_spacing {
+        Some(Spacing::Pts(v)) => ("exactly", v),
+        Some(Spacing::Pct(v)) => ("multiple", v),
+        None => ("multiple", 1.0),
+    };
+    let (before_kind, before) = spacing_parts(pp.space_before);
+    let (after_kind, after) = spacing_parts(pp.space_after);
+    let tabs: Vec<Value> = pp.tabs.unwrap_or_default().iter().map(|t| json!({"pos": t.pos, "align": t.align})).collect();
+    json!({
+        "align": align_name(pp.align.unwrap_or(Align::Left)),
+        "indentLeft": pp.margin_left.unwrap_or(0.0),
+        "indentRight": pp.margin_right.unwrap_or(0.0),
+        "special": special,
+        "specialBy": by,
+        "spaceBefore": before,
+        "spaceBeforeKind": before_kind,
+        "spaceAfter": after,
+        "spaceAfterKind": after_kind,
+        "lineKind": line_kind,
+        "lineValue": line_value,
+        "tabs": tabs,
+        "defaultTab": pp.default_tab.unwrap_or(72.0),
+    })
+}
+
+fn write_spacing(kind: Option<&str>, value: f64) -> Spacing {
+    if kind == Some("pct") { Spacing::Pct(value.clamp(0.0, 10.0)) } else { Spacing::Pts(clamp_pt(value)) }
+}
+
+fn paragraph_dialog(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "format.paragraphDialog";
+    if !para_dialog_has_fields(p) {
+        s.ui_requests.push(crate::UiRequest::Dialog { id: "paragraph".into(), params: paragraph_dialog_params(s) });
+        return ok();
+    }
+    let align = match p.get("align") {
+        None => None,
+        Some(Value::String(a)) => Some(parse_align(CMD, a)?),
+        Some(_) => return Err(bad(CMD, "`align` must be a string")),
+    };
+    let indent_left = finite_key(p, CMD, "indentLeft")?.map(clamp_pt);
+    let indent_right = finite_key(p, CMD, "indentRight")?.map(clamp_pt);
+    let special_by = finite_key(p, CMD, "specialBy")?.map(|v| clamp_pt(v.max(0.0)));
+    let indent = match p.get("special") {
+        None => finite_key(p, CMD, "indentFirst")?.map(|v| v.clamp(-1584.0, 1584.0)),
+        Some(Value::String(kind)) => {
+            let by = special_by.unwrap_or(0.0);
+            Some(match kind.as_str() {
+                "none" => 0.0,
+                "first" | "firstLine" => by,
+                "hanging" | "hang" => -by,
+                _ => return Err(bad(CMD, "`special` must be none, first or hanging")),
+            })
+        }
+        Some(_) => return Err(bad(CMD, "`special` must be none, first or hanging")),
+    };
+    let space_before = finite_key(p, CMD, "spaceBefore")?;
+    let space_after = finite_key(p, CMD, "spaceAfter")?;
+    let before_kind = str_param(p, "spaceBeforeKind");
+    let after_kind = str_param(p, "spaceAfterKind");
+    for kind in [before_kind, after_kind].into_iter().flatten() {
+        if !matches!(kind, "pts" | "pct") {
+            return Err(bad(CMD, "spacing kind must be pts or pct"));
+        }
+    }
+    let line_mult = finite_key(p, CMD, "lineSpacing")?.map(|v| v.clamp(0.0, 9.99));
+    let line_pt = finite_key(p, CMD, "lineSpacingPt")?.map(clamp_pt);
+    format_para(s, &move |para| {
+        if align.is_some() {
+            para.props.align = align;
+        }
+        if indent_left.is_some() {
+            para.props.margin_left = indent_left;
+        }
+        if indent_right.is_some() {
+            para.props.margin_right = indent_right;
+        }
+        if indent.is_some() {
+            para.props.indent = indent;
+        }
+        if let Some(v) = space_before {
+            para.props.space_before = Some(write_spacing(before_kind, v));
+        }
+        if let Some(v) = space_after {
+            para.props.space_after = Some(write_spacing(after_kind, v));
+        }
+        if let Some(v) = line_mult {
+            para.props.line_spacing = Some(Spacing::Pct(v));
+        }
+        if let Some(v) = line_pt {
+            para.props.line_spacing = Some(Spacing::Pts(v));
+        }
+    })
+}
+
+fn tab_align(s: &str) -> Option<&'static str> {
+    Some(match s {
+        "l" | "left" => "l",
+        "ctr" | "center" => "ctr",
+        "r" | "right" => "r",
+        "dec" | "decimal" => "dec",
+        _ => return None,
+    })
+}
+
+fn tabs_params(s: &Session) -> Value {
+    let pp = current_para(s);
+    let stops: Vec<Value> = pp.tabs.unwrap_or_default().iter().map(|t| json!({"pos": t.pos, "align": t.align})).collect();
+    json!({"tabs": stops, "defaultTab": pp.default_tab.unwrap_or(72.0)})
+}
+
+fn tabs(s: &mut Session, p: &Value) -> Result<Value> {
+    const CMD: &str = "format.tabs";
+    let set = p.get("set");
+    let default_tab = finite_key(p, CMD, "defaultTab")?.map(|v| v.clamp(1.0, 1584.0));
+    if set.is_none() && default_tab.is_none() {
+        s.ui_requests.push(crate::UiRequest::Dialog { id: "tabs".into(), params: tabs_params(s) });
+        return ok();
+    }
+    let stops = match set {
+        None => None,
+        Some(Value::Array(items)) => {
+            if items.len() > 64 {
+                return Err(bad(CMD, "`set` has more than 64 tab stops"));
+            }
+            let mut out: Vec<TabStop> = Vec::new();
+            for (i, item) in items.iter().enumerate() {
+                let Some(obj) = item.as_object() else {
+                    return Err(bad(CMD, format!("tab stop {i} must be an object")));
+                };
+                let pos = obj
+                    .get("pos")
+                    .and_then(Value::as_f64)
+                    .filter(|n| n.is_finite())
+                    .map(clamp_pt)
+                    .ok_or_else(|| bad(CMD, format!("tab stop {i} needs a finite `pos`")))?;
+                let align = match obj.get("align").and_then(Value::as_str) {
+                    None => "l",
+                    Some(a) => tab_align(a).ok_or_else(|| bad(CMD, format!("tab stop {i} align must be l, ctr, r or dec")))?,
+                };
+                if let Some(prev) = out.iter_mut().find(|t| (t.pos - pos).abs() < 0.05) {
+                    *prev = TabStop { pos, align: align.to_string() };
+                } else {
+                    out.push(TabStop { pos, align: align.to_string() });
+                }
+            }
+            out.sort_by(|a, b| a.pos.total_cmp(&b.pos));
+            Some(out)
+        }
+        Some(_) => return Err(bad(CMD, "`set` must be an array")),
+    };
+    format_para(s, &move |para| {
+        if let Some(stops) = &stops {
+            para.props.tabs = Some(stops.clone());
+        }
+        if let Some(v) = default_tab {
+            para.props.default_tab = Some(v);
+        }
+    })
+}
+
 fn anchor(s: &mut Session, p: &Value) -> Result<Value> {
     let a = match str_param(p, "anchor").unwrap_or("top") {
         "middle" | "center" | "ctr" => Anchor::Middle,
@@ -901,7 +1142,7 @@ fn state(s: &mut Session, _p: &Value) -> Result<Value> {
 
 #[cfg(test)]
 mod tests {
-    use deckcraft_model::text::{Caps, Strike};
+    use deckcraft_model::text::{Align, Caps, ParaProps, Spacing, Strike};
     use deckcraft_model::{ColorBase, Fill, SchemeSlot};
     use serde_json::json;
 
@@ -1018,4 +1259,121 @@ mod tests {
         s.execute("edit.deselect", &json!({})).unwrap();
         assert!(s.execute("format.fontDialog", &json!({"bold": true})).is_err());
     }
+
+    fn para(s: &Session) -> ParaProps {
+        s.doc().unwrap().selected_shapes().first().and_then(|sh| sh.text.as_ref()).and_then(|t| t.paragraphs.first()).unwrap().props.clone()
+    }
+
+    #[test]
+    fn paragraph_dialog_applies_alignment_indent_and_spacing_in_one_undo() {
+        let mut s = shape();
+        let before = s.doc().unwrap().history.undo.len();
+        s.execute(
+            "format.paragraphDialog",
+            &json!({
+                "align": "justify",
+                "indentLeft": 36.0,
+                "indentRight": 18.0,
+                "special": "hanging",
+                "specialBy": 18.0,
+                "spaceBefore": 6.0,
+                "spaceAfter": 8.0,
+                "lineSpacing": 1.5
+            }),
+        )
+        .unwrap();
+        assert_eq!(s.doc().unwrap().history.undo.len(), before + 1);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Paragraph…");
+        let p = para(&s);
+        assert_eq!(p.align, Some(Align::Justify));
+        assert_eq!(p.margin_left, Some(36.0));
+        assert_eq!(p.margin_right, Some(18.0));
+        assert_eq!(p.indent, Some(-18.0));
+        assert_eq!(p.space_before, Some(Spacing::Pts(6.0)));
+        assert_eq!(p.space_after, Some(Spacing::Pts(8.0)));
+        assert_eq!(p.line_spacing, Some(Spacing::Pct(1.5)));
+        s.execute("edit.undo", &json!({})).unwrap();
+        let p = para(&s);
+        assert_eq!(p.align, Some(Align::Center), "undo restores the alignment shape.insert wrote");
+        assert!(p.margin_left.is_none() && p.indent.is_none() && p.space_before.is_none() && p.line_spacing.is_none());
+    }
+
+    #[test]
+    fn paragraph_dialog_first_line_and_exact_spacing_replace_only_those_fields() {
+        let mut s = shape();
+        s.execute("format.paragraphDialog", &json!({"align": "right"})).unwrap();
+        s.execute("format.paragraphDialog", &json!({"special": "first", "specialBy": 27.0, "lineSpacingPt": 20.0})).unwrap();
+        let p = para(&s);
+        assert_eq!(p.align, Some(Align::Right));
+        assert_eq!(p.indent, Some(27.0));
+        assert_eq!(p.line_spacing, Some(Spacing::Pts(20.0)));
+        assert!(p.margin_left.is_none());
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(para(&s).align, Some(Align::Right));
+        assert!(para(&s).indent.is_none());
+    }
+
+    #[test]
+    fn paragraph_dialog_with_no_fields_asks_the_ui_to_open() {
+        let mut s = shape();
+        let rev = s.doc().unwrap().revision;
+        let n = s.doc().unwrap().history.undo.len();
+        s.ui_requests.clear();
+        s.execute("format.paragraphDialog", &json!({})).unwrap();
+        assert_eq!(s.doc().unwrap().revision, rev);
+        assert_eq!(s.doc().unwrap().history.undo.len(), n);
+        let Some(UiRequest::Dialog { id, params }) = s.ui_requests.last() else { panic!("dialog request") };
+        assert_eq!(id, "paragraph");
+        assert_eq!(params["align"], "center", "a new shape's text is centred");
+        assert_eq!(params["special"], "none");
+        assert_eq!(params["lineKind"], "multiple");
+        assert!(params["lineValue"].as_f64().is_some_and(|v| v > 0.0));
+    }
+
+    #[test]
+    fn paragraph_dialog_rejects_bad_fields_without_editing() {
+        let mut s = shape();
+        let n = s.doc().unwrap().history.undo.len();
+        assert!(s.execute("format.paragraphDialog", &json!({"align": "sparkle"})).unwrap_err().to_string().contains("align"));
+        assert!(s.execute("format.paragraphDialog", &json!({"special": "middle"})).is_err());
+        assert!(s.execute("format.paragraphDialog", &json!({"indentLeft": "wide"})).is_err());
+        assert!(s.execute("format.paragraphDialog", &json!({"lineSpacing": "double"})).is_err());
+        assert!(s.execute("format.paragraphDialog", &json!({"spaceBeforeKind": "lines", "spaceBefore": 4.0})).is_err());
+        assert_eq!(s.doc().unwrap().history.undo.len(), n);
+        assert_eq!(para(&s).align, Some(Align::Center));
+        assert!(para(&s).indent.is_none());
+    }
+
+    #[test]
+    fn tabs_dialog_sets_stops_in_one_undo_and_opens_with_no_fields() {
+        let mut s = shape();
+        let before = s.doc().unwrap().history.undo.len();
+        s.execute(
+            "format.tabs",
+            &json!({"set": [{"pos": 144.0, "align": "center"}, {"pos": 72.0, "align": "dec"}, {"pos": 72.02, "align": "right"}], "defaultTab": 36.0}),
+        )
+        .unwrap();
+        assert_eq!(s.doc().unwrap().history.undo.len(), before + 1);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Tabs…");
+        let p = para(&s);
+        let tabs = p.tabs.unwrap();
+        assert_eq!(tabs.len(), 2, "stops within 0.05 pt collapse");
+        assert_eq!(tabs[0].pos, 72.02);
+        assert_eq!(tabs[0].align, "r");
+        assert_eq!(tabs[1].align, "ctr");
+        assert_eq!(p.default_tab, Some(36.0));
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert!(para(&s).tabs.is_none() && para(&s).default_tab.is_none());
+
+        let n = s.doc().unwrap().history.undo.len();
+        s.ui_requests.clear();
+        s.execute("format.tabs", &json!({})).unwrap();
+        assert_eq!(s.doc().unwrap().history.undo.len(), n);
+        let Some(UiRequest::Dialog { id, params }) = s.ui_requests.last() else { panic!("dialog request") };
+        assert_eq!(id, "tabs");
+        assert!(params["tabs"].as_array().is_some_and(|a| a.is_empty()));
+        assert!(s.execute("format.tabs", &json!({"set": [{"pos": 10.0, "align": "sparkle"}]})).is_err());
+        assert!(s.execute("format.tabs", &json!({"set": "nope"})).is_err());
+        assert_eq!(s.doc().unwrap().history.undo.len(), n);
+    }
 }
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 9959882d..0e22789c 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -639,6 +639,10 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
                 let _ = app.run("format.fontDialog", json!({}));
                 ui.close();
             }
+            if ui.button("Paragraph…").clicked() {
+                let _ = app.run("format.paragraphDialog", json!({}));
+                ui.close();
+            }
             ui.menu_button("Bring to Front", |ui| {
                 crate::ribbon::menu_item(app, ui, crate::icons::Icon::BringToFront, "Bring to Front", "arrange.bringToFront", json!({}));
                 crate::ribbon::menu_item(app, ui, crate::icons::Icon::BringForward, "Bring Forward", "arrange.bringForward", json!({}));
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 7348b5bd..70924563 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -1,4 +1,4 @@
-//! Dialogs (Insert Table, Slide Size, Font, Header & Footer, Hyperlink, Set Up Show, Zoom, …) and the
+//! Dialogs (Insert Table, Slide Size, Font, Paragraph, Tabs, Header & Footer, Hyperlink, Set Up Show, Zoom, …) and the
 //! About window. The start screen is File › Home (`backstage.rs`).
 
 use egui::{Align2, Color32, CornerRadius, Rect, Sense, Stroke, Ui, pos2, vec2};
@@ -43,6 +43,7 @@ fn title(id: &str) -> &'static str {
         "renameShape" => "Rename",
         "renameLayout" => "Rename Layout",
         "paragraph" => "Paragraph",
+        "tabs" => "Tabs",
         "font" => "Font",
         "about" => "About DeckCraft",
         "preferences" => "Preferences",
@@ -75,8 +76,17 @@ pub fn show(app: &mut SlideApp, ctx: &egui::Context) {
             ui.set_min_width(340.0);
             close = body(app, ui, &mut d);
         });
-    if open && !close && !ctx.input(|i| i.key_pressed(egui::Key::Escape)) {
+    let escape = ctx.input(|i| i.key_pressed(egui::Key::Escape));
+    if open && !close && !escape {
         app.dialog = Some(d);
+    } else if app.dialog.is_none()
+        && let Some(ret) = d.params.get("returnParams").filter(|v| v.is_object()).cloned()
+    {
+        // Tabs… opened from Paragraph: closing it (OK, Cancel, Esc or the window) returns there.
+        let id = d.params.get("returnId").and_then(Value::as_str).unwrap_or("paragraph");
+        let mut back = Dialog::new(id);
+        back.params = ret;
+        app.dialog = Some(back);
     }
 }
 
@@ -384,22 +394,8 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             ok || cancel
         }
         "font" => font_dialog(app, ui, d),
-        "paragraph" => {
-            field(ui, d, "Before text (in):", "left", "0");
-            field(ui, d, "Special — hanging (in):", "hang", "0");
-            field(ui, d, "Spacing before (pt):", "before", "0");
-            field(ui, d, "Spacing after (pt):", "after", "0");
-            field(ui, d, "Line spacing (lines):", "lines", "1.0");
-            let (ok, cancel) = buttons(ui, "OK");
-            if ok {
-                run(
-                    app,
-                    "format.paragraph",
-                    json!({"indentLeft": num(d, "left", 0.0) * 72.0, "indentFirst": -num(d, "hang", 0.0) * 72.0, "spaceBefore": num(d, "before", 0.0), "spaceAfter": num(d, "after", 0.0), "lineSpacing": num(d, "lines", 1.0)}),
-                );
-            }
-            ok || cancel
-        }
+        "paragraph" => paragraph_dialog(app, ui, d),
+        "tabs" => tabs_dialog(app, ui, d),
         "export" => {
             ui.label("Export the presentation as:");
             let fmt = d.get("fmt", "pdf");
@@ -1036,6 +1032,330 @@ fn font_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     ok || cancel
 }
 
+fn pt_text(v: Option<&Value>, default: f64) -> String {
+    match v.and_then(Value::as_f64).filter(|n| n.is_finite()) {
+        Some(n) => crate::widgets::fmt_num(n, ""),
+        None => crate::widgets::fmt_num(default, ""),
+    }
+}
+
+fn inches_text(v: Option<&Value>) -> String {
+    crate::widgets::fmt_num(v.and_then(Value::as_f64).filter(|n| n.is_finite()).unwrap_or(0.0) / 72.0, "")
+}
+
+fn seed_paragraph_fields(d: &mut Dialog) {
+    seed_once(d, "align", json_text(d.params.get("align"), "left"));
+    seed_once(d, "before", inches_text(d.params.get("indentLeft")));
+    seed_once(d, "after", inches_text(d.params.get("indentRight")));
+    seed_once(d, "special", json_text(d.params.get("special"), "none"));
+    seed_once(d, "by", inches_text(d.params.get("specialBy")));
+    seed_once(d, "spaceBefore", pt_text(d.params.get("spaceBefore"), 0.0));
+    seed_once(d, "spaceBeforeSeed", pt_text(d.params.get("spaceBefore"), 0.0));
+    seed_once(d, "spaceAfter", pt_text(d.params.get("spaceAfter"), 0.0));
+    seed_once(d, "spaceAfterSeed", pt_text(d.params.get("spaceAfter"), 0.0));
+    seed_once(d, "lineKind", json_text(d.params.get("lineKind"), "multiple"));
+    seed_once(d, "lineValue", pt_text(d.params.get("lineValue"), 1.0));
+}
+
+fn paragraph_return_params(d: &mut Dialog) -> Value {
+    let before = finite_pt(&d.get("before", "0")).unwrap_or(0.0) * 72.0;
+    let after = finite_pt(&d.get("after", "0")).unwrap_or(0.0) * 72.0;
+    let by = finite_pt(&d.get("by", "0")).unwrap_or(0.0) * 72.0;
+    let space_before = finite_pt(&d.get("spaceBefore", "0")).unwrap_or(0.0);
+    let space_after = finite_pt(&d.get("spaceAfter", "0")).unwrap_or(0.0);
+    let line_value = finite_pt(&d.get("lineValue", "1")).unwrap_or(1.0);
+    let before_same = d.get("spaceBefore", "") == d.get("spaceBeforeSeed", "");
+    let after_same = d.get("spaceAfter", "") == d.get("spaceAfterSeed", "");
+    let v = json!({
+        "align": d.get("align", "left"),
+        "indentLeft": before,
+        "indentRight": after,
+        "special": d.get("special", "none"),
+        "specialBy": by,
+        "spaceBefore": space_before,
+        "spaceBeforeKind": if before_same { d.params.get("spaceBeforeKind").and_then(Value::as_str).unwrap_or("pts") } else { "pts" },
+        "spaceAfter": space_after,
+        "spaceAfterKind": if after_same { d.params.get("spaceAfterKind").and_then(Value::as_str).unwrap_or("pts") } else { "pts" },
+        "lineKind": d.get("lineKind", "multiple"),
+        "lineValue": line_value,
+        "tabs": d.params.get("tabs").cloned().unwrap_or_else(|| json!([])),
+        "defaultTab": d.params.get("defaultTab").cloned().unwrap_or_else(|| json!(72.0)),
+    });
+    v
+}
+
+fn line_preset_label(kind: &str, value: &str) -> &'static str {
+    if kind == "exactly" {
+        "Exactly"
+    } else {
+        match value {
+            "1" => "Single",
+            "1.5" => "1.5 lines",
+            "2" => "Double",
+            _ => "Multiple",
+        }
+    }
+}
+
+/// Home › Paragraph launcher. One OK applies alignment, indentation and spacing together.
+fn paragraph_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    ui.set_min_width(460.0);
+    seed_paragraph_fields(d);
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(110.0, 20.0), egui::Label::new("Alignment"));
+        choice(
+            ui,
+            d,
+            "paragraph_align",
+            "align",
+            &[
+                ("left", "Left"),
+                ("center", "Center"),
+                ("right", "Right"),
+                ("justify", "Justify"),
+                ("justLow", "Justify low"),
+                ("distributed", "Distributed"),
+            ],
+        );
+    });
+    ui.label(egui::RichText::new("Indentation").strong());
+    ui.horizontal(|ui| {
+        let _ = labeled_text(ui, d, "Before text", "before", 64.0);
+        ui.label("in");
+        ui.add_space(12.0);
+        let _ = labeled_text(ui, d, "After text", "after", 64.0);
+        ui.label("in");
+    });
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(110.0, 20.0), egui::Label::new("Special"));
+        choice(ui, d, "paragraph_special", "special", &[("none", "None"), ("first", "First line"), ("hanging", "Hanging")]);
+        ui.add_space(8.0);
+        let _ = labeled_text(ui, d, "By", "by", 64.0);
+        ui.label("in");
+    });
+    ui.label(egui::RichText::new("Spacing").strong());
+    ui.horizontal(|ui| {
+        let _ = labeled_text(ui, d, "Spacing before", "spaceBefore", 64.0);
+        ui.label("pt");
+        ui.add_space(12.0);
+        let _ = labeled_text(ui, d, "Spacing after", "spaceAfter", 64.0);
+        ui.label("pt");
+    });
+    let mut picked: Option<(&'static str, Option<&'static str>)> = None;
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(110.0, 20.0), egui::Label::new("Line spacing"));
+        let kind = d.get("lineKind", "multiple");
+        let value = d.get("lineValue", "1");
+        egui::ComboBox::from_id_salt("paragraph_line").selected_text(line_preset_label(&kind, &value)).width(140.0).show_ui(ui, |ui| {
+            for (label, k, v) in [
+                ("Single", "multiple", Some("1")),
+                ("1.5 lines", "multiple", Some("1.5")),
+                ("Double", "multiple", Some("2")),
+                ("Multiple", "multiple", None),
+                ("Exactly", "exactly", None),
+            ] {
+                if ui.selectable_label(line_preset_label(&kind, &value) == label, label).clicked() {
+                    picked = Some((k, v));
+                }
+            }
+        });
+        ui.add_space(8.0);
+        let _ = labeled_text(ui, d, "At", "lineValue", 64.0);
+    });
+    if let Some((kind, value)) = picked {
+        d.fields.insert("lineKind".into(), kind.into());
+        if let Some(v) = value {
+            d.fields.insert("lineValue".into(), v.into());
+        } else if kind == "exactly" && finite_pt(&d.get("lineValue", "1")).is_some_and(|n| n <= 9.99) {
+            d.fields.insert("lineValue".into(), "18".into());
+        } else if kind == "multiple" && finite_pt(&d.get("lineValue", "1")).is_some_and(|n| n > 9.99) {
+            d.fields.insert("lineValue".into(), "1".into());
+        }
+    }
+    let mut open_tabs = false;
+    ui.horizontal(|ui| {
+        if ui.button("Tabs…").clicked() {
+            open_tabs = true;
+        }
+    });
+    let (ok, cancel) = buttons(ui, "OK");
+    if open_tabs {
+        let mut tabs = Dialog::new("tabs");
+        tabs.params = json!({
+            "tabs": d.params.get("tabs").cloned().unwrap_or_else(|| json!([])),
+            "defaultTab": d.params.get("defaultTab").cloned().unwrap_or_else(|| json!(72.0)),
+            "returnId": "paragraph",
+            "returnParams": paragraph_return_params(d),
+        });
+        app.dialog = Some(tabs);
+        return true;
+    }
+    if ok {
+        let Some(before_in) = finite_pt(&d.get("before", "")) else {
+            app.set_status("Indent before text must be a number of inches");
+            return false;
+        };
+        let Some(after_in) = finite_pt(&d.get("after", "")) else {
+            app.set_status("Indent after text must be a number of inches");
+            return false;
+        };
+        let Some(by_in) = finite_pt(&d.get("by", "")) else {
+            app.set_status("Special indent must be a number of inches");
+            return false;
+        };
+        let Some(space_before) = finite_pt(&d.get("spaceBefore", "")) else {
+            app.set_status("Spacing before must be a number");
+            return false;
+        };
+        let Some(space_after) = finite_pt(&d.get("spaceAfter", "")) else {
+            app.set_status("Spacing after must be a number");
+            return false;
+        };
+        let Some(line_value) = finite_pt(&d.get("lineValue", "")) else {
+            app.set_status("Line spacing must be a number");
+            return false;
+        };
+        let mut params = json!({
+            "align": d.get("align", "left"),
+            "indentLeft": before_in * 72.0,
+            "indentRight": after_in * 72.0,
+            "special": d.get("special", "none"),
+            "specialBy": by_in * 72.0,
+            "spaceBefore": space_before,
+            "spaceAfter": space_after,
+            "spaceBeforeKind": if d.get("spaceBefore", "") == d.get("spaceBeforeSeed", "") { d.params.get("spaceBeforeKind").and_then(Value::as_str).unwrap_or("pts") } else { "pts" },
+            "spaceAfterKind": if d.get("spaceAfter", "") == d.get("spaceAfterSeed", "") { d.params.get("spaceAfterKind").and_then(Value::as_str).unwrap_or("pts") } else { "pts" },
+        });
+        if d.get("lineKind", "multiple") == "exactly" {
+            params["lineSpacingPt"] = json!(line_value);
+        } else {
+            params["lineSpacing"] = json!(line_value);
+        }
+        if app.run("format.paragraphDialog", params).is_err() {
+            return false;
+        }
+    }
+    ok || cancel
+}
+
+fn tab_rows(v: &Value) -> Vec<(f64, String)> {
+    v.as_array()
+        .map(|a| {
+            a.iter()
+                .filter_map(|t| {
+                    let pos = t.get("pos").and_then(Value::as_f64).filter(|n| n.is_finite())?;
+                    let align = t.get("align").and_then(Value::as_str).unwrap_or("l").to_string();
+                    Some((pos, align))
+                })
+                .collect()
+        })
+        .unwrap_or_default()
+}
+
+fn tab_label(align: &str) -> &'static str {
+    match align {
+        "ctr" => "Center",
+        "r" => "Right",
+        "dec" => "Decimal",
+        _ => "Left",
+    }
+}
+
+/// Standalone Tabs dialog (the ruler dialog from the open tabs work is not on main).
+/// OK applies the stops in one step. Opened from Paragraph, closing returns there.
+fn tabs_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    ui.set_min_width(420.0);
+    if d.params.get("editing").is_none() {
+        d.params["edit"] = d.params.get("tabs").cloned().unwrap_or_else(|| json!([]));
+        d.params["editing"] = json!(true);
+    }
+    seed_once(d, "pos", "0.5".to_string());
+    seed_once(d, "stopAlign", "l".to_string());
+    seed_once(d, "defaultTab", inches_text(d.params.get("defaultTab")));
+    seed_once(d, "sel", String::new());
+    let rows = tab_rows(d.params.get("edit").unwrap_or(&Value::Null));
+    ui.label("Tab stop position");
+    egui::ScrollArea::vertical().max_height(140.0).show(ui, |ui| {
+        if rows.is_empty() {
+            ui.label(egui::RichText::new("No custom stops").weak());
+        }
+        for (i, (pos, align)) in rows.iter().enumerate() {
+            let label = format!("{} in  {}", crate::widgets::fmt_num(pos / 72.0, ""), tab_label(align));
+            let on = d.get("sel", "") == i.to_string();
+            if ui.selectable_label(on, label).clicked() {
+                d.fields.insert("sel".into(), i.to_string());
+                d.fields.insert("pos".into(), crate::widgets::fmt_num(pos / 72.0, ""));
+                d.fields.insert("stopAlign".into(), align.clone());
+            }
+        }
+    });
+    ui.horizontal(|ui| {
+        let _ = labeled_text(ui, d, "Position", "pos", 64.0);
+        ui.label("in");
+        ui.add_space(8.0);
+        choice(ui, d, "tabs_align", "stopAlign", &[("l", "Left"), ("ctr", "Center"), ("r", "Right"), ("dec", "Decimal")]);
+    });
+    ui.horizontal(|ui| {
+        if ui.button("Set").clicked()
+            && let Some(inches) = finite_pt(&d.get("pos", ""))
+        {
+            let pos = (inches * 72.0).clamp(0.0, 1584.0);
+            let align = d.get("stopAlign", "l");
+            let mut rows = tab_rows(d.params.get("edit").unwrap_or(&Value::Null));
+            let sel = d.get("sel", "").parse::<usize>().ok();
+            if let Some(i) = sel.filter(|i| *i < rows.len()) {
+                rows[i] = (pos, align);
+            } else if rows.len() < 64 {
+                rows.push((pos, align));
+                d.fields.insert("sel".into(), (rows.len() - 1).to_string());
+            }
+            rows.sort_by(|a, b| a.0.total_cmp(&b.0));
+            d.params["edit"] = json!(rows.iter().map(|(p, a)| json!({"pos": p, "align": a})).collect::<Vec<_>>());
+        }
+        if ui.button("Clear").clicked()
+            && let Some(i) = d.get("sel", "").parse::<usize>().ok()
+        {
+            let mut rows = tab_rows(d.params.get("edit").unwrap_or(&Value::Null));
+            if i < rows.len() {
+                rows.remove(i);
+                d.params["edit"] = json!(rows.iter().map(|(p, a)| json!({"pos": p, "align": a})).collect::<Vec<_>>());
+                d.fields.insert("sel".into(), String::new());
+            }
+        }
+        if ui.button("Clear All").clicked() {
+            d.params["edit"] = json!([]);
+            d.fields.insert("sel".into(), String::new());
+        }
+    });
+    ui.horizontal(|ui| {
+        let _ = labeled_text(ui, d, "Default", "defaultTab", 64.0);
+        ui.label("in");
+    });
+    let (ok, cancel) = buttons(ui, "OK");
+    if ok {
+        let Some(default_in) = finite_pt(&d.get("defaultTab", "")) else {
+            app.set_status("Default tab stops must be a number of inches");
+            return false;
+        };
+        let set: Vec<Value> =
+            tab_rows(d.params.get("edit").unwrap_or(&Value::Null)).into_iter().map(|(p, a)| json!({"pos": p, "align": a})).collect();
+        if app.run("format.tabs", json!({"set": set, "defaultTab": (default_in * 72.0).clamp(1.0, 1584.0)})).is_err() {
+            return false;
+        }
+        let applied = d.params.get("edit").cloned().unwrap_or_else(|| json!([]));
+        let default_pt = (default_in * 72.0).clamp(1.0, 1584.0);
+        if let Some(ret) = d.params.get_mut("returnParams") {
+            ret["tabs"] = applied;
+            ret["defaultTab"] = json!(default_pt);
+        }
+    }
+    ok || cancel
+}
+
 #[cfg(test)]
 #[path = "font_dialog_tests.rs"]
 mod font_dialog_tests;
+
+#[cfg(test)]
+#[path = "paragraph_dialog_tests.rs"]
+mod paragraph_dialog_tests;
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index c294278f..82ec182d 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -223,6 +223,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
             "Format",
             vec![
                 ("Font…", "format.fontDialog"),
+                ("Paragraph…", "format.paragraphDialog"),
                 ("Bold", "format.bold"),
                 ("Italic", "format.italic"),
                 ("Underline", "format.underline"),
diff --git a/crates/ui-egui/src/paragraph_dialog_tests.rs b/crates/ui-egui/src/paragraph_dialog_tests.rs
new file mode 100644
index 00000000..cba8fe53
--- /dev/null
+++ b/crates/ui-egui/src/paragraph_dialog_tests.rs
@@ -0,0 +1,88 @@
+//! The Paragraph dialog: Home › Paragraph › Paragraph… opens it, OK applies one undo step,
+//! and Tabs… edits stops then returns to Paragraph.
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut s = Session::with_new();
+    s.execute("shape.insert", &json!({"preset": "rect", "rect": [80.0, 80.0, 320.0, 80.0], "text": "Hello"})).unwrap();
+    let _ = s.execute("text.exit", &json!({}));
+    let app = SlideApp::new(s, Services::default());
+    let mut h = Harness::builder().with_size(egui::vec2(1440.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(4);
+    h
+}
+
+fn align_of(h: &Harness<'_, SlideApp>) -> Option<String> {
+    let st = h.state().session.active().unwrap();
+    st.selected_shapes()
+        .first()
+        .and_then(|sh| sh.text.as_ref())
+        .and_then(|t| t.paragraphs.first())
+        .and_then(|p| p.props.align.map(|a| a.xml().to_string()))
+}
+
+fn tabs_of(h: &Harness<'_, SlideApp>) -> Vec<(f64, String)> {
+    let st = h.state().session.active().unwrap();
+    st.selected_shapes()
+        .first()
+        .and_then(|sh| sh.text.as_ref())
+        .and_then(|t| t.paragraphs.first())
+        .and_then(|p| p.props.tabs.clone())
+        .unwrap_or_default()
+        .into_iter()
+        .map(|t| (t.pos, t.align))
+        .collect()
+}
+
+#[test]
+fn paragraph_button_aligns_text_in_one_undo() {
+    let mut h = harness();
+    h.get_by_label("Paragraph…").click();
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("paragraph"));
+    h.state_mut().dialog.as_mut().unwrap().fields.insert("align".into(), "right".into());
+    h.get_by_label("OK").click_accesskit();
+    h.run_steps(1);
+    assert!(h.state().dialog.is_none(), "status {:?}", h.state().status);
+    assert_eq!(align_of(&h).as_deref(), Some("r"));
+    assert_eq!(h.state().session.active().unwrap().history.undo.last().unwrap().label, "Paragraph…");
+}
+
+#[test]
+fn tabs_from_paragraph_applies_a_stop_and_returns() {
+    let mut h = harness();
+    h.get_by_label("Paragraph…").click();
+    h.run_steps(2);
+    h.state_mut().dialog.as_mut().unwrap().fields.insert("align".into(), "right".into());
+    h.get_by_label("Tabs…").click_accesskit();
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("tabs"), "status {:?}", h.state().status);
+    {
+        let d = h.state_mut().dialog.as_mut().unwrap();
+        d.params["editing"] = json!(true);
+        d.params["edit"] = json!([{"pos": 144.0, "align": "ctr"}]);
+    }
+    h.get_by_label("OK").click_accesskit();
+    // The Tabs OK frame restores Paragraph; the next frame fills its fields.
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("paragraph"), "status {:?}", h.state().status);
+    assert_eq!(h.state().dialog.as_ref().unwrap().fields.get("align").map(String::as_str), Some("right"));
+    assert_eq!(tabs_of(&h), vec![(144.0, "ctr".into())]);
+    assert_eq!(h.state().session.active().unwrap().history.undo.last().unwrap().label, "Tabs…");
+    h.get_by_label("Cancel").click_accesskit();
+    h.run_steps(1);
+    assert!(h.state().dialog.is_none());
+    assert_eq!(align_of(&h).as_deref(), Some("ctr"), "cancelling Paragraph leaves the alignment shape.insert wrote");
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index d67aaf0a..5fc6f0c1 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -595,7 +595,7 @@ fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                         }
                     }
                     if ui.button("Line Spacing Options…").clicked() {
-                        app.dialog = Some(crate::dialogs::Dialog::new("paragraph"));
+                        run(app, "format.paragraphDialog", json!({}));
                     }
                 });
                 let r = icon_toggle(ui, Icon::Columns, "Columns", en, false);
@@ -636,6 +636,9 @@ fn paragraph_group(app: &mut SlideApp, ui: &mut Ui, st: &Value) {
                         }
                     }
                 });
+                if ui.add_enabled(en, egui::Button::new("Paragraph…").min_size(vec2(88.0, 22.0))).on_hover_text("Paragraph").clicked() {
+                    run(app, "format.paragraphDialog", json!({}));
+                }
             });
         });
     });
diff --git a/docs/architecture.md b/docs/architecture.md
index c844d460..6397b721 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog, 227 commands, 28 dialogs; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Paragraph and Tabs dialogs, 229 commands, 29 dialogs; previous: minor, Font dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -20,8 +20,8 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (229 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 29 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
@@ -78,6 +78,7 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Paragraph and Tabs dialogs; command registry 229; 29 dialogs |
 | 2026-10-14 | minor | Font dialog; command registry 227; 28 dialogs |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index 4368c0d4..42795059 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Paragraph dialog; previous: minor, Font dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,9 +203,10 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60. The Font dialog is in (family, size, style, underline,
-  colour, strikethrough, baseline, caps, character spacing, one undo step). Still missing: Bullets
-  and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object…. 6–12 h.
+- **Dialogs**: 29 dialogs vs PowerPoint's ~60. The Font dialog and the Paragraph dialog are in
+  (Paragraph: alignment, first-line and hanging indents, spacing before/after, line spacing, and a
+  Tabs dialog, each OK one undo step). Still missing: Bullets and Numbering, Find/Replace, Replace
+  Fonts, Action Settings, Print, Insert Object…. 4–8 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -257,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Paragraph dialog sets alignment, indentation, spacing and line spacing in one step; its Tabs… button opens a standalone Tabs dialog |
 | 2026-10-14 | minor | Font dialog sets typeface, size, style, underline, colour, strikethrough, baseline, caps and character spacing in one step |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index a31d0964..efcc3684 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (227 commands; previous: minor, hours to ~95% per audience added; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (229 commands; previous: trivial, 227 commands; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -239,7 +239,7 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
+- **Automation:** 229 commands, every one reachable from `deckcraft-cli`, the JSON control channel
   and MCP.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Command count 227 → 229 (Paragraph dialog and Tabs). Breadth and ready percentages unchanged |
 | 2026-10-14 | trivial | Command count 226 → 227 (Font dialog). Breadth and ready percentages unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index 6362973b..ac0da780 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -2,7 +2,7 @@
 
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog; previous: minor, text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Paragraph dialog; previous: minor, Font dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Font, Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 29 (`crates/ui-egui/src/dialogs.rs`): Font, Paragraph, Tabs, Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -82,7 +82,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Crop handles, crop to shape, aspect ratio | yes | partial |
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
 | Exact size/position, lock aspect | yes | yes |
-| Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
+| Rulers with indent markers and tab stops | yes | rulers yes; tab stops are set in the Tabs dialog, not on the ruler |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
 | Drag and drop of files and between thumbnails | yes | yes |
 | Image paste from the clipboard | yes | macOS yes; Windows and Linux no (#53) |
@@ -137,7 +137,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 |---|---|
 | Native macOS menu bar from `menu_tree()`, filled out to PowerPoint's menu items | 3–5 |
 | Format Shape pane depth | 6–10 |
-| Missing dialogs (Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 6–12 |
+| Missing dialogs (Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 4–8 |
 | Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
 | Grid Options, edit points UI, crop depth | 4–7 |
 | Multiple windows | 3–5 |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Paragraph dialog from the Home › Paragraph launcher; Tabs… opens a standalone Tabs dialog |
 | 2026-10-14 | minor | Font dialog from Home › Font, the shape menu and Cmd+T |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |

From cbc6cd0e347e6a7af3e67a7a42d7f3d9d8481b3b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:03:16 +0300
Subject: [PATCH 244/376] Charts: draw data-point fills on columns and bars,
 smoothed lines, and the file's chart text colour

---
 crates/pptx/src/read/chart.rs | 31 ++++++++++++++++++++++
 crates/render/src/chart.rs    | 48 ++++++++++++++++++++++++++++-------
 crates/render/src/tests.rs    | 24 ++++++++++++++++++
 3 files changed, 94 insertions(+), 9 deletions(-)

diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 6d7541ff..0045e4a5 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -281,10 +281,33 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
     // the chart): the axes' and legend's, else the whole chart's; the title's own.
     let chart_size = text_size(root.child("txPr"));
     c.text_size = [val_ax, cat_ax, ch.child("legend")].into_iter().flatten().find_map(|e| text_size(e.child("txPr"))).or(chart_size);
+    // Text colour likewise: the axes' and legend's, else the whole chart's.
+    c.text_color = [val_ax, cat_ax, ch.child("legend"), Some(root)].into_iter().flatten().find_map(|e| text_color(e.child("txPr")));
     c.title_size = ch.child("title").and_then(|t| text_size(t.child("tx").and_then(|x| x.child("rich"))).or_else(|| text_size(t.child("txPr"))));
     Some(c)
 }
 
+/// The colour of the first `a:defRPr` or `a:rPr` with a solid fill under `e`.
+fn text_color(e: Option<&El>) -> Option<deckcraft_model::ColorRef> {
+    fn rec(e: &El, depth: usize) -> Option<deckcraft_model::ColorRef> {
+        if depth > 8 {
+            return None;
+        }
+        for c in e.elements() {
+            if (c.is("defRPr") || c.is("rPr"))
+                && let Some(Fill::Solid { color }) = simple_fill(Some(c))
+            {
+                return Some(color);
+            }
+            if let Some(v) = rec(c, depth + 1) {
+                return Some(v);
+            }
+        }
+        None
+    }
+    rec(e?, 0)
+}
+
 /// The size in points of the first `a:defRPr` or `a:rPr` with one under `e` (`sz` in hundredths).
 fn text_size(e: Option<&El>) -> Option<f64> {
     fn rec(e: &El, depth: usize) -> Option<f64> {
@@ -363,6 +386,14 @@ mod tests {
         assert!(c.series.iter().all(|s| !s.secondary_axis));
     }
 
+    #[test]
+    fn text_colour_is_read_from_the_axes() {
+        // LibreOffice's templates set light axis text for dark slides on the axes' c:txPr.
+        let xml = r#"<c:chartSpace xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><c:chart><c:plotArea><c:barChart><c:barDir val="col"/><c:ser><c:idx val="0"/><c:val><c:numRef><c:numCache><c:ptCount val="1"/><c:pt idx="0"><c:v>1</c:v></c:pt></c:numCache></c:numRef></c:val></c:ser><c:axId val="1"/><c:axId val="2"/></c:barChart><c:catAx><c:axId val="1"/><c:txPr><a:bodyPr/><a:p><a:pPr><a:defRPr sz="1000"><a:solidFill><a:srgbClr val="FFFFFF"/></a:solidFill></a:defRPr></a:pPr></a:p></c:txPr></c:catAx><c:valAx><c:axId val="2"/></c:valAx></c:plotArea></c:chart></c:chartSpace>"#;
+        let c = read_chart_xml(xml.as_bytes()).unwrap();
+        assert_eq!(c.text_color, Some(deckcraft_model::ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 255, 255))));
+    }
+
     #[test]
     fn text_sizes_are_read_from_the_file() {
         // PowerPoint's new charts set the axes' and legend's text to 11.97 pt and the title's to
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..bbdc2330 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -36,6 +36,43 @@ fn series_fill(ctx: &Ctx, c: &Chart, i: usize, s: Option<&deckcraft_model::chart
     }
 }
 
+/// The fill of point `k` of a series: its own (`c:dPt`) where the file gives one, else the series'.
+fn point_fill(ctx: &Ctx, c: &Chart, i: usize, s: &deckcraft_model::chart::Series, k: usize) -> Rgba {
+    match s.point_fills.iter().find(|(p, _)| *p == k).map(|(_, f)| f) {
+        Some(Fill::Solid { color: cc }) => ctx.color(cc, None),
+        _ => series_fill(ctx, c, i, Some(s)),
+    }
+}
+
+fn polyline(pts: &[Point]) -> BezPath {
+    let mut p = BezPath::new();
+    for (k, q) in pts.iter().enumerate() {
+        if k == 0 {
+            p.move_to(*q);
+        } else {
+            p.line_to(*q);
+        }
+    }
+    p
+}
+
+/// A smoothed line (`c:smooth`) through `pts`: a Catmull-Rom spline as cubic Béziers, the curve
+/// PowerPoint draws, passing through every point.
+pub(crate) fn smooth_path(pts: &[Point]) -> BezPath {
+    let mut p = BezPath::new();
+    let Some(first) = pts.first() else { return p };
+    p.move_to(*first);
+    for k in 0..pts.len() - 1 {
+        let p0 = pts[k.saturating_sub(1)];
+        let (p1, p2) = (pts[k], pts[k + 1]);
+        let p3 = pts[(k + 2).min(pts.len() - 1)];
+        let c1 = p1 + (p2 - p0) / 6.0;
+        let c2 = p2 - (p3 - p1) / 6.0;
+        p.curve_to(c1, c2, p2);
+    }
+    p
+}
+
 /// A line series' colour: its line's own (where PowerPoint keeps it), else its fill's, else the
 /// palette's.
 fn series_line(ctx: &Ctx, c: &Chart, i: usize, s: &deckcraft_model::chart::Series) -> Rgba {
@@ -418,7 +455,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                     Rect::new(plot.x0 + start, to_axis(sec, b), plot.x0 + start + bar, to_axis(sec, a))
                 };
                 ctx.set_transform(m);
-                ctx.set_paint(color(series_fill(rctx, c, *si, Some(s)), 1.0));
+                ctx.set_paint(color(point_fill(rctx, c, *si, s, i), 1.0));
                 ctx.fill_rect(&r.abs());
                 if c.data_labels {
                     let t = c.data_label(s, s.values.get(i).copied().flatten().unwrap_or(0.0));
@@ -480,14 +517,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         if pts.is_empty() {
             continue;
         }
-        let mut p = BezPath::new();
-        for (k, q) in pts.iter().enumerate() {
-            if k == 0 {
-                p.move_to(*q);
-            } else {
-                p.line_to(*q);
-            }
-        }
+        let p = if s.smooth && !area_kind && pts.len() > 2 { smooth_path(&pts) } else { polyline(&pts) };
         ctx.set_transform(m);
         if area_kind {
             let mut a = p.clone();
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..232352b4 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -155,6 +155,30 @@ fn combo_chart_draws_columns_and_a_line_on_its_own_axis() {
     assert!(col[0] < 250 || col[1] < 250 || col[2] < 250, "no column: {col:?}");
 }
 
+#[test]
+fn column_points_take_their_own_fill_and_smooth_lines_curve() {
+    // One column series where only the middle point is given a red c:dPt fill.
+    let mut c = Chart::sample(ChartType::Column);
+    c.title = None;
+    c.legend = None;
+    c.series.truncate(1);
+    c.categories = vec!["A".into(), "B".into(), "C".into()];
+    c.series[0].values = vec![Some(10.0), Some(10.0), Some(10.0)];
+    c.series[0].point_fills = vec![(1, deckcraft_model::style::Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 0, 0))))];
+    let sh = Shape { id: ShapeId(621), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
+    let img = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    let red = |x: u32| (300..500).any(|y| img.pixel(x, y)[..3] == [255, 0, 0]);
+    assert!(red(480), "the middle column takes its point's fill");
+    assert!(!red(200) && !red(760), "the others keep the series colour");
+
+    // A smoothed line through a peak overshoots no point but leaves the straight chord.
+    let pts = [kurbo::Point::new(0.0, 0.0), kurbo::Point::new(10.0, 10.0), kurbo::Point::new(20.0, 0.0)];
+    let p = crate::chart::smooth_path(&pts);
+    assert_eq!(p.elements().len(), 3, "a cubic per segment");
+    let mid = kurbo::ParamCurve::eval(&p.segments().next().unwrap(), 0.5);
+    assert!(mid.y > mid.x, "the first half bows towards the peak instead of following the chord: {mid:?}");
+}
+
 #[test]
 fn placeholder_prompts_only_in_edit_view() {
     let p = Presentation::default();

From 8e124d32a869a5831de716e3221ad1685415f3db Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:09:16 +0300
Subject: [PATCH 245/376] Charts: clustered bar widths from gap width and
 overlap as fractions of one bar; schema defaults when absent

---
 crates/pptx/src/read/chart.rs |  9 +++++++++
 crates/render/src/chart.rs    | 11 ++++++++---
 crates/render/src/tests.rs    | 19 +++++++++++++++++++
 3 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 0045e4a5..2f306858 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -173,11 +173,18 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
         if let Some(v) = g.child_val("varyColors") {
             c.vary_colors = v == "1" || v == "true";
         }
+        // A bar group without c:gapWidth / c:overlap takes the schema's defaults (150 %, 0 %),
+        // not the 219 % / -27 % PowerPoint writes into its new charts.
+        let bar_group = g.is("barChart") || g.is("bar3DChart");
         if let Some(v) = g.child_val("gapWidth").and_then(|v| v.parse::<f64>().ok()) {
             c.gap_width = (v / 100.0).clamp(0.0, 5.0);
+        } else if bar_group {
+            c.gap_width = 1.5;
         }
         if let Some(v) = g.child_val("overlap").and_then(|v| v.parse::<f64>().ok()) {
             c.overlap = (v / 100.0).clamp(-1.0, 1.0);
+        } else if bar_group {
+            c.overlap = 0.0;
         }
         if let Some(v) = g.child_val("holeSize").and_then(|v| v.parse::<f64>().ok()) {
             c.hole_size = (v / 100.0).clamp(0.0, 0.9);
@@ -392,6 +399,8 @@ mod tests {
         let xml = r#"<c:chartSpace xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><c:chart><c:plotArea><c:barChart><c:barDir val="col"/><c:ser><c:idx val="0"/><c:val><c:numRef><c:numCache><c:ptCount val="1"/><c:pt idx="0"><c:v>1</c:v></c:pt></c:numCache></c:numRef></c:val></c:ser><c:axId val="1"/><c:axId val="2"/></c:barChart><c:catAx><c:axId val="1"/><c:txPr><a:bodyPr/><a:p><a:pPr><a:defRPr sz="1000"><a:solidFill><a:srgbClr val="FFFFFF"/></a:solidFill></a:defRPr></a:pPr></a:p></c:txPr></c:catAx><c:valAx><c:axId val="2"/></c:valAx></c:plotArea></c:chart></c:chartSpace>"#;
         let c = read_chart_xml(xml.as_bytes()).unwrap();
         assert_eq!(c.text_color, Some(deckcraft_model::ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 255, 255))));
+        // No c:gapWidth / c:overlap: the schema's 150 % and 0 %.
+        assert_eq!((c.gap_width, c.overlap), (1.5, 0.0));
     }
 
     #[test]
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index bbdc2330..9b394f71 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -420,10 +420,15 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         let bars: Vec<(usize, &deckcraft_model::chart::Series)> =
             c.series.iter().enumerate().filter(|(_, s)| c.series_kind(s).is_bar_like()).collect();
         let ns = bars.len().max(1);
+        // Gap width and overlap are fractions of one bar's width: a category's band holds its bars
+        // (overlapping by `overlap` of a bar between neighbours) plus one gap.
         let gap = c.gap_width.clamp(0.0, 5.0);
-        let group = band / (1.0 + gap);
         let stacked = bk.stacked();
-        let bar = if stacked { group } else { group / ns as f64 };
+        let ov = if stacked { 1.0 } else { c.overlap.clamp(-1.0, 1.0) };
+        let n = ns as f64;
+        let bar = band / (n - (n - 1.0) * ov + gap);
+        let step = bar * (1.0 - ov);
+        let group = bar + step * (n - 1.0);
         for i in 0..ncat {
             let mut pos_acc = 0.0;
             let mut neg_acc = 0.0;
@@ -435,7 +440,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             for (bi, (si, s)) in bars.iter().enumerate() {
                 let sec = c.on_secondary(s);
                 let v = s.values.get(i).copied().flatten().unwrap_or(0.0) / total;
-                let start = band * i as f64 + (band - group) / 2.0 + if stacked { 0.0 } else { bar * bi as f64 };
+                let start = band * i as f64 + (band - group) / 2.0 + if stacked { 0.0 } else { step * bi as f64 };
                 let (a, b) = if stacked {
                     if v >= 0.0 {
                         let r = (pos_acc, pos_acc + v);
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 232352b4..8409ca5c 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -171,6 +171,25 @@ fn column_points_take_their_own_fill_and_smooth_lines_curve() {
     assert!(red(480), "the middle column takes its point's fill");
     assert!(!red(200) && !red(760), "the others keep the series colour");
 
+    // Two series, gap 150 %, no overlap: each bar is a band / 3.5 wide (PowerPoint's and
+    // LibreOffice's geometry), not band / 2.5 split in two.
+    let mut c = Chart::sample(ChartType::Column);
+    c.title = None;
+    c.legend = None;
+    c.series.truncate(2);
+    c.categories = vec!["A".into()];
+    c.series[0].values = vec![Some(10.0)];
+    c.series[1].values = vec![Some(10.0)];
+    c.series[0].fill = Some(deckcraft_model::style::Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 0, 0))));
+    (c.gap_width, c.overlap) = (1.5, 0.0);
+    let sh = Shape { id: ShapeId(622), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
+    let img = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+    let y = (0..540).rev().find(|y| (0..960).any(|x| img.pixel(x, *y)[..3] == [255, 0, 0])).unwrap() - 5;
+    let reds = (0..960).filter(|x| img.pixel(*x, y)[..3] == [255, 0, 0]).count() as f64;
+    // The plot is ~850 px wide with one category: a bar is ~240 px (it was ~170 when the band
+    // was split as 1 + gap and then shared between the series).
+    assert!((200.0..280.0).contains(&reds), "bar {reds} px");
+
     // A smoothed line through a peak overshoots no point but leaves the straight chord.
     let pts = [kurbo::Point::new(0.0, 0.0), kurbo::Point::new(10.0, 10.0), kurbo::Point::new(20.0, 0.0)];
     let p = crate::chart::smooth_path(&pts);

From ca2af8fe30b1ef9709e6b7ca1b2c49a1a9caf162 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:14:28 +0300
Subject: [PATCH 246/376] Render: cap a stroke's dash count so a tiny dash on a
 huge shape can't abort on open

---
 crates/render/src/lib.rs        | 25 +++++++++++++++++++++++++
 crates/render/src/tests_wild.rs | 28 ++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..b1d9fce0 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -1442,6 +1442,7 @@ pub(crate) fn stroke(
     if let Some(d) = &line.dash {
         let pat: Vec<f64> = d.pattern().iter().map(|v| v * lw.max(0.75)).collect();
         let pat = dash_with_caps(pat, cap, sw);
+        let pat = limit_dash_count(path, pat);
         if !pat.is_empty() && pat.iter().all(|v| *v > 0.0) {
             if cap == kurbo::Cap::Square {
                 sk = sk.with_caps(kurbo::Cap::Butt);
@@ -1582,6 +1583,30 @@ fn dash_with_caps(mut pat: Vec<f64>, cap: kurbo::Cap, width: f64) -> Vec<f64> {
     pat
 }
 
+/// The most dashes one stroke is cut into. Stroking expands every dash into its own outline, so a
+/// tiny dash on a huge shape (a 1 EMU-wide `custDash` on a 2147483647 EMU rectangle) would
+/// otherwise need gigabytes and abort the app when the slide is drawn. Past this count the
+/// pattern is scaled up evenly, which looks the same: the dashes are far below a pixel by then.
+const MAX_DASHES: f64 = 20_000.0;
+
+fn limit_dash_count(path: &BezPath, pat: Vec<f64>) -> Vec<f64> {
+    use kurbo::ParamCurveArclen;
+    let period: f64 = pat.iter().sum();
+    if !(period.is_finite() && period > 0.0) {
+        return pat;
+    }
+    let len: f64 = path.segments().map(|s| s.arclen(1e-2)).sum();
+    let dashes = len / period;
+    if !len.is_finite() {
+        return vec![];
+    }
+    if dashes <= MAX_DASHES {
+        return pat;
+    }
+    let k = dashes / MAX_DASHES;
+    pat.into_iter().map(|v| v * k).collect()
+}
+
 fn end_points(path: &BezPath) -> Option<((Point, Point), (Point, Point))> {
     let els: Vec<PathEl> = path.elements().to_vec();
     let mut pts: Vec<Point> = vec![];
diff --git a/crates/render/src/tests_wild.rs b/crates/render/src/tests_wild.rs
index 7e7f0eac..672e7dcd 100644
--- a/crates/render/src/tests_wild.rs
+++ b/crates/render/src/tests_wild.rs
@@ -744,3 +744,31 @@ fn a_3d_shapes_face_is_lit_even_without_a_bevel() {
     let img = render(vec![shape(r#"<a:scene3d><a:camera prst="orthographicFront"/><a:lightRig rig="threePt" dir="t"/></a:scene3d>"#)]);
     assert!(close(img.pixel(175, 150), base, 1));
 }
+
+#[test]
+fn a_tiny_dash_on_a_huge_shape_draws_without_running_out_of_memory() {
+    // Found by fuzzing the pptx round trip: a 1 EMU `custDash` on a 2147483647 EMU square asked
+    // the stroker for hundreds of thousands of dashes and aborted on a 7.5 GB allocation.
+    let sh = Shape {
+        id: ShapeId(12),
+        xfrm: Some(Xfrm::new(0.0, 0.0, 169_093.0, 169_093.0)),
+        geom: Geom::preset("rect"),
+        line: Some(Line {
+            fill: solid(RED),
+            width: Some(0.0001),
+            dash: Some(deckcraft_model::style::Dash::Custom { pattern: vec![(1.0, 1.0)] }),
+            ..Default::default()
+        }),
+        ..Default::default()
+    };
+    let img = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 0.25, ..Default::default() });
+    assert!(img.width > 0);
+    // The pattern is scaled up only past the limit; ordinary lines keep theirs.
+    let mut p = BezPath::new();
+    p.move_to((0.0, 0.0));
+    p.line_to((100.0, 0.0));
+    assert_eq!(limit_dash_count(&p, vec![1.0, 1.0]), vec![1.0, 1.0]);
+    p.line_to((4.0e6, 0.0));
+    let pat = limit_dash_count(&p, vec![1.0, 1.0]);
+    assert!((4.0e6 / (pat[0] + pat[1]) - MAX_DASHES).abs() < 1.0, "{pat:?}");
+}

From 71b02327cfdfdaf337fa1f582be340a5898b4f36 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:16:35 +0300
Subject: [PATCH 247/376] Charts: category axis orientation (maxMin) read,
 written and drawn; horizontal bars run bottom-up

---
 crates/model/src/chart.rs      |  4 ++++
 crates/pptx/src/read/chart.rs  |  8 ++++++++
 crates/pptx/src/read/mod.rs    |  2 +-
 crates/pptx/src/write/chart.rs | 18 +++++++++++++++++-
 crates/render/src/chart.rs     | 12 ++++++++----
 crates/render/src/tests.rs     | 20 ++++++++++++++++++++
 6 files changed, 58 insertions(+), 6 deletions(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index aebee497..49f16c63 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -178,6 +178,9 @@ pub struct Chart {
     pub y_format: Option<String>,
     /// The value axis is deleted (`c:delete`): no labels, though gridlines may stay.
     pub y_hidden: bool,
+    /// The category axis runs backwards (`c:orientation val="maxMin"`): right to left, or on a
+    /// horizontal bar chart top to bottom (the default puts the first category at the bottom).
+    pub cat_reversed: bool,
     /// A combo chart's secondary value axis: bounds, major unit and number format.
     pub y2_min: Option<f64>,
     pub y2_max: Option<f64>,
@@ -219,6 +222,7 @@ impl Default for Chart {
             y_major: None,
             y_format: None,
             y_hidden: false,
+            cat_reversed: false,
             y2_min: None,
             y2_max: None,
             y2_major: None,
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 2f306858..63ee3125 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -282,6 +282,7 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
         c.y_hidden = deleted(v);
     }
     if let Some(a) = cat_ax {
+        c.cat_reversed = a.child("scaling").and_then(|s| s.child_val("orientation")).is_some_and(|o| o == "maxMin");
         c.axis_titles.0 = a.child("title").map(|t| rich_text(t).unwrap_or_else(|| "Axis Title".into()));
     }
     // Text sizes as the file sets them (PowerPoint draws chart text at these sizes, not scaled to
@@ -399,6 +400,13 @@ mod tests {
         let xml = r#"<c:chartSpace xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><c:chart><c:plotArea><c:barChart><c:barDir val="col"/><c:ser><c:idx val="0"/><c:val><c:numRef><c:numCache><c:ptCount val="1"/><c:pt idx="0"><c:v>1</c:v></c:pt></c:numCache></c:numRef></c:val></c:ser><c:axId val="1"/><c:axId val="2"/></c:barChart><c:catAx><c:axId val="1"/><c:txPr><a:bodyPr/><a:p><a:pPr><a:defRPr sz="1000"><a:solidFill><a:srgbClr val="FFFFFF"/></a:solidFill></a:defRPr></a:pPr></a:p></c:txPr></c:catAx><c:valAx><c:axId val="2"/></c:valAx></c:plotArea></c:chart></c:chartSpace>"#;
         let c = read_chart_xml(xml.as_bytes()).unwrap();
         assert_eq!(c.text_color, Some(deckcraft_model::ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 255, 255))));
+        assert!(!c.cat_reversed);
+        let rev = read_chart_xml(
+            xml.replace("<c:catAx><c:axId val=\"1\"/>", "<c:catAx><c:axId val=\"1\"/><c:scaling><c:orientation val=\"maxMin\"/></c:scaling>")
+                .as_bytes(),
+        )
+        .unwrap();
+        assert!(rev.cat_reversed, "maxMin reverses the category axis");
         // No c:gapWidth / c:overlap: the schema's 150 % and 0 %.
         assert_eq!((c.gap_width, c.overlap), (1.5, 0.0));
     }
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..9a8b305d 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -1,6 +1,6 @@
 //! PPTX import: package → [`Presentation`].
 
-mod chart;
+pub(crate) mod chart;
 pub(crate) mod dml;
 mod shapes;
 mod theme;
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 76567c9e..b1125d2c 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -251,7 +251,7 @@ fn axes(w: &mut W, c: &Chart, g: Group) {
         w.open0("c:catAx");
         w.val("c:axId", AX_CAT);
         w.open0("c:scaling");
-        w.val("c:orientation", "minMax");
+        w.val("c:orientation", if c.cat_reversed { "maxMin" } else { "minMax" });
         w.close("c:scaling");
         w.val("c:delete", 0);
         w.val("c:axPos", cat_pos);
@@ -479,3 +479,19 @@ pub fn chart_xml(c: &Chart) -> Vec<u8> {
     w.close("c:chartSpace");
     w.finish()
 }
+
+#[cfg(test)]
+mod tests {
+    use deckcraft_model::chart::{Chart, ChartType};
+
+    #[test]
+    fn reversed_category_axis_round_trips() {
+        let mut c = Chart::sample(ChartType::Bar);
+        c.cat_reversed = true;
+        let xml = super::chart_xml(&c);
+        assert!(String::from_utf8_lossy(&xml).contains(r#"<c:orientation val="maxMin"/>"#));
+        assert!(crate::read::chart::read_chart_xml(&xml).unwrap().cat_reversed);
+        c.cat_reversed = false;
+        assert!(!crate::read::chart::read_chart_xml(&super::chart_xml(&c)).unwrap().cat_reversed);
+    }
+}
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index 9b394f71..20dae6b4 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -382,10 +382,14 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     }
     let ncat = c.categories.len().max(c.series.iter().map(|s| s.values.len()).max().unwrap_or(0)).max(1);
     let band = if horiz { plot.height() / ncat as f64 } else { plot.width() / ncat as f64 };
+    // Where category `i`'s band starts along its axis: left to right, or bottom to top on a
+    // horizontal bar chart, unless the axis is reversed.
+    let backwards = horiz != c.cat_reversed;
+    let slot = |i: usize| if backwards { ncat.saturating_sub(i + 1) as f64 } else { i as f64 };
     // Category labels: wrapped onto two lines when they don't fit their band (long date ranges).
     let wraps = !horiz && c.categories.iter().any(|n| n.chars().count() as f64 * base * 0.5 > band);
     for (i, name) in c.categories.iter().enumerate() {
-        let mid = if horiz { plot.y0 + band * (i as f64 + 0.5) } else { plot.x0 + band * (i as f64 + 0.5) };
+        let mid = if horiz { plot.y0 + band * (slot(i) + 0.5) } else { plot.x0 + band * (slot(i) + 0.5) };
         if horiz {
             label(
                 ctx,
@@ -440,7 +444,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             for (bi, (si, s)) in bars.iter().enumerate() {
                 let sec = c.on_secondary(s);
                 let v = s.values.get(i).copied().flatten().unwrap_or(0.0) / total;
-                let start = band * i as f64 + (band - group) / 2.0 + if stacked { 0.0 } else { step * bi as f64 };
+                let start = band * slot(i) + (band - group) / 2.0 + if stacked { 0.0 } else { step * bi as f64 };
                 let (a, b) = if stacked {
                     if v >= 0.0 {
                         let r = (pos_acc, pos_acc + v);
@@ -513,9 +517,9 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                     let xs: Vec<f64> = s.x_values.iter().flatten().copied().collect();
                     let (xl, xh) = (xs.iter().copied().fold(f64::MAX, f64::min), xs.iter().copied().fold(f64::MIN, f64::max));
                     let xv = s.x_values.get(i).copied().flatten().unwrap_or(i as f64);
-                    if xh > xl { plot.x0 + (xv - xl) / (xh - xl) * plot.width() } else { plot.x0 + band * (i as f64 + 0.5) }
+                    if xh > xl { plot.x0 + (xv - xl) / (xh - xl) * plot.width() } else { plot.x0 + band * (slot(i) + 0.5) }
                 }
-                _ => plot.x0 + band * (i as f64 + 0.5),
+                _ => plot.x0 + band * (slot(i) + 0.5),
             };
             pts.push(Point::new(x, to_axis(sec, v)));
         }
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 8409ca5c..1743f873 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -198,6 +198,26 @@ fn column_points_take_their_own_fill_and_smooth_lines_curve() {
     assert!(mid.y > mid.x, "the first half bows towards the peak instead of following the chord: {mid:?}");
 }
 
+#[test]
+fn horizontal_bars_list_the_first_category_at_the_bottom_unless_reversed() {
+    let draw = |reversed: bool| {
+        let mut c = Chart::sample(ChartType::Bar);
+        c.title = None;
+        c.legend = None;
+        c.series.truncate(1);
+        c.categories = vec!["A".into(), "B".into(), "C".into()];
+        c.series[0].values = vec![Some(10.0), Some(10.0), Some(10.0)];
+        c.series[0].point_fills = vec![(0, deckcraft_model::style::Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 0, 0))))];
+        c.cat_reversed = reversed;
+        let sh = Shape { id: ShapeId(623), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
+        let img = render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() });
+        let rows: Vec<u32> = (0..540).filter(|y| (0..960).any(|x| img.pixel(x, *y)[..3] == [255, 0, 0])).collect();
+        (rows[0] + rows[rows.len() - 1]) / 2
+    };
+    assert!(draw(false) > 360, "first category at the bottom: {}", draw(false));
+    assert!(draw(true) < 180, "reversed: first category at the top: {}", draw(true));
+}
+
 #[test]
 fn placeholder_prompts_only_in_edit_view() {
     let p = Presentation::default();

From bd017b861d0550429409c4751aed2dfbd2802b2f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:20:35 +0300
Subject: [PATCH 248/376] UI: Size and Position dialog sets geometry in one
 step
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Shape Format › Size and the shape menu open a dialog for position,
size, rotation, scale and lock aspect ratio. One command writes them
together, so undo restores the whole change.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                                |   4 +-
 crates/engine/src/cmd/shape.rs            | 285 ++++++++++++++++++++++
 crates/ui-egui/src/canvas.rs              |   4 +
 crates/ui-egui/src/dialogs.rs             | 245 +++++++++++++++++++
 crates/ui-egui/src/menus.rs               |   1 +
 crates/ui-egui/src/ribbon.rs              |   3 +
 crates/ui-egui/src/size_position_tests.rs |  73 ++++++
 docs/architecture.md                      |   7 +-
 docs/gaps.md                              |   7 +-
 docs/target-app-parity.md                 |   5 +-
 docs/ui-parity.md                         |   7 +-
 11 files changed, 629 insertions(+), 12 deletions(-)
 create mode 100644 crates/ui-egui/src/size_position_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..05bcab00 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Size and Position dialog; breadth stays 79%, ready stays ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Size and Position dialog: height, width, rotation, scale and lock aspect ratio in one undo step, from Shape Format › Size and the shape menu. Breadth stays 79% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Size and Position dialog. Breadth stays 79%, ready stays ~55% |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..bd0e40b3 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -34,6 +34,15 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("shape.resize", "Size", ["Shape Format", "Size"], None, "{w?, h?: pt, lockAspect?: bool, ids?}", has_selection, resize),
         cmd!("shape.setBounds", "Position and Size", [], None, "{x, y, w, h, ids?}", has_selection, set_bounds),
         cmd!("shape.rotate", "Rotation", ["Shape Format", "Arrange", "Rotate"], None, "{deg?: absolute, by?: relative, ids?}", has_selection, rotate),
+        cmd!(
+            "shape.sizePosition",
+            "Size and Position…",
+            ["Shape Format", "Size"],
+            None,
+            "{x?, y?: pt, w?, h?: pt, rot?: deg, scaleW?, scaleH?: percent of the current size (100 = unchanged), lockAspect?: bool, ids?} — with none of those keys, opens the dialog",
+            has_selection,
+            size_position
+        ),
         cmd!("shape.flip", "Flip", ["Shape Format", "Arrange", "Rotate"], None, "{axis: horizontal|vertical, ids?}", has_selection, flip),
         cmd!("shape.adjust", "Adjust Shape", [], None, "{index, value (file units), ids?}", has_selection, adjust),
         cmd!("shape.change", "Change Shape", ["Shape Format", "Insert Shapes", "Edit Shape"], None, "{preset, ids?}", has_selection, change),
@@ -173,6 +182,159 @@ fn set_bounds(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
+const SIZE_POS: &str = "shape.sizePosition";
+/// Smallest and largest side the dialog will write, in points (220 in).
+const MIN_PT: f64 = 0.01;
+const MAX_PT: f64 = 15_840.0;
+const POS_LIMIT: f64 = 100_000.0;
+const MAX_SCALE: f64 = 10_000.0;
+
+#[derive(Clone, Copy)]
+struct SizeSpec {
+    x: Option<f64>,
+    y: Option<f64>,
+    w: Option<f64>,
+    h: Option<f64>,
+    rot: Option<f64>,
+    scale_w: Option<f64>,
+    scale_h: Option<f64>,
+    lock: bool,
+}
+
+impl SizeSpec {
+    fn width_set(self) -> bool {
+        self.w.is_some() || self.scale_w.is_some()
+    }
+    fn height_set(self) -> bool {
+        self.h.is_some() || self.scale_h.is_some()
+    }
+    fn any(self) -> bool {
+        self.x.is_some() || self.y.is_some() || self.width_set() || self.height_set() || self.rot.is_some()
+    }
+}
+
+fn finite_key(p: &Value, key: &str) -> Result<Option<f64>> {
+    match p.get(key) {
+        None | Some(Value::Null) => Ok(None),
+        Some(v) => match v.as_f64() {
+            Some(n) if n.is_finite() => Ok(Some(n)),
+            _ => Err(bad(SIZE_POS, format!("`{key}` must be a finite number"))),
+        },
+    }
+}
+
+fn in_range(v: Option<f64>, key: &str, lo: f64, hi: f64) -> Result<Option<f64>> {
+    if let Some(n) = v
+        && !(lo..=hi).contains(&n)
+    {
+        return Err(bad(SIZE_POS, format!("`{key}` is out of range")));
+    }
+    Ok(v)
+}
+
+fn size_spec(p: &Value) -> Result<SizeSpec> {
+    let lock = match p.get("lockAspect") {
+        None | Some(Value::Null) => false,
+        Some(Value::Bool(b)) => *b,
+        Some(_) => return Err(bad(SIZE_POS, "`lockAspect` must be true or false")),
+    };
+    Ok(SizeSpec {
+        x: in_range(finite_key(p, "x")?, "x", -POS_LIMIT, POS_LIMIT)?,
+        y: in_range(finite_key(p, "y")?, "y", -POS_LIMIT, POS_LIMIT)?,
+        w: in_range(finite_key(p, "w")?, "w", MIN_PT, MAX_PT)?,
+        h: in_range(finite_key(p, "h")?, "h", MIN_PT, MAX_PT)?,
+        rot: finite_key(p, "rot")?,
+        scale_w: in_range(finite_key(p, "scaleW")?, "scaleW", f64::MIN_POSITIVE, MAX_SCALE)?,
+        scale_h: in_range(finite_key(p, "scaleH")?, "scaleH", f64::MIN_POSITIVE, MAX_SCALE)?,
+        lock,
+    })
+}
+
+fn norm_deg(r: f64) -> f64 {
+    let r = r % 360.0;
+    if r < 0.0 { r + 360.0 } else { r }
+}
+
+/// Width wins when both sides are set with the aspect locked, matching `shape.resize`.
+fn apply_size(x: &mut deckcraft_geom::Xfrm, spec: SizeSpec) {
+    let ar = if x.h > 0.0 { x.w / x.h } else { 1.0 };
+    let mut nw = x.w;
+    let mut nh = x.h;
+    if let Some(p) = spec.scale_w {
+        nw = x.w * p / 100.0;
+    }
+    if let Some(p) = spec.scale_h {
+        nh = x.h * p / 100.0;
+    }
+    if let Some(w) = spec.w {
+        nw = w;
+    }
+    if let Some(h) = spec.h {
+        nh = h;
+    }
+    if spec.lock && (spec.width_set() || spec.height_set()) {
+        if spec.width_set() {
+            nh = if ar > 0.0 { nw / ar } else { nh };
+        } else {
+            nw = nh * ar;
+        }
+    }
+    x.w = nw.clamp(MIN_PT, MAX_PT);
+    x.h = nh.clamp(MIN_PT, MAX_PT);
+    if let Some(px) = spec.x {
+        x.x = px;
+    }
+    if let Some(py) = spec.y {
+        x.y = py;
+    }
+    if let Some(r) = spec.rot {
+        x.rot = norm_deg(r);
+    }
+}
+
+fn size_position(s: &mut Session, p: &Value) -> Result<Value> {
+    let spec = size_spec(p)?;
+    if !spec.any() {
+        let (x, y, w, h, rot) = {
+            let st = s.doc()?;
+            let id = targets(s, p)?.first().copied().ok_or_else(|| bad(SIZE_POS, "nothing selected"))?;
+            let sh = st.shape(id).ok_or_else(|| bad(SIZE_POS, "no such shape"))?;
+            let x = xfrm_of(&st.doc, &st.selection, sh);
+            (x.x, x.y, x.w, x.h, x.rot)
+        };
+        s.ui_requests.push(crate::UiRequest::Dialog {
+            id: "sizePosition".into(),
+            params: json!({"x": x, "y": y, "w": w, "h": h, "rot": rot, "scaleW": 100.0, "scaleH": 100.0, "lockAspect": false}),
+        });
+        return Ok(Value::Null);
+    }
+    let changed = {
+        let ids = targets(s, p)?;
+        let st = s.doc()?;
+        let free: Vec<_> = ids.iter().copied().filter(|id| !st.shape(*id).is_some_and(|sh| sh.locked)).collect::<Vec<_>>();
+        if !ids.is_empty() && free.is_empty() {
+            return Err(bad(SIZE_POS, "the object is locked"));
+        }
+        free.iter().any(|id| {
+            st.shape(*id).is_some_and(|sh| {
+                let mut x = xfrm_of(&st.doc, &st.selection, sh);
+                let before = x;
+                apply_size(&mut x, spec);
+                x != before
+            })
+        })
+    };
+    if !changed {
+        return Ok(Value::Null);
+    }
+    edit_geometry(s, p, SIZE_POS, |sh| {
+        if let Some(x) = sh.xfrm.as_mut() {
+            apply_size(x, spec);
+        }
+        Ok(())
+    })
+}
+
 fn rotate(s: &mut Session, p: &Value) -> Result<Value> {
     let (abs, by) = (f64_param(p, "deg"), f64_param(p, "by"));
     edit_geometry(s, p, "shape.rotate", |sh| {
@@ -860,3 +1022,126 @@ fn freeform(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     Ok(json!({"id": id.0}))
 }
+
+#[cfg(test)]
+mod size_position_tests {
+    use serde_json::json;
+
+    use crate::Session;
+
+    fn deck() -> (Session, u32) {
+        let mut s = Session::with_new();
+        s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+        let id = s.execute("shape.insert", &json!({"preset": "rect", "rect": [40.0, 50.0, 200.0, 100.0]})).unwrap()["id"].as_u64().unwrap() as u32;
+        (s, id)
+    }
+
+    fn geom(s: &mut Session, id: u32) -> (f64, f64, f64, f64, f64) {
+        let v = s.execute("shape.inspect", &json!({"id": id})).unwrap();
+        let b = &v["box"];
+        (b["x"].as_f64().unwrap(), b["y"].as_f64().unwrap(), b["w"].as_f64().unwrap(), b["h"].as_f64().unwrap(), b["rot"].as_f64().unwrap_or(0.0))
+    }
+
+    fn undos(s: &Session) -> usize {
+        s.doc().unwrap().history.undo.len()
+    }
+
+    #[test]
+    fn sets_position_size_and_rotation_in_one_undo() {
+        let (mut s, id) = deck();
+        let n = undos(&s);
+        s.execute("shape.sizePosition", &json!({"x": 80.0, "y": 90.0, "w": 240.0, "h": 60.0, "rot": 370.0})).unwrap();
+        assert_eq!(geom(&mut s, id), (80.0, 90.0, 240.0, 60.0, 10.0));
+        assert_eq!(undos(&s), n + 1);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Size and Position…");
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(geom(&mut s, id), (40.0, 50.0, 200.0, 100.0, 0.0));
+    }
+
+    #[test]
+    fn lock_aspect_and_scale_share_one_step() {
+        let (mut s, id) = deck();
+        s.execute("shape.sizePosition", &json!({"w": 300.0, "lockAspect": true})).unwrap();
+        assert_eq!(geom(&mut s, id), (40.0, 50.0, 300.0, 150.0, 0.0));
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("shape.sizePosition", &json!({"h": 50.0, "lockAspect": true})).unwrap();
+        assert_eq!(geom(&mut s, id), (40.0, 50.0, 100.0, 50.0, 0.0));
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("shape.sizePosition", &json!({"scaleW": 25.0, "scaleH": 150.0})).unwrap();
+        assert_eq!(geom(&mut s, id), (40.0, 50.0, 50.0, 150.0, 0.0));
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("shape.sizePosition", &json!({"scaleH": 50.0, "lockAspect": true})).unwrap();
+        assert_eq!(geom(&mut s, id), (40.0, 50.0, 100.0, 50.0, 0.0));
+        // An explicit width wins over a scale on the same axis.
+        s.execute("shape.sizePosition", &json!({"w": 80.0, "scaleW": 50.0})).unwrap();
+        assert_eq!(geom(&mut s, id).2, 80.0);
+    }
+
+    #[test]
+    fn partial_fields_leave_the_rest_and_a_repeat_does_not_undo() {
+        let (mut s, id) = deck();
+        let n = undos(&s);
+        s.execute("shape.sizePosition", &json!({"y": 12.0, "rot": -90.0})).unwrap();
+        assert_eq!(geom(&mut s, id), (40.0, 12.0, 200.0, 100.0, 270.0));
+        assert_eq!(undos(&s), n + 1);
+        let n = undos(&s);
+        s.execute("shape.sizePosition", &json!({"x": 40.0, "y": 12.0, "w": 200.0, "h": 100.0, "rot": 270.0})).unwrap();
+        assert_eq!(undos(&s), n, "identical geometry is not an undo step");
+    }
+
+    #[test]
+    fn no_fields_opens_the_dialog_without_editing() {
+        let (mut s, id) = deck();
+        let n = undos(&s);
+        s.execute("shape.sizePosition", &json!({})).unwrap();
+        assert_eq!(geom(&mut s, id), (40.0, 50.0, 200.0, 100.0, 0.0));
+        assert_eq!(undos(&s), n);
+        let req = s.ui_requests.last().unwrap();
+        match req {
+            crate::UiRequest::Dialog { id, params } => {
+                assert_eq!(id, "sizePosition");
+                assert_eq!(params["w"], 200.0);
+                assert_eq!(params["h"], 100.0);
+                assert_eq!(params["x"], 40.0);
+                assert_eq!(params["rot"], 0.0);
+                assert_eq!(params["scaleW"], 100.0);
+                assert_eq!(params["lockAspect"], false);
+            }
+            other => panic!("expected a dialog, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn bad_fields_do_not_edit() {
+        let (mut s, id) = deck();
+        let n = undos(&s);
+        for p in [
+            json!({"w": "wide"}),
+            json!({"h": -5.0}),
+            json!({"scaleW": 0.0}),
+            json!({"x": 1e9}),
+            json!({"rot": "spin"}),
+            json!({"lockAspect": "yes"}),
+        ] {
+            let err = s.execute("shape.sizePosition", &p).unwrap_err();
+            assert!(err.to_string().contains("sizePosition"), "{err}");
+            assert_eq!(geom(&mut s, id), (40.0, 50.0, 200.0, 100.0, 0.0));
+            assert_eq!(undos(&s), n);
+        }
+    }
+
+    #[test]
+    fn scale_is_per_shape_and_nothing_selected_is_disabled() {
+        let (mut s, a) = deck();
+        let b = s.execute("shape.insert", &json!({"preset": "ellipse", "rect": [10.0, 10.0, 40.0, 80.0]})).unwrap()["id"].as_u64().unwrap() as u32;
+        s.execute("shape.sizePosition", &json!({"ids": [a, b], "scaleW": 200.0})).unwrap();
+        assert_eq!(geom(&mut s, a).2, 400.0);
+        assert_eq!(geom(&mut s, a).3, 100.0);
+        assert_eq!(geom(&mut s, b).2, 80.0);
+        assert_eq!(geom(&mut s, b).3, 80.0);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Size and Position…");
+        s.execute("edit.select", &json!({"ids": []})).unwrap();
+        let err = s.execute("shape.sizePosition", &json!({})).unwrap_err();
+        assert!(err.to_string().contains("nothing selected"), "{err}");
+    }
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..e694ef2f 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -664,6 +664,10 @@ fn context_menu(app: &mut SlideApp, resp: &egui::Response) {
                 let _ = app.run("shape.setDefault", json!({}));
                 ui.close();
             }
+            if ui.button("Size and Position…").clicked() {
+                let _ = app.run("shape.sizePosition", json!({}));
+                ui.close();
+            }
             if ui.button("Format Shape…").clicked() {
                 let _ = app.run("view.pane", json!({"pane": "format"}));
                 ui.close();
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..172802ac 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -32,6 +32,7 @@ fn title(id: &str) -> &'static str {
     match id {
         "table" => "Insert Table",
         "slideSize" => "Slide Size",
+        "sizePosition" => "Size and Position",
         "headerFooter" => "Header and Footer",
         "hyperlink" => "Insert Hyperlink",
         "setupShow" => "Set Up Slide Show",
@@ -156,6 +157,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             }
             ok || cancel
         }
+        "sizePosition" => size_position_dialog(app, ui, d),
         "headerFooter" => {
             let hf = app.session.active().map(|s| s.doc.header_footer.clone()).unwrap_or_default();
             let date = check(ui, d, "Date and time", "date", hf.date);
@@ -738,6 +740,245 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     }
 }
 
+fn num_text(v: f64) -> String {
+    crate::widgets::fmt_num(v, "")
+}
+
+fn field_of(d: &Dialog, key: &str) -> String {
+    d.fields.get(key).cloned().unwrap_or_default()
+}
+
+fn parse_shown(s: &str) -> Option<f64> {
+    let t = s.trim().trim_end_matches(['%', '"']).trim();
+    if t.is_empty() {
+        return None;
+    }
+    t.parse().ok().filter(|v: &f64| v.is_finite())
+}
+
+fn put_dim(d: &mut Dialog, key: &str, exact: f64, shown: String) {
+    d.fields.insert(key.into(), shown.clone());
+    d.fields.insert(format!("seed{key}"), shown.clone());
+    d.fields.insert(format!("prev{key}"), shown);
+    d.fields.insert(format!("{key}Pt"), exact.to_string());
+}
+
+fn publish_dim(d: &mut Dialog, key: &str, exact: f64, shown: String) {
+    d.fields.insert(key.into(), shown.clone());
+    d.fields.insert(format!("seed{key}"), shown);
+    d.fields.insert(format!("{key}Pt"), exact.to_string());
+}
+
+fn edited(d: &Dialog, key: &str) -> bool {
+    field_of(d, key) != field_of(d, &format!("seed{key}"))
+}
+
+fn exact_of(d: &Dialog, key: &str) -> Option<f64> {
+    parse_shown(&field_of(d, &format!("{key}Pt")))
+}
+
+fn selection_xfrm(app: &SlideApp) -> Option<deckcraft_geom::Xfrm> {
+    let st = app.session.active()?;
+    let id = *st.selection.shapes.first()?;
+    let sh = st.shape(id)?;
+    Some(deckcraft_engine::cmd::xfrm_of(&st.doc, &st.selection, sh))
+}
+
+fn seed_size_position(app: &SlideApp, d: &mut Dialog) {
+    if d.fields.contains_key("baseW") {
+        return;
+    }
+    let num = |k: &str| d.params.get(k).and_then(Value::as_f64).filter(|v| v.is_finite());
+    let sel = selection_xfrm(app);
+    let x = num("x").or_else(|| sel.map(|b| b.x)).unwrap_or(0.0);
+    let y = num("y").or_else(|| sel.map(|b| b.y)).unwrap_or(0.0);
+    let w = num("w").or_else(|| sel.map(|b| b.w)).unwrap_or(72.0);
+    let h = num("h").or_else(|| sel.map(|b| b.h)).unwrap_or(72.0);
+    let rot = num("rot").or_else(|| sel.map(|b| b.rot)).unwrap_or(0.0);
+    let sw = num("scaleW").unwrap_or(100.0);
+    let sh = num("scaleH").unwrap_or(100.0);
+    let lock = d.params.get("lockAspect").and_then(Value::as_bool).unwrap_or(false);
+    put_dim(d, "x", x, num_text(x / 72.0));
+    put_dim(d, "y", y, num_text(y / 72.0));
+    put_dim(d, "w", w, num_text(w / 72.0));
+    put_dim(d, "h", h, num_text(h / 72.0));
+    put_dim(d, "rot", rot, num_text(rot));
+    put_dim(d, "scaleW", sw, num_text(sw));
+    put_dim(d, "scaleH", sh, num_text(sh));
+    d.fields.insert("baseW".into(), w.to_string());
+    d.fields.insert("baseH".into(), h.to_string());
+    let bit = if lock { "1" } else { "0" };
+    d.fields.insert("lock".into(), bit.into());
+    d.fields.insert("prevlock".into(), bit.into());
+}
+
+fn scale_of(pt: f64, base: f64) -> f64 {
+    if base > 0.0 { pt / base * 100.0 } else { 100.0 }
+}
+
+fn current_points(d: &Dialog, key: &str) -> Option<f64> {
+    if edited(d, key) { parse_shown(&field_of(d, key)).map(|inches| inches * 72.0) } else { exact_of(d, key) }
+}
+
+/// Keep scale tied to size, and the other side tied when aspect is locked.
+fn reconcile_size_fields(d: &mut Dialog) {
+    let lock = field_of(d, "lock") == "1";
+    let was_locked = field_of(d, "prevlock") == "1";
+    let base_w = parse_shown(&field_of(d, "baseW")).unwrap_or(1.0);
+    let base_h = parse_shown(&field_of(d, "baseH")).unwrap_or(1.0);
+    let ar = if base_h > 0.0 { base_w / base_h } else { 1.0 };
+    let (w_s, h_s, sw_s, sh_s) = (field_of(d, "w"), field_of(d, "h"), field_of(d, "scaleW"), field_of(d, "scaleH"));
+    let (prev_w, prev_h, prev_sw, prev_sh) = (field_of(d, "prevw"), field_of(d, "prevh"), field_of(d, "prevscaleW"), field_of(d, "prevscaleH"));
+    if w_s != prev_w {
+        if let Some(inches) = parse_shown(&w_s) {
+            let w_pt = inches * 72.0;
+            d.fields.insert("wPt".into(), w_pt.to_string());
+            let pct = scale_of(w_pt, base_w);
+            publish_dim(d, "scaleW", pct, num_text(pct));
+            if lock {
+                let h_pt = if ar > 0.0 { w_pt / ar } else { w_pt };
+                publish_dim(d, "h", h_pt, num_text(h_pt / 72.0));
+                let hp = scale_of(h_pt, base_h);
+                publish_dim(d, "scaleH", hp, num_text(hp));
+            }
+        }
+    } else if h_s != prev_h {
+        if let Some(inches) = parse_shown(&h_s) {
+            let h_pt = inches * 72.0;
+            d.fields.insert("hPt".into(), h_pt.to_string());
+            let pct = scale_of(h_pt, base_h);
+            publish_dim(d, "scaleH", pct, num_text(pct));
+            if lock {
+                let w_pt = h_pt * ar;
+                publish_dim(d, "w", w_pt, num_text(w_pt / 72.0));
+                let wp = scale_of(w_pt, base_w);
+                publish_dim(d, "scaleW", wp, num_text(wp));
+            }
+        }
+    } else if sw_s != prev_sw {
+        if let Some(pct) = parse_shown(&sw_s) {
+            let w_pt = base_w * pct / 100.0;
+            d.fields.insert("scaleWPt".into(), pct.to_string());
+            publish_dim(d, "w", w_pt, num_text(w_pt / 72.0));
+            if lock {
+                let h_pt = if ar > 0.0 { w_pt / ar } else { w_pt };
+                publish_dim(d, "h", h_pt, num_text(h_pt / 72.0));
+                publish_dim(d, "scaleH", pct, num_text(pct));
+            }
+        }
+    } else if sh_s != prev_sh {
+        if let Some(pct) = parse_shown(&sh_s) {
+            let h_pt = base_h * pct / 100.0;
+            d.fields.insert("scaleHPt".into(), pct.to_string());
+            publish_dim(d, "h", h_pt, num_text(h_pt / 72.0));
+            if lock {
+                let w_pt = h_pt * ar;
+                publish_dim(d, "w", w_pt, num_text(w_pt / 72.0));
+                publish_dim(d, "scaleW", pct, num_text(pct));
+            }
+        }
+    } else if lock
+        && !was_locked
+        && let Some(w_pt) = current_points(d, "w")
+    {
+        let h_pt = if ar > 0.0 { w_pt / ar } else { w_pt };
+        publish_dim(d, "h", h_pt, num_text(h_pt / 72.0));
+        let hp = scale_of(h_pt, base_h);
+        publish_dim(d, "scaleH", hp, num_text(hp));
+        let wp = scale_of(w_pt, base_w);
+        publish_dim(d, "scaleW", wp, num_text(wp));
+    }
+    for key in ["x", "y", "w", "h", "rot", "scaleW", "scaleH"] {
+        let v = field_of(d, key);
+        d.fields.insert(format!("prev{key}"), v);
+    }
+    d.fields.insert("prevlock".into(), if lock { "1".into() } else { "0".into() });
+}
+
+fn shown_points(d: &Dialog, key: &str, label: &str) -> Result<f64, String> {
+    if edited(d, key) {
+        let n = parse_shown(&field_of(d, key)).ok_or_else(|| format!("{label} must be a number"))?;
+        return Ok(n * 72.0);
+    }
+    exact_of(d, key).ok_or_else(|| format!("{label} must be a number"))
+}
+
+fn shown_number(d: &Dialog, key: &str, label: &str) -> Result<f64, String> {
+    if edited(d, key) {
+        return parse_shown(&field_of(d, key)).ok_or_else(|| format!("{label} must be a number"));
+    }
+    exact_of(d, key).ok_or_else(|| format!("{label} must be a number"))
+}
+
+fn size_position_value(d: &Dialog) -> Result<Value, String> {
+    let x = shown_points(d, "x", "Horizontal")?;
+    let y = shown_points(d, "y", "Vertical")?;
+    let rot = shown_number(d, "rot", "Rotation")?;
+    let base_w = parse_shown(&field_of(d, "baseW")).unwrap_or(1.0);
+    let base_h = parse_shown(&field_of(d, "baseH")).unwrap_or(1.0);
+    let mut w = if edited(d, "w") {
+        shown_points(d, "w", "Width")?
+    } else if edited(d, "scaleW") {
+        base_w * shown_number(d, "scaleW", "Scale width")? / 100.0
+    } else {
+        shown_points(d, "w", "Width")?
+    };
+    let mut h = if edited(d, "h") {
+        shown_points(d, "h", "Height")?
+    } else if edited(d, "scaleH") {
+        base_h * shown_number(d, "scaleH", "Scale height")? / 100.0
+    } else {
+        shown_points(d, "h", "Height")?
+    };
+    if field_of(d, "lock") == "1" {
+        let ar = if base_h > 0.0 { base_w / base_h } else { 1.0 };
+        let width_drives = edited(d, "w") || edited(d, "scaleW") || (!edited(d, "h") && !edited(d, "scaleH"));
+        if width_drives {
+            h = if ar > 0.0 { w / ar } else { h };
+        } else {
+            w = h * ar;
+        }
+    }
+    Ok(json!({"x": x, "y": y, "w": w, "h": h, "rot": rot, "lockAspect": field_of(d, "lock") == "1"}))
+}
+
+fn text_row(ui: &mut Ui, d: &mut Dialog, label: &str, key: &str) {
+    let mut v = field_of(d, key);
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(148.0, 20.0), egui::Label::new(label));
+        ui.add(egui::TextEdit::singleline(&mut v).desired_width(96.0));
+    });
+    d.fields.insert(key.into(), v);
+}
+
+fn size_position_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    seed_size_position(app, d);
+    ui.label(egui::RichText::new("Size").strong());
+    text_row(ui, d, "Height (in):", "h");
+    text_row(ui, d, "Width (in):", "w");
+    text_row(ui, d, "Rotation (°):", "rot");
+    text_row(ui, d, "Scale height (%):", "scaleH");
+    text_row(ui, d, "Scale width (%):", "scaleW");
+    check(ui, d, "Lock aspect ratio", "lock", false);
+    ui.add_space(8.0);
+    ui.label(egui::RichText::new("Position").strong());
+    ui.label("From the top-left corner of the slide");
+    text_row(ui, d, "Horizontal (in):", "x");
+    text_row(ui, d, "Vertical (in):", "y");
+    reconcile_size_fields(d);
+    let (ok, cancel) = buttons(ui, "OK");
+    if ok {
+        match size_position_value(d) {
+            Ok(p) => return app.run("shape.sizePosition", p).is_ok(),
+            Err(msg) => {
+                app.set_status(msg);
+                return false;
+            }
+        }
+    }
+    cancel
+}
+
 fn pretty_equation(s: &str) -> String {
     let sup = |c: char| match c {
         '0' => '⁰',
@@ -829,3 +1070,7 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+#[path = "size_position_tests.rs"]
+mod size_position_tests;
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..223aa076 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -231,6 +231,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Align Right", "format.alignRight"),
                 ("Justify", "format.justify"),
                 ("-", ""),
+                ("Size and Position…", "shape.sizePosition"),
                 ("Right-to-Left Text Direction", "format.rtl"),
             ],
         ),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..b7a09265 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2044,6 +2044,9 @@ fn size_group(app: &mut SlideApp, ui: &mut Ui) {
                 }
             });
         });
+        if ui.add_enabled(bx.is_some(), egui::Button::new("Size and Position…")).clicked() {
+            run(app, "shape.sizePosition", json!({}));
+        }
     });
 }
 
diff --git a/crates/ui-egui/src/size_position_tests.rs b/crates/ui-egui/src/size_position_tests.rs
new file mode 100644
index 00000000..26baf713
--- /dev/null
+++ b/crates/ui-egui/src/size_position_tests.rs
@@ -0,0 +1,73 @@
+//! Size and Position dialog: the Shape Format launcher opens it, and OK applies one undo step.
+
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 900.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SlideApp::new(deckcraft_engine::Session::with_new(), Services::default()),
+    );
+    h.run_steps(2);
+    h
+}
+
+fn box_of(app: &SlideApp, id: u64) -> (f64, f64, f64, f64, f64) {
+    let st = app.session.active().unwrap();
+    let x = st.shape(deckcraft_model::ShapeId(id as u32)).and_then(|s| s.xfrm).unwrap();
+    (x.x, x.y, x.w, x.h, x.rot)
+}
+
+#[test]
+fn size_button_sets_width_in_one_undo() {
+    let mut h = harness();
+    let id = h.state_mut().session.execute("shape.insert", &json!({"preset": "rect", "rect": [40.0, 50.0, 200.0, 100.0]})).unwrap()["id"]
+        .as_u64()
+        .unwrap();
+    h.state_mut().ui.tab = "Shape Format".into();
+    h.run_steps(2);
+    h.get_by_label("Size and Position…").click();
+    h.run_steps(2);
+    let dlg = h.state().dialog.as_ref().unwrap();
+    assert_eq!(dlg.id, "sizePosition");
+    assert_eq!(dlg.fields.get("w").map(String::as_str), Some("2.78"));
+    assert_eq!(dlg.fields.get("h").map(String::as_str), Some("1.39"));
+    assert_eq!(dlg.fields.get("lock").map(String::as_str), Some("0"));
+    h.state_mut().dialog.as_mut().unwrap().fields.insert("w".into(), "4".into());
+    h.run_steps(1);
+    h.get_by_label("OK").click_accesskit();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none());
+    assert_eq!(box_of(h.state(), id), (40.0, 50.0, 288.0, 100.0, 0.0));
+    let undo = &h.state().session.active().unwrap().history.undo;
+    assert_eq!(undo.last().unwrap().label, "Size and Position…");
+    let n = undo.len();
+    h.state_mut().session.execute("edit.undo", &json!({})).unwrap();
+    assert_eq!(box_of(h.state(), id), (40.0, 50.0, 200.0, 100.0, 0.0));
+    assert_eq!(h.state().session.active().unwrap().history.undo.len(), n - 1);
+}
+
+#[test]
+fn lock_aspect_from_the_dialog_scales_height() {
+    let mut h = harness();
+    let id = h.state_mut().session.execute("shape.insert", &json!({"preset": "rect", "rect": [40.0, 50.0, 200.0, 100.0]})).unwrap()["id"]
+        .as_u64()
+        .unwrap();
+    h.state_mut().run("shape.sizePosition", json!({})).unwrap();
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().unwrap().id, "sizePosition");
+    {
+        let fields = &mut h.state_mut().dialog.as_mut().unwrap().fields;
+        fields.insert("lock".into(), "1".into());
+        fields.insert("w".into(), "4".into());
+    }
+    h.get_by_label("OK").click_accesskit();
+    h.run_steps(2);
+    assert_eq!(box_of(h.state(), id), (40.0, 50.0, 288.0, 144.0, 0.0));
+}
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..e95d9698 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Size and Position dialog, 227 commands, 28 dialogs; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -20,8 +20,8 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Size and Position dialog (`shape.sizePosition`): position, size, rotation, scale and lock aspect in one undo step. 227 commands, 28 dialogs |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..f4471aaa 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Size and Position dialog; previous: minor, 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,8 +203,8 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
+  Replace Fonts, Action Settings, Print, Insert Object…). Size and Position is one of the 28. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Size and Position dialog landed (position, size, rotation, scale, lock aspect, one undo). The dialog gap remains Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object and the rest of the ~60 |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..2f501c25 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (227 commands; breadth stays 79%, ready stays ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -239,7 +239,7 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 226 commands, every one reachable from `deckcraft-cli`, the JSON control channel
+- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
   and MCP.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Size and Position dialog. Command count 226 → 227. Breadth stays 79%, ready stays ~55%, UI stays ~60% |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..6b652890 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Size and Position dialog; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Size and Position, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -81,7 +81,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Edit points on freeforms | yes | **no** |
 | Crop handles, crop to shape, aspect ratio | yes | partial |
 | Text caret, selection, double/triple click, drag-select | yes | yes; Tab in text boxes ends editing (#78) |
-| Exact size/position, lock aspect | yes | yes |
+| Exact size/position, lock aspect | yes | yes — Size and Position dialog (height, width, rotation, scale %, lock aspect, position from the top-left), one undo step; ribbon spinners still resize one side at a time |
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
 | Drag and drop of files and between thumbnails | yes | yes |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Size and Position dialog on Shape Format › Size and the shape context menu. Breadth stays 79%; UI ready stays ~60% |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 111f02911287b00cc2a3b0c2750f61203d51e18f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:23:17 +0300
Subject: [PATCH 249/376] Shapes: star4 and star5 text rectangles as ECMA-376
 defines them

---
 crates/geom/src/preset.rs | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/crates/geom/src/preset.rs b/crates/geom/src/preset.rs
index 6a295359..54143422 100644
--- a/crates/geom/src/preset.rs
+++ b/crates/geom/src/preset.rs
@@ -541,6 +541,27 @@ fn star(n: usize, w: f64, h: f64, inner: f64) -> Vec<(f64, f64)> {
     pts
 }
 
+/// The text rectangle ECMA-376's presetShapeDefinitions give a star (`inner` is the adjust value
+/// over 50000), where known: star4's is the square inside its inner points, star5's spans the
+/// inner pentagon from its upper side points to its bottom inner point.
+fn star_text_rect(n: usize, w: f64, h: f64, inner: f64) -> Option<Rect> {
+    let (hc, vc) = (w / 2.0, h / 2.0);
+    match n {
+        4 => {
+            let (dx, dy) = (hc * inner * 45f64.to_radians().cos(), vc * inner * 45f64.to_radians().sin());
+            Some(Rect::new(hc - dx, vc - dy, hc + dx, vc + dy))
+        }
+        5 => {
+            let (swd2, shd2, svc) = (hc * 1.05146, vc * 1.10557, vc * 1.10557);
+            let (iwd2, ihd2) = (swd2 * inner, shd2 * inner);
+            let sdx1 = iwd2 * 18f64.to_radians().cos();
+            let sdy1 = ihd2 * 54f64.to_radians().sin();
+            Some(Rect::new(hc - sdx1, svc - sdy1, hc + sdx1, svc + ihd2))
+        }
+        _ => None,
+    }
+}
+
 #[derive(Clone, Copy)]
 enum Corner {
     Square,
@@ -1615,7 +1636,8 @@ pub fn build(name: &str, w: f64, h: f64, adj: &[f64]) -> Option<Geometry> {
             let n: usize = name.trim_start_matches("star").parse().unwrap_or(5);
             let v = a(0).clamp(0.0, 50000.0);
             let inner = v / 50000.0;
-            let mut g = simple(b.poly(&star(n, w, h, inner)).take(), full.inset(-ss * (0.5 - inner * 0.5) * 0.5), w, h);
+            let text = star_text_rect(n, w, h, inner).unwrap_or_else(|| full.inset(-ss * (0.5 - inner * 0.5) * 0.5));
+            let mut g = simple(b.poly(&star(n, w, h, inner)).take(), text, w, h);
             g.handles.push(Handle::new(0, Point::new(w / 2.0, h / 2.0), Vec2::new(0.0, -h / 2.0 / 50000.0), v, 0.0, 50000.0));
             g
         }
@@ -2306,6 +2328,19 @@ mod tests {
         }
     }
 
+    #[test]
+    fn star_text_rectangles_follow_the_standard() {
+        // star5 at its default 19098 in a 144 pt square: the inner pentagon, about 0.38 of the
+        // width (PowerPoint wraps "Shape 3" at 18 pt there), from y ≈ 55 to ≈ 110.
+        let g = build("star5", 144.0, 144.0, &[]).unwrap();
+        let t = g.text_rect;
+        assert!((t.width() - 55.0).abs() < 1.0, "{t:?}");
+        assert!((t.y0 - 55.0).abs() < 1.0 && (t.y1 - 110.0).abs() < 1.0, "{t:?}");
+        // star4 at 12500: the square through its inner points' 45° corners.
+        let g = build("star4", 144.0, 144.0, &[]).unwrap();
+        assert!((g.text_rect.width() - 72.0 * 0.25 * 2f64.sqrt()).abs() < 0.5, "{:?}", g.text_rect);
+    }
+
     #[test]
     fn stars_are_stretched_like_the_standards() {
         // star5 in a 216 pt square: top point at the top middle, side points at 18 degrees on an

From c583480010e2e565b0b174c28252bdeae1b53226 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:27:57 +0300
Subject: [PATCH 250/376] Startup: survive damaged settings, font folders,
 recovery folders and small texture limits

- ui.json / prefs.json are read through a new settings module: regular files only, 4 MiB
  cap, parse errors logged, values sanitized (a saved zoom of 1e30 aborted start-up,
  1e4 panicked in egui); writes are atomic.
- The canvas and the control protocol clamp stray zooms; the status bar shows the zoom in use.
- The canvas texture is cut to the GPU's max texture side (zoom 400% on a 2048 limit panicked).
- The system font scan opens only regular files of sane size (a FIFO named *.ttf in ~/.fonts
  hung start-up), with depth and entry caps.
- AutoRecover skips non-regular entries and reopens at most 32 per start, newest first.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 apps/deckcraft/src/main.rs     |  26 ++---
 crates/engine/src/lib.rs       |  23 +++++
 crates/engine/src/recovery.rs  |  63 ++++++++++--
 crates/fonts/src/fontdb.rs     |  45 ++++++++-
 crates/fonts/src/lib.rs        |  26 +++++
 crates/ui-egui/src/canvas.rs   |   3 +-
 crates/ui-egui/src/control.rs  |   6 +-
 crates/ui-egui/src/lib.rs      |  38 +++++++-
 crates/ui-egui/src/settings.rs | 170 +++++++++++++++++++++++++++++++++
 crates/ui-egui/src/status.rs   |   2 +-
 crates/ui-egui/src/textures.rs |  37 ++++++-
 11 files changed, 402 insertions(+), 37 deletions(-)
 create mode 100644 crates/ui-egui/src/settings.rs

diff --git a/apps/deckcraft/src/main.rs b/apps/deckcraft/src/main.rs
index 7b5e48bb..49b55cec 100644
--- a/apps/deckcraft/src/main.rs
+++ b/apps/deckcraft/src/main.rs
@@ -52,24 +52,16 @@ fn config_dir() -> Option<std::path::PathBuf> {
     }
 }
 
-fn prefs_path() -> Option<std::path::PathBuf> {
-    config_dir().map(|b| b.join("ui.json"))
-}
-
 fn load_prefs(app: &mut SlideApp) {
     if std::env::var_os("DECKCRAFT_NO_PREFS").is_some() {
         return;
     }
-    if let Some(p) = prefs_path()
-        && let Ok(bytes) = std::fs::read(&p)
-        && let Ok(ui) = serde_json::from_slice::<deckcraft_ui_egui::UiState>(&bytes)
-    {
+    let Some(dir) = config_dir() else { return };
+    let (ui, prefs) = deckcraft_ui_egui::settings::load(&dir);
+    if let Some(ui) = ui {
         app.ui = ui;
     }
-    if let Some(p) = prefs_path().map(|p| p.with_file_name("prefs.json"))
-        && let Ok(bytes) = std::fs::read(&p)
-        && let Ok(prefs) = serde_json::from_slice::<deckcraft_engine::Prefs>(&bytes)
-    {
+    if let Some(prefs) = prefs {
         app.session.prefs = prefs;
     }
 }
@@ -78,14 +70,8 @@ fn save_prefs(app: &SlideApp) {
     if std::env::var_os("DECKCRAFT_NO_PREFS").is_some() {
         return;
     }
-    if let Some(p) = prefs_path() {
-        let _ = std::fs::create_dir_all(p.parent().unwrap_or(std::path::Path::new(".")));
-        if let Ok(bytes) = serde_json::to_vec_pretty(&app.ui) {
-            let _ = std::fs::write(&p, bytes);
-        }
-        if let Ok(bytes) = serde_json::to_vec_pretty(&app.session.prefs) {
-            let _ = std::fs::write(p.with_file_name("prefs.json"), bytes);
-        }
+    if let Some(dir) = config_dir() {
+        deckcraft_ui_egui::settings::save(&dir, &app.ui, &app.session.prefs);
     }
 }
 
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..7d23a42c 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -269,6 +269,29 @@ impl Default for Prefs {
     }
 }
 
+impl Prefs {
+    /// The preferences with every value in a range the editor can use: `prefs.json` is a file
+    /// on disk, and a hand-edited or damaged one (a zero grid, a huge paste offset or undo
+    /// limit) must not break editing or exhaust memory. Out-of-range numbers take their
+    /// defaults or the nearest usable value.
+    pub fn sanitized(mut self) -> Prefs {
+        let d = Prefs::default();
+        let within = |v: f64, lo: f64, hi: f64, default: f64| if v.is_finite() { v.clamp(lo, hi) } else { default };
+        self.grid_spacing =
+            if self.grid_spacing.is_finite() && self.grid_spacing > 0.0 { self.grid_spacing.clamp(0.5, 1000.0) } else { d.grid_spacing };
+        self.duplicate_offset = within(self.duplicate_offset, -1000.0, 1000.0, d.duplicate_offset);
+        self.undo_limit = self.undo_limit.min(MAX_UNDO_LIMIT);
+        self.recovery_minutes = within(self.recovery_minutes, 0.1, 24.0 * 60.0, d.recovery_minutes);
+        if self.author.chars().count() > 256 {
+            self.author = self.author.chars().take(256).collect();
+        }
+        self
+    }
+}
+
+/// The most undo steps [`Prefs::undo_limit`] can keep.
+pub const MAX_UNDO_LIMIT: usize = 10_000;
+
 /// Things a command or tool asks the UI to do (open a dialog, show a pane, start the show…).
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase", tag = "kind")]
diff --git a/crates/engine/src/recovery.rs b/crates/engine/src/recovery.rs
index 30daa81e..391a0374 100644
--- a/crates/engine/src/recovery.rs
+++ b/crates/engine/src/recovery.rs
@@ -25,6 +25,20 @@ pub fn default_dir() -> Option<PathBuf> {
     std::env::var_os("XDG_DATA_HOME").map(PathBuf::from).or_else(|| home.map(|h| h.join(".local/share"))).map(|d| d.join("deckcraft/recovery"))
 }
 
+/// Presentations reopened per start; the rest stay on disk for the next one, so a folder
+/// full of entries can't stall start-up.
+pub const MAX_REOPEN: usize = 32;
+/// Largest entry read back.
+const MAX_ENTRY_BYTES: u64 = 2 << 30;
+const MAX_META_BYTES: u64 = 64 << 10;
+
+/// `p` as bytes when it's a regular file no bigger than `max`: reading a FIFO left where an
+/// entry belongs would block start-up forever.
+fn read_regular(p: &Path, max: u64) -> Option<Vec<u8>> {
+    let m = std::fs::metadata(p).ok()?;
+    (m.is_file() && m.len() <= max).then(|| std::fs::read(p).ok()).flatten()
+}
+
 fn files(dir: &Path, uid: u64) -> (PathBuf, PathBuf) {
     (dir.join(format!("{uid}.deckcraft")), dir.join(format!("{uid}.json")))
 }
@@ -78,11 +92,13 @@ pub fn list(dir: &Path) -> Vec<(u64, Value)> {
         if p.extension().and_then(|x| x.to_str()) != Some("deckcraft") {
             continue;
         }
+        if !std::fs::metadata(&p).is_ok_and(|m| m.is_file()) {
+            continue;
+        }
         let Some(uid) = p.file_stem().and_then(|s| s.to_str()).and_then(|s| s.parse::<u64>().ok()) else { continue };
         // Metadata is a file on disk: anything but an object (corrupt, hand-edited) counts as none.
-        let meta = std::fs::read_to_string(p.with_extension("json"))
-            .ok()
-            .and_then(|t| serde_json::from_str::<Value>(&t).ok())
+        let meta = read_regular(&p.with_extension("json"), MAX_META_BYTES)
+            .and_then(|t| serde_json::from_slice::<Value>(&t).ok())
             .filter(Value::is_object)
             .unwrap_or(json!({}));
         out.push((uid, meta));
@@ -92,12 +108,17 @@ pub fn list(dir: &Path) -> Vec<(u64, Value)> {
 }
 
 /// Reopen every entry as an unsaved presentation and remove the entries (this session writes its
-/// own). Unreadable entries are left in place. Returns the opened documents' indices.
+/// own), the newest [`MAX_REOPEN`] first. Unreadable entries and those past the cap are left in place. Returns the opened documents' indices.
 pub fn open(s: &mut Session, dir: &Path) -> Result<Vec<usize>> {
     let mut opened = Vec::new();
-    for (uid, meta) in list(dir) {
+    let mut entries = list(dir);
+    entries.sort_by_key(|(uid, meta)| std::cmp::Reverse((meta.get("saved").and_then(Value::as_u64).unwrap_or(0), *uid)));
+    for (uid, meta) in entries {
+        if opened.len() >= MAX_REOPEN {
+            break;
+        }
         let (doc, _) = files(dir, uid);
-        let Ok(bytes) = std::fs::read(&doc) else { continue };
+        let Some(bytes) = read_regular(&doc, MAX_ENTRY_BYTES) else { continue };
         let Ok(mut d) = deckcraft_format::load(&bytes) else { continue };
         deckcraft_format::repair(&mut d);
         let path = meta.get("path").and_then(Value::as_str).map(str::to_string);
@@ -162,4 +183,34 @@ mod tests {
         assert_eq!(v.as_array().map(Vec::len), Some(1));
         let _ = std::fs::remove_dir_all(&dir);
     }
+
+    /// A FIFO where an entry or its metadata belongs is skipped rather than read (that blocked
+    /// start-up forever), and a folder full of entries reopens only [`MAX_REOPEN`] per start.
+    #[cfg(unix)]
+    #[test]
+    fn hostile_recovery_folders_dont_stall_start_up() {
+        let dir = temp("recovery-hostile");
+        let mut s = Session::new();
+        s.execute("file.new", &json!({})).unwrap();
+        s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+        save(&s, &dir).unwrap();
+        let (good, _) = files(&dir, s.doc().unwrap().uid);
+        for i in 1..=(MAX_REOPEN as u64 + 3) {
+            std::fs::copy(&good, dir.join(format!("{}.deckcraft", 100_000 + i))).unwrap();
+        }
+        for name in ["5.deckcraft", "6.json"] {
+            let _ = std::process::Command::new("mkfifo").arg(dir.join(name)).status();
+        }
+        std::fs::write(dir.join("6.deckcraft"), std::fs::read(&good).unwrap()).unwrap();
+        let (tx, rx) = std::sync::mpsc::channel();
+        let d = dir.clone();
+        std::thread::spawn(move || {
+            let mut s2 = Session::new();
+            let _ = tx.send(open(&mut s2, &d).map(|v| v.len()).unwrap_or(0));
+        });
+        let n = rx.recv_timeout(std::time::Duration::from_secs(60)).expect("recovery hung");
+        assert_eq!(n, MAX_REOPEN);
+        assert_eq!(list(&dir).len(), 5, "the rest wait for the next start");
+        let _ = std::fs::remove_dir_all(&dir);
+    }
 }
diff --git a/crates/fonts/src/fontdb.rs b/crates/fonts/src/fontdb.rs
index 5425c022..059db7f1 100644
--- a/crates/fonts/src/fontdb.rs
+++ b/crates/fonts/src/fontdb.rs
@@ -444,6 +444,22 @@ fn file_face_names(path: &std::path::Path) -> Vec<(String, String)> {
         .collect()
 }
 
+/// Folder depth below a font folder that the system scan descends.
+#[cfg(not(target_arch = "wasm32"))]
+const MAX_SCAN_DEPTH: usize = 12;
+/// Directory entries the system scan looks at in all.
+#[cfg(not(target_arch = "wasm32"))]
+const MAX_SCAN_ENTRIES: usize = 200_000;
+/// The largest font file read (the biggest CJK collections are a few hundred MB).
+#[cfg(not(target_arch = "wasm32"))]
+pub const MAX_FONT_FILE: u64 = 512 << 20;
+
+/// A regular file of a size a font can have.
+#[cfg(not(target_arch = "wasm32"))]
+fn font_file_ok(meta: &std::fs::Metadata) -> bool {
+    meta.is_file() && meta.len() > 12 && meta.len() <= MAX_FONT_FILE
+}
+
 /// The platform's font folders (the system's and the user's), scanned by [`FontDb::global`].
 /// Empty on wasm.
 pub fn system_font_dirs() -> Vec<std::path::PathBuf> {
@@ -804,24 +820,41 @@ impl FontDb {
     #[cfg(not(target_arch = "wasm32"))]
     fn scan_font_dirs(&self) -> usize {
         let mut found = Vec::new();
-        let mut stack = self.font_dirs.clone();
+        let mut stack: Vec<(std::path::PathBuf, usize)> = self.font_dirs.iter().map(|d| (d.clone(), 0)).collect();
         // Each folder once, however links lead back to it.
         let mut visited = std::collections::HashSet::new();
-        while let Some(d) = stack.pop() {
+        let mut entries = 0usize;
+        while let Some((d, depth)) = stack.pop() {
             if !visited.insert(std::fs::canonicalize(&d).unwrap_or_else(|_| d.clone())) {
                 continue;
             }
             let Ok(rd) = std::fs::read_dir(&d) else { continue };
             for e in rd.flatten() {
+                // A link to `/` or a vast tree mustn't turn start-up into a disk crawl.
+                entries += 1;
+                if entries > MAX_SCAN_ENTRIES {
+                    log::warn!("font scan stopped after {MAX_SCAN_ENTRIES} entries");
+                    stack.clear();
+                    break;
+                }
                 let p = e.path();
-                if p.is_dir() {
-                    stack.push(p);
+                // Follows links: what matters is what the entry leads to.
+                let Ok(meta) = std::fs::metadata(&p) else { continue };
+                if meta.is_dir() {
+                    if depth < MAX_SCAN_DEPTH {
+                        stack.push((p, depth + 1));
+                    }
                     continue;
                 }
                 let ext = p.extension().and_then(|e| e.to_str()).map(|e| e.to_ascii_lowercase());
                 if !matches!(ext.as_deref(), Some("ttf" | "otf" | "ttc" | "otc")) {
                     continue;
                 }
+                // Only regular files: opening a FIFO named like a font blocks until something
+                // writes to it (start-up hung), and a device never ends.
+                if !font_file_ok(&meta) {
+                    continue;
+                }
                 for (family, style) in file_face_names(&p) {
                     found.push(CatalogEntry { family, style, path: p.clone() });
                 }
@@ -845,7 +878,9 @@ impl FontDb {
         };
         let mut any = false;
         for p in paths {
-            if let Ok(data) = std::fs::read(&p) {
+            if std::fs::metadata(&p).is_ok_and(|m| font_file_ok(&m))
+                && let Ok(data) = std::fs::read(&p)
+            {
                 any |= self.add_font(data) > 0;
             }
         }
diff --git a/crates/fonts/src/lib.rs b/crates/fonts/src/lib.rs
index 978661bb..4c6759e4 100644
--- a/crates/fonts/src/lib.rs
+++ b/crates/fonts/src/lib.rs
@@ -299,4 +299,30 @@ mod tests {
             assert_eq!(db.face("Calibri", "Bold").family, "Carlito");
         }
     }
+
+    /// A FIFO, a folder and a link loop dressed up as font files: the system scan skips them
+    /// instead of blocking forever on the FIFO (start-up hung when one sat in `~/.fonts`), and
+    /// still finds the real font beside them.
+    #[cfg(unix)]
+    #[test]
+    fn the_font_scan_skips_fifos_folders_and_link_loops() {
+        let dir = std::env::temp_dir().join(format!("deckcraft-fontscan-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        std::fs::create_dir_all(dir.join("sub")).unwrap();
+        std::fs::copy(std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/legacy-semibold.ttf"), dir.join("sub/real.ttf")).unwrap();
+        let fifo = std::process::Command::new("mkfifo").arg(dir.join("trap.ttf")).status().is_ok_and(|s| s.success());
+        std::fs::create_dir(dir.join("folder.ttf")).unwrap();
+        std::fs::write(dir.join("empty.otf"), b"").unwrap();
+        std::os::unix::fs::symlink(&dir, dir.join("sub/loop")).unwrap();
+        let (tx, rx) = std::sync::mpsc::channel();
+        let scan_dir = dir.clone();
+        std::thread::spawn(move || {
+            let db = FontDb::with_font_dirs(vec![scan_dir]);
+            let _ = tx.send(db.load_system_fonts());
+        });
+        let n = rx.recv_timeout(std::time::Duration::from_secs(30)).expect("the font scan hung");
+        assert!(n >= 1, "the real font was found");
+        assert!(fifo || n >= 1);
+        let _ = std::fs::remove_dir_all(&dir);
+    }
 }
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..c7290b35 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -41,7 +41,8 @@ pub fn layout(app: &SlideApp, avail: Rect) -> (Rect, f32) {
     let (sw, sh) = (d.doc.slide_size.width as f32, d.doc.slide_size.height as f32);
     let margin = 28.0;
     let fit = ((avail.width() - margin * 2.0) / sw).min((avail.height() - margin * 2.0) / sh).max(0.05);
-    let scale = app.ui.zoom.unwrap_or(fit);
+    // A zoom from outside the editor's own controls (settings, the control protocol) is kept in range.
+    let scale = app.ui.zoom.filter(|z| z.is_finite() && *z > 0.0).map_or(fit, |z| z.clamp(*crate::ZOOM_RANGE.start(), *crate::ZOOM_RANGE.end()));
     let size = vec2(sw * scale, sh * scale);
     let mut r = Rect::from_center_size(avail.center(), size);
     if size.x > avail.width() {
diff --git a/crates/ui-egui/src/control.rs b/crates/ui-egui/src/control.rs
index d344d912..704de448 100644
--- a/crates/ui-egui/src/control.rs
+++ b/crates/ui-egui/src/control.rs
@@ -229,7 +229,11 @@ pub fn handle(app: &mut SlideApp, ctx: &egui::Context, req: &ControlRequest) ->
                 };
             }
             if let Some(z) = p.get("zoom") {
-                app.ui.zoom = z.as_f64().map(|v| v as f32);
+                app.ui.zoom = z
+                    .as_f64()
+                    .map(|v| v as f32)
+                    .filter(|v| v.is_finite() && *v > 0.0)
+                    .map(|v| v.clamp(*crate::ZOOM_RANGE.start(), *crate::ZOOM_RANGE.end()));
             }
             if let Some(d) = p.get("dark").and_then(Value::as_bool) {
                 let _ = app.run("view.dark", json!({"on": d}));
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..b40daf7b 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -18,6 +18,7 @@ pub mod menus;
 pub mod panes;
 pub mod ribbon;
 pub mod selpane;
+pub mod settings;
 pub mod show;
 pub mod sorter;
 pub mod status;
@@ -131,6 +132,41 @@ impl Default for UiState {
     }
 }
 
+/// The editor's zoom range (1 = 100 %).
+pub const ZOOM_RANGE: std::ops::RangeInclusive<f32> = 0.1..=4.0;
+
+impl UiState {
+    /// The state with every value usable: `ui.json` is a file on disk, and a damaged or
+    /// hand-edited one must not stop the window from opening. A zoom of 10,000 % asked the
+    /// renderer for a texture larger than memory at start-up; panel sizes, scales and names are
+    /// brought into range the same way, and the recent list is cut to its usual length.
+    pub fn sanitized(mut self) -> UiState {
+        let d = UiState::default();
+        let within = |v: f32, lo: f32, hi: f32, default: f32| if v.is_finite() { v.clamp(lo, hi) } else { default };
+        self.zoom = self.zoom.filter(|z| z.is_finite() && *z > 0.0).map(|z| z.clamp(*ZOOM_RANGE.start(), *ZOOM_RANGE.end()));
+        self.sorter_zoom = within(self.sorter_zoom, 0.5, 3.0, d.sorter_zoom);
+        self.ui_scale = within(self.ui_scale, 0.5, 3.0, d.ui_scale);
+        self.notes_height = within(self.notes_height, 0.0, 2000.0, d.notes_height);
+        self.thumbs_width = within(self.thumbs_width, 60.0, 1000.0, d.thumbs_width);
+        self.pane_width = within(self.pane_width, 240.0, 520.0, d.pane_width);
+        let short = |s: &String| s.len() <= 64;
+        if !short(&self.tab) {
+            self.tab = d.tab;
+        }
+        if !short(&self.format_tab) {
+            self.format_tab = d.format_tab;
+        }
+        self.pane = self.pane.filter(short);
+        self.recent.retain(|p| !p.is_empty() && p.len() <= 4096 && !p.contains('\0'));
+        self.recent.dedup();
+        self.recent.truncate(RECENT_MAX);
+        self
+    }
+}
+
+/// How many recent files File › Open and Home list.
+pub const RECENT_MAX: usize = 12;
+
 /// UI-only commands (id, label, shortcut, params).
 pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("view.normal", "Normal", None, "{}"),
@@ -575,7 +611,7 @@ impl SlideApp {
         self.session.execute("file.open", &json!({"path": path})).map_err(|e| e.to_string())?;
         self.ui.recent.retain(|p| p != path);
         self.ui.recent.insert(0, path.to_string());
-        self.ui.recent.truncate(12);
+        self.ui.recent.truncate(RECENT_MAX);
         self.ui.view = ViewMode::Normal;
         Ok(())
     }
diff --git a/crates/ui-egui/src/settings.rs b/crates/ui-egui/src/settings.rs
new file mode 100644
index 00000000..9a1b8b62
--- /dev/null
+++ b/crates/ui-egui/src/settings.rs
@@ -0,0 +1,170 @@
+//! The desktop app's settings files, `ui.json` ([`UiState`]) and `prefs.json`
+//! ([`deckcraft_engine::Prefs`]), in the per-user settings folder. They are files on disk that a
+//! crash, a full disk or a hand edit can leave damaged, so reading never fails and never trusts
+//! them: an unreadable, oversized or malformed file gives the defaults, and the values of a
+//! well-formed one are brought into range ([`UiState::sanitized`], `Prefs::sanitized`). Writing
+//! goes through a temporary file and a rename, so a crash mid-write leaves the old file.
+
+use std::path::Path;
+
+use deckcraft_engine::Prefs;
+
+use crate::UiState;
+
+pub const UI_FILE: &str = "ui.json";
+pub const PREFS_FILE: &str = "prefs.json";
+/// Larger settings files are not settings.
+pub const MAX_BYTES: u64 = 4 << 20;
+
+/// The JSON in `path`, when it is a regular file of a sane size that holds a `T`.
+fn read<T: serde::de::DeserializeOwned>(path: &Path) -> Option<T> {
+    let meta = std::fs::metadata(path).ok()?;
+    if !meta.is_file() || meta.len() > MAX_BYTES {
+        log::warn!("{}: not a settings file; using the defaults", path.display());
+        return None;
+    }
+    let bytes = std::fs::read(path).ok()?;
+    match serde_json::from_slice(&bytes) {
+        Ok(v) => Some(v),
+        Err(e) => {
+            log::warn!("{}: {e}; using the defaults", path.display());
+            None
+        }
+    }
+}
+
+/// The saved UI state and preferences in `dir` (each `None` when missing or unusable).
+pub fn load(dir: &Path) -> (Option<UiState>, Option<Prefs>) {
+    (read::<UiState>(&dir.join(UI_FILE)).map(UiState::sanitized), read::<Prefs>(&dir.join(PREFS_FILE)).map(Prefs::sanitized))
+}
+
+/// Write `bytes` to `path` through a temporary file beside it.
+fn write_atomic(path: &Path, bytes: &[u8]) -> std::io::Result<()> {
+    let tmp = path.with_extension("json.tmp");
+    std::fs::write(&tmp, bytes)?;
+    std::fs::rename(&tmp, path).inspect_err(|_| {
+        let _ = std::fs::remove_file(&tmp);
+    })
+}
+
+/// Save both files into `dir` (created when missing). Failures are logged, not fatal.
+pub fn save(dir: &Path, ui: &UiState, prefs: &Prefs) {
+    if let Err(e) = std::fs::create_dir_all(dir) {
+        log::warn!("{}: {e}; settings not saved", dir.display());
+        return;
+    }
+    for (name, json) in [(UI_FILE, serde_json::to_vec_pretty(ui)), (PREFS_FILE, serde_json::to_vec_pretty(prefs))] {
+        let path = dir.join(name);
+        if let Err(e) = json.map_err(std::io::Error::other).and_then(|b| write_atomic(&path, &b)) {
+            log::warn!("{}: {e}", path.display());
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used)]
+    use super::*;
+
+    fn dir(name: &str) -> std::path::PathBuf {
+        let d = std::env::temp_dir().join(format!("deckcraft-settings-{}-{name}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&d);
+        std::fs::create_dir_all(&d).unwrap();
+        d
+    }
+
+    #[test]
+    fn damaged_settings_files_give_the_defaults() {
+        let d = dir("damaged");
+        let cases: [&[u8]; 6] = [b"", b"{", b"\xFF\xFE garbage", b"[1, 2, 3]", b"{\"zoom\": \"big\"}", b"null"];
+        for bytes in cases {
+            std::fs::write(d.join(UI_FILE), bytes).unwrap();
+            std::fs::write(d.join(PREFS_FILE), bytes).unwrap();
+            let (ui, prefs) = load(&d);
+            // Prefs has no `zoom`, so that case is a valid (default) Prefs.
+            assert!(ui.is_none(), "{:?}", String::from_utf8_lossy(bytes));
+            assert!(prefs.is_none() || bytes.starts_with(b"{\"zoom"), "{:?}", String::from_utf8_lossy(bytes));
+        }
+        // A folder where a file should be, and an oversized file.
+        std::fs::remove_file(d.join(UI_FILE)).unwrap();
+        std::fs::create_dir(d.join(UI_FILE)).unwrap();
+        std::fs::write(d.join(PREFS_FILE), vec![b' '; MAX_BYTES as usize + 1]).unwrap();
+        assert!(matches!(load(&d), (None, None)));
+        // Nothing there at all.
+        assert!(matches!(load(&d.join("missing")), (None, None)));
+    }
+
+    #[test]
+    fn out_of_range_values_are_brought_into_range() {
+        let d = dir("ranges");
+        let recent: Vec<String> = (0..5000).map(|i| format!("/tmp/deck{i}.pptx")).collect();
+        let ui = serde_json::json!({
+            "zoom": 1.0e30, "sorterZoom": -4.0, "uiScale": 1.0e9, "notesHeight": 1.0e30,
+            "thumbsWidth": -1.0e30, "paneWidth": 3.4e38, "tab": "x".repeat(10_000), "pane": "y".repeat(500),
+            "recent": recent,
+        });
+        let prefs = serde_json::json!({"gridSpacing": 0.0, "duplicateOffset": 1.0e300, "undoLimit": u64::MAX, "recoveryMinutes": -5.0, "author": "a".repeat(100_000)});
+        std::fs::write(d.join(UI_FILE), ui.to_string()).unwrap();
+        std::fs::write(d.join(PREFS_FILE), prefs.to_string()).unwrap();
+        let (ui, prefs) = load(&d);
+        let (ui, prefs) = (ui.unwrap(), prefs.unwrap());
+        assert_eq!(ui.zoom, Some(*crate::ZOOM_RANGE.end()));
+        assert_eq!((ui.sorter_zoom, ui.ui_scale), (0.5, 3.0));
+        assert!(ui.notes_height <= 2000.0 && ui.thumbs_width >= 60.0 && ui.pane_width <= 520.0);
+        assert_eq!((ui.tab.as_str(), ui.pane.as_deref()), ("Home", None));
+        assert_eq!(ui.recent.len(), crate::RECENT_MAX);
+        assert_eq!(prefs.grid_spacing, Prefs::default().grid_spacing);
+        assert_eq!(prefs.duplicate_offset, 1000.0);
+        assert_eq!(prefs.undo_limit, deckcraft_engine::MAX_UNDO_LIMIT);
+        assert_eq!(prefs.recovery_minutes, 0.1);
+        assert_eq!(prefs.author.chars().count(), 256);
+        // A zero or negative zoom means "fit".
+        std::fs::write(d.join(UI_FILE), r#"{"zoom": 0}"#).unwrap();
+        assert_eq!(load(&d).0.unwrap().zoom, None);
+    }
+
+    #[test]
+    fn saving_round_trips_and_leaves_no_temporary_file() {
+        let d = dir("save");
+        let ui = UiState { zoom: Some(1.5), recent: vec!["/a.pptx".into()], ..Default::default() };
+        let prefs = Prefs { author: "Ann".into(), ..Default::default() };
+        save(&d.join("nested"), &ui, &prefs);
+        let (u, p) = load(&d.join("nested"));
+        assert_eq!(u.unwrap().zoom, Some(1.5));
+        assert_eq!(p.unwrap().author, "Ann");
+        let names: Vec<String> =
+            std::fs::read_dir(d.join("nested")).unwrap().flatten().map(|e| e.file_name().to_string_lossy().to_string()).collect();
+        assert!(names.iter().all(|n| !n.ends_with(".tmp")), "{names:?}");
+        // A settings folder that is a file: nothing saved, no panic.
+        std::fs::write(d.join("blocked"), "file").unwrap();
+        save(&d.join("blocked"), &ui, &prefs);
+    }
+
+    /// The window opens with the worst `ui.json` values once they are sanitized; a zoom of
+    /// 10,000 % used to panic in egui and 1e30 exhausted memory at start-up.
+    #[test]
+    fn the_window_opens_with_hostile_saved_state() {
+        let hostile = UiState {
+            zoom: Some(1.0e30),
+            notes_height: 1.0e30,
+            thumbs_width: -1.0e30,
+            pane: Some("format".into()),
+            pane_width: 1.0e30,
+            ..Default::default()
+        };
+        for ui in [hostile.clone().sanitized(), UiState { zoom: Some(1.0e4), ..Default::default() }] {
+            let mut app = crate::SlideApp::new(deckcraft_engine::Session::with_new(), crate::Services::default());
+            // The second case is not sanitized: the canvas keeps a stray zoom in range itself.
+            app.ui = ui;
+            let mut h = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+                |ui, app: &mut crate::SlideApp| {
+                    app.logic(ui.ctx());
+                    app.ui(ui);
+                },
+                app,
+            );
+            h.run_steps(4);
+            assert!(h.state().canvas_scale <= *crate::ZOOM_RANGE.end() + 1e-3, "{}", h.state().canvas_scale);
+        }
+    }
+}
diff --git a/crates/ui-egui/src/status.rs b/crates/ui-egui/src/status.rs
index 8e915b71..11efe3f7 100644
--- a/crates/ui-egui/src/status.rs
+++ b/crates/ui-egui/src/status.rs
@@ -39,7 +39,7 @@ pub fn status_bar(app: &mut SlideApp, ui: &mut Ui) {
         if small_icon(&mut right, Icon::FitSmall, "Fit slide to current window", false).clicked() {
             app.ui.zoom = None;
         }
-        let pct = (app.ui.zoom.unwrap_or(app.canvas_scale) * 100.0).round();
+        let pct = (app.canvas_scale * 100.0).round();
         let lbl = right.add(egui::Label::new(egui::RichText::new(format!("{pct}%")).size(12.0).color(t.text_dim)).sense(Sense::click()));
         if lbl.clicked() {
             app.dialog = Some(crate::dialogs::Dialog::new("zoom"));
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index 40498422..b28f227f 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -116,7 +116,9 @@ impl Textures {
             Some((i, d)) if i == index => estimate.union(d),
             _ => estimate,
         };
-        let want = deckcraft_render::pasteboard_region(size, scale, reach, visible);
+        // The GPU's (or software fallback's) texture limit: a larger canvas texture panics in egui.
+        let max_side = ctx.input(|i| i.max_texture_side).max(1) as u32;
+        let want = fit_texture(deckcraft_render::pasteboard_region(size, scale, reach, visible), visible, max_side);
         let key = Key {
             slide: Arc::as_ptr(&slide) as usize,
             master: master.as_ref().map(|m| Arc::as_ptr(m) as usize).unwrap_or(0),
@@ -142,7 +144,8 @@ impl Textures {
         // Text spilling out of its box can reach further than the boxes said. Once drawn, the
         // region it calls for is known (and is next frame's key): render again only if it shows
         // more than this render covered.
-        let key = Key { want: deckcraft_render::pasteboard_region(size, scale, estimate.union(drawn), visible), ..key };
+        let key =
+            Key { want: fit_texture(deckcraft_render::pasteboard_region(size, scale, estimate.union(drawn), visible), visible, max_side), ..key };
         if !region.contains(&key.want) {
             region = key.want;
             img = render(region).0;
@@ -213,3 +216,33 @@ impl Textures {
         Some(tex)
     }
 }
+
+/// `r` cut to at most `max` pixels a side, keeping as much of `visible` as fits.
+pub(crate) fn fit_texture(mut r: Region, visible: Region, max: u32) -> Region {
+    fn axis(start: &mut i32, len: &mut u32, vis: i32, max: u32) {
+        if *len > max {
+            let hi = *start as i64 + (*len - max) as i64;
+            *start = (vis as i64).clamp(*start as i64, hi) as i32;
+            *len = max;
+        }
+    }
+    axis(&mut r.x, &mut r.w, visible.x, max);
+    axis(&mut r.y, &mut r.h, visible.y, max);
+    r
+}
+
+#[cfg(test)]
+mod fit_tests {
+    use super::*;
+
+    #[test]
+    fn canvas_textures_stay_within_the_texture_limit() {
+        let r = Region { x: -100, y: -50, w: 5000, h: 1000 };
+        let f = fit_texture(r, Region { x: 300, y: 0, w: 800, h: 600 }, 2048);
+        assert_eq!((f.x, f.y, f.w, f.h), (300, -50, 2048, 1000));
+        // Visible past the far end: the cut is pinned there.
+        let f = fit_texture(r, Region { x: 4800, y: 0, w: 800, h: 600 }, 2048);
+        assert_eq!((f.x, f.w), (-100 + 5000 - 2048, 2048));
+        assert_eq!(fit_texture(r, r, 8192), r);
+    }
+}

From 3fd108346861c38f5371d227cd952c37bcc45eab Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:27:58 +0300
Subject: [PATCH 251/376] Shapes: chevron text rectangle as
 presetShapeDefinitions give it

---
 crates/geom/src/preset.rs | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/crates/geom/src/preset.rs b/crates/geom/src/preset.rs
index 6a295359..9ef75382 100644
--- a/crates/geom/src/preset.rs
+++ b/crates/geom/src/preset.rs
@@ -1307,8 +1307,17 @@ pub fn build(name: &str, w: f64, h: f64, adj: &[f64]) -> Option<Geometry> {
             } else {
                 vec![(0.0, 0.0), (w - d, 0.0), (w, h / 2.0), (w - d, h), (0.0, h), (d, h / 2.0)]
             };
-            let tx = if name == "homePlate" { 0.0 } else { d };
-            let mut g = simple(b.poly(&pts).take(), Rect::new(tx, 0.0, w - d / 2.0, h), w, h);
+            // Text rectangles as presetShapeDefinitions give them: homePlate's runs to halfway
+            // along the point; chevron's lies between the notch and the point's base (x1..x2)
+            // and covers the whole width once those meet or cross (`?: dx x1 l`).
+            let text = if name == "homePlate" {
+                Rect::new(0.0, 0.0, w - d / 2.0, h)
+            } else if w - d > d {
+                Rect::new(d, 0.0, w - d, h)
+            } else {
+                Rect::new(0.0, 0.0, w, h)
+            };
+            let mut g = simple(b.poly(&pts).take(), text, w, h);
             g.handles.push(Handle::new(0, Point::new(w, 0.0), Vec2::new(-ss / 1e5, 0.0), v, 0.0, 100000.0 * w / ss.max(1e-9)));
             g
         }

From 4575d19ac76869200eb563cde2d38bfb4a703eb9 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:43:28 +0300
Subject: [PATCH 252/376] UI: Photo Album dialog inserts pictures as slides
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Insert › Images opens Photo Album. insert.photoAlbum adds the pictures
and text boxes as slides in the open presentation, one undo step, with
layouts, frames and captions. Omitting pictures opens the dialog.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                              |   4 +-
 crates/engine/src/cmd/insert.rs         | 497 ++++++++++++++++++++++++
 crates/ui-egui/src/dialogs.rs           | 189 +++++++++
 crates/ui-egui/src/menus.rs             |   1 +
 crates/ui-egui/src/photo_album_tests.rs |  90 +++++
 crates/ui-egui/src/ribbon.rs            |  11 +
 docs/architecture.md                    |   7 +-
 docs/gaps.md                            |   7 +-
 docs/target-app-parity.md               |   5 +-
 docs/ui-parity.md                       |   5 +-
 10 files changed, 805 insertions(+), 11 deletions(-)
 create mode 100644 crates/ui-egui/src/photo_album_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..6643c0dd 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog; breadth stays 79%, ready ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Photo Album dialog (`insert.photoAlbum`): pictures and text boxes become slides in the open presentation, one undo step. Breadth stays 79%, ready ~55% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Photo Album dialog. Breadth stays 79%, ready ~55% |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..2b5e605a 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -33,6 +33,15 @@ pub fn specs() -> Vec<CommandSpec> {
             has_slide,
             picture
         ),
+        cmd!(
+            "insert.photoAlbum",
+            "Photo Album…",
+            ["Insert", "Images"],
+            None,
+            "{pictures?: [{path?|data: base64, name?} | {text}], layout?: fit|1|2|4|1title|2title|4title, frame?: none|rect|rounded|simple, captions?: bool} — omit pictures to open the dialog",
+            has_doc,
+            photo_album
+        ),
         cmd!("insert.table", "Table…", ["Insert", "Tables"], None, "{rows, cols, rect?}", has_slide, table),
         cmd!(
             "insert.chart",
@@ -372,6 +381,336 @@ fn picture(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"id": id}))
 }
 
+const ALBUM_MAX_ITEMS: usize = 48;
+const ALBUM_MAX_BYTES: usize = 32 * 1024 * 1024;
+const ALBUM_MAX_TOTAL: usize = 64 * 1024 * 1024;
+const ALBUM_MAX_TEXT: usize = 400;
+
+#[derive(Clone, Copy)]
+struct AlbumLayout {
+    cols: usize,
+    rows: usize,
+    per: usize,
+    title: bool,
+    fit: bool,
+}
+
+#[derive(Clone, Copy)]
+enum AlbumFrame {
+    None,
+    Rect,
+    Rounded,
+    Simple,
+}
+
+struct AlbumPic {
+    name: String,
+    bytes: Vec<u8>,
+    px_w: f64,
+    px_h: f64,
+}
+
+enum AlbumItem {
+    Picture(AlbumPic),
+    Text(String),
+}
+
+enum AlbumSlide {
+    Pictures(Vec<AlbumPic>),
+    Text(String),
+}
+
+/// Insert a photo album after the current slide.
+///
+/// PowerPoint starts a new presentation. These slides go into the open one, so the album is one
+/// undo step. Omitting `pictures` asks the UI to open the dialog and does not edit.
+fn photo_album(s: &mut Session, p: &Value) -> Result<Value> {
+    match p.get("pictures") {
+        None | Some(Value::Null) => {
+            s.ui_requests.push(crate::UiRequest::Dialog { id: "photoAlbum".into(), params: json!({}) });
+            return Ok(json!({"dialog": "photoAlbum"}));
+        }
+        Some(_) => {}
+    }
+    let layout = album_layout(p)?;
+    let frame = album_frame(p)?;
+    let captions = album_captions(p)?;
+    let items = album_items(p)?;
+    let (snapshot, sel) = {
+        let st = s.doc()?;
+        (st.doc.clone(), st.selection.clone())
+    };
+    let result = insert_album(s, items, layout, frame, captions);
+    if result.is_err()
+        && let Some(st) = s.active_mut()
+    {
+        st.doc = snapshot;
+        st.selection = sel;
+    }
+    result
+}
+
+fn album_norm(s: &str) -> String {
+    s.chars().filter(|c| c.is_ascii_alphanumeric()).collect::<String>().to_ascii_lowercase()
+}
+
+fn album_layout(p: &Value) -> Result<AlbumLayout> {
+    let key = match p.get("layout") {
+        None => return Ok(AlbumLayout { cols: 1, rows: 1, per: 1, title: false, fit: false }),
+        Some(Value::String(s)) => s.as_str(),
+        Some(_) => return Err(bad("insert.photoAlbum", "`layout` must be text")),
+    };
+    match album_norm(key).as_str() {
+        "fit" => Ok(AlbumLayout { cols: 1, rows: 1, per: 1, title: false, fit: true }),
+        "1" | "one" => Ok(AlbumLayout { cols: 1, rows: 1, per: 1, title: false, fit: false }),
+        "1title" | "onetitle" => Ok(AlbumLayout { cols: 1, rows: 1, per: 1, title: true, fit: false }),
+        "2" | "two" => Ok(AlbumLayout { cols: 2, rows: 1, per: 2, title: false, fit: false }),
+        "2title" | "twotitle" => Ok(AlbumLayout { cols: 2, rows: 1, per: 2, title: true, fit: false }),
+        "4" | "four" => Ok(AlbumLayout { cols: 2, rows: 2, per: 4, title: false, fit: false }),
+        "4title" | "fourtitle" => Ok(AlbumLayout { cols: 2, rows: 2, per: 4, title: true, fit: false }),
+        _ => Err(bad("insert.photoAlbum", format!("unknown layout `{key}` (use fit, 1, 2, 4, 1title, 2title or 4title)"))),
+    }
+}
+
+fn album_frame(p: &Value) -> Result<AlbumFrame> {
+    let key = match p.get("frame") {
+        None => return Ok(AlbumFrame::None),
+        Some(Value::String(s)) => s.as_str(),
+        Some(_) => return Err(bad("insert.photoAlbum", "`frame` must be text")),
+    };
+    match album_norm(key).as_str() {
+        "none" => Ok(AlbumFrame::None),
+        "rect" | "rectangle" => Ok(AlbumFrame::Rect),
+        "rounded" | "round" | "roundedrect" | "roundedrectangle" => Ok(AlbumFrame::Rounded),
+        "simple" | "simpleframe" | "simplewhite" | "white" => Ok(AlbumFrame::Simple),
+        _ => Err(bad("insert.photoAlbum", format!("unknown frame `{key}` (use none, rect, rounded or simple)"))),
+    }
+}
+
+fn album_captions(p: &Value) -> Result<bool> {
+    match p.get("captions") {
+        None => Ok(false),
+        Some(Value::Bool(v)) => Ok(*v),
+        Some(_) => Err(bad("insert.photoAlbum", "`captions` must be true or false")),
+    }
+}
+
+fn album_items(p: &Value) -> Result<Vec<AlbumItem>> {
+    let Some(arr) = p.get("pictures").and_then(Value::as_array) else {
+        return Err(bad("insert.photoAlbum", "`pictures` must be a list"));
+    };
+    if arr.is_empty() {
+        return Err(bad("insert.photoAlbum", "add at least one picture or text box"));
+    }
+    if arr.len() > ALBUM_MAX_ITEMS {
+        return Err(bad("insert.photoAlbum", "a photo album holds at most 48 pictures or text boxes"));
+    }
+    let mut items = Vec::with_capacity(arr.len());
+    let mut total = 0usize;
+    for item in arr {
+        let Some(obj) = item.as_object() else {
+            return Err(bad("insert.photoAlbum", "each album item must be a picture or a text box"));
+        };
+        let has_media = obj.contains_key("data") || obj.contains_key("path");
+        if !has_media {
+            let Some(text) = obj.get("text").and_then(Value::as_str) else {
+                return Err(bad("insert.photoAlbum", "each album item needs `path`, `data` or `text`"));
+            };
+            let text = text.trim();
+            if text.is_empty() {
+                return Err(bad("insert.photoAlbum", "a text box needs some text"));
+            }
+            if text.chars().count() > ALBUM_MAX_TEXT {
+                return Err(bad("insert.photoAlbum", "text is longer than 400 characters"));
+            }
+            items.push(AlbumItem::Text(text.to_string()));
+            continue;
+        }
+        let (name, bytes) = media_bytes(item, "insert.photoAlbum")?;
+        if bytes.len() > ALBUM_MAX_BYTES {
+            return Err(bad("insert.photoAlbum", format!("{name} is larger than 32 MB")));
+        }
+        let next = total.saturating_add(bytes.len());
+        if next > ALBUM_MAX_TOTAL {
+            return Err(bad("insert.photoAlbum", "the album is larger than 64 MB"));
+        }
+        total = next;
+        let ct = content_type(&name, &bytes);
+        if !ct.starts_with("image/") {
+            return Err(bad("insert.photoAlbum", format!("{name} is not a picture")));
+        }
+        if ct != "image/svg+xml" && deckcraft_render::decode_image(&bytes).is_none() {
+            return Err(bad("insert.photoAlbum", format!("{name}: the picture can't be read")));
+        }
+        let (px_w, px_h) = image_px(&bytes);
+        items.push(AlbumItem::Picture(AlbumPic { name, bytes, px_w, px_h }));
+    }
+    Ok(items)
+}
+
+fn image_px(bytes: &[u8]) -> (f64, f64) {
+    image::ImageReader::new(std::io::Cursor::new(bytes))
+        .with_guessed_format()
+        .ok()
+        .and_then(|r| r.into_dimensions().ok())
+        .map(|(w, h)| (w as f64, h as f64))
+        .filter(|(w, h)| *w > 0.0 && *h > 0.0)
+        .unwrap_or((4.0, 3.0))
+}
+
+fn file_stem(name: &str) -> String {
+    let base = std::path::Path::new(name).file_name().and_then(|n| n.to_str()).unwrap_or(name);
+    let stem = match base.rsplit_once('.') {
+        Some((s, ext)) if !s.is_empty() && !ext.is_empty() => s,
+        _ => base,
+    };
+    if stem.is_empty() { "Picture".to_string() } else { stem.to_string() }
+}
+
+fn album_plan(items: Vec<AlbumItem>, per: usize) -> Vec<AlbumSlide> {
+    let per = per.max(1);
+    let mut out = Vec::new();
+    let mut batch = Vec::new();
+    for item in items {
+        match item {
+            AlbumItem::Text(text) => {
+                if !batch.is_empty() {
+                    out.push(AlbumSlide::Pictures(std::mem::take(&mut batch)));
+                }
+                out.push(AlbumSlide::Text(text));
+            }
+            AlbumItem::Picture(pic) => {
+                batch.push(pic);
+                if batch.len() >= per {
+                    out.push(AlbumSlide::Pictures(std::mem::take(&mut batch)));
+                }
+            }
+        }
+    }
+    if !batch.is_empty() {
+        out.push(AlbumSlide::Pictures(batch));
+    }
+    out
+}
+
+struct Placed {
+    pic: [f64; 4],
+    caption: Option<[f64; 4]>,
+}
+
+fn fit_in(box_w: f64, box_h: f64, px_w: f64, px_h: f64) -> (f64, f64) {
+    let aspect = if px_h > 0.0 { px_w / px_h } else { 4.0 / 3.0 };
+    let box_w = box_w.max(1.0);
+    let box_h = box_h.max(1.0);
+    if !aspect.is_finite() || aspect <= 0.0 {
+        return (box_w, box_h);
+    }
+    if aspect >= box_w / box_h { (box_w, (box_w / aspect).max(1.0)) } else { ((box_h * aspect).max(1.0), box_h) }
+}
+
+fn place_album(width: f64, height: f64, layout: AlbumLayout, n: usize, captions: bool) -> (Option<[f64; 4]>, Vec<Placed>) {
+    let margin = if layout.fit { 18.0 } else { 36.0 };
+    let title_band = if layout.title { 48.0 } else { 0.0 };
+    let gap = 12.0;
+    let cap_h = 22.0;
+    let cap_gap = 4.0;
+    let left = margin;
+    let top = margin + title_band;
+    let grid_w = (width - margin - left).max(1.0);
+    let grid_h = (height - margin - top).max(1.0);
+    let cols = layout.cols.max(1);
+    let rows = layout.rows.max(1);
+    let cell_w = ((grid_w - gap * (cols.saturating_sub(1) as f64)) / cols as f64).max(1.0);
+    let cell_h = ((grid_h - gap * (rows.saturating_sub(1) as f64)) / rows as f64).max(1.0);
+    let pic_h = if captions { (cell_h - cap_h - cap_gap).max(1.0) } else { cell_h };
+    let mut placed = Vec::with_capacity(n);
+    for i in 0..n {
+        let col = i % cols;
+        let row = i / cols;
+        if row >= rows {
+            break;
+        }
+        let cell_x = left + col as f64 * (cell_w + gap);
+        let cell_y = top + row as f64 * (cell_h + gap);
+        placed.push(Placed { pic: [cell_x, cell_y, cell_w, pic_h], caption: None });
+    }
+    let title = if layout.title { Some([margin, 8.0, (width - 2.0 * margin).max(1.0), 32.0]) } else { None };
+    (title, placed)
+}
+
+fn place_pictures(width: f64, height: f64, layout: AlbumLayout, pics: &[AlbumPic], captions: bool) -> (Option<[f64; 4]>, Vec<Placed>) {
+    let (title, slots) = place_album(width, height, layout, pics.len(), captions);
+    let placed = pics
+        .iter()
+        .zip(slots)
+        .map(|(pic, slot)| {
+            let (dw, dh) = fit_in(slot.pic[2], slot.pic[3], pic.px_w, pic.px_h);
+            let x = slot.pic[0] + (slot.pic[2] - dw) / 2.0;
+            let y = slot.pic[1] + (slot.pic[3] - dh) / 2.0;
+            let caption = if captions { Some([x, y + dh + 4.0, dw.max(36.0), 22.0]) } else { None };
+            Placed { pic: [x, y, dw, dh], caption }
+        })
+        .collect();
+    (title, placed)
+}
+
+fn apply_frame(s: &mut Session, frame: AlbumFrame, id: u64) -> Result<()> {
+    let params = match frame {
+        AlbumFrame::None => return Ok(()),
+        AlbumFrame::Rect => json!({"id": id, "color": "#1A1A1A", "width": 1.5}),
+        AlbumFrame::Rounded => json!({"id": id, "color": "#1A1A1A", "width": 2.25, "join": "round"}),
+        AlbumFrame::Simple => json!({"id": id, "color": "#FFFFFF", "width": 6.0}),
+    };
+    s.execute("shape.line", &params)?;
+    Ok(())
+}
+
+fn insert_album(s: &mut Session, items: Vec<AlbumItem>, layout: AlbumLayout, frame: AlbumFrame, captions: bool) -> Result<Value> {
+    let (width, height, first) = {
+        let st = s.doc()?;
+        let first = if st.doc.slides.is_empty() { 0 } else { st.selection.slide.saturating_add(1) };
+        (st.doc.slide_size.width, st.doc.slide_size.height, first)
+    };
+    let plan = album_plan(items, layout.per);
+    let mut slides = 0usize;
+    let mut pictures = 0usize;
+    for slide in plan {
+        s.execute("slide.new", &json!({"layout": "blank"}))?;
+        slides += 1;
+        match slide {
+            AlbumSlide::Text(text) => {
+                let rect = if layout.title {
+                    [36.0, 18.0, (width - 72.0).max(36.0), 48.0]
+                } else {
+                    [36.0, 36.0, (width - 72.0).max(36.0), (height - 72.0).max(36.0)]
+                };
+                s.execute("insert.textBox", &json!({"rect": rect, "text": text}))?;
+            }
+            AlbumSlide::Pictures(pics) => {
+                let stem = pics.first().map(|p| file_stem(&p.name)).unwrap_or_default();
+                let (title, placed) = place_pictures(width, height, layout, &pics, captions);
+                for (pic, cell) in pics.iter().zip(placed) {
+                    let data = base64_encode(&pic.bytes);
+                    let inserted = s.execute("insert.picture", &json!({"name": pic.name, "data": data, "rect": cell.pic}))?;
+                    let Some(id) = inserted.get("id").and_then(Value::as_u64) else {
+                        return Err(bad("insert.photoAlbum", "the picture was not inserted"));
+                    };
+                    apply_frame(s, frame, id)?;
+                    pictures += 1;
+                    if let Some(cap) = cell.caption {
+                        s.execute("insert.textBox", &json!({"rect": cap, "text": file_stem(&pic.name)}))?;
+                    }
+                }
+                if let Some(rect) = title {
+                    s.execute("insert.textBox", &json!({"rect": rect, "text": stem}))?;
+                }
+            }
+        }
+    }
+    s.execute("slide.go", &json!({"index": first}))?;
+    Ok(json!({"slides": slides, "first": first, "pictures": pictures}))
+}
+
 fn table(s: &mut Session, p: &Value) -> Result<Value> {
     let rows = usize_param(p, "rows").unwrap_or(2).clamp(1, 75);
     let cols = usize_param(p, "cols").unwrap_or(2).clamp(1, 75);
@@ -798,3 +1137,161 @@ fn smart_art(s: &mut Session, p: &Value) -> Result<Value> {
     }
     Ok(g)
 }
+
+#[cfg(test)]
+mod tests {
+    use deckcraft_model::ShapeKind;
+    use deckcraft_model::style::LineJoin;
+
+    use super::*;
+
+    /// 8×8 red PNG.
+    fn png() -> Vec<u8> {
+        vec![
+            137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 0, 8, 0, 0, 0, 8, 8, 2, 0, 0, 0, 75, 109, 41, 220, 0, 0, 0, 17, 73,
+            68, 65, 84, 120, 156, 99, 184, 163, 161, 129, 21, 49, 12, 45, 9, 0, 123, 123, 75, 1, 251, 162, 81, 240, 0, 0, 0, 0, 73, 69, 78, 68, 174,
+            66, 96, 130,
+        ]
+    }
+
+    fn pic(name: &str) -> Value {
+        json!({"name": name, "data": base64_encode(&png())})
+    }
+
+    fn n_slides(s: &Session) -> usize {
+        s.active().map(|d| d.doc.slides.len()).unwrap_or(0)
+    }
+
+    fn pictures(s: &Session, index: usize) -> Vec<deckcraft_model::Shape> {
+        s.active()
+            .and_then(|d| d.doc.slides.get(index))
+            .map(|sl| sl.shapes.iter().filter(|sh| matches!(sh.kind, ShapeKind::Picture { .. })).cloned().collect())
+            .unwrap_or_default()
+    }
+
+    fn box_text(s: &Session, index: usize) -> Vec<String> {
+        s.active()
+            .and_then(|d| d.doc.slides.get(index))
+            .map(|sl| sl.shapes.iter().filter(|sh| sh.text_box).filter_map(|sh| sh.text.as_ref().map(|t| t.text())).collect())
+            .unwrap_or_default()
+    }
+
+    #[test]
+    fn two_pictures_one_per_slide_are_one_undo() {
+        let mut s = Session::with_new();
+        let before = n_slides(&s);
+        let r = s.execute("insert.photoAlbum", &json!({"pictures": [pic("hill.png"), pic("lake.png")], "layout": "1"})).expect("album");
+        assert_eq!(r["slides"], 2);
+        assert_eq!(n_slides(&s), before + 2);
+        assert_eq!(pictures(&s, 1).len(), 1);
+        assert_eq!(pictures(&s, 2).len(), 1);
+        assert_eq!(s.active().unwrap().selection.slide, 1);
+        let undo = &s.active().unwrap().history.undo;
+        assert_eq!(undo.len(), 1);
+        assert_eq!(undo[0].label, "Photo Album…");
+        s.execute("edit.undo", &json!({})).expect("undo");
+        assert_eq!(n_slides(&s), before);
+        assert!(pictures(&s, 1).is_empty());
+    }
+
+    #[test]
+    fn two_up_shares_one_slide() {
+        let mut s = Session::with_new();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png"), pic("b.png")], "layout": "2"})).expect("album");
+        assert_eq!(n_slides(&s), 2);
+        assert_eq!(pictures(&s, 1).len(), 2);
+        assert!(box_text(&s, 1).is_empty());
+    }
+
+    #[test]
+    fn captions_and_titles_use_the_file_stem() {
+        let mut s = Session::with_new();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("harbor.png")], "layout": "1", "captions": true})).expect("captions");
+        assert_eq!(box_text(&s, 1), ["harbor"]);
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("harbor.png")], "layout": "1title"})).expect("title");
+        assert_eq!(box_text(&s, 1), ["harbor"]);
+        assert_eq!(pictures(&s, 1).len(), 1);
+        let pic_y = pictures(&s, 1)[0].xfrm.unwrap().y;
+        assert!(pic_y > 40.0, "the picture sits below the title");
+    }
+
+    #[test]
+    fn frames_set_the_picture_line() {
+        let mut s = Session::with_new();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "frame": "rect"})).expect("rect");
+        let line = pictures(&s, 1)[0].line.clone().expect("line");
+        assert_eq!(line.width, Some(1.5));
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "frame": "rounded"})).expect("rounded");
+        let line = pictures(&s, 1)[0].line.clone().expect("line");
+        assert_eq!(line.width, Some(2.25));
+        assert_eq!(line.join, Some(LineJoin::Round));
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "frame": "simple"})).expect("simple");
+        assert_eq!(pictures(&s, 1)[0].line.as_ref().and_then(|l| l.width), Some(6.0));
+    }
+
+    #[test]
+    fn a_text_box_breaks_the_picture_row() {
+        let mut s = Session::with_new();
+        let r = s
+            .execute("insert.photoAlbum", &json!({"pictures": [pic("a.png"), {"text": "A day on the water"}, pic("b.png")], "layout": "2"}))
+            .expect("album");
+        assert_eq!(r["slides"], 3);
+        assert_eq!(pictures(&s, 1).len(), 1);
+        assert_eq!(box_text(&s, 2), ["A day on the water"]);
+        assert!(pictures(&s, 2).is_empty());
+        assert_eq!(pictures(&s, 3).len(), 1);
+        assert_eq!(s.active().unwrap().history.undo.len(), 1);
+    }
+
+    #[test]
+    fn no_pictures_opens_the_dialog_without_editing() {
+        let mut s = Session::with_new();
+        let before = n_slides(&s);
+        let r = s.execute("insert.photoAlbum", &json!({})).expect("open");
+        assert_eq!(r["dialog"], "photoAlbum");
+        assert_eq!(n_slides(&s), before);
+        assert!(s.active().unwrap().history.undo.is_empty());
+        assert_eq!(s.ui_requests.len(), 1);
+        match &s.ui_requests[0] {
+            crate::UiRequest::Dialog { id, .. } => assert_eq!(id, "photoAlbum"),
+            other => panic!("dialog request, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn bad_input_adds_no_slides() {
+        let mut s = Session::with_new();
+        let before = n_slides(&s);
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": [], "layout": "1"})).is_err());
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "layout": "grid"})).is_err());
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "frame": "glow"})).is_err());
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "captions": "yes"})).is_err());
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": [{"name": "notes.txt", "data": base64_encode(b"hello")}]} )).is_err());
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": [{"text": "  "}]})).is_err());
+        let mut many = Vec::new();
+        for i in 0..49 {
+            many.push(json!({"text": format!("box {i}")}));
+        }
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": many})).is_err());
+        assert_eq!(n_slides(&s), before);
+        assert!(s.active().unwrap().history.undo.is_empty());
+    }
+
+    #[test]
+    fn fit_is_larger_than_one_picture_and_four_up_is_one_slide() {
+        let mut s = Session::with_new();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "layout": "1"})).unwrap();
+        let one = pictures(&s, 1)[0].xfrm.unwrap().h;
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "layout": "fit"})).unwrap();
+        let fitted = pictures(&s, 1)[0].xfrm.unwrap().h;
+        assert!(fitted > one, "fit {fitted} should be taller than one-up {one}");
+        s.execute("edit.undo", &json!({})).unwrap();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png"), pic("b.png"), pic("c.png"), pic("d.png")], "layout": "4"})).unwrap();
+        assert_eq!(n_slides(&s), 2);
+        assert_eq!(pictures(&s, 1).len(), 4);
+    }
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..eda8a436 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -47,6 +47,7 @@ fn title(id: &str) -> &'static str {
         "preferences" => "Preferences",
         "export" => "Export",
         "symbol" => "Symbol",
+        "photoAlbum" => "Photo Album",
         "equation" => "Equation",
         "spelling" => "Spelling",
         "accessibility" => "Accessibility Checker",
@@ -117,6 +118,189 @@ fn num(d: &mut Dialog, key: &str, default: f64) -> f64 {
     d.get(key, "").trim().trim_end_matches(['"', '%', ' ']).parse::<f64>().ok().filter(|v| v.is_finite()).unwrap_or(default)
 }
 
+fn album_items(d: &Dialog) -> Option<Vec<Value>> {
+    let raw = d.fields.get("items").map(String::as_str).unwrap_or("[]");
+    serde_json::from_str::<Value>(raw).ok().and_then(|v| v.as_array().cloned())
+}
+
+fn store_album_items(d: &mut Dialog, items: &[Value]) {
+    let raw = serde_json::to_string(items).unwrap_or_else(|_| "[]".into());
+    d.fields.insert("items".into(), raw);
+}
+
+fn album_item_label(v: &Value) -> String {
+    if let Some(text) = v.get("text").and_then(Value::as_str) {
+        let text = text.trim();
+        if text.is_empty() { "Text Box".to_string() } else { format!("Text: {text}") }
+    } else {
+        v.get("name").and_then(Value::as_str).filter(|s| !s.is_empty()).unwrap_or("Picture").to_string()
+    }
+}
+
+fn pick_album_picture(app: &mut SlideApp) -> Option<Value> {
+    let path = if let Some(pick) = app.services.pick_open.as_mut() {
+        pick("picture")
+    } else {
+        app.set_status("Pass pictures to insert.photoAlbum");
+        None
+    };
+    let path = path?;
+    let loaded = if let Some(read) = app.services.read.as_ref() {
+        match read(&path) {
+            Ok(bytes) => bytes,
+            Err(e) => {
+                app.set_status(e);
+                return None;
+            }
+        }
+    } else {
+        #[cfg(not(target_arch = "wasm32"))]
+        {
+            match std::fs::read(&path) {
+                Ok(bytes) => bytes,
+                Err(e) => {
+                    app.set_status(format!("{path}: {e}"));
+                    return None;
+                }
+            }
+        }
+        #[cfg(target_arch = "wasm32")]
+        {
+            app.set_status("The web build inserts album pictures from data passed to insert.photoAlbum");
+            return None;
+        }
+    };
+    if loaded.is_empty() {
+        app.set_status("That file is empty");
+        return None;
+    }
+    if loaded.len() > 32 * 1024 * 1024 {
+        app.set_status("That picture is larger than 32 MB");
+        return None;
+    }
+    let name = std::path::Path::new(&path).file_name().and_then(|n| n.to_str()).filter(|s| !s.is_empty()).unwrap_or("picture").to_string();
+    Some(json!({"name": name, "data": deckcraft_engine::cmd::base64_encode(&loaded)}))
+}
+
+fn album_choice(ui: &mut Ui, d: &mut Dialog, id: &str, key: &str, default: &str, choices: &[(&str, &str)]) {
+    let cur = d.get(key, default);
+    let label = choices.iter().find(|(k, _)| *k == cur).map(|(_, l)| *l).unwrap_or(default);
+    egui::ComboBox::from_id_salt(id).selected_text(label).width(220.0).show_ui(ui, |ui| {
+        for (k, l) in choices {
+            if ui.selectable_label(cur == *k, *l).clicked() {
+                d.fields.insert(key.into(), (*k).to_string());
+            }
+        }
+    });
+}
+
+/// Photo Album. Returns true when the dialog should close.
+fn photo_album_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    ui.set_min_width(400.0);
+    ui.label("Pictures in album");
+    let items = album_items(d).unwrap_or_default();
+    let mut sel = d.get("sel", "0").parse::<usize>().unwrap_or(0);
+    egui::ScrollArea::vertical().max_height(140.0).id_salt("album_list").show(ui, |ui| {
+        if items.is_empty() {
+            ui.label(egui::RichText::new("No pictures yet").color(Tokens::get(ui.ctx()).text_dim));
+        }
+        for (i, item) in items.iter().enumerate() {
+            if ui.selectable_label(sel == i, album_item_label(item)).clicked() {
+                sel = i;
+            }
+        }
+    });
+    d.fields.insert("sel".into(), sel.to_string());
+    ui.horizontal(|ui| {
+        if ui.button("Add Pictures…").clicked()
+            && let Some(item) = pick_album_picture(app)
+        {
+            match album_items(d) {
+                Some(mut list) if list.len() < 48 => {
+                    list.push(item);
+                    let next = list.len().saturating_sub(1);
+                    store_album_items(d, &list);
+                    d.fields.insert("sel".into(), next.to_string());
+                }
+                Some(_) => app.set_status("A photo album holds at most 48 pictures or text boxes"),
+                None => app.set_status("The picture list is invalid"),
+            }
+        }
+        if ui.button("New Text Box").clicked() {
+            let text = d.get("boxText", "Text Box");
+            let text = text.trim();
+            if text.is_empty() {
+                app.set_status("Type the text for the new text box");
+            } else if text.chars().count() > 400 {
+                app.set_status("Text is longer than 400 characters");
+            } else if let Some(mut list) = album_items(d) {
+                if list.len() >= 48 {
+                    app.set_status("A photo album holds at most 48 pictures or text boxes");
+                } else {
+                    list.push(json!({"text": text}));
+                    let next = list.len().saturating_sub(1);
+                    store_album_items(d, &list);
+                    d.fields.insert("sel".into(), next.to_string());
+                }
+            }
+        }
+        if ui.button("Remove").clicked()
+            && let Some(mut list) = album_items(d)
+            && let Some(i) = d.get("sel", "0").parse::<usize>().ok()
+            && i < list.len()
+        {
+            list.remove(i);
+            store_album_items(d, &list);
+            let next = i.min(list.len().saturating_sub(1));
+            d.fields.insert("sel".into(), next.to_string());
+        }
+    });
+    field(ui, d, "Text box:", "boxText", "Text Box");
+    ui.add_space(4.0);
+    ui.label("Picture layout");
+    album_choice(
+        ui,
+        d,
+        "album_layout",
+        "layout",
+        "1",
+        &[
+            ("fit", "Fit to slide"),
+            ("1", "1 picture"),
+            ("2", "2 pictures"),
+            ("4", "4 pictures"),
+            ("1title", "1 picture with title"),
+            ("2title", "2 pictures with title"),
+            ("4title", "4 pictures with title"),
+        ],
+    );
+    ui.label("Frame shape");
+    album_choice(
+        ui,
+        d,
+        "album_frame",
+        "frame",
+        "rect",
+        &[("none", "None"), ("rect", "Rectangle"), ("rounded", "Rounded"), ("simple", "Simple, white")],
+    );
+    let captions = check(ui, d, "Captions under pictures", "captions", false);
+    let (ok, cancel) = buttons(ui, "Create");
+    if ok {
+        let Some(list) = album_items(d) else {
+            app.set_status("The picture list is invalid");
+            return false;
+        };
+        if list.is_empty() {
+            app.set_status("Add a picture or a text box first");
+            return false;
+        }
+        let layout = d.get("layout", "1");
+        let frame = d.get("frame", "rect");
+        return app.run("insert.photoAlbum", json!({"pictures": list, "layout": layout, "frame": frame, "captions": captions})).is_ok();
+    }
+    cancel
+}
+
 /// Returns true when the dialog should close.
 fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     let run = |app: &mut SlideApp, id: &str, p: Value| {
@@ -730,6 +914,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             let (ok, _) = buttons(ui, "Done");
             ok
         }
+        "photoAlbum" => photo_album_dialog(app, ui, d),
         _ => {
             ui.label(format!("“{}” is not available yet.", d.id));
             let (ok, cancel) = buttons(ui, "OK");
@@ -829,3 +1014,7 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+#[path = "photo_album_tests.rs"]
+mod photo_album_tests;
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..9c4f7b4f 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -215,6 +215,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Table…", "insert.table"),
                 ("Chart", "insert.chart"),
                 ("Picture from File…", "app.insertPictureDialog"),
+                ("Photo Album…", "insert.photoAlbum"),
                 ("Audio from File…", "app.insertAudioDialog"),
                 ("Video from File…", "app.insertVideoDialog"),
             ],
diff --git a/crates/ui-egui/src/photo_album_tests.rs b/crates/ui-egui/src/photo_album_tests.rs
new file mode 100644
index 00000000..fbd4e2c7
--- /dev/null
+++ b/crates/ui-egui/src/photo_album_tests.rs
@@ -0,0 +1,90 @@
+//! Photo Album dialog: the Insert ribbon opens it, and Create inserts the pictures in one step.
+
+use deckcraft_engine::Session;
+use deckcraft_model::ShapeKind;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+/// 8×8 red PNG.
+fn png() -> Vec<u8> {
+    vec![
+        137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 0, 8, 0, 0, 0, 8, 8, 2, 0, 0, 0, 75, 109, 41, 220, 0, 0, 0, 17, 73, 68,
+        65, 84, 120, 156, 99, 184, 163, 161, 129, 21, 49, 12, 45, 9, 0, 123, 123, 75, 1, 251, 162, 81, 240, 0, 0, 0, 0, 73, 69, 78, 68, 174, 66, 96,
+        130,
+    ]
+}
+
+fn harness(app: SlideApp) -> Harness<'static, SlideApp> {
+    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn slides(h: &Harness<'_, SlideApp>) -> usize {
+    h.state().session.active().map(|d| d.doc.slides.len()).unwrap_or(0)
+}
+
+#[test]
+fn insert_ribbon_opens_the_dialog_without_editing() {
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.ui.tab = "Insert".into();
+    let mut h = harness(app);
+    h.get_by_label("Photo Album…").click();
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("photoAlbum"));
+    assert_eq!(slides(&h), 1);
+    assert!(h.state().session.active().unwrap().history.undo.is_empty());
+}
+
+#[test]
+fn create_inserts_the_album_in_one_step() {
+    let bytes = png();
+    let services = Services {
+        pick_open: Some(Box::new(|_| Some("/tmp/cat.png".into()))),
+        read: Some(Box::new(move |_| Ok(bytes.clone()))),
+        ..Default::default()
+    };
+    let mut app = SlideApp::new(Session::with_new(), services);
+    app.run("insert.photoAlbum", json!({})).expect("open");
+    let mut h = harness(app);
+    h.get_by_label("Add Pictures…").click();
+    h.run_steps(2);
+    assert!(h.query_by_label("cat.png").is_some(), "the chosen file is listed");
+    h.get_by_label("New Text Box").click();
+    h.run_steps(2);
+    assert!(h.query_by_label("Text: Text Box").is_some());
+    h.get_by_label("Create").click();
+    h.run_steps(4);
+    assert!(h.state().dialog.is_none(), "Create closes the dialog");
+    assert_eq!(slides(&h), 3);
+    let st = h.state().session.active().unwrap();
+    assert_eq!(st.history.undo.len(), 1);
+    assert_eq!(st.history.undo[0].label, "Photo Album…");
+    let pics: Vec<_> = st.doc.slides[1].shapes.iter().filter(|sh| matches!(sh.kind, ShapeKind::Picture { .. })).collect();
+    assert_eq!(pics.len(), 1);
+    assert_eq!(pics[0].line.as_ref().and_then(|l| l.width), Some(1.5));
+    let text: Vec<_> = st.doc.slides[2].shapes.iter().filter(|sh| sh.text_box).filter_map(|sh| sh.text.as_ref().map(|t| t.text())).collect();
+    assert_eq!(text, ["Text Box"]);
+}
+
+#[test]
+fn create_with_nothing_keeps_the_dialog() {
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.run("insert.photoAlbum", json!({})).expect("open");
+    let mut h = harness(app);
+    h.get_by_label("Create").click();
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("photoAlbum"));
+    assert_eq!(slides(&h), 1);
+    let status = h.state().status.as_ref().map(|s| s.0.as_str()).unwrap_or("");
+    assert!(status.contains("picture") || status.contains("text"), "{status}");
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..ea2d0229 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -234,6 +234,16 @@ fn big(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, id: &str, p: Va
     }
 }
 
+/// Like [`big`], with an accesskit name (the painted label can be two lines).
+fn big_labeled(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, access: &str, id: &str, p: Value) {
+    let en = enabled(app, id);
+    let resp = big_button(ui, icon, label, en).on_hover_text(tip(id, access));
+    resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, en, access));
+    if resp.clicked() {
+        run(app, id, p);
+    }
+}
+
 fn small(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, id: &str, p: Value) {
     let en = enabled(app, id);
     if small_button(ui, icon, label, en, false).on_hover_text(tip(id, label)).clicked() {
@@ -1031,6 +1041,7 @@ fn insert(app: &mut SlideApp, ui: &mut Ui) {
     });
     group(ui, |ui| {
         big(app, ui, Icon::Picture, "Pictures", "app.insertPictureDialog", json!({}));
+        big_labeled(app, ui, Icon::Picture, "Photo\nAlbum", "Photo Album…", "insert.photoAlbum", json!({}));
         let r = big_button(ui, Icon::Screenshot, "Screenshot", false);
         let _ = r.on_hover_text("Screenshot (not available yet)");
     });
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..306a6ed0 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog, `insert.photoAlbum`; 227 commands, 28 dialogs; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -20,8 +20,8 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Photo Album dialog and `insert.photoAlbum` (227 commands, 28 dialogs) |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..bfacb0ab 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album is one of 28 dialogs; Font, Bullets, Find, Replace Fonts, Action Settings, Print and Insert Object remain; previous: minor, 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,8 +203,8 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Photo Album is one of them). Still missing Font,
+  Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object…. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Photo Album dialog counted (28 vs ~60). Font, Bullets, Find, Replace Fonts, Action Settings, Print and Insert Object remain |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..5004423a 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (automation 227 commands; breadth stays 79%, ready ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -239,7 +239,7 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 226 commands, every one reachable from `deckcraft-cli`, the JSON control channel
+- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
   and MCP.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Working today: 227 commands. Breadth stays 79%, ready ~55%. The d556ff9 snapshot (226 commands, 27 dialogs) is unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..d3b62fd0 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog; 28 dialogs; breadth stays 79%, UI ~60%; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Photo Album, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Photo Album, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Photo Album dialog (28 dialogs). Breadth stays 79%, UI ~60% |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From ba71a40a39f4d1501251670fec431f8aee202a0d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:48:39 +0300
Subject: [PATCH 253/376] Canvas: a trackpad swipe turns the page

A sideways flick changes slides when the slide fits the window, and any
flick does so during the show. One gesture turns one page. A zoomed slide
still pans. Pinch-zoom is unchanged.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                   |   1 +
 crates/ui-egui/src/canvas.rs |  25 ++++++--
 crates/ui-egui/src/lib.rs    | 110 +++++++++++++++++++++++++++++++++++
 crates/ui-egui/src/show.rs   |  21 +++++++
 docs/gaps.md                 |   6 +-
 docs/hardware-parity.md      |   6 +-
 docs/slideshow-parity.md     |   3 +-
 7 files changed, 162 insertions(+), 10 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..26ad6c97 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | A trackpad swipe turns the page: sideways when the slide fits the window, and any flick during the slide show. One gesture turns one page. Pinch-zoom is unchanged |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..5aa2ee51 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -53,6 +53,17 @@ pub fn layout(app: &SlideApp, avail: Rect) -> (Rect, f32) {
     (r, scale)
 }
 
+/// A trackpad flick or mouse-wheel notch that should turn the page.
+///
+/// The stronger axis wins, so a sideways swipe is not read as a vertical scroll. Negative
+/// movement — the content moves left or up, which is a swipe left or up with natural scrolling —
+/// is the next slide. A nudge under 18 points is ignored so a resting finger does not change slides.
+pub(crate) fn page_flick(wheel: egui::Vec2) -> Option<bool> {
+    const MIN_FLICK: f32 = 18.0;
+    let along = if wheel.x.abs() > wheel.y.abs() { wheel.x } else { wheel.y };
+    (along.abs() > MIN_FLICK).then_some(along < 0.0)
+}
+
 pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
     let avail = ui.available_rect_before_wrap();
@@ -80,15 +91,19 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
             let _ = pinch_pos;
         } else if overflow != egui::Vec2::ZERO {
             offset -= wheel;
-        } else if wheel.y.abs() > 18.0 && app.session.tool.marquee.is_none() && !app.session.tool.dragging() {
-            // Wheel over a fitted slide pages through slides (like PowerPoint).
-            let id = if wheel.y < 0.0 { "slide.next" } else { "slide.previous" };
+        } else if app.session.tool.marquee.is_none()
+            && !app.session.tool.dragging()
+            && let Some(next) = page_flick(wheel)
+        {
+            // A fitted slide: the mouse wheel and a trackpad swipe turn the page. Pinch zoom is
+            // the branch above and is left alone.
             let gate = ui.id().with("wheel_gate");
-            let last: f64 = ui.data_mut(|d| d.get_temp(gate).unwrap_or(0.0));
+            // No previous flick yet: the first one must turn the page, not wait out the gap.
+            let last: f64 = ui.data_mut(|d| d.get_temp(gate).unwrap_or(f64::NEG_INFINITY));
             let now = ui.input(|i| i.time);
             if now - last > 0.35 {
                 ui.data_mut(|d| d.insert_temp(gate, now));
-                let _ = app.run(id, json!({}));
+                let _ = app.run(if next { "slide.next" } else { "slide.previous" }, json!({}));
             }
         }
     }
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..94a05f4b 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1408,4 +1408,114 @@ mod tests {
         harness.run_steps(3);
         assert_eq!(harness.state().textures.canvas_renders, n, "an unchanged slide isn't rendered again");
     }
+
+    fn flick_harness() -> egui_kittest::Harness<'static, SlideApp> {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        // Fitted: the slide is smaller than the window, so a flick turns the page instead of panning.
+        harness.state_mut().ui.zoom = Some(0.4);
+        harness
+    }
+
+    fn slide_at(app: &SlideApp) -> usize {
+        app.session.active().unwrap().selection.slide
+    }
+
+    /// One frame of a trackpad flick: four short samples, each under egui's cutoff for smoothing a
+    /// mouse notch. The harness runs one frame per queued event, so they have to share a frame or
+    /// none of them reaches the page threshold.
+    fn flick(harness: &mut egui_kittest::Harness<'static, SlideApp>, delta: egui::Vec2) {
+        let centre = harness.state().canvas_rect.unwrap_or(egui::Rect::from_min_size(egui::Pos2::ZERO, egui::vec2(1200.0, 800.0))).center();
+        let input = harness.input_mut();
+        input.events.push(egui::Event::PointerMoved(centre));
+        let step = delta / 4.0;
+        for _ in 0..4 {
+            input.events.push(egui::Event::MouseWheel {
+                unit: egui::MouseWheelUnit::Point,
+                delta: step,
+                phase: egui::TouchPhase::Move,
+                modifiers: egui::Modifiers::NONE,
+            });
+        }
+        harness.run_steps(1);
+    }
+
+    #[test]
+    fn page_flick_uses_the_stronger_axis() {
+        assert_eq!(crate::canvas::page_flick(egui::vec2(-24.0, -4.0)), Some(true));
+        assert_eq!(crate::canvas::page_flick(egui::vec2(24.0, 4.0)), Some(false));
+        assert_eq!(crate::canvas::page_flick(egui::vec2(-4.0, -24.0)), Some(true));
+        assert_eq!(crate::canvas::page_flick(egui::vec2(4.0, 10.0)), None);
+    }
+
+    /// A sideways swipe on a fitted slide turns the page, like PowerPoint on a Mac trackpad.
+    /// The frames of one gesture do not skip ahead.
+    #[test]
+    fn a_sideways_trackpad_swipe_turns_the_page_and_a_second_flick_waits() {
+        let mut harness = flick_harness();
+        harness.state_mut().session.execute("slide.new", &json!({})).unwrap();
+        harness.state_mut().session.execute("slide.new", &json!({})).unwrap();
+        harness.state_mut().session.execute("slide.go", &json!({"index": 0})).unwrap();
+        harness.run_steps(1);
+        assert_eq!(slide_at(harness.state()), 0);
+
+        flick(&mut harness, egui::vec2(-24.0, 0.0));
+        assert_eq!(slide_at(harness.state()), 1, "swipe left goes to the next slide");
+
+        flick(&mut harness, egui::vec2(-24.0, 0.0));
+        assert_eq!(slide_at(harness.state()), 1, "the next frame of the same gesture does not skip a slide");
+
+        harness.run_steps(30);
+        flick(&mut harness, egui::vec2(24.0, 0.0));
+        assert_eq!(slide_at(harness.state()), 0, "swipe right goes back");
+    }
+
+    #[test]
+    fn a_vertical_wheel_still_turns_the_page_and_a_zoomed_slide_pans_instead() {
+        let mut harness = flick_harness();
+        harness.state_mut().session.execute("slide.new", &json!({})).unwrap();
+        harness.state_mut().session.execute("slide.go", &json!({"index": 0})).unwrap();
+        harness.run_steps(1);
+        flick(&mut harness, egui::vec2(-2.0, -24.0));
+        assert_eq!(slide_at(harness.state()), 1, "a vertical wheel still goes to the next slide");
+
+        harness.state_mut().ui.zoom = Some(3.0);
+        harness.state_mut().session.execute("slide.go", &json!({"index": 0})).unwrap();
+        harness.run_steps(2);
+        flick(&mut harness, egui::vec2(-24.0, 0.0));
+        assert_eq!(slide_at(harness.state()), 0, "zoomed in, a sideways swipe pans instead of turning the page");
+    }
+
+    #[test]
+    fn a_swipe_during_the_show_turns_the_page() {
+        let mut harness = flick_harness();
+        harness.state_mut().session.execute("slide.new", &json!({})).unwrap();
+        harness.state_mut().session.execute("slide.go", &json!({"index": 0})).unwrap();
+        harness.state_mut().start_show(0, true);
+        harness.run_steps(2);
+        flick(&mut harness, egui::vec2(-24.0, 0.0));
+        assert_eq!(harness.state().show.as_ref().map(|s| s.state.slide), Some(1));
+        harness.run_steps(30);
+        flick(&mut harness, egui::vec2(24.0, 0.0));
+        assert_eq!(harness.state().show.as_ref().map(|s| s.state.slide), Some(0));
+    }
+
+    /// The pen is drawing. A flick must not turn the page out from under the stroke.
+    #[test]
+    fn the_pen_ignores_a_swipe_during_the_show() {
+        let mut harness = flick_harness();
+        harness.state_mut().session.execute("slide.new", &json!({})).unwrap();
+        harness.state_mut().start_show(0, true);
+        harness.run_steps(2);
+        harness.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::P);
+        harness.run_steps(1);
+        flick(&mut harness, egui::vec2(-24.0, 0.0));
+        assert_eq!(harness.state().show.as_ref().map(|s| s.state.slide), Some(0));
+    }
 }
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..3d29387f 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -35,6 +35,8 @@ pub struct Show {
     show_start: f64,
     timings: Vec<(usize, f64)>,
     last_move: f64,
+    /// The last trackpad flick or mouse-wheel notch, so one gesture turns one page.
+    last_swipe: f64,
     pub ended: bool,
     /// The slide whose media was last started (auto-play runs once per visit).
     media_slide: Option<usize>,
@@ -95,6 +97,7 @@ impl Show {
             show_start: 0.0,
             timings: vec![],
             last_move: 0.0,
+            last_swipe: f64::NEG_INFINITY,
             ended: false,
             media_slide: None,
             last_viewed: None,
@@ -342,6 +345,24 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     if secondary && !show.ended {
         actions.push(show.state.prev(&doc));
     }
+    // A trackpad swipe (and the mouse wheel) turns the page. The pen is drawing, so a flick
+    // there stays on the slide. Pinch zoom is not a show gesture.
+    if !show.pen
+        && let Some(next) = crate::canvas::page_flick(ctx.input(|i| i.smooth_scroll_delta))
+        && now - show.last_swipe > 0.35
+    {
+        show.last_swipe = now;
+        if next {
+            if show.ended {
+                keep = false;
+            } else {
+                actions.push(show.state.next(&doc));
+            }
+        } else {
+            show.ended = false;
+            actions.push(show.state.prev(&doc));
+        }
+    }
     // Apply input first: a step started by this click must restart the clock before it is read.
     for a in actions.drain(..) {
         if !show.apply(a, &doc, now) {
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..459490e7 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a trackpad swipe turns the page in the editor and the show; pinch-zoom remains; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -217,7 +217,8 @@ Detail in [hardware-parity.md](hardware-parity.md).
   or wgpu path).
 - **Software-only video decode**; PowerPoint uses VideoToolbox/Media Foundation. 8–14 h (copy
   FilmCraft's hardware decode).
-- **No pen pressure or tilt for ink**; no pinch-zoom or trackpad gestures. 3–6 h.
+- **No pen pressure or tilt for ink**; no pinch-zoom. A trackpad swipe turns the page when the
+  slide fits the window, and during the show. 2–4 h for pinch-zoom.
 
 ## Localization
 
@@ -256,6 +257,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | A trackpad swipe (and the mouse wheel, in the show) turns the page. Pinch-zoom remains |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/hardware-parity.md b/docs/hardware-parity.md
index 5ba34cfc..21e8d401 100644
--- a/docs/hardware-parity.md
+++ b/docs/hardware-parity.md
@@ -1,6 +1,6 @@
 # Hardware parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a trackpad swipe turns the page; pinch-zoom remains; previous: minor, IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 
 What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
 ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -43,7 +43,8 @@ because it mostly follows from hardware use.
 |---|---|---|
 | Keyboard and presentation clickers (Page Up/Down, B, Esc) | yes | yes |
 | Mouse and trackpad scroll | yes | yes |
-| Pinch to zoom, two-finger gestures | yes | no |
+| Pinch to zoom | yes | no |
+| Two-finger swipe between slides | yes | yes: when the slide fits the window, and during the show. A zoomed slide still pans |
 | Pen pressure and tilt for ink (Apple Pencil via Sidecar, Windows Ink) | yes | no: ink strokes have constant width |
 | Touch screens (Windows) | yes | basic pointer only |
 | IME input methods for CJK text | yes | yes: composed in place, underlined, candidate window at the caret (#101) |
@@ -71,5 +72,6 @@ outlines every frame (#67, fix open), and the decoders run in software.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | A sideways trackpad swipe turns the page in Normal view (when the slide fits) and in the show. Pinch-zoom is unchanged |
 | 2026-10-12 | minor | IME input methods (#101) |
 | 2026-10-10 | major | Created: rendering, media, displays, input and performance against PowerPoint 16.113 |
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index fd981595..47e2ff2a 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a trackpad swipe or mouse wheel turns the page during the show; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -14,6 +14,7 @@ ready** (estimated), **10–16 h** to parity.
 |---|---|---|---|
 | Play from Start / from Current Slide (F5, Shift+F5, Cmd+Enter) | yes | yes | |
 | Next/previous by click, arrows, Space, Page Up/Down, Enter, Backspace | yes | yes | #17 reported arrows not working in v0.3.0 AppImage; recheck |
+| Next/previous by trackpad swipe or mouse wheel | yes | yes | One flick turns one page. The pen ignores the flick |
 | Go to slide (number + Enter), first/last | yes | yes | |
 | Black / white screen (B / W) | yes | yes | |
 | End screen, Esc to leave | yes | yes | |

From dac0d054feed859e0164dfbf15d4de8b6a0a5f27 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:53:53 +0300
Subject: [PATCH 254/376] Show: See All Slides and zoom
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

During a show, G opens a thumbnail grid and a click jumps to that slide.
Z then a click zooms the slide to 2×. Presenter view has Black, White,
All slides and Zoom. Esc closes the grid, then the zoom, before it leaves.
---
 ROADMAP.md                    |   2 +
 crates/ui-egui/src/control.rs |   8 +-
 crates/ui-egui/src/show.rs    | 509 ++++++++++++++++++++++++++++++++--
 docs/control-protocol.md      |   4 +-
 docs/roadmap.md               |   5 +-
 docs/slideshow-parity.md      |  14 +-
 docs/target-app-parity.md     |   9 +-
 7 files changed, 512 insertions(+), 39 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..22d31cf0 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | See All Slides and zoom during a show: a thumbnail grid (G, or All), click to jump, and click-to-zoom at 2× (Z). Presenter view has Black, White, All slides and Zoom. Breadth stays 79% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: See All Slides and zoom during a show. Breadth stays 79% |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/control.rs b/crates/ui-egui/src/control.rs
index d344d912..5fa12fd2 100644
--- a/crates/ui-egui/src/control.rs
+++ b/crates/ui-egui/src/control.rs
@@ -75,7 +75,13 @@ pub fn inspect(app: &SlideApp, ctx: &egui::Context) -> Value {
         "dialog": app.dialog.as_ref().map(|d| d.id.clone()),
         "home": app.backstage_open(),
         "backstage": app.backstage.as_ref().map(|b| b.page.id()),
-        "showing": app.show.as_ref().map(|s| json!({"slide": s.state.slide, "step": s.state.step, "ended": s.ended})),
+        "showing": app.show.as_ref().map(|s| {
+            let (n, aspect) = app.session.active().map(|d| {
+                let h = d.doc.slide_size.height.max(1.0) as f32;
+                (d.doc.slides.len(), d.doc.slide_size.width as f32 / h)
+            }).unwrap_or((0, 16.0 / 9.0));
+            s.showing_value(n, aspect, ctx.content_rect())
+        }),
         "documents": app.session.documents().iter().map(|d| json!({"title": d.title(), "dirty": d.is_dirty(), "path": d.path})).collect::<Vec<_>>(),
         "status": app.status.as_ref().map(|s| s.0.clone()),
         "perf": {"frameMs": app.perf.frame_ms, "renderMs": app.perf.render_ms, "fps": app.perf.fps},
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..1cca6d6b 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -1,5 +1,6 @@
 //! Slide Show: full-screen playback with transitions and animations (`deckcraft-anim`),
-//! keyboard/mouse navigation, pen, black/white screens, presenter view and rehearsed timings.
+//! keyboard/mouse navigation, pen, black/white screens, See All Slides, zoom, presenter view
+//! and rehearsed timings.
 
 use deckcraft_anim::{Layer, LinkJump, ShowAction, ShowState, Source, Timeline};
 use deckcraft_model::text::Hyperlink;
@@ -28,6 +29,12 @@ pub struct Show {
     tex: Option<(Key, TextureHandle)>,
     next_tex: Option<(usize, TextureHandle)>,
     blank: Option<Color32>,
+    /// See All Slides covers the show until a slide is chosen.
+    pub grid: bool,
+    /// The next click on the slide zooms in there.
+    pub zoom_arm: bool,
+    zoom: Option<Zoom>,
+    thumbs: Vec<(usize, TextureHandle)>,
     pen: bool,
     strokes: Vec<Vec<Pos2>>,
     goto: String,
@@ -88,6 +95,10 @@ impl Show {
             tex: None,
             next_tex: None,
             blank: None,
+            grid: false,
+            zoom_arm: false,
+            zoom: None,
+            thumbs: vec![],
             pen: false,
             strokes: vec![],
             goto: String::new(),
@@ -125,6 +136,8 @@ impl Show {
                 self.step_end = now;
             }
             ShowAction::Slide(i) => {
+                self.zoom = None;
+                self.zoom_arm = false;
                 if self.rehearse {
                     self.timings.push((self.timeline.as_ref().map(|t| t.0).unwrap_or(i), now - self.slide_start));
                 }
@@ -276,10 +289,25 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         show.last_move = now;
     }
     let mut actions: Vec<ShowAction> = vec![];
+    let full = ui.max_rect();
+    let avail = if show.reading { Rect::from_min_max(full.min, pos2(full.max.x, full.max.y - 34.0)) } else { full };
+    let srect = fit(avail, &doc);
+    let pointer = ctx.input(|i| i.pointer.interact_pos());
     for (k, m) in keys {
         use egui::Key::*;
+        if matches!(k, Escape | Minus) {
+            if !show.back_out() {
+                keep = false;
+            }
+            continue;
+        }
+        if show.grid {
+            if k == G && plain(m) {
+                show.grid = false;
+            }
+            continue;
+        }
         match k {
-            Escape | Minus => keep = false,
             ArrowRight | ArrowDown | Space | PageDown | N => {
                 if show.ended {
                     keep = false;
@@ -305,16 +333,19 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             A if m.command => show.pen = false,
             Home => actions.push(show.state.goto(&doc, 0)),
             End => actions.push(show.state.goto(&doc, doc.slides.len().saturating_sub(1))),
-            B | Period => show.blank = if show.blank == Some(Color32::BLACK) { None } else { Some(Color32::BLACK) },
-            W | Comma => show.blank = if show.blank == Some(Color32::WHITE) { None } else { Some(Color32::WHITE) },
+            B | Period => toggle_blank(&mut show, Color32::BLACK),
+            W | Comma => toggle_blank(&mut show, Color32::WHITE),
             E => show.strokes.clear(),
+            G if plain(m) => show.grid = true,
+            Z if plain(m) => show.zoom_key(),
             Num0 | Num1 | Num2 | Num3 | Num4 | Num5 | Num6 | Num7 | Num8 | Num9 => {
                 show.goto.push_str(k.name());
             }
             _ => {}
         }
     }
-    let on_slide = !show.pen && !show.ended && show.blank.is_none() && !show.reading_bar_hit(&ctx);
+    let on_slide =
+        !show.grid && !show.pen && !show.ended && show.blank.is_none() && show.zoom.is_none() && !show.zoom_arm && !show.reading_bar_hit(&ctx);
     let gif_click = if clicked && on_slide { gif_hit(&ctx, ui, &show, &doc, app) } else { None };
     let media_click = if clicked && on_slide && gif_click.is_none() { media_hit(&ctx, ui, &show, &doc) } else { None };
     let link = if on_slide && gif_click.is_none() && media_click.is_none() { link_hit(&ctx, ui, &mut show, &doc) } else { None };
@@ -330,6 +361,27 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             LinkJump::Exit => keep = false,
             LinkJump::None => {}
         }
+    } else if show.grid && clicked {
+        let aspect = slide_aspect(&doc);
+        if let Some(p) = pointer
+            && let Some(n) = see_all_hit(full, grid_indices(doc.slides.len()).len(), aspect, p)
+            && let Some(&i) = grid_indices(doc.slides.len()).get(n)
+        {
+            show.grid = false;
+            show.blank = None;
+            show.zoom = None;
+            show.zoom_arm = false;
+            actions.push(show.state.goto(&doc, i));
+        }
+    } else if clicked && show.zoom_arm && !show.reading_bar_hit(&ctx) {
+        if let Some(p) = pointer
+            && let Some((nx, ny)) = norm_on_slide(srect, unit_uv(), p)
+        {
+            show.zoom = Some(Zoom::at(nx, ny));
+            show.zoom_arm = false;
+        }
+    } else if clicked && show.zoom.is_some() && !show.pen && !show.reading_bar_hit(&ctx) {
+        show.dismiss_zoom();
     } else if clicked && !show.pen && !show.reading_bar_hit(&ctx) {
         if show.ended {
             keep = false;
@@ -339,7 +391,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             actions.push(show.state.next(&doc));
         }
     }
-    if secondary && !show.ended {
+    if secondary && !show.ended && !show.grid && show.zoom.is_none() && !show.zoom_arm {
         actions.push(show.state.prev(&doc));
     }
     // Apply input first: a step started by this click must restart the clock before it is read.
@@ -364,7 +416,8 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         let next_auto = show.timeline(&doc).step_is_auto(cur_step);
         let n_steps = show.timeline(&doc).steps();
         let step_due = cur_step < n_steps && ((show.autoplay && idle > 0.3) || next_auto);
-        if step_due || (!show.rehearse && show.state.auto_advance_due(&doc, idle) && !show.ended) {
+        let holding = show.grid || show.zoom.is_some() || show.zoom_arm;
+        if !holding && (step_due || (!show.rehearse && show.state.auto_advance_due(&doc, idle) && !show.ended)) {
             actions.push(show.state.next(&doc));
         } else if show.preview_only && cur_step >= n_steps && idle > 0.8 {
             keep = false;
@@ -377,11 +430,8 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     }
     show_media(app, &mut show, &doc);
     // Draw.
-    let full = ui.max_rect();
     let painter = ui.painter_at(full);
     painter.rect_filled(full, CornerRadius::ZERO, Color32::BLACK);
-    let avail = if show.reading { Rect::from_min_max(full.min, pos2(full.max.x, full.max.y - 34.0)) } else { full };
-    let srect = fit(avail, &doc);
     let ppp = ctx.pixels_per_point();
     let size = ((srect.width() * ppp).round().max(1.0) as u32, (srect.height() * ppp).round().max(1.0) as u32);
     if show.ended {
@@ -534,10 +584,11 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         if !drew {
             show.trans = None;
             if let Some(tex) = &tex {
-                painter.image(tex.id(), srect, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
+                painter.image(tex.id(), srect, show.zoom_uv(), Color32::WHITE);
             }
             // Playing video: the current frame in its box, or full screen.
-            let k = srect.width() / doc.slide_size.width.max(1.0) as f32;
+            let (sw, sh) = (doc.slide_size.width as f32, doc.slide_size.height as f32);
+            let uv = show.zoom_uv();
             for (id, x, clip) in &media {
                 if !clip.video || hidden.contains(id) {
                     continue;
@@ -545,12 +596,15 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
                 let r = if clip.full_screen && app.media.is_playing(*id) {
                     full
                 } else {
-                    Rect::from_min_size(pos2(srect.min.x + x.x as f32 * k, srect.min.y + x.y as f32 * k), vec2(x.w as f32 * k, x.h as f32 * k))
+                    slide_box(srect, uv, sw, sh, x.x as f32, x.y as f32, x.w as f32, x.h as f32)
                 };
                 crate::media::paint_frame(&painter, &app.media, *id, r);
             }
             // Play/pause on the animated GIF under the pointer.
-            if let Some(p) = ctx.input(|i| i.pointer.hover_pos()).filter(|_| !show.pen && now - show.last_move < 2.5) {
+            if let Some(p) =
+                ctx.input(|i| i.pointer.hover_pos()).filter(|_| !show.pen && !show.zoom_arm && show.zoom.is_none() && now - show.last_move < 2.5)
+            {
+                let k = srect.width() / sw.max(1.0);
                 for g in &gifs {
                     let r = on_screen(srect, k, &g.rect);
                     if r.contains(p) {
@@ -573,12 +627,17 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         if resp.drag_started() {
             show.strokes.push(vec![]);
         }
+        let uv = show.zoom_uv();
         if resp.dragged()
-            && let (Some(p), Some(s)) = (resp.interact_pointer_pos(), show.strokes.last_mut())
+            && let Some(p) = resp.interact_pointer_pos()
+            && let Some((nx, ny)) = norm_on_slide(srect, uv, p)
+            && let Some(s) = show.strokes.last_mut()
         {
-            s.push(pos2((p.x - srect.min.x) / srect.width(), (p.y - srect.min.y) / srect.height()));
+            s.push(pos2(nx, ny));
         }
         ctx.set_cursor_icon(egui::CursorIcon::Crosshair);
+    } else if show.zoom_arm || show.grid {
+        ctx.set_cursor_icon(egui::CursorIcon::Crosshair);
     } else if link.is_some() {
         ctx.set_cursor_icon(egui::CursorIcon::PointingHand);
     } else if now - show.last_move > 2.5 && !show.reading {
@@ -586,10 +645,20 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         ctx.request_repaint_after(std::time::Duration::from_millis(500));
     }
     let pen_col = theme::to_color32(doc.show.pen_color);
+    let uv = show.zoom_uv();
     for s in &show.strokes {
-        let pts: Vec<Pos2> = s.iter().map(|q| pos2(srect.min.x + q.x * srect.width(), srect.min.y + q.y * srect.height())).collect();
+        let pts: Vec<Pos2> = s.iter().map(|q| slide_to_screen(srect, uv, q.x, q.y)).collect();
         painter.add(egui::Shape::line(pts, Stroke::new(3.0, pen_col)));
     }
+    if show.zoom_arm && !show.grid {
+        painter.text(
+            pos2(full.center().x, full.min.y + 36.0),
+            Align2::CENTER_CENTER,
+            "Click the slide to zoom in. Esc cancels.",
+            theme::font(16.0),
+            Color32::WHITE,
+        );
+    }
     // Reading view bar / on-screen controls.
     if show.reading {
         let bar = Rect::from_min_max(pos2(full.min.x, full.max.y - 34.0), full.max);
@@ -619,8 +688,8 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             let a = show.state.prev(&doc);
             show.apply(a, &doc, now);
         }
-    } else if now - show.last_move < 2.5 {
-        let bar = Rect::from_min_size(pos2(full.min.x + 20.0, full.max.y - 50.0), vec2(250.0, 34.0));
+    } else if !show.grid && (now - show.last_move < 2.5 || show.zoom_arm) {
+        let bar = tool_bar_rect(full);
         painter.rect_filled(bar, CornerRadius::same(17), Color32::from_black_alpha(140));
         let mut child =
             ui.new_child(egui::UiBuilder::new().max_rect(bar.shrink2(vec2(10.0, 4.0))).layout(egui::Layout::left_to_right(egui::Align::Center)));
@@ -638,14 +707,26 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         if b(&mut child, if show.pen { "✏ on" } else { "✏" }).clicked() {
             show.pen = !show.pen;
         }
-        if b(&mut child, "⬛").clicked() {
-            show.blank = Some(Color32::BLACK);
+        if b(&mut child, "Black").clicked() {
+            toggle_blank(&mut show, Color32::BLACK);
+        }
+        if b(&mut child, "White").clicked() {
+            toggle_blank(&mut show, Color32::WHITE);
+        }
+        if b(&mut child, "All").clicked() {
+            show.grid = !show.grid;
+        }
+        if b(&mut child, show.zoom_label()).clicked() {
+            show.zoom_key();
         }
         if b(&mut child, "End").clicked() {
             keep = false;
         }
         ctx.request_repaint_after(std::time::Duration::from_millis(300));
     }
+    if show.grid && !show.ended {
+        paint_grid(&painter, &ctx, &mut show, &doc, full);
+    }
     if show.rehearse {
         let t = now - show.slide_start;
         let total = now - show.show_start;
@@ -759,15 +840,308 @@ fn gif_hit(ctx: &egui::Context, ui: &Ui, show: &Show, doc: &Presentation, app: &
 }
 
 impl Show {
+    fn zoom_uv(&self) -> Rect {
+        self.zoom.map(Zoom::uv).unwrap_or_else(unit_uv)
+    }
+
+    fn zoom_label(&self) -> &'static str {
+        if self.zoom.is_some() {
+            "Zoom on"
+        } else if self.zoom_arm {
+            "Zoom…"
+        } else {
+            "Zoom"
+        }
+    }
+
+    /// Z, or the Zoom button: arm a click-to-zoom, or leave a zoom that is already on.
+    fn zoom_key(&mut self) {
+        if self.zoom.is_some() || self.zoom_arm {
+            self.dismiss_zoom();
+        } else {
+            self.zoom_arm = true;
+            self.pen = false;
+        }
+    }
+
+    /// Esc closes See All Slides, then a zoom, and only then leaves the show.
+    fn back_out(&mut self) -> bool {
+        if self.grid {
+            self.grid = false;
+            true
+        } else {
+            self.dismiss_zoom()
+        }
+    }
+
+    /// Esc backs out of a zoom before it leaves the show. True when it did.
+    fn dismiss_zoom(&mut self) -> bool {
+        if self.zoom.is_some() || self.zoom_arm {
+            self.zoom = None;
+            self.zoom_arm = false;
+            true
+        } else {
+            false
+        }
+    }
+
+    pub fn blank_name(&self) -> Option<&'static str> {
+        match self.blank {
+            Some(c) if c == Color32::BLACK => Some("black"),
+            Some(c) if c == Color32::WHITE => Some("white"),
+            Some(_) => Some("blank"),
+            None => None,
+        }
+    }
+
+    pub fn zoom_view(&self) -> Option<(f32, f32, f32)> {
+        self.zoom.map(|z| (z.nx, z.ny, z.scale))
+    }
+
+    pub fn showing_value(&self, n_slides: usize, aspect: f32, full: Rect) -> serde_json::Value {
+        let mut v = json!({
+            "slide": self.state.slide,
+            "step": self.state.step,
+            "ended": self.ended,
+            "grid": self.grid,
+            "zoomArm": self.zoom_arm,
+            "blank": self.blank_name(),
+            "zoom": self.zoom_view().map(|(x, y, scale)| json!({"x": x, "y": y, "scale": scale})),
+        });
+        if self.grid {
+            let slides = grid_indices(n_slides);
+            let cells = see_all_cells(full, slides.len(), aspect);
+            v["cells"] =
+                serde_json::Value::Array(slides.iter().zip(cells).map(|(i, r)| json!({"slide": i, "x": r.center().x, "y": r.center().y})).collect());
+        }
+        v
+    }
+
     fn reading_bar_hit(&self, ctx: &egui::Context) -> bool {
         // Clicks on the on-screen controls must not also advance.
         ctx.input(|i| i.pointer.interact_pos()).is_some_and(|p| {
             let r = ctx.content_rect();
-            (self.reading && p.y > r.max.y - 34.0) || (!self.reading && p.y > r.max.y - 56.0 && p.x < r.min.x + 280.0)
+            (self.reading && p.y > r.max.y - 34.0) || (!self.reading && tool_bar_rect(r).expand(8.0).contains(p))
         })
     }
 }
 
+const ZOOM_SCALE: f32 = 2.0;
+const GRID_CAP: usize = 48;
+const TOOL_BAR_W: f32 = 520.0;
+
+#[derive(Clone, Copy)]
+struct Zoom {
+    nx: f32,
+    ny: f32,
+    scale: f32,
+}
+
+impl Zoom {
+    fn at(nx: f32, ny: f32) -> Self {
+        Zoom { nx: finite_unit(nx), ny: finite_unit(ny), scale: ZOOM_SCALE }
+    }
+
+    fn uv(self) -> Rect {
+        zoom_uv(self.nx, self.ny, self.scale)
+    }
+}
+
+fn finite_unit(n: f32) -> f32 {
+    if n.is_finite() { n.clamp(0.0, 1.0) } else { 0.5 }
+}
+
+fn plain(m: egui::Modifiers) -> bool {
+    !m.command && !m.ctrl && !m.alt && !m.shift
+}
+
+fn unit_uv() -> Rect {
+    Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0))
+}
+
+fn slide_aspect(doc: &Presentation) -> f32 {
+    let a = doc.slide_size.width as f32 / doc.slide_size.height.max(1.0) as f32;
+    if a.is_finite() && a > 0.05 { a } else { 16.0 / 9.0 }
+}
+
+/// The part of the slide a zoom shows, in 0–1 texture space. The window stays on the slide.
+fn zoom_uv(nx: f32, ny: f32, scale: f32) -> Rect {
+    let scale = if scale.is_finite() && scale > 1.0 { scale } else { ZOOM_SCALE };
+    let w = 1.0 / scale;
+    if w >= 1.0 {
+        return unit_uv();
+    }
+    let x = (nx - w * 0.5).clamp(0.0, 1.0 - w);
+    let y = (ny - w * 0.5).clamp(0.0, 1.0 - w);
+    Rect::from_min_size(pos2(x, y), vec2(w, w))
+}
+
+fn zoom_frame(slide: Rect, uv: Rect) -> Rect {
+    Rect::from_min_size(
+        pos2(slide.min.x + uv.min.x * slide.width(), slide.min.y + uv.min.y * slide.height()),
+        vec2(uv.width() * slide.width(), uv.height() * slide.height()),
+    )
+}
+
+fn toggle_blank(show: &mut Show, color: Color32) {
+    show.blank = if show.blank == Some(color) { None } else { Some(color) };
+}
+
+fn tool_bar_rect(full: Rect) -> Rect {
+    let w = TOOL_BAR_W.min((full.width() - 32.0).max(32.0));
+    Rect::from_min_size(pos2(full.min.x + 16.0, full.max.y - 50.0), vec2(w, 34.0))
+}
+
+fn grid_indices(n: usize) -> Vec<usize> {
+    (0..n.min(GRID_CAP)).collect()
+}
+
+/// Thumbnail rectangles for `n` slides inside `full`, largest 16:9-style thumbs that fit.
+fn see_all_cells(full: Rect, n: usize, aspect: f32) -> Vec<Rect> {
+    if n == 0 || full.width() < 16.0 || full.height() < 16.0 {
+        return vec![];
+    }
+    let aspect = if aspect.is_finite() && aspect > 0.05 { aspect } else { 16.0 / 9.0 };
+    let margin = 28.0;
+    let gap = 16.0;
+    let label_h = 22.0;
+    let inner = full.shrink(margin);
+    let inner = Rect::from_min_max(pos2(inner.min.x, inner.min.y + 36.0), inner.max);
+    if inner.width() < 8.0 || inner.height() < 8.0 {
+        return vec![];
+    }
+    let mut best: Vec<Rect> = vec![];
+    let mut best_area = 0.0_f32;
+    for cols in 1..=n.min(8) {
+        let rows = n.div_ceil(cols);
+        let cell_w = (inner.width() - gap * (cols.saturating_sub(1) as f32)) / cols as f32;
+        let cell_h = (inner.height() - gap * (rows.saturating_sub(1) as f32)) / rows as f32;
+        if cell_w < 8.0 || cell_h < label_h + 8.0 {
+            continue;
+        }
+        let thumb_max_h = cell_h - label_h;
+        let mut tw = cell_w;
+        let mut th = tw / aspect;
+        if th > thumb_max_h {
+            th = thumb_max_h;
+            tw = th * aspect;
+        }
+        if tw < 8.0 || th < 8.0 {
+            continue;
+        }
+        let area = tw * th;
+        if area <= best_area {
+            continue;
+        }
+        best_area = area;
+        best = (0..n)
+            .map(|i| {
+                let c = i % cols;
+                let r = i / cols;
+                let ox = inner.min.x + c as f32 * (cell_w + gap) + (cell_w - tw) * 0.5;
+                let oy = inner.min.y + r as f32 * (cell_h + gap);
+                Rect::from_min_size(pos2(ox, oy), vec2(tw, th))
+            })
+            .collect();
+    }
+    best
+}
+
+fn see_all_hit(full: Rect, n: usize, aspect: f32, p: Pos2) -> Option<usize> {
+    see_all_cells(full, n, aspect).into_iter().position(|r| r.expand2(vec2(4.0, 18.0)).contains(p))
+}
+
+fn norm_on_slide(srect: Rect, uv: Rect, p: Pos2) -> Option<(f32, f32)> {
+    if srect.width() <= 1.0 || srect.height() <= 1.0 || !srect.contains(p) {
+        return None;
+    }
+    let u = (p.x - srect.min.x) / srect.width();
+    let v = (p.y - srect.min.y) / srect.height();
+    let nx = uv.min.x + u * uv.width();
+    let ny = uv.min.y + v * uv.height();
+    (nx.is_finite() && ny.is_finite()).then_some((nx.clamp(0.0, 1.0), ny.clamp(0.0, 1.0)))
+}
+
+fn slide_to_screen(srect: Rect, uv: Rect, nx: f32, ny: f32) -> Pos2 {
+    let u = (nx - uv.min.x) / uv.width().max(1e-4);
+    let v = (ny - uv.min.y) / uv.height().max(1e-4);
+    pos2(srect.min.x + u * srect.width(), srect.min.y + v * srect.height())
+}
+
+fn slide_box(srect: Rect, uv: Rect, slide_w: f32, slide_h: f32, x: f32, y: f32, w: f32, h: f32) -> Rect {
+    let a = slide_to_screen(srect, uv, x / slide_w.max(1.0), y / slide_h.max(1.0));
+    let b = slide_to_screen(srect, uv, (x + w) / slide_w.max(1.0), (y + h) / slide_h.max(1.0));
+    Rect::from_min_max(a, b)
+}
+
+fn paint_grid(painter: &egui::Painter, ctx: &egui::Context, show: &mut Show, doc: &Presentation, full: Rect) {
+    let slides = grid_indices(doc.slides.len());
+    let aspect = slide_aspect(doc);
+    let cells = see_all_cells(full, slides.len(), aspect);
+    painter.rect_filled(full, CornerRadius::ZERO, Color32::from_gray(16));
+    painter.text(pos2(full.center().x, full.min.y + 28.0), Align2::CENTER_CENTER, "All slides", theme::font(20.0), Color32::WHITE);
+    if doc.slides.len() > GRID_CAP {
+        painter.text(
+            pos2(full.center().x, full.min.y + 50.0),
+            Align2::CENTER_CENTER,
+            format!("First {GRID_CAP} slides"),
+            theme::font(13.0),
+            Color32::from_gray(180),
+        );
+    }
+    let budget = if slides.len() <= 12 { 12 } else { 4 };
+    let mut made = 0;
+    for (i, rect) in slides.iter().copied().zip(cells) {
+        painter.rect_filled(rect, CornerRadius::same(4), Color32::from_gray(32));
+        let tex = match show.thumbs.iter().find(|(k, _)| *k == i).map(|(_, t)| t.clone()) {
+            Some(t) => Some(t),
+            None if made < budget => {
+                made += 1;
+                render_thumb(ctx, show, doc, i)
+            }
+            None => {
+                ctx.request_repaint();
+                None
+            }
+        };
+        if let Some(t) = tex {
+            painter.image(t.id(), rect, unit_uv(), Color32::WHITE);
+        }
+        let current = i == show.state.slide;
+        painter.rect_stroke(
+            rect,
+            CornerRadius::same(4),
+            Stroke::new(if current { 3.0 } else { 1.0 }, if current { Color32::WHITE } else { Color32::from_gray(70) }),
+            egui::StrokeKind::Inside,
+        );
+        let hidden = doc.slides.get(i).is_some_and(|s| s.hidden);
+        let label = if hidden { format!("{}  Hidden", i + 1) } else { format!("{}", i + 1) };
+        painter.text(
+            pos2(rect.center().x, rect.max.y + 12.0),
+            Align2::CENTER_CENTER,
+            label,
+            theme::font(13.0),
+            if current { Color32::WHITE } else { Color32::from_gray(180) },
+        );
+    }
+}
+
+fn render_thumb(ctx: &egui::Context, show: &mut Show, doc: &Presentation, i: usize) -> Option<TextureHandle> {
+    if show.thumbs.len() >= GRID_CAP {
+        return None;
+    }
+    let w = 320.0_f64;
+    let h = (w * doc.slide_size.height / doc.slide_size.width.max(1.0)).round().max(1.0);
+    let img = deckcraft_render::render_slide(
+        doc,
+        i,
+        &RenderOpts { scale: w / doc.slide_size.width.max(1.0), size: Some((w as u32, h as u32)), ..Default::default() },
+    );
+    let tex = ctx.load_texture(format!("show-grid-{i}"), crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR);
+    show.thumbs.push((i, tex.clone()));
+    Some(tex)
+}
+
 fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, now: f64, keep: &mut bool) {
     let cur = show.state.slide;
     let next = deckcraft_anim::show_order(doc).into_iter().find(|i| *i > cur);
@@ -820,7 +1194,21 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
                         }
                     });
                 });
-                ui.add_space(10.0);
+                ui.horizontal(|ui| {
+                    if ui.button(if show.blank == Some(Color32::BLACK) { "Black on" } else { "Black" }).clicked() {
+                        toggle_blank(show, Color32::BLACK);
+                    }
+                    if ui.button(if show.blank == Some(Color32::WHITE) { "White on" } else { "White" }).clicked() {
+                        toggle_blank(show, Color32::WHITE);
+                    }
+                    if ui.button(if show.grid { "All slides on" } else { "All slides" }).clicked() {
+                        show.grid = !show.grid;
+                    }
+                    if ui.button(show.zoom_label()).clicked() {
+                        show.zoom_key();
+                    }
+                });
+                ui.add_space(8.0);
                 let avail = ui.available_rect_before_wrap();
                 let left = Rect::from_min_max(avail.min, pos2(avail.min.x + avail.width() * 0.62, avail.max.y));
                 let right = Rect::from_min_max(pos2(left.max.x + 16.0, avail.min.y), avail.max);
@@ -829,6 +1217,24 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
                 if let Some(t) = &cur_tex {
                     ui.painter().image(t.id(), cr, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
                 }
+                if let Some(z) = show.zoom {
+                    let mark = zoom_frame(cr, z.uv());
+                    ui.painter().rect_stroke(mark, CornerRadius::ZERO, Stroke::new(2.0, Color32::WHITE), egui::StrokeKind::Inside);
+                }
+                if show.zoom_arm {
+                    let hit = ui.interact(cr, ui.id().with("presenter_zoom"), Sense::click());
+                    if hit.clicked()
+                        && let Some(p) = hit.interact_pointer_pos()
+                        && cr.width() > 1.0
+                        && cr.height() > 1.0
+                    {
+                        show.zoom = Some(Zoom::at((p.x - cr.min.x) / cr.width(), (p.y - cr.min.y) / cr.height()));
+                        show.zoom_arm = false;
+                    }
+                }
+                if let Some(c) = show.blank {
+                    ui.painter().rect_filled(cr, CornerRadius::ZERO, c);
+                }
                 let nr = Rect::from_min_size(
                     right.min + vec2(0.0, 22.0),
                     vec2(right.width(), right.width() * (doc.slide_size.height / doc.slide_size.width.max(1.0)) as f32),
@@ -885,4 +1291,61 @@ mod tests {
         assert_eq!(tr.from, Some(0));
         assert!(show.tex.is_none(), "the new slide gets a texture of its own instead of overwriting the old one");
     }
+
+    #[test]
+    fn zoom_stays_on_the_slide_and_the_grid_hits_a_thumbnail() {
+        let uv = zoom_uv(0.5, 0.5, 2.0);
+        assert!((uv.min.x - 0.25).abs() < 1e-4 && (uv.min.y - 0.25).abs() < 1e-4);
+        assert!((uv.width() - 0.5).abs() < 1e-4);
+        let corner = zoom_uv(0.0, 0.0, 2.0);
+        assert_eq!(corner.min, pos2(0.0, 0.0));
+        assert!(corner.max.x <= 1.0 && corner.max.y <= 1.0);
+        let full = Rect::from_min_size(Pos2::ZERO, vec2(1728.0, 1084.0));
+        let cells = see_all_cells(full, 7, 16.0 / 9.0);
+        assert_eq!(cells.len(), 7);
+        for (i, a) in cells.iter().enumerate() {
+            assert!(full.contains_rect(*a), "cell {i} leaves the window");
+            for b in cells.iter().skip(i + 1) {
+                let overlap = a.intersect(*b);
+                assert!(overlap.width() < 1.0 || overlap.height() < 1.0, "thumbnails overlap {a:?} {b:?}");
+            }
+        }
+        let hit = see_all_hit(full, 7, 16.0 / 9.0, cells[3].center());
+        assert_eq!(hit, Some(3));
+        assert_eq!(see_all_hit(full, 7, 16.0 / 9.0, pos2(2.0, 2.0)), None);
+        let srect = Rect::from_min_size(pos2(10.0, 20.0), vec2(200.0, 100.0));
+        assert_eq!(norm_on_slide(srect, unit_uv(), pos2(110.0, 70.0)), Some((0.5, 0.5)));
+        let zoomed = zoom_uv(0.5, 0.5, 2.0);
+        let back = norm_on_slide(srect, zoomed, pos2(110.0, 70.0)).expect("on the slide");
+        assert!((back.0 - 0.5).abs() < 1e-3 && (back.1 - 0.5).abs() < 1e-3);
+    }
+
+    #[test]
+    fn escape_leaves_the_grid_then_the_zoom_and_blank_toggles() {
+        let mut s = deckcraft_engine::Session::with_new();
+        s.execute("slide.new", &json!({})).unwrap();
+        let doc = s.active().unwrap().doc.clone();
+        let mut show = Show::new(&doc, 0, false, true);
+        show.grid = true;
+        show.zoom = Some(Zoom::at(0.2, 0.3));
+        assert!(show.back_out());
+        assert!(!show.grid);
+        assert!(show.zoom.is_some(), "closing the grid leaves the zoom");
+        assert!(show.back_out());
+        assert!(show.zoom.is_none());
+        assert!(!show.back_out());
+        show.zoom_key();
+        assert!(show.zoom_arm);
+        show.zoom_key();
+        assert!(!show.zoom_arm);
+        toggle_blank(&mut show, Color32::BLACK);
+        assert_eq!(show.blank_name(), Some("black"));
+        toggle_blank(&mut show, Color32::WHITE);
+        assert_eq!(show.blank_name(), Some("white"));
+        toggle_blank(&mut show, Color32::WHITE);
+        assert_eq!(show.blank_name(), None);
+        show.zoom = Some(Zoom::at(0.4, 0.6));
+        assert!(show.apply(ShowAction::Slide(1), &doc, 1.0));
+        assert!(show.zoom.is_none(), "a new slide is shown whole");
+    }
 }
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 07741fde..11115a67 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -15,10 +15,10 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `engine.execute` / `ui.menu.invoke` / `command` | `{command, params}` | Run any command (see `engine.commands`; `deckcraft-cli describe ID` documents one) |
 | `engine.commands` | — | Every command: id, label, menu path, shortcut, params doc, enabled / disabled reason |
 | `document.inspect` | — | Slides, sections, layouts, shapes, selection |
-| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state, documents, perf (fps, render ms) |
+| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state (`grid`, `zoomArm`, `zoom`, `blank`; `cells` while See All Slides is open), documents, perf (fps, render ms) |
 | `ui.tool.select` | `{tool, preset?}` | `select`, `text`, `shape` + preset, any preset name, `curve`, `freeform`, `scribble`, `pen`, `highlighter`, `eraser` |
 | `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
-| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show) |
+| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show: G is See All Slides, Z arms zoom, Esc closes those before it leaves the show) |
 | `ui.ime` | `{preedit, active?: [start, end]}` / `{commit}` | An input method's composition through egui, as a real one arrives: shown in place on the slide or in a focused field; `{"preedit": ""}` cancels |
 | `ui.move` / `ui.click` / `ui.drag` | screen points | Real egui pointer input — reaches every widget, menu and pane |
 | `ui.set` | `{tab?, view?, pane?, notes?, zoom?, brightness?, ruler?, gridlines?, guides?, …}` | UI state (returns the full state) |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..7cba729a 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (show: See All Slides and zoom; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -17,7 +17,7 @@ points and lead the beta plan.
 |---|---|---|---|
 | Build a deck from scratch (theme, layouts, titles and bullets, shapes, pictures from file), save, close and reopen it | yes | Commands for all of it; `.deckcraft` and `.pptx` round-trip tests (`crates/pptx/tests/roundtrip.rs`, `crates/format`); AutoRecover. Close discards edits without asking (#60, PR #75); image *paste* fails on Windows/Linux (#53), though insert-from-file works | 1–3 |
 | Open a colleague's `.pptx`, edit it, save it back as `.pptx` that PowerPoint opens | partial (not blocking) | The reader is lenient and keeps unknown objects. Files open in PowerPoint without repair (checked 2026-10-06). But only generated decks have been tested; text inside EMF/WMF pictures is missing; comment threads, media options and rewind are lost (#70, #74, #77) | 31–55 |
-| Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window. Presenter view isn't placed on the second display automatically (drag it there) | 3–5 |
+| Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window, See All Slides and zoom. Presenter view isn't placed on the second display automatically (drag it there) | 3–5 |
 | Add business content: tables, charts with their data, simple diagrams | partial (not blocking) | Tables with styles, merge/split, all D or P. Charts insert with the common types and edit data in the Chart Data dialog (P0 partial); SmartArt is basic (pre-drawn shapes) | 12–20 |
 | Share the deck: PDF of slides, notes or handouts; images | yes | `file.export` PDF with text layer, links, bookmarks, handouts 1–9; PNG/JPEG. Artwork is raster in the PDF; no direct print (print the PDF) | 10–16 |
 | Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft`; threads are flattened on `.pptx` save (#70); spelling is a small built-in list | 4–8 |
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Present workflow notes See All Slides and zoom |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index fd981595..8eb7327c 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (See All Slides and zoom during the show; black and white from the presenter window; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -22,8 +22,8 @@ ready** (estimated), **10–16 h** to parity.
 | Hyperlinks and action settings followed (slides, web, mail, End Show, Last Viewed) | yes | yes | Only `http(s)` and `mailto` open outside the show, by design (`safe_url`) |
 | Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable |
 | Animated GIFs play; pause from their corner button | yes | yes (#39) | |
-| See All Slides grid during the show | yes | no | |
-| Zoom into part of a slide during the show | yes | no | |
+| See All Slides grid during the show | yes | yes: G, or All on the show bar and in presenter view; click a thumbnail, Esc closes the grid | Hidden slides are labelled; the first 48 slides are shown |
+| Zoom into part of a slide during the show | yes | yes: Z, then click the slide (or the presenter slide); 2×, Esc or another click leaves it | The presenter keeps the whole slide and draws a frame on the zoomed part |
 | Pen and highlighter ink | yes | pen only (Cmd+P pen, Cmd+A arrow, E erases all ink) | No highlighter, per-stroke eraser, ink colours, or keep/discard annotations prompt |
 | Laser pointer | yes | **no** | 1–2 h |
 | Subtitles and live captions | yes (cloud speech) | no | AI dimension |
@@ -42,8 +42,8 @@ ready** (estimated), **10–16 h** to parity.
 | Notes font size, scrolling | yes | scrolling only | |
 | Placed on the presenter's display automatically, show on the projector | yes | **no**: opens wherever the OS puts it | Beta blocker, 3–5 h |
 | Swap displays | yes | no | |
-| Pen, laser, black screen, zoom from presenter view | yes | keys only | |
-| See all slides from presenter view | yes | no | |
+| Pen, laser, black screen, zoom from presenter view | yes | Black, White and Zoom buttons; the audience zoom is framed on the presenter slide | Pen and the laser pointer are still keys only; there is no laser yet |
+| See all slides from presenter view | yes | yes: All slides opens the grid on the show | |
 | Rehearse with Coach (Speaker Coach) | yes (cloud) | no | AI dimension |
 
 ## Rehearse and record
@@ -65,12 +65,12 @@ Reading View in a window with navigation: present (checklist row done).
 |---|---|
 | Presenter view on the right display, swap displays, pause/reset timer, clock, notes size | 3–5 |
 | Laser pointer, highlighter, eraser, keep-annotations prompt | 2–4 |
-| See All Slides and zoom during the show | 2–3 |
 | Record slide show with narration (no camera) | 5–8 |
-| **Total** | **~12–20** (the slide-show row of the feature table carries 10–16 h; recording overlaps the Media row) |
+| **Total** | **~10–17** (the slide-show row of the feature table carries 10–16 h; recording overlaps the Media row) |
 
 ## Revision history
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | See All Slides (G) and click-to-zoom (Z) during the show. Presenter view opens that grid and sets black, white and zoom. Checklist breadth stays 66% |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..afa04498 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show lists See All Slides and zoom; breadth stays 79%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -227,9 +227,9 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Transitions and animations:** 48 transitions including Morph (objects, words, characters,
   geometry outlines), 64 animation effects (entrance, emphasis, exit, motion paths, media),
   triggers, by-paragraph builds, Animation Painter, on a shared timeline engine.
-- **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide, pen,
-  presenter window, rehearse timings, custom shows, Set Up Show, Reading View; links and shape
-  actions followed on click.
+- **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide, See All
+  Slides, click-to-zoom, pen, presenter window (black, white, zoom and the slide grid), rehearse
+  timings, custom shows, Set Up Show, Reading View; links and shape actions followed on click.
 - **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom;
   grayscale.
 - **Review:** comments with replies and resolve, accessibility checker, a basic spelling list.
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Slide show evidence includes See All Slides and zoom. Breadth stays 79% |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |

From 77de43266ee64a6ce4e2e459cf23d79e17695dc6 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:56:19 +0300
Subject: [PATCH 255/376] Text: shrink on overflow stops at once when even the
 smallest scale overflows

---
 crates/text/src/lib.rs   | 21 +++++++++++++++++++--
 crates/text/src/tests.rs | 16 ++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index d6bc66bf..7a6f8842 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -1534,6 +1534,12 @@ fn tab_advance(x: f64, stops: &[Tab], default_tab: f64, seg: (f64, f64)) -> f64
     (next - x).max(1.0)
 }
 
+#[cfg(test)]
+thread_local! {
+    /// How many times `layout_scaled` ran on this thread (tests count autofit's passes).
+    pub(crate) static LAYOUT_PASSES: std::cell::Cell<usize> = const { std::cell::Cell::new(0) };
+}
+
 /// Lay out a shape's text body.
 pub fn layout(ctx: &Ctx, shape: &Shape, body: &TextBody, opts: &Opts) -> TextLayout {
     let bp = resolve::body(ctx, shape);
@@ -1542,9 +1548,16 @@ pub fn layout(ctx: &Ctx, shape: &Shape, body: &TextBody, opts: &Opts) -> TextLay
     if let (AutoFit::Shrink { .. }, false) = (autofit, opts.no_shrink)
         && l.overflow
     {
+        // Text that overflows even at the smallest scale gets that scale: every larger one
+        // overflows too, so searching would only lay it out a dozen more times (seconds for a
+        // body of tens of thousands of paragraphs, on every redraw of the slide).
+        let smallest = layout_scaled(ctx, shape, body, &bp, opts, 0.1, 0.2);
+        if smallest.overflow {
+            return smallest;
+        }
         // Binary search the largest scale that fits (steps like 90%, 80%… with line reduction).
         let (mut lo, mut hi) = (0.1_f64, 1.0_f64);
-        let mut best = None;
+        let mut best = Some(smallest);
         for _ in 0..12 {
             let mid = (lo + hi) / 2.0;
             let red: f64 = ((1.0 - mid) * 0.8_f64).min(0.2);
@@ -1556,13 +1569,17 @@ pub fn layout(ctx: &Ctx, shape: &Shape, body: &TextBody, opts: &Opts) -> TextLay
                 best = Some(t);
             }
         }
-        l = best.unwrap_or_else(|| layout_scaled(ctx, shape, body, &bp, opts, 0.1, 0.2));
+        if let Some(b) = best {
+            l = b;
+        }
     }
     l
 }
 
 #[allow(clippy::too_many_arguments)]
 fn layout_scaled(ctx: &Ctx, shape: &Shape, body: &TextBody, bp: &BodyProps, opts: &Opts, scale: f64, reduce: f64) -> TextLayout {
+    #[cfg(test)]
+    LAYOUT_PASSES.with(|n| n.set(n.get() + 1));
     let r = opts.rect;
     let vert = bp.vert.unwrap_or(TextDir::Horizontal);
     // East Asian vertical text: CJK stands upright in text turned a quarter turn; stacked text
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index 1e2be177..6ffec19c 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -181,6 +181,22 @@ fn shrink_on_overflow() {
     assert!(!l.overflow || l.font_scale <= 0.11);
 }
 
+#[test]
+fn shrink_gives_up_at_once_when_even_the_smallest_scale_overflows() {
+    // Found by fuzzing: a tiny box with 20,000 paragraphs and shrink on overflow took 15 s to
+    // open, laying out the whole body 13 times in a search that could never fit.
+    let text = (0..400).map(|i| format!("Line number {i}")).collect::<Vec<_>>().join("\n");
+    let (p, sh) = setup(&text, 100.0, 20.0);
+    crate::LAYOUT_PASSES.with(|n| n.set(0));
+    let l = lay(&p, &sh, 100.0, 20.0);
+    assert!(l.overflow && l.font_scale <= 0.11, "scale {}", l.font_scale);
+    assert!(crate::LAYOUT_PASSES.with(|n| n.get()) <= 2, "{} passes", crate::LAYOUT_PASSES.with(|n| n.get()));
+    // Text that fits somewhere in the range still gets the search.
+    let (p, sh) = setup(&(0..12).map(|i| format!("Line number {i}")).collect::<Vec<_>>().join("\n"), 600.0, 200.0);
+    let l = lay(&p, &sh, 600.0, 200.0);
+    assert!(l.font_scale > 0.11 && l.font_scale < 1.0 && !l.overflow, "scale {} overflow {}", l.font_scale, l.overflow);
+}
+
 #[test]
 fn caret_and_hit_roundtrip() {
     let (p, sh) = setup("Hello world", 600.0, 100.0);

From 05eb4c611b737a01318f3bb998d87de66ed5bac2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 03:57:32 +0300
Subject: [PATCH 256/376] UI: keep every texture within the GPU's max texture
 side

Slide show, transition and morph frames, thumbnails, master-view canvas, master/layout
thumbnails, Design Ideas previews, presenter-view preview and video frames all upload through
textures::upload/replace, which shrinks a picture past max_texture_side (egui panicked on one).
Render sizes are fitted to the limit first, so a big screen, extreme DPI or a 1:56 slide
doesn't render a picture the GPU can't hold. The master canvas is cropped like the slide canvas.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/ui-egui/src/canvas.rs              |  8 +-
 crates/ui-egui/src/lib.rs                 |  2 +
 crates/ui-egui/src/media.rs               |  4 +-
 crates/ui-egui/src/panes.rs               |  8 +-
 crates/ui-egui/src/ribbon.rs              |  3 +-
 crates/ui-egui/src/show.rs                | 32 ++++----
 crates/ui-egui/src/texture_limit_tests.rs | 53 +++++++++++++
 crates/ui-egui/src/textures.rs            | 95 +++++++++++++++++++++--
 crates/ui-egui/src/thumbs.rs              | 12 +--
 9 files changed, 184 insertions(+), 33 deletions(-)
 create mode 100644 crates/ui-egui/src/texture_limit_tests.rs

diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index c7290b35..14cbe491 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -314,14 +314,18 @@ fn master_tex(
     visible: deckcraft_render::Region,
 ) -> Option<(egui::TextureHandle, deckcraft_render::Region)> {
     let scale = px.0 as f64 / doc.slide_size.width.max(1.0);
-    let region = deckcraft_render::pasteboard_region(px, scale, deckcraft_render::layout_extent(doc, master, layout), visible);
+    let region = crate::textures::fit_texture(
+        deckcraft_render::pasteboard_region(px, scale, deckcraft_render::layout_extent(doc, master, layout), visible),
+        visible,
+        crate::textures::max_side(ctx),
+    );
     let img = deckcraft_render::render_layout(
         doc,
         master,
         layout,
         &deckcraft_render::RenderOpts { scale, edit: true, offset: region.offset(), size: Some(region.size()), ..Default::default() },
     );
-    Some((ctx.load_texture("master-canvas", crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR), region))
+    Some((crate::textures::upload(ctx, "master-canvas", crate::textures::to_color_image(&img, false)), region))
 }
 
 fn ruler(p: &egui::Painter, avail: Rect, slide: Rect, scale: f32, t: &Tokens) {
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index b40daf7b..5e53cb40 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1165,6 +1165,8 @@ fn js_now() -> f64 {
 
 #[cfg(test)]
 mod ime_tests;
+#[cfg(test)]
+mod texture_limit_tests;
 
 #[cfg(test)]
 mod tests {
diff --git a/crates/ui-egui/src/media.rs b/crates/ui-egui/src/media.rs
index f887c2b2..fd018aea 100644
--- a/crates/ui-egui/src/media.rs
+++ b/crates/ui-egui/src/media.rs
@@ -209,8 +209,8 @@ impl MediaHost {
             {
                 let img = egui::ColorImage::from_rgba_unmultiplied([f.width as usize, f.height as usize], &f.rgba);
                 match v.tex.as_mut() {
-                    Some(t) => t.set(img, egui::TextureOptions::LINEAR),
-                    None => v.tex = Some(ctx.load_texture(format!("media-{id}"), img, egui::TextureOptions::LINEAR)),
+                    Some(t) => crate::textures::replace(ctx, t, img),
+                    None => v.tex = Some(crate::textures::upload(ctx, format!("media-{id}"), img)),
                 }
                 v.frame = Some(f);
             }
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..f8aa0525 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -613,14 +613,16 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
             m.theme = th.clone();
         }
         let ppp = ui.ctx().pixels_per_point();
-        let px = (w * ppp) as u32;
-        let h = (px as f64 * d.slide_size.height / d.slide_size.width.max(1.0)) as u32;
+        let (px, h) = crate::textures::fit_size(
+            (((w * ppp) as u32).max(1), (((w * ppp) as f64) * d.slide_size.height / d.slide_size.width.max(1.0)).clamp(1.0, 1e9) as u32),
+            crate::textures::max_side(ui.ctx()),
+        );
         let img = deckcraft_render::render_slide(
             &d,
             idx,
             &deckcraft_render::RenderOpts { scale: px as f64 / d.slide_size.width.max(1.0), size: Some((px, h)), ..Default::default() },
         );
-        let tex = ui.ctx().load_texture(format!("idea-{}", th.name), crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR);
+        let tex = crate::textures::upload(ui.ctx(), format!("idea-{}", th.name), crate::textures::to_color_image(&img, false));
         let (r, resp) = ui.allocate_exact_size(vec2(w, w * h as f32 / px.max(1) as f32), Sense::click());
         ui.painter().image(tex.id(), r, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
         ui.painter().rect_stroke(
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..f2e06424 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -339,8 +339,7 @@ fn layout_menu(app: &mut SlideApp, ui: &mut Ui, cmd: &str) {
                             ..Default::default()
                         },
                     );
-                    let tex =
-                        ui.ctx().load_texture(format!("layout-{li}"), crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR);
+                    let tex = crate::textures::upload(ui.ctx(), format!("layout-{li}"), crate::textures::to_color_image(&img, false));
                     ui.painter().image(tex.id(), rect, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
                 }
                 let t = Tokens::get(ui.ctx());
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..a0dfcc30 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -233,7 +233,7 @@ fn part_textures(ctx: &egui::Context, doc: &Presentation, from: Option<usize>, t
     let opts = RenderOpts { scale: size.0 as f64 / doc.slide_size.width.max(1.0), size: Some(size), threads, ..Default::default() };
     let tex = |i: usize, part: SlidePart, name: &str| {
         let img = deckcraft_render::render_slide_part(doc, i, part, &opts);
-        ctx.load_texture(name, crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR)
+        crate::textures::upload(ctx, name, crate::textures::to_color_image(&img, false))
     };
     [
         from.map(|i| tex(i, SlidePart::Backdrop, "trans-old-back")),
@@ -383,7 +383,12 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     let avail = if show.reading { Rect::from_min_max(full.min, pos2(full.max.x, full.max.y - 34.0)) } else { full };
     let srect = fit(avail, &doc);
     let ppp = ctx.pixels_per_point();
-    let size = ((srect.width() * ppp).round().max(1.0) as u32, (srect.height() * ppp).round().max(1.0) as u32);
+    // A huge screen or DPI mustn't ask for a picture the GPU can't hold: render at most its limit
+    // (drawn stretched to the screen).
+    let size = crate::textures::fit_size(
+        ((srect.width() * ppp).round().clamp(1.0, u32::MAX as f32) as u32, (srect.height() * ppp).round().clamp(1.0, u32::MAX as f32) as u32),
+        crate::textures::max_side(&ctx),
+    );
     if show.ended {
         painter.text(
             pos2(full.center().x, full.min.y + 40.0),
@@ -439,10 +444,10 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             let ci = crate::textures::to_color_image(&img, false);
             let tex = match show.tex.take() {
                 Some((_, mut h)) => {
-                    h.set(ci, egui::TextureOptions::LINEAR);
+                    crate::textures::replace(&ctx, &mut h, ci);
                     h
                 }
-                None => ctx.load_texture("show", ci, egui::TextureOptions::LINEAR),
+                None => crate::textures::upload(&ctx, "show", ci),
             };
             show.tex = Some((key, tex.clone()));
             Some(tex)
@@ -484,10 +489,10 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             let ci = crate::textures::to_color_image(&img, false);
             let frame = match tr.morph.take() {
                 Some(mut h) => {
-                    h.set(ci, egui::TextureOptions::LINEAR);
+                    crate::textures::replace(&ctx, &mut h, ci);
                     h
                 }
-                None => ctx.load_texture("morph", ci, egui::TextureOptions::LINEAR),
+                None => crate::textures::upload(&ctx, "morph", ci),
             };
             painter.image(frame.id(), srect, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
             tr.morph = Some(frame);
@@ -775,16 +780,17 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
     if let Some(n) = next
         && show.next_tex.as_ref().is_none_or(|(k, _)| *k != n)
     {
+        // A very tall slide shape would otherwise ask for a picture taller than the GPU's limit.
+        let next_size = crate::textures::fit_size(
+            (480, (480.0 * doc.slide_size.height / doc.slide_size.width.max(1.0)).clamp(1.0, 1e9) as u32),
+            crate::textures::max_side(ctx),
+        );
         let img = deckcraft_render::render_slide(
             doc,
             n,
-            &RenderOpts {
-                scale: 480.0 / doc.slide_size.width.max(1.0),
-                size: Some((480, (480.0 * doc.slide_size.height / doc.slide_size.width.max(1.0)) as u32)),
-                ..Default::default()
-            },
+            &RenderOpts { scale: next_size.0 as f64 / doc.slide_size.width.max(1.0), size: Some(next_size), ..Default::default() },
         );
-        show.next_tex = Some((n, ctx.load_texture("presenter-next", crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR)));
+        show.next_tex = Some((n, crate::textures::upload(ctx, "presenter-next", crate::textures::to_color_image(&img, false))));
     }
     let next_tex = show.next_tex.as_ref().filter(|(k, _)| Some(*k) == next).map(|(_, t)| t.clone());
     let notes = doc.slides.get(cur).map(|s| s.notes_text()).unwrap_or_default();
@@ -876,7 +882,7 @@ mod tests {
         s.execute("transition.set", &json!({"kind": "fade", "index": 1})).unwrap();
         let doc = s.active().unwrap().doc.clone();
         let ctx = egui::Context::default();
-        let red = ctx.load_texture("show", egui::ColorImage::filled([1, 1], Color32::RED), egui::TextureOptions::LINEAR);
+        let red = crate::textures::upload(&ctx, "show", egui::ColorImage::filled([1, 1], Color32::RED));
         let mut show = Show::new(&doc, 0, false, false);
         show.tex = Some((Key { slide: 0, step: 0, size: (1, 1), doc: 0, hidden: vec![], gif: 0 }, red.clone()));
         assert!(show.apply(ShowAction::Slide(1), &doc, 0.0));
diff --git a/crates/ui-egui/src/texture_limit_tests.rs b/crates/ui-egui/src/texture_limit_tests.rs
new file mode 100644
index 00000000..bf5c648d
--- /dev/null
+++ b/crates/ui-egui/src/texture_limit_tests.rs
@@ -0,0 +1,53 @@
+//! Textures stay within the renderer's `max_texture_side` (2048 in the test harness, as on many
+//! GPUs and software fallbacks): bigger ones panicked in egui. Slide show on a big screen,
+//! thumbnails, master views and presenter view of a very tall slide.
+#![allow(clippy::unwrap_used, clippy::expect_used)]
+
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+use deckcraft_engine::Session;
+
+fn harness(session: Session, size: egui::Vec2) -> egui_kittest::Harness<'static, SlideApp> {
+    egui_kittest::Harness::builder().with_size(size).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SlideApp::new(session, Services::default()),
+    )
+}
+
+/// The tallest slide allowed (1 × 56): its thumbnails and presenter-view preview are tens of
+/// thousands of pixels high at their usual widths.
+fn tall_deck() -> Session {
+    let mut s = Session::with_new();
+    s.execute("design.slideSize", &json!({"w": 72, "h": 4032})).unwrap();
+    s.execute("slide.new", &json!({})).unwrap();
+    s
+}
+
+#[test]
+fn a_slide_show_on_a_screen_wider_than_the_texture_limit() {
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({})).unwrap();
+    let mut h = harness(s, egui::vec2(2600.0, 1500.0));
+    h.run_steps(2);
+    h.state_mut().run("show.start", json!({})).unwrap();
+    h.run_steps(4);
+    assert!(h.state().show.is_some());
+}
+
+#[test]
+fn a_very_tall_slide_in_the_editor_views_and_presenter_view() {
+    let mut h = harness(tall_deck(), egui::vec2(1280.0, 800.0));
+    h.run_steps(3);
+    for (cmd, p) in [("view.sorter", json!({})), ("view.normal", json!({})), ("view.slideMaster", json!({})), ("view.closeMaster", json!({}))] {
+        let _ = h.state_mut().run(cmd, p);
+        h.run_steps(3);
+    }
+    h.state_mut().run("show.presenter", json!({"on": true})).unwrap();
+    h.state_mut().run("show.start", json!({"from": 0})).unwrap();
+    h.run_steps(4);
+    assert!(h.state().show.is_some());
+}
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index b28f227f..df19e232 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -67,6 +67,66 @@ pub fn to_color_image(img: &Image, grayscale: bool) -> ColorImage {
     ColorImage::new([w, h], px)
 }
 
+/// The largest texture side the renderer (GPU or software fallback) takes; egui panics on
+/// a bigger texture.
+pub fn max_side(ctx: &egui::Context) -> u32 {
+    ctx.input(|i| i.max_texture_side).clamp(1, u32::MAX as usize) as u32
+}
+
+/// `(w, h)` scaled down, keeping its shape, so neither side exceeds `max` (and none is 0).
+/// Render sizes go through this so a huge display, DPI or slide shape doesn't render a
+/// picture the GPU can't hold.
+pub fn fit_size((w, h): (u32, u32), max: u32) -> (u32, u32) {
+    let (w, h, max) = (w.max(1), h.max(1), max.max(1));
+    let big = w.max(h);
+    if big <= max {
+        return (w, h);
+    }
+    let k = max as f64 / big as f64;
+    (((w as f64 * k).floor() as u32).clamp(1, max), ((h as f64 * k).floor() as u32).clamp(1, max))
+}
+
+/// `img` shrunk by whole-pixel box averaging until both sides fit `max`.
+pub fn shrink_to(img: ColorImage, max: u32) -> ColorImage {
+    let [w, h] = img.size;
+    let max = max.max(1) as usize;
+    if w <= max && h <= max {
+        return img;
+    }
+    let f = w.max(h).div_ceil(max);
+    let (nw, nh) = (w.div_ceil(f).max(1), h.div_ceil(f).max(1));
+    let mut px = Vec::with_capacity(nw * nh);
+    for y in 0..nh {
+        for x in 0..nw {
+            let mut acc = [0u32; 4];
+            let mut n = 0u32;
+            for sy in y * f..((y + 1) * f).min(h) {
+                for sx in x * f..((x + 1) * f).min(w) {
+                    if let Some(c) = img.pixels.get(sy * w + sx) {
+                        for (a, v) in acc.iter_mut().zip(c.to_array()) {
+                            *a += v as u32;
+                        }
+                        n += 1;
+                    }
+                }
+            }
+            let n = n.max(1);
+            px.push(egui::Color32::from_rgba_premultiplied((acc[0] / n) as u8, (acc[1] / n) as u8, (acc[2] / n) as u8, (acc[3] / n) as u8));
+        }
+    }
+    ColorImage::new([nw, nh], px)
+}
+
+/// Upload a texture, shrunk to the renderer's limit if need be.
+pub fn upload(ctx: &egui::Context, name: impl Into<String>, img: ColorImage) -> TextureHandle {
+    ctx.load_texture(name, shrink_to(img, max_side(ctx)), TextureOptions::LINEAR)
+}
+
+/// Replace a texture's picture, shrunk to the renderer's limit if need be.
+pub fn replace(ctx: &egui::Context, tex: &mut TextureHandle, img: ColorImage) {
+    tex.set(shrink_to(img, max_side(ctx)), TextureOptions::LINEAR);
+}
+
 fn master_of(p: &Presentation, slide: &Slide) -> Option<Arc<Master>> {
     p.masters.iter().find(|m| m.layout(slide.layout).is_some()).cloned()
 }
@@ -117,7 +177,7 @@ impl Textures {
             _ => estimate,
         };
         // The GPU's (or software fallback's) texture limit: a larger canvas texture panics in egui.
-        let max_side = ctx.input(|i| i.max_texture_side).max(1) as u32;
+        let max_side = max_side(ctx);
         let want = fit_texture(deckcraft_render::pasteboard_region(size, scale, reach, visible), visible, max_side);
         let key = Key {
             slide: Arc::as_ptr(&slide) as usize,
@@ -156,10 +216,10 @@ impl Textures {
         let ci = to_color_image(&img, grayscale);
         let tex = match self.canvas.take() {
             Some(mut e) => {
-                e.tex.set(ci, TextureOptions::LINEAR);
+                replace(ctx, &mut e.tex, ci);
                 e.tex
             }
-            None => ctx.load_texture("slide-canvas", ci, TextureOptions::LINEAR),
+            None => upload(ctx, "slide-canvas", ci),
         };
         self.canvas = Some(Entry { key, tex: tex.clone(), region, _slide: slide, _master: master, stamp: 0 });
         Some((tex, region))
@@ -200,9 +260,10 @@ impl Textures {
             return self.thumbs.get(&key.slide).map(|e| e.tex.clone());
         }
         *budget -= 1;
-        let scale = width_px as f64 / p.slide_size.width.max(1.0);
-        let img = deckcraft_render::render_slide(p, index, &RenderOpts { scale, size: Some((width_px, h)), threads: 0, ..Default::default() });
-        let tex = ctx.load_texture(format!("thumb-{index}"), to_color_image(&img, false), TextureOptions::LINEAR);
+        let (tw, th) = fit_size((width_px, h), max_side(ctx));
+        let scale = tw as f64 / p.slide_size.width.max(1.0);
+        let img = deckcraft_render::render_slide(p, index, &RenderOpts { scale, size: Some((tw, th)), threads: 0, ..Default::default() });
+        let tex = upload(ctx, format!("thumb-{index}"), to_color_image(&img, false));
         // Drop the old entry for this slide address; entries for slides that no longer exist age out.
         let region = key.want;
         self.thumbs.insert(key.slide, Entry { key, tex: tex.clone(), region, _slide: slide, _master: master, stamp: clock });
@@ -245,4 +306,26 @@ mod fit_tests {
         assert_eq!((f.x, f.w), (-100 + 5000 - 2048, 2048));
         assert_eq!(fit_texture(r, r, 8192), r);
     }
+
+    #[test]
+    fn render_sizes_and_pictures_shrink_to_the_limit_keeping_their_shape() {
+        assert_eq!(fit_size((195, 10920), 2048), (36, 2048));
+        assert_eq!(fit_size((3000, 1500), 2048), (2048, 1024));
+        assert_eq!(fit_size((800, 600), 2048), (800, 600));
+        assert_eq!(fit_size((0, 0), 0), (1, 1));
+        // A 5000 × 3 picture: half red, half blue, averaged down to 1667 × 1.
+        let img = ColorImage::new(
+            [5000, 3],
+            (0..3)
+                .flat_map(|y| (0..5000).map(move |x| (x, y)))
+                .map(|(x, _)| if x < 2500 { egui::Color32::RED } else { egui::Color32::BLUE })
+                .collect(),
+        );
+        let small = shrink_to(img, 2048);
+        assert_eq!(small.size, [1667, 1]);
+        assert_eq!(small.pixels[0], egui::Color32::RED);
+        assert_eq!(small.pixels[1666], egui::Color32::BLUE);
+        let ok = ColorImage::filled([10, 10], egui::Color32::WHITE);
+        assert_eq!(shrink_to(ok.clone(), 2048).size, ok.size);
+    }
 }
diff --git a/crates/ui-egui/src/thumbs.rs b/crates/ui-egui/src/thumbs.rs
index ebdc81d0..07ac2dae 100644
--- a/crates/ui-egui/src/thumbs.rs
+++ b/crates/ui-egui/src/thumbs.rs
@@ -270,20 +270,22 @@ fn master_list(app: &mut SlideApp, ui: &mut Ui) {
                 let (row, resp) = ui.allocate_exact_size(vec2(width, th + 12.0), Sense::click());
                 let img = Rect::from_min_size(pos2(row.min.x + indent, row.min.y + 4.0), vec2(tw, th));
                 let ppp = ui.ctx().pixels_per_point();
-                let px = ((tw * ppp) as u32).max(1);
+                let px = crate::textures::fit_size(
+                    (((tw * ppp) as u32).max(1), ((tw * ppp) as f64 * doc.slide_size.height / doc.slide_size.width.max(1.0)).clamp(1.0, 1e9) as u32),
+                    crate::textures::max_side(ui.ctx()),
+                );
                 let pic = deckcraft_render::render_layout(
                     &doc,
                     mi,
                     li,
                     &deckcraft_render::RenderOpts {
-                        scale: px as f64 / doc.slide_size.width.max(1.0),
+                        scale: px.0 as f64 / doc.slide_size.width.max(1.0),
                         edit: true,
-                        size: Some((px, (px as f64 * doc.slide_size.height / doc.slide_size.width.max(1.0)) as u32)),
+                        size: Some(px),
                         ..Default::default()
                     },
                 );
-                let tex =
-                    ui.ctx().load_texture(format!("ml-{mi}-{li:?}"), crate::textures::to_color_image(&pic, false), egui::TextureOptions::LINEAR);
+                let tex = crate::textures::upload(ui.ctx(), format!("ml-{mi}-{li:?}"), crate::textures::to_color_image(&pic, false));
                 ui.painter().image(tex.id(), img, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
                 let selected = match (target, li) {
                     (Target::Master { master }, None) => master == mi,

From 0b66323765ad08556ba7454628b057fe02e01f5b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:03:35 +0300
Subject: [PATCH 257/376] PPTX: shape text without an anchor sits at the top
 (or the theme's spDef anchor); write ctr for the model's middle default

---
 crates/pptx/src/read/mod.rs     | 48 +++++++++++++++++++++
 crates/pptx/src/write/shapes.rs | 10 ++++-
 crates/pptx/tests/anchor.rs     | 74 +++++++++++++++++++++++++++++++++
 3 files changed, 131 insertions(+), 1 deletion(-)
 create mode 100644 crates/pptx/tests/anchor.rs

diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index 057614eb..cc8a6f93 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -398,6 +398,7 @@ pub fn import(bytes: &[u8]) -> Result<Presentation, PptxError> {
     }
 
     inherit_placeholder_geometry(&mut p);
+    default_text_anchor(&mut p);
     p.header_footer = header_footer(&p);
     p.media = std::mem::take(&mut imp.media);
     p.next_id = imp.next;
@@ -434,6 +435,53 @@ pub fn color_map(cm: &El) -> Vec<(String, String)> {
 /// geometry of the layout or master placeholder they inherit from, as PowerPoint draws them: a
 /// layout's picture placeholder cut into a shape keeps that shape on the slide. Anything left
 /// is a rectangle.
+/// The anchor the theme's shape defaults (`a:objectDefaults/a:spDef/a:bodyPr`) give new shapes
+/// text, if any.
+fn theme_shape_anchor(t: &deckcraft_model::Theme) -> Option<deckcraft_model::text::Anchor> {
+    let raw = t.raw_extra.as_deref()?;
+    let sp = &raw[raw.find("spDef")?..];
+    let sp = &sp[..sp.find("/a:spDef").or_else(|| sp.find("txDef")).unwrap_or(sp.len())];
+    let b = &sp[sp.find("bodyPr")?..];
+    let b = &b[..b.find('>').unwrap_or(b.len())];
+    let v = &b[b.find("anchor=\"")? + 8..];
+    deckcraft_model::text::Anchor::from_xml(&v[..v.find('"')?])
+}
+
+/// A shape's text without an anchor of its own sits at the top, as the standard has it (or where
+/// the theme's shape defaults put it). The model's own default for shapes is the middle, so a
+/// top or bottom anchor is made explicit here and a middle one left unset (placeholders and text
+/// boxes keep inheriting).
+fn default_text_anchor(p: &mut Presentation) {
+    fn fix(shapes: &mut [deckcraft_model::Shape], a: deckcraft_model::text::Anchor) {
+        walk_shapes_mut(shapes, &mut |s| {
+            if s.ph.is_none()
+                && !s.text_box
+                && !matches!(s.kind, deckcraft_model::ShapeKind::Table(_))
+                && let Some(t) = &mut s.text
+            {
+                // Middle is the model's own default for shapes, so it is kept as unset.
+                let got = t.body.anchor.unwrap_or(a);
+                t.body.anchor = (got != deckcraft_model::text::Anchor::Middle).then_some(got);
+            }
+        });
+    }
+    let top = deckcraft_model::text::Anchor::Top;
+    let anchors: Vec<_> = p.masters.iter().map(|m| (m.id, theme_shape_anchor(&m.theme).unwrap_or(top))).collect();
+    for m in &mut p.masters {
+        let a = anchors.iter().find(|(id, _)| *id == m.id).map(|x| x.1).unwrap_or(top);
+        let m = Arc::make_mut(m);
+        fix(&mut m.shapes, a);
+        for l in &mut m.layouts {
+            fix(&mut l.shapes, a);
+        }
+    }
+    let per_slide: Vec<_> =
+        p.slides.iter().map(|s| p.master_for(s).and_then(|(m, _)| anchors.iter().find(|(id, _)| *id == m.id)).map(|x| x.1).unwrap_or(top)).collect();
+    for (s, a) in p.slides.iter_mut().zip(per_slide) {
+        fix(&mut Arc::make_mut(s).shapes, a);
+    }
+}
+
 fn inherit_placeholder_geometry(p: &mut Presentation) {
     let unset = |g: &Geom| matches!(g, Geom::Custom { paths } if paths.is_empty());
     // Masters first, then layouts (from their masters), then slides (from layouts and masters).
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 8b2ea35d..aca29ac8 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -464,7 +464,15 @@ fn sp(w: &mut W, x: &mut Exp, o: &mut Out, id: u32, s: &Shape, math: bool) {
         style(w, st);
     }
     if let Some(tb) = &s.text {
-        dml::text_body(w, x, o, "p:txBody", tb, math);
+        // A shape's text without its own anchor sits in the middle in the model; a file without
+        // one would put it at the top, so say so.
+        if s.ph.is_none() && !s.text_box && tb.body.anchor.is_none() {
+            let mut tb = tb.clone();
+            tb.body.anchor = Some(deckcraft_model::text::Anchor::Middle);
+            dml::text_body(w, x, o, "p:txBody", &tb, math);
+        } else {
+            dml::text_body(w, x, o, "p:txBody", tb, math);
+        }
     }
     w.close("p:sp");
 }
diff --git a/crates/pptx/tests/anchor.rs b/crates/pptx/tests/anchor.rs
new file mode 100644
index 00000000..72af2436
--- /dev/null
+++ b/crates/pptx/tests/anchor.rs
@@ -0,0 +1,74 @@
+//! Text anchoring of shapes without an `anchor` of their own: the model centres a shape's text,
+//! a file without one puts it at the top (or where the theme's shape defaults say).
+
+use std::io::{Cursor, Read, Write};
+
+use deckcraft_model::text::Anchor;
+use deckcraft_model::{Presentation, ShapeKind};
+use zip::write::SimpleFileOptions;
+
+fn sample() -> Presentation {
+    let mut s = deckcraft_engine::Session::new();
+    deckcraft_engine::sample::open_sample(&mut s).expect("sample");
+    s.doc().expect("doc").doc.as_ref().clone()
+}
+
+/// Every part of `bytes` with `edit` applied to the XML ones.
+fn rewrite(bytes: &[u8], edit: impl Fn(&str, String) -> String) -> Vec<u8> {
+    let mut src = zip::ZipArchive::new(Cursor::new(bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    for i in 0..src.len() {
+        let mut f = src.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        let mut data = Vec::new();
+        f.read_to_end(&mut data).expect("read");
+        if name.ends_with(".xml") {
+            data = edit(&name, String::from_utf8(data).expect("utf8")).into_bytes();
+        }
+        out.start_file(name, SimpleFileOptions::default()).expect("start");
+        out.write_all(&data).expect("write");
+    }
+    out.finish().expect("finish").into_inner()
+}
+
+/// Anchors of the shapes with text that aren't placeholders, text boxes or tables.
+fn anchors(p: &Presentation) -> Vec<Option<Anchor>> {
+    p.slides
+        .iter()
+        .flat_map(|s| s.shapes.iter())
+        .filter(|s| s.ph.is_none() && !s.text_box && !matches!(s.kind, ShapeKind::Table(_)))
+        .filter_map(|s| s.text.as_ref().map(|t| t.body.anchor))
+        .collect()
+}
+
+#[test]
+fn shapes_keep_their_middle_anchor_and_files_without_one_anchor_at_the_top() {
+    let p = sample();
+    assert!(anchors(&p).contains(&None), "the sample has shapes with the model's default anchor");
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+
+    // Written explicitly, so PowerPoint (which reads a missing anchor as top) centres them too.
+    let back = deckcraft_pptx::import(&bytes).expect("import");
+    let a = anchors(&back);
+    assert_eq!(a, anchors(&p), "the middle anchor survives (as the model's default)");
+
+    // The same file without the anchors: their text sits at the top.
+    let bare = rewrite(&bytes, |n, x| if n.starts_with("ppt/slides/slide") { x.replace(r#" anchor="ctr""#, "") } else { x });
+    let a = anchors(&deckcraft_pptx::import(&bare).expect("import"));
+    assert!(a.iter().all(|x| *x == Some(Anchor::Top)), "{a:?}");
+
+    // ...unless the theme's shape defaults centre them, as Office's themes do.
+    let themed = rewrite(&bare, |n, x| {
+        if n.starts_with("ppt/theme/") {
+            x.replace(
+                "<a:objectDefaults/>",
+                r#"<a:objectDefaults><a:spDef><a:spPr/><a:bodyPr rtlCol="0" anchor="ctr"/><a:lstStyle/></a:spDef></a:objectDefaults>"#,
+            )
+        } else {
+            x
+        }
+    });
+    let a = anchors(&deckcraft_pptx::import(&themed).expect("import"));
+    assert!(a.iter().all(|x| x.is_none() || *x == Some(Anchor::Middle)), "{a:?}");
+    assert!(a.iter().filter(|x| x.is_none()).count() >= 3, "{a:?}");
+}

From d31ed52bbe12f84cd3029bea3815ed6808d70ca0 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:04:09 +0300
Subject: [PATCH 258/376] Show: presenter view keeps a portrait Next slide
 inside its column

The Next preview took the column's full width and the slide's aspect for its height, so a
portrait slide (up to 1:56) drew a white slab many times the window's height over the notes,
which were pushed below the window. It is now fitted into the top 60% of the column; 16:9
slides keep the full width as before.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/ui-egui/src/show.rs                | 30 ++++++++++++++++++++---
 crates/ui-egui/src/texture_limit_tests.rs | 16 ++++++++++++
 2 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index a0dfcc30..01188544 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -208,6 +208,14 @@ fn fit(avail: Rect, doc: &Presentation) -> Rect {
 
 /// A transition layer as an egui mesh: [`deckcraft_anim::layer_mesh`]'s triangles (perspective
 /// cards subdivided so their pictures stay straight) with per-vertex opacity.
+/// Where presenter view's "Next" preview goes: the column's width below its label, kept inside
+/// the top 60% of the column. A portrait slide used to get the full width and a height many
+/// times the window (a white slab over the notes and past the window edge).
+fn next_rect(right: Rect, doc: &Presentation) -> Rect {
+    let area = Rect::from_min_max(right.min + vec2(0.0, 22.0), pos2(right.max.x, right.min.y + 22.0 + (right.height() - 22.0).max(0.0) * 0.6));
+    Rect::from_min_size(area.min, fit(area, doc).size())
+}
+
 fn quad_mesh(tex: Option<egui::TextureId>, rect: Rect, l: &Layer, color: Color32) -> Mesh {
     let mut m = match tex {
         Some(id) => Mesh::with_texture(id),
@@ -835,10 +843,7 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
                 if let Some(t) = &cur_tex {
                     ui.painter().image(t.id(), cr, Rect::from_min_max(pos2(0.0, 0.0), pos2(1.0, 1.0)), Color32::WHITE);
                 }
-                let nr = Rect::from_min_size(
-                    right.min + vec2(0.0, 22.0),
-                    vec2(right.width(), right.width() * (doc.slide_size.height / doc.slide_size.width.max(1.0)) as f32),
-                );
+                let nr = next_rect(right, doc);
                 ui.painter().text(right.min, Align2::LEFT_TOP, "Next", theme::font(13.0), Color32::from_gray(170));
                 match &next_tex {
                     Some(t) => {
@@ -891,4 +896,21 @@ mod tests {
         assert_eq!(tr.from, Some(0));
         assert!(show.tex.is_none(), "the new slide gets a texture of its own instead of overwriting the old one");
     }
+
+    #[test]
+    fn the_next_preview_fits_its_column_whatever_the_slide_shape() {
+        let right = Rect::from_min_size(pos2(700.0, 100.0), vec2(400.0, 600.0));
+        let mut s = deckcraft_engine::Session::with_new();
+        for (w, h) in [(72, 4032), (4032, 72), (960, 540)] {
+            s.execute("design.slideSize", &json!({"w": w, "h": h})).unwrap();
+            let doc = s.active().unwrap().doc.clone();
+            let r = next_rect(right, &doc);
+            assert!(right.contains_rect(r), "{w}x{h}: {r:?}");
+            let aspect = r.height() / r.width();
+            assert!((aspect - h as f32 / w as f32).abs() / (h as f32 / w as f32) < 0.01, "{w}x{h}: {r:?}");
+        }
+        // 16:9 still takes the column's full width.
+        let doc = s.active().unwrap().doc.clone();
+        assert_eq!(next_rect(right, &doc).width(), 400.0);
+    }
 }
diff --git a/crates/ui-egui/src/texture_limit_tests.rs b/crates/ui-egui/src/texture_limit_tests.rs
index bf5c648d..69dbf523 100644
--- a/crates/ui-egui/src/texture_limit_tests.rs
+++ b/crates/ui-egui/src/texture_limit_tests.rs
@@ -51,3 +51,19 @@ fn a_very_tall_slide_in_the_editor_views_and_presenter_view() {
     h.run_steps(4);
     assert!(h.state().show.is_some());
 }
+
+/// Presenter view of a portrait slide: the "Next" preview keeps the slide's shape inside its
+/// column. It took the column's full width and 56 times that in height, a white slab over the
+/// notes and past the window.
+#[test]
+fn presenter_view_keeps_a_portrait_next_slide_in_its_column() {
+    let mut h = harness(tall_deck(), egui::vec2(1280.0, 800.0));
+    h.run_steps(3);
+    h.state_mut().run("show.presenter", json!({"on": true})).unwrap();
+    h.state_mut().run("show.start", json!({"from": 0})).unwrap();
+    h.run_steps(4);
+    let img = h.render().unwrap();
+    // Right of the Next column's narrow preview, below where a landscape one would end.
+    let px = img.get_pixel(1000, 600).0;
+    assert!(px[0] < 128 && px[1] < 128 && px[2] < 128, "the Next preview spills over the column: {px:?}");
+}

From f5fd32489221582bf364f1bca93c45b89abb80a2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:06:50 +0300
Subject: [PATCH 259/376] Show: presenter timer pause, reset and notes size

---
 ROADMAP.md                    |   2 +
 crates/ui-egui/src/control.rs |   3 +-
 crates/ui-egui/src/show.rs    | 181 +++++++++++++++++++++++++++++++---
 docs/control-protocol.md      |   4 +-
 docs/roadmap.md               |   7 +-
 docs/slideshow-parity.md      |  15 +--
 docs/target-app-parity.md     |   8 +-
 7 files changed, 190 insertions(+), 30 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 22d31cf0..ec5a6ed2 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Presenter view pauses and resets its timer (T, R) and changes notes size (A-/A+, brackets). The clock shows local time. Second-display placement stays with #433. Breadth stays 79% |
 | 2026-10-14 | See All Slides and zoom during a show: a thumbnail grid (G, or All), click to jump, and click-to-zoom at 2× (Z). Presenter view has Black, White, All slides and Zoom. Breadth stays 79% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
@@ -151,6 +152,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: presenter timer pause/reset, clock and notes size. Breadth stays 79% |
 | 2026-10-14 | trivial | Progress log: See All Slides and zoom during a show. Breadth stays 79% |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
diff --git a/crates/ui-egui/src/control.rs b/crates/ui-egui/src/control.rs
index 5fa12fd2..c7e7fc4e 100644
--- a/crates/ui-egui/src/control.rs
+++ b/crates/ui-egui/src/control.rs
@@ -80,7 +80,8 @@ pub fn inspect(app: &SlideApp, ctx: &egui::Context) -> Value {
                 let h = d.doc.slide_size.height.max(1.0) as f32;
                 (d.doc.slides.len(), d.doc.slide_size.width as f32 / h)
             }).unwrap_or((0, 16.0 / 9.0));
-            s.showing_value(n, aspect, ctx.content_rect())
+            let now = ctx.input(|i| i.time);
+            s.showing_value(n, aspect, ctx.content_rect(), now)
         }),
         "documents": app.session.documents().iter().map(|d| json!({"title": d.title(), "dirty": d.is_dirty(), "path": d.path})).collect::<Vec<_>>(),
         "status": app.status.as_ref().map(|s| s.0.clone()),
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 1cca6d6b..51a84c4f 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -40,6 +40,10 @@ pub struct Show {
     goto: String,
     started: bool,
     show_start: f64,
+    /// Elapsed time in presenter view. Pausing it does not pause the show.
+    timer: PresenterTimer,
+    /// Speaker-notes size in presenter view, in points.
+    notes_px: f32,
     timings: Vec<(usize, f64)>,
     last_move: f64,
     pub ended: bool,
@@ -104,6 +108,8 @@ impl Show {
             goto: String::new(),
             started: false,
             show_start: 0.0,
+            timer: PresenterTimer::start(0.0),
+            notes_px: NOTES_DEFAULT,
             timings: vec![],
             last_move: 0.0,
             ended: false,
@@ -269,6 +275,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         show.slide_start = now;
         show.step_start = now;
         show.show_start = now;
+        show.timer = PresenterTimer::start(now);
         show.last_move = now;
         if !show.reading {
             ctx.send_viewport_cmd(egui::ViewportCommand::Fullscreen(true));
@@ -338,6 +345,10 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             E => show.strokes.clear(),
             G if plain(m) => show.grid = true,
             Z if plain(m) => show.zoom_key(),
+            T if plain(m) => show.timer.toggle(now),
+            R if plain(m) => show.timer.reset(now),
+            OpenBracket if plain(m) => show.nudge_notes(-NOTES_STEP),
+            CloseBracket if plain(m) => show.nudge_notes(NOTES_STEP),
             Num0 | Num1 | Num2 | Num3 | Num4 | Num5 | Num6 | Num7 | Num8 | Num9 => {
                 show.goto.push_str(k.name());
             }
@@ -898,7 +909,14 @@ impl Show {
         self.zoom.map(|z| (z.nx, z.ny, z.scale))
     }
 
-    pub fn showing_value(&self, n_slides: usize, aspect: f32, full: Rect) -> serde_json::Value {
+    fn nudge_notes(&mut self, delta: f32) {
+        let next = self.notes_px + delta;
+        if next.is_finite() {
+            self.notes_px = next.clamp(NOTES_MIN, NOTES_MAX);
+        }
+    }
+
+    pub fn showing_value(&self, n_slides: usize, aspect: f32, full: Rect, now: f64) -> serde_json::Value {
         let mut v = json!({
             "slide": self.state.slide,
             "step": self.state.step,
@@ -907,6 +925,9 @@ impl Show {
             "zoomArm": self.zoom_arm,
             "blank": self.blank_name(),
             "zoom": self.zoom_view().map(|(x, y, scale)| json!({"x": x, "y": y, "scale": scale})),
+            "presenterPaused": self.timer.paused(),
+            "presenterSecs": self.timer.elapsed(now),
+            "notesPx": self.notes_px,
         });
         if self.grid {
             let slides = grid_indices(n_slides);
@@ -929,6 +950,74 @@ impl Show {
 const ZOOM_SCALE: f32 = 2.0;
 const GRID_CAP: usize = 48;
 const TOOL_BAR_W: f32 = 520.0;
+const NOTES_DEFAULT: f32 = 18.0;
+const NOTES_MIN: f32 = 12.0;
+const NOTES_MAX: f32 = 48.0;
+const NOTES_STEP: f32 = 4.0;
+
+/// Presenter-view elapsed time. Pausing freezes the number; the show keeps playing.
+#[derive(Clone, Copy)]
+struct PresenterTimer {
+    origin: f64,
+    frozen: f64,
+    paused: bool,
+}
+
+impl PresenterTimer {
+    fn start(now: f64) -> Self {
+        PresenterTimer { origin: finite_time(now), frozen: 0.0, paused: false }
+    }
+
+    fn elapsed(self, now: f64) -> f64 {
+        if self.paused {
+            return finite_secs(self.frozen);
+        }
+        let dt = now - self.origin;
+        finite_secs(self.frozen + if dt.is_finite() && dt > 0.0 { dt } else { 0.0 })
+    }
+
+    fn paused(self) -> bool {
+        self.paused
+    }
+
+    fn toggle(&mut self, now: f64) {
+        if self.paused {
+            self.origin = finite_time(now);
+            self.paused = false;
+        } else {
+            self.frozen = self.elapsed(now);
+            self.paused = true;
+        }
+    }
+
+    /// Zero the elapsed time. A paused timer stays paused at zero.
+    fn reset(&mut self, now: f64) {
+        self.frozen = 0.0;
+        self.origin = finite_time(now);
+    }
+}
+
+fn finite_time(now: f64) -> f64 {
+    if now.is_finite() { now } else { 0.0 }
+}
+
+fn finite_secs(n: f64) -> f64 {
+    if n.is_finite() && n >= 0.0 { n } else { 0.0 }
+}
+
+fn format_elapsed(secs: f64) -> String {
+    let s = finite_secs(secs) as u64;
+    let s = s.min(99 * 3600 + 59 * 60 + 59);
+    format!("{:02}:{:02}:{:02}", s / 3600, (s / 60) % 60, s % 60)
+}
+
+/// Local wall clock for presenter view. `--:--` where there is no clock (wasm).
+fn wall_clock() -> String {
+    match deckcraft_text::datetime::DateTime::now_local() {
+        Some(t) if t.hour < 24 && t.minute < 60 => format!("{:02}:{:02}", t.hour, t.minute),
+        _ => "--:--".to_string(),
+    }
+}
 
 #[derive(Clone, Copy)]
 struct Zoom {
@@ -1162,24 +1251,26 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
     }
     let next_tex = show.next_tex.as_ref().filter(|(k, _)| Some(*k) == next).map(|(_, t)| t.clone());
     let notes = doc.slides.get(cur).map(|s| s.notes_text()).unwrap_or_default();
-    let elapsed = now - show.show_start;
+    let clock = wall_clock();
+    // The presenter clock only moves when this window is drawn again.
+    ctx.request_repaint_after(std::time::Duration::from_millis(500));
     let mut actions = vec![];
     ctx.show_viewport_immediate(
         egui::ViewportId::from_hash_of("deckcraft_presenter"),
         egui::ViewportBuilder::default().with_title("Presenter View — DeckCraft").with_inner_size([1100.0, 700.0]),
         |ui, _| {
+            ui.ctx().request_repaint_after(std::time::Duration::from_millis(500));
+            let elapsed = show.timer.elapsed(now);
+            let paused = show.timer.paused();
             egui::CentralPanel::default().frame(egui::Frame::NONE.fill(Color32::from_gray(24)).inner_margin(egui::Margin::same(16))).show(ui, |ui| {
                 ui.horizontal(|ui| {
-                    ui.label(
-                        egui::RichText::new(format!(
-                            "{:02}:{:02}:{:02}",
-                            (elapsed / 3600.0) as u32,
-                            (elapsed / 60.0) as u32 % 60,
-                            elapsed as u32 % 60
-                        ))
-                        .size(22.0)
-                        .color(Color32::WHITE),
-                    );
+                    ui.label(egui::RichText::new(format_elapsed(elapsed)).size(22.0).color(if paused {
+                        Color32::from_gray(160)
+                    } else {
+                        Color32::WHITE
+                    }));
+                    ui.add_space(12.0);
+                    ui.label(egui::RichText::new(clock.clone()).size(16.0).color(Color32::from_gray(200)));
                     ui.add_space(20.0);
                     ui.label(egui::RichText::new(format!("Slide {} of {}", cur + 1, doc.slides.len())).size(16.0).color(Color32::from_gray(200)));
                     ui.with_layout(egui::Layout::right_to_left(egui::Align::Center), |ui| {
@@ -1195,6 +1286,12 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
                     });
                 });
                 ui.horizontal(|ui| {
+                    if ui.button(if paused { "Resume" } else { "Pause" }).clicked() {
+                        show.timer.toggle(now);
+                    }
+                    if ui.button("Reset").clicked() {
+                        show.timer.reset(now);
+                    }
                     if ui.button(if show.blank == Some(Color32::BLACK) { "Black on" } else { "Black" }).clicked() {
                         toggle_blank(show, Color32::BLACK);
                     }
@@ -1249,10 +1346,24 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
                         ui.painter().text(nr.center(), Align2::CENTER_CENTER, "End of slide show", theme::font(13.0), Color32::from_gray(170));
                     }
                 }
-                let notes_rect = Rect::from_min_max(pos2(right.min.x, nr.max.y + 16.0), right.max);
+                let notes_head = Rect::from_min_size(pos2(right.min.x, nr.max.y + 12.0), vec2(right.width(), 28.0));
+                let mut head = ui.new_child(egui::UiBuilder::new().max_rect(notes_head));
+                head.horizontal(|ui| {
+                    ui.label(egui::RichText::new("Notes").size(13.0).color(Color32::from_gray(170)));
+                    if ui.button("A-").clicked() {
+                        show.nudge_notes(-NOTES_STEP);
+                    }
+                    ui.label(egui::RichText::new(format!("{}", show.notes_px as i32)).size(13.0).color(Color32::from_gray(200)));
+                    if ui.button("A+").clicked() {
+                        show.nudge_notes(NOTES_STEP);
+                    }
+                });
+                let notes_rect = Rect::from_min_max(pos2(right.min.x, notes_head.max.y + 4.0), right.max);
                 let mut child = ui.new_child(egui::UiBuilder::new().max_rect(notes_rect));
                 egui::ScrollArea::vertical().show(&mut child, |ui| {
-                    ui.label(egui::RichText::new(if notes.is_empty() { "No notes." } else { &notes }).size(18.0).color(Color32::from_gray(230)));
+                    ui.label(
+                        egui::RichText::new(if notes.is_empty() { "No notes." } else { &notes }).size(show.notes_px).color(Color32::from_gray(230)),
+                    );
                 });
             });
             if ui.input(|i| i.viewport().close_requested()) {
@@ -1348,4 +1459,46 @@ mod tests {
         assert!(show.apply(ShowAction::Slide(1), &doc, 1.0));
         assert!(show.zoom.is_none(), "a new slide is shown whole");
     }
+
+    #[test]
+    fn presenter_timer_pauses_resets_and_notes_size_clamps() {
+        let mut t = PresenterTimer::start(10.0);
+        assert!((t.elapsed(12.5) - 2.5).abs() < 1e-9);
+        t.toggle(15.0);
+        assert!(t.paused());
+        assert!((t.elapsed(100.0) - 5.0).abs() < 1e-9);
+        t.reset(100.0);
+        assert!(t.paused());
+        assert_eq!(t.elapsed(200.0), 0.0);
+        t.toggle(200.0);
+        assert!(!t.paused());
+        assert!((t.elapsed(203.0) - 3.0).abs() < 1e-9);
+        t.reset(203.0);
+        assert!(!t.paused());
+        assert!((t.elapsed(204.0) - 1.0).abs() < 1e-9);
+        let bad = PresenterTimer::start(f64::NAN);
+        assert_eq!(bad.elapsed(f64::INFINITY), 0.0);
+        assert_eq!(format_elapsed(3661.4), "01:01:01");
+        assert_eq!(format_elapsed(-1.0), "00:00:00");
+        assert_eq!(format_elapsed(f64::NAN), "00:00:00");
+        let clock = wall_clock();
+        assert!(clock == "--:--" || (clock.len() == 5 && clock.as_bytes().get(2) == Some(&b':')));
+
+        let mut s = deckcraft_engine::Session::with_new();
+        s.execute("slide.new", &json!({})).unwrap();
+        let doc = s.active().unwrap().doc.clone();
+        let mut show = Show::new(&doc, 0, false, true);
+        assert_eq!(show.notes_px, NOTES_DEFAULT);
+        show.nudge_notes(NOTES_STEP);
+        assert_eq!(show.notes_px, 22.0);
+        show.nudge_notes(1000.0);
+        assert_eq!(show.notes_px, NOTES_MAX);
+        show.nudge_notes(-1000.0);
+        assert_eq!(show.notes_px, NOTES_MIN);
+        show.nudge_notes(f32::NAN);
+        assert_eq!(show.notes_px, NOTES_MIN);
+        let v = show.showing_value(1, 16.0 / 9.0, Rect::from_min_size(Pos2::ZERO, vec2(100.0, 100.0)), 0.0);
+        assert_eq!(v["presenterPaused"], json!(false));
+        assert_eq!(v["notesPx"], json!(NOTES_MIN));
+    }
 }
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 11115a67..a20fd991 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -15,10 +15,10 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `engine.execute` / `ui.menu.invoke` / `command` | `{command, params}` | Run any command (see `engine.commands`; `deckcraft-cli describe ID` documents one) |
 | `engine.commands` | — | Every command: id, label, menu path, shortcut, params doc, enabled / disabled reason |
 | `document.inspect` | — | Slides, sections, layouts, shapes, selection |
-| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state (`grid`, `zoomArm`, `zoom`, `blank`; `cells` while See All Slides is open), documents, perf (fps, render ms) |
+| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state (`grid`, `zoomArm`, `zoom`, `blank`, `presenterPaused`, `presenterSecs`, `notesPx`; `cells` while See All Slides is open), documents, perf (fps, render ms) |
 | `ui.tool.select` | `{tool, preset?}` | `select`, `text`, `shape` + preset, any preset name, `curve`, `freeform`, `scribble`, `pen`, `highlighter`, `eraser` |
 | `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
-| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show: G is See All Slides, Z arms zoom, Esc closes those before it leaves the show) |
+| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show: G is See All Slides, Z arms zoom, T pauses the presenter timer, R resets it, `[` and `]` change notes size, Esc closes the grid and zoom before it leaves the show) |
 | `ui.ime` | `{preedit, active?: [start, end]}` / `{commit}` | An input method's composition through egui, as a real one arrives: shown in place on the slide or in a focused field; `{"preedit": ""}` cancels |
 | `ui.move` / `ui.click` / `ui.drag` | screen points | Real egui pointer input — reaches every widget, menu and pane |
 | `ui.set` | `{tab?, view?, pane?, notes?, zoom?, brightness?, ruler?, gridlines?, guides?, …}` | UI state (returns the full state) |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 7cba729a..02db563b 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (show: See All Slides and zoom; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (presenter timer pause/reset, clock and notes size; previous: trivial, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -17,7 +17,7 @@ points and lead the beta plan.
 |---|---|---|---|
 | Build a deck from scratch (theme, layouts, titles and bullets, shapes, pictures from file), save, close and reopen it | yes | Commands for all of it; `.deckcraft` and `.pptx` round-trip tests (`crates/pptx/tests/roundtrip.rs`, `crates/format`); AutoRecover. Close discards edits without asking (#60, PR #75); image *paste* fails on Windows/Linux (#53), though insert-from-file works | 1–3 |
 | Open a colleague's `.pptx`, edit it, save it back as `.pptx` that PowerPoint opens | partial (not blocking) | The reader is lenient and keeps unknown objects. Files open in PowerPoint without repair (checked 2026-10-06). But only generated decks have been tested; text inside EMF/WMF pictures is missing; comment threads, media options and rewind are lost (#70, #74, #77) | 31–55 |
-| Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window, See All Slides and zoom. Presenter view isn't placed on the second display automatically (drag it there) | 3–5 |
+| Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window, See All Slides and zoom. The presenter timer pauses and resets, and notes have a size control. Presenter view isn't placed on the second display automatically (drag it there; #433) | 2–4 |
 | Add business content: tables, charts with their data, simple diagrams | partial (not blocking) | Tables with styles, merge/split, all D or P. Charts insert with the common types and edit data in the Chart Data dialog (P0 partial); SmartArt is basic (pre-drawn shapes) | 12–20 |
 | Share the deck: PDF of slides, notes or handouts; images | yes | `file.export` PDF with text layer, links, bookmarks, handouts 1–9; PNG/JPEG. Artwork is raster in the PDF; no direct print (print the PDF) | 10–16 |
 | Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft`; threads are flattened on `.pptx` save (#70); spelling is a small built-in list | 4–8 |
@@ -47,7 +47,7 @@ Beta means ~75% ready for real work and opening and saving PowerPoint's `.pptx`
 | 7 | Font weights (#69), image paste (#53), Tab in text (#78) | 6–11 | Features |
 | 8 | Charts: data grid, elements | 6–10 | Features |
 | 9 | Animation Pane timeline, preview, effect options | 5–8 | Features |
-| 10 | Presenter view on the right display, timer controls | 3–5 | Hardware, Slide show |
+| 10 | Presenter view on the right display, swap displays | 2–4 | Hardware, Slide show |
 | 11 | Native macOS menu bar, Format Shape pane depth, start screen and window chrome fixes | 13–22 | UI/UX 60 → 75% |
 | 12 | Performance baseline and the obvious fixes | 4–8 | Performance |
 | **Total** | | **~120–210** | Ready ~55% → ~75% |
@@ -109,6 +109,7 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Present workflow notes presenter timer pause/reset, clock and notes size. Display placement stays open |
 | 2026-10-14 | trivial | Present workflow notes See All Slides and zoom |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index 8eb7327c..582aac8d 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (See All Slides and zoom during the show; black and white from the presenter window; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (presenter timer pause/reset, clock and notes size; previous: minor, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -37,11 +37,11 @@ ready** (estimated), **10–16 h** to parity.
 |---|---|---|---|
 | Separate presenter window with current slide, next slide, notes | yes | yes (an egui viewport, 1100×700) | |
 | Elapsed timer | yes | yes | |
-| Pause / reset timer, clock | yes | no | |
+| Pause / reset timer, clock | yes | yes: Pause/Resume and Reset in presenter view (T pauses, R resets); the clock is local time, `--:--` where there is no clock | Pausing the timer does not pause the show, animations or rehearsal |
 | Slide counter, previous/next/end buttons | yes | yes | |
-| Notes font size, scrolling | yes | scrolling only | |
-| Placed on the presenter's display automatically, show on the projector | yes | **no**: opens wherever the OS puts it | Beta blocker, 3–5 h |
-| Swap displays | yes | no | |
+| Notes font size, scrolling | yes | yes: A- / A+ (and `[` / `]`), 12–48 pt in steps of 4, default 18; the notes scroll | |
+| Placed on the presenter's display automatically, show on the projector | yes | **no**: opens wherever the OS puts it | Open PR #433 places the show on a second display when one is attached. This change does not |
+| Swap displays | yes | no | Still open on #433 |
 | Pen, laser, black screen, zoom from presenter view | yes | Black, White and Zoom buttons; the audience zoom is framed on the presenter slide | Pen and the laser pointer are still keys only; there is no laser yet |
 | See all slides from presenter view | yes | yes: All slides opens the grid on the show | |
 | Rehearse with Coach (Speaker Coach) | yes (cloud) | no | AI dimension |
@@ -63,14 +63,15 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Work | Hours |
 |---|---|
-| Presenter view on the right display, swap displays, pause/reset timer, clock, notes size | 3–5 |
+| Presenter view on the right display and a swap-displays command | 2–4 |
 | Laser pointer, highlighter, eraser, keep-annotations prompt | 2–4 |
 | Record slide show with narration (no camera) | 5–8 |
-| **Total** | **~10–17** (the slide-show row of the feature table carries 10–16 h; recording overlaps the Media row) |
+| **Total** | **~9–16** (the slide-show row of the feature table carries 10–16 h; recording overlaps the Media row) |
 
 ## Revision history
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Presenter view pauses and resets its timer (T, R) and changes notes size (A-/A+, brackets). The clock shows local time. Second-display placement and swap stay with #433. Checklist breadth stays 66% |
 | 2026-10-14 | minor | See All Slides (G) and click-to-zoom (Z) during the show. Presenter view opens that grid and sets black, white and zoom. Checklist breadth stays 66% |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index afa04498..1a71823d 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show lists See All Slides and zoom; breadth stays 79%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show lists presenter timer pause/reset, clock and notes size; breadth stays 79%; previous: trivial, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -228,8 +228,9 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   geometry outlines), 64 animation effects (entrance, emphasis, exit, motion paths, media),
   triggers, by-paragraph builds, Animation Painter, on a shared timeline engine.
 - **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide, See All
-  Slides, click-to-zoom, pen, presenter window (black, white, zoom and the slide grid), rehearse
-  timings, custom shows, Set Up Show, Reading View; links and shape actions followed on click.
+  Slides, click-to-zoom, pen, presenter window (black, white, zoom, the slide grid, a timer that
+  pauses and resets, a local clock, and notes size), rehearse timings, custom shows, Set Up Show,
+  Reading View; links and shape actions followed on click.
 - **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom;
   grayscale.
 - **Review:** comments with replies and resolve, accessibility checker, a basic spelling list.
@@ -276,6 +277,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Slide show evidence includes presenter timer pause/reset, a local clock and notes size. Breadth stays 79% |
 | 2026-10-14 | trivial | Slide show evidence includes See All Slides and zoom. Breadth stays 79% |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |

From fd1b0a1965c52ac31f31fbed7a5a380e1525942a Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:12:18 +0300
Subject: [PATCH 260/376] Charts: draw the axes' titles

---
 crates/render/src/chart.rs | 17 +++++++++++++++++
 crates/render/src/tests.rs | 22 ++++++++++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..d9181472 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -246,6 +246,23 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     // Bars are drawn first and lines over them; a combo chart has both.
     let bar_kind = c.series.iter().map(|s| c.series_kind(s)).find(|k| k.is_bar_like());
     let horiz = if combo { bar_kind.is_some_and(ChartType::horizontal) } else { c.kind.horizontal() };
+    // Axis titles: the left one turned to read upwards, the bottom one centred under the axis.
+    // On a horizontal bar chart the category axis is the left one.
+    let (left_title, bottom_title) =
+        if horiz { (c.axis_titles.0.as_deref(), c.axis_titles.1.as_deref()) } else { (c.axis_titles.1.as_deref(), c.axis_titles.0.as_deref()) };
+    let band_h = base * 1.6;
+    if let Some(t) = bottom_title.filter(|t| !t.is_empty()) {
+        let r = Rect::new(area.x0, area.y1 - band_h, area.x1, area.y1);
+        label(ctx, rctx, m, t, r, base, Align::Center, Anchor::Bottom, text_col, true);
+        area.y1 -= band_h + base * 0.3;
+    }
+    if let Some(t) = left_title.filter(|t| !t.is_empty()) {
+        let (cx, cy) = (area.x0 + band_h / 2.0, (area.y0 + area.y1) / 2.0);
+        let turned = m * Affine::translate((cx, cy)) * Affine::rotate(-std::f64::consts::FRAC_PI_2);
+        let half = area.height() / 2.0;
+        label(ctx, rctx, turned, t, Rect::new(-half, -band_h / 2.0, half, band_h / 2.0), base, Align::Center, Anchor::Middle, text_col, true);
+        area.x0 += band_h + base * 0.3;
+    }
     // As many major units as the value axis has room for labels (PowerPoint's automatic unit).
     let axis_len = if horiz { area.width() - base * 4.5 } else { area.height() - base * 1.8 };
     let max_intervals = (axis_len / if horiz { base * 6.0 } else { base * 1.9 }).floor().clamp(2.0, 12.0) as usize;
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..9cf606af 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -155,6 +155,28 @@ fn combo_chart_draws_columns_and_a_line_on_its_own_axis() {
     assert!(col[0] < 250 || col[1] < 250 || col[2] < 250, "no column: {col:?}");
 }
 
+#[test]
+fn chart_axis_titles_are_drawn() {
+    let draw = |titles: (Option<String>, Option<String>)| {
+        let mut c = Chart::sample(ChartType::Column);
+        c.title = None;
+        c.legend = None;
+        c.axis_titles = titles;
+        let sh = Shape { id: ShapeId(624), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
+        render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() })
+    };
+    let ink = |img: &Image, r: (u32, u32, u32, u32)| {
+        (r.0..r.2).flat_map(|x| (r.1..r.3).map(move |y| (x, y))).filter(|(x, y)| img.pixel(*x, *y)[0] < 160).count()
+    };
+    let bare = draw((None, None));
+    let titled = draw((Some("Month".into()), Some("Revenue".into())));
+    // A turned "Revenue" down the left edge, "Month" along the bottom.
+    let left = (38, 150, 62, 390);
+    let bottom = (380, 490, 580, 520);
+    assert!(ink(&titled, left) > ink(&bare, left) + 30, "value axis title");
+    assert!(ink(&titled, bottom) > ink(&bare, bottom) + 30, "category axis title");
+}
+
 #[test]
 fn placeholder_prompts_only_in_edit_view() {
     let p = Presentation::default();

From dbffbab59d796345f864f16607053b39300f827f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:16:00 +0300
Subject: [PATCH 261/376] UI: Edit Photo Album reflows the album in one step

Reopen the Photo Album dialog on the current album and replace those slides
in one undo, with black and white, rotation, brightness, contrast and a theme.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                              |   5 +-
 crates/engine/src/cmd/insert.rs         | 557 +++++++++++++++++++++++-
 crates/ui-egui/src/dialogs.rs           | 319 ++++++++++----
 crates/ui-egui/src/menus.rs             |   1 +
 crates/ui-egui/src/photo_album_tests.rs |  37 +-
 crates/ui-egui/src/ribbon.rs            |  27 +-
 docs/architecture.md                    |   6 +-
 docs/gaps.md                            |   6 +-
 docs/target-app-parity.md               |   6 +-
 docs/ui-parity.md                       |   6 +-
 10 files changed, 844 insertions(+), 126 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 6643c0dd..f93c0ff6 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog; breadth stays 79%, ready ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Edit Photo Album; breadth stays 79%, ready ~55%; previous: trivial, Photo Album dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Edit Photo Album (`insert.photoAlbumEdit`): reopen the album's slides and re-flow them in one undo step, with black and white, rotation, brightness, contrast and an album theme. Breadth stays 79%, ready ~55% |
 | 2026-10-14 | Photo Album dialog (`insert.photoAlbum`): pictures and text boxes become slides in the open presentation, one undo step. Breadth stays 79%, ready ~55% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
@@ -151,7 +152,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
-| 2026-10-14 | trivial | Progress log: Photo Album dialog. Breadth stays 79%, ready ~55% |
+| 2026-10-14 | trivial | Progress log: Edit Photo Album. Breadth stays 79%, ready ~55% |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2b5e605a..25bd6031 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -38,10 +38,19 @@ pub fn specs() -> Vec<CommandSpec> {
             "Photo Album…",
             ["Insert", "Images"],
             None,
-            "{pictures?: [{path?|data: base64, name?} | {text}], layout?: fit|1|2|4|1title|2title|4title, frame?: none|rect|rounded|simple, captions?: bool} — omit pictures to open the dialog",
+            "{pictures?: [{path?|data: base64, name?, rot?: deg, brightness?: -1..1, contrast?: -1..1} | {text}], layout?: fit|1|2|4|1title|2title|4title, frame?: none|rect|rounded|simple, captions?: bool, grayscale?: bool, theme?: name} — omit pictures to open the dialog",
             has_doc,
             photo_album
         ),
+        cmd!(
+            "insert.photoAlbumEdit",
+            "Edit Photo Album…",
+            ["Insert", "Images"],
+            None,
+            "{album?: id, pictures?: same as insert.photoAlbum, layout?, frame?, captions?, grayscale?, theme?} — omit pictures to reopen the dialog on the current album",
+            has_doc,
+            photo_album_edit
+        ),
         cmd!("insert.table", "Table…", ["Insert", "Tables"], None, "{rows, cols, rect?}", has_slide, table),
         cmd!(
             "insert.chart",
@@ -408,6 +417,19 @@ struct AlbumPic {
     bytes: Vec<u8>,
     px_w: f64,
     px_h: f64,
+    rot: f64,
+    brightness: f64,
+    contrast: f64,
+}
+
+struct AlbumOpts {
+    layout_key: String,
+    frame_key: String,
+    layout: AlbumLayout,
+    frame: AlbumFrame,
+    captions: bool,
+    grayscale: bool,
+    theme: Option<String>,
 }
 
 enum AlbumItem {
@@ -425,22 +447,56 @@ enum AlbumSlide {
 /// PowerPoint starts a new presentation. These slides go into the open one, so the album is one
 /// undo step. Omitting `pictures` asks the UI to open the dialog and does not edit.
 fn photo_album(s: &mut Session, p: &Value) -> Result<Value> {
-    match p.get("pictures") {
-        None | Some(Value::Null) => {
-            s.ui_requests.push(crate::UiRequest::Dialog { id: "photoAlbum".into(), params: json!({}) });
-            return Ok(json!({"dialog": "photoAlbum"}));
-        }
-        Some(_) => {}
+    if p.get("pictures").is_none_or(Value::is_null) {
+        s.ui_requests.push(crate::UiRequest::Dialog { id: "photoAlbum".into(), params: json!({}) });
+        return Ok(json!({"dialog": "photoAlbum"}));
     }
-    let layout = album_layout(p)?;
-    let frame = album_frame(p)?;
-    let captions = album_captions(p)?;
+    let opts = album_opts(p)?;
     let items = album_items(p)?;
+    commit_album(s, items, opts, None)
+}
+
+fn photo_album_edit(s: &mut Session, p: &Value) -> Result<Value> {
+    if p.get("pictures").is_none_or(Value::is_null) {
+        let seed = album_seed(s)?;
+        let album = seed.get("album").cloned().unwrap_or(Value::Null);
+        s.ui_requests.push(crate::UiRequest::Dialog { id: "photoAlbum".into(), params: seed });
+        return Ok(json!({"dialog": "photoAlbum", "album": album}));
+    }
+    let opts = album_opts(p)?;
+    let items = album_items(p)?;
+    let (id, ids) = album_target(s, p)?;
+    commit_album(s, items, opts, Some((id, ids)))
+}
+
+fn commit_album(s: &mut Session, items: Vec<AlbumItem>, opts: AlbumOpts, replace: Option<(u32, Vec<u64>)>) -> Result<Value> {
     let (snapshot, sel) = {
         let st = s.doc()?;
         (st.doc.clone(), st.selection.clone())
     };
-    let result = insert_album(s, items, layout, frame, captions);
+    let result = (|| {
+        let album_id = match replace.as_ref().map(|(id, _)| *id) {
+            Some(id) if id != 0 => id,
+            _ => s.edit(|doc, _| Ok(doc.alloc_id()))?,
+        };
+        let at = if let Some((_, ids)) = &replace {
+            let st = s.doc()?;
+            let indices: Vec<usize> = ids.iter().filter_map(|id| st.doc.slide_index(deckcraft_model::SlideId(*id as u32))).collect();
+            let Some(at) = indices.iter().copied().min() else {
+                return Err(bad("insert.photoAlbumEdit", "that photo album is no longer in this presentation"));
+            };
+            s.execute("slide.delete", &json!({"ids": ids}))?;
+            Some(at)
+        } else {
+            None
+        };
+        let mut opts = opts;
+        if opts.theme.as_deref().unwrap_or("").is_empty() {
+            opts.theme = s.doc().ok().and_then(|st| st.doc.masters.first().map(|m| m.theme.name.clone())).filter(|n| !n.is_empty());
+        }
+        apply_theme_if_needed(s, opts.theme.as_deref())?;
+        insert_album(s, items, &opts, at, album_id)
+    })();
     if result.is_err()
         && let Some(st) = s.active_mut()
     {
@@ -495,6 +551,83 @@ fn album_captions(p: &Value) -> Result<bool> {
     }
 }
 
+fn album_bool(p: &Value, key: &str) -> Result<bool> {
+    match p.get(key) {
+        None | Some(Value::Null) => Ok(false),
+        Some(Value::Bool(v)) => Ok(*v),
+        Some(_) => Err(bad("insert.photoAlbum", format!("`{key}` must be true or false"))),
+    }
+}
+
+fn layout_key_of(layout: AlbumLayout) -> String {
+    if layout.fit {
+        return "fit".into();
+    }
+    let n = match layout.per {
+        2 => "2",
+        4 => "4",
+        _ => "1",
+    };
+    if layout.title { format!("{n}title") } else { n.into() }
+}
+
+fn frame_key_of(frame: AlbumFrame) -> &'static str {
+    match frame {
+        AlbumFrame::None => "none",
+        AlbumFrame::Rect => "rect",
+        AlbumFrame::Rounded => "rounded",
+        AlbumFrame::Simple => "simple",
+    }
+}
+
+fn album_opts(p: &Value) -> Result<AlbumOpts> {
+    let layout = album_layout(p)?;
+    let frame = album_frame(p)?;
+    let theme = match p.get("theme") {
+        None | Some(Value::Null) => None,
+        Some(Value::String(s)) if s.trim().is_empty() => None,
+        Some(Value::String(s)) => {
+            let name = s.trim();
+            let found = deckcraft_model::theme::builtin_themes().into_iter().find(|t| t.name.eq_ignore_ascii_case(name));
+            let Some(t) = found else {
+                return Err(bad("insert.photoAlbum", format!("unknown theme `{name}`")));
+            };
+            Some(t.name)
+        }
+        Some(_) => return Err(bad("insert.photoAlbum", "`theme` must be a theme name")),
+    };
+    Ok(AlbumOpts {
+        layout_key: layout_key_of(layout),
+        frame_key: frame_key_of(frame).into(),
+        layout,
+        frame,
+        captions: album_captions(p)?,
+        grayscale: album_bool(p, "grayscale")?,
+        theme,
+    })
+}
+
+/// A finite number, or 0 when the key is absent. A present non-number is an error.
+fn album_finite(item: &Value, key: &str) -> Result<f64> {
+    match item.get(key) {
+        None | Some(Value::Null) => Ok(0.0),
+        Some(v) => v.as_f64().filter(|n| n.is_finite()).ok_or_else(|| bad("insert.photoAlbum", format!("`{key}` must be a number"))),
+    }
+}
+
+fn album_rot(item: &Value) -> Result<f64> {
+    let n = album_finite(item, "rot")?;
+    Ok(((n % 360.0) + 360.0) % 360.0)
+}
+
+fn album_unit(item: &Value, key: &str) -> Result<f64> {
+    let n = album_finite(item, key)?;
+    if !(-1.0..=1.0).contains(&n) {
+        return Err(bad("insert.photoAlbum", format!("`{key}` must be between -1 and 1")));
+    }
+    Ok(n)
+}
+
 fn album_items(p: &Value) -> Result<Vec<AlbumItem>> {
     let Some(arr) = p.get("pictures").and_then(Value::as_array) else {
         return Err(bad("insert.photoAlbum", "`pictures` must be a list"));
@@ -543,7 +676,15 @@ fn album_items(p: &Value) -> Result<Vec<AlbumItem>> {
             return Err(bad("insert.photoAlbum", format!("{name}: the picture can't be read")));
         }
         let (px_w, px_h) = image_px(&bytes);
-        items.push(AlbumItem::Picture(AlbumPic { name, bytes, px_w, px_h }));
+        items.push(AlbumItem::Picture(AlbumPic {
+            name,
+            bytes,
+            px_w,
+            px_h,
+            rot: album_rot(item)?,
+            brightness: album_unit(item, "brightness")?,
+            contrast: album_unit(item, "contrast")?,
+        }));
     }
     Ok(items)
 }
@@ -665,17 +806,262 @@ fn apply_frame(s: &mut Session, frame: AlbumFrame, id: u64) -> Result<()> {
     Ok(())
 }
 
-fn insert_album(s: &mut Session, items: Vec<AlbumItem>, layout: AlbumLayout, frame: AlbumFrame, captions: bool) -> Result<Value> {
+struct AlbumMark {
+    id: u32,
+    layout: String,
+    frame: String,
+    captions: bool,
+    grayscale: bool,
+    theme: String,
+}
+
+fn parse_album_mark(raw: &str) -> Option<AlbumMark> {
+    let rest = raw.strip_prefix("deckcraft-album:")?;
+    let (id_str, rest) = rest.split_once(';').unwrap_or((rest, ""));
+    let id = id_str.parse::<u32>().ok().filter(|id| *id != 0)?;
+    let mut mark = AlbumMark { id, layout: String::new(), frame: String::new(), captions: false, grayscale: false, theme: String::new() };
+    if !rest.is_empty() {
+        for part in rest.split(';') {
+            let Some((k, v)) = part.split_once('=') else { continue };
+            match k {
+                "layout" => mark.layout = v.to_string(),
+                "frame" => mark.frame = v.to_string(),
+                "captions" => mark.captions = v == "1",
+                "gray" => mark.grayscale = v == "1",
+                "theme" => mark.theme = v.to_string(),
+                _ => {}
+            }
+        }
+    }
+    Some(mark)
+}
+
+fn album_marker(id: u32, opts: &AlbumOpts) -> String {
+    let theme = opts.theme.as_deref().unwrap_or("");
+    format!(
+        "deckcraft-album:{id};layout={};frame={};captions={};gray={};theme={theme}",
+        opts.layout_key,
+        opts.frame_key,
+        if opts.captions { 1 } else { 0 },
+        if opts.grayscale { 1 } else { 0 },
+    )
+}
+
+fn stamp_album_slide(s: &mut Session, album_id: u32, opts: &AlbumOpts) -> Result<()> {
+    let marker = album_marker(album_id, opts);
+    s.edit(|doc, sel| {
+        let Some(slide) = doc.slides.get_mut(sel.slide) else {
+            return Err(bad("insert.photoAlbum", "no slide to mark"));
+        };
+        let slide = std::sync::Arc::make_mut(slide);
+        if slide.raw_ext.as_deref().is_none_or(|ext| ext.starts_with("deckcraft-album:")) {
+            slide.raw_ext = Some(marker);
+        }
+        slide.name = "Photo Album".into();
+        Ok(())
+    })
+}
+
+fn apply_theme_if_needed(s: &mut Session, theme: Option<&str>) -> Result<()> {
+    let Some(name) = theme.filter(|n| !n.is_empty()) else { return Ok(()) };
+    let current = s.doc()?.doc.masters.first().map(|m| m.theme.name.clone()).unwrap_or_default();
+    if current.eq_ignore_ascii_case(name) {
+        return Ok(());
+    }
+    s.execute("design.theme", &json!({"name": name}))?;
+    Ok(())
+}
+
+fn album_id_param(p: &Value) -> Option<u32> {
+    match p.get("album") {
+        Some(Value::Number(n)) => n.as_u64().and_then(|v| u32::try_from(v).ok()).filter(|v| *v != 0),
+        Some(Value::String(s)) => s.trim().parse::<u32>().ok().filter(|v| *v != 0),
+        _ => None,
+    }
+}
+
+fn slides_with_album(doc: &deckcraft_model::Presentation, id: u32) -> Vec<u64> {
+    doc.slides.iter().filter(|s| s.raw_ext.as_deref().and_then(parse_album_mark).is_some_and(|m| m.id == id)).map(|s| u64::from(s.id.0)).collect()
+}
+
+fn album_name_run(doc: &deckcraft_model::Presentation, index: usize) -> Vec<u64> {
+    if doc.slides.get(index).is_none_or(|s| s.name != "Photo Album") {
+        return Vec::new();
+    }
+    let mut start = index;
+    while start > 0 && doc.slides.get(start - 1).is_some_and(|s| s.name == "Photo Album") {
+        start -= 1;
+    }
+    let mut end = index;
+    while doc.slides.get(end + 1).is_some_and(|s| s.name == "Photo Album") {
+        end += 1;
+    }
+    doc.slides[start..=end].iter().map(|s| u64::from(s.id.0)).collect()
+}
+
+/// The album under the selection, or the one named by `album`. Id 0 is a name-only run (no marker).
+fn album_target(s: &Session, p: &Value) -> Result<(u32, Vec<u64>)> {
+    let st = s.doc()?;
+    if let Some(id) = album_id_param(p) {
+        let ids = slides_with_album(&st.doc, id);
+        if ids.is_empty() {
+            return Err(bad("insert.photoAlbumEdit", "that photo album is no longer in this presentation"));
+        }
+        return Ok((id, ids));
+    }
+    let Some(slide) = st.doc.slides.get(st.selection.slide) else {
+        return Err(bad("insert.photoAlbumEdit", "this slide is not part of a photo album"));
+    };
+    if let Some(mark) = slide.raw_ext.as_deref().and_then(parse_album_mark) {
+        let ids = slides_with_album(&st.doc, mark.id);
+        if ids.is_empty() {
+            return Err(bad("insert.photoAlbumEdit", "this slide is not part of a photo album"));
+        }
+        return Ok((mark.id, ids));
+    }
+    if slide.name == "Photo Album" {
+        let ids = album_name_run(&st.doc, st.selection.slide);
+        if !ids.is_empty() {
+            return Ok((0, ids));
+        }
+    }
+    Err(bad("insert.photoAlbumEdit", "this slide is not part of a photo album"))
+}
+
+fn pic_count(slide: &deckcraft_model::Slide) -> usize {
+    slide.shapes.iter().filter(|sh| matches!(sh.kind, ShapeKind::Picture { .. })).count()
+}
+
+fn infer_album(slides: &[&deckcraft_model::Slide], theme_now: &str) -> (String, String, bool, bool, String) {
+    let max_pics = slides.iter().map(|s| pic_count(s)).max().unwrap_or(1);
+    let per = if max_pics >= 3 {
+        "4"
+    } else if max_pics == 2 {
+        "2"
+    } else {
+        "1"
+    };
+    let title =
+        slides.iter().any(|s| pic_count(s) > 0 && s.shapes.iter().any(|sh| sh.text_box && sh.xfrm.is_some_and(|x| x.y < 36.0 && x.h <= 48.0)));
+    let layout = if title { format!("{per}title") } else { per.into() };
+    let width = slides.iter().find_map(|s| {
+        s.shapes.iter().find_map(|sh| match &sh.kind {
+            ShapeKind::Picture { .. } => sh.line.as_ref().and_then(|l| l.width),
+            _ => None,
+        })
+    });
+    let frame = match width {
+        None => "none",
+        Some(w) if (w - 6.0).abs() < 0.2 => "simple",
+        Some(w) if (w - 2.25).abs() < 0.2 => "rounded",
+        Some(w) if w < 0.2 => "none",
+        Some(_) => "rect",
+    };
+    let captions = slides.iter().any(|s| {
+        let bottoms: Vec<f64> =
+            s.shapes.iter().filter(|sh| matches!(sh.kind, ShapeKind::Picture { .. })).filter_map(|sh| sh.xfrm.map(|x| x.y + x.h)).collect();
+        !bottoms.is_empty() && s.shapes.iter().any(|sh| sh.text_box && sh.xfrm.is_some_and(|x| bottoms.iter().any(|b| x.y + 1.0 >= *b)))
+    });
+    let mut any = false;
+    let mut gray = true;
+    for s in slides {
+        for sh in &s.shapes {
+            if let ShapeKind::Picture { fill } = &sh.kind {
+                any = true;
+                gray &= fill.adjust.grayscale;
+            }
+        }
+    }
+    (layout, frame.into(), captions, any && gray, theme_now.to_string())
+}
+
+fn items_from_slides(doc: &deckcraft_model::Presentation, slides: &[&deckcraft_model::Slide]) -> Vec<Value> {
+    let mut items = Vec::new();
+    for slide in slides {
+        let pics: Vec<&deckcraft_model::Shape> = slide.shapes.iter().filter(|sh| matches!(sh.kind, ShapeKind::Picture { .. })).collect();
+        if pics.is_empty() {
+            let text = slide
+                .shapes
+                .iter()
+                .filter(|sh| sh.text_box)
+                .filter_map(|sh| sh.text.as_ref().map(|t| t.text()))
+                .find(|t| !t.trim().is_empty())
+                .unwrap_or_default();
+            if !text.trim().is_empty() {
+                items.push(json!({"text": text.trim()}));
+            }
+            continue;
+        }
+        for sh in pics {
+            let ShapeKind::Picture { fill } = &sh.kind else { continue };
+            let media = doc.media(fill.media);
+            let name = if !sh.descr.is_empty() {
+                sh.descr.clone()
+            } else {
+                media.map(|m| m.name.clone()).filter(|n| !n.is_empty()).unwrap_or_else(|| "picture".into())
+            };
+            items.push(json!({
+                "name": name,
+                "data": media.map(|m| base64_encode(&m.data)).unwrap_or_default(),
+                "rot": sh.xfrm.map(|x| x.rot).unwrap_or(0.0),
+                "brightness": fill.adjust.brightness,
+                "contrast": fill.adjust.contrast,
+            }));
+        }
+    }
+    items
+}
+
+fn album_seed(s: &Session) -> Result<Value> {
+    let (id, ids) = album_target(s, &Value::Null)?;
+    let st = s.doc()?;
+    let slides: Vec<&deckcraft_model::Slide> =
+        ids.iter().filter_map(|sid| u32::try_from(*sid).ok()).filter_map(|n| st.doc.slide(deckcraft_model::SlideId(n))).collect();
+    let theme_now = st.doc.masters.first().map(|m| m.theme.name.clone()).filter(|n| !n.is_empty()).unwrap_or_else(|| "DeckCraft".into());
+    let inferred = infer_album(&slides, &theme_now);
+    let mark = slides.first().and_then(|sl| sl.raw_ext.as_deref().and_then(parse_album_mark));
+    let (layout, frame, captions, grayscale, theme) = if let Some(mark) = mark {
+        (
+            if mark.layout.is_empty() { inferred.0 } else { mark.layout },
+            if mark.frame.is_empty() { inferred.1 } else { mark.frame },
+            mark.captions,
+            mark.grayscale,
+            if mark.theme.is_empty() { theme_now } else { mark.theme },
+        )
+    } else {
+        inferred
+    };
+    Ok(json!({
+        "album": if id == 0 { Value::Null } else { json!(id) },
+        "layout": layout,
+        "frame": frame,
+        "captions": captions,
+        "grayscale": grayscale,
+        "theme": theme,
+        "items": items_from_slides(&st.doc, &slides),
+    }))
+}
+
+fn insert_album(s: &mut Session, items: Vec<AlbumItem>, opts: &AlbumOpts, at: Option<usize>, album_id: u32) -> Result<Value> {
     let (width, height, first) = {
         let st = s.doc()?;
-        let first = if st.doc.slides.is_empty() { 0 } else { st.selection.slide.saturating_add(1) };
+        let first = at.unwrap_or_else(|| if st.doc.slides.is_empty() { 0 } else { st.selection.slide.saturating_add(1) });
         (st.doc.slide_size.width, st.doc.slide_size.height, first)
     };
+    let layout = opts.layout;
+    let frame = opts.frame;
+    let captions = opts.captions;
     let plan = album_plan(items, layout.per);
     let mut slides = 0usize;
     let mut pictures = 0usize;
+    let mut pin = at;
     for slide in plan {
-        s.execute("slide.new", &json!({"layout": "blank"}))?;
+        if let Some(index) = pin.take() {
+            s.execute("slide.new", &json!({"layout": "blank", "at": index}))?;
+        } else {
+            s.execute("slide.new", &json!({"layout": "blank"}))?;
+        }
+        stamp_album_slide(s, album_id, opts)?;
         slides += 1;
         match slide {
             AlbumSlide::Text(text) => {
@@ -696,6 +1082,15 @@ fn insert_album(s: &mut Session, items: Vec<AlbumItem>, layout: AlbumLayout, fra
                         return Err(bad("insert.photoAlbum", "the picture was not inserted"));
                     };
                     apply_frame(s, frame, id)?;
+                    if opts.grayscale || pic.brightness.abs() > 1e-6 || pic.contrast.abs() > 1e-6 {
+                        s.execute(
+                            "picture.adjust",
+                            &json!({"id": id, "grayscale": opts.grayscale, "brightness": pic.brightness, "contrast": pic.contrast}),
+                        )?;
+                    }
+                    if pic.rot > 0.01 {
+                        s.execute("shape.rotate", &json!({"id": id, "deg": pic.rot}))?;
+                    }
                     pictures += 1;
                     if let Some(cap) = cell.caption {
                         s.execute("insert.textBox", &json!({"rect": cap, "text": file_stem(&pic.name)}))?;
@@ -708,7 +1103,7 @@ fn insert_album(s: &mut Session, items: Vec<AlbumItem>, layout: AlbumLayout, fra
         }
     }
     s.execute("slide.go", &json!({"index": first}))?;
-    Ok(json!({"slides": slides, "first": first, "pictures": pictures}))
+    Ok(json!({"slides": slides, "first": first, "pictures": pictures, "album": album_id}))
 }
 
 fn table(s: &mut Session, p: &Value) -> Result<Value> {
@@ -1294,4 +1689,134 @@ mod tests {
         assert_eq!(n_slides(&s), 2);
         assert_eq!(pictures(&s, 1).len(), 4);
     }
+
+    fn adjust(s: &Session, index: usize) -> deckcraft_model::style::PictureAdjust {
+        match &pictures(s, index)[0].kind {
+            ShapeKind::Picture { fill } => fill.adjust.clone(),
+            _ => panic!("picture"),
+        }
+    }
+
+    fn theme_name(s: &Session) -> String {
+        s.active().and_then(|d| d.doc.masters.first()).map(|m| m.theme.name.clone()).unwrap_or_default()
+    }
+
+    #[test]
+    fn edit_without_pictures_reopens_the_dialog() {
+        let mut s = Session::with_new();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("hill.png"), pic("lake.png")], "layout": "1"})).unwrap();
+        s.ui_requests.clear();
+        let before = n_slides(&s);
+        let undos = s.active().unwrap().history.undo.len();
+        let r = s.execute("insert.photoAlbumEdit", &json!({})).expect("reopen");
+        assert_eq!(r["dialog"], "photoAlbum");
+        assert_eq!(n_slides(&s), before);
+        assert_eq!(s.active().unwrap().history.undo.len(), undos);
+        let params = match &s.ui_requests[0] {
+            crate::UiRequest::Dialog { id, params } => {
+                assert_eq!(id, "photoAlbum");
+                params
+            }
+            other => panic!("dialog request, got {other:?}"),
+        };
+        assert_eq!(params["items"][0]["name"], "hill.png");
+        assert_eq!(params["items"][1]["name"], "lake.png");
+        assert_eq!(params["layout"], "1");
+        assert!(params["album"].as_u64().unwrap_or(0) > 0);
+    }
+
+    #[test]
+    fn edit_reflows_the_album_in_one_undo() {
+        let mut s = Session::with_new();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("hill.png"), pic("lake.png")], "layout": "1"})).unwrap();
+        assert_eq!(n_slides(&s), 3);
+        let r = s.execute("insert.photoAlbumEdit", &json!({"pictures": [pic("hill.png"), pic("lake.png")], "layout": "2"})).expect("reflow");
+        assert_eq!(r["slides"], 1);
+        assert_eq!(n_slides(&s), 2);
+        assert_eq!(pictures(&s, 1).len(), 2);
+        let undo = &s.active().unwrap().history.undo;
+        assert_eq!(undo.last().map(|u| u.label.as_str()), Some("Edit Photo Album…"));
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(n_slides(&s), 3);
+        assert_eq!(pictures(&s, 1).len(), 1);
+        assert_eq!(pictures(&s, 2).len(), 1);
+    }
+
+    #[test]
+    fn picture_options_and_theme_are_one_step() {
+        let mut s = Session::with_new();
+        s.execute(
+            "insert.photoAlbum",
+            &json!({"pictures": [{"name": "hill.png", "data": base64_encode(&png()), "rot": 90, "brightness": 0.2, "contrast": -0.1}], "grayscale": true, "theme": "Harbor"}),
+        )
+        .unwrap();
+        let adj = adjust(&s, 1);
+        assert!(adj.grayscale);
+        assert!((adj.brightness - 0.2).abs() < 1e-6);
+        assert!((adj.contrast + 0.1).abs() < 1e-6);
+        assert!((pictures(&s, 1)[0].xfrm.unwrap().rot - 90.0).abs() < 0.01);
+        assert_eq!(theme_name(&s), "Harbor");
+        let mark = s.active().unwrap().doc.slides[1].raw_ext.clone().unwrap_or_default();
+        assert!(mark.contains("gray=1"), "{mark}");
+        assert!(mark.contains("theme=Harbor"), "{mark}");
+        assert_eq!(s.active().unwrap().doc.slides[1].name, "Photo Album");
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(theme_name(&s), "DeckCraft");
+        assert_eq!(n_slides(&s), 1);
+    }
+
+    #[test]
+    fn unknown_theme_and_a_plain_slide_change_nothing() {
+        let mut s = Session::with_new();
+        let before = n_slides(&s);
+        let err = s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")], "theme": "NotATheme"})).unwrap_err();
+        assert!(err.to_string().contains("unknown theme"), "{err}");
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png"), {"brightness": "high"}]})).is_err());
+        assert!(s.execute("insert.photoAlbum", &json!({"pictures": [{"name": "a.png", "data": base64_encode(&png()), "brightness": 2}]})).is_err());
+        let err = s.execute("insert.photoAlbumEdit", &json!({})).unwrap_err();
+        assert!(err.to_string().contains("not part of a photo album"), "{err}");
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png")]})).unwrap();
+        s.execute("slide.go", &json!({"index": 0})).unwrap();
+        assert!(s.execute("insert.photoAlbumEdit", &json!({"pictures": [pic("b.png")], "layout": "2"})).is_err());
+        assert_eq!(n_slides(&s), before + 1);
+        assert_eq!(pictures(&s, 1).len(), 1);
+        assert_eq!(theme_name(&s), "DeckCraft");
+    }
+
+    #[test]
+    fn two_albums_stay_independent() {
+        let mut s = Session::with_new();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png"), pic("b.png")], "layout": "1"})).unwrap();
+        let last = n_slides(&s) - 1;
+        s.execute("slide.go", &json!({"index": last})).unwrap();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("c.png"), pic("d.png")], "layout": "1"})).unwrap();
+        assert_eq!(n_slides(&s), 5);
+        s.execute("insert.photoAlbumEdit", &json!({"pictures": [pic("c.png"), pic("d.png")], "layout": "2"})).unwrap();
+        assert_eq!(n_slides(&s), 4);
+        assert_eq!(pictures(&s, 1).len(), 1);
+        assert_eq!(pictures(&s, 2).len(), 1);
+        assert_eq!(pictures(&s, 3).len(), 2);
+        let first = s.active().unwrap().doc.slides[1].raw_ext.clone().unwrap_or_default();
+        let second = s.active().unwrap().doc.slides[3].raw_ext.clone().unwrap_or_default();
+        assert!(first.starts_with("deckcraft-album:"));
+        assert!(second.starts_with("deckcraft-album:"));
+        assert_ne!(first.split(';').next(), second.split(';').next());
+    }
+
+    #[test]
+    fn a_named_run_without_a_marker_still_reflows() {
+        let mut s = Session::with_new();
+        s.execute("insert.photoAlbum", &json!({"pictures": [pic("a.png"), pic("b.png")], "layout": "1"})).unwrap();
+        {
+            let doc = std::sync::Arc::make_mut(&mut s.active_mut().unwrap().doc);
+            for sl in doc.slides.iter_mut().skip(1) {
+                std::sync::Arc::make_mut(sl).raw_ext = None;
+            }
+        }
+        s.execute("insert.photoAlbumEdit", &json!({"pictures": [pic("a.png"), pic("b.png")], "layout": "2"})).unwrap();
+        assert_eq!(n_slides(&s), 2);
+        assert_eq!(pictures(&s, 1).len(), 2);
+        let mark = s.active().unwrap().doc.slides[1].raw_ext.clone().unwrap_or_default();
+        assert!(mark.starts_with("deckcraft-album:"), "{mark}");
+    }
 }
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index eda8a436..ad468d48 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -185,106 +185,213 @@ fn pick_album_picture(app: &mut SlideApp) -> Option<Value> {
 fn album_choice(ui: &mut Ui, d: &mut Dialog, id: &str, key: &str, default: &str, choices: &[(&str, &str)]) {
     let cur = d.get(key, default);
     let label = choices.iter().find(|(k, _)| *k == cur).map(|(_, l)| *l).unwrap_or(default);
-    egui::ComboBox::from_id_salt(id).selected_text(label).width(220.0).show_ui(ui, |ui| {
+    let opened = egui::ComboBox::from_id_salt(id).selected_text(label).width(220.0).show_ui(ui, |ui| {
         for (k, l) in choices {
             if ui.selectable_label(cur == *k, *l).clicked() {
                 d.fields.insert(key.into(), (*k).to_string());
             }
         }
     });
+    opened.response.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::ComboBox, true, label));
+}
+
+const ALBUM_THEMES: &[&str] = &["DeckCraft", "Harbor", "Ember", "Meadow", "Nocturne", "Paper", "Coral Reef", "Slate"];
+
+fn current_theme(app: &SlideApp) -> String {
+    app.session
+        .active()
+        .and_then(|d| d.doc.masters.first())
+        .map(|m| m.theme.name.clone())
+        .filter(|n| !n.is_empty())
+        .unwrap_or_else(|| "DeckCraft".into())
+}
+
+fn album_json_id(v: &Value) -> Option<u64> {
+    v.as_u64().or_else(|| v.as_str().and_then(|s| s.trim().parse().ok()))
+}
+
+/// Copy a command's dialog params into fields once. A fresh album has no `items`.
+fn seed_photo_album(app: &SlideApp, d: &mut Dialog) {
+    if d.fields.contains_key("seeded") {
+        return;
+    }
+    d.fields.insert("seeded".into(), "1".into());
+    let p = d.params.clone();
+    if let Some(items) = p.get("items").and_then(Value::as_array) {
+        store_album_items(d, items);
+        d.fields.insert("editing".into(), "1".into());
+    }
+    for key in ["layout", "frame", "theme"] {
+        if let Some(v) = p.get(key).and_then(Value::as_str).filter(|s| !s.is_empty()) {
+            d.fields.insert(key.into(), v.to_string());
+        }
+    }
+    for key in ["captions", "grayscale"] {
+        if let Some(v) = p.get(key).and_then(Value::as_bool) {
+            d.fields.insert(key.into(), if v { "1".into() } else { "0".into() });
+        }
+    }
+    if let Some(id) = p.get("album").and_then(album_json_id).filter(|n| *n != 0) {
+        d.fields.insert("album".into(), id.to_string());
+    }
+    let theme_was = d.fields.get("theme").cloned().filter(|s| !s.is_empty()).unwrap_or_else(|| current_theme(app));
+    if !d.fields.contains_key("theme") {
+        d.fields.insert("theme".into(), theme_was.clone());
+    }
+    d.fields.entry("themeWas".into()).or_insert(theme_was);
+}
+
+fn selected_album_picture(d: &Dialog, items: &[Value]) -> bool {
+    let i = d.fields.get("sel").and_then(|s| s.parse::<usize>().ok()).unwrap_or(0);
+    items.get(i).is_some_and(|item| item.get("data").is_some() || item.get("path").is_some())
+}
+
+fn with_selected_picture(d: &mut Dialog, f: impl FnOnce(&mut serde_json::Map<String, Value>)) {
+    let Some(mut list) = album_items(d) else { return };
+    let i = d.fields.get("sel").and_then(|s| s.parse::<usize>().ok()).unwrap_or(0);
+    let Some(item) = list.get_mut(i) else { return };
+    if item.get("data").is_none() && item.get("path").is_none() {
+        return;
+    }
+    let Some(obj) = item.as_object_mut() else { return };
+    f(obj);
+    store_album_items(d, &list);
 }
 
 /// Photo Album. Returns true when the dialog should close.
 fn photo_album_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
-    ui.set_min_width(400.0);
-    ui.label("Pictures in album");
-    let items = album_items(d).unwrap_or_default();
-    let mut sel = d.get("sel", "0").parse::<usize>().unwrap_or(0);
-    egui::ScrollArea::vertical().max_height(140.0).id_salt("album_list").show(ui, |ui| {
-        if items.is_empty() {
-            ui.label(egui::RichText::new("No pictures yet").color(Tokens::get(ui.ctx()).text_dim));
-        }
-        for (i, item) in items.iter().enumerate() {
-            if ui.selectable_label(sel == i, album_item_label(item)).clicked() {
-                sel = i;
+    seed_photo_album(app, d);
+    ui.set_min_width(440.0);
+    egui::ScrollArea::vertical().max_height(520.0).id_salt("album_body").show(ui, |ui| {
+        ui.set_min_width(420.0);
+        ui.label("Pictures in album");
+        let items = album_items(d).unwrap_or_default();
+        let mut sel = d.get("sel", "0").parse::<usize>().unwrap_or(0);
+        // Fixed height so adding pictures does not push Create past the window.
+        egui::ScrollArea::vertical().max_height(120.0).min_scrolled_height(120.0).auto_shrink([false, false]).id_salt("album_list").show(ui, |ui| {
+            if items.is_empty() {
+                ui.label(egui::RichText::new("No pictures yet").color(Tokens::get(ui.ctx()).text_dim));
             }
-        }
-    });
-    d.fields.insert("sel".into(), sel.to_string());
-    ui.horizontal(|ui| {
-        if ui.button("Add Pictures…").clicked()
-            && let Some(item) = pick_album_picture(app)
-        {
-            match album_items(d) {
-                Some(mut list) if list.len() < 48 => {
-                    list.push(item);
-                    let next = list.len().saturating_sub(1);
-                    store_album_items(d, &list);
-                    d.fields.insert("sel".into(), next.to_string());
-                }
-                Some(_) => app.set_status("A photo album holds at most 48 pictures or text boxes"),
-                None => app.set_status("The picture list is invalid"),
-            }
-        }
-        if ui.button("New Text Box").clicked() {
-            let text = d.get("boxText", "Text Box");
-            let text = text.trim();
-            if text.is_empty() {
-                app.set_status("Type the text for the new text box");
-            } else if text.chars().count() > 400 {
-                app.set_status("Text is longer than 400 characters");
-            } else if let Some(mut list) = album_items(d) {
-                if list.len() >= 48 {
-                    app.set_status("A photo album holds at most 48 pictures or text boxes");
-                } else {
-                    list.push(json!({"text": text}));
-                    let next = list.len().saturating_sub(1);
-                    store_album_items(d, &list);
-                    d.fields.insert("sel".into(), next.to_string());
+            for (i, item) in items.iter().enumerate() {
+                if ui.selectable_label(sel == i, album_item_label(item)).clicked() {
+                    sel = i;
                 }
             }
-        }
-        if ui.button("Remove").clicked()
-            && let Some(mut list) = album_items(d)
-            && let Some(i) = d.get("sel", "0").parse::<usize>().ok()
-            && i < list.len()
-        {
-            list.remove(i);
-            store_album_items(d, &list);
-            let next = i.min(list.len().saturating_sub(1));
-            d.fields.insert("sel".into(), next.to_string());
-        }
+        });
+        d.fields.insert("sel".into(), sel.to_string());
+        ui.horizontal(|ui| {
+            if ui.button("Add Pictures…").clicked()
+                && let Some(item) = pick_album_picture(app)
+            {
+                match album_items(d) {
+                    Some(mut list) if list.len() < 48 => {
+                        list.push(item);
+                        let next = list.len().saturating_sub(1);
+                        store_album_items(d, &list);
+                        d.fields.insert("sel".into(), next.to_string());
+                    }
+                    Some(_) => app.set_status("A photo album holds at most 48 pictures or text boxes"),
+                    None => app.set_status("The picture list is invalid"),
+                }
+            }
+            if ui.button("New Text Box").clicked() {
+                let text = d.get("boxText", "Text Box");
+                let text = text.trim();
+                if text.is_empty() {
+                    app.set_status("Type the text for the new text box");
+                } else if text.chars().count() > 400 {
+                    app.set_status("Text is longer than 400 characters");
+                } else if let Some(mut list) = album_items(d) {
+                    if list.len() >= 48 {
+                        app.set_status("A photo album holds at most 48 pictures or text boxes");
+                    } else {
+                        list.push(json!({"text": text}));
+                        let next = list.len().saturating_sub(1);
+                        store_album_items(d, &list);
+                        d.fields.insert("sel".into(), next.to_string());
+                    }
+                }
+            }
+            if ui.button("Remove").clicked()
+                && let Some(mut list) = album_items(d)
+                && let Some(i) = d.get("sel", "0").parse::<usize>().ok()
+                && i < list.len()
+            {
+                list.remove(i);
+                store_album_items(d, &list);
+                let next = i.min(list.len().saturating_sub(1));
+                d.fields.insert("sel".into(), next.to_string());
+            }
+        });
+        field(ui, d, "Text box:", "boxText", "Text Box");
+        let picture = selected_album_picture(d, &items);
+        ui.label(album_picture_status(&items, sel));
+        ui.horizontal_wrapped(|ui| {
+            ui.add_enabled_ui(picture, |ui| {
+                if ui.button("Rotate Left").clicked() {
+                    with_selected_picture(d, |obj| {
+                        let cur = obj.get("rot").and_then(Value::as_f64).unwrap_or(0.0);
+                        let next = ((cur - 90.0) % 360.0 + 360.0) % 360.0;
+                        obj.insert("rot".into(), json!(next));
+                    });
+                }
+                if ui.button("Rotate Right").clicked() {
+                    with_selected_picture(d, |obj| {
+                        let cur = obj.get("rot").and_then(Value::as_f64).unwrap_or(0.0);
+                        let next = ((cur + 90.0) % 360.0 + 360.0) % 360.0;
+                        obj.insert("rot".into(), json!(next));
+                    });
+                }
+                if ui.button("More Brightness").clicked() {
+                    nudge_picture(d, "brightness", 0.1);
+                }
+                if ui.button("Less Brightness").clicked() {
+                    nudge_picture(d, "brightness", -0.1);
+                }
+                if ui.button("More Contrast").clicked() {
+                    nudge_picture(d, "contrast", 0.1);
+                }
+                if ui.button("Less Contrast").clicked() {
+                    nudge_picture(d, "contrast", -0.1);
+                }
+            });
+        });
+        ui.add_space(4.0);
+        ui.label("Picture layout");
+        album_choice(
+            ui,
+            d,
+            "album_layout",
+            "layout",
+            "1",
+            &[
+                ("fit", "Fit to slide"),
+                ("1", "1 picture"),
+                ("2", "2 pictures"),
+                ("4", "4 pictures"),
+                ("1title", "1 picture with title"),
+                ("2title", "2 pictures with title"),
+                ("4title", "4 pictures with title"),
+            ],
+        );
+        ui.label("Frame shape");
+        album_choice(
+            ui,
+            d,
+            "album_frame",
+            "frame",
+            "rect",
+            &[("none", "None"), ("rect", "Rectangle"), ("rounded", "Rounded"), ("simple", "Simple, white")],
+        );
+        check(ui, d, "Captions under pictures", "captions", false);
+        check(ui, d, "ALL pictures black and white", "grayscale", false);
+        ui.label("Album theme");
+        album_choice(ui, d, "album_theme", "theme", "DeckCraft", &ALBUM_THEMES.iter().map(|n| (*n, *n)).collect::<Vec<_>>());
     });
-    field(ui, d, "Text box:", "boxText", "Text Box");
-    ui.add_space(4.0);
-    ui.label("Picture layout");
-    album_choice(
-        ui,
-        d,
-        "album_layout",
-        "layout",
-        "1",
-        &[
-            ("fit", "Fit to slide"),
-            ("1", "1 picture"),
-            ("2", "2 pictures"),
-            ("4", "4 pictures"),
-            ("1title", "1 picture with title"),
-            ("2title", "2 pictures with title"),
-            ("4title", "4 pictures with title"),
-        ],
-    );
-    ui.label("Frame shape");
-    album_choice(
-        ui,
-        d,
-        "album_frame",
-        "frame",
-        "rect",
-        &[("none", "None"), ("rect", "Rectangle"), ("rounded", "Rounded"), ("simple", "Simple, white")],
-    );
-    let captions = check(ui, d, "Captions under pictures", "captions", false);
-    let (ok, cancel) = buttons(ui, "Create");
+    let captions = d.fields.get("captions").is_some_and(|v| v == "1");
+    let grayscale = d.fields.get("grayscale").is_some_and(|v| v == "1");
+    let editing = d.fields.get("editing").is_some_and(|v| v == "1");
+    let (ok, cancel) = buttons(ui, if editing { "Update" } else { "Create" });
     if ok {
         let Some(list) = album_items(d) else {
             app.set_status("The picture list is invalid");
@@ -296,11 +403,49 @@ fn photo_album_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
         }
         let layout = d.get("layout", "1");
         let frame = d.get("frame", "rect");
-        return app.run("insert.photoAlbum", json!({"pictures": list, "layout": layout, "frame": frame, "captions": captions})).is_ok();
+        let theme = d.get("theme", "DeckCraft");
+        let theme_was = d.fields.get("themeWas").cloned().unwrap_or_default();
+        let mut payload = json!({"pictures": list, "layout": layout, "frame": frame, "captions": captions, "grayscale": grayscale});
+        if theme != theme_was
+            && let Some(obj) = payload.as_object_mut()
+        {
+            obj.insert("theme".into(), json!(theme));
+        }
+        if editing {
+            if let Some(album) = d.fields.get("album").filter(|s| !s.is_empty() && s.as_str() != "0")
+                && let Ok(id) = album.parse::<u64>()
+                && let Some(obj) = payload.as_object_mut()
+            {
+                obj.insert("album".into(), json!(id));
+            }
+            return app.run("insert.photoAlbumEdit", payload).is_ok();
+        }
+        return app.run("insert.photoAlbum", payload).is_ok();
     }
     cancel
 }
 
+fn album_picture_status(items: &[Value], sel: usize) -> String {
+    let Some(item) = items.get(sel) else {
+        return "Select a picture to rotate it or change brightness and contrast".into();
+    };
+    if item.get("data").is_none() && item.get("path").is_none() {
+        return "Text boxes have no picture options".into();
+    }
+    let rot = item.get("rot").and_then(Value::as_f64).unwrap_or(0.0);
+    let brightness = item.get("brightness").and_then(Value::as_f64).unwrap_or(0.0);
+    let contrast = item.get("contrast").and_then(Value::as_f64).unwrap_or(0.0);
+    format!("Rotation {rot:.0}°, brightness {brightness:.1}, contrast {contrast:.1}")
+}
+
+fn nudge_picture(d: &mut Dialog, key: &str, delta: f64) {
+    with_selected_picture(d, |obj| {
+        let cur = obj.get(key).and_then(Value::as_f64).unwrap_or(0.0);
+        let next = (((cur + delta) * 10.0).round() / 10.0).clamp(-1.0, 1.0);
+        obj.insert(key.into(), json!(next));
+    });
+}
+
 /// Returns true when the dialog should close.
 fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     let run = |app: &mut SlideApp, id: &str, p: Value| {
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 9c4f7b4f..63cf1f8a 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -216,6 +216,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Chart", "insert.chart"),
                 ("Picture from File…", "app.insertPictureDialog"),
                 ("Photo Album…", "insert.photoAlbum"),
+                ("Edit Photo Album…", "insert.photoAlbumEdit"),
                 ("Audio from File…", "app.insertAudioDialog"),
                 ("Video from File…", "app.insertVideoDialog"),
             ],
diff --git a/crates/ui-egui/src/photo_album_tests.rs b/crates/ui-egui/src/photo_album_tests.rs
index fbd4e2c7..b97abe4e 100644
--- a/crates/ui-egui/src/photo_album_tests.rs
+++ b/crates/ui-egui/src/photo_album_tests.rs
@@ -18,7 +18,7 @@ fn png() -> Vec<u8> {
 }
 
 fn harness(app: SlideApp) -> Harness<'static, SlideApp> {
-    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 900.0)).with_step_dt(1.0 / 60.0).build_ui_state(
+    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 1200.0)).with_step_dt(1.0 / 60.0).build_ui_state(
         |ui, app: &mut SlideApp| {
             app.logic(ui.ctx());
             app.ui(ui);
@@ -76,6 +76,41 @@ fn create_inserts_the_album_in_one_step() {
     assert_eq!(text, ["Text Box"]);
 }
 
+#[test]
+fn update_reflows_the_open_album() {
+    let data = deckcraft_engine::cmd::base64_encode(&png());
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.run("insert.photoAlbum", json!({"pictures": [{"name": "hill.png", "data": data}, {"name": "lake.png", "data": data}], "layout": "1"}))
+        .expect("create");
+    assert_eq!(slides_of(&app), 3);
+    app.run("insert.photoAlbumEdit", json!({})).expect("edit");
+    let mut h = harness(app);
+    assert!(h.query_by_label("hill.png").is_some(), "the album's pictures are listed");
+    assert!(h.query_by_label("Update").is_some());
+    h.get_by_label("ALL pictures black and white").click();
+    h.run_steps(2);
+    h.get_by_label("1 picture").click();
+    h.run_steps(2);
+    h.get_by_label("2 pictures").click();
+    h.run_steps(2);
+    h.get_by_label("Update").click();
+    h.run_steps(4);
+    assert!(h.state().dialog.is_none(), "Update closes the dialog");
+    assert_eq!(slides(&h), 2);
+    let st = h.state().session.active().unwrap();
+    assert_eq!(st.history.undo.last().map(|u| u.label.as_str()), Some("Edit Photo Album…"));
+    let pics: Vec<_> = st.doc.slides[1].shapes.iter().filter(|sh| matches!(sh.kind, ShapeKind::Picture { .. })).collect();
+    assert_eq!(pics.len(), 2);
+    match &pics[0].kind {
+        ShapeKind::Picture { fill } => assert!(fill.adjust.grayscale),
+        _ => panic!("picture"),
+    }
+}
+
+fn slides_of(app: &SlideApp) -> usize {
+    app.session.active().map(|d| d.doc.slides.len()).unwrap_or(0)
+}
+
 #[test]
 fn create_with_nothing_keeps_the_dialog() {
     let mut app = SlideApp::new(Session::with_new(), Services::default());
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index ea2d0229..dbd2db3d 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -234,13 +234,24 @@ fn big(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, id: &str, p: Va
     }
 }
 
-/// Like [`big`], with an accesskit name (the painted label can be two lines).
-fn big_labeled(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, access: &str, id: &str, p: Value) {
-    let en = enabled(app, id);
-    let resp = big_button(ui, icon, label, en).on_hover_text(tip(id, access));
-    resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, en, access));
-    if resp.clicked() {
-        run(app, id, p);
+/// Photo Album is a split button: the main click starts a new album, the arrow edits one.
+fn photo_album_button(app: &mut SlideApp, ui: &mut Ui) {
+    let en = enabled(app, "insert.photoAlbum");
+    let (main, arrow) = big_button_ex(ui, Icon::Picture, "Photo\nAlbum", en, true, false);
+    let _ = main.clone().on_hover_text(tip("insert.photoAlbum", "Photo Album…"));
+    main.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, en, "Photo Album…"));
+    if let Some(a) = &arrow {
+        let _ = a.clone().on_hover_text("Photo Album options");
+        a.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, en, "Photo Album options"));
+    }
+    if main.clicked() {
+        run(app, "insert.photoAlbum", json!({}));
+    }
+    if let Some(a) = arrow {
+        egui::Popup::menu(&a).show(|ui| {
+            menu_item(app, ui, Icon::Picture, "New Photo Album…", "insert.photoAlbum", json!({}));
+            menu_item(app, ui, Icon::Picture, "Edit Photo Album…", "insert.photoAlbumEdit", json!({}));
+        });
     }
 }
 
@@ -1041,7 +1052,7 @@ fn insert(app: &mut SlideApp, ui: &mut Ui) {
     });
     group(ui, |ui| {
         big(app, ui, Icon::Picture, "Pictures", "app.insertPictureDialog", json!({}));
-        big_labeled(app, ui, Icon::Picture, "Photo\nAlbum", "Photo Album…", "insert.photoAlbum", json!({}));
+        photo_album_button(app, ui);
         let r = big_button(ui, Icon::Screenshot, "Screenshot", false);
         let _ = r.on_hover_text("Screenshot (not available yet)");
     });
diff --git a/docs/architecture.md b/docs/architecture.md
index 306a6ed0..b252187f 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog, `insert.photoAlbum`; 227 commands, 28 dialogs; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Edit Photo Album, `insert.photoAlbumEdit`; 228 commands, 28 dialogs; previous: trivial, Photo Album dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -20,7 +20,7 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (228 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
 | L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
@@ -78,6 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
-| 2026-10-14 | trivial | Photo Album dialog and `insert.photoAlbum` (227 commands, 28 dialogs) |
+| 2026-10-14 | trivial | Edit Photo Album (`insert.photoAlbumEdit`) reopens the Photo Album dialog and re-flows those slides (228 commands, 28 dialogs) |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index bfacb0ab..a3881b4c 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album is one of 28 dialogs; Font, Bullets, Find, Replace Fonts, Action Settings, Print and Insert Object remain; previous: minor, 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Edit Photo Album reuses the Photo Album dialog, still 28; Font, Bullets, Find, Replace Fonts, Action Settings, Print and Insert Object remain; previous: trivial, Photo Album counted) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,7 +203,7 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Photo Album is one of them). Still missing Font,
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Photo Album is one of them; Edit Photo Album reopens it). Still missing Font,
   Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object…. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
@@ -256,7 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
-| 2026-10-14 | trivial | Photo Album dialog counted (28 vs ~60). Font, Bullets, Find, Replace Fonts, Action Settings, Print and Insert Object remain |
+| 2026-10-14 | trivial | Edit Photo Album reuses the Photo Album dialog (still 28 vs ~60). Font, Bullets, Find, Replace Fonts, Action Settings, Print and Insert Object remain |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 5004423a..7e5fa0ef 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (automation 227 commands; breadth stays 79%, ready ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (automation 228 commands; breadth stays 79%, ready ~55%; previous: trivial, automation 227 commands) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -239,7 +239,7 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
+- **Automation:** 228 commands, every one reachable from `deckcraft-cli`, the JSON control channel
   and MCP.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
@@ -276,7 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
-| 2026-10-14 | trivial | Working today: 227 commands. Breadth stays 79%, ready ~55%. The d556ff9 snapshot (226 commands, 27 dialogs) is unchanged |
+| 2026-10-14 | trivial | Working today: 228 commands. Breadth stays 79%, ready ~55%. The d556ff9 snapshot (226 commands, 27 dialogs) is unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index d3b62fd0..89f17a7f 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog; 28 dialogs; breadth stays 79%, UI ~60%; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Edit Photo Album reuses the Photo Album dialog; 28 dialogs; breadth stays 79%, UI ~60%; previous: trivial, Photo Album dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Photo Album, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Photo Album, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Photo Album, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Photo Album (Edit Photo Album reopens this dialog), Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -148,7 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
-| 2026-10-14 | trivial | Photo Album dialog (28 dialogs). Breadth stays 79%, UI ~60% |
+| 2026-10-14 | trivial | Edit Photo Album reuses the Photo Album dialog (28 dialogs). Breadth stays 79%, UI ~60% |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 3960ea47cd8f82dd608e98b197dc0f61bd8ff5f1 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:19:16 +0300
Subject: [PATCH 262/376] Charts: 100 % stacked axes count in percent; linked
 axis formats come from the data

---
 crates/model/src/chart.rs      | 17 ++++++++++++++++-
 crates/pptx/src/read/chart.rs  | 31 ++++++++++++++++++++++++++++++-
 crates/pptx/src/write/chart.rs |  5 ++++-
 3 files changed, 50 insertions(+), 3 deletions(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index aebee497..b19ca11c 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -314,7 +314,12 @@ impl Chart {
     /// A value axis label in the axis' number format and the chart's language.
     pub fn axis_label(&self, secondary: bool, v: f64) -> String {
         let code = if secondary { &self.y2_format } else { &self.y_format };
-        crate::numfmt::format(code.as_deref().unwrap_or("General"), v, self.lang.as_deref())
+        // A 100 % stacked chart's value axis counts in percent unless the file says otherwise.
+        let code = match code.as_deref() {
+            None | Some("General") if !secondary && self.kind.percent() => "0%",
+            c => c.unwrap_or("General"),
+        };
+        crate::numfmt::format(code, v, self.lang.as_deref())
     }
 
     /// A data label of series `s`: its number format, else its axis', in the chart's language.
@@ -480,6 +485,16 @@ mod tests {
         assert_eq!(c.data_label(&c.series[1], 0.0), "- ₽");
     }
 
+    #[test]
+    fn full_percent_axes_count_in_percent() {
+        let mut c = Chart::sample(ChartType::PercentColumn);
+        assert_eq!(c.axis_label(false, 0.5), "50%");
+        c.y_format = Some("0.0%".into());
+        assert_eq!(c.axis_label(false, 0.5), "50.0%");
+        let c = Chart::sample(ChartType::Column);
+        assert_eq!(c.axis_label(false, 0.5), "0.5");
+    }
+
     #[test]
     fn combo_axis_ranges() {
         // Spend in columns on the primary axis, clicks as a line on the secondary one.
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 6d7541ff..3e6c6399 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -249,7 +249,22 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
     let by_id = |id: &Option<String>| pa.children_named("valAx").find(|a| id.is_some() && a.child_val("axId") == id.as_deref());
     let val_ax = by_id(&primary_val).or_else(|| pa.children_named("valAx").find(vertical)).or_else(|| pa.children_named("valAx").last());
     let num = |a: &El, k: &str| a.child_val(k).and_then(|v| v.parse::<f64>().ok()).filter(|v| v.is_finite());
-    let format_code = |a: &El| a.child("numFmt").and_then(|n| n.attr("formatCode")).map(str::to_string);
+    // An axis' number format: its own unless linked to the source (`sourceLinked="1"`, or no
+    // c:numFmt at all), in which case the data's format of the first series plotted on it.
+    let source_format = |ax: &El| {
+        let id = ax.child_val("axId");
+        pa.elements()
+            .filter(|g| g.children_named("axId").any(|a| a.attr("val") == id))
+            .flat_map(|g| g.children_named("ser"))
+            .find_map(|s| {
+                s.child("val").or_else(|| s.child("yVal")).and_then(|v| v.find("numCache")).and_then(|c| c.child("formatCode")).map(|f| f.text())
+            })
+            .filter(|f| !f.is_empty() && f != "General")
+    };
+    let format_code = |a: &El| match a.child("numFmt") {
+        Some(n) if n.attr("sourceLinked") != Some("1") => n.attr("formatCode").map(str::to_string),
+        n => source_format(a).or_else(|| n.and_then(|n| n.attr("formatCode")).map(str::to_string)),
+    };
     let deleted = |a: &El| a.child("delete").and_then(|d| d.bool("val")) == Some(true);
     if c.kind == ChartType::Combo && c.series.iter().any(|s| s.secondary_axis) {
         let primary_id = val_ax.and_then(|a| a.child_val("axId"));
@@ -363,6 +378,20 @@ mod tests {
         assert!(c.series.iter().all(|s| !s.secondary_axis));
     }
 
+    #[test]
+    fn linked_axis_formats_come_from_the_data() {
+        // No c:numFmt on the value axis, or a source-linked one: the series' own format.
+        let xml = |ax_fmt: &str| {
+            format!(
+                r#"<c:chartSpace xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><c:chart><c:plotArea><c:barChart><c:barDir val="col"/><c:ser><c:idx val="0"/><c:val><c:numRef><c:numCache><c:formatCode>#,##0</c:formatCode><c:ptCount val="1"/><c:pt idx="0"><c:v>1200</c:v></c:pt></c:numCache></c:numRef></c:val></c:ser><c:axId val="1"/><c:axId val="2"/></c:barChart><c:catAx><c:axId val="1"/></c:catAx><c:valAx><c:axId val="2"/>{ax_fmt}<c:axPos val="l"/></c:valAx></c:plotArea></c:chart></c:chartSpace>"#
+            )
+        };
+        let fmt = |x: &str| read_chart_xml(xml(x).as_bytes()).unwrap().y_format;
+        assert_eq!(fmt("").as_deref(), Some("#,##0"));
+        assert_eq!(fmt(r#"<c:numFmt formatCode="General" sourceLinked="1"/>"#).as_deref(), Some("#,##0"));
+        assert_eq!(fmt(r#"<c:numFmt formatCode="0.0" sourceLinked="0"/>"#).as_deref(), Some("0.0"));
+    }
+
     #[test]
     fn text_sizes_are_read_from_the_file() {
         // PowerPoint's new charts set the axes' and legend's text to 11.97 pt and the title's to
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 76567c9e..dcac10c3 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -289,7 +289,10 @@ fn axes(w: &mut W, c: &Chart, g: Group) {
     if let Some(t) = &c.axis_titles.1 {
         title(w, t);
     }
-    w.empty("c:numFmt", A::new().a("formatCode", if c.kind.percent() { "0%" } else { "General" }).a("sourceLinked", 1));
+    match c.y_format.as_deref().filter(|f| !f.is_empty()) {
+        Some(f) => w.empty("c:numFmt", A::new().a("formatCode", f).a("sourceLinked", 0)),
+        None => w.empty("c:numFmt", A::new().a("formatCode", if c.kind.percent() { "0%" } else { "General" }).a("sourceLinked", 1)),
+    }
     w.val("c:majorTickMark", "none");
     w.val("c:minorTickMark", "none");
     w.val("c:tickLblPos", "nextTo");

From dfee72e74257bbb12f6f0035c34f2d7b46f7f380 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:19:36 +0300
Subject: [PATCH 263/376] Show: play a custom show

---
 ROADMAP.md                      |  2 +
 crates/anim/src/show.rs         | 80 +++++++++++++++++++++++++++++----
 crates/anim/src/tests.rs        | 31 +++++++++++++
 crates/engine/src/cmd/review.rs | 33 +++++++++++++-
 crates/ui-egui/src/control.rs   | 11 ++++-
 crates/ui-egui/src/dialogs.rs   | 25 ++++++++++-
 crates/ui-egui/src/lib.rs       | 28 ++++++++++--
 crates/ui-egui/src/menus.rs     |  4 +-
 crates/ui-egui/src/ribbon.rs    |  8 ++--
 crates/ui-egui/src/show.rs      | 15 +++++--
 docs/control-protocol.md        |  4 +-
 docs/roadmap.md                 |  5 ++-
 docs/slideshow-parity.md        |  7 +--
 docs/target-app-parity.md       |  7 +--
 14 files changed, 225 insertions(+), 35 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index ec5a6ed2..4adde1a7 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | A custom show plays only its slides: Show in the Custom Shows dialog, Set Up Slide Show, or a click action. Breadth stays 79% |
 | 2026-10-14 | Presenter view pauses and resets its timer (T, R) and changes notes size (A-/A+, brackets). The clock shows local time. Second-display placement stays with #433. Breadth stays 79% |
 | 2026-10-14 | See All Slides and zoom during a show: a thumbnail grid (G, or All), click to jump, and click-to-zoom at 2× (Z). Presenter view has Black, White, All slides and Zoom. Breadth stays 79% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
@@ -152,6 +153,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: custom show playback. Breadth stays 79% |
 | 2026-10-14 | trivial | Progress log: presenter timer pause/reset, clock and notes size. Breadth stays 79% |
 | 2026-10-14 | trivial | Progress log: See All Slides and zoom during a show. Breadth stays 79% |
 | 2026-10-13 | trivial | Progress log: wild text cases |
diff --git a/crates/anim/src/show.rs b/crates/anim/src/show.rs
index dbc0a8ae..644eecd6 100644
--- a/crates/anim/src/show.rs
+++ b/crates/anim/src/show.rs
@@ -53,7 +53,7 @@ pub enum LinkJump {
 }
 
 /// Where a slide show is.
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+#[derive(Clone, Debug, PartialEq, Eq, Default)]
 pub struct ShowState {
     /// Index into `presentation.slides`.
     pub slide: usize,
@@ -63,6 +63,10 @@ pub struct ShowState {
     pub playing: bool,
     /// On the end screen.
     pub ended: bool,
+    /// One-shot visit order (Custom Show from the dialog or a click). `None` uses [`show_order`].
+    order: Option<Vec<usize>>,
+    /// Name of the custom show being played, when there is one.
+    custom: Option<String>,
 }
 
 /// Slide indices the show visits in order: the custom show or range from Set Up Slide Show, minus
@@ -83,6 +87,18 @@ pub fn show_order(pres: &Presentation) -> Vec<usize> {
     base.into_iter().filter(|i| pres.slides.get(*i).is_some_and(|s| !s.hidden)).collect()
 }
 
+/// Visible slides of custom show `name`, in that show's order.
+fn custom_indices(pres: &Presentation, name: &str) -> Option<Vec<usize>> {
+    let cs = pres.custom_shows.iter().find(|c| c.name == name)?;
+    let order: Vec<usize> = cs
+        .slides
+        .iter()
+        .filter_map(|id| pres.slides.iter().position(|s| s.id == *id))
+        .filter(|&i| pres.slides.get(i).is_some_and(|s| !s.hidden))
+        .collect();
+    if order.is_empty() { None } else { Some(order) }
+}
+
 fn looping(pres: &Presentation) -> bool {
     pres.show.loop_until_esc || pres.show.show_type == "kiosk"
 }
@@ -104,9 +120,48 @@ impl ShowState {
         } else {
             s.ended = true;
         }
+        if let Some(name) = pres.show.custom_show.clone() {
+            s.custom = Some(name);
+        }
         s
     }
 
+    /// Play custom show `name` from its first slide, without changing Set Up Slide Show.
+    /// `None` when that show is missing or has no visible slides.
+    pub fn play_custom(pres: &Presentation, name: &str) -> Option<ShowState> {
+        let order = custom_indices(pres, name)?;
+        let &first = order.first()?;
+        let mut s = ShowState::start_at(pres, first);
+        s.order = Some(order);
+        s.custom = Some(name.to_string());
+        Some(s)
+    }
+
+    /// Name of the custom show this playback is limited to.
+    pub fn custom_name(&self) -> Option<&str> {
+        self.custom.as_deref().filter(|s| !s.is_empty())
+    }
+
+    /// The slide that follows the current one in this show.
+    pub fn peek_next(&self, pres: &Presentation) -> Option<usize> {
+        self.next_index(pres)
+    }
+
+    pub fn first_index(&self, pres: &Presentation) -> Option<usize> {
+        self.visit(pres).first().copied()
+    }
+
+    pub fn last_index(&self, pres: &Presentation) -> Option<usize> {
+        self.visit(pres).last().copied()
+    }
+
+    fn visit(&self, pres: &Presentation) -> Vec<usize> {
+        match &self.order {
+            Some(order) => order.iter().copied().filter(|&i| pres.slides.get(i).is_some_and(|s| !s.hidden)).collect(),
+            None => show_order(pres),
+        }
+    }
+
     /// The timeline of slide `i`.
     pub fn timeline(pres: &Presentation, i: usize) -> Timeline {
         match pres.slides.get(i) {
@@ -128,7 +183,7 @@ impl ShowState {
     }
 
     fn next_index(&self, pres: &Presentation) -> Option<usize> {
-        let order = show_order(pres);
+        let order = self.visit(pres);
         match order.iter().position(|&i| i == self.slide) {
             Some(p) => order.get(p + 1).copied(),
             None => order.iter().copied().find(|&i| i > self.slide),
@@ -136,7 +191,7 @@ impl ShowState {
     }
 
     fn prev_index(&self, pres: &Presentation) -> Option<usize> {
-        let order = show_order(pres);
+        let order = self.visit(pres);
         match order.iter().position(|&i| i == self.slide) {
             Some(p) => p.checked_sub(1).and_then(|q| order.get(q).copied()),
             None => order.iter().copied().rev().find(|&i| i < self.slide),
@@ -165,7 +220,7 @@ impl ShowState {
                 self.enter(pres, i);
                 ShowAction::Slide(i)
             }
-            None if looping(pres) => match show_order(pres).first() {
+            None if looping(pres) => match self.visit(pres).first() {
                 Some(&i) => {
                     self.enter(pres, i);
                     ShowAction::Slide(i)
@@ -215,7 +270,7 @@ impl ShowState {
         }
         let target = match self.prev_index(pres) {
             Some(i) => Some(i),
-            None if looping(pres) => show_order(pres).last().copied().filter(|&i| i != self.slide),
+            None if looping(pres) => self.visit(pres).last().copied().filter(|&i| i != self.slide),
             None => None,
         };
         match target {
@@ -247,11 +302,18 @@ impl ShowState {
             Action::Slide { slide } => pres.slides.iter().position(|s| s.id == *slide),
             Action::NextSlide => self.next_index(pres),
             Action::PreviousSlide => self.prev_index(pres),
-            Action::FirstSlide => show_order(pres).first().copied(),
-            Action::LastSlide => show_order(pres).last().copied(),
+            Action::FirstSlide => self.visit(pres).first().copied(),
+            Action::LastSlide => self.visit(pres).last().copied(),
             Action::LastViewed => last_viewed,
-            // Custom shows, programs and media actions aren't followed (yet).
-            Action::CustomShow { .. } | Action::Program { .. } | Action::PlayMedia => None,
+            Action::CustomShow { name } => {
+                let Some(order) = custom_indices(pres, name) else { return LinkJump::None };
+                let Some(&i) = order.first() else { return LinkJump::None };
+                self.order = Some(order);
+                self.custom = Some(name.clone());
+                return LinkJump::Show(self.goto(pres, i));
+            }
+            // Programs and media actions aren't followed.
+            Action::Program { .. } | Action::PlayMedia => None,
         };
         match target {
             Some(i) => LinkJump::Show(self.goto(pres, i)),
diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index 1fd82d78..e16f77fd 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -702,6 +702,37 @@ fn show_custom_show_and_range() {
     assert_eq!(show_order(&p), vec![0, 1, 2, 3, 4]);
 }
 
+#[test]
+fn playing_a_custom_show_stays_on_its_slides() {
+    use deckcraft_model::text::Action;
+    let mut p = pres(5);
+    p.custom_shows = vec![CustomShow { name: "Ends".into(), slides: vec![SlideId(1000), SlideId(1004)] }];
+    assert!(p.show.custom_show.is_none());
+    let mut s = ShowState::play_custom(&p, "Ends").expect("the show exists");
+    assert_eq!(s.custom_name(), Some("Ends"));
+    assert_eq!(s.slide, 0);
+    assert_eq!(s.peek_next(&p), Some(4));
+    assert_eq!(s.next(&p), ShowAction::Slide(4));
+    assert_eq!(s.next(&p), ShowAction::End);
+    assert_eq!(s.prev(&p), ShowAction::Slide(4));
+    assert_eq!(s.prev(&p), ShowAction::Slide(0));
+    assert!(ShowState::play_custom(&p, "Missing").is_none());
+    assert!(p.show.custom_show.is_none(), "one-shot playback does not change Set Up");
+
+    Arc::make_mut(&mut p.slides[4]).hidden = true;
+    let only = ShowState::play_custom(&p, "Ends").expect("the visible slide remains");
+    assert_eq!(only.first_index(&p), Some(0));
+    assert_eq!(only.last_index(&p), Some(0));
+
+    let mut s = ShowState::new(&p);
+    p.slides[4] = Arc::new(Slide { id: SlideId(1004), ..Default::default() });
+    assert_eq!(s.follow(&p, &Action::CustomShow { name: "Ends".into() }, None), LinkJump::Show(ShowAction::Slide(0)));
+    assert_eq!(s.custom_name(), Some("Ends"));
+    assert_eq!(s.next(&p), ShowAction::Slide(4));
+    assert_eq!(s.follow(&p, &Action::CustomShow { name: "Missing".into() }, None), LinkJump::None);
+    assert_eq!(s.slide, 4, "an unknown custom show leaves the current slide");
+}
+
 #[test]
 fn show_steps_through_builds() {
     let mut p = pres(2);
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 8e3a532c..7148a169 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -27,7 +27,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Set Up Slide Show…",
             ["Slide Show", "Set Up"],
             None,
-            "{type?: speaker|browsed|kiosk, loop?: bool, noNarration?, noAnimation?, useTimings?, from?, to?}",
+            "{type?: speaker|browsed|kiosk, loop?: bool, noNarration?, noAnimation?, useTimings?, from?, to?, custom?: name}",
             has_doc,
             setup
         ),
@@ -245,6 +245,17 @@ fn setup(s: &mut Session, p: &Value) -> Result<Value> {
             (None, None) if p.get("all").is_some() => sh.range = None,
             _ => {}
         }
+        if p.get("all").and_then(Value::as_bool) == Some(true) {
+            sh.range = None;
+            sh.custom_show = None;
+        }
+        if p.get("custom").is_some() {
+            let name = p.get("custom").and_then(Value::as_str).unwrap_or("");
+            sh.custom_show = if name.is_empty() { None } else { Some(name.to_string()) };
+            if sh.custom_show.is_some() {
+                sh.range = None;
+            }
+        }
         Ok(serde_json::to_value(&*sh).unwrap_or_default())
     })
 }
@@ -264,3 +275,23 @@ fn custom_show(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     ok()
 }
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used)]
+
+    use super::*;
+
+    #[test]
+    fn setup_remembers_a_custom_show() {
+        let mut s = Session::with_new();
+        s.execute("slide.new", &json!({})).unwrap();
+        s.execute("slide.new", &json!({})).unwrap();
+        s.execute("show.customShow", &json!({"name": "Short", "slides": [0, 1]})).unwrap();
+        let v = s.execute("show.setup", &json!({"custom": "Short"})).unwrap();
+        assert_eq!(v.get("customShow").and_then(Value::as_str), Some("Short"));
+        assert!(s.active().unwrap().doc.show.range.is_none());
+        s.execute("show.setup", &json!({"custom": ""})).unwrap();
+        assert!(s.active().unwrap().doc.show.custom_show.is_none());
+    }
+}
diff --git a/crates/ui-egui/src/control.rs b/crates/ui-egui/src/control.rs
index c7e7fc4e..e0cf76df 100644
--- a/crates/ui-egui/src/control.rs
+++ b/crates/ui-egui/src/control.rs
@@ -300,8 +300,15 @@ pub fn handle(app: &mut SlideApp, ctx: &egui::Context, req: &ControlRequest) ->
             ok(Value::Null)
         }
         "show.start" => {
-            let from = p.get("from").and_then(Value::as_u64).unwrap_or(0) as usize;
-            app.start_show(from, p.get("reading").and_then(Value::as_bool).unwrap_or(false));
+            let reading = p.get("reading").and_then(Value::as_bool).unwrap_or(false);
+            if let Some(name) = p.get("custom").and_then(Value::as_str).filter(|s| !s.is_empty()) {
+                app.start_custom_show(name, reading);
+            } else if p.get("from").is_some() {
+                let from = p.get("from").and_then(Value::as_u64).unwrap_or(0) as usize;
+                app.start_show(from, reading);
+            } else {
+                app.start_show(app.show_start_index(), reading);
+            }
             ok(Value::Null)
         }
         "show.end" => {
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..12d72ba9 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -247,10 +247,25 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             let nn = check(ui, d, "Show without narration", "nn", sh.without_narration);
             let na = check(ui, d, "Show without animation", "na", sh.without_animation);
             let ut = check(ui, d, "Use timings, if present", "ut", sh.use_timings);
+            let names: Vec<String> = app.session.active().map(|s| s.doc.custom_shows.iter().map(|c| c.name.clone()).collect()).unwrap_or_default();
+            let chosen = d.fields.entry("custom".into()).or_insert_with(|| sh.custom_show.clone().unwrap_or_default()).clone();
+            ui.label("Slides");
+            let label = if chosen.is_empty() { "All slides".to_string() } else { chosen.clone() };
+            egui::ComboBox::from_id_salt("setup_custom").selected_text(label).show_ui(ui, |ui| {
+                if ui.selectable_label(chosen.is_empty(), "All slides").clicked() {
+                    d.fields.insert("custom".into(), String::new());
+                }
+                for n in &names {
+                    if ui.selectable_label(&chosen == n, n).clicked() {
+                        d.fields.insert("custom".into(), n.clone());
+                    }
+                }
+            });
             let (ok, cancel) = buttons(ui, "OK");
             if ok {
                 let ty = d.get("type", "speaker");
-                run(app, "show.setup", json!({"type": ty, "loop": lp, "noNarration": nn, "noAnimation": na, "useTimings": ut}));
+                let custom = d.fields.get("custom").cloned().unwrap_or_default();
+                run(app, "show.setup", json!({"type": ty, "loop": lp, "noNarration": nn, "noAnimation": na, "useTimings": ut, "custom": custom}));
             }
             ok || cancel
         }
@@ -575,14 +590,22 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
         }
         "customShow" => {
             let shows = app.session.active().map(|s| s.doc.custom_shows.clone()).unwrap_or_default();
+            let mut started = false;
             for s in &shows {
                 ui.horizontal(|ui| {
                     ui.label(format!("{} ({} slides)", s.name, s.slides.len()));
+                    if ui.small_button("Show").clicked() {
+                        run(app, "show.start", json!({"custom": s.name}));
+                        started = true;
+                    }
                     if ui.small_button("Delete").clicked() {
                         let _ = app.run("show.customShow", json!({"name": s.name, "delete": true}));
                     }
                 });
             }
+            if started {
+                return true;
+            }
             field(ui, d, "New show name:", "name", "Custom Show 1");
             field(ui, d, "Slides (e.g. 1,3,5):", "slides", "1");
             let (ok, cancel) = buttons(ui, "Create");
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..9b4ae09c 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -151,7 +151,7 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("view.collapseRibbon", "Collapse the Ribbon", Some("Cmd+F1"), "{}"),
     ("view.dark", "Dark Mode", None, "{on?: bool}"),
     ("view.grayscale", "Grayscale", None, "{on?: bool}"),
-    ("show.start", "Slide Show", Some("F5"), "{from?: index}"),
+    ("show.start", "Slide Show", Some("F5"), "{from?: index, custom?: name}"),
     ("show.presenter", "Presenter View", None, "{on?: bool}"),
     ("show.end", "End Show", None, "{}"),
     ("app.home", "Home", None, "{on?}"),
@@ -494,8 +494,14 @@ impl SlideApp {
             }
             "view.grayscale" => self.ui.grayscale = self.flag(p, self.ui.grayscale),
             "show.start" => {
-                let from = p.get("from").and_then(Value::as_u64).map(|v| v as usize).unwrap_or(0);
-                self.start_show(from, false);
+                if let Some(name) = p.get("custom").and_then(Value::as_str).filter(|s| !s.is_empty()) {
+                    self.start_custom_show(name, false);
+                } else if p.get("from").is_some() {
+                    let from = p.get("from").and_then(Value::as_u64).map(|v| v as usize).unwrap_or(0);
+                    self.start_show(from, false);
+                } else {
+                    self.start_show(self.show_start_index(), false);
+                }
             }
             "show.presenter" => self.ui.presenter_view = self.flag(p, self.ui.presenter_view),
             "show.end" => {
@@ -554,6 +560,11 @@ impl SlideApp {
         Ok(Value::Null)
     }
 
+    /// First slide Play from Start should open: the custom show or range, skipping hidden slides.
+    pub fn show_start_index(&self) -> usize {
+        self.session.active().and_then(|d| deckcraft_anim::show_order(&d.doc).first().copied()).unwrap_or(0)
+    }
+
     pub fn start_show(&mut self, from: usize, reading: bool) {
         self.media.stop_owned(media::Owner::Editor);
         if let Some(d) = self.session.active() {
@@ -561,6 +572,17 @@ impl SlideApp {
         }
     }
 
+    /// Play custom show `name` from its first slide. Set Up Slide Show is left as it was.
+    pub fn start_custom_show(&mut self, name: &str, reading: bool) {
+        let state = self.session.active().and_then(|d| deckcraft_anim::ShowState::play_custom(&d.doc, name));
+        let Some(state) = state else { return };
+        let from = state.slide;
+        self.start_show(from, reading);
+        if let Some(show) = self.show.as_mut() {
+            show.state = state;
+        }
+    }
+
     fn pick_and_open(&mut self) {
         if let Some(pick) = self.services.pick_open.as_mut() {
             if let Some(path) = pick("open") {
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..2a254cbb 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -12,7 +12,7 @@ pub fn ui_shortcut(app: &mut SlideApp, key: egui::Key, m: Mods) -> bool {
     use egui::Key::*;
     let id = match (key, m.cmd, m.shift, m.alt) {
         (F5, _, false, _) => {
-            app.start_show(0, false);
+            app.start_show(app.show_start_index(), false);
             return true;
         }
         (F5, _, true, _) | (Enter, true, false, false) => {
@@ -21,7 +21,7 @@ pub fn ui_shortcut(app: &mut SlideApp, key: egui::Key, m: Mods) -> bool {
             return true;
         }
         (Enter, true, true, _) => {
-            app.start_show(0, false);
+            app.start_show(app.show_start_index(), false);
             return true;
         }
         (S, true, false, false) => {
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..3c1c9611 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -60,7 +60,7 @@ pub fn title_bar(app: &mut SlideApp, ui: &mut Ui) {
             run(app, "edit.redo", json!({}));
         }
         if icon_toggle(&mut child, Icon::PlayFromStart, "Play from Start (F5)", has_doc, false).clicked() {
-            app.start_show(0, false);
+            app.start_show(app.show_start_index(), false);
         }
         let title =
             app.session.active().map(|d| format!("{}{}", d.title(), if dirty { " — Edited" } else { "" })).unwrap_or_else(|| "DeckCraft".into());
@@ -1707,7 +1707,7 @@ pub fn paint_anim_tile(p: &egui::Painter, r: Rect, label: &str, class: AnimClass
 fn slide_show(app: &mut SlideApp, ui: &mut Ui) {
     group(ui, |ui| {
         if big_button(ui, Icon::PlayFromStart, "Play from\nStart", true).clicked() {
-            app.start_show(0, false);
+            app.start_show(app.show_start_index(), false);
         }
         if big_button(ui, Icon::PlayFromCurrent, "Play from\nCurrent Slide", true).clicked() {
             let i = app.session.active().map(|d| d.selection.slide).unwrap_or(0);
@@ -1728,7 +1728,7 @@ fn slide_show(app: &mut SlideApp, ui: &mut Ui) {
     });
     group(ui, |ui| {
         if big_button(ui, Icon::RehearseTimings, "Rehearse\nTimings", true).clicked() {
-            app.start_show(0, false);
+            app.start_show(app.show_start_index(), false);
             if let Some(s) = app.show.as_mut() {
                 s.rehearse = true;
             }
@@ -1757,7 +1757,7 @@ fn record(app: &mut SlideApp, ui: &mut Ui) {
         let r = big_button(ui, Icon::Cameo, "Cameo", false);
         let _ = r.on_hover_text("Camera capture is not available yet");
         if big_button(ui, Icon::PlayFromStart, "From\nBeginning", true).clicked() {
-            app.start_show(0, false);
+            app.start_show(app.show_start_index(), false);
             if let Some(s) = app.show.as_mut() {
                 s.rehearse = true;
             }
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 51a84c4f..6b472c9d 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -338,8 +338,16 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             }
             P if m.command => show.pen = !show.pen,
             A if m.command => show.pen = false,
-            Home => actions.push(show.state.goto(&doc, 0)),
-            End => actions.push(show.state.goto(&doc, doc.slides.len().saturating_sub(1))),
+            Home => {
+                if let Some(i) = show.state.first_index(&doc) {
+                    actions.push(show.state.goto(&doc, i));
+                }
+            }
+            End => {
+                if let Some(i) = show.state.last_index(&doc) {
+                    actions.push(show.state.goto(&doc, i));
+                }
+            }
             B | Period => toggle_blank(&mut show, Color32::BLACK),
             W | Comma => toggle_blank(&mut show, Color32::WHITE),
             E => show.strokes.clear(),
@@ -928,6 +936,7 @@ impl Show {
             "presenterPaused": self.timer.paused(),
             "presenterSecs": self.timer.elapsed(now),
             "notesPx": self.notes_px,
+            "custom": self.state.custom_name(),
         });
         if self.grid {
             let slides = grid_indices(n_slides);
@@ -1233,7 +1242,7 @@ fn render_thumb(ctx: &egui::Context, show: &mut Show, doc: &Presentation, i: usi
 
 fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, now: f64, keep: &mut bool) {
     let cur = show.state.slide;
-    let next = deckcraft_anim::show_order(doc).into_iter().find(|i| *i > cur);
+    let next = show.state.peek_next(doc);
     let cur_tex = show.tex.as_ref().map(|(_, t)| t.clone());
     if let Some(n) = next
         && show.next_tex.as_ref().is_none_or(|(k, _)| *k != n)
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index a20fd991..9d06bf91 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -15,7 +15,7 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `engine.execute` / `ui.menu.invoke` / `command` | `{command, params}` | Run any command (see `engine.commands`; `deckcraft-cli describe ID` documents one) |
 | `engine.commands` | — | Every command: id, label, menu path, shortcut, params doc, enabled / disabled reason |
 | `document.inspect` | — | Slides, sections, layouts, shapes, selection |
-| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state (`grid`, `zoomArm`, `zoom`, `blank`, `presenterPaused`, `presenterSecs`, `notesPx`; `cells` while See All Slides is open), documents, perf (fps, render ms) |
+| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state (`grid`, `zoomArm`, `zoom`, `blank`, `presenterPaused`, `presenterSecs`, `notesPx`, `custom`; `cells` while See All Slides is open), documents, perf (fps, render ms) |
 | `ui.tool.select` | `{tool, preset?}` | `select`, `text`, `shape` + preset, any preset name, `curve`, `freeform`, `scribble`, `pen`, `highlighter`, `eraser` |
 | `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
 | `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show: G is See All Slides, Z arms zoom, T pauses the presenter timer, R resets it, `[` and `]` change notes size, Esc closes the grid and zoom before it leaves the show) |
@@ -26,7 +26,7 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `ui.screenshot` | `{path?}` | PNG of the whole window (base64 when no path) |
 | `ui.render` | `{path?, slide?, scale?}` | Render a slide headlessly |
 | `ui.resize` / `ui.focus` | | Window control |
-| `show.start` / `show.end` | `{from?: slide index, presenter?, reading?}` | Slide show |
+| `show.start` / `show.end` | `{from?: slide index, custom?: name, reading?}` | Slide show. `custom` plays that custom show from its first slide and does not change Set Up. With no `from` and no `custom`, playback starts at the first slide of the show order |
 | `app.open` / `app.save` / `app.export` / `app.quit` | `{path, …}` | Files (export takes the `file.export` params, e.g. `{"path": "deck.pdf", "layout": "handouts", "perPage": 3}`) |
 
 The MCP server (`deckcraft-cli mcp`, see [mcp.md](mcp.md)) wraps the same methods for Claude
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 02db563b..786f1b65 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (presenter timer pause/reset, clock and notes size; previous: trivial, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (custom show playback; previous: trivial, presenter timer) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -17,7 +17,7 @@ points and lead the beta plan.
 |---|---|---|---|
 | Build a deck from scratch (theme, layouts, titles and bullets, shapes, pictures from file), save, close and reopen it | yes | Commands for all of it; `.deckcraft` and `.pptx` round-trip tests (`crates/pptx/tests/roundtrip.rs`, `crates/format`); AutoRecover. Close discards edits without asking (#60, PR #75); image *paste* fails on Windows/Linux (#53), though insert-from-file works | 1–3 |
 | Open a colleague's `.pptx`, edit it, save it back as `.pptx` that PowerPoint opens | partial (not blocking) | The reader is lenient and keeps unknown objects. Files open in PowerPoint without repair (checked 2026-10-06). But only generated decks have been tested; text inside EMF/WMF pictures is missing; comment threads, media options and rewind are lost (#70, #74, #77) | 31–55 |
-| Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window, See All Slides and zoom. The presenter timer pauses and resets, and notes have a size control. Presenter view isn't placed on the second display automatically (drag it there; #433) | 2–4 |
+| Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window, See All Slides and zoom. The presenter timer pauses and resets, and notes have a size control. A custom show plays only its slides. Presenter view isn't placed on the second display automatically (drag it there; #433) | 2–4 |
 | Add business content: tables, charts with their data, simple diagrams | partial (not blocking) | Tables with styles, merge/split, all D or P. Charts insert with the common types and edit data in the Chart Data dialog (P0 partial); SmartArt is basic (pre-drawn shapes) | 12–20 |
 | Share the deck: PDF of slides, notes or handouts; images | yes | `file.export` PDF with text layer, links, bookmarks, handouts 1–9; PNG/JPEG. Artwork is raster in the PDF; no direct print (print the PDF) | 10–16 |
 | Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft`; threads are flattened on `.pptx` save (#70); spelling is a small built-in list | 4–8 |
@@ -109,6 +109,7 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Present workflow notes custom show playback |
 | 2026-10-14 | trivial | Present workflow notes presenter timer pause/reset, clock and notes size. Display placement stays open |
 | 2026-10-14 | trivial | Present workflow notes See All Slides and zoom |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index 582aac8d..de5ad1ec 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (presenter timer pause/reset, clock and notes size; previous: minor, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (custom show playback; previous: minor, presenter timer pause/reset) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -19,7 +19,7 @@ ready** (estimated), **10–16 h** to parity.
 | End screen, Esc to leave | yes | yes | |
 | Step clock: a click after a long pause plays its step (#11) | yes | yes | |
 | Hidden slides skipped | yes | yes | |
-| Hyperlinks and action settings followed (slides, web, mail, End Show, Last Viewed) | yes | yes | Only `http(s)` and `mailto` open outside the show, by design (`safe_url`) |
+| Hyperlinks and action settings followed (slides, web, mail, End Show, Last Viewed, Custom Show) | yes | yes | Only `http(s)` and `mailto` open outside the show, by design (`safe_url`). A Custom Show action plays that show |
 | Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable |
 | Animated GIFs play; pause from their corner button | yes | yes (#39) | |
 | See All Slides grid during the show | yes | yes: G, or All on the show bar and in presenter view; click a thumbnail, Esc closes the grid | Hidden slides are labelled; the first 48 slides are shown |
@@ -27,7 +27,7 @@ ready** (estimated), **10–16 h** to parity.
 | Pen and highlighter ink | yes | pen only (Cmd+P pen, Cmd+A arrow, E erases all ink) | No highlighter, per-stroke eraser, ink colours, or keep/discard annotations prompt |
 | Laser pointer | yes | **no** | 1–2 h |
 | Subtitles and live captions | yes (cloud speech) | no | AI dimension |
-| Custom shows | yes | yes | |
+| Custom shows | yes | yes: Show plays that list in order and does not change Set Up; Set Up Slide Show can keep one for Play from Start | Hidden slides in the list are skipped |
 | Set Up Show: loop until Esc, kiosk (browsed at a kiosk), show without animation/narration, pen colour, slides range | yes | yes, most options | |
 | Use rehearsed timings | yes | yes | |
 
@@ -72,6 +72,7 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | A custom show plays only its slides, from the Custom Shows dialog, from Set Up Slide Show, or from a click action. Checklist breadth stays 66% |
 | 2026-10-14 | minor | Presenter view pauses and resets its timer (T, R) and changes notes size (A-/A+, brackets). The clock shows local time. Second-display placement and swap stay with #433. Checklist breadth stays 66% |
 | 2026-10-14 | minor | See All Slides (G) and click-to-zoom (Z) during the show. Presenter view opens that grid and sets black, white and zoom. Checklist breadth stays 66% |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 1a71823d..7f6540a7 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show lists presenter timer pause/reset, clock and notes size; breadth stays 79%; previous: trivial, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show plays a custom show; breadth stays 79%; previous: trivial, presenter timer) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -229,8 +229,8 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   triggers, by-paragraph builds, Animation Painter, on a shared timeline engine.
 - **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide, See All
   Slides, click-to-zoom, pen, presenter window (black, white, zoom, the slide grid, a timer that
-  pauses and resets, a local clock, and notes size), rehearse timings, custom shows, Set Up Show,
-  Reading View; links and shape actions followed on click.
+  pauses and resets, a local clock, and notes size), rehearse timings, custom shows played on
+  their own, Set Up Show, Reading View; links and shape actions followed on click.
 - **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom;
   grayscale.
 - **Review:** comments with replies and resolve, accessibility checker, a basic spelling list.
@@ -277,6 +277,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Slide show evidence includes custom show playback. Breadth stays 79% |
 | 2026-10-14 | trivial | Slide show evidence includes presenter timer pause/reset, a local clock and notes size. Breadth stays 79% |
 | 2026-10-14 | trivial | Slide show evidence includes See All Slides and zoom. Breadth stays 79% |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |

From fcb5eae1a590e873cd58c8e4db57a0bd2591e491 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:21:30 +0300
Subject: [PATCH 264/376] Startup: fall back to Wayland when DISPLAY names no X
 server

DeckCraft forces X11 whenever DISPLAY is set. A stale DISPLAY (an ended ssh -X session, or
Xwayland turned off) made start-up fail with "failed to open display" while a Wayland
compositor was running. A local DISPLAY whose /tmp/.X11-unix socket is missing now starts on
Wayland when WAYLAND_DISPLAY is set; remote displays and live servers keep X11. Forcing Wayland
without a compositor keeps X11, and with no display at all the error says so plainly.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 apps/deckcraft/src/display.rs | 85 +++++++++++++++++++++++++++++++++++
 apps/deckcraft/src/main.rs    | 15 ++++++-
 2 files changed, 99 insertions(+), 1 deletion(-)
 create mode 100644 apps/deckcraft/src/display.rs

diff --git a/apps/deckcraft/src/display.rs b/apps/deckcraft/src/display.rs
new file mode 100644
index 00000000..2a6eeca2
--- /dev/null
+++ b/apps/deckcraft/src/display.rs
@@ -0,0 +1,85 @@
+//! Which windowing system to start on, on Linux and the BSDs.
+//!
+//! DeckCraft prefers X11 when `DISPLAY` is set (see `main`). A stale `DISPLAY` (left over from
+//! an ended `ssh -X` session or a desktop with Xwayland turned off) used to make start-up fail
+//! with winit's "failed to open display" even though a Wayland compositor was running. When a
+//! local `DISPLAY` names an X server whose socket isn't there and Wayland is available, start on
+//! Wayland instead. With no display at all, say so plainly.
+
+use std::path::Path;
+
+/// The windowing system to ask winit for.
+#[derive(Debug, PartialEq, Eq)]
+pub enum Choice {
+    X11,
+    /// Let winit decide (Wayland when `WAYLAND_DISPLAY` is set).
+    Default,
+    /// Neither `DISPLAY` nor `WAYLAND_DISPLAY`: there is nothing to open a window on.
+    None,
+}
+
+/// The X server number of a local `DISPLAY` (`:1`, `:1.0`, `unix:1`); `None` for a remote one
+/// (`host:10.0`, as `ssh -X` sets) or one we can't read, which are left to X11 itself.
+fn local_display_number(display: &str) -> Option<u32> {
+    let rest = display.strip_prefix(':').or_else(|| display.strip_prefix("unix:"))?;
+    rest.split('.').next()?.parse().ok()
+}
+
+/// Choose from the environment. `socket_exists` checks an X socket path (the filesystem in
+/// [`choose_from_env`], a stub in tests).
+pub fn choose(display: Option<&str>, wayland: Option<&str>, force_wayland: bool, socket_exists: impl Fn(&Path) -> bool) -> Choice {
+    let display = display.filter(|d| !d.is_empty());
+    let wayland = wayland.is_some_and(|w| !w.is_empty());
+    match display {
+        None if wayland => Choice::Default,
+        None => Choice::None,
+        Some(_) if force_wayland && wayland => Choice::Default,
+        Some(d) => match local_display_number(d) {
+            Some(n) if wayland && !socket_exists(&Path::new("/tmp/.X11-unix").join(format!("X{n}"))) => {
+                log::warn!("DISPLAY={d} has no X server; starting on Wayland");
+                Choice::Default
+            }
+            _ => Choice::X11,
+        },
+    }
+}
+
+/// [`choose`] for this process.
+pub fn choose_from_env() -> Choice {
+    let display = std::env::var("DISPLAY").ok();
+    let wayland = std::env::var("WAYLAND_DISPLAY").ok();
+    choose(display.as_deref(), wayland.as_deref(), std::env::var_os("DECKCRAFT_WAYLAND").is_some(), |p| p.exists())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn a_stale_local_display_falls_back_to_wayland() {
+        let none = |_: &Path| false;
+        let all = |_: &Path| true;
+        assert_eq!(choose(Some(":1"), Some("wayland-0"), false, none), Choice::Default);
+        assert_eq!(choose(Some(":1.0"), Some("wayland-0"), false, none), Choice::Default);
+        assert_eq!(choose(Some("unix:0"), Some("wayland-0"), false, none), Choice::Default);
+        // A live X server, no Wayland, or a remote DISPLAY: X11 as before.
+        assert_eq!(choose(Some(":1"), Some("wayland-0"), false, all), Choice::X11);
+        assert_eq!(choose(Some(":1"), None, false, none), Choice::X11);
+        assert_eq!(choose(Some("host:10.0"), Some("wayland-0"), false, none), Choice::X11);
+        // The socket checked is the display's own.
+        assert_eq!(choose(Some(":3"), Some("w"), false, |p: &Path| p.ends_with("X3")), Choice::X11);
+        assert_eq!(choose(Some(":3"), Some("w"), false, |p: &Path| p.ends_with("X0")), Choice::Default);
+    }
+
+    #[test]
+    fn wayland_only_forced_and_no_display_at_all() {
+        let all = |_: &Path| true;
+        assert_eq!(choose(None, Some("wayland-0"), false, all), Choice::Default);
+        assert_eq!(choose(Some(""), Some("wayland-0"), false, all), Choice::Default);
+        assert_eq!(choose(Some(":0"), Some("wayland-0"), true, all), Choice::Default);
+        // Forcing Wayland without a compositor keeps X11 rather than failing.
+        assert_eq!(choose(Some(":0"), None, true, all), Choice::X11);
+        assert_eq!(choose(None, None, false, all), Choice::None);
+        assert_eq!(choose(Some(""), Some(""), false, all), Choice::None);
+    }
+}
diff --git a/apps/deckcraft/src/main.rs b/apps/deckcraft/src/main.rs
index 7b5e48bb..d134923a 100644
--- a/apps/deckcraft/src/main.rs
+++ b/apps/deckcraft/src/main.rs
@@ -14,6 +14,8 @@
 
 mod audio;
 mod control_server;
+#[cfg(all(unix, not(target_os = "macos")))]
+mod display;
 #[cfg(any(target_os = "windows", test))]
 mod graphics;
 mod logging;
@@ -184,7 +186,18 @@ fn main() -> eframe::Result {
         options.viewport = options.viewport.with_icon(icon);
     }
     #[cfg(all(unix, not(target_os = "macos")))]
-    if std::env::var_os("DISPLAY").is_some() && std::env::var_os("DECKCRAFT_WAYLAND").is_none() {
+    let x11 = match display::choose_from_env() {
+        display::Choice::X11 => true,
+        display::Choice::Default => false,
+        display::Choice::None => {
+            // winit's own error says little to someone who started DeckCraft from a console.
+            log::error!("no display: DISPLAY and WAYLAND_DISPLAY are not set");
+            eprintln!("DeckCraft needs a graphical session: neither DISPLAY nor WAYLAND_DISPLAY is set.");
+            false
+        }
+    };
+    #[cfg(all(unix, not(target_os = "macos")))]
+    if x11 {
         options.event_loop_builder = Some(Box::new(|b| {
             use winit::platform::x11::EventLoopBuilderExtX11;
             b.with_x11();

From ed20cebed87b28785c13218078dec0857b7490e8 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:22:19 +0300
Subject: [PATCH 265/376] Charts: scatter and bubble charts get a value x axis

---
 crates/render/src/chart.rs | 52 ++++++++++++++++++++++++++++++++++----
 1 file changed, 47 insertions(+), 5 deletions(-)

diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..7f3515d1 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -86,6 +86,17 @@ fn fmt_num(v: f64) -> String {
     if (v - v.round()).abs() < 1e-9 { format!("{}", v.round() as i64) } else { format!("{v:.1}") }
 }
 
+/// A scatter or bubble chart's value x axis (min, max, major unit): one scale over every series'
+/// x values, from zero when they're all positive. `None` for other charts and when there are no x values.
+fn value_x_scale(c: &Chart, max_intervals: usize) -> Option<(f64, f64, f64)> {
+    if c.series.is_empty() || !c.series.iter().all(|s| matches!(c.series_kind(s), ChartType::Scatter | ChartType::Bubble)) {
+        return None;
+    }
+    let xs = c.series.iter().flat_map(|s| s.x_values.iter().flatten().copied()).filter(|v| v.is_finite());
+    let (lo, hi) = xs.fold(None, |r: Option<(f64, f64)>, v| Some(r.map_or((v, v), |(a, b)| (a.min(v), b.max(v)))))?;
+    Some(axis_scale(lo.min(0.0), hi, None, None, None, max_intervals, false))
+}
+
 /// Where the legend goes for `c:legendPos`, and the plot area left over.
 /// `size` is the legend block (width, height); the result is its top-left corner and the plot area.
 /// `r` (also the OOXML default and the fallback for unknown values) and `l` are vertical stacks centred
@@ -345,9 +356,30 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     }
     let ncat = c.categories.len().max(c.series.iter().map(|s| s.values.len()).max().unwrap_or(0)).max(1);
     let band = if horiz { plot.height() / ncat as f64 } else { plot.width() / ncat as f64 };
+    // Scatter and bubble charts have a value x axis: one scale over every series' x values, with its
+    // own tick labels in place of category names.
+    let xscale = if horiz { None } else { value_x_scale(c, (plot.width() / (base * 2.5)).floor().clamp(2.0, 12.0) as usize) };
+    let to_x = |v: f64| xscale.map(|(lo, hi, _)| plot.x0 + (v - lo) / (hi - lo).max(1e-9) * plot.width());
+    if let Some(sc) = xscale {
+        for v in ticks(sc) {
+            let pos = plot.x0 + (v - sc.0) / (sc.1 - sc.0).max(1e-9) * plot.width();
+            label(
+                ctx,
+                rctx,
+                m,
+                &fmt_num(v),
+                Rect::new(pos - 30.0, plot.y1 + 3.0, pos + 30.0, plot.y1 + base * 1.6),
+                base,
+                Align::Center,
+                Anchor::Top,
+                text_col,
+                false,
+            );
+        }
+    }
     // Category labels: wrapped onto two lines when they don't fit their band (long date ranges).
     let wraps = !horiz && c.categories.iter().any(|n| n.chars().count() as f64 * base * 0.5 > band);
-    for (i, name) in c.categories.iter().enumerate() {
+    for (i, name) in c.categories.iter().enumerate().filter(|_| xscale.is_none()) {
         let mid = if horiz { plot.y0 + band * (i as f64 + 0.5) } else { plot.x0 + band * (i as f64 + 0.5) };
         if horiz {
             label(
@@ -468,10 +500,12 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             };
             let x = match kind {
                 ChartType::Scatter | ChartType::Bubble => {
-                    let xs: Vec<f64> = s.x_values.iter().flatten().copied().collect();
-                    let (xl, xh) = (xs.iter().copied().fold(f64::MAX, f64::min), xs.iter().copied().fold(f64::MIN, f64::max));
-                    let xv = s.x_values.get(i).copied().flatten().unwrap_or(i as f64);
-                    if xh > xl { plot.x0 + (xv - xl) / (xh - xl) * plot.width() } else { plot.x0 + band * (i as f64 + 0.5) }
+                    match (s.x_values.get(i).copied().flatten().and_then(to_x), s.x_values.iter().flatten().next()) {
+                        (Some(x), _) => x,
+                        // No x values at all: the points are numbered 1, 2, 3...
+                        (None, None) => to_x(i as f64 + 1.0).unwrap_or(plot.x0 + band * (i as f64 + 0.5)),
+                        (None, Some(_)) => continue,
+                    }
                 }
                 _ => plot.x0 + band * (i as f64 + 0.5),
             };
@@ -532,6 +566,14 @@ mod tests {
 
     const AREA: Rect = Rect::new(0.0, 0.0, 400.0, 300.0);
 
+    #[test]
+    fn scatter_x_is_a_value_scale_over_all_series() {
+        let mut c = Chart::sample(ChartType::Scatter);
+        c.series[0].x_values = vec![Some(0.5), Some(7.2), None];
+        assert_eq!(value_x_scale(&c, 8), Some((0.0, 8.0, 1.0)));
+        assert_eq!(value_x_scale(&Chart::sample(ChartType::Column), 8), None);
+    }
+
     #[test]
     fn right_legend_is_a_centred_column_and_narrows_the_plot() {
         let (o, plot) = legend_layout("r", (60.0, 100.0), AREA, 10.0, false);

From 8a5eec369f435f7334102c6aa75b75f69acec318 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:22:37 +0300
Subject: [PATCH 266/376] Render: skip laying out table cell text that lands
 wholly off the target

---
 crates/render/src/table.rs | 23 ++++++++++++++++++++++-
 crates/render/src/tests.rs | 24 ++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/crates/render/src/table.rs b/crates/render/src/table.rs
index c84e1172..40024d8e 100644
--- a/crates/render/src/table.rs
+++ b/crates/render/src/table.rs
@@ -297,6 +297,25 @@ pub fn cell_rects(t: &Table, heights: &[f64]) -> Vec<(usize, usize, Rect)> {
     out
 }
 
+/// Can a cell's text be left undrawn because it lands wholly outside the `target` (pixels)? Only
+/// for cells whose text stays inside the cell: its row grew to fit it (one row, horizontal text,
+/// not at the height cap), so nothing overflows. A margin covers italic overhang and the like.
+/// A table of thousands of rows otherwise lays out every cell's text off the slide's bottom.
+fn text_off_target(cell: &Cell, rect: Rect, m: Affine, target: (u16, u16)) -> bool {
+    if cell.row_span > 1 || !matches!(cell.vertical, None | Some(TextDir::Horizontal)) || rect.height() >= 20_000.0 {
+        return false;
+    }
+    let b = m.transform_rect_bbox(rect).inflate(64.0, 64.0);
+    let view = Rect::new(0.0, 0.0, f64::from(target.0), f64::from(target.1));
+    b.is_finite() && (b.x1 < view.x0 || b.y1 < view.y0 || b.x0 > view.x1 || b.y0 > view.y1)
+}
+
+#[cfg(test)]
+thread_local! {
+    /// Cells whose text `draw` laid out on this thread (tests check off-slide cells are skipped).
+    pub(crate) static TEXT_CELLS_DRAWN: std::cell::Cell<usize> = const { std::cell::Cell::new(0) };
+}
+
 /// Draws the table; returns the box its cells cover (table space), which grows with their text.
 #[allow(clippy::too_many_arguments)]
 pub fn draw(
@@ -399,11 +418,13 @@ pub fn draw(
     // Text.
     for (r, c, rect) in &rects {
         let Some(cell) = t.cell(*r, *c) else { continue };
-        if cell.text.is_empty() {
+        if cell.text.is_empty() || text_off_target(cell, *rect, m, (ctx.width(), ctx.height())) {
             continue;
         }
         let body = cell_body(rctx, t, *r, *c, cell);
         let tmp = Shape { text: Some(body.clone()), ..Default::default() };
+        #[cfg(test)]
+        TEXT_CELLS_DRAWN.with(|n| n.set(n.get() + 1));
         crate::draw_text(ctx, rctx, &tmp, &body, *rect, m, fields, None);
         let _ = peniko::Fill::NonZero;
     }
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..01d84ffe 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1711,3 +1711,27 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
     let (w, h) = ink(deckcraft_model::text::TextDir::Vertical);
     assert!(h > w * 3, "vert: stroke on its side {w}x{h}");
 }
+
+#[test]
+fn table_rows_below_the_slide_are_not_laid_out_and_the_slide_looks_the_same() {
+    // A fuzzed deck's 200 x 200 table of long text took 70 s to draw, most of it off the slide.
+    let table = |rows: usize| {
+        let mut t = Table::new(rows, 2, 400.0, 30.0);
+        for r in 0..rows {
+            for c in 0..2 {
+                t.cell_mut(r, c).unwrap().text = TextBody::from_text(&format!("Row {r} col {c}"));
+            }
+        }
+        Shape { id: ShapeId(611), xfrm: Some(Xfrm::new(50.0, 50.0, 400.0, 30.0 * rows as f64)), kind: ShapeKind::Table(t), ..Default::default() }
+    };
+    let opts = RenderOpts { scale: 0.5, ..Default::default() };
+    crate::table::TEXT_CELLS_DRAWN.with(|n| n.set(0));
+    let big = render_slide(&deck_with(vec![table(500)]), 0, &opts);
+    let drawn = crate::table::TEXT_CELLS_DRAWN.with(|n| n.get());
+    assert!(drawn > 2 * 10 && drawn < 2 * 40, "{drawn} cells drawn");
+    // 30 rows already run past the slide's bottom: the same picture.
+    let small = render_slide(&deck_with(vec![table(30)]), 0, &opts);
+    assert_eq!((big.width, big.height), (small.width, small.height));
+    let diff = (0..big.height).flat_map(|y| (0..big.width).map(move |x| (x, y))).filter(|&(x, y)| big.pixel(x, y) != small.pixel(x, y)).count();
+    assert_eq!(diff, 0);
+}

From 2702b48530a17057626472cdc66f5b65b724f41e Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:26:02 +0300
Subject: [PATCH 267/376] Show: show the slide number while typing it

---
 ROADMAP.md                 |  2 +
 crates/ui-egui/src/show.rs | 96 ++++++++++++++++++++++++++++++++++++--
 docs/control-protocol.md   |  4 +-
 docs/roadmap.md            |  5 +-
 docs/slideshow-parity.md   |  5 +-
 docs/target-app-parity.md  |  5 +-
 6 files changed, 104 insertions(+), 13 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 4adde1a7..a333388a 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | During a show, a typed slide number is shown and Enter goes to that slide. Breadth stays 79% |
 | 2026-10-14 | A custom show plays only its slides: Show in the Custom Shows dialog, Set Up Slide Show, or a click action. Breadth stays 79% |
 | 2026-10-14 | Presenter view pauses and resets its timer (T, R) and changes notes size (A-/A+, brackets). The clock shows local time. Second-display placement stays with #433. Breadth stays 79% |
 | 2026-10-14 | See All Slides and zoom during a show: a thumbnail grid (G, or All), click to jump, and click-to-zoom at 2× (Z). Presenter view has Black, White, All slides and Zoom. Breadth stays 79% |
@@ -153,6 +154,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: go to slide shows the typed number. Breadth stays 79% |
 | 2026-10-14 | trivial | Progress log: custom show playback. Breadth stays 79% |
 | 2026-10-14 | trivial | Progress log: presenter timer pause/reset, clock and notes size. Breadth stays 79% |
 | 2026-10-14 | trivial | Progress log: See All Slides and zoom during a show. Breadth stays 79% |
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 6b472c9d..977240c4 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -37,7 +37,9 @@ pub struct Show {
     thumbs: Vec<(usize, TextureHandle)>,
     pen: bool,
     strokes: Vec<Vec<Pos2>>,
+    /// Digits typed for Go to Slide, shown until Enter, Esc, or a short pause.
     goto: String,
+    goto_at: f64,
     started: bool,
     show_start: f64,
     /// Elapsed time in presenter view. Pausing it does not pause the show.
@@ -106,6 +108,7 @@ impl Show {
             pen: false,
             strokes: vec![],
             goto: String::new(),
+            goto_at: 0.0,
             started: false,
             show_start: 0.0,
             timer: PresenterTimer::start(0.0),
@@ -303,7 +306,8 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     for (k, m) in keys {
         use egui::Key::*;
         if matches!(k, Escape | Minus) {
-            if !show.back_out() {
+            let cancelled = k == Escape && show.clear_goto();
+            if !cancelled && !show.back_out() {
                 keep = false;
             }
             continue;
@@ -323,15 +327,21 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
                 }
             }
             Enter => {
-                if let Ok(n) = show.goto.parse::<usize>() {
-                    actions.push(show.state.goto(&doc, n.saturating_sub(1)));
-                    show.goto.clear();
+                if !show.goto.is_empty() {
+                    if let Some(i) = show.take_goto()
+                        && i < doc.slides.len()
+                    {
+                        actions.push(show.state.goto(&doc, i));
+                    }
                 } else if show.ended {
                     keep = false;
                 } else {
                     actions.push(show.state.next(&doc));
                 }
             }
+            Backspace if !show.goto.is_empty() => {
+                show.goto.pop();
+            }
             ArrowLeft | ArrowUp | Backspace | PageUp | P if !(k == P && m.command) => {
                 show.ended = false;
                 actions.push(show.state.prev(&doc));
@@ -358,11 +368,14 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             OpenBracket if plain(m) => show.nudge_notes(-NOTES_STEP),
             CloseBracket if plain(m) => show.nudge_notes(NOTES_STEP),
             Num0 | Num1 | Num2 | Num3 | Num4 | Num5 | Num6 | Num7 | Num8 | Num9 => {
-                show.goto.push_str(k.name());
+                if let Some(d) = k.name().chars().next() {
+                    show.push_slide_number(d, now);
+                }
             }
             _ => {}
         }
     }
+    show.expire_goto(now);
     let on_slide =
         !show.grid && !show.pen && !show.ended && show.blank.is_none() && show.zoom.is_none() && !show.zoom_arm && !show.reading_bar_hit(&ctx);
     let gif_click = if clicked && on_slide { gif_hit(&ctx, ui, &show, &doc, app) } else { None };
@@ -640,6 +653,14 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     if let Some(c) = show.blank {
         painter.rect_filled(full, CornerRadius::ZERO, c);
     }
+    if !show.goto.is_empty() {
+        let label = format!("Go to slide {}", show.goto);
+        let w = (28.0 + label.len() as f32 * 10.0).clamp(160.0, full.width() - 32.0);
+        let r = Rect::from_min_size(pos2(full.min.x + 16.0, full.max.y - 96.0), vec2(w, 36.0));
+        painter.rect_filled(r, CornerRadius::same(6), Color32::from_black_alpha(190));
+        painter.text(r.center(), Align2::CENTER_CENTER, label, theme::font(18.0), Color32::WHITE);
+        ctx.request_repaint_after(std::time::Duration::from_millis(200));
+    }
     // Pen.
     let resp = ui.interact(full, ui.id().with("show_pen"), if show.pen { Sense::drag() } else { Sense::hover() });
     if show.pen {
@@ -917,6 +938,39 @@ impl Show {
         self.zoom.map(|z| (z.nx, z.ny, z.scale))
     }
 
+    fn push_slide_number(&mut self, digit: char, now: f64) {
+        if !digit.is_ascii_digit() || self.goto.len() >= GOTO_DIGITS {
+            return;
+        }
+        self.goto.push(digit);
+        self.goto_at = if now.is_finite() { now } else { 0.0 };
+    }
+
+    /// 1-based slide number, or `None` for 0 or a non-number. The buffer is cleared either way.
+    fn take_goto(&mut self) -> Option<usize> {
+        let raw = std::mem::take(&mut self.goto);
+        raw.parse::<usize>().ok().and_then(|n| n.checked_sub(1))
+    }
+
+    fn expire_goto(&mut self, now: f64) {
+        if self.goto.is_empty() || !now.is_finite() || !self.goto_at.is_finite() {
+            return;
+        }
+        if now - self.goto_at > GOTO_HOLD {
+            self.goto.clear();
+        }
+    }
+
+    /// Esc drops a number in progress. True when it did.
+    fn clear_goto(&mut self) -> bool {
+        if self.goto.is_empty() {
+            false
+        } else {
+            self.goto.clear();
+            true
+        }
+    }
+
     fn nudge_notes(&mut self, delta: f32) {
         let next = self.notes_px + delta;
         if next.is_finite() {
@@ -937,6 +991,7 @@ impl Show {
             "presenterSecs": self.timer.elapsed(now),
             "notesPx": self.notes_px,
             "custom": self.state.custom_name(),
+            "goto": if self.goto.is_empty() { None } else { Some(self.goto.clone()) },
         });
         if self.grid {
             let slides = grid_indices(n_slides);
@@ -956,6 +1011,8 @@ impl Show {
     }
 }
 
+const GOTO_HOLD: f64 = 3.0;
+const GOTO_DIGITS: usize = 4;
 const ZOOM_SCALE: f32 = 2.0;
 const GRID_CAP: usize = 48;
 const TOOL_BAR_W: f32 = 520.0;
@@ -1510,4 +1567,33 @@ mod tests {
         assert_eq!(v["presenterPaused"], json!(false));
         assert_eq!(v["notesPx"], json!(NOTES_MIN));
     }
+
+    #[test]
+    fn a_typed_slide_number_jumps_and_then_expires() {
+        let mut s = deckcraft_engine::Session::with_new();
+        s.execute("slide.new", &json!({})).unwrap();
+        let doc = s.active().unwrap().doc.clone();
+        let mut show = Show::new(&doc, 0, false, false);
+        show.push_slide_number('1', 10.0);
+        show.push_slide_number('2', 10.2);
+        assert_eq!(show.goto, "12");
+        assert_eq!(show.take_goto(), Some(11));
+        assert!(show.goto.is_empty());
+        show.push_slide_number('0', 1.0);
+        assert_eq!(show.take_goto(), None, "slide 0 is not a slide");
+        show.push_slide_number('4', 5.0);
+        show.expire_goto(7.0);
+        assert_eq!(show.goto, "4");
+        show.expire_goto(8.1);
+        assert!(show.goto.is_empty());
+        show.push_slide_number('9', 0.0);
+        assert!(show.clear_goto());
+        assert!(!show.clear_goto());
+        for _ in 0..6 {
+            show.push_slide_number('9', 1.0);
+        }
+        assert_eq!(show.goto.len(), GOTO_DIGITS);
+        show.push_slide_number('a', 1.0);
+        assert!(show.goto.chars().all(|c| c.is_ascii_digit()));
+    }
 }
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index 9d06bf91..75739419 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -15,10 +15,10 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `engine.execute` / `ui.menu.invoke` / `command` | `{command, params}` | Run any command (see `engine.commands`; `deckcraft-cli describe ID` documents one) |
 | `engine.commands` | — | Every command: id, label, menu path, shortcut, params doc, enabled / disabled reason |
 | `document.inspect` | — | Slides, sections, layouts, shapes, selection |
-| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state (`grid`, `zoomArm`, `zoom`, `blank`, `presenterPaused`, `presenterSecs`, `notesPx`, `custom`; `cells` while See All Slides is open), documents, perf (fps, render ms) |
+| `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state (`grid`, `zoomArm`, `zoom`, `blank`, `presenterPaused`, `presenterSecs`, `notesPx`, `custom`, `goto`; `cells` while See All Slides is open), documents, perf (fps, render ms) |
 | `ui.tool.select` | `{tool, preset?}` | `select`, `text`, `shape` + preset, any preset name, `curve`, `freeform`, `scribble`, `pen`, `highlighter`, `eraser` |
 | `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
-| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show: G is See All Slides, Z arms zoom, T pauses the presenter timer, R resets it, `[` and `]` change notes size, Esc closes the grid and zoom before it leaves the show) |
+| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show: digits then Enter go to that slide, G is See All Slides, Z arms zoom, T pauses the presenter timer, R resets it, `[` and `]` change notes size, Esc clears a slide number, the grid and zoom before it leaves the show) |
 | `ui.ime` | `{preedit, active?: [start, end]}` / `{commit}` | An input method's composition through egui, as a real one arrives: shown in place on the slide or in a focused field; `{"preedit": ""}` cancels |
 | `ui.move` / `ui.click` / `ui.drag` | screen points | Real egui pointer input — reaches every widget, menu and pane |
 | `ui.set` | `{tab?, view?, pane?, notes?, zoom?, brightness?, ruler?, gridlines?, guides?, …}` | UI state (returns the full state) |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 786f1b65..8faed8cb 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (custom show playback; previous: trivial, presenter timer) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (go to slide shows the typed number; previous: trivial, custom show playback) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -17,7 +17,7 @@ points and lead the beta plan.
 |---|---|---|---|
 | Build a deck from scratch (theme, layouts, titles and bullets, shapes, pictures from file), save, close and reopen it | yes | Commands for all of it; `.deckcraft` and `.pptx` round-trip tests (`crates/pptx/tests/roundtrip.rs`, `crates/format`); AutoRecover. Close discards edits without asking (#60, PR #75); image *paste* fails on Windows/Linux (#53), though insert-from-file works | 1–3 |
 | Open a colleague's `.pptx`, edit it, save it back as `.pptx` that PowerPoint opens | partial (not blocking) | The reader is lenient and keeps unknown objects. Files open in PowerPoint without repair (checked 2026-10-06). But only generated decks have been tested; text inside EMF/WMF pictures is missing; comment threads, media options and rewind are lost (#70, #74, #77) | 31–55 |
-| Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window, See All Slides and zoom. The presenter timer pauses and resets, and notes have a size control. A custom show plays only its slides. Presenter view isn't placed on the second display automatically (drag it there; #433) | 2–4 |
+| Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window, See All Slides and zoom. The presenter timer pauses and resets, and notes have a size control. A custom show plays only its slides. Typing a slide number during the show shows it, and Enter goes there. Presenter view isn't placed on the second display automatically (drag it there; #433) | 2–4 |
 | Add business content: tables, charts with their data, simple diagrams | partial (not blocking) | Tables with styles, merge/split, all D or P. Charts insert with the common types and edit data in the Chart Data dialog (P0 partial); SmartArt is basic (pre-drawn shapes) | 12–20 |
 | Share the deck: PDF of slides, notes or handouts; images | yes | `file.export` PDF with text layer, links, bookmarks, handouts 1–9; PNG/JPEG. Artwork is raster in the PDF; no direct print (print the PDF) | 10–16 |
 | Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft`; threads are flattened on `.pptx` save (#70); spelling is a small built-in list | 4–8 |
@@ -109,6 +109,7 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Present workflow notes go to slide number entry |
 | 2026-10-14 | trivial | Present workflow notes custom show playback |
 | 2026-10-14 | trivial | Present workflow notes presenter timer pause/reset, clock and notes size. Display placement stays open |
 | 2026-10-14 | trivial | Present workflow notes See All Slides and zoom |
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index de5ad1ec..5b4c2bfd 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (custom show playback; previous: minor, presenter timer pause/reset) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (go to slide shows the number while it is typed; previous: minor, custom show playback) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -14,7 +14,7 @@ ready** (estimated), **10–16 h** to parity.
 |---|---|---|---|
 | Play from Start / from Current Slide (F5, Shift+F5, Cmd+Enter) | yes | yes | |
 | Next/previous by click, arrows, Space, Page Up/Down, Enter, Backspace | yes | yes | #17 reported arrows not working in v0.3.0 AppImage; recheck |
-| Go to slide (number + Enter), first/last | yes | yes | |
+| Go to slide (number + Enter), first/last | yes | yes: the digits show as "Go to slide …" until Enter, Backspace, Esc, or 3 seconds | Slide numbers are 1-based; 0 and a number past the end do not move |
 | Black / white screen (B / W) | yes | yes | |
 | End screen, Esc to leave | yes | yes | |
 | Step clock: a click after a long pause plays its step (#11) | yes | yes | |
@@ -72,6 +72,7 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Typing a slide number during the show shows it, and Enter goes there. Esc clears the number before it leaves the show. Checklist breadth stays 66% |
 | 2026-10-14 | minor | A custom show plays only its slides, from the Custom Shows dialog, from Set Up Slide Show, or from a click action. Checklist breadth stays 66% |
 | 2026-10-14 | minor | Presenter view pauses and resets its timer (T, R) and changes notes size (A-/A+, brackets). The clock shows local time. Second-display placement and swap stay with #433. Checklist breadth stays 66% |
 | 2026-10-14 | minor | See All Slides (G) and click-to-zoom (Z) during the show. Presenter view opens that grid and sets black, white and zoom. Checklist breadth stays 66% |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 7f6540a7..de1b129e 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show plays a custom show; breadth stays 79%; previous: trivial, presenter timer) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (go to slide shows the typed number; breadth stays 79%; previous: trivial, custom show playback) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -227,7 +227,7 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Transitions and animations:** 48 transitions including Morph (objects, words, characters,
   geometry outlines), 64 animation effects (entrance, emphasis, exit, motion paths, media),
   triggers, by-paragraph builds, Animation Painter, on a shared timeline engine.
-- **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide, See All
+- **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide (the typed number is shown), See All
   Slides, click-to-zoom, pen, presenter window (black, white, zoom, the slide grid, a timer that
   pauses and resets, a local clock, and notes size), rehearse timings, custom shows played on
   their own, Set Up Show, Reading View; links and shape actions followed on click.
@@ -277,6 +277,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Slide show evidence includes a visible go-to-slide number. Breadth stays 79% |
 | 2026-10-14 | trivial | Slide show evidence includes custom show playback. Breadth stays 79% |
 | 2026-10-14 | trivial | Slide show evidence includes presenter timer pause/reset, a local clock and notes size. Breadth stays 79% |
 | 2026-10-14 | trivial | Slide show evidence includes See All Slides and zoom. Breadth stays 79% |

From 22074c4c691944777a175d4b487134e2f4df32a6 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:35:13 +0300
Subject: [PATCH 268/376] Format: repair degenerate slide sizes on load
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

repair() brings each slide side into PowerPoint's 72–4032 pt (as Design › Slide Size allows;
it accepted 1–4000 before), and replaces a zero, negative or non-finite size with 16:9; a bad
notes size gets the default. The native reader takes a null, string or missing slide/notes
size as NaN for repair to fix, so such a file opens instead of failing as damaged (NaN and
infinity are saved as null). The canvas fit and slide show fit treat a zero or non-finite side
as 1 pt, so an in-memory bad size can't make layout infinite.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/format/src/lib.rs               | 74 ++++++++++++++++++++++++--
 crates/model/src/lib.rs                | 13 ++++-
 crates/ui-egui/src/canvas.rs           |  4 +-
 crates/ui-egui/src/lib.rs              |  2 +
 crates/ui-egui/src/show.rs             |  6 ++-
 crates/ui-egui/src/slide_size_tests.rs | 58 ++++++++++++++++++++
 6 files changed, 149 insertions(+), 8 deletions(-)
 create mode 100644 crates/ui-egui/src/slide_size_tests.rs

diff --git a/crates/format/src/lib.rs b/crates/format/src/lib.rs
index 1b37a232..965c2140 100644
--- a/crates/format/src/lib.rs
+++ b/crates/format/src/lib.rs
@@ -140,11 +140,24 @@ pub fn repair(p: &mut Presentation) {
             }
         }
     }
-    if !(p.slide_size.width.is_finite() && p.slide_size.width >= 1.0 && p.slide_size.height.is_finite() && p.slide_size.height >= 1.0) {
-        p.slide_size = defaults::WIDE;
+    p.slide_size = sane_slide_size(p.slide_size);
+    // The notes page only lays out notes, but its size divides too.
+    if !(p.notes_size.width.is_finite() && p.notes_size.width > 0.0 && p.notes_size.height.is_finite() && p.notes_size.height > 0.0) {
+        p.notes_size = Presentation::default().notes_size;
     }
-    p.slide_size.width = p.slide_size.width.min(4000.0);
-    p.slide_size.height = p.slide_size.height.min(4000.0);
+}
+
+/// Smallest and largest slide side, in points: PowerPoint's 1–56 in, as Design › Slide Size allows.
+pub const SLIDE_SIDE: std::ops::RangeInclusive<f64> = 72.0..=4032.0;
+
+/// A slide size the views and renderer can always lay out: a missing, zero, negative or
+/// non-finite side gives the 16:9 default, and each side is brought into [`SLIDE_SIDE`].
+pub fn sane_slide_size(s: deckcraft_model::Size) -> deckcraft_model::Size {
+    let ok = |v: f64| v.is_finite() && v > 0.0;
+    if !(ok(s.width) && ok(s.height)) {
+        return defaults::WIDE;
+    }
+    deckcraft_model::Size::new(s.width.clamp(*SLIDE_SIDE.start(), *SLIDE_SIDE.end()), s.height.clamp(*SLIDE_SIDE.start(), *SLIDE_SIDE.end()))
 }
 
 /// Outline text: one slide per unindented line; tab-indented lines become body bullets at their
@@ -241,6 +254,59 @@ mod tests {
         assert!(load(&b).is_err());
     }
 
+    #[test]
+    fn degenerate_slide_sizes_are_repaired() {
+        use deckcraft_model::Size;
+        let cases = [
+            ((0.0, 0.0), (960.0, 540.0)),
+            ((-5.0, 540.0), (960.0, 540.0)),
+            ((f64::NAN, 540.0), (960.0, 540.0)),
+            ((f64::INFINITY, 1.0), (960.0, 540.0)),
+            ((1.0, 1.0), (72.0, 72.0)),
+            ((0.5, 4000.0), (72.0, 4000.0)),
+            ((1e9, 20.0), (4032.0, 72.0)),
+            ((720.0, 540.0), (720.0, 540.0)),
+        ];
+        for ((w, h), want) in cases {
+            let mut p = Presentation { slide_size: Size::new(w, h), notes_size: Size::new(0.0, f64::NAN), ..Default::default() };
+            repair(&mut p);
+            assert_eq!((p.slide_size.width, p.slide_size.height), want, "{w}x{h}");
+            assert_eq!(p.notes_size, Presentation::default().notes_size);
+        }
+    }
+
+    /// A file whose slide size is null, a string or missing a side (written by hand or by
+    /// another tool; NaN is also saved as null) opens with the default size rather than failing
+    /// as damaged.
+    #[test]
+    fn files_with_unreadable_slide_sizes_still_open() {
+        let saved = save(&Presentation::default()).unwrap();
+        let mut z = zip::ZipArchive::new(Cursor::new(&saved[..])).unwrap();
+        let json: serde_json::Value = serde_json::from_slice(&read_entry(&mut z, "presentation.json").unwrap()).unwrap();
+        for size in [
+            serde_json::json!({"width": null, "height": 540}),
+            serde_json::json!({"width": "big", "height": 540}),
+            serde_json::json!({"height": 0}),
+            serde_json::json!(null),
+            serde_json::json!(7),
+        ] {
+            let mut m = json.clone();
+            m["presentation"]["slideSize"] = size.clone();
+            let mut buf = Cursor::new(Vec::new());
+            {
+                let mut w = zip::ZipWriter::new(&mut buf);
+                let o = zip::write::SimpleFileOptions::default();
+                w.start_file("mimetype", o).unwrap();
+                w.write_all(MIMETYPE.as_bytes()).unwrap();
+                w.start_file("presentation.json", o).unwrap();
+                w.write_all(&serde_json::to_vec(&m).unwrap()).unwrap();
+                w.finish().unwrap();
+            }
+            let p = load(buf.get_ref()).unwrap_or_else(|e| panic!("{size}: {e}"));
+            assert_eq!((p.slide_size.width, p.slide_size.height), (960.0, 540.0), "{size}");
+        }
+    }
+
     #[test]
     fn repair_fixes_missing_layout_and_size() {
         let mut p = Presentation::default();
diff --git a/crates/model/src/lib.rs b/crates/model/src/lib.rs
index 43561f94..3ae8e3ae 100644
--- a/crates/model/src/lib.rs
+++ b/crates/model/src/lib.rs
@@ -817,11 +817,22 @@ pub struct MediaItem {
     pub link: Option<String>,
 }
 
+/// A size whose sides may be missing, null or not numbers (NaN then); see `Presentation::slide_size`.
+fn lenient_size<'de, D: serde::Deserializer<'de>>(d: D) -> std::result::Result<Size, D::Error> {
+    let v = serde_json::Value::deserialize(d)?;
+    let side = |k: &str| v.get(k).and_then(serde_json::Value::as_f64).unwrap_or(f64::NAN);
+    Ok(Size::new(side("width"), side("height")))
+}
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "camelCase")]
 pub struct Presentation {
-    /// Slide size in points (default 16:9, 960 × 540).
+    /// Slide size in points (default 16:9, 960 × 540). Read leniently: a missing, null or
+    /// non-numeric side becomes NaN for `deckcraft_format::repair` to replace, instead of the
+    /// whole file failing to open.
+    #[serde(deserialize_with = "lenient_size")]
     pub slide_size: Size,
+    #[serde(deserialize_with = "lenient_size")]
     pub notes_size: Size,
     pub slides: Vec<Arc<Slide>>,
     pub masters: Vec<Arc<Master>>,
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..d8cb6b4e 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -38,7 +38,9 @@ fn mods(ui: &Ui) -> Mods {
 /// The slide's rect on screen for the current zoom.
 pub fn layout(app: &SlideApp, avail: Rect) -> (Rect, f32) {
     let Some(d) = app.session.active() else { return (avail, 1.0) };
-    let (sw, sh) = (d.doc.slide_size.width as f32, d.doc.slide_size.height as f32);
+    // Loaded sizes are repaired; a zero or non-finite side would still make the fit infinite.
+    let side = |v: f64| if v.is_finite() { (v as f32).max(1.0) } else { 1.0 };
+    let (sw, sh) = (side(d.doc.slide_size.width), side(d.doc.slide_size.height));
     let margin = 28.0;
     let fit = ((avail.width() - margin * 2.0) / sw).min((avail.height() - margin * 2.0) / sh).max(0.05);
     let scale = app.ui.zoom.unwrap_or(fit);
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..66dd41c9 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1129,6 +1129,8 @@ fn js_now() -> f64 {
 
 #[cfg(test)]
 mod ime_tests;
+#[cfg(test)]
+mod slide_size_tests;
 
 #[cfg(test)]
 mod tests {
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..5d1c0827 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -201,8 +201,10 @@ fn state_for(tl: &Timeline, id: ShapeId, step: usize, t: f64) -> ShapeState {
 }
 
 fn fit(avail: Rect, doc: &Presentation) -> Rect {
-    let (sw, sh) = (doc.slide_size.width as f32, doc.slide_size.height as f32);
-    let s = (avail.width() / sw).min(avail.height() / sh);
+    // Loaded sizes are repaired, but a zero side here would make every rectangle NaN.
+    let side = |v: f64| if v.is_finite() { (v as f32).max(1.0) } else { 1.0 };
+    let (sw, sh) = (side(doc.slide_size.width), side(doc.slide_size.height));
+    let s = (avail.width() / sw).min(avail.height() / sh).max(0.0);
     Rect::from_center_size(avail.center(), vec2(sw * s, sh * s))
 }
 
diff --git a/crates/ui-egui/src/slide_size_tests.rs b/crates/ui-egui/src/slide_size_tests.rs
new file mode 100644
index 00000000..0ad77994
--- /dev/null
+++ b/crates/ui-egui/src/slide_size_tests.rs
@@ -0,0 +1,58 @@
+//! Slide sizes at the edges of what a loaded file can give (after `deckcraft_format::repair`):
+//! the editor, sorter, slide show and presenter view open without panicking. (NaN and infinity
+//! are saved as null, which used to make the file fail to open.)
+#![allow(clippy::unwrap_used, clippy::expect_used)]
+
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+use deckcraft_engine::Session;
+
+fn open_with_size(w: f64, h: f64) -> egui_kittest::Harness<'static, SlideApp> {
+    // Written with the size, then opened the way File › Open does (load, then repair).
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({})).unwrap();
+    std::sync::Arc::make_mut(&mut s.active_mut().unwrap().doc).slide_size = deckcraft_model::Size::new(w, h);
+    let path = std::env::temp_dir().join(format!("deckcraft-size-{}-{w}x{h}.deckcraft", std::process::id()));
+    s.execute("file.saveAs", &json!({"path": path.to_string_lossy()})).unwrap();
+    let mut s = Session::new();
+    s.execute("file.open", &json!({"path": path.to_string_lossy()})).unwrap();
+    let _ = std::fs::remove_file(&path);
+    egui_kittest::Harness::builder().with_size(egui::vec2(1280.0, 800.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SlideApp::new(s, Services::default()),
+    )
+}
+
+#[test]
+fn extreme_loaded_slide_sizes_open_in_every_view() {
+    for (w, h) in [(0.0, 0.0), (-5.0, 540.0), (f64::NAN, 540.0), (f64::INFINITY, 1.0), (1.0, 1.0), (1e9, 1e9), (4000.0, 4000.0)] {
+        let mut hs = open_with_size(w, h);
+        hs.run_steps(3);
+        let size = hs.state().session.active().unwrap().doc.slide_size;
+        assert!((72.0..=4032.0).contains(&size.width) && (72.0..=4032.0).contains(&size.height), "{w}x{h}: {size:?}");
+        for cmd in ["view.sorter", "view.normal"] {
+            hs.state_mut().run(cmd, json!({})).unwrap();
+            hs.run_steps(2);
+        }
+        hs.state_mut().run("show.presenter", json!({"on": true})).unwrap();
+        hs.state_mut().run("show.start", json!({"from": 0})).unwrap();
+        hs.run_steps(3);
+        assert!(hs.state().show.is_some(), "{w}x{h}");
+    }
+}
+
+/// A presentation whose size went bad in memory (not through a file) still lays out: the
+/// canvas fit stays finite and positive.
+#[test]
+fn the_canvas_fit_survives_a_zero_slide_size_in_memory() {
+    let mut s = Session::with_new();
+    std::sync::Arc::make_mut(&mut s.active_mut().unwrap().doc).slide_size = deckcraft_model::Size::new(0.0, f64::NAN);
+    let app = SlideApp::new(s, Services::default());
+    let (r, scale) = crate::canvas::layout(&app, egui::Rect::from_min_size(egui::Pos2::ZERO, egui::vec2(1000.0, 700.0)));
+    assert!(scale.is_finite() && scale > 0.0, "{scale}");
+    assert!(r.min.x.is_finite() && r.max.y.is_finite(), "{r:?}");
+}

From f0647e1bd83e2d2b25b5ac96174612e24a3dcd1d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:37:49 +0300
Subject: [PATCH 269/376] Review: previous and next comment

Walk every comment in the deck from the Review tab, and list every slide in the Comments pane.
---
 ROADMAP.md                      |   4 +-
 crates/engine/src/cmd/review.rs | 115 +++++++++++++++++++++++++++++++-
 crates/ui-egui/src/lib.rs       |   4 ++
 crates/ui-egui/src/panes.rs     |  82 ++++++++++++++++++-----
 crates/ui-egui/src/ribbon.rs    |  21 ++++++
 docs/architecture.md            |   5 +-
 docs/roadmap.md                 |   5 +-
 docs/target-app-parity.md       |   7 +-
 docs/ui-parity.md               |   5 +-
 9 files changed, 222 insertions(+), 26 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..65c904b9 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: previous and next comment; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Review: Previous and Next comment walk every comment in the deck; the Comments pane lists every slide and highlights the one you landed on |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: previous and next comment |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 8e3a532c..88b4cac6 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -6,7 +6,7 @@ use deckcraft_model::Comment;
 use serde_json::{Value, json};
 
 use super::*;
-use crate::{Result, Session, UiRequest};
+use crate::{Result, Session, Target, UiRequest};
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![
@@ -15,6 +15,24 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("comment.delete", "Delete Comment", ["Review", "Comments"], None, "{index? | all?: bool}", has_slide, delete),
         cmd!("comment.resolve", "Resolve Thread", ["Comments"], None, "{index, resolved?: bool}", has_slide, resolve),
         cmd!(query "comment.list", "Comments", [], None, "{slide?} → comments", has_slide, list),
+        cmd!(
+            noundo "comment.next",
+            "Next Comment",
+            ["Review", "Comments"],
+            None,
+            "{slide?, index?} → {slide, index, text}",
+            has_slide,
+            |s, p| neighbour(s, p, true)
+        ),
+        cmd!(
+            noundo "comment.prev",
+            "Previous Comment",
+            ["Review", "Comments"],
+            None,
+            "{slide?, index?} → {slide, index, text}",
+            has_slide,
+            |s, p| neighbour(s, p, false)
+        ),
         cmd!(query "review.accessibility", "Check Accessibility", ["Review", "Accessibility"], None, "{} → [{slide, shape, issue}]", has_doc, accessibility),
         cmd!(query "review.spelling", "Spelling", ["Review", "Proofing"], Some("F7"), "{} → [{slide, shape, word}] (words not in the built-in list)", has_doc, spelling),
         cmd!(noundo "show.fromStart", "Play from Start", ["Slide Show", "Start Slide Show"], Some("Cmd+Shift+Enter"), "{}", has_slide, |s, _| start(s, 0)),
@@ -123,6 +141,51 @@ fn list(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(serde_json::to_value(st.doc.slides.get(i).map(|x| x.comments.clone()).unwrap_or_default()).unwrap_or_default())
 }
 
+/// Flat `(slide, comment index)` list in deck order.
+fn comment_threads(doc: &deckcraft_model::Presentation) -> Vec<(usize, usize)> {
+    let mut out = Vec::new();
+    for (si, sl) in doc.slides.iter().enumerate() {
+        for ci in 0..sl.comments.len() {
+            out.push((si, ci));
+        }
+    }
+    out
+}
+
+/// Step to the next or previous comment. With `{slide, index}` matching a thread, move one step
+/// and stop at the ends. Without `index`, next is the first thread on or after `slide` (the
+/// current slide when omitted) and previous is the last thread strictly before it.
+fn neighbour(s: &mut Session, p: &Value, forward: bool) -> Result<Value> {
+    let cmd = if forward { "comment.next" } else { "comment.prev" };
+    let (threads, slide, index) = {
+        let st = s.doc()?;
+        (comment_threads(&st.doc), usize_param(p, "slide").unwrap_or(st.selection.slide), usize_param(p, "index"))
+    };
+    if threads.is_empty() {
+        return Err(bad(cmd, "no comments"));
+    }
+    let pos = index.and_then(|i| threads.iter().position(|&(sl, c)| sl == slide && c == i));
+    let target = match (pos, forward) {
+        (Some(i), true) => threads.get(i + 1).copied(),
+        (Some(i), false) => i.checked_sub(1).and_then(|j| threads.get(j).copied()),
+        (None, true) => threads.iter().copied().find(|(sl, _)| *sl >= slide),
+        (None, false) => threads.iter().copied().rev().find(|(sl, _)| *sl < slide),
+    };
+    let Some((slide, index)) = target else {
+        return Err(bad(cmd, "no more comments"));
+    };
+    s.select(|doc, sel| {
+        sel.slide = slide;
+        sel.slides = doc.slides.get(slide).map(|x| vec![x.id]).unwrap_or_default();
+        sel.shapes.clear();
+        sel.text = None;
+        sel.cells = None;
+        sel.target = Target::Slides;
+    })?;
+    let text = s.doc()?.doc.slides.get(slide).and_then(|sl| sl.comments.get(index)).map(|c| c.text.clone()).unwrap_or_default();
+    Ok(json!({"slide": slide, "index": index, "text": text}))
+}
+
 fn accessibility(s: &mut Session, _p: &Value) -> Result<Value> {
     let st = s.doc()?;
     let mut out = vec![];
@@ -264,3 +327,53 @@ fn custom_show(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     ok()
 }
+
+#[cfg(test)]
+mod tests {
+    use serde_json::json;
+
+    use crate::Session;
+
+    #[test]
+    fn previous_and_next_comment_walk_the_deck() {
+        let mut s = Session::with_new();
+        let err = s.execute("comment.next", &json!({})).unwrap_err();
+        assert!(err.to_string().contains("no comments"), "{err}");
+
+        s.execute("comment.add", &json!({"text": "on first"})).unwrap();
+        s.execute("shape.insert", &json!({"preset": "rect", "rect": [10.0, 10.0, 40.0, 40.0]})).unwrap();
+        s.execute("slide.new", &json!({})).unwrap();
+        s.execute("comment.add", &json!({"text": "on second a"})).unwrap();
+        s.execute("comment.add", &json!({"text": "on second b"})).unwrap();
+        s.execute("slide.new", &json!({})).unwrap();
+        assert_eq!(s.doc().unwrap().selection.slide, 2);
+
+        let err = s.execute("comment.next", &json!({})).unwrap_err();
+        assert!(err.to_string().contains("no more comments"), "{err}");
+
+        let undo_before = s.doc().unwrap().history.undo.len();
+        let back = s.execute("comment.prev", &json!({})).unwrap();
+        assert_eq!(back["slide"], 1);
+        assert_eq!(back["index"], 1);
+        assert_eq!(back["text"], "on second b");
+        assert_eq!(s.doc().unwrap().selection.slide, 1);
+        assert!(s.doc().unwrap().selection.shapes.is_empty());
+        assert_eq!(s.doc().unwrap().history.undo.len(), undo_before);
+
+        let prev = s.execute("comment.prev", &json!({"slide": 1, "index": 1})).unwrap();
+        assert_eq!(prev["index"], 0);
+        assert_eq!(prev["text"], "on second a");
+        let first = s.execute("comment.prev", &json!({"slide": prev["slide"], "index": prev["index"]})).unwrap();
+        assert_eq!(first["slide"], 0);
+        assert_eq!(first["text"], "on first");
+        let err = s.execute("comment.prev", &json!({"slide": 0, "index": 0})).unwrap_err();
+        assert!(err.to_string().contains("no more comments"), "{err}");
+
+        let next = s.execute("comment.next", &json!({"slide": 0, "index": 0})).unwrap();
+        assert_eq!(next["slide"], 1);
+        assert_eq!(next["text"], "on second a");
+        s.execute("slide.go", &json!({"index": 0})).unwrap();
+        let here = s.execute("comment.next", &json!({})).unwrap();
+        assert_eq!(here["text"], "on first");
+    }
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..43e5f574 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -102,6 +102,9 @@ pub struct UiState {
     /// Format Shape pane: tab (`fill`, `effects`, `size`, `picture`, `text`).
     pub format_tab: String,
     pub grayscale: bool,
+    /// Comment the Review Previous/Next buttons last landed on: `(slide, index)`.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub comment_focus: Option<(usize, usize)>,
 }
 
 impl Default for UiState {
@@ -127,6 +130,7 @@ impl Default for UiState {
             ui_scale: 1.0,
             format_tab: "fill".into(),
             grayscale: false,
+            comment_focus: None,
         }
     }
 }
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..7995fd44 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -555,45 +555,97 @@ fn comments(app: &mut SlideApp, ui: &mut Ui) {
         app.dialog = Some(crate::dialogs::Dialog::new("comment"));
     }
     ui.separator();
-    let Some(st) = app.session.active() else { return };
-    let list = st.current_slide().map(|s| s.comments.clone()).unwrap_or_default();
-    if list.is_empty() {
-        ui.label(egui::RichText::new("No comments on this slide.").color(t.text_dim));
+    let threads: Vec<(usize, Vec<deckcraft_model::Comment>)> = app
+        .session
+        .active()
+        .map(|st| st.doc.slides.iter().enumerate().filter(|(_, sl)| !sl.comments.is_empty()).map(|(i, sl)| (i, sl.comments.clone())).collect())
+        .unwrap_or_default();
+    if threads.is_empty() {
+        ui.label(egui::RichText::new("No comments.").color(t.text_dim));
+        return;
     }
-    for (i, c) in list.iter().enumerate() {
-        egui::Frame::NONE.fill(t.chrome).corner_radius(CornerRadius::same(8)).inner_margin(egui::Margin::same(8)).show(ui, |ui| {
+    let focus = app.ui.comment_focus;
+    for (si, list) in threads {
+        ui.label(egui::RichText::new(format!("Slide {}", si + 1)).font(theme::bold(12.0)).color(t.text_dim));
+        ui.add_space(2.0);
+        for (i, c) in list.iter().enumerate() {
+            comment_card(app, ui, si, i, c, focus == Some((si, i)));
+            ui.add_space(6.0);
+        }
+    }
+}
+
+fn focus_comment(app: &mut SlideApp, slide: usize, index: usize) {
+    let _ = app.run("slide.go", json!({"index": slide}));
+    app.ui.comment_focus = Some((slide, index));
+}
+
+fn comment_card(app: &mut SlideApp, ui: &mut Ui, slide: usize, index: usize, c: &deckcraft_model::Comment, focused: bool) {
+    let t = Tokens::get(ui.ctx());
+    let stroke = if focused { Stroke::new(2.0, t.accent) } else { Stroke::NONE };
+    let shown = egui::Frame::NONE
+        .fill(if focused { t.selected } else { t.chrome })
+        .stroke(stroke)
+        .corner_radius(CornerRadius::same(8))
+        .inner_margin(egui::Margin::same(8))
+        .show(ui, |ui| {
             ui.set_width(ui.available_width());
-            ui.horizontal(|ui| {
+            let head = ui.horizontal(|ui| {
                 let (r, _) = ui.allocate_exact_size(vec2(24.0, 24.0), Sense::hover());
                 ui.painter().circle_filled(r.center(), 12.0, t.accent);
                 ui.painter().text(r.center(), Align2::CENTER_CENTER, &c.initials, theme::bold(11.0), Color32::WHITE);
                 ui.vertical(|ui| {
-                    ui.label(egui::RichText::new(&c.author).font(theme::bold(12.5)));
-                    ui.label(egui::RichText::new(c.date.replace('T', " ").trim_end_matches('Z')).size(10.5).color(t.text_faint));
+                    let name = ui.add(egui::Label::new(egui::RichText::new(&c.author).font(theme::bold(12.5))).sense(Sense::click()));
+                    if name.clicked() {
+                        focus_comment(app, slide, index);
+                    }
+                    let when = c.date.replace('T', " ").trim_end_matches('Z').to_string();
+                    let when = if c.resolved { format!("{when} · Resolved") } else { when };
+                    ui.label(egui::RichText::new(when).size(10.5).color(t.text_faint));
                 });
             });
-            ui.label(&c.text);
+            if head.response.clicked() {
+                focus_comment(app, slide, index);
+            }
+            let body = ui.add(egui::Label::new(&c.text).sense(Sense::click()));
+            if body.clicked() {
+                focus_comment(app, slide, index);
+            }
             for r in &c.replies {
                 ui.label(egui::RichText::new(format!("↳ {}: {}", r.author, r.text)).color(t.text_dim));
             }
             ui.horizontal(|ui| {
-                let id = ui.id().with(("reply", i));
+                let id = ui.id().with(("reply", slide, index));
                 let mut txt: String = ui.data_mut(|d| d.get_temp(id).unwrap_or_default());
                 let r = ui.add(egui::TextEdit::singleline(&mut txt).hint_text("Reply…").desired_width(ui.available_width() - 70.0));
                 if r.lost_focus() && ui.input(|i| i.key_pressed(egui::Key::Enter)) && !txt.trim().is_empty() {
-                    run(app, "comment.reply", json!({"index": i, "text": txt}));
+                    focus_comment(app, slide, index);
+                    run(app, "comment.reply", json!({"index": index, "text": txt}));
                     txt.clear();
                 }
                 ui.data_mut(|d| d.insert_temp(id, txt));
                 if ui.small_button(if c.resolved { "Reopen" } else { "Resolve" }).clicked() {
-                    run(app, "comment.resolve", json!({"index": i, "resolved": !c.resolved}));
+                    focus_comment(app, slide, index);
+                    run(app, "comment.resolve", json!({"index": index, "resolved": !c.resolved}));
                 }
                 if ui.small_button("🗑").clicked() {
-                    run(app, "comment.delete", json!({"index": i}));
+                    let _ = app.run("slide.go", json!({"index": slide}));
+                    let _ = app.run("comment.delete", json!({"index": index}));
+                    match app.ui.comment_focus {
+                        Some((fs, fi)) if fs == slide && fi == index => app.ui.comment_focus = None,
+                        Some((fs, fi)) if fs == slide && fi > index => app.ui.comment_focus = Some((fs, fi - 1)),
+                        _ => {}
+                    }
                 }
             });
         });
-        ui.add_space(6.0);
+    if focused {
+        let key = egui::Id::new("comment-focus-scrolled");
+        let seen = ui.data(|d| d.get_temp::<(usize, usize)>(key));
+        if seen != Some((slide, index)) {
+            ui.scroll_to_rect(shown.response.rect, Some(egui::Align::Center));
+            ui.data_mut(|d| d.insert_temp(key, (slide, index)));
+        }
     }
 }
 
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..f6c478ad 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1777,6 +1777,23 @@ fn record(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+fn comment_nav(app: &mut SlideApp, ui: &mut Ui, forward: bool) {
+    let (icon, label, id) = if forward { (Icon::NextComment, "Next", "comment.next") } else { (Icon::PrevComment, "Previous", "comment.prev") };
+    if small_button(ui, icon, label, enabled(app, id), false).on_hover_text(tip(id, label)).clicked() {
+        let params = match app.ui.comment_focus {
+            Some((slide, index)) if app.session.active().is_some_and(|d| d.selection.slide == slide) => json!({"slide": slide, "index": index}),
+            _ => json!({}),
+        };
+        if let Ok(v) = app.run(id, params)
+            && let (Some(slide), Some(index)) = (v.get("slide").and_then(Value::as_u64), v.get("index").and_then(Value::as_u64))
+            && let (Ok(slide), Ok(index)) = (usize::try_from(slide), usize::try_from(index))
+        {
+            app.ui.comment_focus = Some((slide, index));
+            app.ui.pane = Some("comments".into());
+        }
+    }
+}
+
 fn review(app: &mut SlideApp, ui: &mut Ui) {
     group(ui, |ui| {
         big(app, ui, Icon::Spelling, "Spelling", "app.dialog", json!({"id": "spelling"}));
@@ -1793,6 +1810,10 @@ fn review(app: &mut SlideApp, ui: &mut Ui) {
     });
     group(ui, |ui| {
         big(app, ui, Icon::NewComment, "New\nComment", "app.dialog", json!({"id": "comment"}));
+        rows(ui, |ui| {
+            comment_nav(app, ui, false);
+            comment_nav(app, ui, true);
+        });
         big(app, ui, Icon::DeleteComment, "Delete", "comment.delete", json!({}));
         let show = app.ui.pane.as_deref() == Some("comments");
         if big_button_ex(ui, Icon::ShowComments, "Show\nComments", true, false, show).0.clicked() {
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..3eefa9a9 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (228 commands; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -20,7 +20,7 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (228 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
 | L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Command registry: 228 (`comment.next`, `comment.prev`) |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..e8340d91 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Review previous/next comment; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -20,7 +20,7 @@ points and lead the beta plan.
 | Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window. Presenter view isn't placed on the second display automatically (drag it there) | 3–5 |
 | Add business content: tables, charts with their data, simple diagrams | partial (not blocking) | Tables with styles, merge/split, all D or P. Charts insert with the common types and edit data in the Chart Data dialog (P0 partial); SmartArt is basic (pre-drawn shapes) | 12–20 |
 | Share the deck: PDF of slides, notes or handouts; images | yes | `file.export` PDF with text layer, links, bookmarks, handouts 1–9; PNG/JPEG. Artwork is raster in the PDF; no direct print (print the PDF) | 10–16 |
-| Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft`; threads are flattened on `.pptx` save (#70); spelling is a small built-in list | 4–8 |
+| Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft`; Previous and Next walk every slide and the pane lists them; threads are flattened on `.pptx` save (#70); spelling is a small built-in list | 4–8 |
 
 ## Current focus (2026-10-10)
 
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Review workflow: previous and next comment across the deck |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..df8c95b0 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (228 commands; previous/next comment; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -232,14 +232,14 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   actions followed on click.
 - **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom;
   grayscale.
-- **Review:** comments with replies and resolve, accessibility checker, a basic spelling list.
+- **Review:** comments with replies and resolve, previous and next across the deck, accessibility checker, a basic spelling list.
 - **Media:** MP3, AAC/M4A, ALAC, WAV, AIFF, CAF, FLAC, Ogg Vorbis and Opus audio; H.264, HEVC,
   VP9 and AV1 video in MP4/MOV/WebM/MKV with pure-Rust decoders; poster frames, trim, fades,
   volume, loop, play across slides.
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 226 commands, every one reachable from `deckcraft-cli`, the JSON control channel
+- **Automation:** 228 commands, every one reachable from `deckcraft-cli`, the JSON control channel
   and MCP.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | 228 commands; Review lists previous and next comment. Breadth stays 79%; the comments checklist row stays D |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..121d88a5 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Comments pane lists every slide; Review Previous/Next; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -62,7 +62,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Format Background pane | yes | yes |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
-| Comments pane (threads) | yes | yes |
+| Comments pane (threads) | yes | yes: every slide, with Previous and Next on the Review tab |
 | Design Ideas (Designer) | yes (cloud) | no |
 | Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Comments pane lists every slide; Review ▸ Previous and Next walk the deck |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From aed386e26936970fd3d19ccb7483f4401d281a0d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:39:00 +0300
Subject: [PATCH 270/376] Charts: draw, read and write value-axis minor
 gridlines

---
 crates/model/src/chart.rs      |  3 +++
 crates/pptx/src/read/chart.rs  | 11 +++++++++++
 crates/pptx/src/write/chart.rs |  3 +++
 crates/pptx/src/write/mod.rs   |  2 +-
 crates/render/src/chart.rs     | 20 ++++++++++++++++++++
 5 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index aebee497..936d0c9e 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -159,6 +159,8 @@ pub struct Chart {
     pub title_size: Option<f64>,
     pub data_labels: bool,
     pub gridlines: bool,
+    /// `c:minorGridlines` on the value axis: five to a major unit, between the major ones.
+    pub minor_gridlines: bool,
     pub axis_titles: (Option<String>, Option<String>),
     /// Chart style number (1–48) and colour palette (`colorful1`, `monochrome3`…).
     pub style: u32,
@@ -204,6 +206,7 @@ impl Default for Chart {
             title_size: None,
             data_labels: false,
             gridlines: true,
+            minor_gridlines: false,
             axis_titles: (None, None),
             style: 2,
             palette: "colorful1".into(),
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 6d7541ff..a3fe4e86 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -266,6 +266,7 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
     let cat_ax = pa.child("catAx").or_else(|| pa.child("dateAx")).or_else(|| pa.children_named("valAx").find(|a| !vertical(a)));
     if let Some(v) = val_ax {
         c.gridlines = v.child("majorGridlines").is_some();
+        c.minor_gridlines = v.child("minorGridlines").is_some();
         let sc = v.child("scaling");
         c.y_min = sc.and_then(|s| s.child_val("min")).and_then(|v| v.parse().ok()).filter(|v: &f64| v.is_finite());
         c.y_max = sc.and_then(|s| s.child_val("max")).and_then(|v| v.parse().ok()).filter(|v: &f64| v.is_finite());
@@ -310,6 +311,16 @@ fn text_size(e: Option<&El>) -> Option<f64> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn minor_gridlines_are_read_and_written_back() {
+        let mut c = Chart::sample(ChartType::Line);
+        c.minor_gridlines = true;
+        let back = read_chart_xml(&crate::write::chart::chart_xml(&c)).unwrap();
+        assert!(back.gridlines && back.minor_gridlines);
+        c.minor_gridlines = false;
+        assert!(!read_chart_xml(&crate::write::chart::chart_xml(&c)).unwrap().minor_gridlines);
+    }
+
     #[test]
     fn legend_position_and_overlay_are_read() {
         let legend = r#"<c:legend><c:legendPos val="r"/><c:overlay val="1"/></c:legend>"#;
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 76567c9e..fc7406fe 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -286,6 +286,9 @@ fn axes(w: &mut W, c: &Chart, g: Group) {
     if c.gridlines {
         w.empty0("c:majorGridlines");
     }
+    if c.minor_gridlines {
+        w.empty0("c:minorGridlines");
+    }
     if let Some(t) = &c.axis_titles.1 {
         title(w, t);
     }
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..a5ebcf95 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -1,6 +1,6 @@
 //! PPTX export: [`Presentation`] → package.
 
-mod chart;
+pub(crate) mod chart;
 pub(crate) mod dml;
 mod shapes;
 mod theme;
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..cf71fe0b 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -282,6 +282,26 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         (true, Some((min2, max2, _))) => plot.y1 - (v - min2) / (max2 - min2).max(1e-9) * plot.height(),
         _ => to_v(v),
     };
+    // Minor gridlines, under the major ones: five to a major unit.
+    if c.minor_gridlines {
+        let minor = step / 5.0;
+        let n = (((max - min) / minor.max(1e-12)).round() as i64).clamp(1, 500);
+        let mut g = BezPath::new();
+        for k in (0..=n).filter(|k| k % 5 != 0) {
+            let pos = to_v(min + k as f64 * minor);
+            if horiz {
+                g.move_to((pos, plot.y0));
+                g.line_to((pos, plot.y1));
+            } else {
+                g.move_to((plot.x0, pos));
+                g.line_to((plot.x1, pos));
+            }
+        }
+        ctx.set_transform(m);
+        ctx.set_paint(color(Rgba::rgb(0xF2, 0xF2, 0xF2), 1.0));
+        ctx.set_stroke(kurbo::Stroke::new(0.75));
+        ctx.stroke_path(&g);
+    }
     // Gridlines and value labels.
     for v in ticks((min, max, step)) {
         let pos = to_v(v);

From b6aa6ab4e4c547190e8cc9de69c8d7b53139d17a Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:41:01 +0300
Subject: [PATCH 271/376] UI: Date and Time dialog inserts a format in one step
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Insert › Date & Time opens the format list instead of placing a date
immediately. With no format, update flag or language, insert.dateTime
opens the dialog and does not edit. OK applies one undo: a field when
Update automatically is on, or the shown text when it is off.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                           |   2 +
 crates/engine/src/cmd/insert.rs      | 340 ++++++++++++++++++++++++++-
 crates/ui-egui/src/datetime_tests.rs |  78 ++++++
 crates/ui-egui/src/dialogs.rs        |  93 ++++++++
 crates/ui-egui/src/lib.rs            |   4 +
 crates/ui-egui/src/ribbon.rs         |   7 +-
 docs/architecture.md                 |   5 +-
 docs/gaps.md                         |   7 +-
 docs/target-app-parity.md            |   4 +-
 docs/ui-parity.md                    |   7 +-
 10 files changed, 533 insertions(+), 14 deletions(-)
 create mode 100644 crates/ui-egui/src/datetime_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..77d095c7 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Insert › Date and Time: the ribbon and Insert menu open a format list (datetime1–datetime13) with a language and Update automatically. OK inserts one field, or the shown text when Update is off. 28 dialogs; 226 commands. English has every format; en-GB, French, Japanese and Swedish list the numeric date and 24-hour time |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Insert › Date and Time dialog (28 dialogs, 226 commands; breadth and readiness unchanged) |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..438878ef 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -47,7 +47,15 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("insert.video", "Video from File…", ["Insert", "Media", "Video"], None, "{path? | data: base64, name?, rect?}", has_slide, video),
         cmd!("insert.wordArt", "WordArt", ["Insert", "Text"], None, "{text?, style?: 0..}", has_slide, word_art),
         cmd!("insert.slideNumber", "Slide Number", ["Insert", "Text"], None, "{}", has_slide, slide_number),
-        cmd!("insert.dateTime", "Date & Time", ["Insert", "Text"], None, "{format?: datetime1..}", has_slide, date_time),
+        cmd!(
+            "insert.dateTime",
+            "Date & Time",
+            ["Insert", "Text"],
+            None,
+            "{format?: datetime1..datetime13, update?: bool, language?: en-US|en-GB|fr-FR|ja-JP|sv-SE} — no keys opens the dialog",
+            has_slide,
+            date_time
+        ),
         cmd!("insert.symbol", "Symbol", ["Insert", "Symbols"], None, "{text: character(s)}", has_slide, symbol),
         cmd!(
             "insert.hyperlink",
@@ -562,10 +570,198 @@ fn field_run(s: &mut Session, field: &str, text: &str) -> Result<Value> {
 fn slide_number(s: &mut Session, _p: &Value) -> Result<Value> {
     field_run(s, "slidenum", "‹#›")
 }
+
+const DATE_FORMATS: [&str; 13] = [
+    "datetime1",
+    "datetime2",
+    "datetime3",
+    "datetime4",
+    "datetime5",
+    "datetime6",
+    "datetime7",
+    "datetime8",
+    "datetime9",
+    "datetime10",
+    "datetime11",
+    "datetime12",
+    "datetime13",
+];
+
+struct DateOpts {
+    format: String,
+    update: bool,
+    /// BCP 47 tag when the caller set `language`; absent keeps the surrounding run's language.
+    lang: Option<String>,
+    sample: String,
+}
+
+/// `true` when the call carries a format, update flag or language (apply it). Empty params open
+/// the dialog instead.
+fn date_time_apply(p: &Value) -> bool {
+    p.as_object().is_some_and(|o| o.contains_key("format") || o.contains_key("update") || o.contains_key("language"))
+}
+
+fn canon_lang(raw: &str) -> Option<&'static str> {
+    match raw.trim().to_ascii_lowercase().replace('_', "-").as_str() {
+        "en" | "en-us" => Some("en-US"),
+        "en-gb" => Some("en-GB"),
+        "fr" | "fr-fr" => Some("fr-FR"),
+        "ja" | "ja-jp" => Some("ja-JP"),
+        "sv" | "sv-se" => Some("sv-SE"),
+        _ => None,
+    }
+}
+
+fn date_opts(p: &Value) -> Result<DateOpts> {
+    if p.get("format").is_some() {
+        let f = str_param(p, "format").filter(|f| DATE_FORMATS.contains(f));
+        if f.is_none() {
+            return Err(bad("insert.dateTime", "`format` must be datetime1..datetime13"));
+        }
+    }
+    if p.get("update").is_some() && bool_param(p, "update").is_none() {
+        return Err(bad("insert.dateTime", "`update` must be true or false"));
+    }
+    let lang = if p.get("language").is_some() {
+        let raw = str_param(p, "language").filter(|l| !l.trim().is_empty());
+        let Some(raw) = raw else {
+            return Err(bad("insert.dateTime", "`language` must be en-US, en-GB, fr-FR, ja-JP or sv-SE"));
+        };
+        Some(canon_lang(raw).ok_or_else(|| bad("insert.dateTime", "`language` must be en-US, en-GB, fr-FR, ja-JP or sv-SE"))?.to_string())
+    } else {
+        None
+    };
+    let format = str_param(p, "format").unwrap_or("datetime1").to_string();
+    let sample = date_sample(&format, lang.as_deref())?;
+    Ok(DateOpts { format, update: bool_or(p, "update", true), lang, sample })
+}
+
+/// The text `format` shows now in `lang`. Errors when that language has no names for the format
+/// (month names and AM/PM are English only). An empty string where there is no clock (wasm).
+fn date_sample(format: &str, lang: Option<&str>) -> Result<String> {
+    use deckcraft_text::datetime::{DateTime, field_text};
+    let probe = DateTime::new(2026, 10, 9, 20, 5, 7);
+    if field_text(format, lang, probe).is_none() {
+        return Err(bad("insert.dateTime", "this format isn't available in that language"));
+    }
+    Ok(DateTime::now_local().and_then(|now| field_text(format, lang, now)).unwrap_or_default())
+}
+
 fn date_time(s: &mut Session, p: &Value) -> Result<Value> {
-    let f = str_param(p, "format").unwrap_or("datetime1").to_string();
-    // Saved with the date it shows now (the text kept where the date can't be computed).
-    field_run(s, &f, &super::design::date_field_text(&f))
+    if !date_time_apply(p) {
+        s.ui_requests.push(crate::UiRequest::Dialog { id: "dateTime".into(), params: json!({}) });
+        return ok();
+    }
+    let opts = date_opts(p)?;
+    let (doc, sel) = {
+        let st = s.doc()?;
+        (st.doc.clone(), st.selection.clone())
+    };
+    let r = apply_date(s, &opts);
+    if r.is_err()
+        && let Some(st) = s.active_mut()
+    {
+        st.doc = doc;
+        st.selection = sel;
+    }
+    r
+}
+
+fn apply_date(s: &mut Session, o: &DateOpts) -> Result<Value> {
+    if s.doc()?.selection.text.is_some() {
+        if o.update {
+            super::text::insert_field(s, &o.format, &o.sample)?;
+            if let Some(lang) = &o.lang {
+                stamp_caret_lang(s, lang)?;
+            }
+        } else {
+            insert_plain(s, &o.sample, o.lang.as_deref())?;
+        }
+        return Ok(json!({"where": "caret", "format": o.format, "update": o.update, "text": o.sample}));
+    }
+    // Not editing: the slide's date placeholder (this slide only). A layout with no date
+    // placeholder gets a text box instead, so the chosen format is still inserted.
+    s.execute("design.headerFooter", &json!({"date": true, "all": false}))?;
+    if !write_date_placeholder(s, o)? {
+        return insert_date_box(s, o);
+    }
+    Ok(json!({"where": "footer", "format": o.format, "update": o.update, "text": o.sample}))
+}
+
+/// Point the current slide's date placeholder at this format (a field, or the sample as plain text).
+fn write_date_placeholder(s: &mut Session, o: &DateOpts) -> Result<bool> {
+    let format = o.format.clone();
+    let sample = o.sample.clone();
+    let lang = o.lang.clone();
+    let update = o.update;
+    s.edit(|doc, sel| {
+        let Some(sl) = doc.slides.get_mut(sel.slide) else { return Ok(false) };
+        let sl = std::sync::Arc::make_mut(sl);
+        let Some(sh) = sl.shapes.iter_mut().find(|x| x.ph_type() == Some(deckcraft_model::PhType::Date)) else {
+            return Ok(false);
+        };
+        let mut props = sh.text.as_ref().and_then(|t| t.paragraphs.first()).and_then(|p| p.runs.first()).map(|r| r.props.clone()).unwrap_or_default();
+        if let Some(lang) = lang {
+            props.lang = Some(lang);
+        }
+        let kind = if update { RunKind::Field { field: format } } else { RunKind::Text };
+        let para = deckcraft_model::Paragraph { runs: vec![deckcraft_model::Run { text: sample, props, kind }], ..Default::default() };
+        let body = sh.text.clone().unwrap_or_default();
+        sh.text = Some(TextBody { paragraphs: vec![para], ..body });
+        Ok(true)
+    })
+}
+
+fn insert_date_box(s: &mut Session, o: &DateOpts) -> Result<Value> {
+    let size = s.doc()?.doc.slide_size;
+    let y = (size.height - 48.0).max(0.0);
+    s.execute("insert.textBox", &json!({"rect": [36.0, y, 360.0, 28.0], "text": ""}))?;
+    if o.update {
+        super::text::insert_field(s, &o.format, &o.sample)?;
+    } else {
+        super::text::insert_text(s, &o.sample, None)?;
+    }
+    if let Some(lang) = &o.lang {
+        stamp_caret_lang(s, lang)?;
+    }
+    Ok(json!({"where": "textBox", "format": o.format, "update": o.update, "text": o.sample}))
+}
+
+/// Insert `text` at the caret. `lang`, when set, is on that run before runs with equal props merge,
+/// so the date stays its own run next to the surrounding text.
+fn insert_plain(s: &mut Session, text: &str, lang: Option<&str>) -> Result<()> {
+    let text = text.to_string();
+    let lang = lang.map(str::to_string);
+    super::text::edit_text(s, move |body, t| {
+        let (a, b) = t.ordered();
+        let at = deckcraft_model::edit::delete(body, a, b);
+        let mut props = deckcraft_model::edit::props_at(body, at);
+        if let Some(lang) = lang.clone() {
+            props.lang = Some(lang);
+        }
+        let c = deckcraft_model::edit::insert(body, at, &text, Some(props));
+        t.anchor = c;
+        t.caret = c;
+    })?;
+    Ok(())
+}
+
+/// Tag the run that ends at the caret with `lang`, so a date field keeps that language when it updates.
+fn stamp_caret_lang(s: &mut Session, lang: &str) -> Result<()> {
+    let lang = lang.to_string();
+    super::text::edit_text(s, move |body, t| {
+        let Some(p) = body.paragraphs.get_mut(t.caret.0) else { return };
+        let mut at = 0usize;
+        for r in &mut p.runs {
+            let n = r.char_len();
+            if n > 0 && at < t.caret.1 && t.caret.1 <= at + n {
+                r.props.lang = Some(lang);
+                return;
+            }
+            at += n;
+        }
+    })?;
+    Ok(())
 }
 
 fn symbol(s: &mut Session, p: &Value) -> Result<Value> {
@@ -798,3 +994,139 @@ fn smart_art(s: &mut Session, p: &Value) -> Result<Value> {
     }
     Ok(g)
 }
+
+#[cfg(test)]
+mod tests {
+    use deckcraft_model::text::RunKind;
+    use serde_json::json;
+
+    use crate::Session;
+
+    fn session() -> Session {
+        Session::with_new()
+    }
+
+    fn undo(s: &Session) -> usize {
+        s.doc().unwrap().history.undo.len()
+    }
+
+    fn date_run(s: &Session) -> Option<deckcraft_model::Run> {
+        s.doc()
+            .unwrap()
+            .current_slide()
+            .unwrap()
+            .shapes
+            .iter()
+            .find(|x| x.ph_type() == Some(deckcraft_model::PhType::Date))
+            .and_then(|x| x.text.as_ref())
+            .and_then(|t| t.paragraphs.first())
+            .and_then(|p| p.runs.first())
+            .cloned()
+    }
+
+    fn title_field(s: &Session) -> deckcraft_model::Run {
+        let title = s.doc().unwrap().current_slide().unwrap().shapes[0].text.clone().unwrap();
+        title.paragraphs[0].runs.iter().find(|r| r.text.contains(':') || matches!(r.kind, RunKind::Field { .. })).cloned().unwrap()
+    }
+
+    fn edit_title(s: &mut Session) {
+        let id = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+        s.execute("text.edit", &json!({"id": id})).unwrap();
+        s.execute("text.insert", &json!({"text": "On "})).unwrap();
+    }
+
+    #[test]
+    fn no_params_opens_the_dialog_and_edits_nothing() {
+        let mut s = session();
+        let rev = s.doc().unwrap().revision;
+        for p in [json!({}), serde_json::Value::Null] {
+            s.ui_requests.clear();
+            s.execute("insert.dateTime", &p).unwrap();
+            assert!(matches!(&s.ui_requests[..], [crate::UiRequest::Dialog { id, .. }] if id == "dateTime"));
+            assert_eq!(s.doc().unwrap().revision, rev);
+            assert_eq!(undo(&s), 0);
+            assert!(date_run(&s).is_none());
+        }
+    }
+
+    #[test]
+    fn a_format_at_the_caret_is_one_updating_field() {
+        let mut s = session();
+        edit_title(&mut s);
+        let before = undo(&s);
+        let v = s.execute("insert.dateTime", &json!({"format": "datetime10", "update": true})).unwrap();
+        assert_eq!(v["where"], "caret");
+        let run = title_field(&s);
+        assert!(matches!(run.kind, RunKind::Field { ref field } if field == "datetime10"), "{run:?}");
+        assert!(run.text.contains(':'), "{run:?}");
+        assert_eq!(undo(&s), before + 1);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Date & Time");
+        s.execute("edit.undo", &json!({})).unwrap();
+        let title = s.doc().unwrap().current_slide().unwrap().shapes[0].text.as_ref().unwrap().text();
+        assert_eq!(title, "On ");
+    }
+
+    #[test]
+    fn update_false_inserts_plain_text_in_the_chosen_language() {
+        let mut s = session();
+        edit_title(&mut s);
+        let before = undo(&s);
+        let now = deckcraft_text::datetime::DateTime::now_local().unwrap();
+        let expect = deckcraft_text::datetime::field_text("datetime1", Some("en-GB"), now).unwrap();
+        s.execute("insert.dateTime", &json!({"format": "datetime1", "update": false, "language": "en-GB"})).unwrap();
+        let title = s.doc().unwrap().current_slide().unwrap().shapes[0].text.clone().unwrap();
+        let run = title.paragraphs[0].runs.iter().find(|r| r.text == expect).cloned().unwrap();
+        assert_eq!(run.kind, RunKind::Text);
+        assert_eq!(run.props.lang.as_deref(), Some("en-GB"));
+        assert_eq!(undo(&s), before + 1);
+    }
+
+    #[test]
+    fn a_named_format_in_french_and_a_bad_value_change_nothing() {
+        let mut s = session();
+        edit_title(&mut s);
+        let rev = s.doc().unwrap().revision;
+        let undos = undo(&s);
+        let err = s.execute("insert.dateTime", &json!({"format": "datetime2", "language": "fr-FR"})).unwrap_err();
+        assert!(err.to_string().contains("isn't available"), "{err}");
+        assert_eq!(s.doc().unwrap().revision, rev);
+        assert_eq!(undo(&s), undos);
+        for p in [
+            json!({"format": "datetime14"}),
+            json!({"format": "nope"}),
+            json!({"update": "yes"}),
+            json!({"language": "de-DE"}),
+            json!({"language": ""}),
+        ] {
+            let err = s.execute("insert.dateTime", &p).unwrap_err();
+            assert!(err.to_string().contains("insert.dateTime"), "{err}");
+            assert_eq!(s.doc().unwrap().revision, rev);
+            assert_eq!(undo(&s), undos);
+        }
+    }
+
+    #[test]
+    fn without_a_caret_the_date_lands_on_this_slide_only() {
+        let mut s = session();
+        s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+        s.execute("slide.go", &json!({"index": 0})).unwrap();
+        let now = deckcraft_text::datetime::DateTime::now_local().unwrap();
+        let clock = deckcraft_text::datetime::field_text("datetime10", Some("en-US"), now).unwrap();
+        let v = s.execute("insert.dateTime", &json!({"format": "datetime10", "language": "en_US"})).unwrap();
+        assert_eq!(v["where"], "footer");
+        let run = date_run(&s).unwrap();
+        assert!(matches!(run.kind, RunKind::Field { ref field } if field == "datetime10"), "{run:?}");
+        assert_eq!(run.text, clock);
+        assert_eq!(run.props.lang.as_deref(), Some("en-US"));
+        s.execute("slide.go", &json!({"index": 1})).unwrap();
+        assert!(date_run(&s).is_none(), "the other slide keeps its own footer");
+        s.execute("slide.go", &json!({"index": 0})).unwrap();
+        let fixed = deckcraft_text::datetime::field_text("datetime12", None, now).unwrap();
+        s.execute("insert.dateTime", &json!({"format": "datetime12", "update": false})).unwrap();
+        let run = date_run(&s).unwrap();
+        assert_eq!((run.kind, run.text), (RunKind::Text, fixed));
+        s.execute("edit.undo", &json!({})).unwrap();
+        let run = date_run(&s).unwrap();
+        assert!(matches!(run.kind, RunKind::Field { .. }), "one undo restores the field");
+    }
+}
diff --git a/crates/ui-egui/src/datetime_tests.rs b/crates/ui-egui/src/datetime_tests.rs
new file mode 100644
index 00000000..c955aa2e
--- /dev/null
+++ b/crates/ui-egui/src/datetime_tests.rs
@@ -0,0 +1,78 @@
+//! Insert › Date and Time, driven like a person: the ribbon opens the dialog, a format is
+//! chosen, OK inserts it in one undo, Cancel leaves the slide alone.
+
+use deckcraft_engine::Session;
+use deckcraft_model::text::RunKind;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.ui.tab = "Insert".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1800.0, 1100.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn date_run(h: &Harness<'_, SlideApp>) -> Option<deckcraft_model::Run> {
+    h.state()
+        .session
+        .active()
+        .unwrap()
+        .current_slide()
+        .unwrap()
+        .shapes
+        .iter()
+        .find(|x| x.ph_type() == Some(deckcraft_model::PhType::Date))
+        .and_then(|x| x.text.as_ref())
+        .and_then(|t| t.paragraphs.first())
+        .and_then(|p| p.runs.first())
+        .cloned()
+}
+
+#[test]
+fn insert_opens_the_dialog_and_ok_inserts_one_field() {
+    let mut h = harness();
+    h.get_by_label("Date & Time").click();
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("dateTime"));
+    let _ = h.get_by_label("Update automatically");
+    let _ = h.get_by_label("English (United States)");
+    let now = deckcraft_text::datetime::DateTime::now_local().unwrap();
+    let sample = deckcraft_text::datetime::field_text("datetime2", Some("en-US"), now).unwrap();
+    h.get_by_label(&sample).click();
+    h.run_steps(1);
+    h.get_by_label("OK").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none());
+    let run = date_run(&h).unwrap();
+    assert!(matches!(run.kind, RunKind::Field { ref field } if field == "datetime2"), "{run:?}");
+    assert_eq!(run.text, sample);
+    let undo = &h.state().session.active().unwrap().history.undo;
+    assert_eq!(undo.len(), 1);
+    assert_eq!(undo[0].label, "Date & Time");
+    h.state_mut().session.execute("edit.undo", &json!({})).unwrap();
+    h.run_steps(1);
+    assert!(date_run(&h).is_none());
+}
+
+#[test]
+fn cancel_closes_the_dialog_without_a_date() {
+    let mut h = harness();
+    h.get_by_label("Date & Time").click();
+    h.run_steps(2);
+    h.get_by_label("Cancel").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none());
+    assert!(date_run(&h).is_none());
+    assert!(h.state().session.active().unwrap().history.undo.is_empty());
+}
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..8c15df91 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -48,6 +48,7 @@ fn title(id: &str) -> &'static str {
         "export" => "Export",
         "symbol" => "Symbol",
         "equation" => "Equation",
+        "dateTime" => "Date and Time",
         "spelling" => "Spelling",
         "accessibility" => "Accessibility Checker",
         "language" => "Language",
@@ -730,6 +731,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             let (ok, _) = buttons(ui, "Done");
             ok
         }
+        "dateTime" => date_time_dialog(app, ui, d),
         _ => {
             ui.label(format!("“{}” is not available yet.", d.id));
             let (ok, cancel) = buttons(ui, "OK");
@@ -738,6 +740,97 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     }
 }
 
+const DATE_LANGS: &[(&str, &str)] = &[
+    ("en-US", "English (United States)"),
+    ("en-GB", "English (United Kingdom)"),
+    ("fr-FR", "French (France)"),
+    ("ja-JP", "Japanese"),
+    ("sv-SE", "Swedish"),
+];
+
+const DATE_KINDS: [&str; 13] = [
+    "datetime1",
+    "datetime2",
+    "datetime3",
+    "datetime4",
+    "datetime5",
+    "datetime6",
+    "datetime7",
+    "datetime8",
+    "datetime9",
+    "datetime10",
+    "datetime11",
+    "datetime12",
+    "datetime13",
+];
+
+/// Samples `field_text` can compute for `lang`. Named months and AM/PM exist for English only;
+/// other languages keep the numeric date and the 24-hour times.
+fn date_rows(lang: &str) -> Vec<(&'static str, String)> {
+    let now = deckcraft_text::datetime::DateTime::now_local();
+    let mut rows = Vec::new();
+    for kind in DATE_KINDS {
+        if let Some(now) = now
+            && let Some(sample) = deckcraft_text::datetime::field_text(kind, Some(lang), now)
+        {
+            rows.push((kind, sample));
+        }
+    }
+    if rows.is_empty() {
+        rows.push(("datetime1", "datetime1".into()));
+    }
+    rows
+}
+
+fn date_time_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    ui.set_min_width(440.0);
+    ui.label("Available formats:");
+    let lang = d.get("language", "en-US");
+    let rows = date_rows(&lang);
+    if !rows.iter().any(|(k, _)| *k == d.get("format", "datetime1"))
+        && let Some((k, _)) = rows.first()
+    {
+        d.fields.insert("format".into(), (*k).to_string());
+    }
+    let format = d.get("format", "datetime1");
+    egui::ScrollArea::vertical().max_height(280.0).min_scrolled_height(220.0).auto_shrink([false, false]).show(ui, |ui| {
+        for (kind, sample) in &rows {
+            if ui.selectable_label(format == *kind, sample).clicked() {
+                d.fields.insert("format".into(), (*kind).to_string());
+            }
+        }
+    });
+    let lang_label = DATE_LANGS.iter().find(|(k, _)| *k == lang).map(|(_, l)| *l).unwrap_or("English (United States)");
+    ui.horizontal(|ui| {
+        ui.label("Language:");
+        let opened = egui::ComboBox::from_id_salt("date-lang").selected_text(lang_label).width(240.0).show_ui(ui, |ui| {
+            for (k, l) in DATE_LANGS {
+                if ui.selectable_label(lang == *k, *l).clicked() {
+                    d.fields.insert("language".into(), (*k).to_string());
+                }
+            }
+        });
+        opened.response.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::ComboBox, true, lang_label));
+    });
+    ui.label(
+        egui::RichText::new("Month names and AM/PM are listed for English. Other languages list the numeric date and 24-hour time.")
+            .size(11.0)
+            .color(Tokens::get(ui.ctx()).text_dim),
+    );
+    let update = check(ui, d, "Update automatically", "update", true);
+    let (ok, cancel) = buttons(ui, "OK");
+    if ok {
+        let lang = d.get("language", "en-US");
+        let mut format = d.get("format", "datetime1");
+        let probe = deckcraft_text::datetime::DateTime::new(2026, 10, 9, 20, 5, 7);
+        if deckcraft_text::datetime::field_text(&format, Some(&lang), probe).is_none() {
+            format = "datetime1".into();
+        }
+        return app.run("insert.dateTime", json!({"format": format, "update": update, "language": lang})).is_ok();
+    }
+    cancel
+}
+
 fn pretty_equation(s: &str) -> String {
     let sup = |c: char| match c {
         '0' => '⁰',
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..ca47471b 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1130,6 +1130,10 @@ fn js_now() -> f64 {
 #[cfg(test)]
 mod ime_tests;
 
+#[cfg(test)]
+#[path = "datetime_tests.rs"]
+mod datetime_tests;
+
 #[cfg(test)]
 mod tests {
     #![allow(clippy::unwrap_used, clippy::expect_used)]
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..ba82ef70 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -229,7 +229,12 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
 
 fn big(app: &mut SlideApp, ui: &mut Ui, icon: Icon, label: &str, id: &str, p: Value) {
     let en = enabled(app, id);
-    if big_button(ui, icon, label, en).on_hover_text(tip(id, label)).clicked() {
+    let resp = big_button(ui, icon, label, en);
+    if id == "insert.dateTime" {
+        let name = label.replace('\n', " ");
+        resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, en, &name));
+    }
+    if resp.on_hover_text(tip(id, label)).clicked() {
         run(app, id, p);
     }
 }
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..dae0b179 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Date and Time dialog; 28 dialogs, 226 commands; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -21,7 +21,7 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
 | L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
+| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Insert › Date and Time dialog (`insert.dateTime` with no keys). 28 dialogs; command count stays 226 |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..9bb1caa8 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Date and Time dialog; 28 dialogs; previous: 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,8 +203,8 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
+  Replace Fonts, Action Settings, Print, Insert Object…). Date and Time is in. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Insert › Date and Time dialog. Dialog count 27 → 28; Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print and Insert Object are still missing |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..d0777f60 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -219,7 +219,8 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   text readable.
 - **Text:** in-place editing with caret, selection, keyboard and mouse; every Home-tab font and
   paragraph control; bullets and numbering; levels; autofit; columns; vertical text; date fields in
-  their own format; hyperlinks drawn in the theme's hyperlink colour and followed in the show.
+  their own format (Insert › Date and Time picks the format and language, or inserts the sample as
+  fixed text); hyperlinks drawn in the theme's hyperlink colour and followed in the show.
   UAX #9 bidi and Arabic shaping with HarfRust, script font slots with per-cluster fallback,
   `justLow` kashida, bidi caret and selection.
 - **Editing:** select, marquee, move, resize, rotate, adjust; smart guides; nudge; duplicate;
@@ -276,6 +277,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Insert › Date and Time noted under what works today. The d556ff9 snapshot (226 commands, 27 dialogs) and the readiness percentages are unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..35c40b19 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,8 +1,8 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Date and Time dialog; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Date and Time dialog; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Date and Time, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Insert › Date and Time: format list, language, Update automatically. 28 dialogs. Languages are the ones the date field can compute (English, plus numeric dates for en-GB, fr-FR, ja-JP, sv-SE) |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 4a7ad03eb0cbdd287ec44651d8041dd35fac2760 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:45:26 +0300
Subject: [PATCH 272/376] Charts: logarithmic value axes

---
 crates/model/src/chart.rs      | 30 ++++++++++++++++++++++++++++++
 crates/pptx/src/read/chart.rs  |  7 +++++++
 crates/pptx/src/write/chart.rs |  3 +++
 crates/render/src/chart.rs     | 30 ++++++++++++++++++++++++------
 4 files changed, 64 insertions(+), 6 deletions(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index aebee497..04b591ce 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -174,6 +174,8 @@ pub struct Chart {
     pub y_max: Option<f64>,
     /// The value axis' major unit, when the chart fixes it.
     pub y_major: Option<f64>,
+    /// `c:scaling/c:logBase`: the value axis is logarithmic in this base (2–1000).
+    pub y_log_base: Option<f64>,
     /// The value axis' number format (an Excel format code such as `#,##0` or `0.0%`).
     pub y_format: Option<String>,
     /// The value axis is deleted (`c:delete`): no labels, though gridlines may stay.
@@ -217,6 +219,7 @@ impl Default for Chart {
             y_min: None,
             y_max: None,
             y_major: None,
+            y_log_base: None,
             y_format: None,
             y_hidden: false,
             y2_min: None,
@@ -311,6 +314,22 @@ impl Chart {
         Some(axis_scale(lo, hi, fmin, fmax, major, max_intervals, !full_percent))
     }
 
+    /// A logarithmic value axis' scale in exponents — (min, max, unit), so its labels are
+    /// `base^min`, `base^(min+unit)`… — covering the positive values: whole powers, as PowerPoint
+    /// and LibreOffice draw them. `None` when the axis isn't logarithmic or nothing is positive.
+    pub fn log_axis_scale(&self, max_intervals: usize) -> Option<(f64, f64, f64)> {
+        let b = self.y_log_base.filter(|b| b.is_finite() && *b >= 2.0)?;
+        let vals = self.series.iter().filter(|s| !self.on_secondary(s)).flat_map(|s| s.values.iter().flatten().copied());
+        let (lo, hi) = vals
+            .filter(|v| v.is_finite() && *v > 0.0)
+            .fold(None, |r: Option<(f64, f64)>, v| Some(r.map_or((v, v), |(a, z)| (a.min(v), z.max(v)))))?;
+        let e = |v: f64| v.log(b);
+        let lo = self.y_min.filter(|v| *v > 0.0).map_or(e(lo).floor(), e);
+        let hi = self.y_max.filter(|v| *v > 0.0).map_or(e(hi).ceil(), e).max(lo + 1.0);
+        let unit = ((hi - lo) / max_intervals.max(1) as f64).ceil().max(1.0);
+        Some((lo, lo + ((hi - lo) / unit).ceil() * unit, unit))
+    }
+
     /// A value axis label in the axis' number format and the chart's language.
     pub fn axis_label(&self, secondary: bool, v: f64) -> String {
         let code = if secondary { &self.y2_format } else { &self.y_format };
@@ -431,6 +450,17 @@ pub fn nice_scale(lo: f64, hi: f64) -> (f64, f64, f64) {
 mod tests {
     use super::*;
 
+    #[test]
+    fn log_axes_run_over_whole_powers() {
+        let mut c = Chart::sample(ChartType::Line);
+        c.series.truncate(1);
+        c.series[0].values = vec![Some(1.0), Some(10.0), Some(1000.0), Some(50000.0)];
+        assert_eq!(c.log_axis_scale(8), None);
+        c.y_log_base = Some(10.0);
+        assert_eq!(c.log_axis_scale(8), Some((0.0, 5.0, 1.0)));
+        assert_eq!(c.log_axis_scale(2), Some((0.0, 6.0, 3.0)));
+    }
+
     #[test]
     fn nice_scale_covers() {
         let (a, b, s) = nice_scale(0.0, 5.1);
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 6d7541ff..2d2981bb 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -271,6 +271,7 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
         c.y_max = sc.and_then(|s| s.child_val("max")).and_then(|v| v.parse().ok()).filter(|v: &f64| v.is_finite());
         c.axis_titles.1 = v.child("title").map(|t| rich_text(t).unwrap_or_else(|| "Axis Title".into()));
         c.y_major = num(v, "majorUnit");
+        c.y_log_base = sc.and_then(|s| s.child_val("logBase")).and_then(|v| v.parse().ok()).filter(|b: &f64| b.is_finite() && *b >= 2.0);
         c.y_format = format_code(v);
         c.y_hidden = deleted(v);
     }
@@ -310,6 +311,12 @@ fn text_size(e: Option<&El>) -> Option<f64> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn log_base_is_read() {
+        let xml = br#"<c:chartSpace xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart"><c:chart><c:plotArea><c:lineChart><c:axId val="1"/><c:axId val="2"/></c:lineChart><c:catAx><c:axId val="1"/></c:catAx><c:valAx><c:axId val="2"/><c:scaling><c:logBase val="10"/><c:orientation val="minMax"/></c:scaling></c:valAx></c:plotArea></c:chart></c:chartSpace>"#;
+        assert_eq!(read_chart_xml(xml).unwrap().y_log_base, Some(10.0));
+    }
+
     #[test]
     fn legend_position_and_overlay_are_read() {
         let legend = r#"<c:legend><c:legendPos val="r"/><c:overlay val="1"/></c:legend>"#;
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 76567c9e..a3cf7042 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -273,6 +273,9 @@ fn axes(w: &mut W, c: &Chart, g: Group) {
     w.open0("c:valAx");
     w.val("c:axId", AX_VAL);
     w.open0("c:scaling");
+    if let Some(b) = c.y_log_base {
+        w.val("c:logBase", fmt_num(b));
+    }
     w.val("c:orientation", "minMax");
     if let Some(m) = c.y_max.filter(|v| v.is_finite()) {
         w.val("c:max", fmt_num(m));
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..6fc482cf 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -249,7 +249,16 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     // As many major units as the value axis has room for labels (PowerPoint's automatic unit).
     let axis_len = if horiz { area.width() - base * 4.5 } else { area.height() - base * 1.8 };
     let max_intervals = (axis_len / if horiz { base * 6.0 } else { base * 1.9 }).floor().clamp(2.0, 12.0) as usize;
-    let (min, max, step) = c.axis_scale(false, max_intervals).unwrap_or_else(|| axis_scale(0.0, 1.0, None, None, None, max_intervals, true));
+    // A logarithmic axis is scaled in exponents of its base.
+    let log = c.log_axis_scale(max_intervals).map(|sc| (c.y_log_base.unwrap_or(10.0), sc));
+    let (min, max, step) = match log {
+        Some((_, sc)) => sc,
+        None => c.axis_scale(false, max_intervals).unwrap_or_else(|| axis_scale(0.0, 1.0, None, None, None, max_intervals, true)),
+    };
+    let to_e = |v: f64| match log {
+        Some((b, _)) => v.max(f64::MIN_POSITIVE).log(b).max(min - 1.0),
+        None => v,
+    };
     // A combo chart's secondary value axis, on the right (vertical value axes only).
     let second = if horiz { None } else { c.axis_scale(true, max_intervals) };
     let ticks = |(lo, hi, st): (f64, f64, f64)| {
@@ -257,8 +266,11 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         (0..=n).map(move |k| lo + k as f64 * st)
     };
     // Label gutters as wide as the longest value label.
-    let label_w =
-        |sec: bool, sc: (f64, f64, f64)| ticks(sc).map(|v| c.axis_label(sec, v).chars().count()).max().unwrap_or(1) as f64 * base * 0.55 + base * 0.6;
+    let primary_ticks: Vec<f64> = ticks((min, max, step)).map(|k| log.map_or(k, |(b, _)| b.powf(k))).collect();
+    let label_w = |sec: bool, sc: (f64, f64, f64)| {
+        let vals: Vec<f64> = if sec { ticks(sc).collect() } else { primary_ticks.clone() };
+        vals.iter().map(|v| c.axis_label(sec, *v).chars().count()).max().unwrap_or(1) as f64 * base * 0.55 + base * 0.6
+    };
     let gutter = if horiz {
         base * 4.5
     } else if c.y_hidden {
@@ -276,14 +288,17 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         crate::paint::fill_path(ctx, rctx, f, None, &plot.to_path(0.1), plot, m, deckcraft_geom::preset::FillMode::Norm, 1.0, rctx.pres);
     }
     let span = (max - min).max(1e-9);
-    let to_v = |v: f64| if horiz { plot.x0 + (v - min) / span * plot.width() } else { plot.y1 - (v - min) / span * plot.height() };
+    let to_v = |v: f64| {
+        let v = to_e(v);
+        if horiz { plot.x0 + (v - min) / span * plot.width() } else { plot.y1 - (v - min) / span * plot.height() }
+    };
     // A series' value as a position on its own axis.
     let to_axis = |sec: bool, v: f64| match (sec, second) {
         (true, Some((min2, max2, _))) => plot.y1 - (v - min2) / (max2 - min2).max(1e-9) * plot.height(),
         _ => to_v(v),
     };
     // Gridlines and value labels.
-    for v in ticks((min, max, step)) {
+    for &v in &primary_ticks {
         let pos = to_v(v);
         let text = if c.y_hidden { String::new() } else { c.axis_label(false, v) };
         let mut g = BezPath::new();
@@ -378,7 +393,10 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             );
         }
     }
-    let zero = to_v(0.0f64.clamp(min, max));
+    let zero = match log {
+        Some((b, _)) => to_v(b.powf(min)),
+        None => to_v(0.0f64.clamp(min, max)),
+    };
     if let Some(bk) = bar_kind {
         let bars: Vec<(usize, &deckcraft_model::chart::Series)> =
             c.series.iter().enumerate().filter(|(_, s)| c.series_kind(s).is_bar_like()).collect();

From 8fde746211adad6ec3adc66789a93188fff08613 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:45:32 +0300
Subject: [PATCH 273/376] Format: never save a .deckcraft that can't be
 reopened over a NaN
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

serde_json writes NaN and infinity as null, which doesn't read back as a number, so one NaN
anywhere in the model (a rotation, position, crop, stroke width…) made the saved file (and its
AutoRecover copy) fail to open as "damaged".

- Writer: presentation.json goes through finite::Finite, a serializer adapter that writes
  non-finite floats as 0.
- Loader: files already written that way open; each null where a number belongs reads as 0
  (inside tagged enums, where serde only reports the enclosing object, candidates are tried
  nearest first and kept only when the parse gets further). Other damage still fails.
- repair() brings shape geometry into range: positions and sizes finite and within ±1e6 pt,
  rotation 0–360, picture crop -10..1, font sizes 1–4000 pt, line widths 0–1584 pt.

Animation timings are u32 and can't carry NaN.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/format/src/finite.rs | 185 +++++++++++++++++++++++++++
 crates/format/src/lib.rs    | 247 +++++++++++++++++++++++++++++++++++-
 2 files changed, 430 insertions(+), 2 deletions(-)
 create mode 100644 crates/format/src/finite.rs

diff --git a/crates/format/src/finite.rs b/crates/format/src/finite.rs
new file mode 100644
index 00000000..834108a3
--- /dev/null
+++ b/crates/format/src/finite.rs
@@ -0,0 +1,185 @@
+//! A serde serializer adapter that writes non-finite floats as 0.
+//!
+//! serde_json writes NaN and ±infinity as `null`, which doesn't read back as a number: a single
+//! NaN anywhere in the model (a rotation, a crop, a stroke width) made a saved file fail to open
+//! as "damaged". [`Finite`] wraps any `Serialize` value and replaces those floats on the way out;
+//! everything else passes through unchanged.
+
+use serde::ser::{self, Serialize, Serializer};
+
+/// `T`, serialized with non-finite floats written as 0.
+pub struct Finite<'a, T: ?Sized>(pub &'a T);
+
+impl<T: ?Sized + Serialize> Serialize for Finite<'_, T> {
+    fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
+        self.0.serialize(Wrap(s))
+    }
+}
+
+struct Wrap<S>(S);
+
+macro_rules! pass {
+    ($($m:ident($t:ty)),* $(,)?) => {
+        $(fn $m(self, v: $t) -> Result<S::Ok, S::Error> { self.0.$m(v) })*
+    };
+}
+
+impl<S: Serializer> Serializer for Wrap<S> {
+    type Ok = S::Ok;
+    type Error = S::Error;
+    type SerializeSeq = Wrap<S::SerializeSeq>;
+    type SerializeTuple = Wrap<S::SerializeTuple>;
+    type SerializeTupleStruct = Wrap<S::SerializeTupleStruct>;
+    type SerializeTupleVariant = Wrap<S::SerializeTupleVariant>;
+    type SerializeMap = Wrap<S::SerializeMap>;
+    type SerializeStruct = Wrap<S::SerializeStruct>;
+    type SerializeStructVariant = Wrap<S::SerializeStructVariant>;
+
+    pass!(
+        serialize_bool(bool),
+        serialize_i8(i8),
+        serialize_i16(i16),
+        serialize_i32(i32),
+        serialize_i64(i64),
+        serialize_i128(i128),
+        serialize_u8(u8),
+        serialize_u16(u16),
+        serialize_u32(u32),
+        serialize_u64(u64),
+        serialize_u128(u128),
+        serialize_char(char),
+        serialize_str(&str),
+        serialize_bytes(&[u8]),
+    );
+
+    fn serialize_f32(self, v: f32) -> Result<S::Ok, S::Error> {
+        self.0.serialize_f32(if v.is_finite() { v } else { 0.0 })
+    }
+    fn serialize_f64(self, v: f64) -> Result<S::Ok, S::Error> {
+        self.0.serialize_f64(if v.is_finite() { v } else { 0.0 })
+    }
+    fn serialize_none(self) -> Result<S::Ok, S::Error> {
+        self.0.serialize_none()
+    }
+    fn serialize_some<T: ?Sized + Serialize>(self, v: &T) -> Result<S::Ok, S::Error> {
+        self.0.serialize_some(&Finite(v))
+    }
+    fn serialize_unit(self) -> Result<S::Ok, S::Error> {
+        self.0.serialize_unit()
+    }
+    fn serialize_unit_struct(self, name: &'static str) -> Result<S::Ok, S::Error> {
+        self.0.serialize_unit_struct(name)
+    }
+    fn serialize_unit_variant(self, name: &'static str, i: u32, variant: &'static str) -> Result<S::Ok, S::Error> {
+        self.0.serialize_unit_variant(name, i, variant)
+    }
+    fn serialize_newtype_struct<T: ?Sized + Serialize>(self, name: &'static str, v: &T) -> Result<S::Ok, S::Error> {
+        self.0.serialize_newtype_struct(name, &Finite(v))
+    }
+    fn serialize_newtype_variant<T: ?Sized + Serialize>(self, name: &'static str, i: u32, variant: &'static str, v: &T) -> Result<S::Ok, S::Error> {
+        self.0.serialize_newtype_variant(name, i, variant, &Finite(v))
+    }
+    fn serialize_seq(self, len: Option<usize>) -> Result<Self::SerializeSeq, S::Error> {
+        self.0.serialize_seq(len).map(Wrap)
+    }
+    fn serialize_tuple(self, len: usize) -> Result<Self::SerializeTuple, S::Error> {
+        self.0.serialize_tuple(len).map(Wrap)
+    }
+    fn serialize_tuple_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeTupleStruct, S::Error> {
+        self.0.serialize_tuple_struct(name, len).map(Wrap)
+    }
+    fn serialize_tuple_variant(self, name: &'static str, i: u32, variant: &'static str, len: usize) -> Result<Self::SerializeTupleVariant, S::Error> {
+        self.0.serialize_tuple_variant(name, i, variant, len).map(Wrap)
+    }
+    fn serialize_map(self, len: Option<usize>) -> Result<Self::SerializeMap, S::Error> {
+        self.0.serialize_map(len).map(Wrap)
+    }
+    fn serialize_struct(self, name: &'static str, len: usize) -> Result<Self::SerializeStruct, S::Error> {
+        self.0.serialize_struct(name, len).map(Wrap)
+    }
+    fn serialize_struct_variant(
+        self,
+        name: &'static str,
+        i: u32,
+        variant: &'static str,
+        len: usize,
+    ) -> Result<Self::SerializeStructVariant, S::Error> {
+        self.0.serialize_struct_variant(name, i, variant, len).map(Wrap)
+    }
+    fn is_human_readable(&self) -> bool {
+        self.0.is_human_readable()
+    }
+}
+
+macro_rules! compound {
+    ($tr:ident, $m:ident) => {
+        impl<S: ser::$tr> ser::$tr for Wrap<S> {
+            type Ok = S::Ok;
+            type Error = S::Error;
+            fn $m<T: ?Sized + Serialize>(&mut self, v: &T) -> Result<(), S::Error> {
+                self.0.$m(&Finite(v))
+            }
+            fn end(self) -> Result<S::Ok, S::Error> {
+                self.0.end()
+            }
+        }
+    };
+}
+compound!(SerializeSeq, serialize_element);
+compound!(SerializeTuple, serialize_element);
+compound!(SerializeTupleStruct, serialize_field);
+compound!(SerializeTupleVariant, serialize_field);
+
+impl<S: ser::SerializeMap> ser::SerializeMap for Wrap<S> {
+    type Ok = S::Ok;
+    type Error = S::Error;
+    fn serialize_key<T: ?Sized + Serialize>(&mut self, k: &T) -> Result<(), S::Error> {
+        self.0.serialize_key(&Finite(k))
+    }
+    fn serialize_value<T: ?Sized + Serialize>(&mut self, v: &T) -> Result<(), S::Error> {
+        self.0.serialize_value(&Finite(v))
+    }
+    fn end(self) -> Result<S::Ok, S::Error> {
+        self.0.end()
+    }
+}
+
+macro_rules! fields {
+    ($tr:ident) => {
+        impl<S: ser::$tr> ser::$tr for Wrap<S> {
+            type Ok = S::Ok;
+            type Error = S::Error;
+            fn serialize_field<T: ?Sized + Serialize>(&mut self, key: &'static str, v: &T) -> Result<(), S::Error> {
+                self.0.serialize_field(key, &Finite(v))
+            }
+            fn skip_field(&mut self, key: &'static str) -> Result<(), S::Error> {
+                self.0.skip_field(key)
+            }
+            fn end(self) -> Result<S::Ok, S::Error> {
+                self.0.end()
+            }
+        }
+    };
+}
+fields!(SerializeStruct);
+fields!(SerializeStructVariant);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn non_finite_floats_are_written_as_zero_and_nothing_else_changes() {
+        #[derive(serde::Serialize)]
+        struct T {
+            a: f64,
+            b: Option<f64>,
+            c: Vec<(f32, f64)>,
+            d: Option<String>,
+            e: std::collections::BTreeMap<String, f64>,
+        }
+        let t = T { a: f64::NAN, b: Some(f64::INFINITY), c: vec![(f32::NEG_INFINITY, 1.5)], d: None, e: [("k".to_string(), f64::NAN)].into() };
+        let s = serde_json::to_string(&Finite(&t)).unwrap_or_default();
+        assert_eq!(s, r#"{"a":0.0,"b":0.0,"c":[[0.0,1.5]],"d":null,"e":{"k":0.0}}"#);
+    }
+}
diff --git a/crates/format/src/lib.rs b/crates/format/src/lib.rs
index 1b37a232..9af576f0 100644
--- a/crates/format/src/lib.rs
+++ b/crates/format/src/lib.rs
@@ -4,6 +4,8 @@
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
 
+mod finite;
+
 use std::io::{Cursor, Read, Write};
 use std::sync::Arc;
 
@@ -55,7 +57,7 @@ pub fn save(p: &Presentation) -> Result<Vec<u8>> {
             generator: format!("DeckCraft {}", env!("CARGO_PKG_VERSION")),
             presentation: p.clone(),
         };
-        let json = serde_json::to_vec(&m).map_err(|e| FormatError::Write(e.to_string()))?;
+        let json = serde_json::to_vec(&finite::Finite(&m)).map_err(|e| FormatError::Write(e.to_string()))?;
         z.start_file("presentation.json", deflate).map_err(w)?;
         z.write_all(&json).map_err(|e| FormatError::Write(e.to_string()))?;
         for item in &p.media {
@@ -100,7 +102,7 @@ fn read_entry(z: &mut zip::ZipArchive<Cursor<&[u8]>>, name: &str) -> Result<Vec<
 pub fn load(bytes: &[u8]) -> Result<Presentation> {
     let mut z = zip::ZipArchive::new(Cursor::new(bytes)).map_err(|e| FormatError::NotOurs(e.to_string()))?;
     let json = read_entry(&mut z, "presentation.json").map_err(|_| FormatError::NotOurs("no presentation.json".into()))?;
-    let m: Manifest = serde_json::from_slice(&json).map_err(|e| FormatError::Damaged(e.to_string()))?;
+    let m = parse_manifest(&json)?;
     if m.format != "deckcraft" {
         return Err(FormatError::NotOurs(m.format));
     }
@@ -145,6 +147,162 @@ pub fn repair(p: &mut Presentation) {
     }
     p.slide_size.width = p.slide_size.width.min(4000.0);
     p.slide_size.height = p.slide_size.height.min(4000.0);
+    sane_numbers(p);
+}
+
+/// Most `null`s standing in for numbers that [`parse_manifest`] patches in one file, and the
+/// candidates it tries for each.
+const MAX_NULL_FIXES: usize = 256;
+const MAX_TRIES_PER_FIX: usize = 32;
+
+/// Where a parse failed, comparable: later is progress.
+fn failure(src: &[u8]) -> std::result::Result<Manifest, (String, (usize, usize))> {
+    serde_json::from_slice::<Manifest>(src).map_err(|e| (e.to_string(), (e.line(), e.column())))
+}
+
+/// Parse `presentation.json`. serde_json writes a NaN or infinite number as `null`, which then
+/// fails to read back as a number ("invalid type: null, expected f64"), so DeckCraft could save
+/// a file it couldn't open. Each such `null` is read as 0 instead ([`repair`] then brings the
+/// value into range); anything else that doesn't parse is damage.
+///
+/// serde reports the failing `null` exactly, except inside tagged enums (buffered), where it
+/// reports the end of the enclosing object: there the `null`s before that point are tried
+/// nearest first, and a patch is kept only if the parse then gets further. (Files saved since
+/// [`finite::Finite`] never contain such `null`s; this reads older ones.)
+fn parse_manifest(json: &[u8]) -> Result<Manifest> {
+    let mut src = json.to_vec();
+    let mut last = match failure(&src) {
+        Ok(m) => return Ok(m),
+        Err(f) => f,
+    };
+    for _ in 0..MAX_NULL_FIXES {
+        let (msg, pos) = &last;
+        let number = msg.starts_with("invalid type: null, expected f") || msg.starts_with("invalid type: null, expected a number");
+        if !number {
+            break;
+        }
+        let end = offset(&src, pos.0, pos.1).unwrap_or(src.len());
+        let mut progressed = false;
+        let candidates: Vec<usize> = value_nulls_before(&src, end + 4).take(MAX_TRIES_PER_FIX).collect();
+        for at in candidates {
+            let mut next = Vec::with_capacity(src.len());
+            next.extend_from_slice(&src[..at]);
+            next.push(b'0');
+            next.extend_from_slice(&src[at + 4..]);
+            match failure(&next) {
+                Ok(m) => return Ok(m),
+                // The patch shortened the text by 3 bytes before the error: compare positions
+                // allowing for that.
+                Err(f) if f.1 > (pos.0, pos.1.saturating_sub(3)) => {
+                    src = next;
+                    last = f;
+                    progressed = true;
+                    break;
+                }
+                Err(_) => {}
+            }
+        }
+        if !progressed {
+            break;
+        }
+    }
+    Err(FormatError::Damaged(last.0))
+}
+
+/// Byte offset of a 1-based `line`:`column`.
+fn offset(src: &[u8], line: usize, column: usize) -> Option<usize> {
+    let mut start = 0;
+    for _ in 1..line {
+        start += src.get(start..)?.iter().position(|b| *b == b'\n')? + 1;
+    }
+    Some((start + column).min(src.len()))
+}
+
+/// Starts of `null` tokens in value position (after `:`, `[` or `,`) before `end`, nearest first.
+fn value_nulls_before(src: &[u8], end: usize) -> impl Iterator<Item = usize> + '_ {
+    let end = end.min(src.len());
+    (0..end.saturating_sub(3)).rev().filter(move |&i| {
+        src.get(i..i + 4) == Some(b"null")
+            && src[..i].iter().rev().find(|b| !b.is_ascii_whitespace()).is_some_and(|b| matches!(b, b':' | b'[' | b','))
+            && src.get(i + 4).is_none_or(|b| !b.is_ascii_alphanumeric())
+    })
+}
+
+/// Largest coordinate or size kept, in points (about 350 m; PowerPoint's own limit is far smaller).
+const MAX_COORD: f64 = 1.0e6;
+
+/// Numbers no view can draw or no file should keep: non-finite positions, sizes and angles become
+/// 0, huge ones are clamped, angles are brought into 0–360, crops into a sane range, font sizes
+/// into 1–4000 pt and line widths into 0–1584 pt (PowerPoint's limits).
+fn sane_xfrm(x: &mut deckcraft_model::Xfrm) {
+    let fin = |v: f64| if v.is_finite() { v } else { 0.0 };
+    x.x = fin(x.x).clamp(-MAX_COORD, MAX_COORD);
+    x.y = fin(x.y).clamp(-MAX_COORD, MAX_COORD);
+    x.w = fin(x.w).clamp(0.0, MAX_COORD);
+    x.h = fin(x.h).clamp(0.0, MAX_COORD);
+    x.rot = fin(x.rot).rem_euclid(360.0);
+    if x.rot >= 360.0 {
+        x.rot = 0.0;
+    }
+}
+
+fn sane_run(p: &mut deckcraft_model::text::RunProps) {
+    p.size = p.size.filter(|v| v.is_finite() && *v > 0.0).map(|v| v.clamp(1.0, 4000.0));
+}
+
+fn sane_shapes(shapes: &mut [deckcraft_model::Shape], depth: usize) {
+    if depth > 64 {
+        return;
+    }
+    for sh in shapes {
+        if let Some(x) = sh.xfrm.as_mut() {
+            sane_xfrm(x);
+        }
+        if let Some(l) = sh.line.as_mut() {
+            l.width = l.width.filter(|v| v.is_finite() && *v >= 0.0).map(|v| v.min(1584.0));
+        }
+        if let Some(t) = sh.text.as_mut() {
+            for para in &mut t.paragraphs {
+                sane_run(&mut para.end_props);
+                for r in &mut para.runs {
+                    sane_run(&mut r.props);
+                }
+            }
+        }
+        match &mut sh.kind {
+            deckcraft_model::ShapeKind::Picture { fill } => {
+                for c in &mut fill.crop {
+                    *c = if c.is_finite() { c.clamp(-10.0, 1.0) } else { 0.0 };
+                }
+            }
+            deckcraft_model::ShapeKind::Group { children, child } => {
+                sane_xfrm(child);
+                sane_shapes(children, depth + 1);
+            }
+            _ => {}
+        }
+    }
+}
+
+/// [`sane_shapes`] over every slide, layout and master; slides are only copied when they change.
+pub fn sane_numbers(p: &mut Presentation) {
+    for slide in &mut p.slides {
+        let mut fixed = (**slide).clone();
+        sane_shapes(&mut fixed.shapes, 0);
+        if fixed != **slide {
+            *slide = Arc::new(fixed);
+        }
+    }
+    for m in p.masters.iter_mut().chain(p.notes_master.iter_mut()).chain(p.handout_master.iter_mut()) {
+        let mut fixed = (**m).clone();
+        sane_shapes(&mut fixed.shapes, 0);
+        for l in &mut fixed.layouts {
+            sane_shapes(&mut l.shapes, 0);
+        }
+        if fixed != **m {
+            *m = Arc::new(fixed);
+        }
+    }
 }
 
 /// Outline text: one slide per unindented line; tab-indented lines become body bullets at their
@@ -241,6 +399,91 @@ mod tests {
         assert!(load(&b).is_err());
     }
 
+    /// Non-finite numbers are written as `null` by serde_json; the file still opens, with each
+    /// such number repaired (it failed as "invalid type: null, expected f64").
+    #[test]
+    fn a_file_saved_with_non_finite_numbers_reopens() {
+        use deckcraft_model::{Shape, ShapeKind, Xfrm};
+        let mut p = Presentation::default();
+        let nan = f64::NAN;
+        let inf = f64::INFINITY;
+        let mut pic = Shape { xfrm: Some(Xfrm { x: nan, y: -inf, w: 1e300, h: -4.0, rot: 725.0, ..Default::default() }), ..Default::default() };
+        pic.kind = ShapeKind::Picture { fill: deckcraft_model::style::PictureFill { crop: [nan, inf, 0.25, -1e9], ..Default::default() } };
+        pic.line = Some(deckcraft_model::Line { width: Some(1e9), ..Default::default() });
+        let mut text = Shape { xfrm: Some(Xfrm { rot: inf, w: 100.0, h: 50.0, ..Default::default() }), ..Default::default() };
+        let mut body = deckcraft_model::text::TextBody::default();
+        let mut para = deckcraft_model::text::Paragraph::default();
+        para.runs.push(deckcraft_model::text::Run::with("x", deckcraft_model::text::RunProps { size: Some(-3.0), ..Default::default() }));
+        para.end_props.size = Some(1e9);
+        body.paragraphs.push(para);
+        text.text = Some(body);
+        let group = Shape {
+            xfrm: Some(Xfrm { w: 10.0, h: 10.0, ..Default::default() }),
+            kind: ShapeKind::Group { children: vec![pic, text], child: Xfrm { x: nan, w: inf, h: 10.0, ..Default::default() } },
+            ..Default::default()
+        };
+        Arc::make_mut(&mut p.slides[0]).shapes.push(group);
+        let bytes = save(&p).unwrap();
+        let back = load(&bytes).unwrap_or_else(|e| panic!("{e}"));
+        let g = back.slides[0].shapes.last().unwrap();
+        let ShapeKind::Group { children, child } = &g.kind else { panic!("group") };
+        assert_eq!((child.x, child.w), (0.0, 0.0));
+        let x = children[0].xfrm.unwrap();
+        assert_eq!((x.x, x.y, x.w, x.h, x.rot), (0.0, 0.0, MAX_COORD, 0.0, 5.0));
+        let ShapeKind::Picture { fill } = &children[0].kind else { panic!("picture") };
+        assert_eq!(fill.crop, [0.0, 0.0, 0.25, -10.0]);
+        assert_eq!(children[0].line.as_ref().unwrap().width, Some(1584.0));
+        assert_eq!(children[1].xfrm.unwrap().rot, 0.0);
+        let para = &children[1].text.as_ref().unwrap().paragraphs[0];
+        assert_eq!(para.runs[0].props.size, None);
+        assert_eq!(para.end_props.size, Some(4000.0));
+        // Saved again, it is clean.
+        assert_eq!(load(&save(&back).unwrap()).unwrap(), back);
+    }
+
+    /// Files written before [`finite::Finite`] (plain serde_json: NaN as `null`) open too,
+    /// including a `null` inside a tagged enum, where serde reports only the enclosing object.
+    #[test]
+    fn older_files_with_null_numbers_open() {
+        use deckcraft_model::{Shape, ShapeKind, Xfrm};
+        let nan = f64::NAN;
+        for case in 0..3 {
+            let mut p = Presentation::default();
+            let sh = match case {
+                0 => Shape { xfrm: Some(Xfrm { x: nan, rot: nan, w: 5.0, h: 5.0, ..Default::default() }), ..Default::default() },
+                1 => Shape {
+                    kind: ShapeKind::Group { children: vec![], child: Xfrm { x: nan, w: 1.0, h: 1.0, ..Default::default() } },
+                    ..Default::default()
+                },
+                _ => Shape {
+                    kind: ShapeKind::Picture { fill: deckcraft_model::style::PictureFill { crop: [0.1, nan, 0.0, 0.0], ..Default::default() } },
+                    ..Default::default()
+                },
+            };
+            Arc::make_mut(&mut p.slides[0]).shapes.push(sh);
+            let m = Manifest { format: "deckcraft".into(), version: VERSION, generator: "old".into(), presentation: p };
+            let json = serde_json::to_vec(&m).unwrap();
+            assert!(json.windows(4).any(|w| w == b"null"));
+            let back = parse_manifest(&json).unwrap_or_else(|e| panic!("case {case}: {e}"));
+            assert_eq!(back.presentation.slides[0].shapes.len(), m.presentation.slides[0].shapes.len(), "case {case}");
+        }
+    }
+
+    /// Only `null`s where numbers belong are patched: other damage still fails.
+    #[test]
+    fn other_damage_is_still_reported() {
+        let ok = serde_json::to_vec(&serde_json::json!({"format": "deckcraft", "version": 1, "generator": "t", "presentation": {}})).unwrap();
+        assert!(parse_manifest(&ok).is_ok());
+        let bad = br#"{"format": null, "version": 1, "generator": "t", "presentation": {}}"#;
+        assert!(parse_manifest(bad).is_err());
+        let truncated = &ok[..ok.len() - 3];
+        assert!(parse_manifest(truncated).is_err());
+        // A null number on a later line (pretty-printed by another tool) is found too.
+        let pretty = b"{\n  \"format\": \"deckcraft\",\n  \"version\": 1,\n  \"generator\": \"t\",\n  \"presentation\": {\"slides\": [{\"shapes\": [{\"xfrm\": {\"x\": null, \"y\": 1, \"w\": 2, \"h\": 3}}]}]}\n}";
+        let m = parse_manifest(pretty).unwrap_or_else(|e| panic!("{e}"));
+        assert_eq!(m.presentation.slides[0].shapes[0].xfrm.unwrap().x, 0.0);
+    }
+
     #[test]
     fn repair_fixes_missing_layout_and_size() {
         let mut p = Presentation::default();

From 679ce03da47704ccb747cd3da7d4149fd5f0562f Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:47:09 +0300
Subject: [PATCH 274/376] Show: a first animation set to With/After Previous
 plays when the slide appears (#631)

---
 crates/ui-egui/src/show.rs | 49 +++++++++++++++++++++++++++++++++-----
 1 file changed, 43 insertions(+), 6 deletions(-)

diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..02d59abb 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -168,13 +168,13 @@ impl Show {
     }
 
     /// On entering a slide: auto-play its first step when it begins With/After Previous.
+    /// `ShowState` already starts such a step when it enters the slide (#631: asking it for the
+    /// next step again finished the step at once, so the slide appeared fully built), so only
+    /// its clock starts here. Autoplay previews start an On Click first step themselves.
     fn after_enter(&mut self, doc: &Presentation, now: f64) {
-        let auto = self.timeline(doc).step_is_auto(0);
-        if auto || self.autoplay {
-            let a = self.state.next(doc);
-            if matches!(a, ShowAction::PlayStep(_)) {
-                self.step_start = now;
-            }
+        let started = self.state.playing || (self.autoplay && matches!(self.state.next(doc), ShowAction::PlayStep(_)));
+        if started {
+            self.step_start = now;
         }
     }
 }
@@ -885,4 +885,41 @@ mod tests {
         assert_eq!(tr.from, Some(0));
         assert!(show.tex.is_none(), "the new slide gets a texture of its own instead of overwriting the old one");
     }
+
+    fn deck_with_first_animation(start: deckcraft_model::anim::AnimStart) -> Presentation {
+        let mut s = deckcraft_engine::Session::with_new();
+        s.execute("slide.new", &json!({})).unwrap();
+        let mut doc = Presentation::clone(&s.active().unwrap().doc);
+        let slide = std::sync::Arc::make_mut(&mut doc.slides[1]);
+        let shape = slide.shapes[0].id;
+        slide.animations = vec![deckcraft_model::anim::Animation { shape, start, duration_ms: 3000, ..Default::default() }];
+        doc
+    }
+
+    #[test]
+    fn a_first_animation_after_or_with_previous_plays_when_the_slide_appears() {
+        // #631: it was started twice and the second start finished it, so the slide appeared
+        // fully built.
+        use deckcraft_model::anim::AnimStart;
+        for start in [AnimStart::AfterPrevious, AnimStart::WithPrevious] {
+            let doc = deck_with_first_animation(start);
+            // Starting the show on the slide.
+            let mut show = Show::new(&doc, 1, false, false);
+            show.after_enter(&doc, 5.0);
+            assert_eq!((show.state.step, show.state.playing), (0, true), "{start:?} from the start");
+            assert_eq!(show.step_start, 5.0);
+            // Arriving from the slide before.
+            let mut show = Show::new(&doc, 0, false, false);
+            let a = show.state.next(&doc);
+            assert!(matches!(a, ShowAction::Slide(1)));
+            assert!(show.apply(a, &doc, 7.0));
+            assert_eq!((show.state.step, show.state.playing), (0, true), "{start:?} on arrival");
+        }
+        // On Click still waits for the click.
+        let doc = deck_with_first_animation(AnimStart::OnClick);
+        let mut show = Show::new(&doc, 1, false, false);
+        show.after_enter(&doc, 5.0);
+        assert_eq!((show.state.step, show.state.playing), (0, false));
+        assert!(matches!(show.state.next(&doc), ShowAction::PlayStep(0)));
+    }
 }

From 3ea696dc1a27720df03a9c93b1249971dc47e50e Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:48:33 +0300
Subject: [PATCH 275/376] Charts: read, write and draw error bars

---
 crates/model/src/chart.rs      | 66 ++++++++++++++++++++++++++++++++++
 crates/pptx/src/read/chart.rs  | 25 ++++++++++++-
 crates/pptx/src/write/chart.rs | 36 +++++++++++++++++++
 crates/render/src/chart.rs     | 31 ++++++++++++++++
 4 files changed, 157 insertions(+), 1 deletion(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index aebee497..ac6156b1 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -138,6 +138,55 @@ pub struct Series {
     /// source data's.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub number_format: Option<String>,
+    /// `c:errBars` on the values (y bars; a bar chart's run along its value axis).
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error_bars: Option<ErrorBars>,
+}
+
+/// Error bars (`c:errBars`): how far each point's bar reaches below and above it.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+#[serde(default, rename_all = "camelCase")]
+pub struct ErrorBars {
+    /// `both`, `plus` or `minus`.
+    pub bar_type: String,
+    /// `fixedVal`, `percentage`, `stdDev`, `stdErr` or `cust`.
+    pub val_type: String,
+    pub value: f64,
+    /// `cust`: the per-point plus and minus amounts.
+    pub plus: Vec<Option<f64>>,
+    pub minus: Vec<Option<f64>>,
+    pub end_cap: bool,
+}
+
+impl Default for ErrorBars {
+    fn default() -> Self {
+        ErrorBars { bar_type: "both".into(), val_type: "fixedVal".into(), value: 1.0, plus: vec![], minus: vec![], end_cap: true }
+    }
+}
+
+impl ErrorBars {
+    /// Where point `i` (value `v`) of a series with `values` has its bar: (low, high) in data units.
+    /// Standard deviation bars stand around the series' mean, as Excel draws them; the others
+    /// around the point. `None` for an amount that isn't a finite number.
+    pub fn range(&self, values: &[Option<f64>], i: usize, v: f64) -> Option<(f64, f64)> {
+        let vals: Vec<f64> = values.iter().flatten().copied().filter(|v| v.is_finite()).collect();
+        let n = vals.len() as f64;
+        let mean = vals.iter().sum::<f64>() / n.max(1.0);
+        let sd = if n > 1.0 { (vals.iter().map(|x| (x - mean).powi(2)).sum::<f64>() / (n - 1.0)).sqrt() } else { 0.0 };
+        let (centre, minus, plus) = match self.val_type.as_str() {
+            "percentage" => (v, (v * self.value / 100.0).abs(), (v * self.value / 100.0).abs()),
+            "stdDev" => (mean, sd * self.value, sd * self.value),
+            "stdErr" => (v, sd / n.max(1.0).sqrt(), sd / n.max(1.0).sqrt()),
+            "cust" => (v, self.minus.get(i).copied().flatten().unwrap_or(0.0), self.plus.get(i).copied().flatten().unwrap_or(0.0)),
+            _ => (v, self.value, self.value),
+        };
+        let (lo, hi) = match self.bar_type.as_str() {
+            "plus" => (centre, centre + plus),
+            "minus" => (centre - minus, centre),
+            _ => (centre - minus, centre + plus),
+        };
+        (lo.is_finite() && hi.is_finite()).then_some((lo, hi))
+    }
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
@@ -431,6 +480,23 @@ pub fn nice_scale(lo: f64, hi: f64) -> (f64, f64, f64) {
 mod tests {
     use super::*;
 
+    #[test]
+    fn error_bar_ranges() {
+        let vals = [Some(3.0), Some(5.0), Some(2.0), Some(4.0)];
+        let mut e = ErrorBars::default();
+        assert_eq!(e.range(&vals, 0, 3.0), Some((2.0, 4.0)));
+        e.val_type = "percentage".into();
+        e.value = 20.0;
+        assert_eq!(e.range(&vals, 1, 5.0), Some((4.0, 6.0)));
+        e.bar_type = "plus".into();
+        assert_eq!(e.range(&vals, 1, 5.0), Some((5.0, 6.0)));
+        e = ErrorBars { val_type: "cust".into(), plus: vec![Some(0.5)], minus: vec![Some(1.5)], ..Default::default() };
+        assert_eq!(e.range(&vals, 0, 3.0), Some((1.5, 3.5)));
+        e = ErrorBars { val_type: "stdDev".into(), ..Default::default() };
+        let (lo, hi) = e.range(&vals, 0, 3.0).unwrap();
+        assert!((lo + hi - 7.0).abs() < 1e-9 && (hi - lo - 2.0 * 1.2909944487358056).abs() < 1e-9);
+    }
+
     #[test]
     fn nice_scale_covers() {
         let (a, b, s) = nice_scale(0.0, 5.1);
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index 6d7541ff..6234df23 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -1,6 +1,6 @@
 //! Chart parts (`c:chartSpace`) → [`Chart`]. The original XML is kept in `Chart.raw`.
 
-use deckcraft_model::chart::{Chart, ChartType, Series};
+use deckcraft_model::chart::{Chart, ChartType, ErrorBars, Series};
 use deckcraft_model::style::Fill;
 
 use crate::xml::El;
@@ -229,6 +229,21 @@ pub(crate) fn chart_from(root: &El) -> Option<Chart> {
             if let Some(v) = s.child("val").or_else(|| s.child("yVal")) {
                 ser.values = numbers(v);
             }
+            // Error bars on the values: a scatter chart's y bars, any other chart's only ones.
+            if let Some(e) = s
+                .children_named("errBars")
+                .find(|e| e.child_val("errDir").is_none_or(|d| d == "y" || !matches!(kind, ChartType::Scatter | ChartType::Bubble)))
+            {
+                let d = ErrorBars::default();
+                ser.error_bars = Some(ErrorBars {
+                    bar_type: e.child_val("errBarType").unwrap_or("both").to_string(),
+                    val_type: e.child_val("errValType").unwrap_or("fixedVal").to_string(),
+                    value: e.child_val("val").and_then(|v| v.parse().ok()).filter(|v: &f64| v.is_finite()).unwrap_or(d.value),
+                    plus: e.child("plus").map(numbers).unwrap_or_default(),
+                    minus: e.child("minus").map(numbers).unwrap_or_default(),
+                    end_cap: e.child("noEndCap").and_then(|v| v.bool("val")) != Some(true),
+                });
+            }
             if let Some(b) = s.child("bubbleSize") {
                 ser.sizes = numbers(b);
             }
@@ -310,6 +325,14 @@ fn text_size(e: Option<&El>) -> Option<f64> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn error_bars_are_read() {
+        let xml = br#"<c:chartSpace xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart"><c:chart><c:plotArea><c:barChart><c:barDir val="col"/><c:ser><c:idx val="0"/><c:errBars><c:errBarType val="plus"/><c:errValType val="percentage"/><c:noEndCap val="1"/><c:val val="20"/></c:errBars><c:val><c:numLit><c:ptCount val="1"/><c:pt idx="0"><c:v>5</c:v></c:pt></c:numLit></c:val></c:ser></c:barChart></c:plotArea></c:chart></c:chartSpace>"#;
+        let c = read_chart_xml(xml).unwrap();
+        let e = c.series[0].error_bars.clone().unwrap();
+        assert_eq!((e.bar_type.as_str(), e.val_type.as_str(), e.value, e.end_cap), ("plus", "percentage", 20.0, false));
+    }
+
     #[test]
     fn legend_position_and_overlay_are_read() {
         let legend = r#"<c:legend><c:legendPos val="r"/><c:overlay val="1"/></c:legend>"#;
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 76567c9e..b9ab714b 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -108,6 +108,20 @@ fn num_cache(w: &mut W, f: &str, vals: &[Option<f64>]) {
     w.close("c:numRef");
 }
 
+/// Numbers written into the chart itself (`c:numLit`), with no worksheet range behind them.
+fn num_lit(w: &mut W, vals: &[Option<f64>]) {
+    w.open0("c:numLit");
+    w.val("c:ptCount", vals.len());
+    for (i, v) in vals.iter().enumerate() {
+        if let Some(v) = v.filter(|v| v.is_finite()) {
+            w.open("c:pt", A::new().a("idx", i));
+            w.elt("c:v", &fmt_num(v));
+            w.close("c:pt");
+        }
+    }
+    w.close("c:numLit");
+}
+
 #[derive(Clone, Copy, PartialEq)]
 enum Group {
     Bar,
@@ -176,6 +190,28 @@ fn series(w: &mut W, c: &Chart, s: &Series, i: usize, kind: ChartType, g: Group)
     }
     let n = c.categories.len().max(s.values.len());
     let last = n + 1;
+    if let Some(e) = &s.error_bars {
+        let word = |v: &str, ok: &[&'static str], d: &'static str| ok.iter().copied().find(|o| *o == v).unwrap_or(d);
+        w.open0("c:errBars");
+        if matches!(g, Group::Scatter | Group::Bubble) {
+            w.val("c:errDir", "y");
+        }
+        w.val("c:errBarType", word(&e.bar_type, &["both", "plus", "minus"], "both"));
+        let vt = word(&e.val_type, &["fixedVal", "percentage", "stdDev", "stdErr", "cust"], "fixedVal");
+        w.val("c:errValType", vt);
+        w.val("c:noEndCap", if e.end_cap { 0 } else { 1 });
+        if vt == "cust" {
+            w.open0("c:plus");
+            num_lit(w, &e.plus);
+            w.close("c:plus");
+            w.open0("c:minus");
+            num_lit(w, &e.minus);
+            w.close("c:minus");
+        } else if e.value.is_finite() {
+            w.val("c:val", fmt_num(e.value));
+        }
+        w.close("c:errBars");
+    }
     if matches!(g, Group::Scatter | Group::Bubble) {
         let xs: Vec<Option<f64>> = if s.x_values.is_empty() { (1..=s.values.len()).map(|v| Some(v as f64)).collect() } else { s.x_values.clone() };
         w.open0("c:xVal");
diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..f6805c65 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -379,6 +379,8 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
         }
     }
     let zero = to_v(0.0f64.clamp(min, max));
+    // Error bars, drawn over every series: (position across the value axis, from, to, cap length, cap).
+    let mut err_marks: Vec<(f64, f64, f64, f64, bool)> = vec![];
     if let Some(bk) = bar_kind {
         let bars: Vec<(usize, &deckcraft_model::chart::Series)> =
             c.series.iter().enumerate().filter(|(_, s)| c.series_kind(s).is_bar_like()).collect();
@@ -420,6 +422,13 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                 ctx.set_transform(m);
                 ctx.set_paint(color(series_fill(rctx, c, *si, Some(s)), 1.0));
                 ctx.fill_rect(&r.abs());
+                if let Some(e) = &s.error_bars {
+                    let (end, mid) = if horiz { (if v >= 0.0 { b } else { a }, r.center().y) } else { (if v >= 0.0 { b } else { a }, r.center().x) };
+                    if let Some((lo, hi)) = e.range(&s.values, i, end) {
+                        let (p0, p1) = if horiz { (to_v(lo), to_v(hi)) } else { (to_axis(sec, lo), to_axis(sec, hi)) };
+                        err_marks.push((mid, p0, p1, bar.min(base * 0.8) * 0.5, e.end_cap));
+                    }
+                }
                 if c.data_labels {
                     let t = c.data_label(s, s.values.get(i).copied().flatten().unwrap_or(0.0));
                     let lr = if horiz {
@@ -475,6 +484,9 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
                 }
                 _ => plot.x0 + band * (i as f64 + 0.5),
             };
+            if let Some((lo, hi)) = s.error_bars.as_ref().and_then(|e| e.range(&s.values, i, v)) {
+                err_marks.push((x, to_axis(sec, lo), to_axis(sec, hi), base * 0.4, s.error_bars.as_ref().is_some_and(|e| e.end_cap)));
+            }
             pts.push(Point::new(x, to_axis(sec, v)));
         }
         if pts.is_empty() {
@@ -511,6 +523,25 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             }
         }
     }
+    if !err_marks.is_empty() {
+        let mut p = BezPath::new();
+        for &(mid, a, b, cap, end_cap) in &err_marks {
+            // A horizontal bar chart's error bars run across, its value axis being horizontal.
+            let pt = |along: f64, across: f64| if horiz { Point::new(along, across) } else { Point::new(across, along) };
+            p.move_to(pt(a, mid));
+            p.line_to(pt(b, mid));
+            if end_cap {
+                for e in [a, b] {
+                    p.move_to(pt(e, mid - cap));
+                    p.line_to(pt(e, mid + cap));
+                }
+            }
+        }
+        ctx.set_transform(m);
+        ctx.set_paint(color(text_col, 1.0));
+        ctx.set_stroke(kurbo::Stroke::new(0.75));
+        ctx.stroke_path(&p);
+    }
     // Axis line.
     let mut ax = BezPath::new();
     if horiz {

From 9f5de924ad29f5c0aad8e853b00ae6315cafd419 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:53:21 +0300
Subject: [PATCH 276/376] View: Zoom dialog applies a percent or Fit
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The dialog waits for OK. View ▸ Zoom opens it, and the arrow keeps the preset list.
---
 ROADMAP.md                    |  4 +-
 crates/ui-egui/src/dialogs.rs | 96 ++++++++++++++++++++++++++++++-----
 crates/ui-egui/src/lib.rs     |  4 +-
 crates/ui-egui/src/menus.rs   |  1 +
 crates/ui-egui/src/ribbon.rs  | 24 ++++++---
 crates/ui-egui/src/status.rs  |  2 +-
 docs/roadmap.md               |  3 +-
 docs/target-app-parity.md     |  7 +--
 docs/ui-parity.md             |  5 +-
 9 files changed, 118 insertions(+), 28 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..db627fa9 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Zoom dialog; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | View: the Zoom dialog takes a percent or Fit and applies it on OK. View ▸ Zoom opens it; the arrow still lists the presets |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Zoom dialog |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..a73454d9 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -117,6 +117,67 @@ fn num(d: &mut Dialog, key: &str, default: f64) -> f64 {
     d.get(key, "").trim().trim_end_matches(['"', '%', ' ']).parse::<f64>().ok().filter(|v| v.is_finite()).unwrap_or(default)
 }
 
+/// Preset percents in the Zoom dialog, largest first.
+const ZOOM_PRESETS: &[u32] = &[400, 200, 150, 100, 75, 66, 50, 33];
+
+/// A typed zoom percent as a scale in `0.1..=4` (10%–400%). `None` when it is not a finite number.
+pub fn parse_zoom_percent(text: &str) -> Option<f32> {
+    let t = text.trim().trim_end_matches('%').trim();
+    if t.is_empty() {
+        return None;
+    }
+    let v = t.parse::<f64>().ok().filter(|n| n.is_finite())?;
+    Some(((v / 100.0) as f32).clamp(0.1, 4.0))
+}
+
+/// Zoom dialog: a percent or Fit. Nothing changes until OK.
+fn zoom_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    if !d.fields.contains_key("mode") {
+        let shown = app.ui.zoom.unwrap_or(app.canvas_scale);
+        let pct = if shown.is_finite() { (shown * 100.0).round().clamp(10.0, 400.0) } else { 100.0 };
+        d.fields.insert("mode".into(), if app.ui.zoom.is_none() { "fit".into() } else { "percent".into() });
+        d.fields.insert("percent".into(), format!("{pct:.0}"));
+    }
+    let mut mode = d.get("mode", "percent");
+    let mut percent = d.get("percent", "100");
+    ui.label("Zoom to");
+    if ui.radio(mode == "fit", "Fit").clicked() {
+        mode = "fit".into();
+    }
+    for pct in ZOOM_PRESETS {
+        let on = mode == "percent" && percent == pct.to_string();
+        if ui.radio(on, format!("{pct}%")).clicked() {
+            mode = "percent".into();
+            percent = pct.to_string();
+        }
+    }
+    ui.horizontal(|ui| {
+        ui.label("Percent:");
+        let edit = ui.add(egui::TextEdit::singleline(&mut percent).desired_width(72.0));
+        if edit.changed() {
+            mode = "percent".into();
+        }
+        ui.label("%");
+    });
+    d.fields.insert("mode".into(), mode.clone());
+    d.fields.insert("percent".into(), percent.clone());
+    let (ok, cancel) = buttons(ui, "OK");
+    if ok {
+        if mode == "fit" {
+            app.ui.zoom = None;
+            return true;
+        }
+        match parse_zoom_percent(&percent) {
+            Some(scale) => app.ui.zoom = Some(scale),
+            None => {
+                app.set_status("Enter a zoom percent");
+                return false;
+            }
+        }
+    }
+    ok || cancel
+}
+
 /// Returns true when the dialog should close.
 fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     let run = |app: &mut SlideApp, id: &str, p: Value| {
@@ -321,18 +382,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             });
             done
         }
-        "zoom" => {
-            for pct in [400, 200, 150, 100, 75, 66, 50, 33] {
-                if ui.radio(false, format!("{pct}%")).clicked() {
-                    let _ = app.run("view.zoom", json!({"percent": pct}));
-                }
-            }
-            if ui.button("Fit").clicked() {
-                app.ui.zoom = None;
-            }
-            let (ok, cancel) = buttons(ui, "OK");
-            ok || cancel
-        }
+        "zoom" => zoom_dialog(app, ui, d),
         "comment" => {
             let mut v = d.get("text", "");
             ui.add(egui::TextEdit::multiline(&mut v).hint_text("Start a conversation").desired_rows(4).desired_width(320.0));
@@ -829,3 +879,25 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+mod tests {
+    use super::parse_zoom_percent;
+
+    fn near(v: f32, want: f32) -> bool {
+        (v - want).abs() < 1.0e-4
+    }
+
+    #[test]
+    fn zoom_percent_accepts_a_number_and_clamps() {
+        assert!(parse_zoom_percent("150").is_some_and(|v| near(v, 1.5)));
+        assert!(parse_zoom_percent("150%").is_some_and(|v| near(v, 1.5)));
+        assert!(parse_zoom_percent("  100 ").is_some_and(|v| near(v, 1.0)));
+        assert!(parse_zoom_percent("1").is_some_and(|v| near(v, 0.1)));
+        assert!(parse_zoom_percent("900").is_some_and(|v| near(v, 4.0)));
+        assert!(parse_zoom_percent("").is_none());
+        assert!(parse_zoom_percent("fit").is_none());
+        assert!(parse_zoom_percent("nan").is_none());
+        assert!(parse_zoom_percent("inf").is_none());
+    }
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..e62e6ae7 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -144,7 +144,8 @@ pub const UI_COMMANDS: &[(&str, &str, Option<&str>, &str)] = &[
     ("view.guides", "Guides", Some("Alt+F9"), "{on?: bool}"),
     ("view.zoomIn", "Zoom In", Some("Cmd+="), "{}"),
     ("view.zoomOut", "Zoom Out", Some("Cmd+-"), "{}"),
-    ("view.zoom", "Zoom…", None, "{percent}"),
+    ("view.zoom", "Set Zoom", None, "{percent}"),
+    ("view.zoomDialog", "Zoom…", None, "{}"),
     ("view.fit", "Fit to Window", None, "{}"),
     ("view.pane", "Task Pane", None, "{pane: format|animation|selection|comments|designer|background|null}"),
     ("view.tab", "Ribbon Tab", None, "{tab}"),
@@ -472,6 +473,7 @@ impl SlideApp {
                 let pct = p.get("percent").and_then(Value::as_f64).ok_or("missing `percent`")?;
                 self.ui.zoom = Some((pct as f32 / 100.0).clamp(0.1, 4.0));
             }
+            "view.zoomDialog" => self.dialog = Some(dialogs::Dialog::new("zoom")),
             "view.fit" => self.ui.zoom = None,
             "view.pane" => {
                 let pane = p.get("pane").and_then(Value::as_str).map(String::from);
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 25398b45..d32202e0 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -195,6 +195,7 @@ pub fn menu_tree() -> Vec<(&'static str, Vec<(&'static str, &'static str)>)> {
                 ("Gridlines", "view.gridlines"),
                 ("Guides", "view.guides"),
                 ("-", ""),
+                ("Zoom…", "view.zoomDialog"),
                 ("Zoom In", "view.zoomIn"),
                 ("Zoom Out", "view.zoomOut"),
                 ("Fit to Window", "view.fit"),
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..96e7a868 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1848,14 +1848,24 @@ fn view(app: &mut SlideApp, ui: &mut Ui) {
         }
     });
     group(ui, |ui| {
-        let r = big_button(ui, Icon::ZoomGlass, "Zoom", true);
-        egui::Popup::menu(&r).show(|ui| {
-            for pct in [400, 200, 150, 100, 75, 66, 50, 33] {
-                if ui.button(format!("{pct}%")).clicked() {
-                    let _ = app.run("view.zoom", json!({"percent": pct}));
+        let (main, arrow) = big_button_ex(ui, Icon::ZoomGlass, "Zoom", true, true, false);
+        if main.on_hover_text("Zoom").clicked() {
+            let _ = app.run("view.zoomDialog", json!({}));
+        }
+        if let Some(a) = arrow {
+            egui::Popup::menu(&a).show(|ui| {
+                for pct in [400, 200, 150, 100, 75, 66, 50, 33] {
+                    if ui.button(format!("{pct}%")).clicked() {
+                        let _ = app.run("view.zoom", json!({"percent": pct}));
+                        ui.close();
+                    }
                 }
-            }
-        });
+                if ui.button("Fit").clicked() {
+                    let _ = app.run("view.fit", json!({}));
+                    ui.close();
+                }
+            });
+        }
         if big_button(ui, Icon::FitToWindow, "Fit to\nWindow", true).clicked() {
             app.ui.zoom = None;
         }
diff --git a/crates/ui-egui/src/status.rs b/crates/ui-egui/src/status.rs
index 8e915b71..79b6a5d2 100644
--- a/crates/ui-egui/src/status.rs
+++ b/crates/ui-egui/src/status.rs
@@ -42,7 +42,7 @@ pub fn status_bar(app: &mut SlideApp, ui: &mut Ui) {
         let pct = (app.ui.zoom.unwrap_or(app.canvas_scale) * 100.0).round();
         let lbl = right.add(egui::Label::new(egui::RichText::new(format!("{pct}%")).size(12.0).color(t.text_dim)).sense(Sense::click()));
         if lbl.clicked() {
-            app.dialog = Some(crate::dialogs::Dialog::new("zoom"));
+            let _ = app.run("view.zoomDialog", json!({}));
         }
         if small_icon(&mut right, Icon::ZoomIn, "Zoom In", false).clicked() {
             let _ = app.run("view.zoomIn", json!({}));
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 97953034..db23c6e5 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,6 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (core-workflow alpha gate added; stage stays alpha; previous: major, created; milestones carried from the local execution plan, the beta plan built from gaps.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Zoom dialog; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -109,5 +109,6 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | View: Zoom dialog (percent or Fit) |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..55b6bd63 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Zoom dialog; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -230,8 +230,8 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide, pen,
   presenter window, rehearse timings, custom shows, Set Up Show, Reading View; links and shape
   actions followed on click.
-- **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom;
-  grayscale.
+- **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom
+  (dialog: percent or Fit); grayscale.
 - **Review:** comments with replies and resolve, accessibility checker, a basic spelling list.
 - **Media:** MP3, AAC/M4A, ALAC, WAV, AIFF, CAF, FLAC, Ogg Vorbis and Opus audio; H.264, HEVC,
   VP9 and AV1 video in MP4/MOV/WebM/MKV with pure-Rust decoders; poster frames, trim, fades,
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Zoom dialog takes a percent or Fit. Breadth stays 79%; the zoom checklist row stays D |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..2bb8f53a 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Zoom dialog: percent or Fit, applies on OK; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom (percent or Fit, applies on OK), Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Zoom dialog: percent or Fit, applied on OK. View ▸ Zoom opens it; the arrow keeps the presets |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From a9e7747ea5262dff2b10b675ac1c07f35b153058 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 04:55:33 +0300
Subject: [PATCH 277/376] Canvas: a two-finger twist rotates the selection

macOS delivers a trackpad rotation as egui's Rotate event. While the
pointer is over the canvas, that twist turns the selected shapes, and
the whole gesture is one undo step. Pinch-zoom and scrolling are unchanged.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                     |  1 +
 crates/engine/src/cmd/shape.rs | 67 +++++++++++++++++++++++++++++++++-
 crates/engine/src/tools.rs     | 10 ++++-
 crates/ui-egui/src/canvas.rs   | 27 ++++++++++++++
 crates/ui-egui/src/lib.rs      | 48 ++++++++++++++++++++++++
 docs/gaps.md                   |  5 ++-
 docs/hardware-parity.md        |  5 ++-
 7 files changed, 157 insertions(+), 6 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..e9a8fe0c 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | A two-finger twist on the trackpad rotates the selected shapes, as one undo step. Pinch-zoom is unchanged |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/crates/engine/src/cmd/shape.rs b/crates/engine/src/cmd/shape.rs
index b4c6aa4e..159321e7 100644
--- a/crates/engine/src/cmd/shape.rs
+++ b/crates/engine/src/cmd/shape.rs
@@ -33,7 +33,15 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("shape.move", "Move", [], None, "{dx?, dy?: pt (relative) | x?, y?: pt (absolute), ids?}", has_selection, move_by),
         cmd!("shape.resize", "Size", ["Shape Format", "Size"], None, "{w?, h?: pt, lockAspect?: bool, ids?}", has_selection, resize),
         cmd!("shape.setBounds", "Position and Size", [], None, "{x, y, w, h, ids?}", has_selection, set_bounds),
-        cmd!("shape.rotate", "Rotation", ["Shape Format", "Arrange", "Rotate"], None, "{deg?: absolute, by?: relative, ids?}", has_selection, rotate),
+        cmd!(
+            "shape.rotate",
+            "Rotation",
+            ["Shape Format", "Arrange", "Rotate"],
+            None,
+            "{deg?: absolute, by?: relative, ids?, gesture?: move|end}",
+            has_selection,
+            rotate
+        ),
         cmd!("shape.flip", "Flip", ["Shape Format", "Arrange", "Rotate"], None, "{axis: horizontal|vertical, ids?}", has_selection, flip),
         cmd!("shape.adjust", "Adjust Shape", [], None, "{index, value (file units), ids?}", has_selection, adjust),
         cmd!("shape.change", "Change Shape", ["Shape Format", "Insert Shapes", "Edit Shape"], None, "{preset, ids?}", has_selection, change),
@@ -174,6 +182,15 @@ fn set_bounds(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 fn rotate(s: &mut Session, p: &Value) -> Result<Value> {
+    // A trackpad twist sends many small steps. `gesture: move` keeps them as one undo;
+    // `gesture: end` commits that step and does not rotate again.
+    if p.get("gesture").and_then(Value::as_str) == Some("end") {
+        s.commit_named("Rotation");
+        return Ok(json!({}));
+    }
+    if p.get("gesture").and_then(Value::as_str) == Some("move") {
+        s.begin("Rotation");
+    }
     let (abs, by) = (f64_param(p, "deg"), f64_param(p, "by"));
     edit_geometry(s, p, "shape.rotate", |sh| {
         if let Some(x) = sh.xfrm.as_mut() {
@@ -860,3 +877,51 @@ fn freeform(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     Ok(json!({"id": id.0}))
 }
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used)]
+
+    use super::*;
+    use serde_json::json;
+
+    fn rotation(s: &Session) -> f64 {
+        let st = s.active().unwrap();
+        let id = st.selection.shapes[0];
+        st.shape(id).unwrap().xfrm.unwrap().rot
+    }
+
+    #[test]
+    fn a_twist_is_one_undo_and_wraps_past_a_full_turn() {
+        let mut s = Session::with_new();
+        s.execute("edit.select", &json!({"ids": []})).unwrap();
+        let id = s.execute("shape.insert", &json!({"preset": "rect", "rect": [40.0, 40.0, 80.0, 40.0]})).unwrap();
+        let id = id.get("id").and_then(Value::as_u64).unwrap();
+        s.execute("edit.select", &json!({"ids": [id]})).unwrap();
+        assert!((rotation(&s) - 0.0).abs() < 0.01);
+
+        s.execute("shape.rotate", &json!({"by": 10.0, "gesture": "move"})).unwrap();
+        s.execute("shape.rotate", &json!({"by": 350.0, "gesture": "move"})).unwrap();
+        assert!((rotation(&s) - 0.0).abs() < 0.01, "10 + 350 wraps to 0, got {}", rotation(&s));
+        s.execute("shape.rotate", &json!({"by": 20.0, "gesture": "move"})).unwrap();
+        s.execute("shape.rotate", &json!({"gesture": "end", "ids": []})).unwrap();
+        assert!((rotation(&s) - 20.0).abs() < 0.01);
+        assert_eq!(s.active().unwrap().history.undo.last().unwrap().label, "Rotation");
+        assert!(s.active().unwrap().interaction.is_none());
+
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert!((rotation(&s) - 0.0).abs() < 0.01, "one undo undoes the whole twist");
+        s.execute("edit.redo", &json!({})).unwrap();
+        assert!((rotation(&s) - 20.0).abs() < 0.01);
+    }
+
+    #[test]
+    fn ending_a_twist_does_not_commit_a_drag() {
+        let mut s = Session::with_new();
+        s.execute("shape.insert", &json!({"preset": "ellipse", "rect": [10.0, 10.0, 30.0, 30.0]})).unwrap();
+        let st = s.active_mut().unwrap();
+        st.interaction = Some(crate::Interaction { label: "Move".into(), doc: st.doc.clone(), selection: st.selection.clone() });
+        s.execute("shape.rotate", &json!({"gesture": "end", "ids": []})).unwrap();
+        assert_eq!(s.active().unwrap().interaction.as_ref().unwrap().label, "Move");
+    }
+}
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index bf8b5c31..3b75c76e 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -309,7 +309,7 @@ impl Session {
         }
     }
 
-    fn begin(&mut self, label: &str) {
+    pub(crate) fn begin(&mut self, label: &str) {
         if let Some(st) = self.active_mut()
             && st.interaction.is_none()
         {
@@ -326,6 +326,14 @@ impl Session {
         }
     }
 
+    /// End the interaction only when it is the one `label` started. A twist must not commit a drag.
+    pub(crate) fn commit_named(&mut self, label: &str) {
+        let ours = self.active().and_then(|st| st.interaction.as_ref()).is_some_and(|i| i.label == label);
+        if ours {
+            self.commit();
+        }
+    }
+
     fn down(&mut self, p: Point, mods: Mods, tol: f64) -> Result<Value> {
         if let Some(Drag::Freeform { mode, mut points, .. }) = self.tool.drag.clone() {
             // Next click of a freeform: close on the start point, else add a vertex.
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 253765bf..e798f6e0 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -35,6 +35,33 @@ fn mods(ui: &Ui) -> Mods {
     ui.input(|i| Mods { shift: i.modifiers.shift, alt: i.modifiers.alt, cmd: i.modifiers.command || i.modifiers.ctrl })
 }
 
+/// A two-finger twist on the trackpad. macOS delivers it as [`egui::Event::Rotate`];
+/// other platforms leave the delta at zero.
+///
+/// The selected shapes turn with the fingers. The whole twist is one undo step. Pinch-zoom
+/// and two-finger scrolling are left as they are.
+pub(crate) fn trackpad_twist(app: &mut SlideApp, ctx: &egui::Context) {
+    let delta = ctx.input(|i| i.rotation_delta());
+    let delta = if delta.is_finite() { delta.clamp(-std::f32::consts::PI, std::f32::consts::PI) } else { 0.0 };
+    let turning = delta.abs() > 1e-4;
+    let blocked = app.show.is_some()
+        || app.backstage_open()
+        || app.dialog.as_ref().is_some_and(|d| d.modal())
+        || app.palette.is_some()
+        || app.session.tool.dragging();
+    let over = app.canvas_rect.is_some_and(|r| ctx.input(|i| i.pointer.hover_pos()).is_some_and(|p| r.contains(p)));
+    let rotatable = app.session.active().is_some_and(|d| {
+        d.selection.text.is_none() && d.selection.shapes.iter().any(|id| d.shape(*id).is_some_and(|sh| !sh.locked && sh.xfrm.is_some()))
+    });
+    if !blocked && turning && rotatable && (app.twisting || over) {
+        let _ = app.run("shape.rotate", json!({"by": f64::from(delta.to_degrees()), "gesture": "move"}));
+        app.twisting = true;
+    } else if app.twisting {
+        let _ = app.run("shape.rotate", json!({"gesture": "end", "ids": []}));
+        app.twisting = false;
+    }
+}
+
 /// The slide's rect on screen for the current zoom.
 pub fn layout(app: &SlideApp, avail: Rect) -> (Rect, f32) {
     let Some(d) = app.session.active() else { return (avail, 1.0) };
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..d1f190e8 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -227,6 +227,8 @@ pub struct SlideApp {
     pub(crate) thumb_drag: Option<(usize, usize)>,
     /// Selection pane: folded groups, renaming, drag and drop.
     pub selpane: selpane::State,
+    /// A trackpad twist is in progress (one undo step when it ends).
+    twisting: bool,
 }
 
 impl SlideApp {
@@ -267,6 +269,7 @@ impl SlideApp {
             ui_fonts: uifonts::UiFonts::default(),
             thumb_drag: None,
             selpane: selpane::State::default(),
+            twisting: false,
         }
     }
 
@@ -779,6 +782,7 @@ impl SlideApp {
                 Err(e) => self.set_status(e),
             }
         }
+        canvas::trackpad_twist(self, ctx);
     }
 
     /// Borrow faces for interface text in scripts the interface fonts lack (#101): the open
@@ -1136,6 +1140,50 @@ mod tests {
 
     use super::*;
 
+    fn shape_rot(app: &SlideApp) -> f64 {
+        let d = app.session.active().unwrap();
+        let id = d.selection.shapes[0];
+        d.shape(id).unwrap().xfrm.unwrap().rot
+    }
+
+    /// A two-finger twist is egui's Rotate event. Over the canvas it turns the selection;
+    /// letting go is one undo step. Off the canvas it does nothing.
+    #[test]
+    fn a_trackpad_twist_rotates_the_shape_under_the_canvas() {
+        let mut harness = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), Services::default()),
+        );
+        harness.run_steps(2);
+        let id = harness.state_mut().session.execute("shape.insert", &json!({"preset": "rect", "rect": [80.0, 80.0, 100.0, 60.0]})).unwrap();
+        let id = id.get("id").and_then(|v| v.as_u64()).unwrap();
+        harness.state_mut().session.execute("edit.select", &json!({"ids": [id]})).unwrap();
+        harness.run_steps(1);
+        let canvas = harness.state().canvas_rect.expect("canvas");
+        let outside = egui::pos2(1.0, 1.0);
+        assert!(!canvas.contains(outside), "the ribbon corner is not the canvas: {canvas:?}");
+
+        harness.input_mut().events.push(egui::Event::PointerMoved(outside));
+        harness.input_mut().events.push(egui::Event::Rotate(20.0_f32.to_radians()));
+        harness.run_steps(1);
+        assert!((shape_rot(harness.state()) - 0.0).abs() < 0.01, "off the canvas, still {}", shape_rot(harness.state()));
+
+        harness.input_mut().events.push(egui::Event::PointerMoved(canvas.center()));
+        harness.input_mut().events.push(egui::Event::Rotate(20.0_f32.to_radians()));
+        harness.run_steps(1);
+        harness.input_mut().events.push(egui::Event::PointerMoved(canvas.center()));
+        harness.input_mut().events.push(egui::Event::Rotate(10.0_f32.to_radians()));
+        harness.run_steps(1);
+        assert!((shape_rot(harness.state()) - 30.0).abs() < 0.05, "twist landed on {}", shape_rot(harness.state()));
+        harness.run_steps(1);
+        assert!(harness.state().session.active().unwrap().interaction.is_none());
+        harness.state_mut().session.execute("edit.undo", &json!({})).unwrap();
+        assert!((shape_rot(harness.state()) - 0.0).abs() < 0.01, "one undo, got {}", shape_rot(harness.state()));
+    }
+
     fn title_text(app: &SlideApp) -> String {
         let d = app.session.active().unwrap();
         let sh = &d.doc.slides[0].shapes[0];
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..68030390 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a two-finger twist rotates the selection; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -217,7 +217,7 @@ Detail in [hardware-parity.md](hardware-parity.md).
   or wgpu path).
 - **Software-only video decode**; PowerPoint uses VideoToolbox/Media Foundation. 8–14 h (copy
   FilmCraft's hardware decode).
-- **No pen pressure or tilt for ink**; no pinch-zoom or trackpad gestures. 3–6 h.
+- **No pen pressure or tilt for ink**; no pinch-zoom (it does not keep the point under the pointer). A two-finger twist does rotate the selected shapes. 3–6 h.
 
 ## Localization
 
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | A two-finger twist rotates the selected shapes. Pinch-zoom is still open |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/hardware-parity.md b/docs/hardware-parity.md
index 5ba34cfc..aada56db 100644
--- a/docs/hardware-parity.md
+++ b/docs/hardware-parity.md
@@ -1,6 +1,6 @@
 # Hardware parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a two-finger twist rotates the selection; previous: minor, IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 
 What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
 ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -43,7 +43,7 @@ because it mostly follows from hardware use.
 |---|---|---|
 | Keyboard and presentation clickers (Page Up/Down, B, Esc) | yes | yes |
 | Mouse and trackpad scroll | yes | yes |
-| Pinch to zoom, two-finger gestures | yes | no |
+| Pinch to zoom, two-finger gestures | yes | pinch zoom does not keep the point under the pointer; a two-finger twist rotates the selected shapes |
 | Pen pressure and tilt for ink (Apple Pencil via Sidecar, Windows Ink) | yes | no: ink strokes have constant width |
 | Touch screens (Windows) | yes | basic pointer only |
 | IME input methods for CJK text | yes | yes: composed in place, underlined, candidate window at the caret (#101) |
@@ -71,5 +71,6 @@ outlines every frame (#67, fix open), and the decoders run in software.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | A two-finger twist on the trackpad rotates the selected shapes, as one undo step. Pinch-zoom is unchanged |
 | 2026-10-12 | minor | IME input methods (#101) |
 | 2026-10-10 | major | Created: rendering, media, displays, input and performance against PowerPoint 16.113 |

From c2e770ab53609003bc7e19f7794d1817cd4bedd3 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:07:12 +0300
Subject: [PATCH 278/376] Show: Show Media Controls hides the playback bar

The Slide Show checkbox wrote nothing. show.setup now stores
showMediaControls, and the show draws the playback bar and GIF button
only while that setting is on.
---
 ROADMAP.md                      |  4 +-
 crates/engine/src/cmd/review.rs | 24 ++++++++-
 crates/ui-egui/src/ribbon.rs    |  4 +-
 crates/ui-egui/src/show.rs      | 90 +++++++++++++++++++++++++++++----
 docs/slideshow-parity.md        |  7 +--
 5 files changed, 113 insertions(+), 16 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..fb041c76 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Show Media Controls; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Slide Show: Show Media Controls writes the show setting and hides the playback bar and GIF button during the show |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Show Media Controls |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 8e3a532c..d132fc3b 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -27,7 +27,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Set Up Slide Show…",
             ["Slide Show", "Set Up"],
             None,
-            "{type?: speaker|browsed|kiosk, loop?: bool, noNarration?, noAnimation?, useTimings?, from?, to?}",
+            "{type?: speaker|browsed|kiosk, loop?: bool, noNarration?, noAnimation?, useTimings?, showMediaControls?, from?, to?}",
             has_doc,
             setup
         ),
@@ -240,6 +240,9 @@ fn setup(s: &mut Session, p: &Value) -> Result<Value> {
         if let Some(v) = bool_param(p, "useTimings") {
             sh.use_timings = v;
         }
+        if let Some(v) = bool_param(p, "showMediaControls") {
+            sh.show_media_controls = v;
+        }
         match (p.get("from").and_then(Value::as_u64), p.get("to").and_then(Value::as_u64)) {
             (Some(a), Some(b)) => sh.range = Some((a.min(u32::MAX as u64) as u32, b.min(u32::MAX as u64) as u32)),
             (None, None) if p.get("all").is_some() => sh.range = None,
@@ -264,3 +267,22 @@ fn custom_show(s: &mut Session, p: &Value) -> Result<Value> {
     })?;
     ok()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn show_media_controls_follow_setup() {
+        let mut s = Session::with_new();
+        assert!(s.doc().expect("doc").doc.show.show_media_controls);
+        let off = s.execute("show.setup", &json!({"showMediaControls": false})).expect("off");
+        assert_eq!(off["showMediaControls"], false);
+        assert_eq!(off["useTimings"], true, "other setup flags stay");
+        let timings = s.execute("show.setup", &json!({"useTimings": false})).expect("timings");
+        assert_eq!(timings["showMediaControls"], false);
+        assert_eq!(timings["useTimings"], false);
+        s.execute("show.setup", &json!({"showMediaControls": true})).expect("on");
+        assert!(s.doc().expect("doc").doc.show.show_media_controls);
+    }
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..bb28e911 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1747,7 +1747,9 @@ fn slide_show(app: &mut SlideApp, ui: &mut Ui) {
                 run(app, "show.setup", json!({"noNarration": !narr}));
             }
             let mut mc = app.session.active().is_none_or(|d| d.doc.show.show_media_controls);
-            let _ = ui.checkbox(&mut mc, "Show Media Controls");
+            if ui.checkbox(&mut mc, "Show Media Controls").changed() {
+                run(app, "show.setup", json!({"showMediaControls": mc}));
+            }
         });
     });
 }
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..53cd4475 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -314,8 +314,8 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             _ => {}
         }
     }
-    let on_slide = !show.pen && !show.ended && show.blank.is_none() && !show.reading_bar_hit(&ctx);
-    let gif_click = if clicked && on_slide { gif_hit(&ctx, ui, &show, &doc, app) } else { None };
+    let on_slide = !show.pen && !show.ended && show.blank.is_none() && !show.reading_bar_hit(&ctx) && !pointer_on_media_bar(&ctx, ui, &doc, &show);
+    let gif_click = if clicked && on_slide && doc.show.show_media_controls { gif_hit(&ctx, ui, &show, &doc, app) } else { None };
     let media_click = if clicked && on_slide && gif_click.is_none() { media_hit(&ctx, ui, &show, &doc) } else { None };
     let link = if on_slide && gif_click.is_none() && media_click.is_none() { link_hit(&ctx, ui, &mut show, &doc) } else { None };
     if let Some(id) = gif_click {
@@ -330,7 +330,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             LinkJump::Exit => keep = false,
             LinkJump::None => {}
         }
-    } else if clicked && !show.pen && !show.reading_bar_hit(&ctx) {
+    } else if clicked && !show.pen && !show.reading_bar_hit(&ctx) && !pointer_on_media_bar(&ctx, ui, &doc, &show) {
         if show.ended {
             keep = false;
         } else if show.blank.is_some() {
@@ -549,13 +549,29 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
                 };
                 crate::media::paint_frame(&painter, &app.media, *id, r);
             }
-            // Play/pause on the animated GIF under the pointer.
-            if let Some(p) = ctx.input(|i| i.pointer.hover_pos()).filter(|_| !show.pen && now - show.last_move < 2.5) {
-                for g in &gifs {
-                    let r = on_screen(srect, k, &g.rect);
-                    if r.contains(p) {
-                        let b = crate::media::gif_button_rect(r);
-                        crate::media::paint_gif_button(&painter, b, g.paused, b.contains(p));
+            // Play/pause on the animated GIF under the pointer, and the audio/video bar.
+            // Slide Show ▸ Show Media Controls hides both (the click still plays a clip).
+            if doc.show.show_media_controls {
+                if let Some(p) = ctx.input(|i| i.pointer.hover_pos()).filter(|_| !show.pen && now - show.last_move < 2.5) {
+                    for g in &gifs {
+                        let r = on_screen(srect, k, &g.rect);
+                        if r.contains(p) {
+                            let b = crate::media::gif_button_rect(r);
+                            crate::media::paint_gif_button(&painter, b, g.paused, b.contains(p));
+                        }
+                    }
+                }
+                if let Some((id, clip, bar)) = media_bar_target(&ctx, &doc, &show, srect) {
+                    let action = {
+                        let status = app.media.status(id);
+                        crate::media::control_bar(ui, bar, status.as_ref(), &clip)
+                    };
+                    let pos = app.media.status(id).map(|s| s.position).unwrap_or(0.0);
+                    match action {
+                        Some(crate::media::BarAction::Toggle) => app.media.toggle(&doc, id, &clip, crate::media::Owner::Show),
+                        Some(crate::media::BarAction::Seek(t)) => app.media.seek(&doc, id, &clip, t, crate::media::Owner::Show),
+                        Some(crate::media::BarAction::Nudge(dt)) => app.media.seek(&doc, id, &clip, (pos + dt).max(0.0), crate::media::Owner::Show),
+                        None => {}
                     }
                 }
             }
@@ -712,6 +728,60 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
     }
 }
 
+/// Slide rectangle the show draws into (the reading bar keeps its strip).
+fn shown_slide_rect(ui: &Ui, show: &Show, doc: &Presentation) -> Rect {
+    let full = ui.max_rect();
+    let avail = if show.reading { Rect::from_min_max(full.min, pos2(full.max.x, full.max.y - 34.0)) } else { full };
+    fit(avail, doc)
+}
+
+/// Playback bar for one clip: along the bottom inside a large shape, just under a small icon.
+fn media_bar_rect(shape: Rect) -> Rect {
+    let h = 26.0f32;
+    let w = shape.width().clamp(160.0, 420.0);
+    if shape.height() >= h + 16.0 && shape.width() >= 160.0 {
+        Rect::from_min_size(pos2(shape.min.x + 4.0, shape.max.y - h - 4.0), vec2((shape.width() - 8.0).min(w), h))
+    } else {
+        Rect::from_min_size(pos2(shape.center().x - w / 2.0, shape.max.y + 4.0), vec2(w, h))
+    }
+}
+
+fn slide_media_bars(srect: Rect, doc: &Presentation, slide: usize) -> Vec<(ShapeId, deckcraft_model::MediaClip, Rect, Rect)> {
+    let k = srect.width() / doc.slide_size.width.max(1.0) as f32;
+    crate::media::slide_media(doc, slide)
+        .into_iter()
+        .map(|(id, x, clip)| {
+            let r = Rect::from_min_size(pos2(srect.min.x + x.x as f32 * k, srect.min.y + x.y as f32 * k), vec2(x.w as f32 * k, x.h as f32 * k));
+            let bar = media_bar_rect(r);
+            (id, clip, r, bar)
+        })
+        .collect()
+}
+
+/// The clip whose bar or shape is under the pointer, when Show Media Controls is on.
+fn media_bar_target(ctx: &egui::Context, doc: &Presentation, show: &Show, srect: Rect) -> Option<(ShapeId, deckcraft_model::MediaClip, Rect)> {
+    if !doc.show.show_media_controls || show.pen || show.ended || show.blank.is_some() {
+        return None;
+    }
+    let p = ctx.input(|i| i.pointer.hover_pos())?;
+    let items = slide_media_bars(srect, doc, show.state.slide);
+    if let Some((id, clip, _, bar)) = items.iter().rev().find(|(_, _, _, bar)| bar.contains(p)) {
+        return Some((*id, clip.clone(), *bar));
+    }
+    let (id, clip, _, bar) = items.iter().rev().find(|(_, _, r, _)| r.contains(p))?;
+    Some((*id, clip.clone(), *bar))
+}
+
+/// True when the pointer is on a visible playback bar, so that click must not advance the show.
+fn pointer_on_media_bar(ctx: &egui::Context, ui: &Ui, doc: &Presentation, show: &Show) -> bool {
+    if !doc.show.show_media_controls || show.pen || show.ended || show.blank.is_some() {
+        return false;
+    }
+    let Some(p) = ctx.input(|i| i.pointer.interact_pos().or(i.pointer.hover_pos())) else { return false };
+    let srect = shown_slide_rect(ui, show, doc);
+    slide_media_bars(srect, doc, show.state.slide).iter().any(|(_, _, _, bar)| bar.contains(p))
+}
+
 /// The media shape under the pointer on the shown slide.
 fn media_hit(ctx: &egui::Context, ui: &Ui, show: &Show, doc: &Presentation) -> Option<(ShapeId, deckcraft_model::MediaClip)> {
     let p = ctx.input(|i| i.pointer.interact_pos())?;
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index fd981595..4ddd1846 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Show Media Controls hides the show's playback bar and GIF button; breadth stays 66%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -20,8 +20,8 @@ ready** (estimated), **10–16 h** to parity.
 | Step clock: a click after a long pause plays its step (#11) | yes | yes | |
 | Hidden slides skipped | yes | yes | |
 | Hyperlinks and action settings followed (slides, web, mail, End Show, Last Viewed) | yes | yes | Only `http(s)` and `mailto` open outside the show, by design (`safe_url`) |
-| Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable |
-| Animated GIFs play; pause from their corner button | yes | yes (#39) | |
+| Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable. Slide Show ▸ Show Media Controls (on by default) hides the playback bar |
+| Animated GIFs play; pause from their corner button | yes | yes (#39) | The corner button hides with Show Media Controls |
 | See All Slides grid during the show | yes | no | |
 | Zoom into part of a slide during the show | yes | no | |
 | Pen and highlighter ink | yes | pen only (Cmd+P pen, Cmd+A arrow, E erases all ink) | No highlighter, per-stroke eraser, ink colours, or keep/discard annotations prompt |
@@ -73,4 +73,5 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Show Media Controls hides the show's playback bar and GIF button |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |

From ef858b710fe034958f49e99a6737d80ac8a4ff8e Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:07:18 +0300
Subject: [PATCH 279/376] Merge Shapes: a text box merges as its letters; a
 picture keeps its place (#653)

---
 crates/engine/src/cmd/merge.rs | 169 ++++++++++++++++++++++++++++-----
 crates/render/src/lib.rs       |   4 +-
 crates/render/src/placed.rs    |  29 ++++++
 3 files changed, 174 insertions(+), 28 deletions(-)

diff --git a/crates/engine/src/cmd/merge.rs b/crates/engine/src/cmd/merge.rs
index 4c9a6d28..24b4c3ea 100644
--- a/crates/engine/src/cmd/merge.rs
+++ b/crates/engine/src/cmd/merge.rs
@@ -30,39 +30,87 @@ pub fn specs() -> Vec<CommandSpec> {
     )]
 }
 
-/// The filled outline of `s` in slide points (curves flattened).
+/// The filled outline of `s` in slide points (curves flattened). A text box with no fill and no
+/// outline is its letters, as in PowerPoint (merging text with a picture fills the letters).
 fn area_of(doc: &deckcraft_model::Presentation, sel: &crate::Selection, s: &Shape) -> Area {
+    if let Some((letters, _)) = letters_of(doc, sel, s) {
+        return letters;
+    }
     let x = xfrm_of(doc, sel, s);
     let geo = deckcraft_render::shape_geometry(s, x.w, x.h);
     let a = x.affine();
     let mut out: Area = vec![];
     for sp in geo.paths.iter().filter(|p| p.fill != deckcraft_geom::preset::FillMode::None) {
-        let mut cur: Vec<[f64; 2]> = vec![];
-        let flush = |cur: &mut Vec<[f64; 2]>, out: &mut Area| {
-            if cur.len() > 2 {
-                out.push(std::mem::take(cur));
-            } else {
-                cur.clear();
-            }
-        };
-        deckcraft_geom::preset_flatten(&sp.path, &mut |el| match el {
-            PathEl::MoveTo(p) => {
-                flush(&mut cur, &mut out);
-                let q = a * p;
-                cur.push([q.x, q.y]);
-            }
-            PathEl::LineTo(p) => {
-                let q = a * p;
-                cur.push([q.x, q.y]);
-            }
-            PathEl::ClosePath => flush(&mut cur, &mut out),
-            _ => {}
-        });
-        flush(&mut cur, &mut out);
+        flatten(&sp.path, a, &mut out);
     }
     out
 }
 
+/// The letters of a text box with no fill and no outline, in slide points, and their colour.
+fn letters_of(doc: &deckcraft_model::Presentation, sel: &crate::Selection, s: &Shape) -> Option<(Area, Option<deckcraft_color::Rgba>)> {
+    use deckcraft_model::resolve;
+    use deckcraft_model::style::Fill;
+    if !matches!(s.kind, ShapeKind::Shape) || s.text.as_ref().is_none_or(|t| t.is_empty()) {
+        return None;
+    }
+    let ctx = super::text::ctx_for(doc, sel)?;
+    let none = |f: Option<&Fill>| f.is_none_or(Fill::is_none);
+    if !none(resolve::fill(&ctx, s).0.as_ref()) || !none(resolve::line(&ctx, s).0.fill.as_ref()) {
+        return None;
+    }
+    let (path, colour) = deckcraft_render::text_outline(&ctx, s, xfrm_of(doc, sel, s).affine());
+    let mut out: Area = vec![];
+    flatten(&path, deckcraft_geom::Affine::IDENTITY, &mut out);
+    (!out.is_empty()).then_some((out, colour))
+}
+
+/// Append the closed polygons of `path` (mapped by `a`) to `out`.
+fn flatten(path: &deckcraft_geom::BezPath, a: deckcraft_geom::Affine, out: &mut Area) {
+    let mut cur: Vec<[f64; 2]> = vec![];
+    let flush = |cur: &mut Vec<[f64; 2]>, out: &mut Area| {
+        if cur.len() > 2 {
+            out.push(std::mem::take(cur));
+        } else {
+            cur.clear();
+        }
+    };
+    deckcraft_geom::preset_flatten(path, &mut |el| match el {
+        PathEl::MoveTo(p) => {
+            flush(&mut cur, out);
+            let q = a * p;
+            cur.push([q.x, q.y]);
+        }
+        PathEl::LineTo(p) => {
+            let q = a * p;
+            cur.push([q.x, q.y]);
+        }
+        PathEl::ClosePath => flush(&mut cur, out),
+        _ => {}
+    });
+    flush(&mut cur, out);
+}
+
+/// Keep a picture where it was on the slide when its box becomes `to`: crop it to the new box.
+/// Only for upright, unflipped pictures stretched over their box.
+fn recrop(fill: &mut deckcraft_model::style::PictureFill, from: &Xfrm, to: &Xfrm) {
+    use deckcraft_model::style::PictureMode;
+    if from.rot != 0.0 || from.flip_h || from.flip_v || !matches!(fill.mode, PictureMode::Stretch { fill_rect } if fill_rect == [0.0; 4]) {
+        return;
+    }
+    let [l, t, r, b] = fill.crop;
+    let (fw, fh) = (1.0 - l - r, 1.0 - t - b);
+    if !(fw > 1e-9 && fh > 1e-9 && from.w > 0.0 && from.h > 0.0) {
+        return;
+    }
+    // The whole image in slide points.
+    let (iw, ih) = (from.w / fw, from.h / fh);
+    let (ix, iy) = (from.x - l * iw, from.y - t * ih);
+    let c = [(to.x - ix) / iw, (to.y - iy) / ih, (ix + iw - to.x - to.w) / iw, (iy + ih - to.y - to.h) / ih];
+    if c.iter().all(|v| v.is_finite()) {
+        fill.crop = c;
+    }
+}
+
 fn overlay(a: &Area, b: &Area, rule: OverlayRule) -> Area {
     if a.is_empty() && matches!(rule, OverlayRule::Union | OverlayRule::Xor) {
         return b.clone();
@@ -155,7 +203,17 @@ fn merge(s: &mut Session, p: &Value) -> Result<Value> {
     }
     let areas: Vec<Area> = shapes.iter().map(|x| area_of(&st.doc, &st.selection, x)).collect();
     let results = merge_areas(&op, &areas);
-    let template = shapes[0].clone();
+    let mut template = shapes[0].clone();
+    let template_box = xfrm_of(&st.doc, &st.selection, &template);
+    // Letters merged become shapes filled with the text's colour.
+    let letters = letters_of(&st.doc, &st.selection, &template);
+    if let Some((_, colour)) = &letters {
+        use deckcraft_model::style::{ColorRef, Fill, Line};
+        template.fill = Some(Fill::solid(ColorRef::rgb(colour.unwrap_or(deckcraft_color::Rgba::BLACK))));
+        template.line = Some(Line { fill: Some(Fill::None), ..Default::default() });
+        template.text_box = false;
+    }
+    let drop_text = letters.is_some() || shapes.iter().skip(1).any(|x| letters_of(&st.doc, &st.selection, x).is_some());
     let mut new_ids = vec![];
     s.edit(|doc, sel| {
         let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("shape.merge", "no slide"))?;
@@ -169,8 +227,11 @@ fn merge(s: &mut Session, p: &Value) -> Result<Value> {
             sh.xfrm = Some(x);
             sh.geom = geom;
             sh.name = format!("Freeform {}", k + 1);
-            // Text stays with the first piece only.
-            if k > 0 {
+            if let ShapeKind::Picture { fill } = &mut sh.kind {
+                recrop(fill, &template_box, &x);
+            }
+            // Text stays with the first piece only, and not at all once it became outlines.
+            if k > 0 || drop_text {
                 sh.text = None;
             }
             made.push(sh);
@@ -216,4 +277,60 @@ mod tests {
         // Disjoint intersect is empty.
         assert!(merge_areas("intersect", &[square(0.0, 0.0, 1.0), square(5.0, 5.0, 1.0)]).is_empty());
     }
+
+    fn picture_and_text(s: &mut Session) -> (ShapeId, ShapeId) {
+        let mut png = Vec::new();
+        image::RgbaImage::from_pixel(40, 20, image::Rgba([0, 128, 255, 255]))
+            .write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png)
+            .expect("png");
+        let _ = s.execute("slide.new", &json!({"layout": "blank"}));
+        let r = s
+            .execute("insert.picture", &json!({"name": "a.png", "data": base64_encode(&png), "rect": [100.0, 100.0, 400.0, 200.0]}))
+            .expect("picture");
+        let pic = ShapeId(r["id"].as_u64().expect("id") as u32);
+        let r = s.execute("insert.textBox", &json!({"rect": [150.0, 120.0, 300.0, 100.0], "text": "HI"})).expect("text box");
+        let text = ShapeId(r["id"].as_u64().expect("id") as u32);
+        (pic, text)
+    }
+
+    #[test]
+    fn a_picture_intersected_with_text_fills_the_letters() {
+        // #653: the letters didn't change and the picture vanished (the text box counted as its
+        // whole box, and the merge took the text's outline but kept the box's formatting).
+        let mut s = Session::with_new();
+        let (pic, text) = picture_and_text(&mut s);
+        let st = s.doc().expect("doc");
+        let letters = letters_of(&st.doc, &st.selection, st.shape(text).expect("text")).expect("the text box is its letters").0;
+        let box_area = 300.0 * 100.0;
+        assert!(area_size(&letters) > 10.0 && area_size(&letters) < box_area * 0.5, "{}", area_size(&letters));
+        let r = s.execute("shape.merge", &json!({"op": "intersect", "ids": [pic.0, text.0]})).expect("merge");
+        let ids = r["ids"].as_array().expect("ids");
+        assert_eq!(ids.len(), 1);
+        let st = s.doc().expect("doc");
+        let out = st.shape(ShapeId(ids[0].as_u64().expect("id") as u32)).expect("result").clone();
+        let ShapeKind::Picture { fill } = &out.kind else { panic!("the picture fills the letters: {:?}", out.kind) };
+        assert!(out.text.is_none(), "the letters are outlines now");
+        // The result is the letters' outline, well inside the text box.
+        let x = out.xfrm.expect("box");
+        assert!(x.x >= 150.0 && x.y >= 120.0 && x.x + x.w <= 450.0 && x.y + x.h <= 220.0, "{x:?}");
+        let merged = area_of(&st.doc, &st.selection, &out);
+        assert!((area_size(&merged) - area_size(&letters)).abs() < area_size(&letters) * 0.05, "{} vs {}", area_size(&merged), area_size(&letters));
+        // The picture stays where it was on the slide: cropped to the new box.
+        let [l, t, rr, b] = fill.crop;
+        let iw = x.w / (1.0 - l - rr);
+        let ih = x.h / (1.0 - t - b);
+        assert!((x.x - l * iw - 100.0).abs() < 1e-6 && (iw - 400.0).abs() < 1e-6, "{:?}", fill.crop);
+        assert!((x.y - t * ih - 100.0).abs() < 1e-6 && (ih - 200.0).abs() < 1e-6, "{:?}", fill.crop);
+    }
+
+    #[test]
+    fn text_merged_first_becomes_shapes_in_its_colour() {
+        let mut s = Session::with_new();
+        let (pic, text) = picture_and_text(&mut s);
+        let r = s.execute("shape.merge", &json!({"op": "union", "ids": [text.0, pic.0]})).expect("merge");
+        let st = s.doc().expect("doc");
+        let out = st.shape(ShapeId(r["ids"][0].as_u64().expect("id") as u32)).expect("result");
+        assert!(matches!(out.kind, ShapeKind::Shape) && out.text.is_none());
+        assert!(matches!(out.fill, Some(deckcraft_model::style::Fill::Solid { .. })), "{:?}", out.fill);
+    }
 }
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..33b1e62f 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -49,7 +49,7 @@ pub use extent::{Region, TILE, layout_extent, pasteboard_region, slide_extent};
 pub use images::{decode as decode_image, gif_frame};
 pub use morph_path::PathMorph;
 pub use morph_text::TextMorph;
-pub use placed::{Placed, PlacedLink, PlacedText, place_slide};
+pub use placed::{Placed, PlacedLink, PlacedText, place_slide, text_outline};
 pub use table::row_heights as table_row_heights;
 pub use transition::{SlideParts, composite_transition, render_transition};
 
@@ -1850,7 +1850,7 @@ thread_local! {
     static GLYPH_CACHE: std::cell::RefCell<HashMap<(u32, u32), Arc<BezPath>>> = std::cell::RefCell::new(HashMap::new());
 }
 
-fn glyph(face: &deckcraft_fonts::FontFace, gid: u32) -> Arc<BezPath> {
+pub(crate) fn glyph(face: &deckcraft_fonts::FontFace, gid: u32) -> Arc<BezPath> {
     let key = (face.id(), gid);
     if let Some(p) = GLYPH_CACHE.with(|c| c.borrow().get(&key).cloned()) {
         return p;
diff --git a/crates/render/src/placed.rs b/crates/render/src/placed.rs
index 0a0d4737..02cf876a 100644
--- a/crates/render/src/placed.rs
+++ b/crates/render/src/placed.rs
@@ -123,3 +123,32 @@ fn run_link(body: &TextBody, para: usize, at: usize) -> Option<Hyperlink> {
     }
     None
 }
+
+/// The outlines of shape `s`'s text as drawn, in the space `m` maps shape-local points to, and
+/// the colour of its first visible run: what Merge Shapes turns letters into. Empty when the
+/// shape has no text.
+pub fn text_outline(rctx: &Ctx, s: &Shape, m: Affine) -> (kurbo::BezPath, Option<deckcraft_color::Rgba>) {
+    let mut out = kurbo::BezPath::new();
+    let Some(body) = s.text.as_ref().filter(|b| !b.is_empty()) else { return (out, None) };
+    let x = resolve::xfrm(rctx, s);
+    let tr = shape_geometry(s, x.w, x.h).text_rect;
+    let layout = deckcraft_text::layout(rctx, s, body, &Opts { rect: tr, fields: &deckcraft_text::NoFields, prompt_color: None, no_shrink: false });
+    let m = crate::text_transform(m, tr, layout.rotation);
+    let mut first = None;
+    for run in &layout.runs {
+        let k = run.size / run.face.upem.max(1.0);
+        let skew = if run.fake_italic { Affine::new([1.0, 0.0, -0.2, 1.0, 0.0, 0.0]) } else { Affine::IDENTITY };
+        for (gid, gx, gy) in &run.glyphs {
+            let path = crate::glyph(&run.face, *gid);
+            if path.elements().is_empty() {
+                continue;
+            }
+            if first.is_none() && run.color.a > 0 {
+                first = Some(run.color);
+            }
+            let at = m * crate::glyph_place(run, *gid, *gx, *gy) * skew * Affine::scale(k);
+            out.extend(path.elements().iter().map(|e| at * *e));
+        }
+    }
+    (out, first)
+}

From 29c24aa07cf9bc3a481b6c44e8468608e0e5adc4 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:19:44 +0300
Subject: [PATCH 280/376] UI: Alt Text's decorative checkbox follows the
 selection

The dialog always opened with Mark as decorative unchecked, so OK
cleared a shape that was already decorative. It now starts checked
when every selected shape is.
---
 ROADMAP.md                    |  4 +++-
 crates/ui-egui/src/dialogs.rs | 39 +++++++++++++++++++++++++++++++++--
 docs/ui-parity.md             |  5 +++--
 3 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..36eeafb3 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Alt Text decorative checkbox; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Alt Text: Mark as decorative opens checked when the selection already is, so OK no longer clears it |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Alt Text decorative checkbox |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..c7a5aa65 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -106,6 +106,18 @@ fn field(ui: &mut Ui, d: &mut Dialog, label: &str, key: &str, default: &str) {
     d.fields.insert(key.into(), v);
 }
 
+/// "Mark as decorative" starts checked when every selected shape is already decorative.
+fn alt_text_starts_decorative(decorative: impl IntoIterator<Item = bool>) -> bool {
+    let mut any = false;
+    for on in decorative {
+        if !on {
+            return false;
+        }
+        any = true;
+    }
+    any
+}
+
 fn check(ui: &mut Ui, d: &mut Dialog, label: &str, key: &str, default: bool) -> bool {
     let mut v = d.get(key, if default { "1" } else { "0" }) == "1";
     ui.checkbox(&mut v, label);
@@ -345,12 +357,21 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             ok || cancel
         }
         "altText" => {
-            let cur = app.session.active().and_then(|s| s.selected_shapes().first().map(|x| x.descr.clone())).unwrap_or_default();
+            let (cur, deco_now) = app
+                .session
+                .active()
+                .map(|s| {
+                    let shapes = s.selected_shapes();
+                    let cur = shapes.first().map(|x| x.descr.clone()).unwrap_or_default();
+                    let deco = alt_text_starts_decorative(shapes.iter().map(|x| x.decorative));
+                    (cur, deco)
+                })
+                .unwrap_or_default();
             ui.label("How would you describe this object and its context to someone who is blind or has low vision?");
             let mut v = d.get("text", &cur);
             ui.add(egui::TextEdit::multiline(&mut v).desired_rows(4).desired_width(340.0));
             d.fields.insert("text".into(), v.clone());
-            let deco = check(ui, d, "Mark as decorative", "deco", false);
+            let deco = check(ui, d, "Mark as decorative", "deco", deco_now);
             let (ok, cancel) = buttons(ui, "OK");
             if ok {
                 run(app, "shape.altText", json!({"text": v, "decorative": deco}));
@@ -829,3 +850,17 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+mod tests {
+    use super::alt_text_starts_decorative;
+
+    #[test]
+    fn decorative_starts_checked_only_when_every_shape_is() {
+        assert!(!alt_text_starts_decorative([]));
+        assert!(!alt_text_starts_decorative([false]));
+        assert!(alt_text_starts_decorative([true]));
+        assert!(alt_text_starts_decorative([true, true]));
+        assert!(!alt_text_starts_decorative([true, false]));
+    }
+}
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..d9a5e2e2 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Alt Text dialog's decorative checkbox follows the selection; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text (decorative follows the selection), Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Alt Text dialog: Mark as decorative follows the selection |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 3f82866aafc3f37b273efc16ceef61517265be9b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:20:06 +0300
Subject: [PATCH 281/376] Export: image exports keep the whole slide; partial
 failures say what was written
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The renderer caps a picture at MAX_SIDE (16,000 px) by clipping, so an image export whose
slide × scale passed that (4× of a 4032 pt slide) came out cropped. file.export and file.render
now lower the scale to fit (cmd::file::image_scale). When exporting every slide and one file
can't be written, the error says which slides already were, and slide numbers are checked
before anything is written.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/cmd/file.rs | 29 +++++++++++++++++++----------
 crates/engine/src/tests.rs    | 31 +++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 10 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..c48dd482 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -252,10 +252,19 @@ fn save_bytes_cmd(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"data": base64_encode(&bytes), "bytes": bytes.len()}))
 }
 
+/// `scale` for rendering `doc`'s slides to an image: within 0.01–16, and small enough that the
+/// slide fits the renderer's largest picture ([`deckcraft_render::MAX_SIDE`]). Past that the
+/// renderer clips, so a 4× export of a 4032 pt slide came out cropped to its first 16,000 pixels.
+pub fn image_scale(doc: &Presentation, scale: f64) -> f64 {
+    let scale = if scale.is_finite() { scale.clamp(0.01, 16.0) } else { 1.0 };
+    let longest = doc.slide_size.width.max(doc.slide_size.height).max(1.0);
+    scale.min(f64::from(deckcraft_render::MAX_SIDE) / longest)
+}
+
 /// Render slide `index` (current when absent) to PNG bytes.
 pub fn render_png(doc: &Presentation, index: usize, scale: f64, edit: bool) -> (Vec<u8>, u32, u32) {
     let img =
-        deckcraft_render::render_slide(doc, index, &deckcraft_render::RenderOpts { scale: scale.clamp(0.01, 16.0), edit, ..Default::default() });
+        deckcraft_render::render_slide(doc, index, &deckcraft_render::RenderOpts { scale: image_scale(doc, scale), edit, ..Default::default() });
     (img.to_png(), img.width, img.height)
 }
 
@@ -281,16 +290,14 @@ fn export(s: &mut Session, p: &Value) -> Result<Value> {
                 None if bool_or(p, "all", false) => (0..st.doc.slides.len()).collect(),
                 None => vec![st.selection.slide],
             };
+            // Every slide checked before any file is written, so a bad index leaves nothing behind.
+            if let Some(i) = slides.iter().find(|i| **i >= st.doc.slides.len()) {
+                return Err(bad("file.export", format!("no slide {i}")));
+            }
+            let scale = image_scale(&st.doc, scale);
             let mut written = vec![];
             for (k, i) in slides.iter().enumerate() {
-                if *i >= st.doc.slides.len() {
-                    return Err(bad("file.export", format!("no slide {i}")));
-                }
-                let img = deckcraft_render::render_slide(
-                    &st.doc,
-                    *i,
-                    &deckcraft_render::RenderOpts { scale: scale.clamp(0.01, 16.0), ..Default::default() },
-                );
+                let img = deckcraft_render::render_slide(&st.doc, *i, &deckcraft_render::RenderOpts { scale, ..Default::default() });
                 let bytes = if format == "png" { img.to_png() } else { img.to_jpeg(92) };
                 let out = if slides.len() == 1 {
                     path.clone()
@@ -300,7 +307,9 @@ fn export(s: &mut Session, p: &Value) -> Result<Value> {
                     let ext = pth.extension().map(|x| x.to_string_lossy().to_string()).unwrap_or_else(|| format.clone());
                     pth.with_file_name(format!("{stem}{}.{ext}", k + 1)).to_string_lossy().to_string()
                 };
-                write_file(&out, &bytes)?;
+                // Say which slides made it when one can't be written (disk full part-way).
+                write_file(&out, &bytes)
+                    .map_err(|e| if written.is_empty() { e } else { EngineError::Other(format!("{e} (slides 1–{k} were written)")) })?;
                 written.push(out);
             }
             Ok(json!({"files": written}))
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..b0638db2 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,34 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// Image export keeps the whole slide: the scale is lowered so the picture fits the renderer's
+/// largest side (past it the renderer clips, and big exports came out cropped).
+#[test]
+fn image_export_scale_fits_the_largest_picture() {
+    let mut s = Session::with_new();
+    let doc = s.doc().unwrap().doc.clone();
+    assert_eq!(crate::cmd::file::image_scale(&doc, 2.0), 2.0);
+    assert_eq!(crate::cmd::file::image_scale(&doc, f64::NAN), 1.0);
+    let max = f64::from(deckcraft_render::MAX_SIDE);
+    assert_eq!(crate::cmd::file::image_scale(&doc, 16.0), 16.0, "16× of 960 pt fits");
+    s.execute("design.slideSize", &json!({"w": 4032, "h": 72})).unwrap();
+    let doc = s.doc().unwrap().doc.clone();
+    let k = crate::cmd::file::image_scale(&doc, 4.0);
+    assert!(k * 4032.0 <= max + 1e-6 && k * 4032.0 > max - 1.0, "{k}");
+}
+
+/// Exporting every slide as images: when one file can't be written, the error says which
+/// slides already were.
+#[test]
+fn a_failed_all_slides_export_says_what_was_written() {
+    let dir = std::env::temp_dir().join(format!("deckcraft-export-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    std::fs::create_dir_all(dir.join("deck2.png")).unwrap();
+    let mut s = Session::with_new();
+    s.execute("slide.new", &json!({})).unwrap();
+    let e = s.execute("file.export", &json!({"path": dir.join("deck.png").to_string_lossy(), "all": true, "scale": 0.1})).unwrap_err().to_string();
+    assert!(e.contains("slides 1–1 were written"), "{e}");
+    assert!(dir.join("deck1.png").is_file());
+    let _ = std::fs::remove_dir_all(&dir);
+}

From f22ff9eb6238e6758b3e6820e4610279527e3037 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:20:38 +0300
Subject: [PATCH 282/376] Format after merging main

---
 crates/pptx/tests/chart_embed.rs | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/crates/pptx/tests/chart_embed.rs b/crates/pptx/tests/chart_embed.rs
index ed5a8def..ddf56731 100644
--- a/crates/pptx/tests/chart_embed.rs
+++ b/crates/pptx/tests/chart_embed.rs
@@ -107,11 +107,7 @@ fn an_unchanged_chart_keeps_its_embedded_workbook() {
         .expect("chart relationships");
     assert!(rels.contains("../embeddings/Microsoft_Excel_Worksheet1.xlsx"), "{rels}");
     assert!(!rels.contains("slide1.xml"), "a chart relationship must not replace the slide: {rels}");
-    let slide = saved_parts
-        .iter()
-        .find(|(n, _)| n == "ppt/slides/slide1.xml")
-        .map(|(_, d)| String::from_utf8_lossy(d).into_owned())
-        .expect("slide");
+    let slide = saved_parts.iter().find(|(n, _)| n == "ppt/slides/slide1.xml").map(|(_, d)| String::from_utf8_lossy(d).into_owned()).expect("slide");
     assert!(slide.contains("sld"), "{slide}");
     assert!(!slide.as_bytes().windows(WORKBOOK.len()).any(|w| w == WORKBOOK));
     let xml = saved_parts

From 65e465a61161957dafb15f253a6ea69b95ff7edf Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:24:47 +0300
Subject: [PATCH 283/376] UI: Create New Theme Colors dialog edits the theme in
 one step
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Design › Colors › Customize Colors… opens the dialog when design.colors
is called with no name and no colours. Save applies that scheme name and
the twelve theme colours together, as one undo.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                               |   4 +-
 crates/engine/src/cmd/design.rs          | 207 ++++++++++++++++++++---
 crates/ui-egui/src/dialogs.rs            | 120 ++++++++++++-
 crates/ui-egui/src/ribbon.rs             |   6 +
 crates/ui-egui/src/theme_colors_tests.rs | 136 +++++++++++++++
 docs/architecture.md                     |   5 +-
 docs/gaps.md                             |   9 +-
 docs/target-app-parity.md                |   7 +-
 docs/ui-parity.md                        |   9 +-
 9 files changed, 463 insertions(+), 40 deletions(-)
 create mode 100644 crates/ui-egui/src/theme_colors_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..1559e929 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors; breadth and ready percentages unchanged; previous: hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Design › Colors › Customize Colors… opens Create New Theme Colors: the open master's scheme name and twelve theme colours, applied in one undo. Command count stays 226; dialogs 27 → 28 |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Create New Theme Colors |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..9725f521 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -16,7 +16,15 @@ pub fn specs() -> Vec<CommandSpec> {
     vec![
         cmd!("design.theme", "Themes", ["Design", "Themes"], None, "{name} (see design.themes)", has_doc, theme),
         cmd!(query "design.themes", "Theme Gallery", [], None, "{} → themes, colour schemes and font schemes", always, themes),
-        cmd!("design.colors", "Colors", ["Design", "Variants"], None, "{name} | {colors: {accent1: #RRGGBB, …}}", has_doc, colors),
+        cmd!(
+            "design.colors",
+            "Colors",
+            ["Design", "Variants"],
+            None,
+            "{} opens Create New Theme Colors | {name} | {colors: {dk1|lt1|dk2|lt2|accent1..6|hlink|folHlink: #RRGGBB}}",
+            has_doc,
+            colors
+        ),
         cmd!("design.fonts", "Fonts", ["Design", "Variants"], None, "{name} | {major, minor}", has_doc, fonts),
         cmd!(
             "design.background",
@@ -95,36 +103,106 @@ fn themes(_s: &mut Session, _p: &Value) -> Result<Value> {
 }
 
 fn colors(s: &mut Session, p: &Value) -> Result<Value> {
-    let scheme = if let Some(name) = str_param(p, "name") {
-        Some(
-            builtin_color_schemes()
-                .into_iter()
-                .find(|c| c.name.eq_ignore_ascii_case(name))
-                .ok_or_else(|| bad("design.colors", format!("no colour scheme `{name}`")))?,
-        )
-    } else {
-        None
+    let name_v = p.get("name");
+    let colors_v = p.get("colors");
+    if name_v.is_none() && colors_v.is_none() {
+        let sc = current_colors(s)?;
+        s.ui_requests.push(crate::UiRequest::Dialog { id: "themeColors".into(), params: scheme_dialog_params(&sc) });
+        return ok();
+    }
+    let given = match name_v {
+        None => None,
+        Some(Value::String(n)) => {
+            let n = n.trim();
+            if n.is_empty() {
+                return Err(bad("design.colors", "name is empty"));
+            }
+            Some(n.to_string())
+        }
+        Some(_) => return Err(bad("design.colors", "`name` must be a string")),
     };
-    let custom = p.get("colors").and_then(Value::as_object).cloned();
+    let slots = parse_color_slots(colors_v)?;
+    let current = current_colors(s)?;
+    let next = next_scheme(&current, given.as_deref(), slots.as_deref())?;
+    if next == current {
+        return ok();
+    }
     s.edit(|doc, sel| {
         let mi = master_index(doc, sel);
         let m = Arc::make_mut(doc.masters.get_mut(mi).ok_or_else(|| bad("design.colors", "no master"))?);
-        if let Some(sc) = &scheme {
-            m.theme.colors = sc.clone();
-        }
-        if let Some(c) = &custom {
-            for (k, v) in c {
-                if let (Some(slot), Some(rgb)) = (deckcraft_color::SchemeSlot::from_xml(k), v.as_str().and_then(deckcraft_color::Rgba::from_hex)) {
-                    m.theme.colors.set(slot, rgb);
-                }
-            }
-            m.theme.colors.name = "Custom".into();
-        }
+        m.theme.colors = next;
         Ok(())
     })?;
     ok()
 }
 
+fn current_colors(s: &Session) -> Result<deckcraft_color::ColorScheme> {
+    let st = s.doc()?;
+    let mi = master_index(&st.doc, &st.selection);
+    st.doc.masters.get(mi).map(|m| m.theme.colors.clone()).ok_or_else(|| bad("design.colors", "no master"))
+}
+
+fn scheme_dialog_params(sc: &deckcraft_color::ColorScheme) -> Value {
+    let mut colors = serde_json::Map::new();
+    for slot in deckcraft_color::SchemeSlot::THEME {
+        colors.insert(slot.xml_name().to_string(), Value::String(format!("#{}", sc.get(slot).hex())));
+    }
+    json!({"name": sc.name, "colors": colors})
+}
+
+/// `None` when the key is absent. Present values must be the twelve stored slots; aliases such
+/// as `bg1` are rejected because `ColorScheme::set` ignores them.
+fn parse_color_slots(colors_v: Option<&Value>) -> Result<Option<Vec<(deckcraft_color::SchemeSlot, deckcraft_color::Rgba)>>> {
+    let Some(v) = colors_v else { return Ok(None) };
+    let Some(map) = v.as_object() else {
+        return Err(bad("design.colors", "`colors` must be an object"));
+    };
+    if map.is_empty() {
+        return Err(bad("design.colors", "`colors` is empty"));
+    }
+    let mut slots = Vec::with_capacity(map.len());
+    for (k, v) in map {
+        let Some(slot) = deckcraft_color::SchemeSlot::from_xml(k) else {
+            return Err(bad("design.colors", format!("unknown colour `{k}`")));
+        };
+        if !deckcraft_color::SchemeSlot::THEME.contains(&slot) {
+            return Err(bad("design.colors", format!("`{k}` is not a theme colour")));
+        }
+        let Some(rgb) = v.as_str().and_then(deckcraft_color::Rgba::from_hex) else {
+            return Err(bad("design.colors", format!("`{k}` needs a colour like #RRGGBB")));
+        };
+        slots.push((slot, rgb));
+    }
+    Ok(Some(slots))
+}
+
+/// A builtin `name` is applied first, then `colors` overlays those slots. The stored scheme name
+/// is the given name, or `Custom` when only colours are sent. An unknown name without colours is an error.
+fn next_scheme(
+    current: &deckcraft_color::ColorScheme,
+    given: Option<&str>,
+    slots: Option<&[(deckcraft_color::SchemeSlot, deckcraft_color::Rgba)]>,
+) -> Result<deckcraft_color::ColorScheme> {
+    let mut next = current.clone();
+    if let Some(name) = given {
+        if let Some(builtin) = builtin_color_schemes().into_iter().find(|c| c.name.eq_ignore_ascii_case(name)) {
+            next = builtin;
+        } else if slots.is_none() {
+            return Err(bad("design.colors", format!("no colour scheme `{name}`")));
+        }
+        next.name = name.to_string();
+    }
+    if let Some(changes) = slots {
+        for (slot, rgb) in changes {
+            next.set(*slot, *rgb);
+        }
+        if given.is_none() {
+            next.name = "Custom".into();
+        }
+    }
+    Ok(next)
+}
+
 fn fonts(s: &mut Session, p: &Value) -> Result<Value> {
     let scheme = if let Some(name) = str_param(p, "name") {
         builtin_font_schemes()
@@ -558,9 +636,94 @@ fn insert_placeholder(s: &mut Session, p: &Value) -> Result<Value> {
 
 #[cfg(test)]
 mod tests {
+    use deckcraft_color::SchemeSlot;
+    use deckcraft_model::theme::builtin_color_schemes;
+    use serde_json::{Value, json};
+
+    use crate::{Session, UiRequest};
+
+    fn scheme(s: &Session) -> deckcraft_color::ColorScheme {
+        s.doc().unwrap().doc.masters[0].theme.colors.clone()
+    }
+
+    fn undo_len(s: &Session) -> usize {
+        s.doc().unwrap().history.undo.len()
+    }
+
     #[test]
     fn civil_dates() {
         assert_eq!(super::civil(0), (1970, 1, 1));
         assert_eq!(super::civil(20_734), (2026, 10, 8));
     }
+
+    #[test]
+    fn colors_dialog_apply_and_reject() {
+        let mut s = Session::with_new();
+        let original = scheme(&s);
+        let n = undo_len(&s);
+        s.execute("design.colors", &json!({})).unwrap();
+        s.execute("design.colors", &Value::Null).unwrap();
+        assert_eq!(scheme(&s), original);
+        assert_eq!(undo_len(&s), n, "opening the dialog does not edit");
+        assert_eq!(s.ui_requests.len(), 2);
+        match &s.ui_requests[0] {
+            UiRequest::Dialog { id, params } => {
+                assert_eq!(id, "themeColors");
+                assert_eq!(params["name"], "DeckCraft");
+                let colors = params["colors"].as_object().unwrap();
+                assert_eq!(colors.len(), 12);
+                assert_eq!(colors["accent1"].as_str().unwrap(), format!("#{}", original.get(SchemeSlot::Accent1).hex()));
+                assert!(colors.contains_key("folHlink"));
+            }
+            other => panic!("expected a dialog, got {other:?}"),
+        }
+
+        s.execute("design.colors", &json!({"name": "Harbor"})).unwrap();
+        let harbor = builtin_color_schemes().into_iter().find(|c| c.name == "Harbor").unwrap();
+        assert_eq!(scheme(&s).name, "Harbor");
+        assert_eq!(scheme(&s).get(SchemeSlot::Accent1), harbor.get(SchemeSlot::Accent1));
+        assert_eq!(undo_len(&s), n + 1);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Colors");
+        s.execute("design.colors", &json!({"name": "Harbor"})).unwrap();
+        assert_eq!(undo_len(&s), n + 1, "the same scheme is not an undo step");
+
+        let err = s.execute("design.colors", &json!({"name": "Nope"})).unwrap_err().to_string();
+        assert!(err.contains("no colour scheme `Nope`"), "{err}");
+        assert!(s.execute("design.colors", &json!({"name": "  "})).is_err());
+        assert!(s.execute("design.colors", &json!({"name": 1})).is_err());
+        assert!(s.execute("design.colors", &json!({"colors": {}})).is_err());
+        assert!(s.execute("design.colors", &json!({"colors": "red"})).is_err());
+        assert!(s.execute("design.colors", &json!({"colors": {"bg1": "#112233"}})).is_err());
+        assert!(s.execute("design.colors", &json!({"colors": {"tx1": "#112233"}})).is_err());
+        assert!(s.execute("design.colors", &json!({"colors": {"phClr": "#112233"}})).is_err());
+        assert!(s.execute("design.colors", &json!({"colors": {"nope": "#112233"}})).is_err());
+        assert!(s.execute("design.colors", &json!({"colors": {"accent1": "zz"}})).is_err());
+        assert!(s.execute("design.colors", &json!({"name": "Harbor", "colors": {}})).is_err());
+        assert_eq!(scheme(&s).name, "Harbor");
+        assert_eq!(scheme(&s).get(SchemeSlot::Accent1), harbor.get(SchemeSlot::Accent1));
+        assert_eq!(undo_len(&s), n + 1);
+
+        s.execute("design.colors", &json!({"colors": {"accent1": "112233"}})).unwrap();
+        assert_eq!(scheme(&s).name, "Custom");
+        assert_eq!(scheme(&s).get(SchemeSlot::Accent1).hex(), "112233");
+        assert_eq!(scheme(&s).get(SchemeSlot::Accent2), harbor.get(SchemeSlot::Accent2));
+        assert_eq!(undo_len(&s), n + 2);
+
+        let meadow = builtin_color_schemes().into_iter().find(|c| c.name == "Meadow").unwrap();
+        s.execute("design.colors", &json!({"name": "Meadow", "colors": {"lt1": "#010203"}})).unwrap();
+        assert_eq!(scheme(&s).name, "Meadow");
+        assert_eq!(scheme(&s).get(SchemeSlot::Lt1).hex(), "010203");
+        assert_eq!(scheme(&s).get(SchemeSlot::Accent1), meadow.get(SchemeSlot::Accent1));
+        assert_eq!(undo_len(&s), n + 3);
+
+        s.execute("design.colors", &json!({"name": "Talk", "colors": {"dk1": "#ABCDEF"}})).unwrap();
+        assert_eq!(scheme(&s).name, "Talk");
+        assert_eq!(scheme(&s).get(SchemeSlot::Dk1).hex(), "ABCDEF");
+        assert_eq!(scheme(&s).get(SchemeSlot::Lt1).hex(), "010203");
+        assert_eq!(scheme(&s).get(SchemeSlot::Accent1), meadow.get(SchemeSlot::Accent1));
+
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(scheme(&s).name, "Meadow");
+        assert_eq!(scheme(&s).get(SchemeSlot::Dk1), meadow.get(SchemeSlot::Dk1));
+    }
 }
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..fa931fde 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -1,6 +1,7 @@
 //! Dialogs (Insert Table, Slide Size, Header & Footer, Hyperlink, Set Up Show, Zoom, …) and the
 //! About window. The start screen is File › Home (`backstage.rs`).
 
+use deckcraft_color::SchemeSlot;
 use egui::{Align2, Color32, CornerRadius, Rect, Sense, Stroke, Ui, pos2, vec2};
 use serde_json::{Value, json};
 
@@ -56,6 +57,7 @@ fn title(id: &str) -> &'static str {
         "trim" => "Trim Media",
         "smartart" => "Choose a SmartArt Graphic",
         "quit" => "DeckCraft",
+        "themeColors" => "Create New Theme Colors",
         _ => "DeckCraft",
     }
 }
@@ -64,16 +66,24 @@ pub fn show(app: &mut SlideApp, ctx: &egui::Context) {
     let Some(mut d) = app.dialog.take() else { return };
     let mut open = true;
     let mut close = false;
-    egui::Window::new(title(&d.id))
+    let mut window = egui::Window::new(title(&d.id))
         .id(egui::Id::new(("dialog", d.id.clone())))
         .collapsible(false)
         .resizable(false)
         .anchor(Align2::CENTER_CENTER, vec2(0.0, -40.0))
-        .open(&mut open)
-        .show(ctx, |ui| {
-            ui.set_min_width(340.0);
-            close = body(app, ui, &mut d);
-        });
+        .open(&mut open);
+    // Two columns of colour rows plus Save must fit the first frame. A later resize clips the
+    // buttons (the window size sticks) and clicks miss them.
+    if d.id == "themeColors" {
+        window = window.default_size(vec2(760.0, 420.0)).min_width(720.0).min_height(420.0);
+    }
+    window.show(ctx, |ui| {
+        ui.set_min_width(if d.id == "themeColors" { 700.0 } else { 340.0 });
+        if d.id == "themeColors" {
+            ui.set_min_height(360.0);
+        }
+        close = body(app, ui, &mut d);
+    });
     if open && !close && !ctx.input(|i| i.key_pressed(egui::Key::Escape)) {
         app.dialog = Some(d);
     }
@@ -117,6 +127,99 @@ fn num(d: &mut Dialog, key: &str, default: f64) -> f64 {
     d.get(key, "").trim().trim_end_matches(['"', '%', ' ']).parse::<f64>().ok().filter(|v| v.is_finite()).unwrap_or(default)
 }
 
+fn seed_theme_colors(d: &mut Dialog) {
+    if d.fields.contains_key("seeded") {
+        return;
+    }
+    let name = d.params.get("name").and_then(Value::as_str).unwrap_or("Custom");
+    d.fields.insert("schemeName".into(), name.to_string());
+    let obj = d.params.get("colors").and_then(Value::as_object);
+    for slot in SchemeSlot::THEME {
+        let hex = obj.and_then(|o| o.get(slot.xml_name())).and_then(Value::as_str).unwrap_or("000000");
+        d.fields.insert(slot.xml_name().into(), hex.to_string());
+    }
+    d.fields.insert("seeded".into(), "1".into());
+}
+
+fn theme_color_row(ui: &mut Ui, d: &mut Dialog, slot: SchemeSlot) {
+    let key = slot.xml_name();
+    let mut v = d.get(key, "000000");
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(188.0, 18.0), egui::Label::new(slot.label()));
+        let fill = deckcraft_color::Rgba::from_hex(&v).map(theme::to_color32).unwrap_or_else(|| Color32::from_gray(200));
+        let (rect, _) = ui.allocate_exact_size(vec2(18.0, 18.0), Sense::hover());
+        ui.painter().rect(rect, CornerRadius::same(2), fill, Stroke::new(1.0, Tokens::get(ui.ctx()).border), egui::StrokeKind::Inside);
+        let resp = ui.add(egui::TextEdit::singleline(&mut v).desired_width(84.0).id_salt(("theme-hex", key)));
+        let shown = v.clone();
+        resp.widget_info(move || {
+            let mut info = egui::WidgetInfo::labeled(egui::WidgetType::TextEdit, true, format!("{} hex", slot.label()));
+            info.current_text_value = Some(shown.clone());
+            info
+        });
+    });
+    d.fields.insert(key.into(), v);
+}
+
+fn theme_color_payload(d: &mut Dialog) -> Result<Value, String> {
+    let name = d.get("schemeName", "").trim().to_string();
+    if name.is_empty() {
+        return Err("Enter a scheme name.".into());
+    }
+    let mut colors = serde_json::Map::new();
+    for slot in SchemeSlot::THEME {
+        let raw = d.get(slot.xml_name(), "");
+        let Some(rgb) = deckcraft_color::Rgba::from_hex(raw.trim()) else {
+            return Err(format!("{} needs a colour like #RRGGBB.", slot.label()));
+        };
+        colors.insert(slot.xml_name().into(), Value::String(format!("#{}", rgb.hex())));
+    }
+    Ok(json!({"name": name, "colors": colors}))
+}
+
+/// Create New Theme Colors. Returns true when the dialog should close.
+fn theme_colors_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    seed_theme_colors(d);
+    // The window keeps the height of its contents and will not grow after the first frame, so the
+    // rows stay short enough that Save is inside that rect.
+    ui.style_mut().spacing.interact_size.y = 16.0;
+    ui.style_mut().spacing.item_spacing.y = 2.0;
+    ui.style_mut().spacing.button_padding.y = 2.0;
+    let left = [SchemeSlot::Dk1, SchemeSlot::Lt1, SchemeSlot::Dk2, SchemeSlot::Lt2, SchemeSlot::Hlink, SchemeSlot::FolHlink];
+    let right = [SchemeSlot::Accent1, SchemeSlot::Accent2, SchemeSlot::Accent3, SchemeSlot::Accent4, SchemeSlot::Accent5, SchemeSlot::Accent6];
+    egui::Grid::new("theme-colors").spacing(vec2(18.0, 4.0)).show(ui, |ui| {
+        for (a, b) in left.into_iter().zip(right) {
+            theme_color_row(ui, d, a);
+            theme_color_row(ui, d, b);
+            ui.end_row();
+        }
+    });
+    ui.add_space(6.0);
+    let mut name = d.get("schemeName", "");
+    ui.horizontal(|ui| {
+        ui.label("Name:");
+        let resp = ui.add(egui::TextEdit::singleline(&mut name).desired_width(280.0).id_salt("schemeName"));
+        let shown = name.clone();
+        resp.widget_info(move || {
+            let mut info = egui::WidgetInfo::labeled(egui::WidgetType::TextEdit, true, "Scheme name");
+            info.current_text_value = Some(shown.clone());
+            info
+        });
+    });
+    d.fields.insert("schemeName".into(), name);
+    ui.label(egui::RichText::new("Applies to this presentation's theme colours.").size(11.0).color(Tokens::get(ui.ctx()).text_dim));
+    let (ok, cancel) = buttons(ui, "Save");
+    if ok {
+        match theme_color_payload(d) {
+            Ok(payload) => return app.run("design.colors", payload).is_ok(),
+            Err(msg) => {
+                app.set_status(msg);
+                return false;
+            }
+        }
+    }
+    cancel
+}
+
 /// Returns true when the dialog should close.
 fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     let run = |app: &mut SlideApp, id: &str, p: Value| {
@@ -730,6 +833,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             let (ok, _) = buttons(ui, "Done");
             ok
         }
+        "themeColors" => theme_colors_dialog(app, ui, d),
         _ => {
             ui.label(format!("“{}” is not available yet.", d.id));
             let (ok, cancel) = buttons(ui, "OK");
@@ -829,3 +933,7 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+#[path = "theme_colors_tests.rs"]
+mod theme_colors_tests;
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..06397bfe 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1235,6 +1235,7 @@ fn design(app: &mut SlideApp, ui: &mut Ui) {
     });
     group(ui, |ui| {
         let r = big_button(ui, Icon::Colors, "Colors", true);
+        r.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, true, "Colors"));
         egui::Popup::menu(&r).width(240.0).show(|ui| {
             for cs in deckcraft_model::theme::builtin_color_schemes() {
                 ui.horizontal(|ui| {
@@ -1254,6 +1255,11 @@ fn design(app: &mut SlideApp, ui: &mut Ui) {
                     }
                 });
             }
+            ui.separator();
+            if ui.button("Customize Colors…").clicked() {
+                run(app, "design.colors", json!({}));
+                ui.close();
+            }
         });
         let r = big_button(ui, Icon::Fonts, "Fonts", true);
         egui::Popup::menu(&r).width(220.0).show(|ui| {
diff --git a/crates/ui-egui/src/theme_colors_tests.rs b/crates/ui-egui/src/theme_colors_tests.rs
new file mode 100644
index 00000000..d7dba9bb
--- /dev/null
+++ b/crates/ui-egui/src/theme_colors_tests.rs
@@ -0,0 +1,136 @@
+//! Design › Colors › Customize Colors… opens Create New Theme Colors and saves in one step.
+
+use deckcraft_color::SchemeSlot;
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.ui.tab = "Design".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1800.0, 1100.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn scheme(h: &Harness<'_, SlideApp>) -> deckcraft_color::ColorScheme {
+    h.state().session.active().unwrap().doc.masters[0].theme.colors.clone()
+}
+
+fn undo_len(h: &Harness<'_, SlideApp>) -> usize {
+    h.state().session.active().unwrap().history.undo.len()
+}
+
+fn open_dialog(h: &mut Harness<'_, SlideApp>) {
+    h.get_by_label("Colors").click();
+    h.run_steps(2);
+    h.get_by_label("Customize Colors…").click();
+    h.run_steps(3);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("themeColors"));
+}
+
+#[test]
+fn customize_colors_opens_from_the_design_tab() {
+    let mut h = harness();
+    let before = scheme(&h);
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    assert_eq!(h.get_by_label("Scheme name").value().as_deref(), Some(before.name.as_str()));
+    let accent = format!("#{}", before.get(SchemeSlot::Accent1).hex());
+    assert_eq!(h.get_by_label("Accent 1 hex").value().as_deref(), Some(accent.as_str()));
+    let _ = h.get_by_label("Text/Background - Dark 1 hex");
+    let _ = h.get_by_label("Text/Background - Light 1 hex");
+    let _ = h.get_by_label("Followed Hyperlink hex");
+    let _ = h.get_by_label("Hyperlink hex");
+    let _ = h.get_by_label("Save");
+    let _ = h.get_by_label("Cancel");
+    let save = h.get_by_label("Save").rect();
+    let win = h.get_by_label("Create New Theme Colors").rect();
+    assert!(win.contains(save.center()), "Save {save:?} is outside the dialog window {win:?}");
+    h.get_by_label("Save").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none());
+    assert_eq!(scheme(&h), before);
+    assert_eq!(undo_len(&h), n, "saving the current colours is not an undo step");
+}
+
+#[test]
+fn save_applies_the_name_and_one_colour() {
+    let mut h = harness();
+    let before = scheme(&h);
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    {
+        let d = h.state_mut().dialog.as_mut().unwrap();
+        d.fields.insert("schemeName".into(), "Talk".into());
+        d.fields.insert("accent1".into(), "#ABCDEF".into());
+    }
+    h.get_by_label("Save").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none(), "status: {:?}", h.state().status);
+    let after = scheme(&h);
+    assert_eq!(after.name, "Talk");
+    assert_eq!(after.get(SchemeSlot::Accent1).hex(), "ABCDEF");
+    assert_eq!(after.get(SchemeSlot::Dk1), before.get(SchemeSlot::Dk1));
+    assert_eq!(undo_len(&h), n + 1);
+    assert_eq!(h.state().session.active().unwrap().history.undo.last().unwrap().label, "Colors");
+}
+
+#[test]
+fn a_bad_hex_keeps_the_dialog_open() {
+    let mut h = harness();
+    let before = scheme(&h);
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    h.state_mut().dialog.as_mut().unwrap().fields.insert("accent1".into(), "zzzzzz".into());
+    h.get_by_label("Save").click();
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("themeColors"));
+    assert_eq!(scheme(&h), before);
+    assert_eq!(undo_len(&h), n);
+    let status = h.state().status.as_ref().map(|(t, _)| t.clone()).unwrap_or_default();
+    assert!(status.contains("Accent 1"), "{status}");
+}
+
+#[test]
+fn cancel_closes_without_editing() {
+    let mut h = harness();
+    let before = scheme(&h);
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    h.state_mut().dialog.as_mut().unwrap().fields.insert("accent1".into(), "#112233".into());
+    h.get_by_label("Cancel").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none());
+    assert_eq!(scheme(&h), before);
+    assert_eq!(undo_len(&h), n);
+}
+
+#[test]
+fn typing_a_hex_replaces_accent_1() {
+    let mut h = harness();
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    h.get_by_label("Accent 1 hex").click();
+    h.run_steps(1);
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::A);
+    h.run_steps(1);
+    h.get_by_label("Accent 1 hex").type_text("#11AA22");
+    h.run_steps(1);
+    let shown = h.get_by_label("Accent 1 hex").value().unwrap_or_default();
+    assert_eq!(shown, "#11AA22", "the hex field should replace its text, got {shown}");
+    h.get_by_label("Save").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none(), "status: {:?}", h.state().status);
+    assert_eq!(scheme(&h).name, "DeckCraft");
+    assert_eq!(scheme(&h).get(SchemeSlot::Accent1).hex(), "11AA22");
+    assert_eq!(undo_len(&h), n + 1);
+}
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..b2c64739 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors dialog; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -21,7 +21,7 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
 | L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
+| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Create New Theme Colors (`design.colors` with no params); command count stays 226 |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..c231878d 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors; dialogs 27 → 28; previous: 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,8 +203,10 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60. Create New Theme Colors (Design › Colors ›
+  Customize Colors…) edits the open master's twelve theme colours, not a saved library of named
+  schemes. Still missing: Font, Bullets and Numbering, Find/Replace dialog, Replace Fonts, Action
+  Settings, Print, Insert Object. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -256,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Create New Theme Colors is in (dialogs 27 → 28). Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print and Insert Object stay open |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..286a7a05 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors noted under what works today; percentages unchanged; previous: hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -211,7 +211,9 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   inheritance (slide → layout → master → theme), sections, notes, comments, custom shows,
   header/footer fields, embedded media, unlimited undo on shared slide snapshots.
 - **Themes:** 8 original themes with colour and font schemes, custom colours and fonts,
-  backgrounds (solid, gradient, picture, pattern), slide size presets.
+  backgrounds (solid, gradient, picture, pattern), slide size presets. Design › Colors ›
+  Customize Colors… opens Create New Theme Colors and edits the open master's twelve theme
+  colours (one scheme on that master, not a library of saved schemes).
 - **Shapes:** ~180 preset geometries with adjustment handles, text boxes, pictures (crop,
   corrections, animated GIFs that play and pause), tables with styles, charts (column, bar, line,
   area, pie, doughnut, scatter and more), basic SmartArt, groups, connectors glued to sites,
@@ -276,6 +278,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | What works today: Create New Theme Colors. The d556ff9 snapshot (226 commands, 27 dialogs) and the breadth / ready percentages are unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..ce26f6a5 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,8 +1,8 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages, Create New Theme Colors |
 
 ## Direct manipulation
 
@@ -137,7 +137,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 |---|---|
 | Native macOS menu bar from `menu_tree()`, filled out to PowerPoint's menu items | 3–5 |
 | Format Shape pane depth | 6–10 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
+| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object; Create New Theme Colors is in) | 8–14 |
 | Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
 | Grid Options, edit points UI, crop depth | 4–7 |
 | Multiple windows | 3–5 |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Design › Colors › Customize Colors… opens Create New Theme Colors (the open master's twelve theme colours; dialogs 27 → 28) |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From d04df05249bf03596cd409d4bc481aac86132240 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:35:37 +0300
Subject: [PATCH 284/376] Export: record slide resolution in PNG and JPEG
 pictures

A default export is 2 pixels per point. Without a resolution, Preview
treats those pixels as 72 dpi and the picture opens at twice the slide's
size. PNG pHYs and JPEG JFIF density now say scale times 72, so the
default is 144 dpi. Screenshots stay untagged.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                     |  1 +
 apps/deckcraft-cli/src/main.rs |  2 +-
 crates/engine/src/cmd/file.rs  | 25 ++++++----
 crates/engine/src/tests.rs     | 28 +++++++++++
 crates/mcp/src/headless.rs     |  2 +-
 crates/render/src/images.rs    | 91 ++++++++++++++++++++++++++++++++++
 crates/render/src/lib.rs       | 43 +++++++++++++++-
 crates/render/src/tests.rs     | 19 +++++++
 crates/ui-egui/src/lib.rs      |  6 ++-
 docs/file-format-parity.md     |  5 +-
 docs/hardware-parity.md        |  4 +-
 11 files changed, 208 insertions(+), 18 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..64c03f84 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | PNG and JPEG slide export record their resolution. The default 2 pixels per point is 144 dpi, so Preview and print show the slide's real size instead of twice that |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index fd1d96ea..91da1d5b 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -232,7 +232,7 @@ fn render_transition(args: &[String]) -> Result<(), String> {
             let name = format!("{stem}-t{t:.3}.png");
             p.with_file_name(name).to_string_lossy().into_owned()
         };
-        std::fs::write(&path, img.to_png()).map_err(|e| format!("{path}: {e}"))?;
+        std::fs::write(&path, img.to_png_at(render::dpi_for_scale(opts.scale))).map_err(|e| format!("{path}: {e}"))?;
         outln!("{path} ({}×{}) {} {} t={t}", img.width, img.height, tr.kind, tr.option);
     }
     Ok(())
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..7bf739d8 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -254,9 +254,18 @@ fn save_bytes_cmd(s: &mut Session, p: &Value) -> Result<Value> {
 
 /// Render slide `index` (current when absent) to PNG bytes.
 pub fn render_png(doc: &Presentation, index: usize, scale: f64, edit: bool) -> (Vec<u8>, u32, u32) {
-    let img =
-        deckcraft_render::render_slide(doc, index, &deckcraft_render::RenderOpts { scale: scale.clamp(0.01, 16.0), edit, ..Default::default() });
-    (img.to_png(), img.width, img.height)
+    let scale = finite_scale(scale);
+    let img = deckcraft_render::render_slide(doc, index, &deckcraft_render::RenderOpts { scale, edit, ..Default::default() });
+    (img.to_png_at(deckcraft_render::dpi_for_scale(scale)), img.width, img.height)
+}
+
+fn finite_scale(scale: f64) -> f64 {
+    if scale.is_finite() { scale.clamp(0.01, 16.0) } else { 1.0 }
+}
+
+fn picture_bytes(img: &deckcraft_render::Image, format: &str, scale: f64) -> Vec<u8> {
+    let dpi = deckcraft_render::dpi_for_scale(scale);
+    if format == "png" { img.to_png_at(dpi) } else { img.to_jpeg_at(92, Some(dpi)) }
 }
 
 fn render(s: &mut Session, p: &Value) -> Result<Value> {
@@ -273,7 +282,7 @@ fn export(s: &mut Session, p: &Value) -> Result<Value> {
     let path = str_param(p, "path").ok_or_else(|| bad("file.export", "missing `path`"))?.to_string();
     let format = str_param(p, "format").unwrap_or(format_for_path(&path)).to_string();
     let st = s.doc()?;
-    let scale = f64_or(p, "scale", 2.0);
+    let scale = finite_scale(f64_or(p, "scale", 2.0));
     match format.as_str() {
         "png" | "jpeg" | "jpg" => {
             let slides: Vec<usize> = match usize_param(p, "slide") {
@@ -286,12 +295,8 @@ fn export(s: &mut Session, p: &Value) -> Result<Value> {
                 if *i >= st.doc.slides.len() {
                     return Err(bad("file.export", format!("no slide {i}")));
                 }
-                let img = deckcraft_render::render_slide(
-                    &st.doc,
-                    *i,
-                    &deckcraft_render::RenderOpts { scale: scale.clamp(0.01, 16.0), ..Default::default() },
-                );
-                let bytes = if format == "png" { img.to_png() } else { img.to_jpeg(92) };
+                let img = deckcraft_render::render_slide(&st.doc, *i, &deckcraft_render::RenderOpts { scale, ..Default::default() });
+                let bytes = picture_bytes(&img, &format, scale);
                 let out = if slides.len() == 1 {
                     path.clone()
                 } else {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..4c3a2dc4 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,31 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// Default picture export is 2 px per point. The file says 144 dpi, so Preview shows the slide's size.
+#[test]
+fn a_png_export_records_the_slide_resolution() {
+    let mut s = session();
+    let dir = std::env::temp_dir().join(format!("deckcraft-dpi-{}", std::process::id()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let png = dir.join("slide.png");
+    s.execute("file.export", &json!({"path": png.to_str().unwrap(), "format": "png"})).unwrap();
+    let bytes = std::fs::read(&png).unwrap();
+    assert_eq!(deckcraft_render::image_dpi(&bytes), Some((144.0, 144.0)));
+    assert_eq!(png_size(&bytes), Some((1920, 1080)), "960×540 pt at 2 px per point");
+    let one = dir.join("one.png");
+    s.execute("file.export", &json!({"path": one.to_str().unwrap(), "format": "png", "scale": 1})).unwrap();
+    let one_bytes = std::fs::read(&one).unwrap();
+    assert_eq!(deckcraft_render::image_dpi(&one_bytes), Some((72.0, 72.0)));
+    assert_eq!(png_size(&one_bytes), Some((960, 540)));
+    let jpg = dir.join("slide.jpg");
+    s.execute("file.export", &json!({"path": jpg.to_str().unwrap(), "format": "jpeg"})).unwrap();
+    assert_eq!(deckcraft_render::image_dpi(&std::fs::read(&jpg).unwrap()), Some((144.0, 144.0)));
+    let _ = std::fs::remove_dir_all(&dir);
+}
+
+fn png_size(bytes: &[u8]) -> Option<(u32, u32)> {
+    let w: [u8; 4] = bytes.get(16..20)?.try_into().ok()?;
+    let h: [u8; 4] = bytes.get(20..24)?.try_into().ok()?;
+    Some((u32::from_be_bytes(w), u32::from_be_bytes(h)))
+}
diff --git a/crates/mcp/src/headless.rs b/crates/mcp/src/headless.rs
index 512e7cc4..e624b3ff 100644
--- a/crates/mcp/src/headless.rs
+++ b/crates/mcp/src/headless.rs
@@ -106,7 +106,7 @@ impl Headless {
             i,
             &deckcraft_engine::render::RenderOpts { scale, edit: p.get("edit").and_then(Value::as_bool).unwrap_or(false), ..Default::default() },
         );
-        let png = img.to_png();
+        let png = img.to_png_at(deckcraft_engine::render::dpi_for_scale(scale));
         if let Some(path) = s(p, "path") {
             std::fs::write(path, &png).map_err(|e| format!("{path}: {e}"))?;
             return Ok(json!({"path": path, "width": img.width, "height": img.height}));
diff --git a/crates/render/src/images.rs b/crates/render/src/images.rs
index f7d56c5d..fef36bcb 100644
--- a/crates/render/src/images.rs
+++ b/crates/render/src/images.rs
@@ -173,6 +173,97 @@ pub fn dpi(bytes: &[u8]) -> Option<(f64, f64)> {
     None
 }
 
+/// A copy of a PNG with a `pHYs` chunk saying `dpi` dots per inch.
+///
+/// Anything that is not a PNG, or a resolution the reader would reject, is returned unchanged.
+/// A file that already has `pHYs` is left alone.
+pub(crate) fn stamp_png_dpi(png: &[u8], dpi: f64) -> Vec<u8> {
+    let Some(ppm) = pixels_per_metre(dpi) else { return png.to_vec() };
+    let Some(end) = ihdr_end(png) else { return png.to_vec() };
+    if has_phys(png) {
+        return png.to_vec();
+    }
+    let mut body = Vec::with_capacity(13);
+    body.extend_from_slice(b"pHYs");
+    body.extend_from_slice(&ppm.to_be_bytes());
+    body.extend_from_slice(&ppm.to_be_bytes());
+    body.push(1);
+    let crc = png_crc(&body);
+    let mut out = Vec::with_capacity(png.len() + 21);
+    out.extend_from_slice(png.get(..end).unwrap_or(png));
+    out.extend_from_slice(&9u32.to_be_bytes());
+    out.extend_from_slice(&body);
+    out.extend_from_slice(&crc.to_be_bytes());
+    if let Some(rest) = png.get(end..) {
+        out.extend_from_slice(rest);
+    }
+    out
+}
+
+/// Dots per inch as pixels per metre, the unit a PNG `pHYs` chunk stores.
+fn pixels_per_metre(dpi: f64) -> Option<u32> {
+    if !dpi.is_finite() || !(1.0..=10_000.0).contains(&dpi) {
+        return None;
+    }
+    let ppm = (dpi / 0.0254).round();
+    if !ppm.is_finite() || !(1.0..=u32::MAX as f64).contains(&ppm) {
+        return None;
+    }
+    Some(ppm as u32)
+}
+
+fn ihdr_end(png: &[u8]) -> Option<usize> {
+    if !png.starts_with(b"\x89PNG\r\n\x1a\n") {
+        return None;
+    }
+    let len = be_u32(png, 8)? as usize;
+    if png.get(12..16) != Some(b"IHDR".as_slice()) {
+        return None;
+    }
+    let end = 8usize.checked_add(12)?.checked_add(len)?;
+    (end <= png.len()).then_some(end)
+}
+
+fn has_phys(png: &[u8]) -> bool {
+    let mut i = 8usize;
+    for _ in 0..64 {
+        let len = match be_u32(png, i) {
+            Some(n) => n as usize,
+            None => return false,
+        };
+        let Some(kind) = png.get(i + 4..i + 8) else { return false };
+        if kind == b"pHYs" {
+            return true;
+        }
+        if kind == b"IDAT" || kind == b"IEND" {
+            return false;
+        }
+        i = match i.checked_add(12).and_then(|n| n.checked_add(len)) {
+            Some(n) if n <= png.len() => n,
+            _ => return false,
+        };
+    }
+    false
+}
+
+fn be_u32(bytes: &[u8], i: usize) -> Option<u32> {
+    let s = bytes.get(i..i + 4)?;
+    let s: [u8; 4] = s.try_into().ok()?;
+    Some(u32::from_be_bytes(s))
+}
+
+fn png_crc(data: &[u8]) -> u32 {
+    let mut c = 0xFFFF_FFFFu32;
+    for &b in data {
+        c ^= u32::from(b);
+        for _ in 0..8 {
+            let mask = 0u32.wrapping_sub(c & 1);
+            c = (c >> 1) ^ (0xEDB8_8320 & mask);
+        }
+    }
+    !c
+}
+
 /// A premultiplied pixmap of the picture, downsampled so its longer side is near `want` px.
 pub fn decode_for(bytes: &Arc<Vec<u8>>, want: f64, adj: &PictureAdjust) -> Option<Arc<Pixmap>> {
     let addr = Arc::as_ptr(bytes) as usize;
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..b642ba90 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -89,12 +89,30 @@ impl Image {
         }
         buf
     }
+
+    /// PNG of this image whose `pHYs` chunk says `dpi` dots per inch.
+    ///
+    /// Slide space is points, 72 per inch, so a render at `scale` pixels per point is
+    /// [`dpi_for_scale`]`(scale)`. Without the chunk, Preview treats the pixels as 72 dpi and a
+    /// Retina (2×) export opens at twice the slide's size.
+    pub fn to_png_at(&self, dpi: f64) -> Vec<u8> {
+        images::stamp_png_dpi(&self.to_png(), dpi)
+    }
+
     pub fn to_jpeg(&self, quality: u8) -> Vec<u8> {
+        self.to_jpeg_at(quality, None)
+    }
+
+    /// JPEG of this image. `dpi` is stored as JFIF density in dots per inch when it is in range.
+    pub fn to_jpeg_at(&self, quality: u8, dpi: Option<f64>) -> Vec<u8> {
         let straight = self.to_straight();
         let rgb: Vec<u8> = straight.as_chunks::<4>().0.iter().flat_map(|p| [p[0], p[1], p[2]]).collect();
         let Some(img) = image::RgbImage::from_raw(self.width, self.height, rgb) else { return Vec::new() };
         let mut buf = Vec::new();
-        let enc = image::codecs::jpeg::JpegEncoder::new_with_quality(&mut buf, quality.clamp(1, 100));
+        let mut enc = image::codecs::jpeg::JpegEncoder::new_with_quality(&mut buf, quality.clamp(1, 100));
+        if let Some(d) = dpi.and_then(dpi_u16) {
+            enc.set_pixel_density(image::codecs::jpeg::PixelDensity::dpi(d));
+        }
         if let Err(e) = img.write_with_encoder(enc) {
             log::error!("JPEG encode: {e}");
             return Vec::new();
@@ -111,6 +129,29 @@ impl Image {
     }
 }
 
+/// Dots per inch for a slide drawn at `pixels_per_point`.
+///
+/// A point is 1/72 inch. The default picture export uses 2 pixels per point, which is 144 dpi:
+/// the same pixels, at the slide's real size, on a Retina display.
+pub fn dpi_for_scale(pixels_per_point: f64) -> f64 {
+    if !pixels_per_point.is_finite() || pixels_per_point <= 0.0 {
+        return 72.0;
+    }
+    (pixels_per_point * 72.0).clamp(1.0, 10_000.0)
+}
+
+fn dpi_u16(dpi: f64) -> Option<u16> {
+    if !dpi.is_finite() || !(1.0..=f64::from(u16::MAX)).contains(&dpi) {
+        return None;
+    }
+    Some(dpi.round() as u16)
+}
+
+/// Resolution a PNG (`pHYs`) or JPEG (JFIF) records, in whole dots per inch.
+pub fn image_dpi(bytes: &[u8]) -> Option<(f64, f64)> {
+    images::dpi(bytes)
+}
+
 /// Animation state of one shape during a slide show or preview.
 #[derive(Clone, Debug)]
 pub struct ShapeState {
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..582d8606 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -171,9 +171,28 @@ fn png_encodes() {
     let img = render_slide(&p, 0, &RenderOpts { scale: 0.1, ..Default::default() });
     let png = img.to_png();
     assert!(png.starts_with(&[0x89, b'P', b'N', b'G']));
+    assert_eq!(image_dpi(&png), None, "an untagged screenshot stays without a resolution");
     assert!(!img.to_jpeg(80).is_empty());
 }
 
+#[test]
+fn a_retina_export_records_144_dpi_and_still_decodes() {
+    assert_eq!(dpi_for_scale(2.0), 144.0);
+    assert_eq!(dpi_for_scale(1.0), 72.0);
+    assert_eq!(dpi_for_scale(f64::NAN), 72.0);
+    let img = Image { width: 4, height: 2, pixels: [255, 0, 0, 255].repeat(8) };
+    let png = img.to_png_at(144.0);
+    assert_eq!(image_dpi(&png), Some((144.0, 144.0)));
+    let decoded = image::load_from_memory(&png).unwrap();
+    assert_eq!((decoded.width(), decoded.height()), (4, 2));
+    let again = images::stamp_png_dpi(&png, 72.0);
+    assert_eq!(again.len(), png.len(), "a second pHYs chunk is not written");
+    assert_eq!(image_dpi(&again), Some((144.0, 144.0)));
+    let jpeg = img.to_jpeg_at(90, Some(144.0));
+    assert_eq!(image_dpi(&jpeg), Some((144.0, 144.0)));
+    assert_eq!(image_dpi(&img.to_jpeg(90)), None);
+}
+
 #[test]
 fn crop_dest_math() {
     let r = crop_dest(Rect::new(0.0, 0.0, 100.0, 100.0), [0.5, 0.0, 0.0, 0.0]);
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..68f0b231 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -388,8 +388,10 @@ impl SlideApp {
         let Some(doc) = self.session.active().map(|d| d.doc.clone()) else { return false };
         let bytes = match format {
             "png" | "jpeg" => {
-                let img = deckcraft_render::render_slide(&doc, slide, &deckcraft_render::RenderOpts { scale: 2.0, ..Default::default() });
-                Ok(if format == "png" { img.to_png() } else { img.to_jpeg(92) })
+                let scale = 2.0;
+                let img = deckcraft_render::render_slide(&doc, slide, &deckcraft_render::RenderOpts { scale, ..Default::default() });
+                let dpi = deckcraft_render::dpi_for_scale(scale);
+                Ok(if format == "png" { img.to_png_at(dpi) } else { img.to_jpeg_at(92, Some(dpi)) })
             }
             "pdf" => deckcraft_engine::cmd::file::pdf_bytes(&doc, &extra),
             other => deckcraft_engine::cmd::file::save_bytes(&doc, other),
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e888c7a..eb8b034b 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,6 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a PNG or JPEG slide export records its resolution, so the default 2× picture is 144 dpi; previous: groups with a small legacy child coordinate space draw outlines at their own width, #233) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -26,7 +26,7 @@ PowerPoint opens and saves; Viewer = opens only).
 | `.deckcraft` native (zip + JSON) | n/a | yes (also `.slidecraft`) | yes | Lossless for the DeckCraft model, forward compatible | `crates/format` tests |
 | PDF | export | no | yes | Slides, notes pages, handouts (1–9); real-text layer with embedded subsets, links, bookmarks. Slide artwork is a raster image at print resolution, not vector | `crates/pdf` tests |
 | Outline `.rtf` / `.txt` | export (RTF), import (outline) | `.txt`/`.md` outline (`slide.fromOutline`) | `.txt` outline | No RTF | engine tests |
-| PNG / JPEG slide images | export | n/a | yes (`file.export`, `deckcraft-cli render`) | Matches the editor's renderer | render tests |
+| PNG / JPEG slide images | export | n/a | yes (`file.export`, `deckcraft-cli render`) | Matches the editor's renderer. PNG `pHYs` and JPEG JFIF density are `scale` × 72 dpi (default scale 2 is 144 dpi), so Preview shows the slide's real size | render and engine tests |
 | TIFF / BMP / GIF slide images | export | n/a | no | Easy (the `image` crate writes them) | none |
 | Animated GIF of the deck | export | n/a | no | | none |
 | MP4 / MOV video of the deck | export | n/a | no | Needs timeline render + H.264 encode | none |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | PNG and JPEG slide export record their resolution (`scale` × 72 dpi; the default 2× picture is 144 dpi) |
 | 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
 | 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
 | 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
diff --git a/docs/hardware-parity.md b/docs/hardware-parity.md
index 5ba34cfc..67bc8639 100644
--- a/docs/hardware-parity.md
+++ b/docs/hardware-parity.md
@@ -1,6 +1,6 @@
 # Hardware parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (PNG and JPEG slide export record 144 dpi at the default 2 pixels per point; previous: IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 
 What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
 ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -14,6 +14,7 @@ because it mostly follows from hardware use.
 | Slide rasterization | GPU | **CPU** (`vello_cpu`) | CPU | CPU | CPU (wasm) |
 | Transitions and Morph frames | GPU | CPU-rendered slide images composited as textured quads on the GPU | same | same | same |
 | High-DPI / Retina | yes | yes | yes | yes | yes |
+| Picture export resolution | 2 px per point, tagged so the file is the slide's size | PNG `pHYs` and JPEG density, 144 dpi at the default 2 px per point | same | same | same |
 | Wide gamut / HDR display | partly (P3 images) | no (sRGB) | no | no | no |
 | Startup on all GPUs | yes | yes | **no**: crashes in some Intel/AMD drivers (#40, #59) | not reported | n/a |
 | Software fallback when no GPU | yes (WARP on Windows) | no | no | no | no |
@@ -71,5 +72,6 @@ outlines every frame (#67, fix open), and the decoders run in software.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | PNG and JPEG slide export record 144 dpi at the default 2 pixels per point, so a Retina picture opens at the slide's size |
 | 2026-10-12 | minor | IME input methods (#101) |
 | 2026-10-10 | major | Created: rendering, media, displays, input and performance against PowerPoint 16.113 |

From 8c0147cfa7a9d74e3a77bf411fcefc5475a1841d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:40:06 +0300
Subject: [PATCH 285/376] UI: Hyperlink dialog follows the selection

Insert Hyperlink opened on https:// with an empty ScreenTip, so OK
replaced a web address, email, slide link or tip. The dialog now
starts from the link it would edit, and leaves actions it cannot
edit in place.
---
 ROADMAP.md                      |   4 +-
 crates/engine/src/cmd/insert.rs |   4 +-
 crates/engine/src/cmd/text.rs   |   5 +-
 crates/engine/src/tests.rs      |  16 ++
 crates/ui-egui/src/dialogs.rs   | 348 ++++++++++++++++++++++++++++++--
 docs/ui-parity.md               |   5 +-
 6 files changed, 363 insertions(+), 19 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..0a76a4e3 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Hyperlink dialog follows the selection; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Insert Hyperlink: address, email, slide and ScreenTip open from the selection, so OK no longer replaces them with `https://` and an empty tip |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Hyperlink dialog follows the selection |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 2643ab11..75b85fed 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -54,7 +54,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Link",
             ["Insert", "Links"],
             Some("Cmd+K"),
-            "{url? | slide?: index, tooltip?, text?: shown when nothing is selected, ids?}",
+            "{url? | slide?: index, tooltip?, text?: shown when nothing is selected, highlightClick?, ids?}",
             has_text_or_shapes,
             hyperlink
         ),
@@ -589,7 +589,7 @@ fn hyperlink(s: &mut Session, p: &Value) -> Result<Value> {
         return Err(bad("insert.hyperlink", "missing `url` or `slide`"));
     };
     let display = str_param(p, "text").map_or(display, str::to_string);
-    let link = Hyperlink { action, tooltip: str_param(p, "tooltip").unwrap_or("").to_string(), highlight_click: false };
+    let link = Hyperlink { action, tooltip: str_param(p, "tooltip").unwrap_or("").to_string(), highlight_click: bool_or(p, "highlightClick", false) };
     if s.doc()?.selection.text.is_some() {
         return super::text::link_text(s, link, &display);
     }
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 1b2cb2d2..05274b7e 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -790,8 +790,9 @@ pub(crate) fn format_run(s: &mut Session, f: &(dyn Fn(&mut RunProps) + Send + Sy
 }
 
 /// What `format_run` formats while editing: the selection, or for a bare caret the word it's in
-/// (without its trailing space). Empty when the caret is at a word boundary.
-fn format_range(st: &DocState, t: &TextSel) -> (Pos, Pos) {
+/// (without its trailing space). Empty when the caret is at a word boundary. Insert Hyperlink
+/// edits this same span, so the dialog reads it too.
+pub fn format_range(st: &DocState, t: &TextSel) -> (Pos, Pos) {
     let body = body_of(st, t).cloned().unwrap_or_default();
     let (mut a, mut b) = t.ordered();
     if a == b {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..48dca837 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -504,6 +504,22 @@ fn hyperlink_on_a_word_or_shape_links_it() {
     assert!(s.doc().unwrap().current_slide().unwrap().shapes[0].click.is_some(), "a selected shape gets the link as its click action");
 }
 
+#[test]
+fn hyperlink_can_keep_highlight_click() {
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+    s.execute("text.edit", &json!({"id": title})).unwrap();
+    s.execute("text.exit", &json!({})).unwrap();
+    s.execute("insert.hyperlink", &json!({"url": "https://example.org", "tooltip": "tip", "highlightClick": true})).unwrap();
+    let click = s.doc().unwrap().current_slide().unwrap().shapes[0].click.clone().unwrap();
+    assert_eq!(click.tooltip, "tip");
+    assert!(click.highlight_click);
+    assert_eq!(click.action, model::text::Action::Url { url: "https://example.org".into() });
+    s.execute("insert.hyperlink", &json!({"url": "https://example.org"})).unwrap();
+    let click = s.doc().unwrap().current_slide().unwrap().shapes[0].click.clone().unwrap();
+    assert!(!click.highlight_click, "omitting the flag still stores false");
+}
+
 /// A .pptx (base64) whose first slide's title is set in `font`.
 fn deck_in_font(font: &str) -> String {
     let mut p = deckcraft_model::Presentation::default();
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..2deadf5b 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -117,6 +117,186 @@ fn num(d: &mut Dialog, key: &str, default: f64) -> f64 {
     d.get(key, "").trim().trim_end_matches(['"', '%', ' ']).parse::<f64>().ok().filter(|v| v.is_finite()).unwrap_or(default)
 }
 
+/// What Insert Hyperlink would edit on the current selection.
+#[derive(Clone, Debug, PartialEq)]
+enum CurrentLink {
+    /// Nothing is linked. OK sets a new link (a caret at a word boundary inserts text).
+    None,
+    /// One link covers the text span or every selected shape.
+    One(deckcraft_model::text::Hyperlink),
+    /// The selection mixes different links. OK must not replace them until a new target is chosen.
+    Mixed,
+}
+
+/// Fields the Insert Hyperlink dialog opens with.
+#[derive(Clone, Debug, PartialEq)]
+struct HyperlinkSeed {
+    /// `url`, `email` or `slide`.
+    mode: &'static str,
+    url: String,
+    email: String,
+    slide: usize,
+    tip: String,
+    highlight: bool,
+    /// The action is not a web address, email or slide this dialog edits (or the selection mixes
+    /// links). OK leaves it in place until the user picks a different target.
+    preserve: bool,
+}
+
+impl HyperlinkSeed {
+    /// A new link: the address starts at `https://`, as the dialog always did.
+    fn blank() -> Self {
+        HyperlinkSeed { mode: "url", url: "https://".into(), email: String::new(), slide: 0, tip: String::new(), highlight: false, preserve: false }
+    }
+}
+
+/// Turn one hyperlink into dialog fields. A slide that is no longer in the deck, and actions this
+/// dialog does not edit (next slide, a program, …), are preserved so OK does not retarget them.
+fn seed_of_link(link: &deckcraft_model::text::Hyperlink, slide_ids: &[deckcraft_model::SlideId]) -> HyperlinkSeed {
+    use deckcraft_model::text::Action;
+    let mut seed = HyperlinkSeed {
+        mode: "url",
+        url: String::new(),
+        email: String::new(),
+        slide: 0,
+        tip: link.tooltip.clone(),
+        highlight: link.highlight_click,
+        preserve: true,
+    };
+    match &link.action {
+        Action::Url { url } => {
+            seed.preserve = false;
+            if let Some(email) = url.strip_prefix("mailto:") {
+                seed.mode = "email";
+                seed.email = email.to_string();
+                seed.url = "https://".into();
+            } else {
+                seed.url = url.clone();
+            }
+        }
+        Action::Slide { slide } => {
+            if let Some(i) = slide_ids.iter().position(|id| id == slide) {
+                seed.preserve = false;
+                seed.mode = "slide";
+                seed.slide = i;
+                seed.url = "https://".into();
+            }
+        }
+        _ => {}
+    }
+    seed
+}
+
+fn seed_from(current: CurrentLink, slide_ids: &[deckcraft_model::SlideId]) -> HyperlinkSeed {
+    match current {
+        CurrentLink::None => HyperlinkSeed::blank(),
+        CurrentLink::Mixed => HyperlinkSeed { preserve: true, url: String::new(), ..HyperlinkSeed::blank() },
+        CurrentLink::One(link) => seed_of_link(&link, slide_ids),
+    }
+}
+
+/// Links on the half-open span `[a, b)`. A point span is a new link: Insert Hyperlink inserts
+/// there instead of editing a neighbouring run.
+fn link_covering(body: &deckcraft_model::text::TextBody, a: (usize, usize), b: (usize, usize)) -> CurrentLink {
+    if a == b {
+        return CurrentLink::None;
+    }
+    let mut seen: Option<Option<deckcraft_model::text::Hyperlink>> = None;
+    for (pi, para) in body.paragraphs.iter().enumerate() {
+        if pi < a.0 || pi > b.0 {
+            continue;
+        }
+        let from = if pi == a.0 { a.1 } else { 0 };
+        let to = if pi == b.0 { b.1 } else { usize::MAX };
+        if from >= to {
+            continue;
+        }
+        let mut acc = 0usize;
+        let mut covered = false;
+        for run in &para.runs {
+            let len = run.char_len();
+            let end = acc + len;
+            if len > 0 && end > from && acc < to {
+                covered = true;
+                match &seen {
+                    None => seen = Some(run.props.link.clone()),
+                    Some(prev) if prev == &run.props.link => {}
+                    Some(_) => return CurrentLink::Mixed,
+                }
+            }
+            acc = end;
+        }
+        if !covered && para.char_len() == 0 {
+            match &seen {
+                None => seen = Some(para.end_props.link.clone()),
+                Some(prev) if prev == &para.end_props.link => {}
+                Some(_) => return CurrentLink::Mixed,
+            }
+        }
+    }
+    match seen {
+        Some(Some(link)) => CurrentLink::One(link),
+        _ => CurrentLink::None,
+    }
+}
+
+fn common_click(clicks: impl IntoIterator<Item = Option<deckcraft_model::text::Hyperlink>>) -> CurrentLink {
+    let mut clicks = clicks.into_iter();
+    let Some(first) = clicks.next() else { return CurrentLink::None };
+    for next in clicks {
+        if next != first {
+            return CurrentLink::Mixed;
+        }
+    }
+    match first {
+        Some(link) => CurrentLink::One(link),
+        None => CurrentLink::None,
+    }
+}
+
+/// The link Insert Hyperlink would edit: text when a caret or selection is active, otherwise the
+/// click action shared by the selected shapes.
+fn hyperlink_seed_of(st: Option<&deckcraft_engine::DocState>) -> HyperlinkSeed {
+    let Some(st) = st else { return HyperlinkSeed::blank() };
+    let ids: Vec<deckcraft_model::SlideId> = st.doc.slides.iter().map(|s| s.id).collect();
+    let current = if let Some(t) = &st.selection.text {
+        match deckcraft_engine::cmd::text::body_of(st, t) {
+            Some(body) => {
+                let (a, b) = deckcraft_engine::cmd::text::format_range(st, t);
+                link_covering(body, a, b)
+            }
+            None => CurrentLink::None,
+        }
+    } else {
+        common_click(st.selected_shapes().into_iter().map(|sh| sh.click.clone()))
+    };
+    seed_from(current, &ids)
+}
+
+/// OK writes a link unless the dialog is holding an action it does not edit and the user has not
+/// chosen a new target.
+fn hyperlink_should_apply(seed: &HyperlinkSeed, mode: &str, url: &str, email: &str, slide: usize) -> bool {
+    if !seed.preserve {
+        return true;
+    }
+    if mode != seed.mode {
+        return true;
+    }
+    match mode {
+        "email" => email != seed.email,
+        "slide" => slide != seed.slide,
+        _ => url != seed.url,
+    }
+}
+
+fn hyperlink_command(mode: &str, url: &str, email: &str, slide: usize, tip: &str, highlight: bool) -> Value {
+    match mode {
+        "slide" => json!({"slide": slide, "tooltip": tip, "highlightClick": highlight}),
+        "email" => json!({"url": format!("mailto:{email}"), "tooltip": tip, "highlightClick": highlight}),
+        _ => json!({"url": url, "tooltip": tip, "highlightClick": highlight}),
+    }
+}
+
 /// Returns true when the dialog should close.
 fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     let run = |app: &mut SlideApp, id: &str, p: Value| {
@@ -186,7 +366,9 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             apply || apply_all || d.fields.contains_key("cancel")
         }
         "hyperlink" => {
-            let mode = d.get("mode", "url");
+            let seed = hyperlink_seed_of(app.session.active());
+            let slide_default = seed.slide.to_string();
+            let mode = d.get("mode", seed.mode);
             ui.horizontal(|ui| {
                 if ui.selectable_label(mode == "url", "Web Page or File").clicked() {
                     d.fields.insert("mode".into(), "url".into());
@@ -205,7 +387,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                         .active()
                         .map(|s| s.doc.slides.iter().enumerate().map(|(i, sl)| format!("{}. {}", i + 1, sl.title())).collect())
                         .unwrap_or_default();
-                    let sel = d.get("slide", "0").parse::<usize>().unwrap_or(0);
+                    let sel = d.get("slide", &slide_default).parse::<usize>().unwrap_or(0);
                     egui::ScrollArea::vertical().max_height(180.0).show(ui, |ui| {
                         for (i, t) in titles.iter().enumerate() {
                             if ui.selectable_label(sel == i, t).clicked() {
@@ -214,19 +396,20 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                         }
                     });
                 }
-                "email" => field(ui, d, "Email address:", "email", ""),
-                _ => field(ui, d, "Address:", "url", "https://"),
+                "email" => field(ui, d, "Email address:", "email", &seed.email),
+                _ => field(ui, d, "Address:", "url", &seed.url),
             }
-            field(ui, d, "ScreenTip:", "tip", "");
+            field(ui, d, "ScreenTip:", "tip", &seed.tip);
             let (ok, cancel) = buttons(ui, "OK");
             if ok {
-                let tip = d.get("tip", "");
-                let p = match mode.as_str() {
-                    "slide" => json!({"slide": d.get("slide", "0").parse::<usize>().unwrap_or(0), "tooltip": tip}),
-                    "email" => json!({"url": format!("mailto:{}", d.get("email", "")), "tooltip": tip}),
-                    _ => json!({"url": d.get("url", ""), "tooltip": tip}),
-                };
-                run(app, "insert.hyperlink", p);
+                let mode_now = d.get("mode", seed.mode);
+                let url = d.get("url", &seed.url);
+                let email = d.get("email", &seed.email);
+                let slide = d.get("slide", &slide_default).parse::<usize>().unwrap_or(0);
+                let tip = d.get("tip", &seed.tip);
+                if hyperlink_should_apply(&seed, &mode_now, &url, &email, slide) {
+                    run(app, "insert.hyperlink", hyperlink_command(&mode_now, &url, &email, slide, &tip, seed.highlight));
+                }
             }
             ok || cancel
         }
@@ -829,3 +1012,144 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+mod tests {
+    use deckcraft_model::text::{Action, Hyperlink, Run, TextBody};
+    use deckcraft_model::{Presentation, SlideId};
+
+    use super::{
+        CurrentLink, HyperlinkSeed, common_click, hyperlink_command, hyperlink_seed_of, hyperlink_should_apply, link_covering, seed_from,
+        seed_of_link,
+    };
+
+    fn link(action: Action, tip: &str) -> Hyperlink {
+        Hyperlink { action, tooltip: tip.into(), highlight_click: false }
+    }
+
+    fn url(address: &str, tip: &str) -> Hyperlink {
+        let mut h = link(Action::Url { url: address.into() }, tip);
+        h.highlight_click = tip == "glow";
+        h
+    }
+
+    #[test]
+    fn no_link_opens_as_a_new_web_address() {
+        let seed = seed_from(CurrentLink::None, &[]);
+        assert_eq!(seed, HyperlinkSeed::blank());
+        assert!(hyperlink_should_apply(&seed, "url", "https://", "", 0));
+    }
+
+    #[test]
+    fn web_email_and_slide_links_fill_the_dialog() {
+        let ids = [SlideId(7), SlideId(9)];
+        let web = seed_of_link(&url("https://example.org", "See"), &ids);
+        assert_eq!(web.mode, "url");
+        assert_eq!(web.url, "https://example.org");
+        assert_eq!(web.tip, "See");
+        assert!(!web.preserve);
+        assert!(hyperlink_should_apply(&web, "url", "https://example.org", "", 0));
+
+        let mail = seed_of_link(&url("mailto:a@b.org", "Write"), &ids);
+        assert_eq!(mail.mode, "email");
+        assert_eq!(mail.email, "a@b.org");
+        assert_eq!(mail.tip, "Write");
+        assert_eq!(hyperlink_command("email", "", "a@b.org", 0, "Write", false)["url"], "mailto:a@b.org");
+
+        let slide = seed_of_link(&link(Action::Slide { slide: SlideId(9) }, "There"), &ids);
+        assert_eq!(slide.mode, "slide");
+        assert_eq!(slide.slide, 1);
+        assert_eq!(slide.tip, "There");
+        assert!(!slide.preserve);
+
+        let glow = url("https://example.org", "glow");
+        assert!(glow.highlight_click);
+        assert!(seed_of_link(&glow, &ids).highlight);
+        assert_eq!(hyperlink_command("url", "https://example.org", "", 0, "glow", true)["highlightClick"], true);
+    }
+
+    #[test]
+    fn actions_this_dialog_does_not_edit_survive_ok() {
+        let next = seed_of_link(&link(Action::NextSlide, "On"), &[]);
+        assert!(next.preserve);
+        assert_eq!(next.tip, "On");
+        assert_eq!(next.url, "");
+        assert!(!hyperlink_should_apply(&next, "url", "", "", 0));
+        assert!(hyperlink_should_apply(&next, "url", "https://example.org", "", 0));
+
+        let gone = seed_of_link(&link(Action::Slide { slide: SlideId(99) }, ""), &[SlideId(1)]);
+        assert!(gone.preserve, "a missing slide is not retargeted to the first slide");
+        assert!(!hyperlink_should_apply(&gone, "url", "", "", 0));
+
+        let mixed = seed_from(CurrentLink::Mixed, &[]);
+        assert!(mixed.preserve);
+        assert!(!hyperlink_should_apply(&mixed, "url", "", "", 0));
+        assert!(hyperlink_should_apply(&mixed, "email", "", "a@b.org", 0));
+    }
+
+    #[test]
+    fn a_text_span_reports_the_link_it_covers() {
+        let mut body = TextBody::from_text("Hello world");
+        body.paragraphs[0].runs.clear();
+        body.paragraphs[0].runs.push(Run::new("Hello "));
+        let mut world = Run::new("world");
+        world.props.link = Some(url("https://example.org", "tip"));
+        body.paragraphs[0].runs.push(world);
+
+        assert_eq!(link_covering(&body, (0, 6), (0, 6)), CurrentLink::None, "a caret inserts; it does not edit the run beside it");
+        match link_covering(&body, (0, 6), (0, 11)) {
+            CurrentLink::One(h) => assert_eq!(h.tooltip, "tip"),
+            other => panic!("linked word, got {other:?}"),
+        }
+        assert_eq!(link_covering(&body, (0, 0), (0, 11)), CurrentLink::Mixed);
+
+        let mut other = url("https://example.org", "tip");
+        other.tooltip = "other".into();
+        assert_eq!(common_click([None, None]), CurrentLink::None);
+        assert!(matches!(common_click([Some(url("https://example.org", "tip"))]), CurrentLink::One(_)));
+        assert_eq!(common_click([Some(url("https://example.org", "tip")), Some(other)]), CurrentLink::Mixed);
+        assert_eq!(common_click(std::iter::empty()), CurrentLink::None);
+    }
+
+    #[test]
+    fn the_open_dialog_reads_the_caret_word_and_the_shape_click() {
+        let mut doc = Presentation::default();
+        let shape_id = {
+            let slide = std::sync::Arc::make_mut(&mut doc.slides[0]);
+            let mut body = TextBody::from_text("Hello world");
+            body.paragraphs[0].runs.clear();
+            body.paragraphs[0].runs.push(Run::new("Hello "));
+            let mut world = Run::new("world");
+            world.props.link = Some(url("https://example.org", "tip"));
+            body.paragraphs[0].runs.push(world);
+            slide.shapes[0].text = Some(body);
+            slide.shapes[0].id
+        };
+        let mut st = deckcraft_engine::DocState::new(doc, None, "t".into());
+        st.selection.text = Some(deckcraft_engine::TextSel { shape: shape_id, anchor: (0, 8), caret: (0, 8), ..Default::default() });
+        let seed = hyperlink_seed_of(Some(&st));
+        assert_eq!(seed.mode, "url");
+        assert_eq!(seed.url, "https://example.org");
+        assert_eq!(seed.tip, "tip");
+        assert!(!seed.preserve);
+
+        st.selection.text = None;
+        st.selection.shapes = vec![shape_id];
+        {
+            let doc = std::sync::Arc::make_mut(&mut st.doc);
+            let slide = std::sync::Arc::make_mut(&mut doc.slides[0]);
+            let shape = slide.shapes.iter_mut().find(|sh| sh.id == shape_id).unwrap();
+            let mut click = url("https://shape.example", "shape tip");
+            click.highlight_click = true;
+            shape.click = Some(click);
+        }
+        let seed = hyperlink_seed_of(Some(&st));
+        assert_eq!(seed.url, "https://shape.example");
+        assert_eq!(seed.tip, "shape tip");
+        assert!(seed.highlight);
+
+        st.selection.text = Some(deckcraft_engine::TextSel { shape: shape_id, anchor: (0, 11), caret: (0, 11), ..Default::default() });
+        let seed = hyperlink_seed_of(Some(&st));
+        assert_eq!(seed, HyperlinkSeed::blank(), "a caret at the end of the word inserts a new link");
+    }
+}
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..7d4ac20b 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Hyperlink dialog follows the selection; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink (address, slide and ScreenTip follow the selection), Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Hyperlink dialog: address, email, slide and ScreenTip follow the selection |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 6b0c1db6ed47f0dcc4e3a5f69b43f680c111d3c1 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:41:01 +0300
Subject: [PATCH 286/376] PPTX: the notes master's own placeholders and colour
 map are kept on save

---
 crates/pptx/src/write/mod.rs   | 23 ++++++++++++++++++-----
 crates/pptx/tests/roundtrip.rs | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 5 deletions(-)

diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 7fb6a713..225ce0c8 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -434,8 +434,8 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         master_rids.push((master_id, pres.rels.add("slideMaster", &opc::relative("ppt/presentation.xml", &mname), false)));
     }
 
-    // Notes master when any slide has notes.
-    let has_notes = p.slides.iter().any(|s| !s.notes.is_empty());
+    // Notes master when the deck has one or any slide has notes.
+    let has_notes = p.notes_master.is_some() || p.slides.iter().any(|s| !s.notes.is_empty());
     let notes_master = "ppt/notesMasters/notesMaster1.xml";
     let mut notes_master_rid = None;
     if has_notes {
@@ -449,9 +449,22 @@ pub fn export(p: &Presentation) -> Result<Vec<u8>, PptxError> {
         x.pkg.rels(&tname, &to.rels);
         let mut w = W::new();
         root_open(&mut w, "p:notesMaster", A::new());
-        let bg = Background::Ref { idx: 1001, color: deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Bg1) };
-        csld(&mut w, &mut x, &mut no, "", Some(&bg), &notes_master_shapes(p.notes_size));
-        clr_map(&mut w, &[]);
+        let nm = p.notes_master.as_deref();
+        let bg = nm
+            .and_then(|m| m.background.clone())
+            .unwrap_or(Background::Ref { idx: 1001, color: deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Bg1) });
+        // The file's own placeholders are kept; PowerPoint's defaults only when it has none.
+        let own = nm.map(|m| m.shapes.as_slice()).filter(|s| !s.is_empty());
+        let defaults;
+        let list = match own {
+            Some(s) => s,
+            None => {
+                defaults = notes_master_shapes(p.notes_size);
+                defaults.as_slice()
+            }
+        };
+        csld(&mut w, &mut x, &mut no, "", Some(&bg), list);
+        clr_map(&mut w, nm.map(|m| m.color_map.as_slice()).unwrap_or(&[]));
         dml::list_style(&mut w, &mut x, &mut no, "p:notesStyle", &notes_style());
         w.close("p:notesMaster");
         x.pkg.xml_part(notes_master, CT_NOTES_MASTER, w.finish());
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..6729ddf4 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,37 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+#[test]
+fn notes_master_placeholders_and_colour_map_survive_save() {
+    let mut p = defaults::new_presentation(None);
+    let mut box1 = shape(&mut p, "Confidential", 100000.0, 200000.0, 3000000.0, 400000.0);
+    box1.text = Some(TextBody::from_text("Company confidential"));
+    let map: Vec<(String, String)> = [("bg1", "dk1"), ("tx1", "lt1"), ("bg2", "dk2"), ("tx2", "lt2")]
+        .iter()
+        .chain(
+            [
+                ("accent1", "accent1"),
+                ("accent2", "accent2"),
+                ("accent3", "accent3"),
+                ("accent4", "accent4"),
+                ("accent5", "accent5"),
+                ("accent6", "accent6"),
+                ("hlink", "hlink"),
+                ("folHlink", "folHlink"),
+            ]
+            .iter(),
+        )
+        .map(|(a, b)| (a.to_string(), b.to_string()))
+        .collect();
+    let m = deckcraft_model::Master { name: "Notes Master".into(), shapes: vec![box1], color_map: map.clone(), ..Default::default() };
+    p.notes_master = Some(Arc::new(m));
+    // No slide has notes: the notes master must still be written.
+    let q = round(&p);
+    let nm = q.notes_master.as_deref().expect("notes master kept");
+    assert_eq!(nm.shapes.len(), 1, "own shapes, not the defaults");
+    let sh = &nm.shapes[0];
+    assert_eq!(sh.name, "Confidential");
+    assert_eq!(sh.text.as_ref().map(|t| t.text()), Some("Company confidential".to_string()));
+    assert_eq!(nm.color_map, map);
+}

From 0fcaabc37077a56242fc6a254a978eab0efef844 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:45:53 +0300
Subject: [PATCH 287/376] UI: Create New Theme Fonts dialog edits the theme in
 one step
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Design › Fonts › Customize Fonts… opens Create New Theme Fonts.
Empty design.fonts params open the dialog; a name and heading or body
faces apply to the open master in one undo.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                              |   4 +-
 crates/engine/src/cmd/design.rs         | 216 ++++++++++++++++++++++--
 crates/ui-egui/src/dialogs.rs           | 137 ++++++++++++++-
 crates/ui-egui/src/ribbon.rs            |   6 +
 crates/ui-egui/src/theme_fonts_tests.rs | 136 +++++++++++++++
 docs/architecture.md                    |   5 +-
 docs/gaps.md                            |  10 +-
 docs/target-app-parity.md               |   8 +-
 docs/ui-parity.md                       |   9 +-
 9 files changed, 499 insertions(+), 32 deletions(-)
 create mode 100644 crates/ui-egui/src/theme_fonts_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..cb45e090 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts; breadth and ready percentages unchanged; previous: hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Design › Fonts › Customize Fonts… opens Create New Theme Fonts: the open master's scheme name and its heading and body latin faces, applied in one undo. Command count stays 226; dialogs 27 → 28 |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Create New Theme Fonts |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..eef7773c 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -17,7 +17,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!("design.theme", "Themes", ["Design", "Themes"], None, "{name} (see design.themes)", has_doc, theme),
         cmd!(query "design.themes", "Theme Gallery", [], None, "{} → themes, colour schemes and font schemes", always, themes),
         cmd!("design.colors", "Colors", ["Design", "Variants"], None, "{name} | {colors: {accent1: #RRGGBB, …}}", has_doc, colors),
-        cmd!("design.fonts", "Fonts", ["Design", "Variants"], None, "{name} | {major, minor}", has_doc, fonts),
+        cmd!("design.fonts", "Fonts", ["Design", "Variants"], None, "{} opens Create New Theme Fonts | {name} | {major, minor}", has_doc, fonts),
         cmd!(
             "design.background",
             "Format Background",
@@ -126,28 +126,109 @@ fn colors(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 fn fonts(s: &mut Session, p: &Value) -> Result<Value> {
-    let scheme = if let Some(name) = str_param(p, "name") {
-        builtin_font_schemes()
-            .into_iter()
-            .find(|f| f.name.eq_ignore_ascii_case(name))
-            .ok_or_else(|| bad("design.fonts", format!("no font scheme `{name}`")))?
-    } else {
-        let major = str_param(p, "major").ok_or_else(|| bad("design.fonts", "give `name`, or `major` and `minor`"))?;
-        let minor = str_param(p, "minor").unwrap_or(major);
-        deckcraft_model::theme::FontScheme {
-            name: "Custom".into(),
-            major: deckcraft_model::theme::FontSet { latin: major.into(), ..Default::default() },
-            minor: deckcraft_model::theme::FontSet { latin: minor.into(), ..Default::default() },
+    let name_v = p.get("name");
+    let major_v = p.get("major");
+    let minor_v = p.get("minor");
+    if name_v.is_none() && major_v.is_none() && minor_v.is_none() {
+        let scheme = current_fonts(s)?;
+        s.ui_requests.push(crate::UiRequest::Dialog { id: "themeFonts".into(), params: font_dialog_params(&scheme) });
+        return ok();
+    }
+    let given = match name_v {
+        None => None,
+        Some(Value::String(n)) => {
+            let n = n.trim();
+            if n.is_empty() {
+                return Err(bad("design.fonts", "name is empty"));
+            }
+            Some(n.to_string())
         }
+        Some(_) => return Err(bad("design.fonts", "`name` must be a string")),
     };
+    let major = face_param("major", major_v)?;
+    let minor = face_param("minor", minor_v)?;
+    let current = current_fonts(s)?;
+    let next = next_font_scheme(&current, given.as_deref(), major.as_deref(), minor.as_deref())?;
+    if next == current {
+        return ok();
+    }
     s.edit(|doc, sel| {
         let mi = master_index(doc, sel);
-        Arc::make_mut(doc.masters.get_mut(mi).ok_or_else(|| bad("design.fonts", "no master"))?).theme.fonts = scheme;
+        Arc::make_mut(doc.masters.get_mut(mi).ok_or_else(|| bad("design.fonts", "no master"))?).theme.fonts = next;
         Ok(())
     })?;
     ok()
 }
 
+fn current_fonts(s: &Session) -> Result<deckcraft_model::theme::FontScheme> {
+    let st = s.doc()?;
+    let mi = master_index(&st.doc, &st.selection);
+    st.doc.masters.get(mi).map(|m| m.theme.fonts.clone()).ok_or_else(|| bad("design.fonts", "no master"))
+}
+
+fn font_dialog_params(scheme: &deckcraft_model::theme::FontScheme) -> Value {
+    json!({"name": scheme.name, "major": scheme.major.latin, "minor": scheme.minor.latin})
+}
+
+/// `None` when the key is absent. A present face must be a non-blank string.
+fn face_param(key: &str, v: Option<&Value>) -> Result<Option<String>> {
+    match v {
+        None => Ok(None),
+        Some(Value::String(s)) => {
+            let s = s.trim();
+            if s.is_empty() { Err(bad("design.fonts", format!("`{key}` is empty"))) } else { Ok(Some(s.to_string())) }
+        }
+        Some(_) => Err(bad("design.fonts", format!("`{key}` must be a string"))),
+    }
+}
+
+/// A builtin `name` is applied first, then `major` / `minor` replace only the latin faces (East
+/// Asian, complex-script and per-script slots stay). The stored name is the given string when
+/// faces are overlaid or the name is not a builtin; a name-only builtin keeps its own name.
+/// Faces without a name are a custom scheme: an omitted `minor` copies `major`.
+fn next_font_scheme(
+    current: &deckcraft_model::theme::FontScheme,
+    given: Option<&str>,
+    major: Option<&str>,
+    minor: Option<&str>,
+) -> Result<deckcraft_model::theme::FontScheme> {
+    let mut next = current.clone();
+    if let Some(name) = given {
+        let replaced = if let Some(builtin) = builtin_font_schemes().into_iter().find(|f| f.name.eq_ignore_ascii_case(name)) {
+            next = builtin;
+            true
+        } else {
+            false
+        };
+        if !replaced && major.is_none() && minor.is_none() {
+            return Err(bad("design.fonts", format!("no font scheme `{name}`")));
+        }
+        if major.is_some() || minor.is_some() || !replaced {
+            next.name = name.to_string();
+        }
+    }
+    if given.is_none() {
+        if let Some(face) = major {
+            next.major.latin = face.to_string();
+            if minor.is_none() {
+                next.minor.latin = face.to_string();
+            }
+        }
+        if let Some(face) = minor {
+            next.minor.latin = face.to_string();
+        }
+        next.name = "Custom".into();
+    } else {
+        if let Some(face) = major {
+            next.major.latin = face.to_string();
+        }
+        if let Some(face) = minor {
+            next.minor.latin = face.to_string();
+        }
+    }
+    Ok(next)
+}
+
 fn background(s: &mut Session, p: &Value) -> Result<Value> {
     let bg: Option<Background> = if bool_or(p, "reset", false) {
         None
@@ -558,9 +639,116 @@ fn insert_placeholder(s: &mut Session, p: &Value) -> Result<Value> {
 
 #[cfg(test)]
 mod tests {
+    use deckcraft_model::theme::{FontScheme, ScriptFont, builtin_font_schemes};
+    use serde_json::{Value, json};
+
+    use crate::{Session, UiRequest};
+
+    fn scheme(s: &Session) -> FontScheme {
+        s.doc().unwrap().doc.masters[0].theme.fonts.clone()
+    }
+
+    fn undo_len(s: &Session) -> usize {
+        s.doc().unwrap().history.undo.len()
+    }
+
     #[test]
     fn civil_dates() {
         assert_eq!(super::civil(0), (1970, 1, 1));
         assert_eq!(super::civil(20_734), (2026, 10, 8));
     }
+
+    #[test]
+    fn fonts_dialog_apply_and_reject() {
+        let mut s = Session::with_new();
+        let original = scheme(&s);
+        let n = undo_len(&s);
+        s.execute("design.fonts", &json!({})).unwrap();
+        s.execute("design.fonts", &Value::Null).unwrap();
+        s.execute("design.fonts", &json!([1, 2])).unwrap();
+        assert_eq!(scheme(&s), original);
+        assert_eq!(undo_len(&s), n, "opening the dialog does not edit");
+        assert_eq!(s.ui_requests.len(), 3);
+        match &s.ui_requests[0] {
+            UiRequest::Dialog { id, params } => {
+                assert_eq!(id, "themeFonts");
+                assert_eq!(params["name"], original.name);
+                assert_eq!(params["major"], original.major.latin);
+                assert_eq!(params["minor"], original.minor.latin);
+            }
+            other => panic!("expected a dialog, got {other:?}"),
+        }
+
+        s.execute("design.fonts", &json!({"name": "classic"})).unwrap();
+        let classic = builtin_font_schemes().into_iter().find(|f| f.name == "Classic").unwrap();
+        assert_eq!(scheme(&s), classic, "a builtin name keeps that scheme, including its own name");
+        assert_eq!(undo_len(&s), n + 1);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Fonts");
+        s.execute("design.fonts", &json!({"name": "Classic"})).unwrap();
+        assert_eq!(undo_len(&s), n + 1, "the same scheme is not an undo step");
+
+        let err = s.execute("design.fonts", &json!({"name": "Nope"})).unwrap_err().to_string();
+        assert!(err.contains("no font scheme `Nope`"), "{err}");
+        assert!(s.execute("design.fonts", &json!({"name": "  "})).is_err());
+        assert!(s.execute("design.fonts", &json!({"name": 1})).is_err());
+        assert!(s.execute("design.fonts", &json!({"major": ""})).is_err());
+        assert!(s.execute("design.fonts", &json!({"major": "  "})).is_err());
+        assert!(s.execute("design.fonts", &json!({"minor": 1})).is_err());
+        assert!(s.execute("design.fonts", &json!({"name": "Classic", "major": ""})).is_err());
+        assert_eq!(scheme(&s), classic);
+        assert_eq!(undo_len(&s), n + 1);
+
+        s.edit(|doc, _| {
+            let fonts = &mut std::sync::Arc::make_mut(&mut doc.masters[0]).theme.fonts;
+            fonts.major.ea = "EA Major".into();
+            fonts.minor.cs = "CS Minor".into();
+            fonts.major.scripts.push(ScriptFont { script: "Arab".into(), typeface: "Noto Naskh Arabic".into() });
+            Ok(())
+        })
+        .unwrap();
+        let marked = scheme(&s);
+        let n = undo_len(&s);
+
+        s.execute("design.fonts", &json!({"major": " Lato "})).unwrap();
+        let custom = scheme(&s);
+        assert_eq!(custom.name, "Custom");
+        assert_eq!(custom.major.latin, "Lato");
+        assert_eq!(custom.minor.latin, "Lato", "an omitted minor copies major");
+        assert_eq!(custom.major.ea, "EA Major");
+        assert_eq!(custom.minor.cs, "CS Minor");
+        assert_eq!(custom.major.scripts, marked.major.scripts);
+        assert_eq!(undo_len(&s), n + 1);
+
+        s.execute("design.fonts", &json!({"minor": "Roboto"})).unwrap();
+        assert_eq!(scheme(&s).name, "Custom");
+        assert_eq!(scheme(&s).major.latin, "Lato");
+        assert_eq!(scheme(&s).minor.latin, "Roboto");
+        assert_eq!(scheme(&s).major.ea, "EA Major");
+        assert_eq!(undo_len(&s), n + 2);
+
+        s.execute("design.fonts", &json!({"name": "Classic", "major": "Inter"})).unwrap();
+        assert_eq!(scheme(&s).name, "Classic");
+        assert_eq!(scheme(&s).major.latin, "Inter");
+        assert_eq!(scheme(&s).minor.latin, "Open Sans");
+        assert_eq!(scheme(&s).major.ea, "");
+        assert!(scheme(&s).major.scripts.is_empty(), "a builtin is applied before the latin overlay");
+        assert_eq!(undo_len(&s), n + 3);
+
+        s.edit(|doc, _| {
+            std::sync::Arc::make_mut(&mut doc.masters[0]).theme.fonts.major.ea = "Kept".into();
+            Ok(())
+        })
+        .unwrap();
+        s.execute("design.fonts", &json!({"name": "Talk", "minor": "Nunito Sans"})).unwrap();
+        assert_eq!(scheme(&s).name, "Talk");
+        assert_eq!(scheme(&s).major.latin, "Inter");
+        assert_eq!(scheme(&s).minor.latin, "Nunito Sans");
+        assert_eq!(scheme(&s).major.ea, "Kept");
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Fonts");
+
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert_eq!(scheme(&s).name, "Classic");
+        assert_eq!(scheme(&s).major.ea, "Kept");
+        assert_eq!(scheme(&s).minor.latin, "Open Sans");
+    }
 }
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..cfb09cd6 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -56,6 +56,7 @@ fn title(id: &str) -> &'static str {
         "trim" => "Trim Media",
         "smartart" => "Choose a SmartArt Graphic",
         "quit" => "DeckCraft",
+        "themeFonts" => "Create New Theme Fonts",
         _ => "DeckCraft",
     }
 }
@@ -64,16 +65,24 @@ pub fn show(app: &mut SlideApp, ctx: &egui::Context) {
     let Some(mut d) = app.dialog.take() else { return };
     let mut open = true;
     let mut close = false;
-    egui::Window::new(title(&d.id))
+    let mut window = egui::Window::new(title(&d.id))
         .id(egui::Id::new(("dialog", d.id.clone())))
         .collapsible(false)
         .resizable(false)
         .anchor(Align2::CENTER_CENTER, vec2(0.0, -40.0))
-        .open(&mut open)
-        .show(ctx, |ui| {
-            ui.set_min_width(340.0);
-            close = body(app, ui, &mut d);
-        });
+        .open(&mut open);
+    // Save must fit the first frame. A non-resizable window keeps that size, so a later
+    // content growth clips the buttons and clicks miss them.
+    if d.id == "themeFonts" {
+        window = window.default_size(vec2(460.0, 320.0)).min_width(420.0).min_height(300.0);
+    }
+    window.show(ctx, |ui| {
+        ui.set_min_width(if d.id == "themeFonts" { 400.0 } else { 340.0 });
+        if d.id == "themeFonts" {
+            ui.set_min_height(280.0);
+        }
+        close = body(app, ui, &mut d);
+    });
     if open && !close && !ctx.input(|i| i.key_pressed(egui::Key::Escape)) {
         app.dialog = Some(d);
     }
@@ -117,6 +126,117 @@ fn num(d: &mut Dialog, key: &str, default: f64) -> f64 {
     d.get(key, "").trim().trim_end_matches(['"', '%', ' ']).parse::<f64>().ok().filter(|v| v.is_finite()).unwrap_or(default)
 }
 
+fn seed_theme_fonts(d: &mut Dialog) {
+    if d.fields.contains_key("seeded") {
+        return;
+    }
+    let name = d.params.get("name").and_then(Value::as_str).unwrap_or("Custom");
+    let major = d.params.get("major").and_then(Value::as_str).unwrap_or("Inter");
+    let minor = d.params.get("minor").and_then(Value::as_str).unwrap_or(major);
+    d.fields.insert("schemeName".into(), name.to_string());
+    d.fields.insert("major".into(), major.to_string());
+    d.fields.insert("minor".into(), minor.to_string());
+    d.fields.insert("seeded".into(), "1".into());
+}
+
+fn theme_font_choices(app: &SlideApp, selected: &str) -> Vec<String> {
+    let mut v = crate::ribbon::font_families(app);
+    for scheme in deckcraft_model::theme::builtin_font_schemes() {
+        v.push(scheme.major.latin);
+        v.push(scheme.minor.latin);
+    }
+    if !selected.is_empty() {
+        v.push(selected.to_string());
+    }
+    let mut seen = std::collections::HashSet::new();
+    v.retain(|face| !face.is_empty() && seen.insert(face.clone()));
+    v
+}
+
+fn font_combo(ui: &mut Ui, label: &str, choices: &[String], selected: &mut String) {
+    let resp = egui::ComboBox::from_id_salt(label).selected_text(selected.as_str()).width(240.0).show_ui(ui, |ui| {
+        for face in choices {
+            if ui.selectable_label(selected == face, face).clicked() {
+                *selected = face.clone();
+            }
+        }
+    });
+    let shown = selected.clone();
+    let access = label.to_string();
+    resp.response.widget_info(move || {
+        let mut info = egui::WidgetInfo::labeled(egui::WidgetType::ComboBox, true, access.clone());
+        info.current_text_value = Some(shown.clone());
+        info
+    });
+}
+
+fn theme_font_payload(d: &mut Dialog) -> Result<Value, String> {
+    let name = d.get("schemeName", "").trim().to_string();
+    if name.is_empty() {
+        return Err("Enter a scheme name.".into());
+    }
+    let major = d.get("major", "").trim().to_string();
+    if major.is_empty() {
+        return Err("Choose a heading font.".into());
+    }
+    let minor = d.get("minor", "").trim().to_string();
+    if minor.is_empty() {
+        return Err("Choose a body font.".into());
+    }
+    Ok(json!({"name": name, "major": major, "minor": minor}))
+}
+
+/// Create New Theme Fonts. Returns true when the dialog should close.
+fn theme_fonts_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
+    seed_theme_fonts(d);
+    let major = d.get("major", "Inter");
+    let minor = d.get("minor", "Inter");
+    let headings = theme_font_choices(app, &major);
+    let bodies = theme_font_choices(app, &minor);
+    let mut major = major;
+    let mut minor = minor;
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(110.0, 18.0), egui::Label::new("Heading:"));
+        font_combo(ui, "Heading font", &headings, &mut major);
+    });
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(110.0, 18.0), egui::Label::new("Body:"));
+        font_combo(ui, "Body font", &bodies, &mut minor);
+    });
+    d.fields.insert("major".into(), major.clone());
+    d.fields.insert("minor".into(), minor.clone());
+    ui.add_space(4.0);
+    // Theme faces are not egui families; naming an unbound family panics. The lines show the
+    // chosen names at heading and body sizes.
+    ui.label(egui::RichText::new(format!("Heading sample  {major}")).size(20.0));
+    ui.label(egui::RichText::new(format!("Body sample  {minor}")).size(14.0));
+    ui.add_space(4.0);
+    let mut name = d.get("schemeName", "");
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(110.0, 18.0), egui::Label::new("Name:"));
+        let resp = ui.add(egui::TextEdit::singleline(&mut name).desired_width(240.0).id_salt("schemeName"));
+        let shown = name.clone();
+        resp.widget_info(move || {
+            let mut info = egui::WidgetInfo::labeled(egui::WidgetType::TextEdit, true, "Scheme name");
+            info.current_text_value = Some(shown.clone());
+            info
+        });
+    });
+    d.fields.insert("schemeName".into(), name);
+    ui.label(egui::RichText::new("Heading and body fonts for this presentation.").size(11.0).color(Tokens::get(ui.ctx()).text_dim));
+    let (ok, cancel) = buttons(ui, "Save");
+    if ok {
+        match theme_font_payload(d) {
+            Ok(payload) => return app.run("design.fonts", payload).is_ok(),
+            Err(msg) => {
+                app.set_status(msg);
+                return false;
+            }
+        }
+    }
+    cancel
+}
+
 /// Returns true when the dialog should close.
 fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     let run = |app: &mut SlideApp, id: &str, p: Value| {
@@ -730,6 +850,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             let (ok, _) = buttons(ui, "Done");
             ok
         }
+        "themeFonts" => theme_fonts_dialog(app, ui, d),
         _ => {
             ui.label(format!("“{}” is not available yet.", d.id));
             let (ok, cancel) = buttons(ui, "OK");
@@ -829,3 +950,7 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+#[path = "theme_fonts_tests.rs"]
+mod theme_fonts_tests;
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..3aa73691 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1256,12 +1256,18 @@ fn design(app: &mut SlideApp, ui: &mut Ui) {
             }
         });
         let r = big_button(ui, Icon::Fonts, "Fonts", true);
+        r.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, true, "Fonts"));
         egui::Popup::menu(&r).width(220.0).show(|ui| {
             for fs in deckcraft_model::theme::builtin_font_schemes() {
                 if ui.button(format!("{}\n   {} / {}", fs.name, fs.major.latin, fs.minor.latin)).clicked() {
                     run(app, "design.fonts", json!({"name": fs.name}));
                 }
             }
+            ui.separator();
+            if ui.button("Customize Fonts…").clicked() {
+                run(app, "design.fonts", json!({}));
+                ui.close();
+            }
         });
         let r = big_button(ui, Icon::BackgroundStyles, "Background\nStyles", true);
         egui::Popup::menu(&r).show(|ui| {
diff --git a/crates/ui-egui/src/theme_fonts_tests.rs b/crates/ui-egui/src/theme_fonts_tests.rs
new file mode 100644
index 00000000..adee8b99
--- /dev/null
+++ b/crates/ui-egui/src/theme_fonts_tests.rs
@@ -0,0 +1,136 @@
+//! Design › Fonts › Customize Fonts… opens Create New Theme Fonts and saves in one step.
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.ui.tab = "Design".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1800.0, 1100.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn scheme(h: &Harness<'_, SlideApp>) -> deckcraft_model::theme::FontScheme {
+    h.state().session.active().unwrap().doc.masters[0].theme.fonts.clone()
+}
+
+fn undo_len(h: &Harness<'_, SlideApp>) -> usize {
+    h.state().session.active().unwrap().history.undo.len()
+}
+
+fn open_dialog(h: &mut Harness<'_, SlideApp>) {
+    h.get_by_label("Fonts").click();
+    h.run_steps(2);
+    h.get_by_label("Customize Fonts…").click();
+    h.run_steps(3);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("themeFonts"));
+}
+
+#[test]
+fn customize_fonts_opens_from_the_design_tab() {
+    let mut h = harness();
+    let before = scheme(&h);
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    assert_eq!(h.get_by_label("Scheme name").value().as_deref(), Some(before.name.as_str()));
+    assert_eq!(h.get_by_label("Heading font").value().as_deref(), Some(before.major.latin.as_str()));
+    assert_eq!(h.get_by_label("Body font").value().as_deref(), Some(before.minor.latin.as_str()));
+    let _ = h.get_by_label(&format!("Heading sample  {}", before.major.latin));
+    let _ = h.get_by_label(&format!("Body sample  {}", before.minor.latin));
+    let _ = h.get_by_label("Save");
+    let _ = h.get_by_label("Cancel");
+    let save = h.get_by_label("Save").rect();
+    let win = h.get_by_label("Create New Theme Fonts").rect();
+    assert!(win.contains(save.center()), "Save {save:?} is outside the dialog window {win:?}");
+    h.get_by_label("Save").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none());
+    assert_eq!(scheme(&h), before);
+    assert_eq!(undo_len(&h), n, "saving the current fonts is not an undo step");
+}
+
+#[test]
+fn save_applies_the_name_and_both_faces() {
+    let mut h = harness();
+    let before = scheme(&h);
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    {
+        let d = h.state_mut().dialog.as_mut().unwrap();
+        d.fields.insert("schemeName".into(), "Talk".into());
+        d.fields.insert("major".into(), "Lato".into());
+        d.fields.insert("minor".into(), "Roboto".into());
+    }
+    h.get_by_label("Save").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none(), "status: {:?}", h.state().status);
+    let after = scheme(&h);
+    assert_eq!(after.name, "Talk");
+    assert_eq!(after.major.latin, "Lato");
+    assert_eq!(after.minor.latin, "Roboto");
+    assert_eq!(after.major.ea, before.major.ea);
+    assert_eq!(undo_len(&h), n + 1);
+    assert_eq!(h.state().session.active().unwrap().history.undo.last().unwrap().label, "Fonts");
+}
+
+#[test]
+fn a_blank_heading_keeps_the_dialog_open() {
+    let mut h = harness();
+    let before = scheme(&h);
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    h.state_mut().dialog.as_mut().unwrap().fields.insert("major".into(), "  ".into());
+    h.get_by_label("Save").click();
+    h.run_steps(2);
+    assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("themeFonts"));
+    assert_eq!(scheme(&h), before);
+    assert_eq!(undo_len(&h), n);
+    let status = h.state().status.as_ref().map(|(t, _)| t.clone()).unwrap_or_default();
+    assert!(status.contains("heading"), "{status}");
+}
+
+#[test]
+fn cancel_closes_without_editing() {
+    let mut h = harness();
+    let before = scheme(&h);
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    h.state_mut().dialog.as_mut().unwrap().fields.insert("major".into(), "Lato".into());
+    h.get_by_label("Cancel").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none());
+    assert_eq!(scheme(&h), before);
+    assert_eq!(undo_len(&h), n);
+}
+
+#[test]
+fn typing_a_name_replaces_the_scheme_name() {
+    let mut h = harness();
+    let n = undo_len(&h);
+    open_dialog(&mut h);
+    h.get_by_label("Scheme name").click();
+    h.run_steps(1);
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::A);
+    h.run_steps(1);
+    h.get_by_label("Scheme name").type_text("Talk");
+    h.run_steps(1);
+    let shown = h.get_by_label("Scheme name").value().unwrap_or_default();
+    assert_eq!(shown, "Talk", "the name field should replace its text, got {shown}");
+    h.get_by_label("Save").click();
+    h.run_steps(2);
+    assert!(h.state().dialog.is_none(), "status: {:?}", h.state().status);
+    assert_eq!(scheme(&h).name, "Talk");
+    assert_eq!(scheme(&h).major.latin, "Inter");
+    assert_eq!(scheme(&h).minor.latin, "Inter");
+    assert_eq!(undo_len(&h), n + 1);
+}
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..44eeb63d 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts dialog; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -21,7 +21,7 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
 | L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
+| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Create New Theme Fonts (`design.fonts` with no params); command count stays 226 |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..b8ca46b4 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts; dialogs 27 → 28; previous: 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -203,8 +203,11 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
+- **Dialogs**: 28 dialogs vs PowerPoint's ~60. Create New Theme Fonts (Design › Fonts ›
+  Customize Fonts…) edits the open master's heading and body latin faces and the scheme name.
+  It is not a saved library of theme fonts, and it does not pick East Asian or complex-script
+  faces. Still missing: Font, Bullets and Numbering, Find/Replace dialog, Replace Fonts, Action
+  Settings, Print, Insert Object. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -256,6 +259,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Create New Theme Fonts is in (dialogs 27 → 28): heading and body latin on the open master. Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print and Insert Object stay open |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..12464ef1 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts noted under what works today; percentages unchanged; previous: hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -211,7 +211,10 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   inheritance (slide → layout → master → theme), sections, notes, comments, custom shows,
   header/footer fields, embedded media, unlimited undo on shared slide snapshots.
 - **Themes:** 8 original themes with colour and font schemes, custom colours and fonts,
-  backgrounds (solid, gradient, picture, pattern), slide size presets.
+  backgrounds (solid, gradient, picture, pattern), slide size presets. Design › Fonts ›
+  Customize Fonts… opens Create New Theme Fonts and edits the open master's heading and body
+  latin faces (one scheme on that master, not a library of saved font schemes, and not East
+  Asian or complex-script faces).
 - **Shapes:** ~180 preset geometries with adjustment handles, text boxes, pictures (crop,
   corrections, animated GIFs that play and pause), tables with styles, charts (column, bar, line,
   area, pie, doughnut, scatter and more), basic SmartArt, groups, connectors glued to sites,
@@ -276,6 +279,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | What works today: Create New Theme Fonts. The d556ff9 snapshot (226 commands, 27 dialogs) and the breadth / ready percentages are unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..fd9b72ea 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,8 +1,8 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages, Create New Theme Fonts |
 
 ## Direct manipulation
 
@@ -137,7 +137,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 |---|---|
 | Native macOS menu bar from `menu_tree()`, filled out to PowerPoint's menu items | 3–5 |
 | Format Shape pane depth | 6–10 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
+| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object; Create New Theme Fonts is in) | 8–14 |
 | Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
 | Grid Options, edit points UI, crop depth | 4–7 |
 | Multiple windows | 3–5 |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Design › Fonts › Customize Fonts… opens Create New Theme Fonts (heading and body latin on the open master; dialogs 27 → 28) |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 256612b232fc7d219d24dd924cd8b7c5fa5331c5 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:54:32 +0300
Subject: [PATCH 288/376] UI: Trim Media dialog follows the selection

Trim Media opened at zero for start, end and both fades, so OK
cleared a clip that was already trimmed. The fields now start from
the selected audio or video.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                    |   4 +-
 crates/ui-egui/src/dialogs.rs | 114 ++++++++++++++++++++++++++++++++--
 docs/ui-parity.md             |   5 +-
 3 files changed, 115 insertions(+), 8 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..f6505018 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Trim Media dialog follows the selection; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Trim Media: start, end and fades open from the selected clip, so OK no longer resets them to zero |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Trim Media dialog follows the selection |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index d1934be9..85a5f900 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -117,6 +117,57 @@ fn num(d: &mut Dialog, key: &str, default: f64) -> f64 {
     d.get(key, "").trim().trim_end_matches(['"', '%', ' ']).parse::<f64>().ok().filter(|v| v.is_finite()).unwrap_or(default)
 }
 
+/// Seconds for a Trim Media field. Three decimal places, trailing zeros dropped, so the text
+/// round-trips the millisecond value the clip stores.
+fn ms_as_seconds(ms: u32) -> String {
+    let s = format!("{:.3}", f64::from(ms) / 1000.0);
+    let trimmed = s.trim_end_matches('0').trim_end_matches('.');
+    if trimmed.is_empty() { "0".to_string() } else { trimmed.to_string() }
+}
+
+/// Parse a seconds field back to milliseconds. Blank, junk and negatives become 0; the result is
+/// rounded so `0.333` is 333 ms, not 332.
+fn seconds_text_to_ms(text: &str) -> u32 {
+    let v = text.trim().parse::<f64>().ok().filter(|v| v.is_finite()).unwrap_or(0.0);
+    let ms = (v.max(0.0) * 1000.0).round();
+    if ms >= f64::from(u32::MAX) { u32::MAX } else { ms as u32 }
+}
+
+/// Start, end trim, fade in and fade out, as the Trim Media dialog shows them.
+struct TrimSeed {
+    start: String,
+    end: String,
+    fade_in: String,
+    fade_out: String,
+}
+
+impl TrimSeed {
+    fn zeros() -> Self {
+        TrimSeed { start: "0".into(), end: "0".into(), fade_in: "0".into(), fade_out: "0".into() }
+    }
+    fn from_clip(m: &deckcraft_model::MediaClip) -> Self {
+        TrimSeed {
+            start: ms_as_seconds(m.trim_start_ms),
+            end: ms_as_seconds(m.trim_end_ms),
+            fade_in: ms_as_seconds(m.fade_in_ms),
+            fade_out: ms_as_seconds(m.fade_out_ms),
+        }
+    }
+}
+
+/// The first selected audio or video. Other shapes in the selection are skipped. No media means
+/// the old zeros, which OK then stores.
+fn trim_seed(st: Option<&deckcraft_engine::DocState>) -> TrimSeed {
+    let Some(st) = st else { return TrimSeed::zeros() };
+    st.selected_shapes()
+        .into_iter()
+        .find_map(|sh| match &sh.kind {
+            deckcraft_model::ShapeKind::Media(m) => Some(TrimSeed::from_clip(m)),
+            _ => None,
+        })
+        .unwrap_or_else(TrimSeed::zeros)
+}
+
 /// Returns true when the dialog should close.
 fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     let run = |app: &mut SlideApp, id: &str, p: Value| {
@@ -646,16 +697,22 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
             ok || cancel
         }
         "trim" => {
-            field(ui, d, "Start time (s):", "start", "0");
-            field(ui, d, "End trim (s):", "end", "0");
-            field(ui, d, "Fade in (s):", "fin", "0");
-            field(ui, d, "Fade out (s):", "fout", "0");
+            let seed = trim_seed(app.session.active());
+            field(ui, d, "Start time (s):", "start", &seed.start);
+            field(ui, d, "End trim (s):", "end", &seed.end);
+            field(ui, d, "Fade in (s):", "fin", &seed.fade_in);
+            field(ui, d, "Fade out (s):", "fout", &seed.fade_out);
             let (ok, cancel) = buttons(ui, "OK");
             if ok {
                 run(
                     app,
                     "media.options",
-                    json!({"trimStart": (num(d, "start", 0.0) * 1000.0) as u64, "trimEnd": (num(d, "end", 0.0) * 1000.0) as u64, "fadeIn": (num(d, "fin", 0.0) * 1000.0) as u64, "fadeOut": (num(d, "fout", 0.0) * 1000.0) as u64}),
+                    json!({
+                        "trimStart": seconds_text_to_ms(&d.get("start", &seed.start)),
+                        "trimEnd": seconds_text_to_ms(&d.get("end", &seed.end)),
+                        "fadeIn": seconds_text_to_ms(&d.get("fin", &seed.fade_in)),
+                        "fadeOut": seconds_text_to_ms(&d.get("fout", &seed.fade_out)),
+                    }),
                 );
             }
             ok || cancel
@@ -829,3 +886,50 @@ pub fn paint_logo(p: &egui::Painter, r: Rect) {
         Stroke::NONE,
     ));
 }
+
+#[cfg(test)]
+mod tests {
+    use std::sync::Arc;
+
+    use deckcraft_model::{MediaClip, Presentation, ShapeId, ShapeKind};
+
+    use super::{ms_as_seconds, seconds_text_to_ms, trim_seed};
+
+    #[test]
+    fn trim_seconds_round_trip_the_stored_milliseconds() {
+        for ms in [0, 1, 250, 333, 1000, 1500, 60_000] {
+            let text = ms_as_seconds(ms);
+            assert_eq!(seconds_text_to_ms(&text), ms, "{text}");
+        }
+        assert_eq!(seconds_text_to_ms(""), 0);
+        assert_eq!(seconds_text_to_ms("nope"), 0);
+        assert_eq!(seconds_text_to_ms("-2"), 0);
+        assert_eq!(seconds_text_to_ms("1.5"), 1500);
+        assert_eq!(seconds_text_to_ms("999999999"), u32::MAX);
+    }
+
+    #[test]
+    fn trim_dialog_reads_the_selected_clip() {
+        assert_eq!(trim_seed(None).start, "0");
+        let mut doc = Presentation::default();
+        let media_id = {
+            let slide = Arc::make_mut(&mut doc.slides[0]);
+            let title = slide.shapes[0].id;
+            let clip = MediaClip { trim_start_ms: 1500, trim_end_ms: 250, fade_in_ms: 333, fade_out_ms: 1000, ..Default::default() };
+            let mut media = slide.shapes[0].clone();
+            media.id = ShapeId(900);
+            media.kind = ShapeKind::Media(clip);
+            slide.shapes.push(media);
+            (title, ShapeId(900))
+        };
+        let mut st = deckcraft_engine::DocState::new(doc, None, "t".into());
+        st.selection.shapes = vec![media_id.0];
+        assert_eq!(trim_seed(Some(&st)).start, "0", "a title shape is not a clip");
+        st.selection.shapes = vec![media_id.0, media_id.1];
+        let seed = trim_seed(Some(&st));
+        assert_eq!(seed.start, "1.5");
+        assert_eq!(seed.end, "0.25");
+        assert_eq!(seed.fade_in, "0.333");
+        assert_eq!(seed.fade_out, "1");
+    }
+}
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..1064be49 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Trim Media dialog follows the selection; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -64,7 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media (start, end and fades follow the selection), SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Trim Media dialog: start, end and fades follow the selected clip |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From c4a9f25754708d3c14dd4c701abb6f1378aea780 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 05:58:30 +0300
Subject: [PATCH 289/376] Charts: a chart frame with no width no longer panics

---
 crates/render/src/chart.rs |  6 ++---
 crates/render/src/tests.rs | 48 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index eb2b0a96..2b8763ca 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -264,9 +264,9 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
     } else if c.y_hidden {
         base * 0.5
     } else {
-        label_w(false, (min, max, step)).clamp(base * 1.5, area.width() * 0.3)
+        label_w(false, (min, max, step)).min(area.width() * 0.3).max(base * 1.5)
     };
-    let gutter_r = second.filter(|_| !c.y2_hidden).map(|sc| label_w(true, sc).clamp(base * 1.5, area.width() * 0.3)).unwrap_or(0.0);
+    let gutter_r = second.filter(|_| !c.y2_hidden).map(|sc| label_w(true, sc).min(area.width() * 0.3).max(base * 1.5)).unwrap_or(0.0);
     let plot = if horiz {
         Rect::new(area.x0 + gutter, area.y0, area.x1, area.y1 - base * 1.6)
     } else {
@@ -378,7 +378,7 @@ pub fn draw(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64, h
             );
         }
     }
-    let zero = to_v(0.0f64.clamp(min, max));
+    let zero = to_v(0.0f64.max(min).min(max));
     if let Some(bk) = bar_kind {
         let bars: Vec<(usize, &deckcraft_model::chart::Series)> =
             c.series.iter().enumerate().filter(|(_, s)| c.series_kind(s).is_bar_like()).collect();
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..64e44670 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1711,3 +1711,51 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
     let (w, h) = ink(deckcraft_model::text::TextDir::Vertical);
     assert!(h > w * 3, "vert: stroke on its side {w}x{h}");
 }
+
+#[test]
+fn charts_in_degenerate_frames_draw_without_panicking() {
+    // A chart frame squashed to no width (cx="0" in a generated file) made the value labels'
+    // gutter clamp panic (its upper bound, a share of the width, fell below its lower bound).
+    // Every chart type and legend position must survive any frame size.
+    let p = Presentation::default();
+    let rctx = Ctx::for_slide(&p, &p.slides[0]).unwrap();
+    let kinds = [
+        ChartType::Column,
+        ChartType::StackedColumn,
+        ChartType::PercentColumn,
+        ChartType::Bar,
+        ChartType::StackedBar,
+        ChartType::PercentBar,
+        ChartType::Line,
+        ChartType::LineMarkers,
+        ChartType::StackedLine,
+        ChartType::Area,
+        ChartType::StackedArea,
+        ChartType::Pie,
+        ChartType::Doughnut,
+        ChartType::Scatter,
+        ChartType::Bubble,
+        ChartType::Radar,
+        ChartType::FilledRadar,
+        ChartType::Stock,
+        ChartType::Surface,
+        ChartType::Histogram,
+        ChartType::Pareto,
+        ChartType::BoxWhisker,
+        ChartType::Waterfall,
+        ChartType::Funnel,
+        ChartType::Treemap,
+        ChartType::Sunburst,
+        ChartType::Combo,
+    ];
+    let mut ctx = vello_cpu::RenderContext::new(64, 64);
+    for k in kinds {
+        for (w, h) in [(0.0, 403.0), (403.0, 0.0), (0.0, 0.0), (2.0, 400.0), (400.0, 2.0), (12.0, 12.0)] {
+            for legend in [None, Some("b"), Some("t"), Some("r"), Some("l"), Some("tr")] {
+                let mut c = Chart::sample(k);
+                c.legend = legend.map(String::from);
+                crate::chart::draw(&mut ctx, &rctx, &c, kurbo::Affine::IDENTITY, w, h);
+            }
+        }
+    }
+}

From 1e6292306ae0d965084b50fa63029d4ef747f10a Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:08:40 +0300
Subject: [PATCH 290/376] UI: Format Background picture fill sets transparency
 and tiling

A picture background can set transparency, tile, offset, scale,
alignment and mirror. A solid fill can set transparency. Apply to All
copies the current slide's background, including a picture, onto every
slide. Unchanged options are not an undo step.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                             |   4 +-
 crates/engine/src/cmd/design.rs        | 333 ++++++++++++++++++++++---
 crates/ui-egui/src/background_tests.rs |  75 ++++++
 crates/ui-egui/src/panes.rs            | 104 +++++++-
 docs/gaps.md                           |   7 +-
 docs/target-app-parity.md              |   7 +-
 docs/ui-parity.md                      |   7 +-
 7 files changed, 494 insertions(+), 43 deletions(-)
 create mode 100644 crates/ui-egui/src/background_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..d0eaaaec 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Format Background picture options; percentages unchanged) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Format Background: a solid fill's transparency, and for a picture transparency, tile, offset, scale, alignment and mirror. Apply to All copies a picture background onto every slide. The same `design.background` command; dialogs stay 27 |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Format Background picture and solid options |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..0e7b5cf2 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -23,7 +23,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Format Background",
             ["Design", "Customize"],
             None,
-            "{color? | gradient? | picture?: base64 | style?: 1..12 | reset?, all?: bool (apply to all), index?}",
+            "{color? | gradient? | picture?: base64 | pattern? | style?: 1..12 | reset?, all?: bool, index?, transparency?: 0..1, pictureProps?: {tile?, offsetX?, offsetY?: pt, scaleX?, scaleY?: 0.01..10, align?, mirror?, stretch?: [l,t,r,b], rotateWithShape?}, copy?: bool}",
             has_slide,
             background
         ),
@@ -149,65 +149,249 @@ fn fonts(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 fn background(s: &mut Session, p: &Value) -> Result<Value> {
-    let bg: Option<Background> = if bool_or(p, "reset", false) {
-        None
-    } else if let Some(c) = color_param(p, "color") {
-        Some(Background::Fill { fill: Fill::solid(c) })
-    } else if let Some(i) = usize_param(p, "style") {
+    if bool_or(p, "copy", false) {
+        return copy_slide_background(s);
+    }
+    let props = p.get("pictureProps").filter(|v| v.is_object()).cloned();
+    let transparency = f64_param(p, "transparency");
+    let reset = bool_or(p, "reset", false);
+    let color = color_param(p, "color");
+    let style = usize_param(p, "style");
+    let op = if reset {
+        BgOp::Set(None)
+    } else if let Some(mut c) = color {
+        if let Some(t) = transparency {
+            set_solid_transparency(&mut c, t);
+        }
+        BgOp::Set(Some(Background::Fill { fill: Fill::solid(c) }))
+    } else if let Some(i) = style {
         // Background styles: 3 theme bg fills × 4 colours (bg1, bg2, tx1, tx2).
         let slots =
             [deckcraft_color::SchemeSlot::Bg1, deckcraft_color::SchemeSlot::Bg2, deckcraft_color::SchemeSlot::Tx2, deckcraft_color::SchemeSlot::Tx1];
         let i = i.clamp(1, 12) - 1;
-        Some(Background::Ref {
+        BgOp::Set(Some(Background::Ref {
             idx: 1001 + (i / 4) as u32,
             color: deckcraft_model::ColorRef::scheme(slots.get(i % 4).copied().unwrap_or(deckcraft_color::SchemeSlot::Bg1)),
-        })
+        }))
     } else if let Some(g) = p.get("gradient") {
         let mut g = super::shape::gradient_param(g).ok_or_else(|| bad("design.background", "gradient needs two or more `stops`"))?;
         g.rotate_with_shape = false;
-        Some(Background::Fill { fill: Fill::Gradient(g) })
+        BgOp::Set(Some(Background::Fill { fill: Fill::Gradient(g) }))
     } else if let Some(pt) = p.get("pattern") {
-        Some(Background::Fill {
+        BgOp::Set(Some(Background::Fill {
             fill: Fill::Pattern(deckcraft_model::style::PatternFill {
                 preset: pt.get("preset").and_then(Value::as_str).unwrap_or("pct50").to_string(),
                 fg: pt.get("fg").and_then(color_value).unwrap_or(deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Accent1)),
                 bg: pt.get("bg").and_then(color_value).unwrap_or(deckcraft_model::ColorRef::scheme(deckcraft_color::SchemeSlot::Bg1)),
             }),
-        })
+        }))
     } else if p.get("picture").is_some() {
         let (name, bytes) = super::insert::media_bytes(&with_param(p, "data", p.get("picture").cloned().unwrap_or_default()), "design.background")?;
         let ct = super::insert::content_type(&name, &bytes);
         let media = s.edit(|doc, _| Ok(doc.add_media(&name, ct, bytes)))?;
-        Some(Background::Fill { fill: Fill::Picture(deckcraft_model::style::PictureFill { media, ..Default::default() }) })
+        let mut pf = deckcraft_model::style::PictureFill { media, ..Default::default() };
+        if let Some(pp) = &props {
+            apply_picture_props(&mut pf, pp);
+        }
+        if let Some(t) = transparency {
+            set_picture_transparency(&mut pf, t);
+        }
+        BgOp::Set(Some(Background::Fill { fill: Fill::Picture(pf) }))
+    } else if props.is_some() || transparency.is_some() {
+        BgOp::Adjust
     } else {
-        return Err(bad("design.background", "give `color`, `gradient`, `pattern`, `picture`, `style` or `reset`"));
+        return Err(bad(
+            "design.background",
+            "give `color`, `gradient`, `pattern`, `picture`, `style`, `reset`, `pictureProps`, `transparency` or `copy`",
+        ));
     };
     let all = bool_or(p, "all", false);
     let index = usize_param(p, "index");
+    if matches!(op, BgOp::Adjust) {
+        let next = {
+            let st = s.doc()?;
+            let current = background_of(&st.doc, &st.selection, index);
+            let picture = matches!(current, Some(Background::Fill { fill: Fill::Picture(_) }));
+            let solid = matches!(current, Some(Background::Fill { fill: Fill::Solid { .. } }));
+            if props.is_some() && !picture {
+                return Err(bad("design.background", "picture options need a picture background"));
+            }
+            if transparency.is_some() && !picture && !solid {
+                return Err(bad("design.background", "transparency needs a solid or picture background"));
+            }
+            let mut next = current.clone();
+            if let Some(bg) = next.as_mut() {
+                adjust_background(bg, props.as_ref(), transparency);
+            }
+            if next == current { None } else { Some(next) }
+        };
+        let Some(next) = next else { return ok() };
+        s.edit(|doc, sel| {
+            write_background(doc, sel, index, false, next);
+            Ok(())
+        })?;
+        return ok();
+    }
+    let BgOp::Set(bg) = op else { return ok() };
+    let unchanged = {
+        let st = s.doc()?;
+        backgrounds_already(&st.doc, &st.selection, index, all, &bg)
+    };
+    if unchanged {
+        return ok();
+    }
     s.edit(|doc, sel| {
-        match sel.target {
-            Target::Master { master } => {
-                if let Some(m) = doc.masters.get_mut(master) {
-                    Arc::make_mut(m).background = bg.clone();
+        write_background(doc, sel, index, all, bg);
+        Ok(())
+    })?;
+    ok()
+}
+
+enum BgOp {
+    Set(Option<Background>),
+    Adjust,
+}
+
+fn background_of(doc: &Presentation, sel: &crate::Selection, index: Option<usize>) -> Option<Background> {
+    match sel.target {
+        Target::Master { master } => doc.masters.get(master).and_then(|m| m.background.clone()),
+        Target::Layout { master, layout } => doc.masters.get(master).and_then(|m| m.layouts.get(layout)).and_then(|l| l.background.clone()),
+        Target::Slides => doc.slides.get(index.unwrap_or(sel.slide)).and_then(|sl| sl.background.clone()),
+    }
+}
+
+fn backgrounds_already(doc: &Presentation, sel: &crate::Selection, index: Option<usize>, all: bool, bg: &Option<Background>) -> bool {
+    match sel.target {
+        Target::Master { master } => doc.masters.get(master).is_some_and(|m| m.background == *bg),
+        Target::Layout { master, layout } => doc.masters.get(master).and_then(|m| m.layouts.get(layout)).is_some_and(|l| l.background == *bg),
+        Target::Slides => {
+            let list: Vec<usize> = if all { (0..doc.slides.len()).collect() } else { vec![index.unwrap_or(sel.slide)] };
+            !list.is_empty() && list.iter().all(|i| doc.slides.get(*i).is_some_and(|sl| sl.background == *bg))
+        }
+    }
+}
+
+fn write_background(doc: &mut Presentation, sel: &crate::Selection, index: Option<usize>, all: bool, bg: Option<Background>) {
+    match sel.target {
+        Target::Master { master } => {
+            if let Some(m) = doc.masters.get_mut(master) {
+                Arc::make_mut(m).background = bg;
+            }
+        }
+        Target::Layout { master, layout } => {
+            if let Some(l) = doc.masters.get_mut(master).and_then(|m| Arc::make_mut(m).layouts.get_mut(layout)) {
+                l.background = bg;
+            }
+        }
+        Target::Slides => {
+            let list: Vec<usize> = if all { (0..doc.slides.len()).collect() } else { vec![index.unwrap_or(sel.slide)] };
+            for i in list {
+                if let Some(sl) = doc.slides.get_mut(i) {
+                    Arc::make_mut(sl).background = bg.clone();
                 }
             }
-            Target::Layout { master, layout } => {
-                if let Some(l) = doc.masters.get_mut(master).and_then(|m| Arc::make_mut(m).layouts.get_mut(layout)) {
-                    l.background = bg.clone();
-                }
+        }
+    }
+}
+
+fn copy_slide_background(s: &mut Session) -> Result<Value> {
+    let bg = {
+        let st = s.doc()?;
+        if !matches!(st.selection.target, Target::Slides) {
+            return Err(bad("design.background", "copy applies to slides"));
+        }
+        let bg = st.doc.slides.get(st.selection.slide).and_then(|sl| sl.background.clone());
+        if st.doc.slides.iter().all(|sl| sl.background == bg) {
+            return ok();
+        }
+        bg
+    };
+    s.edit(|doc, sel| {
+        write_background(doc, sel, None, true, bg);
+        Ok(())
+    })?;
+    ok()
+}
+
+fn adjust_background(bg: &mut Background, props: Option<&Value>, transparency: Option<f64>) {
+    match bg {
+        Background::Fill { fill: Fill::Picture(pf) } => {
+            if let Some(pp) = props {
+                apply_picture_props(pf, pp);
             }
-            Target::Slides => {
-                let list: Vec<usize> = if all { (0..doc.slides.len()).collect() } else { vec![index.unwrap_or(sel.slide)] };
-                for i in list {
-                    if let Some(sl) = doc.slides.get_mut(i) {
-                        Arc::make_mut(sl).background = bg.clone();
+            if let Some(t) = transparency {
+                set_picture_transparency(pf, t);
+            }
+        }
+        Background::Fill { fill: Fill::Solid { color } } => {
+            if let Some(t) = transparency {
+                set_solid_transparency(color, t);
+            }
+        }
+        _ => {}
+    }
+}
+
+fn set_picture_transparency(pf: &mut deckcraft_model::style::PictureFill, t: f64) {
+    let a = 1.0 - t.clamp(0.0, 1.0);
+    pf.alpha = (a < 1.0).then_some(a);
+}
+
+fn set_solid_transparency(color: &mut deckcraft_model::ColorRef, t: f64) {
+    color.mods.retain(|m| !matches!(m, deckcraft_color::ColorTransform::Alpha(_)));
+    let t = t.clamp(0.0, 1.0);
+    if t > 0.0 {
+        color.mods.push(deckcraft_color::ColorTransform::Alpha(((1.0 - t) * 100_000.0).round() as i32));
+    }
+}
+
+/// Picture-fill options for Format Background (tile, offsets, scale, alignment, mirror, stretch).
+fn apply_picture_props(pf: &mut deckcraft_model::style::PictureFill, pp: &Value) {
+    use deckcraft_model::style::PictureMode;
+    let f = |k: &str| pp.get(k).and_then(Value::as_f64).filter(|v| v.is_finite());
+    if let Some(up) = pp.get("rotateWithShape").and_then(Value::as_bool) {
+        pf.upright = !up;
+    }
+    match pp.get("tile").and_then(Value::as_bool) {
+        Some(true) if !matches!(pf.mode, PictureMode::Tile { .. }) => {
+            pf.mode = PictureMode::Tile { tx: 0.0, ty: 0.0, sx: 1.0, sy: 1.0, flip: "none".into(), align: "tl".into() };
+        }
+        Some(false) if !matches!(pf.mode, PictureMode::Stretch { .. }) => pf.mode = PictureMode::default(),
+        _ => {}
+    }
+    match &mut pf.mode {
+        PictureMode::Tile { tx, ty, sx, sy, flip, align } => {
+            if let Some(v) = f("offsetX") {
+                *tx = v.clamp(-4000.0, 4000.0);
+            }
+            if let Some(v) = f("offsetY") {
+                *ty = v.clamp(-4000.0, 4000.0);
+            }
+            if let Some(v) = f("scaleX") {
+                *sx = v.clamp(0.01, 10.0);
+            }
+            if let Some(v) = f("scaleY") {
+                *sy = v.clamp(0.01, 10.0);
+            }
+            if let Some(m) = pp.get("mirror").and_then(Value::as_str).filter(|m| matches!(*m, "none" | "x" | "y" | "xy")) {
+                *flip = m.to_string();
+            }
+            if let Some(a) =
+                pp.get("align").and_then(Value::as_str).filter(|a| matches!(*a, "tl" | "t" | "tr" | "l" | "ctr" | "r" | "bl" | "b" | "br"))
+            {
+                *align = a.to_string();
+            }
+        }
+        PictureMode::Stretch { fill_rect } => {
+            if let Some(arr) = pp.get("stretch").and_then(Value::as_array) {
+                for (slot, v) in fill_rect.iter_mut().zip(arr) {
+                    if let Some(v) = v.as_f64().filter(|v| v.is_finite()) {
+                        *slot = v.clamp(-10.0, 0.99);
                     }
                 }
             }
         }
-        Ok(())
-    })?;
-    ok()
+    }
 }
 
 fn hide_bg_graphics(s: &mut Session, p: &Value) -> Result<Value> {
@@ -558,9 +742,100 @@ fn insert_placeholder(s: &mut Session, p: &Value) -> Result<Value> {
 
 #[cfg(test)]
 mod tests {
+    use deckcraft_model::style::PictureMode;
+    use deckcraft_model::{Background, Fill};
+    use serde_json::json;
+
+    use crate::Session;
+
+    fn png() -> String {
+        let mut img = image::RgbaImage::new(2, 2);
+        img.put_pixel(0, 0, image::Rgba([10, 20, 30, 255]));
+        let mut bytes = Vec::new();
+        image::DynamicImage::ImageRgba8(img).write_to(&mut std::io::Cursor::new(&mut bytes), image::ImageFormat::Png).unwrap();
+        crate::cmd::base64_encode(&bytes)
+    }
+
+    fn picture(s: &Session) -> deckcraft_model::style::PictureFill {
+        match &s.doc().unwrap().doc.slides[0].background {
+            Some(Background::Fill { fill: Fill::Picture(pf) }) => pf.clone(),
+            other => panic!("expected a picture background, got {other:?}"),
+        }
+    }
+
+    fn undo_len(s: &Session) -> usize {
+        s.doc().unwrap().history.undo.len()
+    }
+
     #[test]
     fn civil_dates() {
         assert_eq!(super::civil(0), (1970, 1, 1));
         assert_eq!(super::civil(20_734), (2026, 10, 8));
     }
+
+    #[test]
+    fn background_picture_options_tile_transparency_and_copy() {
+        let mut s = Session::with_new();
+        let n = undo_len(&s);
+        let err = s.execute("design.background", &json!({"pictureProps": {"tile": true}})).unwrap_err().to_string();
+        assert!(err.contains("picture background"), "{err}");
+        assert!(s.execute("design.background", &json!({"transparency": 0.2})).is_err());
+        assert_eq!(undo_len(&s), n);
+
+        s.execute("design.background", &json!({"color": "accent1", "transparency": 0.25})).unwrap();
+        match &s.doc().unwrap().doc.slides[0].background {
+            Some(Background::Fill { fill: Fill::Solid { color } }) => assert!((color.alpha() - 0.75).abs() < 1e-4, "{}", color.alpha()),
+            other => panic!("expected a solid background, got {other:?}"),
+        }
+        let n = undo_len(&s);
+        s.execute("design.background", &json!({"transparency": 0.25})).unwrap();
+        assert_eq!(undo_len(&s), n, "the same transparency is not an undo step");
+
+        s.execute("design.background", &json!({"picture": png(), "name": "dot.png", "transparency": 0.4, "pictureProps": {"tile": true}})).unwrap();
+        let pf = picture(&s);
+        assert!((pf.alpha.unwrap_or(1.0) - 0.6).abs() < 1e-6);
+        assert!(matches!(pf.mode, PictureMode::Tile { .. }));
+        let n = undo_len(&s);
+
+        s.execute(
+            "design.background",
+            &json!({"pictureProps": {"offsetX": 12.0, "offsetY": -3.0, "scaleX": 0.5, "scaleY": 50.0, "align": "ctr", "mirror": "xy", "rotateWithShape": false}}),
+        )
+        .unwrap();
+        match picture(&s).mode {
+            PictureMode::Tile { tx, ty, sx, sy, flip, align } => {
+                assert_eq!((tx, ty, sx, sy), (12.0, -3.0, 0.5, 10.0));
+                assert_eq!(flip, "xy");
+                assert_eq!(align, "ctr");
+            }
+            other => panic!("expected a tile, got {other:?}"),
+        }
+        assert!(picture(&s).upright);
+        s.execute("design.background", &json!({"pictureProps": {"align": "bogus", "offsetX": "nope"}})).unwrap();
+        match picture(&s).mode {
+            PictureMode::Tile { tx, align, .. } => {
+                assert_eq!(tx, 12.0);
+                assert_eq!(align, "ctr");
+            }
+            other => panic!("expected the tile to stay, got {other:?}"),
+        }
+        assert_eq!(undo_len(&s), n + 1, "ignored options are not an undo step");
+
+        s.execute("design.background", &json!({"pictureProps": {"tile": false, "stretch": [0.1, 0.2, 0.0, 0.0]}})).unwrap();
+        match picture(&s).mode {
+            PictureMode::Stretch { fill_rect } => assert_eq!(fill_rect, [0.1, 0.2, 0.0, 0.0]),
+            other => panic!("expected a stretch, got {other:?}"),
+        }
+
+        s.execute("slide.new", &json!({})).unwrap();
+        assert!(s.doc().unwrap().doc.slides[1].background.is_none());
+        s.execute("slide.go", &json!({"index": 0})).unwrap();
+        let n = undo_len(&s);
+        s.execute("design.background", &json!({"copy": true})).unwrap();
+        assert_eq!(s.doc().unwrap().doc.slides[1].background, s.doc().unwrap().doc.slides[0].background);
+        assert_eq!(undo_len(&s), n + 1);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Format Background");
+        s.execute("design.background", &json!({"copy": true})).unwrap();
+        assert_eq!(undo_len(&s), n + 1, "copying an already shared background is not an undo step");
+    }
 }
diff --git a/crates/ui-egui/src/background_tests.rs b/crates/ui-egui/src/background_tests.rs
new file mode 100644
index 00000000..b2a7a879
--- /dev/null
+++ b/crates/ui-egui/src/background_tests.rs
@@ -0,0 +1,75 @@
+//! Format Background pane: picture transparency, tiling, and Apply to All.
+
+use deckcraft_engine::Session;
+use deckcraft_model::style::PictureMode;
+use deckcraft_model::{Background, Fill};
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+/// 1×1 PNG.
+const PNG: &str = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg==";
+
+fn harness(mut app: SlideApp) -> Harness<'static, SlideApp> {
+    app.ui.tab = "Design".into();
+    app.ui.pane = Some("background".into());
+    let mut h = Harness::builder().with_size(egui::vec2(1800.0, 1100.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn picture_mode(h: &Harness<'_, SlideApp>) -> PictureMode {
+    match &h.state().session.active().unwrap().doc.slides[0].background {
+        Some(Background::Fill { fill: Fill::Picture(pf) }) => pf.mode.clone(),
+        other => panic!("expected a picture background, got {other:?}"),
+    }
+}
+
+#[test]
+fn picture_fill_shows_transparency_and_tiling() {
+    let mut s = Session::with_new();
+    s.execute("design.background", &json!({"picture": PNG, "name": "dot.png"})).unwrap();
+    let mut h = harness(SlideApp::new(s, Services::default()));
+    let _ = h.get_by_label("Format Background");
+    let _ = h.get_by_label("Picture or texture fill");
+    assert!(h.query_all_by_label("Transparency").next().is_some());
+    h.get_by_label("Tile picture as texture").click();
+    h.run_steps(2);
+    let _ = h.get_by_label("Offset X");
+    let _ = h.get_by_label("Scale X");
+    let _ = h.get_by_label("Alignment");
+    let _ = h.get_by_label("Mirror");
+    assert!(matches!(picture_mode(&h), PictureMode::Tile { .. }));
+}
+
+#[test]
+fn solid_fill_shows_transparency_without_tile_options() {
+    let mut s = Session::with_new();
+    s.execute("design.background", &json!({"color": "accent1"})).unwrap();
+    let h = harness(SlideApp::new(s, Services::default()));
+    assert!(h.query_all_by_label("Transparency").next().is_some());
+    let _ = h.get_by_label("Solid fill");
+    assert!(h.query_by_label("Tile picture as texture").is_none());
+}
+
+#[test]
+fn apply_to_all_copies_the_picture() {
+    let mut s = Session::with_new();
+    s.execute("design.background", &json!({"picture": PNG, "name": "dot.png"})).unwrap();
+    s.execute("slide.new", &json!({})).unwrap();
+    s.execute("slide.go", &json!({"index": 0})).unwrap();
+    let mut h = harness(SlideApp::new(s, Services::default()));
+    h.get_by_label("Apply to All").click();
+    h.run_steps(2);
+    let doc = &h.state().session.active().unwrap().doc;
+    assert!(matches!(doc.slides[1].background, Some(Background::Fill { fill: Fill::Picture(_) })));
+    assert_eq!(doc.slides[1].background, doc.slides[0].background);
+}
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..e4b88d5d 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -397,6 +397,10 @@ fn background(app: &mut SlideApp, ui: &mut Ui) {
                     }
                 });
             });
+            let mut tr = ((1.0 - color.alpha()) * 100.0) as f32;
+            if ui.add(egui::Slider::new(&mut tr, 0.0..=100.0).text("Transparency").suffix("%")).drag_stopped() {
+                run(app, "design.background", json!({"transparency": (f64::from(tr) / 100.0).clamp(0.0, 1.0)}));
+            }
         }
         Some(Fill::Gradient(g)) => {
             current = Some(json!({"gradient": crate::fillui::gradient_json(g)}));
@@ -426,7 +430,7 @@ fn background(app: &mut SlideApp, ui: &mut Ui) {
                 });
             }
         }
-        Some(Fill::Picture(_)) => {
+        Some(Fill::Picture(pf)) => {
             if ui.button("Insert picture from file…").clicked()
                 && let Some(pick) = app.services.pick_open.as_mut()
                 && let Some(path) = pick("picture")
@@ -434,6 +438,7 @@ fn background(app: &mut SlideApp, ui: &mut Ui) {
             {
                 let _ = app.run("design.background", json!({"picture": deckcraft_engine::cmd::base64_encode(&bytes)}));
             }
+            picture_background_options(app, ui, pf);
         }
         _ => {}
     }
@@ -444,12 +449,15 @@ fn background(app: &mut SlideApp, ui: &mut Ui) {
         run(app, "design.hideBackgroundGraphics", json!({"hide": h}));
     }
     ui.add_space(8.0);
+    let picture = matches!(fill, Some(Fill::Picture(_)));
     ui.horizontal(|ui| {
-        if ui.add_enabled(current.is_some(), egui::Button::new("Apply to All")).clicked()
-            && let Some(Value::Object(mut o)) = current.clone()
-        {
-            o.insert("all".into(), json!(true));
-            run(app, "design.background", Value::Object(o));
+        if ui.add_enabled(current.is_some() || picture, egui::Button::new("Apply to All")).clicked() {
+            if let Some(Value::Object(mut o)) = current.clone() {
+                o.insert("all".into(), json!(true));
+                run(app, "design.background", Value::Object(o));
+            } else if picture {
+                run(app, "design.background", json!({"copy": true}));
+            }
         }
         if ui.button("Reset Background").clicked() {
             run(app, "design.background", json!({"reset": true}));
@@ -457,6 +465,86 @@ fn background(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+fn picture_background_options(app: &mut SlideApp, ui: &mut Ui, pf: &deckcraft_model::style::PictureFill) {
+    use deckcraft_model::style::PictureMode;
+    let alpha = pf.alpha.unwrap_or(1.0);
+    let mut tr = ((1.0 - alpha) * 100.0) as f32;
+    if ui.add(egui::Slider::new(&mut tr, 0.0..=100.0).text("Transparency").suffix("%")).drag_stopped() {
+        run(app, "design.background", json!({"transparency": (f64::from(tr) / 100.0).clamp(0.0, 1.0)}));
+    }
+    let mut tile = matches!(pf.mode, PictureMode::Tile { .. });
+    if ui.checkbox(&mut tile, "Tile picture as texture").changed() {
+        run(app, "design.background", json!({"pictureProps": {"tile": tile}}));
+    }
+    let PictureMode::Tile { tx, ty, sx, sy, flip, align } = &pf.mode else { return };
+    for (label, id, value, suffix, scale) in [
+        ("Offset X", "bg-ox", *tx, " pt", 1.0),
+        ("Offset Y", "bg-oy", *ty, " pt", 1.0),
+        ("Scale X", "bg-sx", *sx * 100.0, "%", 0.01),
+        ("Scale Y", "bg-sy", *sy * 100.0, "%", 0.01),
+    ] {
+        ui.horizontal(|ui| {
+            ui.add_sized(vec2(72.0, 20.0), egui::Label::new(label));
+            if let Some(v) = widgets::spinner(ui, id, value, if scale < 1.0 { 5.0 } else { 1.0 }, suffix, 64.0) {
+                let key = match id {
+                    "bg-ox" => "offsetX",
+                    "bg-oy" => "offsetY",
+                    "bg-sx" => "scaleX",
+                    _ => "scaleY",
+                };
+                run(app, "design.background", json!({"pictureProps": {key: v * scale}}));
+            }
+        });
+    }
+    let align_name = match align.as_str() {
+        "t" => "Top",
+        "tr" => "Top Right",
+        "l" => "Left",
+        "ctr" => "Center",
+        "r" => "Right",
+        "bl" => "Bottom Left",
+        "b" => "Bottom",
+        "br" => "Bottom Right",
+        _ => "Top Left",
+    };
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(72.0, 20.0), egui::Label::new("Alignment"));
+        egui::ComboBox::from_id_salt("bg-align").selected_text(align_name).width(140.0).show_ui(ui, |ui| {
+            for (k, l) in [
+                ("tl", "Top Left"),
+                ("t", "Top"),
+                ("tr", "Top Right"),
+                ("l", "Left"),
+                ("ctr", "Center"),
+                ("r", "Right"),
+                ("bl", "Bottom Left"),
+                ("b", "Bottom"),
+                ("br", "Bottom Right"),
+            ] {
+                if ui.selectable_label(align == k, l).clicked() {
+                    run(app, "design.background", json!({"pictureProps": {"align": k}}));
+                }
+            }
+        });
+    });
+    let mirror_name = match flip.as_str() {
+        "x" => "Horizontal",
+        "y" => "Vertical",
+        "xy" => "Both",
+        _ => "None",
+    };
+    ui.horizontal(|ui| {
+        ui.add_sized(vec2(72.0, 20.0), egui::Label::new("Mirror"));
+        egui::ComboBox::from_id_salt("bg-mirror").selected_text(mirror_name).width(140.0).show_ui(ui, |ui| {
+            for (k, l) in [("none", "None"), ("x", "Horizontal"), ("y", "Vertical"), ("xy", "Both")] {
+                if ui.selectable_label(flip == k, l).clicked() {
+                    run(app, "design.background", json!({"pictureProps": {"mirror": k}}));
+                }
+            }
+        });
+    });
+}
+
 fn animation(app: &mut SlideApp, ui: &mut Ui) {
     let t = Tokens::get(ui.ctx());
     let Some(st) = app.session.active() else { return };
@@ -635,3 +723,7 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
         ui.add_space(8.0);
     }
 }
+
+#[cfg(test)]
+#[path = "background_tests.rs"]
+mod background_tests;
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..fb6675c8 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture options are pane controls, not a new dialog; dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -204,7 +204,9 @@ Detail in [ui-parity.md](ui-parity.md).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
 - **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
+  Replace Fonts, Action Settings, Print, Insert Object…). Format Background picture options
+  (transparency, tile, offset, scale, alignment, mirror, and Apply to All copying a picture) are
+  pane controls on `design.background`, not another dialog. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
@@ -256,6 +258,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Format Background picture and solid options are in the existing pane. Dialogs stay 27 |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..1940b7e0 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; percentages unchanged; previous: hours to ~95% per audience, ready ~55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -211,7 +211,9 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   inheritance (slide → layout → master → theme), sections, notes, comments, custom shows,
   header/footer fields, embedded media, unlimited undo on shared slide snapshots.
 - **Themes:** 8 original themes with colour and font schemes, custom colours and fonts,
-  backgrounds (solid, gradient, picture, pattern), slide size presets.
+  backgrounds (solid, gradient, picture, pattern; a solid fill's transparency; picture
+  transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture),
+  slide size presets.
 - **Shapes:** ~180 preset geometries with adjustment handles, text boxes, pictures (crop,
   corrections, animated GIFs that play and pause), tables with styles, charts (column, bar, line,
   area, pie, doughnut, scatter and more), basic SmartArt, groups, connectors glued to sites,
@@ -276,6 +278,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Format Background picture and solid options noted under what works today. Percentages, the 226-command count and the d556ff9 dialog snapshot stay as they are |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..7d10b47b 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,8 +1,8 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -59,7 +59,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Pane / dialog | PowerPoint | DeckCraft |
 |---|---|---|
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
-| Format Background pane | yes | yes |
+| Format Background pane | yes | yes: solid transparency; picture transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture. Stretch insets and rotate-with-shape are command parameters |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Format Background pane: solid transparency, picture transparency, tile, offset, scale, alignment, mirror, and Apply to All copying a picture. Not a new dialog; the dialog count stays 27 |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From d6b9cc9b5e1399cb79d15a4c61d361985482bc4d Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:13:10 +0300
Subject: [PATCH 291/376] Outline: lay out only the slides in view

Outline view built every slide's title and text editors each frame, so a 2000-slide deck took
about 40 ms a frame in a release build (more with real text). Slides outside the view (with a
margin) now take their last measured height, estimated from their line count until first
shown; the current slide is always laid out so its editor keeps the focus.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/ui-egui/src/huge_deck_tests.rs |  39 ++++++++
 crates/ui-egui/src/lib.rs             |   2 +
 crates/ui-egui/src/sorter.rs          | 139 +++++++++++++++-----------
 3 files changed, 123 insertions(+), 57 deletions(-)
 create mode 100644 crates/ui-egui/src/huge_deck_tests.rs

diff --git a/crates/ui-egui/src/huge_deck_tests.rs b/crates/ui-egui/src/huge_deck_tests.rs
new file mode 100644
index 00000000..b22cb400
--- /dev/null
+++ b/crates/ui-egui/src/huge_deck_tests.rs
@@ -0,0 +1,39 @@
+//! Large presentations in the editor: views that list every slide lay out only what is in view.
+#![allow(clippy::unwrap_used, clippy::expect_used)]
+
+use egui::accesskit::Role;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+use deckcraft_engine::Session;
+
+fn harness(n: usize) -> egui_kittest::Harness<'static, SlideApp> {
+    let mut s = Session::with_new();
+    for _ in 1..n {
+        s.execute("slide.new", &json!({})).unwrap();
+    }
+    egui_kittest::Harness::builder().with_size(egui::vec2(1400.0, 900.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SlideApp::new(s, Services::default()),
+    )
+}
+
+/// Outline view of 2000 slides lays out the slides in view (and the current one), not all 2000
+/// title editors every frame (40 ms a frame in a release build, growing with the text).
+#[test]
+fn the_outline_of_a_huge_deck_lays_out_only_what_is_in_view() {
+    let mut h = harness(2000);
+    h.state_mut().run("view.outline", json!({})).unwrap();
+    h.run_steps(3);
+    let editors = h.query_all_by_role(Role::TextInput).count();
+    assert!(editors > 5 && editors < 200, "{editors} text editors laid out");
+    // The current slide is always laid out, wherever it is.
+    h.state_mut().run("slide.go", json!({"index": 1500})).unwrap();
+    h.run_steps(3);
+    assert!(h.query_all_by_role(Role::TextInput).count() < 200);
+    assert_eq!(h.state().session.doc().unwrap().selection.slide, 1500);
+}
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..59636e29 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1127,6 +1127,8 @@ fn js_now() -> f64 {
     js_sys::Date::now()
 }
 
+#[cfg(test)]
+mod huge_deck_tests;
 #[cfg(test)]
 mod ime_tests;
 
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index dd26dd85..6d3a3ab3 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -166,67 +166,92 @@ pub fn outline_pane(app: &mut SlideApp, ui: &mut Ui) {
             let Some(st) = app.session.active() else { return };
             let doc = st.doc.clone();
             let cur = st.selection.slide;
-            egui::ScrollArea::vertical().auto_shrink([false, false]).show(ui, |ui| {
+            // Only the slides in view (and the current one, whose editor may have the focus) are
+            // laid out; the rest take their last measured height (estimated until first shown).
+            // Laying out every slide's editors each frame made a 2000-slide outline crawl.
+            egui::ScrollArea::vertical().auto_shrink([false, false]).show_viewport(ui, |ui, viewport| {
+                let origin = ui.cursor().top();
+                let margin = 300.0;
                 for (i, s) in doc.slides.iter().enumerate() {
-                    let title_shape = s.shapes.iter().find(|x| x.ph_type().is_some_and(|k| k.is_title())).map(|x| x.id.0);
-                    ui.horizontal(|ui| {
-                        ui.label(egui::RichText::new(format!("{}", i + 1)).color(t.text_dim));
-                        let (r, _) = ui.allocate_exact_size(vec2(14.0, 10.0), Sense::hover());
-                        ui.painter().rect_stroke(
-                            r,
-                            CornerRadius::same(1),
-                            Stroke::new(1.0, if i == cur { t.accent } else { t.text_dim }),
-                            egui::StrokeKind::Inside,
-                        );
-                        let id = egui::Id::new(("ol-title", s.id.0));
-                        let cur_title = s.title();
-                        let mut v: String = ui.data_mut(|d| d.get_temp(id).unwrap_or_else(|| cur_title.clone()));
-                        let resp =
-                            ui.add(egui::TextEdit::singleline(&mut v).font(theme::bold(14.0)).frame(egui::Frame::NONE).desired_width(f32::INFINITY));
-                        if resp.gained_focus() {
-                            let _ = app.run("slide.go", json!({"index": i}));
-                        }
-                        if resp.lost_focus()
-                            && v != cur_title
-                            && let Some(tid) = title_shape
-                        {
-                            let _ = app.run("text.set", json!({"id": tid, "text": v}));
-                        }
-                        if !resp.has_focus() {
-                            ui.data_mut(|d| d.remove::<String>(id));
-                        } else {
-                            ui.data_mut(|d| d.insert_temp(id, v));
-                        }
-                    });
-                    for sh in s.shapes.iter().filter(|x| !x.ph_type().is_some_and(|k| k.is_title())) {
-                        let Some(tb) = &sh.text else { continue };
-                        if tb.is_empty() {
-                            continue;
-                        }
-                        let id = egui::Id::new(("ol-body", s.id.0, sh.id.0));
-                        let cur_text: String =
-                            tb.paragraphs.iter().map(|p| format!("{}{}", "\t".repeat(p.level as usize), p.text())).collect::<Vec<_>>().join("\n");
-                        let mut v: String = ui.data_mut(|d| d.get_temp(id).unwrap_or_else(|| cur_text.clone()));
-                        ui.horizontal(|ui| {
-                            ui.add_space(36.0);
-                            let resp =
-                                ui.add(egui::TextEdit::multiline(&mut v).frame(egui::Frame::NONE).desired_width(f32::INFINITY).desired_rows(1));
-                            if resp.gained_focus() {
-                                let _ = app.run("slide.go", json!({"index": i}));
-                            }
-                            if resp.lost_focus() && v != cur_text {
-                                let _ = app.run("text.set", json!({"id": sh.id.0, "text": v}));
-                            }
-                            if !resp.has_focus() {
-                                ui.data_mut(|d| d.remove::<String>(id));
-                            } else {
-                                ui.data_mut(|d| d.insert_temp(id, v.clone()));
-                            }
-                        });
+                    let hid = egui::Id::new(("ol-height", s.id.0));
+                    let known: Option<f32> = ui.data(|d| d.get_temp(hid));
+                    let h = known.unwrap_or_else(|| outline_estimate(s));
+                    let y = ui.cursor().top() - origin;
+                    if i == cur || (y + h >= viewport.min.y - margin && y <= viewport.max.y + margin) {
+                        outline_slide(app, ui, &t, i, s, cur);
+                        let real = ui.cursor().top() - origin - y;
+                        ui.data_mut(|d| d.insert_temp(hid, real));
+                    } else {
+                        ui.allocate_exact_size(vec2(ui.available_width(), (h - ui.spacing().item_spacing.y).max(0.0)), Sense::hover());
                     }
-                    ui.add_space(6.0);
                 }
             });
         },
     );
 }
+
+/// A slide's outline block height before it has been laid out: title row plus its text lines.
+fn outline_estimate(s: &deckcraft_model::Slide) -> f32 {
+    let lines: usize = s
+        .shapes
+        .iter()
+        .filter(|x| !x.ph_type().is_some_and(|k| k.is_title()))
+        .filter_map(|x| x.text.as_ref())
+        .filter(|tb| !tb.is_empty())
+        .map(|tb| tb.paragraphs.len().max(1))
+        .sum();
+    30.0 + lines as f32 * 19.0
+}
+
+/// One slide in the outline: number, title editor, then its other text.
+fn outline_slide(app: &mut SlideApp, ui: &mut Ui, t: &Tokens, i: usize, s: &deckcraft_model::Slide, cur: usize) {
+    let title_shape = s.shapes.iter().find(|x| x.ph_type().is_some_and(|k| k.is_title())).map(|x| x.id.0);
+    ui.horizontal(|ui| {
+        ui.label(egui::RichText::new(format!("{}", i + 1)).color(t.text_dim));
+        let (r, _) = ui.allocate_exact_size(vec2(14.0, 10.0), Sense::hover());
+        ui.painter().rect_stroke(r, CornerRadius::same(1), Stroke::new(1.0, if i == cur { t.accent } else { t.text_dim }), egui::StrokeKind::Inside);
+        let id = egui::Id::new(("ol-title", s.id.0));
+        let cur_title = s.title();
+        let mut v: String = ui.data_mut(|d| d.get_temp(id).unwrap_or_else(|| cur_title.clone()));
+        let resp = ui.add(egui::TextEdit::singleline(&mut v).font(theme::bold(14.0)).frame(egui::Frame::NONE).desired_width(f32::INFINITY));
+        if resp.gained_focus() {
+            let _ = app.run("slide.go", json!({"index": i}));
+        }
+        if resp.lost_focus()
+            && v != cur_title
+            && let Some(tid) = title_shape
+        {
+            let _ = app.run("text.set", json!({"id": tid, "text": v}));
+        }
+        if !resp.has_focus() {
+            ui.data_mut(|d| d.remove::<String>(id));
+        } else {
+            ui.data_mut(|d| d.insert_temp(id, v));
+        }
+    });
+    for sh in s.shapes.iter().filter(|x| !x.ph_type().is_some_and(|k| k.is_title())) {
+        let Some(tb) = &sh.text else { continue };
+        if tb.is_empty() {
+            continue;
+        }
+        let id = egui::Id::new(("ol-body", s.id.0, sh.id.0));
+        let cur_text: String = tb.paragraphs.iter().map(|p| format!("{}{}", "\t".repeat(p.level as usize), p.text())).collect::<Vec<_>>().join("\n");
+        let mut v: String = ui.data_mut(|d| d.get_temp(id).unwrap_or_else(|| cur_text.clone()));
+        ui.horizontal(|ui| {
+            ui.add_space(36.0);
+            let resp = ui.add(egui::TextEdit::multiline(&mut v).frame(egui::Frame::NONE).desired_width(f32::INFINITY).desired_rows(1));
+            if resp.gained_focus() {
+                let _ = app.run("slide.go", json!({"index": i}));
+            }
+            if resp.lost_focus() && v != cur_text {
+                let _ = app.run("text.set", json!({"id": sh.id.0, "text": v}));
+            }
+            if !resp.has_focus() {
+                ui.data_mut(|d| d.remove::<String>(id));
+            } else {
+                ui.data_mut(|d| d.insert_temp(id, v.clone()));
+            }
+        });
+    }
+    ui.add_space(6.0);
+}

From 800c2008dfe7a56a5b2dd27ce5945640e34578f2 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:15:05 +0300
Subject: [PATCH 292/376] PPTX: table styles the file defines are kept on save
 even when no table uses them

---
 crates/pptx/src/tables.rs         | 10 ++++++++++
 crates/pptx/tests/table_styles.rs | 13 +++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/crates/pptx/src/tables.rs b/crates/pptx/src/tables.rs
index 24b011c3..67d25d62 100644
--- a/crates/pptx/src/tables.rs
+++ b/crates/pptx/src/tables.rs
@@ -229,6 +229,16 @@ pub fn table_styles_xml(used: &[String], defs: &[deckcraft_model::table::TableSt
         let name = names.iter().find(|(id, _)| id == s).map(|(_, n)| format!("DeckCraft {n}")).unwrap_or_else(|| s.clone());
         style_def(&mut w, s, &name);
     }
+    // Styles the file defined but no table uses still belong to the deck.
+    for d in defs {
+        if done.iter().any(|s| s.eq_ignore_ascii_case(&d.id)) {
+            continue;
+        }
+        if crate::xml::parse(d.raw.as_bytes()).is_ok_and(|x| x.root.is("tblStyle")) {
+            done.push(&d.id);
+            w.raw(&d.raw);
+        }
+    }
     w.close("a:tblStyleLst");
     w.finish()
 }
diff --git a/crates/pptx/tests/table_styles.rs b/crates/pptx/tests/table_styles.rs
index 015543f2..27fca053 100644
--- a/crates/pptx/tests/table_styles.rs
+++ b/crates/pptx/tests/table_styles.rs
@@ -82,3 +82,16 @@ fn table_styles_the_file_defines_are_read_used_and_kept() {
     let def2 = q.table_styles.iter().find(|d| d.id == STYLE_GUID).expect("kept on save");
     assert_eq!(def2.parts, def.parts);
 }
+
+#[test]
+fn table_style_no_table_uses_is_kept_on_save() {
+    let mut p = deckcraft_pptx::import(&table_deck()).expect("import");
+    assert!(p.table_styles.iter().any(|d| d.id == STYLE_GUID));
+    // Drop the only table that uses the style; the deck still defines it.
+    for s in &mut p.slides {
+        std::sync::Arc::make_mut(s).shapes.retain(|sh| !matches!(sh.kind, deckcraft_model::ShapeKind::Table(_)));
+    }
+    let q = deckcraft_pptx::import(&deckcraft_pptx::export(&p).expect("export")).expect("reimport");
+    let d = q.table_styles.iter().find(|d| d.id == STYLE_GUID).expect("style kept");
+    assert_eq!(d.name, "Probe Style");
+}

From 2f3a5255682f1467480995f5ef242b6b73dd424b Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:16:14 +0300
Subject: [PATCH 293/376] UI: Format Shape fill transparency follows the
 selection

The Fill slider seeded itself at 0% and wrote that when it lost focus, so a
solid fill that was already transparent opened as opaque and could be cleared.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                  |   4 +-
 crates/ui-egui/src/panes.rs | 127 ++++++++++++++++++++++++++++++++++--
 docs/ui-parity.md           |   5 +-
 3 files changed, 129 insertions(+), 7 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..56909db5 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Format Shape fill transparency follows the selection; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Format Shape: the Fill transparency slider shows the selected solid fill, and leaving it no longer clears that transparency |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Format Shape fill transparency follows the selection |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 2b3ada3a..6c387f56 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -59,6 +59,29 @@ fn run(app: &mut SlideApp, id: &str, p: Value) {
     let _ = app.run(id, p);
 }
 
+/// Percent transparency (0 = opaque) of a solid fill, the same number `shape.fill`'s
+/// `transparency` parameter writes as an alpha transform. Anything else — no fill, a
+/// gradient, a picture, a pattern — is 0, because that command only changes a solid.
+fn solid_fill_transparency_percent(fill: Option<&Fill>) -> f32 {
+    let Some(Fill::Solid { color }) = fill else {
+        return 0.0;
+    };
+    ((1.0 - color.alpha()) * 100.0) as f32
+}
+
+/// Fraction to pass to `shape.fill` when the slider moved. An unchanged value (a focus
+/// loss, or switching to another shape) is `None`, so the pane does not rewrite the fill.
+fn fill_transparency_to_apply(shown_percent: f32, seed_percent: f32) -> Option<f64> {
+    if !shown_percent.is_finite() {
+        return None;
+    }
+    let shown = shown_percent.clamp(0.0, 100.0);
+    if (shown - seed_percent).abs() <= 0.01 {
+        return None;
+    }
+    Some(f64::from(shown) / 100.0)
+}
+
 fn scheme(app: &SlideApp) -> deckcraft_color::ColorScheme {
     app.session.active().and_then(|d| d.doc.masters.first().map(|m| m.scheme())).unwrap_or_else(|| deckcraft_model::Theme::default().colors)
 }
@@ -285,12 +308,19 @@ fn format_shape(app: &mut SlideApp, ui: &mut Ui) {
             });
             ui.horizontal(|ui| {
                 ui.label("Transparency");
-                let id = ui.id().with("ftr");
-                let mut v: f32 = ui.data_mut(|d| d.get_temp(id).unwrap_or(0.0));
+                // Seed from this shape. A shared temp defaulted to 0, so a shape that was
+                // already 40% transparent showed as opaque, and leaving the slider wrote 0.
+                let seed = solid_fill_transparency_percent(sh.fill.as_ref());
+                let id = ui.id().with(("ftr", sh.id.0));
+                let mut v: f32 = ui.data_mut(|d| d.get_temp(id).unwrap_or(seed));
                 let r = ui.add(egui::Slider::new(&mut v, 0.0..=100.0).suffix("%"));
-                ui.data_mut(|d| d.insert_temp(id, v));
                 if r.drag_stopped() || r.lost_focus() {
-                    let _ = app.run("shape.fill", json!({"transparency": v as f64 / 100.0}));
+                    if let Some(t) = fill_transparency_to_apply(v, seed) {
+                        let _ = app.run("shape.fill", json!({"transparency": t}));
+                    }
+                    ui.data_mut(|d| d.remove::<f32>(id));
+                } else if r.dragged() || r.changed() {
+                    ui.data_mut(|d| d.insert_temp(id, v));
                 }
             });
             if let Some(Fill::Gradient(g)) = &sh.fill {
@@ -635,3 +665,92 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
         ui.add_space(8.0);
     }
 }
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
+    use deckcraft_color::{ColorTransform, SchemeSlot};
+    use deckcraft_engine::Session;
+    use deckcraft_model::{ColorRef, Fill, ShapeId};
+    use egui_kittest::Harness;
+    use egui_kittest::kittest::{NodeT, Queryable};
+    use serde_json::json;
+
+    use super::{fill_transparency_to_apply, solid_fill_transparency_percent};
+    use crate::{Services, SlideApp};
+
+    #[test]
+    fn solid_fill_transparency_reads_the_alpha_shape_fill_writes() {
+        assert_eq!(solid_fill_transparency_percent(None), 0.0);
+        assert_eq!(solid_fill_transparency_percent(Some(&Fill::None)), 0.0);
+        assert_eq!(solid_fill_transparency_percent(Some(&Fill::Group)), 0.0);
+        let plain = Fill::solid(ColorRef::scheme(SchemeSlot::Accent1));
+        assert_eq!(solid_fill_transparency_percent(Some(&plain)), 0.0);
+        // `shape.fill` transparency 0.4 stores Alpha((1 - 0.4) * 100_000).
+        let forty = Fill::solid(ColorRef::scheme(SchemeSlot::Accent1).with(ColorTransform::Alpha(60_000)));
+        let p = solid_fill_transparency_percent(Some(&forty));
+        assert!((p - 40.0).abs() < 0.01, "{p}");
+        let clear = Fill::solid(ColorRef::scheme(SchemeSlot::Accent1).with(ColorTransform::Alpha(0)));
+        assert!((solid_fill_transparency_percent(Some(&clear)) - 100.0).abs() < 0.01);
+        // A later alpha wins, matching ColorRef::alpha.
+        let layered = Fill::solid(ColorRef::scheme(SchemeSlot::Accent1).with(ColorTransform::Alpha(0)).with(ColorTransform::Alpha(60_000)));
+        assert!((solid_fill_transparency_percent(Some(&layered)) - 40.0).abs() < 0.01);
+
+        assert_eq!(fill_transparency_to_apply(40.0, 40.0), None);
+        assert_eq!(fill_transparency_to_apply(40.005, 40.0), None);
+        assert_eq!(fill_transparency_to_apply(f32::NAN, 40.0), None);
+        assert_eq!(fill_transparency_to_apply(55.0, 40.0), Some(0.55));
+        assert_eq!(fill_transparency_to_apply(0.0, 40.0), Some(0.0));
+    }
+
+    fn solid_alpha(app: &SlideApp, id: u32) -> Option<i32> {
+        let sh = app.session.active()?.shape(ShapeId(id))?;
+        let Fill::Solid { color } = sh.fill.as_ref()? else { return None };
+        color.mods.iter().find_map(|m| match m {
+            ColorTransform::Alpha(v) => Some(*v),
+            _ => None,
+        })
+    }
+
+    fn slider_values(h: &Harness<'_, SlideApp>) -> Vec<f64> {
+        h.query_all_by_role(egui::accesskit::Role::Slider).filter_map(|n| n.accesskit_node().numeric_value()).collect()
+    }
+
+    /// The Fill slider shows the selected solid's transparency, and opening the pane
+    /// (or looking at another shape first) does not write 0% over it.
+    #[test]
+    fn fill_transparency_slider_follows_the_selection() {
+        let mut s = Session::with_new();
+        s.execute("slide.new", &json!({"layout": "blank"})).unwrap();
+        let a = s.execute("shape.insert", &json!({"preset": "rect", "rect": [40.0, 40.0, 120.0, 80.0]})).unwrap()["id"].as_u64().unwrap() as u32;
+        let b = s.execute("shape.insert", &json!({"preset": "rect", "rect": [200.0, 40.0, 120.0, 80.0]})).unwrap()["id"].as_u64().unwrap() as u32;
+        s.execute("shape.fill", &json!({"id": a, "color": "accent1", "transparency": 0.0})).unwrap();
+        s.execute("shape.fill", &json!({"id": b, "color": "accent1", "transparency": 0.4})).unwrap();
+        s.execute("edit.select", &json!({"ids": [a]})).unwrap();
+        let mut app = SlideApp::new(s, Services::default());
+        app.ui.pane = Some("format".into());
+        app.ui.format_tab = "fill".into();
+        let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            app,
+        );
+        h.run_steps(3);
+        let opaque: Vec<f64> = slider_values(&h);
+        assert!(opaque.iter().any(|v| (*v - 0.0).abs() < 0.5), "opaque shape should show 0%, got {opaque:?}");
+        assert!(opaque.iter().all(|v| (*v - 40.0).abs() > 0.5), "opaque shape should not show 40%, got {opaque:?}");
+
+        h.state_mut().session.execute("edit.select", &json!({"ids": [b]})).unwrap();
+        h.run_steps(3);
+        let clear: Vec<f64> = slider_values(&h);
+        assert!(clear.iter().any(|v| (*v - 40.0).abs() < 0.5), "40% fill should show 40%, got {clear:?}");
+        assert_eq!(solid_alpha(h.state(), b), Some(60_000));
+
+        h.get_by_label("Transparency").click();
+        h.run_steps(2);
+        assert_eq!(solid_alpha(h.state(), b), Some(60_000));
+    }
+}
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..b95223a4 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,6 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Format Shape fill transparency follows the selection; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
@@ -58,7 +58,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 
 | Pane / dialog | PowerPoint | DeckCraft |
 |---|---|---|
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
+| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill (solid transparency follows the selection), gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
 | Format Background pane | yes | yes |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Format Shape Fill transparency slider follows the selected solid fill and does not clear it on focus loss |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 5115f77f08aeb4daa64849abce80d7c3b90adc53 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:20:10 +0300
Subject: [PATCH 294/376] Media: damaged audio no longer hangs the demux loop
 or panics in symphonia

---
 ATTRIBUTION.md                                |   1 +
 crates/media/src/audio.rs                     |  26 ++++++++++++---
 crates/media/src/probe.rs                     |   6 ++--
 crates/media/tests/decode.rs                  |  30 ++++++++++++++++++
 .../tests/fixtures/damaged/demux-loop.m4a     | Bin 0 -> 5324 bytes
 .../tests/fixtures/damaged/demux-loop.mp4     | Bin 0 -> 6102 bytes
 .../tests/fixtures/damaged/ebml-header.mkv    | Bin 0 -> 905 bytes
 .../tests/fixtures/damaged/ebml-position.webm | Bin 0 -> 3914 bytes
 8 files changed, 57 insertions(+), 6 deletions(-)
 create mode 100644 crates/media/tests/fixtures/damaged/demux-loop.m4a
 create mode 100644 crates/media/tests/fixtures/damaged/demux-loop.mp4
 create mode 100644 crates/media/tests/fixtures/damaged/ebml-header.mkv
 create mode 100644 crates/media/tests/fixtures/damaged/ebml-position.webm

diff --git a/ATTRIBUTION.md b/ATTRIBUTION.md
index 9ca8e5e8..66c85d41 100644
--- a/ATTRIBUTION.md
+++ b/ATTRIBUTION.md
@@ -26,6 +26,7 @@ deck and UI icons are original work of the DeckCraft contributors (drawn or gene
 | `docs/images/editor.png`, `docs/images/shape-format.png`, `docs/images/format-pane.png`, `docs/images/slide-sorter.png`, `docs/images/dark-mode.png`, `docs/images/sample-deck.png` | DeckCraft contributors | Screenshots of DeckCraft and slides rendered by `deckcraft-cli` from the built-in sample deck (original content; Inter font, OFL-1.1) | MIT OR Apache-2.0 | README screenshots |
 | `crates/media/tests/fixtures/tone*` (`tone.mp3`, `.m4a`, `.aac`, `.ogg`, `.opus`, `.flac`, `.wma`, `tone-alac.m4a`) | DeckCraft contributors | synthesised 0.5 s 440 Hz sine, encoded by `crates/media/tests/fixtures/make.sh` (ffmpeg as the encoder only) | CC0-1.0 | Audio decoding tests |
 | `crates/media/tests/fixtures/clip-*` (`clip-h264.mp4`, `clip-h264.mov`, `clip-hevc.mp4`, `clip-vp9.webm`, `clip-av1.mkv`) | DeckCraft contributors | 6 frames of a colour gradient generated by `make.sh` (python3), encoded by ffmpeg (x264 / x265 / libvpx / SVT-AV1 as encoders only) | CC0-1.0 | Video decoding tests |
+| `crates/media/tests/fixtures/damaged/*` (`ebml-header.mkv`, `ebml-position.webm`, `demux-loop.mp4`, `demux-loop.m4a`) | DeckCraft contributors | the `clip-*` and `tone*` fixtures above with bytes changed by a mutation fuzzer | CC0-1.0 | Damaged media must not panic or hang |
 | `crates/media/tests/fixtures/make.sh` | DeckCraft contributors | this repository | MIT OR Apache-2.0 | Regenerates the media fixtures |
 | `crates/render/tests/fixtures/colr-squares.ttf` | DeckCraft contributors | two squares as a COLRv0/CPAL test font, built by `make_colr_font.py` (fontTools as the builder only) | CC0-1.0 | Colour glyph rendering tests |
 | `crates/fonts/tests/fixtures/legacy-semibold.ttf` | DeckCraft contributors | a one-glyph Semibold face named like Segoe UI Semibold (its Windows family differs from the typographic one), built by `make_legacy_font.py` (fontTools as the builder only) | CC0-1.0 | Font lookup by Windows family name tests |
diff --git a/crates/media/src/audio.rs b/crates/media/src/audio.rs
index 80ad66a4..e641113a 100644
--- a/crates/media/src/audio.rs
+++ b/crates/media/src/audio.rs
@@ -71,13 +71,13 @@ pub fn decode(bytes: &Bytes) -> Result<Pcm> {
         Container::Asf => Err(MediaError::Unsupported("Windows Media Audio (WMA)".into())),
         Container::Ogg => match decode_ogg_opus(bytes) {
             Some(r) => r,
-            None => decode_symphonia(bytes, "ogg"),
+            None => contained(|| decode_symphonia(bytes, "ogg")),
         },
         Container::Matroska => match decode_mkv_opus(bytes) {
             Some(r) => r,
-            None => decode_symphonia(bytes, "mkv"),
+            None => contained(|| decode_symphonia(bytes, "mkv")),
         },
-        c => decode_symphonia(bytes, c.name()),
+        c => contained(|| decode_symphonia(bytes, c.name())),
     }
 }
 
@@ -142,6 +142,15 @@ fn sym_err(e: SymError) -> MediaError {
     }
 }
 
+/// Runs symphonia, whose demuxers can panic on damaged files (Matroska's EBML reader asserts
+/// its position, for one): the panic becomes a corrupt-file error instead of ending the app.
+fn contained<T>(f: impl FnOnce() -> Result<T>) -> Result<T> {
+    std::panic::catch_unwind(std::panic::AssertUnwindSafe(f)).unwrap_or_else(|_| Err(MediaError::Corrupt("the audio could not be read".into())))
+}
+
+/// Demux errors in a row after which a file is taken to have no more audio.
+const MAX_DEMUX_ERRORS: u32 = 64;
+
 fn decode_symphonia(bytes: &Bytes, ext: &str) -> Result<Pcm> {
     let mss = MediaSourceStream::new(Box::new(Cursor::new(Shared(bytes.clone()))), MediaSourceStreamOptions::default());
     let mut hint = Hint::new();
@@ -172,12 +181,21 @@ fn decode_symphonia(bytes: &Bytes, ext: &str) -> Result<Pcm> {
     let mut rate = 0;
     let mut channels = 0u16;
     let mut buf: Option<SampleBuffer<f32>> = None;
+    // A damaged file can make the demuxer report the same error forever without moving on.
+    let mut demux_errors = 0u32;
     loop {
         let packet = match format.next_packet() {
-            Ok(p) => p,
+            Ok(p) => {
+                demux_errors = 0;
+                p
+            }
             Err(SymError::IoError(_)) | Err(SymError::ResetRequired) => break,
             Err(SymError::DecodeError(e)) => {
                 log::debug!("audio demux: {e}");
+                demux_errors += 1;
+                if demux_errors > MAX_DEMUX_ERRORS {
+                    break;
+                }
                 continue;
             }
             Err(e) => {
diff --git a/crates/media/src/probe.rs b/crates/media/src/probe.rs
index 80a8a380..40afcbe8 100644
--- a/crates/media/src/probe.rs
+++ b/crates/media/src/probe.rs
@@ -58,8 +58,10 @@ pub fn probe(bytes: &Bytes) -> Result<MediaInfo> {
     };
     if info.audio.is_none() && info.video.is_none() || info.audio.as_ref().is_some_and(|a| a.sample_rate == 0) {
         // Plain audio files (and anything our demuxers didn't describe): symphonia's probe.
-        let (codec, rate, channels, frames) =
-            crate::audio::probe_symphonia(bytes, c.name()).ok_or_else(|| MediaError::Unsupported("this kind of media file".into()))?;
+        let (codec, rate, channels, frames) = std::panic::catch_unwind(|| crate::audio::probe_symphonia(bytes, c.name()))
+            .ok()
+            .flatten()
+            .ok_or_else(|| MediaError::Unsupported("this kind of media file".into()))?;
         info.audio = Some(AudioInfo { codec: codec_label(&codec), sample_rate: rate, channels, decodable: true });
         if info.duration_ms == 0
             && let Some(n) = frames
diff --git a/crates/media/tests/decode.rs b/crates/media/tests/decode.rs
index b3179445..db53c056 100644
--- a/crates/media/tests/decode.rs
+++ b/crates/media/tests/decode.rs
@@ -325,3 +325,33 @@ fn player_plays_decoded_audio_through_the_mixer() {
     assert!((rms - 0.0884 * 0.5).abs() < 0.005, "{rms}");
     assert!((p.status(1).map(|s| s.position).unwrap_or(0.0) - 0.1).abs() < 1e-6);
 }
+
+/// Damaged files found by mutation fuzzing the fixtures above (so CC0 like them): each must come
+/// back as an error or as audio — not panic (symphonia's Matroska reader panics on the first two)
+/// and not hang (the MP4 demuxer reported the same error forever on the last two).
+#[test]
+fn damaged_media_neither_panics_nor_hangs() {
+    for name in ["damaged/ebml-header.mkv", "damaged/ebml-position.webm", "damaged/demux-loop.mp4", "damaged/demux-loop.m4a"] {
+        let b = fixture(name);
+        let (tx, rx) = std::sync::mpsc::channel();
+        std::thread::spawn(move || {
+            let ok = std::panic::catch_unwind(|| {
+                let _ = probe::probe(&b);
+                let _ = audio::decode(&b);
+                if let Ok(mut d) = video::VideoDecoder::open(b.clone()) {
+                    for _ in 0..12 {
+                        if !matches!(d.next_frame(), Ok(Some(_))) {
+                            break;
+                        }
+                    }
+                }
+            })
+            .is_ok();
+            let _ = tx.send(ok);
+        });
+        match rx.recv_timeout(Duration::from_secs(20)) {
+            Ok(ok) => assert!(ok, "{name} panicked"),
+            Err(_) => panic!("{name} still decoding after 20 s"),
+        }
+    }
+}
diff --git a/crates/media/tests/fixtures/damaged/demux-loop.m4a b/crates/media/tests/fixtures/damaged/demux-loop.m4a
new file mode 100644
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diff --git a/crates/media/tests/fixtures/damaged/ebml-position.webm b/crates/media/tests/fixtures/damaged/ebml-position.webm
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From 26d8bfdd3a6affb01f1761c797a09d7533168750 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:21:07 +0300
Subject: [PATCH 295/376] UI: Design Effects applies a theme effect scheme

design.effects replaces the theme's format scheme (fills, lines and
effects) with DeckCraft, Soft, Crisp, Lift, Glow or Plain. Colours and
fonts stay. The scheme already in use is not an undo step.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                          |  4 +-
 crates/engine/src/cmd/design.rs     | 74 ++++++++++++++++++++++++++++-
 crates/model/src/theme.rs           | 56 +++++++++++++++++++++-
 crates/ui-egui/src/effects_tests.rs | 45 ++++++++++++++++++
 crates/ui-egui/src/ribbon.rs        | 14 ++++++
 docs/architecture.md                |  5 +-
 docs/gaps.md                        |  3 +-
 docs/target-app-parity.md           | 10 ++--
 docs/ui-parity.md                   |  6 ++-
 9 files changed, 204 insertions(+), 13 deletions(-)
 create mode 100644 crates/ui-egui/src/effects_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..2bfc79e1 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Design ▸ Effects; percentages unchanged) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Design ▸ Effects: named effect schemes (DeckCraft, Soft, Crisp, Lift, Glow, Plain) replace the theme's fills, lines and effects and leave colours and fonts. `design.effects` |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Design ▸ Effects |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..9d6ac1a2 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -5,7 +5,7 @@ use std::sync::Arc;
 
 use deckcraft_geom::Size;
 use deckcraft_model::text::{Run, RunKind, TextBody};
-use deckcraft_model::theme::{builtin_color_schemes, builtin_font_schemes, builtin_themes};
+use deckcraft_model::theme::{builtin_color_schemes, builtin_font_schemes, builtin_format_schemes, builtin_themes};
 use deckcraft_model::{Background, Fill, PhType, Presentation, Shape, ShapeId, defaults};
 use serde_json::{Value, json};
 
@@ -15,9 +15,10 @@ use crate::{Result, Session, Target};
 pub fn specs() -> Vec<CommandSpec> {
     vec![
         cmd!("design.theme", "Themes", ["Design", "Themes"], None, "{name} (see design.themes)", has_doc, theme),
-        cmd!(query "design.themes", "Theme Gallery", [], None, "{} → themes, colour schemes and font schemes", always, themes),
+        cmd!(query "design.themes", "Theme Gallery", [], None, "{} → themes, colour schemes, font schemes and effect schemes", always, themes),
         cmd!("design.colors", "Colors", ["Design", "Variants"], None, "{name} | {colors: {accent1: #RRGGBB, …}}", has_doc, colors),
         cmd!("design.fonts", "Fonts", ["Design", "Variants"], None, "{name} | {major, minor}", has_doc, fonts),
+        cmd!("design.effects", "Effects", ["Design", "Variants"], None, "{name} (see design.themes)", has_doc, effects),
         cmd!(
             "design.background",
             "Format Background",
@@ -91,6 +92,7 @@ fn themes(_s: &mut Session, _p: &Value) -> Result<Value> {
         "themes": builtin_themes().iter().map(|t| json!({"name": t.name, "major": t.fonts.major.latin, "minor": t.fonts.minor.latin, "colors": t.colors.colors.iter().map(|c| format!("#{}", c.hex())).collect::<Vec<_>>()})).collect::<Vec<_>>(),
         "colorSchemes": builtin_color_schemes().iter().map(|c| c.name.clone()).collect::<Vec<_>>(),
         "fontSchemes": builtin_font_schemes().iter().map(|f| json!({"name": f.name, "major": f.major.latin, "minor": f.minor.latin})).collect::<Vec<_>>(),
+        "effectSchemes": builtin_format_schemes().iter().map(|f| f.name.clone()).collect::<Vec<_>>(),
     }))
 }
 
@@ -148,6 +150,29 @@ fn fonts(s: &mut Session, p: &Value) -> Result<Value> {
     ok()
 }
 
+fn effects(s: &mut Session, p: &Value) -> Result<Value> {
+    let name = str_param(p, "name").ok_or_else(|| bad("design.effects", "missing `name`"))?;
+    let scheme = builtin_format_schemes()
+        .into_iter()
+        .find(|f| f.name.eq_ignore_ascii_case(name))
+        .ok_or_else(|| bad("design.effects", format!("no effect scheme `{name}`")))?;
+    let stored = scheme.name.clone();
+    let same = {
+        let st = s.doc()?;
+        let mi = master_index(&st.doc, &st.selection);
+        st.doc.masters.get(mi).is_some_and(|m| m.theme.format == scheme)
+    };
+    if same {
+        return Ok(json!({"name": stored}));
+    }
+    s.edit(|doc, sel| {
+        let mi = master_index(doc, sel);
+        Arc::make_mut(doc.masters.get_mut(mi).ok_or_else(|| bad("design.effects", "no master"))?).theme.format = scheme;
+        Ok(())
+    })?;
+    Ok(json!({"name": stored}))
+}
+
 fn background(s: &mut Session, p: &Value) -> Result<Value> {
     let bg: Option<Background> = if bool_or(p, "reset", false) {
         None
@@ -558,9 +583,54 @@ fn insert_placeholder(s: &mut Session, p: &Value) -> Result<Value> {
 
 #[cfg(test)]
 mod tests {
+    use serde_json::json;
+
     #[test]
     fn civil_dates() {
         assert_eq!(super::civil(0), (1970, 1, 1));
         assert_eq!(super::civil(20_734), (2026, 10, 8));
     }
+
+    fn undo_len(s: &crate::Session) -> usize {
+        s.doc().unwrap().history.undo.len()
+    }
+
+    #[test]
+    fn effect_scheme_replaces_format_and_keeps_colours_and_fonts() {
+        let mut s = crate::Session::with_new();
+        let listed = s.execute("design.themes", &json!({})).unwrap();
+        let names: Vec<String> = listed["effectSchemes"].as_array().unwrap().iter().filter_map(|v| v.as_str().map(str::to_string)).collect();
+        assert_eq!(names, ["DeckCraft", "Soft", "Crisp", "Lift", "Glow", "Plain"]);
+
+        let n = undo_len(&s);
+        s.execute("design.effects", &json!({"name": "DeckCraft"})).unwrap();
+        assert_eq!(undo_len(&s), n, "the scheme already on the theme is not an undo step");
+        let err = s.execute("design.effects", &json!({"name": "Office"})).unwrap_err().to_string();
+        assert!(err.contains("no effect scheme"), "{err}");
+        assert!(s.execute("design.effects", &json!({})).is_err());
+        assert_eq!(undo_len(&s), n);
+
+        s.execute("design.theme", &json!({"name": "Harbor"})).unwrap();
+        let before = s.doc().unwrap().doc.masters[0].theme.clone();
+        s.execute("design.effects", &json!({"name": "soft"})).unwrap();
+        let theme = s.doc().unwrap().doc.masters[0].theme.clone();
+        assert_eq!(theme.name, "Harbor");
+        assert_eq!(theme.colors, before.colors);
+        assert_eq!(theme.fonts, before.fonts);
+        assert_eq!(theme.format.name, "Soft");
+        assert!(theme.format.effects[0].outer_shadow.is_some());
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Effects");
+
+        let n = undo_len(&s);
+        s.execute("design.effects", &json!({"name": "Soft"})).unwrap();
+        assert_eq!(undo_len(&s), n, "the same scheme is not an undo step");
+
+        s.execute("design.effects", &json!({"name": "Glow"})).unwrap();
+        let glow = s.doc().unwrap().doc.masters[0].theme.format.effects[2].glow.clone();
+        assert!(glow.is_some_and(|g| (g.radius - 12.0).abs() < 1e-6));
+        s.execute("design.effects", &json!({"name": "Plain"})).unwrap();
+        let plain = s.doc().unwrap().doc.masters[0].theme.format.clone();
+        assert!(plain.effects.iter().all(|e| e.outer_shadow.is_none() && e.glow.is_none()));
+        assert_eq!(plain.lines[2].width, Some(0.75));
+    }
 }
diff --git a/crates/model/src/theme.rs b/crates/model/src/theme.rs
index 582f0728..cd5dc496 100644
--- a/crates/model/src/theme.rs
+++ b/crates/model/src/theme.rs
@@ -3,7 +3,7 @@
 use deckcraft_color::{ColorScheme, ColorTransform, Rgba, SchemeSlot};
 use serde::{Deserialize, Serialize};
 
-use crate::style::{ColorRef, Effects, Fill, Gradient, GradientShape, GradientStop, Line, Shadow};
+use crate::style::{ColorRef, Effects, Fill, Glow, Gradient, GradientShape, GradientStop, Line, Shadow};
 
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
 #[serde(default, rename_all = "camelCase")]
@@ -268,3 +268,57 @@ pub fn builtin_font_schemes() -> Vec<FontScheme> {
         f("Times / Arial", "Liberation Serif", "Liberation Sans"),
     ]
 }
+
+fn shadow(blur: f64, dist: f64, alpha: i32) -> Effects {
+    Effects {
+        outer_shadow: Some(Shadow {
+            color: ColorRef::rgb(Rgba::BLACK).with(ColorTransform::Alpha(alpha)),
+            blur,
+            dist,
+            dir: 90.0,
+            inner: false,
+            sx: 1.0,
+            sy: 1.0,
+            kx: 0.0,
+            ky: 0.0,
+            align: "b".into(),
+            rotate_with_shape: false,
+        }),
+        ..Default::default()
+    }
+}
+
+fn glow(radius: f64) -> Effects {
+    Effects { glow: Some(Glow { color: ph().with(ColorTransform::Alpha(60_000)), radius }), ..Default::default() }
+}
+
+/// Named effect schemes for Design ▸ Effects. Each one replaces the theme's format scheme
+/// (subtle, moderate and intense fills, lines and effects) and leaves the colour and font schemes.
+pub fn builtin_format_schemes() -> Vec<FormatScheme> {
+    let mut soft = default_format();
+    soft.name = "Soft".into();
+    soft.lines = vec![Line::solid(ph(), 0.5), Line::solid(ph(), 0.75), Line::solid(ph(), 1.0)];
+    soft.effects = vec![shadow(16.0, 1.0, 18_000), shadow(12.0, 2.0, 22_000), shadow(10.0, 3.0, 28_000)];
+
+    let mut crisp = default_format();
+    crisp.name = "Crisp".into();
+    crisp.fills = vec![Fill::solid(ph()), Fill::solid(ph()), Fill::solid(ph())];
+    crisp.lines = vec![Line::solid(ph(), 1.0), Line::solid(ph(), 1.5), Line::solid(ph(), 2.25)];
+    crisp.effects = vec![Effects::default(), Effects::default(), shadow(0.0, 2.0, 55_000)];
+
+    let mut lift = default_format();
+    lift.name = "Lift".into();
+    lift.effects = vec![Effects::default(), shadow(8.0, 6.0, 28_000), shadow(12.0, 10.0, 35_000)];
+
+    let mut glow_scheme = default_format();
+    glow_scheme.name = "Glow".into();
+    glow_scheme.effects = vec![Effects::default(), glow(6.0), glow(12.0)];
+
+    let mut plain = default_format();
+    plain.name = "Plain".into();
+    plain.fills = vec![Fill::solid(ph()), Fill::solid(ph()), Fill::solid(ph())];
+    plain.lines = vec![Line::solid(ph(), 0.75), Line::solid(ph(), 0.75), Line::solid(ph(), 0.75)];
+    plain.effects = vec![Effects::default(), Effects::default(), Effects::default()];
+
+    vec![default_format(), soft, crisp, lift, glow_scheme, plain]
+}
diff --git a/crates/ui-egui/src/effects_tests.rs b/crates/ui-egui/src/effects_tests.rs
new file mode 100644
index 00000000..37d856fe
--- /dev/null
+++ b/crates/ui-egui/src/effects_tests.rs
@@ -0,0 +1,45 @@
+//! Design ▸ Effects: the menu applies a theme effect scheme.
+
+use deckcraft_engine::Session;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+
+use crate::{Services, SlideApp};
+
+fn harness() -> Harness<'static, SlideApp> {
+    let mut app = SlideApp::new(Session::with_new(), Services::default());
+    app.ui.tab = "Design".into();
+    let mut h = Harness::builder().with_size(egui::vec2(1800.0, 900.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn format_name(h: &Harness<'_, SlideApp>) -> String {
+    h.state().session.active().unwrap().doc.masters[0].theme.format.name.clone()
+}
+
+#[test]
+fn effects_menu_applies_a_scheme_once() {
+    let mut h = harness();
+    assert_eq!(format_name(&h), "DeckCraft");
+    let n = h.state().session.active().unwrap().history.undo.len();
+    h.get_by_label("Effects").click();
+    h.run_steps(2);
+    h.get_by_label("Soft").click();
+    h.run_steps(2);
+    assert_eq!(format_name(&h), "Soft");
+    assert_eq!(h.state().session.active().unwrap().history.undo.len(), n + 1);
+    assert_eq!(h.state().session.active().unwrap().doc.masters[0].theme.name, "DeckCraft");
+
+    h.get_by_label("Effects").click();
+    h.run_steps(2);
+    h.get_by_label("Soft").click();
+    h.run_steps(2);
+    assert_eq!(h.state().session.active().unwrap().history.undo.len(), n + 1, "the same scheme is not an undo step");
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..0fe012c6 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1263,6 +1263,16 @@ fn design(app: &mut SlideApp, ui: &mut Ui) {
                 }
             }
         });
+        let r = big_button(ui, Icon::ShapeEffects, "Effects", true);
+        r.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, true, "Effects"));
+        egui::Popup::menu(&r).width(180.0).show(|ui| {
+            for fs in deckcraft_model::theme::builtin_format_schemes() {
+                if ui.button(&fs.name).clicked() {
+                    run(app, "design.effects", json!({"name": fs.name}));
+                    ui.close();
+                }
+            }
+        });
         let r = big_button(ui, Icon::BackgroundStyles, "Background\nStyles", true);
         egui::Popup::menu(&r).show(|ui| {
             egui::Grid::new("bgstyles").show(ui, |ui| {
@@ -2420,3 +2430,7 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+#[cfg(test)]
+#[path = "effects_tests.rs"]
+mod effects_tests;
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..1ba7fbe6 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (command registry 227; dialogs stay 27; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -20,7 +20,7 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
 | L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Command registry is 227 (`design.effects`). Dialogs stay 27. The test-count line stays 504 |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..48f3b262 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; checklist row stays P so breadth stays 79%; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Design ▸ Effects applies a named effect scheme. The checklist row stays P, so breadth stays 79%. Dialogs stay 27 |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..d0669488 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; percentages unchanged; previous: hours to ~95% per audience, ready ~55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -183,7 +183,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Files (commands) | 4 | 69% | ~50% | see file formats | Print, reuse slides, passwords, legacy and macro formats | [file-format-parity.md](file-format-parity.md) |
 | Slides and sections | 6 | 90% | ~85% | 3–5 | Zoom (summary/section/slide), copying slides between decks keeps formatting only partly | [parity-checklist.md](parity-checklist.md) |
 | Views | 4 | 90% | ~80% | 3–6 | Snap to grid and grid options, New Window | [ui-parity.md](ui-parity.md) |
-| Masters and themes | 7 | 85% | ~70% | 8–14 | Notes and Handout masters, theme variants, `.thmx`, effect schemes | [parity-checklist.md](parity-checklist.md) |
+| Masters and themes | 7 | 85% | ~70% | 8–14 | Notes and Handout masters, theme variants, `.thmx` | [parity-checklist.md](parity-checklist.md) |
 | Shapes | 7 | 86% | ~75% | 8–14 | Edit points, text warp, WordArt depth | [ui-parity.md](ui-parity.md) |
 | Format (fill, line, effects) | 6 | 81% | ~65% | 8–14 | Format Shape pane depth, bevel and 3-D, picture/texture fill options | [ui-parity.md](ui-parity.md) |
 | Arrange | 3 | 100% | ~90% | 1–2 | Align to slide vs selected as a menu choice, More Rotation Options | [ui-parity.md](ui-parity.md) |
@@ -211,6 +211,7 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   inheritance (slide → layout → master → theme), sections, notes, comments, custom shows,
   header/footer fields, embedded media, unlimited undo on shared slide snapshots.
 - **Themes:** 8 original themes with colour and font schemes, custom colours and fonts,
+  effect schemes (Design ▸ Effects: DeckCraft, Soft, Crisp, Lift, Glow, Plain),
   backgrounds (solid, gradient, picture, pattern), slide size presets.
 - **Shapes:** ~180 preset geometries with adjustment handles, text boxes, pictures (crop,
   corrections, animated GIFs that play and pause), tables with styles, charts (column, bar, line,
@@ -239,8 +240,8 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 226 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-  and MCP.
+- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
+  and MCP. The menu-bar measurement and the d556ff9 snapshot still count 226.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
 
@@ -276,6 +277,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Design ▸ Effects noted under what works today. Percentages stay 79% / ~60% / ~55%. The d556ff9 snapshot and the menu measurement stay at 226 commands; the live registry is 227 |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..5f190376 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,8 +1,8 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -64,6 +64,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
 | Design Ideas (Designer) | yes (cloud) | no |
+| Design ▸ Effects | named theme effect schemes | DeckCraft, Soft, Crisp, Lift, Glow and Plain (`design.effects`); colours and fonts stay |
 | Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
@@ -148,6 +149,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Design ▸ Effects applies a named effect scheme (fills, lines and effects). Not a new dialog; dialogs stay 27 |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 8bbea22f745cd084a8c7eb586b39485f639e8007 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:26:15 +0300
Subject: [PATCH 296/376] Media: refuse MP4s whose sample tables overrun the
 file before symphonia reserves memory for them

---
 ATTRIBUTION.md                                |   1 +
 crates/media/src/audio.rs                     |   1 +
 crates/media/src/lib.rs                       |   1 +
 crates/media/src/mp4guard.rs                  |  76 ++++++++++++++++++
 crates/media/src/probe.rs                     |   3 +
 crates/media/tests/decode.rs                  |  15 ++++
 .../tests/fixtures/damaged/stsc-count.m4a     | Bin 0 -> 5327 bytes
 .../tests/fixtures/damaged/stsz-size.m4a      | Bin 0 -> 5324 bytes
 8 files changed, 97 insertions(+)
 create mode 100644 crates/media/src/mp4guard.rs
 create mode 100644 crates/media/tests/fixtures/damaged/stsc-count.m4a
 create mode 100644 crates/media/tests/fixtures/damaged/stsz-size.m4a

diff --git a/ATTRIBUTION.md b/ATTRIBUTION.md
index 9ca8e5e8..31ed7495 100644
--- a/ATTRIBUTION.md
+++ b/ATTRIBUTION.md
@@ -26,6 +26,7 @@ deck and UI icons are original work of the DeckCraft contributors (drawn or gene
 | `docs/images/editor.png`, `docs/images/shape-format.png`, `docs/images/format-pane.png`, `docs/images/slide-sorter.png`, `docs/images/dark-mode.png`, `docs/images/sample-deck.png` | DeckCraft contributors | Screenshots of DeckCraft and slides rendered by `deckcraft-cli` from the built-in sample deck (original content; Inter font, OFL-1.1) | MIT OR Apache-2.0 | README screenshots |
 | `crates/media/tests/fixtures/tone*` (`tone.mp3`, `.m4a`, `.aac`, `.ogg`, `.opus`, `.flac`, `.wma`, `tone-alac.m4a`) | DeckCraft contributors | synthesised 0.5 s 440 Hz sine, encoded by `crates/media/tests/fixtures/make.sh` (ffmpeg as the encoder only) | CC0-1.0 | Audio decoding tests |
 | `crates/media/tests/fixtures/clip-*` (`clip-h264.mp4`, `clip-h264.mov`, `clip-hevc.mp4`, `clip-vp9.webm`, `clip-av1.mkv`) | DeckCraft contributors | 6 frames of a colour gradient generated by `make.sh` (python3), encoded by ffmpeg (x264 / x265 / libvpx / SVT-AV1 as encoders only) | CC0-1.0 | Video decoding tests |
+| `crates/media/tests/fixtures/damaged/*` (`stsc-count.m4a`, `stsz-size.m4a`) | DeckCraft contributors | `tone.m4a` above with bytes changed by a mutation fuzzer | CC0-1.0 | Damaged MP4 sample tables must not abort |
 | `crates/media/tests/fixtures/make.sh` | DeckCraft contributors | this repository | MIT OR Apache-2.0 | Regenerates the media fixtures |
 | `crates/render/tests/fixtures/colr-squares.ttf` | DeckCraft contributors | two squares as a COLRv0/CPAL test font, built by `make_colr_font.py` (fontTools as the builder only) | CC0-1.0 | Colour glyph rendering tests |
 | `crates/fonts/tests/fixtures/legacy-semibold.ttf` | DeckCraft contributors | a one-glyph Semibold face named like Segoe UI Semibold (its Windows family differs from the typographic one), built by `make_legacy_font.py` (fontTools as the builder only) | CC0-1.0 | Font lookup by Windows family name tests |
diff --git a/crates/media/src/audio.rs b/crates/media/src/audio.rs
index 80ad66a4..96ab9b79 100644
--- a/crates/media/src/audio.rs
+++ b/crates/media/src/audio.rs
@@ -77,6 +77,7 @@ pub fn decode(bytes: &Bytes) -> Result<Pcm> {
             Some(r) => r,
             None => decode_symphonia(bytes, "mkv"),
         },
+        Container::Mp4 if !crate::mp4guard::tables_fit(bytes) => Err(MediaError::Corrupt("the MP4's sample tables do not fit the file".into())),
         c => decode_symphonia(bytes, c.name()),
     }
 }
diff --git a/crates/media/src/lib.rs b/crates/media/src/lib.rs
index d31b5d61..95150868 100644
--- a/crates/media/src/lib.rs
+++ b/crates/media/src/lib.rs
@@ -19,6 +19,7 @@
 pub mod audio;
 pub mod clip;
 pub mod feed;
+mod mp4guard;
 pub mod player;
 pub mod probe;
 pub mod video;
diff --git a/crates/media/src/mp4guard.rs b/crates/media/src/mp4guard.rs
new file mode 100644
index 00000000..ff8e8613
--- /dev/null
+++ b/crates/media/src/mp4guard.rs
@@ -0,0 +1,76 @@
+//! Checks an MP4's box tree before symphonia reads it. Symphonia's MP4 reader reserves memory
+//! from the entry counts in the sample tables (and reads each sample whole at its `stsz` size)
+//! without checking them against the file, so a damaged count asks for gigabytes and the process
+//! aborts — an allocation failure cannot be caught. A file passes when every box fits inside its
+//! parent, every table's entries fit inside its box and every sample fits inside the file.
+
+/// Boxes whose payload is a sequence of boxes.
+const CONTAINERS: [&[u8; 4]; 11] = [b"moov", b"trak", b"mdia", b"minf", b"stbl", b"edts", b"dinf", b"udta", b"mvex", b"moof", b"traf"];
+
+/// Whether symphonia can be given `b` (an MP4) without a damaged size reaching an allocation.
+pub(crate) fn tables_fit(b: &[u8]) -> bool {
+    boxes_fit(b, b.len() as u64, 0)
+}
+
+fn be32(b: &[u8], at: usize) -> Option<u64> {
+    b.get(at..at.checked_add(4)?).map(|s| u32::from_be_bytes([s[0], s[1], s[2], s[3]]) as u64)
+}
+
+fn boxes_fit(b: &[u8], file_len: u64, depth: u32) -> bool {
+    if depth > 16 {
+        return false;
+    }
+    let mut at = 0usize;
+    while b.len() - at >= 8 {
+        let Some(size32) = be32(b, at) else { return false };
+        let kind = &b[at + 4..at + 8];
+        let (header, size) = match size32 {
+            0 => (8, (b.len() - at) as u64),
+            1 => match b.get(at + 8..at + 16) {
+                Some(s) => (16, u64::from_be_bytes(s.try_into().unwrap_or_default())),
+                None => return false,
+            },
+            n => (8, n),
+        };
+        if size < header as u64 || size > (b.len() - at) as u64 {
+            // A box that runs past the end of the file is fine at the top level (the file was cut
+            // short; symphonia stops there), but never inside a parent.
+            return depth == 0 && !matches!(kind, b"moov" | b"moof");
+        }
+        let body = &b[at + header..at + size as usize];
+        let ok = if CONTAINERS.iter().any(|c| c.as_slice() == kind) {
+            boxes_fit(body, file_len, depth + 1)
+        } else if kind == b"meta" {
+            // ISO `meta` is a full box (4 bytes of version and flags first); QuickTime's is not.
+            let skip = if be32(body, 0) == Some(0) { 4 } else { 0 };
+            boxes_fit(&body[skip.min(body.len())..], file_len, depth + 1)
+        } else {
+            table_fits(kind, body, file_len)
+        };
+        if !ok {
+            return false;
+        }
+        at += size as usize;
+    }
+    true
+}
+
+/// A sample table (a full box: version and flags, then a count and that many entries).
+fn table_fits(kind: &[u8], body: &[u8], file_len: u64) -> bool {
+    let entry = match kind {
+        b"stts" | b"ctts" | b"co64" => 8,
+        b"stsc" => 12,
+        b"stco" | b"stss" => 4,
+        b"stsz" => {
+            let (Some(size), Some(count)) = (be32(body, 4), be32(body, 8)) else { return false };
+            if size != 0 {
+                return size <= file_len;
+            }
+            let Some(entries) = body.get(12..) else { return false };
+            return count <= entries.len() as u64 / 4
+                && entries.as_chunks::<4>().0.iter().take(count as usize).all(|s| u32::from_be_bytes(*s) as u64 <= file_len);
+        }
+        _ => return true,
+    };
+    be32(body, 4).is_some_and(|count| count <= body.len().saturating_sub(8) as u64 / entry)
+}
diff --git a/crates/media/src/probe.rs b/crates/media/src/probe.rs
index 80a8a380..bc33eb17 100644
--- a/crates/media/src/probe.rs
+++ b/crates/media/src/probe.rs
@@ -58,6 +58,9 @@ pub fn probe(bytes: &Bytes) -> Result<MediaInfo> {
     };
     if info.audio.is_none() && info.video.is_none() || info.audio.as_ref().is_some_and(|a| a.sample_rate == 0) {
         // Plain audio files (and anything our demuxers didn't describe): symphonia's probe.
+        if c == Container::Mp4 && !crate::mp4guard::tables_fit(bytes) {
+            return Err(MediaError::Corrupt("the MP4's sample tables do not fit the file".into()));
+        }
         let (codec, rate, channels, frames) =
             crate::audio::probe_symphonia(bytes, c.name()).ok_or_else(|| MediaError::Unsupported("this kind of media file".into()))?;
         info.audio = Some(AudioInfo { codec: codec_label(&codec), sample_rate: rate, channels, decodable: true });
diff --git a/crates/media/tests/decode.rs b/crates/media/tests/decode.rs
index b3179445..b064a7e5 100644
--- a/crates/media/tests/decode.rs
+++ b/crates/media/tests/decode.rs
@@ -325,3 +325,18 @@ fn player_plays_decoded_audio_through_the_mixer() {
     assert!((rms - 0.0884 * 0.5).abs() < 0.005, "{rms}");
     assert!((p.status(1).map(|s| s.position).unwrap_or(0.0) - 0.1).abs() < 1e-6);
 }
+
+/// MP4s whose sample tables were damaged by a mutation fuzzer (from `tone.m4a`, so CC0 like it):
+/// one claims billions of `stsc` entries, one a 4 GB sample. Symphonia reserved that much memory
+/// up front and the process aborted; now they are corrupt files.
+#[test]
+fn mp4_sample_tables_that_overrun_the_file_are_corrupt() {
+    for name in ["damaged/stsc-count.m4a", "damaged/stsz-size.m4a"] {
+        let b = fixture(name);
+        assert!(matches!(audio::decode(&b), Err(MediaError::Corrupt(_))), "{name}");
+        let _ = probe::probe(&b);
+    }
+    for name in ["tone.m4a", "tone-alac.m4a", "clip-h264.mp4", "clip-h264.mov", "clip-hevc.mp4"] {
+        assert!(audio::decode(&fixture(name)).is_ok() || name.starts_with("clip"), "{name} still decodes");
+    }
+}
diff --git a/crates/media/tests/fixtures/damaged/stsc-count.m4a b/crates/media/tests/fixtures/damaged/stsc-count.m4a
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diff --git a/crates/media/tests/fixtures/damaged/stsz-size.m4a b/crates/media/tests/fixtures/damaged/stsz-size.m4a
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HcmV?d00001


From ce3725a5c828715982c899f69690663974c0839c Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:37:15 +0300
Subject: [PATCH 297/376] PPTX: literal CR LF and CR in XML read as LF; line
 feeds in run text read as line breaks

---
 crates/pptx/src/read/dml.rs    |  4 +--
 crates/pptx/src/xml.rs         | 17 +++++++++--
 crates/pptx/tests/roundtrip.rs | 53 ++++++++++++++++++++++++++++++++++
 3 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/crates/pptx/src/read/dml.rs b/crates/pptx/src/read/dml.rs
index 0aee935c..527d0a2a 100644
--- a/crates/pptx/src/read/dml.rs
+++ b/crates/pptx/src/read/dml.rs
@@ -552,8 +552,8 @@ pub fn paragraph(imp: &mut Imp, part: &Part, p: &El) -> Paragraph {
             "r" => {
                 let props = e.child("rPr").map(|r| rpr(imp, part, r)).unwrap_or_default();
                 let text: String = e.child("t").map(|t| t.text()).unwrap_or_default();
-                // Vertical tab inside text is a soft break in some writers.
-                for (i, piece) in text.split('\u{b}').enumerate() {
+                // A vertical tab or line feed inside text is a line break, as it lays out and as export writes it.
+                for (i, piece) in text.split(['\u{b}', '\n']).enumerate() {
                     if i > 0 {
                         para.runs.push(Run { text: String::new(), props: props.clone(), kind: RunKind::Break });
                     }
diff --git a/crates/pptx/src/xml.rs b/crates/pptx/src/xml.rs
index 60a94817..e51e4cbc 100644
--- a/crates/pptx/src/xml.rs
+++ b/crates/pptx/src/xml.rs
@@ -282,13 +282,13 @@ pub fn parse(bytes: &[u8]) -> Result<Doc, PptxError> {
             Event::Text(t) => {
                 if let Some(p) = stack.last_mut() {
                     let s = t.decode().map(|c| c.into_owned()).unwrap_or_default();
-                    push_text(p, &s);
+                    push_text(p, &line_ends(s));
                 }
             }
             Event::CData(t) => {
                 if let Some(p) = stack.last_mut() {
                     let s = String::from_utf8_lossy(&t).into_owned();
-                    push_text(p, &s);
+                    push_text(p, &line_ends(s));
                 }
             }
             Event::GeneralRef(r) => {
@@ -324,6 +324,12 @@ pub fn parse(bytes: &[u8]) -> Result<Doc, PptxError> {
     Ok(Doc { root })
 }
 
+/// XML 1.0 §2.11: a literal CR LF or lone CR in the document reads as LF. A `&#13;` reference is
+/// not literal and reaches `push_text` through `GeneralRef`, so it stays a CR.
+fn line_ends(s: String) -> String {
+    if s.contains('\r') { s.replace("\r\n", "\n").replace('\r', "\n") } else { s }
+}
+
 fn push_text(p: &mut El, s: &str) {
     if s.is_empty() {
         return;
@@ -504,6 +510,13 @@ impl W {
 mod tests {
     use super::*;
 
+    #[test]
+    fn literal_cr_lf_and_lone_cr_read_as_lf_but_char_ref_stays() {
+        let d = parse(b"<a:p><a:t>one\r\ntwo\rthree&#13;four</a:t><a:t><![CDATA[x\r\ny]]></a:t></a:p>").expect("parse");
+        let t: Vec<String> = d.root.children_named("t").map(|t| t.text()).collect();
+        assert_eq!(t, vec!["one\ntwo\nthree\rfour".to_string(), "x\ny".to_string()]);
+    }
+
     #[test]
     fn parse_basic_and_entities() {
         let d = parse(b"<?xml version=\"1.0\"?><a:p xmlns:a=\"x\"><a:r><a:t>A &amp; B &#x41; &lt;</a:t></a:r><a:x r:id=\"rId1\" id=\"5\"/></a:p>")
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..1b2704e8 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,56 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+/// Replace `from` with `to` in every slide part of an exported deck.
+fn patch_slides(bytes: Vec<u8>, from: &str, to: &str) -> Vec<u8> {
+    use std::io::{Read, Write};
+    let mut z = zip::ZipArchive::new(std::io::Cursor::new(bytes)).expect("zip");
+    let mut out = zip::ZipWriter::new(std::io::Cursor::new(Vec::new()));
+    for i in 0..z.len() {
+        let mut f = z.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        let mut data = vec![];
+        f.read_to_end(&mut data).expect("read");
+        if name.starts_with("ppt/slides/slide") && name.ends_with(".xml") {
+            data = String::from_utf8(data).expect("utf8").replace(from, to).into_bytes();
+        }
+        out.start_file(name, zip::write::SimpleFileOptions::default()).expect("start");
+        out.write_all(&data).expect("write");
+    }
+    out.finish().expect("finish").into_inner()
+}
+
+fn runs_of(p: &Presentation, needle: &str) -> Vec<(RunKind, String)> {
+    for s in &p.slides {
+        for sh in &s.shapes {
+            let Some(t) = &sh.text else { continue };
+            for para in &t.paragraphs {
+                if para.runs.iter().any(|r| r.text.contains(needle)) {
+                    return para.runs.iter().map(|r| (r.kind.clone(), r.text.clone())).collect();
+                }
+            }
+        }
+    }
+    panic!("no paragraph with {needle}");
+}
+
+#[test]
+fn literal_line_ends_in_run_text_read_as_breaks_and_survive_save() {
+    let mut p = defaults::new_presentation(None);
+    let mut s = shape(&mut p, "Code", 10.0, 10.0, 400.0, 100.0);
+    s.text = Some(TextBody::from_text("CRLFHERE"));
+    let first = p.slides[0].id;
+    p.slide_mut(first).expect("slide").shapes.push(s);
+    let bytes = patch_slides(deckcraft_pptx::export(&p).expect("export"), "CRLFHERE", "one\r\n   two\rthree");
+    let a = deckcraft_pptx::import(&bytes).expect("import");
+    let want = vec![
+        (RunKind::Text, "one".to_string()),
+        (RunKind::Break, String::new()),
+        (RunKind::Text, "   two".to_string()),
+        (RunKind::Break, String::new()),
+        (RunKind::Text, "three".to_string()),
+    ];
+    assert_eq!(runs_of(&a, "one"), want);
+    assert_eq!(runs_of(&round(&a), "one"), want, "save and reopen keep the runs");
+}

From 5d9f47c81a1ca099dec563c23e37dd685bb1f9b7 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:37:49 +0300
Subject: [PATCH 298/376] Clipboard: rich text and pictures for other apps

Copy puts HTML on the pasteboard with the same plain words, so Pages keeps
bold, italic and underline, and a paste of that HTML keeps them here. A
shape with no text copies out as a picture.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                        |   4 +-
 apps/deckcraft/src/main.rs        |  13 +-
 apps/deckcraft/src/pasteboard.rs  |  77 +++++++
 crates/engine/src/cmd/edit.rs     |  79 ++++++-
 crates/engine/src/cmd/mod.rs      |   1 +
 crates/engine/src/cmd/richclip.rs | 346 ++++++++++++++++++++++++++++++
 crates/engine/src/tests.rs        |  56 +++++
 crates/render/src/lib.rs          |  43 ++++
 crates/render/src/tests.rs        |  16 ++
 crates/ui-egui/src/lib.rs         | 154 +++++++++++--
 docs/ui-parity.md                 |   7 +-
 11 files changed, 763 insertions(+), 33 deletions(-)
 create mode 100644 apps/deckcraft/src/pasteboard.rs
 create mode 100644 crates/engine/src/cmd/richclip.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..0fe66975 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: copy and paste rich text and pictures with other apps; previous: hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Copy and paste with other apps: bold, italic and underline travel as HTML (Pages keeps them), and a shape with no text copies out as a picture |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: copy and paste rich text and pictures with other apps |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/apps/deckcraft/src/main.rs b/apps/deckcraft/src/main.rs
index 7b5e48bb..5173ff87 100644
--- a/apps/deckcraft/src/main.rs
+++ b/apps/deckcraft/src/main.rs
@@ -17,6 +17,8 @@ mod control_server;
 #[cfg(any(target_os = "windows", test))]
 mod graphics;
 mod logging;
+#[cfg(not(target_arch = "wasm32"))]
+mod pasteboard;
 
 use deckcraft_engine::Session;
 use deckcraft_ui_egui::{Services, SlideApp};
@@ -111,14 +113,9 @@ fn services() -> Services {
         pick_save: Some(Box::new(|name: &str| rfd::FileDialog::new().set_file_name(name).save_file().map(|p| p.to_string_lossy().to_string()))),
         read: Some(Box::new(|p: &str| std::fs::read(p).map_err(|e| e.to_string()))),
         write: Some(Box::new(|p: &str, b: &[u8]| std::fs::write(p, b).map_err(|e| e.to_string()))),
-        clipboard_image: Some(Box::new(|| {
-            let mut cb = arboard::Clipboard::new().ok()?;
-            let img = cb.get_image().ok()?;
-            let rgba = image::RgbaImage::from_raw(img.width as u32, img.height as u32, img.bytes.into_owned())?;
-            let mut out = Vec::new();
-            rgba.write_to(&mut std::io::Cursor::new(&mut out), image::ImageFormat::Png).ok()?;
-            Some(out)
-        })),
+        clipboard_image: Some(Box::new(pasteboard::image_png)),
+        clipboard_html: Some(Box::new(pasteboard::html)),
+        clipboard_set_html: Some(Box::new(pasteboard::set_html)),
         // Media is mixed and clocked by the output device; `DECKCRAFT_NO_AUDIO` plays silently.
         audio_out: std::env::var_os("DECKCRAFT_NO_AUDIO")
             .is_none()
diff --git a/apps/deckcraft/src/pasteboard.rs b/apps/deckcraft/src/pasteboard.rs
new file mode 100644
index 00000000..98626295
--- /dev/null
+++ b/apps/deckcraft/src/pasteboard.rs
@@ -0,0 +1,77 @@
+//! System pasteboard: HTML rich text, and a picture (TIFF on macOS, via arboard).
+//!
+//! Pages keeps bold, italic and underline when the pasteboard carries HTML plus the same plain
+//! words. A shape with no text is copied as an image by the UI; this module only reads a picture
+//! back (Keynote's TIFF) as PNG bytes.
+
+/// HTML currently on the pasteboard, when there is some.
+pub fn html() -> Option<String> {
+    let mut cb = arboard::Clipboard::new().ok()?;
+    let html = cb.get().html().ok()?;
+    let html = html.trim();
+    if html.is_empty() { None } else { Some(html.to_string()) }
+}
+
+/// Write `html` and the plain alternative `text`. `false` when the pasteboard refuses it.
+pub fn set_html(html: &str, text: &str) -> bool {
+    let Ok(mut cb) = arboard::Clipboard::new() else { return false };
+    cb.set_html(html, Some(text)).is_ok()
+}
+
+/// The pasteboard picture as PNG bytes (TIFF on macOS is decoded by arboard).
+pub fn image_png() -> Option<Vec<u8>> {
+    let mut cb = arboard::Clipboard::new().ok()?;
+    let img = cb.get_image().ok()?;
+    let width = u32::try_from(img.width).ok()?;
+    let height = u32::try_from(img.height).ok()?;
+    let rgba = image::RgbaImage::from_raw(width, height, img.bytes.into_owned())?;
+    let mut out = Vec::new();
+    rgba.write_to(&mut std::io::Cursor::new(&mut out), image::ImageFormat::Png).ok()?;
+    Some(out)
+}
+
+#[cfg(test)]
+mod tests {
+    use std::borrow::Cow;
+
+    /// Puts HTML and a 1×1 picture on the macOS pasteboard and reads them back.
+    /// Restores whatever plain text was there. Other platforms return immediately.
+    #[test]
+    fn html_and_a_picture_round_trip_on_macos() {
+        if !cfg!(target_os = "macos") {
+            return;
+        }
+        let previous = arboard::Clipboard::new().ok().and_then(|mut cb| cb.get_text().ok());
+        let _restore = Restore(previous);
+        assert!(super::set_html("<b>DeckCraft</b>", "DeckCraft"), "set html");
+        let html = super::html().unwrap_or_default();
+        assert!(html.contains("<b>") || html.contains("<B>"), "{html}");
+        let text = arboard::Clipboard::new().ok().and_then(|mut cb| cb.get_text().ok()).unwrap_or_default();
+        assert_eq!(text, "DeckCraft");
+        let mut cb = arboard::Clipboard::new().expect("pasteboard");
+        let img = arboard::ImageData { width: 1, height: 1, bytes: Cow::Owned(vec![255, 0, 0, 255]) };
+        cb.set_image(img).expect("set image");
+        drop(cb);
+        let png = super::image_png().expect("png");
+        let decoded = image::load_from_memory(&png).expect("decode").to_rgba8();
+        let p = decoded.get_pixel(0, 0);
+        assert!(p[0] > 200 && p[1] < 40 && p[3] > 200, "{p:?}");
+    }
+
+    /// Puts the previous plain text back, including when the test fails halfway.
+    struct Restore(Option<String>);
+
+    impl Drop for Restore {
+        fn drop(&mut self) {
+            let Ok(mut cb) = arboard::Clipboard::new() else { return };
+            match self.0.take() {
+                Some(t) => {
+                    let _ = cb.set_text(t);
+                }
+                None => {
+                    let _ = cb.clear();
+                }
+            }
+        }
+    }
+}
diff --git a/crates/engine/src/cmd/edit.rs b/crates/engine/src/cmd/edit.rs
index 30437b15..d4108705 100644
--- a/crates/engine/src/cmd/edit.rs
+++ b/crates/engine/src/cmd/edit.rs
@@ -2,6 +2,7 @@
 
 use std::sync::Arc;
 
+use deckcraft_model::text::TextBody;
 use deckcraft_model::{MediaId, Shape, ShapeId, Slide, SlideId};
 use serde_json::{Value, json};
 
@@ -12,9 +13,17 @@ pub fn specs() -> Vec<CommandSpec> {
     vec![
         cmd!(noundo "edit.undo", "Undo", ["Edit"], Some("Cmd+Z"), "{}", can_undo, undo),
         cmd!(noundo "edit.redo", "Redo", ["Edit"], Some("Cmd+Y"), "{}", can_redo, redo),
-        cmd!("edit.cut", "Cut", ["Home", "Clipboard"], Some("Cmd+X"), "{scope?: slides}", has_doc, cut),
-        cmd!(noundo "edit.copy", "Copy", ["Home", "Clipboard"], Some("Cmd+C"), "{scope?: slides} → {text}", has_doc, copy),
-        cmd!("edit.paste", "Paste", ["Home", "Clipboard"], Some("Cmd+V"), "{text?: plain text to paste, scope?: slides}", has_doc, paste),
+        cmd!("edit.cut", "Cut", ["Home", "Clipboard"], Some("Cmd+X"), "{scope?: slides} → {text, html?}", has_doc, cut),
+        cmd!(noundo "edit.copy", "Copy", ["Home", "Clipboard"], Some("Cmd+C"), "{scope?: slides} → {text, html?}", has_doc, copy),
+        cmd!(
+            "edit.paste",
+            "Paste",
+            ["Home", "Clipboard"],
+            Some("Cmd+V"),
+            "{text?: plain text to paste, html?: rich text from another app, scope?: slides}",
+            has_doc,
+            paste
+        ),
         cmd!("edit.pasteText", "Paste and Match Formatting", ["Edit"], Some("Cmd+Shift+V"), "{text?}", has_doc, paste_text),
         cmd!("edit.duplicate", "Duplicate", ["Edit"], Some("Cmd+D"), "{ids?}", has_selection, duplicate),
         cmd!("edit.delete", "Delete", ["Edit"], Some("Delete"), "{ids?, scope?: slides}", has_doc, delete),
@@ -114,15 +123,41 @@ fn copy_inner(s: &mut Session, p: &Value) -> Result<String> {
     Ok(plain)
 }
 
+fn copying_caret(s: &Session) -> bool {
+    s.active().is_some_and(|d| d.selection.text.as_ref().is_some_and(|t| !t.is_range()))
+}
+
 fn copy(s: &mut Session, p: &Value) -> Result<Value> {
+    // A caret copies nothing; the previous clipboard must not leak into this answer.
+    let caret = copying_caret(s);
     let t = copy_inner(s, p)?;
-    Ok(json!({"text": t}))
+    let html = if caret { String::new() } else { copied_html(s) };
+    Ok(json!({"text": t, "html": html}))
+}
+
+/// HTML for what was just copied, when it is text (a selection, or the text on the copied shapes).
+fn copied_html(s: &Session) -> String {
+    if let Some(body) = &s.clipboard.text {
+        return richclip::body_to_html(body);
+    }
+    let mut paragraphs = Vec::new();
+    for sh in &s.clipboard.shapes {
+        if let Some(t) = &sh.text {
+            paragraphs.extend(t.paragraphs.clone());
+        }
+    }
+    if paragraphs.is_empty() {
+        return String::new();
+    }
+    richclip::body_to_html(&TextBody { paragraphs, ..Default::default() })
 }
 
 fn cut(s: &mut Session, p: &Value) -> Result<Value> {
+    let caret = copying_caret(s);
     let t = copy_inner(s, p)?;
+    let html = if caret { String::new() } else { copied_html(s) };
     delete(s, p)?;
-    Ok(json!({"text": t}))
+    Ok(json!({"text": t, "html": html}))
 }
 
 /// Give pasted shapes fresh ids (groups included) and map connector ends.
@@ -157,9 +192,16 @@ fn bring_media(doc: &mut deckcraft_model::Presentation, media: &[deckcraft_model
 
 fn paste(s: &mut Session, p: &Value) -> Result<Value> {
     // External plain text (from the system clipboard) wins when given and differs from ours.
+    // HTML from Pages or Keynote keeps bold, italic and underline when it says the same words.
     if let Some(t) = str_param(p, "text")
         && t != s.clipboard.plain
     {
+        if let Some(html) = str_param(p, "html")
+            && let Some(body) = richclip::html_to_body(html)
+            && richclip::same_words(&body.text(), t)
+        {
+            return paste_external_body(s, &body);
+        }
         return paste_plain(s, t);
     }
     let editing = s.doc()?.selection.text.is_some();
@@ -228,6 +270,33 @@ fn paste(s: &mut Session, p: &Value) -> Result<Value> {
     ok()
 }
 
+fn paste_external_body(s: &mut Session, body: &TextBody) -> Result<Value> {
+    if s.doc()?.selection.text.is_some() {
+        return super::text::paste_body(s, body);
+    }
+    let plain = body.text();
+    let st = s.doc()?;
+    let size = st.doc.slide_size;
+    let rect = [size.width * 0.25, size.height * 0.4, size.width * 0.5, 40.0];
+    let made = s.execute("insert.textBox", &json!({"rect": rect, "text": plain}))?;
+    let raw = made.get("id").and_then(Value::as_u64).ok_or_else(|| bad("edit.paste", "no text box"))?;
+    let id = u32::try_from(raw).map_err(|_| bad("edit.paste", "no text box"))?;
+    let body = body.clone();
+    s.edit(|doc, sel| {
+        let list = crate::shapes_mut(doc, sel).ok_or_else(|| bad("edit.paste", "no slide"))?;
+        let sh = deckcraft_model::find_shape_mut(list, ShapeId(id)).ok_or_else(|| bad("edit.paste", "no text box"))?;
+        if let Some(t) = sh.text.as_mut() {
+            let (wrap, autofit) = (t.body.wrap, t.body.autofit);
+            *t = body.clone();
+            t.body.wrap = wrap;
+            t.body.autofit = autofit;
+        }
+        sel.shapes = vec![ShapeId(id)];
+        sel.text = None;
+        Ok(json!({"id": id}))
+    })
+}
+
 fn paste_plain(s: &mut Session, text: &str) -> Result<Value> {
     if s.doc()?.selection.text.is_some() {
         return super::text::insert_text(s, text, None);
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index ce909b02..98d26b47 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -11,6 +11,7 @@ pub mod inspect;
 pub mod media;
 pub mod merge;
 pub mod review;
+mod richclip;
 pub mod selection;
 pub mod shape;
 pub mod slide;
diff --git a/crates/engine/src/cmd/richclip.rs b/crates/engine/src/cmd/richclip.rs
new file mode 100644
index 00000000..69f70686
--- /dev/null
+++ b/crates/engine/src/cmd/richclip.rs
@@ -0,0 +1,346 @@
+//! Rich text on the system clipboard, as HTML.
+//!
+//! Pages and Keynote put copied text on the pasteboard as HTML (and plain text). DeckCraft writes
+//! the same pair when it copies, and reads it back on paste: bold, italic and underline survive.
+//! Anything else in the markup is skipped. A hostile fragment is capped, never executed.
+
+use deckcraft_model::text::{Paragraph, Run, RunProps, TextBody};
+
+const MAX_HTML: usize = 1 << 20;
+const MAX_PARAS: usize = 2_000;
+const MAX_RUNS: usize = 10_000;
+
+/// HTML for `body`: one `<p>` per paragraph, `<b>`, `<i>` and `<u>` for the formatting.
+pub fn body_to_html(body: &TextBody) -> String {
+    let mut out = String::new();
+    for (i, p) in body.paragraphs.iter().enumerate() {
+        if i > 0 {
+            out.push_str("<br>");
+        }
+        out.push_str("<p>");
+        for r in &p.runs {
+            let (open, close) = tags(&r.props);
+            out.push_str(&open);
+            match &r.kind {
+                deckcraft_model::text::RunKind::Break => out.push_str("<br>"),
+                _ => push_escaped(&mut out, &r.text),
+            }
+            out.push_str(&close);
+            if out.len() > MAX_HTML {
+                break;
+            }
+        }
+        out.push_str("</p>");
+    }
+    out
+}
+
+fn tags(props: &RunProps) -> (String, String) {
+    let mut open = String::new();
+    let mut close = String::new();
+    if props.bold == Some(true) {
+        open.push_str("<b>");
+        close.insert_str(0, "</b>");
+    }
+    if props.italic == Some(true) {
+        open.push_str("<i>");
+        close.insert_str(0, "</i>");
+    }
+    if props.underline.as_deref().is_some_and(|u| !u.eq_ignore_ascii_case("none")) {
+        open.push_str("<u>");
+        close.insert_str(0, "</u>");
+    }
+    (open, close)
+}
+
+fn push_escaped(out: &mut String, text: &str) {
+    for c in text.chars() {
+        match c {
+            '&' => out.push_str("&amp;"),
+            '<' => out.push_str("&lt;"),
+            '>' => out.push_str("&gt;"),
+            _ => out.push(c),
+        }
+    }
+}
+
+/// The formatted text of an HTML fragment, or `None` when it has no text.
+///
+/// Understands `<b>`, `<strong>`, `<i>`, `<em>`, `<u>`, `<br>`, paragraphs, and a `style` that
+/// says bold, italic or underline. Other tags are ignored. The result is capped.
+pub fn html_to_body(html: &str) -> Option<TextBody> {
+    if html.len() > MAX_HTML {
+        return None;
+    }
+    let bytes = html.as_bytes();
+    let mut i = 0;
+    let mut bold = 0i32;
+    let mut italic = 0i32;
+    let mut underline = 0i32;
+    let mut stack: Vec<(&'static str, i32, i32, i32)> = Vec::new();
+    let mut paragraphs: Vec<Paragraph> = vec![Paragraph::default()];
+    let mut runs = 0usize;
+    let mut skip = 0i32;
+    while i < bytes.len() && paragraphs.len() <= MAX_PARAS && runs <= MAX_RUNS {
+        if bytes[i] == b'<' {
+            let end = bytes[i + 1..].iter().position(|c| *c == b'>').map(|n| i + 1 + n).unwrap_or(bytes.len());
+            let raw = &html[i + 1..end];
+            i = (end + 1).min(bytes.len());
+            let token = raw.trim();
+            if token.starts_with('!') || token.starts_with('?') {
+                continue;
+            }
+            let closing = token.starts_with('/');
+            let name_src = token.trim_start_matches('/').trim();
+            let name_end = name_src.find(|c: char| c.is_whitespace() || c == '/' || c == '>').unwrap_or(name_src.len());
+            let name = name_src[..name_end].to_ascii_lowercase();
+            if name == "script" || name == "style" || name == "head" {
+                if closing {
+                    skip = (skip - 1).max(0);
+                } else if !token.ends_with('/') {
+                    skip += 1;
+                }
+                continue;
+            }
+            if skip > 0 {
+                continue;
+            }
+            if closing {
+                let kind = tag_kind(&name);
+                if !kind.is_empty()
+                    && let Some(pos) = stack.iter().rposition(|e| e.0 == kind)
+                {
+                    let (_, db, di, du) = stack[pos];
+                    bold -= db;
+                    italic -= di;
+                    underline -= du;
+                    stack.truncate(pos);
+                }
+                if is_block(&name) {
+                    new_para(&mut paragraphs);
+                }
+                continue;
+            }
+            if is_break(&name) {
+                new_para(&mut paragraphs);
+                continue;
+            }
+            let (db, di, du) = tag_style(&name, name_src);
+            if db + di + du > 0 {
+                bold += db;
+                italic += di;
+                underline += du;
+                if !token.ends_with('/') {
+                    stack.push((tag_kind(&name), db, di, du));
+                } else {
+                    bold -= db;
+                    italic -= di;
+                    underline -= du;
+                }
+            }
+            continue;
+        }
+        if skip > 0 {
+            i += 1;
+            continue;
+        }
+        let end = bytes[i..].iter().position(|c| *c == b'<').map(|n| i + n).unwrap_or(bytes.len());
+        let text = decode_text(&html[i..end]);
+        i = end;
+        if text.is_empty() {
+            continue;
+        }
+        push_run(&mut paragraphs, &mut runs, text, bold > 0, italic > 0, underline > 0);
+    }
+    while paragraphs.last().is_some_and(Paragraph::is_empty) && paragraphs.len() > 1 {
+        paragraphs.pop();
+    }
+    if paragraphs.iter().all(Paragraph::is_empty) {
+        return None;
+    }
+    for p in &mut paragraphs {
+        p.normalize();
+    }
+    Some(TextBody { paragraphs, ..Default::default() })
+}
+
+fn tag_kind(name: &str) -> &'static str {
+    match name {
+        "b" | "strong" => "b",
+        "i" | "em" => "i",
+        "u" => "u",
+        "span" | "font" => "span",
+        "p" | "div" | "li" | "h1" | "h2" | "h3" | "h4" | "h5" | "h6" => "block",
+        _ => "",
+    }
+}
+
+fn is_break(name: &str) -> bool {
+    name == "br" || name == "hr"
+}
+
+fn is_block(name: &str) -> bool {
+    matches!(name, "p" | "div" | "li" | "tr" | "h1" | "h2" | "h3" | "h4" | "h5" | "h6" | "blockquote")
+}
+
+fn tag_style(name: &str, src: &str) -> (i32, i32, i32) {
+    let mut bold = i32::from(name == "b" || name == "strong");
+    let mut italic = i32::from(name == "i" || name == "em");
+    let mut underline = i32::from(name == "u");
+    if let Some(style) = attr(src, "style") {
+        let s = style.to_ascii_lowercase();
+        if s.contains("font-weight:bold") || s.contains("font-weight: bold") || weight_bold(&s) {
+            bold = 1;
+        }
+        if s.contains("font-style:italic") || s.contains("font-style: italic") {
+            italic = 1;
+        }
+        if s.contains("text-decoration:underline")
+            || s.contains("text-decoration: underline")
+            || s.contains("text-decoration-line:underline")
+            || s.contains("text-decoration-line: underline")
+        {
+            underline = 1;
+        }
+    }
+    (bold, italic, underline)
+}
+
+fn weight_bold(style: &str) -> bool {
+    let Some(at) = style.find("font-weight") else { return false };
+    let rest = style[at + "font-weight".len()..].trim_start_matches(|c: char| c == ':' || c.is_whitespace());
+    rest.starts_with('6') || rest.starts_with('7') || rest.starts_with('8') || rest.starts_with('9')
+}
+
+fn attr<'a>(tag: &'a str, key: &str) -> Option<&'a str> {
+    let lower = tag.to_ascii_lowercase();
+    let at = lower.find(key)?;
+    let after = tag.get(at + key.len()..)?.trim_start();
+    let after = after.strip_prefix('=')?.trim_start();
+    let quote = after.chars().next()?;
+    if quote != '"' && quote != '\'' {
+        return None;
+    }
+    let rest = after.get(quote.len_utf8()..)?;
+    let end = rest.find(quote)?;
+    rest.get(..end)
+}
+
+fn new_para(paragraphs: &mut Vec<Paragraph>) {
+    if paragraphs.len() >= MAX_PARAS {
+        return;
+    }
+    if paragraphs.last().is_some_and(|p| !p.is_empty()) {
+        paragraphs.push(Paragraph::default());
+    }
+}
+
+fn push_run(paragraphs: &mut [Paragraph], runs: &mut usize, text: String, bold: bool, italic: bool, underline: bool) {
+    if *runs >= MAX_RUNS {
+        return;
+    }
+    let Some(p) = paragraphs.last_mut() else { return };
+    let mut props = RunProps::default();
+    if bold {
+        props.bold = Some(true);
+    }
+    if italic {
+        props.italic = Some(true);
+    }
+    if underline {
+        props.underline = Some("sng".into());
+    }
+    p.runs.push(Run::with(text, props));
+    *runs += 1;
+}
+
+fn decode_text(raw: &str) -> String {
+    let mut out = String::new();
+    let mut rest = raw;
+    while let Some(at) = rest.find('&') {
+        out.push_str(&rest[..at].replace(['\n', '\r'], ""));
+        rest = &rest[at..];
+        let Some(end) = rest.find(';') else {
+            out.push_str(&rest.replace(['\n', '\r'], ""));
+            break;
+        };
+        let entity = &rest[1..end];
+        rest = &rest[end + 1..];
+        match entity {
+            "amp" => out.push('&'),
+            "lt" => out.push('<'),
+            "gt" => out.push('>'),
+            "quot" => out.push('"'),
+            "apos" => out.push('\''),
+            "nbsp" => out.push(' '),
+            _ => {
+                let ch = entity.strip_prefix('#').and_then(numeric_char);
+                if let Some(c) = ch {
+                    out.push(c);
+                }
+            }
+        }
+    }
+    if !rest.is_empty() && !rest.starts_with('&') {
+        out.push_str(&rest.replace(['\n', '\r'], ""));
+    }
+    out
+}
+
+fn numeric_char(digits: &str) -> Option<char> {
+    let hex = digits.strip_prefix('x').or_else(|| digits.strip_prefix('X'));
+    let n = if let Some(hex) = hex { u32::from_str_radix(hex, 16).ok()? } else { digits.parse().ok()? };
+    char::from_u32(n).filter(|c| !c.is_control() || *c == '\n')
+}
+
+/// Do the HTML's words and the paste's plain text say the same thing?
+pub fn same_words(html_plain: &str, pasted: &str) -> bool {
+    let a = fold(html_plain);
+    let b = fold(pasted);
+    a == b
+}
+
+fn fold(s: &str) -> String {
+    s.replace("\r\n", "\n").replace('\r', "\n").replace('\u{00a0}', " ").trim_matches(['\n', ' ', '\t']).to_string()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn bold_italic_and_underline_round_trip() {
+        let mut body = TextBody::from_text("Hi there");
+        body.paragraphs[0].runs = vec![
+            Run::with("Hi", RunProps { bold: Some(true), ..Default::default() }),
+            Run::new(" "),
+            Run::with("there", RunProps { italic: Some(true), underline: Some("sng".into()), ..Default::default() }),
+        ];
+        let html = body_to_html(&body);
+        assert!(html.contains("<b>Hi</b>"), "{html}");
+        assert!(html.contains("<i><u>there</u></i>") || html.contains("<u><i>there</i></u>"), "{html}");
+        let back = html_to_body(&html).unwrap();
+        assert_eq!(back.text(), "Hi there");
+        assert_eq!(back.paragraphs[0].runs[0].props.bold, Some(true));
+        let last = back.paragraphs[0].runs.last().unwrap();
+        assert_eq!(last.props.italic, Some(true));
+        assert!(last.props.underline.is_some());
+    }
+
+    #[test]
+    fn pages_style_and_escapes() {
+        let html = "<html><head><style>p{}</style></head><body><p><span style=\"font-weight: bold\">A &amp; B</span></p><p><span style=\"font-style: italic\">C</span></p></body></html>";
+        let body = html_to_body(html).unwrap();
+        assert_eq!(body.text(), "A & B\nC");
+        assert_eq!(body.paragraphs[0].runs[0].props.bold, Some(true));
+        assert_eq!(body.paragraphs[1].runs[0].props.italic, Some(true));
+        assert!(same_words(&body.text(), "A & B\nC"));
+        assert!(!same_words(&body.text(), "other"));
+    }
+
+    #[test]
+    fn a_huge_fragment_is_refused() {
+        let html = "x".repeat(MAX_HTML + 1);
+        assert!(html_to_body(&html).is_none());
+    }
+}
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..57b66c09 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -93,6 +93,62 @@ fn clipboard_copy_paste_shapes_and_slides() {
     assert!(s.doc().unwrap().doc.validate().is_empty());
 }
 
+#[test]
+fn bold_copy_is_html_and_pages_html_pastes_bold() {
+    let mut s = session();
+    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
+    s.execute("text.edit", &json!({"id": title})).unwrap();
+    s.execute("text.insert", &json!({"text": "Hello"})).unwrap();
+    s.execute("text.selectAll", &json!({})).unwrap();
+    s.execute("format.bold", &json!({"on": true})).unwrap();
+    let v = s.execute("edit.copy", &json!({})).unwrap();
+    let html = v["html"].as_str().unwrap();
+    assert!(html.contains("<b>"), "{html}");
+    assert_eq!(v["text"], "Hello");
+    // The same plain words are our own clipboard, so a plainer HTML fragment is not reparsed.
+    s.execute("text.select", &json!({"anchor": [0, 5], "caret": [0, 5]})).unwrap();
+    s.execute("edit.paste", &json!({"text": "Hello", "html": "<p>Hello</p>"})).unwrap();
+    let body = s.doc().unwrap().shape(deckcraft_model::ShapeId(title)).unwrap().text.clone().unwrap();
+    assert_eq!(body.text(), "HelloHello");
+    assert!(body.paragraphs.iter().flat_map(|p| p.runs.iter()).all(|r| r.props.bold == Some(true)), "{body:?}");
+    s.execute("text.select", &json!({"anchor": [0, 10], "caret": [0, 10]})).unwrap();
+    let caret = s.execute("edit.copy", &json!({})).unwrap();
+    assert_eq!(caret["text"], "");
+    assert_eq!(caret["html"], "");
+
+    let mut ext = session();
+    ext.execute("edit.paste", &json!({"text": "Hello", "html": "<p style=\"font-weight: bold\">Hello</p>"})).unwrap();
+    let pasted = ext
+        .doc()
+        .unwrap()
+        .current_slide()
+        .unwrap()
+        .shapes
+        .iter()
+        .find(|sh| sh.text.as_ref().is_some_and(|t| t.text() == "Hello"))
+        .unwrap()
+        .text
+        .clone()
+        .unwrap();
+    assert_eq!(pasted.paragraphs[0].runs[0].props.bold, Some(true), "{pasted:?}");
+
+    let mut mismatched = session();
+    mismatched.execute("edit.paste", &json!({"text": "Hi", "html": "<b>Nope</b>"})).unwrap();
+    let plain = mismatched
+        .doc()
+        .unwrap()
+        .current_slide()
+        .unwrap()
+        .shapes
+        .iter()
+        .find(|sh| sh.text.as_ref().is_some_and(|t| t.text() == "Hi"))
+        .unwrap()
+        .text
+        .clone()
+        .unwrap();
+    assert_ne!(plain.paragraphs[0].runs[0].props.bold, Some(true));
+}
+
 #[test]
 fn group_ungroup_roundtrip_positions() {
     let mut s = session();
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..e9ac442e 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -2107,6 +2107,49 @@ fn draw_glyph_with(
     }
 }
 
+/// Render `ids` together onto a transparent canvas, in their slide positions (copy as a picture).
+pub fn render_shapes(pres: &Presentation, slide: &Slide, ids: &[ShapeId], scale: f64) -> Option<Image> {
+    if ids.is_empty() || !scale.is_finite() || scale <= 0.0 {
+        return None;
+    }
+    let rctx = Ctx::for_slide(pres, slide)?;
+    let mut items = Vec::new();
+    let mut bounds: Option<Rect> = None;
+    for id in ids.iter().take(256) {
+        let Some(s) = slide.shape(*id) else { continue };
+        let b = resolve::xfrm(&rctx, s).bounds();
+        if !b.width().is_finite() || !b.height().is_finite() || b.width() < 0.0 || b.height() < 0.0 {
+            continue;
+        }
+        bounds = Some(match bounds {
+            Some(u) => u.union(b),
+            None => b,
+        });
+        items.push(s);
+    }
+    let b = bounds?.inflate(8.0, 8.0);
+    if !(b.width() > 0.0 && b.height() > 0.0 && b.width().is_finite() && b.height().is_finite()) {
+        return None;
+    }
+    let fit = (2048.0 / b.width().max(b.height())).min(scale);
+    if !(fit.is_finite() && fit > 0.0) {
+        return None;
+    }
+    let w = (b.width() * fit).ceil().clamp(1.0, 2048.0) as u16;
+    let h = (b.height() * fit).ceil().clamp(1.0, 2048.0) as u16;
+    let mut ctx = RenderContext::new_with(w, h, vello_cpu::RenderSettings { num_threads: 0, ..Default::default() });
+    let opts = RenderOpts { scale: fit, ..Default::default() };
+    let f = Frame { pres, opts: &opts, fields: SlideFields::new(1, String::new(), &opts) };
+    let view = Affine::scale(fit) * Affine::translate(-b.origin().to_vec2());
+    RENDERER.with(|r| {
+        let mut r = r.borrow_mut();
+        for s in items {
+            r.shape(&mut ctx, &f, &rctx, s, view, 0);
+        }
+        Some(r.finish(ctx, w, h))
+    })
+}
+
 /// Render one shape alone onto a transparent canvas (drag previews, copy as picture).
 pub fn render_shape(pres: &Presentation, slide: &Slide, id: ShapeId, scale: f64) -> Option<Image> {
     let rctx = Ctx::for_slide(pres, slide)?;
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..2c469218 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -35,6 +35,22 @@ fn shape_fill_uses_theme_accent() {
     assert_eq!(img.pixel(50, 50), [255, 255, 255, 255]);
 }
 
+#[test]
+fn render_shapes_draws_the_selection_on_a_transparent_canvas() {
+    let sh = Shape {
+        id: ShapeId(880),
+        xfrm: Some(Xfrm::new(100.0, 80.0, 60.0, 40.0)),
+        fill: Some(deckcraft_model::Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 0, 0)))),
+        line: Some(deckcraft_model::Line::none()),
+        ..Default::default()
+    };
+    let p = deck_with(vec![sh]);
+    let img = render_shapes(&p, &p.slides[0], &[ShapeId(880)], 1.0).expect("picture");
+    let mid = img.pixel(img.width / 2, img.height / 2);
+    assert!(mid[0] > 200 && mid[1] < 40 && mid[3] > 200, "{mid:?}");
+    assert_eq!(img.pixel(0, 0)[3], 0, "{:?}", img.pixel(0, 0));
+}
+
 #[test]
 fn text_draws_ink() {
     let mut sh = Shape { id: ShapeId(501), xfrm: Some(Xfrm::new(0.0, 0.0, 960.0, 540.0)), text_box: true, ..Default::default() };
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ec97e6e6..7cf2fde3 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -60,6 +60,10 @@ pub struct Services {
     pub inbox: Option<Inbox>,
     /// Image on the system clipboard (PNG bytes), when the host can read one.
     pub clipboard_image: Option<Box<dyn FnMut() -> Option<Vec<u8>>>>,
+    /// HTML on the system clipboard (Pages, Keynote, and other apps that write `public.html`).
+    pub clipboard_html: Option<Box<dyn FnMut() -> Option<String>>>,
+    /// Put HTML and its plain-text alternative on the system clipboard. `true` when it landed.
+    pub clipboard_set_html: Option<Box<dyn FnMut(&str, &str) -> bool>>,
     /// Audio output for media playback (cpal on desktop); without one media plays silently.
     pub audio_out: Option<Box<dyn deckcraft_media::AudioOut>>,
 }
@@ -881,28 +885,24 @@ impl SlideApp {
                     }
                 }
                 egui::Event::Ime(ime) => self.ime_event(&ime),
-                egui::Event::Copy => {
-                    if let Ok(v) = self.session.execute("edit.copy", &json!({}))
-                        && let Some(t) = v.get("text").and_then(Value::as_str)
-                    {
-                        ctx.copy_text(t.to_string());
-                    }
-                }
-                egui::Event::Cut => {
-                    if let Ok(v) = self.session.execute("edit.cut", &json!({}))
-                        && let Some(t) = v.get("text").and_then(Value::as_str)
-                    {
-                        ctx.copy_text(t.to_string());
-                    }
-                }
+                egui::Event::Copy => self.publish_clipboard(ctx, false),
+                egui::Event::Cut => self.publish_clipboard(ctx, true),
                 egui::Event::Paste(text) => {
-                    // An image on the clipboard (screenshots, copied pictures) becomes a picture.
+                    // A picture (TIFF from Keynote, a screenshot) lands when the paste has no text.
+                    // Text keeps its HTML (bold, italic, underline) when the host can read it.
+                    let html = self.services.clipboard_html.as_mut().and_then(|f| f()).filter(|h| !h.is_empty());
                     let img = if text.is_empty() { self.services.clipboard_image.as_mut().and_then(|f| f()) } else { None };
                     let r = match img {
                         Some(png) => self
                             .session
                             .execute("insert.picture", &json!({"name": "Pasted image.png", "data": deckcraft_engine::cmd::base64_encode(&png)})),
-                        None => self.session.execute("edit.paste", &json!({"text": text})),
+                        None => {
+                            let mut params = json!({"text": text});
+                            if let Some(h) = html {
+                                params["html"] = Value::String(h);
+                            }
+                            self.session.execute("edit.paste", &params)
+                        }
                     };
                     if let Err(e) = r {
                         self.set_status(e.to_string());
@@ -925,6 +925,61 @@ impl SlideApp {
         self.drain_requests();
     }
 
+    /// Offer the copy or cut on the system clipboard.
+    ///
+    /// Slides go out as plain text. A textless shape goes out as a picture (Keynote and Pages
+    /// paste that). Text goes out as HTML plus the same plain words, so a paste back into
+    /// DeckCraft still uses the internal clipboard.
+    fn publish_clipboard(&mut self, ctx: &egui::Context, cut: bool) {
+        // Cut deletes the shapes, so the picture is taken first.
+        let picture = self.textless_selection_image();
+        let cmd = if cut { "edit.cut" } else { "edit.copy" };
+        let Ok(v) = self.session.execute(cmd, &json!({})) else { return };
+        let text = v.get("text").and_then(Value::as_str).unwrap_or("").to_string();
+        let html = v.get("html").and_then(Value::as_str).unwrap_or("").to_string();
+        if !self.session.clipboard.slides.is_empty() {
+            ctx.copy_text(text);
+            return;
+        }
+        if let Some(img) = picture {
+            ctx.copy_image(img);
+            return;
+        }
+        if !html.is_empty() && self.services.clipboard_set_html.as_mut().is_some_and(|f| f(&html, &text)) {
+            return;
+        }
+        ctx.copy_text(text);
+    }
+
+    /// A picture of the selected shapes when none of them has text, on the slide (not a master).
+    fn textless_selection_image(&self) -> Option<egui::ColorImage> {
+        let st = self.session.active()?;
+        if st.selection.target != deckcraft_engine::Target::Slides || st.selection.text.is_some() || st.selection.shapes.is_empty() {
+            return None;
+        }
+        let mut plain = String::new();
+        let mut any = false;
+        for id in &st.selection.shapes {
+            let Some(sh) = st.shape(*id) else { continue };
+            any = true;
+            if let Some(t) = &sh.text {
+                if !plain.is_empty() {
+                    plain.push('\n');
+                }
+                plain.push_str(&t.text());
+            }
+        }
+        if !any || !plain.is_empty() {
+            return None;
+        }
+        let slide = st.current_slide()?;
+        let img = deckcraft_render::render_shapes(&st.doc, slide, &st.selection.shapes, 2.0)?;
+        if img.width == 0 || img.height == 0 {
+            return None;
+        }
+        Some(textures::to_color_image(&img, false))
+    }
+
     /// Lay out the whole window.
     pub fn ui(&mut self, ui: &mut egui::Ui) {
         let ctx = ui.ctx().clone();
@@ -1408,4 +1463,71 @@ mod tests {
         harness.run_steps(3);
         assert_eq!(harness.state().textures.canvas_renders, n, "an unchanged slide isn't rendered again");
     }
+
+    fn step_app(services: Services) -> egui_kittest::Harness<'static, SlideApp> {
+        let mut h = egui_kittest::Harness::builder().with_size(egui::vec2(1200.0, 800.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            SlideApp::new(Session::with_new(), services),
+        );
+        h.run_steps(2);
+        h
+    }
+
+    /// Copy of a bold selection offers HTML; paste of Pages-like HTML keeps the bold.
+    #[test]
+    fn copy_offers_html_and_paste_keeps_bold() {
+        use std::cell::RefCell;
+        use std::rc::Rc;
+        let seen = Rc::new(RefCell::new(None));
+        let record = seen.clone();
+        let services = Services {
+            clipboard_set_html: Some(Box::new(move |html, plain| {
+                *record.borrow_mut() = Some((html.to_string(), plain.to_string()));
+                true
+            })),
+            ..Default::default()
+        };
+        let mut h = step_app(services);
+        let title = h.state().session.active().unwrap().doc.slides[0].shapes[0].id.0;
+        h.state_mut().session.execute("text.edit", &json!({"id": title})).unwrap();
+        h.event(egui::Event::Text("Hi".into()));
+        h.run_steps(1);
+        h.state_mut().session.execute("text.selectAll", &json!({})).unwrap();
+        h.state_mut().session.execute("format.bold", &json!({"on": true})).unwrap();
+        h.event(egui::Event::Copy);
+        h.run_steps(1);
+        let (html, plain) = seen.borrow().clone().expect("html offered");
+        assert!(html.contains("<b>"), "{html}");
+        assert_eq!(plain, "Hi");
+        assert!(!h.output().platform_output.commands.iter().any(|c| matches!(c, egui::output::OutputCommand::CopyText(_))));
+
+        let services = Services { clipboard_html: Some(Box::new(|| Some("<p><b>Hi</b></p>".into()))), ..Default::default() };
+        let mut h = step_app(services);
+        h.event(egui::Event::Paste("Hi".into()));
+        h.run_steps(1);
+        let st = h.state().session.active().unwrap();
+        let body = st
+            .current_slide()
+            .unwrap()
+            .shapes
+            .iter()
+            .find(|sh| sh.text.as_ref().is_some_and(|t| t.text() == "Hi"))
+            .and_then(|sh| sh.text.clone())
+            .expect("pasted text");
+        assert_eq!(body.paragraphs[0].runs[0].props.bold, Some(true), "{body:?}");
+    }
+
+    /// A shape with no text copies out as a picture.
+    #[test]
+    fn a_textless_shape_copies_as_a_picture() {
+        let mut h = step_app(Services::default());
+        h.state_mut().session.execute("shape.insert", &json!({"preset": "rect", "rect": [80.0, 80.0, 120.0, 80.0]})).unwrap();
+        h.event(egui::Event::Copy);
+        h.run_steps(1);
+        let cmds = &h.output().platform_output.commands;
+        assert!(cmds.iter().any(|c| matches!(c, egui::output::OutputCommand::CopyImage(img) if img.size[0] > 0 && img.size[1] > 0)), "{cmds:?}");
+    }
 }
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..dec16e32 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,8 +1,8 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-14 · **Change:** minor (copy and paste rich text and pictures with other apps; previous: text editing keys, #268, and File tab, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-14 · **Change:** minor (copy and paste rich text and pictures with other apps; previous: text editing keys, #268, and File tab, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -85,7 +85,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
 | Drag and drop of files and between thumbnails | yes | yes |
-| Image paste from the clipboard | yes | macOS yes; Windows and Linux no (#53) |
+| Image paste from the clipboard | yes | macOS pastes a picture when the paste carries no text (TIFF), a textless shape copies out as a picture, and rich text copies and pastes as HTML (bold, italic, underline). Windows and Linux image paste stays #53 |
 | Font menu: every installed family with its faces | yes | families yes; only Regular/Bold/Italic faces (#69) |
 
 ## Keyboard shortcuts
@@ -148,6 +148,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Copy and paste rich text (HTML: bold, italic, underline) and a picture of a textless shape with other apps |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From fa4b80ed654b6190fcbfa4c7706ebe1a8373f934 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:40:11 +0300
Subject: [PATCH 299/376] UI: Slide Master Preserve and Title or Footers
 placeholders

Preserve the open master or layout, and turn its title and footer
placeholders on or off. Each change is one undo step, and a value that
is already set is not.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 ROADMAP.md                                |   4 +-
 crates/engine/src/cmd/design.rs           | 302 +++++++++++++++++++++-
 crates/ui-egui/src/master_layout_tests.rs |  61 +++++
 crates/ui-egui/src/ribbon.rs              |  34 +++
 docs/architecture.md                      |   5 +-
 docs/gaps.md                              |   3 +-
 docs/target-app-parity.md                 |  11 +-
 docs/ui-parity.md                         |   6 +-
 8 files changed, 413 insertions(+), 13 deletions(-)
 create mode 100644 crates/ui-egui/src/master_layout_tests.rs

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..c4297df4 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; percentages unchanged; previous: hours to ~95% per audience, ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Slide Master: Preserve on the open master or layout, and Title and Footers placeholder checkboxes. Two commands (`master.preserve`, `master.placeholders`); dialogs stay 27; breadth stays 79% |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Progress log: Slide Master Preserve and Title/Footers placeholders. Percentages unchanged |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index 3cad3f00..d36cce81 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -60,6 +60,16 @@ pub fn specs() -> Vec<CommandSpec> {
             has_doc,
             insert_placeholder
         ),
+        cmd!("master.preserve", "Preserve", ["Slide Master", "Edit Master"], None, "{preserve?: bool}", has_doc, preserve),
+        cmd!(
+            "master.placeholders",
+            "Layout Placeholders",
+            ["Slide Master", "Edit Master"],
+            None,
+            "{title?: bool, footers?: bool}",
+            has_doc,
+            placeholders
+        ),
     ]
 }
 
@@ -432,8 +442,14 @@ pub fn civil(z: i64) -> (i64, u32, u32) {
 fn master_view(s: &mut Session, p: &Value) -> Result<Value> {
     let st = s.doc()?;
     let mi = usize_param(p, "master").unwrap_or_else(|| master_index(&st.doc, &st.selection));
-    let layout = usize_param(p, "layout")
-        .or_else(|| st.current_slide().and_then(|sl| st.doc.masters.get(mi).and_then(|m| m.layouts.iter().position(|l| l.id == sl.layout))));
+    // A master thumbnail sends `{master}` and means the master itself. `{master, layout}` selects
+    // that layout. With neither key, follow the current slide's layout.
+    let layout = if p.get("master").is_some() && p.get("layout").is_none() {
+        None
+    } else {
+        usize_param(p, "layout")
+            .or_else(|| st.current_slide().and_then(|sl| st.doc.masters.get(mi).and_then(|m| m.layouts.iter().position(|l| l.id == sl.layout))))
+    };
     let target = match layout {
         Some(l) => Target::Layout { master: mi, layout: l },
         None => Target::Master { master: mi },
@@ -556,11 +572,293 @@ fn insert_placeholder(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"id": id}))
 }
 
+fn preserve(s: &mut Session, p: &Value) -> Result<Value> {
+    let st = s.doc()?;
+    let (on_master, mi, li, current) = match st.selection.target {
+        Target::Master { master } => {
+            let on = st.doc.masters.get(master).map(|m| m.preserve).ok_or_else(|| bad("master.preserve", "no such master"))?;
+            (true, master, 0, on)
+        }
+        Target::Layout { master, layout } => {
+            let on = st
+                .doc
+                .masters
+                .get(master)
+                .and_then(|m| m.layouts.get(layout))
+                .map(|l| l.preserve)
+                .ok_or_else(|| bad("master.preserve", "no such layout"))?;
+            (false, master, layout, on)
+        }
+        Target::Slides => return Err(bad("master.preserve", "open Slide Master view")),
+    };
+    let next = bool_param(p, "preserve").unwrap_or(!current);
+    if next == current {
+        return Ok(json!({"preserve": next}));
+    }
+    s.edit(|doc, _| {
+        if on_master {
+            let m = Arc::make_mut(doc.masters.get_mut(mi).ok_or_else(|| bad("master.preserve", "no such master"))?);
+            m.preserve = next;
+        } else {
+            let l =
+                doc.masters.get_mut(mi).and_then(|m| Arc::make_mut(m).layouts.get_mut(li)).ok_or_else(|| bad("master.preserve", "no such layout"))?;
+            l.preserve = next;
+        }
+        Ok(())
+    })?;
+    Ok(json!({"preserve": next}))
+}
+
+fn placeholders(s: &mut Session, p: &Value) -> Result<Value> {
+    let title = bool_param(p, "title");
+    let footers = bool_param(p, "footers");
+    if title.is_none() && footers.is_none() {
+        return Err(bad("master.placeholders", "give title or footers"));
+    }
+    let st = s.doc()?;
+    if matches!(st.selection.target, Target::Slides) {
+        return Err(bad("master.placeholders", "open Slide Master view"));
+    }
+    let has_title = st.shapes().iter().any(|sh| sh.ph_type().is_some_and(PhType::is_title));
+    let has_footers = st.shapes().iter().any(|sh| sh.ph_type().is_some_and(PhType::is_footer_kind));
+    let title_changes = title.is_some_and(|want| want != has_title);
+    let footer_changes = footers.is_some_and(|want| want != has_footers);
+    if !title_changes && !footer_changes {
+        return Ok(json!({"title": has_title, "footers": has_footers}));
+    }
+    let mut add = Vec::new();
+    if title == Some(true) && !has_title {
+        add.push(PhType::Title);
+    }
+    if footers == Some(true) && !has_footers {
+        add.extend([PhType::Date, PhType::Footer, PhType::SlideNum]);
+    }
+    let size = st.doc.slide_size;
+    s.edit(|doc, sel| {
+        let mut ids = Vec::with_capacity(add.len());
+        for _ in 0..add.len() {
+            ids.push(ShapeId(doc.alloc_id()));
+        }
+        let prototypes = match sel.target {
+            Target::Master { master } | Target::Layout { master, .. } => doc.masters.get(master).map(|m| m.shapes.clone()).unwrap_or_default(),
+            Target::Slides => Vec::new(),
+        };
+        let shapes = crate::shapes_mut(doc, sel).ok_or_else(|| bad("master.placeholders", "open Slide Master view"))?;
+        if title == Some(false) {
+            shapes.retain(|sh| !sh.ph_type().is_some_and(PhType::is_title));
+        }
+        if footers == Some(false) {
+            shapes.retain(|sh| !sh.ph_type().is_some_and(PhType::is_footer_kind));
+        }
+        for (kind, id) in add.into_iter().zip(ids) {
+            let idx = free_ph_idx(shapes, preferred_ph_idx(kind));
+            let proto = prototypes.iter().find(|sh| match kind {
+                PhType::Title => sh.ph_type().is_some_and(PhType::is_title),
+                other => sh.ph_type() == Some(other),
+            });
+            let shape = match proto {
+                Some(src) => retarget_placeholder(src.clone(), id, idx),
+                None => synthesized_placeholder(kind, id, idx, size),
+            };
+            shapes.push(shape);
+        }
+        Ok(())
+    })?;
+    let st = s.doc()?;
+    let title = st.shapes().iter().any(|sh| sh.ph_type().is_some_and(PhType::is_title));
+    let footers = st.shapes().iter().any(|sh| sh.ph_type().is_some_and(PhType::is_footer_kind));
+    Ok(json!({"title": title, "footers": footers}))
+}
+
+fn preferred_ph_idx(kind: PhType) -> u32 {
+    match kind {
+        PhType::Title | PhType::CtrTitle => 0,
+        PhType::Date => 10,
+        PhType::Footer => 11,
+        PhType::SlideNum => 12,
+        _ => 1,
+    }
+}
+
+fn free_ph_idx(shapes: &[Shape], preferred: u32) -> u32 {
+    let taken = |idx: u32| shapes.iter().any(|sh| sh.ph.as_ref().is_some_and(|p| p.idx == idx));
+    if !taken(preferred) { preferred } else { shapes.iter().filter_map(|sh| sh.ph.as_ref().map(|p| p.idx)).max().unwrap_or(0).saturating_add(1) }
+}
+
+/// A copy of a master placeholder, with a new id and index. Prompt text is cleared; a slide
+/// number keeps its `‹#›` field.
+fn retarget_placeholder(mut sh: Shape, id: ShapeId, idx: u32) -> Shape {
+    sh.id = id;
+    if let Some(ph) = sh.ph.as_mut() {
+        ph.idx = idx;
+    }
+    let slide_num = sh.ph_type() == Some(PhType::SlideNum);
+    if slide_num {
+        let paras = vec![slide_number_paragraph()];
+        if let Some(text) = sh.text.as_mut() {
+            text.paragraphs = paras;
+        } else {
+            sh.text = Some(TextBody { paragraphs: paras, ..Default::default() });
+        }
+    } else if let Some(text) = sh.text.as_mut() {
+        text.paragraphs.clear();
+    }
+    sh
+}
+
+fn synthesized_placeholder(kind: PhType, id: ShapeId, idx: u32, size: Size) -> Shape {
+    let (name, text) = match kind {
+        PhType::Date => ("Date Placeholder", TextBody::default()),
+        PhType::Footer => ("Footer Placeholder", TextBody::default()),
+        PhType::SlideNum => ("Slide Number Placeholder", TextBody { paragraphs: vec![slide_number_paragraph()], ..Default::default() }),
+        _ => ("Title", TextBody::default()),
+    };
+    Shape {
+        id,
+        name: name.into(),
+        xfrm: Some(placeholder_rect(kind, size)),
+        ph: Some(deckcraft_model::Placeholder { kind, idx, ..Default::default() }),
+        text: Some(text),
+        ..Default::default()
+    }
+}
+
+/// Standard placeholder boxes at 960×540, scaled to the slide size.
+fn placeholder_rect(kind: PhType, size: Size) -> deckcraft_geom::Xfrm {
+    let sx = size.width / 960.0;
+    let sy = size.height / 540.0;
+    let (x, y, w, h) = match kind {
+        PhType::Date => (60.0, 500.0, 216.0, 28.0),
+        PhType::Footer => (318.0, 500.0, 324.0, 28.0),
+        PhType::SlideNum => (684.0, 500.0, 216.0, 28.0),
+        _ => (60.0, 29.0, 840.0, 104.0),
+    };
+    deckcraft_geom::Xfrm::new(x * sx, y * sy, w * sx, h * sy)
+}
+
+fn slide_number_paragraph() -> deckcraft_model::Paragraph {
+    deckcraft_model::Paragraph {
+        runs: vec![Run { text: "‹#›".into(), props: Default::default(), kind: RunKind::Field { field: "slidenum".into() } }],
+        ..Default::default()
+    }
+}
+
 #[cfg(test)]
 mod tests {
+    use deckcraft_model::PhType;
+    use deckcraft_model::text::RunKind;
+    use serde_json::json;
+
+    use crate::{Session, Target};
+
     #[test]
     fn civil_dates() {
         assert_eq!(super::civil(0), (1970, 1, 1));
         assert_eq!(super::civil(20_734), (2026, 10, 8));
     }
+
+    fn shapes(s: &Session) -> Vec<deckcraft_model::Shape> {
+        s.doc().unwrap().shapes().to_vec()
+    }
+
+    fn has_title(s: &Session) -> bool {
+        shapes(s).iter().any(|sh| sh.ph_type().is_some_and(PhType::is_title))
+    }
+
+    fn has_footers(s: &Session) -> bool {
+        shapes(s).iter().any(|sh| sh.ph_type().is_some_and(PhType::is_footer_kind))
+    }
+
+    #[test]
+    fn preserve_and_placeholders_edit_the_open_master_or_layout() {
+        assert_eq!(crate::command_specs().len(), 236);
+
+        let mut s = Session::with_new();
+        let blank = s.doc().unwrap().doc.masters[0].layouts.iter().position(|l| l.name == "Blank").unwrap();
+
+        s.execute("view.slideMaster", &json!({})).unwrap();
+        assert_eq!(s.doc().unwrap().selection.target, Target::Layout { master: 0, layout: 0 });
+        s.execute("view.slideMaster", &json!({"master": 0})).unwrap();
+        assert_eq!(s.doc().unwrap().selection.target, Target::Master { master: 0 });
+        assert!(!s.doc().unwrap().doc.masters[0].preserve);
+
+        let n = s.doc().unwrap().history.undo.len();
+        s.execute("master.preserve", &json!({"preserve": false})).unwrap();
+        assert_eq!(s.doc().unwrap().history.undo.len(), n, "the same value is not an undo step");
+        s.execute("master.preserve", &json!({})).unwrap();
+        assert!(s.doc().unwrap().doc.masters[0].preserve);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Preserve");
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert!(!s.doc().unwrap().doc.masters[0].preserve);
+
+        s.execute("master.placeholders", &json!({"footers": false})).unwrap();
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Layout Placeholders");
+        assert!(has_title(&s));
+        assert!(!has_footers(&s));
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert!(has_footers(&s));
+
+        s.execute("view.closeMaster", &json!({})).unwrap();
+        let n = s.doc().unwrap().history.undo.len();
+        let err = s.execute("master.preserve", &json!({})).unwrap_err();
+        assert!(err.to_string().contains("open Slide Master view"), "{err}");
+        let err = s.execute("master.placeholders", &json!({"title": true})).unwrap_err();
+        assert!(err.to_string().contains("open Slide Master view"), "{err}");
+        let err = s.execute("master.placeholders", &json!({})).unwrap_err();
+        assert!(err.to_string().contains("give title or footers"), "{err}");
+        assert_eq!(s.doc().unwrap().history.undo.len(), n);
+
+        s.execute("view.slideMaster", &json!({"master": 0, "layout": blank})).unwrap();
+        assert_eq!(s.doc().unwrap().selection.target, Target::Layout { master: 0, layout: blank });
+        assert!(s.doc().unwrap().doc.masters[0].layouts[blank].preserve);
+        assert!(!has_title(&s));
+        assert!(has_footers(&s));
+
+        let n = s.doc().unwrap().history.undo.len();
+        s.execute("master.placeholders", &json!({"title": false, "footers": true})).unwrap();
+        assert_eq!(s.doc().unwrap().history.undo.len(), n, "already in that state");
+
+        s.execute("master.placeholders", &json!({"title": true, "footers": false})).unwrap();
+        assert_eq!(s.doc().unwrap().history.undo.len(), n + 1, "both keys are one undo step");
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Layout Placeholders");
+        assert!(has_title(&s));
+        assert!(!has_footers(&s));
+        let title = shapes(&s).into_iter().find(|sh| sh.ph_type().is_some_and(PhType::is_title)).unwrap();
+        assert_eq!(title.name, "Title 1");
+        assert_eq!(title.ph.unwrap().idx, 0);
+        assert!(title.text.unwrap().paragraphs.iter().all(|para| para.runs.is_empty()));
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert!(!has_title(&s));
+        assert!(has_footers(&s));
+
+        s.execute("master.placeholders", &json!({"footers": false})).unwrap();
+        s.execute("master.placeholders", &json!({"footers": true})).unwrap();
+        let restored = shapes(&s);
+        assert!(restored.iter().any(|sh| sh.ph_type() == Some(PhType::Date)));
+        assert!(restored.iter().any(|sh| sh.ph_type() == Some(PhType::Footer)));
+        let num = restored.iter().find(|sh| sh.ph_type() == Some(PhType::SlideNum)).unwrap();
+        let run = &num.text.as_ref().unwrap().paragraphs[0].runs[0];
+        assert_eq!(run.text, "‹#›");
+        assert!(matches!(&run.kind, RunKind::Field { field } if field == "slidenum"));
+
+        assert!(s.doc().unwrap().doc.masters[0].layouts[blank].preserve);
+        s.execute("master.preserve", &json!({"preserve": false})).unwrap();
+        assert!(!s.doc().unwrap().doc.masters[0].layouts[blank].preserve);
+        assert_eq!(s.doc().unwrap().history.undo.last().unwrap().label, "Preserve");
+        s.execute("edit.undo", &json!({})).unwrap();
+        assert!(s.doc().unwrap().doc.masters[0].layouts[blank].preserve);
+
+        s.edit(|doc, _| {
+            let m = std::sync::Arc::make_mut(doc.masters.get_mut(0).unwrap());
+            m.shapes.retain(|sh| !sh.ph_type().is_some_and(PhType::is_title));
+            Ok(())
+        })
+        .unwrap();
+        s.execute("master.placeholders", &json!({"title": true})).unwrap();
+        let title = shapes(&s).into_iter().find(|sh| sh.ph_type() == Some(PhType::Title)).unwrap();
+        assert_eq!(title.name, "Title");
+        let box_ = title.xfrm.unwrap();
+        assert!((box_.x - 60.0).abs() < 0.01 && (box_.y - 29.0).abs() < 0.01);
+        assert!((box_.w - 840.0).abs() < 0.01 && (box_.h - 104.0).abs() < 0.01);
+    }
 }
diff --git a/crates/ui-egui/src/master_layout_tests.rs b/crates/ui-egui/src/master_layout_tests.rs
new file mode 100644
index 00000000..d4f5efa0
--- /dev/null
+++ b/crates/ui-egui/src/master_layout_tests.rs
@@ -0,0 +1,61 @@
+//! Slide Master ribbon: Preserve, Title and Footers on the open layout.
+#![allow(clippy::unwrap_used, clippy::expect_used)]
+
+use deckcraft_engine::Session;
+use deckcraft_model::PhType;
+use egui::accesskit::Role;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use serde_json::json;
+
+use crate::{Services, SlideApp};
+
+fn harness(app: SlideApp) -> Harness<'static, SlideApp> {
+    let mut h = Harness::builder().with_size(egui::vec2(1800.0, 900.0)).build_ui_state(
+        |ui, app: &mut SlideApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        app,
+    );
+    h.run_steps(3);
+    h
+}
+
+fn app_on_blank() -> (SlideApp, usize) {
+    let mut session = Session::with_new();
+    let blank = session.doc().unwrap().doc.masters[0].layouts.iter().position(|l| l.name == "Blank").unwrap();
+    session.execute("view.slideMaster", &json!({"master": 0, "layout": blank})).unwrap();
+    let mut app = SlideApp::new(session, Services::default());
+    app.ui.tab = "Slide Master".into();
+    (app, blank)
+}
+
+fn click_check(h: &mut Harness<'_, SlideApp>, label: &str) {
+    h.query_all_by_role_and_label(Role::CheckBox, label).next().unwrap_or_else(|| panic!("no {label} checkbox")).click();
+    h.run_steps(3);
+}
+
+#[test]
+fn slide_master_preserve_title_and_footers() {
+    let (app, blank) = app_on_blank();
+    let mut h = harness(app);
+    assert!(h.query_all_by_role_and_label(Role::CheckBox, "Preserve").next().is_some());
+    assert!(h.query_all_by_role_and_label(Role::CheckBox, "Title").next().is_some());
+    assert!(h.query_all_by_role_and_label(Role::CheckBox, "Footers").next().is_some());
+    {
+        let st = h.state().session.doc().unwrap();
+        assert!(st.doc.masters[0].layouts[blank].preserve);
+        assert!(!st.shapes().iter().any(|sh| sh.ph_type().is_some_and(PhType::is_title)));
+        assert!(st.shapes().iter().any(|sh| sh.ph_type().is_some_and(PhType::is_footer_kind)));
+    }
+
+    click_check(&mut h, "Title");
+    assert!(h.state().session.doc().unwrap().shapes().iter().any(|sh| sh.ph_type().is_some_and(PhType::is_title)));
+
+    click_check(&mut h, "Footers");
+    assert!(!h.state().session.doc().unwrap().shapes().iter().any(|sh| sh.ph_type().is_some_and(PhType::is_footer_kind)));
+
+    click_check(&mut h, "Preserve");
+    assert!(!h.state().session.doc().unwrap().doc.masters[0].layouts[blank].preserve);
+}
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 428eff0b..af1a3b63 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2372,12 +2372,42 @@ fn playback(app: &mut SlideApp, ui: &mut Ui) {
     });
 }
 
+/// Preserve, and whether the open master or layout has a title or any footer placeholder.
+fn master_checks(app: &SlideApp) -> (bool, bool, bool) {
+    let Some(st) = app.session.active() else { return (false, false, false) };
+    let preserve = match st.selection.target {
+        Target::Master { master } => st.doc.masters.get(master).is_some_and(|m| m.preserve),
+        Target::Layout { master, layout } => st.doc.masters.get(master).and_then(|m| m.layouts.get(layout)).is_some_and(|l| l.preserve),
+        Target::Slides => false,
+    };
+    let title = st.shapes().iter().any(|sh| sh.ph_type().is_some_and(|k| k.is_title()));
+    let footers = st.shapes().iter().any(|sh| sh.ph_type().is_some_and(|k| k.is_footer_kind()));
+    (preserve, title, footers)
+}
+
 fn slide_master(app: &mut SlideApp, ui: &mut Ui) {
     group(ui, |ui| {
         big(app, ui, Icon::NewSlide, "Insert\nLayout", "master.insertLayout", json!({}));
         big(app, ui, Icon::DeleteSlide, "Delete", "master.deleteLayout", json!({}));
         big(app, ui, Icon::Layout, "Rename", "app.dialog", json!({"id": "renameLayout"}));
     });
+    group(ui, |ui| {
+        rows(ui, |ui| {
+            let (preserve, title, footers) = master_checks(app);
+            let mut on = preserve;
+            if ui.checkbox(&mut on, "Preserve").changed() {
+                run(app, "master.preserve", json!({"preserve": on}));
+            }
+            let mut on = title;
+            if ui.checkbox(&mut on, "Title").changed() {
+                run(app, "master.placeholders", json!({"title": on}));
+            }
+            let mut on = footers;
+            if ui.checkbox(&mut on, "Footers").changed() {
+                run(app, "master.placeholders", json!({"footers": on}));
+            }
+        });
+    });
     group(ui, |ui| {
         let r = big_button(ui, Icon::Table, "Insert\nPlaceholder", true);
         egui::Popup::menu(&r).show(|ui| {
@@ -2420,3 +2450,7 @@ fn paint_freeform_icon(p: &egui::Painter, r: Rect, name: &str, ink: Color32) {
     };
     p.add(egui::Shape::line(pts, egui::Stroke::new(1.3, ink)));
 }
+
+#[cfg(test)]
+#[path = "master_layout_tests.rs"]
+mod master_layout_tests;
diff --git a/docs/architecture.md b/docs/architecture.md
index 2849f870..a11c7ed1 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,6 +1,6 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (transition frames: perspective meshes, slide parts, headless compositor; previous: created from the code on main at d556ff9) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (command registry counted at 236; dialogs stay 27; the test-count line stays 504; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
@@ -20,7 +20,7 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (236 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
 | L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
@@ -78,5 +78,6 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Command registry counted at 236, including `master.preserve` and `master.placeholders`. Dialogs stay 27. The test-count line stays 504. The menu measurement and the d556ff9 snapshot still count 226 |
 | 2026-10-13 | minor | Transitions: perspective meshes, background/content parts, CPU compositor |
 | 2026-10-10 | major | Created from the code on main (d556ff9) and AGENTS.md §4 |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..0b3af950 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; checklist letters unchanged, breadth stays 79%, dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -256,6 +256,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Slide Master Preserve and Title/Footers placeholders. Checklist letters unchanged (breadth stays 79%); dialogs stay 27 |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 99653dc7..cae2ec26 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,6 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; replaces the parity sections of ROADMAP.md) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers; automation counted at 236 commands; the menu measurement and the d556ff9 snapshot still count 226; percentages unchanged; previous: hours to ~95% per audience, ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -230,8 +230,8 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide, pen,
   presenter window, rehearse timings, custom shows, Set Up Show, Reading View; links and shape
   actions followed on click.
-- **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom;
-  grayscale.
+- **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master (Preserve on
+  the open master or layout, and Title and Footers placeholders); zoom; grayscale.
 - **Review:** comments with replies and resolve, accessibility checker, a basic spelling list.
 - **Media:** MP3, AAC/M4A, ALAC, WAV, AIFF, CAF, FLAC, Ogg Vorbis and Opus audio; H.264, HEVC,
   VP9 and AV1 video in MP4/MOV/WebM/MKV with pure-Rust decoders; poster frames, trim, fades,
@@ -239,8 +239,8 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 226 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-  and MCP.
+- **Automation:** 236 commands, every one reachable from `deckcraft-cli`, the JSON control channel
+  and MCP. The menu-bar measurement and the d556ff9 snapshot still count 226 commands.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
 
@@ -276,6 +276,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Slide Master Preserve and Title/Footers placeholders. Automation in "what works today" is 236 commands; the menu-bar measurement and the d556ff9 snapshot still count 226. Percentages unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index c403f05e..380f573b 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,8 +1,8 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-12 · **Change:** minor (text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; previous: text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -60,6 +60,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 |---|---|---|
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
 | Format Background pane | yes | yes |
+| Slide Master | Insert Layout, Rename, Delete, Preserve, Insert Placeholder, Title and Footers | Insert Layout, Rename, Delete, Insert Placeholder, and Preserve, Title and Footers checkboxes (`master.preserve`, `master.placeholders`). A master thumbnail selects the master |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes |
@@ -148,6 +149,7 @@ imitate Microsoft's. No pixel comparison against PowerPoint screenshots has been
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Slide Master: Preserve, and Title and Footers placeholders, on the open master or layout |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 084e076c1da8fe97e51225f8d1c40db0cb405a87 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:41:16 +0300
Subject: [PATCH 300/376] Undo: cap the history by memory as well as by steps

Undo kept up to 500 steps whatever their size. Steps share what an edit didn't touch, so most
are small, but a deck-wide edit (slide size, theme, find-and-replace style changes) keeps a copy
of every slide: 500 of those on a big deck could hold hundreds of copies. Each step's cost is now
estimated when it is pushed (the slides, masters and media it doesn't share with the document
after it), and the oldest steps are dropped while the total passes History::byte_limit
(UNDO_BYTE_BUDGET, 256 MiB, by default). The newest step always stays.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 crates/engine/src/lib.rs   | 70 +++++++++++++++++++++++++++++++++++---
 crates/engine/src/tests.rs | 30 ++++++++++++++++
 2 files changed, 96 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index c2b56c7f..0ea81356 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -129,6 +129,12 @@ pub struct History {
     pub undo: Vec<HistoryEntry>,
     pub redo: Vec<HistoryEntry>,
     pub limit: usize,
+    /// Most memory (estimated bytes) the undo steps may keep beyond the current document;
+    /// 0 means [`UNDO_BYTE_BUDGET`].
+    pub byte_limit: usize,
+    /// Estimated bytes each undo step keeps that the document after it doesn't share, by the
+    /// step's document address.
+    pub costs: std::collections::HashMap<usize, usize>,
 }
 
 /// A live pointer interaction: the document before it began (one undo step at the end).
@@ -543,11 +549,67 @@ fn clamp_selection(st: &mut DocState) {
     }
 }
 
+/// Default for [`History::byte_limit`].
+pub const UNDO_BYTE_BUDGET: usize = 256 << 20;
+
+/// A rough size of a shape in memory: the struct, its text and kept XML, its children.
+fn shape_cost(sh: &deckcraft_model::Shape, depth: usize) -> usize {
+    let text: usize =
+        sh.text.as_ref().map_or(0, |t| t.paragraphs.iter().map(|p| 96 + p.runs.iter().map(|r| 128 + r.text.len()).sum::<usize>()).sum());
+    let kids: usize = if depth < 64 { sh.children().iter().map(|c| shape_cost(c, depth + 1)).sum() } else { 0 };
+    768 + text + sh.raw_ext.as_ref().map_or(0, String::len) + kids
+}
+
+fn shapes_cost(shapes: &[deckcraft_model::Shape]) -> usize {
+    shapes.iter().map(|s| shape_cost(s, 0)).sum()
+}
+
+/// Estimated bytes `doc` keeps alive that `newer` doesn't share: its slides, masters and media
+/// that aren't the same allocations (undo steps share everything an edit didn't touch).
+pub fn undo_cost(doc: &Presentation, newer: &Presentation) -> usize {
+    use std::collections::HashSet;
+    let slides: HashSet<*const deckcraft_model::Slide> = newer.slides.iter().map(Arc::as_ptr).collect();
+    let masters: HashSet<*const deckcraft_model::Master> = newer.masters.iter().map(Arc::as_ptr).collect();
+    let media: HashSet<*const Vec<u8>> = newer.media.iter().map(|m| Arc::as_ptr(&m.data)).collect();
+    let mut n = 64 * doc.slides.len();
+    for s in doc.slides.iter().filter(|s| !slides.contains(&Arc::as_ptr(s))) {
+        n += 512 + shapes_cost(&s.shapes);
+    }
+    for m in doc.masters.iter().filter(|m| !masters.contains(&Arc::as_ptr(m))) {
+        n += 4096 + shapes_cost(&m.shapes) + m.layouts.iter().map(|l| 512 + shapes_cost(&l.shapes)).sum::<usize>();
+    }
+    for m in doc.media.iter().filter(|m| !media.contains(&Arc::as_ptr(&m.data))) {
+        n += m.data.len();
+    }
+    n
+}
+
 pub(crate) fn push_undo(st: &mut DocState, e: HistoryEntry) {
-    st.history.undo.push(e);
-    st.history.redo.clear();
-    if st.history.undo.len() > st.history.limit.max(1) {
-        st.history.undo.remove(0);
+    let h = &mut st.history;
+    h.costs.insert(Arc::as_ptr(&e.doc) as usize, undo_cost(&e.doc, &st.doc));
+    h.undo.push(e);
+    h.redo.clear();
+    if h.undo.len() > h.limit.max(1) {
+        h.undo.remove(0);
+    }
+    // Memory too: drop the oldest steps while the kept ones pass the budget (the newest always
+    // stays, however big). A deck-wide edit keeps a copy of every slide, so 500 of them on a big
+    // deck could hold hundreds of copies.
+    let budget = if h.byte_limit == 0 { UNDO_BYTE_BUDGET } else { h.byte_limit };
+    let cost = |h: &History, e: &HistoryEntry| h.costs.get(&(Arc::as_ptr(&e.doc) as usize)).copied().unwrap_or(0);
+    let mut total: usize = h.undo.iter().map(|e| cost(h, e)).sum();
+    let mut drop = 0;
+    while total > budget && drop + 1 < h.undo.len() {
+        total -= cost(h, &h.undo[drop]);
+        drop += 1;
+    }
+    if drop > 0 {
+        h.undo.drain(..drop);
+    }
+    // Costs of steps that are gone (dropped, or redo steps cleared above).
+    if h.costs.len() > h.undo.len() + 16 {
+        let live: std::collections::HashSet<usize> = h.undo.iter().chain(h.redo.iter()).map(|e| Arc::as_ptr(&e.doc) as usize).collect();
+        h.costs.retain(|k, _| live.contains(k));
     }
 }
 
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..c424ce11 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -835,3 +835,33 @@ fn slide_ranges_parse_like_powerpoints_print_box() {
     let opts = cmd::file::pdf_options(&json!({"slides": [0, 7, 1]}), 2).unwrap();
     assert_eq!(opts.slides, Some(vec![0, 1]), "indices past the end are dropped");
 }
+
+/// Undo keeps a bounded amount of memory: deck-wide edits (each step holds a copy of every
+/// slide) are dropped oldest first once the steps pass the byte budget, while ordinary small
+/// edits still get the full step count.
+#[test]
+fn undo_history_is_capped_by_memory_as_well_as_steps() {
+    let mut s = Session::with_new();
+    for _ in 0..40 {
+        s.execute("slide.new", &json!({})).unwrap();
+    }
+    let one_copy = crate::undo_cost(&s.doc().unwrap().doc, &Presentation::default());
+    assert!(one_copy > 0);
+    s.doc_mut().unwrap().history = History { limit: 500, byte_limit: one_copy * 10, ..Default::default() };
+    for i in 0..30 {
+        // Resizing the slides rescales every shape on every slide: a new copy of each.
+        let w = if i % 2 == 0 { 720 } else { 960 };
+        s.execute("design.slideSize", &json!({"w": w, "h": 540})).unwrap();
+    }
+    let n = s.doc().unwrap().history.undo.len();
+    assert!((5..=11).contains(&n), "{n} deck-wide steps kept");
+    // Still undoable, newest first.
+    s.execute("edit.undo", &json!({})).unwrap();
+    // Small edits: each keeps one slide's copy, so many fit.
+    let mut s = Session::with_new();
+    s.doc_mut().unwrap().history.byte_limit = one_copy * 10;
+    for _ in 0..120 {
+        s.execute("slide.new", &json!({})).unwrap();
+    }
+    assert_eq!(s.doc().unwrap().history.undo.len(), 120);
+}

From f036a8e805a2273fee34f78ad2d8ae2364a6aa24 Mon Sep 17 00:00:00 2001
From: Nikita Rakitin <nnnrrr93@gmail.com>
Date: Wed, 14 Oct 2026 06:44:59 +0300
Subject: [PATCH 301/376] PPTX: Color Pulse emphasis is written as a colour
 change, not a grow

---
 crates/pptx/src/write/timing.rs | 19 +++++++++++++++++++
 crates/pptx/tests/roundtrip.rs  | 25 +++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/crates/pptx/src/write/timing.rs b/crates/pptx/src/write/timing.rs
index aa577ca7..f60b937c 100644
--- a/crates/pptx/src/write/timing.rs
+++ b/crates/pptx/src/write/timing.rs
@@ -354,6 +354,25 @@ fn behaviors(w: &mut W, x: &mut Exp, ids: &mut Ids, e: &Eff) {
                 w.close("p:to");
                 w.close("p:set");
             }
+            "colorPulse" => {
+                // As PowerPoint writes it: text and fill go to the colour and back (autoRev). The behaviour
+                // duration is the one import reads as the effect duration.
+                let c = a.color.clone().unwrap_or(deckcraft_model::ColorRef::rgb(deckcraft_color::Rgba::rgb(0xC0, 0x00, 0x00)));
+                for (attr, child) in [("style.color", true), ("fillcolor", false)] {
+                    w.open("p:animClr", A::new().a("clrSpc", "rgb").a("dir", "cw"));
+                    w.open("p:cBhvr", A::new().o("override", child.then_some("childStyle")));
+                    w.empty("p:cTn", A::new().a("id", ids.next()).a("dur", dur.max(1)).a("autoRev", "1").a("fill", "remove"));
+                    tgt(w, e.spid, e.paragraph);
+                    w.open0("p:attrNameLst");
+                    w.elt("p:attrName", attr);
+                    w.close("p:attrNameLst");
+                    w.close("p:cBhvr");
+                    w.open0("p:to");
+                    super::dml::color(w, &c);
+                    w.close("p:to");
+                    w.close("p:animClr");
+                }
+            }
             "fillColor" | "objectColor" | "fontColor" | "lineColor" | "complementaryColor" | "darken" | "lighten" => {
                 let attr = match a.effect.as_str() {
                     "fontColor" => "style.color",
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..79884d1f 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,28 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+#[test]
+fn color_pulse_keeps_its_effect_colour_and_duration() {
+    let mut p = defaults::new_presentation(None);
+    let s = shape(&mut p, "Pulsed", 10.0, 10.0, 200.0, 100.0);
+    let id = s.id;
+    let first = p.slides[0].id;
+    let sl = p.slide_mut(first).expect("slide");
+    sl.shapes.push(s);
+    let white = ColorRef::rgb(Rgba::rgb(255, 255, 255));
+    sl.animations.push(Animation {
+        shape: id,
+        class: AnimClass::Emphasis,
+        effect: "colorPulse".into(),
+        duration_ms: 1000,
+        color: Some(white.clone()),
+        ..Default::default()
+    });
+    let q = round(&p);
+    let a = &q.slides[0].animations[0];
+    assert_eq!((a.class, a.effect.as_str()), (AnimClass::Emphasis, "colorPulse"));
+    assert_eq!(a.color, Some(white));
+    assert_eq!(a.amount, None, "no grow/shrink scale is invented");
+    assert_eq!(a.duration_ms, 1000);
+}

From ba290f171ea9faceddd988461a7fa9d594dea409 Mon Sep 17 00:00:00 2001
From: rulindanalambert <rulindanal@gmail.com>
Date: Wed, 14 Oct 2026 07:04:45 +0200
Subject: [PATCH 302/376] Fix presenter-view keyboard navigation and end-screen
 controls

---
 ROADMAP.md                 |   4 +-
 crates/ui-egui/src/show.rs | 208 ++++++++++++++++++++++++++++---------
 docs/slideshow-parity.md   |   4 +-
 3 files changed, 165 insertions(+), 51 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..c519199a 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** minor (hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (presenter keyboard navigation; hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -128,6 +128,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-14 | Presenter View handles the same keyboard navigation as the audience window, consumes handled keys before focused buttons, and remains available at the end screen. Regression tests cover presenter-only input, single-step navigation and Escape |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -150,6 +151,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Presenter keyboard navigation and end-screen controls |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..d90f2d72 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -125,6 +125,7 @@ impl Show {
                 self.step_end = now;
             }
             ShowAction::Slide(i) => {
+                self.ended = false;
                 if self.rehearse {
                     self.timings.push((self.timeline.as_ref().map(|t| t.0).unwrap_or(i), now - self.slide_start));
                 }
@@ -243,6 +244,67 @@ fn part_textures(ctx: &egui::Context, doc: &Presentation, from: Option<usize>, t
     ]
 }
 
+/// Read the current viewport's show keys before its widgets can consume them. Both the
+/// audience window and Presenter View use this path, including animation steps and end-of-show.
+fn keyboard(ctx: &egui::Context, show: &mut Show, doc: &Presentation, now: f64) -> bool {
+    let keys: Vec<(egui::Key, egui::Modifiers)> = ctx.input(|i| {
+        i.events
+            .iter()
+            .filter_map(|e| if let egui::Event::Key { key, pressed: true, modifiers, .. } = e { Some((*key, *modifiers)) } else { None })
+            .collect()
+    });
+    let mut keep = true;
+    let mut actions = vec![];
+    for (k, m) in keys {
+        use egui::Key::*;
+        match k {
+            Escape | Minus => keep = false,
+            ArrowRight | ArrowDown | Space | PageDown | N => {
+                if show.ended {
+                    keep = false;
+                } else {
+                    actions.push(show.state.next(doc));
+                }
+            }
+            Enter => {
+                if let Ok(n) = show.goto.parse::<usize>() {
+                    actions.push(show.state.goto(doc, n.saturating_sub(1)));
+                    show.goto.clear();
+                } else if show.ended {
+                    keep = false;
+                } else {
+                    actions.push(show.state.next(doc));
+                }
+            }
+            ArrowLeft | ArrowUp | Backspace | PageUp | P if !(k == P && m.command) => {
+                show.ended = false;
+                actions.push(show.state.prev(doc));
+            }
+            P if m.command => show.pen = !show.pen,
+            A if m.command => show.pen = false,
+            Home => actions.push(show.state.goto(doc, 0)),
+            End => actions.push(show.state.goto(doc, doc.slides.len().saturating_sub(1))),
+            B | Period => show.blank = if show.blank == Some(Color32::BLACK) { None } else { Some(Color32::BLACK) },
+            W | Comma => show.blank = if show.blank == Some(Color32::WHITE) { None } else { Some(Color32::WHITE) },
+            E => show.strokes.clear(),
+            Num0 | Num1 | Num2 | Num3 | Num4 | Num5 | Num6 | Num7 | Num8 | Num9 => {
+                show.goto.push_str(k.name());
+            }
+            _ => continue,
+        }
+        // The same key must not also activate a focused presenter button or be handled again
+        // by an embedded presenter viewport.
+        ctx.input_mut(|i| i.consume_key(m, k));
+        ctx.request_repaint_of(egui::ViewportId::ROOT);
+    }
+    for action in actions {
+        if !show.apply(action, doc, now) {
+            keep = false;
+        }
+    }
+    keep
+}
+
 pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     let ctx = ui.ctx().clone();
     let Some(doc) = app.session.active().map(|d| d.doc.clone()) else {
@@ -262,58 +324,12 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         }
         show.after_enter(&doc, now);
     }
-    let mut keep = true;
-    // Input.
-    let (keys, clicked, secondary, moved) = ctx.input(|i| {
-        let keys: Vec<(egui::Key, egui::Modifiers)> = i
-            .events
-            .iter()
-            .filter_map(|e| if let egui::Event::Key { key, pressed: true, modifiers, .. } = e { Some((*key, *modifiers)) } else { None })
-            .collect();
-        (keys, i.pointer.primary_clicked(), i.pointer.secondary_clicked(), i.pointer.delta().length() > 0.0)
-    });
+    let mut keep = keyboard(&ctx, &mut show, &doc, now);
+    let (clicked, secondary, moved) = ctx.input(|i| (i.pointer.primary_clicked(), i.pointer.secondary_clicked(), i.pointer.delta().length() > 0.0));
     if moved {
         show.last_move = now;
     }
     let mut actions: Vec<ShowAction> = vec![];
-    for (k, m) in keys {
-        use egui::Key::*;
-        match k {
-            Escape | Minus => keep = false,
-            ArrowRight | ArrowDown | Space | PageDown | N => {
-                if show.ended {
-                    keep = false;
-                } else {
-                    actions.push(show.state.next(&doc));
-                }
-            }
-            Enter => {
-                if let Ok(n) = show.goto.parse::<usize>() {
-                    actions.push(show.state.goto(&doc, n.saturating_sub(1)));
-                    show.goto.clear();
-                } else if show.ended {
-                    keep = false;
-                } else {
-                    actions.push(show.state.next(&doc));
-                }
-            }
-            ArrowLeft | ArrowUp | Backspace | PageUp | P if !(k == P && m.command) => {
-                show.ended = false;
-                actions.push(show.state.prev(&doc));
-            }
-            P if m.command => show.pen = !show.pen,
-            A if m.command => show.pen = false,
-            Home => actions.push(show.state.goto(&doc, 0)),
-            End => actions.push(show.state.goto(&doc, doc.slides.len().saturating_sub(1))),
-            B | Period => show.blank = if show.blank == Some(Color32::BLACK) { None } else { Some(Color32::BLACK) },
-            W | Comma => show.blank = if show.blank == Some(Color32::WHITE) { None } else { Some(Color32::WHITE) },
-            E => show.strokes.clear(),
-            Num0 | Num1 | Num2 | Num3 | Num4 | Num5 | Num6 | Num7 | Num8 | Num9 => {
-                show.goto.push_str(k.name());
-            }
-            _ => {}
-        }
-    }
     let on_slide = !show.pen && !show.ended && show.blank.is_none() && !show.reading_bar_hit(&ctx);
     let gif_click = if clicked && on_slide { gif_hit(&ctx, ui, &show, &doc, app) } else { None };
     let media_click = if clicked && on_slide && gif_click.is_none() { media_hit(&ctx, ui, &show, &doc) } else { None };
@@ -661,7 +677,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         ctx.request_repaint_after(std::time::Duration::from_millis(100));
     }
     // Presenter view in a second window.
-    if show.presenter && !show.reading && !show.ended {
+    if keep && show.presenter && !show.reading {
         presenter_window(&ctx, &mut show, &doc, now, &mut keep);
     }
     if keep {
@@ -794,6 +810,9 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
         egui::ViewportId::from_hash_of("deckcraft_presenter"),
         egui::ViewportBuilder::default().with_title("Presenter View — DeckCraft").with_inner_size([1100.0, 700.0]),
         |ui, _| {
+            if !keyboard(ui.ctx(), show, doc, now) {
+                *keep = false;
+            }
             egui::CentralPanel::default().frame(egui::Frame::NONE.fill(Color32::from_gray(24)).inner_margin(egui::Margin::same(16))).show(ui, |ui| {
                 ui.horizontal(|ui| {
                     ui.label(
@@ -867,6 +886,97 @@ mod tests {
 
     use super::*;
 
+    /// Send real egui key events to the presenter UI, without the audience window's handler.
+    #[test]
+    fn presenter_navigation_uses_its_own_keyboard_events() {
+        use egui_kittest::kittest::Queryable;
+
+        let mut session = deckcraft_engine::Session::with_new();
+        session.execute("slide.new", &json!({})).unwrap();
+        session.execute("slide.new", &json!({})).unwrap();
+        let doc = session.active().unwrap().doc.clone();
+        let show = Show::new(&doc, 0, false, true);
+        let mut harness = egui_kittest::Harness::builder().with_size(vec2(1100.0, 700.0)).build_ui_state(
+            |ui, (doc, show, keep): &mut (std::sync::Arc<Presentation>, Show, bool)| {
+                let now = ui.input(|i| i.time);
+                presenter_window(ui.ctx(), show, doc, now, keep);
+            },
+            (doc, show, true),
+        );
+        harness.run_steps(2);
+        for (key, slide) in [
+            (egui::Key::ArrowRight, 1),
+            (egui::Key::ArrowLeft, 0),
+            (egui::Key::Space, 1),
+            (egui::Key::PageDown, 2),
+            (egui::Key::PageUp, 1),
+            (egui::Key::Home, 0),
+            (egui::Key::End, 2),
+        ] {
+            harness.key_press(key);
+            harness.run_steps(2);
+            assert_eq!(harness.state().1.state.slide, slide, "presenter key {key:?}");
+        }
+        harness.key_press(egui::Key::ArrowRight);
+        harness.run_steps(2);
+        assert!(harness.state().1.ended);
+        harness.key_press(egui::Key::ArrowLeft);
+        harness.run_steps(2);
+        assert!(!harness.state().1.ended);
+        assert_eq!(harness.state().1.state.slide, 2, "back from the end screen restores the last slide");
+        harness.key_press(egui::Key::ArrowRight);
+        harness.run_steps(2);
+        assert!(harness.state().1.ended);
+        harness.get_by_label("◀ Previous").click();
+        harness.run_steps(2);
+        assert!(!harness.state().1.ended, "the presenter Previous button also leaves the end screen");
+        harness.key_press(egui::Key::Home);
+        harness.run_steps(2);
+        harness.get_by_label("Next ▶").click();
+        harness.run_steps(2);
+        assert_eq!(harness.state().1.state.slide, 1);
+        harness.key_press(egui::Key::Space);
+        harness.run_steps(2);
+        assert_eq!(harness.state().1.state.slide, 2);
+        assert!(!harness.state().1.ended, "Space must not also activate the focused Next button");
+        harness.key_press(egui::Key::Escape);
+        harness.run_steps(2);
+        assert!(!harness.state().2, "Escape from Presenter View ends the show");
+    }
+
+    #[test]
+    fn slideshow_navigation_advances_once_with_presenter_view() {
+        use egui_kittest::kittest::Queryable;
+
+        let mut session = deckcraft_engine::Session::with_new();
+        session.execute("slide.new", &json!({})).unwrap();
+        session.execute("slide.new", &json!({})).unwrap();
+        let mut app = SlideApp::new(session, crate::Services::default());
+        app.ui.presenter_view = true;
+        let mut harness = egui_kittest::Harness::builder().with_size(vec2(1000.0, 700.0)).build_ui_state(
+            |ui, app: &mut SlideApp| {
+                app.logic(ui.ctx());
+                app.ui(ui);
+            },
+            app,
+        );
+        harness.run_steps(3);
+        harness.state_mut().start_show(0, false);
+        harness.run_steps(2);
+        harness.key_press(egui::Key::ArrowRight);
+        harness.run_steps(2);
+        assert_eq!(harness.state().show.as_ref().unwrap().state.slide, 1, "one key advances one slide");
+        harness.key_press(egui::Key::End);
+        harness.run_steps(2);
+        harness.key_press(egui::Key::ArrowRight);
+        harness.run_steps(2);
+        assert!(harness.state().show.as_ref().unwrap().ended);
+        assert!(harness.query_by_label("End Show").is_some(), "the presenter remains available at the end screen");
+        harness.key_press(egui::Key::Escape);
+        harness.run_steps(2);
+        assert!(harness.state().show.is_none());
+    }
+
     #[test]
     fn a_transition_keeps_the_old_slide_in_its_own_texture() {
         // #33: the old slide's handle was cloned, so the new slide was rendered into the same
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index fd981595..8b8cdcc2 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (keyboard navigation from Presenter View) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -39,6 +39,7 @@ ready** (estimated), **10–16 h** to parity.
 | Elapsed timer | yes | yes | |
 | Pause / reset timer, clock | yes | no | |
 | Slide counter, previous/next/end buttons | yes | yes | |
+| Keyboard navigation while Presenter View has focus | yes | yes | Shares the audience window's key handling; handled keys are consumed before buttons, and the presenter stays available at the end screen |
 | Notes font size, scrolling | yes | scrolling only | |
 | Placed on the presenter's display automatically, show on the projector | yes | **no**: opens wherever the OS puts it | Beta blocker, 3–5 h |
 | Swap displays | yes | no | |
@@ -73,4 +74,5 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Presenter View handles slideshow keys in its own viewport, including returning from the end screen and Escape; regression tests cover navigation and avoiding duplicate button activation |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |

From 887ea1e7068eaadc85429bc267957975aff85acb Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Wed, 14 Oct 2026 07:34:17 +0900
Subject: [PATCH 303/376] Slide show: click-triggered animations, per-slide
 state and hit testing

Make the slide show behave like PowerPoint for interactive decks.

- Hit testing resolves the topmost visible shape under the pointer.
  Non-interactive shapes block shapes beneath them; the hand cursor
  shows only over interactive shapes.
- Click-triggered animations (interactive sequences) play on shape
  click, repeat after their last step, and apply in click order so
  cycling "score ring" shapes work.
- Each slide keeps its own progress: returning to a slide through a
  link or Back restores hidden shapes and animation state.
- A shape with a link and an animation follows the link immediately;
  its animation clock only runs while the slide is shown and resumes
  with the remaining time on return.
- With advance-on-click off, background clicks still play animation
  steps but never change slide.
- A click on a playing step completes it at once.

Docs (gaps, animation and slide show parity, roadmap) are updated.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
---
 Cargo.lock                         |   1 +
 ROADMAP.md                         |   2 +
 crates/anim/src/interact.rs        | 266 +++++++++++++++++++++
 crates/anim/src/lib.rs             |   9 +-
 crates/anim/src/show.rs            |  56 ++++-
 crates/anim/src/tests_interact.rs  | 364 +++++++++++++++++++++++++++++
 crates/anim/src/timeline.rs        |  36 ++-
 crates/engine/Cargo.toml           |   3 +
 crates/engine/tests/show_clicks.rs | 236 +++++++++++++++++++
 crates/render/src/lib.rs           |   2 +-
 crates/render/src/placed.rs        |  53 ++++-
 crates/render/src/tests.rs         |  51 ++++
 crates/ui-egui/src/show.rs         | 153 ++++++++++--
 docs/animation-parity.md           |   5 +-
 docs/gaps.md                       |  17 +-
 docs/slideshow-parity.md           |   6 +-
 16 files changed, 1210 insertions(+), 50 deletions(-)
 create mode 100644 crates/anim/src/interact.rs
 create mode 100644 crates/anim/src/tests_interact.rs
 create mode 100644 crates/engine/tests/show_clicks.rs

diff --git a/Cargo.lock b/Cargo.lock
index 4044fce6..84372937 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -939,6 +939,7 @@ dependencies = [
 name = "deckcraft-engine"
 version = "0.6.1"
 dependencies = [
+ "deckcraft-anim",
  "deckcraft-color",
  "deckcraft-fonts",
  "deckcraft-format",
diff --git a/ROADMAP.md b/ROADMAP.md
index 46a87add..719a0dbc 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -131,6 +131,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
+| 2026-10-13 | Slide show for interactive decks: click-triggered animations play (one step per click, repeating, applied in click order), a slide the show returns to keeps its state and its triggered animations go on where they stopped, shapes an animation has hidden cannot be clicked, a shape without an action blocks the one beneath it, hand cursor over clickable shapes, "advance on click" off respected |
 | 2026-10-12 | Objects off the slide show and can be selected and moved around it in Normal view, as in PowerPoint; the show, exports and thumbnails still clip to the slide (#270) |
 | 2026-10-12 | Korean, Japanese and Chinese input: IME composition shown in place and underlined, one undo step per composition, candidate window at the caret (slide text, notes, fields); interface text (title, notes, outline, sections, comments) borrows installed fonts for scripts the interface fonts lack (#101) |
 | 2026-10-12 | Selection Pane like PowerPoint (#133): front-most first, groups fold, drag and drop restacks among siblings, Bring Forward / Send Backward, Show All / Hide All, eye, rename in place, keyboard; Lock (pane padlock, canvas menu) keeps objects from moving, sizing or rotating and round-trips PowerPoint's locking attributes |
@@ -151,6 +152,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | Date | Change | Summary |
 |---|---|---|
 | 2026-10-13 | trivial | Progress log: wild text cases |
+| 2026-10-13 | trivial | Progress log: slide show for interactive decks |
 | 2026-10-12 | trivial | Progress log: File tab (Backstage, #76) |
 | 2026-10-12 | trivial | Progress log: lines in scaled groups (#233) |
 | 2026-10-10 | minor | Readiness-by-audience table with hours to ~95% for full, mainstream and essentials |
diff --git a/crates/anim/src/interact.rs b/crates/anim/src/interact.rs
new file mode 100644
index 00000000..e32d980e
--- /dev/null
+++ b/crates/anim/src/interact.rs
@@ -0,0 +1,266 @@
+//! Clicks in a slide show: which shape a click lands on, what it starts (a triggered animation, a
+//! link, the next step) and what the show remembers about each slide it has visited.
+//!
+//! The rules follow PowerPoint, as observed on its slide show:
+//! - the topmost visible shape under the pointer decides; a shape without an action on top of one
+//!   with an action blocks it (the click then counts as a click on the background);
+//! - a shape with a triggered animation plays the next step of it per click, and starts over once all
+//!   its steps have played; clicking it while a step plays completes the step at once;
+//! - a shape with a link and a triggered animation follows the link at once. The animation's clock
+//!   runs only while its slide is shown, so it goes on where it stopped when the show returns;
+//! - with "advance on click" off a click never leaves the slide, but it still plays animation steps;
+//! - a slide the show returns to (link or arrow keys) looks as it was left.
+
+use deckcraft_model::text::Action;
+use deckcraft_model::{Presentation, ShapeId};
+
+use crate::{AnimState, LinkJump, ShowAction, ShowState, StepStamp, Timeline, TriggerPlay};
+
+/// What was played on one slide.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub(crate) struct SlideRun {
+    /// The show has been on this slide.
+    pub visited: bool,
+    /// Main-sequence steps played when the show left the slide.
+    pub step: usize,
+    /// Triggered sequences started by clicks.
+    pub triggers: Vec<TriggerRun>,
+    /// Steps of triggered sequences started so far (the stamps of [`StepStamp`]).
+    pub clock: u64,
+}
+
+/// Progress of one triggered sequence.
+#[derive(Clone, Debug, PartialEq)]
+pub(crate) struct TriggerRun {
+    pub shape: ShapeId,
+    /// Clicks whose step has played to its end.
+    pub done: usize,
+    /// Seconds the current step has played; `None` when no step is playing.
+    pub elapsed: Option<f64>,
+    /// When each step of this run was started, by step.
+    pub stamps: Vec<u64>,
+}
+
+/// One shape of the slide for hit testing, in drawing order (back to front; a group before its
+/// children), with whether the pointer is inside its box.
+#[derive(Clone, Debug, PartialEq)]
+pub struct HitShape {
+    pub id: ShapeId,
+    /// Index of the enclosing group in the same list.
+    pub parent: Option<usize>,
+    pub is_group: bool,
+    /// The shape's own action.
+    pub link: Option<Action>,
+    pub under_pointer: bool,
+}
+
+/// What the pointer is over: a shape that does something when clicked.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Target {
+    pub shape: ShapeId,
+    pub link: Option<Action>,
+}
+
+/// What a click did.
+#[derive(Clone, Debug, PartialEq)]
+pub enum Click {
+    /// Nothing happened.
+    None,
+    /// A triggered animation started or was completed: redraw.
+    Animated,
+    /// Navigation inside the show (already applied to the state).
+    Show(ShowAction),
+    /// Open this URL outside the show.
+    Open(String),
+    /// End the show.
+    Exit,
+}
+
+impl From<LinkJump> for Click {
+    fn from(j: LinkJump) -> Click {
+        match j {
+            LinkJump::Show(a) => Click::Show(a),
+            LinkJump::Open(u) => Click::Open(u),
+            LinkJump::Exit => Click::Exit,
+            LinkJump::None => Click::None,
+        }
+    }
+}
+
+fn finite_or_zero(v: f64) -> f64 {
+    if v.is_finite() { v } else { 0.0 }
+}
+
+impl ShowState {
+    fn animated(&self, pres: &Presentation) -> bool {
+        !pres.show.without_animation
+    }
+
+    /// Does clicking `shape` start a triggered sequence? A sequence can be started again once it has
+    /// played to its end.
+    fn trigger_live(&self, pres: &Presentation, tl: &Timeline, shape: ShapeId) -> bool {
+        self.animated(pres) && tl.trigger_steps(shape) > 0
+    }
+
+    /// The playheads of the current slide's triggered sequences at the last tick, for
+    /// [`Timeline::state_with`].
+    pub fn trigger_plays(&self) -> Vec<TriggerPlay> {
+        match self.runs.get(&self.slide) {
+            Some(r) => r.triggers.iter().map(|t| TriggerPlay { trigger: t.shape, step: t.done, t: t.elapsed.unwrap_or(0.0) }).collect(),
+            None => vec![],
+        }
+    }
+
+    /// When the steps of the current slide's triggered sequences were started.
+    pub fn trigger_stamps(&self) -> Vec<StepStamp> {
+        let Some(r) = self.runs.get(&self.slide) else { return vec![] };
+        r.triggers.iter().flat_map(|t| t.stamps.iter().enumerate().map(|(step, &at)| StepStamp { trigger: t.shape, step, at })).collect()
+    }
+
+    /// Is a triggered animation of the current slide playing (so the picture changes every frame)?
+    pub fn trigger_playing(&self) -> bool {
+        self.runs.get(&self.slide).is_some_and(|r| r.triggers.iter().any(|t| t.elapsed.is_some()))
+    }
+
+    /// Animation state of `shape` on the current slide: main step `step` with `t_main` seconds
+    /// played, plus the triggered sequences.
+    pub fn anim_state(&self, tl: &Timeline, shape: ShapeId, t_main: f64) -> AnimState {
+        tl.state_ordered(shape, None, self.step, t_main, &self.trigger_plays(), &self.trigger_stamps())
+    }
+
+    /// Advance the clock of the playing triggered animations to `now` (seconds, any steady clock)
+    /// and complete the steps that reached their end. [`Click::Animated`] when the picture changed.
+    pub fn tick(&mut self, tl: &Timeline, now: f64) -> Click {
+        let dt = match self.last_now {
+            Some(last) if now.is_finite() => (now - last).clamp(0.0, 3600.0),
+            _ => 0.0,
+        };
+        if now.is_finite() {
+            self.last_now = Some(now);
+        }
+        let Some(run) = self.runs.get_mut(&self.slide) else { return Click::None };
+        let mut changed = false;
+        for t in run.triggers.iter_mut() {
+            let Some(e) = t.elapsed else { continue };
+            let e = finite_or_zero(e) + dt;
+            if e >= tl.trigger_step_duration(t.shape, t.done) {
+                t.done += 1;
+                t.elapsed = None;
+                changed = true;
+            } else {
+                t.elapsed = Some(e);
+            }
+        }
+        if changed { Click::Animated } else { Click::None }
+    }
+
+    /// Index of the topmost shape a click lands on: the front-most one under the pointer that is
+    /// shown. A group without an action does not count; its children and the space inside its box
+    /// are not it.
+    pub fn top(&self, pres: &Presentation, tl: &Timeline, shapes: &[HitShape], visible: &dyn Fn(ShapeId) -> bool) -> Option<usize> {
+        let shown = |mut i: usize| -> bool {
+            // A shape is shown when it and the groups around it are.
+            for _ in 0..=shapes.len() {
+                let Some(h) = shapes.get(i) else { return false };
+                if !visible(h.id) {
+                    return false;
+                }
+                match h.parent {
+                    Some(p) => i = p,
+                    None => return true,
+                }
+            }
+            false
+        };
+        (0..shapes.len())
+            .rev()
+            .find(|&i| shapes.get(i).is_some_and(|h| h.under_pointer && !(h.is_group && !self.interactive(pres, tl, h)) && shown(i)))
+    }
+
+    fn interactive(&self, pres: &Presentation, tl: &Timeline, h: &HitShape) -> bool {
+        h.link.is_some() || self.trigger_live(pres, tl, h.id)
+    }
+
+    /// The shape under the pointer that a click would act on, `None` when a click would be a click
+    /// on the background. `visible` tells whether a shape is currently shown (not yet entered or
+    /// already exited shapes cannot be clicked).
+    pub fn target(&self, pres: &Presentation, tl: &Timeline, shapes: &[HitShape], visible: &dyn Fn(ShapeId) -> bool) -> Option<Target> {
+        // The topmost shape, or the group it is in, that has an action. A shape without one blocks
+        // what lies beneath it.
+        let mut at = self.top(pres, tl, shapes, visible);
+        for _ in 0..=shapes.len() {
+            let h = shapes.get(at?)?;
+            if self.interactive(pres, tl, h) {
+                return Some(Target { shape: h.id, link: h.link.clone() });
+            }
+            at = h.parent;
+        }
+        None
+    }
+
+    /// A mouse click. `shapes` and `visible` describe what is under the pointer (see
+    /// [`ShowState::target`]); `last_viewed` is the slide shown before this one.
+    pub fn click(
+        &mut self,
+        pres: &Presentation,
+        tl: &Timeline,
+        shapes: &[HitShape],
+        visible: &dyn Fn(ShapeId) -> bool,
+        now: f64,
+        last_viewed: Option<usize>,
+    ) -> Click {
+        self.tick(tl, now);
+        if self.ended {
+            return Click::None;
+        }
+        let Some(t) = self.target(pres, tl, shapes, visible) else { return self.background_click(pres) };
+        let mut animated = false;
+        if self.trigger_live(pres, tl, t.shape) {
+            let slide = self.slide;
+            let run = self.runs.entry(slide).or_default();
+            let at = match run.triggers.iter().position(|r| r.shape == t.shape) {
+                Some(p) => p,
+                None => {
+                    run.triggers.push(TriggerRun { shape: t.shape, done: 0, elapsed: None, stamps: vec![] });
+                    run.triggers.len() - 1
+                }
+            };
+            let stamp = run.clock.saturating_add(1);
+            if let Some(r) = run.triggers.get_mut(at) {
+                if r.elapsed.is_some() {
+                    // A click on a shape whose step is playing completes the step.
+                    r.done += 1;
+                    r.elapsed = None;
+                } else {
+                    if r.done >= tl.trigger_steps(t.shape) {
+                        // All steps have played: the sequence starts over.
+                        r.done = 0;
+                        r.stamps.clear();
+                    }
+                    r.stamps.push(stamp);
+                    run.clock = stamp;
+                    if tl.trigger_step_duration(t.shape, r.done) > 0.0 {
+                        r.elapsed = Some(0.0);
+                    } else {
+                        r.done += 1;
+                    }
+                }
+                animated = true;
+            }
+        }
+        match t.link {
+            // The link is followed at once, whatever the animation still has to play.
+            Some(a) => self.follow(pres, &a, last_viewed).into(),
+            None if animated => Click::Animated,
+            None => Click::None,
+        }
+    }
+
+    /// A click that is on no shape with an action: next animation step, then next slide, unless the
+    /// slide has "advance on click" off, which leaves only the animation steps.
+    fn background_click(&mut self, pres: &Presentation) -> Click {
+        let advance = pres.slides.get(self.slide).and_then(|s| s.transition.as_ref()).is_none_or(|t| t.advance_on_click);
+        let steps_left = self.playing || self.step < ShowState::steps(pres, self.slide);
+        if advance || steps_left { Click::Show(self.next(pres)) } else { Click::None }
+    }
+}
diff --git a/crates/anim/src/lib.rs b/crates/anim/src/lib.rs
index d94167ca..8522a774 100644
--- a/crates/anim/src/lib.rs
+++ b/crates/anim/src/lib.rs
@@ -5,7 +5,8 @@
 //! - [`transition_layers`]: a slide transition frame as textured quads of the old/new slide images.
 //! - [`morph_frame`]: a Morph transition frame (shapes matched by [`morph_pairs`], moved by
 //!   [`morph_xfrm`]).
-//! - [`ShowState`]: slide show navigation (hidden slides, custom shows, loop, timings).
+//! - [`ShowState`]: slide show navigation (hidden slides, custom shows, loop, timings), what was
+//!   played on each visited slide, and what a click does ([`ShowState::click`]).
 //!
 //! Pure logic: no rendering, no UI toolkit. Every function accepts hostile numbers (NaN, huge or
 //! negative times) and never panics.
@@ -14,6 +15,7 @@
 
 mod easing;
 mod effects;
+mod interact;
 mod mesh;
 mod morph;
 mod path;
@@ -26,17 +28,20 @@ mod transition_geom;
 #[cfg(test)]
 mod tests;
 #[cfg(test)]
+mod tests_interact;
+#[cfg(test)]
 mod transition_tests;
 
 pub use deckcraft_model::Rgba;
 use serde::{Deserialize, Serialize};
 
 pub use easing::ease;
+pub use interact::{Click, HitShape, Target};
 pub use mesh::{MeshVertex, layer_mesh};
 pub use morph::{MorphFrame, MorphPath, MorphText, morph_frame, morph_pairs, morph_xfrm};
 pub use path::{MotionPath, default_path};
 pub use show::{LinkJump, ShowAction, ShowState, safe_url, show_order};
-pub use timeline::{EffectTiming, Sequence, Timeline, TriggerPlay};
+pub use timeline::{EffectTiming, Sequence, StepStamp, Timeline, TriggerPlay};
 pub use transition::{DEFAULT_ASPECT, Layer, Source, transition_frame, transition_layers, uses_slide_parts};
 
 /// Animation state of one shape (or one paragraph of a shape's text) at one moment of the show.
diff --git a/crates/anim/src/show.rs b/crates/anim/src/show.rs
index dbc0a8ae..4fc0d5e1 100644
--- a/crates/anim/src/show.rs
+++ b/crates/anim/src/show.rs
@@ -1,10 +1,13 @@
 //! Slide show navigation: click steps, slide order (hidden slides, custom shows, ranges), loop
 //! and automatic advance.
 
+use std::collections::BTreeMap;
+
 use deckcraft_model::Presentation;
 use deckcraft_model::text::Action;
 
 use crate::Timeline;
+use crate::interact::SlideRun;
 
 /// What the UI should do after a navigation call.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -52,8 +55,10 @@ pub enum LinkJump {
     None,
 }
 
-/// Where a slide show is.
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+/// Where a slide show is. Besides the current position it remembers what was played on every slide
+/// the show has visited (main steps, triggered sequences), so a slide reached again by a link or
+/// the arrow keys looks the way it was left, as in PowerPoint.
+#[derive(Clone, Debug, PartialEq, Default)]
 pub struct ShowState {
     /// Index into `presentation.slides`.
     pub slide: usize,
@@ -63,6 +68,12 @@ pub struct ShowState {
     pub playing: bool,
     /// On the end screen.
     pub ended: bool,
+    /// The show has entered a slide (so `slide` and `step` are meaningful and can be saved).
+    active: bool,
+    /// The time of the last [`ShowState::tick`] (seconds), for the triggered animations' clocks.
+    pub(crate) last_now: Option<f64>,
+    /// What was played on each visited slide (index into `presentation.slides`).
+    pub(crate) runs: BTreeMap<usize, SlideRun>,
 }
 
 /// Slide indices the show visits in order: the custom show or range from Set Up Slide Show, minus
@@ -120,11 +131,37 @@ impl ShowState {
         if pres.show.without_animation { 0 } else { ShowState::timeline(pres, i).steps() }
     }
 
+    /// Save what was played on the current slide before the show moves away from it. A main step
+    /// that is playing is taken to its end. Triggered animations keep their place: their clock only
+    /// runs while the slide is shown, and they go on from there when the show comes back.
+    fn leave(&mut self, pres: &Presentation) {
+        if !self.active {
+            return;
+        }
+        let done = if self.playing { self.step + 1 } else { self.step };
+        let step = done.min(ShowState::steps(pres, self.slide));
+        self.runs.entry(self.slide).or_default().step = step;
+        self.playing = false;
+    }
+
+    /// Show slide `i`: as it was left when the show has been there before, otherwise from the start.
     fn enter(&mut self, pres: &Presentation, i: usize) {
+        self.leave(pres);
+        self.active = true;
         self.slide = i;
-        self.step = 0;
         self.ended = false;
-        self.playing = !pres.show.without_animation && ShowState::timeline(pres, i).step_is_auto(0);
+        // Time spent elsewhere never counts for this slide's triggered animations.
+        self.last_now = None;
+        let steps = ShowState::steps(pres, i);
+        let run = self.runs.entry(i).or_default();
+        if run.visited {
+            self.step = run.step.min(steps);
+            self.playing = false;
+        } else {
+            run.visited = true;
+            self.step = 0;
+            self.playing = !pres.show.without_animation && ShowState::timeline(pres, i).step_is_auto(0);
+        }
     }
 
     fn next_index(&self, pres: &Presentation) -> Option<usize> {
@@ -220,9 +257,14 @@ impl ShowState {
         };
         match target {
             Some(i) => {
-                self.slide = i;
-                self.step = ShowState::steps(pres, i);
-                self.playing = false;
+                // A slide the show has been to looks as it was left; one it has not been to is
+                // shown fully built.
+                let seen = self.runs.get(&i).is_some_and(|r| r.visited);
+                self.enter(pres, i);
+                if !seen {
+                    self.step = ShowState::steps(pres, i);
+                    self.playing = false;
+                }
                 ShowAction::Slide(i)
             }
             None => ShowAction::None,
diff --git a/crates/anim/src/tests_interact.rs b/crates/anim/src/tests_interact.rs
new file mode 100644
index 00000000..5f12dda5
--- /dev/null
+++ b/crates/anim/src/tests_interact.rs
@@ -0,0 +1,364 @@
+//! Clicks, triggered animations and what the show remembers about visited slides.
+#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
+
+use std::sync::Arc;
+
+use deckcraft_model::text::Action;
+use deckcraft_model::{AnimClass, AnimStart, Animation, Presentation, Shape, ShapeId, Slide, SlideId, Transition, Xfrm};
+
+use crate::*;
+
+fn shape(id: u32) -> Shape {
+    Shape { id: ShapeId(id), name: format!("S{id}"), xfrm: Some(Xfrm::new(100.0, 100.0, 200.0, 100.0)), ..Default::default() }
+}
+
+/// A triggered exit (`Disappear` when `ms` is 0, else a fade out) of `target`, started by clicking `trigger`.
+fn exit_on_click(trigger: u32, target: u32, ms: u32) -> Animation {
+    let effect = if ms == 0 { "disappear" } else { "fadeOut" };
+    Animation {
+        shape: ShapeId(target),
+        class: AnimClass::Exit,
+        effect: effect.into(),
+        start: AnimStart::OnClick,
+        duration_ms: ms,
+        trigger: Some(ShapeId(trigger)),
+        ..Default::default()
+    }
+}
+
+fn slide(id: u32, shapes: Vec<Shape>, animations: Vec<Animation>, advance_on_click: bool) -> Arc<Slide> {
+    let transition = (!advance_on_click).then(|| Transition { advance_on_click: false, ..Default::default() });
+    Arc::new(Slide { id: SlideId(id), shapes, animations, transition, ..Default::default() })
+}
+
+fn to_slide(n: u32) -> Option<Action> {
+    Some(Action::Slide { slide: SlideId(n) })
+}
+
+fn hit(id: u32, link: Option<Action>) -> HitShape {
+    HitShape { id: ShapeId(id), parent: None, is_group: false, link, under_pointer: true }
+}
+
+/// Test driver: a show plus the click helpers the slide show window uses.
+struct Run {
+    pres: Presentation,
+    show: ShowState,
+    /// Hit shapes of each slide, back to front.
+    hits: Vec<Vec<HitShape>>,
+    now: f64,
+}
+
+impl Run {
+    fn new(pres: Presentation, hits: Vec<Vec<HitShape>>) -> Run {
+        let show = ShowState::new(&pres);
+        Run { pres, show, hits, now: 0.0 }
+    }
+
+    fn tl(&self) -> Timeline {
+        ShowState::timeline(&self.pres, self.show.slide)
+    }
+
+    fn visible(&self, id: ShapeId) -> bool {
+        let st = self.show.anim_state(&self.tl(), id, 0.0);
+        st.visible && st.opacity > 0.0
+    }
+
+    fn opacity(&self, id: u32) -> f64 {
+        self.show.anim_state(&self.tl(), ShapeId(id), 0.0).opacity
+    }
+
+    fn click(&mut self) -> Click {
+        let (tl, hits) = (self.tl(), self.hits[self.show.slide].clone());
+        let vis: Vec<(ShapeId, bool)> = hits.iter().map(|h| (h.id, self.visible(h.id))).collect();
+        let visible = move |id: ShapeId| vis.iter().find(|v| v.0 == id).is_none_or(|v| v.1);
+        self.show.click(&self.pres, &tl, &hits, &visible, self.now, None)
+    }
+
+    fn target(&self) -> Option<Target> {
+        let (tl, hits) = (self.tl(), &self.hits[self.show.slide]);
+        self.show.target(&self.pres, &tl, hits, &|id| self.visible(id))
+    }
+
+    /// Let `secs` pass on the shown slide, in small frames.
+    fn wait(&mut self, secs: f64) {
+        let end = self.now + secs;
+        while self.now < end - 1e-9 {
+            self.now = (self.now + 0.05).min(end);
+            let tl = self.tl();
+            self.show.tick(&tl, self.now);
+        }
+    }
+}
+
+/// The test deck: slide 1 has a text box (3), a linked button that also disappears (2) and a
+/// picture on top of both that disappears (4); slide 2 has a button back to slide 1.
+fn two_slides(advance_on_click: bool) -> Run {
+    let s1 = slide(1000, vec![shape(3), shape(2), shape(4)], vec![exit_on_click(4, 4, 0), exit_on_click(2, 2, 0)], advance_on_click);
+    let s2 = slide(1001, vec![shape(1)], vec![], advance_on_click);
+    let pres = Presentation { slides: vec![s1, s2], ..Default::default() };
+    Run::new(pres, vec![vec![hit(3, None), hit(2, to_slide(1001)), hit(4, None)], vec![hit(1, to_slide(1000))]])
+}
+
+#[test]
+fn hidden_shapes_stay_hidden_when_the_show_comes_back() {
+    let mut r = two_slides(false);
+    assert_eq!(r.target().map(|t| t.shape), Some(ShapeId(4)), "the picture is on top");
+    // Click the picture: it disappears; the button beneath it is now the target.
+    assert_eq!(r.click(), Click::Animated);
+    assert!(!r.visible(ShapeId(4)));
+    assert_eq!(r.target().map(|t| t.shape), Some(ShapeId(2)));
+    // Click the button: its animation starts and the link is followed.
+    assert_eq!(r.click(), Click::Show(ShowAction::Slide(1)));
+    assert_eq!(r.show.slide, 1);
+    // Slide 2: the button goes back.
+    assert_eq!(r.click(), Click::Show(ShowAction::Slide(0)));
+    assert_eq!(r.show.slide, 0);
+    // Both are still gone, and nothing on the slide can be clicked any more.
+    assert!(!r.visible(ShapeId(4)) && !r.visible(ShapeId(2)) && r.visible(ShapeId(3)));
+    assert_eq!(r.target(), None);
+    // "Advance on click" is off: a click anywhere does nothing, however often.
+    for _ in 0..3 {
+        assert_eq!(r.click(), Click::None);
+    }
+    assert_eq!(r.show.slide, 0);
+}
+
+#[test]
+fn background_click_advances_when_the_slide_allows_it() {
+    let mut r = two_slides(true);
+    r.click(); // the picture disappears
+    r.click(); // the button disappears and links to slide 2
+    r.click(); // the button there links back
+    assert_eq!(r.show.slide, 0);
+    assert_eq!(r.target(), None);
+    assert_eq!(r.click(), Click::Show(ShowAction::Slide(1)));
+}
+
+#[test]
+fn advance_on_click_off_still_plays_animation_steps() {
+    let main = Animation { shape: ShapeId(1), class: AnimClass::Entrance, effect: "fade".into(), duration_ms: 500, ..Default::default() };
+    let s1 = slide(1000, vec![shape(1)], vec![main], false);
+    let s2 = slide(1001, vec![], vec![], false);
+    let pres = Presentation { slides: vec![s1, s2], ..Default::default() };
+    let mut r = Run::new(pres, vec![vec![hit(1, None)], vec![]]);
+    // The first click plays the step, the next finishes it; then the slide stays.
+    assert!(matches!(r.click(), Click::Show(ShowAction::PlayStep(0))));
+    assert!(matches!(r.click(), Click::Show(ShowAction::FinishStep(0))));
+    assert_eq!(r.click(), Click::None);
+    assert_eq!(r.show.slide, 0);
+    // The arrow keys still move on.
+    assert_eq!(r.show.next(&r.pres), ShowAction::Slide(1));
+}
+
+#[test]
+fn a_shape_without_an_action_blocks_the_one_beneath_it() {
+    let s = slide(1000, vec![shape(1), shape(2)], vec![], true);
+    let pres = Presentation { slides: vec![s, slide(1001, vec![], vec![], true)], ..Default::default() };
+    let mut r = Run::new(pres, vec![vec![hit(1, to_slide(1001)), hit(2, None)], vec![]]);
+    assert_eq!(r.target(), None, "the plain shape on top blocks the button");
+    // So the click is a background click, not the button's link.
+    assert_eq!(r.click(), Click::Show(ShowAction::Slide(1)));
+    // Reversed, the button is on top and is the target.
+    let s = slide(1000, vec![shape(2), shape(1)], vec![], true);
+    let pres = Presentation { slides: vec![s, slide(1001, vec![], vec![], true)], ..Default::default() };
+    let r = Run::new(pres, vec![vec![hit(2, None), hit(1, to_slide(1001))], vec![]]);
+    assert_eq!(r.target().map(|t| t.shape), Some(ShapeId(1)));
+}
+
+#[test]
+fn groups_answer_for_their_children() {
+    let s = slide(1000, vec![shape(1)], vec![], true);
+    let pres = Presentation { slides: vec![s, slide(1001, vec![], vec![], true)], ..Default::default() };
+    let group = |link| HitShape { id: ShapeId(10), parent: None, is_group: true, link, under_pointer: true };
+    let child = HitShape { id: ShapeId(11), parent: Some(1), is_group: false, link: None, under_pointer: true };
+    // A child of a group with an action acts as the group.
+    let r = Run::new(pres.clone(), vec![vec![hit(5, None), group(to_slide(1001)), child.clone()], vec![]]);
+    assert_eq!(r.target().map(|t| t.shape), Some(ShapeId(10)));
+    // Empty space inside the box of a group without an action blocks nothing.
+    let behind = hit(5, to_slide(1001));
+    let r = Run::new(pres, vec![vec![behind, group(None)], vec![]]);
+    assert_eq!(r.target().map(|t| t.shape), Some(ShapeId(5)));
+}
+
+#[test]
+fn pointer_outside_a_shape_is_not_on_it() {
+    let s = slide(1000, vec![shape(1)], vec![], true);
+    let pres = Presentation { slides: vec![s], ..Default::default() };
+    let mut h = hit(1, to_slide(1000));
+    h.under_pointer = false;
+    let r = Run::new(pres, vec![vec![h]]);
+    assert_eq!(r.target(), None);
+}
+
+#[test]
+fn each_click_plays_one_step_of_a_trigger_and_a_click_completes_a_playing_step() {
+    // Clicking shape 1 fades shape 2 out over 5 s, then shape 3 over 5 s.
+    let s = slide(1000, vec![shape(1), shape(2), shape(3)], vec![exit_on_click(1, 2, 5000), exit_on_click(1, 3, 5000)], true);
+    let pres = Presentation { slides: vec![s], ..Default::default() };
+    let mut r = Run::new(pres, vec![vec![hit(2, None), hit(3, None), hit(1, None)]]);
+    assert_eq!(r.target().map(|t| t.shape), Some(ShapeId(1)));
+    assert_eq!(r.click(), Click::Animated);
+    r.wait(2.0);
+    assert!(r.show.trigger_playing());
+    assert!(r.opacity(2) < 1.0 && r.opacity(2) > 0.0, "part way through the fade");
+    assert!(r.visible(ShapeId(3)));
+    // A click on the shape while its step plays completes the step at once...
+    assert_eq!(r.click(), Click::Animated);
+    assert!(!r.visible(ShapeId(2)) && !r.show.trigger_playing());
+    // ...and the next click plays the next step.
+    assert_eq!(r.click(), Click::Animated);
+    r.wait(5.2);
+    assert!(!r.visible(ShapeId(3)));
+    // All steps have played, and the shape still answers: its sequence starts over.
+    assert_eq!(r.target().map(|t| t.shape), Some(ShapeId(1)));
+    assert_eq!(r.click(), Click::Animated);
+    assert!(r.visible(ShapeId(2)) && r.visible(ShapeId(3)), "the first lap's effects are undone");
+    r.wait(5.2);
+    assert!(!r.visible(ShapeId(2)) && r.visible(ShapeId(3)));
+}
+
+#[test]
+fn a_ring_of_triggers_goes_round_and_round() {
+    // Soccer's score: clicking shape k hides it and shows shape k+1; the last shows the first again.
+    let ring = 4u32;
+    let anims: Vec<Animation> = (1..=ring)
+        .flat_map(|k| {
+            let next = k % ring + 1;
+            let show = Animation {
+                shape: ShapeId(next),
+                class: AnimClass::Entrance,
+                effect: "appear".into(),
+                start: AnimStart::WithPrevious,
+                duration_ms: 0,
+                trigger: Some(ShapeId(k)),
+                ..Default::default()
+            };
+            [exit_on_click(k, k, 0), show]
+        })
+        .collect();
+    let shapes: Vec<Shape> = (1..=ring).map(shape).collect();
+    let s = slide(1000, shapes, anims, true);
+    let pres = Presentation { slides: vec![s], ..Default::default() };
+    let hits: Vec<HitShape> = (1..=ring).map(|k| hit(k, None)).collect();
+    let mut r = Run::new(pres, vec![hits]);
+    let showing = |r: &Run| -> Vec<u32> { (1..=ring).filter(|k| r.visible(ShapeId(*k))).collect() };
+    assert_eq!(showing(&r), vec![1]);
+    for lap in 0..3 {
+        for k in 1..=ring {
+            assert_eq!(showing(&r), vec![k], "lap {lap}, before click {k}");
+            assert_eq!(r.target().map(|t| t.shape), Some(ShapeId(k)));
+            assert_eq!(r.click(), Click::Animated);
+        }
+    }
+    assert_eq!(showing(&r), vec![1]);
+}
+
+#[test]
+fn a_link_is_followed_at_once_and_the_animation_goes_on_where_it_stopped() {
+    // Shape 1 fades shape 4 over 5 s; shape 2 links to slide 2.
+    let s1 = slide(1000, vec![shape(1), shape(2), shape(4)], vec![exit_on_click(1, 4, 5000)], false);
+    let s2 = slide(1001, vec![shape(5)], vec![], false);
+    let pres = Presentation { slides: vec![s1, s2], ..Default::default() };
+    let mut r = Run::new(pres, vec![vec![hit(4, None), hit(2, to_slide(1001)), hit(1, None)], vec![hit(5, to_slide(1000))]]);
+    // Click the animated shape, wait 2 s, click the link.
+    r.click();
+    r.wait(2.0);
+    assert_eq!(r.show.trigger_plays()[0].t.round(), 2.0);
+    // The second shape is not over the first one, so click the link directly.
+    let tl = r.tl();
+    let hits = vec![hit(2, to_slide(1001))];
+    assert_eq!(r.show.click(&r.pres, &tl, &hits, &|_| true, r.now, None), Click::Show(ShowAction::Slide(1)));
+    // However long the show stays away, the animation does not run.
+    r.wait(60.0);
+    assert_eq!(r.click(), Click::Show(ShowAction::Slide(0)));
+    // Back on the slide it has 3 s left.
+    assert!((r.show.trigger_plays()[0].t - 2.0).abs() < 0.1);
+    assert!(r.show.trigger_playing());
+    r.wait(2.5);
+    assert!(r.show.trigger_playing() && r.opacity(4) > 0.0);
+    r.wait(1.0);
+    assert!(!r.show.trigger_playing() && !r.visible(ShapeId(4)));
+}
+
+#[test]
+fn a_shape_with_a_link_and_an_animation_follows_the_link_without_waiting() {
+    let s1 = slide(1000, vec![shape(2)], vec![exit_on_click(2, 2, 5000)], false);
+    let s2 = slide(1001, vec![shape(5)], vec![], false);
+    let pres = Presentation { slides: vec![s1, s2], ..Default::default() };
+    let mut r = Run::new(pres, vec![vec![hit(2, to_slide(1001))], vec![hit(5, to_slide(1000))]]);
+    assert_eq!(r.click(), Click::Show(ShowAction::Slide(1)));
+    r.wait(30.0);
+    assert_eq!(r.click(), Click::Show(ShowAction::Slide(0)));
+    // The whole animation is still ahead.
+    assert!(r.visible(ShapeId(2)) && r.opacity(2) > 0.95);
+    assert!(r.show.trigger_playing());
+    r.wait(5.5);
+    assert!(!r.visible(ShapeId(2)));
+}
+
+#[test]
+fn a_slide_comes_back_the_way_it_was_left() {
+    let steps: Vec<Animation> = (1..=3)
+        .map(|i| Animation { shape: ShapeId(i), class: AnimClass::Entrance, effect: "appear".into(), duration_ms: 0, ..Default::default() })
+        .collect();
+    let s1 = slide(1000, vec![shape(1), shape(2), shape(3)], steps, true);
+    let s2 = slide(1001, vec![], vec![], true);
+    let s3 = slide(1002, vec![], vec![], true);
+    let pres = Presentation { slides: vec![s1, s2, s3], ..Default::default() };
+    let mut s = ShowState::new(&pres);
+    s.next(&pres);
+    s.step_done(&pres);
+    assert_eq!(s.step, 1);
+    // A link away and back: still after step 1.
+    assert_eq!(s.follow(&pres, &Action::Slide { slide: SlideId(1002) }, None), LinkJump::Show(ShowAction::Slide(2)));
+    assert_eq!(s.follow(&pres, &Action::Slide { slide: SlideId(1000) }, None), LinkJump::Show(ShowAction::Slide(0)));
+    assert_eq!((s.step, s.playing), (1, false));
+    // So does the back arrow.
+    s.goto(&pres, 1);
+    assert_eq!(s.prev(&pres), ShowAction::Slide(0));
+    assert_eq!(s.step, 1);
+    // A slide the show has not been to is entered at its start; going back to one shows it fully
+    // built.
+    let mut s = ShowState::new(&pres);
+    s.goto(&pres, 2);
+    assert_eq!(s.prev(&pres), ShowAction::Slide(1));
+    assert_eq!(s.step, ShowState::steps(&pres, 1));
+}
+
+#[test]
+fn a_playing_main_step_is_finished_when_the_show_leaves() {
+    let a = Animation { shape: ShapeId(1), class: AnimClass::Entrance, effect: "fade".into(), duration_ms: 500, ..Default::default() };
+    let s1 = slide(1000, vec![shape(1)], vec![a], true);
+    let s2 = slide(1001, vec![], vec![], true);
+    let pres = Presentation { slides: vec![s1, s2], ..Default::default() };
+    let mut s = ShowState::new(&pres);
+    assert_eq!(s.next(&pres), ShowAction::PlayStep(0));
+    s.goto(&pres, 1);
+    s.goto(&pres, 0);
+    assert_eq!((s.step, s.playing), (1, false));
+}
+
+#[test]
+fn show_without_animation_ignores_triggers() {
+    let s = slide(1000, vec![shape(1), shape(2)], vec![exit_on_click(1, 2, 0)], true);
+    let mut pres = Presentation { slides: vec![s], ..Default::default() };
+    pres.show.without_animation = true;
+    let r = Run::new(pres, vec![vec![hit(2, None), hit(1, None)]]);
+    assert_eq!(r.target(), None);
+}
+
+#[test]
+fn clocks_and_pointers_with_hostile_numbers_are_harmless() {
+    let mut r = two_slides(true);
+    let tl = r.tl();
+    for now in [f64::NAN, f64::INFINITY, -1.0e300, 1.0e300, 0.0] {
+        r.show.tick(&tl, now);
+        let _ = r.show.click(&r.pres, &tl, &[], &|_| true, now, None);
+    }
+    // A parent index that points nowhere, or in a circle, is not followed forever.
+    let bad = vec![
+        HitShape { id: ShapeId(1), parent: Some(7), is_group: true, link: None, under_pointer: true },
+        HitShape { id: ShapeId(2), parent: Some(2), is_group: false, link: None, under_pointer: true },
+    ];
+    assert_eq!(r.show.target(&r.pres, &tl, &bad, &|_| true), None);
+}
diff --git a/crates/anim/src/timeline.rs b/crates/anim/src/timeline.rs
index e73acfd9..dcb55484 100644
--- a/crates/anim/src/timeline.rs
+++ b/crates/anim/src/timeline.rs
@@ -57,6 +57,16 @@ pub struct TriggerPlay {
     pub t: f64,
 }
 
+/// When a step of a triggered sequence was started, counted in started steps on the slide. Effects
+/// of different triggers apply in this order, so that a shape hidden by one trigger and shown again
+/// by another ends up as the later of the two left it.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct StepStamp {
+    pub trigger: ShapeId,
+    pub step: usize,
+    pub at: u64,
+}
+
 #[derive(Clone, Debug, Default)]
 struct StepInfo {
     auto: bool,
@@ -379,6 +389,21 @@ impl Timeline {
 
     /// [`Timeline::state`] with the playheads of triggered sequences.
     pub fn state_with(&self, shape: ShapeId, para: Option<usize>, step: usize, t: f64, triggers: &[TriggerPlay]) -> AnimState {
+        self.state_ordered(shape, para, step, t, triggers, &[])
+    }
+
+    /// [`Timeline::state_with`] applying the effects of triggered sequences in the order their steps
+    /// were started (`stamps`), after those of the main sequence. Without stamps they apply in
+    /// Animation Pane order.
+    pub fn state_ordered(
+        &self,
+        shape: ShapeId,
+        para: Option<usize>,
+        step: usize,
+        t: f64,
+        triggers: &[TriggerPlay],
+        stamps: &[StepStamp],
+    ) -> AnimState {
         let para = para.map(|p| self.groups.iter().find(|g| g.0 == shape && g.1 == p).map(|g| g.2).unwrap_or(p));
         let mine = self.effects.iter().filter(|e| e.timing.shape == shape && e.timing.paragraph == para);
         let base_color = self.colors.iter().find(|(s, _)| *s == shape).map(|(_, c)| *c).unwrap_or(Rgba::rgb(0x15, 0x60, 0x82));
@@ -391,7 +416,16 @@ impl Timeline {
         {
             st.visible = false;
         }
-        // Then play in time order: main sequence first, then triggered sequences.
+        // Then play in time order: main sequence first, then triggered sequences as they were clicked.
+        if !stamps.is_empty() {
+            let when = |e: &Effect| match e.timing.sequence {
+                Sequence::Main => 0,
+                Sequence::Trigger(tr) => {
+                    stamps.iter().find(|s| s.trigger == tr && s.step == e.timing.step).map_or(u64::MAX, |s| s.at.saturating_add(1))
+                }
+            };
+            ordered.sort_by_key(|e| (when(e), e.timing.anim));
+        }
         for e in &ordered {
             let (pstep, pt) = match e.timing.sequence {
                 Sequence::Main => (step, t),
diff --git a/crates/engine/Cargo.toml b/crates/engine/Cargo.toml
index 1f4dbfcd..70479e44 100644
--- a/crates/engine/Cargo.toml
+++ b/crates/engine/Cargo.toml
@@ -25,3 +25,6 @@ i_overlay = { workspace = true }
 thiserror = { workspace = true }
 log = { workspace = true }
 image = { workspace = true }
+
+[dev-dependencies]
+deckcraft-anim = { workspace = true }
diff --git a/crates/engine/tests/show_clicks.rs b/crates/engine/tests/show_clicks.rs
new file mode 100644
index 00000000..6fa7d1a0
--- /dev/null
+++ b/crates/engine/tests/show_clicks.rs
@@ -0,0 +1,236 @@
+//! Slide show clicks on decks that went through a PPTX file: links, click-triggered animations and
+//! what a slide looks like when the show comes back to it.
+
+use std::sync::Arc;
+
+use deckcraft_anim::{Click, HitShape, ShowAction, ShowState};
+use deckcraft_geom::Xfrm;
+use deckcraft_model::anim::{AnimClass, AnimStart, Animation, Transition};
+use deckcraft_model::text::{Action, Hyperlink, TextBody};
+use deckcraft_model::{LayoutType, Presentation, Shape, ShapeId, SlideId, defaults};
+
+fn shape(p: &mut Presentation, name: &str, text: &str, x: f64, y: f64, w: f64, h: f64) -> Shape {
+    Shape {
+        id: ShapeId(p.alloc_id()),
+        name: name.into(),
+        xfrm: Some(Xfrm::new(x, y, w, h)),
+        text: Some(TextBody::from_text(text)),
+        ..Default::default()
+    }
+}
+
+fn link_to(slide: SlideId) -> Option<Hyperlink> {
+    Some(Hyperlink { action: Action::Slide { slide }, tooltip: String::new(), highlight_click: false })
+}
+
+/// Clicking `trigger` makes `target` disappear.
+fn disappear_on_click(trigger: ShapeId, target: ShapeId) -> Animation {
+    Animation {
+        shape: target,
+        class: AnimClass::Exit,
+        effect: "disappear".into(),
+        start: AnimStart::OnClick,
+        duration_ms: 0,
+        trigger: Some(trigger),
+        ..Default::default()
+    }
+}
+
+fn add_slide(p: &mut Presentation, shapes: Vec<Shape>, animations: Vec<Animation>, advance_on_click: bool) -> SlideId {
+    let layout = defaults::layout_of_kind(p, LayoutType::Blank).unwrap_or_default();
+    let mut s = defaults::new_slide(p, layout);
+    s.shapes = shapes;
+    s.animations = animations;
+    s.transition = (!advance_on_click).then(|| Transition { advance_on_click: false, ..Default::default() });
+    let id = s.id;
+    p.slides.push(Arc::new(s));
+    id
+}
+
+/// Drops the slide `new_presentation` starts with.
+fn start(p: &mut Presentation) {
+    p.slides.clear();
+}
+
+/// The slide show window's click handling, on a deck read from a PPTX file.
+struct Show {
+    pres: Presentation,
+    state: ShowState,
+}
+
+impl Show {
+    fn open(p: &Presentation) -> Show {
+        let bytes = deckcraft_pptx::export(p).expect("export");
+        let pres = deckcraft_pptx::import(&bytes).expect("import");
+        let state = ShowState::new(&pres);
+        Show { pres, state }
+    }
+
+    fn hits(&self, x: f64, y: f64) -> (Vec<HitShape>, Vec<bool>) {
+        let placed = deckcraft_render::place_slide(&self.pres, self.state.slide);
+        let tl = ShowState::timeline(&self.pres, self.state.slide);
+        let hits = placed
+            .shapes
+            .iter()
+            .map(|s| HitShape {
+                id: s.id,
+                parent: s.parent,
+                is_group: s.is_group,
+                link: s.link.as_ref().map(|l| l.action.clone()),
+                under_pointer: s.rect.x0 <= x && x <= s.rect.x1 && s.rect.y0 <= y && y <= s.rect.y1,
+            })
+            .collect();
+        let visible = placed
+            .shapes
+            .iter()
+            .map(|s| {
+                let a = self.state.anim_state(&tl, s.id, 0.0);
+                a.visible && a.opacity > 0.0
+            })
+            .collect();
+        (hits, visible)
+    }
+
+    /// Click the middle of the shape called `name` on the current slide.
+    fn click(&mut self, name: &str) -> Click {
+        let (x, y) = self.centre(name);
+        let (hits, vis) = self.hits(x, y);
+        let tl = ShowState::timeline(&self.pres, self.state.slide);
+        let visible = |id: ShapeId| hits.iter().zip(&vis).find(|(h, _)| h.id == id).is_none_or(|(_, v)| *v);
+        self.state.click(&self.pres, &tl, &hits, &visible, 0.0, None)
+    }
+
+    fn centre(&self, name: &str) -> (f64, f64) {
+        let slide = &self.pres.slides[self.state.slide];
+        let s = slide.shapes.iter().find(|s| s.name == name).unwrap_or_else(|| panic!("no shape {name}"));
+        let x = s.xfrm.expect("xfrm");
+        (x.x + x.w / 2.0, x.y + x.h / 2.0)
+    }
+
+    fn shown(&self, name: &str) -> bool {
+        let slide = &self.pres.slides[self.state.slide];
+        let Some(s) = slide.shapes.iter().find(|s| s.name == name) else { return false };
+        let a = self.state.anim_state(&ShowState::timeline(&self.pres, self.state.slide), s.id, 0.0);
+        a.visible && a.opacity > 0.0
+    }
+
+    fn is_target(&self, name: &str) -> bool {
+        let (x, y) = self.centre(name);
+        let (hits, vis) = self.hits(x, y);
+        let tl = ShowState::timeline(&self.pres, self.state.slide);
+        let visible = |id: ShapeId| hits.iter().zip(&vis).find(|(h, _)| h.id == id).is_none_or(|(_, v)| *v);
+        let id = self.pres.slides[self.state.slide].shapes.iter().find(|s| s.name == name).map(|s| s.id);
+        self.state.target(&self.pres, &tl, &hits, &visible).map(|t| t.shape) == id
+    }
+}
+
+/// An image that disappears when clicked, revealing a button that links to slide 2 and disappears
+/// as well; slide 2 links back; the slides do not advance on a click.
+fn hide_and_reveal_deck() -> Presentation {
+    let mut p = defaults::new_presentation(None);
+    start(&mut p);
+    let s2_id = SlideId(p.alloc_id());
+    let _ = s2_id;
+    let message = shape(&mut p, "Message", "Both hidden", 100.0, 100.0, 600.0, 300.0);
+    let mut button = shape(&mut p, "Button", "Image hidden", 100.0, 100.0, 600.0, 300.0);
+    let picture = shape(&mut p, "Picture", "Picture", 100.0, 100.0, 600.0, 300.0);
+    let animations = vec![disappear_on_click(picture.id, picture.id), disappear_on_click(button.id, button.id)];
+    let first = add_slide(&mut p, vec![message, button.clone(), picture], animations, false);
+    let mut back = shape(&mut p, "Back", "Go back", 100.0, 100.0, 600.0, 300.0);
+    back.click = link_to(first);
+    let second = add_slide(&mut p, vec![back], vec![], false);
+    // The button links to slide 2.
+    let s = Arc::make_mut(&mut p.slides[0]);
+    button.click = link_to(second);
+    if let Some(b) = s.shapes.iter_mut().find(|x| x.name == "Button") {
+        b.click = button.click.clone();
+    }
+    p
+}
+
+#[test]
+fn hidden_shapes_stay_hidden_and_dead_when_the_show_comes_back() {
+    let mut show = Show::open(&hide_and_reveal_deck());
+    assert!(show.is_target("Picture") && show.shown("Picture"));
+    assert_eq!(show.click("Picture"), Click::Animated);
+    assert!(!show.shown("Picture"));
+    // The button was under the picture; now it is on top. Its click follows the link.
+    assert!(show.is_target("Button"));
+    assert_eq!(show.click("Button"), Click::Show(ShowAction::Slide(1)));
+    assert_eq!(show.state.slide, 1);
+    assert_eq!(show.click("Back"), Click::Show(ShowAction::Slide(0)));
+    // Back on slide 1: both are gone, only the message is left, and it does nothing.
+    assert!(!show.shown("Picture") && !show.shown("Button") && show.shown("Message"));
+    assert!(!show.is_target("Message"));
+    for _ in 0..3 {
+        assert_eq!(show.click("Message"), Click::None);
+    }
+    assert_eq!(show.state.slide, 0);
+}
+
+/// A board of three tiles, each linking to its question, which links back; the tile hides itself.
+#[test]
+fn a_game_board_hides_the_tiles_already_played() {
+    let mut p = defaults::new_presentation(None);
+    start(&mut p);
+    let mut tiles: Vec<Shape> = (0..3).map(|i| shape(&mut p, &format!("Tile {i}"), "100", 50.0 + 250.0 * i as f64, 100.0, 200.0, 100.0)).collect();
+    let animations: Vec<Animation> = tiles.iter().map(|t| disappear_on_click(t.id, t.id)).collect();
+    let board = add_slide(&mut p, tiles.clone(), animations, true);
+    let questions: Vec<SlideId> = (0..3)
+        .map(|i| {
+            let mut back = shape(&mut p, "Back", &format!("Question {i}"), 100.0, 100.0, 400.0, 200.0);
+            back.click = link_to(board);
+            add_slide(&mut p, vec![back], vec![], true)
+        })
+        .collect();
+    let s = Arc::make_mut(&mut p.slides[0]);
+    for (t, q) in tiles.iter_mut().zip(&questions) {
+        if let Some(x) = s.shapes.iter_mut().find(|x| x.id == t.id) {
+            x.click = link_to(*q);
+        }
+    }
+    let mut show = Show::open(&p);
+    for (i, played) in [1usize, 0, 2].into_iter().enumerate() {
+        assert_eq!(show.click(&format!("Tile {played}")), Click::Show(ShowAction::Slide(1 + played)));
+        assert_eq!(show.click("Back"), Click::Show(ShowAction::Slide(0)));
+        // Exactly the tiles played so far are gone.
+        let gone: Vec<bool> = (0..3).map(|t| !show.shown(&format!("Tile {t}"))).collect();
+        assert_eq!(gone.iter().filter(|g| **g).count(), i + 1, "{gone:?}");
+        assert!(gone[played]);
+        assert!(!show.is_target(&format!("Tile {played}")));
+    }
+}
+
+/// A score that cycles: each digit hides itself when clicked and shows the next; the last shows the
+/// first again. Every digit has its own one-click trigger.
+#[test]
+fn a_score_ring_goes_round() {
+    let mut p = defaults::new_presentation(None);
+    start(&mut p);
+    let n = 4usize;
+    let digits: Vec<Shape> = (0..n).map(|i| shape(&mut p, &format!("Score {i}"), &i.to_string(), 400.0, 100.0, 100.0, 100.0)).collect();
+    let mut anims = vec![];
+    for (i, d) in digits.iter().enumerate() {
+        anims.push(disappear_on_click(d.id, d.id));
+        anims.push(Animation {
+            shape: digits[(i + 1) % n].id,
+            class: AnimClass::Entrance,
+            effect: "appear".into(),
+            start: AnimStart::WithPrevious,
+            duration_ms: 0,
+            trigger: Some(d.id),
+            ..Default::default()
+        });
+    }
+    add_slide(&mut p, digits, anims, true);
+    let mut show = Show::open(&p);
+    let showing = |show: &Show| -> Vec<usize> { (0..n).filter(|i| show.shown(&format!("Score {i}"))).collect() };
+    assert_eq!(showing(&show), vec![0]);
+    for click in 0..2 * n {
+        let now = click % n;
+        assert_eq!(showing(&show), vec![now], "before click {click}");
+        assert!(show.is_target(&format!("Score {now}")));
+        assert_eq!(show.click(&format!("Score {now}")), Click::Animated);
+    }
+    assert_eq!(showing(&show), vec![0]);
+}
diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index eb139555..d35ce74f 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -49,7 +49,7 @@ pub use extent::{Region, TILE, layout_extent, pasteboard_region, slide_extent};
 pub use images::{decode as decode_image, gif_frame};
 pub use morph_path::PathMorph;
 pub use morph_text::TextMorph;
-pub use placed::{Placed, PlacedLink, PlacedText, place_slide};
+pub use placed::{Placed, PlacedLink, PlacedShape, PlacedText, place_slide};
 pub use table::row_heights as table_row_heights;
 pub use transition::{SlideParts, composite_transition, render_transition};
 
diff --git a/crates/render/src/placed.rs b/crates/render/src/placed.rs
index 0a0d4737..258bc592 100644
--- a/crates/render/src/placed.rs
+++ b/crates/render/src/placed.rs
@@ -3,7 +3,7 @@
 
 use deckcraft_model::resolve::{self, Ctx};
 use deckcraft_model::text::{Hyperlink, TextBody};
-use deckcraft_model::{Presentation, Shape, ShapeKind};
+use deckcraft_model::{Presentation, Shape, ShapeId, ShapeKind};
 use deckcraft_text::{Opts, TextLayout};
 use kurbo::{Affine, Rect};
 
@@ -22,12 +22,32 @@ pub struct PlacedLink {
     /// Slide-space bounding box.
     pub rect: Rect,
     pub link: Hyperlink,
+    /// The shape that owns the link (for a text hyperlink, the shape holding the text).
+    pub shape: ShapeId,
+    /// A hyperlink on text, not the shape's own action.
+    pub text: bool,
+}
+
+/// A shape of the slide itself (not of its layout or master) with its slide-space bounding box:
+/// what a click in a slide show lands on.
+pub struct PlacedShape {
+    pub id: ShapeId,
+    /// Index into [`Placed::shapes`] of the group this shape is in.
+    pub parent: Option<usize>,
+    pub is_group: bool,
+    /// Slide-space bounding box.
+    pub rect: Rect,
+    /// The shape's own action (Insert ▸ Action), not its text hyperlinks.
+    pub link: Option<Hyperlink>,
 }
 
 #[derive(Default)]
 pub struct Placed {
     pub texts: Vec<PlacedText>,
     pub links: Vec<PlacedLink>,
+    /// The slide's own shapes in drawing order (back to front; a group before its children). Hidden
+    /// shapes are left out.
+    pub shapes: Vec<PlacedShape>,
 }
 
 /// Text and links of slide `index` (master and layout graphics first, as rendered).
@@ -40,22 +60,25 @@ pub fn place_slide(pres: &Presentation, index: usize) -> Placed {
     if show_master {
         let mctx = Ctx::for_master(pres, rctx.master);
         for s in rctx.master.shapes.iter().filter(|s| s.ph.is_none()) {
-            place(&mut out, &mctx, &fields, s, Affine::IDENTITY, 0);
+            place(&mut out, &mctx, &fields, s, Affine::IDENTITY, 0, None, false);
         }
     }
     if show_layout && let Some(l) = rctx.layout {
         let lctx = Ctx::for_layout(pres, rctx.master, l);
         for s in l.shapes.iter().filter(|s| s.ph.is_none()) {
-            place(&mut out, &lctx, &fields, s, Affine::IDENTITY, 0);
+            place(&mut out, &lctx, &fields, s, Affine::IDENTITY, 0, None, false);
         }
     }
     for s in &slide.shapes {
-        place(&mut out, &rctx, &fields, s, Affine::IDENTITY, 0);
+        place(&mut out, &rctx, &fields, s, Affine::IDENTITY, 0, None, true);
     }
     out
 }
 
-fn place(out: &mut Placed, rctx: &Ctx, fields: &SlideFields, s: &Shape, parent: Affine, depth: usize) {
+/// `group` is the index in `out.shapes` of the enclosing group; `own` is true for the slide's own
+/// shapes (recorded in `out.shapes`), false for the layout's and master's.
+#[allow(clippy::too_many_arguments)]
+fn place(out: &mut Placed, rctx: &Ctx, fields: &SlideFields, s: &Shape, parent: Affine, depth: usize, group: Option<usize>, own: bool) {
     if depth > 32 || s.hidden {
         return;
     }
@@ -64,15 +87,22 @@ fn place(out: &mut Placed, rctx: &Ctx, fields: &SlideFields, s: &Shape, parent:
         return;
     }
     let m = parent * x.affine();
+    let rect = m.transform_rect_bbox(Rect::new(0.0, 0.0, x.w, x.h));
     if let Some(link) = &s.click {
-        out.links.push(PlacedLink { rect: m.transform_rect_bbox(Rect::new(0.0, 0.0, x.w, x.h)), link: link.clone() });
+        out.links.push(PlacedLink { rect, link: link.clone(), shape: s.id, text: false });
     }
+    let me = if own {
+        out.shapes.push(PlacedShape { id: s.id, parent: group, is_group: matches!(s.kind, ShapeKind::Group { .. }), rect, link: s.click.clone() });
+        Some(out.shapes.len() - 1)
+    } else {
+        None
+    };
     match &s.kind {
         ShapeKind::Group { children, child } => {
             let ch = Rect::new(child.x, child.y, child.x + child.w, child.y + child.h);
             let gm = parent * deckcraft_geom::group_child_affine(&x, ch);
             for c in children {
-                place(out, rctx, fields, c, gm, depth + 1);
+                place(out, rctx, fields, c, gm, depth + 1, me, own);
             }
         }
         ShapeKind::Table(t) => {
@@ -81,20 +111,21 @@ fn place(out: &mut Placed, rctx: &Ctx, fields: &SlideFields, s: &Shape, parent:
                 let Some(cell) = t.cell(r, c).filter(|cell| !cell.text.is_empty()) else { continue };
                 let body = table::cell_body(rctx, t, r, c, cell);
                 let tmp = Shape { text: Some(body.clone()), ..Default::default() };
-                place_text(out, rctx, fields, &tmp, &body, rect, m);
+                place_text(out, rctx, fields, s.id, &tmp, &body, rect, m);
             }
         }
         ShapeKind::Chart(_) | ShapeKind::Ink { .. } => {}
         _ => {
             let Some(body) = s.text.as_ref().filter(|b| !b.is_empty()) else { return };
             let tr = shape_geometry(s, x.w, x.h).text_rect;
-            place_text(out, rctx, fields, s, body, tr, m);
+            place_text(out, rctx, fields, s.id, s, body, tr, m);
         }
     }
 }
 
 /// Lay out `body` in text rect `tr` of shape `s` (shape-local → slide `m`) and record it and its hyperlinks.
-fn place_text(out: &mut Placed, rctx: &Ctx, fields: &SlideFields, s: &Shape, body: &TextBody, tr: Rect, m: Affine) {
+#[allow(clippy::too_many_arguments)]
+fn place_text(out: &mut Placed, rctx: &Ctx, fields: &SlideFields, owner: ShapeId, s: &Shape, body: &TextBody, tr: Rect, m: Affine) {
     let layout = deckcraft_text::layout(rctx, s, body, &Opts { rect: tr, fields, prompt_color: None, no_shrink: false });
     let m = crate::text_transform(m, tr, layout.rotation);
     // Text hyperlinks: one box per line segment of a linked run.
@@ -105,7 +136,7 @@ fn place_text(out: &mut Placed, rctx: &Ctx, fields: &SlideFields, s: &Shape, bod
         let first = run.glyphs.first().map(|g| g.1).unwrap_or(0.0);
         let (x0, x1) = line.span(run.chars.0, run.chars.1).unwrap_or((first, first));
         let r = Rect::new(x0, line.top, x1, line.bottom);
-        out.links.push(PlacedLink { rect: m.transform_rect_bbox(r), link });
+        out.links.push(PlacedLink { rect: m.transform_rect_bbox(r), link, shape: owner, text: true });
     }
     out.texts.push(PlacedText { layout, transform: m, body: body.clone() });
 }
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 0de3d695..c3cfbb96 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1711,3 +1711,54 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
     let (w, h) = ink(deckcraft_model::text::TextDir::Vertical);
     assert!(h > w * 3, "vert: stroke on its side {w}x{h}");
 }
+
+#[test]
+fn placed_shapes_give_the_click_boxes_of_a_slide_in_drawing_order() {
+    use deckcraft_model::text::{Action, Hyperlink};
+    let link = Hyperlink { action: Action::NextSlide, tooltip: String::new(), highlight_click: false };
+    let rect = |id: u32, x: f64, click: Option<Hyperlink>| Shape {
+        id: ShapeId(id),
+        xfrm: Some(Xfrm::new(x, 50.0, 100.0, 40.0)),
+        click,
+        ..Default::default()
+    };
+    let group = Shape {
+        id: ShapeId(10),
+        xfrm: Some(Xfrm::new(300.0, 50.0, 200.0, 40.0)),
+        click: Some(link.clone()),
+        kind: ShapeKind::Group { children: vec![rect(11, 0.0, None), rect(12, 100.0, None)], child: Xfrm::new(0.0, 0.0, 200.0, 40.0) },
+        ..Default::default()
+    };
+    let hidden = Shape { hidden: true, ..rect(13, 0.0, Some(link.clone())) };
+    let p = deck_with(vec![rect(1, 0.0, None), rect(2, 150.0, Some(link.clone())), hidden, group]);
+    let placed = place_slide(&p, 0);
+    // Back to front, a group before its children; the hidden shape is not there.
+    let ids: Vec<u32> = placed.shapes.iter().map(|s| s.id.0).collect();
+    assert_eq!(ids, vec![1, 2, 10, 11, 12]);
+    // Only the shapes with an action carry a link.
+    let linked: Vec<u32> = placed.shapes.iter().filter(|s| s.link.is_some()).map(|s| s.id.0).collect();
+    assert_eq!(linked, vec![2, 10]);
+    // The children know their group, whose box covers them.
+    let group = &placed.shapes[2];
+    assert!(group.is_group && group.parent.is_none());
+    for child in &placed.shapes[3..] {
+        assert_eq!(child.parent, Some(2));
+        assert!(child.rect.x0 >= group.rect.x0 - 0.01 && child.rect.x1 <= group.rect.x1 + 0.01);
+    }
+    // Shape actions come out as links owned by their shape, not as text links.
+    assert!(placed.links.iter().all(|l| !l.text));
+    assert_eq!(placed.links.iter().map(|l| l.shape.0).collect::<Vec<_>>(), vec![2, 10]);
+}
+
+#[test]
+fn a_text_hyperlink_belongs_to_the_shape_that_holds_the_text() {
+    use deckcraft_model::text::{Action, Hyperlink};
+    let mut body = TextBody::from_text("click here");
+    for r in &mut body.paragraphs[0].runs {
+        r.props.link = Some(Hyperlink { action: Action::FirstSlide, tooltip: String::new(), highlight_click: false });
+    }
+    let sh = Shape { id: ShapeId(7), xfrm: Some(Xfrm::new(100.0, 100.0, 300.0, 60.0)), text: Some(body), ..Default::default() };
+    let placed = place_slide(&deck_with(vec![sh]), 0);
+    assert!(placed.links.iter().any(|l| l.text && l.shape == ShapeId(7)));
+    assert!(placed.shapes.iter().all(|s| s.link.is_none()), "a text link is not the shape's own action");
+}
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 17ec527e..51fe5b70 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -1,10 +1,10 @@
 //! Slide Show: full-screen playback with transitions and animations (`deckcraft-anim`),
 //! keyboard/mouse navigation, pen, black/white screens, presenter view and rehearsed timings.
 
-use deckcraft_anim::{Layer, LinkJump, ShowAction, ShowState, Source, Timeline};
+use deckcraft_anim::{Click, HitShape, Layer, LinkJump, ShowAction, ShowState, Source, StepStamp, Timeline, TriggerPlay};
 use deckcraft_model::text::Hyperlink;
 use deckcraft_model::{Presentation, ShapeId};
-use deckcraft_render::{ParaState, RenderOpts, ShapeState};
+use deckcraft_render::{ParaState, PlacedLink, PlacedShape, RenderOpts, ShapeState};
 use egui::{Align2, Color32, CornerRadius, Mesh, Pos2, Rect, Sense, Stroke, TextureHandle, Ui, pos2, vec2};
 use serde_json::json;
 
@@ -40,8 +40,9 @@ pub struct Show {
     media_slide: Option<usize>,
     /// The slide shown before the current one (the Last Slide Viewed action).
     last_viewed: Option<usize>,
-    /// Click areas of hyperlinks and shape actions on slide `.0`, in slide points.
-    links: Option<(usize, Vec<deckcraft_render::PlacedLink>)>,
+    /// Click areas on slide `.0`, in slide points: hyperlinks and shape actions, and the slide's
+    /// shapes in drawing order.
+    links: Option<(usize, Vec<PlacedLink>, Vec<PlacedShape>)>,
 }
 
 #[derive(Clone, PartialEq)]
@@ -52,6 +53,8 @@ struct Key {
     doc: usize,
     /// Media hidden while not playing.
     hidden: Vec<ShapeId>,
+    /// Clicks played of each triggered animation (what the shapes look like when none is running).
+    plays: Vec<(ShapeId, usize)>,
     /// The frames animated GIFs show.
     gif: u64,
 }
@@ -169,7 +172,9 @@ impl Show {
 
     /// On entering a slide: auto-play its first step when it begins With/After Previous.
     fn after_enter(&mut self, doc: &Presentation, now: f64) {
-        let auto = self.timeline(doc).step_is_auto(0);
+        // A slide the show comes back to is not started again: only a first visit has an automatic
+        // first step.
+        let auto = self.timeline(doc).step_is_auto(0) && self.state.step == 0;
         if auto || self.autoplay {
             let a = self.state.next(doc);
             if matches!(a, ShowAction::PlayStep(_)) {
@@ -179,8 +184,8 @@ impl Show {
     }
 }
 
-fn state_for(tl: &Timeline, id: ShapeId, step: usize, t: f64) -> ShapeState {
-    let a = tl.state(id, None, step, t);
+fn state_for(tl: &Timeline, id: ShapeId, step: usize, t: f64, plays: &[TriggerPlay], stamps: &[StepStamp]) -> ShapeState {
+    let a = tl.state_ordered(id, None, step, t, plays, stamps);
     ShapeState {
         visible: a.visible,
         opacity: a.opacity,
@@ -314,15 +319,18 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             _ => {}
         }
     }
+    // The clock of the triggered animations runs before anything reacts to the pointer.
+    show.tick_triggers(&doc, now);
     let on_slide = !show.pen && !show.ended && show.blank.is_none() && !show.reading_bar_hit(&ctx);
     let gif_click = if clicked && on_slide { gif_hit(&ctx, ui, &show, &doc, app) } else { None };
     let media_click = if clicked && on_slide && gif_click.is_none() { media_hit(&ctx, ui, &show, &doc) } else { None };
-    let link = if on_slide && gif_click.is_none() && media_click.is_none() { link_hit(&ctx, ui, &mut show, &doc) } else { None };
+    let under = if on_slide && gif_click.is_none() && media_click.is_none() { shapes_under_pointer(&ctx, ui, &mut show, &doc, now) } else { None };
+    let pointing = under.as_ref().is_some_and(|u| u.pick.is_some());
     if let Some(id) = gif_click {
         let _ = app.run("media.gifPlay", json!({"id": id}));
     } else if let Some((id, clip)) = media_click {
         app.media.toggle(&doc, id, &clip, crate::media::Owner::Show);
-    } else if clicked && let Some(l) = &link {
+    } else if clicked && let Some(Pick::Text(l)) = under.as_ref().and_then(|u| u.pick.clone()) {
         let last = show.last_viewed;
         match show.state.follow(&doc, &l.action, last) {
             LinkJump::Show(a) => actions.push(a),
@@ -336,7 +344,14 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         } else if show.blank.is_some() {
             show.blank = None;
         } else {
-            actions.push(show.state.next(&doc));
+            // A shape with an action or a triggered animation, or the background.
+            let none = Under::default();
+            match show.click_slide(&doc, under.as_ref().unwrap_or(&none), now) {
+                Click::Show(a) => actions.push(a),
+                Click::Open(url) => ctx.open_url(egui::OpenUrl::new_tab(url)),
+                Click::Exit => keep = false,
+                Click::Animated | Click::None => {}
+            }
         }
     }
     if secondary && !show.ended {
@@ -395,8 +410,11 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
     } else {
         let idx = show.state.slide;
         let step = show.state.step;
-        let animating = show.state.playing;
-        let t = if animating { now - show.step_start } else { 0.0 };
+        // A main step or a triggered animation is running: the picture changes every frame.
+        let animating = show.state.playing || show.state.trigger_playing();
+        let t = if show.state.playing { now - show.step_start } else { 0.0 };
+        let plays = show.state.trigger_plays();
+        let stamps = show.state.trigger_stamps();
         let media = crate::media::slide_media(&doc, idx);
         let hidden: Vec<ShapeId> = media
             .iter()
@@ -409,14 +427,15 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         let times: Vec<_> = gifs.iter().map(|g| (g.id, g.t)).collect();
         crate::media::gif_repaint(&ctx, &gifs);
         let gif = crate::media::gif_key(&gifs);
-        let key = Key { slide: idx, step, size, doc: std::sync::Arc::as_ptr(&doc) as usize, hidden: hidden.clone(), gif };
+        let done: Vec<(ShapeId, usize)> = plays.iter().map(|p| (p.trigger, p.step)).collect();
+        let key = Key { slide: idx, step, size, doc: std::sync::Arc::as_ptr(&doc) as usize, hidden: hidden.clone(), plays: done, gif };
         let tex = if !animating && show.tex.as_ref().is_some_and(|(k, _)| *k == key) {
             show.tex.as_ref().map(|(_, t)| t.clone())
         } else {
             let tl = show.timeline(&doc).clone();
             let hide = hidden.clone();
             let f = move |id: ShapeId| {
-                let mut st = state_for(&tl, id, step, t);
+                let mut st = state_for(&tl, id, step, t, &plays, &stamps);
                 if hide.contains(&id) {
                     st.visible = false;
                 }
@@ -454,7 +473,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             (Some(tr), Some(tl)) => {
                 let p = ((now - tr.start) / tr.dur.max(0.01)).clamp(0.0, 1.0);
                 let hidden_b = |id: ShapeId| {
-                    let st = state_for(&tl, id, 0, 0.0);
+                    let st = state_for(&tl, id, 0, 0.0, &[], &[]);
                     !st.visible || st.opacity <= 0.0 || hidden.contains(&id)
                 };
                 tr.from
@@ -579,7 +598,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
             s.push(pos2((p.x - srect.min.x) / srect.width(), (p.y - srect.min.y) / srect.height()));
         }
         ctx.set_cursor_icon(egui::CursorIcon::Crosshair);
-    } else if link.is_some() {
+    } else if pointing {
         ctx.set_cursor_icon(egui::CursorIcon::PointingHand);
     } else if now - show.last_move > 2.5 && !show.reading {
         ctx.set_cursor_icon(egui::CursorIcon::None);
@@ -725,9 +744,34 @@ fn media_hit(ctx: &egui::Context, ui: &Ui, show: &Show, doc: &Presentation) -> O
     })
 }
 
-/// The link under the pointer: the topmost shape action or text hyperlink on the current slide
-/// (a text link wins over its shape's action).
-fn link_hit(ctx: &egui::Context, ui: &Ui, show: &mut Show, doc: &Presentation) -> Option<Hyperlink> {
+/// What a click on the pointer's spot acts on.
+#[derive(Clone)]
+enum Pick {
+    /// A hyperlink in text.
+    Text(Hyperlink),
+    /// A shape with an action or a triggered animation.
+    Shape,
+}
+
+/// The slide's shapes at the pointer, for [`ShowState::click`].
+#[derive(Default)]
+struct Under {
+    shapes: Vec<HitShape>,
+    /// Whether each of `shapes` is currently shown (an animation may have hidden it).
+    visible: Vec<bool>,
+    pick: Option<Pick>,
+}
+
+impl Under {
+    fn visible(&self, id: ShapeId) -> bool {
+        self.shapes.iter().zip(&self.visible).find(|(h, _)| h.id == id).is_none_or(|(_, v)| *v)
+    }
+}
+
+/// What is under the pointer on the shown slide: the slide's shapes with their animation state, the
+/// topmost of them that does something when clicked, and a text hyperlink on it. Only shapes that
+/// are shown can be clicked, and a shape without an action hides the ones beneath it.
+fn shapes_under_pointer(ctx: &egui::Context, ui: &Ui, show: &mut Show, doc: &Presentation, now: f64) -> Option<Under> {
     let p = ctx.input(|i| i.pointer.hover_pos())?;
     let full = ui.max_rect();
     let avail = if show.reading { Rect::from_min_max(full.min, pos2(full.max.x, full.max.y - 34.0)) } else { full };
@@ -735,11 +779,72 @@ fn link_hit(ctx: &egui::Context, ui: &Ui, show: &mut Show, doc: &Presentation) -
     let k = (srect.width() / doc.slide_size.width.max(1.0) as f32) as f64;
     let (x, y) = ((p.x - srect.min.x) as f64 / k, (p.y - srect.min.y) as f64 / k);
     let i = show.state.slide;
-    if show.links.as_ref().is_none_or(|(s, _)| *s != i) {
-        show.links = Some((i, deckcraft_render::place_slide(doc, i).links));
+    if show.links.as_ref().is_none_or(|(s, ..)| *s != i) {
+        let placed = deckcraft_render::place_slide(doc, i);
+        show.links = Some((i, placed.links, placed.shapes));
+    }
+    show.timeline(doc);
+    let (Some((_, tl)), Some((_, links, shapes))) = (&show.timeline, &show.links) else { return None };
+    let inside = |x0: f64, y0: f64, x1: f64, y1: f64| x0 <= x && x <= x1 && y0 <= y && y <= y1;
+    let hits: Vec<HitShape> = shapes
+        .iter()
+        .map(|s| HitShape {
+            id: s.id,
+            parent: s.parent,
+            is_group: s.is_group,
+            link: s.link.as_ref().map(|l| l.action.clone()),
+            under_pointer: inside(s.rect.x0, s.rect.y0, s.rect.x1, s.rect.y1),
+        })
+        .collect();
+    let (step, plays, stamps) = (show.state.step, show.state.trigger_plays(), show.state.trigger_stamps());
+    let t = if show.state.playing { now - show.step_start } else { 0.0 };
+    let visible: Vec<bool> = shapes
+        .iter()
+        .map(|s| {
+            let a = tl.state_ordered(s.id, None, step, t, &plays, &stamps);
+            a.visible && a.opacity > 0.0
+        })
+        .collect();
+    let mut under = Under { shapes: hits, visible, pick: None };
+    let shown = |id: ShapeId| under.visible(id);
+    // A hyperlink in text applies when its shape is the one on top.
+    let top = show.state.top(doc, tl, &under.shapes, &shown);
+    let text = links.iter().rev().filter(|l| l.text && inside(l.rect.x0, l.rect.y0, l.rect.x1, l.rect.y1)).find(|l| {
+        let mut at = top;
+        (0..=under.shapes.len()).any(|_| match at.and_then(|k| under.shapes.get(k)) {
+            Some(h) if h.id == l.shape => true,
+            Some(h) => {
+                at = h.parent;
+                false
+            }
+            None => false,
+        })
+    });
+    under.pick = match text {
+        Some(l) => Some(Pick::Text(l.link.clone())),
+        None => show.state.target(doc, tl, &under.shapes, &shown).map(|_| Pick::Shape),
+    };
+    Some(under)
+}
+
+impl Show {
+    /// Advance the clock of the running triggered animations.
+    fn tick_triggers(&mut self, doc: &Presentation, now: f64) {
+        self.timeline(doc);
+        if let Some((_, tl)) = &self.timeline {
+            self.state.tick(tl, now);
+        }
+    }
+
+    /// A click on the slide: the shape under the pointer acts, or the background advances.
+    fn click_slide(&mut self, doc: &Presentation, under: &Under, now: f64) -> Click {
+        self.timeline(doc);
+        let last = self.last_viewed;
+        match &self.timeline {
+            Some((_, tl)) => self.state.click(doc, tl, &under.shapes, &|id| under.visible(id), now, last),
+            None => Click::None,
+        }
     }
-    let (_, links) = show.links.as_ref()?;
-    links.iter().rev().find(|l| l.rect.x0 <= x && x <= l.rect.x1 && l.rect.y0 <= y && y <= l.rect.y1).map(|l| l.link.clone())
 }
 
 /// A slide-space box on screen, the slide being drawn in `srect` at `k` pixels per point.
@@ -878,7 +983,7 @@ mod tests {
         let ctx = egui::Context::default();
         let red = ctx.load_texture("show", egui::ColorImage::filled([1, 1], Color32::RED), egui::TextureOptions::LINEAR);
         let mut show = Show::new(&doc, 0, false, false);
-        show.tex = Some((Key { slide: 0, step: 0, size: (1, 1), doc: 0, hidden: vec![], gif: 0 }, red.clone()));
+        show.tex = Some((Key { slide: 0, step: 0, size: (1, 1), doc: 0, hidden: vec![], gif: 0, plays: vec![] }, red.clone()));
         assert!(show.apply(ShowAction::Slide(1), &doc, 0.0));
         let tr = show.trans.as_ref().expect("the fade plays");
         assert_eq!(tr.old.as_ref().map(TextureHandle::id), Some(red.id()));
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index 8ec5d0f4..5f190902 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -1,6 +1,6 @@
 # Transitions and animations: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** major (transitions measured frame by frame against PowerPoint for Windows' video export and retuned; previous: created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (interactive-deck clicks in the slide show; previous: major (transitions measured frame by frame against PowerPoint for Windows' video export and retuned; previous: created)) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Transitions and animations are what make a deck a presentation, and the part of PowerPoint people
 notice first when it's missing. Scores roll up into [target-app-parity.md](target-app-parity.md)
@@ -67,7 +67,7 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 | Effect Options (direction, sequence by paragraph) | yes | yes |
 | Effect dialog: sound, after-animation dim/hide, animate text by word/letter, smooth start/end, bounce end, repeat, rewind | yes | partly; rewind lost on PPTX save (#77) |
 | By-paragraph text builds, sub-bullets follow parents | yes | yes |
-| Triggers (on click of a shape) | yes | yes |
+| Triggers (on click of a shape) | yes | yes; played in the show: a step per click, the sequence starts over after its last step, a click completes a playing step |
 | Triggers on a media bookmark | yes | no |
 | Animation Painter | yes | yes (#54) |
 | Animation Pane: list, reorder, remove | yes | yes |
@@ -94,4 +94,5 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 | Date | Change | Summary |
 |---|---|---|
 | 2026-10-13 | major | Transitions measured frame by frame against PowerPoint's video export and retuned (mean diff 35.7 → 15.0); PowerPoint's XML defaults and option meanings; new options |
+| 2026-10-13 | minor | Triggers now play in the slide show (they were read and written but never started), effects of different triggers apply in the order they were clicked |
 | 2026-10-10 | major | Created: 48/48 transitions, 64 of ~190 animation effects, pane and option depth, estimates |
diff --git a/docs/gaps.md b/docs/gaps.md
index a2894b42..dd60c4f8 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,6 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (interactive-deck clicks in the slide show; previous: minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues)) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -159,6 +159,20 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### Animation Pane, effect count and preview
 Detail in [animation-parity.md](animation-parity.md). 10–16 h; the pane is a **beta blocker**.
 
+### Interactive decks: media-action links, audio-triggered effects and click boxes
+- **Evidence:** the slide show plays click-triggered animations, keeps each slide's state across
+  visits and ignores shapes an animation has hidden (`crates/anim/src/interact.rs`). Still open,
+  found by running three classroom game decks (Jeopardy-style boards, hide-and-reveal, score
+  counters): a click on a shape whose action is "play sound" (`ppaction://media`, 126 and 486
+  shapes in two decks) does nothing; triggers that start on `onStopAudio` or `begin` conditions are
+  not read as triggers; click boxes are the shape's bounding box (a hexagon's corners count) and do
+  not follow a shape that a motion path has moved; the PPTX writer turns every "on click" after the
+  first effect of a trigger into "after previous", so a trigger with several click steps saved from
+  DeckCraft plays all of them at once.
+- **Impact:** games built around sound effects on buttons, or around a button that counts up with
+  repeated clicks, lose that part when they are saved from DeckCraft or played in it.
+- **Estimate:** 4–8 h.
+
 ### Notes and Handout masters
 - **Evidence:** checklist row missing; PPTX writes a notes master but there's no view to edit it,
   and no handout master at all.
@@ -257,6 +271,7 @@ Detail in [localization-parity.md](localization-parity.md).
 | Date | Change | Summary |
 |---|---|---|
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
+| 2026-10-13 | minor | Interactive decks: triggers, return-to-slide state and click rules landed in the slide show; the remaining pieces are one new entry under Features |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
 | 2026-10-12 | minor | EMF/WMF text, pattern and hatch brushes drawn; legacy OLE and ActiveX previews shown; the SVG gap keeps only EMF clip regions |
 | 2026-10-12 | minor | Text warps render (all 40 presets, adjusts round-trip); the warp gap is now the gallery, command and handles |
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index fd981595..bc15277d 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,6 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-10 · **Change:** major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (interactive-deck clicks in the slide show; previous: major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu)) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -20,6 +20,9 @@ ready** (estimated), **10–16 h** to parity.
 | Step clock: a click after a long pause plays its step (#11) | yes | yes | |
 | Hidden slides skipped | yes | yes | |
 | Hyperlinks and action settings followed (slides, web, mail, End Show, Last Viewed) | yes | yes | Only `http(s)` and `mailto` open outside the show, by design (`safe_url`) |
+| A shape with a triggered animation plays it when clicked; shapes an animation has hidden cannot be clicked; a shape without an action on top of one with an action blocks it; the pointer is a hand over what can be clicked | yes | yes | Click boxes are bounding boxes; "play sound" actions (`ppaction://media`) do nothing yet |
+| A slide the show returns to (link, arrow keys) looks as it was left; a triggered animation goes on where it stopped | yes | yes | A main-sequence step still playing when the show leaves is finished |
+| "Advance on click" off: a click never leaves the slide (animation steps still play, keys still move on) | yes | yes | |
 | Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable |
 | Animated GIFs play; pause from their corner button | yes | yes (#39) | |
 | See All Slides grid during the show | yes | no | |
@@ -73,4 +76,5 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-13 | minor | Click handling for interactive decks: triggers, per-slide state kept across visits, visible-shape hit testing with hand cursor, advance on click |
 | 2026-10-10 | major | Created: show, presenter view, rehearse and record, compared with PowerPoint 16.113's Slide Show tab and menu |

From cf640c4b08df98a60669141cd97e8e3e4e22598c Mon Sep 17 00:00:00 2001
From: Gert Pellin <gert@pellin.be>
Date: Wed, 14 Oct 2026 13:07:49 +0200
Subject: [PATCH 304/376] CLI: convert and run refuse output formats DeckCraft
 can't write (#715)

convert, run --save and run --export picked the format from the output
extension and fell back to native .deckcraft bytes for any extension
they didn't know, so out.odp, out.gif, out.svg and out.outline were
zips with exit status 0. They now fail before writing anything, with
the extension and the supported ones in the error.
---
 apps/deckcraft-cli/src/main.rs      | 15 +++++++-
 apps/deckcraft-cli/tests/convert.rs | 57 +++++++++++++++++++++++++++++
 crates/engine/src/cmd/file.rs       | 11 ++++++
 crates/engine/src/tests.rs          | 13 +++++++
 4 files changed, 95 insertions(+), 1 deletion(-)
 create mode 100644 apps/deckcraft-cli/tests/convert.rs

diff --git a/apps/deckcraft-cli/src/main.rs b/apps/deckcraft-cli/src/main.rs
index fd1d96ea..3c4d618b 100644
--- a/apps/deckcraft-cli/src/main.rs
+++ b/apps/deckcraft-cli/src/main.rs
@@ -240,9 +240,9 @@ fn render_transition(args: &[String]) -> Result<(), String> {
 
 fn convert(args: &[String]) -> Result<(), String> {
     let (Some(input), Some(out)) = (args.first(), args.get(1)) else { return Err("convert needs IN and OUT".into()) };
+    let fmt = output_format(out)?;
     let mut s = Session::new();
     open(&mut s, Some(input), false)?;
-    let fmt = deckcraft_engine::cmd::file::format_for_path(out);
     let r = if matches!(fmt, "png" | "jpeg") {
         s.execute("file.export", &json!({"path": out, "slide": 0}))
     } else {
@@ -253,6 +253,16 @@ fn convert(args: &[String]) -> Result<(), String> {
     Ok(())
 }
 
+/// The format `convert`, `run --save` and `run --export` write to `path`, or an error naming the
+/// supported extensions when `path`'s extension isn't one (rather than native bytes under that name).
+fn output_format(path: &str) -> Result<&'static str, String> {
+    use deckcraft_engine::cmd::file::{WRITABLE_EXTENSIONS, writable_format_for_path};
+    writable_format_for_path(path).ok_or_else(|| {
+        let ext = std::path::Path::new(path).extension().map(|e| format!(".{}", e.to_string_lossy())).unwrap_or_else(|| "(none)".into());
+        format!("{path}: unsupported output format {ext} (supported: .{})", WRITABLE_EXTENSIONS.join(", ."))
+    })
+}
+
 fn run(args: &[String]) -> Result<(), String> {
     let mut input = None;
     let mut sample = false;
@@ -272,6 +282,9 @@ fn run(args: &[String]) -> Result<(), String> {
             other => return Err(format!("unknown option `{other}`")),
         }
     }
+    for p in save.iter().chain(&export) {
+        output_format(p)?;
+    }
     let mut s = Session::new();
     open(&mut s, input.as_deref(), sample)?;
     for c in cmds {
diff --git a/apps/deckcraft-cli/tests/convert.rs b/apps/deckcraft-cli/tests/convert.rs
new file mode 100644
index 00000000..5de25e51
--- /dev/null
+++ b/apps/deckcraft-cli/tests/convert.rs
@@ -0,0 +1,57 @@
+//! `deckcraft-cli convert` writes the format OUT's extension names, or fails without writing.
+
+use std::path::{Path, PathBuf};
+use std::process::{Command, Output};
+
+fn cli(args: &[&Path]) -> Output {
+    Command::new(env!("CARGO_BIN_EXE_deckcraft-cli")).args(args).output().unwrap()
+}
+
+fn temp_dir(name: &str) -> PathBuf {
+    let dir = std::env::temp_dir().join(format!("deckcraft-cli-{name}-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    std::fs::create_dir_all(&dir).unwrap();
+    dir
+}
+
+#[test]
+fn convert_rejects_output_formats_it_cannot_write() {
+    let dir = temp_dir("convert-unsupported");
+    let input = dir.join("in.pptx");
+    let out = Command::new(env!("CARGO_BIN_EXE_deckcraft-cli")).args(["run", "--sample", "--export"]).arg(&input).output().unwrap();
+    assert!(out.status.success(), "{}", String::from_utf8_lossy(&out.stderr));
+
+    for name in ["out.odp", "out.gif", "out.svg", "out.outline", "out"] {
+        let target = dir.join(name);
+        let out = cli(&[Path::new("convert"), &input, &target]);
+        assert!(!out.status.success(), "{name}: convert should fail");
+        let err = String::from_utf8_lossy(&out.stderr);
+        assert!(err.contains("unsupported output format") && err.contains(".pptx"), "{name}: {err}");
+        assert!(!target.exists(), "{name}: nothing is written");
+    }
+
+    let target = dir.join("out.deckcraft");
+    let out = cli(&[Path::new("convert"), &input, &target]);
+    assert!(out.status.success(), "{}", String::from_utf8_lossy(&out.stderr));
+    assert!(std::fs::read(&target).unwrap().starts_with(b"PK\x03\x04"));
+
+    let target = dir.join("out.txt");
+    let out = cli(&[Path::new("convert"), &input, &target]);
+    assert!(out.status.success(), "{}", String::from_utf8_lossy(&out.stderr));
+    assert!(!std::fs::read(&target).unwrap().starts_with(b"PK"), "an outline is text, not a zip");
+
+    let _ = std::fs::remove_dir_all(&dir);
+}
+
+#[test]
+fn run_rejects_unsupported_save_and_export_paths_before_running() {
+    let dir = temp_dir("run-unsupported");
+    for flag in ["--save", "--export"] {
+        let target = dir.join("deck.odp");
+        let out = Command::new(env!("CARGO_BIN_EXE_deckcraft-cli")).args(["run", "--sample", flag]).arg(&target).output().unwrap();
+        assert!(!out.status.success(), "{flag}: run should fail");
+        assert!(String::from_utf8_lossy(&out.stderr).contains("unsupported output format .odp"), "{flag}");
+        assert!(!target.exists(), "{flag}: nothing is written");
+    }
+    let _ = std::fs::remove_dir_all(&dir);
+}
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index f6424f7c..89dea68f 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -182,6 +182,17 @@ pub fn pdf_bytes(doc: &Presentation, p: &Value) -> Result<Vec<u8>> {
     deckcraft_pdf::export(doc, &pdf_options(p, doc.slides.len())?).map_err(|e| EngineError::Other(e.to_string()))
 }
 
+/// The output extensions [`format_for_path`] maps to a writer of that format.
+pub const WRITABLE_EXTENSIONS: &[&str] = &["deckcraft", "pptx", "potx", "ppsx", "pdf", "png", "jpg", "jpeg", "txt", "md"];
+
+/// The format a file named `path` is written in, or `None` when its extension names no format
+/// DeckCraft writes (`.odp`, `.gif`, `.svg`, no extension …): [`format_for_path`] would save
+/// those as native `.deckcraft` bytes under the wrong name.
+pub fn writable_format_for_path(path: &str) -> Option<&'static str> {
+    let ext = std::path::Path::new(path).extension()?.to_str()?.to_ascii_lowercase();
+    WRITABLE_EXTENSIONS.contains(&ext.as_str()).then(|| format_for_path(path))
+}
+
 pub fn format_for_path(path: &str) -> &'static str {
     let l = path.to_ascii_lowercase();
     if l.ends_with(".pptx") || l.ends_with(".potx") || l.ends_with(".ppsx") {
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e83f72ef..2727a717 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -181,6 +181,19 @@ fn sample_deck_builds_and_renders() {
     assert!(v["slides"].as_array().unwrap().len() >= 8);
 }
 
+#[test]
+fn writable_format_for_path_rejects_formats_deckcraft_does_not_write() {
+    use crate::cmd::file::writable_format_for_path as f;
+    assert_eq!(f("a.deckcraft"), Some("deckcraft"));
+    assert_eq!(f("dir/A.PPTX"), Some("pptx"));
+    assert_eq!(f("a.pdf"), Some("pdf"));
+    assert_eq!(f("a.jpg"), Some("jpeg"));
+    assert_eq!(f("a.txt"), Some("outline"));
+    for path in ["a.odp", "a.gif", "a.svg", "a.outline", "a", "dir.v2/a"] {
+        assert_eq!(f(path), None, "{path}");
+    }
+}
+
 #[test]
 fn save_and_reopen_native() {
     let mut s = Session::new();

From d78e657e4cb1e490ceb5445785c052d9cf5ad963 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <brandon@storyteller.ai>
Date: Wed, 14 Oct 2026 09:33:03 -0400
Subject: [PATCH 305/376] Release 0.7.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 Cargo.lock | 56 +++++++++++++++++++++++++++---------------------------
 Cargo.toml |  2 +-
 2 files changed, 29 insertions(+), 29 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 4044fce6..4cf2cd89 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -877,7 +877,7 @@ checksum = "0c87e182de0887fd5361989c677c4e8f5000cd9491d6d563161a8f3a5519fc7f"
 
 [[package]]
 name = "deckcraft"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "arboard",
  "cpal",
@@ -896,7 +896,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-anim"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-geom",
  "deckcraft-model",
@@ -905,7 +905,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-av1"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-bitstream",
  "rayon",
@@ -914,14 +914,14 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-bitstream"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "proptest",
 ]
 
 [[package]]
 name = "deckcraft-cli"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-engine",
  "deckcraft-mcp",
@@ -930,14 +930,14 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-color"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "deckcraft-engine"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-color",
  "deckcraft-fonts",
@@ -959,7 +959,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-fonts"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "epaint_default_fonts",
  "harfrust 0.13.3",
@@ -971,7 +971,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-format"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-model",
  "serde",
@@ -982,7 +982,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-geom"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "kurbo",
  "serde",
@@ -990,7 +990,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-h264"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-bitstream",
  "rayon",
@@ -999,7 +999,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-hevc"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-bitstream",
  "rayon",
@@ -1008,7 +1008,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-isobmff"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-bitstream",
  "thiserror 2.0.21",
@@ -1016,11 +1016,11 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-matroska"
-version = "0.6.1"
+version = "0.7.0"
 
 [[package]]
 name = "deckcraft-mcp"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-engine",
  "deckcraft-render",
@@ -1030,7 +1030,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-media"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-av1",
  "deckcraft-h264",
@@ -1048,7 +1048,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-metafile"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "kurbo",
  "thiserror 2.0.21",
@@ -1056,7 +1056,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-model"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-color",
  "deckcraft-geom",
@@ -1068,15 +1068,15 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-ogg"
-version = "0.6.1"
+version = "0.7.0"
 
 [[package]]
 name = "deckcraft-opus"
-version = "0.6.1"
+version = "0.7.0"
 
 [[package]]
 name = "deckcraft-pdf"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-fonts",
  "deckcraft-model",
@@ -1091,7 +1091,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-pptx"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-color",
  "deckcraft-engine",
@@ -1107,7 +1107,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-render"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-anim",
  "deckcraft-color",
@@ -1126,7 +1126,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-text"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "chrono",
  "deckcraft-color",
@@ -1140,7 +1140,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-ui-egui"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-anim",
  "deckcraft-color",
@@ -1162,7 +1162,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-vp9"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-bitstream",
  "rayon",
@@ -1171,7 +1171,7 @@ dependencies = [
 
 [[package]]
 name = "deckcraft-web"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "deckcraft-engine",
  "deckcraft-ui-egui",
@@ -5667,7 +5667,7 @@ checksum = "9440ea3e5aeabb0ac63af70daf835274065238cdd0cec83418f417eae38bacee"
 
 [[package]]
 name = "xtask"
-version = "0.6.1"
+version = "0.7.0"
 dependencies = [
  "serde_json",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index b8596156..5bb1f9af 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,7 +4,7 @@ members = ["crates/*", "apps/*", "xtask"]
 default-members = ["crates/*", "apps/deckcraft", "apps/deckcraft-cli"]
 
 [workspace.package]
-version = "0.6.1"
+version = "0.7.0"
 edition = "2024"
 license = "MIT OR Apache-2.0"
 rust-version = "1.90"

From 5d31b787368199104016d37ccb29be05b60c7581 Mon Sep 17 00:00:00 2001
From: midasmatterhorn <248507632+midasmatterhorn@users.noreply.github.com>
Date: Wed, 14 Oct 2026 18:01:42 +0300
Subject: [PATCH 306/376] pptx: write linked pictures with r:link so PowerPoint
 resolves external images

---
 crates/pptx/src/write/dml.rs   | 12 ++++++++++--
 crates/pptx/tests/roundtrip.rs | 28 ++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/crates/pptx/src/write/dml.rs b/crates/pptx/src/write/dml.rs
index 16a069fe..a960df46 100644
--- a/crates/pptx/src/write/dml.rs
+++ b/crates/pptx/src/write/dml.rs
@@ -95,6 +95,9 @@ pub fn fill(w: &mut W, x: &mut Exp, o: &mut Out, f: &Fill) {
 
 /// `a:blipFill` / `p:blipFill`.
 pub fn blip_fill(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, pf: &PictureFill) {
+    // An image that lives outside the package is a linked picture: `a:blip` names it through
+    // `r:link`; `r:embed` may only reference a part inside the package.
+    let linked = x.p.media(pf.media).is_some_and(|m| m.data.is_empty() && m.link.is_some());
     let rid = x.media_rel(o, pf.media, "image").unwrap_or_else(|| x.placeholder_rel(o));
     w.open(tag, A::new().a("rotWithShape", if pf.upright { "0" } else { "1" }));
     let adj = &pf.adjust;
@@ -106,7 +109,7 @@ pub fn blip_fill(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, pf: &PictureFil
         || adj.clear_color.is_some()
         || adj.bilevel.is_some()
         || adj.alpha_inv;
-    let a = A::new().a("r:embed", &rid);
+    let a = if linked { A::new().a("r:link", &rid) } else { A::new().a("r:embed", &rid) };
     if has_kids {
         w.open("a:blip", a);
         if let Some(c) = adj.clear_color {
@@ -521,7 +524,12 @@ pub fn ppr(w: &mut W, x: &mut Exp, o: &mut Out, tag: &str, level: Option<u8>, p:
         Some(Bullet::Picture { media }) => match x.media_rel(o, *media, "image") {
             Some(rid) => {
                 w.open0("a:buBlip");
-                w.empty("a:blip", A::new().a("r:embed", rid));
+                let a = if x.p.media(*media).is_some_and(|m| m.data.is_empty() && m.link.is_some()) {
+                    A::new().a("r:link", &rid)
+                } else {
+                    A::new().a("r:embed", &rid)
+                };
+                w.empty("a:blip", a);
                 w.close("a:buBlip");
             }
             None => w.empty("a:buChar", A::new().a("char", "•")),
diff --git a/crates/pptx/tests/roundtrip.rs b/crates/pptx/tests/roundtrip.rs
index db6d0beb..dafa6c03 100644
--- a/crates/pptx/tests/roundtrip.rs
+++ b/crates/pptx/tests/roundtrip.rs
@@ -991,3 +991,31 @@ fn transition_defaults_read_like_powerpoint() {
         assert_eq!((t.kind.as_str(), t.option.as_str(), t.duration_ms), (*kind, *option, 2000), "{el}");
     }
 }
+
+#[test]
+fn linked_pictures_are_written_with_r_link() {
+    // A picture whose bytes live outside the package must be referenced with `r:link`; `r:embed`
+    // may only name a part inside the package (PowerPoint won't load the linked image otherwise).
+    let mut p = defaults::new_presentation(None);
+    let media = deckcraft_model::MediaId(5000);
+    p.media.push(deckcraft_model::MediaItem {
+        id: media,
+        name: "linked.png".into(),
+        content_type: "image/png".into(),
+        data: Arc::new(Vec::new()),
+        link: Some("file:///tmp/linked.png".into()),
+    });
+    let mut pic = shape(&mut p, "Linked", 100.0, 100.0, 200.0, 150.0);
+    pic.kind = ShapeKind::Picture { fill: PictureFill { media, ..Default::default() } };
+    Arc::make_mut(&mut p.slides[0]).shapes.push(pic);
+
+    let bytes = deckcraft_pptx::export(&p).expect("export");
+    let mut zip = zip::ZipArchive::new(std::io::Cursor::new(bytes)).expect("zip");
+    let mut xml = String::new();
+    std::io::Read::read_to_string(&mut zip.by_name("ppt/slides/slide1.xml").expect("slide"), &mut xml).expect("read");
+    assert!(xml.contains(r#"r:link="rId"#), "{xml}");
+    assert!(!xml.contains(r#"r:embed="rId"#), "{xml}");
+    let mut rels = String::new();
+    std::io::Read::read_to_string(&mut zip.by_name("ppt/slides/_rels/slide1.xml.rels").expect("rels"), &mut rels).expect("read");
+    assert!(rels.contains(r#"Target="file:///tmp/linked.png" TargetMode="External""#), "{rels}");
+}

From a837c26eda9503133d41f1403f89f24d31b73671 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:00:05 -0400
Subject: [PATCH 307/376] Engine: Selection pane select uses the checked shape
 id param (#97 after main's selection.select)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/selection.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/cmd/selection.rs b/crates/engine/src/cmd/selection.rs
index 20890418..76eaa706 100644
--- a/crates/engine/src/cmd/selection.rs
+++ b/crates/engine/src/cmd/selection.rs
@@ -28,7 +28,10 @@ pub fn specs() -> Vec<CommandSpec> {
 /// together (Ctrl+click on the other kind is ignored, as in PowerPoint), and picking a hidden
 /// object from the list shows it again.
 fn select(s: &mut Session, p: &Value) -> Result<Value> {
-    let ids = ids_param(p, "ids").or_else(|| id_param(p, "id").map(|i| vec![i])).unwrap_or_default();
+    let ids = match ids_param(p, "ids") {
+        Some(ids) => ids,
+        None => id_param(p, "id", "selection.select")?.map(|i| vec![i]).unwrap_or_default(),
+    };
     let (toggle, add) = (bool_or(p, "toggle", false), bool_or(p, "add", false));
     let st = s.doc()?;
     let in_group = |id: &ShapeId| deckcraft_model::parent_of(st.shapes(), *id).map(|p| p.is_some());

From edaef792e048ef5c8cf9fc4b0c2ee82ca8bb6cc7 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:11:36 -0400
Subject: [PATCH 308/376] Fix up merged PRs: Edit Points hits select their
 shape on right click; Hyperlink sound fields in #713's tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/tools.rs         | 10 +++++++++-
 crates/engine/tests/show_clicks.rs |  2 +-
 crates/pptx/tests/corpus.rs        |  2 ++
 crates/render/src/tests.rs         |  4 ++--
 4 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index 226f372a..feb7d641 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -972,7 +972,15 @@ impl Session {
         }
         let hit = self.hit_test(p, tol);
         let id = match &hit {
-            Some(Hit::Shape { id, .. } | Hit::Resize { id, .. } | Hit::Rotate { id } | Hit::Adjust { id, .. } | Hit::LineEnd { id, .. }) => Some(*id),
+            Some(
+                Hit::Shape { id, .. }
+                | Hit::Resize { id, .. }
+                | Hit::Rotate { id }
+                | Hit::Adjust { id, .. }
+                | Hit::LineEnd { id, .. }
+                | Hit::Handle { id, .. }
+                | Hit::Vertex { id, .. },
+            ) => Some(*id),
             None => None,
         };
         if !id.is_some_and(|id| st.selection.shapes.contains(&id)) {
diff --git a/crates/engine/tests/show_clicks.rs b/crates/engine/tests/show_clicks.rs
index 6fa7d1a0..bc7b93b8 100644
--- a/crates/engine/tests/show_clicks.rs
+++ b/crates/engine/tests/show_clicks.rs
@@ -20,7 +20,7 @@ fn shape(p: &mut Presentation, name: &str, text: &str, x: f64, y: f64, w: f64, h
 }
 
 fn link_to(slide: SlideId) -> Option<Hyperlink> {
-    Some(Hyperlink { action: Action::Slide { slide }, tooltip: String::new(), highlight_click: false })
+    Some(Hyperlink { action: Action::Slide { slide }, tooltip: String::new(), highlight_click: false, sound: None, stop_sound: false })
 }
 
 /// Clicking `trigger` makes `target` disappear.
diff --git a/crates/pptx/tests/corpus.rs b/crates/pptx/tests/corpus.rs
index 1f14f6ee..c37b3555 100644
--- a/crates/pptx/tests/corpus.rs
+++ b/crates/pptx/tests/corpus.rs
@@ -62,6 +62,8 @@ fn talk() -> Presentation {
                                     action: Action::Url { url: "https://example.org/north?q=1&x=2".into() },
                                     tooltip: "Open the report".into(),
                                     highlight_click: false,
+                                    sound: None,
+                                    stop_sound: false,
                                 }),
                                 ..Default::default()
                             },
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 7eedf64c..de42531a 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1743,7 +1743,7 @@ fn east_asian_vertical_text_stands_ideographs_upright() {
 #[test]
 fn placed_shapes_give_the_click_boxes_of_a_slide_in_drawing_order() {
     use deckcraft_model::text::{Action, Hyperlink};
-    let link = Hyperlink { action: Action::NextSlide, tooltip: String::new(), highlight_click: false };
+    let link = Hyperlink { action: Action::NextSlide, tooltip: String::new(), highlight_click: false, sound: None, stop_sound: false };
     let rect = |id: u32, x: f64, click: Option<Hyperlink>| Shape {
         id: ShapeId(id),
         xfrm: Some(Xfrm::new(x, 50.0, 100.0, 40.0)),
@@ -1783,7 +1783,7 @@ fn a_text_hyperlink_belongs_to_the_shape_that_holds_the_text() {
     use deckcraft_model::text::{Action, Hyperlink};
     let mut body = TextBody::from_text("click here");
     for r in &mut body.paragraphs[0].runs {
-        r.props.link = Some(Hyperlink { action: Action::FirstSlide, tooltip: String::new(), highlight_click: false });
+        r.props.link = Some(Hyperlink { action: Action::FirstSlide, tooltip: String::new(), highlight_click: false, sound: None, stop_sound: false });
     }
     let sh = Shape { id: ShapeId(7), xfrm: Some(Xfrm::new(100.0, 100.0, 300.0, 60.0)), text: Some(body), ..Default::default() };
     let placed = place_slide(&deck_with(vec![sh]), 0);

From 47cf76f32c7ef148cd3ee23beaa82a886477b7ec Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:29:27 -0400
Subject: [PATCH 309/376] Fix up merged PRs: handout master csld takes tags;
 corpus test hyperlink gains sound fields

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/pptx/src/write/mod.rs      | 2 +-
 crates/pptx/tests/corpus_kinds.rs | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 228c9379..0ce5af26 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -586,7 +586,7 @@ pub fn export(p: &Presentation, main_ct: &str) -> Result<Vec<u8>, PptxError> {
         x.pkg.rels(&tname, &to.rels);
         let mut w = W::new();
         root_open(&mut w, "p:handoutMaster", A::new());
-        csld(&mut w, &mut x, &mut ho, &hm.name, hm.background.as_ref(), &hm.shapes);
+        csld(&mut w, &mut x, &mut ho, &hm.name, hm.background.as_ref(), &hm.shapes, &[]);
         clr_map(&mut w, &hm.color_map);
         w.close("p:handoutMaster");
         x.pkg.xml_part(handout_path, CT_HANDOUT_MASTER, w.finish());
diff --git a/crates/pptx/tests/corpus_kinds.rs b/crates/pptx/tests/corpus_kinds.rs
index 52dae76e..1f2d2f46 100644
--- a/crates/pptx/tests/corpus_kinds.rs
+++ b/crates/pptx/tests/corpus_kinds.rs
@@ -154,6 +154,8 @@ fn sections() -> Presentation {
                             action: Action::Url { url: "https://example.org/brief?q=1&x=2".into() },
                             tooltip: "Open the brief".into(),
                             highlight_click: false,
+                            sound: None,
+                            stop_sound: false,
                         }),
                         ..Default::default()
                     },

From 4c1357b2e66b4a2351b25f6a7ead4d962ea73d91 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:29:52 -0400
Subject: [PATCH 310/376] Fix up merged PRs: shape.action fills main's new
 Hyperlink sound fields and CustomShow returns

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/insert.rs | 4 ++--
 crates/ui-egui/src/dialogs.rs   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/crates/engine/src/cmd/insert.rs b/crates/engine/src/cmd/insert.rs
index 930b4356..64eff386 100644
--- a/crates/engine/src/cmd/insert.rs
+++ b/crates/engine/src/cmd/insert.rs
@@ -686,7 +686,7 @@ fn shape_action(s: &mut Session, p: &Value) -> Result<Value> {
             if !s.doc()?.doc.custom_shows.iter().any(|c| c.name == name) {
                 return Err(bad(CMD, format!("no custom show `{name}`")));
             }
-            Some(Action::CustomShow { name })
+            Some(Action::CustomShow { name, returns: true })
         }
         "program" => Some(Action::Program { path: need("path")? }),
         "slide" => {
@@ -698,7 +698,7 @@ fn shape_action(s: &mut Session, p: &Value) -> Result<Value> {
     };
     let highlight = bool_param(p, "highlight").unwrap_or(true);
     let tooltip = str_param(p, "tooltip").unwrap_or("").to_string();
-    let link = action.map(|action| Hyperlink { action, tooltip, highlight_click: highlight });
+    let link = action.map(|action| Hyperlink { action, tooltip, highlight_click: highlight, sound: None, stop_sound: false });
     edit_shapes(s, p, CMD, |sh| {
         if hover {
             sh.hover = link.clone();
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 60880b16..3ae2e03d 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -486,7 +486,7 @@ fn body(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
                 Some(Action::EndShow) => ("endShow", String::new()),
                 Some(Action::PlayMedia) => ("playMedia", String::new()),
                 Some(Action::Url { url }) => ("url", url.clone()),
-                Some(Action::CustomShow { name }) => ("customShow", name.clone()),
+                Some(Action::CustomShow { name, .. }) => ("customShow", name.clone()),
                 Some(Action::Program { path }) => ("program", path.clone()),
                 Some(Action::Slide { slide }) => ("slide", slides.iter().position(|(id, _)| id == slide).unwrap_or(0).to_string()),
             };

From 4653cb4e18e34fd4ba1f09424fa8769ea2059089 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:30:15 -0400
Subject: [PATCH 311/376] Fix up merged PRs: Hyperlink dialog tests fill main's
 new sound fields

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/dialogs.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index b2047412..63a85070 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -1527,7 +1527,7 @@ mod tests {
     };
 
     fn link(action: Action, tip: &str) -> Hyperlink {
-        Hyperlink { action, tooltip: tip.into(), highlight_click: false }
+        Hyperlink { action, tooltip: tip.into(), highlight_click: false, sound: None, stop_sound: false }
     }
 
     fn url(address: &str, tip: &str) -> Hyperlink {

From 2f6629c4cb0708c1d077772527bcdcbf0579e5fb Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:37:42 -0400
Subject: [PATCH 312/376] Fix up merged PRs: theme browsing's importer sets
 vml_previews (#530 after #209-era field)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/pptx/src/read/mod.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index aa6bcdcf..1e5b4c6b 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -284,6 +284,7 @@ pub fn import_theme(bytes: &[u8]) -> Result<(deckcraft_model::theme::Theme, Vec<
         slide_by_part: HashMap::new(),
         custom_show_names: HashMap::new(),
         table_style_ids: Vec::new(),
+        vml_previews: HashMap::new(),
     };
     let part = Part::new(&pkg, &theme_path, &doc);
     let theme = theme::read_theme(&mut imp, &part, &doc.root);

From 0376c0b0e137111cb691d76402cdd8aa2f2671c3 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:41:30 -0400
Subject: [PATCH 313/376] Fix up merged PRs: one parity summary, one dialogs
 gap entry, no duplicated architecture rows

Recomputed docs/parity-checklist.md's summary with cargo xtask parity.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 docs/architecture.md     |  2 --
 docs/gaps.md             |  8 ++------
 docs/parity-checklist.md | 12 ++++--------
 3 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/docs/architecture.md b/docs/architecture.md
index b1a64f63..da57f5bb 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -26,8 +26,6 @@ nothing below L6 uses egui, eframe, winit or rfd.
 | L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (228 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
 | L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
diff --git a/docs/gaps.md b/docs/gaps.md
index b820ac27..eee83d1b 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -300,12 +300,8 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). Size and Position is one of the 28. 8–14 h.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). Date and Time is in. 8–14 h.
+- **Dialogs**: 30 dialogs vs PowerPoint's ~60 (Font, Find/Replace dialog, Replace Fonts, Print,
+  Insert Object…). Size and Position, Bullets and Numbering, Action Settings and Date and Time are in. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index eb6cf53b..10f21882 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -8,12 +8,8 @@ The summary between `<!-- SUMMARY -->
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 39 | 20 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 16 | 25 | 39% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 16 | 25 | 39% |
+| P1 | 65 | 39 | 21 | 5 | 76% |
+| P2 | 54 | 14 | 17 | 23 | 42% |
 
 | Area | Parity |
 |---|---|
@@ -22,7 +18,7 @@ The summary between `<!-- SUMMARY -->
 | Slides | 90% |
 | Views | 93% |
 | Masters & themes | 85% |
-| Shapes | 88% |
+| Shapes | 91% |
 | Format | 83% |
 | Arrange | 100% |
 | Text | 80% |
@@ -31,7 +27,7 @@ The summary between `<!-- SUMMARY -->
 | SmartArt | 50% |
 | Pictures | 48% |
 | Media | 67% |
-| Transitions | 92% |
+| Transitions | 100% |
 | Animations | 79% |
 | Slide show | 66% |
 | Review | 60% |

From b5499d7157081452735e8a1d13dc253cf6469c40 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:41:50 -0400
Subject: [PATCH 314/376] Fix up merged PRs: waterfall axis scale uses the
 running totals

main's axis_scale now reads plotted_extent rather than value_range, which #537
taught about waterfalls; route waterfall charts to value_range there too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/model/src/chart.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index 694d06cd..42a8378d 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -369,6 +369,9 @@ impl Chart {
     /// stacked series as running sums from zero, 100 % series as 0–1. `(0, 0)` without finite
     /// values; `None` when no series uses the axis.
     fn plotted_extent(&self, secondary: bool) -> Option<(f64, f64)> {
+        if self.kind == ChartType::Waterfall {
+            return (!secondary).then(|| self.value_range());
+        }
         let ser: Vec<&Series> = self.series.iter().filter(|s| self.on_secondary(s) == secondary).collect();
         if ser.is_empty() {
             return (!secondary && self.kind != ChartType::Combo).then_some((0.0, 0.0));

From 7d87b6e6683295d08cb2af96edf334be30d4ab9a Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:45:01 -0400
Subject: [PATCH 315/376] Fix up merged PRs: transition sounds and media cues
 pass the document uid

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/show.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index d617254b..32145e48 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -442,7 +442,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         show.cue_media(&doc, step, now - show.step_start);
     }
     show_media(app, &mut show, doc_uid, &doc);
-    run_media_cues(app, &mut show, &doc);
+    run_media_cues(app, &mut show, doc_uid, &doc);
     // Draw.
     let full = ui.max_rect();
     let painter = ui.painter_at(full);
@@ -792,7 +792,7 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc_uid: u64, doc: &Presentat
     if let Some(media) = sound {
         // Loop Until Next Sound: it repeats until another slide's sound or Stop Previous Sound.
         let clip = deckcraft_model::MediaClip { media, volume: 1.0, loop_play: sound_loop, ..Default::default() };
-        app.media.play(doc, TRANSITION_SOUND, &clip, None, crate::media::Owner::Show);
+        app.media.play(doc_uid, doc, TRANSITION_SOUND, &clip, None, crate::media::Owner::Show);
     }
     if let Some(i) = cur {
         for (id, _, clip) in crate::media::slide_media(doc, i) {
@@ -805,15 +805,15 @@ fn show_media(app: &mut SlideApp, show: &mut Show, doc_uid: u64, doc: &Presentat
 
 /// Carry out the media effects the show's steps set off: Play starts from the beginning unless
 /// the clip is already playing, Pause toggles, Stop stops.
-fn run_media_cues(app: &mut SlideApp, show: &mut Show, doc: &Presentation) {
+fn run_media_cues(app: &mut SlideApp, show: &mut Show, doc_uid: u64, doc: &Presentation) {
     for (id, effect) in std::mem::take(&mut show.media_cues) {
         let Some(clip) = crate::media::find_clip(doc, id) else { continue };
         match effect.as_str() {
-            "pause" => app.media.toggle(doc, id, &clip, crate::media::Owner::Show),
+            "pause" => app.media.toggle(doc_uid, doc, id, &clip, crate::media::Owner::Show),
             "stop" => app.media.stop(id),
             // Already playing (it also starts automatically): leave it running.
             _ if app.media.is_playing(id) => {}
-            _ => app.media.play(doc, id, &clip, Some(0.0), crate::media::Owner::Show),
+            _ => app.media.play(doc_uid, doc, id, &clip, Some(0.0), crate::media::Owner::Show),
         }
     }
 }

From 0a470c3b1fa4f6e87c529ea8bf00f66d786c5834 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:45:41 -0400
Subject: [PATCH 316/376] Fix up merged PRs: prefetch GIF check passes the
 document uid

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/show.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index dbf59930..8bcbfa43 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -584,7 +584,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         // frame depends on when it is entered).
         if !animating && show.trans.is_none() && !show.preview_only {
             let next = deckcraft_anim::show_order(&doc).into_iter().find(|i| *i > idx);
-            let wanted = next.filter(|n| app.media.gifs(&doc, *n, now, &app.session.gif_paused).is_empty());
+            let wanted = next.filter(|n| app.media.gifs(doc_uid, &doc, *n, now, &app.session.gif_paused).is_empty());
             if let Some(n) = wanted
                 && show.prefetch.as_ref().is_none_or(|p| p.key.slide != n || p.key.size != size || p.key.doc != std::sync::Arc::as_ptr(&doc) as usize)
             {

From 32a49e8bf66c7552432df5783b22f3d951c17026 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:47:08 -0400
Subject: [PATCH 317/376] Fix up merged PRs: a trendline caption in a tiny
 chart no longer panics

f64::clamp panics when the plot is narrower than the caption's minimum width;
use main's clamp_soft, as the rest of the chart code now does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/render/src/chart.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index f90ab549..1e481510 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -860,7 +860,7 @@ fn draw_trendlines(
             let lines = caption.chars().filter(|ch| *ch == '\n').count() + 1;
             let box_h = base * 1.3 * lines as f64 + 2.0;
             let widest = caption.lines().map(|l| l.chars().count()).max().unwrap_or(1) as f64;
-            let box_w = (widest * base * 0.62).clamp(48.0, plot.width() * 0.72);
+            let box_w = clamp_soft(widest * base * 0.62, 48.0, plot.width() * 0.72);
             let (x, y) = caption_at(plot, box_w, box_h, &ink_pts, label_n);
             ctx.set_transform(m);
             ctx.set_paint(color(Rgba::WHITE, 1.0));

From 0f28ac96ed63a985bfc78d2072382712f788a4a8 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:49:35 -0400
Subject: [PATCH 318/376] Fix up merged PRs: reversed category axes and
 trendline forecasts agree

#640 orders category slots bottom-to-top on horizontal bars (or reversed via
c:orientation) while #603 pads the axis for trendline forecasts. Slots now
include the forecast padding on the right side, and trendlines map their
category positions through the same slot order as the bars.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/render/src/chart.rs | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index fe8df06a..4622e9c6 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -650,7 +650,9 @@ fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64,
             }
         }
     }
-    draw_trendlines(ctx, rctx, c, m, plot, band, back, ncat, horiz, base, text_col, &to_axis);
+    // A category position (0-based, fractional) as a slot, the way `slot` places the bars.
+    let slot_at = |x: f64| if backwards { ncat as f64 - 1.0 - x + fwd } else { x + back };
+    draw_trendlines(ctx, rctx, c, m, plot, band, &slot_at, ncat, horiz, base, text_col, &to_axis);
     // Axis line.
     let mut ax = BezPath::new();
     if horiz {
@@ -744,7 +746,7 @@ const TREND_INK: [Rgba; 4] = [Rgba::rgb(0x22, 0x22, 0x22), Rgba::rgb(0xB0, 0x30,
 fn map_xy(
     plot: Rect,
     band: f64,
-    back: f64,
+    slot: &impl Fn(f64) -> f64,
     horiz: bool,
     scatter: bool,
     sx0: f64,
@@ -765,7 +767,7 @@ fn map_xy(
         plot.x0 + (x - sx0) / (sx1 - sx0) * plot.width()
     } else {
         let origin = if horiz { plot.y0 } else { plot.x0 };
-        origin + band * (x - 1.0 + back + 0.5)
+        origin + band * (slot(x - 1.0) + 0.5)
     };
     if !along.is_finite() {
         return None;
@@ -811,7 +813,7 @@ fn draw_trendlines(
     m: Affine,
     plot: Rect,
     band: f64,
-    back: f64,
+    slot: &impl Fn(f64) -> f64,
     ncat: usize,
     horiz: bool,
     base: f64,
@@ -861,8 +863,8 @@ fn draw_trendlines(
             let mut any = false;
             for w in samples.windows(2) {
                 let (Some(a), Some(b)) = (
-                    map_xy(plot, band, back, horiz, scatter, sx0, sx1, sec, w[0].0, w[0].1, to_axis),
-                    map_xy(plot, band, back, horiz, scatter, sx0, sx1, sec, w[1].0, w[1].1, to_axis),
+                    map_xy(plot, band, slot, horiz, scatter, sx0, sx1, sec, w[0].0, w[0].1, to_axis),
+                    map_xy(plot, band, slot, horiz, scatter, sx0, sx1, sec, w[1].0, w[1].1, to_axis),
                 ) else {
                     prev = None;
                     continue;

From b61cf33836d7e662b69026a0511eafdfd7fdd267 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:49:36 -0400
Subject: [PATCH 319/376] Fix up merged PRs: custom-show links carry 'returns';
 prefetch follows the show's own order

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/anim/src/show.rs    | 2 +-
 crates/anim/src/tests.rs   | 4 ++--
 crates/ui-egui/src/show.rs | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/crates/anim/src/show.rs b/crates/anim/src/show.rs
index 2c49cc0c..0f71113b 100644
--- a/crates/anim/src/show.rs
+++ b/crates/anim/src/show.rs
@@ -347,7 +347,7 @@ impl ShowState {
             Action::FirstSlide => self.visit(pres).first().copied(),
             Action::LastSlide => self.visit(pres).last().copied(),
             Action::LastViewed => last_viewed,
-            Action::CustomShow { name } => {
+            Action::CustomShow { name, .. } => {
                 let Some(order) = custom_indices(pres, name) else { return LinkJump::None };
                 let Some(&i) = order.first() else { return LinkJump::None };
                 self.order = Some(order);
diff --git a/crates/anim/src/tests.rs b/crates/anim/src/tests.rs
index f8fdfd4b..ab4d5146 100644
--- a/crates/anim/src/tests.rs
+++ b/crates/anim/src/tests.rs
@@ -726,10 +726,10 @@ fn playing_a_custom_show_stays_on_its_slides() {
 
     let mut s = ShowState::new(&p);
     p.slides[4] = Arc::new(Slide { id: SlideId(1004), ..Default::default() });
-    assert_eq!(s.follow(&p, &Action::CustomShow { name: "Ends".into() }, None), LinkJump::Show(ShowAction::Slide(0)));
+    assert_eq!(s.follow(&p, &Action::CustomShow { name: "Ends".into(), returns: true }, None), LinkJump::Show(ShowAction::Slide(0)));
     assert_eq!(s.custom_name(), Some("Ends"));
     assert_eq!(s.next(&p), ShowAction::Slide(4));
-    assert_eq!(s.follow(&p, &Action::CustomShow { name: "Missing".into() }, None), LinkJump::None);
+    assert_eq!(s.follow(&p, &Action::CustomShow { name: "Missing".into(), returns: true }, None), LinkJump::None);
     assert_eq!(s.slide, 4, "an unknown custom show leaves the current slide");
 }
 
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index e23e8575..b3ac7f3a 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -693,7 +693,7 @@ pub fn ui(app: &mut SlideApp, ui: &mut Ui) {
         // While this slide rests, render the next one's first frame (not one with GIFs, whose
         // frame depends on when it is entered).
         if !animating && show.trans.is_none() && !show.preview_only {
-            let next = deckcraft_anim::show_order(&doc).into_iter().find(|i| *i > idx);
+            let next = show.state.peek_next(&doc);
             let wanted = next.filter(|n| app.media.gifs(doc_uid, &doc, *n, now, &app.session.gif_paused).is_empty());
             if let Some(n) = wanted
                 && show.prefetch.as_ref().is_none_or(|p| p.key.slide != n || p.key.size != size || p.key.doc != std::sync::Arc::as_ptr(&doc) as usize)

From 6902c4bf92ffec0617c943a25d04985372ed836a Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:50:27 -0400
Subject: [PATCH 320/376] Fix up merged PRs: every presenter-view button uses
 the light-on-dark style (#221)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/show.rs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index fe345e28..5bb57e59 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -1749,22 +1749,22 @@ fn presenter_window(ctx: &egui::Context, show: &mut Show, doc: &Presentation, no
                     });
                 });
                 ui.horizontal(|ui| {
-                    if ui.button(if paused { "Resume" } else { "Pause" }).clicked() {
+                    if button(ui, if paused { "Resume" } else { "Pause" }).clicked() {
                         show.timer.toggle(now);
                     }
-                    if ui.button("Reset").clicked() {
+                    if button(ui, "Reset").clicked() {
                         show.timer.reset(now);
                     }
-                    if ui.button(if show.blank == Some(Color32::BLACK) { "Black on" } else { "Black" }).clicked() {
+                    if button(ui, if show.blank == Some(Color32::BLACK) { "Black on" } else { "Black" }).clicked() {
                         toggle_blank(show, Color32::BLACK);
                     }
-                    if ui.button(if show.blank == Some(Color32::WHITE) { "White on" } else { "White" }).clicked() {
+                    if button(ui, if show.blank == Some(Color32::WHITE) { "White on" } else { "White" }).clicked() {
                         toggle_blank(show, Color32::WHITE);
                     }
-                    if ui.button(if show.grid { "All slides on" } else { "All slides" }).clicked() {
+                    if button(ui, if show.grid { "All slides on" } else { "All slides" }).clicked() {
                         show.grid = !show.grid;
                     }
-                    if ui.button(show.zoom_label()).clicked() {
+                    if button(ui, show.zoom_label()).clicked() {
                         show.zoom_key();
                     }
                 });

From 5089d615bfbee0c860c40fc5d99d428f264d1479 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:50:37 -0400
Subject: [PATCH 321/376] Fix up merged PRs: scatter trendlines follow the
 value x axis

#662 gives scatter and bubble charts one x scale over every series; #603's
trendlines still mapped x over each series' own extent, so a fit drifted off
its points. Use the chart's x scale where there is one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/render/src/chart.rs | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index 822f1bfd..5b2017a3 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -690,7 +690,7 @@ fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64,
     }
     // A category position (0-based, fractional) as a slot, the way `slot` places the bars.
     let slot_at = |x: f64| if backwards { ncat as f64 - 1.0 - x + fwd } else { x + back };
-    draw_trendlines(ctx, rctx, c, m, plot, band, &slot_at, ncat, horiz, base, text_col, &to_axis);
+    draw_trendlines(ctx, rctx, c, m, plot, band, &slot_at, xscale, ncat, horiz, base, text_col, &to_axis);
     // Axis line.
     let mut ax = BezPath::new();
     if horiz {
@@ -852,6 +852,7 @@ fn draw_trendlines(
     plot: Rect,
     band: f64,
     slot: &impl Fn(f64) -> f64,
+    xscale: Option<(f64, f64, f64)>,
     ncat: usize,
     horiz: bool,
     base: f64,
@@ -879,8 +880,11 @@ fn draw_trendlines(
             xs.push(x);
             ys.push(y);
         }
-        // The same x extent the scatter marks use, so the fit sits on the points.
-        let (sx0, sx1) = if scatter {
+        // The same x extent the scatter marks use, so the fit sits on the points: the chart's
+        // value x axis where it has one, else the series' own x values.
+        let (sx0, sx1) = if let (true, Some((lo, hi, _))) = (scatter, xscale) {
+            (lo, hi)
+        } else if scatter {
             let mut lo = f64::MAX;
             let mut hi = f64::MIN;
             for v in s.x_values.iter().copied().flatten().filter(|v| v.is_finite()) {

From 0ac222a5437d0763adb023b05bd041a580973600 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:51:49 -0400
Subject: [PATCH 322/376] Fix up merged PRs: split ribbon buttons carry their
 label once (#512's label predates main's)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/widgets.rs | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/crates/ui-egui/src/widgets.rs b/crates/ui-egui/src/widgets.rs
index 47fc53a4..63ab3934 100644
--- a/crates/ui-egui/src/widgets.rs
+++ b/crates/ui-egui/src/widgets.rs
@@ -124,10 +124,6 @@ pub fn small_button_ex(ui: &mut Ui, icon: Icon, label: &str, enabled: bool, sele
     let main_rect = Rect::from_min_max(rect.min, pos2(rect.max.x - arrow_w, rect.max.y));
     let main_resp =
         if split { ui.interact(main_rect, resp.id.with("m"), if enabled { Sense::click() } else { Sense::hover() }) } else { resp.clone() };
-    // Screen readers (and UI tests) find the button by its text.
-    if !label.is_empty() {
-        main_resp.widget_info(|| egui::WidgetInfo::labeled(egui::WidgetType::Button, enabled, label));
-    }
     let arrow_resp = split.then(|| {
         ui.interact(
             Rect::from_min_max(pos2(rect.max.x - arrow_w, rect.min.y), rect.max),

From f9c1000e356ad0bdfb6d57709c830783d3895968 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:51:53 -0400
Subject: [PATCH 323/376] Fix up merged PRs: rustfmt; drop doc rows the union
 merge left twice

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 ROADMAP.md                   |  2 --
 crates/engine/src/cmd/mod.rs |  2 +-
 docs/control-protocol.md     |  2 --
 docs/file-format-parity.md   | 17 ++++++-----------
 docs/gaps.md                 |  5 -----
 docs/parity-checklist.md     |  2 --
 docs/slideshow-parity.md     |  8 +-------
 7 files changed, 8 insertions(+), 30 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index dbfa8213..27b9d9f8 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -139,8 +139,6 @@ Ranked; detail and the full beta plan in [docs/roadmap.md](docs/roadmap.md).
    corpus, embedded fonts, #70, #74, #77, EMF/WMF and SVG. 36–64 h.
 2. **PPTX on real decks:** owned corpus, round-trip checks, fixes; #70, #74, #77; EMF/WMF and SVG.
    `corpus_media.rs` keeps 3-D models and animation bounce end. 36–64 h.
-2. **PPTX on real decks:** a larger owned corpus and the remaining round-trip losses; #70, #74, #77;
-   EMF/WMF and SVG. 36–64 h.
 3. **Localization:** catalog, system language (#15), zh-Hans, es, fr, de, ja with IME. 27–46 h.
 4. **Output:** vector PDF, printing. 10–16 h.
 5. **Depth that users hit:** font weights (#69), chart data and elements, Animation Pane timeline,
diff --git a/crates/engine/src/cmd/mod.rs b/crates/engine/src/cmd/mod.rs
index 6f5825a9..dcfa20db 100644
--- a/crates/engine/src/cmd/mod.rs
+++ b/crates/engine/src/cmd/mod.rs
@@ -2,8 +2,8 @@
 
 pub mod animation;
 pub mod arrange;
-pub mod background;
 pub mod artistic;
+pub mod background;
 pub mod design;
 pub mod edit;
 pub mod file;
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index abb982d7..0b7909de 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -18,8 +18,6 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `ui.inspect` | — | UI state, active tool, window/canvas/slide rects, dialog, `home` (the File tab open over a presentation), `backstage` (its page, also the start screen), slide show state (`grid`, `zoomArm`, `zoom`, `blank`, `presenterPaused`, `presenterSecs`, `notesPx`, `custom`, `goto`; `cells` while See All Slides is open), documents, perf (fps, render ms) |
 | `ui.tool.select` | `{tool, preset?}` | `select`, `text`, `shape` + preset, any preset name, `curve`, `freeform`, `scribble`, `pen`, `highlighter`, `eraser` |
 | `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick\|contextclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse (`contextclick`: the right-button press that selects before the context menu) |
-| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show) |
-| `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
 | `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show: digits then Enter go to that slide, G is See All Slides, Z arms zoom, T pauses the presenter timer, R resets it, `[` and `]` change notes size, Esc clears a slide number, the grid and zoom before it leaves the show) |
 | `ui.ime` | `{preedit, active?: [start, end]}` / `{commit}` | An input method's composition through egui, as a real one arrives: shown in place on the slide or in a focused field; `{"preedit": ""}` cancels |
 | `ui.move` / `ui.click` / `ui.drag` | screen points | Real egui pointer input — reaches every widget, menu and pane |
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index f592b52f..f6df0c8d 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -76,10 +76,8 @@ the round trip even though DeckCraft doesn't model it.
 | Presentation, slide size, sections (p14), custom shows | yes | yes | |
 | Slide masters, layouts, placeholders and inheritance | yes | yes | |
 | Themes: colour, font (Latin/EA/CS), effect schemes, background styles | yes | yes | Unknown theme parts kept |
-| Notes slides and notes master | yes | yes | Header, footer, date and slide-number text on the notes master is kept. No notes-master editing view |
-| Handout master | no | no | |
-| Notes slides and notes master | yes | yes | No notes-master editing view |
-| Handout master | yes | yes | Header, footer, date and slide-number text is kept. No handout-master editing view |
+| Notes slides and notes master | yes | yes | Header, footer, date and slide-number text on the notes master is kept. Edited in View ▸ Notes Master |
+| Handout master | yes | yes | Header, footer, date and slide-number text is kept. Edited in View ▸ Handout Master |
 | Shapes: preset geometry (~180 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in `crates/geom/src/preset.rs` (and `preset/extra.rs`). Outlines, dashes, arrowheads and ink inside a group, and text, keep their size in points whatever the group's child-coordinate scale (#233). |
 | Fills: solid, gradient, picture (stretch/tile/crop), pattern, group | yes | yes | |
 | Lines: dash, compound, caps, joins, arrowheads | yes | yes | |
@@ -116,13 +114,10 @@ the round trip even though DeckCraft doesn't model it.
 ### What would move the PPTX number
 
 1. A larger owned corpus (corporate templates, SmartArt, chartex charts, EMF, embedded fonts,
-   every transition and animation) in a corpus repo. `crates/pptx/tests/corpus.rs` already checks
-   open → save → reopen (parts and text) for decks we author. Still needed: render checks and a
-   PowerPoint reference render for each (owner runs PowerPoint).
-1. A larger owned corpus (corporate templates, SmartArt, chartex charts, EMF, embedded fonts,
-   every transition and animation) in a corpus repo, with a PowerPoint reference render for each.
-   `crates/pptx/tests/corpus_kinds.rs` already checks tables, charts, animations, media, sections
-   and masters/layouts (open → save → reopen).
+   every transition and animation) in a corpus repo. `crates/pptx/tests/corpus.rs` and
+   `corpus_kinds.rs` already check open → save → reopen (parts and text) for decks we author:
+   tables, charts, animations, media, sections and masters/layouts among them. Still needed:
+   render checks and a PowerPoint reference render for each (owner runs PowerPoint).
 2. The round-trip losses above (#70, #74, #77).
 3. SVG rendering. EMF+ records inside EMF/WMF are still not drawn.
 
diff --git a/docs/gaps.md b/docs/gaps.md
index efd21e33..5bcd70a0 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -123,7 +123,6 @@ Detail in [file-format-parity.md](file-format-parity.md).
   exist to compare against. `corpus_charts.rs` round-trips one owned slice (a combo chart with
   data labels and trendlines, a merged table with diagonal borders, text columns, autofit,
   vertical text and a WordArt warp). That is still a generated deck, not a corpus of real ones.
-### PPTX corpus is only decks we author
 - **Evidence:** `crates/pptx/tests/corpus_kinds.rs` builds decks in this repo and checks open → save →
   reopen (package parts and text): tables, charts, animations, media, sections, and several masters
   and layouts. A handout master with a header, footer, date and slide number used to disappear on
@@ -133,10 +132,6 @@ Detail in [file-format-parity.md](file-format-parity.md).
 - **Estimate:** 20–35 h: grow the owned corpus in `storytold/photocraft-corpus` style (craftrules
   `standards/test-corpora.md`), add render checks, have the owner open outputs in PowerPoint, fix
   what breaks. **Beta blocker.**
-  (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is still mostly unknown.
-- **Estimate:** 20–35 h: build an owned corpus in `storytold/photocraft-corpus` style (craftrules
-  `standards/test-corpora.md`), add import → render → export → re-import checks, have the owner open
-  outputs in PowerPoint, fix what breaks. **Beta blocker.**
 
 ### Round trip loses media playback options and animation rewind (#74, #77)
 - **Evidence:** issues filed 2026-10-10 by an automated reviewer; media playback options and the
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index eae5e36a..0ce1a52e 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -12,8 +12,6 @@ The summary between `<!-- SUMMARY -->
 | P2 | 54 | 13 | 15 | 26 | 38% |
 | P1 | 65 | 38 | 21 | 6 | 75% |
 | P2 | 54 | 13 | 16 | 25 | 39% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 16 | 25 | 39% |
 
 | Area | Parity |
 |---|---|
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index 5eb32d6c..129070be 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -35,11 +35,8 @@ ready** (estimated), **10–16 h** to parity.
 | Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable |
 | Media playback with controls, play across slides, full-screen video | yes | yes | Seeks and loops preserve new-generation video frames and end-of-stream; queue regression and repeated seeks across H.264/HEVC/VP9/AV1 in `crates/media`. WMA/WMV not decodable |
 | Media playback with controls, play across slides, full-screen video, Play/Pause/Stop in the click sequence | yes | yes | WMA/WMV not decodable; click sequence since #116 |
-| Animated GIFs play; pause from their corner button | yes | yes (#39) | |
 | Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable. Slide Show ▸ Show Media Controls (on by default) hides the playback bar |
 | Animated GIFs play; pause from their corner button | yes | yes (#39) | The corner button hides with Show Media Controls |
-| See All Slides grid during the show | yes | no | |
-| Zoom into part of a slide during the show | yes | no | |
 | See All Slides grid during the show | yes | yes: G, or All on the show bar and in presenter view; click a thumbnail, Esc closes the grid | Hidden slides are labelled; the first 48 slides are shown |
 | Zoom into part of a slide during the show | yes | yes: Z, then click the slide (or the presenter slide); 2×, Esc or another click leaves it | The presenter keeps the whole slide and draws a frame on the zoomed part |
 | Pen and highlighter ink | yes | pen only (Cmd+P pen, Cmd+A arrow, E erases all ink) | No highlighter, per-stroke eraser, ink colours, or keep/discard annotations prompt |
@@ -58,11 +55,8 @@ ready** (estimated), **10–16 h** to parity.
 | Pause / reset timer, clock | yes | yes: Pause/Resume and Reset in presenter view (T pauses, R resets); the clock is local time, `--:--` where there is no clock | Pausing the timer does not pause the show, animations or rehearsal |
 | Slide counter, previous/next/end buttons | yes | yes | |
 | Keyboard navigation while Presenter View has focus | yes | yes | Shares the audience window's key handling; handled keys are consumed before buttons, and the presenter stays available at the end screen |
-| Notes font size, scrolling | yes | scrolling only | |
-| Placed on the presenter's display automatically, show on the projector | yes | **no**: opens wherever the OS puts it | Beta blocker, 3–5 h |
-| Swap displays | yes | no | |
 | Notes font size, scrolling | yes | yes: A- / A+ (and `[` / `]`), 12–48 pt in steps of 4, default 18; the notes scroll | |
-| Placed on the presenter's display automatically, show on the projector | yes | **no**: opens wherever the OS puts it | Open PR #433 places the show on a second display when one is attached. This change does not |
+| Placed on the presenter's display automatically, show on the projector | yes | **no**: opens wherever the OS puts it | Beta blocker, 3–5 h. Open PR #433 places the show on a second display when one is attached. This change does not |
 | Swap displays | yes | no | Still open on #433 |
 | Pen, laser, black screen, zoom from presenter view | yes | Black, White and Zoom buttons; the audience zoom is framed on the presenter slide | Pen and the laser pointer are still keys only; there is no laser yet |
 | See all slides from presenter view | yes | yes: All slides opens the grid on the show | |

From bb3627f9549130b3e0f1107b70f3f185046aa135 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:53:06 -0400
Subject: [PATCH 324/376] Fix up merged PRs: minor gridlines on a logarithmic
 axis

#666's minor gridlines stepped in value units, but #669 scales a log axis in
exponents of its base; map each minor step back through the base.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/render/src/chart.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crates/render/src/chart.rs b/crates/render/src/chart.rs
index 54d989f8..c6f35fdc 100644
--- a/crates/render/src/chart.rs
+++ b/crates/render/src/chart.rs
@@ -411,7 +411,9 @@ fn draw_inner(ctx: &mut RenderContext, rctx: &Ctx, c: &Chart, m: Affine, w: f64,
         let n = (((max - min) / minor.max(1e-12)).round() as i64).clamp(1, 500);
         let mut g = BezPath::new();
         for k in (0..=n).filter(|k| k % 5 != 0) {
-            let pos = to_v(min + k as f64 * minor);
+            // On a logarithmic axis `min`, `max` and `step` are exponents of the base.
+            let e = min + k as f64 * minor;
+            let pos = to_v(log.map_or(e, |(b, _)| b.powf(e)));
             if horiz {
                 g.move_to((pos, plot.y0));
                 g.line_to((pos, plot.y1));

From 5c7e9fc6c3013d5eca57404128d3a114fc77778b Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:53:13 -0400
Subject: [PATCH 325/376] Format the merged PRs (cargo fmt)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index ae207d1d..50a92942 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1258,12 +1258,12 @@ fn js_now() -> f64 {
 #[cfg(test)]
 mod animpane_tests;
 #[cfg(test)]
+mod browsetheme_tests;
+#[cfg(test)]
 mod eyedropper_tests;
 #[cfg(test)]
 mod huge_deck_tests;
 #[cfg(test)]
-mod browsetheme_tests;
-#[cfg(test)]
 mod ime_tests;
 #[cfg(test)]
 mod replacefonts_tests;

From 3450180f19bafec9cfe26a21e5d5d9d26c60e33e Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:55:38 -0400
Subject: [PATCH 326/376] Fix up merged PRs: EMF+ clipping alongside GDI clip
 regions

main added its own clip.rs (GDI rectangle regions carried on every drawn
item); #582 added a clip.rs that cuts drawing geometrically to the EMF+ clip
rectangle. Keep main's module, move #582's to cliprect.rs, keep the EMF+
rectangle on the canvas as plus_clip, and carry the region field through the
geometric clipper.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/metafile/src/canvas.rs   |  4 ++--
 crates/metafile/src/cliprect.rs | 20 ++++++++++----------
 crates/metafile/src/tests.rs    |  2 +-
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/crates/metafile/src/canvas.rs b/crates/metafile/src/canvas.rs
index 7a661fac..2745a465 100644
--- a/crates/metafile/src/canvas.rs
+++ b/crates/metafile/src/canvas.rs
@@ -536,7 +536,7 @@ impl Canvas {
         let dev: Vec<Op> = ops.iter().map(|o| self.map_op(*o)).collect();
         if dev.len() >= 2 {
             let even_odd = self.even_odd;
-            self.push(Raw::Pattern { ops: dev, even_odd, tile });
+            self.push(Raw::Pattern { ops: dev, even_odd, tile, region: None });
         }
     }
 
@@ -564,7 +564,7 @@ impl Canvas {
             }
         }
         let even_odd = self.even_odd;
-        self.push(Raw::Pattern { ops: dev, even_odd, tile: Arc::new(RawTile { w, h, px, cell }) });
+        self.push(Raw::Pattern { ops: dev, even_odd, tile: Arc::new(RawTile { w, h, px, cell }), region: None });
     }
 
     /// Pushes the drawing state. Past [`MAX_STACK`] levels the parse stops, since later restores
diff --git a/crates/metafile/src/cliprect.rs b/crates/metafile/src/cliprect.rs
index 882affbd..652ad35b 100644
--- a/crates/metafile/src/cliprect.rs
+++ b/crates/metafile/src/cliprect.rs
@@ -48,10 +48,10 @@ fn disjoint(b: [f64; 4], c: [f64; 4]) -> bool {
 /// Clips one drawn item; a shape that is both filled and stroked comes back as two items.
 pub(crate) fn clip_raw(raw: Raw, c: [f64; 4]) -> Vec<Raw> {
     match raw {
-        Raw::Path { ops, fill, stroke, even_odd } => {
+        Raw::Path { ops, fill, stroke, even_odd, region } => {
             let Some(b) = ops_bbox(&ops) else { return Vec::new() };
             if inside(b, c) {
-                return vec![Raw::Path { ops, fill, stroke, even_odd }];
+                return vec![Raw::Path { ops, fill, stroke, even_odd, region }];
             }
             if disjoint(b, c) {
                 return Vec::new();
@@ -61,33 +61,33 @@ pub(crate) fn clip_raw(raw: Raw, c: [f64; 4]) -> Vec<Raw> {
             if fill.is_some() {
                 let f = clip_fill(&subs, c);
                 if !f.is_empty() {
-                    out.push(Raw::Path { ops: f, fill, stroke: None, even_odd });
+                    out.push(Raw::Path { ops: f, fill, stroke: None, even_odd, region: region.clone() });
                 }
             }
             if stroke.is_some() {
                 let s = clip_stroke(&subs, c);
                 if !s.is_empty() {
-                    out.push(Raw::Path { ops: s, fill: None, stroke, even_odd });
+                    out.push(Raw::Path { ops: s, fill: None, stroke, even_odd, region });
                 }
             }
             out
         }
-        Raw::Pattern { ops, even_odd, tile } => {
+        Raw::Pattern { ops, even_odd, tile, region } => {
             let Some(b) = ops_bbox(&ops) else { return Vec::new() };
             if inside(b, c) {
-                return vec![Raw::Pattern { ops, even_odd, tile }];
+                return vec![Raw::Pattern { ops, even_odd, tile, region }];
             }
             if disjoint(b, c) {
                 return Vec::new();
             }
             let f = clip_fill(&flatten(&ops), c);
-            if f.is_empty() { Vec::new() } else { vec![Raw::Pattern { ops: f, even_odd, tile }] }
+            if f.is_empty() { Vec::new() } else { vec![Raw::Pattern { ops: f, even_odd, tile, region }] }
         }
-        Raw::Bitmap { rect, img } => crop(rect, img, c).map(|(rect, img)| vec![Raw::Bitmap { rect, img }]).unwrap_or_default(),
-        Raw::Text(mut t) => {
+        Raw::Bitmap { rect, img, region } => crop(rect, img, c).map(|(rect, img)| vec![Raw::Bitmap { rect, img, region }]).unwrap_or_default(),
+        Raw::Text { text: mut t, region } => {
             let cur = t.clip.map_or(c, |[a, b, d, e]| intersect(c, [f64::from(a), f64::from(b), f64::from(d), f64::from(e)]));
             t.clip = Some(cur.map(|v| v as f32));
-            vec![Raw::Text(t)]
+            vec![Raw::Text { text: t, region }]
         }
     }
 }
diff --git a/crates/metafile/src/tests.rs b/crates/metafile/src/tests.rs
index 634ecd36..81993a9e 100644
--- a/crates/metafile/src/tests.rs
+++ b/crates/metafile/src/tests.rs
@@ -1733,7 +1733,7 @@ fn draw_image(id: u16, dst: [f32; 4]) -> Vec<u8> {
 fn emfplus_draw_image_places_the_bitmap() {
     let p = plus_pic(vec![prec(0x4008, 0x0500 | 4, &bitmap_2x2()), draw_image(4, [10.0, 10.0, 20.0, 40.0])]);
     match &p.items[0] {
-        Item::Bitmap { rect, width, height, rgba } => {
+        Item::Bitmap { rect, width, height, rgba, .. } => {
             assert_eq!((*width, *height), (2, 2));
             assert_eq!(rect, &[0.0, 0.0, 20.0, 40.0]);
             assert_eq!(&rgba[..8], &[255, 0, 0, 255, 0, 255, 0, 255]);

From 389c4dd5d0f9d865bd511104c45d5320f8731965 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 13:56:56 -0400
Subject: [PATCH 327/376] Fix up merged PRs: #588's polygon clip and nested
 metafiles with clip regions

Move #588's clip.rs changes into cliprect.rs, carry main's per-item clip
region through the polygon clipper, and build nested-metafile items with the
region field main added (the nested picture's own regions are not carried
over; each item takes the canvas's current clip).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/metafile/src/cliprect.rs | 20 ++++++++++----------
 crates/metafile/src/emfplus.rs  | 21 ++++++++++++++-------
 2 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/crates/metafile/src/cliprect.rs b/crates/metafile/src/cliprect.rs
index 8290dd37..396f4402 100644
--- a/crates/metafile/src/cliprect.rs
+++ b/crates/metafile/src/cliprect.rs
@@ -143,10 +143,10 @@ fn bbox_inside(b: [f64; 4], clip: &[P]) -> bool {
 pub(crate) fn clip_raw(raw: Raw, clip: &[P]) -> Vec<Raw> {
     let Some(cb) = pts_bbox(clip).filter(|_| clip.len() >= 3) else { return Vec::new() };
     match raw {
-        Raw::Path { ops, fill, stroke, even_odd } => {
+        Raw::Path { ops, fill, stroke, even_odd, region } => {
             let Some(b) = ops_bbox(&ops) else { return Vec::new() };
             if bbox_inside(b, clip) {
-                return vec![Raw::Path { ops, fill, stroke, even_odd }];
+                return vec![Raw::Path { ops, fill, stroke, even_odd, region }];
             }
             if disjoint(b, cb) {
                 return Vec::new();
@@ -156,34 +156,34 @@ pub(crate) fn clip_raw(raw: Raw, clip: &[P]) -> Vec<Raw> {
             if fill.is_some() {
                 let f = clip_fill(&subs, clip);
                 if !f.is_empty() {
-                    out.push(Raw::Path { ops: f, fill, stroke: None, even_odd });
+                    out.push(Raw::Path { ops: f, fill, stroke: None, even_odd, region: region.clone() });
                 }
             }
             if stroke.is_some() {
                 let s = clip_stroke(&subs, clip);
                 if !s.is_empty() {
-                    out.push(Raw::Path { ops: s, fill: None, stroke, even_odd });
+                    out.push(Raw::Path { ops: s, fill: None, stroke, even_odd, region });
                 }
             }
             out
         }
-        Raw::Pattern { ops, even_odd, tile } => {
+        Raw::Pattern { ops, even_odd, tile, region } => {
             let Some(b) = ops_bbox(&ops) else { return Vec::new() };
             if bbox_inside(b, clip) {
-                return vec![Raw::Pattern { ops, even_odd, tile }];
+                return vec![Raw::Pattern { ops, even_odd, tile, region }];
             }
             if disjoint(b, cb) {
                 return Vec::new();
             }
             let f = clip_fill(&flatten(&ops), clip);
-            if f.is_empty() { Vec::new() } else { vec![Raw::Pattern { ops: f, even_odd, tile }] }
+            if f.is_empty() { Vec::new() } else { vec![Raw::Pattern { ops: f, even_odd, tile, region }] }
         }
-        Raw::Bitmap { rect, img } => crop(rect, img, clip).map(|(rect, img)| vec![Raw::Bitmap { rect, img }]).unwrap_or_default(),
-        Raw::Text(mut t) => {
+        Raw::Bitmap { rect, img, region } => crop(rect, img, clip).map(|(rect, img)| vec![Raw::Bitmap { rect, img, region }]).unwrap_or_default(),
+        Raw::Text { text: mut t, region } => {
             // Text clips to a rectangle: the one around the polygon.
             let cur = t.clip.map_or(cb, |[a, b, d, e]| intersect(cb, [f64::from(a), f64::from(b), f64::from(d), f64::from(e)]));
             t.clip = Some(cur.map(|v| v as f32));
-            vec![Raw::Text(t)]
+            vec![Raw::Text { text: t, region }]
         }
     }
 }
diff --git a/crates/metafile/src/emfplus.rs b/crates/metafile/src/emfplus.rs
index a8c93775..fb757b63 100644
--- a/crates/metafile/src/emfplus.rs
+++ b/crates/metafile/src/emfplus.rs
@@ -737,15 +737,21 @@ impl Painter {
                 })
                 .collect()
         };
+        // The nested picture's own clip regions are not carried over: each item takes the
+        // canvas's current clip.
         for item in &pic.items {
             if cv.full() {
                 break;
             }
             let raw = match item {
-                Item::Path { segs, fill, stroke, even_odd } => {
-                    Raw::Path { ops: ops(segs), fill: *fill, stroke: stroke.map(|(c, w)| (c, f64::from(w) * scale)), even_odd: *even_odd }
-                }
-                Item::Pattern { segs, even_odd, tile } => Raw::Pattern {
+                Item::Path { segs, fill, stroke, even_odd, .. } => Raw::Path {
+                    ops: ops(segs),
+                    fill: *fill,
+                    stroke: stroke.map(|(c, w)| (c, f64::from(w) * scale)),
+                    even_odd: *even_odd,
+                    region: None,
+                },
+                Item::Pattern { segs, even_odd, tile, .. } => Raw::Pattern {
                     ops: ops(segs),
                     even_odd: *even_odd,
                     tile: Arc::new(RawTile {
@@ -754,12 +760,13 @@ impl Painter {
                         px: tile.rgba.clone(),
                         cell: f64::from(tile.cell[0]) * scale,
                     }),
+                    region: None,
                 },
-                Item::Bitmap { rect, width, height, rgba } => {
+                Item::Bitmap { rect, width, height, rgba, .. } => {
                     let (a, b) = (pt(rect[0], rect[1]), pt(rect[0] + rect[2], rect[1] + rect[3]));
                     let mut img = Rgba { w: *width as usize, h: *height as usize, bottom_up: false, px: rgba.clone() };
                     crate::dib::flip(&mut img, a.0 > b.0, a.1 > b.1);
-                    Raw::Bitmap { rect: [a.0.min(b.0), a.1.min(b.1), (b.0 - a.0).abs(), (b.1 - a.1).abs()], img }
+                    Raw::Bitmap { rect: [a.0.min(b.0), a.1.min(b.1), (b.0 - a.0).abs(), (b.1 - a.1).abs()], img, region: None }
                 }
                 Item::Text(t) => {
                     let mut t = t.clone();
@@ -768,7 +775,7 @@ impl Painter {
                         let (p, q) = (pt(x0, y0), pt(x1, y1));
                         t.clip = Some([p.0.min(q.0) as f32, p.1.min(q.1) as f32, p.0.max(q.0) as f32, p.1.max(q.1) as f32]);
                     }
-                    Raw::Text(t)
+                    Raw::Text { text: t, region: None }
                 }
             };
             cv.push_device(raw);

From 31e22977f75bd2f3118d81db8e79c2ed71cb5428 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:05:00 -0400
Subject: [PATCH 328/376] Fix up merged PRs: the palette test skips UI commands
 that need a value (#440 hides them)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/menus.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index 85d55396..c6f1e640 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -305,7 +305,11 @@ mod tests {
             assert_eq!(exports[0].0, "app.exportDialog");
         }
         // Open…, Save As…, Audio/Video from File… and Notes had the same duplicates: every UI command is the only entry with its label.
-        for (id, label, _, _) in crate::UI_COMMANDS {
+        // Commands that need a value (Set Zoom's percent) are left out of the palette.
+        for (id, label, _, params) in crate::UI_COMMANDS {
+            if deckcraft_engine::cmd::needs_arguments(params) {
+                continue;
+            }
             let same: Vec<_> = palette_items(&session, &label.to_lowercase()).into_iter().filter(|(_, l, _)| l == label).collect();
             assert_eq!(same.len(), 1, "{label}");
             assert_eq!(same[0].0, *id, "{label}");

From 0c3f4eee63a16f920d61d62e2de29f2fc2233afb Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:07:31 -0400
Subject: [PATCH 329/376] Fix up merged PRs: Slide Master Preserve/placeholders
 know the notes and handout master views

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/ribbon.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index 875eff5f..5c5bf74b 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -3093,7 +3093,7 @@ fn master_checks(app: &SlideApp) -> (bool, bool, bool) {
     let preserve = match st.selection.target {
         Target::Master { master } => st.doc.masters.get(master).is_some_and(|m| m.preserve),
         Target::Layout { master, layout } => st.doc.masters.get(master).and_then(|m| m.layouts.get(layout)).is_some_and(|l| l.preserve),
-        Target::Slides => false,
+        Target::Slides | Target::Handout | Target::NotesMaster => false,
     };
     let title = st.shapes().iter().any(|sh| sh.ph_type().is_some_and(|k| k.is_title()));
     let footers = st.shapes().iter().any(|sh| sh.ph_type().is_some_and(|k| k.is_footer_kind()));

From b2b378a3f0b6d7bc6d4686ac6c8546846fabd0fa Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:13:50 -0400
Subject: [PATCH 330/376] Fix up merged PRs: dedupe doc rows left by the union
 merges

One EMF / WMF parity row naming both GDI clip regions and EMF+ playback; drop
the stale Tables, Charts, chartex and SmartArt rows that came back with the
chartex PRs; one SVG-gap sentence; one charts-gap paragraph.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 docs/file-format-parity.md |  9 ++-------
 docs/gaps.md               | 22 +++++++---------------
 2 files changed, 9 insertions(+), 22 deletions(-)

diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 6a3cde7a..b99afa0e 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -50,8 +50,7 @@ PowerPoint opens and saves; Viewer = opens only).
 |---|---|---|---|
 | PNG, JPEG, GIF (animated), BMP, TIFF, WebP | yes | yes | `image` 0.25; animated GIFs play since #39 |
 | SVG | yes (with PNG fallback) | **no** | The PNG fallback shows; SVG files can't be inserted |
-| EMF / WMF | yes | partial | Drawn as vectors (paths, pens, pattern and hatch brushes, bitmaps, text in the document's fonts with the file's character advances). Rectangle clip regions (`INTERSECTCLIPRECT`, `EXCLUDECLIPRECT`, `EXTSELECTCLIPRGN`) limit later drawing; EMF+ records are not drawn. Legacy OLE objects (VML preview) and ActiveX controls show their pictures |
-| EMF / WMF | yes | partial | Drawn as vectors (paths, pens, pattern and hatch brushes, bitmaps, text in the document's fonts with the file's character advances); clip regions; EMF+ only pictures play every EMF+ drawing record (brushes incl. gradients and textures, pens, paths, curves, images, strings, transforms, clipping; see `crates/metafile/src/emfplus.rs` for the few exceptions). Legacy OLE objects (VML preview) and ActiveX controls show their pictures |
+| EMF / WMF | yes | partial | Drawn as vectors (paths, pens, pattern and hatch brushes, bitmaps, text in the document's fonts with the file's character advances). Rectangle clip regions (`INTERSECTCLIPRECT`, `EXCLUDECLIPRECT`, `EXTSELECTCLIPRGN`) limit later drawing. EMF+ only pictures play every EMF+ drawing record (brushes incl. gradients and textures, pens, paths, curves, images, strings, transforms, clipping; see `crates/metafile/src/emfplus.rs` for the few exceptions). Legacy OLE objects (VML preview) and ActiveX controls show their pictures |
 | HEIC | yes (macOS) | no | |
 | Audio: MP3, AAC/M4A, ALAC, WAV, AIFF, CAF, FLAC, Ogg Vorbis, Opus | yes (Ogg/Opus partly) | yes | Pure-Rust decoders in `crates/media`, `crates/opus` |
 | WMA | yes (Windows) | embedded, not playable | |
@@ -91,13 +90,9 @@ the round trip even though DeckCraft doesn't model it.
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | Merges and both diagonal borders round-trip |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. Trendlines (type, order or period, forecast, intercept, equation and R²) are read, written and drawn. A combo chart's secondary value axis is read and is not written back when the chart is rebuilt |
-| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
+| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept; edited and new ones written from the model with a plain-chart fallback. Treemap and sunburst hierarchy levels kept; region maps kept, drawn as tiles (no map geometry) |
 | SmartArt (`dgm`) | drawing part only, as a group; text laid out on its `dsp:txXfrm` rectangle | as shapes | Diagram data model lost on save |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save. A diagram with no relationship parts keeps its XML; the drawing and data parts are still dropped (#203) |
-| Tables with styles | yes | yes | |
-| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw` |
-| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept; edited and new ones written from the model with a plain-chart fallback. Treemap and sunburst hierarchy levels kept; region maps kept, drawn as tiles (no map geometry) |
-| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
 | Ink (`contentPart`) | yes | as a group of freeform lines | PowerPoint sees shapes, not ink |
diff --git a/docs/gaps.md b/docs/gaps.md
index ebba81af..824f7cbe 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -138,10 +138,8 @@ Detail in [file-format-parity.md](file-format-parity.md).
 ### SVG pictures don't render
 - **Evidence:** `crates/render/src/images.rs` decodes through `image` 0.25 (PNG, JPEG, WebP, GIF,
   TIFF, BMP), and EMF/WMF through `deckcraft-metafile` (ported from WordCraft: paths, fills, pens,
-  pattern and hatch brushes, bitmaps and text; rectangle clip regions are applied, EMF+ records are
-  not drawn).
-  pattern and hatch brushes, bitmaps and text; EMF+ only pictures play their EMF+ records;
-  clip regions are not drawn).
+  pattern and hatch brushes, bitmaps and text; rectangle clip regions are applied, EMF+ only
+  pictures play their EMF+ records).
   Nothing reads SVG; PowerPoint's Insert Icons stores SVG with a PNG fallback.
 - **Impact:** SVG icons show only their raster fallback, and SVG files can't be inserted.
 - **Estimate:** 4–8 h (an SVG renderer through `resvg`-style crates).
@@ -207,10 +205,6 @@ Detail in [file-format-parity.md](file-format-parity.md).
 
 ### Charts: data grid, elements and the newer chart types
 - **Evidence:** checklist rows "Edit chart data" (P0, partial), "Chart elements" (partial), "Other
-  chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
-  whisker) aren't read. Trendlines round-trip (`corpus_charts.rs`) and are not drawn. A combo
-  chart's secondary value axis is read (`y2_*`, `Series.secondary_axis`) and is not written back
-  when the chart is rebuilt.
   chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, Pareto,
   box & whisker) are read, drawn, inserted, edited and saved as `chartEx` (kept unchanged, else
   written from the model, with a plain chart fallback). Waterfalls float and total, funnels,
@@ -220,13 +214,11 @@ Detail in [file-format-parity.md](file-format-parity.md).
   (their cached geography too, also through edits) and drawn as value-coloured tiles with a
   colour scale, since DeckCraft ships no map boundaries. Radar charts are drawn polar (filled
   or lines), stock charts as high-low lines with close dashes or up/down bars and saved as
-  `c:stockChart`, and combo charts start as columns with a line. Secondary-axis writing and
-  trendlines are tracked separately.
-  whisker) aren't read. Trendlines round-trip (`corpus_charts.rs`) and are drawn: linear,
-  exponential, logarithmic, polynomial, power and moving average, with forecast and the equation
-  and R² label. A moving average is drawn with neither label. A combo chart's secondary value axis
-  is read (`y2_*`, `Series.secondary_axis`) and
-  is not written back when the chart is rebuilt.
+  `c:stockChart`, and combo charts start as columns with a line. Trendlines round-trip
+  (`corpus_charts.rs`) and are drawn: linear, exponential, logarithmic, polynomial, power and
+  moving average, with forecast and the equation and R² label. A moving average is drawn with
+  neither label. A combo chart's secondary value axis is read (`y2_*`,
+  `Series.secondary_axis`) and is not written back when the chart is rebuilt.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 

From a85024558d444b5aa9be83a7b875a5910f7ba3ed Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:16:40 -0400
Subject: [PATCH 331/376] Fix up merged PRs: Quick Access Toolbar defaults keep
 main's Export button and custom-show start

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index f9b90f38..ed040f0f 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1345,19 +1345,19 @@ mod tests {
         assert!(app.run("app.qat", json!({"add": "no.such"})).is_err());
         app.run("app.qat", json!({"remove": "edit.redo"})).unwrap();
         assert_eq!(ids(app), ["app.home", "file.save", "app.exportDialog", "edit.undo", "show.fromStart", "insert.table", "view.pane"]);
-        assert_eq!(app.ui.qat[4].label, "Table");
+        assert_eq!(app.ui.qat[5].label, "Table");
         // Saved with the rest of the UI state and read back.
         let back: UiState = serde_json::from_value(serde_json::to_value(&app.ui).unwrap()).unwrap();
         assert_eq!(back.qat, app.ui.qat);
         harness.run_steps(2);
         let app = harness.state_mut();
         app.run("app.qat", json!({"remove": "view.pane", "params": {"pane": "selection"}})).unwrap();
-        assert_eq!(app.ui.qat.len(), 5);
+        assert_eq!(app.ui.qat.len(), 6);
         app.run("app.qat", json!({"reset": true})).unwrap();
         assert_eq!(ids(app), ["app.home", "file.save", "app.exportDialog", "edit.undo", "edit.redo", "show.fromStart"]);
         // An older settings file without the toolbar gets the defaults.
         let old: UiState = serde_json::from_value(json!({"tab": "Home"})).unwrap();
-        assert_eq!(old.qat.len(), 5);
+        assert_eq!(old.qat.len(), 6);
     }
 
     #[test]

From 0609ca01cbf7a0d1828c08869f907d758f8fe8ee Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:27:15 -0400
Subject: [PATCH 332/376] Fix up merged PRs: right-click on the edited text
 box's frame selects that box

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/tools.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index 76f45079..25f71b9f 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -998,7 +998,8 @@ impl Session {
                 | Hit::Adjust { id, .. }
                 | Hit::LineEnd { id, .. }
                 | Hit::Handle { id, .. }
-                | Hit::Vertex { id, .. },
+                | Hit::Vertex { id, .. }
+                | Hit::Frame { id },
             ) => Some(*id),
             None => None,
         };

From 8ee597216dd03b049cbcfe8da75ebd17c02d7c40 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:31:01 -0400
Subject: [PATCH 333/376] Fix up landed PRs from review

- #178: ToUnicode ranges looked up without indexing
- #465: frame_num gaps are concealed (bounded) even when the SPS forbids them; cut streams keep playing
- #471: control request lines up to 256 MB so picture/media inserts still fit
- #473: a merge that loses its only row or column is removed, with regression tests
- #521: AutoCorrect no longer rewrites real words (cant, wont, im)
- #654: inherit_placeholder_geometry's doc comment back on its function

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 apps/deckcraft/src/control_server.rs |  3 ++-
 crates/engine/src/cmd/text.rs        |  3 ---
 crates/h264/src/decoder.rs           |  5 ++---
 crates/h264/src/synth_tests.rs       | 11 ++++++-----
 crates/model/src/table.rs            | 22 ++++++++++++++++++++--
 crates/pdf/src/lib.rs                |  2 +-
 crates/pptx/src/read/mod.rs          |  8 ++++----
 7 files changed, 35 insertions(+), 19 deletions(-)

diff --git a/apps/deckcraft/src/control_server.rs b/apps/deckcraft/src/control_server.rs
index 6dbf0740..966657b0 100644
--- a/apps/deckcraft/src/control_server.rs
+++ b/apps/deckcraft/src/control_server.rs
@@ -35,7 +35,8 @@ impl Default for Limits {
     fn default() -> Self {
         Self {
             max_clients: 16,
-            max_line: 16 * 1024 * 1024,
+            // Picture and media inserts carry base64 payloads: room for files of about 190 MB.
+            max_line: 256 * 1024 * 1024,
             queue: 64,
             idle_timeout: Duration::from_secs(600),
             write_timeout: Duration::from_secs(30),
diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index cce51e6d..990acf5d 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -368,8 +368,6 @@ pub const AUTOCORRECT: &[(&str, &str)] = &[
     ("dont", "don't"),
     ("doesnt", "doesn't"),
     ("didnt", "didn't"),
-    ("cant", "can't"),
-    ("wont", "won't"),
     ("isnt", "isn't"),
     ("embarass", "embarrass"),
     ("enviroment", "environment"),
@@ -379,7 +377,6 @@ pub const AUTOCORRECT: &[(&str, &str)] = &[
     ("goverment", "government"),
     ("happend", "happened"),
     ("i", "I"),
-    ("im", "I'm"),
     ("ive", "I've"),
     ("immediatly", "immediately"),
     ("independant", "independent"),
diff --git a/crates/h264/src/decoder.rs b/crates/h264/src/decoder.rs
index 1735e9ba..37ef1f29 100644
--- a/crates/h264/src/decoder.rs
+++ b/crates/h264/src/decoder.rs
@@ -476,9 +476,8 @@ impl Decoder {
         } else {
             let max = sps.max_frame_num();
             if sh.frame_num != self.prev_ref_frame_num && sh.frame_num != (self.prev_ref_frame_num + 1) % max {
-                // A gap is only legal when the SPS allows it (7.4.2.1.1); otherwise the stream is broken
-                // and filling it would only cost work, so the picture is rejected.
-                ensure!(sps.gaps_in_frame_num_allowed, "frame_num gap in a stream that does not allow gaps");
+                // A gap is only legal when the SPS allows it (7.4.2.1.1), but a cut or lossy stream has
+                // them anyway: those are concealed too rather than dropping the picture.
                 // frame_num gap (8.2.5.2): insert "non-existing" frames. Their samples are never used by
                 // conforming streams; copy the latest decoded frame for concealment.
                 let meta = Arc::new(output_meta(sps, pts, false));
diff --git a/crates/h264/src/synth_tests.rs b/crates/h264/src/synth_tests.rs
index c2286b85..ec5f601d 100644
--- a/crates/h264/src/synth_tests.rs
+++ b/crates/h264/src/synth_tests.rs
@@ -592,12 +592,13 @@ fn gap_stream(gaps: bool) -> Vec<u8> {
 }
 
 #[test]
-fn frame_num_gap_is_rejected_when_the_sps_forbids_gaps() {
+fn frame_num_gap_is_concealed_even_when_the_sps_forbids_gaps() {
+    // A cut or lossy stream: the gap is filled (bounded) instead of dropping the picture.
     let mut dec = Decoder::with_threads(1);
-    let res = dec.decode(&gap_stream(false), 0);
-    let _ = dec.flush();
-    assert!(res.is_err() || dec.take_error().is_some(), "a forbidden gap must be reported");
-    assert_eq!(dec.stats().frame_num_gaps, 0);
+    let mut out = dec.decode(&gap_stream(false), 0).unwrap();
+    out.extend(dec.flush());
+    assert_eq!(out.len(), 2);
+    assert_eq!(dec.stats().frame_num_gaps, 1);
 }
 
 #[test]
diff --git a/crates/model/src/table.rs b/crates/model/src/table.rs
index af35746e..1abd1177 100644
--- a/crates/model/src/table.rs
+++ b/crates/model/src/table.rs
@@ -321,7 +321,8 @@ impl Merge {
         } else {
             self
         };
-        (m.rs > 1 || m.gs > 1).then_some(m)
+        // A merge that lost its only row or column is gone, not a 0-span merge over its neighbours.
+        (m.rs >= 1 && m.gs >= 1 && (m.rs > 1 || m.gs > 1)).then_some(m)
     }
     fn delete_col(self, at: usize) -> Option<Self> {
         let m = if at < self.c {
@@ -331,7 +332,8 @@ impl Merge {
         } else {
             self
         };
-        (m.rs > 1 || m.gs > 1).then_some(m)
+        // A merge that lost its only row or column is gone, not a 0-span merge over its neighbours.
+        (m.rs >= 1 && m.gs >= 1 && (m.rs > 1 || m.gs > 1)).then_some(m)
     }
 }
 
@@ -552,6 +554,22 @@ mod tests {
         assert_topology(&t);
     }
 
+    #[test]
+    fn deleting_the_only_row_or_column_of_a_merge_removes_it() {
+        // A 1x3 merge across a row: deleting that row leaves no merge behind.
+        let mut t = Table::new(3, 3, 300.0, 30.0);
+        assert!(t.merge(1, 0, 1, 2));
+        assert!(t.delete_row(1));
+        assert!((0..t.n_rows()).all(|r| (0..t.n_cols()).all(|c| t.cell(r, c).is_some_and(|x| !x.is_covered() && x.grid_span <= 1))));
+        assert_topology(&t);
+        // A 3x1 merge down a column: deleting that column leaves no merge behind.
+        let mut t = Table::new(3, 3, 300.0, 30.0);
+        assert!(t.merge(0, 1, 2, 1));
+        assert!(t.delete_col(1));
+        assert!((0..t.n_rows()).all(|r| (0..t.n_cols()).all(|c| t.cell(r, c).is_some_and(|x| !x.is_covered() && x.row_span <= 1))));
+        assert_topology(&t);
+    }
+
     #[test]
     fn insert_delete_merge_split() {
         let mut t = Table::new(3, 3, 300.0, 30.0);
diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index 3f3e4fb9..5f213e09 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -467,7 +467,7 @@ impl Exporter<'_> {
                 .enumerate()
                 .map(|(gi, g)| {
                     let next = run.glyphs.get(gi + 1).map_or(g.1 + run.face.advance(g.0) * run.size / run.face.upem.max(1.0), |nx| nx.1);
-                    let range = ranges[gi].clone();
+                    let range = ranges.get(gi).cloned().unwrap_or(text.len()..text.len());
                     KrillaGlyph::new(GlyphId::new(g.0), ((next - g.1) / run.size) as f32, 0.0, ((g.2 - y0) / run.size) as f32, 0.0, range, None)
                 })
                 .collect();
diff --git a/crates/pptx/src/read/mod.rs b/crates/pptx/src/read/mod.rs
index e0a35ec1..5f0f3747 100644
--- a/crates/pptx/src/read/mod.rs
+++ b/crates/pptx/src/read/mod.rs
@@ -745,10 +745,6 @@ pub fn color_map(cm: &El) -> Vec<(String, String)> {
     cm.attrs.iter().filter(|(k, _)| !k.starts_with("xmlns")).map(|(k, v)| (k.clone(), v.clone())).collect()
 }
 
-/// Placeholders read without a geometry (an empty custom geometry, see `shapes::sp`) take the
-/// geometry of the layout or master placeholder they inherit from, as PowerPoint draws them: a
-/// layout's picture placeholder cut into a shape keeps that shape on the slide. Anything left
-/// is a rectangle.
 /// The anchor the theme's shape defaults (`a:objectDefaults/a:spDef/a:bodyPr`) give new shapes
 /// text, if any.
 fn theme_shape_anchor(t: &deckcraft_model::Theme) -> Option<deckcraft_model::text::Anchor> {
@@ -796,6 +792,10 @@ fn default_text_anchor(p: &mut Presentation) {
     }
 }
 
+/// Placeholders read without a geometry (an empty custom geometry, see `shapes::sp`) take the
+/// geometry of the layout or master placeholder they inherit from, as PowerPoint draws them: a
+/// layout's picture placeholder cut into a shape keeps that shape on the slide. Anything left
+/// is a rectangle.
 fn inherit_placeholder_geometry(p: &mut Presentation) {
     let unset = |g: &Geom| matches!(g, Geom::Custom { paths } if paths.is_empty());
     // Masters first, then layouts (from their masters), then slides (from layouts and masters).

From 2dc22843e4296af733ef792c3da9bb4821951904 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:31:11 -0400
Subject: [PATCH 334/376] Fix up merged PRs: the missing-recent test reads
 main's toast, which now carries open errors

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 6ebaeedc..fec400d0 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1939,7 +1939,7 @@ mod tests {
         // drawn message is a second node that mentions the name (the OS text after it varies).
         harness.get_by_label("missing.deckcraft").click();
         harness.run_steps(2);
-        assert!(harness.state().status.is_some(), "the open error was raised");
+        assert!(harness.state().toast.is_some(), "the open error was raised");
         assert!(
             harness.get_all_by_label_contains("missing.deckcraft").count() >= 2,
             "the open error is drawn on the page, next to the entry"

From 2a410e54fa1635733d2af8be98e0a00cd3f7fa7c Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:37:30 -0400
Subject: [PATCH 335/376] Fix up merged PRs: main's newer textures (document
 window, SmartArt previews, show grid) go through textures::upload so they
 stay within the GPU max texture side (#652)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/doc_window.rs | 2 +-
 crates/ui-egui/src/show.rs       | 2 +-
 crates/ui-egui/src/textures.rs   | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/crates/ui-egui/src/doc_window.rs b/crates/ui-egui/src/doc_window.rs
index 4445550d..dfff3d4b 100644
--- a/crates/ui-egui/src/doc_window.rs
+++ b/crates/ui-egui/src/doc_window.rs
@@ -164,7 +164,7 @@ fn ensure_texture(
         slide,
         &RenderOpts { scale: w as f64 / doc.slide_size.width.max(1.0), size: Some((w, h)), edit: true, threads: 0, ..Default::default() },
     );
-    let tex = ctx.load_texture("doc-window-slide", crate::textures::to_color_image(&img, grayscale), egui::TextureOptions::LINEAR);
+    let tex = crate::textures::upload(ctx, "doc-window-slide", crate::textures::to_color_image(&img, grayscale));
     if let Some(win) = app.doc_window.as_mut() {
         win.key = Some(key);
         win.tex = Some(tex.clone());
diff --git a/crates/ui-egui/src/show.rs b/crates/ui-egui/src/show.rs
index 6406aacb..6e6268ad 100644
--- a/crates/ui-egui/src/show.rs
+++ b/crates/ui-egui/src/show.rs
@@ -1689,7 +1689,7 @@ fn render_thumb(ctx: &egui::Context, show: &mut Show, doc: &Presentation, i: usi
         i,
         &RenderOpts { scale: w / doc.slide_size.width.max(1.0), size: Some((w as u32, h as u32)), ..Default::default() },
     );
-    let tex = ctx.load_texture(format!("show-grid-{i}"), crate::textures::to_color_image(&img, false), egui::TextureOptions::LINEAR);
+    let tex = crate::textures::upload(ctx, format!("show-grid-{i}"), crate::textures::to_color_image(&img, false));
     show.thumbs.push((i, tex.clone()));
     Some(tex)
 }
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index 629f935a..9f52918a 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -89,7 +89,7 @@ impl Textures {
         let id = g.id;
         s.shapes = vec![g];
         let img = deckcraft_render::render_shape(p, &s, id, width_px as f64 / 336.0)?;
-        let tex = ctx.load_texture(format!("smartart-{key}"), to_color_image(&img, false), TextureOptions::LINEAR);
+        let tex = upload(ctx, format!("smartart-{key}"), to_color_image(&img, false));
         if self.smartart.len() > 300 {
             self.smartart.clear();
         }

From 7acb9faad1c90516cc5e883b29a8da6c179ce67b Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:38:03 -0400
Subject: [PATCH 336/376] Fix up merged PRs: one format.tabs and one Tabs
 dialog for #567/#569 and #637
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

#569 and #637 each added a `format.tabs` command and a Tabs dialog. Keep one of each:
- format.tabs takes #567/#569's add/move/remove/clear/set plus #637's strict `set`
  (unknown alignment or non-object entries are errors, stops within 0.05 pt collapse,
  last wins) and opens the Tabs dialog when called with no fields, as #637 did.
  A defaultTab-only call no longer rewrites the stops.
- The Tabs dialog is #569's; it now seeds from the dialog's params when Paragraph (or
  format.tabs) opened it, and on OK hands the applied stops back to Paragraph.
- Tests adapted: an empty format.tabs opens the dialog; the Paragraph → Tabs test sets
  stops through #569's dialog fields.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/ruler_tests.rs         | 4 +++-
 crates/ui-egui/src/dialogs.rs                | 8 +++++++-
 crates/ui-egui/src/paragraph_dialog_tests.rs | 3 +--
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/crates/engine/src/cmd/ruler_tests.rs b/crates/engine/src/cmd/ruler_tests.rs
index 95c87c6c..e920ce93 100644
--- a/crates/engine/src/cmd/ruler_tests.rs
+++ b/crates/engine/src/cmd/ruler_tests.rs
@@ -50,7 +50,9 @@ fn tabs_add_move_remove_clear_and_undo() {
     assert_eq!(tabs(&mut s).len(), 2);
     s.execute("format.tabs", &json!({"clear": true})).unwrap();
     assert!(tabs(&mut s).is_empty());
-    assert!(s.execute("format.tabs", &json!({})).is_err());
+    s.ui_requests.clear();
+    s.execute("format.tabs", &json!({})).unwrap();
+    assert!(matches!(s.ui_requests.last(), Some(crate::UiRequest::Dialog { id, .. }) if id == "tabs"), "no fields opens the Tabs dialog");
     assert!(s.execute("format.tabs", &json!({"add": {"pos": f64::MAX}})).is_ok(), "clamped, not a crash");
     for i in 0..100 {
         s.execute("format.tabs", &json!({"add": {"pos": i as f64 * 3.0}})).unwrap();
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index fb890e1f..e570233b 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -2773,7 +2773,9 @@ const TAB_KINDS: [(&str, &str); 4] = [("l", "Left"), ("ctr", "Center"), ("r", "R
 /// list (inches, as PowerPoint's dialog) and applied together with OK.
 fn tabs_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
     if !d.fields.contains_key("stops") {
-        let r = app.session.execute("format.ruler", &json!({})).unwrap_or_default();
+        // Opened from Paragraph (or by `format.tabs` with no fields) the stops come with the
+        // dialog; otherwise they are read from the caret's paragraph.
+        let r = if d.params.get("tabs").is_some() { d.params.clone() } else { app.session.execute("format.ruler", &json!({})).unwrap_or_default() };
         let stops: Vec<String> = r["tabs"]
             .as_array()
             .map(|a| a.iter().filter_map(|t| Some(format!("{}:{}", t["pos"].as_f64()? / 72.0, t["align"].as_str().unwrap_or("l")))).collect())
@@ -2846,6 +2848,10 @@ fn tabs_dialog(app: &mut SlideApp, ui: &mut Ui, d: &mut Dialog) -> bool {
         let dt = num(d, "default", 1.0).clamp(0.02, 56.0) * 72.0;
         if let Err(e) = app.run("format.tabs", json!({"set": set, "defaultTab": dt})) {
             app.set_status(e);
+        } else if let Some(ret) = d.params.get_mut("returnParams").and_then(Value::as_object_mut) {
+            // Back in Paragraph, its Tabs… shows what was just applied.
+            ret.insert("tabs".into(), json!(set));
+            ret.insert("defaultTab".into(), json!(dt));
         }
     }
     ok || cancel
diff --git a/crates/ui-egui/src/paragraph_dialog_tests.rs b/crates/ui-egui/src/paragraph_dialog_tests.rs
index cba8fe53..fb8e796b 100644
--- a/crates/ui-egui/src/paragraph_dialog_tests.rs
+++ b/crates/ui-egui/src/paragraph_dialog_tests.rs
@@ -71,8 +71,7 @@ fn tabs_from_paragraph_applies_a_stop_and_returns() {
     assert_eq!(h.state().dialog.as_ref().map(|d| d.id.as_str()), Some("tabs"), "status {:?}", h.state().status);
     {
         let d = h.state_mut().dialog.as_mut().unwrap();
-        d.params["editing"] = json!(true);
-        d.params["edit"] = json!([{"pos": 144.0, "align": "ctr"}]);
+        d.fields.insert("stops".into(), "2:ctr".into());
     }
     h.get_by_label("OK").click_accesskit();
     // The Tabs OK frame restores Paragraph; the next frame fills its fields.

From 1659e0656511f9e14f392fbf7b8c9c74bc39bc83 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:39:10 -0400
Subject: [PATCH 337/376] Fix up merged PRs: Draw Table's table lookup uses the
 checked shape id param (#544 after #97); its test no longer writes to /tmp

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/table.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/cmd/table.rs b/crates/engine/src/cmd/table.rs
index 9ba5eed0..373c94c1 100644
--- a/crates/engine/src/cmd/table.rs
+++ b/crates/engine/src/cmd/table.rs
@@ -461,7 +461,8 @@ fn point_param(p: &Value, key: &str) -> Option<(f64, f64)> {
 /// The table under slide point `at` (frontmost), or the one named by `id`, with its origin.
 pub(crate) fn table_at(s: &Session, p: &Value, at: (f64, f64)) -> Option<(deckcraft_model::ShapeId, (f64, f64))> {
     let st = s.doc().ok()?;
-    let want = id_param(p, "id");
+    // A malformed id names no table (never the one under the pointer instead).
+    let want = id_param(p, "id", "table.draw").ok()?;
     st.shapes().iter().rev().find_map(|sh| {
         let x = sh.xfrm?;
         let ShapeKind::Table(t) = &sh.kind else { return None };

From 3b28496c36dda4f724d26c3ecc1d137ef2dda61d Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:40:09 -0400
Subject: [PATCH 338/376] Fix up merged PRs: main's newer params docs fit
 describe's grammar; help pages for bench and render-transition

file.export's slide range and transition.sound's keys parse as parameters, and the subcommands
main added since #303 have their own help page.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 apps/deckcraft-cli/src/help.rs      | 24 ++++++++++++++++++++++++
 apps/deckcraft-cli/tests/cli.rs     |  2 +-
 crates/engine/src/cmd/file.rs       |  2 +-
 crates/engine/src/cmd/transition.rs |  2 +-
 4 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/apps/deckcraft-cli/src/help.rs b/apps/deckcraft-cli/src/help.rs
index 4245172a..5803dc81 100644
--- a/apps/deckcraft-cli/src/help.rs
+++ b/apps/deckcraft-cli/src/help.rs
@@ -30,6 +30,20 @@ slide. Prints each image's path and size.
   --edit      draw what the editor shows: placeholder prompts and their dashed outlines
 
   deckcraft-cli render deck.deckcraft --slide 2 slide-3.png",
+    },
+    Subcommand {
+        name: "render-transition",
+        usage: "render-transition FILE --slide N --t T[,T...] [--width PX] OUT.png",
+        summary: "draw frames of the transition into a slide as PNG images",
+        details: "Draws the transition into slide N of FILE at each time T, from 0 (the slide before) to 1 (slide N),
+as PNG images. With one T, OUT.png is the image; with several, each frame is written next to it as
+OUT-t0.250.png and so on. Prints each image's path, size, transition and time.
+
+  --slide N    the slide the transition leads into; indices start at 0
+  --t T,T...   the times to draw, comma-separated
+  --width PX   the image width in pixels, twice the slide width in points by default
+
+  deckcraft-cli render-transition deck.deckcraft --slide 1 --t 0.25,0.5,0.75 fade.png",
     },
     Subcommand {
         name: "convert",
@@ -114,6 +128,16 @@ and prints its answer as JSON. COMMAND [PARAMS] runs a command, as run --cmd doe
         details: "Runs a Model Context Protocol server on stdin and stdout. It works on its own presentation without a
 window, or with --connect PORT (or host:port) on the DeckCraft app started with --control PORT.
 --sample opens the sample presentation.",
+    },
+    Subcommand {
+        name: "bench",
+        usage: "bench (FILE | --sample) [--runs N] [--json]",
+        summary: "time opening, drawing, saving and exporting a presentation",
+        details: "Times how long FILE, or the sample presentation with --sample, takes to open, to draw each slide, to
+save as .deckcraft and .pptx, to reopen as .pptx and to export as .pdf, and the peak memory. Prints the
+median and slowest of N runs (5 by default, 1 to 1000) as a table, or as JSON with --json.
+
+  deckcraft-cli bench deck.pptx --runs 10",
     },
     Subcommand {
         name: "links",
diff --git a/apps/deckcraft-cli/tests/cli.rs b/apps/deckcraft-cli/tests/cli.rs
index 3f1ed98b..8932c909 100644
--- a/apps/deckcraft-cli/tests/cli.rs
+++ b/apps/deckcraft-cli/tests/cli.rs
@@ -14,7 +14,7 @@ fn stderr(o: &Output) -> String {
     String::from_utf8_lossy(&o.stderr).into_owned()
 }
 
-const SUBCOMMANDS: [&str; 9] = ["info", "render", "convert", "run", "commands", "describe", "app", "mcp", "links"];
+const SUBCOMMANDS: [&str; 11] = ["info", "render", "render-transition", "convert", "run", "commands", "describe", "app", "mcp", "bench", "links"];
 
 fn words(s: &str) -> String {
     s.split_whitespace().collect::<Vec<_>>().join(" ")
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index 7f47d742..9b1030d7 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -24,7 +24,7 @@ pub fn specs() -> Vec<CommandSpec> {
         cmd!(noundo "file.saveAs", "Save As…", ["File"], Some("Cmd+Shift+S"), "{path, format?}", has_doc, save_as),
         cmd!(noundo "file.saveTemplate", "Save as Template…", ["File"], None, "{path}", has_doc, save_as),
         cmd!(query "file.saveBytes", "Save to Data", [], None, "{format?: deckcraft|pptx} → {data: base64}", has_doc, save_bytes_cmd),
-        cmd!(noundo "file.export", "Export…", ["File"], None, "{path, format?: png|jpeg|pptx|deckcraft|outline|pdf (else by path), slide?: index, all?: bool, scale?: px per pt, layout?: slides|notes|handouts (pdf), perPage?: 1|2|3|4|6|9, paper?: letter|a4|legal|a3 (pdf), orientation?: portrait|landscape (pdf), dpi?, slides?: [index]|\"1-3,5\", includeHidden?, textLayer?, frame?}", has_doc, export),
+        cmd!(noundo "file.export", "Export…", ["File"], None, "{path, format?: png|jpeg|pptx|deckcraft|outline|pdf (else by path), slide?: index, all?: bool, scale?: px per pt, layout?: slides|notes|handouts (pdf), perPage?: 1|2|3|4|6|9, paper?: letter|a4|legal|a3 (pdf), orientation?: portrait|landscape (pdf), dpi?, slides?: [index]|range (\"1-3,5\"), includeHidden?, textLayer?, frame?}", has_doc, export),
         cmd!(
             query "file.info",
             "Info",
diff --git a/crates/engine/src/cmd/transition.rs b/crates/engine/src/cmd/transition.rs
index 4c798125..4047faf2 100644
--- a/crates/engine/src/cmd/transition.rs
+++ b/crates/engine/src/cmd/transition.rs
@@ -35,7 +35,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Sound",
             ["Transitions", "Timing"],
             None,
-            "{builtin?: chime|click|camera|whoosh|drumRoll|laser | path? | data: base64, name?; none?: true (No Sound); stopPrevious?: true; loop?: bool (Loop Until Next Sound); index?} — the sound plays as the slide comes in",
+            "{builtin?: chime|click|camera|whoosh|drumRoll|laser | path? | data: base64, name?, none?: true (No Sound), stopPrevious?: true, loop?: bool (Loop Until Next Sound), index?} — the sound plays as the slide comes in",
             has_slide,
             sound
         ),

From 7dcfe0f989ffe4fb573162a39a349e07f1887069 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:40:18 -0400
Subject: [PATCH 339/376] Fix up merged PRs: a textless shape still copies as
 the objects marker so Ctrl+V pastes it (#182), not as a picture (#702)

With only an image on the system clipboard egui-winit drops Ctrl+V, so #702's
picture copy of a textless shape undid main's #182 fix. Text keeps #702's HTML,
and empty plain text falls back to the marker.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 ROADMAP.md                |  2 +-
 crates/ui-egui/src/lib.rs | 58 ++++++++-------------------------------
 docs/ui-parity.md         |  4 +--
 3 files changed, 15 insertions(+), 49 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 3883b475..ce2d2b7f 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -210,7 +210,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-14 | Design ▸ Effects: named effect schemes (DeckCraft, Soft, Crisp, Lift, Glow, Plain) replace the theme's fills, lines and effects and leave colours and fonts. `design.effects` |
 | 2026-10-14 | Slide Master: Preserve on the open master or layout, and Title and Footers placeholder checkboxes. Two commands (`master.preserve`, `master.placeholders`); dialogs stay 27; breadth stays 79% |
 | 2026-10-14 | Trim Media: start, end and fades open from the selected clip, so OK no longer resets them to zero |
-| 2026-10-14 | Copy and paste with other apps: bold, italic and underline travel as HTML (Pages keeps them), and a shape with no text copies out as a picture |
+| 2026-10-14 | Copy and paste with other apps: bold, italic and underline travel as HTML (Pages keeps them); a shape with no text still copies as DeckCraft objects so Ctrl+V pastes it (#182) |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index e0ad85c8..d5f3e36f 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1120,59 +1120,24 @@ impl SlideApp {
 
     /// Offer the copy or cut on the system clipboard.
     ///
-    /// Slides go out as plain text. A textless shape goes out as a picture (Keynote and Pages
-    /// paste that). Text goes out as HTML plus the same plain words, so a paste back into
-    /// DeckCraft still uses the internal clipboard.
+    /// Slides go out as plain text. Text goes out as HTML plus the same plain words, so a paste
+    /// back into DeckCraft still uses the internal clipboard. A textless shape leaves the
+    /// invisible [`OBJECTS_MARKER`] rather than a picture: with only an image on the clipboard
+    /// egui-winit drops Ctrl+V, and the shortcut could no longer paste the shape here (#182).
     fn publish_clipboard(&mut self, ctx: &egui::Context, cut: bool) {
-        // Cut deletes the shapes, so the picture is taken first.
-        let picture = self.textless_selection_image();
         let cmd = if cut { "edit.cut" } else { "edit.copy" };
         let Ok(v) = self.session.execute(cmd, &json!({})) else { return };
         let text = v.get("text").and_then(Value::as_str).unwrap_or("").to_string();
         let html = v.get("html").and_then(Value::as_str).unwrap_or("").to_string();
-        if !self.session.clipboard.slides.is_empty() {
-            ctx.copy_text(system_clipboard_text(&text));
-            return;
-        }
-        if let Some(img) = picture {
-            ctx.copy_image(img);
-            return;
-        }
-        if !html.is_empty() && self.services.clipboard_set_html.as_mut().is_some_and(|f| f(&html, &text)) {
+        if self.session.clipboard.slides.is_empty()
+            && !html.is_empty()
+            && self.services.clipboard_set_html.as_mut().is_some_and(|f| f(&html, &text))
+        {
             return;
         }
         ctx.copy_text(system_clipboard_text(&text));
     }
 
-    /// A picture of the selected shapes when none of them has text, on the slide (not a master).
-    fn textless_selection_image(&self) -> Option<egui::ColorImage> {
-        let st = self.session.active()?;
-        if st.selection.target != deckcraft_engine::Target::Slides || st.selection.text.is_some() || st.selection.shapes.is_empty() {
-            return None;
-        }
-        let mut plain = String::new();
-        let mut any = false;
-        for id in &st.selection.shapes {
-            let Some(sh) = st.shape(*id) else { continue };
-            any = true;
-            if let Some(t) = &sh.text {
-                if !plain.is_empty() {
-                    plain.push('\n');
-                }
-                plain.push_str(&t.text());
-            }
-        }
-        if !any || !plain.is_empty() {
-            return None;
-        }
-        let slide = st.current_slide()?;
-        let img = deckcraft_render::render_shapes(&st.doc, slide, &st.selection.shapes, 2.0)?;
-        if img.width == 0 || img.height == 0 {
-            return None;
-        }
-        Some(textures::to_color_image(&img, false))
-    }
-
     /// Lay out the whole window.
     pub fn ui(&mut self, ui: &mut egui::Ui) {
         let ctx = ui.ctx().clone();
@@ -1943,14 +1908,15 @@ mod tests {
         assert_eq!(body.paragraphs[0].runs[0].props.bold, Some(true), "{body:?}");
     }
 
-    /// A shape with no text copies out as a picture.
+    /// A shape with no text copies out as the objects marker (not a picture), so Ctrl+V can
+    /// still paste it here (#182).
     #[test]
-    fn a_textless_shape_copies_as_a_picture() {
+    fn a_textless_shape_copies_as_the_objects_marker() {
         let mut h = step_app(Services::default());
         h.state_mut().session.execute("shape.insert", &json!({"preset": "rect", "rect": [80.0, 80.0, 120.0, 80.0]})).unwrap();
         h.event(egui::Event::Copy);
         h.run_steps(1);
         let cmds = &h.output().platform_output.commands;
-        assert!(cmds.iter().any(|c| matches!(c, egui::output::OutputCommand::CopyImage(img) if img.size[0] > 0 && img.size[1] > 0)), "{cmds:?}");
+        assert!(cmds.iter().any(|c| matches!(c, egui::output::OutputCommand::CopyText(t) if t == OBJECTS_MARKER)), "{cmds:?}");
     }
 }
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index e72bc696..768512f2 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -133,7 +133,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Drag and drop of files and between thumbnails | yes | yes |
 | Slide Sorter sections: a bar per section, add, rename in place, collapse, drag the whole section (its slides move with it) | yes | yes |
 | Image paste from the clipboard | yes | macOS yes; Windows and Linux no (#53) |
-| Image paste from the clipboard | yes | macOS pastes a picture when the paste carries no text (TIFF), a textless shape copies out as a picture, and rich text copies and pastes as HTML (bold, italic, underline). Windows and Linux image paste stays #53 |
+| Image paste from the clipboard | yes | macOS pastes a picture when the paste carries no text (TIFF), and rich text copies and pastes as HTML (bold, italic, underline). Windows and Linux image paste stays #53 |
 | Font menu: every installed family with its faces | yes | families yes; only Regular/Bold/Italic faces (#69) |
 
 ## Keyboard shortcuts
@@ -223,7 +223,7 @@ on the slide as shapes. No pixel comparison against PowerPoint screenshots has b
 | 2026-10-14 | minor | Design ▸ Effects applies a named effect scheme (fills, lines and effects). Not a new dialog; dialogs stay 27 |
 | 2026-10-14 | minor | Slide Master: Preserve, and Title and Footers placeholders, on the open master or layout |
 | 2026-10-14 | trivial | Trim Media dialog: start, end and fades follow the selected clip |
-| 2026-10-14 | minor | Copy and paste rich text (HTML: bold, italic, underline) and a picture of a textless shape with other apps |
+| 2026-10-14 | minor | Copy and paste rich text (HTML: bold, italic, underline) with other apps |
 | 2026-10-12 | minor | File tab (Backstage) observed in PowerPoint for Windows and matched (#76); the start screen is File › Home |
 | 2026-10-12 | minor | Off-slide objects drawn and editable around the slide in Normal view (#270) |
 | 2026-10-12 | minor | Selection Pane matched to PowerPoint (#133): drag and drop, arrows, groups, eye, Lock |

From 2173cf9569c44bb6296f618fc93c1725997c44d9 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:40:38 -0400
Subject: [PATCH 340/376] Fix up merged PRs: Draw Table and Table Eraser sit in
 the Table Design tab

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/ribbon.rs | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index d5c4501b..d2c87aea 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -2816,6 +2816,18 @@ fn table_design(app: &mut SlideApp, ui: &mut Ui) {
             });
         });
     });
+    // Draw Borders: the pencil splits cells along a line, the eraser merges across a border.
+    group(ui, |ui| {
+        use deckcraft_engine::ToolKind;
+        use deckcraft_engine::tools::{DRAW_TABLE, TABLE_ERASER};
+        let cur = app.session.tool.kind.clone();
+        for (icon, label, preset) in [(Icon::Pencil, "Draw Table", DRAW_TABLE), (Icon::Eraser, "Table Eraser", TABLE_ERASER)] {
+            let on = matches!(&cur, ToolKind::Shape { preset: p } if p == preset);
+            if big_button_ex(ui, icon, label, true, false, on).0.clicked() {
+                app.session.set_tool(if on { ToolKind::Select } else { ToolKind::Shape { preset: preset.into() } });
+            }
+        }
+    });
 }
 
 /// A Picture Styles gallery tile: a landscape "picture" in the style's shape and frame.
@@ -2887,18 +2899,6 @@ fn paint_recolor(p: &egui::Painter, r: Rect, id: &str, sc: &deckcraft_color::Col
         p.rect_filled(Rect::from_min_size(pos2(r.left() + k as f32 * w, r.top()), vec2(w + 0.5, r.height())), CornerRadius::ZERO, c);
     }
     p.rect_stroke(r, CornerRadius::ZERO, Stroke::new(0.5, Color32::from_gray(160)), egui::StrokeKind::Outside);
-    // Draw Borders: the pencil splits cells along a line, the eraser merges across a border.
-    group(ui, |ui| {
-        use deckcraft_engine::ToolKind;
-        use deckcraft_engine::tools::{DRAW_TABLE, TABLE_ERASER};
-        let cur = app.session.tool.kind.clone();
-        for (icon, label, preset) in [(Icon::Pencil, "Draw Table", DRAW_TABLE), (Icon::Eraser, "Table Eraser", TABLE_ERASER)] {
-            let on = matches!(&cur, ToolKind::Shape { preset: p } if p == preset);
-            if big_button_ex(ui, icon, label, true, false, on).0.clicked() {
-                app.session.set_tool(if on { ToolKind::Select } else { ToolKind::Shape { preset: preset.into() } });
-            }
-        }
-    });
 }
 
 pub fn paint_table_style(p: &egui::Painter, r: Rect, id: &str, sc: &deckcraft_color::ColorScheme) {

From 367b079d64f6fdd7cc4063711ddbd70b5fbc6724 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:42:15 -0400
Subject: [PATCH 341/376] Fix up #609: spelling language tags can't leave the
 dictionary folders; long words get no suggestions

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/lib.rs   |  2 +-
 crates/engine/src/spell.rs | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index 8bfbcbe4..7e367974 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -18,8 +18,8 @@ pub mod links;
 pub mod recovery;
 pub mod sample;
 pub mod sounds;
-pub mod templates;
 pub mod spell;
+pub mod templates;
 pub mod tools;
 
 use std::sync::Arc;
diff --git a/crates/engine/src/spell.rs b/crates/engine/src/spell.rs
index 4c089812..a903f7ee 100644
--- a/crates/engine/src/spell.rs
+++ b/crates/engine/src/spell.rs
@@ -320,6 +320,10 @@ impl Dictionary {
 
     /// Up to `n` corrections for a misspelt `word`, best first.
     pub fn suggest(&self, word: &str, n: usize) -> Vec<String> {
+        // Edit-distance candidates grow with the word: nothing is suggested for a run-on token.
+        if word.chars().count() > MAX_SUGGEST_CHARS {
+            return vec![];
+        }
         let cap = word.chars().next().is_some_and(char::is_uppercase);
         let lower = if cap && word.chars().skip(1).all(|c| !c.is_uppercase()) { word.to_lowercase() } else { word.to_string() };
         let w: Vec<char> = lower.chars().collect();
@@ -438,8 +442,17 @@ fn names(lang: &str) -> (String, String) {
     (full, base)
 }
 
+/// A language tag as dictionaries are named: 1–16 ASCII letters, digits, `-` or `_`.
+fn valid_lang(lang: &str) -> bool {
+    (1..=16).contains(&lang.len()) && lang.bytes().all(|b| b.is_ascii_alphanumeric() || b == b'-' || b == b'_')
+}
+
 /// The `.aff`/`.dic` pair for `lang` in `dirs`: the exact locale first, then any of its language.
 pub fn find_in(dirs: &[PathBuf], lang: &str) -> Option<(PathBuf, PathBuf)> {
+    // A language tag names a file in the dictionary folders and nothing else: no `..`, no separators.
+    if !valid_lang(lang) {
+        return None;
+    }
     let (full, base) = names(lang);
     let pair = |d: &Path, stem: &str| {
         let (a, b) = (d.join(format!("{stem}.aff")), d.join(format!("{stem}.dic")));
@@ -468,6 +481,9 @@ pub fn find_in(dirs: &[PathBuf], lang: &str) -> Option<(PathBuf, PathBuf)> {
     None
 }
 
+/// Longest word `Dictionary::suggest` generates corrections for.
+const MAX_SUGGEST_CHARS: usize = 64;
+
 type Cache = Mutex<HashMap<String, Option<Arc<Dictionary>>>>;
 
 fn cache() -> &'static Cache {
@@ -529,6 +545,19 @@ SFX D Y 1\nSFX D 0 ed/S .\n";
         }
     }
 
+    #[test]
+    fn a_language_tag_cannot_leave_the_dictionary_folders() {
+        let dir = std::env::temp_dir().join(format!("deckcraft-dict-lang-{}", std::process::id()));
+        let inner = dir.join("dicts");
+        std::fs::create_dir_all(&inner).unwrap();
+        std::fs::write(dir.join("evil.aff"), "SET UTF-8\n").unwrap();
+        std::fs::write(dir.join("evil.dic"), "1\nword\n").unwrap();
+        assert!(find_in(std::slice::from_ref(&inner), "../evil").is_none());
+        assert!(find_in(std::slice::from_ref(&inner), "en/../../evil").is_none());
+        assert!(!valid_lang("") && !valid_lang("a".repeat(17).as_str()) && valid_lang("en-US") && valid_lang("pt_BR"));
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+
     #[test]
     fn suggestions_come_from_edits_and_replacements() {
         let d = d();

From 740a57ddbabad8da84a1ad4d709274a80fb4ea65 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:43:36 -0400
Subject: [PATCH 342/376] Fix up merged PRs: table borders under a right-click
 select the table; the cell caret is drawn once

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/tools.rs   |  4 +++-
 crates/ui-egui/src/canvas.rs | 11 -----------
 2 files changed, 3 insertions(+), 12 deletions(-)

diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index 97a4cfb4..9c0dcabc 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -1025,7 +1025,9 @@ impl Session {
                 | Hit::LineEnd { id, .. }
                 | Hit::Handle { id, .. }
                 | Hit::Vertex { id, .. }
-                | Hit::Frame { id },
+                | Hit::Frame { id }
+                | Hit::TableColumn { id, .. }
+                | Hit::TableRow { id, .. },
             ) => Some(*id),
             None => None,
         };
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 3c504f3d..33553a83 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -612,17 +612,6 @@ fn overlays(app: &mut SlideApp, ui: &Ui, painter: &egui::Painter, xf: Xf, t: &To
         let pts = [Point::new(cr.x0, cr.y0), Point::new(cr.x1, cr.y0), Point::new(cr.x1, cr.y1), Point::new(cr.x0, cr.y1)]
             .map(|q| xf.to_screen(f.affine * q));
         poly(painter, pts, Stroke::new(2.0, t.accent));
-        // The composition is in the cell text; underline it where that text is drawn (#101).
-        for (a, b, thick) in deckcraft_engine::cmd::text::composition_underlines(st) {
-            painter.line_segment([xf.to_screen(a), xf.to_screen(b)], Stroke::new(if thick { 2.0 } else { 1.0 }, t.caret));
-        }
-        if !ts.is_range() {
-            let blink = (ui.input(|i| i.time) * 1.6).fract() < 0.6;
-            ui.ctx().request_repaint_after(std::time::Duration::from_millis(300));
-            if blink && let Some((top, bot)) = deckcraft_engine::cmd::text::caret_line(st, ts) {
-                painter.line_segment([xf.to_screen(top), xf.to_screen(bot)], Stroke::new(1.5, t.caret));
-            }
-        }
     }
     // Smart guides, marquee, previews.
     for g in &app.session.tool.guides {

From 8d68b2fe9d25c0b60ce60485a5dc3cc7cc795a00 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B0=D0=B3=D0=B4=D0=B0=20=D0=9C=2E=D0=93=2E?=
 <mail@mgmagda.ru>
Date: Wed, 14 Oct 2026 20:35:43 +0200
Subject: [PATCH 343/376] Render: an unfilled shape's glow follows its line

A glow always filled the shape's whole silhouette, so a frame with no fill
(a rounded-rectangle border with a soft glow, common in corporate decks)
came out as a solid tinted panel over the slide. PowerPoint glows such a
shape along its outline only and leaves the inside clear; a filled shape's
or a picture's glow is unchanged. The line glow uses the same width and
blur as the outline part of a filled shape's glow.

Checked against PowerPoint's own PDF export of 31 real decks (597
slides): 66 slides closer to PowerPoint, none further; the frames' slides
go from a mean pixel difference of ~29 to ~2.5-8 (of 255), and the 90th
percentile over all slides from 12.9 to 10.0.
---
 crates/render/src/lib.rs   |  6 +++++-
 crates/render/src/tests.rs | 28 ++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index df7e43c2..89bb07ef 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -1388,7 +1388,11 @@ impl Renderer {
             ctx.set_paint(color(c.with_alpha(255), 1.0));
             ctx.set_stroke(kurbo::Stroke::new(g.radius.max(0.0) * 0.95).with_join(kurbo::Join::Round));
             ctx.stroke_path(&silhouette);
-            ctx.fill_path(&silhouette);
+            // A shape without a fill (an outline, a frame) glows along its line only: the inside
+            // stays clear, as PowerPoint draws it.
+            if content.is_some() || fill_alpha.is_some() {
+                ctx.fill_path(&silhouette);
+            }
             ctx.pop_layer();
         }
         if let Some(rf) = &e.reflection {
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index d7aec2a6..e5f8d450 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -344,6 +344,34 @@ fn horizontal_bars_list_the_first_category_at_the_bottom_unless_reversed() {
     assert!(draw(true) < 180, "reversed: first category at the top: {}", draw(true));
 }
 
+#[test]
+fn glow_of_an_unfilled_shape_follows_its_line() {
+    // A frame (no fill, thin line) with a strong glow: the glow lines its edge, the inside stays
+    // the slide's white, as PowerPoint draws it.
+    let glow = |fill: Option<Fill>| {
+        let mut sh = Shape {
+            id: ShapeId(610),
+            xfrm: Some(Xfrm::new(100.0, 100.0, 400.0, 300.0)),
+            fill,
+            line: Some(deckcraft_model::style::Line::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(0, 176, 240)), 0.25)),
+            ..Default::default()
+        };
+        sh.effects = Some(deckcraft_model::Effects {
+            glow: Some(deckcraft_model::style::Glow { color: ColorRef::rgb(deckcraft_color::Rgba::rgb(0, 0, 255)), radius: 8.0 }),
+            ..Default::default()
+        });
+        render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() })
+    };
+    let img = glow(Some(Fill::None));
+    let inside = img.pixel(300, 250);
+    assert!(inside[0] > 245 && inside[1] > 245, "{inside:?}");
+    let edge = img.pixel(300, 97);
+    assert!(edge[0] < 230, "{edge:?}");
+    // A filled shape's glow is still the whole silhouette's (the fill covers its inside).
+    let img = glow(Some(Fill::solid(ColorRef::rgb(deckcraft_color::Rgba::rgb(255, 255, 255)))));
+    assert!(img.pixel(300, 94)[0] < 240);
+}
+
 #[test]
 fn placeholder_prompts_only_in_edit_view() {
     let p = Presentation::default();

From 526e31d1f7d6c582805b7237cd52c928f7afa051 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:44:40 -0400
Subject: [PATCH 344/376] Fix up merged PRs: a picked file remembers main's
 Handout and Notes Master views (#479)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 9a19f7c7..dfc6a443 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -96,6 +96,8 @@ enum FilePlace {
         master: MasterId,
         layout: LayoutId,
     },
+    /// The handout or notes master (one per presentation, so no id is needed).
+    NotesPage(Target),
     /// The document was open but had no current slide, master or layout.
     Unspecified,
 }
@@ -1169,6 +1171,7 @@ impl SlideApp {
                 },
                 None => FilePlace::Unspecified,
             },
+            t @ (Target::Handout | Target::NotesMaster) => FilePlace::NotesPage(t),
         };
         FileTarget::Document { doc: d.uid, place }
     }
@@ -1189,6 +1192,7 @@ impl SlideApp {
                 matches!(d.selection.target, Target::Layout { master: mi, layout: li }
                     if d.doc.masters.get(mi).is_some_and(|m| m.id == *master && m.layouts.get(li).is_some_and(|l| l.id == *layout)))
             }
+            FilePlace::NotesPage(t) => d.selection.target == *t,
             FilePlace::Unspecified => false,
         }
     }
@@ -1293,6 +1297,7 @@ impl SlideApp {
                     .ok_or_else(|| "the layout it was chosen for was deleted".to_string())?;
                 Ok(LocatedPlace { target: Target::Layout { master: mi, layout: li }, slide: None })
             }
+            FilePlace::NotesPage(t) => Ok(LocatedPlace { target: *t, slide: None }),
             FilePlace::Unspecified => Err("there was no slide to put it on".into()),
         }
     }

From e90e26545388df50393872fec36db652a2c76ee0 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:45:12 -0400
Subject: [PATCH 345/376] Fix up merged PRs: Grid Options guides follow #559,
 and its dialog test finds its own Spacing
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Turning guides on in Grid Options (#536) now adds the two centre guides to a presentation
  without any, as View › Guides does since #559 stopped drawing fixed centre lines.
- The Grid Options dialog test looked for any "Spacing" label; main's ribbon has Line Spacing
  too, so it looks for "Spacing (pt)".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index f8f188b1..d27f163c 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -588,6 +588,10 @@ impl SlideApp {
                     }
                     if let Some(b) = guides {
                         self.ui.guides = b;
+                        // As View › Guides: a presentation without guides gets the two centre guides.
+                        if b && self.session.active().is_some_and(|d| d.doc.guides.is_empty()) {
+                            let _ = self.session.execute("guide.add", &json!({"defaults": true}));
+                        }
                     }
                 } else {
                     self.dialog = Some(dialogs::Dialog::new("gridOptions"));
@@ -1690,7 +1694,7 @@ mod tests {
         harness.run_steps(2);
         assert!(harness.query_by_label_contains("Display grid on screen").is_some());
         assert!(harness.query_by_label_contains("Snap objects to grid").is_some());
-        assert!(harness.query_by_label_contains("Spacing").is_some());
+        assert!(harness.query_by_label_contains("Spacing (pt)").is_some());
         let show_grid = harness
             .query_all_by_role_and_label(egui::accesskit::Role::CheckBox, "Display grid on screen")
             .next()

From 748b83a28442e45aa59875f0774f85821e5fb6b9 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:46:09 -0400
Subject: [PATCH 346/376] Fix up merged PRs: one re-export of the table cell
 helpers (#618 and #626 both added it)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/render/src/lib.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/crates/render/src/lib.rs b/crates/render/src/lib.rs
index 1eacf0d7..df7e43c2 100644
--- a/crates/render/src/lib.rs
+++ b/crates/render/src/lib.rs
@@ -57,7 +57,6 @@ pub use placed::{Placed, PlacedLink, PlacedShape, PlacedText, place_master_texts
 pub use table::cell_body as table_cell_body;
 pub use table::cell_rects as table_cell_rects;
 pub use table::row_heights as table_row_heights;
-pub use table::{cell_body as table_cell_body, cell_rects as table_cell_rects};
 pub use transition::{SlideParts, composite_transition, render_transition};
 
 /// Largest pixmap side we render (vello_cpu uses u16 sizes).

From 560928af94e9149cbc44d4e46355cf42421a8672 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:46:41 -0400
Subject: [PATCH 347/376] Fix up merged PRs: cargo fmt

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index dfc6a443..e5b5b884 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -19,8 +19,8 @@ pub mod icons;
 pub mod media;
 pub mod menus;
 pub mod panes;
-pub mod qat;
 mod preview;
+pub mod qat;
 pub mod ribbon;
 pub mod selpane;
 pub mod settings;
@@ -1524,9 +1524,7 @@ impl SlideApp {
         let Ok(v) = self.session.execute(cmd, &json!({})) else { return };
         let text = v.get("text").and_then(Value::as_str).unwrap_or("").to_string();
         let html = v.get("html").and_then(Value::as_str).unwrap_or("").to_string();
-        if self.session.clipboard.slides.is_empty()
-            && !html.is_empty()
-            && self.services.clipboard_set_html.as_mut().is_some_and(|f| f(&html, &text))
+        if self.session.clipboard.slides.is_empty() && !html.is_empty() && self.services.clipboard_set_html.as_mut().is_some_and(|f| f(&html, &text))
         {
             return;
         }

From e6862f18ae91969a98a0305e272e0971c1d707e8 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:49:10 -0400
Subject: [PATCH 348/376] Fix up merged PRs: WordArt warp handles on main's
 warp catalog and hover hit list

- #519's handle test iterated the old `ALL` preset list; main has `CATALOG` now.
- The hover hit-test match lists every Hit variant; add #519's Hit::Warp.
- Drop the duplicate "tabs" dialog title that #569 and #637 both added.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/tools.rs    | 3 ++-
 crates/geom/src/warp/tests.rs | 2 +-
 crates/ui-egui/src/dialogs.rs | 1 -
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index 418c1de4..7dbf9038 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -1104,7 +1104,8 @@ impl Session {
                 | Hit::Adjust { id, .. }
                 | Hit::LineEnd { id, .. }
                 | Hit::Handle { id, .. }
-                | Hit::Vertex { id, .. },
+                | Hit::Vertex { id, .. }
+                | Hit::Warp { id, .. },
             ) => Some(*id),
             None => None,
         };
diff --git a/crates/geom/src/warp/tests.rs b/crates/geom/src/warp/tests.rs
index ac231cf0..c04ddd10 100644
--- a/crates/geom/src/warp/tests.rs
+++ b/crates/geom/src/warp/tests.rs
@@ -281,7 +281,7 @@ fn hostile_adjusts_and_boxes_stay_finite() {
 #[test]
 fn every_preset_has_one_handle_per_adjust() {
     let r = rect();
-    for name in ALL {
+    for name in CATALOG.iter().map(|p| p.id) {
         let hs = handles(name, &[], r);
         assert_eq!(hs.len(), adjust_count(name), "{name}");
         let defaults = adjust_defaults(name);
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index e3b23245..c3010053 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -47,7 +47,6 @@ fn title(id: &str) -> &'static str {
         "paragraph" => "Paragraph",
         "tabs" => "Tabs",
         "font" => "Font",
-        "tabs" => "Tabs",
         "about" => "About DeckCraft",
         "preferences" => "Preferences",
         "gridOptions" => "Grid Options",

From 69e212e3afef295f83972533e53739d21e72562b Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:50:49 -0400
Subject: [PATCH 349/376] Fix up merged PRs: the IME notes test reads the
 formatted draft's text; drop an unused import

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/ime_tests.rs | 4 ++--
 crates/ui-egui/src/sorter.rs    | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/crates/ui-egui/src/ime_tests.rs b/crates/ui-egui/src/ime_tests.rs
index 911a2d1a..c9bc7dab 100644
--- a/crates/ui-egui/src/ime_tests.rs
+++ b/crates/ui-egui/src/ime_tests.rs
@@ -132,14 +132,14 @@ fn korean_composes_in_the_notes_pane() {
     for pre in ["ㄴ", "노", "놑", "노트"] {
         h.event(preedit(pre));
         h.run_steps(1);
-        assert_eq!(h.state().notes_buf.2, pre, "the preedit replaces the last one");
+        assert_eq!(h.state().notes_buf.2.text, pre, "the preedit replaces the last one");
     }
     let ime = h.output().platform_output.ime.expect("the notes field turns the input method on");
     let slide = h.state().slide_rect.unwrap();
     assert!(ime.cursor_rect.min.y > slide.max.y, "candidate window at the notes caret, under the slide");
     h.event(Event::Ime(ImeEvent::Commit("노트".into())));
     h.run_steps(1);
-    assert_eq!(h.state().notes_buf.2, "노트");
+    assert_eq!(h.state().notes_buf.2.text, "노트");
     // Focus leaves the field (Escape): the notes are committed as one step.
     h.key_press(egui::Key::Escape);
     h.run_steps(2);
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index 03afb638..e33842a0 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -8,7 +8,7 @@ use serde_json::json;
 
 use crate::icons::{self, Icon};
 use crate::theme::{self, Tokens};
-use crate::{SlideApp, widgets};
+use crate::SlideApp;
 
 /// Sorter-only state. Nothing here is part of the document.
 #[derive(Debug, Default)]

From ed13dd6158fb403f943fe65770ff96ed0ab3f322 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:54:35 -0400
Subject: [PATCH 350/376] Fix up merged PRs: GIF export goes through main's
 export path

The Export dialog's GIF choice runs through SlideApp::export_as (desktop and web download),
.gif is a writable output extension for convert/run, and the CLI help pages describe GIF output
and --export-params. A file.export `slides` range string ("1-3,5") works for GIF as for PDF.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 apps/deckcraft-cli/src/help.rs      | 11 +++++++----
 apps/deckcraft-cli/tests/convert.rs |  2 +-
 crates/engine/src/tests.rs          |  3 ++-
 crates/ui-egui/src/lib.rs           |  2 ++
 4 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/apps/deckcraft-cli/src/help.rs b/apps/deckcraft-cli/src/help.rs
index 5803dc81..d6158f46 100644
--- a/apps/deckcraft-cli/src/help.rs
+++ b/apps/deckcraft-cli/src/help.rs
@@ -50,19 +50,22 @@ OUT-t0.250.png and so on. Prints each image's path, size, transition and time.
         usage: "convert IN OUT",
         summary: "save a presentation in the format OUT's extension names",
         details: "Opens IN (.deckcraft or .pptx) and writes it to OUT, in the format OUT's extension names:
-.deckcraft, .pptx, .pdf, .txt or .md for the outline, .png or .jpg for the first slide. Any other
-extension is written as .deckcraft. Prints OUT.
+.deckcraft, .pptx, .pdf, .txt or .md for the outline, .png or .jpg for the first slide, .gif for an
+animated GIF with one frame per slide. Other extensions are refused. Prints OUT.
 
   deckcraft-cli convert deck.deckcraft deck.pptx",
     },
     Subcommand {
         name: "run",
-        usage: "run [--in FILE | --sample] [--cmd COMMAND[=PARAMS]]... [--save OUT] [--export OUT] [--print]",
+        usage: "run [--in FILE | --sample] [--cmd COMMAND[=PARAMS]]... [--save OUT] [--export OUT [--export-params JSON]] [--print]",
         summary: "run commands on a presentation, then save or export it",
         details: "Runs commands, in order, on one presentation: FILE with --in, the sample presentation with --sample,
 else a new one with an empty title slide. Then --save writes the presentation: .deckcraft keeps
 everything; .pptx, .pdf and .md (the outline) are written as convert writes them. --export writes the
-current slide as .png or .jpg, or the presentation as .pdf or .pptx.
+current slide as .png or .jpg, or the presentation as .pdf, .pptx or an animated .gif (one frame per
+slide). --export-params passes file.export options as one JSON object, such as
+'{\"width\": \"large\", \"secondsPerSlide\": 3, \"loop\": false, \"slides\": [0, 1, 2]}' for a GIF
+(`deckcraft-cli describe file.export` lists them).
 
 Each --cmd is one command: COMMAND is a command id, then `=`, then the command's parameters as one
 JSON object. Quote it for the shell. A command that needs no parameters is just its id.
diff --git a/apps/deckcraft-cli/tests/convert.rs b/apps/deckcraft-cli/tests/convert.rs
index 5de25e51..4f162994 100644
--- a/apps/deckcraft-cli/tests/convert.rs
+++ b/apps/deckcraft-cli/tests/convert.rs
@@ -21,7 +21,7 @@ fn convert_rejects_output_formats_it_cannot_write() {
     let out = Command::new(env!("CARGO_BIN_EXE_deckcraft-cli")).args(["run", "--sample", "--export"]).arg(&input).output().unwrap();
     assert!(out.status.success(), "{}", String::from_utf8_lossy(&out.stderr));
 
-    for name in ["out.odp", "out.gif", "out.svg", "out.outline", "out"] {
+    for name in ["out.odp", "out.bmp", "out.svg", "out.outline", "out"] {
         let target = dir.join(name);
         let out = cli(&[Path::new("convert"), &input, &target]);
         assert!(!out.status.success(), "{name}: convert should fail");
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e0d71985..a81450a0 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -237,7 +237,8 @@ fn writable_format_for_path_rejects_formats_deckcraft_does_not_write() {
     assert_eq!(f("a.pdf"), Some("pdf"));
     assert_eq!(f("a.jpg"), Some("jpeg"));
     assert_eq!(f("a.txt"), Some("outline"));
-    for path in ["a.odp", "a.gif", "a.svg", "a.outline", "a", "dir.v2/a"] {
+    assert_eq!(f("a.gif"), Some("gif"));
+    for path in ["a.odp", "a.bmp", "a.svg", "a.outline", "a", "dir.v2/a"] {
         assert_eq!(f(path), None, "{path}");
     }
 }
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index a9876e0a..34545650 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -506,6 +506,7 @@ impl SlideApp {
             "pptx" => ("pptx", "pptx", false),
             "outline" | "txt" => ("txt", "outline", false),
             "deckcraft" => ("deckcraft", "deckcraft", false),
+            "gif" => ("gif", "gif", false),
             other => {
                 self.set_status(format!("DeckCraft can't export “{other}”"));
                 return false;
@@ -535,6 +536,7 @@ impl SlideApp {
                 Ok(if format == "png" { img.to_png_at(dpi) } else { img.to_jpeg_at(92, Some(dpi)) })
             }
             "pdf" => deckcraft_engine::cmd::file::pdf_bytes(&doc, &extra),
+            "gif" => deckcraft_engine::cmd::file::gif_bytes(&doc, &extra),
             other => deckcraft_engine::cmd::file::save_bytes(&doc, other),
         };
         self.download(&suggested, bytes)

From 0e51b7b1fcd933c86271cd51e7c487754e7925f6 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:57:31 -0400
Subject: [PATCH 351/376] Fix up #67: use get_mut in the outline-morph cache
 instead of indexing

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/render/src/morph_path.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/crates/render/src/morph_path.rs b/crates/render/src/morph_path.rs
index 33af94ed..6947053f 100644
--- a/crates/render/src/morph_path.rs
+++ b/crates/render/src/morph_path.rs
@@ -76,9 +76,12 @@ impl Cache {
                 self.morphs.len() - 1
             }
         };
-        let (_, m, used) = &mut self.morphs[k];
-        *used = true;
         let scale = |x: Xfrm| Vec2::new(ratio(w, x.w), ratio(h, x.h));
+        let Some((_, m, used)) = self.morphs.get_mut(k) else {
+            // Not reachable (k was just found or pushed); align afresh rather than panic.
+            return Source::of(pm, s).build().at(pm.t, scale(pm.from_box), scale(pm.to_box));
+        };
+        *used = true;
         m.at(pm.t, scale(pm.from_box), scale(pm.to_box))
     }
 

From a4ea5b66db01fb79577cfb482f6052f6caee455d Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 14:59:50 -0400
Subject: [PATCH 352/376] Fix up #87: the web PNG/JPEG export path in
 SlideApp::export_as downloads every slide

Port web_image_files into main's export_as (keeping its DPI tags) and drop the PR's
old dialogs.rs export branch, which main no longer has.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/dialogs.rs | 16 ------------
 crates/ui-egui/src/lib.rs     | 47 ++++++++++++++++++++++++++++++++---
 2 files changed, 43 insertions(+), 20 deletions(-)

diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 342c78a8..9ca9839a 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -2605,22 +2605,6 @@ mod alt_text_tests {
     }
 }
 
-/// Images for the browser download: the current slide, or every slide (named `<name>1.png`, `<name>2.png`... like the native export) when `all`.
-fn web_image_files(doc: &deckcraft_model::Presentation, current: usize, all: bool, name: &str, ext: &str) -> Vec<(String, Vec<u8>)> {
-    let slides: Vec<usize> = if all { (0..doc.slides.len()).collect() } else { vec![current] };
-    let single = slides.len() == 1;
-    slides
-        .into_iter()
-        .enumerate()
-        .map(|(k, i)| {
-            let img = deckcraft_render::render_slide(doc, i, &deckcraft_render::RenderOpts { scale: 2.0, ..Default::default() });
-            let bytes = if ext == "png" { img.to_png() } else { img.to_jpeg(92) };
-            let file = if single { format!("{name}.{ext}") } else { format!("{name}{}.{ext}", k + 1) };
-            (file, bytes)
-        })
-        .collect()
-}
-
 #[cfg(test)]
 mod tests {
     use deckcraft_model::text::{Action, Hyperlink, Run, TextBody};
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 3df4477d..adac6654 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -470,10 +470,13 @@ impl SlideApp {
         let Some(doc) = self.session.active().map(|d| d.doc.clone()) else { return false };
         let bytes = match format {
             "png" | "jpeg" => {
-                let scale = 2.0;
-                let img = deckcraft_render::render_slide(&doc, slide, &deckcraft_render::RenderOpts { scale, ..Default::default() });
-                let dpi = deckcraft_render::dpi_for_scale(scale);
-                Ok(if format == "png" { img.to_png_at(dpi) } else { img.to_jpeg_at(92, Some(dpi)) })
+                // Every slide for "all slides", one download each, named like the desktop export (#64).
+                let name = self.session.active().map(|d| d.title()).unwrap_or_else(|| "Presentation".into());
+                let mut any = false;
+                for (file, bytes) in web_image_files(&doc, slide, all, &name, ext) {
+                    any = self.download(&file, Ok(bytes)) || any;
+                }
+                return any;
             }
             "pdf" => deckcraft_engine::cmd::file::pdf_bytes(&doc, &extra),
             other => deckcraft_engine::cmd::file::save_bytes(&doc, other),
@@ -1292,6 +1295,25 @@ pub fn now_ms() -> f64 {
     }
 }
 
+/// Images for the browser download: the current slide, or every slide (named `<name>1.png`,
+/// `<name>2.png`... like the native export) when `all`.
+fn web_image_files(doc: &deckcraft_model::Presentation, current: usize, all: bool, name: &str, ext: &str) -> Vec<(String, Vec<u8>)> {
+    let slides: Vec<usize> = if all { (0..doc.slides.len()).collect() } else { vec![current] };
+    let single = slides.len() == 1;
+    let scale = 2.0;
+    let dpi = deckcraft_render::dpi_for_scale(scale);
+    slides
+        .into_iter()
+        .enumerate()
+        .map(|(k, i)| {
+            let img = deckcraft_render::render_slide(doc, i, &deckcraft_render::RenderOpts { scale, ..Default::default() });
+            let bytes = if ext == "png" { img.to_png_at(dpi) } else { img.to_jpeg_at(92, Some(dpi)) };
+            let file = if single { format!("{name}.{ext}") } else { format!("{name}{}.{ext}", k + 1) };
+            (file, bytes)
+        })
+        .collect()
+}
+
 #[cfg(target_arch = "wasm32")]
 fn js_now() -> f64 {
     js_sys::Date::now()
@@ -1324,6 +1346,23 @@ mod tests {
 
     use super::*;
 
+    /// The browser "PNG images (all slides)" export yields one image per slide, not just the selected one (#64).
+    #[test]
+    fn web_export_all_slides_gives_one_file_per_slide() {
+        let mut doc = deckcraft_model::Presentation::default();
+        if let Some(first) = doc.slides.first().cloned() {
+            doc.slides.push(first.clone());
+            doc.slides.push(first);
+        }
+        assert_eq!(doc.slides.len(), 3);
+        let all = web_image_files(&doc, 1, true, "Deck", "png");
+        let names: Vec<&str> = all.iter().map(|(n, _)| n.as_str()).collect();
+        assert_eq!(names, ["Deck1.png", "Deck2.png", "Deck3.png"]);
+        let one = web_image_files(&doc, 1, false, "Deck", "png");
+        assert_eq!(one.len(), 1);
+        assert_eq!(one[0].0, "Deck.png");
+    }
+
     fn title_text(app: &SlideApp) -> String {
         let d = app.session.active().unwrap();
         let sh = &d.doc.slides[0].shapes[0];

From 330fc16c8cb36874dba497632302a4d37d6e43e2 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:02:43 -0400
Subject: [PATCH 353/376] Fix up merged PRs: zoom anchors on the unsnapped
 slide rect; zoom tests allow the pixel-grid snap

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/canvas.rs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 36317c1d..84a5a84a 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -109,12 +109,14 @@ pub fn show(app: &mut SlideApp, ui: &mut Ui) {
     }
     offset.x = offset.x.clamp(0.0, overflow.x);
     offset.y = offset.y.clamp(0.0, overflow.y);
-    // On the physical pixel grid, so the slide texture is one texel per device pixel (#184).
+    // On the physical pixel grid, so the slide texture is one texel per device pixel (#184). The
+    // zoom anchor keeps the unsnapped rect, so snapping never accumulates into drift.
     let ppp = ui.ctx().pixels_per_point();
-    let slide_rect = crate::textures::device_pixel_rect(content_rect.translate(-offset), ppp);
+    let exact_rect = content_rect.translate(-offset);
+    let slide_rect = crate::textures::device_pixel_rect(exact_rect, ppp);
     ui.data_mut(|d| {
         d.insert_temp(scroll_id, offset);
-        d.insert_temp(last_id, (slide_rect, scale));
+        d.insert_temp(last_id, (exact_rect, scale));
     });
     app.slide_rect = Some(slide_rect);
     app.canvas_scale = scale;
@@ -907,8 +909,10 @@ mod tests {
         h.run_steps(30);
     }
 
+    /// Within half a slide point, plus the half device pixel the slide moves to sit on the pixel
+    /// grid (#184).
     fn assert_near(a: Pos2, b: Pos2, what: &str) {
-        assert!((a - b).length() < 0.5, "{what}: {a:?} moved to {b:?}");
+        assert!((a - b).length() < 1.25, "{what}: {a:?} moved to {b:?}");
     }
 
     /// #106: wheel and pinch zoom zoomed toward the slide's corner instead of the pointer.

From 320e3a971a9432de2634a0a3cbb360a5c665c36c Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:04:16 -0400
Subject: [PATCH 354/376] Fix up merged PRs: one Editing group on Home, fmt,
 docs after the format/canvas/dialog merges
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Home: #556's Find and Replace join main's Replace Fonts… in one Editing group with the
  Selection Pane, as PowerPoint lays it out; the separate group pushed Replace Fonts… out of
  reach at 1400 px. The Replace Fonts test picks the dialog's Replace button, not the ribbon's.
- cargo fmt.
- docs: parity summary regenerated with `cargo xtask parity`; ui-parity's ruler row says tab
  stops are set on the ruler (#567/#569) as well as in the Tabs dialog.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/review.rs          |  1 -
 crates/ui-egui/src/canvas.rs             |  1 -
 crates/ui-egui/src/lib.rs                |  4 +--
 crates/ui-egui/src/replacefonts_tests.rs |  3 ++-
 crates/ui-egui/src/ribbon.rs             |  9 +++----
 docs/parity-checklist.md                 | 34 +++++-------------------
 docs/ui-parity.md                        |  2 +-
 7 files changed, 15 insertions(+), 39 deletions(-)

diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 13f4bde0..0becb304 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -398,7 +398,6 @@ fn replace_word(s: &mut Session, p: &Value) -> Result<Value> {
     s.execute("text.insert", &json!({"text": with}))
 }
 
-
 fn comparing(s: &Session) -> std::result::Result<(), String> {
     if s.active().is_some_and(|d| d.compare.is_some()) { Ok(()) } else { Err("not comparing".into()) }
 }
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index a732b413..e65b3c51 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -1154,7 +1154,6 @@ fn grid_fits(span: f32, step: f32) -> bool {
     span.is_finite() && span > 0.0 && step >= 1.0 && span / step <= 800.0
 }
 
-
 #[cfg(test)]
 mod tests {
     #![allow(clippy::unwrap_used, clippy::expect_used)]
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index e1892a08..61b31f1d 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1401,12 +1401,12 @@ mod animpane_tests;
 #[cfg(test)]
 mod browsetheme_tests;
 #[cfg(test)]
+mod compare_tests;
+#[cfg(test)]
 mod eyedropper_tests;
 #[cfg(test)]
 mod huge_deck_tests;
 #[cfg(test)]
-mod compare_tests;
-#[cfg(test)]
 mod ime_tests;
 #[cfg(test)]
 mod replacefonts_tests;
diff --git a/crates/ui-egui/src/replacefonts_tests.rs b/crates/ui-egui/src/replacefonts_tests.rs
index cec694bf..205c65aa 100644
--- a/crates/ui-egui/src/replacefonts_tests.rs
+++ b/crates/ui-egui/src/replacefonts_tests.rs
@@ -50,7 +50,8 @@ fn ribbon_button_opens_the_dialog_and_replaces() {
         d.fields.insert("to".into(), "Lato".into());
     }
     h.run_steps(2);
-    h.get_by_label("Replace").click();
+    // The ribbon has a Replace button too (Find and Replace); the dialog's is drawn last.
+    h.query_all_by_label("Replace").last().expect("the dialog's Replace button").click();
     h.run_steps(3);
     assert_eq!(run_font(&h).as_deref(), Some("Lato"));
     // The dialog stays open with a confirmation, like PowerPoint's.
diff --git a/crates/ui-egui/src/ribbon.rs b/crates/ui-egui/src/ribbon.rs
index eb71d4d9..0298ea06 100644
--- a/crates/ui-egui/src/ribbon.rs
+++ b/crates/ui-egui/src/ribbon.rs
@@ -1160,18 +1160,17 @@ fn home(app: &mut SlideApp, ui: &mut Ui) {
         big(app, ui, Icon::Picture, "Picture", "app.insertPictureDialog", json!({}));
     });
     drawing_group(app, ui);
+    // Editing, as in PowerPoint: Find, Replace and Replace Fonts, then the Selection Pane.
     group(ui, |ui| {
         ui.vertical(|ui| {
             small(app, ui, Icon::Search, "Find", "app.find", json!({}));
             small(app, ui, Icon::Spelling, "Replace", "app.replace", json!({}));
+            if small_button(ui, Icon::Fonts, "Replace Fonts…", enabled(app, "font.replace"), false).clicked() {
+                app.dialog = Some(crate::dialogs::Dialog::new("replaceFonts"));
+            }
         });
-    });
-    group(ui, |ui| {
         // Also under Arrange, but that is disabled until something is selected (#132).
         big(app, ui, Icon::SelectionPane, "Selection\nPane", "view.pane", json!({"pane": "selection"}));
-        if small_button(ui, Icon::Fonts, "Replace Fonts…", enabled(app, "font.replace"), false).clicked() {
-            app.dialog = Some(crate::dialogs::Dialog::new("replaceFonts"));
-        }
     });
     group(ui, |ui| {
         big(app, ui, Icon::DesignIdeas, "Design\nIdeas", "view.pane", json!({"pane": "designer"}));
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index fe541d2e..8992c00c 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -3,55 +3,33 @@
 > **Generated:** 2026-10-10 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 80%** over 191 features.
+**Weighted breadth parity: 82%** over 193 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 39 | 20 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 16 | 25 | 39% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 14 | 15 | 25 | 40% |
-| P1 | 65 | 39 | 21 | 5 | 76% |
-| P2 | 54 | 14 | 17 | 23 | 42% |
-| P2 | 54 | 14 | 14 | 26 | 39% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 16 | 25 | 39% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 16 | 25 | 39% |
+| P1 | 66 | 43 | 18 | 5 | 79% |
+| P2 | 55 | 16 | 20 | 19 | 47% |
 
 | Area | Parity |
 |---|---|
 | Application shell | 81% |
 | Files | 71% |
 | Slides | 90% |
-| Views | 93% |
-| Views | 95% |
-| Masters & themes | 85% |
-| Views | 90% |
+| Views | 98% |
 | Masters & themes | 88% |
-| Shapes | 88% |
 | Shapes | 91% |
 | Format | 83% |
 | Arrange | 100% |
-| Text | 80% |
+| Text | 82% |
 | Tables | 95% |
-| Text | 81% |
-| Text | 81% |
-| Tables | 89% |
 | Charts | 65% |
-| SmartArt | 33% |
-| Pictures | 52% |
 | SmartArt | 50% |
-| Pictures | 48% |
+| Pictures | 52% |
 | Media | 67% |
 | Transitions | 100% |
 | Animations | 79% |
 | Slide show | 68% |
-| Review | 60% |
-| Slide show | 66% |
 | Review | 70% |
 | Draw | 33% |
 | Undo & clipboard | 100% |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index b1e07a75..f5b43424 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -139,7 +139,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter; a right click selects the shape under the pointer first |
 | WordArt transform | Transform gallery | Shape Format ▸ Text Effects ▸ Transform (`format.textWarp`): No Transform, Follow Path and the other 36 presets. No adjust handles |
 | Exact size/position, lock aspect | yes | yes |
-| Rulers with indent markers and tab stops | yes | rulers yes; tab stops are set in the Tabs dialog, not on the ruler |
+| Rulers with indent markers and tab stops | yes | yes: indent markers and tab stops drag on the ruler (a click adds a tab, the corner selector picks its kind); Tabs dialog from Home › Paragraph and the Paragraph dialog |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
 | Drag and drop of files and between thumbnails | yes | yes |
 | Slide Sorter sections: a bar per section, add, rename in place, collapse, drag the whole section (its slides move with it) | yes | yes |

From fc118f17102e8874c52350c7fd37dff8cc8bfab7 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:04:42 -0400
Subject: [PATCH 355/376] Fix up #88: an image paste needs Command/Ctrl held on
 the V release

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 704dba95..a9258ce1 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1018,7 +1018,11 @@ impl SlideApp {
         for e in &events {
             match e {
                 egui::Event::Paste(_) | egui::Event::Key { key: egui::Key::V, pressed: true, .. } => self.v_seen = true,
-                egui::Event::Key { key: egui::Key::V, pressed: false, .. } => image_paste = !std::mem::take(&mut self.v_seen),
+                egui::Event::Key { key: egui::Key::V, pressed: false, modifiers, .. } => {
+                    // Only a release with Command/Ctrl held is a paste: a bare V release is not.
+                    let seen = std::mem::take(&mut self.v_seen);
+                    image_paste = !seen && (modifiers.command || modifiers.ctrl);
+                }
                 _ => {}
             }
         }
@@ -1633,6 +1637,10 @@ mod tests {
         harness.event(v(false));
         harness.run_steps(2);
         assert_eq!(pictures(harness.state()), 0);
+        // A V release without Command/Ctrl is not a paste.
+        harness.event(egui::Event::Key { key: egui::Key::V, physical_key: None, pressed: false, repeat: false, modifiers: egui::Modifiers::NONE });
+        harness.run_steps(2);
+        assert_eq!(pictures(harness.state()), 0);
         // What egui-winit sends for Ctrl+V with only an image on the clipboard: the release alone.
         harness.event(v(false));
         harness.run_steps(2);

From c448a3dba9b965f9421494e09ee83920a67ea76a Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:05:32 -0400
Subject: [PATCH 356/376] Fix up merged PRs: progress docs without the rows the
 union merges duplicated

Stale status lines and table rows from the older PRs are folded into main's current ones.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 ROADMAP.md                 |  5 -----
 docs/control-protocol.md   |  2 --
 docs/file-format-parity.md |  7 +------
 docs/gaps.md               |  9 +++------
 docs/hardware-parity.md    |  2 --
 docs/mcp.md                |  4 ++--
 docs/parity-checklist.md   |  3 ---
 docs/target-app-parity.md  |  3 ---
 docs/ui-parity.md          | 18 ++++--------------
 9 files changed, 10 insertions(+), 43 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index a901549a..458143c9 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -33,10 +33,6 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; percentages unchanged; previous: hours to ~95% per audience, ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Trim Media dialog follows the selection; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: chart trendlines are drawn; previous: trivial, chart trendlines round-trip; hours to ~95% per audience added; ready ~55%; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (text box frame drag while editing; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (progress log for 2026-10-12; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; before that: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (progress log: table cell editing and border resizing; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export in the progress log, #171; P2 breadth 36% → 37%; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Format Background picture options; percentages unchanged) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
@@ -50,7 +46,6 @@ format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and av
 | | Value | Kind |
 |---|---|---|
 | **Feature breadth** | **79%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 39%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
-| **Feature breadth** | **79%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 37%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
 | Menu-bar coverage | 59% of 217 app-specific PowerPoint menu items matched by name (lower bound) | measured: script over the PowerPoint menu dump and the 226 commands |
 | **Ready for real work** | **~55%** | estimated: weighted dimensions below |
 | Mainstream practitioner | ~53% | estimated: weekly-use areas × discounts for interaction (×0.92), stability (×0.92) and `.pptx` exchange (×0.88), [method](docs/target-app-parity.md#mainstream-practitioner-and-essentials-user) |
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index c6f45d92..a83a712d 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -27,8 +27,6 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `ui.render` | `{path?, slide?, scale?}` | Render a slide headlessly |
 | `ui.resize` / `ui.focus` | | Window control |
 | `show.start` / `show.end` | `{from?: slide index, custom?: name, reading?}` | Slide show. `custom` plays that custom show from its first slide and does not change Set Up. With no `from` and no `custom`, playback starts at the first slide of the show order |
-| `app.open` / `app.save` / `app.export` / `app.quit` | `{path, …}` | Files (export takes the `file.export` params, e.g. `{"path": "deck.pdf", "layout": "handouts", "perPage": 3}`) |
-| `show.start` / `show.end` | `{from?: slide index, presenter?, reading?}` | Slide show |
 | `app.open` / `app.save` / `app.export` / `app.quit` | `{path, …}` | Files (export takes the `file.export` params, e.g. `{"path": "deck.pdf", "layout": "handouts", "perPage": 3}` or `{"path": "deck.gif", "width": "large", "secondsPerSlide": 3, "loop": false}`) |
 
 The MCP server (`deckcraft-cli mcp`, see [mcp.md](mcp.md)) wraps the same methods for Claude
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 09de8768..597058c9 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -12,8 +12,6 @@
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus for tables, charts, animations, media, sections and masters; handout-master text kept; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a PNG or JPEG slide export records its resolution, so the default 2× picture is 144 dpi; previous: groups with a small legacy child coordinate space draw outlines at their own width, #233) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines are drawn; previously minor: chart trendlines round-trip; groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (formatted speaker notes) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export, #171; previous: major, created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -82,12 +80,9 @@ the round trip even though DeckCraft doesn't model it.
 | Presentation, slide size, sections (p14), custom shows | yes | yes | |
 | Slide masters, layouts, placeholders and inheritance | yes | yes | |
 | Themes: colour, font (Latin/EA/CS), effect schemes, background styles | yes | yes | Unknown theme parts kept |
-| Notes slides and notes master | yes | yes | Header, footer, date and slide-number text on the notes master is kept. Edited in View ▸ Notes Master |
+| Notes slides and notes master | yes | yes | Header, footer, date and slide-number text on the notes master is kept. Edited in View ▸ Notes Master. Notes keep their run and paragraph formatting (bold, italic, underline, size, levels, indents, bullets), shown and kept when edited in the notes pane and Notes Page (`crates/pptx/tests/notes.rs`). PDF notes pages print them as plain text; levels and bullets inherited from a custom notes master aren't shown |
 | Handout master | yes | yes | Header, footer, date and slide-number text is kept. Edited in View ▸ Handout Master |
 | Shapes: preset geometry (~180 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in `crates/geom/src/preset.rs` (and `preset/extra.rs`). Outlines, dashes, arrowheads and ink inside a group, and text, keep their size in points whatever the group's child-coordinate scale (#233). |
-| Notes slides and notes master | yes | yes | Notes keep their run and paragraph formatting (bold, italic, underline, size, levels, indents, bullets), shown and kept when edited in the notes pane and Notes Page (`crates/pptx/tests/notes.rs`). PDF notes pages print them as plain text; levels and bullets inherited from a custom notes master aren't shown; no notes-master editing view |
-| Handout master | no | no | |
-| Shapes: preset geometry (~150 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in `crates/geom/src/preset.rs` |
 | Fills: solid, gradient, picture (stretch/tile/crop), pattern, group | yes | yes | |
 | Lines: dash, compound, caps, joins, arrowheads | yes | yes | |
 | Effects: shadow, glow, soft edges, reflection | yes | yes | |
diff --git a/docs/gaps.md b/docs/gaps.md
index 7d23dc99..5ad63b51 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -25,7 +25,6 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; checklist row stays P so breadth stays 79%; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; checklist letters unchanged, breadth stays 79%, dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines are drawn; previous: minor, chart trendlines round-trip; 3-D bevel, camera and face lighting rendered; IME composition and CJK interface text landed, #101; core-workflow alpha gate added; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export landed, #171; the video gap stays; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture options are pane controls, not a new dialog; dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
@@ -357,11 +356,9 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
   Action Settings, Print, Insert Object…). 8–14 h.
 - **Dialogs**: 30 dialogs vs PowerPoint's ~60 (Font, Find/Replace dialog, Replace Fonts, Print,
-  Insert Object…). Size and Position, Bullets and Numbering, Action Settings and Date and Time are in. 8–14 h.
-- **Dialogs**: 27 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). Format Background picture options
-  (transparency, tile, offset, scale, alignment, mirror, and Apply to All copying a picture) are
-  pane controls on `design.background`, not another dialog. 8–14 h.
+  Insert Object…). Size and Position, Bullets and Numbering, Action Settings and Date and Time are in.
+  Format Background picture options (transparency, tile, offset, scale, alignment, mirror, and Apply
+  to All copying a picture) are pane controls on `design.background`, not another dialog. 8–14 h.
 - **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
 
 ## Hardware
diff --git a/docs/hardware-parity.md b/docs/hardware-parity.md
index acd70735..e2964b38 100644
--- a/docs/hardware-parity.md
+++ b/docs/hardware-parity.md
@@ -1,7 +1,6 @@
 # Hardware parity with PowerPoint
 
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (PNG and JPEG slide export record 144 dpi at the default 2 pixels per point; previous: IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (editor rasters on the Retina pixel grid, #184; previous: IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 
 What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
 ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -14,7 +13,6 @@ because it mostly follows from hardware use.
 | Window compositing on the GPU | Metal / DirectX | wgpu (Metal) | wgpu, DX12 only by default (#16) | wgpu (Vulkan, GL) | WebGPU, WebGL2 fallback |
 | Slide rasterization | GPU | **CPU** (`vello_cpu`) | CPU | CPU | CPU (wasm) |
 | Transitions and Morph frames | GPU | CPU-rendered slide images composited as textured quads on the GPU | same | same | same |
-| High-DPI / Retina | yes | yes | yes | yes | yes |
 | Picture export resolution | 2 px per point, tagged so the file is the slide's size | PNG `pHYs` and JPEG density, 144 dpi at the default 2 px per point | same | same | same |
 | High-DPI / Retina | yes | yes; editor slide rasters sit on the physical pixel grid (#184) | yes | yes | yes |
 | Wide gamut / HDR display | partly (P3 images) | no (sRGB) | no | no | no |
diff --git a/docs/mcp.md b/docs/mcp.md
index 4cdcae69..5f6c5756 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -35,6 +35,6 @@ A tool refuses an argument that is not in its schema (`insert_chart: unknown arg
 Useful commands for building decks: `slide.new {layout, title, body}`, `shape.insert {preset,
 rect, text}`, `shape.connect {from, to, preset}`, `shape.freeform {points, closed, smooth}`,
 `shape.merge {op, ids}`, `format.*`, `design.theme`, `transition.set`, `animation.set`,
-`chart.*`, `table.*`, `file.export {path, layout}`. `deckcraft-cli describe COMMAND` prints any
-`chart.*`, `table.*`, `file.export {path, layout}` (PDF) or `{path, width, secondsPerSlide, loop}` (GIF). `deckcraft-cli describe ID` prints any
+`chart.*`, `table.*`, `file.export {path, layout}` (PDF) or `{path, width, secondsPerSlide, loop}`
+(GIF). `deckcraft-cli describe COMMAND` prints any
 command's parameters.
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 58a04ece..dd53bafd 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -16,14 +16,11 @@ The summary between `<!-- SUMMARY -->
 | P2 | 54 | 14 | 15 | 25 | 40% |
 | P1 | 65 | 39 | 21 | 5 | 76% |
 | P2 | 54 | 14 | 17 | 23 | 42% |
-| P2 | 54 | 13 | 14 | 27 | 37% |
 
 | Area | Parity |
 |---|---|
 | Application shell | 81% |
 | Files | 71% |
-| Application shell | 71% |
-| Files | 72% |
 | Slides | 90% |
 | Views | 93% |
 | Masters & themes | 85% |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 0319ca9c..d6474e8a 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -17,7 +17,6 @@
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (essentials discount no longer cites the palette Export failure, #79; percentages unchanged; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; percentages unchanged; previous: hours to ~95% per audience, ready ~55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers; automation counted at 236 commands; the menu measurement and the d556ff9 snapshot still count 226; percentages unchanged; previous: hours to ~95% per audience, ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (animated GIF export, #171: P2 breadth 36% → 37%, overall unchanged; previous: minor, hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; percentages unchanged; previous: hours to ~95% per audience, ready ~55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
@@ -30,7 +29,6 @@ number.
 | Number | Value | Kind |
 |---|---|---|
 | **Feature breadth** (weighted checklist) | **79%** over 191 features (P0 92%, P1 75%, P2 39%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md) |
-| **Feature breadth** (weighted checklist) | **79%** over 191 features (P0 92%, P1 75%, P2 37%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md), rows re-scored 2026-10-10 |
 | Menu-bar coverage | **59%** (128 of 217 app-specific PowerPoint menu items have a DeckCraft command or UI label of the same name) | **measured** (heuristic lower bound): script matching the 2026-10-07 PowerPoint menu dump against the 226 engine command labels and the UI's strings; excludes the app, Window and Help menus and the subtitle language lists |
 | **Ready for real work** | **~55%** | **estimated**: weighted dimension table below (was ~56% until the features row was recomputed from written area weights) |
 | **Mainstream practitioner** | **~53%** | **estimated**: [method below](#mainstream-practitioner-and-essentials-user) |
@@ -243,7 +241,6 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
   latin faces (one scheme on that master, not a library of saved font schemes, and not East
   Asian or complex-script faces).
   effect schemes (Design ▸ Effects: DeckCraft, Soft, Crisp, Lift, Glow, Plain),
-  backgrounds (solid, gradient, picture, pattern), slide size presets.
   backgrounds (solid, gradient, picture, pattern; a solid fill's transparency; picture
   transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture),
   slide size presets.
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index 2853063c..64e68053 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -20,10 +20,6 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Trim Media dialog follows the selection; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (the frame of a text box being edited moves it; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (table cells: caret, clicks between cells, border resizing; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (editor slide rasters sit on the physical pixel grid, #184; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 > **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-14 · **Change:** minor (File › New starter decks; previous: minor, text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Sorter sections: add, rename, collapse, drag a whole section; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
@@ -93,9 +89,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 |---|---|---|
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line (dash, compound, cap, join, begin/end arrows and sizes), some effects, size (lock aspect ratio); no 3-D, thin picture/texture options |
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, shadow/glow/reflection details (colour, transparency, blur, angle, distance, size), soft edges, size; no 3-D, thin picture/texture options |
-| Format Background pane | yes | yes |
 | Slide Master | Insert Layout, Rename, Delete, Preserve, Insert Placeholder, Title and Footers | Insert Layout, Rename, Delete, Insert Placeholder, and Preserve, Title and Footers checkboxes (`master.preserve`, `master.placeholders`). A master thumbnail selects the master |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
 | Format Background pane | yes | yes: solid transparency; picture transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture. Stretch insets and rotate-with-shape are command parameters |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
 | Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
@@ -133,7 +127,6 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Exact size/position, lock aspect | yes | yes — Size and Position dialog (height, width, rotation, scale %, lock aspect, position from the top-left), one undo step; ribbon spinners still resize one side at a time |
 | Drag the frame of a text box being edited to move it | yes | yes |
 | Table cells: caret and selection in the cell, click into another cell, drag row and column borders | yes | yes; no cell-range selection by dragging across cells |
-| Exact size/position, lock aspect | yes | yes |
 | Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter; a right click selects the shape under the pointer first |
 | WordArt transform | Transform gallery | Shape Format ▸ Text Effects ▸ Transform (`format.textWarp`): No Transform, Follow Path and the other 36 presets. No adjust handles |
@@ -184,13 +177,10 @@ Alt+Shift+arrows in text are handled elsewhere (#78, #93).
 Colours, spacing, ribbon card and tab geometry follow the observations in
 `plan/powerpoint/01-observed-ui.md`; the ribbon and menu icons are original (~240, drawn in code)
 and must not imitate Microsoft's. Insert › Icons places Lucide stroke icons (ISC, release 1.56.0)
-on the slide as shapes. No pixel comparison against PowerPoint screenshots has been run since
-2026-10-07. Cross-app icon consistency is open (#73, #56).
-`plan/powerpoint/01-observed-ui.md`; icons are original (~240, drawn in code or Lucide) and must not
-imitate Microsoft's. The editing canvas, thumbnails and layout previews are drawn on the physical
-pixel grid, so a Retina display does not blur them between pixels (#184). No pixel comparison
-against PowerPoint screenshots has been run since 2026-10-07. Cross-app icon consistency is open
-(#73, #56).
+on the slide as shapes. The editing canvas, thumbnails and layout previews are drawn on the
+physical pixel grid, so a Retina display does not blur them between pixels (#184). No pixel
+comparison against PowerPoint screenshots has been run since 2026-10-07. Cross-app icon
+consistency is open (#73, #56).
 
 ## Estimates
 

From 6d23d5b5b55b91841e47d9bb104466477ef7d0e0 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:09:26 -0400
Subject: [PATCH 357/376] Fix up #139: the Tab test turns off AutoCorrect,
 which main now capitalises with

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 64296eab..cda33549 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1661,7 +1661,11 @@ mod tests {
                 app.logic(ui.ctx());
                 app.ui(ui);
             },
-            SlideApp::new(Session::with_new(), Services::default()),
+            {
+                let mut session = Session::with_new();
+                session.prefs.autocorrect = false;
+                SlideApp::new(session, Services::default())
+            },
         );
         harness.run_steps(2);
         let title = harness.state().session.active().unwrap().doc.slides[0].shapes[0].id.0;

From a0facd60af4be004ce86303d9bdb220830d1e7bc Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:10:48 -0400
Subject: [PATCH 358/376] Fix up merged PRs: cargo fmt, and the write_file
 tests may unwrap

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/file.rs   | 2 ++
 crates/engine/src/tools.rs      | 7 +------
 crates/ui-egui/src/backstage.rs | 6 +-----
 crates/ui-egui/src/lib.rs       | 5 +----
 crates/ui-egui/src/panes.rs     | 7 +++++--
 crates/ui-egui/src/sorter.rs    | 2 +-
 6 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index b0b76f29..127ae31f 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -643,6 +643,8 @@ mod color_at_tests;
 
 #[cfg(all(test, not(target_arch = "wasm32")))]
 mod tests {
+    #![allow(clippy::unwrap_used, clippy::expect_used)]
+
     use super::write_file;
 
     fn scratch(name: &str) -> std::path::PathBuf {
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index 9c0dcabc..73f41ffb 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -1064,12 +1064,7 @@ impl Session {
             || matches!(
                 self.hit_test(p, tol),
                 Some(
-                    Hit::Resize { .. }
-                        | Hit::Rotate { .. }
-                        | Hit::Adjust { .. }
-                        | Hit::Frame { .. }
-                        | Hit::TableColumn { .. }
-                        | Hit::TableRow { .. }
+                    Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. } | Hit::Frame { .. } | Hit::TableColumn { .. } | Hit::TableRow { .. }
                 )
             )
         {
diff --git a/crates/ui-egui/src/backstage.rs b/crates/ui-egui/src/backstage.rs
index fa413c74..9eb50898 100644
--- a/crates/ui-egui/src/backstage.rs
+++ b/crates/ui-egui/src/backstage.rs
@@ -613,11 +613,7 @@ fn recent_list(app: &mut SlideApp, ui: &mut Ui, query: &str, limit: usize) {
                 p.text(pos2(visible_right - 82.0, rect.center().y), Align2::RIGHT_CENTER, "(missing)", theme::font(11.0), t.text_dim);
             }
         }
-        let resp = if missing {
-            resp.on_hover_text(format!("{path} — this file can't be found"))
-        } else {
-            resp.on_hover_text(&path)
-        };
+        let resp = if missing { resp.on_hover_text(format!("{path} — this file can't be found")) } else { resp.on_hover_text(&path) };
         // Remove from the list: a real labelled widget on top of the row, with a code-drawn icon
         // (a text glyph would need a font that has it).
         let x = ui.allocate_rect(
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 34545650..3b67ea71 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -1943,10 +1943,7 @@ mod tests {
         harness.get_by_label("missing.deckcraft").click();
         harness.run_steps(2);
         assert!(harness.state().toast.is_some(), "the open error was raised");
-        assert!(
-            harness.get_all_by_label_contains("missing.deckcraft").count() >= 2,
-            "the open error is drawn on the page, next to the entry"
-        );
+        assert!(harness.get_all_by_label_contains("missing.deckcraft").count() >= 2, "the open error is drawn on the page, next to the entry");
     }
 
     /// #172: a Recent entry can be removed from the list.
diff --git a/crates/ui-egui/src/panes.rs b/crates/ui-egui/src/panes.rs
index 76cde256..89ea94a4 100644
--- a/crates/ui-egui/src/panes.rs
+++ b/crates/ui-egui/src/panes.rs
@@ -1096,8 +1096,11 @@ fn designer(app: &mut SlideApp, ui: &mut Ui) {
                 idx,
                 &deckcraft_render::RenderOpts { scale: px as f64 / d.slide_size.width.max(1.0), size: Some((px, h)), ..Default::default() },
             );
-            let tex =
-                ui.ctx().load_texture(format!("idea-{name}"), crate::textures::to_color_image(&img, false), crate::textures::editor_texture_options());
+            let tex = ui.ctx().load_texture(
+                format!("idea-{name}"),
+                crate::textures::to_color_image(&img, false),
+                crate::textures::editor_texture_options(),
+            );
             cache.tex.push((name, tex, px, h));
         };
         for (id, _) in &ideas {
diff --git a/crates/ui-egui/src/sorter.rs b/crates/ui-egui/src/sorter.rs
index 92d6d2e9..28b4b1a5 100644
--- a/crates/ui-egui/src/sorter.rs
+++ b/crates/ui-egui/src/sorter.rs
@@ -6,9 +6,9 @@ use deckcraft_model::{Presentation, SlideId};
 use egui::{Align2, Color32, CornerRadius, Rect, Sense, Stroke, Ui, WidgetInfo, WidgetType, pos2, vec2};
 use serde_json::json;
 
+use crate::SlideApp;
 use crate::icons::{self, Icon};
 use crate::theme::{self, Tokens};
-use crate::SlideApp;
 
 /// Sorter-only state. Nothing here is part of the document.
 #[derive(Debug, Default)]

From 4b6f307ebbc777426a8bf1704de6eb11986ce683 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:19:02 -0400
Subject: [PATCH 359/376] Fix up #169: auto RTL lives only in the engine and
 right-aligns only unaligned text

Drop the layout-time direction detection in crates/text (and its test); the engine's
promote_rtl_if_needed sets align Right only when neither the paragraph nor what it
inherits (list styles, layout, master) resolves an alignment. right_to_left_paragraphs
types its original Arabic text again, after an explicit LTR so the toggle it tests
starts from left-to-right.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/text.rs | 64 ++++++++++++++++++++++++++++++++---
 crates/engine/src/tests.rs    | 22 +++++++++---
 crates/text/src/lib.rs        |  7 ++--
 crates/text/src/tests.rs      | 13 -------
 4 files changed, 78 insertions(+), 28 deletions(-)

diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 0d43c62f..b2c924a3 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -305,6 +305,7 @@ fn typed(s: &Session, body: &TextBody, at: Pos, text: &str) -> String {
 }
 
 pub(crate) fn insert_text(s: &mut Session, text: &str, props: Option<RunProps>) -> Result<Value> {
+    let inherited = inherited_aligns_for_edit(s);
     let text = {
         let st = s.doc()?;
         match &st.selection.text {
@@ -324,7 +325,7 @@ pub(crate) fn insert_text(s: &mut Session, text: &str, props: Option<RunProps>)
         t.caret = c;
         for pi in at.0..=c.0 {
             if let Some(para) = body.paragraphs.get_mut(pi) {
-                promote_rtl_if_needed(para);
+                promote_rtl_if_needed(para, &inherited);
             }
         }
         c
@@ -333,10 +334,37 @@ pub(crate) fn insert_text(s: &mut Session, text: &str, props: Option<RunProps>)
     Ok(json!({"caret": [pos.0, pos.1]}))
 }
 
-fn promote_rtl_if_needed(para: &mut deckcraft_model::text::Paragraph) {
+/// Per outline level (0..=8), whether shape `id` on the current slide already resolves an
+/// alignment for its paragraphs (its own list style, the layout's or the master's). All `false`
+/// when the shape can't be resolved (notes, a shape that is gone).
+fn inherited_aligns(s: &Session, id: ShapeId) -> [bool; 9] {
+    let mut out = [false; 9];
+    let Ok(st) = s.doc() else { return out };
+    let Some(sh) = st.shape(id) else { return out };
+    let Some(ctx) = ctx_for(&st.doc, &st.selection) else { return out };
+    for (lvl, set) in out.iter_mut().enumerate() {
+        let para = deckcraft_model::text::Paragraph { level: lvl as u8, ..Default::default() };
+        *set = resolve::para(&ctx, sh, &para).align.is_some();
+    }
+    out
+}
+
+/// The aligns [`inherited_aligns`] gives for the text being edited (none for notes).
+fn inherited_aligns_for_edit(s: &Session) -> [bool; 9] {
+    match s.doc().ok().and_then(|st| st.selection.text.clone()) {
+        Some(t) if !t.notes => inherited_aligns(s, t.shape),
+        _ => [false; 9],
+    }
+}
+
+/// A paragraph with no direction of its own whose first strong character is right-to-left
+/// (Arabic, Hebrew, Kurdish…) becomes right-to-left, and right-aligned when nothing (the
+/// paragraph or what it inherits, `inherited`) sets its alignment.
+fn promote_rtl_if_needed(para: &mut deckcraft_model::text::Paragraph, inherited: &[bool; 9]) {
     if para.props.rtl.is_none() && deckcraft_model::bidi::first_strong_is_rtl(&para.text()) {
         para.props.rtl = Some(true);
-        if para.props.align.is_none() {
+        let inherits_align = inherited.get(usize::from(para.level)).copied().unwrap_or(false);
+        if para.props.align.is_none() && !inherits_align {
             para.props.align = Some(Align::Right);
         }
     }
@@ -612,6 +640,7 @@ fn autocorrect_options(s: &mut Session, p: &Value) -> Result<Value> {
 }
 
 pub(crate) fn paste_body(s: &mut Session, src: &TextBody) -> Result<Value> {
+    let inherited = inherited_aligns_for_edit(s);
     let pos = edit_text(s, |body, t| {
         let (a, b) = t.ordered();
         let at = ed::delete(body, a, b);
@@ -620,7 +649,7 @@ pub(crate) fn paste_body(s: &mut Session, src: &TextBody) -> Result<Value> {
         t.caret = c;
         for pi in at.0..=c.0 {
             if let Some(para) = body.paragraphs.get_mut(pi) {
-                promote_rtl_if_needed(para);
+                promote_rtl_if_needed(para, &inherited);
             }
         }
         c
@@ -1056,6 +1085,7 @@ fn set(s: &mut Session, p: &Value) -> Result<Value> {
         None => s.doc()?.selection.shapes.first().copied().ok_or_else(|| bad("text.set", "missing `id` (or select a shape)"))?,
     };
     let cell = p.get("cell").and_then(Value::as_array).and_then(|a| Some((a.first()?.as_u64()? as usize, a.get(1)?.as_u64()? as usize)));
+    let inherited = inherited_aligns(s, id);
     edit_shapes(s, &json!({"id": id}), "text.set", |sh| {
         let target = match (&mut sh.kind, cell) {
             (ShapeKind::Table(t), Some((r, c))) => t.cell_mut(r, c).map(|x| &mut x.text),
@@ -1074,7 +1104,7 @@ fn set(s: &mut Session, p: &Value) -> Result<Value> {
                 para.level = *lv;
                 para.props = pp.clone();
             }
-            promote_rtl_if_needed(para);
+            promote_rtl_if_needed(para, &inherited);
             for r in &mut para.runs {
                 r.props = keep.clone();
             }
@@ -1284,6 +1314,30 @@ fn replace_font(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(json!({"replaced": n}))
 }
 
+#[cfg(test)]
+mod rtl_promote_tests {
+    use deckcraft_model::text::{Align, Paragraph, Run};
+
+    use super::promote_rtl_if_needed;
+
+    fn para(text: &str) -> Paragraph {
+        Paragraph { runs: vec![Run::new(text)], ..Default::default() }
+    }
+
+    #[test]
+    fn right_aligns_only_when_no_alignment_is_set_or_inherited() {
+        let mut p = para("مرحبا");
+        promote_rtl_if_needed(&mut p, &[false; 9]);
+        assert_eq!((p.props.rtl, p.props.align), (Some(true), Some(Align::Right)));
+        let mut p = para("مرحبا");
+        promote_rtl_if_needed(&mut p, &[true; 9]);
+        assert_eq!((p.props.rtl, p.props.align), (Some(true), None));
+        let mut p = para("Hello مرحبا");
+        promote_rtl_if_needed(&mut p, &[false; 9]);
+        assert_eq!((p.props.rtl, p.props.align), (None, None));
+    }
+}
+
 #[cfg(test)]
 mod replace_font_tests {
     use serde_json::json;
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e62ce1a8..663324aa 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -488,7 +488,9 @@ fn right_to_left_paragraphs() {
     let mut s = session();
     let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
     s.execute("text.edit", &json!({"id": title})).unwrap();
-    s.execute("text.insert", &json!({"text": "Year 2024 (Retrait) only"})).unwrap();
+    // Explicitly left-to-right first, so typing Arabic doesn't already turn it right-to-left (#169).
+    s.execute("format.rtl", &json!({"on": false})).unwrap();
+    s.execute("text.insert", &json!({"text": "سنة 2024 (Retrait) فقط"})).unwrap();
     s.execute("format.rtl", &json!({})).unwrap();
     let para = |s: &Session| s.doc().unwrap().current_slide().unwrap().shapes[0].text.as_ref().unwrap().paragraphs[0].props.clone();
     assert_eq!(para(&s).rtl, Some(true));
@@ -530,16 +532,26 @@ fn typing_kurdish_or_arabic_auto_detects_rtl_and_advances_caret_smoothly() {
         }
         last_x = cx;
 
-        // Caret must remain near the right margin (e.g. > 400.0 pt in title placeholder)
-        // and must NOT jump back to the left margin (e.g. ~7.2 pt).
-        assert!(cx > 400.0, "caret should not jump to left margin: {cx}");
+        // The title is centred: the caret must NOT jump back to the left margin (~7.2 pt).
+        assert!(cx > 100.0, "caret should not jump to left margin: {cx}");
     }
 
     // Caret advances leftwards overall as text is appended
     assert!(last_x < first_x.unwrap(), "caret should advance leftwards: last={last_x} first={:?}", first_x);
     let para = s.doc().unwrap().current_slide().unwrap().shapes[0].text.as_ref().unwrap().paragraphs[0].props.clone();
     assert_eq!(para.rtl, Some(true), "auto-detected as RTL");
-    assert_eq!(para.align, Some(deckcraft_model::text::Align::Right), "aligned right");
+    assert_eq!(para.align, None, "the title keeps the alignment it inherits");
+
+    // A text box inherits the deck's default (left) alignment, which it keeps too.
+    s.execute("text.exit", &json!({})).ok();
+    let id = s.execute("insert.textBox", &json!({"rect": [10, 10, 300, 100], "text": ""})).unwrap()["id"].as_u64().unwrap();
+    s.execute("text.edit", &json!({"id": id})).unwrap();
+    s.execute("text.insert", &json!({"text": "مرحبا"})).unwrap();
+    let st = s.doc().unwrap();
+    let sh = st.shape(deckcraft_model::ShapeId(id as u32)).unwrap();
+    let para = sh.text.as_ref().unwrap().paragraphs[0].props.clone();
+    assert_eq!(para.rtl, Some(true));
+    assert_eq!(para.align, None, "the text box keeps the alignment it inherits");
 }
 
 #[test]
diff --git a/crates/text/src/lib.rs b/crates/text/src/lib.rs
index 70c58a29..b9e28fb1 100644
--- a/crates/text/src/lib.rs
+++ b/crates/text/src/lib.rs
@@ -712,11 +712,8 @@ fn shape_para(ctx: &Ctx, shape: &Shape, body: &TextBody, pi: usize, scale: f64,
             rtl: false,
         };
     };
-    let mut props = resolve::para(ctx, shape, para);
-    let rtl = props.rtl.unwrap_or_else(|| deckcraft_model::bidi::first_strong_is_rtl(&para.text()));
-    if rtl && para.props.align.is_none() {
-        props.align = Some(Align::Right);
-    }
+    let props = resolve::para(ctx, shape, para);
+    let rtl = props.rtl.unwrap_or(false);
     let mut styles: Vec<Style> = vec![];
     let mut faces: Vec<Arc<FontFace>> = vec![];
     // The logical paragraph: its text and each character's style.
diff --git a/crates/text/src/tests.rs b/crates/text/src/tests.rs
index e0936969..452e46b5 100644
--- a/crates/text/src/tests.rs
+++ b/crates/text/src/tests.rs
@@ -504,19 +504,6 @@ fn rtl_left_and_center_alignment() {
     assert!((c - (l.inner.x0 + l.inner.x1) / 2.0).abs() < 0.5);
 }
 
-#[test]
-fn layout_auto_detects_rtl_from_first_strong_character() {
-    let (p, mut sh) = bidi_setup(vec![Run::new("من ناوم هێڤاره")], 400.0, false, Align::Left);
-    // Leave props.rtl as None and props.align as None (unassigned)
-    sh.text.as_mut().unwrap().paragraphs[0].props.rtl = None;
-    sh.text.as_mut().unwrap().paragraphs[0].props.align = None;
-    let l = lay(&p, &sh, 400.0, 300.0);
-    let line = &l.lines[0];
-    assert!(line.rtl, "line should auto-detect as RTL");
-    // Line aligns to the right edge
-    assert!(line.extent.1 > 350.0, "extent right: {}", line.extent.1);
-}
-
 #[test]
 fn bidi_caret_stops_round_trip_through_hit_testing() {
     for rtl in [true, false] {

From 708a22c51ff0cb8ac23dcdcd64a846d42c5060b0 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:22:27 -0400
Subject: [PATCH 360/376] Fix up merged PRs: Opaque shapes in tests carry
 #209's new parts field

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/pptx/tests/corpus_media.rs | 4 ++--
 crates/render/src/tests.rs        | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/crates/pptx/tests/corpus_media.rs b/crates/pptx/tests/corpus_media.rs
index 26a9539d..c03f16d3 100644
--- a/crates/pptx/tests/corpus_media.rs
+++ b/crates/pptx/tests/corpus_media.rs
@@ -63,9 +63,9 @@ fn corpus() -> (Presentation, Vec<u8>, Vec<u8>, Vec<u8>) {
 
     let mut objects = new_slide(&mut p, "Objects");
     let mut diagram = shape(&mut p, "Diagram", 40.0, 80.0, 288.0, 144.0);
-    diagram.kind = ShapeKind::Opaque { xml: SMARTART.into(), preview: None, label: "SmartArt".into() };
+    diagram.kind = ShapeKind::Opaque { xml: SMARTART.into(), preview: None, label: "SmartArt".into(), parts: vec![] };
     let mut embedded = shape(&mut p, "Embedded", 340.0, 80.0, 144.0, 72.0);
-    embedded.kind = ShapeKind::Opaque { xml: OLE.into(), preview: None, label: "DeckCraft.Note.1".into() };
+    embedded.kind = ShapeKind::Opaque { xml: OLE.into(), preview: None, label: "DeckCraft.Note.1".into(), parts: vec![] };
     let mut block_shape = shape(&mut p, "Block", 40.0, 240.0, 120.0, 90.0);
     block_shape.kind = ShapeKind::Model3d { media: block_id, poster: None };
     let mut globe_shape = shape(&mut p, "Globe", 180.0, 240.0, 160.0, 120.0);
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 7b700341..204ee562 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -1436,7 +1436,7 @@ fn an_object_deckcraft_doesnt_model_shows_its_preview_picture() {
         let sh = Shape {
             id: ShapeId(600),
             xfrm: Some(Xfrm::new(100.0, 100.0, 400.0, 200.0)),
-            kind: ShapeKind::Opaque { xml: String::new(), preview: with_preview.then_some(media), label: "Package".into() },
+            kind: ShapeKind::Opaque { xml: String::new(), preview: with_preview.then_some(media), label: "Package".into(), parts: vec![] },
             ..Default::default()
         };
         std::sync::Arc::make_mut(&mut p.slides[0]).shapes = vec![sh];

From d66833b7c23ee74c3084862524fa6b0d8ddbaeed Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:23:16 -0400
Subject: [PATCH 361/376] Fix up merged PRs: land-r6's changes fitted to the
 landing branch
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- review.thesaurus's params doc parses under describe's grammar; describe's edit.copy test
  expects the landing branch's {text, html?} answer.
- The Language dialog test picks the landing branch's "Français (France)" entry; the Format
  Background test allows the pane's title to appear twice.
- Progress docs rebuilt from the landing branch's versions with land-r6's rows applied on top,
  so the union merge no longer drops the pen-pressure, ui.pointer and ui.key rows.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 ROADMAP.md                             | 3 +++
 apps/deckcraft-cli/tests/cli.rs        | 2 +-
 crates/engine/src/cmd/review.rs        | 2 +-
 crates/engine/src/tools.rs             | 8 +++++++-
 crates/ui-egui/src/background_tests.rs | 2 +-
 crates/ui-egui/src/lib.rs              | 6 ++----
 docs/control-protocol.md               | 2 ++
 docs/gaps.md                           | 4 +++-
 docs/hardware-parity.md                | 8 ++++++--
 docs/parity-checklist.md               | 3 +--
 docs/roadmap.md                        | 6 ++++++
 docs/target-app-parity.md              | 6 ++++--
 docs/ui-parity.md                      | 1 -
 13 files changed, 37 insertions(+), 16 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 425f48bd..db0d810f 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -42,6 +42,7 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Paragraph dialog; previous: trivial, Font dialog; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options dialog; previous: hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt adjust handles; previous: hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: pen pressure scales ink width; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -233,6 +234,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-14 | Font dialog (Home › Font, the shape menu, Cmd+T): family, size, bold, italic, underline, colour, strikethrough, baseline, caps and character spacing, applied in one undo step. Breadth stays 79% |
 | 2026-10-13 | Grid Options: spacing, snap to grid, snap to other objects, and whether gridlines and guides are drawn; the on-screen grid uses that spacing |
 | 2026-10-13 | WordArt adjust handles: a selected text warp shows one yellow handle per adjust, and dragging it sets that guide value (one undo step) |
+| 2026-10-14 | Draw: pen pressure scales ink width when the pointer reports it (a mouse or a missing reading stays at the pen width; a stroke saved as a flat 0.5 still draws at the pen width). Tilt is not read |
 | 2026-10-13 | Slide transitions like PowerPoint: every transition and option measured frame by frame against PowerPoint's video export and retuned (curves, directions, soft edges, 3-D perspective, contents moving over backgrounds); PowerPoint's own XML elements and defaults read and written (diagonal Wipe, Zoom, Shape In/Out, Glitter Hexagons, Shred In/Out, Page Curl Single); `deckcraft-cli render-transition` renders frames headless |
 | 2026-10-13 | Wild text cases measured against PowerPoint (102 synthetic slides): bidi by run language, East Asian vertical text upright, mongolianVert/wordArtVert/wordArtVertRtl, underline styles and strikethrough at the font's metrics, centre/right/decimal tabs, East Asian, Thai, Hindi, Arabic and Hebrew numbering, small caps, all-caps "ß", transparent text, soft hyphens, kinsoku, rtlCol and just/dist anchoring, emoji presentation, fallback faces that no longer move the baseline |
 | 2026-10-13 | Render matches PowerPoint more closely on wild shape, picture and table cases: even-odd custom paths, dashes and caps, arrowheads, radial and path gradients, tile rects, rotWithShape, gradient lines, shadows cast by what is drawn (group and perspective too), group fill, picture borders, tiles, reflection, recolour (biLevel, alphaInv, brightness/contrast), table borders and grid default, 20+ preset shapes by their ECMA formulas, default miter joins, and approximate 3-D bevels, cameras and face lighting |
@@ -313,6 +315,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-14 | trivial | Progress log: Paragraph dialog |
 | 2026-10-14 | trivial | Progress log: Font dialog |
 | 2026-10-13 | trivial | Progress log: Grid Options dialog |
+| 2026-10-14 | trivial | Progress log: pen pressure scales ink width |
 | 2026-10-13 | trivial | Progress log: wild text cases |
 | 2026-10-13 | trivial | Progress log: slide show for interactive decks |
 | 2026-10-12 | minor | Progress log: table cell editing and border resizing |
diff --git a/apps/deckcraft-cli/tests/cli.rs b/apps/deckcraft-cli/tests/cli.rs
index 8932c909..d04e55c7 100644
--- a/apps/deckcraft-cli/tests/cli.rs
+++ b/apps/deckcraft-cli/tests/cli.rs
@@ -104,7 +104,7 @@ Acts on the selected text or shapes.
 Run it with: deckcraft-cli run --cmd 'format.size={…}'
 "
     );
-    assert!(stdout(&cli(&["describe", "edit.copy"])).contains("Answers with {text}.\n\nRun it with: deckcraft-cli run --cmd edit.copy\n"));
+    assert!(stdout(&cli(&["describe", "edit.copy"])).contains("Answers with {text, html?}.\n\nRun it with: deckcraft-cli run --cmd edit.copy\n"));
     assert!(stdout(&cli(&["describe", "text.set"])).contains("Note: replaces the whole text, keeping the first run's formatting\n"));
     assert_eq!(
         stdout(&cli(&["describe", "shape.setDefault"])),
diff --git a/crates/engine/src/cmd/review.rs b/crates/engine/src/cmd/review.rs
index 52045e99..4358a004 100644
--- a/crates/engine/src/cmd/review.rs
+++ b/crates/engine/src/cmd/review.rs
@@ -46,7 +46,7 @@ pub fn specs() -> Vec<CommandSpec> {
         ),
         cmd!(noundo "review.addToDictionary", "Add to Dictionary", ["Review", "Proofing"], None, "{word} → {word, file} (append to the user dictionary file; not an undo step)", always, add_to_dictionary),
         cmd!(query "review.dictionary", "Spelling Dictionary", ["Review", "Proofing"], None, "{lang?} → {lang, available, found, folders} (whether review.spelling has a dictionary, and which file)", always, dictionary_info),
-        cmd!(query "review.thesaurus", "Thesaurus", ["Review", "Proofing"], None, "{word?: default the selected word, or the word at the caret} → {word, senses: [{word, synonyms}]}", has_doc, thesaurus),
+        cmd!(query "review.thesaurus", "Thesaurus", ["Review", "Proofing"], None, "{word? (default: the selected word, or the word at the caret)} → {word, senses: [{word, synonyms}]}", has_doc, thesaurus),
         cmd!(
             "review.replaceWord",
             "Insert Synonym",
diff --git a/crates/engine/src/tools.rs b/crates/engine/src/tools.rs
index 768e73b2..5c004de2 100644
--- a/crates/engine/src/tools.rs
+++ b/crates/engine/src/tools.rs
@@ -1224,7 +1224,13 @@ impl Session {
             || matches!(
                 self.hit_test(p, tol),
                 Some(
-                    Hit::Resize { .. } | Hit::Rotate { .. } | Hit::Adjust { .. } | Hit::Warp { .. } | Hit::Frame { .. } | Hit::TableColumn { .. } | Hit::TableRow { .. }
+                    Hit::Resize { .. }
+                        | Hit::Rotate { .. }
+                        | Hit::Adjust { .. }
+                        | Hit::Warp { .. }
+                        | Hit::Frame { .. }
+                        | Hit::TableColumn { .. }
+                        | Hit::TableRow { .. }
                 )
             )
         {
diff --git a/crates/ui-egui/src/background_tests.rs b/crates/ui-egui/src/background_tests.rs
index b2a7a879..0bb3d229 100644
--- a/crates/ui-egui/src/background_tests.rs
+++ b/crates/ui-egui/src/background_tests.rs
@@ -38,7 +38,7 @@ fn picture_fill_shows_transparency_and_tiling() {
     let mut s = Session::with_new();
     s.execute("design.background", &json!({"picture": PNG, "name": "dot.png"})).unwrap();
     let mut h = harness(SlideApp::new(s, Services::default()));
-    let _ = h.get_by_label("Format Background");
+    assert!(h.query_all_by_label("Format Background").next().is_some(), "the pane is open");
     let _ = h.get_by_label("Picture or texture fill");
     assert!(h.query_all_by_label("Transparency").next().is_some());
     h.get_by_label("Tile picture as texture").click();
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 54a64b78..337bf502 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -186,9 +186,7 @@ fn command_for(purpose: FilePurpose, name: &str, bytes: &[u8]) -> Result<&'stati
         FilePurpose::Picture => Some("insert.picture"),
         FilePurpose::Audio => Some("insert.audio"),
         FilePurpose::Video => Some("insert.video"),
-        FilePurpose::ChangePicture => {
-            deckcraft_engine::cmd::insert::content_type(name, bytes).starts_with("image/").then_some("picture.change")
-        }
+        FilePurpose::ChangePicture => deckcraft_engine::cmd::insert::content_type(name, bytes).starts_with("image/").then_some("picture.change"),
         FilePurpose::Open => open_command(name),
         FilePurpose::Infer => infer_command(name, bytes),
     };
@@ -2686,7 +2684,7 @@ mod tests {
         harness.state_mut().run("app.dialog", json!({"id": "language"})).unwrap();
         // The anchored window settles over its first frames; click once it stays put.
         harness.run_steps(4);
-        harness.get_by_label("Français").click();
+        harness.get_by_label("Français (France)").click();
         harness.run_steps(2);
         harness.get_by_label("OK").click();
         harness.run_steps(2);
diff --git a/docs/control-protocol.md b/docs/control-protocol.md
index e700b454..b7b6f013 100644
--- a/docs/control-protocol.md
+++ b/docs/control-protocol.md
@@ -27,6 +27,8 @@ Coordinates are slide points (1/72 inch; a 16:9 slide is 960 × 540) unless note
 | `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show: digits then Enter go to that slide, G is See All Slides, Z arms zoom, T pauses the presenter timer, R resets it, `[` and `]` change notes size, Esc clears a slide number, the grid and zoom before it leaves the show) |
 | `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse |
 | `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show; Escape stops the canvas animation preview) |
+| `ui.pointer` | `{events: [{kind: down\|drag\|up\|move\|doubleclick\|tripleclick, x, y, mods?, pressure?}], mods?}` | Drive the active tool in slide points through the same code path as the mouse. `pressure` is `0..=1` for a pen; omit it for a mouse |
+| `ui.key` / `ui.text` | `{key, shift?, alt?, cmd?}` / `{text}` | Keyboard input (also drives a running slide show) |
 | `ui.ime` | `{preedit, active?: [start, end]}` / `{commit}` | An input method's composition through egui, as a real one arrives: shown in place on the slide or in a focused field; `{"preedit": ""}` cancels |
 | `ui.move` / `ui.click` / `ui.drag` | screen points | Real egui pointer input — reaches every widget, menu and pane |
 | `ui.set` | `{tab?, view?, pane?, notes?, zoom?, brightness?, ruler?, gridlines?, guides?, …}` | UI state (returns the full state) |
diff --git a/docs/gaps.md b/docs/gaps.md
index d495f9a6..5b329773 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -33,6 +33,7 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Paragraph dialog; previous: minor, Font dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options dialog; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt adjust handles drag; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (pen pressure scales ink width; tilt, pinch and trackpad gestures remain; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -396,7 +397,6 @@ Detail in [ui-parity.md](ui-parity.md).
   Insert Object…). Size and Position, Bullets and Numbering, Action Settings and Date and Time are in.
   Format Background picture options (transparency, tile, offset, scale, alignment, mirror, and Apply
   to All copying a picture) are pane controls on `design.background`, not another dialog. 8–14 h.
-  Insert Object…). Size and Position, Bullets and Numbering, Action Settings and Date and Time are in. 8–14 h.
 - **Dialogs**: 28 dialogs vs PowerPoint's ~60. The Font dialog is in (family, size, style, underline,
   colour, strikethrough, baseline, caps, character spacing, one undo step). Still missing: Bullets
   and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object…. 6–12 h.
@@ -419,6 +419,7 @@ Detail in [hardware-parity.md](hardware-parity.md).
 - **No pen pressure or tilt for ink**; no pinch-zoom (it does not keep the point under the pointer). A two-finger twist does rotate the selected shapes. 3–6 h.
 - **No pen pressure or tilt for ink**; no pinch-zoom. A trackpad swipe turns the page when the
   slide fits the window, and during the show. 2–4 h for pinch-zoom.
+- **Pen pressure scales ink width** when the pointer reports it (a mouse or a missing reading stays at the pen width; a stroke saved as a flat `0.5` still draws at the pen width). Tilt is not read. No pinch-zoom or other trackpad gestures. 2–4 h.
 
 ## Localization
 
@@ -512,6 +513,7 @@ Detail in [localization-parity.md](localization-parity.md).
 | 2026-10-14 | minor | Font dialog sets typeface, size, style, underline, colour, strikethrough, baseline, caps and character spacing in one step |
 | 2026-10-13 | minor | Grid Options dialog sets spacing, snap and whether gridlines and guides show; the on-screen grid follows that spacing |
 | 2026-10-13 | minor | WordArt adjust handles: a selected text warp shows one yellow handle per adjust, and dragging it sets that guide value (gallery and command still open) |
+| 2026-10-14 | minor | Pen pressure scales ink width when the pointer reports it; tilt, pinch-zoom and other trackpad gestures remain |
 | 2026-10-13 | minor | Shape, picture and table rendering checked against PowerPoint on ~150 synthetic edge-case slides; 3-D bevels, cameras and face lighting now render approximately (gap narrowed to extrusion, rigs and the 3-D pane) |
 | 2026-10-13 | minor | Interactive decks: triggers, return-to-slide state and click rules landed in the slide show; the remaining pieces are one new entry under Features |
 | 2026-10-12 | minor | IME composition in slide text and notes, and CJK interface text with real glyphs (#101): the IME gap is now Korean on the web and table-cell underlines |
diff --git a/docs/hardware-parity.md b/docs/hardware-parity.md
index 27f180f7..c803da55 100644
--- a/docs/hardware-parity.md
+++ b/docs/hardware-parity.md
@@ -3,6 +3,7 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (PNG and JPEG slide export record 144 dpi at the default 2 pixels per point; previous: IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a two-finger twist rotates the selection; previous: minor, IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a trackpad swipe turns the page; pinch-zoom remains; previous: minor, IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (pen pressure scales ink width; tilt remains; previous: minor, IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 
 What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
 ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -50,6 +51,8 @@ because it mostly follows from hardware use.
 | Pinch to zoom | yes | no |
 | Two-finger swipe between slides | yes | yes: when the slide fits the window, and during the show. A zoomed slide still pans |
 | Pen pressure and tilt for ink (Apple Pencil via Sidecar, Windows Ink) | yes | no: ink strokes have constant width |
+| Pinch to zoom, two-finger gestures | yes | no |
+| Pen pressure and tilt for ink (Apple Pencil via Sidecar, Windows Ink) | yes | pressure scales the stroke when the pointer reports it (a mouse or a missing reading draws at the pen width); tilt is not read |
 | Touch screens (Windows) | yes | basic pointer only |
 | IME input methods for CJK text | yes | yes: composed in place, underlined, candidate window at the caret (#101) |
 | Dictation | yes (macOS) | no |
@@ -68,9 +71,9 @@ outlines every frame (#67, fix open), and the decoders run in software.
 | GPU slide rasterization (vello's GPU/hybrid path) | 12–20 |
 | Hardware video decode (copy FilmCraft's VideoToolbox / Media Foundation / VA-API paths) | 8–14 |
 | Windows GPU startup robustness: backend probing, software fallback (#40, #59) | 4–8 (counted under Stability) |
-| Pen pressure, pinch zoom | 3–6 |
+| Pen tilt, pinch zoom, trackpad gestures | 2–5 |
 | Benchmark suite (`cargo xtask bench`) and a first performance pass | 6–12 (Performance dimension) |
-| **Hardware total** | **~26–45** |
+| **Hardware total** | **~25–44** |
 
 ## Revision history
 
@@ -80,5 +83,6 @@ outlines every frame (#67, fix open), and the decoders run in software.
 | 2026-10-13 | trivial | Editor slide rasters sit on the physical pixel grid (#184) |
 | 2026-10-14 | minor | A two-finger twist on the trackpad rotates the selected shapes, as one undo step. Pinch-zoom is unchanged |
 | 2026-10-14 | minor | A sideways trackpad swipe turns the page in Normal view (when the slide fits) and in the show. Pinch-zoom is unchanged |
+| 2026-10-14 | minor | Pen pressure scales ink width; tilt, pinch zoom and trackpad gestures remain (estimate 3–6 h → 2–5 h) |
 | 2026-10-12 | minor | IME input methods (#101) |
 | 2026-10-10 | major | Created: rendering, media, displays, input and performance against PowerPoint 16.113 |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 74d26971..d3497c6f 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -1,7 +1,6 @@
 # PowerPoint feature checklist
 
-> **Generated:** 2026-10-11 (summary by `cargo xtask parity`; rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4; video/animated GIF row re-scored 2026-10-11, #171) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Generated:** 2026-10-13 (summary by `cargo xtask parity`; Preview in editor re-scored; earlier rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Generated:** 2026-10-13 (summary by `cargo xtask parity`; Preview in editor re-scored; earlier rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4; video/animated GIF row re-scored 2026-10-11, #171) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
 **Weighted breadth parity: 82%** over 193 features.
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 71e7996f..7485dd08 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -19,6 +19,7 @@
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (canvas animation preview; beta item 9 keeps the timeline; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options; previous: core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (M9 text warps: adjust handles drag; gallery and command remain) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (after beta: pen pressure scales ink width, tilt remains; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -102,6 +103,10 @@ Handout masters, edit points, text warp and 3-D, proofing dictionaries, Zoom, re
 GIF export, legacy `.ppt` import and `.odp` (owner decision), GPU rasterization and hardware video
 decode, the other 21 languages with RTL mirroring, a larger template gallery (six original starters
 ship), and local AI features (owner decision on models). Itemized with hours in [gaps.md](gaps.md).
+GIF export, legacy `.ppt` import and `.odp` (owner decision), GPU rasterization, hardware video
+decode, pen tilt (pressure already scales ink width) and pinch zoom, the other 21 languages with
+RTL mirroring, a larger original template gallery, and local AI features (owner decision on
+models). Itemized with hours in [gaps.md](gaps.md).
 
 ## Milestones
 
@@ -175,5 +180,6 @@ plan above.
 | 2026-10-13 | trivial | Canvas animation preview landed; beta item 9 keeps the timeline and preview from the selected effect |
 | 2026-10-13 | minor | M10: Grid Options dialog; New Window stays open |
 | 2026-10-13 | minor | M9: WordArt adjust handles drag; the Transform gallery and command stay open |
+| 2026-10-14 | trivial | After beta: pen pressure scales ink width; tilt and pinch zoom remain |
 | 2026-10-10 | minor | Added the alpha gate (six core workflows): all pass, two with partial depth; stage stays alpha |
 | 2026-10-10 | major | Created: current focus, ranked beta plan with hours, milestones M0–M14 with status, the old alpha checklist as history |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 3cdedcc7..1bcff00a 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -23,6 +23,7 @@
 > **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (229 commands; previous: trivial, 227 commands; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Views: Grid Options landed; New Window remains; previous: hours to ~95% per audience added; ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 > **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (text-warp shortfall is the gallery and command; adjust handles drag) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (pen pressure scales ink; percentages unchanged; previous: minor, hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -92,7 +93,7 @@ The weights are what those users actually depend on, written down so the total c
 | UI/UX fidelity | 15% | ~60% | 30–50 | [ui-parity.md](ui-parity.md) | All 10 ribbon tabs and the contextual tabs exist; Format Shape pane, Animation Pane, dialogs and menus are thinner than PowerPoint's; no native macOS menu bar; user reports #17, #71, #73, #76 |
 | Stability | 10% | ~60% | 10–20 | [gaps.md](gaps.md) | Never-crash rules, a panic guard round every command, PPTX fuzz/malformed tests. But startup crashes on some Windows GPUs (#40, #59) and Close discards edits without asking (#60) |
 | Performance | 5% | ~55% | 10–20 | [hardware-parity.md](hardware-parity.md) | Unmeasured against PowerPoint. Slides rasterize on the CPU (`vello_cpu`); Morph re-aligns outlines every frame (#67) |
-| Hardware | 5% | ~40% | 25–45 | [hardware-parity.md](hardware-parity.md) | GPU-composited window (wgpu), but CPU slide raster, software-only video decode, presenter view not placed on the second display, no pen pressure, no pinch zoom |
+| Hardware | 5% | ~40% | 25–45 | [hardware-parity.md](hardware-parity.md) | GPU-composited window (wgpu), but CPU slide raster, software-only video decode, presenter view not placed on the second display, no pen tilt, no pinch zoom |
 | Platforms | 5% | ~80% | 5–10 | [ROADMAP.md](../ROADMAP.md) | Ahead in reach: macOS, Windows x64/x86/arm64, Linux (5 formats), FreeBSD and the web, all from one release workflow. Held back by the Windows GPU crashes and Linux/Windows clipboard gaps |
 | Localization | 5% | ~8% | 55–90 + native review | [localization-parity.md](localization-parity.md) | English only; no string catalog. PowerPoint for Mac ships 26 languages. Bidi and Arabic shaping in slide text exist |
 | Ecosystem (templates, add-ins) | 3% | ~25% | 10–20 | [gaps.md](gaps.md) | 8 original themes and 6 original starter decks; PowerPoint's large template gallery remains; no add-ins or VBA (out of scope by policy) |
@@ -227,7 +228,7 @@ it is the Features row of the dimension table. Automation and Platforms are scor
 | Animations | 6 | 85% | ~65% | 10–16 | 64 of PowerPoint's ~190 effects, Animation Pane timeline, preview from the selected effect, rewind lost on save (#77) | [animation-parity.md](animation-parity.md) |
 | Slide show and presenter view | 8 | 66% | ~60% | 10–16 | Second-display placement, laser pointer, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
 | Review | 3 | 60% | ~45% | 8–14 | Modern comment threads on round trip (#70), compare, version history, real spelling dictionaries | [file-format-parity.md](file-format-parity.md) |
-| Draw (ink) | 2 | 33% | ~30% | 5–9 | Pen pressure, ink to shape/text/math, lasso | [hardware-parity.md](hardware-parity.md) |
+| Draw (ink) | 2 | 33% | ~30% | 5–9 | Pen tilt, ink to shape/text/math, lasso | [hardware-parity.md](hardware-parity.md) |
 | Undo and clipboard | 3 | 88% | ~75% | 3–5 | Paste Special, image paste (#53) | [ui-parity.md](ui-parity.md) |
 | Automation ✱ | — | 100% | ahead | 0 | | [mcp.md](mcp.md) |
 | Platforms ✱ | — | 67% | ~80% | see platforms | | [ROADMAP.md](../ROADMAP.md) |
@@ -362,6 +363,7 @@ scored done (16 open issues).
 | 2026-10-14 | trivial | Command count 226 → 227 (Font dialog). Breadth and ready percentages unchanged |
 | 2026-10-13 | minor | Views: Grid Options dialog landed (spacing, snap, display). Remaining in that row: New Window. Percentages unchanged |
 | 2026-10-13 | minor | Shapes shortfall "text warp" narrowed: yellow adjust handles drag; the gallery and command remain |
+| 2026-10-14 | trivial | Draw and hardware blurbs: pen pressure scales ink width when reported; percentages and hour ranges unchanged |
 | 2026-10-10 | minor | Added the readiness-by-audience table: each number gets its own hours to ~95% (full 340–600, mainstream 150–250, essentials 50–90). The full number stays an additive weighted sum; no change to the percentages |
 | 2026-10-10 | minor | Added the mainstream practitioner (~53%) and essentials user (~62%) numbers with written weights, discounts and user evidence. Features dimension recomputed from written area weights (66% judgement → 62.4% weighted mean), which moves ready for real work from ~56% to ~55%; stage unchanged |
 | 2026-10-10 | minor | Stage checked against the core-workflow gate (all six pass); stays alpha |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index 098a12c2..0bd84709 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -99,7 +99,6 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, shadow/glow/reflection details (colour, transparency, blur, angle, distance, size), soft edges, size; no 3-D, thin picture/texture options |
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill (solid transparency follows the selection), gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, picture/texture fill (source, tile, offsets, scale, alignment, mirror, transparency, rotate with shape), line, some effects, size; no 3-D |
-| Format Background pane | yes | yes |
 | Slide Master | Insert Layout, Rename, Delete, Preserve, Insert Placeholder, Title and Footers | Insert Layout, Rename, Delete, Insert Placeholder, and Preserve, Title and Footers checkboxes (`master.preserve`, `master.placeholders`). A master thumbnail selects the master |
 | Format Background pane | yes | yes: solid transparency; picture transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture. Stretch insets and rotate-with-shape are command parameters |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |

From 0dfc9ccf6fcdba2ffadf3a2f2e99603db90a510e Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:27:46 -0400
Subject: [PATCH 362/376] Fix up #247: route main's other file access through
 the checked io layer
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

design.browseTheme reads its path with io::read_file, and File › Info sizes the file with
io::file_len (which checks the read root), so commands_do_not_touch_the_file_system_themselves
passes. spell.rs is allow-listed beside recovery.rs: it touches only the app's own dictionary
folders. main's render_slide MCP tool refuses a `path` argument (#371), so the root tests
render to a file through call_app ui.render instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/design.rs      |  2 +-
 crates/engine/src/cmd/file.rs        |  2 +-
 crates/engine/src/file_access.rs     |  6 +++++-
 crates/engine/src/io.rs              | 13 +++++++++++++
 crates/mcp/tests/automation_roots.rs |  6 +++---
 5 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/crates/engine/src/cmd/design.rs b/crates/engine/src/cmd/design.rs
index ddae3f58..599e084c 100644
--- a/crates/engine/src/cmd/design.rs
+++ b/crates/engine/src/cmd/design.rs
@@ -152,7 +152,7 @@ fn browse_theme(s: &mut Session, p: &Value) -> Result<Value> {
         #[cfg(not(target_arch = "wasm32"))]
         {
             let path = str_param(p, "path").ok_or_else(|| bad("design.browseTheme", "give `path` or `data`"))?;
-            std::fs::read(path).map_err(|e| crate::EngineError::Other(format!("{path}: {e}")))?
+            crate::io::read_file(path).map_err(crate::EngineError::Other)?
         }
         #[cfg(target_arch = "wasm32")]
         return Err(bad("design.browseTheme", "give `data`"));
diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index 8bcb5c5c..4765da60 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -476,7 +476,7 @@ fn info(s: &mut Session, _p: &Value) -> Result<Value> {
     let st = s.doc()?;
     let doc = &st.doc;
     #[cfg(not(target_arch = "wasm32"))]
-    let bytes = st.path.as_ref().and_then(|p| std::fs::metadata(p).ok()).map(|m| m.len());
+    let bytes = st.path.as_deref().and_then(crate::io::file_len);
     #[cfg(target_arch = "wasm32")]
     let bytes: Option<u64> = None;
     Ok(json!({
diff --git a/crates/engine/src/file_access.rs b/crates/engine/src/file_access.rs
index d5ee0a99..bcda8492 100644
--- a/crates/engine/src/file_access.rs
+++ b/crates/engine/src/file_access.rs
@@ -460,7 +460,11 @@ mod tests {
         for path in files {
             let name = path.file_name().and_then(|n| n.to_str()).unwrap_or("");
             // `io` and this module are the checked gateway; `tests*.rs` are test-only modules.
-            if path.parent() == Some(src.as_path()) && matches!(name, "io.rs" | "file_access.rs" | "recovery.rs") || name.starts_with("tests") {
+            // `recovery` and `spell` touch only the app's own folders (AutoRecover files, the
+            // system and user spelling dictionaries), never a path a command names.
+            if path.parent() == Some(src.as_path()) && matches!(name, "io.rs" | "file_access.rs" | "recovery.rs" | "spell.rs")
+                || name.starts_with("tests")
+            {
                 continue;
             }
             let text = std::fs::read_to_string(&path).unwrap();
diff --git a/crates/engine/src/io.rs b/crates/engine/src/io.rs
index 0ae00c3e..aaba8d42 100644
--- a/crates/engine/src/io.rs
+++ b/crates/engine/src/io.rs
@@ -33,3 +33,16 @@ pub fn write_file(path: &str, bytes: &[u8]) -> Result<(), String> {
 pub fn write_file(path: &str, _bytes: &[u8]) -> Result<(), String> {
     Err(format!("{path}: saving to a path is not available in the browser"))
 }
+
+/// The size in bytes of the file at `path`; `None` when it can't be read (or is outside the
+/// automation read root, so File › Info doesn't reveal files the agent may not read).
+#[cfg(not(target_arch = "wasm32"))]
+pub fn file_len(path: &str) -> Option<u64> {
+    crate::file_access::check_read(path).ok()?;
+    std::fs::metadata(path).ok().map(|m| m.len())
+}
+
+#[cfg(target_arch = "wasm32")]
+pub fn file_len(_path: &str) -> Option<u64> {
+    None
+}
diff --git a/crates/mcp/tests/automation_roots.rs b/crates/mcp/tests/automation_roots.rs
index f8595ff9..356c3704 100644
--- a/crates/mcp/tests/automation_roots.rs
+++ b/crates/mcp/tests/automation_roots.rs
@@ -134,7 +134,7 @@ fn every_writing_command_is_refused_outside_the_write_root() {
     refused(&mut server, "export", json!({"path": outside("x.png")}), "outside the write root");
     refused(&mut server, "export", json!({"path": outside("x.txt")}), "outside the write root");
     refused(&mut server, "export", json!({"path": outside("all.png"), "all": true}), "outside the write root");
-    refused(&mut server, "render_slide", json!({"path": outside("r.png")}), "outside the write root");
+    refused(&mut server, "call_app", json!({"method": "ui.render", "params": {"path": outside("r.png")}}), "outside the write root");
     refused(&mut server, "call_app", json!({"method": "app.save", "params": {"path": outside("y.deckcraft")}}), "outside the write root");
     refused(&mut server, "call_app", json!({"method": "app.export", "params": {"path": outside("y.pdf")}}), "outside the write root");
     for command in ["file.save", "file.saveAs", "file.export"] {
@@ -162,7 +162,7 @@ fn every_writing_command_is_refused_outside_the_write_root() {
     ok(&mut server, "export", json!({"path": inside("x.pptx")}));
     ok(&mut server, "export", json!({"path": inside("x.pdf")}));
     ok(&mut server, "export", json!({"path": inside("all.png"), "all": true}));
-    ok(&mut server, "render_slide", json!({"path": inside("r.png")}));
+    ok(&mut server, "call_app", json!({"method": "ui.render", "params": {"path": inside("r.png")}}));
     for f in ["x.deckcraft", "x.pptx", "x.pdf", "all1.png", "all2.png", "r.png"] {
         assert!(base.join("out").join(f).exists(), "{f}");
     }
@@ -176,7 +176,7 @@ fn one_root_grants_only_its_own_access() {
     ok(&mut read_only, "open_presentation", json!({"path": s(&base.join("in/a.txt"))}));
     refused(&mut read_only, "save_presentation", json!({"path": s(&base.join("out/x.deckcraft"))}), "write authority is absent");
     refused(&mut read_only, "export", json!({"path": s(&base.join("out/x.pdf"))}), "write authority is absent");
-    refused(&mut read_only, "render_slide", json!({"path": s(&base.join("out/r.png"))}), "write authority is absent");
+    refused(&mut read_only, "call_app", json!({"method": "ui.render", "params": {"path": s(&base.join("out/r.png"))}}), "write authority is absent");
     // Calls that return bytes instead of writing a path keep working.
     let (error, _) = call(&mut read_only, "render_slide", json!({"scale": 0.25}));
     assert!(!error);

From 30107bdb316ed93f824b285a25c7a393a8018f49 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:29:48 -0400
Subject: [PATCH 363/376] Fix up #321: drop the empty-body layout_for change
 main's caret_line already covers

The caret's colour (caret_color) is kept and used at main's caret draw site; the
placeholder-prompt hiding is kept too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/text.rs |  9 ---------
 crates/engine/src/tests.rs    | 14 --------------
 2 files changed, 23 deletions(-)

diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index a55b0ed8..23b220c7 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -188,15 +188,6 @@ pub fn layout_for(st: &DocState, t: &TextSel) -> Option<deckcraft_text::TextLayo
     }
     let sh = st.shape(t.shape)?;
     let body = sh.text.as_ref()?;
-    // A body nobody has typed into holds no paragraph. Lay it out as one empty paragraph, so
-    // the caret has a line to stand on.
-    let blank;
-    let body = if body.paragraphs.is_empty() {
-        blank = TextBody { paragraphs: vec![Paragraph::default()], ..body.clone() };
-        &blank
-    } else {
-        body
-    };
     let ctx = ctx_for(&st.doc, &st.selection)?;
     let x = xfrm_of(&st.doc, &st.selection, sh);
     let geo = deckcraft_render::shape_geometry(sh, x.w, x.h);
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index e0aff8a8..1f18d172 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -2495,20 +2495,6 @@ fn language_marks_text_and_no_proof_and_repeats_are_reported() {
     assert!(s.execute("format.language", &json!({"lang": "en US!"})).is_err());
 }
 
-#[test]
-fn an_empty_placeholder_has_a_caret() {
-    let mut s = session();
-    let title = s.doc().unwrap().current_slide().unwrap().shapes[0].id.0;
-    s.execute("text.edit", &json!({"id": title})).unwrap();
-    let st = s.doc().unwrap();
-    let sel = st.selection.text.clone().unwrap();
-    let layout = cmd::text::layout_for(st, &sel).unwrap();
-    let (x, top, bottom) = layout.caret(deckcraft_text::Pos { para: 0, ch: 0 }).expect("a caret in the empty title");
-    // A centred title: the caret stands in the middle of the text box, one line tall.
-    assert!((x - layout.inner.center().x).abs() < 1.0, "{x} in {:?}", layout.inner);
-    assert!(bottom - top > 20.0, "{top}..{bottom}");
-}
-
 #[test]
 fn the_caret_takes_the_colour_of_the_text() {
     let caret = |theme: &str| {

From f403c65c943610e5290c73a56fc3d9a581c13d29 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:30:16 -0400
Subject: [PATCH 364/376] Fix up #355: kept chart parts get fresh names;
 chartex keeps its workbook

A chart's kept parts were written under the names the source file gave them,
so a relationship to ppt/media/image1.png (or any name the writer generates)
produced a second zip entry with that name on save. Kept parts are now written
as ppt/<folder>/keptN.<ext> with a content-type override each, the chart's and
the kept parts' own relationships are rewritten to the new names (relationships
to parts that were not kept are dropped), and the package writer skips any
second entry under a name it already wrote. externalData/userShapes are dropped
only when their relationship is not written back.

Office 2016 chartex charts (added on main since the PR) capture and write back
their kept parts the same way; the plain-chart fallback carries none.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/model/src/chart.rs        |   4 +
 crates/pptx/src/opc.rs           |  61 ++++++----
 crates/pptx/src/read/chart.rs    |   4 +-
 crates/pptx/src/write/chart.rs   | 135 +++++++++++++++++-----
 crates/pptx/src/write/mod.rs     |  12 +-
 crates/pptx/src/write/shapes.rs  |   4 +
 crates/pptx/src/xml.rs           |  13 ---
 crates/pptx/tests/chart_embed.rs | 191 ++++++++++++++++++++++++++++++-
 docs/file-format-parity.md       |   8 +-
 docs/gaps.md                     |   5 +-
 10 files changed, 360 insertions(+), 77 deletions(-)

diff --git a/crates/model/src/chart.rs b/crates/model/src/chart.rs
index fbca876f..36dd9708 100644
--- a/crates/model/src/chart.rs
+++ b/crates/model/src/chart.rs
@@ -404,6 +404,10 @@ pub struct ChartRel {
     pub id: String,
     pub rel_type: String,
     pub target: String,
+    /// Absolute name of the part an internal relationship reaches (matches a `ChartPart::name`
+    /// up to case); empty for external ones. The writer renames kept parts and uses this to
+    /// point the relationship at the new name.
+    pub part: String,
     pub external: bool,
 }
 
diff --git a/crates/pptx/src/opc.rs b/crates/pptx/src/opc.rs
index 0e7c5e64..0e7f86fe 100644
--- a/crates/pptx/src/opc.rs
+++ b/crates/pptx/src/opc.rs
@@ -127,23 +127,7 @@ impl Package {
     pub fn rels(&self, part: &str) -> Rels {
         let rp = rels_path(part);
         let Some(doc) = self.xml(&rp) else { return Rels::default() };
-        let base = dir_of(part);
-        let mut out = Rels::default();
-        for r in doc.root.children_named("Relationship") {
-            let (Some(id), Some(ty), Some(target)) = (r.attr("Id"), r.attr("Type"), r.attr("Target")) else { continue };
-            let external = r.attr("TargetMode").is_some_and(|m| m.eq_ignore_ascii_case("external"));
-            let target_raw = target.to_string();
-            let target = if external { target_raw.clone() } else { resolve(&base, target) };
-            out.items.push(Rel {
-                id: id.to_string(),
-                kind: ty.rsplit('/').next().unwrap_or(ty).to_string(),
-                ty: ty.to_string(),
-                target_raw,
-                target,
-                external,
-            });
-        }
-        out
+        rels_of(&doc, part)
     }
     /// Content types: (extension defaults, part overrides).
     pub fn content_type(&self, part: &str) -> Option<String> {
@@ -165,6 +149,38 @@ impl Package {
     }
 }
 
+/// The relationships in a parsed rels part, with internal targets resolved against `part`'s folder.
+fn rels_of(doc: &xml::Doc, part: &str) -> Rels {
+    let base = dir_of(part);
+    let mut out = Rels::default();
+    for r in doc.root.children_named("Relationship") {
+        let (Some(id), Some(ty), Some(target)) = (r.attr("Id"), r.attr("Type"), r.attr("Target")) else { continue };
+        let external = r.attr("TargetMode").is_some_and(|m| m.eq_ignore_ascii_case("external"));
+        let target_raw = target.to_string();
+        let target = if external { target_raw.clone() } else { resolve(&base, target) };
+        out.items.push(Rel {
+            id: id.to_string(),
+            kind: ty.rsplit('/').next().unwrap_or(ty).to_string(),
+            ty: ty.to_string(),
+            target_raw,
+            target,
+            external,
+        });
+    }
+    out
+}
+
+/// The relationships of `part` from the bytes of its rels part (kept parts carried by a chart).
+pub fn rels_from_bytes(bytes: &[u8], part: &str) -> Rels {
+    match xml::parse(bytes) {
+        Ok(doc) => rels_of(&doc, part),
+        Err(e) => {
+            log::warn!("pptx: relationships of {part}: {e}");
+            Rels::default()
+        }
+    }
+}
+
 #[derive(Clone, Debug, Default)]
 pub struct Rel {
     pub id: String,
@@ -377,10 +393,6 @@ impl PackageOut {
     pub fn raw(&mut self, name: &str, data: Vec<u8>) {
         self.files.push((name.to_string(), data, true));
     }
-    pub fn part_data(&self, name: &str) -> Option<&[u8]> {
-        let n = norm(name);
-        self.files.iter().find(|(f, _, _)| norm(f) == n).map(|(_, d, _)| d.as_slice())
-    }
     /// Add a binary part; its extension gets a Default content type.
     pub fn binary(&mut self, name: &str, content_type: &str, data: Vec<u8>) {
         let ext = name.rsplit('.').next().unwrap_or("bin").to_ascii_lowercase();
@@ -407,7 +419,14 @@ impl PackageOut {
         let err = |e: &dyn std::fmt::Display| PptxError::Write(e.to_string());
         zw.start_file("[Content_Types].xml", deflate).map_err(|e| err(&e))?;
         zw.write_all(&ct.finish()).map_err(|e| err(&e))?;
+        let mut written = std::collections::HashSet::new();
         for (name, data, compress) in &self.files {
+            // Zip entry names must be unique: a second part under a name already written is
+            // dropped rather than producing a package readers reject or resolve differently.
+            if !written.insert(norm(name)) {
+                log::warn!("pptx: part {name} written twice; keeping the first");
+                continue;
+            }
             let large = data.len() as u64 >= u32::MAX as u64 / 2;
             let opts = if *compress { deflate } else { stored }.large_file(large);
             zw.start_file(name.as_str(), opts).map_err(|e| err(&e))?;
diff --git a/crates/pptx/src/read/chart.rs b/crates/pptx/src/read/chart.rs
index bda93537..9fef9984 100644
--- a/crates/pptx/src/read/chart.rs
+++ b/crates/pptx/src/read/chart.rs
@@ -421,11 +421,11 @@ pub(crate) fn capture_kept(pkg: &crate::opc::Package, chart_part: &str) -> deckc
             continue;
         }
         if r.external {
-            kept.rels.push(ChartRel { id: r.id, rel_type: r.ty, target: r.target_raw, external: true });
+            kept.rels.push(ChartRel { id: r.id, rel_type: r.ty, target: r.target_raw, part: String::new(), external: true });
             continue;
         }
         if copy_part(pkg, &r.target, &mut kept.parts, &mut seen, 0) {
-            kept.rels.push(ChartRel { id: r.id, rel_type: r.ty, target: r.target_raw, external: false });
+            kept.rels.push(ChartRel { id: r.id, rel_type: r.ty, target: r.target_raw, part: r.target, external: false });
         }
     }
     kept
diff --git a/crates/pptx/src/write/chart.rs b/crates/pptx/src/write/chart.rs
index 38b16099..88917450 100644
--- a/crates/pptx/src/write/chart.rs
+++ b/crates/pptx/src/write/chart.rs
@@ -512,10 +512,15 @@ fn plot_group(w: &mut W, c: &Chart, kind: ChartType, list: &[(usize, &Series)])
 }
 
 /// The `chartEx` part of an Office 2016 chart (waterfall, funnel…): the kept part when the chart
-/// is unchanged since it was read (without its workbook link), else one written from the model.
-/// `None` for other chart types.
+/// is unchanged since it was read, else one written from the model. `None` for other chart types.
+#[cfg(test)]
 pub fn chartex_xml(c: &Chart) -> Option<Vec<u8>> {
-    kept_chartex(c).or_else(|| c.kind.is_chartex().then(|| build_chartex(c)))
+    chartex_part(c).map(|(x, _)| x)
+}
+
+/// [`chartex_xml`], and whether it is the original part (so its kept relationships still apply).
+pub fn chartex_part(c: &Chart) -> Option<(Vec<u8>, bool)> {
+    kept_chartex(c).map(|x| (x, true)).or_else(|| c.kind.is_chartex().then(|| (build_chartex(c), false)))
 }
 
 fn kept_chartex(c: &Chart) -> Option<Vec<u8>> {
@@ -525,11 +530,14 @@ fn kept_chartex(c: &Chart) -> Option<Vec<u8>> {
     crate::read::resolve_mc(&mut root, 0);
     let mut back = crate::read::chartex_from(&root)?;
     back.raw = c.raw.clone();
+    // The sidecar is not modelled chart state.
+    back.kept = c.kept.clone();
     if &back != c {
         return None;
     }
     let mut keep = doc.root;
-    keep.remove_all(&["externalData"]);
+    // The workbook link stays only when its part is written back.
+    drop_unkept_refs(&mut keep, c);
     let mut w = W::new();
     w.raw(&keep.to_xml());
     Some(w.finish())
@@ -553,9 +561,7 @@ pub fn chart_xml(c: &Chart) -> (Vec<u8>, bool) {
             if back == me {
                 let mut keep = doc.root;
                 // Without the parts those elements point at, PowerPoint repairs the file.
-                if c.kept.rels.is_empty() {
-                    keep.remove_all(&["externalData", "userShapes"]);
-                }
+                drop_unkept_refs(&mut keep, c);
                 let mut w = W::new();
                 w.raw(&keep.to_xml());
                 return (w.finish(), true);
@@ -660,31 +666,106 @@ pub fn chart_xml(c: &Chart) -> (Vec<u8>, bool) {
     (w.finish(), false)
 }
 
-/// Write the chart's own relationships and the parts they reach.
-pub fn write_kept(pkg: &mut crate::opc::PackageOut, chart_name: &str, c: &Chart) {
-    if c.kept.rels.is_empty() && c.kept.parts.is_empty() {
+/// The relationship ids of an unchanged chart that [`write_kept`] writes back: external ones, and
+/// internal ones whose part was kept.
+fn kept_rel_ids(c: &Chart) -> std::collections::HashSet<&str> {
+    let parts: std::collections::HashSet<String> = c.kept.parts.iter().filter(|p| kept_payload(&p.name)).map(|p| crate::opc::norm(&p.name)).collect();
+    c.kept.rels.iter().filter(|r| r.external || parts.contains(&crate::opc::norm(&r.part))).map(|r| r.id.as_str()).collect()
+}
+
+/// A kept part that is written as a part of its own (rels parts are rewritten instead).
+fn kept_payload(name: &str) -> bool {
+    !name.to_ascii_lowercase().ends_with(".rels") && crate::opc::sidecar_part(name)
+}
+
+/// Drop `c:externalData` / `c:userShapes` (and the `cx:` ones) that point at a relationship that
+/// is not written back: without the part PowerPoint repairs the file.
+fn drop_unkept_refs(root: &mut crate::xml::El, c: &Chart) {
+    let ids = kept_rel_ids(c);
+    fn rec(e: &mut crate::xml::El, ids: &std::collections::HashSet<&str>, depth: usize) {
+        if depth > crate::xml::MAX_DEPTH {
+            return;
+        }
+        e.children.retain(|n| match n {
+            crate::xml::Node::El(x) if x.is("externalData") || x.is("userShapes") => x.attr("r:id").is_some_and(|id| ids.contains(id)),
+            _ => true,
+        });
+        for ch in e.elements_mut() {
+            rec(ch, ids, depth + 1);
+        }
+    }
+    rec(root, &ids, 0);
+}
+
+/// A fresh name for a kept part: `ppt/<folder>/keptN.<ext>`. The writer generates no `kept…`
+/// names and `n` is unique within the package, so a kept part never lands on (or duplicates) a
+/// part the writer makes, whatever the source file called it.
+fn kept_name(original: &str, n: u32) -> String {
+    let norm = crate::opc::norm(original);
+    let area = norm.split('/').nth(1).unwrap_or("embeddings");
+    let area = if matches!(area, "embeddings" | "charts" | "drawings" | "media") { area } else { "embeddings" };
+    let file = crate::opc::file_of(&norm);
+    let ext = file
+        .rsplit_once('.')
+        .map(|(_, e)| e)
+        .filter(|e| !e.is_empty() && e.len() <= 8 && e.chars().all(|c| c.is_ascii_alphanumeric()))
+        .unwrap_or("bin");
+    format!("ppt/{area}/kept{n}.{ext}")
+}
+
+/// Write an unchanged chart's own relationships and the parts they reach. Each kept part is
+/// written under a fresh name ([`kept_name`]) and the relationships between kept parts are
+/// rewritten to those names; a relationship to anything that was not kept is dropped.
+/// `n_kept` numbers kept parts across the package.
+pub fn write_kept(pkg: &mut crate::opc::PackageOut, chart_name: &str, c: &Chart, n_kept: &mut u32) {
+    use std::collections::HashMap;
+
+    use crate::opc::{RelsOut, norm, relative, rels_path};
+
+    if c.kept.rels.is_empty() {
         return;
     }
-    let mut rels = crate::opc::RelsOut::default();
-    for r in &c.kept.rels {
-        rels.items.push((r.id.clone(), r.rel_type.clone(), r.target.clone(), r.external));
-    }
-    pkg.rels(chart_name, &rels);
-    for p in &c.kept.parts {
-        match pkg.part_data(&p.name) {
-            Some(existing) if existing != p.bytes.as_slice() => {
-                log::warn!("pptx: chart part {} already written with different bytes; keeping the first", p.name);
-                continue;
-            }
-            Some(_) => continue,
-            None => {}
-        }
-        if !crate::opc::sidecar_part(&p.name) {
-            log::warn!("pptx: not writing chart part {}", p.name);
+    // Original part name (normalized) → the name written.
+    let mut names: HashMap<String, String> = HashMap::new();
+    for p in c.kept.parts.iter().filter(|p| kept_payload(&p.name)) {
+        let key = norm(&p.name);
+        if names.contains_key(&key) {
             continue;
         }
+        *n_kept += 1;
+        let new = kept_name(&p.name, *n_kept);
         let ct = if !p.content_type.is_empty() { p.content_type.clone() } else { crate::mime_for(&p.name).to_string() };
-        pkg.binary(&p.name, &ct, p.bytes.clone());
+        // An override per part: a kept part never sets the package-wide default for its extension.
+        pkg.xml_part(&new, &ct, p.bytes.clone());
+        names.insert(key, new);
+    }
+    let mut rels = RelsOut::default();
+    for r in &c.kept.rels {
+        if r.external {
+            rels.items.push((r.id.clone(), r.rel_type.clone(), r.target.clone(), true));
+        } else if let Some(new) = names.get(&norm(&r.part)) {
+            rels.items.push((r.id.clone(), r.rel_type.clone(), relative(chart_name, new), false));
+        } else {
+            log::warn!("pptx: chart relationship {} has no kept part; dropped", r.id);
+        }
+    }
+    pkg.rels(chart_name, &rels);
+    // The kept parts' own relationships, pointed at the new names.
+    for p in c.kept.parts.iter().filter(|p| kept_payload(&p.name)) {
+        let Some(new_source) = names.get(&norm(&p.name)) else { continue };
+        let rp = norm(&rels_path(&p.name));
+        let Some(rels_part) = c.kept.parts.iter().find(|q| norm(&q.name) == rp) else { continue };
+        let mut out = RelsOut::default();
+        for r in crate::opc::rels_from_bytes(&rels_part.bytes, &p.name).items {
+            if r.external {
+                out.items.push((r.id, r.ty, r.target_raw, true));
+            } else if let Some(new) = names.get(&norm(&r.target)) {
+                out.items.push((r.id, r.ty, relative(new_source, new), false));
+            } else {
+                log::warn!("pptx: relationship {} of kept chart part {} has no kept target; dropped", r.id, p.name);
+            }
+        }
+        pkg.rels(new_source, &out);
     }
 }
 
diff --git a/crates/pptx/src/write/mod.rs b/crates/pptx/src/write/mod.rs
index 6e895a3d..dd222d3b 100644
--- a/crates/pptx/src/write/mod.rs
+++ b/crates/pptx/src/write/mod.rs
@@ -59,6 +59,8 @@ pub struct Exp<'a> {
     n_diagram: u32,
     n_tags: u32,
     n_chartex: u32,
+    /// Parts kept from an unchanged chart (`ppt/…/keptN.ext`).
+    n_kept: u32,
     pub slide_parts: HashMap<SlideId, String>,
     pub table_styles: Vec<String>,
     placeholder: Option<String>,
@@ -195,10 +197,15 @@ impl Exp<'_> {
     }
     /// An unchanged Office 2016 chart's `chartEx` part and its relationship id.
     pub fn chartex_rel(&mut self, o: &mut Out, c: &deckcraft_model::Chart) -> Option<String> {
-        let xml = chart::chartex_xml(c)?;
+        let (xml, preserved) = chart::chartex_part(c)?;
         self.n_chartex += 1;
         let name = format!("ppt/charts/chartEx{}.xml", self.n_chartex);
         self.pkg.xml_part(&name, CT_CHARTEX, xml);
+        if preserved {
+            chart::write_kept(&mut self.pkg, &name, c, &mut self.n_kept);
+        } else if !c.kept.parts.is_empty() {
+            log::warn!("pptx: chart data changed; the embedded workbook was not written back");
+        }
         Some(o.rels.add_new(RT_CHARTEX, &opc::relative(&o.name, &name), false))
     }
 
@@ -208,7 +215,7 @@ impl Exp<'_> {
         let (xml, preserved) = chart::chart_xml(c);
         self.pkg.xml_part(&name, CT_CHART, xml);
         if preserved {
-            chart::write_kept(&mut self.pkg, &name, c);
+            chart::write_kept(&mut self.pkg, &name, c, &mut self.n_kept);
         } else if !c.kept.parts.is_empty() {
             log::warn!("pptx: chart data changed; the embedded workbook was not written back");
         }
@@ -528,6 +535,7 @@ pub fn export(p: &Presentation, main_ct: &str) -> Result<Vec<u8>, PptxError> {
         n_diagram: 0,
         n_tags: 0,
         n_chartex: 0,
+        n_kept: 0,
         slide_parts: HashMap::new(),
         table_styles: vec![],
         placeholder: None,
diff --git a/crates/pptx/src/write/shapes.rs b/crates/pptx/src/write/shapes.rs
index 770ee775..aff238b7 100644
--- a/crates/pptx/src/write/shapes.rs
+++ b/crates/pptx/src/write/shapes.rs
@@ -401,6 +401,10 @@ pub fn shape(w: &mut W, x: &mut Exp, o: &mut Out, cx: &mut Ctx, s: &Shape, depth
             }
             let mut plain = (**c).clone();
             plain.raw = plain.raw.filter(|r| !r.contains(super::chart::NS_CX));
+            if ex.is_some() {
+                // The kept workbook belongs to the `chartEx` part; the fallback has none.
+                plain.kept = Default::default();
+            }
             let rid = x.chart_rel(o, &plain);
             frame_open(w, x, o, id, s);
             w.open("a:graphicData", A::new().a("uri", "http://schemas.openxmlformats.org/drawingml/2006/chart"));
diff --git a/crates/pptx/src/xml.rs b/crates/pptx/src/xml.rs
index eceb0708..9484863a 100644
--- a/crates/pptx/src/xml.rs
+++ b/crates/pptx/src/xml.rs
@@ -171,19 +171,6 @@ impl El {
         write_el(self, &mut s, 0);
         s
     }
-    /// Remove descendant elements with any of these local names (bounded).
-    pub fn remove_all(&mut self, locals: &[&str]) {
-        fn rec(e: &mut El, locals: &[&str], depth: usize) {
-            if depth > MAX_DEPTH {
-                return;
-            }
-            e.children.retain(|c| !matches!(c, Node::El(x) if locals.contains(&x.local())));
-            for c in e.elements_mut() {
-                rec(c, locals, depth + 1);
-            }
-        }
-        rec(self, locals, 0)
-    }
 }
 
 fn write_el(e: &El, s: &mut String, depth: usize) {
diff --git a/crates/pptx/tests/chart_embed.rs b/crates/pptx/tests/chart_embed.rs
index ddf56731..d80d4d6d 100644
--- a/crates/pptx/tests/chart_embed.rs
+++ b/crates/pptx/tests/chart_embed.rs
@@ -98,14 +98,15 @@ fn an_unchanged_chart_keeps_its_embedded_workbook() {
 
     let saved = deckcraft_pptx::export(&deckcraft_pptx::import(&src).expect("import")).expect("export");
     let saved_parts = parts(&saved);
-    let workbook = saved_parts.iter().find(|(n, _)| n == EMBED).map(|(_, d)| d.as_slice());
+    // Kept parts are written under fresh names, so they can't land on a part the writer makes.
+    let workbook = saved_parts.iter().find(|(n, _)| n == "ppt/embeddings/kept1.xlsx").map(|(_, d)| d.as_slice());
     assert_eq!(workbook, Some(WORKBOOK), "the embedding part is dropped on save");
     let rels = saved_parts
         .iter()
         .find(|(n, _)| n.starts_with("ppt/charts/_rels/chart") && n.ends_with(".xml.rels"))
         .map(|(_, d)| String::from_utf8_lossy(d).into_owned())
         .expect("chart relationships");
-    assert!(rels.contains("../embeddings/Microsoft_Excel_Worksheet1.xlsx"), "{rels}");
+    assert!(rels.contains(r#"Id="rId1""#) && rels.contains("../embeddings/kept1.xlsx"), "{rels}");
     assert!(!rels.contains("slide1.xml"), "a chart relationship must not replace the slide: {rels}");
     let slide = saved_parts.iter().find(|(n, _)| n == "ppt/slides/slide1.xml").map(|(_, d)| String::from_utf8_lossy(d).into_owned()).expect("slide");
     assert!(slide.contains("sld"), "{slide}");
@@ -131,7 +132,7 @@ fn an_edited_chart_does_not_write_a_stale_workbook() {
     let value = chart.series.get_mut(0).and_then(|s| s.values.get_mut(0)).expect("value");
     *value = Some(99.0);
     let saved = parts(&deckcraft_pptx::export(&p).expect("export"));
-    assert!(saved.iter().all(|(n, _)| n != EMBED), "a stale workbook was written after the chart changed");
+    assert!(saved.iter().all(|(n, _)| !n.starts_with("ppt/embeddings/")), "a stale workbook was written after the chart changed");
     let xml = saved
         .iter()
         .find(|(n, _)| n.starts_with("ppt/charts/chart") && n.ends_with(".xml"))
@@ -139,3 +140,187 @@ fn an_edited_chart_does_not_write_a_stale_workbook() {
         .expect("chart xml");
     assert!(!xml.contains("externalData"), "{xml}");
 }
+
+fn png(rgb: [u8; 3]) -> Vec<u8> {
+    let img = image::RgbImage::from_pixel(4, 4, image::Rgb(rgb));
+    let mut out = Cursor::new(vec![]);
+    image::DynamicImage::ImageRgb8(img).write_to(&mut out, image::ImageFormat::Png).expect("png");
+    out.into_inner()
+}
+
+/// Rewrite `src`: `edit` may change any entry (name, bytes → new bytes), then `extra` entries are added.
+fn rewrite(src: &[u8], edit: impl Fn(&str, Vec<u8>) -> Vec<u8>, extra: &[(&str, &[u8])]) -> Vec<u8> {
+    let mut zip = zip::ZipArchive::new(Cursor::new(src)).expect("zip");
+    let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let opts = zip::write::SimpleFileOptions::default();
+    for i in 0..zip.len() {
+        let mut f = zip.by_index(i).expect("entry");
+        let name = f.name().to_string();
+        let mut data = vec![];
+        f.read_to_end(&mut data).expect("read");
+        let data = edit(&name, data);
+        out.start_file(&name, opts).expect("start");
+        out.write_all(&data).expect("write");
+    }
+    for (name, data) in extra {
+        out.start_file(*name, opts).expect("start");
+        out.write_all(data).expect("write");
+    }
+    out.finish().expect("finish").into_inner()
+}
+
+fn unique_names(parts: &[(String, Vec<u8>)]) {
+    let mut seen = std::collections::HashSet::new();
+    for (n, _) in parts {
+        assert!(seen.insert(n.to_ascii_lowercase()), "duplicate zip entry {n}");
+    }
+}
+
+fn text_of(parts: &[(String, Vec<u8>)], name: &str) -> String {
+    parts.iter().find(|(n, _)| n == name).map(|(_, d)| String::from_utf8_lossy(d).into_owned()).unwrap_or_else(|| panic!("no {name}"))
+}
+
+const RT: &str = "http://schemas.openxmlformats.org/officeDocument/2006/relationships";
+
+/// A chart whose relationships reach parts named like the ones the writer generates
+/// (`ppt/media/image1.png`, `ppt/drawings/…`) must not collide with them on save: no duplicate
+/// zip entries, and the slide's own picture keeps its bytes.
+#[test]
+fn kept_chart_parts_never_collide_with_written_parts() {
+    let picture = png([10, 200, 30]);
+    let mut p = defaults::new_presentation(None);
+    p.slides.clear();
+    let img = p.add_media("image1.png", "image/png", picture.clone());
+    let layout = defaults::layout_of_kind(&p, LayoutType::Blank).unwrap_or_default();
+    let mut slide = defaults::new_slide(&mut p, layout);
+    // The chart comes first, so its kept parts are written before the picture.
+    let mut chart = Shape { id: ShapeId(p.alloc_id()), name: "Pie".into(), xfrm: Some(Xfrm::new(40.0, 40.0, 400.0, 300.0)), ..Default::default() };
+    chart.kind = ShapeKind::Chart(Box::new(Chart::sample(ChartType::Pie)));
+    slide.shapes.push(chart);
+    let mut pic = Shape { id: ShapeId(p.alloc_id()), name: "Pic".into(), xfrm: Some(Xfrm::new(500.0, 40.0, 80.0, 80.0)), ..Default::default() };
+    pic.kind = ShapeKind::Picture { fill: deckcraft_model::style::PictureFill { media: img, ..Default::default() } };
+    slide.shapes.push(pic);
+    p.slides.push(Arc::new(slide));
+    let base = deckcraft_pptx::export(&p).expect("export");
+    assert!(parts(&base).iter().any(|(n, d)| n == "ppt/media/image1.png" && *d == picture));
+
+    // The chart's own relationships reach the slide picture's part and a drawing whose
+    // relationships reach it too (and, hostile, the slide).
+    let chart_rels = format!(
+        r#"<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="{RT}/package" Target="../embeddings/Microsoft_Excel_Worksheet1.xlsx"/><Relationship Id="rId2" Type="{RT}/chartUserShapes" Target="../drawings/drawing1.xml"/><Relationship Id="rId3" Type="{RT}/image" Target="../media/image1.png"/></Relationships>"#
+    );
+    let drawing_rels = format!(
+        r#"<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="{RT}/image" Target="../media/image1.png"/><Relationship Id="rId2" Type="{RT}/slide" Target="../slides/slide1.xml"/></Relationships>"#
+    );
+    let drawing = br#"<c:userShapes xmlns:c="http://schemas.openxmlformats.org/drawingml/2006/chart"/>"#;
+    let src = rewrite(
+        &base,
+        |name, data| {
+            if name.starts_with("ppt/charts/chart") && name.ends_with(".xml") {
+                String::from_utf8(data)
+                    .expect("chart")
+                    .replacen("</c:chartSpace>", r#"<c:externalData r:id="rId1"/><c:userShapes r:id="rId2"/></c:chartSpace>"#, 1)
+                    .into_bytes()
+            } else {
+                data
+            }
+        },
+        &[
+            ("ppt/charts/_rels/chart1.xml.rels", chart_rels.as_bytes()),
+            ("ppt/drawings/drawing1.xml", drawing),
+            ("ppt/drawings/_rels/drawing1.xml.rels", drawing_rels.as_bytes()),
+            (EMBED, WORKBOOK),
+        ],
+    );
+
+    let saved = parts(&deckcraft_pptx::export(&deckcraft_pptx::import(&src).expect("import")).expect("export"));
+    unique_names(&saved);
+    let picture_parts: Vec<&String> = saved.iter().filter(|(_, d)| *d == picture).map(|(n, _)| n).collect();
+    assert!(picture_parts.iter().any(|n| *n == "ppt/media/image1.png"), "{picture_parts:?}");
+    let slide_rels = text_of(&saved, "ppt/slides/_rels/slide1.xml.rels");
+    assert!(slide_rels.contains("../media/image1.png"), "{slide_rels}");
+
+    // The chart's relationships point at the renamed parts, which hold the kept bytes.
+    let rels = text_of(&saved, "ppt/charts/_rels/chart1.xml.rels");
+    assert!(!rels.contains("image1.png") && !rels.contains("drawing1.xml") && !rels.contains("Worksheet1"), "{rels}");
+    let target = |rels: &str, id: &str| -> String {
+        let at = rels.find(&format!(r#"Id="{id}""#)).unwrap_or_else(|| panic!("{id} in {rels}"));
+        let rest = &rels[at..];
+        let t = rest.find(r#"Target=""#).expect("target") + 8;
+        rest[t..].split('"').next().unwrap_or("").to_string()
+    };
+    let resolve = |from_dir: &str, t: &str| format!("ppt/{}", t.trim_start_matches("../").trim_start_matches(from_dir));
+    let img_part = resolve("", &target(&rels, "rId3"));
+    assert!(img_part.starts_with("ppt/media/kept"), "{img_part}");
+    assert!(saved.iter().any(|(n, d)| *n == img_part && *d == picture), "{img_part}");
+    let drawing_part = resolve("", &target(&rels, "rId2"));
+    assert!(saved.iter().any(|(n, d)| *n == drawing_part && d.as_slice() == drawing.as_slice()), "{drawing_part}");
+    let wb = resolve("", &target(&rels, "rId1"));
+    assert!(saved.iter().any(|(n, d)| *n == wb && d.as_slice() == WORKBOOK), "{wb}");
+
+    // The drawing's own relationships follow the rename; the one to the slide is dropped.
+    let file = drawing_part.rsplit('/').next().unwrap_or("");
+    let drels = text_of(&saved, &format!("ppt/drawings/_rels/{file}.rels"));
+    assert_eq!(resolve("", &target(&drels, "rId1")), img_part, "{drels}");
+    assert!(!drels.contains("slide"), "{drels}");
+
+    // And the result reads back with the same kept parts.
+    let again = deckcraft_pptx::export(&deckcraft_pptx::import(&saved_zip(&saved)).expect("reimport")).expect("export again");
+    unique_names(&parts(&again));
+}
+
+fn saved_zip(parts: &[(String, Vec<u8>)]) -> Vec<u8> {
+    let mut out = zip::ZipWriter::new(Cursor::new(Vec::new()));
+    let opts = zip::write::SimpleFileOptions::default();
+    for (n, d) in parts {
+        out.start_file(n.as_str(), opts).expect("start");
+        out.write_all(d).expect("write");
+    }
+    out.finish().expect("finish").into_inner()
+}
+
+/// An unchanged Office 2016 chart keeps its embedded workbook too; its plain-chart fallback
+/// carries none.
+#[test]
+fn an_unchanged_chartex_keeps_its_embedded_workbook() {
+    let mut p = defaults::new_presentation(None);
+    p.slides.clear();
+    let layout = defaults::layout_of_kind(&p, LayoutType::Blank).unwrap_or_default();
+    let mut slide = defaults::new_slide(&mut p, layout);
+    let mut shape = Shape { id: ShapeId(p.alloc_id()), name: "Pie".into(), xfrm: Some(Xfrm::new(40.0, 40.0, 400.0, 300.0)), ..Default::default() };
+    shape.kind = ShapeKind::Chart(Box::new(Chart::sample(ChartType::Waterfall)));
+    slide.shapes.push(shape);
+    p.slides.push(Arc::new(slide));
+    let base = deckcraft_pptx::export(&p).expect("export");
+    assert!(parts(&base).iter().any(|(n, _)| n == "ppt/charts/chartEx1.xml"));
+    let rels = format!(
+        r#"<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="{RT}/package" Target="../embeddings/Microsoft_Excel_Worksheet1.xlsx"/></Relationships>"#
+    );
+    let src = rewrite(
+        &base,
+        |name, data| {
+            if name == "ppt/charts/chartEx1.xml" {
+                String::from_utf8(data)
+                    .expect("chartex")
+                    .replacen("<cx:chartData>", r#"<cx:chartData><cx:externalData r:id="rId1" cx:autoUpdate="0"/>"#, 1)
+                    .into_bytes()
+            } else {
+                data
+            }
+        },
+        &[("ppt/charts/_rels/chartEx1.xml.rels", rels.as_bytes()), (EMBED, WORKBOOK)],
+    );
+    let chart = chart_of(&src);
+    assert_eq!(chart.kind, ChartType::Waterfall);
+    assert!(chart.kept.parts.iter().any(|p| p.bytes == WORKBOOK));
+
+    let saved = parts(&deckcraft_pptx::export(&deckcraft_pptx::import(&src).expect("import")).expect("export"));
+    unique_names(&saved);
+    let xml = text_of(&saved, "ppt/charts/chartEx1.xml");
+    assert!(xml.contains("externalData"), "{xml}");
+    let rels = text_of(&saved, "ppt/charts/_rels/chartEx1.xml.rels");
+    assert!(rels.contains("../embeddings/kept1.xlsx"), "{rels}");
+    assert!(saved.iter().any(|(n, d)| n == "ppt/embeddings/kept1.xlsx" && d.as_slice() == WORKBOOK));
+    assert!(saved.iter().all(|(n, _)| n != "ppt/charts/_rels/chart1.xml.rels"), "the fallback chart has no workbook");
+    assert!(!text_of(&saved, "ppt/charts/chart1.xml").contains("externalData"));
+}
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1e6e103d..163a3dfa 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -95,16 +95,12 @@ the round trip even though DeckCraft doesn't model it.
 | Text warp (`prstTxWarp`) | yes | yes | All 40 presets rendered (`crates/geom/src/warp.rs`); adjust values (`avLst`) round-trip |
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | Merges and both diagonal borders round-trip |
-| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. Trendlines (type, order or period, forecast, intercept, equation and R²) are read, written and drawn. A combo chart's secondary value axis is read and is not written back when the chart is rebuilt |
-| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept; edited and new ones written from the model with a plain-chart fallback. Treemap and sunburst hierarchy levels kept; region maps kept, drawn as tiles (no map geometry) |
+| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. Trendlines (type, order or period, forecast, intercept, equation and R²) are read, written and drawn. A combo chart's secondary value axis is read and is not written back when the chart is rebuilt. An unchanged chart also keeps its embedded workbook and the other parts its relationships point at, under fresh `keptN` names so they never replace a part DeckCraft writes (#335); editing the chart drops that workbook instead of writing a stale one |
+| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept, with their embedded workbook (#335); edited and new ones written from the model with a plain-chart fallback. Treemap and sunburst hierarchy levels kept; region maps kept, drawn as tiles (no map geometry) |
 | SmartArt (`dgm`) | drawing part only, as a group; text laid out on its `dsp:txXfrm` rectangle | as shapes | Diagram data model lost on save |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save. A diagram with no relationship parts keeps its XML; the drawing and data parts are still dropped (#203) |
 | SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save (DeckCraft keeps its own outline in `.deckcraft` only) |
 | SmartArt (`dgm`) | the drawing part as a group, and the outline from the data model (Text Pane) | as a diagram: data model from the outline; layout, quick style and colour parts (the file's own kept until the layout is switched); the group as the cached drawing | DeckCraft's layout definitions are simple; a diagram without a cached drawing isn't drawn |
-| Tables with styles | yes | yes | |
-| Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. An unchanged chart also keeps its embedded workbook and the other parts its relationships point at (#335); editing the chart drops that workbook instead of writing a stale one |
-| Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, box) | no | no | |
-| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
 | Ink (`contentPart`) | yes | as a group of freeform lines | PowerPoint sees shapes, not ink |
diff --git a/docs/gaps.md b/docs/gaps.md
index 0d161449..e7454e85 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -244,9 +244,8 @@ Detail in [file-format-parity.md](file-format-parity.md).
   moving average, with forecast and the equation and R² label. A moving average is drawn with
   neither label. A combo chart's secondary value axis is read (`y2_*`,
   `Series.secondary_axis`) and is not written back when the chart is rebuilt.
-  chart types" (partial); `chartex` parts (waterfall, funnel, treemap, sunburst, histogram, box &
-  whisker) aren't read. An unchanged chart's embedded workbook now survives save (#335); editing
-  the chart still drops it rather than writing a stale spreadsheet.
+  An unchanged chart's embedded workbook now survives save (#335); editing the chart still
+  drops it rather than writing a stale spreadsheet.
 - **Impact:** most business decks have charts; editing their data is routine.
 - **Estimate:** 12–20 h. Data and elements are **beta blockers** (6–10 h).
 

From 398d34c7378484c7928d30fb68f6a9039604365b Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:30:29 -0400
Subject: [PATCH 365/376] Fix up merged PRs: cargo fmt

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/lib.rs       | 2 +-
 crates/render/src/tests.rs     | 8 ++------
 crates/ui-egui/src/textures.rs | 3 +--
 3 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index 57e131e7..695d6ab3 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -10,8 +10,8 @@
 pub mod cmd;
 pub mod connect;
 pub mod drawtable;
-pub mod fonts;
 pub mod file_access;
+pub mod fonts;
 pub mod guard;
 pub mod icons;
 pub mod io;
diff --git a/crates/render/src/tests.rs b/crates/render/src/tests.rs
index 529a6ed6..bdd9b17e 100644
--- a/crates/render/src/tests.rs
+++ b/crates/render/src/tests.rs
@@ -2435,12 +2435,8 @@ fn single_series_column_chart_varies_colours_by_point() {
         let mut c = Chart::sample(ChartType::Column);
         c.series.truncate(1);
         c.vary_colors = vary;
-        let sh = Shape {
-            id: ShapeId(800),
-            xfrm: Some(Xfrm::new(50.0, 50.0, 400.0, 300.0)),
-            kind: ShapeKind::Chart(Box::new(c)),
-            ..Default::default()
-        };
+        let sh =
+            Shape { id: ShapeId(800), xfrm: Some(Xfrm::new(50.0, 50.0, 400.0, 300.0)), kind: ShapeKind::Chart(Box::new(c)), ..Default::default() };
         render_slide(&deck_with(vec![sh]), 0, &RenderOpts { scale: 1.0, ..Default::default() }).pixels
     };
     assert_ne!(render(true), render(false));
diff --git a/crates/ui-egui/src/textures.rs b/crates/ui-egui/src/textures.rs
index d724a193..a17777b4 100644
--- a/crates/ui-egui/src/textures.rs
+++ b/crates/ui-egui/src/textures.rs
@@ -184,8 +184,7 @@ impl Textures {
         }
         let t0 = crate::now_ms();
         let render = |region: Region| {
-            let opts =
-                RenderOpts {
+            let opts = RenderOpts {
                 scale,
                 edit,
                 gif_times,

From 5ef510e57bb307ef34ce866f98bd8902d17bf2b4 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:35:50 -0400
Subject: [PATCH 366/376] Fix up #509: copy media by a typed walk of every
 reference

slide.reuse indexed src.slides[i] and found media by scanning JSON keys
(media/poster/preview/sound), which missed artistic-effect originals and would
miss any reference stored under another key. New engine module media_refs: one
typed walker over the model (written once, expanded for & and &mut) that visits
every MediaId a presentation, master, layout, slide or shape can hold: pictures
and their artistic originals, picture fills in shapes, lines, runs, table cells
and styles, chart series and points, backgrounds and theme format schemes;
media clips and posters, 3-D models, OLE/SmartArt previews and node pictures,
picture bullets, hyperlink, transition and animation sounds, embedded fonts.
slide.reuse now lists and remaps media through it, uses get() for slides, and
keeps a linked media item's link when copying it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/reuse.rs  | 167 ++++++++------
 crates/engine/src/lib.rs        |   1 +
 crates/engine/src/media_refs.rs | 390 ++++++++++++++++++++++++++++++++
 docs/gaps.md                    |   5 +-
 4 files changed, 494 insertions(+), 69 deletions(-)
 create mode 100644 crates/engine/src/media_refs.rs

diff --git a/crates/engine/src/cmd/reuse.rs b/crates/engine/src/cmd/reuse.rs
index d5e31b11..1025b01e 100644
--- a/crates/engine/src/cmd/reuse.rs
+++ b/crates/engine/src/cmd/reuse.rs
@@ -12,7 +12,7 @@ use deckcraft_model::{LayoutId, MasterId, MediaId, Presentation, ShapeId, ShapeK
 use serde_json::{Value, json};
 
 use super::*;
-use crate::{Result, Session};
+use crate::{Result, Session, media_refs};
 
 pub fn specs() -> Vec<CommandSpec> {
     vec![cmd!(
@@ -26,40 +26,15 @@ pub fn specs() -> Vec<CommandSpec> {
     )]
 }
 
-/// Keys under which the model stores a [`MediaId`] (pictures, media, posters, previews, sounds).
-const MEDIA_KEYS: [&str; 4] = ["media", "poster", "preview", "sound"];
-
-/// Rewrite every media id in `v` through `map`.
-fn remap_media(v: &mut Value, map: &HashMap<u32, u32>, depth: usize) {
-    if depth > 256 {
-        return;
-    }
-    match v {
-        Value::Object(o) => {
-            for (k, x) in o.iter_mut() {
-                if MEDIA_KEYS.contains(&k.as_str())
-                    && let Some(n) = x.as_u64().and_then(|n| u32::try_from(n).ok())
-                {
-                    if let Some(to) = map.get(&n) {
-                        *x = json!(to);
-                    }
-                    continue;
-                }
-                remap_media(x, map, depth + 1);
-            }
+/// Point every media id under `x` at its copy in the destination (`map`: source → destination).
+fn remap(map: &HashMap<MediaId, MediaId>) -> impl FnMut(&mut MediaId) + '_ {
+    move |id: &mut MediaId| {
+        if let Some(to) = map.get(id) {
+            *id = *to;
         }
-        Value::Array(a) => a.iter_mut().for_each(|x| remap_media(x, map, depth + 1)),
-        _ => {}
     }
 }
 
-/// `value` with its media ids rewritten, via its JSON form.
-fn with_media<T: serde::Serialize + serde::de::DeserializeOwned>(value: &T, map: &HashMap<u32, u32>) -> Result<T> {
-    let mut v = serde_json::to_value(value).map_err(|e| EngineError::Other(e.to_string()))?;
-    remap_media(&mut v, map, 0);
-    serde_json::from_value(v).map_err(|e| EngineError::Other(e.to_string()))
-}
-
 fn shape_ids(shapes: &[deckcraft_model::Shape]) -> Vec<ShapeId> {
     let mut v = vec![];
     deckcraft_model::walk(shapes, &mut |sh, _| v.push(sh.id));
@@ -132,20 +107,22 @@ fn reuse(s: &mut Session, p: &Value) -> Result<Value> {
     s.edit(|doc, sel| {
         let at = at.unwrap_or(sel.slide + 1).min(doc.slides.len());
         // Media: what the slides use is copied under fresh ids.
-        let mut media_map: HashMap<u32, u32> = HashMap::new();
+        let mut media_map: HashMap<MediaId, MediaId> = HashMap::new();
         // Keep Source Formatting: bring each source master used, once, with fresh ids.
         let mut layout_map: HashMap<LayoutId, LayoutId> = HashMap::new();
         if keep {
             let mut masters_done: Vec<MasterId> = vec![];
             for &i in &picked {
-                let Some((m, _)) = src.master_for(&src.slides[i]) else { continue };
+                let Some((m, _)) = src.slides.get(i).and_then(|sl| src.master_for(sl)) else { continue };
                 if masters_done.contains(&m.id) {
                     continue;
                 }
                 masters_done.push(m.id);
-                let used = serde_json::to_value(m).map_err(|e| EngineError::Other(e.to_string()))?;
+                let mut used = vec![];
+                media_refs::visit::master(m, &mut |id: &MediaId| used.push(*id));
                 copy_media(doc, &src, &used, &mut media_map);
-                let mut m: deckcraft_model::Master = with_media(m, &media_map)?;
+                let mut m = m.clone();
+                media_refs::visit_mut::master(&mut m, &mut remap(&media_map));
                 m.id = MasterId(doc.alloc_id());
                 renumber(doc, &mut m.shapes);
                 for l in &mut m.layouts {
@@ -159,10 +136,10 @@ fn reuse(s: &mut Session, p: &Value) -> Result<Value> {
         }
         let mut new_ids = vec![];
         for (k, &i) in picked.iter().enumerate() {
-            let from = &src.slides[i];
-            let used = serde_json::to_value(from.as_ref()).map_err(|e| EngineError::Other(e.to_string()))?;
-            copy_media(doc, &src, &used, &mut media_map);
-            let mut sl: Slide = with_media(from.as_ref(), &media_map)?;
+            let Some(from) = src.slides.get(i) else { continue };
+            copy_media(doc, &src, &media_refs::slide_media(from), &mut media_map);
+            let mut sl: Slide = from.as_ref().clone();
+            media_refs::visit_mut::slide(&mut sl, &mut remap(&media_map));
             sl.id = SlideId(doc.alloc_id());
             let map = renumber(doc, &mut sl.shapes);
             for a in &mut sl.animations {
@@ -188,39 +165,97 @@ fn reuse(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
-/// Copy the source media `used` refers to into `doc` under fresh ids, once each.
-fn copy_media(doc: &mut Presentation, src: &Presentation, used: &Value, map: &mut HashMap<u32, u32>) {
-    let mut ids = vec![];
-    collect_media(used, &mut ids, 0);
-    for id in ids {
+/// Copy the source media `used` into `doc` under fresh ids, once each (identical bytes already in
+/// `doc` are shared; a linked item keeps its link).
+fn copy_media(doc: &mut Presentation, src: &Presentation, used: &[MediaId], map: &mut HashMap<MediaId, MediaId>) {
+    for &id in used {
         if map.contains_key(&id) {
             continue;
         }
-        if let Some(m) = src.media(MediaId(id)) {
-            let new = doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone());
-            map.insert(id, new.0);
-        }
+        let Some(m) = src.media(id) else { continue };
+        let new = if m.link.is_some() {
+            let mut item = m.clone();
+            item.id = MediaId(doc.alloc_id());
+            let new = item.id;
+            doc.media.push(item);
+            new
+        } else {
+            doc.add_media(&m.name, &m.content_type, m.data.as_ref().clone())
+        };
+        map.insert(id, new);
     }
 }
 
-/// The media ids `v` refers to.
-fn collect_media(v: &Value, out: &mut Vec<u32>, depth: usize) {
-    if depth > 256 {
-        return;
-    }
-    match v {
-        Value::Object(o) => {
-            for (k, x) in o {
-                if MEDIA_KEYS.contains(&k.as_str())
-                    && let Some(n) = x.as_u64().and_then(|n| u32::try_from(n).ok())
-                {
-                    out.push(n);
-                } else {
-                    collect_media(x, out, depth + 1);
-                }
-            }
+#[cfg(test)]
+mod tests {
+    use deckcraft_model::style::{Artistic, Fill, PictureFill};
+    use deckcraft_model::text::{Action, Bullet, Hyperlink, TextBody};
+    use deckcraft_model::{Background, MediaClip, Shape, ShapeKind, defaults};
+    use serde_json::json;
+
+    use super::*;
+
+    /// Every kind of media a slide can hold comes along, each pointing at its own bytes: the
+    /// artistic-effect original, a background picture, poster, sounds and picture bullets too.
+    #[test]
+    fn reused_slides_bring_every_media_reference() {
+        let mut src = defaults::new_presentation(None);
+        let blobs: Vec<Vec<u8>> = (0..8u8).map(|i| vec![0xD0, i, i, i]).collect();
+        let ids: Vec<MediaId> =
+            blobs.iter().enumerate().map(|(i, b)| src.add_media(&format!("m{i}.bin"), "application/octet-stream", b.clone())).collect();
+        let id = |i: usize| ids.get(i).copied().unwrap_or_default();
+        let mut text = TextBody::from_text("bullet");
+        if let Some(p) = text.paragraphs.first_mut() {
+            p.props.bullet = Some(Bullet::Picture { media: id(6) });
         }
-        Value::Array(a) => a.iter().for_each(|x| collect_media(x, out, depth + 1)),
-        _ => {}
+        let slide = Arc::make_mut(src.slides.first_mut().expect("slide"));
+        slide.shapes = vec![
+            Shape {
+                id: ShapeId(9001),
+                kind: ShapeKind::Picture {
+                    fill: PictureFill {
+                        media: id(0),
+                        artistic: Some(Artistic { effect: "artisticBlur".into(), original: id(1) }),
+                        ..Default::default()
+                    },
+                },
+                ..Default::default()
+            },
+            Shape {
+                id: ShapeId(9002),
+                kind: ShapeKind::Media(MediaClip { media: id(2), poster: Some(id(3)), ..Default::default() }),
+                ..Default::default()
+            },
+            Shape {
+                id: ShapeId(9003),
+                click: Some(Hyperlink {
+                    action: Action::NextSlide,
+                    tooltip: String::new(),
+                    highlight_click: false,
+                    sound: Some(id(5)),
+                    stop_sound: false,
+                }),
+                text: Some(text),
+                ..Default::default()
+            },
+        ];
+        slide.background = Some(Background::Fill { fill: Fill::Picture(PictureFill { media: id(4), ..Default::default() }) });
+        slide.transition = Some(deckcraft_model::anim::Transition { sound: Some(id(7)), ..Default::default() });
+        let bytes = deckcraft_format::save(&src).expect("save");
+
+        let mut s = Session::with_new();
+        let own = vec![1u8, 2, 3];
+        let own_id = s.edit(|doc, _| Ok(doc.add_media("own.bin", "application/octet-stream", own.clone()))).expect("own media");
+        s.execute("slide.reuse", &json!({"data": super::super::base64_encode(&bytes), "name": "src.deckcraft", "slides": [0]})).expect("reuse");
+        let doc = &s.doc().expect("doc").doc;
+        assert_eq!(doc.media(own_id).map(|m| m.data.as_slice() == own.as_slice()), Some(true), "own media untouched");
+        let reused = doc.slides.get(1).expect("reused slide");
+        let got: Vec<Vec<u8>> =
+            media_refs::slide_media(reused).iter().map(|m| doc.media(*m).map(|m| m.data.as_ref().clone()).unwrap_or_default()).collect();
+        let mut got = got;
+        got.sort();
+        let mut want = blobs.clone();
+        want.sort();
+        assert_eq!(got, want, "every reference resolves to its own copied bytes");
     }
 }
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index b6c0bbe7..60eebaf8 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -17,6 +17,7 @@ pub mod icons;
 pub mod inkshape;
 pub mod keys;
 pub mod links;
+pub mod media_refs;
 pub mod recovery;
 pub mod sample;
 pub mod sounds;
diff --git a/crates/engine/src/media_refs.rs b/crates/engine/src/media_refs.rs
new file mode 100644
index 00000000..33bc6a37
--- /dev/null
+++ b/crates/engine/src/media_refs.rs
@@ -0,0 +1,390 @@
+//! Every [`MediaId`] the model can reference, found by type rather than by scanning JSON keys.
+//!
+//! One walker, written once ([`walkers!`]) and expanded twice: [`visit`] reads ids, [`visit_mut`]
+//! rewrites them in place. It covers pictures (and their artistic-effect originals), picture fills
+//! wherever a fill can sit (shapes, lines, text runs, table cells and styles, chart series and
+//! points, backgrounds, theme format schemes), media clips and their posters, 3-D models, OLE and
+//! SmartArt previews, SmartArt node pictures, picture bullets, hyperlink, transition and
+//! animation sounds, and embedded font faces. Adding a `MediaId` field to the model means adding
+//! it here; the shape kinds are matched exhaustively so a new kind can't be missed.
+
+use std::collections::HashSet;
+
+use deckcraft_model::{MediaId, Presentation, Shape, Slide};
+
+macro_rules! walkers {
+    ($($m:tt)?) => {
+        use deckcraft_model::chart::Chart;
+        use deckcraft_model::style::{Fill, Line, PictureFill};
+        use deckcraft_model::table::{Table, TableBorder, TablePartStyle, TableStyleDef};
+        use deckcraft_model::text::{Hyperlink, ListStyle, ParaProps, RunProps, TextBody, Bullet};
+        use deckcraft_model::theme::Theme;
+        use deckcraft_model::{Background, EmbeddedFont, Layout, Master, MediaId, Shape, ShapeKind, Slide};
+
+        /// Deepest group nesting walked (the model's other walkers stop at 64 too).
+        const MAX_DEPTH: usize = 64;
+
+        pub type F<'a> = dyn FnMut(&$($m)? MediaId) + 'a;
+
+        pub fn picture(p: &$($m)? PictureFill, f: &mut F) {
+            f(&$($m)? p.media);
+            if let Some(a) = &$($m)? p.artistic {
+                f(&$($m)? a.original);
+            }
+        }
+
+        pub fn fill(x: &$($m)? Fill, f: &mut F) {
+            if let Fill::Picture(p) = x {
+                picture(p, f);
+            }
+        }
+
+        fn opt_fill(x: &$($m)? Option<Fill>, f: &mut F) {
+            if let Some(x) = x {
+                fill(x, f);
+            }
+        }
+
+        pub fn line(l: &$($m)? Line, f: &mut F) {
+            opt_fill(&$($m)? l.fill, f);
+        }
+
+        fn opt_line(l: &$($m)? Option<Line>, f: &mut F) {
+            if let Some(l) = l {
+                line(l, f);
+            }
+        }
+
+        fn link(h: &$($m)? Option<Hyperlink>, f: &mut F) {
+            if let Some(Hyperlink { sound: Some(id), .. }) = h {
+                f(id);
+            }
+        }
+
+        fn run(r: &$($m)? RunProps, f: &mut F) {
+            opt_fill(&$($m)? r.fill, f);
+            opt_line(&$($m)? r.outline, f);
+            link(&$($m)? r.link, f);
+            link(&$($m)? r.hover, f);
+        }
+
+        fn para(p: &$($m)? ParaProps, f: &mut F) {
+            if let Some(Bullet::Picture { media }) = &$($m)? p.bullet {
+                f(media);
+            }
+        }
+
+        pub fn list(l: &$($m)? ListStyle, f: &mut F) {
+            for lv in (&$($m)? l.levels).into_iter().flatten() {
+                para(&$($m)? lv.para, f);
+                run(&$($m)? lv.run, f);
+            }
+        }
+
+        pub fn text(t: &$($m)? TextBody, f: &mut F) {
+            list(&$($m)? t.list_style, f);
+            for p in &$($m)? t.paragraphs {
+                para(&$($m)? p.props, f);
+                run(&$($m)? p.def_props, f);
+                run(&$($m)? p.end_props, f);
+                for r in &$($m)? p.runs {
+                    run(&$($m)? r.props, f);
+                }
+            }
+        }
+
+        fn table(t: &$($m)? Table, f: &mut F) {
+            opt_fill(&$($m)? t.background, f);
+            for row in &$($m)? t.rows {
+                for c in &$($m)? row.cells {
+                    text(&$($m)? c.text, f);
+                    opt_fill(&$($m)? c.fill, f);
+                    for b in &$($m)? c.borders {
+                        opt_line(b, f);
+                    }
+                    opt_line(&$($m)? c.diag_down, f);
+                    opt_line(&$($m)? c.diag_up, f);
+                }
+            }
+        }
+
+        fn table_part(s: &$($m)? TablePartStyle, f: &mut F) {
+            opt_fill(&$($m)? s.fill, f);
+            for b in &$($m)? s.borders {
+                if let Some(TableBorder::Line { line: l }) = b {
+                    line(l, f);
+                }
+            }
+        }
+
+        pub fn table_style(t: &$($m)? TableStyleDef, f: &mut F) {
+            for (_, s) in &$($m)? t.parts {
+                table_part(s, f);
+            }
+            if let Some(s) = &$($m)? t.background {
+                table_part(s, f);
+            }
+        }
+
+        fn chart(c: &$($m)? Chart, f: &mut F) {
+            for s in &$($m)? c.series {
+                opt_fill(&$($m)? s.fill, f);
+                opt_line(&$($m)? s.line, f);
+                for (_, x) in &$($m)? s.point_fills {
+                    fill(x, f);
+                }
+            }
+            opt_fill(&$($m)? c.plot_fill, f);
+            opt_fill(&$($m)? c.chart_fill, f);
+        }
+
+        fn shape_at(s: &$($m)? Shape, f: &mut F, depth: usize) {
+            if depth > MAX_DEPTH {
+                return;
+            }
+            match &$($m)? s.kind {
+                ShapeKind::Shape | ShapeKind::Connector { .. } | ShapeKind::Ink { .. } => {}
+                ShapeKind::Picture { fill } => picture(fill, f),
+                ShapeKind::Group { children, .. } => {
+                    for c in children {
+                        shape_at(c, f, depth + 1);
+                    }
+                }
+                ShapeKind::Table(t) => table(t, f),
+                ShapeKind::Chart(c) => chart(c, f),
+                ShapeKind::Media(m) => {
+                    f(&$($m)? m.media);
+                    if let Some(p) = &$($m)? m.poster {
+                        f(p);
+                    }
+                }
+                ShapeKind::Model3d { media, poster } => {
+                    f(media);
+                    if let Some(p) = poster {
+                        f(p);
+                    }
+                }
+                ShapeKind::Opaque { preview, .. } => {
+                    if let Some(p) = preview {
+                        f(p);
+                    }
+                }
+            }
+            opt_fill(&$($m)? s.fill, f);
+            opt_line(&$($m)? s.line, f);
+            if let Some(t) = &$($m)? s.text {
+                text(t, f);
+            }
+            link(&$($m)? s.click, f);
+            link(&$($m)? s.hover, f);
+            if let Some(d) = &$($m)? s.diagram {
+                for n in &$($m)? d.nodes {
+                    if let Some(p) = &$($m)? n.picture {
+                        f(p);
+                    }
+                }
+            }
+        }
+
+        /// A shape and, for a group, everything in it.
+        pub fn shape(s: &$($m)? Shape, f: &mut F) {
+            shape_at(s, f, 0);
+        }
+
+        pub fn shapes(v: &$($m)? [Shape], f: &mut F) {
+            for s in v {
+                shape_at(s, f, 0);
+            }
+        }
+
+        fn background(b: &$($m)? Option<Background>, f: &mut F) {
+            if let Some(Background::Fill { fill: x }) = b {
+                fill(x, f);
+            }
+        }
+
+        /// A slide: shapes, background, transition and animation sounds, notes.
+        pub fn slide(s: &$($m)? Slide, f: &mut F) {
+            shapes(&$($m)? s.shapes, f);
+            background(&$($m)? s.background, f);
+            if let Some(t) = &$($m)? s.transition
+                && let Some(id) = &$($m)? t.sound
+            {
+                f(id);
+            }
+            for a in &$($m)? s.animations {
+                if let Some(id) = &$($m)? a.sound {
+                    f(id);
+                }
+            }
+            text(&$($m)? s.notes, f);
+        }
+
+        pub fn layout(l: &$($m)? Layout, f: &mut F) {
+            shapes(&$($m)? l.shapes, f);
+            background(&$($m)? l.background, f);
+        }
+
+        pub fn theme(t: &$($m)? Theme, f: &mut F) {
+            for x in &$($m)? t.format.fills {
+                fill(x, f);
+            }
+            for x in &$($m)? t.format.bg_fills {
+                fill(x, f);
+            }
+            for l in &$($m)? t.format.lines {
+                line(l, f);
+            }
+        }
+
+        /// A master with its theme, text styles and layouts.
+        pub fn master(m: &$($m)? Master, f: &mut F) {
+            theme(&$($m)? m.theme, f);
+            shapes(&$($m)? m.shapes, f);
+            background(&$($m)? m.background, f);
+            list(&$($m)? m.title_style, f);
+            list(&$($m)? m.body_style, f);
+            list(&$($m)? m.other_style, f);
+            for l in &$($m)? m.layouts {
+                layout(l, f);
+            }
+        }
+
+        pub fn font(e: &$($m)? EmbeddedFont, f: &mut F) {
+            for id in [&$($m)? e.regular, &$($m)? e.bold, &$($m)? e.italic, &$($m)? e.bold_italic].into_iter().flatten() {
+                f(id);
+            }
+        }
+    };
+}
+
+/// Read every media id under a part of the model.
+pub mod visit {
+    walkers!();
+}
+
+/// Rewrite every media id under a part of the model in place.
+pub mod visit_mut {
+    walkers!(mut);
+}
+
+/// Every media reference in a presentation: slides, masters (with their layouts and themes),
+/// the notes and handout masters, default text style, table styles and embedded fonts.
+pub fn visit_presentation(p: &Presentation, f: &mut visit::F) {
+    for s in &p.slides {
+        visit::slide(s, f);
+    }
+    for m in p.masters.iter().chain(p.notes_master.iter()).chain(p.handout_master.iter()) {
+        visit::master(m, f);
+    }
+    visit::list(&p.default_text_style, f);
+    for t in &p.table_styles {
+        visit::table_style(t, f);
+    }
+    for e in &p.embedded_fonts {
+        visit::font(e, f);
+    }
+}
+
+/// The media ids a presentation references, each once, in the order first met.
+pub fn presentation_media(p: &Presentation) -> Vec<MediaId> {
+    collect(|f| visit_presentation(p, f))
+}
+
+/// The media ids a slide references (shapes, background, sounds, notes), each once.
+pub fn slide_media(s: &Slide) -> Vec<MediaId> {
+    collect(|f| visit::slide(s, f))
+}
+
+/// The media ids shapes reference (groups included), each once.
+pub fn shapes_media(v: &[Shape]) -> Vec<MediaId> {
+    collect(|f| visit::shapes(v, f))
+}
+
+fn collect(walk: impl FnOnce(&mut visit::F)) -> Vec<MediaId> {
+    let mut seen = HashSet::new();
+    let mut out = vec![];
+    walk(&mut |id: &MediaId| {
+        if seen.insert(*id) {
+            out.push(*id);
+        }
+    });
+    out
+}
+
+#[cfg(test)]
+mod tests {
+    use std::sync::Arc;
+
+    use deckcraft_model::style::{Artistic, Fill, PictureFill};
+    use deckcraft_model::text::{Action, Bullet, Hyperlink};
+    use deckcraft_model::{Background, MediaClip, ShapeKind, defaults};
+
+    use super::*;
+
+    fn pf(media: u32) -> PictureFill {
+        PictureFill { media: MediaId(media), ..Default::default() }
+    }
+
+    /// One reference of each kind, every one a different id.
+    fn deck() -> Presentation {
+        let mut p = defaults::new_presentation(None);
+        let mut s = (*p.slides.first().cloned().unwrap_or_default()).clone();
+        let pic = Shape {
+            kind: ShapeKind::Picture {
+                fill: PictureFill { artistic: Some(Artistic { effect: "artisticBlur".into(), original: MediaId(9002) }), ..pf(9001) },
+            },
+            ..Default::default()
+        };
+        let clip = Shape {
+            kind: ShapeKind::Media(MediaClip { media: MediaId(9003), poster: Some(MediaId(9004)), ..Default::default() }),
+            ..Default::default()
+        };
+        let mut text = deckcraft_model::text::TextBody::from_text("x");
+        if let Some(para) = text.paragraphs.first_mut() {
+            para.props.bullet = Some(Bullet::Picture { media: MediaId(9007) });
+        }
+        let filled = Shape {
+            fill: Some(Fill::Picture(pf(9005))),
+            click: Some(Hyperlink {
+                action: Action::NextSlide,
+                tooltip: String::new(),
+                highlight_click: false,
+                sound: Some(MediaId(9006)),
+                stop_sound: false,
+            }),
+            text: Some(text),
+            ..Default::default()
+        };
+        let group = Shape { kind: ShapeKind::Group { children: vec![pic, clip], child: Default::default() }, ..Default::default() };
+        s.shapes = vec![group, filled];
+        s.background = Some(Background::Fill { fill: Fill::Picture(pf(9008)) });
+        p.slides = vec![Arc::new(s)];
+        if let Some(m) = p.masters.first_mut() {
+            Arc::make_mut(m).theme.format.bg_fills.push(Fill::Picture(pf(9009)));
+        }
+        p.embedded_fonts.push(deckcraft_model::EmbeddedFont { regular: Some(MediaId(9010)), ..Default::default() });
+        p
+    }
+
+    #[test]
+    fn every_kind_of_reference_is_found() {
+        let p = deck();
+        let mut got = presentation_media(&p);
+        got.sort();
+        assert_eq!(got, (9001..=9010).map(MediaId).collect::<Vec<_>>());
+        let mut slide = p.slides.first().map(|s| slide_media(s)).unwrap_or_default();
+        slide.sort();
+        assert_eq!(slide, (9001..=9008).map(MediaId).collect::<Vec<_>>());
+    }
+
+    #[test]
+    fn visit_mut_rewrites_every_reference() {
+        let p = deck();
+        let mut s = (**p.slides.first().expect("slide")).clone();
+        visit_mut::slide(&mut s, &mut |id: &mut MediaId| id.0 += 100);
+        let mut got = slide_media(&s);
+        got.sort();
+        assert_eq!(got, (9101..=9108).map(MediaId).collect::<Vec<_>>());
+    }
+}
diff --git a/docs/gaps.md b/docs/gaps.md
index 89485553..5723c8ba 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -349,11 +349,10 @@ selected effect, and most of the effect gallery. Detail in
 - **Estimate:** 3–6 h to review, land and round-trip.
 
 ### Smaller missing rows
-Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
+Zoom (summary/section/slide, 6–10 h), reuse slides pane with thumbnails (1–2 h; `slide.reuse` inserts from a file), laser pointer (1–2 h), transition
 sounds (1–2 h), artistic effects (6–10 h), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 sounds (1–2 h), artistic effects (3–6 h for the other 15 of 22; 7 approximated and round-tripped), remove background (6–10 h; needs a model or a classical
-Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), transition
-Zoom (summary/section/slide, 6–10 h), reuse slides pane with thumbnails (1–2 h; `slide.reuse` inserts from a file), laser pointer (1–2 h), transition
+Zoom (summary/section/slide, 6–10 h), reuse slides pane with thumbnails (1–2 h), transition
 sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
 matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
 show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile

From 6050c04ecdb09281ec234d131f533f7a6cb52c34 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:39:15 -0400
Subject: [PATCH 367/376] Fix up #513: keep every referenced media; cap picture
 decoding

picture.compress decided which originals were still in use by scanning JSON
keys, which missed artistic-effect originals (and the embedded-font shape it
assumed no longer exists), so compressing a picture whose bytes were also
another picture's artistic original deleted media still in use. It now uses
the engine's typed media walker (media_refs::presentation_media).

Decoding is capped: the header's size is read first and pictures over 64 MP
are left alone, and the decoder runs with image::Limits (512 MiB allocation),
instead of decoding up to 400 MP before checking.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/compress.rs | 140 ++++++++++++++++++++++--------
 1 file changed, 104 insertions(+), 36 deletions(-)

diff --git a/crates/engine/src/cmd/compress.rs b/crates/engine/src/cmd/compress.rs
index 37dfe2ea..efa7ebfb 100644
--- a/crates/engine/src/cmd/compress.rs
+++ b/crates/engine/src/cmd/compress.rs
@@ -5,7 +5,7 @@ use std::collections::{HashMap, HashSet};
 use std::sync::Arc;
 
 use deckcraft_model::style::PictureFill;
-use deckcraft_model::{MediaId, Presentation, Shape, ShapeId, ShapeKind};
+use deckcraft_model::{MediaId, Shape, ShapeId, ShapeKind};
 use serde_json::{Value, json};
 
 use super::*;
@@ -35,6 +35,28 @@ fn real_crop(c: &[f64; 4]) -> bool {
     c.iter().all(|v| (0.0..1.0).contains(v)) && c.iter().any(|v| *v > 0.0) && c[0] + c[2] < 1.0 && c[1] + c[3] < 1.0
 }
 
+/// Largest picture decoded for compression, in pixels (a 61 MP camera frame fits); bigger ones
+/// are left as they are.
+const MAX_PIXELS: u64 = 64_000_000;
+/// Most memory the decoder may allocate for one picture.
+const MAX_DECODE_BYTES: u64 = 512 << 20;
+
+/// Decode `data` within [`MAX_PIXELS`] and [`MAX_DECODE_BYTES`]: the size is read from the header
+/// first, so a picture claiming to be huge is never decoded.
+fn decode(data: &[u8], format: image::ImageFormat) -> Option<image::DynamicImage> {
+    let (w, h) = image::ImageReader::with_format(std::io::Cursor::new(data), format).into_dimensions().ok()?;
+    if w == 0 || h == 0 || u64::from(w) * u64::from(h) > MAX_PIXELS {
+        return None;
+    }
+    let mut reader = image::ImageReader::with_format(std::io::Cursor::new(data), format);
+    let mut limits = image::Limits::default();
+    limits.max_image_width = Some(w);
+    limits.max_image_height = Some(h);
+    limits.max_alloc = Some(MAX_DECODE_BYTES);
+    reader.limits(limits);
+    reader.decode().ok()
+}
+
 /// Compress `data` for a picture shown `w_pt` × `h_pt` with `crop`, at `ppi`. `None` when the
 /// format isn't a raster we re-encode (SVG, EMF, GIF…) or nothing would get smaller.
 fn pack(data: &[u8], crop: [f64; 4], w_pt: f64, h_pt: f64, ppi: f64, delete_cropped: bool) -> Option<Packed> {
@@ -43,9 +65,9 @@ fn pack(data: &[u8], crop: [f64; 4], w_pt: f64, h_pt: f64, ppi: f64, delete_crop
     if !matches!(format, F::Png | F::Jpeg | F::Bmp | F::Tiff | F::WebP) {
         return None;
     }
-    let mut img = image::load_from_memory_with_format(data, format).ok()?;
+    let mut img = decode(data, format)?;
     let (iw, ih) = (img.width() as f64, img.height() as f64);
-    if iw < 1.0 || ih < 1.0 || iw * ih > 400_000_000.0 {
+    if iw < 1.0 || ih < 1.0 {
         return None;
     }
     let cut = delete_cropped && real_crop(&crop);
@@ -108,37 +130,6 @@ fn pictures_mut<'a>(shapes: &'a mut [Shape], want: &dyn Fn(ShapeId) -> bool, out
     }
 }
 
-/// Media ids anything in the presentation still refers to (everything but the media list).
-fn referenced_media(doc: &Presentation) -> HashSet<u32> {
-    fn scan(v: &Value, out: &mut HashSet<u32>, depth: usize) {
-        if depth > 256 {
-            return;
-        }
-        match v {
-            Value::Object(o) => {
-                for (k, x) in o {
-                    match (k.as_str(), x.as_u64()) {
-                        ("media" | "poster" | "preview" | "sound", Some(n)) => {
-                            out.insert(n as u32);
-                        }
-                        _ => scan(x, out, depth + 1),
-                    }
-                }
-            }
-            Value::Array(a) => a.iter().for_each(|x| scan(x, out, depth + 1)),
-            _ => {}
-        }
-    }
-    let mut out = HashSet::new();
-    let mut shell = doc.clone();
-    shell.media.clear();
-    if let Ok(v) = serde_json::to_value(&shell) {
-        scan(&v, &mut out, 0);
-    }
-    out.extend(doc.embedded_fonts.iter().flat_map(|e| [e.regular, e.bold, e.italic, e.bold_italic]).flatten().map(|m| m.0));
-    out
-}
-
 fn compress(s: &mut Session, p: &Value) -> Result<Value> {
     let ppi = f64_param(p, "ppi").unwrap_or(220.0);
     if !ppi.is_finite() || !(36.0..=1200.0).contains(&ppi) {
@@ -204,8 +195,9 @@ fn compress(s: &mut Session, p: &Value) -> Result<Value> {
         }
         // Drop the originals nothing uses any more, so the saved file actually shrinks.
         if !changed.is_empty() {
-            let used = referenced_media(doc);
-            doc.media.retain(|m| !changed.contains(&m.id) || used.contains(&m.id.0));
+            // Typed walk of every reference (artistic originals, fills, posters, sounds, fonts…).
+            let used: HashSet<MediaId> = crate::media_refs::presentation_media(doc).into_iter().collect();
+            doc.media.retain(|m| !changed.contains(&m.id) || used.contains(&m.id));
         }
         Ok(json!({"pictures": count, "before": before, "after": after, "ppi": ppi}))
     })
@@ -249,4 +241,80 @@ mod tests {
         let img = image::load_from_memory(&pk.bytes).unwrap();
         assert_eq!(img.width(), 200);
     }
+
+    /// A PNG whose header claims `w` × `h` (no pixel data): enough for the size check.
+    fn png_header(w: u32, h: u32) -> Vec<u8> {
+        fn crc(bytes: &[u8]) -> u32 {
+            let mut c = 0xFFFF_FFFFu32;
+            for b in bytes {
+                c ^= u32::from(*b);
+                for _ in 0..8 {
+                    c = if c & 1 == 1 { 0xEDB8_8320 ^ (c >> 1) } else { c >> 1 };
+                }
+            }
+            !c
+        }
+        fn chunk(out: &mut Vec<u8>, kind: &[u8], data: &[u8]) {
+            let body: Vec<u8> = kind.iter().chain(data).copied().collect();
+            out.extend((data.len() as u32).to_be_bytes());
+            out.extend(&body);
+            out.extend(crc(&body).to_be_bytes());
+        }
+        let mut ihdr = w.to_be_bytes().to_vec();
+        ihdr.extend(h.to_be_bytes());
+        ihdr.extend([8, 2, 0, 0, 0]);
+        let mut out = b"\x89PNG\r\n\x1a\n".to_vec();
+        chunk(&mut out, b"IHDR", &ihdr);
+        chunk(&mut out, b"IDAT", &[]);
+        chunk(&mut out, b"IEND", &[]);
+        out
+    }
+
+    #[test]
+    fn huge_pictures_are_not_decoded() {
+        // 72 MP: over the cap, though within what the decoder would allocate by default.
+        let data = png_header(9_000, 8_000);
+        assert_eq!(
+            image::ImageReader::with_format(std::io::Cursor::new(&data), image::ImageFormat::Png).into_dimensions().ok(),
+            Some((9_000, 8_000))
+        );
+        assert!(decode(&data, image::ImageFormat::Png).is_none());
+        assert!(pack(&data, [0.0; 4], 72.0, 72.0, 96.0, true).is_none());
+    }
+
+    /// Compressing a picture whose media is also another picture's artistic-effect original must
+    /// keep that media: the effect needs it to be changed or removed.
+    #[test]
+    fn media_still_used_as_an_artistic_original_is_kept() {
+        use deckcraft_model::style::Artistic;
+        let mut s = Session::with_new();
+        let big = png(1200, 600);
+        let processed = png(1100, 600);
+        s.edit(|doc, _| {
+            let original = doc.add_media("original.png", "image/png", big.clone());
+            let shown = doc.add_media("processed.png", "image/png", processed.clone());
+            let slide = Arc::make_mut(doc.slides.first_mut().ok_or_else(|| bad("test", "no slide"))?);
+            let xfrm = Some(deckcraft_geom::Xfrm::new(0.0, 0.0, 72.0, 36.0));
+            let with_effect =
+                PictureFill { media: shown, artistic: Some(Artistic { effect: "artisticBlur".into(), original }), ..Default::default() };
+            slide.shapes.push(Shape { id: ShapeId(70_001), xfrm, kind: ShapeKind::Picture { fill: with_effect }, ..Default::default() });
+            slide.shapes.push(Shape {
+                id: ShapeId(70_002),
+                xfrm,
+                kind: ShapeKind::Picture { fill: PictureFill { media: original, ..Default::default() } },
+                ..Default::default()
+            });
+            Ok(())
+        })
+        .unwrap();
+        let r = s.execute("picture.compress", &json!({"all": true, "ppi": 96})).unwrap();
+        assert_eq!(r["pictures"], 2, "{r}");
+        let doc = &s.doc().unwrap().doc;
+        // Every reference left in the deck resolves to media that is still there.
+        for id in crate::media_refs::presentation_media(doc) {
+            assert!(doc.media(id).is_some(), "{id:?} was deleted while still referenced");
+        }
+        assert!(doc.media.iter().any(|m| m.data.as_slice() == big.as_slice()), "the artistic original was deleted");
+        assert!(!doc.media.iter().any(|m| m.data.as_slice() == processed.as_slice()), "the replaced processed picture is dropped");
+    }
 }

From b54ec601d836a4de2af9a783453d48c21ab4428f Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:42:23 -0400
Subject: [PATCH 368/376] Fix up #508: read 3-D settings with the XML parser;
 keep only known presets

Shape3d::parse scanned the kept a:scene3d/a:sp3d XML as strings and copied the
camera, light rig, direction, material and bevel names from the file into the
XML it writes back unescaped. It now parses the fragment with the importer's
XML reader (exported from deckcraft-pptx as parse_xml) and keeps a value only
when it is in the format's lists (ST_PresetCameraType, ST_LightRigType,
ST_LightRigDirection, ST_PresetMaterialType, ST_BevelPresetType), else the
default; lengths are clamped and the extrusion/contour colours are
re-serialized (escaped) by the XML writer. The Format Shape pane rows in
ui-parity.md that earlier merges had duplicated are folded into one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/three_d.rs | 280 ++++++++++++++++++++++---------
 crates/pptx/src/lib.rs           |   4 +
 docs/ui-parity.md                |   6 +-
 3 files changed, 209 insertions(+), 81 deletions(-)

diff --git a/crates/engine/src/cmd/three_d.rs b/crates/engine/src/cmd/three_d.rs
index fe53450b..881a39d1 100644
--- a/crates/engine/src/cmd/three_d.rs
+++ b/crates/engine/src/cmd/three_d.rs
@@ -62,6 +62,126 @@ pub const LIGHTS: &[&str] = &[
     "brightRoom",
 ];
 
+/// Every camera preset the file format defines (`ST_PresetCameraType`); a file's camera is kept
+/// only when it is one of these.
+pub const ALL_CAMERAS: &[&str] = &[
+    "legacyObliqueTopLeft",
+    "legacyObliqueTop",
+    "legacyObliqueTopRight",
+    "legacyObliqueLeft",
+    "legacyObliqueFront",
+    "legacyObliqueRight",
+    "legacyObliqueBottomLeft",
+    "legacyObliqueBottom",
+    "legacyObliqueBottomRight",
+    "legacyPerspectiveTopLeft",
+    "legacyPerspectiveTop",
+    "legacyPerspectiveTopRight",
+    "legacyPerspectiveLeft",
+    "legacyPerspectiveFront",
+    "legacyPerspectiveRight",
+    "legacyPerspectiveBottomLeft",
+    "legacyPerspectiveBottom",
+    "legacyPerspectiveBottomRight",
+    "orthographicFront",
+    "isometricTopUp",
+    "isometricTopDown",
+    "isometricBottomUp",
+    "isometricBottomDown",
+    "isometricLeftUp",
+    "isometricLeftDown",
+    "isometricRightUp",
+    "isometricRightDown",
+    "isometricOffAxis1Left",
+    "isometricOffAxis1Right",
+    "isometricOffAxis1Top",
+    "isometricOffAxis2Left",
+    "isometricOffAxis2Right",
+    "isometricOffAxis2Top",
+    "isometricOffAxis3Left",
+    "isometricOffAxis3Right",
+    "isometricOffAxis3Bottom",
+    "isometricOffAxis4Left",
+    "isometricOffAxis4Right",
+    "isometricOffAxis4Bottom",
+    "obliqueTopLeft",
+    "obliqueTop",
+    "obliqueTopRight",
+    "obliqueLeft",
+    "obliqueRight",
+    "obliqueBottomLeft",
+    "obliqueBottom",
+    "obliqueBottomRight",
+    "perspectiveFront",
+    "perspectiveLeft",
+    "perspectiveRight",
+    "perspectiveAbove",
+    "perspectiveBelow",
+    "perspectiveAboveLeftFacing",
+    "perspectiveAboveRightFacing",
+    "perspectiveContrastingLeftFacing",
+    "perspectiveContrastingRightFacing",
+    "perspectiveHeroicLeftFacing",
+    "perspectiveHeroicRightFacing",
+    "perspectiveHeroicExtremeLeftFacing",
+    "perspectiveHeroicExtremeRightFacing",
+    "perspectiveRelaxed",
+    "perspectiveRelaxedModerately",
+];
+
+/// Every light rig the file format defines (`ST_LightRigType`).
+pub const ALL_LIGHTS: &[&str] = &[
+    "legacyFlat1",
+    "legacyFlat2",
+    "legacyFlat3",
+    "legacyFlat4",
+    "legacyNormal1",
+    "legacyNormal2",
+    "legacyNormal3",
+    "legacyNormal4",
+    "legacyHarsh1",
+    "legacyHarsh2",
+    "legacyHarsh3",
+    "legacyHarsh4",
+    "threePt",
+    "balanced",
+    "soft",
+    "harsh",
+    "flood",
+    "contrasting",
+    "morning",
+    "sunrise",
+    "sunset",
+    "chilly",
+    "freezing",
+    "flat",
+    "twoPt",
+    "glow",
+    "brightRoom",
+];
+
+/// Light rig directions (`ST_LightRigDirection`).
+pub const LIGHT_DIRS: &[&str] = &["tl", "t", "tr", "l", "r", "bl", "b", "br"];
+
+/// Every material the file format defines (`ST_PresetMaterialType`).
+pub const ALL_MATERIALS: &[&str] = &[
+    "legacyMatte",
+    "legacyPlastic",
+    "legacyMetal",
+    "legacyWireframe",
+    "matte",
+    "plastic",
+    "metal",
+    "warmMatte",
+    "translucentPowder",
+    "powder",
+    "dkEdge",
+    "softEdge",
+    "clear",
+    "flat",
+    "softmetal",
+];
+
 /// One bevel: preset, width and height in points.
 #[derive(Clone, Debug, PartialEq)]
 pub struct Bevel {
@@ -107,92 +227,54 @@ impl Default for Shape3d {
     }
 }
 
-/// The start tags of `raw` as (local name, tag text), in order.
-fn tags(raw: &str) -> Vec<(&str, &str)> {
-    let mut out = Vec::new();
-    let mut rest = raw;
-    while let Some(i) = rest.find('<') {
-        let Some(t) = rest.get(i + 1..) else { break };
-        let end = t.find('>').unwrap_or(t.len());
-        let tag = t.get(..end).unwrap_or("");
-        rest = t.get(end..).unwrap_or("");
-        if tag.starts_with('/') || tag.starts_with('?') || tag.starts_with('!') {
-            continue;
-        }
-        let name = tag.split(|c: char| c.is_whitespace() || c == '/').next().unwrap_or("");
-        let local = name.rsplit(':').next().unwrap_or(name);
-        out.push((local, tag));
-    }
-    out
-}
-
-fn attr<'a>(tag: &'a str, name: &str) -> Option<&'a str> {
-    let key = format!(" {name}=\"");
-    let s = tag.find(&key)? + key.len();
-    let rest = tag.get(s..)?;
-    rest.get(..rest.find('"')?)
-}
-
-fn num(tag: &str, name: &str) -> Option<f64> {
-    attr(tag, name).and_then(|v| v.parse::<f64>().ok()).filter(|v| v.is_finite())
-}
-
 const EMU: f64 = 12700.0;
 const ANGLE: f64 = 60000.0;
+/// Largest length kept, in points (PowerPoint's own limit).
+const MAX_PT: f64 = 1584.0;
 
-/// An `a:`-prefixed element `local` (with its children) cut from `raw`, if there is one.
-fn element(raw: &str, local: &str) -> Option<String> {
-    let open = format!("<a:{local}");
-    let close = format!("</a:{local}>");
-    let i = raw.find(&open)?;
-    let j = raw.get(i..)?.find(&close)? + i + close.len();
-    raw.get(i..j).map(str::to_string)
+/// `value` when it is one of `known`, else `default`. Values from a file are written back into
+/// XML as they are, so nothing outside these lists may pass.
+fn known(value: Option<&str>, known: &[&str], default: &str) -> String {
+    value.filter(|v| known.contains(v)).unwrap_or(default).to_string()
+}
+
+fn num(e: &deckcraft_pptx::XmlEl, name: &str) -> Option<f64> {
+    e.attr(name).and_then(|v| v.trim().parse::<f64>().ok()).filter(|v| v.is_finite())
 }
 
 impl Shape3d {
-    /// Reads kept 3-D XML; unknown parts take their defaults.
+    /// Reads kept 3-D XML (`a:scene3d` and `a:sp3d`); unknown or invalid parts take their defaults.
     pub fn parse(raw: &str) -> Shape3d {
         let mut s = Shape3d::default();
-        let mut in_camera = false;
-        for (name, tag) in tags(raw) {
-            match name {
-                "camera" => {
-                    s.camera = attr(tag, "prst").unwrap_or("orthographicFront").to_string();
-                    in_camera = !tag.ends_with('/');
-                }
-                "rot" if in_camera => {
-                    let d = |n| num(tag, n).unwrap_or(0.0) / ANGLE;
-                    s.rot = Some((d("lon"), d("lat"), d("rev")));
-                    in_camera = false;
-                }
-                "lightRig" => {
-                    in_camera = false;
-                    s.light = attr(tag, "rig").unwrap_or("threePt").to_string();
-                    s.light_dir = attr(tag, "dir").unwrap_or("t").to_string();
-                }
-                "sp3d" => {
-                    in_camera = false;
-                    s.depth = num(tag, "extrusionH").unwrap_or(0.0) / EMU;
-                    s.contour = num(tag, "contourW").unwrap_or(0.0) / EMU;
-                    s.z = num(tag, "z").unwrap_or(0.0) / EMU;
-                    s.material = attr(tag, "prstMaterial").unwrap_or("warmMatte").to_string();
-                }
-                "bevelT" | "bevelB" => {
-                    let b = Bevel {
-                        preset: attr(tag, "prst").unwrap_or("circle").to_string(),
-                        w: num(tag, "w").unwrap_or(76200.0) / EMU,
-                        h: num(tag, "h").unwrap_or(76200.0) / EMU,
-                    };
-                    if name == "bevelT" {
-                        s.top = Some(b);
-                    } else {
-                        s.bottom = Some(b);
-                    }
-                }
-                _ => {}
+        let Ok(doc) = deckcraft_pptx::parse_xml(format!("<r>{raw}</r>").as_bytes()) else { return s };
+        let root = &doc.root;
+        if let Some(cam) = root.path(&["scene3d", "camera"]) {
+            s.camera = known(cam.attr("prst"), ALL_CAMERAS, "orthographicFront");
+            if let Some(rot) = cam.child("rot") {
+                let d = |n| num(rot, n).unwrap_or(0.0) / ANGLE;
+                s.rot = Some((d("lon"), d("lat"), d("rev")));
             }
         }
-        s.colors = ["extrusionClr", "contourClr"].iter().filter_map(|n| element(raw, n)).collect();
+        if let Some(l) = root.path(&["scene3d", "lightRig"]) {
+            s.light = known(l.attr("rig"), ALL_LIGHTS, "threePt");
+            s.light_dir = known(l.attr("dir"), LIGHT_DIRS, "t");
+        }
+        if let Some(sp) = root.child("sp3d") {
+            let pt = |n, lo: f64| (num(sp, n).unwrap_or(0.0) / EMU).clamp(lo, MAX_PT);
+            s.depth = pt("extrusionH", 0.0);
+            s.contour = pt("contourW", 0.0);
+            s.z = pt("z", -MAX_PT);
+            s.material = known(sp.attr("prstMaterial"), ALL_MATERIALS, "warmMatte");
+            for (name, slot) in [("bevelT", &mut s.top), ("bevelB", &mut s.bottom)] {
+                if let Some(b) = sp.child(name) {
+                    let len = |n| (num(b, n).unwrap_or(76200.0) / EMU).clamp(0.0, MAX_PT);
+                    *slot = Some(Bevel { preset: known(b.attr("prst"), BEVELS, "circle"), w: len("w"), h: len("h") });
+                }
+            }
+            // Colours are re-serialized by the XML writer (escaped); only `a:`-prefixed ones,
+            // since they are written back inside our own `a:sp3d`.
+            s.colors = sp.elements().filter(|c| (c.is("extrusionClr") || c.is("contourClr")) && c.prefix() == "a").map(|c| c.to_xml()).collect();
+        }
         s
     }
 
@@ -302,3 +384,49 @@ pub fn store(e: &mut deckcraft_model::Effects, s: &Shape3d) {
     e.raw3d = s.to_xml();
     e.bevel = if e.raw3d.is_some() { s.top.as_ref().map(|b| b.preset.clone()) } else { None };
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const NS: &str = r#"xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main""#;
+
+    /// Preset names from a file are written back into XML; anything outside the format's lists
+    /// (here, values that would close the tag and inject markup once unescaped) falls back to the
+    /// default instead.
+    #[test]
+    fn unknown_presets_from_a_file_are_not_written_back() {
+        let evil = "x&quot;/&gt;&lt;a:evil/&gt;";
+        let raw = format!(
+            r#"<a:scene3d {NS}><a:camera prst="{evil}"/><a:lightRig rig="{evil}" dir="{evil}"/></a:scene3d><a:sp3d {NS} extrusionH="12700" prstMaterial="{evil}"><a:bevelT w="25400" h="25400" prst="{evil}"/><a:extrusionClr><a:srgbClr val="{evil}"/></a:extrusionClr></a:sp3d>"#
+        );
+        let s = Shape3d::parse(&raw);
+        assert_eq!(
+            (s.camera.as_str(), s.light.as_str(), s.light_dir.as_str(), s.material.as_str()),
+            ("orthographicFront", "threePt", "t", "warmMatte")
+        );
+        assert_eq!(s.top.as_ref().map(|b| b.preset.as_str()), Some("circle"));
+        assert_eq!(s.depth, 1.0);
+        let xml = s.to_xml().expect("not flat");
+        assert!(!xml.contains("<a:evil"), "{xml}");
+        // What is written is well-formed XML with the colour's value escaped.
+        let doc = deckcraft_pptx::parse_xml(format!("<r {NS}>{xml}</r>").as_bytes()).expect("well-formed");
+        assert_eq!(doc.root.path(&["sp3d", "extrusionClr", "srgbClr"]).and_then(|c| c.attr("val")), Some(r#"x"/><a:evil/>"#));
+    }
+
+    #[test]
+    fn known_presets_round_trip() {
+        let raw = format!(
+            r#"<a:scene3d {NS}><a:camera prst="legacyObliqueTopLeft"><a:rot lat="1200000" lon="600000" rev="0"/></a:camera><a:lightRig rig="legacyHarsh2" dir="tl"/></a:scene3d><a:sp3d {NS} z="-12700" contourW="12700" prstMaterial="legacyMetal"><a:bevelB w="38100" h="12700" prst="artDeco"/></a:sp3d>"#
+        );
+        let s = Shape3d::parse(&raw);
+        assert_eq!(s.camera, "legacyObliqueTopLeft");
+        assert_eq!(s.rot, Some((10.0, 20.0, 0.0)));
+        assert_eq!((s.light.as_str(), s.light_dir.as_str(), s.material.as_str()), ("legacyHarsh2", "tl", "legacyMetal"));
+        assert_eq!((s.z, s.contour), (-1.0, 1.0));
+        assert_eq!(s.bottom, Some(Bevel { preset: "artDeco".into(), w: 3.0, h: 1.0 }));
+        assert_eq!(Shape3d::parse(&s.to_xml().expect("3-D")), s);
+        // Not XML at all: defaults.
+        assert_eq!(Shape3d::parse("<a:scene3d><a:camera"), Shape3d::default());
+    }
+}
diff --git a/crates/pptx/src/lib.rs b/crates/pptx/src/lib.rs
index 770963bd..ec37b764 100644
--- a/crates/pptx/src/lib.rs
+++ b/crates/pptx/src/lib.rs
@@ -18,6 +18,10 @@ mod tables;
 mod write;
 mod xml;
 
+/// The bounded XML reader the importer uses, for callers that read kept fragments (a shape's
+/// 3-D settings) instead of scanning strings.
+pub use xml::{Doc as XmlDoc, El as XmlEl, parse as parse_xml};
+
 use deckcraft_model::Presentation;
 
 /// Extension URI of the PowerPoint 2010 section list in `presentation.xml`.
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index 9f65f61e..b9196b86 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -94,11 +94,7 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 
 | Pane / dialog | PowerPoint | DeckCraft |
 |---|---|---|
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line (dash, compound, cap, join, begin/end arrows and sizes), some effects, size (lock aspect ratio); no 3-D, thin picture/texture options |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, shadow/glow/reflection details (colour, transparency, blur, angle, distance, size), soft edges, size; no 3-D, thin picture/texture options |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill (solid transparency follows the selection), gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, picture/texture fill (source, tile, offsets, scale, alignment, mirror, transparency, rotate with shape), line, some effects, size; no 3-D |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, some effects, 3-D format and rotation (bevels, depth, contour, material, lighting, camera presets, X/Y/Z rotation), size; thin picture/texture options |
+| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill (solid transparency follows the selection), gradient editor, picture/texture fill (source, tile, offsets, scale, alignment, mirror, transparency, rotate with shape), line (dash, compound, cap, join, begin/end arrows and sizes), shadow/glow/reflection details (colour, transparency, blur, angle, distance, size), soft edges, 3-D format and rotation (bevels, depth, contour, material, lighting, camera presets, X/Y/Z rotation), size (lock aspect ratio) |
 | Format Background pane | yes | yes |
 | Slide Master | Insert Layout, Rename, Delete, Preserve, Insert Placeholder, Title and Footers | Insert Layout, Rename, Delete, Insert Placeholder, and Preserve, Title and Footers checkboxes (`master.preserve`, `master.placeholders`). A master thumbnail selects the master |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |

From a7d47dbc1b739a1aed597768340368dd05830271 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:47:24 -0400
Subject: [PATCH 369/376] Fix up #488: background opens enter the session
 through file.adopt

The progress window's result was added with add_presentation_file, straight
into the session: not journaled and outside the command panic guard that
file.open runs under. The host now hands the loaded file to
Session::stage_loaded and runs the new internal command file.adopt {path,
token}, which shares file.open's tail (repaired-copy handling, damaged-media
report) and so is journaled and guarded. Without the staged copy (a replayed
journal, a stale token) file.adopt reads path like file.open. Reading still
happens on the background thread.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/file.rs | 42 +++++++++++++++++++++++++++--------
 crates/engine/src/lib.rs      | 22 ++++++++++++++++++
 crates/engine/src/tests.rs    | 32 ++++++++++++++++++++++++++
 crates/ui-egui/src/opening.rs | 14 ++++++++----
 4 files changed, 97 insertions(+), 13 deletions(-)

diff --git a/crates/engine/src/cmd/file.rs b/crates/engine/src/cmd/file.rs
index aa0b4719..3a24f70a 100644
--- a/crates/engine/src/cmd/file.rs
+++ b/crates/engine/src/cmd/file.rs
@@ -19,6 +19,15 @@ pub fn specs() -> Vec<CommandSpec> {
         ),
         cmd!(query "file.templates", "Starter Templates", [], None, "{} → [{name, summary, theme, slides}]", always, templates),
         cmd!(noundo "file.open", "Open…", ["File"], Some("Cmd+O"), "{path}", always, open),
+        cmd!(
+            noundo "file.adopt",
+            "Open",
+            [],
+            None,
+            "{path, token?} (a presentation the host read in the background and staged with Session::stage_loaded; without one, reads path like file.open)",
+            always,
+            adopt
+        ),
         cmd!(noundo "file.openBytes", "Open Data", [], None, "{name, data: base64}", always, open_bytes),
         cmd!(noundo "file.save", "Save", ["File"], Some("Cmd+S"), "{path?, format?: deckcraft|pptx}", has_doc, save),
         cmd!(noundo "file.saveAs", "Save As…", ["File"], Some("Cmd+Shift+S"), "{path, format?}", has_doc, save_as),
@@ -163,8 +172,8 @@ pub fn add_opened(s: &mut Session, name: &str, path: Option<String>, p: Presenta
 }
 
 /// A presentation read from disk, not yet added to a session: [`read_presentation_file`] needs no
-/// session, so a host can run it on a background thread and add the result with
-/// [`add_presentation_file`].
+/// session, so a host can run it on a background thread, hand the result to
+/// [`Session::stage_loaded`] and add it with `file.adopt`.
 #[derive(Debug)]
 pub struct LoadedFile {
     pub path: String,
@@ -184,22 +193,37 @@ pub fn read_presentation_file(path: &str) -> Result<LoadedFile> {
     Ok(LoadedFile { path: path.to_string(), doc, native, damaged })
 }
 
-/// Add a presentation read by [`read_presentation_file`] as the active document. A damaged file
-/// opens as an untitled repaired copy, so Save can't overwrite the original with the empty media.
-pub fn add_presentation_file(s: &mut Session, f: LoadedFile) -> Result<(usize, Vec<String>)> {
+/// Add a loaded presentation as the active document: the shared end of `file.open` and
+/// `file.adopt`. A damaged file opens as an untitled repaired copy, so Save can't overwrite the
+/// original with the empty media.
+fn adopt_loaded(s: &mut Session, f: LoadedFile) -> Result<Value> {
     let LoadedFile { path, doc, native, damaged } = f;
     let keep_path = native && damaged.is_empty();
     let i = add_opened(s, &path, keep_path.then(|| path.clone()), doc);
     report_damage(s, &damaged)?;
-    Ok((i, damaged))
+    let st = s.doc()?;
+    Ok(json!({"document": i, "slides": st.doc.slides.len(), "missingFonts": st.missing_fonts, "damagedMedia": damaged}))
 }
 
 #[cfg(not(target_arch = "wasm32"))]
 fn open(s: &mut Session, p: &Value) -> Result<Value> {
     let path = str_param(p, "path").ok_or_else(|| bad("file.open", "missing `path`"))?;
-    let (i, damaged) = add_presentation_file(s, read_presentation_file(path)?)?;
-    let st = s.doc()?;
-    Ok(json!({"document": i, "slides": st.doc.slides.len(), "missingFonts": st.missing_fonts, "damagedMedia": damaged}))
+    adopt_loaded(s, read_presentation_file(path)?)
+}
+
+/// `file.adopt {path, token?}`: add the presentation a host read in the background and staged
+/// with [`Session::stage_loaded`]. Without that staged file (a replayed journal, a stale token)
+/// it reads `path` like `file.open`, so the journal entry stays replayable.
+fn adopt(s: &mut Session, p: &Value) -> Result<Value> {
+    let path = str_param(p, "path").ok_or_else(|| bad("file.adopt", "missing `path`"))?;
+    let staged = p.get("token").and_then(Value::as_u64).and_then(|t| s.take_loaded(t)).filter(|f| f.path == path);
+    match staged {
+        Some(f) => adopt_loaded(s, f),
+        #[cfg(not(target_arch = "wasm32"))]
+        None => adopt_loaded(s, read_presentation_file(path)?),
+        #[cfg(target_arch = "wasm32")]
+        None => Err(bad("file.adopt", format!("{path} was not loaded"))),
+    }
 }
 #[cfg(target_arch = "wasm32")]
 fn open(_s: &mut Session, _p: &Value) -> Result<Value> {
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index 60eebaf8..29fae722 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -470,6 +470,9 @@ pub struct Session {
     pub mac_keys: bool,
     /// Command panics caught by the guard (the document was rolled back); soak tests require 0.
     pub panics_caught: u64,
+    /// Presentations a host read off the UI thread, waiting for `file.adopt` (by token).
+    loaded: Vec<(u64, cmd::file::LoadedFile)>,
+    next_loaded: u64,
 }
 
 impl Default for Session {
@@ -499,8 +502,27 @@ impl Session {
             gif_paused: Default::default(),
             mac_keys: cfg!(target_os = "macos"),
             panics_caught: 0,
+            loaded: vec![],
+            next_loaded: 0,
         }
     }
+    /// Hand over a presentation read on another thread ([`cmd::file::read_presentation_file`]);
+    /// `file.adopt` with the returned token adds it as a document, through the command path like
+    /// `file.open` (journaled, panic-guarded). Only the latest few wait; older ones are dropped.
+    pub fn stage_loaded(&mut self, f: cmd::file::LoadedFile) -> u64 {
+        const KEEP: usize = 4;
+        self.next_loaded = self.next_loaded.wrapping_add(1);
+        if self.loaded.len() >= KEEP {
+            self.loaded.remove(0);
+        }
+        self.loaded.push((self.next_loaded, f));
+        self.next_loaded
+    }
+    /// The staged presentation for `token`, removed from the session.
+    pub(crate) fn take_loaded(&mut self, token: u64) -> Option<cmd::file::LoadedFile> {
+        let i = self.loaded.iter().position(|(t, _)| *t == token)?;
+        Some(self.loaded.remove(i).1)
+    }
     /// A session with one new presentation open.
     pub fn with_new() -> Self {
         let mut s = Self::new();
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index a4359ee8..e55127e0 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -2739,3 +2739,35 @@ fn three_d_reset_and_flat_shapes_drop_the_xml() {
     s3.apply(&json!({"depth": 3}));
     assert!(s3.to_xml().unwrap().contains("<a:extrusionClr><a:srgbClr val=\"FF0000\"/></a:extrusionClr>"));
 }
+
+/// A presentation read off the UI thread enters the session through `file.adopt`: journaled like
+/// `file.open`, and replayable from the journal without the staged copy.
+#[cfg(not(target_arch = "wasm32"))]
+#[test]
+fn background_loads_are_adopted_through_a_command() {
+    let mut src = Session::with_new();
+    src.execute("slide.new", &json!({})).unwrap();
+    let path = std::env::temp_dir().join(format!("deckcraft-adopt-{}.deckcraft", std::process::id()));
+    let path = path.to_string_lossy().to_string();
+    src.execute("file.saveAs", &json!({"path": path})).unwrap();
+
+    let mut s = Session::new();
+    let loaded = cmd::file::read_presentation_file(&path).unwrap();
+    let token = s.stage_loaded(loaded);
+    let r = s.execute("file.adopt", &json!({"path": path, "token": token})).unwrap();
+    assert_eq!(r["slides"], 2, "{r}");
+    assert_eq!(s.documents().len(), 1);
+    assert_eq!(s.doc().unwrap().path.as_deref(), Some(path.as_str()));
+    let (id, params) = s.journal.last().cloned().unwrap();
+    assert_eq!(id, "file.adopt");
+    // The token was used up; replaying the entry reads the file again.
+    let mut replay = Session::new();
+    replay.execute(&id, &params).unwrap();
+    assert_eq!(replay.doc().unwrap().doc.slides.len(), 2);
+    // A token staged for another path is not taken for this one.
+    let other = s.stage_loaded(cmd::file::LoadedFile { path: "/elsewhere.pptx".into(), doc: Default::default(), native: true, damaged: vec![] });
+    s.execute("file.adopt", &json!({"path": path, "token": other})).unwrap();
+    assert_eq!(s.doc().unwrap().doc.slides.len(), 2);
+    assert!(s.execute("file.adopt", &json!({})).is_err());
+    std::fs::remove_file(&path).ok();
+}
diff --git a/crates/ui-egui/src/opening.rs b/crates/ui-egui/src/opening.rs
index d48734ec..debeb03c 100644
--- a/crates/ui-egui/src/opening.rs
+++ b/crates/ui-egui/src/opening.rs
@@ -71,10 +71,14 @@ impl SlideApp {
         };
         let Some(o) = self.opening.take() else { return };
         match r {
-            Ok(f) => match deckcraft_engine::cmd::file::add_presentation_file(&mut self.session, f) {
-                Ok(_) => self.note_recent(&o.path),
-                Err(e) => self.set_status(e.to_string()),
-            },
+            Ok(f) => {
+                // Into the session through the command path, like file.open: journaled and guarded.
+                let token = self.session.stage_loaded(f);
+                match self.session.execute("file.adopt", &serde_json::json!({"path": o.path, "token": token})) {
+                    Ok(_) => self.note_recent(&o.path),
+                    Err(e) => self.set_status(e.to_string()),
+                }
+            }
             Err(e) => self.set_status(e),
         }
     }
@@ -144,6 +148,8 @@ mod tests {
         assert_eq!(app.session.documents().len(), 1);
         assert_eq!(app.session.active().unwrap().doc.slides.len(), 3);
         assert_eq!(app.ui.recent.first(), Some(&path));
+        // It went in through the command path (journaled like file.open).
+        assert_eq!(app.session.journal.last().map(|(id, _)| id.as_str()), Some("file.adopt"));
         std::fs::remove_file(&path).ok();
     }
 

From 76978b1634e5a8670461e84050a7dfc49c86b2e7 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:50:07 -0400
Subject: [PATCH 370/376] Fix up merged PRs: a background open that fails says
 why on the start screen

Main (#346) shows why a file couldn't be opened as a notice over the start
screen; #488's background open put the error in the status bar instead, which
broke a_file_that_cant_be_opened_says_why. The background open now reports
through the same notice, and the test waits for the background read.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/backstage_tests.rs |  9 +++++++++
 crates/ui-egui/src/opening.rs         | 13 +++++++------
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/crates/ui-egui/src/backstage_tests.rs b/crates/ui-egui/src/backstage_tests.rs
index e0f4e6d2..9b3906a2 100644
--- a/crates/ui-egui/src/backstage_tests.rs
+++ b/crates/ui-egui/src/backstage_tests.rs
@@ -444,6 +444,15 @@ fn a_file_that_cant_be_opened_says_why() {
     h.run_steps(2);
     h.get_by_label("Browse").click();
     h.run_steps(3);
+    // The file is read in the background (#350): wait for it.
+    for _ in 0..500 {
+        if h.state().opening.is_none() {
+            break;
+        }
+        std::thread::sleep(std::time::Duration::from_millis(10));
+        h.run_steps(1);
+    }
+    h.run_steps(2);
     assert!(h.state().session.documents().is_empty());
     assert!(h.query_by_label_contains("not a presentation DeckCraft can read").is_some(), "the error is on screen");
     let _ = std::fs::remove_dir_all(&dir);
diff --git a/crates/ui-egui/src/opening.rs b/crates/ui-egui/src/opening.rs
index debeb03c..37d20a4e 100644
--- a/crates/ui-egui/src/opening.rs
+++ b/crates/ui-egui/src/opening.rs
@@ -32,7 +32,7 @@ impl SlideApp {
         #[cfg(target_arch = "wasm32")]
         {
             if let Err(e) = self.open_path(path) {
-                self.set_status(e);
+                self.notify(e);
             }
         }
         #[cfg(not(target_arch = "wasm32"))]
@@ -47,7 +47,7 @@ impl SlideApp {
                 Ok(_) => self.opening = Some(Opening { path: path.to_string(), started_ms: crate::now_ms(), rx }),
                 Err(_) => {
                     if let Err(e) = self.open_path(path) {
-                        self.set_status(e);
+                        self.notify(e);
                     }
                 }
             }
@@ -76,10 +76,11 @@ impl SlideApp {
                 let token = self.session.stage_loaded(f);
                 match self.session.execute("file.adopt", &serde_json::json!({"path": o.path, "token": token})) {
                     Ok(_) => self.note_recent(&o.path),
-                    Err(e) => self.set_status(e.to_string()),
+                    Err(e) => self.notify(e.to_string()),
                 }
             }
-            Err(e) => self.set_status(e),
+            // Over the start screen too, like a failed file.open (#346).
+            Err(e) => self.notify(e),
         }
     }
 
@@ -167,14 +168,14 @@ mod tests {
     }
 
     #[test]
-    fn errors_show_in_the_status_bar_and_a_second_open_waits() {
+    fn errors_are_shown_and_a_second_open_waits() {
         let mut app = SlideApp::new(Session::new(), crate::Services::default());
         app.open_path_in_background("/nonexistent/deckcraft/missing.pptx");
         app.open_path_in_background("/nonexistent/deckcraft/other.pptx");
         assert!(app.status.as_ref().is_some_and(|(m, _)| m.starts_with("Still opening missing.pptx")));
         wait(&mut app);
         assert!(app.session.documents().is_empty());
-        assert!(app.status.as_ref().is_some_and(|(m, _)| m.contains("missing.pptx")), "{:?}", app.status);
+        assert!(app.toast.as_ref().is_some_and(|t| t.text.contains("missing.pptx")), "the reason is shown");
     }
 
     #[test]

From 10eb4866d966b872c54fe6dc2a4dced3b66d89ff Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:53:57 -0400
Subject: [PATCH 371/376] Fix up merged PRs: the media walker counts #209's
 kept object parts

SmartArt and OLE objects now keep their parts as media items
(ShapeKind::Opaque::parts). media_refs visits them, so slide.reuse copies them
and picture.compress never deletes them; the Opaque arm names every field so a
new one can't be missed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/media_refs.rs | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/crates/engine/src/media_refs.rs b/crates/engine/src/media_refs.rs
index 33bc6a37..a4e17453 100644
--- a/crates/engine/src/media_refs.rs
+++ b/crates/engine/src/media_refs.rs
@@ -4,7 +4,7 @@
 //! rewrites them in place. It covers pictures (and their artistic-effect originals), picture fills
 //! wherever a fill can sit (shapes, lines, text runs, table cells and styles, chart series and
 //! points, backgrounds, theme format schemes), media clips and their posters, 3-D models, OLE and
-//! SmartArt previews, SmartArt node pictures, picture bullets, hyperlink, transition and
+//! SmartArt previews and kept parts, SmartArt node pictures, picture bullets, hyperlink, transition and
 //! animation sounds, and embedded font faces. Adding a `MediaId` field to the model means adding
 //! it here; the shape kinds are matched exhaustively so a new kind can't be missed.
 
@@ -164,10 +164,15 @@ macro_rules! walkers {
                         f(p);
                     }
                 }
-                ShapeKind::Opaque { preview, .. } => {
+                // Every field named, so a new one can't slip past.
+                ShapeKind::Opaque { xml: _, preview, label: _, parts } => {
                     if let Some(p) = preview {
                         f(p);
                     }
+                    // SmartArt data, OLE embeddings… kept as media items (#209).
+                    for (_, _, id) in parts {
+                        f(id);
+                    }
                 }
             }
             opt_fill(&$($m)? s.fill, f);
@@ -387,4 +392,19 @@ mod tests {
         got.sort();
         assert_eq!(got, (9101..=9108).map(MediaId).collect::<Vec<_>>());
     }
+
+    /// SmartArt and OLE objects keep their parts as media items (#209); those count as used.
+    #[test]
+    fn kept_parts_of_unmodelled_objects_are_references() {
+        let opaque = Shape {
+            kind: ShapeKind::Opaque {
+                xml: String::new(),
+                preview: Some(MediaId(9101)),
+                label: "object".into(),
+                parts: vec![("rId2".into(), "oleObject".into(), MediaId(9102))],
+            },
+            ..Default::default()
+        };
+        assert_eq!(shapes_media(std::slice::from_ref(&opaque)), vec![MediaId(9101), MediaId(9102)]);
+    }
 }

From 5006f4cc842fcaf78225396c5b45db91035d99b7 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 15:56:55 -0400
Subject: [PATCH 372/376] Fix up merged PRs: slide.reuse's params doc uses
 commas

The landing branch checks that every params doc parses into its keys; #509's
used `;` between keys, which that parser rejects.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/reuse.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/engine/src/cmd/reuse.rs b/crates/engine/src/cmd/reuse.rs
index 1025b01e..bcdc5f7c 100644
--- a/crates/engine/src/cmd/reuse.rs
+++ b/crates/engine/src/cmd/reuse.rs
@@ -20,7 +20,7 @@ pub fn specs() -> Vec<CommandSpec> {
         "Reuse Slides…",
         ["Home", "Slides", "New Slide"],
         None,
-        "{path? | data: base64, name?; slides?: [index] (0-based, default all); keepFormatting?: bool (default false: use the destination theme); at?: index (default after the current slide)}",
+        "{path? | data: base64, name?, slides?: [index] (0-based, default all), keepFormatting?: bool (default false: use the destination theme), at?: index (default after the current slide)}",
         has_doc,
         reuse
     )]

From 4517dd4e882db10080924219af15dc41f9914f37 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 16:13:37 -0400
Subject: [PATCH 373/376] Docs: fold the rows and headers the PR merges
 duplicated; parity summary regenerated

Union merges of the 2026-10-14 community PR wave stacked header lines and
left near-duplicate rows, bullets and paragraphs with per-PR counts. Each
progress doc now has one status line and one row per fact, with current
numbers: breadth 84% over 191 features (cargo xtask parity, after removing
duplicate Thesaurus/AutoCorrect/Artistic effects/Corrections checklist
rows), 320 engine commands, 41 dialogs, 1,641 tests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 README.md                  |   2 +-
 ROADMAP.md                 | 130 ++++++------------
 docs/animation-parity.md   |  12 +-
 docs/architecture.md       |  35 +----
 docs/file-format-parity.md |  42 +-----
 docs/gaps.md               | 264 +++++++++++--------------------------
 docs/hardware-parity.md    |  11 +-
 docs/parity-checklist.md   |  50 ++-----
 docs/roadmap.md            |  85 +++---------
 docs/slideshow-parity.md   |  22 +---
 docs/target-app-parity.md  | 134 ++++++-------------
 docs/ui-parity.md          |  86 +-----------
 12 files changed, 224 insertions(+), 649 deletions(-)

diff --git a/README.md b/README.md
index 073fa482..54b7aac4 100644
--- a/README.md
+++ b/README.md
@@ -155,7 +155,7 @@ deckcraft-cli mcp --automation-read-root DIR --automation-write-root DIR   # con
 
 ## Roadmap
 
-DeckCraft is in **alpha**. It covers **80% of PowerPoint's features by breadth** (92% of the core
+DeckCraft is in **alpha**. It covers **84% of PowerPoint's features by breadth** (92% of the core
 ones, measured) and is about **55% of the way to replacing PowerPoint for real work** (estimated).
 See [ROADMAP.md](ROADMAP.md) for the stage, numbers by dimension and what's next,
 [docs/target-app-parity.md](docs/target-app-parity.md) for the full assessment,
diff --git a/ROADMAP.md b/ROADMAP.md
index afae9ac4..9303bd70 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,48 +2,7 @@
 
 **Stage: alpha** · next: beta, ~20 points and ~120–210 h away
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (video-seek race fixed and regression-tested; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (presenter keyboard navigation; hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (SmartArt text on its text rectangle; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (title bar Export button; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (right click selects; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha; previous: major, full re-measure against PowerPoint for Mac 16.113.4; restructured to the craftrules progress-docs standard) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (progress log: codec parsers reject overflowing numeric fields, #426; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt Transform gallery; previous: hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (progress log: owned PPTX corpus round-trip, notes-master header and footer; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus for comments, links, custom shows, groups and inherited placeholders; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus for text effects, body layout, theme effects, fills, bevels and connectors; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: PPTX corpus for models, media and timing) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: chart trendlines round-trip; previous: minor, hours to ~95% per audience added; ready ~55%; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Lucide icon gallery; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Size and Position dialog; breadth stays 79%, ready stays ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: previous and next comment; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (View › New Window; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (six original starter decks; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: IME underlines in table cells; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog; breadth stays 79%, ready ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Edit Photo Album; breadth stays 79%, ready ~55%; previous: trivial, Photo Album dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors; breadth and ready percentages unchanged; previous: hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts; breadth and ready percentages unchanged; previous: hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Alt Text decorative checkbox; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Hyperlink dialog follows the selection; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Zoom dialog; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (progress log: owned PPTX corpus for more deck kinds, handout-master text; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Show Media Controls; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Design ▸ Effects; percentages unchanged) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; percentages unchanged; previous: hours to ~95% per audience, ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Trim Media dialog follows the selection; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: chart trendlines are drawn; previous: trivial, chart trendlines round-trip; hours to ~95% per audience added; ready ~55%; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Format Background picture options; percentages unchanged) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: copy and paste rich text and pictures with other apps; previous: hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (animation preview on the canvas; breadth 79% → 80%, Animations 79% → 85%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Format Shape fill transparency follows the selection; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (progress log: web file picker keeps its document and slide, #414; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Font dialog; previous: minor, hours to ~95% per audience added; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: Paragraph dialog; previous: trivial, Font dialog; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options dialog; previous: hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt adjust handles; previous: hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (progress log: pen pressure scales ink width; previous: minor, hours to ~95% per audience added; ready 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (unchanged charts keep their embedded workbook, #335) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** major (community PR wave 2026-10-14: ~60 landed items in the progress log, among them the Font, Paragraph, Photo Album, theme colour and font and Date and Time dialogs, presenter and show controls, the SmartArt Text Pane and PPTX corpus slices; breadth 84% after `cargo xtask parity`, ready stays ~55%, stage stays alpha; duplicated rows and headers folded; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 DeckCraft aims at full PowerPoint parity, and to be better: faster, open (a documented zip+JSON
 format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and available everywhere
@@ -55,9 +14,8 @@ format plus PPTX), scriptable by agents (CLI, JSON control channel, MCP), and av
 
 | | Value | Kind |
 |---|---|---|
-| **Feature breadth** | **79%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 39%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
-| **Feature breadth** | **80%** weighted over 191 PowerPoint features (P0 92%, P1 75%, P2 36%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
-| Menu-bar coverage | 59% of 217 app-specific PowerPoint menu items matched by name (lower bound) | measured: script over the PowerPoint menu dump and the 226 commands |
+| **Feature breadth** | **84%** weighted over 191 PowerPoint features (P0 92%, P1 82%, P2 55%) | measured: `cargo xtask parity` over [docs/parity-checklist.md](docs/parity-checklist.md) |
+| Menu-bar coverage | 59% of 217 app-specific PowerPoint menu items matched by name (lower bound) | measured: script over the PowerPoint menu dump and the 226 commands at d556ff9 (the registry has grown since; not re-measured) |
 | **Ready for real work** | **~55%** | estimated: weighted dimensions below |
 | Mainstream practitioner | ~53% | estimated: weekly-use areas × discounts for interaction (×0.92), stability (×0.92) and `.pptx` exchange (×0.88), [method](docs/target-app-parity.md#mainstream-practitioner-and-essentials-user) |
 | Essentials user | ~62% | estimated: core features × discounts for launch (×0.90), clarity (×0.95) and opening received files (×0.90), [method](docs/target-app-parity.md#mainstream-practitioner-and-essentials-user) |
@@ -87,7 +45,7 @@ EMF/SVG pictures, the data-loss and startup-crash bugs (#60, #40, #59) and the b
 
 | Dimension | Ready | Hours to full | Doc |
 |---|---:|---|---|
-| Features (breadth 80% measured, with depth) | ~62% | 140–240 | [docs/parity-checklist.md](docs/parity-checklist.md) |
+| Features (breadth 84% measured, with depth) | ~62% | 140–240 | [docs/parity-checklist.md](docs/parity-checklist.md) |
 | UI/UX fidelity | ~60% | 30–50 | [docs/ui-parity.md](docs/ui-parity.md) |
 | File formats (PPTX, PDF, legacy, export) | ~58% | 60–110 | [docs/file-format-parity.md](docs/file-format-parity.md) |
 | Hardware (GPU raster, video decode, displays, pens) | ~40% | 25–45 | [docs/hardware-parity.md](docs/hardware-parity.md) |
@@ -103,28 +61,26 @@ EMF/SVG pictures, the data-loss and startup-crash bugs (#60, #40, #59) and the b
 
 | Area | Breadth (measured) | Ready (est.) | Hours | Doc |
 |---|---:|---:|---|---|
-| Application shell | 71% | ~55% | 8–14 | [ui-parity](docs/ui-parity.md) |
-| Slides and sections | 90% | ~85% | 3–5 | [checklist](docs/parity-checklist.md) |
-| Views | 90% | ~80% | 3–6 | [ui-parity](docs/ui-parity.md) |
-| Masters and themes | 85% | ~70% | 8–14 | [checklist](docs/parity-checklist.md) |
-| Shapes | 86% | ~75% | 8–14 | [ui-parity](docs/ui-parity.md) |
-| Format (fill, line, effects) | 81% | ~65% | 8–14 | [ui-parity](docs/ui-parity.md) |
+| Application shell | 81% | ~55% | 8–14 | [ui-parity](docs/ui-parity.md) |
+| Slides and sections | 92% | ~85% | 3–5 | [checklist](docs/parity-checklist.md) |
+| Views | 98% | ~80% | 3–6 | [ui-parity](docs/ui-parity.md) |
+| Masters and themes | 92% | ~70% | 8–14 | [checklist](docs/parity-checklist.md) |
+| Shapes | 91% | ~75% | 8–14 | [ui-parity](docs/ui-parity.md) |
+| Format (fill, line, effects) | 83% | ~65% | 8–14 | [ui-parity](docs/ui-parity.md) |
 | Arrange | 100% | ~90% | 1–2 | [ui-parity](docs/ui-parity.md) |
-| Text | 80% | ~62% | 18–30 | [gaps](docs/gaps.md#features) |
-| Tables | 89% | ~75% | 3–6 | [checklist](docs/parity-checklist.md) |
+| Text | 83% | ~62% | 18–30 | [gaps](docs/gaps.md#features) |
+| Tables | 97% | ~75% | 3–6 | [checklist](docs/parity-checklist.md) |
 | Charts | 65% | ~45% | 12–20 | [gaps](docs/gaps.md#charts-data-grid-elements-and-the-newer-chart-types) |
-| SmartArt | 33% | ~25% | 10–16 | [gaps](docs/gaps.md#smartart-is-pre-drawn-shapes-only) |
-| Pictures | 48% | ~45% | 12–20 | [file formats](docs/file-format-parity.md) |
+| SmartArt | 50% | ~35% | 8–14 | [gaps](docs/gaps.md#smartart-editing-is-shallow) |
+| Pictures | 60% | ~45% | 12–20 | [file formats](docs/file-format-parity.md) |
 | Media | 67% | ~60% | 8–14 | [file formats](docs/file-format-parity.md) |
-| Transitions | 92% | ~80% | 4–8 | [animation-parity](docs/animation-parity.md) |
-| Animations | 79% | ~65% | 10–16 | [animation-parity](docs/animation-parity.md) |
-| Slide show and presenter view | 68% | ~60% | 10–16 | [slideshow-parity](docs/slideshow-parity.md) |
+| Transitions | 100% | ~80% | 4–8 | [animation-parity](docs/animation-parity.md) |
 | Animations | 85% | ~65% | 10–16 | [animation-parity](docs/animation-parity.md) |
-| Slide show and presenter view | 66% | ~60% | 10–16 | [slideshow-parity](docs/slideshow-parity.md) |
-| Review | 60% | ~45% | 8–14 | [gaps](docs/gaps.md) |
-| Draw (ink) | 33% | ~30% | 5–9 | [hardware-parity](docs/hardware-parity.md) |
-| Undo and clipboard | 88% | ~75% | 3–5 | [ui-parity](docs/ui-parity.md) |
-| Files (commands; formats above) | 69% | ~50% | in file formats | [file formats](docs/file-format-parity.md) |
+| Slide show and presenter view | 68% | ~60% | 10–16 | [slideshow-parity](docs/slideshow-parity.md) |
+| Review | 70% | ~45% | 8–14 | [gaps](docs/gaps.md) |
+| Draw (ink) | 50% | ~30% | 5–9 | [hardware-parity](docs/hardware-parity.md) |
+| Undo and clipboard | 100% | ~75% | 3–5 | [ui-parity](docs/ui-parity.md) |
+| Files (commands; formats above) | 75% | ~50% | in file formats | [file formats](docs/file-format-parity.md) |
 
 ## Languages
 
@@ -155,16 +111,11 @@ Ranked; detail and the full beta plan in [docs/roadmap.md](docs/roadmap.md).
 
 1. **No data loss, no startup crashes:** Close's save prompt (#60), Windows GPU crashes (#40, #59),
    image paste (#53), editor soak tests. 10–20 h.
-2. **PPTX on real decks:** a larger owned corpus and the remaining round-trip losses; #70, #74, #77;
-   EMF/WMF and SVG. 36–64 h.
-2. **PPTX on real decks:** owned corpus now covers comments, links and actions, custom shows,
-   rotated groups and placeholders that inherit from the layout. Still open: a larger corpus,
-   embedded fonts, #70, #74, #77, EMF/WMF and SVG. 36–64 h.
-2. **PPTX on real decks:** owned corpus now covers text effects, autofit, columns, vertical and
-   RTL text, tabs, line spacing, theme effects, fills, bevels and connectors. Still open: a larger
-   corpus, embedded fonts, #70, #74, #77, EMF/WMF and SVG. 36–64 h.
-2. **PPTX on real decks:** owned corpus, round-trip checks, fixes; #70, #74, #77; EMF/WMF and SVG.
-   `corpus_media.rs` keeps 3-D models and animation bounce end. 36–64 h.
+2. **PPTX on real decks:** the owned corpus now round-trips comments, links and actions, custom
+   shows, rotated groups, inherited placeholders, text effects and body layout, theme effects,
+   fills, bevels, connectors, tables, charts, animations, media, sections, masters, 3-D models
+   and animation bounce end. Still open: a corpus of real decks, #70, #74, #77, EMF+ records,
+   MicroType Express font subsets and SVG. 36–64 h.
 3. **Localization:** catalog, system language (#15), zh-Hans, es, fr, de, ja with IME. 27–46 h.
 4. **Output:** vector PDF, printing. 10–16 h.
 5. **Depth that users hit:** font weights (#69), chart data and elements, Animation Pane timeline,
@@ -196,43 +147,43 @@ app's JSON control channel (`deckcraft --control PORT`).
 | 2026-10-14 | Chart trendlines are drawn: linear, exponential, logarithmic, polynomial, power and moving average, with forecast and the equation and R² label. The value axis grows to include the fit |
 | 2026-10-14 | Chart trendlines round-trip (type, polynomial order, moving-average period, forecast, intercept, equation and R²). An owned corpus slice also checks combo charts with data labels, merged tables with diagonal borders, and text columns, autofit, vertical text and a WordArt warp |
 | 2026-10-14 | Insert › Icons: a gallery of Lucide stroke icons (release 1.56.0) inserted as custom shapes, no fill, round stroke scaled from the 24-unit design |
-| 2026-10-14 | Size and Position dialog: height, width, rotation, scale and lock aspect ratio in one undo step, from Shape Format › Size and the shape menu. Breadth stays 79% |
+| 2026-10-14 | Size and Position dialog: height, width, rotation, scale and lock aspect ratio in one undo step, from Shape Format › Size and the shape menu |
 | 2026-10-14 | Review: Previous and Next comment walk every comment in the deck; the Comments pane lists every slide and highlights the one you landed on |
 | 2026-10-13 | View › New Window opens a second window on the same presentation. The window has its own slide and shows edits made in the first window. Arrange All is not included |
 | 2026-10-14 | File › New starter decks: Briefing, Lesson, Pitch, Field Notes, Quarterly and Evening Talk, original text on our themes (`file.new {template}`, `file.templates`). The large template gallery is still open |
 | 2026-10-14 | Slide Sorter sections: Add Section, rename in place, collapse a section, and drag the bar to move that section and its slides |
 | 2026-10-14 | Text: an input method's composition in a table cell is underlined in place, with the caret and candidate window in that cell |
-| 2026-10-14 | Edit Photo Album (`insert.photoAlbumEdit`): reopen the album's slides and re-flow them in one undo step, with black and white, rotation, brightness, contrast and an album theme. Breadth stays 79%, ready ~55% |
-| 2026-10-14 | Photo Album dialog (`insert.photoAlbum`): pictures and text boxes become slides in the open presentation, one undo step. Breadth stays 79%, ready ~55% |
-| 2026-10-14 | Design › Colors › Customize Colors… opens Create New Theme Colors: the open master's scheme name and twelve theme colours, applied in one undo. Command count stays 226; dialogs 27 → 28 |
-| 2026-10-14 | Design › Fonts › Customize Fonts… opens Create New Theme Fonts: the open master's scheme name and its heading and body latin faces, applied in one undo. Command count stays 226; dialogs 27 → 28 |
+| 2026-10-14 | Edit Photo Album (`insert.photoAlbumEdit`): reopen the album's slides and re-flow them in one undo step, with black and white, rotation, brightness, contrast and an album theme |
+| 2026-10-14 | Photo Album dialog (`insert.photoAlbum`): pictures and text boxes become slides in the open presentation, one undo step |
+| 2026-10-14 | Design › Colors › Customize Colors… opens Create New Theme Colors: the open master's scheme name and twelve theme colours, applied in one undo |
+| 2026-10-14 | Design › Fonts › Customize Fonts… opens Create New Theme Fonts: the open master's scheme name and its heading and body latin faces, applied in one undo |
 | 2026-10-14 | Alt Text: Mark as decorative opens checked when the selection already is, so OK no longer clears it |
 | 2026-10-14 | Insert Hyperlink: address, email, slide and ScreenTip open from the selection, so OK no longer replaces them with `https://` and an empty tip |
-| 2026-10-14 | Insert › Date and Time: the ribbon and Insert menu open a format list (datetime1–datetime13) with a language and Update automatically. OK inserts one field, or the shown text when Update is off. 28 dialogs; 226 commands. English has every format; en-GB, French, Japanese and Swedish list the numeric date and 24-hour time |
+| 2026-10-14 | Insert › Date and Time: the ribbon and Insert menu open a format list (datetime1–datetime13) with a language and Update automatically. OK inserts one field, or the shown text when Update is off. English has every format; en-GB, French, Japanese and Swedish list the numeric date and 24-hour time |
 | 2026-10-14 | View: the Zoom dialog takes a percent or Fit and applies it on OK. View ▸ Zoom opens it; the arrow still lists the presets |
 | 2026-10-13 | PPTX corpus round-trip for tables, charts, animations, media, sections and masters/layouts (open → save → reopen, package parts and text). A handout master's header, footer, date and slide number are kept |
 | 2026-10-13 | Playback stays with its document and its clip (#415): switching decks or closing the last one stops the previous sound, replacing a clip plays the new one, and the duration and decode caches keep the bytes they are keyed by |
-| 2026-10-13 | Slide show: a laser pointer (Cmd/Ctrl+L, the show's laser colour, no ink). Checklist row Partial; weighted breadth stays 79%, P2 summary 39%, slide show area 68%. The presenter window does not move the dot |
+| 2026-10-13 | Slide show: a laser pointer (Cmd/Ctrl+L, the show's laser colour, no ink). Checklist row Partial. The presenter window does not move the dot |
 | 2026-10-14 | Slide Show: Show Media Controls writes the show setting and hides the playback bar and GIF button during the show |
-| 2026-10-14 | During a show, a typed slide number is shown and Enter goes to that slide. Breadth stays 79% |
-| 2026-10-14 | A custom show plays only its slides: Show in the Custom Shows dialog, Set Up Slide Show, or a click action. Breadth stays 79% |
-| 2026-10-14 | Presenter view pauses and resets its timer (T, R) and changes notes size (A-/A+, brackets). The clock shows local time. Second-display placement stays with #433. Breadth stays 79% |
-| 2026-10-14 | See All Slides and zoom during a show: a thumbnail grid (G, or All), click to jump, and click-to-zoom at 2× (Z). Presenter view has Black, White, All slides and Zoom. Breadth stays 79% |
+| 2026-10-14 | During a show, a typed slide number is shown and Enter goes to that slide |
+| 2026-10-14 | A custom show plays only its slides: Show in the Custom Shows dialog, Set Up Slide Show, or a click action |
+| 2026-10-14 | Presenter view pauses and resets its timer (T, R) and changes notes size (A-/A+, brackets). The clock shows local time. Second-display placement stays with #433 |
+| 2026-10-14 | See All Slides and zoom during a show: a thumbnail grid (G, or All), click to jump, and click-to-zoom at 2× (Z). Presenter view has Black, White, All slides and Zoom |
 | 2026-10-13 | The command palette skips commands that need a value, so searching for Export runs the export dialog (#79) |
 | 2026-10-14 | PNG and JPEG slide export record their resolution. The default 2 pixels per point is 144 dpi, so Preview and print show the slide's real size instead of twice that |
 | 2026-10-14 | Design ▸ Effects: named effect schemes (DeckCraft, Soft, Crisp, Lift, Glow, Plain) replace the theme's fills, lines and effects and leave colours and fonts. `design.effects` |
-| 2026-10-14 | Slide Master: Preserve on the open master or layout, and Title and Footers placeholder checkboxes. Two commands (`master.preserve`, `master.placeholders`); dialogs stay 27; breadth stays 79% |
+| 2026-10-14 | Slide Master: Preserve on the open master or layout, and Title and Footers placeholder checkboxes. Two commands (`master.preserve`, `master.placeholders`) |
 | 2026-10-14 | Trim Media: start, end and fades open from the selected clip, so OK no longer resets them to zero |
 | 2026-10-14 | Format Background: a solid fill's transparency, and for a picture transparency, tile, offset, scale, alignment and mirror. Apply to All copies a picture background onto every slide. The same `design.background` command; dialogs stay 27 |
 | 2026-10-13 | Editor slide rasters sit on the physical pixel grid, so small text stays sharp on a Retina display instead of being blurred by a linear filter between pixels (#184) |
 | 2026-10-14 | Copy and paste with other apps: bold, italic and underline travel as HTML (Pages keeps them); a shape with no text still copies as DeckCraft objects so Ctrl+V pastes it (#182) |
-| 2026-10-13 | Animations ▸ Preview plays the current slide's animations on the editor canvas (Play All does the same); Escape or a click stops it. Breadth 79% → 80%, Animations 79% → 85% |
+| 2026-10-13 | Animations ▸ Preview plays the current slide's animations on the editor canvas (Play All does the same); Escape or a click stops it. Checklist row Preview in editor re-scored done |
 | 2026-10-14 | A two-finger twist on the trackpad rotates the selected shapes, as one undo step. Pinch-zoom is unchanged |
 | 2026-10-14 | A trackpad swipe turns the page: sideways when the slide fits the window, and any flick during the slide show. One gesture turns one page. Pinch-zoom is unchanged |
 | 2026-10-14 | Format Shape: the Fill transparency slider shows the selected solid fill, and leaving it no longer clears that transparency |
 | 2026-10-13 | Web file picker: a picture, sound, video or outline finishes on the document and slide that asked for it, and is dropped if that presentation was closed or the picker dismissed (#414) |
-| 2026-10-14 | Paragraph dialog (Home › Paragraph launcher): alignment, first-line and hanging indents, spacing before and after, line spacing, and a Tabs dialog, each applied in one undo step. Breadth stays 79% |
-| 2026-10-14 | Font dialog (Home › Font, the shape menu, Cmd+T): family, size, bold, italic, underline, colour, strikethrough, baseline, caps and character spacing, applied in one undo step. Breadth stays 79% |
+| 2026-10-14 | Paragraph dialog (Home › Paragraph launcher): alignment, first-line and hanging indents, spacing before and after, line spacing, and a Tabs dialog, each applied in one undo step |
+| 2026-10-14 | Font dialog (Home › Font, the shape menu, Cmd+T): family, size, bold, italic, underline, colour, strikethrough, baseline, caps and character spacing, applied in one undo step |
 | 2026-10-13 | Grid Options: spacing, snap to grid, snap to other objects, and whether gridlines and guides are drawn; the on-screen grid uses that spacing |
 | 2026-10-13 | WordArt adjust handles: a selected text warp shows one yellow handle per adjust, and dragging it sets that guide value (one undo step) |
 | 2026-10-14 | Draw: pen pressure scales ink width when the pointer reports it (a mouse or a missing reading stays at the pen width; a stroke saved as a flat 0.5 still draws at the pen width). Tilt is not read |
@@ -269,6 +220,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Community PR wave folded: headline breadth 84% over 191 features (P0 92%, P1 82%, P2 55%) and the feature-area breadths from `cargo xtask parity`; one row per area; Upcoming item 2 merged; per-PR count notes dropped from the progress log. Ready stays ~55%, stage alpha |
 | 2026-10-13 | trivial | Progress log: Eyedropper in the colour menus, slide.colorAt (#367) |
 | 2026-10-13 | trivial | Progress log: video seek frame-loss race and regression coverage |
 | 2026-10-14 | minor | Presenter keyboard navigation and end-screen controls |
diff --git a/docs/animation-parity.md b/docs/animation-parity.md
index c8adf49b..7cd99abf 100644
--- a/docs/animation-parity.md
+++ b/docs/animation-parity.md
@@ -1,8 +1,6 @@
 # Transitions and animations: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (interactive-deck clicks in the slide show; previous: major (transitions measured frame by frame against PowerPoint for Windows' video export and retuned; previous: created)) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (animation bounce end and repeat round-trip; rewind still #77) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Animations ▸ Preview plays the current slide on the editor canvas; previous: major, transitions measured frame by frame) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (community PR wave 2026-10-14: interactive-deck triggers, canvas preview, the Animation Pane timeline, repeat and bounce end round-trip; duplicated rows and headers folded; previous: major, transitions measured frame by frame against PowerPoint for Windows' video export) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Transitions and animations are what make a deck a presentation, and the part of PowerPoint people
 notice first when it's missing. Scores roll up into [target-app-parity.md](target-app-parity.md)
@@ -74,8 +72,6 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 | Animation Painter | yes | yes (#54) |
 | Animation Pane: list, reorder, remove | yes | yes |
 | Animation Pane: advanced timeline (bars you drag) | yes | yes: bars from the show schedule, drag the body for delay, the right edge for duration, seconds ruler (`animpane_tests`) |
-| Preview in the editor (current effect, from selected) | yes | partly |
-| Animation Pane: advanced timeline (bars you drag) | yes | **no** |
 | Preview on the editor canvas (the current slide) | yes | yes |
 | Preview from the selected effect | yes | no |
 | Motion path editing (edit points, reverse, lock) | yes | partly (no edit points) |
@@ -87,20 +83,18 @@ In, Wipe, Zoom, Float In, Grow/Shrink, Pulse, Spin, motion lines): weighted, ~85
 | Work | Hours |
 |---|---|
 | Preview from selected, effect dialog depth | 4–6 |
-| Animation Pane timeline, preview from the selected effect, effect dialog depth | 4–7 |
 | The remaining ~126 effects (most are parameter variations of existing ones) | 3–6 |
 | Rewind and other effect options on round trip (#77) | 1–2 |
 | Transition sounds: the rest of PowerPoint's built-in list (Applause, Arrow, Bomb…) | 1 |
-| Rewind on round trip (#77) | 1–2 |
-| Transition sounds | 1–2 |
 | Morph across pictures, `!!` names, align once per transition (#67) | 2–4 |
 | Cloth, paper and particle transitions as real meshes (Curtains, Peel Off, Page Curl, Airplane, Origami, Vortex, Shred, Honeycomb) | 4–8 |
-| **Total** | **~16–30** (the Transitions and Animations rows of the feature table; part of the Features dimension's 140–240 h) |
+| **Total** | **~15–27** (the Transitions and Animations rows of the feature table; part of the Features dimension's 140–240 h) |
 
 ## Revision history
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Community PR wave folded: the Animation Pane timeline row says yes (it landed), preview split into canvas (yes) and from the selected effect (no); estimates drop the timeline and transition sounds (~15–27 h) |
 | 2026-10-14 | trivial | Repeat and bounce end round-trip through PPTX; rewind is still lost (#77) |
 | 2026-10-13 | minor | Animations ▸ Preview and Animation Pane ▸ Play All play the current slide's animations on the editor canvas; preview from the selected effect is still open |
 | 2026-10-13 | major | Transitions measured frame by frame against PowerPoint's video export and retuned (mean diff 35.7 → 15.0); PowerPoint's XML defaults and option meanings; new options |
diff --git a/docs/architecture.md b/docs/architecture.md
index cbe0835e..6766dca6 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -1,20 +1,10 @@
 # DeckCraft architecture
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Size and Position dialog, 227 commands, 28 dialogs; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (228 commands; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog, `insert.photoAlbum`; 227 commands, 28 dialogs; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Edit Photo Album, `insert.photoAlbumEdit`; 228 commands, 28 dialogs; previous: trivial, Photo Album dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors dialog; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts dialog; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Date and Time dialog; 28 dialogs, 226 commands; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (command registry 227; dialogs stay 27; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (command registry counted at 236; dialogs stay 27; the test-count line stays 504; previous: transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog, 227 commands, 28 dialogs; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Paragraph and Tabs dialogs, 229 commands, 29 dialogs; previous: minor, Font dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (community PR wave 2026-10-14: 320 engine commands, 41 dialogs, the `metafile` crate, 1,641 tests; duplicated L2/L5/L6 rows and headers folded; previous: minor, transition frames) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft is built today. The binding rules (layering, everything is a command, thin UI, never
 break wasm, never crash) are in [AGENTS.md](../AGENTS.md) §3–§5; this document describes what
-exists. 117k lines of Rust in 23 crates, 3 apps and `xtask`; 504 `#[test]` functions
+exists. 202k lines of Rust in 24 crates, 3 apps and `xtask`; 1,641 `#[test]` functions
 (`cargo xtask stats` counts them per crate).
 
 ## Layers
@@ -25,27 +15,13 @@ nothing below L6 uses egui, eframe, winit or rfd.
 
 | Layer | Crates | What they do |
 |---|---|---|
-| L0 | `geom`, `color`; standalone `bitstream`, `matroska`, `ogg`, `opus` | EMU/pt units, transforms, ~180 preset shape generators re-derived from ECMA-376, adjust handles, hit testing; RGB/HSL and DrawingML colour transforms; MKV/WebM and Ogg demuxers, the Opus decoder |
+| L0 | `geom`, `color`, `metafile`; standalone `bitstream`, `matroska`, `ogg`, `opus` | EMU/pt units, transforms, ~180 preset shape generators re-derived from ECMA-376, adjust handles, hit testing; RGB/HSL and DrawingML colour transforms; MKV/WebM and Ogg demuxers, the Opus decoder; EMF/WMF read into a neutral vector model (`metafile`) |
 | L1 | `model`, `fonts`; `h264`, `hevc`, `vp9`, `av1`, `isobmff` | Presentation, masters, layouts, slides, shapes, text, themes, tables, charts, transitions, animations, placeholder inheritance (`resolve`); font database (craft-fonts + system) with metric-compatible substitutes for Office fonts (Carlito for Calibri, Caladea for Cambria, Liberation for Arial/Times); video decoders and the MP4/MOV demuxer |
 | L2 | `text`, `anim`, `format`, `media` | Shaping (HarfRust), UAX #9 bidi, UAX #14 line breaking, autofit, caret hit testing; per-shape animation state over time, the show state machine, transition frame layouts, Morph matching; `.deckcraft` (zip + JSON + media) and outline text; media probing, decoding, mixer and clock |
 | L3 | `render`, `pptx` | `vello_cpu` raster of slides, masters and layouts (fills, outlines, effects, pictures, tables, charts, Morph frames); PPTX import/export from ECMA-376 |
 | L4 | `pdf` | PDF export through krilla |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (228 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (228 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (236 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 27 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (226 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (227 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 28 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
-| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (229 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
-| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 29 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
+| L5 | `engine` | Sessions, documents, selection, undo history on shared slide snapshots, the command registry (320 commands in `cmd/*`), pointer tools, keys, AutoRecover, the panic guard (`guard.rs`) |
+| L6 | `ui-egui`, `mcp` | The PowerPoint-style interface (ribbon with 10 tabs + contextual tabs, canvas, thumbnails, panes, 41 dialogs, show and presenter windows, the JSON control channel); the MCP server (JSON-RPC 2.0 over stdio), headless or connected to a running app |
 | apps | `deckcraft` (desktop: eframe/wgpu, cpal audio, logging), `deckcraft-cli` (run, render, convert, mcp, app), `deckcraft-web` (trunk; WebGPU with WebGL2 fallback), `xtask` | Exempt from layering |
 
 The media codecs and containers are clean-room pure Rust, 59k lines, shared in spirit with
@@ -103,6 +79,7 @@ macOS, Windows, Linux, FreeBSD and web artifacts.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Community PR wave folded: one L2/L5/L6 row each; command registry 320 (`cmd!` registrations in `cmd/*`), 41 dialogs (titled in `dialogs.rs`), 202k lines, 24 crates (`metafile` added at L0), 1,641 tests. The per-PR rows below give the counts each PR saw on its own branch |
 | 2026-10-14 | minor | Size and Position dialog (`shape.sizePosition`): position, size, rotation, scale and lock aspect in one undo step. 227 commands, 28 dialogs |
 | 2026-10-14 | trivial | Command registry: 228 (`comment.next`, `comment.prev`) |
 | 2026-10-14 | trivial | Photo Album dialog and `insert.photoAlbum` (227 commands, 28 dialogs) |
diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md
index 1b926ce3..a5f72fe7 100644
--- a/docs/file-format-parity.md
+++ b/docs/file-format-parity.md
@@ -1,18 +1,6 @@
 # File-format parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (SmartArt text follows `dsp:txXfrm`; previous: trivial, Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233)) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width comments: modern threaded parts written, #70; groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously major: created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (EMF/WMF rectangle clip regions; previous: trivial, groups with a small legacy child space, #233) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (embedded fonts read, written and drawn; MicroType Express subsets kept but not drawn; previously trivial: groups with a small legacy child coordinate space, #233) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus round-trip; notes-master header and footer text kept; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus for comments, links and actions, custom shows, rotated groups and inherited placeholders; paragraph `defRPr` and action sounds kept; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus for text effects, body layout, theme effects, fills, bevels and connectors; a run's inner shadow, reflection and soft edge, and a bevel preset with no kept 3-D XML, survive a save; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (3-D model parts and animation bounce end round-trip; `corpus_media.rs` covers SmartArt and OLE XML, media bookmarks and trims, sections, fields, ink and timing) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines round-trip; previously trivial: groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned corpus for tables, charts, animations, media, sections and masters; handout-master text kept; previous: trivial, groups with a small legacy child coordinate space) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a PNG or JPEG slide export records its resolution, so the default 2× picture is 144 dpi; previous: groups with a small legacy child coordinate space draw outlines at their own width, #233) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines are drawn; previously minor: chart trendlines round-trip; groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from `crates/pptx`) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (an unchanged chart keeps its embedded workbook on save, #335) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** major (community PR wave 2026-10-14: seven owned PPTX corpus files, embedded fonts, EMF/WMF clip regions, threaded comments (#70), chart trendlines and workbooks (#335), SmartArt written as a diagram, tags and custom XML kept, picture export DPI; duplicated rows and headers folded; previous: trivial, lines in scaled groups, #233) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested.
 Gaps are itemized in [gaps.md](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -28,11 +16,7 @@ PowerPoint opens and saves; Viewer = opens only).
 
 | Format | PowerPoint | DeckCraft read | DeckCraft write | Fidelity / notes | Tested by |
 |---|---|---|---|---|---|
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); corpus is decks we author, not measured against PowerPoint renders | `crates/pptx/tests/corpus.rs`, `roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); an owned corpus covers comments, links and actions, custom shows, rotated groups and placeholders that inherit from the layout. Embedded fonts and a corpus of decks from outside this repo are still open | `crates/pptx/tests/roundtrip.rs`, `corpus_elements.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); an owned corpus covers text effects, autofit, columns, vertical and RTL text, tabs, line spacing, theme effects, gradient and pattern fills, bevels and connectors. A corpus of decks from outside this repo is still open | `crates/pptx/tests/roundtrip.rs`, `corpus_style.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); never measured on real decks | `crates/pptx/tests/roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs` (30 tests), `corpus_media.rs`; opened in PowerPoint by hand 2026-10-06 |
-| `.pptx` presentation | Editor | yes | yes | Broad (see below); corpus is decks we author, not measured against PowerPoint renders | `crates/pptx/tests/corpus_kinds.rs`, `roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
+| `.pptx` presentation | Editor | yes | yes | Broad (see below); an owned corpus of decks we author round-trips tables, charts, animations, media, sections, masters and layouts, comments, links and actions, custom shows, rotated groups, inherited placeholders, text effects and body layout, theme effects, fills, bevels, connectors, 3-D models and animation bounce end. Not measured against PowerPoint renders or decks from outside this repo | `crates/pptx/tests/corpus.rs`, `corpus_kinds.rs`, `corpus_elements.rs`, `corpus_style.rs`, `corpus_themes.rs`, `corpus_charts.rs`, `corpus_media.rs`, `roundtrip.rs`, `sample.rs`, `malformed.rs`, `sniff.rs`; opened in PowerPoint by hand 2026-10-06 |
 | `.potx` template | Editor | yes (as a presentation) | no: written with the `.pptx` content type | `file.saveTemplate` is Save As under another name | none |
 | `.ppsx` slide show | Editor | yes (as a presentation) | no: written as `.pptx` content | Doesn't start in show mode | none |
 | `.pptm` / `.potm` / `.ppsm` macro-enabled | Editor | no | no | Should open and keep `vbaProject.bin` without running it | none |
@@ -42,8 +26,6 @@ PowerPoint opens and saves; Viewer = opens only).
 | `.deckcraft` native (zip + JSON) | n/a | yes (also `.slidecraft`) | yes | Lossless for the DeckCraft model, forward compatible | `crates/format` tests |
 | PDF | export | no | yes | Slides, notes pages, handouts (1–9); real-text layer with embedded subsets, links, bookmarks. Slide artwork is a raster image at print resolution, not vector | `crates/pdf` tests |
 | Outline `.rtf` / `.txt` | export (RTF), import (outline) | `.txt` outline; `.md` as Markdown (headings are slides, list items bullets) (`slide.fromOutline`) | `.txt` outline | No RTF | engine tests |
-| PNG / JPEG slide images | export | n/a | yes (`file.export`, `deckcraft-cli render`) | Matches the editor's renderer | render tests |
-| Outline `.rtf` / `.txt` | export (RTF), import (outline) | `.txt`/`.md` outline (`slide.fromOutline`) | `.txt` outline | No RTF | engine tests |
 | PNG / JPEG slide images | export | n/a | yes (`file.export`, `deckcraft-cli render`) | Matches the editor's renderer. PNG `pHYs` and JPEG JFIF density are `scale` × 72 dpi (default scale 2 is 144 dpi), so Preview shows the slide's real size | render and engine tests |
 | TIFF / BMP / GIF slide images | export | n/a | no | Easy (the `image` crate writes them) | none |
 | Animated GIF of the deck | export | n/a | yes (`file.export` format `gif`, Export…, `deckcraft-cli`, MCP `export`) | One frame per slide from the slide renderer; size small/medium/large/extra large or 16–3840 px wide, 0.1–600 s per slide, loop forever or play once, slide range, hidden slides skipped; a 256-colour palette per frame (exact, or NeuQuant above 256 colours). Transitions and build animations are not animated | `crates/engine/src/gif_export.rs` tests (decoded frames, size, delay, loop, hidden slides, hostile params), MCP, CLI and export dialog tests |
@@ -65,10 +47,8 @@ PowerPoint opens and saves; Viewer = opens only).
 | WMV | yes (Windows) | embedded, not playable | |
 | Online video (YouTube embeds) | yes | no | Cloud feature |
 | Embedded OLE objects | yes | kept on round trip (opaque), not insertable or editable | `ShapeKind::Opaque` |
-| 3-D models (`.glb`) | yes | no | |
 | Embedded fonts | yes | yes | `p:embeddedFontLst` read and written. TrueType, OpenType and Embedded OpenType faces are used to draw; MicroType Express subsets are kept and written back, not drawn |
 | 3-D models (`.glb`) | yes | kept | The model part round-trips (`p:contentPart`, including an `mc:AlternateContent` choice and its fallback picture). Not drawn as a mesh and not inserted from the ribbon |
-| Embedded fonts | yes | no | `p:embeddedFontLst` ignored |
 
 ## PPTX coverage (PresentationML / DrawingML)
 
@@ -86,21 +66,15 @@ the round trip even though DeckCraft doesn't model it.
 | Shapes: preset geometry (~180 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in `crates/geom/src/preset.rs` (and `preset/extra.rs`). Outlines, dashes, arrowheads and ink inside a group, and text, keep their size in points whatever the group's child-coordinate scale (#233). |
 | Fills: solid, gradient, picture (stretch/tile/crop), pattern, group | yes | yes | |
 | Lines: dash, compound, caps, joins, arrowheads | yes | yes | |
-| Effects: shadow, glow, soft edges, reflection | yes | yes | |
-| 3-D: `scene3d`, `sp3d` | kept | kept | Not rendered |
-| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow`, date fields and paragraph `defRPr` (the defaults a placeholder's runs inherit, including a link). A click or hover action keeps its sound, `endSnd`, and a custom show's "Show and return" |
+| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow`, date fields and paragraph `defRPr` (the defaults a placeholder's runs inherit, including a link). A click or hover action keeps its sound, `endSnd`, and a custom show's "Show and return". Gradient and outline on a run, autofit, columns, vertical and RTL text, tab stops and line spacing round-trip (`corpus_style.rs`) |
 | Effects: shadow, glow, soft edges, reflection | yes | yes | On a run, inner shadow, reflection and soft edges are kept along with the outer shadow and glow |
-| 3-D: `scene3d`, `sp3d` | kept | kept | A bevel preset with no `sp3d` of its own is written back on shapes and theme effect styles. Bevels, cameras and face lighting draw approximately; extrusion does not |
-| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. `justLow`, date fields, gradient and outline on a run, autofit, columns, vertical and RTL text, tab stops and line spacing (`corpus_style.rs`) |
+| 3-D: `scene3d`, `sp3d` | kept | kept | A bevel preset with no `sp3d` of its own is written back on shapes and theme effect styles. Bevels, cameras, face lighting and extrusion sides draw approximately |
 | Text warp (`prstTxWarp`) | yes | yes | All 40 presets rendered (`crates/geom/src/warp.rs`); adjust values (`avLst`) round-trip |
 | Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
 | Tables with styles | yes | yes | Merges and both diagonal borders round-trip |
 | Charts (`c:chartSpace`) | yes | yes | Original XML kept in `Chart.raw`. Trendlines (type, order or period, forecast, intercept, equation and R²) are read, written and drawn. A combo chart's secondary value axis is read and is not written back when the chart is rebuilt. An unchanged chart also keeps its embedded workbook and the other parts its relationships point at, under fresh `keptN` names so they never replace a part DeckCraft writes (#335); editing the chart drops that workbook instead of writing a stale one |
 | Charts (`cx:` chartex: waterfall, funnel, treemap, sunburst, histogram, Pareto, box) | yes | yes | Unchanged parts kept, with their embedded workbook (#335); edited and new ones written from the model with a plain-chart fallback. Treemap and sunburst hierarchy levels kept; region maps kept, drawn as tiles (no map geometry) |
-| SmartArt (`dgm`) | drawing part only, as a group; text laid out on its `dsp:txXfrm` rectangle | as shapes | Diagram data model lost on save |
-| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save. A diagram with no relationship parts keeps its XML; the drawing and data parts are still dropped (#203) |
-| SmartArt (`dgm`) | drawing part only, as a group | as shapes | Diagram data model lost on save (DeckCraft keeps its own outline in `.deckcraft` only) |
-| SmartArt (`dgm`) | the drawing part as a group, and the outline from the data model (Text Pane) | as a diagram: data model from the outline; layout, quick style and colour parts (the file's own kept until the layout is switched); the group as the cached drawing | DeckCraft's layout definitions are simple; a diagram without a cached drawing isn't drawn |
+| SmartArt (`dgm`) | the drawing part as a group (text laid out on its `dsp:txXfrm` rectangle), and the outline from the data model (Text Pane) | as a diagram: data model from the outline; layout, quick style and colour parts (the file's own kept until the layout is switched); the group as the cached drawing | DeckCraft's layout definitions are simple; a diagram without a cached drawing isn't drawn. SmartArt kept only as XML, without its relationship parts, still loses the drawing and data parts (#203) |
 | Equations (OMML, `a14:m`) | no | no | PR #55 open |
 | Audio / video (`p14:media`, trim, fades, bookmarks) | yes | partly | Playback options lost on save (#74) |
 | Ink (`contentPart`) | yes | as a group of freeform lines | PowerPoint sees shapes, not ink |
@@ -109,13 +83,10 @@ the round trip even though DeckCraft doesn't model it.
 | Comments: legacy | yes | yes | |
 | Comments: modern threaded (`p188`) | yes | yes | Written next to the flattened legacy part; replies and resolved state round-trip (`threads_and_resolved_round_trip`) |
 | Unknown slide-level elements (`graphicFrame` OLE, extensions, `mc:AlternateContent`) | kept | kept | Rendered as a labelled placeholder with the preview picture when present |
-| Tags, custom XML, VBA | no / no / no | | |
 | Embedded fonts | yes | yes | MicroType Express subsets kept, not drawn |
 | Tags (`p:custDataLst`) on the presentation, slides and shapes | yes | yes | Add-ins such as think-cell keep their identity; `tags_survive_round_trip` |
-| Custom XML, VBA | no / no | no / no | |
 | Custom XML data, sensitivity label (`docMetadata/LabelInfo.xml`), custom document properties | kept verbatim | yes | SharePoint metadata and the label survive a save; `custom_xml_label_and_custom_properties_survive_save` |
-| Tags, VBA | no / no | | |
-| Embedded fonts | no | no | |
+| VBA | no | no | |
 | Encryption (password to open) | no | no | |
 
 ### What would move the PPTX number
@@ -132,6 +103,7 @@ the round trip even though DeckCraft doesn't model it.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Community PR wave folded: one row each for `.pptx` (seven owned corpus files), outline, 3-D models, embedded fonts, text, effects, 3-D (extrusion sides draw now), SmartArt (written as a diagram) and VBA (tags and custom XML are kept) |
 | 2026-10-12 | minor | SmartArt import lays each shape's text out on its `dsp:txXfrm` text rectangle instead of the shape box |
 | 2026-10-13 | minor | EMF/WMF rectangle clip regions limit later drawing; EMF+ records remain |
 | 2026-10-13 | minor | Embedded fonts read and written; TrueType, OpenType and Embedded OpenType faces drawn |
diff --git a/docs/gaps.md b/docs/gaps.md
index 5f3f8fa7..4adfda40 100644
--- a/docs/gaps.md
+++ b/docs/gaps.md
@@ -1,40 +1,6 @@
 # Where DeckCraft falls short of PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (interactive-deck clicks in the slide show; previous: minor (3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues)) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (gap 3 shrinks to media options and rewind: comment threads round-trip now, #70; 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (EMF/WMF rectangle clip regions; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (embedded fonts are read, written and drawn, except MicroType Express subsets; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt Transform gallery applies a text warp; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned PPTX corpus round-trip; notes-master header and footer kept; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned PPTX corpus for comments, links, custom shows, groups and inherited placeholders; paragraph defaults and action sounds kept; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned PPTX corpus for text effects, body layout, theme effects, fills, bevels and connectors; run effect lists and bevel presets kept; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (owned corpus `corpus_media.rs`: 3-D model parts and animation bounce end round-trip; the real-deck corpus and #70/#74/#77 stay open) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines round-trip; previous: minor, 3-D bevel, camera and face lighting rendered; IME composition and CJK interface text landed, #101; core-workflow alpha gate added; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Icons places a Lucide stroke set; 3-D models and stock content remain; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Size and Position dialog; previous: minor, 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (six original starter decks on File › New; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (IME composition in a table cell is underlined; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album is one of 28 dialogs; Font, Bullets, Find, Replace Fonts, Action Settings, Print and Insert Object remain; previous: minor, 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Edit Photo Album reuses the Photo Album dialog, still 28; Font, Bullets, Find, Replace Fonts, Action Settings, Print and Insert Object remain; previous: trivial, Photo Album counted) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors; dialogs 27 → 28; previous: 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts; dialogs 27 → 28; previous: 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Date and Time dialog; 28 dialogs; previous: 3-D bevel, camera and face lighting) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (owned PPTX corpus for more deck kinds; handout-master text kept; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (laser pointer in the slide show; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (command palette no longer offers Export without a path, #79; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; checklist row stays P so breadth stays 79%; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; checklist letters unchanged, breadth stays 79%, dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (chart trendlines are drawn; previous: minor, chart trendlines round-trip; 3-D bevel, camera and face lighting rendered; IME composition and CJK interface text landed, #101; core-workflow alpha gate added; stage stays alpha; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture options are pane controls, not a new dialog; dialogs stay 27; previous: 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (animation preview plays on the editor canvas; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a two-finger twist rotates the selection; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a trackpad swipe turns the page in the editor and the show; pinch-zoom remains; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Paragraph dialog; previous: minor, Font dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options dialog; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt adjust handles drag; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (pen pressure scales ink width; tilt, pinch and trackpad gestures remain; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (unchanged chart workbooks round-trip, #335; previous: minor, 3-D bevel, camera and face lighting rendered; previous: minor, IME composition and CJK interface text landed, #101; previous: minor, core-workflow alpha gate added; stage stays alpha; before that: major, first itemized gap list; full re-measure against PowerPoint for Mac 16.113.4 and the open GitHub issues) · **Target**:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** major (community PR wave 2026-10-14: soak tests, PPTX corpus, comment threads (#70), embedded fonts, SmartArt Text Pane, Animation Pane timeline, Hunspell spelling, thesaurus, AutoCorrect, 14 new dialogs, pen pressure and trackpad gestures; duplicated entries and headers folded; previous: minor, 3-D bevel, camera and face lighting rendered) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Every known shortfall, one entry each, ranked by how much it stops someone who presents with
 PowerPoint from switching. This is the work list: pick from the top. Numbers are summarized in
@@ -54,16 +20,13 @@ revision history.
 | 1 | PPTX corpus is only decks we author (no PowerPoint reference renders) | File format | B | 20–35 | [file-format-parity.md](file-format-parity.md) |
 | 2 | Data loss and crashes on common paths (#60, #40, #59) | Stability | B | 6–12 | this file |
 | 3 | PPTX round trip drops media options and rewind (#74, #77) | File format | B | 2–4 | [file-format-parity.md](file-format-parity.md) |
-| 4 | SVG pictures don't render (EMF/WMF do) | File format | B | 6–12 | [file-format-parity.md](file-format-parity.md) |
-| 3 | PPTX round trip drops comment threads, media options, rewind (#70, #74, #77) | File format | B | 3–6 | [file-format-parity.md](file-format-parity.md) |
 | 4 | SVG pictures don't render (EMF/WMF do) | File format | B | 4–8 | [file-format-parity.md](file-format-parity.md) |
 | 5 | No localization: English only | Localization | B (infra + 5 languages) | 55–90 | [localization-parity.md](localization-parity.md) |
 | 6 | No printing | Feature | B | 5–8 | [file-format-parity.md](file-format-parity.md) |
 | 7 | Fonts: only Regular, Bold and Italic faces (#69) | Feature | B | 3–5 | [ui-parity.md](ui-parity.md) |
 | 8 | Image paste fails on Windows and Linux (#53) | Feature | B | 2–4 | [ui-parity.md](ui-parity.md) |
 | 9 | Presenter view isn't placed on the second display | Hardware | B | 3–5 | [slideshow-parity.md](slideshow-parity.md) |
-| 10 | Animation Pane: thin preview (timeline done); 64 of ~190 effects | Feature | B (pane) | 8–14 | [animation-parity.md](animation-parity.md) |
-| 10 | Animation Pane: no timeline; preview is the whole slide, not from the selected effect; 64 of ~190 effects | Feature | B (pane) | 10–16 | [animation-parity.md](animation-parity.md) |
+| 10 | Animation Pane: preview plays the whole slide, not from the selected effect (timeline done); 64 of ~190 effects | Feature | B (pane) | 8–14 | [animation-parity.md](animation-parity.md) |
 | 11 | Charts: data grid editing, elements, `chartex` types | Feature | B (data, elements) | 12–20 | [parity-checklist.md](parity-checklist.md) |
 | 12 | Format Shape pane thinner than PowerPoint's | UI/UX | B | 6–10 | [ui-parity.md](ui-parity.md) |
 | 13 | No native macOS menu bar | UI/UX | B | 3–5 | [ui-parity.md](ui-parity.md) |
@@ -85,19 +48,15 @@ revision history.
 - **Estimate:** 4–8 h (backend probing outside the process or a safe-mode fallback, a software
   renderer path). Needs a tester with the hardware. **Beta blocker.**
 
-### Soak testing is engine-only
+### Soak testing has no memory or timing budgets
 - **Evidence:** `crates/engine/src/soak_tests.rs` runs seeded random command sequences over a
   ~100-slide deck (validity, selection, undo/redo exactness, bounded undo, save/reopen in both
   formats every 100 steps); `DECKCRAFT_SOAK_STEPS` runs it long. It found a chart `clamp` panic
-  that blanked whole slides. Still missing: UI-level (kittest) soak, memory and timing budgets.
-- **Impact:** long-session crash rate is now sampled in CI; slowdowns are not measured.
-- **Estimate:** 2–4 h left.
-### Soak testing is new
-- **Evidence:** `crates/ui-egui/src/ui_soak_tests.rs` drives the whole window with seeded random
-  clicks, drags, keys (plain, Ctrl, Shift), typing and scrolling over the sample deck, checking
-  document validity, bounded undo/journal/thumbnail/texture caches, zero caught command and
-  render panics (`Session::panics_caught`, `deckcraft_render::panics_caught`) and a mean frame
-  under 250 ms; 4 × 3000-action runs are clean. Engine-level command soak: PR #502.
+  that blanked whole slides. `crates/ui-egui/src/ui_soak_tests.rs` drives the whole window with
+  seeded random clicks, drags, keys (plain, Ctrl, Shift), typing and scrolling over the sample
+  deck, checking document validity, bounded undo/journal/thumbnail/texture caches, zero caught
+  command and render panics (`Session::panics_caught`, `deckcraft_render::panics_caught`) and a
+  mean frame under 250 ms; 4 × 3000-action runs are clean.
 - **Impact:** long-session crash rate is sampled in CI; RSS is not measured directly.
 - **Estimate:** 1–2 h (RSS sampling per platform).
 
@@ -106,48 +65,26 @@ revision history.
 Detail in [file-format-parity.md](file-format-parity.md).
 
 ### PPTX corpus is only decks we author
-- **Evidence:** `crates/pptx/tests/corpus.rs` builds decks in this repo and checks open → save →
-  reopen (package parts and text): a talk with a table, chart, picture, link and comment, and a
-  notes master with a header and footer. Saving used to replace that notes master with an empty
-  one, so "Acme review" and "Do not circulate" disappeared; they are kept now. There is still no
-  larger corpus and no reference render from PowerPoint.
-### PPTX has never met a corpus of real decks
-- **Evidence:** PPTX tests use decks DeckCraft generates. An owned check
-  (`crates/pptx/tests/corpus_elements.rs`) now opens, saves and reopens comments, hyperlinks and
-  actions, custom shows, grouped rotated objects, and placeholders that inherit position, geometry
-  and text from the layout. That check found paragraph default run properties (`defRPr`, including
-  a link) and action sounds (the sound itself, stop-previous, and a custom show's "Show and
-  return") were dropped on save; they are kept now. Embedded fonts, comment threads (#70), media
-  options (#74) and animation rewind (#77) are still open, and there is no corpus of decks from
-  outside this repo. No reference renders from PowerPoint exist to compare against.
-- **Evidence:** PPTX tests use decks DeckCraft generates. An owned check
-  (`crates/pptx/tests/corpus_style.rs`) now opens, saves and reopens text effects (gradient, outline,
-  shadow, glow, inner shadow, reflection and soft edge), autofit, columns, vertical and RTL text,
-  tab stops, line spacing, theme effects, gradient and pattern fills, 3-D bevels and connectors.
-  That check found a run's inner shadow, reflection and soft edge were dropped, and a bevel preset
-  with no kept `sp3d` was not written back; both are kept now. Comment threads (#70), media options
-  (#74), animation rewind (#77) and embedded fonts are still open, and there is no corpus of decks
-  from outside this repo. No reference renders from PowerPoint exist to compare against.
-- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests, plus `corpus_media.rs`) uses decks
-  DeckCraft generates; the 2026-10-07 alpha checklist already listed this as open. No reference
-  renders from PowerPoint exist to compare against. `corpus_media.rs` opens, saves and reopens
-  SmartArt and OLE kept as XML (no diagram or embedding parts; those stay with #203), audio and
-  video bookmarks and trims, a section holding a hidden slide, slide-number and date fields, ink
-  (saved as freeform lines), `.glb` 3-D models, and animation repeat, bounce end and triggers.
-  Playback options (#74) and rewind (#77) are still lost.
-- **Evidence:** every PPTX test (`crates/pptx/tests`, 30 tests) uses decks DeckCraft generates;
-- **Evidence:** every PPTX test (`crates/pptx/tests`) uses decks DeckCraft generates;
-  the 2026-10-07 alpha checklist already listed this as open. No reference renders from PowerPoint
-  exist to compare against. `crates/pptx/tests/corpus_themes.rs` starts on PowerPoint-shaped XML:
-  themes and two masters with their layouts, shadow/glow/soft-edge/reflection effects, and text
-  and shape hyperlinks and actions (text Mouse Over actions were dropped; now kept).
-  exist to compare against. `corpus_charts.rs` round-trips one owned slice (a combo chart with
-  data labels and trendlines, a merged table with diagonal borders, text columns, autofit,
-  vertical text and a WordArt warp). That is still a generated deck, not a corpus of real ones.
-- **Evidence:** `crates/pptx/tests/corpus_kinds.rs` builds decks in this repo and checks open → save →
-  reopen (package parts and text): tables, charts, animations, media, sections, and several masters
-  and layouts. A handout master with a header, footer, date and slide number used to disappear on
-  save; that text is kept now. There is still no larger corpus and no reference render from PowerPoint.
+- **Evidence:** every PPTX test (`crates/pptx/tests`) uses decks built in this repo; the
+  2026-10-07 alpha checklist already listed this as open, and no reference renders from PowerPoint
+  exist to compare against. The owned corpus checks open → save → reopen (package parts and text):
+  `corpus.rs` (a talk with a table, chart, picture, link and comment; a notes master's header and
+  footer), `corpus_kinds.rs` (tables, charts, animations, media, sections, several masters and
+  layouts; a handout master's header, footer, date and slide number), `corpus_elements.rs`
+  (comments, hyperlinks and actions, custom shows, grouped rotated objects, placeholders that
+  inherit from the layout), `corpus_style.rs` (text effects, autofit, columns, vertical and RTL
+  text, tab stops, line spacing, theme effects, gradient and pattern fills, 3-D bevels,
+  connectors), `corpus_themes.rs` (PowerPoint-shaped themes and two masters with their layouts,
+  effects, text and shape hyperlinks and actions), `corpus_charts.rs` (a combo chart with data
+  labels and trendlines, a merged table with diagonal borders, text columns, autofit, vertical
+  text, a WordArt warp) and `corpus_media.rs` (SmartArt and OLE kept as XML, with no diagram or
+  embedding parts, which stay with #203; audio and video bookmarks and trims; a section holding a
+  hidden slide; slide-number and date fields; ink as freeform lines; `.glb` 3-D models; animation
+  repeat, bounce end and triggers). Losses these checks found are fixed: notes- and handout-master
+  text, paragraph default run properties (`defRPr`, including a link), action sounds, a run's
+  inner shadow, reflection and soft edge, a bevel preset with no kept `sp3d`, and text Mouse Over
+  actions. Still open: media options (#74), animation rewind (#77) and a corpus of decks from
+  outside this repo.
 - **Impact:** the main reason to switch is "open my PowerPoint decks". Fidelity on real decks
   (corporate templates, SmartArt, `chartex` charts, embedded fonts, EMF) is still mostly unknown.
 - **Estimate:** 20–35 h: grow the owned corpus in `storytold/photocraft-corpus` style (craftrules
@@ -263,9 +200,10 @@ Detail in [file-format-parity.md](file-format-parity.md).
 
 ### Animation Pane, effect count and preview
 Animations ▸ Preview and the pane's Play All play the current slide's animations on the editor
-canvas (Escape or a click stops them). Still open: the advanced timeline, starting from the
-selected effect, and most of the effect gallery. Detail in
-[animation-parity.md](animation-parity.md). 10–16 h; the pane's timeline is a **beta blocker**.
+canvas (Escape or a click stops them), and the pane has an advanced timeline with draggable bars
+(`crates/ui-egui/src/animtimeline.rs`). Still open: previewing from the selected effect, and most
+of the effect gallery. Detail in [animation-parity.md](animation-parity.md). 8–14 h; the pane is a
+**beta blocker**.
 
 ### Interactive decks: media-action links, audio-triggered effects and click boxes
 - **Evidence:** the slide show plays click-triggered animations, keeps each slide's state across
@@ -292,43 +230,22 @@ selected effect, and most of the effect gallery. Detail in
 - **Estimate:** done for beta.
 
 ### Edit points, text warp, 3-D
-- **Evidence:** checklist rows "Edit points" (P1 missing), "Text warp transforms" (partial: all 40
-  `prstTxWarp` presets render, their adjusts round-trip, and Shape Format ▸ Text Effects ▸
-  Transform applies one with `format.textWarp`; still open are adjust handles, and arc/circle
-  placement can differ from PowerPoint by 1–3 % of the path length), "Bevel and 3-D rotation"
-  (partial: bevels, camera presets and rotations and face lighting render as approximations and
-  `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces, only the three-point rig, and
-  no command or pane to apply 3-D).
-- **Estimate:** 4–6 h (edit points), 1–2 h (warp adjust handles), 6–10 h (3-D extrusion,
-- **Evidence:** checklist rows "Edit points" (P1 partial: Edit Points converts a shape to a freeform, vertices drag, Ctrl/Cmd-click adds or deletes; no point types or Bézier control handles), "Text warp transforms" (partial: all 40
-- **Evidence:** checklist rows "Edit points" (P1 partial: Edit Points converts a shape to a freeform, vertices drag, Ctrl/Cmd-click adds or deletes, smooth/straight/corner points and Bézier handles; no Straight/Curved Segment or Open/Close Path), "Text warp transforms" (partial: all 40
-  `prstTxWarp` presets render and their adjusts round-trip, but there is no Transform gallery or
-  command to apply one, no adjust handles, and arc/circle placement can differ from PowerPoint by
-  1–3 % of the path length), "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting
-  render as approximations and `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces,
-  only the three-point rig, and no command or pane to apply 3-D).
-- **Estimate:** 1 h (edit points: segment types, open/close path), 2–4 h (warp gallery, command and handles), 6–10 h (3-D extrusion,
-  render as approximations and `scene3d`/`sp3d` round-trip as raw XML; extrusions draw their
-  sides under turned cameras, each lit for its own normal; the preset light rigs, rig directions and
-  materials shade bevels and sides approximately (fitted to PowerPoint for three-point/matte only); contours draw as a
-  band round the face outline (not round the extruded silhouette); no command or pane to apply 3-D).
-- **Estimate:** 4–6 h (edit points), 2–4 h (warp gallery, command and handles), 1–2 h (fitting the other rigs and materials
-  to PowerPoint renders), plus the Format Shape page.
-  `prstTxWarp` presets render, their adjusts round-trip, and a selected warp shows a yellow handle
-  per adjust that dragging sets; still no Transform gallery or command to apply one, and arc/circle
-  placement can differ from PowerPoint by 1–3 % of the path length), "Bevel and 3-D rotation"
-  (partial: bevels, camera presets and rotations and face lighting render as approximations and
-  `scene3d`/`sp3d` round-trip as raw XML; no extrusion or side faces, only the three-point rig, and
-  no command or pane to apply 3-D).
-- **Estimate:** 4–6 h (edit points), 1–2 h (Transform gallery and command), 6–10 h (3-D extrusion,
-  rigs and materials, Format Shape page).
+- **Evidence:** checklist rows "Edit points" (P1 partial: Edit Points converts a shape to a
+  freeform, vertices drag, Ctrl/Cmd-click adds or deletes, smooth/straight/corner points and Bézier
+  handles; no Straight/Curved Segment or Open/Close Path), "Text warp transforms" (partial: all 40
+  `prstTxWarp` presets render, their adjusts round-trip, Shape Format ▸ Text Effects ▸ Transform
+  applies one with `format.textWarp`, and a selected warp shows a yellow handle per adjust that
+  dragging sets; arc/circle placement can differ from PowerPoint by 1–3 % of the path length),
+  "Bevel and 3-D rotation" (partial: bevels, camera presets and rotations and face lighting render
+  as approximations and `scene3d`/`sp3d` round-trip as raw XML; extrusions draw their sides under
+  turned cameras, each lit for its own normal; the preset light rigs, rig directions and materials
+  shade bevels and sides approximately (fitted to PowerPoint for three-point/matte only); contours
+  draw as a band round the face outline (not round the extruded silhouette); Format Shape ▸
+  Effects has 3-D Format and 3-D Rotation).
+- **Estimate:** 1 h (edit points: segment types, open/close path), 1–2 h (fitting the other rigs
+  and materials to PowerPoint renders).
 
 ### Proofing: spelling, thesaurus, AutoCorrect
-- **Evidence:** `review.spelling` checks a small built-in list of frequent misspellings
-  (`crates/engine/src/cmd/review.rs`); no dictionaries, no thesaurus. AutoCorrect has PowerPoint's options (two initial capitals,
-  sentence and day capitals, caps lock, fractions, an editable replace list); no AutoFormat of
-  ordinals or automatic bulleted lists, no undo of a single correction.
-- **Estimate:** 8–14 h (Hunspell-format dictionaries under an open licence per language).
 - **Evidence:** `review.spelling` checks with Hunspell-format dictionaries the system already has
   (`crates/engine/src/spell.rs`: affixes, cross products, one level of continuation, compounds,
   case rules, suggestions), each run in its own language (`lang` from PPTX), with a user dictionary
@@ -336,36 +253,29 @@ selected effect, and most of the effect gallery. Detail in
   context menu to correct, ignore or add; table cells and speaker notes are squiggled too, each
   with a right-click menu; repeated words (`the the`) are flagged with Delete Repeated Word;
   Review › Language marks the selection's proofing language or Do Not Check Spelling
-  (`lang`/`noProof` round-trip in PPTX). No grammar checking. The web build checks on the UI thread a few milliseconds per
-  frame. None ship with DeckCraft, so without one installed (always on Windows and the web) only a
-  short list of common misspellings is found.
-  Thesaurus (#549) and AutoCorrect (#521) have open PRs.
-- **Estimate:** 1–2 h (bundle openly licensed dictionaries).
+  (`lang`/`noProof` round-trip in PPTX). No grammar checking. The web build checks on the UI
+  thread a few milliseconds per frame. No dictionaries ship with DeckCraft, so without one
+  installed (always on Windows and the web) only a short list of common misspellings is found.
+  `review.thesaurus` looks up the selected word (checklist row partial). AutoCorrect has
+  PowerPoint's options (two initial capitals, sentence and day capitals, caps lock, fractions, an
+  editable replace list); no AutoFormat of ordinals or automatic bulleted lists, no undo of a
+  single correction.
+- **Estimate:** 1–2 h (bundle openly licensed dictionaries); 2–4 h (AutoFormat as you type).
 
 ### Equations
 - **Evidence:** checklist row missing; PR #55 (OMML editor, +10.5k lines) is open.
 - **Estimate:** 3–6 h to review, land and round-trip.
 
 ### Smaller missing rows
-Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), laser pointer (1–2 h), transition
-sounds (1–2 h), artistic effects (6–10 h), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
-sounds (1–2 h), artistic effects (3–6 h for the other 15 of 22; 7 approximated and round-tripped), remove background (6–10 h; needs a model or a classical
-Zoom (summary/section/slide, 6–10 h), reuse slides (2–4 h), transition
-Zoom: live thumbnails, the zoom-in animation and the native `p166:sldZm` element (3–5 h; `insert.zoom` makes linked pictures with Return to Zoom), reuse slides (2–4 h), laser pointer (1–2 h), transition
-sounds (1–2 h), artistic effects (6–10 h), remove background (6–10 h; needs a model or a classical
-matte), compress pictures (2–3 h), insert screenshot (2–3 h), record audio/screen and record slide
-show (8–12 h), compare presentations (6–10 h), password protection (4–6 h, ECMA-376 agile
-encryption), ink to shape/text (6–10 h), 3-D models and stock content (6–10 h; Insert › Icons places a Lucide stroke set).
-show (8–12 h), compare presentations beyond slide-level accept (reject, per-object accept,
-markers on the slide: 3–5 h), password protection (4–6 h, ECMA-376 agile
-encryption), ink to shape/text (6–10 h), icons and 3-D models (8–14 h, needs an open icon set).
-Zoom (summary/section/slide, 6–10 h), reuse slides pane with thumbnails (1–2 h; `slide.reuse`
-inserts from a file), laser pointer (1–2 h), transition sounds (1–2 h), artistic effects (3–6 h
-for the other 15 of 22; 7 approximated and round-tripped), remove background (6–10 h; needs a
-model or a classical matte), insert screenshot (2–3 h), record audio/screen and record slide show
-(8–12 h), compare presentations beyond slide-level accept (reject, per-object accept, markers on
-the slide: 3–5 h), password protection (4–6 h, ECMA-376 agile encryption), ink to shape/text
-(6–10 h), 3-D models and stock content (6–10 h; Insert › Icons places a Lucide stroke set).
+Zoom: live thumbnails, the zoom-in animation and the native `p166:sldZm` element (3–5 h;
+`insert.zoom` makes linked pictures with Return to Zoom), reuse slides pane with thumbnails
+(1–2 h; `slide.reuse` inserts from a file), laser pointer from the presenter window (1–2 h),
+artistic effects (3–6 h for the other 15 of 22; 7 approximated and round-tripped), remove
+background (6–10 h; needs a model or a classical matte), insert screenshot (2–3 h), record
+audio/screen and record slide show (8–12 h), compare presentations beyond slide-level accept
+(reject, per-object accept, markers on the slide: 3–5 h), password protection (4–6 h, ECMA-376
+agile encryption), ink to text and math beyond Ink to Shape (6–10 h), 3-D models and stock content
+(6–10 h; Insert › Icons places a Lucide stroke set).
 
 ## UI/UX
 
@@ -380,37 +290,13 @@ Detail in [ui-parity.md](ui-parity.md).
 - **Window chrome** (#71 macOS controls misaligned, #26 GNOME title bar, #41 system light/dark).
   2–4 h.
 - **Icon consistency across Craft apps** (#73, #56). 2–4 h; coordinate in craftrules.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Find/Replace dialog,
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). 8–14 h.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Replace Fonts, Action Settings, Print, Insert Object…). Size and Position is one of the 28. 8–14 h.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Photo Album is one of them). Still missing Font,
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Photo Album is one of them; Edit Photo Album reopens it). Still missing Font,
-  Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object…. 8–14 h.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60. Create New Theme Colors (Design › Colors ›
-  Customize Colors…) edits the open master's twelve theme colours, not a saved library of named
-  schemes. Still missing: Font, Bullets and Numbering, Find/Replace dialog, Replace Fonts, Action
-  Settings, Print, Insert Object. 8–14 h.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60. Create New Theme Fonts (Design › Fonts ›
-  Customize Fonts…) edits the open master's heading and body latin faces and the scheme name.
-  It is not a saved library of theme fonts, and it does not pick East Asian or complex-script
-  faces. Still missing: Font, Bullets and Numbering, Find/Replace dialog, Replace Fonts, Action
-  Settings, Print, Insert Object. 8–14 h.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60 (Font, Bullets and Numbering, Find/Replace dialog,
-  Action Settings, Print, Insert Object…). 8–14 h.
-- **Dialogs**: 30 dialogs vs PowerPoint's ~60 (Font, Find/Replace dialog, Replace Fonts, Print,
-  Insert Object…). Size and Position, Bullets and Numbering, Action Settings and Date and Time are in.
-  Format Background picture options (transparency, tile, offset, scale, alignment, mirror, and Apply
-  to All copying a picture) are pane controls on `design.background`, not another dialog. 8–14 h.
-- **Dialogs**: 28 dialogs vs PowerPoint's ~60. The Font dialog is in (family, size, style, underline,
-  colour, strikethrough, baseline, caps, character spacing, one undo step). Still missing: Bullets
-  and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object…. 6–12 h.
-- **Dialogs**: 29 dialogs vs PowerPoint's ~60. The Font dialog and the Paragraph dialog are in
-  (Paragraph: alignment, first-line and hanging indents, spacing before/after, line spacing, and a
-  Tabs dialog, each OK one undo step). Still missing: Bullets and Numbering, Find/Replace, Replace
-  Fonts, Action Settings, Print, Insert Object…. 4–8 h.
-- **Command palette defaults to an Export entry that fails** (#79). 0.5 h.
+- **Dialogs**: 41 dialogs vs PowerPoint's ~60. In since the d556ff9 count of 27: Font, Paragraph
+  and Tabs, Bullets and Numbering, Find and Replace, Replace Fonts, Action Settings, Size and
+  Position, Date and Time, Photo Album (Edit Photo Album reopens it), Create New Theme Colors and
+  Create New Theme Fonts (each edits the open master's scheme, not a saved library; theme fonts
+  are latin only), Grid Options, AutoCorrect and Paste Special. Format Background picture options
+  are pane controls on `design.background`, not another dialog. Still missing: Print, Insert
+  Object…. 4–8 h.
 
 ## Hardware
 
@@ -422,10 +308,11 @@ Detail in [hardware-parity.md](hardware-parity.md).
   or wgpu path).
 - **Software-only video decode**; PowerPoint uses VideoToolbox/Media Foundation. 8–14 h (copy
   FilmCraft's hardware decode).
-- **No pen pressure or tilt for ink**; no pinch-zoom (it does not keep the point under the pointer). A two-finger twist does rotate the selected shapes. 3–6 h.
-- **No pen pressure or tilt for ink**; no pinch-zoom. A trackpad swipe turns the page when the
-  slide fits the window, and during the show. 2–4 h for pinch-zoom.
-- **Pen pressure scales ink width** when the pointer reports it (a mouse or a missing reading stays at the pen width; a stroke saved as a flat `0.5` still draws at the pen width). Tilt is not read. No pinch-zoom or other trackpad gestures. 2–4 h.
+- **No pen tilt and no pinch-zoom** (it does not keep the point under the pointer). Pen pressure
+  scales ink width when the pointer reports it (a mouse or a missing reading stays at the pen
+  width; a stroke saved as a flat `0.5` still draws at the pen width). A two-finger twist rotates
+  the selected shapes, and a trackpad swipe turns the page when the slide fits the window and
+  during the show. 2–4 h.
 
 ## Localization
 
@@ -468,6 +355,7 @@ Detail in [localization-parity.md](localization-parity.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Community PR wave folded: one entry each for the soak tests (engine and UI), the PPTX corpus (seven owned corpus files), edit points / text warp / 3-D, proofing (Hunspell spelling, thesaurus, AutoCorrect), the smaller missing rows, dialogs (41 vs ~60; Print and Insert Object left) and pen/trackpad input; ranked rows 3, 4 and 10 de-duplicated (comment threads #70 and the pane timeline are done); the fixed command-palette entry (#79) removed |
 | 2026-10-13 | minor | EMF/WMF rectangle clip regions (`INTERSECTCLIPRECT`, `EXCLUDECLIPRECT`, `EXTSELECTCLIPRGN`) limit later drawing. EMF+ records remain |
 | 2026-10-13 | minor | Embedded fonts are read, written and drawn (TrueType, OpenType, Embedded OpenType). The gap is now MicroType Express subsets, which are kept but not drawn |
 | 2026-10-13 | minor | WordArt Transform gallery: Shape Format ▸ Text Effects lists the 40 presets and No Transform; `format.textWarp` applies one (adjust handles still open) |
diff --git a/docs/hardware-parity.md b/docs/hardware-parity.md
index c803da55..3a334d4f 100644
--- a/docs/hardware-parity.md
+++ b/docs/hardware-parity.md
@@ -1,9 +1,6 @@
 # Hardware parity with PowerPoint
 
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (PNG and JPEG slide export record 144 dpi at the default 2 pixels per point; previous: IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a two-finger twist rotates the selection; previous: minor, IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a trackpad swipe turns the page; pinch-zoom remains; previous: minor, IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (pen pressure scales ink width; tilt remains; previous: minor, IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (community PR wave 2026-10-14: picture export DPI, Retina pixel grid (#184), twist to rotate, swipe to turn the page, pen pressure; duplicated rows and headers folded; previous: minor, IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
 
 What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
 ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -47,11 +44,8 @@ because it mostly follows from hardware use.
 |---|---|---|
 | Keyboard and presentation clickers (Page Up/Down, B, Esc) | yes | yes |
 | Mouse and trackpad scroll | yes | yes |
-| Pinch to zoom, two-finger gestures | yes | pinch zoom does not keep the point under the pointer; a two-finger twist rotates the selected shapes |
-| Pinch to zoom | yes | no |
+| Pinch to zoom, two-finger gestures | yes | partial: pinch zoom does not keep the point under the pointer; a two-finger twist rotates the selected shapes |
 | Two-finger swipe between slides | yes | yes: when the slide fits the window, and during the show. A zoomed slide still pans |
-| Pen pressure and tilt for ink (Apple Pencil via Sidecar, Windows Ink) | yes | no: ink strokes have constant width |
-| Pinch to zoom, two-finger gestures | yes | no |
 | Pen pressure and tilt for ink (Apple Pencil via Sidecar, Windows Ink) | yes | pressure scales the stroke when the pointer reports it (a mouse or a missing reading draws at the pen width); tilt is not read |
 | Touch screens (Windows) | yes | basic pointer only |
 | IME input methods for CJK text | yes | yes: composed in place, underlined, candidate window at the caret (#101) |
@@ -81,6 +75,7 @@ outlines every frame (#67, fix open), and the decoders run in software.
 |---|---|---|
 | 2026-10-14 | minor | PNG and JPEG slide export record 144 dpi at the default 2 pixels per point, so a Retina picture opens at the slide's size |
 | 2026-10-13 | trivial | Editor slide rasters sit on the physical pixel grid (#184) |
+| 2026-10-14 | trivial | Community PR wave folded: one row each for pinch/two-finger gestures and pen pressure |
 | 2026-10-14 | minor | A two-finger twist on the trackpad rotates the selected shapes, as one undo step. Pinch-zoom is unchanged |
 | 2026-10-14 | minor | A sideways trackpad swipe turns the page in Normal view (when the slide fits) and in the show. Pinch-zoom is unchanged |
 | 2026-10-14 | minor | Pen pressure scales ink width; tilt, pinch zoom and trackpad gestures remain (estimate 3–6 h → 2–5 h) |
diff --git a/docs/parity-checklist.md b/docs/parity-checklist.md
index 0581dc82..9843d75e 100644
--- a/docs/parity-checklist.md
+++ b/docs/parity-checklist.md
@@ -1,58 +1,38 @@
 # PowerPoint feature checklist
 
-> **Generated:** 2026-10-13 (summary by `cargo xtask parity`; Preview in editor re-scored; earlier rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4; video/animated GIF row re-scored 2026-10-11, #171) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Generated:** 2026-10-14 (summary by `cargo xtask parity`; rows re-scored by the 2026-10-14 community PR wave, duplicate Thesaurus, AutoCorrect, Artistic effects and Corrections rows folded; Preview in editor re-scored 2026-10-13; earlier rows re-scored 2026-10-10 against PowerPoint for Mac 16.113.4; video/animated GIF row re-scored 2026-10-11, #171) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The summary between `<!-- SUMMARY -->
-**Weighted breadth parity: 82%** over 193 features.
+**Weighted breadth parity: 84%** over 191 features.
 
 | Priority | Features | Done | Partial | Missing | Parity |
 |---|---|---|---|---|---|
 | P0 | 72 | 61 | 11 | 0 | 92% |
-| P1 | 65 | 39 | 20 | 6 | 75% |
-| P2 | 54 | 13 | 15 | 26 | 38% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 16 | 25 | 39% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 14 | 15 | 25 | 40% |
-| P1 | 65 | 39 | 21 | 5 | 76% |
-| P2 | 54 | 14 | 17 | 23 | 42% |
-| P1 | 65 | 38 | 21 | 6 | 75% |
-| P2 | 54 | 13 | 16 | 25 | 39% |
-| P1 | 66 | 43 | 18 | 5 | 79% |
-| P2 | 55 | 16 | 20 | 19 | 47% |
+| P1 | 65 | 45 | 16 | 4 | 82% |
+| P2 | 54 | 17 | 25 | 12 | 55% |
 
 | Area | Parity |
 |---|---|
 | Application shell | 81% |
-| Files | 71% |
-| Slides | 90% |
+| Files | 75% |
+| Slides | 92% |
 | Views | 98% |
-| Masters & themes | 88% |
-| Views | 90% |
-| Masters & themes | 88% |
-| Shapes | 88% |
+| Masters & themes | 92% |
 | Shapes | 91% |
 | Format | 83% |
 | Arrange | 100% |
-| Text | 82% |
-| Tables | 95% |
-| Tables | 92% |
+| Text | 83% |
+| Tables | 97% |
 | Charts | 65% |
 | SmartArt | 50% |
-| Pictures | 52% |
+| Pictures | 60% |
 | Media | 67% |
 | Transitions | 100% |
-| Animations | 79% |
-| Slide show | 68% |
-| Transitions | 92% |
 | Animations | 85% |
-| Slide show | 66% |
-| Review | 60% |
+| Slide show | 68% |
 | Review | 70% |
-| Draw | 33% |
-| Undo & clipboard | 100% |
 | Draw | 50% |
-| Undo & clipboard | 88% |
+| Undo & clipboard | 100% |
 | Automation (✱) | 100% |
 | Platforms (✱) | 67% |
 
@@ -175,10 +155,8 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Text | Text direction (rotated, stacked) | P1 | D |
 | Text | Find and replace, replace fonts | P1 | P |
 | Text | Spelling check | P1 | P |
-| Text | Thesaurus | P2 | M |
-| Text | AutoCorrect and smart quotes | P2 | Y |
+| Text | AutoCorrect and smart quotes | P2 | P |
 | Text | Thesaurus | P2 | P |
-| Text | AutoCorrect and smart quotes | P2 | M |
 | Text | Symbols and emoji | P1 | D |
 | Text | Equations | P2 | M |
 | Text | Hyperlinks (URL, slide, email) | P1 | D |
@@ -204,8 +182,6 @@ Open P0 items: Contextual tabs (Shape Format, Picture Format, Table Design/Layou
 | Pictures | SVG pictures | P1 | M |
 | Pictures | Crop (and crop to shape, aspect ratio) | P0 | P |
 | Pictures | Corrections, colour, transparency (recolor and Set Transparent Color done; sharpen/soften and colour temperature pending) | P1 | P |
-| Pictures | Artistic effects | P2 | M |
-| Pictures | Corrections, colour, transparency | P1 | P |
 | Pictures | Artistic effects | P2 | P |
 | Pictures | Remove background | P2 | M |
 | Pictures | Picture styles and borders | P1 | D |
diff --git a/docs/roadmap.md b/docs/roadmap.md
index 7485dd08..8294137d 100644
--- a/docs/roadmap.md
+++ b/docs/roadmap.md
@@ -1,25 +1,6 @@
 # DeckCraft roadmap: milestones and what's next
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (embedded fonts leave the beta list except MicroType Express subsets; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (M9 text warps narrowed to adjust handles; the Transform gallery applies a preset) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus check started; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus covers comments, links, custom shows, groups and inherited placeholders; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus covers text effects, body layout, theme effects, fills, bevels and connectors; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (`corpus_media.rs` keeps 3-D models and animation bounce end; real-deck corpus still open) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (chart trendlines round-trip; the real-deck corpus stays open; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Review previous/next comment; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (six original starter decks; the large template gallery stays after beta; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Zoom dialog; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (owned PPTX corpus covers more deck kinds; handout-master text kept; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (show: See All Slides and zoom; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (presenter timer pause/reset, clock and notes size; previous: trivial, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (custom show playback; previous: trivial, presenter timer) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (go to slide shows the typed number; previous: trivial, custom show playback) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (chart trendlines are drawn; the charts gap stays open for the data grid, chartex and secondary-axis export; previous: trivial, chart trendlines round-trip; the real-deck corpus stays open; core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (canvas animation preview; beta item 9 keeps the timeline; previous: minor, core-workflow alpha gate) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options; previous: core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (M9 text warps: adjust handles drag; gallery and command remain) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (after beta: pen pressure scales ink width, tilt remains; previous: minor, core-workflow alpha gate added; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** major (community PR wave 2026-10-14: PPTX corpus, presenter and show controls, review navigation, starter decks, Grid Options and New Window, WordArt gallery and handles, pen pressure; beta items 9 and 10 narrowed; duplicated rows and headers folded; previous: minor, core-workflow alpha gate added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Forward-looking: where DeckCraft is going and in what order. The one-page summary is
 [ROADMAP.md](../ROADMAP.md); every shortfall is in [gaps.md](gaps.md); numbers are in
@@ -39,33 +20,19 @@ points and lead the beta plan.
 | Present: full-screen show with transitions, animations, media, presenter view with notes, next slide and timer | yes | 48/48 transitions, 64 effects, triggers, builds, media playback, presenter window, See All Slides and zoom. The presenter timer pauses and resets, and notes have a size control. A custom show plays only its slides. Typing a slide number during the show shows it, and Enter goes there. Presenter view isn't placed on the second display automatically (drag it there; #433) | 2–4 |
 | Add business content: tables, charts with their data, simple diagrams | partial (not blocking) | Tables with styles, merge/split, all D or P. Charts insert with the common types and edit data in the Chart Data dialog (P0 partial); SmartArt is basic (pre-drawn shapes) | 12–20 |
 | Share the deck: PDF of slides, notes or handouts; images | yes | `file.export` PDF with text layer, links, bookmarks, handouts 1–9; PNG/JPEG. Artwork is raster in the PDF; no direct print (print the PDF) | 10–16 |
-| Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft` and `.pptx` (#70); spelling is a small built-in list | 4–8 |
-| Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft`; Previous and Next walk every slide and the pane lists them; threads are flattened on `.pptx` save (#70); spelling is a small built-in list | 4–8 |
+| Review: comments with replies, resolve, spelling | partial (not blocking) | Comments, replies and resolve work and survive `.deckcraft` and `.pptx` (#70); Previous and Next walk every slide and the pane lists them; spelling uses installed Hunspell dictionaries (only a short built-in list where none is installed) | 4–8 |
 
 ## Current focus (2026-10-10)
 
 1. **Stop losing work and crashing:** land Close's save prompt (#60, PR #75), the Windows GPU
    startup crashes (#40, #59), image paste on Windows/Linux (#53). 6–12 h.
-2. **PPTX on real decks:** `crates/pptx/tests/corpus.rs` round-trips decks we author (open → save →
-   reopen, parts and text) and keeps a notes master's header and footer. Still open: a larger
-   corpus, comment threads, media options and rewind on save (#70, #74, #77), EMF/WMF and SVG.
-   31–55 h.
-2. **PPTX on real decks:** the owned corpus now round-trips comments, hyperlinks and actions,
-   custom shows, grouped rotated objects, and placeholders that inherit from the layout, and keeps
-   paragraph default formatting and action sounds. Still open: a larger corpus, embedded fonts,
-   comment threads, media options and rewind (#70, #74, #77), EMF/WMF and SVG. 31–55 h.
-2. **PPTX on real decks:** the owned corpus now round-trips text effects, autofit, columns,
-   vertical and RTL text, tab stops, line spacing, theme effects, gradient and pattern fills, 3-D
-   bevels and connectors, and keeps a run's inner shadow, reflection and soft edge plus a bevel
-   preset that had no 3-D XML. Still open: a larger corpus, embedded fonts, comment threads, media
-   options and rewind (#70, #74, #77), EMF/WMF and SVG. 31–55 h.
-2. **PPTX on real decks:** build an owned corpus, round-trip checks in CI, fix what breaks.
-   `corpus_media.rs` keeps SmartArt and OLE XML, media bookmarks and trims, sections, fields, ink,
-   3-D models and animation bounce end. Comment threads, media options and rewind on save
-   (#70, #74, #77), relationship-bearing SmartArt and OLE (#203), and EMF/WMF and SVG are still open. 31–55 h.
-2. **PPTX on real decks:** `crates/pptx/tests/corpus_kinds.rs` round-trips tables, charts, animations,
-   media, sections and masters/layouts, and keeps a handout master's header and footer. Still open:
-   a larger corpus, comment threads, media options and rewind (#70, #74, #77), EMF/WMF and SVG. 31–55 h.
+2. **PPTX on real decks:** the owned corpus (`crates/pptx/tests/corpus*.rs`) round-trips decks we
+   author: tables, charts, animations, media, sections, masters and layouts, comments, links and
+   actions, custom shows, rotated groups, inherited placeholders, text effects and body layout,
+   theme effects, fills, bevels, connectors, 3-D models and animation bounce end, and keeps notes-
+   and handout-master text, paragraph defaults and action sounds. Still open: decks from outside
+   this repo, media options and rewind on save (#74, #77), relationship-bearing SmartArt and OLE
+   (#203), EMF+ records and SVG. 31–55 h.
 3. **Review the open PRs:** equations (#55), browser print (#66), Morph alignment (#67), macOS
    open-with (#68), font lookup (#80), Ukrainian (#34, after the catalog exists). 4–8 h.
 
@@ -84,10 +51,8 @@ Beta means ~75% ready for real work and opening and saving PowerPoint's `.pptx`
 | 6 | Localization infrastructure + zh-Hans, es, fr, de, ja (with IME) | 27–46 | Localization 8 → ~40% |
 | 7 | Font weights (#69), image paste (#53), Tab in text (#78) | 6–11 | Features |
 | 8 | Charts: data grid, elements | 6–10 | Features |
-| 9 | Animation Pane timeline, preview, effect options | 5–8 | Features |
 | 10 | Presenter view on the right display, swap displays | 2–4 | Hardware, Slide show |
-| 9 | Animation Pane timeline, preview from the selected effect, effect options | 4–7 | Features |
-| 10 | Presenter view on the right display, timer controls | 3–5 | Hardware, Slide show |
+| 9 | Animation Pane: preview from the selected effect, effect options (the timeline is in) | 4–7 | Features |
 | 11 | Native macOS menu bar, Format Shape pane depth, start screen and window chrome fixes | 13–22 | UI/UX 60 → 75% |
 | 12 | Performance baseline and the obvious fixes | 4–8 | Performance |
 | **Total** | | **~120–210** | Ready ~55% → ~75% |
@@ -98,15 +63,12 @@ reference renders, a Windows tester with the affected GPUs, native speakers to r
 
 ## After beta: toward full parity (~245–440 h more)
 
-SmartArt editing, chartex chart types, the remaining animation effects and motion paths, Notes and
-Handout masters, edit points, text warp and 3-D, proofing dictionaries, Zoom, recording, video and
-GIF export, legacy `.ppt` import and `.odp` (owner decision), GPU rasterization and hardware video
-decode, the other 21 languages with RTL mirroring, a larger template gallery (six original starters
-ship), and local AI features (owner decision on models). Itemized with hours in [gaps.md](gaps.md).
-GIF export, legacy `.ppt` import and `.odp` (owner decision), GPU rasterization, hardware video
-decode, pen tilt (pressure already scales ink width) and pinch zoom, the other 21 languages with
-RTL mirroring, a larger original template gallery, and local AI features (owner decision on
-models). Itemized with hours in [gaps.md](gaps.md).
+SmartArt depth, the remaining animation effects and motion paths, edit-point segment types and
+3-D depth, bundled proofing dictionaries, Zoom depth, recording, video export, legacy `.ppt` import
+and `.odp` (owner decision), GPU rasterization, hardware video decode, pen tilt (pressure already
+scales ink width) and pinch zoom, the other 21 languages with RTL mirroring, a larger template
+gallery (six original starters ship), and local AI features (owner decision on models). Itemized
+with hours in [gaps.md](gaps.md).
 
 ## Milestones
 
@@ -123,13 +85,8 @@ From the local execution plan (`plan/execution-plan.md`, gitignored). Status as
 | M6 | Transitions and animations | mostly | Animation Pane timeline, remaining effects, transition sounds |
 | M7 | Slide show | mostly | second-display placement, laser, record |
 | M8 | Tables and charts | partly | chart data grid, elements, chartex types, draw table |
-| M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), warp adjust handles |
-| M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), warp gallery and command |
-| M10 | Views | done | grid options, New Window |
-| M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), text warps |
-| M10 | Views | done | grid options, Arrange All |
-| M9 | SmartArt, equations, WordArt | partly | SmartArt text pane and layouts, equations (PR #55), text warps |
-| M10 | Views | done | New Window |
+| M9 | SmartArt, equations, WordArt | partly | SmartArt layouts and PowerPoint-diagram fidelity, equations (PR #55); the text pane, warp gallery and warp handles are in |
+| M10 | Views | done | Arrange All (grid options and New Window are in) |
 | M11 | Output | partly | vector PDF, SVG, GIF, MP4, print |
 | M12 | Review | partly | dictionaries, AutoCorrect, find/replace dialog, compare |
 | M13 | Automation and CLI parity | done | |
@@ -145,10 +102,7 @@ on common paths. On 2026-10-07 it was ~80% there with these blockers:
 | Blocker (2026-10-07) | Status 2026-10-10 |
 |---|---|
 | First real release run: signing, notarization, installers verified on each OS | Signed releases v0.1.0–v0.4.0 published; installers not hand-checked on each OS; Windows startup crashes on some GPUs (#40, #59) |
-| PPTX fidelity on a corpus of real decks | First owned check in CI; notes-master header and footer kept. A larger corpus is still beta item 2 |
-| PPTX fidelity on a corpus of real decks | Owned check for comments, links, custom shows, groups and inherited placeholders. A larger corpus, embedded fonts and #70/#74/#77 stay open; beta item 2 |
-| PPTX fidelity on a corpus of real decks | Owned check for text effects, body layout, theme effects, fills, bevels and connectors. A larger corpus, embedded fonts and #70/#74/#77 stay open; beta item 2 |
-| PPTX fidelity on a corpus of real decks | First owned check of tables, charts, animations, media, sections and masters; handout-master text kept. A larger corpus is still beta item 2 |
+| PPTX fidelity on a corpus of real decks | Owned corpus checks in CI (tables, charts, animations, media, sections, masters, comments, links, custom shows, groups, inherited placeholders, text effects, body layout, theme effects, fills, bevels, connectors, 3-D models); notes- and handout-master text kept. Decks from outside this repo and #74/#77 stay open; beta item 2 |
 | Presenter view and Animation Pane polish | Still open; beta items 9 and 10 |
 | Soak and fuzz the editor | Still open; beta item 1 |
 | UI fidelity pass on the most-used ribbon groups and dialogs; first run | Partly (start-screen fixes #20, #49); beta item 11 |
@@ -161,6 +115,7 @@ plan above.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Community PR wave folded: one Review gate row, one Current focus item 2, one beta row each for items 9 and 10 (timeline and timer controls are in), one after-beta paragraph, one M9 and M10 row, one corpus row in the 2026-10-07 history |
 | 2026-10-13 | trivial | Beta item 3: embedded fonts are in, except MicroType Express subsets |
 | 2026-10-13 | minor | M9: the WordArt Transform gallery applies a text warp; adjust handles stay open |
 | 2026-10-13 | trivial | Owned PPTX corpus check started; notes-master header and footer kept. Beta item 2 stays open for a larger corpus |
diff --git a/docs/slideshow-parity.md b/docs/slideshow-parity.md
index a428f369..921732a5 100644
--- a/docs/slideshow-parity.md
+++ b/docs/slideshow-parity.md
@@ -1,15 +1,6 @@
 # Slide show and presenter view: parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (interactive-deck clicks in the slide show; previous: major (created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu)) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (video seek frame-loss race fixed, upstream #416; previous: major, created; measured from `crates/ui-egui/src/show.rs` and `crates/anim/src/show.rs` against PowerPoint 16.113's Slide Show tab and menu) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (keyboard navigation from Presenter View) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** minor (laser pointer in the show; the presenter window still does not move it; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Show Media Controls hides the show's playback bar and GIF button; breadth stays 66%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (See All Slides and zoom during the show; black and white from the presenter window; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (presenter timer pause/reset, clock and notes size; previous: minor, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (custom show playback; previous: minor, presenter timer pause/reset) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (go to slide shows the number while it is typed; previous: minor, custom show playback) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a trackpad swipe or mouse wheel turns the page during the show; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** major (community PR wave 2026-10-14: interactive decks, laser pointer, See All Slides and zoom, go-to-slide number, custom show playback, presenter timer, clock, notes size and keyboard, Show Media Controls, swipe; breadth 68%; duplicated rows and headers folded; previous: major, created) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 Presenting is the job PowerPoint is hired for. This doc covers the show window, presenter view,
 rehearsal and recording. Transition and animation playback are in
@@ -35,10 +26,7 @@ ready** (estimated), **10–16 h** to parity.
 | A slide the show returns to (link, arrow keys) looks as it was left; a triggered animation goes on where it stopped | yes | yes | A main-sequence step still playing when the show leaves is finished |
 | "Advance on click" off: a click never leaves the slide (animation steps still play, keys still move on) | yes | yes | |
 | Hyperlinks and action settings followed (slides, web, mail, End Show, Last Viewed, Custom Show) | yes | yes | Only `http(s)` and `mailto` open outside the show, by design (`safe_url`). A Custom Show action plays that show |
-| Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable |
-| Media playback with controls, play across slides, full-screen video | yes | yes | Seeks and loops preserve new-generation video frames and end-of-stream; queue regression and repeated seeks across H.264/HEVC/VP9/AV1 in `crates/media`. WMA/WMV not decodable |
-| Media playback with controls, play across slides, full-screen video, Play/Pause/Stop in the click sequence | yes | yes | WMA/WMV not decodable; click sequence since #116 |
-| Media playback with controls, play across slides, full-screen video | yes | yes | WMA/WMV not decodable. Slide Show ▸ Show Media Controls (on by default) hides the playback bar |
+| Media playback with controls, play across slides, full-screen video, Play/Pause/Stop in the click sequence | yes | yes | WMA/WMV not decodable. Click sequence since #116. Slide Show ▸ Show Media Controls (on by default) hides the playback bar. Seeks and loops preserve new-generation video frames and end-of-stream; queue regression and repeated seeks across H.264/HEVC/VP9/AV1 in `crates/media` |
 | Animated GIFs play; pause from their corner button | yes | yes (#39) | The corner button hides with Show Media Controls |
 | See All Slides grid during the show | yes | yes: G, or All on the show bar and in presenter view; click a thumbnail, Esc closes the grid | Hidden slides are labelled; the first 48 slides are shown |
 | Zoom into part of a slide during the show | yes | yes: Z, then click the slide (or the presenter slide); 2×, Esc or another click leaves it | The presenter keeps the whole slide and draws a frame on the zoomed part |
@@ -61,7 +49,7 @@ ready** (estimated), **10–16 h** to parity.
 | Notes font size, scrolling | yes | yes: A- / A+ (and `[` / `]`), 12–48 pt in steps of 4, default 18; the notes scroll | |
 | Placed on the presenter's display automatically, show on the projector | yes | **no**: opens wherever the OS puts it | Beta blocker, 3–5 h. Open PR #433 places the show on a second display when one is attached. This change does not |
 | Swap displays | yes | no | Still open on #433 |
-| Pen, laser, black screen, zoom from presenter view | yes | Black, White and Zoom buttons; the audience zoom is framed on the presenter slide | Pen and the laser pointer are still keys only; there is no laser yet |
+| Pen, laser, black screen, zoom from presenter view | yes | Black, White and Zoom buttons; the audience zoom is framed on the presenter slide | Pen and laser are driven from the audience window only; the presenter window does not move the laser dot |
 | See all slides from presenter view | yes | yes: All slides opens the grid on the show | |
 | Rehearse with Coach (Speaker Coach) | yes (cloud) | no | AI dimension |
 
@@ -82,11 +70,8 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Work | Hours |
 |---|---|
-| Presenter view on the right display, swap displays, pause/reset timer, clock, notes size | 3–5 |
 | Highlighter, eraser, keep-annotations prompt, laser from presenter view | 2–4 |
-| See All Slides and zoom during the show | 2–3 |
 | Presenter view on the right display and a swap-displays command | 2–4 |
-| Laser pointer, highlighter, eraser, keep-annotations prompt | 2–4 |
 | Record slide show with narration (no camera) | 5–8 |
 | **Total** | **~9–16** (the slide-show row of the feature table carries 10–16 h; recording overlaps the Media row) |
 
@@ -94,6 +79,7 @@ Reading View in a window with navigation: present (checklist row done).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | trivial | Community PR wave folded: one media playback row, the presenter pen/laser row matches the laser that exists, estimates keep only the open work (~9–16 h); checklist breadth 68% |
 | 2026-10-13 | minor | Click handling for interactive decks: triggers, per-slide state kept across visits, visible-shape hit testing with hand cursor, advance on click |
 | 2026-10-13 | minor | Video seek handoff no longer discards freshly decoded frames or end-of-stream (upstream #416); deterministic queue and four-codec seek regression tests |
 | 2026-10-14 | minor | Presenter View handles slideshow keys in its own viewport, including returning from the end screen and Escape; regression tests cover navigation and avoiding duplicate button activation |
diff --git a/docs/target-app-parity.md b/docs/target-app-parity.md
index 1bcff00a..aa1893ac 100644
--- a/docs/target-app-parity.md
+++ b/docs/target-app-parity.md
@@ -1,29 +1,6 @@
 # DeckCraft vs Microsoft PowerPoint: parity assessment
 
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (text-warp shortfall is adjust handles; the Transform gallery applies a preset) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (media remainder no longer lists icons: Insert › Icons is a Lucide stroke set; percentages unchanged; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (227 commands; breadth stays 79%, ready stays ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (228 commands; previous/next comment; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-14 · **Change:** minor (six original starter decks; ecosystem stays ~25% until the gallery is large; previous: minor, hours to ~95% per audience added; ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (automation 227 commands; breadth stays 79%, ready ~55%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (automation 228 commands; breadth stays 79%, ready ~55%; previous: trivial, automation 227 commands) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors noted under what works today; percentages unchanged; previous: hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts noted under what works today; percentages unchanged; previous: hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Zoom dialog; breadth stays 79%; previous: minor, hours to ~95%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show lists See All Slides and zoom; breadth stays 79%; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show lists presenter timer pause/reset, clock and notes size; breadth stays 79%; previous: trivial, See All Slides and zoom) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (slide show plays a custom show; breadth stays 79%; previous: trivial, presenter timer) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (go to slide shows the typed number; breadth stays 79%; previous: trivial, custom show playback) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (essentials discount no longer cites the palette Export failure, #79; percentages unchanged; previous: minor, hours to ~95% per audience) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; percentages unchanged; previous: hours to ~95% per audience, ready ~55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers; automation counted at 236 commands; the menu measurement and the d556ff9 snapshot still count 226; percentages unchanged; previous: hours to ~95% per audience, ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; percentages unchanged; previous: hours to ~95% per audience, ready ~55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (Preview in editor re-scored done; breadth 79% → 80%, Animations 79% → 85%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (227 commands; previous: minor, hours to ~95% per audience added; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (229 commands; previous: trivial, 227 commands; ready stays ~55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Views: Grid Options landed; New Window remains; previous: hours to ~95% per audience added; ready 56% → 55%) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (text-warp shortfall is the gallery and command; adjust handles drag) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (pen pressure scales ink; percentages unchanged; previous: minor, hours to ~95% per audience added; ready recomputed from written weights, 56% → 55%; stage stays alpha) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** major (community PR wave 2026-10-14: breadth 84% over 191 features (P0 92%, P1 82%, P2 55%) after `cargo xtask parity`; area table and What works today folded to one row or bullet each; 320 engine commands; ready ~55% and stage alpha unchanged; previous: minor, hours to ~95% per audience added) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 The authoritative answer to "how close is DeckCraft to PowerPoint, and how much work is left?".
 [ROADMAP.md](../ROADMAP.md) summarizes it; [gaps.md](gaps.md) itemizes every shortfall;
@@ -34,9 +11,8 @@ number.
 
 | Number | Value | Kind |
 |---|---|---|
-| **Feature breadth** (weighted checklist) | **79%** over 191 features (P0 92%, P1 75%, P2 39%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md) |
-| **Feature breadth** (weighted checklist) | **80%** over 191 features (P0 92%, P1 75%, P2 36%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md); Preview in editor re-scored 2026-10-13 |
-| Menu-bar coverage | **59%** (128 of 217 app-specific PowerPoint menu items have a DeckCraft command or UI label of the same name) | **measured** (heuristic lower bound): script matching the 2026-10-07 PowerPoint menu dump against the 226 engine command labels and the UI's strings; excludes the app, Window and Help menus and the subtitle language lists |
+| **Feature breadth** (weighted checklist) | **84%** over 191 features (P0 92%, P1 82%, P2 55%) | **measured**: `cargo xtask parity` formula over [parity-checklist.md](parity-checklist.md); rows re-scored by the 2026-10-14 community PR wave |
+| Menu-bar coverage | **59%** (128 of 217 app-specific PowerPoint menu items have a DeckCraft command or UI label of the same name) | **measured** (heuristic lower bound): script matching the 2026-10-07 PowerPoint menu dump against the 226 engine command labels of the d556ff9 snapshot (not re-measured since; the registry is 320 now) and the UI's strings; excludes the app, Window and Help menus and the subtitle language lists |
 | **Ready for real work** | **~55%** | **estimated**: weighted dimension table below (was ~56% until the features row was recomputed from written area weights) |
 | **Mainstream practitioner** | **~53%** | **estimated**: [method below](#mainstream-practitioner-and-essentials-user) |
 | **Essentials user** | **~62%** | **estimated**: [method below](#mainstream-practitioner-and-essentials-user) |
@@ -88,7 +64,7 @@ The weights are what those users actually depend on, written down so the total c
 
 | Dimension | Weight | Ready | Hours to full | Doc | Evidence |
 |---|---:|---:|---|---|---|
-| Features (breadth × depth) | 30% | ~62% | 140–240 | [parity-checklist.md](parity-checklist.md), [animation-parity.md](animation-parity.md), [slideshow-parity.md](slideshow-parity.md) | Breadth 80% measured. Depth lags: partial rows remain, and users found depth bugs in rows scored done within two days (#53, #60, #69, #70, #74, #77, #78) |
+| Features (breadth × depth) | 30% | ~62% | 140–240 | [parity-checklist.md](parity-checklist.md), [animation-parity.md](animation-parity.md), [slideshow-parity.md](slideshow-parity.md) | Breadth 84% measured. Depth lags: partial rows remain, and users found depth bugs in rows scored done within two days (#53, #60, #69, #70, #74, #77, #78) |
 | File formats | 20% | ~58% | 60–110 | [file-format-parity.md](file-format-parity.md) | PPTX reads and writes every main part and keeps unknown objects; files open in PowerPoint without repair. But it has never met a corpus of real decks, EMF/WMF/SVG pictures don't decode, comments/media/rewind settings are lost on round trip, and there is no `.ppt`, `.pptm`, `.odp`, video or GIF export |
 | UI/UX fidelity | 15% | ~60% | 30–50 | [ui-parity.md](ui-parity.md) | All 10 ribbon tabs and the contextual tabs exist; Format Shape pane, Animation Pane, dialogs and menus are thinner than PowerPoint's; no native macOS menu bar; user reports #17, #71, #73, #76 |
 | Stability | 10% | ~60% | 10–20 | [gaps.md](gaps.md) | Never-crash rules, a panic guard round every command, PPTX fuzz/malformed tests. But startup crashes on some Windows GPUs (#40, #59) and Close discards edits without asking (#60) |
@@ -198,41 +174,34 @@ mainstream number leaves out.
 
 Breadth is measured from the checklist; "ready" adds depth and is estimated. Hours are to
 PowerPoint parity for that area. **Weight** is how much a PowerPoint user relies on the area
-(points out of 110); the total "ready" is the weighted mean of the rows (6,865 / 110 = 62.4%), and
-it is the Features row of the dimension table. Automation and Platforms are scored elsewhere.
+(points out of 110); the total "ready" is the weighted mean of the rows (6,905 / 110 = 62.8%; the
+Features row of the dimension table keeps ~62% until the next full re-measure). Automation and Platforms are scored elsewhere.
 
 | Area | Weight | Breadth (measured) | Ready (est.) | Hours | Main shortfalls | Doc |
 |---|---:|---:|---:|---|---|---|
-| Application shell | 5 | 71% | ~55% | 8–14 | No native macOS menu bar, thin start screen (templates, recent), one window per presentation missing | [ui-parity.md](ui-parity.md) |
-| Files (commands) | 4 | 69% | ~50% | see file formats | Print, reuse slides, passwords, legacy and macro formats | [file-format-parity.md](file-format-parity.md) |
-| Slides and sections | 6 | 90% | ~85% | 3–5 | Zoom (summary/section/slide), copying slides between decks keeps formatting only partly | [parity-checklist.md](parity-checklist.md) |
-| Views | 4 | 90% | ~80% | 3–6 | Snap to grid and grid options, Arrange All | [ui-parity.md](ui-parity.md) |
-| Views | 4 | 90% | ~80% | 3–5 | New Window | [ui-parity.md](ui-parity.md) |
-| Masters and themes | 7 | 85% | ~70% | 8–14 | Notes and Handout masters, theme variants, `.thmx`, effect schemes | [parity-checklist.md](parity-checklist.md) |
-| Shapes | 7 | 86% | ~75% | 8–14 | Edit points, warp adjust handles, WordArt depth | [ui-parity.md](ui-parity.md) |
-| Views | 4 | 90% | ~80% | 3–6 | Snap to grid and grid options, New Window | [ui-parity.md](ui-parity.md) |
-| Masters and themes | 7 | 85% | ~70% | 8–14 | Notes and Handout masters, theme variants, `.thmx` | [parity-checklist.md](parity-checklist.md) |
-| Shapes | 7 | 86% | ~75% | 8–14 | Edit points, text warp, WordArt depth | [ui-parity.md](ui-parity.md) |
-| Shapes | 7 | 86% | ~75% | 8–14 | Edit points, warp gallery and command, WordArt depth | [ui-parity.md](ui-parity.md) |
-| Format (fill, line, effects) | 6 | 81% | ~65% | 8–14 | Format Shape pane depth, bevel and 3-D, picture/texture fill options | [ui-parity.md](ui-parity.md) |
+| Application shell | 5 | 81% | ~55% | 8–14 | No native macOS menu bar, contextual tabs and multiple-window handling thinner than PowerPoint's | [ui-parity.md](ui-parity.md) |
+| Files (commands) | 4 | 75% | ~50% | see file formats | Print, passwords, legacy and macro formats, video export; reuse slides is partial | [file-format-parity.md](file-format-parity.md) |
+| Slides and sections | 6 | 92% | ~85% | 3–5 | Zoom (summary/section/slide) is partial, copying slides between decks keeps formatting only partly | [parity-checklist.md](parity-checklist.md) |
+| Views | 4 | 98% | ~80% | 3–6 | Arrange All (Grid Options and New Window are in) | [ui-parity.md](ui-parity.md) |
+| Masters and themes | 7 | 92% | ~70% | 8–14 | Notes/Handout master view polish, effect-scheme depth, Designer suggestions | [parity-checklist.md](parity-checklist.md) |
+| Shapes | 7 | 91% | ~75% | 8–14 | Edit points depth, WordArt depth (the Transform gallery and warp adjust handles are in) | [ui-parity.md](ui-parity.md) |
+| Format (fill, line, effects) | 6 | 83% | ~65% | 8–14 | Format Shape pane depth, bevel and 3-D, picture/texture fill options | [ui-parity.md](ui-parity.md) |
 | Arrange | 3 | 100% | ~90% | 1–2 | Align to slide vs selected as a menu choice, More Rotation Options | [ui-parity.md](ui-parity.md) |
-| Text | 15 | 80% | ~62% | 18–30 | Font weights beyond Regular/Bold/Italic (#69), Tab in text boxes (#78), IME, true vertical CJK, dictionaries, AutoCorrect, thesaurus, equations (PR #55 open) | [localization-parity.md](localization-parity.md) |
-| Tables | 5 | 89% | ~75% | 3–6 | Draw table, borders and cell effects depth | [parity-checklist.md](parity-checklist.md) |
+| Text | 15 | 83% | ~62% | 18–30 | Font weights beyond Regular/Bold/Italic (#69), true vertical CJK, dictionaries, AutoFormat as you type, thesaurus depth, equations (PR #55 open) | [localization-parity.md](localization-parity.md) |
+| Tables | 5 | 97% | ~75% | 3–6 | Draw table depth, borders and cell effects depth | [parity-checklist.md](parity-checklist.md) |
 | Charts | 7 | 65% | ~45% | 12–20 | Data grid editing, chart elements, the `chartex` types (waterfall, funnel, treemap, sunburst, histogram, box) | [parity-checklist.md](parity-checklist.md) |
 | SmartArt | 4 | 50% | ~35% | 8–14 | PowerPoint diagrams editable (read their data model), the data model on save, more layouts | [parity-checklist.md](parity-checklist.md) |
-| Pictures | 7 | 48% | ~45% | 12–20 | SVG/EMF/WMF, clipboard paste on Windows/Linux (#53), artistic effects, remove background, compress | [file-format-parity.md](file-format-parity.md) |
+| Pictures | 7 | 60% | ~45% | 12–20 | SVG, EMF+ records, clipboard paste on Windows/Linux (#53), remove background, artistic-effect and correction depth | [file-format-parity.md](file-format-parity.md) |
 | Media | 4 | 67% | ~60% | 8–14 | WMA/WMV decode, record audio/screen, 3-D models and stock content, playback options lost on PPTX round trip (#74) | [file-format-parity.md](file-format-parity.md) |
-| Transitions | 4 | 92% | ~80% | 4–8 | Transition sounds, 3-D transitions approximated in 2-D | [animation-parity.md](animation-parity.md) |
-| Animations | 6 | 79% | ~65% | 10–16 | 64 of PowerPoint's ~190 effects, Animation Pane timeline, preview, rewind lost on save (#77) | [animation-parity.md](animation-parity.md) |
-| Slide show and presenter view | 8 | 68% | ~60% | 10–16 | Second-display placement, laser from presenter view, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
+| Transitions | 4 | 100% | ~80% | 4–8 | 3-D transitions approximated in 2-D | [animation-parity.md](animation-parity.md) |
 | Animations | 6 | 85% | ~65% | 10–16 | 64 of PowerPoint's ~190 effects, Animation Pane timeline, preview from the selected effect, rewind lost on save (#77) | [animation-parity.md](animation-parity.md) |
-| Slide show and presenter view | 8 | 66% | ~60% | 10–16 | Second-display placement, laser pointer, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
-| Review | 3 | 60% | ~45% | 8–14 | Modern comment threads on round trip (#70), compare, version history, real spelling dictionaries | [file-format-parity.md](file-format-parity.md) |
-| Draw (ink) | 2 | 33% | ~30% | 5–9 | Pen tilt, ink to shape/text/math, lasso | [hardware-parity.md](hardware-parity.md) |
-| Undo and clipboard | 3 | 88% | ~75% | 3–5 | Paste Special, image paste (#53) | [ui-parity.md](ui-parity.md) |
+| Slide show and presenter view | 8 | 68% | ~60% | 10–16 | Second-display placement, laser from presenter view, recording, subtitles, ink depth | [slideshow-parity.md](slideshow-parity.md) |
+| Review | 3 | 70% | ~45% | 8–14 | Compare depth, version history, real spelling dictionaries | [file-format-parity.md](file-format-parity.md) |
+| Draw (ink) | 2 | 50% | ~30% | 5–9 | Pen tilt, ink to math, lasso, ink to shape/text depth | [hardware-parity.md](hardware-parity.md) |
+| Undo and clipboard | 3 | 100% | ~75% | 3–5 | Image paste (#53) | [ui-parity.md](ui-parity.md) |
 | Automation ✱ | — | 100% | ahead | 0 | | [mcp.md](mcp.md) |
 | Platforms ✱ | — | 67% | ~80% | see platforms | | [ROADMAP.md](../ROADMAP.md) |
-| **Total (feature areas)** | 110 | **80%** | **~62%** | **~140–240** | | |
+| **Total (feature areas)** | 110 | **84%** | **~62%** | **~140–240** | | |
 
 ## What works today (evidence)
 
@@ -241,20 +210,15 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Document model:** presentations, slides, masters and 11 standard layouts with placeholder
   inheritance (slide → layout → master → theme), sections, notes, comments, custom shows,
   header/footer fields, embedded media, unlimited undo on shared slide snapshots.
-- **Themes:** 8 original themes with colour and font schemes, custom colours and fonts,
-  backgrounds (solid, gradient, picture, pattern), slide size presets. File › New also offers 6
-  original starter decks (Briefing, Lesson, Pitch, Field Notes, Quarterly, Evening Talk).
-  backgrounds (solid, gradient, picture, pattern), slide size presets. Design › Colors ›
-  Customize Colors… opens Create New Theme Colors and edits the open master's twelve theme
-  colours (one scheme on that master, not a library of saved schemes).
-  backgrounds (solid, gradient, picture, pattern), slide size presets. Design › Fonts ›
-  Customize Fonts… opens Create New Theme Fonts and edits the open master's heading and body
-  latin faces (one scheme on that master, not a library of saved font schemes, and not East
-  Asian or complex-script faces).
-  effect schemes (Design ▸ Effects: DeckCraft, Soft, Crisp, Lift, Glow, Plain),
-  backgrounds (solid, gradient, picture, pattern; a solid fill's transparency; picture
-  transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture),
-  slide size presets.
+- **Themes:** 8 original themes with colour and font schemes, custom colours and fonts
+  (Design › Colors › Customize Colors… and Design › Fonts › Customize Fonts… open Create New
+  Theme Colors and Create New Theme Fonts on the open master: its twelve theme colours, its
+  heading and body latin faces; one scheme on that master, not a library of saved schemes),
+  effect schemes (Design ▸ Effects: DeckCraft, Soft, Crisp, Lift, Glow, Plain), backgrounds
+  (solid, gradient, picture, pattern; a solid fill's transparency; picture transparency, tile,
+  offset, scale, alignment and mirror; Apply to All copies a picture), slide size presets. File ›
+  New also offers 6 original starter decks (Briefing, Lesson, Pitch, Field Notes, Quarterly,
+  Evening Talk).
 - **Shapes:** ~180 preset geometries with adjustment handles, text boxes, pictures (crop,
   corrections, animated GIFs that play and pause), tables with styles, charts (column, bar, line,
   area, pie, doughnut, scatter and more), basic SmartArt, groups, connectors glued to sites,
@@ -271,38 +235,25 @@ Carried from the 2026-10-07 ROADMAP status and updated with what has landed sinc
 - **Transitions and animations:** 48 transitions including Morph (objects, words, characters,
   geometry outlines), 64 animation effects (entrance, emphasis, exit, motion paths, media),
   triggers, by-paragraph builds, Animation Painter, on a shared timeline engine.
-- **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide (the typed number is shown), See All
-  Slides, click-to-zoom, pen, presenter window (black, white, zoom, the slide grid, a timer that
-  pauses and resets, a local clock, and notes size), rehearse timings, custom shows played on
-  their own, Set Up Show, Reading View; links and shape actions followed on click.
-- **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom;
-  grayscale.
-- **Review:** comments with replies and resolve, previous and next across the deck, accessibility checker, a basic spelling list.
-- **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master; zoom
-  (dialog: percent or Fit); grayscale.
-- **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide, pen,
-  presenter window, rehearse timings, custom shows, Set Up Show, Reading View; links and shape
+- **Slide show:** full screen, keyboard/mouse navigation, blank screens, go-to-slide (the typed
+  number is shown), See All Slides, click-to-zoom, pen, laser pointer, presenter window (black,
+  white, zoom, the slide grid, a timer that pauses and resets, a local clock, and notes size),
+  rehearse timings, custom shows played on their own, Set Up Show, Reading View; links and shape
   actions followed on click.
 - **Views:** Normal, Outline, Slide Sorter, Notes Page, Reading View, Slide Master (Preserve on
-  the open master or layout, and Title and Footers placeholders); zoom; grayscale.
-- **Review:** comments with replies and resolve, accessibility checker, a basic spelling list.
+  the open master or layout, and Title and Footers placeholders); zoom (dialog: percent or Fit);
+  Grid Options; New Window; grayscale.
+- **Review:** comments with replies and resolve, previous and next across the deck, accessibility
+  checker, a basic spelling list.
 - **Media:** MP3, AAC/M4A, ALAC, WAV, AIFF, CAF, FLAC, Ogg Vorbis and Opus audio; H.264, HEVC,
   VP9 and AV1 video in MP4/MOV/WebM/MKV with pure-Rust decoders; poster frames, trim, fades,
   volume, loop, play across slides.
 - **Files:** `.deckcraft` (zip + JSON), PPTX import/export (also opens `.potx`/`.ppsx`), PDF
   export (slides, notes, handouts 1–9 per page, text layer, links, bookmarks), PNG/JPEG, outline
   text, AutoRecover.
-- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-- **Automation:** 228 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-- **Automation:** 228 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-- **Automation:** 229 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-  and MCP.
-- **Automation:** 227 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-  and MCP. The menu-bar measurement and the d556ff9 snapshot still count 226.
-- **Automation:** 236 commands, every one reachable from `deckcraft-cli`, the JSON control channel
-  and MCP. The menu-bar measurement and the d556ff9 snapshot still count 226 commands.
+- **Automation:** 320 engine commands (`cmd!` registrations in `crates/engine/src/cmd/*`), every
+  one reachable from `deckcraft-cli`, the JSON control channel and MCP. The menu-bar measurement
+  and the d556ff9 snapshot still count 226.
 - **Platforms:** signed releases for macOS (universal), Windows x64/x86/arm64, Linux
   (AppImage/deb/rpm/tar.gz/Flatpak, x86_64 and aarch64), FreeBSD and the web (v0.4.0, 2026-10-09).
 
@@ -338,6 +289,7 @@ scored done (16 open issues).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Community PR wave folded: one headline breadth row (84% over 191 features after `cargo xtask parity`; duplicate checklist rows removed), one row per feature area with the latest breadth and shortfalls, one Themes / Slide show / Views / Review / Automation bullet each (320 engine commands). SmartArt ready ~35% (Text Pane, 6e40335) moves the area mean to 62.8%; dimension and headline percentages unchanged |
 | 2026-10-13 | minor | Shapes shortfall "text warp" narrowed to adjust handles: the Transform gallery applies a preset |
 | 2026-10-14 | minor | Media remainder: Insert › Icons places Lucide stroke icons. 3-D models and stock content remain. Headline percentages unchanged; the checklist row stays missing |
 | 2026-10-14 | trivial | Size and Position dialog. Command count 226 → 227. Breadth stays 79%, ready stays ~55%, UI stays ~60% |
diff --git a/docs/ui-parity.md b/docs/ui-parity.md
index 0224f768..cc7801d7 100644
--- a/docs/ui-parity.md
+++ b/docs/ui-parity.md
@@ -1,42 +1,6 @@
 # UI parity with PowerPoint
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (Eyedropper in the colour menus (#367); previously minor: File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (Export button in the title bar; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (right click selects the shape under the pointer; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt Transform gallery; previous: File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Icons is a Lucide stroke gallery; ribbon icons stay original drawings; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Size and Position dialog; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Comments pane lists every slide; Review Previous/Next; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (View › New Window opens a second window on the same presentation; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Photo Album dialog; 28 dialogs; breadth stays 79%, UI ~60%; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Edit Photo Album reuses the Photo Album dialog; 28 dialogs; breadth stays 79%, UI ~60%; previous: trivial, Photo Album dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Alt Text dialog's decorative checkbox follows the selection; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Hyperlink dialog follows the selection; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Date and Time dialog; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Zoom dialog: percent or Fit, applies on OK; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-13 · **Change:** trivial (command search skips Export without a path, #79; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Trim Media dialog follows the selection; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-14 · **Change:** minor (copy and paste rich text and pictures with other apps; previous: text editing keys, #268, and File tab, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (animation preview on the editor canvas; previous: File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** trivial (Format Shape fill transparency follows the selection; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (Grid Options dialog; previous: File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** minor (WordArt adjust handles; previous: File tab / Backstage, #76; previous: off-slide objects in Normal view, #270) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-14 · **Change:** minor (File › New starter decks; previous: minor, text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Sorter sections: add, rename, collapse, drag a whole section; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Colors; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Create New Theme Fonts; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Insert › Date and Time dialog; previous: text editing keys, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Design ▸ Effects; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Slide Master Preserve and Title/Footers placeholders; previous: text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Format Background picture and solid options; dialogs stay 27) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-12 · **Last updated:** 2026-10-14 · **Change:** minor (copy and paste rich text and pictures with other apps; previous: text editing keys, #268, and File tab, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Font dialog; previous: minor, text editing keys observed in PowerPoint for Windows, #268) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
-> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (Paragraph dialog; previous: minor, Font dialog) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
+> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** major (community PR wave 2026-10-14: 14 new dialogs (41 in all), Eyedropper, Export button, New Window, Grid Options, WordArt gallery and handles, Slide Sorter sections, Quick Access Toolbar, Format Background and Format Shape depth, rich-text clipboard; duplicated rows and headers folded; previous: minor, File tab / Backstage, #76) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
 
 How DeckCraft looks and feels next to PowerPoint: the shell, the ribbon, menus, panes, dialogs,
 direct manipulation, keyboard and precision. Observations of PowerPoint are kept locally in
@@ -59,8 +23,6 @@ AGENTS.md §2). Dimension score: **~60% ready** (estimated), **30–50 h** to pa
 | Command search (Tell Me) | yes | command palette | |
 | Light / dark appearance | follows the system | light or dark; doesn't follow the system (#41) | 1–2 h |
 | One window per presentation, New Window, Arrange All | yes | New Window opens one more window on the same presentation (its own slide, live with edits); tabs stay in the first window; no Arrange All | Arrange All |
-| Quick Access Toolbar customization | yes | no | P1 partial |
-| One window per presentation, New Window, Arrange All | yes | tabs in one window; no New Window | 3–5 h |
 | Quick Access Toolbar customization | yes | yes: Customize menu (common commands, reset), right-click any ribbon button to add, right-click a toolbar button to remove; saved with the UI state | done |
 
 ## File tab (Backstage)
@@ -96,36 +58,14 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Pane / dialog | PowerPoint | DeckCraft |
 |---|---|---|
 | Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill (solid transparency follows the selection), gradient editor, picture/texture fill (source, tile, offsets, scale, alignment, mirror, transparency, rotate with shape), line (dash, compound, cap, join, begin/end arrows and sizes), shadow/glow/reflection details (colour, transparency, blur, angle, distance, size), soft edges, 3-D format and rotation (bevels, depth, contour, material, lighting, camera presets, X/Y/Z rotation), size (lock aspect ratio) |
-| Format Background pane | yes | yes |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line (dash, compound, cap, join, begin/end arrows and sizes), some effects, size (lock aspect ratio); no 3-D, thin picture/texture options |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, line, shadow/glow/reflection details (colour, transparency, blur, angle, distance, size), soft edges, size; no 3-D, thin picture/texture options |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill (solid transparency follows the selection), gradient editor, line, some effects, size; no 3-D, thin picture/texture options |
-| Format Shape / Picture / Text pane (Fill & Line, Effects, Size & Properties, Picture, Text Box) | full | partial: fill, gradient editor, picture/texture fill (source, tile, offsets, scale, alignment, mirror, transparency, rotate with shape), line, some effects, size; no 3-D |
 | Slide Master | Insert Layout, Rename, Delete, Preserve, Insert Placeholder, Title and Footers | Insert Layout, Rename, Delete, Insert Placeholder, and Preserve, Title and Footers checkboxes (`master.preserve`, `master.placeholders`). A master thumbnail selects the master |
 | Format Background pane | yes | yes: solid transparency; picture transparency, tile, offset, scale, alignment and mirror; Apply to All copies a picture. Stretch insets and rotate-with-shape are command parameters |
 | Selection Pane | front-most first, groups fold, drag to restack, Bring Forward / Send Backward arrows, Show All / Hide All, eye, padlock (Lock), rename in place | same: drag restacks among siblings (a child stays in its group), Ctrl+click toggles, Shift+click selects a run, arrows / Home / End / F2 / Esc in the list, right-click menu |
-| Animation Pane | list + advanced timeline | list, reorder, timing; no timeline |
 | Comments pane (threads) | yes | yes: every slide, with Previous and Next on the Review tab |
-| Animation Pane | list + advanced timeline | list, reorder, timing, play the current slide on the canvas; no timeline |
-| Comments pane (threads) | yes | yes |
+| Animation Pane | list + advanced timeline | list, reorder, timing, an advanced timeline with draggable bars, play the current slide on the canvas; no preview from the selected effect |
 | Design Ideas (Designer) | yes (cloud) | no |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Size and Position, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Photo Album, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Photo Album, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Photo Album, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Photo Album (Edit Photo Album reopens this dialog), Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages, Create New Theme Colors |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages, Create New Theme Fonts |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Replace Fonts, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text (decorative follows the selection), Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink (address, slide and ScreenTip follow the selection), Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Date and Time, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom (percent or Fit, applies on OK), Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
+| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Photo Album, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 41 (`crates/ui-egui/src/dialogs.rs`): Font, Paragraph, Tabs, Bullets and Numbering, Find and Replace, Replace Fonts, Table, Slide Size, Size and Position, Header and Footer, Date and Time, Hyperlink (address, slide and ScreenTip follow the selection), Action Settings, Set Up Show, Zoom (percent or Fit, applies on OK), Comment, Alt Text (decorative follows the selection), Outline, Rename (section, shape, layout), About, Preferences, AutoCorrect, Grid Options, Export, Symbol, Photo Album (Edit Photo Album reopens this dialog), Paste Special, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media (start, end and fades follow the selection), SmartArt chooser, Create New Theme Colors, Create New Theme Fonts, Quit, Notes Pages |
 | Design ▸ Effects | named theme effect schemes | DeckCraft, Soft, Crisp, Lift, Glow and Plain (`design.effects`); colours and fonts stay |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 27 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media (start, end and fades follow the selection), SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Font, Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 29 (`crates/ui-egui/src/dialogs.rs`): Font, Paragraph, Tabs, Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Grid Options, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
-| Dialogs | ~60 (Font, Paragraph, Bullets and Numbering, Find, Replace, Replace Fonts, Hyperlink, Action Settings, Header and Footer, Slide Size, Set Up Show, Custom Shows, Print, Page Setup, Insert Object, Symbol, Equation, Chart data sheet, SmartArt chooser, Preferences…) | 28 (`crates/ui-egui/src/dialogs.rs`): Find and Replace, Table, Slide Size, Header and Footer, Hyperlink, Set Up Show, Zoom, Comment, Alt Text, Outline, Rename (section, shape, layout), Paragraph, About, Preferences, Export, Symbol, Equation (placeholder), Spelling, Accessibility, Language, Custom Shows, Chart Data, Trim Media, SmartArt chooser, Quit, Notes Pages |
 
 ## Direct manipulation
 
@@ -140,22 +80,17 @@ menu colours taken from the theme tokens (menu `chrome`, page `card`).
 | Shift-constrained move, Option-drag to duplicate | yes | yes |
 | Connector glue and rerouting | yes | yes |
 | Edit points on freeforms | yes | partial: Edit Shape ▸ Edit Points turns any shape into a freeform; drag vertices and their Bézier handles, Ctrl/Cmd-click to add or delete, right-click for Smooth/Straight/Corner Point and Delete Point; no Straight/Curved Segment or Open/Close Path yet |
-| Edit points on freeforms | yes | **no** |
 | WordArt adjust handles | yellow handles on transformed text | yes, one per adjust when the text has a warp; dragging sets that guide value |
 | Crop handles, crop to shape, aspect ratio | yes | partial |
 | Text caret, selection, double/triple click, drag-select | yes | yes |
 | Exact size/position, lock aspect | yes | yes — Size and Position dialog (height, width, rotation, scale %, lock aspect, position from the top-left), one undo step; ribbon spinners still resize one side at a time |
 | Drag the frame of a text box being edited to move it | yes | yes |
 | Table cells: caret and selection in the cell, click into another cell, drag row and column borders | yes | yes; no cell-range selection by dragging across cells |
-| Rulers with indent markers and tab stops | yes | rulers yes; tab stops partial |
 | Context menus on shapes, slides, text, thumbnails | yes | yes, shorter; a right click selects the shape under the pointer first |
-| WordArt transform | Transform gallery | Shape Format ▸ Text Effects ▸ Transform (`format.textWarp`): No Transform, Follow Path and the other 36 presets. No adjust handles |
-| Exact size/position, lock aspect | yes | yes |
+| WordArt transform | Transform gallery | Shape Format ▸ Text Effects ▸ Transform (`format.textWarp`): No Transform, Follow Path and the other 36 presets. Adjust handles: see WordArt adjust handles |
 | Rulers with indent markers and tab stops | yes | yes: indent markers and tab stops drag on the ruler (a click adds a tab, the corner selector picks its kind); Tabs dialog from Home › Paragraph and the Paragraph dialog |
-| Context menus on shapes, slides, text, thumbnails | yes | yes, shorter |
 | Drag and drop of files and between thumbnails | yes | yes |
 | Slide Sorter sections: a bar per section, add, rename in place, collapse, drag the whole section (its slides move with it) | yes | yes |
-| Image paste from the clipboard | yes | macOS yes; Windows and Linux no (#53) |
 | Image paste from the clipboard | yes | macOS pastes a picture when the paste carries no text (TIFF), and rich text copies and pastes as HTML (bold, italic, underline). Windows and Linux image paste stays #53 |
 | Font menu: every installed family with its faces | yes | families yes; only Regular/Bold/Italic faces (#69) |
 
@@ -211,26 +146,19 @@ consistency is open (#73, #56).
 |---|---|
 | Native macOS menu bar from `menu_tree()`, filled out to PowerPoint's menu items | 3–5 |
 | Format Shape pane depth | 6–10 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object; Create New Theme Colors is in) | 8–14 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object; Create New Theme Fonts is in) | 8–14 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Action Settings, Print, Insert Object) | 8–14 |
-| Missing dialogs (Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 6–12 |
-| Missing dialogs (Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 4–8 |
-| Missing dialogs (Font, Bullets and Numbering, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
-| Window chrome, system appearance, palette fixes (#41, #71, #79) | 3–5 |
-| Missing dialogs (Font, Bullets and Numbering, Find/Replace, Replace Fonts, Action Settings, Print, Insert Object) | 8–14 |
+| Missing dialogs (Print, Insert Object and the rest of PowerPoint's ~60) | 4–8 |
 | Window chrome and system appearance (#41, #71) | 3–5 |
-| Grid Options, edit points UI, crop depth | 4–7 |
 | Arrange All (New Window is one extra window) | 2–3 |
 | Edit points UI, crop depth | 3–6 |
 | Multiple windows | 3–5 |
 | A screenshot comparison pass on the most-used tabs | 2–4 |
-| **Total** | **~29–51** |
+| **Total** | **~26–46** |
 
 ## Revision history
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-14 | minor | Community PR wave folded: one row each for Format Shape, Dialogs (41, listed from `dialogs.rs`), Animation Pane (timeline is in), window, Quick Access Toolbar, Format Background, rulers, image paste, context menus, exact size and edit points; estimates re-totalled (~26–46 h) |
 | 2026-10-13 | trivial | Eyedropper in the colour menus (#367) |
 | 2026-10-12 | minor | Title bar: an Export button next to Save opens the Export dialog, a quick-access shortcut beside File › Export |
 | 2026-10-12 | minor | A right click selects the shape under the pointer before its context menu opens, as in PowerPoint; edited text keeps its selection and gets text items |

From b1ca1230e65c140a7fdda82f9a23f058b0cad030 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 16:15:17 -0400
Subject: [PATCH 374/376] Engine: text.delete and text.move are registered once
 (the newer docs win); a test keeps command ids unique

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/cmd/text.rs | 2 --
 crates/engine/src/tests.rs    | 7 +++++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/crates/engine/src/cmd/text.rs b/crates/engine/src/cmd/text.rs
index 8cb05ca3..9c6d88e1 100644
--- a/crates/engine/src/cmd/text.rs
+++ b/crates/engine/src/cmd/text.rs
@@ -36,7 +36,6 @@ pub fn specs() -> Vec<CommandSpec> {
             autocorrect_options
         ),
         cmd!("text.insert", "Type Text", [], None, "{text} (\\n = new paragraph, \\u000b = line break)", has_text, insert),
-        cmd!("text.delete", "Delete Text", [], Some("Backspace"), "{dir?: backward|forward|wordBackward|wordForward}", has_text, delete),
         // The input method's composition: shown in place, an undo step only once committed.
         CommandSpec {
             id: "text.compose",
@@ -58,7 +57,6 @@ pub fn specs() -> Vec<CommandSpec> {
             has_text,
             commit
         ),
-        cmd!(noundo "text.move", "Move Insertion Point", [], None, "{to: left|right|up|down|wordLeft|wordRight|lineStart|lineEnd|paraStart|paraEnd|start|end, extend?: bool}", has_text, move_caret),
         cmd!(
             "text.delete",
             "Delete Text",
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 926a8fd1..9644bf6f 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -3454,3 +3454,10 @@ fn background_loads_are_adopted_through_a_command() {
     assert!(s.execute("file.adopt", &json!({})).is_err());
     std::fs::remove_file(&path).ok();
 }
+
+#[test]
+fn every_command_id_is_registered_once() {
+    let mut seen = std::collections::HashSet::new();
+    let dups: Vec<&str> = crate::command_specs().iter().map(|c| c.id).filter(|id| !seen.insert(*id)).collect();
+    assert!(dups.is_empty(), "registered more than once: {dups:?}");
+}

From c79416be4c5a07dc859eaf3271d9e455fa7430d5 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 16:24:26 -0400
Subject: [PATCH 375/376] Fix up merged PRs: no debug_assert in
 blank_presentation; more exhaustion coverage

blank_presentation's debug_assert would panic in debug builds (never-crash
rule): a fresh deck that cannot fit its title slide now simply arrives
without it. The exhaustion test also covers insert.smartArt and
insert.textBox.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/engine/src/tests.rs   | 2 ++
 crates/model/src/defaults.rs | 6 +++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 1a6238ee..08028f84 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -3469,6 +3469,8 @@ fn an_exhausted_id_space_refuses_growth() {
     assert!(s.execute("shape.insert", &json!({"preset": "rect", "rect": [10, 10, 100, 50]})).is_err());
     assert!(s.execute("slide.duplicate", &json!({})).is_err());
     assert!(s.execute("edit.duplicate", &json!({})).is_err());
+    assert!(s.execute("insert.smartArt", &json!({"kind": "blockList", "items": ["Plan", "Build"]})).is_err());
+    assert!(s.execute("insert.textBox", &json!({"text": "Hi"})).is_err());
     // What the deck holds is untouched: same slides, same ids, no duplicates.
     let after = s.doc().unwrap().doc.clone();
     assert_eq!(after.slides.len(), before.slides.len());
diff --git a/crates/model/src/defaults.rs b/crates/model/src/defaults.rs
index 3645f332..19adc7bb 100644
--- a/crates/model/src/defaults.rs
+++ b/crates/model/src/defaults.rs
@@ -522,9 +522,9 @@ pub fn blank_presentation(size: Size, theme: Theme, title_slide: bool) -> Presen
         // A fresh deck starts at id 256 and this builds a handful of ids, so the slide always
         // fits; should that ever stop holding, the deck arrives without its title slide rather
         // than with a duplicated id.
-        let s = new_slide(&mut p, first_layout);
-        debug_assert!(s.is_some(), "a fresh deck cannot run out of ids");
-        p.slides.extend(s.map(|s| vec![Arc::new(s)]).unwrap_or_default());
+        if let Some(s) = new_slide(&mut p, first_layout) {
+            p.slides.push(Arc::new(s));
+        }
     }
     p
 }

From ea904591a59d01c9af75c2e7ef5730227da3e3a3 Mon Sep 17 00:00:00 2001
From: Brandon Thomas <echelon@gmail.com>
Date: Wed, 14 Oct 2026 16:33:37 -0400
Subject: [PATCH 376/376] Fix flaky test: the missing-Recent test waits for the
 background open (#291 after #488)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 crates/ui-egui/src/lib.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index e1f29e7d..f020f5f5 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -2809,6 +2809,15 @@ mod tests {
         // drawn message is a second node that mentions the name (the OS text after it varies).
         harness.get_by_label("missing.deckcraft").click();
         harness.run_steps(2);
+        // The file is read in the background (#350): wait for that read to finish.
+        for _ in 0..500 {
+            if harness.state().opening.is_none() {
+                break;
+            }
+            std::thread::sleep(std::time::Duration::from_millis(10));
+            harness.run_steps(1);
+        }
+        harness.run_steps(2);
         assert!(harness.state().toast.is_some(), "the open error was raised");
         assert!(harness.get_all_by_label_contains("missing.deckcraft").count() >= 2, "the open error is drawn on the page, next to the entry");
     }