Logging: escape control characters and mark continuation lines in log records

apps/deckcraft/src/logging.rs

@@ -148,7 +148,19 @@ pub fn rotate(dir: &Path) -> std::io::Result<(PathBuf, File)> {
 /// One formatted log line: `<timestamp> <LEVEL> [<thread>] <target>: <message>\n`.
 pub fn format_line(ts: &str, level: log::Level, thread: &str, target: &str, message: &str) -> String {
     let message = message.strip_suffix('\n').unwrap_or(message);
-    format!("{ts} {level:<5} [{thread}] {target}: {message}\n")
+    // Messages can embed document-controlled text (a part name, a relationship id): control
+    // characters other than tab are escaped and each continuation line is marked, so such text
+    // cannot start a line that looks like a record of its own.
+    let mut text = String::with_capacity(message.len());
+    for c in message.chars() {
+        match c {
+            '\n' => text.push_str("\n    | "),
+            '\t' => text.push(c),
+            c if c.is_control() => text.extend(c.escape_default()),
+            c => text.push(c),
+        }
+    }
+    format!("{ts} {level:<5} [{thread}] {target}: {text}\n")
 }
 
 /// Where formatted lines go besides standard error: kept in memory until a file is attached,
@@ -446,8 +458,13 @@ mod tests {
             ),
             "2026-10-08T07:59:17.728Z WARN  [main] deckcraft_pptx::opc: pptx: skipping oversized part ppt/media/image1.png\n"
         );
-        // A multi-line message keeps its lines; the record still ends in exactly one newline.
-        assert!(format_line("t", log::Level::Error, "w", "x", "a\nb\n").ends_with("x: a\nb\n"));
+        // A multi-line message keeps its lines, each continuation marked; the record still ends in
+        // exactly one newline.
+        assert!(format_line("t", log::Level::Error, "w", "x", "a\nb\n").ends_with("x: a\n    | b\n"));
+        // Injected line breaks and escape sequences cannot forge a record.
+        let line = format_line("t", log::Level::Warn, "w", "x", "part a\r\n2026 ERROR [m] y: forged\x1b[2J");
+        assert_eq!(line.matches('\n').count(), 2);
+        assert!(!line.contains('\r') && !line.contains('\x1b'));
     }
 
     #[test]

crates/render/src/bevel.rs

@@ -125,9 +125,7 @@ pub fn draw(ctx: &mut RenderContext, bevel: &Bevel, fill: Option<Rgba>, path: &B
     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, 2048), ((bounds.height() * s).ceil() as u32).clamp(1, 2048));
-    // Each pixel tests every edge, so a dense outline is simplified to the raster's edge budget.
-    let pixel = (bounds.width() / f64::from(pw)).min(bounds.height() / f64::from(ph));
-    let polys = crate::pathgrad::simplify(crate::pathgrad::polygons(path), pixel, crate::pathgrad::edge_budget(pw, ph));
+    let polys = crate::pathgrad::polygons(path);
     if polys.is_empty() {
         return;
     }

crates/render/src/colr.rs

@@ -11,8 +11,6 @@ use vello_cpu::{RenderContext, peniko};
 
 /// Nesting depth of clips and layers past which a glyph opens no more (hostile fonts).
 const MAX_DEPTH: usize = 64;
-/// Fills and gradient stops one colour glyph may paint; the rest of a hostile glyph is skipped.
-const MAX_WORK: usize = 100_000;
 
 /// Paint `gid` of `face` as a colour glyph, its origin mapped by `at` (y down, points) at `scale`
 /// points per font unit. `fg` is the text colour (palette index 0xFFFF) and `alpha` fades it all.
@@ -28,7 +26,7 @@ pub fn paint(ctx: &mut RenderContext, face: &FontFace, gid: u32, at: Affine, sca
         .unwrap_or_default();
     // Font units are y up; the slide is y down.
     let base = at * Affine::scale(scale) * Affine::scale_non_uniform(1.0, -1.0);
-    let mut p = Painter { ctx, face, base, stack: vec![Affine::IDENTITY], palette, fg, opened: Vec::new(), work: 0 };
+    let mut p = Painter { ctx, face, base, stack: vec![Affine::IDENTITY], palette, fg, opened: Vec::new() };
     p.ctx.push_layer(None, None, Some(alpha.clamp(0.0, 1.0) as f32), None, None);
     let ok = glyph.paint(face.location(), &mut p).is_ok();
     // A malformed glyph may leave layers open: close them all.
@@ -52,8 +50,6 @@ struct Painter<'a> {
     /// Clips and composite groups pushed by the glyph, innermost last: true when a layer was
     /// opened on the context for it (false past `MAX_DEPTH`, so its pop is skipped too).
     opened: Vec<bool>,
-    /// Fills plus gradient stops painted so far, against [`MAX_WORK`].
-    work: usize,
 }
 
 fn affine(t: &Transform) -> Affine {
@@ -178,16 +174,6 @@ impl ColorPainter for Painter<'_> {
     }
 
     fn fill(&mut self, brush: Brush<'_>) {
-        let stops = match &brush {
-            Brush::Solid { .. } => 0,
-            Brush::LinearGradient { color_stops, .. } | Brush::RadialGradient { color_stops, .. } | Brush::SweepGradient { color_stops, .. } => {
-                color_stops.len()
-            }
-        };
-        self.work = self.work.saturating_add(1 + stops);
-        if self.work > MAX_WORK {
-            return;
-        }
         match brush {
             Brush::Solid { palette_index, alpha } => {
                 let c = self.color(palette_index, alpha);

crates/render/src/pathgrad.rs

@@ -25,16 +25,6 @@ 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;
 
-/// Most points `polygons` keeps from one path; a path flattening past this (a huge finite curve) is
-/// not drawn rather than held in memory first.
-const MAX_POINTS: usize = 2_000_000;
-
-/// The edge budget for a `pw` x `ph` raster where each pixel tests every edge.
-pub(crate) fn edge_budget(pw: u32, ph: u32) -> usize {
-    let pixels = u64::from(pw).saturating_mul(u64::from(ph)).max(1);
-    usize::try_from(MAX_EDGE_WORK / pixels).unwrap_or(usize::MAX).max(MIN_POLY_EDGES)
-}
-
 /// 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`.
@@ -124,31 +114,21 @@ fn shape_position(outline: &[Vec<Point>], c: Point, p: Point) -> f64 {
 pub fn polygons(path: &BezPath) -> Vec<Vec<Point>> {
     let mut out: Vec<Vec<Point>> = Vec::new();
     let mut cur: Vec<Point> = Vec::new();
-    let mut total = 0usize;
-    kurbo::flatten(path.iter(), 0.25, |el| {
-        total += 1;
-        if total > MAX_POINTS {
-            return;
-        }
-        match el {
-            PathEl::MoveTo(p) => {
-                if cur.len() > 1 {
-                    out.push(std::mem::take(&mut cur));
-                }
-                cur = vec![p];
+    kurbo::flatten(path.iter(), 0.25, |el| match el {
+        PathEl::MoveTo(p) => {
+            if cur.len() > 1 {
+                out.push(std::mem::take(&mut cur));
             }
-            PathEl::LineTo(p) => cur.push(p),
-            PathEl::ClosePath => {
-                if let Some(f) = cur.first().copied() {
-                    cur.push(f);
-                }
-            }
-            _ => {}
+            cur = vec![p];
         }
+        PathEl::LineTo(p) => cur.push(p),
+        PathEl::ClosePath => {
+            if let Some(f) = cur.first().copied() {
+                cur.push(f);
+            }
+        }
+        _ => {}
     });
-    if total > MAX_POINTS {
-        return Vec::new();
-    }
     if cur.len() > 1 {
         out.push(cur);
     }
@@ -166,7 +146,7 @@ pub fn polygons(path: &BezPath) -> Vec<Vec<Point>> {
 /// `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.
-pub(crate) fn simplify(outline: Vec<Vec<Point>>, tol: f64, max_edges: usize) -> Vec<Vec<Point>> {
+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;
@@ -253,17 +233,13 @@ pub fn fill(ctx: &mut RenderContext, kind: &str, focus: [f64; 4], stops: &[(f64,
     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" {
-        let max_edges = edge_budget(pw, ph);
+        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()
     };
-    // An outline `polygons` refused (too many points) has no contours: skip the shape rather than
-    // paint it with the rectangle fallback's different gradient.
-    if kind == "shape" && outline.is_empty() {
-        return;
-    }
     let lut = ramp(stops);
     let a = alpha.clamp(0.0, 1.0);
     let mut data = Vec::with_capacity((pw * ph) as usize);
@@ -396,20 +372,6 @@ mod tests {
         assert!(t.elapsed() < std::time::Duration::from_secs(20), "{:?}", t.elapsed());
     }
 
-    #[test]
-    fn a_shape_gradient_with_no_usable_outline_paints_nothing() {
-        // One polygon over the per-polygon cap is dropped by `polygons`.
-        let path = many_segment_square(26_000);
-        assert!(polygons(&path).is_empty());
-        let mut ctx = RenderContext::new(64, 64);
-        let stops = [(0.0, Rgba::rgb(0, 0, 0)), (1.0, Rgba::rgb(255, 255, 255))];
-        fill(&mut ctx, "shape", CENTRE, &stops, Rect::new(0.0, 0.0, 64.0, 64.0), &path, Affine::IDENTITY, 1.0);
-        ctx.flush();
-        let mut px = vec![0u8; 64 * 64 * 4];
-        ctx.render(vello_cpu::PixmapMut::new(64, 64, &mut px).unwrap(), &mut vello_cpu::Resources::new());
-        assert!(px.chunks(4).all(|p| p[3] == 0), "nothing was painted");
-    }
-
     #[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))];