Export: PDF, EPS, SVG, EMF, WMF and image exports warn about type that doesn't fit its frame

Print and Print Preview name the area type and type on a path that
prints without the text past the end of its frame (#2308). The exports
that draw type gave no such warning: a PDF, EPS, SVG, EMF, WMF or
raster export of a frame too small for its text answered with no
warning about it.

These exports now add the same warning, with "isn't drawn in the
export" in place of "doesn't print". Each export counts the visible
objects that it draws. Those are the objects on the pages or artboards
it writes, or all of them in an EPS of the visible art and in an SVG
without chosen artboards. A PDF leaves out layers that don't print
unless includeNonPrinting or createLayers is set. The objects are found
with the walk that fonts::printed_type runs for Print, and typecmd.rs
builds the message with the code that builds Print's. A .ai file keeps
the whole text in its editing data and gives no warning.

Docs: docs/mcp.md (Fitting area type), docs/target-app-parity.md.

crates/engine/src/cmd/fileio/encode.rs

@@ -385,7 +385,7 @@ pub fn encode(doc: &Document, format: &str, p: &Value) -> Result<Vec<u8>> {
 
 /// Like [`encode`], also returning the encoder's warnings (PDF and SVG: options not applied yet,
 /// features approximated or left out; every format that draws type: fonts written in the fallback
-/// font).
+/// font; PDF, EPS, SVG, EMF, WMF and the raster formats: type that doesn't fit its frame).
 pub fn encode_with_warnings(doc: &Document, format: &str, p: &Value) -> Result<(Vec<u8>, Vec<String>)> {
     let f = super::writable(C, Some(format), None)?;
     encode_all(doc, f.id, p)?.single(f)
@@ -529,6 +529,8 @@ fn encode_files(doc: &Document, f: &Format, p: &Value) -> Result<Encoded> {
             if enc.files.is_empty() {
                 return Err(bad(C, "the document has no artboard"));
             }
+            let regions: Vec<Rect> = enc.files.iter().filter_map(|(b, _)| b.and_then(|b| doc.artboards.get(b))).map(|a| a.rect).collect();
+            enc.warnings.extend(crate::cmd::fonts::export_overflow_warning(doc, &doc.layers, Some(&regions)));
             if format == RasterFormat::WebP && o.lossless == Some(false) {
                 enc.warnings.push("lossy WebP isn't available yet: the file is lossless (exact, but larger)".into());
             }

crates/engine/src/cmd/fileio/eps.rs

@@ -270,6 +270,7 @@ pub(super) fn encode(doc: &Document, p: &Value) -> Result<Encoded> {
     if pages.is_empty() {
         return Err(bad(C, "the document has no artboard"));
     }
+    let regions: Vec<Rect> = pages.iter().map(|(_, region, _)| *region).collect();
     let transparent = doc.layers.iter().any(|l| l.shows_transparency());
     let flat = flatten_document(doc, &set.flatten)?;
     let drawn = flat.as_ref().unwrap_or(doc);
@@ -302,6 +303,7 @@ pub(super) fn encode(doc: &Document, p: &Value) -> Result<Encoded> {
             }
         }
     }
+    enc.warnings.extend(crate::cmd::fonts::export_overflow_warning(doc, &doc.layers, Some(&regions)));
     Ok(enc)
 }
 

crates/engine/src/cmd/fileio/metafile.rs

@@ -42,6 +42,8 @@ pub(super) fn encode(doc: &Document, p: &Value, use_artboards: Option<bool>, kin
     if enc.files.is_empty() {
         return Err(bad(C, "the document has no artboard"));
     }
+    let regions: Vec<vectorcraft_geom::Rect> = enc.files.iter().filter_map(|(b, _)| b.and_then(|b| doc.artboards.get(b))).map(|a| a.rect).collect();
+    enc.warnings.extend(crate::cmd::fonts::export_overflow_warning(doc, &doc.layers, Some(&regions)));
     Ok(enc)
 }
 

crates/engine/src/cmd/fileio/pdf.rs

@@ -254,9 +254,21 @@ pub fn encode(cmd: &str, doc: &Document, p: &Value) -> Result<(Vec<u8>, Vec<Stri
     let (full, mut warnings) = crate::cmd::place::document::full_documents(doc);
     let (bytes, drawn_warnings) = encode_carrying(cmd, &full, p, || Ok(vectorcraft_format::save(doc, false)))?;
     warnings.extend(drawn_warnings);
+    warnings.extend(overflow_warning(cmd, &full, p)?);
     Ok((bytes, warnings))
 }
 
+/// The warning about the type that the pages of a PDF of `doc` with the options in `p` draw and
+/// whose text doesn't fit (see [`crate::cmd::fonts::export_overflow_warning`]): on the pages
+/// chosen, leaving out the layers that don't print unless the PDF writes them.
+fn overflow_warning(cmd: &str, doc: &Document, p: &Value) -> Result<Option<String>> {
+    let opts = options(cmd, doc, p)?;
+    let areas = vectorcraft_pdf::page_areas(doc, &opts).map_err(|e| pdf_error(cmd, e))?;
+    let set = &opts.settings;
+    let printed = if set.include_non_printing || set.create_layers { None } else { without_non_printing(&doc.layers) };
+    Ok(crate::cmd::fonts::export_overflow_warning(doc, printed.as_deref().unwrap_or(&doc.layers), Some(&areas)))
+}
+
 /// [`encode`] the pages of `doc`, carrying `native()` as the editing data (a `.ai` file: the
 /// native document with its save options, whose pages may be left blank).
 pub(super) fn encode_carrying(cmd: &str, doc: &Document, p: &Value, native: impl FnOnce() -> Result<Vec<u8>>) -> Result<(Vec<u8>, Vec<String>)> {

crates/engine/src/cmd/fileio/svg.rs

@@ -157,6 +157,10 @@ pub(super) fn encode(doc: &Document, p: &Value, compressed: bool) -> Result<Enco
     // that preparation out of the native attachment so missing links remain relinkable.
     let (full, warnings) = crate::cmd::place::document::full_documents(doc);
     let doc = &*full;
+    // A chosen artboard's file holds the art over it; otherwise the file holds all of it.
+    let regions: Option<Vec<vectorcraft_geom::Rect>> =
+        chosen.then(|| boards.iter().flatten().filter_map(|b| doc.artboards.get(*b)).map(|a| a.rect).collect());
+    let overflow = crate::cmd::fonts::export_overflow_warning(doc, &doc.layers, regions.as_deref());
     // SVG has no filters for the Photoshop-style effects: their objects go in as images.
     let flat = crate::cmd::rasterfx::flatten_pixel_effects(doc);
     let doc = flat.as_ref().unwrap_or(doc);
@@ -184,5 +188,6 @@ pub(super) fn encode(doc: &Document, p: &Value, compressed: bool) -> Result<Enco
     {
         enc.warnings.push(w);
     }
+    enc.warnings.extend(overflow);
     Ok(enc)
 }

crates/engine/src/cmd/fonts.rs

@@ -136,6 +136,19 @@ pub(super) fn printed_type(d: &Document, layers: &[Arc<Node>], areas: &[Rect]) -
     (walk.fonts, walk.overflow)
 }
 
+/// The warning of an export that draws `layers` of `d` over `areas` (document space; `None`: the
+/// whole of them) about the area type and type on a path that it draws and whose text doesn't fit,
+/// found as [`printed_type`] finds them for Print: visible objects of the document that aren't on
+/// a template layer.
+pub(super) fn export_overflow_warning(d: &Document, layers: &[Arc<Node>], areas: Option<&[Rect]>) -> Option<String> {
+    let mut walk = Printed { d, own: true, fonts: BTreeSet::new(), overflow: BTreeSet::new(), symbols: BTreeSet::new(), patterns: BTreeSet::new() };
+    for l in layers {
+        walk.node(l, areas);
+    }
+    let overflow: Vec<NodeId> = walk.overflow.into_iter().collect();
+    super::typecmd::export_overflow_warning(&overflow)
+}
+
 /// The walk of [`printed_type`].
 struct Printed<'a> {
     d: &'a Document,

crates/engine/src/cmd/typecmd.rs

@@ -315,6 +315,17 @@ pub(crate) fn with_bounds(s: &Session, id: Option<NodeId>, mut result: Value) ->
 /// (as [`with_overflow`] finds it): the text past the end of their frames doesn't print. It names
 /// the first 20 ids and counts the rest; `None` when `ids` is empty.
 pub(crate) fn overflow_warning(ids: &[NodeId]) -> Option<String> {
+    overflow_note(ids, "doesn't print")
+}
+
+/// [`overflow_warning`] as an export that draws type gives it: the text past the end of the frames
+/// isn't drawn in the export.
+pub(crate) fn export_overflow_warning(ids: &[NodeId]) -> Option<String> {
+    overflow_note(ids, "isn't drawn in the export")
+}
+
+/// [`overflow_warning`], saying that the text past the end of the frames `left_out`.
+fn overflow_note(ids: &[NodeId], left_out: &str) -> Option<String> {
     const NAMED: usize = 20;
     let (named, rest) = ids.split_at(ids.len().min(NAMED));
     let mut list = named.iter().map(|i| i.0.to_string()).collect::<Vec<_>>().join(", ");
@@ -323,8 +334,8 @@ pub(crate) fn overflow_warning(ids: &[NodeId]) -> Option<String> {
     }
     match ids {
         [] => None,
-        [_] => Some(format!("1 text object doesn't fit its frame: the text past the end of the frame doesn't print (id {list})")),
-        _ => Some(format!("{} text objects don't fit their frames: the text past the end of each frame doesn't print (ids {list})", ids.len())),
+        [_] => Some(format!("1 text object doesn't fit its frame: the text past the end of the frame {left_out} (id {list})")),
+        _ => Some(format!("{} text objects don't fit their frames: the text past the end of each frame {left_out} (ids {list})", ids.len())),
     }
 }