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Fix #319: exports warn when type in a missing font is written in the fallback font

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Opening a PDF whose fonts aren't installed keeps the text live in the fallback font (as
Illustrator substitutes and highlights missing fonts), and opening said so, but every export
then wrote the fallback font silently ("warnings": []), so a headless convert re-set the type
without a word.

- Exports that draw type now say so in their warnings, naming the missing families and the
  fallback font: PDF (outlined or real text, also .ai and Save As), EPS, EMF/WMF, raster images
  and SVG with outlined or embedded fonts. Live SVG text, DXF, text and native files name the
  font itself and don't warn. Replacing the font (Find Font) clears it.
- The fonts a document uses (text.fonts' scope, Package's font list) come from one helper.
- textAs: outlines already keeps the glyphs the PDF draws (its embedded font program, installed
  or not): now covered by a test with an embedded serif font that isn't installed, checked
  against the installed font's and the fallback's outlines.
- docs/mcp.md and ROADMAP describe the warning.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-08 06:04:29 +07:00
co-authored by Claude Opus 5.5
parent ab62b5f8e8
commit 4b6c3d1e2c
9 changed files with 169 additions and 36 deletions
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crates/engine/src/cmd/fileio/encode.rs
+16 -2
View File
@@ -355,7 +355,8 @@ 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; the other formats have none).
/// features approximated or left out; every format that draws type: fonts written in the fallback
/// font).
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)
@@ -364,6 +365,19 @@ pub fn encode_with_warnings(doc: &Document, format: &str, p: &Value) -> Result<(
/// [`encode`], with every file the export writes.
pub fn encode_all(doc: &Document, format: &str, p: &Value) -> Result<Encoded> {
let f = super::writable(C, Some(format), None)?;
let mut enc = encode_files(doc, f, p)?;
// Formats that draw type: missing fonts come out in the fallback font (PDF and SVG say so
// themselves: SVG only when it outlines or embeds fonts).
if (f.raster || matches!(f.id, "eps" | "emf" | "wmf"))
&& let Some(w) = crate::cmd::fonts::substitution_warning(doc)
{
enc.warnings.push(w);
}
Ok(enc)
}
/// [`encode_all`] without the font substitution warning.
fn encode_files(doc: &Document, f: &Format, p: &Value) -> Result<Encoded> {
let doc = &*doc.without_edit_modes();
let n = doc.artboards.len();
// SVG reads its own `useArtboards` (an SVG option).
@@ -374,7 +388,7 @@ pub fn encode_all(doc: &Document, format: &str, p: &Value) -> Result<Encoded> {
if let Some(o) = q.as_object_mut() {
o.remove("useArtboards");
}
return encode_all(&single_artboard(doc, bounds, "Art"), f.id, &q);
return encode_files(&single_artboard(doc, bounds, "Art"), f, &q);
}
let bytes = match f.id {
"vectorcraft" => super::native::encode(C, f, doc, p)?,