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M4.59: pattern strokes and freeform gradients keep their look in PDF

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Pattern strokes are written as the pattern's tiles clipped to the stroke's
outline (dashes, caps, profile, arrowheads and alignment included) instead
of mid-grey; freeform gradients on fills, strokes and type as an image of
their colour field at the document raster effects resolution, clipped to
what they paint, instead of their average colour. Both read back within
2% of the canvas at 150 ppi with no warning. Text strokes are covered for
cap, miter limit, dash array and alignment; knockout groups keep their
soft-masked form with a warning. The freeform box and grid sampling are
shared with the renderer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
bflatastic
2026-10-05 11:52:35 +07:00
co-authored by Claude Opus 5.5
parent e967c31be6
commit ffc60d5ff8
11 changed files with 354 additions and 40 deletions
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crates/engine/src/cmd/fileio/pdf.rs
+1 -1
View File
@@ -62,7 +62,7 @@ pub fn specs() -> Vec<CommandSpec> {
"PDF Settings",
[],
None,
"{preset?, includeDocument?: false, …document.exportPdf options} → {settings (the preset with the options applied), presets: [name…], changed: [{option: \"compression.compressText\", value}] (what differs from the preset), warnings}; includeDocument also exports the active document in memory and adds its warnings (pattern strokes, effects left out…)",
"{preset?, includeDocument?: false, …document.exportPdf options} → {settings (the preset with the options applied), presets: [name…], changed: [{option: \"compression.compressText\", value}] (what differs from the preset), warnings}; includeDocument also exports the active document in memory and adds its warnings (knockout groups approximated, effects left out…)",
always,
pdf_settings
),
crates/engine/src/cmd/fileio/tests_pdf.rs
+9 -4
View File
@@ -107,16 +107,21 @@ fn options_not_applied_yet_and_document_features_warn() {
let w = warnings(&export(&mut s, json!({"thumbnails": true, "marks": {"trim": true}})));
assert_eq!(w.len(), 2, "{w:?}");
assert!(w.iter().any(|w| w.contains("thumbnails")) && w.iter().any(|w| w.contains("marks")));
// A pattern stroke is approximated: its warning comes back from every PDF path.
// A pattern stroke is written as its tiles clipped to the stroke: nothing to report.
let tile = s.execute("shape.rectangle", &json!({"x": 0, "y": 0, "width": 10, "height": 10})).unwrap()["id"].as_u64().unwrap();
s.execute("select.set", &json!({"ids": [tile]})).unwrap();
s.execute("object.pattern.make", &json!({"name": "Dots", "width": 20, "height": 20})).unwrap();
s.execute("object.pattern.done", &json!({})).unwrap();
let frame = s.execute("shape.rectangle", &json!({"x": 20, "y": 20, "width": 50, "height": 40})).unwrap()["id"].as_u64().unwrap();
s.execute("paint.setStroke", &json!({"ids": [frame], "swatch": "Dots"})).unwrap();
let pattern = |w: Vec<String>| w.iter().any(|w| w.contains("pattern strokes"));
assert!(pattern(warnings(&export(&mut s, json!({})))));
assert!(pattern(warnings(&s.execute("document.export", &as_export(&json!({}))).unwrap())));
assert_eq!(warnings(&export(&mut s, json!({}))).len(), 0);
// A knockout group is approximated: its warning comes back from every PDF path.
s.execute("select.set", &json!({"ids": [frame]})).unwrap();
s.execute("object.group", &json!({})).unwrap();
s.execute("transparency.set", &json!({"knockout": "on"})).unwrap();
let knockout = |w: Vec<String>| w.iter().any(|w| w.contains("knockout groups"));
assert!(knockout(warnings(&export(&mut s, json!({})))));
assert!(knockout(warnings(&s.execute("document.export", &as_export(&json!({}))).unwrap())));
// Other formats have none.
assert!(warnings(&s.execute("document.export", &json!({"format": "png"})).unwrap()).is_empty());
}