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Merge pull request #5182 from dotCooCoo/fix/pdf-spot-gradient-white-process-stop

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PDF export: a white stop linked to a process swatch keeps a spot gradient on its ink
This commit is contained in:
Brandon Thomas
2026-11-01 23:45:21 -05:00
committed by GitHub
parent ff3b00e832 589c56da22
commit 01d371b744
3 changed files with 46 additions and 12 deletions
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crates/engine/src/tests/linked_stops.rs
+29
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@@ -140,6 +140,35 @@ fn spot_gradients_export_as_separation_shadings() {
assert!(warnings.iter().any(|w| w.contains("spot")), "{warnings:?}");
}
#[test]
fn white_stops_linked_to_process_swatches_are_paper_in_spot_gradients() {
let (mut s, _) = setup();
run(&mut s, "swatch.new", json!({"name": "Paper", "color": "#ffffff", "global": true}));
let ink_to_paper = json!({"stops": [{"offset": 0, "swatch": "Ink", "tint": 80}, {"offset": 1, "swatch": "Paper"}]});
// As Ink → unlinked white: a Separation shading from 80 % to 0 %.
run(&mut s, "paint.editGradient", ink_to_paper.clone());
let (pdf, warnings) = pdf_of(&s);
assert!(pdf.contains("/ShadingType 2") && pdf.contains("/Separation/Ink/DeviceCMYK"), "a Separation shading");
assert!(!pdf.contains("/DeviceN") && pdf.contains("/C0[0.8]/C1[0]"), "the shading's tints");
assert!(!warnings.iter().any(|w| w.contains("spot")), "{warnings:?}");
// A Perceptual one too.
run(&mut s, "paint.editGradient", with(ink_to_paper, json!({"method": "perceptual"})));
let (pdf, _) = pdf_of(&s);
assert!(!pdf.contains("/Subtype/Image") && !pdf.contains("/DeviceN") && pdf.contains("/Separation/Ink/DeviceCMYK"), "Perceptual");
// With process yellow, the linked white stop adds no ink: Yellow and Ink only.
let yellow = json!({"c": 0, "m": 0, "y": 0.6, "k": 0});
let three =
json!({"stops": [{"offset": 0, "swatch": "Ink"}, {"offset": 0.5, "swatch": "Paper"}, {"offset": 1, "color": yellow}], "method": "classic"});
run(&mut s, "paint.editGradient", three);
let (pdf, _) = pdf_of(&s);
assert!(pdf.contains("/DeviceN[/Yellow/Ink]/DeviceCMYK") && pdf.contains("/C0[0 1]/C1[0 0]"), "Yellow and Ink");
// A white spot ink is an ink, not paper: a DeviceN shading of both spot inks.
run(&mut s, "swatch.new", json!({"name": "Opaque", "color": "#ffffff", "spot": true}));
run(&mut s, "paint.editGradient", json!({"stops": [{"offset": 0, "swatch": "Ink"}, {"offset": 1, "swatch": "Opaque"}]}));
let (pdf, _) = pdf_of(&s);
assert!(pdf.contains("/DeviceN[/Ink/Opaque]/DeviceCMYK"), "a white spot ink keeps its plate");
}
#[test]
fn spot_gradients_mixed_with_other_inks_export_as_device_n_shadings() {
let (mut s, _) = setup();