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test(render): the non-separable blend modes keep their colour over an empty page too (#2970)

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Hue, Saturation, Color and Luminosity blended with the white paper the
same way; the fix covers them, and the test now checks them over an
empty part of the page.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RUNQSPVXx3dDBabRZHAnjz
This commit is contained in:
mtlcl410
2026-10-19 15:39:51 +08:00
co-authored by Claude Opus 5.5
parent 8836088551
commit 771129594c
1 changed files with 17 additions and 9 deletions
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crates/render/src/raster.rs
+17 -9
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@@ -6047,14 +6047,20 @@ trailer << /Root 1 0 R >>
fn blend_modes_over_an_empty_part_of_the_page_keep_their_colour() {
let px = |p: &RenderedPage, x: u32, y: u32| p.rgba[((y * p.width + x) * 4) as usize..][..4].to_vec();
for (mode, over_red) in [
("Normal", [0, 255, 0]),
("Multiply", [0, 0, 0]),
("Screen", [255, 255, 0]),
("Lighten", [255, 255, 0]),
("Difference", [255, 255, 0]),
("Exclusion", [255, 255, 0]),
("ColorDodge", [255, 0, 0]),
("Overlay", [255, 0, 0]),
("Normal", Some([0, 255, 0])),
("Multiply", Some([0, 0, 0])),
("Screen", Some([255, 255, 0])),
("Lighten", Some([255, 255, 0])),
("Difference", Some([255, 255, 0])),
("Exclusion", Some([255, 255, 0])),
("ColorDodge", Some([255, 0, 0])),
("Overlay", Some([255, 0, 0])),
// The non-separable modes mix hue, saturation and luminosity; over an empty part of
// the page they too must keep the source colour.
("Hue", None),
("Saturation", None),
("Color", None),
("Luminosity", None),
] {
let content = "1 0 0 rg 20 20 150 150 re f /G1 gs 0 1 0 rg 100 50 150 120 re f";
let pdf = format!(
@@ -6081,7 +6087,9 @@ trailer << /Root 1 0 R >>
assert!(p.error.is_none(), "{mode}: {:?}", p.error);
// Pixel rows run top down: PDF (210, 100) and (130, 100) are rows 100 from the top.
assert_eq!(px(&p, 210, 100), vec![0, 255, 0, 255], "{mode} over the empty page");
assert_eq!(px(&p, 130, 100)[..3], over_red, "{mode} over the red square");
if let Some(over_red) = over_red {
assert_eq!(px(&p, 130, 100)[..3], over_red, "{mode} over the red square");
}
assert_eq!(px(&p, 280, 10), vec![255, 255, 255, 255], "{mode}: the paper stays white");
}
}