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LibGfx: Report premultiplied alpha type for opaque Skia surfaces

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We don't discern between opaque and non-opaque alpha types in LibGfx,
which at some point we might need to do. But for now, assume all opaque
Skia surfaces have premultiplied alpha.

Fixes #6892.
This commit is contained in:
Jelle Raaijmakers
2025-11-25 09:45:35 +01:00
committed by Jelle Raaijmakers
parent 6790a695da
commit 3b7eede694
Notes: github-actions[bot] 2025-11-26 08:26:02 +00:00 
Author: https://github.com/gmta
Commit: https://github.com/LadybirdBrowser/ladybird/commit/3b7eede694e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6928
4 changed files with 17 additions and 3 deletions
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11
Tests/LibWeb/Text/input/HTML/canvas-getImageData-no-alpha.html Normal file
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@@ -0,0 +1,11 @@
<!DOCTYPE html>
<script src="../include.js"></script>
<script>
test(() => {
const ctx = document.createElement("canvas").getContext("2d", {alpha: false});
ctx.fillStyle = "rgba(100, 150, 200, 0.5)";
ctx.fillRect(0, 0, 300, 150);
const color = ctx.getImageData(0, 0, 300, 150);
println(`${color.data[0]}, ${color.data[1]}, ${color.data[2]}, ${color.data[3]}`);
});
</script>