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LibWeb/Canvas: Support globalCompositionOperation

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Canvas now supports compositing and various blending modes via the
`globalCompositeOperation` attribute.
This commit is contained in:
Glenn Skrzypczak 2025-01-28 18:19:30 +01:00 • committed by Sam Atkins
commit 8575bddfe6
Notes: github-actions[bot] 2025-02-05 11:28:07 +00:00
16 changed files with 283 additions and 32 deletions
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32
Tests/LibWeb/Text/input/wpt-import/html/canvas/element/compositing/2d.composite.transparent.lighter.html Normal file
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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<meta charset="UTF-8">
<title>Canvas test: 2d.composite.transparent.lighter</title>
<script src="../../../../resources/testharness.js"></script>
<script src="../../../../resources/testharnessreport.js"></script>
<script src="../../../../html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="../../../../html/canvas/resources/canvas-tests.css">
<body class="show_output">
<h1>2d.composite.transparent.lighter</h1>
<p class="desc"></p>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<p class="output expectedtext">Expected output:<p><img src="2d.composite.transparent.lighter.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("");
_addTest(function(canvas, ctx) {
ctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
ctx.fillRect(0, 0, 100, 50);
ctx.globalCompositeOperation = 'lighter';
ctx.fillStyle = 'rgba(0, 0, 255, 0.75)';
ctx.fillRect(0, 0, 100, 50);
_assertPixelApprox(canvas, 50,25, 0,128,191,255, 5);
});
</script>

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Tests/LibWeb/Text/input/wpt-import/html/canvas/element/compositing/2d.composite.transparent.lighter.png Normal file
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