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LibWeb: Account for paint style and global alpha when drawing shadows

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This commit is contained in:
Tim Ledbetter
2025-10-21 10:09:46 +01:00
committed by Jelle Raaijmakers
parent 553a7a9278
commit b99c0c6a7f
Notes: github-actions[bot] 2025-10-21 16:57:04 +00:00 
Author: https://github.com/tcl3
Commit: https://github.com/LadybirdBrowser/ladybird/commit/b99c0c6a7f2
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6530
Reviewed-by: https://github.com/gmta ✅
15 changed files with 216 additions and 2 deletions
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33
Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.1.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.shadow.alpha.1</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.shadow.alpha.1</h1>
<p class="desc">Shadow color alpha components are used</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="../../../../images/green-100x50.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("Shadow color alpha components are used");
_addTest(function(canvas, ctx) {
ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 100, 50);
ctx.shadowColor = 'rgba(255, 0, 0, 0.01)';
ctx.shadowOffsetY = 50;
ctx.fillRect(0, -50, 100, 50);
_assertPixelApprox(canvas, 50,25, 0,255,0,255, 4);
});
</script>

33
Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.2.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.shadow.alpha.2</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.shadow.alpha.2</h1>
<p class="desc">Shadow color alpha components are used</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.shadow.alpha.2.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("Shadow color alpha components are used");
_addTest(function(canvas, ctx) {
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50);
ctx.shadowColor = 'rgba(0, 0, 255, 0.5)';
ctx.shadowOffsetY = 50;
ctx.fillRect(0, -50, 100, 50);
_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
});
</script>

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Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.2.png Normal file
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Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.3.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.shadow.alpha.3</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.shadow.alpha.3</h1>
<p class="desc">Shadows are affected by globalAlpha</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.shadow.alpha.3.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("Shadows are affected by globalAlpha");
_addTest(function(canvas, ctx) {
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50);
ctx.fillStyle = '#f00'; // (work around broken Firefox globalAlpha caching)
ctx.shadowColor = '#00f';
ctx.shadowOffsetY = 50;
ctx.globalAlpha = 0.5;
ctx.fillRect(0, -50, 100, 50);
_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
});
</script>

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Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.3.png Normal file
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Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.4.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.shadow.alpha.4</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.shadow.alpha.4</h1>
<p class="desc">Shadows with alpha components are correctly affected by globalAlpha</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.shadow.alpha.4.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("Shadows with alpha components are correctly affected by globalAlpha");
_addTest(function(canvas, ctx) {
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50);
ctx.fillStyle = '#f00'; // (work around broken Firefox globalAlpha caching)
ctx.shadowColor = 'rgba(0, 0, 255, 0.707)';
ctx.shadowOffsetY = 50;
ctx.globalAlpha = 0.707;
ctx.fillRect(0, -50, 100, 50);
_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
});
</script>

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Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.4.png Normal file
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Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.5.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.shadow.alpha.5</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.shadow.alpha.5</h1>
<p class="desc">Shadows of shapes with alpha components are drawn correctly</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.shadow.alpha.5.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("Shadows of shapes with alpha components are drawn correctly");
_addTest(function(canvas, ctx) {
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 50);
ctx.fillStyle = 'rgba(64, 0, 0, 0.5)';
ctx.shadowColor = '#00f';
ctx.shadowOffsetY = 50;
ctx.fillRect(0, -50, 100, 50);
_assertPixelApprox(canvas, 50,25, 127,0,127,255, 2);
});
</script>

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Tests/LibWeb/Text/input/wpt-import/html/canvas/element/shadows/2d.shadow.alpha.5.png Normal file
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