2d.composite.globalAlpha.imagepattern.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/compositing/2d.composite.globalAlpha.imagepattern.html - WPT Dashboard Interop Dashboard

<!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.globalAlpha.imagepattern</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.globalAlpha.imagepattern</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="/images/green-100x50.png" class="output expected" id="expected" alt="">

<ul id="d"></ul>

<script>

promise_test(async t => {

  var canvas = document.getElementById('c');

  var ctx = canvas.getContext('2d');

  ctx.fillStyle = '#0f0';

  ctx.fillRect(0, 0, 100, 50);

  const response = await fetch('/images/red.png');

  const blob = await response.blob();

  const bitmap = await createImageBitmap(blob);

  ctx.fillStyle = ctx.createPattern(bitmap, 'no-repeat');

  // Avoiding any potential alpha = 0 optimisations.

  ctx.globalAlpha = 0.01;

  ctx.fillRect(0, 0, 100, 50);

  _assertPixelApprox(canvas, 50,25, 2,253,0,255, 2);

}, "");

</script>