2d.composite.uncovered.image.source-out.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/compositing/2d.composite.uncovered.image.source-out.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>OffscreenCanvas test: 2d.composite.uncovered.image.source-out</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.composite.uncovered.image.source-out</h1>

<p class="desc">drawImage() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.</p>

<script>

promise_test(async t => {

  var canvas = new OffscreenCanvas(100, 50);

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

  ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';

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

  ctx.globalCompositeOperation = 'source-out';

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

  const blob = await response.blob();

  const bitmap = await createImageBitmap(blob);

  ctx.drawImage(bitmap, 40, 40, 10, 10, 40, 50, 10, 10);

  _assertPixelApprox(canvas, 50,25, 0,0,0,0, 5);

}, "drawImage() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.");

</script>