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path: root/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.global-states.filter.alpha.html
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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<link rel="match" href="2d.layer.global-states.filter.alpha-expected.html">
<meta name=fuzzy content="maxDifference=0-2; totalPixels=0-6766">
<title>Canvas test: 2d.layer.global-states.filter.alpha</title>
<h1>2d.layer.global-states.filter.alpha</h1>
<p class="desc">Checks that layers with filters correctly use global render states.</p>
<canvas id="canvas" width="200" height="200">
  <p class="fallback">FAIL (fallback content)</p>
</canvas>
<script>
  const canvas = new OffscreenCanvas(200, 200);
  const ctx = canvas.getContext('2d');

  ctx.fillStyle = 'rgba(0, 0, 255, 1)';

  var circle = new Path2D();
  circle.arc(90, 90, 45, 0, 2 * Math.PI);
  ctx.fill(circle);

  ctx.globalAlpha = 0.6;

  ctx.beginLayer({filter: [
      {name: 'colorMatrix', values: [0.393, 0.769, 0.189, 0, 0,
                                     0.349, 0.686, 0.168, 0, 0,
                                     0.272, 0.534, 0.131, 0, 0,
                                     0, 0, 0, 1, 0]},
      {name: 'componentTransfer',
          funcA: {type: "table", tableValues: [0, 0.7]}},
      {name: 'dropShadow', dx: 5, dy: 5, floodColor: '#81e'}]});

  ctx.fillStyle = 'rgba(200, 0, 0, 1)';
  ctx.fillRect(50, 50, 75, 50);
  ctx.fillStyle = 'rgba(0, 200, 0, 1)';
  ctx.fillRect(70, 70, 75, 50);

  ctx.endLayer();

  const outputCanvas = document.getElementById("canvas");
  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
</script>