2d.layer.nested.w.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/layers/2d.layer.nested.w.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">

<html class="reftest-wait">

<link rel="match" href="2d.layer.nested-expected.html">

<script src="/common/reftest-wait.js"></script>

<title>Canvas test: 2d.layer.nested</title>

<h1>2d.layer.nested</h1>

<p class="desc">Tests nested canvas layers.</p>

<canvas id="canvas" width="200" height="200">

  <p class="fallback">FAIL (fallback content)</p>

</canvas>

<script id='myWorker' type='text/worker'>

  self.onmessage = function(e) {

    try {

      const canvas = new OffscreenCanvas(200, 200);

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

      var circle = new Path2D();

      circle.arc(90, 90, 40, 0, 2 * Math.PI);

      ctx.fill(circle);

      ctx.globalCompositeOperation = 'source-in';

      ctx.beginLayer();

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

      ctx.fillRect(60, 60, 75, 50);

      ctx.globalAlpha = 0.5;

      ctx.beginLayer();

      ctx.fillStyle = 'rgba(225, 0, 0, 1)';

      ctx.fillRect(50, 50, 75, 50);

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

      ctx.fillRect(70, 70, 75, 50);

      ctx.endLayer();

      ctx.endLayer();

      const bitmap = canvas.transferToImageBitmap();

      self.postMessage({ type: 'bitmap', bitmap }, [bitmap]);

    } catch (error) {

      self.postMessage({ type: 'error', message: error });

};

</script>

<script>

  const blob = new Blob([document.getElementById('myWorker').textContent]);

  const worker = new Worker(URL.createObjectURL(blob));

  worker.onerror = failOnError;

  worker.onmessage = reftestStep(msg => {

    if (msg.data.type === 'error') {

      failOnError(msg.data.message);

      return;

    const outputCtx = document.getElementById("canvas").getContext('2d');

    outputCtx.drawImage(msg.data.bitmap, 0, 0);

    takeScreenshot();

});

  worker.postMessage(null);

</script>

</html>