2d.layer.opaque-canvas.w.html

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/layers/2d.layer.opaque-canvas.w.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->

<html class="reftest-wait">

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

<title>Canvas test: 2d.layer.opaque-canvas</title>

<h1>2d.layer.opaque-canvas</h1>

<p class="desc">Checks that layer blending works inside opaque canvas</p>

<canvas id="canvas" width="300" height="300">

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

</canvas>

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

  self.onmessage = function(e) {

    const canvas = new OffscreenCanvas(300, 300);

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

    const canvas2 = new OffscreenCanvas(200, 200);

    const ctx2 = canvas2.getContext('2d', {alpha: false});

    ctx2.fillStyle = 'purple';

    ctx2.fillRect(10, 10, 100, 100);

    ctx2.beginLayer({filter: {name: 'dropShadow', dx: -10, dy: 10,

                              stdDeviation: 0,

                              floodColor: 'rgba(200, 100, 50, 0.5)'}});

    ctx2.fillStyle = 'green';

    ctx2.fillRect(50, 50, 100, 100);

    ctx2.globalAlpha = 0.8;

    ctx2.fillStyle = 'yellow';

    ctx2.fillRect(75, 25, 100, 100);

    ctx2.endLayer();

    ctx.fillStyle = 'blue';

    ctx.fillRect(0, 0, 300, 300);

    ctx.drawImage(canvas2, 0, 0);

    const bitmap = canvas.transferToImageBitmap();

    self.postMessage(bitmap, bitmap);

};

</script>

<script>

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

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

  worker.addEventListener('message', msg => {

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

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

    document.documentElement.classList.remove("reftest-wait");

});

  worker.postMessage(null);

</script>

</html>