2d.layer.unclosed-nested.w.html

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<!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.unclosed-nested-expected.html">

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

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

<p class="desc">Check that layers are rendered even if not closed.</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) {

    const canvas = new OffscreenCanvas(200, 200);

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

    // `transferToImageBitmap` is used to transfer the test result to the

    // worker's parent, but `transferToImageBitmap` can't be called on canvas

    // with unclosed layers. We can however draw to a separate offscreen canvas

    // and write it to the main canvas using `drawImage`.

    const canvas2 = new OffscreenCanvas(200, 200);

    const ctx2 = canvas2.getContext('2d');

    ctx2.fillStyle = 'rgba(0, 0, 255, 1)';

    ctx2.fillRect(60, 60, 75, 50);

    ctx2.globalAlpha = 0.5;

    ctx2.beginLayer();

    ctx2.fillStyle = 'rgba(225, 0, 0, 1)';

    ctx2.fillRect(50, 50, 75, 50);

    ctx2.beginLayer();

    ctx2.fillStyle = 'rgba(0, 255, 0, 1)';

    ctx2.fillRect(70, 70, 75, 50);

    ctx2.endLayer();

    // Missing ctx2.endLayer() here.

    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>