toDataURL.jpeg.alpha.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-canvas-element/toDataURL.jpeg.alpha.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

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

<title>Canvas test: toDataURL.jpeg.alpha</title>

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

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

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

<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">

<body class="show_output">

<h1>toDataURL.jpeg.alpha</h1>

<p class="desc">toDataURL with JPEG composites onto black</p>

<p class="output">Actual output:</p>

<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>

<p class="output expectedtext">Expected output:<p><img src="toDataURL.jpeg.alpha.png" class="output expected" id="expected" alt="">

<ul id="d"></ul>

<script>

var t = async_test("toDataURL with JPEG composites onto black");

_addTest(function(canvas, ctx) {

ctx.fillStyle = 'rgba(128, 255, 128, 0.5)';

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

ctx.globalCompositeOperation = 'destination-over'; // should be ignored by toDataURL

var data = canvas.toDataURL('image/jpeg');

ctx.globalCompositeOperation = 'source-over';

if (!data.match(/^data:image\/jpeg[;,]/)) {

  _assert(true, "true");

} else {

  ctx.fillStyle = '#f00';

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

  var img = new Image();

  deferTest();

  img.onload = t.step_func_done(function ()

      ctx.drawImage(img, 0, 0);

      _assertPixelApprox(canvas, 50,25, 63,127,63,255, 8);

});

  img.src = data;

});

</script>