toDataURL.jpeg.quality.basic.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.quality.basic.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.quality.basic</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.quality.basic</h1>

<p class="desc">toDataURL with JPEG uses the quality parameter</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.quality.basic.png" class="output expected" id="expected" alt="">

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

<script>

var t = async_test("toDataURL with JPEG uses the quality parameter");

_addTest(function(canvas, ctx) {

ctx.fillStyle = '#00f';

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

ctx.fillStyle = '#0ff';

ctx.fillRect(0, 3, 100, 1);

// Check for JPEG support first

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

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

  _assert(true, "true");

} else {

  var data_hi = canvas.toDataURL('image/jpeg', 0.99);

  var data_lo = canvas.toDataURL('image/jpeg', 0.01);

  ctx.fillStyle = '#f00';

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

  deferTest();

  var img_hi = new Image();

  img_hi.onload = function ()

      var img_lo = new Image();

      img_lo.onload = t.step_func_done(function ()

          ctx.drawImage(img_hi, 0, 0, 50, 50, 0, 0, 50, 50);

          ctx.drawImage(img_lo, 0, 0, 50, 50, 50, 0, 50, 50);

          _assert(data_hi.length > data_lo.length, "data_hi.length > data_lo.length");

          _assertPixelApprox(canvas, 25,25, 0,0,255,255, 8);

          _assertPixelApprox(canvas, 75,25, 0,0,255,255, 32);

});

      img_lo.src = data_lo;

};

  img_hi.src = data_hi;

});

</script>