test_bug902651.html

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<!DOCTYPE HTML>

<title>Canvas test: canvas demotion</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

<body>

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

<script>

SimpleTest.waitForExplicitFinish();

SimpleTest.requestFlakyTimeout("untriaged");

addLoadEvent(function () {

var canvas = document.getElementById('c');

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

ctx.fillStyle = 'rgb(50, 50, 50)';

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

ctx.translate(25, 25);

SpecialPowers.wrap(ctx).demote();

setTimeout(function() {

  ctx.fillStyle = 'rgb(127, 127, 127)';

  ctx.fillRect(0, 0, 10, 10);

  var pixels = ctx.getImageData(0, 0, 1, 1);

  ok(pixels.data[0] === 50, "pixels.data[0] expected 50, got " + pixels.data[0]);

  ok(pixels.data[1] === 50, "pixels.data[1] expected 50, got " + pixels.data[1]);

  ok(pixels.data[2] === 50, "pixels.data[2] expected 50, got " + pixels.data[2]);

  pixels = ctx.getImageData(25, 25, 1, 1);

  ok(pixels.data[0] === 127, "pixels.data[0] expected 127, got " + pixels.data[0]);

  ok(pixels.data[1] === 127, "pixels.data[1] expected 127, got " + pixels.data[1]);

  ok(pixels.data[2] === 127, "pixels.data[2] expected 127, got " + pixels.data[2]);

  SimpleTest.finish();

}, 50);

});

</script>