1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/image/test/mochitest/test_drawDiscardedImage.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,85 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<!--
1.7 +https://bugzilla.mozilla.org/show_bug.cgi?id=731419
1.8 +-->
1.9 +<head>
1.10 + <title>Test for Bug 731419 - Draw an ostensibly discarded image to a canvas</title>
1.11 + <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.12 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
1.13 +</head>
1.14 +
1.15 +<body>
1.16 +
1.17 +<!--
1.18 + Load an image in an iframe, then draw that image to a canvas. Then set the
1.19 + iframe to display:none (after bug 731419, this causes the image's decoded
1.20 + data to be discarded) and draw the image to a canvas again. We should draw
1.21 + the same image data both times.
1.22 +-->
1.23 +
1.24 +<script>
1.25 +
1.26 +SimpleTest.waitForExplicitFinish();
1.27 +
1.28 +var data1;
1.29 +
1.30 +function drawImage()
1.31 +{
1.32 + var canvas = document.getElementById('canvas');
1.33 + var ctx = canvas.getContext('2d');
1.34 + var iframeDoc = document.getElementById('iframe').contentDocument;
1.35 +
1.36 + ctx.clearRect(0, 0, canvas.height, canvas.width);
1.37 + ctx.drawImage(iframeDoc.getElementById('image'), 0, 0);
1.38 + return canvas.toDataURL();
1.39 +}
1.40 +
1.41 +function iframeLoad()
1.42 +{
1.43 + data1 = drawImage();
1.44 + document.getElementById('iframe').style.display = 'none';
1.45 +
1.46 + // Spin the event loop a few times to give the image in the display:none
1.47 + // iframe a chance to be discarded.
1.48 + SimpleTest.executeSoon(function() {
1.49 + SimpleTest.executeSoon(function() {
1.50 + SimpleTest.executeSoon(function() {
1.51 + step2();
1.52 + });
1.53 + });
1.54 + });
1.55 +}
1.56 +
1.57 +function step2()
1.58 +{
1.59 + is(drawImage(), data1, "Same image before and after iframe display:none");
1.60 + SimpleTest.finish();
1.61 +}
1.62 +
1.63 +</script>
1.64 +
1.65 +<canvas id='canvas'></canvas>
1.66 +
1.67 +<iframe id='iframe' onload='iframeLoad()' src='data:text/html,<img id="image"
1.68 +src="data:image/png;base64,
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1.84 +RfHGYhTfvRfF48BdYB3YAPgfnOuE39kFlREAAAAASUVORK5CYII=">'></iframe>
1.85 +
1.86 +</body>
1.87 +</html>
1.88 +
