gecko-dev/image/test/mochitest/test_bug399925.html

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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=399925
-->
<head>
<title>Test for Bug 399925</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="imgutils.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=399925">Mozilla Bug 399925</a>
<p id="display"></p>
<div id="content" style="display: none">
<img src="bug399925.gif" id="gif" />
<canvas id="canvas" width="100" height="100"> </canvas>
</div>
<pre id="test">
<script class="testbody" type="text/javascript">
/** Test for Bug 399925. **/
var pngResults = new Array();
var oldTimeoutPref;
var oldDiscardPref;
SimpleTest.waitForExplicitFinish();
window.onload = runTest;
function runTest()
{
// Get the old discard timeout
oldTimeoutPref = getImagePref(DISCARD_TIMEOUT_PREF);
// We're testing discarding here, so we should make sure it's flipped on
oldDiscardPref = getImagePref(DISCARD_ENABLED_PREF);
// Enable Discarding
setImagePref(DISCARD_ENABLED_PREF, true);
// Sets the discard timer to 500ms so we don't have to wait so long. The
// actual time is nondeterministic, but is bounded by 2 * timer = 1 second.
setImagePref(DISCARD_TIMEOUT_PREF, 1000);
// Create the image _after_ setting the discard timer pref
var image = new Image();
image.setAttribute("id", "gif");
image.src = "bug399925.gif";
document.getElementById("content").appendChild(image);
// draw the canvas once
drawCanvas();
// Set the timeout to draw it after discard
setTimeout('drawCanvas(); allDone();', 3000);
}
function drawCanvas()
{
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var gif = document.getElementById('gif');
context.drawImage(gif, 0, 0);
ok(true, "we got through the drawImage call without an exception being thrown");
pngResults.push(canvas.toDataURL);
}
function allDone()
{
is(pngResults[0], pngResults[1], "got different rendered results");
setImagePref(DISCARD_TIMEOUT_PREF, oldTimeoutPref);
setImagePref(DISCARD_ENABLED_PREF, oldDiscardPref);
SimpleTest.finish();
}
</script>
</pre>
</body>
</html>