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https://bugzilla.mozilla.org/show_bug.cgi?id=628888
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<title>Test for Bug 628888 - Animations in external document sometimes don't run</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=628888">Mozilla Bug 628888</a>
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<pre id="test">
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<![CDATA[
/* Test for Bug 628888 - Animations in external document sometimes don't run
*
* This bug concerns a condition where an external document is loaded after the
* page show event is dispatched, leaving the external document paused.
*
* To reproduce the bug we attach an external document with animation after the
* page show event has fired.
*
* However, it is difficult to test if the animation is playing or not since we
* don't receive events from animations running in an external document.
*
* Our approach is to simply render the result to a canvas (which requires
* elevated privileges and that is why we are using a MochiTest rather
* than a reftest) and poll one of the pixels to see if it changes colour.
*
* This should mean the test succeeds quickly but fails slowly.
*/
const POLL_INTERVAL = 100; // ms
const POLL_TIMEOUT = 10000; // ms
var accumulatedWaitTime = 0;
function pageShow()
{
var content = document.getElementById("content");
content.style.filter = "url(smilExtDoc_helper.svg#filter)";
window.setTimeout(checkResult, 0);
}
function checkResult()
{
var content = document.getElementById("content");
var bbox = content.getBoundingClientRect();
var canvas = SpecialPowers.snapshotRect(window, bbox);
var ctx = canvas.getContext("2d");
var imgd = ctx.getImageData(bbox.width/2, bbox.height/2, 1, 1);
var isGreen = (imgd.data[0] == 0) &&
(imgd.data[1] == 255) &&
(imgd.data[2] == 0);
if (isGreen) {
ok(true, "Filter is animated as expected");
} else if (accumulatedWaitTime >= POLL_TIMEOUT) {
ok(false, "No animation detected after waiting " + POLL_TIMEOUT + "ms");
} else {
accumulatedWaitTime += POLL_INTERVAL;
window.setTimeout(checkResult, POLL_INTERVAL);
return;
}
// Hide our content since mochitests normally try to be visually "quiet"
content.style.display = 'none';
SimpleTest.finish();
}
window.addEventListener('pageshow', pageShow, false);
SimpleTest.waitForExplicitFinish();
SimpleTest.requestFlakyTimeout("untriaged");
]]>
</script>
</pre>
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