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<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=478398
-->
<head>
<title>Test for Bug 478398</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" />
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<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=478398">Mozilla Bug 478398</a>
<pre id="test">
<script class="testbody" type="text/javascript">
/** Test for Bug 399925. **/
var oldTimeoutPref;
var oldDiscardPref;
SimpleTest.waitForExplicitFinish();
window.onload = stage1;
var imageFilename = "bug478398_ONLY.png";
function stage1()
{
// Get the current pref values
oldTimeoutPref = getImagePref(DISCARD_TIMEOUT_PREF);
oldDiscardPref = getImagePref(DISCARD_ENABLED_PREF);
// We're testing discarding here
setImagePref(DISCARD_ENABLED_PREF, true);
// Sets the discard timer to 500 ms (max timeout = 2*500ms = 1s)
setImagePref(DISCARD_TIMEOUT_PREF, 500);
// Create the image _after_ setting the discard timer pref
// This image was carefully constructed to make it a "big win" for discarding,
// so any reasonable heuristic should still discard it.
var image = new Image();
image.setAttribute("id", "testimage");
image.style.display = "none";
image.src = imageFilename;
// Put the image into the document
document.body.appendChild(image);
// Wait for load, then do stage2
image.onload = stage2;
}
function stage2()
{
// Make sure we're loaded
ok(isImageLoaded("testimage"), "image should be loaded");
// We're loaded - force a synchronous decode
forceDecode("testimage");
// We should be decoded
ok(isFrameDecoded("testimage"), "image should be decoded");
// Wait 1.5 seconds, then finish the test
setTimeout("finishTest();", 1500);
}
function finishTest()
{
// The image should be discarded by now
ok(!isFrameDecoded("testimage"), "image should have been discarded!");
// Reset the prefs
setImagePref(DISCARD_TIMEOUT_PREF, oldTimeoutPref);
setImagePref(DISCARD_ENABLED_PREF, oldDiscardPref);
// Finish the test
SimpleTest.finish();
}
</script>
</pre>
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