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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=478398
+-->
+<head>
+ <title>Test for Bug 478398</title>
+ <script 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=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(function() {
+ 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>
+</body>
+</html>
+