test_bug478398.html

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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>