author Ian Gilman <>
Tue, 27 Jul 2010 16:20:14 -0700
changeset 50214 9517ed327dd417cd58f06fc693364679f5488579
parent 47352 88283dc6c2f19685a3ae513e5525f2d39f2f7e88
child 74315 1188456710819d4606e74396be333ead9fe63261
permissions -rw-r--r--
+ merge (forgot to rebase)

  <title>Test for Bug 399925</title>
  <script type="text/javascript" src="/MochiKit/packed.js"></script>
  <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" />
<a target="_blank" href="">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>  
<pre id="test">
<script class="testbody" type="text/javascript">

/** Test for Bug 399925. **/
var pngResults = new Array();
var oldTimeoutPref;
var oldDiscardPref;
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";

  // draw the canvas once

  // 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");

function allDone()
    is(pngResults[0], pngResults[1], "got different rendered results");
    setImagePref(DISCARD_TIMEOUT_PREF, oldTimeoutPref);
    setImagePref(DISCARD_ENABLED_PREF, oldDiscardPref);