<!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>

