test_bug435296.html

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<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=435296

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<head>

  <title>Test for Bug 435296</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script type="application/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=435296">Mozilla Bug 435296</a>

<img id="testimage" style="display: none;">

<pre id="test">

<script type="application/javascript">

// Boilerplate

SimpleTest.waitForExplicitFinish();

// Assert that discarding isn't enabled, which might make this test go orange.

ok(!getImagePref(DISCARD_ENABLED_PREF), "discarding should NOT be enabled here");

// We want to make sure d-o-d is enabled, since that's what we're testing

var oldDODPref = getImagePref(DECODEONDRAW_ENABLED_PREF);

setImagePref(DECODEONDRAW_ENABLED_PREF, true);

// We're relying on very particular behavior for certain images - clear the

// image cache.

clearImageCache();

// In order to work around the effects introduced in bug 512435, we only load

// the image after window onload fires

function windowLoadHandler()

  // Set the source and an onload handler

  var image = document.getElementById("testimage");

  image.src = "schrep.png";

  image.onload = imageLoadHandler;

function imageLoadHandler()

  // The image is hidden, so it should not be decoded

  ok(!isFrameDecoded("testimage"), "image should not be decoded");

  // Make the image visible

  var image = document.getElementById("testimage");

  image.style.display = "inline";

  // Wait for the image to decode

  setTimeout(function() {

    tryToFinish();

  }, 500);

function tryToFinish()

  // If it hasn't happened yet, wait longer. If it never happens, this test

  // will timeout after 300 seconds...

  if (!isFrameDecoded("testimage")) {

    setTimeout(function() {

      tryToFinish();

    }, 500);

    return;

  // By definition, the image is decoded here. Give ourselves a pat on the back.

  ok(isFrameDecoded("testimage"), "image should be decoded");

  // Restore the decode-on-draw pref

  setImagePref(DECODEONDRAW_ENABLED_PREF, oldDODPref);

  // All done

  SimpleTest.finish();

// Set our onload handler, making sure we have focus

window.onload = SimpleTest.waitForFocus(windowLoadHandler);

</script>

</pre>

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