<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=841579
-->
<head>
  <title>Test for Bug 841579</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="/tests/SimpleTest/WindowSnapshot.js"></script>
  <script type="application/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=841579">Mozilla Bug 841579</a>
<p id="display"></p>
<div id="content">
</div>
<pre id="test">
<script type="application/javascript">
/** Test for Bug 841579**/

SimpleTest.requestFlakyTimeout("Early failure timeout");
SimpleTest.waitForExplicitFinish();

const FAILURE_TIMEOUT = 120000; // Fail early after 120 seconds (2 minutes)

const Cc = SpecialPowers.Cc;
const Ci = SpecialPowers.Ci;
const gContent = document.getElementById("content");

var gImg;
var gMyDecoderObserver;
var gIsTestFinished = false;
var gFiles;
var gNotifications = 0;
var gLoads = 0;
var gRemovals = 0;
var gExpected = 5;

function* fileToLoad() {
  yield "red.png";
  yield "invalid.jpg";
  yield "lime100x100.svg";
  yield "bad.jpg";
  yield "rillybad.jpg";
}

function onSizeAvailable(aRequest) {
  ok(true, "AfterLoad.onSizeAvailable called for " + gImg.src);
}
function onLoadComplete(aRequest) {
  ok(gExpected > gLoads, "AfterLoad.onLoadComplete called for " + gImg.src);
  gLoads++;

  // We aren't going to get a decode complete event if the metadata decoding
  // failed (i.e. for invalid.jpg). By definition we should have the size or
  // an error once we get a load complete event, so check if the size is valid
  // and if not, trigger a decode complete event manually.
  var hasSize = false;
  try {
    hasSize = aRequest.image.width > 0 && aRequest.image.height > 0;
  } catch(e) {}

  if (hasSize) {
    maybeAdvance();
  } else {
    onDecodeComplete(aRequest);
  }
}

function onDecodeComplete(aRequest) {
  ok(gExpected > gRemovals, "AfterLoad.onDecodeComplete called for " + gImg.src);
  SimpleTest.executeSoon(function() {
    try {
      gContent.removeChild(gImg);
    } 
    catch (e) {} 
    gRemovals++;
    maybeAdvance();
  });
}

function failTest() {
  ok(false, "timing out after " + FAILURE_TIMEOUT + "ms.  " +
            "currently displaying " + gImg.src);
  cleanUpAndFinish();
}

function onNotification()
{
  ok(gExpected > gNotifications, "AfterLoad.onNotification called for " + gImg.src);
  gNotifications++;
  maybeAdvance();
}

function maybeAdvance()
{
  if (gNotifications != gLoads || gNotifications != gRemovals) {
    return;
  }

  let {done, value} = gFiles.next();
  if (done) {
    cleanUpAndFinish();
    return;
  }
  gImg.src = value;
  gContent.appendChild(gImg);
}

function cleanUpAndFinish() {
  // On the off chance that failTest and myOnStopFrame are triggered
  // back-to-back, use a flag to prevent multiple calls to SimpleTest.finish.
  if (gIsTestFinished) {
    return;
  }
  let imgLoadingContent = SpecialPowers.wrap(gImg);
  imgLoadingContent.removeObserver(gMyDecoderObserver);
  // TODO - this isn't the case until post-bug 716140's refactorings
  // ok(gNotifications == gLoads, "Should be notified the same number of times as loads");
  SimpleTest.finish();
  gIsTestFinished = true;
}

function main() {
  gFiles = fileToLoad();
  gImg = new Image();
  gImg.onload = onNotification;
  gImg.onerror = onNotification;

  // Create, customize & attach decoder observer
  var observer = new ImageDecoderObserverStub();
  observer.sizeAvailable = onSizeAvailable;
  observer.loadComplete = onLoadComplete;
  observer.decodeComplete = onDecodeComplete;
  gMyDecoderObserver =
    Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools)
      .createScriptedObserver(SpecialPowers.wrapCallbackObject(observer));
  let imgLoadingContent = SpecialPowers.wrap(gImg);
  imgLoadingContent.addObserver(gMyDecoderObserver);

  // We want to test the cold loading behavior, so clear cache in case an
  // earlier test got our image in there already.
  clearAllImageCaches();

  // kick off image-loading! myOnStopFrame handles the rest.
  gImg.setAttribute("src", gFiles.next().value);
  gContent.appendChild(gImg);

  // In case something goes wrong, fail earlier than mochitest timeout,
  // and with more information.
  setTimeout(failTest, FAILURE_TIMEOUT);
}

window.onload = main;

</script>
</pre>
</body>
</html>
