test_bug469170.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=469170

-->

<head>

  <title>Test for Bug 469170</title>

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

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body onload="runTest();">

<p><a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=469170">Mozilla Bug 469170</a></p>

<iframe id="source" width="50" height="50" srcdoc="<html></html>"></iframe>

<pre id="test">

<script type="application/javascript">

/** Test for Bug 469170 **/

SimpleTest.waitForExplicitFinish();

function runTest() {

  var source = document.getElementById('source').contentWindow;

  rect = { left: 0, top: 0,

           width: source.innerWidth, height: source.innerHeight };

  var canvas = SpecialPowers.snapshotRect(source, rect, "transparent");

  var context = canvas.getContext("2d");

  var components = [ "red", "green", "blue", "alpha" ];

  var data = context.getImageData(0, 0, canvas.width, canvas.height).data;

  var failed = false;

  for (var i = 0; i < data.length; i++) {

    if (data[i] != 0) {

      is(data[i], 0, "pixel " + Math.floor(i/4) + " " + components[i%4]);

      failed = true;

  if (!failed) {

    ok(!failed, "all pixels fully transparent");

  SimpleTest.finish();

</script>

</pre>

</body>

</html>