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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=469170
-->
<head>
<title>Test for Bug 469170</title>
<script type="application/javascript" 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"
src="data:text/html,%3Chtml%3E%3C%2Fhtml%3E"></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>
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