test_drawImageIncomplete.html

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<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=517056

-->

<head>

  <title>Test for Bug 517056</title>

  <script src="/tests/SimpleTest/SimpleTest.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=517056">Mozilla Bug 517056</a>

<p id="display">

  <canvas id="c" width="1" height="1"></canvas>

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<div id="content" style="display: none">

</div>

<pre id="test">

<script type="application/javascript">

/** Test for Bug 517056 **/

var ctx = $("c").getContext('2d');

ctx.fillStyle = "black";

ctx.fillRect(0, 0, 1, 1);

var data = ctx.getImageData(0, 0, 1, 1).data;

is(data[0], 0, "Red channel of black should be 0");

is(data[1], 0, "Green channel of black should be 0");

is(data[2], 0, "Blue channel of black should be 0")

is(data[3], 255, "Alpha channel of black should be opaque");

var img = new Image();

// Force a new URI every time, so that we don't run into stupid caching issues.

img.src = "image_green-1x1.png?" + (new Date + 0) + Math.random();

// This shouldn't throw

ctx.drawImage(img, 0, 0);

var data = ctx.getImageData(0, 0, 1, 1).data;

is(data[0], 0, "Red channel of black should be 0 and image should have been ignored");

is(data[1], 0, "Green channel of black should be 0 and image should have been ignored");

is(data[2], 0, "Blue channel of black should be 0 and image should have been ignored")

is(data[3], 255, "Alpha channel of black should be opaque and image should have been ignored");

SimpleTest.waitForExplicitFinish();

img.onload = function() {

  ctx.drawImage(img, 0, 0);

  var loadData = ctx.getImageData(0, 0, 1, 1).data;

  is(loadData[0], 0, "Red channel of green should be 0");

  is(loadData[1], 255, "Green channel of green should be 255");

  is(loadData[2], 0, "Blue channel of green should be 0")

  is(loadData[3], 255, "Alpha channel of green should be opaque");

  SimpleTest.finish();

</script>

</pre>

</body>

</html>