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Bug 389366 - Canvas's .getImageData is returning premultiplied alpha pixels. r=dolske on my mochitestification of the test he wrote but was too slackerly to convert to a Mochitest :-P

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jwalden@mit.edu 2007-10-29 14:30:45 -07:00
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Коммит 3ef62ea030
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1
dom/tests/mochitest/bugs/Makefile.in
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@ -56,6 +56,7 @@ _TEST_FILES = \
test_bug370098.html \
test_bug377539.html \
test_bug384122.html \
test_bug389366.html \
test_bug393974.html \
test_bug396843.html \
$(NULL)

95
dom/tests/mochitest/bugs/test_bug389366.html Normal file
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@ -0,0 +1,95 @@
<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=389366
-->
<head>
<title>Test for Bug 389366</title>
<script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
<script type="text/javascript" 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=389366">Mozilla Bug 389366</a>
<p id="display"></p>
<div id="content" style="display: none">
<h4>Canvas testcase</h4>
Canvas, with pixel set to #ff0000 at 50% opacity:<br>
<canvas id="canvas1" width="10" height="10"></canvas>
<br>
<canvas id="canvas2" width="10" height="10"></canvas>
</div>
<pre id="test">
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
function test()
{
// Draw to canvas1
var canvas1 = document.getElementById("canvas1");
var ctx1 = canvas1.getContext("2d");
ctx1.globalAlpha = 0.5;
ctx1.fillStyle = "#FF0000";
ctx1.fillRect(0, 0, 10, 10);
var data1 = ctx1.getImageData(0,0,1,1).data;
isDeeply(data1, [255, 0, 0, 128], "expected half-transparent red canvas 1");
// half-transparent red 10x10 square
var imgData = {
width : 10,
height : 10,
data : [
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128, 255, 0, 0, 128,
]
};
var canvas2 = document.getElementById("canvas2");
var ctx2 = canvas2.getContext("2d");
ctx2.putImageData(imgData, 0, 0);
var data2 = ctx2.getImageData(0,0,1,1).data;
isDeeply(data2, [255, 0, 0, 128], "expected half-transparent red canvas 2");
SimpleTest.finish();
}
addLoadEvent(test);
</script>
</pre>
</body>
</html>