2007-10-29 14:30:45 -07:00
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<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=389366
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-->
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<head>
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<title>Test for Bug 389366</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=389366">Mozilla Bug 389366</a>
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<p id="display"></p>
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<div id="content" style="display: none">
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<h4>Canvas testcase</h4>
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Canvas, with pixel set to #ff0000 at 50% opacity:<br>
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<canvas id="canvas1" width="10" height="10"></canvas>
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<br>
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<canvas id="canvas2" width="10" height="10"></canvas>
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</div>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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SimpleTest.waitForExplicitFinish();
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function test()
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{
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// Draw to canvas1
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var canvas1 = document.getElementById("canvas1");
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var ctx1 = canvas1.getContext("2d");
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2012-01-22 17:08:17 -08:00
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ctx1.globalAlpha = 0.502;
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2007-10-29 14:30:45 -07:00
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ctx1.fillStyle = "#FF0000";
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ctx1.fillRect(0, 0, 10, 10);
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var data1 = ctx1.getImageData(0,0,1,1).data;
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isDeeply(data1, [255, 0, 0, 128], "expected half-transparent red canvas 1");
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// half-transparent red 10x10 square
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2012-05-25 07:27:18 -07:00
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var imgData = ctx1.createImageData(10, 10);
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var rgba = [ 255, 0, 0, 128 ];
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for (i = 0; i < 50; ++i) {
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for (j = 0; j < 4; ++j) {
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imgData.data[(i * 4) + j] = rgba[j];
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}
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}
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2007-10-29 14:30:45 -07:00
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var canvas2 = document.getElementById("canvas2");
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var ctx2 = canvas2.getContext("2d");
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ctx2.putImageData(imgData, 0, 0);
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var data2 = ctx2.getImageData(0,0,1,1).data;
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isDeeply(data2, [255, 0, 0, 128], "expected half-transparent red canvas 2");
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SimpleTest.finish();
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}
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addLoadEvent(test);
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</script>
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</pre>
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</body>
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</html>
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