test_bug389366.html

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https://bugzilla.mozilla.org/show_bug.cgi?id=389366

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  <title>Test for Bug 389366</title>

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

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

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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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<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>

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<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 = 0.502;

  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 = ctx1.createImageData(10, 10);

  var rgba = [ 255, 0, 0, 128 ];

  for (i = 0; i < 50; ++i) {

    for (j = 0; j < 4; ++j) {

      imgData.data[(i * 4) + j] = rgba[j];

  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>

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