Quelle test_drawImageIncomplete.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/canvas/test/test_drawImageIncomplete.html

<!DOCTYPE HTML>
<html>

<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>
</p>
<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>

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