content/canvas/test/test_2d.imageData.put.unchanged.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.imageData.put.unchanged</title>
   3 <!-- Testing: putImageData(getImageData(...), ...) has no effect -->
   4 <script src="/MochiKit/MochiKit.js"></script>
   5 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   7 <body>
   8 <canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
   9 <script>
  10
  11 SimpleTest.waitForExplicitFinish();
  12 MochiKit.DOM.addLoadEvent(function () {
  13
  14 var canvas = document.getElementById('c');
  15 var ctx = canvas.getContext('2d');
  16
  17 var i = 0;
  18 for (var y = 0; y < 16; ++y) {
  19     for (var x = 0; x < 16; ++x, ++i) {
  20         ctx.fillStyle = 'rgba(' + i + ',' + (Math.floor(i*1.5) % 256) + ',' + (Math.floor(i*23.3) % 256) + ',' + (i/256) + ')';
  21         ctx.fillRect(x, y, 1, 1);
  22     }
  23 }
  24 var imgdata1 = ctx.getImageData(0.1, 0.2, 15.8, 15.9);
  25 var olddata = [];
  26 for (var i = 0; i < imgdata1.data.length; ++i)
  27     olddata[i] = imgdata1.data[i];
  28
  29 ctx.putImageData(imgdata1, 0.1, 0.2);
  30
  31 var imgdata2 = ctx.getImageData(0.1, 0.2, 15.8, 15.9);
  32 for (var i = 0; i < imgdata2.data.length; ++i) {
  33     ok(olddata[i] === imgdata2.data[i], "olddata[\""+(i)+"\"] === imgdata2.data[\""+(i)+"\"]");
  34 }
  35
  36 SimpleTest.finish();
  37
  38 });
  39 </script>
  40