content/canvas/test/test_2d.imageData.get.clamp.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.imageData.get.clamp</title>
   3 <!-- Testing: getImageData() clamps colours to the range [0, 255] -->
   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 ctx.fillStyle = 'rgb(-100, -200, -300)';
  18 ctx.fillRect(0, 0, 100, 50);
  19 ctx.fillStyle = 'rgb(256, 300, 400)';
  20 ctx.fillRect(20, 10, 60, 10);
  21 var imgdata1 = ctx.getImageData(10, 5, 1, 1);
  22 ok(imgdata1.data[0] === 0, "imgdata1.data[\""+(0)+"\"] === 0");
  23 ok(imgdata1.data[1] === 0, "imgdata1.data[\""+(1)+"\"] === 0");
  24 ok(imgdata1.data[2] === 0, "imgdata1.data[\""+(2)+"\"] === 0");
  25 var imgdata2 = ctx.getImageData(30, 15, 1, 1);
  26 ok(imgdata2.data[0] === 255, "imgdata2.data[\""+(0)+"\"] === 255");
  27 ok(imgdata2.data[1] === 255, "imgdata2.data[\""+(1)+"\"] === 255");
  28 ok(imgdata2.data[2] === 255, "imgdata2.data[\""+(2)+"\"] === 255");
  29
  30 SimpleTest.finish();
  31
  32 });
  33 </script>
  34