content/canvas/test/test_2d.drawImage.negativesource.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.drawImage.negativesource</title>
   3 <script src="/MochiKit/MochiKit.js"></script>
   4 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   5 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   6 <body>
   7 <canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
   8 <script>
   9 function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
  10     var pixel = ctx.getImageData(x, y, 1, 1);
  11     var pr = pixel.data[0],
  12         pg = pixel.data[1],
  13         pb = pixel.data[2],
  14         pa = pixel.data[3];
  15     ok(r-d <= pr && pr <= r+d &&
  16        g-d <= pg && pg <= g+d &&
  17        b-d <= pb && pb <= b+d &&
  18        a-d <= pa && pa <= a+d,
  19        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
  20 }
  21
  22 SimpleTest.waitForExplicitFinish();
  23 MochiKit.DOM.addLoadEvent(function () {
  24
  25 var canvas = document.getElementById('c');
  26 var ctx = canvas.getContext('2d');
  27
  28 var _thrown_outer = false;
  29 try {
  30
  31 ctx.fillStyle = '#f00';
  32 ctx.fillRect(0, 0, 100, 50);
  33 ctx.drawImage(document.getElementById('ggrr-256x256.png'), 100, 78, -100, 50, 0, 0, 50, 50);
  34 ctx.drawImage(document.getElementById('ggrr-256x256.png'), 100, 128, -100, -50, 50, 0, 50, 50);
  35 isPixel(ctx, 1,1, 0,255,0,255, "1,1", "0,255,0,255", 2);
  36 isPixel(ctx, 1,48, 0,255,0,255, "1,48", "0,255,0,255", 2);
  37 isPixel(ctx, 98,1, 0,255,0,255, "98,1", "0,255,0,255", 2);
  38 isPixel(ctx, 98,48, 0,255,0,255, "98,48", "0,255,0,255", 2);
  39 isPixel(ctx, 48,1, 0,255,0,255, "48,1", "0,255,0,255", 2);
  40 isPixel(ctx, 48,48, 0,255,0,255, "48,48", "0,255,0,255", 2);
  41 isPixel(ctx, 51,1, 0,255,0,255, "51,1", "0,255,0,255", 2);
  42 isPixel(ctx, 51,48, 0,255,0,255, "51,48", "0,255,0,255", 2);
  43 isPixel(ctx, 25,25, 0,255,0,255, "25,25", "0,255,0,255", 2);
  44 isPixel(ctx, 75,25, 0,255,0,255, "75,25", "0,255,0,255", 2);
  45
  46 } catch (e) {
  47     _thrown_outer = true;
  48 }
  49 todo(!_thrown_outer, 'should not throw exception');
  50
  51 SimpleTest.finish();
  52
  53 });
  54 </script>
  55 <img src="image_ggrr-256x256.png" id="ggrr-256x256.png" class="resource">
  56