content/canvas/test/test_2d.composite.globalAlpha.canvaspattern.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.composite.globalAlpha.canvaspattern - bug 401790</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 function todo_isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
  22     var pixel = ctx.getImageData(x, y, 1, 1);
  23     var pr = pixel.data[0],
  24         pg = pixel.data[1],
  25         pb = pixel.data[2],
  26         pa = pixel.data[3];
  27     todo(r-d <= pr && pr <= r+d &&
  28        g-d <= pg && pg <= g+d &&
  29        b-d <= pb && pb <= b+d &&
  30        a-d <= pa && pa <= a+d,
  31        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
  32 }
  33
  34 SimpleTest.waitForExplicitFinish();
  35 MochiKit.DOM.addLoadEvent(function () {
  36
  37 var canvas = document.getElementById('c');
  38 var ctx = canvas.getContext('2d');
  39
  40 var canvas2 = document.createElement('canvas');
  41 canvas2.width = 100;
  42 canvas2.height = 50;
  43 var ctx2 = canvas2.getContext('2d');
  44 ctx2.fillStyle = '#f00';
  45 ctx2.fillRect(0, 0, 100, 50);
  46
  47 ctx.fillStyle = '#0f0';
  48 ctx.fillRect(0, 0, 100, 50);
  49 ctx.fillStyle = ctx.createPattern(canvas2, 'no-repeat');
  50 ctx.globalAlpha = 0.01; // avoid any potential alpha=0 optimisations
  51 ctx.fillRect(0, 0, 100, 50);
  52 isPixel(ctx, 50,25, 2,253,0,255, "50,25", "2,253,0,255", 2);
  53
  54 SimpleTest.finish();
  55
  56 });
  57 </script>
  58