content/canvas/test/test_2d.composite.canvas.source-in.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.composite.canvas.source-in</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 addLoadEvent(function () {
  24
  25 var canvas = document.getElementById('c');
  26 var ctx = canvas.getContext('2d');
  27
  28
  29 var canvas2 = document.createElement('canvas');
  30 canvas2.width = canvas.width;
  31 canvas2.height = canvas.height;
  32 var ctx2 = canvas2.getContext('2d');
  33 ctx2.drawImage(document.getElementById('yellow75.png'), 0, 0);
  34 ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';
  35 ctx.fillRect(0, 0, 100, 50);
  36 ctx.globalCompositeOperation = 'source-in';
  37 ctx.drawImage(canvas2, 0, 0);
  38 isPixel(ctx, 50,25, 255,255,0,95, "50,25", "255,255,0,95", 5);
  39
  40 SimpleTest.finish();
  41
  42 });
  43 </script>
  44 <img src="image_yellow75.png" id="yellow75.png" class="resource">
  45