dom/canvas/test/test_2d.composite.uncovered.image.destination-in.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.composite.uncovered.image.destination-in</title>
   3 <!-- Testing: drawImage() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged. -->
   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 addLoadEvent(function () {
  36
  37 var canvas = document.getElementById('c');
  38 var ctx = canvas.getContext('2d');
  39
  40
  41 ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';
  42 ctx.fillRect(0, 0, 100, 50);
  43 ctx.globalCompositeOperation = 'destination-in';
  44 ctx.drawImage(document.getElementById('yellow.png'), 40, 40, 10, 10, 40, 50, 10, 10)
  45 isPixel(ctx, 15,15, 0,0,0,0, "15,15", "0,0,0,0", 5);
  46 isPixel(ctx, 50,25, 0,0,0,0, "50,25", "0,0,0,0", 5);
  47
  48 SimpleTest.finish();
  49
  50 });
  51 </script>
  52 <img src="image_yellow.png" id="yellow.png" class="resource">
  53