content/canvas/test/test_toDataURL.complexcolours.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: toDataURL.complexcolours</title>
   3 <!-- Testing: toDataURL handles non-primary and non-solid colours correctly -->
   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 function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
  11     var pixel = ctx.getImageData(x, y, 1, 1);
  12     var pr = pixel.data[0],
  13         pg = pixel.data[1],
  14         pb = pixel.data[2],
  15         pa = pixel.data[3];
  16     ok(r-d <= pr && pr <= r+d &&
  17        g-d <= pg && pg <= g+d &&
  18        b-d <= pb && pb <= b+d &&
  19        a-d <= pa && pa <= a+d,
  20        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
  21 }
  22 function deferTest() {
  23     _deferred = true;
  24 }
  25 function wrapFunction(f) {
  26     return function () {
  27         f.apply(null, arguments);
  28         SimpleTest.finish();
  29     }
  30 }
  31
  32 SimpleTest.waitForExplicitFinish();
  33 MochiKit.DOM.addLoadEvent(function () {
  34
  35 var canvas = document.getElementById('c');
  36 var ctx = canvas.getContext('2d');
  37
  38 // (These values are chosen to survive relatively alright through being premultiplied)
  39 ctx.fillStyle = 'rgba(1, 3, 254, 1)';
  40 ctx.fillRect(0, 0, 25, 25);
  41 ctx.fillStyle = 'rgba(8, 252, 248, 0.75)';
  42 ctx.fillRect(25, 0, 25, 25);
  43 ctx.fillStyle = 'rgba(6, 10, 250, 0.502)';
  44 ctx.fillRect(50, 0, 25, 25);
  45 ctx.fillStyle = 'rgba(12, 16, 244, 0.25)';
  46 ctx.fillRect(75, 0, 25, 25);
  47 var img = new Image();
  48 deferTest();
  49 img.onload = wrapFunction(function ()
  50 {
  51     ctx.drawImage(img, 0, 25);
  52     // (The alpha values do not really survive float->int conversion, so just
  53     // do approximate comparisons)
  54     netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');
  55     isPixel(ctx, 12,40, 1,3,254,255, "12,40", "1,3,254,255", 0);
  56     isPixel(ctx, 37,40, 8,252,248,191, "37,40", "8,252,248,191", 2);
  57     isPixel(ctx, 62,40, 6,10,250,127, "62,40", "6,10,250,127", 4);
  58     isPixel(ctx, 87,40, 12,16,244,63, "87,40", "12,16,244,63", 8);
  59 });
  60 img.src = canvas.toDataURL();
  61
  62
  63 });
  64 </script>
  65