dom/canvas/test/test_2d.fill.pattern.imageSmoothingEnabled.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.fill.pattern.imageSmoothingEnabled</title>
   3 <!-- Testing: That imageSmoothingEnabled is taken into account when doing pattern fills-->
   4 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   5 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   6 <body>
   7 <canvas id="c" width="128" height="128"><p class="fallback">FAIL (fallback content)</p></canvas>
   8 <img id="img">
   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
  23 function isNotPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
  24     var pixel = ctx.getImageData(x, y, 1, 1);
  25     var pr = pixel.data[0],
  26         pg = pixel.data[1],
  27         pb = pixel.data[2],
  28         pa = pixel.data[3];
  29     ok(!(r-d <= pr && pr <= r+d &&
  30        g-d <= pg && pg <= g+d &&
  31        b-d <= pb && pb <= b+d &&
  32        a-d <= pa && pa <= a+d),
  33        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; did not expect "+colour+" +/- "+d);
  34 }
  35
  36 SimpleTest.waitForExplicitFinish();
  37 addLoadEvent(function () {
  38
  39 var canvas = document.getElementById('c');
  40 var ctx = canvas.getContext('2d');
  41
  42 var img = document.getElementById("img");
  43 img.src = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==";
  44
  45 img.onload = function () {
  46   ctx.imageSmoothingEnabled = false;
  47   ctx.save();
  48   ctx.fillRect(0, 0, canvas.width, canvas.height);
  49   ctx.scale(16, 16);
  50   ctx.fillStyle = ctx.createPattern(img, 'no-repeat');
  51   ctx.fillRect(0, 0, 8, 8);
  52   ctx.restore();
  53
  54   // Check for nearest filtering.
  55   isPixel(ctx, 0,0, 0,0,0,255, "0,0", "0,0,0,255", 0);
  56   isPixel(ctx, 14,14, 0,0,0,255, "14,14", "0,0,0,255", 0);
  57   isPixel(ctx, 15,15, 0,0,0,255, "15,15", "0,0,0,255", 0);
  58   isPixel(ctx, 16,16, 255,0,0,255, "16,16", "255,0,0,255", 0);
  59
  60   ctx.imageSmoothingEnabled = true;
  61   ctx.save();
  62   ctx.fillRect(0, 0, canvas.width, canvas.height);
  63   ctx.scale(16, 16);
  64   ctx.fillStyle = ctx.createPattern(img, 'no-repeat');
  65   ctx.fillRect(0, 0, 8, 8);
  66   ctx.restore();
  67
  68   // Check that nearest filtering is not happening.
  69   isPixel(ctx, 0,0, 0,0,0,255, "0,0", "0,0,0,255", 0);
  70   isNotPixel(ctx, 14,14, 0,0,0,255, "14,14", "0,0,0,255", 0);
  71   isNotPixel(ctx, 15,15, 0,0,0,255, "15,15", "0,0,0,255", 0);
  72   isNotPixel(ctx, 16,16, 255,0,0,255, "16,16", "255,0,0,255", 0);
  73   isPixel(ctx, 32,32, 255,0,0,255, "32,32", "255,0,0,255", 0);
  74   SimpleTest.finish();
  75 }
  76
  77 });
  78 </script>
  79