dom/canvas/test/test_2d.drawImage.zerocanvas.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.drawImage.zerocanvas</title>
   3 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   4 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   5 <body>
   6 <canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
   7 <script>
   8 function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
   9     var pixel = ctx.getImageData(x, y, 1, 1);
  10     var pr = pixel.data[0],
  11         pg = pixel.data[1],
  12         pb = pixel.data[2],
  13         pa = pixel.data[3];
  14     ok(r-d <= pr && pr <= r+d &&
  15        g-d <= pg && pg <= g+d &&
  16        b-d <= pb && pb <= b+d &&
  17        a-d <= pa && pa <= a+d,
  18        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
  19 }
  20
  21 SimpleTest.waitForExplicitFinish();
  22 addLoadEvent(function () {
  23
  24 var canvas = document.getElementById('c');
  25 var ctx = canvas.getContext('2d');
  26
  27 ctx.fillStyle = '#0f0';
  28 ctx.fillRect(0, 0, 100, 50);
  29
  30 var canvas2 = document.createElement('canvas');
  31 canvas2.width = 0;
  32 canvas2.height = 10;
  33 var _thrown = undefined; try {
  34   ctx.drawImage(canvas2, 0, 0);
  35 } catch (e) { _thrown = e }; ok(_thrown && _thrown.name == "InvalidStateError" && _thrown.code == DOMException.INVALID_STATE_ERR, "should throw InvalidStateError");
  36
  37 canvas2.width = 10;
  38 canvas2.height = 0;
  39 var _thrown = undefined; try {
  40   ctx.drawImage(canvas2, 0, 0);
  41 } catch (e) { _thrown = e }; ok(_thrown && _thrown.name == "InvalidStateError" && _thrown.code == DOMException.INVALID_STATE_ERR, "should throw InvalidStateError");
  42
  43 canvas2.width = 0;
  44 canvas2.height = 0;
  45 var _thrown = undefined; try {
  46   ctx.drawImage(canvas2, 0, 0);
  47 } catch (e) { _thrown = e }; ok(_thrown && _thrown.name == "InvalidStateError" && _thrown.code == DOMException.INVALID_STATE_ERR, "should throw InvalidStateError");
  48
  49 isPixel(ctx, 50,25, 0,255,0,255, "50,25", "0,255,0,255", 2);
  50
  51 SimpleTest.finish();
  52
  53 });
  54 </script>
  55