content/canvas/test/test_2d.drawImage.zerocanvas.html
author Ms2ger <ms2ger@gmail.com>
Sat, 11 Jun 2011 09:52:27 +0200
changeset 71416 8b3315430b6d608ce0e3dca08490e48caeeb1243
child 75085 f1c41350c548e5f64d206e7559a28d251ddaefff
permissions -rw-r--r--
Bug 663194 - Calling drawImage with zero-size canvas should throw INVALID_STATE_ERR; r=sicking

<!DOCTYPE HTML>
<title>Canvas test: 2d.drawImage.zerocanvas</title>
<script src="/MochiKit/MochiKit.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<body>
<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<script>
function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
    var pixel = ctx.getImageData(x, y, 1, 1);
    var pr = pixel.data[0],
        pg = pixel.data[1],
        pb = pixel.data[2],
        pa = pixel.data[3];
    ok(r-d <= pr && pr <= r+d &&
       g-d <= pg && pg <= g+d &&
       b-d <= pb && pb <= b+d &&
       a-d <= pa && pa <= a+d,
       "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
}

SimpleTest.waitForExplicitFinish();
MochiKit.DOM.addLoadEvent(function () {

var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');

ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 100, 50);

var canvas2 = document.createElement('canvas');
canvas2.width = 0;
canvas2.height = 10;
var _thrown = undefined; try {
  ctx.drawImage(canvas2, 0, 0);
} catch (e) { _thrown = e }; ok(_thrown && _thrown.code == DOMException.INVALID_STATE_ERR, "should throw INVALID_STATE_ERR");

canvas2.width = 10;
canvas2.height = 0;
var _thrown = undefined; try {
  ctx.drawImage(canvas2, 0, 0);
} catch (e) { _thrown = e }; ok(_thrown && _thrown.code == DOMException.INVALID_STATE_ERR, "should throw INVALID_STATE_ERR");

canvas2.width = 0;
canvas2.height = 0;
var _thrown = undefined; try {
  ctx.drawImage(canvas2, 0, 0);
} catch (e) { _thrown = e }; ok(_thrown && _thrown.code == DOMException.INVALID_STATE_ERR, "should throw INVALID_STATE_ERR");

isPixel(ctx, 50,25, 0,255,0,255, "50,25", "0,255,0,255", 2);

SimpleTest.finish();

});
</script>