gecko/content/canvas/test/test_2d.gradient.interpolate.overlap.html

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HTML

<!DOCTYPE HTML>
<title>Canvas test: 2d.gradient.interpolate.overlap</title>
<script src="/MochiKit/MochiKit.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
<body>
<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<script>
var _deferred = false;
function isPixel(ctx, x,y, r,g,b,a, pos, colour, d, f) {
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];
(f || 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');
canvas.width = 200;
var g = ctx.createLinearGradient(0, 0, 200, 0);
g.addColorStop(0, '#f00');
g.addColorStop(0, '#ff0');
g.addColorStop(0.25, '#00f');
g.addColorStop(0.25, '#0f0');
g.addColorStop(0.25, '#0f0');
g.addColorStop(0.25, '#0f0');
g.addColorStop(0.25, '#ff0');
g.addColorStop(0.5, '#00f');
g.addColorStop(0.5, '#0f0');
g.addColorStop(0.75, '#00f');
g.addColorStop(0.75, '#f00');
g.addColorStop(0.75, '#ff0');
g.addColorStop(0.5, '#0f0');
g.addColorStop(0.5, '#0f0');
g.addColorStop(0.5, '#ff0');
g.addColorStop(1, '#00f');
ctx.fillStyle = g;
ctx.fillRect(0, 0, 200, 50);
isPixel(ctx, 49,25, 0,0,255,255, "49,25", "0,0,255,255", 16);
isPixel(ctx, 51,25, 255,255,0,255, "51,25", "255,255,0,255", 16);
isPixel(ctx, 99,25, 0,0,255,255, "99,25", "0,0,255,255", 16);
isPixel(ctx, 101,25, 255,255,0,255, "101,25", "255,255,0,255", 16);
isPixel(ctx, 149,25, 0,0,255,255, "149,25", "0,0,255,255", 16);
isPixel(ctx, 151,25, 255,255,0,255, "151,25", "255,255,0,255", 16);
if (!_deferred) SimpleTest.finish();
});
</script>