gecko/content/canvas/test/test_toDataURL.complexcolours.html

66 lines
2.1 KiB
HTML

<!DOCTYPE HTML>
<title>Canvas test: toDataURL.complexcolours</title>
<!-- Testing: toDataURL handles non-primary and non-solid colours correctly -->
<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);
}
function deferTest() {
_deferred = true;
}
function wrapFunction(f) {
return function () {
f.apply(null, arguments);
SimpleTest.finish();
}
}
SimpleTest.waitForExplicitFinish();
MochiKit.DOM.addLoadEvent(function () {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
// (These values are chosen to survive relatively alright through being premultiplied)
ctx.fillStyle = 'rgba(1, 3, 254, 1)';
ctx.fillRect(0, 0, 25, 25);
ctx.fillStyle = 'rgba(8, 252, 248, 0.75)';
ctx.fillRect(25, 0, 25, 25);
ctx.fillStyle = 'rgba(6, 10, 250, 0.502)';
ctx.fillRect(50, 0, 25, 25);
ctx.fillStyle = 'rgba(12, 16, 244, 0.25)';
ctx.fillRect(75, 0, 25, 25);
var img = new Image();
deferTest();
img.onload = wrapFunction(function ()
{
ctx.drawImage(img, 0, 25);
// (The alpha values do not really survive float->int conversion, so just
// do approximate comparisons)
netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');
isPixel(ctx, 12,40, 1,3,254,255, "12,40", "1,3,254,255", 0);
isPixel(ctx, 37,40, 8,252,248,191, "37,40", "8,252,248,191", 2);
isPixel(ctx, 62,40, 6,10,250,127, "62,40", "6,10,250,127", 4);
isPixel(ctx, 87,40, 12,16,244,63, "87,40", "12,16,244,63", 8);
});
img.src = canvas.toDataURL();
});
</script>