1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
<!DOCTYPE HTML>
<title>Canvas test: 2d.composite.canvas.xor</title>
<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();
addLoadEvent(function () {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
var text = "I";
var colorTop = 'rgba(255,0,0,1)';
var colorBottom = 'rgba(0,255,0,1)';
var inset = 10;
var grad = ctx.createLinearGradient(inset, inset, inset, inset + 30);
// add color stops
grad.addColorStop(0, colorTop);
grad.addColorStop(1, colorBottom);
ctx.fillStyle = grad;
ctx.textBaseline = 'top';
ctx.font = '110px sans-serif'
ctx.fillText(text, -10, -20);
ctx.fillText(text, -8, -20);
ctx.fillText(text, -6, -20);
ctx.fillText(text, -4, -20);
ctx.fillText(text, -2, -20);
ctx.fillText(text, 0, -20);
ctx.fillText(text, 2, -20);
ctx.fillText(text, 4, -20);
ctx.fillText(text, 6, -20);
isPixel(ctx, 15,0, 255,0,0,255, "15,0", "255,0,0,255", 5);
isPixel(ctx, 15,49, 0,255,0,255, "15,49", "0,255,0,255", 5);
SimpleTest.finish();
});
</script>
|
