<!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 canvas2 = document.createElement('canvas' );
canvas2.width = canvas .width;
canvas2.height = canvas .height;
var ctx2 = canvas2.getContext('2d' );
ctx2.drawImage(document.getElementById('yellow75.png' ), 0, 0);
ctx.fillStyle = 'rgba(0, 255, 255, 0.5)' ;
ctx.fillRect(0, 0, 100, 50);
ctx.globalCompositeOperation = 'darken' ;
ctx.drawImage(canvas2, 0, 0);
isPixel(ctx, 50,25, 108,255,36,223, "50,25" , "108,255,36,223" , 5);
SimpleTest.finish();
});
</script >
<img src="image_yellow75.png" id="yellow75.png" class="resource" >
Messung V0.5 C=93 H=94 G=93
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