зеркало из https://github.com/mozilla/pjs.git
66 строки
2.1 KiB
HTML
66 строки
2.1 KiB
HTML
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<!DOCTYPE HTML>
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<title>Canvas test: toDataURL.complexcolours</title>
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<script src="/MochiKit/MochiKit.js"></script>
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
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<body>
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<canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
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<script>
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var _deferred = false;
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function isPixel(ctx, x,y, r,g,b,a, pos, colour, d, f) {
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var pixel = ctx.getImageData(x, y, 1, 1);
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var pr = pixel.data[0],
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pg = pixel.data[1],
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pb = pixel.data[2],
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pa = pixel.data[3];
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(f || ok)(r-d <= pr && pr <= r+d &&
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g-d <= pg && pg <= g+d &&
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b-d <= pb && pb <= b+d &&
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a-d <= pa && pa <= a+d,
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"pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
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}
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function deferTest() {
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_deferred = true;
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}
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function wrapFunction(f) {
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return function () {
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f.apply(null, arguments);
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SimpleTest.finish();
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}
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}
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SimpleTest.waitForExplicitFinish();
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MochiKit.DOM.addLoadEvent(function () {
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var canvas = document.getElementById('c');
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var ctx = canvas.getContext('2d');
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// (These values are chosen to survive relatively alright through being premultiplied)
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ctx.fillStyle = 'rgba(1, 3, 254, 1)';
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ctx.fillRect(0, 0, 25, 25);
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ctx.fillStyle = 'rgba(8, 252, 248, 0.75)';
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ctx.fillRect(25, 0, 25, 25);
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ctx.fillStyle = 'rgba(6, 10, 250, 0.502)';
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ctx.fillRect(50, 0, 25, 25);
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ctx.fillStyle = 'rgba(12, 16, 244, 0.25)';
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ctx.fillRect(75, 0, 25, 25);
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var img = new Image();
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deferTest();
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img.onload = wrapFunction(function ()
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{
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ctx.drawImage(img, 0, 25);
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// (The alpha values do not really survive float->int conversion, so just
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// do approximate comparisons)
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netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');
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isPixel(ctx, 12,40, 1,3,254,255, "12,40", "1,3,254,255", 0);
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isPixel(ctx, 37,40, 8,252,248,191, "37,40", "8,252,248,191", 2);
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isPixel(ctx, 62,40, 6,10,250,127, "62,40", "6,10,250,127", 4);
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isPixel(ctx, 87,40, 12,16,244,63, "87,40", "12,16,244,63", 8);
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});
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img.src = canvas.toDataURL();
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if (!_deferred) SimpleTest.finish();
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});
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</script>
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