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Merge pull request #2972 from brendandahl/blend-mode-feature-test

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Add feature test for blend mode.
This commit is contained in:
Yury Delendik 2013-03-27 05:38:25 -07:00
commit f88c0e9ca1
1 changed files with 28 additions and 0 deletions
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28
test/features/tests.js
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@ -595,6 +595,34 @@ var tests = [
},
impact: 'Important',
area: 'Core'
},
{
id: 'Canvas Blend Mode',
name: 'Canvas supports extended blend modes',
run: function () {
var fail = { output: 'Failed', emulated: 'No' };
var ctx = document.createElement('canvas').getContext('2d');
ctx.canvas.width = 1;
ctx.canvas.height = 1;
var mode = 'difference';
ctx.globalCompositeOperation = mode;
if (ctx.globalCompositeOperation !== mode) {
return fail;
}
// Chrome supports setting the value, but it may not actually be
// implemented, so we have to actually test the blend mode.
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 1, 1);
ctx.fillStyle = 'blue';
ctx.fillRect(0, 0, 1, 1);
var pix = ctx.getImageData(0, 0, 1, 1).data;
if (pix[0] !== 255 || pix[1] !== 0 || pix[2] !== 255) {
return fail;
}
return { output: 'Success', emulated: '' };
},
impact: 'Important',
area: 'Core'
}
];