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33 lines
957 B
JavaScript
33 lines
957 B
JavaScript
/*!
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{
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"name": "canvas blending support",
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"property": "canvasblending",
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"caniuse": "canvas-blending",
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"tags": ["canvas"],
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"notes": [{
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"name": "W3C Spec",
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"href": "https://drafts.fxtf.org/compositing-1/"
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}, {
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"name": "Article",
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"href": "https://web.archive.org/web/20171003232921/http://blogs.adobe.com/webplatform/2013/01/28/blending-features-in-canvas/"
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}]
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}
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!*/
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/* DOC
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Detects if Photoshop style blending modes are available in canvas.
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*/
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define(['Modernizr', 'createElement', 'test/canvas'], function(Modernizr, createElement) {
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Modernizr.addTest('canvasblending', function() {
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if (Modernizr.canvas === false) {
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return false;
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}
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var ctx = createElement('canvas').getContext('2d');
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// firefox 3 throws an error when setting an invalid `globalCompositeOperation`
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try {
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ctx.globalCompositeOperation = 'screen';
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} catch (e) {}
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return ctx.globalCompositeOperation === 'screen';
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});
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});
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