37 lines
No EOL
1 KiB
JavaScript
37 lines
No EOL
1 KiB
JavaScript
/*
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* Pixastic Lib - Desaturation filter - v0.1.1
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* Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
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* License: [http://www.pixastic.com/lib/license.txt]
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*/
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Pixastic.Actions.desaturate = {
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process : function(params) {
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var useAverage = !!(params.options.average && params.options.average != "false");
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if (Pixastic.Client.hasCanvasImageData()) {
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var data = Pixastic.prepareData(params);
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var rect = params.options.rect;
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var w = rect.width;
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var h = rect.height;
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var p = w*h;
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var pix = p*4, pix1, pix2;
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if (useAverage) {
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while (p--)
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data[pix-=4] = data[pix1=pix+1] = data[pix2=pix+2] = (data[pix]+data[pix1]+data[pix2])/3
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} else {
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while (p--)
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data[pix-=4] = data[pix1=pix+1] = data[pix2=pix+2] = (data[pix]*0.3 + data[pix1]*0.59 + data[pix2]*0.11);
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}
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return true;
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} else if (Pixastic.Client.isIE()) {
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params.image.style.filter += " gray";
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return true;
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}
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},
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checkSupport : function() {
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return (Pixastic.Client.hasCanvasImageData() || Pixastic.Client.isIE());
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}
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} |