110 lines
2.3 KiB
JavaScript
110 lines
2.3 KiB
JavaScript
/*
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* Pixastic Lib - Sharpen filter - v0.1.0
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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.sharpen = {
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process : function(params) {
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var strength = 0;
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if (typeof params.options.amount != "undefined")
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strength = parseFloat(params.options.amount)||0;
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if (strength < 0) strength = 0;
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if (strength > 1) strength = 1;
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if (Pixastic.Client.hasCanvasImageData()) {
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var data = Pixastic.prepareData(params);
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var dataCopy = Pixastic.prepareData(params, true)
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var mul = 15;
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var mulOther = 1 + 3*strength;
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var kernel = [
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[0, -mulOther, 0],
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[-mulOther, mul, -mulOther],
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[0, -mulOther, 0]
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];
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var weight = 0;
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for (var i=0;i<3;i++) {
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for (var j=0;j<3;j++) {
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weight += kernel[i][j];
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}
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}
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weight = 1 / weight;
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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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mul *= weight;
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mulOther *= weight;
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var w4 = w*4;
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var y = h;
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do {
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var offsetY = (y-1)*w4;
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var nextY = (y == h) ? y - 1 : y;
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var prevY = (y == 1) ? 0 : y-2;
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var offsetYPrev = prevY*w4;
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var offsetYNext = nextY*w4;
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var x = w;
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do {
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var offset = offsetY + (x*4-4);
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var offsetPrev = offsetYPrev + ((x == 1) ? 0 : x-2) * 4;
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var offsetNext = offsetYNext + ((x == w) ? x-1 : x) * 4;
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var r = ((
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- dataCopy[offsetPrev]
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- dataCopy[offset-4]
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- dataCopy[offset+4]
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- dataCopy[offsetNext]) * mulOther
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+ dataCopy[offset] * mul
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);
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var g = ((
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- dataCopy[offsetPrev+1]
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- dataCopy[offset-3]
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- dataCopy[offset+5]
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- dataCopy[offsetNext+1]) * mulOther
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+ dataCopy[offset+1] * mul
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);
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var b = ((
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- dataCopy[offsetPrev+2]
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- dataCopy[offset-2]
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- dataCopy[offset+6]
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- dataCopy[offsetNext+2]) * mulOther
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+ dataCopy[offset+2] * mul
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);
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if (r < 0 ) r = 0;
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if (g < 0 ) g = 0;
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if (b < 0 ) b = 0;
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if (r > 255 ) r = 255;
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if (g > 255 ) g = 255;
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if (b > 255 ) b = 255;
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data[offset] = r;
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data[offset+1] = g;
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data[offset+2] = b;
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} while (--x);
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} while (--y);
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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();
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}
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}
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