89 lines
No EOL
2.4 KiB
JavaScript
Executable file
89 lines
No EOL
2.4 KiB
JavaScript
Executable file
/*
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* Pixastic Lib - Remove noise - v0.1.0
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* Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
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* MIT License [http://www.opensource.org/licenses/mit-license.php]
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*/
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Pixastic.Actions.removenoise = {
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process : function(params) {
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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 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*w*4;
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var offsetYNext = nextY*w*4;
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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 minR, maxR, minG, maxG, minB, maxB;
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minR = maxR = data[offsetPrev];
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var r1 = data[offset-4], r2 = data[offset+4], r3 = data[offsetNext];
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if (r1 < minR) minR = r1;
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if (r2 < minR) minR = r2;
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if (r3 < minR) minR = r3;
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if (r1 > maxR) maxR = r1;
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if (r2 > maxR) maxR = r2;
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if (r3 > maxR) maxR = r3;
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minG = maxG = data[offsetPrev+1];
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var g1 = data[offset-3], g2 = data[offset+5], g3 = data[offsetNext+1];
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if (g1 < minG) minG = g1;
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if (g2 < minG) minG = g2;
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if (g3 < minG) minG = g3;
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if (g1 > maxG) maxG = g1;
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if (g2 > maxG) maxG = g2;
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if (g3 > maxG) maxG = g3;
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minB = maxB = data[offsetPrev+2];
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var b1 = data[offset-2], b2 = data[offset+6], b3 = data[offsetNext+2];
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if (b1 < minB) minB = b1;
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if (b2 < minB) minB = b2;
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if (b3 < minB) minB = b3;
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if (b1 > maxB) maxB = b1;
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if (b2 > maxB) maxB = b2;
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if (b3 > maxB) maxB = b3;
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if (data[offset] > maxR) {
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data[offset] = maxR;
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} else if (data[offset] < minR) {
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data[offset] = minR;
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}
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if (data[offset+1] > maxG) {
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data[offset+1] = maxG;
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} else if (data[offset+1] < minG) {
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data[offset+1] = minG;
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}
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if (data[offset+2] > maxB) {
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data[offset+2] = maxB;
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} else if (data[offset+2] < minB) {
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data[offset+2] = minB;
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}
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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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} |