111 lines
3 KiB
JavaScript
Executable file
111 lines
3 KiB
JavaScript
Executable file
/*
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* Pixastic Lib - USM - 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.unsharpmask = {
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process : function(params) {
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var amount = (parseFloat(params.options.amount)||0);
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var blurAmount = parseFloat(params.options.radius)||0;
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var threshold = parseFloat(params.options.threshold)||0;
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amount = Math.min(500,Math.max(0,amount)) / 2;
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blurAmount = Math.min(5,Math.max(0,blurAmount)) / 10;
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threshold = Math.min(255,Math.max(0,threshold));
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threshold--;
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var thresholdNeg = -threshold;
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amount *= 0.016;
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amount++;
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if (Pixastic.Client.hasCanvasImageData()) {
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var rect = params.options.rect;
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var blurCanvas = document.createElement("canvas");
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blurCanvas.width = params.width;
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blurCanvas.height = params.height;
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var blurCtx = blurCanvas.getContext("2d");
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blurCtx.drawImage(params.canvas,0,0);
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var scale = 2;
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var smallWidth = Math.round(params.width / scale);
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var smallHeight = Math.round(params.height / scale);
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var copy = document.createElement("canvas");
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copy.width = smallWidth;
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copy.height = smallHeight;
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var steps = Math.round(blurAmount * 20);
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var copyCtx = copy.getContext("2d");
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for (var i=0;i<steps;i++) {
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var scaledWidth = Math.max(1,Math.round(smallWidth - i));
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var scaledHeight = Math.max(1,Math.round(smallHeight - i));
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copyCtx.clearRect(0,0,smallWidth,smallHeight);
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copyCtx.drawImage(
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blurCanvas,
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0,0,params.width,params.height,
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0,0,scaledWidth,scaledHeight
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);
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blurCtx.clearRect(0,0,params.width,params.height);
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blurCtx.drawImage(
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copy,
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0,0,scaledWidth,scaledHeight,
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0,0,params.width,params.height
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);
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}
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var data = Pixastic.prepareData(params);
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var blurData = Pixastic.prepareData({canvas:blurCanvas,options:params.options});
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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 x = w;
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do {
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var offset = offsetY + (x*4-4);
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var difR = data[offset] - blurData[offset];
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if (difR > threshold || difR < thresholdNeg) {
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var blurR = blurData[offset];
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blurR = amount * difR + blurR;
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data[offset] = blurR > 255 ? 255 : (blurR < 0 ? 0 : blurR);
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}
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var difG = data[offset+1] - blurData[offset+1];
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if (difG > threshold || difG < thresholdNeg) {
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var blurG = blurData[offset+1];
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blurG = amount * difG + blurG;
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data[offset+1] = blurG > 255 ? 255 : (blurG < 0 ? 0 : blurG);
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}
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var difB = data[offset+2] - blurData[offset+2];
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if (difB > threshold || difB < thresholdNeg) {
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var blurB = blurData[offset+2];
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blurB = amount * difB + blurB;
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data[offset+2] = blurB > 255 ? 255 : (blurB < 0 ? 0 : blurB);
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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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}
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