basic enhancements api implemented

2010-07-15 09:40:02 +00:00 · 2010-07-15 09:40:02 +00:00 · 4150d83b3e
commit 4150d83b3e
parent 5dc6f6ae89
6 changed files with 684 additions and 6 deletions
--- a/lib/pixastic/actions/sharpen.js
+++ b/lib/pixastic/actions/sharpen.js
@ -0,0 +1,110 @@
+/*
+ * Pixastic Lib - Sharpen filter - v0.1.0
+ * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
+ * License: [http://www.pixastic.com/lib/license.txt]
+ */
+
+Pixastic.Actions.sharpen = {
+	process : function(params) {
+
+		var strength = 0;
+		if (typeof params.options.amount != "undefined")
+			strength = parseFloat(params.options.amount)||0;
+
+		if (strength < 0) strength = 0;
+		if (strength > 1) strength = 1;
+
+		if (Pixastic.Client.hasCanvasImageData()) {
+			var data = Pixastic.prepareData(params);
+			var dataCopy = Pixastic.prepareData(params, true)
+
+			var mul = 15;
+			var mulOther = 1 + 3*strength;
+
+			var kernel = [
+				[0, 	-mulOther, 	0],
+				[-mulOther, 	mul, 	-mulOther],
+				[0, 	-mulOther, 	0]
+			];
+
+			var weight = 0;
+			for (var i=0;i<3;i++) {
+				for (var j=0;j<3;j++) {
+					weight += kernel[i][j];
+				}
+			}
+
+			weight = 1 / weight;
+
+			var rect = params.options.rect;
+			var w = rect.width;
+			var h = rect.height;
+
+			mul *= weight;
+			mulOther *= weight;
+
+			var w4 = w*4;
+			var y = h;
+			do {
+				var offsetY = (y-1)*w4;
+
+				var nextY = (y == h) ? y - 1 : y;
+				var prevY = (y == 1) ? 0 : y-2;
+
+				var offsetYPrev = prevY*w4;
+				var offsetYNext = nextY*w4;
+
+				var x = w;
+				do {
+					var offset = offsetY + (x*4-4);
+
+					var offsetPrev = offsetYPrev + ((x == 1) ? 0 : x-2) * 4;
+					var offsetNext = offsetYNext + ((x == w) ? x-1 : x) * 4;
+
+					var r = ((
+						- dataCopy[offsetPrev]
+						- dataCopy[offset-4]
+						- dataCopy[offset+4]
+						- dataCopy[offsetNext])		* mulOther
+						+ dataCopy[offset] 	* mul
+						);
+
+					var g = ((
+						- dataCopy[offsetPrev+1]
+						- dataCopy[offset-3]
+						- dataCopy[offset+5]
+						- dataCopy[offsetNext+1])	* mulOther
+						+ dataCopy[offset+1] 	* mul
+						);
+
+					var b = ((
+						- dataCopy[offsetPrev+2]
+						- dataCopy[offset-2]
+						- dataCopy[offset+6]
+						- dataCopy[offsetNext+2])	* mulOther
+						+ dataCopy[offset+2] 	* mul
+						);
+
+
+					if (r < 0 ) r = 0;
+					if (g < 0 ) g = 0;
+					if (b < 0 ) b = 0;
+					if (r > 255 ) r = 255;
+					if (g > 255 ) g = 255;
+					if (b > 255 ) b = 255;
+
+					data[offset] = r;
+					data[offset+1] = g;
+					data[offset+2] = b;
+
+				} while (--x);
+			} while (--y);
+
+			return true;
+
+		}
+	},
+	checkSupport : function() {
+		return Pixastic.Client.hasCanvasImageData();
+	}
+}