/*
 * Pixastic Lib - Color adjust filter - v0.1.1
 * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
 * License: [http://www.pixastic.com/lib/license.txt]
 */

Pixastic.Actions.coloradjust = {

	process : function(params) {
		var red = parseFloat(params.options.red) || 0;
		var green = parseFloat(params.options.green) || 0;
		var blue = parseFloat(params.options.blue) || 0;

		red = Math.round(red*255);
		green = Math.round(green*255);
		blue = Math.round(blue*255);

		if (Pixastic.Client.hasCanvasImageData()) {
			var data = Pixastic.prepareData(params);
			var rect = params.options.rect;

			var p = rect.width*rect.height;
			var pix = p*4, pix1, pix2;

			var r, g, b;
			while (p--) {
				pix -= 4;

				if (red) {
					if ((r = data[pix] + red) < 0 ) 
						data[pix] = 0;
					else if (r > 255 ) 
						data[pix] = 255;
					else
						data[pix] = r;
				}

				if (green) {
					if ((g = data[pix1=pix+1] + green) < 0 ) 
						data[pix1] = 0;
					else if (g > 255 ) 
						data[pix1] = 255;
					else
						data[pix1] = g;
				}

				if (blue) {
					if ((b = data[pix2=pix+2] + blue) < 0 ) 
						data[pix2] = 0;
					else if (b > 255 ) 
						data[pix2] = 255;
					else
						data[pix2] = b;
				}
			}
			return true;
		}
	},
	checkSupport : function() {
		return (Pixastic.Client.hasCanvasImageData());
	}
}