#

API Documentation for: NEXT
Show: Inherited Protected Private Deprecated

# File:ColorMatrixFilter.js

    /*
    * ColorMatrixFilter
    * Visit http://createjs.com/ for documentation, updates and examples.
    *
    * Copyright (c) 2010 gskinner.com, inc.
    *
    * Permission is hereby granted, free of charge, to any person
    * obtaining a copy of this software and associated documentation
    * files (the "Software"), to deal in the Software without
    * restriction, including without limitation the rights to use,
    * copy, modify, merge, publish, distribute, sublicense, and/or sell
    * copies of the Software, and to permit persons to whom the
    * Software is furnished to do so, subject to the following
    * conditions:
    *
    * The above copyright notice and this permission notice shall be
    * included in all copies or substantial portions of the Software.
    *
    * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
    * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
    * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    * OTHER DEALINGS IN THE SOFTWARE.
    */

    /**
     * @module EaselJS
     */

    // namespace:
    this.createjs = this.createjs||{};

    (function() {
    	"use strict";

    /**
     * Allows you to carry out complex color operations such as modifying saturation, brightness, or inverting. See the
     * {{#crossLink "ColorMatrix"}}{{/crossLink}} for more information on changing colors. For an easier color transform,
     * consider the {{#crossLink "ColorFilter"}}{{/crossLink}}.
     *
     * <h4>Example</h4>
     * This example creates a red circle, inverts its hue, and then saturates it to brighten it up.
     *
     *      var shape = new createjs.Shape().set({x:100,y:100});
     *      shape.graphics.beginFill("#ff0000").drawCircle(0,0,50);
     *
     *      var matrix = new createjs.ColorMatrix().adjustHue(180).adjustSaturation(100);
     *      shape.filters = [
     *          new createjs.ColorMatrixFilter(matrix)
     *      ];
     *
     *      shape.cache(-50, -50, 100, 100);
     *
     * See {{#crossLink "Filter"}}{{/crossLink}} for an more information on applying filters.
     * @class ColorMatrixFilter
     * @constructor
     * @extends Filter
     * @param {Array} matrix A 4x5 matrix describing the color operation to perform. See also the {{#crossLink "ColorMatrix"}}{{/crossLink}}
     * class.
     **/
    var ColorMatrixFilter = function(matrix) {
      this.initialize(matrix);
    };
    var p = ColorMatrixFilter.prototype = new createjs.Filter();

    // public properties:
    	p.matrix = null;

    // constructor:
    	// TODO: detailed docs.
    	/**
    	 * @method initialize
    	 * @protected
    	 * @param {Array} matrix A 4x5 matrix describing the color operation to perform.
    	 **/
    	p.initialize = function(matrix) {
    		this.matrix = matrix;
    	};

    // public methods:
    	p.applyFilter = function(ctx, x, y, width, height, targetCtx, targetX, targetY) {
    		targetCtx = targetCtx || ctx;
    		if (targetX == null) { targetX = x; }
    		if (targetY == null) { targetY = y; }
    		try {
    			var imageData = ctx.getImageData(x, y, width, height);
    		} catch(e) {
    			//if (!this.suppressCrossDomainErrors) throw new Error("unable to access local image data: " + e);
    			return false;
    		}
    		var data = imageData.data;
    		var l = data.length;
    		var r,g,b,a;
    		var mtx = this.matrix;
    		var m0 =  mtx[0],  m1 =  mtx[1],  m2 =  mtx[2],  m3 =  mtx[3],  m4 =  mtx[4];
    		var m5 =  mtx[5],  m6 =  mtx[6],  m7 =  mtx[7],  m8 =  mtx[8],  m9 =  mtx[9];
    		var m10 = mtx[10], m11 = mtx[11], m12 = mtx[12], m13 = mtx[13], m14 = mtx[14];
    		var m15 = mtx[15], m16 = mtx[16], m17 = mtx[17], m18 = mtx[18], m19 = mtx[19];

    		for (var i=0; i<l; i+=4) {
    			r = data[i];
    			g = data[i+1];
    			b = data[i+2];
    			a = data[i+3];
    			data[i] = r*m0+g*m1+b*m2+a*m3+m4; // red
    			data[i+1] = r*m5+g*m6+b*m7+a*m8+m9; // green
    			data[i+2] = r*m10+g*m11+b*m12+a*m13+m14; // blue
    			data[i+3] = r*m15+g*m16+b*m17+a*m18+m19; // alpha
    		}
    		targetCtx.putImageData(imageData, targetX, targetY);
    		return true;
    	};

    	p.toString = function() {
    		return "[ColorMatrixFilter]";
    	};

    	/**
    	 * Returns a clone of this ColorMatrixFilter instance.
    	 * @method clone
    	 * @return {ColorMatrixFilter} A clone of the current ColorMatrixFilter instance.
    	 **/
    	p.clone = function() {
    		return new ColorMatrixFilter(this.matrix);
    	};

    	createjs.ColorMatrixFilter = ColorMatrixFilter;

    }());