#

API Documentation for: NEXT
Show: Inherited Protected Private Deprecated

# File:ColorMatrix.js

    /*
    * ColorMatrix
    * 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";

    	/**
    	 * Provides helper functions for assembling a matrix for use with the {{#crossLink "ColorMatrixFilter"}}{{/crossLink}},
    	 * or can be used directly as the matrix for a ColorMatrixFilter. Most methods return the instance to facilitate
    	 * chained calls.
    	 *
    	 * <h4>Example</h4>
    	 *
    	 *      myColorMatrix.adjustHue(20).adjustBrightness(50);
    	 *
    	 * See {{#crossLink "Filter"}}{{/crossLink}} for an example of how to apply filters, or {{#crossLink "ColorMatrixFilter"}}{{/crossLink}}
    	 * for an example of how to use ColorMatrix to change a DisplayObject's color.
    	 * @class ColorMatrix
    	 * @param {Number} brightness
    	 * @param {Number} contrast
    	 * @param {Number} saturation
    	 * @param {Number} hue
    	 * @constructor
    	 **/
    	var ColorMatrix = function(brightness, contrast, saturation, hue) {
    	  this.initialize(brightness, contrast, saturation, hue);
    	};
    	var p = ColorMatrix.prototype;

    	/**
    	 * Array of delta values for contrast calculations.
    	 * @property DELTA_INDEX
    	 * @type Array
    	 * @protected
    	 * @static
    	 **/
    	ColorMatrix.DELTA_INDEX = [
    		0,    0.01, 0.02, 0.04, 0.05, 0.06, 0.07, 0.08, 0.1,  0.11,
    		0.12, 0.14, 0.15, 0.16, 0.17, 0.18, 0.20, 0.21, 0.22, 0.24,
    		0.25, 0.27, 0.28, 0.30, 0.32, 0.34, 0.36, 0.38, 0.40, 0.42,
    		0.44, 0.46, 0.48, 0.5,  0.53, 0.56, 0.59, 0.62, 0.65, 0.68,
    		0.71, 0.74, 0.77, 0.80, 0.83, 0.86, 0.89, 0.92, 0.95, 0.98,
    		1.0,  1.06, 1.12, 1.18, 1.24, 1.30, 1.36, 1.42, 1.48, 1.54,
    		1.60, 1.66, 1.72, 1.78, 1.84, 1.90, 1.96, 2.0,  2.12, 2.25,
    		2.37, 2.50, 2.62, 2.75, 2.87, 3.0,  3.2,  3.4,  3.6,  3.8,
    		4.0,  4.3,  4.7,  4.9,  5.0,  5.5,  6.0,  6.5,  6.8,  7.0,
    		7.3,  7.5,  7.8,  8.0,  8.4,  8.7,  9.0,  9.4,  9.6,  9.8,
    		10.0
    	];

    	/**
    	 * Identity matrix values.
    	 * @property IDENTITY_MATRIX
    	 * @type Array
    	 * @protected
    	 * @static
    	 **/
    	ColorMatrix.IDENTITY_MATRIX = [
    		1,0,0,0,0,
    		0,1,0,0,0,
    		0,0,1,0,0,
    		0,0,0,1,0,
    		0,0,0,0,1
    	];

    	/**
    	 * The constant length of a color matrix.
    	 * @property LENGTH
    	 * @type Number
    	 * @protected
    	 * @static
    	 **/
    	ColorMatrix.LENGTH = ColorMatrix.IDENTITY_MATRIX.length;

    	/**
    	 * Initialization method.
    	 * @method initialize
    	 * @param {Number} brightness
    	 * @param {Number} contrast
    	 * @param {Number} saturation
    	 * @param {Number} hue
    	 * @protected
    	 */
    	p.initialize = function(brightness,contrast,saturation,hue) {
    		this.reset();
    		this.adjustColor(brightness,contrast,saturation,hue);
    		return this;
    	};

    	/**
    	 * Resets the matrix to identity values.
    	 * @method reset
    	 * @return {ColorMatrix} The ColorMatrix instance the method is called on (useful for chaining calls.)
    	 */
    	p.reset = function() {
    		return this.copyMatrix(ColorMatrix.IDENTITY_MATRIX);
    	};

    	/**
    	 * Shortcut method to adjust brightness, contrast, saturation and hue.
    	 * Equivalent to calling adjustHue(hue), adjustContrast(contrast),
    	 * adjustBrightness(brightness), adjustSaturation(saturation), in that order.
    	 * @method adjustColor
    	 * @param {Number} brightness
    	 * @param {Number} contrast
    	 * @param {Number} saturation
    	 * @param {Number} hue
    	 * @return {ColorMatrix} The ColorMatrix instance the method is called on (useful for chaining calls.)
    	 **/
    	p.adjustColor = function(brightness,contrast,saturation,hue) {
    		this.adjustHue(hue);
    		this.adjustContrast(contrast);
    		this.adjustBrightness(brightness);
    		return this.adjustSaturation(saturation);
    	};

    	/**
    	 * Adjusts the brightness of pixel color by adding the specified value to the red, green and blue channels.
    	 * Positive values will make the image brighter, negative values will make it darker.
    	 * @method adjustBrightness
    	 * @param {Number} value A value between -255 & 255 that will be added to the RGB channels.
    	 * @return {ColorMatrix} The ColorMatrix instance the method is called on (useful for chaining calls.)
    	 **/
    	p.adjustBrightness = function(value) {
    		if (value == 0 || isNaN(value)) { return this; }
    		value = this._cleanValue(value,255);
    		this._multiplyMatrix([
    			1,0,0,0,value,
    			0,1,0,0,value,
    			0,0,1,0,value,
    			0,0,0,1,0,
    			0,0,0,0,1
    		]);
    		return this;
    	};

    	/**
    	 * Adjusts the contrast of pixel color.
    	 * Positive values will increase contrast, negative values will decrease contrast.
    	 * @method adjustContrast
    	 * @param {Number} value A value between -100 & 100.
    	 * @return {ColorMatrix} The ColorMatrix instance the method is called on (useful for chaining calls.)
    	 **/
    	p.adjustContrast = function(value) {
    		if (value == 0 || isNaN(value)) { return this; }
    		value = this._cleanValue(value,100);
    		var x;
    		if (value<0) {
    			x = 127+value/100*127;
    		} else {
    			x = value%1;
    			if (x == 0) {
    				x = ColorMatrix.DELTA_INDEX[value];
    			} else {
    				x = ColorMatrix.DELTA_INDEX[(value<<0)]*(1-x)+ColorMatrix.DELTA_INDEX[(value<<0)+1]*x; // use linear interpolation for more granularity.
    			}
    			x = x*127+127;
    		}
    		this._multiplyMatrix([
    			x/127,0,0,0,0.5*(127-x),
    			0,x/127,0,0,0.5*(127-x),
    			0,0,x/127,0,0.5*(127-x),
    			0,0,0,1,0,
    			0,0,0,0,1
    		]);
    		return this;
    	};

    	/**
    	 * Adjusts the color saturation of the pixel.
    	 * Positive values will increase saturation, negative values will decrease saturation (trend towards greyscale).
    	 * @method adjustSaturation
    	 * @param {Number} value A value between -100 & 100.
    	 * @return {ColorMatrix} The ColorMatrix instance the method is called on (useful for chaining calls.)
    	 **/
    	p.adjustSaturation = function(value) {
    		if (value == 0 || isNaN(value)) { return this; }
    		value = this._cleanValue(value,100);
    		var x = 1+((value > 0) ? 3*value/100 : value/100);
    		var lumR = 0.3086;
    		var lumG = 0.6094;
    		var lumB = 0.0820;
    		this._multiplyMatrix([
    			lumR*(1-x)+x,lumG*(1-x),lumB*(1-x),0,0,
    			lumR*(1-x),lumG*(1-x)+x,lumB*(1-x),0,0,
    			lumR*(1-x),lumG*(1-x),lumB*(1-x)+x,0,0,
    			0,0,0,1,0,
    			0,0,0,0,1
    		]);
    		return this;
    	};

    	/**
    	 * Adjusts the hue of the pixel color.
    	 * @method adjustHue
    	 * @param {Number} value A value between -180 & 180.
    	 * @return {ColorMatrix} The ColorMatrix instance the method is called on (useful for chaining calls.)
    	 **/
    	p.adjustHue = function(value) {
    		if (value == 0 || isNaN(value)) { return this; }
    		value = this._cleanValue(value,180)/180*Math.PI;
    		var cosVal = Math.cos(value);
    		var sinVal = Math.sin(value);
    		var lumR = 0.213;
    		var lumG = 0.715;
    		var lumB = 0.072;
    		this._multiplyMatrix([
    			lumR+cosVal*(1-lumR)+sinVal*(-lumR),lumG+cosVal*(-lumG)+sinVal*(-lumG),lumB+cosVal*(-lumB)+sinVal*(1-lumB),0,0,
    			lumR+cosVal*(-lumR)+sinVal*(0.143),lumG+cosVal*(1-lumG)+sinVal*(0.140),lumB+cosVal*(-lumB)+sinVal*(-0.283),0,0,
    			lumR+cosVal*(-lumR)+sinVal*(-(1-lumR)),lumG+cosVal*(-lumG)+sinVal*(lumG),lumB+cosVal*(1-lumB)+sinVal*(lumB),0,0,
    			0,0,0,1,0,
    			0,0,0,0,1
    		]);
    		return this;
    	};

    	/**
    	 * Concatenates (multiplies) the specified matrix with this one.
    	 * @method concat
    	 * @param {Array} matrix An array or ColorMatrix instance.
    	 * @return {ColorMatrix} The ColorMatrix instance the method is called on (useful for chaining calls.)
    	 **/
    	p.concat = function(matrix) {
    		matrix = this._fixMatrix(matrix);
    		if (matrix.length != ColorMatrix.LENGTH) { return this; }
    		this._multiplyMatrix(matrix);
    		return this;
    	};

    	/**
    	 * Returns a clone of this ColorMatrix.
    	 * @method clone
    	 * @return {ColorMatrix} A clone of this ColorMatrix.
    	 **/
    	p.clone = function() {
    		return (new ColorMatrix()).copyMatrix(this);
    	};

    	/**
    	 * Return a length 25 (5x5) array instance containing this matrix's values.
    	 * @method toArray
    	 * @return {Array} An array holding this matrix's values.
    	 **/
    	p.toArray = function() {
    		var arr = [];
    		for (var i= 0, l=ColorMatrix.LENGTH; i<l; i++) {
    			arr[i] = this[i];
    		}
    		return arr;
    	};

    	/**
    	 * Copy the specified matrix's values to this matrix.
    	 * @method copyMatrix
    	 * @param {Array} matrix An array or ColorMatrix instance.
    	 * @return {ColorMatrix} The ColorMatrix instance the method is called on (useful for chaining calls.)
    	 **/
    	p.copyMatrix = function(matrix) {
    		var l = ColorMatrix.LENGTH;
    		for (var i=0;i<l;i++) {
    			this[i] = matrix[i];
    		}
    		return this;
    	};

    	/**
    	 * Returns a string representation of this object.
    	 * @method toString
    	 * @return {String} a string representation of the instance.
    	 **/
    	p.toString = function() {
    		return "[ColorMatrix]";
    	};

    // private methods:

    	/**
    	 * @method _multiplyMatrix
    	 * @param {Array} matrix
    	 * @protected
    	 **/
    	p._multiplyMatrix = function(matrix) {
    		var col = [];

    		for (var i=0;i<5;i++) {
    			for (var j=0;j<5;j++) {
    				col[j] = this[j+i*5];
    			}
    			for (var j=0;j<5;j++) {
    				var val=0;
    				for (var k=0;k<5;k++) {
    					val += matrix[j+k*5]*col[k];
    				}
    				this[j+i*5] = val;
    			}
    		}
    	};

    	/**
    	 * Make sure values are within the specified range, hue has a limit of 180, brightness is 255, others are 100.
    	 * @method _cleanValue
    	 * @param {Number} value The raw number
    	 * @param {Number} limit The maximum that the number can be. The minimum is the limit * -1.
    	 * @protected
    	 **/
    	p._cleanValue = function(value, limit) {
    		return Math.min(limit,Math.max(-limit,value));
    	};

    	//
    	/**
    	 * Makes sure matrixes are 5x5 (25 long).
    	 * @method _fixMatrix
    	 * @param {Array} matrix
    	 * @protected
    	 **/
    	p._fixMatrix = function(matrix) {
    		if (matrix instanceof ColorMatrix) { matrix = matrix.toArray(); }
    		if (matrix.length < ColorMatrix.LENGTH) {
    			matrix = matrix.slice(0,matrix.length).concat(ColorMatrix.IDENTITY_MATRIX.slice(matrix.length,ColorMatrix.LENGTH));
    		} else if (matrix.length > ColorMatrix.LENGTH) {
    			matrix = matrix.slice(0,ColorMatrix.LENGTH);
    		}
    		return matrix;
    	};

    	createjs.ColorMatrix = ColorMatrix;

    }());