#

API Documentation for: NEXT
Show: Inherited Protected Private Deprecated

# File:ColorFilter.js

    /*
    * ColorFilter
    * 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";

    /**
     * Applies a color transform to DisplayObjects.
     *
     * <h4>Example</h4>
     * This example draws a red circle, and then transforms it to Blue. This is accomplished by multiplying all the channels
     * to 0 (except alpha, which is set to 1), and then adding 255 to the blue channel.
     *
     *      var shape = new createjs.Shape().set({x:100,y:100});
     *      shape.graphics.beginFill("#ff0000").drawCircle(0,0,50);
     *
     *      shape.filters = [
     *          new createjs.ColorFilter(0,0,0,1, 0,0,255,0)
     *      ];
     *      shape.cache(-50, -50, 100, 100);
     *
     * See {{#crossLink "Filter"}}{{/crossLink}} for an more information on applying filters.
     * @class ColorFilter
     * @param {Number} [redMultiplier=1] The amount to multiply against the red channel. This is a range between 0 and 1.
     * @param {Number} [greenMultiplier=1] The amount to multiply against the green channel. This is a range between 0 and 1.
     * @param {Number} [blueMultiplier=1] The amount to multiply against the blue channel. This is a range between 0 and 1.
     * @param {Number} [alphaMultiplier=1] The amount to multiply against the alpha channel. This is a range between 0 and 1.
     * @param {Number} [redOffset=0] The amount to add to the red channel after it has been multiplied. This is a range
     * between -255 and 255.
     * @param {Number} [greenOffset=0] The amount to add to the green channel after it has been multiplied. This is a range
      * between -255 and 255.
     * @param {Number} [blueOffset=0] The amount to add to the blue channel after it has been multiplied. This is a range
      * between -255 and 255.
     * @param {Number} [alphaOffset=0] The amount to add to the alpha channel after it has been multiplied. This is a range
      * between -255 and 255.
     * @constructor
     * @extends Filter
     **/
    var ColorFilter = function(redMultiplier, greenMultiplier, blueMultiplier, alphaMultiplier, redOffset, greenOffset, blueOffset, alphaOffset) {
      this.initialize(redMultiplier, greenMultiplier, blueMultiplier, alphaMultiplier, redOffset, greenOffset, blueOffset, alphaOffset);
    }
    var p = ColorFilter.prototype = new createjs.Filter();

    // public properties:
    	/**
    	 * Red channel multiplier.
    	 * @property redMultiplier
    	 * @type Number
    	 **/
    	p.redMultiplier = 1;

    	/**
    	 * Green channel multiplier.
    	 * @property greenMultiplier
    	 * @type Number
    	 **/
    	p.greenMultiplier = 1;

    	/**
    	 * Blue channel multiplier.
    	 * @property blueMultiplier
    	 * @type Number
    	 **/
    	p.blueMultiplier = 1;

    	/**
    	 * Alpha channel multiplier.
    	 * @property alphaMultiplier
    	 * @type Number
    	 **/
    	p.alphaMultiplier = 1;

    	/**
    	 * Red channel offset (added to value).
    	 * @property redOffset
    	 * @type Number
    	 **/
    	p.redOffset = 0;

    	/**
    	 * Green channel offset (added to value).
    	 * @property greenOffset
    	 * @type Number
    	 **/
    	p.greenOffset = 0;

    	/**
    	 * Blue channel offset (added to value).
    	 * @property blueOffset
    	 * @type Number
    	 **/
    	p.blueOffset = 0;

    	/**
    	 * Alpha channel offset (added to value).
    	 * @property alphaOffset
    	 * @type Number
    	 **/
    	p.alphaOffset = 0;

    // constructor:
    	/**
    	 * Initialization method.
    	 * @method initialize
    	 * @param {Number} [redMultiplier=1] The amount to multiply against the red channel. This is a range between 0 and 1.
    	 * @param {Number} [greenMultiplier=1] The amount to multiply against the green channel. This is a range between 0 and 1.
    	 * @param {Number} [blueMultiplier=1] The amount to multiply against the blue channel. This is a range between 0 and 1.
    	 * @param {Number} [alphaMultiplier=1] The amount to multiply against the alpha channel. This is a range between 0 and 1.
    	 * @param {Number} [redOffset=0] The amount to add to the red channel after it has been multiplied. This is a range
    	 * between -255 and 255.
    	 * @param {Number} [greenOffset=0] The amount to add to the green channel after it has been multiplied. This is a range
    	 * between -255 and 255.
    	 * @param {Number} [blueOffset=0] The amount to add to the blue channel after it has been multiplied. This is a range
    	 * between -255 and 255.
    	 * @param {Number} [alphaOffset=0] The amount to add to the alpha channel after it has been multiplied. This is a range
    	 * between -255 and 255.
    	 * @protected
    	 **/
    	p.initialize = function(redMultiplier, greenMultiplier, blueMultiplier, alphaMultiplier, redOffset, greenOffset, blueOffset, alphaOffset) {
    		this.redMultiplier = redMultiplier != null ? redMultiplier : 1;
    		this.greenMultiplier = greenMultiplier != null ? greenMultiplier : 1;
    		this.blueMultiplier = blueMultiplier != null ? blueMultiplier : 1;
    		this.alphaMultiplier = alphaMultiplier != null ? alphaMultiplier : 1;
    		this.redOffset = redOffset || 0;
    		this.greenOffset = greenOffset || 0;
    		this.blueOffset = blueOffset || 0;
    		this.alphaOffset = alphaOffset || 0;
    	}

    // 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;
    		for (var i=0; i<l; i+=4) {
    			data[i] = data[i]*this.redMultiplier+this.redOffset;
    			data[i+1] = data[i+1]*this.greenMultiplier+this.greenOffset;
    			data[i+2] = data[i+2]*this.blueMultiplier+this.blueOffset;
    			data[i+3] = data[i+3]*this.alphaMultiplier+this.alphaOffset;
    		}
    		targetCtx.putImageData(imageData, targetX, targetY);
    		return true;
    	}

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

    	/**
    	 * Returns a clone of this ColorFilter instance.
    	 * @method clone
    	 * @return {ColorFilter} A clone of the current ColorFilter instance.
    	 **/
    	p.clone = function() {
    		return new ColorFilter(this.redMultiplier, this.greenMultiplier, this.blueMultiplier, this.alphaMultiplier, this.redOffset, this.greenOffset, this.blueOffset, this.alphaOffset);
    	}

    	createjs.ColorFilter = ColorFilter;

    }());