topical media & game development
mobile-graphic-easel-src-easeljs-filters-ColorMatrixFilter.js / 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.
*/
// namespace:
this.createjs = this.createjs||{};
(function() {
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.
See {{#crossLink "Filter"}}{{/crossLink}} for an example of how to apply filters.
@class ColorMatrixFilter
@constructor
@extends Filter
parameter: {Array} matrix A 4x5 matrix describing the color operation to perform. See also the ColorMatrix 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
parameter: {Array} matrix A 4x5 matrix describing the color operation to perform.
p.initialize = function(matrix) {
this.matrix = matrix;
}
// public methods:
Applies the filter to the specified context.
@method applyFilter
parameter: {CanvasRenderingContext2D} ctx The 2D context to use as the source.
parameter: {Number} x The x position to use for the source rect.
parameter: {Number} y The y position to use for the source rect.
parameter: {Number} width The width to use for the source rect.
parameter: {Number} height The height to use for the source rect.
parameter: {CanvasRenderingContext2D} targetCtx Optional. The 2D context to draw the result to. Defaults to the context passed to ctx.
parameter: {Number} targetX Optional. The x position to draw the result to. Defaults to the value passed to x.
parameter: {Number} targetY Optional. The y position to draw the result to. Defaults to the value passed to y.
returns: {Boolean}
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
}
imageData.data = data;
targetCtx.putImageData(imageData, targetX, targetY);
return true;
}
Returns a string representation of this object.
@method toString
returns: {String} a string representation of the instance.
p.toString = function() {
return "[ColorMatrixFilter]";
}
Returns a clone of this ColorMatrixFilter instance.
@method clone
returns: {ColorMatrixFilter} A clone of the current ColorMatrixFilter instance.
p.clone = function() {
return new ColorMatrixFilter(this.matrix);
}
createjs.ColorMatrixFilter = ColorMatrixFilter;
}());
(C) Æliens
04/09/2009
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