File: src\effects\class.effect.invertcolors.js
/*
* Copyright (c) 2014 Gwennael Buchet
*
* License/Terms of Use
*
* Permission is hereby granted, free of charge and for the term of intellectual property rights on the Software, to any
* person obtaining a copy of this software and associated documentation files (the "Software"), to use, copy, modify
* and propagate free of charge, anywhere in the world, all or part of the Software subject to the following mandatory conditions:
*
* • The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* Any failure to comply with the above shall automatically terminate the license and be construed as a breach of these
* Terms of Use causing significant harm to Gwennael Buchet.
*
* 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 NON INFRINGEMENT. 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.
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* the use or other dealings in this Software without prior written authorization from Gwennael Buchet.
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* These Terms of Use are subject to French law.
*/
/*
* Effect to be applied to a CGSGImage or a CGSGAnimatedSprite.
* @class CGSGEffectInvertColors
* @module Effect
* @extends CGSGEffect
* @constructor
* @beta
* @type {CGSGEffectInvertColors}
*/
var CGSGEffectInvertColors = CGSGEffect.extend(
{
initialize : function() {
this._super();
},
/**
* This function must be filled by the inherited classes.
* @method render
* @param {CanvasRenderingContext2D} context context containing the image
* @param {Number} width width for the image to be modified
* @param {Number} height height for the image to be modified
*/
render : function(context, width, height) {
try {
var imageData = context.getImageData(0, 0, width, height);
var data = imageData.data;
for (var i = 0 ; i < data.length ; i += 4) {
data[i] = 255 - data[i]; // red
data[i + 1] = 255 - data[i + 1]; // green
data[i + 2] = 255 - data[i + 2]; // blue
// i+3 = alpha
}
// overwrite original image
context.putImageData(imageData, 0, 0);
}
catch (err) {
//the image is not on the same domain or not on a server
}
}
}
);