topical media & game development
mobile-query-three-plugins-assets-vendor-pixastic-actions-invert.js / js
/*
* Pixastic Lib - Invert filter - v0.1.1
* Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
* License: [http://www.pixastic.com/lib/license.txt]
*/
Pixastic.Actions.invert = {
process : function(params) {
if (Pixastic.Client.hasCanvasImageData()) {
var data = Pixastic.prepareData(params);
var invertAlpha = !!params.options.invertAlpha;
var rect = params.options.rect;
var p = rect.width * rect.height;
var pix = p*4, pix1 = pix + 1, pix2 = pix + 2, pix3 = pix + 3;
while (p--) {
data[pix-=4] = 255 - data[pix];
data[pix1-=4] = 255 - data[pix1];
data[pix2-=4] = 255 - data[pix2];
if (invertAlpha)
data[pix3-=4] = 255 - data[pix3];
}
return true;
} else if (Pixastic.Client.isIE()) {
params.image.style.filter += " invert";
return true;
}
},
checkSupport : function() {
return (Pixastic.Client.hasCanvasImageData() || Pixastic.Client.isIE());
}
}
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.