2 * Pixastic Lib - Invert filter - v0.1.0
3 * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
4 * MIT License [http://www.opensource.org/licenses/mit-license.php]
7 Pixastic.Actions.invert = {
8 process : function(params) {
9 if (Pixastic.Client.hasCanvasImageData()) {
10 var data = Pixastic.prepareData(params);
12 var invertAlpha = !!params.options.invertAlpha;
13 var rect = params.options.rect;
20 var offsetY = (y-1)*w4;
23 var offset = offsetY + (x-1)*4;
24 data[offset] = 255 - data[offset];
25 data[offset+1] = 255 - data[offset+1];
26 data[offset+2] = 255 - data[offset+2];
27 if (invertAlpha) data[offset+3] = 255 - data[offset+3];
31 } else if (Pixastic.Client.isIE()) {
32 params.image.style.filter += " invert";
36 checkSupport : function() {
37 return (Pixastic.Client.hasCanvasImageData() || Pixastic.Client.isIE());