js2/mwEmbed/libClipEdit/pixastic-lib/actions/solarize.js

   1 /*
   2  * Pixastic Lib - Solarize 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]
   5  */
   6
   7 Pixastic.Actions.solarize = {
   8
   9         process : function(params) {
  10                 var useAverage = !!params.options.average;
  11
  12                 if (Pixastic.Client.hasCanvasImageData()) {
  13                         var data = Pixastic.prepareData(params);
  14                         var rect = params.options.rect;
  15                         var w = rect.width;
  16                         var h = rect.height;
  17                         var w4 = w*4;
  18                         var y = h;
  19                         do {
  20                                 var offsetY = (y-1)*w4;
  21                                 var x = w;
  22                                 do {
  23                                         var offset = offsetY + (x-1)*4;
  24
  25                                         var r = data[offset];
  26                                         var g = data[offset+1];
  27                                         var b = data[offset+2];
  28
  29                                         if (r > 127) r = 255 - r;
  30                                         if (g > 127) g = 255 - g;
  31                                         if (b > 127) b = 255 - b;
  32
  33                                         data[offset] = r;
  34                                         data[offset+1] = g;
  35                                         data[offset+2] = b;
  36
  37                                 } while (--x);
  38                         } while (--y);
  39                         return true;
  40                 }
  41         },
  42         checkSupport : function() {
  43                 return (Pixastic.Client.hasCanvasImageData());
  44         }
  45 }