chrome/test/data/third_party/kraken/tests/kraken-1.1/imaging-desaturate.js

   1 /*
   2  * Pixastic Lib - Desaturation filter - v0.1.1
   3  * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
   4  * License: [http://www.pixastic.com/lib/license.txt] (MPL 1.1)
   5  */
   6
   7 var Pixastic = {};
   8 Pixastic.Actions = {};
   9 Pixastic.Actions.desaturate = {
  10     process : function(params) {
  11         var useAverage = !!(params.options.average && params.options.average != "false");
  12         var data = params.data;
  13         var rect = params.options.rect;
  14         var w = rect.width;
  15         var h = rect.height;
  16
  17         var p = w*h;
  18         var pix = p*4, pix1, pix2;
  19
  20         if (useAverage) {
  21             while (p--)
  22                 data[pix-=4] = data[pix1=pix+1] = data[pix2=pix+2] = (data[pix]+data[pix1]+data[pix2])/3
  23         } else {
  24             while (p--)
  25                 data[pix-=4] = data[pix1=pix+1] = data[pix2=pix+2] = (data[pix]*0.3 + data[pix1]*0.59 + data[pix2]*0.11);
  26         }
  27         return true;
  28     }
  29 }
  30
  31 var params = {
  32     options: {
  33         rect: { width: width, height: height},
  34     },
  35     data: squidImageData
  36 }
  37
  38 //XXX improve dataset rather than loop
  39 for (var pixcounter = 0; pixcounter < 200; pixcounter++)
  40     Pixastic.Actions.desaturate.process(params);