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

   1 /*
   2  * Pixastic Lib - Color adjust 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.coloradjust = {
   8
   9         process : function(params) {
  10                 var red = parseFloat(params.options.red) || 0;
  11                 var green = parseFloat(params.options.green) || 0;
  12                 var blue = parseFloat(params.options.blue) || 0;
  13
  14                 red = Math.round(red*255);
  15                 green = Math.round(green*255);
  16                 blue = Math.round(blue*255);
  17
  18                 if (Pixastic.Client.hasCanvasImageData()) {
  19                         var data = Pixastic.prepareData(params);
  20                         var rect = params.options.rect;
  21                         var w = rect.width;
  22                         var h = rect.height;
  23                         var w4 = w*4;
  24                         var y = h;
  25                         do {
  26                                 var offsetY = (y-1)*w4;
  27                                 var x = w;
  28                                 do {
  29                                         var offset = offsetY + (x-1)*4;
  30
  31                                         var r = data[offset] + red;
  32                                         var g = data[offset+1] + green;
  33                                         var b = data[offset+2] + blue;
  34
  35                                         if (r < 0 ) r = 0;
  36                                         if (g < 0 ) g = 0;
  37                                         if (b < 0 ) b = 0;
  38                                         if (r > 255 ) r = 255;
  39                                         if (g > 255 ) g = 255;
  40                                         if (b > 255 ) b = 255;
  41
  42                                         data[offset] = r;
  43                                         data[offset+1] = g;
  44                                         data[offset+2] = b;
  45
  46                                 } while (--x);
  47                         } while (--y);
  48                         return true;
  49                 }
  50         },
  51         checkSupport : function() {
  52                 return (Pixastic.Client.hasCanvasImageData());
  53         }
  54 }