/*
   * Pixastic Lib - Color adjust filter - v0.1.1
   * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
   * MIT License [http://www.opensource.org/licenses/mit-license.php]
   */
  
  Pixastic.Actions.coloradjust = {
  
          process : function(params) {
                  var red = parseFloat(params.options.red) || 0;
                  var green = parseFloat(params.options.green) || 0;
                  var blue = parseFloat(params.options.blue) || 0;
  
                  red = Math.round(red*255);
                  green = Math.round(green*255);
                  blue = Math.round(blue*255);
  
                  if (Pixastic.Client.hasCanvasImageData()) {
                          var data = Pixastic.prepareData(params);
                          var rect = params.options.rect;
  
                          var p = rect.width*rect.height;
                          var pix = p*4, pix1, pix2;
  
                          var r, g, b;
                          while (p--) {
                                  pix -= 4;
  
                                  if (red) {
                                          if ((r = data[pix] + red) < 0 ) 
                                                  data[pix] = 0;
                                          else if (r > 255 ) 
                                                  data[pix] = 255;
                                          else
                                                  data[pix] = r;
                                  }
  
                                  if (green) {
                                          if ((g = data[pix1=pix+1] + green) < 0 ) 
                                                  data[pix1] = 0;
                                          else if (g > 255 ) 
                                                  data[pix1] = 255;
                                          else
                                                  data[pix1] = g;
                                  }
  
                                  if (blue) {
                                          if ((b = data[pix2=pix+2] + blue) < 0 ) 
                                                  data[pix2] = 0;
                                          else if (b > 255 ) 
                                                  data[pix2] = 255;
                                          else
                                                  data[pix2] = b;
                                  }
                          }
                          return true;
                  }
          },
          checkSupport : function() {
                  return (Pixastic.Client.hasCanvasImageData());
          }
  }