/*
   * Pixastic Lib - Remove noise - v0.1.0
   * Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
   * MIT License [http://www.opensource.org/licenses/mit-license.php]
   */
  
  Pixastic.Actions.removenoise = {
          process : function(params) {
  
                  if (Pixastic.Client.hasCanvasImageData()) {
                          var data = Pixastic.prepareData(params);
  
                          var rect = params.options.rect;
                          var w = rect.width;
                          var h = rect.height;
  
                          var w4 = w*4;
                          var y = h;
                          do {
                                  var offsetY = (y-1)*w4;
  
                                  var nextY = (y == h) ? y - 1 : y;
                                  var prevY = (y == 1) ? 0 : y-2;
  
                                  var offsetYPrev = prevY*w*4;
                                  var offsetYNext = nextY*w*4;
  
                                  var x = w;
                                  do {
                                          var offset = offsetY + (x*4-4);
  
                                          var offsetPrev = offsetYPrev + ((x == 1) ? 0 : x-2) * 4;
                                          var offsetNext = offsetYNext + ((x == w) ? x-1 : x) * 4;
  
                                          var minR, maxR, minG, maxG, minB, maxB;
  
                                          minR = maxR = data[offsetPrev];
                                          var r1 = data[offset-4], r2 = data[offset+4], r3 = data[offsetNext];
                                          if (r1 < minR) minR = r1;
                                          if (r2 < minR) minR = r2;
                                          if (r3 < minR) minR = r3;
                                          if (r1 > maxR) maxR = r1;
                                          if (r2 > maxR) maxR = r2;
                                          if (r3 > maxR) maxR = r3;
  
                                          minG = maxG = data[offsetPrev+1];
                                          var g1 = data[offset-3], g2 = data[offset+5], g3 = data[offsetNext+1];
                                          if (g1 < minG) minG = g1;
                                          if (g2 < minG) minG = g2;
                                          if (g3 < minG) minG = g3;
                                          if (g1 > maxG) maxG = g1;
                                          if (g2 > maxG) maxG = g2;
                                          if (g3 > maxG) maxG = g3;
  
                                          minB = maxB = data[offsetPrev+2];
                                          var b1 = data[offset-2], b2 = data[offset+6], b3 = data[offsetNext+2];
                                          if (b1 < minB) minB = b1;
                                          if (b2 < minB) minB = b2;
                                          if (b3 < minB) minB = b3;
                                          if (b1 > maxB) maxB = b1;
                                          if (b2 > maxB) maxB = b2;
                                          if (b3 > maxB) maxB = b3;
  
                                          if (data[offset] > maxR) {
                                                  data[offset] = maxR;
                                          } else if (data[offset] < minR) {
                                                  data[offset] = minR;
                                          }
                                          if (data[offset+1] > maxG) {
                                                  data[offset+1] = maxG;
                                          } else if (data[offset+1] < minG) {
                                                  data[offset+1] = minG;
                                          }
                                          if (data[offset+2] > maxB) {
                                                  data[offset+2] = maxB;
                                          } else if (data[offset+2] < minB) {
                                                  data[offset+2] = minB;
                                          }
  
                                  } while (--x);
                          } while (--y);
  
                          return true;
                  }
          },
          checkSupport : function() {
                  return Pixastic.Client.hasCanvasImageData();
          }
  }