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

   1 /*
   2  * Pixastic Lib - Remove noise - 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.removenoise = {
   8         process : function(params) {
   9
  10                 if (Pixastic.Client.hasCanvasImageData()) {
  11                         var data = Pixastic.prepareData(params);
  12
  13                         var rect = params.options.rect;
  14                         var w = rect.width;
  15                         var h = rect.height;
  16
  17                         var w4 = w*4;
  18                         var y = h;
  19                         do {
  20                                 var offsetY = (y-1)*w4;
  21
  22                                 var nextY = (y == h) ? y - 1 : y;
  23                                 var prevY = (y == 1) ? 0 : y-2;
  24
  25                                 var offsetYPrev = prevY*w*4;
  26                                 var offsetYNext = nextY*w*4;
  27
  28                                 var x = w;
  29                                 do {
  30                                         var offset = offsetY + (x*4-4);
  31
  32                                         var offsetPrev = offsetYPrev + ((x == 1) ? 0 : x-2) * 4;
  33                                         var offsetNext = offsetYNext + ((x == w) ? x-1 : x) * 4;
  34
  35                                         var minR, maxR, minG, maxG, minB, maxB;
  36
  37                                         minR = maxR = data[offsetPrev];
  38                                         var r1 = data[offset-4], r2 = data[offset+4], r3 = data[offsetNext];
  39                                         if (r1 < minR) minR = r1;
  40                                         if (r2 < minR) minR = r2;
  41                                         if (r3 < minR) minR = r3;
  42                                         if (r1 > maxR) maxR = r1;
  43                                         if (r2 > maxR) maxR = r2;
  44                                         if (r3 > maxR) maxR = r3;
  45
  46                                         minG = maxG = data[offsetPrev+1];
  47                                         var g1 = data[offset-3], g2 = data[offset+5], g3 = data[offsetNext+1];
  48                                         if (g1 < minG) minG = g1;
  49                                         if (g2 < minG) minG = g2;
  50                                         if (g3 < minG) minG = g3;
  51                                         if (g1 > maxG) maxG = g1;
  52                                         if (g2 > maxG) maxG = g2;
  53                                         if (g3 > maxG) maxG = g3;
  54
  55                                         minB = maxB = data[offsetPrev+2];
  56                                         var b1 = data[offset-2], b2 = data[offset+6], b3 = data[offsetNext+2];
  57                                         if (b1 < minB) minB = b1;
  58                                         if (b2 < minB) minB = b2;
  59                                         if (b3 < minB) minB = b3;
  60                                         if (b1 > maxB) maxB = b1;
  61                                         if (b2 > maxB) maxB = b2;
  62                                         if (b3 > maxB) maxB = b3;
  63
  64                                         if (data[offset] > maxR) {
  65                                                 data[offset] = maxR;
  66                                         } else if (data[offset] < minR) {
  67                                                 data[offset] = minR;
  68                                         }
  69                                         if (data[offset+1] > maxG) {
  70                                                 data[offset+1] = maxG;
  71                                         } else if (data[offset+1] < minG) {
  72                                                 data[offset+1] = minG;
  73                                         }
  74                                         if (data[offset+2] > maxB) {
  75                                                 data[offset+2] = maxB;
  76                                         } else if (data[offset+2] < minB) {
  77                                                 data[offset+2] = minB;
  78                                         }
  79
  80                                 } while (--x);
  81                         } while (--y);
  82
  83                         return true;
  84                 }
  85         },
  86         checkSupport : function() {
  87                 return Pixastic.Client.hasCanvasImageData();
  88         }
  89 }