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

   1 /*
   2  * Pixastic Lib - Lighten 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.lighten = {
   8
   9         process : function(params) {
  10                 var amount = parseFloat(params.options.amount) || 0;
  11
  12                 if (Pixastic.Client.hasCanvasImageData()) {
  13                         var data = Pixastic.prepareData(params);
  14                         var rect = params.options.rect;
  15                         var w = rect.width;
  16                         var h = rect.height;
  17                         var w4 = w*4;
  18                         var y = h;
  19                         do {
  20                                 var offsetY = (y-1)*w4;
  21                                 var x = w;
  22                                 do {
  23                                         var offset = offsetY + (x-1)*4;
  24
  25                                         var r = data[offset];
  26                                         var g = data[offset+1];
  27                                         var b = data[offset+2];
  28
  29                                         r += r*amount;
  30                                         g += g*amount;
  31                                         b += b*amount;
  32
  33                                         if (r < 0 ) r = 0;
  34                                         if (g < 0 ) g = 0;
  35                                         if (b < 0 ) b = 0;
  36                                         if (r > 255 ) r = 255;
  37                                         if (g > 255 ) g = 255;
  38                                         if (b > 255 ) b = 255;
  39
  40                                         data[offset] = r;
  41                                         data[offset+1] = g;
  42                                         data[offset+2] = b;
  43
  44                                 } while (--x);
  45                         } while (--y);
  46                         return true;
  47
  48                 } else if (Pixastic.Client.isIE()) {
  49                         var img = params.image;
  50                         if (amount < 0) {
  51                                 img.style.filter += " light()";
  52                                 img.filters[img.filters.length-1].addAmbient(
  53                                         255,255,255,
  54                                         100 * -amount
  55                                 );
  56                         } else if (amount > 0) {
  57                                 img.style.filter += " light()";
  58                                 img.filters[img.filters.length-1].addAmbient(
  59                                         255,255,255,
  60                                         100
  61                                 );
  62                                 img.filters[img.filters.length-1].addAmbient(
  63                                         255,255,255,
  64                                         100 * amount
  65                                 );
  66                         }
  67                         return true;
  68                 }
  69         },
  70         checkSupport : function() {
  71                 return (Pixastic.Client.hasCanvasImageData() || Pixastic.Client.isIE());
  72         }
  73 }