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

   1 /*
   2  * Pixastic Lib - Emboss 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.emboss = {
   8         process : function(params) {
   9
  10                 var strength = parseFloat(params.options.strength)||1;
  11                 var greyLevel = typeof params.options.greyLevel != "undefined" ? parseInt(params.options.greyLevel) : 180;
  12                 var direction = params.options.direction||"topleft";
  13                 var blend = !!params.options.blend;
  14
  15                 var dirY = 0;
  16                 var dirX = 0;
  17
  18                 switch (direction) {
  19                         case "topleft":                 // top left
  20                                 dirY = -1;
  21                                 dirX = -1;
  22                                 break;
  23                         case "top":                     // top
  24                                 dirY = -1;
  25                                 dirX = 0;
  26                                 break;
  27                         case "topright":                        // top right
  28                                 dirY = -1;
  29                                 dirX = 1;
  30                                 break;
  31                         case "right":                   // right
  32                                 dirY = 0;
  33                                 dirX = 1;
  34                                 break;
  35                         case "bottomright":                     // bottom right
  36                                 dirY = 1;
  37                                 dirX = 1;
  38                                 break;
  39                         case "bottom":                  // bottom
  40                                 dirY = 1;
  41                                 dirX = 0;
  42                                 break;
  43                         case "bottomleft":                      // bottom left
  44                                 dirY = 1;
  45                                 dirX = -1;
  46                                 break;
  47                         case "left":                    // left
  48                                 dirY = 0;
  49                                 dirX = -1;
  50                                 break;
  51                 }
  52
  53                 if (Pixastic.Client.hasCanvasImageData()) {
  54                         var data = Pixastic.prepareData(params);
  55                         var dataCopy = Pixastic.prepareData(params, true)
  56
  57                         var invertAlpha = !!params.options.invertAlpha;
  58                         var rect = params.options.rect;
  59                         var w = rect.width;
  60                         var h = rect.height;
  61
  62                         var w4 = w*4;
  63                         var y = h;
  64                         do {
  65                                 var offsetY = (y-1)*w4;
  66
  67                                 var otherY = dirY;
  68                                 if (y + otherY < 1) otherY = 0;
  69                                 if (y + otherY > h) otherY = 0;
  70
  71                                 var offsetYOther = (y-1+otherY)*w*4;
  72
  73                                 var x = w;
  74                                 do {
  75                                                 var offset = offsetY + (x-1)*4;
  76
  77                                                 var otherX = dirX;
  78                                                 if (x + otherX < 1) otherX = 0;
  79                                                 if (x + otherX > w) otherX = 0;
  80
  81                                                 var offsetOther = offsetYOther + (x-1+otherX)*4;
  82
  83                                                 var dR = dataCopy[offset] - dataCopy[offsetOther];
  84                                                 var dG = dataCopy[offset+1] - dataCopy[offsetOther+1];
  85                                                 var dB = dataCopy[offset+2] - dataCopy[offsetOther+2];
  86
  87                                                 var dif = dR;
  88                                                 var absDif = dif > 0 ? dif : -dif;
  89
  90                                                 var absG = dG > 0 ? dG : -dG;
  91                                                 var absB = dB > 0 ? dB : -dB;
  92
  93                                                 if (absG > absDif) {
  94                                                         dif = dG;
  95                                                 }
  96                                                 if (absB > absDif) {
  97                                                         dif = dB;
  98                                                 }
  99
 100                                                 dif *= strength;
 101
 102                                                 if (blend) {
 103                                                         var r = data[offset] + dif;
 104                                                         var g = data[offset+1] + dif;
 105                                                         var b = data[offset+2] + dif;
 106
 107                                                         data[offset] = (r > 255) ? 255 : (r < 0 ? 0 : r);
 108                                                         data[offset+1] = (g > 255) ? 255 : (g < 0 ? 0 : g);
 109                                                         data[offset+2] = (b > 255) ? 255 : (b < 0 ? 0 : b);
 110                                                 } else {
 111                                                         var grey = greyLevel - dif;
 112                                                         if (grey < 0) {
 113                                                                 grey = 0;
 114                                                         } else if (grey > 255) {
 115                                                                 grey = 255;
 116                                                         }
 117
 118                                                         data[offset] = data[offset+1] = data[offset+2] = grey;
 119                                                 }
 120
 121                                 } while (--x);
 122                         } while (--y);
 123                         return true;
 124
 125                 } else if (Pixastic.Client.isIE()) {
 126                         params.image.style.filter += " progid:DXImageTransform.Microsoft.emboss()";
 127                         return true;
 128                 }
 129         },
 130         checkSupport : function() {
 131                 return (Pixastic.Client.hasCanvasImageData() || Pixastic.Client.isIE());
 132         }
 133
 134 }