src/charactermanaj/graphics/filters/ContrastTableFactory.java

   1 package charactermanaj.graphics.filters;\r
   2 \r
   3 /**\r
   4  * コントラストの計算済みテーブルを用意する.<br>\r
   5  * 最大で255x3あれば足りる.<br>\r
   6  * \r
   7  * @author seraphy\r
   8  * \r
   9  */\r
  10 public class ContrastTableFactory implements TableFactory {\r
  11 \r
  12         private float contrast = 1.f;\r
  13         \r
  14         public ContrastTableFactory() {\r
  15                 this(1.f);\r
  16         }\r
  17         \r
  18         public ContrastTableFactory(float contrast) {\r
  19                 this.contrast = contrast;\r
  20         }\r
  21         \r
  22         public int[][] createTable() {\r
  23                 int[] table = new int[256];\r
  24                 for (int level = 0; level <= 255; level++) {\r
  25                         float f = level / 255.f;\r
  26                         f = getContrast(f);\r
  27                         int c = (int)(f * 256);\r
  28                         if (c > 255) {\r
  29                                 c = 255;\r
  30                         } else if (c < 0) {\r
  31                                 c = 0;\r
  32                         }\r
  33                         table[level] = c;\r
  34                 }\r
  35 \r
  36                 int[][] tables = new int[3][];\r
  37                 for (int idx = 0; idx < 3; idx++) {\r
  38                         tables[idx] = table;\r
  39                 }\r
  40                 return tables;\r
  41         }\r
  42         \r
  43         protected float getContrast(float f) {\r
  44                 return (f - 0.5f) * contrast + 0.5f;\r
  45         }\r
  46         \r
  47 }\r