Provided by: allegro4-doc_4.4.3.1-1_all bug


       create_trans_table  -  Fills  a color mapping table for translucency effects. Allegro game
       programming library.


       #include <allegro.h>

       void  create_trans_table(COLOR_MAP  *table,  const  PALETTE  pal,  int  r,  g,   b,   void
       (*callback)(int pos));


       Fills  the  specified  color mapping table with lookup data for doing translucency effects
       with the specified palette. When combining the colors c1  and  c2  with  this  table,  the
       result  will  be a color somewhere between the two. The r, g, and b parameters specify the
       solidity of each color component, ranging from 0 (totally  transparent)  to  255  (totally
       solid). For 50% solidity, pass 128.

       This  function treats source color #0 as a special case, leaving the destination unchanged
       whenever a zero source pixel is encountered, so that masked sprites will  draw  correctly.
       This  function  will  take  advantage  of  the  global  rgb_map variable to speed up color
       conversions. If the callback function is not NULL, it will be called 256 times during  the
       calculation, allowing you to display a progress indicator. Example:

          COLOR_MAP trans_table;
          /* Build a color lookup table for translucent drawing. */
          create_trans_table(&trans_table, pal, 128, 128, 128, NULL);


       color_map(3alleg4),        create_light_table(3alleg4),       create_color_table(3alleg4),
       create_blender_table(3alleg4),    draw_trans_sprite(3alleg4),    draw_lit_sprite(3alleg4),
       draw_gouraud_sprite(3alleg4), rgb_map(3alleg4), ex3d(3alleg4), extrans(3alleg4)