1create_color_table(3)           Allegro manual           create_color_table(3)
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NAME

6       create_color_table  -  Fills  a  color  mapping  table  for  customised
7       effects. Allegro game programming library.
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SYNOPSIS

10       #include <allegro.h>
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13       void  create_color_table(COLOR_MAP  *table,  const  PALETTE  pal,  void
14       (*blend)(PALETTE  pal,  int  x,  int y, RGB *rgb), void (*callback)(int
15       pos));
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DESCRIPTION

18       Fills the specified color mapping table with lookup data for doing cus‐
19       tomised  effects with the specified palette, calling the blend function
20       to determine the results of each color combination.
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22       Your blend routine will be passed a pointer to the palette and the  two
23       indices  of the colors which are to be combined, and should fill in the
24       RGB structure with the desired result in 0-63 format. Allegro will then
25       search  the  palette  for  the  closest match to the RGB color that you
26       requested, so it doesn't matter if the palette has no exact  match  for
27       this color.
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29       If  the callback function is not NULL, it will be called 256 times dur‐
30       ing the calculation, allowing you  to  display  a  progress  indicator.
31       Example:
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33          COLOR_MAP greyscale_table;
34          ...
35          void return_grey_color(const PALETTE pal,
36                                 int x, int y, RGB *rgb)
37          {
38             ...
39          }
40          ...
41             /* Build a color lookup table for greyscale effect. */
42             create_color_table(&greyscale_table, pal,
43                                return_grey_color, NULL);
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SEE ALSO

47       color_map(3),    create_light_table(3),   create_trans_table(3),   cre‐
48       ate_blender_table(3),     draw_trans_sprite(3),     draw_lit_sprite(3),
49       draw_gouraud_sprite(3), rgb_map(3), excolmap(3)
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53Allegro                          version 4.2.2           create_color_table(3)
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