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makeacol(3)                     Allegro manual                     makeacol(3)

NAME
       makeacol, makeacol_depth - Converts RGBA colors into display dependent
       pixel formats. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       int makeacol(int r, int g, int b, int a);

       int makeacol_depth(int color_depth, int r, int g, int b, int a);

DESCRIPTION
       Convert RGBA colors into display dependent pixel formats. In anything
       less than a 32-bit mode, these are the same as calling makecol() or
       makecol_depth(), but by using these routines it is possible to create
       32-bit color values that contain a true 8 bit alpha channel along with
       the red, green, and blue components. You should only use RGBA format
       colors as the input to draw_trans_sprite() or draw_trans_rle_sprite()
       after calling set_alpha_blender(), rather than drawing them directly to
       the screen.

RETURN VALUE
       Returns the requested RGBA quadruplet.

SEE ALSO
       makecol(3), makecol_depth(3), set_alpha_blender(3),
       set_write_alpha_blender(3), exrotscl(3)

Allegro                          version 4.4.2                     makeacol(3)