_SET_COLOR - reference manual online

_set_color(3alleg4)                       Allegro manual                      _set_color(3alleg4)

NAME
       _set_color - Inline version of set_color(). Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       void _set_color(int index, const RGB *p);

DESCRIPTION
       This is an inline version of set_color(), intended for use in the vertical retrace simula‐
       tor callback function (retrace_proc, which is now deprecated).

       If you really must use _set_color from retrace_proc, note that it should only be used
       under DOS, in VGA mode 13h and mode-X. Some SVGA chipsets aren't VGA compatible
       (set_color() and set_palette() will use VESA calls on these cards, but _set_color()
       doesn't know about that).

SEE ALSO
       set_color(3alleg4), set_gfx_mode(3alleg4), ex3buf(3alleg4)

Allegro                                   version 4.4.2                       _set_color(3alleg4)