fli_pal_dirty_from, fli_pal_dirty_to - Indicate which parts of the palette have changed. Allegro game

       These variables are set by next_fli_frame() to indicate which part of the fli_palette has  changed  since
       the  last  call  to  reset_fli_variables().  If  fli_pal_dirty_from is greater than fli_pal_dirty_to, the
       palette has not  changed,  otherwise  colors  fli_pal_dirty_from  to  fli_pal_dirty_to  (inclusive)  have
       altered.  You  can  use  these  when  updating  the  hardware  palette,  to  avoid  unnecessary  calls to
       set_palette(). Example:

          if (fli_pal_dirty_from <= fli_pal_dirty_to)
             set_palette_range(fli_palette, fli_pal_dirty_from,
                               fli_pal_dirty_to, 1);

       fli_pal_dirty_from,  fli_pal_dirty_to  -  Indicate  which parts of the palette have changed. Allegro game
       programming library.

fli_palette(3alleg4), reset_fli_variables(3alleg4)

Allegro                                           version 4.4.3                      fli_pal_dirty_from(3alleg4)

#include<allegro.h>externintfli_pal_dirty_from;externintfli_pal_dirty_to;