fli_pal_dirty_from - Man Page

#include <allegro.h>

extern int fli_pal_dirty_from;

extern int fli_pal_dirty_to;

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_palette(3), reset_fli_variables(3)

fli_palette(3), reset_fli_variables(3).

The man page fli_pal_dirty_to(3) is an alias of fli_pal_dirty_from(3).