debian man page for fli_pal_dirty_to

fli_pal_dirty_from(3alleg4)					  Allegro manual				       fli_pal_dirty_from(3alleg4)

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

SYNOPSIS
       #include <allegro.h>

       extern int fli_pal_dirty_from;

       extern int fli_pal_dirty_to;

DESCRIPTION
       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_vari-
       ables(). 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_pal-
       ette(). Example:

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

SEE ALSO
       fli_palette(3alleg4), reset_fli_variables(3alleg4)

Allegro 							   version 4.4.2				       fli_pal_dirty_from(3alleg4)