fli_pal_dirty_from (3) - Linux Manuals

fli_pal_dirty_from: Indicate which parts of the palette have changed. Allegro game programming library.

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_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);