is_screen_bitmap - Tells if a bitmap is the screen bitmap or sub bitmap. Allegro game programming

       Returns TRUE if bmp is the screen bitmap, or a sub-bitmap of the screen.

       is_screen_bitmap  -  Tells  if  a  bitmap  is  the  screen bitmap or sub bitmap. Allegro game programming
       library.

screen(3alleg4), create_sub_bitmap(3alleg4)

Allegro                                           version 4.4.3                        is_screen_bitmap(3alleg4)

#include<allegro.h>intis_screen_bitmap(BITMAP*bmp);