man is_screen_bitmap (3): Tells if a bitmap is the screen bitmap or sub bitmap. Allegro game programming library.

is_screen_bitmap(3) Tells if a bitmap is the screen bitmap or sub bitmap. Allegro game programming library.

SYNOPSIS

#include <allegro.h>

int is_screen_bitmap(BITMAP *bmp);

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