is_inside_bitmap(3) - Linux man page
Name
is_inside_bitmap - Tells if a point is inside a bitmap. Allegro game programming library.
Synopsis
#include <allegro.h>
int is_inside_bitmap(BITMAP *bmp, int x, int y, int clip);
Description
Returns non-zero if point (x, y) lies inside the bitmap. If 'clip' is non-zero, the function
compares the coordinates with the clipping rectangle, that is it returns non-zero if the point lies inside the clipping rectangle or if clipping is disabled
for the bitmap. If 'clip' is zero, the function compares the coordinates with the actual dimensions of the bitmap.
See Also
set_clip_rect(3), set_clip_state(3), getpixel(3)