add_clip_rect - Man Page

#include <allegro.h>

void add_clip_rect(BITMAP *bitmap, int x1, int y1, int x2, int y2);

Sets the clipping rectangle of the specified bitmap as the intersection of its current clipping rectangle and the rectangle described by the four coordinates.

set_clip_rect(3), get_clip_rect(3), set_clip_state(3), get_clip_state(3)

get_clip_rect(3), get_clip_state(3), set_clip_rect(3), set_clip_state(3).