add_clip_rect (3) Linux Manual Page
NAME
add_clip_rect – Intersects a bitmap’s clipping rectangle with the given area. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
void add_clip_rect(BITMAP *bitmap, int x1, int y1, int x2, int y2);
DESCRIPTION
Sets the clipping rectangle of the specified bitmap as the intersection of its current clipping rectangle and the rectangle described by the four coordinates.
SEE ALSO
set_clip_rect(3), get_clip_rect(3), set_clip_state(3), get_clip_state(3)