redhat man page for xsetregion

XCreateRegion(3X11)						  XLIB FUNCTIONS					       XCreateRegion(3X11)

NAME
       XCreateRegion, XSetRegion, XDestroyRegion - create or destroy regions

SYNTAX
       Region XCreateRegion()

       XSetRegion(display, gc, r)
	     Display *display;
	     GC gc;
	     Region r;

       XDestroyRegion(r)
	     Region r;

ARGUMENTS
       display	 Specifies the connection to the X server.

       gc	 Specifies the GC.

       r	 Specifies the region.

DESCRIPTION
       The XCreateRegion function creates a new empty region.

       The XSetRegion function sets the clip-mask in the GC to the specified region.  The region is specified relative to the drawable's origin.
       The resulting GC clip origin is implementation-dependent.  Once it is set in the GC, the region can be destroyed.

       The XDestroyRegion function deallocates the storage associated with a specified region.

SEE ALSO
       XEmptyRegion(3X11), XIntersectRegion(3X11)
       Xlib - C Language X Interface

X Version 11							    Release 6.6 					       XCreateRegion(3X11)