xfree86 man page for xcreateregion

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

NAME
       XCreateRegion, XSetRegion, XDestroyRegion - create or destroy regions

SYNTAX
       Region XCreateRegion(void);

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

       int XDestroyRegion(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

XFree86 							   Version 4.7.0					       XCreateRegion(3X11)