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CentOS 7.0 - man page for xcreateregion (centos section 3)

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XCreateRegion(3)			  XLIB FUNCTIONS			 XCreateRegion(3)

       XCreateRegion, XSetRegion, XDestroyRegion - create or destroy regions

       Region XCreateRegion(void);

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

       int XDestroyRegion(Region r);

       display	 Specifies the connection to the X server.

       gc	 Specifies the GC.

       r	 Specifies the region.

       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 implemen-
       tation-dependent.  Once it is set in the GC, the region can be destroyed.

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

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

X Version 11				   libX11 1.6.0 			 XCreateRegion(3)
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