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       XtAddExposureToRegion - merge exposure events into a region


       void XtAddExposureToRegion(XEvent *event, Region region);


       event     Specifies a pointer to the Expose or GraphicsExpose event.

       region    Specifies the region object (as defined in <X11/Xutil.h>).


       The XtAddExposureToRegion function computes the union of the rectangle
       defined by the exposure event and the specified region.  Then, it
       stores the results back in region.  If the event argument is not an
       Expose or GraphicsExpose event, XtAddExposureToRegion returns without
       an error and without modifying region.

       This function is used by the exposure compression mechanism (see
       Section 7.9.3).


       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

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