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XtAddExposureToRegion - merge exposure
events into a region 
- void XtAddExposureToRegion(XEvent *event, Region
region);  
Specifies a pointer to the Expose   or GraphicsExpose
  event. 
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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