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     X Version 11 (1 September 1988)    XtAddExposureToRegion(Xt)



     NAME
          XtAddExposureToRegion - merge exposure events into a region


     SYNTAX
          void XtAddExposureToRegion(event, region)
               XEvent *event;
               Region region;


     ARGUMENTS
          event     Specifies a pointer to the Expose or
                    GraphicsExpose event.

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


     DESCRIPTION
          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).


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


     (printed 2/14/90) (1 September 1988)tAddExposureToRegion(Xt)