() — MultiPersonal System R32V2



     XtAddExposureToRegion(3Xt)        XtAddExposureToRegion(3Xt)



     NAME
          XtAddExposureToRegion - merge exposure events into a
          region

     SYNOPSIS
          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 ALSO
          X Toolkit Intrinsics Programming Manual
          Xlib Programming Manual

























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