XtAddExposureToRegion(3Xt)




XtAddExposureToRegion(3Xt)             XtAddExposureToRegion(3Xt)



NAME
     XtAddExposureToRegion - merges exposure events into a region

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

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 in X Toolkit Intrinsics - C Language In-
     terface).

   Arguments
     This function accepts the following arguments:

     event   Specifies a pointer to the Expose or
             GraphicsExpose event.

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

SEE ALSO
     X Toolkit Intrinsics - C Language Interface

     Xlib - C Language Interface























November, 1990                                                  1
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