XtAddExposureToRegion.3Xt.gz(3Xt)



XtAddExposureToRegion(3Xt)    SDK X11 R4.11MU05   XtAddExposureToRegion(3Xt)


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


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