XtAddExposureToRegion - merge exposure events into a region

event     Specifies a pointer to the Expose or GraphicsExpose event.

       region    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).

       XtAddExposureToRegion - merge exposure events into a region

XToolkitIntrinsics-CLanguageInterfaceXlib-CLanguageXInterface

X Version 11                                       libXt 1.2.1                          XtAddExposureToRegion(3)

       #include <X11/Intrinsic.h>

       void XtAddExposureToRegion(XEvent *event, Region region);