ultrix man page for xtaddexposuretoregion

XtAddExposureToRegion(3Xt)					     MIT X11R4						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 or event.

       region	 Specifies the region object (as defined in

Description
       The 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 or event, 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 Window System Toolkit: The Complete Programmer's Guide and Specification, Paul J. Asente and Ralph Swick
       X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

															XtAddExposureToRegion(3Xt)