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X11R7.4 - man page for xtaddexposuretoregion (x11r4 section 3)

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XtAddExposureToRegion(3)		   XT FUNCTIONS 		 XtAddExposureToRegion(3)

       XtAddExposureToRegion - merge exposure events into a region

       void XtAddExposureToRegion(XEvent *event, Region 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).

       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11				   libXt 1.0.5			 XtAddExposureToRegion(3)
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