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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
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