XtAddExposureToRegion - merge exposure events into a region
#include <X11/Intrinsic.h>
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