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CentOS 7.0 - man page for xtaddexposuretoregion (centos section 3)

XtAddExposureToRegion(3)			     XT FUNCTIONS			     XtAddExposureToRegion(3)

NAME
XtAddExposureToRegion - merge exposure events into a region
SYNTAX
void XtAddExposureToRegion(XEvent *event, Region region);
ARGUMENTS
event Specifies a pointer to the Expose or GraphicsExpose event. region Specifies the region object (as defined in <X11/Xutil.h>).
DESCRIPTION
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).
SEE ALSO
X Toolkit Intrinsics - C Language Interface Xlib - C Language X Interface X Version 11 libXt 1.1.4 XtAddExposureToRegion(3)


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