XtAddExposureToRegion(Xt) 6 January 1993 XtAddExposureToRegion(Xt)
X Version 11 (Release 5)
Name
XtAddExposureToRegion - merge exposure events into a region
Syntax
void XtAddExposureToRegion(event, region)
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
7.10.3 of X Toolkit Intrinsics - C Language Interface.
See also
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface