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
