DOKK / manpages / debian 10 / libx11-doc / XDestroyRegion.3.en
XCreateRegion(3) XLIB FUNCTIONS XCreateRegion(3)

XCreateRegion, XSetRegion, XDestroyRegion - create or destroy regions

Region XCreateRegion(void);

int XSetRegion(Display *display, GC gc, Region r);

int XDestroyRegion(Region r);

Specifies the connection to the X server.
Specifies the GC.
Specifies the region.

The XCreateRegion function creates a new empty region.

The XSetRegion function sets the clip-mask in the GC to the specified region. The region is specified relative to the drawable's origin. The resulting GC clip origin is implementation-dependent. Once it is set in the GC, the region can be destroyed.

The XDestroyRegion function deallocates the storage associated with a specified region.

XEmptyRegion(3), XIntersectRegion(3)
Xlib - C Language X Interface

libX11 1.6.7 X Version 11