hpux man page for xsetregion

XSetRegion()															      XSetRegion()

Name
  XSetRegion - set clip_mask of the graphics context to the specified region.

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

Arguments
  display   Specifies a connection to an X server; returned from XOpenDisplay().

  gc	    Specifies the graphics context.

  r	    Specifies the region.

Description
  XSetRegion()	sets  the  clip_mask component of a GC to the specified region.  Thereafter, all drawing made with gc will be confined to the
  area of intersection of the region and the drawable.	Once it is set in the GC, the region can be destroyed.

  XSetRegion sets the clip origin of the GC to an implementation-dependent value.

  For more information on regions, see Volume One, Chapter 5, The Graphics Context, and Chapter 6, Drawing Graphics and Text.

Structures
  Region is a pointer to an opaque structure type.

See Also
  XClipBox(), XCreateRegion(),	XDestroyRegion(),  XEmptyRegion(),  XEqualRegion(),  XIntersectRegion(),  XOffsetRegion(),  XPointInRegion(),
  XPolygonRegion(), XRectInRegion(), XShrinkRegion(), XSubtractRegion(), XUnionRectWithRegion(), XUnionRegion(), XXorRegion().

Xlib - Regions															      XSetRegion()