xfree86 man page for xrectinregion

XEmptyRegion(3X11)						  XLIB FUNCTIONS						XEmptyRegion(3X11)

NAME
       XEmptyRegion, XEqualRegion, XPointInRegion, XRectInRegion - determine if regions are empty or equal

SYNTAX
       Bool XEmptyRegion(Region r);

       Bool XEqualRegion(Region r1, Region r2);

       Bool XPointInRegion(Region r, int x, int y);

       int XRectInRegion(Region r, int x, int y, unsigned int width, unsigned int height);

ARGUMENTS
       r	 Specifies the region.

       r1
       r2	 Specify the two regions.

       width
       height	 Specify the width and height, which define the rectangle.  or the coordinates of the upper-left corner of the rectangle

       x
       y	 Specify the x and y coordinates, which define the point.

DESCRIPTION
       The XEmptyRegion function returns True if the region is empty.

       The XEqualRegion function returns True if the two regions have the same offset, size, and shape.

       The XPointInRegion function returns True if the point (x, y) is contained in the region r.

       The XRectInRegion function returns RectangleIn if the rectangle is entirely in the specified region, RectangleOut if the rectangle is
       entirely out of the specified region, and RectanglePart if the rectangle is partially in the specified region.

SEE ALSO
       XCreateRegion(3X11), XIntersectRegion(3X11)
       Xlib - C Language X Interface

XFree86 							   Version 4.7.0						XEmptyRegion(3X11)