hpux man page for xrectinregion

XRectInRegion() 														   XRectInRegion()

Name
  XRectInRegion - determine if a rectangle resides in a region.

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

Arguments
  r	    Specifies the region.

  x	    Specify the x and y coordinates of the upper-left corner of the rectangle, relative to the region's origin.
  y
  width     Specify the width and height in pixels of the rectangle.
  height

Returns
  RectangleIn, RectangleOut, or RectanglePart.

Description
  XRectInRegion() returns RectangleIn if the rectangle is completely contained in the region r, RectangleOut if it is completely outside, and
  RectanglePart if it is partially inside.

  Regions are located using an offset from a point (the region origin) which is common to all regions.	It is up to the application to inter-
  pret the location of the region relative to a drawable.  If the region is to be used as a clip_mask by calling XSetRegion(), the upper-left
  corner of region relative to the drawable used in the graphics request will be at (xoffset + clip_x_origin, yoffset + clip_y_origin), where
  xoffset and yoffset are the offset of the region and clip_x_origin and clip_y_origin are the clip origin in the GC used.

  For this function, the x and y arguments are interpreted relative to the region origin; no drawable is involved.

Structures
  Region is a pointer to an opaque structure type.

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

Xlib - Regions															   XRectInRegion()