hpux man page for xshrinkregion

XShrinkRegion() 														   XShrinkRegion()

Name
  XShrinkRegion - reduce or expand the size of a region.

Synopsis
  XShrinkRegion(r, dx, dy)
	Region r;
	int dx, dy;

Arguments
  r	    Specifies the region.

  dx	    Specify the amounts by which you want to shrink or expand the specified region.  Positive values shrink the region while negative
  dy	    values expand the region.

Description
  XShrinkRegion() changes the width and/or height of the specified region.  Positive values shrink the region;	negative  values  expand  the
  region.   It	is  legal  to  expand the region in one dimension at the same time as shrinking it in the other dimension.  The offset of the
  region is changed to keep the center of the resized region near its original position.

  The exact amount of shrinkage for a given value for dx or dy is not specified by Xlib.

Structures
  Region is a pointer to an opaque structure type.

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

Xlib - Regions															   XShrinkRegion()