#ifndef __itkvHGWUtilities_h
#define __itkvHGWUtilities_h

#include <list>

#include "itkSharedMorphUtilities.h"

namespace itk {

/**
 * \class vHGWUtilities 
 * \brief functionality in common for anchor openings/closings and
 * erosions/dilation
 *
**/

#if 0
// version with no user access to border
template <class TImage, class TBres, class TLine, class TFunction>
int fillLineBuffer(typename TImage::ConstPointer input,
		   const typename TImage::IndexType StartIndex,
		   typename TImage::PixelType border,
		   const TLine line,  // unit vector
		   const float tol,
		   const typename TBres::OffsetArray LineOffsets,
		   const typename TImage::RegionType AllImage,
		   const unsigned int KernLen,
		   typename TImage::PixelType * pixbuffer,
		   typename TImage::PixelType * fExtBuffer,
		   unsigned &start,
		   unsigned &end);
#else
template <class PixelType, class TFunction>
void fillReverseExt(PixelType *pixbuffer, PixelType *rExtBuffer, 
		    const unsigned int KernLen, unsigned len);

template <class PixelType, class TFunction>
void fillForwardExt(PixelType *pixbuffer, PixelType *fExtBuffer, 
		    const unsigned int KernLen, unsigned len);
#endif

template <class TImage, class TBres, class TFunction, class TLine>
void doFace(typename TImage::ConstPointer input,
	    typename TImage::Pointer output,
	    typename TImage::PixelType border,
	    TLine line,
	    const typename TBres::OffsetArray LineOffsets,
	    const unsigned int KernLen,
	    typename TImage::PixelType * pixbuffer,
	    typename TImage::PixelType * fExtBuffer,	      
	    typename TImage::PixelType * rExtBuffer,	      
	    const typename TImage::RegionType AllImage, 
	    const typename TImage::RegionType face);


} // namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkvHGWUtilities.txx"
#endif

#endif