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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkDefaultVectorPixelAccessor.h,v $
Language: C++
Date: $Date: 2005-09-16 15:00:37 $
Version: $Revision: 1.5 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkDefaultVectorPixelAccessor_h
#define __itkDefaultVectorPixelAccessor_h
#include "itkMacro.h"
#include "itkVariableLengthVector.h"
namespace itk
{
/** \class DefaultVectorPixelAccessor
* \brief Give access to partial aspects of a type
*
* DefaultVectorPixelAccessor is specifically meant to provide VectorImage
* with the same \c DefaultPixelAccessor interface that
* DefaultPixelAccessor provides to Image.
*
* The template paramters is the type that is contained in by the elements of
* a vector.
*
* The class also contains a m_VectorLength paramter, set with the SetVectorLength
* method to set the length of the vectors. This must be set before the accessor
* can be used. This is the length of each of the vector containers.
*
* \note
* This work is part of the National Alliance for Medical Image Computing
* (NAMIC), funded by the National Institutes of Health through the NIH Roadmap
* for Medical Research, Grant U54 EB005149.
*
* \ingroup ImageAdaptors
*/
template <class TType >
class ITK_EXPORT DefaultVectorPixelAccessor
{
public:
typedef unsigned int VectorLengthType;
/** External typedef. It defines the external aspect
* that this class will exhibit. Here it is an VariableLengthVector. The container does not
* manage the memory. In other words it is an array reference with the contents
* pointing to the actual data in the image. */
typedef VariableLengthVector< TType > ExternalType;
/** Internal typedef. It defines the internal real representation of data. */
typedef TType InternalType;
/** Set output using the value in input */
inline void Set(InternalType & output, const ExternalType & input,
const unsigned long offset ) const
{
InternalType *truePixel = (&output) + offset*m_OffsetMultiplier;
for( VectorLengthType i=0; i< m_VectorLength; i++ )
{
truePixel[i] = input[i];
}
}
/** Get the value from input */
inline ExternalType Get( const InternalType & input, const unsigned long offset ) const
{
ExternalType output( (&input)+(offset*m_OffsetMultiplier) , m_VectorLength );
return output;
}
/** Set the length of each vector in the VectorImage */
void SetVectorLength( VectorLengthType l)
{
m_VectorLength = l;
m_OffsetMultiplier = (l-1);
}
/** Get Vector lengths */
VectorLengthType GetVectorLength() const { return m_VectorLength; }
DefaultVectorPixelAccessor() {}
/** Constructor to initialize VectorLength at construction time */
DefaultVectorPixelAccessor( VectorLengthType l )
{
m_VectorLength = l;
m_OffsetMultiplier = l-1;
}
virtual ~DefaultVectorPixelAccessor() {};
private:
VectorLengthType m_VectorLength;
VectorLengthType m_OffsetMultiplier;
};
} // end namespace itk
#endif
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