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itkPixelAccessor.h
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itkPixelAccessor.h
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkPixelAccessor.h
Language: C++
Date: $Date$
Version: $Revision$
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 __itkPixelAccessor_h
#define __itkPixelAccessor_h
#include "itkMacro.h"
namespace itk
{
/** \class PixelAccessor
* \brief Give access to partial aspects of a type
*
* PixelAccessor is templated over an internal type and an
* external type representation. This class encapsulates a
* customized convertion between the internal and external
* type representations.
*
* PixelAccessor is designed to be used in conjuntion with
* ImageAdaptors. An ImageAdaptor take an image and present it
* as another image in which the pixels are a pixel-to-pixel
* modification of the original image.
*
* ImageAdaptors are intended to perform task similar to ImageFilters,
* but reducing the overhead in memory allocation, at the price of some
* reduction in performance.
*
* ImageAdaptors are templated over a PixelAccessor class that
* will define what kind of transformation is applied to the
* pixel data. Typical uses of PixelAccessor include basic type
* casting, (e.g. make a float image looks like a unsigned int image).
*
* Every Image has a default PixelAccessor that performs an identity
* operation. ImageIterators use the PixelAccessor defined by the image
* in order to get and set the values of pixels.
*
* \ingroup ImageAdaptors
*/
template <class TInternalType, class TExternalType >
class ITK_EXPORT PixelAccessor
{
public:
/** External typedef. It defines the external aspect
* that this class will exhibit. */
typedef TExternalType ExternalType;
/** Internal typedef. It defines the internal real
* representation of data. */
typedef TInternalType InternalType;
inline void Set(TInternalType & output, const TExternalType & input) const
{output = (TInternalType) input;}
inline TExternalType Get( const TInternalType & input ) const
{return (TExternalType)input;}
};
} // end namespace itk
#endif