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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkDefaultVectorPixelAccessorFunctor_h
#define itkDefaultVectorPixelAccessorFunctor_h
#include "itkMacro.h"
namespace itk
{
/** \class DefaultVectorPixelAccessorFunctor
* \brief This class provides a common API for pixel accessors for Image and
* VectorImage. (between the DefaultVectorPixelAccessor and DefaultPixelAccessor).
*
* The pixel accessor is set with the SetPixelAccessor method. This accessor is
* meant to be used only for VectorImage and not for Image. Prior to use, the
* start of the VectorImage buffer must also be set with the SetBegin method.
*
* \sa DefaultVectorPixelAccessor
* \sa DefaultPixelAccessor
* \sa DefaultPixelAccessorFunctor
*
* \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
* \ingroup ITKCommon
*/
template< typename TImageType >
class DefaultVectorPixelAccessorFunctor
{
public:
typedef TImageType ImageType;
typedef typename ImageType::InternalPixelType InternalPixelType;
typedef typename ImageType::PixelType ExternalPixelType;
typedef typename ImageType::AccessorType PixelAccessorType;
typedef unsigned int VectorLengthType;
/**
* example usage:
* todo
*
*/
template <typename UImageType>
struct Rebind
{
typedef DefaultVectorPixelAccessorFunctor<UImageType> Type;
};
static void SetVectorLength(ImageType *image, VectorLengthType length)
{
image->SetVectorLength(length);
}
static VectorLengthType GetVectorLength(const ImageType *image)
{
return image->GetVectorLength();
}
DefaultVectorPixelAccessorFunctor () : m_Begin(ITK_NULLPTR) {}
/** Set the PixelAccessor. This is set at construction time by the image iterators.
* The type PixelAccessorType is obtained from the ImageType over which the iterators
* are templated.
* */
inline void SetPixelAccessor(PixelAccessorType & accessor)
{
m_PixelAccessor = accessor;
}
/** Set the pointer index to the start of the buffer. */
inline void SetBegin(const InternalPixelType *begin)
{ this->m_Begin = const_cast< InternalPixelType * >( begin ); }
/** Set output using the value in input */
inline void Set(InternalPixelType & output, const ExternalPixelType & input) const
{
m_PixelAccessor.Set(output, input, ( &output ) - m_Begin);
}
/** Get the value from input */
inline ExternalPixelType Get(const InternalPixelType & input) const
{
return m_PixelAccessor.Get(input, &input - m_Begin);
}
private:
PixelAccessorType m_PixelAccessor; // The pixel accessor
InternalPixelType *m_Begin; // Begin of the buffer
};
}
#endif
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