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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 itkNeighborhoodAccessorFunctor_h
#define itkNeighborhoodAccessorFunctor_h
#include "itkImageBoundaryCondition.h"
#include "itkImageBase.h"
namespace itk
{
/** \class NeighborhoodAccessorFunctor
* \brief Provides accessor interfaces to Get pixels and is meant to be
* used on pointers contained within Neighborhoods. A typical user should
* not need to use this class directly. This class is used by the
* neighborhood iterators to get pixels from pixel pointers or assign
* a pixel to an address.
*
*
* \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 ITKCommon
*/
template <typename TImage>
class ITK_TEMPLATE_EXPORT NeighborhoodAccessorFunctor final
{
public:
using Self = NeighborhoodAccessorFunctor;
using ImageType = TImage;
using PixelType = typename ImageType::PixelType;
using InternalPixelType = typename ImageType::InternalPixelType;
using VectorLengthType = unsigned int;
using OffsetType = typename ImageType::OffsetType;
static constexpr unsigned int ImageDimension = TImage::ImageDimension;
using NeighborhoodType = Neighborhood<InternalPixelType *, Self::ImageDimension>;
template <typename TOutput = ImageType>
using ImageBoundaryConditionType = ImageBoundaryCondition<ImageType, TOutput>;
/** Set the pointer index to the start of the buffer. */
inline void
SetBegin(const InternalPixelType *)
{}
/** Method to dereference a pixel pointer. This is used from the
* ConstNeighborhoodIterator as the equivalent operation to (*it).
* This method should be preferred over the former (*it) notation.
* The reason is that dereferencing a pointer to a location of
* VectorImage pixel involves a different operation that simply
* dereferencing the pointer. */
inline PixelType
Get(const InternalPixelType * pixelPointer) const
{
return (*pixelPointer);
}
/** Method to set the pixel value at a certain pixel pointer */
inline void
Set(InternalPixelType * const pixelPointer, const PixelType & p) const
{
*pixelPointer = p;
}
template <typename TOutput>
inline typename ImageBoundaryConditionType<TOutput>::OutputPixelType
BoundaryCondition(const OffsetType & point_index,
const OffsetType & boundary_offset,
const NeighborhoodType * data,
const ImageBoundaryConditionType<TOutput> * boundaryCondition) const
{
return boundaryCondition->operator()(point_index, boundary_offset, data);
}
void SetVectorLength(VectorLengthType) {}
VectorLengthType
SetVectorLength()
{
return 0;
}
};
} // end namespace itk
// template< typename TImage > const unsigned int
// itk::NeighborhoodAccessorFunctor<TImage>::ImageDimension;
#endif
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