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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 itkNeighborhood_hxx
#define itkNeighborhood_hxx
#include "itkNumericTraits.h"
namespace itk
{
template <typename TPixel, unsigned int VDimension, typename TContainer>
void
Neighborhood<TPixel, VDimension, TContainer>::ComputeNeighborhoodStrideTable()
{
OffsetValueType accum = 1;
for (DimensionValueType dim = 0; dim < VDimension; ++dim)
{
m_StrideTable[dim] = accum;
accum *= m_Size[dim];
}
}
template <typename TPixel, unsigned int VDimension, typename TContainer>
void
Neighborhood<TPixel, VDimension, TContainer>::ComputeNeighborhoodOffsetTable()
{
m_OffsetTable.clear();
m_OffsetTable.reserve(this->Size());
OffsetType o;
DimensionValueType i, j;
for (j = 0; j < VDimension; ++j)
{
o[j] = -(static_cast<OffsetValueType>(this->GetRadius(j)));
}
for (i = 0; i < this->Size(); ++i)
{
m_OffsetTable.push_back(o);
for (j = 0; j < VDimension; ++j)
{
o[j] = o[j] + 1;
if (o[j] > static_cast<OffsetValueType>(this->GetRadius(j)))
{
o[j] = -(static_cast<OffsetValueType>(this->GetRadius(j)));
}
else
{
break;
}
}
}
}
template <typename TPixel, unsigned int VDimension, typename TContainer>
void
Neighborhood<TPixel, VDimension, TContainer>::SetRadius(const SizeValueType s)
{
SizeType k;
for (DimensionValueType i = 0; i < VDimension; ++i)
{
k[i] = s;
}
this->SetRadius(k);
}
template <typename TPixel, unsigned int VDimension, typename TContainer>
void
Neighborhood<TPixel, VDimension, TContainer>::SetRadius(const SizeType & r)
{
this->m_Radius = r;
this->SetSize();
this->Allocate(m_Size.CalculateProductOfElements());
this->ComputeNeighborhoodStrideTable();
this->ComputeNeighborhoodOffsetTable();
}
template <typename TPixel, unsigned int VDimension, typename TContainer>
std::slice
Neighborhood<TPixel, VDimension, TContainer>::GetSlice(unsigned int d) const
{
const OffsetValueType t = this->GetStride(d);
const auto s = static_cast<OffsetValueType>(this->GetSize()[d]);
OffsetValueType n = this->Size() / 2;
n -= t * s / 2;
return { static_cast<size_t>(n), static_cast<size_t>(s), static_cast<size_t>(t) };
}
template <typename TPixel, unsigned int VDimension, typename TContainer>
auto
Neighborhood<TPixel, VDimension, TContainer>::GetNeighborhoodIndex(const OffsetType & o) const -> NeighborIndexType
{
unsigned int idx = (this->Size() / 2);
for (unsigned int i = 0; i < VDimension; ++i)
{
idx += o[i] * m_StrideTable[i];
}
return idx;
}
template <typename TPixel, unsigned int VDimension, typename TContainer>
void
Neighborhood<TPixel, VDimension, TContainer>::PrintSelf(std::ostream & os, Indent indent) const
{
os << indent << "Size: " << static_cast<typename NumericTraits<SizeType>::PrintType>(m_Size) << std::endl;
os << indent << "Radius: " << static_cast<typename NumericTraits<SizeType>::PrintType>(m_Radius) << std::endl;
os << indent << "StrideTable: [ ";
for (DimensionValueType i = 0; i < VDimension; ++i)
{
os << indent.GetNextIndent() << m_StrideTable[i] << ' ';
}
os << ']' << std::endl;
os << indent << "OffsetTable: [ ";
for (DimensionValueType i = 0; i < m_OffsetTable.size(); ++i)
{
os << indent.GetNextIndent() << m_OffsetTable[i] << ' ';
}
os << ']' << std::endl;
}
} // namespace itk
#endif
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