itkBinShrinkImageFilter.h

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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 itkBinShrinkImageFilter_h
#define itkBinShrinkImageFilter_h
 
#include "itkShrinkImageFilter.h"
#include <type_traits>
 
namespace itk
{

template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT BinShrinkImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(BinShrinkImageFilter);

  using Self = BinShrinkImageFilter;
  using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(BinShrinkImageFilter);

  using OutputImageType = TOutputImage;
  using InputImageType = TInputImage;
  using OutputImagePointer = typename OutputImageType::Pointer;
  using InputImagePointer = typename InputImageType::Pointer;
  using InputImageConstPointer = typename InputImageType::ConstPointer;
 
  using OutputOffsetType = typename TOutputImage::OffsetType;
  using OutputIndexType = typename TOutputImage::IndexType;
  using InputIndexType = typename TInputImage::IndexType;

  using OutputImageRegionType = typename TOutputImage::RegionType;

  static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
  static constexpr unsigned int OutputImageDimension = TOutputImage::ImageDimension;
 
  using ShrinkFactorsType = FixedArray<unsigned int, ImageDimension>;

  itkSetMacro(ShrinkFactors, ShrinkFactorsType);
  void
  SetShrinkFactors(unsigned int factor);
  void
  SetShrinkFactor(unsigned int i, unsigned int factor);

  itkGetConstReferenceMacro(ShrinkFactors, ShrinkFactorsType);
 
  void
  GenerateOutputInformation() override;

  void
  GenerateInputRequestedRegion() override;
 
 
  itkConceptMacro(InputConvertibleToOutputCheck,
                  (Concept::Convertible<typename TInputImage::PixelType, typename TOutputImage::PixelType>));
  itkConceptMacro(SameDimensionCheck, (Concept::SameDimension<ImageDimension, OutputImageDimension>));
 
protected:
  BinShrinkImageFilter();
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  void
  DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;
 
private:
  ShrinkFactorsType m_ShrinkFactors{};

  template <class TOutputType, class TInputType>
  std::enable_if_t<std::numeric_limits<TOutputType>::is_integer, TOutputType>
  RoundIfInteger(TInputType input)
  {
    return Math::Round<TOutputType>(input);
  }
 
  // For Non-fundamental types numeric_limits is not specialized, and
  // is_integer defaults to false.
  template <class TOutputType, class TInputType>
  std::enable_if_t<!std::numeric_limits<TOutputType>::is_integer, TOutputType>
  RoundIfInteger(const TInputType & input, ...)
  {
    return static_cast<TOutputType>(input);
  }
};
 
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkBinShrinkImageFilter.hxx"
#endif
 
#endif