itkFFTWComplexToComplex1DFFTImageFilter.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 itkFFTWComplexToComplex1DFFTImageFilter_h
#define itkFFTWComplexToComplex1DFFTImageFilter_h
 
#include "itkComplexToComplex1DFFTImageFilter.h"
#include "itkFFTWCommonExtended.h"
#include "itkImageRegionSplitterDirection.h"
 
#include "itkFFTImageFilterFactory.h"
 
#include <vector>
 
 
namespace itk
{

template <typename TInputImage, typename TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT FFTWComplexToComplex1DFFTImageFilter
  : public ComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>
{
public:
  using Self = FFTWComplexToComplex1DFFTImageFilter;
  using Superclass = ComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  using InputImageType = typename Superclass::InputImageType;
  using OutputImageType = typename Superclass::OutputImageType;
  using OutputImageRegionType = typename OutputImageType::RegionType;

  using FFTW1DProxyType = typename fftw::ComplexToComplexProxy<typename TInputImage::PixelType::value_type>;
  using PlanArrayType = std::vector<typename FFTW1DProxyType::PlanType>;
  using PlanBufferPointerType = std::vector<typename FFTW1DProxyType::ComplexType *>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(FFTWComplexToComplex1DFFTImageFilter);
 
 
protected:
  FFTWComplexToComplex1DFFTImageFilter();
  ~FFTWComplexToComplex1DFFTImageFilter() override;
 
  void
  BeforeThreadedGenerateData() override;
  void
  ThreadedGenerateData(const OutputImageRegionType &, ThreadIdType threadID) override;

  [[nodiscard]] const ImageRegionSplitterBase *
  GetImageRegionSplitter() const override;
 
private:
  FFTWComplexToComplex1DFFTImageFilter(const Self &); // purposely not implemented
  void
  operator=(const Self &); // purposely not implemented
 
  ImageRegionSplitterDirection::Pointer m_ImageRegionSplitter{};

  void
  DestroyPlans();
 
  bool                  m_PlanComputed{ false };
  PlanArrayType         m_PlanArray{};
  unsigned int          m_LastImageSize{ 0 };
  PlanBufferPointerType m_InputBufferArray{};
  PlanBufferPointerType m_OutputBufferArray{};
};
 
 
// Describe whether input/output are real- or complex-valued
// for factory registration
template <>
struct FFTImageFilterTraits<FFTWComplexToComplex1DFFTImageFilter>
{
  template <typename TUnderlying>
  using InputPixelType = std::complex<TUnderlying>;
  template <typename TUnderlying>
  using OutputPixelType = std::complex<TUnderlying>;
  using FilterDimensions = std::integer_sequence<unsigned int, 4, 3, 2, 1>;
};
 
// Disable the precision whose FFTW backend is absent (avoids instantiating an undefined fftw proxy).
#if !defined(ITK_USE_FFTWF)
template <>
struct FFTImageFilterEnableFloat<FFTWComplexToComplex1DFFTImageFilter> : std::false_type
{};
#endif
#if !defined(ITK_USE_FFTWD)
template <>
struct FFTImageFilterEnableDouble<FFTWComplexToComplex1DFFTImageFilter> : std::false_type
{};
#endif
 
} // namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkFFTWComplexToComplex1DFFTImageFilter.hxx"
#endif
 
#endif // itkFFTWComplexToComplex1DFFTImageFilter_h