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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 itkFFTWInverse1DFFTImageFilter_h
#define itkFFTWInverse1DFFTImageFilter_h
#include "itkInverse1DFFTImageFilter.h"
#include "itkFFTWCommonExtended.h"
#include "itkImageRegionSplitterDirection.h"
#include "itkFFTImageFilterFactory.h"
#include <vector>
namespace itk
{
/** \class FFTWInverse1DFFTImageFilter
* \brief only do FFT along one dimension using FFTW as a backend.
*
* \ingroup ITKFFT
* \ingroup FourierTransform
*/
template <typename TInputImage,
typename TOutputImage =
Image<typename NumericTraits<typename TInputImage::PixelType>::ValueType, TInputImage::ImageDimension>>
class ITK_TEMPLATE_EXPORT FFTWInverse1DFFTImageFilter : public Inverse1DFFTImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(FFTWInverse1DFFTImageFilter);
using Self = FFTWInverse1DFFTImageFilter;
using Superclass = Inverse1DFFTImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Standard class type alias.*/
using InputImageType = typename Superclass::InputImageType;
using OutputImageType = typename Superclass::OutputImageType;
using OutputImageRegionType = typename OutputImageType::RegionType;
/**
* the proxy type is a wrapper for the fftw API
* since the proxy is only defined over double and float,
* trying to use any other pixel type is inoperative, as
* is trying to use double if only the float FFTW1D version is
* configured in, or float if only double is configured.
*/
using FFTW1DProxyType = typename fftw::ComplexToComplexProxy<typename TOutputImage::PixelType>;
using PlanArrayType = typename std::vector<typename FFTW1DProxyType::PlanType>;
using PlanBufferPointerType = typename std::vector<typename FFTW1DProxyType::ComplexType *>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(FFTWInverse1DFFTImageFilter);
protected:
FFTWInverse1DFFTImageFilter();
~FFTWInverse1DFFTImageFilter() override;
void
BeforeThreadedGenerateData() override;
void
ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread, ThreadIdType threadID) override;
/** Override to return a splitter that does not split along the direction we
* are performing the transform. */
const ImageRegionSplitterBase *
GetImageRegionSplitter() const override;
private:
ImageRegionSplitterDirection::Pointer m_ImageRegionSplitter{};
/** Destroy FFTW Plans and associated buffers. */
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<FFTWInverse1DFFTImageFilter>
{
template <typename TUnderlying>
using InputPixelType = std::complex<TUnderlying>;
template <typename TUnderlying>
using OutputPixelType = TUnderlying;
using FilterDimensions = std::integer_sequence<unsigned int, 4, 3, 2, 1>;
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkFFTWInverse1DFFTImageFilter.hxx"
#endif
#endif // itkFFTWInverse1DFFTImageFilter_h
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