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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_hxx
#define itkFFTWComplexToComplex1DFFTImageFilter_hxx
#include "itkComplexToComplex1DFFTImageFilter.hxx"
#include "itkFFTWCommonExtended.h"
#include "itkIndent.h"
#include "itkImageLinearConstIteratorWithIndex.h"
#include "itkImageLinearIteratorWithIndex.h"
#include "itkMetaDataObject.h"
#if defined(ITK_USE_FFTWF) || defined(ITK_USE_FFTWD)
namespace itk
{
template <typename TInputImage, typename TOutputImage>
FFTWComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>::FFTWComplexToComplex1DFFTImageFilter()
{
// We cannot split over the FFT direction
this->m_ImageRegionSplitter = ImageRegionSplitterDirection::New();
this->DynamicMultiThreadingOff();
}
template <typename TInputImage, typename TOutputImage>
FFTWComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>::~FFTWComplexToComplex1DFFTImageFilter()
{
if (m_PlanComputed)
{
this->DestroyPlans();
}
}
template <typename TInputImage, typename TOutputImage>
void
FFTWComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>::DestroyPlans()
{
for (unsigned int i = 0; i < m_PlanArray.size(); i++)
{
FFTW1DProxyType::DestroyPlan(m_PlanArray[i]);
delete[] m_InputBufferArray[i];
delete[] m_OutputBufferArray[i];
this->m_PlanComputed = false;
}
}
template <typename TInputImage, typename TOutputImage>
const ImageRegionSplitterBase *
FFTWComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>::GetImageRegionSplitter() const
{
return this->m_ImageRegionSplitter.GetPointer();
}
template <typename TInputImage, typename TOutputImage>
void
FFTWComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>::BeforeThreadedGenerateData()
{
Superclass::BeforeThreadedGenerateData();
this->m_ImageRegionSplitter->SetDirection(this->GetDirection());
OutputImageType * outputPtr = this->GetOutput();
const typename OutputImageType::SizeType & outputSize = outputPtr->GetRequestedRegion().GetSize();
const unsigned int lineSize = outputSize[this->m_Direction];
if (this->m_PlanComputed)
{
// if the image sizes aren't the same,
// we have to compute the plan again
if (this->m_LastImageSize != lineSize)
{
this->DestroyPlans();
}
}
if (!this->m_PlanComputed)
{
const int threads = this->GetNumberOfWorkUnits();
m_PlanArray.resize(threads);
m_InputBufferArray.resize(threads);
m_OutputBufferArray.resize(threads);
for (int i = 0; i < threads; i++)
{
try
{
m_InputBufferArray[i] = new typename FFTW1DProxyType::ComplexType[lineSize];
m_OutputBufferArray[i] = new typename FFTW1DProxyType::ComplexType[lineSize];
}
catch (const std::bad_alloc &)
{
itkExceptionMacro("Problem allocating memory for internal computations");
}
if (this->m_TransformDirection == Superclass::DIRECT)
{
m_PlanArray[i] = FFTW1DProxyType::Plan_dft_1d(
lineSize, m_InputBufferArray[i], m_OutputBufferArray[i], FFTW_FORWARD, FFTW_ESTIMATE, 1);
}
else // m_TransformDirection == INVERSE
{
m_PlanArray[i] = FFTW1DProxyType::Plan_dft_1d(
lineSize, m_InputBufferArray[i], m_OutputBufferArray[i], FFTW_BACKWARD, FFTW_ESTIMATE, 1);
}
}
this->m_LastImageSize = lineSize;
this->m_PlanComputed = true;
}
}
template <typename TInputImage, typename TOutputImage>
void
FFTWComplexToComplex1DFFTImageFilter<TInputImage, TOutputImage>::ThreadedGenerateData(
const OutputImageRegionType & outputRegion,
ThreadIdType threadID)
{
// get pointers to the input and output
const InputImageType * inputPtr = this->GetInput();
OutputImageType * outputPtr = this->GetOutput();
const typename OutputImageType::SizeType & outputSize = outputPtr->GetRequestedRegion().GetSize();
const unsigned int lineSize = outputSize[this->m_Direction];
using InputIteratorType = itk::ImageLinearConstIteratorWithIndex<InputImageType>;
using OutputIteratorType = itk::ImageLinearIteratorWithIndex<OutputImageType>;
InputIteratorType inputIt(inputPtr, outputRegion);
// the output region should be the same as the input region in the non-fft directions
OutputIteratorType outputIt(outputPtr, outputRegion);
inputIt.SetDirection(this->m_Direction);
outputIt.SetDirection(this->m_Direction);
typename InputIteratorType::PixelType * inputBufferIt;
typename OutputIteratorType::PixelType * outputBufferIt;
// for every fft line
for (inputIt.GoToBegin(), outputIt.GoToBegin(); !inputIt.IsAtEnd(); outputIt.NextLine(), inputIt.NextLine())
{
// copy the input line into our buffer
inputIt.GoToBeginOfLine();
inputBufferIt = reinterpret_cast<typename InputIteratorType::PixelType *>(m_InputBufferArray[threadID]);
while (!inputIt.IsAtEndOfLine())
{
*inputBufferIt = inputIt.Get();
++inputIt;
++inputBufferIt;
}
// do the transform
FFTW1DProxyType::Execute(m_PlanArray[threadID]);
if (this->m_TransformDirection == Superclass::DIRECT)
{
// copy the output from the buffer into our line
outputBufferIt = reinterpret_cast<typename OutputIteratorType::PixelType *>(m_OutputBufferArray[threadID]);
outputIt.GoToBeginOfLine();
while (!outputIt.IsAtEndOfLine())
{
outputIt.Set(*outputBufferIt);
++outputIt;
++outputBufferIt;
}
}
else // m_TransformDirection == INVERSE
{
// copy the output from the buffer into our line
outputBufferIt = reinterpret_cast<typename OutputIteratorType::PixelType *>(m_OutputBufferArray[threadID]);
outputIt.GoToBeginOfLine();
while (!outputIt.IsAtEndOfLine())
{
outputIt.Set(*outputBufferIt / static_cast<typename OutputIteratorType::PixelType>(lineSize));
++outputIt;
++outputBufferIt;
}
}
}
}
} // namespace itk
#endif // defined( ITK_USE_FFTWF ) || defined( ITK_USE_FFTWD )
#endif //_itkFFTWComplexToComplex1DFFTImageFilter_hxx
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