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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 itkFFTWInverseFFTImageFilter_hxx
#define itkFFTWInverseFFTImageFilter_hxx
#include "itkFullToHalfHermitianImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkProgressReporter.h"
#include "itkMultiThreaderBase.h"
namespace itk
{
template <typename TInputImage, typename TOutputImage>
FFTWInverseFFTImageFilter<TInputImage, TOutputImage>::FFTWInverseFFTImageFilter()
{
#ifndef ITK_USE_CUFFTW
m_PlanRigor = FFTWGlobalConfiguration::GetPlanRigor();
#endif
this->DynamicMultiThreadingOn();
}
template <typename TInputImage, typename TOutputImage>
void
FFTWInverseFFTImageFilter<TInputImage, TOutputImage>::BeforeThreadedGenerateData()
{
// Get pointers to the input and output.
typename InputImageType::ConstPointer inputPtr = this->GetInput();
typename OutputImageType::Pointer outputPtr = this->GetOutput();
if (!inputPtr || !outputPtr)
{
return;
}
// We don't have a nice progress to report, but at least this simple line
// reports the beginning and the end of the process.
ProgressReporter progress(this, 0, 1);
// Allocate output buffer memory.
outputPtr->SetBufferedRegion(outputPtr->GetRequestedRegion());
outputPtr->Allocate();
const InputSizeType inputSize = inputPtr->GetLargestPossibleRegion().GetSize();
const OutputSizeType outputSize = outputPtr->GetLargestPossibleRegion().GetSize();
// Figure out sizes.
// Size of input and output aren't the same which is handled in the superclass,
// sort of.
// The input size and output size only differ in the fastest moving dimension.
unsigned int totalOutputSize = 1;
unsigned int totalInputSize = 1;
for (unsigned int i = 0; i < ImageDimension; ++i)
{
totalOutputSize *= outputSize[i];
totalInputSize *= inputSize[i];
}
// Cut the full complex image to just the portion needed by FFTW.
using FullToHalfFilterType = FullToHalfHermitianImageFilter<InputImageType>;
auto fullToHalfFilter = FullToHalfFilterType::New();
fullToHalfFilter->SetInput(this->GetInput());
fullToHalfFilter->SetNumberOfWorkUnits(this->GetNumberOfWorkUnits());
fullToHalfFilter->UpdateLargestPossibleRegion();
auto * in = (typename FFTWProxyType::ComplexType *)fullToHalfFilter->GetOutput()->GetBufferPointer();
OutputPixelType * out = outputPtr->GetBufferPointer();
typename FFTWProxyType::PlanType plan;
int sizes[ImageDimension];
for (unsigned int i = 0; i < ImageDimension; ++i)
{
sizes[(ImageDimension - 1) - i] = outputSize[i];
}
plan = FFTWProxyType::Plan_dft_c2r(
ImageDimension, sizes, in, out, m_PlanRigor, MultiThreaderBase::GetGlobalDefaultNumberOfThreads(), false);
FFTWProxyType::Execute(plan);
// Some cleanup.
FFTWProxyType::DestroyPlan(plan);
}
template <typename TInputImage, typename TOutputImage>
void
FFTWInverseFFTImageFilter<TInputImage, TOutputImage>::DynamicThreadedGenerateData(
const OutputImageRegionType & outputRegionForThread)
{
using IteratorType = ImageRegionIterator<OutputImageType>;
unsigned long totalOutputSize = this->GetOutput()->GetRequestedRegion().GetNumberOfPixels();
IteratorType it(this->GetOutput(), outputRegionForThread);
while (!it.IsAtEnd())
{
it.Set(it.Value() / totalOutputSize);
++it;
}
}
template <typename TInputImage, typename TOutputImage>
void
FFTWInverseFFTImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
#ifndef ITK_USE_CUFFTW
os << indent << "PlanRigor: " << FFTWGlobalConfiguration::GetPlanRigorName(m_PlanRigor) << " (" << m_PlanRigor << ')'
<< std::endl;
#endif
}
template <typename TInputImage, typename TOutputImage>
SizeValueType
FFTWInverseFFTImageFilter<TInputImage, TOutputImage>::GetSizeGreatestPrimeFactor() const
{
return FFTWProxyType::GREATEST_PRIME_FACTOR;
}
} // namespace itk
#endif // _itkFFTWInverseFFTImageFilter_hxx
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