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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 itkHalfToFullHermitianImageFilter_hxx
#define itkHalfToFullHermitianImageFilter_hxx
#include "itkImageAlgorithm.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkTotalProgressReporter.h"
namespace itk
{
template <typename TInputImage>
HalfToFullHermitianImageFilter<TInputImage>::HalfToFullHermitianImageFilter()
{
this->ActualXDimensionIsOddOff();
this->DynamicMultiThreadingOn();
this->ThreaderUpdateProgressOff();
}
template <typename TInputImage>
void
HalfToFullHermitianImageFilter<TInputImage>::GenerateOutputInformation()
{
// Call the superclass' implementation of this method
Superclass::GenerateOutputInformation();
// Get pointers to the input and output
typename InputImageType::ConstPointer inputPtr = this->GetInput();
typename OutputImageType::Pointer outputPtr = this->GetOutput();
if (!inputPtr || !outputPtr)
{
return;
}
const typename InputImageType::SizeType & inputSize = inputPtr->GetLargestPossibleRegion().GetSize();
const typename InputImageType::IndexType & inputStartIndex = inputPtr->GetLargestPossibleRegion().GetIndex();
typename OutputImageType::SizeType outputSize;
typename OutputImageType::IndexType outputStartIndex;
for (unsigned int i = 0; i < OutputImageType::ImageDimension; ++i)
{
outputSize[i] = inputSize[i];
outputStartIndex[i] = inputStartIndex[i];
}
outputSize[0] = (inputSize[0] - 1) * 2;
if (this->GetActualXDimensionIsOdd())
{
outputSize[0]++;
}
const typename OutputImageType::RegionType outputLargestPossibleRegion(outputStartIndex, outputSize);
outputPtr->SetLargestPossibleRegion(outputLargestPossibleRegion);
}
template <typename TInputImage>
void
HalfToFullHermitianImageFilter<TInputImage>::GenerateInputRequestedRegion()
{
Superclass::GenerateInputRequestedRegion();
// Get pointers to the input and output
typename InputImageType::Pointer inputPtr = const_cast<InputImageType *>(this->GetInput());
if (inputPtr)
{
inputPtr->SetRequestedRegionToLargestPossibleRegion();
}
}
template <typename TInputImage>
void
HalfToFullHermitianImageFilter<TInputImage>::DynamicThreadedGenerateData(
const OutputImageRegionType & outputRegionForThread)
{
typename InputImageType::ConstPointer inputPtr = this->GetInput();
typename OutputImageType::Pointer outputPtr = this->GetOutput();
if (!inputPtr || !outputPtr)
{
return;
}
InputImageRegionType inputRegion = inputPtr->GetLargestPossibleRegion();
const InputImageIndexType & inputRegionIndex = inputRegion.GetIndex();
const InputImageSizeType & inputRegionSize = inputRegion.GetSize();
InputImageIndexType inputRegionMaximumIndex = inputRegionIndex + inputRegionSize;
// Copy the non-reflected region.
OutputImageRegionType copyRegion(outputRegionForThread);
bool copy = copyRegion.Crop(inputRegion);
// Set up the ProgressReporter.
TotalProgressReporter progress(this, outputPtr->GetRequestedRegion().GetNumberOfPixels());
if (copy)
{
ImageAlgorithm::Copy(inputPtr.GetPointer(), outputPtr.GetPointer(), copyRegion, copyRegion);
progress.Completed(copyRegion.GetNumberOfPixels());
}
// Now copy the redundant complex conjugate region, if there is one
// in this thread's output region.
OutputImageIndexType outputRegionIndex = outputRegionForThread.GetIndex();
OutputImageSizeType outputRegionSize = outputRegionForThread.GetSize();
OutputImageIndexType outputRegionMaximumIndex = outputRegionIndex + outputRegionSize;
if (outputRegionMaximumIndex[0] > inputRegionMaximumIndex[0])
{
OutputImageIndexType conjugateRegionIndex(outputRegionIndex);
conjugateRegionIndex[0] = std::max(outputRegionIndex[0], inputRegionMaximumIndex[0]);
OutputImageSizeType conjugateRegionSize(outputRegionSize);
conjugateRegionSize[0] = outputRegionMaximumIndex[0] - conjugateRegionIndex[0];
OutputImageRegionType conjugateRegion(conjugateRegionIndex, conjugateRegionSize);
ImageRegionIteratorWithIndex<OutputImageType> oIt(outputPtr, conjugateRegion);
for (oIt.GoToBegin(); !oIt.IsAtEnd(); ++oIt)
{
OutputImageIndexType conjugateIndex = oIt.GetIndex();
// Flip the indices in each dimension.
OutputImageIndexType index(conjugateIndex);
for (unsigned int i = 0; i < ImageDimension; ++i)
{
OutputImageRegionType outputLargestPossibleRegion = outputPtr->GetLargestPossibleRegion();
OutputImageIndexType outputLargestPossibleRegionIndex = outputLargestPossibleRegion.GetIndex();
OutputImageSizeType outputLargestPossibleRegionSize = outputLargestPossibleRegion.GetSize();
if (conjugateIndex[i] != outputLargestPossibleRegionIndex[i])
{
index[i] = outputLargestPossibleRegionSize[i] - conjugateIndex[i] + 2 * outputLargestPossibleRegionIndex[i];
}
}
oIt.Set(std::conj(inputPtr->GetPixel(index)));
progress.CompletedPixel();
}
}
}
} // end namespace itk
#endif // itkHalfToFullHermitianImageFilter_hxx
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