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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 itkCastImageFilter_hxx
#define itkCastImageFilter_hxx
#include "itkProgressReporter.h"
#include "itkImageAlgorithm.h"
namespace itk
{
template <typename TInputImage, typename TOutputImage>
CastImageFilter<TInputImage, TOutputImage>::CastImageFilter()
{
this->SetNumberOfRequiredInputs(1);
this->InPlaceOff();
this->DynamicMultiThreadingOn();
}
template <typename TInputImage, typename TOutputImage>
void
CastImageFilter<TInputImage, TOutputImage>::GenerateData()
{
if (this->GetInPlace() && this->CanRunInPlace())
{
// nothing to do, so avoid iterating over all the pixels
// for nothing! Allocate the output, generate a fake progress and exit
this->AllocateOutputs();
ProgressReporter progress(this, 0, 1);
return;
}
// else do normal Before+Threaded+After
Superclass::GenerateData();
}
template <typename TInputImage, typename TOutputImage>
void
CastImageFilter<TInputImage, TOutputImage>::GenerateOutputInformation()
{
// do not call the superclass' implementation of this method since
// this filter allows the input the output to be of different dimensions
// get pointers to the input and output
TOutputImage * outputPtr = this->GetOutput();
const TInputImage * inputPtr = this->GetInput();
if (!outputPtr || !inputPtr)
{
return;
}
// Set the output image largest possible region. Use a RegionCopier
// so that the input and output images can be different dimensions.
OutputImageRegionType outputLargestPossibleRegion;
this->CallCopyInputRegionToOutputRegion(outputLargestPossibleRegion, inputPtr->GetLargestPossibleRegion());
outputPtr->SetLargestPossibleRegion(outputLargestPossibleRegion);
ImageToImageFilterDetail::ImageInformationCopier<Superclass::OutputImageDimension, Superclass::InputImageDimension>
informationCopier;
informationCopier(outputPtr, inputPtr);
}
template <typename TInputImage, typename TOutputImage>
void
CastImageFilter<TInputImage, TOutputImage>::DynamicThreadedGenerateData(
const OutputImageRegionType & outputRegionForThread)
{
DynamicThreadedGenerateDataDispatched<InputPixelType, OutputPixelType>(outputRegionForThread);
}
template <typename TInputImage, typename TOutputImage>
template <typename TInputPixelType,
typename TOutputPixelType,
std::enable_if_t<mpl::is_static_castable<TInputPixelType, TOutputPixelType>::value, int>>
void
CastImageFilter<TInputImage, TOutputImage>::DynamicThreadedGenerateDataDispatched(
const OutputImageRegionType & outputRegionForThread)
{
const TInputImage * inputPtr = this->GetInput();
TOutputImage * outputPtr = this->GetOutput(0);
// Define the portion of the input to walk for this thread, using
// the CallCopyOutputRegionToInputRegion method allows for the input
// and output images to be different dimensions
typename TInputImage::RegionType inputRegionForThread;
this->CallCopyOutputRegionToInputRegion(inputRegionForThread, outputRegionForThread);
ImageAlgorithm::Copy(inputPtr, outputPtr, inputRegionForThread, outputRegionForThread);
}
template <typename TInputImage, typename TOutputImage>
template <typename TInputPixelType,
typename TOutputPixelType,
std::enable_if_t<!mpl::is_static_castable<TInputPixelType, TOutputPixelType>::value, int>>
void
CastImageFilter<TInputImage, TOutputImage>::DynamicThreadedGenerateDataDispatched(
const OutputImageRegionType & outputRegionForThread)
{
// Implementation for non-implicit convertible pixels which are
// itk-array-like.
static_assert(std::is_convertible_v<typename InputPixelType::ValueType, typename OutputPixelType::ValueType>,
"Component types are required to be convertible.");
const typename OutputImageRegionType::SizeType & regionSize = outputRegionForThread.GetSize();
if (regionSize[0] == 0)
{
return;
}
const TInputImage * inputPtr = this->GetInput();
TOutputImage * outputPtr = this->GetOutput(0);
// Define the portion of the input to walk for this thread, using
// the CallCopyOutputRegionToInputRegion method allows for the input
// and output images to be different dimensions
typename TInputImage::RegionType inputRegionForThread;
this->CallCopyOutputRegionToInputRegion(inputRegionForThread, outputRegionForThread);
const unsigned int componentsPerPixel = outputPtr->GetNumberOfComponentsPerPixel();
// Define the iterators
ImageScanlineConstIterator inputIt(inputPtr, inputRegionForThread);
ImageScanlineIterator outputIt(outputPtr, outputRegionForThread);
OutputPixelType value{ outputIt.Get() };
while (!inputIt.IsAtEnd())
{
while (!inputIt.IsAtEndOfLine())
{
const InputPixelType & inputPixel = inputIt.Get();
for (unsigned int k = 0; k < componentsPerPixel; ++k)
{
value[k] = static_cast<typename OutputPixelType::ValueType>(inputPixel[k]);
}
outputIt.Set(value);
++inputIt;
++outputIt;
}
inputIt.NextLine();
outputIt.NextLine();
}
}
} // end namespace itk
#endif
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