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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 itkCheckerBoardImageFilter_hxx
#define itkCheckerBoardImageFilter_hxx
#include "itkImageRegionIteratorWithIndex.h"
#include "itkObjectFactory.h"
#include "itkTotalProgressReporter.h"
namespace itk
{
template <typename TImage>
CheckerBoardImageFilter<TImage>::CheckerBoardImageFilter()
{
m_CheckerPattern.Fill(4);
this->DynamicMultiThreadingOn();
this->ThreaderUpdateProgressOff();
}
template <typename TImage>
void
CheckerBoardImageFilter<TImage>::SetInput1(const InputImageType * image1)
{
// Process object is not const-correct so the const casting is required.
this->SetNthInput(0, const_cast<InputImageType *>(image1));
}
template <typename TImage>
void
CheckerBoardImageFilter<TImage>::SetInput2(const InputImageType * image2)
{
// Process object is not const-correct so the const casting is required.
this->SetNthInput(1, const_cast<InputImageType *>(image2));
}
template <typename TImage>
void
CheckerBoardImageFilter<TImage>::DynamicThreadedGenerateData(const ImageRegionType & outputRegionForThread)
{
// Get the output pointers
OutputImagePointer outputPtr = this->GetOutput();
InputImageConstPointer input1Ptr = this->GetInput(0);
InputImageConstPointer input2Ptr = this->GetInput(1);
// Create an iterator that will walk the output region for this thread.
using OutputIterator = ImageRegionIteratorWithIndex<OutputImageType>;
using InputIterator = ImageRegionConstIteratorWithIndex<InputImageType>;
OutputIterator outItr(outputPtr, outputRegionForThread);
InputIterator in1Itr(input1Ptr, outputRegionForThread);
InputIterator in2Itr(input2Ptr, outputRegionForThread);
TotalProgressReporter progress(this, outputPtr->GetRequestedRegion().GetNumberOfPixels());
typename InputImageType::SizeType size = input2Ptr->GetLargestPossibleRegion().GetSize();
PatternArrayType factors;
for (unsigned int d = 0; d < ImageDimension; ++d)
{
factors[d] = size[d] / m_CheckerPattern[d];
}
using PixelType = typename InputImageType::PixelType;
using IndexType = typename InputImageType::IndexType;
PixelType pixval;
// Walk the output region
while (!outItr.IsAtEnd())
{
IndexType index = outItr.GetIndex();
unsigned int sum = 0;
for (unsigned int i = 0; i < ImageDimension; ++i)
{
sum += static_cast<unsigned int>(index[i] / factors[i]);
}
if (sum & 1)
{
pixval = in2Itr.Get();
}
else
{
pixval = in1Itr.Get();
}
outItr.Set(pixval);
++outItr;
++in1Itr;
++in2Itr;
progress.CompletedPixel();
}
}
template <typename TImage>
void
CheckerBoardImageFilter<TImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Checker pattern: " << m_CheckerPattern << std::endl;
}
} // end namespace itk
#endif
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