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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* 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
*
* http://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 itkCyclicShiftImageFilter_hxx
#define itkCyclicShiftImageFilter_hxx
#include "itkCyclicShiftImageFilter.h"
#include "itkNumericTraits.h"
#include "itkProgressReporter.h"
#include "itkImageRegionIteratorWithIndex.h"
namespace itk
{
template< typename TInputImage, typename TOutputImage >
CyclicShiftImageFilter< TInputImage, TOutputImage >
::CyclicShiftImageFilter()
{
m_Shift.Fill( NumericTraits< OffsetValueType >::ZeroValue() );
}
template< typename TInputImage, typename TOutputImage >
void
CyclicShiftImageFilter< TInputImage, TOutputImage >
::GenerateInputRequestedRegion()
{
// Call the superclass' implementation of this method.
Superclass::GenerateInputRequestedRegion();
// We need all the input.
InputImagePointer input = const_cast< InputImageType * >( this->GetInput() );
if ( !input )
{
return;
}
input->SetRequestedRegionToLargestPossibleRegion();
}
template< typename TInputImage, typename TOutputImage >
void
CyclicShiftImageFilter< TInputImage, TOutputImage >
::ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
ThreadIdType threadId)
{
// Setup the progress reporter.
ProgressReporter progress( this, threadId, outputRegionForThread.GetNumberOfPixels() );
const InputImageType * inputImage = this->GetInput();
// The index and size of the image needed to compute the shift
const IndexType outIdx = this->GetOutput()->GetLargestPossibleRegion().GetIndex();
const SizeType outSize = this->GetOutput()->GetLargestPossibleRegion().GetSize();
// Now iterate over the pixels of the output region for this thread.
ImageRegionIteratorWithIndex< OutputImageType > outIt(this->GetOutput(), outputRegionForThread);
for ( outIt.GoToBegin(); !outIt.IsAtEnd(); ++outIt )
{
IndexType index = outIt.GetIndex();
for ( unsigned int i = 0; i < ImageDimension; ++i )
{
IndexValueType shiftedIdx = ( index[i] - outIdx[i] - m_Shift[i] )
% static_cast< OffsetValueType >(outSize[i]);
if ( shiftedIdx < 0 )
{
shiftedIdx += outSize[i];
}
index[i] = shiftedIdx + outIdx[i];
}
outIt.Set( static_cast< OutputImagePixelType >( inputImage->GetPixel( index ) ) );
progress.CompletedPixel();
}
}
template< typename TInputImage, typename TOutputImage >
void
CyclicShiftImageFilter< TInputImage, TOutputImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Shift: " << m_Shift << std::endl;
}
} // end namespace itk
#endif
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