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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 itkShiftScaleImageFilter_hxx
#define itkShiftScaleImageFilter_hxx
#include "itkImageScanlineIterator.h"
#include "itkNumericTraits.h"
#include "itkTotalProgressReporter.h"
namespace itk
{
template <typename TInputImage, typename TOutputImage>
void
ShiftScaleImageFilter<TInputImage, TOutputImage>::BeforeThreadedGenerateData()
{
// reset output variables
m_UnderflowCount = 0;
m_OverflowCount = 0;
}
template <typename TInputImage, typename TOutputImage>
void
ShiftScaleImageFilter<TInputImage, TOutputImage>::DynamicThreadedGenerateData(
const OutputImageRegionType & outputRegion)
{
const TInputImage * inputPtr = this->GetInput();
TOutputImage * outputPtr = this->GetOutput();
SizeValueType underflow = 0;
SizeValueType overflow = 0;
ImageScanlineIterator ot(outputPtr, outputRegion);
ImageScanlineConstIterator it(inputPtr, outputRegion);
// support progress methods/callbacks
TotalProgressReporter progress(this, outputPtr->GetRequestedRegion().GetNumberOfPixels());
// do the work
while (!it.IsAtEnd())
{
while (!it.IsAtEndOfLine())
{
// shift and scale the input pixels
const RealType value = (static_cast<RealType>(it.Get()) + m_Shift) * m_Scale;
if (value < NumericTraits<OutputImagePixelType>::NonpositiveMin())
{
ot.Set(NumericTraits<OutputImagePixelType>::NonpositiveMin());
++underflow;
}
else if (value > static_cast<RealType>(NumericTraits<OutputImagePixelType>::max()))
{
ot.Set(NumericTraits<OutputImagePixelType>::max());
++overflow;
}
else
{
ot.Set(static_cast<OutputImagePixelType>(value));
}
++it;
++ot;
}
it.NextLine();
ot.NextLine();
progress.Completed(outputRegion.GetSize()[0]);
}
const std::lock_guard<std::mutex> lockGuard(m_Mutex);
m_OverflowCount += overflow;
m_UnderflowCount += underflow;
}
template <typename TInputImage, typename TOutputImage>
void
ShiftScaleImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Shift: " << m_Shift << std::endl;
os << indent << "Scale: " << m_Scale << std::endl;
os << indent << "Computed values follow:" << std::endl;
os << indent << "UnderflowCount: " << m_UnderflowCount << std::endl;
os << indent << "OverflowCount: " << m_OverflowCount << std::endl;
}
} // end namespace itk
#endif
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