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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkNaryFunctorImageFilter.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkNaryFunctorImageFilter_txx
#define __itkNaryFunctorImageFilter_txx
#include "itkNaryFunctorImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkProgressReporter.h"
namespace itk
{
/**
* Constructor
*/
template <class TInputImage, class TOutputImage, class TFunction >
NaryFunctorImageFilter<TInputImage,TOutputImage,TFunction>
::NaryFunctorImageFilter()
{
// This number will be incremented each time an image
// is added over the two minimum required
this->SetNumberOfRequiredInputs( 2 );
this->InPlaceOff();
}
/**
* ThreadedGenerateData Performs the pixel-wise addition
*/
template <class TInputImage, class TOutputImage, class TFunction>
void
NaryFunctorImageFilter<TInputImage, TOutputImage, TFunction>
::ThreadedGenerateData( const OutputImageRegionType &outputRegionForThread,
int threadId)
{
const unsigned int numberOfInputImages =
static_cast< unsigned int >( this->GetNumberOfInputs() );
typedef ImageRegionConstIterator<TInputImage> ImageRegionConstIteratorType;
std::vector< ImageRegionConstIteratorType * > inputItrVector;
inputItrVector.reserve( numberOfInputImages );
// support progress methods/callbacks.
// count the number of inputs that are non-null
for (unsigned int i=0; i < numberOfInputImages; ++i)
{
InputImagePointer inputPtr =
dynamic_cast<TInputImage*>( ProcessObject::GetInput( i ) );
if (inputPtr)
{
inputItrVector.push_back( new ImageRegionConstIteratorType(inputPtr,outputRegionForThread) );
}
}
ProgressReporter progress(this, threadId,
outputRegionForThread.GetNumberOfPixels());
const unsigned int numberOfValidInputImages = inputItrVector.size();
if( numberOfValidInputImages==0 )
{
//No valid regions in the thread
//(and no region iterators to delete)
return;
}
NaryArrayType naryInputArray( numberOfValidInputImages );
OutputImagePointer outputPtr = this->GetOutput(0);
ImageRegionIterator<TOutputImage> outputIt(outputPtr, outputRegionForThread);
typename std::vector< ImageRegionConstIteratorType * >::iterator regionIterators;
const typename std::vector< ImageRegionConstIteratorType * >::const_iterator regionItEnd
= inputItrVector.end();
typename NaryArrayType::iterator arrayIt;
while( !outputIt.IsAtEnd() )
{
arrayIt = naryInputArray.begin();
regionIterators = inputItrVector.begin();
while ( regionIterators != regionItEnd )
{
*arrayIt++ = (*regionIterators)->Get();
++(*(*regionIterators));
++regionIterators;
}
outputIt.Set( m_Functor( naryInputArray ) );
++outputIt;
progress.CompletedPixel();
}
// Free memory
regionIterators = inputItrVector.begin();
while ( regionIterators != regionItEnd )
{
delete (*regionIterators++);
}
}
} // end namespace itk
#endif
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