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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 itkCheckerBoardImageFilter_hxx
#define itkCheckerBoardImageFilter_hxx
#include "itkCheckerBoardImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkObjectFactory.h"
#include "itkProgressReporter.h"
namespace itk
{
/**
* Initialize new instance
*/
template< typename TImage >
CheckerBoardImageFilter< TImage >
::CheckerBoardImageFilter()
{
m_CheckerPattern.Fill(4);
}
/**
* Print out a description of self
*
* \todo Add details about this class
*/
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;
}
/**
* Connect one of the operands for checkerboard operation
*/
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 ) );
}
/**
* Connect one of the operands for checkerboard operation
*/
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 ) );
}
/**
* ThreadedGenerateData
*/
template< typename TImage >
void
CheckerBoardImageFilter< TImage >
::ThreadedGenerateData(
const ImageRegionType & outputRegionForThread, ThreadIdType threadId)
{
itkDebugMacro(<< "Actually executing");
// 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.
typedef ImageRegionIteratorWithIndex< OutputImageType > OutputIterator;
typedef ImageRegionConstIteratorWithIndex< InputImageType > InputIterator;
OutputIterator outItr(outputPtr, outputRegionForThread);
InputIterator in1Itr(input1Ptr, outputRegionForThread);
InputIterator in2Itr(input2Ptr, outputRegionForThread);
outItr.GoToBegin();
in1Itr.GoToBegin();
in2Itr.GoToBegin();
// Support for progress methods/callbacks
ProgressReporter progress( this, threadId,
outputRegionForThread.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];
}
typedef typename InputImageType::PixelType PixelType;
typedef typename InputImageType::IndexType 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);
progress.CompletedPixel();
++outItr;
++in1Itr;
++in2Itr;
}
}
} // end namespace itk
#endif
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