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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkVectorIndexSelectionCastImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-27 11:36:41 $
Version: $Revision: 1.14 $
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 __itkVectorIndexSelectionCastImageFilter_h
#define __itkVectorIndexSelectionCastImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
namespace itk
{
namespace Functor {
template< class TInput, class TOutput>
class VectorIndexSelectionCast
{
public:
VectorIndexSelectionCast() {m_Index = 0;}
~VectorIndexSelectionCast() {}
unsigned int GetIndex() const { return m_Index; }
void SetIndex(unsigned int i) { m_Index = i; }
bool operator!=( const VectorIndexSelectionCast & other ) const
{
if( m_Index != other.m_Index )
{
return true;
}
return false;
}
bool operator==( const VectorIndexSelectionCast & other ) const
{
return !(*this != other);
}
inline TOutput operator()( const TInput & A )
{
return static_cast<TOutput>( A[m_Index] );
}
private:
unsigned int m_Index;
};
}
/** \class VectorIndexSelectionCastImageFilter
*
* \brief Extracts the selected index of the vector that is the input
* pixel type
*
* This filter is templated over the input image type and
* output image type.
*
* The filter expect the input image pixel type to be a vector and
* the output image pixel type to be a scalar. The only requirement on
* the type used for representing the vector is that it must provide an
* operator[].
*
* \ingroup IntensityImageFilters Multithreaded
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT VectorIndexSelectionCastImageFilter :
public
UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::VectorIndexSelectionCast< typename TInputImage::PixelType,
typename TOutputImage::PixelType> >
{
public:
/** Standard class typedefs. */
typedef VectorIndexSelectionCastImageFilter Self;
typedef UnaryFunctorImageFilter<TInputImage,TOutputImage,
Functor::VectorIndexSelectionCast< typename TInputImage::PixelType,
typename TOutputImage::PixelType> > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(VectorIndexSelectionCastImageFilter,
UnaryFunctorImageFilter);
/** Get/Set methods for the index */
void SetIndex(unsigned int i)
{
if (i != this->GetFunctor().GetIndex())
{
this->GetFunctor().SetIndex(i);
this->Modified();
}
}
unsigned int GetIndex(void) const
{
return this->GetFunctor().GetIndex();
}
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputHasNumericTraitsCheck,
(Concept::HasNumericTraits<typename TInputImage::PixelType::ValueType>));
/** End concept checking */
#endif
protected:
VectorIndexSelectionCastImageFilter() {}
virtual ~VectorIndexSelectionCastImageFilter() {}
virtual void BeforeThreadedGenerateData()
{
const unsigned int index = this->GetIndex();
const TInputImage * image = this->GetInput();
const unsigned int numberOfRunTimeComponents =
image->GetNumberOfComponentsPerPixel();
typedef typename TInputImage::PixelType PixelType;
typedef typename itk::NumericTraits< PixelType >::RealType
PixelRealType;
typedef typename itk::NumericTraits< PixelType >::ScalarRealType
PixelScalarRealType;
const unsigned int numberOfCompileTimeComponents =
sizeof( PixelRealType ) / sizeof( PixelScalarRealType );
unsigned int numberOfComponents = numberOfRunTimeComponents;
if( numberOfCompileTimeComponents > numberOfRunTimeComponents )
{
numberOfComponents = numberOfCompileTimeComponents;
}
if( index >= numberOfComponents )
{
itkExceptionMacro(
<< "Selected index = " << index
<< " is greater than the number of components = "
<< numberOfComponents );
}
}
private:
VectorIndexSelectionCastImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
#endif
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