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#ifndef SCALARIMAGEWRAPPERCOMMONREPRESENTATION_H
#define SCALARIMAGEWRAPPERCOMMONREPRESENTATION_H
#include "ImageWrapperBase.h"
namespace itk
{
template<class TIn, class TOut> class CastImageFilter;
}
/**
* The parent class for the hierarchy of ScalarImageWrapper policy classes
* that allow the internal image in the ScalarImageWrapper to be cast to
* an itk::Image in some common format. The resust of casting to a common
* format can be used in downstream pipelines without needing to know what
* the format of the internal image was
*/
template <class TOutputPixel>
class AbstractScalarImageWrapperCommonRepresentation
{
public:
typedef itk::Image<TOutputPixel, 3> OutputImageType;
/**
* Export the image to a common format
* @see ScalarImageWrapperBase::GetCommonFormatImage
*/
virtual OutputImageType *GetOutput(ScalarImageWrapperBase::ExportChannel channel) = 0;
};
/**
* This implementation of the policy is for use by ScalarImageWrappers whose
* internal image is a plain itk::Image of TOutputPixel type. No casting takes
* place in that case, and the output image simply shares the pixel container
* with the image stored in the ScalarImageWrapper.
*/
template <class TOutputPixel, class TWrapperTraits>
class InPlaceScalarImageWrapperCommonRepresentation
: public AbstractScalarImageWrapperCommonRepresentation<TOutputPixel>
{
public:
typedef AbstractScalarImageWrapperCommonRepresentation<TOutputPixel> Superclass;
typedef typename Superclass::OutputImageType OutputImageType;
typedef typename TWrapperTraits::ImageType InputImageType;
InPlaceScalarImageWrapperCommonRepresentation();
~InPlaceScalarImageWrapperCommonRepresentation();
OutputImageType *GetOutput(ScalarImageWrapperBase::ExportChannel channel);
void UpdateInputImage(InputImageType *image);
private:
SmartPtr<OutputImageType> m_Image;
};
/**
* This implementation of the policy uses an itk cast filter. This is used when
* the image stored in the ScalarImageWrapper does not have the type needed for
* export.
*/
template <class TOutputPixel, class TWrapperTraits>
class CastingScalarImageWrapperCommonRepresentation
: public AbstractScalarImageWrapperCommonRepresentation<TOutputPixel>
{
public:
typedef AbstractScalarImageWrapperCommonRepresentation<TOutputPixel> Superclass;
typedef typename Superclass::OutputImageType OutputImageType;
typedef typename TWrapperTraits::ImageType InputImageType;
CastingScalarImageWrapperCommonRepresentation();
~CastingScalarImageWrapperCommonRepresentation();
OutputImageType *GetOutput(ScalarImageWrapperBase::ExportChannel channel);
void UpdateInputImage(InputImageType *image);
private:
typedef itk::CastImageFilter<InputImageType, OutputImageType> CastFilterType;
typedef SmartPtr<CastFilterType> CastFilterPointer;
// Array of casting filters
std::vector<CastFilterPointer> m_CastFilter;
};
/**
* A null implementation of the above policy, intended for classes that do not
* need to be cast to any output type. The representation always returns NULL
* in GetOutput().
*/
template <class TOutputPixel, class TWrapperTraits>
class NullScalarImageWrapperCommonRepresentation
: public AbstractScalarImageWrapperCommonRepresentation<TOutputPixel>
{
public:
typedef AbstractScalarImageWrapperCommonRepresentation<TOutputPixel> Superclass;
typedef typename Superclass::OutputImageType OutputImageType;
typedef typename TWrapperTraits::ImageType InputImageType;
OutputImageType *GetOutput(ScalarImageWrapperBase::ExportChannel channel)
{ return NULL; }
void UpdateInputImage(InputImageType *) {};
};
#endif // SCALARIMAGEWRAPPERCOMMONREPRESENTATION_H
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