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#ifndef RLEImageScanlineConstIterator_h
#define RLEImageScanlineConstIterator_h
#include "RLEImageRegionConstIterator.h"
#include "itkImageScanlineIterator.h"
namespace itk
{
/** \class ImageScanlineConstIterator
* \brief A multi-dimensional iterator templated over image type that walks a
* region of pixels, scanline by scanline or in the direction of the
* fastest axis.
*/
template< typename TPixel, unsigned int VImageDimension, typename CounterType >
class ImageScanlineConstIterator<RLEImage<TPixel, VImageDimension, CounterType> >
:public ImageRegionConstIterator<RLEImage<TPixel, VImageDimension, CounterType> >
{
public:
/** Standard class typedef. */
typedef ImageScanlineConstIterator Self;
typedef ImageRegionConstIterator< RLEImage<TPixel, VImageDimension, CounterType> > Superclass;
/** Dimension of the image that the iterator walks. This constant is needed so
* functions that are templated over image iterator type (as opposed to
* being templated over pixel type and dimension) can have compile time
* access to the dimension of the image that the iterator walks. */
itkStaticConstMacro(ImageIteratorDimension, unsigned int, VImageDimension);
/**
* Index typedef support. While these were already typdef'ed in the superclass,
* they need to be redone here for this subclass to compile properly with gcc.
*/
/** Types inherited from the Superclass */
typedef typename Superclass::IndexType IndexType;
typedef typename Superclass::SizeType SizeType;
typedef typename Superclass::OffsetType OffsetType;
typedef typename Superclass::RegionType RegionType;
typedef typename Superclass::ImageType ImageType;
typedef typename Superclass::InternalPixelType InternalPixelType;
typedef typename Superclass::PixelType PixelType;
/** Run-time type information (and related methods). */
itkTypeMacro(ImageScanlineConstIterator, ImageRegionConstIterator);
/** Default constructor. Needed since we provide a cast constructor. */
ImageScanlineConstIterator()
:ImageRegionConstIterator< ImageType >() {}
/** Constructor establishes an iterator to walk a particular image and a
* particular region of that image. */
ImageScanlineConstIterator(const ImageType *ptr, const RegionType & region) :
ImageRegionConstIterator< ImageType >(ptr, region) {}
/** Constructor that can be used to cast from an ImageIterator to an
* ImageScanlineConstIterator. Many routines return an ImageIterator, but for a
* particular task, you may want an ImageScanlineConstIterator. Rather than
* provide overloaded APIs that return different types of Iterators, itk
* returns ImageIterators and uses constructors to cast from an
* ImageIterator to a ImageScanlineConstIterator. */
ImageScanlineConstIterator(const ImageIterator< ImageType > & it)
:ImageRegionConstIterator< ImageType >(it) {}
/** Constructor that can be used to cast from an ImageConstIterator to an
* ImageScanlineConstIterator. Many routines return an ImageIterator, but for a
* particular task, you may want an ImageScanlineConstIterator. Rather than
* provide overloaded APIs that return different types of Iterators, itk
* returns ImageIterators and uses constructors to cast from an
* ImageIterator to a ImageScanlineConstIterator. */
ImageScanlineConstIterator(const ImageConstIterator< ImageType > & it)
{ this->ImageRegionConstIterator< ImageType >::operator=(it); }
/** Go to the beginning pixel of the current line. */
void GoToBeginOfLine(void)
{
this->m_Index0 = this->m_BeginIndex0;
this->realIndex = 0;
this->segmentRemainder = (*this->rlLine)[this->realIndex].first;
}
/** Go to the past end pixel of the current line. */
void GoToEndOfLine(void)
{
this->m_Index0 = this->m_EndIndex0;
this->realIndex = this->rlLine->size() - 1;
this->segmentRemainder = 0;
}
/** Test if the index is at the end of line. */
inline bool IsAtEndOfLine(void)
{
return this->m_Index0 == this->m_EndIndex0;
}
/** Go to the next line. */
inline void NextLine(void)
{
++(this->bi);
if (!this->bi.IsAtEnd())
this->SetIndexInternal(this->m_BeginIndex0);
else
this->m_Index0 = this->m_BeginIndex0; //make this iterator at end too
}
/** Increment (prefix) along the scanline.
*
* If the iterator is at the end of the scanline ( one past the last
* valid element in the row ), then the results are undefined. Which
* means is may assert in debug mode or result in an undefined
* iterator which may have unknown consequences if used.
*/
Self& operator++()
{
itkAssertInDebugAndIgnoreInReleaseMacro(!this->IsAtEndOfLine());
this->m_Index0++;
this->segmentRemainder--;
if (this->segmentRemainder > 0)
return *this;
if (this->IsAtEndOfLine())
return *this;
this->realIndex++;
this->segmentRemainder = (*this->rlLine)[this->realIndex].first;
return *this;
}
/** Decrement (prefix) along the scanline.
*
*/
Self& operator--()
{
this->m_Index0--;
this->segmentRemainder++;
if (this->segmentRemainder <= (*this->rlLine)[this->realIndex].first)
return *this;
this->realIndex--;
this->segmentRemainder = 1;
return *this;
}
};
} // end namespace itk
#endif //RLEImageScanlineConstIterator_h
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