MeVis/Foundation/Sources/ML/include/mlPageIDIterator.h

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// **InsertLicense** code
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
#ifndef __mlPageIDIterator_H
#define __mlPageIDIterator_H

// ML-includes
#ifndef __mlInitSystemML_H
#include "mlInitSystemML.h"
#endif

#include "mlPagedImage.h"

ML_START_NAMESPACE

//-------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------
class PageIDIterator
{
  
public:
  
  MLEXPORT PageIDIterator();
  
  MLEXPORT PageIDIterator(PagedImage& image, const SubImageBox& box);
  
  MLEXPORT ~PageIDIterator();
  
  MLEXPORT void setup(PagedImage& image, const SubImageBox& box);
  
  inline MLint getNextPageID() {
    MLint result = _currentPageId;
    
    // in case of being the last pageid, we stop incrementing
    if (result==_lastPageId) {
      return result;
    }
    
    // increment the page id in all 6 dimensions, if overflow occurs:
    _currentPageId++;
    _currentPosition.x++;
    if (_currentPosition.x >= _pageBoxExtent.x) {
      _currentPosition.x = 0;
      _currentPageId -= _pageBoxExtent.x;
      
      _currentPageId += _pageStride.y;
      _currentPosition.y++;
      if (_currentPosition.y >= _pageBoxExtent.y) {
        _currentPosition.y = 0;
        _currentPageId -= _pageBoxExtent.y * _pageStride.y;
        
        _currentPageId += _pageStride.z;
        _currentPosition.z++;
        if (_currentPosition.z >= _pageBoxExtent.z) {
          _currentPosition.z = 0;
          _currentPageId -= _pageBoxExtent.z * _pageStride.z;
          
          _currentPageId += _pageStride.c;
          _currentPosition.c++;
          if (_currentPosition.c >= _pageBoxExtent.c) {
            _currentPosition.c = 0;
            _currentPageId -= _pageBoxExtent.c * _pageStride.c;
            
            _currentPageId += _pageStride.t;
            _currentPosition.t++;
            if (_currentPosition.t >= _pageBoxExtent.t) {
              _currentPosition.t = 0;
              _currentPageId -= _pageBoxExtent.t * _pageStride.t;
              
              _currentPageId += _pageStride.u;
              _currentPosition.u++;
            }
          }
        }
      }
    }
    return result;
  }
  
  inline MLint getNumPages() const { return _numberOfPages; }
  
private:
  ImageVector _pageStride;
  ImageVector _currentPosition;
  ImageVector _pageBoxExtent;
  MLint  _currentPageId;
  MLint  _lastPageId;
  MLint  _numberOfPages;
  
};

ML_END_NAMESPACE

#endif //of __mlPageIDIterator_H