ColorStack.hh

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\*===========================================================================*/



//=============================================================================
//
//  CLASS ColorStack
//
//=============================================================================

#ifndef ACG_COLORSTACK_HH
#define ACG_COLORSTACK_HH


//== INCLUDES =================================================================

#include <vector>

#include <ACG/GL/gl.hh>
#include <ACG/Math/VectorT.hh>
#include "ColorTranslator.hh"


//== NAMESPACES ===============================================================


namespace ACG {


//== CLASS DEFINITION =========================================================


class ACGDLLEXPORT ColorStack
{
public:
   
  ColorStack();
  ~ColorStack();

  
  void initialize();
  bool initialized() const { return initialized_; }

  bool setMaximumIndex (unsigned int _idx);

  void setIndex (unsigned int _idx);

  Vec4uc getIndexColor (unsigned int _idx);

  void pushIndex (unsigned int _idx);

  void popIndex ();

  std::vector<unsigned int> colorToStack (Vec4uc _rgba) const;

  unsigned int freeIndicies () const;

  bool error () const { return error_ && initialized_; };

  unsigned int currentIndex () const;

private:

  // Internal class used realize the color stack

  class Node {
    public:
      Node (unsigned int _idx, Node *_parent, ColorTranslator *_ct);
      ~Node ();

      bool setMaximumIndex (unsigned int _idx);

      bool setIndex (unsigned int _idx) const;

      bool getIndexColor (unsigned int _idx, Vec4uc &_rgba) const;

      Node * pushIndex (unsigned int _idx);

      Node * popIndex ();

      void colorToStack (std::vector<unsigned int> &_stack, unsigned int _index);

      unsigned int startIndex () { return startIdx_; };
      unsigned int endIndex () { return endIdx_; };
      unsigned int colorIndex () { return colorStartIdx_; };

    private:
      Node                *parent_;
      unsigned int        index_;
      ColorTranslator     *translator_;
      std::vector<Node *> nodes_;

      unsigned int startIdx_;
      unsigned int endIdx_;
      unsigned int colorStartIdx_;
      unsigned int colorEndIdx_;

  };

  bool            initialized_;
  ColorTranslator translator_;
  Node            *root_;
  Node            *currentNode_;
  bool            error_;
};


//=============================================================================
} // namespace ACG
//=============================================================================
#endif // ACG_COLORSTACK_HH defined
//=============================================================================