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/** \file     ContextModel3DBuffer.h
    \brief    context model 3D buffer class (header)
*/

#ifndef _HM_CONTEXT_MODEL_3DBUFFER_H_
#define _HM_CONTEXT_MODEL_3DBUFFER_H_

#include <stdio.h>
#include <assert.h>
#include <memory.h>

#include "CommonDef.h"
#include "ContextModel.h"

//! \ingroup TLibCommon
//! \{

// ====================================================================================================================
// Class definition
// ====================================================================================================================

/// context model 3D buffer class
class ContextModel3DBuffer
{
protected:
  ContextModel* m_contextModel; ///< array of context models
  const UInt    m_sizeX;        ///< X size of 3D buffer
  const UInt    m_sizeXY;       ///< X times Y size of 3D buffer
  const UInt    m_sizeXYZ;      ///< total size of 3D buffer
  
public:
  ContextModel3DBuffer  ( UInt uiSizeZ, UInt uiSizeY, UInt uiSizeX, ContextModel *basePtr, Int &count );
  ~ContextModel3DBuffer () {}
  
  // access functions
  ContextModel& get( UInt uiZ, UInt uiY, UInt uiX )
  {
    return  m_contextModel[ uiZ * m_sizeXY + uiY * m_sizeX + uiX ];
  }
  ContextModel* get( UInt uiZ, UInt uiY )
  {
    return &m_contextModel[ uiZ * m_sizeXY + uiY * m_sizeX ];
  }
  ContextModel* get( UInt uiZ )
  {
    return &m_contextModel[ uiZ * m_sizeXY ];
  }
  
  // initialization & copy functions
  Void initBuffer( SliceType eSliceType, Int iQp, UChar* ctxModel );          ///< initialize 3D buffer by slice type & QP
  
  UInt calcCost( SliceType sliceType, Int qp, UChar* ctxModel );      ///< determine cost of choosing a probability table based on current probabilities
  /** copy from another buffer
   * \param src buffer to copy from
   */
  Void copyFrom( ContextModel3DBuffer* src )
  {
    assert( m_sizeXYZ == src->m_sizeXYZ );
    ::memcpy( m_contextModel, src->m_contextModel, sizeof(ContextModel) * m_sizeXYZ );
  }
};

//! \}

#endif // _HM_CONTEXT_MODEL_3DBUFFER_H_