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/** \file     SampleAdaptiveOffset.h
    \brief    sample adaptive offset class (header)
*/

#ifndef __SAMPLEADAPTIVEOFFSET__
#define __SAMPLEADAPTIVEOFFSET__

#include "CommonDef.h"
#include "Unit.h"
#include "Reshape.h"
//! \ingroup CommonLib
//! \{


// ====================================================================================================================
// Constants
// ====================================================================================================================

#define MAX_SAO_TRUNCATED_BITDEPTH     10

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

template <typename T> int sgn(T val)
{
  return (T(0) < val) - (val < T(0));
}

class SampleAdaptiveOffset
{
public:
  SampleAdaptiveOffset();
  virtual ~SampleAdaptiveOffset();
  void SAOProcess( CodingStructure& cs, SAOBlkParam* saoBlkParams
                   );
  void create( int picWidth, int picHeight, ChromaFormat format, uint32_t maxCUWidth, uint32_t maxCUHeight, uint32_t maxCUDepth, uint32_t lumaBitShift, uint32_t chromaBitShift );
  void destroy();
  static int getMaxOffsetQVal(const int channelBitDepth) { return (1<<(std::min<int>(channelBitDepth,MAX_SAO_TRUNCATED_BITDEPTH)-5))-1; } //Table 9-32, inclusive
  void setReshaper(Reshape * p) { m_pcReshape = p; }
protected:
  void deriveLoopFilterBoundaryAvailibility(CodingStructure& cs, const Position &pos,
    bool& isLeftAvail,
    bool& isRightAvail,
    bool& isAboveAvail,
    bool& isBelowAvail,
    bool& isAboveLeftAvail,
    bool& isAboveRightAvail,
    bool& isBelowLeftAvail,
    bool& isBelowRightAvail
    ) const;

  void offsetBlock(const int channelBitDepth, const ClpRng& clpRng, int typeIdx, int* offset, const Pel* srcBlk, Pel* resBlk, int srcStride, int resStride,  int width, int height
                  , bool isLeftAvail, bool isRightAvail, bool isAboveAvail, bool isBelowAvail, bool isAboveLeftAvail, bool isAboveRightAvail, bool isBelowLeftAvail, bool isBelowRightAvail
                  , bool isCtuCrossedByVirtualBoundaries, int horVirBndryPos[], int verVirBndryPos[], int numHorVirBndry, int numVerVirBndry
    );
  void invertQuantOffsets(ComponentID compIdx, int typeIdc, int typeAuxInfo, int* dstOffsets, int* srcOffsets);
  void reconstructBlkSAOParam(SAOBlkParam& recParam, SAOBlkParam* mergeList[NUM_SAO_MERGE_TYPES]);
  int  getMergeList(CodingStructure& cs, int ctuRsAddr, SAOBlkParam* blkParams, SAOBlkParam* mergeList[NUM_SAO_MERGE_TYPES]);
  void offsetCTU(const UnitArea& area, const CPelUnitBuf& src, PelUnitBuf& res, SAOBlkParam& saoblkParam, CodingStructure& cs);
  void xReconstructBlkSAOParams(CodingStructure& cs, SAOBlkParam* saoBlkParams);
  bool isCrossedByVirtualBoundaries(const int xPos, const int yPos, const int width, const int height, int& numHorVirBndry, int& numVerVirBndry, int horVirBndryPos[], int verVirBndryPos[], const PicHeader* picHeader);
  inline bool isProcessDisabled(int xPos, int yPos, int numVerVirBndry, int numHorVirBndry, int verVirBndryPos[], int horVirBndryPos[])
  {
    bool bDisabledFlag = false;
    for (int i = 0; i < numVerVirBndry; i++)
    {
      if ((xPos == verVirBndryPos[i]) || (xPos == verVirBndryPos[i] - 1))
      {
        bDisabledFlag = true;
        break;
      }
    }
    for (int i = 0; i < numHorVirBndry; i++)
    {
      if ((yPos == horVirBndryPos[i]) || (yPos == horVirBndryPos[i] - 1))
      {
        bDisabledFlag = true;
        break;
      }
    }
    return bDisabledFlag;
  }
  Reshape* m_pcReshape;
protected:
  uint32_t m_offsetStepLog2[MAX_NUM_COMPONENT]; //offset step
  PelStorage m_tempBuf;
  uint32_t m_numberOfComponents;

  std::vector<int8_t> m_signLineBuf1;
  std::vector<int8_t> m_signLineBuf2;
private:
  bool m_picSAOEnabled[MAX_NUM_COMPONENT];
};

//! \}
#endif

