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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
// ====================================================================================================================

static constexpr int MAX_SAO_TRUNCATED_BITDEPTH = 10;

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

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 setReshaper(Reshape *p) { m_pcReshape = p; }
  void destroy();

  static int getMaxOffsetQVal(const int channelBitDepth)
  {
    return (1 << (std::min<int>(channelBitDepth, MAX_SAO_TRUNCATED_BITDEPTH) - 5)) - 1;
  }   // Table 9-32, inclusive

protected:
  using MergeBlkParams = EnumArray<SAOBlkParam *, SAOModeMergeTypes>;

  void deriveLoopFilterBoundaryAvailability(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, SAOModeNewTypes typeIdx, int *offset,
                   const Pel *srcBlk, Pel *resBlk, ptrdiff_t srcStride, ptrdiff_t 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, SAOModeNewTypes typeIdc, int typeAuxInfo, int *dstOffsets,
                          int *srcOffsets);
  void reconstructBlkSAOParam(SAOBlkParam &recParam, MergeBlkParams &mergeList);
  int  getMergeList(CodingStructure &cs, int ctuRsAddr, SAOBlkParam *blkParams, MergeBlkParams &mergeList);
  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);
  bool isProcessDisabled(int xPos, int yPos, int numVerVirBndry, int numHorVirBndry, int verVirBndryPos[],
                         int horVirBndryPos[])
  {
    bool disabledFlag = false;
    for (int i = 0; i < numVerVirBndry; i++)
    {
      if ((xPos == verVirBndryPos[i]) || (xPos == verVirBndryPos[i] - 1))
      {
        disabledFlag = true;
        break;
      }
    }
    for (int i = 0; i < numHorVirBndry; i++)
    {
      if ((yPos == horVirBndryPos[i]) || (yPos == horVirBndryPos[i] - 1))
      {
        disabledFlag = true;
        break;
      }
    }
    return disabledFlag;
  }
  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