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/** \file     SampleAdaptiveOffset.h

    \brief    sample adaptive offset class (header)

*/

#pragma once

#include "CommonDef.h"

#include "Unit.h"

#include "Reshape.h"

#include <array>

namespace vvdec

{

#  define SAO_NUM_OFFSETS 4                             /* number of SAO offset values */

#  define SAO_EO_NUM_CATEGORIES ( SAO_NUM_OFFSETS + 1 ) /* number of different eo categories */

template<typename T> static inline int sgn( T val )

{

  return ( T( 0 ) < val ) - ( val < T( 0 ) );

}

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

// Constants

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

#define MAX_SAO_TRUNCATED_BITDEPTH     10

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

// Class definition

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

class SampleAdaptiveOffset

{

public:

  SampleAdaptiveOffset( bool enableOpt = true );

  ~SampleAdaptiveOffset();

  void create( int picWidth, int picHeight, ChromaFormat format, uint32_t maxCUWidth, uint32_t maxCUHeight, uint32_t maxCUDepth, uint32_t bitShift, PelUnitBuf& unitBuf );

  void destroy();

//  void SAOProcess( CodingStructure& cs );

  void SAOProcessCTU    ( CodingStructure& cs, const UnitArea& ctuArea );

  void SAOProcessCTULine( CodingStructure& cs, const UnitArea& lineArea );

  void SAOPrepareCTULine( CodingStructure& cs, const UnitArea& lineArea );

  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; }

  static void offsetBlock_core( const int            channelBitDepth,

                                const ClpRng&        clpRng,

                                int                  typeIdx,

                                int*                 offset,

                                int                  startIdx,

                                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,

                                std::vector<int8_t>* m_signLineBuf1,

                                std::vector<int8_t>* m_signLineBuf2,

                                bool                 isCtuCrossedByVirtualBoundaries,

                                int                  horVirBndryPos[],

                                int                  verVirBndryPos[],

                                int                  numHorVirBndry,

                                int                  numVerVirBndry );

  void ( *offsetBlock )( const int            channelBitDepth,

                         const ClpRng&        clpRng,

                         int                  typeIdx,

                         int*                 offset,

                         int                  startIdx,

                         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,

                         std::vector<int8_t>* m_signLineBuf1,

                         std::vector<int8_t>* m_signLineBuf2,

                         bool                 isCtuCrossedByVirtualBoundaries,

                         int                  horVirBndryPos[],

                         int                  verVirBndryPos[],

                         int                  numHorVirBndry,

                         int                  numVerVirBndry );

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 invertQuantOffsets     ( ComponentID compIdx, int typeIdc, int typeAuxInfo, int* dstOffsets, int* srcOffsets ) const;

  void reconstructBlkSAOParam ( SAOBlkParam& recParam, SAOBlkParam* mergeList[NUM_SAO_MERGE_TYPES] ) const;

  int  getMergeList           ( CodingStructure& cs, int ctuRsAddr, SAOBlkParam* mergeList[NUM_SAO_MERGE_TYPES] );

  void offsetCTU              ( const UnitArea& area, const CPelUnitBuf& src, PelUnitBuf& res, SAOBlkParam& saoblkParam, CodingStructure& cs, std::vector<int8_t> &signLineBuf1, std::vector<int8_t> &signLineBuf2 );

  static bool isProcessDisabled( int xPos, int yPos, int numVerVirBndry, int numHorVirBndry, int verVirBndryPos[], int horVirBndryPos[] );

  Reshape* m_pcReshape;

#if defined(TARGET_SIMD_X86)  && ENABLE_SIMD_OPT_SAO

  void initSampleAdaptiveOffsetX86();

  template <X86_VEXT vext>

  void _initSampleAdaptiveOffsetX86();

#endif

#if defined( TARGET_SIMD_ARM ) && ENABLE_SIMD_OPT_SAO

  void initSampleAdaptiveOffsetARM();

  template<ARM_VEXT vext>

  void _initSampleAdaptiveOffsetARM();

#endif

protected:

  uint32_t   m_offsetStepLog2;   // offset step

  uint32_t   m_numberOfComponents;

  PelUnitBuf m_tempBuf;

};

}