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/** \file     AdaptiveLoopFilter.h
    \brief    adaptive loop filter class (header)
*/

#pragma once

#include "CommonDef.h"

#include "Unit.h"
#include "UnitTools.h"

//! \ingroup CommonLib
//! \{

namespace vvenc {

using namespace x86_simd;

struct AlfClassifier
{
  AlfClassifier() {}
  AlfClassifier( uint8_t cIdx, uint8_t tIdx )
    : classIdx( cIdx ), transposeIdx( tIdx )
  {
  }

  uint8_t classIdx;
  uint8_t transposeIdx;
};

enum Direction
{
  HOR,
  VER,
  DIAG0,
  DIAG1,
  NUM_DIRECTIONS
};

class AdaptiveLoopFilter
{
public:
  static inline int clipALF(const int clip, const short ref, const short val0, const short val1)
  {
    return Clip3<int>(-clip, +clip, val0-ref) + Clip3<int>(-clip, +clip, val1-ref);
  }

  static inline int clipALF(const int clip, const int val0, const int val1)
  {
    return Clip3<int>(-clip, +clip, val0) + Clip3<int>(-clip, +clip, val1);
  }

  static constexpr int AlfNumClippingValues      = 4;
  static constexpr int MaxAlfNumClippingValues   = 4;
  static constexpr int m_NUM_BITS                = 8;
  static constexpr int m_CLASSIFICATION_BLK_SIZE = 128;  //non-normative, local buffer size
  static constexpr int m_ALF_UNUSED_CLASSIDX     = 255;
  static constexpr int m_ALF_UNUSED_TRANSPOSIDX  = 255;

  AdaptiveLoopFilter();
  virtual ~AdaptiveLoopFilter() {}
  void        reconstructCoeffAPSs    ( CodingStructure& cs, bool luma, bool chroma, bool isRdo);
  void        reconstructCoeffFixedAPSs(CodingStructure& cs, bool luma, bool chroma, bool isRdo);
  void        reconstructCoeff(AlfParam& alfParam, ChannelType channel, const bool isRdo, const bool isRedo = false);
  void        create                  ( const int picWidth, const int picHeight, const ChromaFormat format, const int maxCUWidth, const int maxCUHeight, const int inputBitDepth[MAX_NUM_CH] );
  void        destroy                 ();
  static void deriveClassificationBlk ( AlfClassifier *classifier,
                                       const CPelBuf& srcLuma, const Area& blkDst, const Area& blk, const int shift,
                                       const int vbCTUHeight, int vbPos);
  void        deriveClassification    ( AlfClassifier* classifier, const CPelBuf& srcLuma, const Area& blkDst, const Area& blk );
  template<AlfFilterType filtTypeCcAlf>
  static void filterBlkCcAlf         ( const PelBuf &dstBuf, const CPelUnitBuf &recSrc, const Area &blkDst, const Area &blkSrc,
                                       const ComponentID compId, const int16_t *filterCoeff, const ClpRngs &clpRngs,
                                       CodingStructure &cs, int vbCTUHeight, int vbPos);

  template<AlfFilterType filtType>
  static void filterBlk              ( const AlfClassifier *classifier, const PelUnitBuf& recDst, const CPelUnitBuf& recSrc,
                                       const Area& blkDst, const Area& blk, const ComponentID compId, const short *filterSet,
                                       const short *fClipSet, const ClpRng &clpRng, const CodingStructure &cs, const int vbCTUHeight,
                                       int vbPos);
  void (*m_deriveClassificationBlk) ( AlfClassifier *classifier, const CPelBuf& srcLuma, const Area& blkDst, const Area& blk, const int shift, const int vbCTUHeight, int vbPos);
  void (*m_filterCcAlf)             ( const PelBuf &dstBuf, const CPelUnitBuf &recSrc, const Area &blkDst, const Area &blkSrc,
                                      const ComponentID compId, const int16_t *filterCoeff, const ClpRngs &clpRngs,
                                      CodingStructure &cs, int vbCTUHeight, int vbPos);
  CcAlfFilterParam &getCcAlfFilterParam() { return m_ccAlfFilterParam; }
  uint8_t* getCcAlfControlIdc       ( const ComponentID compID)   { return m_ccAlfFilterControl[compID-1]; }
  void (*m_filter5x5Blk[2])         ( const AlfClassifier *classifier, const PelUnitBuf& recDst, const CPelUnitBuf& recSrc,
                                     const Area& blkDst, const Area& blk, const ComponentID compId, const short *filterSet,
                                     const short *fClipSet, const ClpRng &clpRng, const CodingStructure &cs, const int vbCTUHeight,
                                     int vbPos);
  void (*m_filter7x7Blk[2])        ( const AlfClassifier *classifier, const PelUnitBuf& recDst, const CPelUnitBuf& recSrc,
                                     const Area& blkDst, const Area& blk, const ComponentID compId, const short *filterSet,
                                     const short *fClipSet, const ClpRng &clpRng, const CodingStructure &cs, const int vbCTUHeight,
                                     int vbPos);

#ifdef TARGET_SIMD_X86
  void initAdaptiveLoopFilterX86();
  template <X86_VEXT vext>
  void _initAdaptiveLoopFilterX86();
#endif

protected:
  bool isCrossedByVirtualBoundaries( const CodingStructure& cs, const int xPos, const int yPos, const int width, const int height, bool& clipTop, bool& clipBottom, bool& clipLeft, bool& clipRight, int& numHorVirBndry, int& numVerVirBndry, int horVirBndryPos[], int verVirBndryPos[], int& rasterSliceAlfPad );
 
  static const int             m_classToFilterMapping[NUM_FIXED_FILTER_SETS][MAX_NUM_ALF_CLASSES];
  static const int             m_fixedFilterSetCoeff[ALF_FIXED_FILTER_NUM][MAX_NUM_ALF_LUMA_COEFF];
  short                        m_fixedFilterSetCoeffDec[NUM_FIXED_FILTER_SETS][MAX_NUM_ALF_CLASSES * MAX_NUM_ALF_LUMA_COEFF];
  short                        m_coeffApsLuma[ALF_CTB_MAX_NUM_APS][MAX_NUM_ALF_LUMA_COEFF * MAX_NUM_ALF_CLASSES];
  short                        m_clippApsLuma[ALF_CTB_MAX_NUM_APS][MAX_NUM_ALF_LUMA_COEFF * MAX_NUM_ALF_CLASSES];
  short                        m_clipDefault[MAX_NUM_ALF_CLASSES * MAX_NUM_ALF_LUMA_COEFF];
  bool                         m_created = false;
  short                        m_chromaCoeffFinal[VVENC_MAX_NUM_ALF_ALTERNATIVES_CHROMA][MAX_NUM_ALF_LUMA_COEFF];
  AlfParam*                    m_alfParamChroma;
  Pel                          m_alfClippingValues[MAX_NUM_CH][MaxAlfNumClippingValues];
  AlfFilterShape               m_filterShapesCcAlf[2];
  AlfFilterShape               m_filterShapes[MAX_NUM_CH];
  AlfClassifier*               m_classifier;
  short                        m_coeffFinal[MAX_NUM_ALF_CLASSES * MAX_NUM_ALF_LUMA_COEFF];
  short                        m_clippFinal[MAX_NUM_ALF_CLASSES * MAX_NUM_ALF_LUMA_COEFF];
  short                        m_chromaClippFinal[VVENC_MAX_NUM_ALF_ALTERNATIVES_CHROMA][MAX_NUM_ALF_LUMA_COEFF];
  short                        m_coeffApsLumaFixed[ALF_CTB_MAX_NUM_APS][MAX_NUM_ALF_LUMA_COEFF * MAX_NUM_ALF_CLASSES];
  short                        m_clippApsLumaFixed[ALF_CTB_MAX_NUM_APS][MAX_NUM_ALF_LUMA_COEFF * MAX_NUM_ALF_CLASSES];
  short                        m_chromaCoeffFinalFixed[VVENC_MAX_NUM_ALF_ALTERNATIVES_CHROMA][MAX_NUM_ALF_LUMA_COEFF];
  short                        m_chromaClippFinalFixed[VVENC_MAX_NUM_ALF_ALTERNATIVES_CHROMA][MAX_NUM_ALF_LUMA_COEFF];
  uint8_t*                     m_ctuEnableFlag[MAX_NUM_COMP];
  uint8_t*                     m_ctuAlternative[MAX_NUM_COMP];
  PelStorage                   m_tempBuf;
  PelStorage                   m_tempBuf2;
  int                          m_inputBitDepth[MAX_NUM_CH];
  int                          m_picWidth;
  int                          m_picHeight;
  int                          m_maxCUWidth;
  int                          m_maxCUHeight;
  uint32_t                     m_numCTUsInWidth;
  uint32_t                     m_numCTUsInHeight;
  uint32_t                     m_numCTUsInPic;
  int                          m_alfVBLumaPos;
  int                          m_alfVBChmaPos;
  int                          m_alfVBLumaCTUHeight;
  int                          m_alfVBChmaCTUHeight;
  ChromaFormat                 m_chromaFormat;

public :
  static constexpr int   m_scaleBits = 7; // 8-bits
  CcAlfFilterParam       m_ccAlfFilterParam;
  uint8_t*               m_ccAlfFilterControl[2];

};

} // namespace vvenc

//! \}
