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/** \file     Mv.h

    \brief    motion vector class (header)

*/

#pragma once

#include "CommonDef.h"

namespace vvdec

{

class SPS;

class PPS;

struct Position;

struct Size;

//! \ingroup CommonLib

//! \{

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

// Class definition

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

enum MvPrecision

{

  MV_PRECISION_4PEL     = 0,      // 4-pel

  MV_PRECISION_INT      = 2,      // 1-pel, shift 2 bits from 4-pel

  MV_PRECISION_HALF     = 3,      // 1/2-pel

  MV_PRECISION_QUARTER  = 4,      // 1/4-pel (the precision of regular MV difference signaling), shift 4 bits from 4-pel

  MV_PRECISION_INTERNAL = 6,      // 1/16-pel (the precision of internal MV), shift 6 bits from 4-pel

};

/// basic motion vector class

class Mv

{

private:

  static const MvPrecision m_amvrPrecision[4];

  static const int mvClipPeriod = (1 << MV_BITS);

  static const int halMvClipPeriod = (1 << (MV_BITS - 1));

public:

  int   hor;     ///< horizontal component of motion vector

  int   ver;     ///< vertical component of motion vector

  // ------------------------------------------------------------------------------------------------------------------

  // constructors

  // ------------------------------------------------------------------------------------------------------------------

  Mv(                    ) : hor( 0    ), ver( 0    ) {}

  Mv( int iHor, int iVer ) : hor( iHor ), ver( iVer ) {}

  // ------------------------------------------------------------------------------------------------------------------

  // set

  // ------------------------------------------------------------------------------------------------------------------

  void  set       ( int iHor, int iVer)     { hor = iHor;  ver = iVer; }

  void  setHor    ( int i )                 { hor = i;                 }

  void  setVer    ( int i )                 { ver = i;                 }

  void  setZero   ()                        { hor = ver = 0;           }

  // ------------------------------------------------------------------------------------------------------------------

  // get

  // ------------------------------------------------------------------------------------------------------------------

  int   getHor    () const { return hor;          }

  int   getVer    () const { return ver;          }

  int   getAbsHor () const { return abs( hor );   }

  int   getAbsVer () const { return abs( ver );   }

  // ------------------------------------------------------------------------------------------------------------------

  // operations

  // ------------------------------------------------------------------------------------------------------------------

  const Mv& operator += ( const Mv& _rcMv )

  {

    hor += _rcMv.hor;

    ver += _rcMv.ver;

    return  *this;

  }

  const Mv& operator-= (const Mv& _rcMv)

  {

    hor -= _rcMv.hor;

    ver -= _rcMv.ver;

    return  *this;

  }

  const Mv& operator<<= (const int i)

  {

    hor *= 1<<i;

    ver *= 1<<i;

    return  *this;

  }

  const Mv& operator>>= ( const int i )

  {

    if (i != 0)

    {

      const int offset = (1 << (i - 1));

      hor = (hor + offset - (hor >= 0)) >> i;

      ver = (ver + offset - (ver >= 0)) >> i;

    }

    return  *this;

  }

  const Mv operator - ( const Mv& rcMv ) const

  {

    return Mv( hor - rcMv.hor, ver - rcMv.ver );

  }

  const Mv operator + ( const Mv& rcMv ) const

  {

    return Mv( hor + rcMv.hor, ver + rcMv.ver );

  }

  bool operator== ( const Mv& rcMv ) const

  {

    return ( hor == rcMv.hor && ver == rcMv.ver );

  }

  bool operator!= ( const Mv& rcMv ) const

  {

    return !( *this == rcMv );

  }

  const Mv scaleMv( int iScale ) const

  {

    const int mvx = Clip3( -131072, 131071, (iScale * getHor() + 128 - (iScale * getHor() >= 0)) >> 8);

    const int mvy = Clip3( -131072, 131071, (iScale * getVer() + 128 - (iScale * getVer() >= 0)) >> 8);

    return Mv( mvx, mvy );

  }

  void changePrecision(const MvPrecision& src, const MvPrecision& dst)

  {

    const int shift = (int)dst - (int)src;

    if (shift >= 0)

    {

      *this <<= shift;

    }

    else

    {

      const int rightShift = -shift;

      const int nOffset = 1 << (rightShift - 1);

      hor = hor >= 0 ? (hor + nOffset - 1) >> rightShift : (hor + nOffset) >> rightShift;

      ver = ver >= 0 ? (ver + nOffset - 1) >> rightShift : (ver + nOffset) >> rightShift;

    }

  }

  void changePrecisionAmvr(const int amvr, const MvPrecision& dst)

  {

    changePrecision(m_amvrPrecision[amvr], dst);

  }

  void roundToPrecision(const MvPrecision& src, const MvPrecision& dst)

  {

    changePrecision(src, dst);

    changePrecision(dst, src);

  }

  void roundToAmvrSignalPrecision(const MvPrecision& src, const int amvr)

  {

    roundToPrecision(src, m_amvrPrecision[amvr]);

  }

  Mv getSymmvdMv(const Mv& curMvPred, const Mv& tarMvPred)

  {

    return Mv(tarMvPred.hor - hor + curMvPred.hor, tarMvPred.ver - ver + curMvPred.ver);

  }

  void clipToStorageBitDepth()

  {

    hor = Clip3( -( 1 << 17 ), ( 1 << 17 ) - 1, hor );

    ver = Clip3( -( 1 << 17 ), ( 1 << 17 ) - 1, ver );

  }

  void mvCliptoStorageBitDepth()  // periodic clipping

  {

    hor = (hor + mvClipPeriod) & (mvClipPeriod - 1);

    hor = (hor >= halMvClipPeriod) ? (hor - mvClipPeriod) : hor;

    ver = (ver + mvClipPeriod) & (mvClipPeriod - 1);

    ver = (ver >= halMvClipPeriod) ? (ver - mvClipPeriod) : ver;

  }

};// END CLASS DEFINITION MV

extern void(*clipMv) ( Mv& rcMv, const Position& pos, const struct Size& size, const SPS& sps, const PPS& pps );

void clipMvInPic     ( Mv& rcMv, const Position& pos, const struct Size& size, const SPS& sps, const PPS& pps );

void clipMvInSubpic  ( Mv& rcMv, const Position& pos, const struct Size& size, const SPS& sps, const PPS& pps );

bool wrapClipMv      ( Mv& rcMv, const Position& pos, const struct Size& size, const SPS& sps, const PPS& pps );

void roundAffineMv( int& mvx, int& mvy, int nShift );

}