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  /** \file     Mv.cpp
      \brief    motion vector class
  */
  
  #include "Mv.h"
  
  #include "Common.h"
  #include "Slice.h"
  
  const MvPrecision Mv::m_amvrPrecision[4] = { MV_PRECISION_QUARTER, MV_PRECISION_INT, MV_PRECISION_4PEL, MV_PRECISION_HALF }; // for cu.imv=0, 1, 2 and 3
  const MvPrecision Mv::m_amvrPrecAffine[3] = { MV_PRECISION_QUARTER, MV_PRECISION_SIXTEENTH, MV_PRECISION_INT }; // for cu.imv=0, 1 and 2
  const MvPrecision Mv::m_amvrPrecIbc[3] = { MV_PRECISION_INT, MV_PRECISION_INT, MV_PRECISION_4PEL }; // for cu.imv=0, 1 and 2
  
  void roundAffineMv( int& mvx, int& mvy, int nShift )
  {
    const int nOffset = 1 << (nShift - 1);
    mvx = (mvx + nOffset - (mvx >= 0)) >> nShift;
    mvy = (mvy + nOffset - (mvy >= 0)) >> nShift;
  }
  
  void clipMv( Mv& rcMv, const Position& pos, const struct Size& size, const SPS& sps, const PPS& pps )
  {
    if (sps.getWrapAroundEnabledFlag())
    {
      wrapClipMv(rcMv, pos, size, &sps, &pps);
      return;
    }
  
    int iMvShift = MV_FRACTIONAL_BITS_INTERNAL;
    int iOffset = 8;
    int iHorMax = ( pps.getPicWidthInLumaSamples() + iOffset - (int)pos.x - 1 ) << iMvShift;
    int iHorMin = ( -( int ) sps.getMaxCUWidth()   - iOffset - ( int ) pos.x + 1 ) << iMvShift;
  
    int iVerMax = ( pps.getPicHeightInLumaSamples() + iOffset - (int)pos.y - 1 ) << iMvShift;
    int iVerMin = ( -( int ) sps.getMaxCUHeight()   - iOffset - ( int ) pos.y + 1 ) << iMvShift;
  
    rcMv.setHor( std::min( iHorMax, std::max( iHorMin, rcMv.getHor() ) ) );
    rcMv.setVer( std::min( iVerMax, std::max( iVerMin, rcMv.getVer() ) ) );
  }
  
  bool wrapClipMv( Mv& rcMv, const Position& pos, const struct Size& size, const SPS *sps, const PPS *pps )
  {
    bool wrapRef = true;
    int iMvShift = MV_FRACTIONAL_BITS_INTERNAL;
    int iOffset = 8;
    int iHorMax = ( pps->getPicWidthInLumaSamples() + sps->getMaxCUWidth() - size.width + iOffset - (int)pos.x - 1 ) << iMvShift;
    int iHorMin = ( -( int ) sps->getMaxCUWidth()                                      - iOffset - ( int ) pos.x + 1 ) << iMvShift;
    int iVerMax = ( pps->getPicHeightInLumaSamples() + iOffset - (int)pos.y - 1 ) << iMvShift;
    int iVerMin = ( -( int ) sps->getMaxCUHeight()   - iOffset - ( int ) pos.y + 1 ) << iMvShift;
    int mvX = rcMv.getHor();
  
    if(mvX > iHorMax)
    {
      mvX -= ( sps->getWrapAroundOffset() << iMvShift );
      mvX = std::min( iHorMax, std::max( iHorMin, mvX ) );
      wrapRef = false;
    }
    if(mvX < iHorMin)
    {
      mvX += ( sps->getWrapAroundOffset() << iMvShift );
      mvX = std::min( iHorMax, std::max( iHorMin, mvX ) );
      wrapRef = false;
    }
  
    rcMv.setHor( mvX );
    rcMv.setVer( std::min( iVerMax, std::max( iVerMin, rcMv.getVer() ) ) );
    return wrapRef;
  }
  
  //! \}
  