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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[3] = { MV_PRECISION_QUARTER, MV_PRECISION_INT, MV_PRECISION_4PEL }; // for cu.imv=0, 1 and 2
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);
#if JVET_N0335_N0085_MV_ROUNDING
  mvx = (mvx + nOffset - (mvx >= 0)) >> nShift;
  mvy = (mvy + nOffset - (mvy >= 0)) >> nShift;
#else
  mvx = mvx >= 0 ? (mvx + nOffset) >> nShift : -((-mvx + nOffset) >> nShift);
  mvy = mvy >= 0 ? (mvy + nOffset) >> nShift : -((-mvy + nOffset) >> nShift);
#endif
}

void clipMv( Mv& rcMv, const Position& pos, const struct Size& size, const SPS& sps )
{
  int iMvShift = MV_FRACTIONAL_BITS_INTERNAL;
  int iOffset = 8;
  int iHorMax = ( sps.getPicWidthInLumaSamples() + iOffset - ( int ) pos.x - 1 ) << iMvShift;
  int iHorMin = ( -( int ) sps.getMaxCUWidth()   - iOffset - ( int ) pos.x + 1 ) << iMvShift;

  int iVerMax = ( sps.getPicHeightInLumaSamples() + iOffset - ( int ) pos.y - 1 ) << iMvShift;
  int iVerMin = ( -( int ) sps.getMaxCUHeight()   - iOffset - ( int ) pos.y + 1 ) << iMvShift;

  if( sps.getWrapAroundEnabledFlag() )
  {
    int iHorMax = ( sps.getPicWidthInLumaSamples() + sps.getMaxCUWidth() - size.width + iOffset - ( int ) pos.x - 1 ) << iMvShift;
    int iHorMin = ( -( int ) sps.getMaxCUWidth()                                      - iOffset - ( int ) pos.x + 1 ) << iMvShift;
    int mvX = rcMv.getHor();
    while( mvX > iHorMax ) {
      mvX -= ( sps.getWrapAroundOffset() << iMvShift );
    }
    while( mvX < iHorMin ) {
      mvX += ( sps.getWrapAroundOffset() << iMvShift );
    }
    rcMv.setHor( mvX );
    rcMv.setVer( std::min( iVerMax, std::max( iVerMin, rcMv.getVer() ) ) );
    return;
  }

  rcMv.setHor( std::min( iHorMax, std::max( iHorMin, rcMv.getHor() ) ) );
  rcMv.setVer( std::min( iVerMax, std::max( iVerMin, rcMv.getVer() ) ) );
}

//! \}