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/** \file     Mv.cpp
    \brief    motion vector class
*/

#include "Mv.h"

#include "Common.h"
#include "Slice.h"

#if JVET_O0057_ALTHPELIF
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
#else
const MvPrecision Mv::m_amvrPrecision[3] = { MV_PRECISION_QUARTER, MV_PRECISION_INT, MV_PRECISION_4PEL }; // for cu.imv=0, 1 and 2
#endif
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 )
{
  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() )
  {
    return;
  }

  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 )
{
  bool wrapRef = true;
  int iMvShift = MV_FRACTIONAL_BITS_INTERNAL;
  int iOffset = 8;
  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 iVerMax = ( sps->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;
}

//! \}
