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

#include "Mv.h"

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

namespace vvdec
{

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

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 clipMvInPic ( Mv& rcMv, const Position& pos, const struct Size& size, const SPS& sps, const PPS& pps )
{
  if( sps.getUseWrapAround() )
  {
    wrapClipMv( rcMv, pos, size, sps, pps );
    return;
  }

  int mvShift = MV_FRACTIONAL_BITS_INTERNAL;
  int offset = 8;
  int horMax = (pps.getPicWidthInLumaSamples() + offset - (int)pos.x - 1) *(1 << mvShift);
  int horMin = (-(int)sps.getMaxCUWidth() - offset - (int)pos.x + 1) *(1 << mvShift);

  int verMax = (pps.getPicHeightInLumaSamples() + offset - (int)pos.y - 1) *(1 << mvShift);
  int verMin = (-(int)sps.getMaxCUHeight() - offset - (int)pos.y + 1) *(1 << mvShift);

  rcMv.setHor(std::min(horMax, std::max(horMin, rcMv.getHor())));
  rcMv.setVer(std::min(verMax, std::max(verMin, rcMv.getVer())));
}

void clipMvInSubpic ( Mv& rcMv, const struct Position& pos, const struct Size& size, const SPS& sps, const PPS& pps )
{
  if( sps.getUseWrapAround() )
  {
    wrapClipMv( rcMv, pos, size, sps, pps );
    return;
  }

  int mvShift = MV_FRACTIONAL_BITS_INTERNAL;
  int offset = 8;
  int horMax = (pps.getPicWidthInLumaSamples() + offset - (int)pos.x - 1) << mvShift;
  int horMin = (-(int)sps.getMaxCUWidth() - offset - (int)pos.x + 1) *(1<< mvShift);

  int verMax = (pps.getPicHeightInLumaSamples() + offset - (int)pos.y - 1) << mvShift;
  int verMin = (-(int)sps.getMaxCUHeight() - offset - (int)pos.y + 1) *(1<< mvShift);
  const SubPic& curSubPic = pps.getSubPicFromPos(pos);
  if (curSubPic.getTreatedAsPicFlag())
  {
    horMax = ((curSubPic.getSubPicRight() + 1) + offset - (int)pos.x - 1) << mvShift;
    horMin = (-(int)sps.getMaxCUWidth() - offset - ((int)pos.x - curSubPic.getSubPicLeft()) + 1) *(1<< mvShift);

    verMax = ((curSubPic.getSubPicBottom() + 1) + offset - (int)pos.y - 1) << mvShift;
    verMin = (-(int)sps.getMaxCUHeight() - offset - ((int)pos.y - curSubPic.getSubPicTop()) + 1) *(1<< mvShift);
  }
  rcMv.setHor(std::min(horMax, std::max(horMin, rcMv.getHor())));
  rcMv.setVer(std::min(verMax, std::max(verMin, 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 ) *(1<< iMvShift);
  int iVerMax = ( pps.getPicHeightInLumaSamples() + iOffset - (int)pos.y - 1 ) << iMvShift;
  int iVerMin = ( -( int ) sps.getMaxCUHeight()   - iOffset - ( int ) pos.y + 1 ) *(1<< iMvShift);
  int mvX = rcMv.getHor();

  if(mvX > iHorMax)
  {
    mvX -= ( pps.getWrapAroundOffset() << iMvShift );
    mvX = std::min( iHorMax, std::max( iHorMin, mvX ) );
    wrapRef = false;
  }
  if(mvX < iHorMin)
  {
    mvX += ( pps.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;
}


}
