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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]  = { MvPrecision::QUARTER, MvPrecision::ONE, MvPrecision::FOUR,
                                              MvPrecision::HALF };   // for cu.imv=0, 1, 2 and 3
const MvPrecision Mv::m_amvrPrecAffine[3] = { MvPrecision::QUARTER, MvPrecision::SIXTEENTH,
                                              MvPrecision::ONE };   // for cu.imv=0, 1 and 2
const MvPrecision Mv::m_amvrPrecIbc[3]    = { MvPrecision::ONE, MvPrecision::ONE,
                                              MvPrecision::FOUR };   // for cu.imv=0, 1 and 2

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

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

  int mvShift = MV_FRACTIONAL_BITS_INTERNAL;
  const int offset  = PIC_MARGIN / 2;

  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);

  // Keep LSBs such as to not change filter phase
  const int mask = (1 << MV_FRACTIONAL_BITS_INTERNAL) - 1;
  rcMv.setHor(std::min(horMax, std::max(horMin, rcMv.getHor())) | (rcMv.getHor() & mask));
  rcMv.setVer(std::min(verMax, std::max(verMin, rcMv.getVer())) | (rcMv.getVer() & mask));
}

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

  int mvShift = MV_FRACTIONAL_BITS_INTERNAL;
  const int offset  = PIC_MARGIN / 2;

  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);
  }

  // Keep LSBs such as to not change filter phase
  const int mask = (1 << MV_FRACTIONAL_BITS_INTERNAL) - 1;
  rcMv.setHor(std::min(horMax, std::max(horMin, rcMv.getHor())) | (rcMv.getHor() & mask));
  rcMv.setVer(std::min(verMax, std::max(verMin, rcMv.getVer())) | (rcMv.getVer() & mask));
}

bool wrapClipMv( Mv& rcMv, const Position& pos, const struct Size& size, const SPS *sps, const PPS *pps )
{
  bool wrapRef = true;

  const int mvShift = MV_FRACTIONAL_BITS_INTERNAL;
  const int offset  = PIC_MARGIN / 2;

  int horMax = (pps->getPicWidthInLumaSamples() + sps->getMaxCUWidth() - size.width + 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() )
  {
    verMax = ((curSubPic.getSubPicBottom() + 1) + offset - (int) pos.y - 1) << mvShift;
    verMin = (-(int) sps->getMaxCUHeight() - offset - ((int) pos.y - curSubPic.getSubPicTop()) + 1) * (1 << mvShift);
  }
  int mvX = rcMv.getHor();

  if (mvX > horMax)
  {
    mvX -= pps->getWrapAroundOffset() << mvShift;
    wrapRef = false;
  }
  if (mvX < horMin)
  {
    mvX += pps->getWrapAroundOffset() << mvShift;
    wrapRef = false;
  }

  // Keep LSBs such as to not change filter phase
  const int mask = (1 << MV_FRACTIONAL_BITS_INTERNAL) - 1;
  rcMv.setHor(std::min(horMax, std::max(horMin, mvX)) | (mvX & mask));
  rcMv.setVer(std::min(verMax, std::max(verMin, rcMv.getVer())) | (rcMv.getVer() & mask));
  return wrapRef;
}

//! \}