UnitTools.cpp

      {
        posC0 = posRB.offset( 4, 4 );
        // same as for last column but not last row
      }
    }

    // C0
    Mv        cColMv;
    int32_t   refIdx     = 0;
    bool      existMV    = ( isAvailableC0 && getColocatedMVP( pu, REF_PIC_LIST_0, posC0, cColMv, refIdx ) );
    MotionInfo temporalMv;
    temporalMv.interDir  = 0;
    if( existMV )
    {
      temporalMv.isInter   = true;
      temporalMv.interDir |= 1;
      temporalMv.mv[0]     = cColMv;
      temporalMv.refIdx[0] = refIdx;
    }
    existMV = ( isAvailableC0 && getColocatedMVP( pu, REF_PIC_LIST_1, posC0, cColMv, refIdx ) );
    if( existMV )
    {
      temporalMv.interDir |= 2;
      temporalMv.mv[1]     = cColMv;
      temporalMv.refIdx[1] = refIdx;
    }

    if( temporalMv.interDir != 0 )
    {
      candidate[candCount].isInter   = true;
      candidate[candCount].interDir  = temporalMv.interDir;
      candidate[candCount].mv[0]     = temporalMv.mv[0];
      candidate[candCount].mv[1]     = temporalMv.mv[1];
      candidate[candCount].refIdx[0] = temporalMv.refIdx[0];
      candidate[candCount].refIdx[1] = temporalMv.refIdx[1];
      candCount++;
    }
   
    // C1
    temporalMv.interDir = 0;
#if JVET_M0170_MRG_SHARELIST
    existMV    = isAvailableC1 && getColocatedMVP(pu, REF_PIC_LIST_0, posC1, cColMv, refIdx );
#else
    existMV    = getColocatedMVP(pu, REF_PIC_LIST_0, posC1, cColMv, refIdx );
#endif
    if( existMV )
    {
      temporalMv.isInter   = true;
      temporalMv.interDir |= 1;
      temporalMv.mv[0]     = cColMv;
      temporalMv.refIdx[0] = refIdx;
    }
#if JVET_M0170_MRG_SHARELIST
    existMV    = isAvailableC1 && getColocatedMVP(pu, REF_PIC_LIST_1, posC1, cColMv, refIdx );
#else
    existMV    = getColocatedMVP(pu, REF_PIC_LIST_1, posC1, cColMv, refIdx );
#endif
    if( existMV )
    {
      temporalMv.interDir |= 2;
      temporalMv.mv[1]     = cColMv;
      temporalMv.refIdx[1] = refIdx;
    }

    if( temporalMv.interDir != 0 )
    {
      candidate[candCount].isInter   = true;
      candidate[candCount].interDir  = temporalMv.interDir;
      candidate[candCount].mv[0]     = temporalMv.mv[0];
      candidate[candCount].mv[1]     = temporalMv.mv[1];
      candidate[candCount].refIdx[0] = temporalMv.refIdx[0];
      candidate[candCount].refIdx[1] = temporalMv.refIdx[1];
      candCount++;
    }
  }
  // put uni-prediction candidate to the triangle candidate list
  for( int32_t i = 0; i < candCount; i++ )
  { 
    if( candidate[i].interDir != 3 )
    {
      triangleMrgCtx.interDirNeighbours[triangleMrgCtx.numValidMergeCand] = candidate[i].interDir;
      triangleMrgCtx.mrgTypeNeighbours [triangleMrgCtx.numValidMergeCand] = MRG_TYPE_DEFAULT_N;
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1)    ].mv = candidate[i].mv[0];
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1].mv = candidate[i].mv[1];
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1)    ].refIdx = candidate[i].refIdx[0];
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1].refIdx = candidate[i].refIdx[1];
      triangleMrgCtx.numValidMergeCand += isUniqueTriangleCandidates(pu, triangleMrgCtx);
      if( triangleMrgCtx.numValidMergeCand == TRIANGLE_MAX_NUM_UNI_CANDS )
      {
        return;
      }
    }
  }

  // put L0 mv of bi-prediction candidate to the triangle candidate list
  for( int32_t i = 0; i < candCount; i++ )
  {
    if( candidate[i].interDir == 3 )
    {
      triangleMrgCtx.interDirNeighbours[triangleMrgCtx.numValidMergeCand] = 1;
      triangleMrgCtx.mrgTypeNeighbours [triangleMrgCtx.numValidMergeCand] = MRG_TYPE_DEFAULT_N;
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1)    ].mv = candidate[i].mv[0];
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1].mv = Mv(0, 0);
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1)    ].refIdx = candidate[i].refIdx[0];
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1].refIdx = -1;
      triangleMrgCtx.numValidMergeCand += isUniqueTriangleCandidates(pu, triangleMrgCtx);
      if( triangleMrgCtx.numValidMergeCand == TRIANGLE_MAX_NUM_UNI_CANDS )
      {
        return;
      }
    }
  }

  // put L1 mv of bi-prediction candidate to the triangle candidate list
  for( int32_t i = 0; i < candCount; i++ )
  {
    if( candidate[i].interDir == 3 )
    {
      triangleMrgCtx.interDirNeighbours[triangleMrgCtx.numValidMergeCand] = 2;
      triangleMrgCtx.mrgTypeNeighbours [triangleMrgCtx.numValidMergeCand] = MRG_TYPE_DEFAULT_N;
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1)    ].mv = Mv(0, 0);
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1].mv = candidate[i].mv[1];
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1)    ].refIdx = -1;
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1].refIdx = candidate[i].refIdx[1];
      triangleMrgCtx.numValidMergeCand += isUniqueTriangleCandidates(pu, triangleMrgCtx);
      if( triangleMrgCtx.numValidMergeCand == TRIANGLE_MAX_NUM_UNI_CANDS )
      {
        return;
      }
    }
  }

  // put average of L0 and L1 mvs of bi-prediction candidate to the triangle candidate list
  for( int32_t i = 0; i < candCount; i++ )
  {
    if( candidate[i].interDir == 3 )
    {
      int32_t curPicPoc   = slice.getPOC();
      int32_t refPicPocL0 = slice.getRefPOC(REF_PIC_LIST_0, candidate[i].refIdx[0]);
      int32_t refPicPocL1 = slice.getRefPOC(REF_PIC_LIST_1, candidate[i].refIdx[1]);
      Mv aveMv = candidate[i].mv[1];
      int32_t distscale = xGetDistScaleFactor( curPicPoc, refPicPocL0, curPicPoc, refPicPocL1 );
      if( distscale != 4096 )
      {
        aveMv = aveMv.scaleMv( distscale ); // scaling to L0
      }
#if JVET_M0265_MV_ROUNDING_CLEANUP
      aveMv = aveMv + candidate[i].mv[0];
      roundAffineMv(aveMv.hor, aveMv.ver, 1);
#else
      aveMv.setHor( ( aveMv.getHor() + candidate[i].mv[0].getHor() + 1 ) >> 1 );
      aveMv.setVer( ( aveMv.getVer() + candidate[i].mv[0].getVer() + 1 ) >> 1 );
#endif    
      triangleMrgCtx.interDirNeighbours[triangleMrgCtx.numValidMergeCand] = 1;
      triangleMrgCtx.mrgTypeNeighbours [triangleMrgCtx.numValidMergeCand] = MRG_TYPE_DEFAULT_N;
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1)    ].mv = aveMv;
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1].mv = Mv(0, 0);
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1)    ].refIdx = candidate[i].refIdx[0];
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1].refIdx = -1;
      triangleMrgCtx.numValidMergeCand += isUniqueTriangleCandidates(pu, triangleMrgCtx);
      if( triangleMrgCtx.numValidMergeCand == TRIANGLE_MAX_NUM_UNI_CANDS )
      {
        return;
      }
    }
  } 
    
  // fill with Mv(0, 0)
  int32_t numRefIdx = std::min( slice.getNumRefIdx(REF_PIC_LIST_0), slice.getNumRefIdx(REF_PIC_LIST_1) );
  int32_t cnt = 0;
  while( triangleMrgCtx.numValidMergeCand < TRIANGLE_MAX_NUM_UNI_CANDS )
  {
    if( cnt < numRefIdx )
    {
      triangleMrgCtx.interDirNeighbours[triangleMrgCtx.numValidMergeCand] = 1;
      triangleMrgCtx.mvFieldNeighbours[triangleMrgCtx.numValidMergeCand << 1].setMvField(Mv(0, 0), cnt);
      triangleMrgCtx.numValidMergeCand++;
      
      if( triangleMrgCtx.numValidMergeCand == TRIANGLE_MAX_NUM_UNI_CANDS )
      {
        return;
      }
      
      triangleMrgCtx.interDirNeighbours[triangleMrgCtx.numValidMergeCand] = 2;
      triangleMrgCtx.mvFieldNeighbours [(triangleMrgCtx.numValidMergeCand << 1) + 1 ].setMvField(Mv(0, 0), cnt);
      triangleMrgCtx.numValidMergeCand++;
      
      cnt = (cnt + 1) % numRefIdx;
    }
  }  
}

bool PU::isUniqueTriangleCandidates( const PredictionUnit &pu, MergeCtx& triangleMrgCtx )
{
  int newCand = triangleMrgCtx.numValidMergeCand;
  for( int32_t i = 0; i < newCand; i++ )
  {
    int32_t predFlagCur  = triangleMrgCtx.interDirNeighbours[i] == 1 ? 0 : 1;
    int32_t predFlagNew  = triangleMrgCtx.interDirNeighbours[newCand] == 1 ? 0 : 1;
    int32_t refPicPocCur = pu.cs->slice->getRefPOC( (RefPicList)predFlagCur, triangleMrgCtx.mvFieldNeighbours[(i << 1) + predFlagCur].refIdx );
    int32_t refPicPocNew = pu.cs->slice->getRefPOC( (RefPicList)predFlagNew, triangleMrgCtx.mvFieldNeighbours[(newCand << 1) + predFlagNew].refIdx);
    if( refPicPocCur == refPicPocNew && triangleMrgCtx.mvFieldNeighbours[(i << 1) + predFlagCur].mv == triangleMrgCtx.mvFieldNeighbours[(newCand << 1) + predFlagNew].mv )
    {
      return false;
    }
  }
  return true;  
}

#if !JVET_M0328_KEEP_ONE_WEIGHT_GROUP
bool PU::getTriangleWeights( const PredictionUnit& pu, MergeCtx &triangleMrgCtx, const uint8_t candIdx0, const uint8_t candIdx1 )
{
  RefPicList refPicListCand0 = triangleMrgCtx.interDirNeighbours[candIdx0] == 1 ? REF_PIC_LIST_0 : REF_PIC_LIST_1;
  RefPicList refPicListCand1 = triangleMrgCtx.interDirNeighbours[candIdx1] == 1 ? REF_PIC_LIST_0 : REF_PIC_LIST_1;
  int32_t refPicPoc0 = pu.cs->slice->getRefPOC( refPicListCand0, triangleMrgCtx.mvFieldNeighbours[ (candIdx0 << 1) + refPicListCand0 ].refIdx );
  int32_t refPicPoc1 = pu.cs->slice->getRefPOC( refPicListCand1, triangleMrgCtx.mvFieldNeighbours[ (candIdx1 << 1) + refPicListCand1 ].refIdx );
  
  if( refPicPoc0 != refPicPoc1 )
  {
    // different reference picture
    return true;
  }
  
  // same reference picture, but mv difference is larger than 16 pel
  int32_t threshold = 16 << 4;
  Mv diffMv = triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + refPicListCand0].mv - triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + refPicListCand1].mv;
  
  if( diffMv.getAbsHor() > threshold || diffMv.getAbsVer() > threshold  )
  {
    return true;
  }

  return false;
}
#endif

#if JVET_M0883_TRIANGLE_SIGNALING
void PU::spanTriangleMotionInfo( PredictionUnit &pu, MergeCtx &triangleMrgCtx, const bool splitDir, const uint8_t candIdx0, const uint8_t candIdx1 )
#else
void PU::spanTriangleMotionInfo( PredictionUnit &pu, MergeCtx &triangleMrgCtx, const uint8_t mergeIdx, const bool splitDir, const uint8_t candIdx0, const uint8_t candIdx1 )
#endif
{
#if JVET_M0883_TRIANGLE_SIGNALING
  pu.triangleSplitDir = splitDir;
  pu.triangleMergeIdx0 = candIdx0;
  pu.triangleMergeIdx1 = candIdx1;
#else
  pu.mergeIdx  = mergeIdx;
#endif
  MotionBuf mb = pu.getMotionBuf();

  MotionInfo biMv;
  biMv.isInter  = true;
  
  if( triangleMrgCtx.interDirNeighbours[candIdx0] == 1 && triangleMrgCtx.interDirNeighbours[candIdx1] == 2 )
  {
    biMv.interDir  = 3;
    biMv.mv[0]     = triangleMrgCtx.mvFieldNeighbours[ candIdx0 << 1     ].mv;
    biMv.mv[1]     = triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].mv;
    biMv.refIdx[0] = triangleMrgCtx.mvFieldNeighbours[ candIdx0 << 1     ].refIdx;
    biMv.refIdx[1] = triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].refIdx;
  }
  else if( triangleMrgCtx.interDirNeighbours[candIdx0] == 2 && triangleMrgCtx.interDirNeighbours[candIdx1] == 1 )
  {
    biMv.interDir  = 3;
    biMv.mv[0]     = triangleMrgCtx.mvFieldNeighbours[ candIdx1 << 1     ].mv;
    biMv.mv[1]     = triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].mv;
    biMv.refIdx[0] = triangleMrgCtx.mvFieldNeighbours[ candIdx1 << 1     ].refIdx;
    biMv.refIdx[1] = triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].refIdx;
  }
  else if( triangleMrgCtx.interDirNeighbours[candIdx0] == 1 && triangleMrgCtx.interDirNeighbours[candIdx1] == 1 )
  {
    int32_t refIdx = mappingRefPic( pu, pu.cs->slice->getRefPOC( REF_PIC_LIST_0, triangleMrgCtx.mvFieldNeighbours[candIdx1 << 1].refIdx ), REF_PIC_LIST_1 );
    if( refIdx != -1 )
    {
      biMv.interDir  = 3;
      biMv.mv[0]     = triangleMrgCtx.mvFieldNeighbours[candIdx0 << 1].mv;
      biMv.mv[1]     = triangleMrgCtx.mvFieldNeighbours[candIdx1 << 1].mv;
      biMv.refIdx[0] = triangleMrgCtx.mvFieldNeighbours[candIdx0 << 1].refIdx;
      biMv.refIdx[1] = refIdx;
    }
    else
    {
      refIdx = mappingRefPic( pu, pu.cs->slice->getRefPOC( REF_PIC_LIST_0, triangleMrgCtx.mvFieldNeighbours[candIdx0 << 1].refIdx), REF_PIC_LIST_1 );
      biMv.interDir  = ( refIdx != -1 ) ? 3 : 1;
      biMv.mv[0]     = ( refIdx != -1 ) ? triangleMrgCtx.mvFieldNeighbours[candIdx1 << 1].mv : triangleMrgCtx.mvFieldNeighbours[candIdx0 << 1].mv;
      biMv.mv[1]     = ( refIdx != -1 ) ? triangleMrgCtx.mvFieldNeighbours[candIdx0 << 1].mv : Mv(0, 0);
      biMv.refIdx[0] = ( refIdx != -1 ) ? triangleMrgCtx.mvFieldNeighbours[candIdx1 << 1].refIdx : triangleMrgCtx.mvFieldNeighbours[candIdx0 << 1].refIdx;
      biMv.refIdx[1] = ( refIdx != -1 ) ? refIdx : -1;
    }
  }
  else if( triangleMrgCtx.interDirNeighbours[candIdx0] == 2 && triangleMrgCtx.interDirNeighbours[candIdx1] == 2 )
  {
    int32_t refIdx = mappingRefPic( pu, pu.cs->slice->getRefPOC( REF_PIC_LIST_1, triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].refIdx ), REF_PIC_LIST_0 );
    if( refIdx != -1 )
    {
      biMv.interDir  = 3;
      biMv.mv[0]     = triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].mv;
      biMv.mv[1]     = triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].mv;
      biMv.refIdx[0] = refIdx;
      biMv.refIdx[1] = triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].refIdx;
    }
    else
    {
      refIdx = mappingRefPic( pu, pu.cs->slice->getRefPOC( REF_PIC_LIST_1, triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].refIdx ), REF_PIC_LIST_0 );
      biMv.interDir  = ( refIdx != -1 ) ? 3 : 2;
      biMv.mv[0]     = ( refIdx != -1 ) ? triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].mv : Mv(0, 0);
      biMv.mv[1]     = ( refIdx != -1 ) ? triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].mv : triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].mv;
      biMv.refIdx[0] = ( refIdx != -1 ) ? refIdx : -1; 
      biMv.refIdx[1] = ( refIdx != -1 ) ? triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].refIdx : triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].refIdx;
    }
  }

  int32_t idxW  = (int32_t)(g_aucLog2[pu.lwidth() ] - MIN_CU_LOG2);
  int32_t idxH  = (int32_t)(g_aucLog2[pu.lheight()] - MIN_CU_LOG2);
  for( int32_t y = 0; y < mb.height; y++ )
  {
    for( int32_t x = 0; x < mb.width; x++ )
    {
      if( g_triangleMvStorage[splitDir][idxH][idxW][y][x] == 2 )
      {
        mb.at( x, y ).isInter   = true;
        mb.at( x, y ).interDir  = biMv.interDir;
        mb.at( x, y ).refIdx[0] = biMv.refIdx[0];
        mb.at( x, y ).refIdx[1] = biMv.refIdx[1];
        mb.at( x, y ).mv    [0] = biMv.mv    [0];
        mb.at( x, y ).mv    [1] = biMv.mv    [1];
      }
      else if( g_triangleMvStorage[splitDir][idxH][idxW][y][x] == 0 )
      {
        mb.at( x, y ).isInter   = true;
        mb.at( x, y ).interDir  = triangleMrgCtx.interDirNeighbours[candIdx0];
        mb.at( x, y ).refIdx[0] = triangleMrgCtx.mvFieldNeighbours[ candIdx0 << 1     ].refIdx;
        mb.at( x, y ).refIdx[1] = triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].refIdx;
        mb.at( x, y ).mv    [0] = triangleMrgCtx.mvFieldNeighbours[ candIdx0 << 1     ].mv;
        mb.at( x, y ).mv    [1] = triangleMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].mv;
      }
      else
      {
        mb.at( x, y ).isInter   = true;
        mb.at( x, y ).interDir  = triangleMrgCtx.interDirNeighbours[candIdx1];
        mb.at( x, y ).refIdx[0] = triangleMrgCtx.mvFieldNeighbours[ candIdx1 << 1     ].refIdx;
        mb.at( x, y ).refIdx[1] = triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].refIdx;
        mb.at( x, y ).mv    [0] = triangleMrgCtx.mvFieldNeighbours[ candIdx1 << 1     ].mv;
        mb.at( x, y ).mv    [1] = triangleMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].mv;
      }
    }
  }
}

int32_t PU::mappingRefPic( const PredictionUnit &pu, int32_t refPicPoc, bool targetRefPicList )
{
  int32_t numRefIdx = pu.cs->slice->getNumRefIdx( (RefPicList)targetRefPicList );

  for( int32_t i = 0; i < numRefIdx; i++ )
  {
    if( pu.cs->slice->getRefPOC( (RefPicList)targetRefPicList, i ) == refPicPoc )
    {
      return i;
    }
  }
  return -1;
}

void CU::resetMVDandMV2Int( CodingUnit& cu, InterPrediction *interPred )
{
  for( auto &pu : CU::traversePUs( cu ) )
  {
    MergeCtx mrgCtx;

    if( !pu.mergeFlag )
    {
      if( pu.interDir != 2 /* PRED_L1 */ )
      {
        Mv mv        = pu.mv[0];
        Mv mvPred;
        AMVPInfo amvpInfo;
        PU::fillMvpCand(pu, REF_PIC_LIST_0, pu.refIdx[0], amvpInfo);
        pu.mvpNum[0] = amvpInfo.numCand;

        mvPred       = amvpInfo.mvCand[pu.mvpIdx[0]];
        mv.roundToAmvrSignalPrecision(MV_PRECISION_QUARTER, cu.imv);
        pu.mv[0]     = mv;
        Mv mvDiff    = mv - mvPred;
        pu.mvd[0]    = mvDiff;
      }
      if( pu.interDir != 1 /* PRED_L0 */ )
      {
        Mv mv        = pu.mv[1];
        Mv mvPred;
        AMVPInfo amvpInfo;
        PU::fillMvpCand(pu, REF_PIC_LIST_1, pu.refIdx[1], amvpInfo);
        pu.mvpNum[1] = amvpInfo.numCand;

        mvPred       = amvpInfo.mvCand[pu.mvpIdx[1]];
        mv.roundToAmvrSignalPrecision(MV_PRECISION_QUARTER, cu.imv);
        Mv mvDiff    = mv - mvPred;

        if( pu.cu->cs->slice->getMvdL1ZeroFlag() && pu.interDir == 3 /* PRED_BI */ )
        {
          pu.mvd[1] = Mv();
          mv = mvPred;
        }
        else
        {
          pu.mvd[1] = mvDiff;
        }
        pu.mv[1] = mv;
      }

    }
    else
    {
        PU::getInterMergeCandidates ( pu, mrgCtx 
          , 0
        );
#if !JVET_M0068_M0171_MMVD_CLEANUP
        PU::restrictBiPredMergeCands( pu, mrgCtx );
#endif

        mrgCtx.setMergeInfo( pu, pu.mergeIdx );
    }

    PU::spanMotionInfo( pu, mrgCtx );
  }
}

bool CU::hasSubCUNonZeroMVd( const CodingUnit& cu )
{
  bool bNonZeroMvd = false;

  for( const auto &pu : CU::traversePUs( cu ) )
  {
    if( ( !pu.mergeFlag ) && ( !cu.skip ) )
    {
      if( pu.interDir != 2 /* PRED_L1 */ )
      {
        bNonZeroMvd |= pu.mvd[REF_PIC_LIST_0].getHor() != 0;
        bNonZeroMvd |= pu.mvd[REF_PIC_LIST_0].getVer() != 0;
      }
      if( pu.interDir != 1 /* PRED_L0 */ )
      {
        if( !pu.cu->cs->slice->getMvdL1ZeroFlag() || pu.interDir != 3 /* PRED_BI */ )
        {
          bNonZeroMvd |= pu.mvd[REF_PIC_LIST_1].getHor() != 0;
          bNonZeroMvd |= pu.mvd[REF_PIC_LIST_1].getVer() != 0;
        }
      }
    }
  }

  return bNonZeroMvd;
}

#if JVET_M0246_AFFINE_AMVR
bool CU::hasSubCUNonZeroAffineMVd( const CodingUnit& cu )
{
  bool nonZeroAffineMvd = false;

  if ( !cu.affine || cu.firstPU->mergeFlag )
  {
    return false;
  }

  for ( const auto &pu : CU::traversePUs( cu ) )
  {
    if ( ( !pu.mergeFlag ) && ( !cu.skip ) )
    {
      if ( pu.interDir != 2 /* PRED_L1 */ )
      {
        for ( int i = 0; i < ( cu.affineType == AFFINEMODEL_6PARAM ? 3 : 2 ); i++ )
        {
          nonZeroAffineMvd |= pu.mvdAffi[REF_PIC_LIST_0][i].getHor() != 0;
          nonZeroAffineMvd |= pu.mvdAffi[REF_PIC_LIST_0][i].getVer() != 0;
        }
      }

      if ( pu.interDir != 1 /* PRED_L0 */ )
      {
        if ( !pu.cu->cs->slice->getMvdL1ZeroFlag() || pu.interDir != 3 /* PRED_BI */ )
        {
          for ( int i = 0; i < ( cu.affineType == AFFINEMODEL_6PARAM ? 3 : 2 ); i++ )
          {
            nonZeroAffineMvd |= pu.mvdAffi[REF_PIC_LIST_1][i].getHor() != 0;
            nonZeroAffineMvd |= pu.mvdAffi[REF_PIC_LIST_1][i].getVer() != 0;
          }
        }
      }
    }
  }

  return nonZeroAffineMvd;
}
#endif

int CU::getMaxNeighboriMVCandNum( const CodingStructure& cs, const Position& pos )
{
  const int  numDefault     = 0;
  int        maxImvNumCand  = 0;

  // Get BCBP of left PU
#if HEVC_TILES_WPP
  const CodingUnit *cuLeft  = cs.getCURestricted( pos.offset( -1, 0 ), cs.slice->getIndependentSliceIdx(), cs.picture->tileMap->getTileIdxMap( pos ), CH_L );
#else
  const CodingUnit *cuLeft  = cs.getCURestricted( pos.offset( -1, 0 ), cs.slice->getIndependentSliceIdx(), CH_L );
#endif
  maxImvNumCand = ( cuLeft ) ? cuLeft->imvNumCand : numDefault;

  // Get BCBP of above PU
#if HEVC_TILES_WPP
  const CodingUnit *cuAbove = cs.getCURestricted( pos.offset( 0, -1 ), cs.slice->getIndependentSliceIdx(), cs.picture->tileMap->getTileIdxMap( pos ), CH_L );
#else
  const CodingUnit *cuAbove = cs.getCURestricted( pos.offset( 0, -1 ), cs.slice->getIndependentSliceIdx(), CH_L );
#endif
  maxImvNumCand = std::max( maxImvNumCand, ( cuAbove ) ? cuAbove->imvNumCand : numDefault );

  return maxImvNumCand;
}

bool CU::isGBiIdxCoded( const CodingUnit &cu )
{
  if( cu.cs->sps->getSpsNext().getUseGBi() == false )
  {
    CHECK(cu.GBiIdx != GBI_DEFAULT, "Error: cu.GBiIdx != GBI_DEFAULT");
    return false;
  }

  if( cu.predMode == MODE_INTRA || cu.cs->slice->isInterP() )
  {
    return false;
  }

  if( cu.lwidth() * cu.lheight() < GBI_SIZE_CONSTRAINT )
  {
    return false;
  }

  if( cu.firstPU->interDir == 3 && !cu.firstPU->mergeFlag )
  {
    return true;
  }

  return false;
}

uint8_t CU::getValidGbiIdx( const CodingUnit &cu )
{
  if( cu.firstPU->interDir == 3 && !cu.firstPU->mergeFlag )
  {
    return cu.GBiIdx;
  }
  else if( cu.firstPU->interDir == 3 && cu.firstPU->mergeFlag && cu.firstPU->mergeType == MRG_TYPE_DEFAULT_N )
  {
    // This is intended to do nothing here.
  }
  else if( cu.firstPU->mergeFlag && cu.firstPU->mergeType == MRG_TYPE_SUBPU_ATMVP )
  {
    CHECK(cu.GBiIdx != GBI_DEFAULT, " cu.GBiIdx != GBI_DEFAULT ");
  }
  else
  {
    CHECK(cu.GBiIdx != GBI_DEFAULT, " cu.GBiIdx != GBI_DEFAULT ");
  }

  return GBI_DEFAULT;
}

void CU::setGbiIdx( CodingUnit &cu, uint8_t uh )
{
  int8_t uhCnt = 0;

  if( cu.firstPU->interDir == 3 && !cu.firstPU->mergeFlag )
  {
    cu.GBiIdx = uh;
    ++uhCnt;
  }
  else if( cu.firstPU->interDir == 3 && cu.firstPU->mergeFlag && cu.firstPU->mergeType == MRG_TYPE_DEFAULT_N )
  {
    // This is intended to do nothing here.
  }
  else if( cu.firstPU->mergeFlag && cu.firstPU->mergeType == MRG_TYPE_SUBPU_ATMVP )
  {
    cu.GBiIdx = GBI_DEFAULT;
  }
  else
  {
    cu.GBiIdx = GBI_DEFAULT;
  }

  CHECK(uhCnt <= 0, " uhCnt <= 0 ");
}

uint8_t CU::deriveGbiIdx( uint8_t gbiLO, uint8_t gbiL1 )
{
  if( gbiLO == gbiL1 )
  {
    return gbiLO;
  }
  const int8_t w0 = getGbiWeight(gbiLO, REF_PIC_LIST_0);
  const int8_t w1 = getGbiWeight(gbiL1, REF_PIC_LIST_1);
  const int8_t th = g_GbiWeightBase >> 1;
  const int8_t off = 1;

  if( w0 == w1 || (w0 < (th - off) && w1 < (th - off)) || (w0 >(th + off) && w1 >(th + off)) )
  {
    return GBI_DEFAULT;
  }
  else
  {
    if( w0 > w1 )
    {
      return ( w0 >= th ? gbiLO : gbiL1 );
    }
    else
    {
      return ( w1 >= th ? gbiL1 : gbiLO );
    }
  }
}

// TU tools

#if HEVC_USE_4x4_DSTVII
bool TU::useDST(const TransformUnit &tu, const ComponentID &compID)
{
  return isLuma(compID) && tu.cu->predMode == MODE_INTRA;
}

#endif

bool TU::isNonTransformedResidualRotated(const TransformUnit &tu, const ComponentID &compID)
{
  return tu.cs->sps->getSpsRangeExtension().getTransformSkipRotationEnabledFlag() && tu.blocks[compID].width == 4 && tu.cu->predMode == MODE_INTRA;
}

bool TU::getCbf( const TransformUnit &tu, const ComponentID &compID )
{
  return getCbfAtDepth( tu, compID, tu.depth );
}

bool TU::getCbfAtDepth(const TransformUnit &tu, const ComponentID &compID, const unsigned &depth)
{
  return ((tu.cbf[compID] >> depth) & 1) == 1;
}

void TU::setCbfAtDepth(TransformUnit &tu, const ComponentID &compID, const unsigned &depth, const bool &cbf)
{
  // first clear the CBF at the depth
  tu.cbf[compID] &= ~(1  << depth);
  // then set the CBF
  tu.cbf[compID] |= ((cbf ? 1 : 0) << depth);
}

#if JVET_M0464_UNI_MTS
bool TU::isTSAllowed(const TransformUnit &tu, const ComponentID compID)
{
  bool    tsAllowed = compID == COMPONENT_Y;
  const int maxSize = tu.cs->pps->getPpsRangeExtension().getLog2MaxTransformSkipBlockSize();

  tsAllowed &= tu.cs->pps->getUseTransformSkip();
  tsAllowed &= !tu.cu->transQuantBypass;

  SizeType transformSkipMaxSize = 1 << maxSize;
  tsAllowed &= tu.lwidth() <= transformSkipMaxSize && tu.lheight() <= transformSkipMaxSize;

  return tsAllowed;
}

bool TU::isMTSAllowed(const TransformUnit &tu, const ComponentID compID)
{
  bool   mtsAllowed = compID == COMPONENT_Y;
  const int maxSize = CU::isIntra( *tu.cu ) ? MTS_INTRA_MAX_CU_SIZE : MTS_INTER_MAX_CU_SIZE;

  mtsAllowed &= CU::isIntra( *tu.cu ) ? tu.cs->sps->getSpsNext().getUseIntraMTS() : tu.cs->sps->getSpsNext().getUseInterMTS();
  mtsAllowed &= ( tu.lwidth() <= maxSize && tu.lheight() <= maxSize );
  return mtsAllowed;
}
#else
bool TU::hasTransformSkipFlag(const CodingStructure& cs, const CompArea& area)
{
  uint32_t transformSkipLog2MaxSize = cs.pps->getPpsRangeExtension().getLog2MaxTransformSkipBlockSize();

  SizeType transformSkipMaxSize = 1 << transformSkipLog2MaxSize;
  return area.width <= transformSkipMaxSize && area.height <= transformSkipMaxSize;
}
#endif

uint32_t TU::getGolombRiceStatisticsIndex(const TransformUnit &tu, const ComponentID &compID)
{
#if JVET_M0464_UNI_MTS
  const bool transformSkip    = tu.mtsIdx==1;
#else
  const bool transformSkip    = tu.transformSkip[compID];
#endif
  const bool transquantBypass = tu.cu->transQuantBypass;

  //--------

  const uint32_t channelTypeOffset = isChroma(compID) ? 2 : 0;
  const uint32_t nonTransformedOffset = (transformSkip || transquantBypass) ? 1 : 0;

  //--------

  const uint32_t selectedIndex = channelTypeOffset + nonTransformedOffset;
  CHECK( selectedIndex >= RExt__GOLOMB_RICE_ADAPTATION_STATISTICS_SETS, "Invalid golomb rice adaptation statistics set" );

  return selectedIndex;
}

#if HEVC_USE_MDCS
uint32_t TU::getCoefScanIdx(const TransformUnit &tu, const ComponentID &compID)
{
  //------------------------------------------------

  //this mechanism is available for intra only

  if( !CU::isIntra( *tu.cu ) )
  {
    return SCAN_DIAG;
  }

  //------------------------------------------------

  //check that MDCS can be used for this TU


  const CompArea &area      = tu.blocks[compID];
  const SPS &sps            = *tu.cs->sps;
  const ChromaFormat format = sps.getChromaFormatIdc();


  const uint32_t maximumWidth  = MDCS_MAXIMUM_WIDTH  >> getComponentScaleX(compID, format);
  const uint32_t maximumHeight = MDCS_MAXIMUM_HEIGHT >> getComponentScaleY(compID, format);

  if ((area.width > maximumWidth) || (area.height > maximumHeight))
  {
    return SCAN_DIAG;
  }

  //------------------------------------------------

  //otherwise, select the appropriate mode

  const PredictionUnit &pu = *tu.cs->getPU( area.pos(), toChannelType( compID ) );

  uint32_t uiDirMode = PU::getFinalIntraMode(pu, toChannelType(compID));

  //------------------

       if (abs((int) uiDirMode - VER_IDX) <= MDCS_ANGLE_LIMIT)
  {
    return SCAN_HOR;
  }
  else if (abs((int) uiDirMode - HOR_IDX) <= MDCS_ANGLE_LIMIT)
  {
    return SCAN_VER;
  }
  else
  {
    return SCAN_DIAG;
  }
}

#endif
bool TU::hasCrossCompPredInfo( const TransformUnit &tu, const ComponentID &compID )
{
  return ( isChroma(compID) && tu.cs->pps->getPpsRangeExtension().getCrossComponentPredictionEnabledFlag() && TU::getCbf( tu, COMPONENT_Y ) &&
         ( CU::isInter(*tu.cu) || PU::isChromaIntraModeCrossCheckMode( *tu.cs->getPU( tu.blocks[compID].pos(), toChannelType( compID ) ) ) ) );
}

uint32_t TU::getNumNonZeroCoeffsNonTS( const TransformUnit& tu, const bool bLuma, const bool bChroma )
{
  uint32_t count = 0;
  for( uint32_t i = 0; i < ::getNumberValidTBlocks( *tu.cs->pcv ); i++ )
  {
#if JVET_M0464_UNI_MTS
    if( tu.blocks[i].valid() && ( isLuma(ComponentID(i)) ? tu.mtsIdx !=1 : true ) && TU::getCbf( tu, ComponentID( i ) ) )
#else
    if( tu.blocks[i].valid() && !tu.transformSkip[i] && TU::getCbf( tu, ComponentID( i ) ) )
#endif
    {
      if( isLuma  ( tu.blocks[i].compID ) && !bLuma   ) continue;
      if( isChroma( tu.blocks[i].compID ) && !bChroma ) continue;

      uint32_t area = tu.blocks[i].area();
      const TCoeff* coeff = tu.getCoeffs( ComponentID( i ) ).buf;
      for( uint32_t j = 0; j < area; j++ )
      {
        count += coeff[j] != 0;
      }
    }
  }
  return count;
}

bool TU::needsSqrt2Scale( const Size& size )
{
  return (((g_aucLog2[size.width] + g_aucLog2[size.height]) & 1) == 1);
}

#if HM_QTBT_AS_IN_JEM_QUANT

bool TU::needsBlockSizeTrafoScale( const Size& size )
{
  return needsSqrt2Scale( size ) || isNonLog2BlockSize( size );
}
#else
bool TU::needsQP3Offset(const TransformUnit &tu, const ComponentID &compID)
{
  if( !tu.transformSkip[compID] )
  {
    return ( ( ( g_aucLog2[tu.blocks[compID].width] + g_aucLog2[tu.blocks[compID].height] ) & 1 ) == 1 );
  }
  return false;
}
#endif





// other tools

uint32_t getCtuAddr( const Position& pos, const PreCalcValues& pcv )
{
  return ( pos.x >> pcv.maxCUWidthLog2 ) + ( pos.y >> pcv.maxCUHeightLog2 ) * pcv.widthInCtus;
}