UnitTools.cpp

      }

      mi.interDir = (mi.refIdx[0] != -1 ? 1 : 0) + (mi.refIdx[1] != -1 ? 2 : 0);

      if (isBiPred && mi.interDir == 3)
      {
        mi.interDir = 1;
        mi.mv[1] = Mv();
        mi.refIdx[1] = NOT_VALID;
      }

      mb.subBuf(g_miScaling.scale(Position{ x, y } -pu.lumaPos()), g_miScaling.scale(Size(puWidth, puHeight))).fill(mi);
      }
    }
  }
  return true;
}

void PU::spanMotionInfo( PredictionUnit &pu, const MergeCtx &mrgCtx )
{
  MotionBuf mb = pu.getMotionBuf();

  if( !pu.mergeFlag || pu.mergeType == MRG_TYPE_DEFAULT_N
    || pu.mergeType == MRG_TYPE_IBC
    )
  {
    MotionInfo mi;

    mi.isInter = !CU::isIntra(*pu.cu);
    mi.isIBCmot = CU::isIBC(*pu.cu);
    mi.sliceIdx = pu.cu->slice->getIndependentSliceIdx();

    if( mi.isInter )
    {
      mi.interDir = pu.interDir;
      mi.useAltHpelIf = pu.cu->imv == IMV_HPEL;

      for( int i = 0; i < NUM_REF_PIC_LIST_01; i++ )
      {
        mi.mv[i]     = pu.mv[i];
        mi.refIdx[i] = pu.refIdx[i];
      }
      if (mi.isIBCmot)
      {
        mi.bv = pu.bv;
      }
    }

    if( pu.cu->affine )
    {
      for( int y = 0; y < mb.height; y++ )
      {
        for( int x = 0; x < mb.width; x++ )
        {
          MotionInfo &dest = mb.at( x, y );
          dest.isInter  = mi.isInter;
          dest.isIBCmot = false;
          dest.interDir = mi.interDir;
          dest.sliceIdx = mi.sliceIdx;
          for( int i = 0; i < NUM_REF_PIC_LIST_01; i++ )
          {
            if( mi.refIdx[i] == -1 )
            {
              dest.mv[i] = Mv();
            }
            dest.refIdx[i] = mi.refIdx[i];
          }
        }
      }
    }
    else
    {
      mb.fill( mi );
    }
  }
  else if (pu.mergeType == MRG_TYPE_SUBPU_ATMVP)
  {
    CHECK(mrgCtx.subPuMvpMiBuf.area() == 0 || !mrgCtx.subPuMvpMiBuf.buf, "Buffer not initialized");
    mb.copyFrom(mrgCtx.subPuMvpMiBuf);
  }
  else
  {

    if( isBipredRestriction( pu ) )
    {
      for( int y = 0; y < mb.height; y++ )
      {
        for( int x = 0; x < mb.width; x++ )
        {
          MotionInfo &mi = mb.at( x, y );
          if( mi.interDir == 3 )
          {
            mi.interDir  = 1;
            mi.mv    [1] = Mv();
            mi.refIdx[1] = NOT_VALID;
          }
        }
      }
    }
  }
}

void PU::applyImv( PredictionUnit& pu, MergeCtx &mrgCtx, InterPrediction *interPred )
{
  if( !pu.mergeFlag )
  {
    if( pu.interDir != 2 /* PRED_L1 */ )
    {
      pu.mvd[0].changeTransPrecAmvr2Internal(pu.cu->imv);
      unsigned mvp_idx = pu.mvpIdx[0];
      AMVPInfo amvpInfo;
      if (CU::isIBC(*pu.cu))
      {
        PU::fillIBCMvpCand(pu, amvpInfo);
      }
      else
      PU::fillMvpCand(pu, REF_PIC_LIST_0, pu.refIdx[0], amvpInfo);
      pu.mvpNum[0] = amvpInfo.numCand;
      pu.mvpIdx[0] = mvp_idx;
      pu.mv    [0] = amvpInfo.mvCand[mvp_idx] + pu.mvd[0];
      pu.mv[0].mvCliptoStorageBitDepth();
    }

    if (pu.interDir != 1 /* PRED_L0 */)
    {
      if( !( pu.cu->cs->picHeader->getMvdL1ZeroFlag() && pu.interDir == 3 ) && pu.cu->imv )/* PRED_BI */
      {
        pu.mvd[1].changeTransPrecAmvr2Internal(pu.cu->imv);
      }
      unsigned mvp_idx = pu.mvpIdx[1];
      AMVPInfo amvpInfo;
      PU::fillMvpCand(pu, REF_PIC_LIST_1, pu.refIdx[1], amvpInfo);
      pu.mvpNum[1] = amvpInfo.numCand;
      pu.mvpIdx[1] = mvp_idx;
      pu.mv    [1] = amvpInfo.mvCand[mvp_idx] + pu.mvd[1];
      pu.mv[1].mvCliptoStorageBitDepth();
    }
  }
  else
  {
    // this function is never called for merge
    THROW("unexpected");
    PU::getInterMergeCandidates ( pu, mrgCtx
      , 0
    );

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

  PU::spanMotionInfo( pu, mrgCtx );
}


bool PU::isBiPredFromDifferentDirEqDistPoc(const PredictionUnit& pu)
{
  if (pu.refIdx[0] >= 0 && pu.refIdx[1] >= 0)
  {
    if (pu.cu->slice->getRefPic(REF_PIC_LIST_0, pu.refIdx[0])->longTerm
      || pu.cu->slice->getRefPic(REF_PIC_LIST_1, pu.refIdx[1])->longTerm)
    {
      return false;
    }
    const int poc0 = pu.cu->slice->getRefPOC(REF_PIC_LIST_0, pu.refIdx[0]);
    const int poc1 = pu.cu->slice->getRefPOC(REF_PIC_LIST_1, pu.refIdx[1]);
    const int poc = pu.cu->slice->getPOC();
    if ((poc - poc0)*(poc - poc1) < 0)
    {
      if (abs(poc - poc0) == abs(poc - poc1))
      {
        return true;
      }
    }
  }
  return false;
}

void PU::restrictBiPredMergeCandsOne(PredictionUnit &pu)
{
  if (PU::isBipredRestriction(pu))
  {
    if (pu.interDir == 3)
    {
      pu.interDir = 1;
      pu.refIdx[1] = -1;
      pu.mv[1] = Mv(0, 0);
      pu.cu->BcwIdx = BCW_DEFAULT;
    }
  }
}

void PU::getGeoMergeCandidates( const PredictionUnit &pu, MergeCtx& geoMrgCtx )
{
  MergeCtx tmpMergeCtx;


  const uint32_t maxNumMergeCand = pu.cs->sps->getMaxNumMergeCand();
  geoMrgCtx.numValidMergeCand = 0;

  for (int32_t i = 0; i < GEO_MAX_NUM_UNI_CANDS; i++)
  {
    geoMrgCtx.BcwIdx[i] = BCW_DEFAULT;
    geoMrgCtx.interDirNeighbours[i] = 0;
    geoMrgCtx.mrgTypeNeighbours[i] = MRG_TYPE_DEFAULT_N;
    geoMrgCtx.mvFieldNeighbours[(i << 1)].refIdx = NOT_VALID;
    geoMrgCtx.mvFieldNeighbours[(i << 1) + 1].refIdx = NOT_VALID;
    geoMrgCtx.mvFieldNeighbours[(i << 1)].mv = Mv();
    geoMrgCtx.mvFieldNeighbours[(i << 1) + 1].mv = Mv();
    geoMrgCtx.useAltHpelIf[i] = false;
  }

  PU::getInterMergeCandidates(pu, tmpMergeCtx, 0);

  for (int32_t i = 0; i < maxNumMergeCand; i++)
  {
    int parity = i & 1;
    if( tmpMergeCtx.interDirNeighbours[i] & (0x01 + parity) )
    {
      geoMrgCtx.interDirNeighbours[geoMrgCtx.numValidMergeCand] = 1 + parity;
      geoMrgCtx.mrgTypeNeighbours[geoMrgCtx.numValidMergeCand] = MRG_TYPE_DEFAULT_N;
      geoMrgCtx.mvFieldNeighbours[(geoMrgCtx.numValidMergeCand << 1) + !parity].mv = Mv(0, 0);
      geoMrgCtx.mvFieldNeighbours[(geoMrgCtx.numValidMergeCand << 1) + parity].mv = tmpMergeCtx.mvFieldNeighbours[(i << 1) + parity].mv;
      geoMrgCtx.mvFieldNeighbours[(geoMrgCtx.numValidMergeCand << 1) + !parity].refIdx = -1;
      geoMrgCtx.mvFieldNeighbours[(geoMrgCtx.numValidMergeCand << 1) + parity].refIdx = tmpMergeCtx.mvFieldNeighbours[(i << 1) + parity].refIdx;
      geoMrgCtx.numValidMergeCand++;
      if (geoMrgCtx.numValidMergeCand == GEO_MAX_NUM_UNI_CANDS)
      {
        return;
      }
      continue;
    }

    if (tmpMergeCtx.interDirNeighbours[i] & (0x02 - parity))
    {
      geoMrgCtx.interDirNeighbours[geoMrgCtx.numValidMergeCand] = 2 - parity;
      geoMrgCtx.mrgTypeNeighbours[geoMrgCtx.numValidMergeCand] = MRG_TYPE_DEFAULT_N;
      geoMrgCtx.mvFieldNeighbours[(geoMrgCtx.numValidMergeCand << 1) + !parity].mv = tmpMergeCtx.mvFieldNeighbours[(i << 1) + !parity].mv;
      geoMrgCtx.mvFieldNeighbours[(geoMrgCtx.numValidMergeCand << 1) + parity].mv = Mv(0, 0);
      geoMrgCtx.mvFieldNeighbours[(geoMrgCtx.numValidMergeCand << 1) + !parity].refIdx = tmpMergeCtx.mvFieldNeighbours[(i << 1) + !parity].refIdx;
      geoMrgCtx.mvFieldNeighbours[(geoMrgCtx.numValidMergeCand << 1) + parity].refIdx = -1;
      geoMrgCtx.numValidMergeCand++;
      if (geoMrgCtx.numValidMergeCand == GEO_MAX_NUM_UNI_CANDS)
      {
        return;
      }
    }
  }
}

void PU::spanGeoMotionInfo( PredictionUnit &pu, MergeCtx &geoMrgCtx, const uint8_t splitDir, const uint8_t candIdx0, const uint8_t candIdx1)
{
  pu.geoSplitDir  = splitDir;
  pu.geoMergeIdx0 = candIdx0;
  pu.geoMergeIdx1 = candIdx1;
  MotionBuf mb = pu.getMotionBuf();

  MotionInfo biMv;
  biMv.isInter  = true;
  biMv.sliceIdx = pu.cs->slice->getIndependentSliceIdx();

  if( geoMrgCtx.interDirNeighbours[candIdx0] == 1 && geoMrgCtx.interDirNeighbours[candIdx1] == 2 )
  {
    biMv.interDir  = 3;
    biMv.mv[0]     = geoMrgCtx.mvFieldNeighbours[ candIdx0 << 1     ].mv;
    biMv.mv[1]     = geoMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].mv;
    biMv.refIdx[0] = geoMrgCtx.mvFieldNeighbours[ candIdx0 << 1     ].refIdx;
    biMv.refIdx[1] = geoMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].refIdx;
  }
  else if( geoMrgCtx.interDirNeighbours[candIdx0] == 2 && geoMrgCtx.interDirNeighbours[candIdx1] == 1 )
  {
    biMv.interDir  = 3;
    biMv.mv[0]     = geoMrgCtx.mvFieldNeighbours[ candIdx1 << 1     ].mv;
    biMv.mv[1]     = geoMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].mv;
    biMv.refIdx[0] = geoMrgCtx.mvFieldNeighbours[ candIdx1 << 1     ].refIdx;
    biMv.refIdx[1] = geoMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].refIdx;
  }
  else if( geoMrgCtx.interDirNeighbours[candIdx0] == 1 && geoMrgCtx.interDirNeighbours[candIdx1] == 1 )
  {
    biMv.interDir = 1;
    biMv.mv[0] = geoMrgCtx.mvFieldNeighbours[candIdx1 << 1].mv;
    biMv.mv[1] = Mv(0, 0);
    biMv.refIdx[0] = geoMrgCtx.mvFieldNeighbours[candIdx1 << 1].refIdx;
    biMv.refIdx[1] = -1;
  }
  else if( geoMrgCtx.interDirNeighbours[candIdx0] == 2 && geoMrgCtx.interDirNeighbours[candIdx1] == 2 )
  {
    biMv.interDir = 2;
    biMv.mv[0] = Mv(0, 0);
    biMv.mv[1] = geoMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].mv;
    biMv.refIdx[0] = -1;
    biMv.refIdx[1] = geoMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].refIdx;
  }

  int16_t angle = g_GeoParams[splitDir][0];
  int tpmMask = 0;
  int lookUpY = 0, motionIdx = 0;
  bool isFlip = angle >= 13 && angle <= 27;
  int distanceIdx = g_GeoParams[splitDir][1];
  int distanceX = angle;
  int distanceY = (distanceX + (GEO_NUM_ANGLES >> 2)) % GEO_NUM_ANGLES;
  int offsetX = (-(int)pu.lwidth()) >> 1;
  int offsetY = (-(int)pu.lheight()) >> 1;
  if (distanceIdx > 0)
  {
    if (angle % 16 == 8 || (angle % 16 != 0 && pu.lheight() >= pu.lwidth()))
      offsetY += angle < 16 ? ((distanceIdx * pu.lheight()) >> 3) : -(int)((distanceIdx * pu.lheight()) >> 3);
    else
      offsetX += angle < 16 ? ((distanceIdx * pu.lwidth()) >> 3) : -(int)((distanceIdx * pu.lwidth()) >> 3);
  }
  for (int y = 0; y < mb.height; y++)
  {
    lookUpY = (((4 * y + offsetY) << 1) + 5) * g_Dis[distanceY];
    for (int x = 0; x < mb.width; x++)
    {
      motionIdx = (((4 * x + offsetX) << 1) + 5) * g_Dis[distanceX] + lookUpY;
      tpmMask = abs(motionIdx) < 32 ? 2 : (motionIdx <= 0 ? (1 - isFlip) : isFlip);
      if (tpmMask == 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];
        mb.at(x, y).sliceIdx = biMv.sliceIdx;
      }
      else if (tpmMask == 0)
      {
        mb.at(x, y).isInter = true;
        mb.at(x, y).interDir = geoMrgCtx.interDirNeighbours[candIdx0];
        mb.at(x, y).refIdx[0] = geoMrgCtx.mvFieldNeighbours[candIdx0 << 1].refIdx;
        mb.at(x, y).refIdx[1] = geoMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].refIdx;
        mb.at(x, y).mv[0] = geoMrgCtx.mvFieldNeighbours[candIdx0 << 1].mv;
        mb.at(x, y).mv[1] = geoMrgCtx.mvFieldNeighbours[(candIdx0 << 1) + 1].mv;
        mb.at(x, y).sliceIdx = biMv.sliceIdx;
      }
      else
      {
        mb.at(x, y).isInter = true;
        mb.at(x, y).interDir = geoMrgCtx.interDirNeighbours[candIdx1];
        mb.at(x, y).refIdx[0] = geoMrgCtx.mvFieldNeighbours[candIdx1 << 1].refIdx;
        mb.at(x, y).refIdx[1] = geoMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].refIdx;
        mb.at(x, y).mv[0] = geoMrgCtx.mvFieldNeighbours[candIdx1 << 1].mv;
        mb.at(x, y).mv[1] = geoMrgCtx.mvFieldNeighbours[(candIdx1 << 1) + 1].mv;
        mb.at(x, y).sliceIdx = biMv.sliceIdx;
      }
    }
  }
}

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->picHeader->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;
}

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->picHeader->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;
}

uint8_t CU::getSbtInfo( uint8_t idx, uint8_t pos )
{
  return ( pos << 4 ) + ( idx << 0 );
}

uint8_t CU::getSbtIdx( const uint8_t sbtInfo )
{
  return ( sbtInfo >> 0 ) & 0xf;
}

uint8_t CU::getSbtPos( const uint8_t sbtInfo )
{
  return ( sbtInfo >> 4 ) & 0x3;
}

uint8_t CU::getSbtMode( uint8_t sbtIdx, uint8_t sbtPos )
{
  uint8_t sbtMode = 0;
  switch( sbtIdx )
  {
  case SBT_VER_HALF: sbtMode = sbtPos + SBT_VER_H0;  break;
  case SBT_HOR_HALF: sbtMode = sbtPos + SBT_HOR_H0;  break;
  case SBT_VER_QUAD: sbtMode = sbtPos + SBT_VER_Q0;  break;
  case SBT_HOR_QUAD: sbtMode = sbtPos + SBT_HOR_Q0;  break;
  default:           assert( 0 );
  }

  assert( sbtMode < NUMBER_SBT_MODE );
  return sbtMode;
}

uint8_t CU::getSbtIdxFromSbtMode( uint8_t sbtMode )
{
  if( sbtMode <= SBT_VER_H1 )
    return SBT_VER_HALF;
  else if( sbtMode <= SBT_HOR_H1 )
    return SBT_HOR_HALF;
  else if( sbtMode <= SBT_VER_Q1 )
    return SBT_VER_QUAD;
  else if( sbtMode <= SBT_HOR_Q1 )
    return SBT_HOR_QUAD;
  else
  {
    assert( 0 );
    return 0;
  }
}

uint8_t CU::getSbtPosFromSbtMode( uint8_t sbtMode )
{
  if( sbtMode <= SBT_VER_H1 )
    return sbtMode - SBT_VER_H0;
  else if( sbtMode <= SBT_HOR_H1 )
    return sbtMode - SBT_HOR_H0;
  else if( sbtMode <= SBT_VER_Q1 )
    return sbtMode - SBT_VER_Q0;
  else if( sbtMode <= SBT_HOR_Q1 )
    return sbtMode - SBT_HOR_Q0;
  else
  {
    assert( 0 );
    return 0;
  }
}

uint8_t CU::targetSbtAllowed( uint8_t sbtIdx, uint8_t sbtAllowed )
{
  uint8_t val = 0;
  switch( sbtIdx )
  {
  case SBT_VER_HALF: val = ( ( sbtAllowed >> SBT_VER_HALF ) & 0x1 ); break;
  case SBT_HOR_HALF: val = ( ( sbtAllowed >> SBT_HOR_HALF ) & 0x1 ); break;
  case SBT_VER_QUAD: val = ( ( sbtAllowed >> SBT_VER_QUAD ) & 0x1 ); break;
  case SBT_HOR_QUAD: val = ( ( sbtAllowed >> SBT_HOR_QUAD ) & 0x1 ); break;
  default:           CHECK( 1, "unknown SBT type" );
  }
  return val;
}

uint8_t CU::numSbtModeRdo( uint8_t sbtAllowed )
{
  uint8_t num = 0;
  uint8_t sum = 0;
  num = targetSbtAllowed( SBT_VER_HALF, sbtAllowed ) + targetSbtAllowed( SBT_HOR_HALF, sbtAllowed );
  sum += std::min( SBT_NUM_RDO, ( num << 1 ) );
  num = targetSbtAllowed( SBT_VER_QUAD, sbtAllowed ) + targetSbtAllowed( SBT_HOR_QUAD, sbtAllowed );
  sum += std::min( SBT_NUM_RDO, ( num << 1 ) );
  return sum;
}

bool CU::isSbtMode( const uint8_t sbtInfo )
{
  uint8_t sbtIdx = getSbtIdx( sbtInfo );
  return sbtIdx >= SBT_VER_HALF && sbtIdx <= SBT_HOR_QUAD;
}

bool CU::isSameSbtSize( const uint8_t sbtInfo1, const uint8_t sbtInfo2 )
{
  uint8_t sbtIdx1 = getSbtIdxFromSbtMode( sbtInfo1 );
  uint8_t sbtIdx2 = getSbtIdxFromSbtMode( sbtInfo2 );
  if( sbtIdx1 == SBT_HOR_HALF || sbtIdx1 == SBT_VER_HALF )
    return sbtIdx2 == SBT_HOR_HALF || sbtIdx2 == SBT_VER_HALF;
  else if( sbtIdx1 == SBT_HOR_QUAD || sbtIdx1 == SBT_VER_QUAD )
    return sbtIdx2 == SBT_HOR_QUAD || sbtIdx2 == SBT_VER_QUAD;
  else
    return false;
}

bool CU::isPredRegDiffFromTB(const CodingUnit &cu, const ComponentID compID)
{
  return (compID == COMPONENT_Y)
    && (cu.ispMode == VER_INTRA_SUBPARTITIONS &&
      CU::isMinWidthPredEnabledForBlkSize(cu.blocks[compID].width, cu.blocks[compID].height)
      );
}

bool CU::isMinWidthPredEnabledForBlkSize(const int w, const int h)
{
  return ((w == 8 && h > 4) || w == 4);
}

bool CU::isFirstTBInPredReg(const CodingUnit& cu, const ComponentID compID, const CompArea &area)
{
  return (compID == COMPONENT_Y) && cu.ispMode && ((area.topLeft().x - cu.Y().topLeft().x) % PRED_REG_MIN_WIDTH == 0);
}

void CU::adjustPredArea(CompArea &area)
{
  area.width = std::max<int>(PRED_REG_MIN_WIDTH, area.width);
}

bool CU::isBcwIdxCoded( const CodingUnit &cu )
{
  if( cu.cs->sps->getUseBcw() == false )
  {
    CHECK(cu.BcwIdx != BCW_DEFAULT, "Error: cu.BcwIdx != BCW_DEFAULT");
    return false;
  }

  if (cu.predMode == MODE_IBC)
  {
    return false;
  }

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

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

  if( !cu.firstPU->mergeFlag )
  {
    if( cu.firstPU->interDir == 3 )
    {
      WPScalingParam *wp0;
      WPScalingParam *wp1;
      int refIdx0 = cu.firstPU->refIdx[REF_PIC_LIST_0];
      int refIdx1 = cu.firstPU->refIdx[REF_PIC_LIST_1];

      cu.cs->slice->getWpScaling(REF_PIC_LIST_0, refIdx0, wp0);
      cu.cs->slice->getWpScaling(REF_PIC_LIST_1, refIdx1, wp1);
      if ((wp0[COMPONENT_Y].bPresentFlag || wp0[COMPONENT_Cb].bPresentFlag || wp0[COMPONENT_Cr].bPresentFlag
        || wp1[COMPONENT_Y].bPresentFlag || wp1[COMPONENT_Cb].bPresentFlag || wp1[COMPONENT_Cr].bPresentFlag))
      {
        return false;
      }
      return true;
    }
  }

  return false;
}

uint8_t CU::getValidBcwIdx( const CodingUnit &cu )
{
  if( cu.firstPU->interDir == 3 && !cu.firstPU->mergeFlag )
  {
    return cu.BcwIdx;
  }
  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.BcwIdx != BCW_DEFAULT, " cu.BcwIdx != BCW_DEFAULT ");
  }
  else
  {
    CHECK(cu.BcwIdx != BCW_DEFAULT, " cu.BcwIdx != BCW_DEFAULT ");
  }

  return BCW_DEFAULT;
}

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

  if( cu.firstPU->interDir == 3 && !cu.firstPU->mergeFlag )
  {
    cu.BcwIdx = 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.BcwIdx = BCW_DEFAULT;
  }
  else
  {
    cu.BcwIdx = BCW_DEFAULT;
  }

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

uint8_t CU::deriveBcwIdx( uint8_t bcwLO, uint8_t bcwL1 )
{
  if( bcwLO == bcwL1 )
  {
    return bcwLO;
  }
  const int8_t w0 = getBcwWeight(bcwLO, REF_PIC_LIST_0);
  const int8_t w1 = getBcwWeight(bcwL1, REF_PIC_LIST_1);
  const int8_t th = g_BcwWeightBase >> 1;
  const int8_t off = 1;

  if( w0 == w1 || (w0 < (th - off) && w1 < (th - off)) || (w0 >(th + off) && w1 >(th + off)) )
  {
    return BCW_DEFAULT;
  }
  else
  {
    if( w0 > w1 )
    {
      return ( w0 >= th ? bcwLO : bcwL1 );
    }
    else
    {
      return ( w1 >= th ? bcwL1 : bcwLO );
    }
  }
}

bool CU::bdpcmAllowed( const CodingUnit& cu, const ComponentID compID )
{
  SizeType transformSkipMaxSize = 1 << cu.cs->sps->getLog2MaxTransformSkipBlockSize();

  bool bdpcmAllowed = cu.cs->sps->getBDPCMEnabledFlag();
       bdpcmAllowed &= CU::isIntra( cu );
       if (isLuma(compID))
           bdpcmAllowed &= (cu.lwidth() <= transformSkipMaxSize && cu.lheight() <= transformSkipMaxSize);
       else
           bdpcmAllowed &= (cu.chromaSize().width <= transformSkipMaxSize && cu.chromaSize().height <= transformSkipMaxSize) && !cu.colorTransform;
  return bdpcmAllowed;
}

bool CU::isMTSAllowed(const CodingUnit &cu, const ComponentID compID)
{
  SizeType tsMaxSize = 1 << cu.cs->sps->getLog2MaxTransformSkipBlockSize();
  const int maxSize  = CU::isIntra( cu ) ? MTS_INTRA_MAX_CU_SIZE : MTS_INTER_MAX_CU_SIZE;
  const int cuWidth  = cu.blocks[0].lumaSize().width;
  const int cuHeight = cu.blocks[0].lumaSize().height;
  bool mtsAllowed    = cu.chType == CHANNEL_TYPE_LUMA && compID == COMPONENT_Y;

  mtsAllowed &= CU::isIntra( cu ) ? cu.cs->sps->getUseIntraMTS() : cu.cs->sps->getUseInterMTS() && CU::isInter( cu );
  mtsAllowed &= cuWidth <= maxSize && cuHeight <= maxSize;
  mtsAllowed &= !cu.ispMode;
  mtsAllowed &= !cu.sbtInfo;
  mtsAllowed &= !(cu.bdpcmMode && cuWidth <= tsMaxSize && cuHeight <= tsMaxSize);
  return mtsAllowed;
}

// TU tools

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)
{
  if( !tu.blocks[compID].valid() )
    CHECK( tu.cbf[compID] != 0, "cbf must be 0 if the component is not available" );
  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);
}

bool TU::isTSAllowed(const TransformUnit &tu, const ComponentID compID)
{
  const int maxSize = tu.cs->sps->getLog2MaxTransformSkipBlockSize();

  bool tsAllowed = tu.cs->sps->getTransformSkipEnabledFlag();
  tsAllowed &= ( !tu.cu->ispMode || !isLuma(compID) );
  SizeType transformSkipMaxSize = 1 << maxSize;
  tsAllowed &= !(tu.cu->bdpcmMode && isLuma(compID));
  tsAllowed &= !(tu.cu->bdpcmModeChroma && isChroma(compID));
  tsAllowed &= tu.blocks[compID].width <= transformSkipMaxSize && tu.blocks[compID].height <= transformSkipMaxSize;
  tsAllowed &= !tu.cu->sbtInfo;

  return tsAllowed;
}


int TU::getICTMode( const TransformUnit& tu, int jointCbCr )
{
  if( jointCbCr < 0 )
  {
    jointCbCr = tu.jointCbCr;
  }
  return g_ictModes[ tu.cs->picHeader->getJointCbCrSignFlag() ][ jointCbCr ];
}


bool TU::needsSqrt2Scale( const TransformUnit &tu, const ComponentID &compID )
{
  const Size &size=tu.blocks[compID];
  const bool isTransformSkip = (tu.mtsIdx[compID] == MTS_SKIP);
  return (!isTransformSkip) && (((floorLog2(size.width) + floorLog2(size.height)) & 1) == 1);
}

bool TU::needsBlockSizeTrafoScale( const TransformUnit &tu, const ComponentID &compID )
{
  return needsSqrt2Scale( tu, compID ) || isNonLog2BlockSize( tu.blocks[compID] );
}

TransformUnit* TU::getPrevTU( const TransformUnit &tu, const ComponentID compID )
{
  TransformUnit* prevTU = tu.prev;

  if( prevTU != nullptr && ( prevTU->cu != tu.cu || !prevTU->blocks[compID].valid() ) )
  {
    prevTU = nullptr;
  }

  return prevTU;
}

bool TU::getPrevTuCbfAtDepth( const TransformUnit &currentTu, const ComponentID compID, const int trDepth )
{
  const TransformUnit* prevTU = getPrevTU( currentTu, compID );
  return ( prevTU != nullptr ) ? TU::getCbfAtDepth( *prevTU, compID, trDepth ) : false;
}


// other tools

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

int getNumModesMip(const Size& block)
{
  switch( getMipSizeId(block) )
  {
  case 0: return 16;
  case 1: return  8;
  case 2: return  6;
  default: THROW( "Invalid mipSizeId" );
  }
}


int getMipSizeId(const Size& block)
{
  if( block.width == 4 && block.height == 4 )
  {
    return 0;
  }
  else if( block.width == 4 || block.height == 4 || (block.width == 8 && block.height == 8) )
  {
    return 1;
  }
  else
  {
    return 2;
  }

}

bool allowLfnstWithMip(const Size& block)
{
  if (block.width >= 16 && block.height >= 16)
  {
    return true;
  }
  return false;
}