UnitTools.cpp

  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];
        mb.at( x, y ).sliceIdx  = biMv.sliceIdx;
      }
      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;
        mb.at( x, y ).sliceIdx  = biMv.sliceIdx;
      }
      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;
        mb.at( x, y ).sliceIdx  = biMv.sliceIdx;
      }
    }
  }
}

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;
        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;

        mvPred       = amvpInfo.mvCand[pu.mvpIdx[0]];
        mv.roundTransPrecInternal2Amvr(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.roundTransPrecInternal2Amvr(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
        );

        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;
}

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;
}

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

  // Get BCBP of left PU
  const CodingUnit *cuLeft  = cs.getCURestricted( pos.offset( -1, 0 ), pos, cs.slice->getIndependentSliceIdx(), cs.picture->brickMap->getBrickIdxRsMap( pos ), CH_L );
  maxImvNumCand = ( cuLeft ) ? cuLeft->imvNumCand : numDefault;

  // Get BCBP of above PU
  const CodingUnit *cuAbove = cs.getCURestricted( pos.offset( 0, -1 ), pos, cs.slice->getIndependentSliceIdx(), cs.picture->brickMap->getBrickIdxRsMap( pos ), CH_L );
  maxImvNumCand = std::max( maxImvNumCand, ( cuAbove ) ? cuAbove->imvNumCand : numDefault );

  return maxImvNumCand;
}

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::isMtsMode( const uint8_t sbtInfo )
{
  return getSbtIdx( sbtInfo ) == SBT_OFF_MTS;
}

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

bool CU::bdpcmAllowed( const CodingUnit& cu, const ComponentID compID )
{
  bool bdpcmAllowed = compID == COMPONENT_Y;
       bdpcmAllowed &= CU::isIntra( cu );
       bdpcmAllowed &= ( cu.lwidth() <= 32 && cu.lheight() <= 32 );

  return bdpcmAllowed;
}
// 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)
{
  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)
{
  bool    tsAllowed = compID == COMPONENT_Y;
  const int maxSize = tu.cs->pps->getPpsRangeExtension().getLog2MaxTransformSkipBlockSize();

  tsAllowed &= tu.cs->pps->getUseTransformSkip();
  tsAllowed &= !tu.cu->transQuantBypass;
  tsAllowed &= ( !tu.cu->ispMode || !isLuma(compID) );
  tsAllowed &= !( tu.cu->bdpcmMode && tu.lwidth() <= BDPCM_MAX_CU_SIZE && tu.lheight() <= BDPCM_MAX_CU_SIZE );
  SizeType transformSkipMaxSize = 1 << maxSize;
  tsAllowed &= tu.lwidth() <= transformSkipMaxSize && tu.lheight() <= transformSkipMaxSize;
  tsAllowed &= !tu.cu->sbtInfo;

  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->getUseIntraMTS() : tu.cs->sps->getUseInterMTS() && CU::isInter( *tu.cu );
  mtsAllowed &= ( tu.lwidth() <= maxSize && tu.lheight() <= maxSize );
  mtsAllowed &= !tu.cu->ispMode;
  mtsAllowed &= !tu.cu->sbtInfo;
  mtsAllowed &= !( tu.cu->bdpcmMode && tu.lwidth() <= BDPCM_MAX_CU_SIZE && tu.lheight() <= BDPCM_MAX_CU_SIZE );
  return mtsAllowed;
}

uint32_t TU::getGolombRiceStatisticsIndex(const TransformUnit &tu, const ComponentID &compID)
{
  const bool transformSkip    = tu.mtsIdx==MTS_SKIP;
  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;
}

bool TU::hasCrossCompPredInfo( const TransformUnit &tu, const ComponentID &compID )
{
  return (isChroma(compID) && tu.cs->pps->getPpsRangeExtension().getCrossComponentPredictionEnabledFlag() && TU::getCbf(tu, COMPONENT_Y) &&
    (!CU::isIntra(*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( tu.blocks[ i ].valid() && tu.mtsIdx != MTS_SKIP && TU::getCbf( tu, ComponentID( i ) ) )
    {
      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;
}

uint32_t TU::getNumNonZeroCoeffsNonTSCorner8x8( const TransformUnit& tu, const bool lumaFlag, const bool chromaFlag )
{
  const uint32_t lumaWidth       = tu.blocks[ 0 ].width,  chromaWidth  = tu.blocks[ 1 ].width;
  const uint32_t lumaHeight      = tu.blocks[ 0 ].height, chromaHeight = tu.blocks[ 1 ].height;
  bool           luma4x4TUFlag   = lumaWidth     == 4 && lumaHeight   == 4;
  bool           chroma4x4TUFlag = chromaWidth   == 4 && chromaHeight == 4;
  bool           luma8x8TUFlag   = lumaWidth     == 8 && lumaHeight   == 8;
  bool           chroma8x8TUFlag = chromaWidth   == 8 && chromaHeight == 8;
  bool           lumaCountFlag   = ( lumaWidth   >= 8 && lumaHeight   >= 8 ) || luma4x4TUFlag;
  bool           chromaCountFlag = ( chromaWidth >= 8 && chromaHeight >= 8 ) || chroma4x4TUFlag;

  uint32_t count = 0;
  for( uint32_t i = 0; i < ::getNumberValidTBlocks( *tu.cs->pcv ); i++ )
  {
    if( tu.blocks[ i ].valid() && tu.mtsIdx != MTS_SKIP && TU::getCbf( tu, ComponentID( i ) ) )
    {
      if(   isLuma( tu.blocks[ i ].compID ) && (   !lumaFlag ||   !lumaCountFlag ) ) continue;
      if( isChroma( tu.blocks[ i ].compID ) && ( !chromaFlag || !chromaCountFlag ) ) continue;

      const ScanElement * scan  = g_coefTopLeftDiagScan8x8[ gp_sizeIdxInfo->idxFrom( tu.blocks[ i ].width ) ];
      const TCoeff*       coeff = tu.getCoeffs( ComponentID( i ) ).buf;

      int startPos = MAX_LFNST_COEF_NUM, endPos = 47;
      if( ( isLuma( tu.blocks[ i ].compID ) && luma4x4TUFlag ) || ( isChroma( tu.blocks[ i ].compID ) && chroma4x4TUFlag ) )
      {
        startPos = 8; endPos = 15;
      }
      else if( ( isLuma( tu.blocks[ i ].compID ) && luma8x8TUFlag ) || ( isChroma( tu.blocks[ i ].compID ) && chroma8x8TUFlag ) )
      {
        startPos = 8; endPos = 47;
      }
      const ScanElement *scanPtr = scan + startPos;
      for( uint32_t j = startPos; j <= endPos; j++ )
      {
        count += coeff[ scanPtr->idx ] != 0;
        scanPtr++;
      }
    }
  }
  return count;
}

bool TU::needsSqrt2Scale( const TransformUnit &tu, const ComponentID &compID )
{
  const Size &size=tu.blocks[compID];
  const bool isTransformSkip = tu.mtsIdx==MTS_SKIP && isLuma(compID);
  return (!isTransformSkip) && (((g_aucLog2[size.width] + g_aucLog2[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)
{
  if (block.width > (4 * block.height) || block.height > (4 * block.width))
  {
    return 0;
  }

  if( block.width == 4 && block.height == 4 )
  {
    return 35;
  }
  else if (block.width <= 8 && block.height <= 8)
  {
    return 19;
  }
  else
  {
    return 11;
  }
}

int getNumEpBinsMip(const Size& block)
{
  int numModes = getNumModesMip(block);
  return int(std::ceil((std::log2(numModes - NUM_MPM_MIP - 1))));
}

bool mipModesAvailable(const Size& block)
{
  return (getNumModesMip(block));
}