/src/vvenc/source/Lib/EncoderLib/IntraSearch.cpp

Source
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/** \file     EncSearch.cpp
 *  \brief    encoder intra search class
 */

#include "IntraSearch.h"
#include "EncPicture.h"
#include "CommonLib/CommonDef.h"
#include "CommonLib/Rom.h"
#include "CommonLib/Picture.h"
#include "CommonLib/UnitTools.h"
#include "CommonLib/dtrace_next.h"
#include "CommonLib/dtrace_buffer.h"
#include "CommonLib/Reshape.h"
#include <math.h>
#include "vvenc/vvencCfg.h"

//! \ingroup EncoderLib
//! \{

namespace vvenc {

#define PLTCtx(c) SubCtx( Ctx::Palette, c )

IntraSearch::IntraSearch()
  : m_pSaveCS       (nullptr)
  , m_pcEncCfg      (nullptr)
  , m_pcTrQuant     (nullptr)
  , m_pcRdCost      (nullptr)
  , m_CABACEstimator(nullptr)
  , m_CtxCache      (nullptr)
{
}

void IntraSearch::init(const VVEncCfg &encCfg, TrQuant *pTrQuant, RdCost *pRdCost, SortedPelUnitBufs<SORTED_BUFS> *pSortedPelUnitBufs, XUCache &unitCache )
{
  IntraPrediction::init( encCfg.m_internChromaFormat, encCfg.m_internalBitDepth[ CH_L ] );

  m_pcEncCfg          = &encCfg;
  m_pcTrQuant         = pTrQuant;
  m_pcRdCost          = pRdCost;
  m_SortedPelUnitBufs = pSortedPelUnitBufs;

  const ChromaFormat chrFormat = encCfg.m_internChromaFormat;
  const int maxCUSize          = encCfg.m_CTUSize;

  Area area = Area( 0, 0, maxCUSize, maxCUSize );

  m_pTempCS = new CodingStructure( unitCache, nullptr );
  m_pBestCS = new CodingStructure( unitCache, nullptr );

  m_pTempCS->createForSearch( chrFormat, area );
  m_pBestCS->createForSearch( chrFormat, area );

  const int uiNumSaveLayersToAllocate = 3;
  m_pSaveCS = new CodingStructure*[uiNumSaveLayersToAllocate];
  for( int layer = 0; layer < uiNumSaveLayersToAllocate; layer++ )
  {
    m_pSaveCS[ layer ] = new CodingStructure( unitCache, nullptr );
    m_pSaveCS[ layer ]->createForSearch( chrFormat, Area( 0, 0, maxCUSize, maxCUSize ) );
    m_pSaveCS[ layer ]->initStructData();
  }

  CompArea chromaArea( COMP_Cb, chrFormat, area, true );
  for( int i = 0; i < 5; i++ )
  {
    m_orgResiCb[i].create( chromaArea );
    m_orgResiCr[i].create( chromaArea );
  }
}

void IntraSearch::destroy()
{
  if ( m_pSaveCS )
  {
    const int uiNumSaveLayersToAllocate = 3;
    for( int layer = 0; layer < uiNumSaveLayersToAllocate; layer++ )
    {
      if ( m_pSaveCS[ layer ] ) { m_pSaveCS[ layer ]->destroy(); delete m_pSaveCS[ layer ]; }
    }
    delete[] m_pSaveCS;
    m_pSaveCS = nullptr;
  }

  if( m_pTempCS )
  {
    m_pTempCS->destroy();
    delete m_pTempCS; m_pTempCS = nullptr;
  }

  if( m_pBestCS )
  {
    m_pBestCS->destroy();
    delete m_pBestCS; m_pBestCS = nullptr;
  }
}

IntraSearch::~IntraSearch()
{
  destroy();
}

void IntraSearch::setCtuEncRsrc( CABACWriter* cabacEstimator, CtxCache *ctxCache )
{
  m_CABACEstimator = cabacEstimator;
  m_CtxCache       = ctxCache;
}

//////////////////////////////////////////////////////////////////////////
// INTRA PREDICTION
//////////////////////////////////////////////////////////////////////////
static constexpr double COST_UNKNOWN = -65536.0;

double IntraSearch::xFindInterCUCost( CodingUnit &cu )
{
  if( CU::isConsIntra(cu) && !cu.slice->isIntra() )
  {
    //search corresponding inter CU cost
    for( int i = 0; i < m_numCuInSCIPU; i++ )
    {
      if( cu.lumaPos() == m_cuAreaInSCIPU[i].pos() && cu.lumaSize() == m_cuAreaInSCIPU[i].size() )
      {
        return m_cuCostInSCIPU[i];
      }
    }
  }
  return COST_UNKNOWN;
}

void IntraSearch::xEstimateLumaRdModeList(int& numModesForFullRD,
  static_vector<ModeInfo, FAST_UDI_MAX_RDMODE_NUM>& RdModeList,
  static_vector<ModeInfo, FAST_UDI_MAX_RDMODE_NUM>& HadModeList,
  static_vector<double, FAST_UDI_MAX_RDMODE_NUM>& CandCostList,
  static_vector<double, FAST_UDI_MAX_RDMODE_NUM>& CandHadList, CodingUnit& cu, bool testMip )
{
  PROFILER_SCOPE_AND_STAGE_EXT( 1, _TPROF, P_INTRA_EST_RD_CAND, cu.cs, CH_L );
  const uint16_t intra_ctx_size = Ctx::IntraLumaMpmFlag.size() + Ctx::IntraLumaPlanarFlag.size() + Ctx::MultiRefLineIdx.size() + Ctx::ISPMode.size() + Ctx::MipFlag.size();
  const TempCtx  ctxStartIntraCtx(m_CtxCache, SubCtx(CtxSet(Ctx::IntraLumaMpmFlag(), intra_ctx_size), m_CABACEstimator->getCtx()));
  const double   sqrtLambdaForFirstPass = m_pcRdCost->getMotionLambda() * FRAC_BITS_SCALE;
  const int numModesAvailable = NUM_LUMA_MODE; // total number of Intra modes

  CHECK(numModesForFullRD >= numModesAvailable, "Too many modes for full RD search");

  const SPS& sps     = *cu.cs->sps;
  const bool fastMip = sps.MIP && m_pcEncCfg->m_useFastMIP;

  // this should always be true
  CHECK( !cu.Y().valid(), "CU is not valid" );

  const CompArea& area = cu.Y();

  const UnitArea localUnitArea(area.chromaFormat, Area(0, 0, area.width, area.height));
  if( testMip)
  {
    numModesForFullRD += fastMip ? numModesForFullRD - std::min( m_pcEncCfg->m_useFastMIP, numModesForFullRD )
                                 : numModesForFullRD;
    m_SortedPelUnitBufs->prepare( localUnitArea, numModesForFullRD + 1 );
  }
  else
  {
    m_SortedPelUnitBufs->prepare( localUnitArea, numModesForFullRD );
  }

  CPelBuf piOrg   = cu.cs->getOrgBuf(COMP_Y);
  PelBuf piPred  = m_SortedPelUnitBufs->getTestBuf(COMP_Y);

  const ReshapeData& reshapeData = cu.cs->picture->reshapeData;
  if (cu.cs->picHeader->lmcsEnabled && reshapeData.getCTUFlag())
  {
    piOrg = cu.cs->getRspOrgBuf();
  }
  DistParam distParam    = m_pcRdCost->setDistParam( piOrg, piPred, sps.bitDepths[ CH_L ], DF_HAD_2SAD); // Use HAD (SATD) cost

  const int numHadCand = (testMip ? 2 : 1) * 3;

  //*** Derive (regular) candidates using Hadamard
  cu.mipFlag = false;
  cu.multiRefIdx = 0;

  //===== init pattern for luma prediction =====
  initIntraPatternChType(cu, cu.Y(), true);

  bool satdChecked[NUM_INTRA_MODE] = { false };

  unsigned mpmLst[NUM_MOST_PROBABLE_MODES];
  CU::getIntraMPMs(cu, mpmLst);

  const int decMsk = ( 1 << m_pcEncCfg->m_IntraEstDecBit ) - 1;

  m_parentCandList.resize( 0 );
  m_parentCandList.reserve( ( numModesAvailable >> m_pcEncCfg->m_IntraEstDecBit ) + 2 );

  for( unsigned mode = 0; mode < numModesAvailable; mode++ )
  {
    // Skip checking extended Angular modes in the first round of SATD
    if( mode > DC_IDX && ( mode & decMsk ) )
    {
      continue;
    }

    m_parentCandList.push_back( ModeInfo( false, false, 0, NOT_INTRA_SUBPARTITIONS, mode ) );
  }
   
  for( int decDst = 1 << m_pcEncCfg->m_IntraEstDecBit; decDst > 0; decDst >>= 1 )
  {
    for( unsigned idx = 0; idx < m_parentCandList.size(); idx++ )
    {
      int modeParent = m_parentCandList[idx].modeId;

      int off = decDst & decMsk;
      int inc = decDst << 1;

#if 1 // INTRA_AS_IN_VTM
      if( off != 0 && ( modeParent <= ( DC_IDX + 1 ) || modeParent >= ( NUM_LUMA_MODE - 1 ) ) )
      {
        continue;
      }

#endif
      for( int mode = modeParent - off; mode < modeParent + off + 1; mode += inc )
      {
        if( satdChecked[mode] || mode < 0 || mode >= NUM_LUMA_MODE )
        {
          continue;
        }

        cu.intraDir[0] = mode;

        initPredIntraParams( cu, cu.Y(), sps );
        distParam.cur.buf = piPred.buf = m_SortedPelUnitBufs->getTestBuf().Y().buf;
        predIntraAng( COMP_Y, piPred, cu );

        // Use the min between SAD and HAD as the cost criterion
        // SAD is scaled by 2 to align with the scaling of HAD
        Distortion minSadHad = distParam.distFunc( distParam );

        uint64_t fracModeBits = xFracModeBitsIntraLuma( cu, mpmLst );

        //restore ctx
        m_CABACEstimator->getCtx() = SubCtx( CtxSet( Ctx::IntraLumaMpmFlag(), intra_ctx_size ), ctxStartIntraCtx );

        double cost = ( double ) minSadHad + ( double ) fracModeBits * sqrtLambdaForFirstPass;
        DTRACE( g_trace_ctx, D_INTRA_COST, "IntraHAD: %u, %llu, %f (%d)\n", minSadHad, fracModeBits, cost, mode );

        int insertPos = -1;
        updateCandList( ModeInfo( false, false, 0, NOT_INTRA_SUBPARTITIONS, mode ), cost, RdModeList, CandCostList, numModesForFullRD, &insertPos );
        updateCandList( ModeInfo( false, false, 0, NOT_INTRA_SUBPARTITIONS, mode ), ( double ) minSadHad, HadModeList, CandHadList, numHadCand );
        m_SortedPelUnitBufs->insert( insertPos, ( int ) RdModeList.size() );

        satdChecked[mode] = true;
      }
    }

    m_parentCandList.resize( RdModeList.size() );
    std::copy( RdModeList.cbegin(), RdModeList.cend(), m_parentCandList.begin() );
  }

  const bool isFirstLineOfCtu = (((cu.block(COMP_Y).y)&((cu.cs->sps)->CTUSize - 1)) == 0);
  if( m_pcEncCfg->m_MRL && ! isFirstLineOfCtu )
  {
    cu.multiRefIdx = 1;
    unsigned  multiRefMPM [NUM_MOST_PROBABLE_MODES];
    CU::getIntraMPMs(cu, multiRefMPM);

    for (int mRefNum = 1; mRefNum < MRL_NUM_REF_LINES; mRefNum++)
    {
      int multiRefIdx = MULTI_REF_LINE_IDX[mRefNum];

      cu.multiRefIdx = multiRefIdx;
      initIntraPatternChType(cu, cu.Y(), true);

      for (int x = 1; x < NUM_MOST_PROBABLE_MODES; x++)
      {
        cu.intraDir[0] = multiRefMPM[x];
        initPredIntraParams(cu, cu.Y(), sps);
        distParam.cur.buf = piPred.buf = m_SortedPelUnitBufs->getTestBuf().Y().buf;
        predIntraAng(COMP_Y, piPred, cu);

        // Use the min between SAD and SATD as the cost criterion
        // SAD is scaled by 2 to align with the scaling of HAD
        Distortion minSadHad = distParam.distFunc(distParam);

        // NB xFracModeBitsIntra will not affect the mode for chroma that may have already been pre-estimated.
        uint64_t fracModeBits = xFracModeBitsIntraLuma( cu, mpmLst );

        //restore ctx
        m_CABACEstimator->getCtx() = SubCtx(CtxSet(Ctx::IntraLumaMpmFlag(), intra_ctx_size), ctxStartIntraCtx);

        double cost = (double) minSadHad + (double) fracModeBits * sqrtLambdaForFirstPass;
//        DTRACE(g_trace_ctx, D_INTRA_COST, "IntraMRL: %u, %llu, %f (%d)\n", minSadHad, fracModeBits, cost, cu.intraDir[0]);

        int insertPos = -1;
        updateCandList( ModeInfo( false, false, multiRefIdx, NOT_INTRA_SUBPARTITIONS, cu.intraDir[0] ), cost, RdModeList,  CandCostList, numModesForFullRD, &insertPos );
        updateCandList( ModeInfo( false, false, multiRefIdx, NOT_INTRA_SUBPARTITIONS, cu.intraDir[0] ), (double)minSadHad, HadModeList, CandHadList,  numHadCand );
        m_SortedPelUnitBufs->insert(insertPos, (int)RdModeList.size());
      }
    }
    cu.multiRefIdx = 0;
  }

  if (testMip)
  {
    cu.mipFlag = true;
    cu.multiRefIdx = 0;

    double mipHadCost[MAX_NUM_MIP_MODE] = { MAX_DOUBLE };

    initIntraPatternChType(cu, cu.Y());
    initIntraMip( cu );

    const int transpOff    = getNumModesMip( cu.Y() );
    const int numModesFull = (transpOff << 1);
    for( uint32_t uiModeFull = 0; uiModeFull < numModesFull; uiModeFull++ )
    {
      const bool     isTransposed = (uiModeFull >= transpOff ? true : false);
      const uint32_t uiMode       = (isTransposed ? uiModeFull - transpOff : uiModeFull);

      cu.mipTransposedFlag = isTransposed;
      cu.intraDir[CH_L] = uiMode;
      distParam.cur.buf = piPred.buf = m_SortedPelUnitBufs->getTestBuf().Y().buf;
      predIntraMip(piPred, cu);

      // Use the min between SAD and HAD as the cost criterion
      // SAD is scaled by 2 to align with the scaling of HAD
      Distortion minSadHad = distParam.distFunc(distParam);

      uint64_t fracModeBits = xFracModeBitsIntraLuma( cu, mpmLst );

      //restore ctx
      m_CABACEstimator->getCtx() = SubCtx(CtxSet(Ctx::IntraLumaMpmFlag(), intra_ctx_size), ctxStartIntraCtx);

      double cost = double(minSadHad) + double(fracModeBits) * sqrtLambdaForFirstPass;
      mipHadCost[uiModeFull] = cost;
      DTRACE(g_trace_ctx, D_INTRA_COST, "IntraMIP: %u, %llu, %f (%d)\n", minSadHad, fracModeBits, cost, uiModeFull);

      int insertPos = -1;
      updateCandList( ModeInfo( true, isTransposed, 0, NOT_INTRA_SUBPARTITIONS, cu.intraDir[0] ), cost, RdModeList,  CandCostList, numModesForFullRD+1, &insertPos );
      updateCandList( ModeInfo( true, isTransposed, 0, NOT_INTRA_SUBPARTITIONS, cu.intraDir[0] ), 0.8*(double)minSadHad, HadModeList, CandHadList,  numHadCand );
      m_SortedPelUnitBufs->insert(insertPos, (int)RdModeList.size());
    }

    const double thresholdHadCost = 1.0 + 1.4 / sqrt((double)(cu.lwidth()*cu.lheight()));
    xReduceHadCandList(RdModeList, CandCostList, *m_SortedPelUnitBufs, numModesForFullRD, thresholdHadCost, mipHadCost, cu, fastMip);
  }

  if( m_pcEncCfg->m_bFastUDIUseMPMEnabled )
  {
    const int numMPMs = NUM_MOST_PROBABLE_MODES;
    unsigned  intraMpms[numMPMs];

    cu.multiRefIdx = 0;

    const int numCand = CU::getIntraMPMs( cu, intraMpms );
    ModeInfo mostProbableMode(false, false, 0, NOT_INTRA_SUBPARTITIONS, 0);

    for( int j = 0; j < numCand; j++ )
    {
      bool mostProbableModeIncluded = false;
      mostProbableMode.modeId = intraMpms[j];

      for( int i = 0; i < numModesForFullRD; i++ )
      {
        mostProbableModeIncluded |= ( mostProbableMode == RdModeList[i] );
      }
      if( !mostProbableModeIncluded )
      {
        numModesForFullRD++;
        RdModeList.push_back( mostProbableMode );
        CandCostList.push_back(0);
      }
    }
  }
}

bool IntraSearch::estIntraPredLumaQT(CodingUnit &cu, Partitioner &partitioner, double bestCost)
{
  CodingStructure       &cs           = *cu.cs;
  const int             width         = partitioner.currArea().lwidth();
  const int             height        = partitioner.currArea().lheight();

  //===== loop over partitions =====

  const TempCtx ctxStart           ( m_CtxCache, m_CABACEstimator->getCtx() );

  // variables for saving fast intra modes scan results across multiple LFNST passes
  double costInterCU = xFindInterCUCost( cu );

  bool validReturn = false;

  //===== determine set of modes to be tested (using prediction signal only) =====
  int numModesAvailable = NUM_LUMA_MODE; // total number of Intra modes
  static_vector<ModeInfo, FAST_UDI_MAX_RDMODE_NUM> RdModeList;
  static_vector<ModeInfo, FAST_UDI_MAX_RDMODE_NUM> HadModeList;
  static_vector<double, FAST_UDI_MAX_RDMODE_NUM> CandCostList;
  static_vector<double, FAST_UDI_MAX_RDMODE_NUM> CandHadList;

  int numModesForFullRD = g_aucIntraModeNumFast_UseMPM_2D[Log2(width) - MIN_CU_LOG2][Log2(height) - MIN_CU_LOG2];
  if (m_pcEncCfg->m_numIntraModesFullRD > 0)
    numModesForFullRD=m_pcEncCfg->m_numIntraModesFullRD;

#if INTRA_FULL_SEARCH
  numModesForFullRD = numModesAvailable;
#endif
  const SPS& sps = *cu.cs->sps;
  const bool mipAllowed = sps.MIP && cu.lwidth() <= sps.getMaxTbSize() && cu.lheight() <= sps.getMaxTbSize() && ((cu.lfnstIdx == 0) || allowLfnstWithMip(cu.lumaSize()));
  const int SizeThr     = 8 >> std::max( 0, m_pcEncCfg->m_useFastMIP - 1 );
  const bool testMip    = mipAllowed && ( cu.lwidth() <= ( SizeThr * cu.lheight() ) && cu.lheight() <= ( SizeThr * cu.lwidth() ) ) && ( cu.lwidth() <= MIP_MAX_WIDTH && cu.lheight() <= MIP_MAX_HEIGHT );
  bool testISP = sps.ISP && CU::canUseISP(width, height, cu.cs->sps->getMaxTbSize());
  if (testISP)
  {
    int numTotalPartsHor = (int)width >> floorLog2(CU::getISPSplitDim(width, height, TU_1D_VERT_SPLIT));
    int numTotalPartsVer = (int)height >> floorLog2(CU::getISPSplitDim(width, height, TU_1D_HORZ_SPLIT));
    m_ispTestedModes[0].init(numTotalPartsHor, numTotalPartsVer, 0);
    // the total number of subpartitions is modified to take into account the cases where LFNST cannot be combined with
    // ISP due to size restrictions
    numTotalPartsHor = sps.LFNST && CU::canUseLfnstWithISP(cu.Y(), HOR_INTRA_SUBPARTITIONS) ? numTotalPartsHor : 0;
    numTotalPartsVer = sps.LFNST && CU::canUseLfnstWithISP(cu.Y(), VER_INTRA_SUBPARTITIONS) ? numTotalPartsVer : 0;
    for (int j = 1; j < NUM_LFNST_NUM_PER_SET; j++)
    {
      m_ispTestedModes[j].init(numTotalPartsHor, numTotalPartsVer, 0);
    }
    testISP = m_ispTestedModes[0].numTotalParts[0];
  }
  else
  {
    m_ispTestedModes[0].init(0, 0, 0);
  }

  xEstimateLumaRdModeList(numModesForFullRD, RdModeList, HadModeList, CandCostList, CandHadList, cu, testMip);

  CHECK( (size_t)numModesForFullRD != RdModeList.size(), "Inconsistent state!" );

  // after this point, don't use numModesForFullRD
  if( m_pcEncCfg->m_usePbIntraFast && !cs.slice->isIntra() && RdModeList.size() < numModesAvailable )
  {
    double pbintraRatio = m_pcEncCfg->m_usePbIntraFast == 1 && ( cs.area.lwidth() >= 16 && cs.area.lheight() >= 16 ) ? 1.2 : PBINTRA_RATIO;

    int maxSize = -1;
    ModeInfo bestMipMode;
    int bestMipIdx = -1;
    for( int idx = 0; idx < RdModeList.size(); idx++ )
    {
      if( RdModeList[idx].mipFlg )
      {
        bestMipMode = RdModeList[idx];
        bestMipIdx = idx;
        break;
      }
    }
    const int numHadCand = 3;
    for (int k = numHadCand - 1; k >= 0; k--)
    {
      if (CandHadList.size() < (k + 1) || CandHadList[k] > cs.interHad * pbintraRatio) { maxSize = k; }
    }
    if (maxSize > 0)
    {
      RdModeList.resize(std::min<size_t>(RdModeList.size(), maxSize));
      if( bestMipIdx >= 0 )
      {
        if( RdModeList.size() <= bestMipIdx )
        {
          RdModeList.push_back(bestMipMode);
          m_SortedPelUnitBufs->swap( maxSize, bestMipIdx );
        }
      }
    }
    if (maxSize == 0)
    {
      cs.dist = MAX_DISTORTION;
      cs.interHad = 0;
      return false;
    }
  }

  //===== check modes (using r-d costs) =====
  ModeInfo bestPUMode;

  CodingStructure *csTemp = m_pTempCS;
  CodingStructure *csBest = m_pBestCS;

  csTemp->slice   = csBest->slice   = cs.slice;
  csTemp->picture = csBest->picture = cs.picture;
  csTemp->compactResize( cu );
  csBest->compactResize( cu );
  csTemp->initStructData();
  csBest->initStructData();

  int   bestLfnstIdx  = 0;
  const bool useBDPCM = cs.picture->useBDPCM;
  int   NumBDPCMCand  = (useBDPCM && sps.BDPCM && CU::bdpcmAllowed(cu, ComponentID(partitioner.chType))) ? 2 : 0;
  int   bestbdpcmMode = 0;
  int   bestISP       = 0;
  int   bestMrl       = 0;
  bool  bestMip       = 0;
  int   EndMode       = (int)RdModeList.size();
  bool  useISPlfnst   = testISP && sps.LFNST;
  bool  noLFNST_ts    = false;
  double bestCostIsp[2] = { MAX_DOUBLE, MAX_DOUBLE };
  bool disableMTS = false;
  bool disableLFNST = false;
  bool disableDCT2test = false;
  if (m_pcEncCfg->m_FastIntraTools)
  {
    int speedIntra = 0;
    xSpeedUpIntra(bestCost, EndMode, speedIntra, cu);
    disableMTS = (speedIntra >> 2 ) & 0x1;
    disableLFNST = (speedIntra >> 1) & 0x1;
    disableDCT2test = speedIntra>>3;
    if (disableLFNST)
    {
      noLFNST_ts = true;
      useISPlfnst = false;
    }
    if (speedIntra & 0x1)
    {
      testISP = false;
    }
  }

  for (int mode_cur = 0; mode_cur < EndMode + NumBDPCMCand; mode_cur++)
  {
    int mode = mode_cur;
    if (mode_cur >= EndMode)
    {
      mode = mode_cur - EndMode ? -1 : -2;
      testISP = false;
    }
    // set CU/PU to luma prediction mode
    ModeInfo testMode;
    int noISP = 0;
    int endISP = testISP ? 2 : 0;
    bool noLFNST = false || noLFNST_ts;
    if (mode && useISPlfnst)
    {
      noLFNST |= (bestCostIsp[0] > (bestCostIsp[1] * 1.4));
      if (mode > 2)
      {
        endISP = 0;
        testISP = false;
      }
    }
    if (testISP)
    {
      xSpeedUpISP(1, testISP, mode, noISP, endISP, cu, RdModeList, bestPUMode, bestISP, bestLfnstIdx);
    }
    int startISP = 0;
    if (disableDCT2test && mode && bestISP)
    {
      startISP = endISP ? 1 : 0;
    }
    for (int ispM = startISP; ispM <= endISP; ispM++)
    {
      if (ispM && (ispM == noISP))
      {
        continue;
      }

      if (mode < 0)
      {
        cu.bdpcmM[CH_L] = -mode;
        testMode = ModeInfo(false, false, 0, NOT_INTRA_SUBPARTITIONS, cu.bdpcmM[CH_L] == 2 ? VER_IDX : HOR_IDX);
      }
      else
      {
        testMode = RdModeList[mode];
        cu.bdpcmM[CH_L] = 0;
      }

      cu.ispMode = ispM;
      cu.mipFlag = testMode.mipFlg;
      cu.mipTransposedFlag = testMode.mipTrFlg;
      cu.multiRefIdx = testMode.mRefId;
      cu.intraDir[CH_L] = testMode.modeId;
      if (cu.ispMode && xSpeedUpISP(0, testISP, mode, noISP, endISP, cu, RdModeList, bestPUMode, bestISP, 0) )
      {
        continue;
      }
      if (m_pcEncCfg->m_FastIntraTools && (cu.ispMode || sps.LFNST || sps.MTS))
      {
        m_ispTestedModes[0].intraWasTested = true;
      }
      CHECK(cu.mipFlag && cu.multiRefIdx, "Error: combination of MIP and MRL not supported");
      CHECK(cu.multiRefIdx && (cu.intraDir[0] == PLANAR_IDX), "Error: combination of MRL and Planar mode not supported");
      CHECK(cu.ispMode && cu.mipFlag, "Error: combination of ISP and MIP not supported");
      CHECK(cu.ispMode && cu.multiRefIdx, "Error: combination of ISP and MRL not supported");

      // determine residual for partition
      cs.initSubStructure(*csTemp, partitioner.chType, cs.area, true);
      int doISP = (((cu.ispMode == 0) && noLFNST) || (useISPlfnst && mode && cu.ispMode && (bestLfnstIdx == 0)) || disableLFNST) ? -mode : mode;
      xIntraCodingLumaQT(*csTemp, partitioner, m_SortedPelUnitBufs->getBufFromSortedList(mode), bestCost, doISP, disableMTS);

      DTRACE(g_trace_ctx, D_INTRA_COST, "IntraCost T [x=%d,y=%d,w=%d,h=%d] %f (%d,%d,%d,%d,%d,%d) \n", cu.blocks[0].x,
        cu.blocks[0].y, width, height, csTemp->cost, testMode.modeId, testMode.ispMod,
        cu.multiRefIdx, cu.mipFlag, cu.lfnstIdx, cu.mtsFlag);

      if (cu.ispMode && !csTemp->cus[0]->firstTU->cbf[COMP_Y])
      {
        csTemp->cost = MAX_DOUBLE;
        csTemp->costDbOffset = 0;
      }
      if (useISPlfnst)
      {
        int n = (cu.ispMode == 0) ? 0 : 1;
        bestCostIsp[n] = csTemp->cost < bestCostIsp[n] ? csTemp->cost : bestCostIsp[n];
      }

      // check r-d cost
      if (csTemp->cost < csBest->cost)
      {
        validReturn   = true;
        std::swap(csTemp, csBest);
        bestPUMode    = testMode;
        bestLfnstIdx  = csBest->cus[0]->lfnstIdx;
        bestISP       = csBest->cus[0]->ispMode;
        bestMip       = csBest->cus[0]->mipFlag;
        bestMrl       = csBest->cus[0]->multiRefIdx;
        bestbdpcmMode = cu.bdpcmM[CH_L];
        m_ispTestedModes[bestLfnstIdx].bestSplitSoFar = ISPType(bestISP);
        if (csBest->cost < bestCost)
        {
          bestCost = csBest->cost;
        }
        if ((csBest->getTU(partitioner.chType)->mtsIdx[COMP_Y] == MTS_SKIP) && ( floorLog2(csBest->getTU(partitioner.chType)->blocks[COMP_Y].area()) >= 6 ))
        {
          noLFNST_ts = 1;
        }
      }

      // reset context models
      m_CABACEstimator->getCtx() = ctxStart;

      csTemp->releaseIntermediateData();

      if (m_pcEncCfg->m_fastLocalDualTreeMode && CU::isConsIntra(cu) && !cu.slice->isIntra() && csBest->cost != MAX_DOUBLE && costInterCU != COST_UNKNOWN && mode >= 0)
      {
        if( (m_pcEncCfg->m_fastLocalDualTreeMode == 2) || (csBest->cost > costInterCU * 1.5))
        {
          //Note: only try one intra mode, which is especially useful to reduce EncT for LDB case (around 4%)
          EndMode = 0;
          break;
        }
      }
    }
  } // Mode loop

  if (m_pcEncCfg->m_FastIntraTools && (sps.ISP|| sps.LFNST || sps.MTS))
  {
    int bestMode = csBest->getTU(partitioner.chType)->mtsIdx[COMP_Y] ? 4 : 0;
    bestMode |= bestLfnstIdx ? 2 : 0;
    bestMode |= bestISP ? 1 : 0;
    m_ispTestedModes[0].bestIntraMode = bestMode;
  }
  cu.ispMode = bestISP;
  if( validReturn )
  {
    cs.useSubStructure( *csBest, partitioner.chType, TREE_D, cu.singleChan( CH_L ), true );
    const ReshapeData& reshapeData = cs.picture->reshapeData;
    if (cs.picHeader->lmcsEnabled && reshapeData.getCTUFlag())
    {
      cs.getRspRecoBuf().copyFrom(csBest->getRspRecoBuf());
    }

    //=== update PU data ====
    cu.lfnstIdx           = bestLfnstIdx;
    cu.mipTransposedFlag  = bestPUMode.mipTrFlg;
    cu.intraDir[CH_L]     = bestPUMode.modeId;
    cu.bdpcmM[CH_L]       = bestbdpcmMode;
    cu.mipFlag            = bestMip;
    cu.multiRefIdx        = bestMrl;
  }
  else
  {
    THROW("fix this");
  }

  csBest->releaseIntermediateData();

  return validReturn;
}

void IntraSearch::estIntraPredChromaQT( CodingUnit& cu, Partitioner& partitioner, const double maxCostAllowed )
{
  PROFILER_SCOPE_AND_STAGE_EXT( 0, _TPROF, P_INTRA_CHROMA, cu.cs, CH_C );
  const TempCtx ctxStart( m_CtxCache, m_CABACEstimator->getCtx() );
  CodingStructure &cs   = *cu.cs;
  bool lumaUsesISP      = !CU::isSepTree(cu) && cu.ispMode;
  PartSplit ispType     = lumaUsesISP ? CU::getISPType(cu, COMP_Y) : TU_NO_ISP;
  double bestCostSoFar  = maxCostAllowed;
  const uint32_t numberValidComponents = getNumberValidComponents( cu.chromaFormat );
  const bool useBDPCM   = cs.picture->useBDPCM;

  uint32_t   uiBestMode = 0;
  Distortion uiBestDist = 0;
  double     dBestCost  = MAX_DOUBLE;

  //----- init mode list ----
  {
    uint32_t  uiMinMode = 0;
    uint32_t  uiMaxMode = NUM_CHROMA_MODE;

    const int reducedModeNumber = uiMaxMode >> (m_pcEncCfg->m_reduceIntraChromaModesFullRD ? 1 : 2);
    //----- check chroma modes -----
    uint32_t chromaCandModes[ NUM_CHROMA_MODE ];
    CU::getIntraChromaCandModes( cu, chromaCandModes );

    // create a temporary CS
    CodingStructure &saveCS = *m_pSaveCS[0];
    saveCS.pcv      = cs.pcv;
    saveCS.picture  = cs.picture;
    saveCS.area.repositionTo( cs.area );
    saveCS.clearTUs();

    if( !CU::isSepTree(cu) && cu.ispMode )
    {
      saveCS.clearCUs();
    }

    if( CU::isSepTree(cu) )
    {
      if( partitioner.canSplit( TU_MAX_TR_SPLIT, cs ) )
      {
        partitioner.splitCurrArea( TU_MAX_TR_SPLIT, cs );

        do
        {
          cs.addTU( CS::getArea( cs, partitioner.currArea(), partitioner.chType, partitioner.treeType ), partitioner.chType, &cu ).depth = partitioner.currTrDepth;
        } while( partitioner.nextPart( cs ) );

        partitioner.exitCurrSplit();
      }
      else
        cs.addTU( CS::getArea( cs, partitioner.currArea(), partitioner.chType, partitioner.treeType ), partitioner.chType, &cu );
    }

    // create a store for the TUs
    std::vector<TransformUnit*> orgTUs;
    for( const auto &ptu : cs.tus )
    {
      // for split TUs in HEVC, add the TUs without Chroma parts for correct setting of Cbfs
      if (lumaUsesISP || cu.contains(*ptu, CH_C))
      {
        saveCS.addTU( *ptu, partitioner.chType, nullptr );
        orgTUs.push_back( ptu );
      }
    }

    // SATD pre-selecting.
    int     satdModeList  [NUM_CHROMA_MODE] = { 0 };
    int64_t satdSortedCost[NUM_CHROMA_MODE] = { 0 };
    bool    modeDisable[NUM_INTRA_MODE + 1] = { false }; // use intra mode idx to check whether enable

    CodingStructure& cs = *(cu.cs);
    CompArea areaCb = cu.Cb();
    CompArea areaCr = cu.Cr();
    CPelBuf orgCb  = cs.getOrgBuf (COMP_Cb);
    PelBuf predCb  = cs.getPredBuf(COMP_Cb);
    CPelBuf orgCr  = cs.getOrgBuf (COMP_Cr);
    PelBuf predCr  = cs.getPredBuf(COMP_Cr);

    DistParam distParamSadCb  = m_pcRdCost->setDistParam( orgCb, predCb, cu.cs->sps->bitDepths[ CH_C ], DF_SAD);
    DistParam distParamSatdCb = m_pcRdCost->setDistParam( orgCb, predCb, cu.cs->sps->bitDepths[ CH_C ], DF_HAD);
    DistParam distParamSadCr  = m_pcRdCost->setDistParam( orgCr, predCr, cu.cs->sps->bitDepths[ CH_C ], DF_SAD);
    DistParam distParamSatdCr = m_pcRdCost->setDistParam( orgCr, predCr, cu.cs->sps->bitDepths[ CH_C ], DF_HAD);

    cu.intraDir[1] = MDLM_L_IDX; // temporary assigned, just to indicate this is a MDLM mode. for luma down-sampling operation.

    initIntraPatternChType(cu, cu.Cb());
    initIntraPatternChType(cu, cu.Cr());
    loadLMLumaRecPels(cu, cu.Cb());

    for (int idx = uiMinMode; idx < uiMaxMode; idx++)
    {
      int mode = chromaCandModes[idx];
      satdModeList[idx] = mode;
      if (CU::isLMCMode(mode) && ( !CU::isLMCModeEnabled(cu, mode) || cu.slice->lmChromaCheckDisable ) )
      {
        continue;
      }
      if ((mode == LM_CHROMA_IDX) || (mode == PLANAR_IDX) || (mode == DM_CHROMA_IDX)) // only pre-check regular modes and MDLM modes, not including DM ,Planar, and LM
      {
        continue;
      }

      cu.intraDir[1]    = mode; // temporary assigned, for SATD checking.

      const bool isLMCMode = CU::isLMCMode(mode);
      if( isLMCMode )
      {
        predIntraChromaLM(COMP_Cb, predCb, cu, areaCb, mode);
      }
      else
      {
        initPredIntraParams(cu, cu.Cb(), *cs.sps);
        predIntraAng(COMP_Cb, predCb, cu);
      }
      int64_t sadCb = distParamSadCb.distFunc(distParamSadCb) * 2;
      int64_t satdCb = distParamSatdCb.distFunc(distParamSatdCb);
      int64_t sad = std::min(sadCb, satdCb);

      if( isLMCMode )
      {
        predIntraChromaLM(COMP_Cr, predCr, cu, areaCr, mode);
      }
      else
      {
        initPredIntraParams(cu, cu.Cr(), *cs.sps);
        predIntraAng(COMP_Cr, predCr, cu);
      }
      int64_t sadCr = distParamSadCr.distFunc(distParamSadCr) * 2;
      int64_t satdCr = distParamSatdCr.distFunc(distParamSatdCr);
      sad += std::min(sadCr, satdCr);
      satdSortedCost[idx] = sad;
    }

    // sort the mode based on the cost from small to large.
    for (int i = uiMinMode; i <= uiMaxMode - 1; i++)
    {
      for (int j = i + 1; j <= uiMaxMode - 1; j++)
      {
        if (satdSortedCost[j] < satdSortedCost[i])
        {
          std::swap( satdModeList[i],   satdModeList[j]);
          std::swap( satdSortedCost[i], satdSortedCost[j]);
        }
      }
    }

    for (int i = 0; i < reducedModeNumber; i++)
    {
      modeDisable[satdModeList[uiMaxMode - 1 - i]] = true; // disable the last reducedModeNumber modes
    }

    int bestLfnstIdx = 0;
    // save the dist
    Distortion baseDist = cs.dist;
    int32_t bestbdpcmMode = 0;
    uint32_t numbdpcmModes = ( useBDPCM && CU::bdpcmAllowed(cu, COMP_Cb)
        && ((partitioner.chType == CH_C) || (cu.ispMode == 0 && cu.lfnstIdx == 0 && cu.firstTU->mtsIdx[COMP_Y] == MTS_SKIP))) ? 2 : 0;
    for (int mode_cur = uiMinMode; mode_cur < (int)(uiMaxMode + numbdpcmModes); mode_cur++)
    {
      int mode = mode_cur;
      if (mode_cur >= uiMaxMode)
      {
        mode = mode_cur > uiMaxMode ? -1 : -2; //set bdpcm mode
        if ((mode == -1) && (saveCS.tus[0]->mtsIdx[COMP_Cb] != MTS_SKIP) && (saveCS.tus[0]->mtsIdx[COMP_Cr] != MTS_SKIP))
        {
          continue;
        }
      }
      int chromaIntraMode;
      if (mode < 0)
      {
        cu.bdpcmM[CH_C] = -mode;
        chromaIntraMode = cu.bdpcmM[CH_C] == 2 ? chromaCandModes[1] : chromaCandModes[2];
      }
      else
      {
        cu.bdpcmM[CH_C] = 0;
        chromaIntraMode = chromaCandModes[mode];
        if (CU::isLMCMode(chromaIntraMode) && ( !CU::isLMCModeEnabled(cu, chromaIntraMode) || cu.slice->lmChromaCheckDisable ) )
        {
          continue;
        }
        if (modeDisable[chromaIntraMode] && CU::isLMCModeEnabled(cu, chromaIntraMode)) // when CCLM is disable, then MDLM is disable. not use satd checking
        {
          continue;
        }
      }
      cs.dist = baseDist;
      //----- restore context models -----
      m_CABACEstimator->getCtx() = ctxStart;

      //----- chroma coding -----
      cu.intraDir[1] = chromaIntraMode;
      m_ispTestedModes[0].IspType = ispType;
      m_ispTestedModes[0].subTuCounter = -1;
      xIntraChromaCodingQT( cs, partitioner );
      if (lumaUsesISP && cs.dist == MAX_UINT)
      {
        continue;
      }

      if (cs.sps->transformSkip)
      {
        m_CABACEstimator->getCtx() = ctxStart;
      }
      m_ispTestedModes[0].IspType = ispType;
      m_ispTestedModes[0].subTuCounter = -1;
      uint64_t fracBits   = xGetIntraFracBitsQT( cs, partitioner, false );
      Distortion uiDist = cs.dist;
      double    dCost   = m_pcRdCost->calcRdCost( fracBits, uiDist - baseDist );

      //----- compare -----
      if( dCost < dBestCost )
      {
        if (lumaUsesISP && (dCost < bestCostSoFar))
        {
          bestCostSoFar = dCost;
        }
        for( uint32_t i = getFirstComponentOfChannel( CH_C ); i < numberValidComponents; i++ )
        {
          const CompArea& area = cu.blocks[i];
          saveCS.getRecoBuf     ( area ).copyFrom( cs.getRecoBuf   ( area ) );
          cs.picture->getRecoBuf( area ).copyFrom( cs.getRecoBuf   ( area ) );
          for( uint32_t j = 0; j < saveCS.tus.size(); j++ )
          {
            saveCS.tus[j]->copyComponentFrom( *orgTUs[j], area.compID );
          }
        }
        dBestCost    = dCost;
        uiBestDist   = uiDist;
        uiBestMode   = chromaIntraMode;
        bestLfnstIdx = cu.lfnstIdx;
        bestbdpcmMode = cu.bdpcmM[CH_C];

      }
    }
    cu.lfnstIdx = bestLfnstIdx;
    cu.bdpcmM[CH_C]= bestbdpcmMode;

    for( uint32_t i = getFirstComponentOfChannel( CH_C ); i < numberValidComponents; i++ )
    {
      const CompArea& area = cu.blocks[i];

      cs.getRecoBuf         ( area ).copyFrom( saveCS.getRecoBuf( area ) );
      cs.picture->getRecoBuf( area ).copyFrom( cs.getRecoBuf    ( area ) );

      for( uint32_t j = 0; j < saveCS.tus.size(); j++ )
      {
        orgTUs[ j ]->copyComponentFrom( *saveCS.tus[ j ], area.compID );
      }
    }
  }
  cu.intraDir[1] = uiBestMode;
  cs.dist        = uiBestDist;

  //----- restore context models -----
  m_CABACEstimator->getCtx() = ctxStart;
  if (lumaUsesISP && bestCostSoFar >= maxCostAllowed)
  {
    cu.ispMode = 0;
  }
}

void IntraSearch::saveCuAreaCostInSCIPU( Area area, double cost )
{
  if( m_numCuInSCIPU < NUM_INTER_CU_INFO_SAVE )
  {
    m_cuAreaInSCIPU[m_numCuInSCIPU] = area;
    m_cuCostInSCIPU[m_numCuInSCIPU] = cost;
    m_numCuInSCIPU++;
  }
}

void IntraSearch::initCuAreaCostInSCIPU()
{
  for( int i = 0; i < NUM_INTER_CU_INFO_SAVE; i++ )
  {
    m_cuAreaInSCIPU[i] = Area();
    m_cuCostInSCIPU[i] = 0;
  }
  m_numCuInSCIPU = 0;
}
// -------------------------------------------------------------------------------------------------------------------
// Intra search
// -------------------------------------------------------------------------------------------------------------------

void IntraSearch::xEncIntraHeader( CodingStructure &cs, Partitioner &partitioner, const bool luma )
{
  CodingUnit &cu = *cs.getCU( partitioner.chType, partitioner.treeType );

  if (luma)
  {
    bool isFirst = cu.ispMode ? m_ispTestedModes[0].subTuCounter == 0 : partitioner.currArea().lumaPos() == cs.area.lumaPos();

    // CU header
    if( isFirst )
    {
      if ((!cs.slice->isIntra() || cs.slice->sps->IBC || cs.slice->sps->PLT) && cu.Y().valid())
      {
        m_CABACEstimator->pred_mode   ( cu );
      }
      m_CABACEstimator->bdpcm_mode  ( cu, ComponentID(partitioner.chType) );
    }

    // luma prediction mode
    if (isFirst)
    {
      if ( !cu.Y().valid())
      {
        m_CABACEstimator->pred_mode( cu );
      }
      m_CABACEstimator->intra_luma_pred_mode( cu );
    }
  }
  else //  if (chroma)
  {
    bool isFirst = partitioner.currArea().Cb().valid() && partitioner.currArea().chromaPos() == cs.area.chromaPos();

    if( isFirst )
    {
      m_CABACEstimator->bdpcm_mode(cu, ComponentID(CH_C));
      m_CABACEstimator->intra_chroma_pred_mode(  cu );
    }
  }
}

void IntraSearch::xEncSubdivCbfQT( CodingStructure &cs, Partitioner &partitioner, const bool luma )
{
  const UnitArea& currArea = partitioner.currArea();
  int subTuCounter = m_ispTestedModes[0].subTuCounter;
  TransformUnit  &currTU   = *cs.getTU(currArea.blocks[partitioner.chType], partitioner.chType, subTuCounter);
  CodingUnit     &currCU   = *currTU.cu;
  const uint32_t currDepth = partitioner.currTrDepth;
  const bool  subdiv = currTU.depth > currDepth;
  ComponentID compID = partitioner.chType == CH_L ? COMP_Y : COMP_Cb;

  if (!luma)
  {
    const bool chromaCbfISP = currArea.blocks[COMP_Cb].valid() && currCU.ispMode && !subdiv;
    if (!currCU.ispMode || chromaCbfISP)
    {
      const uint32_t numberValidComponents = getNumberValidComponents(currArea.chromaFormat);
      const uint32_t cbfDepth = (chromaCbfISP ? currDepth - 1 : currDepth);

      for (uint32_t ch = COMP_Cb; ch < numberValidComponents; ch++)
      {
        const ComponentID compID = ComponentID(ch);
        if (currDepth == 0 || TU::getCbfAtDepth(currTU, compID, currDepth - 1) || chromaCbfISP)
        {
          const bool prevCbf = (compID == COMP_Cr ? TU::getCbfAtDepth(currTU, COMP_Cb, currDepth) : false);
          m_CABACEstimator->cbf_comp(currCU, TU::getCbfAtDepth(currTU, compID, currDepth), currArea.blocks[compID], cbfDepth, prevCbf);
        }
      }
    }
  }

  if (subdiv)
  {
    if (partitioner.canSplit(TU_MAX_TR_SPLIT, cs))
    {
      partitioner.splitCurrArea(TU_MAX_TR_SPLIT, cs);
    }
    else if (currCU.ispMode && isLuma(compID))
    {
      partitioner.splitCurrArea(m_ispTestedModes[0].IspType, cs);
    }
    else
      THROW("Cannot perform an implicit split!");

    do
    {
      xEncSubdivCbfQT(cs, partitioner, luma);   //?
      subTuCounter += subTuCounter != -1 ? 1 : 0;
    } while (partitioner.nextPart(cs));

    partitioner.exitCurrSplit();
  }
  else
  {
    //===== Cbfs =====
    if (luma)
    {
      bool previousCbf = false;
      bool lastCbfIsInferred = false;
      if (m_ispTestedModes[0].IspType != TU_NO_ISP)
      {
        bool     rootCbfSoFar = false;
        uint32_t nTus = currCU.ispMode == HOR_INTRA_SUBPARTITIONS ? currCU.lheight() >> floorLog2(currTU.lheight())
          : currCU.lwidth() >> floorLog2(currTU.lwidth());
        if (subTuCounter == nTus - 1)
        {
          TransformUnit* tuPointer = currCU.firstTU;
          for (int tuIdx = 0; tuIdx < nTus - 1; tuIdx++)
          {
            rootCbfSoFar |= TU::getCbfAtDepth(*tuPointer, COMP_Y, currDepth);
            tuPointer = tuPointer->next;
          }
          if (!rootCbfSoFar)
          {
            lastCbfIsInferred = true;
          }
        }
        if (!lastCbfIsInferred)
        {
          previousCbf = TU::getPrevTuCbfAtDepth(currTU, COMP_Y, partitioner.currTrDepth);
        }
      }
      if (!lastCbfIsInferred)
      {
        m_CABACEstimator->cbf_comp(currCU, TU::getCbfAtDepth(currTU, COMP_Y, currDepth), currTU.Y(), currTU.depth, previousCbf, currCU.ispMode);
      }
    }
  }
}
void IntraSearch::xEncCoeffQT(CodingStructure& cs, Partitioner& partitioner, const ComponentID compID, CUCtx* cuCtx, const int subTuIdx, const PartSplit ispType)
{
  const UnitArea& currArea  = partitioner.currArea();

  int subTuCounter          = m_ispTestedModes[0].subTuCounter;
  TransformUnit& currTU     = *cs.getTU(currArea.blocks[partitioner.chType], partitioner.chType, subTuCounter);
  uint32_t   currDepth      = partitioner.currTrDepth;
  const bool subdiv         = currTU.depth > currDepth;

  if (subdiv)
  {
    if (partitioner.canSplit(TU_MAX_TR_SPLIT, cs))
    {
      partitioner.splitCurrArea(TU_MAX_TR_SPLIT, cs);
    }
    else if (currTU.cu->ispMode)
    {
      partitioner.splitCurrArea(m_ispTestedModes[0].IspType, cs);
    }
    else
      THROW("Implicit TU split not available!");

    do
    {
      xEncCoeffQT(cs, partitioner, compID, cuCtx, subTuCounter, m_ispTestedModes[0].IspType);
      subTuCounter += subTuCounter != -1 ? 1 : 0;
    } while( partitioner.nextPart( cs ) );

    partitioner.exitCurrSplit();
  }
  else

  if( currArea.blocks[compID].valid() )
  {
    if( compID == COMP_Cr )
    {
      const int cbfMask = ( TU::getCbf( currTU, COMP_Cb ) ? 2 : 0 ) + ( TU::getCbf( currTU, COMP_Cr ) ? 1 : 0 );
      m_CABACEstimator->joint_cb_cr( currTU, cbfMask );
    }
    if( TU::getCbf( currTU, compID ) )
    {
      if( isLuma(compID) )
      {
        m_CABACEstimator->residual_coding( currTU, compID, cuCtx );
        m_CABACEstimator->mts_idx( *currTU.cu, cuCtx );
      }
      else
        m_CABACEstimator->residual_coding( currTU, compID );
    }
  }
}

uint64_t IntraSearch::xGetIntraFracBitsQT( CodingStructure &cs, Partitioner &partitioner, const bool luma, CUCtx *cuCtx )
{
  m_CABACEstimator->resetBits();

  xEncIntraHeader( cs, partitioner, luma );
  xEncSubdivCbfQT( cs, partitioner, luma );

  if( luma )
  {
    xEncCoeffQT( cs, partitioner, COMP_Y, cuCtx );

    CodingUnit &cu = *cs.cus[0];
    if (cuCtx /*&& CU::isSepTree(cu)*/
      && (!cu.ispMode || (cu.lfnstIdx && m_ispTestedModes[0].subTuCounter == 0)
        || (!cu.lfnstIdx
          && m_ispTestedModes[0].subTuCounter == m_ispTestedModes[cu.lfnstIdx].numTotalParts[cu.ispMode - 1] - 1)))
    {
      m_CABACEstimator->residual_lfnst_mode( cu, *cuCtx );
    }
  }
  else
  {
    xEncCoeffQT( cs, partitioner, COMP_Cb );
    xEncCoeffQT( cs, partitioner, COMP_Cr );
  }

  uint64_t fracBits = m_CABACEstimator->getEstFracBits();
  return fracBits;
}

uint64_t IntraSearch::xGetIntraFracBitsQTChroma(const TransformUnit& currTU, const ComponentID compID, CUCtx *cuCtx)
{
  m_CABACEstimator->resetBits();

  if ( currTU.jointCbCr )
  {
    const int cbfMask = ( TU::getCbf( currTU, COMP_Cb ) ? 2 : 0 ) + ( TU::getCbf( currTU, COMP_Cr ) ? 1 : 0 );
    m_CABACEstimator->cbf_comp( *currTU.cu, cbfMask>>1, currTU.blocks[ COMP_Cb ], currTU.depth, false );
    m_CABACEstimator->cbf_comp( *currTU.cu, cbfMask &1, currTU.blocks[ COMP_Cr ], currTU.depth, cbfMask>>1 );
    if( cbfMask )
      m_CABACEstimator->joint_cb_cr( currTU, cbfMask );
    if (cbfMask >> 1)
      m_CABACEstimator->residual_coding( currTU, COMP_Cb, cuCtx );
    if (cbfMask & 1)
      m_CABACEstimator->residual_coding( currTU, COMP_Cr, cuCtx );
  }
  else
  {
    if ( compID == COMP_Cb )
      m_CABACEstimator->cbf_comp( *currTU.cu, TU::getCbf( currTU, compID ), currTU.blocks[ compID ], currTU.depth, false );
    else
    {
      const bool cbCbf    = TU::getCbf( currTU, COMP_Cb );
      const bool crCbf    = TU::getCbf( currTU, compID );
      const int  cbfMask  = ( cbCbf ? 2 : 0 ) + ( crCbf ? 1 : 0 );
      m_CABACEstimator->cbf_comp( *currTU.cu, crCbf, currTU.blocks[ compID ], currTU.depth, cbCbf );
      m_CABACEstimator->joint_cb_cr( currTU, cbfMask );
    }
  }

  if( !currTU.jointCbCr && TU::getCbf( currTU, compID ) )
  {
    m_CABACEstimator->residual_coding( currTU, compID, cuCtx );
  }

  uint64_t fracBits = m_CABACEstimator->getEstFracBits();
  return fracBits;
}

void IntraSearch::xIntraCodingTUBlock(TransformUnit &tu, const ComponentID compID, const bool checkCrossCPrediction, Distortion &ruiDist, uint32_t *numSig, PelUnitBuf *predBuf, const bool loadTr)
{
  if (!tu.blocks[compID].valid())
  {
    return;
  }

  CodingStructure &cs             = *tu.cs;
  const CompArea      &area       = tu.blocks[compID];
  const SPS           &sps        = *cs.sps;
  const ReshapeData&  reshapeData = cs.picture->reshapeData;

  const ChannelType    chType     = toChannelType(compID);
  const int            bitDepth   = sps.bitDepths[chType];

  CPelBuf        piOrg            = cs.getOrgBuf    (area);
  PelBuf         piPred           = cs.getPredBuf   (area);
  PelBuf         piResi           = cs.getResiBuf   (area);
  PelBuf         piReco           = cs.getRecoBuf   (area);

  const CodingUnit& cu            = *tu.cu;

  //===== init availability pattern =====
  CHECK( tu.jointCbCr && compID == COMP_Cr, "wrong combination of compID and jointCbCr" );
  bool jointCbCr = tu.jointCbCr && compID == COMP_Cb;

  if ( isLuma(compID) )
  {
    bool predRegDiffFromTB = CU::isPredRegDiffFromTB(*tu.cu );
    bool firstTBInPredReg  = false;
    CompArea areaPredReg(COMP_Y, tu.chromaFormat, area);
    if (tu.cu->ispMode )
    {
      firstTBInPredReg = CU::isFirstTBInPredReg(*tu.cu, area);
      if (predRegDiffFromTB)
      {
        if (firstTBInPredReg)
        {
          CU::adjustPredArea(areaPredReg);
          initIntraPatternChTypeISP(*tu.cu, areaPredReg, piReco);
        }
      }
      else
        initIntraPatternChTypeISP(*tu.cu, area, piReco);
    }
    else if( !predBuf )
    {
      initIntraPatternChType(*tu.cu, area);
    }

    //===== get prediction signal =====
    if (predRegDiffFromTB)
    {
      if (firstTBInPredReg)
      {
        PelBuf piPredReg = cs.getPredBuf(areaPredReg);
        predIntraAng(compID, piPredReg, cu);
      }
    }
    else
    {
      if( predBuf )
      {
        piPred.copyFrom( predBuf->Y() );
      }
      else if( CU::isMIP( cu, CH_L ) )
      {
        initIntraMip( cu );
        predIntraMip( piPred, cu );
      }
      else
      {
        predIntraAng(compID, piPred, cu);
      }
    }
  }
  DTRACE( g_trace_ctx, D_PRED, "@(%4d,%4d) [%2dx%2d] IMode=%d\n", tu.lx(), tu.ly(), tu.lwidth(), tu.lheight(), CU::getFinalIntraMode(cu, chType) );
  const Slice &slice = *cs.slice;
  bool flag = cs.picHeader->lmcsEnabled && (slice.isIntra() || (!slice.isIntra() && reshapeData.getCTUFlag()));

  if (isLuma(compID))
  {
    //===== get residual signal =====
    if (cs.picHeader->lmcsEnabled && reshapeData.getCTUFlag() )
    {
      piResi.subtract(cs.getRspOrgBuf(area), piPred);
    }
    else
    {
      piResi.subtract( piOrg, piPred );
    }
  }

  //===== transform and quantization =====
  //--- init rate estimation arrays for RDOQ ---
  //--- transform and quantization           ---
  TCoeff uiAbsSum = 0;
  const QpParam cQP(tu, compID);

  m_pcTrQuant->selectLambda(compID);

  flag =flag && (tu.blocks[compID].width*tu.blocks[compID].height > 4);
  if (flag && isChroma(compID) && cs.picHeader->lmcsChromaResidualScale )
  {
    int cResScaleInv = tu.chromaAdj;
    double cRescale = (double)(1 << CSCALE_FP_PREC) / (double)cResScaleInv;
    m_pcTrQuant->scaleLambda( 1.0/(cRescale*cRescale) );
  }

  if ( jointCbCr )
  {
    // Lambda is loosened for the joint mode with respect to single modes as the same residual is used for both chroma blocks
    const int    absIct = abs( TU::getICTMode(tu) );
    const double lfact  = ( absIct == 1 || absIct == 3 ? 0.8 : 0.5 );
    m_pcTrQuant->scaleLambda( lfact );
  }
  if ( sps.jointCbCr && isChroma(compID) && (tu.cu->cs->slice->sliceQp > 18) )
  {
    m_pcTrQuant->scaleLambda( 1.3 );
  }

  if( isLuma(compID) )
  {
    m_pcTrQuant->transformNxN(tu, compID, cQP, uiAbsSum, m_CABACEstimator->getCtx(), loadTr);

    DTRACE( g_trace_ctx, D_TU_ABS_SUM, "%d: comp=%d, abssum=%d\n", DTRACE_GET_COUNTER( g_trace_ctx, D_TU_ABS_SUM ), compID, uiAbsSum );
    if (tu.cu->ispMode && isLuma(compID) && CU::isISPLast(*tu.cu, area, area.compID) && CU::allLumaCBFsAreZero(*tu.cu))
    {
      // ISP has to have at least one non-zero CBF
      ruiDist = MAX_INT;
      return;
    }
    //--- inverse transform ---
    if (uiAbsSum > 0)
    {
      m_pcTrQuant->invTransformNxN(tu, compID, piResi, cQP);
    }
    else
    {
      piResi.fill(0);
    }
  }
  else // chroma
  {
    PelBuf          crPred = cs.getPredBuf ( COMP_Cr );
    PelBuf          crResi = cs.getResiBuf ( COMP_Cr );
    PelBuf          crReco = cs.getRecoBuf ( COMP_Cr );

    int         codedCbfMask  = 0;
    ComponentID codeCompId    = (tu.jointCbCr ? (tu.jointCbCr >> 1 ? COMP_Cb : COMP_Cr) : compID);
    const QpParam qpCbCr(tu, codeCompId);

    if( tu.jointCbCr )
    {
      ComponentID otherCompId = ( codeCompId==COMP_Cr ? COMP_Cb : COMP_Cr );
      tu.getCoeffs( otherCompId ).fill(0); // do we need that?
      TU::setCbfAtDepth (tu, otherCompId, tu.depth, false );
    }
    PelBuf& codeResi = ( codeCompId == COMP_Cr ? crResi : piResi );
    uiAbsSum = 0;
    m_pcTrQuant->transformNxN(tu, codeCompId, qpCbCr, uiAbsSum, m_CABACEstimator->getCtx(), loadTr);
    DTRACE( g_trace_ctx, D_TU_ABS_SUM, "%d: comp=%d, abssum=%d\n", DTRACE_GET_COUNTER( g_trace_ctx, D_TU_ABS_SUM ), codeCompId, uiAbsSum );
    if( uiAbsSum > 0 )
    {
      m_pcTrQuant->invTransformNxN(tu, codeCompId, codeResi, qpCbCr);
      codedCbfMask += ( codeCompId == COMP_Cb ? 2 : 1 );
    }
    else
    {
      codeResi.fill(0);
    }

    if( tu.jointCbCr )
    {
      if( tu.jointCbCr == 3 && codedCbfMask == 2 )
      {
        codedCbfMask = 3;
        TU::setCbfAtDepth (tu, COMP_Cr, tu.depth, true );
      }
      if( tu.jointCbCr != codedCbfMask )
      {
        ruiDist = MAX_DISTORTION;
        return;
      }
      m_pcTrQuant->invTransformICT( tu, piResi, crResi );
      uiAbsSum = codedCbfMask;
    }

    //===== reconstruction =====
    if ( flag && uiAbsSum > 0 && cs.picHeader->lmcsChromaResidualScale )
    {
      piResi.scaleSignal(tu.chromaAdj, 0, slice.clpRngs[compID]);

      if( jointCbCr )
      {
        crResi.scaleSignal(tu.chromaAdj, 0, slice.clpRngs[COMP_Cr]);
      }
    }

    if( jointCbCr )
    {
      crReco.reconstruct(crPred, crResi, cs.slice->clpRngs[ COMP_Cr ]);
    }
  }
  piReco.reconstruct(piPred, piResi, cs.slice->clpRngs[ compID ]);
  


  //===== update distortion =====
  const bool reshapeIntraCMD = m_pcEncCfg->m_reshapeSignalType == RESHAPE_SIGNAL_PQ;
  if(((cs.picHeader->lmcsEnabled && (reshapeData.getCTUFlag() || (isChroma(compID) && reshapeIntraCMD))) || m_pcEncCfg->m_lumaLevelToDeltaQPEnabled ) )
  {
    const CPelBuf orgLuma = cs.getOrgBuf( cs.area.blocks[COMP_Y] );
    if( compID == COMP_Y && !m_pcEncCfg->m_lumaLevelToDeltaQPEnabled )
    {
      PelBuf tmpRecLuma = cs.getRspRecoBuf(area);
      tmpRecLuma.rspSignal( piReco, reshapeData.getInvLUT());
      ruiDist += m_pcRdCost->getDistPart(piOrg, tmpRecLuma, sps.bitDepths[toChannelType(compID)], compID, DF_SSE_WTD, &orgLuma);
    }
    else
    {
      ruiDist += m_pcRdCost->getDistPart( piOrg, piReco, bitDepth, compID, DF_SSE_WTD, &orgLuma );
      if( jointCbCr )
      {
        CPelBuf         crOrg  = cs.getOrgBuf  ( COMP_Cr );
        PelBuf          crReco = cs.getRecoBuf ( COMP_Cr );
        ruiDist += m_pcRdCost->getDistPart( crOrg, crReco, bitDepth, COMP_Cr, DF_SSE_WTD, &orgLuma );
      }
    }
  }
  else
  {
    ruiDist += m_pcRdCost->getDistPart( piOrg, piReco, bitDepth, compID, DF_SSE );
    if( jointCbCr )
    {
      CPelBuf         crOrg  = cs.getOrgBuf  ( COMP_Cr );
      PelBuf          crReco = cs.getRecoBuf ( COMP_Cr );
      ruiDist += m_pcRdCost->getDistPart( crOrg, crReco, bitDepth, COMP_Cr, DF_SSE );
    }
  }
}

void IntraSearch::xIntraCodingLumaQT(CodingStructure& cs, Partitioner& partitioner, PelUnitBuf* predBuf, const double bestCostSoFar, int numMode, bool disableMTS)
{
  PROFILER_SCOPE_AND_STAGE_EXT( 0, _TPROF, P_INTRA_RD_SEARCH_LUMA, &cs, partitioner.chType );
  const UnitArea& currArea  = partitioner.currArea();
  uint32_t        currDepth = partitioner.currTrDepth;
  Distortion singleDistLuma = 0;
  uint32_t   numSig         = 0;
  const SPS &sps            = *cs.sps;
  CodingUnit &cu            = *cs.cus[0];
  bool mtsAllowed = (numMode < 0) || disableMTS ? false : CU::isMTSAllowed(cu, COMP_Y);
  uint64_t singleFracBits   = 0;
  bool   splitCbfLumaSum    = false;
  double bestCostForISP     = bestCostSoFar;
  double dSingleCost        = MAX_DOUBLE;
  int endLfnstIdx           = (partitioner.isSepTree(cs) && partitioner.chType == CH_C && (currArea.lwidth() < 8 || currArea.lheight() < 8))
                           || (currArea.lwidth() > sps.getMaxTbSize() || currArea.lheight() > sps.getMaxTbSize()) || !sps.LFNST || (numMode < 0) ? 0 : 2;
  const bool useTS          = cs.picture->useTS;
  numMode                   = (numMode < 0) ? -numMode : numMode;

  if (cu.mipFlag && !allowLfnstWithMip(cu.lumaSize()))
  {
    endLfnstIdx = 0;
  }
  int bestMTS = 0;
  int EndMTS  = mtsAllowed ? m_pcEncCfg->m_MTSIntraMaxCand : 0;
  if (cu.ispMode && (EndMTS || endLfnstIdx))
  {
    EndMTS = 0;
    if ((m_ispTestedModes[1].numTotalParts[cu.ispMode - 1] == 0)
     && (m_ispTestedModes[2].numTotalParts[cu.ispMode - 1] == 0))
    {
      endLfnstIdx = 0;
    }
  }
  if (cu.bdpcmM[CH_L])
  {
    endLfnstIdx = 0;
    EndMTS = 0;
  }
  bool checkTransformSkip = sps.transformSkip;

  SizeType transformSkipMaxSize = 1 << sps.log2MaxTransformSkipBlockSize;
  bool tsAllowed = useTS  && cu.cs->sps->transformSkip && (!cu.ispMode) && (!cu.bdpcmM[CH_L]) && (!cu.sbtInfo);
  tsAllowed &= cu.blocks[COMP_Y].width <= transformSkipMaxSize && cu.blocks[COMP_Y].height <= transformSkipMaxSize;
  if (tsAllowed)
  {
    EndMTS += 1;
  }
  if (endLfnstIdx || EndMTS)
  {
    bool       splitCbfLuma  = false;
    const PartSplit ispType  = CU::getISPType(cu, COMP_Y);
    CUCtx cuCtx;
    cuCtx.isDQPCoded         = true;
    cuCtx.isChromaQpAdjCoded = true;
    cs.cost                  = 0.0;
    Distortion       singleDistTmpLuma = 0;
    uint64_t         singleTmpFracBits = 0;
    double           singleCostTmp     = 0;
    const TempCtx    ctxStart          (m_CtxCache, m_CABACEstimator->getCtx());
          TempCtx    ctxBest           (m_CtxCache);
    CodingStructure &saveCS            = *m_pSaveCS[cu.ispMode?0:1];
    TransformUnit *  tmpTU             = nullptr;
    int              bestLfnstIdx      = 0;
    int              startLfnstIdx     = 0;
    // speedUps LFNST
    bool   rapidLFNST                  = false;
    bool   rapidDCT                    = false;
    double thresholdDCT                = 1;

    if (m_pcEncCfg->m_MTS == 2)
    {
      thresholdDCT += 1.4 / sqrt(cu.lwidth() * cu.lheight());
    }

    if (m_pcEncCfg->m_LFNST > 1)
    {
      rapidLFNST = true;

      if (m_pcEncCfg->m_LFNST > 2)
      {
        rapidDCT    = true;
        endLfnstIdx = endLfnstIdx ? 1 : 0;
      }
    }

    saveCS.pcv              = cs.pcv;
    saveCS.picture          = cs.picture;
    saveCS.area.repositionTo( cs.area);

    if (cu.ispMode)
    {
      partitioner.splitCurrArea(ispType, cs);
    }

    TransformUnit& tu = cs.addTU(CS::getArea(cs, partitioner.currArea(), partitioner.chType, partitioner.treeType), partitioner.chType, cs.cus[0]);

    if (cu.ispMode)
    {
      saveCS.clearTUs();
      do
      {
        saveCS.addTU(
          CS::getArea(cs, partitioner.currArea(), partitioner.chType, partitioner.treeType),
          partitioner.chType, cs.cus[0]);
      } while (partitioner.nextPart(cs));

      partitioner.exitCurrSplit();
    }
    else
    {
      tmpTU = saveCS.tus.empty() ? &saveCS.addTU( currArea, partitioner.chType, nullptr ) : saveCS.tus.front();
      tmpTU->initData();
      tmpTU->UnitArea::operator=( currArea );
    }


    std::vector<TrMode> trModes{ TrMode(0, true) };
    if (tsAllowed)
    {
      trModes.push_back(TrMode(1, true));
    }
    double dct2Cost           = MAX_DOUBLE;
    double trGrpStopThreshold = 1.001;
    double trGrpBestCost      = MAX_DOUBLE;

    if (mtsAllowed)
    {
      if (m_pcEncCfg->m_LFNST)
      {
        uint32_t uiIntraMode = cs.cus[0]->intraDir[partitioner.chType];
        int MTScur           = (uiIntraMode < 34) ? MTS_DST7_DCT8 : MTS_DCT8_DST7;

        trModes.push_back(TrMode(     2, true));
        trModes.push_back(TrMode(MTScur, true));

        MTScur = (uiIntraMode < 34) ? MTS_DCT8_DST7 : MTS_DST7_DCT8;

        trModes.push_back(TrMode(MTScur,            true));
        trModes.push_back(TrMode(MTS_DST7_DST7 + 3, true));
      }
      else
      {
        for (int i = 2; i < 6; i++)
        {
          trModes.push_back(TrMode(i, true));
        }
      }
    }

    if ((EndMTS && !m_pcEncCfg->m_LFNST) || (tsAllowed && !mtsAllowed))
    {
      xPreCheckMTS(tu, &trModes, m_pcEncCfg->m_MTSIntraMaxCand, predBuf);
      if (!mtsAllowed && !trModes[1].second)
      {
        EndMTS = 0;
      }
    }

    bool NStopMTS = true;

    for (int modeId = 0; modeId <= EndMTS && NStopMTS; modeId++)
    {
      if (modeId > 1)
      {
        trGrpBestCost = MAX_DOUBLE;
      }
      for (int lfnstIdx = startLfnstIdx; lfnstIdx <= endLfnstIdx; lfnstIdx++)
      {
        if (lfnstIdx && modeId)
        {
          continue;
        }
        if (mtsAllowed || tsAllowed)
        {
          if (m_pcEncCfg->m_TS && bestMTS == MTS_SKIP)
          {
            break;
          }
          if (!m_pcEncCfg->m_LFNST && !trModes[modeId].second && mtsAllowed)
          {
            continue;
          }

          tu.mtsIdx[COMP_Y] = trModes[modeId].first;
        }

        if (cu.ispMode && lfnstIdx)
        {
          if (m_ispTestedModes[lfnstIdx].numTotalParts[cu.ispMode - 1] == 0)
          {
            if (lfnstIdx == 2)
            {
              endLfnstIdx = 1;
            }
            continue;
          }
        }

        cu.lfnstIdx                          = lfnstIdx;
        cuCtx.lfnstLastScanPos               = false;
        cuCtx.violatesLfnstConstrained[CH_L] = false;
        cuCtx.violatesLfnstConstrained[CH_C] = false;

        if ((lfnstIdx != startLfnstIdx) || (modeId))
        {
          m_CABACEstimator->getCtx() = ctxStart;
        }

        singleDistTmpLuma = 0;

        if (cu.ispMode)
        {
          splitCbfLuma = false;

          partitioner.splitCurrArea(ispType, cs);

          singleCostTmp = xTestISP(cs, partitioner, bestCostForISP, ispType, splitCbfLuma, singleTmpFracBits, singleDistTmpLuma, cuCtx);

          partitioner.exitCurrSplit();

          if (modeId && (singleCostTmp == MAX_DOUBLE))
          {
            m_ispTestedModes[lfnstIdx].numTotalParts[cu.ispMode - 1] = 0;
          }

          bool storeCost = (numMode == 1) ? true : false;

          if ((m_pcEncCfg->m_ISP >= 2) && (numMode <= 1))
          {
            storeCost = true;
          }

          if (storeCost)
          {
            m_ispTestedModes[0].bestCost[cu.ispMode - 1] = singleCostTmp;
          }
        }
        else
        {
          bool TrLoad = (EndMTS && !m_pcEncCfg->m_LFNST) || (tsAllowed && !mtsAllowed && (lfnstIdx == 0)) ? true : false;

          xIntraCodingTUBlock(tu, COMP_Y, false, singleDistTmpLuma, &numSig, predBuf, TrLoad);

          cuCtx.mtsLastScanPos = false;
          //----- determine rate and r-d cost -----
        if ((sps.LFNST ? (modeId == EndMTS && modeId != 0 && checkTransformSkip) : (trModes[modeId].first != 0)) && !TU::getCbfAtDepth(tu, COMP_Y, currDepth))
        {
          singleCostTmp = MAX_DOUBLE;
        }
        else
        {
          m_ispTestedModes[0].IspType      = TU_NO_ISP;
          m_ispTestedModes[0].subTuCounter = -1;
          singleTmpFracBits = xGetIntraFracBitsQT(cs, partitioner, true, &cuCtx);

          if (tu.mtsIdx[COMP_Y] > MTS_SKIP)
          {
            if (!cuCtx.mtsLastScanPos)
            {
              singleCostTmp = MAX_DOUBLE;
            }
            else
            {
              singleCostTmp = m_pcRdCost->calcRdCost(singleTmpFracBits, singleDistTmpLuma);
            }
          }
          else
          {
            singleCostTmp = m_pcRdCost->calcRdCost(singleTmpFracBits, singleDistTmpLuma);
          }
        }

          if (((EndMTS && (m_pcEncCfg->m_MTS == 2)) || rapidLFNST) && modeId == 0 && lfnstIdx == 0)
          {
            if (singleCostTmp > bestCostSoFar * thresholdDCT)
            {
              EndMTS = 0;

              if (rapidDCT)
              {
                endLfnstIdx = 0;   // break the loop but do not cpy best
              }
            }
          }

          if (lfnstIdx && !cuCtx.lfnstLastScanPos && !cu.ispMode)
          {
            bool rootCbfL = false;

            for (uint32_t t = 0; t < getNumberValidTBlocks(*cu.cs->pcv); t++)
            {
              rootCbfL |= tu.cbf[t] != 0;
            }

            if (rapidLFNST && !rootCbfL)
            {
              endLfnstIdx = lfnstIdx; // break the loop
            }
            bool cbfAtZeroDepth = CU::isSepTree(cu)
              ? rootCbfL
              : (cs.area.chromaFormat != CHROMA_400 && std::min(cu.firstTU->blocks[1].width, cu.firstTU->blocks[1].height) < 4)
                ? TU::getCbfAtDepth(tu, COMP_Y, currDepth)
                : rootCbfL;

            if (cbfAtZeroDepth)
            {
              singleCostTmp = MAX_DOUBLE;
            }
          }
        }

        if (singleCostTmp < dSingleCost)
        {
          trGrpBestCost  = singleCostTmp;
          dSingleCost    = singleCostTmp;
          singleDistLuma = singleDistTmpLuma;
          singleFracBits = singleTmpFracBits;
          bestLfnstIdx   = lfnstIdx;
          bestMTS        = modeId;

          if (dSingleCost < bestCostForISP)
          {
            bestCostForISP = dSingleCost;
          }

          splitCbfLumaSum = splitCbfLuma;

          if (lfnstIdx == 0 && modeId == 0 && cu.ispMode == 0)
          {
            dct2Cost = singleCostTmp;

            if (!TU::getCbfAtDepth(tu, COMP_Y, currDepth))
            {
              if (rapidLFNST)
              {
                 endLfnstIdx = 0;   // break the loop but do not cpy best
              }

              EndMTS = 0;
            }
          }

          if (bestLfnstIdx != endLfnstIdx || bestMTS != EndMTS)
          {
            if (cu.ispMode)
            {
              saveCS.getRecoBuf(currArea.Y()).copyFrom(cs.getRecoBuf(currArea.Y()));

              for (uint32_t j = 0; j < cs.tus.size(); j++)
              {
                saveCS.tus[j]->copyComponentFrom(*cs.tus[j], COMP_Y);
              }
            }
            else
            {
              saveCS.getPredBuf(tu.Y()).copyFrom(cs.getPredBuf(tu.Y()));
              saveCS.getRecoBuf(tu.Y()).copyFrom(cs.getRecoBuf(tu.Y()));

              tmpTU->copyComponentFrom(tu, COMP_Y);
            }

            ctxBest = m_CABACEstimator->getCtx();
          }
      
        }
        else
        {
          if( rapidLFNST )
          {
            endLfnstIdx = lfnstIdx; // break the loop
          }
        }
      }
      if (m_pcEncCfg->m_LFNST && m_pcEncCfg->m_MTS == 2 && modeId && modeId != EndMTS)
      {
        NStopMTS = false;

        if (bestMTS || bestLfnstIdx)
        {
          if ((modeId > 1 && bestMTS == modeId) || modeId == 1)
          {
            NStopMTS = (dct2Cost / trGrpBestCost) < trGrpStopThreshold;
          }
        }
      }
    }

    cu.lfnstIdx = bestLfnstIdx;
    if (dSingleCost != MAX_DOUBLE)
    {
      if (bestLfnstIdx != endLfnstIdx || bestMTS != EndMTS)
      {
        if (cu.ispMode)
        {
          const UnitArea& currArea = partitioner.currArea();
          cs.getRecoBuf(currArea.Y()).copyFrom(saveCS.getRecoBuf(currArea.Y()));

          if (saveCS.tus.size() != cs.tus.size())
          {
            partitioner.splitCurrArea(ispType, cs);

            do
            {
              partitioner.nextPart(cs);
              cs.addTU(CS::getArea(cs, partitioner.currArea(), partitioner.chType, partitioner.treeType),
                partitioner.chType, cs.cus[0]);
            } while (saveCS.tus.size() != cs.tus.size());

            partitioner.exitCurrSplit();
          }

          for (uint32_t j = 0; j < saveCS.tus.size(); j++)
          {
            cs.tus[j]->copyComponentFrom(*saveCS.tus[j], COMP_Y);
          }
        }
        else
        {
          cs.getRecoBuf(tu.Y()).copyFrom(saveCS.getRecoBuf(tu.Y()));

          tu.copyComponentFrom(*tmpTU, COMP_Y);
        }

        m_CABACEstimator->getCtx() = ctxBest;
      }

      // otherwise this would've happened in useSubStructure
      cs.picture->getRecoBuf(currArea.Y()).copyFrom(cs.getRecoBuf(currArea.Y()));
    }
  }
  else
  {
    if (cu.ispMode)
    {
      const PartSplit ispType = CU::getISPType(cu, COMP_Y);
      partitioner.splitCurrArea(ispType, cs);

      CUCtx      cuCtx;
      dSingleCost = xTestISP(cs, partitioner, bestCostForISP, ispType, splitCbfLumaSum, singleFracBits, singleDistLuma, cuCtx);
      partitioner.exitCurrSplit();
      bool storeCost = (numMode == 1) ? true : false;
      if ((m_pcEncCfg->m_ISP >= 2) && (numMode <= 1))
      {
        storeCost = true;
      }
      if (storeCost)
      {
        m_ispTestedModes[0].bestCost[cu.ispMode - 1] = dSingleCost;
      }
    }
    else
    {
      TransformUnit& tu =
        cs.addTU(CS::getArea(cs, currArea, partitioner.chType, partitioner.treeType), partitioner.chType, cs.cus[0]);
      tu.depth = currDepth;

      CHECK(!tu.Y().valid(), "Invalid TU");
      xIntraCodingTUBlock(tu, COMP_Y, false, singleDistLuma, &numSig, predBuf);
      //----- determine rate and r-d cost -----
      m_ispTestedModes[0].IspType = TU_NO_ISP;
      m_ispTestedModes[0].subTuCounter = -1;
      singleFracBits = xGetIntraFracBitsQT(cs, partitioner, true);
      dSingleCost = m_pcRdCost->calcRdCost(singleFracBits, singleDistLuma);
    }
  }

  if (cu.ispMode)
  { 
    for (auto& ptu : cs.tus)
    {
      if (currArea.Y().contains(ptu->Y()))
      {
        TU::setCbfAtDepth(*ptu, COMP_Y, currDepth, splitCbfLumaSum ? 1 : 0);
      }
    }
  }
  cs.dist     += singleDistLuma;
  cs.fracBits += singleFracBits;
  cs.cost      = dSingleCost;

  STAT_COUNT_CU_MODES( partitioner.chType == CH_L, g_cuCounters1D[CU_RD_TESTS][0][!cs.slice->isIntra() + cs.slice->depth] );
  STAT_COUNT_CU_MODES( partitioner.chType == CH_L && !cs.slice->isIntra(), g_cuCounters2D[CU_RD_TESTS][Log2( cs.area.lheight() )][Log2( cs.area.lwidth() )] );
}

ChromaCbfs IntraSearch::xIntraChromaCodingQT(CodingStructure& cs, Partitioner& partitioner)
{
  UnitArea    currArea      = partitioner.currArea();

  if( !currArea.Cb().valid() ) 
    return ChromaCbfs(false);

  TransformUnit& currTU     = *cs.getTU( currArea.chromaPos(), CH_C );
  const CodingUnit& cu  = *cs.getCU( currArea.chromaPos(), CH_C, TREE_D );
  ChromaCbfs cbfs(false);
  uint32_t   currDepth = partitioner.currTrDepth;
  const bool useTS = cs.picture->useTS;
  if (currDepth == currTU.depth)
  {
    if (!currArea.Cb().valid() || !currArea.Cr().valid())
    {
      return cbfs;
    }

    CodingStructure& saveCS = *m_pSaveCS[1];
    saveCS.pcv = cs.pcv;
    saveCS.picture = cs.picture;
    saveCS.area.repositionTo(cs.area);

    TransformUnit& tmpTU = saveCS.tus.empty() ? saveCS.addTU(currArea, partitioner.chType, nullptr) : *saveCS.tus.front();
    tmpTU.initData();
    tmpTU.UnitArea::operator=(currArea);
    const unsigned      numTBlocks = getNumberValidTBlocks(*cs.pcv);

    CompArea& cbArea = currTU.blocks[COMP_Cb];
    CompArea& crArea = currTU.blocks[COMP_Cr];
    double     bestCostCb = MAX_DOUBLE;
    double     bestCostCr = MAX_DOUBLE;
    Distortion bestDistCb = 0;
    Distortion bestDistCr = 0;

    TempCtx ctxStartTU(m_CtxCache);
    TempCtx ctxStart(m_CtxCache);
    TempCtx ctxBest(m_CtxCache);

    ctxStartTU = m_CABACEstimator->getCtx();
    ctxStart = m_CABACEstimator->getCtx();
    currTU.jointCbCr = 0;

    // Do predictions here to avoid repeating the "default0Save1Load2" stuff
    int  predMode = cu.bdpcmM[CH_C] ? BDPCM_IDX : CU::getFinalIntraMode(cu, CH_C);

    PelBuf piPredCb = cs.getPredBuf(COMP_Cb);
    PelBuf piPredCr = cs.getPredBuf(COMP_Cr);

    initIntraPatternChType(*currTU.cu, cbArea);
    initIntraPatternChType(*currTU.cu, crArea);

    if (CU::isLMCMode(predMode))
    {
      loadLMLumaRecPels(cu, cbArea);
      predIntraChromaLM(COMP_Cb, piPredCb, cu, cbArea, predMode);
      predIntraChromaLM(COMP_Cr, piPredCr, cu, crArea, predMode);
    }
    else
    {
      predIntraAng(COMP_Cb, piPredCb, cu);
      predIntraAng(COMP_Cr, piPredCr, cu);
    }

    // determination of chroma residuals including reshaping and cross-component prediction
    //----- get chroma residuals -----
    PelBuf resiCb = cs.getResiBuf(COMP_Cb);
    PelBuf resiCr = cs.getResiBuf(COMP_Cr);
    resiCb.subtract(cs.getOrgBuf(COMP_Cb), piPredCb);
    resiCr.subtract(cs.getOrgBuf(COMP_Cr), piPredCr);

    //----- get reshape parameter ----
    ReshapeData& reshapeData = cs.picture->reshapeData;
    bool doReshaping = (cs.picHeader->lmcsEnabled && cs.picHeader->lmcsChromaResidualScale && (cs.slice->isIntra() || reshapeData.getCTUFlag()) && (cbArea.width * cbArea.height > 4));
    if (doReshaping)
    {
      const Area area = currTU.Y().valid() ? currTU.Y() : Area(recalcPosition(currTU.chromaFormat, currTU.chType, CH_L, currTU.blocks[currTU.chType].pos()), recalcSize(currTU.chromaFormat, currTU.chType, CH_L, currTU.blocks[currTU.chType].size()));
      const CompArea& areaY = CompArea(COMP_Y, currTU.chromaFormat, area);
      currTU.chromaAdj = reshapeData.calculateChromaAdjVpduNei(currTU, areaY, currTU.cu->treeType);
    }

    //===== store original residual signals (std and crossCompPred) =====
    for( int k = 0; k < 5; k++ )
    {
      m_orgResiCb[k].compactResize( cbArea );
      m_orgResiCr[k].compactResize( crArea );
    }
    for (int k = 0; k < 1; k += 4)
    {
      m_orgResiCb[k].copyFrom(resiCb);
      m_orgResiCr[k].copyFrom(resiCr);

      if (doReshaping)
      {
        int cResScaleInv = currTU.chromaAdj;
        m_orgResiCb[k].scaleSignal(cResScaleInv, 1, cs.slice->clpRngs[COMP_Cb]);
        m_orgResiCr[k].scaleSignal(cResScaleInv, 1, cs.slice->clpRngs[COMP_Cr]);
      }
    }

    CUCtx cuCtx;
    cuCtx.isDQPCoded = true;
    cuCtx.isChromaQpAdjCoded = true;
    cuCtx.lfnstLastScanPos = false;

    CodingStructure& saveCScur = *m_pSaveCS[2];

    saveCScur.pcv = cs.pcv;
    saveCScur.picture = cs.picture;
    saveCScur.area.repositionTo(cs.area);

    TransformUnit& tmpTUcur = saveCScur.tus.empty() ? saveCScur.addTU(currArea, partitioner.chType, nullptr) : *saveCScur.tus.front();
    tmpTUcur.initData();
    tmpTUcur.UnitArea::operator=(currArea);

    TempCtx ctxBestTUL(m_CtxCache);

    const SPS& sps = *cs.sps;
    double     bestCostCbcur = MAX_DOUBLE;
    double     bestCostCrcur = MAX_DOUBLE;
    Distortion bestDistCbcur = 0;
    Distortion bestDistCrcur = 0;

    int  endLfnstIdx = (partitioner.isSepTree(cs) && partitioner.chType == CH_C && (partitioner.currArea().lwidth() < 8 || partitioner.currArea().lheight() < 8))
      || (partitioner.currArea().lwidth() > sps.getMaxTbSize() || partitioner.currArea().lheight() > sps.getMaxTbSize()) || !sps.LFNST ? 0 : 2;
    int  startLfnstIdx = 0;
    int  bestLfnstIdx = 0;
    bool testLFNST = sps.LFNST;

    // speedUps LFNST
    bool rapidLFNST = false;
    if (m_pcEncCfg->m_LFNST > 1)
    {
      rapidLFNST = true;
      if (m_pcEncCfg->m_LFNST > 2)
      {
        endLfnstIdx = endLfnstIdx ? 1 : 0;
      }
    }
    int ts_used = 0;
    bool testTS = false;
    if (partitioner.chType != CH_C)
    {
      startLfnstIdx = currTU.cu->lfnstIdx;
      endLfnstIdx = currTU.cu->lfnstIdx;
      bestLfnstIdx = currTU.cu->lfnstIdx;
      testLFNST  = false;
      rapidLFNST = false;
      ts_used = currTU.mtsIdx[COMP_Y];
    }
    if (cu.bdpcmM[CH_C])
    {
      endLfnstIdx = 0;
      testLFNST = false;
    }

    double dSingleCostAll = MAX_DOUBLE;
    double singleCostTmpAll = 0;

    for (int lfnstIdx = startLfnstIdx; lfnstIdx <= endLfnstIdx; lfnstIdx++)
    {
      if (rapidLFNST && lfnstIdx)
      {
        if ((lfnstIdx == 2) && (bestLfnstIdx == 0))
        {
          continue;
        }
      }

      currTU.cu->lfnstIdx = lfnstIdx;
      if (lfnstIdx)
      {
        m_CABACEstimator->getCtx() = ctxStartTU;
      }

      cuCtx.lfnstLastScanPos = false;
      cuCtx.violatesLfnstConstrained[CH_L] = false;
      cuCtx.violatesLfnstConstrained[CH_C] = false;

      for (uint32_t c = COMP_Cb; c < numTBlocks; c++)
      {
        const ComponentID compID = ComponentID(c);
        const CompArea& area = currTU.blocks[compID];
        double     dSingleCost = MAX_DOUBLE;
        Distortion singleDistCTmp = 0;
        double     singleCostTmp = 0;
        bool tsAllowed = useTS && TU::isTSAllowed(currTU, compID) && m_pcEncCfg->m_useChromaTS && !currTU.cu->lfnstIdx && !cu.bdpcmM[CH_C];
        if ((partitioner.chType == CH_L) && (!ts_used))
        {
          tsAllowed = false;
        }
        uint8_t nNumTransformCands = 1 + (tsAllowed ? 1 : 0); // DCT + TS = 2 tests       
        std::vector<TrMode> trModes;
        if (nNumTransformCands > 1)
        {
          trModes.push_back(TrMode(0, true));   // DCT2
          trModes.push_back(TrMode(1, true));   // TS
          testTS = true;
        }
        bool cbfDCT2 = true;
        const bool isLastMode = testLFNST || cs.sps->jointCbCr ||  tsAllowed ? false : true;
        int bestModeId = 0;
        ctxStart = m_CABACEstimator->getCtx();
        for (int modeId = 0; modeId < nNumTransformCands; modeId++)
        {
          if (doReshaping || lfnstIdx || modeId)
          {
            resiCb.copyFrom(m_orgResiCb[0]);
            resiCr.copyFrom(m_orgResiCr[0]);
          }
          if (modeId == 0)
          {
            if ( tsAllowed)
            {
              xPreCheckMTS(currTU, &trModes, m_pcEncCfg->m_MTSIntraMaxCand, 0, compID);
            }
          }

          currTU.mtsIdx[compID] = currTU.cu->bdpcmM[CH_C] ? MTS_SKIP : modeId;

          if (modeId)
          {
            if (!cbfDCT2 && trModes[modeId].first == MTS_SKIP)
            {
              break;
            }
            m_CABACEstimator->getCtx() = ctxStart;
          }
          singleDistCTmp = 0;
          if (tsAllowed)
          {
            xIntraCodingTUBlock(currTU, compID, false, singleDistCTmp, 0, 0, true);
            if ((modeId == 0) && (!trModes[modeId + 1].second))
            {
              nNumTransformCands = 1;
            }
          }
          else
        {
          xIntraCodingTUBlock(currTU, compID, false, singleDistCTmp);
        }
        if (((currTU.mtsIdx[compID] == MTS_SKIP && !currTU.cu->bdpcmM[CH_C])
          && !TU::getCbf(currTU, compID)))   // In order not to code TS flag when cbf is zero, the case for TS with
                                             // cbf being zero is forbidden.
        {
          singleCostTmp = MAX_DOUBLE;
        }
        else
        {
          uint64_t fracBitsTmp = xGetIntraFracBitsQTChroma(currTU, compID, &cuCtx);
          singleCostTmp = m_pcRdCost->calcRdCost(fracBitsTmp, singleDistCTmp);
        }

        if (singleCostTmp < dSingleCost)
        {
          dSingleCost = singleCostTmp;

          if (compID == COMP_Cb)
          {
            bestCostCb = singleCostTmp;
            bestDistCb = singleDistCTmp;
          }
          else
          {
            bestCostCr = singleCostTmp;
            bestDistCr = singleDistCTmp;
          }
          bestModeId = modeId;
          if (currTU.mtsIdx[compID] == MTS_DCT2_DCT2)
          {
            cbfDCT2 = TU::getCbfAtDepth(currTU, compID, currDepth);
          }
          if (!isLastMode)
          {
            saveCS.getRecoBuf(area).copyFrom(cs.getRecoBuf(area));
            tmpTU.copyComponentFrom(currTU, compID);
            ctxBest = m_CABACEstimator->getCtx();
          }
        }
        }
        if (testTS && ((c == COMP_Cb && bestModeId < (nNumTransformCands - 1)) ))
        {
          m_CABACEstimator->getCtx() = ctxBest;

          currTU.copyComponentFrom(tmpTU, COMP_Cb); // Cbf of Cb is needed to estimate cost for Cr Cbf
        }
      }

      singleCostTmpAll = bestCostCb + bestCostCr;

      bool rootCbfL = false;
      if (testLFNST)
      {
        for (uint32_t t = 0; t < getNumberValidTBlocks(*cs.pcv); t++)
        {
          rootCbfL |= bool(tmpTU.cbf[t]);
        }
        if (rapidLFNST && !rootCbfL)
        {
          endLfnstIdx = lfnstIdx; // end this
        }
      }

      if (testLFNST && lfnstIdx && !cuCtx.lfnstLastScanPos)
      {
        bool cbfAtZeroDepth = CU::isSepTree(*currTU.cu)
          ? rootCbfL : (cs.area.chromaFormat != CHROMA_400
            && std::min(tmpTU.blocks[1].width, tmpTU.blocks[1].height) < 4)
          ? TU::getCbfAtDepth(currTU, COMP_Y, currTU.depth) : rootCbfL;
        if (cbfAtZeroDepth)
        {
          singleCostTmpAll = MAX_DOUBLE;
        }
      }
      if ((testLFNST || testTS) && (singleCostTmpAll < dSingleCostAll))
      {
        bestLfnstIdx = lfnstIdx;
        if ((lfnstIdx != endLfnstIdx) || testTS)
        {
          dSingleCostAll = singleCostTmpAll;

          bestCostCbcur = bestCostCb;
          bestCostCrcur = bestCostCr;
          bestDistCbcur = bestDistCb;
          bestDistCrcur = bestDistCr;

          saveCScur.getRecoBuf(cbArea).copyFrom(saveCS.getRecoBuf(cbArea));
          saveCScur.getRecoBuf(crArea).copyFrom(saveCS.getRecoBuf(crArea));

          tmpTUcur.copyComponentFrom(tmpTU, COMP_Cb);
          tmpTUcur.copyComponentFrom(tmpTU, COMP_Cr);
        }
        ctxBestTUL = m_CABACEstimator->getCtx();
      }
    }
    if ((testLFNST && (bestLfnstIdx != endLfnstIdx)) || testTS)
    {
      bestCostCb = bestCostCbcur;
      bestCostCr = bestCostCrcur;
      bestDistCb = bestDistCbcur;
      bestDistCr = bestDistCrcur;
      currTU.cu->lfnstIdx = bestLfnstIdx;
      if (!cs.sps->jointCbCr)
      {
        cs.getRecoBuf(cbArea).copyFrom(saveCScur.getRecoBuf(cbArea));
        cs.getRecoBuf(crArea).copyFrom(saveCScur.getRecoBuf(crArea));

        currTU.copyComponentFrom(tmpTUcur, COMP_Cb);
        currTU.copyComponentFrom(tmpTUcur, COMP_Cr);

        m_CABACEstimator->getCtx() = ctxBestTUL;
      }
    }

    Distortion bestDistCbCr = bestDistCb + bestDistCr;

    if (cs.sps->jointCbCr)
    {
      if ((testLFNST && (bestLfnstIdx != endLfnstIdx)) || testTS)
      {
        saveCS.getRecoBuf(cbArea).copyFrom(saveCScur.getRecoBuf(cbArea));
        saveCS.getRecoBuf(crArea).copyFrom(saveCScur.getRecoBuf(crArea));

        tmpTU.copyComponentFrom(tmpTUcur, COMP_Cb);
        tmpTU.copyComponentFrom(tmpTUcur, COMP_Cr);
        m_CABACEstimator->getCtx() = ctxBestTUL;
        ctxBest = m_CABACEstimator->getCtx();
      }
      // Test using joint chroma residual coding
      double     bestCostCbCr = bestCostCb + bestCostCr;
      int        bestJointCbCr = 0;
      bool checkDCTOnly = m_pcEncCfg->m_useChromaTS && ((TU::getCbf(tmpTU, COMP_Cb) && tmpTU.mtsIdx[COMP_Cb] == MTS_DCT2_DCT2 && !TU::getCbf(tmpTU, COMP_Cr)) ||
        (TU::getCbf(tmpTU, COMP_Cr) && tmpTU.mtsIdx[COMP_Cr] == MTS_DCT2_DCT2 && !TU::getCbf(tmpTU, COMP_Cb)) ||
        (TU::getCbf(tmpTU, COMP_Cb) && tmpTU.mtsIdx[COMP_Cb] == MTS_DCT2_DCT2 && TU::getCbf(tmpTU, COMP_Cr) && tmpTU.mtsIdx[COMP_Cr] == MTS_DCT2_DCT2));
      bool checkTSOnly = m_pcEncCfg->m_useChromaTS && ((TU::getCbf(tmpTU, COMP_Cb) && tmpTU.mtsIdx[COMP_Cb] == MTS_SKIP && !TU::getCbf(tmpTU, COMP_Cr)) ||
        (TU::getCbf(tmpTU, COMP_Cr) && tmpTU.mtsIdx[COMP_Cr] == MTS_SKIP && !TU::getCbf(tmpTU, COMP_Cb)) ||
        (TU::getCbf(tmpTU, COMP_Cb) && tmpTU.mtsIdx[COMP_Cb] == MTS_SKIP && TU::getCbf(tmpTU, COMP_Cr) && tmpTU.mtsIdx[COMP_Cr] == MTS_SKIP));
      bool       lastIsBest = false;
      bool noLFNST1 = false;
      if (rapidLFNST && (startLfnstIdx != endLfnstIdx))
      {
        if (bestLfnstIdx == 2)
        {
          noLFNST1 = true;
        }
        else
        {
          endLfnstIdx = 1;
        }
      }

      for (int lfnstIdxj = startLfnstIdx; lfnstIdxj <= endLfnstIdx; lfnstIdxj++)
      {
        if (rapidLFNST && noLFNST1 && (lfnstIdxj == 1))
        {
          continue;
        }
        currTU.cu->lfnstIdx = lfnstIdxj;
        std::vector<int> jointCbfMasksToTest;
        if (TU::getCbf(tmpTU, COMP_Cb) || TU::getCbf(tmpTU, COMP_Cr))
        {
          jointCbfMasksToTest = m_pcTrQuant->selectICTCandidates(currTU, m_orgResiCb, m_orgResiCr);
        }
        for (int cbfMask : jointCbfMasksToTest)
        {
          currTU.jointCbCr = (uint8_t)cbfMask;
          ComponentID codeCompId = ((currTU.jointCbCr >> 1) ? COMP_Cb : COMP_Cr);
          ComponentID otherCompId = ((codeCompId == COMP_Cb) ? COMP_Cr : COMP_Cb);
          bool tsAllowed = useTS && TU::isTSAllowed(currTU, codeCompId) && (m_pcEncCfg->m_useChromaTS) && !currTU.cu->lfnstIdx && !cu.bdpcmM[CH_C];
          if ((partitioner.chType == CH_L)&& tsAllowed && (currTU.mtsIdx[COMP_Y] != MTS_SKIP))
          {
            tsAllowed = false;
          }
          if (!tsAllowed)
          {
            checkTSOnly = false;
          }
          uint8_t     numTransformCands = 1 + (tsAllowed && !(checkDCTOnly || checkTSOnly)? 1 : 0); // DCT + TS = 2 tests
          std::vector<TrMode> trModes;
          if (numTransformCands > 1)
          {
            trModes.push_back(TrMode(0, true)); // DCT2
            trModes.push_back(TrMode(1, true));//TS
          }
          else
          {
            currTU.mtsIdx[codeCompId] = checkTSOnly || currTU.cu->bdpcmM[CH_C] ? 1 : 0;
          }

          for (int modeId = 0; modeId < numTransformCands; modeId++)
          {
            Distortion distTmp = 0;
            currTU.mtsIdx[codeCompId] = currTU.cu->bdpcmM[CH_C] ? MTS_SKIP : MTS_DCT2_DCT2;
            if (numTransformCands > 1)
            {
              currTU.mtsIdx[codeCompId] = currTU.cu->bdpcmM[CH_C] ? MTS_SKIP : trModes[modeId].first;
            }
            currTU.mtsIdx[otherCompId] = MTS_DCT2_DCT2;

            m_CABACEstimator->getCtx() = ctxStartTU;

            resiCb.copyFrom(m_orgResiCb[cbfMask]);
            resiCr.copyFrom(m_orgResiCr[cbfMask]);
            if ((modeId == 0) && (numTransformCands > 1))
            {
              xPreCheckMTS(currTU, &trModes, m_pcEncCfg->m_MTSIntraMaxCand, 0, COMP_Cb);
              currTU.mtsIdx[codeCompId] = trModes[modeId].first;
              currTU.mtsIdx[(codeCompId == COMP_Cr) ? COMP_Cb : COMP_Cr] = MTS_DCT2_DCT2;
            }
            cuCtx.lfnstLastScanPos = false;
            cuCtx.violatesLfnstConstrained[CH_L] = false;
            cuCtx.violatesLfnstConstrained[CH_C] = false;
            if (numTransformCands > 1)
            {
              xIntraCodingTUBlock(currTU, COMP_Cb, false, distTmp, 0, 0, true);
              if ((modeId == 0) && !trModes[modeId + 1].second)
              {
                numTransformCands = 1;
              }
            }
            else
            {
              xIntraCodingTUBlock(currTU, COMP_Cb, false, distTmp, 0);
            }

            double costTmp = std::numeric_limits<double>::max();
            if (distTmp < MAX_DISTORTION)
            {
              uint64_t bits = xGetIntraFracBitsQTChroma(currTU, COMP_Cb, &cuCtx);
              costTmp = m_pcRdCost->calcRdCost(bits, distTmp);
            }
            else if (!currTU.mtsIdx[codeCompId])
            {
              numTransformCands = 1;
            }
            bool rootCbfL = false;
            for (uint32_t t = 0; t < getNumberValidTBlocks(*cs.pcv); t++)
            {
              rootCbfL |= bool(tmpTU.cbf[t]);
            }
            if (rapidLFNST && !rootCbfL)
            {
              endLfnstIdx = lfnstIdxj;
            }
            if (testLFNST && currTU.cu->lfnstIdx && !cuCtx.lfnstLastScanPos)
            {
              bool cbfAtZeroDepth = CU::isSepTree(*currTU.cu) ? rootCbfL
                : (cs.area.chromaFormat != CHROMA_400 && std::min(tmpTU.blocks[1].width, tmpTU.blocks[1].height) < 4)
                ? TU::getCbfAtDepth(currTU, COMP_Y, currTU.depth) : rootCbfL;
              if (cbfAtZeroDepth)
              {
                costTmp = MAX_DOUBLE;
              }
            }
            if (costTmp < bestCostCbCr)
            {
              bestCostCbCr = costTmp;
              bestDistCbCr = distTmp;
              bestJointCbCr = currTU.jointCbCr;

              // store data
              bestLfnstIdx = lfnstIdxj;
              if ((cbfMask != jointCbfMasksToTest.back() || (lfnstIdxj != endLfnstIdx)) || (modeId != (numTransformCands - 1)))
              {
                saveCS.getRecoBuf(cbArea).copyFrom(cs.getRecoBuf(cbArea));
                saveCS.getRecoBuf(crArea).copyFrom(cs.getRecoBuf(crArea));

                tmpTU.copyComponentFrom(currTU, COMP_Cb);
                tmpTU.copyComponentFrom(currTU, COMP_Cr);

                ctxBest = m_CABACEstimator->getCtx();
              }
              else
              {
                lastIsBest = true;
                cs.cus[0]->lfnstIdx = bestLfnstIdx;
              }
            }
          }
        }

        // Retrieve the best CU data (unless it was the very last one tested)
      }
      if (!lastIsBest)
      {
        cs.getRecoBuf(cbArea).copyFrom(saveCS.getRecoBuf(cbArea));
        cs.getRecoBuf(crArea).copyFrom(saveCS.getRecoBuf(crArea));

        cs.cus[0]->lfnstIdx = bestLfnstIdx;
        currTU.copyComponentFrom(tmpTU, COMP_Cb);
        currTU.copyComponentFrom(tmpTU, COMP_Cr);
        m_CABACEstimator->getCtx() = ctxBest;
      }
      currTU.jointCbCr = (TU::getCbf(currTU, COMP_Cb) || TU::getCbf(currTU, COMP_Cr)) ? bestJointCbCr : 0;
    } // jointCbCr

    cs.dist += bestDistCbCr;
    cuCtx.violatesLfnstConstrained[CH_L] = false;
    cuCtx.violatesLfnstConstrained[CH_C] = false;
    cuCtx.lfnstLastScanPos = false;
    cuCtx.violatesMtsCoeffConstraint = false;
    cuCtx.mtsLastScanPos = false;
    cbfs.cbf(COMP_Cb) = TU::getCbf(currTU, COMP_Cb);
    cbfs.cbf(COMP_Cr) = TU::getCbf(currTU, COMP_Cr);
  }
  else
  {
    unsigned   numValidTBlocks = getNumberValidTBlocks(*cs.pcv);
    ChromaCbfs SplitCbfs(false);

    if (partitioner.canSplit(TU_MAX_TR_SPLIT, cs))
    {
      partitioner.splitCurrArea(TU_MAX_TR_SPLIT, cs);
    }
    else if (currTU.cu->ispMode)
    {
      partitioner.splitCurrArea(m_ispTestedModes[0].IspType, cs);
    }
    else
      THROW("Implicit TU split not available");

    do
    {
      ChromaCbfs subCbfs = xIntraChromaCodingQT(cs, partitioner);

      for (uint32_t ch = COMP_Cb; ch < numValidTBlocks; ch++)
      {
        const ComponentID compID = ComponentID(ch);
        SplitCbfs.cbf(compID) |= subCbfs.cbf(compID);
      }
    } while (partitioner.nextPart(cs));

    partitioner.exitCurrSplit();

    /*if (lumaUsesISP && cs.dist == MAX_UINT) //ahenkel
    {
      return cbfs;
    }*/
    {
      cbfs.Cb |= SplitCbfs.Cb;
      cbfs.Cr |= SplitCbfs.Cr;

      if (1)   //(!lumaUsesISP)
      {
        for (auto& ptu : cs.tus)
        {
          if (currArea.Cb().contains(ptu->Cb()) || (!ptu->Cb().valid() && currArea.Y().contains(ptu->Y())))
          {
            TU::setCbfAtDepth(*ptu, COMP_Cb, currDepth, SplitCbfs.Cb);
            TU::setCbfAtDepth(*ptu, COMP_Cr, currDepth, SplitCbfs.Cr);
          }
        }
      }
    }
  }
  return cbfs;
}

uint64_t IntraSearch::xFracModeBitsIntraLuma(const CodingUnit& cu, const unsigned* mpmLst)
{
  m_CABACEstimator->resetBits();

  if (!cu.ciip)
  {
    m_CABACEstimator->intra_luma_pred_mode(cu, mpmLst);
  }

  return m_CABACEstimator->getEstFracBits();
}

template<typename T, size_t N, int M>
void IntraSearch::xReduceHadCandList(static_vector<T, N>& candModeList, static_vector<double, N>& candCostList, SortedPelUnitBufs<M>& sortedPelBuffer, int& numModesForFullRD, const double thresholdHadCost, const double* mipHadCost, const CodingUnit& cu, const bool fastMip)
{
  const int maxCandPerType = numModesForFullRD >> 1;
  static_vector<ModeInfo, FAST_UDI_MAX_RDMODE_NUM> tempRdModeList;
  static_vector<double, FAST_UDI_MAX_RDMODE_NUM> tempCandCostList;
  const double minCost = candCostList[0];
  bool keepOneMip = candModeList.size() > numModesForFullRD;
  const int maxNumConv = 3; 

  int numConv = 0;
  int numMip = 0;
  for (int idx = 0; idx < candModeList.size() - (keepOneMip?0:1); idx++)
  {
    bool addMode = false;
    const ModeInfo& orgMode = candModeList[idx];

    if (!orgMode.mipFlg)
    {
      addMode = (numConv < maxNumConv);
      numConv += addMode ? 1:0;
    }
    else
    {
      addMode = ( numMip < maxCandPerType || (candCostList[idx] < thresholdHadCost * minCost) || keepOneMip );
      keepOneMip = false;
      numMip += addMode ? 1:0;
    }
    if( addMode )
    {
      tempRdModeList.push_back(orgMode);
      tempCandCostList.push_back(candCostList[idx]);
    }
  }

  // sort Pel Buffer
  int i = -1;
  for( auto &m: tempRdModeList)
  {
    if( ! (m == candModeList.at( ++i )) )
    {
      for( int j = i; j < (int)candModeList.size()-1; )
      {
        if( m == candModeList.at( ++j ) )
        {
          sortedPelBuffer.swap( i, j);
          break;
        }
      }
    }
  }
  sortedPelBuffer.reduceTo( (int)tempRdModeList.size() );

  if ((cu.lwidth() > 8 && cu.lheight() > 8))
  {
    // Sort MIP candidates by Hadamard cost
    const int transpOff = getNumModesMip(cu.Y());
    static_vector<uint8_t, FAST_UDI_MAX_RDMODE_NUM> sortedMipModes(0);
    static_vector<double, FAST_UDI_MAX_RDMODE_NUM> sortedMipCost(0);
    for (uint8_t mode : { 0, 1, 2 })
    {
      uint8_t candMode = mode + uint8_t((mipHadCost[mode + transpOff] < mipHadCost[mode]) ? transpOff : 0);
      updateCandList(candMode, mipHadCost[candMode], sortedMipModes, sortedMipCost, 3);
    }

    // Append MIP mode to RD mode list
    const int modeListSize = int(tempRdModeList.size());
    for (int idx = 0; idx < 3; idx++)
    {
      const bool     isTransposed = (sortedMipModes[idx] >= transpOff ? true : false);
      const uint32_t mipIdx       = (isTransposed ? sortedMipModes[idx] - transpOff : sortedMipModes[idx]);
      const ModeInfo mipMode( true, isTransposed, 0, NOT_INTRA_SUBPARTITIONS, mipIdx );
      bool alreadyIncluded = false;
      for (int modeListIdx = 0; modeListIdx < modeListSize; modeListIdx++)
      {
        if (tempRdModeList[modeListIdx] == mipMode)
        {
          alreadyIncluded = true;
          break;
        }
      }

      if (!alreadyIncluded)
      {
        tempRdModeList.push_back(mipMode);
        tempCandCostList.push_back(0);
        if( fastMip ) break;
      }
    }
  }

  candModeList = tempRdModeList;
  candCostList = tempCandCostList;
  numModesForFullRD = int(candModeList.size());
}

void IntraSearch::xPreCheckMTS(TransformUnit &tu, std::vector<TrMode> *trModes, const int maxCand, PelUnitBuf *predBuf, const ComponentID& compID)
{
  if (compID == COMP_Y)
  {
    CodingStructure&  cs = *tu.cs;
    const CompArea& area = tu.blocks[compID];
    const ReshapeData& reshapeData = cs.picture->reshapeData;
    const CodingUnit& cu = *cs.getCU(area.pos(), CH_L,TREE_D);
    PelBuf piPred = cs.getPredBuf(area);
    PelBuf piResi = cs.getResiBuf(area);

    initIntraPatternChType(*tu.cu, area);
    if (predBuf)
    {
      piPred.copyFrom(predBuf->Y());
    }
    else if (CU::isMIP(cu, CH_L))
    {
      initIntraMip(cu);
      predIntraMip(piPred, cu);
    }
    else
    {
      predIntraAng(COMP_Y, piPred, cu);
    }

    //===== get residual signal =====
    if (cs.picHeader->lmcsEnabled && reshapeData.getCTUFlag())
    {
      piResi.subtract(cs.getRspOrgBuf(), piPred);
    }
    else
    {
      CPelBuf piOrg = cs.getOrgBuf(COMP_Y);
      piResi.subtract(piOrg, piPred);
    }
    m_pcTrQuant->checktransformsNxN(tu, trModes, m_pcEncCfg->m_MTSIntraMaxCand, compID);
  }
  else
  {
    ComponentID codeCompId = (tu.jointCbCr ? (tu.jointCbCr >> 1 ? COMP_Cb : COMP_Cr) : compID);
    m_pcTrQuant->checktransformsNxN(tu, trModes, m_pcEncCfg->m_MTSIntraMaxCand, codeCompId);
  }
}

double IntraSearch::xTestISP(CodingStructure& cs, Partitioner& subTuPartitioner, double bestCostForISP, PartSplit ispType, bool& splitcbf, uint64_t& singleFracBits, Distortion& singleDistLuma, CUCtx& cuCtx)
{
  int  subTuCounter = 0;
  bool earlySkipISP = false;
  bool splitCbfLuma = false;
  CodingUnit& cu = *cs.cus[0];

  Distortion singleDistTmpLumaSUM = 0;
  uint64_t   singleTmpFracBitsSUM = 0;
  double     singleCostTmpSUM = 0;
  cuCtx.isDQPCoded = true;
  cuCtx.isChromaQpAdjCoded = true;

  do
  {
    Distortion singleDistTmpLuma = 0;
    uint64_t   singleTmpFracBits = 0;
    double     singleCostTmp = 0;
    TransformUnit& tmpTUcur = ((cs.tus.size() < (subTuCounter + 1)))
      ? cs.addTU(CS::getArea(cs, subTuPartitioner.currArea(), subTuPartitioner.chType,
        subTuPartitioner.treeType),
        subTuPartitioner.chType, cs.cus[0])
      : *cs.tus[subTuCounter];
    tmpTUcur.depth = subTuPartitioner.currTrDepth;

    // Encode TU
    xIntraCodingTUBlock(tmpTUcur, COMP_Y, false, singleDistTmpLuma, 0);
    cuCtx.mtsLastScanPos = false;

    if (singleDistTmpLuma == MAX_INT)   // all zero CBF skip
    {
      earlySkipISP = true;
      singleCostTmpSUM = MAX_DOUBLE;
      break;
    }

    if (m_pcRdCost->calcRdCost(singleTmpFracBitsSUM, singleDistTmpLumaSUM + singleDistTmpLuma) > bestCostForISP)
    {
      earlySkipISP = true;
    }
    else
    {
      m_ispTestedModes[0].IspType = ispType;
      m_ispTestedModes[0].subTuCounter = subTuCounter;
      singleTmpFracBits = xGetIntraFracBitsQT(cs, subTuPartitioner, true, &cuCtx);
    }
    singleCostTmp = m_pcRdCost->calcRdCost(singleTmpFracBits, singleDistTmpLuma);

    singleCostTmpSUM     += singleCostTmp;
    singleDistTmpLumaSUM += singleDistTmpLuma;
    singleTmpFracBitsSUM += singleTmpFracBits;

    subTuCounter++;

    splitCbfLuma |= TU::getCbfAtDepth( *cs.getTU(subTuPartitioner.currArea().lumaPos(), subTuPartitioner.chType, subTuCounter - 1), 
                                       COMP_Y, subTuPartitioner.currTrDepth);
    int nSubPartitions = m_ispTestedModes[cu.lfnstIdx].numTotalParts[cu.ispMode - 1];
    bool doStop = (m_pcEncCfg->m_ISP != 1) || (subTuCounter < nSubPartitions);
    if (doStop)
    {
      if (singleCostTmpSUM > bestCostForISP)
      {
        earlySkipISP = true;
        break;
      }
      if (subTuCounter < nSubPartitions)
      {
        double threshold = nSubPartitions == 2 ? 0.95 : subTuCounter == 1 ? 0.83 : 0.91;
        if (singleCostTmpSUM > bestCostForISP * threshold)
        {
          earlySkipISP = true;
          break;
        }
      }
    }
  } while (subTuPartitioner.nextPart(cs));
  singleDistLuma = singleDistTmpLumaSUM;
  singleFracBits = singleTmpFracBitsSUM;

  splitcbf = splitCbfLuma;
  return earlySkipISP ? MAX_DOUBLE : singleCostTmpSUM;
}

int IntraSearch::xSpeedUpISP(int speed, bool& testISP, int mode, int& noISP, int& endISP, CodingUnit& cu, static_vector<ModeInfo, FAST_UDI_MAX_RDMODE_NUM>& RdModeList, const ModeInfo& bestPUMode, int bestISP, int bestLfnstIdx)
{
  if (speed)
  {
    if (mode >= 1)
    {
      if (m_ispTestedModes[0].splitIsFinished[1] && m_ispTestedModes[0].splitIsFinished[0])
      {
        testISP = false;
        endISP = 0;
      }
      else
      {
        if (m_pcEncCfg->m_ISP >= 2)
        {
          if (mode == 1) //best Hor||Ver
          {
            int bestDir = 0;
            for (int d = 0; d < 2; d++)
            {
              int d2 = d ? 0 : 1;
              if ((m_ispTestedModes[0].bestCost[d] <= m_ispTestedModes[0].bestCost[d2])
                && (m_ispTestedModes[0].bestCost[d] != MAX_DOUBLE))
              {
                bestDir = d + 1;
                m_ispTestedModes[0].splitIsFinished[d2] = true;
              }
            }
            m_ispTestedModes[0].bestModeSoFar = bestDir;
            if (m_ispTestedModes[0].bestModeSoFar <= 0)
            {
              m_ispTestedModes[0].splitIsFinished[1] = true;
              m_ispTestedModes[0].splitIsFinished[0] = true;
              testISP = false;
              endISP = 0;
            }
          }
          if (m_ispTestedModes[0].bestModeSoFar == 2)
          {
            noISP = 1;
          }
          else
          {
            endISP = 1;
          }
        }
      }
    }
    if (testISP)
    {
      if (mode == 2)
      {
        for (int d = 0; d < 2; d++)
        {
          int d2 = d ? 0 : 1;
          if (m_ispTestedModes[0].bestCost[d] == MAX_DOUBLE)
          {
            m_ispTestedModes[0].splitIsFinished[d] = true;
          }
          if ((m_ispTestedModes[0].bestCost[d2] < 1.3 * m_ispTestedModes[0].bestCost[d])
            && (int(m_ispTestedModes[0].bestSplitSoFar) != (d + 1)))
          {
            if (d)
            {
              endISP = 1;
            }
            else
            {
              noISP = 1;
            }
            m_ispTestedModes[0].splitIsFinished[d] = true;
          }
        }
      }
      else
      {
        if (m_ispTestedModes[0].splitIsFinished[0])
        {
          noISP = 1;
        }
        if (m_ispTestedModes[0].splitIsFinished[1])
        {
          endISP = 1;
        }
      }
    }
    if ((noISP == 1) && (endISP == 1))
    {
      endISP = 0;
    }
  }
  else
  {
    bool stopFound = false;
    if (m_pcEncCfg->m_ISP >= 3)
    {
      if (mode)
      {
        if ((bestISP == 0) || ((bestPUMode.modeId != RdModeList[mode - 1].modeId)
          && (bestPUMode.modeId != RdModeList[mode].modeId)))
        {
          stopFound = true;
        }
      }
    }
    if (cu.mipFlag || cu.multiRefIdx)
    {
      cu.mipFlag = false;
      cu.multiRefIdx = 0;
      if (!stopFound)
      {
        for (int k = 0; k < mode; k++)
        {
          if (cu.intraDir[CH_L] == RdModeList[k].modeId)
          {
            stopFound = true;
            break;
          }
        }
      }
    }
    if (stopFound)
    {
      testISP = false;
      endISP = 0;
      return 1;
    }
    if (!stopFound && (m_pcEncCfg->m_ISP >= 2) && (cu.intraDir[CH_L] == DC_IDX))
    {
      stopFound = true;
      endISP = 0;
      return 1;
    }
  }
  return 0;
}

void IntraSearch::xSpeedUpIntra(double bestcost, int& EndMode, int& speedIntra, CodingUnit& cu)
{
  int bestIdxbefore = m_ispTestedModes[0].bestIntraMode;
  if (m_ispTestedModes[0].isIntra)
  {
    if (bestIdxbefore == 1)//ISP
    {
      speedIntra = 14;
    }
    if (bestIdxbefore == 4)//MTS
    {
      speedIntra = 3;
    }
  }
  else if (!cu.cs->slice->isIntra())
  {
    if (bestcost != MAX_DOUBLE)
    {
      speedIntra = 10;
    }
  }
  if (m_ispTestedModes[0].bestBefore[0] == -1)
  {
    speedIntra |= 7;
    if (m_pcEncCfg->m_FastIntraTools == 2)
    {
      EndMode = 1;
    }
  }
  if (!cu.cs->slice->isIntra())
  {
    if ((m_ispTestedModes[0].bestBefore[1] == 1) || (m_ispTestedModes[0].bestBefore[2] == 1))
    {
      speedIntra |= 2;
    }
    if ((m_ispTestedModes[0].bestBefore[1] == 4) || (m_ispTestedModes[0].bestBefore[2] == 4))
    {
      speedIntra |= 3;
    }
    if ((m_ispTestedModes[0].bestBefore[1] == 2) || (m_ispTestedModes[0].bestBefore[2] == 2))
    {
      speedIntra |= 1;
    }
  }
}

} // namespace vvenc

//! \}


Coverage Report

Created: 2026-04-01 07:49