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/** \file     CodingStructure.h

 *  \brief    A class managing the coding information for a specific image part

 */

#include "CodingStructure.h"

#include "Unit.h"

#include "Slice.h"

#include "Picture.h"

#include "UnitTools.h"

#include "UnitPartitioner.h"

namespace vvdec

{

const UnitScale UnitScaleArray[NUM_CHROMA_FORMAT][MAX_NUM_COMPONENT] =

{

  { {2,2}, {0,0}, {0,0} },  // 4:0:0

  { {2,2}, {1,1}, {1,1} },  // 4:2:0

  { {2,2}, {1,2}, {1,2} },  // 4:2:2

  { {2,2}, {2,2}, {2,2} }   // 4:4:4

};

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

// coding structure method definitions

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

CodingStructure::CodingStructure( CUChunkCache* cuChunkCache, TUChunkCache* tuChunkCache, CUMapCache* cuMapCache, CUMapCache* chromaCuMapCache )

  : area      ()

  , picture   ( nullptr )

  , m_ctuData ( nullptr )

  , m_ctuDataSize( 0 )

  , m_dmvrMvCache ( nullptr )

  , m_cuCache ( cuChunkCache )

  , m_tuCache ( tuChunkCache )

  , m_cuMapCache( cuMapCache )

  , m_chromaCuMapCache( chromaCuMapCache )

  , m_chromaCuMapSize( 0 )

  , m_cuMap   ( nullptr )

  , m_cuMapSize( 0 )

  , m_colMiMap ( nullptr )

  , m_colMiMapSize ( 0 )

  , m_IBCBufferWidth( 0 )

{

}

void CodingStructure::destroy()

{

  picture   = nullptr;

  m_reco.destroy();

  m_rec_wrap.destroy();

  m_virtualIBCbuf.clear();

  deallocTempInternals();

  m_ctuData.reset();

  m_ctuDataSize = 0;

  m_colMiMap.reset();

  m_colMiMapSize = 0;

  m_cuMap.reset();

  m_cuMapSize = 0;

}

void CodingStructure::resetForUse()

{

  vps.reset();

  sps.reset();

  pps.reset();

  picHeader.reset();

  std::fill( std::begin( alfApss ), std::end( alfApss ), nullptr );

  lmcsAps.reset();

  pcv = nullptr;

}

CodingUnit& CodingStructure::addCU( const UnitArea &unit, const ChannelType chType, const TreeType treeType, const ModeType modeType, const CodingUnit *cuLeft, const CodingUnit *cuAbove )

{

  CodingUnit *cu = m_cuCache.get();

  memset( NO_WARNING_class_memaccess( cu ), 0, sizeof( CodingUnit ) );

  cu->minInit    ( unit );

  cu->cs         = this;

  cu->setChType  ( chType );

  cu->setTreeType( treeType );

  cu->setModeType( modeType );

  const int currRsAddr = ctuRsAddr( unit.blocks[chType].pos(), chType );

  uint32_t numCh = getNumberValidChannels( area.chromaFormat );

  CtuData& ctuData = getCtuData( currRsAddr );

  cu->ctuData      = &ctuData;

  if( !ctuData.firstCU )

  {

    ctuData.firstCU = cu;

  }

  cu->idx = ++ctuData.numCUs;

  CodingUnit* prevCU = cu;

  std::swap( ctuData.lastCU, prevCU );

  if( prevCU ) prevCU->next = cu;

  cu->predBufOff = ctuData.predBufOffset;

  const bool sharedCuMap = ctuData.cuPtr[CH_C] == ctuData.cuPtr[CH_L];

  if( sharedCuMap && numCh > 1 && !( cu->blocks[CH_L].valid() && cu->blocks[CH_C].valid() ) )

  {

    separateChromaCuMap( ctuData );

  }

  for( uint32_t i = 0; i < numCh; i++ )

  {

    if( !cu->blocks[i].valid() )

    {

      continue;

    }

    const int cuArea = cu->blocks[i].area();

    if( i )

    {

      ctuData.predBufOffset += ( cuArea << 1 );

    }

    else

    {

      ctuData.predBufOffset += cuArea;

    }

    const ptrdiff_t  stride = ptrdiff_t( 1 ) << m_ctuWidthLog2[i];

    const Area&      _blk   = cu->blocks[i];

    const UnitScale  scale  = unitScale[i];

    const int        sclX   = scale.scaleHor( _blk.x );

    const int        sclY   = scale.scaleVer( _blk.y );

    const int        sclW   = scale.scaleHor( _blk.width );

    const int        sclH   = scale.scaleVer( _blk.height );

    // a CU of both channel types covers the same entries in both maps, so a shared map is filled only once

    if( i == CH_L || ctuData.cuPtr[CH_C] != ctuData.cuPtr[CH_L] )

    {

      g_pelBufOP.fillN_CU( ctuData.cuPtr[i] + ( sclX & m_ctuSizeMask[i] ) + ( ( sclY & m_ctuSizeMask[i] ) << m_ctuWidthLog2[i] ), stride, sclW, sclH, cu );

    }

    if( i == chType )

    {

      cu->left   = cuLeft;

      cu->above  = cuAbove;

    }

  }

  cu->setChType( chType );

  if( isLuma( chType ) && unit.lheight() >= 8 && unit.lwidth()  >= 8 && unit.Y().area() >= 128 )

  {

    cu->mvdL0SubPuOff           = ctuData.dmvrMvCacheOffset;

    ctuData.dmvrMvCacheOffset += std::max<int>( 1, unit.lwidth() >> DMVR_SUBCU_WIDTH_LOG2 ) * std::max<int>( 1, unit.lheight() >> DMVR_SUBCU_HEIGHT_LOG2 );

  }

  return *cu;

}

TransformUnit& CodingStructure::addTU( const UnitArea &unit, const ChannelType chType, CodingUnit& cu )

{

  TransformUnit* tu;

  if( cu.firstTU.blocks.empty() )

  {

    tu = cu.lastTU = &cu.firstTU;

  }

  else

  {

    tu = m_tuCache.get();

    memset( NO_WARNING_class_memaccess( tu ), 0, sizeof( TransformUnit ) );

    cu.lastTU->next = tu;

    cu.lastTU       = tu;

  }

  tu->idx               = ++cu.ctuData->numTUs;

  tu->cu                =  &cu;

  tu->setChType         (   chType );

  tu->UnitArea::operator=(  unit );

  return *tu;

}

void CodingStructure::addEmptyTUs( Partitioner &partitioner, CodingUnit& cu )

{

  const bool split = partitioner.canSplit( TU_MAX_TR_SPLIT, *this );

  if( split )

  {

    partitioner.splitCurrArea( TU_MAX_TR_SPLIT, *this );

    do

    {

      addTU( partitioner.currArea(), partitioner.chType, cu );

    } while( partitioner.nextPart( *this ) );

    partitioner.exitCurrSplit( *this );

  }

  else

  {

    addTU( partitioner.currArea(), partitioner.chType, cu );

  }

}

CUTraverser CodingStructure::traverseCUs( const int ctuRsAddr )

{

  CtuData& ctuData = m_ctuData[ctuRsAddr];

  return CUTraverser( ctuData.firstCU, ctuData.lastCU->next );

}

// coding utilities

void CodingStructure::create(const ChromaFormat &_chromaFormat, const Area& _area)

{

  createInternals( UnitArea( _chromaFormat, _area ) );

}

void CodingStructure::create(const UnitArea& _unit)

{

  createInternals( _unit );

}

void CodingStructure::createInternals( const UnitArea& _unit )

{

  area = _unit;

  memcpy( unitScale, UnitScaleArray[area.chromaFormat], sizeof( unitScale ) );

  picture = nullptr;

}

void CodingStructure::rebindPicBufs()

{

  if( !picture->m_bufs[PIC_RECONSTRUCTION].bufs.empty() ) m_reco.createFromBuf( picture->m_bufs[PIC_RECONSTRUCTION] );

  else                                                    m_reco.destroy();

  if( !picture->m_bufs[PIC_RECON_WRAP    ].bufs.empty() ) m_rec_wrap.createFromBuf( picture->m_bufs[PIC_RECON_WRAP] );

  else                                                    m_rec_wrap.destroy();

}

void CodingStructure::allocTempInternals()

{

  const ptrdiff_t ctuCuMapSize    = pcv->num4x4CtuBlks;

  const ptrdiff_t ctuColMiMapSize = pcv->num8x8CtuBlks;

  // m_ctuData may be reallocated below, and initStructData() clears it

  releaseChromaCuMaps();

  // The CU map is only needed while the picture is parsed and reconstructed, so it is borrowed from a cache shared by

  // all pictures. initStructData() clears it. It is one map for both channel types, see separateChromaCuMap().

  const ptrdiff_t newCuMapSize = ctuCuMapSize * pcv->sizeInCtus;

  if( m_cuMapSize != newCuMapSize )

  {

    releaseCuMap();

    m_cuMap     = m_cuMapCache->get( newCuMapSize );

    m_cuMapSize = newCuMapSize;

  }

  const ptrdiff_t newColMiMapSize = ctuColMiMapSize * pcv->sizeInCtus;

  if( m_colMiMapSize != newColMiMapSize )

  {

    m_colMiMap     = std::make_unique<ColocatedMotionInfo[]>( newColMiMapSize );

    m_colMiMapSize = newColMiMapSize;

  }

  const size_t newCtuDataSize = pcv->sizeInCtus;

  if( m_ctuDataSize != newCtuDataSize )

  {

    m_ctuData     = std::make_unique<CtuData[]>( newCtuDataSize );

    m_ctuDataSize = newCtuDataSize;

  }

}

void CodingStructure::deallocTempInternals()

{

  m_cuCache.releaseAll();

  m_tuCache.releaseAll();

  releaseChromaCuMaps();

  releaseCuMap();

}

void CodingStructure::releaseCuMap()

{

  if( m_cuMap )

  {

    m_cuMapCache->cache( std::move( m_cuMap ), m_cuMapSize );

  }

  m_cuMapSize = 0;

}

void CodingStructure::separateChromaCuMap( CtuData& ctuData )

{

  // The CUs added so far cover both channel types, so the chroma map starts as a copy of the luma map.

  // The CTU keeps the plain pointer, releaseChromaCuMaps() gives the map back to the cache.

  CodingUnit** chromaCuMap = m_chromaCuMapCache->get( m_chromaCuMapSize ).release();

  std::copy_n( ctuData.cuPtr[CH_L], m_chromaCuMapSize, chromaCuMap );

  ctuData.cuPtr[CH_C] = chromaCuMap;

}

void CodingStructure::releaseChromaCuMaps()

{

  for( size_t i = 0; i < m_ctuDataSize; i++ )

  {

    CtuData& ctuData = m_ctuData[i];

    if( ctuData.cuPtr[CH_C] != ctuData.cuPtr[CH_L] )

    {

      m_chromaCuMapCache->cache( std::unique_ptr<CodingUnit*[]>( ctuData.cuPtr[CH_C] ), m_chromaCuMapSize );

      ctuData.cuPtr[CH_C] = ctuData.cuPtr[CH_L];

    }

  }

}

void CodingStructure::initStructData()

{

  m_cuCache.releaseAll();

  m_tuCache.releaseAll();

  m_widthInCtus = pcv->widthInCtus;

  m_ctuSizeMask[0] = pcv->maxCUWidthMask >> unitScale[CH_L].posx;

  m_ctuSizeMask[1] = pcv->maxCUWidthMask >> ( getChannelTypeScaleX( CH_C, area.chromaFormat ) + unitScale[CH_C].posx );

  m_ctuWidthLog2[0] = pcv->maxCUWidthLog2 - unitScale[CH_L].posx;

  m_ctuWidthLog2[1] = m_ctuWidthLog2[0]; // same for luma and chroma, because of the 2x2 blocks

  // the separate chroma maps of the previous picture have its CTU size

  releaseChromaCuMaps();

  m_chromaCuMapSize = pcv->num4x4CtuBlks;

  memset( NO_WARNING_class_memaccess( m_ctuData.get() ),             0, sizeof( CtuData             ) * m_ctuDataSize );

  memset( NO_WARNING_class_memaccess( m_cuMap.get() ),               0, sizeof( CodingUnit*         ) * m_cuMapSize );

  memset( NO_WARNING_class_memaccess( m_colMiMap.get() ), CO_NOT_VALID, sizeof( ColocatedMotionInfo ) * m_colMiMapSize );

  const ptrdiff_t ctuSampleSizeL  = pcv->maxCUHeight * pcv->maxCUWidth;

  const ptrdiff_t ctuSampleSizeC  = isChromaEnabled( pcv->chrFormat ) ? ( ctuSampleSizeL >> ( getChannelTypeScaleX( CH_C, pcv->chrFormat) + getChannelTypeScaleY( CH_C, pcv->chrFormat ) ) ) : 0;

  const ptrdiff_t ctuSampleSize   = ctuSampleSizeL + 2 * ctuSampleSizeC;

  const ptrdiff_t ctuCuMapSize    = pcv->num4x4CtuBlks;

  const ptrdiff_t ctuColMiMapSize = pcv->num8x8CtuBlks;

  hasIbcBlock.clear();

  hasIbcBlock.resize( pcv->heightInCtus, 0 );

  for( int y = 0; y < pcv->heightInCtus; y++ )

  {

    for( int x = 0; x < pcv->widthInCtus; x++ )

    {

      int i = y * pcv->widthInCtus + x;

      m_ctuData[i].lineIdx = y;

      m_ctuData[i].colIdx  = x;

      m_ctuData[i].ctuIdx  = i;

      // Both channel types use the same CU map, because a CU of both channel types covers the same entries in the luma

      // and the chroma map. separateChromaCuMap() gives a CTU its own chroma map, if it has a CU of only one channel type.

      m_ctuData[i].cuPtr[CH_L] = &m_cuMap[i * ctuCuMapSize];

      m_ctuData[i].cuPtr[CH_C] = m_ctuData[i].cuPtr[CH_L];

      m_ctuData[i].colMotion         = &m_colMiMap[i * ctuColMiMapSize];

      m_ctuData[i].predBufOffset     = i * ctuSampleSize;

      m_ctuData[i].dmvrMvCacheOffset = i * pcv->num8x8CtuBlks;

    }

  }

}

MotionBuf CodingStructure::getMotionBuf( const Area& _area )

{

  CtuData&        ctuData = getCtuData( ctuRsAddr( _area.pos(), CH_L ) );

  const ptrdiff_t  stride = ptrdiff_t( 1 ) << m_ctuWidthLog2[CH_L];

  const UnitScale  scale  = g_miScaling;

  return MotionBuf( ctuData.motion + inCtuPos( _area, CH_L ), stride, scale.scaleHor( _area.width ), scale.scaleVer( _area.height ) );

}

const CMotionBuf CodingStructure::getMotionBuf( const Area& _area ) const

{

  const CtuData& ctuData  = getCtuData( ctuRsAddr( _area.pos(), CH_L ) );

  const ptrdiff_t  stride = ptrdiff_t( 1 ) << m_ctuWidthLog2[CH_L];

  const UnitScale  scale  = g_miScaling;

  return CMotionBuf( ctuData.motion + inCtuPos( _area, CH_L ), stride, scale.scaleHor( _area.width ), scale.scaleVer( _area.height ) );

}

PelUnitBuf CodingStructure::getPredBuf(const CodingUnit &unit)          

{

  PelUnitBuf ret;

  ret.chromaFormat = unit.chromaFormat;

  ret.bufs.resize_noinit( getNumberValidComponents( unit.chromaFormat ) );

  if( unit.Y().valid() )

  {

    ret.bufs[0].buf    = m_predBuf + unit.predBufOff;

    ret.bufs[0].stride = unit.blocks[0].width;

    ret.bufs[0].width  = unit.blocks[0].width;

    ret.bufs[0].height = unit.blocks[0].height;

  }

  if( isChromaEnabled( unit.chromaFormat ) )

  {

    if( unit.Cb().valid() )

    {

      ret.bufs[1].buf    = m_predBuf + unit.predBufOff + unit.Y().area();

      ret.bufs[1].stride = unit.blocks[1].width;

      ret.bufs[1].width  = unit.blocks[1].width;

      ret.bufs[1].height = unit.blocks[1].height;

    }

    if( unit.Cr().valid() )

    {

      ret.bufs[2].buf    = m_predBuf + unit.predBufOff + unit.Y().area() + unit.Cb().area();

      ret.bufs[2].stride = unit.blocks[2].width;

      ret.bufs[2].width  = unit.blocks[2].width;

      ret.bufs[2].height = unit.blocks[2].height;

    }

  }

  return ret;

}

const CPelUnitBuf CodingStructure::getPredBuf(const CodingUnit &unit) const

{

  CPelUnitBuf ret;

  ret.chromaFormat = unit.chromaFormat;

  ret.bufs.resize( 3 );

  if( unit.Y().valid() )

  {

    ret.bufs[0].buf    = m_predBuf + unit.predBufOff;

    ret.bufs[0].stride = unit.blocks[0].width;

    ret.bufs[0].width  = unit.blocks[0].width;

    ret.bufs[0].height = unit.blocks[0].height;

  }

  if( unit.Cb().valid() )

  {

    ret.bufs[1].buf    = m_predBuf + unit.predBufOff + unit.Y().area();

    ret.bufs[1].stride = unit.blocks[1].width;

    ret.bufs[1].width  = unit.blocks[1].width;

    ret.bufs[1].height = unit.blocks[1].height;

  }

  if( unit.Cr().valid() )

  {

    ret.bufs[2].buf    = m_predBuf + unit.predBufOff + unit.Y().area() + unit.Cb().area();

    ret.bufs[2].stride = unit.blocks[2].width;

    ret.bufs[2].width  = unit.blocks[2].width;

    ret.bufs[2].height = unit.blocks[2].height;

  }

  return ret;

}

const ColocatedMotionInfo& CodingStructure::getColInfo( const Position &pos, const Slice*& pColSlice ) const

{

  const CtuData& ctuData    = getCtuData( ctuRsAddr( pos, CH_L ) );

  const ptrdiff_t rsPos     = colMotPos( pos );

  const ColocatedMotionInfo&

                 colMi      = ctuData.colMotion[rsPos];

                 pColSlice  = ctuData.slice;

  return colMi;

}

const CodingUnit* CodingStructure::getCURestricted( const Position &pos, const CodingUnit& curCu, const ChannelType _chType, const CodingUnit* guess ) const

{

  if( guess && guess->blocks[_chType].contains( pos ) ) return guess;

  const int yshift     = pcv->maxCUWidthLog2 - getChannelTypeScaleY( _chType, curCu.chromaFormat );

  const int ydiff      = ( pos.y >> yshift ) - ( curCu.blocks[_chType].y >> yshift ); // ( a <= b ) ==> a - b <= 0

  const int xshift     = pcv->maxCUWidthLog2 - getChannelTypeScaleX( _chType, curCu.chromaFormat );

  const int xdiff      = ( pos.x >> xshift ) - ( curCu.blocks[_chType].x >> xshift );

  const bool sameCTU   = !ydiff && !xdiff;

  const CodingUnit* cu = nullptr;

  if( sameCTU )

  {

    cu = curCu.ctuData->cuPtr[_chType][inCtuPos( pos, _chType )];

  }

  else if( ydiff > 0 || xdiff > ( 1 - sps->getEntropyCodingSyncEnabledFlag() ) || ( ydiff == 0 && xdiff > 0 ) )

  {

    return nullptr;

  }

  else

  {

    cu = getCU( pos, _chType );

  }

  if( !cu || ( sameCTU && cu->idx > curCu.idx ) ) return nullptr;

  else if( sameCTU ) return cu;

  if( cu->slice->getIndependentSliceIdx() == curCu.slice->getIndependentSliceIdx() && cu->tileIdx == curCu.tileIdx )

  {

    return cu;

  }

  else

  {

    return nullptr;

  }

}

const CodingUnit* CodingStructure::getCURestricted( const Position &pos, const Position curPos, const unsigned curSliceIdx, const unsigned curTileIdx, const ChannelType _chType ) const

{

  const int yshift     = pcv->maxCUWidthLog2 - getChannelTypeScaleY( _chType, area.chromaFormat );

  const int ydiff      = ( pos.y >> yshift ) - ( curPos.y >> yshift ); // ( a <= b ) ==> a - b <= 0

  const int xshift     = pcv->maxCUWidthLog2 - getChannelTypeScaleX( _chType, area.chromaFormat );

  const int xdiff      = ( pos.x >> xshift ) - ( curPos.x >> xshift );

  const bool sameCTU   = !ydiff && !xdiff;

  const CodingUnit* cu = nullptr;

  if( sameCTU )

  {

    return getCU( pos, _chType );

  }

  else if( ydiff > 0 || xdiff > ( 1 - sps->getEntropyCodingSyncEnabledFlag() ) )

  {

    return nullptr;

  }

  else

  {

    cu = getCU( pos, _chType );

  }

  if( cu && cu->slice->getIndependentSliceIdx() == curSliceIdx && cu->tileIdx == curTileIdx )

  {

    return cu;

  }

  else

  {

    return nullptr;

  }

}

void CodingStructure::initVIbcBuf( int numCtuLines, ChromaFormat chromaFormatIDC, int ctuSize )

{

  m_virtualIBCbuf.resize( numCtuLines );

  for( auto& buf: m_virtualIBCbuf )

  {

    if( buf.bufs.empty() || m_IBCBufferWidth != g_IBCBufferSize / ctuSize )

    {

      m_IBCBufferWidth = g_IBCBufferSize / ctuSize;

      buf.destroy();

      buf.create( UnitArea( chromaFormatIDC, Area( 0, 0, m_IBCBufferWidth, ctuSize ) ) );

    }

  }

}

void CodingStructure::fillIBCbuffer( CodingUnit &cu, int lineIdx )

{

  for( const CompArea &area : cu.blocks )

  {

    if (!area.valid())

      continue;

    const unsigned int lcuWidth = sps->getMaxCUWidth();

    const int shiftSampleHor = getComponentScaleX(area.compID(), cu.chromaFormat);

    const int shiftSampleVer = getComponentScaleY(area.compID(), cu.chromaFormat);

    const int ctuSizeVerLog2 = getLog2(lcuWidth) - shiftSampleVer;

    const int pux = area.x & ((m_IBCBufferWidth >> shiftSampleHor) - 1);

    const int puy = area.y & (( 1 << ctuSizeVerLog2 ) - 1);

    const CompArea dstArea = CompArea(area.compID(), Position(pux, puy), Size(area.width, area.height));

    CPelBuf srcBuf = getRecoBuf(area);

    PelBuf dstBuf = m_virtualIBCbuf[lineIdx].getBuf(dstArea);

    dstBuf.copyFrom(srcBuf);

  }

}

}