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/** \file     Unit.cpp
 *  \brief    defines unit as a set of blocks and basic unit types (coding, prediction, transform)
 */

#include "Unit.h"

#include "Buffer.h"
#include "Picture.h"
#include "ChromaFormat.h"

#include "UnitTools.h"
#include "UnitPartitioner.h"

namespace vvdec
{

 // ---------------------------------------------------------------------------
 // block method definitions
 // ---------------------------------------------------------------------------

Position CompArea::chromaPos( const ChromaFormat chromaFormat ) const
{
  if (isLuma(compID()))
  {
    uint32_t scaleX = getComponentScaleX(compID(), chromaFormat);
    uint32_t scaleY = getComponentScaleY(compID(), chromaFormat);

    return Position(x >> scaleX, y >> scaleY);
  }
  else
  {
    return *this;
  }
}

Size CompArea::lumaSize( const ChromaFormat chromaFormat ) const
{
  if( isChroma( compID() ) )
  {
    uint32_t scaleX = getComponentScaleX( compID(), chromaFormat );
    uint32_t scaleY = getComponentScaleY( compID(), chromaFormat );

    return Size( width << scaleX, height << scaleY );
  }
  else
  {
    return *this;
  }
}

Size CompArea::chromaSize( const ChromaFormat chromaFormat ) const
{
  if( isLuma( compID() ) )
  {
    uint32_t scaleX = getComponentScaleX( compID(), chromaFormat );
    uint32_t scaleY = getComponentScaleY( compID(), chromaFormat );

    return Size( width >> scaleX, height >> scaleY );
  }
  else
  {
    return *this;
  }
}

Position CompArea::lumaPos( const ChromaFormat chromaFormat ) const
{
  if( isChroma( compID() ) )
  {
    uint32_t scaleX = getComponentScaleX( compID(), chromaFormat );
    uint32_t scaleY = getComponentScaleY( compID(), chromaFormat );

    return Position( x << scaleX, y << scaleY );
  }
  else
  {
    return *this;
  }
}

Position CompArea::compPos( const ChromaFormat chromaFormat, const ComponentID compID ) const
{
  return isLuma( compID ) ? lumaPos( chromaFormat ) : chromaPos( chromaFormat );
}

Position CompArea::chanPos( const ChromaFormat chromaFormat, const ChannelType chType ) const
{
  return isLuma( chType ) ? lumaPos( chromaFormat ) : chromaPos( chromaFormat );
}

// ---------------------------------------------------------------------------
// unit method definitions
// ---------------------------------------------------------------------------

UnitArea::UnitArea(const ChromaFormat _chromaFormat) : chromaFormat(_chromaFormat) { }

UnitArea::UnitArea(const ChromaFormat _chromaFormat, const Area &_area) : chromaFormat(_chromaFormat)
{
  const uint32_t numCh = getNumberValidComponents( chromaFormat );

  blocks.resize_noinit( numCh );

  if( !numCh ) return;

  blocks[0]._compID      = COMPONENT_Y;
  blocks[0].x            = _area.x;
  blocks[0].y            = _area.y;
  blocks[0].width        = _area.width;
  blocks[0].height       = _area.height;

  if( numCh == 1 ) return;

  const int csx = getChannelTypeScaleX( CH_C, chromaFormat );
  const int csy = getChannelTypeScaleY( CH_C, chromaFormat );
  
  blocks[1]._compID      = COMPONENT_Cb;
  blocks[2]._compID      = COMPONENT_Cr;
  blocks[1].x            = blocks[2].x            = ( _area.x >> csx );
  blocks[1].y            = blocks[2].y            = ( _area.y >> csy );
  blocks[1].width        = blocks[2].width        = ( _area.width  >> csx );
  blocks[1].height       = blocks[2].height       = ( _area.height >> csy );
}

UnitArea::UnitArea(const ChromaFormat _chromaFormat, const CompArea &blkY) : chromaFormat(_chromaFormat), blocks { blkY } {}

UnitArea::UnitArea(const ChromaFormat _chromaFormat,       CompArea &&blkY) : chromaFormat(_chromaFormat), blocks { std::forward<CompArea>(blkY) } {}

UnitArea::UnitArea(const ChromaFormat _chromaFormat, const CompArea &blkY, const CompArea &blkCb, const CompArea &blkCr)  : chromaFormat(_chromaFormat), blocks { blkY, blkCb, blkCr } {}

UnitArea::UnitArea(const ChromaFormat _chromaFormat,       CompArea &&blkY,      CompArea &&blkCb,      CompArea &&blkCr) : chromaFormat(_chromaFormat), blocks { std::forward<CompArea>(blkY), std::forward<CompArea>(blkCb), std::forward<CompArea>(blkCr) } {}

bool UnitArea::contains(const UnitArea& other) const
{
  bool any = false;

  if( blocks[0].valid() && other.blocks[0].valid() )
  {
    any = true;
    if( !blocks[0].contains( other.blocks[0] ) ) return false;
  }

  if( blocks[1].valid() && other.blocks[1].valid() )
  {
    any = true;
    if( !blocks[1].contains( other.blocks[1] ) ) return false;
  }

  if( blocks[2].valid() && other.blocks[2].valid() )
  {
    any = true;
    if( !blocks[2].contains( other.blocks[2] ) ) return false;
  }

  return any;
}

bool UnitArea::contains( const UnitArea& other, const ChannelType chType ) const
{
  if( chType == CH_L && blocks[0].valid() && other.blocks[0].valid() )
  {
    if( !blocks[0].contains( other.blocks[0] ) ) return false;
    return true;
  }

  if( chType == CH_L ) return false;

  bool any = false;

  if( blocks[1].valid() && other.blocks[1].valid() )
  {
    any = true;
    if( !blocks[1].contains( other.blocks[1] ) ) return false;
  }

  if( blocks[2].valid() && other.blocks[2].valid() )
  {
    any = true;
    if( !blocks[2].contains( other.blocks[2] ) ) return false;
  }

  return any;
}

void UnitArea::repositionTo(const UnitArea& unitArea)
{
  for(uint32_t i = 0; i < blocks.size(); i++)
  {
    blocks[i].repositionTo(unitArea.blocks[i]);
  }
}

const UnitArea UnitArea::singleComp(const ComponentID compID) const
{
  UnitArea ret = *this;

  for( auto &blk : ret.blocks )
  {
    if( blk.compID() != compID )
    {
      new ( &blk ) CompArea();
    }
  }

  return ret;
}

const UnitArea UnitArea::singleChan(const ChannelType chType) const
{
#if 1
  UnitArea ret(chromaFormat);

  for (const auto &blk : blocks)
  {
    if (toChannelType( blk.compID() ) == chType)
    {
      ret.blocks.push_back(blk);
    }
    else
    {
      ret.blocks.push_back(CompArea());
    }
  }
#else
  UnitArea ret = *this;

  for( auto &blk : ret.blocks )
  {
    if( toChannelType( blk.compID ) != chType )
    {
      new ( &blk ) CompArea();
    }
  }
#endif
  return ret;
}

// ---------------------------------------------------------------------------
// coding unit method definitions
// ---------------------------------------------------------------------------

void CodingUnit::minInit( const UnitArea &unit )
{
  static_cast<UnitArea &>( *this ) = unit;

  intraDir[0] = DC_IDX;

  refIdx[0]   = refIdx[1] = -1;
}

// ---------------------------------------------------------------------------
// prediction unit method definitions
// ---------------------------------------------------------------------------

CodingUnit& CodingUnit::operator=( const MotionInfo& mi )
{
  setInterDir( mi.interDir() );

  for( uint32_t i = 0; i < NUM_REF_PIC_LIST_01; i++ )
  {
    refIdx[i] = mi.miRefIdx[i];
    mv [i][0] = mi.mv      [i];
  }

  return *this;
}

const MotionInfo& CodingUnit::getMotionInfo() const
{
  return ctuData->motion[cs->inCtuPos( lumaPos(), CH_L )];
}

const MotionInfo& CodingUnit::getMotionInfo( const Position& pos ) const
{
  CHECKD( !Y().contains( pos ), "Trying to access motion info outsied of PU" );
  return ctuData->motion[cs->inCtuPos( pos, CH_L )];
}

MotionBuf CodingUnit::getMotionBuf()
{
  return MotionBuf( &ctuData->motion[cs->inCtuPos( lumaPos(), CH_L )], cs->get4x4MapStride(), g_miScaling.scaleHor( lwidth() ), g_miScaling.scaleVer( lheight() ) );
}

CMotionBuf CodingUnit::getMotionBuf() const
{
  return CMotionBuf( &getMotionInfo(), cs->get4x4MapStride(), g_miScaling.scaleHor( lwidth() ), g_miScaling.scaleVer( lheight() ) );
}

}