Picture.cpp

/* The copyright in this software is being made available under the BSD
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* granted under this license.
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*    this list of conditions and the following disclaimer.
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/** \file     Picture.cpp
 *  \brief    Description of a coded picture
 */

#include "Picture.h"
#include "SEI.h"
#include "ChromaFormat.h"
#include "CommonLib/InterpolationFilter.h"


#if ENABLE_SPLIT_PARALLELISM

int g_wppThreadId( 0 );
#pragma omp threadprivate(g_wppThreadId)

#if ENABLE_SPLIT_PARALLELISM
int g_splitThreadId( 0 );
#pragma omp threadprivate(g_splitThreadId)

int g_splitJobId( 0 );
#pragma omp threadprivate(g_splitJobId)
#endif

Scheduler::Scheduler() :
#if ENABLE_SPLIT_PARALLELISM
  m_numSplitThreads( 1 )
#endif
{
}

Scheduler::~Scheduler()
{
}

#if ENABLE_SPLIT_PARALLELISM
unsigned Scheduler::getSplitDataId( int jobId ) const
{
  if( m_numSplitThreads > 1 && m_hasParallelBuffer )
  {
    int splitJobId = jobId == CURR_THREAD_ID ? g_splitJobId : jobId;

    return ( g_wppThreadId * NUM_RESERVERD_SPLIT_JOBS ) + splitJobId;
  }
  else
  {
    return 0;
  }
}

unsigned Scheduler::getSplitPicId( int tId /*= CURR_THREAD_ID */ ) const
{
  if( m_numSplitThreads > 1 && m_hasParallelBuffer )
  {
    int threadId = tId == CURR_THREAD_ID ? g_splitThreadId : tId;

    return ( g_wppThreadId * m_numSplitThreads ) + threadId;
  }
  else
  {
    return 0;
  }
}

unsigned Scheduler::getSplitJobId() const
{
  if( m_numSplitThreads > 1 )
  {
    return g_splitJobId;
  }
  else
  {
    return 0;
  }
}

void Scheduler::setSplitJobId( const int jobId )
{
  CHECK( g_splitJobId != 0 && jobId != 0, "Need to reset the jobId after usage!" );
  g_splitJobId = jobId;
}

void Scheduler::startParallel()
{
  m_hasParallelBuffer = true;
}

void Scheduler::finishParallel()
{
  m_hasParallelBuffer = false;
}

void Scheduler::setSplitThreadId( const int tId )
{
  g_splitThreadId = tId == CURR_THREAD_ID ? omp_get_thread_num() : tId;
}

#endif



unsigned Scheduler::getDataId() const
{
#if ENABLE_SPLIT_PARALLELISM
  if( m_numSplitThreads > 1 )
  {
    return getSplitDataId();
  }
#endif
  return 0;
}

bool Scheduler::init( const int ctuYsize, const int ctuXsize, const int numWppThreadsRunning, const int numWppExtraLines, const int numSplitThreads )
{
#if ENABLE_SPLIT_PARALLELISM
  m_numSplitThreads = numSplitThreads;
#endif

  return true;
}


int Scheduler::getNumPicInstances() const
{
#if !ENABLE_SPLIT_PARALLELISM
  return 1;
#else
  return ( m_numSplitThreads > 1 ? m_numSplitThreads : 1 );
#endif
}

#endif


// ---------------------------------------------------------------------------
// picture methods
// ---------------------------------------------------------------------------



Picture::Picture()
{
  cs                   = nullptr;
  m_isSubPicBorderSaved = false;
  m_bIsBorderExtended  = false;
#if JVET_Q0764_WRAP_AROUND_WITH_RPR
  m_wrapAroundValid    = false;
  m_wrapAroundOffset   = 0;
#endif
  usedByCurr           = false;
  longTerm             = false;
  reconstructed        = false;
  neededForOutput      = false;
  referenced           = false;
  layer                = std::numeric_limits<uint32_t>::max();
  fieldPic             = false;
  topField             = false;
  precedingDRAP        = false;
  for( int i = 0; i < MAX_NUM_CHANNEL_TYPE; i++ )
  {
    m_prevQP[i] = -1;
  }
  m_spliceIdx = NULL;
  m_ctuNums = 0;
  layerId = NOT_VALID;
}

void Picture::create( const ChromaFormat &_chromaFormat, const Size &size, const unsigned _maxCUSize, const unsigned _margin, const bool _decoder, const int _layerId )
{
  layerId = _layerId;
  UnitArea::operator=( UnitArea( _chromaFormat, Area( Position{ 0, 0 }, size ) ) );
  margin            =  MAX_SCALING_RATIO*_margin;
  const Area a      = Area( Position(), size );
  M_BUFS( 0, PIC_RECONSTRUCTION ).create( _chromaFormat, a, _maxCUSize, margin, MEMORY_ALIGN_DEF_SIZE );
  M_BUFS( 0, PIC_RECON_WRAP ).create( _chromaFormat, a, _maxCUSize, margin, MEMORY_ALIGN_DEF_SIZE );

  if( !_decoder )
  {
    M_BUFS( 0, PIC_ORIGINAL ).    create( _chromaFormat, a );
    M_BUFS( 0, PIC_TRUE_ORIGINAL ). create( _chromaFormat, a );
  }
#if !KEEP_PRED_AND_RESI_SIGNALS

  m_ctuArea = UnitArea( _chromaFormat, Area( Position{ 0, 0 }, Size( _maxCUSize, _maxCUSize ) ) );
#endif
  m_hashMap.clearAll();
}

void Picture::destroy()
{
#if ENABLE_SPLIT_PARALLELISM
  for( int jId = 0; jId < PARL_SPLIT_MAX_NUM_THREADS; jId++ )
#endif
  for (uint32_t t = 0; t < NUM_PIC_TYPES; t++)
  {
    M_BUFS( jId, t ).destroy();
  }
  m_hashMap.clearAll();
  if( cs )
  {
    cs->destroy();
    delete cs;
    cs = nullptr;
  }

  for( auto &ps : slices )
  {
    delete ps;
  }
  slices.clear();

  for( auto &psei : SEIs )
  {
    delete psei;
  }
  SEIs.clear();

  if (m_spliceIdx)
  {
    delete[] m_spliceIdx;
    m_spliceIdx = NULL;
  }
}

void Picture::createTempBuffers( const unsigned _maxCUSize )
{
#if KEEP_PRED_AND_RESI_SIGNALS
  const Area a( Position{ 0, 0 }, lumaSize() );
#else
  const Area a = m_ctuArea.Y();
#endif

#if ENABLE_SPLIT_PARALLELISM
  scheduler.startParallel();

  for( int jId = 0; jId < scheduler.getNumPicInstances(); jId++ )
#endif
  {
    M_BUFS( jId, PIC_PREDICTION                   ).create( chromaFormat, a,   _maxCUSize );
    M_BUFS( jId, PIC_RESIDUAL                     ).create( chromaFormat, a,   _maxCUSize );
#if ENABLE_SPLIT_PARALLELISM
    if( jId > 0 ) M_BUFS( jId, PIC_RECONSTRUCTION ).create( chromaFormat, Y(), _maxCUSize, margin, MEMORY_ALIGN_DEF_SIZE );
#endif
  }

  if( cs ) cs->rebindPicBufs();
}

void Picture::destroyTempBuffers()
{
#if ENABLE_SPLIT_PARALLELISM
  scheduler.finishParallel();

  for( int jId = 0; jId < scheduler.getNumPicInstances(); jId++ )
#endif
  for( uint32_t t = 0; t < NUM_PIC_TYPES; t++ )
  {
    if( t == PIC_RESIDUAL || t == PIC_PREDICTION ) M_BUFS( jId, t ).destroy();
#if ENABLE_SPLIT_PARALLELISM
    if( t == PIC_RECONSTRUCTION &&       jId > 0 ) M_BUFS( jId, t ).destroy();
#endif
  }

  if( cs ) cs->rebindPicBufs();
}

       PelBuf     Picture::getOrigBuf(const CompArea &blk)        { return getBuf(blk,  PIC_ORIGINAL); }
const CPelBuf     Picture::getOrigBuf(const CompArea &blk)  const { return getBuf(blk,  PIC_ORIGINAL); }
       PelUnitBuf Picture::getOrigBuf(const UnitArea &unit)       { return getBuf(unit, PIC_ORIGINAL); }
const CPelUnitBuf Picture::getOrigBuf(const UnitArea &unit) const { return getBuf(unit, PIC_ORIGINAL); }
       PelUnitBuf Picture::getOrigBuf()                           { return M_BUFS(0,    PIC_ORIGINAL); }
const CPelUnitBuf Picture::getOrigBuf()                     const { return M_BUFS(0,    PIC_ORIGINAL); }

       PelBuf     Picture::getOrigBuf(const ComponentID compID)       { return getBuf(compID, PIC_ORIGINAL); }
const CPelBuf     Picture::getOrigBuf(const ComponentID compID) const { return getBuf(compID, PIC_ORIGINAL); }
       PelUnitBuf Picture::getTrueOrigBuf()                           { return M_BUFS(0, PIC_TRUE_ORIGINAL); }
const CPelUnitBuf Picture::getTrueOrigBuf()                     const { return M_BUFS(0, PIC_TRUE_ORIGINAL); }
       PelBuf     Picture::getTrueOrigBuf(const CompArea &blk)        { return getBuf(blk, PIC_TRUE_ORIGINAL); }
const CPelBuf     Picture::getTrueOrigBuf(const CompArea &blk)  const { return getBuf(blk, PIC_TRUE_ORIGINAL); }
       PelBuf     Picture::getPredBuf(const CompArea &blk)        { return getBuf(blk,  PIC_PREDICTION); }
const CPelBuf     Picture::getPredBuf(const CompArea &blk)  const { return getBuf(blk,  PIC_PREDICTION); }
       PelUnitBuf Picture::getPredBuf(const UnitArea &unit)       { return getBuf(unit, PIC_PREDICTION); }
const CPelUnitBuf Picture::getPredBuf(const UnitArea &unit) const { return getBuf(unit, PIC_PREDICTION); }

       PelBuf     Picture::getResiBuf(const CompArea &blk)        { return getBuf(blk,  PIC_RESIDUAL); }
const CPelBuf     Picture::getResiBuf(const CompArea &blk)  const { return getBuf(blk,  PIC_RESIDUAL); }
       PelUnitBuf Picture::getResiBuf(const UnitArea &unit)       { return getBuf(unit, PIC_RESIDUAL); }
const CPelUnitBuf Picture::getResiBuf(const UnitArea &unit) const { return getBuf(unit, PIC_RESIDUAL); }

       PelBuf     Picture::getRecoBuf(const ComponentID compID, bool wrap)       { return getBuf(compID,                    wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
const CPelBuf     Picture::getRecoBuf(const ComponentID compID, bool wrap) const { return getBuf(compID,                    wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
       PelBuf     Picture::getRecoBuf(const CompArea &blk, bool wrap)            { return getBuf(blk,                       wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
const CPelBuf     Picture::getRecoBuf(const CompArea &blk, bool wrap)      const { return getBuf(blk,                       wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
       PelUnitBuf Picture::getRecoBuf(const UnitArea &unit, bool wrap)           { return getBuf(unit,                      wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
const CPelUnitBuf Picture::getRecoBuf(const UnitArea &unit, bool wrap)     const { return getBuf(unit,                      wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
       PelUnitBuf Picture::getRecoBuf(bool wrap)                                 { return M_BUFS(scheduler.getSplitPicId(), wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }
const CPelUnitBuf Picture::getRecoBuf(bool wrap)                           const { return M_BUFS(scheduler.getSplitPicId(), wrap ? PIC_RECON_WRAP : PIC_RECONSTRUCTION); }

void Picture::finalInit( const VPS* vps, const SPS& sps, const PPS& pps, PicHeader *picHeader, APS** alfApss, APS* lmcsAps, APS* scalingListAps )
{
  for( auto &sei : SEIs )
  {
    delete sei;
  }
  SEIs.clear();
  clearSliceBuffer();


  const ChromaFormat chromaFormatIDC = sps.getChromaFormatIdc();
  const int          iWidth = pps.getPicWidthInLumaSamples();
  const int          iHeight = pps.getPicHeightInLumaSamples();

  if( cs )
  {
    cs->initStructData();
  }
  else
  {
    cs = new CodingStructure( g_globalUnitCache.cuCache, g_globalUnitCache.puCache, g_globalUnitCache.tuCache );
    cs->sps = &sps;
    cs->create(chromaFormatIDC, Area(0, 0, iWidth, iHeight), true, (bool)sps.getPLTMode());
  }

  cs->vps = vps;
  cs->picture = this;
  cs->slice   = nullptr;  // the slices for this picture have not been set at this point. update cs->slice after swapSliceObject()
  cs->pps     = &pps;
  picHeader->setSPSId( sps.getSPSId() );
  picHeader->setPPSId( pps.getPPSId() );
  cs->picHeader = picHeader;
  memcpy(cs->alfApss, alfApss, sizeof(cs->alfApss));
  cs->lmcsAps = lmcsAps;
  cs->scalinglistAps = scalingListAps;
  cs->pcv     = pps.pcv;
  m_conformanceWindow = pps.getConformanceWindow();
  m_scalingWindow = pps.getScalingWindow();

  if (m_spliceIdx == NULL)
  {
    m_ctuNums = cs->pcv->sizeInCtus;
    m_spliceIdx = new int[m_ctuNums];
    memset(m_spliceIdx, 0, m_ctuNums * sizeof(int));
  }
}

void Picture::allocateNewSlice()
{
  slices.push_back(new Slice);
  Slice& slice = *slices.back();
  memcpy(slice.getAlfAPSs(), cs->alfApss, sizeof(cs->alfApss));


  slice.setPPS( cs->pps);
  slice.setSPS( cs->sps);
  slice.setVPS( cs->vps);
  if(slices.size()>=2)
  {
    slice.copySliceInfo( slices[slices.size()-2] );
    slice.initSlice();
  }
}

Slice *Picture::swapSliceObject(Slice * p, uint32_t i)
{
  p->setSPS(cs->sps);
  p->setPPS(cs->pps);
  p->setVPS(cs->vps);
  p->setAlfAPSs(cs->alfApss);


  Slice * pTmp = slices[i];
  slices[i] = p;
  pTmp->setSPS(0);
  pTmp->setPPS(0);
  pTmp->setVPS(0);
  memset(pTmp->getAlfAPSs(), 0, sizeof(*pTmp->getAlfAPSs())*ALF_CTB_MAX_NUM_APS);

  return pTmp;
}

void Picture::clearSliceBuffer()
{
  for (uint32_t i = 0; i < uint32_t(slices.size()); i++)
  {
    delete slices[i];
  }
  slices.clear();
}

#if ENABLE_SPLIT_PARALLELISM

void Picture::finishParallelPart( const UnitArea& area )
{
  const UnitArea clipdArea = clipArea( area, *this );
  const int      sourceID  = scheduler.getSplitPicId( 0 );
  CHECK( scheduler.getSplitJobId() > 0, "Finish-CU cannot be called from within a mode- or split-parallelized block!" );

  // distribute the reconstruction across all of the parallel workers
  for( int tId = 1; tId < scheduler.getNumSplitThreads(); tId++ )
  {
    const int destID = scheduler.getSplitPicId( tId );

    M_BUFS( destID, PIC_RECONSTRUCTION ).subBuf( clipdArea ).copyFrom( M_BUFS( sourceID, PIC_RECONSTRUCTION ).subBuf( clipdArea ) );
  }
}


#endif

const TFilterCoeff DownsamplingFilterSRC[8][16][12] =
{
    { // D = 1
      {   0,   0,   0,   0,   0, 128,   0,   0,   0,   0,   0,   0 },
      {   0,   0,   0,   2,  -6, 127,   7,  -2,   0,   0,   0,   0 },
      {   0,   0,   0,   3, -12, 125,  16,  -5,   1,   0,   0,   0 },
      {   0,   0,   0,   4, -16, 120,  26,  -7,   1,   0,   0,   0 },
      {   0,   0,   0,   5, -18, 114,  36, -10,   1,   0,   0,   0 },
      {   0,   0,   0,   5, -20, 107,  46, -12,   2,   0,   0,   0 },
      {   0,   0,   0,   5, -21,  99,  57, -15,   3,   0,   0,   0 },
      {   0,   0,   0,   5, -20,  89,  68, -18,   4,   0,   0,   0 },
      {   0,   0,   0,   4, -19,  79,  79, -19,   4,   0,   0,   0 },
      {   0,   0,   0,   4, -18,  68,  89, -20,   5,   0,   0,   0 },
      {   0,   0,   0,   3, -15,  57,  99, -21,   5,   0,   0,   0 },
      {   0,   0,   0,   2, -12,  46, 107, -20,   5,   0,   0,   0 },
      {   0,   0,   0,   1, -10,  36, 114, -18,   5,   0,   0,   0 },
      {   0,   0,   0,   1,  -7,  26, 120, -16,   4,   0,   0,   0 },
      {   0,   0,   0,   1,  -5,  16, 125, -12,   3,   0,   0,   0 },
      {   0,   0,   0,   0,  -2,   7, 127,  -6,   2,   0,   0,   0 }
    },
    { // D = 1.5
      {   0,   2,   0, -14,  33,  86,  33, -14,   0,   2,   0,   0 },
      {   0,   1,   1, -14,  29,  85,  38, -13,  -1,   2,   0,   0 },
      {   0,   1,   2, -14,  24,  84,  43, -12,  -2,   2,   0,   0 },
      {   0,   1,   2, -13,  19,  83,  48, -11,  -3,   2,   0,   0 },
      {   0,   0,   3, -13,  15,  81,  53, -10,  -4,   3,   0,   0 },
      {   0,   0,   3, -12,  11,  79,  57,  -8,  -5,   3,   0,   0 },
      {   0,   0,   3, -11,   7,  76,  62,  -5,  -7,   3,   0,   0 },
      {   0,   0,   3, -10,   3,  73,  65,  -2,  -7,   3,   0,   0 },
      {   0,   0,   3,  -9,   0,  70,  70,   0,  -9,   3,   0,   0 },
      {   0,   0,   3,  -7,  -2,  65,  73,   3, -10,   3,   0,   0 },
      {   0,   0,   3,  -7,  -5,  62,  76,   7, -11,   3,   0,   0 },
      {   0,   0,   3,  -5,  -8,  57,  79,  11, -12,   3,   0,   0 },
      {   0,   0,   3,  -4, -10,  53,  81,  15, -13,   3,   0,   0 },
      {   0,   0,   2,  -3, -11,  48,  83,  19, -13,   2,   1,   0 },
      {   0,   0,   2,  -2, -12,  43,  84,  24, -14,   2,   1,   0 },
      {   0,   0,   2,  -1, -13,  38,  85,  29, -14,   1,   1,   0 }
    },
    { // D = 2
      {   0,   5,   -6,  -10,  37,  76,   37,  -10,  -6,    5,  0,   0}, //0
      {   0,   5,   -4,  -11,  33,  76,   40,  -9,    -7,    5,  0,   0}, //1
      //{   0,   5,   -3,  -12,  28,  75,   44,  -7,    -8,    5,  1,   0}, //2
      {  -1,   5,   -3,  -12,  29,  75,   45,  -7,    -8,   5,  0,   0}, //2 new coefficients in m24499
      {  -1,   4,   -2,  -13,  25,  75,   48,  -5,    -9,    5,  1,   0}, //3
      {  -1,   4,   -1,  -13,  22,  73,   52,  -3,    -10,  4,  1,   0}, //4
      {  -1,   4,   0,    -13,  18,  72,   55,  -1,    -11,  4,  2,  -1}, //5
      {  -1,   4,   1,    -13,  14,  70,   59,  2,    -12,  3,  2,  -1}, //6
      {  -1,   3,   1,    -13,  11,  68,   62,  5,    -12,  3,  2,  -1}, //7
      {  -1,   3,   2,    -13,  8,  65,   65,  8,    -13,  2,  3,  -1}, //8
      {  -1,   2,   3,    -12,  5,  62,   68,  11,    -13,  1,  3,  -1}, //9
      {  -1,   2,   3,    -12,  2,  59,   70,  14,    -13,  1,  4,  -1}, //10
      {  -1,   2,   4,    -11,  -1,  55,   72,  18,    -13,  0,  4,  -1}, //11
      {   0,   1,   4,    -10,  -3,  52,   73,  22,    -13,  -1,  4,  -1}, //12
      {   0,   1,   5,    -9,    -5,  48,   75,  25,    -13,  -2,  4,  -1}, //13
      //{   0,   1,   5,    -8,    -7,  44,   75,  28,    -12,  -3,  5,   0}, //14
      {    0,   0,   5,    -8,   -7,  45,   75,  29,    -12,  -3,  5,  -1}  , //14 new coefficients in m24499
      {   0,   0,   5,    -7,    -9,  40,   76,  33,    -11,  -4,  5,   0}, //15
    },
    { // D = 2.5
      {   2,  -3,   -9,  6,   39,  58,   39,  6,   -9,  -3,    2,    0}, // 0
      {   2,  -3,   -9,  4,   38,  58,   43,  7,   -9,  -4,    1,    0}, // 1
      {   2,  -2,   -9,  2,   35,  58,   44,  9,   -8,  -4,    1,    0}, // 2
      {   1,  -2,   -9,  1,   34,  58,   46,  11,   -8,  -5,    1,    0}, // 3
      //{   1,  -1,   -8,  -1,   31,  57,   48,  13,   -8,  -5,    1,    0}, // 4
      {   1,  -1,   -8,  -1,   31,  57,   47,  13,   -7,  -5,    1,    0},  // 4 new coefficients in m24499
      {   1,  -1,   -8,  -2,   29,  56,   49,  15,   -7,  -6,    1,    1}, // 5
      {   1,  0,   -8,  -3,   26,  55,   51,  17,   -7,  -6,    1,    1}, // 6
      {   1,  0,   -7,  -4,   24,  54,   52,  19,   -6,  -7,    1,    1}, // 7
      {   1,  0,   -7,  -5,   22,  53,   53,  22,   -5,  -7,    0,    1}, // 8
      {   1,  1,   -7,  -6,   19,  52,   54,  24,   -4,  -7,    0,    1}, // 9
      {   1,  1,   -6,  -7,   17,  51,   55,  26,   -3,  -8,    0,    1}, // 10
      {   1,  1,   -6,  -7,   15,  49,   56,  29,   -2,  -8,    -1,    1}, // 11
      //{   0,  1,   -5,  -8,   13,  48,   57,  31,   -1,  -8,    -1,    1}, // 12 new coefficients in m24499
      {   0,  1,   -5,  -7,   13,  47,  57,  31,  -1,    -8,   -1,    1}, // 12
      {   0,  1,   -5,  -8,   11,  46,   58,  34,   1,    -9,    -2,    1}, // 13
      {   0,  1,   -4,  -8,   9,    44,   58,  35,   2,    -9,    -2,    2}, // 14
      {   0,  1,   -4,  -9,   7,    43,   58,  38,   4,    -9,    -3,    2}, // 15
    },
    { // D = 3
      {  -2,  -7,   0,  17,  35,  43,  35,  17,   0,  -7,  -5,   2 },
      {  -2,  -7,  -1,  16,  34,  43,  36,  18,   1,  -7,  -5,   2 },
      {  -1,  -7,  -1,  14,  33,  43,  36,  19,   1,  -6,  -5,   2 },
      {  -1,  -7,  -2,  13,  32,  42,  37,  20,   3,  -6,  -5,   2 },
      {   0,  -7,  -3,  12,  31,  42,  38,  21,   3,  -6,  -5,   2 },
      {   0,  -7,  -3,  11,  30,  42,  39,  23,   4,  -6,  -6,   1 },
      {   0,  -7,  -4,  10,  29,  42,  40,  24,   5,  -6,  -6,   1 },
      {   1,  -7,  -4,   9,  27,  41,  40,  25,   6,  -5,  -6,   1 },
      {   1,  -6,  -5,   7,  26,  41,  41,  26,   7,  -5,  -6,   1 },
      {   1,  -6,  -5,   6,  25,  40,  41,  27,   9,  -4,  -7,   1 },
      {   1,  -6,  -6,   5,  24,  40,  42,  29,  10,  -4,  -7,   0 },
      {   1,  -6,  -6,   4,  23,  39,  42,  30,  11,  -3,  -7,   0 },
      {   2,  -5,  -6,   3,  21,  38,  42,  31,  12,  -3,  -7,   0 },
      {   2,  -5,  -6,   3,  20,  37,  42,  32,  13,  -2,  -7,  -1 },
      {   2,  -5,  -6,   1,  19,  36,  43,  33,  14,  -1,  -7,  -1 },
      {   2,  -5,  -7,   1,  18,  36,  43,  34,  16,  -1,  -7,  -2 }
    },
    { // D = 3.5
      {  -6,  -3,   5,  19,  31,  36,  31,  19,   5,  -3,  -6,   0 },
      {  -6,  -4,   4,  18,  31,  37,  32,  20,   6,  -3,  -6,  -1 },
      {  -6,  -4,   4,  17,  30,  36,  33,  21,   7,  -3,  -6,  -1 },
      {  -5,  -5,   3,  16,  30,  36,  33,  22,   8,  -2,  -6,  -2 },
      {  -5,  -5,   2,  15,  29,  36,  34,  23,   9,  -2,  -6,  -2 },
      {  -5,  -5,   2,  15,  28,  36,  34,  24,  10,  -2,  -6,  -3 },
      {  -4,  -5,   1,  14,  27,  36,  35,  24,  10,  -1,  -6,  -3 },
      {  -4,  -5,   0,  13,  26,  35,  35,  25,  11,   0,  -5,  -3 },
      {  -4,  -6,   0,  12,  26,  36,  36,  26,  12,   0,  -6,  -4 },
      {  -3,  -5,   0,  11,  25,  35,  35,  26,  13,   0,  -5,  -4 },
      {  -3,  -6,  -1,  10,  24,  35,  36,  27,  14,   1,  -5,  -4 },
      {  -3,  -6,  -2,  10,  24,  34,  36,  28,  15,   2,  -5,  -5 },
      {  -2,  -6,  -2,   9,  23,  34,  36,  29,  15,   2,  -5,  -5 },
      {  -2,  -6,  -2,   8,  22,  33,  36,  30,  16,   3,  -5,  -5 },
      {  -1,  -6,  -3,   7,  21,  33,  36,  30,  17,   4,  -4,  -6 },
      {  -1,  -6,  -3,   6,  20,  32,  37,  31,  18,   4,  -4,  -6 }
    },
    { // D = 4
      {  -9,   0,   9,  20,  28,  32,  28,  20,   9,   0,  -9,   0 },
      {  -9,   0,   8,  19,  28,  32,  29,  20,  10,   0,  -4,  -5 },
      {  -9,  -1,   8,  18,  28,  32,  29,  21,  10,   1,  -4,  -5 },
      {  -9,  -1,   7,  18,  27,  32,  30,  22,  11,   1,  -4,  -6 },
      {  -8,  -2,   6,  17,  27,  32,  30,  22,  12,   2,  -4,  -6 },
      {  -8,  -2,   6,  16,  26,  32,  31,  23,  12,   2,  -4,  -6 },
      {  -8,  -2,   5,  16,  26,  31,  31,  23,  13,   3,  -3,  -7 },
      {  -8,  -3,   5,  15,  25,  31,  31,  24,  14,   4,  -3,  -7 },
      {  -7,  -3,   4,  14,  25,  31,  31,  25,  14,   4,  -3,  -7 },
      {  -7,  -3,   4,  14,  24,  31,  31,  25,  15,   5,  -3,  -8 },
      {  -7,  -3,   3,  13,  23,  31,  31,  26,  16,   5,  -2,  -8 },
      {  -6,  -4,   2,  12,  23,  31,  32,  26,  16,   6,  -2,  -8 },
      {  -6,  -4,   2,  12,  22,  30,  32,  27,  17,   6,  -2,  -8 },
      {  -6,  -4,   1,  11,  22,  30,  32,  27,  18,   7,  -1,  -9 },
      {  -5,  -4,   1,  10,  21,  29,  32,  28,  18,   8,  -1,  -9 },
      {  -5,  -4,   0,  10,  20,  29,  32,  28,  19,   8,   0,  -9 }
    },
    { // D = 5.5
      {  -8,   7,  13,  18,  22,  24,  22,  18,  13,   7,   2, -10 },
      {  -8,   7,  13,  18,  22,  23,  22,  19,  13,   7,   2, -10 },
      {  -8,   6,  12,  18,  22,  23,  22,  19,  14,   8,   2, -10 },
      {  -9,   6,  12,  17,  22,  23,  23,  19,  14,   8,   3, -10 },
      {  -9,   6,  12,  17,  21,  23,  23,  19,  14,   9,   3, -10 },
      {  -9,   5,  11,  17,  21,  23,  23,  20,  15,   9,   3, -10 },
      {  -9,   5,  11,  16,  21,  23,  23,  20,  15,   9,   4, -10 },
      {  -9,   5,  10,  16,  21,  23,  23,  20,  15,  10,   4, -10 },
      { -10,   5,  10,  16,  20,  23,  23,  20,  16,  10,   5, -10 },
      { -10,   4,  10,  15,  20,  23,  23,  21,  16,  10,   5,  -9 },
      { -10,   4,   9,  15,  20,  23,  23,  21,  16,  11,   5,  -9 },
      { -10,   3,   9,  15,  20,  23,  23,  21,  17,  11,   5,  -9 },
      { -10,   3,   9,  14,  19,  23,  23,  21,  17,  12,   6,  -9 },
      { -10,   3,   8,  14,  19,  23,  23,  22,  17,  12,   6,  -9 },
      { -10,   2,   8,  14,  19,  22,  23,  22,  18,  12,   6,  -8 },
      { -10,   2,   7,  13,  19,  22,  23,  22,  18,  13,   7,  -8 }
    }
};

void Picture::sampleRateConv( const std::pair<int, int> scalingRatio, const std::pair<int, int> compScale,
                              const CPelBuf& beforeScale, const int beforeScaleLeftOffset, const int beforeScaleTopOffset,
                              const PelBuf& afterScale, const int afterScaleLeftOffset, const int afterScaleTopOffset,
                              const int bitDepth, const bool useLumaFilter, const bool downsampling,
                              const bool horCollocatedPositionFlag, const bool verCollocatedPositionFlag )
{
  const Pel* orgSrc = beforeScale.buf;
  const int orgWidth = beforeScale.width;
  const int orgHeight = beforeScale.height;
  const int orgStride = beforeScale.stride;

  Pel* scaledSrc = afterScale.buf;
  const int scaledWidth = afterScale.width;
  const int scaledHeight = afterScale.height;
  const int scaledStride = afterScale.stride;

  if( orgWidth == scaledWidth && orgHeight == scaledHeight && scalingRatio == SCALE_1X && !beforeScaleLeftOffset && !beforeScaleTopOffset && !afterScaleLeftOffset && !afterScaleTopOffset )
  {
    for( int j = 0; j < orgHeight; j++ )
    {
      memcpy( scaledSrc + j * scaledStride, orgSrc + j * orgStride, sizeof( Pel ) * orgWidth );
    }

    return;
  }

  const TFilterCoeff* filterHor = useLumaFilter ? &InterpolationFilter::m_lumaFilter[0][0] : &InterpolationFilter::m_chromaFilter[0][0];
  const TFilterCoeff* filterVer = useLumaFilter ? &InterpolationFilter::m_lumaFilter[0][0] : &InterpolationFilter::m_chromaFilter[0][0];
  const int numFracPositions = useLumaFilter ? 15 : 31;
  const int numFracShift = useLumaFilter ? 4 : 5;
  const int posShiftX = SCALE_RATIO_BITS - numFracShift + compScale.first;
  const int posShiftY = SCALE_RATIO_BITS - numFracShift + compScale.second;
  int addX = ( 1 << ( posShiftX - 1 ) ) + ( beforeScaleLeftOffset << SCALE_RATIO_BITS ) + ( ( int( 1 - horCollocatedPositionFlag ) * 8 * ( scalingRatio.first - SCALE_1X.first ) + ( 1 << ( 2 + compScale.first ) ) ) >> ( 3 + compScale.first ) );
  int addY = ( 1 << ( posShiftY - 1 ) ) + ( beforeScaleTopOffset << SCALE_RATIO_BITS ) + ( ( int( 1 - verCollocatedPositionFlag ) * 8 * ( scalingRatio.second - SCALE_1X.second ) + ( 1 << ( 2 + compScale.second ) ) ) >> ( 3 + compScale.second ) );

  if( downsampling )
  {
    int verFilter = 0;
    int horFilter = 0;

    if( scalingRatio.first > ( 15 << SCALE_RATIO_BITS ) / 4 )   horFilter = 7;
    else if( scalingRatio.first > ( 20 << SCALE_RATIO_BITS ) / 7 )   horFilter = 6;
    else if( scalingRatio.first > ( 5 << SCALE_RATIO_BITS ) / 2 )   horFilter = 5;
    else if( scalingRatio.first > ( 2 << SCALE_RATIO_BITS ) )   horFilter = 4;
    else if( scalingRatio.first > ( 5 << SCALE_RATIO_BITS ) / 3 )   horFilter = 3;
    else if( scalingRatio.first > ( 5 << SCALE_RATIO_BITS ) / 4 )   horFilter = 2;
    else if( scalingRatio.first > ( 20 << SCALE_RATIO_BITS ) / 19 )   horFilter = 1;

    if( scalingRatio.second > ( 15 << SCALE_RATIO_BITS ) / 4 )   verFilter = 7;
    else if( scalingRatio.second > ( 20 << SCALE_RATIO_BITS ) / 7 )   verFilter = 6;
    else if( scalingRatio.second > ( 5 << SCALE_RATIO_BITS ) / 2 )   verFilter = 5;
    else if( scalingRatio.second > ( 2 << SCALE_RATIO_BITS ) )   verFilter = 4;
    else if( scalingRatio.second > ( 5 << SCALE_RATIO_BITS ) / 3 )   verFilter = 3;
    else if( scalingRatio.second > ( 5 << SCALE_RATIO_BITS ) / 4 )   verFilter = 2;
    else if( scalingRatio.second > ( 20 << SCALE_RATIO_BITS ) / 19 )   verFilter = 1;

    filterHor = &DownsamplingFilterSRC[horFilter][0][0];
    filterVer = &DownsamplingFilterSRC[verFilter][0][0];
  }

  const int filterLength = downsampling ? 12 : ( useLumaFilter ? NTAPS_LUMA : NTAPS_CHROMA );
  const int log2Norm = downsampling ? 14 : 12;

  int *buf = new int[orgHeight * scaledWidth];
  int maxVal = ( 1 << bitDepth ) - 1;

  CHECK( bitDepth > 17, "Overflow may happen!" );

  for( int i = 0; i < scaledWidth; i++ )
  {
    const Pel* org = orgSrc;
    int refPos = ( ( ( i << compScale.first ) - afterScaleLeftOffset ) * scalingRatio.first + addX ) >> posShiftX;
    int integer = refPos >> numFracShift;
    int frac = refPos & numFracPositions;
    int* tmp = buf + i;

    for( int j = 0; j < orgHeight; j++ )
    {
      int sum = 0;
      const TFilterCoeff* f = filterHor + frac * filterLength;

      for( int k = 0; k < filterLength; k++ )
      {
        int xInt = std::min<int>( std::max( 0, integer + k - filterLength / 2 + 1 ), orgWidth - 1 );
        sum += f[k] * org[xInt]; // postpone horizontal filtering gain removal after vertical filtering
      }

      *tmp = sum;

      tmp += scaledWidth;
      org += orgStride;
    }
  }

  Pel* dst = scaledSrc;

  for( int j = 0; j < scaledHeight; j++ )
  {
    int refPos = ( ( ( j << compScale.second ) - afterScaleTopOffset ) * scalingRatio.second + addY ) >> posShiftY;
    int integer = refPos >> numFracShift;
    int frac = refPos & numFracPositions;

    for( int i = 0; i < scaledWidth; i++ )
    {
      int sum = 0;
      int* tmp = buf + i;
      const TFilterCoeff* f = filterVer + frac * filterLength;

      for( int k = 0; k < filterLength; k++ )
      {
        int yInt = std::min<int>( std::max( 0, integer + k - filterLength / 2 + 1 ), orgHeight - 1 );
        sum += f[k] * tmp[yInt*scaledWidth];
      }

      dst[i] = std::min<int>( std::max( 0, ( sum + ( 1 << ( log2Norm - 1 ) ) ) >> log2Norm ), maxVal );
    }

    dst += scaledStride;
  }

  delete[] buf;
}

void Picture::rescalePicture( const std::pair<int, int> scalingRatio,
                              const CPelUnitBuf& beforeScaling, const Window& scalingWindowBefore,
                              const PelUnitBuf& afterScaling, const Window& scalingWindowAfter,
                              const ChromaFormat chromaFormatIDC, const BitDepths& bitDepths, const bool useLumaFilter, const bool downsampling,
                              const bool horCollocatedChromaFlag, const bool verCollocatedChromaFlag )
{
  for( int comp = 0; comp < ::getNumberValidComponents( chromaFormatIDC ); comp++ )
  {
    ComponentID compID = ComponentID( comp );
    const CPelBuf& beforeScale = beforeScaling.get( compID );
    const PelBuf& afterScale = afterScaling.get( compID );

    sampleRateConv( scalingRatio, std::pair<int, int>( ::getComponentScaleX( compID, chromaFormatIDC ), ::getComponentScaleY( compID, chromaFormatIDC ) ),
                    beforeScale, scalingWindowBefore.getWindowLeftOffset() * SPS::getWinUnitX( chromaFormatIDC ), scalingWindowBefore.getWindowTopOffset() * SPS::getWinUnitY( chromaFormatIDC ),
                    afterScale, scalingWindowAfter.getWindowLeftOffset() * SPS::getWinUnitX( chromaFormatIDC ), scalingWindowAfter.getWindowTopOffset() * SPS::getWinUnitY( chromaFormatIDC ),
                    bitDepths.recon[toChannelType(compID)], downsampling || useLumaFilter ? true : isLuma( compID ), downsampling,
                    isLuma( compID ) ? 1 : horCollocatedChromaFlag, isLuma( compID ) ? 1 : verCollocatedChromaFlag );
  }
}

void Picture::saveSubPicBorder(int POC, int subPicX0, int subPicY0, int subPicWidth, int subPicHeight)
{

  // 1.1 set up margin for back up memory allocation
  int xMargin = margin >> getComponentScaleX(COMPONENT_Y, cs->area.chromaFormat);
  int yMargin = margin >> getComponentScaleY(COMPONENT_Y, cs->area.chromaFormat);

  // 1.2 measure the size of back up memory
  Area areaAboveBelow(0, 0, subPicWidth + 2 * xMargin, yMargin);
  Area areaLeftRight(0, 0, xMargin, subPicHeight);
  UnitArea unitAreaAboveBelow(cs->area.chromaFormat, areaAboveBelow);
  UnitArea unitAreaLeftRight(cs->area.chromaFormat, areaLeftRight);

  // 1.3 create back up memory
  m_bufSubPicAbove.create(unitAreaAboveBelow);
  m_bufSubPicBelow.create(unitAreaAboveBelow);
  m_bufSubPicLeft.create(unitAreaLeftRight);
  m_bufSubPicRight.create(unitAreaLeftRight);

  for (int comp = 0; comp < getNumberValidComponents(cs->area.chromaFormat); comp++)
  {
    ComponentID compID = ComponentID(comp);

    // 2.1 measure the margin for each component
    int xmargin = margin >> getComponentScaleX(compID, cs->area.chromaFormat);
    int ymargin = margin >> getComponentScaleY(compID, cs->area.chromaFormat);

    // 2.2 calculate the origin of the subpicture
    int left = subPicX0 >> getComponentScaleX(compID, cs->area.chromaFormat);
    int top = subPicY0 >> getComponentScaleY(compID, cs->area.chromaFormat);

    // 2.3 calculate the width/height of the subPic
    int width = subPicWidth >> getComponentScaleX(compID, cs->area.chromaFormat);
    int height = subPicHeight >> getComponentScaleY(compID, cs->area.chromaFormat);


    // 3.1.1 set reconstructed picture
    PelBuf s = M_BUFS(0, PIC_RECONSTRUCTION).get(compID);
    Pel *src = s.bufAt(left, top);

    // 3.2.1 set back up buffer for left
    PelBuf dBufLeft   = m_bufSubPicLeft.getBuf(compID);
    Pel    *dstLeft   = dBufLeft.bufAt(0, 0);


    // 3.2.2 set back up buffer for right
    PelBuf dBufRight  = m_bufSubPicRight.getBuf(compID);
    Pel    *dstRight  = dBufRight.bufAt(0, 0);

    // 3.2.3 copy to recon picture to back up buffer
    Pel *srcLeft  = src - xmargin;
    Pel *srcRight = src + width;
    for (int y = 0; y < height; y++)
    {
      ::memcpy(dstLeft  + y *  dBufLeft.stride, srcLeft  + y * s.stride, sizeof(Pel) * xmargin);
      ::memcpy(dstRight + y * dBufRight.stride, srcRight + y * s.stride, sizeof(Pel) * xmargin);
    }

    // 3.3.1 set back up buffer for above
    PelBuf dBufTop = m_bufSubPicAbove.getBuf(compID);
    Pel    *dstTop = dBufTop.bufAt(0, 0);

    // 3.3.2 set back up buffer for below
    PelBuf dBufBottom = m_bufSubPicBelow.getBuf(compID);
    Pel    *dstBottom = dBufBottom.bufAt(0, 0);

    // 3.3.3 copy to recon picture to back up buffer
    Pel *srcTop    = src - xmargin - ymargin * s.stride;
    Pel *srcBottom = src - xmargin +  height * s.stride;
    for (int y = 0; y < ymargin; y++)
    {
      ::memcpy(dstTop    + y *    dBufTop.stride, srcTop    + y * s.stride, sizeof(Pel) * (2 * xmargin + width));
      ::memcpy(dstBottom + y * dBufBottom.stride, srcBottom + y * s.stride, sizeof(Pel) * (2 * xmargin + width));
    }
  }
}

void Picture::extendSubPicBorder(int POC, int subPicX0, int subPicY0, int subPicWidth, int subPicHeight)
{

  for (int comp = 0; comp < getNumberValidComponents(cs->area.chromaFormat); comp++)
  {
    ComponentID compID = ComponentID(comp);

    // 2.1 measure the margin for each component
    int xmargin = margin >> getComponentScaleX(compID, cs->area.chromaFormat);
    int ymargin = margin >> getComponentScaleY(compID, cs->area.chromaFormat);

    // 2.2 calculate the origin of the Subpicture
    int left = subPicX0 >> getComponentScaleX(compID, cs->area.chromaFormat);
    int top = subPicY0 >> getComponentScaleY(compID, cs->area.chromaFormat);

    // 2.3 calculate the width/height of the Subpicture
    int width = subPicWidth >> getComponentScaleX(compID, cs->area.chromaFormat);
    int height = subPicHeight >> getComponentScaleY(compID, cs->area.chromaFormat);

    // 3.1 set reconstructed picture
    PelBuf s = M_BUFS(0, PIC_RECONSTRUCTION).get(compID);
    Pel *src = s.bufAt(left, top);

    // 4.1 apply padding for left and right
    {
      Pel *dstLeft  = src - xmargin;
      Pel *dstRight = src + width;
      Pel *srcLeft  = src + 0;
      Pel *srcRight = src + width - 1;

      for (int y = 0; y < height; y++)
      {
        for (int x = 0; x < xmargin; x++)
        {
          dstLeft[x]  = *srcLeft;
          dstRight[x] = *srcRight;
        }
        dstLeft += s.stride;
        dstRight += s.stride;
        srcLeft += s.stride;
        srcRight += s.stride;
      }
    }

    // 4.2 apply padding on bottom
    Pel *srcBottom = src + s.stride * (height - 1) - xmargin;
    Pel *dstBottom = srcBottom + s.stride;
    for (int y = 0; y < ymargin; y++)
    {
      ::memcpy(dstBottom, srcBottom, sizeof(Pel)*(2 * xmargin + width));
      dstBottom += s.stride;
    }

    // 4.3 apply padding for top
    // si is still (-marginX, SubpictureHeight-1)
    Pel *srcTop = src - xmargin;
    Pel *dstTop = srcTop - s.stride;
    // si is now (-marginX, 0)
    for (int y = 0; y < ymargin; y++)
    {
      ::memcpy(dstTop, srcTop, sizeof(Pel)*(2 * xmargin + width));
      dstTop -= s.stride;
    }
  } // end of for
}

void Picture::restoreSubPicBorder(int POC, int subPicX0, int subPicY0, int subPicWidth, int subPicHeight)
{
  for (int comp = 0; comp < getNumberValidComponents(cs->area.chromaFormat); comp++)
  {
    ComponentID compID = ComponentID(comp);

    // 2.1 measure the margin for each component
    int xmargin = margin >> getComponentScaleX(compID, cs->area.chromaFormat);
    int ymargin = margin >> getComponentScaleY(compID, cs->area.chromaFormat);

    // 2.2 calculate the origin of the subpicture
    int left = subPicX0 >> getComponentScaleX(compID, cs->area.chromaFormat);
    int top = subPicY0 >> getComponentScaleY(compID, cs->area.chromaFormat);

    // 2.3 calculate the width/height of the subpicture
    int width = subPicWidth >> getComponentScaleX(compID, cs->area.chromaFormat);
    int height = subPicHeight >> getComponentScaleY(compID, cs->area.chromaFormat);

    // 3.1 set reconstructed picture
    PelBuf s = M_BUFS(0, PIC_RECONSTRUCTION).get(compID);
    Pel *src = s.bufAt(left, top);

    // 4.2.1 copy from back up buffer to recon picture
    PelBuf dBufLeft = m_bufSubPicLeft.getBuf(compID);
    Pel    *dstLeft = dBufLeft.bufAt(0, 0);

    // 4.2.2 set back up buffer for right
    PelBuf dBufRight = m_bufSubPicRight.getBuf(compID);
    Pel    *dstRight = dBufRight.bufAt(0, 0);

    // 4.2.3 copy to recon picture to back up buffer
    Pel *srcLeft  = src - xmargin;
    Pel *srcRight = src + width;

    for (int y = 0; y < height; y++)
    {
      // the destination and source position is reversed on purpose
      ::memcpy(srcLeft  + y * s.stride,  dstLeft + y *  dBufLeft.stride, sizeof(Pel) * xmargin);
      ::memcpy(srcRight + y * s.stride, dstRight + y * dBufRight.stride, sizeof(Pel) * xmargin);
    }


    // 4.3.1 set back up buffer for above
    PelBuf dBufTop = m_bufSubPicAbove.getBuf(compID);
    Pel    *dstTop = dBufTop.bufAt(0, 0);

    // 4.3.2 set back up buffer for below
    PelBuf dBufBottom = m_bufSubPicBelow.getBuf(compID);
    Pel    *dstBottom = dBufBottom.bufAt(0, 0);

    // 4.3.3 copy to recon picture to back up buffer
    Pel *srcTop = src - xmargin - ymargin * s.stride;
    Pel *srcBottom = src - xmargin + height * s.stride;

    for (int y = 0; y < ymargin; y++)
    {
      ::memcpy(srcTop    + y * s.stride, dstTop    + y *    dBufTop.stride, sizeof(Pel) * (2 * xmargin + width));
      ::memcpy(srcBottom + y * s.stride, dstBottom + y * dBufBottom.stride, sizeof(Pel) * (2 * xmargin + width));
    }
  }

  // 5.0 destroy the back up memory
  m_bufSubPicAbove.destroy();
  m_bufSubPicBelow.destroy();
  m_bufSubPicLeft.destroy();
  m_bufSubPicRight.destroy();
}

#if JVET_Q0764_WRAP_AROUND_WITH_RPR  
void Picture::extendPicBorder( const PPS *pps )
#else
void Picture::extendPicBorder()
#endif
{
  if ( m_bIsBorderExtended )
  {
#if JVET_Q0764_WRAP_AROUND_WITH_RPR
    if( isWrapAroundEnabled( pps ) && ( !m_wrapAroundValid || m_wrapAroundOffset != pps->getWrapAroundOffset() ) )
    {
      extendWrapBorder( pps );
    }
#endif
    return;
  }

  for(int comp=0; comp<getNumberValidComponents( cs->area.chromaFormat ); comp++)
  {
    ComponentID compID = ComponentID( comp );
    PelBuf p = M_BUFS( 0, PIC_RECONSTRUCTION ).get( compID );
    Pel *piTxt = p.bufAt(0,0);
    int xmargin = margin >> getComponentScaleX( compID, cs->area.chromaFormat );
    int ymargin = margin >> getComponentScaleY( compID, cs->area.chromaFormat );

    Pel*  pi = piTxt;
    // do left and right margins
      for (int y = 0; y < p.height; y++)
      {
        for (int x = 0; x < xmargin; x++ )
        {
          pi[ -xmargin + x ] = pi[0];
          pi[  p.width + x ] = pi[p.width-1];
        }
        pi += p.stride;
      }

    // pi is now the (0,height) (bottom left of image within bigger picture
    pi -= (p.stride + xmargin);
    // pi is now the (-marginX, height-1)
    for (int y = 0; y < ymargin; y++ )
    {
      ::memcpy( pi + (y+1)*p.stride, pi, sizeof(Pel)*(p.width + (xmargin << 1)));
    }

    // pi is still (-marginX, height-1)
    pi -= ((p.height-1) * p.stride);
    // pi is now (-marginX, 0)
    for (int y = 0; y < ymargin; y++ )
    {
      ::memcpy( pi - (y+1)*p.stride, pi, sizeof(Pel)*(p.width + (xmargin<<1)) );
    }