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/** \file     Reshape.cpp

    \brief    common reshaper class

*/

#include "Reshape.h"

#include <stdio.h>

#include <string.h>

#include <math.h>

#include <UnitTools.h>

#include "CommonLib/TimeProfiler.h"

#if ENABLE_SIMD_OPT_BUFFER && defined( TARGET_SIMD_X86 )

#include <CommonDefX86.h>

#include <simde/x86/sse.h>

#endif

namespace vvdec

{

// ====================================================================================================================

// Constructor / destructor / create / destroy

// ====================================================================================================================

Reshape::Reshape()

{

  m_invLUT = nullptr;

  m_lumaBD=0;

  m_chromaScale = 1 << CSCALE_FP_PREC;

  m_vpduX = -1;

  m_vpduY = -1;

}

Reshape::~Reshape()

{

  destroy();

}

void  Reshape::createDec(int bitDepth)

{

  //sanity check

  if (m_lumaBD != bitDepth)

  {

    if (m_invLUT )

    {

      xFree( m_invLUT );

      m_invLUT = nullptr;

    }

  }

  m_lumaBD = bitDepth;

  m_reshapeLUTSize = 1 << m_lumaBD;

  m_initCW = m_reshapeLUTSize / PIC_CODE_CW_BINS;

  if( !m_invLUT )

  {

    m_invLUT = ( Pel* ) xMalloc( Pel, m_reshapeLUTSize + 1 );

    memset( m_invLUT, 0, ( m_reshapeLUTSize + 1 ) * sizeof( Pel ) );

  }

  if (m_binCW.empty())

    m_binCW.resize(PIC_CODE_CW_BINS, 0);

  if (m_inputPivot.empty())

    m_inputPivot.resize(PIC_CODE_CW_BINS + 1, 0);

  if (m_fwdScaleCoef.empty())

    m_fwdScaleCoef.resize(PIC_CODE_CW_BINS, 1 << FP_PREC);

  if (m_invScaleCoef.empty())

    m_invScaleCoef.resize(PIC_CODE_CW_BINS, 1 << FP_PREC);

  if (m_reshapePivot.empty())

    m_reshapePivot.resize(PIC_CODE_CW_BINS + 1, 0);

  if (m_chromaAdjHelpLUT.empty())

    m_chromaAdjHelpLUT.resize(PIC_CODE_CW_BINS, 1<<CSCALE_FP_PREC);

}

void  Reshape::destroy()

{

  xFree( m_invLUT );

  m_invLUT = nullptr;

}

void  Reshape::initSlice( int nalUnitLayerId, const PicHeader& picHeader, const VPS* vps )

{

  if( picHeader.getLmcsEnabledFlag() )

  {

    if( nalUnitLayerId != picHeader.getLmcsAPS()->getLayerId() )

    {

      for (int i = 0; vps && i < vps->getNumOutputLayerSets(); i++ )

      {

        bool isCurrLayerInOls = false;

        bool isRefLayerInOls = false;

        for( int j = vps->getNumLayersInOls(i) - 1; j >= 0; j-- )

        {

          if( vps->getLayerIdInOls(i, j) == nalUnitLayerId )

          {

            isCurrLayerInOls = true;

          }

          if( vps->getLayerIdInOls(i, j) == picHeader.getLmcsAPS()->getLayerId() )

          {

            isRefLayerInOls = true;

          }

        }

        CHECK( isCurrLayerInOls && !isRefLayerInOls, "When VCL NAl unit in layer A refers to APS in layer B, all OLS that contains layer A shall also contains layer B" );

      }

    }

    const SliceReshapeInfo& sInfo = picHeader.getLmcsAPS()->getReshaperAPSInfo();

    m_sliceReshapeInfo.sliceReshaperEnableFlag       = true;

    m_sliceReshapeInfo.sliceReshaperModelPresentFlag = true;

    m_sliceReshapeInfo.enableChromaAdj               = picHeader.getLmcsChromaResidualScaleFlag();

    m_sliceReshapeInfo.reshaperModelMaxBinIdx        = sInfo.reshaperModelMaxBinIdx;

    m_sliceReshapeInfo.reshaperModelMinBinIdx        = sInfo.reshaperModelMinBinIdx;

    m_sliceReshapeInfo.maxNbitsNeededDeltaCW         = sInfo.maxNbitsNeededDeltaCW;

    m_sliceReshapeInfo.chrResScalingOffset           = sInfo.chrResScalingOffset;

    memcpy( m_sliceReshapeInfo.reshaperModelBinCWDelta, sInfo.reshaperModelBinCWDelta, sizeof( int ) * ( PIC_CODE_CW_BINS ) );

    constructReshaper();

  }

  else

  {

    m_sliceReshapeInfo.sliceReshaperEnableFlag       = false;

    m_sliceReshapeInfo.enableChromaAdj               = false;

    m_sliceReshapeInfo.sliceReshaperModelPresentFlag = false;

  }

  m_vpduX = -1;

  m_vpduY = -1;

}

bool Reshape::getCTUFlag( const Slice& slice ) const

{

  if( (slice.getSliceType() == I_SLICE) && m_sliceReshapeInfo.sliceReshaperEnableFlag )

  {

    return false;

  }

  else

  {

    return m_sliceReshapeInfo.sliceReshaperEnableFlag;

  }

}

/** compute chroma residuce scale for TU

* \param average luma pred of TU

* \return chroma residue scale

*/

int  Reshape::calculateChromaAdj(Pel avgLuma) const

{

  int iAdj = m_chromaAdjHelpLUT[getPWLIdxInv(avgLuma)];

  return(iAdj);

}

/** compute chroma residuce scale for TU

* \param average luma pred of TU

* \return chroma residue scale

*/

int  Reshape::calculateChromaAdjVpduNei(TransformUnit &tu, const Position pos)

{

  CodingStructure &cs = *tu.cu->cs;

  int xPos = pos.x;

  int yPos = pos.y;

  int ctuSize = cs.sps->getCTUSize();

  int numNeighbor = std::min(64, ctuSize);

  int numNeighborLog = getLog2(numNeighbor);

  if (ctuSize == 128)

  {

    xPos &= ~63;

    yPos &= ~63;

  }

  else

  {

    xPos &= ~( ctuSize - 1 );

    yPos &= ~( ctuSize - 1 );

  }

  if( isVPDUprocessed( xPos, yPos ) )

  {

    return getChromaScale();

  }

  else

  {

    setVPDULoc(xPos, yPos);

    Position topLeft(xPos, yPos);

    CodingUnit *topLeftLuma;

    const CodingUnit *cuAbove, *cuLeft;

    topLeftLuma = cs.getCU( topLeft, CHANNEL_TYPE_LUMA );

    cuAbove     = cs.getCURestricted( topLeftLuma->lumaPos().offset( 0, -1 ), *topLeftLuma, CHANNEL_TYPE_LUMA, topLeftLuma->ly() == yPos ? topLeftLuma : topLeftLuma->above );

    cuLeft      = cs.getCURestricted( topLeftLuma->lumaPos().offset( -1, 0 ), *topLeftLuma, CHANNEL_TYPE_LUMA, topLeftLuma->lx() == xPos ? topLeftLuma : topLeftLuma->left  );

    xPos = topLeftLuma->lumaPos().x;

    yPos = topLeftLuma->lumaPos().y;

    CompArea lumaArea = CompArea(COMPONENT_Y, topLeftLuma->lumaPos(), topLeftLuma->lumaSize());

    PelBuf piRecoY = cs.picture->getRecoBuf(lumaArea);

    ptrdiff_t strideY = piRecoY.stride;

    int chromaScale = (1 << CSCALE_FP_PREC);

    int lumaValue = -1;

    Pel* recSrc0 = piRecoY.bufAt(0, 0);

    const uint32_t picH = tu.cu->cs->picture->lheight();

    const uint32_t picW = tu.cu->cs->picture->lwidth();

    const Pel   valueDC = 1 << (tu.cu->sps->getBitDepth() - 1);

    int32_t recLuma = 0;

    int pelnum = 0;

    if (cuLeft != nullptr)

    {

      for (int i = 0; i < numNeighbor; i++)

      {

        int k = (yPos + i) >= picH ? (picH - yPos - 1) : i;

        recLuma += recSrc0[-1 + k * strideY];

        pelnum++;

      }

    }

    if (cuAbove != nullptr)

    {

      for (int i = 0; i < numNeighbor; i++)

      {

        int k = (xPos + i) >= picW ? (picW - xPos - 1) : i;

        recLuma += recSrc0[-strideY + k];

        pelnum++;

      }

    }

    if (pelnum == numNeighbor)

    {

      lumaValue = (recLuma + (1 << (numNeighborLog - 1))) >> numNeighborLog;

    }

    else if (pelnum == (numNeighbor << 1))

    {

      lumaValue = (recLuma + (1 << numNeighborLog)) >> (numNeighborLog + 1);

    }

    else

    {

      CHECK(pelnum != 0, "");

      lumaValue = valueDC;

    }

    chromaScale = calculateChromaAdj(lumaValue);

    setChromaScale(chromaScale);

    return(chromaScale);

  }

}

/** find inx of PWL for inverse mapping

* \param average luma pred of TU

* \return idx of PWL for inverse mapping

*/

int Reshape::getPWLIdxInv(int lumaVal) const

{

  int idxS = 0;

  for (idxS = m_sliceReshapeInfo.reshaperModelMinBinIdx; (idxS <= m_sliceReshapeInfo.reshaperModelMaxBinIdx); idxS++)

  {

    if (lumaVal < m_reshapePivot[idxS + 1])     break;

  }

  return std::min(idxS, PIC_CODE_CW_BINS-1);

}

/**

-copy Slice reshaper info structure

\param   tInfo describing the target Slice reshaper info structure

\param   sInfo describing the source Slice reshaper info structure

*/

void Reshape::copySliceReshaperInfo(SliceReshapeInfo& tInfo, SliceReshapeInfo& sInfo)

{

  tInfo.sliceReshaperModelPresentFlag = sInfo.sliceReshaperModelPresentFlag;

  if (sInfo.sliceReshaperModelPresentFlag)

  {

    tInfo.reshaperModelMaxBinIdx = sInfo.reshaperModelMaxBinIdx;

    tInfo.reshaperModelMinBinIdx = sInfo.reshaperModelMinBinIdx;

    memcpy(tInfo.reshaperModelBinCWDelta, sInfo.reshaperModelBinCWDelta, sizeof(int)*(PIC_CODE_CW_BINS));

    tInfo.maxNbitsNeededDeltaCW = sInfo.maxNbitsNeededDeltaCW;

    tInfo.chrResScalingOffset = sInfo.chrResScalingOffset;

  }

  tInfo.sliceReshaperEnableFlag = sInfo.sliceReshaperEnableFlag;

  if (sInfo.sliceReshaperEnableFlag)

    tInfo.enableChromaAdj = sInfo.enableChromaAdj;

  else

    tInfo.enableChromaAdj = 0;

}

/** Construct reshaper from syntax

* \param void

* \return void

*/

void Reshape::constructReshaper()

{

  int pwlFwdLUTsize = PIC_CODE_CW_BINS;

  int pwlFwdBinLen = m_reshapeLUTSize / PIC_CODE_CW_BINS;

  for (int i = 0; i < m_sliceReshapeInfo.reshaperModelMinBinIdx; i++)

    m_binCW[i] = 0;

  for (int i = m_sliceReshapeInfo.reshaperModelMaxBinIdx + 1; i < PIC_CODE_CW_BINS; i++)

    m_binCW[i] = 0;

  for (int i = m_sliceReshapeInfo.reshaperModelMinBinIdx; i <= m_sliceReshapeInfo.reshaperModelMaxBinIdx; i++)

    m_binCW[i] = (uint16_t)(m_sliceReshapeInfo.reshaperModelBinCWDelta[i] + (int)m_initCW);

  for (int i = 0; i < pwlFwdLUTsize; i++)

  {

    m_reshapePivot[i + 1] = m_reshapePivot[i] + m_binCW[i];

    m_inputPivot[i + 1] = m_inputPivot[i] + m_initCW;

    m_fwdScaleCoef[i] = ((int32_t)m_binCW[i] * (1 << FP_PREC) + (1 << (getLog2(pwlFwdBinLen) - 1))) >> getLog2(pwlFwdBinLen);

    if (m_binCW[i] == 0)

    {

      m_invScaleCoef[i] = 0;

      m_chromaAdjHelpLUT[i] = 1 << CSCALE_FP_PREC;

    }

    else

    {

      CHECK( m_initCW * (1 << FP_PREC) / m_binCW[i] > (1 << 15) - 1, "Inverse scale coeff doesn't fit in a short!" );

      m_invScaleCoef[i] = (int32_t)(m_initCW * (1 << FP_PREC) / m_binCW[i]);

      m_chromaAdjHelpLUT[i] = (int32_t)(m_initCW * (1 << FP_PREC) / ( m_binCW[i] + m_sliceReshapeInfo.chrResScalingOffset ) );

    }

  }

  for (int lumaSample = 0; lumaSample < m_reshapeLUTSize; lumaSample++)

  {

    int idxYInv = getPWLIdxInv(lumaSample);

    int invSample = m_inputPivot[idxYInv] + ((m_invScaleCoef[idxYInv] * (lumaSample - m_reshapePivot[idxYInv]) + (1 << (FP_PREC - 1))) >> FP_PREC);

    m_invLUT[lumaSample] = Clip3((Pel)0, (Pel)((1 << m_lumaBD) - 1), (Pel)(invSample));

  }

}

void Reshape::rspCtuBcw( CodingStructure& cs, int col, int ln ) const

{

  if( !cs.sps->getUseReshaper() || !m_sliceReshapeInfo.sliceReshaperEnableFlag )

  {

    return;

  }

  const Slice* slice = cs.getCtuData( col, ln ).slice;

  if( !slice->getLmcsEnabledFlag() )

  {

    return;

  }

  PROFILER_SCOPE_AND_STAGE_EXT( 1, g_timeProfiler, P_RESHAPER, cs, CH_L );

  const PreCalcValues& pcv = *cs.pcv;

  int xPos = pcv.maxCUWidth * col;

  int lw = std::min( pcv.lumaWidth - xPos, pcv.maxCUWidth );

  int yPos = ln * pcv.maxCUHeight;

  int lh = std::min( pcv.lumaHeight - yPos, pcv.maxCUHeight );

  PelBuf picYuvRec = cs.getRecoBuf( COMPONENT_Y ).subBuf( Position( xPos, yPos ), Size( lw, lh ) );

#if 1

  if( g_pelBufOP.rspBcw )

    g_pelBufOP.rspBcw( picYuvRec.buf, picYuvRec.stride, picYuvRec.width, picYuvRec.height, m_lumaBD, m_sliceReshapeInfo.reshaperModelMinBinIdx, m_sliceReshapeInfo.reshaperModelMaxBinIdx, m_reshapePivot.data(), m_invScaleCoef.data(), m_inputPivot.data() );

  else

#endif

    g_pelBufOP.applyLut( picYuvRec.buf, picYuvRec.stride, picYuvRec.width, picYuvRec.height, m_invLUT );

}

void Reshape::rspBufFwd( PelBuf& buf ) const

{

  g_pelBufOP.rspFwd( buf.buf, buf.stride, buf.width, buf.height, m_lumaBD, m_initCW, m_reshapePivot.data(), m_fwdScaleCoef.data(), m_inputPivot.data() );

}

}