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/** \file     Reshape.cpp

    \brief    common reshaper class

*/

#include "Reshape.h"

#include "UnitTools.h"

#include <stdio.h>

#include <string.h>

#include <math.h>

 //! \ingroup CommonLib

 //! \{

namespace vvenc {

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

// ReshapeData

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

int ReshapeData::getPWLIdxInv( int lumaVal ) const

{

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

  {

    if (lumaVal < m_reshapePivot[idxS + 1]) 

      return idxS;    

  }

  return PIC_CODE_CW_BINS-1; 

}

int ReshapeData::calculateChromaAdj( Pel avgLuma ) const

{

  int iAdj = m_chromaAdjHelpLUT[getPWLIdxInv(avgLuma)];

  return(iAdj);

}

int ReshapeData::calculateChromaAdjVpduNei( const TransformUnit& tu, const CompArea& areaY, const TreeType _treeType )

{

  CodingStructure &cs = *tu.cs;

  int xPos = areaY.lumaPos().x;

  int yPos = areaY.lumaPos().y;

  int numNeighborLog = std::min<unsigned>(6,cs.pcv->maxCUSizeLog2);

  int numNeighbor    =  1<<numNeighborLog;

  const int mask     = 1-numNeighbor-1;

  xPos &= mask;

  yPos &= mask;

  if( !true/*isEncoder*/ )

  {

    if( isVPDUprocessed( xPos, yPos ) )

    {

      return m_chromaScale;

    }

    setVPDULoc( xPos, yPos );

  }

  Position topLeft(xPos, yPos);

  CodingStructure* pcs =  (CS::isDualITree(cs) && cs.slice->sliceType == VVENC_I_SLICE) ? tu.cs->picture->cs : tu.cs;

  CodingUnit *topLeftLuma   = pcs->getCU(topLeft, CH_L, _treeType);

  const CodingUnit *cuAbove = pcs->getCURestricted( topLeftLuma->lumaPos().offset(0, -1), topLeftLuma->lumaPos(), topLeftLuma->slice->independentSliceIdx, topLeftLuma->tileIdx, CH_L, _treeType );

  const CodingUnit *cuLeft  = pcs->getCURestricted( topLeftLuma->lumaPos().offset(-1, 0), topLeftLuma->lumaPos(), topLeftLuma->slice->independentSliceIdx, topLeftLuma->tileIdx, CH_L, _treeType ); 

  xPos = topLeftLuma->lumaPos().x;

  yPos = topLeftLuma->lumaPos().y;

  const CPelBuf piRecoY = cs.picture->getRecoBuf(topLeftLuma->Y());

  const int strideY = piRecoY.stride;

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

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

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

  int32_t recLuma = 0;

  int pelnum = 0;

  if (cuLeft != nullptr)

  {

    pelnum ++;

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

    {

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

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

    }

  }

  if (cuAbove != nullptr)

  {

    pelnum++;

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

    {

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

      recLuma += recSrc0[-strideY + k];

    }

  }

  int lumaValue;

  if( pelnum )

  {

    const int shift = numNeighborLog + pelnum - 1;

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

  }

  else

  {

    lumaValue = 1 << (cs.sps->bitDepths[CH_L] - 1);

  }

  int chromaScale = calculateChromaAdj(lumaValue);

  if( !true/*isEncoder*/)

  {

    m_chromaScale = chromaScale;

  }

  return chromaScale;

}

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

// Reshape

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

void Reshape::createDec(int bitDepth)

{

  m_lumaBD = bitDepth;

  m_reshapeLUTSize = 1 << m_lumaBD;

  m_initCW = m_reshapeLUTSize / PIC_CODE_CW_BINS;

#if defined( TARGET_SIMD_X86 ) && ENABLE_SIMD_OPT_BUFFER

  if( m_fwdLUT.empty() )

    m_fwdLUT.resize( m_reshapeLUTSize + 2, 0 );

  if( m_invLUT.empty() )

    m_invLUT.resize( m_reshapeLUTSize + 2, 0 );

#else

  if( m_fwdLUT.empty() )

    m_fwdLUT.resize( m_reshapeLUTSize, 0 );

  if( m_invLUT.empty() )

    m_invLUT.resize( m_reshapeLUTSize, 0 );

#endif

  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);

}

/** 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 << (floorLog2(pwlFwdBinLen) - 1))) >> floorLog2(pwlFwdBinLen);

    if (m_binCW[i] == 0)

    {

      m_invScaleCoef[i] = 0;

      m_chromaAdjHelpLUT[i] = 1 << CSCALE_FP_PREC;

    }

    else

    {

      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 idxY = lumaSample / m_initCW;

    int tempVal = m_reshapePivot[idxY] + ((m_fwdScaleCoef[idxY] * (lumaSample - m_inputPivot[idxY]) + (1 << (FP_PREC - 1))) >> FP_PREC);

    m_fwdLUT[lumaSample] = Clip3((Pel)0, (Pel)((1 << m_lumaBD) - 1), (Pel)(tempVal));

    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::initLumaLevelToWeightTableReshape()

{

  const int lutSize = 1 << m_lumaBD;

  if (m_reshapeLumaLevelToWeightPLUT.empty())

    m_reshapeLumaLevelToWeightPLUT.resize(lutSize, 1.0);

  if (m_lumaLevelToWeightPLUT.empty())

    m_lumaLevelToWeightPLUT.resize(lutSize, 1.0);

  if (m_signalType == RESHAPE_SIGNAL_PQ)

  {

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

    {

      double x = m_lumaBD < 10 ? i << (10 - m_lumaBD) : m_lumaBD > 10 ? i >> (m_lumaBD - 10) : i;

      double y;

      y = 0.015*x - 1.5 - 6;

      y = y < -3 ? -3 : (y > 6 ? 6 : y);

      m_lumaLevelToWeightPLUT[i] = pow(2.0, y / 3.0);

      m_reshapeLumaLevelToWeightPLUT[i] = (uint32_t)(m_lumaLevelToWeightPLUT[i]* (double)(1 << 16));

    }

  }

}

void Reshape::updateReshapeLumaLevelToWeightTableChromaMD( const Pel* ILUT)

{

  const int lutSize = 1 << m_lumaBD;

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

  {

    m_reshapeLumaLevelToWeightPLUT[i] = (uint32_t)(m_lumaLevelToWeightPLUT[ILUT[i]]* (double)(1 << 16));

  }

}

void Reshape::restoreReshapeLumaLevelToWeightTable()

{

  const int lutSize = 1 << m_lumaBD;

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

  {

    m_reshapeLumaLevelToWeightPLUT[i] = (uint32_t)(m_lumaLevelToWeightPLUT[i]* (double)(1 << 16));

  }

}

void Reshape::updateReshapeLumaLevelToWeightTable(LmcsParam &sliceReshape, Pel* wtTable, double cwt)

{

  if (m_signalType == RESHAPE_SIGNAL_SDR || m_signalType == RESHAPE_SIGNAL_HLG)

  {

    if (sliceReshape.sliceReshaperModelPresent )

    {

      double wBin = 1.0;

      double weight = 1.0;

      int histLens = (1 << m_lumaBD) / PIC_CODE_CW_BINS;

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

      {

        if ((i < sliceReshape.reshaperModelMinBinIdx) || (i > sliceReshape.reshaperModelMaxBinIdx))

          weight = 1.0;

        else

        {

          if (sliceReshape.reshaperModelBinCWDelta[i] == 1 || (sliceReshape.reshaperModelBinCWDelta[i] == -1 * histLens))

            weight = wBin;

          else

          {

            weight = (double)wtTable[i] / (double)histLens;

            weight = weight*weight;

          }

        }

        for (int j = 0; j < histLens; j++)

        {

          int ii = i*histLens + j;

          m_reshapeLumaLevelToWeightPLUT[ii] = (uint32_t)(weight* (double)(1 << 16));

        }

      }

      m_chromaWeightRS = cwt;

    }

    else

    {

      THROW("updateReshapeLumaLevelToWeightTable ERROR!!");

    }

  }

  else

  {

    THROW("updateReshapeLumaLevelToWeightTable not support other signal types!!");

  }

}

} // namespace vvenc

//

//! \}