/* The copyright in this software is being made available under the BSD
* License, included below. This software may be subject to other third party
* and contributor rights, including patent rights, and no such rights are
* granted under this license.
*
* Copyright (c) 2010-2019, ITU/ISO/IEC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*  * Redistributions of source code must retain the above copyright notice,
*    this list of conditions and the following disclaimer.
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*    this list of conditions and the following disclaimer in the documentation
*    and/or other materials provided with the distribution.
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*    be used to endorse or promote products derived from this software without
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/** \file     Buffer.cpp
 *  \brief    Low-overhead class describing 2D memory layout
 */

#define DONT_UNDEF_SIZE_AWARE_PER_EL_OP

// unit needs to come first due to a forward declaration
#include "Unit.h"
#include "Buffer.h"
#include "InterpolationFilter.h"

#if JVET_P0154_PROF_SAMPLE_OFFSET_CLIPPING
void applyPROFCore(Pel* dst, int dstStride, const Pel* src, int srcStride, int width, int height, const Pel* gradX, const Pel* gradY, int gradStride, const int* dMvX, const int* dMvY, int dMvStride, const bool& bi, int shiftNum, Pel offset, const ClpRng& clpRng)
#else
void applyPROFCore(Pel* dst, int dstStride, const Pel* src, int srcStride, int width, int height, const Pel* gradX, const Pel* gradY, int gradStride, const int* dMvX, const int* dMvY, int dMvStride, int shiftNum, Pel offset, const ClpRng& clpRng)
#endif
{
  int idx = 0;
#if !JVET_P0057_BDOF_PROF_HARMONIZATION 
  const int dIshift = 1;
  const int dIoffset = 1 << (dIshift - 1);
#endif

#if JVET_P0154_PROF_SAMPLE_OFFSET_CLIPPING
  const int dILimit = 1 << std::max<int>(clpRng.bd + 1, 13);
#endif
  for (int h = 0; h < height; h++)
  {
    for (int w = 0; w < width; w++)
    {
      int32_t dI = dMvX[idx] * gradX[w] + dMvY[idx] * gradY[w];
#if !JVET_P0057_BDOF_PROF_HARMONIZATION 
      dI = (dI + dIoffset) >> dIshift;
#endif
#if JVET_P0154_PROF_SAMPLE_OFFSET_CLIPPING
      dI = Clip3(-dILimit, dILimit - 1, dI);
      dst[w] = src[w] + dI;
      if (!bi)
      {
        dst[w] = (dst[w] + offset) >> shiftNum;
        dst[w] = ClipPel(dst[w], clpRng);
      }
#else
      dI = (src[w] + dI + offset) >> shiftNum;
      dst[w] = (Pel)ClipPel(dI, clpRng);
#endif

      idx++;
    }
    gradX += gradStride;
    gradY += gradStride;
    dst += dstStride;
    src += srcStride;
  }
}

#if !JVET_P0154_PROF_SAMPLE_OFFSET_CLIPPING
template<bool l1PROFEnabled = true>
void applyBiPROFCore (Pel* dst, int dstStride, const Pel* src0, const Pel* src1, int srcStride, int width, int height, const Pel* gradX0, const Pel* gradY0, const Pel* gradX1, const Pel* gradY1, int gradStride, const int* dMvX0, const int* dMvY0, const int* dMvX1, const int* dMvY1, int dMvStride, const int8_t w0, const ClpRng& clpRng)
{
  int idx = 16;
  int32_t dI0 = 0;
  int32_t dI1 = 0;
#if !JVET_P0057_BDOF_PROF_HARMONIZATION 
  const int dIshift = 1;
  const int dIoffset = 1 << (dIshift - 1);
#endif

  const int clipbd = clpRng.bd;
  const int shiftNum = std::max<int>(2, (IF_INTERNAL_PREC - clipbd)) + g_GbiLog2WeightBase;
  const int offset = (1 << (shiftNum - 1)) + (IF_INTERNAL_OFFS << g_GbiLog2WeightBase);

#if JVET_P0154_PROF_SAMPLE_OFFSET_CLIPPING
  const int dILimit = 1 << std::max<int>(clpRng.bd + 1, 13);
#endif

  const int8_t w1 = g_GbiWeightBase - w0;

  for (int h = 0; h < height; h++)
  {
    if (!(h & 3)) idx -= 16;
    idx += 4;

    for (int w = 0; w < width; w++)
    {
      if (!(w & 3)) idx -= 4;
      dI0 = dMvX0[idx] * gradX0[w] + dMvY0[idx] * gradY0[w];
#if !JVET_P0057_BDOF_PROF_HARMONIZATION
      dI0 = (dI0 + dIoffset) >> dIshift;
#endif
#if JVET_P0154_PROF_SAMPLE_OFFSET_CLIPPING
      dI0 = Clip3(-dILimit, dILimit - 1, dI0);
#endif
      if (l1PROFEnabled)
      {
        dI1 = dMvX1[idx] * gradX1[w] + dMvY1[idx] * gradY1[w];
#if !JVET_P0057_BDOF_PROF_HARMONIZATION 
        dI1 = (dI1 + dIoffset) >> dIshift;
#endif
#if JVET_P0154_PROF_SAMPLE_OFFSET_CLIPPING
        dI1 = Clip3(-dILimit, dILimit - 1, dI1);
#endif
        dst[w] = (Pel)ClipPel(rightShift(((src0[w] + dI0) * w0 + (src1[w] + dI1) * w1 + offset), shiftNum), clpRng);
      }
      else
        dst[w] = (Pel)ClipPel(rightShift(((src0[w] + dI0) * w0 + src1[w] * w1 + offset), shiftNum), clpRng);

      idx++;
    }

    gradX0 += gradStride;
    gradY0 += gradStride;
    if (l1PROFEnabled)
    {
      gradX1 += gradStride;
      gradY1 += gradStride;
    }
    dst += dstStride;
    src0 += srcStride;
    src1 += srcStride;
  }
}
#endif

template< typename T >
void addAvgCore( const T* src1, int src1Stride, const T* src2, int src2Stride, T* dest, int dstStride, int width, int height, int rshift, int offset, const ClpRng& clpRng )
{
#define ADD_AVG_CORE_OP( ADDR ) dest[ADDR] = ClipPel( rightShift( ( src1[ADDR] + src2[ADDR] + offset ), rshift ), clpRng )
#define ADD_AVG_CORE_INC    \
  src1 += src1Stride;       \
  src2 += src2Stride;       \
  dest +=  dstStride;       \

  SIZE_AWARE_PER_EL_OP( ADD_AVG_CORE_OP, ADD_AVG_CORE_INC );

#undef ADD_AVG_CORE_OP
#undef ADD_AVG_CORE_INC
}

void addBIOAvgCore(const Pel* src0, int src0Stride, const Pel* src1, int src1Stride, Pel *dst, int dstStride, const Pel *gradX0, const Pel *gradX1, const Pel *gradY0, const Pel*gradY1, int gradStride, int width, int height, int tmpx, int tmpy, int shift, int offset, const ClpRng& clpRng)
{
  int b = 0;

  for (int y = 0; y < height; y++)
  {
    for (int x = 0; x < width; x += 4)
    {
      b = tmpx * (gradX0[x] - gradX1[x]) + tmpy * (gradY0[x] - gradY1[x]);
#if !JVET_P0091_REMOVE_BDOF_OFFSET_SHIFT
      b = ((b + 1) >> 1);
#endif
      dst[x] = ClipPel((int16_t)rightShift((src0[x] + src1[x] + b + offset), shift), clpRng);

      b = tmpx * (gradX0[x + 1] - gradX1[x + 1]) + tmpy * (gradY0[x + 1] - gradY1[x + 1]);
#if !JVET_P0091_REMOVE_BDOF_OFFSET_SHIFT
      b = ((b + 1) >> 1);
#endif
      dst[x + 1] = ClipPel((int16_t)rightShift((src0[x + 1] + src1[x + 1] + b + offset), shift), clpRng);

      b = tmpx * (gradX0[x + 2] - gradX1[x + 2]) + tmpy * (gradY0[x + 2] - gradY1[x + 2]);
#if !JVET_P0091_REMOVE_BDOF_OFFSET_SHIFT
      b = ((b + 1) >> 1);
#endif
      dst[x + 2] = ClipPel((int16_t)rightShift((src0[x + 2] + src1[x + 2] + b + offset), shift), clpRng);

      b = tmpx * (gradX0[x + 3] - gradX1[x + 3]) + tmpy * (gradY0[x + 3] - gradY1[x + 3]);
#if !JVET_P0091_REMOVE_BDOF_OFFSET_SHIFT
      b = ((b + 1) >> 1);
#endif
      dst[x + 3] = ClipPel((int16_t)rightShift((src0[x + 3] + src1[x + 3] + b + offset), shift), clpRng);
    }
    dst += dstStride;       src0 += src0Stride;     src1 += src1Stride;
    gradX0 += gradStride; gradX1 += gradStride; gradY0 += gradStride; gradY1 += gradStride;
  }
}

template<bool PAD = true>
void gradFilterCore(Pel* pSrc, int srcStride, int width, int height, int gradStride, Pel* gradX, Pel* gradY, const int bitDepth)
{
  Pel* srcTmp = pSrc + srcStride + 1;
  Pel* gradXTmp = gradX + gradStride + 1;
  Pel* gradYTmp = gradY + gradStride + 1;
#if JVET_P0653_BDOF_PROF_PARA_DEV
  int  shift1 = 6;
#else
  int  shift1 = std::max<int>(6, (bitDepth - 6));
#endif

  for (int y = 0; y < (height - 2 * BIO_EXTEND_SIZE); y++)
  {
    for (int x = 0; x < (width - 2 * BIO_EXTEND_SIZE); x++)
    {
      gradYTmp[x] = ( srcTmp[x + srcStride] >> shift1 ) - ( srcTmp[x - srcStride] >> shift1 );
      gradXTmp[x] = ( srcTmp[x + 1] >> shift1 ) - ( srcTmp[x - 1] >> shift1 );
    }
    gradXTmp += gradStride;
    gradYTmp += gradStride;
    srcTmp += srcStride;
  }

  if (PAD)
  {
  gradXTmp = gradX + gradStride + 1;
  gradYTmp = gradY + gradStride + 1;
  for (int y = 0; y < (height - 2 * BIO_EXTEND_SIZE); y++)
  {
    gradXTmp[-1] = gradXTmp[0];
    gradXTmp[width - 2 * BIO_EXTEND_SIZE] = gradXTmp[width - 2 * BIO_EXTEND_SIZE - 1];
    gradXTmp += gradStride;

    gradYTmp[-1] = gradYTmp[0];
    gradYTmp[width - 2 * BIO_EXTEND_SIZE] = gradYTmp[width - 2 * BIO_EXTEND_SIZE - 1];
    gradYTmp += gradStride;
  }

  gradXTmp = gradX + gradStride;
  gradYTmp = gradY + gradStride;
  ::memcpy(gradXTmp - gradStride, gradXTmp, sizeof(Pel)*(width));
  ::memcpy(gradXTmp + (height - 2 * BIO_EXTEND_SIZE)*gradStride, gradXTmp + (height - 2 * BIO_EXTEND_SIZE - 1)*gradStride, sizeof(Pel)*(width));
  ::memcpy(gradYTmp - gradStride, gradYTmp, sizeof(Pel)*(width));
  ::memcpy(gradYTmp + (height - 2 * BIO_EXTEND_SIZE)*gradStride, gradYTmp + (height - 2 * BIO_EXTEND_SIZE - 1)*gradStride, sizeof(Pel)*(width));
  }
}

void calcBIOSumsCore(const Pel* srcY0Tmp, const Pel* srcY1Tmp, Pel* gradX0, Pel* gradX1, Pel* gradY0, Pel* gradY1, int xu, int yu, const int src0Stride, const int src1Stride, const int widthG, const int bitDepth, int* sumAbsGX, int* sumAbsGY, int* sumDIX, int* sumDIY, int* sumSignGY_GX)
{
#if JVET_P0653_BDOF_PROF_PARA_DEV
  int shift4 = 4;
  int shift5 = 1;
#else
  int shift4 = std::max<int>(4, (bitDepth - 8));
  int shift5 = std::max<int>(1, (bitDepth - 11));
#endif

  for (int y = 0; y < 6; y++)
  {
    for (int x = 0; x < 6; x++)
    {
      int tmpGX = (gradX0[x] + gradX1[x]) >> shift5;
      int tmpGY = (gradY0[x] + gradY1[x]) >> shift5;
      int tmpDI = (int)((srcY1Tmp[x] >> shift4) - (srcY0Tmp[x] >> shift4));
      *sumAbsGX += (tmpGX < 0 ? -tmpGX : tmpGX);
      *sumAbsGY += (tmpGY < 0 ? -tmpGY : tmpGY);
      *sumDIX += (tmpGX < 0 ? -tmpDI : (tmpGX == 0 ? 0 : tmpDI));
      *sumDIY += (tmpGY < 0 ? -tmpDI : (tmpGY == 0 ? 0 : tmpDI));
      *sumSignGY_GX += (tmpGY < 0 ? -tmpGX : (tmpGY == 0 ? 0 : tmpGX));

    }
    srcY1Tmp += src1Stride;
    srcY0Tmp += src0Stride;
    gradX0 += widthG;
    gradX1 += widthG;
    gradY0 += widthG;
    gradY1 += widthG;
  }
}

#if !JVET_P0653_BDOF_PROF_PARA_DEV
void calcBIOParCore(const Pel* srcY0Temp, const Pel* srcY1Temp, const Pel* gradX0, const Pel* gradX1, const Pel* gradY0, const Pel* gradY1, int* dotProductTemp1, int* dotProductTemp2, int* dotProductTemp3, int* dotProductTemp5, int* dotProductTemp6, const int src0Stride, const int src1Stride, const int gradStride, const int widthG, const int heightG, const int bitDepth)
{
  int shift4 = std::max<int>(4, (bitDepth - 8));
  int shift5 = std::max<int>(1, (bitDepth - 11));
  for (int y = 0; y < heightG; y++)
  {
    for (int x = 0; x < widthG; x++)
    {
      int temp = (srcY0Temp[x] >> shift4) - (srcY1Temp[x] >> shift4);
      int tempX = (gradX0[x] + gradX1[x]) >> shift5;
      int tempY = (gradY0[x] + gradY1[x]) >> shift5;
      dotProductTemp1[x] = tempX * tempX;
      dotProductTemp2[x] = tempX * tempY;
      dotProductTemp3[x] = -tempX * temp;
      dotProductTemp5[x] = tempY * tempY;
      dotProductTemp6[x] = -tempY * temp;
    }
    srcY0Temp += src0Stride;
    srcY1Temp += src1Stride;
    gradX0 += gradStride;
    gradX1 += gradStride;
    gradY0 += gradStride;
    gradY1 += gradStride;
    dotProductTemp1 += widthG;
    dotProductTemp2 += widthG;
    dotProductTemp3 += widthG;
    dotProductTemp5 += widthG;
    dotProductTemp6 += widthG;
  }
}
#endif

void calcBlkGradientCore(int sx, int sy, int     *arraysGx2, int     *arraysGxGy, int     *arraysGxdI, int     *arraysGy2, int     *arraysGydI, int     &sGx2, int     &sGy2, int     &sGxGy, int     &sGxdI, int     &sGydI, int width, int height, int unitSize)
{
  int     *Gx2 = arraysGx2;
  int     *Gy2 = arraysGy2;
  int     *GxGy = arraysGxGy;
  int     *GxdI = arraysGxdI;
  int     *GydI = arraysGydI;

  // set to the above row due to JVET_K0485_BIO_EXTEND_SIZE
  Gx2 -= (BIO_EXTEND_SIZE*width);
  Gy2 -= (BIO_EXTEND_SIZE*width);
  GxGy -= (BIO_EXTEND_SIZE*width);
  GxdI -= (BIO_EXTEND_SIZE*width);
  GydI -= (BIO_EXTEND_SIZE*width);

  for (int y = -BIO_EXTEND_SIZE; y < unitSize + BIO_EXTEND_SIZE; y++)
  {
    for (int x = -BIO_EXTEND_SIZE; x < unitSize + BIO_EXTEND_SIZE; x++)
    {
      sGx2 += Gx2[x];
      sGy2 += Gy2[x];
      sGxGy += GxGy[x];
      sGxdI += GxdI[x];
      sGydI += GydI[x];
    }
    Gx2 += width;
    Gy2 += width;
    GxGy += width;
    GxdI += width;
    GydI += width;
  }
}

#if ENABLE_SIMD_OPT_GBI
void removeWeightHighFreq(int16_t* dst, int dstStride, const int16_t* src, int srcStride, int width, int height, int shift, int gbiWeight)
{
  int normalizer = ((1 << 16) + (gbiWeight > 0 ? (gbiWeight >> 1) : -(gbiWeight >> 1))) / gbiWeight;
  int weight0 = normalizer << g_GbiLog2WeightBase;
  int weight1 = (g_GbiWeightBase - gbiWeight)*normalizer;
#define REM_HF_INC  \
  src += srcStride; \
  dst += dstStride; \

#define REM_HF_OP( ADDR )      dst[ADDR] =             (dst[ADDR]*weight0 - src[ADDR]*weight1 + (1<<15))>>16

  SIZE_AWARE_PER_EL_OP(REM_HF_OP, REM_HF_INC);

#undef REM_HF_INC
#undef REM_HF_OP
#undef REM_HF_OP_CLIP
}

void removeHighFreq(int16_t* dst, int dstStride, const int16_t* src, int srcStride, int width, int height)
{
#define REM_HF_INC  \
  src += srcStride; \
  dst += dstStride; \

#define REM_HF_OP( ADDR )      dst[ADDR] =             2 * dst[ADDR] - src[ADDR]

  SIZE_AWARE_PER_EL_OP(REM_HF_OP, REM_HF_INC);

#undef REM_HF_INC
#undef REM_HF_OP
#undef REM_HF_OP_CLIP
}
#endif

template<typename T>
void reconstructCore( const T* src1, int src1Stride, const T* src2, int src2Stride, T* dest, int dstStride, int width, int height, const ClpRng& clpRng )
{
#define RECO_CORE_OP( ADDR ) dest[ADDR] = ClipPel( src1[ADDR] + src2[ADDR], clpRng )
#define RECO_CORE_INC     \
  src1 += src1Stride;     \
  src2 += src2Stride;     \
  dest +=  dstStride;     \

  SIZE_AWARE_PER_EL_OP( RECO_CORE_OP, RECO_CORE_INC );

#undef RECO_CORE_OP
#undef RECO_CORE_INC
}


template<typename T>
void linTfCore( const T* src, int srcStride, Pel *dst, int dstStride, int width, int height, int scale, int shift, int offset, const ClpRng& clpRng, bool bClip )
{
#define LINTF_CORE_OP( ADDR ) dst[ADDR] = ( Pel ) bClip ? ClipPel( rightShift( scale * src[ADDR], shift ) + offset, clpRng ) : ( rightShift( scale * src[ADDR], shift ) + offset )
#define LINTF_CORE_INC  \
  src += srcStride;     \
  dst += dstStride;     \

  SIZE_AWARE_PER_EL_OP( LINTF_CORE_OP, LINTF_CORE_INC );

#undef LINTF_CORE_OP
#undef LINTF_CORE_INC
}

PelBufferOps::PelBufferOps()
{
  addAvg4 = addAvgCore<Pel>;
  addAvg8 = addAvgCore<Pel>;

  reco4 = reconstructCore<Pel>;
  reco8 = reconstructCore<Pel>;

  linTf4 = linTfCore<Pel>;
  linTf8 = linTfCore<Pel>;

  addBIOAvg4      = addBIOAvgCore;
  bioGradFilter   = gradFilterCore;
  calcBIOSums = calcBIOSumsCore;

  copyBuffer = copyBufferCore;
  padding = paddingCore;
#if ENABLE_SIMD_OPT_GBI
  removeWeightHighFreq8 = removeWeightHighFreq;
  removeWeightHighFreq4 = removeWeightHighFreq;
  removeHighFreq8 = removeHighFreq;
  removeHighFreq4 = removeHighFreq;
#endif

  profGradFilter = gradFilterCore <false>;
  applyPROF      = applyPROFCore;
#if !JVET_P0154_PROF_SAMPLE_OFFSET_CLIPPING
  applyBiPROF[1] = applyBiPROFCore;
  applyBiPROF[0] = applyBiPROFCore <false>;
#endif
  roundIntVector = nullptr;
}

PelBufferOps g_pelBufOP = PelBufferOps();

void copyBufferCore(Pel *src, int srcStride, Pel *dst, int dstStride, int width, int height)
{
  int numBytes = width * sizeof(Pel);
  for (int i = 0; i < height; i++)
  {
    memcpy(dst + i * dstStride, src + i * srcStride, numBytes);
  }
}

void paddingCore(Pel *ptr, int stride, int width, int height, int padSize)
{
  /*left and right padding*/
  Pel *ptrTemp1 = ptr;
  Pel *ptrTemp2 = ptr + (width - 1);
  int offset = 0;
  for (int i = 0; i < height; i++)
  {
    offset = stride * i;
    for (int j = 1; j <= padSize; j++)
    {
      *(ptrTemp1 - j + offset) = *(ptrTemp1 + offset);
      *(ptrTemp2 + j + offset) = *(ptrTemp2 + offset);
    }
  }
  /*Top and Bottom padding*/
  int numBytes = (width + padSize + padSize) * sizeof(Pel);
  ptrTemp1 = (ptr - padSize);
  ptrTemp2 = (ptr + (stride * (height - 1)) - padSize);
  for (int i = 1; i <= padSize; i++)
  {
    memcpy(ptrTemp1 - (i * stride), (ptrTemp1), numBytes);
    memcpy(ptrTemp2 + (i * stride), (ptrTemp2), numBytes);
  }
}
template<>
void AreaBuf<Pel>::addWeightedAvg(const AreaBuf<const Pel> &other1, const AreaBuf<const Pel> &other2, const ClpRng& clpRng, const int8_t gbiIdx)
{
  const int8_t w0 = getGbiWeight(gbiIdx, REF_PIC_LIST_0);
  const int8_t w1 = getGbiWeight(gbiIdx, REF_PIC_LIST_1);
  const int8_t log2WeightBase = g_GbiLog2WeightBase;

  const Pel* src0 = other1.buf;
  const Pel* src2 = other2.buf;
  Pel* dest = buf;

  const unsigned src1Stride = other1.stride;
  const unsigned src2Stride = other2.stride;
  const unsigned destStride = stride;
  const int clipbd = clpRng.bd;
  const int shiftNum = std::max<int>(2, (IF_INTERNAL_PREC - clipbd)) + log2WeightBase;
  const int offset = (1 << (shiftNum - 1)) + (IF_INTERNAL_OFFS << log2WeightBase);

#define ADD_AVG_OP( ADDR ) dest[ADDR] = ClipPel( rightShift( ( src0[ADDR]*w0 + src2[ADDR]*w1 + offset ), shiftNum ), clpRng )
#define ADD_AVG_INC     \
    src0 += src1Stride; \
    src2 += src2Stride; \
    dest += destStride; \

  SIZE_AWARE_PER_EL_OP(ADD_AVG_OP, ADD_AVG_INC);

#undef ADD_AVG_OP
#undef ADD_AVG_INC
}

template<>
void AreaBuf<Pel>::rspSignal(std::vector<Pel>& pLUT)
{
  Pel* dst = buf;
  Pel* src = buf;
    for (unsigned y = 0; y < height; y++)
    {
      for (unsigned x = 0; x < width; x++)
      {
        dst[x] = pLUT[src[x]];
      }
      dst += stride;
      src += stride;
    }
}

template<>
void AreaBuf<Pel>::scaleSignal(const int scale, const bool dir, const ClpRng& clpRng)
{
  Pel* dst = buf;
  Pel* src = buf;
  int sign, absval;
  int maxAbsclipBD = (1<<clpRng.bd) - 1;

  if (dir) // forward
  {
    if (width == 1)
    {
      THROW("Blocks of width = 1 not supported");
    }
    else
    {
      for (unsigned y = 0; y < height; y++)
      {
        for (unsigned x = 0; x < width; x++)
        {
          sign = src[x] >= 0 ? 1 : -1;
          absval = sign * src[x];
          dst[x] = (Pel)Clip3(-maxAbsclipBD, maxAbsclipBD, sign * (((absval << CSCALE_FP_PREC) + (scale >> 1)) / scale));
        }
        dst += stride;
        src += stride;
      }
    }
  }
  else // inverse
  {
    for (unsigned y = 0; y < height; y++)
    {
      for (unsigned x = 0; x < width; x++)
      {
        src[x] = (Pel)Clip3((Pel)(-maxAbsclipBD - 1), (Pel)maxAbsclipBD, src[x]);
        sign = src[x] >= 0 ? 1 : -1;
        absval = sign * src[x];
        int val = sign * ((absval * scale + (1 << (CSCALE_FP_PREC - 1))) >> CSCALE_FP_PREC);
        if (sizeof(Pel) == 2) // avoid overflow when storing data
        {
           val = Clip3<int>(-32768, 32767, val);
        }
        dst[x] = (Pel)val;
      }
      dst += stride;
      src += stride;
    }
  }
}

template<>
void AreaBuf<Pel>::addAvg( const AreaBuf<const Pel> &other1, const AreaBuf<const Pel> &other2, const ClpRng& clpRng)
{
  const Pel* src0 = other1.buf;
  const Pel* src2 = other2.buf;
        Pel* dest =        buf;

  const unsigned src1Stride = other1.stride;
  const unsigned src2Stride = other2.stride;
  const unsigned destStride =        stride;
  const int     clipbd      = clpRng.bd;
  const int     shiftNum    = std::max<int>(2, (IF_INTERNAL_PREC - clipbd)) + 1;
  const int     offset      = (1 << (shiftNum - 1)) + 2 * IF_INTERNAL_OFFS;

#if ENABLE_SIMD_OPT_BUFFER && defined(TARGET_SIMD_X86)
  if( ( width & 7 ) == 0 )
  {
    g_pelBufOP.addAvg8( src0, src1Stride, src2, src2Stride, dest, destStride, width, height, shiftNum, offset, clpRng );
  }
  else if( ( width & 3 ) == 0 )
  {
    g_pelBufOP.addAvg4( src0, src1Stride, src2, src2Stride, dest, destStride, width, height, shiftNum, offset, clpRng );
  }
  else
#endif
  {
#define ADD_AVG_OP( ADDR ) dest[ADDR] = ClipPel( rightShift( ( src0[ADDR] + src2[ADDR] + offset ), shiftNum ), clpRng )
#define ADD_AVG_INC     \
    src0 += src1Stride; \
    src2 += src2Stride; \
    dest += destStride; \

    SIZE_AWARE_PER_EL_OP( ADD_AVG_OP, ADD_AVG_INC );

#undef ADD_AVG_OP
#undef ADD_AVG_INC
  }
}

template<>
void AreaBuf<Pel>::toLast( const ClpRng& clpRng )
{
        Pel* src       = buf;
  const uint32_t srcStride = stride;

  const int  clipbd    = clpRng.bd;
  const int  shiftNum  = std::max<int>(2, (IF_INTERNAL_PREC - clipbd));
  const int  offset    = ( 1 << ( shiftNum - 1 ) ) + IF_INTERNAL_OFFS;

  if (width == 1)
  {
    THROW( "Blocks of width = 1 not supported" );
  }
  else if (width&2)
  {
    for ( int y = 0; y < height; y++ )
    {
      for (int x=0 ; x < width; x+=2 )
      {
        src[x + 0] = ClipPel( rightShift( ( src[x + 0] + offset ), shiftNum ), clpRng );
        src[x + 1] = ClipPel( rightShift( ( src[x + 1] + offset ), shiftNum ), clpRng );
      }
      src += srcStride;
    }
  }
  else
  {
    for ( int y = 0; y < height; y++ )
    {
      for (int x=0 ; x < width; x+=4 )
      {
        src[x + 0] = ClipPel( rightShift( ( src[x + 0] + offset ), shiftNum ), clpRng );
        src[x + 1] = ClipPel( rightShift( ( src[x + 1] + offset ), shiftNum ), clpRng );
        src[x + 2] = ClipPel( rightShift( ( src[x + 2] + offset ), shiftNum ), clpRng );
        src[x + 3] = ClipPel( rightShift( ( src[x + 3] + offset ), shiftNum ), clpRng );

      }
      src += srcStride;
    }
  }
}


template<>
void AreaBuf<Pel>::copyClip( const AreaBuf<const Pel> &src, const ClpRng& clpRng )
{
  const Pel* srcp = src.buf;
        Pel* dest =     buf;

  const unsigned srcStride  = src.stride;
  const unsigned destStride = stride;

  if( width == 1 )
  {
    THROW( "Blocks of width = 1 not supported" );
  }
  else
  {
#define RECO_OP( ADDR ) dest[ADDR] = ClipPel( srcp[ADDR], clpRng )
#define RECO_INC        \
    srcp += srcStride;  \
    dest += destStride; \

    SIZE_AWARE_PER_EL_OP( RECO_OP, RECO_INC );

#undef RECO_OP
#undef RECO_INC
  }
}


template<>
void AreaBuf<Pel>::reconstruct( const AreaBuf<const Pel> &pred, const AreaBuf<const Pel> &resi, const ClpRng& clpRng )
{
  const Pel* src1 = pred.buf;
  const Pel* src2 = resi.buf;
        Pel* dest =      buf;

  const unsigned src1Stride = pred.stride;
  const unsigned src2Stride = resi.stride;
  const unsigned destStride =      stride;

#if ENABLE_SIMD_OPT_BUFFER && defined(TARGET_SIMD_X86)
  if( ( width & 7 ) == 0 )
  {
    g_pelBufOP.reco8( src1, src1Stride, src2, src2Stride, dest, destStride, width, height, clpRng );
  }
  else if( ( width & 3 ) == 0 )
  {
    g_pelBufOP.reco4( src1, src1Stride, src2, src2Stride, dest, destStride, width, height, clpRng );
  }
  else
#endif
  {
#define RECO_OP( ADDR ) dest[ADDR] = ClipPel( src1[ADDR] + src2[ADDR], clpRng )
#define RECO_INC        \
    src1 += src1Stride; \
    src2 += src2Stride; \
    dest += destStride; \

    SIZE_AWARE_PER_EL_OP( RECO_OP, RECO_INC );

#undef RECO_OP
#undef RECO_INC
  }
}

template<>
void AreaBuf<Pel>::linearTransform( const int scale, const int shift, const int offset, bool bClip, const ClpRng& clpRng )
{
  const Pel* src = buf;
        Pel* dst = buf;

  if( width == 1 )
  {
    THROW( "Blocks of width = 1 not supported" );
  }
#if ENABLE_SIMD_OPT_BUFFER && defined(TARGET_SIMD_X86)
  else if( ( width & 7 ) == 0 )
  {
    g_pelBufOP.linTf8( src, stride, dst, stride, width, height, scale, shift, offset, clpRng, bClip );
  }
  else if( ( width & 3 ) == 0 )
  {
    g_pelBufOP.linTf4( src, stride, dst, stride, width, height, scale, shift, offset, clpRng, bClip );
  }
#endif
  else
  {
#define LINTF_OP( ADDR ) dst[ADDR] = ( Pel ) bClip ? ClipPel( rightShift( scale * src[ADDR], shift ) + offset, clpRng ) : ( rightShift( scale * src[ADDR], shift ) + offset )
#define LINTF_INC        \
    src += stride;       \
    dst += stride;       \

    SIZE_AWARE_PER_EL_OP( LINTF_OP, LINTF_INC );

#undef RECO_OP
#undef RECO_INC
  }
}

#if ENABLE_SIMD_OPT_BUFFER && defined(TARGET_SIMD_X86)
template<>
void AreaBuf<Pel>::subtract( const Pel val )
{
  ClpRng clpRngDummy;
  linearTransform( 1, 0, -val, false, clpRngDummy );
}
#endif


PelStorage::PelStorage()
{
  for( uint32_t i = 0; i < MAX_NUM_COMPONENT; i++ )
  {
    m_origin[i] = nullptr;
  }
}

PelStorage::~PelStorage()
{
  destroy();
}

void PelStorage::create( const UnitArea &_UnitArea )
{
  create( _UnitArea.chromaFormat, _UnitArea.blocks[0] );
}

void PelStorage::create( const ChromaFormat &_chromaFormat, const Area& _area, const unsigned _maxCUSize, const unsigned _margin, const unsigned _alignment, const bool _scaleChromaMargin )
{
  CHECK( !bufs.empty(), "Trying to re-create an already initialized buffer" );

  chromaFormat = _chromaFormat;

  const uint32_t numCh = getNumberValidComponents( _chromaFormat );

  unsigned extHeight = _area.height;
  unsigned extWidth  = _area.width;

  if( _maxCUSize )
  {
    extHeight = ( ( _area.height + _maxCUSize - 1 ) / _maxCUSize ) * _maxCUSize;
    extWidth  = ( ( _area.width  + _maxCUSize - 1 ) / _maxCUSize ) * _maxCUSize;
  }

  for( uint32_t i = 0; i < numCh; i++ )
  {
    const ComponentID compID = ComponentID( i );
    const unsigned scaleX = ::getComponentScaleX( compID, _chromaFormat );
    const unsigned scaleY = ::getComponentScaleY( compID, _chromaFormat );

    unsigned scaledHeight = extHeight >> scaleY;
    unsigned scaledWidth  = extWidth  >> scaleX;
    unsigned ymargin      = _margin >> (_scaleChromaMargin?scaleY:0);
    unsigned xmargin      = _margin >> (_scaleChromaMargin?scaleX:0);
    unsigned totalWidth   = scaledWidth + 2*xmargin;
    unsigned totalHeight  = scaledHeight +2*ymargin;

    if( _alignment )
    {
      // make sure buffer lines are align
      CHECK( _alignment != MEMORY_ALIGN_DEF_SIZE, "Unsupported alignment" );
      totalWidth = ( ( totalWidth + _alignment - 1 ) / _alignment ) * _alignment;
    }
    uint32_t area = totalWidth * totalHeight;
    CHECK( !area, "Trying to create a buffer with zero area" );

    m_origin[i] = ( Pel* ) xMalloc( Pel, area );
    Pel* topLeft = m_origin[i] + totalWidth * ymargin + xmargin;
    bufs.push_back( PelBuf( topLeft, totalWidth, _area.width >> scaleX, _area.height >> scaleY ) );
  }
}

void PelStorage::createFromBuf( PelUnitBuf buf )
{
  chromaFormat = buf.chromaFormat;

  const uint32_t numCh = ::getNumberValidComponents( chromaFormat );

  bufs.resize(numCh);

  for( uint32_t i = 0; i < numCh; i++ )
  {
    PelBuf cPelBuf = buf.get( ComponentID( i ) );
    bufs[i] = PelBuf( cPelBuf.bufAt( 0, 0 ), cPelBuf.stride, cPelBuf.width, cPelBuf.height );
  }
}

void PelStorage::swap( PelStorage& other )
{
  const uint32_t numCh = ::getNumberValidComponents( chromaFormat );

  for( uint32_t i = 0; i < numCh; i++ )
  {
    // check this otherwise it would turn out to get very weird
    CHECK( chromaFormat                   != other.chromaFormat                  , "Incompatible formats" );
    CHECK( get( ComponentID( i ) )        != other.get( ComponentID( i ) )       , "Incompatible formats" );
    CHECK( get( ComponentID( i ) ).stride != other.get( ComponentID( i ) ).stride, "Incompatible formats" );

    std::swap( bufs[i].buf,    other.bufs[i].buf );
    std::swap( bufs[i].stride, other.bufs[i].stride );
    std::swap( m_origin[i],    other.m_origin[i] );
  }
}

void PelStorage::destroy()
{
  chromaFormat = NUM_CHROMA_FORMAT;
  for( uint32_t i = 0; i < MAX_NUM_COMPONENT; i++ )
  {
    if( m_origin[i] )
    {
      xFree( m_origin[i] );
      m_origin[i] = nullptr;
    }
  }
  bufs.clear();
}

PelBuf PelStorage::getBuf( const ComponentID CompID )
{
  return bufs[CompID];
}

const CPelBuf PelStorage::getBuf( const ComponentID CompID ) const
{
  return bufs[CompID];
}

PelBuf PelStorage::getBuf( const CompArea &blk )
{
  const PelBuf& r = bufs[blk.compID];

  CHECKD( rsAddr( blk.bottomRight(), r.stride ) >= ( ( r.height - 1 ) * r.stride + r.width ), "Trying to access a buf outside of bound!" );

  return PelBuf( r.buf + rsAddr( blk, r.stride ), r.stride, blk );
}

const CPelBuf PelStorage::getBuf( const CompArea &blk ) const
{
  const PelBuf& r = bufs[blk.compID];
  return CPelBuf( r.buf + rsAddr( blk, r.stride ), r.stride, blk );
}

PelUnitBuf PelStorage::getBuf( const UnitArea &unit )
{
  return ( chromaFormat == CHROMA_400 ) ? PelUnitBuf( chromaFormat, getBuf( unit.Y() ) ) : PelUnitBuf( chromaFormat, getBuf( unit.Y() ), getBuf( unit.Cb() ), getBuf( unit.Cr() ) );
}

const CPelUnitBuf PelStorage::getBuf( const UnitArea &unit ) const
{
  return ( chromaFormat == CHROMA_400 ) ? CPelUnitBuf( chromaFormat, getBuf( unit.Y() ) ) : CPelUnitBuf( chromaFormat, getBuf( unit.Y() ), getBuf( unit.Cb() ), getBuf( unit.Cr() ) );
}