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/** \file     RdCost.cpp

    \brief    RD cost computation class

*/

#define DONT_UNDEF_SIZE_AWARE_PER_EL_OP

#include "RdCost.h"

namespace vvdec

{

RdCost::RdCost( bool enableOpt )

{

  m_afpDistortFunc[DF_SAD8   ] = RdCost::xGetSAD8;

  m_afpDistortFunc[DF_SAD16  ] = RdCost::xGetSAD16;

  m_afpDistortFuncX5[DF_SAD8   ] = RdCost::xGetSAD8X5;

  m_afpDistortFuncX5[DF_SAD16  ] = RdCost::xGetSAD16X5;

  if( enableOpt )

  {

#if ENABLE_SIMD_OPT_DIST

#ifdef TARGET_SIMD_X86

    initRdCostX86();

#endif

#ifdef TARGET_SIMD_ARM

    initRdCostARM();

#endif

#endif

  }

}

RdCost::~RdCost()

{

}

void RdCost::setDistParam( DistParam &rcDP, const Pel* pOrg, const Pel* piRefY, ptrdiff_t iOrgStride, ptrdiff_t iRefStride, int bitDepth, int width, int height, int subShiftMode )

{

  rcDP.bitDepth   = bitDepth;

  rcDP.org.buf    = pOrg;

  rcDP.org.stride = iOrgStride;

  rcDP.org.width  = width;

  rcDP.org.height = height;

  rcDP.cur.buf    = piRefY;

  rcDP.cur.stride = iRefStride;

  rcDP.cur.width  = width;

  rcDP.cur.height = height;

  rcDP.subShift   = subShiftMode;

  rcDP.distFunc   = m_afpDistortFunc[getLog2( width ) - 3];

  rcDP.distFuncX5 = m_afpDistortFuncX5[getLog2( width ) - 3];

}

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

// Distortion functions

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

// --------------------------------------------------------------------------------------------------------------------

// SAD

// --------------------------------------------------------------------------------------------------------------------

Distortion RdCost::xGetSAD8( const DistParam& rcDtParam )

{

  const Pel* piOrg      = rcDtParam.org.buf;

  const Pel* piCur      = rcDtParam.cur.buf;

  int  iRows            = rcDtParam.org.height;

  int  iSubShift        = rcDtParam.subShift;

  int  iSubStep         = ( 1 << iSubShift );

  ptrdiff_t iStrideCur       = rcDtParam.cur.stride * iSubStep;

  ptrdiff_t iStrideOrg       = rcDtParam.org.stride * iSubStep;

  Distortion uiSum = 0;

  for( ; iRows != 0; iRows-=iSubStep )

  {

    uiSum += abs( piOrg[0] - piCur[0] );

    uiSum += abs( piOrg[1] - piCur[1] );

    uiSum += abs( piOrg[2] - piCur[2] );

    uiSum += abs( piOrg[3] - piCur[3] );

    uiSum += abs( piOrg[4] - piCur[4] );

    uiSum += abs( piOrg[5] - piCur[5] );

    uiSum += abs( piOrg[6] - piCur[6] );

    uiSum += abs( piOrg[7] - piCur[7] );

    piOrg += iStrideOrg;

    piCur += iStrideCur;

  }

  uiSum <<= iSubShift;

  return uiSum;

}

Distortion RdCost::xGetSAD16( const DistParam& rcDtParam )

{

  const Pel* piOrg      = rcDtParam.org.buf;

  const Pel* piCur      = rcDtParam.cur.buf;

  int  iRows            = rcDtParam.org.height;

  int  iSubShift        = rcDtParam.subShift;

  int  iSubStep         = ( 1 << iSubShift );

  ptrdiff_t iStrideCur       = rcDtParam.cur.stride * iSubStep;

  ptrdiff_t iStrideOrg       = rcDtParam.org.stride * iSubStep;

  Distortion uiSum = 0;

  for( ; iRows != 0; iRows -= iSubStep )

  {

    uiSum += abs( piOrg[0] - piCur[0] );

    uiSum += abs( piOrg[1] - piCur[1] );

    uiSum += abs( piOrg[2] - piCur[2] );

    uiSum += abs( piOrg[3] - piCur[3] );

    uiSum += abs( piOrg[4] - piCur[4] );

    uiSum += abs( piOrg[5] - piCur[5] );

    uiSum += abs( piOrg[6] - piCur[6] );

    uiSum += abs( piOrg[7] - piCur[7] );

    uiSum += abs( piOrg[8] - piCur[8] );

    uiSum += abs( piOrg[9] - piCur[9] );

    uiSum += abs( piOrg[10] - piCur[10] );

    uiSum += abs( piOrg[11] - piCur[11] );

    uiSum += abs( piOrg[12] - piCur[12] );

    uiSum += abs( piOrg[13] - piCur[13] );

    uiSum += abs( piOrg[14] - piCur[14] );

    uiSum += abs( piOrg[15] - piCur[15] );

    piOrg += iStrideOrg;

    piCur += iStrideCur;

  }

  uiSum <<= iSubShift;

  return uiSum;

}

void RdCost::xGetSAD8X5(const DistParam& rcDtParam, Distortion* cost, bool isCalCentrePos) {

  DistParam rcDtParamTmp0 = rcDtParam;

  DistParam rcDtParamTmp1 = rcDtParam;

  rcDtParamTmp1.org.buf += 1;

  rcDtParamTmp1.cur.buf -= 1;

  DistParam rcDtParamTmp2 = rcDtParam;

  rcDtParamTmp2.org.buf += 2;

  rcDtParamTmp2.cur.buf -= 2;

  DistParam rcDtParamTmp3 = rcDtParam;

  rcDtParamTmp3.org.buf += 3;

  rcDtParamTmp3.cur.buf -= 3;

  DistParam rcDtParamTmp4 = rcDtParam;

  rcDtParamTmp4.org.buf += 4;

  rcDtParamTmp4.cur.buf -= 4;

  cost[0] = (RdCost::xGetSAD8(rcDtParamTmp0)) >> 1;

  cost[1] = (RdCost::xGetSAD8(rcDtParamTmp1)) >> 1;

  if (isCalCentrePos) cost[2] = (RdCost::xGetSAD8(rcDtParamTmp2)) >> 1;

  cost[3] = (RdCost::xGetSAD8(rcDtParamTmp3)) >> 1;

  cost[4] = (RdCost::xGetSAD8(rcDtParamTmp4)) >> 1;

}

void RdCost::xGetSAD16X5(const DistParam& rcDtParam, Distortion* cost, bool isCalCentrePos) {

  DistParam rcDtParamTmp0 = rcDtParam;

  DistParam rcDtParamTmp1 = rcDtParam;

  rcDtParamTmp1.org.buf += 1;

  rcDtParamTmp1.cur.buf -= 1;

  DistParam rcDtParamTmp2 = rcDtParam;

  rcDtParamTmp2.org.buf += 2;

  rcDtParamTmp2.cur.buf -= 2;

  DistParam rcDtParamTmp3 = rcDtParam;

  rcDtParamTmp3.org.buf += 3;

  rcDtParamTmp3.cur.buf -= 3;

  DistParam rcDtParamTmp4 = rcDtParam;

  rcDtParamTmp4.org.buf += 4;

  rcDtParamTmp4.cur.buf -= 4;

  cost[0] = (RdCost::xGetSAD16(rcDtParamTmp0)) >> 1;

  cost[1] = (RdCost::xGetSAD16(rcDtParamTmp1)) >> 1;

  if (isCalCentrePos) cost[2] = (RdCost::xGetSAD16(rcDtParamTmp2)) >> 1;

  cost[3] = (RdCost::xGetSAD16(rcDtParamTmp3)) >> 1;

  cost[4] = (RdCost::xGetSAD16(rcDtParamTmp4)) >> 1;

}

}