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/** \file     RdCost.h
    \brief    RD cost computation classes (header)
*/

#pragma once

#include "CommonDef.h"
#include "Unit.h"
#include "Buffer.h"

#include <math.h>

namespace vvdec
{
using namespace x86_simd;
using namespace arm_simd;

class DistParam;
class EncCfg;

// ====================================================================================================================
// Type definition
// ====================================================================================================================

// for function pointer
typedef Distortion (*FpDistFunc) (const DistParam&);
typedef void (*FpDistFuncX5)(const DistParam&, Distortion*, bool);

// ====================================================================================================================
// Class definition
// ====================================================================================================================

/// distortion parameter class
class DistParam
{
public:
  CPelBuf               org;
  CPelBuf               cur;
  FpDistFunc            distFunc;
  FpDistFuncX5          distFuncX5;
  int                   bitDepth;

  // (vertical) subsampling shift (for reducing complexity)
  // - 0 = no subsampling, 1 = even rows, 2 = every 4th, etc.
  int                   subShift;
  DistParam() :
  org(), cur(), bitDepth( 0 ), subShift( 0 )
  { }
};

/// RD cost computation class
class RdCost
{
private:
  // for distortion

  static FpDistFunc m_afpDistortFunc[DF_TOTAL_FUNCTIONS]; // [eDFunc]
  static FpDistFuncX5 m_afpDistortFuncX5[DF_TOTAL_FUNCTIONS]; // [eDFunc]

public:

  RdCost();
  ~RdCost();

  static void setDistParam( DistParam &rcDP, const Pel* pOrg, const Pel* piRefY, ptrdiff_t iOrgStride, ptrdiff_t iRefStride, int bitDepth, int width, int height, int subShiftMode = 0 );


  static Distortion xGetSAD8          ( const DistParam& pcDtParam );
  static Distortion xGetSAD16         ( const DistParam& pcDtParam );
  static void       xGetSAD8X5        ( const DistParam& pcDtParam, Distortion* cost, bool isCalCentrePos );
  static void       xGetSAD16X5       ( const DistParam& pcDtParam, Distortion* cost, bool isCalCentrePos );

private:

#ifdef TARGET_SIMD_X86
  void initRdCostX86();
  template<X86_VEXT vext>
  void _initRdCostX86();
#endif

#ifdef TARGET_SIMD_ARM
  void initRdCostARM();
  template<ARM_VEXT vext>
  void _initRdCostARM();
#endif   // TARGET_SIMD_ARM

};   // END CLASS DEFINITION RdCost

}   // namespace vvdec