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/** \file     MatrixIntraPrediction.h
\brief    matrix-based intra prediction class (header)
*/

#pragma once

#include "Unit.h"

namespace vvdec
{

static const int MIP_MAX_INPUT_SIZE             =  8;
static const int MIP_MAX_REDUCED_OUTPUT_SAMPLES = 64;


namespace Mip
{
  class PredictorMIP
  {
  public:
    PredictorMIP();
    void             deriveBoundaryData(const CPelBuf& src, const Area& block, const int bitDepth);
    void             getPrediction     (Pel* const result, const int modeIdx, const bool transpose, const int bitDepth);
  private:
    Pel m_reducedBoundary          [MIP_MAX_INPUT_SIZE]; // downsampled             boundary of a block
    Pel m_reducedBoundaryTransposed[MIP_MAX_INPUT_SIZE]; // downsampled, transposed boundary of a block

    int                                    m_inputOffset;
    int                                    m_inputOffsetTransp;
    Pel m_refSamplesTop            [MIP_MAX_WIDTH       ];             // top  reference samples for upsampling
    Pel m_refSamplesLeft           [MIP_MAX_HEIGHT     ];            // left reference samples for upsampling
    Size m_blockSize;
    int  m_sizeId;
    int  m_reducedBdrySize;
    int  m_reducedPredSize;
    unsigned int m_upsmpFactorHor;
    unsigned int m_upsmpFactorVer;

    void initPredBlockParams(const Size& block);

    static void boundaryDownsampling1D(Pel* reducedDst, const Pel* const fullSrc, const SizeType srcLen, const SizeType dstLen);

    void predictionUpsampling( Pel* const dst, const Pel* const src ) const;
    static void predictionUpsampling1D( Pel* const dst, const Pel* const src, const Pel* const bndry,
                                        const SizeType srcSizeUpsmpDim, const SizeType srcSizeOrthDim,
                                        const SizeType srcStep, const SizeType srcStride,
                                        const SizeType dstStep, const SizeType dstStride,
                                        const SizeType bndryStep,
                                        const unsigned int upsmpFactor );

    const uint8_t* getMatrixData(const int modeIdx) const;


    void computeReducedPred( Pel* const result, const Pel* const input,
                             const uint8_t* matrix,
                             const bool transpose, const int bitDepth );
  };
}

class MatrixIntraPrediction
{
public:
  MatrixIntraPrediction();

  Mip::PredictorMIP m_predictorMip;
  void prepareInputForPred( const CPelBuf &src, const Area& puArea, const int bitDepth, const ComponentID compId );
  void predBlock( const Size &puSize, const int modeIdx, PelBuf &dst, const bool transpose, const int bitDepth, const ComponentID compId, Pel* const resultMip );
private:
  ComponentID m_component = MAX_NUM_COMPONENT;
};

}