conv.h

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#ifndef _CONV_H_
#define _CONV_H_

#include "basic.h"


typedef struct
{
    float *Coeff;
    int Delay;
    int Length;
} filter;

typedef float (*boundaryext)(const float*, int, int, int);


void SampledConv1D(float *Dest, int DestStride, const float *Src,
    int SrcStride, filter Filter, boundaryext Boundary, int N,
    int nStart, int nStep, int nEnd);

void SeparableConv2D(float *Dest, float *Buffer, const float *Src,
    filter FilterX, filter FilterY, boundaryext Boundary,
    int Width, int Height, int NumChannels);

filter MakeFilter(float *Coeff, int Delay, int Length);

filter AllocFilter(int Delay, int Length);

int IsNullFilter(filter Filter);

filter GaussianFilter(double Sigma, int R);

boundaryext GetBoundaryExt(const char *Boundary);


/* Macro definitions */

#define FreeFilter(Filter)  (Free((Filter).Coeff))

#define Conv1D(Dest, DestStride, Src, SrcStride, Filter, Boundary, N) \
    (SampledConv1D(Dest, DestStride, Src, SrcStride, Filter, Boundary, N, \
    0, 1, N - 1))


extern const filter NullFilter;

#endif /* _CONV_H_ */