void(* filter[4])(uint8_t *dst, int width, float rdiv, float bias, const int *const matrix, const uint8_t *c[], int peak, int radius, int dstride, int stride)
void(* setup[4])(int radius, const uint8_t *c[], const uint8_t *src, int stride, int x, int width, int y, int height, int bpc)