void(* vp6_filter_diag4)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride, const int16_t *h_weights, const int16_t *v_weights)
void(* edge_filter_ver)(uint8_t *yuv, ptrdiff_t stride, int t)
void(* edge_filter_hor)(uint8_t *yuv, ptrdiff_t stride, int t)