uint8_t *black_data[4]; ///< buffer used to fill padded lines
int black_linesize[4];
void (*lowpass_line)(uint8_t *dstp, ptrdiff_t width, const uint8_t *srcp,
uint8_t *black_data[4]; ///< buffer used to fill padded lines
int black_linesize[4];
void (*lowpass_line)(uint8_t *dstp, ptrdiff_t width, const uint8_t *srcp,