var interlacing = []interlaceScan{
	{8, 0}, // Group 1 : Every 8th. row, starting with row 0.
	{8, 4}, // Group 2 : Every 8th. row, starting with row 4.
	{4, 2}, // Group 3 : Every 4th. row, starting with row 2.
	{2, 1}, // Group 4 : Every 2nd. row, starting with row 1.
}

// uninterlace rearranges the pixels in m to account for interlaced input.
func uninterlace(m *image.Paletted) {
	var nPix []uint8
	dx := m.Bounds().Dx()

	SYS_POLL                   = 209 // { int poll(struct pollfd *fds, u_int nfds, int timeout); }
	SYS___SEMCTL               = 220 // { int __semctl(int semid, int semnum, int cmd, union semun *arg); }
	SYS_SEMGET                 = 221 // { int semget(key_t key, int nsems, int semflg); }
	SYS_SEMOP                  = 222 // { int semop(int semid, struct sembuf *sops, u_int nsops); }

	SYS_REBOOT               = 208 // { int|sys||reboot(int opt, char *bootstr); }
	SYS_POLL                 = 209 // { int|sys||poll(struct pollfd *fds, u_int nfds, int timeout); }
	SYS_SEMGET               = 221 // { int|sys||semget(key_t key, int nsems, int semflg); }
	SYS_SEMOP                = 222 // { int|sys||semop(int semid, struct sembuf *sops, size_t nsops); }
	SYS_SEMCONFIG            = 223 // { int|sys||semconfig(int flag); }

	SYS_REBOOT               = 208 // { int|sys||reboot(int opt, char *bootstr); }
	SYS_POLL                 = 209 // { int|sys||poll(struct pollfd *fds, u_int nfds, int timeout); }
	SYS_SEMGET               = 221 // { int|sys||semget(key_t key, int nsems, int semflg); }
	SYS_SEMOP                = 222 // { int|sys||semop(int semid, struct sembuf *sops, size_t nsops); }
	SYS_SEMCONFIG            = 223 // { int|sys||semconfig(int flag); }

#define SYS_rt_sigreturn	172
#define SYS_rt_sigaction	173
#define SYS_rt_sigprocmask	174
#define SYS_sigaltstack		185
#define SYS_madvise		205
#define SYS_mincore		206
#define SYS_gettid		207
#define SYS_futex		221
#define SYS_sched_getaffinity	223
#define SYS_exit_group		234
#define SYS_timer_create	240
#define SYS_timer_settime	241
#define SYS_timer_delete	244
#define SYS_clock_gettime	246
#define SYS_tgkill		250

	SYS_REBOOT               = 208 // { int|sys||reboot(int opt, char *bootstr); }
	SYS_POLL                 = 209 // { int|sys||poll(struct pollfd *fds, u_int nfds, int timeout); }
	SYS_SEMGET               = 221 // { int|sys||semget(key_t key, int nsems, int semflg); }
	SYS_SEMOP                = 222 // { int|sys||semop(int semid, struct sembuf *sops, size_t nsops); }
	SYS_SEMCONFIG            = 223 // { int|sys||semconfig(int flag); }

	SYS_REBOOT               = 208 // { int|sys||reboot(int opt, char *bootstr); }
	SYS_POLL                 = 209 // { int|sys||poll(struct pollfd *fds, u_int nfds, int timeout); }
	SYS_SEMGET               = 221 // { int|sys||semget(key_t key, int nsems, int semflg); }
	SYS_SEMOP                = 222 // { int|sys||semop(int semid, struct sembuf *sops, size_t nsops); }
	SYS_SEMCONFIG            = 223 // { int|sys||semconfig(int flag); }

	SYS_REBOOT               = 208 // { int|sys||reboot(int opt, char *bootstr); }
	SYS_POLL                 = 209 // { int|sys||poll(struct pollfd *fds, u_int nfds, int timeout); }
	SYS_SEMGET               = 221 // { int|sys||semget(key_t key, int nsems, int semflg); }
	SYS_SEMOP                = 222 // { int|sys||semop(int semid, struct sembuf *sops, size_t nsops); }
	SYS_SEMCONFIG            = 223 // { int|sys||semconfig(int flag); }

	SYS_REBOOT               = 208 // { int|sys||reboot(int opt, char *bootstr); }
	SYS_POLL                 = 209 // { int|sys||poll(struct pollfd *fds, u_int nfds, int timeout); }
	SYS_SEMGET               = 221 // { int|sys||semget(key_t key, int nsems, int semflg); }
	SYS_SEMOP                = 222 // { int|sys||semop(int semid, struct sembuf *sops, size_t nsops); }
	SYS_SEMCONFIG            = 223 // { int|sys||semconfig(int flag); }

	SYS_REBOOT               = 208 // { int|sys||reboot(int opt, char *bootstr); }
	SYS_POLL                 = 209 // { int|sys||poll(struct pollfd *fds, u_int nfds, int timeout); }
	SYS_SEMGET               = 221 // { int|sys||semget(key_t key, int nsems, int semflg); }
	SYS_SEMOP                = 222 // { int|sys||semop(int semid, struct sembuf *sops, size_t nsops); }
	SYS_SEMCONFIG            = 223 // { int|sys||semconfig(int flag); }