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diff --git a/lib/plio.h b/lib/plio.h
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+# PLIO.H -- Package internal global defines for the Pixel List package.
+
+# Size limiting definitons
+define	PL_MAXDIM	7		# maximum mask dimensionality
+define	PL_MAGICVAL	2014		# identifies mask and version no.
+define	PL_LLBUFLEN	512		# initial llbuf size
+define	PL_STARTINC	512		# starting llbuf increment on overflow
+define	PL_MAXINC	4096		# maximum increment per resize
+define	PL_MAXFREE	40		# max percent free (wasted) space
+define	PL_MAXDEPTH	27		# max mask depth, bits
+define	PL_DEFMAXLINE	1024		# default max elements per [lr]list
+
+# Main PL descriptor.
+define	LEN_PLDES	28
+define	MLO		3		# must update PLSET.H too if changed
+
+define	PL_MAGIC	Memi[$1]	# magic / version no.
+define	PL_PRIVATE1	Memi[$1+1]	# private data for client
+define	PL_PRIVATE2	Memi[$1+2]	# more private data for client
+define	PL_MAXLINE	Memi[$1+MLO]	# max elements per [lr]list [PLSET.H]
+define	PL_MAXVAL	Memi[$1+4]	# max pixel value (2**N - 1)
+define	PL_NAXES	Memi[$1+5]	# dimensionality
+define	PL_AXLEN	Memi[$1+6+$2-1]	# length of each axis
+define	PL_PLANE	Memi[$1+13+$2-1] # active plane (pl_setplane)
+define	PL_LLBP		Memi[$1+20]	# line list bufptr
+define	PL_LLOP		Memi[$1+21]	# next location in llbuf
+define	PL_LLLEN	Memi[$1+22]	# current llbuf length
+define	PL_LLFREE	Memi[$1+23]	# amount of free space in list
+define	PL_LLNUPDATES	Memi[$1+24]	# number of list modifications
+define	PL_LLINC	Memi[$1+25]	# current llbuf increment on overflow
+define	PL_NLP		Memi[$1+26]	# number of line pointers
+define	PL_LPP		Memi[$1+27]	# ptr to array of LL offsets
+
+define	PM_REFIM	PL_PRIVATE1($1)	# reference image
+define	PM_MAPXY	PL_PRIVATE2($1)	# need to transform coords
+
+# Handy macros.
+define	Ref		(PL_LLBP($1)+$2)# llbuf offset -> pointer
+define	LL		Mems[Ref($1,$2)]# pointer -> array reference
+define	PL_LP		Memi[PL_LPP($1)+$2-1]
+define	PL_EMPTYLINE	0		# llbuf offset of the empty line
+define	PL_NEEDCOMPRESS	((PL_LLFREE($1)*100/PL_LLOP($1))>PL_MAXFREE)
+define	LL_MAXLEN	PL_MAXLINE($1)
+define	RL_MAXLEN	(PL_MAXLINE($1)*3)
+define	MV		((2**min($1,27))-1)
+
+# Handy rasterop decoding macros.
+define	R_OPCODE		and($1,17B)
+define	R_DATA			($1/100B)
+define	R_NEED_DST		(and(xor(($1)/2,($1)),5)!=0)
+define	R_NEED_SRC		(and(xor(($1)/4,($1)),3)!=0)
+define	R_NOTDST		(and($1,6)==4)
+define	R_NOTSRC		(and($1,6)==2)
+
+# Internal rasterop definitions (PIX_SRC=14B, PIX_DST=12B, CLR=0B, SET=17B).
+define	PIX_NOTSRC		03B
+define	PIX_NOTDST		05B
+define	PIX_SRC_AND_DST		10B
+define	PIX_SRC_OR_DST		16B
+define	PIX_SRC_XOR_DST		06B
+define	PIX_SRC_AND_NOTDST	04B
+define	PIX_SRC_OR_NOTDST	15B
+define	PIX_NOTSRC_AND_DST	02B
+define	PIX_NOTSRC_OR_DST	13B
+define	PIX_NOT_SRC_AND_DST	07B
+define	PIX_NOT_SRC_OR_DST	01B
+define	PIX_NOT_SRC_XOR_DST	11B
+
+
+# Macro defines for the line list data format.
+
+# ----- Old/original line list header definitions.  This version uses a
+# ----- three element header, but the maximum values are limited to 32K by
+# ----- the use of type short.
+
+# Line list definitions (accessed as a short integer array).
+define	OLL_NREF	$1[1]		# number of references
+define	OLL_BLEN	$1[2]		# length of buffer containing LL
+define	OLL_LEN		$1[3]		# length of encoded line list
+define	OLL_FIRST	4		# first data range entry in list
+
+# Line list definitions (accessed via a short integer pointer).
+define	OLP_NREF	Mems[$1]	# number of references
+define	OLP_BLEN	Mems[$1+1]	# length of buffer containing LL
+define	OLP_LEN		Mems[$1+2]	# length of encoded line list
+define	OLP_FIRST	3		# first data range entry in list
+
+
+# ----- New format line list header definitions.  This version uses a 
+# ----- variable length header and a version number to allow new encodings
+# ----- while retaining backwards compatibility.
+
+define  LL_CURVERSION	(-100)		# LL version code (must be negative)
+define	LL_OLDFORMAT	(LL_VERSION($1) > 0)
+define	LL_CURHDRLEN	7
+
+# Line list definitions (accessed as a short integer array).
+define	LL_NREFS	$1[1]		# number of references
+define	LL_HDRLEN	$1[2]		# length of encoded line list
+define	LL_VERSION	$1[3]		# version number (negative)
+define	LL_LENLO	$1[4]		# length of encoded line list
+define	LL_LENHI	$1[5]		# length of encoded line list
+define	LL_BLENLO	$1[6]		# length of LL buffer
+define	LL_BLENHI	$1[7]		# length of LL buffer
+
+# Handy line list macros.
+define	LL_NREF		(int(LL_NREFS($1)))
+define	LL_BLEN		((int(LL_BLENHI($1)))*32768+(int(LL_BLENLO($1))))
+define	LL_SETBLEN	LL_BLENLO($1)=mod($2,32768); LL_BLENHI($1)=($2)/32768
+define	LL_LEN		((int(LL_LENHI($1)))*32768+(int(LL_LENLO($1))))
+define	LL_SETLEN	LL_LENLO($1)=mod($2,32768); LL_LENHI($1)=($2)/32768
+define	LL_FIRST	(LL_HDRLEN($1)+1)
+
+# Line list definitions (accessed as a short integer pointer).
+define	LP_NREFS	Mems[$1]	# number of references
+define	LP_HDRLEN	Mems[$1+1]	# length of encoded line list
+define	LP_VERSION	Mems[$1+2]	# version number (negative)
+define	LP_LENLO	Mems[$1+3]	# length of encoded line list
+define	LP_LENHI	Mems[$1+4]	# length of encoded line list
+define	LP_BLENLO	Mems[$1+5]	# length of LL buffer
+define	LP_BLENHI	Mems[$1+6]	# length of LL buffer
+
+# Handy line list pointer macros.
+define	LP_NREF		(int(LP_NREFS($1)))
+define	LP_BLEN		(int(LP_BLENHI($1))*32768+int(LP_BLENLO($1)))
+define	LP_SETBLEN	LP_BLENLO($1)=mod($2,32768); LP_BLENHI($1)=($2)/32768
+define	LP_LEN		(int(LP_LENHI($1))*32768+int(LP_LENLO($1)))
+define	LP_SETLEN	LP_LENLO($1)=mod($2,32768); LP_LENHI($1)=($2)/32768
+define	LP_FIRST	(($1)+LP_HDRLEN($1))
+
+
+# Packed instruction decoding.
+define	I_SHIFT		10000B		# shift to encode/decode data bits
+define	I_DATA		and(int($1),7777B)	# extract data
+define	I_OPCODE	(($1)/10000B)	# extract opcode value
+define	I_OPCODEMASK	and(int($1),70000B)	# extract opcode mask
+define	I_DATAMAX	7777B		# max data field value
+define	I_PVMAX		777777777B	# max mask pixel value (27 bits)
+
+# LL instruction opcodes.
+define	I_ZN		0		# N zeros
+define	I_HN		4		# N high values
+define	I_PN		5		# N-1 zeros and 1 high value
+define	I_SH		1		# set high value (2 words)
+define	I_IH		2		# increment high value
+define	I_DH		3		# decrement high value
+define	I_IS		6		# increment and output 1 high value
+define	I_DS		7		# decrement and output 1 high value
+
+# The LL instruction opcodes again, but as bitmasks this time.
+define	M_ZN		00000B
+define	M_HN		40000B
+define	M_PN		50000B
+define	M_SH		10000B
+define	M_IH		20000B
+define	M_DH		30000B
+define	M_IS		60000B
+define	M_DS		70000B
+
+# The following bit is set if the instruction changes the current position.
+define	M_MOVE		40000B
+
+# PL external format descriptor (with some extra space).
+define	LEN_PLEXTERN	20
+define	PLE_MAGIC	Memi[$1]	# usual magic value
+define	PLE_NAXES	Memi[$1+1]	# number of axes 
+define	PLE_AXLEN	Memi[$1+2+$2-1]	# length of each axis
+define	PLE_LLOP	Memi[$1+9]	# next location in llbuf
+define	PLE_LLLEN	Memi[$1+10]	# length of llbuf
+define	PLE_NLP		Memi[$1+11]	# number of line pointers
+define	PLE_NLPX	Memi[$1+12]	# length of compressed LP array
+define	PLE_EXLEN	Memi[$1+13]	# length of full PLEXTERN structure
+define	PLE_FLAGS	Memi[$1+14]	# flags for type of encoding
+define	PLE_MAXLINE	Memi[$1+15]	# max elements per [lr]list
+define	PLE_MAXVAL	Memi[$1+16]	# max pixel value
+
+# PLIO mask savefile descriptor.
+define	PLIO_SVMAGIC	123126B		# "SV"
+define	LEN_SVDES	3
+define	SV_MAGIC	Memi[$1]	# identifies file type
+define	SV_TITLELEN	Memi[$1+1]	# title string length, including EOS
+define	SV_MASKLEN	Memi[$1+2]	# encoded mask length, shorts
+
+# Internal symbols.
+define	LOOP_DONE	1
+define	LOOP_AGAIN	0