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diff --git a/sys/plio/plrop.x b/sys/plio/plrop.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include <plset.h>
+include	<plio.h>
+
+# PL_ROP -- Perform a rasterop operation from the source mask to the
+# destination mask at the given offsets.  The source and destination need
+# not be the same size or dimensionality, but out of bounds references are
+# not permitted.  If the source is of lesser dimensionality than the
+# indicated section of the destination, then the source will be rewound
+# and reread as necessary to operate upon the entire destination subregion,
+# e.g., a line source mask may be applied to successive lines of a plane,
+# or a plane mask may be applied to successive planes of a 3D mask.
+# The source and destination masks may be the same if desired, but if the 
+# source and destination regions overlap feedback may occur (this could be
+# fixed).  With some rasterops, e.g, PIX_SET or PIX_CLR, no source mask is
+# required, and pl_src=NULL is permitted.
+
+procedure pl_rop (pl_src, vs_src, pl_dst, vs_dst, vn, rop)
+
+pointer	pl_src			#I source mask or NULL
+long	vs_src[PL_MAXDIM]	#I start vector in source mask
+pointer	pl_dst			#I destination mask (required)
+long	vs_dst[PL_MAXDIM]	#I start vector in destination mask
+long	vn[PL_MAXDIM]		#I vector giving subregion size
+long	rop			#I rasterop
+
+bool	need_src
+pointer	sp, ll_out, ll_src, ll_dst, ol_src, ol_dst
+long	v_src[PL_MAXDIM], v_dst[PL_MAXDIM]
+long	ve_src[PL_MAXDIM], ve_dst[PL_MAXDIM]
+
+int	plloop()
+pointer	pl_access()
+errchk	syserr, plvalid, plsslv, pl_access
+
+begin
+	call plvalid (pl_dst)
+	need_src = R_NEED_SRC(rop)
+	if (need_src && pl_src == NULL)
+	    call syserr (SYS_PLNULLSRC)
+
+	call smark (sp)
+	call salloc (ll_out, LL_MAXLEN(pl_dst), TY_SHORT)
+
+	# Initialize the N-dimensional loop counters.
+	call plsslv (pl_dst, vs_dst, vn, v_dst, ve_dst)
+	if (need_src)
+	    call plsslv (pl_src, vs_src, vn, v_src, ve_src)
+	else
+	    ll_src = ll_out	# any valid pointer will do
+
+	# Perform the operation.
+	ol_dst = -1
+	repeat {
+	    # Get a line from each mask.  The DST linelist is required,
+	    # even if R_NEED_DST(rop) is false, because the DST size
+	    # parameters determine the size of the output list, and the
+	    # rop may only apply to a portion of the DST list.
+
+	    ll_dst = pl_access (pl_dst, v_dst)
+	    if (need_src)
+		ll_src = pl_access (pl_src, v_src)
+
+	    # Perform the rasterop operation upon one line of the mask.
+	    # Note that if successive mask lines point to the same encoded
+	    # line list, we only have to compute the result once.
+
+	    if (ll_src != ol_src || ll_dst != ol_dst) {
+		call pl_linerop (Mems[ll_src], vs_src[1], PL_MAXVAL(pl_src),
+				 Mems[ll_dst], vs_dst[1], PL_MAXVAL(pl_dst),
+				 Mems[ll_out], vn[1], rop)
+		ol_src = ll_src
+		ol_dst = ll_dst
+	    }
+
+	    # Update the affected line of the destination mask.
+	    call pl_update (pl_dst, v_dst, Mems[ll_out])
+
+	    # If the end of the input mask is reached, rewind it and go again.
+	    if (need_src)
+		if (plloop (v_src,vs_src,ve_src,PL_NAXES(pl_src)) == LOOP_DONE)
+		    call amovi (vs_src, v_src, PL_NAXES(pl_src))
+
+	} until (plloop (v_dst, vs_dst, ve_dst, PL_NAXES(pl_dst)) == LOOP_DONE)
+
+	# Compress the mask if excessive free space has accumulated.
+	if (PL_NEEDCOMPRESS(pl_dst))
+	    call pl_compress (pl_dst)
+
+	call sfree (sp)
+end