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1 files changed, 32 insertions, 0 deletions

diff --git a/sys/plio/plclear.x b/sys/plio/plclear.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<plio.h>
+
+# PL_CLEAR -- Clear a mask.  The entire surface is cleared.  This is equivalent
+# to a full surface pl_rop with rop=PIX_CLR, but is more convenient and can be
+# implemented more efficiently since the entire surface is cleared.
+
+procedure pl_clear (pl)
+
+pointer	pl			#I mask descriptor
+
+pointer	lp
+int	n_len, i
+errchk	realloc
+
+begin
+	# Clear the line list buffer.
+	lp = Ref (pl, PL_EMPTYLINE)
+	PL_LLOP(pl) = LP_BLEN(lp)
+	LP_NREFS(lp) = PL_NLP(pl)
+
+	do i = 1, PL_NLP(pl)
+	    PL_LP(pl,i) = PL_EMPTYLINE
+	    
+	n_len = PL_LLBUFLEN
+	call realloc (PL_LLBP(pl), n_len, TY_SHORT)
+
+	PL_LLLEN(pl) = n_len
+	PL_LLFREE(pl) = 0
+	PL_LLNUPDATES(pl) = 0
+end