1 files changed, 37 insertions, 0 deletions
diff --git a/sys/plio/plbox.x b/sys/plio/plbox.x
new file mode 100644
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--- /dev/null
+++ b/sys/plio/plbox.x
@@ -0,0 +1,37 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <plset.h>
+include <plio.h>
+include "plbox.h"
+
+
+# PL_BOX -- Rasterop between a box as source, and an existing mask as dest.
+# This is a 2-dim operator.  The pl_setplane procedure is used to specify
+# the plane to be modified.
+
+procedure pl_box (pl, x1,y1, x2,y2, rop)
+
+pointer	pl			#I mask descriptor
+int	x1,y1			#I lower left corner of box
+int	x2,y2			#I upper right corner of box
+int	rop			#I rasterop
+
+pointer	sp, ufd
+extern	pl_ubox()
+
+begin
+	call plvalid (pl)
+	call smark (sp)
+	call salloc (ufd, LEN_BOXDES, TY_STRUCT)
+
+	B_PL(ufd) = pl
+	B_X1(ufd) = max(1, min(PL_AXLEN(pl,1), x1))
+	B_Y1(ufd) = max(1, min(PL_AXLEN(pl,2), y1))
+	B_X2(ufd) = max(1, min(PL_AXLEN(pl,1), x2))
+	B_Y2(ufd) = max(1, min(PL_AXLEN(pl,2), y2))
+	B_PV(ufd) = 1
+
+	call pl_regionrop (pl, pl_ubox, ufd, y1, y2, rop)
+
+	call sfree (sp)
+end