Initial commit

1 files changed, 35 insertions, 0 deletions

diff --git a/sys/imio/tf/imgl1s.x b/sys/imio/tf/imgl1s.x
new file mode 100644
index 00000000..bd226f31
--- /dev/null
+++ b/sys/imio/tf/imgl1s.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	<imio.h>
+
+# IMGL1? -- Get a line from an apparently one dimensional image.  If there
+# is only one input buffer, no image section, we are not referencing out of
+# bounds, and no datatype conversion needs to be performed, directly access
+# the pixels to reduce the overhead per line.
+
+pointer procedure imgl1s (im)
+
+pointer	im
+int	fd, nchars
+long	offset
+pointer	bp, imggss(), freadp()
+errchk	imopsf
+
+begin
+	repeat {
+	    if (IM_FAST(im) == YES && IM_PIXTYPE(im) == TY_SHORT) {
+		fd = IM_PFD(im)
+		if (fd == NULL) {
+		    call imopsf (im)
+		    next
+		}
+
+		offset = IM_PIXOFF(im)
+		nchars = IM_PHYSLEN(im,1) * SZ_SHORT
+		ifnoerr (bp = (freadp (fd, offset, nchars) - 1) / SZ_SHORT + 1)
+		    return (bp)
+	    }
+	    return (imggss (im, long(1), IM_LEN(im,1), 1))
+	}
+end