From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 sys/imio/imgl2.gx | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 sys/imio/imgl2.gx

(limited to 'sys/imio/imgl2.gx')

diff --git a/sys/imio/imgl2.gx b/sys/imio/imgl2.gx
new file mode 100644
index 00000000..8dfd1751
--- /dev/null
+++ b/sys/imio/imgl2.gx
@@ -0,0 +1,47 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<imhdr.h>
+include	<imio.h>
+
+# IMGL2? -- Get a line from an apparently two 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 imgl2$t (im, linenum)
+
+pointer	im			# image header pointer
+int	linenum			# line to be read
+
+int	fd, nchars
+long	vs[2], ve[2], offset
+pointer	bp, imggs$t(), freadp()
+errchk	imopsf, imerr
+
+begin
+	repeat {
+	    if (IM_FAST(im) == YES && IM_PIXTYPE(im) == TY_PIXEL) {
+		fd = IM_PFD(im)
+		if (fd == NULL) {
+		    call imopsf (im)
+		    next
+		}
+		if (linenum < 1 || linenum > IM_LEN(im,2))
+		    call imerr (IM_NAME(im), SYS_IMREFOOB)
+
+		offset = (linenum - 1) * IM_PHYSLEN(im,1) * SZ_PIXEL +
+		    IM_PIXOFF(im)
+		nchars = IM_PHYSLEN(im,1) * SZ_PIXEL
+		ifnoerr (bp = (freadp (fd, offset, nchars) - 1) / SZ_PIXEL + 1)
+		    return (bp)
+	    }
+
+	    vs[1] = 1
+	    ve[1] = IM_LEN(im,1)
+	    vs[2] = linenum
+	    ve[2] = linenum
+
+	    return (imggs$t (im, vs, ve, 2))
+	}
+end
-- 
cgit