# 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 imgl1r (im)

pointer	im
int	fd, nchars
long	offset
pointer	bp, imggsr(), freadp()
errchk	imopsf

begin
	repeat {
	    if (IM_FAST(im) == YES && IM_PIXTYPE(im) == TY_REAL) {
		fd = IM_PFD(im)
		if (fd == NULL) {
		    call imopsf (im)
		    next
		}

		offset = IM_PIXOFF(im)
		nchars = IM_PHYSLEN(im,1) * SZ_REAL
		ifnoerr (bp = (freadp (fd, offset, nchars) - 1) / SZ_REAL + 1)
		    return (bp)
	    }
	    return (imggsr (im, long(1), IM_LEN(im,1), 1))
	}
end