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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
include "imfort.h"
# IMPIXF -- Called on an open image to return the BFIO file descriptor of the
# pixel file, and all important physical parameters describing where and how
# the pixels are stored. This information may be used to directly access the
# pixel file, in particularly demanding applications. Both the BFIO descriptor
# and the (host) pixel file name are returned, with the expectation that the
# caller will either use BFIO to directly access the pixel file, or call BFCLOS
# to close the file, and reopen it under some other i/o package.
#
# NOTE - Use of this interface implies explicit knowledge of the physical
# storage schema, hence programs which use this information may cease to work
# in the future if the image storage format changes, e.g., if an IMFORT
# interface is implemented for some storage format other than OIF.
procedure impixf (im, pixfd, pixfil, pixoff, szline, ier)
pointer im # image descriptor
int pixfd # receives BFIO file descriptor of pixel file
% character*(*) pixfil
int pixoff # one-indexed char offset to the pixels
int szline # nchars used to store each image line
int ier
pointer sp, osfn, ip
int stridxs()
bool strne()
begin
call smark (sp)
call salloc (osfn, SZ_PATHNAME, TY_CHAR)
if (strne (IM_MAGIC(im), "imhdr"))
ier = IE_MAGIC
else {
call imf_gpixfname (IM_PIXFILE(im), IM_HDRFILE(im), Memc[osfn],
SZ_PATHNAME)
ip = osfn + stridxs ("!", Memc[osfn])
call f77pak (Memc[ip], pixfil, len(pixfil))
pixfd = IM_PIXFP(im)
pixoff = IM_PIXOFF(im)
szline = IM_LINESIZE(im)
ier = OK
}
call sfree (sp)
end
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