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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
include "imexam.h"
# IE_GETNFRAMES -- Determine the number of image display frames. If the
# display can be accessed at all we assume there is always at least one
# frame; beyond that presence of a valid WCS is used to test whether we
# are interested in looking at a frame.
int procedure ie_getnframes (ie)
pointer ie #I imexamine descriptor
pointer sp, imname, ds, iw
int server, nframes, status, i
int clgeti(), strncmp(), imd_wcsver()
pointer imd_mapframe(), iw_open()
errchk imd_mapframe, clgeti
begin
call smark (sp)
call salloc (imname, SZ_FNAME, TY_CHAR)
nframes = clgeti ("nframes")
if (nframes == 0) {
# Try to automatically determine the number of frames.
ds = IE_DS(ie)
if (ds == NULL)
ds = imd_mapframe (1, READ_WRITE, NO)
# If we are talking to a simple image display we assume the device
# has 4 frames (until more general display interfaces come along).
# Servers are more complicated because the number of frames is
# dynamically configurable, even while imexamine is running.
# We use the WCS query to try to count the current number of
# allocated frames in the case of a server device.
server = IM_LEN(ds,4)
if (server == YES && imd_wcsver() != 0) {
nframes = 1
do i = 1, MAX_FRAMES {
iferr (iw = iw_open (ds, i, Memc[imname], SZ_FNAME, status))
next
call iw_close (iw)
if (strncmp (Memc[imname], "[NOSUCHFRAME]", 3) != 0)
nframes = max (nframes, i)
}
} else
nframes = 4
if (IE_DS(ie) == NULL)
call imunmap (ds)
}
IE_NFRAMES(ie) = max (nframes, IE_DFRAME(ie)/100)
call sfree (sp)
return (nframes)
end
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