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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 imgl1d (im)
pointer im
int fd, nchars
long offset
pointer bp, imggsd(), freadp()
errchk imopsf
begin
repeat {
if (IM_FAST(im) == YES && IM_PIXTYPE(im) == TY_DOUBLE) {
fd = IM_PFD(im)
if (fd == NULL) {
call imopsf (im)
next
}
offset = IM_PIXOFF(im)
nchars = IM_PHYSLEN(im,1) * SZ_DOUBLE
ifnoerr (bp = (freadp (fd, offset, nchars) - 1) / SZ_DOUBLE + 1)
return (bp)
}
return (imggsd (im, long(1), IM_LEN(im,1), 1))
}
end
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