1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
include <imio.h>
include "qpf.h"
# QPF_OPIX -- Open the "pixel storage file", i.e., open the special QPF/QPOE
# virtual file driver, which samples the QPOE event list in real time to
# produce image "pixels", where each pixel contains a count of the number of
# photons mapping to that point in the output image matrix.
procedure qpf_opix (im, status)
pointer im #I image descriptor
int status #O return status
pointer sp, fname, qpf
extern qpfzop(), qpfzrd(), qpfzwr(), qpfzwt(), qpfzst(), qpfzcl()
int fopnbf()
begin
status = OK
if (IM_PFD(im) != NULL)
return
# Verify that the QPIO open succeeded at open time; if not, the file
# may not have an event list (which is legal, but not for pixel i/o).
qpf = IM_KDES(im)
if (QPF_IO(qpf) == NULL) {
status = ERR
return
}
call smark (sp)
call salloc (fname, SZ_FNAME, TY_CHAR)
# Encode the QPF descriptor as a pseudo-filename to pass the descriptor
# through fopnbf to the QPF virtual binary file driver.
call sprintf (Memc[fname], SZ_FNAME, "QPF%d")
call pargi (IM_KDES(im))
# Open a file descriptor for the dummy QPOE file driver, used to access
# the event list as a virtual pixel array (sampled at runtime).
iferr (IM_PFD(im) = fopnbf (Memc[fname], READ_ONLY,
qpfzop, qpfzrd, qpfzwr, qpfzwt, qpfzst, qpfzcl)) {
IM_PFD(im) = NULL
status = ERR
}
call sfree (sp)
end
|
