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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <config.h>
include <syserr.h>
include <fset.h>
include <fio.h>
include <gki.h>
# GKI_GETCELLARRAY -- Input a cell array (pixel array).
#
# BOI GKI_GETCELLARRAY L LL UR NC NL
#
# L(i) 9
# LL(p) coordinates of lower left corner of input area
# UR(p) coordinates of upper right corner of input area
# NC(i) number of columns in array
# NL(i) number of lines in array
procedure gki_getcellarray (fd, m, nx, ny, x1,y1, x2,y2)
int fd # output file
int nx, ny # number of columns and lines in M
short m[nx,ny] # output array
int x1, y1 # lower left corner of window to be read
int x2, y2 # upper right corner of window to be read
int epa, nchars, npts
short ca[GKI_CELLARRAY_LEN]
short gki[GKI_GETCELLARRAY_LEN]
int read()
data gki[1] /BOI/, gki[2] /GKI_GETCELLARRAY/, gki[3] /GKI_GETCELLARRAY_LEN/
errchk write, seek, flush, read
include "gki.com"
begin
# If the kernel is inline it will return the cell array value in the
# graphics stream FIO buffer just as if the kernel were resident
# in another process. We rewind the buffer after the kernel writes
# into it in preparation for the read below.
if (IS_INLINE(fd)) {
call fseti (fd, F_CANCEL, OK)
epa = gk_dd[GKI_GETCELLARRAY]
if (epa != 0)
call zcall6 (epa, nx,ny, x1,y1, x2,y2)
call seek (fd, BOFL)
} else {
# Write get cell array instruction to the kernel.
gki[GKI_GETCELLARRAY_LL] = x1
gki[GKI_GETCELLARRAY_LL+1] = y1
gki[GKI_GETCELLARRAY_UR] = x2
gki[GKI_GETCELLARRAY_UR+1] = y2
gki[GKI_GETCELLARRAY_NC] = nx
gki[GKI_GETCELLARRAY_NL] = ny
call write (gk_fd[fd], gki, GKI_GETCELLARRAY_LEN)
# If the kernel is a subprocess we must call PR_PSIO to allow the
# kernel to read the instruction and return the cell array value.
if (IS_SUBKERNEL(fd)) {
call seek (fd, BOFL)
call zcall3 (gk_prpsio, KERNEL_PID(fd), fd, FF_READ)
call seek (fd, BOFL)
} else
call flush (gk_fd[fd])
}
# Read and decode the cell array value.
nchars = GKI_CELLARRAY_LEN * SZ_SHORT
if (read (fd, ca, nchars) < nchars) {
call syserr (SYS_GGCELL)
} else if (ca[1] != BOI || ca[2] != GKI_CELLARRAY ||
ca[GKI_CELLARRAY_NP] <= 0) {
call syserr (SYS_GGCELL)
} else {
npts = ca[GKI_CELLARRAY_NP]
nchars = min (nx * ny, npts) * SZ_SHORT
if (read (fd, m, nchars) < nchars)
call syserr (SYS_GGCELL)
}
call fseti (fd, F_CANCEL, OK)
end
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