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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_GETCURSOR -- Read the cursor position in device coordinates.
#
# BOI GKI_GETCURSOR L CN
#
# L(i) 4
# CN(i) cursor number
#
# The kernel reads graphics cursor number CN and returns the
# keystroke value (if any) and the cursor position in NDC
# coordinates. The cursor attributes are returned in the
# following format:
#
# BOI GKI_CURSORVALUE L CN KEY SX SY RN RX RY
#
# where
#
# L(i) 10
# CN(i) cursor number
# KEY(i) keystroke value (>= 0 or EOF)
# SX(i) NDC X screen coordinate of cursor
# SY(i) NDC Y screen coordinate of cursor
# RN(i) raster number or zero
# RX(i) NDC X raster coordinate of cursor
# RY(i) NDC Y raster coordinate of cursor
#
# The screen or display window coordinates SX and SY of the cursor are
# returned for all devices. Only some devices support multiple rasters.
# If the device supports rasters and the cursor is in a rasters when read, the
# rasters number and rasters coordinates are returned in RN,RX,RY. This is in
# addition to the screen coordinates SX,SY. If rasters coordinates are not
# returned, the rasters number will be set to zero and RX,RY will be the same
# as SX,SY.
procedure gki_getcursor (fd, cursor, cn, key, sx, sy, raster, rx, ry)
int fd #I output file
int cursor #I cursor to be read
int cn #O cursor number actually read
int key #O keystroke value or EOF
int sx, sy #O screen coordinates of cursor
int raster #O raster number
int rx, ry #O raster coordinates of cursor
int epa
int nchars, read()
short gki[GKI_GETCURSOR_LEN]
short cur[GKI_CURSORVALUE_LEN]
data gki[1] /BOI/, gki[2] /GKI_GETCURSOR/, gki[3] /GKI_GETCURSOR_LEN/
include "gki.com"
errchk write, flush, read
begin
# If the kernel is inline it will return the cursor 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_GETCURSOR]
if (epa != 0)
call zcall1 (epa, cursor)
call seek (fd, BOFL)
} else {
# Write cursor read instruction to the kernel.
gki[GKI_GETCURSOR_CN] = cursor
call write (gk_fd[fd], gki, GKI_GETCURSOR_LEN * SZ_SHORT)
# If the kernel is a subprocess we must call PR_PSIO to allow the
# kernel to read the instruction and return the cursor 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 cursor value instruction.
nchars = GKI_CURSORVALUE_LEN * SZ_SHORT
if (read (fd, cur, nchars) < nchars)
key = EOF
else if (cur[1] != BOI || cur[2] != GKI_CURSORVALUE)
call syserr (SYS_GGCUR)
else {
cn = cur[GKI_CURSORVALUE_CN]
key = cur[GKI_CURSORVALUE_KEY]
sx = cur[GKI_CURSORVALUE_SX]
sy = cur[GKI_CURSORVALUE_SY]
raster = cur[GKI_CURSORVALUE_RN]
rx = cur[GKI_CURSORVALUE_RX]
ry = cur[GKI_CURSORVALUE_RY]
}
call fseti (fd, F_CANCEL, OK)
end
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