#!/bin/sh
#
-# vidwhacker, for xscreensaver. Copyright (c) 1998 Jamie Zawinski.
+# vidwhacker, for xscreensaver. Copyright (c) 1998, 1999 Jamie Zawinski.
+#
+# Permission to use, copy, modify, distribute, and sell this software and its
+# documentation for any purpose is hereby granted without fee, provided that
+# the above copyright notice appear in all copies and that both that
+# copyright notice and this permission notice appear in supporting
+# documentation. No representations are made about the suitability of this
+# software for any purpose. It is provided "as is" without express or
+# implied warranty.
+#
#
# This script grabs a frame of video, then uses various pbm filters to
-# munge the image in random nefarious ways, then uses xv to put it on
-# the root window. This works out really nicely if you just feed some
-# random TV station into it...
+# munge the image in random nefarious ways, then uses xloadimage, xli, or xv
+# to put it on the root window. This works out really nicely if you just
+# feed some random TV station into it...
#
# The video grabbing part is SGI-specific -- if you want to use this on
# another system, add a new clause to the grab() procedure.
-# Process command-line args...
+# need perl to generate random numbers -- I don't know another way to do
+# that from a shell script.
+perl=perl
+
onroot=false
verbose=false
delay=3
use_stdin=false
+use_stdout=false
pid=""
-tmp=/tmp/vd$$
+tmp=${TMPDIR:-/tmp}/vidwhacker.$$
tmp_rgb=$tmp-00000.rgb
tmp_ppm0=$tmp-0.ppm
tmp_ppm1=$tmp-1.ppm
tmp_ppm2=$tmp-2.ppm
tmp_ppm3=$tmp-3.ppm
tmp_ppm4=$tmp-4.ppm
+tmp_ppmS=$tmp-S.ppm
+
+
+# Figure out whether to use xloadimage, xli, or xv.
+pick_displayer() {
+ displayer=
+ for prog in xloadimage xli xv ; do
+ IFS=:
+ for p in $PATH; do
+ IFS=
+ if [ "$p" = "" ]; then p=. ; fi
+ if [ -x $p/$prog ]; then
+ displayer=$prog
+ break 2
+ fi
+ done
+ done
+ if [ "$displayer" = "xloadimage" ]; then
+ displayer_args="-quiet"
+ displayer_win_args=""
+ displayer_root_args="-onroot"
+ elif [ "$displayer" = "xli" ]; then
+ displayer_args="-quiet"
+ displayer_win_args=""
+ displayer_root_args="-onroot -center -border black"
+ elif [ "$displayer" = "xv" ]; then
+ displayer_args="-quick24"
+ displayer_win_args="-geom +0+0"
+ displayer_root_args="-root -rmode 5 -noresetroot -rfg black -rbg black -viewonly"
+ else
+ echo "$0: neither xli nor xv found on \$PATH"
+ exit -1
+ fi
+}
+# Process command-line args
getargs() {
while [ $# != 0 ]; do
case "$1" in
+ -display | -disp | -dis | -dpy | -d )
+ shift
+ DISPLAY="$1"
+ export DISPLAY
+ ;;
-root )
onroot=true
;;
+ -window )
+ onroot=false
+ ;;
-verbose )
verbose=true
;;
-stdin )
use_stdin=true
;;
+ -stdout )
+ use_stdout=true
+ ;;
+ -delay)
+ shift
+ delay="$1"
+ ;;
* )
- echo "usage: $0 [ -root | -verbose | -stdin ]" >&2
+ echo "VidWhacker, Copyright (c) 1999 Jamie Zawinski <jwz@jwz.org>" >&2
+ echo " http://www.jwz.org/xscreensaver/" >&2
+ echo "" >&2
+ echo "usage: $0 [-display dpy] [-verbose] [-root | -window]" >&2
+ echo " [-stdin] [-stdout] [-delay secs]" >&2
exit 1
;;
esac
shift
done
- xvargs="-quick24"
+ pick_displayer
if [ "$onroot" = true ]; then
- xvargs="$xvargs -root -rmode 5 -noresetroot -rfg black -rbg black -viewonly"
+ displayer_args="$displayer_args $displayer_root_args"
else
- xvargs="$xvargs -geom +0+0"
+ displayer_args="$displayer_args $displayer_win_args"
fi
- screen_width=`xdpyinfo | sed -n 's/.* dimensions: *\([0-9]*\).*/\1/p'`
+
+ screen_width=''
+ if [ "$use_stdout" = false ]; then
+ screen_width=`xdpyinfo 2>/dev/null |
+ sed -n 's/.* dimensions: *\([0-9]*\).*/\1/p'`
+ if [ "$screen_width" = "" ]; then
+ screen_width=800
+ fi
+ fi
}
clean2() {
clean
- rm -f $tmp_ppm0
+ rm -f $tmp_ppm0 $tmp_ppmS
}
-# Grab a frame of video.
+# Grab a frame of video. leaves it in $tmp_ppm1.
#
grab() {
uname=`uname`
qcam > $tmp_ppm1
+ # Friedrich Delgado Friedrichs says the following works if you have
+ # XawTV installed:
+ #
+ # streamer -o $tmp_ppm1
+ #
+
else
echo "$0: don't know how to grab video on this OS." >&2
clean2
# Use perl to pick a random foreground/background color in pbm's syntax.
#
randcolor() {
- perl -e 'srand;
- printf("#%02x%02x%02x-#%02x%02x%02x",
- int(rand()*60),
- int(rand()*60),
- int(rand()*60),
- 120+int(rand()*135),
- 120+int(rand()*135),
- 120+int(rand()*135))'
+ $perl -e 'srand(time ^ $$);
+ printf("#%02x%02x%02x-#%02x%02x%02x",
+ int(rand()*60),
+ int(rand()*60),
+ int(rand()*60),
+ 120+int(rand()*135),
+ 120+int(rand()*135),
+ 120+int(rand()*135))'
+}
+
+rand() {
+ $perl -e "srand(time ^ $$); print int(rand() * $1)"
}
+
+
# Frobnicate the image in some random way.
#
frob() {
width=`echo $w_h | awk '{print $1}'`
height=`echo $w_h | awk '{print $2}'`
- N=`perl -e 'srand; print int(rand() * 17)'`
+ N=`rand 17`
if [ "$verbose" = true ]; then
echo "mode $N..." >&2
pnmarith -multiply $tmp_ppm1 $tmp_ppm2
elif [ $N = 6 ]; then
- N2=`perl -e 'srand; print int(rand() * 3)'`
+ N2=`rand 3`
if [ $N2 = 0 ]; then
pnmflip -lr $tmp_ppm1 > $tmp_ppm2
elif [ $N2 = 1 ]; then
if [ "$use_stdin" != true ]; then
grab
else
+ cp $tmp_ppmS $tmp_ppm0
cp $tmp_ppm0 $tmp_ppm1
fi
done
rm -f $tmp_rgb
- frob | pnmscale -width $screen_width > $tmp_ppm3
+
+ if [ "$screen_width" != "" ]; then
+ frob | pnmscale -width $screen_width > $tmp_ppm3
+ else
+ frob > $tmp_ppm3
+ fi
+
rm -f $tmp_ppm1 $tmp_ppm2
}
-# Kill off the xv subprocess, if it's running
+# Kill off the xli or xv subprocess, if it's running
#
kill_pid() {
if [ "$pid" != "" ]; then
# ( sh -c "kill $pid" ) >/dev/null 2>/dev/null </dev/null
# wtf? that doesn't work either. Is it writing to /dev/tty??
- kill $pid >&- >&-
+ kill $pid >/dev/null 2>&1
pid=""
fi
getargs $@
- trap my_trap 0 1 2 3 6 9 13
+ trap my_trap 1 2 3 6 9 13 15
if [ "$use_stdin" = true ]; then
- cat > $tmp_ppm0
+ cat > $tmp_ppmS
fi
while true; do
# Loop grabbing and frobbing images.
#
- # If we're running on the root, run xv in the foreground (with -exit)
- # and then wait.
+ # If we're running on the root, run xv or xli in the foreground
+ # (with -exit, if xv) and then wait.
#
- # If we're running in a window, spawn xv in the background; then when
- # it's time to put up the new image, kill off the currently-running xv.
+ # If we're running in a window, spawn xv or xli in the background; then
+ # when it's time to put up the new image, kill off the currently-running
+ # xv or xli.
if [ "$verbose" = true ]; then
whack
else
- whack >&- 2>&-
+ whack >/dev/null 2>&1
fi
kill_pid
if [ ! -s $tmp_ppm3 ]; then
echo "$0: no image grabbed" >&2
+
+ elif [ "$use_stdout" = true ]; then
+
+ cat $tmp_ppm3
+ clean2
+ exit 0
+
else
- pnmtosgi < $tmp_ppm3 > $tmp_ppm2
- rm -f $tmp_ppm3
+# pnmtosgi < $tmp_ppm3 > $tmp_ppm2
+# rm -f $tmp_ppm3
+ mv $tmp_ppm3 $tmp_ppm2
if [ -s $tmp_ppm2 ]; then
if [ "$verbose" = true ]; then
- echo "launching xv $xvargs $tmp_ppm2" >&2
+ echo "launching $displayer $displayer_args $tmp_ppm2" >&2
ls -lF $tmp_ppm2
fi
- # cat the file so that we can nuke it without racing against xv.
- cat $tmp_ppm2 | xv $xvargs - &
+ mv $tmp_ppm2 $tmp_ppm0
+ eval "$displayer $displayer_args $tmp_ppm0 &"
+
+# this doesn't work -- leaves xv processes around, instead of stray xset
+# data. Sigh.
+#
+# # cat the file so that we can nuke it without racing against xv.
+# cat $tmp_ppm2 | $displayer $displayer_args - &
+
pid=$!
fi
fi
projects / xscreensaver / blobdiff