#!/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
-if [ "$1" = "-root" ]; then
- onroot=true
- shift
-fi
-
-if [ "$1" = "-verbose" ]; then
- verbose=true
- shift
-fi
+pid=""
+tmp=${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 [ "$1" != "" ]; then
- echo "usage: $0 [-root] [-verbose]" >&2
- exit 1
-fi
+ if [ "$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 "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="$xvargs -root -rmode 5 -quit"
-else
- xvargs="$xvargs -geom +0+0"
-fi
+ if [ "$onroot" = true ]; then
+ displayer_args="$displayer_args $displayer_root_args"
+ else
+ displayer_args="$displayer_args $displayer_win_args"
+ fi
-screen_width=`xdpyinfo | sed -n 's/.* dimensions: *\([0-9]*\).*/\1/p'`
-# global vars...
+ 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
+}
-tmp=/tmp/vd$$
-tmp_rgb=$tmp-00000.rgb
-tmp_ppm=$tmp.ppm
-tmp_ppm2=$tmp-2.ppm
-tmp_ppm3=$tmp-3.ppm
clean() {
- rm -f $tmp_rgb $tmp_ppm $tmp_ppm2 $tmp_ppm3
+ rm -f $tmp_rgb $tmp_ppm1 $tmp_ppm2 $tmp_ppm3 $tmp_ppm4
+}
+
+clean2() {
+ clean
+ rm -f $tmp_ppm0 $tmp_ppmS
}
-# Grab a frame of video.
+# Grab a frame of video. leaves it in $tmp_ppm1.
#
grab() {
- if [ `uname` = IRIX ]; then
+ uname=`uname`
+ if [ $uname = IRIX ]; then
#
# SGI's "vidtomem" returns an SGI RGB image of the default video input,
# and has stupid non-overridable ouput-file-naming conventions. So, let
# it write its file; and then convert it to a pgm.
#
+
vidtomem -f $tmp
- sgitopnm $tmp_rgb > $tmp_ppm
+ sgitopnm $tmp_rgb > $tmp_ppm1
+
# Cut off the close-captioning blips in the NTSC overscan region. YMMV.
# | pnmcut 12 7 695 477
+ elif [ $uname = Linux ]; then
+
+ # Marcus Herbert says the following works with his Connectix Qcam.
+ # Don't have qcam? Well, do something else then... and send me a patch.
+
+ 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
- clean
+ clean2
exit 1
fi
-
-
- # I got this message from Marcus Herbert <rhoenie@chillout.org>.
- # I'm not sure of the best way to make the presence of qcam be
- # auto-detected, but here's what he said, FYI...
- #
- # i am using a black/white Connectix Qcam on linux and its very simple
- # to adept the script:
- #
- # # qcam: Version 0.91
- # # Options:
- # # O -x width Set width
- # # O y height Setheight
- # # O B bpp Setbits per pixel
- # # O W Auto-set white balance
- # # O E "vals" Autoexposure mode, parameters required
- # # O D Remove dark speckling
- # # O s val Set scaling factor (1, 2, or 4)
- # #
- # qcam -x 320 -y 240 -B 6 -W -E 1 -D -s 1 > $tmp_ppm
- #
- # You dont really need the parameters for qcam as it reads out a system
- # config file where you store the values for brightnes, contrast and
- # white balance. But with this parameters you are independant of the
- # light ratios at the place the cam is set up.
- #
- # Other versions of qcam (0.7, 0.96..) don't support the autoexposure and
- # auto- whitebalance commandline parameters. On such systems (and on
- # color-qcam systems) a simple qcam > $tmp_ppm (or cqcam > $tmp_ppm) is
- # enough.
- #
- # I dont know about other systems but afaik fBSD uses the Qcam in this way:
- #
- # qcamcontrol -bla -foo -bar > picture.pgm
- #
}
# 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() {
- N=`perl -e 'srand; print int(rand() * 10)'`
+ w_h=`head -2 $tmp_ppm1 | tail -1`
+ width=`echo $w_h | awk '{print $1}'`
+ height=`echo $w_h | awk '{print $2}'`
+
+ N=`rand 17`
if [ "$verbose" = true ]; then
echo "mode $N..." >&2
fi
if [ $N = 0 ]; then
- ppmtopgm $tmp_ppm | pgmedge | pgmtoppm `randcolor` | ppmnorm
+ ppmtopgm $tmp_ppm1 | pgmedge | pgmtoppm `randcolor` | ppmnorm
elif [ $N = 1 ]; then
- ppmtopgm $tmp_ppm |
+ ppmtopgm $tmp_ppm1 |
pgmenhance |
pgmtoppm `randcolor`
elif [ $N = 2 ]; then
- ppmtopgm $tmp_ppm | pgmoil | pgmtoppm `randcolor`
+ ppmtopgm $tmp_ppm1 | pgmoil | pgmtoppm `randcolor`
elif [ $N = 3 ]; then
- ppmrelief $tmp_ppm | ppmtopgm | pgmedge | ppmrelief | ppmtopgm |
+ ppmrelief $tmp_ppm1 | ppmtopgm | pgmedge | ppmrelief | ppmtopgm |
pgmedge | pnminvert | pgmtoppm `randcolor`
elif [ $N = 4 ]; then
- ppmspread 71 $tmp_ppm > $tmp_ppm2
- pnmarith -add $tmp_ppm $tmp_ppm2
+ ppmspread 71 $tmp_ppm1 > $tmp_ppm2
+ pnmarith -add $tmp_ppm1 $tmp_ppm2
elif [ $N = 5 ]; then
- pnmflip -lr $tmp_ppm > $tmp_ppm2
- pnmarith -multiply $tmp_ppm $tmp_ppm2 > $tmp_ppm3
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
+ pnmarith -multiply $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
pnmflip -tb $tmp_ppm3 | ppmnorm > $tmp_ppm2
- pnmarith -multiply $tmp_ppm $tmp_ppm2
+ 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_ppm > $tmp_ppm2
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
elif [ $N2 = 1 ]; then
- pnmflip -tb $tmp_ppm > $tmp_ppm2
+ pnmflip -tb $tmp_ppm1 > $tmp_ppm2
else
- pnmflip -lr $tmp_ppm > $tmp_ppm2
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
pnmflip -tb $tmp_ppm2 > $tmp_ppm3
cp $tmp_ppm3 $tmp_ppm2
fi
- pnmarith -difference $tmp_ppm $tmp_ppm2
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2
elif [ $N = 7 ]; then
for i in 1 2 3 ; do
- ppmtopgm $tmp_ppm | pgmedge > $tmp_ppm2
- pnmarith -difference $tmp_ppm $tmp_ppm2 > $tmp_ppm3
- cp $tmp_ppm3 $tmp_ppm
+ ppmtopgm $tmp_ppm1 | pgmedge > $tmp_ppm2
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
+ cp $tmp_ppm3 $tmp_ppm1
done
- ppmnorm < $tmp_ppm
+ ppmnorm < $tmp_ppm1
elif [ $N = 8 ]; then
- pnmflip -lr $tmp_ppm > $tmp_ppm2
- pnmarith -multiply $tmp_ppm $tmp_ppm2 | ppmrelief | ppmnorm | pnminvert
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
+ pnmarith -multiply $tmp_ppm1 $tmp_ppm2 | ppmrelief | ppmnorm | pnminvert
elif [ $N = 9 ]; then
- pnmflip -lr $tmp_ppm > $tmp_ppm2
- pnmarith -subtract $tmp_ppm $tmp_ppm2 | ppmrelief | ppmtopgm | pgmedge
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
+ pnmarith -subtract $tmp_ppm1 $tmp_ppm2 | ppmrelief | ppmtopgm | pgmedge
+
+ elif [ $N = 10 ]; then
+ ppmtopgm $tmp_ppm1 | pgmbentley | pgmtoppm `randcolor`
- else cat $tmp_ppm
+ elif [ $N = 11 ]; then
+ pgmcrater -number 20000 -height $height -width $width | pgmtoppm `randcolor` > $tmp_ppm2
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
+ pnmflip -tb $tmp_ppm3 | ppmnorm > $tmp_ppm2
+ pnmarith -multiply $tmp_ppm1 $tmp_ppm2
+
+ elif [ $N = 12 ]; then
+ ppmshift 30 $tmp_ppm1 | ppmtopgm | pgmoil | pgmedge | pgmtoppm `randcolor` > $tmp_ppm2
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2
+
+ elif [ $N = 13 ]; then
+ ppmpat -madras $width $height | pnmdepth 255 > $tmp_ppm2
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2
+
+ elif [ $N = 14 ]; then
+ ppmpat -tartan $width $height | pnmdepth 255 > $tmp_ppm2
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2
+
+ elif [ $N = 15 ]; then
+ ppmpat -camo $width $height | pnmdepth 255 | ppmshift 50 > $tmp_ppm2
+ pnmarith -multiply $tmp_ppm1 $tmp_ppm2
+
+ elif [ $N = 16 ]; then
+ pgmnoise $width $height | pgmedge | pgmtoppm `randcolor` > $tmp_ppm2
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2 | pnmdepth 255 | pnmsmooth
+
+ else cat $tmp_ppm1
fi
}
-
# Grab a frame and frob it. leave it in $tmp_ppm3.
#
whack() {
clean
- while [ ! -f $tmp_ppm ]; do
- grab
+ while [ ! -f $tmp_ppm1 ]; do
+ if [ "$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
- rm -f $tmp_ppm $tmp_ppm2
+
+ if [ "$screen_width" != "" ]; then
+ frob | pnmscale -width $screen_width > $tmp_ppm3
+ else
+ frob > $tmp_ppm3
+ fi
+
+ rm -f $tmp_ppm1 $tmp_ppm2
}
-pid=""
+# Kill off the xli or xv subprocess, if it's running
+#
+kill_pid() {
+ if [ "$pid" != "" ]; then
-if [ "$onroot" != true ]; then
- trap "kill \$pid; clean; exit 1" 2 15
-fi
+ if [ "$verbose" = true ]; then
+ echo "killing pid $pid..." >&2
+ fi
-while true; do
+ # need to do this to avoid "6898 Terminated" messages!
+ # apparently one can't redirect the output of the builtin `kill' command.
+# ( sh -c "kill $pid" ) >/dev/null 2>/dev/null </dev/null
- # 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 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.
+ # wtf? that doesn't work either. Is it writing to /dev/tty??
+ kill $pid >/dev/null 2>&1
+ pid=""
+ fi
+}
+
+# called when this process is signalled (for cleanup)
+#
+my_trap() {
if [ "$verbose" = true ]; then
- whack
- else
- whack >&- 2>&-
+ echo "trapped signal!" >&2
fi
+ kill_pid
+ clean2
+ exit 1
+}
- if [ "$pid" != "" ]; then
- kill $pid
- pid=""
+main() {
+
+ getargs $@
+
+ trap my_trap 1 2 3 6 9 13 15
+
+ if [ "$use_stdin" = true ]; then
+ cat > $tmp_ppmS
fi
- if [ ! -s $tmp_ppm3 ]; then
- echo "$0: no image grabbed" >&2
- else
+ while true; do
- pnmtosgi < $tmp_ppm3 > $tmp_ppm2
- rm -f $tmp_ppm3
+ # Loop grabbing and frobbing images.
+ #
+ # If we're running on the root, run xv or xli in the foreground
+ # (with -exit, if xv) and then wait.
+ #
+ # If we're running in a window, spawn xv or xli in the background; then
+ # when it's time to put up the new image, kill off the currently-running
+ # xv or xli.
- if [ "$onroot" = true ]; then
- xv $xvargs $tmp_ppm2
+ if [ "$verbose" = true ]; then
+ whack
else
- xv $xvargs $tmp_ppm2 &
- pid=$!
+ whack >/dev/null 2>&1
fi
- #xv -geom =320x220 $tmp_ppm3 &
- #pid=
- fi
+ kill_pid
- clean
- sleep $delay
+ 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
+ mv $tmp_ppm3 $tmp_ppm2
+
+ if [ -s $tmp_ppm2 ]; then
+ if [ "$verbose" = true ]; then
+ echo "launching $displayer $displayer_args $tmp_ppm2" >&2
+ ls -lF $tmp_ppm2
+ fi
+
+ 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
+
+ clean
+ sleep $delay
+
+ done
+ exit 1
+}
+
+main $@
-done
+# to find stray xv data:
+# xwininfo -root -children|grep 'xv image comments' | awk '{print "xkill -id ", $1}'
projects / xscreensaver / blobdiff