--- /dev/null
+#!/bin/sh
+#
+# 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...
+#
+# The video grabbing part is SGI-specific -- if you want to use this on
+# another system, add a new clause to the grab() procedure.
+
+
+# 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=${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
+
+
+# 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: $0 [-display dpy] [-verbose] [-root | -window]" >&2
+ echo " [-stdin] [-stdout] [-delay secs]" >&2
+ exit 1
+ ;;
+ esac
+ shift
+ done
+
+ xvargs="-quick24"
+
+ if [ "$onroot" = true ]; then
+ xvargs="$xvargs -root -rmode 5 -noresetroot -rfg black -rbg black -viewonly"
+ else
+ xvargs="$xvargs -geom +0+0"
+ fi
+
+
+ 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
+}
+
+
+clean() {
+ 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. leaves it in $tmp_ppm1.
+#
+grab() {
+ 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_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
+ clean2
+ exit 1
+ fi
+}
+
+
+# Use perl to pick a random foreground/background color in pbm's syntax.
+#
+randcolor() {
+ $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() {
+
+ 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_ppm1 | pgmedge | pgmtoppm `randcolor` | ppmnorm
+
+ elif [ $N = 1 ]; then
+ ppmtopgm $tmp_ppm1 |
+ pgmenhance |
+ pgmtoppm `randcolor`
+
+ elif [ $N = 2 ]; then
+ ppmtopgm $tmp_ppm1 | pgmoil | pgmtoppm `randcolor`
+
+ elif [ $N = 3 ]; then
+ ppmrelief $tmp_ppm1 | ppmtopgm | pgmedge | ppmrelief | ppmtopgm |
+ pgmedge | pnminvert | pgmtoppm `randcolor`
+
+ elif [ $N = 4 ]; then
+ ppmspread 71 $tmp_ppm1 > $tmp_ppm2
+ pnmarith -add $tmp_ppm1 $tmp_ppm2
+
+ elif [ $N = 5 ]; then
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
+ pnmarith -multiply $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
+ pnmflip -tb $tmp_ppm3 | ppmnorm > $tmp_ppm2
+ pnmarith -multiply $tmp_ppm1 $tmp_ppm2
+
+ elif [ $N = 6 ]; then
+ N2=`rand 3`
+ if [ $N2 = 0 ]; then
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
+ elif [ $N2 = 1 ]; then
+ pnmflip -tb $tmp_ppm1 > $tmp_ppm2
+ else
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
+ pnmflip -tb $tmp_ppm2 > $tmp_ppm3
+ cp $tmp_ppm3 $tmp_ppm2
+ fi
+
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2
+
+ elif [ $N = 7 ]; then
+
+ for i in 1 2 3 ; do
+ ppmtopgm $tmp_ppm1 | pgmedge > $tmp_ppm2
+ pnmarith -difference $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
+ cp $tmp_ppm3 $tmp_ppm1
+ done
+ ppmnorm < $tmp_ppm1
+
+ elif [ $N = 8 ]; then
+ pnmflip -lr $tmp_ppm1 > $tmp_ppm2
+ pnmarith -multiply $tmp_ppm1 $tmp_ppm2 | ppmrelief | ppmnorm | pnminvert
+
+ elif [ $N = 9 ]; then
+ 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`
+
+ 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 $tmp_ppm1 ]; do
+ if [ "$use_stdin" != true ]; then
+ grab
+ else
+ cp $tmp_ppmS $tmp_ppm0
+ cp $tmp_ppm0 $tmp_ppm1
+ fi
+ done
+
+ rm -f $tmp_rgb
+
+ if [ "$screen_width" != "" ]; then
+ frob | pnmscale -width $screen_width > $tmp_ppm3
+ else
+ frob > $tmp_ppm3
+ fi
+
+ rm -f $tmp_ppm1 $tmp_ppm2
+}
+
+
+# Kill off the xv subprocess, if it's running
+#
+kill_pid() {
+ if [ "$pid" != "" ]; then
+
+ if [ "$verbose" = true ]; then
+ echo "killing pid $pid..." >&2
+ fi
+
+ # 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
+
+ # 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
+ echo "trapped signal!" >&2
+ fi
+ kill_pid
+ clean2
+ exit 1
+}
+
+main() {
+
+ getargs $@
+
+ trap my_trap 1 2 3 6 9 13 15
+
+ if [ "$use_stdin" = true ]; then
+ cat > $tmp_ppmS
+ fi
+
+ while true; do
+
+ # Loop grabbing and frobbing images.
+ #
+ # If we're running on the root, run xv in the foreground (with -exit)
+ # and then wait.
+ #
+ # If we're running in a window, spawn xv in the background; then when
+ # it's time to put up the new image, kill off the currently-running xv.
+
+ if [ "$verbose" = true ]; then
+ whack
+ else
+ 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
+
+ if [ -s $tmp_ppm2 ]; then
+ if [ "$verbose" = true ]; then
+ echo "launching xv $xvargs $tmp_ppm2" >&2
+ ls -lF $tmp_ppm2
+ fi
+
+ mv $tmp_ppm2 $tmp_ppm0
+ xv $xvargs $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 | xv $xvargs - &
+
+ pid=$!
+ fi
+ fi
+
+ clean
+ sleep $delay
+
+ done
+ exit 1
+}
+
+main $@
+
+# to find stray xv data:
+# xwininfo -root -children|grep 'xv image comments' | awk '{print "xkill -id ", $1}'
projects / xscreensaver / blobdiff