+++ /dev/null
-#!/bin/sh
-#
-# vidwhacker, for xscreensaver. Copyright (c) 1998 Jamie Zawinski.
-#
-# 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.
-
-
-# Process command-line args...
-
-onroot=false
-verbose=false
-delay=3
-use_stdin=false
-
-pid=""
-tmp=/tmp/vd$$
-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
-
-
-getargs() {
-
- while [ $# != 0 ]; do
- case "$1" in
- -root )
- onroot=true
- ;;
- -verbose )
- verbose=true
- ;;
- -stdin )
- use_stdin=true
- ;;
- * )
- echo "usage: $0 [ -root | -verbose | -stdin ]" >&2
- exit 1
- ;;
- esac
- shift
- done
-
- xvargs="-quick24"
-
- if [ "$onroot" = true ]; then
- xvargs="$xvargs -root -rmode 5 -noresetroot -rfg black -rbg black -viewonly"
- else
- xvargs="$xvargs -geom +0+0"
- fi
-
- screen_width=`xdpyinfo | sed -n 's/.* dimensions: *\([0-9]*\).*/\1/p'`
-}
-
-
-clean() {
- rm -f $tmp_rgb $tmp_ppm1 $tmp_ppm2 $tmp_ppm3 $tmp_ppm4
-}
-
-clean2() {
- clean
- rm -f $tmp_ppm0
-}
-
-
-# Grab a frame of video.
-#
-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 with a
- # Brooktree 848 or 878 tuner card:
- #
- # bttvgrab -Q -d q -l 1 -F /dev/null -o gif -f ${tmp}.gif -N PAL
- # giftopnm ${tmp}.gif > $tmp_ppm1
- # rm ${tmp}.gif
- #
- # He notes that you might need to run a TV application (e.g., xawtv)
- # before the first time you run vidwhacker in order to initialize the
- # tuner card and kernel modules.
-
-
- 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;
- 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))'
-}
-
-# 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 $2}'`
-
- N=`perl -e 'srand; print int(rand() * 17)'`
-
- if [ "$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=`perl -e 'srand; print int(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_ppm0 $tmp_ppm1
- fi
- done
-
- rm -f $tmp_rgb
- frob | pnmscale -width $screen_width > $tmp_ppm3
- 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 $pid >&- >&-
-
- pid=""
- fi
-}
-
-# called when this process is signalled (for cleanup)
-#
-my_trap() {
- if [ "$verbose" = true ]; then
- echo "trapped signal!" >&2
- fi
- kill_pid
- clean2
- exit 1
-}
-
-main() {
-
- getargs $@
-
- trap my_trap 0 1 2 3 6 9 13 15
-
- if [ "$use_stdin" = true ]; then
- cat > $tmp_ppm0
- fi
-
- while true; do
-
- # Loop grabbing and frobbing images.
- #
- # If we're running on the root, run xv in the foreground (with -exit)
- # and then wait.
- #
- # If we're running in a window, spawn xv in the background; then when
- # it's time to put up the new image, kill off the currently-running xv.
-
- if [ "$verbose" = true ]; then
- whack
- else
- whack >&- 2>&-
- fi
-
- kill_pid
-
- if [ ! -s $tmp_ppm3 ]; then
- echo "$0: no image grabbed" >&2
- 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