3 # vidwhacker, for xscreensaver. Copyright (c) 1998, 1999 Jamie Zawinski.
5 # Permission to use, copy, modify, distribute, and sell this software and its
6 # documentation for any purpose is hereby granted without fee, provided that
7 # the above copyright notice appear in all copies and that both that
8 # copyright notice and this permission notice appear in supporting
9 # documentation. No representations are made about the suitability of this
10 # software for any purpose. It is provided "as is" without express or
14 # This script grabs a frame of video, then uses various pbm filters to
15 # munge the image in random nefarious ways, then uses xv to put it on
16 # the root window. This works out really nicely if you just feed some
17 # random TV station into it...
19 # The video grabbing part is SGI-specific -- if you want to use this on
20 # another system, add a new clause to the grab() procedure.
23 # need perl to generate random numbers -- I don't know another way to do
24 # that from a shell script.
35 tmp=${TMPDIR:-/tmp}/vidwhacker.$$
36 tmp_rgb=$tmp-00000.rgb
45 # Process command-line args
50 -display | -disp | -dis | -dpy | -d )
75 echo "VidWhacker, Copyright (c) 1999 Jamie Zawinski <jwz@jwz.org>" >&2
76 echo " http://www.jwz.org/xscreensaver/" >&2
78 echo "usage: $0 [-display dpy] [-verbose] [-root | -window]" >&2
79 echo " [-stdin] [-stdout] [-delay secs]" >&2
88 if [ "$onroot" = true ]; then
89 xvargs="$xvargs -root -rmode 5 -noresetroot -rfg black -rbg black -viewonly"
91 xvargs="$xvargs -geom +0+0"
96 if [ "$use_stdout" = false ]; then
97 screen_width=`xdpyinfo 2>/dev/null |
98 sed -n 's/.* dimensions: *\([0-9]*\).*/\1/p'`
99 if [ "$screen_width" = "" ]; then
107 rm -f $tmp_rgb $tmp_ppm1 $tmp_ppm2 $tmp_ppm3 $tmp_ppm4
112 rm -f $tmp_ppm0 $tmp_ppmS
116 # Grab a frame of video. leaves it in $tmp_ppm1.
120 if [ $uname = IRIX ]; then
122 # SGI's "vidtomem" returns an SGI RGB image of the default video input,
123 # and has stupid non-overridable ouput-file-naming conventions. So, let
124 # it write its file; and then convert it to a pgm.
128 sgitopnm $tmp_rgb > $tmp_ppm1
130 # Cut off the close-captioning blips in the NTSC overscan region. YMMV.
131 # | pnmcut 12 7 695 477
133 elif [ $uname = Linux ]; then
135 # Marcus Herbert says the following works with his Connectix Qcam.
136 # Don't have qcam? Well, do something else then... and send me a patch.
140 # Friedrich Delgado Friedrichs says the following works if you have
143 # streamer -o $tmp_ppm1
147 echo "$0: don't know how to grab video on this OS." >&2
154 # Use perl to pick a random foreground/background color in pbm's syntax.
157 $perl -e 'srand(time ^ $$);
158 printf("#%02x%02x%02x-#%02x%02x%02x",
164 120+int(rand()*135))'
168 $perl -e "srand(time ^ $$); print int(rand() * $1)"
173 # Frobnicate the image in some random way.
177 w_h=`head -2 $tmp_ppm1 | tail -1`
178 width=`echo $w_h | awk '{print $1}'`
179 height=`echo $w_h | awk '{print $2}'`
183 if [ "$verbose" = true ]; then
184 echo "mode $N..." >&2
188 ppmtopgm $tmp_ppm1 | pgmedge | pgmtoppm `randcolor` | ppmnorm
190 elif [ $N = 1 ]; then
195 elif [ $N = 2 ]; then
196 ppmtopgm $tmp_ppm1 | pgmoil | pgmtoppm `randcolor`
198 elif [ $N = 3 ]; then
199 ppmrelief $tmp_ppm1 | ppmtopgm | pgmedge | ppmrelief | ppmtopgm |
200 pgmedge | pnminvert | pgmtoppm `randcolor`
202 elif [ $N = 4 ]; then
203 ppmspread 71 $tmp_ppm1 > $tmp_ppm2
204 pnmarith -add $tmp_ppm1 $tmp_ppm2
206 elif [ $N = 5 ]; then
207 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
208 pnmarith -multiply $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
209 pnmflip -tb $tmp_ppm3 | ppmnorm > $tmp_ppm2
210 pnmarith -multiply $tmp_ppm1 $tmp_ppm2
212 elif [ $N = 6 ]; then
215 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
216 elif [ $N2 = 1 ]; then
217 pnmflip -tb $tmp_ppm1 > $tmp_ppm2
219 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
220 pnmflip -tb $tmp_ppm2 > $tmp_ppm3
221 cp $tmp_ppm3 $tmp_ppm2
224 pnmarith -difference $tmp_ppm1 $tmp_ppm2
226 elif [ $N = 7 ]; then
229 ppmtopgm $tmp_ppm1 | pgmedge > $tmp_ppm2
230 pnmarith -difference $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
231 cp $tmp_ppm3 $tmp_ppm1
235 elif [ $N = 8 ]; then
236 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
237 pnmarith -multiply $tmp_ppm1 $tmp_ppm2 | ppmrelief | ppmnorm | pnminvert
239 elif [ $N = 9 ]; then
240 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
241 pnmarith -subtract $tmp_ppm1 $tmp_ppm2 | ppmrelief | ppmtopgm | pgmedge
243 elif [ $N = 10 ]; then
244 ppmtopgm $tmp_ppm1 | pgmbentley | pgmtoppm `randcolor`
246 elif [ $N = 11 ]; then
247 pgmcrater -number 20000 -height $height -width $width | pgmtoppm `randcolor` > $tmp_ppm2
248 pnmarith -difference $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
249 pnmflip -tb $tmp_ppm3 | ppmnorm > $tmp_ppm2
250 pnmarith -multiply $tmp_ppm1 $tmp_ppm2
252 elif [ $N = 12 ]; then
253 ppmshift 30 $tmp_ppm1 | ppmtopgm | pgmoil | pgmedge | pgmtoppm `randcolor` > $tmp_ppm2
254 pnmarith -difference $tmp_ppm1 $tmp_ppm2
256 elif [ $N = 13 ]; then
257 ppmpat -madras $width $height | pnmdepth 255 > $tmp_ppm2
258 pnmarith -difference $tmp_ppm1 $tmp_ppm2
260 elif [ $N = 14 ]; then
261 ppmpat -tartan $width $height | pnmdepth 255 > $tmp_ppm2
262 pnmarith -difference $tmp_ppm1 $tmp_ppm2
264 elif [ $N = 15 ]; then
265 ppmpat -camo $width $height | pnmdepth 255 | ppmshift 50 > $tmp_ppm2
266 pnmarith -multiply $tmp_ppm1 $tmp_ppm2
268 elif [ $N = 16 ]; then
269 pgmnoise $width $height | pgmedge | pgmtoppm `randcolor` > $tmp_ppm2
270 pnmarith -difference $tmp_ppm1 $tmp_ppm2 | pnmdepth 255 | pnmsmooth
277 # Grab a frame and frob it. leave it in $tmp_ppm3.
282 while [ ! -f $tmp_ppm1 ]; do
283 if [ "$use_stdin" != true ]; then
286 cp $tmp_ppmS $tmp_ppm0
287 cp $tmp_ppm0 $tmp_ppm1
293 if [ "$screen_width" != "" ]; then
294 frob | pnmscale -width $screen_width > $tmp_ppm3
299 rm -f $tmp_ppm1 $tmp_ppm2
303 # Kill off the xv subprocess, if it's running
306 if [ "$pid" != "" ]; then
308 if [ "$verbose" = true ]; then
309 echo "killing pid $pid..." >&2
312 # need to do this to avoid "6898 Terminated" messages!
313 # apparently one can't redirect the output of the builtin `kill' command.
314 # ( sh -c "kill $pid" ) >/dev/null 2>/dev/null </dev/null
316 # wtf? that doesn't work either. Is it writing to /dev/tty??
317 kill $pid >/dev/null 2>&1
323 # called when this process is signalled (for cleanup)
326 if [ "$verbose" = true ]; then
327 echo "trapped signal!" >&2
338 trap my_trap 1 2 3 6 9 13 15
340 if [ "$use_stdin" = true ]; then
346 # Loop grabbing and frobbing images.
348 # If we're running on the root, run xv in the foreground (with -exit)
351 # If we're running in a window, spawn xv in the background; then when
352 # it's time to put up the new image, kill off the currently-running xv.
354 if [ "$verbose" = true ]; then
357 whack >/dev/null 2>&1
362 if [ ! -s $tmp_ppm3 ]; then
363 echo "$0: no image grabbed" >&2
365 elif [ "$use_stdout" = true ]; then
373 pnmtosgi < $tmp_ppm3 > $tmp_ppm2
376 if [ -s $tmp_ppm2 ]; then
377 if [ "$verbose" = true ]; then
378 echo "launching xv $xvargs $tmp_ppm2" >&2
382 mv $tmp_ppm2 $tmp_ppm0
383 xv $xvargs $tmp_ppm0 &
385 # this doesn't work -- leaves xv processes around, instead of stray xset
388 # # cat the file so that we can nuke it without racing against xv.
389 # cat $tmp_ppm2 | xv $xvargs - &
404 # to find stray xv data:
405 # xwininfo -root -children|grep 'xv image comments' | awk '{print "xkill -id ", $1}'