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 xloadimage, xli, or xv
16 # to put it on the root window. This works out really nicely if you just
17 # feed some 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=$tmp-00000.rgb
45 # Figure out whether to use xloadimage, xli, or xv.
48 for prog in xloadimage xli xv ; do
52 if [ "$p" = "" ]; then p=. ; fi
53 if [ -x $p/$prog ]; then
60 if [ "$displayer" = "xloadimage" ]; then
61 displayer_args="-quiet"
63 displayer_root_args="-onroot"
64 elif [ "$displayer" = "xli" ]; then
65 displayer_args="-quiet"
67 displayer_root_args="-onroot -center -border black"
68 elif [ "$displayer" = "xv" ]; then
69 displayer_args="-quick24"
70 displayer_win_args="-geom +0+0"
71 displayer_root_args="-root -rmode 5 -noresetroot -rfg black -rbg black -viewonly"
73 echo "$0: neither xli nor xv found on \$PATH"
78 # Process command-line args
83 -display | -disp | -dis | -dpy | -d )
108 echo "VidWhacker, Copyright (c) 1999 Jamie Zawinski <jwz@jwz.org>" >&2
109 echo " http://www.jwz.org/xscreensaver/" >&2
111 echo "usage: $0 [-display dpy] [-verbose] [-root | -window]" >&2
112 echo " [-stdin] [-stdout] [-delay secs]" >&2
121 if [ "$onroot" = true ]; then
122 displayer_args="$displayer_args $displayer_root_args"
124 displayer_args="$displayer_args $displayer_win_args"
129 if [ "$use_stdout" = false ]; then
130 screen_width=`xdpyinfo 2>/dev/null |
131 sed -n 's/.* dimensions: *\([0-9]*\).*/\1/p'`
132 if [ "$screen_width" = "" ]; then
140 rm -f $tmp_rgb $tmp_ppm1 $tmp_ppm2 $tmp_ppm3 $tmp_ppm4
145 rm -f $tmp_ppm0 $tmp_ppmS
149 # Grab a frame of video. leaves it in $tmp_ppm1.
153 if [ $uname = IRIX ]; then
155 # SGI's "vidtomem" returns an SGI RGB image of the default video input,
156 # and has stupid non-overridable ouput-file-naming conventions. So, let
157 # it write its file; and then convert it to a pgm.
161 sgitopnm $tmp_rgb > $tmp_ppm1
163 # Cut off the close-captioning blips in the NTSC overscan region. YMMV.
164 # | pnmcut 12 7 695 477
166 elif [ $uname = Linux ]; then
168 # Marcus Herbert says the following works with his Connectix Qcam.
169 # Don't have qcam? Well, do something else then... and send me a patch.
173 # Friedrich Delgado Friedrichs says the following works if you have
176 # streamer -o $tmp_ppm1
180 echo "$0: don't know how to grab video on this OS." >&2
187 # Use perl to pick a random foreground/background color in pbm's syntax.
190 $perl -e 'srand(time ^ $$);
191 printf("#%02x%02x%02x-#%02x%02x%02x",
197 120+int(rand()*135))'
201 $perl -e "srand(time ^ $$); print int(rand() * $1)"
206 # Frobnicate the image in some random way.
210 w_h=`head -2 $tmp_ppm1 | tail -1`
211 width=`echo $w_h | awk '{print $1}'`
212 height=`echo $w_h | awk '{print $2}'`
216 if [ "$verbose" = true ]; then
217 echo "mode $N..." >&2
221 ppmtopgm $tmp_ppm1 | pgmedge | pgmtoppm `randcolor` | ppmnorm
223 elif [ $N = 1 ]; then
228 elif [ $N = 2 ]; then
229 ppmtopgm $tmp_ppm1 | pgmoil | pgmtoppm `randcolor`
231 elif [ $N = 3 ]; then
232 ppmrelief $tmp_ppm1 | ppmtopgm | pgmedge | ppmrelief | ppmtopgm |
233 pgmedge | pnminvert | pgmtoppm `randcolor`
235 elif [ $N = 4 ]; then
236 ppmspread 71 $tmp_ppm1 > $tmp_ppm2
237 pnmarith -add $tmp_ppm1 $tmp_ppm2
239 elif [ $N = 5 ]; then
240 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
241 pnmarith -multiply $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
242 pnmflip -tb $tmp_ppm3 | ppmnorm > $tmp_ppm2
243 pnmarith -multiply $tmp_ppm1 $tmp_ppm2
245 elif [ $N = 6 ]; then
248 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
249 elif [ $N2 = 1 ]; then
250 pnmflip -tb $tmp_ppm1 > $tmp_ppm2
252 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
253 pnmflip -tb $tmp_ppm2 > $tmp_ppm3
254 cp $tmp_ppm3 $tmp_ppm2
257 pnmarith -difference $tmp_ppm1 $tmp_ppm2
259 elif [ $N = 7 ]; then
262 ppmtopgm $tmp_ppm1 | pgmedge > $tmp_ppm2
263 pnmarith -difference $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
264 cp $tmp_ppm3 $tmp_ppm1
268 elif [ $N = 8 ]; then
269 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
270 pnmarith -multiply $tmp_ppm1 $tmp_ppm2 | ppmrelief | ppmnorm | pnminvert
272 elif [ $N = 9 ]; then
273 pnmflip -lr $tmp_ppm1 > $tmp_ppm2
274 pnmarith -subtract $tmp_ppm1 $tmp_ppm2 | ppmrelief | ppmtopgm | pgmedge
276 elif [ $N = 10 ]; then
277 ppmtopgm $tmp_ppm1 | pgmbentley | pgmtoppm `randcolor`
279 elif [ $N = 11 ]; then
280 pgmcrater -number 20000 -height $height -width $width | pgmtoppm `randcolor` > $tmp_ppm2
281 pnmarith -difference $tmp_ppm1 $tmp_ppm2 > $tmp_ppm3
282 pnmflip -tb $tmp_ppm3 | ppmnorm > $tmp_ppm2
283 pnmarith -multiply $tmp_ppm1 $tmp_ppm2
285 elif [ $N = 12 ]; then
286 ppmshift 30 $tmp_ppm1 | ppmtopgm | pgmoil | pgmedge | pgmtoppm `randcolor` > $tmp_ppm2
287 pnmarith -difference $tmp_ppm1 $tmp_ppm2
289 elif [ $N = 13 ]; then
290 ppmpat -madras $width $height | pnmdepth 255 > $tmp_ppm2
291 pnmarith -difference $tmp_ppm1 $tmp_ppm2
293 elif [ $N = 14 ]; then
294 ppmpat -tartan $width $height | pnmdepth 255 > $tmp_ppm2
295 pnmarith -difference $tmp_ppm1 $tmp_ppm2
297 elif [ $N = 15 ]; then
298 ppmpat -camo $width $height | pnmdepth 255 | ppmshift 50 > $tmp_ppm2
299 pnmarith -multiply $tmp_ppm1 $tmp_ppm2
301 elif [ $N = 16 ]; then
302 pgmnoise $width $height | pgmedge | pgmtoppm `randcolor` > $tmp_ppm2
303 pnmarith -difference $tmp_ppm1 $tmp_ppm2 | pnmdepth 255 | pnmsmooth
310 # Grab a frame and frob it. leave it in $tmp_ppm3.
315 while [ ! -f $tmp_ppm1 ]; do
316 if [ "$use_stdin" != true ]; then
319 cp $tmp_ppmS $tmp_ppm0
320 cp $tmp_ppm0 $tmp_ppm1
326 if [ "$screen_width" != "" ]; then
327 frob | pnmscale -width $screen_width > $tmp_ppm3
332 rm -f $tmp_ppm1 $tmp_ppm2
336 # Kill off the xli or xv subprocess, if it's running
339 if [ "$pid" != "" ]; then
341 if [ "$verbose" = true ]; then
342 echo "killing pid $pid..." >&2
345 # need to do this to avoid "6898 Terminated" messages!
346 # apparently one can't redirect the output of the builtin `kill' command.
347 # ( sh -c "kill $pid" ) >/dev/null 2>/dev/null </dev/null
349 # wtf? that doesn't work either. Is it writing to /dev/tty??
350 kill $pid >/dev/null 2>&1
356 # called when this process is signalled (for cleanup)
359 if [ "$verbose" = true ]; then
360 echo "trapped signal!" >&2
371 trap my_trap 1 2 3 6 9 13 15
373 if [ "$use_stdin" = true ]; then
379 # Loop grabbing and frobbing images.
381 # If we're running on the root, run xv or xli in the foreground
382 # (with -exit, if xv) and then wait.
384 # If we're running in a window, spawn xv or xli in the background; then
385 # when it's time to put up the new image, kill off the currently-running
388 if [ "$verbose" = true ]; then
391 whack >/dev/null 2>&1
396 if [ ! -s $tmp_ppm3 ]; then
397 echo "$0: no image grabbed" >&2
399 elif [ "$use_stdout" = true ]; then
407 # pnmtosgi < $tmp_ppm3 > $tmp_ppm2
409 mv $tmp_ppm3 $tmp_ppm2
411 if [ -s $tmp_ppm2 ]; then
412 if [ "$verbose" = true ]; then
413 echo "launching $displayer $displayer_args $tmp_ppm2" >&2
417 mv $tmp_ppm2 $tmp_ppm0
418 eval "$displayer $displayer_args $tmp_ppm0 &"
420 # this doesn't work -- leaves xv processes around, instead of stray xset
423 # # cat the file so that we can nuke it without racing against xv.
424 # cat $tmp_ppm2 | $displayer $displayer_args - &
439 # to find stray xv data:
440 # xwininfo -root -children|grep 'xv image comments' | awk '{print "xkill -id ", $1}'