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#!/bin/sh
# Copyright © 2009-2017 Jakub Wilk
# Copyright © 2017 Kaelin Laundry
#
# This package is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 dated June, 1991.
set -e
usage()
{
cat <<EOF
Usage: $0 [option...] <filename.png|->
Options:
-c <N> grab from /dev/ttyN
-C <N> grab from /dev/ttyN, for slower devices
-d <dev> use framebuffer device <dev>
-i turn on PNG interlacing
-s <N> sleep <N> seconds before making screenshot
-? display this help and exit
If the specified destination is "-", the PNG output is piped to stdout.
EOF
exit 1
}
not_supported_option()
{
printf -- 'fbgrab: the %s option is not supported.\n' "$1" >&2
exit 3
}
no_ppm2png()
{
printf -- 'fbgrab: no PPM -> PNG conversion tool found.\nPlease install Netpbm or GraphicsMagick, or ImageMagick.\n' >&2
exit 4
}
current_vt=''
grab_vt=''
wait_after_switch=0
wait_before_switch=0
device=${FRAMEBUFFER:-/dev/fb0}
interlace=''
while getopts 'b:c:C:d:f:h:is:w:?' arg
do
case "$arg" in
b) not_supported_option -b;;
c) grab_vt="$OPTARG"; wait_after_switch=0;;
C) grab_vt="$OPTARG"; wait_after_switch=3;;
d) device="$OPTARG";;
f) not_supported_option -f;;
h) not_supported_option -h;;
i) interlace=1;;
s) wait_before_switch="$((OPTARG))";;
w) not_supported_option "$OPTARG";;
[?]) usage;;
esac
done
shift $(($OPTIND - 1))
[ $# -ne 1 ] && usage
if command -v pnmtopng >/dev/null 2>/dev/null
then
ppm2png()
{
[ "$1" = "-" ] || exec > "$1"
pnmtopng ${interlace:+-interlace} -
}
elif gm -version 2>/dev/null | grep -q -w GraphicsMagick
then
ppm2png()
{
gm convert ${interlace:+-interlace Line} PPM:- "PNG:$1"
}
elif convert -version 2>/dev/null | grep -q -w ImageMagick
then
ppm2png()
{
convert ${interlace:+-interlace Line} PPM:- "PNG:$1"
}
else
no_ppm2png
fi
sleep "$wait_before_switch"
if [ -n "$grab_vt" ]
then
current_vt=$(fgconsole)
chvt "$grab_vt"
fi
sleep "$wait_after_switch"
fbcat "$device" | ppm2png "$1"
if [ -n "$current_vt" ]
then
chvt "$current_vt"
fi
# vim:ts=2 sts=2 sw=2 et
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