path: root/doc/concept

#!/bin/bash

# scrotty — Framebuffer screenshot program
# 
# Copyright © 2014  Mattias Andrée (m@maandree.se)
# 
# This program 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, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


f=0
while [ -e /dev/fb$f ]; do
    pathname=fb$f.png
    if [ -e $pathname ]; then
	i=2
	while [ -e $pathname.$i ]; do
	    (( i++ ))
	done
	pathname=$pathname.$i
    fi
    (
	echo P3
	cat /sys/class/graphics/fb$f/virtual_size | sed -e 's/,/ /'
	echo 255
	(echo 'ibase=16;'; cat /dev/fb$f | od -t x4 -v | cut -d ' ' -f 1 --complement |
	    sed -e 's/\(..\)\(..\)\(..\)\(..\)\( \|$\)/\2 \3 \4 /g' |
	    sed -e 's/ /\n/g' | sed -e '/^$/d' -e 'y/abcedf/ABCEDF/') | bc
    ) | convert /dev/stdin $pathname
    (( f++ ))
done

exit 0