#!/bin/bash
# The MIT License (MIT)
#
# Copyright (c) 2011-2015 Ismaël Bouya http://www.normalesup.org/~bouya/
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

TMP_AVI=$(mktemp /tmp/outXXXXXXXXXX.avi)
GEOMETRY=`ffcast -s % echo "%D+%g"`

DISP=`echo $GEOMETRY | cut -d'+' -f1`
SIZE=`echo $GEOMETRY | cut -d'+' -f2`
X=`echo $GEOMETRY | cut -d'+' -f3`
Y=`echo $GEOMETRY | cut -d'+' -f4`

if [ -z "$1" ]; then
  OUTPUT=out.gif
else
  OUTPUT=${1}.gif
fi

ffmpeg -y -f x11grab -framerate 25 -video_size $SIZE -i $DISP+$X,$Y -codec:v huffyuv -vf crop="iw-mod(iw\,2):ih-mod(ih\,2)" $TMP_AVI
convert -set delay 10 -layers Optimize $TMP_AVI $OUTPUT