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#!/bin/sh
# Copyright 2017 jstpcs <jstpcs at protonmail dot com>
# Copyright 2017 moviuro <moviuro at gmail dot com>
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
set -e
usage() {
cat << EOH
Usage: $0 [-s] <source file> <width> <height> : creates a wallpaper
-s : use a "safer" and slower method to get the background color
$0 -h : displays this help message
Example: $0 coolimage.png 1920 1080
EOH
exit ${1:-0}
}
die() {
echo "$1" && exit "${2:-1}"
}
if [ "$1" = "-h" ]; then
usage
fi
if [ "$1" = "-s" ]; then
getbg() {
# We get all hexa codes of all pixels in the picture, and pick the most
# frequent one... which should be the background color?
convert "$1" -format %c +dither -depth 5 histogram:info: |
sort -nr | head -1 | grep -Eo '#[A-F0-9]{6}'
}
shift
else
getbg() {
# We get the color of the top-left pixel.
convert "$1" -crop 1x1+0+0 -depth 8 txt: | grep -Eo '#[A-F0-9]{6}'
}
fi
if [ $# -ne 3 ]; then
usage 1 >&2
fi
[ -r "$1" ] || die "File $1 is not readable!"
inpfile="$1"
outfile="$(basename "$inpfile")"
width="$2"
height="$3"
bgcolor="$(getbg "$inpfile")"
# We use the `-resize ..x..\>` syntax to only shrink pictures. Enlarging is
# asking for trouble (artifacting, etc.)
convert "$inpfile" -gravity center -resize "${width}x${height}>" \
-background "$bgcolor" -extent "${width}x${height}" \
"${outfile%.*}-${width}x${height}.${outfile##*.}"
|
