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#!/bin/bash
#
# compress-pngs.sh
# Run various compression and optimization utilities on one or more PNGs
#
# Wireshark - Network traffic analyzer
# By Gerald Combs <gerald@wireshark.org>
# Copyright 2013 Gerald Combs
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
while getopts h OPTCHAR
do
case $OPTCHAR in
h|?)
echo "Usage: compress-pngs.sh file1.png [file2.png] ..." 1>&1
exit 0
;;
esac
done
# Other utilities:
# PNGOUT (http://advsys.net/ken/utils.htm). Closed source.
# pngquant (https://pngquant.org/). Lossy.
JOBS=8
PNG_FILES=$(printf "%q " "$@")
export PNG_FILES
(
cat <<"FIN"
all: $(PNG_FILES)
$(PNG_FILES): FORCE
@echo Compressing $@
@hash oxipng 2>/dev/null && oxipng --opt 4 --strip safe "$@"
@hash optipng 2>/dev/null && optipng -o3 -quiet "$@"
@hash advpng 2>/dev/null && advpng --recompress --shrink-insane "$@"
@hash advdef 2>/dev/null && advdef --recompress --shrink-insane "$@"
@hash pngcrush 2>/dev/null && pngcrush -q -ow -brute -reduce -noforce "$@" pngout.$$$$.png
FORCE:
FIN
) | make -j $JOBS -f -
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