wireshark/tools/compress-pngs.sh
Gerald Combs 9ed7568f70 Recompress PNGs.
Recompress PNGs using the current versions of various compressors:

  optipng 0.7.6
  advpng 1.20
  advdef 1.20
  pngcrush 1.8.1

Parallelize PNG compression. Note why we're not using a couple of other
compression utilities.

Change-Id: I52757d0bc2d424013e7f00b693a0f5378427cc31
Reviewed-on: https://code.wireshark.org/review/16209
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>
2016-06-30 15:41:32 +00:00

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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
#
# 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 2
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
FILE_LIST_CMD="find . -type f -name \"*.png\""
if [ -n "$1" ] ; then
FILE_LIST_CMD="echo $1"
fi
# Other utilities:
# PNGOUT (http://advsys.net/ken/utils.htm). Closed source.
# pngquant (https://pngquant.org/). Lossy.
JOBS=8
export FILE_LIST_CMD
(
echo -n "PNG_FILES ="
bash -c "$FILE_LIST_CMD" | while read PNG_FILE ; do
echo -e " \\"
echo -e -n "\t${PNG_FILE}"
done
cat <<"FIN"
all: $(PNG_FILES)
$(PNG_FILES): FORCE
@echo Compressing $@
@hash optipng 2>/dev/null && optipng -o3 -quiet "$@"
@hash advpng 2>/dev/null && advpng -z -4 "$@"
@hash advdef 2>/dev/null && advdef -z -4 "$@"
@hash pngcrush 2>/dev/null && pngcrush -q -ow -brute -reduce -noforce "$@" pngout.$$$$.png
FORCE:
FIN
) | make -j $JOBS -f -