Publish Vulpes Preview 15 sources for desktop, Android and Tundra
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323
gaia/tools/png_recompress.sh
Executable file
323
gaia/tools/png_recompress.sh
Executable file
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#!/bin/sh
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###############################################################################
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# Option variables
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opt_verbose=no
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opt_recursive=no
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opt_backup=no
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opt_keepgoing=no
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opt_optipng_args="-o7 -strip all -clobber -quiet"
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opt_optipng_args_nostrip="-o7 -clobber -quiet"
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opt_advpng_args="-z -4 -q"
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opt_help=no
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opt_paths=""
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###############################################################################
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# Other globals
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# Temporary directory and log file used through the script
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tmpdir=`mktemp -d -t tmp.XXXXXXXXXX`
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if [ $? -ne 0 ]; then
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printf "error: Cannot create a temporary directory"
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exit 1
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fi
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tmplog=`mktemp -t tmp.XXXXXXXXXX`
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if [ $? -ne 0 ]; then
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printf "error: Cannot create a temporary log file"
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exit 1
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fi
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trap 'rm -rf "$tmpdir $tmplog"' EXIT INT TERM HUP
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size_cmd="printf 1" # Command used to obtain the size of a file
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total_src_size="0" # Total size of the source files
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total_comp_size="0" # Total size of the compressed files
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processed_files="0" # Number of files having been processed
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###############################################################################
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# Print the help message
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print_help() {
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printf "Usage: `basename $0` [OPTION...] [PATH...]
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Recompresses PNG files using the 'optipng' and 'advpng' tools.
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Application options:
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-v, --verbose Print information on the files being processed
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-r, --recursive Recurse into subdirectories and process all files
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-b, --backup Keep a backup of the modified files
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-k, --keepgoing Do not stop in case of errors
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Compression options:
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--optipng-args Arguments passed to optipng (default: $opt_optipng_args)
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--advpng-args Arguments passed to advpng (default: $opt_advpng_args)
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Help options:
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-h, --help Show this help message
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"
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}
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suggest_help() {
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printf "Try \``basename $0` --help' for more information\n"
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}
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###############################################################################
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# Parse the program arguments
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parse_args() {
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# Set the options variables depending on the passed arguments
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while [ $# -gt 0 ]; do
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if [ `expr "$1" : "^-"` -eq 1 ]; then
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if [ $1 = "-v" ] || [ $1 = "--verbose" ]; then
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shift
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opt_verbose=yes
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elif [ $1 = "-r" ] || [ $1 = "--recursive" ]; then
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shift
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opt_recursive=yes
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elif [ $1 = "-b" ] || [ $1 = "--backup" ]; then
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shift
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opt_backup=yes
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elif [ $1 = "-k" ] || [ $1 = "--keepgoing" ]; then
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shift
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opt_keepgoing=yes
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elif [ $1 = "--optipng-args" ]; then
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if [ $# -le 1 ]; then
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printf "error: No argument specified for --optipng-args\n"
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suggest_help
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exit 1
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else
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opt_optipng_args="$2"
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opt_optipng_args_nostrip=`echo $2 | sed -e 's/-strip all//'`
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shift 2
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fi
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elif [ $1 = "--advpng-args" ]; then
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if [ $# -le 1 ]; then
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printf "error: No argument specified for --advpng-args\n"
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suggest_help
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exit 1
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else
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opt_advpng_args="$2"
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shift 2
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fi
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elif [ $1 = "-h" ] || [ $1 = "--help" ]; then
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opt_help=yes
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shift 1
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else
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printf "error: Unknown option $1\n"
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exit 1
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fi
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else
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# No more arguments, the following parameters will be paths
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break
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fi
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done
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if [ $# -eq 0 ] && [ $opt_help != yes ]; then
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printf "error: no files specified\n"
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suggest_help
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exit 1
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fi
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# Gather all the paths
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while [ $# -gt 0 ]; do
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opt_paths="$opt_paths$1\n"
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shift
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done
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# Adjust the arguments
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if [ $opt_backup = yes ]; then
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opt_optipng_args="$opt_optipng_args -backup"
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fi
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}
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###############################################################################
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# Check for programs
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check_optipng_version() {
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version=$(optipng --version | head -n 1)
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version="${version%%: Advanced PNG optimizer.}"
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version="${version##OptiPNG version }"
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version="${version##OptiPNG }"
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if [ ${#version} -le 3 ]; then
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version="$version.0"
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fi
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if [ "$version" \< 0.7.0 ]; then
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printf "error: the version of optipng you have installed ($version) is"\
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" too old, you need at least version 0.7.0 for this script to work correctly\n"
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exit 1
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fi
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}
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check_programs() {
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which optipng 1>/dev/null 2>/dev/null
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if [ $? -ne 0 ]; then
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printf "error: optipng not found\n"
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exit 1;
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fi
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check_optipng_version
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which advpng 1>/dev/null 2>/dev/null
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if [ $? -ne 0 ]; then
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printf "error: advpng not found\n"
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exit 1;
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fi
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if stat --printf %s . 1>/dev/null 2>/dev/null; then
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size_cmd="stat --printf %s"
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elif stat -f %z . 1>/dev/null 2>/dev/null; then
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size_cmd="stat -f %z"
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fi
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}
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###############################################################################
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# Recompress all files in a directory, if recursive behavior was requested will
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# recurse in all subdirectories
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recompress_dir() {
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local files
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if [ $opt_recursive = yes ]; then
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files=`find "$1" -iname "*.png" -type f`
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else
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files=`find "$1" -maxdepth 1 -iname "*.png" -type f`
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fi
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mkfifo "$tmpdir/files_pipe"
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printf -- "$files\n" > "$tmpdir/files_pipe" &
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while read -r fd; do
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recompress_file "$fd"
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done < "$tmpdir/files_pipe"
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}
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###############################################################################
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# Recompress a single file using the specified options
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recompress_file() {
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local rv=0
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local apng=0
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local src_size=`$size_cmd "$1"`
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if [ $opt_backup = yes ]; then
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if [ -e "$1.bak" ] ; then
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printf "error: backup file $1.bak already exists\n"
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if [ $opt_keepgoing = no ]; then
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exit 1
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fi
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else
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cp -p "$1" "$1.bak"
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fi
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fi
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optipng -o0 -simulate "$1" 1>"$tmplog" 2>"$tmplog"
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grep -q APNG "$tmplog"
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apng=$?
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if [ $apng -eq 0 ]; then
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# Do not strip animated PNG files otherwise the frames will be gone
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optipng $opt_optipng_args_nostrip "$1"
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rv=$?
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else
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optipng $opt_optipng_args "$1"
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rv=$?
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fi
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if [ $rv -ne 0 ]; then
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printf "error: optipng $opt_optipng_args \"$1\" returned $rv\n"
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if [ $opt_keepgoing = no ]; then
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exit 1
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fi
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fi
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if [ $apng -ne 0 ]; then
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# Do not invoke advpng on animated PNG files as it will strip the frames
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advpng $opt_advpng_args "$1"
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rv=$?
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if [ $rv -ne 0 ]; then
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printf "error: advpng $opt_optipng_args \"$1\" returned $rv\n"
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if [ $opt_keepgoing = no ]; then
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exit 1
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fi
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fi
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fi
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local comp_size=`$size_cmd "$1"`
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local ratio=`compression_ratio $src_size $comp_size`
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if [ $opt_verbose = yes ]; then
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printf "$1 $src_size $comp_size $ratio\n"
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fi
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total_src_size=$((total_src_size + src_size))
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total_comp_size=$((total_comp_size + comp_size))
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processed_files=$((processed_files + 1))
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}
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###############################################################################
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# Prints out the compression ratio, $1 is the source file size, $2 is the
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# compressed file size
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compression_ratio() {
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echo "scale=3;
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result = $2.0 / $1.0;
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if (result >= 0 && result < 1) {
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print \"0\";
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}
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if (result == 0) {
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print \".\";
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}
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print result;" | bc
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}
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###############################################################################
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# Main script
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parse_args "$@"
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check_programs
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if [ $opt_help = yes ] || [ $# -eq 0 ]; then
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print_help
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exit 0
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fi
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# Process all the specified paths
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mkfifo "$tmpdir/paths_pipe"
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printf -- "$opt_paths" > "$tmpdir/paths_pipe" &
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while read -r fd; do
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if [ -f "$fd" ]; then
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recompress_file "$fd"
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elif [ -d "$fd" ]; then
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recompress_dir "$fd"
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elif ! [ -e "$fd" ]; then
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printf "error: $fd no such file or directory\n"
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if [ $opt_keepgoing = no ]; then
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exit 1
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fi
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else
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printf "warning: skipping $fd, as it is neither a file nor a directory\n"
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fi
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done < "$tmpdir/paths_pipe"
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if [ $opt_verbose = yes ]; then
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printf "
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Number of files processed: $processed_files
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Total size of the files prior to recompression: $total_src_size
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Total size of the files after recompression: $total_comp_size
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Compression ratio: `compression_ratio $total_src_size $total_comp_size`
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"
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fi
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