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#!/bin/bash
if ! which pngquant > /dev/null
then
echo "ERROR: pngquant not found"
exit 1
fi
if [ -z "$1" ]
then
WL_DIR=$(dirname $(dirname "$0"))
cd "$WL_DIR"
if ! [ -f src/wlapplication.cc ]
then
echo "ERROR: Cannot find the main directory of the Widelands source code."
exit 1
fi
dir="data"
else
dir="$1"
fi
echo "Running pngquant..."
tempfile="$(mktemp -d)/image.png"
i=0
skipped=0
saved=0
for image in $(find "$dir" -name '*.png')
do
((++i))
printf "\r[%5d] %-100s " "$i" "$image"
pngquant 256 < "$image" > "$tempfile"
oldsize=$(wc -c < "$image")
newsize=$(wc -c < "$tempfile")
if [ $newsize -lt $((oldsize * 95 / 100)) ] # Only accept images that have shrunk by at least 5%
then
mv "$tempfile" "$image"
((saved += oldsize - newsize))
else
((++skipped))
fi
done
printf "\n%d images converted, %d images skipped, %d bytes saved.\n" $((i - skipped)) $skipped $saved
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