fdroiddata/tools/png-pre-compress

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#!/usr/bin/env sh
set -e
set -x
for f in $(dirname $0)/../metadata/*/*/*/*.jp*g; do
exiftool -all= $f
done
for f in `find $(dirname $0)/../metadata -type f -name \*.png`; do
echo $f | grep -Eo '\.9\.png$' && continue # do not optimized 9-patch, it breaks them
tmpfile=$(mktemp)
aapt singleCrunch -v -i $f -o $tmpfile
exiftool -all= $tmpfile
mv $tmpfile $f
done
for f in metadata/*/*/*Screenshots/*.png; do
exiftool -all= $f
tmpfile=$(mktemp)
(zopflipng --filters=01234mepb --lossy_8bit --lossy_transparent -y $f $tmpfile && mv $tmpfile $f) &
done