From a7fa47e3e994a056420226f68bf4a1bb107e4ddb Mon Sep 17 00:00:00 2001
From: Peter Dave Hello <hsu@peterdavehello.org>
Date: Thu, 2 Jan 2020 20:19:35 +0000
Subject: [PATCH] Compress PNG images losslessly with zopflipng

---
 tools/png-pre-compress | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/png-pre-compress b/tools/png-pre-compress
index fe9a8f411..50c968e62 100755
--- a/tools/png-pre-compress
+++ b/tools/png-pre-compress
@@ -8,6 +8,7 @@ for f in `find $(dirname $0)/../app/src/ -type f -name \*.png`; do
     tmpfile=$(mktemp)
     aapt singleCrunch -v -i $f -o $tmpfile
     exiftool -all= $tmpfile
+    zopflipng--iterations=50 --keepchunks=iCCP --lossy_transparent --splitting=3 -my $tmpfile $tmpfile
     mv $tmpfile $f
 done