add option to optimize PNG images with optipng

This can decrease package size by optimizing PNG image size. Images are
just stored with better compression and/or filter options. The actual
image content is not altered.

Additionally this can automatically fix broken PNG images which caused
some trouble lately.

Signed-off-by: Christian Hesse <mail@eworm.de>
Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/doc/PKGBUILD.5.txt b/doc/PKGBUILD.5.txt
index c95c41d8..10980aba 100644
--- a/doc/PKGBUILD.5.txt
+++ b/doc/PKGBUILD.5.txt
@@ -296,6 +296,9 @@ underscore and the architecture name e.g., 'replaces_x86_64=()'.
 	*upx*;;
 		Compress binary executable files using UPX.
 
+	*optipng*;;
+		Optimize PNG images with optipng.
+
 	*ccache*;;
 		Allow the use of ccache during build. More useful in its negative
 		form `!ccache` with select packages that have problems building