From 140f3aa2801669a23a454edef0fbf88a91f65bc3 Mon Sep 17 00:00:00 2001
From: taigacon <taigacon@gmail.com>
Date: Mon, 5 Mar 2018 22:10:41 +0800
Subject: [PATCH] Fix png_set_option to work.

---
 png.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/png.c b/png.c
index 88cf9e743..cc6029ecc 100644
--- a/png.c
+++ b/png.c
@@ -4344,7 +4344,7 @@ png_set_option(png_structrp png_ptr, int option, int onoff)
       png_uint_32 setting = (2U + (onoff != 0)) << option;
       png_uint_32 current = png_ptr->options;
 
-      png_ptr->options = (png_uint_32)(((current & ~mask) | setting) & 0xff);
+      png_ptr->options = (png_uint_32)((current & ~mask) | setting);
 
       return (int)(current & mask) >> option;
    }