From 0e5bb2d99a1bbf90a6a07803e0a7527b3e824b49 Mon Sep 17 00:00:00 2001
From: Shunsuke Michii <harukasan@me.com>
Date: Wed, 29 Jun 2016 21:24:39 +0900
Subject: [PATCH] Add const keyword to arguments.

---
 webp/encode.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/webp/encode.go b/webp/encode.go
index a9bc8ba..26689c3 100644
--- a/webp/encode.go
+++ b/webp/encode.go
@@ -15,7 +15,7 @@ static void free_WebPPicture(WebPPicture* webpPicture) {
 	free(webpPicture);
 }
 
-static int webpEncodeGray(WebPConfig *config, WebPPicture *picture) {
+static int webpEncodeGray(const WebPConfig *config, WebPPicture *picture) {
 	int ok = 0;
 	const int c_width = (picture->width + 1) >> 1;
 	const int c_height = (picture->height + 1) >> 1;