From 493c5842a1a4fc966b3cf07fa20032a340712b73 Mon Sep 17 00:00:00 2001
From: Rogier <rogier777@gmail.com>
Date: Thu, 8 May 2014 14:21:58 +0200
Subject: [PATCH] Fix conversion of libgd alpha value: libgd uses 0..127 (not
 255)

---
 Color.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Color.h b/Color.h
index 22bdbc5..02cf999 100644
--- a/Color.h
+++ b/Color.h
@@ -12,8 +12,8 @@ struct Color {
 	Color(const std::string &s, int alpha = 1);
 	Color &operator=(const Color &c);
 	unsigned to_uint() const { return (unsigned(a) << 24) + (unsigned(r) << 16) + (unsigned(g) << 8) + unsigned(b); }
-	//libgd treats 255 as transparent, and 0 as opaque ...
-	int to_libgd() const { return ((0xff - int(a)) << 24) + (int(r) << 16) + (int(g) << 8) + int(b); }
+	//libgd treats 127 as transparent, and 0 as opaque ...
+	int to_libgd() const { return (((0xff - int(a)) >> 1) << 24) + (int(r) << 16) + (int(g) << 8) + int(b); }
 	uint8_t r;
 	uint8_t g;
 	uint8_t b;