From 3ce395544fad2200a4e3a3d26ba7a17b83b826e1 Mon Sep 17 00:00:00 2001
From: Niels Martin Hansen <nielsm@aegisub.org>
Date: Thu, 4 Jun 2009 02:28:46 +0000
Subject: [PATCH] Adjust calculation of secondary colour for checkerboard
 pattern in dummy video provider. New calculation produces better results for
 dark colours, the old calculation produced very high contrast patterns for
 dark colours.

Originally committed to SVN as r3015.
---
 aegisub/src/video_provider_dummy.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/aegisub/src/video_provider_dummy.cpp b/aegisub/src/video_provider_dummy.cpp
index 61104443f..ccfc7943d 100644
--- a/aegisub/src/video_provider_dummy.cpp
+++ b/aegisub/src/video_provider_dummy.cpp
@@ -68,7 +68,8 @@ void DummyVideoProvider::Create(double _fps, int frames, int _width, int _height
 
 	unsigned char h, s, l, lr, lg, lb; // light variants
 	rgb_to_hsl(r, g, b, &h, &s, &l);
-	l = 255 - (255 - l) / 2;
+	l += 24;
+	if (l < 24) l -= 48;
 	hsl_to_rgb(h, s, l, &lr, &lg, &lb);
 
 	if (pattern) {