From 75806cd73c45278105ac4a3326ba7c80e86618ba Mon Sep 17 00:00:00 2001
From: Torbjörn Andersson
Date: Wed, 1 Jan 2014 19:48:17 +0100
Subject: VIDEO: Fix Smacker palette upscaling to match Multimedia Wiki

The Multimedia Wiki suggests using a lookup table, but this should
produce the same result.
---
 video/smk_decoder.cpp | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'video')

diff --git a/video/smk_decoder.cpp b/video/smk_decoder.cpp
index 3dbcebcde4..868050e988 100644
--- a/video/smk_decoder.cpp
+++ b/video/smk_decoder.cpp
@@ -732,10 +732,11 @@ void SmackerDecoder::SmackerVideoTrack::unpackPalette(Common::SeekableReadStream
 
 			assert(g < 0xc0 && b < 0xc0);
 
-			// upscale to full 8-bit color values by multiplying by 4
-			*pal++ = b * 4;
-			*pal++ = g * 4;
-			*pal++ = r * 4;
+			// upscale to full 8-bit color values. The Multimedia Wiki suggests
+			// a lookup table for this, but this should produce the same result.
+			*pal++ = (b * 4 + b / 16);
+			*pal++ = (g * 4 + g / 16);
+			*pal++ = (r * 4 + r / 16);
 		}
 	}
 
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