From 902e0699b11095d61bae29e3ca9b9d18482fdec2 Mon Sep 17 00:00:00 2001
From: Johannes Schickel
Date: Fri, 25 Sep 2009 01:00:34 +0000
Subject: Add comment about why r44322 was needed.

svn-id: r44323
---
 engines/scumm/gfx.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'engines/scumm')

diff --git a/engines/scumm/gfx.cpp b/engines/scumm/gfx.cpp
index b8e40b557d..008dfb3793 100644
--- a/engines/scumm/gfx.cpp
+++ b/engines/scumm/gfx.cpp
@@ -3189,6 +3189,10 @@ void Gdi16Bit::writeRoomColor(byte *dst, byte color) const {
 }
 
 void Gdi::writeRoomColor(byte *dst, byte color) const {
+	// As described in bug #1294513 "FOA/Amiga: Palette problem (Regression)"
+	// the original AMIGA version of Indy4: The Fate of Atlantis allowed
+	// overflowing of the palette index. To have the same result in our code,
+	// we need to do an logical AND 0xFF here to keep the result in [0, 255].
 	*dst = _roomPalette[(color + _paletteMod) & 0xFF];
 }
 
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