From 04efb67f21f541bb743c0df4fd59b4c63dd2bb77 Mon Sep 17 00:00:00 2001
From: Travis Howell
Date: Thu, 20 Apr 2006 07:01:55 +0000
Subject: Fix mistake in vertical scrolling in FF

svn-id: r22051
---
 engines/simon/simon.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/engines/simon/simon.cpp b/engines/simon/simon.cpp
index ca6f2f5728..f646288d78 100644
--- a/engines/simon/simon.cpp
+++ b/engines/simon/simon.cpp
@@ -2632,16 +2632,17 @@ void SimonEngine::scrollEvent() {
 	uint x, y;
 
 	if (_scrollXMax == 0) {
+		uint screenSize = 8 * _screenWidth;
 		if (_scrollFlag < 0) {
-			memmove(dst + 8 * _screenWidth, dst, (_scrollWidth - 8) * _screenHeight);
+			memmove(dst + screenSize, dst, _scrollWidth * _screenHeight - screenSize);
 		} else {
-			memmove(dst, dst + 8 * _screenWidth, (_scrollWidth - 8) * _screenHeight);
+			memmove(dst, dst + screenSize, _scrollWidth * _screenHeight - screenSize);
 		}
 
 		y = _scrollY - 8;
 
 		if (_scrollFlag > 0) {
-			dst += (_screenHeight - 8) * _screenWidth;
+			dst += _screenHeight * _screenWidth - screenSize;
 			y += 488;
 		}
 
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