From ed4f078fc83c9a93723c4edf517cc47723471973 Mon Sep 17 00:00:00 2001
From: Travis Howell
Date: Sun, 8 Oct 2006 08:47:33 +0000
Subject: Add invert box difference in Elvira 1

svn-id: r24194
---
 engines/agos/verb.cpp | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

(limited to 'engines/agos/verb.cpp')

diff --git a/engines/agos/verb.cpp b/engines/agos/verb.cpp
index e3c06bc8a7..cae3046516 100644
--- a/engines/agos/verb.cpp
+++ b/engines/agos/verb.cpp
@@ -894,12 +894,19 @@ void AGOSEngine::invertBox(HitArea * ha, byte a, byte b, byte c, byte d) {
 	do {
 		for (i = 0; i != w; ++i) {
 			color = src[i];
-			if (a >= color && b < color) {
-				if (c >= color)
-					color += d;
-				else
-					color -= d;
-				src[i] = color;
+			if (getGameType() == GType_ELVIRA1)  {
+				if (color & 1) {
+					color ^= 2;
+					src[i] = color;
+				}
+			} else {
+				if (a >= color && b < color) {
+					if (c >= color)
+						color += d;
+					else
+						color -= d;
+					src[i] = color;
+				}
 			}
 		}
 		src += _dxSurfacePitch;
-- 
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