From 8d22e4bec3d21f2f99c2d6094d14aaa88865bcb8 Mon Sep 17 00:00:00 2001
From: yexo <yexo@openttd.org>
Date: Sat, 9 May 2009 19:45:02 +0000
Subject: [PATCH] (svn r16262) -Fix [NoAI]: Check slopes passed to the API
 better for validity

---
 src/ai/api/ai_tile.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/ai/api/ai_tile.cpp b/src/ai/api/ai_tile.cpp
index f5bf96f1a8..70bb1fb835 100644
--- a/src/ai/api/ai_tile.cpp
+++ b/src/ai/api/ai_tile.cpp
@@ -73,14 +73,14 @@
 
 /* static */ bool AITile::IsSteepSlope(Slope slope)
 {
-	if (slope == SLOPE_INVALID) return false;
+	if ((slope & ~(SLOPE_ELEVATED | SLOPE_STEEP | SLOPE_HALFTILE_MASK)) != 0) return false;
 
 	return ::IsSteepSlope((::Slope)slope);
 }
 
 /* static */ bool AITile::IsHalftileSlope(Slope slope)
 {
-	if (slope == SLOPE_INVALID) return false;
+	if ((slope & ~(SLOPE_ELEVATED | SLOPE_STEEP | SLOPE_HALFTILE_MASK)) != 0) return false;
 
 	return ::IsHalftileSlope((::Slope)slope);
 }
@@ -124,9 +124,7 @@
 
 /* static */ AITile::Slope AITile::GetComplementSlope(Slope slope)
 {
-	if (slope == SLOPE_INVALID) return SLOPE_INVALID;
-	if (IsSteepSlope(slope)) return SLOPE_INVALID;
-	if (IsHalftileSlope(slope)) return SLOPE_INVALID;
+	if ((slope & ~SLOPE_ELEVATED) != 0) return SLOPE_INVALID;
 
 	return (Slope)::ComplementSlope((::Slope)slope);
 }