From 48ba43aae51a0bc594efa43f721a47b582ec7048 Mon Sep 17 00:00:00 2001
From: Mike Primm <mike@primmhome.com>
Date: Tue, 9 Aug 2011 00:18:38 -0500
Subject: [PATCH] Check for overflow on biome lookup - prevent exceptions on
 some worlds

---
 src/main/java/org/dynmap/hdmap/TexturePack.java | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/dynmap/hdmap/TexturePack.java b/src/main/java/org/dynmap/hdmap/TexturePack.java
index c19de1a6..89a8c60d 100644
--- a/src/main/java/org/dynmap/hdmap/TexturePack.java
+++ b/src/main/java/org/dynmap/hdmap/TexturePack.java
@@ -885,8 +885,11 @@ public class TexturePack {
     }
     
     private static final int biomeLookup(int[] argb, int width, double rainfall, double temp) {
-        int t = (int)((1.0-temp)*(width-1));
-        int h = width - (int)(temp*rainfall*(width-1)) - 1;
+        int w = width-1;
+        int t = (int)((1.0-temp)*w);
+        int h = (int)((1.0 - (temp*rainfall))*w);
+        if(h > w) h = w;
+        if(t > w) t = w;
         return argb[width*h + t];
     }
 }