From ae3c9ddf3950c42cc68e1eca73fe84fdd8eddfd0 Mon Sep 17 00:00:00 2001
From: Simon Robertshaw <simon@hardwired.org.uk>
Date: Fri, 24 Aug 2012 20:36:23 +0100
Subject: Don't you just hate those fencepost errors... Stop going out of
 bounds when traversing the X axis with gravity mask.


diff --git a/src/simulation/Gravity.cpp b/src/simulation/Gravity.cpp
index e5daa65..552c02d 100644
--- a/src/simulation/Gravity.cpp
+++ b/src/simulation/Gravity.cpp
@@ -420,13 +420,13 @@ void Gravity::grav_mask_r(int x, int y, char checkmap[YRES/CELL][XRES/CELL], cha
 		*shapeout = 1;
 
 	int x1 = x, x2 = x;
-	while (x1 >= 0)
+	while (x1 >= 1)
 	{
 		if(checkmap[y][x1-1] || bmap[y][x1-1]==WL_GRAV)
 			break;
 		x1--;
 	}
-	while (x2 < XRES/CELL)
+	while (x2 < (XRES/CELL)-1)
 	{
 		if(checkmap[y][x2+1] || bmap[y][x2+1]==WL_GRAV)
 			break;
--
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