From a36d45e68b99489f825c12e7d0328734e60c366c Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 23 Jul 2003 08:18:19 +0000
Subject: [PATCH] Added check to allocateImage() so that if the pixel size
 wouldn't be computed unless valid _data already existed on the object.

---
 src/osg/Image.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/osg/Image.cpp b/src/osg/Image.cpp
index 0dac9fa23..0bfcd0909 100644
--- a/src/osg/Image.cpp
+++ b/src/osg/Image.cpp
@@ -302,7 +302,9 @@ void Image::allocateImage(int s,int t,int r,
 {
     _mipmapData.clear();
 
-    unsigned int previousTotalSize = computeRowWidthInBytes(_s,_pixelFormat,_dataType,_packing)*_t*_r;
+    unsigned int previousTotalSize = 0;
+    
+    if (_data) previousTotalSize = computeRowWidthInBytes(_s,_pixelFormat,_dataType,_packing)*_t*_r;
     
     unsigned int newTotalSize = computeRowWidthInBytes(s,format,type,packing)*t*r;