From 818b5230fb7c6152ea451822f5853db69fe13341 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Sat, 29 Mar 2008 09:59:23 +0000
Subject: [PATCH] From Sherman Wilcox with a little reorganisation from Robert
 Osfield, added test for 0 sized subloads, ignoring them to prevent a divide
 by zero error occuring on some buggy drivers.

---
 src/osgText/Font.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/osgText/Font.cpp b/src/osgText/Font.cpp
index d43de94bc..2abe0ea6a 100644
--- a/src/osgText/Font.cpp
+++ b/src/osgText/Font.cpp
@@ -861,6 +861,12 @@ void Font::Glyph::subload() const
         osg::notify(osg::WARN)<<"before Font::Glyph::subload(): detected OpenGL error '"<<gluErrorString(errorNo)<<std::endl;
     }
 
+    if(s() <= 0 || t() <= 0)
+    {
+        osg::notify(osg::INFO)<<"Font::Glyph::subload(): texture sub-image width and/or height of 0, ignoring operation."<<std::endl;      
+        return;
+    }
+
     glPixelStorei(GL_UNPACK_ALIGNMENT,getPacking());
 
     glTexSubImage2D(GL_TEXTURE_2D,0,