Fixed handling of Font implementations that don't handle multiple font resolutions.

include/osgText/Glyph

@@ -263,6 +263,9 @@ public:
     /** Resize any per context GLObject buffers to specified size. */
     virtual void resizeGLObjectBuffers(unsigned int maxSize);
 
+    /** create an image that maps all the associated Glyph's onto a single image, that is equivilant to what will be downloaded to the texture.*/
+    osg::Image* createImage();
+    
 protected:
 
     virtual ~GlyphTexture();