From Ulrich Hertlein, "not sure how severe this is but I believe there's a bug in

Texture.cpp:applyTexImage2D_subload:

<code>
unsigned char* data = = (unsigned char*)image->data();
if (needImageRescale) {
 // allocates rescale buffer
 data = new unsigned char[newTotalSize];

 // calls gluScaleImage into the data buffer
}

const unsigned char* dataPtr = image->data();
// subloads 'dataPtr'

// deletes 'data'
</code>

In effect, the scaled data would never be used.

I've also replaced bits of duplicate code in Texture1D/2D/2DArray/3D/Cubemap/Rectangle
that checks if the texture image can/should be unref'd with common functionality in
Texture.cpp.

"

src/osg/Texture2D.cpp

@@ -248,13 +248,11 @@ void Texture2D::apply(State& state) const
         // update the modified tag to show that it is upto date.
         getModifiedCount(contextID) = image->getModifiedCount();
 
-        if (state.getMaxTexturePoolSize()==0 &&
-            _unrefImageDataAfterApply &&
-            areAllTextureObjectsLoaded() &&
-            image->getDataVariance()==STATIC)
+        // unref image data?
+        if (isSafeToUnrefImageData(state) && image->getDataVariance()==STATIC)
         {
             Texture2D* non_const_this = const_cast<Texture2D*>(this);
-            non_const_this->_image = 0;
+            non_const_this->_image = NULL;
         }
 
         // in theory the following line is redundent, but in practice