D3DXVECTOR2 scale(0.0f, 0.0f);
Taking into account GuyWithBeard's input (which is almost true because "normal" can vary from person to person) try to tweak 1.0f, 1.0f to some value that gives desired outcome.
I just remembered that 0.0f scaling would mean scaling an image to 0%, which is what you won't be looking for I believe.