Do Silverlight or WPF applications use Direct2D or DirectWrite to render fonts and UI?

I found a lot of info开发者_如何转开发rmation that IE9 uses DirectWrite and Direct2D instead of GDI for rendering UI. Is the same true for WPF and Silverlight applications?

WPF renders on top of Direct3D 9 (preventing the use of Direct2D), but they do still use DirectWrite for the text rendering as of WPF 4.0 on Windows 7 (ref). Since DirectWrite exists separately from Direct2D, they are able to use the lower-level interfaces to DirectWrite and reimplement the rendering on top of Direct3D 9, similarly to how Direct2D provides its text acceleration.

No, WPF works on top of DirectX 9.