Why is DirectFB not more widely used in GNU/Linux? Are there crippling limitations to it that don't exist in X11?

Question

As far as I understand, DirectFB offers hardware acceleration for many kinds of graphics cards. Additionally, it\'s smaller, faster, and uses up less memory than X11. Why then,

Answer 1

x11 is much more than just a way to draw to a screen - it's an entire network-capable desktop protocol suite. DirectFB does not intend to replace x11 (as far as I know) but rather runs parallel to it. That is, DirectFB strives to be a lightweight "host" for applications needing access to basic input and graphic output. It is possible that an X server (the server in X is the thing that displays things :-) is written to use DirectFB.

GTK on DirectFB is different than GTK on X11