> With any kind of GPU acceleration it will actually make things much slower. GTK doesn't do this because it would only be useful for that kind of machine running around 25 years ago.
Precisely one of the points of TFA is be able to use the "25 year old" hardware overlay support whenever possible (instead of the GPU) in order to save power, like Android (and classic Xv) does.
1. The hardware overlay support is implemented on the GPU. It's not "instead of the GPU".
2. The provided code in Haiku doesn't appear to support overlays.
3. Yes, it's upsetting that a real API wasn't available for this until recently. But, it was of limited practical use without the entire display pipeline being moved to the GPU and without Wayland being established (X11 never had the API quite like this, classic XV is too limited to do what this is doing)
Precisely one of the points of TFA is be able to use the "25 year old" hardware overlay support whenever possible (instead of the GPU) in order to save power, like Android (and classic Xv) does.