[maemo-developers] Wishlist (was:Re: N800 and USB host mode)

[From: Daniel Amelang]

On 3/8/07, Eero Tamminen <eero.tamminen at nokia.com> wrote:
> Hi,
>
> ext Kalle Vahlman wrote:
> > I haven't confirmed this, but according to the (non-exhaustive)
> > benchmarking currently it probably should be faster to work with image
> > surface in Cairo and only push the result to X, since it is
> > accelerated in neither.
>
> It might not be faster[1], but at least rest of the system (using X
> server) remains more responsive while a single client uses CPU instead
> of server used by all the applications being busy.

This is interesting. I hadn't thought about keeping heavy calculations
up at the client level in order to keep the X server responsive. Even
though it goes against the whole point of the X Render architecture,
it does make sense for a single-threaded X server. Have to think about
that some more...

> [1] There's a bug in Cairo bugzilla about slowness on 16-bit display
>      when using Render though...
>

Although the compositing code could still be better optimized for
16-bit displays, the real "bug" there was that they were recompositing
large surfaces at each scroll step, which will probably never be fast
unless compositing is hardware accelerated.

Dan