Acceleration on the 770/N800 (was: Re: Acceleration of 2D operations for kdrive)

Daniel Stone daniel at
Sun Feb 4 07:39:25 PST 2007

On Sun, Feb 04, 2007 at 10:33:56AM -0500, Alex Deucher wrote:
> On 2/3/07, Daniel Stone <daniel at> wrote:
> >On Fri, Feb 02, 2007 at 02:04:42PM -0800, Keith Packard wrote:
> >> For short lines, software is almost always faster; the cost of setting
> >> up the line and synchronizing with the hardware swamps the benefit of
> >> using it. For long lines, you fill the screen fast enough that using the
> >> hardware doesn't make a huge difference. That's why I didn't bother
> >> adding hardware line hooks.
> >
> >(FWIW, this is the case on the Nokia 770 and N800.)
> Do the 770 or the N800 have an sort of accelerated X server or is it
> just fbdev?  Just curious.

There's no hardware acceleration for the usual ops.  On the 770, video
colourspace conversion and scaling is done by the DSP; on the N800, we
do it on the GPU.  But that's it.

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