[maemo-developers] [maemo-developers] Fwd: [cairo] Improving Cairo performance on the N800
From: Xan Lopez xan.lopez at gmail.comDate: Tue Jan 16 09:08:12 EET 2007
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---------- Forwarded message ---------- From: Xan Lopez <xan.lopez at gmail.com> Date: Jan 16, 2007 9:01 AM Subject: Re: [cairo] Improving Cairo performance on the N800 To: Daniel Amelang <daniel.amelang at gmail.com> Cc: maemo-developers at maemo.org, cairo at cairographics.org On 1/16/07, Daniel Amelang <daniel.amelang at gmail.com> wrote: > (Double posting here, apologies for any overlap) > > Now that Cairo on the 770 is performing pretty well, I hope the way is > cleared for Maemo to switch over to Cairo (and a more recent GTK). > Several of us have put a lot of effort into speeding it up, so it > would be nice to see the fruits of our labors on the Nokia devices. If > there are any more outstanding performance issues, let us know on the > Cairo list. FYI, Carl has projected that Cairo 1.4 (the first stable > release with the new optimizations) will be out in the next month or > so. Thanks to everyone's effort the issues of Cairo and a more recent GTK in maemo are no longer a question of "if" but "when". Thanks for your contribution :) > > Now, the recently announced Nokia N800 is different from the 770 in > various ways that are interesting for Cairo performance. I've got my > eye on the ARMv6 SIMD instructions and the PowerVR MBX accelerator. > > In other news, I'm looking for a class project for an embedded > software course I'm taking, so I'm thinking I can kill two birds with > one stone if I can turn some Cairo on OMAP 2420 optimizations into > something my professor will give me a grade for. So, I'm looking for > some feedback on the following ideas: > > - Write some ARMv6 SIMD assembly for Cairo's image backend (pixman). > If this turns out to be feasible and advantageous, the resulting code > could also be incorporated into the fb part of the X server. > Someone wrote to the maemo list very recently suggesting, among others, the very same thing: http://maemo.org/pipermail/maemo-developers/2007-January/007113.html > - Write a new Cairo backend that targets OpenVG, since the PowerVR MBX > has fully-accelerated OpenVG rendering. I haven't found anything about > OpenVG + Maemo 3.0, so maybe the software infrastructure isn't there > yet to do this. > I really don't know if the n800 supports this, buf after googling around a bit I certainly hope it does. Surely we'll get a reply from someone in the know. > - Something involving the OpenGL capabilities of the MBX. It doesn't > support shaders, so it would be pretty limited. It does support > multitexturing, so maybe a poor man's glitz is feasible. > > Any ideas? > The color cache for cairo is still unimplemented! (I know, probably I should try to do it, serves me right for spamming the list with xtrace mails ;) I started a little cairo project targeted for the device a couple of days ago. If I'm not very misguided it will perfom so poorly that it'll keep us busy for the rest of the year. If/When I have a something at least prototype-quality I'll send it to the list. Cheers, Xan > Dan Amelang > _______________________________________________ > cairo mailing list > cairo at cairographics.org > http://cairographics.org/cgi-bin/mailman/listinfo/cairo >
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