[maemo-developers] [maemo-developers] Improving Cairo performance on the N800
From: Daniel Amelang daniel.amelang at gmail.comDate: Tue Jan 16 07:48:35 EET 2007
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(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. 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. - 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. - 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? Dan Amelang
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