[sldev] OpenJPEG Optimizations

Francois-Olivier Devaux fodprolux at gmail.com
Fri Feb 9 05:11:42 PST 2007

Ok, the coordination will be done through the
https://wiki.secondlife.com/wiki/Openjpeg_improvements page.


On 2/8/07, Jason Giglio <gigstaggart at gmail.com> wrote:
> Thank you for your reply regarding OpenJPEG licensing.
> I do not have the skill currently to help much improving OpenJPEG
> efficiency, but I have gathered up all the information I could find on
> it.  Here is what I have come up with:
> https://wiki.secondlife.com/wiki/Openjpeg_improvements
> Bushing's profiling shows that the DWT, particularly the 9/7 is where
> the bottleneck is for SL.
> Improvements:
> Use in-place DWT.
> Use lifting implementations rather than the current implementation.
> Use SSE/MMX to get a speed increase.
> I have found several lifting implementations of 5/3 and 9/7, but it
> seems that all of them are floating point rather than integer.  I don't
> know how useful they would be.
> Please coordinate with the SL developers on that wiki page or here on
> the mailing list.  If you could forward this to anyone who has contacted
> you so that we can all work together that would be best.
> Thanks.
> -Jason
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