[mythtv] Patch for Via XvMC VLD QMatrix Decoding

Isaac Richards ijr at po.cwru.edu
Mon Sep 20 10:42:51 EDT 2004


On Monday 20 September 2004 10:22 am, Ivor Hewitt wrote:
> >>However, I was planning on creating a new OSDI44Surface type, to hold
> >>and handle the OSD in native format instead. I'll let you know if I get
> >>anywhere.
> >
> >That'll be even worse performance - the current blending code is MMX
> >optimized, and if you change the internal surface format, you'll lose
> > that.
>
> But there would be no blending required to display the final osd, it
> would be held in I44 format throughout.
> Of course, it might be a complete non-starter and I've probably
> overlooked something fundamental... I just thought I'd give it a bash.

You're overlooking the fact that all the images/text are blended into each 
other / the surface.  All of that has been MMX optimized for a YUV420 
internal surface format.

Isaac


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