[mythtv] XVMC Change Feedback --Revision 7519

[Daniel Kristjansson]

On Fri, 2005-10-21 at 22:23 -0400, Andy Poling wrote:
> implemented it because I only have to do the conversion when the OSD content
> changes (when surface->Changed() is true).  That doesn't actually happen very
> often, so the expense of the yuv-to-rgb conversion is amortized over time, and
> the separate thread lets the system scheduler allocate cpu time to it
> piecemeal as it's available.
This isn't really true anymore, if you are using a DTV card, the 
signal monitoring OSD is updated at a higher rate than OSD redraws.

I'm thinking of just implementing this myself, so don't put too
much work into this unless you think you can make it seamless.

-- Daniel