[mythtv] Patch for 4:3 zoom on 16:9 broadcasts of 4:3

[Christian Hack]

From: Christian Hack
> From: Isaac Richards
> > > One problem is that the zoom causes part of the OSD to fall 
> > off the screen.
> > > Is there some way to scale the OSD back such that it 
> > remains independent of
> > > the zoom? I had a look at the OSD code but couldn't see 
> an easy way.
> > 
> > Probably will need to re-init the OSD class with the new 
> numbers.  In 
> > NuppelVideoPlayer.cpp, the ToggleLetterbox function, you 
> > should probably need 
> > to do something very similar to 
> > NuppelVideoPlayer::ReinitVideo(), but without 
> > the call to videoOutput->InputChanged() and ClearAfterSeek().
> > 
> 
> I had a look at this and essentially called osd->Reinit with
> appropriately calculated values for dispx, dispy, dispw and 
> disph. When
> I tried it though, all the osd got completely corrupted. I think I'm
> doing it right. I followed the Reinit into OSD::Reinit and then
> OSDSet::Reinit but they don't really seem to use the offset stuff -
> possibly explaining the problems. Should it be this simple? I had:
> 
> void NuppelVideoPlayer::ToggleLetterbox(void)
> {
>     if (videoOutput)
>         videoOutput->ToggleLetterbox();
> 
>     if (osd) 
>     {
>         int dispx = 0, dispy = 0, dispw = video_width, disph =
> video_height;
> 
>         videoOutput->GetDrawSize(dispx, dispy, dispw, disph);
> 
>         if (videoOutput->GetLetterbox() == 2) {
>             dispw = video_width * 9.0 / 16;
>             dispx = (video_width - dispw) / 2;
>         }
> 
>         osd->Reinit(video_width, video_height, frame_interval,
>                     dispx, dispy, dispw, disph);
>     }
> }
> 
> The final call was then for a 720x576 image:
> osd->Reinit(720, 576, frame_interval, 157, 0, 405, 576);
> 

Isaac - am I doing something stupid here? As far as I can tell, this
should be enough.

CH