[mythtv] Ticket #4220: Odd OSD scaling - not using full display resolution

[Roo]

On 05/02/2008, MythTV <mythtv at cvs.mythtv.org> wrote:
> #4220: Odd OSD scaling - not using full display resolution
> --------------------------------------+-------------------------------------
>  Reporter:  Roo <roo.watt at gmail.com>  |        Owner:  ijr
>      Type:  defect                    |       Status:  closed
>  Priority:  minor                     |    Milestone:  0.21
> Component:  mythtv                    |      Version:  head
>  Severity:  medium                    |   Resolution:  invalid
>   Mlocked:  0                         |
> --------------------------------------+-------------------------------------
> Changes (by danielk):
>
>   * status:  new => closed
>   * resolution:  => invalid
>
>
> Comment:
>
>  Feature request without patch.

Fair enough, I know the ticket has been open a while without a patch.;-)

However I do think this is a defect (maybe a dupe) as I can reproduce
the squashed font issue as listed in other tickets when using these
non-scaling renderers.
I could be wrong (quiet likely) but I think the issue is the OSD is
not being scaled yet the font scaling metrics are calculated as if it
were.

I would like to fix this for 0.21 as I hope it might kill a few other
issues at the same time. I have looked into the source and have a
*basic* understanding of the videoutbase class, any advice on the
right way to fix this would be appreciated.

I assume using "video_output_subtype" to detect the relevant renderers
and then using sws_scale() from libswscale is correct. Where in the
video processing chain is the "right" place to put the swscaling if it
is needed?

Any pointers from experienced developers is appreciated.

Cheers,

Roo.


PS: I am at work, so most of this is from memory (which can be hazy sometimes).