Hi Geert,
On Monday 29 August 2011 15:09:04 Geert Uytterhoeven wrote:
> On Mon, Aug 29, 2011 at 14:55, Laurent Pinchart wrote:
> >> When will the driver report FB_{TYPE,VISUAL}_FOURCC?
> >> - When using a mode that cannot be represented in the legacy way,
> >
> > Definitely.
> >
> >> - But what with modes that can be represented? Legacy software cannot
> >> handle FB_{TYPE,VISUAL}_FOURCC.
> >
> > My idea was to use FB_{TYPE,VISUAL}_FOURCC only when the mode is
> > configured using the FOURCC API. If FBIOPUT_VSCREENINFO is called with a
> > non-FOURCC format, the driver will report non-FOURCC types and visuals.
>
> Hmm, two use cases:
> - The video mode is configured using a FOURCC-aware tool ("fbset on
> steroids").
Such as http://git.ideasonboard.org/?p=fbdev-test.git;a=summary :-)
> Later the user runs a legacy application.
> => Do not retain FOURCC across opening of /dev/fb*.
I know about that problem, but it's not that easy to work around. We have no
per-open fixed and variable screen info, and FB devices can be opened by
multiple applications at the same time.
> - Is there an easy way to force FOURCC reporting, so new apps don't have
> to support parsing the legacy formats? This is useful for new apps that
> want to support (a subset of) FOURCC modes only.
Not at the moment.
--
Regards,
Laurent Pinchart
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