FRAMEBUFFER policy

FRAMEBUFFER policy

[Ian Molton]

Hi.

What is the policy as regards linux framebuffer drivers when presented
with a mode they cannot handle.

eg, suppose a driver can only handle even numbers of pixels and a
request is made for a mode with 639 pixels - should it allocate a 640
pixel wide mode?

or should it extend the height of a mode to allow hardware scrolling in
multiples of the font height?

Thanks.

-- 
Spyros lair: http://www.mnementh.co.uk/   ||||   Maintainer: arm26 linux

Do not meddle in the affairs of Dragons, for you are tasty and good with
ketchup.

Re: FRAMEBUFFER policy

[Geert Uytterhoeven]

On Mon, 16 Jun 2003, Ian Molton wrote:
> What is the policy as regards linux framebuffer drivers when presented
> with a mode they cannot handle.
> 
> eg, suppose a driver can only handle even numbers of pixels and a
> request is made for a mode with 639 pixels - should it allocate a 640
> pixel wide mode?
> 
> or should it extend the height of a mode to allow hardware scrolling in
> multiples of the font height?

If you pass a mode that cannot be handled, the driver must try to round up some
values to make it work. If that's not possible, an error is returned.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

Re: FRAMEBUFFER policy

[Ian Molton]

On Mon, 16 Jun 2003 14:12:45 +0200 (MEST)
Geert Uytterhoeven <geert@linux-m68k.org> wrote:

> 
> If you pass a mode that cannot be handled, the driver must try to
> round up some values to make it work. If that's not possible, an error
> is returned.

Great, thanks.

-- 
Spyros lair: http://www.mnementh.co.uk/   ||||   Maintainer: arm26 linux

Do not meddle in the affairs of Dragons, for you are tasty and good with
ketchup.