Re: [PATCH] pxafb: Add support for other palette formats

["Hans-Jürgen Koch" <hjk@linutronix.de>]

Am Dienstag 03 Juli 2007 19:21 schrieb Paulo Marques:
> Hans-Jürgen Koch wrote:
> > Am Dienstag 03 Juli 2007 18:03 schrieb Paulo Marques:
> >> [...]
> >> Or maybe teach fbcon to use 18bpp modes?
> > 
> > This would only make sense if this is a common format that other
> > chips use, too.
> 
> I don't see this as a good reason not to implement 18bpp support in 
> fbcon. "Just PXA270 18bpp devices" can be a lot of devices out there.

I guess most hardware developers will connect their LCD with only
16-bit, use RGB565, and are happy with that. It's a pity that this
requires a physically different wiring of the LCD.

> 
> Anyway, can fbcon work with 18bpp palette mode? If it does, then this 
> should be enough for most users of 18bpp pxafb users: have a console 
> with a palette mode and then switch to non-palette mode and run whatever 
> windowing system supports 18bpp.

I need to run gtk-directfb, and I'd be surprised if libcairo could handle
that...

> 
> I guess that even if it doesn't support 18bpp palette mode now, it 
> shouldn't be that hard to implement (nor should it cause that much bloat 
> to fbcon).

fbcon is not the big problem. But there's a lot of userspace stuff out there
where they create graphics in their own buffers and blit it into the 
framebuffer when ready. Most of them are definitely not prepared to support
this format.

Thanks,
Hans


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