Re: Opinions about YUV framebuffers

On Sun, 7 Aug 2005, Nishant Kamat wrote:

I'd like to solicit some opinions about using the fbdev API for a
display controller that accepts data in YUV format. fbcon seems to be

Just add an additional #define FB_VISUAL_* for your YUV format to <linux/fb.h>.
Been there, done that.

written to work only for RGB framebuffers. Is that correct? Would it

In 2.6, if you provide an fb_imageblit() routine that converts from 256 color
CLUT to YUV, you should have a text console and a penguin.

In 2.4, getting a text console (and penguin) on YUV is much more work.

require lot of change to make it work with YUV data? Can X be run on
YUV framebuffers?

I'm afraid X doesn't support YUV yet.

But if you use the shadow buffer feature in recent X code, you can run the X
server in e.g. RGB565 or RGB888, and write an update routine to convert a
rectangular area from RGB565 resp. RGB888 to YUV. After that you'll have X
running.

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


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