Compositor for eink device

[Claudius Marpa Heine]

Am Dienstag, den 11.06.2013, 13:16 +0300 schrieb Pekka Paalanen:
> On Tue, 11 Jun 2013 10:56:49 +0100
> martin brook <martin.brook100 at googlemail.com> wrote:
> 
> > Guys Hi,
> > 
> > An interesting area which I've done some work on with a kobo touch, some
> > useful links at
> > 
> > https://wiki.merproject.org/wiki/Community_Workspace/kobo
> 
> Ok, only static pseudocolor, of course. Hopefully that matches PIXMAN_g8
> format and pixman does the conversion automatically and without too
> much hit.
> 
> The current pixman renderer in Weston is written for ARGB
> compositing of client provided images. It is wasteful to first
> composite in ARGB and then convert to grayscale, so if that needs
> optimizing, you may need to:
> - convert incoming buffers to grayscale and maintain a copy
> - modify the pixman renderer to composite in grayscale+alpha, if
>   possible
> - add a grayscale pixel format to wl_shm protocol (I have planned on
>   adding more formats anyway)
> - modifying clients to use the grayscale format
> 
> But I think it is possible to start with the pixman renderer as is, and
> convert to grayscale when copying to the fb.

Not sure if that helps, but someone successfully converted the content
of the framebuffer to RGB:
http://www.chauveau-central.net/pub/KoboTouch/

Regards
Claudius
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