Use-case for CTRC background color?

[Ucan, Emre (ADITG/ESB)]

Hi Harish,

Then, this would only work for desktop-shell. Furthermore, I cannot set different background colors to different outputs.

Also my suggestion is simpler to implement.

Best regards

Emre Ucan
Engineering Software Base (ADITG/ESB)

Tel. +49 5121 49 6937

> -----Original Message-----
> From: Harish Krupo <harish.krupo.kps at intel.com>
> Sent: Freitag, 16. November 2018 09:39
> To: Ucan, Emre (ADITG/ESB) <eucan at de.adit-jv.com>
> Cc: wayland-devel at lists.freedesktop.org; pekka.paalanen at collabora.co.uk;
> daniels at collabora.com
> Subject: Re: Use-case for CTRC background color?
> 
> Hi Emre,
> 
> Thanks for replying.
> 
> Ucan, Emre (ADITG/ESB) <eucan at de.adit-jv.com> writes:
> 
> > Hi,
> >
> > Clients should not control a property of a wl_output directly.
> >
> > You can add a new property to the weston-config for output section, so
> that weston can enable a specific color for an output at startup.
> 
> Sorry, I should have been specific. The user would set the color here
> [1]. The desktop client would then check if the output (output wrapper)
> has advertised the background color capability. If so, it would then set
> the color using a different request as compared the the set_background
> request which already exists in weston-desktop-shell. This interface
> would take R, G, B colors instead of a buffer.
> 
> Thank you
> Regards
> Harish Krupo
> 
> [1]
> https://gitlab.freedesktop.org/wayland/weston/blob/master/weston.ini.in#
> L10
> 
> >> -----Original Message-----
> >> From: wayland-devel <wayland-devel-bounces at lists.freedesktop.org>
> On
> >> Behalf Of Harish Krupo
> >> Sent: Freitag, 16. November 2018 04:57
> >> To: wayland-devel at lists.freedesktop.org
> >> Cc: pekka.paalanen at collabora.co.uk; daniels at collabora.com
> >> Subject: Use-case for CTRC background color?
> >>
> >> Hi,
> >>
> >> This patch [1] introduces the background crtc color property. This
> >> property is available on some display controlers and allows setting a
> >> non-black colors for pixels not covered by any plane (or pixels covered
> >> by the transparent regions of higher planes). I would like to implement
> >> a userspace consumer of this propery in weston.
> >> The primary use case for this property is for compositors to set the
> >> background color. I am planning on implementing it as follows:
> >> * The desktop client would bind to the weston-desktop-shell protocol.
> >> * The weston-desktop-shell would have a wrapper for the wl_output
> >> object.
> >> * The client would create a wrapper for wl_output (maybe called
> >> weston_desktop_shell_output).
> >> * This output interface will have an event to advertise its capability
> >> to set the background color directly.
> >> * Once the capability is found and if the client wishes to set the
> >> background color, it would use the set_background_color request in the
> >> weston_desktop_shell_ouput interface to set the color by providing the
> >> r,g,b primaries.
> >>
> >> I have not completely thought this through, so I am sure this is
> >> incomplete and will require modification. I would like to know your
> >> comments and suggestions on the above method (or even if we could use
> >> this property differently) before I begin the implementation.
> >>
> >> Thank you
> >> Regards
> >> Harish Krupo
> >>
> >> [1] https://patchwork.freedesktop.org/series/50834/
> >> _______________________________________________
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