Output Frame of Weston

[ravi shankar]

Hi Pekka,
Thank you for reply!. We would like to understand the behavior of weston in
following use cases

      Scenario 1: What is the Alpha value on weston composed output buffer
in following use case
                   Screen has only one surface and which has alpha '0'

[image: image.png]


       Scenario 2:    Screen has only one surface and which has alpha '255'
[image: image.png]
     Scenario 3: Screen has two surfaces which has alpha given below

[image: image.png]      ..

Thanks a lot for your support.

Thanks,
Ravi Sankar Namburi


On Wed, Feb 5, 2020 at 2:32 PM Pekka Paalanen <ppaalanen at gmail.com> wrote:

> On Wed, 5 Feb 2020 13:28:10 +0530
> Raghu Kadari <raghuram0099 at gmail.com> wrote:
>
> > Hi Paalanen,
> >
> > Thanks for the reply !  would like to confirm below.
> >
> > How  can I check the Alpha channel  of the final output of the  weston.
> Is
> > there way I can check this information from the console?
>
> Hi,
>
> if you happen to be using GL-renderer, there is something like this in
> the log:
>
> [12:41:04.152] Chosen EGL config details: id:   6 rgba: 8 8 8 0 buf: 24
> dep:  0 stcl: 0 int: 1-1 type: win vis_id: XRGB8888 (0x34325258)
>
> However, that's only the renderer config. Even if it has an alpha
> channel, I think the DRM-backend will still substitute XRGB in the FB
> format since it knows the renderer produces an opaque image.
>
> Other than that, not in Weston I think.
>
> If you explained what you actually want to achieve, people might be
> able to offer you more helpful answers. Weston has been deliberately
> designed to produce an opaque image because we don't have see-through
> monitors.
>
>
> Thanks,
> pq
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/wayland-devel/attachments/20200210/343ca9af/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 15726 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/wayland-devel/attachments/20200210/343ca9af/attachment-0003.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 17064 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/wayland-devel/attachments/20200210/343ca9af/attachment-0004.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 26706 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/wayland-devel/attachments/20200210/343ca9af/attachment-0005.png>