<div dir="ltr">Hi Pekka,<div>Thank you for reply!. We would like to understand the behavior of weston in following use cases</div><div><br></div><div> <font size="4"> Scenario 1</font>: What is the Alpha value on weston composed output buffer in following use case</div><div> Screen has only one surface and which has alpha '0'</div><div><br></div><div><div><img src="cid:ii_k6g5la670" alt="image.png" width="349" height="172" style="margin-right: 0px;"><br></div></div><div><br></div><div><br></div><div> <font size="4"> Scenario 2: </font> Screen has only one surface and which has alpha '255'
</div><div><div><img src="cid:ii_k6g5nunb1" alt="image.png" width="394" height="193"><br></div></div><div> <font size="4">Scenario 3:
</font>
Screen has two surfaces which has alpha given below </div><div><br></div><div><div><img src="cid:ii_k6g5pwuq2" alt="image.png" width="425" height="245" style="margin-right: 0px;"> ..<br></div></div><div><br></div><div>Thanks a lot for your support.</div><div><br></div><div>Thanks,</div><div>Ravi Sankar Namburi</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Feb 5, 2020 at 2:32 PM Pekka Paalanen <<a href="mailto:ppaalanen@gmail.com">ppaalanen@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Wed, 5 Feb 2020 13:28:10 +0530<br>
Raghu Kadari <<a href="mailto:raghuram0099@gmail.com" target="_blank">raghuram0099@gmail.com</a>> wrote:<br>
<br>
> Hi Paalanen,<br>
> <br>
> Thanks for the reply ! would like to confirm below.<br>
> <br>
> How can I check the Alpha channel of the final output of the weston. Is<br>
> there way I can check this information from the console?<br>
<br>
Hi,<br>
<br>
if you happen to be using GL-renderer, there is something like this in<br>
the log:<br>
<br>
[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)<br>
<br>
However, that's only the renderer config. Even if it has an alpha<br>
channel, I think the DRM-backend will still substitute XRGB in the FB<br>
format since it knows the renderer produces an opaque image.<br>
<br>
Other than that, not in Weston I think.<br>
<br>
If you explained what you actually want to achieve, people might be<br>
able to offer you more helpful answers. Weston has been deliberately<br>
designed to produce an opaque image because we don't have see-through<br>
monitors.<br>
<br>
<br>
Thanks,<br>
pq<br>
</blockquote></div>