[winswitch] Weird problem with display going transparent?

Antoine Martin antoine at nagafix.co.uk
Sun Sep 16 04:35:33 BST 2018

On 16/09/2018 07:13, Perry E. Metzger via shifter-users wrote:
> I'm on MacOS 10.13.6. At times, xprm
Do you mean xpra?

> windows I'm using become
> partially or fully transparent for no obvious reason. (Partially =
> portions of the window become transparent, not that the window
> becomes semi-transparent.)
Does this affect all windows or only the ones from specific applications?

You can try running the client with "--debug metadata".
The log output should tell us if the window is meant to be using
transparency to begin with. (ie: window opacity or alpha channel)

> This clearly is a bug of some sort. Any idea what might be triggering
> it or what workarounds might be?
run your client or server with:
XPRA_ALPHA=0 xpra ...
This is a big hammer which will disable transparency completely for all
windows. (not ideal but acceptable as a workaround)
Since only part of the windows are transparent, this could also be
caused by one of the picture encoders wrongly setting the alpha channel
- you should be able to confirm that by changing the picture encodings.
(ie run with: --encodings=rgb,png)
Otherwise, the bug may be triggered by the client rendering backend, try
turning OpenGL on or off.


> Perry

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