[Mesa-dev] [Bug 103699] Latest mesa breaks firefox on kde plasma with compositing on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103699

--- Comment #23 from Fredrik Höglund <fredrik at kde.org> ---
(In reply to Tapani Pälli from comment #22)
> (In reply to Fredrik Höglund from comment #20)
> > Created attachment 135782 [details]
> > modified test case
> >
> > The window decoration is a separate texture in kwin, so the decoration
> > should be rendered normally even if the fbconfig is causing a blending issue
> > with the window contents. I think it is more likely that binding the pixmap
> > to a texture failed, and kwin is skipping the window entirely as a result.
> >
>
> It is possible that there are 2 separate issues. One is the rendering
> results of krunner, panel and launcher menu, that is way too dark and then
> there are these invisible windows. Both get fixed by not setting sRGB
> capable config for 32bit visual, which I think is correct thing todo since
> there is only 1 such (non-conformant) visual exposed.

Yes, I believe the dark windows is a result of Qt not using the ARGB visual for
those windows, so the background which is supposed to be translucent is solid
black.

I don't disagree with the solution, but I don't think these are blending
issues; it's rather that applications are looking for a non-sRGB capable
fbconfig associated with the ARGB visual, and either giving up or falling back
to a non-ARGB visual after not finding one.

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