https://bugs.kde.org/show_bug.cgi?id=395725

--- Comment #69 from doncb...@gmail.com ---
(In reply to folderkillered from comment #68)
> (In reply to Michail Vourlakos from comment #67)
> > work on this: https://invent.kde.org/plasma/kwin/-/merge_requests/1961
> 
> What if blur happens only under pixels which have an alpha value? I am no
> programmer, but I think this should be possible.

In Aurorae themes, there is no separation of window and shadow. Both SVG
elements are part of the same frame. In my attached screenshot, the left shows
a theme. There are details present with varying opacities, so going by alpha
would blur the shadow and outlines as well, regardless of whether a designer
wanted that or not.

Someone correct me if I'm wrong, but I think the blur effect does not support
alpha. In any plasma theme with low opacity, the 'pixel art' corners of the
plasmoids can be visible. The right side of the screenshot shows how the blur
mask is not anti-aliased. This problem was somewhat fixed when a bug in the
mask calculation was fixed, but certain corner shapes and radii can still make
it visible. Clever hiding by the designer is usually necessary to avoid seeing
the blur region bleed outside of a corner.

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