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List:       kde-bugs-dist
Subject:    [kwin] [Bug 343877] The shadow of stacked windows should be like the shadow of a single window
From:       Thomas Lübking <thomas.luebking () gmail ! com>
Date:       2015-02-07 14:31:19
Message-ID: bug-343877-17878-9NaA8gD6cs () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=343877

Thomas Lübking <thomas.luebking@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|effects-various             |compositing
           Severity|normal                      |wishlist

--- Comment #3 from Thomas Lübking <thomas.luebking@gmail.com> ---
> A realistic shadow effect should not be affected by the number of stacked window.

KWin has nowhere a realistic shadow model - there's no lighting concept like in
eg. a game (and you would probably not like that either)
The shadows are just some translucent parts of the window (decoration)

Leaving your trivial case aside, this cannot be resolved in a reasonable way,
eg. depending on the implied light model, the shadows between two windows would
either have to overlay (strengthen each other) or there must not be any shadow
at all (because of the central light)

I won't say "come up with a patch", but you'd have to provide a complete and
self-consistent concept for shadows that you'd prefer (and I postulate that you
will not prefer a realistic light model, also because very few light setups
would generate the type of present shadows. Try to cast such a soft fading
shadow at home ;-)

Ftr:
-----
a stack of windows would indeed reduce the amount of ambient light (reflections
from the window backsides), so to a certain degree (a black window hardly
reflects light) the present behavior is actually justifiable.

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