[Breeze] [Bug 369676] White lockscreen text's readability depends on background

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=369676

--- Comment #24 from Martin Flöser <mgraesslin at kde.org> ---
I really like the idea presented by Marco to use a slideshow and then
transition to our "existing" lock screen. I see this as a clear evolution over
the current state without losing why we did the current existing lock screen in
the first place.

What I would like to be considered is the impact on the environment when doing
a slideshow. If a system is locked, it's most likely because nobody is in front
of the system. That means we show an animation nobody sees, which of course has
a negative impact on the climate. We shouldn't downplay this factor as this
change will hopefully affect millions of systems.

But I think it's possible to get a compromise here:
 * stop the animation as soon as the screen goes into power saving (for this we
might need a hook from powerdevil) and restart on user interaction
 * increase the time between every transition (e.g. fibonacci style, so the
longer nobody interacting with the system, the longer it takes for an animation
to be shown).

For those wondering why an animation is a big deal: in the locked case we have
KWin (Wayland compositor) pretty much sleeping, the system can go into the
lowest power mode. But animations mean that the compositor is woken up and the
system needs to go into a higher power state. The transition between wallpapers
is animated so our system is at least woken up 60 times per second for the
duration of the transition.

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