[dolphin] [Bug 447571] Flexible or larger thumbnail size AND per folder view settings

[Méven]

https://bugs.kde.org/show_bug.cgi?id=447571

Méven <meven at kde.org> changed:

           What    |Removed                     |Added
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                 CC|                            |meven at kde.org

--- Comment #5 from Méven <meven at kde.org> ---
Btw Dolphin can do 512 pixels resolution images when using an higher dpi than 1
to compensate.

This is a bit of a pickle.

I did this:
http://gitlab.freedesktop.org/xdg/xdg-specs/-/merge_requests/40 and
https://invent.kde.org/frameworks/kio/-/merge_requests/266
To achieve the aforementioned better support for Hidpi.

This starts to add a lot of disk usage if we were to keep using thumbnails.
Then a workaround would be to not cache the thumbnail when using 512x512
resolution but read it each time from files, which would remove the advantage
of caching thumbnails for snappy file browsing.
At the same time minimizing say a photo to 512 or 1024 is not harder on the CPU
than to compute for 256, only in memory usage.
This could be acceptable, but users would feel it, a bit like when you browse a
folder whose thumbnails haven't been computed yet, except all the time
depending on the zoom level.

Do you think that would be reasonable ?
I would consider have an opt-in option to allow to generate 512x512 preview (in
logical pixel that is 1024x1024 for dpi>1).

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