[dolphin] [Bug 435226] File preview limited in size

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=435226

--- Comment #1 from Nate Graham <nate at kde.org> ---
It looks like the preview that's shown here is simply the thumbnail that's
already been generated, to save resources. This thumbnail is a maximum of
256x256, which is according to the FreeDesktop.org thumbnail spec.

So one of two things would have to happen here:

1. The FDO spec permits the generation of larger thumbnails, and then this
preview could consume those larger previews
2. The preview widget generates the previous dynamically, rather than re-using
the existing thumbnails

The downsides to option 1 are bureaucracy and the possibility that it wouldn't
work at all; even a 512x512 thumbnail isn't that big at 200% scale, and a
1024x1024 thumbnail can't really be considered a thumbnail anymore, so it would
probably not be accepted.

The downsides to option 2 are increased resource consumption and reduced speed
by re-doing already-done work by reading the file data ourselves rather than
relying on an already-generated thumbnail image.

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