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

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

Méven Car <[email protected]> changed:

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--- Comment #8 from Méven Car <[email protected]> ---
(In reply to Paul Guillaume from comment #7)
> (In reply to Nate Graham from comment #1)
> > 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.
> 
> Is this something that was changed? I used the Dolphin preview panel to
> successfully view the contents of PDF files without having to open them, to
> sort and rename the files. This worked perfectly until sometime in 2023,
> when I upgraded to Kubuntu 22.04. Since then, it has not worked properly.

I think the issue depends on the pdf file previewed:
Some pdf files can have thumbnail/pre-render inside the pdf.
And the image read by the information panel uses it, despite it requested a
bigger image.

To be clear I have several pdf that render "big" in the information panel.

I could confirm, if I had such a pdf, then we can use the cached image when its
size its sufficient or generate a full page output otherwise.

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