Bug 342053

Summary:	Allow 512px thumbnail sizes
Product:	[Frameworks and Libraries] kio-extras	Reporter:	Martin Steigerwald <Martin>
Component:	Thumbnails and previews	Assignee:	David Faure <faure>
Status:	RESOLVED FIXED
Severity:	wishlist	CC:	fest.in, kdelibs-bugs, nate
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:	https://invent.kde.org/network/kio-extras/commit/87f12f936e053708ace0adc8b2bd8fc1c9bd38a2	Version Fixed In:	21.08

Description Martin Steigerwald 2014-12-20 17:31:16 UTC

I can only zoom thumbnails to 256x256 pixels. I would like to have bigger thumbnails on ThinkPad T520 15 inch Full HD display (1920x1080) as 256x256 is too small to preview image nicely for sorting them into folders.

Reproducible: Always

Steps to Reproduce:
1. Raise zoom slider to maximum


Actual Results:  
256x256 preview size maximum

Expected Results:  
Larger previews :)

Comment 1 Christoph Feck 2014-12-20 19:42:11 UTC

Thumbnails currently use the xdg thumbnails standard, which only supports 128 and 256 pixel sizes.

Comment 2 Fest 2015-02-28 21:34:31 UTC

This is another "High-dpi issue".

On 4k monitor thumbnails size is really too small to see even if set 256px.

Comment 3 Nate Graham 2018-04-13 22:03:11 UTC

The 256px thumbnails should scale appropriately if you're using HiDPI. Still it would be nice to see even larger thumbnails once the XDG spec supports it.

Comment 4 Bug Janitor Service 2020-12-18 06:28:33 UTC

A possibly relevant merge request was started @ https://invent.kde.org/network/kio-extras/-/merge_requests/62

Comment 5 Méven Car 2021-07-10 04:11:59 UTC

Git commit 87f12f936e053708ace0adc8b2bd8fc1c9bd38a2 by Méven Car.
Committed on 10/07/2021 at 04:11.
Pushed by meven into branch 'master'.

Thumbnails: Make thumbnail generation devicePixelRatio aware

Use the metadata devicePixelRatio to scale up dimensions of thumbnails generated.
Sets the devicePixelRatio on the output QPixmap according to the thumbnail generated.
Make the Text Thumbnail creator devicePixelRatio aware.
Follows xdg thumbnail specs 0.9 https://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html
FIXED-IN: 21.08

M  +14   -13   thumbnail/textcreator.cpp
M  +3    -3    thumbnail/textcreator.h
M  +1    -0    thumbnail/textthumbnail.desktop
M  +3    -0    thumbnail/thumbcreator.desktop
M  +87   -35   thumbnail/thumbnail.cpp
M  +3    -1    thumbnail/thumbnail.h

https://invent.kde.org/network/kio-extras/commit/87f12f936e053708ace0adc8b2bd8fc1c9bd38a2