https://bugs.kde.org/show_bug.cgi?id=423944
Bug ID: 423944
Summary: wish: flicker-free changing between images
Product: gwenview
Version: 19.12.3
Platform: unspecified
OS: Unspecified
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: kdeb...@caseyconnor.org
Target Milestone: ---
When browsing a directory of images, on every image switch gwenview currently
(19.12.3) blacks out the screen, shows a loading icon in the middle of the
frame, and then displays the image (presumably because it is loading, preparing
to draw, etc.)
It would be great if gwenview could wait to make any changes on the screen
until the image is ready to be displayed and then instantaneously update the
image. (Apparently this was fixed in 18.08, but was changed back to its current
state at some point; see bug #403162)
There doesn't seem to be any UX value to changing the screen to black while the
image loads. For viewing directories of images that are, e.g. frames in an
animation or time lapse, it's nice to be able to smoothly see the difference
between two images without a disturbing visual interruption when switching.
Flicker-free changing also generally improves the feel of browsing unrelated
images. (I doubt there is really a medical argument re: seizures, but it might
be relevant to someone that wants to scroll through many bright images?)
When/if this change is made, the loading icon should also be moved from the
image frame and on to the toolbar, for the same reason: best to avoid
disturbing visual changes to the image frame whenever possible. (Having the
loading icon remain in the image frame would somewhat defeat the point of
removing the black flicker, IMO.)
I will file a separate bug for pre-bufferring of images to make switching
faster.
Thanks for considering it!
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