https://bugs.kde.org/show_bug.cgi?id=366024
Bug ID: 366024
Summary: Issues with successive strokes in instant preview when
at less than 100% zoom.
Product: krita
Version: 3.0
Platform: Archlinux Packages
OS: Linux
Status: UNCONFIRMED
Severity: major
Priority: NOR
Component: Instant Preview
Assignee: krita-bugs-n...@kde.org
Reporter: rabc...@hotmail.com
This is a pretty major issue with instant preview since it basically means I
cannot do thumbnailing or work in a zoomed out setting both of which are kinda
crucial to working at high resolutions.
I have a Yiynova MVP22U+(RH) on digimend V6 configured with evdev on arch linux
with KDE; the issue may only affect certain tablet brands, I don't know (I
think this didn't happen on my old wacom)
What happens basically is that the first stroke I draw while zoomed out always
goes well, but if I start doing another stroke within like a second after the
first one ends, I can encounter bugs like the stroke going on a different
trajectory or starting in a different spot than my cursor was, and also
sometimes the stroke will not show immediately, then when it does show (after I
raise my pen) maybe only a part of the stroke was completed. Basically all
sorts of mess can happen between strokes in instant preview whilst zoomed out,
the issue strangely enough didn't occur when at 100% or closer zoom. The issue
becomes worse the further I zoom out and less noticable at a closer zoom (Like
120% seems to work pretty ok)
I'm working at a pretty high resolution (8K) on a 1920x1080 monitor, so the
particularly high resolution and how far I need to zoom out (like 13% zoom
sometimes) may have a major impact on this.
Reproducible: Always
Steps to Reproduce:
1. Make a new image at 8192x8192 resolution, zoom out to fit screen
(assumed:1920x1080) and select a brush, make sure instant preview is enabled.
2. Draw quick successive strokes (I recommend rapid handwriting)
3. Watch everything go wrong! (Only the first letter/stroke looks right! :( )
Actual Results:
Misaligned and disproportionate and often misshapen strokes
Expected Results:
Strokes aligned with the cursor/pen and proportional to the distance the
pen/cursor actually travelled.
I confirmed that disabling instant preview indeed fixes the problem.
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