https://bugs.kde.org/show_bug.cgi?id=452528
Bug ID: 452528
Summary: Reference images cause low canvas FPS when taking up a
large part of the screen.
Product: krita
Version: nightly build (please specify the git hash!)
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Tools/Reference Images
Assignee: krita-bugs-n...@kde.org
Reporter: i...@ralek.art
Target Milestone: ---
5.1.0-prealpha (git af77a5f) But I've noticed this as far back as 4
When having any sized reference image up, if you zoom too far in while the ref
is still on-screen, the FPS can drop as low as 10% of the normal canvas FPS
(220 down to 22).
To reproduce:
- Open a canvas
- paste or open a reference image of any size
- monitor canvas FPS when panning at various zoom levels on the ref image.
Things that affect the FPS directly:
- The relative resolution of the canvas docker on the screen (4k screens and
full-screen mode have it bad, less noticeable on 1080p screens.)
- The percentage of the screen taken up by the reference image. (This variable
can go over 100% if more than one reference image is overlaid on top of each
other, try placing 5 refs in the same place and make them take up the full
screen.
Things that DON'T seem to affect the FPS directly:
- Canvas zoom level
- Scale of the reference image
- resolution of the reference image (2000x2000 vs 10x10)
- Total number of refs (only percentage of screen taken up)
- Color mode or channels of ref images
- Whether they're referenced to a file or copied off clipboard
- Whether they're overlaid on or off the side of the canvas
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