https://bugs.kde.org/show_bug.cgi?id=436731
Bug ID: 436731
Summary: Huge brush tip images unnecessarily slow down Krita on
every start of the stroke
Product: krita
Version: git master (please specify the git hash!)
Platform: Mint (Ubuntu based)
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: tamtamy.tym...@gmail.com
Target Milestone: ---
SUMMARY
If you have the same brush (in Pixel Engine) with the same brush tips options
and the same size, and you only change whether it's a huge brush tip image -
for example 3.000x3.000, or a small brush tip image - 100x100, you'll see a big
difference in speed of starting the line.
Since the result size of the brush is the same in both cases, it shouldn't
cause much slowdown - maybe only a bit to scale down the brush tip, but it
shouldn't happen before every stroke.
I marked it as a bug since I can see there is some KisSharedQImagePyramid used
for brush tips so I believe it must not be intentional that Krita scales it
down every time the stroke starts.
Note that "every start of the stroke" does include strokes in the brush editor,
which makes the brush editor very laggy if you try to edit a brush preset like
this.
STEPS TO REPRODUCE
1. Have a Pixel Engine brush, preferably without Size dynamics.
2. Have two identical brush tips, just one should be 3.000x3.000, and the other
one scaled down to 100x100.
3. Try to paint with one brush tip, and then the other.
OBSERVED RESULT
Slowdown in the brush editor and at the beginning of every stroke on the
canvas.
EXPECTED RESULT
Slowdown, if necessary, only on the first stroke.
SOFTWARE/OS VERSIONS
Krita 3241355287
Krita
Version: 5.0.0-prealpha (git 3241355)
Languages: pl, pl_PL, pl
Hidpi: true
Qt
Version (compiled): 5.12.8
Version (loaded): 5.12.8
OS Information
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