https://bugs.kde.org/show_bug.cgi?id=440169
Bug ID: 440169
Summary: Painting with brushes on canvas slow and unresponsive
compared to scratchpad in brush settings
Product: krita
Version: 4.4.5
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: major
Priority: NOR
Component: Brush Engine/Bristle
Assignee: krita-bugs-n...@kde.org
Reporter: michal.star...@gmail.com
Target Milestone: ---
Created attachment 140267
--> https://bugs.kde.org/attachment.cgi?id=140267&action=edit
Krita v4.4.5, canvas vs scratchpad (comparison of quickly drawed rounded
shapes)
SUMMARY
Painting on canvas is slow and unresponsive compared to painting on scratchpad
in brush settings.
STEPS TO REPRODUCE
1. Create simplest possible harx 1px brush (disable all the flow etc. settings)
2. Try very quickly drawing a few rounded shapes
3. Enter brush setting and very quickly drawing similar shape on the
scratchpad.
OBSERVED RESULT
1. Drawing on the scratchbad works as it should: fluid, very responsive, shapes
are properly rounded exactly as mouse was moved - comparable experience to
commercial products like Clip Paint Studio. Feels like 500 Hz, comparable to
mouse input events rate.
2. Drawing on the canvas is absolutely painful. Sluggish, shapes are more
square than round, doesn't feel responsive at all. Feels like 30 Hz.
I am attaching screenshot illustrating difference in the results.
EXPECTED RESULT
Drawing on the canvas working similarily smooth to drawing on the scratchpad in
brush settings.
Without that whole drawing experience is just ruined - like half information
from mouse is lost, rounded shapes are turned into squares, etc.
SOFTWARE/OS VERSIONS
Windows: Windows 10 Pro 64-bit 21H1 (19043.1110)
macOS:
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version:
KDE Frameworks Version:
Qt Version:
ADDITIONAL INFORMATION
CPU: i5-6600K
GPU: GTX 960 (driver 471.11)
RAM: 16 GB
I've tried both Direct3D and OpenGL modes - same results.
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