| Summary: | Brush is smoother and less laggy with OpenGL turned off | ||
|---|---|---|---|
| Product: | [Applications] krita | Reporter: | Chris Jones <chrjs> |
| Component: | General | Assignee: | Krita Bugs <krita-bugs-null> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | CC: | dimula73, halla, osxyz |
| Priority: | NOR | Keywords: | regression |
| Version: | 3.0 Alpha | ||
| Target Milestone: | --- | ||
| Platform: | Microsoft Windows | ||
| OS: | Microsoft Windows | ||
| Latest Commit: | Version Fixed In: | ||
| Attachments: |
Stroke opacity glitches
Brush with spacing controlled by speed |
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Description
Chris Jones
2016-03-16 01:04:14 UTC
Hi Chris, What is the colorspace/channel depth of your image? And which preset are you using exactly? I've tried on my SP3, but both opengl and cpu canvas are smooth and curves come out perfectly curved (even on Linux, when running with a performance tuner like valgrind, the curves are perfectly smooth -- we're not skipping any events any more). Hi Boud, This is with RGB 8 or 16 bit using the default colour profile. Occasionally the problem is more pronounced with 16 bit (I haven't figured out why), so I'd suggest testing with 16 bit. It happens with any of the presets - Fill Circle is probably a good example. To clarify, the quality of the curve isn't affected as such, it's just the way the strokes appear to be laid down, as if the frame-rate is reduced. Incidentally, turning OpenGL on and off a few times (closing the preferences panel in-between) usually results in a crash. That sounds like an additional initialization problem :-( Created attachment 98464 [details]
Stroke opacity glitches
I've noticed now that this is having an effect on certain brushes in the form of glitches in stroke opacity (see attachment) on the SP4. Only turning off OpenGL or using the Dynamic Brush Tool seems to smooth out this problem. I haven't been able to reproduce this issue on the desktop as yet.
Also when creating a lot of strokes with OpenGL on and then clearing the canvas by going back to <empty> at the start of the undo history, blocks of the canvas are not refreshed until I draw over those parts of the canvas and hit undo or clear again.
Also, the choppiness and lag is very noticeable on a 7000 x 4000 image when the whole canvas is in view, and the blocks of stroke pop into view behind the pen as it moves across parts of the canvas that have not been drawn on yet. This does not occur when OpenGL is off. Ok, it looks like the same opacity glitch problem happens on the desktop as well. Does it matter whether you have instant preview on or not? Created attachment 98470 [details]
Brush with spacing controlled by speed
Same results whether Instant Preview is on or off.
I've attached another image that demonstrates this issue more clearly, as well as the brush used to create it. I've set the spacing to be controlled by the speed of the brush. The Dynamic Brush Tool doesn't eliminate these spacing fluctuations.
I'm not sure whether this particular issue is related to the other ones above or not, but it is related to OpenGL.
It looks like this bug is related to this one: https://bugs.kde.org/show_bug.cgi?id=362445 *** This bug has been marked as a duplicate of bug 359171 *** |