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List:       kde-bugs-dist
Subject:    [krita] [Bug 363487] brush lags behind when making quick or long strokes
From:       William Kensinger <bugzilla_noreply () kde ! org>
Date:       2017-02-10 15:04:43
Message-ID: bug-363487-17878-x9uiuEoXcq () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=363487

--- Comment #19 from William Kensinger <Will89310@gmail.com> ---
(In reply to Robert Showalter from comment #18)
> Thank you for checking Boudewijn.  I did more tests and discovered it
> happens for some brushes, but not others.  I suspect it's the brush spacing
> that reveals the bottleneck. When using the circle brush presets for
> example, a standard one like "Fill_circle" does not have discernible lag
> when 5 layers deep (a paint layer within 4 nested groups, that is). However,
> when I use another present like "ink_circle_10" the lag is significant when
> nested in groups, but non-existent outside of them. One of the main
> differences between the two is that the first one has spacing set to auto
> and the second's spacing is <1. 
> 
> Come to think of it, when I first noticed the problem I was using David
> Revoy's 8.1 brush presets
> (http://www.davidrevoy.com/article319/krita-brushkit-v8), many of which have
> brush spacing <1. Sure enough, when I set spacing to "auto" for
> "ink_circle_10," indeed the lag goes away (unfortunately, this alters the
> look for many brushes). 
> 
> This whole thing wouldn't be a problem, except that so many standard brushes
> have tight spacing and will not work well when nested. That is, if you can
> reproduce it with the same brush and it's not something with my setup. I'd
> be curious to know. I went a head and recorded my screen to show the problem
> (forgive me for using my phone, I wanted to be sure there's no question
> about screen recording taxing the system).
> https://drive.google.com/open?id=0BxKOKqLVyGC-QUR2OWZtVXp3RGs
> 
> As you can see in the video, I'm using the circle brush preset,
> "ink_circle_10." It's a simple setup as I mentioned before; A 2k square
> image with 4 nested groups containing a paint layer, and one un-nested paint
> layer for comparison. Here's the file for safe measure:
> https://drive.google.com/open?id=0BxKOKqLVyGC-eXQwZGJ4Um44TEU

Just dropping in to confirm that the bug is still happening for me under
windows as of 3.1.2. I can vouch for Robert here, spacing does decrease the lag
significantly for me, though it doesn't eliminate it completely.

Also, I feel like this shouldn't be marked as resolved, as it's clearly still
happening. Should I change the label there?

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