About automatic disable of LoD mode when the brushes are very small

[Timothée Giet]

Hi,

This is a very tricky idea. While we do have some ideas about which 
brush settings can make it heavier to compute (big size, low spacing, 
smudge effect, other parameters for each brush engine...), the threshold 
where they make the brush slower depends on lot of things, like:
-How are they combined ? (and considering all the possible combinations, 
this is the hardest part)
-How powerful is the hardware ?
-The operating system (linux vs windows vs mac, gpu drivers..)
-The amount of events/second sent from the input/graphic tablet

So I believe those threshold would be quite different for each user. Of 
course we can find some defaults and make it possible to configure, but 
how to do it in an easy to use an efficient way is the big question.



Le 19/12/2015 12:25, Raghavendra Kamath a écrit :
>
> Hello,
>
> The thought was to disable instant preview (LOD) when it is not 
> required automatically , for example in small basic and less resource 
> intensive brushes,
>
> I am assuming we sort of know what parameters effect the speed of 
> brushes e.g size above certain range or precision settings etc. So 
> can't we trigger instant preview when the preset parameter crosses a 
> certain threshold.
>
> This is just a suggestion, there is an option to switch off the 
> preview when not required but IMO when a person is drawing he normally 
> just grabs a brush and paints , it will be some time to get trained to 
> remember enabling Instant preview whenever he uses larger brushes.
>
> Simply said instant preview is there to enhance user experience when 
> the user is drawing with larger and heavy presets , so by enabling it 
> on smaller basic brushes we are in some way doing double work by 
> adding a preview when in fact they work smoothly without any enhancement.
>
> This was my thought, any suggestion or debate is welcome.
>
> On Saturday 19 Dec 2015 12:17:51 PM Dmitry Kazakov wrote:
>
> > Hi, all!
>
> >
>
> > Yesterday on IRC Raghavendra suggested quite an interesting idea 
> about the
>
> > optimization of the Instant Preview mode. The idea sounded like that:
>
> >
>
> > "What if we automatically disable Instant Preview for the brushes 
> when they
>
> > are small enough to be painted without LoD, directly on the canvas. This
>
> > would prevent quite a noisy flickering on the canvas, when the update it
>
> > finished."
>
> >
>
> > I though about it. Technically, I can implement this this feature. It is
>
> > possible to switch off LoD almost on the fly. But the main question 
> is the
>
> > following:
>
> >
>
> > "How would we decide if the brush is slow or fast?"
>
> >
>
> > At the moment we cannot know if the brush is slow or fast without 
> running
>
> > the stroke. And if we have already started the LoD stroke, we cannot 
> switch
>
> > it to original one seamlessly. The original stroke should start from the
>
> > very beginning. So how should we know if LoD should be activated for 
> this
>
> > particular preset or not?
>
> >
>
> > Basically, the user already has an option to choose whether the preset
>
> > should be run in LoD or not [0]. Should we do any automatic helping 
> for him?
>
> >
>
> >
>
> > [0] - https://userbase.kde.org/Krita/Manual/BrushEngines/InstantPreview
>
> >
>
> >
>
> > PS:
>
> > This letter is more like a heap of thoughts, so any comments are 
> welcome! :)
>
> >
>
> > --
>
> Raghavendra Kamath
>
> Illustrator
>
> 9867272640
>
> raghukamath.com <www.raghukamath.com>
>
>
>
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