[calligra/krita-chili-kazakov] krita/plugins/paintops: Add a skeleton stacked brush paintop

[Boudewijn Rempt]

On Wed, 27 May 2015, Lukast dev wrote:

> Hello boud and dmitryK,
> have you considered to realize the stacked brush through multihand tool?
> One would have to create UI for selecting brush preset for every KisPainter in multihand tool.
> Then it is just a matter of transformation, for stacking two brushes you would use identity transformation.
> 
> Advantages:
> - useful with any brush engine 
> - it would be possible to stack n brushes
> - new possibilities: mirroring or symetry or with different brush engines
> 
> Why paintop?
>

I never thought of that...

But well, the idea is to let the stacked brush stack paintop presets (any 
number, any brush engine) with offset and blending mode. And if it's done 
as a brush engine, it can be used with any tool, including the multihand 
tool. If it's done as variant on the multihand tool, the other painting 
tools can't use it.

Boudewijn