[Gimp-developer] Drawing zones

[David Gowers]

On 1/18/07, Thorsten Wilms <t_w_ at freenet.de> wrote:
>
>
> I usually work with a bunch of alpha-locked layers (paint shape in
> flat-colour,
> lock alpha, paint shadows, light, texture ...)
>
> I guess the perfect zone implementation would actualy need some overlap
> to have the same effect of alpha-locked layers.
>
> In fact, the best simple solution could be to copy selection masks onto
> > layer masks. Like, you have a 'painting' layer, and when you change
> zones:
> >    1. Any changes are saved onto the underlying layer
> >    2. The entire content of the underlying layer is copied to the paint
> > layer
> >    3. The layer mask is copied from the next zone-mask (channel)
> >
> > This would play well with my 'apply paint' plugin, which applies any
> paint
> > on a layer (specially marked by name, beginning with the character '+')
> to
> > the underlying layer and then clears it to a neutral color.
>
> In short, drawing zones happening on the level of layer masks?


Drawing zones happening by layer masks.
This would allow you to decrease the total layer count needed while
maintaining cleanness.


Another model I thought about would require a graph, so I guess
> it's really a bit far out for GIMP: Having a layer/node for


Ehe, have you poked around with the GEGL editor at all? As GIMP begins to
use GEGL more and more, there are various almost 'free' features that would
be a side effect of using GEGL:

Graph based image model (most likely shown as a simplification of the
underlying GEGL graph), hence Layer grouping also.
Adjustment layers

Those are the most relevant features.
I've heard that the painting system would also be GEGL-based,
so what you describe below may be possible (though it would probably be
after 2.6 at the least.)

compositing drawing layers/nodes. It would be like a free-form
> multi-split view on a number of layers. Drawing starting in one
> zone of the view and continuing the stroke outside of it could
> paint on the underlying layer/node, maintaining the advantage
> that using layers has now: you can draw below a layer and later
> change the shape of an upper layer without having to fill a gap.



What you describe is not exactly a graph -- because the destination is
variable. I can think of a design with a few additional nodes that would
make it work though.
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