* Raphaël Quinet <quinet@xxxxxxxxxx> [021129 18:38]:
> On Fri, 29 Nov 2002 11:29:12 -0500, Patrick McFarland <unknown@xxxxxxxxx> wrote:
> > Btw, has there been a discussion on how layer grouping will work?
> > I want to be able to both group layers in just a group (aka doesnt change
> > how rendering works at all) then also be able to group layers together, and
> > have the output of that act as a layer (aka, for calculating the "virtual"
> > layer, only the layers inside of it are done, no outside layers interact with
> > these except through the final "virtual" layer.)
>
> There has been some discussion about layer grouping, but I do not
> think that any concrete implementation proposals have ever been agreed
> upon. So anyone who could come up with a GUI mock-up is welcome.
> Code is even more welcome, of course. ;-)
>
> So as you mentioned yourself, there are two ways to define "groups":
> they have different purposes and need to be implemented differently.
A little while ago I added another little code project to my todo queue, it's
just a toy project but might end up providing useful ideas for the implementation.
I've been toying with the idea to create a small program that is built entirely
of plug-ins and allows you to build graphs of dataflow between inputs and outputs
of the plug-ins (nodes in the graph). And thus enable the coding of a function that
only blurs the brightness and not the color of an image to be "coded" visually
like this:
RGBA value_blur(RGBA,radius){
.--RGBA------.
| split_RGBA |
`-R--G--B--A-'
| | | |
| | | `---.
.-R--G--B-. \
| rgb2hsv | \
`-H--S--V-' \
| | \ \
| | \ |
| | .---V------. |
| | |blur(radius)|
| | `---V------'/
| | | /
| | / /
| | / /
.-H--S--V-. /
| hsv2rgb | /
`-R--G--B-' /
| | | /
.-R--G--B--A-.
| join_RGBA |
`--RGBA------'
}
At the moment I'm pondering about reference counting to avoid exhausting memory,
It'll take a little while until I have the time to start working on it, this is a much
more general approach, but if I end up with something viable at least the ideas can be
used to implement most kinds of layer grouping etc. since they will be graphs with
special constraints.
http://phpweb.hig.no/~oey_kola/graph.txt <- some more of my ascii ramblings.
I don't want to try to implemnt this in gimp directly since it's mostly playing
with some design ideas I have, but if the ideas work out nicely,. gimp should be
able to benefit from the fact that the problem has been attacked a little outside
gimp.
--
.^.
/V\ Øyvind Kolås, Gjøvik University College, Norway
/(_)\ <oeyvindk@xxxxxx>,<pippin@xxxxxxxxxxxxxxxxxxxxx>
^ ^
