[Gegl-developer] RE: Managed bindings

[George Talusan]

I think it makes perfect sense for GeglGraph to be moved into or
possibly subclassed from GeglNode.  The concepts are similar enough to
warrant such a change.

In response to Samee's post, I don't care much for a stabilized API at
this point.  The C# bindings are automatically generated by GAPI.  The
bindings thunk down into native code so it's not like I'm re-writing
GEGL in C#.  However if a new library is released then the .so version
is bumped and it doesn't really affect my bindings at all.

In the worst case I can always statically link for the short term.

george



On Sun, 2006-29-10 at 02:37 +0200, Øyvind Kolås wrote:
> On 10/28/06, George Talusan <george at convolve.ca> wrote:
> > Hello,
> >
> > I too am interested in a gegl-sharp library in particular for F-Spot.
> >
> > I've used GAPI to create a set of managed bindings for GEGL.  I've run
> > into a few problems trying to convert GEGL's hello-world.c into my own
> > gegl-sharp hello-world.cs.
> >
> > 1.  gegl_graph_new returns a GeglNode.  While this is plausible in C
> > through the magic of casting, it creates a circular dependency in C#.
> > The metaphor GAPI creates for us is: "A Node is a Graph.  While a Graph
> > is a Node."
> 
> The reason I changed gegl_graph_new to return a GeglNode instead of a
> graph was to avoid casting in C. It might even make sense to move all
> of the code in the GeglGraph super class into the GeglNode subclass to
> avoid the issue completely (I already dislike the large amount of code
> needed in the GeglNode class though.)
> 
> > 2.  There are lots of instances of va_list usage in the API.  Examples
> > are the gegl_node_set/get functions.
> >
> > I'm not very familiar with the GEGL source so I was wondering if there
> > are any suggestions on how we could get the ball rolling to make GEGL
> > binding friendly?
> 
> It shouldn't be harder to bind GEGL than to bind gobject itself. Like
> gobject gegl also provides functions to set/get individual properties:
> 
> void          gegl_node_set_property        (GeglNode     *object,
>                                              const gchar  *property_name,
>                                              const GValue *value);
> void          gegl_node_get_property        (GeglNode     *object,
>                                              const gchar  *property_name,
>                                              GValue       *value);
> 
> I presume this should be sufficient.
> 
> /Øyvind K.