Yay! :-) On 20 January 2015 at 15:08, Jon Nordby <jononor@xxxxxxxxx> wrote: > Hi, > > a long standing enhancement[1] in GEGL has been to allow loading > meta-operations from a serializable file instead of requiring them to be > coded in C. > At 31c3 I started working on this, and yesterday it reached a generally > working state. Today I merged the code to master[2]. > > Each .json file of right format that is found in the module path for GEGL > will create a new GeglOperationMeta subclass. It will be register it with > the specified operation name, and exported properties/pads. > When the operation is instantiated, it builds up the subgraph of GeglNodes > specified and connects. Property changes on the meta-operation are forwarded > onto the real node inside. > > An example of the .json format can be seen here: > https://git.gnome.org/browse/gegl/tree/operations/json/grey2.json > This is a format also used by other dataflow/flow-based-programming > tools[3]. > > This for instance allows one to use the node-based editor Flowhub+imgflo to > build a new image filter, save it as .json and then use it in GIMP[4] > (screenshot). One can of course also hand-write the json files, or implement > other editors for these. > It might make sense to also implement serialization of a graph/sub-graph to > this format directly in GEGL itself. > > Note: This adds json-glib 1.0 as a dependency of GEGL, so make sure you have > it installed (including development headers). > > References > 1. https://bugzilla.gnome.org/show_bug.cgi?id=465743 > 2. > https://git.gnome.org/browse/gegl/commit/?id=564f45bad76eb0f888e628ea70345912dd68cbbb > 3. http://noflojs.org/documentation/json > 4. https://twitter.com/jononor/status/557570481206099969 > > -- > Jon Nordby - www.jonnor.com > > _______________________________________________ > gegl-developer-list mailing list > List address: gegl-developer-list@xxxxxxxxx > List membership: https://mail.gnome.org/mailman/listinfo/gegl-developer-list > > _______________________________________________ gegl-developer-list mailing list List address: gegl-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gegl-developer-list
