Re: [Gimp-developer] How to deal with pixel-per-pixel operations?

[Alessandro Francesconi <alessandrofrancesconi live it>]

Thank you everyone for the kind response!
I've decided to stay with 2.8 APIs, so I won't use GEGL for now.

Going back to the initial question, what's the best example to see how to iterate a 5x5 mask (but size could 
be variable) for each pixel without losing performance?

In particular, what combination of functions should I use (talking about gimpdrawable, pixelrgn, iterators 
and so on)?

Thank you again
Ale



> Subject: Re: [Gimp-developer] How to deal with pixel-per-pixel operations?
> From: mitch gimp org
> To: alessandrofrancesconi live it
> CC: pippin gimp org; gimp-developer-list gnome org
> Date: Tue, 11 Jun 2013 15:47:34 +0200
>
> On Tue, 2013-06-11 at 14:03 +0200, Alessandro Francesconi wrote:
> > Got problems here...
> >
> > Following the goat example, I downloaded the libgegl-dev 0.2 package (I'm on Debian)
>
> For GIMP git master, you need babl master and gegl master, no tarballs.
>
> --Mitch
>
> >  and I've started including the necessary libs in my source code:
> >
> > -----
> > #include <libgimp/gimp.h>
> >
> > #include <libgimp/gimpui.h>
> >
> > #include <gegl.h>
> > -----
> >
> > gegl_init() is recognized, but gimp_drawable_get_buffer() and gimp_drawable_get_shadow_buffer() don't.
> > They appears to be defined in the git repository, here: 
> > https://git.gnome.org/browse/gimp/tree/libgimp/gimpdrawable.h
> > But looking at the gimp 2.8.4 libs I have in my machine, gimpdrawable.h does not contain those 
> > definitions!
> >
> > Don't tell me... gimp_drawable_get_buffer() and similar are not yet in the set of available APIs for 
> > GIMP-dev 2.8.4.... is it right? How can I develop a GEGL plugin for 2.8.4 application in these 
> > conditions? .-.
> >
> >
> > Sincerely,
> > (a bit angry) Ale
> >
> >
> > > From: alessandrofrancesconi live it
> > > To: pippin gimp org
> > > Date: Tue, 11 Jun 2013 10:53:26 +0000
> > > CC: gimp-developer-list gnome org
> > > Subject: Re: [Gimp-developer] How to deal with pixel-per-pixel operations?
> > >
> > > Thank you so much!
> > >
> > >
> > >
> > > Ale
> > >
> > >
> > >
> > > Da: Øyvind Kolås
> > > Data invio: ‎martedì‎ ‎11‎ ‎giugno‎ ‎2013 ‎12‎.‎49
> > > A: Alessandro Francesconi
> > > Cc: gimp-developer-list gnome org
> > >
> > > On Tue, Jun 11, 2013 at 11:05 AM, Alessandro Francesconi <alessandrofrancesconi live it> wrote:
> > >
> > >
> > > Thanks for the answer, I’m not new on GIMP plugin’s development but I’m totally new on GEGL operations!
> > >
> > > After a first look, it seems that none of the standard plugins from the GIMP’s procedure database use 
> > > GEGL for their operations, and the only way to test a operation made with GEGL is to open this dialog: 
> > > http://docs.gimp.org/it/gimp-tool-gegl.html
> > >
> > > .... am I wrong?
> > >
> > >
> > > I mean, is it possible to define a new plugin using the classical method with 
> > > ’gimp_install_procedure()’, making it accessible through the PDB and writing a ”complex” user interface 
> > > with GTK, but using GEGL APIs for the image manipulation phase?
> > >
> > >
> > >
> > >
> > > Take a look at goat-exercise.c in gimp/plug-ins/common, it shows how to get and manipulate image 
> > > drawables as GeglBuffers. For documentation on GEGL see http://gegl.org/ or the docs dir of your own 
> > > GEGL build.
> > >
> > >
> > >
> > >
> > > /Ø
> > > -- 
> > > «The future is already here. It's just not very evenly distributed»
> > >                                                  -- William Gibson
> > > http://pippin.gimp.org/                            http://ffii.org/
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> > > gimp-developer-list gnome org
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