My understanding is that libgimp is for C plugins. Many libgimp functions
are in fact calls to PDB functions - see libgimp/gimppainttools_pdb.c for
example. The distinction between "high" and "low" level is not the one used
to determine what is in the PDB and what is not - despite what you say,
there are gimp-drawable-set-pixel and gimp-drawable-get-pixel procs in the
PDB.
It seems you are knowledgeable in writing interface code for Python. Why not
add gimp_export_image to the available python functions?
-----Original Message-----
From: Vladimir Rutsky
Sent: Thursday, June 19, 2014 11:52 PM
To: Ed .
Cc: gimp-developer
Subject: Re: How to call gimp_export_image() from
Pythonplugin
On 19.06.2014 22:09, Ed . wrote:
It is not a PDB function, but a libgimp (C) function. Since pygimp can do
gimpui stuff (also C functions), there is no conceptual reason why pygimp
shouldn't also handle gimpexport (which is where gimp_export_image lives).
Which functions in GIMP goes to PDB, and which stays only in libgimp?
As I understand, libgimp should contain _all_ functionality, that may be
needed for external C plugins. So it's "low-level" library.
PDB functions are designed to be called from scripts for automation and
easer writing custom plugins in Scheme/Python/Perl scripts.
So there mostly should be "high-level" functions, since there is no
point in calling "low-level" operations, like set_pixel(), due to
performance overhead of PDB.
gimp_export_image() is "high-level" function: it does several operations
on image as whole and optionally asks user for some input.
If gimp_export_image() would be available though PDB, it could be called
from any "fu"-script, that can call PDB functions, and there would be no
need to export it specifically in Python, Perl, Ruby, C#...
Correct me if I'm wrong, since I'm new to PDB and GIMP development.
I thought that in Python it was straightforward to access C functions?
This is simply a function that returns an integer, albeit one that uses
the GIMP UI - which pygimp already can initialise.
Best way to use C functions from Python is to write wrapper module in C
that will export methods as Python functions/classes (just as
GIMP-Python does).
Also you can load shared object and call C-function directly using
libffi library (presented as ctypes module in Python), but this
error-prone and really hackish way.
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