GEGL kaleidoscope

[teapot]

(Yesterday, 07:36 AM)trandoductin Wrote: Thanks teapot.
Do you have an example of how you call gegl command?

Tricky, there are several versions floating around. I believe the original was by paynekj, Kevin Payne.  I use the one below but I cannot remember where I got it.

In my plugin I import it:

import gegl_command

and call it:

gegl_command.gegl_command(image, layer, gegl_string)

You can call it via the pdb but that's much slower:

pdb.python_gegl(image, new_layer, gegl_string)

EDIT: Do not use this version, see post #8.

Code:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

print 'gegl_command.py: __name__', __name__

import sys
import ctypes
import gimpfu

def load_library(lib):
   pl = sys.platform

   if pl == 'linux' or pl == 'linux2':
       return ctypes.CDLL(lib + '.so.0')

   if pl == 'win32':
       return ctypes.CDLL(ctypes.util.find_library(lib + '-0'))

   raise BaseException('TODO:' + pl)

gimp = load_library('libgimp-2.0')
gegl = load_library('libgegl-0.4')

gegl.gegl_init(None, None)
print 'gegl_command.py: gegl done'

def gegl_command(image, drawable, gegl_graph_string):
   overlap, x, y, w, h = gimpfu.pdb.gimp_drawable_mask_intersect(drawable)
   if not overlap:
       return

   class GeglBuffer(ctypes.Structure):
       pass
   GeglBufferPtr = ctypes.POINTER(GeglBuffer)

   gimp.gimp_drawable_get_shadow_buffer.restype = GeglBufferPtr
   gimp.gimp_drawable_get_buffer.restype = GeglBufferPtr
   gegl.gegl_render_op.restype = None

   drawable_id = drawable.ID
   source = gimp.gimp_drawable_get_buffer(drawable_id)
   target = gimp.gimp_drawable_get_shadow_buffer(drawable_id)
   gegl.gegl_render_op(source, target, 'gegl:gegl',
           'string', ctypes.c_char_p(gegl_graph_string),
           ctypes.c_void_p()
       )
   print 'source=', source, 'target=', target

   gegl.gegl_buffer_flush.restype = None
   gimp.gimp_drawable_merge_shadow.restype = ctypes.c_bool
   gimp.gimp_drawable_update.restype = ctypes.c_bool

   gegl.gegl_buffer_flush(target)
   okay = gimp.gimp_drawable_merge_shadow(drawable_id, PushUndo=True)
   print 'merge okay=', okay
   okay = gimp.gimp_drawable_update(drawable_id, x, y, w, h)
   print 'update okay=', okay

   # gimp_displays_flush takes approximately 1/6th second.
   # gimp.gimp_displays_flush()

def init():
   print 'gegl_command.py: registering python_gegl'
   gimpfu.register(
       'python_gegl',          # name
       'Gegl Command',         # blurb
       'Gegl Command . . .',   # help
       'paynekj',              # author
       'paynekj',              # copyright
       '2021',                 # date
       'Gegl Command',         # menu name
       'RGB,RGBA',             # image types
       [
           (gimpfu.PF_IMAGE,    'image',             'Input image',       None),
           (gimpfu.PF_DRAWABLE, 'drawable',          'Input drawable',    None),
           (gimpfu.PF_TEXT,     'gegl_graph_string', 'Graph',             ''),
       ],
       [],
       gegl_command,
       menu='<Image>/Python-Fu' # menu path
   )

if __name__ == '__main__':
   init()
   gimpfu.main()