Re: [Gimp-developer] Gimp 2.99 python3 plug-ins: writing a plugin to generate an image

[Shlomi Fish <shlomif shlomifish org>]

Hi Gottfried!

On Mon, 13 Jul 2020 10:29:32 +0200
Gottfried Müller <gottfried mueller gmx de> wrote:

> Hello
>
> is it possible writing a plug-in to generate an image without an opened
> image? I found no examples. As a test I tried to open a file image only.
> I've got the following message:
>
> GIMP-Error: Procedure 'python-fu-openImageFile' has been called with an
> invalid ID for argument 'image'. Most likely a plug-in is trying to work
> on an image that doesn't exist any longer.
>
> Here a code snippet:
>
> def openImageFile(procedure, args, data):
>      print("start openImageFile")
>      return procedure.new_return_values(Gimp.PDBStatusType.SUCCESS,
> GLib.Error())
>
>
> class OpenImageFile(Gimp.PlugIn):
>
>      def do_query_procedures(self):
>          return ["python-fu-openImageFile"]
>
>      def do_create_procedure(self, name):
>          data = None
>          procedure = Gimp.ImageProcedure.new(
>              self, name, Gimp.PDBProcType.PLUGIN, openImageFile, data
>          )
>          procedure.set_documentation(DESCR_SHORT, DESCR_LONG, name)
>          procedure.set_attribution(AUTHOR, COPYRIGHT, DATE)
>          procedure.set_menu_label(MENU_LABEL)
>          procedure.add_menu_path(MENU_PATH)
>          return procedure
>
> Gimp.main(OpenImageFile.__gtype__, sys.argv)

Perhaps this will help:

https://github.com/shlomif/gimp-lepton-support-for-dropbox-jpeg-compression/blob/87fde8b6252f6f6694b8ef5b97d5727925d74a7e/gimp-lepton/gimp-2.99/file-lepton.py

(short URL: https://is.gd/TlTlIF )

It is a gimp-python extension to open dropbox lepton .lep files:

https://github.com/dropbox/lepton

It took me some experimentation to write as well.

> I tried also an scheme script using gimp-file-load. It is using a GFile
> argument now. In 2.10 I could use a filename. How to create a GFile in
> scheme in 2.99?

Don't know about scheme.

> Gottfried
>
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-- 

Shlomi Fish       https://www.shlomifish.org/
Why I Love Perl - https://shlom.in/joy-of-perl

Larry Wall *does* know all of Perl. However, he pretends to be wrong
or misinformed, so people will underestimate him.
    — https://www.shlomifish.org/humour/bits/facts/Larry-Wall/

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