[Gimp-developer] Question about how Gimp displays multiple layers

[Gregory Hosler]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi all,

I'm working on a gtk application, and I have a need to display a composite image. i.e. a
base image, with a 2nd (much smaller) image overlaying a part of the bigger 1st image.
Periodically I may need to move the smaller image to a different location within the
bigger image.

My first attempt was to use the GtkFixed widget, and put both images into the GtkFixed
container. The problem I faced is that GtkFixed will always layer the larger image on top
of the smaller image (at least this is my observation, and I cannot figure out how to
control the layering order for GtkFixed).

In [minimal] playing around with Gimp, I am aware that Gimp has the ability to create a
composite image, out of multiple layers. I'm kinda curious as to the algorithms (pointers
to within the code welcome), and whether there are widgets that are more suited to this,
rather than the GtkFixed (that I could not get to work for me).

I do not mind loading a pixbuf, and then replacing a designated section of it with the
smaller image's pixbuf, if that is what it takes... I cannot figure out from the gtk
pixbuf devhelp pages how I might achieve this though.

Any thoughts/comments are most welcome.

Thanks, and best rgds,

- -Greg

- --
+---------------------------------------------------------------------+

Please also check the log file at "/dev/null" for additional information.
		(from /var/log/Xorg.setup.log)

| Greg Hosler					ghosler at redhat.com    |
+---------------------------------------------------------------------+
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (GNU/Linux)

iD8DBQFH8NCq404fl/0CV/QRAnelAJ42K0vVFIy/4g6u1CCQGTdu+v2buwCbBpIZ
8xUITPrCcFIJqPbMpCu98Ew=
=lmCC
-----END PGP SIGNATURE-----