Hi,
some time ago, someone posted a link to an example code and documentation on
how to develop themes for twin.
http://www.usermode.org/docs/kwintheme.html
I tried to port to TDE and added some cmake to build. I update also the
document on the example code.
It is parked here now
https://mirror.git.trinitydesktop.org/gitea/deloptes/twintheme-example