Edit Color in a wallpaper

[dinasset]

Thanks Ofnuts.
I suppose it's a "c" plug-in, so unreadable for me.
Does someone who reads "c" (assuming the source is available) understand "which" rotation will it do by default? 0-90 to 90-180? or what?

Edit: written a small .py to test it, but it seems "non existent" in 2.10