i took a closer look, but had a hard time to compile it, using mingw.
- it needs c++17 support, is that absolutely nessecary ?
- make it as portable as possible (must run on linux/g++, apple/clang, android, etc)
- do you really need Eigen for a simple 2d transform ?
- what happens if there is no SIMD support ?
- do you have any links / papers explaining the algorithms used ?