cl-libheif is a wrapper around libheif library which is a library for
manipulation with HEIF format. Currently, this wrapper has support for
encoding and decoding of toplevel images and extraction of metadata. Also,
currently only images with 8 bits per color are supported.
Dependencies:
- libheif >= 1.17.6 (with headers!)
- libffi
- C compiler, due to limitations in CFFI