automatic backend selection for Piet
piet-common
is a crate that chooses an appropriate implementation of the
Piet 2D graphics API, for the current platform.
On Windows, the backend will be piet-direct2d, on macOS
piet-coregraphics, and on Linux, OpenBSD, FreeBSD and NetBSD piet-cairo.
The piet-web backend can be selected with the web
feature.