`plotters 0.3.3` updated from `font-kit 0.10.0` to `0.11.0`. This is an
internal dependency and ostensibly wouldn't be a breaking change, except
that `font-kit 0.11.0` added a dependency on `yeslogic-fontconfig-sys`
which has additional system dependency requirements. This had the effect
of breaking compilation in a non-breaking release.
However, `font-kit` is only required for `BitMapBackend`, which is not
part of our public API and is only used by some of the `halo2_gadgets`
tests. So we can avoid affecting our downstream users by disabling the
default-enabled features of `plotters`.
`BatchVerifier` now manages the entire batch verification process.
Individual proofs are verified on a threadpool, and the resulting MSMs
are then batch-checked as before. The addition of parallelism here
couples with zcash/halo2#608 to make parallelism less fine-grained and
reduce the overhead of multi-threading.
We also set `resolver = "2"` on the workspace; this is the default for
the root package in Rust 2021, but as we use a virtual workspace we need
to explicitly set it instead.
The published source code for each package needs to include the required
header file, and the path to that header file needs to be relative to
the package source (not the repository source). We therefore need to
have the header file present in each workspace package.
Closeszcash/halo2#506.
Jack Grigg
Sean Bowe
Taylor Hornby
therealyingtong