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feat: Fidelity API — generic lossy/near-lossless/lossless encode quality (#12) #22

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feat: Fidelity API — generic lossy/near-lossless/lossless encode quality (#12) #22

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12 changes: 12 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -6,6 +6,18 @@ All notable changes to zencodec are documented here.

### Added

- **Fidelity API** (`encode::{Fidelity, LossyTarget, NearLosslessBudget,
QualityMetric, FidelityMatch}`) — a generic lossy / near-lossless / lossless
encode-quality abstraction for [#12](https://github.com/imazen/zencodec/issues/12).
`Fidelity` is a sum type (lossy with a
`LossyTarget`, near-lossless within a per-channel `NearLosslessBudget`, or
lossless). `EncoderConfig` gains `with_fidelity` (infallible, best-effort),
`try_target_fidelity` (fail-fast, returns `FidelityMatch`),
`resolved_target_fidelity`, and `with_alpha_fidelity`/`alpha_fidelity` (lossy
color + lossless alpha). `EncodeCapabilities` gains `near_lossless`,
`supports_distance`, `supports_metric_target`, `supports_size_target`. Default
impls bridge to the legacy `with_generic_quality`/`with_lossless` scalars, so
the change is additive and non-breaking. Design: `docs/near-lossless-design.md`.
- `ThreadingPolicy::resolve_thread_count()` — cross-codec shared helper that
translates a [`ThreadingPolicy`] to the integer thread count that
native-threaded encoder libraries (rav1e/ravif, dav1d/rav1d, libwebp, etc.)
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