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Dependencies

This project has a deliberately broad dependency surface because it targets multiple shaping/rendering backends across platforms. This document records the major external dependencies and why they exist.

Source of truth for versions: Cargo.toml ([workspace.dependencies]) and individual crate Cargo.toml files.

Rust (workspace)

Font parsing + font tables

  • skrifa, read-fonts: Font parsing, metrics, outlines, and OpenType table access (including color tables).

Text shaping

  • harfbuzz_rs: HarfBuzz shaping backend (typf-shape-hb).
  • harfrust: Rust shaping experiments / alternative backend (typf-shape-hr).
  • icu, icu_properties, icu_segmenter: Unicode normalization/segmentation for icu-hb shaping.

Rendering + geometry

  • kurbo: Curve/path geometry primitives used across renderers.
  • tiny-skia: CPU rasterization used directly and as an engine in typf-render-color.
  • resvg, usvg: OpenType-SVG glyph rendering (typf-render-color SVG feature).
  • png: PNG decode/encode for bitmap glyphs and exports.

GPU / hybrid rendering (vendored)

  • wgpu: GPU abstraction for the vello renderer backend.
  • Vendored vello_* crates under external/vello/…: GPU (hybrid) and CPU rendering engines used by typf-render-vello / typf-render-vello-cpu.

Caching + concurrency

  • moka: Bounded cache with TinyLFU admission (scan-resistant), used for shaping/rendering caches.
  • parking_lot: Low-overhead synchronization primitives.
  • rayon: Optional parallelism for CPU-heavy workloads.
  • lru: Legacy/auxiliary LRU usage (gradually being replaced by moka).

Error handling + logging

  • thiserror: Typed error enums.
  • anyhow: Application-level error composition (primarily CLIs/tools).
  • log, env_logger: Logging facade + default logger.

Input validation

  • language-tags: BCP 47 language-tag parsing/canonicalization for CLI, batch, and JSONL language hints.

Platform bindings

  • objc2 + objc2-* crates: macOS CoreText/CoreGraphics integration.

Python

  • maturin: Builds the typfpy extension module from Rust.
  • fire: Python CLI wrapper.

Policy

  • Prefer well-maintained, widely-used crates over bespoke code.
  • Avoid adding new dependencies unless they remove complexity or are required for a backend.