chore: switch freetype to swash

[nyurik]

fixes #32

Note that I have not actually had a chance to study the results in depth to see if the conversion is what is desired vs older stack

[Copilot]

Pull request overview

This PR replaces the FreeType-based glyph rasterization path with a Swash-based Rust font renderer, updating feature flags, public APIs, docs, tests, and CI accordingly.

Changes:

• Replace freetype-gated rendering with a new font module built on swash (FontFace / FontRenderer).
• Rename pbf_font_tools’ glyph-generation feature to generate and update glyph generation code + integration test expectations.
• Update workspace dependencies and CI/publish workflows to remove FreeType and use the new feature flags.

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sdf_glyph_renderer/src/lib.rs	Switch feature-gated module wiring from ft/FreeType to font/Swash.
sdf_glyph_renderer/src/ft.rs	Remove the old FreeType-based rendering implementation.
sdf_glyph_renderer/src/font.rs	Add Swash-based font loading and glyph rasterization to bitmap/SDF.
sdf_glyph_renderer/src/error.rs	Replace FreeType error variants with font-data/glyph-missing errors under font.
sdf_glyph_renderer/README.md	Update documentation to describe the new font feature and remove FreeType references.
sdf_glyph_renderer/Cargo.toml	Swap dependency from freetype-rs to optional swash; set default feature to font.
pbf_font_tools/tests/integration_tests.rs	Update test gating and assertions for Swash-based generation behavior.
pbf_font_tools/src/lib.rs	Rename/repoint generation module and re-exports from FreeType to FontFace.
pbf_font_tools/src/font_generate.rs	Rework glyph generation to use FontFace + FontRenderer instead of FreeType faces.
pbf_font_tools/src/error.rs	Remove FreeType error plumbing; gate SDF glyph errors behind generate.
pbf_font_tools/README.md	Update feature docs from FreeType to generate (font-file generation).
pbf_font_tools/Cargo.toml	Replace freetype* features with generate and make it default.
Cargo.toml	Remove freetype-rs workspace dep and add swash.
Cargo.lock	Update lockfile for Swash + transitive dependencies; remove FreeType stack.
build_pbf_glyphs/src/main.rs	Switch CLI font loading from FreeType to FontFace with shared Arc<[u8]> data.
build_pbf_glyphs/README.md	Remove FreeType bundling/build notes.
build_pbf_glyphs/Cargo.toml	Update dependency feature from freetype to generate.
.github/workflows/publish.yml	Update publish feature flags from freetype to font/generate.
.github/workflows/ci.yml	Remove explicit --features freetype usage and Windows/FreeType workarounds.

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[ianthetechie]

This is interesting! I have never heard of this dependency before so I'll want to check it out first.

While I agree with the spirit of #32 (I don't want the C deps either; they're a headache!), I am not quite sure if this is the correct approach. In #16, I mention a few crates that would not only get us to Rust, but also result in better renders. I think we should probably solve for that first, and freetype will naturally fall away.

There's an open PR where @lseelenbinder threw Claude Code at it for fun a few months ago, but I think that was the web-based version which has crappy capabilities compared to running via the app/CLI locally on max effort. Feel free to take a stab at it if you like.