ttf-parser

A high-level, safe, zero-allocation TrueType font parser.

Can be used as Rust and as C library.

Features

• A high-level API for most common features, hiding all parsing and data resolving logic.
• A low-level API for for some complex TrueType tables, still hiding raw data layout.
• A C API.
• Zero heap allocations.
• Zero unsafe.
• Zero dependencies.
• no_std/WASM compatible.
• Fast. See the Performance section.
• Stateless. No mutable parsing methods.
• Simple and maintainable code (no magic numbers).

Safety

• The library must not panic. Any panic considered as a critical bug and should be reported.
• The library forbids the unsafe code.
• No heap allocations, so crash due to OOM is not possible.
• All recursive methods have a depth limit.
• Technically, should use less than 64KiB of stack in the worst case scenario.
• Most of arithmetic operations are checked.
• Most of numeric casts are checked.

Alternatives

It's very hard to compare different libraries, so we are using table-based comparison. There are roughly three types of TrueType tables:

• A table with a list of properties (like head, OS/2, etc.).
  If a library tries to parse it at all then we mark it as supported.
• A table that contains a single type of data (glyf, CFF (kinda), hmtx, etc.).
  Can only be supported or not.
• A table that contains multiple subtables (cmap, kern, GPOS, etc.).
  Can be partially supported and we note which subtables are actually supported.

| Feature/Library | ttf-parser | FreeType | stb_truetype | | ----------------- | :--------------------: | :-----------------: | :----------------------------: | | Memory safe | ✓ | | | | Thread safe | ✓ | | ~ (mostly reentrant) | | Zero allocation | ✓ | | | | Variable fonts | ✓ | ✓ | | | Rendering | -¹ | ✓ | ~ (very primitive) | | avar table | ✓ | ✓ | | | bdat table | | ✓ | | | bloc table | | ✓ | | | CBDT table | ✓ | ✓ | | | CBLC table | ✓ | ✓ | | | CFF table | ✓ | ✓ | ~ (no seac support) | | CFF2 table | ✓ | ✓ | | | cmap table | ~ (no 8) | ✓ | ~ (no 2,8,10,14; Unicode-only) | | EBDT table | | ✓ | | | EBLC table | | ✓ | | | fvar table | ✓ | ✓ | | | gasp table | | ✓ | | | GDEF table | ~ | | | | glyf table | ~² | ✓ | ~² | | GPOS table | ✓ | | ~ (only 2) | | GSUB table | ✓ | | | | gvar table | ✓ | ✓ | | | head table | ✓ | ✓ | ✓ | | hhea table | ✓ | ✓ | ✓ | | hmtx table | ✓ | ✓ | ✓ | | HVAR table | ✓ | ✓ | | | kern table | ~ (no AAT 1) | ~ (only 0) | ~ (only 0) | | maxp table | ✓ | ✓ | ✓ | | MVAR table | ✓ | ✓ | | | name table | ✓ | ✓ | | | OS/2 table | ✓ | ✓ | | | post table | ✓ | ✓ | | | sbix table | ~ (PNG only) | ~ (PNG only) | | | SVG table | ✓ | | ✓ | | vhea table | ✓ | ✓ | | | vmtx table | ✓ | ✓ | | | VORG table | ✓ | ✓ | | | VVAR table | ✓ | ✓ | | | Language | Rust + C API | C | C | | Tested version | 0.13.0 | 2.10.4 | 1.24 | | License | MIT / Apache-2.0 | FTL / GPLv2 | public domain |

Legend:

• ✓ - supported
• ~ - partial
• nothing - not supported

Notes:

1. While ttf-parser doesn't support rendering by itself, there are mutliple rendering libraries on top of it: rusttype, ab-glyph and fontdue.
2. Matching points are not supported.

Performance

TrueType fonts designed for fast querying, so most of the methods are very fast. The main exception is glyph outlining. Glyphs can be stored using two different methods: using Glyph Data format and Compact Font Format (pdf). The first one is fairly simple which makes it faster to process. The second one is basically a tiny language with a stack-based VM, which makes it way harder to process.

The benchmark tests how long it takes to outline all glyphs in the font.

| Table/Library | ttf-parser | FreeType | stb_truetype | | ------------- | -------------: | ---------: | -------------: | | glyf | 0.915 ms | 1.258 ms | 0.718 ms | | gvar | 3.545 ms | 4.288 ms | - | | CFF | 1.365 ms | 5.992 ms | 2.836 ms | | CFF2 | 1.982 ms | 6.859 ms | - |

Note: FreeType is surprisingly slow, so I'm worried that I've messed something up.

And here are some methods benchmarks:

text test outline_glyph_276_from_cff2 ... bench: 867 ns/iter (+/- 15) test from_data_otf_cff ... bench: 968 ns/iter (+/- 13) test from_data_otf_cff2 ... bench: 887 ns/iter (+/- 25) test outline_glyph_276_from_cff ... bench: 678 ns/iter (+/- 41) test outline_glyph_276_from_glyf ... bench: 649 ns/iter (+/- 11) test outline_glyph_8_from_cff2 ... bench: 534 ns/iter (+/- 14) test from_data_ttf ... bench: 467 ns/iter (+/- 11) test glyph_name_post_276 ... bench: 223 ns/iter (+/- 5) test outline_glyph_8_from_cff ... bench: 315 ns/iter (+/- 13) test outline_glyph_8_from_glyf ... bench: 291 ns/iter (+/- 5) test family_name ... bench: 183 ns/iter (+/- 102) test glyph_name_cff_276 ... bench: 62 ns/iter (+/- 1) test glyph_index_u41 ... bench: 16 ns/iter (+/- 0) test glyph_name_cff_8 ... bench: 5 ns/iter (+/- 0) test glyph_name_post_8 ... bench: 2 ns/iter (+/- 0) test subscript_metrics ... bench: 2 ns/iter (+/- 0) test glyph_hor_advance ... bench: 2 ns/iter (+/- 0) test glyph_hor_side_bearing ... bench: 2 ns/iter (+/- 0) test glyph_name_8 ... bench: 1 ns/iter (+/- 0) test ascender ... bench: 1 ns/iter (+/- 0) test underline_metrics ... bench: 1 ns/iter (+/- 0) test strikeout_metrics ... bench: 1 ns/iter (+/- 0) test x_height ... bench: 1 ns/iter (+/- 0) test units_per_em ... bench: 0.5 ns/iter (+/- 0) test width ... bench: 0.2 ns/iter (+/- 0)

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.