Drew's fast Rust CoreText bindings

Provides select Rust bindings for Apple Core Text framework. This may be compared to the core-text crate or some parts of the core-foundation-rs crate.

Implementation status

• CTFontDescriptor
• CTFontManager::CreateFontDescriptorFromData
• Most of SFNTLayoutTypes.h

Why this crate

Part of the objr expanded universe, distinctive features of this library:

• Fast. This crate is significantly faster than other approaches. If you are interested in writing performance-critical realtime applications, this is the solution for you.
  • The full set of optimization is far too many to list, but the big idea is to either do what native ObjC/Swift applications do, or do something faster.
  • Compile-time selectors. Most Rust crates do a runtime lookup for ObjC methods, which involves acquiring a lock and other yucky stuff, either on the first call or every call. Instead, we do what real ObjC compilers do, which is way faster. For more details, see objr
  • Smart pointers that provide global ARC inference. Like ARC, you don't need to write manual retain/release calls. Unlike ARC, the compiler usually doesn't need to write them either, meaning lower runtime memory management cost than even native code. For more details, see objr.
  • Runtime autorelease eliding, which keeps your objects out of autoreleasepools in common cases. For more details, see objr.
  • Pointer packing for optional types so they fit in a u64. For more details, see objr
• Safe APIs. Where possible APIs are designed with safe abstractions to provide familiar guarantees to Rust developers
• Low-level. These bindings assume familiarity with bound APIs and are not documented separately. For details on how they work, see the native documentation.
• Free for noncommercial or "small commercial" use.