Crate sr_aef 

sr-aef

sr-aef “uncompiles” an OpenType/TrueType font back into Adobe Feature File (fea) source code. It reads the OpenType layout tables (GSUB, GPOS and, optionally, GDEF) out of a compiled binary font and reconstructs an equivalent feature file using the fea_rs_ast AST.

Because binary fonts lose the original structure of their layout code (lookup splitting, class naming, comments, …), the output is a faithful functional reconstruction rather than a byte-for-byte copy of the original source.

The main entry points are uncompile, uncompile_bytes and uncompile_context:

use sr_aef::{fea_rs_ast::AsFea, uncompile_bytes};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let data = std::fs::read("MyFont.ttf")?;
    // `true` also uncompiles the GDEF table.
    let feature_file = uncompile_bytes(&data, true)?;
    println!("{}", feature_file.as_fea(""));
    Ok(())
}

The crate also powers the TrueType round-trip in babelfont.

Re-exports

pub use fea_rs_ast;

pub use skrifa;

Structs

UncompileContext

The context object that holds all the information we need when uncompiling a font.

Functions

uncompile

Uncompile a TTF font into a fea file.

uncompile_bytes

Uncompile a TTF font from a byte slice into a fea file. See uncompile() for details.

uncompile_context

Uncompile a TTF font to a context object.