An odin ttf parser and hinter. It can parse both ttf and cff fonts with a hinting engine.

The ttf hinting engine is based off of freetype ttf hinter: https://github.com/freetype/freetype/tree/master

The cff virtual machine is based on stb_truetype: https://github.com/nothings/stb/blob/master/stb_truetype.h

This does not do any shaping nor does it do any raserization it simply just extracts the curves.

Please note that this has been ripped out of my own personal private project hence relying on some custom arenas. Additionally the curves extracted from the hinter api and unhinted code path are all in the form of quadratic bezier curves (my gpu solver only does quadratic bezier curves). You can keep these as is or replace them to integrate more with the odin core library.

Currently there are a few fonts that I do not hint correctly, ideally in the future I fix these up but most I have tested work correctly. Additionally there is no codepath for converting CFF cubic bezier curves into quadratic bezier curves (future thing to do) nor do the CFF curves have a hinter (another future thing to do).

As previously stated the curves you get out are quadratic bezier. You can go digging into the internals if you need something else, I still retain the original structure of the curves (line segments, quadratic bezier, cubics bezier), I just covert them to quadratic bezier right at the end.

my_file := #load("./CascadiaCode.ttf")
// your file can be in rodata no problem!
ttf_file, ok := ttf_from_data(my_file, context.allocator)
    
id_a := ttf_file.codepoint_to_glyph_index_map['a'] // typically you would get this from a shaper
unhinted_a, unhinted_a_ok := font_get_unhinted_glyph(ttf_file, id_a, context.allocator) // unhinted bezier curves for 'a'

// create a hinter at 20 ppem with a dpi of 96. You probably want to cache the hinter as it must run a large program on creation.
// you would not realise this if you were using freetype api
hinter, hinter_ok := hinter_program_make(ttf_file, 20, 96, context.allocator)
hinted_a, hinted_a_ok := hinter_program_get_hinted_glyph(hinter, id_a, context.allocator) // hinted bezier curves for 'a'

// cleanup
hinter_program_delete(hinter)
ttf_delete(ttf_file)