simoncozens

name

rust-fontations-patterns

description

Idioms for reading, manipulating and writing OpenType fonts in Rust with the fontations crates (read-fonts, skrifa, write-fonts and fontdrasil). Use this when writing any Rust code that parses font tables, draws outlines, measures glyphs, works with design-space coordinates/locations (including avar), edits layout tables (GSUB/GPOS/GDEF/STAT) or builds/modifies font binaries. No project-specific abstractions — only the public crate APIs.

OpenType Font Manipulation in Rust (fontations)

Idioms for the fontations family of crates, as used in real-world font tooling:

| Crate | Version | Role |

simoncozens

simoncozens

@AllLetters = [ n ]; # Add some more letters here... But don't include the space!
@OneAway    = [ n.oneaway ]; # a.oneaway b.oneaway etc.
@TwoAway    = [ n.twoaway ];
@Peak       = [ n.peak ];
lookup oneaway { sub @AllLetters by @OneAway; } oneaway;
lookup twoaway { sub @allLetters by @TwoAway; } twoaway;
lookup peak { sub @AllLetters by @Peak; } peak;

feature rclt {

simoncozens

from glyphsLib import load, to_designspace
from ufo2ft.featureCompiler import FeatureCompiler, parseLayoutFeatures
from fontTools.feaLib import ast
import argparse


class Checker:
    def __init__(self, sources):
        self.masters = []
        for source in sources:

simoncozens

import uuid
from glyphsLib import load, GSPath, GSNode, GSLayer
from fontTools.varLib.models import VariationModel, normalizeValue
import numpy as np
from tqdm import tqdm
import argparse


def interpolate_paths_without(glyph, intermediate_layer, intermediate_location):
    tags = [axis.axisTag for axis in glyph.parent.axes]

simoncozens

#!/opt/homebrew/bin/python3
import sys

sys.path.insert(0, "/Users/simon/others-repos/ufo2ft/Lib")

from glyphsLib.classes import GSFont
from glyphsLib.builder import UFOBuilder
from glyphsLib.builder.font import fill_ufo_metadata
from fontmake.font_project import FontProject
from timeit import default_timer as timer

simoncozens

import requests
from dateutil.relativedelta import relativedelta, FR
from datetime import datetime
import os

lastweek = datetime.utcnow().replace(hour=0,microsecond=0) + relativedelta(weekday=FR(-1))
headers = {"Authorization": "bearer "+os.environ["GITHUB_TOKEN"]}


def run_query(query):

simoncozens

import sys
import os

DEFAULT_NGRAM_SIZE = 5


def all_ngrams(word, size=None):
    if size is None:
        size = DEFAULT_NGRAM_SIZE
    for i in range(max(1, len(word) - size)):

simoncozens

from fontTools.ttLib import TTFont
from fontTools.ttLib.tables.otBase import OTTableWriter
import sys
from fontTools.feaLib.lookupDebugInfo import LOOKUP_DEBUG_INFO_KEY

font = TTFont(sys.argv[1])

def locate(table, ix):
	if "Debg" not in font:
		return str(ix)

simoncozens

Justification with Variable Fonts

• In JSTF header

Type	Name	Description
uint16	majorVersion	Major version of the JSTF table, = 1
uint16	minorVersion	Minor version of the JSTF table, = 0
uint16	jstfScriptCount	Number of JstfScriptRecords in this table
JstfScriptRecord	jstfScriptRecords[jstfScriptCount]	Array of JstfScriptRecords, in alphabetical order by jstfScriptTag