- Python 100%
| Filename | Latest commit message | Latest commit date |
|---|---|---|
Alexander Pecheny
fbb4785288
Reusable acute-anchor patcher, an inspector and a typst proof renderer, plus the build scripts for the three fonts fixed so far. Sofia Sans Ru and Pliant are kept as they were run; the Pliant kerning modules are recovered from the session that produced the installed files. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> |
||
| pliant-kerning | ||
| .gitignore | ||
| acutefix.py | ||
| build_roboto_flex_fix.py | ||
| build_sofia_sans_ru.py | ||
| inspect_acute.py | ||
| proof.py | ||
| README.md | ||
fonts-fixing
Scripts for patching fonts that typeset Russian badly, plus the proof renderer used to
check the results by eye. Everything runs through uv and needs typst on PATH for proofs.
Stress marks (U+0301)
Most fonts list only Latin glyphs in their GPOS mark-to-base coverage, so a combining
acute lands after the letter instead of over it. acutefix.py adds the missing anchors:
X from the glyph's bounding-box center, Y copied from the font's own Latin O/o anchors
so the result matches its precomposed Á/á. Two refinements matter in practice:
- Ю and ю take the center of their rightmost contour — over the bowl, not the whole width.
- The acute is usually a steeply slanted parallelogram. Centering its bounding box makes it read as pointing at the left half of the letter, so the midpoint of its lower edge — the end it visually points with — is what gets centered instead.
uv run inspect_acute.py ~/Library/Fonts/RobotoFlexFix/RobotoFlexFix-Regular.ttf
uv run build_roboto_flex_fix.py
uv run proof.py "Roboto Flex Fix" some/older-version.ttf --size 100
proof.py takes installed family names and/or .ttf paths and renders them as rows of one
image, so before/after versions of the same font can sit side by side.
Fonts built here
| Font | What was wrong |
|---|---|
build_roboto_flex_fix.py → Roboto Flex Fix |
No Cyrillic acute anchors, and typst ignores variable axes so every weight rendered as Regular. Emits static Regular/Italic/Bold/Bold Italic. |
build_sofia_sans_ru.py → Sofia Sans Ru |
Bulgarian letterforms by default (moved to ss01), no acute anchors on Cyrillic vowels. |
pliant-kerning/batch.py → Pliant |
Almost no Cyrillic kerning, and the single-storey a was the default. |
The Sofia and Pliant scripts are kept as they were run rather than refactored onto
acutefix.py — those fonts are installed and correct, and the scripts carry work
(the Russian-default transform, the autokerning model) that is the point of keeping them.
Why variable fonts get instanced
Typst 0.14 warns variable fonts are not currently supported and uses only the default
instance, so chgksuite compose pdf --font 'Roboto Flex' rendered every bold run at
weight 400. typst fonts --variants is the quick check: a usable family lists more than
one weight.