pyusp — Uniscribe (usp10) OpenType shaping tracer (Windows / Linux / macOS wheel)

PyO3 abi3 wheel (pyusp-…-py3-none-win_amd64.whl) wrapping the pyusp Rust engine. Shapes in-process via a Uniscribe implementation and returns the babelsoft /api/opentype/shape engine dict.

from pyusp import shape_with_uniscribe
res = shape_with_uniscribe(font_bytes, text)          # script auto-detected
res = shape_with_uniscribe(font_bytes, text, script="mong")

Engines. The wheel ships wineusp.dll, Wine's open-source Uniscribe port (LGPL), which also provides a real per-lookup trace (trace=True). It drives the OS usp10.dll (Microsoft Uniscribe) as the authoritative reference — the Microsoft DLL is not bundled in the published wheel (it is an OS component and not redistributable); the engine loads it from the system at runtime. A dev/test-only build (python/build_wheel.ps1) may additionally pin an app-local copy of usp10.dll; see python/pyusp/NOTICE.md and python/pyusp/NOTICE-wineusp.md.

Native Microsoft trace (Windows). With backend="textshaping", trace=True (on Windows x64) the engine hooks the system TextShaping.dll apply driver and returns a native per-application glyph-run timeline straight from the Microsoft engine (stages named textshaping apply N). This trace has no lookup names (the engine does not expose them) and is only enabled on validated TextShaping.dll builds (Win11 24H2 / 10.0.26100 x64) — anything else raises a clear error. See python/pyusp/NOTICE-native-trace.md.

from pyusp import shape_with_uniscribe
res = shape_with_uniscribe(font_bytes, text, backend="textshaping", trace=True)  # Windows

Scope note: usp10 only recognises legacy OpenType script tags. Fonts that use only modern tags (e.g. Devanagari faces exposing dev2, not deva) are not shaped by Uniscribe at all — this matches what old Win32 apps that rely on usp10 actually experience.

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pyusp — Uniscribe (usp10) OpenType shaping tracer (Windows / Linux / macOS wheel)

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