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.
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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