[fonttools/fonttools] c7c349: Allow original axis ranges when instancing VARC fo...

[Behdad Esfahbod]

Branch: refs/heads/main
Home: https://github.com/fonttools/fonttools
Commit: c7c3493ebf868e47c659f2fd43c9c2873dc5894e
https://github.com/fonttools/fonttools/commit/c7c3493ebf868e47c659f2fd43c9c2873dc5894e
Author: Behdad Esfahbod <beh...@behdad.org>
Date: 2026-10-12 (Mon, 12 Oct 2026)

Changed paths:
M Lib/fontTools/varLib/instancer/__init__.py
M Tests/varLib/instancer/varc_test.py

Log Message:
-----------
Allow original axis ranges when instancing VARC fonts (#4280)

* Treat original axis ranges as no-op instancing requests

Assisted-by: Codex

* [varLib.instancer] Compare original ranges at fvar precision

Compare requested and original axis ranges after converting both to 16.16 fixed point. Decimal limits such as wght=356.5:840.3 then match the stored fvar range and avoid the VARC referenced-axis restriction.

Cover two- and three-value decimal ranges, in-memory and stored fvar values, and one-unit changes that must still be rejected, with and without avar2. All eight equivalent-range cases fail before the fix. Validated with 417 instancer tests passed, three optional tests skipped, and the reported CLI example.

Assisted-by: Codex



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