Behdad Esfahbod (بهداد اسفهبد) 42e28aa7ad [truetype] Update the VARC variation-store binary format. ...

Spec: https://github.com/harfbuzz/boring-expansion-spec/pull/175
Offset-base erratum: https://github.com/harfbuzz/boring-expansion-spec/issues/177

* src/truetype/ttvarc.c (tt_varc_evaluate_region, tt_varc_get_item_deltas):
  Read the sparse-region count as uint32, resolve each sparse axis through a
  region-relative Offset32, and follow the Offset32 to the delta-set INDEX.
  Bound the new offset fields and count arrays before dereferencing them.

* tests/varc/main.c (test_variation_store): New function to check
  translated outlines at default, midpoint, and peak coordinates.
  (main): Updated.

* tests/data/varc-null-condition.ttf, tests/data/varc-value-conditions.ttf:
  Updated to migrate the existing affected fixture without changing its
  logical contents or non-VARC tables.
* tests/data/varc-variation-store.ttf: New test file.

Tests: full Meson regression suite (3 passed).

Assisted-by: OpenAI Codex

2026-10-04 06:16:49 +02:00

2.7 KiB

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