Issues

• Shared offsets in GSUB, GPOS and GDEF make the first shape take seconds (and gigabytes)

  harfbuzz/harfrust#540 · Filter by author HeadMader opened on Oct 15, 2026
  1

• Legacy AAT kern truncates glyph ids to u16 when looking up classes

  harfbuzz/harfrust#532 · Filter by author Goudarz opened on Oct 12, 2026
  1

• Chromium integration: remaining C API and build gaps after the merged compatibility work

  harfbuzz/harfrust#520 · Filter by author behdad opened on Oct 8, 2026
  

• Fractional GPOS variation advances differ at 16.16 scale in Skia

  harfbuzz/harfrust#517 · Filter by author behdad opened on Oct 7, 2026

• Skia integration: remaining HarfRust C API gaps, including PDF subsetting

  harfbuzz/harfrust#507 · Filter by author behdad opened on Oct 7, 2026
  2

• Expose equivalent HB version in HR C API

  harfbuzz/harfrust#494 · Filter by author behdad opened on Oct 4, 2026
  

• glyph extents/bounds return None for CFF fonts (no glyf table)

  harfbuzz/harfrust#479 · Filter by author jxoesneon opened on Sep 22, 2026
  1

  

• Gaps in the HarfRust C FFI and how to fill them

  harfbuzz/harfrust#468 · Filter by author dfrg opened on Sep 5, 2026

• Plan for supporting hb_ot_layout_* baselines in the C FFI

  harfbuzz/harfrust#467 · Filter by author dfrg opened on Sep 5, 2026

• Plan for supporting hb_ot_math_* functions in the C FFI

  harfbuzz/harfrust#466 · Filter by author dfrg opened on Sep 5, 2026

• Question about license for unicode data

  harfbuzz/harfrust#408 · Filter by author alexanderkjall opened on Jul 14, 2026
  7

• Decide what to do if scale is not set

  harfbuzz/harfrust#392 · Filter by author behdad opened on Jun 20, 2026
  

• HarfRust should not panic on an invalid language

  harfbuzz/harfrust#372 · Filter by author drott opened on May 29, 2026
  3

• Need external ICU callbacks for Chromium integration

  harfbuzz/harfrust#360 · Filter by author drott opened on May 21, 2026
  5

• [RFC] Ongoing comparative performance analysis.

  harfbuzz/harfrust#312 · Filter by author xorgy opened on Dec 28, 2025
  2

• [Feature Request] Use a generic TableProvider instead of directly depending on FontRef

  harfbuzz/harfrust#308 · Filter by author 2A5F opened on Dec 9, 2025
  1

• Exposing normalisation data to external consumers

  harfbuzz/harfrust#297 · Filter by author taj-p opened on Nov 12, 2025
  4

• More extensive, systematic comparison of HarfBuzz and HarfRust shaping

  harfbuzz/harfrust#288 · Filter by author khaledhosny opened on Oct 18, 2025
  2

• Too much dirty data in the library

  harfbuzz/harfrust#277 · Filter by author behdad opened on Sep 24, 2025
  9

• Repeated pair positioning lookups could probably be optimized

  harfbuzz/harfrust#256 · Filter by author valadaptive opened on Sep 10, 2025
  9

  

• Export for GlyphExtents and UnicodeBuffer internals

  harfbuzz/harfrust#91 · Filter by author asibahi opened on Jul 24, 2025
  5

• Failure to set direction results in an unhelpful failure from a seemingly infallible method

  harfbuzz/harfrust#84 · Filter by author rsheeter opened on Jul 2, 2025
  2

• Enable use of ltag table

  harfbuzz/harfrust#51 · Filter by author dfrg opened on May 13, 2025

• buffer add_str maybe take an option to add utf-8 clusters?

  harfbuzz/harfrust#47 · Filter by author behdad opened on May 12, 2025
  5

• Set up oss-fuzz / CIFuzz fuzzing

  harfbuzz/harfrust#28 · Filter by author behdad opened on May 9, 2025