• Bug fixes for “AAT” shaping, and other shaping micro optimizations.

• Fix a shaping regression affecting mark glyphs in certain fonts.
• Fix pruning of mark filtering sets when subsetting fonts, which caused changes in shaping behaviour.

• Make shaping fail much faster for certain malformed fonts (e.g., those that
  trigger infinite recursion).
• Fix undefined behaviour introduced in 11.4.2.
• Fix detection of the “Cambria Math” font when fonts are scaled, so the
  workaround for the bad MATH table constant is applied.

• Various performance and memory usage improvements.
• The hb-shape command line tool can now be built with the amalgamated harfbuzz.cc source.
• Fix regression in handling version 2 of avar table.
• Increase various buffer length limits for better handling of fonts that generate huge number of glyphs per codepoint (e.g. Noto Sans Duployan)
• Improvements to the harfrust shaper for more accurate testing.

• Fix clang compiler warnings.

What's Changed

• General shaping and subsetting speedups.
• Fix in Graphite shaping backend when glyph advances became negative.
• Subsetting improvements, pruning empty mark-attachment lookups.
• Don't use the macro name _S, which is reserved by system liberaries.
• Build fixes and speedup.
• Add a kbts shaping backend that calls into the kb_text_shape
  single-header shaping library. This is purely for testing and
  performance evaluation and we do NOT recommend using it for any
  other purposes.

What's Changed

• Fix bug in vertical shaping of fonts without the vmtx table.

What's Changed

• Fix build with non-compliant C++11 compilers that don't recognize the "and" keyword.

What's Changed

• Fix crasher in the glyph_v_origin function introduced in 11.3.0.

What's Changed

• Speed up handling fonts with very large number of variations:

  • Drawing by up to 40%.
  • Calculating glyph extents by up to 15%.
  • Getting horizontal glyph advances by up to 45%.

• Speed up getting horizontal and vertical glyph advances by up to 24%.

• Significantly speed up vertical text shaping.

• Various documentation improvements.

• Various build improvements.

• Various subsetting improvements.

• Various improvements to Rust font functions (fontations integration) and shaper (HarfRust integration).

• Rename harfruzz option and shaper to harfrust following upstream rename.

• Implement hb_face_reference_blob() for DirectWrite font functions.

• New API:
  +hb_font_get_glyph_origins_func_t
  +hb_font_get_glyph_h_origins_func_t
  +hb_font_get_glyph_v_origins_func_t
  +hb_font_funcs_set_glyph_h_origins_func()
  +hb_font_funcs_set_glyph_v_origins_func()
  +hb_font_get_glyph_h_origins()
  +hb_font_get_glyph_v_origins()

New Contributors

• @jmckenna made their first contribution in #5337
• @tintou made their first contribution in #5364
• @benjamin-otte made their first contribution in #5363
• @gay-chicken made their first contribution in #5373
• @caolanm made their first contribution in #5389
• @chr-thien made their first contribution in #5391

Full Changelog: 11.2.1...11.3.0