What’s Changed

• Unicode 16.0.0 support.
• Various documentation fixes.
• Various build fixes.
• Add API to allow HarfBuzz client to set what glyph to use when a Unicode Variation Selector is not supported by the font, which would allow the client to customize what happens in this case, by using a different font for example.
• Add a callback to for “hb_face_t” for getting the list of table tags. This is now used to make calling “hb_face_get_table_tags()” work on a faces created by “hb_face_create_for_tables()” (e.g. faces returned by “hb_subset_or_fail()”).
• CGJ and Mongolian Variation Selectors are now ignored during glyph positioning, previously they would block both glyph substitution and positioning across them.
• Support cairo script as an output format for “hb-view” command line tool.
• Drop an optimization that would cause HarfBuzz not apply pair positioning lookup subtables under certain circumstances, for compatibility with other implementations that do apply these subtables.
• Subsetting will now fail if source font has no glyphs, so feeding the subsetter invalid data will not silently return an empty face.
• If after partially instancing a font no variation data is left (the instance is fully static), don’t consider this a failure.
• Workaround a Firefox bug in displaying SVGs generated be “hb-view” command line tool under certain circumstances.
• Fix bug in macroman mapping for “cmap” table.
• Fix difference shaping output when HarfBuzz is built with with “HB_NO_OT_RULESETS_FAST_PATH” enabled.
• Various subsetting and instancing fixes.
• Various fuzzing fixes.
• Add “with_libstdcxx” meson build option.