Harfbuzz Versions Save

Support fonts with more than 65535 glyphs in GDEF, GSUB, and GPOS tables. This is part of boring-expansion-spec to extend OpenType in a backward-compatible way. (Behdad Esfahbod, Garret Riegerr)

Complete support for more than 65535 glyphs in glyf table that started in 4.0.0 release. Part of boring-expansion-spec. (Behdad Esfahbod)

Support version 2 of avar table. Part of boring-expansion-spec. (Behdad Esfahbod)

Fix mark attachment on multiple substitutions in some cases. (Behdad Esfahbod)

Fix application of calt, rclt, and ccmp features to better match Uniscribe behaviour with some Arabic fonts. (Behdad Esfahbod)

Improvement to interaction between multiple cursive attachments. (Behdad Esfahbod)

Improve multiple mark interactions in Hebrew. (Behdad Esfahbod)

Implement language-specific forms in AAT shaping. (Behdad Esfahbod)

Fix variation of VORG table. (Behdad Esfahbod)

Support for specific script tags to be retained in the subsetter, and add --layout-scripts option to hb-subset tool. (Garret Rieger)

Accept space as delimiter for --features/--variations in command line tools. (Behdad Esfahbod)

Improve subsetting of COLR table. (Qunxin Liu)

Improved fuzzing coverage for ot-math API. (Frédéric Wang)

Fix kern table version 2 (AAT) sanitization on 32-bit systems. (Behdad Esfahbod)

Allow negative glyph advances from graphite2 shaper. (Stephan Bergmann)

Implement loading (color) bitmap fonts with hb-ft. (Behdad Esfahbod)

Fix regression in hb-ft when changing font size. (Behdad Esfahbod)

Fix build on GCC < 7. (Kleis Auke Wolthuizen)

Dynamically load dwrite.dll on windows if directwrite shaper is enabled. (Luca Bacci)

Provide a single-file harfbuzz-subset.cc file for easier alternate building of hb-subset library, similar to harfbuzz.cc. (Khaled Hosny)

New API +HB_SUBSET_SETS_LAYOUT_SCRIPT_TAG +hb_language_matches()

Caching of variable fonts shaping, in particular when using HarfBuzz’s own font loading functions (ot). Bringing performance of variable shaping in par with non-variable fonts shaping. (Behdad Esfahbod)

Caching of format 2 “Contextual Substitution” and “Chained Contexts Substitution” lookups. Resulting in up to 20% speedup of lookup-heavy fonts like Gulzar or Noto Nastaliq Urdu. (Behdad Esfahbod)

Improved ANSI output from hb-view. (Behdad Esfahbod)

Support for shaping legacy, pre-OpenType, Windows 3.1-era, Arabic fonts that relied on a fixed PUA encoding. (Khaled Hosny, Behdad Esfahbod)

Sinhala script is now shaped by the USE shaper instead of “indic” one. (Behdad Esfahbod, David Corbett)

Thai shaper improvements. (David Corbett)

hb-ot-name API supports approximate BCP-47 language matching, for example asking for “en_US” in a font that has only “en” names will return them. (Behdad Esfahbod)

Optimized TrueType glyph shape loading. (Behdad Esfahbod)

Fix subsetting of HarfBuzz faces created via hb_face_create_for_tables(). (Garret Rieger)

Add 32 bit var store support to the subsetter. (Garret Rieger)

New API +HB_BUFFER_FLAG_DEFINED +HB_BUFFER_SERIALIZE_FLAG_DEFINED +hb_font_changed() +hb_font_get_serial() +hb_ft_hb_font_changed() +hb_set_hash() +hb_map_copy() +hb_map_hash()

Major speed up in loading and subsetting fonts, especially in handling CFF table. Subsetting some fonts is now 3 times faster. (Behdad Esfahbod, Garret Rieger)

Speed up blending CFF2 table. (Behdad Esfahbod)

Speed up hb_ot_tags_from_language(). (Behdad Esfahbod, David Corbett)

Fix USE classification of U+10A38 to fix multiple marks on single Kharoshthi base. (David Corbett)

Fix parsing of empty CFF Index. (Behdad Esfahbod)

Fix subsetting CPAL table with partial palette overlaps. (Garret Rieger)

New API +hb_map_is_equal() (Behdad Esfahbod)

Source code reorganization, splitting large hb-ot-layout files into smaller, per-subtable ones under OT/Layout/*. Code for more tables will follow suit in later releases. (Garret Rieger, Behdad Esfahbod)

Revert Indic shaper change in previous release that broke some fonts and instead make per-syllable restriction of “GSUB” application limited to script-specific Indic features, while applying them and discretionary features in one go. (Behdad Esfahbod)

Fix decoding of private in gvar table. (Behdad Esfahbod)

Fix handling of contextual lookups that delete too many glyphs. (Behdad Esfahbod)

Make “morx” deleted glyphs don’t block “GPOS” application. (Behdad Esfahbod)

Various build fixes. (Chun-wei Fan, Khaled Hosny)

New API +hb_set_next_many() (Andrew John)

Various OSS-Fuzz fixes. (Behdad Esfahbod)

Make fallback vertical-origin match FreeType’s. (Behdad Esfahbod)

Treat visible viramas like dependent vowels in USE shaper. (David Corbett)

Apply presentation forms features and discretionary features in one go in Indic shaper, which seems to match Uniscribe and CoreText behaviour. (Behdad Esfahbod, David Corbett)

Various bug fixes.

New API +hb_set_add_sorted_array() (Andrew John)

Update OpenType to AAT mappings for hist and vrtr features. (Florian Pircher)

Update IANA Language Subtag Registry to 2022-03-02. (David Corbett)

Update USE shaper to allow any non-numeric tail in a symbol cluster, and remove obsolete data overrides. (David Corbett)

Fix handling of baseline variations to return correctly scaled values. (Matthias Clasen)

A new experimental hb_subset_repack_or_fail() to repack an array of objects, eliminating offset overflows. The API is not available unless HarfBuzz is built with experimental APIs enabled. (Qunxin Liu)

New experimental API +hb_link_t +hb_object_t +hb_subset_repack_or_fail()

New public API to create subset plan and gather information on things like glyph mappings in the final subset. The plan can then be passed on to perform the subsetting operation. (Garret Rieger)

Draw API for extracting glyph shapes have been extended and finalized and is no longer an experimental API. The draw API supports glyf, CFF and CFF2 glyph outlines tables, and applies variation settings set on the font as well as synthetic slant. The new public API is not backward compatible with the previous, non-public, experimental API. (Behdad Esfahbod)

The hb-view tool will use HarfBuzz draw API to render the glyphs instead of cairo-ft when compiled with Cairo 1.17.5 or newer, setting HB_DRAW environment variable to 1 or 0 will force using or not use the draw API, respectively. (Behdad Esfahbod)

The hb-shape and hb-view tools now default to using HarfBuzz’s own font loading functions (ot) instead of FreeType ones (ft). They also have a new option, --font-slant, to apply synthetic slant to the font. (Behdad Esfahbod)

HarfBuzz now supports more than 65535 (the OpenType limit) glyph shapes and metrics. See https://github.com/be-fonts/boring-expansion-spec/issues/6 and https://github.com/be-fonts/boring-expansion-spec/issues/7 for details. (Behdad Esfahbod)

New API to get the dominant horizontal baseline tag for a given script. (Behdad Esfahbod)

New API to get the baseline positions from the font, and synthesize missing ones. As well as new API to get font metrics and synthesize missing ones. (Matthias Clasen)

Improvements to finding dependencies on Windows when building with Visual Studio. (Chun-wei Fan)

New buffer flag, HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT, that must be set during shaping for HB_GLYPH_FLAG_UNSAFE_TO_CONCAT flag to be reliably produced. This is to limit the performance hit of producing this flag to when it is actually needed. (Behdad Esfahbod)

Documentation improvements. (Matthias Clasen)

New API

• General: +HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT +hb_var_num_t

• Draw: +hb_draw_funcs_t +hb_draw_funcs_create() +hb_draw_funcs_reference() +hb_draw_funcs_destroy() +hb_draw_funcs_is_immutable() +hb_draw_funcs_make_immutable() +hb_draw_move_to_func_t +hb_draw_funcs_set_move_to_func() +hb_draw_line_to_func_t +hb_draw_funcs_set_line_to_func() +hb_draw_quadratic_to_func_t +hb_draw_funcs_set_quadratic_to_func() +hb_draw_cubic_to_func_t +hb_draw_funcs_set_cubic_to_func() +hb_draw_close_path_func_t +hb_draw_funcs_set_close_path_func() +hb_draw_state_t +HB_DRAW_STATE_DEFAULT +hb_draw_move_to() +hb_draw_line_to() +hb_draw_quadratic_to() +hb_draw_cubic_to() +hb_draw_close_path() +hb_font_get_glyph_shape_func_t +hb_font_funcs_set_glyph_shape_func() +hb_font_get_glyph_shape()

• OpenType layout +HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_CENTRAL +HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_CENTRAL +hb_ot_layout_get_horizontal_baseline_tag_for_script() +hb_ot_layout_get_baseline_with_fallback()

• Metrics: +hb_ot_metrics_get_position_with_fallback()

• Subset: +hb_subset_plan_t +hb_subset_plan_create_or_fail() +hb_subset_plan_reference() +hb_subset_plan_destroy() +hb_subset_plan_set_user_data() +hb_subset_plan_get_user_data() +hb_subset_plan_execute_or_fail() +hb_subset_plan_unicode_to_old_glyph_mapping() +hb_subset_plan_new_to_old_glyph_mapping() +hb_subset_plan_old_to_new_glyph_mapping()