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NEWS
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Overview of changes leading to 10.4.0
Saturday, March 1, 2025
====================================
- Drawing glyphs using hb-draw API now avoids any “malloc” calls, which
improves drawing performance by 10+%.
- Add support new “GVAR” table fonts with more than 65535 glyphs. Support is
currently behind a compilation flag and is disabled by default.
- Some hb-directwrite and hb-ft APIs got renamed with more clear names and the
old names are deprecated.
- Various build and fuzzing fixes.
- New API:
+hb_directwrite_face_get_dw_font_face()
+hb_ft_font_get_ft_face()
- Deprecated API:
+hb_directwrite_face_get_font_face()
+hb_ft_font_get_face()
Overview of changes leading to 10.3.0
Thursday, February 11, 2025
====================================
- Vastly improved “AAT” shaping performance. LucidaGrande benchmark-shape
before: 14.6ms after: 5.9ms.
- Improved OpenType shaping performance (kerning / ligature), at the expense of
~1kb per face allocated cache memory. Roboto-Regular benchmark-shape before:
10.3ms after: 9.4ms.
- Improved “COLRv1” benchmark-font paint performance. Before: 7.85ms after
4.85ms.
- Don’t apply glyph substitutions in “morx” table of a font with known broken
“morx” table (AALMAGHRIBI.ttf font).
- Update IANA and OT language registries.
- Various documentation updates.
- Various build improvements, and test speed-ups.
- The “hb_face_reference_blob()” API now works for faces created with
“hb_face_create_for_tables()” if the face sets “get_table_tags” callback.
This constructs a new face blob from individual table blobs.
- Various fixes to how “trak” table is handled to bring it closer to Core Text
behaviour. Particularly, the tracking values for sizes not explicitly set in
the table are now properly interpolated, and the tracking is applied to glyph
advances when they are returned by ot-font functions, instead of applying
them during shaping. The “trak” pseudo OpenType feature that could be used to
disable “trak” table application have been dropped.
- Core Text font functions now support non-BMP code points.
- The drawing algorithm used by hb-draw for “glyf” table now match the
algorithm used by FreeType and Core Text.
- The “hb_coretext_font_create()” API now copy font variations from Core Text
font to the created HarfBuzz font.
- Add an API to get the feature tags enabled on a given shape-plan after
executing it, which can be used to applications to show in the UI what
features are applied by default (which can vary based on the font, the
script, the language, and the direction set on the buffer).
- Add APIs to created HarfBuzz font from DirectWrite font, and copy the font
variations.
- New API:
+hb_directwrite_font_create()
+hb_directwrite_font_get_dw_font()
+hb_ot_shape_plan_get_feature_tags()
Overview of changes leading to 10.2.0
Saturday, January 11, 2025
====================================
- Consider Unicode Variation Selectors when subsetting “cmap” table.
- Guard hb_cairo_glyphs_from_buffer() against malformed UTF-8 strings.
- Fix incorrect “COLR” v1 glyph scaling in hb-cairo.
- Use locale-independent parsing of double numbers is “hb-subset” command line
tool.
- Fix incorrect zeroing of advance width of base glyphs in various “Courier New”
font versions due to incorrect “GDEF” glyph classes.
- Fix handling of long language codes with “HB_LEAN” configuration.
- Update OpenType language system registry.
- Allow all Myanmar tone marks (including visarga) in any order
- Don’t insert U+25CC DOTTED CIRCLE before superscript/subscript digits
- Handle Garay script as right to left script.
- New API for serializing font tables and potentially repacking them in optimal
way. This was a previously experimental-only API.
- New API for converting font variation setting from and to strings.
- Various build fixes
- Various subsetter and instancer fixes.
- New API:
+hb_subset_serialize_link_t
+hb_subset_serialize_object_t
+hb_subset_serialize_or_fail()
+hb_subset_axis_range_from_string()
+hb_subset_axis_range_to_string()
Overview of changes leading to 10.1.0
Tuesday, November 5, 2024
====================================
- Fix the sign of fallback vertical glyph advance (used when font has no
vertical advance data).
- Increase maximum “CFF” operands limit 20 times to support more complex fonts.
- Add “--face-loader” option to command line utilities.
- Support “COLR” v0 table in hb_font_get_glyph_extents().
- Add support for font functions that use Core Text APIs, similar to FreeType
font functions. This allows, for example, using drawing fonts that use the new
(and undocumented) “hvgl” table.
- Update IANA and OT language registries, as well ase USE data files.
- Fix build with ICU 76.
- Various compiler warnings and build fixes.
- Various subsetter fixes.
- New API:
+hb_face_create_or_fail()
+hb_face_create_from_file_or_fail()
+hb_coretext_face_create_from_file_or_fail()
+hb_coretext_font_set_funcs()
+hb_ft_face_create_from_file_or_fail()
Overview of changes leading to 10.0.1
Tuesday, September 24, 2024
====================================
- Relax sanitization checks for “morx” subtables to fix broken AAT shaping of
macOS 15.0 version of GeezaPro.
Overview of changes leading to 10.0.0
Monday, September 23, 2024
====================================
- 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.
- New API:
+HB_SCRIPT_GARAY
+HB_SCRIPT_GURUNG_KHEMA
+HB_SCRIPT_KIRAT_RAI
+HB_SCRIPT_OL_ONAL
+HB_SCRIPT_SUNUWAR
+HB_SCRIPT_TODHRI
+HB_SCRIPT_TULU_TIGALARI
+hb_buffer_set_not_found_variation_selector_glyph()
+hb_buffer_get_not_found_variation_selector_glyph()
+hb_get_table_tags_func_t
+hb_face_set_get_table_tags_func()
Overview of changes leading to 9.0.0
Thursday, Jun 27, 2024
====================================
- HarfBuzz now the supports the proposed new OpenType “VARC” table. This
replaces the previously supported “Variable Composites” experimental feature.
“VARC” support is still experimental and it is not enabled unless HarfBuzz is
built with experimental APIs enabled:
https://github.com/harfbuzz/boring-expansion-spec/blob/main/VARC.md
- Autotools build system have been dropped. Meson is the only supported build
system in HarfBuzz going forward.
- Speed up “AAT” shaping for short words by up to 4%.
- Ignore unknown “CFF” operators.
- “hb_subset_input_keep_everything()” now keeps also non-unicode “name” table
records.
- Update the IANA and OpenType language tag registries.
- Support composite glyphs with very large number of points in hb-draw API.
- Various build fixes.
Overview of changes leading to 8.5.0
Monday, May 13, 2024
====================================
- API for partial instancing is now stable and have been promoted out of
experimental APIs.
- Support instancing “BASE” table.
- Speedup AAT shaping by 13–30%.
- Various build fixes.
- Various subsetter and instancer fixes.
- New API:
+HB_SUBSET_FLAGS_OPTIMIZE_IUP_DELTAS
+hb_subset_input_get_axis_range()
+hb_subset_input_pin_axis_location()
Overview of changes leading to 8.4.0
Saturday, March 29, 2024
====================================
- Add /bigobj to MSVC compiler flags in meson build, to fix building hb-subset.cc
- Specify minimum versions of various dependencies in meson and autotools build.
- When subsetting, place variation store at the end of “GDEF” table to fix
shaping issues with some versions of Adobe InDesign.
- Various build fixes.
- New API:
+hb_buffer_set_random_state()
+hb_buffer_get_random_state()
Overview of changes leading to 8.3.1
Saturday, March 16, 2024
====================================
- hb_blob_create_from_file_or_fail() on Windows will now try to interpret the
file name as UTF-8 first, and as system code page if it is not valid UTF-8.
- Fix hb_style_get_value() in fonts with “STAT” table.
- Properly handle negative offsets in CFF table.
- Update IANA Language Subtag Registry to 2024-03-07.
- Subsetter now supports subsetting “BASE” table.
- Subsetter will update “hhea” font metrics in sync with “OS/2” ones.
- “--variations” option of “hb-subset” now supports leaving out values that
should be unchanged, e.g. “wght=:500:” will change the default and keep max
and min unchanged. It also supports “*=drop” to to pin all axes to default
location.
- Fix hb_ot_math_get_glyph_kerning() to match updated “MATH” table spec.
- Support legacy MacRoman encoding in “cmap” table.
- Various build fixes.
- Various subsetting and instancing fixes.
- New API:
hb_subset_input_pin_all_axes_to_default()
Overview of changes leading to 8.3.0
Saturday, November 11, 2023
====================================
- Improve memory barrier to fix potential segfaults.
- Various build fixes.
- Various subsetting and instancing fixes.
- Rename “hb-subset” option “--instance” to “--variations” to match the other
tools. Old option is kept as an alias.
- New API:
+HB_AAT_LAYOUT_FEATURE_TYPE_CURSIVE_CONNECTION
- Deprecated API:
+HB_AAT_LAYOUT_FEATURE_TYPE_CURISVE_CONNECTION
Overview of changes leading to 8.2.2
Wednesday, October 18, 2023
“From the river to the sea, Palestine will be free”
====================================
- Fix regression from 8.1.0 in shaping fonts with duplicate feature tags.
- Fix regression from 8.2.0 in parsing CSS-style feature strings.
- Variable fonts instanciation now handles more tables.
- Various CMake build improvements.
- various fixes to build without errors with gcc 4.9.2.
Overview of changes leading to 8.2.1
Monday, September 18, 2023
====================================
- Unicode 15.1 support.
Overview of changes leading to 8.2.0
Friday, September 8, 2023
====================================
- Various build and fuzzing fixes
- Improvements to COLRv1 painting.
- New API:
+hb_paint_color_glyph_func_t
+hb_paint_funcs_set_color_glyph_func
+hb_paint_color_glyph
Overview of changes leading to 8.1.1
Wednesday, August 2, 2023
====================================
- Fix shaping of contextual rules at the end of string, introduced in 8.1.0
- Fix stack-overflow in repacker with malicious fonts.
- 30% speed up loading Noto Duployan font.
Overview of changes leading to 8.1.0
Tuesday, August 1, 2023
====================================
- Fix long-standing build issue with the AIX compiler and older Apple clang.
- Revert optimization that could cause timeout during subsetting with malicious fonts.
- More optimization work:
- 45% speed up in shaping Noto Duployan font.
- 10% speed up in subsetting Noto Duployan font.
- Another 8% speed up in shaping Gulzar.
- 5% speed up in loading Roboto.
- New API:
+hb_ot_layout_collect_features_map()
Overview of changes leading to 8.0.1
Wednesday, July 12, 2023
====================================
- Build fix on 32-bit ARM.
- More speed optimizations:
- 60% speed up in retain-gid (used for IFT) subsetting of SourceHanSans-VF.
- 16% speed up in retain-gid (used for IFT) subsetting of NotoSansCJKkr.
- 38% speed up in subsetting (beyond-64k) mega-merged Noto.
Overview of changes leading to 8.0.0
Sunday, July 9, 2023
====================================
- New, experimental, WebAssembly (WASM) shaper, that provides greater
flexibility over OpenType/AAT/Graphite shaping, using WebAssembly embedded
inside the font file. Currently WASM shaper is disabled by default and needs
to be enabled at build time. For details, see:
https://github.com/harfbuzz/harfbuzz/blob/main/docs/wasm-shaper.md
For example fonts making use of the WASM shaper, see:
https://github.com/harfbuzz/harfbuzz-wasm-examples
- Improvements to Experimental features introduced in earlier releases:
- Support for subsetting beyond-64k and VarComposites fonts.
- Support for instancing variable fonts with cubic “glyf” table.
- Many big speed optimizations:
- Up to 89% speedup loading variable fonts for shaping.
- Up to 88% speedup in small subsets of large (eg. CJK) fonts (both TTF and
OTF), essential for Incremental Font Transfer (IFT).
- Over 50% speedup in loading Roboto font for shaping.
- Up to 40% speed up in loading (sanitizing) complex fonts.
- 30% speed up in shaping Gulzar font.
- Over 25% speedup in glyph loading Roboto font.
- 10% speed up loading glyph shapes in VarComposite Hangul font.
- hb-hashmap optimizations & hashing improvements.
- New macro HB_ALWAYS_INLINE. HarfBuzz now inlines functions more aggressively,
which results in some speedup at the expense of bigger code size. To disable
this feature define the macro to just inline.
- New API:
+HB_CODEPOINT_INVALID
+hb_ot_layout_get_baseline2()
+hb_ot_layout_get_baseline_with_fallback2()
+hb_ot_layout_get_font_extents()
+hb_ot_layout_get_font_extents2()
+hb_subset_input_set_axis_range()
Overview of changes leading to 7.3.0
Tuesday, May 9, 2023
====================================
- Speedup applying glyph variation in VarComposites fonts (over 40% speedup).
(Behdad Esfahbod)
- Speedup instancing some fonts (over 20% speedup in instancing RobotoFlex).
(Behdad Esfahbod)
- Speedup shaping some fonts (over 30% speedup in shaping Roboto).
(Behdad Esfahbod)
- Support subsetting VarComposites and beyond-64k fonts. (Behdad Esfahbod)
- New configuration macro HB_MINIMIZE_MEMORY_USAGE to favor optimizing memory
usage over speed. (Behdad Esfahbod)
- Supporting setting the mapping between old and new glyph indices during
subsetting. (Garret Rieger)
- Various fixes and improvements.
(Behdad Esfahbod, Denis Rochette, Garret Rieger, Han Seung Min, Qunxin Liu)
- New API:
+hb_subset_input_old_to_new_glyph_mapping()
Overview of changes leading to 7.2.0
Thursday, April 27, 2023
====================================
- Add Tifinagh to the list of scripts that can natively be either right-to-left
or left-to-right, to improve handling of its glyph positioning.
(Simon Cozens)
- Return also single substitution from hb_ot_layout_lookup_get_glyph_alternates()
(Behdad Esfahbod)
- Fix 4.2.0 regression in applying across syllables in syllabic scripts.
(Behdad Esfahbod)
- Add flag to avoid glyph substitution closure during subsetting, and the
corresponding “--no-layout-closure” option to “hb-subset” command line tool.
(Garret Rieger)
- Support instancing COLRv1 table. (Qunxin Liu)
- Don’t drop used user-defined name table entries during subsetting.
(Qunxin Liu)
- Optimize handling of “gvar” table. (Behdad Esfahbod)
- Various subsetter bug fixes and improvements. (Garret Rieger, Qunxin Liu)
- Various documentation improvements. (Behdad Esfahbod, Josef Friedrich)
- New API:
+HB_SUBSET_FLAGS_NO_LAYOUT_CLOSURE
+HB_UNICODE_COMBINING_CLASS_CCC132
- Deprecated API:
+HB_UNICODE_COMBINING_CLASS_CCC133
Overview of changes leading to 7.1.0
Friday, March 3, 2023
====================================
- New experimental hb_shape_justify() API that uses font variations to expand
or shrink the text to a given advance. (Behdad Esfahbod)
- Various build and bug fixes. (Behdad Esfahbod, Garret Rieger, Qunxin Liu)
- New API:
+hb_font_set_variation()
Overview of changes leading to 7.0.1
Monday, February 20, 2023
====================================
- Various build and bug fixes.
Overview of changes leading to 7.0.0
Saturday, February 11, 2023
====================================
- New hb-paint API that is designed mainly to paint “COLRv1” glyphs, but can be
also used as a unified API to paint any of the glyph representations
supported by HarfBuzz (B/W outlines, color layers, or color bitmaps).
(Behdad Esfahbod, Matthias Clasen)
- New hb-cairo API for integrating with cairo graphics library. This is provided
as a separate harfbuzz-cairo library. (Behdad Esfahbod, Matthias Clasen)
- Support for instancing “CFF2” table. (Behdad Esfahbod)
- Support font emboldening. (Behdad Esfahbod)
- Support feature ranges with AAT shaping. (Behdad Esfahbod)
- Experimental support to cubic curves in “glyf” table, see
https://github.com/harfbuzz/boring-expansion-spec/blob/main/glyf1-cubicOutlines.md
for spec. (Behdad Esfahbod)
- Various subsetter improvements. (Garret Rieger, Qunxin Liu, Behdad Esfahbod)
- Various documentation improvements.
(Behdad Esfahbod, Matthias Clasen, Khaled Hosny)
- Significantly reduced memory use during shaping. (Behdad Esfahbod)
- Greatly reduced memory use during subsetting “CFF” table. (Behdad Esfahbod)
- New command line utility, hb-info, for querying various font information.
(Behdad Esfahbod, Matthias Clasen)
- New hb-shape/hb-view options: --glyphs, --color-palette, --font-bold,
--font-grade, and --named-instance. (Behdad Esfahbod)
- Miscellaneous fixes and improvements.
(Amir Masoud Abdol, Andres Salomon, Behdad Esfahbod, Chun-wei Fan,
Garret Rieger, Jens Kutilek, Khaled Hosny, Konstantin Käfer, Matthias Clasen,
Nirbheek Chauhan, Pedro J. Estébanez, Qunxin Liu, Sergei Trofimovich)
- New API:
+HB_FONT_NO_VAR_NAMED_INSTANCE
+HB_PAINT_IMAGE_FORMAT_BGRA
+HB_PAINT_IMAGE_FORMAT_PNG
+HB_PAINT_IMAGE_FORMAT_SVG
+hb_cairo_font_face_create_for_face
+hb_cairo_font_face_create_for_font
+hb_cairo_font_face_get_face
+hb_cairo_font_face_get_font
+hb_cairo_font_face_get_scale_factor
+hb_cairo_font_face_set_font_init_func
+hb_cairo_font_face_set_scale_factor
+hb_cairo_font_init_func_t
+hb_cairo_glyphs_from_buffer
+hb_cairo_scaled_font_get_font
+hb_color_line_get_color_stops
+hb_color_line_get_color_stops_func_t
+hb_color_line_get_extend
+hb_color_line_get_extend_func_t
+hb_color_line_t
+hb_color_stop_t
+hb_draw_funcs_get_empty
+hb_draw_funcs_get_user_data
+hb_draw_funcs_set_user_data
+hb_face_collect_nominal_glyph_mapping
+hb_font_draw_glyph
+hb_font_draw_glyph_func_t
+hb_font_funcs_set_draw_glyph_func
+hb_font_funcs_set_paint_glyph_func
+hb_font_get_synthetic_bold
+hb_font_get_var_named_instance
+hb_font_paint_glyph
+hb_font_paint_glyph_func_t
+hb_font_set_synthetic_bold
+hb_map_keys
+hb_map_next
+hb_map_update
+hb_map_values
+hb_ot_color_glyph_has_paint
+hb_ot_color_has_paint
+hb_ot_layout_script_select_language2
+hb_ot_name_id_predefined_t
+hb_paint_color
+hb_paint_color_func_t
+hb_paint_composite_mode_t
+hb_paint_custom_palette_color
+hb_paint_custom_palette_color_func_t
+hb_paint_extend_t
+hb_paint_funcs_create
+hb_paint_funcs_destroy
+hb_paint_funcs_get_empty
+hb_paint_funcs_get_user_data
+hb_paint_funcs_is_immutable
+hb_paint_funcs_make_immutable
+hb_paint_funcs_reference
+hb_paint_funcs_set_color_func
+hb_paint_funcs_set_custom_palette_color_func
+hb_paint_funcs_set_image_func
+hb_paint_funcs_set_linear_gradient_func
+hb_paint_funcs_set_pop_clip_func
+hb_paint_funcs_set_pop_group_func
+hb_paint_funcs_set_pop_transform_func
+hb_paint_funcs_set_push_clip_glyph_func
+hb_paint_funcs_set_push_clip_rectangle_func
+hb_paint_funcs_set_push_group_func
+hb_paint_funcs_set_push_transform_func
+hb_paint_funcs_set_radial_gradient_func
+hb_paint_funcs_set_sweep_gradient_func
+hb_paint_funcs_set_user_data
+hb_paint_funcs_t
+hb_paint_image
+hb_paint_image_func_t
+hb_paint_linear_gradient
+hb_paint_linear_gradient_func_t
+hb_paint_pop_clip
+hb_paint_pop_clip_func_t
+hb_paint_pop_group
+hb_paint_pop_group_func_t
+hb_paint_pop_transform
+hb_paint_pop_transform_func_t
+hb_paint_push_clip_glyph
+hb_paint_push_clip_glyph_func_t
+hb_paint_push_clip_rectangle
+hb_paint_push_clip_rectangle_func_t
+hb_paint_push_group
+hb_paint_push_group_func_t
+hb_paint_push_transform
+hb_paint_push_transform_func_t
+hb_paint_radial_gradient
+hb_paint_radial_gradient_func_t
+hb_paint_sweep_gradient
+hb_paint_sweep_gradient_func_t
+hb_set_is_inverted
+hb_subset_input_keep_everything
- Deprecated API:
+hb_font_funcs_set_glyph_shape_func
+hb_font_get_glyph_shape_func_t
+hb_font_get_glyph_shape
Overview of changes leading to 6.0.0
Friday, December 16, 2022
====================================
- A new API have been added to pre-process the face and speed up future
subsetting operations on that face. Provides up to a 95% reduction in
subsetting times when the same face is subset more than once.
For more details and benchmarks, see:
https://github.com/harfbuzz/harfbuzz/blob/main/docs/subset-preprocessing.md
(Garret Rieger, Behdad Esfahbod)
- Shaping have been speedup by skipping entire lookups when the buffer contents
don't intersect with the lookup. Shows up to a 10% speedup in shaping some
fonts. (Behdad Esfahbod)
- A new experimental feature, “Variable Composites” (enabled by passing
-Dexperimental_api=true to meson), is also featured in this release.
This technology enables drastic compression of fonts in the Chinese,
Japanese, Korean, and other writing systems, by reusing the OpenType Font
Variations technology for encoding “smart components” into the font.
The specification for these extensions to the font format can be found in:
https://github.com/harfbuzz/boring-expansion-spec/blob/glyf1/glyf1.md
A test variable-font with ~7160 Hangul syllables derived from the
NotoSerifKR-VF font has been built, with existing OpenType technology, as
well as with the new Variable Composites (VarComposites) technology. The
VarComposites font is over 90% smaller than the OpenType version of the font!
Both fonts can be obtained from the “smarties” repository:
https://github.com/behdad/smarties/tree/3.0/fonts/hangul/serif
When building HarfBuzz with experimental features enabled, you can test
the “smarties” font with a sample character like this:
$ hb-view butchered-hangul-serif-smarties-variable.ttf -u AE01 --variations=wght=700
(Behdad Esfahbod)
- The HarfBuzz subsetter can now drop axes by pinning them to specific values
(also referred to as instancing). There are a couple of restrictions
currently:
- Only works with TrueType (“glyf”) based fonts. “CFF2” fonts are not yet
supported.
- Only supports the case where all axes in a font are pinned.
(Garret Rieger, Qunxin Liu)
- Miscellaneous fixes and improvements.
(Behdad Esfahbod, Christoph Reiter, David Corbett, Eli Schwartz, Garret
Rieger, Joel Auterson, Jordan Petridis, Khaled Hosny, Lorenz Wildberg,
Marco Rebhan, Martin Storsjö, Matthias Clasen, Qunxin Liu, Satadru Pramanik)
- New API
+hb_subset_input_pin_axis_location()
+hb_subset_input_pin_axis_to_default()
+hb_subset_preprocess()
Overview of changes leading to 5.3.1
Wednesday, October 19, 2022
====================================
- Subsetter repacker fixes. (Garret Rieger)
- Adjust Grapheme clusters for Katakana voiced sound marks. (Behdad Esfahbod)
- New “hb-subset” option “--preprocess-face”. (Garret Rieger)
Overview of changes leading to 5.3.0
Saturday, October 8, 2022
"Women, Life, Freedom" #MahsaAmini
====================================
- Don’t add glyphs from dropped MATH or COLR tables to the subset glyphs.
(Khaled Hosny)
- Map “rlig” to appropriate AAT feature selectors. (Jonathan Kew)
- Update USE data files to latest version. (David Corbett)
- Check “CBDT” extents first before outline tables, to help with fonts that
also include an empty “glyf” table. (Khaled Hosny)
- More work towards variable font instancing in the subsetter. (Qunxin Liu)
- Subsetter repacker improvements. (Garret Rieger)
- New API:
+hb_ot_layout_lookup_get_optical_bound()
+hb_face_builder_sort_tables()
Overview of changes leading to 5.2.0
Saturday, September 17, 2022
====================================
- Fix regressions in hb-ft font functions for FT_Face’s with transformation
matrix. (Behdad Esfahbod)
- The experimental hb-repacker API now supports splitting several GPOS subtable
types when needed. (Garret Rieger)
- The HarfBuzz extensions to OpenType font format are now opt-in behind
build-time flags. (Behdad Esfahbod)
- The experimental hb-subset variable fonts instantiation API can now
instantiate more font tables and arbitrary axis locations. (Qunxin Liu)
- Unicode 15 support. (David Corbett)
- Various documentation improvements. (Behdad Esfahbod, Matthias Clasen)
- The hb-view command line tool now detects WezTerm inline images support.
(Wez Furlong)
- Fix FreeType and ICU dependency lookup with meson. (Xavier Claessens)
- New API:
+HB_SCRIPT_KAWI
+HB_SCRIPT_NAG_MUNDARI
Overview of changes leading to 5.1.0
Sunday, July 31, 2022
====================================
- More extensive buffer tracing messages. (Behdad Esfahbod)
- Fix hb-ft regression in bitmap fonts rendering. (Behdad Esfahbod)
- Support extension promotion of lookups in hb-subset-repacker. (Garret Rieger)
- A new HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL for scripts that use elongation
(e.g. Arabic) to signify where it is safe to insert tatweel glyph without
interrupting shaping. (Behdad Esfahbod)
- Add “--safe-to-insert-tatweel” to “hb-shape” tool. (Behdad Esfahbod)
- New API
+HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL
+HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL
Overview of changes leading to 5.0.1
Saturday, July 23, 2022
====================================
- Fix version 2 “avar” table with hb-ft. (Behdad Esfahbod)
Overview of changes leading to 5.0.0
Saturday, July 23, 2022
====================================
- Support fonts with more than 65535 glyphs in “GDEF”, “GSUB”, and “GPOS”
tables. This is part of https://github.com/be-fonts/boring-expansion-spec to
extend OpenType in a backward-compatible way.
(Behdad Esfahbod, Garret Rieger)
- 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.
- 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()
Overview of changes leading to 4.4.1
Wednesday, June 29, 2022
====================================
- Fix test failure with some compilers.
- Fix Telugu and Kannada kerning regression.
Overview of changes leading to 4.4.0
Monday, June 27, 2022
====================================
- 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()
Overview of changes leading to 4.3.0
Friday, May 20, 2022
====================================
- 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)
Overview of changes leading to 4.2.1
Sunday, April 24, 2022
====================================
- Make sure hb_blob_create_from_file_or_fail() always returns nullptr in case
of failure and not empty blob sometimes. (Khaled Hosny)
- Add --passthrough-tables option to hb-subset. (Cosimo Lupo)
- Reinstate a pause after basic features in Khmer shaper, fixing a regression
introduced in previous release. (Behdad Esfahbod)
- Better handling of Regional_Indicator when shaped with RTL-native scripts,
reverting earlier fix that caused regressions in AAT shaping. (Behdad Esfahbod)
Overview of changes leading to 4.2.0
Wednesday, March 30, 2022
====================================
- 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)
Overview of changes leading to 4.1.0
Wednesday, March 23, 2022
====================================
- 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)
Overview of changes leading to 4.0.1
Friday, March 11, 2022
====================================
- 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()
Overview of changes leading to 4.0.0
Tuesday, March 1, 2022
====================================
- 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()
Overview of changes leading to 3.4.0
Sunday, February 13, 2022
====================================
- Perform sanity checks on shaping results is now part of “harfbuzz” library
and can be enabled by setting the buffer flag HB_BUFFER_FLAG_VERIFY.
(Behdad Esfahbod)
- Arabic Mark Transient Reordering Algorithm have been updated to revision 6.
(Khaled Hosny)
- ISO 15924 code for mathematical notation, ‘Zmth’, now maps to the OpenType
‘math’ tag. (Alexis King)
- It is now possible to get at once all math kerning values for a given glyph
at a given corner. (Alexis King)
- Fix locale_t portability issues on systems the typedef’s it to a void
pointer. (Behdad Esfahbod)
- New API:
+HB_BUFFER_FLAG_VERIFY
+HB_OT_TAG_MATH_SCRIPT
+HB_SCRIPT_MATH
+hb_ot_math_kern_entry_t
+hb_ot_math_get_glyph_kernings()
- Deprecated API
+HB_OT_MATH_SCRIPT
Overview of changes leading to 3.3.2
Sunday, February 6, 2022
====================================
- Revert splitting of pair positioning values introduced in 3.3.0 as it proved
problematic. (Behdad Esfahbod)
Overview of changes leading to 3.3.1
Monday, January 31, 2022
====================================
- Fix heap-use-after-free in harfbuzz-subset introduced in previous release.
(Garret Rieger)
Overview of changes leading to 3.3.0
Monday, January 31, 2022
====================================
- Improved documentation. (Matthias Clasen)
- Internal code cleanup, using C++ standard library more. (Behdad Esfahbod)
- The low 16-bits of face index will be used by hb_face_create() to select a
face inside a font collection file format, while the high 16-bits will be
used by hb_font_create() to load the named instance. (Behdad Esfahbod)
- Glyph positions and other font metrics now apply synthetic slant set by
hb_font_set_synthetic_slant(), for improved positioning for synthetically
slanted fonts. (Behdad Esfahbod)
- Fixed unintentional locale dependency in hb_variation_to_string() for decimal
point representation. (Matthias Clasen)
- When applying pair positioning (kerning) the positioning value is split
between the two sides of the pair for improved cursor positioning between
such pairs. (Behdad Esfahbod)
- Introduced new HB_GLYPH_FLAG_UNSAFE_TO_CONCAT, to be used in conjunction
with HB_GLYPH_FLAG_UNSAFE_TO_BREAK for optimizing re-shaping during line
breaking. Check the documentation for further details. (Behdad Esfahbod)