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HarfBuzz text shaping engine http://harfbuzz.github.io/
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harfbuzz/NEWS

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Overview of changes leading to 0.9.19
Tuesday, July 16, 2013
=====================================
- Build fixes.
- Better handling of multiple variation selectors in a row.
- Pass on variation selector to GSUB if not consumed by cmap.
- Fix undefined memory access.
- Add Javanese config to Indic shaper.
- Misc bug fixes.
Overview of changes leading to 0.9.18
Tuesday, May 28, 2013
=====================================
New build system:
- All unneeded code is all disabled by default,
- Uniscribe and CoreText shapers can be enabled with their --with options,
- icu_le and old shapers cannot be enabled for now,
- glib, freetype, and cairo will be detected automatically.
They can be force on/off'ed with their --with options,
- icu and graphite2 are default off, can be enabled with their --with
options,
Moreover, ICU support is now build into a separate library:
libharfbuzz-icu.so, and a new harfbuzz-icu.pc is shipped for it.
Distros can enable ICU now without every application on earth
getting linked to via libharfbuzz.so.
For distros I recommend that they make sure they are building --with-glib
--with-freetype --with-cairo, --with-icu, and optionally --with-graphite2;
And package harfbuzz and harfbuzz-icu separately.
Overview of changes leading to 0.9.17
Monday, May 20, 2013
=====================================
- Build fixes.
- Fix bug in hb_set_get_min().
- Fix regression with Arabic mark positioning / width-zeroing.
Overview of changes leading to 0.9.16
Friday, April 19, 2013
=====================================
- Major speedup in OpenType lookup processing. With the Amiri
Arabic font, this release is over 3x faster than previous
release. All scripts / languages should see this speedup.
- New --num-iterations option for hb-shape / hb-view; useful for
profiling.
Overview of changes leading to 0.9.15
Friday, April 05, 2013
=====================================
- Build fixes.
- Fix crasher in graphite2 shaper.
- Fix Arabic mark width zeroing regression.
- Don't compose Hangul jamo into Unicode syllables.
Overview of changes leading to 0.9.14
Thursday, March 21, 2013
=====================================
- Build fixes.
- Fix time-consuming sanitize with malicious fonts.
- Implement hb_buffer_deserialize_glyphs() for both json and text.
- Do not ignore Hangul filler characters.
- Indic fixes:
* Fix Malayalam pre-base reordering interaction with post-forms.
* Further adjust ZWJ handling. Should fix known regressions from
0.9.13.
Overview of changes leading to 0.9.13
Thursday, February 25, 2013
=====================================
- Build fixes.
- Ngapi HarfBuzz Hackfest in London (February 2013):
* Fixed all known Indic bugs,
* New Win8-style Myanmar shaper,
* New South-East Asian shaper for Tai Tham, Cham, and New Tai Lue,
* Smartly ignore Default_Ignorable characters (joiners, etc) wheb
matching GSUB/GPOS lookups,
* Fix 'Phags-Pa U+A872 shaping,
* Fix partial disabling of default-on features,
* Allow disabling of TrueType kerning.
- Fix possible crasher with broken fonts with overlapping tables.
- Removed generated files from git again. So, one needs ragel to
bootstrap from the git tree.
API changes:
- hb_shape() and related APIs now abort if buffer direction is
HB_DIRECTION_INVALID. Previously, hb_shape() was calling
hb_buffer_guess_segment_properties() on the buffer before
shaping. The heuristics in that function are fragile. If the
user really wants the old behvaior, they can call that function
right before calling hb_shape() to get the old behavior.
- hb_blob_create_sub_blob() always creates sub-blob with
HB_MEMORY_MODE_READONLY. See comments for the reason.
Overview of changes leading to 0.9.12
Thursday, January 18, 2013
=====================================
- Build fixes for Sun compiler.
- Minor bug fix.
Overview of changes leading to 0.9.11
Thursday, January 10, 2013
=====================================
- Build fixes.
- Fix GPOS mark attachment with null Anchor offsets.
- [Indic] Fix old-spec reordering of viramas if sequence ends in one.
- Fix multi-threaded shaper data creation crash.
- Add atomic ops for Solaris.
API changes:
- Rename hb_buffer_clear() to hb_buffer_clear_contents().
Overview of changes leading to 0.9.10
Thursday, January 3, 2013
=====================================
- [Indic] Fixed rendering of Malayalam dot-reph
- Updated OT language tags.
- Updated graphite2 backend.
- Improved hb_ot_layout_get_size_params() logic.
- Improve hb-shape/hb-view help output.
- Fixed hb-set.h implementation to not crash.
- Fixed various issues with hb_ot_layout_collect_lookups().
- Various build fixes.
New API:
hb_graphite2_face_get_gr_face()
hb_graphite2_font_get_gr_font()
hb_coretext_face_get_cg_font()
Modified API:
hb_ot_layout_get_size_params()
Overview of changes leading to 0.9.9
Wednesday, December 5, 2012
====================================
- Fix build on Windows.
- Minor improvements.
Overview of changes leading to 0.9.8
Tuesday, December 4, 2012
====================================
- Actually implement hb_shape_plan_get_shaper ().
- Make UCDB data tables const.
- Lots of internal refactoring in OTLayout tables.
- Flesh out hb_ot_layout_lookup_collect_glyphs().
New API:
hb_ot_layout_collect_lookups()
hb_ot_layout_get_size_params()
Overview of changes leading to 0.9.7
Sunday, November 21, 2012
====================================
HarfBuzz "All-You-Can-Eat-Sushi" (aka Vancouver) Hackfest and follow-on fixes.
- Fix Arabic contextual joining using pre-context text.
- Fix Sinhala "split matra" mess.
- Fix Khmer shaping with broken fonts.
- Implement Thai "PUA" shaping for old fonts.
- Do NOT route Kharoshthi script through the Indic shaper.
- Disable fallback positioning for Indic and Thai shapers.
- Misc fixes.
hb-shape / hb-view changes:
- Add --text-before and --text-after
- Add --bot / --eot / --preserve-default-ignorables
- hb-shape --output-format=json
New API:
hb_buffer_clear()
hb_buffer_flags_t
HB_BUFFER_FLAGS_DEFAULT
HB_BUFFER_FLAG_BOT
HB_BUFFER_FLAG_EOT
HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES
hb_buffer_set_flags()
hb_buffer_get_flags()
HB_BUFFER_SERIALIZE_FLAGS
hb_buffer_serialize_glyphs()
hb_buffer_deserialize_glyphs()
hb_buffer_serialize_list_formats()
hb_set_add_range()
hb_set_del_range()
hb_set_get_population()
hb_set_next_range()
hb_face_[sg]et_glyph_count()
hb_segment_properties_t
HB_SEGMENT_PROPERTIES_DEFAULT
hb_segment_properties_equal()
hb_segment_properties_hash()
hb_buffer_set_segment_properties()
hb_buffer_get_segment_properties()
hb_ot_layout_glyph_class_t
hb_ot_layout_get_glyph_class()
hb_ot_layout_get_glyphs_in_class()
hb_shape_plan_t
hb_shape_plan_create()
hb_shape_plan_create_cached()
hb_shape_plan_get_empty()
hb_shape_plan_reference()
hb_shape_plan_destroy()
hb_shape_plan_set_user_data()
hb_shape_plan_get_user_data()
hb_shape_plan_execute()
hb_shape_plan_get_shaper()
hb_ot_shape_plan_collect_lookups()
API changes:
- Remove "mask" parameter from hb_buffer_add().
- Rename hb_ot_layout_would_substitute_lookup() and hb_ot_layout_substitute_closure_lookup().
- hb-set.h API const correction.
- Renamed hb_set_min/max() to hb_set_get_min/max().
- Rename hb_ot_layout_feature_get_lookup_indexes() to hb_ot_layout_feature_get_lookups().
- Rename hb_buffer_guess_properties() to hb_buffer_guess_segment_properties().
Overview of changes leading to 0.9.6
Sunday, November 13, 2012
====================================
- Don't clear pre-context text if no new context is provided.
- Fix ReverseChainingSubstLookup, which was totally borked.
- Adjust output format of hb-shape a bit.
- Include config.h.in in-tree. Makes it easier for alternate build systems.
- Fix hb_buffer_set_length(buffer, 0) invalid memory allocation.
- Use ICU LayoutEngine's C API instead of C++. Avoids much headache.
- Drop glyphs for all of Unicode Default_Ignorable characters.
- Misc build fixes.
Arabic shaper:
- Enable 'dlig' and 'mset' features in Arabic shaper.
- Implement 'Phags-pa shaping, improve Mongolian.
Indic shaper:
- Decompose Sinhala split matras the way old HarfBuzz / Pango did.
- Initial support for Consonant Medials.
- Start adding new-style Myanmar shaping.
- Make reph and 'pref' logic introspect the font.
- Route Meetei-Mayek through the Indic shaper.
- Don't apply 'liga' in Indic shaper.
- Improve Malayalam pre-base reordering Ra interaction with Chillus.
Overview of changes leading to 0.9.5
Sunday, October 14, 2012
====================================
- Synthetic-GSUB Arabic fallback shaping.
- Misc Indic improvements.
- Add build system support for pthread.
- Imported UCDN for in-tree Unicode callbacks implementation.
- Context-aware Arabic joining.
- Misc other fixes.
- New API:
hb_feature_to/from-string()
hb_buffer_[sg]et_content_type()
Overview of changes leading to 0.9.4
Tuesday, Sep 03, 2012
====================================
- Indic improvements with old-spec Malayalam.
- Better fallback glyph positioning, specially with Thai / Lao marks.
- Implement dotted-circle insertion.
- Better Arabic fallback shaping / ligation.
- Added ICU LayoutEngine backend for testing. Call it by the 'icu_le' name.
- Misc fixes.
Overview of changes leading to 0.9.3
Friday, Aug 18, 2012
====================================
- Fixed fallback mark positioning for left-to-right text.
- Improve mark positioning for the remaining combining classes.
- Unbreak Thai and fallback Arabic shaping.
- Port Arabic shaper to shape-plan caching.
- Use new ICU normalizer functions.
Overview of changes leading to 0.9.2
Friday, Aug 10, 2012
====================================
- Over a thousand commits! This is the first major release of HarfBuzz.
- HarfBuzz is feature-complete now! It should be in par, or better, than
both Pango's shapers and old HarfBuzz / Qt shapers.
- New Indic shaper, supporting main Indic scripts, Sinhala, and Khmer.
- Improved Arabic shaper, with fallback Arabic shaping, supporting Arabic,
Sinhala, N'ko, Mongolian, and Mandaic.
- New Thai / Lao shaper.
- Tibetan / Hangul support in the generic shaper.
- Synthetic GDEF support for fonts without a GDEF table.
- Fallback mark positioning for fonts without a GPOS table.
- Unicode normalization shaping heuristic during glyph mapping.
- New experimental Graphite2 backend.
- New Uniscribe backend (primarily for testing).
- New CoreText backend (primarily for testing).
- Major optimization and speedup.
- Test suites and testing infrastructure (work in progress).
- Greatly improved hb-view cmdline tool.
- hb-shape cmdline tool.
- Unicode 6.1 support.
Summary of API changes:
o Changed API:
- Users are expected to only include main header files now (ie. hb.h,
hb-glib.h, hb-ft.h, ...)
- All struct tag names had their initial underscore removed.
Ie. "struct _hb_buffer_t" is "struct hb_buffer_t" now.
- All set_user_data() functions now take a "replace" boolean parameter.
- hb_buffer_create() takes zero arguments now.
Use hb_buffer_pre_allocate() to pre-allocate.
- hb_buffer_add_utf*() now accept -1 for length parameteres,
meaning "nul-terminated".
- hb_direction_t enum values changed.
- All *_from_string() APIs now take a length parameter to allow for
non-nul-terminated strings. A -1 length means "nul-terminated".
- Typedef for hb_language_t changed.
- hb_get_table_func_t renamed to hb_reference_table_func_t.
- hb_ot_layout_table_choose_script()
- Various renames in hb-unicode.h.
o New API:
- hb_buffer_guess_properties()
Automatically called by hb_shape().
- hb_buffer_normalize_glyphs()
- hb_tag_from_string()
- hb-coretext.h
- hb-uniscribe.h
- hb_face_reference_blob()
- hb_face_[sg]et_index()
- hb_face_set_upem()
- hb_font_get_glyph_name_func_t
hb_font_get_glyph_from_name_func_t
hb_font_funcs_set_glyph_name_func()
hb_font_funcs_set_glyph_from_name_func()
hb_font_get_glyph_name()
hb_font_get_glyph_from_name()
hb_font_glyph_to_string()
hb_font_glyph_from_string()
- hb_font_set_funcs_data()
- hb_ft_font_set_funcs()
- hb_ft_font_get_face()
- hb-gobject.h (work in progress)
- hb_ot_shape_glyphs_closure()
hb_ot_layout_substitute_closure_lookup()
- hb-set.h
- hb_shape_full()
- hb_unicode_combining_class_t
- hb_unicode_compose_func_t
hb_unicode_decompose_func_t
hb_unicode_decompose_compatibility_func_t
hb_unicode_funcs_set_compose_func()
hb_unicode_funcs_set_decompose_func()
hb_unicode_funcs_set_decompose_compatibility_func()
hb_unicode_compose()
hb_unicode_decompose()
hb_unicode_decompose_compatibility()
o Removed API:
- hb_ft_get_font_funcs()
- hb_ot_layout_substitute_start()
hb_ot_layout_substitute_lookup()
hb_ot_layout_substitute_finish()
hb_ot_layout_position_start()
hb_ot_layout_position_lookup()
hb_ot_layout_position_finish()
Overview of changes leading to 0.6.0
Friday, May 27, 2011
====================================
- Vertical text support in GPOS
- Almost all API entries have unit tests now, under test/
- All thread-safety issues are fixed
Summary of API changes follows.
* Simple Types API:
o New API:
HB_LANGUAGE_INVALID
hb_language_get_default()
hb_direction_to_string()
hb_direction_from_string()
hb_script_get_horizontal_direction()
HB_UNTAG()
o Renamed API:
hb_category_t renamed to hb_unicode_general_category_t
o Changed API:
hb_language_t is a typed pointers now
o Removed API:
HB_TAG_STR()
* Use ISO 15924 tags for hb_script_t:
o New API:
hb_script_from_iso15924_tag()
hb_script_to_iso15924_tag()
hb_script_from_string()
o Changed API:
HB_SCRIPT_* enum members changed value.
* Buffer API streamlined:
o New API:
hb_buffer_reset()
hb_buffer_set_length()
hb_buffer_allocation_successful()
o Renamed API:
hb_buffer_ensure() renamed to hb_buffer_pre_allocate()
hb_buffer_add_glyph() renamed to hb_buffer_add()
o Removed API:
hb_buffer_clear()
hb_buffer_clear_positions()
o Changed API:
hb_buffer_get_glyph_infos() takes an out length parameter now
hb_buffer_get_glyph_positions() takes an out length parameter now
* Blob API streamlined:
o New API:
hb_blob_get_data()
hb_blob_get_data_writable()
o Renamed API:
hb_blob_create_empty() renamed to hb_blob_get_empty()
o Removed API:
hb_blob_lock()
hb_blob_unlock()
hb_blob_is_writable()
hb_blob_try_writable()
o Changed API:
hb_blob_create() takes user_data before destroy now
* Unicode functions API:
o Unicode function vectors can subclass other unicode function vectors now.
Unimplemented callbacks in the subclass automatically chainup to the parent.
o All hb_unicode_funcs_t callbacks take a user_data now. Their setters
take a user_data and its respective destroy callback.
o New API:
hb_unicode_funcs_get_empty()
hb_unicode_funcs_get_default()
hb_unicode_funcs_get_parent()
o Changed API:
hb_unicode_funcs_create() now takes a parent_funcs.
o Removed func getter functions:
hb_unicode_funcs_get_mirroring_func()
hb_unicode_funcs_get_general_category_func()
hb_unicode_funcs_get_script_func()
hb_unicode_funcs_get_combining_class_func()
hb_unicode_funcs_get_eastasian_width_func()
* Face API:
o Renamed API:
hb_face_get_table() renamed to hb_face_reference_table()
hb_face_create_for_data() renamed to hb_face_create()
o Changed API:
hb_face_create_for_tables() takes user_data before destroy now
hb_face_reference_table() returns empty blob instead of NULL
hb_get_table_func_t accepts the face as first parameter now
* Font API:
o Fonts can subclass other fonts now. Unimplemented callbacks in the
subclass automatically chainup to the parent. When chaining up,
scale is adjusted if the parent font has a different scale.
o All hb_font_funcs_t callbacks take a user_data now. Their setters
take a user_data and its respective destroy callback.
o New API:
hb_font_get_parent()
hb_font_funcs_get_empty()
hb_font_create_sub_font()
o Removed API:
hb_font_funcs_copy()
hb_font_unset_funcs()
o Removed func getter functions:
hb_font_funcs_get_glyph_func()
hb_font_funcs_get_glyph_advance_func()
hb_font_funcs_get_glyph_extents_func()
hb_font_funcs_get_contour_point_func()
hb_font_funcs_get_kerning_func()
o Changed API:
hb_font_create() takes a face and references it now
hb_font_set_funcs() takes user_data before destroy now
hb_font_set_scale() accepts signed integers now
hb_font_get_contour_point_func_t now takes glyph first, then point_index
hb_font_get_glyph_func_t returns a success boolean now
* Changed object model:
o All object types have a _get_empty() now:
hb_blob_get_empty()
hb_buffer_get_empty()
hb_face_get_empty()
hb_font_get_empty()
hb_font_funcs_get_empty()
hb_unicode_funcs_get_empty()
o Added _set_user_data() and _get_user_data() for all object types:
hb_blob_get_user_data()
hb_blob_set_user_data()
hb_buffer_get_user_data()
hb_buffer_set_user_data()
hb_face_get_user_data()
hb_face_set_user_data()
hb_font_funcs_get_user_data()
hb_font_funcs_set_user_data()
hb_font_get_user_data()
hb_font_set_user_data()
hb_unicode_funcs_get_user_data()
hb_unicode_funcs_set_user_data()
o Removed the _get_reference_count() from all object types:
hb_blob_get_reference_count()
hb_buffer_get_reference_count()
hb_face_get_reference_count()
hb_font_funcs_get_reference_count()
hb_font_get_reference_count()
hb_unicode_funcs_get_reference_count()
o Added _make_immutable() and _is_immutable() for all object types except for buffer:
hb_blob_make_immutable()
hb_blob_is_immutable()
hb_face_make_immutable()
hb_face_is_immutable()
* Changed API for vertical text support
o The following callbacks where removed:
hb_font_get_glyph_advance_func_t
hb_font_get_kerning_func_t
o The following new callbacks added instead:
hb_font_get_glyph_h_advance_func_t
hb_font_get_glyph_v_advance_func_t
hb_font_get_glyph_h_origin_func_t
hb_font_get_glyph_v_origin_func_t
hb_font_get_glyph_h_kerning_func_t
hb_font_get_glyph_v_kerning_func_t
o The following API removed as such:
hb_font_funcs_set_glyph_advance_func()
hb_font_funcs_set_kerning_func()
hb_font_get_glyph_advance()
hb_font_get_kerning()
o New API added instead:
hb_font_funcs_set_glyph_h_advance_func()
hb_font_funcs_set_glyph_v_advance_func()
hb_font_funcs_set_glyph_h_origin_func()
hb_font_funcs_set_glyph_v_origin_func()
hb_font_funcs_set_glyph_h_kerning_func()
hb_font_funcs_set_glyph_v_kerning_func()
hb_font_get_glyph_h_advance()
hb_font_get_glyph_v_advance()
hb_font_get_glyph_h_origin()
hb_font_get_glyph_v_origin()
hb_font_get_glyph_h_kerning()
hb_font_get_glyph_v_kerning()
o The following higher-leve API added for convenience:
hb_font_get_glyph_advance_for_direction()
hb_font_get_glyph_origin_for_direction()
hb_font_add_glyph_origin_for_direction()
hb_font_subtract_glyph_origin_for_direction()
hb_font_get_glyph_kerning_for_direction()
hb_font_get_glyph_extents_for_origin()
hb_font_get_glyph_contour_point_for_origin()
* OpenType Layout API:
o New API:
hb_ot_layout_position_start()
hb_ot_layout_substitute_start()
hb_ot_layout_substitute_finish()
* Glue code:
o New API:
hb_glib_script_to_script()
hb_glib_script_from_script()
hb_icu_script_to_script()
hb_icu_script_from_script()
* Version API added:
o New API:
HB_VERSION_MAJOR
HB_VERSION_MINOR
HB_VERSION_MICRO
HB_VERSION_STRING
HB_VERSION_CHECK()
hb_version()
hb_version_string()
hb_version_check()