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1Overview of changes leading to 3.1.1
2Wednesday, November 8, 2021
3====================================
4- Work around GCC cast-align error/warning on some platforms. (Behdad Esfahbod)
5- Documentation improvements. (Matthias Clasen)
6
7
8Overview of changes leading to 3.1.0
9Wednesday, November 3, 2021
10====================================
11- Better offset-overflow handling in the subsetter library. (Garret Rieger)
12- Improved Unicode 14 properties in the USE shaper, and various other USE
13  shaper fixes. (David Corbett)
14- MATH and COLR v1 tables subsetting support, and various other subsetter fixes.
15  (Qunxin Liu)
16- Support for Pwo Karen / Ason Chin medial la. (Simon Cozens)
17- Apply GPOS positioning when substituting with morx table, if kerx is missing.
18  (Behdad Esfahbod)
19- Apply calt and clig features across syllable boundaries in Indic shaper.
20  (Behdad Esfahbod)
21- meson option for enabling Graphite 2 has been renamed to graphite2.
22- Build and documentation fixes.
23
24- New API:
25+hb_buffer_set_not_found_glyph()
26+hb_buffer_get_not_found_glyph()
27
28
29Overview of changes leading to 3.0.0
30Friday, September 17, 2021
31====================================
32- Unicode 14.0 support (David Corbett).
33- The hb-subset API and the harfbuzz-subset library's ABI are now declared
34  stable. The harfbuzz-subset library would not have been possible without the
35  work of Garret Rieger and Qunxin Liu from Google Fonts, and the earlier work
36  of Michiharu Ariza from Adobe.
37- The hb-style API is now stable and no longer experimental.
38
39- New API:
40+hb_style_tag_t
41+hb_style_get_value()
42+hb_subset_input_t
43+hb_subset_flags_t
44+hb_subset_sets_t
45+hb_subset_input_create_or_fail()
46+hb_subset_input_reference()
47+hb_subset_input_destroy()
48+hb_subset_input_set_user_data()
49+hb_subset_input_get_user_data()
50+hb_subset_input_unicode_set()
51+hb_subset_input_glyph_set()
52+hb_subset_input_set()
53+hb_subset_input_get_flags()
54+hb_subset_input_set_flags()
55+hb_subset_or_fail()
56
57- Removed old unstable harfbuzz-subset API:
58-hb_subset_input_nameid_set()
59-hb_subset_input_namelangid_set()
60-hb_subset_input_layout_features_set()
61-hb_subset_input_no_subset_tables_set()
62-hb_subset_input_drop_tables_set()
63-hb_subset_input_set_drop_hints()
64-hb_subset_input_get_drop_hints()
65-hb_subset_input_set_desubroutinize()
66-hb_subset_input_get_desubroutinize()
67-hb_subset_input_set_retain_gids()
68-hb_subset_input_get_retain_gids()
69-hb_subset_input_set_name_legacy()
70-hb_subset_input_get_name_legacy()
71-hb_subset_input_set_overlaps_flag()
72-hb_subset_input_get_overlaps_flag()
73-hb_subset_input_set_notdef_outline()
74-hb_subset_input_get_notdef_outline()
75-hb_subset_input_set_no_prune_unicode_ranges()
76-hb_subset_input_get_no_prune_unicode_ranges()
77-hb_subset()
78
79
80Overview of changes leading to 2.9.1
81Tuesday, September 7, 2021
82====================================
83- Final subset API is in place and if no issues are discovered, it will be the
84  stable subset API of HarfBuzz 3.0.0. Old API is kept to ease transition, but
85  will be removed in 3.0.0.
86- Various fuzzer-found bug fixes.
87- hb_buffer_append() now handles the pre- and post-context which previously
88  were left unchanged in the destination buffer.
89- hb-view / hb-shape now accept following new arguments:
90  o --unicodes-before/after: takes a list of hex numbers that represent Unicode
91    codepoints.
92- Undeprecated API:
93  hb_set_invert()
94
95
96Overview of changes leading to 2.9.0
97Wednesday, August 18, 2021
98History Repeats Itself (Afghanistan)
99====================================
100- Subsetter API is being stabilized, with the first stable API to happen in
101  3.0.0 release (https://github.com/harfbuzz/harfbuzz/issues/3078).
102- Support multiple variation axes with same tag, aka HOI.
103- The “coretext” testing shaper now passes font variations to CoreText.
104- hb-shape/hb-view does not break line at new lines unless text is read from
105  file.
106- hb-view and hb-subset has a --batch now, similar to hb-shape.
107- The --batch mode now uses ; as argument separator instead of : used previously.
108- The --batch in hb-shape does not expect 0th argument anymore. That is, the
109  lines read are interpreted as argv[1:], instead of argv[0:].
110- The --batch option has been undocumented. We are ready to document it; send
111  feedback if you find it useful.
112- hb-subset got arguments revamps. Added much-requested --gids-file, --glyphs,
113  --glyphs-file, --unicodes-file, supporting ranges in --unicodes.
114- Various bug fixes.
115
116
117Overview of changes leading to 2.8.2
118Tuesday, July 8, 2021
119====================================
120- Shaping LTR digits for RTL scripts now makes the native direction of the
121  digits LTR, applying shaping and positioning rules on the same glyph order as
122  Uniscribe. (Jonathan Kew, Khaled Hosny).
123- Subsetting COLR v1 and CPAL tables is now supported. (Garret Rieger, Qunxin Liu)
124- Various fixes and improvements to the subsetter. (Garret Rieger, Qunxin Liu, Behdad)
125- When applying morx table, mark glyph widths should not be zeroed. (Jonathan Kew)
126- GPOS is preferred over kerx, if GSUB was applied. (Behdad)
127- Regional_Indicator pairs are grouped together when clustering. (Behdad)
128- New API:
129+hb_blob_create_or_fail()
130+hb_blob_create_from_file_or_fail()
131+hb_set_copy()
132
133
134Overview of changes leading to 2.8.1
135Tuesday, May 4, 2021
136====================================
137- Subsetter now fully supports GSUB/GPOS/GDEF tables (including variations); as
138  such, layout tables are retained by subsetter by default. (Garret Rieger, Qunxin Liu)
139- Build scripts no longer check for FontConfig as HarfBuzz does not use it.
140- hb-view supports iTerm2 and kitty inline image protocols (Khaled Hosny),
141  it can also use Chafa for terminal graphics if available (Hans Petter Jansson).
142
143Overview of changes leading to 2.8.0
144Tuesday, March 16, 2021
145====================================
146- Shape joining scripts other than Arabic/Syriac using the Universal Shaping Engine.
147  Previously these were shaped using the generalized Arabic shaper. (David Corbett)
148- Fix regression in shaping of U+0B55 ORIYA SIGN OVERLINE. (David Corbett)
149- Update language tags. (David Corbett)
150- Variations: reduce error: do not round each interpolated delta. (Just van Rossum)
151- Documentation improvements. (Khaled Hosny, Nathan Willis)
152- Subsetter improvements: subsets most, if not all, lookup types now. (Garret Rieger, Qunxin Liu)
153- Fuzzer-found fixes and other improvements when memory failures happen. (Behdad)
154- Removed most atomic implementations now that we have C++11 atomic impl. (Behdad)
155- General codebase upkeep; using more C++11 features: constexpr constructors, etc. (Behdad)
156
157
158Overview of changes leading to 2.7.4
159Sunday, December 27, 2020
160====================================
161- Fix missing --enable-introspection configure option from previous release
162  tarball.
163- Documentation updates.
164
165
166Overview of changes leading to 2.7.3
167Wednesday, December 23, 2020
168====================================
169- Update USE shaper to 2020-08-13 specification, and other improvements.
170- Don’t disable liga feature in myanmar shaper, to match Uniscribe.
171- Improvements to language and script tags handling.
172- Update language system tag registry to OpenType 1.8.4
173- Support for serializing and deserializing Unicode buffers. Serialized buffers
174  are now delimited with `<>` or `[]` based on whether it is a Unicode or
175  glyphs buffer.
176- Increase buffer work limits to handle fonts with many complex lookups.
177- Handle more shaping operations in trace output.
178- Memory access fixes.
179- More OOM fixes.
180- Improved documentation.
181- Build system improvements.
182- New API:
183+hb_buffer_has_positions()
184+hb_buffer_serialize()
185+hb_buffer_serialize_unicode()
186+hb_buffer_deserialize_unicode()
187
188
189Overview of changes leading to 2.7.2
190Saturday, August 29, 2020
191====================================
192- Fix a regression in the previous release that caused a crash with Kaithi.
193- More OOM fixes.
194
195
196Overview of changes leading to 2.7.1
197Thursday, August 13, 2020
198====================================
199- ot-funcs now handles variable empty glyphs better when hvar/vvar isn't present.
200- Reverted a GDEF processing regression.
201- A couple of fixes to handle OOM better.
202
203
204Overview of changes leading to 2.7.0
205Saturday, July 25, 2020
206====================================
207- Use an implementation for round that always rounds up, some minor fluctuations
208  are expected on var font specially when hb-ot callback is used.
209- Fix an AAT's `kerx` issue on broken rendering of Devanagari Sangam MN.
210- Remove AAT's `lcar` table support from _get_ligature_carets API, not even much
211  use on macOS installed fonts (only two files).  GDEF support is the recommended
212  one and expected to work properly after issues fixed two releases ago.
213- Minor memory fixes to handle OOM better specially in hb-ft.
214- Minor .so files versioning scheme change and remove stable/unstable scheme
215  differences, was never used in practice (always default to stable scheme).
216- We are now suggesting careful packaging of the library using meson,
217  https://github.com/harfbuzz/harfbuzz/wiki/Notes-on-migration-to-meson
218  for more information.
219- Distribution package URL is changed, either use GitHub generated tarballs,
220  `https://github.com/harfbuzz/harfbuzz/archive/$pkgver.tar.gz`
221  or, even more preferably use commit hash of the release and git checkouts like,
222  `git+https://github.com/harfbuzz/harfbuzz#commit=$commit`
223
224
225Overview of changes leading to 2.6.8
226Monday, June 22, 2020
227====================================
228- New API to fetch glyph alternates from GSUB table.
229- hb-coretext build fix for macOS < 10.10.
230- Meson build fixes, cmake port removal is postponed but please prepare for
231  it and give us feedback.
232  Autotools is still our main build system however please consider
233  experimenting with meson also for packaging the library.
234- New API:
235+hb_ot_layout_lookup_get_glyph_alternates()
236
237
238Overview of changes leading to 2.6.7
239Wednesday, June 3, 2020
240====================================
241- Update to Unicode 13.0.0.
242- Fix hb_ot_layout_get_ligature_carets for fonts without lcar table, it was
243  completely broken for all the other fonts since 2.1.2.
244- As a part of our migration to meson, this release will be the last one
245  to provide cmake port files but autotools still is our main build system.
246  There is a possibility that the next version or the after be released
247  using meson.
248
249
250Overview of changes leading to 2.6.6
251Tuesday, May 12, 2020
252====================================
253- A fix in AAT kerning for Geeza Pro.
254- Better support for resource fork fonts on macOS.
255
256
257Overview of changes leading to 2.6.5
258Friday, April 17, 2020
259====================================
260- Add experimental meson build system.  Autotools is still the primary
261  and supported build system.
262- AAT is now always preferred for horizontal scripts when both AAT and OT
263  layout tables exist at the same time.
264- Subsetter improvements.
265- New API:
266+hb_ft_font_lock_face()
267+hb_ft_font_unlock_face()
268
269
270Overview of changes leading to 2.6.4
271Monday, October 29, 2019
272====================================
273- Small bug fix.
274- Build fixes.
275
276
277Overview of changes leading to 2.6.3
278Monday, October 28, 2019
279====================================
280- Misc small fixes, mostly to build-related issues.
281- New API:
282+hb_font_get_nominal_glyphs()
283
284
285Overview of changes leading to 2.6.2
286Monday, September 30, 2019
287====================================
288- Misc small fixes, mostly to build-related issues.
289
290
291Overview of changes leading to 2.6.1
292Thursday, August 22, 2019
293====================================
294- Fix regression with hb_font_create_sub_font scaling introduced in 2.6.0.
295- Change interpretation of font PTEM size / CoreText font size handling.
296  See https://github.com/harfbuzz/harfbuzz/pull/1484
297- hb-ot-font: Prefer symbol cmap subtable if present.
298- Apply 'dist'/'abvm'/'blwm' features to all scripts.
299- Drop experimental DirectWrite API.
300
301
302Overview of changes leading to 2.6.0
303Tuesday, August 13, 2019
304====================================
305- New OpenType metrics, baseline, and metadata table access APIs.
306- New API to set font variations to a named-instance.
307- New hb-gdi.h header and API for creating hb_face_t from HFONT.
308- Amalgam: Provide a single-file harfbuzz.cc file for easier alternate building.
309- More size-reduction configurable options, enabled by HB_TINY.
310- New API:
311+hb_font_set_var_named_instance()
312+hb_gdi_face_create()
313+hb_ot_layout_baseline_tag_t
314+hb_ot_layout_get_baseline()
315+hb_ot_meta_tag_t
316+hb_ot_meta_get_entry_tags()
317+hb_ot_meta_reference_entry()
318+hb_ot_metrics_tag_t
319+hb_ot_metrics_get_position()
320+hb_ot_metrics_get_variation()
321+hb_ot_metrics_get_x_variation()
322+hb_ot_metrics_get_y_variation()
323
324
325Overview of changes leading to 2.5.3
326Wednesday, June 26, 2019
327====================================
328- Fix UCD script data for Unicode 10+ scripts.  This was broken since 2.5.0.
329- More optimizations for HB_TINY.
330
331
332Overview of changes leading to 2.5.2
333Thursday, June 20, 2019
334====================================
335- More hb-config.hh facilities to shrink library size, namely when built as
336  HB_TINY.
337- New documentation of custom configurations in CONFIG.md.
338- Fix build on gcc 4.8.  That's supported again.
339- Universal Shaping Engine improvements thanks to David Corbett.
340- API Changes: Undeprecate some horizontal-kerning API and re-enable in hb-ft,
341  such that Type1 fonts will continue kerning.
342
343
344Overview of changes leading to 2.5.1
345Friday, May 31, 2019
346====================================
347- Fix build with various versions of Visual Studio.
348- Improved documentation, thanks to Nathan Willis.
349- Bugfix in subsetting glyf table.
350- Improved scripts for cross-compiling for Windows using mingw.
351- Rename HB_MATH_GLYPH_PART_FLAG_EXTENDER to HB_OT_MATH_GLYPH_PART_FLAG_EXTENDER.
352  A deprecated macro is added for backwards-compatibility.
353
354
355Overview of changes leading to 2.5.0
356Friday, May 24, 2019
357====================================
358- This release does not include much functional changes, but includes major internal
359  code-base changes.  We now require C++11.  Support for gcc 4.8 and earlier has been
360  dropped.
361- New hb-config.hh facility for compiling smaller library for embedded and web usecases.
362- New Unicode Character Databse implementation that is half the size of previously-used
363  UCDN.
364- Subsetter improvements.
365- Improved documentation, thanks to Nathan Willis.
366- Misc shaping fixes.
367
368
369Overview of changes leading to 2.4.0
370Monday, March 25, 2019
371====================================
372- Unicode 12.
373- Misc fixes.
374- Subsetter improvements.
375- New API:
376HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE
377hb_directwrite_face_create()
378
379
380Overview of changes leading to 2.3.1
381Wednesday, January 30, 2019
382====================================
383- AAT bug fixes.
384- Misc internal housekeeping cleanup.
385
386
387Overview of changes leading to 2.3.0
388Thursday, December 20, 2018
389====================================
390- Fix regression on big-endian architectures.  Ouch!
391- Misc bug and build fixes.
392- Fix subsetting of simple GSUB/GDEF.
393- Merge CFF / CFF2 support contributed by Adobe.  This mostly involves
394  the subsetter, but also get_glyph_extents on CFF fonts.
395
396New API in hb-aat.h:
397+hb_aat_layout_has_substitution()
398+hb_aat_layout_has_positioning()
399+hb_aat_layout_has_tracking()
400
401
402Overview of changes leading to 2.2.0
403Thursday, November 29, 2018
404====================================
405- Misc shaping bug fixes.
406- Add font variations named-instance API.
407- Deprecate font variations axis enumeration API and add replacement.
408- AAT shaping improvements:
409  o Fixed 'kern' table Format 2 implementation.
410  o Implement 'feat' table API for feature detection.
411  o Blacklist 'GSUB' table of fonts from 'MUTF' foundry that also have 'morx'.
412
413New API:
414+hb_aat_layout_feature_type_t
415+hb_aat_layout_feature_selector_t
416+hb_aat_layout_get_feature_types()
417+hb_aat_layout_feature_type_get_name_id
418+hb_aat_layout_feature_selector_info_t
419+HB_AAT_LAYOUT_NO_SELECTOR_INDEX
420+hb_aat_layout_feature_type_get_selector_infos()
421+hb_ot_var_axis_flags_t
422+hb_ot_var_axis_info_t
423+hb_ot_var_get_axis_infos()
424+hb_ot_var_find_axis_info()
425+hb_ot_var_get_named_instance_count()
426+hb_ot_var_named_instance_get_subfamily_name_id()
427+hb_ot_var_named_instance_get_postscript_name_id()
428+hb_ot_var_named_instance_get_design_coords()
429
430Deprecated API:
431+HB_OT_VAR_NO_AXIS_INDEX
432+hb_ot_var_axis_t
433+hb_ot_var_get_axes()
434+hb_ot_var_find_axis()
435
436
437Overview of changes leading to 2.1.3
438Friday, November 16, 2018
439====================================
440- Fix AAT 'mort' shaping, which was broken in 2.1.2
441
442
443Overview of changes leading to 2.1.2
444Friday, November 16, 2018
445====================================
446- Various internal changes.
447- AAT shaping improvements:
448  o Implement kern table Format 1 state-machine-based kerning.
449  o Implement cross-stream kerning (cursive positioning, etc).
450  o Ignore emptyish GSUB tables (zero scripts) if morx present.
451  o Don't apply GPOS if morx is being applied.  Matches Apple.
452
453
454-Overview of changes leading to 2.1.1
455Monday, November 5, 2018
456====================================
457- AAT improvements:
458  o Implement 'mort' table.
459  o Implement 'kern' subtables Format 1 and Format 3.
460
461
462Overview of changes leading to 2.1.0
463Tuesday, October 30, 2018
464====================================
465- AAT shaping improvements:
466  o Allow user controlling AAT features, for whole buffer only currently.
467  o Several 'morx' fixes.
468  o Implement tuple-kerns in 'kerx'; Fixes kerning with Apple default
469    San Francisco fonts.
470- Support for color fonts:
471  o COLR/CPAL API to fetch color layers.
472  o SVG table to fetch SVG documents.
473  o CBDT/sbix API to fetch PNG images.
474- New 'name' table API.
475- hb-ot-font now uses 'VORG' table to correctly position CFF glyphs
476  in vertical layout.
477- Various fuzzer-found bug fixes.
478
479Changed API:
480
481A type and a macro added in 2.0.0 were renamed:
482
483hb_name_id_t -> hb_ot_name_id_t
484HB_NAME_ID_INVALID -> HB_OT_NAME_ID_INVALID
485
486New API:
487
488+hb_color_t
489+HB_COLOR
490+hb_color_get_alpha()
491+hb_color_get_red()
492+hb_color_get_green()
493+hb_color_get_blue()
494+hb_ot_color_has_palettes()
495+hb_ot_color_palette_get_count()
496+hb_ot_color_palette_get_name_id()
497+hb_ot_color_palette_color_get_name_id()
498+hb_ot_color_palette_flags_t
499+hb_ot_color_palette_get_flags()
500+hb_ot_color_palette_get_colors()
501+hb_ot_color_has_layers()
502+hb_ot_color_layer_t
503+hb_ot_color_glyph_get_layers()
504+hb_ot_color_has_svg()
505+hb_ot_color_glyph_reference_svg()
506+hb_ot_color_has_png()
507+hb_ot_color_glyph_reference_png()
508
509+hb_ot_name_id_t
510+HB_OT_NAME_ID_INVALID
511+HB_OT_NAME_ID_COPYRIGHT
512+HB_OT_NAME_ID_FONT_FAMILY
513+HB_OT_NAME_ID_FONT_SUBFAMILY
514+HB_OT_NAME_ID_UNIQUE_ID
515+HB_OT_NAME_ID_FULL_NAME
516+HB_OT_NAME_ID_VERSION_STRING
517+HB_OT_NAME_ID_POSTSCRIPT_NAME
518+HB_OT_NAME_ID_TRADEMARK
519+HB_OT_NAME_ID_MANUFACTURER
520+HB_OT_NAME_ID_DESIGNER
521+HB_OT_NAME_ID_DESCRIPTION
522+HB_OT_NAME_ID_VENDOR_URL
523+HB_OT_NAME_ID_DESIGNER_URL
524+HB_OT_NAME_ID_LICENSE
525+HB_OT_NAME_ID_LICENSE_URL
526+HB_OT_NAME_ID_TYPOGRAPHIC_FAMILY
527+HB_OT_NAME_ID_TYPOGRAPHIC_SUBFAMILY
528+HB_OT_NAME_ID_MAC_FULL_NAME
529+HB_OT_NAME_ID_SAMPLE_TEXT
530+HB_OT_NAME_ID_CID_FINDFONT_NAME
531+HB_OT_NAME_ID_WWS_FAMILY
532+HB_OT_NAME_ID_WWS_SUBFAMILY
533+HB_OT_NAME_ID_LIGHT_BACKGROUND
534+HB_OT_NAME_ID_DARK_BACKGROUND
535+HB_OT_NAME_ID_VARIATIONS_PS_PREFIX
536+hb_ot_name_entry_t
537+hb_ot_name_list_names()
538+hb_ot_name_get_utf8()
539+hb_ot_name_get_utf16()
540+hb_ot_name_get_utf32()
541
542
543Overview of changes leading to 2.0.2
544Saturday, October 20, 2018
545====================================
546- Fix two minor memory access issues in AAT tables.
547
548
549Overview of changes leading to 2.0.1
550Friday, October 19, 2018
551====================================
552- Fix hb-version.h reported release version that went wrong (1.8.0)
553  with previous release.
554- Fix extrapolation in 'trak' table.
555- Fix hb-font infinite-recursion issue with some font funcs and
556  subclassed fonts.
557- Implement variation-kerning format in kerx table, although without
558  variation.
559- Fix return value of hb_map_is_empty().
560
561
562Overview of changes leading to 2.0.0
563Thursday, October 18, 2018
564====================================
565- Added AAT shaping support (morx/kerx/trak).
566  Automatically used if GSUB/GPOS are not available respectively.
567  Set HB_OPTIONS=aat env var to have morx/kerx preferred over
568  GSUB/GPOS.
569- Apply TrueType kern table internally, instead of relying on
570  hb_font_t callbacks.
571- Khmer shaper significantly rewritten to better match Uniscribe.
572- Indic3 tags ('dev3', etc) are passed to USE shaper.
573- .dfont Mac font containers implemented.
574- Script- and language-mapping revamped to better use BCP 47.
575- Misc USE and Indic fixes.
576- Misc everything fixes.
577- Too many things to list.  Biggest release since 0.9.1, with
578  over 500 commits in just over 5 weeks!  Didn't intend it to
579  be a big release.  Just happened to become.
580- hb-ft now locks underlying FT_Face during use.
581
582API changes:
583
584- Newly-created hb_font_t's now have our internal "hb-ot-font"
585  callbacks set on them, so they should work out of the box
586  without any callbacks set.  If callbacks are set, everything
587  is back to what it was before, the fallback callbacks are
588  null.  If you to get the internal implementation modified,
589  sub_font it.
590
591- New hb_font_funcs_set_nominal_glyphs_func() allows speeding
592  up character to glyph mapping.
593
594New API:
595+HB_FEATURE_GLOBAL_START
596+HB_FEATURE_GLOBAL_END
597+hb_buffer_set_invisible_glyph()
598+hb_buffer_get_invisible_glyph()
599+hb_font_funcs_set_nominal_glyphs_func()
600+hb_ot_layout_table_select_script()
601+hb_ot_layout_script_select_language()
602+hb_ot_layout_feature_get_name_ids()
603+hb_ot_layout_feature_get_characters()
604+hb_name_id_t
605+HB_NAME_ID_INVALID
606+HB_OT_MAX_TAGS_PER_SCRIPT
607+hb_ot_tags_from_script_and_language()
608+hb_ot_tags_to_script_and_language()
609
610Deprecated API:
611-hb_font_funcs_set_glyph_func()
612-hb_unicode_eastasian_width_func_t
613-hb_unicode_funcs_set_eastasian_width_func()
614-hb_unicode_eastasian_width()
615-hb_unicode_decompose_compatibility_func_t
616-HB_UNICODE_MAX_DECOMPOSITION_LEN
617-hb_unicode_funcs_set_decompose_compatibility_func()
618-hb_unicode_decompose_compatibility()
619-hb_font_funcs_set_glyph_h_kerning_func()
620-hb_font_funcs_set_glyph_v_kerning_func()
621-hb_font_get_glyph_h_kerning()
622-hb_font_get_glyph_v_kerning()
623-hb_font_get_glyph_kerning_for_direction()
624-hb_ot_layout_table_choose_script()
625-hb_ot_layout_script_find_language()
626-hb_ot_tags_from_script()
627-hb_ot_tag_from_language()
628
629
630Overview of changes leading to 1.9.0
631Monday, September 10, 2018
632====================================
633- Added 'cmap' API to hb_face_t.
634- Face-builder API.
635- hb-ot-font re-creation should be much leaner now, as the
636  font tables it uses are cached on hb_face_t now.
637- Internal source header file name changes:
638  hb-*-private.hh is renamed to hb-*.hh.
639
640New API:
641+HB_UNICODE_MAX
642+hb_face_collect_unicodes()
643+hb_face_collect_variation_selectors()
644+hb_face_collect_variation_unicodes()
645+hb_face_builder_create()
646+hb_face_builder_add_table()
647
648
649Overview of changes leading to 1.8.8
650Tuesday, August 14, 2018
651====================================
652- Fix hb-icu crash on architectures where compare_exchange_weak() can
653  fail falsely.  This bug was introduced in 1.8.4.
654  https://bugs.chromium.org/p/chromium/issues/detail?id=873568
655- More internal refactoring of atomic operations and singletons.
656- API changes:
657  The following functions do NOT reference their return value before
658  returning:
659  * hb_unicode_funcs_get_default()
660  * hb_glib_get_unicode_funcs()
661  * hb_icu_get_unicode_funcs()
662  This is consistent with their naming ("get", instead of "reference")
663  as well as how they are used in the wild (ie. no one calls destroy()
664  on their return value.)
665
666
667Overview of changes leading to 1.8.7
668Wednesday, August 8, 2018
669====================================
670- Fix assertion failure with GDEF-blacklisted fonts.
671
672
673Overview of changes leading to 1.8.6
674Tuesday, August 7, 2018
675====================================
676- Internal code shuffling.
677- New API to speed up getting advance widths for implementations
678  that have heavy overhead in get_h_advance callback:
679+hb_font_funcs_set_glyph_h_advances_func
680+hb_font_funcs_set_glyph_v_advances_func
681+hb_font_get_glyph_advances_for_direction
682+hb_font_get_glyph_h_advances
683+hb_font_get_glyph_h_advances_func_t
684+hb_font_get_glyph_v_advances
685+hb_font_get_glyph_v_advances_func_t
686
687
688Overview of changes leading to 1.8.5
689Wednesday, August 1, 2018
690====================================
691- Major Khmer shaper improvements to better match Microsoft.
692- Indic bug fixes.
693- Internal improvements to atomic operations.
694
695
696Overview of changes leading to 1.8.4
697Tuesday, July 17, 2018
698====================================
699- Fix build on non-C++11.
700- Use C++-style GCC atomics and C++11 atomics.
701
702
703Overview of changes leading to 1.8.3
704Wednesday, July 11, 2018
705====================================
706- A couple of Indic / USE bug fixes.
707- Disable vectorization, as it was causing unaligned access bus error on
708  certain 32bit architectures.
709
710
711Overview of changes leading to 1.8.2
712Tuesday, July 3, 2018
713====================================
714- Fix infinite loop in Khmer shaper.
715- Improve hb_blob_create_from_file() for streams.
716
717
718Overview of changes leading to 1.8.1
719Tuesday, June 12, 2018
720====================================
721- Fix hb-version.h file generation; last two releases went out with wrong ones.
722- Add correctness bug in hb_set_t operations, introduced in 1.7.7.
723- Remove HB_SUBSET_BUILTIN build option.  Not necessary.
724
725
726Overview of changes leading to 1.8.0
727Tuesday, June 5, 2018
728====================================
729- Update to Unicode 11.0.0.
730
731
732Overview of changes leading to 1.7.7
733Tuesday, June 5, 2018
734====================================
735- Lots of internal changes, but not yet exposed externally.
736- All HarfBuzz objects are significantly smaller in size now.
737- Sinhala: Position repha on top of post-consonant, not base.
738  This better matches Windows 10 behavior, which was changed
739  from previous Windows versions.
740- New build options:
741  o New cpp macro HB_NO_ATEXIT
742  o New cpp macro HB_SUBSET_BUILTIN
743- Significant libharfbuzz-subset changes. API subject to change.
744- New API in libharfbuzz:
745
746+hb_blob_create_from_file()
747+hb_face_count()
748
749A hashmap implementation:
750+hb-map.h
751+HB_MAP_VALUE_INVALID
752+hb_map_t
753+hb_map_create()
754+hb_map_get_empty()
755+hb_map_reference()
756+hb_map_destroy()
757+hb_map_set_user_data()
758+hb_map_get_user_data()
759+hb_map_allocation_successful()
760+hb_map_clear()
761+hb_map_is_empty()
762+hb_map_get_population()
763+hb_map_set()
764+hb_map_get()
765+hb_map_del()
766+hb_map_has()
767
768
769Overview of changes leading to 1.7.6
770Wednesday, March 7, 2018
771====================================
772
773- Fix to hb_set_t binary operations. Ouch.
774- New experimental harfbuzz-subset library. All of hb-subset.h
775  is experimental right now and API WILL change.
776
777- New API:
778hb_blob_copy_writable_or_fail()
779HB_OT_TAG_BASE
780hb_set_previous()
781hb_set_previous_range()
782
783
784Overview of changes leading to 1.7.5
785Tuesday, January 30, 2018
786====================================
787
788- Separate Khmer shaper from Indic.
789- First stab at AAT morx. Not hooked up.
790- Misc bug fixes.
791
792
793Overview of changes leading to 1.7.4
794Wednesday, December 20, 2017
795====================================
796
797- Fix collect_glyphs() regression caused by hb_set_t changes.
798
799
800Overview of changes leading to 1.7.3
801Monday, December 18, 2017
802====================================
803
804- hb_set_t performance tuning and optimizations.
805- Speed up collect_glyphs() and reject garbage data.
806- In hb_coretext_font_create() set font point-size (ptem).
807- Misc fixes.
808
809
810Overview of changes leading to 1.7.2
811Monday, December 4, 2017
812====================================
813
814- Optimize hb_set_add_range().
815- Misc fixes.
816- New API:
817hb_coretext_font_create()
818
819
820Overview of changes leading to 1.7.1
821Tuesday, November 14, 2017
822====================================
823
824- Fix atexit object destruction regression.
825- Fix minor integer-overflow.
826
827
828Overview of changes leading to 1.7.0
829Monday, November 13, 2017
830====================================
831
832- Minor Indic fixes.
833- Implement kerning and glyph names in hb-ot-font.
834- Various DSO optimization re .data and .bss sizes.
835- Make C++11 optional; build fixes.
836- Mark all other backends "unsafe-to-break".
837- Graphite fix.
838
839
840Overview of changes leading to 1.6.3
841Thursday, October 26th, 2017
842====================================
843
844- Fix hb_set_t some more.  Should be solid now.
845- Implement get_glyph_name() for hb-ot-font.
846- Misc fixes.
847
848
849Overview of changes leading to 1.6.2
850Monday, October 23nd, 2017
851====================================
852
853- Yesterday's release had a bad crasher; don't use it.  That's what
854  happens when one works on Sunday...
855  https://github.com/harfbuzz/harfbuzz/issues/578
856- Build fixes for FreeBSD and Chrome Android.
857
858
859Overview of changes leading to 1.6.1
860Sunday, October 22nd, 2017
861====================================
862
863- Don't skip over COMBINING GRAPHEME JOINER when ligating, etc.
864  To be refined: https://github.com/harfbuzz/harfbuzz/issues/554
865- Faster hb_set_t implementation.
866- Don't use deprecated ICU API.
867- Fix undefined-behavior in Myanmar shaper, introduced in 1.6.0
868- Deprecated API:
869  hb_set_invert()
870
871
872Overview of changes leading to 1.6.0
873Friday, October the 13th, 2017
874====================================
875
876- Update to Unicode 10.
877
878- Various Indic and Universal Shaping Engine fixes as a result of
879  HarfBuzz Hackfest with Jonathan Kew at Web Engines Hackfest at
880  the Igalia offices in A Coruña, Spain.  Thanks Igalia for having
881  us!
882
883- Implement Unicode Arabic Mark Ordering Algorithm UTR#53.
884
885- Implement optical sizing / tracking in CoreText backend, using
886  new API hb_font_set_ptem().
887
888- Allow notifying hb_font_t that underlying FT_Face changed sizing,
889  using new API hb_ft_font_changed().
890
891- More Graphite backend RTL fixes.
892
893- Fix caching of variable font shaping plans.
894
895- hb-view / hb-shape now accept following new arguments:
896
897  o --unicodes: takes a list of hex numbers that represent Unicode
898    codepoints.
899
900New API:
901+hb_face_get_table_tags()
902+hb_font_set_ptem()
903+hb_font_get_ptem()
904+hb_ft_font_changed()
905
906
907Overview of changes leading to 1.5.1
908Tuesday, September 5, 2017
909====================================
910
911- Fix "unsafe-to-break" in fallback shaping and other corner cases.
912  All our tests pass with --verify now, meaning unsafe-to-break API
913  works as expected.
914- Add --unicodes to hb-view / hb-shape.
915- [indic] Treat Consonant_With_Stacker as consonant.  This will need
916  further tweaking.
917- hb_buffer_diff() tweaks.
918
919
920Overview of changes leading to 1.5.0
921Wednesday, August 23, 2017
922====================================
923
924- Misc new API, for appending a buffer to another, and for comparing
925  contents of two buffers for types of differences.
926
927- New "unsafe-to-break" API.  Can be used to speed up reshaping
928  in line-breaking situations.  Essentially, after shaping, it returns
929  positions in the input string (some of the cluster boundaries) that
930  are "safe to break" in that if the text is segmented at that position
931  and two sides reshaped and concatenated, the shaping result is
932  exactly the same as shaping the text in one piece.
933
934  hb-view and hb-shape and hb-shape now take --verify, which verifies
935  the above property.
936
937  Some corner cases of the implementation are still not quite working.
938  Those will be fixed in subsequent releases.
939
940- New API:
941
942hb_buffer_append()
943
944hb_glyph_flags_t
945HB_GLYPH_FLAG_UNSAFE_TO_BREAK
946HB_GLYPH_FLAG_DEFINED
947hb_glyph_info_get_glyph_flags()
948
949HB_BUFFER_SERIALIZE_FLAG_GLYPH_FLAGS
950
951hb_buffer_diff_flags_t
952HB_BUFFER_DIFF_FLAG_EQUAL
953HB_BUFFER_DIFF_FLAG_CONTENT_TYPE_MISMATCH
954HB_BUFFER_DIFF_FLAG_LENGTH_MISMATCH
955HB_BUFFER_DIFF_FLAG_NOTDEF_PRESENT
956HB_BUFFER_DIFF_FLAG_DOTTED_CIRCLE_PRESENT
957HB_BUFFER_DIFF_FLAG_CODEPOINT_MISMATCH
958HB_BUFFER_DIFF_FLAG_CLUSTER_MISMATCH
959HB_BUFFER_DIFF_FLAG_GLYPH_FLAGS_MISMATCH
960HB_BUFFER_DIFF_FLAG_POSITION_MISMATCH
961hb_buffer_diff
962
963
964Overview of changes leading to 1.4.8
965Tuesday, August 8, 2017
966====================================
967
968- Major fix to avar table handling.
969- Rename hb-shape --show-message to --trace.
970- Build fixes.
971
972
973Overview of changes leading to 1.4.7
974Tuesday, July 18, 2017
975====================================
976
977- Multiple Indic, Tibetan, and Cham fixes.
978- CoreText: Allow disabling kerning.
979- Adjust Arabic feature order again.
980- Misc build fixes.
981
982
983Overview of changes leading to 1.4.6
984Sunday, April 23, 2017
985====================================
986
987- Graphite2: Fix RTL positioning issue.
988- Backlist GDEF of more versions of Padauk and Tahoma.
989- New, experimental, cmake alternative build system.
990
991
992Overview of changes leading to 1.4.5
993Friday, March 10, 2017
994====================================
995
996- Revert "Fix Context lookup application when moving back after a glyph..."
997  This introduced memory access problems.  To be fixed properly soon.
998
999
1000Overview of changes leading to 1.4.4
1001Sunday, March 5, 2017
1002====================================
1003
1004- Fix Context lookup application when moving back after a glyph deletion.
1005- Fix buffer-overrun in Bengali.
1006
1007
1008Overview of changes leading to 1.4.3
1009Saturday, February 25, 2017
1010====================================
1011
1012- Route Adlam script to Arabic shaper.
1013- Misc fixes.
1014- New API:
1015  hb_font_set_face()
1016- Deprecate API:
1017  hb_graphite2_font_get_gr_font()
1018
1019
1020Overview of changes leading to 1.4.2
1021Monday, January 23, 2017
1022====================================
1023
1024- Implement OpenType Font Variation tables avar/fvar/HVAR/VVAR.
1025- hb-shape and hb-view now accept --variations.
1026- New API:
1027
1028hb_variation_t
1029hb_variation_from_string()
1030hb_variation_to_string()
1031
1032hb_font_set_variations()
1033hb_font_set_var_coords_design()
1034hb_font_get_var_coords_normalized()
1035
1036hb-ot-var.h:
1037hb_ot_var_axis_t
1038hb_ot_var_has_data()
1039hb_ot_var_get_axis_count()
1040hb_ot_var_get_axes()
1041hb_ot_var_find_axis()
1042hb_ot_var_normalize_variations()
1043hb_ot_var_normalize_coords()
1044
1045- MVAR to be implemented later.  Access to named instances to be
1046  implemented later as well.
1047
1048- Misc fixes.
1049
1050
1051Overview of changes leading to 1.4.1
1052Thursday, January 5, 2017
1053====================================
1054
1055- Always build and use UCDN for Unicode data by default.
1056  Reduces dependence on version of Unicode data in glib,
1057  specially in the Windows bundles we are shipping, which
1058  have very old glib.
1059
1060
1061Overview of changes leading to 1.4.0
1062Thursday, January 5, 2017
1063====================================
1064
1065- Merged "OpenType GX" branch which adds core of support for
1066  OpenType 1.8 Font Variations.  To that extent, the relevant
1067  new API is:
1068
1069New API:
1070hb_font_set_var_coords_normalized()
1071
1072  with supporting API:
1073
1074New API:
1075HB_OT_LAYOUT_NO_VARIATIONS_INDEX
1076hb_ot_layout_table_find_feature_variations()
1077hb_ot_layout_feature_with_variations_get_lookups()
1078hb_shape_plan_create2()
1079hb_shape_plan_create_cached2()
1080
1081  Currently variations in GSUB/GPOS/GDEF are fully supported,
1082  and no other tables are supported.  In particular, fvar/avar
1083  are NOT supported, hence the hb_font_set_var_coords_normalized()
1084  taking normalized coordinates.  API to take design coordinates
1085  will be added in the future.
1086
1087  HVAR/VVAR/MVAR support will also be added to hb-ot-font in the
1088  future.
1089
1090- Fix regression in GDEF glyph class processing.
1091- Add decompositions for Chakma, Limbu, and Balinese in USE shaper.
1092- Misc fixes.
1093
1094
1095Overview of changes leading to 1.3.4
1096Monday, December 5, 2016
1097====================================
1098
1099- Fix vertical glyph origin in hb-ot-font.
1100- Implement CBDT/CBLC color font glyph extents in hb-ot-font.
1101
1102
1103Overview of changes leading to 1.3.3
1104Wednesday, September 28, 2016
1105====================================
1106
1107- Implement parsing of OpenType MATH table.
1108New API:
1109HB_OT_TAG_MATH
1110HB_OT_MATH_SCRIPT
1111hb_ot_math_constant_t
1112hb_ot_math_kern_t
1113hb_ot_math_glyph_variant_t
1114hb_ot_math_glyph_part_flags_t
1115hb_ot_math_glyph_part_t
1116hb_ot_math_has_data
1117hb_ot_math_get_constant
1118hb_ot_math_get_glyph_italics_correction
1119hb_ot_math_get_glyph_top_accent_attachment
1120hb_ot_math_get_glyph_kerning
1121hb_ot_math_is_glyph_extended_shape
1122hb_ot_math_get_glyph_variants
1123hb_ot_math_get_min_connector_overlap
1124hb_ot_math_get_glyph_assembly
1125
1126
1127Overview of changes leading to 1.3.2
1128Wednesday, September 27, 2016
1129====================================
1130
1131- Fix build of hb-coretext on older OS X versions.
1132
1133
1134Overview of changes leading to 1.3.1
1135Wednesday, September 7, 2016
1136====================================
1137
1138- Blacklist bad GDEF of more fonts (Padauk).
1139- More CoreText backend crash fixes with OS X 10.9.5.
1140- Misc fixes.
1141
1142
1143Overview of changes leading to 1.3.0
1144Thursday, July 21, 2016
1145====================================
1146
1147- Update to Unicode 9.0.0
1148- Move Javanese from Indic shaper to Universal Shaping Engine.
1149- Allow MultipleSubst to delete a glyph (matching Windows engine).
1150- Update Universal Shaping Engine to latest draft from Microsoft.
1151- DirectWrite backend improvements.  Note: this backend is for testing ONLY.
1152- CoreText backend improvements with unreachable fonts.
1153- Implement symbol fonts (cmap 3.0.0) in hb-ft and hb-ot-font.
1154- Blacklist bad GDEF of more fonts (Tahoma & others).
1155- Misc fixes.
1156
1157
1158Overview of changes leading to 1.2.7
1159Monday, May 2, 2016
1160====================================
1161
1162- Blacklist another version of Times New Roman (Bold) Italic from Windows 7.
1163- Fix Mongolian Free Variation Selectors shaping with certain fonts.
1164- Fix Tibetan shorthand contractions shaping.
1165- Improved list of language tag mappings.
1166- Unbreak build on Windows CE.
1167- Make 'glyf' table loading lazy in hb-ot-font.
1168
1169
1170Overview of changes leading to 1.2.6
1171Friday, April 8, 2016
1172====================================
1173
1174- Blacklist GDEF table of another set of Times New Roman (Bold) Italic.
1175- DirectWrite backend improvements.  Note: DirectWrite backend is
1176  exclusively for our internal testing and should NOT be used in any
1177  production system whatsoever.
1178
1179
1180Overview of changes leading to 1.2.5
1181Monday, April 4, 2016
1182====================================
1183
1184- Fix GDEF mark-filtering-set, which was broken in 1.2.3.
1185
1186
1187Overview of changes leading to 1.2.4
1188Thursday, March 17, 2016
1189====================================
1190
1191- Synthesize GDEF glyph class for any glyph that does not have one in GDEF.
1192  I really hope we don't discover broken fonts that shape badly with this
1193  change.
1194- Misc build and other minor fixes.
1195- API changes:
1196  - Added HB_NDEBUG.  It's fine for production systems to define this to
1197    disable high-overhead debugging checks.  However, I also reduced the
1198    overhead of those checks, so it's a non-issue right now.  You can
1199    forget it.  Just not defining anything at all is fine.
1200
1201
1202Overview of changes leading to 1.2.3
1203Thursday, February 25, 2016
1204====================================
1205
1206- Blacklist GDEF table of certain versions of Times New Roman (Bold) Italic,
1207  due to bug in glyph class of ASCII double-quote character.  This should
1208  address "regression" introduced in 1.2.0 when we switched mark zeroing
1209  in most shapers from BY_UNICODE_LATE to BY_GDEF_LATE.
1210  This fourth release in a week should finally stablize things...
1211
1212- hb-ot-font's get_glyph() implementation saw some optimizations.  Though,
1213  might be really hard to measure in real-world situations.
1214
1215- Also, two rather small API changes:
1216
1217We now disable some time-consuming internal bookkeeping if built with NDEBUG
1218defined.  This is a first time that we use NDEBUG to disable debug code.  If
1219there exist production systems that do NOT want to enable NDEBUG, please let
1220me know and I'll add HB_NDEBUG.
1221
1222Added get_nominal_glyph() and get_variation_glyph() instead of get_glyph()
1223
1224New API:
1225- hb_font_get_nominal_glyph_func_t
1226- hb_font_get_variation_glyph_func_t
1227- hb_font_funcs_set_nominal_glyph_func()
1228- hb_font_funcs_set_variation_glyph_func()
1229- hb_font_get_nominal_glyph()
1230- hb_font_get_variation_glyph()
1231
1232Deprecated API:
1233- hb_font_get_glyph_func_t
1234- hb_font_funcs_set_glyph_func()
1235
1236Clients that implement their own font-funcs are encouraged to replace
1237their get_glyph() implementation with a get_nominal_glyph() and
1238get_variation_glyph() pair.  The variation version can assume that
1239variation_selector argument is not zero.  Old (deprecated) functions
1240will continue working indefinitely using internal gymnastics; it is
1241just more efficient to use the new functions.
1242
1243
1244Overview of changes leading to 1.2.2
1245Wednesday, February 24, 2016
1246====================================
1247
1248- Fix regression with mark positioning with fonts that have
1249  non-zero mark advances.  This was introduced in 1.2.0 while
1250  trying to make mark and cursive attachments to work together.
1251  I have partially reverted that, so this version is much more
1252  like what we had before.  All clients who updated to 1.2.0
1253  should update to this version.
1254
1255
1256Overview of changes leading to 1.2.1
1257Tuesday, February 23, 2016
1258====================================
1259
1260- CoreText: Fix bug with wrong scale if font scale was changed later.
1261  https://github.com/libass/libass/issues/212
1262- CoreText: Drastically speed up font initialization.
1263- CoreText: Fix tiny leak.
1264- Group ZWJ/ZWNJ with previous syllable under cluster-level=0.
1265  https://github.com/harfbuzz/harfbuzz/issues/217
1266- Add test/shaping/README.md about how to add tests to the suite.
1267
1268
1269Overview of changes leading to 1.2.0
1270Friday, February 19, 2016
1271====================================
1272
1273- Fix various issues (hangs mostly) in case of memory allocation failure.
1274- Change mark zeroing types of most shapers from BY_UNICODE_LATE to
1275  BY_GDEF_LATE.  This seems to be what Uniscribe does.
1276- Change mark zeroing of USE shaper from NONE to BY_GDEF_EARLY.  That's
1277  what Windows does.
1278- Allow GPOS cursive connection on marks, and fix the interaction with
1279  mark attachment.  This work resulted in some changes to how mark
1280  attachments work.  See:
1281  https://github.com/harfbuzz/harfbuzz/issues/211
1282  https://github.com/harfbuzz/harfbuzz/commit/86c68c7a2c971efe8e35b1f1bd99401dc8b688d2
1283- Graphite2 shaper: improved negative advance handling (eg. Nastaliq).
1284- Add nmake-based build system for Windows.
1285- Minor speedup.
1286- Misc. improvements.
1287
1288
1289Overview of changes leading to 1.1.3
1290Monday, January 11, 2016
1291====================================
1292
1293- Ported Indic shaper to Unicode 8.0 data.
1294- Universal Shaping Engine fixes.
1295- Speed up CoreText shaper when font fallback happens in CoreText.
1296- Documentation improvements, thanks to Khaled Hosny.
1297- Very rough directwrite shaper for testing, thanks to Ebrahim Byagowi.
1298- Misc bug fixes.
1299- New API:
1300
1301  * Font extents:
1302      hb_font_extents_t
1303      hb_font_get_font_extents_func_t
1304      hb_font_get_font_h_extents_func_t
1305      hb_font_get_font_v_extents_func_t
1306      hb_font_funcs_set_font_h_extents_func
1307      hb_font_funcs_set_font_v_extents_func
1308      hb_font_get_h_extents
1309      hb_font_get_v_extents
1310      hb_font_get_extents_for_direction
1311
1312  * Buffer message (aka debug):
1313      hb_buffer_message_func_t
1314      hb_buffer_set_message_func()
1315    Actual message protocol to be fleshed out later.
1316
1317
1318Overview of changes leading to 1.1.2
1319Wednesday, November 26, 2015
1320====================================
1321
1322- Fix badly-broken fallback shaper that affected terminology.
1323  https://github.com/harfbuzz/harfbuzz/issues/187
1324- Fix y_scaling in Graphite shaper.
1325- API changes:
1326  * An unset glyph_h_origin() function in font-funcs now (sensibly)
1327    implies horizontal origin at 0,0.  Ie, the nil callback returns
1328    true instead of false.  As such, implementations that have a
1329    glyph_h_origin() that simply returns true, can remove that function
1330    with HarfBuzz >= 1.1.2.  This results in a tiny speedup.
1331
1332
1333Overview of changes leading to 1.1.1
1334Wednesday, November 24, 2015
1335====================================
1336
1337- Build fixes, specially for hb-coretext.
1338
1339
1340Overview of changes leading to 1.1.0
1341Wednesday, November 18, 2015
1342====================================
1343
1344- Implement 'stch' stretch feature for Syriac Abbreviation Mark.
1345  https://github.com/harfbuzz/harfbuzz/issues/141
1346- Disable use of decompose_compatibility() callback.
1347- Implement "shaping" of various Unicode space characters, even
1348  if the font does not support them.
1349  https://github.com/harfbuzz/harfbuzz/issues/153
1350- If font does not support U+2011 NO-BREAK HYPHEN, fallback to
1351  U+2010 HYPHEN.
1352- Changes resulting from libFuzzer continuous fuzzing:
1353  * Reject font tables that need more than 8 edits,
1354  * Bound buffer growth during shaping to 32x,
1355  * Fix assertions and other issues at OOM / buffer max-growth.
1356- Misc fixes and optimizations.
1357- API changes:
1358  * All fonts created with hb_font_create() now inherit from
1359    (ie. have parent) hb_font_get_empty().
1360
1361
1362Overview of changes leading to 1.0.6
1363Thursday, October 15, 2015
1364====================================
1365
1366- Reduce max nesting level in OT lookups from 8 to 6.
1367  Should not affect any real font as far as I know.
1368- Fix memory access issue in ot-font.
1369- Revert default load-flags of fonts created using hb_ft_font_create()
1370  back to FT_LOAD_DEFAULT|FT_LOAD_NO_HINTING.  This was changed in
1371  last release (1.0.5), but caused major issues, so revert.
1372  https://github.com/harfbuzz/harfbuzz/issues/143
1373
1374
1375Overview of changes leading to 1.0.5
1376Tuesday, October 13, 2015
1377====================================
1378
1379- Fix multiple memory access bugs discovered using libFuzzer.
1380  https://github.com/harfbuzz/harfbuzz/issues/139
1381  Everyone should upgrade to this version as soon as possible.
1382  We now have continuous fuzzing set up, to avoid issues like
1383  these creeping in again.
1384- Misc fixes.
1385
1386- New API:
1387  * hb_font_set_parent().
1388  * hb_ft_font_[sg]et_load_flags()
1389    The default flags for fonts created using hb_ft_font_create()
1390    has changed to default to FT_LOAD_DEFAULT now.  Previously it
1391    was defaulting to FT_LOAD_DFEAULT|FT_LOAD_NO_HINTING.
1392
1393- API changes:
1394  * Fonts now default to units-per-EM as their scale, instead of 0.
1395  * hb_font_create_sub_font() does NOT make parent font immutable
1396    anymore.  hb_font_make_immutable() does.
1397
1398
1399Overview of changes leading to 1.0.4
1400Wednesday, September 30, 2015
1401====================================
1402
1403- Fix minor out-of-bounds read error.
1404
1405
1406Overview of changes leading to 1.0.3
1407Tuesday, September 1, 2015
1408====================================
1409
1410- Start of user documentation, from Simon Cozens!
1411- Implement glyph_extents() for TrueType fonts in hb-ot-font.
1412- Improve GPOS cursive attachments with conflicting lookups.
1413- More fixes for cluster-level = 1.
1414- Uniscribe positioning fix.
1415
1416
1417Overview of changes leading to 1.0.2
1418Wednesday, August 19, 2015
1419====================================
1420
1421- Fix shaping with cluster-level > 0.
1422- Fix Uniscribe backend font-size scaling.
1423- Declare dependencies in harfbuzz.pc.
1424  FreeType is not declared though, to avoid bugs in pkg-config
1425  0.26 with recursive dependencies.
1426- Slightly improved debug infrastructure.  More to come later.
1427- Misc build fixes.
1428
1429
1430Overview of changes leading to 1.0.1
1431Monday, July 27, 2015
1432====================================
1433
1434- Fix out-of-bounds access in USE shaper.
1435
1436
1437Overview of changes leading to 1.0.0
1438Sunday, July 26, 2015
1439====================================
1440
1441- Implement Universal Shaping Engine:
1442  https://www.microsoft.com/typography/OpenTypeDev/USE/intro.htm
1443  http://blogs.windows.com/bloggingwindows/2015/02/23/windows-shapes-the-worlds-languages/
1444- Bump version to 1.0.0.  The soname was NOT bumped.
1445
1446
1447Overview of changes leading to 0.9.42
1448Thursday, July 26, 2015
1449=====================================
1450
1451- New API to allow for retrieving finer-grained cluster
1452  mappings if the client desires to handle them.  Default
1453  behavior is unchanged.
1454- Fix cluster merging when removing default-ignorables.
1455- Update to Unicode 8.0
1456- hb-graphite2 fixes.
1457- Misc fixes.
1458- Removed HB_NO_MERGE_CLUSTERS hack.
1459- New API:
1460  hb_buffer_cluster_level_t enum
1461  hb_buffer_get_cluster_level()
1462  hb_buffer_set_cluster_level()
1463  hb-shape / hb-view --cluster-level
1464
1465
1466Overview of changes leading to 0.9.41
1467Thursday, June 18, 2015
1468=====================================
1469
1470- Fix hb-coretext with trailing whitespace in right-to-left.
1471- New API: hb_buffer_reverse_range().
1472- Allow implementing atomic ops in config.h.
1473- Fix hb_language_t in language bindings.
1474- Misc fixes.
1475
1476
1477Overview of changes leading to 0.9.40
1478Friday, March 20, 2015
1479=====================================
1480
1481- Another hb-coretext crasher fix.  Ouch!
1482- Happy Norouz!
1483
1484
1485Overview of changes leading to 0.9.39
1486Wednesday, March 4, 2015
1487=====================================
1488
1489- Critical hb-coretext fixes.
1490- Optimizations and refactoring; no functional change
1491  expected.
1492- Misc build fixes.
1493
1494
1495Overview of changes leading to 0.9.38
1496Friday, January 23, 2015
1497=====================================
1498
1499- Fix minor out-of-bounds access in Indic shaper.
1500- Change New Tai Lue shaping engine from South-East Asian to default,
1501  reflecting change in Unicode encoding model.
1502- Add hb-shape --font-size.  Can take up to two numbers for separate
1503  x / y size.
1504- Fix CoreText and FreeType scale issues with negative scales.
1505- Reject blobs larger than 2GB.  This might break some icu-le-hb clients
1506  that need security fixes.  See:
1507  http://www.icu-project.org/trac/ticket/11450
1508- Avoid accessing font tables during face destruction, in casce rogue
1509  clients released face data already.
1510- Fix up gobject-introspection a bit.  Python bindings kinda working.
1511  See README.python.
1512- Misc fixes.
1513- API additions:
1514  hb_ft_face_create_referenced()
1515  hb_ft_font_create_referenced()
1516
1517
1518Overview of changes leading to 0.9.37
1519Wednesday, December 17, 2014
1520=====================================
1521
1522- Fix out-of-bounds access in Context lookup format 3.
1523- Indic: Allow ZWJ/ZWNJ before syllable modifiers.
1524
1525
1526Overview of changes leading to 0.9.36
1527Thursday, November 20, 2014
1528=====================================
1529
1530- First time that three months went by without a release since
1531  0.9.2 was released on August 10, 2012!
1532- Fix performance bug in hb_ot_collect_glyphs():
1533  https://bugzilla.mozilla.org/show_bug.cgi?id=1090869
1534- Add basic vertical-text support to hb-ot-font.
1535- Misc build fixes.
1536
1537
1538Overview of changes leading to 0.9.35
1539Saturday, August 13, 2014
1540=====================================
1541
1542- Fix major shape-plan caching bug when more than one shaper were
1543  provided to hb_shape_full() (as exercised by XeTeX).
1544  http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1246370.html
1545- Fix Arabic fallback shaping regression.  This was broken in 0.9.32.
1546- Major hb-coretext fixes.  That backend is complete now, including
1547  respecing buffer direction and language, down to vertical writing.
1548- Build fixes for Windows CE.  Should build fine now.
1549- Misc fixes:
1550  Use atexit() only if it's safe to call from shared library
1551  https://bugs.freedesktop.org/show_bug.cgi?id=82246
1552  Mandaic had errors in its Unicode Joining_Type
1553  https://bugs.freedesktop.org/show_bug.cgi?id=82306
1554- API changes:
1555
1556  * hb_buffer_clear_contents() does not reset buffer flags now.
1557
1558    After 763e5466c0a03a7c27020e1e2598e488612529a7, one doesn't
1559    need to set flags for different pieces of text.  The flags now
1560    are something the client sets up once, depending on how it
1561    actually uses the buffer.  As such, don't clear it in
1562    clear_contents().
1563
1564    I don't expect any changes to be needed to any existing client.
1565
1566
1567Overview of changes leading to 0.9.34
1568Saturday, August 2, 2014
1569=====================================
1570
1571- hb_feature_from_string() now accepts CSS font-feature-settings format.
1572- As a result, hb-shape / hb-view --features also accept CSS-style strings.
1573  Eg, "'liga' off" is accepted now.
1574- Add old-spec Myanmar shaper:
1575  https://bugs.freedesktop.org/show_bug.cgi?id=81775
1576- Don't apply 'calt' in Hangul shaper.
1577- Fix mark advance zeroing for Hebrew shaper:
1578  https://bugs.freedesktop.org/show_bug.cgi?id=76767
1579- Implement Windows-1256 custom Arabic shaping.  Only built on Windows,
1580  and requires help from get_glyph().  Used by Firefox.
1581  https://bugzilla.mozilla.org/show_bug.cgi?id=1045139
1582- Disable 'liga' in vertical text.
1583- Build fixes.
1584- API changes:
1585
1586  * Make HB_BUFFER_FLAG_BOT/EOT easier to use.
1587
1588    Previously, we expected users to provide BOT/EOT flags when the
1589    text *segment* was at paragraph boundaries.  This meant that for
1590    clients that provide full paragraph to HarfBuzz (eg. Pango), they
1591    had code like this:
1592
1593      hb_buffer_set_flags (hb_buffer,
1594                           (item_offset == 0 ? HB_BUFFER_FLAG_BOT : 0) |
1595                           (item_offset + item_length == paragraph_length ?
1596                            HB_BUFFER_FLAG_EOT : 0));
1597
1598      hb_buffer_add_utf8 (hb_buffer,
1599                          paragraph_text, paragraph_length,
1600                          item_offset, item_length);
1601
1602    After this change such clients can simply say:
1603
1604      hb_buffer_set_flags (hb_buffer,
1605                           HB_BUFFER_FLAG_BOT | HB_BUFFER_FLAG_EOT);
1606
1607      hb_buffer_add_utf8 (hb_buffer,
1608                          paragraph_text, paragraph_length,
1609                          item_offset, item_length);
1610
1611    Ie, HarfBuzz itself checks whether the segment is at the beginning/end
1612    of the paragraph.  Clients that only pass item-at-a-time to HarfBuzz
1613    continue not setting any flags whatsoever.
1614
1615    Another way to put it is: if there's pre-context text in the buffer,
1616    HarfBuzz ignores the BOT flag.  If there's post-context, it ignores
1617    EOT flag.
1618
1619
1620Overview of changes leading to 0.9.33
1621Tuesday, July 22, 2014
1622=====================================
1623
1624- Turn off ARabic 'cswh' feature that was accidentally turned on.
1625- Add HB_TAG_MAX_SIGNED.
1626- Make hb_face_make_immutable() really make face immutable!
1627- Windows build fixes.
1628
1629
1630Overview of changes leading to 0.9.32
1631Thursday, July 17, 2014
1632=====================================
1633
1634- Apply Arabic shaping features in spec order exactly.
1635- Another fix for Mongolian free variation selectors.
1636- For non-Arabic scripts in Arabic shaper apply 'rlig' and 'calt'
1637  together.
1638- Minor adjustment to U+FFFD logic.
1639- Fix hb-coretext build.
1640
1641
1642Overview of changes leading to 0.9.31
1643Wednesday, July 16, 2014
1644=====================================
1645
1646- Only accept valid UTF-8/16/32; we missed many cases before.
1647- Better shaping of invalid UTF-8/16/32.  Falls back to
1648  U+FFFD REPLACEMENT CHARACTER now.
1649- With all changes in this release, the buffer will contain fully
1650  valid Unicode after hb_buffer_add_utf8/16/32 no matter how
1651  broken the input is.  This can be overridden though.  See below.
1652- Fix Mongolian Variation Selectors for fonts without GDEF.
1653- Fix minor invalid buffer access.
1654- Accept zh-Hant and zh-Hans language tags.  hb_ot_tag_to_language()
1655  now uses these instead of private tags.
1656- Build fixes.
1657- New API:
1658  * hb_buffer_add_codepoints().  This does what hb_buffer_add_utf32()
1659    used to do, ie. no validity check on the input at all.  add_utf32
1660    now replaces invalid Unicode codepoints with the replacement
1661    character (see below).
1662  * hb_buffer_set_replacement_codepoint()
1663  * hb_buffer_get_replacement_codepoint()
1664    Previously, in hb_buffer_add_utf8 and hb_buffer_add_utf16, when
1665    we detected broken input, we replaced that with (hb_codepoint_t)-1.
1666    This has changed to use U+FFFD now, but can be changed using these
1667    new API.
1668
1669
1670Overview of changes leading to 0.9.30
1671Wednesday, July 9, 2014
1672=====================================
1673
1674- Update to Unicode 7.0.0:
1675  * New scripts Manichaean and Psalter Pahlavi are shaped using
1676    Arabic shaper.
1677  * All the other new scripts to through the generic shaper for
1678    now.
1679- Minor Indic improvements.
1680- Fix graphite2 backend cluster mapping [crasher!]
1681- API changes:
1682  * New HB_SCRIPT_* values for Unicode 7.0 scripts.
1683  * New function hb_ot_layout_language_get_required_feature().
1684- Build fixes.
1685
1686
1687Overview of changes leading to 0.9.29
1688Thursday, May 29, 2014
1689=====================================
1690
1691- Implement cmap in hb-ot-font.h.  No variation-selectors yet.
1692- Myanmar: Allow MedialYa+Asat.
1693- Various Indic fixes:
1694  * Support most characters in Extended Devanagary and Vedic
1695    Unicode blocks.
1696  * Allow digits and a some punctuation as consonant placeholders.
1697- Build fixes.
1698
1699
1700Overview of changes leading to 0.9.28
1701Monday, April 28, 2014
1702=====================================
1703
1704- Unbreak old-spec Indic shaping. (bug 76705)
1705- Fix shaping of U+17DD and U+0FC6.
1706- Add HB_NO_MERGE_CLUSTERS build option.  NOT to be enabled by default
1707  for shipping libraries.  It's an option for further experimentation
1708  right now.  When we are sure how to do it properly, we will add
1709  public run-time API for the functionality.
1710- Build fixes.
1711
1712
1713Overview of changes leading to 0.9.27
1714Tuesday, March 18, 2014
1715=====================================
1716
1717- Don't use "register" storage class specifier
1718- Wrap definition of free_langs() with HAVE_ATEXIT
1719- Add coretext_aat shaper and hb_coretext_face_create() constructor
1720- If HAVE_ICU_BUILTIN is defined, use hb-icu Unicode callbacks
1721- Add Myanmar test case from OpenType Myanmar spec
1722- Only do fallback Hebrew composition if no GPOS 'mark' available
1723- Allow bootstrapping without gtk-doc
1724- Use AM_MISSING_PROG for ragel and git
1725- Typo in ucdn's Makefile.am
1726- Improve MemoryBarrier() implementation
1727
1728
1729Overview of changes leading to 0.9.26
1730Thursday, January 30, 2014
1731=====================================
1732
1733- Misc fixes.
1734- Fix application of 'rtlm' feature.
1735- Automatically apply frac/numr/dnom around U+2044 FRACTION SLASH.
1736- New header: hb-ot-shape.h
1737- Uniscribe: fix scratch-buffer accounting.
1738- Reorder Tai Tham SAKOT to after tone-marks.
1739- Add Hangul shaper.
1740- New files:
1741  hb-ot-shape-complex-hangul.cc
1742  hb-ot-shape-complex-hebrew.cc
1743  hb-ot-shape-complex-tibetan.cc
1744- Disable 'cswh' feature in Arabic shaper.
1745- Coretext: better handle surrogate pairs.
1746- Add HB_TAG_MAX and _HB_SCRIPT_MAX_VALUE.
1747
1748
1749Overview of changes leading to 0.9.25
1750Wednesday, December 4, 2013
1751=====================================
1752
1753- Myanmar shaper improvements.
1754- Avoid font fallback in CoreText backend.
1755- Additional OpenType language tag mappiongs.
1756- More aggressive shape-plan caching.
1757- Build with / require automake 1.13.
1758- Build with libtool 2.4.2.418 alpha to support ppc64le.
1759
1760
1761Overview of changes leading to 0.9.24
1762Tuesday, November 13, 2013
1763=====================================
1764
1765- Misc compiler warning fixes with clang.
1766- No functional changes.
1767
1768
1769Overview of changes leading to 0.9.23
1770Monday, October 28, 2013
1771=====================================
1772
1773- "Udupi HarfBuzz Hackfest", Paris, October 14..18 2013.
1774- Fix (Chain)Context recursion with non-monotone lookup positions.
1775- Misc Indic bug fixes.
1776- New Javanese / Buginese shaping, similar to Windows 8.1.
1777
1778
1779Overview of changes leading to 0.9.22
1780Thursday, October 3, 2013
1781=====================================
1782
1783- Fix use-after-end-of-scope in hb_language_from_string().
1784- Fix hiding of default_ignorables if font doesn't have space glyph.
1785- Protect against out-of-range lookup indices.
1786
1787- API Changes:
1788
1789  * Added hb_ot_layout_table_get_lookup_count()
1790
1791
1792Overview of changes leading to 0.9.21
1793Monday, September 16, 2013
1794=====================================
1795
1796- Rename gobject-introspection library name from harfbuzz to HarfBuzz.
1797- Remove (long disabled) hb-old and hb-icu-le test shapers.
1798- Misc gtk-doc and gobject-introspection annotations.
1799- Misc fixes.
1800- API changes:
1801
1802  * Add HB_SET_VALUE_INVALID
1803
1804Overview of changes leading to 0.9.20
1805Thursday, August 29, 2013
1806=====================================
1807
1808General:
1809- Misc substitute_closure() fixes.
1810- Build fixes.
1811
1812Documentation:
1813- gtk-doc boilerplate integrated.  Docs are built now, but
1814  contain no contents.  By next release hopefully we have
1815  some content in.  Enable using --enable-gtk-doc.
1816
1817GObject and Introspection:
1818- Added harfbuzz-gobject library (hb-gobject.h) that has type
1819  bindings for all HarfBuzz objects and enums.  Enable using
1820  --with-gobject.
1821- Added gobject-introspection boilerplate.  Nothing useful
1822  right now.  Work in progress.  Gets enabled automatically if
1823  --with-gobject is used.  Override with --disable-introspection.
1824
1825OpenType shaper:
1826- Apply 'mark' in Myanmar shaper.
1827- Don't apply 'dlig' by default.
1828
1829Uniscribe shaper:
1830- Support user features.
1831- Fix loading of fonts that are also installed on the system.
1832- Fix shaping of Arabic Presentation Forms.
1833- Fix build with wide chars.
1834
1835CoreText shaper:
1836- Support user features.
1837
1838Source changes:
1839- hb_face_t code moved to hb-face.h / hb-face.cc.
1840- Added hb-deprecated.h.
1841
1842API changes:
1843- Added HB_DISABLE_DEPRECATED.
1844- Deprecated HB_SCRIPT_CANADIAN_ABORIGINAL; replaced by
1845  HB_SCRIPT_CANADIAN_SYLLABICS.
1846- Deprecated HB_BUFFER_FLAGS_DEFAULT; replaced by
1847  HB_BUFFER_FLAG_DEFAULT.
1848- Deprecated HB_BUFFER_SERIALIZE_FLAGS_DEFAULT; replaced by
1849  HB_BUFFER_SERIALIZE_FLAG_DEFAULT.
1850
1851
1852Overview of changes leading to 0.9.19
1853Tuesday, July 16, 2013
1854=====================================
1855
1856- Build fixes.
1857- Better handling of multiple variation selectors in a row.
1858- Pass on variation selector to GSUB if not consumed by cmap.
1859- Fix undefined memory access.
1860- Add Javanese config to Indic shaper.
1861- Misc bug fixes.
1862
1863Overview of changes leading to 0.9.18
1864Tuesday, May 28, 2013
1865=====================================
1866
1867New build system:
1868
1869- All unneeded code is all disabled by default,
1870
1871- Uniscribe and CoreText shapers can be enabled with their --with options,
1872
1873- icu_le and old shapers cannot be enabled for now,
1874
1875- glib, freetype, and cairo will be detected automatically.
1876  They can be force on/off'ed with their --with options,
1877
1878- icu and graphite2 are default off, can be enabled with their --with
1879  options,
1880
1881Moreover, ICU support is now build into a separate library:
1882libharfbuzz-icu.so, and a new harfbuzz-icu.pc is shipped for it.
1883Distros can enable ICU now without every application on earth
1884getting linked to via libharfbuzz.so.
1885
1886For distros I recommend that they make sure they are building --with-glib
1887--with-freetype --with-cairo, --with-icu, and optionally --with-graphite2;
1888And package harfbuzz and harfbuzz-icu separately.
1889
1890
1891Overview of changes leading to 0.9.17
1892Monday, May 20, 2013
1893=====================================
1894
1895- Build fixes.
1896- Fix bug in hb_set_get_min().
1897- Fix regression with Arabic mark positioning / width-zeroing.
1898
1899Overview of changes leading to 0.9.16
1900Friday, April 19, 2013
1901=====================================
1902
1903- Major speedup in OpenType lookup processing.  With the Amiri
1904  Arabic font, this release is over 3x faster than previous
1905  release.  All scripts / languages should see this speedup.
1906
1907- New --num-iterations option for hb-shape / hb-view; useful for
1908  profiling.
1909
1910Overview of changes leading to 0.9.15
1911Friday, April 05, 2013
1912=====================================
1913
1914- Build fixes.
1915- Fix crasher in graphite2 shaper.
1916- Fix Arabic mark width zeroing regression.
1917- Don't compose Hangul jamo into Unicode syllables.
1918
1919
1920Overview of changes leading to 0.9.14
1921Thursday, March 21, 2013
1922=====================================
1923
1924- Build fixes.
1925- Fix time-consuming sanitize with malicious fonts.
1926- Implement hb_buffer_deserialize_glyphs() for both json and text.
1927- Do not ignore Hangul filler characters.
1928- Indic fixes:
1929  * Fix Malayalam pre-base reordering interaction with post-forms.
1930  * Further adjust ZWJ handling.  Should fix known regressions from
1931    0.9.13.
1932
1933
1934Overview of changes leading to 0.9.13
1935Thursday, February 25, 2013
1936=====================================
1937
1938- Build fixes.
1939- Ngapi HarfBuzz Hackfest in London (February 2013):
1940  * Fixed all known Indic bugs,
1941  * New Win8-style Myanmar shaper,
1942  * New South-East Asian shaper for Tai Tham, Cham, and New Tai Lue,
1943  * Smartly ignore Default_Ignorable characters (joiners, etc) wheb
1944    matching GSUB/GPOS lookups,
1945  * Fix 'Phags-Pa U+A872 shaping,
1946  * Fix partial disabling of default-on features,
1947  * Allow disabling of TrueType kerning.
1948- Fix possible crasher with broken fonts with overlapping tables.
1949- Removed generated files from git again.  So, one needs ragel to
1950  bootstrap from the git tree.
1951
1952API changes:
1953- hb_shape() and related APIs now abort if buffer direction is
1954  HB_DIRECTION_INVALID.  Previously, hb_shape() was calling
1955  hb_buffer_guess_segment_properties() on the buffer before
1956  shaping.  The heuristics in that function are fragile.  If the
1957  user really wants the old behvaior, they can call that function
1958  right before calling hb_shape() to get the old behavior.
1959- hb_blob_create_sub_blob() always creates sub-blob with
1960  HB_MEMORY_MODE_READONLY.  See comments for the reason.
1961
1962
1963Overview of changes leading to 0.9.12
1964Thursday, January 18, 2013
1965=====================================
1966
1967- Build fixes for Sun compiler.
1968- Minor bug fix.
1969
1970Overview of changes leading to 0.9.11
1971Thursday, January 10, 2013
1972=====================================
1973
1974- Build fixes.
1975- Fix GPOS mark attachment with null Anchor offsets.
1976- [Indic] Fix old-spec reordering of viramas if sequence ends in one.
1977- Fix multi-threaded shaper data creation crash.
1978- Add atomic ops for Solaris.
1979
1980API changes:
1981- Rename hb_buffer_clear() to hb_buffer_clear_contents().
1982
1983
1984Overview of changes leading to 0.9.10
1985Thursday, January 3, 2013
1986=====================================
1987
1988- [Indic] Fixed rendering of Malayalam dot-reph
1989- Updated OT language tags.
1990- Updated graphite2 backend.
1991- Improved hb_ot_layout_get_size_params() logic.
1992- Improve hb-shape/hb-view help output.
1993- Fixed hb-set.h implementation to not crash.
1994- Fixed various issues with hb_ot_layout_collect_lookups().
1995- Various build fixes.
1996
1997New API:
1998
1999hb_graphite2_face_get_gr_face()
2000hb_graphite2_font_get_gr_font()
2001hb_coretext_face_get_cg_font()
2002
2003Modified API:
2004
2005hb_ot_layout_get_size_params()
2006
2007
2008Overview of changes leading to 0.9.9
2009Wednesday, December 5, 2012
2010====================================
2011
2012- Fix build on Windows.
2013- Minor improvements.
2014
2015
2016Overview of changes leading to 0.9.8
2017Tuesday, December 4, 2012
2018====================================
2019
2020
2021- Actually implement hb_shape_plan_get_shaper ().
2022- Make UCDB data tables const.
2023- Lots of internal refactoring in OTLayout tables.
2024- Flesh out hb_ot_layout_lookup_collect_glyphs().
2025
2026New API:
2027
2028hb_ot_layout_collect_lookups()
2029hb_ot_layout_get_size_params()
2030
2031
2032Overview of changes leading to 0.9.7
2033Sunday, November 21, 2012
2034====================================
2035
2036
2037HarfBuzz "All-You-Can-Eat-Sushi" (aka Vancouver) Hackfest and follow-on fixes.
2038
2039- Fix Arabic contextual joining using pre-context text.
2040- Fix Sinhala "split matra" mess.
2041- Fix Khmer shaping with broken fonts.
2042- Implement Thai "PUA" shaping for old fonts.
2043- Do NOT route Kharoshthi script through the Indic shaper.
2044- Disable fallback positioning for Indic and Thai shapers.
2045- Misc fixes.
2046
2047
2048hb-shape / hb-view changes:
2049
2050- Add --text-before and --text-after
2051- Add --bot / --eot / --preserve-default-ignorables
2052- hb-shape --output-format=json
2053
2054
2055New API:
2056
2057hb_buffer_clear()
2058
2059hb_buffer_flags_t
2060
2061HB_BUFFER_FLAGS_DEFAULT
2062HB_BUFFER_FLAG_BOT
2063HB_BUFFER_FLAG_EOT
2064HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES
2065
2066hb_buffer_set_flags()
2067hb_buffer_get_flags()
2068
2069HB_BUFFER_SERIALIZE_FLAGS
2070hb_buffer_serialize_glyphs()
2071hb_buffer_deserialize_glyphs()
2072hb_buffer_serialize_list_formats()
2073
2074hb_set_add_range()
2075hb_set_del_range()
2076hb_set_get_population()
2077hb_set_next_range()
2078
2079hb_face_[sg]et_glyph_count()
2080
2081hb_segment_properties_t
2082HB_SEGMENT_PROPERTIES_DEFAULT
2083hb_segment_properties_equal()
2084hb_segment_properties_hash()
2085
2086hb_buffer_set_segment_properties()
2087hb_buffer_get_segment_properties()
2088
2089hb_ot_layout_glyph_class_t
2090hb_ot_layout_get_glyph_class()
2091hb_ot_layout_get_glyphs_in_class()
2092
2093hb_shape_plan_t
2094hb_shape_plan_create()
2095hb_shape_plan_create_cached()
2096hb_shape_plan_get_empty()
2097hb_shape_plan_reference()
2098hb_shape_plan_destroy()
2099hb_shape_plan_set_user_data()
2100hb_shape_plan_get_user_data()
2101hb_shape_plan_execute()
2102hb_shape_plan_get_shaper()
2103
2104hb_ot_shape_plan_collect_lookups()
2105
2106
2107API changes:
2108
2109- Remove "mask" parameter from hb_buffer_add().
2110- Rename hb_ot_layout_would_substitute_lookup() and hb_ot_layout_substitute_closure_lookup().
2111- hb-set.h API const correction.
2112- Renamed hb_set_min/max() to hb_set_get_min/max().
2113- Rename hb_ot_layout_feature_get_lookup_indexes() to hb_ot_layout_feature_get_lookups().
2114- Rename hb_buffer_guess_properties() to hb_buffer_guess_segment_properties().
2115
2116
2117
2118Overview of changes leading to 0.9.6
2119Sunday, November 13, 2012
2120====================================
2121
2122- Don't clear pre-context text if no new context is provided.
2123- Fix ReverseChainingSubstLookup, which was totally borked.
2124- Adjust output format of hb-shape a bit.
2125- Include config.h.in in-tree.  Makes it easier for alternate build systems.
2126- Fix hb_buffer_set_length(buffer, 0) invalid memory allocation.
2127- Use ICU LayoutEngine's C API instead of C++.  Avoids much headache.
2128- Drop glyphs for all of Unicode Default_Ignorable characters.
2129- Misc build fixes.
2130
2131Arabic shaper:
2132- Enable 'dlig' and 'mset' features in Arabic shaper.
2133- Implement 'Phags-pa shaping, improve Mongolian.
2134
2135Indic shaper:
2136- Decompose Sinhala split matras the way old HarfBuzz / Pango did.
2137- Initial support for Consonant Medials.
2138- Start adding new-style Myanmar shaping.
2139- Make reph and 'pref' logic introspect the font.
2140- Route Meetei-Mayek through the Indic shaper.
2141- Don't apply 'liga' in Indic shaper.
2142- Improve Malayalam pre-base reordering Ra interaction with Chillus.
2143
2144
2145
2146Overview of changes leading to 0.9.5
2147Sunday, October 14, 2012
2148====================================
2149
2150- Synthetic-GSUB Arabic fallback shaping.
2151
2152- Misc Indic improvements.
2153
2154- Add build system support for pthread.
2155
2156- Imported UCDN for in-tree Unicode callbacks implementation.
2157
2158- Context-aware Arabic joining.
2159
2160- Misc other fixes.
2161
2162- New API:
2163
2164  hb_feature_to/from-string()
2165  hb_buffer_[sg]et_content_type()
2166
2167
2168
2169Overview of changes leading to 0.9.4
2170Tuesday, Sep 03, 2012
2171====================================
2172
2173- Indic improvements with old-spec Malayalam.
2174
2175- Better fallback glyph positioning, specially with Thai / Lao marks.
2176
2177- Implement dotted-circle insertion.
2178
2179- Better Arabic fallback shaping / ligation.
2180
2181- Added ICU LayoutEngine backend for testing.  Call it by the 'icu_le' name.
2182
2183- Misc fixes.
2184
2185
2186
2187Overview of changes leading to 0.9.3
2188Friday, Aug 18, 2012
2189====================================
2190
2191- Fixed fallback mark positioning for left-to-right text.
2192
2193- Improve mark positioning for the remaining combining classes.
2194
2195- Unbreak Thai and fallback Arabic shaping.
2196
2197- Port Arabic shaper to shape-plan caching.
2198
2199- Use new ICU normalizer functions.
2200
2201
2202
2203Overview of changes leading to 0.9.2
2204Friday, Aug 10, 2012
2205====================================
2206
2207- Over a thousand commits!  This is the first major release of HarfBuzz.
2208
2209- HarfBuzz is feature-complete now!  It should be in par, or better, than
2210  both Pango's shapers and old HarfBuzz / Qt shapers.
2211
2212- New Indic shaper, supporting main Indic scripts, Sinhala, and Khmer.
2213
2214- Improved Arabic shaper, with fallback Arabic shaping, supporting Arabic,
2215  Sinhala, N'ko, Mongolian, and Mandaic.
2216
2217- New Thai / Lao shaper.
2218
2219- Tibetan / Hangul support in the generic shaper.
2220
2221- Synthetic GDEF support for fonts without a GDEF table.
2222
2223- Fallback mark positioning for fonts without a GPOS table.
2224
2225- Unicode normalization shaping heuristic during glyph mapping.
2226
2227- New experimental Graphite2 backend.
2228
2229- New Uniscribe backend (primarily for testing).
2230
2231- New CoreText backend (primarily for testing).
2232
2233- Major optimization and speedup.
2234
2235- Test suites and testing infrastructure (work in progress).
2236
2237- Greatly improved hb-view cmdline tool.
2238
2239- hb-shape cmdline tool.
2240
2241- Unicode 6.1 support.
2242
2243Summary of API changes:
2244
2245o Changed API:
2246
2247  - Users are expected to only include main header files now (ie. hb.h,
2248    hb-glib.h, hb-ft.h, ...)
2249
2250  - All struct tag names had their initial underscore removed.
2251    Ie. "struct _hb_buffer_t" is "struct hb_buffer_t" now.
2252
2253  - All set_user_data() functions now take a "replace" boolean parameter.
2254
2255  - hb_buffer_create() takes zero arguments now.
2256    Use hb_buffer_pre_allocate() to pre-allocate.
2257
2258  - hb_buffer_add_utf*() now accept -1 for length parameteres,
2259    meaning "nul-terminated".
2260
2261  - hb_direction_t enum values changed.
2262
2263  - All *_from_string() APIs now take a length parameter to allow for
2264    non-nul-terminated strings. A -1 length means "nul-terminated".
2265
2266  - Typedef for hb_language_t changed.
2267
2268  - hb_get_table_func_t renamed to hb_reference_table_func_t.
2269
2270  - hb_ot_layout_table_choose_script()
2271
2272  - Various renames in hb-unicode.h.
2273
2274o New API:
2275
2276  - hb_buffer_guess_properties()
2277    Automatically called by hb_shape().
2278
2279  - hb_buffer_normalize_glyphs()
2280
2281  - hb_tag_from_string()
2282
2283  - hb-coretext.h
2284
2285  - hb-uniscribe.h
2286
2287  - hb_face_reference_blob()
2288  - hb_face_[sg]et_index()
2289  - hb_face_set_upem()
2290
2291  - hb_font_get_glyph_name_func_t
2292    hb_font_get_glyph_from_name_func_t
2293    hb_font_funcs_set_glyph_name_func()
2294    hb_font_funcs_set_glyph_from_name_func()
2295    hb_font_get_glyph_name()
2296    hb_font_get_glyph_from_name()
2297    hb_font_glyph_to_string()
2298    hb_font_glyph_from_string()
2299
2300  - hb_font_set_funcs_data()
2301
2302  - hb_ft_font_set_funcs()
2303  - hb_ft_font_get_face()
2304
2305  - hb-gobject.h (work in progress)
2306
2307  - hb_ot_shape_glyphs_closure()
2308    hb_ot_layout_substitute_closure_lookup()
2309
2310  - hb-set.h
2311
2312  - hb_shape_full()
2313
2314  - hb_unicode_combining_class_t
2315
2316  - hb_unicode_compose_func_t
2317    hb_unicode_decompose_func_t
2318    hb_unicode_decompose_compatibility_func_t
2319    hb_unicode_funcs_set_compose_func()
2320    hb_unicode_funcs_set_decompose_func()
2321    hb_unicode_funcs_set_decompose_compatibility_func()
2322    hb_unicode_compose()
2323    hb_unicode_decompose()
2324    hb_unicode_decompose_compatibility()
2325
2326o Removed API:
2327
2328  - hb_ft_get_font_funcs()
2329
2330  - hb_ot_layout_substitute_start()
2331    hb_ot_layout_substitute_lookup()
2332    hb_ot_layout_substitute_finish()
2333    hb_ot_layout_position_start()
2334    hb_ot_layout_position_lookup()
2335    hb_ot_layout_position_finish()
2336
2337
2338
2339Overview of changes leading to 0.6.0
2340Friday, May 27, 2011
2341====================================
2342
2343- Vertical text support in GPOS
2344- Almost all API entries have unit tests now, under test/
2345- All thread-safety issues are fixed
2346
2347Summary of API changes follows.
2348
2349
2350* Simple Types API:
2351
2352  o New API:
2353    HB_LANGUAGE_INVALID
2354    hb_language_get_default()
2355    hb_direction_to_string()
2356    hb_direction_from_string()
2357    hb_script_get_horizontal_direction()
2358    HB_UNTAG()
2359
2360  o Renamed API:
2361    hb_category_t renamed to hb_unicode_general_category_t
2362
2363  o Changed API:
2364    hb_language_t is a typed pointers now
2365
2366  o Removed API:
2367    HB_TAG_STR()
2368
2369
2370* Use ISO 15924 tags for hb_script_t:
2371
2372  o New API:
2373    hb_script_from_iso15924_tag()
2374    hb_script_to_iso15924_tag()
2375    hb_script_from_string()
2376
2377  o Changed API:
2378    HB_SCRIPT_* enum members changed value.
2379
2380
2381* Buffer API streamlined:
2382
2383  o New API:
2384    hb_buffer_reset()
2385    hb_buffer_set_length()
2386    hb_buffer_allocation_successful()
2387
2388  o Renamed API:
2389    hb_buffer_ensure() renamed to hb_buffer_pre_allocate()
2390    hb_buffer_add_glyph() renamed to hb_buffer_add()
2391
2392  o Removed API:
2393    hb_buffer_clear()
2394    hb_buffer_clear_positions()
2395
2396  o Changed API:
2397    hb_buffer_get_glyph_infos() takes an out length parameter now
2398    hb_buffer_get_glyph_positions() takes an out length parameter now
2399
2400
2401* Blob API streamlined:
2402
2403  o New API:
2404    hb_blob_get_data()
2405    hb_blob_get_data_writable()
2406
2407  o Renamed API:
2408    hb_blob_create_empty() renamed to hb_blob_get_empty()
2409
2410  o Removed API:
2411    hb_blob_lock()
2412    hb_blob_unlock()
2413    hb_blob_is_writable()
2414    hb_blob_try_writable()
2415
2416  o Changed API:
2417    hb_blob_create() takes user_data before destroy now
2418
2419
2420* Unicode functions API:
2421
2422  o Unicode function vectors can subclass other unicode function vectors now.
2423    Unimplemented callbacks in the subclass automatically chainup to the parent.
2424
2425  o All hb_unicode_funcs_t callbacks take a user_data now.  Their setters
2426    take a user_data and its respective destroy callback.
2427
2428  o New API:
2429    hb_unicode_funcs_get_empty()
2430    hb_unicode_funcs_get_default()
2431    hb_unicode_funcs_get_parent()
2432
2433  o Changed API:
2434    hb_unicode_funcs_create() now takes a parent_funcs.
2435
2436  o Removed func getter functions:
2437    hb_unicode_funcs_get_mirroring_func()
2438    hb_unicode_funcs_get_general_category_func()
2439    hb_unicode_funcs_get_script_func()
2440    hb_unicode_funcs_get_combining_class_func()
2441    hb_unicode_funcs_get_eastasian_width_func()
2442
2443
2444* Face API:
2445
2446  o Renamed API:
2447    hb_face_get_table() renamed to hb_face_reference_table()
2448    hb_face_create_for_data() renamed to hb_face_create()
2449
2450  o Changed API:
2451    hb_face_create_for_tables() takes user_data before destroy now
2452    hb_face_reference_table() returns empty blob instead of NULL
2453    hb_get_table_func_t accepts the face as first parameter now
2454
2455* Font API:
2456
2457  o Fonts can subclass other fonts now.  Unimplemented callbacks in the
2458    subclass automatically chainup to the parent.  When chaining up,
2459    scale is adjusted if the parent font has a different scale.
2460
2461  o All hb_font_funcs_t callbacks take a user_data now.  Their setters
2462    take a user_data and its respective destroy callback.
2463
2464  o New API:
2465    hb_font_get_parent()
2466    hb_font_funcs_get_empty()
2467    hb_font_create_sub_font()
2468
2469  o Removed API:
2470    hb_font_funcs_copy()
2471    hb_font_unset_funcs()
2472
2473  o Removed func getter functions:
2474    hb_font_funcs_get_glyph_func()
2475    hb_font_funcs_get_glyph_advance_func()
2476    hb_font_funcs_get_glyph_extents_func()
2477    hb_font_funcs_get_contour_point_func()
2478    hb_font_funcs_get_kerning_func()
2479
2480  o Changed API:
2481    hb_font_create() takes a face and references it now
2482    hb_font_set_funcs() takes user_data before destroy now
2483    hb_font_set_scale() accepts signed integers now
2484    hb_font_get_contour_point_func_t now takes glyph first, then point_index
2485    hb_font_get_glyph_func_t returns a success boolean now
2486
2487
2488* Changed object model:
2489
2490  o All object types have a _get_empty() now:
2491    hb_blob_get_empty()
2492    hb_buffer_get_empty()
2493    hb_face_get_empty()
2494    hb_font_get_empty()
2495    hb_font_funcs_get_empty()
2496    hb_unicode_funcs_get_empty()
2497
2498  o Added _set_user_data() and _get_user_data() for all object types:
2499    hb_blob_get_user_data()
2500    hb_blob_set_user_data()
2501    hb_buffer_get_user_data()
2502    hb_buffer_set_user_data()
2503    hb_face_get_user_data()
2504    hb_face_set_user_data()
2505    hb_font_funcs_get_user_data()
2506    hb_font_funcs_set_user_data()
2507    hb_font_get_user_data()
2508    hb_font_set_user_data()
2509    hb_unicode_funcs_get_user_data()
2510    hb_unicode_funcs_set_user_data()
2511
2512  o Removed the _get_reference_count() from all object types:
2513    hb_blob_get_reference_count()
2514    hb_buffer_get_reference_count()
2515    hb_face_get_reference_count()
2516    hb_font_funcs_get_reference_count()
2517    hb_font_get_reference_count()
2518    hb_unicode_funcs_get_reference_count()
2519
2520  o Added _make_immutable() and _is_immutable() for all object types except for buffer:
2521    hb_blob_make_immutable()
2522    hb_blob_is_immutable()
2523    hb_face_make_immutable()
2524    hb_face_is_immutable()
2525
2526
2527* Changed API for vertical text support
2528
2529  o The following callbacks where removed:
2530    hb_font_get_glyph_advance_func_t
2531    hb_font_get_kerning_func_t
2532
2533  o The following new callbacks added instead:
2534    hb_font_get_glyph_h_advance_func_t
2535    hb_font_get_glyph_v_advance_func_t
2536    hb_font_get_glyph_h_origin_func_t
2537    hb_font_get_glyph_v_origin_func_t
2538    hb_font_get_glyph_h_kerning_func_t
2539    hb_font_get_glyph_v_kerning_func_t
2540
2541  o The following API removed as such:
2542    hb_font_funcs_set_glyph_advance_func()
2543    hb_font_funcs_set_kerning_func()
2544    hb_font_get_glyph_advance()
2545    hb_font_get_kerning()
2546
2547  o New API added instead:
2548    hb_font_funcs_set_glyph_h_advance_func()
2549    hb_font_funcs_set_glyph_v_advance_func()
2550    hb_font_funcs_set_glyph_h_origin_func()
2551    hb_font_funcs_set_glyph_v_origin_func()
2552    hb_font_funcs_set_glyph_h_kerning_func()
2553    hb_font_funcs_set_glyph_v_kerning_func()
2554    hb_font_get_glyph_h_advance()
2555    hb_font_get_glyph_v_advance()
2556    hb_font_get_glyph_h_origin()
2557    hb_font_get_glyph_v_origin()
2558    hb_font_get_glyph_h_kerning()
2559    hb_font_get_glyph_v_kerning()
2560
2561  o The following higher-leve API added for convenience:
2562    hb_font_get_glyph_advance_for_direction()
2563    hb_font_get_glyph_origin_for_direction()
2564    hb_font_add_glyph_origin_for_direction()
2565    hb_font_subtract_glyph_origin_for_direction()
2566    hb_font_get_glyph_kerning_for_direction()
2567    hb_font_get_glyph_extents_for_origin()
2568    hb_font_get_glyph_contour_point_for_origin()
2569
2570
2571* OpenType Layout API:
2572
2573  o New API:
2574    hb_ot_layout_position_start()
2575    hb_ot_layout_substitute_start()
2576    hb_ot_layout_substitute_finish()
2577
2578
2579* Glue code:
2580
2581  o New API:
2582    hb_glib_script_to_script()
2583    hb_glib_script_from_script()
2584    hb_icu_script_to_script()
2585    hb_icu_script_from_script()
2586
2587
2588* Version API added:
2589
2590  o New API:
2591    HB_VERSION_MAJOR
2592    HB_VERSION_MINOR
2593    HB_VERSION_MICRO
2594    HB_VERSION_STRING
2595    HB_VERSION_CHECK()
2596    hb_version()
2597    hb_version_string()
2598    hb_version_check()
2599
2600
2601