1 Overview of changes leading to 1.4.6
3 ====================================
5 - Graphite2: Fix RTL positioning issue.
6 - Backlist GDEF of more versions of Padauk and Tahoma.
7 - New, experimental, cmake alternative build system.
10 Overview of changes leading to 1.4.5
11 Friday, March 10, 2017
12 ====================================
14 - Revert "Fix Context lookup application when moving back after a glyph..."
15 This introduced memory access problems. To be fixed properly soon.
18 Overview of changes leading to 1.4.4
20 ====================================
22 - Fix Context lookup application when moving back after a glyph deletion.
23 - Fix buffer-overrun in Bengali.
26 Overview of changes leading to 1.4.3
27 Saturday, February 25, 2017
28 ====================================
30 - Route Adlam script to Arabic shaper.
35 hb_graphite2_font_get_gr_font()
38 Overview of changes leading to 1.4.2
39 Monday, January 23, 2017
40 ====================================
42 - Implement OpenType Font Variation tables avar/fvar/HVAR/VVAR.
43 - hb-shape and hb-view now accept --variations.
47 hb_variation_from_string()
48 hb_variation_to_string()
50 hb_font_set_variations()
51 hb_font_set_var_coords_design()
52 hb_font_get_var_coords_normalized()
57 hb_ot_var_get_axis_count()
60 hb_ot_var_normalize_variations()
61 hb_ot_var_normalize_coords()
63 - MVAR to be implemented later. Access to named instances to be
64 implemented later as well.
69 Overview of changes leading to 1.4.1
70 Thursday, January 5, 2017
71 ====================================
73 - Always build and use UCDN for Unicode data by default.
74 Reduces dependence on version of Unicode data in glib,
75 specially in the Windows bundles we are shipping, which
79 Overview of changes leading to 1.4.0
80 Thursday, January 5, 2017
81 ====================================
83 - Merged "OpenType GX" branch which adds core of support for
84 OpenType 1.8 Font Variations. To that extent, the relevant
88 hb_font_set_var_coords_normalized()
93 HB_OT_LAYOUT_NO_VARIATIONS_INDEX
94 hb_ot_layout_table_find_feature_variations()
95 hb_ot_layout_feature_with_variations_get_lookups()
96 hb_shape_plan_create2()
97 hb_shape_plan_create_cached2()
99 Currently variations in GSUB/GPOS/GDEF are fully supported,
100 and no other tables are supported. In particular, fvar/avar
101 are NOT supported, hence the hb_font_set_var_coords_normalized()
102 taking normalized coordinates. API to take design coordinates
103 will be added in the future.
105 HVAR/VVAR/MVAR support will also be added to hb-ot-font in the
108 - Fix regression in GDEF glyph class processing.
109 - Add decompositions for Chakma, Limbu, and Balinese in USE shaper.
113 Overview of changes leading to 1.3.4
114 Monday, December 5, 2016
115 ====================================
117 - Fix vertical glyph origin in hb-ot-font.
118 - Implement CBDT/CBLC color font glyph extents in hb-ot-font.
121 Overview of changes leading to 1.3.3
122 Wednesday, September 28, 2016
123 ====================================
125 - Implement parsing of OpenType MATH table.
129 hb_ot_math_constant_t
131 hb_ot_math_glyph_variant_t
132 hb_ot_math_glyph_part_flags_t
133 hb_ot_math_glyph_part_t
135 hb_ot_math_get_constant
136 hb_ot_math_get_glyph_italics_correction
137 hb_ot_math_get_glyph_top_accent_attachment
138 hb_ot_math_get_glyph_kerning
139 hb_ot_math_is_glyph_extended_shape
140 hb_ot_math_get_glyph_variants
141 hb_ot_math_get_min_connector_overlap
142 hb_ot_math_get_glyph_assembly
145 Overview of changes leading to 1.3.2
146 Wednesday, September 27, 2016
147 ====================================
149 - Fix build of hb-coretext on older OS X versions.
152 Overview of changes leading to 1.3.1
153 Wednesday, September 7, 2016
154 ====================================
156 - Blacklist bad GDEF of more fonts (Padauk).
157 - More CoreText backend crash fixes with OS X 10.9.5.
161 Overview of changes leading to 1.3.0
162 Thursday, July 21, 2016
163 ====================================
165 - Update to Unicode 9.0.0
166 - Move Javanese from Indic shaper to Universal Shaping Engine.
167 - Allow MultipleSubst to delete a glyph (matching Windows engine).
168 - Update Universal Shaping Engine to latest draft from Microsoft.
169 - DirectWrite backend improvements. Note: this backend is for testing ONLY.
170 - CoreText backend improvements with unreachable fonts.
171 - Implement symbol fonts (cmap 3.0.0) in hb-ft and hb-ot-font.
172 - Blacklist bad GDEF of more fonts (Tahoma & others).
176 Overview of changes leading to 1.2.7
178 ====================================
180 - Blacklist another version of Times New Roman (Bold) Italic from Windows 7.
181 - Fix Mongolian Free Variation Selectors shaping with certain fonts.
182 - Fix Tibetan shorthand contractions shaping.
183 - Improved list of language tag mappings.
184 - Unbreak build on Windows CE.
185 - Make 'glyf' table loading lazy in hb-ot-font.
188 Overview of changes leading to 1.2.6
189 Friday, April 8, 2016
190 ====================================
192 - Blacklist GDEF table of another set of Times New Roman (Bold) Italic.
193 - DirectWrite backend improvements. Note: DirectWrite backend is
194 exclusively for our internal testing and should NOT be used in any
195 production system whatsoever.
198 Overview of changes leading to 1.2.5
199 Monday, April 4, 2016
200 ====================================
202 - Fix GDEF mark-filtering-set, which was broken in 1.2.3.
205 Overview of changes leading to 1.2.4
206 Thursday, March 17, 2016
207 ====================================
209 - Synthesize GDEF glyph class for any glyph that does not have one in GDEF.
210 I really hope we don't discover broken fonts that shape badly with this
212 - Misc build and other minor fixes.
214 - Added HB_NDEBUG. It's fine for production systems to define this to
215 disable high-overhead debugging checks. However, I also reduced the
216 overhead of those checks, so it's a non-issue right now. You can
217 forget it. Just not defining anything at all is fine.
220 Overview of changes leading to 1.2.3
221 Thursday, February 25, 2016
222 ====================================
224 - Blacklist GDEF table of certain versions of Times New Roman (Bold) Italic,
225 due to bug in glyph class of ASCII double-quote character. This should
226 address "regression" introduced in 1.2.0 when we switched mark zeroing
227 in most shapers from BY_UNICODE_LATE to BY_GDEF_LATE.
228 This fourth release in a week should finally stablize things...
230 - hb-ot-font's get_glyph() implementation saw some optimizations. Though,
231 might be really hard to measure in real-world situations.
233 - Also, two rather small API changes:
235 We now disable some time-consuming internal bookkeeping if built with NDEBUG
236 defined. This is a first time that we use NDEBUG to disable debug code. If
237 there exist production systems that do NOT want to enable NDEBUG, please let
238 me know and I'll add HB_NDEBUG.
240 Added get_nominal_glyph() and get_variation_glyph() instead of get_glyph()
243 - hb_font_get_nominal_glyph_func_t
244 - hb_font_get_variation_glyph_func_t
245 - hb_font_funcs_set_nominal_glyph_func()
246 - hb_font_funcs_set_variation_glyph_func()
247 - hb_font_get_nominal_glyph()
248 - hb_font_get_variation_glyph()
251 - hb_font_get_glyph_func_t
252 - hb_font_funcs_set_glyph_func()
254 Clients that implement their own font-funcs are encouraged to replace
255 their get_glyph() implementation with a get_nominal_glyph() and
256 get_variation_glyph() pair. The variation version can assume that
257 variation_selector argument is not zero. Old (deprecated) functions
258 will continue working indefinitely using internal gymnastics; it is
259 just more efficient to use the new functions.
262 Overview of changes leading to 1.2.2
263 Wednesday, February 24, 2016
264 ====================================
266 - Fix regression with mark positioning with fonts that have
267 non-zero mark advances. This was introduced in 1.2.0 while
268 trying to make mark and cursive attachments to work together.
269 I have partially reverted that, so this version is much more
270 like what we had before. All clients who updated to 1.2.0
271 should update to this version.
274 Overview of changes leading to 1.2.1
275 Tuesday, February 23, 2016
276 ====================================
278 - CoreText: Fix bug with wrong scale if font scale was changed later.
279 https://github.com/libass/libass/issues/212
280 - CoreText: Drastically speed up font initialization.
281 - CoreText: Fix tiny leak.
282 - Group ZWJ/ZWNJ with previous syllable under cluster-level=0.
283 https://github.com/behdad/harfbuzz/issues/217
284 - Add test/shaping/README.md about how to add tests to the suite.
287 Overview of changes leading to 1.2.0
288 Friday, February 19, 2016
289 ====================================
291 - Fix various issues (hangs mostly) in case of memory allocation failure.
292 - Change mark zeroing types of most shapers from BY_UNICODE_LATE to
293 BY_GDEF_LATE. This seems to be what Uniscribe does.
294 - Change mark zeroing of USE shaper from NONE to BY_GDEF_EARLY. That's
296 - Allow GPOS cursive connection on marks, and fix the interaction with
297 mark attachment. This work resulted in some changes to how mark
298 attachments work. See:
299 https://github.com/behdad/harfbuzz/issues/211
300 https://github.com/behdad/harfbuzz/commit/86c68c7a2c971efe8e35b1f1bd99401dc8b688d2
301 - Graphite2 shaper: improved negative advance handling (eg. Nastaliq).
302 - Add nmake-based build system for Windows.
304 - Misc. improvements.
307 Overview of changes leading to 1.1.3
308 Monday, January 11, 2016
309 ====================================
311 - Ported Indic shaper to Unicode 8.0 data.
312 - Universal Shaping Engine fixes.
313 - Speed up CoreText shaper when font fallback happens in CoreText.
314 - Documentation improvements, thanks to Khaled Hosny.
315 - Very rough directwrite shaper for testing, thanks to Ebrahim Byagowi.
321 hb_font_get_font_extents_func_t
322 hb_font_get_font_h_extents_func_t
323 hb_font_get_font_v_extents_func_t
324 hb_font_funcs_set_font_h_extents_func
325 hb_font_funcs_set_font_v_extents_func
326 hb_font_get_h_extents
327 hb_font_get_v_extents
328 hb_font_get_extents_for_direction
330 * Buffer message (aka debug):
331 hb_buffer_message_func_t
332 hb_buffer_set_message_func()
333 Actual message protocol to be fleshed out later.
336 Overview of changes leading to 1.1.2
337 Wednesday, November 26, 2015
338 ====================================
340 - Fix badly-broken fallback shaper that affected terminology.
341 https://github.com/behdad/harfbuzz/issues/187
342 - Fix y_scaling in Graphite shaper.
344 * An unset glyph_h_origin() function in font-funcs now (sensibly)
345 implies horizontal origin at 0,0. Ie, the nil callback returns
346 true instead of false. As such, implementations that have a
347 glyph_h_origin() that simply returns true, can remove that function
348 with HarfBuzz >= 1.1.2. This results in a tiny speedup.
351 Overview of changes leading to 1.1.1
352 Wednesday, November 24, 2015
353 ====================================
355 - Build fixes, specially for hb-coretext.
358 Overview of changes leading to 1.1.0
359 Wednesday, November 18, 2015
360 ====================================
362 - Implement 'stch' stretch feature for Syriac Abbreviation Mark.
363 https://github.com/behdad/harfbuzz/issues/141
364 - Disable use of decompose_compatibility() callback.
365 - Implement "shaping" of various Unicode space characters, even
366 if the font does not support them.
367 https://github.com/behdad/harfbuzz/issues/153
368 - If font does not support U+2011 NO-BREAK HYPHEN, fallback to
370 - Changes resulting from libFuzzer continuous fuzzing:
371 * Reject font tables that need more than 8 edits,
372 * Bound buffer growth during shaping to 32x,
373 * Fix assertions and other issues at OOM / buffer max-growth.
374 - Misc fixes and optimizations.
376 * All fonts created with hb_font_create() now inherit from
377 (ie. have parent) hb_font_get_empty().
380 Overview of changes leading to 1.0.6
381 Thursday, October 15, 2015
382 ====================================
384 - Reduce max nesting level in OT lookups from 8 to 6.
385 Should not affect any real font as far as I know.
386 - Fix memory access issue in ot-font.
387 - Revert default load-flags of fonts created using hb_ft_font_create()
388 back to FT_LOAD_DEFAULT|FT_LOAD_NO_HINTING. This was changed in
389 last release (1.0.5), but caused major issues, so revert.
390 https://github.com/behdad/harfbuzz/issues/143
393 Overview of changes leading to 1.0.5
394 Tuesday, October 13, 2015
395 ====================================
397 - Fix multiple memory access bugs discovered using libFuzzer.
398 https://github.com/behdad/harfbuzz/issues/139
399 Everyone should upgrade to this version as soon as possible.
400 We now have continuous fuzzing set up, to avoid issues like
401 these creeping in again.
405 * hb_font_set_parent().
406 * hb_ft_font_[sg]et_load_flags()
407 The default flags for fonts created using hb_ft_font_create()
408 has changed to default to FT_LOAD_DEFAULT now. Previously it
409 was defaulting to FT_LOAD_DFEAULT|FT_LOAD_NO_HINTING.
412 * Fonts now default to units-per-EM as their scale, instead of 0.
413 * hb_font_create_sub_font() does NOT make parent font immutable
414 anymore. hb_font_make_immutable() does.
417 Overview of changes leading to 1.0.4
418 Wednesday, September 30, 2015
419 ====================================
421 - Fix minor out-of-bounds read error.
424 Overview of changes leading to 1.0.3
425 Tuesday, September 1, 2015
426 ====================================
428 - Start of user documentation, from Simon Cozens!
429 - Implement glyph_extents() for TrueType fonts in hb-ot-font.
430 - Improve GPOS cursive attachments with conflicting lookups.
431 - More fixes for cluster-level = 1.
432 - Uniscribe positioning fix.
435 Overview of changes leading to 1.0.2
436 Wednesday, August 19, 2015
437 ====================================
439 - Fix shaping with cluster-level > 0.
440 - Fix Uniscribe backend font-size scaling.
441 - Declare dependencies in harfbuzz.pc.
442 FreeType is not declared though, to avoid bugs in pkg-config
443 0.26 with recursive dependencies.
444 - Slightly improved debug infrastructure. More to come later.
448 Overview of changes leading to 1.0.1
449 Monday, July 27, 2015
450 ====================================
452 - Fix out-of-bounds access in USE shaper.
455 Overview of changes leading to 1.0.0
456 Sunday, July 26, 2015
457 ====================================
459 - Implement Universal Shaping Engine:
460 https://www.microsoft.com/typography/OpenTypeDev/USE/intro.htm
461 http://blogs.windows.com/bloggingwindows/2015/02/23/windows-shapes-the-worlds-languages/
462 - Bump version to 1.0.0. The soname was NOT bumped.
465 Overview of changes leading to 0.9.42
466 Thursday, July 26, 2015
467 =====================================
469 - New API to allow for retrieving finer-grained cluster
470 mappings if the client desires to handle them. Default
471 behavior is unchanged.
472 - Fix cluster merging when removing default-ignorables.
473 - Update to Unicode 8.0
474 - hb-graphite2 fixes.
476 - Removed HB_NO_MERGE_CLUSTERS hack.
478 hb_buffer_cluster_level_t enum
479 hb_buffer_get_cluster_level()
480 hb_buffer_set_cluster_level()
481 hb-shape / hb-view --cluster-level
484 Overview of changes leading to 0.9.41
485 Thursday, June 18, 2015
486 =====================================
488 - Fix hb-coretext with trailing whitespace in right-to-left.
489 - New API: hb_buffer_reverse_range().
490 - Allow implementing atomic ops in config.h.
491 - Fix hb_language_t in language bindings.
495 Overview of changes leading to 0.9.40
496 Friday, March 20, 2015
497 =====================================
499 - Another hb-coretext crasher fix. Ouch!
503 Overview of changes leading to 0.9.39
504 Wednesday, March 4, 2015
505 =====================================
507 - Critical hb-coretext fixes.
508 - Optimizations and refactoring; no functional change
513 Overview of changes leading to 0.9.38
514 Friday, January 23, 2015
515 =====================================
517 - Fix minor out-of-bounds access in Indic shaper.
518 - Change New Tai Lue shaping engine from South-East Asian to default,
519 reflecting change in Unicode encoding model.
520 - Add hb-shape --font-size. Can take up to two numbers for separate
522 - Fix CoreText and FreeType scale issues with negative scales.
523 - Reject blobs larger than 2GB. This might break some icu-le-hb clients
524 that need security fixes. See:
525 http://www.icu-project.org/trac/ticket/11450
526 - Avoid accessing font tables during face destruction, in casce rogue
527 clients released face data already.
528 - Fix up gobject-introspection a bit. Python bindings kinda working.
532 hb_ft_face_create_referenced()
533 hb_ft_font_create_referenced()
536 Overview of changes leading to 0.9.37
537 Wednesday, December 17, 2014
538 =====================================
540 - Fix out-of-bounds access in Context lookup format 3.
541 - Indic: Allow ZWJ/ZWNJ before syllable modifiers.
544 Overview of changes leading to 0.9.36
545 Thursday, November 20, 2014
546 =====================================
548 - First time that three months went by without a release since
549 0.9.2 was released on August 10, 2012!
550 - Fix performance bug in hb_ot_collect_glyphs():
551 https://bugzilla.mozilla.org/show_bug.cgi?id=1090869
552 - Add basic vertical-text support to hb-ot-font.
556 Overview of changes leading to 0.9.35
557 Saturday, August 13, 2014
558 =====================================
560 - Fix major shape-plan caching bug when more than one shaper were
561 provided to hb_shape_full() (as exercised by XeTeX).
562 http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1246370.html
563 - Fix Arabic fallback shaping regression. This was broken in 0.9.32.
564 - Major hb-coretext fixes. That backend is complete now, including
565 respecing buffer direction and language, down to vertical writing.
566 - Build fixes for Windows CE. Should build fine now.
568 Use atexit() only if it's safe to call from shared library
569 https://bugs.freedesktop.org/show_bug.cgi?id=82246
570 Mandaic had errors in its Unicode Joining_Type
571 https://bugs.freedesktop.org/show_bug.cgi?id=82306
574 * hb_buffer_clear_contents() does not reset buffer flags now.
576 After 763e5466c0a03a7c27020e1e2598e488612529a7, one doesn't
577 need to set flags for different pieces of text. The flags now
578 are something the client sets up once, depending on how it
579 actually uses the buffer. As such, don't clear it in
582 I don't expect any changes to be needed to any existing client.
585 Overview of changes leading to 0.9.34
586 Saturday, August 2, 2014
587 =====================================
589 - hb_feature_from_string() now accepts CSS font-feature-settings format.
590 - As a result, hb-shape / hb-view --features also accept CSS-style strings.
591 Eg, "'liga' off" is accepted now.
592 - Add old-spec Myanmar shaper:
593 https://bugs.freedesktop.org/show_bug.cgi?id=81775
594 - Don't apply 'calt' in Hangul shaper.
595 - Fix mark advance zeroing for Hebrew shaper:
596 https://bugs.freedesktop.org/show_bug.cgi?id=76767
597 - Implement Windows-1256 custom Arabic shaping. Only built on Windows,
598 and requires help from get_glyph(). Used by Firefox.
599 https://bugzilla.mozilla.org/show_bug.cgi?id=1045139
600 - Disable 'liga' in vertical text.
604 * Make HB_BUFFER_FLAG_BOT/EOT easier to use.
606 Previously, we expected users to provide BOT/EOT flags when the
607 text *segment* was at paragraph boundaries. This meant that for
608 clients that provide full paragraph to HarfBuzz (eg. Pango), they
611 hb_buffer_set_flags (hb_buffer,
612 (item_offset == 0 ? HB_BUFFER_FLAG_BOT : 0) |
613 (item_offset + item_length == paragraph_length ?
614 HB_BUFFER_FLAG_EOT : 0));
616 hb_buffer_add_utf8 (hb_buffer,
617 paragraph_text, paragraph_length,
618 item_offset, item_length);
620 After this change such clients can simply say:
622 hb_buffer_set_flags (hb_buffer,
623 HB_BUFFER_FLAG_BOT | HB_BUFFER_FLAG_EOT);
625 hb_buffer_add_utf8 (hb_buffer,
626 paragraph_text, paragraph_length,
627 item_offset, item_length);
629 Ie, HarfBuzz itself checks whether the segment is at the beginning/end
630 of the paragraph. Clients that only pass item-at-a-time to HarfBuzz
631 continue not setting any flags whatsoever.
633 Another way to put it is: if there's pre-context text in the buffer,
634 HarfBuzz ignores the BOT flag. If there's post-context, it ignores
638 Overview of changes leading to 0.9.33
639 Tuesday, July 22, 2014
640 =====================================
642 - Turn off ARabic 'cswh' feature that was accidentally turned on.
643 - Add HB_TAG_MAX_SIGNED.
644 - Make hb_face_make_immutable() really make face immutable!
645 - Windows build fixes.
648 Overview of changes leading to 0.9.32
649 Thursday, July 17, 2014
650 =====================================
652 - Apply Arabic shaping features in spec order exactly.
653 - Another fix for Mongolian free variation selectors.
654 - For non-Arabic scripts in Arabic shaper apply 'rlig' and 'calt'
656 - Minor adjustment to U+FFFD logic.
657 - Fix hb-coretext build.
660 Overview of changes leading to 0.9.31
661 Wednesday, July 16, 2014
662 =====================================
664 - Only accept valid UTF-8/16/32; we missed many cases before.
665 - Better shaping of invalid UTF-8/16/32. Falls back to
666 U+FFFD REPLACEMENT CHARACTER now.
667 - With all changes in this release, the buffer will contain fully
668 valid Unicode after hb_buffer_add_utf8/16/32 no matter how
669 broken the input is. This can be overriden though. See below.
670 - Fix Mongolian Variation Selectors for fonts without GDEF.
671 - Fix minor invalid buffer access.
672 - Accept zh-Hant and zh-Hans language tags. hb_ot_tag_to_language()
673 now uses these instead of private tags.
676 * hb_buffer_add_codepoints(). This does what hb_buffer_add_utf32()
677 used to do, ie. no validity check on the input at all. add_utf32
678 now replaces invalid Unicode codepoints with the replacement
679 character (see below).
680 * hb_buffer_set_replacement_codepoint()
681 * hb_buffer_get_replacement_codepoint()
682 Previously, in hb_buffer_add_utf8 and hb_buffer_add_utf16, when
683 we detected broken input, we replaced that with (hb_codepoint_t)-1.
684 This has changed to use U+FFFD now, but can be changed using these
688 Overview of changes leading to 0.9.30
689 Wednesday, July 9, 2014
690 =====================================
692 - Update to Unicode 7.0.0:
693 * New scripts Manichaean and Psalter Pahlavi are shaped using
695 * All the other new scripts to through the generic shaper for
697 - Minor Indic improvements.
698 - Fix graphite2 backend cluster mapping [crasher!]
700 * New HB_SCRIPT_* values for Unicode 7.0 scripts.
701 * New function hb_ot_layout_language_get_required_feature().
705 Overview of changes leading to 0.9.29
706 Thursday, May 29, 2014
707 =====================================
709 - Implement cmap in hb-ot-font.h. No variation-selectors yet.
710 - Myanmar: Allow MedialYa+Asat.
711 - Various Indic fixes:
712 * Support most characters in Extended Devanagary and Vedic
714 * Allow digits and a some punctuation as consonant placeholders.
718 Overview of changes leading to 0.9.28
719 Monday, April 28, 2014
720 =====================================
722 - Unbreak old-spec Indic shaping. (bug 76705)
723 - Fix shaping of U+17DD and U+0FC6.
724 - Add HB_NO_MERGE_CLUSTERS build option. NOT to be enabled by default
725 for shipping libraries. It's an option for further experimentation
726 right now. When we are sure how to do it properly, we will add
727 public run-time API for the functionality.
731 Overview of changes leading to 0.9.27
732 Tuesday, March 18, 2014
733 =====================================
735 - Don't use "register" storage class specifier
736 - Wrap definition of free_langs() with HAVE_ATEXIT
737 - Add coretext_aat shaper and hb_coretext_face_create() constructor
738 - If HAVE_ICU_BUILTIN is defined, use hb-icu Unicode callbacks
739 - Add Myanmar test case from OpenType Myanmar spec
740 - Only do fallback Hebrew composition if no GPOS 'mark' available
741 - Allow bootstrapping without gtk-doc
742 - Use AM_MISSING_PROG for ragel and git
743 - Typo in ucdn's Makefile.am
744 - Improve MemoryBarrier() implementation
747 Overview of changes leading to 0.9.26
748 Thursday, January 30, 2014
749 =====================================
752 - Fix application of 'rtlm' feature.
753 - Automatically apply frac/numr/dnom around U+2044 FRACTION SLASH.
754 - New header: hb-ot-shape.h
755 - Uniscribe: fix scratch-buffer accounting.
756 - Reorder Tai Tham SAKOT to after tone-marks.
759 hb-ot-shape-complex-hangul.cc
760 hb-ot-shape-complex-hebrew.cc
761 hb-ot-shape-complex-tibetan.cc
762 - Disable 'cswh' feature in Arabic shaper.
763 - Coretext: better handle surrogate pairs.
764 - Add HB_TAG_MAX and _HB_SCRIPT_MAX_VALUE.
767 Overview of changes leading to 0.9.25
768 Wednesday, December 4, 2013
769 =====================================
771 - Myanmar shaper improvements.
772 - Avoid font fallback in CoreText backend.
773 - Additional OpenType language tag mappiongs.
774 - More aggressive shape-plan caching.
775 - Build with / require automake 1.13.
776 - Build with libtool 2.4.2.418 alpha to support ppc64le.
779 Overview of changes leading to 0.9.24
780 Tuesday, November 13, 2013
781 =====================================
783 - Misc compiler warning fixes with clang.
784 - No functional changes.
787 Overview of changes leading to 0.9.23
788 Monday, October 28, 2013
789 =====================================
791 - "Udupi HarfBuzz Hackfest", Paris, October 14..18 2013.
792 - Fix (Chain)Context recursion with non-monotone lookup positions.
793 - Misc Indic bug fixes.
794 - New Javanese / Buginese shaping, similar to Windows 8.1.
797 Overview of changes leading to 0.9.22
798 Thursday, October 3, 2013
799 =====================================
801 - Fix use-after-end-of-scope in hb_language_from_string().
802 - Fix hiding of default_ignorables if font doesn't have space glyph.
803 - Protect against out-of-range lookup indices.
807 * Added hb_ot_layout_table_get_lookup_count()
810 Overview of changes leading to 0.9.21
811 Monday, September 16, 2013
812 =====================================
814 - Rename gobject-introspection library name from harfbuzz to HarfBuzz.
815 - Remove (long disabled) hb-old and hb-icu-le test shapers.
816 - Misc gtk-doc and gobject-introspection annotations.
820 * Add HB_SET_VALUE_INVALID
822 Overview of changes leading to 0.9.20
823 Thursday, August 29, 2013
824 =====================================
827 - Misc substitute_closure() fixes.
831 - gtk-doc boilerplate integrated. Docs are built now, but
832 contain no contents. By next release hopefully we have
833 some content in. Enable using --enable-gtk-doc.
835 GObject and Introspection:
836 - Added harfbuzz-gobject library (hb-gobject.h) that has type
837 bindings for all HarfBuzz objects and enums. Enable using
839 - Added gobject-introspection boilerplate. Nothing useful
840 right now. Work in progress. Gets enabled automatically if
841 --with-gobject is used. Override with --disable-introspection.
844 - Apply 'mark' in Myanmar shaper.
845 - Don't apply 'dlig' by default.
848 - Support user features.
849 - Fix loading of fonts that are also installed on the system.
850 - Fix shaping of Arabic Presentation Forms.
851 - Fix build with wide chars.
854 - Support user features.
857 - hb_face_t code moved to hb-face.h / hb-face.cc.
858 - Added hb-deprecated.h.
861 - Added HB_DISABLE_DEPRECATED.
862 - Deprecated HB_SCRIPT_CANADIAN_ABORIGINAL; replaced by
863 HB_SCRIPT_CANADIAN_SYLLABICS.
864 - Deprecated HB_BUFFER_FLAGS_DEFAULT; replaced by
865 HB_BUFFER_FLAG_DEFAULT.
866 - Deprecated HB_BUFFER_SERIALIZE_FLAGS_DEFAULT; replaced by
867 HB_BUFFER_SERIALIZE_FLAG_DEFAULT.
870 Overview of changes leading to 0.9.19
871 Tuesday, July 16, 2013
872 =====================================
875 - Better handling of multiple variation selectors in a row.
876 - Pass on variation selector to GSUB if not consumed by cmap.
877 - Fix undefined memory access.
878 - Add Javanese config to Indic shaper.
881 Overview of changes leading to 0.9.18
882 Tuesday, May 28, 2013
883 =====================================
887 - All unneeded code is all disabled by default,
889 - Uniscribe and CoreText shapers can be enabled with their --with options,
891 - icu_le and old shapers cannot be enabled for now,
893 - glib, freetype, and cairo will be detected automatically.
894 They can be force on/off'ed with their --with options,
896 - icu and graphite2 are default off, can be enabled with their --with
899 Moreover, ICU support is now build into a separate library:
900 libharfbuzz-icu.so, and a new harfbuzz-icu.pc is shipped for it.
901 Distros can enable ICU now without every application on earth
902 getting linked to via libharfbuzz.so.
904 For distros I recommend that they make sure they are building --with-glib
905 --with-freetype --with-cairo, --with-icu, and optionally --with-graphite2;
906 And package harfbuzz and harfbuzz-icu separately.
909 Overview of changes leading to 0.9.17
911 =====================================
914 - Fix bug in hb_set_get_min().
915 - Fix regression with Arabic mark positioning / width-zeroing.
917 Overview of changes leading to 0.9.16
918 Friday, April 19, 2013
919 =====================================
921 - Major speedup in OpenType lookup processing. With the Amiri
922 Arabic font, this release is over 3x faster than previous
923 release. All scripts / languages should see this speedup.
925 - New --num-iterations option for hb-shape / hb-view; useful for
928 Overview of changes leading to 0.9.15
929 Friday, April 05, 2013
930 =====================================
933 - Fix crasher in graphite2 shaper.
934 - Fix Arabic mark width zeroing regression.
935 - Don't compose Hangul jamo into Unicode syllables.
938 Overview of changes leading to 0.9.14
939 Thursday, March 21, 2013
940 =====================================
943 - Fix time-consuming sanitize with malicious fonts.
944 - Implement hb_buffer_deserialize_glyphs() for both json and text.
945 - Do not ignore Hangul filler characters.
947 * Fix Malayalam pre-base reordering interaction with post-forms.
948 * Further adjust ZWJ handling. Should fix known regressions from
952 Overview of changes leading to 0.9.13
953 Thursday, February 25, 2013
954 =====================================
957 - Ngapi HarfBuzz Hackfest in London (February 2013):
958 * Fixed all known Indic bugs,
959 * New Win8-style Myanmar shaper,
960 * New South-East Asian shaper for Tai Tham, Cham, and New Tai Lue,
961 * Smartly ignore Default_Ignorable characters (joiners, etc) wheb
962 matching GSUB/GPOS lookups,
963 * Fix 'Phags-Pa U+A872 shaping,
964 * Fix partial disabling of default-on features,
965 * Allow disabling of TrueType kerning.
966 - Fix possible crasher with broken fonts with overlapping tables.
967 - Removed generated files from git again. So, one needs ragel to
968 bootstrap from the git tree.
971 - hb_shape() and related APIs now abort if buffer direction is
972 HB_DIRECTION_INVALID. Previously, hb_shape() was calling
973 hb_buffer_guess_segment_properties() on the buffer before
974 shaping. The heuristics in that function are fragile. If the
975 user really wants the old behvaior, they can call that function
976 right before calling hb_shape() to get the old behavior.
977 - hb_blob_create_sub_blob() always creates sub-blob with
978 HB_MEMORY_MODE_READONLY. See comments for the reason.
981 Overview of changes leading to 0.9.12
982 Thursday, January 18, 2013
983 =====================================
985 - Build fixes for Sun compiler.
988 Overview of changes leading to 0.9.11
989 Thursday, January 10, 2013
990 =====================================
993 - Fix GPOS mark attachment with null Anchor offsets.
994 - [Indic] Fix old-spec reordering of viramas if sequence ends in one.
995 - Fix multi-threaded shaper data creation crash.
996 - Add atomic ops for Solaris.
999 - Rename hb_buffer_clear() to hb_buffer_clear_contents().
1002 Overview of changes leading to 0.9.10
1003 Thursday, January 3, 2013
1004 =====================================
1006 - [Indic] Fixed rendering of Malayalam dot-reph
1007 - Updated OT language tags.
1008 - Updated graphite2 backend.
1009 - Improved hb_ot_layout_get_size_params() logic.
1010 - Improve hb-shape/hb-view help output.
1011 - Fixed hb-set.h implementation to not crash.
1012 - Fixed various issues with hb_ot_layout_collect_lookups().
1013 - Various build fixes.
1017 hb_graphite2_face_get_gr_face()
1018 hb_graphite2_font_get_gr_font()
1019 hb_coretext_face_get_cg_font()
1023 hb_ot_layout_get_size_params()
1026 Overview of changes leading to 0.9.9
1027 Wednesday, December 5, 2012
1028 ====================================
1030 - Fix build on Windows.
1031 - Minor improvements.
1034 Overview of changes leading to 0.9.8
1035 Tuesday, December 4, 2012
1036 ====================================
1039 - Actually implement hb_shape_plan_get_shaper ().
1040 - Make UCDB data tables const.
1041 - Lots of internal refactoring in OTLayout tables.
1042 - Flesh out hb_ot_layout_lookup_collect_glyphs().
1046 hb_ot_layout_collect_lookups()
1047 hb_ot_layout_get_size_params()
1050 Overview of changes leading to 0.9.7
1051 Sunday, November 21, 2012
1052 ====================================
1055 HarfBuzz "All-You-Can-Eat-Sushi" (aka Vancouver) Hackfest and follow-on fixes.
1057 - Fix Arabic contextual joining using pre-context text.
1058 - Fix Sinhala "split matra" mess.
1059 - Fix Khmer shaping with broken fonts.
1060 - Implement Thai "PUA" shaping for old fonts.
1061 - Do NOT route Kharoshthi script through the Indic shaper.
1062 - Disable fallback positioning for Indic and Thai shapers.
1066 hb-shape / hb-view changes:
1068 - Add --text-before and --text-after
1069 - Add --bot / --eot / --preserve-default-ignorables
1070 - hb-shape --output-format=json
1079 HB_BUFFER_FLAGS_DEFAULT
1082 HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES
1084 hb_buffer_set_flags()
1085 hb_buffer_get_flags()
1087 HB_BUFFER_SERIALIZE_FLAGS
1088 hb_buffer_serialize_glyphs()
1089 hb_buffer_deserialize_glyphs()
1090 hb_buffer_serialize_list_formats()
1094 hb_set_get_population()
1097 hb_face_[sg]et_glyph_count()
1099 hb_segment_properties_t
1100 HB_SEGMENT_PROPERTIES_DEFAULT
1101 hb_segment_properties_equal()
1102 hb_segment_properties_hash()
1104 hb_buffer_set_segment_properties()
1105 hb_buffer_get_segment_properties()
1107 hb_ot_layout_glyph_class_t
1108 hb_ot_layout_get_glyph_class()
1109 hb_ot_layout_get_glyphs_in_class()
1112 hb_shape_plan_create()
1113 hb_shape_plan_create_cached()
1114 hb_shape_plan_get_empty()
1115 hb_shape_plan_reference()
1116 hb_shape_plan_destroy()
1117 hb_shape_plan_set_user_data()
1118 hb_shape_plan_get_user_data()
1119 hb_shape_plan_execute()
1120 hb_shape_plan_get_shaper()
1122 hb_ot_shape_plan_collect_lookups()
1127 - Remove "mask" parameter from hb_buffer_add().
1128 - Rename hb_ot_layout_would_substitute_lookup() and hb_ot_layout_substitute_closure_lookup().
1129 - hb-set.h API const correction.
1130 - Renamed hb_set_min/max() to hb_set_get_min/max().
1131 - Rename hb_ot_layout_feature_get_lookup_indexes() to hb_ot_layout_feature_get_lookups().
1132 - Rename hb_buffer_guess_properties() to hb_buffer_guess_segment_properties().
1136 Overview of changes leading to 0.9.6
1137 Sunday, November 13, 2012
1138 ====================================
1140 - Don't clear pre-context text if no new context is provided.
1141 - Fix ReverseChainingSubstLookup, which was totally borked.
1142 - Adjust output format of hb-shape a bit.
1143 - Include config.h.in in-tree. Makes it easier for alternate build systems.
1144 - Fix hb_buffer_set_length(buffer, 0) invalid memory allocation.
1145 - Use ICU LayoutEngine's C API instead of C++. Avoids much headache.
1146 - Drop glyphs for all of Unicode Default_Ignorable characters.
1150 - Enable 'dlig' and 'mset' features in Arabic shaper.
1151 - Implement 'Phags-pa shaping, improve Mongolian.
1154 - Decompose Sinhala split matras the way old HarfBuzz / Pango did.
1155 - Initial support for Consonant Medials.
1156 - Start adding new-style Myanmar shaping.
1157 - Make reph and 'pref' logic introspect the font.
1158 - Route Meetei-Mayek through the Indic shaper.
1159 - Don't apply 'liga' in Indic shaper.
1160 - Improve Malayalam pre-base reordering Ra interaction with Chillus.
1164 Overview of changes leading to 0.9.5
1165 Sunday, October 14, 2012
1166 ====================================
1168 - Synthetic-GSUB Arabic fallback shaping.
1170 - Misc Indic improvements.
1172 - Add build system support for pthread.
1174 - Imported UCDN for in-tree Unicode callbacks implementation.
1176 - Context-aware Arabic joining.
1182 hb_feature_to/from-string()
1183 hb_buffer_[sg]et_content_type()
1187 Overview of changes leading to 0.9.4
1188 Tuesday, Sep 03, 2012
1189 ====================================
1191 - Indic improvements with old-spec Malayalam.
1193 - Better fallback glyph positioning, specially with Thai / Lao marks.
1195 - Implement dotted-circle insertion.
1197 - Better Arabic fallback shaping / ligation.
1199 - Added ICU LayoutEngine backend for testing. Call it by the 'icu_le' name.
1205 Overview of changes leading to 0.9.3
1206 Friday, Aug 18, 2012
1207 ====================================
1209 - Fixed fallback mark positioning for left-to-right text.
1211 - Improve mark positioning for the remaining combining classes.
1213 - Unbreak Thai and fallback Arabic shaping.
1215 - Port Arabic shaper to shape-plan caching.
1217 - Use new ICU normalizer functions.
1221 Overview of changes leading to 0.9.2
1222 Friday, Aug 10, 2012
1223 ====================================
1225 - Over a thousand commits! This is the first major release of HarfBuzz.
1227 - HarfBuzz is feature-complete now! It should be in par, or better, than
1228 both Pango's shapers and old HarfBuzz / Qt shapers.
1230 - New Indic shaper, supporting main Indic scripts, Sinhala, and Khmer.
1232 - Improved Arabic shaper, with fallback Arabic shaping, supporting Arabic,
1233 Sinhala, N'ko, Mongolian, and Mandaic.
1235 - New Thai / Lao shaper.
1237 - Tibetan / Hangul support in the generic shaper.
1239 - Synthetic GDEF support for fonts without a GDEF table.
1241 - Fallback mark positioning for fonts without a GPOS table.
1243 - Unicode normalization shaping heuristic during glyph mapping.
1245 - New experimental Graphite2 backend.
1247 - New Uniscribe backend (primarily for testing).
1249 - New CoreText backend (primarily for testing).
1251 - Major optimization and speedup.
1253 - Test suites and testing infrastructure (work in progress).
1255 - Greatly improved hb-view cmdline tool.
1257 - hb-shape cmdline tool.
1259 - Unicode 6.1 support.
1261 Summary of API changes:
1265 - Users are expected to only include main header files now (ie. hb.h,
1266 hb-glib.h, hb-ft.h, ...)
1268 - All struct tag names had their initial underscore removed.
1269 Ie. "struct _hb_buffer_t" is "struct hb_buffer_t" now.
1271 - All set_user_data() functions now take a "replace" boolean parameter.
1273 - hb_buffer_create() takes zero arguments now.
1274 Use hb_buffer_pre_allocate() to pre-allocate.
1276 - hb_buffer_add_utf*() now accept -1 for length parameteres,
1277 meaning "nul-terminated".
1279 - hb_direction_t enum values changed.
1281 - All *_from_string() APIs now take a length parameter to allow for
1282 non-nul-terminated strings. A -1 length means "nul-terminated".
1284 - Typedef for hb_language_t changed.
1286 - hb_get_table_func_t renamed to hb_reference_table_func_t.
1288 - hb_ot_layout_table_choose_script()
1290 - Various renames in hb-unicode.h.
1294 - hb_buffer_guess_properties()
1295 Automatically called by hb_shape().
1297 - hb_buffer_normalize_glyphs()
1299 - hb_tag_from_string()
1305 - hb_face_reference_blob()
1306 - hb_face_[sg]et_index()
1307 - hb_face_set_upem()
1309 - hb_font_get_glyph_name_func_t
1310 hb_font_get_glyph_from_name_func_t
1311 hb_font_funcs_set_glyph_name_func()
1312 hb_font_funcs_set_glyph_from_name_func()
1313 hb_font_get_glyph_name()
1314 hb_font_get_glyph_from_name()
1315 hb_font_glyph_to_string()
1316 hb_font_glyph_from_string()
1318 - hb_font_set_funcs_data()
1320 - hb_ft_font_set_funcs()
1321 - hb_ft_font_get_face()
1323 - hb-gobject.h (work in progress)
1325 - hb_ot_shape_glyphs_closure()
1326 hb_ot_layout_substitute_closure_lookup()
1332 - hb_unicode_combining_class_t
1334 - hb_unicode_compose_func_t
1335 hb_unicode_decompose_func_t
1336 hb_unicode_decompose_compatibility_func_t
1337 hb_unicode_funcs_set_compose_func()
1338 hb_unicode_funcs_set_decompose_func()
1339 hb_unicode_funcs_set_decompose_compatibility_func()
1340 hb_unicode_compose()
1341 hb_unicode_decompose()
1342 hb_unicode_decompose_compatibility()
1346 - hb_ft_get_font_funcs()
1348 - hb_ot_layout_substitute_start()
1349 hb_ot_layout_substitute_lookup()
1350 hb_ot_layout_substitute_finish()
1351 hb_ot_layout_position_start()
1352 hb_ot_layout_position_lookup()
1353 hb_ot_layout_position_finish()
1357 Overview of changes leading to 0.6.0
1358 Friday, May 27, 2011
1359 ====================================
1361 - Vertical text support in GPOS
1362 - Almost all API entries have unit tests now, under test/
1363 - All thread-safety issues are fixed
1365 Summary of API changes follows.
1372 hb_language_get_default()
1373 hb_direction_to_string()
1374 hb_direction_from_string()
1375 hb_script_get_horizontal_direction()
1379 hb_category_t renamed to hb_unicode_general_category_t
1382 hb_language_t is a typed pointers now
1388 * Use ISO 15924 tags for hb_script_t:
1391 hb_script_from_iso15924_tag()
1392 hb_script_to_iso15924_tag()
1393 hb_script_from_string()
1396 HB_SCRIPT_* enum members changed value.
1399 * Buffer API streamlined:
1403 hb_buffer_set_length()
1404 hb_buffer_allocation_successful()
1407 hb_buffer_ensure() renamed to hb_buffer_pre_allocate()
1408 hb_buffer_add_glyph() renamed to hb_buffer_add()
1412 hb_buffer_clear_positions()
1415 hb_buffer_get_glyph_infos() takes an out length parameter now
1416 hb_buffer_get_glyph_positions() takes an out length parameter now
1419 * Blob API streamlined:
1423 hb_blob_get_data_writable()
1426 hb_blob_create_empty() renamed to hb_blob_get_empty()
1431 hb_blob_is_writable()
1432 hb_blob_try_writable()
1435 hb_blob_create() takes user_data before destroy now
1438 * Unicode functions API:
1440 o Unicode function vectors can subclass other unicode function vectors now.
1441 Unimplemented callbacks in the subclass automatically chainup to the parent.
1443 o All hb_unicode_funcs_t callbacks take a user_data now. Their setters
1444 take a user_data and its respective destroy callback.
1447 hb_unicode_funcs_get_empty()
1448 hb_unicode_funcs_get_default()
1449 hb_unicode_funcs_get_parent()
1452 hb_unicode_funcs_create() now takes a parent_funcs.
1454 o Removed func getter functions:
1455 hb_unicode_funcs_get_mirroring_func()
1456 hb_unicode_funcs_get_general_category_func()
1457 hb_unicode_funcs_get_script_func()
1458 hb_unicode_funcs_get_combining_class_func()
1459 hb_unicode_funcs_get_eastasian_width_func()
1465 hb_face_get_table() renamed to hb_face_reference_table()
1466 hb_face_create_for_data() renamed to hb_face_create()
1469 hb_face_create_for_tables() takes user_data before destroy now
1470 hb_face_reference_table() returns empty blob instead of NULL
1471 hb_get_table_func_t accepts the face as first parameter now
1475 o Fonts can subclass other fonts now. Unimplemented callbacks in the
1476 subclass automatically chainup to the parent. When chaining up,
1477 scale is adjusted if the parent font has a different scale.
1479 o All hb_font_funcs_t callbacks take a user_data now. Their setters
1480 take a user_data and its respective destroy callback.
1483 hb_font_get_parent()
1484 hb_font_funcs_get_empty()
1485 hb_font_create_sub_font()
1488 hb_font_funcs_copy()
1489 hb_font_unset_funcs()
1491 o Removed func getter functions:
1492 hb_font_funcs_get_glyph_func()
1493 hb_font_funcs_get_glyph_advance_func()
1494 hb_font_funcs_get_glyph_extents_func()
1495 hb_font_funcs_get_contour_point_func()
1496 hb_font_funcs_get_kerning_func()
1499 hb_font_create() takes a face and references it now
1500 hb_font_set_funcs() takes user_data before destroy now
1501 hb_font_set_scale() accepts signed integers now
1502 hb_font_get_contour_point_func_t now takes glyph first, then point_index
1503 hb_font_get_glyph_func_t returns a success boolean now
1506 * Changed object model:
1508 o All object types have a _get_empty() now:
1510 hb_buffer_get_empty()
1513 hb_font_funcs_get_empty()
1514 hb_unicode_funcs_get_empty()
1516 o Added _set_user_data() and _get_user_data() for all object types:
1517 hb_blob_get_user_data()
1518 hb_blob_set_user_data()
1519 hb_buffer_get_user_data()
1520 hb_buffer_set_user_data()
1521 hb_face_get_user_data()
1522 hb_face_set_user_data()
1523 hb_font_funcs_get_user_data()
1524 hb_font_funcs_set_user_data()
1525 hb_font_get_user_data()
1526 hb_font_set_user_data()
1527 hb_unicode_funcs_get_user_data()
1528 hb_unicode_funcs_set_user_data()
1530 o Removed the _get_reference_count() from all object types:
1531 hb_blob_get_reference_count()
1532 hb_buffer_get_reference_count()
1533 hb_face_get_reference_count()
1534 hb_font_funcs_get_reference_count()
1535 hb_font_get_reference_count()
1536 hb_unicode_funcs_get_reference_count()
1538 o Added _make_immutable() and _is_immutable() for all object types except for buffer:
1539 hb_blob_make_immutable()
1540 hb_blob_is_immutable()
1541 hb_face_make_immutable()
1542 hb_face_is_immutable()
1545 * Changed API for vertical text support
1547 o The following callbacks where removed:
1548 hb_font_get_glyph_advance_func_t
1549 hb_font_get_kerning_func_t
1551 o The following new callbacks added instead:
1552 hb_font_get_glyph_h_advance_func_t
1553 hb_font_get_glyph_v_advance_func_t
1554 hb_font_get_glyph_h_origin_func_t
1555 hb_font_get_glyph_v_origin_func_t
1556 hb_font_get_glyph_h_kerning_func_t
1557 hb_font_get_glyph_v_kerning_func_t
1559 o The following API removed as such:
1560 hb_font_funcs_set_glyph_advance_func()
1561 hb_font_funcs_set_kerning_func()
1562 hb_font_get_glyph_advance()
1563 hb_font_get_kerning()
1565 o New API added instead:
1566 hb_font_funcs_set_glyph_h_advance_func()
1567 hb_font_funcs_set_glyph_v_advance_func()
1568 hb_font_funcs_set_glyph_h_origin_func()
1569 hb_font_funcs_set_glyph_v_origin_func()
1570 hb_font_funcs_set_glyph_h_kerning_func()
1571 hb_font_funcs_set_glyph_v_kerning_func()
1572 hb_font_get_glyph_h_advance()
1573 hb_font_get_glyph_v_advance()
1574 hb_font_get_glyph_h_origin()
1575 hb_font_get_glyph_v_origin()
1576 hb_font_get_glyph_h_kerning()
1577 hb_font_get_glyph_v_kerning()
1579 o The following higher-leve API added for convenience:
1580 hb_font_get_glyph_advance_for_direction()
1581 hb_font_get_glyph_origin_for_direction()
1582 hb_font_add_glyph_origin_for_direction()
1583 hb_font_subtract_glyph_origin_for_direction()
1584 hb_font_get_glyph_kerning_for_direction()
1585 hb_font_get_glyph_extents_for_origin()
1586 hb_font_get_glyph_contour_point_for_origin()
1589 * OpenType Layout API:
1592 hb_ot_layout_position_start()
1593 hb_ot_layout_substitute_start()
1594 hb_ot_layout_substitute_finish()
1600 hb_glib_script_to_script()
1601 hb_glib_script_from_script()
1602 hb_icu_script_to_script()
1603 hb_icu_script_from_script()
1606 * Version API added: