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Member "harfbuzz-2.7.2/NEWS" (28 Aug 2020, 72718 Bytes) of package /linux/misc/harfbuzz-2.7.2.tar.xz:


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