DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (1aeaa33a64f9)

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CHANGES BETWEEN 2.8.1 and 2.9

  I. IMPORTANT BUG FIXES

    - Advance width values of variation fonts were often wrong.

    - More fixes for variation font support; you should update to this
      version if you want to support them.


  II. IMPORTANT CHANGES

    - As a GSoC project, Ewald Hew extended the new (Adobe) CFF engine
      to  handle  Type  1  fonts  also,  thus  greatly  improving  the
      rendering of  this format.   This is the  new default.   The old
      engine   is  still   available   if   the  configuration   macro
      `T1_CONFIG_OPTION_OLD_ENGINE'    gets    defined;   using    the
      `hinting-engine' property  of the `type1' driver  module you can
      then switch between the two engines.

    - A new function,  `FT_Set_Named_Instance', can be used  to set or
      change the current named instance.

    - Starting  with   this  FreeType  version,   resetting  variation
      coordinates  will   return  to  the  currently   selected  named
      instance.  Previously, FreeType returned to the base font (i.e.,
      no instance set).


  III. MISCELLANEOUS

    - The `face_flags' field of the `FT_Face' structure has a new bit,
      `FT_FACE_FLAG_VARIATION', which  is set if a  variation font has
      been      altered      with      `FT_Set_MM_Design_Coordinates',
      `FT_Set_Var_Design_Coordinates',                              or
      `FT_Set_Var_Blend_Coordinates'.

    - If  the  current  face  is  a  named  instance,  the  new  macro
      `FT_IS_NAMED_INSTANCE' returns true.

    - `FT_IS_VARIATION' is  a new macro  that returns true  whenever a
      face object has  been altered by `FT_Set_MM_Design_Coordinates',
      `FT_Set_Var_Design_Coordinates',                              or
      `FT_Set_Var_Blend_Coordinates'.

    - Changing  the  design  coordinates  of  a  variation  font  with
      `FT_Set_Var_Design_Coordinates'                               or
      `FT_Set_Var_Blend_Coordinates'  does  not  influence  the  named
      instance index value (only `FT_Set_Named_Instance' does that).

    - Special PostScript  names for named instances  are only returned
      if the  named instance is set  with `FT_Set_Named_Instance' (and
      the font  has corresponding  entries in  its `fvar'  table).  If
      `FT_IS_VARIATION'  returns  true,  the  algorithmically  derived
      PostScript name is provided, not  looking up special entries for
      named instances.

    - A new function  `FT_Done_MM_Var' is provided to  free the memory
      returned in a call to `FT_Get_MM_Var'.

    - On  platforms  using  the   `configure'  script,  the  installed
      `ftoption.h' file  now correctly reflects  configuration options
      like `--with-harfbuzz'.

    - Better  support to  build FreeType  as  a DLL  on Windows  using
      Visual C.

    - All data specific to driver modules is now collected in a single
      file,      `FT_DRIVER_H'.      Consequently,      the     macros
      `FT_AUTOHINTER_H',   `FT_CFF_DRIVER_H',  `FT_TRUETYPE_DRIVER_H',
      and `FT_PCF_DRIVER_H' still work but are deprecated.

    - Some fuzzer fixes to better reject malformed fonts.

    - The `ftbench' demo program has a new test for opening a new face
      and loading some glyphs.

    - The `ftbench' demo program has a  new option `-j' to specify the
      last glyph index to be used in the tests.

    - The  `ftgrid' demo  program has  a new  option `-n'  to suppress
      display of named instances of variation fonts.

    - The `ttdebug' demo program can now  show a stack trace (key `K')
      and switch  between hexadecimal and decimal  display of integers
      (key `I').

======================================================================

CHANGES BETWEEN 2.8 and 2.8.1

  I. IMPORTANT BUG FIXES

    - B/W  hinting   of  TrueType   fonts  didn't  work   properly  if
      interpreter version 38 or 40 was selected.

    - Some severe  problems within the handling  of TrueType Variation
      Fonts were found and fixed.

    - Function `FT_Set_Var_Design_Coordinates' didn't correctly handle
      the case with less input coordinates than axes.


  II. IMPORTANT CHANGES

    - By  default,  FreeType  now offers  high  quality  LCD-optimized
      output without  resorting to ClearType techniques  of resolution
      tripling and  filtering.  In  this method, called  Harmony, each
      color channel  is generated separately after  shifting the glyph
      outline, capitalizing  on the fact  that the color grids  on LCD
      panels  are shifted  by  a third  of a  pixel.   This output  is
      indistinguishable from ClearType with a light 3-tap filter.


  III. MISCELLANEOUS

    - Using the  new function `FT_Get_Var_Axis_Flags',  an application
      can access the `flags' field  of a variation axis (introduced in
      OpenType version 1.8.2)

    - More sanity checks.

    - The  internal representation  of buffers  for LCD  rendering has
      changed (to be more precise, the amount of padding gets computed
      differently).  Applications  that use  the FreeType API  are not
      affected.

    - To  reset all  design axis  values of  a variation  font to  its
      default values you can now say

        error = FT_Set_Var_Design_Coordinates( face, 0, NULL );

      This  also works  with functions  `FT_Set_MM_Design_Coordinates'
      and `FT_Set_MM_Blend_Coordinates'.

    - FreeType  now synthesizes  a  missing Unicode  cmap for  (older)
      TrueType fonts also if glyph names are available.

    - FreeType  has  improved  handling   of  BDF  fonts  without  the
      `POINT_SIZE', `RESOLUTION_X', or  `RESOLUTION_Y' properties; the
      library now  uses the values of  the `SIZE' keyword if  they are
      missing.   Previously,   `SIZE'  was  completely   ignored,  and
      FreeType used heuristic values instead.

    - Multiple calls to `FT_Bitmap_Convert' do work now as advertised.
      Previously,  they failed with an assertion error if there was an
      empty bitmap between non-empty ones.

    - The warping option  has moved  from `light'  to `normal' hinting
      where  it replaces  the original hinting algorithm.  The `light'
      mode is now always void of any hinting in x-direction.

    - 16bit  compiler  support is  now  officially  ended.  We  didn't
      provide any maintenance  since many years,  and given that there
      were no error  or problem reports either it seems  that it is no
      longer needed.

    - The `ftgrid'  demo program  can now toggle  the display  of grid
      lines with the `G' key.

    - The `ftgrid' demo  program can toggle a different  set of colors
      (suitable to color-blind people) with the `C' key.

    - The `ftgrid'  demo program  now supports  the `-e'  command line
      option to select a cmap.

    - The `ftdump' demo program has a  new command line option `-t' to
      output the SFNT table list.


======================================================================

CHANGES BETWEEN 2.7.1 and 2.8

  I. IMPORTANT CHANGES

    - Support for OpenType Variation Fonts is now complete.   The last
      missing part was handling the `VVAR' and `MVAR' tables, which is
      available with this release.

    - A new  function `FT_Face_Properties' allows the  control of some
      module  and   library  properties  per  font.    Currently,  the
      following properties can be  handled: stem darkening, LCD filter
      weights, and the random seed for the `random' CFF operator.

    - The PCF change to show more `colourful' family names (introduced
      in version 2.7.1) was too radical; it can now be configured with
      PCF_CONFIG_OPTION_LONG_FAMILY_NAMES   at   compile   time.    If
      activated, it can  be switched off at run time  with the new pcf
      property  `no-long-family-names'.  If  the `FREETYPE_PROPERTIES'
      environment variable is available, you can say

        FREETYPE_PROPERTIES=pcf:no-long-family-names=1

    - Support  for  the  following  scripts  has  been  added  to  the
      auto-hinter.

        Adlam, Avestan, Bamum, Buhid, Carian, Chakma, Coptic, Cypriot,
        Deseret, Glagolitic, Gothic, Kayah, Lisu, N'Ko, Ol Chiki, Old
        Turkic, Osage, Osmanya, Saurashtra, Shavian, Sundanese, Tai
        Viet, Tifinagh, Unified Canadian Syllabics, Vai


  II. IMPORTANT BUG FIXES

    - `Light' auto-hinting  mode no  longer uses TrueType  metrics for
      TrueType  fonts.   This bug  was  introduced  in version  2.4.6,
      causing   horizontal  scaling   also.    Almost  all   GNU/Linux
      distributions (with Fedora as  a notable exception) disabled the
      corresponding patch for good reasons; chances are thus high that
      you won't notice a difference.

      If  optical backward  compatibility for  legacy applications  is
      necessary, you might enable the AF_CONFIG_OPTION_TT_SIZE_METRICS
      configuration option.   However, it  is strongly  recommended to
      avoid that, adjusting font sizes instead.

    - Global size  metrics values  in the  `FT_Size_Metrics' structure
      can be  different for TrueType  fonts.  Reason is that  in older
      FreeType  versions  the  metrics  were  rounded  differently  to
      integer pixels compared  to all other font  formats, yielding an
      inconsistent behaviour if you used non-native hinting.  Starting
      with this  version, global size  metrics for TrueType  fonts are
      handled the same as other  font formats: `ascender' gets rounded
      up,  `descender'  gets  rounded  down,  `height'  gets  normally
      rounded, and `max_advance' gets normally rounded, too.

      If you need more precise values of (global) ascender, descender,
      height, or  `max_advance', please take the  corresponding values
      from the `FT_Face' structure and scale them manually.

    - If a TrueType font gets loaded with FT_LOAD_NO_HINTING, FreeType
      now scales  the font linearly  again (bug introduced  in version
      2.4.6).

    - CVE-2017-8105,  CVE-2017-8287:  Older   FreeType  versions  have
      out-of-bounds  writes  caused  by  heap-based  buffer  overflows
      related to Type 1 fonts.

        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8105
        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8287


  III. MISCELLANEOUS

    - A  new function  `FT_Set_Default_Properties' has  been added  to
      parse    the    `FREETYPE_PROPERTIES'    environment    variable
      (previously, it  was internal only).   `FT_Init_FreeType' always
      call this  function, but  `FT_New_Library' does not  (similar to
      `FT_Add_Default_Modules').

    - To be in sync with OpenType version 1.7 and newer, macros

        FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY,
        FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY,
        TT_NAME_ID_PREFERRED_FAMILY
        TT_NAME_ID_PREFERRED_SUBFAMILY

      are renamed to

        FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY,
        FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY,
        TT_NAME_ID_TYPOGRAPHIC_FAMILY
        TT_NAME_ID_TYPOGRAPHIC_SUBFAMILY

      The old macro names are deprecated (but still available).

    - Support for SFNT `name' tables has been improved.

      . Format  1 `name' tables  are now supported.  Use  new function
        `FT_Get_Sfnt_LangTag' to access associated language tags.

      . Language, encoding, and name IDs have been updated to OpenType
        version 1.8.1.

    - The new CFF  engine now handles the `random'  operator.  All CFF
      opcodes are now supported.

    - The CFF module  has a new property `random-seed'  to control the
      pseudo-random number generation for the `random' operator.

    - The `freetype-config' script is now a wrapper of `pkg-config' if
      this program is available in the path.

    - FT_LOAD_TARGET_LCD  is now  a  variant of  FT_LOAD_TARGET_LIGHT;
      this should provide better rendering results.

    - A mode to display  light auto-hinting with sub-pixel positioning
      has been added to `ftdiff'.


======================================================================

CHANGES BETWEEN 2.7 and 2.7.1

  I. IMPORTANT CHANGES

    - Support for the new CFF2 font format as introduced with OpenType
      1.8 has been contributed by Dave Arnolds from Adobe.

    - Preliminary support for variation fonts as specified in OpenType
      1.8 (in addition to the  already existing support for Adobe's MM
      and Apple's  GX formats).  Dave Arnolds  contributed handling of
      advance  width change  variation;  more will  come  in the  next
      version.


  II. IMPORTANT BUG FIXES

    - Handling of  raw CID fonts was partially  broken (bug introduced
      in 2.6.4).

    - CVE-2016-10328:  Older  FreeType versions had  an  out-of-bounds
      write caused by a heap-based  buffer overflow related to the CFF
      fonts.

        https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10328


  III. MISCELLANEOUS

    - Some limits for TrueType  bytecode execution have been tightened
      to  speed   up  FreeType's  handling  of   malformed  fonts,  in
      particular to quickly abort endless loops.

      - The  number of  twilight points  can no  longer be  set to  an
        arbitrarily large value.

      - The total number of jump  opcode instructions (like JMPR) with
        negative arguments  is dynamically restricted; the  same holds
        for the total number of iterations in LOOPCALL opcodes.

      The dynamic limits are based on  the number of points in a glyph
      and the number of CVT entries.  Please report if you encounter a
      font where the selected values are not adequate.

    - PCF family names are made more `colourful'; they now include the
      foundry  and information  whether they contain  wide characters.
      For example,  you no longer get `Fixed' but  rather `Sony Fixed'
      or `Misc Fixed Wide'.

    - A new  function `FT_Get_Var_Blend_Coordinates'  (with its  alias
      name  `FT_Get_MM_Blend_Coordinates') to retrieve the  normalized
      blend  coordinates of the currently  selected variation instance
      has been added to the Multiple Masters interface.

    - A new  function `FT_Get_Var_Design_Coordinates' to  retrieve the
      design coordinates of the  currently selected variation instance
      has been added to the Multiple Masters interface.

    - A new load flag `FT_LOAD_BITMAP_METRICS_ONLY' to retrieve bitmap
      information without loading the (embedded) bitmap itself.

    - Retrieving   advance   widths   from   bitmap   strikes   (using
      `FT_Get_Advance' and `FT_Get_Advances') have been sped up.

    - The  usual round  of  fuzzer fixes  to  better reject  malformed
      fonts.

    - The `ftmulti' demo program can now switch engines with key `H'.

    - The  `ftstring'  demo  program   can  now  show  some  built-in,
      non-latin sample strings (to be selected with the TAB key).

    - The  `ftview'  demo program  can  now  switch between  a  font's
      charmaps using the TAB key.


======================================================================

CHANGES BETWEEN 2.6.5 and 2.7

  I. IMPORTANT CHANGES

    - As announced earlier, the 2.7.x series now uses the new subpixel
      hinting  mode as  the  default, emulating  a  modern version  of
      ClearType.

      This change inevitably leads to different rendering results, and
      you   might   change   the   `TT_CONFIG_OPTION_SUBPIXEL_HINTING'
      configuration option to  adapt it to your taste (or  use the new
      `FREETYPE_PROPERTIES'    environment    variable).    See    the
      corresponding entry  below for  version 2.6.4, which  gives more
      information.

    - A new option  `FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES' has been
      introduced.   If  set (which  is  the  default), an  environment
      variable  `FREETYPE_PROPERTIES' can  be used  to control  driver
      properties.  Example:

        FREETYPE_PROPERTIES=truetype:interpreter-version=35 \
                            cff:no-stem-darkening=1 \
                            autofitter:warping=1

      This allows to select, say, the subpixel hinting mode at runtime
      for a given application.  See file `ftoption.h' for more.


  II. IMPORTANT BUG FIXES

    - After  loading a  named instance  of  a GX  variation font,  the
      `face_index'  value  in  the returned  `FT_Face'  structure  now
      correctly holds the named instance  index in the upper 16bits as
      documented.


  III. MISCELLANEOUS

    - A new macro `FT_IS_NAMED_INSTANCE' to  test whether a given face
      is a named instance.

    - More fixes to GX font handling.

    - Apple's   `GETVARIATION'  bytecode   operator  (needed   for  GX
      variation font support) has been implemented.

    - Another round  of fuzzer fixes,  mainly to reject  invalid fonts
      faster.

    - Handling of raw CID fonts  was broken (bug introduced in version
      2.6.4).

    - The smooth rasterizer has been streamlined  to make it faster by
      approx. 20%.

    - The `ftgrid'  demo program now  understands command  line option
      `-d' to give start-up design coordinates.

    - The `ftdump' demo program has  a new command line option `-p' to
      dump TrueType bytecode instructions.


======================================================================

CHANGES BETWEEN 2.6.4 and 2.6.5

  I. IMPORTANT BUG FIXES

    - Compilation works again  on Mac OS X (bug introduced  in version
      2.6.4).


  II. IMPORTANT CHANGES

    - The new  subpixel hinting  mode is now  disabled by  default; it
      will  be enabled  by default  in the  forthcoming 2.7.x  series.
      Main reason for reverting this feature is the principle of least
      surprise: a  sudden change in  appearance of all fonts  (even if
      the rendering improves  for almost all recent  fonts) should not
      be expected in a new micro version of a series.


======================================================================

CHANGES BETWEEN 2.6.3 and 2.6.4

  I. IMPORTANT CHANGES

    - A new  subpixel hinting  mode has  been contributed  by Nikolaus
      Waxweiler, which is now the  default rendering mode for TrueType
      fonts.  It implements  (almost everything of) version  40 of the
      bytecode engine.

      The existing code  base in FreeType (the  `Infinality code') was
      stripped to the bare minimum  and all configurability removed in
      the  name  of speed  and  simplicity.   The configurability  was
      mainly aimed  at legacy  fonts like Arial,  Times New  Roman, or
      Courier.  [Legacy fonts are fonts  that modify vertical stems to
      achieve clean black-and-white bitmaps.]  The new mode focuses on
      applying a minimal set of rules to all fonts indiscriminately so
      that modern and web fonts  render well while legacy fonts render
      okay.

      Activation  of the  subpixel hinting  support can  be controlled
      with   the   `TT_CONFIG_OPTION_SUBPIXEL_HINTING'   configuration
      option  at compile  time: If  set to  value 1,  you get  the old
      Infinality  mode  (which  was  never  the  default  due  to  its
      slowness).  Value 2 activates the new subpixel hinting mode, and
      value 3 activates both.  The default is value 2.

      At run time,  you can select the subpixel hinting  mode with the
      `interpreter-version'  property (provided  you have  compiled in
      the corresponding hinting mode); see `ftttdrv.h' for more.

    - Support  for  the  following  scripts  has  been  added  to  the
      auto-hinter.

        Armenian, Cherokee, Ethiopic, Georgian, Gujarati, Gurmukhi,
        Malayalam, Sinhala, Tamil


  II. MISCELLANEOUS

    - Type 42 fonts as created by LilyPond are now supported.

    - Minor rendering improvements in the auto-hinter.

    - For experimental  reasons, the old  CFF engine now  supports all
      CFF operators except `random', including the deprecated Multiple
      Masters  instructions.  This  allows the  display of  fonts like
      `ITCGaramondMM-It.otf' (without font variations, though).

    - Another round of fixes to improve handling of invalid fonts.

    - The `ftgrid' demo program now displays the rendered pixels also;
      this can be switched off with the `b' key.  Selection of various
      LCD filtering modes can be done with the `L' key.

    - The demo programs  have been extended to allow  selection of all
      available TrueType bytecode engines.

    - A very early beta version of a new, Qt based demo program called
      `ftinspect'  is  part  of  the   source  code  bundle;  it  will
      eventually supersede  the other  demo programs.   Currently, you
      have to compile  it manually with `qmake; make';  note that many
      features are still missing.


======================================================================

CHANGES BETWEEN 2.6.2 and 2.6.3

  I. IMPORTANT CHANGES

    - Khmer,  Myanmar, Bengali,  and Kannada  script support  has been
      added to the auto-hinter.


  II. MISCELLANEOUS

    - Better  support of  Indic  scripts like  Devanagari  by using  a
      top-to-bottom hinting flow.

    - All  FreeType macros  starting  with two  underscores have  been
      renamed to  avoid a violation of  both the C and  C++ standards.
      Example: Header  macros of the  form `__FOO_H__' are  now called
      `FOO_H_'.  In most cases,  this should be completely transparent
      to the user.   The exception to this  is `__FTERRORS_H__', which
      must be  sometimes undefined by  the user to get  FreeType error
      strings:  Both this  form and  the new  `FTERRORS_H_' macro  are
      accepted for backward compatibility.

    - Minor improvements mainly to the Type 1 driver.

    - The  new CFF  engine now  supports all  Type 2  operators except
      `random'.

    - The macro `_STANDALONE_', used for  compiling the B/W and smooth
      rasterizers  as   stand-alone  modules,  has  been   renamed  to
      `STANDALONE_', since macro names starting with an underscore and
      followed by an uppercase letter are reserved in both C and C++.

    - Function  `FT_Library_SetLcdFilterWeights'  now  also  activates
      custom LCD filter weights (instead of just adjusting them).

    - Support for  `unpatented hinting'  has been  completely removed:
      Consequently,  the two  functions `FT_Face_CheckTrueTypePatents'
      and  `FT_Face_SetUnpatentedHinting'  now  return  always  false,
      doing nothing.

    - The `ftgamma' demo  program has been modernized;  the gamma grid
      display has been moved from `ftview' to this program.

    - In `ftview',  it is now possible to cycle through  the available
      LCD filtering modes.


======================================================================

CHANGES BETWEEN 2.6.1 and 2.6.2

  I. IMPORTANT CHANGES

    - The auto-hinter now supports stem darkening, to be controlled by
      the    new   `no-stem-darkening'    and   `darkening-parameters'
      properties.   This is  an  experimental  feature contributed  by
      Nikolaus Waxweiler, and  the interface might change  in a future
      release.

    - By default, stem darkening is now switched off (for both the CFF
      engine and the  auto-hinter).  The main reason is  that you need
      linear  alpha  blending  and  gamma correction  to  get  correct
      rendering results, and  the latter is not yet  available in most
      freely  available  rendering  stacks like  X11.   Applying  stem
      darkening without proper gamma correction  leads to far too dark
      rendering results.

    - The   meaning  of   `FT_RENDER_MODE_LIGHT'  has   been  slightly
      modified.   It  now  essentially  means `no  hinting  along  the
      horizontal  axis'; in  particular,  no change  of glyph  advance
      widths.  Consequently, the auto-hinter  is used for all scalable
      font  formats  except  for  CFF.    It  is  planned  that  other
      font-specific rendering engines (TrueType, Type 1) will follow.


  II. MISCELLANEOUS

    - The default  LCD filter  has been changed  to be  normalized and
      color-balanced.

    - For    better    compatibility   with    FontConfig,    function
      `FT_Library_SetLcdFilter'  accepts   a  new   enumeration  value
      `FT_LCD_FILTER_LEGACY1'   (which  has   the   same  meaning   as
      `FT_LCD_FILTER_LEGACY').

    - A large number of bugs have been detected by using the libFuzzer
      framework,  which should  further  improve  handling of  invalid
      fonts.  Thanks again to Kostya Serebryany and Bungeman!

    - `TT_CONFIG_OPTION_MAX_RUNNABLE_OPCODES',  a   new  configuration
      option, controls the maximum number of executed opcodes within a
      bytecode program.  You don't want to change this except for very
      special  situations (e.g.,  making a  library fuzzer  spend less
      time to handle broken fonts).

    - The smooth renderer has been made faster.

    - The `ftstring'  demo program  now supports  sub-pixel rendering;
      use key `l' to cycle through the LCD modes.

    - The `ftstring'  demo program now supports  colour rendering; use
      the `space' key to cycle through various colour combinations.

    - The graphical demo programs now use a default gamma value of 1.8
      (instead of 1.2).


======================================================================

CHANGES BETWEEN 2.6 and 2.6.1

  I. IMPORTANT BUG FIXES

    - It turned  out that for CFFs  only the advance widths  should be
      taken from the  `htmx' table, not the side  bearings.  This bug,
      introduced in  version 2.6.0, makes  it necessary to  upgrade if
      you are using  CFFs; otherwise, you get cropped  glyphs with GUI
      interfaces like GTK or Qt.

    - Accessing Type 42 fonts returned  incorrect results if the glyph
      order of the embedded TrueType font differs from the glyph order
      of the Type 42 charstrings table.


  II. IMPORTANT CHANGES

    - The header  file layout  has been  changed (again),  moving  all
      header files except `ft2build.h' into a subdirectory tree.

      Doing so  reduces the  possibility of  header file  name clashes
      (e.g., FTGL's  `FTGlyph.h' with FreeType's `ftglyph.h')  on case
      insensitive file systems like Mac OS X or Windows.

      Applications  that  use  (a)  the  `freetype-config'  script  or
      FreeType's `freetype2.pc' file for pkg-config to get the include
      directory  for the  compiler,  and (b)  the  documented way  for
      header inclusion like

        #include <ft2build.h>
        #include FT_FREETYPE_H
        ...

      don't need any change to the source code.

    - Simple access  to named instances  in GX variation fonts  is now
      available (in addition to the  previous method via FreeType's MM
      interface).   In  the `FT_Face'  structure,  bits  16-30 of  the
      `face_index' field hold the current named instance index for the
      given face  index, and bits  16-30 of `style_flags'  contain the
      number of  instances for  the given face  index.  `FT_Open_Face'
      and friends also understand the  extended bits of the face index
      parameter.

      You need to enable  TT_CONFIG_OPTION_GX_VAR_SUPPORT for this new
      feature.  Otherwise, bits  16-30 of the two fields  are zero (or
      are ignored).

    - Lao script support has been added to the auto-hinter.


  III. MISCELLANEOUS

    - The auto-hinter's Arabic script support has been enhanced.

    - Superscript-like and  subscript-like glyphs  as used  by various
      phonetic alphabets like the IPA  are now better supported by the
      auto-hinter.

    - The TrueType bytecode interpreter now runs slightly faster.

    - Improved support for builds with cmake.

    - The  function  `FT_CeilFix'  now   always  rounds  towards  plus
      infinity.

    - The  function  `FT_FloorFix'  now always  rounds  towards  minus
      infinity.

    - A  new load  flag `FT_LOAD_COMPUTE_METRICS'  has been  added; it
      makes FreeType  ignore pre-computed  metrics, as needed  by font
      validating  or  font  editing  programs.  Right  now,  only  the
      TrueType  module supports  it  to ignore  data  from the  `hdmx'
      table.

    - Another round of bug fixes  to better handle broken fonts, found
      by Kostya Serebryany <kcc@google.com>.


======================================================================

CHANGES BETWEEN 2.5.5 and 2.6

  I. IMPORTANT CHANGES

    - Behdad  Esfahbod contributed  code  for improved  thread-safety,
      which results in the following model.

      * An `FT_Face' object can only be safely used from one thread at
        a time.

      * An `FT_Library'  object can  now be used  without modification
        from multiple threads at the same time.

      * `FT_Face' creation and destruction  with the same `FT_Library'
        object can only be done from one thread at a time.

      One can use a single  `FT_Library' object across threads as long
      as a mutex lock is used around `FT_New_Face' and `FT_Done_Face'.
      Any calls to `FT_Load_Glyph' and similar API are safe and do not
      need the lock  to be held as  long as the same  `FT_Face' is not
      used from multiple threads at the same time.

    - Thai script support has been added to the auto-hinter.

    - Arabic script support has been added to the auto-hinter.

    - Following OpenType version 1.7,  advance widths and side bearing
      values in  CFFs (wrapped  in an SFNT  structure) are  now always
      taken from the `hmtx' table.

    - Following OpenType  version 1.7, the  PostScript font name  of a
      CFF font (wrapped in an SFNT structure) is now always taken from
      the `name'  table.  This is  also true for  OpenType Collections
      (i.e., TTCs using  CFFs subfonts instead of TTFs),  where it may
      have a significant difference.

    - Fonts natively hinted for  ClearType are now supported, properly
      handling selector index 3 of the INSTCTRL bytecode instruction.

    - Major improvements to the GX TrueType variation font handling.


  II. MISCELLANEOUS

    - A new auto-hinter  property `warping' can switch on  and off the
      warping code  if this  experimental feature  is compiled  in (by
      defining  the AF_CONFIG_OPTION_USE_WARPER  configuration option;
      by default  this option is  now enabled but warping  is switched
      off).

      The AF_CONFIG_OPTION_USE_WARPER option itself is an old feature,
      available   since  2006.    Warping   only   works  in   `light'
      auto-hinting mode.   The idea of  the code is to  slightly scale
      and  shift a  glyph  along the  non-hinted  dimension (which  is
      usually the horizontal axis) so that as much of its segments are
      aligned  (more or  less) to  the grid.   To find  out a  glyph's
      optimal   scaling   and   shifting  value,   various   parameter
      combinations are tried and scored.

      See  file  `ftautoh.h' for  more;  the  demo programs  `ftdiff',
      `ftview', and `ftgrid' can toggle warping with key `w'.

    - Some  fields  in  the  `FTC_ImageTypeRec'  structure  have  been
      changed from signed to unsigned  type, which better reflects the
      actual usage.  It is also an additional means to protect against
      malformed input.

      This  change doesn't  break  the ABI;  however,  it might  cause
      compiler warnings.

    - Function `FT_Bitmap_New'  has been renamed  to `FT_Bitmap_Init',
      since  this name  better reflects  its  function.   For backward
      compatibility, the old function name is still available.

    - Function   `FT_Get_X11_Font_Format'   has    been   renamed   to
      `FT_Get_Font_Format',  since  this   name  better  reflects  its
      function.  For backward compatibility,  the old function name is
      still available.

      Additionally, the header  file macro for this  function has been
      renamed to  `FT_FONT_FORMATS_H' (the old name  `FT_XFREE86_H' is
      retained for backward compatibility).

    - Various improvements to the `ftgrid' demo program.

      . It  can  now  display  GX and  MM  fonts  while  interactively
        manipulating the axes (with keys F2, F3, and F4).

      . Anti-aliasing rendering  modes can now be  selected (with keys
        F5 and F6).

      . The display of point numbers can be toggled with key `D'.

    - Various improvements to the `ftdump' demo program.

      . It now displays information on MM and GX variation axes.

      . New  command line option  `-u' makes  it output data  in utf-8
        encoding.

    - The `ftmulti'  demo program can  now handle up  to six MM  or GX
      axes.


======================================================================

CHANGES BETWEEN 2.5.4 and 2.5.5

  I. IMPORTANT BUG FIXES

    - Handling of  uncompressed PCF files works again (bug  introduced
      in version 2.5.4).


======================================================================

CHANGES BETWEEN 2.5.3 and 2.5.4

  I. IMPORTANT BUG FIXES

    - A   variant  of   vulnerability  CVE-2014-2240   was  identified
      (cf.  https://savannah.nongnu.org/bugs/?43661) and  fixed in the
      new CFF driver.  All users should upgrade.

    - The new auto-hinter code using HarfBuzz crashed for some invalid
      fonts.

    - Many fixes to better protect against malformed input.


  II. IMPORTANT CHANGES

    - Full auto-hinter support of the Devanagari script.

    - Experimental auto-hinter support of the Telugu script.

    - CFF stem darkening behaviour can now be controlled at build time
      using the eight macros

        CFF_CONFIG_OPTION_DARKENING_PARAMETER_{X,Y}{1,2,3,4}    .

    - Some fields in the `FT_Bitmap'  structure have been changed from
      signed to unsigned type, which better reflects the actual usage.
      It  is also  an additional  means to  protect against  malformed
      input.

      This  change doesn't  break  the ABI;  however,  it might  cause
      compiler warnings.


  III. MISCELLANEOUS

    - Improvements to  the auto-hinter's algorithm to  recognize stems
      and local extrema.

    - Function `FT_Get_SubGlyph_Info' always returned an error even in
      case of success.

    - Version  2.5.1 introduced  major bugs  in  the cjk  part of  the
      auto-hinter, which are now fixed.

    - The  `FT_Sfnt_Tag'  enumeration  values  have  been  changed  to
      uppercase,  e.g.  `FT_SFNT_HEAD'.   The lowercase  variants  are
      deprecated.    This  is   for  orthogonality   with  all   other
      enumeration (and enumeration-like) values in FreeType.

    - `cmake' now supports builds of FreeType as an OS X framework and
      for iOS.

    - Improved project files for vc2010, introducing a property file.

    - The  documentation generator  for  the API  reference  has  been
      updated to produce  better HTML code (with proper  CSS).  At the
      same time, the documentation got a better structure.

    - The FT_LOAD_BITMAP_CROP flag is obsolete;  it is not used by any
      driver.

    - The  TrueType  DELTAP[123]  bytecode instructions  now  work  in
      subpixel hinting  mode as described in  the ClearType whitepaper
      (i.e., for touched points in the non-subpixel direction).

    - Many small improvements to the internal arithmetic routines.


======================================================================

CHANGES BETWEEN 2.5.2 and 2.5.3

  I. IMPORTANT BUG FIXES

    - A vulnerability (CVE-2014-2240) was  identified and fixed in the
      new  CFF driver  (cf.  https://savannah.nongnu.org/bugs/?41697).
      All users should upgrade.

    - More  bug  fixes related  to  correct  positioning of  composite
      glyphs.

    - Many fixes to better protect against malformed input.


  II. IMPORTANT CHANGES

    - FreeType can now use the HarfBuzz library to greatly improve the
      auto-hinting of  fonts that  use OpenType features:  Many glyphs
      that are part  of such features but don't have  cmap entries are
      now handled  properly, for  example small caps  or superscripts.
      Define the configuration  macro FT_CONFIG_OPTION_USE_HARFBUZZ to
      activate HarfBuzz support.

      You need HarfBuzz version 0.9.19 or newer.

      Note that HarfBuzz depends on  FreeType; this currently causes a
      chicken-and-egg problem  that can be  solved as follows  in case
      HarfBuzz is not yet installed on your system.

        1. Compile  and  install  FreeType without  the  configuration
           macro FT_CONFIG_OPTION_USE_HARFBUZZ.

        2. Compile and install HarfBuzz.

        3. Define  macro  FT_CONFIG_OPTION_USE_HARFBUZZ, then  compile
           and install FreeType again.

      With FreeType's  `configure' script the procedure  boils down to
      configure, build, and install FreeType, then configure, compile,
      and  install  HarfBuzz,  then configure,  compile,  and  install
      FreeType again (after executing `make distclean').

    - All  libraries FreeType  depends on  are now  checked using  the
      `pkg-config' configuration files  first, followed by alternative
      methods.

    - The  new  value  `auto'  for the  various  `--with-XXX'  library
      options   (for   example   `--with-harfbuzz=auto')   makes   the
      `configure' script automatically link to the libraries it finds.
      This is now the default.

    - In case FreeType's `configure' script  can't find a library, you
      can  pass environment  variables to  circumvent pkg-config,  and
      those variables  have been  harmonized as  a consequence  of the
      changes mentioned above:

        LIBZ           -> removed; use LIBZ_CFLAGS and LIBZ_LIBS
        LIBBZ2         -> removed; use BZIP2_CFLAGS and BZIP2_LIBS
        LIBPNG_LDFLAGS -> LIBPNG_LIBS

      `./configure --help' shows all available environment variables.

    - The `freetype-config'  script now understands  option `--static'
      to emit static linking information.


======================================================================

CHANGES BETWEEN 2.5.1 and 2.5.2

  I. IMPORTANT BUG FIXES

    - Improving the display of some broken TrueType fonts introduced a
      bug  that made  FreeType crash  on some  popular (but  not fully
      conformant) fonts like `ahronbd.ttf'.

    - Another round of improvements to correct positioning and hinting
      of composite glyphs in TrueType fonts.


  II. MISCELLANEOUS

    - Version  2.5.1  introduced a  bug  in  handling embedded  bitmap
      strikes of  TrueType fonts,  causing garbage display  under some
      circumstances.

    - The   `ftgrid'   demo   program    couldn't   be   compiled   in
      non-development builds.


======================================================================

CHANGES BETWEEN 2.5 and 2.5.1

  I. IMPORTANT BUG FIXES

    - For  some WinFNT  files,  the last  glyph  wasn't displayed  but
      incorrectly marked as invalid.

    - The vertical size of glyphs was  incorrectly set after a call to
      `FT_GlyphSlot_Embolden', resulting in clipped glyphs.

    - Many fields of the `PCLT' table in SFNT based fonts (if accessed
      with `FT_Get_Sfnt_Table') were computed incorrectly.

    - In TrueType fonts,  hinting of composite glyphs  could sometimes
      deliver  incorrect positions  of  components or  even  distorted
      shapes.


  II. IMPORTANT CHANGES

    - WOFF font format support has been added.

    - The auto-hinter now supports Hebrew.  Greek and Cyrillic support
      has been improved.

    - Support for the forthcoming `OS/2'  SFNT table version 5, as can
      be found e.g. in the `Sitka' font family for Windows 8.1.

    - The header  file layout  has been changed.   After installation,
      all files are now located in `<prefix>/include/freetype2'.

      Applications  that  use   (a)  `freetype-config'  or  FreeType's
      `pkg-config' file to get the include directory for the compiler,
      and (b) the documented way for header inclusion like

        #include <ft2build.h>
        #include FT_FREETYPE_H
        ...

      don't need any change to the source code.


  III. MISCELLANEOUS

    - The stem  darkening feature  of the  new CFF  engine can  now be
      fine-tuned with the new `darkening-parameters' property.

    - `ftgrid' has been updated to toggle various engines with the `H'
      key, similar to `ftview' and `ftdiff'.

    - The functionality of `ttdebug' has been greatly enhanced.

      . It now displays twilight, storage, and control value data; key
        `T' shows the twilight point  table, key `S' the storage data,
        and key `C' the control value table.

      . Some  keys  have  been  reassigned  from  lowercase  to  their
        uppercase equivalents; for example `q'  to quit the program is
        now `Q'.

      . Key `f' finishes the current function.

      . Key `R' restarts the debugger.

      . Keys `b' and `p' set a breakpoint.

      . Key `B' provides a function call backtrace.

    - Better support of ARMv7 and x86_64 processors.

    - Apple's `sbix' color bitmap format is now supported.

    - Improved   auto-hinter  rendering   for  many   TrueType  fonts,
      especially in the range 20-40ppem.

    - A  new face  flag  `FT_FACE_FLAG_COLOR' has  been  added (to  be
      accessed with the macro `FT_HAS_COLOR').

    - `FT_Gzip_Uncompress'   (modeled    after   zlib's   `uncompress'
      function)  has been  added; this  is a  by-product of  the newly
      added WOFF support.

    - Support for  a build with  `cmake' has been contributed  by John
      Cary <cary@txcorp.com>.

    - Support for x64  builds with Visual C++ has  been contributed by
      Kenneth Miller <kennethadammiller@yahoo.com>

    - Manual pages for most demo programs have been added.

    - The GETINFO bytecode instruction for TrueType fonts was buggy if
      used to retrieve subpixel hinting information.  It was necessary
      to set  selector bit 6  to get  results for selector  bits 7-10,
      which is wrong.

    - Improved computation  of emulated vertical metrics  for TrueType
      fonts.

    - Fixed horizontal start-up position of vertical phantom points in
      TrueType bytecode.


======================================================================

CHANGES BETWEEN 2.4.12 and 2.5

  I. IMPORTANT BUG FIXES

    - The cache manager function `FTC_Manager_Reset'  didn't flush the
      cache.


  II. IMPORTANT CHANGES

    - Behdad Esfahbod  (on behalf  of Google) contributed  support for
      color embedded bitmaps (eg. color emoji).

      A  new  load  flag,  FT_LOAD_COLOR, makes  FreeType  load  color
      embedded-bitmaps, following this draft specification

        https://color-emoji.googlecode.com/git/specification/v1.html

      which defines two new SFNT  tables, `CBDT' and `CBLC' (named and
      modeled  after  `EBDT'  and `EBLC',  respectively).   The  color
      bitmaps  are  stored in  the  new  FT_PIXEL_MODE_BGRA format  to
      represent BGRA  pre-multiplied sRGB  images.  If PNG  support is
      available,  PNG color  images as  defined in  the same  proposed
      specification are supported also.

      Note that  color bitmaps  are converted  to grayscale  if client
      didn't ask for color.

    - As  announced in  the  previous release,  the  old FreeType  CFF
      engine  is now  disabled by  default.  It  can be  conditionally
      compiled     by     defining     the     configuration     macro
      CFF_CONFIG_OPTION_OLD_ENGINE.

    - As announced in the previous release,  all code related to macro
      FT_CONFIG_OPTION_OLD_INTERNALS  has been removed,  thus becoming
      obsolete.


  III. MISCELLANEOUS

    - The  property API  (`FT_Property_Get' and  `FT_Property_Set') is
      now declared as stable.

      The  exception,   however,  are  the   experimental  auto-hinter
      properties `glyph-to-script-map' and `fallback-script' which are
      subject to change in a forthcoming release.

    - `ftview' has been updated to  support color embedded bitmaps; it
      can be toggled on and off  with key `c'.  The small cache toggle
      is now key `K'.

    - It  is now  possible  to  control the  version  of the  TrueType
      hinting engine  using the new `interpreter-version'  property of
      the  `truetype' module:  Versions 35  and 38  (the default)  are
      supported,  which  roughly  corresponds to  disable  and  enable
      subpixel hinting support, respectively.

      In  both  `ftview'  and  `ftdiff',  switching  between  the  two
      versions  can be  done  with  key `H'.   In  the `ftbench'  demo
      program, command line option `-H'  has been extended to activate
      the non-default interpreter version.

    - The `ttdebug' program has been further improved.  In particular,
      it accepts a new command line  option `-H' to select the hinting
      engine.

    - `ftdump's verbose option has been renamed to `-V'.  For all demo
      programs, `-v' now shows version information.

    - Another round of TrueType subpixel hinting fixes.

    - The `apinames' tool can now create an import file for NetWare.

    - 64bit compilation of the new CFF engine was buggy.

    - Some fixes to improve robustness in memory-tight situations.


======================================================================

CHANGES BETWEEN 2.4.11 and 2.4.12

    - We have another CFF parsing and hinting engine!  Written by Dave
      Arnold <darnold@adobe.com>,  this work  has been  contributed by
      Adobe in  collaboration with Google.   It is vastly  superior to
      the old CFF engine, and it  will replace it in the next release.
      Right  now,  it  is  still  off by  default,  and  you  have  to
      explicitly select it using  the new `hinting-engine' property of
      the cff driver:

        ...
        #include FT_MODULE_H
        #include FT_CFF_DRIVER_H

        FT_Library  library;
        int         engine = FT_CFF_HINTING_ADOBE;


        ...
        FT_Property_Set( library, "cff", "hinting-engine", &engine );

      The code has  a (mature) beta status; we encourage  all users to
      test it and report any problems.

      In case you want to activate the new CFF engine unconditionally,
      apply this patch:

--- snip ---
diff --git a/src/cff/cffobjs.c b/src/cff/cffobjs.c
index ebcf189..3f2ce6b 100644
--- a/src/cff/cffobjs.c
+++ b/src/cff/cffobjs.c
@@ -1056,7 +1056,7 @@


     /* set default property values */
-    driver->hinting_engine    = FT_CFF_HINTING_FREETYPE;
+    driver->hinting_engine    = FT_CFF_HINTING_ADOBE;
     driver->no_stem_darkening = FALSE;

     return FT_Err_Ok;
--- snip ---

    - The  macro FT_CONFIG_OPTION_OLD_INTERNALS  is no  longer set  by
      default.  In  the next  release, we  will completely  remove the
      associated code.   Please update your  programs in case  you are
      still using this macro.


  II. MISCELLANEOUS

    - The  (top-level)  `configure'  script   now  respects  the  MAKE
      environment variable  to specify a `make' binary.   For backward
      compatibility, GNUMAKE still overrides MAKE, though.

    - The `ftview'  and `ftdiff'  demo programs have  been redesigned,
      showing  more options  permanently  on the  screen, among  other
      minor improvements.

    - Using the `H'  key, it is now possible to  select the CFF engine
      in both `ftview' and `ftdiff'.

    - The new command line option `-H' for `ftbench' selects the Adobe
      CFF engine.

    - It is  now possible  to directly select  the LCD  rendering mode
      with the keys `A'-`F' in  `ftview'.  The key mapping for cycling
      through LCD modes  has been changed from `K' and  `L' to `k' and
      `l', and  toggling custom LCD  filtering is no longer  mapped to
      key `F' but to key `L'.

    - In `ftdiff',  key `x' toggles  between layout modes:  Either use
      the  advance width  (this is  new and  now the  default) or  the
      bounding box information to determine line breaks.

    - For all demo  tools, the new command line option  `-v' shows the
      version.

    - For the demo tools with a GUI, the new command line options `-w'
      and `-h' select  the width and the height of  the output window,
      respectively.

    - The `ttdebug' program was broken and has been reactivated.  Note
      that this program is not compiled by default.


======================================================================

CHANGES BETWEEN 2.4.10 and 2.4.11

  I. IMPORTANT BUG FIXES

    - Some vulnerabilities in the  BDF implementation have been fixed.
      Users of this font format should upgrade.


  II. IMPORTANT CHANGES

    - Subpixel  hinting support  has been  contributed by  Infinality,
      based on Greg Hitchcock's whitepaper at

        https://www.microsoft.com/typography/cleartype/truetypecleartype.aspx

      Originally, it was a separate patch available from

        http://www.infinality.net/blog/

      and which has been integrated.

      Note that  ClearType support is not  completely implemented!  In
      particular,  full support  for the  options `compatible_widths',
      `symmetrical_smoothing,  and  `bgr'  (via the  GETINFO  bytecode
      instruction) is missing.

      Activation of  subpixel hinting  support can be  controlled with
      the `TT_CONFIG_OPTION_SUBPIXEL_HINTING' configuration option; it
      is switched off by default.  This feature is still experimental;
      we welcome test reports!

    - Support for OpenType collections (OTC) has been added.

    - Pure CFF fonts within an SFNT wrapper are now supported.


  III. MISCELLANEOUS

    - Minor rendering improvements to the auto-hinter.

    - `FT_GlyphSlot_Oblique' now uses a shear angle of 12°.

    - Experimental support  to handle `property modules',  for example
      to control the  behaviour of the auto-hinter.   The API consists
      of two new functions, `FT_Property_Set' and `FT_Property_Get'.

      The code is  still subject to change and should  not be used for
      production.

    - The `ftdiff' demo program now supports UTF-8 encoded input files
      for option `-f'.

    - Using keys `r' and `R', you can now adjust the stroker radius in
      the `ftview' demo program.

    - Other, minor fixes and improvements.


======================================================================

CHANGES BETWEEN 2.4.9 and 2.4.10

  I. IMPORTANT BUG FIXES

    - Incremental glyph loading as needed by ghostscript was broken.


  II. MISCELLANEOUS

    - A new  function `FT_Outline_EmboldenXY',  contributed by  Alexei
      Podtelezhnikov.

    - In the `ftview' demo program, key `e' has been replaced with `x'
      and `y' to  embolden in  the horizontal and  vertical direction,
      respectively.

    - The glyph  spacing computation  in `FT_GlyphSlot_Embolden'  (and
      similar code in `ftview') has been improved.

    - Minor  improvements to  the TrueType  bytecode  interpreter  and
      glyph loader, the auto-hinter, and the B/W rasterizer.


======================================================================

CHANGES BETWEEN 2.4.8 and 2.4.9

  I. IMPORTANT BUG FIXES

    - Another round of fixes to better handle invalid fonts.   Many of
      them are vulnerabilities  (see CVE-2012-1126 up to CVE-2012-1144
      and SA48320) so all users should upgrade.


  II. MISCELLANEOUS

    - The `ENCODING -1 <n>' format of BDF fonts is now supported.

    - For BDF fonts,  support for the whole Unicode encoding range has
      been added.

    - Better TTF support for x_ppem != y_ppem.

    - `FT_Get_Advances' sometimes returned bogus values.

    - The  demo  programs  no  longer  recognize  and  handle  default
      suffixes; you now have to always specify the complete font name.

    - Better rendering and LCD mode cycling added to `ftview'.


======================================================================

CHANGES BETWEEN 2.4.7 and 2.4.8

  I. IMPORTANT BUG FIXES

    - Some vulnerabilities in handling CID-keyed PostScript fonts have
      been fixed; see CVE-2011-3439.


  II. MISCELLANEOUS

    - Chris Liddell contributed a new API, `FT_Get_PS_Font_Value',  to
      retrieve most of the dictionary keys in Type 1 fonts.


======================================================================

CHANGES BETWEEN 2.4.6 and 2.4.7

  I. IMPORTANT BUG FIXES

    - Some  vulnerabilities in handling Type 1 fonts  have been fixed;
      see CVE-2011-3256.


  II. MISCELLANEOUS

    - FreeType  now properly  handles ZapfDingbats  glyph names  while
      constructing a Unicode character map (for fonts which don't have
      one).


======================================================================

CHANGES BETWEEN 2.4.5 and 2.4.6

  I. IMPORTANT BUG FIXES

    - For TrueType based fonts, the ascender and descender values were
      incorrect sometimes  (off by a pixel if the ppem value was not a
      multiple of 5).   Depending on the use you might now  experience
      a different  layout; the  change should  result in  better, more
      consistent line spacing.

    - Fix CVE-2011-0226  which causes a  vulnerability while  handling
      Type 1 fonts.

    - BDF fonts  containing  glyphs with negative values  for ENCODING
      were  incorrectly  rejected.  This  bug has  been introduced  in
      FreeType version 2.2.0.

    - David Bevan contributed a major revision of the FreeType stroker
      code:

      . The behaviour of FT_STROKER_LINEJOIN_BEVEL has been corrected.

      . A new  line join style,  FT_STROKER_LINEJOIN_MITER_FIXED,  has
        been introduced to support PostScript and PDF miter joins.

      . FT_STROKER_LINEJOIN_MITER_VARIABLE  has been introduced  as an
        alias for FT_STROKER_LINEJOIN_MITER.

      . Various stroking glitches has been fixed.


  II. MISCELLANEOUS

      - SFNT bitmap fonts which contain an outline glyph for `.notdef'
        only no longer set the FT_FACE_FLAG_SCALABLE flag.


======================================================================

CHANGES BETWEEN 2.4.4 and 2.4.5

  I. IMPORTANT BUG FIXES

    - A rendering regression  for second-order Bézier curves  has been
      fixed, introduced in 2.4.3.


  II. IMPORTANT CHANGES

    - If autohinting  is not  explicitly disabled,  FreeType now  uses
      the autohinter if  a TrueType based font doesn't  contain native
      hints.

    - The load flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH  has been made
      redundant and  is simply ignored;  this means that FreeType  now
      ignores the global advance width value in TrueType fonts.


  III. MISCELLANEOUS

    - `FT_Sfnt_Table_Info' can now return the number of SFNT tables of
      a font.

    - Support for PCF files compressed with bzip2 has been contributed
      by Joel  Klinghed.  To  make this  work, the  OS must  provide a
      bzip2 library.

    - Bradley  Grainger  contributed  project  and  solution  files in
      Visual Studio 2010 format.

    - Again some fixes to better handle broken fonts.

    - Some improvements to the B/W rasterizer.

    - Fixes to the cache module to improve robustness.

    - Just  Fill Bugs contributed (experimental) code to compute  blue
      zones for CJK Ideographs, improving the alignment of  horizontal
      stems at the top or bottom edges.

    - The `ftgrid' demo program  can now display  autohinter segments,
      to be toggled on and off with key `s'.


======================================================================

CHANGES BETWEEN 2.4.3 and 2.4.4

  I. IMPORTANT BUG FIXES

    - UVS support (TrueType/OpenType cmap format 14) support is fixed.
      This regression has been introduced in version 2.4.0.


  II. MISCELLANEOUS

    - Detect tricky fonts (e.g. MingLiU)  by the lengths and checksums
      of Type42-persistent subtables (`cvt ', `fpgm', and `prep') when
      a TrueType font without family name is given.  The previous fix,
      introduced in 2.4.3,  was too rigorous,  causing many  subsetted
      fonts (mainly  from PDF files) displayed badly  because FreeType
      forced  rendering with  the TrueType bytecode engine  instead of
      the autohinter.

    - Better support for 64bit platforms.

    - More fixes to improve handling of broken fonts.


======================================================================

CHANGES BETWEEN 2.4.2 and 2.4.3

  I. IMPORTANT BUG FIXES

    - Fix rendering of certain cubic, S-shaped arcs.   This regression
      has been introduced in version 2.4.0.


  II. MISCELLANEOUS

    - To  fix  the  above  mentioned  rendering  issue,  a  new spline
      flattening algorithm  has been  introduced which  speeds up both
      conic and cubic arcs.

    - Handling of broken fonts has been further improved.


======================================================================

CHANGES BETWEEN 2.4.1 and 2.4.2

  I. IMPORTANT BUG FIXES

    - A stack overflow in CFF Type2 CharStrings interpreter is fixed.

    - Handling Type 42 font deallocation was broken; additionally, the
      library is now more robust against malformed Type 42 fonts.


  II. MISCELLANEOUS

    - Two new functions,  `FT_Reference_Library' (in FT_MODULE_H)  and
      `FT_Reference_Face'  (in  FT_FREETYPE_H),  have  been  added  to
      simplify life-cycle management.  A counter gets initialized to 1
      at the  time an  FT_Library (or  FT_Face) structure  is created.
      The  two  new   functions  increment  the  respective   counter.
      `FT_Done_Library' and `FT_Done_Face' then only destroy a library
      or face if the counter is 1, otherwise they simply decrement the
      counter.


======================================================================

CHANGES BETWEEN 2.4.0 and 2.4.1

  I. IMPORTANT CHANGES

    - A serious bug in the  CFF font module prevented  display of many
      glyphs in CFF fonts like `MinionPro-Regular.otf'.


======================================================================

CHANGES BETWEEN 2.3.12 and 2.4.0

  I. IMPORTANT CHANGES

    - Since May  2010, all  patents  regarding  the TrueType  bytecode
      interpreter have expired worldwide.  Consequently, we now define
      TT_CONFIG_OPTION_BYTECODE_INTERPRETER by  default (and  undefine
      TT_CONFIG_OPTION_UNPATENTED_HINTING).

    - A new function `FT_Library_SetLcdFilterWeights' is available  to
      adjust the filter weights set by `FT_Library_SetLcdFilter'.


  II. MISCELLANEOUS

    - Thanks to many reports from Robert Święcki, FreeType's stability
      in handling broken or damaged fonts is much improved.

    - Support  for LCD  filter  control has  been  added to  the  demo
      programs `ftdiff' and `ftview'.


======================================================================

CHANGES BETWEEN 2.3.11 and 2.3.12

  I. IMPORTANT CHANGES

    - For  `FT_Open_Face',  new  parameters  are  available  to ignore
      preferred family names: FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY and
      FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY.


  II. MISCELLANEOUS

    - Support  for  incremental  font  loading  (controlled  with  the
      FT_CONFIG_OPTION_INCREMENTAL macro) is now active by default.

    - Better support for vertical metrics.

    - Various minor bug fixes.


======================================================================

CHANGES BETWEEN 2.3.10 and 2.3.11

  I. IMPORTANT BUG FIXES

    - Version 2.3.10 broke PCF support.


======================================================================

CHANGES BETWEEN 2.3.10 and 2.3.9

  I. IMPORTANT BUG FIXES

    - If all  ASCII digits in a  font have the  same (unscaled) width,
      the autohinter respects this and won't change it.

    - TrueType fonts  are now  rasterized correctly  if the horizontal
      and vertical resolution differ.

    - Type 1 fonts are now handled with increased precision internally
      to avoid serious rounding issues if non-integral coordinates are
      encountered.

    - Horizontally  condensed CFF  fonts (using the font  matrix) were
      rendered  incorrectly.   This  bug  has  been  introduced  after
      release 2.3.5.


  II. IMPORTANT CHANGES

    - Support for the SFNT cmap 13 table format (as defined by the new
      OpenType 1.6 specification) has been added.

    - B/W rasterization  of well-hinted TrueType  fonts at small sizes
      has been greatly improved.

    - Calculation  of  vertical  metrics in  OpenType  fonts has  been
      improved.


  III. MISCELLANEOUS

    - It  is now  possible to  change  the emboldening  factor in  the
      `ftview' demo program with keys `e' and `E'.

    - It is  now possible  to change the  slant value in  the `ftview'
      demo program with keys `s' and `S'.

    - The  5-levels  grayscale  mode of  the `ftraster'  module (which
      FreeType doesn't use by default) was broken since version 2.3.0.

    - Compilation of the  `ftgrays' and `ftraster' modules  was broken
      in stand-alone mode.

    - Various fixes for compilation on 64bit and 16bit architectures.


======================================================================

CHANGES BETWEEN 2.3.9 and 2.3.8

  I. IMPORTANT BUG FIXES

    - Very unfortunately, FreeType 2.3.8 contained a change that broke
      its  official ABI.  The  end result  is  that programs  compiled
      against previous versions of the library, but dynamically linked
      to  2.3.8 can  experience  memory corruption  if  they call  the
      `FT_Get_PS_Font_Info' function.

      We recommend all users to  upgrade to 2.3.9 as soon as possible,
      or to downgrade to a previous  release of the library if this is
      not an option.

      The  origin of the  bug is  that a  new field  was added  to the
      publicly  defined  `PS_FontInfoRec'  structure.   Unfortunately,
      objects of this  type can be stack or  heap allocated by callers
      of   `FT_Get_PS_Font_Info',  resulting   in   a  memory   buffer
      overwrite with its implementation in 2.3.8.

      If  you want to  know whether  your code  is vulnerable  to this
      issue,  simply  search  for  the  substrings  `PS_FontInfo'  and
      `PS_Font_Info' in your source code.  If none is found, your code
      is safe and is not affected.

      The FreeType team apologizes for the problem.

    - The POSIX support  of MacOS resource-fork fonts  (Suitcase fonts
      and LaserWriter Type1 PostScript fonts) was broken in 2.3.8.  If
      FreeType2 is built without Carbon framework, these fonts are not
      handled correctly.  Version 2.3.7 didn't have this bug.

    - `FT_Get_Advance' (and `FT_Get_Advances') returned bad values for
      almost all font formats except TrueType fonts.

    - Fix a bug  in the SFNT  kerning table  loader/parser which could
      crash the engine if certain malformed tables were encountered.

    - Composite SFNT bitmaps are now handled correctly.


  II. IMPORTANT CHANGES

    - The   new  functions   `FT_Get_CID_Is_Internally_CID_keyed'  and
      `FT_Get_CID_From_Glyph_Index'  can be  used to  access CID-keyed
      CFF fonts  via CID  values.  This code  has been  contributed by
      Michael Toftdal.


  III. MISCELLANEOUS

    - `FT_Outline_Get_InsideBorder'  returns   FT_STROKER_BORDER_RIGHT
      for empty outlines.  This was incorrectly documented.

    - The `ftview' demo program now supports UTF-8 encoded strings.


======================================================================

CHANGES BETWEEN 2.3.8 and 2.3.7

  I. IMPORTANT BUG FIXES

    - CID-keyed fonts in an SFNT wrapper were not handled correctly.

    - The smooth renderer produced truncated images (on the right) for
      outline parts with negative horizontal values.  Most fonts don't
      contain outlines left  to the y coordinate axis, but  the effect
      was very noticeable for outlines processed with FT_Glyph_Stroke,
      using thick strokes.

    - `FT_Get_TrueType_Engine_Type'  returned a  wrong  value if  both
      configuration  macros  TT_CONFIG_OPTION_BYTECODE_INTERPRETER and
      TT_CONFIG_OPTION_UNPATENTED_HINTING were defined.

    - The  `face_index'  field  in   the  `FT_Face'  structure  wasn't
      initialized properly after calling FT_Open_Face and friends with
      a positive face index for CFFs,  WinFNTs, and, most importantly,
      for TrueType Collections (TTCs).


  II. IMPORTANT CHANGES

    - Rudimentary support for Type 1  fonts and CID-keyed Type 1 fonts
      in an SFNT wrapper has been  added -- such fonts are used on the
      Mac.  The core  SFNT tables `TYP1' and `CID '  are passed to the
      PS Type 1  and CID-keyed PS font drivers;  other tables (`ALMX',
      `BBOX', etc.) are not supported yet.

    - A  new interface  to extract  advance values  of glyphs  without
      loading their outlines has been added.  The functions are called
      `FT_Get_Advance' and `FT_Get_Advances'; they are defined in file
      `ftadvanc.h' (to be accessed as FT_ADVANCES_H).

    - A new function `FT_Get_FSType_Flags' (in FT_FREETYPE_H) has been
      contributed  by   David  Bevan  to  access   the  embedding  and
      subsetting restriction information of fonts.


  III. MISCELLANEOUS

    - FT_MulFix is now an inlined function; by default, assembler code
      is provided for x86 and ARM.  See FT_CONFIG_OPTION_INLINE_MULFIX
      and FT_CONFIG_OPTION_NO_ASSEMBLER (in ftoption.h) for more.

    - The handling of `tricky' fonts  (this is, fonts which don't work
      with the  autohinter, needing the font  format's hinting engine)
      has been generalized and changed slightly:

      . A new  face flag  FT_FACE_FLAG_TRICKY indicates that  the font
        format's  hinting engine is  necessary for  correct rendering.
        The macro FT_IS_TRICKY can be used to check this flag.

      . FT_LOAD_NO_HINTING is now ignored for tricky fonts.  To really
        force  raw  loading  of  such fonts  (without  hinting),  both
        FT_LOAD_NO_HINTING  and FT_LOAD_NO_AUTOHINT  must  be used  --
        this is something which you probably never want to do.

      . Tricky  TrueType fonts  always use  the  bytecode interpreter,
        either the patented or unpatented version.

    - The  function  `FT_GlyphSlot_Own_Bitmap'  has  been  moved  from
      FT_SYNTHESIS_H to FT_BITMAP_H; it  is now part of the `official'
      API.   (The functions  in  FT_SYNTHESIS_H are  still subject  to
      change, however.)

    - In the  `ftdiff'  demo  program you  can now  toggle the  use of
      FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH with key `a'.


======================================================================

CHANGES BETWEEN 2.3.7 and 2.3.6

  I. IMPORTANT BUG FIXES

    - If the library  was compiled on an i386  platform using gcc, and
      compiler  option -O3 was  given, `FT_MulFix'  sometimes returned
      incorrect  results   which  could  have   caused  problems  with
      `FT_Request_Metrics'   and  `FT_Select_Metrics',   returning  an
      incorrect descender size.

    - Pure CFFs without  subfonts were scaled incorrectly  if the font
      matrix  was  non-standard.  This  bug  has  been  introduced  in
      version 2.3.6.

    - The  `style_name'  field  in  the  `FT_FaceRec'  structure often
      contained  a wrong  value for  Type 1  fonts.  This misbehaviour
      has been  introduced  in  version  2.3.6  while  trying  to  fix
      another   problem.   [Note,  however,   that   this   value   is
      informative only  since  the  used  algorithm to  extract  it is
      very simplistic.]


  II. IMPORTANT CHANGES

    - Two      new      macros,      FT_OUTLINE_SMART_DROPOUTS     and
      FT_OUTLINE_EXCLUDE_STUBS,  have been introduced.   Together with
      FT_OUTLINE_IGNORE_DROPOUTS (which  was ignored previously) it is
      now possible to control the dropout mode  of the `raster' module
      (for B&W rasterization),   using  the   `flags'  field   in  the
      `FT_Outline' structure.

    - The TrueType bytecode interpreter now passes the dropout mode to
      the B&W rasterizer.  This greatly increases the output for small
      ppem values of many fonts like `pala.ttf'.


======================================================================

CHANGES BETWEEN 2.3.6 and 2.3.5

  I. IMPORTANT BUG FIXES

    - A  bunch of  potential security  problems have  been found.  All
      users should update.

    - Microsoft  Unicode  cmaps  in  TrueType  fonts  are  now  always
      preferred over Apple cmaps.  This is not a bug per se, but there
      exist some buggy  fonts created for MS which  have broken  Apple
      cmaps.  This affects  only the automatic  selection of FreeType;
      it's always possible to manually select an Apple Unicode cmap if
      desired.

    - Many bug fixes to the TrueType bytecode interpreter.

    - Improved Mac support.

    - Subsetted CID-keyed CFFs are now supported correctly.

    - CID-keyed CFFs with subfonts which are scaled in a  non-standard
      way are now handled correctly.

    - A call to FT_Open_Face with `face_index' < 0 crashed FreeType if
      the font was a Windows (bitmap) FNT/FON.


  II. IMPORTANT CHANGES

    - The new function `FT_Get_CID_Registry_Ordering_Supplement' gives
      access to  those fields in a CID-keyed font.  The code  has been
      contributed by Derek Clegg.

    - George Williams  contributed  code  to validate  the new  `MATH'
      OpenType  table (within  the `otvalid'  module).  The  `ftvalid'
      demo program has been extended accordingly.

    - An API for cmap 14 support  (for Unicode Variant Selectors, UVS)
      has been contributed by George Williams.

    - A new face flag FT_FACE_FLAG_CID_KEYED has been added,  together
      with a macro FT_IS_CID_KEYED which evaluates to 1 if the font is
      CID-keyed.


  III. MISCELLANEOUS

    - Build support for symbian has been contributed.

    - Better WGL4 glyph name support, contributed by Sergey Tolstov.

    - Debugging output of the  various FT_TRACEX macros is now sent to
      stderr.

    - The `ftview' demo program now provides artificial slanting too.

    - The `ftvalid' demo  program has a new  option `-f' to select the
      font index.


======================================================================

CHANGES BETWEEN 2.3.5 and 2.3.4

  I. IMPORTANT BUG FIXES

    - Some subglyphs in TrueType fonts were handled incorrectly due to
      a missing graphics state reinitialization.

    - Large .Z files  (as distributed with some X11  packages) weren't
      handled correctly, making FreeType increase the heap stack in an
      endless loop.

    - A large  number of  bugs have  been fixed  to avoid  crashes and
      endless loops with invalid fonts.


  II. IMPORTANT CHANGES

    - The  two new  cache functions  `FTC_ImageCache_LookupScaler' and
      `FTC_SBit_Cache_LookupScaler' have been added to allow lookup of
      glyphs using an  `FTC_Scaler' object;  this makes it possible to
      use fractional pixel sizes in the cache.  The demo programs have
      been updated accordingly to use this feature.

    - A new API  `FT_Get_CMap_Format' has been added to  get the  cmap
      format  of a  TrueType font.   This  is useful  in handling  PDF
      files.  The code has been contributed by Derek Clegg.

    - The  auto-hinter  now  produces  better  output  by  default for
      non-Latin scripts  like Indic.   This was done by  using the CJK
      hinting module  as the default instead of the Latin one.  Thanks
      to Rahul Bhalerao for this suggestion.

    - A new API `FT_Face_CheckTrueTypePatents'  has been added to find
      out  whether  a  given  TrueType  font  uses  patented  bytecode
      instructions.   The  `ft2demos' bundle  contains a  new  program
      called `ftpatchk' which demonstrates its usage.

    - A  new  API  `FT_Face_SetUnpatentedHinting'  has  been  added to
      enable or disable the unpatented hinter.

    - Support for Windows FON files in PE format  has been contributed
      by Dmitry Timoshkov.


  III. MISCELLANEOUS

    - Vincent Richomme contributed Visual C++ project files for Pocket
      PCs.


======================================================================

CHANGES BETWEEN 2.3.4 and 2.3.3

  I. IMPORTANT BUG FIXES

    - A serious  bug  in  the  handling  of bitmap  fonts (and  bitmap
      strikes of outline fonts) has been introduced in 2.3.3.


======================================================================

CHANGES BETWEEN 2.3.3 and 2.3.2

  I. IMPORTANT BUG FIXES

    - Remove a serious regression in the TrueType bytecode interpreter
      that was introduced  in version 2.3.2.  Note that  this does not
      disable  the  improvements  introduced  to  the  interpreter  in
      version 2.3.2,  only some ill  cases that occurred  with certain
      fonts (though a few popular ones).

    - The auto-hinter now  ignores single-point contours for computing
      blue zones.   This bug  created `wavy' baselines  when rendering
      text  with  various  fonts  that  use these  contours  to  model
      mark-attach points  (these are points that  are never rasterized
      and are placed outside of the glyph's real outline).

    - The `rsb_delta' and `lsb_delta' glyph slot fields are now set to
      zero for mono-spaced fonts.  Otherwise code that uses them would
      essentially ruin the fixed-advance property.

    - Fix  CVE-2007-1351 which  can  cause an  integer overflow  while
      parsing  BDF fonts,  leading to  a potentially  exploitable heap
      overflow condition.


  II. MISCELLANEOUS

    - Fixed compilation issues on some 64-bit platforms (see ChangeLog
      for details).

    - A new demo  program `ftdiff' has been added  to compare TrueType
      hinting, FreeType's auto  hinting, and rendering without hinting
      in three columns.


======================================================================

CHANGES BETWEEN 2.3.2 and 2.3.1

  I. IMPORTANT BUG FIXES

    - FreeType  returned incorrect  kerning information  from TrueType
      fonts when the bytecode  interpreter was enabled.  This happened
      due to a typo introduced in version 2.3.0.

    - Negative  kerning  values  from   PFM  files  are  now  reported
      correctly  (they were read  as 16-bit  unsigned values  from the
      file).

    - Fixed  a small  memory leak  when `FT_Init_FreeType'  failed for
      some reason.

    - The Postscript hinter placed and sized very thin and ghost stems
      incorrectly.

    - The TrueType bytecode  interpreter has been fixed to  get rid of
      most of the  rare differences seen in comparison  to the Windows
      font loader.


  II. IMPORTANT CHANGES

    - The auto-hinter  now better deals  with serifs and  corner cases
      (e.g.,  glyph '9'  in Arial  at 9pt,  96dpi).  It  also improves
      spacing  adjustments and doesn't  change widths  for non-spacing
      glyphs.

    - Many   Mac-specific   functions   are  deprecated   (but   still
      available);  modern replacements  have been  provided  for them.
      See the documentation in file `ftmac.h'.


======================================================================

CHANGES BETWEEN 2.3.1 and 2.3.0

  I. IMPORTANT BUG FIXES

    - The TrueType interpreter sometimes returned incorrect horizontal
      metrics due to a bug in the handling of the SHZ instruction.

    - A typo  in  a  security  check  introduced  after  version 2.2.1
      prevented FreeType to render some glyphs in CFF fonts.


======================================================================

CHANGES BETWEEN 2.3.0 and 2.2.1

  I. IMPORTANT BUG FIXES

    - The  PCF font  loader  is  now much  more  robust while  loading
      malformed font files.

    - Various memory leaks have been found and fixed.

    - The TrueType name loader now deals properly with some fonts that
      encode their  names in UTF-16 (the specification  was vague, and
      the code incorrectly assumed UCS-4).

    - Fixed the TrueType bytecode  loader to deal properly with subtle
      monochrome/gray  issues  when   scaling  the  CVT.   Some  fonts
      exhibited bad rendering artifacts otherwise.

    - `FT_GlyphSlot_Embolden' now  supports vertical layouts correctly
      (it mangled the vertical advance height).

    - Fixed byte  endian issues  of `ftmac.c' to  support Mac OS  X on
      i386.

    - The  PFR  font loader  no  longer  erroneously  tags font  files
      without any outlines as FT_FACE_FLAG_SCALABLE.


  II. NEW API FUNCTIONS

    - `FT_Library_SetLcdFilter' allows you  to select a special filter
      to be  applied to the bitmaps generated  by `FT_Render_Glyph' if
      one of the FT_RENDER_MODE_LCD and FT_RENDER_MODE_LCD_V modes has
      been  selected.  This filter  is used  to reduce  color fringes;
      several  settings are  available  through the  FT_LCD_FILTER_XXX
      enumeration.

      Its  declaration   and  documentation  can  be   found  in  file
      `include/freetype/ftlcdfil.h'   (to  be   accessed   with  macro
      FT_LCD_FILTER_H).

      *IMPORTANT*:     This      function     returns     an     error
      (FT_Err_Unimplemented_Feature) in default  builds of the library
      for patent reasons.  See below.

    - `FT_Get_Gasp'  allows you  to query  the flags  of  the TrueType
      `gasp' table for  a given character pixel size.   This is useful
      to duplicate  the text rendering  of MS Windows when  the native
      bytecode  interpreter is  enabled (which  isn't the  default for
      other patent reasons).

      Its  declaration   and  documentation  can  be   found  in  file
      `include/freetype/ftgasp.h'   (to   be   accessed   with   macro
      FT_GASP_H).


  III. IMPORTANT CHANGES

    - The auto-hinter has been tuned a lot to improve its results with
      serif fonts, resulting in much better font rendering of many web
      pages.

    - The unpatented  hinter is now part  of the default  build of the
      library; we  have added  code to automatically  support `tricky'
      fonts that need it.

      This means  that FreeType should `just work'  with certain Asian
      fonts, like  MingLiU, which cannot properly be  loaded without a
      bytecode interpreter,  but which fortunately  do not use  any of
      the patented  bytecode opcodes.  We detect these  fonts by name,
      so please  report any font file  that doesn't seem  to work with
      FreeType, and  we shall do what we  can to support it  in a next
      release.

      Note  that  the API  hasn't  changed,  so  you can  still  force
      unpatented hinting with a special parameter to `FT_Open_Face' as
      well.  This  might be useful in  same cases; for  example, a PDF
      reader might present  a user option to activate  it to deal with
      certain  `tricky'   embedded  fonts  which   cannot  be  clearly
      identified.

      If you are  a developer for embedded systems,  you might want to
      *disable*  the   feature  to  save  code   space  by  undefining
      TT_CONFIG_OPTION_UNPATENTED_HINTING in file `ftoption.h'.

    - LCD-optimized rendering is now  *disabled* in all default builds
      of  the  library,  mainly   due  to  patent  issues.   For  more
      information see:

      https://lists.gnu.org/archive/html/freetype/2006-09/msg00064.html

      A  new  configuration macro  FT_CONFIG_OPTION_SUBPIXEL_RENDERING
      has been introduced in  `ftoption.h'; manually define it in this
      file if you want to re-enable the feature.

      The  change only  affects the  implementation, not  the FreeType
      API.  This means that clients don't need to be modified, because
      the library still generates  LCD decimated bitmaps, but with the
      added constraint that R=G=B on each triplet.

      The  displayed result  should  be equal  to normal  anti-aliased
      rendering.

      Additionally,  if   FT_CONFIG_OPTION_SUBPIXEL_RENDERING  is  not
      defined, the new  `FT_Library_SetLcdFilter' function returns the
      FT_Err_Unimplemented_Feature error code.

    - Some computation bugs in  the TrueType bytecode interpreter were
      found,  which  allow us  to  get rid  of  very  subtle and  rare
      differences we had experienced with the Windows renderer.

    - It is now possible to cross-compile the library easily.  See the
      file `docs/INSTALL.CROSS' for details.

    - The file `src/base/ftmac.c' now contains code for Mac OS X only;
      its  deprecated function  `FT_GetFile_From_Mac_Font_Name' always
      returns an  error even if the QuickDraw  framework is available.
      The previous version has been moved to `builds/mac/ftmac.c'.

      Selecting  configure option `--with-quickdraw-carbon'  makes the
      build process use the original `ftmac.c' file instead of the Mac
      OS X-only version.


  IV. MISCELLANEOUS

    - Various performance and memory footprint optimizations have been
      performed on  the TrueType and CFF font  loaders, sometimes with
      very drastic  benefits (e.g., the  TrueType loader is  now about
      25% faster;  FreeType should use  less heap memory  under nearly
      all conditions).

    - The anti-aliased rasterizer has been optimized and is now 15% to
      25%  percent  faster than  in  previous  versions, depending  on
      content.

    - The Type 1 loader has been improved; as an example, it now skips
      top-level dictionaries properly.

    - Better support for Mac  fonts on POSIX systems, plus compilation
      fixes for Mac OS X on ppc64 where `ftmac.c' cannot be built.

    - Configuration  without `--with-old-mac-fonts'  does  not include
      `ftmac.c' (this was the behaviour in FreeType version 2.1.10).

    - The TrueTypeGX validator (gxvalid) checks the order of glyph IDs
      in the kern table.


======================================================================

CHANGES BETWEEN 2.2.1 and 2.2

  I. IMPORTANT BUG FIXES

    - Various integer overflows have been fixed.

    - PFB fonts with MacOS resource fork weren't  handled correctly on
      non-MacOS platforms.


======================================================================

CHANGES BETWEEN 2.2 and 2.1.10

(not released officially)

  I. IMPORTANT BUG FIXES

    - Vertical metrics for SFNT fonts were incorrect sometimes.

    - The FT_HAS_KERNING macro always returned 0.

    - CFF OpenType  fonts didn't  return correct vertical  metrics for
      glyphs with outlines.

    - If FreeType was compiled without hinters, all font formats based
      on PS outlines weren't scaled correctly.


  II. IMPORTANT CHANGES

    - Version 2.2 no longer exposes its internals, this is, the header
      files  located in  the `include/freetype/internal'  directory of
      the source package are not  copied anymore by the `make install'
      command.  Consequently, a number of rogue clients which directly
      access  FreeType's  internal   functions  and  structures  won't
      compile without modification.

      We provide  patches for  most of those  rogue clients.   See the
      following page for more information:

        https://www.freetype.org/freetype2/patches/rogue-patches.html

      Note that, as  a convenience to our Unix  desktop users, version
      2.2 is *binary* compatible wi