changes

freetype:字库引擎,执行程序,用于安装 2.3.5

    - The CFF loader was modified to accept fonts which only contain a
      subset of  their reference charset.  This  prevented the correct
      use of PDF-embedded fonts.

    - The logic to detect Unicode charmaps has been modified.  This is
      required to  support fonts which include both  16-bit and 32-bit
      charmaps (like very  recent asian ones) using the  new 10 and 12
      SFNT formats.

    - The TrueType  loader now limits  the depth of  composite glyphs.
      This is necessary to prevent broken fonts to break the engine by
      blowing the stack with recursive glyph definitions.

    - The CMap cache is now  capable of managing UCS-4 character codes
      that   are   mapped   through   extended  charmaps   in   recent
      TrueType/OpenType fonts.

    - The   cache  sub-system   now  properly   manages  out-of-memory
      conditions  instead of  blindly  reporting them  to the  caller.
      This means that it will try to empty the cache before restarting
      its allocations to see if that can help.

    - The  PFR driver  didn't return  the list  of  available embedded
      bitmaps properly.

    - There was  a nasty  memory leak when  using embedded  bitmaps in
      certain font formats.


  II. IMPORTANT CHANGES

    - David Chester  contributed some enhancements  to the auto-hinter
      that  significantly increase  the  quality of  its output.   The
      Postscript hinter was also improved in several ways.

    - The FT_RENDER_MODE_LIGHT render mode was implemented.

    - A new  API function called `FT_Get_BDF_Property'  has been added
      to FT_BDF_H to  retrieve BDF properties from BDF  _and_ PCF font
      files.   THIS  IS  STILL  EXPERIMENTAL,  since  it  hasn't  been
      properly tested yet.

    - A Windows FNT specific API has been added, mostly to access font
      headers.  This is used by Wine.

    - TrueType tables  without an `hmtx' table are  now tolerated when
      an  incremental interface  is  used.  This  happens for  certain
      Type42 fonts passed from Ghostscript to FreeType.

    - The PFR font driver is  now capable of returning the font family
      and style  names when  they are available  (instead of  the sole
      `FontID').   This  is  performed  by parsing  an  *undocumented*
      portion of the font file!


  III. MISCELLANEOUS

    - The path stroker in FT_STROKER_H has entered beta stage.  It now
      works very  well, but  its interface might  change a bit  in the
      future.  More on this in later releases.

    - The documentation for  FT_Size_Metrics didn't appear properly in
      the API reference.

    - The file docs/VERSION.DLL has been updated to explain versioning
      with FreeType  (i.e., comparing release/libtool/so  numbers, and
      how to use them in autoconf scripts).

    - The  installation  documentation  has been  seriously  revamped.
      Everything is now in the `docs' directory.


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

CHANGES BETWEEN 2.1.3 and 2.1.2

  I. IMPORTANT BUG FIXES

    - FT_Vector_Transform  had  been  incorrectly modified  in  2.1.2,
      resulting  in  incorrect   transformations  being  applied  (for
      example, rotations were processed in opposite angles).

    - The format  8 and 12 TrueType charmap  enumeration routines have
      been fixed (FT_Get_Next_Char returned invalid values).

    - The  PFR font driver  returned incorrect  advance widths  if the
      outline  and metrics resolution  defined in  the font  file were
      different.

    - FT_Glyph_To_Bitmap now returns  successfully when called with an
      FT_BitmapGlyph argument (it previously returned an error).

    - A bug  in the Type 1  loader that prevented  valid font bounding
      boxes to be loaded from multiple master fonts.

    - The SFNT  validation code has been rewritten.   FreeType can now
      load `broken'  fonts that were  usable on Windows, but  not with
      previous versions of the library.

    - The computation of bearings in the BDF driver has been fixed.

    - The Postscript hinter crashed when trying to hint certain glyphs
      (more precisely,  when trying to  apply hints to an  empty glyph
      outline).

    - The  TrueType glyph  loader  now supports  composites in  `Apple
      format'  (they differ slightly  from Microsoft/OpenType  ones in
      the way transformation offsets are computed).

    - FreeType was  very slow at opening certain  asian CID/CFF fonts,
      due to  fixed increment  in dynamic array  re-allocations.  This
      has  been changed  to  exponential behaviour  to get  acceptable
      performance.



  II. IMPORTANT CHANGES

    - The PCF driver now supports gzip-compressed font files natively.
      This means that  you will be able to use  all these bitmap fonts
      that  come with  XFree86 with  FreeType (and  libXft/libXft2, by
      extension).

    - The  automatic and  postscript hinters  have both  been updated.
      This  results in  a relatively  important increase  of rendering
      quality since  many nasty defaults have been suppressed.  Please
      visit the web page:

        http://www.freetype.org/hinting/smooth-hinting.html

      for additional details on this topic.

    - The `load_flags' parameter of `FT_Load_Glyph' is now an FT_Int32
      (instead  of just  being  an FT_Int).   This  breaks source  and
      binary  compatibility for  16bit systems  only,  while retaining
      both of them for 32 and 64 bit ones.

      Some new flags have been added consequently:

        FT_LOAD_NO_AUTOHINT   :: Disable the use of the auto-hinter
                                 (but not native format hinters).

        FT_LOAD_TARGET_NORMAL :: Hint and render for normal
                                 anti-aliased displays.

        FT_LOAD_TARGET_MONO   :: Hint and render for 1-bit displays.

        FT_LOAD_TARGET_LCD    :: Hint and render for horizontal RGB or
                                 BGR sub-pixel displays (like LCD
                                 screens).  THIS IS STILL
                                 EXPERIMENTAL!

        FT_LOAD_TARGET_LCD_V  :: Same as FT_LOAD_TARGET_LCD, for
                                 vertical sub-pixel displays (like
                                 rotated LCD screens).  THIS IS STILL
                                 EXPERIMENTAL!

      FT_LOAD_MONOCHROME   is  still   supported,  but   only  affects
      rendering, not the hinting.

      Note that the `ftview'  demo program available in the `ft2demos'
      package  has been  updated to  support LCD-optimized  display on
      non-paletted displays (under Win32 and X11).

    - The  PFR  driver  now  supports embedded  bitmaps  (all  formats
      supported), and returns correct kerning metrics for all glyphs.

    - The TrueType charmap loader  now supports certain `broken' fonts
      that load under Windows without problems.

    - The cache API has been slightly modified (it's still a beta!):

       - The type  FTC_ImageDesc has been removed; it  is now replaced
         by  FTC_ImageTypeRec.   Note that  one  of  its  fields is  a
         `load_flag' parameter for FT_Load_Glyph.

       - The  field  `num_grays' of  FT_SBitRec  has  been changed  to
         `max_grays'  in  order to  fit  within  a  single byte.   Its
         maximum value is thus 255 (instead of 256 as previously).


  III. MISCELLANEOUS

    - Added support  for the  DESTDIR variable during  `make install'.
      This simplifies packaging of FreeType.

    - Included modified  copies of the  ZLib sources in  `src/gzip' in
      order to support  gzip-compressed PCF fonts.  We do  not use the
      system-provided  zlib  for  now,   though  this  is  a  probable
      enhancement for future releases.

    - The DocMaker tool used to generate the on-line API reference has
      been   completely    rewritten.    It   is    now   located   in
      `src/tools/docmaker/docmaker.py'.  Features:

        - better cross-referenced output
        - more polished output
        - uses Python regular expressions  (though it didn't speed the
          program)
        - much  more  modular structure,  which  allows for  different
          `backends'  in  order to  generate  HTML,  XML, or  whatever
          format.

      One can regenerate the API reference by calling:

         python src/tools/docmaker/docmaker.py \
                --prefix=ft2 \
                --title=FreeType-2.1.3 \
                --output=<outputdirectory>
                include/freetype/*.h \
                include/freetype/config/*.h \
                include/freetype/cache/*.h

    - A new, experimental, support for incremental font loading (i.e.,
      loading  of fonts  where the  glyphs are  not in  the  font file
      itself, but provided by an external component, like a Postscript
      interpreter) has been added by Graham Asher.  This is still work
      in progress, however.

    - A new,  EXPERIMENTAL, path stroker  has been added.   It doesn't
      suffer  from  severe  rounding  errors  and  treat  bezier  arcs
      directly.  Still work in progress (i.e. not part of the official
      API).   See  the file  <freetype/ftstroker.h>  for  some of  the
      details.

    - The massive  re-formatting of sources and  internal re-design is
      still under-way.  Many  internal functions, constants, and types
      have been renamed.


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

CHANGES BETWEEN 2.1.2 and 2.1.1

  I. IMPORTANT BUG FIXES

    - Many  font drivers didn't  select a  Unicode charmap  by default
      when a new face  was opened (with the FT_CONFIG_OPTION_USE_CMAPS
      options enabled),  causing many applications  to not be  able to
      display text correctly with the 2.1.x releases.

    - The  PFR driver had  a bug  in its  composite loading  code that
      produces incorrectly placed accents with many fonts.

    - The Type42 driver crashed sometimes due to a nasty bug.

    - The Type 1 custom encoding  charmap didn't handle the case where
      the first glyph index wasn't 0.

    - A  serious  typo  in  the  TrueType  composite  loader  produced
      incorrectly placed  glyphs in fonts  like `Wingdings' and  a few
      others.


  II. MISCELLANEOUS

    - The Win32  Visual C++ project  file has been updated  to include
      the PFR driver as well.

    - `freetype.m4' is  now installed by default by  `make install' on
      Unix systems.

    - The function  FT_Get_PS_Font_Info now works with  CID and Type42
      fonts as well.


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

CHANGES BETWEEN 2.1.1 and 2.1.0

  I. IMPORTANT BUG FIXES

    - The  `version_info'  returned   by  `freetype-config'  in  2.1.0
      returned an invalid value.  It now returns 9:1:3 (2.0.9 returned
      9:0:3).

    - Version 2.1.0  couldn't be linked against  applications on Win32
      and  Amiga systems  due  to  a new  debug  function that  wasn't
      properly   propagated  to   the  system-specific   directory  in
      `builds'.

    - Various MacOS and Mac OS X specific fixes.

    - Fixed  a bug in  the TrueType  charmap validation  routines that
      made version  2.1.0 too restrictive  -- many popular  fonts have
      been rejected.

    - There was  still a very small difference  between the monochrome
      glyph bitmaps produced by FreeType 1.x and FreeType 2.x with the
      bytecode  interpreter enabled.   This was  caused by  an invalid
      flag setting in the TrueType glyph loader, making the rasterizer
      change  its  drop-out   control  mode.   Now  the results should
      _really_ be completely identical.

    - The TrueType name table loader has been improved to support many
      popular  though buggy Asian  fonts.  It  now ignores  empty name
      entries,  invalid  pointer offsets  and  a  few other  incorrect
      subtleties.  Moreover,  name strings  are now loaded  on demand,
      which reduces the memory load  of many faces (e.g. the ARIAL.TTF
      font file contains a 10kByte name table with 70 names).

    - Fixed a bug in the Postscript hinter that prevented family blues
      substitution to happen correctly.


  II. NEW FEATURES

    - Three new font drivers in this release:

      * A  BDF  font driver,  contributed  by  Franco Zappa  Nardelli,
        heavily  modified   by  Werner  Lemberg.    It  also  supports
        anti-aliased bitmaps (using a slightly extended BDF format).

      * A Type42  font driver, contributed by Roberto  Alameda.  It is
        still experimental but seems to work relatively well.

      * A PFR  font driver, contributed  by David Turner  himself.  It
        doesn't  support PFR  hinting --  note that  BitStream  has at
        least two patents on this format!


  III. MISCELLANEOUS

    - The  cache  sub-system has  been  optimized  in important  ways.
      Cache hits are now significantly faster.  For example, using the
      CMap cache is about  twice faster than calling FT_Get_Char_Index
      on most platforms.  Similarly, using an SBit cache is about five
      times faster  than loading the  bitmaps from a bitmap  file, and
      300 to  500 times  faster than generating  them from  a scalable
      format.

      Note that  you should recompile  your sources if you  designed a
      custom  cache  class for  the  FT2  Cache  subsystem, since  the
      changes performed are source, but not binary, compatible.