changes

freetype:字库引擎,执行程序,用于安装 2.3.5

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:

      http://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'