changes

来自「奇趣公司比较新的qt/emd版本」· 代码 · 共 1,661 行 · 第 1/5 页

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 intepreter 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 0 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'
      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:

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

      Note that, as  a convenience to our Unix  desktop users, version
      2.2 is *binary* compatible with FreeType 2.1.7, which means that
      installing this  release on  an existing distribution  shall not
      break any working desktop.

    - FreeType's build  mechanism has been redesigned.   With GNU make
      it  is  now  sufficient  in   most  cases  to  edit  two  files:
      `modules.cfg',  to  select   the  library  components,  and  the
      configuration  file  `include/freetype/config/ftoption.h' (which
      can be copied to the objects directory).  Removing unused module
      directories   to    prevent   its   compilation    and   editing
      `include/freetype/config/ftmodule.h' is no longer necessary.

    - The  LIGHT  hinting algorithm  produces  more pleasant  results.
      Also, using the  FT_LOAD_TARGET_LIGHT flags within FT_Load_Glyph
      always forces auto-hinting, as a special exception.  This allows
      you to experiment with it  even if you have enabled the TrueType
      bytecode interpreter in your build.

    - The auto hinter now employs a new algorithm for CJK fonts, based
      on Akito  Hirai's patch.   Note that this  only works  for fonts
      with a Unicode charmap at the moment.

    - The following callback function  types have changed slightly (by
      adding the `const' keyword where appropriate):

        FT_Outline_MoveToFunc
        FT_Outline_LineToFunc
        FT_Outline_ConicToFunc
        FT_Outline_CubicToFunc
        FT_SpanFunc
        FT_Raster_RenderFunc

        FT_Glyph_TransformFunc
        FT_Renderer_RenderFunc
        FT_Renderer_TransformFunc

      Note that this doesn't affect binary backward compatibility.

    - On MacOS,  new APIs have  been added as replacements  for legacy
      APIs:  `FT_New_Face_From_FSRef'  for  `FT_New_Face_From_FSSpec',
      and              `FT_GetFile_From_Mac_ATS_Name'              for
      `FT_GetFile_From_Mac_Name'.  Legacy APIs are still available, if
      FreeType is built without disabling them.