[ft-devel] FreeType 2.3.0 release candidate 1 is available

[David Turner]

Hello everyone,

just to inform you that FreeType 2.3.0rc1 is now available at
the following web addresses:

  http://david.freetype.org/freetype/freetype-2.3.0rc1.tar.gz
  http://david.freetype.org/freetype/freetype-2.3.0rc1.tar.bz2
  http://david.freetype.org/freetype/ft230rc1.zip

you can also grab it from the CVS using the VER-2-3-0-RC1 tag

as the name suggest, this is a release candidate, not the final
package. We now need to build and install it on many systems to
check that everything works fine.

The minor version number was increased due to what I believe
are numerous improvements in auto-hinting, performance, memory
usage, as well as new features like automatic support for
unpatented hinting, LCD color filtering and a few more things.

There should be *no* break of ABI or API since the last two
releases (2.2.1 and 2.1.10), if you detect a severe problem
when installing this version, that's clearly a bug that should
be reported on this mailing list.

Building/Installation volunteers are welcomed. I'm especially
curious about warning messages happening during compilations on
exotic platforms, since we try to *completely* prevent them in
our official releases.


Regards and enjoy,

- David Turner
- The FreeType Project  (www.freetype.org)

================copy of docs/CHANGES============================
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).


  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 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.


  III. 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.

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

    - Better support for Mac  Fonts on POSIX systems, plus compilation
      fixes for PPC64.


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