changes

qt-x11-opensource-src-4.1.4.tar.gz源码

LATEST CHANGES BETWEEN 2.1.10 and 2.1.9

  I. IMPORTANT BUG FIXES

    - The size comparison for BDF and PCF files could fail sometimes.

    - Some  CFF files  were still not  loaded  correctly.   Patch from
      Derek Noonburg.

    - The stroker still had some serious bugs.

    - Boris  Letocha  fixed a  bug in  the  TrueType interpreter:  The
      NPUSHW instruction wasn't skipped correctly in IF clauses.  Some
      fonts like `Helvetica 75 Bold' failed.

    - Another  serious  bug  in  handling  TrueType hints  caused many
      distortions.  It has been introduced in version 2.1.8, and it is
      highly recommended to upgrade.

    - FreeType didn't properly parse empty Type 1 glyphs.
    
    - An unbound dynamic buffer growth was fixed in the PFR loader.
    
    - Several bugs have been fixed in the cache sub-system.

    - FreeType behaved incorrectly when resizing two distinct but very
      close character pixel sizes through `FT_Set_Char_Size' (Savannah
      bug #12263).
      
    - The auto-hinter didn't work properly for fonts without a Unicode
      charmap -- it even refused to load the glyphs.


  II. IMPORTANT CHANGES

    - Many fixes have been applied to drastically reduce the amount of
      heap   memory   used   by   FreeType,   especially   when  using
      memory-mapped font files  (which is the default on Unix  systems
      which support them).

    - The auto-hinter  has been replaced with a new module, called the
      `auto-fitter'.  It consumes  less memory  than its  predecessor,
      and it is  prepared to support non-latin scripts  better in next
      releases.

    - George Williams  contributed code to read  kerning data from PFM
      files.

    - FreeType   now   uses    the   TT_NAME_ID_PREFERRED_FAMILY   and
      TT_NAME_ID_PREFERRED_SUBFAMILY   strings   (if   available)  for
      setting  family  and  style in SFNT  fonts  (patch from Kornfeld
      Eliyahu Peter).

    - A  new  API `FT_Sfnt_Table_Info'  (in FT_TRUETYPE_TABLES_H)  has
      been added to retrieve name and size information of SFNT tables.

    - A new API `FT_OpenType_Validate' (in FT_OPENTYPE_VALIDATE_H) has
      been added to validate OpenType tables  (BASE, GDEF, GPOS, GSUB,
      JSTF).   After validation  it is  no longer  necessary to  check
      for errors in those tables while accessing them.

      Note that  this module might  be moved to another library in the
      future  to avoid  a tight  dependency between  FreeType and  the
      OpenType specification.

    - A new API in FT_BITMAP_H  (`FT_Bitmap_New', `FT_Bitmap_Convert',
      `FT_Bitmap_Copy',  `FT_Bitmap_Embolden',  `FT_Bitmap_Done')  has
      been added.   Its  use is  to convert an  FT_Bitmap structure in
      1bpp, 2bpp,  4bpp, or 8bpp  format into  another 8bpp FT_Bitmap,
      probably using a different pitch, and to further manipulate it.

    - A new  API `FT_Outline_Embolden'  (in FT_OUTLINE_H) gives  finer
      control how  outlines are embolded.

    - `FT_GlyphSlot_Embolden' (in FT_SYNTHESIS_H)  now handles bitmaps
      also (code contributed  by Chia I Wu).  Note that this  function
      is still experimental and may be replaced with a better API.

    - The method  how BDF and PCF  bitmap fonts  are accessed has been
      refined.   Formerly,   FT_Set_Pixel_Sizes  and  FT_Set_Char_Size
      were  synonyms in  FreeType's  BDF and PCF interface.  This  has
      changed now.  FT_Set_Pixel_Sizes  should be  used to  select the
      actual  font dimensions  (the `strike',  which is the sum of the
      `FONT_ASCENT'    and    `FONT_DESCENT'    properties),     while
      FT_Set_Char_Size  selects  the  `nominal' size  (the `PIXELSIZE'
      property).  In both functions, the width parameter is ignored.


  III. MISCELLANEOUS

    - The BDF driver  no longer converts  all returned bitmaps  with a
      depth of 2bpp or 4bpp to a depth of 8bpp.  The documentation has
      not  mentioned  this  explicitly,  but  implementors  might have
      relied on this after looking into the source files.

    - A new option `--ftversion' has been  added to freetype-config to
      return the FreeType version.

    - The  memory  debugger  has  been  updated   to  dump  allocation
      statistics on  all allocation  sources in the library.   This is
      useful to  spot greedy  allocations when  loading and processing
      fonts.

    - We removed a huge array of constant pointers to constant strings
      in the `psnames' module.   The problem was that  compilations in
      PIC mode (i.e.,  when generating a  Unix shared object/dll)  put
      the array  into the non-shared  writable section of  the library
      since absolute pointers are not relocatable by nature.
      
      This reduces the memory consumption by approximately 16KByte per
      process linked  to FreeType.   We now also store  the array in a
      compressed form (as a trie) which saves about 20KByte of code as
      well.

    - Kirill  Smelkov provided  patches to make  src/raster/ftraster.c
      compile stand-alone again.


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

LATEST CHANGES BETWEEN 2.1.9 and 2.1.8

  I. IMPORTANT BUG FIXES

    - The function  `FT_Get_CharMap_Index' was only declared,  without
      any  real  code.   For  consistency,  it  has  been  renamed  to
      `FT_Get_Charmap_Index'.   (This function is needed  to implement
      cmap caches.)

    - `FT_Outline_Get_BBox'  sometimes returned  incorrect values  for
      conic outlines (e.g., for TrueType fonts).

    - Handling of `bhed' table has been fixed.

    - The TrueType driver with enabled byte code interpreter sometimes
      returned artifacts due to incorrect rounding.  This bug has been
      introduced after version 2.1.4.

    - The BDF driver dropped the last glyph in the font.

    - The BDF driver now uses the DEFAULT_CHAR property (if available)
      to select a glyph shape for the undefined glyph.

    - The stroker failed for closed outlines and single points.


  II. IMPORTANT CHANGES

    - George  Williams   contributed  code  to   handle  Apple's  font
      distortion technology found in GX fonts (`avar', `cvar', `fvar',
      and `gvar' tables;  the Multiple Masters  API has been  slightly
      extended to cope with the new functionality).

    - The `FT_GlyphSlotRec' structure has been extended:  The elements
      `lsb_delta' and  `rsb_delta' give the difference  between hinted
      and  unhinted  left and right  side bearings  if autohinting  is
      active.  Using those values can improve the inter-letter spacing
      considerably.   See the documentation of  `FT_GlyphSlotRec'  and
      the `ftstring' demo program how to use it.

    - Loading TrueType and Type 1 fonts has been made much faster.

    - The stroker is  no longer experimental (but the  cache subsystem
      still is).


  III. MISCELLANEOUS

    - A new  documentation file  `formats.txt' describes various  font
      formats supported (and not supported) by FreeType.


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

LATEST CHANGES BETWEEN 2.1.8 and 2.1.7

  I. IMPORTANT BUG FIXES

    - The native  TrueType hinter contained some  bugs which prevented
      some fonts to be rendered correctly, most notably Legendum.otf.

    - The PostScript hinter now produces improved results.

    - The  linear advance  width  and height  values were  incorrectly
      rounded,  making  them virtually  unusable  if  not loaded  with
      FT_LOAD_LINEAR_DESIGN.

    - Indexing CID-keyed CFF fonts is  now working: The glyph index is
      correctly  treated as a  CID, similar  to FreeType's  CID driver
      module.  Note that CID CMap support is still missing.

    - The FT_FACE_FLAGS_GLYPH_NAMES flag is now  set correctly for all
      font formats.

    - Some subsetted Type 1  fonts weren't parsed correctly.  This bug
      has been introduced in 2.1.7.  In summary, the Type 1 parser has
      become more robust.

    - Non-decimal numbers weren't parsed correctly in PS fonts.

    - The WinFNT driver now correctly reports FT_ENCODING_NONE for all
      but one encoding.  Use  the new FT_WinFNT_ID_XXX values together
      with FT_Get_WinFNT_Header() to get the WinFNT charset ID.

    - The descender metrics (face->size->metrics.descender) for WinFNT
      bitmap fonts had the wrong sign.

    - The (emulated) `seac' support for CFF fonts was broken.

    - The `flex' operator didn't work for CFF fonts.

    - PS glyphs  which  use  the   `hintmask'  operator  haven't  been
      rendered correctly in some cases.

    - Metrics for BDF and PCF bitmap font formats have been fixed.

    - Autohinting  is now  disabled for  glyphs  which  are vertically
      distorted  or mirrored  (using a  transformation matrix).   This
      fixes a bug which produced zero-height glyphs.

    - The   `freetype-config'   script   now  handles   --prefix   and
      --exec-prefix correctly; it also  returns the proper --rpath (or
      -R) value if FreeType has been built as a shared library.


  II. IMPORTANT CHANGES

    - Both  PCF  and BDF  drivers  now  handle  the SETWIDTH_NAME  and
      ADD_STYLE_NAME    properties.     Values    are   appended    to
      face->style_name; example: `Bold SemiCondensed'.

    - The PCF driver now handles bitmap  fonts compressed with the LZW
      algorithm (extension .pcf.Z, compressed with `compress').

    - A  new  API   function  `FT_Get_CMap_Language_ID'  (declared  in
      `tttables.h')  is  available  to   get  the  language  ID  of  a
      TrueType/SFNT cmap.

    - The hexadecimal format of  data after the `StartData' command in
      CID-keyed Type 1 fonts is now supported.  While this can't occur
      in  file-based   fonts,  it  can   happen  in  document-embedded
      resources of PostScript documents.

    - Embedded bitmaps in SFNT-based CFF fonts are now supported.

    - A simple  API is  now available  to control  FreeType's  tracing
      mechanism if compiled  with FT_DEBUG_LEVEL_TRACE.   See the file
      `ftdebug.h' for more details.

    - YAMATO Masatake contributed improved  handling of MacOS resource
      forks on non-MacOS platforms (for example, Linux can mount MacOS
      file systems).

    - Support for MacOS has been improved; there is now a new function
      `FT_New_Face_From_FSSpec'  similar to `FT_New_Face'  except that
      it accepts an FSSpec instead of a path.

    - The cache sub-system has been rewritten.

      - There is now support for deinstallation of faces.

      - A new  API function `FTC_Manager_RemoveFaceID'  has been added
        to  delete  all  `idle'  nodes  that  correspond  to  a  given
        FTC_FaceID.  All `locked' nodes  (i.e., those with a reference
        count > 0), will be modified to prevent them from appearing in
        further  lookups (they  will  be cleaned  normally when  their
        reference count reaches 0).

      - There  is  now  support  for point  scaling  (i.e.,  providing
        character sizes in points + dpis, instead of pixels).

      - Three abstract cache classes are now available:

          FTC_GCache:  Used to store  one glyph  item per  cache node,
                      with the ability to group common attributes into
                      `families'.      This    replaces     the    old
                      FTC_GlyphCache class.

          FTC_ICache: Used to store one FT_Glyph per cache node.  This
                      extends  FTC_GCache.  Family  definition, family
                      comparison, and  glyph loading are  however left
                      to sub-classes.

          FTC_SCache: Used to  store up to 16 small  bitmaps per cache
                      node.    This    extends   FTC_GCache.    Family
                      definition, family  comparison and glyph loading
                      are however left to sub-classes.

      - The file `src/cache/ftcbasic.c' implements:

          FTC_ImageCache: Extends    FTC_ICache;   implements   family
                          definitions and glyph loading similar to the
                          old API.

          FTC_SBitCache: Extends    FTC_SCache,    implements   family
                         definitions and glyph  loading similar to the
                         old API

        Client  applications  should  be  able to  extend  FTC_GCache,
        FTC_ICache, or FTC_SCache much more easily (i.e., less code to
        write, and  less callbacks).  For example,  one could envision
        caches  that are  capable of  storing  transformed (obliqued),
        stroked,   emboldened,   or   colored   glyph   images.    Use
        `ftcbasic.c' as an example.