ttpost.c

奇趣公司比较新的qt/emd版本

    }

  Fail:
    FT_FREE( name_strings );
    FT_FREE( glyph_indices );

  Exit:
    return error;
  }


  static FT_Error
  load_format_25( TT_Face    face,
                  FT_Stream  stream )
  {
    FT_Memory  memory = stream->memory;
    FT_Error   error;

    FT_Int     num_glyphs;
    FT_Char*   offset_table = 0;


    /* UNDOCUMENTED!  This value appears only in the Apple TT specs. */
    if ( FT_READ_USHORT( num_glyphs ) )
      goto Exit;

    /* check the number of glyphs */
    if ( num_glyphs > face->max_profile.numGlyphs || num_glyphs > 258 )
    {
      error = SFNT_Err_Invalid_File_Format;
      goto Exit;
    }

    if ( FT_NEW_ARRAY( offset_table, num_glyphs )   ||
         FT_STREAM_READ( offset_table, num_glyphs ) )
      goto Fail;

    /* now check the offset table */
    {
      FT_Int  n;


      for ( n = 0; n < num_glyphs; n++ )
      {
        FT_Long  idx = (FT_Long)n + offset_table[n];


        if ( idx < 0 || idx > num_glyphs )
        {
          error = SFNT_Err_Invalid_File_Format;
          goto Fail;
        }
      }
    }

    /* OK, set table fields and exit successfully */
    {
      TT_Post_25  table = &face->postscript_names.names.format_25;


      table->num_glyphs = (FT_UShort)num_glyphs;
      table->offsets    = offset_table;
    }

    return SFNT_Err_Ok;

  Fail:
    FT_FREE( offset_table );

  Exit:
    return error;
  }


  static FT_Error
  load_post_names( TT_Face  face )
  {
    FT_Stream  stream;
    FT_Error   error;
    FT_Fixed   format;


    /* get a stream for the face's resource */
    stream = face->root.stream;

    /* seek to the beginning of the PS names table */
    error = face->goto_table( face, TTAG_post, stream, 0 );
    if ( error )
      goto Exit;

    format = face->postscript.FormatType;

    /* go to beginning of subtable */
    if ( FT_STREAM_SKIP( 32 ) )
      goto Exit;

    /* now read postscript table */
    if ( format == 0x00020000L )
      error = load_format_20( face, stream );
    else if ( format == 0x00028000L )
      error = load_format_25( face, stream );
    else
      error = SFNT_Err_Invalid_File_Format;

    face->postscript_names.loaded = 1;

  Exit:
    return error;
  }


  FT_LOCAL_DEF( void )
  tt_face_free_ps_names( TT_Face  face )
  {
    FT_Memory      memory = face->root.memory;
    TT_Post_Names  names  = &face->postscript_names;
    FT_Fixed       format;


    if ( names->loaded )
    {
      format = face->postscript.FormatType;

      if ( format == 0x00020000L )
      {
        TT_Post_20  table = &names->names.format_20;
        FT_UShort   n;


        FT_FREE( table->glyph_indices );
        table->num_glyphs = 0;

        for ( n = 0; n < table->num_names; n++ )
          FT_FREE( table->glyph_names[n] );

        FT_FREE( table->glyph_names );
        table->num_names = 0;
      }
      else if ( format == 0x00028000L )
      {
        TT_Post_25  table = &names->names.format_25;


        FT_FREE( table->offsets );
        table->num_glyphs = 0;
      }
    }
    names->loaded = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    tt_face_get_ps_name                                                */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Gets the PostScript glyph name of a glyph.                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the parent face.                             */
  /*                                                                       */
  /*    idx    :: The glyph index.                                         */
  /*                                                                       */
  /*    PSname :: The address of a string pointer.  Will be NULL in case   */
  /*              of error, otherwise it is a pointer to the glyph name.   */
  /*                                                                       */
  /*              You must not modify the returned string!                 */
  /*                                                                       */
  /* <Output>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  tt_face_get_ps_name( TT_Face      face,
                       FT_UInt      idx,
                       FT_String**  PSname )
  {
    FT_Error         error;
    TT_Post_Names    names;
    FT_Fixed         format;

#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
    FT_Service_PsCMaps  psnames;
#endif


    if ( !face )
      return SFNT_Err_Invalid_Face_Handle;

    if ( idx >= (FT_UInt)face->max_profile.numGlyphs )
      return SFNT_Err_Invalid_Glyph_Index;

#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
    psnames = (FT_Service_PsCMaps)face->psnames;
    if ( !psnames )
      return SFNT_Err_Unimplemented_Feature;
#endif

    names = &face->postscript_names;

    /* `.notdef' by default */
    *PSname = MAC_NAME( 0 );

    format = face->postscript.FormatType;

    if ( format == 0x00010000L )
    {
      if ( idx < 258 )                    /* paranoid checking */
        *PSname = MAC_NAME( idx );
    }
    else if ( format == 0x00020000L )
    {
      TT_Post_20  table = &names->names.format_20;


      if ( !names->loaded )
      {
        error = load_post_names( face );
        if ( error )
          goto End;
      }

      if ( idx < (FT_UInt)table->num_glyphs )
      {
        FT_UShort  name_index = table->glyph_indices[idx];


        if ( name_index < 258 )
          *PSname = MAC_NAME( name_index );
        else
          *PSname = (FT_String*)table->glyph_names[name_index - 258];
      }
    }
    else if ( format == 0x00028000L )
    {
      TT_Post_25  table = &names->names.format_25;


      if ( !names->loaded )
      {
        error = load_post_names( face );
        if ( error )
          goto End;
      }

      if ( idx < (FT_UInt)table->num_glyphs )    /* paranoid checking */
      {
        idx    += table->offsets[idx];
        *PSname = MAC_NAME( idx );
      }
    }

    /* nothing to do for format == 0x00030000L */

  End:
    return SFNT_Err_Ok;
  }


/* END */