ftobjs.c

奇趣公司比较新的qt/emd版本

    flag_offset = offsets[face_index];
    error = FT_Stream_Seek( stream, flag_offset );
    if ( error )
      goto Exit;

    if ( FT_READ_LONG( rlen ) )
      goto Exit;
    if ( rlen == -1 )
      return FT_Err_Cannot_Open_Resource;

    if ( FT_ALLOC( sfnt_data, (FT_Long)rlen ) )
      return error;
    error = FT_Stream_Read( stream, (FT_Byte *)sfnt_data, rlen );
    if ( error )
      goto Exit;

    is_cff = rlen > 4 && sfnt_data[0] == 'O' &&
                         sfnt_data[1] == 'T' &&
                         sfnt_data[2] == 'T' &&
                         sfnt_data[3] == 'O';

    error = open_face_from_buffer( library,
                                   sfnt_data,
                                   rlen,
                                   face_index_in_resource,
                                   is_cff ? "cff" : "truetype",
                                   aface );

  Exit:
    return error;
  }


  /* Check for a valid resource fork header, or a valid dfont    */
  /* header.  In a resource fork the first 16 bytes are repeated */
  /* at the location specified by bytes 4-7.  In a dfont bytes   */
  /* 4-7 point to 16 bytes of zeroes instead.                    */
  /*                                                             */
  static FT_Error
  IsMacResource( FT_Library  library,
                 FT_Stream   stream,
                 FT_Long     resource_offset,
                 FT_Long     face_index,
                 FT_Face    *aface )
  {
    FT_Memory  memory = library->memory;
    FT_Error   error;
    FT_Long    map_offset, rdara_pos;
    FT_Long    *data_offsets;
    FT_Long    count;


    error = FT_Raccess_Get_HeaderInfo( library, stream, resource_offset,
                                       &map_offset, &rdara_pos );
    if ( error )
      return error;

    error = FT_Raccess_Get_DataOffsets( library, stream,
                                        map_offset, rdara_pos,
                                        FT_MAKE_TAG( 'P', 'O', 'S', 'T' ),
                                        &data_offsets, &count );
    if ( !error )
    {
      error = Mac_Read_POST_Resource( library, stream, data_offsets, count,
                                      face_index, aface );
      FT_FREE( data_offsets );
      /* POST exists in an LWFN providing a single face */
      if ( !error )
        (*aface)->num_faces = 1;
      return error;
    }

    error = FT_Raccess_Get_DataOffsets( library, stream,
                                        map_offset, rdara_pos,
                                        FT_MAKE_TAG( 's', 'f', 'n', 't' ),
                                        &data_offsets, &count );
    if ( !error )
    {
      FT_Long  face_index_internal = face_index % count;


      error = Mac_Read_sfnt_Resource( library, stream, data_offsets, count,
                                      face_index_internal, aface );
      FT_FREE( data_offsets );
      if ( !error )
        (*aface)->num_faces = count;
    }

    return error;
  }


  /* Check for a valid macbinary header, and if we find one   */
  /* check that the (flattened) resource fork in it is valid. */
  /*                                                          */
  static FT_Error
  IsMacBinary( FT_Library  library,
               FT_Stream   stream,
               FT_Long     face_index,
               FT_Face    *aface )
  {
    unsigned char  header[128];
    FT_Error       error;
    FT_Long        dlen, offset;


    error = FT_Stream_Seek( stream, 0 );
    if ( error )
      goto Exit;

    error = FT_Stream_Read( stream, (FT_Byte*)header, 128 );
    if ( error )
      goto Exit;

    if (            header[ 0] !=  0 ||
                    header[74] !=  0 ||
                    header[82] !=  0 ||
                    header[ 1] ==  0 ||
                    header[ 1] >  33 ||
                    header[63] !=  0 ||
         header[2 + header[1]] !=  0 )
      return FT_Err_Unknown_File_Format;

    dlen = ( header[0x53] << 24 ) |
           ( header[0x54] << 16 ) |
           ( header[0x55] <<  8 ) |
             header[0x56];
#if 0
    rlen = ( header[0x57] << 24 ) |
           ( header[0x58] << 16 ) |
           ( header[0x59] <<  8 ) |
             header[0x5a];
#endif /* 0 */
    offset = 128 + ( ( dlen + 127 ) & ~127 );

    return IsMacResource( library, stream, offset, face_index, aface );

  Exit:
    return error;
  }


  static FT_Error
  load_face_in_embedded_rfork( FT_Library           library,
                               FT_Stream            stream,
                               FT_Long              face_index,
                               FT_Face             *aface,
                               const FT_Open_Args  *args )
  {

#undef  FT_COMPONENT
#define FT_COMPONENT  trace_raccess

    FT_Memory  memory = library->memory;
    FT_Error   error  = FT_Err_Unknown_File_Format;
    int        i;

    char *     file_names[FT_RACCESS_N_RULES];
    FT_Long    offsets[FT_RACCESS_N_RULES];
    FT_Error   errors[FT_RACCESS_N_RULES];

    FT_Open_Args  args2;
    FT_Stream     stream2;


    FT_Raccess_Guess( library, stream,
                      args->pathname, file_names, offsets, errors );

    for ( i = 0; i < FT_RACCESS_N_RULES; i++ )
    {
      if ( errors[i] )
      {
        FT_TRACE3(( "Error[%d] has occurred in rule %d\n", errors[i], i ));
        continue;
      }

      args2.flags    = FT_OPEN_PATHNAME;
      args2.pathname = file_names[i] ? file_names[i] : args->pathname;

      FT_TRACE3(( "Try rule %d: %s (offset=%d) ...",
                  i, args2.pathname, offsets[i] ));

      error = FT_Stream_New( library, &args2, &stream2 );
      if ( error )
      {
        FT_TRACE3(( "failed\n" ));
        continue;
      }

      error = IsMacResource( library, stream2, offsets[i],
                             face_index, aface );
      FT_Stream_Free( stream2, 0 );

      FT_TRACE3(( "%s\n", error ? "failed": "successful" ));

      if ( !error )
          break;
    }

    for (i = 0; i < FT_RACCESS_N_RULES; i++)
    {
      if ( file_names[i] )
        FT_FREE( file_names[i] );
    }

    /* Caller (load_mac_face) requires FT_Err_Unknown_File_Format. */
    if ( error )
      error = FT_Err_Unknown_File_Format;

    return error;

#undef  FT_COMPONENT
#define FT_COMPONENT  trace_objs

  }


  /* Check for some macintosh formats.                             */
  /* Is this a macbinary file?  If so look at the resource fork.   */
  /* Is this a mac dfont file?                                     */
  /* Is this an old style resource fork? (in data)                 */
  /* Else call load_face_in_embedded_rfork to try extra rules      */
  /* (defined in `ftrfork.c').                                     */
  /*                                                               */
  static FT_Error
  load_mac_face( FT_Library           library,
                 FT_Stream            stream,
                 FT_Long              face_index,
                 FT_Face             *aface,
                 const FT_Open_Args  *args )
  {
    FT_Error error;
    FT_UNUSED( args );


    error = IsMacBinary( library, stream, face_index, aface );
    if ( FT_ERROR_BASE( error ) == FT_Err_Unknown_File_Format )
    {

#undef  FT_COMPONENT
#define FT_COMPONENT  trace_raccess

      FT_TRACE3(( "Try as dfont: %s ...", args->pathname ));

      error = IsMacResource( library, stream, 0, face_index, aface );

      FT_TRACE3(( "%s\n", error ? "failed" : "successful" ));

#undef  FT_COMPONENT
#define FT_COMPONENT  trace_objs

    }

    if ( ( FT_ERROR_BASE( error ) == FT_Err_Unknown_File_Format      ||
           FT_ERROR_BASE( error ) == FT_Err_Invalid_Stream_Operation ) &&
         ( args->flags & FT_OPEN_PATHNAME )                            )
      error = load_face_in_embedded_rfork( library, stream,
                                           face_index, aface, args );
    return error;
  }

#endif  /* !FT_MACINTOSH && FT_CONFIG_OPTION_MAC_FONTS */


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Open_Face( FT_Library           library,
                const FT_Open_Args*  args,
                FT_Long              face_index,
                FT_Face             *aface )
  {
    FT_Error     error;
    FT_Driver    driver;
    FT_Memory    memory;
    FT_Stream    stream;
    FT_Face      face = 0;
    FT_ListNode  node = 0;
    FT_Bool      external_stream;


    /* test for valid `library' delayed to */
    /* FT_Stream_New()                     */

    if ( ( !aface && face_index >= 0 ) || !args )
      return FT_Err_Invalid_Argument;

    external_stream = FT_BOOL( ( args->flags & FT_OPEN_STREAM ) &&
                               args->stream                     );

    /* create input stream */
    error = FT_Stream_New( library, args, &stream );
    if ( error )
      goto Exit;

    memory = library->memory;

    /* If the font driver is specified in the `args' structure, use */
    /* it.  Otherwise, we scan the list of registered drivers.      */
    if ( ( args->flags & FT_OPEN_DRIVER ) && args->driver )
    {
      driver = FT_DRIVER( args->driver );

      /* not all modules are drivers, so check... */
      if ( FT_MODULE_IS_DRIVER( driver ) )
      {
        FT_Int         num_params = 0;
        FT_Parameter*  params     = 0;


        if ( args->flags & FT_OPEN_PARAMS )
        {
          num_params = args->num_params;
          params     = args->params;
        }

        error = open_face( driver, stream, face_index,
                           num_params, params, &face );
        if ( !error )
          goto Success;
      }
      else
        error = FT_Err_Invalid_Handle;

      FT_Stream_Free( stream, external_stream );
      goto Fail;
    }
    else
    {
      /* check each font driver for an appropriate format */
      FT_Module*  cur   = library->modules;
      FT_Module*  limit = cur + library->num_modules;


      for ( ; cur < limit; cur++ )
      {
        /* not all modules are font drivers, so check... */
        if ( FT_MODULE_IS_DRIVER( cur[0] ) )
        {
          FT_Int         num_params = 0;
          FT_Parameter*  params     = 0;


          driver = FT_DRIVER( cur[0] );

          if ( args->flags & FT_OPEN_PARAMS )
          {
            num_params = args->num_params;
            params     = args->params;
          }

          error = open_face( driver, stream, face_index,
                             num_params, params, &face );
          if ( !error )
            goto Success;

          if ( FT_ERROR_BASE( error ) != FT_Err_Unknown_File_Format )
            goto Fail3;
        }
      }

  Fail3:
    /* If we are on the mac, and we get an FT_Err_Invalid_Stream_Operation */
    /* it may be because we have an empty data fork, so we need to check   */
    /* the resource fork.                                                  */
    if ( FT_ERROR_BASE( error ) != FT_Err_Unknown_File_Format      &&
         FT_ERROR_BASE( error ) != FT_Err_Invalid_Stream_Operation )
      goto Fail2;

#if !defined( FT_MACINTOSH ) && defined( FT_CONFIG_OPTION_MAC_FONTS )
    error = load_mac_face( library, stream, face_index, aface, args );
    if ( !error )
    {
      /* We don't want to go to Success here.  We've already done that. */
      /* On the other hand, if we succeeded we still need to close this */
      /* stream (we opened a different stream which extracted the       */
      /* interesting information out of this stream here.  That stream  */
      /* will still be open and the face will point to it).             */
      FT_Stream_Free( stream, external_stream );
      return error;
    }

    if ( FT_ERROR_BASE( error ) != FT_Err_Unknown_File_Format )
      goto Fail2;
#endif  /* !FT_MACINTOSH && FT_CONFIG_OPTION_MAC_FONTS */

      /* no driver is able to handle this format */
      error = FT_Err_Unknown_File_Format;

  Fail2:
      FT_Stream_Free( stream, external_stream );
      goto Fail;
    }

  Success:
    FT_TRACE4(( "FT_Open_Face: New face object, adding to list\n" ));

    /* set the FT_FACE_FLAG_EXTERNAL_STREAM bit for FT_Done_Face */
    if ( external_stream )
      face->face_flags |= FT_FACE_FLAG_EXTERNAL_STREAM;

    /* add the face object to its driver's list */
    if ( FT_NEW( node ) )
      goto Fail;

    node->data = face;
    /* don't assume driver is the same as face->driver, so use */
    /* face->driver instead.                                   */
    FT_List_Add( &face->driver->faces_list, node );

    /* now allocate a glyph slot object for the face */
    FT_TRACE4(( "FT_Open_Face: Creating glyph slot\n" ));

    if ( face_index >= 0 )
    {
      error = FT_New_GlyphSlot( face, NULL );
      if ( error )
        goto Fail;

      /* finally, allocate a size object for the face */
      {
        FT_Size  size;


        FT_TRACE4(( "FT_Open_Face: Creating size object\n" ));

        error = FT_New_Size( face, &size );
        if ( error )
          goto Fail;

        face->size = size;
      }
    }

    /* some checks */

    if ( FT_IS_SCALABLE( face ) )
    {
      if ( face->height < 0 )
        face->height = (FT_Short)-face->height;

      if ( !FT_HAS_VERTICAL( face ) )
        face->max_advance_height = (FT_Short)face->height;
    }

    if ( FT_HAS_FIXED_SIZES( face ) )
    {
      FT_Int  i;


      for ( i = 0; i < face->num_fixed_sizes; i++ )
      {
        FT_Bitmap_Size*  bsize = face->available_sizes + i;


        if ( bsize->height < 0 )
          bsize->height = (FT_Short)-bsize->height;
        if ( bsize->x_ppem < 0 )
          bsize->x_ppem = (FT_Short)-bsize->x_ppem;