ftobjs.c

一个类似windows

  /*    This function does some work for FT_Open_Face().                   */
  /*                                                                       */
  static FT_Error
  open_face( FT_Driver      driver,
             FT_Stream      stream,
             FT_Long        face_index,
             FT_Int         num_params,
             FT_Parameter*  params,
             FT_Face       *aface )
  {
    FT_Memory         memory;
    FT_Driver_Class   clazz;
    FT_Face           face = 0;
    FT_Error          error, error2;
    FT_Face_Internal  internal;


    clazz  = driver->clazz;
    memory = driver->root.memory;

    /* allocate the face object and perform basic initialization */
    if ( FT_ALLOC( face, clazz->face_object_size ) )
      goto Fail;

    if ( FT_NEW( internal ) )
      goto Fail;

    face->internal = internal;

    face->driver   = driver;
    face->memory   = memory;
    face->stream   = stream;

#ifdef FT_CONFIG_OPTION_INCREMENTAL
    {
      int  i;


      face->internal->incremental_interface = 0;
      for ( i = 0; i < num_params && !face->internal->incremental_interface;
            i++ )
        if ( params[i].tag == FT_PARAM_TAG_INCREMENTAL )
          face->internal->incremental_interface = params[i].data;
    }
#endif

    error = clazz->init_face( stream,
                              face,
                              (FT_Int)face_index,
                              num_params,
                              params );
    if ( error )
      goto Fail;

    /* select Unicode charmap by default */
    error2 = find_unicode_charmap( face );

    /* if no Unicode charmap can be found, FT_Err_Invalid_CharMap_Handle */
    /* is returned.                                                      */

    /* no error should happen, but we want to play safe */
    if ( error2 && error2 != FT_Err_Invalid_CharMap_Handle )
    {
      error = error2;
      goto Fail;
    }

    *aface = face;

  Fail:
    if ( error )
    {
      destroy_charmaps( face, memory );
      clazz->done_face( face );
      FT_FREE( internal );
      FT_FREE( face );
      *aface = 0;
    }

    return error;
  }


  /* there's a Mac-specific extended implementation of FT_New_Face() */
  /* in src/base/ftmac.c                                             */

#ifndef FT_MACINTOSH

  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Error )
  FT_New_Face( FT_Library   library,
               const char*  pathname,
               FT_Long      face_index,
               FT_Face     *aface )
  {
    FT_Open_Args  args;


    /* test for valid `library' and `aface' delayed to FT_Open_Face() */
    if ( !pathname )
      return FT_Err_Invalid_Argument;

    args.flags    = FT_OPEN_PATHNAME;
    args.pathname = (char*)pathname;

    return FT_Open_Face( library, &args, face_index, aface );
  }

#endif  /* !FT_MACINTOSH */


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Error )
  FT_New_Memory_Face( FT_Library      library,
                      const FT_Byte*  file_base,
                      FT_Long         file_size,
                      FT_Long         face_index,
                      FT_Face        *aface )
  {
    FT_Open_Args  args;


    /* test for valid `library' and `face' delayed to FT_Open_Face() */
    if ( !file_base )
      return FT_Err_Invalid_Argument;

    args.flags       = FT_OPEN_MEMORY;
    args.memory_base = file_base;
    args.memory_size = file_size;

    return FT_Open_Face( library, &args, face_index, aface );
  }


#if !defined( FT_MACINTOSH ) && defined( FT_CONFIG_OPTION_MAC_FONTS )

  /* The behavior here is very similar to that in base/ftmac.c, but it     */
  /* is designed to work on non-mac systems, so no mac specific calls.     */
  /*                                                                       */
  /* We look at the file and determine if it is a mac dfont file or a mac  */
  /* resource file, or a macbinary file containing a mac resource file.    */
  /*                                                                       */
  /* Unlike ftmac I'm not going to look at a `FOND'.  I don't really see   */
  /* the point, especially since there may be multiple `FOND' resources.   */
  /* Instead I'll just look for `sfnt' and `POST' resources, ordered as    */
  /* they occur in the file.                                               */
  /*                                                                       */
  /* Note that multiple `POST' resources do not mean multiple postscript   */
  /* fonts; they all get jammed together to make what is essentially a     */
  /* pfb file.                                                             */
  /*                                                                       */
  /* We aren't interested in `NFNT' or `FONT' bitmap resources.            */
  /*                                                                       */
  /* As soon as we get an `sfnt' load it into memory and pass it off to    */
  /* FT_Open_Face.                                                         */
  /*                                                                       */
  /* If we have a (set of) `POST' resources, massage them into a (memory)  */
  /* pfb file and pass that to FT_Open_Face.  (As with ftmac.c I'm not     */
  /* going to try to save the kerning info.  After all that lives in the   */
  /* `FOND' which isn't in the file containing the `POST' resources so     */
  /* we don't really have access to it.                                    */


  /* Finalizer for a memory stream; gets called by FT_Done_Face().
     It frees the memory it uses. */
  /* from ftmac.c */
  static void
  memory_stream_close( FT_Stream  stream )
  {
    FT_Memory  memory = stream->memory;


    FT_FREE( stream->base );

    stream->size  = 0;
    stream->base  = 0;
    stream->close = 0;
  }


  /* Create a new memory stream from a buffer and a size. */
  /* from ftmac.c */
  static FT_Error
  new_memory_stream( FT_Library           library,
                     FT_Byte*             base,
                     FT_ULong             size,
                     FT_Stream_CloseFunc  close,
                     FT_Stream           *astream )
  {
    FT_Error   error;
    FT_Memory  memory;
    FT_Stream  stream;


    if ( !library )
      return FT_Err_Invalid_Library_Handle;

    if ( !base )
      return FT_Err_Invalid_Argument;

    *astream = 0;
    memory = library->memory;
    if ( FT_NEW( stream ) )
      goto Exit;

    FT_Stream_OpenMemory( stream, base, size );

    stream->close = close;

    *astream = stream;

  Exit:
    return error;
  }


  /* Create a new FT_Face given a buffer and a driver name. */
  /* from ftmac.c */
  static FT_Error
  open_face_from_buffer( FT_Library   library,
                         FT_Byte*     base,
                         FT_ULong     size,
                         FT_Long      face_index,
                         const char*  driver_name,
                         FT_Face     *aface )
  {
    FT_Open_Args  args;
    FT_Error      error;
    FT_Stream     stream;
    FT_Memory     memory = library->memory;


    error = new_memory_stream( library,
                               base,
                               size,
                               memory_stream_close,
                               &stream );
    if ( error )
    {
      FT_FREE( base );
      return error;
    }

    args.flags = FT_OPEN_STREAM;
    args.stream = stream;
    if ( driver_name )
    {
      args.flags = args.flags | FT_OPEN_DRIVER;
      args.driver = FT_Get_Module( library, driver_name );
    }

    error = FT_Open_Face( library, &args, face_index, aface );

    if ( error == FT_Err_Ok )
      (*aface)->face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM;
    else
    {
      FT_Stream_Close( stream );
      FT_FREE( stream );
    }

    return error;
  }


  /* The resource header says we've got resource_cnt `POST' (type1) */
  /* resources in this file.  They all need to be coalesced into    */
  /* one lump which gets passed on to the type1 driver.             */
  /* Here can be only one PostScript font in a file so face_index   */
  /* must be 0 (or -1).                                             */
  /*                                                                */
  static FT_Error
  Mac_Read_POST_Resource( FT_Library  library,
                          FT_Stream   stream,
                          FT_Long    *offsets,
                          FT_Long     resource_cnt,
                          FT_Long     face_index,
                          FT_Face    *aface )
  {
    FT_Error   error  = FT_Err_Cannot_Open_Resource;
    FT_Memory  memory = library->memory;
    FT_Byte*   pfb_data;
    int        i, type, flags;
    FT_Long    len;
    FT_Long    pfb_len, pfb_pos, pfb_lenpos;
    FT_Long    rlen, temp;


    if ( face_index == -1 )
      face_index = 0;
    if ( face_index != 0 )
      return error;

    /* Find the length of all the POST resources, concatenated.  Assume */
    /* worst case (each resource in its own section).                   */
    pfb_len = 0;
    for ( i = 0; i < resource_cnt; ++i )
    {
      error = FT_Stream_Seek( stream, offsets[i] );
      if ( error )
        goto Exit;
      if ( FT_READ_LONG( temp ) )
        goto Exit;
      pfb_len += temp + 6;
    }

    if ( FT_ALLOC( pfb_data, (FT_Long)pfb_len + 2 ) )
      goto Exit;

    pfb_data[0] = 0x80;
    pfb_data[1] = 1;            /* Ascii section */
    pfb_data[2] = 0;            /* 4-byte length, fill in later */
    pfb_data[3] = 0;
    pfb_data[4] = 0;
    pfb_data[5] = 0;
    pfb_pos     = 7;
    pfb_lenpos  = 2;

    len = 0;
    type = 1;
    for ( i = 0; i < resource_cnt; ++i )
    {
      error = FT_Stream_Seek( stream, offsets[i] );
      if ( error )
        goto Exit2;
      if ( FT_READ_LONG( rlen ) )
        goto Exit;
      if ( FT_READ_USHORT( flags ) )
        goto Exit;
      rlen -= 2;                    /* the flags are part of the resource */
      if ( ( flags >> 8 ) == type )
        len += rlen;
      else
      {
        pfb_data[pfb_lenpos    ] = (FT_Byte)( len );
        pfb_data[pfb_lenpos + 1] = (FT_Byte)( len >> 8 );
        pfb_data[pfb_lenpos + 2] = (FT_Byte)( len >> 16 );
        pfb_data[pfb_lenpos + 3] = (FT_Byte)( len >> 24 );

        if ( ( flags >> 8 ) == 5 )      /* End of font mark */
          break;

        pfb_data[pfb_pos++] = 0x80;

        type = flags >> 8;
        len = rlen;

        pfb_data[pfb_pos++] = (FT_Byte)type;
        pfb_lenpos          = (FT_Byte)pfb_pos;
        pfb_data[pfb_pos++] = 0;        /* 4-byte length, fill in later */
        pfb_data[pfb_pos++] = 0;
        pfb_data[pfb_pos++] = 0;
        pfb_data[pfb_pos++] = 0;
      }

      error = FT_Stream_Read( stream, (FT_Byte *)pfb_data + pfb_pos, rlen );
      pfb_pos += rlen;
    }

    pfb_data[pfb_pos++] = 0x80;
    pfb_data[pfb_pos++] = 3;

    pfb_data[pfb_lenpos    ] = (FT_Byte)( len );
    pfb_data[pfb_lenpos + 1] = (FT_Byte)( len >> 8 );
    pfb_data[pfb_lenpos + 2] = (FT_Byte)( len >> 16 );
    pfb_data[pfb_lenpos + 3] = (FT_Byte)( len >> 24 );

    return open_face_from_buffer( library,
                                  pfb_data,
                                  pfb_pos,
                                  face_index,
                                  "type1",
                                  aface );

  Exit2:
    FT_FREE( pfb_data );

  Exit:
    return error;
  }


  /* The resource header says we've got resource_cnt `sfnt'      */
  /* (TrueType/OpenType) resources in this file.  Look through   */
  /* them for the one indicated by face_index, load it into mem, */
  /* pass it on the the truetype driver and return it.           */
  /*                                                             */
  static FT_Error
  Mac_Read_sfnt_Resource( FT_Library  library,
                          FT_Stream   stream,
                          FT_Long    *offsets,
                          FT_Long     resource_cnt,
                          FT_Long     face_index,
                          FT_Face    *aface )
  {
    FT_Memory  memory = library->memory;
    FT_Byte*   sfnt_data;
    FT_Error   error;
    FT_Long    flag_offset;
    FT_Long    rlen;
    int        is_cff;


    if ( face_index == -1 )
      face_index = 0;
    if ( face_index >= resource_cnt )
      return FT_Err_Cannot_Open_Resource;

    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,
                                   is_cff ? "cff" : "truetype",
                                   aface );

  Exit:
    return error;