sfobjs.h File Reference

#include <ft2build.h>

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Functions
FT_BEGIN_HEADER	sfnt_init_face (FT_Stream stream, TT_Face face, FT_Int face_instance_index, FT_Int num_params, FT_Parameter *params)
	sfnt_load_face (FT_Stream stream, TT_Face face, FT_Int face_instance_index, FT_Int num_params, FT_Parameter *params)
	sfnt_done_face (TT_Face face)
	tt_face_get_name (TT_Face face, FT_UShort nameid, FT_String **name)

Function Documentation

sfnt_done_face()

sfnt_done_face

(

TT_Face

face

)

Definition at line 1710 of file sfobjs.c.

  {
    FT_Memory     memory;
    SFNT_Service  sfnt;
 
 
    if ( !face )
      return;
 
    memory = face->root.memory;
    sfnt   = (SFNT_Service)face->sfnt;
 
    if ( sfnt )
    {
      /* destroy the postscript names table if it is loaded */
      if ( sfnt->free_psnames )
        sfnt->free_psnames( face );
 
      /* destroy the embedded bitmaps table if it is loaded */
      if ( sfnt->free_eblc )
        sfnt->free_eblc( face );
    }
 
#ifdef TT_CONFIG_OPTION_BDF
    /* freeing the embedded BDF properties */
    tt_face_free_bdf_props( face );
#endif
 
    /* freeing the kerning table */
    tt_face_done_kern( face );
 
    /* freeing the collection table */
    FT_FREE( face->ttc_header.offsets );
    face->ttc_header.count = 0;
 
    /* freeing table directory */
    FT_FREE( face->dir_tables );
    face->num_tables = 0;
 
    {
      FT_Stream  stream = FT_FACE_STREAM( face );
 
 
      /* simply release the 'cmap' table frame */
      FT_FRAME_RELEASE( face->cmap_table );
      face->cmap_size = 0;
    }
 
    face->horz_metrics_size = 0;
    face->vert_metrics_size = 0;
 
    /* freeing vertical metrics, if any */
    if ( face->vertical_info )
    {
      FT_FREE( face->vertical.long_metrics  );
      FT_FREE( face->vertical.short_metrics );
      face->vertical_info = 0;
    }
 
    /* freeing the gasp table */
    FT_FREE( face->gasp.gaspRanges );
    face->gasp.numRanges = 0;
 
    /* freeing the name table */
    if ( sfnt )
      sfnt->free_name( face );
 
    /* freeing family and style name */
    FT_FREE( face->root.family_name );
    FT_FREE( face->root.style_name );
 
    /* freeing sbit size table */
    FT_FREE( face->root.available_sizes );
    FT_FREE( face->sbit_strike_map );
    face->root.num_fixed_sizes = 0;
 
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
    FT_FREE( face->postscript_name );
    FT_FREE( face->var_postscript_prefix );
#endif
 
    face->sfnt = NULL;
  }

sfnt_init_face()

FT_BEGIN_HEADER sfnt_init_face	(	FT_Stream	stream,
		TT_Face	face,
		FT_Int	face_instance_index,
		FT_Int	num_params,
		FT_Parameter *	params
	)

Definition at line 854 of file sfobjs.c.

  {
    FT_Error      error;
    FT_Library    library = face->root.driver->root.library;
    SFNT_Service  sfnt;
    FT_Int        face_index;
 
 
    /* for now, parameters are unused */
    FT_UNUSED( num_params );
    FT_UNUSED( params );
 
 
    sfnt = (SFNT_Service)face->sfnt;
    if ( !sfnt )
    {
      sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
      if ( !sfnt )
      {
        FT_ERROR(( "sfnt_init_face: cannot access `sfnt' module\n" ));
        return FT_THROW( Missing_Module );
      }
 
      face->sfnt       = sfnt;
      face->goto_table = sfnt->goto_table;
    }
 
    FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS );
 
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
    if ( !face->mm )
    {
      /* we want the MM interface from the `truetype' module only */
      FT_Module  tt_module = FT_Get_Module( library, "truetype" );
 
 
      face->mm = ft_module_get_service( tt_module,
                                        FT_SERVICE_ID_MULTI_MASTERS,
                                        0 );
    }
 
    if ( !face->var )
    {
      /* we want the metrics variations interface */
      /* from the `truetype' module only          */
      FT_Module  tt_module = FT_Get_Module( library, "truetype" );
 
 
      face->var = ft_module_get_service( tt_module,
                                         FT_SERVICE_ID_METRICS_VARIATIONS,
                                         0 );
    }
#endif
 
    FT_TRACE2(( "SFNT driver\n" ));
 
    error = sfnt_open_font( stream, face );
    if ( error )
      return error;
 
    /* Stream may have changed in sfnt_open_font. */
    stream = face->root.stream;
 
    FT_TRACE2(( "sfnt_init_face: %08p, %d\n", face, face_instance_index ));
 
    face_index = FT_ABS( face_instance_index ) & 0xFFFF;
 
    /* value -(N+1) requests information on index N */
    if ( face_instance_index < 0 )
      face_index--;
 
    if ( face_index >= face->ttc_header.count )
    {
      if ( face_instance_index >= 0 )
        return FT_THROW( Invalid_Argument );
      else
        face_index = 0;
    }
 
    if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) )
      return error;
 
    /* check whether we have a valid TrueType file */
    error = sfnt->load_font_dir( face, stream );
    if ( error )
      return error;
 
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
    {
      FT_Memory  memory = face->root.memory;
 
      FT_ULong  fvar_len;
 
      FT_ULong  version;
      FT_ULong  offset;
 
      FT_UShort  num_axes;
      FT_UShort  axis_size;
      FT_UShort  num_instances;
      FT_UShort  instance_size;
 
      FT_Int  instance_index;
 
      FT_Byte*  default_values  = NULL;
      FT_Byte*  instance_values = NULL;
 
 
      instance_index = FT_ABS( face_instance_index ) >> 16;
 
      /* test whether current face is a GX font with named instances */
      if ( face->goto_table( face, TTAG_fvar, stream, &fvar_len ) ||
           fvar_len < 20                                          ||
           FT_READ_ULONG( version )                               ||
           FT_READ_USHORT( offset )                               ||
           FT_STREAM_SKIP( 2 ) /* reserved */                     ||
           FT_READ_USHORT( num_axes )                             ||
           FT_READ_USHORT( axis_size )                            ||
           FT_READ_USHORT( num_instances )                        ||
           FT_READ_USHORT( instance_size )                        )
      {
        version       = 0;
        offset        = 0;
        num_axes      = 0;
        axis_size     = 0;
        num_instances = 0;
        instance_size = 0;
      }
 
      /* check that the data is bound by the table length */
      if ( version != 0x00010000UL                    ||
           axis_size != 20                            ||
           num_axes == 0                              ||
           /* `num_axes' limit implied by 16-bit `instance_size' */
           num_axes > 0x3FFE                          ||
           !( instance_size == 4 + 4 * num_axes ||
              instance_size == 6 + 4 * num_axes )     ||
           /* `num_instances' limit implied by limited range of name IDs */
           num_instances > 0x7EFF                     ||
           offset                          +
             axis_size * num_axes          +
             instance_size * num_instances > fvar_len )
        num_instances = 0;
      else
        face->variation_support |= TT_FACE_FLAG_VAR_FVAR;
 
      /*
       *  As documented in the OpenType specification, an entry for the
       *  default instance may be omitted in the named instance table.  In
       *  particular this means that even if there is no named instance
       *  table in the font we actually do have a named instance, namely the
       *  default instance.
       *
       *  For consistency, we always want the default instance in our list
       *  of named instances.  If it is missing, we try to synthesize it
       *  later on.  Here, we have to adjust `num_instances' accordingly.
       */
 
      if ( ( face->variation_support & TT_FACE_FLAG_VAR_FVAR ) &&
           !( FT_ALLOC( default_values, num_axes * 4 )  ||
              FT_ALLOC( instance_values, num_axes * 4 ) )      )
      {
        /* the current stream position is 16 bytes after the table start */
        FT_ULong  array_start = FT_STREAM_POS() - 16 + offset;
        FT_ULong  default_value_offset, instance_offset;
 
        FT_Byte*  p;
        FT_UInt   i;
 
 
        default_value_offset = array_start + 8;
        p                    = default_values;
 
        for ( i = 0; i < num_axes; i++ )
        {
          (void)FT_STREAM_READ_AT( default_value_offset, p, 4 );
 
          default_value_offset += axis_size;
          p                    += 4;
        }
 
        instance_offset = array_start + axis_size * num_axes + 4;
 
        for ( i = 0; i < num_instances; i++ )
        {
          (void)FT_STREAM_READ_AT( instance_offset,
                                   instance_values,
                                   num_axes * 4 );
 
          if ( !ft_memcmp( default_values, instance_values, num_axes * 4 ) )
            break;
 
          instance_offset += instance_size;
        }
 
        if ( i == num_instances )
        {
          /* no default instance in named instance table; */
          /* we thus have to synthesize it                */
          num_instances++;
        }
      }
 
      FT_FREE( default_values );
      FT_FREE( instance_values );
 
      /* we don't support Multiple Master CFFs yet; */
      /* note that `glyf' or `CFF2' have precedence */
      if ( face->goto_table( face, TTAG_glyf, stream, 0 ) &&
           face->goto_table( face, TTAG_CFF2, stream, 0 ) &&
           !face->goto_table( face, TTAG_CFF, stream, 0 ) )
        num_instances = 0;
 
      /* instance indices in `face_instance_index' start with index 1, */
      /* thus `>' and not `>='                                         */
      if ( instance_index > num_instances )
      {
        if ( face_instance_index >= 0 )
          return FT_THROW( Invalid_Argument );
        else
          num_instances = 0;
      }
 
      face->root.style_flags = (FT_Long)num_instances << 16;
    }
#endif
 
    face->root.num_faces  = face->ttc_header.count;
    face->root.face_index = face_instance_index;
 
    return error;
  }

sfnt_load_face()

sfnt_load_face	(	FT_Stream	stream,
		TT_Face	face,
		FT_Int	face_instance_index,
		FT_Int	num_params,
		FT_Parameter *	params
	)

Definition at line 1134 of file sfobjs.c.

  {
    FT_Error      error;
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
    FT_Error      psnames_error;
#endif
    FT_Bool       has_outline;
    FT_Bool       is_apple_sbit;
    FT_Bool       is_apple_sbix;
    FT_Bool       ignore_typographic_family    = FALSE;
    FT_Bool       ignore_typographic_subfamily = FALSE;
 
    SFNT_Service  sfnt = (SFNT_Service)face->sfnt;
 
    FT_UNUSED( face_instance_index );
 
 
    /* Check parameters */
 
    {
      FT_Int  i;
 
 
      for ( i = 0; i < num_params; i++ )
      {
        if ( params[i].tag == FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY )
          ignore_typographic_family = TRUE;
        else if ( params[i].tag == FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY )
          ignore_typographic_subfamily = TRUE;
      }
    }
 
    /* Load tables */
 
    /* We now support two SFNT-based bitmapped font formats.  They */
    /* are recognized easily as they do not include a `glyf'       */
    /* table.                                                      */
    /*                                                             */
    /* The first format comes from Apple, and uses a table named   */
    /* `bhed' instead of `head' to store the font header (using    */
    /* the same format).  It also doesn't include horizontal and   */
    /* vertical metrics tables (i.e. `hhea' and `vhea' tables are  */
    /* missing).                                                   */
    /*                                                             */
    /* The other format comes from Microsoft, and is used with     */
    /* WinCE/PocketPC.  It looks like a standard TTF, except that  */
    /* it doesn't contain outlines.                                */
    /*                                                             */
 
    FT_TRACE2(( "sfnt_load_face: %08p\n\n", face ));
 
    /* do we have outlines in there? */
#ifdef FT_CONFIG_OPTION_INCREMENTAL
    has_outline = FT_BOOL( face->root.internal->incremental_interface ||
                           tt_face_lookup_table( face, TTAG_glyf )    ||
                           tt_face_lookup_table( face, TTAG_CFF )     ||
                           tt_face_lookup_table( face, TTAG_CFF2 )    );
#else
    has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) ||
                           tt_face_lookup_table( face, TTAG_CFF )  ||
                           tt_face_lookup_table( face, TTAG_CFF2 ) );
#endif
 
    is_apple_sbit = 0;
    is_apple_sbix = !face->goto_table( face, TTAG_sbix, stream, 0 );
 
    /* Apple 'sbix' color bitmaps are rendered scaled and then the 'glyf'
     * outline rendered on top.  We don't support that yet, so just ignore
     * the 'glyf' outline and advertise it as a bitmap-only font. */
    if ( is_apple_sbix )
      has_outline = FALSE;
 
    /* if this font doesn't contain outlines, we try to load */
    /* a `bhed' table                                        */
    if ( !has_outline && sfnt->load_bhed )
    {
      LOAD_( bhed );
      is_apple_sbit = FT_BOOL( !error );
    }
 
    /* load the font header (`head' table) if this isn't an Apple */
    /* sbit font file                                             */
    if ( !is_apple_sbit || is_apple_sbix )
    {
      LOAD_( head );
      if ( error )
        goto Exit;
    }
 
    /* OpenType 1.8.2 introduced limits to this value;    */
    /* however, they make sense for older SFNT fonts also */
    if ( face->header.Units_Per_EM <    16 ||
         face->header.Units_Per_EM > 16384 )
    {
      error = FT_THROW( Invalid_Table );
 
      goto Exit;
    }
 
    /* the following tables are often not present in embedded TrueType */
    /* fonts within PDF documents, so don't check for them.            */
    LOAD_( maxp );
    LOAD_( cmap );
 
    /* the following tables are optional in PCL fonts -- */
    /* don't check for errors                            */
    LOAD_( name );
    LOAD_( post );
 
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
    psnames_error = error;
#endif
 
    /* do not load the metrics headers and tables if this is an Apple */
    /* sbit font file                                                 */
    if ( !is_apple_sbit )
    {
      /* load the `hhea' and `hmtx' tables */
      LOADM_( hhea, 0 );
      if ( !error )
      {
        LOADM_( hmtx, 0 );
        if ( FT_ERR_EQ( error, Table_Missing ) )
        {
          error = FT_THROW( Hmtx_Table_Missing );
 
#ifdef FT_CONFIG_OPTION_INCREMENTAL
          /* If this is an incrementally loaded font and there are */
          /* overriding metrics, tolerate a missing `hmtx' table.  */
          if ( face->root.internal->incremental_interface          &&
               face->root.internal->incremental_interface->funcs->
                 get_glyph_metrics                                 )
          {
            face->horizontal.number_Of_HMetrics = 0;
            error                               = FT_Err_Ok;
          }
#endif
        }
      }
      else if ( FT_ERR_EQ( error, Table_Missing ) )
      {
        /* No `hhea' table necessary for SFNT Mac fonts. */
        if ( face->format_tag == TTAG_true )
        {
          FT_TRACE2(( "This is an SFNT Mac font.\n" ));
 
          has_outline = 0;
          error       = FT_Err_Ok;
        }
        else
        {
          error = FT_THROW( Horiz_Header_Missing );
 
#ifdef FT_CONFIG_OPTION_INCREMENTAL
          /* If this is an incrementally loaded font and there are */
          /* overriding metrics, tolerate a missing `hhea' table.  */
          if ( face->root.internal->incremental_interface          &&
               face->root.internal->incremental_interface->funcs->
                 get_glyph_metrics                                 )
          {
            face->horizontal.number_Of_HMetrics = 0;
            error                               = FT_Err_Ok;
          }
#endif
 
        }
      }
 
      if ( error )
        goto Exit;
 
      /* try to load the `vhea' and `vmtx' tables */
      LOADM_( hhea, 1 );
      if ( !error )
      {
        LOADM_( hmtx, 1 );
        if ( !error )
          face->vertical_info = 1;
      }
 
      if ( error && FT_ERR_NEQ( error, Table_Missing ) )
        goto Exit;
 
      LOAD_( os2 );
      if ( error )
      {
        /* we treat the table as missing if there are any errors */
        face->os2.version = 0xFFFFU;
      }
    }
 
    /* the optional tables */
 
    /* embedded bitmap support */
    if ( sfnt->load_eblc )
      LOAD_( eblc );
 
    /* consider the pclt, kerning, and gasp tables as optional */
    LOAD_( pclt );
    LOAD_( gasp );
    LOAD_( kern );
 
    face->root.num_glyphs = face->max_profile.numGlyphs;
 
    /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes  */
    /* a WWS-only font face.  `WWS' stands for `weight', width', and */
    /* `slope', a term used by Microsoft's Windows Presentation      */
    /* Foundation (WPF).  This flag has been introduced in version   */
    /* 1.5 of the OpenType specification (May 2008).                 */
 
    face->root.family_name = NULL;
    face->root.style_name  = NULL;
    if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 )
    {
      if ( !ignore_typographic_family )
        GET_NAME( TYPOGRAPHIC_FAMILY, &face->root.family_name );
      if ( !face->root.family_name )
        GET_NAME( FONT_FAMILY, &face->root.family_name );
 
      if ( !ignore_typographic_subfamily )
        GET_NAME( TYPOGRAPHIC_SUBFAMILY, &face->root.style_name );
      if ( !face->root.style_name )
        GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
    }
    else
    {
      GET_NAME( WWS_FAMILY, &face->root.family_name );
      if ( !face->root.family_name && !ignore_typographic_family )
        GET_NAME( TYPOGRAPHIC_FAMILY, &face->root.family_name );
      if ( !face->root.family_name )
        GET_NAME( FONT_FAMILY, &face->root.family_name );
 
      GET_NAME( WWS_SUBFAMILY, &face->root.style_name );
      if ( !face->root.style_name && !ignore_typographic_subfamily )
        GET_NAME( TYPOGRAPHIC_SUBFAMILY, &face->root.style_name );
      if ( !face->root.style_name )
        GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
    }
 
    /* now set up root fields */
    {
      FT_Face  root  = &face->root;
      FT_Long  flags = root->face_flags;
 
 
      /*********************************************************************/
      /*                                                                   */
      /* Compute face flags.                                               */
      /*                                                                   */
      if ( face->sbit_table_type == TT_SBIT_TABLE_TYPE_CBLC ||
           face->sbit_table_type == TT_SBIT_TABLE_TYPE_SBIX )
        flags |= FT_FACE_FLAG_COLOR;      /* color glyphs */
 
      if ( has_outline == TRUE )
        flags |= FT_FACE_FLAG_SCALABLE;   /* scalable outlines */
 
      /* The sfnt driver only supports bitmap fonts natively, thus we */
      /* don't set FT_FACE_FLAG_HINTER.                               */
      flags |= FT_FACE_FLAG_SFNT       |  /* SFNT file format  */
               FT_FACE_FLAG_HORIZONTAL;   /* horizontal data   */
 
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
      if ( !psnames_error                             &&
           face->postscript.FormatType != 0x00030000L )
        flags |= FT_FACE_FLAG_GLYPH_NAMES;
#endif
 
      /* fixed width font? */
      if ( face->postscript.isFixedPitch )
        flags |= FT_FACE_FLAG_FIXED_WIDTH;
 
      /* vertical information? */
      if ( face->vertical_info )
        flags |= FT_FACE_FLAG_VERTICAL;
 
      /* kerning available ? */
      if ( TT_FACE_HAS_KERNING( face ) )
        flags |= FT_FACE_FLAG_KERNING;
 
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
      /* Don't bother to load the tables unless somebody asks for them. */
      /* No need to do work which will (probably) not be used.          */
      if ( face->variation_support & TT_FACE_FLAG_VAR_FVAR )
      {
        if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 &&
             tt_face_lookup_table( face, TTAG_gvar ) != 0 )
          flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
        if ( tt_face_lookup_table( face, TTAG_CFF2 ) != 0 )
          flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
      }
#endif
 
      root->face_flags = flags;
 
      /*********************************************************************/
      /*                                                                   */
      /* Compute style flags.                                              */
      /*                                                                   */
 
      flags = 0;
      if ( has_outline == TRUE && face->os2.version != 0xFFFFU )
      {
        /* We have an OS/2 table; use the `fsSelection' field.  Bit 9 */
        /* indicates an oblique font face.  This flag has been        */
        /* introduced in version 1.5 of the OpenType specification.   */
 
        if ( face->os2.fsSelection & 512 )       /* bit 9 */
          flags |= FT_STYLE_FLAG_ITALIC;
        else if ( face->os2.fsSelection & 1 )    /* bit 0 */
          flags |= FT_STYLE_FLAG_ITALIC;
 
        if ( face->os2.fsSelection & 32 )        /* bit 5 */
          flags |= FT_STYLE_FLAG_BOLD;
      }
      else
      {
        /* this is an old Mac font, use the header field */
 
        if ( face->header.Mac_Style & 1 )
          flags |= FT_STYLE_FLAG_BOLD;
 
        if ( face->header.Mac_Style & 2 )
          flags |= FT_STYLE_FLAG_ITALIC;
      }
 
      root->style_flags |= flags;
 
      /*********************************************************************/
      /*                                                                   */
      /* Polish the charmaps.                                              */
      /*                                                                   */
      /*   Try to set the charmap encoding according to the platform &     */
      /*   encoding ID of each charmap.  Emulate Unicode charmap if one    */
      /*   is missing.                                                     */
      /*                                                                   */
 
      tt_face_build_cmaps( face );  /* ignore errors */
 
 
      /* set the encoding fields */
      {
        FT_Int   m;
#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
        FT_Bool  has_unicode = FALSE;
#endif
 
 
        for ( m = 0; m < root->num_charmaps; m++ )
        {
          FT_CharMap  charmap = root->charmaps[m];
 
 
          charmap->encoding = sfnt_find_encoding( charmap->platform_id,
                                                  charmap->encoding_id );
 
#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
 
          if ( charmap->encoding == FT_ENCODING_UNICODE   ||
               charmap->encoding == FT_ENCODING_MS_SYMBOL )  /* PUA */
            has_unicode = TRUE;
        }
 
        /* synthesize Unicode charmap if one is missing */
        if ( !has_unicode )
        {
          FT_CharMapRec cmaprec;
 
 
          cmaprec.face        = root;
          cmaprec.platform_id = TT_PLATFORM_MICROSOFT;
          cmaprec.encoding_id = TT_MS_ID_UNICODE_CS;
          cmaprec.encoding    = FT_ENCODING_UNICODE;
 
 
          error = FT_CMap_New( (FT_CMap_Class)&tt_cmap_unicode_class_rec,
                               NULL, &cmaprec, NULL );
          if ( error                                      &&
               FT_ERR_NEQ( error, No_Unicode_Glyph_Name ) )
            goto Exit;
          error = FT_Err_Ok;
 
#endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */
 
        }
      }
 
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
 
      /*
       *  Now allocate the root array of FT_Bitmap_Size records and
       *  populate them.  Unfortunately, it isn't possible to indicate bit
       *  depths in the FT_Bitmap_Size record.  This is a design error.
       */
      {
        FT_UInt  count;
 
 
        count = face->sbit_num_strikes;
 
        if ( count > 0 )
        {
          FT_Memory        memory   = face->root.stream->memory;
          FT_UShort        em_size  = face->header.Units_Per_EM;
          FT_Short         avgwidth = face->os2.xAvgCharWidth;
          FT_Size_Metrics  metrics;
 
          FT_UInt*  sbit_strike_map = NULL;
          FT_UInt   strike_idx, bsize_idx;
 
 
          if ( em_size == 0 || face->os2.version == 0xFFFFU )
          {
            avgwidth = 1;
            em_size = 1;
          }
 
          /* to avoid invalid strike data in the `available_sizes' field */
          /* of `FT_Face', we map `available_sizes' indices to strike    */
          /* indices                                                     */
          if ( FT_NEW_ARRAY( root->available_sizes, count ) ||
               FT_NEW_ARRAY( sbit_strike_map, count ) )
            goto Exit;
 
          bsize_idx = 0;
          for ( strike_idx = 0; strike_idx < count; strike_idx++ )
          {
            FT_Bitmap_Size*  bsize = root->available_sizes + bsize_idx;
 
 
            error = sfnt->load_strike_metrics( face, strike_idx, &metrics );
            if ( error )
              continue;
 
            bsize->height = (FT_Short)( metrics.height >> 6 );
            bsize->width  = (FT_Short)(
              ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size );
 
            bsize->x_ppem = metrics.x_ppem << 6;
            bsize->y_ppem = metrics.y_ppem << 6;
 
            /* assume 72dpi */
            bsize->size   = metrics.y_ppem << 6;
 
            /* only use strikes with valid PPEM values */
            if ( bsize->x_ppem && bsize->y_ppem )
              sbit_strike_map[bsize_idx++] = strike_idx;
          }
 
          /* reduce array size to the actually used elements */
          (void)FT_RENEW_ARRAY( sbit_strike_map, count, bsize_idx );
 
          /* from now on, all strike indices are mapped */
          /* using `sbit_strike_map'                    */
          if ( bsize_idx )
          {
            face->sbit_strike_map = sbit_strike_map;
 
            root->face_flags     |= FT_FACE_FLAG_FIXED_SIZES;
            root->num_fixed_sizes = (FT_Int)bsize_idx;
          }
        }
      }
 
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
 
      /* a font with no bitmaps and no outlines is scalable; */
      /* it has only empty glyphs then                       */
      if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) )
        root->face_flags |= FT_FACE_FLAG_SCALABLE;
 
 
      /*********************************************************************/
      /*                                                                   */
      /*  Set up metrics.                                                  */
      /*                                                                   */
      if ( FT_IS_SCALABLE( root ) )
      {
        /* XXX What about if outline header is missing */
        /*     (e.g. sfnt wrapped bitmap)?             */
        root->bbox.xMin    = face->header.xMin;
        root->bbox.yMin    = face->header.yMin;
        root->bbox.xMax    = face->header.xMax;
        root->bbox.yMax    = face->header.yMax;
        root->units_per_EM = face->header.Units_Per_EM;
 
 
        /* XXX: Computing the ascender/descender/height is very different */
        /*      from what the specification tells you.  Apparently, we    */
        /*      must be careful because                                   */
        /*                                                                */
        /*      - not all fonts have an OS/2 table; in this case, we take */
        /*        the values in the horizontal header.  However, these    */
        /*        values very often are not reliable.                     */
        /*                                                                */
        /*      - otherwise, the correct typographic values are in the    */
        /*        sTypoAscender, sTypoDescender & sTypoLineGap fields.    */
        /*                                                                */
        /*        However, certain fonts have these fields set to 0.      */
        /*        Rather, they have usWinAscent & usWinDescent correctly  */
        /*        set (but with different values).                        */
        /*                                                                */
        /*      As an example, Arial Narrow is implemented through four   */
        /*      files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
        /*                                                                */
        /*      Strangely, all fonts have the same values in their        */
        /*      sTypoXXX fields, except ARIALNB which sets them to 0.     */
        /*                                                                */
        /*      On the other hand, they all have different                */
        /*      usWinAscent/Descent values -- as a conclusion, the OS/2   */
        /*      table cannot be used to compute the text height reliably! */
        /*                                                                */
 
        /* The ascender and descender are taken from the `hhea' table. */
        /* If zero, they are taken from the `OS/2' table.              */
 
        root->ascender  = face->horizontal.Ascender;
        root->descender = face->horizontal.Descender;
 
        root->height = root->ascender - root->descender +
                       face->horizontal.Line_Gap;
 
        if ( !( root->ascender || root->descender ) )
        {
          if ( face->os2.version != 0xFFFFU )
          {
            if ( face->os2.sTypoAscender || face->os2.sTypoDescender )
            {
              root->ascender  = face->os2.sTypoAscender;
              root->descender = face->os2.sTypoDescender;
 
              root->height = root->ascender - root->descender +
                             face->os2.sTypoLineGap;
            }
            else
            {
              root->ascender  =  (FT_Short)face->os2.usWinAscent;
              root->descender = -(FT_Short)face->os2.usWinDescent;
 
              root->height = root->ascender - root->descender;
            }
          }
        }
 
        root->max_advance_width  =
          (FT_Short)face->horizontal.advance_Width_Max;
        root->max_advance_height =
          (FT_Short)( face->vertical_info ? face->vertical.advance_Height_Max
                                          : root->height );
 
        /* See https://www.microsoft.com/typography/otspec/post.htm -- */
        /* Adjust underline position from top edge to centre of        */
        /* stroke to convert TrueType meaning to FreeType meaning.     */
        root->underline_position  = face->postscript.underlinePosition -
                                    face->postscript.underlineThickness / 2;
        root->underline_thickness = face->postscript.underlineThickness;
      }
 
    }
 
  Exit:
    FT_TRACE2(( "sfnt_load_face: done\n" ));
 
    return error;
  }

tt_face_get_name()

tt_face_get_name	(	TT_Face	face,
		FT_UShort	nameid,
		FT_String **	name
	)

Definition at line 132 of file sfobjs.c.

  {
    FT_Memory   memory = face->root.memory;
    FT_Error    error  = FT_Err_Ok;
    FT_String*  result = NULL;
    FT_UShort   n;
    TT_Name     rec;
 
    FT_Int  found_apple         = -1;
    FT_Int  found_apple_roman   = -1;
    FT_Int  found_apple_english = -1;
    FT_Int  found_win           = -1;
    FT_Int  found_unicode       = -1;
 
    FT_Bool  is_english = 0;
 
    TT_Name_ConvertFunc  convert;
 
 
    FT_ASSERT( name );
 
    rec = face->name_table.names;
    for ( n = 0; n < face->num_names; n++, rec++ )
    {
      /* According to the OpenType 1.3 specification, only Microsoft or  */
      /* Apple platform IDs might be used in the `name' table.  The      */
      /* `Unicode' platform is reserved for the `cmap' table, and the    */
      /* `ISO' one is deprecated.                                        */
      /*                                                                 */
      /* However, the Apple TrueType specification doesn't say the same  */
      /* thing and goes to suggest that all Unicode `name' table entries */
      /* should be coded in UTF-16 (in big-endian format I suppose).     */
      /*                                                                 */
      if ( rec->nameID == nameid && rec->stringLength > 0 )
      {
        switch ( rec->platformID )
        {
        case TT_PLATFORM_APPLE_UNICODE:
        case TT_PLATFORM_ISO:
          /* there is `languageID' to check there.  We should use this */
          /* field only as a last solution when nothing else is        */
          /* available.                                                */
          /*                                                           */
          found_unicode = n;
          break;
 
        case TT_PLATFORM_MACINTOSH:
          /* This is a bit special because some fonts will use either    */
          /* an English language id, or a Roman encoding id, to indicate */
          /* the English version of its font name.                       */
          /*                                                             */
          if ( rec->languageID == TT_MAC_LANGID_ENGLISH )
            found_apple_english = n;
          else if ( rec->encodingID == TT_MAC_ID_ROMAN )
            found_apple_roman = n;
          break;
 
        case TT_PLATFORM_MICROSOFT:
          /* we only take a non-English name when there is nothing */
          /* else available in the font                            */
          /*                                                       */
          if ( found_win == -1 || ( rec->languageID & 0x3FF ) == 0x009 )
          {
            switch ( rec->encodingID )
            {
            case TT_MS_ID_SYMBOL_CS:
            case TT_MS_ID_UNICODE_CS:
            case TT_MS_ID_UCS_4:
              is_english = FT_BOOL( ( rec->languageID & 0x3FF ) == 0x009 );
              found_win  = n;
              break;
 
            default:
              ;
            }
          }
          break;
 
        default:
          ;
        }
      }
    }
 
    found_apple = found_apple_roman;
    if ( found_apple_english >= 0 )
      found_apple = found_apple_english;
 
    /* some fonts contain invalid Unicode or Macintosh formatted entries; */
    /* we will thus favor names encoded in Windows formats if available   */
    /* (provided it is an English name)                                   */
    /*                                                                    */
    convert = NULL;
    if ( found_win >= 0 && !( found_apple >= 0 && !is_english ) )
    {
      rec = face->name_table.names + found_win;
      switch ( rec->encodingID )
      {
        /* all Unicode strings are encoded using UTF-16BE */
      case TT_MS_ID_UNICODE_CS:
      case TT_MS_ID_SYMBOL_CS:
        convert = tt_name_ascii_from_utf16;
        break;
 
      case TT_MS_ID_UCS_4:
        /* Apparently, if this value is found in a name table entry, it is */
        /* documented as `full Unicode repertoire'.  Experience with the   */
        /* MsGothic font shipped with Windows Vista shows that this really */
        /* means UTF-16 encoded names (UCS-4 values are only used within   */
        /* charmaps).                                                      */
        convert = tt_name_ascii_from_utf16;
        break;
 
      default:
        ;
      }
    }
    else if ( found_apple >= 0 )
    {
      rec     = face->name_table.names + found_apple;
      convert = tt_name_ascii_from_other;
    }
    else if ( found_unicode >= 0 )
    {
      rec     = face->name_table.names + found_unicode;
      convert = tt_name_ascii_from_utf16;
    }
 
    if ( rec && convert )
    {
      if ( !rec->string )
      {
        FT_Stream  stream = face->name_table.stream;
 
 
        if ( FT_QNEW_ARRAY ( rec->string, rec->stringLength ) ||
             FT_STREAM_SEEK( rec->stringOffset )              ||
             FT_STREAM_READ( rec->string, rec->stringLength ) )
        {
          FT_FREE( rec->string );
          rec->stringLength = 0;
          result            = NULL;
          goto Exit;
        }
      }
 
      result = convert( rec, memory );
    }
 
  Exit:
    *name = result;
    return error;
  }