freetype2/src/sfnt/sfobjs.c

/***************************************************************************/
/*                                                                         */
/*  sfobjs.c                                                               */
/*                                                                         */
/*    SFNT object management (base).                                       */
/*                                                                         */
/*  Copyright 1996-2000 by                                                 */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#include <freetype/internal/ftobjs.h>
#include <freetype/internal/sfnt.h>
#include <freetype/internal/psnames.h>
#include <freetype/ttnameid.h>


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_sfobjs


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    Get_Name                                                           */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Returns a given ENGLISH name record in ASCII.                      */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the source face object.                      */
  /*                                                                       */
  /*    nameid :: The name id of the name record to return.                */
  /*                                                                       */
  /* <Return>                                                              */
  /*    Character string.  NULL if no name is present.                     */
  /*                                                                       */
  static
  FT_String*  Get_Name( TT_Face    face,
                        FT_UShort  nameid )
  {
    FT_Memory    memory = face->root.memory;
    FT_UShort    n;
    TT_NameRec*  rec;
    FT_Bool      wide_chars = 1;


    rec = face->name_table.names;
    for ( n = 0; n < face->name_table.numNameRecords; n++, rec++ )
    {
      if ( rec->nameID == nameid )
      {
        /* found the name - now create an ASCII string from it */
        FT_Bool  found = 0;


        /* test for Microsoft English language */
        if ( rec->platformID == TT_PLATFORM_MICROSOFT &&
             rec->encodingID <= TT_MS_ID_UNICODE_CS   &&
             ( rec->languageID & 0x3FF ) == 0x009     )
          found = 1;

        /* test for Apple Unicode encoding */
        else if ( rec->platformID == TT_PLATFORM_APPLE_UNICODE )
          found = 1;

        /* test for Apple Roman */
        else if ( rec->platformID == TT_PLATFORM_MACINTOSH &&
                  rec->languageID == TT_MAC_ID_ROMAN       )
        {
          found      = 1;
          wide_chars = 0;
        }

        /* found a Unicode name */
        if ( found )
        {
          FT_String*  string;
          FT_UInt     len;


          if ( wide_chars )
          {
            TT_UInt   m;


            len = (TT_UInt)rec->stringLength / 2;
            if ( MEM_Alloc( string, len + 1 ) )
              return NULL;

            for ( m = 0; m < len; m ++ )
              string[m] = rec->string[2 * m + 1];
          }
          else
          {
            len = rec->stringLength;
            if ( MEM_Alloc( string, len + 1 ) )
              return NULL;

            MEM_Copy( string, rec->string, len );
          }

          string[len] = '\0';
          return string;
        }
      }
    }

    return NULL;
  }


  static
  FT_Encoding  find_encoding( int  platform_id,
                              int  encoding_id )
  {
    typedef struct  TEncoding
    {
      int          platform_id;
      int          encoding_id;
      FT_Encoding  encoding;

    } TEncoding;

    static const TEncoding  tt_encodings[] =
    {
      { TT_PLATFORM_ISO,           -1,                  ft_encoding_unicode },

      { TT_PLATFORM_APPLE_UNICODE, -1,                  ft_encoding_unicode },

      { TT_PLATFORM_MACINTOSH,     TT_MAC_ID_ROMAN,     ft_encoding_apple_roman },

      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_UNICODE_CS, ft_encoding_unicode },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_SJIS,       ft_encoding_sjis },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_GB2312,     ft_encoding_gb2312 },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_BIG_5,      ft_encoding_big5 },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_WANSUNG,    ft_encoding_wansung },
      { TT_PLATFORM_MICROSOFT,     TT_MS_ID_JOHAB,      ft_encoding_johab }
    };

    const TEncoding  *cur, *limit;


    cur   = tt_encodings;
    limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] );

    for ( ; cur < limit; cur++ )
    {
      if ( cur->platform_id == platform_id )
      {
        if ( cur->encoding_id == encoding_id ||
             cur->encoding_id == -1          )
          return cur->encoding;
      }
    }

    return ft_encoding_none;
  }


  LOCAL_FUNC
  FT_Error  SFNT_Init_Face( FT_Stream      stream,
                            TT_Face        face,
                            TT_Int         face_index,
                            TT_Int         num_params,
                            FT_Parameter*  params )
  {
    FT_Error            error;
    SFNT_Interface*     sfnt;
    PSNames_Interface*  psnames;
    SFNT_Header         sfnt_header;

    /* for now, parameters are unused */
    UNUSED( num_params );
    UNUSED( params );


    sfnt = (SFNT_Interface*)face->sfnt;
    if ( !sfnt )
    {
      /* look-up the SFNT driver */
      FT_Driver  sfnt_driver;


      sfnt_driver = FT_Get_Driver( face->root.driver->library, "sfnt" );
      if ( !sfnt_driver )
      {
        error = FT_Err_Invalid_File_Format;
        goto Exit;
      }

      sfnt = (SFNT_Interface*)( sfnt_driver->interface.format_interface );
      if ( !sfnt )
      {
        error = FT_Err_Invalid_File_Format;
        goto Exit;
      }

      face->sfnt       = sfnt;
      face->goto_table = sfnt->goto_table;
    }

    psnames = (PSNames_Interface*)face->psnames;
    if ( !psnames )
    {
      /* look-up the PSNames driver */
      FT_Driver  psnames_driver;


      psnames_driver = FT_Get_Driver( face->root.driver->library, "psnames" );
      if ( psnames_driver )
        face->psnames = (PSNames_Interface*)
                          ( psnames_driver->interface.format_interface );
    }

    /* check that we have a valid TrueType file */
    error = sfnt->load_sfnt_header( face, stream, face_index, &sfnt_header );
    if ( error )
      goto Exit;

    face->format_tag = sfnt_header.format_tag;
    face->num_tables = sfnt_header.num_tables;

    /* Load font directory */
    error = sfnt->load_directory( face, stream, &sfnt_header );
    if ( error )
      goto Exit;

    face->root.num_faces = face->ttc_header.DirCount;
    if ( face->root.num_faces < 1 )
      face->root.num_faces = 1;

  Exit:
    return error;
  }


#undef  LOAD_
#define LOAD_( x )  ( (error = sfnt->load_##x( face, stream )) != FT_Err_Ok )


  LOCAL_FUNC
  TT_Error  SFNT_Load_Face( FT_Stream      stream,
                            TT_Face        face,
                            TT_Int         face_index,
                            TT_Int         num_params,
                            FT_Parameter*  params )
  {
    FT_Error         error;
    SFNT_Interface*  sfnt = (SFNT_Interface*)face->sfnt;


    /* Load tables */
    if ( LOAD_( header )        ||
         LOAD_( max_profile )   ||

         /* load the `hhea' & `hmtx' tables at once */
         ( error = sfnt->load_metrics( face, stream, 0 ) ) != FT_Err_Ok  ||

         /* try to load the `vhea' & `vmtx' at once if present */
         ( error = sfnt->load_metrics( face, stream, 1 ) ) != FT_Err_Ok  ||

         LOAD_( charmaps )      ||
         LOAD_( names )         ||
         LOAD_( os2 )           ||
         LOAD_( psnames )       )
     goto Exit;

    /* the optional tables */

#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
    /* embedded bitmap support. */
    if ( sfnt->load_sbits && LOAD_( sbits ) )
      goto Exit;
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

    if ( LOAD_( hdmx )          ||
         LOAD_( gasp )          ||
         LOAD_( kerning )       ||
		 LOAD_( pclt )          )
      goto Exit;

#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
    if ( ( error = TT_Extension_Create( face ) ) != FT_Err_Ok )
      goto Exit;
#endif

    face->root.family_name = Get_Name( face, TT_NAME_ID_FONT_FAMILY );
    face->root.style_name  = Get_Name( face, TT_NAME_ID_FONT_SUBFAMILY );

    /* now set up root fields */
    {
      FT_Face     root = &face->root;
      FT_Int      flags;
      TT_CharMap  charmap;
      TT_Int      n;
      FT_Memory   memory;


      memory = root->memory;

      /*********************************************************************/
      /*                                                                   */
      /* Compute face flags.                                               */
      /*                                                                   */
      flags = FT_FACE_FLAG_SCALABLE  |    /* scalable outlines */
              FT_FACE_FLAG_SFNT      |    /* SFNT file format  */
              FT_FACE_FLAG_HORIZONTAL;    /* horizontal data   */

      /* 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 ( face->kern_pairs )
        flags |= FT_FACE_FLAG_KERNING;

      root->face_flags = flags;

      /*********************************************************************/
      /*                                                                   */
      /* Compute style flags.                                              */
      /*                                                                   */
      flags = 0;

      if ( face->os2.version != 0xFFFF )
      {
        /* we have an OS/2 table; use the `fsSelection' field */
        if ( face->os2.fsSelection & 1 )
          flags |= FT_STYLE_FLAG_ITALIC;

        if ( face->os2.fsSelection & 32 )
          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;
      }

      face->root.style_flags = flags;

      /*********************************************************************/
      /*                                                                   */
      /* Polish the charmaps.                                              */
      /*                                                                   */
      /*   Try to set the charmap encoding according to the platform &     */
      /*   encoding ID of each charmap.                                    */
      /*                                                                   */
      charmap            = face->charmaps;
      root->num_charmaps = face->num_charmaps;

      /* allocate table of pointers */
      if ( ALLOC_ARRAY( root->charmaps, root->num_charmaps, FT_CharMap ) )
        goto Exit;

      for ( n = 0; n < root->num_charmaps; n++, charmap++ )
      {
        FT_Int  platform = charmap->cmap.platformID;
        FT_Int  encoding = charmap->cmap.platformEncodingID;


        charmap->root.face        = (FT_Face)face;
        charmap->root.platform_id = platform;
        charmap->root.encoding_id = encoding;
        charmap->root.encoding    = find_encoding( platform, encoding );

        /* now, set root->charmap with a unicode charmap */
        /* wherever available                            */
        if ( !root->charmap                                &&
             charmap->root.encoding == ft_encoding_unicode )
          root->charmap = (FT_CharMap)charmap;

        root->charmaps[n] = (FT_CharMap)charmap;
      }

#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
      if ( face->num_sbit_strikes )
      {
       face->root.num_fixed_sizes = face->num_sbit_strikes;
       if ( ALLOC_ARRAY( face->root.available_sizes,
                         face->num_sbit_strikes,
                         FT_Bitmap_Size ) )
         return error;

        for ( n = 0 ; n < face->num_sbit_strikes ; n++ )
        {
          face->root.available_sizes[n].width =
            face->sbit_strikes[n].x_ppem;
          face->root.available_sizes[n].height =
            face->sbit_strikes[n].y_ppem;
        }
      }
      else
#else /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
      {
       root->num_fixed_sizes = 0;
       root->available_sizes = 0;
      }
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

      /*********************************************************************/
      /*                                                                   */
      /*  Set up metrics.                                                  */
      /*                                                                   */
      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;

      /* The ascender/descender/height are computed from the OS/2 table    */
      /* when found.  Otherwise, they're taken from the horizontal header. */
      if ( face->os2.version != 0xFFFF )
      {
        root->ascender  =  face->os2.sTypoAscender;
        root->descender = -face->os2.sTypoDescender;
        root->height    =  root->ascender + root->descender +
                           face->os2.sTypoLineGap;
      }
      else
      {
        root->ascender  = face->horizontal.Ascender;
        root->descender = face->horizontal.Descender;
        root->height    = root->ascender + root->descender +
                          face->horizontal.Line_Gap;
      }

      root->max_advance_width   = face->horizontal.advance_Width_Max;

      root->max_advance_height  = face->vertical_info
                                    ? face->vertical.advance_Height_Max
                                    : root->height;

      root->underline_position  = face->postscript.underlinePosition;
      root->underline_thickness = face->postscript.underlineThickness;

      /* root->max_points      - already set up */
      /* root->max_contours    - already set up */
    }

  Exit:
    return error;
  }


#undef LOAD_


  LOCAL_FUNC
  void  SFNT_Done_Face( TT_Face  face )
  {
    FT_Memory        memory = face->root.memory;
    SFNT_Interface*  sfnt   = 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_sbits )
        sfnt->free_sbits( face );
    }

    /* freeing the kerning table */
    FREE( face->kern_pairs );
    face->num_kern_pairs = 0;

    /* freeing the collection table */
    FREE( face->ttc_header.TableDirectory );
    face->ttc_header.DirCount = 0;

    /* freeing table directory */
    FREE( face->dir_tables );
    face->num_tables = 0;

    /* freeing the character mapping tables */
    if (sfnt && sfnt->load_charmaps )
    {
      FT_UShort  n;


      for ( n = 0; n < face->num_charmaps; n++ )
        sfnt->free_charmap( face, &face->charmaps[n].cmap );
    }

    FREE( face->charmaps );
    face->num_charmaps = 0;

    FREE( face->root.charmaps );
    face->root.num_charmaps = 0;
    face->root.charmap      = 0;

    /* freeing the horizontal metrics */
    FREE( face->horizontal.long_metrics );
    FREE( face->horizontal.short_metrics );

    /* freeing the vertical ones, if any */
    if ( face->vertical_info )
    {
      FREE( face->vertical.long_metrics  );
      FREE( face->vertical.short_metrics );
      face->vertical_info = 0;
    }

    /* freeing the gasp table */
    FREE( face->gasp.gaspRanges );
    face->gasp.numRanges = 0;

    /* freeing the name table */
    sfnt->free_names( face );

    /* freeing the hdmx table */
    sfnt->free_hdmx( face );

    /* freeing family and style name */
    FREE( face->root.family_name );
    FREE( face->root.style_name );

    /* freeing sbit size table */
    face->root.num_fixed_sizes = 0;
    if ( face->root.available_sizes )
      FREE( face->root.available_sizes );

    face->sfnt = 0;
  }


/* END */