winfnt.c

a very goog book

    (FT_CMap_CharNextFunc) fnt_cmap_char_next
  };

  static FT_CMap_Class  fnt_cmap_class = &fnt_cmap_class_rec;


#else /* !FT_CONFIG_OPTION_USE_CMAPS */


  static FT_UInt
  FNT_Get_Char_Index( FT_CharMap  charmap,
                      FT_Long     char_code )
  {
    FT_Long  result = char_code;


    if ( charmap )
    {
      FNT_Font  font  = ((FNT_Face)charmap->face)->fonts;
      FT_Long   first = font->header.first_char;
      FT_Long   count = font->header.last_char - first + 1;


      char_code -= first;
      if ( char_code < count )
        result = char_code + 1;
      else
        result = 0;
    }

    return result;
  }


  static FT_Long
  FNT_Get_Next_Char( FT_CharMap  charmap,
                     FT_Long     char_code )
  {
    char_code++;
    if ( charmap )
    {
      FNT_Font  font  = ((FNT_Face)charmap->face)->fonts;
      FT_Long   first = font->header.first_char;


      if ( char_code < first )
        char_code = first;
      if ( char_code <= font->header.last_char )
        return char_code;
    }
    else
      return char_code;
    return 0;
  }

#endif /* !FT_CONFIG_OPTION_USE_CMAPS */


  static void
  FNT_Face_Done( FNT_Face  face )
  {
    FT_Memory  memory = FT_FACE_MEMORY( face );


    fnt_face_done_fonts( face );

    FT_FREE( face->root.available_sizes );
    face->root.num_fixed_sizes = 0;
  }


  static FT_Error
  FNT_Face_Init( FT_Stream      stream,
                 FNT_Face       face,
                 FT_Int         face_index,
                 FT_Int         num_params,
                 FT_Parameter*  params )
  {
    FT_Error   error;
    FT_Memory  memory = FT_FACE_MEMORY( face );

    FT_UNUSED( num_params );
    FT_UNUSED( params );
    FT_UNUSED( face_index );


    /* try to load several fonts from a DLL */
    error = fnt_face_get_dll_fonts( face );
    if ( error )
    {
      /* this didn't work, now try to load a single FNT font */
      FNT_Font  font;


      if ( FT_NEW( face->fonts ) )
        goto Exit;

      face->num_fonts = 1;
      font            = face->fonts;

      font->offset   = 0;
      font->fnt_size = stream->size;

      error = fnt_font_load( font, stream );
      if ( error )
        goto Fail;
    }

    /* all right, one or more fonts were loaded; we now need to */
    /* fill the root FT_Face fields with relevant information   */
    {
      FT_Face   root  = FT_FACE( face );
      FNT_Font  fonts = face->fonts;
      FNT_Font  limit = fonts + face->num_fonts;
      FNT_Font  cur;


      root->num_faces  = 1;
      root->face_flags = FT_FACE_FLAG_FIXED_SIZES |
                         FT_FACE_FLAG_HORIZONTAL;

      if ( fonts->header.avg_width == fonts->header.max_width )
        root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;

      if ( fonts->header.italic )
        root->style_flags |= FT_STYLE_FLAG_ITALIC;

      if ( fonts->header.weight >= 800 )
        root->style_flags |= FT_STYLE_FLAG_BOLD;

      /* Setup the `fixed_sizes' array */
      if ( FT_NEW_ARRAY( root->available_sizes, face->num_fonts ) )
        goto Fail;

      root->num_fixed_sizes = face->num_fonts;

      {
        FT_Bitmap_Size*  size = root->available_sizes;


        for ( cur = fonts; cur < limit; cur++, size++ )
        {
          size->width  = cur->header.pixel_width;
          size->height = cur->header.pixel_height;
        }
      }

#ifdef FT_CONFIG_OPTION_USE_CMAPS

      {
        FT_CharMapRec  charmap;

        charmap.encoding    = ft_encoding_unicode;
        charmap.platform_id = 3;
        charmap.encoding_id = 1;
        charmap.face        = root;

        error = FT_CMap_New( fnt_cmap_class,
                             NULL,
                             &charmap,
                             NULL );
        if ( error )
          goto Fail;

        /* Select default charmap */
        if ( root->num_charmaps )
          root->charmap = root->charmaps[0];
      }

#else /* !FT_CONFIG_OPTION_USE_CMAPS */

      /* Setup the `charmaps' array */
      root->charmaps     = &face->charmap_handle;
      root->num_charmaps = 1;

      face->charmap.encoding    = ft_encoding_unicode;
      face->charmap.platform_id = 3;
      face->charmap.encoding_id = 1;
      face->charmap.face        = root;

      face->charmap_handle = &face->charmap;

      root->charmap = face->charmap_handle;

#endif /* !FT_CONFIG_OPTION_USE_CMAPS */

      /* setup remaining flags */
      root->num_glyphs = fonts->header.last_char -
                         fonts->header.first_char + 1;

      root->family_name = (FT_String*)fonts->fnt_frame +
                          fonts->header.face_name_offset;
      root->style_name  = (char *)"Regular";

      if ( root->style_flags & FT_STYLE_FLAG_BOLD )
      {
        if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
          root->style_name = (char *)"Bold Italic";
        else
          root->style_name = (char *)"Bold";
      }
      else if ( root->style_flags & FT_STYLE_FLAG_ITALIC )
        root->style_name = (char *)"Italic";
    }

  Fail:
    if ( error )
      FNT_Face_Done( face );

  Exit:
    return error;
  }


  static FT_Error
  FNT_Size_Set_Pixels( FNT_Size  size )
  {
    /* look up a font corresponding to the current pixel size */
    FNT_Face  face  = (FNT_Face)FT_SIZE_FACE( size );
    FNT_Font  cur   = face->fonts;
    FNT_Font  limit = cur + face->num_fonts;


    size->font = 0;
    for ( ; cur < limit; cur++ )
    {
      /* we only compare the character height, as fonts used some strange */
      /* values                                                           */
      if ( cur->header.pixel_height == size->root.metrics.y_ppem )
      {
        size->font = cur;

        size->root.metrics.ascender  = cur->header.ascent * 64;
        size->root.metrics.descender = ( cur->header.pixel_height -
                                           cur->header.ascent ) * 64;
        size->root.metrics.height    = cur->header.pixel_height * 64;
        break;
      }
    }

    return ( size->font ? FNT_Err_Ok : FNT_Err_Invalid_Pixel_Size );
  }


  static FT_Error
  FNT_Load_Glyph( FT_GlyphSlot  slot,
                  FNT_Size      size,
                  FT_UInt       glyph_index,
                  FT_Int        load_flags )
  {
    FNT_Font    font  = size->font;
    FT_Error    error = 0;
    FT_Byte*    p;
    FT_Int      len;
    FT_Bitmap*  bitmap = &slot->bitmap;
    FT_ULong    offset;
    FT_Bool     new_format;

    FT_UNUSED( slot );
    FT_UNUSED( load_flags );


    if ( !font )
    {
      error = FNT_Err_Invalid_Argument;
      goto Exit;
    }

    if ( glyph_index > 0 )
      glyph_index--;
    else
      glyph_index = font->header.default_char - font->header.first_char;

    new_format = FT_BOOL( font->header.version == 0x300 );
    len        = new_format ? 6 : 4;

    /* jump to glyph entry */
    p = font->fnt_frame + 118 + len * glyph_index;

    bitmap->width = FT_NEXT_SHORT_LE( p );

    if ( new_format )
      offset = FT_NEXT_ULONG_LE( p );
    else
      offset = FT_NEXT_USHORT_LE( p );

    /* jump to glyph data */
    p = font->fnt_frame + /* font->header.bits_offset */ + offset;

    /* allocate and build bitmap */
    {
      FT_Memory  memory = FT_FACE_MEMORY( slot->face );
      FT_Int     pitch  = ( bitmap->width + 7 ) >> 3;
      FT_Byte*   column;
      FT_Byte*   write;


      bitmap->pitch      = pitch;
      bitmap->rows       = font->header.pixel_height;
      bitmap->pixel_mode = ft_pixel_mode_mono;

      if ( FT_ALLOC( bitmap->buffer, pitch * bitmap->rows ) )
        goto Exit;

      column = (FT_Byte*)bitmap->buffer;

      for ( ; pitch > 0; pitch--, column++ )
      {
        FT_Byte*  limit = p + bitmap->rows;


        for ( write = column; p < limit; p++, write += bitmap->pitch )
          write[0] = p[0];
      }
    }

    slot->flags       = FT_GLYPH_OWN_BITMAP;
    slot->bitmap_left = 0;
    slot->bitmap_top  = font->header.ascent;
    slot->format      = ft_glyph_format_bitmap;

    /* now set up metrics */
    slot->metrics.horiAdvance  = bitmap->width << 6;
    slot->metrics.horiBearingX = 0;
    slot->metrics.horiBearingY = slot->bitmap_top << 6;

    slot->linearHoriAdvance    = (FT_Fixed)bitmap->width << 16;
    slot->format               = ft_glyph_format_bitmap;

  Exit:
    return error;
  }


  FT_CALLBACK_TABLE_DEF
  const FT_Driver_ClassRec  winfnt_driver_class =
  {
    {
      ft_module_font_driver,
      sizeof ( FT_DriverRec ),

      "winfonts",
      0x10000L,
      0x20000L,

      0,

      (FT_Module_Constructor)0,
      (FT_Module_Destructor) 0,
      (FT_Module_Requester)  0
    },

    sizeof( FNT_FaceRec ),
    sizeof( FNT_SizeRec ),
    sizeof( FT_GlyphSlotRec ),

    (FT_Face_InitFunc)        FNT_Face_Init,
    (FT_Face_DoneFunc)        FNT_Face_Done,
    (FT_Size_InitFunc)        0,
    (FT_Size_DoneFunc)        0,
    (FT_Slot_InitFunc)        0,
    (FT_Slot_DoneFunc)        0,

    (FT_Size_ResetPointsFunc) FNT_Size_Set_Pixels,
    (FT_Size_ResetPixelsFunc) FNT_Size_Set_Pixels,
    (FT_Slot_LoadFunc)        FNT_Load_Glyph,

#ifdef FT_CONFIG_OPTION_USE_CMAPS
    (FT_CharMap_CharIndexFunc)0,
#else
    (FT_CharMap_CharIndexFunc)FNT_Get_Char_Index,
#endif
    

    (FT_Face_GetKerningFunc)  0,
    (FT_Face_AttachFunc)      0,
    (FT_Face_GetAdvancesFunc) 0,

#ifdef FT_CONFIG_OPTION_USE_CMAPS
    (FT_CharMap_CharNextFunc) 0
#else
    (FT_CharMap_CharNextFunc) FNT_Get_Next_Char
#endif    
  };


/* END */