bdfdrivr.c

winNT技术操作系统,国外开放的原代码和LIUX一样

          bsize->width = (FT_Short)( bsize->height * 2/3 );

        prop = bdf_get_font_property( font, "POINT_SIZE" );
        if ( prop )
          /* convert from 722.7 decipoints to 72 points per inch */
          bsize->size =
            (FT_Pos)( ( prop->value.int32 * 64 * 7200 + 36135L ) / 72270L );
        else
          bsize->size = bsize->width << 6;

        prop = bdf_get_font_property( font, "PIXEL_SIZE" );
        if ( prop )
          bsize->y_ppem = (FT_Short)prop->value.int32 << 6;

        prop = bdf_get_font_property( font, "RESOLUTION_X" );
        if ( prop )
          resolution_x = (FT_Short)prop->value.int32;

        prop = bdf_get_font_property( font, "RESOLUTION_Y" );
        if ( prop )
          resolution_y = (FT_Short)prop->value.int32;

        if ( bsize->y_ppem == 0 )
        {
          bsize->y_ppem = bsize->size;
          if ( resolution_y )
            bsize->y_ppem = bsize->y_ppem * resolution_y / 72;
        }
        if ( resolution_x && resolution_y )
          bsize->x_ppem = bsize->y_ppem * resolution_x / resolution_y;
        else
          bsize->x_ppem = bsize->y_ppem;
      }

      /* encoding table */
      {
        bdf_glyph_t*   cur = font->glyphs;
        unsigned long  n;


        if ( FT_NEW_ARRAY( face->en_table, font->glyphs_size ) )
          goto Exit;

        face->default_glyph = 0;
        for ( n = 0; n < font->glyphs_size; n++ )
        {
          (face->en_table[n]).enc = cur[n].encoding;
          FT_TRACE4(( "idx %d, val 0x%lX\n", n, cur[n].encoding ));
          (face->en_table[n]).glyph = (FT_Short)n;

          if ( cur[n].encoding == font->default_char )
            face->default_glyph = n;
        }
      }

      /* charmaps */
      {
        bdf_property_t  *charset_registry = 0, *charset_encoding = 0;
        FT_Bool          unicode_charmap  = 0;


        charset_registry =
          bdf_get_font_property( font, "CHARSET_REGISTRY" );
        charset_encoding =
          bdf_get_font_property( font, "CHARSET_ENCODING" );
        if ( charset_registry && charset_encoding )
        {
          if ( charset_registry->format == BDF_ATOM &&
               charset_encoding->format == BDF_ATOM &&
               charset_registry->value.atom         &&
               charset_encoding->value.atom         )
          {
            const char*  s;


            if ( FT_NEW_ARRAY( face->charset_encoding,
                               ft_strlen( charset_encoding->value.atom ) + 1 ) )
              goto Exit;
            if ( FT_NEW_ARRAY( face->charset_registry,
                               ft_strlen( charset_registry->value.atom ) + 1 ) )
              goto Exit;

            ft_strcpy( face->charset_registry, charset_registry->value.atom );
            ft_strcpy( face->charset_encoding, charset_encoding->value.atom );

            /* Uh, oh, compare first letters manually to avoid dependency
               on locales. */
            s = face->charset_registry;
            if ( ( s[0] == 'i' || s[0] == 'I' ) &&
                 ( s[1] == 's' || s[1] == 'S' ) &&
                 ( s[2] == 'o' || s[2] == 'O' ) )
            {
              s += 3;
              if ( !ft_strcmp( s, "10646" )                      ||
                   ( !ft_strcmp( s, "8859" ) &&
                     !ft_strcmp( face->charset_encoding, "1" ) ) )
              unicode_charmap = 1;
            }

            {
              FT_CharMapRec  charmap;


              charmap.face        = FT_FACE( face );
              charmap.encoding    = FT_ENCODING_NONE;
              charmap.platform_id = 0;
              charmap.encoding_id = 0;

              if ( unicode_charmap )
              {
                charmap.encoding    = FT_ENCODING_UNICODE;
                charmap.platform_id = 3;
                charmap.encoding_id = 1;
              }

              error = FT_CMap_New( &bdf_cmap_class, NULL, &charmap, NULL );

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

            goto Exit;
          }
        }

        /* otherwise assume Adobe standard encoding */

        {
          FT_CharMapRec  charmap;


          charmap.face        = FT_FACE( face );
          charmap.encoding    = FT_ENCODING_ADOBE_STANDARD;
          charmap.platform_id = 7;
          charmap.encoding_id = 0;

          error = FT_CMap_New( &bdf_cmap_class, NULL, &charmap, NULL );

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

  Exit:
    return error;

  Fail:
    BDF_Face_Done( bdfface );
    return BDF_Err_Unknown_File_Format;
  }


  FT_CALLBACK_DEF( FT_Error )
  BDF_Size_Select( FT_Size   size,
                   FT_ULong  strike_index )
  {
    bdf_font_t*  bdffont = ( (BDF_Face)size->face )->bdffont;


    FT_Select_Metrics( size->face, strike_index );

    size->metrics.ascender    = bdffont->font_ascent << 6;
    size->metrics.descender   = -bdffont->font_descent << 6;
    size->metrics.max_advance = bdffont->bbx.width << 6;

    return BDF_Err_Ok;
  }


  FT_CALLBACK_DEF( FT_Error )
  BDF_Size_Request( FT_Size          size,
                    FT_Size_Request  req )
  {
    FT_Face          face    = size->face;
    FT_Bitmap_Size*  bsize   = face->available_sizes;
    bdf_font_t*      bdffont = ( (BDF_Face)face )->bdffont;
    FT_Error         error   = BDF_Err_Invalid_Pixel_Size;
    FT_Long          height;


    height = FT_REQUEST_HEIGHT( req );
    height = ( height + 32 ) >> 6;

    switch ( req->type )
    {
    case FT_SIZE_REQUEST_TYPE_NOMINAL:
      if ( height == ( bsize->y_ppem + 32 ) >> 6 )
        error = BDF_Err_Ok;
      break;

    case FT_SIZE_REQUEST_TYPE_REAL_DIM:
      if ( height == ( bdffont->font_ascent +
                       bdffont->font_descent ) )
        error = BDF_Err_Ok;
      break;

    default:
      error = BDF_Err_Unimplemented_Feature;
      break;
    }

    if ( error )
      return error;
    else
      return BDF_Size_Select( size, 0 );
  }



  FT_CALLBACK_DEF( FT_Error )
  BDF_Glyph_Load( FT_GlyphSlot  slot,
                  FT_Size       size,
                  FT_UInt       glyph_index,
                  FT_Int32      load_flags )
  {
    BDF_Face     bdf    = (BDF_Face)FT_SIZE_FACE( size );
    FT_Face      face   = FT_FACE( bdf );
    FT_Error     error  = BDF_Err_Ok;
    FT_Bitmap*   bitmap = &slot->bitmap;
    bdf_glyph_t  glyph;
    int          bpp    = bdf->bdffont->bpp;

    FT_UNUSED( load_flags );


    if ( !face || glyph_index >= (FT_UInt)face->num_glyphs )
    {
      error = BDF_Err_Invalid_Argument;
      goto Exit;
    }

    /* index 0 is the undefined glyph */
    if ( glyph_index == 0 )
      glyph_index = bdf->default_glyph;
    else
      glyph_index--;

    /* slot, bitmap => freetype, glyph => bdflib */
    glyph = bdf->bdffont->glyphs[glyph_index];

    bitmap->rows  = glyph.bbx.height;
    bitmap->width = glyph.bbx.width;
    bitmap->pitch = glyph.bpr;

    /* note: we don't allocate a new array to hold the bitmap; */
    /*       we can simply point to it                         */
    ft_glyphslot_set_bitmap( slot, glyph.bitmap );

    switch ( bpp )
    {
    case 1:
      bitmap->pixel_mode = FT_PIXEL_MODE_MONO;
      break;
    case 2:
      bitmap->pixel_mode = FT_PIXEL_MODE_GRAY2;
      break;
    case 4:
      bitmap->pixel_mode = FT_PIXEL_MODE_GRAY4;
      break;
    case 8:
      bitmap->pixel_mode = FT_PIXEL_MODE_GRAY;
      bitmap->num_grays  = 256;
      break;
    }

    slot->format      = FT_GLYPH_FORMAT_BITMAP;
    slot->bitmap_left = glyph.bbx.x_offset;
    slot->bitmap_top  = glyph.bbx.ascent;

    slot->metrics.horiAdvance  = glyph.dwidth << 6;
    slot->metrics.horiBearingX = glyph.bbx.x_offset << 6;
    slot->metrics.horiBearingY = glyph.bbx.ascent << 6;
    slot->metrics.width        = bitmap->width << 6;
    slot->metrics.height       = bitmap->rows << 6;

    /*
     * XXX DWIDTH1 and VVECTOR should be parsed and
     * used here, provided such fonts do exist.
     */
    ft_synthesize_vertical_metrics( &slot->metrics,
                                    bdf->bdffont->bbx.height << 6 );

  Exit:
    return error;
  }


 /*
  *
  *  BDF SERVICE
  *
  */

  static FT_Error
  bdf_get_bdf_property( BDF_Face          face,
                        const char*       prop_name,
                        BDF_PropertyRec  *aproperty )
  {
    bdf_property_t*  prop;


    FT_ASSERT( face && face->bdffont );

    prop = bdf_get_font_property( face->bdffont, prop_name );
    if ( prop )
    {
      switch ( prop->format )
      {
      case BDF_ATOM:
        aproperty->type   = BDF_PROPERTY_TYPE_ATOM;
        aproperty->u.atom = prop->value.atom;
        break;

      case BDF_INTEGER:
        aproperty->type      = BDF_PROPERTY_TYPE_INTEGER;
        aproperty->u.integer = prop->value.int32;
        break;

      case BDF_CARDINAL:
        aproperty->type       = BDF_PROPERTY_TYPE_CARDINAL;
        aproperty->u.cardinal = prop->value.card32;
        break;

      default:
        goto Fail;
      }
      return 0;
    }

  Fail:
    return BDF_Err_Invalid_Argument;
  }


  static FT_Error
  bdf_get_charset_id( BDF_Face      face,
                      const char*  *acharset_encoding,
                      const char*  *acharset_registry )
  {
    *acharset_encoding = face->charset_encoding;
    *acharset_registry = face->charset_registry;

    return 0;
  }


  static const FT_Service_BDFRec  bdf_service_bdf =
  {
    (FT_BDF_GetCharsetIdFunc)bdf_get_charset_id,
    (FT_BDF_GetPropertyFunc) bdf_get_bdf_property
  };


 /*
  *
  *  SERVICES LIST
  *
  */

  static const FT_ServiceDescRec  bdf_services[] =
  {
    { FT_SERVICE_ID_BDF,       &bdf_service_bdf },
    { FT_SERVICE_ID_XF86_NAME, FT_XF86_FORMAT_BDF },
    { NULL, NULL }
  };


  FT_CALLBACK_DEF( FT_Module_Interface )
  bdf_driver_requester( FT_Module    module,
                        const char*  name )
  {
    FT_UNUSED( module );

    return ft_service_list_lookup( bdf_services, name );
  }



  FT_CALLBACK_TABLE_DEF
  const FT_Driver_ClassRec  bdf_driver_class =
  {
    {
      FT_MODULE_FONT_DRIVER         |
      FT_MODULE_DRIVER_NO_OUTLINES,
      sizeof ( FT_DriverRec ),

      "bdf",
      0x10000L,
      0x20000L,

      0,

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

    sizeof ( BDF_FaceRec ),
    sizeof ( FT_SizeRec ),
    sizeof ( FT_GlyphSlotRec ),

    BDF_Face_Init,
    BDF_Face_Done,
    0,                          /* FT_Size_InitFunc */
    0,                          /* FT_Size_DoneFunc */
    0,                          /* FT_Slot_InitFunc */
    0,                          /* FT_Slot_DoneFunc */

#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
    ft_stub_set_char_sizes,
    ft_stub_set_pixel_sizes,
#endif
    BDF_Glyph_Load,

    0,                          /* FT_Face_GetKerningFunc   */
    0,                          /* FT_Face_AttachFunc       */
    0,                          /* FT_Face_GetAdvancesFunc  */

    BDF_Size_Request,
    BDF_Size_Select
  };


/* END */