pcfdrivr.c

一个类似windows

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

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

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

  Exit:
    return error;

  Fail:
    FT_TRACE2(( "[not a valid PCF file]\n" ));
    error = PCF_Err_Unknown_File_Format;  /* error */
    goto Exit;
  }


  FT_CALLBACK_DEF( FT_Error )
  PCF_Set_Pixel_Size( FT_Size  size,
                      FT_UInt  pixel_width,
                      FT_UInt  pixel_height )
  {
    PCF_Face  face = (PCF_Face)FT_SIZE_FACE( size );

    FT_UNUSED( pixel_width );


    if ( pixel_height == (FT_UInt)face->root.available_sizes->height )
    {
      size->metrics.ascender    = face->accel.fontAscent << 6;
      size->metrics.descender   = face->accel.fontDescent * (-64);
#if 0
      size->metrics.height      = face->accel.maxbounds.ascent << 6;
#endif
      size->metrics.height      = size->metrics.ascender -
                                  size->metrics.descender;

      size->metrics.max_advance = face->accel.maxbounds.characterWidth << 6;

      return PCF_Err_Ok;
    }
    else
    {
      FT_TRACE4(( "pixel size WRONG\n" ));
      return PCF_Err_Invalid_Pixel_Size;
    }
  }


  FT_CALLBACK_DEF( FT_Error )
  PCF_Set_Point_Size( FT_Size     size,
                      FT_F26Dot6  char_width,
                      FT_F26Dot6  char_height,
                      FT_UInt     horz_resolution,
                      FT_UInt     vert_resolution )
  {
    PCF_Face  face = (PCF_Face)FT_SIZE_FACE( size );

    FT_UNUSED( char_width );
    FT_UNUSED( char_height );
    FT_UNUSED( horz_resolution );
    FT_UNUSED( vert_resolution );


    FT_TRACE4(( "rec %d - pres %d\n",
                size->metrics.y_ppem,
                face->root.available_sizes->y_ppem >> 6 ));

    if ( size->metrics.y_ppem == face->root.available_sizes->y_ppem >> 6 )
    {
      size->metrics.ascender    = face->accel.fontAscent << 6;
      size->metrics.descender   = face->accel.fontDescent * (-64);
#if 0
      size->metrics.height      = face->accel.maxbounds.ascent << 6;
#endif
      size->metrics.height      = size->metrics.ascender -
                                  size->metrics.descender;

      size->metrics.max_advance = face->accel.maxbounds.characterWidth << 6;

      return PCF_Err_Ok;
    }
    else
    {
      FT_TRACE4(( "size WRONG\n" ));
      return PCF_Err_Invalid_Pixel_Size;
    }
  }


  FT_CALLBACK_DEF( FT_Error )
  PCF_Glyph_Load( FT_GlyphSlot  slot,
                  FT_Size       size,
                  FT_UInt       glyph_index,
                  FT_Int32      load_flags )
  {
    PCF_Face    face   = (PCF_Face)FT_SIZE_FACE( size );
    FT_Stream   stream = face->root.stream;
    FT_Error    error  = PCF_Err_Ok;
    FT_Bitmap*  bitmap = &slot->bitmap;
    PCF_Metric  metric;
    int         bytes;

    FT_UNUSED( load_flags );


    FT_TRACE4(( "load_glyph %d ---", glyph_index ));

    if ( !face )
    {
      error = PCF_Err_Invalid_Argument;
      goto Exit;
    }

    if ( glyph_index > 0 )
      glyph_index--;

    metric = face->metrics + glyph_index;

    bitmap->rows       = metric->ascent + metric->descent;
    bitmap->width      = metric->rightSideBearing - metric->leftSideBearing;
    bitmap->num_grays  = 1;
    bitmap->pixel_mode = FT_PIXEL_MODE_MONO;

    FT_TRACE6(( "BIT_ORDER %d ; BYTE_ORDER %d ; GLYPH_PAD %d\n",
                  PCF_BIT_ORDER( face->bitmapsFormat ),
                  PCF_BYTE_ORDER( face->bitmapsFormat ),
                  PCF_GLYPH_PAD( face->bitmapsFormat ) ));

    switch ( PCF_GLYPH_PAD( face->bitmapsFormat ) )
    {
    case 1:
      bitmap->pitch = ( bitmap->width + 7 ) >> 3;
      break;

    case 2:
      bitmap->pitch = ( ( bitmap->width + 15 ) >> 4 ) << 1;
      break;

    case 4:
      bitmap->pitch = ( ( bitmap->width + 31 ) >> 5 ) << 2;
      break;

    case 8:
      bitmap->pitch = ( ( bitmap->width + 63 ) >> 6 ) << 3;
      break;

    default:
      return PCF_Err_Invalid_File_Format;
    }

    /* XXX: to do: are there cases that need repadding the bitmap? */
    bytes = bitmap->pitch * bitmap->rows;

    error = ft_glyphslot_alloc_bitmap( slot, bytes );
    if ( error )
      goto Exit;

    if ( FT_STREAM_SEEK( metric->bits )          ||
         FT_STREAM_READ( bitmap->buffer, bytes ) )
      goto Exit;

    if ( PCF_BIT_ORDER( face->bitmapsFormat ) != MSBFirst )
      BitOrderInvert( bitmap->buffer, bytes );

    if ( ( PCF_BYTE_ORDER( face->bitmapsFormat ) !=
           PCF_BIT_ORDER( face->bitmapsFormat )  ) )
    {
      switch ( PCF_SCAN_UNIT( face->bitmapsFormat ) )
      {
      case 1:
        break;

      case 2:
        TwoByteSwap( bitmap->buffer, bytes );
        break;

      case 4:
        FourByteSwap( bitmap->buffer, bytes );
        break;
      }
    }

    slot->bitmap_left = metric->leftSideBearing;
    slot->bitmap_top  = metric->ascent;

    slot->metrics.horiAdvance  = metric->characterWidth << 6;
    slot->metrics.horiBearingX = metric->leftSideBearing << 6;
    slot->metrics.horiBearingY = metric->ascent << 6;
    slot->metrics.width        = ( metric->rightSideBearing -
                                   metric->leftSideBearing ) << 6;
    slot->metrics.height       = bitmap->rows << 6;

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

    FT_TRACE4(( " --- ok\n" ));

  Exit:
    return error;
  }


 /*
  *
  *  BDF SERVICE
  *
  */

  static FT_Error
  pcf_get_bdf_property( PCF_Face          face,
                        const char*       prop_name,
                        BDF_PropertyRec  *aproperty )
  {
    PCF_Property  prop;


    prop = pcf_find_property( face, prop_name );
    if ( prop != NULL )
    {
      if ( prop->isString )
      {
        aproperty->type   = BDF_PROPERTY_TYPE_ATOM;
        aproperty->u.atom = prop->value.atom;
      }
      else
      {
        /* Apparently, the PCF driver loads all properties as signed integers!
         * This really doesn't seem to be a problem, because this is
         * sufficient for any meaningful values.
         */
        aproperty->type      = BDF_PROPERTY_TYPE_INTEGER;
        aproperty->u.integer = prop->value.integer;
      }
      return 0;
    }

    return PCF_Err_Invalid_Argument;
  }


  static FT_Error
  pcf_get_charset_id( PCF_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  pcf_service_bdf =
  {
    (FT_BDF_GetCharsetIdFunc)pcf_get_charset_id,
    (FT_BDF_GetPropertyFunc) pcf_get_bdf_property
  };


 /*
  *
  *  SERVICE LIST
  *
  */

  static const FT_ServiceDescRec  pcf_services[] =
  {
    { FT_SERVICE_ID_BDF,       &pcf_service_bdf },
    { FT_SERVICE_ID_XF86_NAME, FT_XF86_FORMAT_PCF },
    { NULL, NULL }
  };


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

    return ft_service_list_lookup( pcf_services, name );
  }


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

      "pcf",
      0x10000L,
      0x20000L,

      0,

      0,
      0,
      pcf_driver_requester
    },

    sizeof ( PCF_FaceRec ),
    sizeof ( FT_SizeRec ),
    sizeof ( FT_GlyphSlotRec ),

    PCF_Face_Init,
    PCF_Face_Done,
    0,                      /* FT_Size_InitFunc */
    0,                      /* FT_Size_DoneFunc */
    0,                      /* FT_Slot_InitFunc */
    0,                      /* FT_Slot_DoneFunc */

    PCF_Set_Point_Size,
    PCF_Set_Pixel_Size,

    PCF_Glyph_Load,

    0,                      /* FT_Face_GetKerningFunc  */
    0,                      /* FT_Face_AttachFunc      */
    0                       /* FT_Face_GetAdvancesFunc */
  };


/* END */