pcfread.c

qt-x11-opensource-src-4.1.4.tar.gz源码

  static
  const FT_Frame_Field  pcf_accel_msb_header[] =
  {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  PCF_AccelRec

    FT_FRAME_START( 20 ),
      FT_FRAME_BYTE      ( noOverlap ),
      FT_FRAME_BYTE      ( constantMetrics ),
      FT_FRAME_BYTE      ( terminalFont ),
      FT_FRAME_BYTE      ( constantWidth ),
      FT_FRAME_BYTE      ( inkInside ),
      FT_FRAME_BYTE      ( inkMetrics ),
      FT_FRAME_BYTE      ( drawDirection ),
      FT_FRAME_SKIP_BYTES( 1 ),
      FT_FRAME_LONG      ( fontAscent ),
      FT_FRAME_LONG      ( fontDescent ),
      FT_FRAME_LONG      ( maxOverlap ),
    FT_FRAME_END
  };


  static FT_Error
  pcf_get_accel( FT_Stream  stream,
                 PCF_Face   face,
                 FT_ULong   type )
  {
    FT_ULong   format, size;
    FT_Error   error = PCF_Err_Ok;
    PCF_Accel  accel = &face->accel;


    error = pcf_seek_to_table_type( stream,
                                    face->toc.tables,
                                    face->toc.count,
                                    type,
                                    &format,
                                    &size );
    if ( error )
      goto Bail;

    error = FT_READ_ULONG_LE( format );

    if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT )    &&
         !PCF_FORMAT_MATCH( format, PCF_ACCEL_W_INKBOUNDS ) )
      goto Bail;

    if ( PCF_BYTE_ORDER( format ) == MSBFirst )
    {
      if ( FT_STREAM_READ_FIELDS( pcf_accel_msb_header, accel ) )
        goto Bail;
    }
    else
    {
      if ( FT_STREAM_READ_FIELDS( pcf_accel_header, accel ) )
        goto Bail;
    }

    error = pcf_get_metric( stream,
                            format & ( ~PCF_FORMAT_MASK ),
                            &(accel->minbounds) );
    if ( error )
      goto Bail;

    error = pcf_get_metric( stream,
                            format & ( ~PCF_FORMAT_MASK ),
                            &(accel->maxbounds) );
    if ( error )
      goto Bail;

    if ( PCF_FORMAT_MATCH( format, PCF_ACCEL_W_INKBOUNDS ) )
    {
      error = pcf_get_metric( stream,
                              format & ( ~PCF_FORMAT_MASK ),
                              &(accel->ink_minbounds) );
      if ( error )
        goto Bail;

      error = pcf_get_metric( stream,
                              format & ( ~PCF_FORMAT_MASK ),
                              &(accel->ink_maxbounds) );
      if ( error )
        goto Bail;
    }
    else
    {
      accel->ink_minbounds = accel->minbounds; /* I'm not sure about this */
      accel->ink_maxbounds = accel->maxbounds;
    }
    return error;

  Bail:
    return error;
  }


  static FT_Error
  pcf_interpret_style( PCF_Face  pcf )
  {
    FT_Error   error  = PCF_Err_Ok;
    FT_Face    face   = FT_FACE( pcf );
    FT_Memory  memory = face->memory;

    PCF_Property  prop;

    char  *istr = NULL, *bstr = NULL;
    char  *sstr = NULL, *astr = NULL;

    int  parts = 0, len = 0;


    face->style_flags = 0;

    prop = pcf_find_property( pcf, "SLANT" );
    if ( prop && prop->isString                                       &&
         ( *(prop->value.atom) == 'O' || *(prop->value.atom) == 'o' ||
           *(prop->value.atom) == 'I' || *(prop->value.atom) == 'i' ) )
    {
      face->style_flags |= FT_STYLE_FLAG_ITALIC;
      istr = ( *(prop->value.atom) == 'O' || *(prop->value.atom) == 'o' )
               ? (char *)"Oblique"
               : (char *)"Italic";
      len += ft_strlen( istr );
      parts++;
    }

    prop = pcf_find_property( pcf, "WEIGHT_NAME" );
    if ( prop && prop->isString                                       &&
         ( *(prop->value.atom) == 'B' || *(prop->value.atom) == 'b' ) )
    {
      face->style_flags |= FT_STYLE_FLAG_BOLD;
      bstr = (char *)"Bold";
      len += ft_strlen( bstr );
      parts++;
    }

    prop = pcf_find_property( pcf, "SETWIDTH_NAME" );
    if ( prop && prop->isString                                        &&
         *(prop->value.atom)                                           &&
         !( *(prop->value.atom) == 'N' || *(prop->value.atom) == 'n' ) )
    {
      sstr = (char *)(prop->value.atom);
      len += ft_strlen( sstr );
      parts++;
    }

    prop = pcf_find_property( pcf, "ADD_STYLE_NAME" );
    if ( prop && prop->isString                                        &&
         *(prop->value.atom)                                           &&
         !( *(prop->value.atom) == 'N' || *(prop->value.atom) == 'n' ) )
    {
      astr = (char *)(prop->value.atom);
      len += ft_strlen( astr );
      parts++;
    }

    if ( !parts || !len )
    {
      if ( FT_ALLOC( face->style_name, 8 ) )
        return error;
      ft_strcpy( face->style_name, "Regular" );
      face->style_name[7] = '\0';
    }
    else
    {
      char          *style, *s;
      unsigned int  i;


      if ( FT_ALLOC( style, len + parts ) )
        return error;

      s = style;

      if ( astr )
      {
        ft_strcpy( s, astr );
        for ( i = 0; i < ft_strlen( astr ); i++, s++ )
          if ( *s == ' ' )
            *s = '-';                     /* replace spaces with dashes */
        *(s++) = ' ';
      }
      if ( bstr )
      {
        ft_strcpy( s, bstr );
        s += ft_strlen( bstr );
        *(s++) = ' ';
      }
      if ( istr )
      {
        ft_strcpy( s, istr );
        s += ft_strlen( istr );
        *(s++) = ' ';
      }
      if ( sstr )
      {
        ft_strcpy( s, sstr );
        for ( i = 0; i < ft_strlen( sstr ); i++, s++ )
          if ( *s == ' ' )
            *s = '-';                     /* replace spaces with dashes */
        *(s++) = ' ';
      }
      *(--s) = '\0';        /* overwrite last ' ', terminate the string */

      face->style_name = style;                     /* allocated string */
    }

    return error;
  }


  FT_LOCAL_DEF( FT_Error )
  pcf_load_font( FT_Stream  stream,
                 PCF_Face   face )
  {
    FT_Error   error  = PCF_Err_Ok;
    FT_Memory  memory = FT_FACE(face)->memory;
    FT_Bool    hasBDFAccelerators;


    error = pcf_read_TOC( stream, face );
    if ( error )
      goto Exit;

    error = pcf_get_properties( stream, face );
    if ( error )
      goto Exit;

    /* Use the old accelerators if no BDF accelerators are in the file. */
    hasBDFAccelerators = pcf_has_table_type( face->toc.tables,
                                             face->toc.count,
                                             PCF_BDF_ACCELERATORS );
    if ( !hasBDFAccelerators )
    {
      error = pcf_get_accel( stream, face, PCF_ACCELERATORS );
      if ( error )
        goto Exit;
    }

    /* metrics */
    error = pcf_get_metrics( stream, face );
    if ( error )
      goto Exit;

    /* bitmaps */
    error = pcf_get_bitmaps( stream, face );
    if ( error )
      goto Exit;

    /* encodings */
    error = pcf_get_encodings( stream, face );
    if ( error )
      goto Exit;

    /* BDF style accelerators (i.e. bounds based on encoded glyphs) */
    if ( hasBDFAccelerators )
    {
      error = pcf_get_accel( stream, face, PCF_BDF_ACCELERATORS );
      if ( error )
        goto Exit;
    }

    /* XXX: TO DO: inkmetrics and glyph_names are missing */

    /* now construct the face object */
    {
      FT_Face       root = FT_FACE( face );
      PCF_Property  prop;


      root->num_faces  = 1;
      root->face_index = 0;
      root->face_flags = FT_FACE_FLAG_FIXED_SIZES |
                         FT_FACE_FLAG_HORIZONTAL  |
                         FT_FACE_FLAG_FAST_GLYPHS;

      if ( face->accel.constantWidth )
        root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;

      if ( ( error = pcf_interpret_style( face ) ) != 0 )
         goto Exit;

      prop = pcf_find_property( face, "FAMILY_NAME" );
      if ( prop && prop->isString )
      {
        int  l = ft_strlen( prop->value.atom ) + 1;


        if ( FT_NEW_ARRAY( root->family_name, l ) )
          goto Exit;
        ft_strcpy( root->family_name, prop->value.atom );
      }
      else
        root->family_name = NULL;

      /* Note: We shift all glyph indices by +1 since we must
       * respect the convention that glyph 0 always corresponds
       * to the "missing glyph".
       *
       * This implies bumping the number of "available" glyphs by 1.
       */
      root->num_glyphs = face->nmetrics + 1;

      root->num_fixed_sizes = 1;
      if ( FT_NEW_ARRAY( root->available_sizes, 1 ) )
        goto Exit;

      {
        FT_Bitmap_Size*  bsize = root->available_sizes;
        FT_Short         resolution_x = 0, resolution_y = 0;


        FT_MEM_ZERO( bsize, sizeof ( FT_Bitmap_Size ) );

        bsize->height = (FT_Short)( face->accel.fontAscent +
                                    face->accel.fontDescent );

        prop = pcf_find_property( face, "AVERAGE_WIDTH" );
        if ( prop )
          bsize->width = (FT_Short)( ( prop->value.integer + 5 ) / 10 );
        else
          bsize->width = (FT_Short)( bsize->height * 2/3 );

        prop = pcf_find_property( face, "POINT_SIZE" );
        if ( prop )
          /* convert from 722.7 decipoints to 72 points per inch */
          bsize->size =
            (FT_Pos)( ( prop->value.integer * 64 * 7200 + 36135L ) / 72270L );

        prop = pcf_find_property( face, "PIXEL_SIZE" );
        if ( prop )
          bsize->y_ppem = (FT_Short)prop->value.integer << 6;

        prop = pcf_find_property( face, "RESOLUTION_X" );
        if ( prop )
          resolution_x = (FT_Short)prop->value.integer;

        prop = pcf_find_property( face, "RESOLUTION_Y" );
        if ( prop )
          resolution_y = (FT_Short)prop->value.integer;

        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;
      }

      /* set up charset */
      {
        PCF_Property  charset_registry = 0, charset_encoding = 0;


        charset_registry = pcf_find_property( face, "CHARSET_REGISTRY" );
        charset_encoding = pcf_find_property( face, "CHARSET_ENCODING" );

        if ( charset_registry && charset_registry->isString &&
             charset_encoding && charset_encoding->isString )
        {
          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 );
        }
      }
    }

  Exit:
    if ( error )
    {
      /* this is done to respect the behaviour of the original */
      /* PCF font driver.                                      */
      error = PCF_Err_Invalid_File_Format;
    }

    return error;
  }


/* END */