ftmulti.c

freetype库的应用demo,里面包含freetype的很多实例

  Process_Event( grEvent*  event )
  {
    int  i, axis;


    switch ( event->key )
    {
    case grKeyEsc:            /* ESC or q */
    case grKEY( 'q' ):
      return 0;

    case grKeyF1:
    case grKEY( '?' ):
      Help();
      return 1;

    /* mode keys */

    case grKEY( 'a' ):
      antialias = !antialias;
      new_header = antialias ? (char *)"anti-aliasing is now on"
                             : (char *)"anti-aliasing is now off";
      return 1;

    case grKEY( 'b' ):
      use_sbits  = !use_sbits;
      new_header = use_sbits
                     ? (char *)"embedded bitmaps are now used if available"
                     : (char *)"embedded bitmaps are now ignored";
      return 1;

    case grKEY( 'n' ):
    case grKEY( 'p' ):
      return (int)event->key;

    case grKEY( 'l' ):
      low_prec = !low_prec;
      new_header = low_prec
                     ? (char *)"rendering precision is now forced to low"
                     : (char *)"rendering precision is now normal";
      break;

    case grKEY( 'h' ):
      hinted = !hinted;
      new_header = hinted ? (char *)"glyph hinting is now active"
                          : (char *)"glyph hinting is now ignored";
      break;

    case grKEY( ' ' ):
      render_mode ^= 1;
      new_header = render_mode ? (char *)"rendering all glyphs in font"
                               : (char *)"rendering test text string";
      break;

    /* MM related keys */

    case grKeyF3:
      i = -20;
      axis = 0;
      goto Do_Axis;

    case grKeyF4:
      i = 20;
      axis = 0;
      goto Do_Axis;

    case grKeyF5:
      i = -20;
      axis = 1;
      goto Do_Axis;

    case grKeyF6:
      i = 20;
      axis = 1;
      goto Do_Axis;

    case grKeyF7:
      i = -20;
      axis = 2;
      goto Do_Axis;

    case grKeyF8:
      i = 20;
      axis = 2;
      goto Do_Axis;

    /* scaling related keys */

    case grKeyPageUp:
      i = 10;
      goto Do_Scale;

    case grKeyPageDown:
      i = -10;
      goto Do_Scale;

    case grKeyUp:
      i = 1;
      goto Do_Scale;

    case grKeyDown:
      i = -1;
      goto Do_Scale;

    /* glyph index related keys */

    case grKeyLeft:
      i = -1;
      goto Do_Glyph;

    case grKeyRight:
      i = 1;
      goto Do_Glyph;

    case grKeyF9:
      i = -100;
      goto Do_Glyph;

    case grKeyF10:
      i = 100;
      goto Do_Glyph;

    case grKeyF11:
      i = -1000;
      goto Do_Glyph;

    case grKeyF12:
      i = 1000;
      goto Do_Glyph;

    default:
      ;
    }
    return 1;

  Do_Axis:
    if ( axis < (int)multimaster->num_axis )
    {
      FT_Var_Axis* a   = multimaster->axis + axis;
      FT_Fixed     pos = design_pos[axis];

      /* Normalize i. changing by 20 is all very well for PostScript fonts  */
      /*  which tend to have a range of ~1000 per axis, but it's not useful */
      /*  for mac fonts which have a range of ~3.                           */
      /* And it's rather extreme for optical size even in PS                */
      pos += FT_MulDiv( i, a->maximum-a->minimum, 1000 );
      if ( pos < a->minimum ) pos = a->minimum;
      if ( pos > a->maximum ) pos = a->maximum;

      design_pos[axis] = pos;

      FT_Set_Var_Design_Coordinates( face, multimaster->num_axis, design_pos );
    }
    return 1;

  Do_Scale:
    ptsize += i;
    if ( ptsize < 1 )         ptsize = 1;
    if ( ptsize > MAXPTSIZE ) ptsize = MAXPTSIZE;
    return 1;

  Do_Glyph:
    Num += i;
    if ( Num < 0 )           Num = 0;
    if ( Num >= num_glyphs ) Num = num_glyphs - 1;
    return 1;
  }


  static void
  usage( char*  execname )
  {
    fprintf( stderr,  "\n" );
    fprintf( stderr,  "ftmulti: multiple masters font viewer - part of FreeType\n" );
    fprintf( stderr,  "--------------------------------------------------------\n" );
    fprintf( stderr,  "\n" );
    fprintf( stderr,  "Usage: %s [options below] ppem fontname[.pfb|.ttf] ...\n",
             execname );
    fprintf( stderr,  "\n" );
    fprintf( stderr,  "  -e encoding  select encoding (default: no encoding)\n" );
    fprintf( stderr,  "  -r R         use resolution R dpi (default: 72 dpi)\n" );
    fprintf( stderr,  "  -f index     specify first glyph index to display\n" );
    fprintf( stderr,  "  -d \"axis1 axis2 ...\"\n"
                      "               specify the design coordinates for each axis\n" );
    fprintf( stderr,  "\n" );

    exit( 1 );
  }


  int
  main( int    argc,
        char*  argv[] )
  {
    int    old_ptsize, orig_ptsize, file;
    int    first_glyph = 0;
    int    XisSetup = 0;
    char*  execname;
    int    option;
    int    file_loaded;

    grEvent  event;


    execname = ft_basename( argv[0] );

    while ( 1 )
    {
      option = getopt( argc, argv, "d:e:f:r:" );

      if ( option == -1 )
        break;

      switch ( option )
      {
      case 'd':
        parse_design_coords( optarg );
        break;

      case 'e':
        encoding = (FT_Encoding)make_tag( optarg );
        break;

      case 'f':
        first_glyph = atoi( optarg );
        break;

      case 'r':
        res = atoi( optarg );
        if ( res < 1 )
          usage( execname );
        break;

      default:
        usage( execname );
        break;
      }
    }

    argc -= optind;
    argv += optind;

    if ( argc <= 1 )
      usage( execname );

    if ( sscanf( argv[0], "%d", &orig_ptsize ) != 1 )
      orig_ptsize = 64;

    file = 1;

    /* Initialize engine */
    error = FT_Init_FreeType( &library );
    if ( error )
      PanicZ( "Could not initialize FreeType library" );

  NewFile:
    ptsize      = orig_ptsize;
    hinted      = 1;
    file_loaded = 0;

    /* Load face */
    error = FT_New_Face( library, argv[file], 0, &face );
    if ( error )
      goto Display_Font;

    if ( encoding != FT_ENCODING_NONE )
    {
      error = FT_Select_Charmap( face, encoding );
      if ( error )
        goto Display_Font;
    }

    /* retrieve multiple master information */
    error = FT_Get_MM_Var( face, &multimaster );
    if ( error )
      goto Display_Font;

    /* if the user specified a position, use it, otherwise */
    /* set the current position to the median of each axis */
    {
      int  n;


      for ( n = 0; n < (int)multimaster->num_axis; n++ )
      {
        design_pos[n] = n < requested_cnt ? requested_pos[n]
                                          : multimaster->axis[n].def;
        if ( design_pos[n] < multimaster->axis[n].minimum )
          design_pos[n] = multimaster->axis[n].minimum;
        else if ( design_pos[n] > multimaster->axis[n].maximum )
          design_pos[n] = multimaster->axis[n].maximum;
      }
    }

    error = FT_Set_Var_Design_Coordinates( face,
                                           multimaster->num_axis,
                                           design_pos );
    if ( error )
      goto Display_Font;

    file_loaded++;

    Reset_Scale( ptsize );

    num_glyphs = face->num_glyphs;
    glyph      = face->glyph;
    size       = face->size;

  Display_Font:
    /* initialize graphics if needed */
    if ( !XisSetup )
    {
      XisSetup = 1;
      Init_Display();
    }

    grSetTitle( surface, "FreeType Glyph Viewer - press F1 for help" );
    old_ptsize = ptsize;

    if ( file_loaded >= 1 )
    {
      Fail = 0;
      Num  = first_glyph;

      if ( Num >= num_glyphs )
        Num = num_glyphs - 1;

      if ( Num < 0 )
        Num = 0;
    }

    for ( ;; )
    {
      int  key;


      Clear_Display();

      if ( file_loaded >= 1 )
      {
        switch ( render_mode )
        {
        case 0:
          Render_Text( Num );
          break;

        default:
          Render_All( Num, ptsize );
        }

        sprintf( Header, "%s %s (file %s)",
                         face->family_name,
                         face->style_name,
                         ft_basename( argv[file] ) );

        if ( !new_header )
          new_header = Header;

        grWriteCellString( &bit, 0, 0, new_header, fore_color );
        new_header = 0;

        sprintf( Header, "axis: " );
        {
          int  n;


          for ( n = 0; n < (int)multimaster->num_axis; n++ )
          {
            char  temp[32];


            sprintf( temp, "  %s:%g",
                           multimaster->axis[n].name,
                           design_pos[n]/65536. );
            strcat( Header, temp );
          }
        }
        grWriteCellString( &bit, 0, 16, Header, fore_color );

        sprintf( Header, "at %d points, first glyph = %d",
                         ptsize,
                         Num );
      }
      else
      {
        sprintf( Header, "%s: not an MM font file, or could not be opened",
                         ft_basename( argv[file] ) );
      }

      grWriteCellString( &bit, 0, 8, Header, fore_color );
      grRefreshSurface( surface );

      grListenSurface( surface, 0, &event );
      if ( !( key = Process_Event( &event ) ) )
        goto End;

      if ( key == 'n' )
      {
        if ( file_loaded >= 1 )
          FT_Done_Face( face );

        if ( file < argc - 1 )
          file++;

        goto NewFile;
      }

      if ( key == 'p' )
      {
        if ( file_loaded >= 1 )
          FT_Done_Face( face );

        if ( file > 1 )
          file--;

        goto NewFile;
      }

      if ( ptsize != old_ptsize )
      {
        Reset_Scale( ptsize );

        old_ptsize = ptsize;
      }
    }

  End:
#if 0
    grDoneSurface( surface );
    grDone();
#endif

    free            ( multimaster );
    FT_Done_Face    ( face        );
    FT_Done_FreeType( library     );

    printf( "Execution completed successfully.\n" );
    printf( "Fails = %d\n", Fail );

    exit( 0 );      /* for safety reasons */
    return 0;       /* never reached */
  }


/* End */