type1.c

ucgui的矢量字库支持包,可以象windows一样使用truetype的字库了

  /*                                                                       */
  /* Just a wrapper around T1_Get_Multi_Master to support the different    */
  /*  arguments needed by the GX var distortable fonts.                    */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  T1_Get_MM_Var( T1_Face      face,
                 FT_MM_Var*  *master )
  {
    FT_Memory        memory = face->root.memory;
    FT_MM_Var       *mmvar;
    FT_Multi_Master  mmaster;
    FT_Error         error;
    FT_UInt          i;
    FT_Fixed         axiscoords[T1_MAX_MM_AXIS];
    PS_Blend         blend = face->blend;


    error = T1_Get_Multi_Master( face, &mmaster );
    if ( error )
      goto Exit;
    if ( FT_ALLOC( mmvar,
                   sizeof ( FT_MM_Var ) +
                     mmaster.num_axis * sizeof ( FT_Var_Axis ) ) )
      goto Exit;

    mmvar->num_axis        = mmaster.num_axis;
    mmvar->num_designs     = mmaster.num_designs;
    mmvar->num_namedstyles = (FT_UInt)-1;                /* Does not apply */
    mmvar->axis            = (FT_Var_Axis*)&mmvar[1];
                                      /* Point to axes after MM_Var struct */
    mmvar->namedstyle      = NULL;

    for ( i = 0 ; i < mmaster.num_axis; ++i )
    {
      mmvar->axis[i].name    = mmaster.axis[i].name;
      mmvar->axis[i].minimum = FT_INT_TO_FIXED( mmaster.axis[i].minimum);
      mmvar->axis[i].maximum = FT_INT_TO_FIXED( mmaster.axis[i].maximum);
      mmvar->axis[i].def     = ( mmvar->axis[i].minimum +
                                   mmvar->axis[i].maximum ) / 2;
                            /* Does not apply.  But this value is in range */
      mmvar->axis[i].strid   = 0xFFFFFFFFUL;   /* Does not apply */
      mmvar->axis[i].tag     = 0xFFFFFFFFUL;   /* Does not apply */

      if ( ft_strcmp( mmvar->axis[i].name, "Weight" ) == 0 )
        mmvar->axis[i].tag = FT_MAKE_TAG( 'w', 'g', 'h', 't' );
      else if ( ft_strcmp( mmvar->axis[i].name, "Width" ) == 0 )
        mmvar->axis[i].tag = FT_MAKE_TAG( 'w', 'd', 't', 'h' );
      else if ( ft_strcmp( mmvar->axis[i].name, "OpticalSize" ) == 0 )
        mmvar->axis[i].tag = FT_MAKE_TAG( 'o', 'p', 's', 'z' );
    }

    if ( blend->num_designs == 1U << blend->num_axis )
    {
      mm_weights_unmap( blend->default_weight_vector,
                        axiscoords,
                        blend->num_axis );

      for ( i = 0; i < mmaster.num_axis; ++i )
        mmvar->axis[i].def = mm_axis_unmap( &blend->design_map[i],
                                            axiscoords[i] );
    }

    *master = mmvar;

  Exit:
    return error;
  }


  FT_LOCAL_DEF( FT_Error )
  T1_Set_MM_Blend( T1_Face    face,
                   FT_UInt    num_coords,
                   FT_Fixed*  coords )
  {
    PS_Blend  blend = face->blend;
    FT_Error  error;
    FT_UInt   n, m;


    error = T1_Err_Invalid_Argument;

    if ( blend && blend->num_axis == num_coords )
    {
      /* recompute the weight vector from the blend coordinates */
      error = T1_Err_Ok;

      for ( n = 0; n < blend->num_designs; n++ )
      {
        FT_Fixed  result = 0x10000L;  /* 1.0 fixed */


        for ( m = 0; m < blend->num_axis; m++ )
        {
          FT_Fixed  factor;


          /* get current blend axis position */
          factor = coords[m];
          if ( factor < 0 )        factor = 0;
          if ( factor > 0x10000L ) factor = 0x10000L;

          if ( ( n & ( 1 << m ) ) == 0 )
            factor = 0x10000L - factor;

          result = FT_MulFix( result, factor );
        }
        blend->weight_vector[n] = result;
      }

      error = T1_Err_Ok;
    }

    return error;
  }


  FT_LOCAL_DEF( FT_Error )
  T1_Set_MM_Design( T1_Face   face,
                    FT_UInt   num_coords,
                    FT_Long*  coords )
  {
    PS_Blend  blend = face->blend;
    FT_Error  error;
    FT_UInt   n, p;


    error = T1_Err_Invalid_Argument;
    if ( blend && blend->num_axis == num_coords )
    {
      /* compute the blend coordinates through the blend design map */
      FT_Fixed  final_blends[T1_MAX_MM_DESIGNS];


      for ( n = 0; n < blend->num_axis; n++ )
      {
        FT_Long       design  = coords[n];
        FT_Fixed      the_blend;
        PS_DesignMap  map     = blend->design_map + n;
        FT_Long*      designs = map->design_points;
        FT_Fixed*     blends  = map->blend_points;
        FT_Int        before  = -1, after = -1;


        for ( p = 0; p < (FT_UInt)map->num_points; p++ )
        {
          FT_Long  p_design = designs[p];


          /* exact match? */
          if ( design == p_design )
          {
            the_blend = blends[p];
            goto Found;
          }

          if ( design < p_design )
          {
            after = p;
            break;
          }

          before = p;
        }

        /* now interpolate if necessary */
        if ( before < 0 )
          the_blend = blends[0];

        else if ( after < 0 )
          the_blend = blends[map->num_points - 1];

        else
          the_blend = FT_MulDiv( design         - designs[before],
                                 blends [after] - blends [before],
                                 designs[after] - designs[before] );

      Found:
        final_blends[n] = the_blend;
      }

      error = T1_Set_MM_Blend( face, num_coords, final_blends );
    }

    return error;
  }


  /*************************************************************************/
  /*                                                                       */
  /* Just a wrapper around T1_Set_MM_Design to support the different       */
  /* arguments needed by the GX var distortable fonts.                     */
  /*                                                                       */
  FT_LOCAL_DEF( FT_Error )
  T1_Set_Var_Design( T1_Face    face,
                     FT_UInt    num_coords,
                     FT_Fixed*  coords )
  {
     FT_Long   lcoords[4];          /* maximum axis count is 4 */
     FT_UInt   i;
     FT_Error  error;


     error = T1_Err_Invalid_Argument;
     if ( num_coords <= 4 && num_coords > 0 )
     {
       for ( i = 0; i < num_coords; ++i )
         lcoords[i] = FT_FIXED_TO_INT( coords[i] );
       error = T1_Set_MM_Design( face, num_coords, lcoords );
     }

     return error;
  }


  FT_LOCAL_DEF( void )
  T1_Done_Blend( T1_Face  face )
  {
    FT_Memory  memory = face->root.memory;
    PS_Blend   blend  = face->blend;


    if ( blend )
    {
      FT_UInt  num_designs = blend->num_designs;
      FT_UInt  num_axis    = blend->num_axis;
      FT_UInt  n;


      /* release design pos table */
      FT_FREE( blend->design_pos[0] );
      for ( n = 1; n < num_designs; n++ )
        blend->design_pos[n] = 0;

      /* release blend `private' and `font info' dictionaries */
      FT_FREE( blend->privates[1] );
      FT_FREE( blend->font_infos[1] );
      FT_FREE( blend->bboxes[1] );

      for ( n = 0; n < num_designs; n++ )
      {
        blend->privates  [n] = 0;
        blend->font_infos[n] = 0;
        blend->bboxes    [n] = 0;
      }

      /* release weight vectors */
      FT_FREE( blend->weight_vector );
      blend->default_weight_vector = 0;

      /* release axis names */
      for ( n = 0; n < num_axis; n++ )
        FT_FREE( blend->axis_names[n] );

      /* release design map */
      for ( n = 0; n < num_axis; n++ )
      {
        PS_DesignMap  dmap = blend->design_map + n;


        FT_FREE( dmap->design_points );
        dmap->num_points = 0;
      }

      FT_FREE( face->blend );
    }
  }


  static void
  parse_blend_axis_types( T1_Face    face,
                          T1_Loader  loader )
  {
    T1_TokenRec  axis_tokens[T1_MAX_MM_AXIS];
    FT_Int       n, num_axis;
    FT_Error     error = T1_Err_Ok;
    PS_Blend     blend;
    FT_Memory    memory;


    /* take an array of objects */
    T1_ToTokenArray( &loader->parser, axis_tokens,
                     T1_MAX_MM_AXIS, &num_axis );
    if ( num_axis < 0 )
    {
      error = T1_Err_Ignore;
      goto Exit;
    }
    if ( num_axis == 0 || num_axis > T1_MAX_MM_AXIS )
    {
      FT_ERROR(( "parse_blend_axis_types: incorrect number of axes: %d\n",
                 num_axis ));
      error = T1_Err_Invalid_File_Format;
      goto Exit;
    }

    /* allocate blend if necessary */
    error = t1_allocate_blend( face, 0, (FT_UInt)num_axis );
    if ( error )
      goto Exit;

    blend  = face->blend;
    memory = face->root.memory;

    /* each token is an immediate containing the name of the axis */
    for ( n = 0; n < num_axis; n++ )
    {
      T1_Token    token = axis_tokens + n;
      FT_Byte*    name;
      FT_PtrDist  len;


      /* skip first slash, if any */
      if ( token->start[0] == '/' )
        token->start++;

      len = token->limit - token->start;
      if ( len == 0 )
      {
        error = T1_Err_Invalid_File_Format;
        goto Exit;
      }

      if ( FT_ALLOC( blend->axis_names[n], len + 1 ) )
        goto Exit;

      name = (FT_Byte*)blend->axis_names[n];
      FT_MEM_COPY( name, token->start, len );
      name[len] = 0;
    }

  Exit:
    loader->parser.root.error = error;
  }


  static void
  parse_blend_design_positions( T1_Face    face,
                                T1_Loader  loader )
  {
    T1_TokenRec  design_tokens[T1_MAX_MM_DESIGNS];
    FT_Int       num_designs;
    FT_Int       num_axis;
    T1_Parser    parser = &loader->parser;

    FT_Error     error = T1_Err_Ok;
    PS_Blend     blend;


    /* get the array of design tokens -- compute number of designs */
    T1_ToTokenArray( parser, design_tokens,
                     T1_MAX_MM_DESIGNS, &num_designs );
    if ( num_designs < 0 )
    {
      error = T1_Err_Ignore;
      goto Exit;
    }
    if ( num_designs == 0 || num_designs > T1_MAX_MM_DESIGNS )
    {
      FT_ERROR(( "parse_blend_design_positions:" ));
      FT_ERROR(( " incorrect number of designs: %d\n",
                 num_designs ));
      error = T1_Err_Invalid_File_Format;
      goto Exit;
    }

    {
      FT_Byte*  old_cursor = parser->root.cursor;
      FT_Byte*  old_limit  = parser->root.limit;
      FT_Int    n;


      blend    = face->blend;
      num_axis = 0;  /* make compiler happy */

      for ( n = 0; n < num_designs; n++ )
      {
        T1_TokenRec  axis_tokens[T1_MAX_MM_DESIGNS];
        T1_Token     token;
        FT_Int       axis, n_axis;


        /* read axis/coordinates tokens */
        token = design_tokens + n;
        parser->root.cursor = token->start;
        parser->root.limit  = token->limit;
        T1_ToTokenArray( parser, axis_tokens, T1_MAX_MM_AXIS, &n_axis );

        if ( n == 0 )
        {
          num_axis = n_axis;
          error = t1_allocate_blend( face, num_designs, num_axis );
          if ( error )
            goto Exit;
          blend = face->blend;
        }
        else if ( n_axis != num_axis )
        {
          FT_ERROR(( "parse_blend_design_positions: incorrect table\n" ));
          error = T1_Err_Invalid_File_Format;