ftobjs.c

奇趣公司比较新的qt/emd版本

        if ( bsize->y_ppem < 0 )
          bsize->y_ppem = -bsize->y_ppem;
      }
    }

    /* initialize internal face data */
    {
      FT_Face_Internal  internal = face->internal;


      internal->transform_matrix.xx = 0x10000L;
      internal->transform_matrix.xy = 0;
      internal->transform_matrix.yx = 0;
      internal->transform_matrix.yy = 0x10000L;

      internal->transform_delta.x = 0;
      internal->transform_delta.y = 0;
    }

    if ( aface )
      *aface = face;
    else
      FT_Done_Face( face );

    goto Exit;

  Fail:
    FT_Done_Face( face );

  Exit:
    FT_TRACE4(( "FT_Open_Face: Return %d\n", error ));

    return error;
  }


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Attach_File( FT_Face      face,
                  const char*  filepathname )
  {
    FT_Open_Args  open;


    /* test for valid `face' delayed to FT_Attach_Stream() */

    if ( !filepathname )
      return FT_Err_Invalid_Argument;

    open.stream   = NULL;
    open.flags    = FT_OPEN_PATHNAME;
    open.pathname = (char*)filepathname;

    return FT_Attach_Stream( face, &open );
  }


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Attach_Stream( FT_Face        face,
                    FT_Open_Args*  parameters )
  {
    FT_Stream  stream;
    FT_Error   error;
    FT_Driver  driver;

    FT_Driver_Class  clazz;


    /* test for valid `parameters' delayed to FT_Stream_New() */

    if ( !face )
      return FT_Err_Invalid_Face_Handle;

    driver = face->driver;
    if ( !driver )
      return FT_Err_Invalid_Driver_Handle;

    error = FT_Stream_New( driver->root.library, parameters, &stream );
    if ( error )
      goto Exit;

    /* we implement FT_Attach_Stream in each driver through the */
    /* `attach_file' interface                                  */

    error = FT_Err_Unimplemented_Feature;
    clazz = driver->clazz;
    if ( clazz->attach_file )
      error = clazz->attach_file( face, stream );

    /* close the attached stream */
    FT_Stream_Free( stream,
                    (FT_Bool)( parameters->stream &&
                               ( parameters->flags & FT_OPEN_STREAM ) ) );

  Exit:
    return error;
  }


  /* documentation is in freetype.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Done_Face( FT_Face  face )
  {
    FT_Error     error;
    FT_Driver    driver;
    FT_Memory    memory;
    FT_ListNode  node;


    error = FT_Err_Invalid_Face_Handle;
    if ( face && face->driver )
    {
      driver = face->driver;
      memory = driver->root.memory;

      /* find face in driver's list */
      node = FT_List_Find( &driver->faces_list, face );
      if ( node )
      {
        /* remove face object from the driver's list */
        FT_List_Remove( &driver->faces_list, node );
        FT_FREE( node );

        /* now destroy the object proper */
        destroy_face( memory, face, driver );
        error = FT_Err_Ok;
      }
    }
    return error;
  }


  /* documentation is in ftobjs.h */

  FT_EXPORT_DEF( FT_Error )
  FT_New_Size( FT_Face   face,
               FT_Size  *asize )
  {
    FT_Error         error;
    FT_Memory        memory;
    FT_Driver        driver;
    FT_Driver_Class  clazz;

    FT_Size          size = 0;
    FT_ListNode      node = 0;


    if ( !face )
      return FT_Err_Invalid_Face_Handle;

    if ( !asize )
      return FT_Err_Invalid_Size_Handle;

    if ( !face->driver )
      return FT_Err_Invalid_Driver_Handle;

    *asize = 0;

    driver = face->driver;
    clazz  = driver->clazz;
    memory = face->memory;

    /* Allocate new size object and perform basic initialisation */
    if ( FT_ALLOC( size, clazz->size_object_size ) || FT_NEW( node ) )
      goto Exit;

    size->face = face;

    /* for now, do not use any internal fields in size objects */
    size->internal = 0;

    if ( clazz->init_size )
      error = clazz->init_size( size );

    /* in case of success, add to the face's list */
    if ( !error )
    {
      *asize     = size;
      node->data = size;
      FT_List_Add( &face->sizes_list, node );
    }

  Exit:
    if ( error )
    {
      FT_FREE( node );
      FT_FREE( size );
    }

    return error;
  }


  /* documentation is in ftobjs.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Done_Size( FT_Size  size )
  {
    FT_Error     error;
    FT_Driver    driver;
    FT_Memory    memory;
    FT_Face      face;
    FT_ListNode  node;


    if ( !size )
      return FT_Err_Invalid_Size_Handle;

    face = size->face;
    if ( !face )
      return FT_Err_Invalid_Face_Handle;

    driver = face->driver;
    if ( !driver )
      return FT_Err_Invalid_Driver_Handle;

    memory = driver->root.memory;

    error = FT_Err_Ok;
    node  = FT_List_Find( &face->sizes_list, size );
    if ( node )
    {
      FT_List_Remove( &face->sizes_list, node );
      FT_FREE( node );

      if ( face->size == size )
      {
        face->size = 0;
        if ( face->sizes_list.head )
          face->size = (FT_Size)(face->sizes_list.head->data);
      }

      destroy_size( memory, size, driver );
    }
    else
      error = FT_Err_Invalid_Size_Handle;

    return error;
  }


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( FT_Error )
  FT_Match_Size( FT_Face          face,
                 FT_Size_Request  req,
                 FT_Bool          ignore_width,
                 FT_ULong*        size_index )
  {
    FT_Int   i;
    FT_Long  w, h;


    if ( !FT_HAS_FIXED_SIZES( face ) )
      return FT_Err_Invalid_Face_Handle;

    /* FT_Bitmap_Size doesn't provide enough info... */
    if ( req->type != FT_SIZE_REQUEST_TYPE_NOMINAL )
      return FT_Err_Unimplemented_Feature;

    w = FT_REQUEST_WIDTH ( req );
    h = FT_REQUEST_HEIGHT( req );

    if ( req->width && !req->height )
      h = w;
    else if ( !req->width && req->height )
      w = h;

    w = FT_PIX_ROUND( w );
    h = FT_PIX_ROUND( h );

    for ( i = 0; i < face->num_fixed_sizes; i++ )
    {
      FT_Bitmap_Size*  bsize = face->available_sizes + i;


      if ( h != FT_PIX_ROUND( bsize->y_ppem ) )
        continue;

      if ( w == FT_PIX_ROUND( bsize->x_ppem ) || ignore_width )
      {
        if ( size_index )
          *size_index = (FT_ULong)i;

        return FT_Err_Ok;
      }
    }

    return FT_Err_Invalid_Pixel_Size;
  }


  /* documentation is in ftobjs.h */

  FT_BASE_DEF( void )
  ft_synthesize_vertical_metrics( FT_Glyph_Metrics*  metrics,
                                  FT_Pos             advance )
  {
    /* the factor 1.2 is a heuristical value */
    if ( !advance )
      advance = metrics->height * 12 / 10;

    metrics->vertBearingX = -( metrics->width / 2 );
    metrics->vertBearingY = ( advance - metrics->height ) / 2;
    metrics->vertAdvance  = advance;
  }


  static void
  ft_recompute_scaled_metrics( FT_Face           face,
                               FT_Size_Metrics*  metrics )
  {
    /* Compute root ascender, descender, test height, and max_advance */

#ifdef GRID_FIT_METRICS
    metrics->ascender    = FT_PIX_CEIL( FT_MulFix( face->ascender,
                                                   metrics->y_scale ) );

    metrics->descender   = FT_PIX_FLOOR( FT_MulFix( face->descender,
                                                    metrics->y_scale ) );

    metrics->height      = FT_PIX_ROUND( FT_MulFix( face->height,
                                                    metrics->y_scale ) );

    metrics->max_advance = FT_PIX_ROUND( FT_MulFix( face->max_advance_width,
                                                    metrics->x_scale ) );
#else /* !GRID_FIT_METRICS */
    metrics->ascender    = FT_MulFix( face->ascender,
                                      metrics->y_scale );

    metrics->descender   = FT_MulFix( face->descender,
                                      metrics->y_scale );

    metrics->height      = FT_MulFix( face->height,
                                      metrics->y_scale );

    metrics->max_advance = FT_MulFix( face->max_advance_width,
                                      metrics->x_scale );
#endif /* !GRID_FIT_METRICS */
  }


  FT_BASE_DEF( void )
  FT_Select_Metrics( FT_Face   face,
                     FT_ULong  strike_index )
  {
    FT_Size_Metrics*  metrics;
    FT_Bitmap_Size*   bsize;


    metrics = &face->size->metrics;
    bsize   = face->available_sizes + strike_index;

    metrics->x_ppem = (FT_UShort)( ( bsize->x_ppem + 32 ) >> 6 );
    metrics->y_ppem = (FT_UShort)( ( bsize->y_ppem + 32 ) >> 6 );

    if ( FT_IS_SCALABLE( face ) )
    {
      metrics->x_scale = FT_DivFix( bsize->x_ppem,
                                    face->units_per_EM );
      metrics->y_scale = FT_DivFix( bsize->y_ppem,
                                    face->units_per_EM );

      ft_recompute_scaled_metrics( face, metrics );
    }
    else
    {
      metrics->x_scale     = 1L << 22;
      metrics->y_scale     = 1L << 22;
      metrics->ascender    = bsize->y_ppem;
      metrics->descender   = 0;
      metrics->height      = bsize->height << 6;
      metrics->max_advance = bsize->x_ppem;
    }
  }


  FT_BASE_DEF( void )
  FT_Request_Metrics( FT_Face          face,
                      FT_Size_Request  req )
  {
    FT_Driver_Class   clazz;
    FT_Size_Metrics*  metrics;


    clazz   = face->driver->clazz;
    metrics = &face->size->metrics;

    if ( FT_IS_SCALABLE( face ) )
    {
      FT_Long  w, h, scaled_w = 0, scaled_h = 0;


      switch ( req->type )
      {
      case FT_SIZE_REQUEST_TYPE_NOMINAL:
        w = h = face->units_per_EM;
        break;

      case FT_SIZE_REQUEST_TYPE_REAL_DIM:
        w = h = face->ascender - face->descender;
        break;

      case FT_SIZE_REQUEST_TYPE_CELL:
        w = face->max_advance_width;
        h = face->ascender - face->descender;
        break;

      case FT_SIZE_REQUEST_TYPE_BBOX:
        w = face->bbox.xMax - face->bbox.xMin;
        h = face->bbox.yMax - face->bbox.yMin;
        break;

      case FT_SIZE_REQUEST_TYPE_SCALES:
        metrics->x_scale = (FT_Fixed)req->width;
        metrics->y_scale = (FT_Fixed)req->height;
        if ( !metrics->x_scale )
          metrics->x_scale = metrics->y_scale;
        else if ( !metrics->y_scale )
          metrics->y_scale = metrics->x_scale;
        goto Calculate_Ppem;
        break;

      default:
        /* this never happens */
        return;
        break;
      }

      /* to be on the safe side */
      if ( w < 0 )
        w = -w;

      if ( h < 0 )
        h = -h;

      scaled_w = FT_REQUEST_WIDTH ( req );
      scaled_h = FT_REQUEST_HEIGHT( req );

      /* determine scales */
      if ( req->width )
      {
        metrics->x_scale = FT_DivFix( scaled_w, w );

        if ( req->height )
        {
          metrics->y_scale = FT_DivFix( scaled_h, h );

          if ( req->type == FT_SIZE_REQUEST_TYPE_CELL )
          {
            if ( metrics->y_scale > metrics->x_scale )
              metrics->y_scale = metrics->x_s