// borrowed from Wine

typedef struct {
    FT_Short height;
    FT_Short width;
    FT_Pos size;
    FT_Pos x_ppem;
    FT_Pos y_ppem;
    FT_Short internal_leading;
} ROS_Bitmap_Size;

static inline void 
get_bitmap_size(FT_Face ft_face, ROS_Bitmap_Size *face_size)
{
    FT_Bitmap_Size *size;
    FT_WinFNT_HeaderRec winfnt_header;

    size = ft_face->available_sizes;
    DPRINT("Adding bitmap size h %d w %d size %ld x_ppem %ld y_ppem %ld\n",
           size->height, size->width, size->size >> 6,
           size->x_ppem >> 6, size->y_ppem >> 6);
    ASSERT(face_size);
    face_size->height = size->height;
    face_size->width = size->width;
    face_size->size = size->size;
    face_size->x_ppem = size->x_ppem;
    face_size->y_ppem = size->y_ppem;

    if (FT_Get_WinFNT_Header(ft_face, &winfnt_header))
        return;

    face_size->internal_leading = winfnt_header.internal_leading;
    if (winfnt_header.external_leading > 0 &&
        (face_size->height == winfnt_header.pixel_height + winfnt_header.external_leading))
    {
        face_size->height = winfnt_header.pixel_height;
    }
}