gray8_adaptor_type
typedef typename font_engine_type::gray8_adaptor_type gray8_adaptor_type;
typedef typename gray8_adaptor_type::embedded_scanline gray8_scanline_type;
gray8_adaptor_type& gray8_adaptor() { return m_gray8_adaptor; }
gray8_adaptor_type m_gray8_adaptor;
typedef font_engine_freetype_base::gray8_adaptor_type gray8_adaptor_type;
typedef font_engine_freetype_base::gray8_adaptor_type gray8_adaptor_type;