If we want to have Harfbuzz Support working together with cairo & freetype, we need a corresponding HarfBuzzNGFace implementation. Some of the required font info can be retrieved using cairo_scaled_font_* API, but for some we need to fall through to the Freetype implementation, for example to retrieve certain tables from the font. For reference: http://freetype.sourceforge.net/freetype2/docs/reference/ft2-truetype_tables.html#FT_Get_Sfnt_Table
*** This bug has been marked as a duplicate of bug 91864 ***