Function FT_Get_Color_Glyph_Layer 

pub unsafe extern "C" fn FT_Get_Color_Glyph_Layer(
    face: FT_Face,
    base_glyph: FT_UInt,
    aglyph_index: *mut FT_UInt,
    acolor_index: *mut FT_UInt,
    iterator: *mut FT_LayerIterator,
) -> bool