Main Gtk struct. An opaque structure holding all options that are used when rendering fonts. Individual features of a cairo_font_options_t can be set or accessed using functions named cairo_font_options_set_feature_name() and cairo_font_options_get_feature_name(), like cairo_font_options_set_antialias() and cairo_font_options_get_antialias(). New features may be added to a cairo_font_options_t in the future. For this reason, cairo_font_options_copy(), cairo_font_options_equal(), cairo_font_options_merge(), and cairo_font_options_hash() should be used to copy, check for equality, merge, or compute a hash value of cairo_font_options_t objects. Since 1.0

struct cairo_font_options_t