c_gtk_source_gutter_renderer_text_measure_markup

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GtkSourceGutterRendererText* renderer, gchar* markup, gint* width, gint* height) c_gtk_source_gutter_renderer_text_measure_markup;

Meta