New API in gtkmm 2.6

Member Gdk::Pixbuf::flip (bool horizontal=true) const

Member Gdk::Pixbuf::rotate_simple (Rotation angle) const

Member Gdk::PixbufFormat::get_license () const

Member Gdk::PixbufFormat::is_disabled () const

Member Gdk::PixbufFormat::is_scalable () const

Member Gdk::PixbufFormat::set_disabled (bool disabled=true)