As usual the guys at google have been busy and released a nice new feature for their (quite new) google chart api. It support 2D bar codes also known as QR codes. Whats more, they even offer a free decoding library for it (Xzing). Big respect googlers to your free APIs
in case you hadn’t come across it yet I posted a guide to some of the functions you can call on the google qr api
unfortunately there is a real lack of content in the google provided documentation.
here’s an auto encoder based on google chart api