Reverse character rotation in lcd

Due to physical constraints, I needed to put the lcd display backwards so now I have to read it upside down :). Is there a way to "flip" the characters easily? A similar post was made a while ago: Rotate and reverse characters in LCD display - Programming Questions - Arduino Forum but I'm sure I quite understand how to implement the proposed solution.
I am using the liquidcrystal library by the way.

Not if it's an HD44780 controller. It's easy if you have a graphical display to invert the characters, but with a standard character display the only way is to use a mirror.