Hello.
I adapted the library for Arduino DUE. I also added a method to paint buttons, I added some new parameters to several methods, and have optimized several loops gaining some speed.
I've only tested on a 480x272 screen with SSD1963.
I have not tried the method LCD_Writ_Bus to 8 bits.
I was sent to the developer UTFT, but if you want to have before, you can download from the following link http://www.piensayactua.com/tmp/UTFT.rar
greetings