http://raspberrycompote.blogspot.nl/2012/12/low-level-graphics-on-raspberry-pi-part_9509.html
Basic, get screen info
http://raspberrycompote.blogspot.nl/2013/01/low-level-graphics-on-raspberry-pi-part.html
PArt 2 goes into actually drawing
http://raspberrycompote.blogspot.nl/2013/01/low-level-graphics-on-raspberry-pi-part_22.html
The details of the mapped display memory
and so on
http://raspberrycompote.blogspot.nl/2013/04/low-level-graphics-on-raspberry-pi-part.html
All code here: https://github.com/rst-/raspberry-compote
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