CAIRO

What is Cairo?

Cairo is a software library used to provide a vector graphics-based, device-independent API for software developers. It is designed to provide primitives for 2-dimensional drawing across a number of different backends. Cairo is designed to use hardware acceleration when available.

Cairo "2D Vector Graphics Library" 
Cairo graphics tutorial. It is done in the C programming language. 
This tutorial is for beginners and intermediate developers 100+ pages. 
[HTML] http://zetcode.com/tutorials/cairographicstutorial/ 

Cairo Concepts 
A one-of-a-kind introduction to cairo concepts and models. 
[HTML] http://cairographics.org/tutorial/ 

Writing a Widget Using Cairo and GTK+ 2.0 
[HTML] Part1: http://www.gnomejournal.org/article/34/writing-a-widget-using-cairo-and-gtk28 
[HTML] Part2: http://www.gnomejournal.org/article/36/writing-a-widget-using-cairo-and-gtk28-part-2 

source: http://www.gtkforums.com/about988.html