The GNOME canvas is an engine for structured graphics that offers a rich
imaging model, high performance rendering, and a powerful, high-level API.
It offers a choice of two rendering back-ends, one based on Xlib for
extremely fast display, and another based on Libart, a sophisticated,
antialiased, alpha-compositing engine. Applications have a choice between
the Xlib imaging model or a superset of the PostScript imaging model,
depending on the level of graphic sophistication required.