[cairo] GTK+ cairo canvas widget

[Damon Chaplin]

Hi,

I've been working on a GTK+ cairo canvas widget, goocanvas:
  http://www.dachaplin.dsl.pipex.com/goocanvas/

See the TODO file for things left to finish.

I'm fairly new to cairo, so if anyone spots a problem with the cairo
code let me know (I think the image drawing code may be wrong, for
instance).

Also, currently the layout of the text (using Pango) changes when you
zoom in/out, even though I've used CAIRO_HINT_METRICS_OFF. If anyone
knows a way to fix that I'd really appreciate it.

Damon