cr to source. This pattern
will then be used for any subsequent drawing operation until a new
source pattern is set.cairoSetSource(cr, source)cairoSetSource. This means
that further modifications of the current transformation matrix
will not affect the source pattern. See cairoPatternSetMatrix.
XXX: I'd also like to direct the reader's attention to some
(not-yet-written) section on cairo's imaging model. How would I do
that if such a section existed? (cworth).