[cairo] Memory issues?

[Rajeev]

hi guys,
Im an evolution hacker, adding cairo support to UI of evolution
calendar,. I love cairo and the wide variety of cool API's it
provides,. Im having few issues which i list here,

1. Is the cairo API documentation has complete list of what cairo API
offers? [http://www.cairographics.org/manual]. Because API's like
cairo_clip_intersect_to_rectangle
which are so important in the present design of evolution UI are
missing out in the available online documentation, which is very much
a matter of concern, if its not, when can i expect that to be
complete?

2.So, this is how, i create a cairo context for use with the other cairo API's
gdk_cairo_create (drawable)
drawable is nothing but a GdkDrawable object.
After i completely drawing the UI
refer :
http://www.flickr.com/photo_zoom.gne?id=125074074&size=o
http://www.flickr.com/photo_zoom.gne?id=125074073&size=o
http://www.flickr.com/photo_zoom.gne?id=125074072&size=o
i can see the UI hitting the maximum memory consumption for rendering
it which was not there earlier.
With what i referred to, i can cairo API provides, good rendering over
the X Window
System and in-memory image buffers.
Is there any known issues for that?
If necessary i can send the code as well, which i added here to the UI
and i am so desperate to get that solved soon, :)

with regards,
A cairo lover