[cairo] how to copy a rect area from one surface to another

[Kelvin Cheng]

Hello,

I am new to the Cairo.
I am looking for a way to copy a portion of a surface to another surface. 
How should I do this ?

Currently, this is what I am attempting to do:

1) Draw something on a surface
2) determine the bounding rectangle for the "things" on surface in 1)
3) Create another surface. Copy the contents within the bounding rectangle 
in 2) to the newly created surface.

It seems that the cairo_paint() etc, functions copy the source surface 
from (0, 0). 

Please help. Thanks.

Regards,
Kelvin
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