[cairo] max bitmap size ?

[John Ellson]

 From graphviz usage, it seems that cairo has a maximum bitmap image 
size of: x < 2**15, y < 2**15
Is this what is expected?

It seems that the gd library, and the underlying libpng and libjpeg, 
have less restrictive limit
of x * y < 2**16

Can cairo be coerced into supporting these larger x or y sizes, so that 
taller or wider images can be supported
in the same total memory size?

John