[cairo] Problems with cairo PDF generation and Mac OS X PDF rendering

[John Ellson]

Malcolm Tredinnick wrote:
> One thing I noticed about the PDF you attached is that it does not
> follow the recommendation at the end of section 3.4.1 of the PDF spec (I
> am using version 1.6 as my reference). Namely, when a PDF contains
> binary data, it is recommended that the header line ("%PDF-1.4") be
> immediately followed by a comment containing at least four binary
> characters (with character codes >= 128)

Thanks Malcolm and Dominic for identifying this cairo generator issue,  
but I'm
wondering if I have a graphviz issue as well.   Can you suggest what it 
is that I'm doing
to get any binary data in the PDF output?   I'm just generating simple 
line drawings.  Is it because
I'm not generating exact pixel coordinates in the device space?

John