[cairo] vector pdf write

[czh_0611 at 163.com]

Hello:
   we use Cairo to generate vector PDF files. We write a lot of content and can't print it. The attached PDF file is generated by us, please help to see what problem。
   Please , we need to write vector PDF, one page contains more than 100000 points. At present, we draw rectangle filling, but the file is too large. It's not convenient to print. Do you have a good way to set the file size. Thanks！




czh_0611 at 163.com
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