[cairo] Meta surface proposal

[Keith Packard]

Around 16 o'clock on Feb 6, Owen Taylor wrote:

> cairo_meta_surface_t is a helper surface type that is used for surface
> types where:

One thought expressed here before is to use the PDF generated by cairo as 
the meta file format, and use files instead of memory to hold the data.  
Of course, we could easily stream the PDF into memory for environments 
without a (large) mutable file system.

It would tie the PDF backend to our cairo-specific PDF reader, which may 
make development in that area more difficult.  But, it would eliminate yet 
another graphics "file" format and make it significantly easier to test 
the writer and reader separately.

-keith


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