[cairo] Knockout groups in cairo-pdf fallbacks make poppler emit more fallbacks in cairo-ps

[Carl Worth]

On Thu, 22 May 2008 07:50:53 -0700, Carl Worth wrote:
> So, given the following chain:
>
> 	application -> cairo-pdf -> poppler -> cairo-ps
>
> We need to make sure that a fallback in the original PDF results in
> something simple like an 'image' operation in the final PostScript
> file, and not ever-larger fallback images as is currently happening.
>
> This will require care in cairo-pdf, some changes in poppler, and care
> in cairo-ps as well.
>
> I'll follow up with a simple HTML file that can be used with firefox3
> to demonstrate the problem throughout the chain, (I'll post the files
> from each stage as well).

Some of the files were large so instead of mailing them, I've posted
them here:

	http://cworth.org/cairo/a_chain_of_bugs/

along with more details about the various bugs.

Any help in fixing these would be most appreciated.

-Carl
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