Bug 82963

Summary: pdftocairo gets stuck on the PDF
Product: cairo Reporter: Alex Korobkin <korobkin+lpad>
Component: generalAssignee: Chris Wilson <chris>
Status: RESOLVED FIXED QA Contact: cairo-bugs mailing list <cairo-bugs>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Attachments: cairo-bad-pdf.pdf
cairo-bad-pdf-2.pdf

Description Alex Korobkin 2014-08-22 19:17:06 UTC 
When i convert this kind of PDFs into level 3 PostScript with pdftocairo, it gets stuck for many minutes (waited 30 min, killed it). At the same time it takes only 6 seconds for pdftops to process this file. 

Used commands: 
pdftocairo -ps -level3 ./cairo-bad-pdf.pdf out.ps
pdftops -level3 ./cairo-bad-pdf.pdf out.ps

As tested on poppler-utils 0.26.4, cairo 1.12.16.
Comment 1 Alex Korobkin 2014-08-22 19:17:26 UTC 
Created attachment 105122 [details]
cairo-bad-pdf.pdf
Comment 2 Adrian Johnson 2014-10-07 10:39:36 UTC 
Looks like the recording surface is stuck in a loop.
Comment 3 Alex Korobkin 2014-10-15 21:48:59 UTC 
Created attachment 107901 [details]
cairo-bad-pdf-2.pdf

Similar issue with this one page PDF. It takes 2+ minutes on my workstation for pdftocairo to process this PDF, while pdftops finishes in 3 seconds.
Comment 4 Adrian Johnson 2016-07-09 10:57:26 UTC 
Using the Debian Jessie versions (cairo 1.14.0/poppler 0.26.5):

$ time pdftocairo -ps -level3 cairo-bad-pdf-2.pdf out.ps

real    0m39.002s
user    0m32.084s
sys     0m6.688s

I gave up waiting for cairo-bad-pdf.pdf to finish.

Using lastest cairo git and poppler git:

$ time pdftocairo -ps -level3 cairo-bad-pdf.pdf out.ps

real    1m32.148s
user    1m22.080s
sys     0m10.096s

$ time ~/usr/bin/pdftocairo -ps -level3 cairo-bad-pdf-2.pdf out.ps

real    0m7.413s
user    0m6.436s
sys     0m0.896s

The reason cairo-bad-pdf.pdf take a long time is it contains a very large number (I lost count while reading through the pdf) of nested transparency groups.

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