[poppler] pdftocairo rotation different than pdftops

[Pierre-Luc Samuel]

Hi all,

I've been experimenting with using pdftocairo as a replacement to 
pdftops, but I am encountering a bug with document rotation.

"pdftops" respects rotations
"pdftocairo -ps" has correct 90 and 270 degrees, but 0 and 180 degrees 
are inverted.  Files attached.

I have some time to investigate this, but do you guys think it would be 
a poppler bug or a libcairo bug?

Thanks,
Pierre-Luc
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