When replaying a page to a fallback image, a device scale is set based on the fallback resolution. But when the page contains groups, the device scale is not set for the groups resulting in a fallback resolution of 72dpi of the content of groups. http://lists.cairographics.org/archives/cairo/2008-May/014170.html http://lists.cairographics.org/archives/cairo/2009-September/018223.html
Fixed in git master. http://cgit.freedesktop.org/cairo/commit/?id=59661f8af428b88125db033867d662e9393d0a41
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