[poppler] Poppler and partial rendering

[Peter17]

Dear all,

I am studying those bug reports: [1], [2], [3] and this e-mail [4].

To sum up, Evince and Okular are using Poppler as a backend. The zoom,
in those 2 software, is limited to 400%. People has been requesting
more zoom for years, but this has not been implemented because of a
too large memory consumption. Actually, zooming in Okular or Evince
will render the whole page in the memory and not just the displayed
part of the page.

Could someone among the Poppler developers summarize the situation by
answering those questions, please?

Is partial page rendering implemented in Poppler?
If no, how hard do you think it would be to implement it?
If yes, where in the source code? How hard is it how to use it in a
software? Is there a place where this function is documented? Is it
frontend-dependent?

Thanks in advance

Best regards

[1] https://bugs.launchpad.net/evince/+bug/241604
[2] https://bugzilla.gnome.org/show_bug.cgi?id=303365
[3] https://bugs.kde.org/show_bug.cgi?id=148527
[4] http://lists.freedesktop.org/archives/poppler/2005-November/001125.html

--
Peter Potrowl