[okular] [Bug 383651] Custom/image stamp annotations are not saved into the PDF file in a way that can be printed or that other readers can see

[Oliver Sander]

https://bugs.kde.org/show_bug.cgi?id=383651

--- Comment #11 from Oliver Sander <oliver.sander at tu-dresden.de> ---
Can somebody please post this on the gsoc project list for me?  Thanks!

Project: Improve custom stamp annotation handling

Brief explanation: Okular does display stamp annotations, but the support
is somewhat incomplete. This particularly shows when trying to use stamp
annotations with a custom image.  For example, such annotations can be
added in Okular, but they cannot be saved to the pdf file in a way
that any other pdf viewer can read.  Also, they will not appear on print-outs.

The underlying reason for this is that Okular renders these stamps itself,
rather than relying on the poppler library, which does all other pdf
rendering.  Goal of this project is therefore to teach poppler how to
render stamp annotations, and then make Okular use that new functionality.
More details can be found in the bug report [0].

[0] https://bugs.kde.org/show_bug.cgi?id=383651

Expected results:  Poppler should render stamp annotations.  Annotations
should be printable from Okular. Custom stamps inserted via the Okular GUI
should be visible in other pdf readers.

Knowledge prerequisite: C++, and a bit about the pdf format.

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