[Bug 1859632]

[Haxtibal]

Just had a look into it, this is what I found. Dependent on users
choice, Okular sets the annotation dicts /Name entry to standard names
("Approved", "Confidential", ... see PDF 32000-1:2008, chapter 12.5.6.12
Rubber Stamp Annotations, Table 181), but also to non standard names
("okular", "kde", <path_to_your_custom_image>). Conforming readers
implement a representation for the standard names (may look a bit
different as in Okular, but at least something reasonable is shown). But
of course non standard names like "okular", "kde", <some_local_path> are
not understood by other readers. A portable way to have such custom
stamps would be to add an /AP entry with the full icon representation
into the PDF. Unfortunately, Poppler can't generate appearance streams
for stamps yet. Note that Poppler #23108 is a bit different, it is about
hardcoded default appearance streams, not about generating ones for your
custom image.

There's another special thing about stamps. Contrary to most other
annotation types, stamps are not rendered by Poppler, but by Okular
itself. Okular first looks for /Name in ui/data/stamps.svg (contains
"approved", "confidential", "departmental"...). If there's no match, it
uses KIconLoader lookup an icon. Not rendering with Poppler probably
introduces special handling when printing, haven't checked that yet.

I guess an ideal solution for this bug will require aid from Poppler
side (maybe a new API to store raster and vector graphics as appearance
stream into the PDF, and some predefined appearance streams for the
standard names so that stamps without /AP can be rendered).

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https://bugs.launchpad.net/bugs/1859632

Title:
  Stamp annotations cannot be printed to pdf or "flattened"

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