[okular] [Bug 401999] Pictures inserted into PDF with other PDF Editor covered by stamp icon

[Albert Astals Cid]

https://bugs.kde.org/show_bug.cgi?id=401999

--- Comment #8 from Albert Astals Cid <aacid at kde.org> ---
(In reply to Tobias Deiminger from comment #7)
> Adobe Reader created a stamp annotation where /Name = #23clipboard. That's
> not any of the PDF standardized images, but it's portable anyway because
> Adobe Reader included a custom image representation along with the
> annotation inside the PDF. Our PDF renderer poppler took it and rendered the
> image, that's what you see in the background.
> 
> Now Okular handles stamp annotations special: Because we know poppler has
> problems with stamps (can't save custom images, can't render stamps without
> embedded appearance), there's Okular code to draw the stamp instead on top
> of the page. Okular uses the information #23clipboard from /Name to look up
> an image with that name, but of course there is none. That's what you see in
> the foreground.
> 
> An intermediate solution could be to bypass drawing a QPixmap in
> pagepainter.cpp if there was no image found by KIconLoader (use
> KIconLoader::MatchType::MatchExact and check for null pixmap or "unknown"
> pixmap). Will try to provide a patch.

Actually fixing this pdf "the right way" is not hard, we just need
https://paste.kde.org/pk6wzgiqs in poppler and then a "backendPaintsStamp" or
similar in the okular core annotation.

I was working on this but if you want to pick it up i'm more than happy if you
move it forward

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