Chris Newhouse created PDFBOX-5583:
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Summary: Adding font (or changing font subset) not coming through
in saveIncremental
Key: PDFBOX-5583
URL: https://issues.apache.org/jira/browse/PDFBOX-5583
Project: PDFBox
Issue Type: Bug
Components: AcroForm, PDModel, Signing
Affects Versions: 2.0.24
Reporter: Chris Newhouse
Attachments: update-after-signature-includes-font-change.pdf
In an effort to keep file sizes small, we leverage Font Subsets in our PDFs.
Also, we already have "incremental change and signing" (where fields are
changed _after_ a signature, without voiding the prior signature thanks to
using `saveIncremental` and signing the changes) working just fine in most
cases.
However, when the Font on a field is changed or a new Font Subset must be added
to the document because the characters used in a field with a tightly-subsetted
Font, things don't work correctly:
* The signatures stay valid, which is great
* But the new Font information does not appear to get written to new version
appendix, so you get nonsense rendering in a PDF viewer since the field still
points to a Font resource that is either not there or is a subset that does not
contain all the necessary characters. I'm not super proficient in this so I
don't know exactly what's going on.
I have ensured that the fields we update are getting marked as
`setNeedToBeUpdated(true)` (this is, I believe, why the fields changes _do_ end
up in the version changes), it just seems that the Font resources are not
getting updated in the version.
I have also tried to mark the document's PDResource as
`setNeedToBeUpdated(true)` but to no avail.
Is this behavior possible/allowed? Is it a bug or am I doing something wrong?
I have included an example file where the field named `incrementalChangeField`
goes from `NotoSans-Regular` to `NotoSansCJK-Regular` during the incremental
change, but the font resource does not get added.
Thanks for your time!
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