Hi,
It's not supported. Supporting it would be a bit of work, i.e. making a
(partial?) clone of the OCG stuff (not just assign it) for each split
document and then find and remove "orphans".
Same for the structure tree (which is probably 10x more complicated).
Tilman
On 31.07.2023 19:15, Stefan Wurzinger wrote:
Hi,
when using the org.apache.pdfbox.multipdf.Splitter the resulting documents
don't contain any information about the optional content (OC) blocks in the
document (see chapters 4.10 and 10.5 in the PDF 1.6 Spec) anymore, which
results in making all optional content visible.
Example (Kotlin):
URL("https://www.pdfill.com/example/pdf_layer_new.pdf";).openStream().use
{ inputStream ->
PDDocument.load(inputStream).use { inputDoc ->
val resultDocs = Splitter().apply {
setStartPage(1)
setEndPage(1)
}.split(inputDoc)
val resultDoc = resultDocs.first()
// resultDoc.documentCatalog.ocProperties =
inputDoc.documentCatalog.ocProperties
resultDoc.save(File("pdf_layer_new-split.pdf"))
}
}
One can copy the ocProperties from the original document (see commented line in
example above) which seems to fix the issue, but doesn't remove unused OCGs
when they're not referenced on the split page(s).
Is this intended behaviour and is copying the original ocProperties a proper
workaround?
Thanks for your suggestions.
Best Regards,
Stefan Wurzinger
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