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Update TODO

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Remove form flattening
Clarify splitting/merging with document level constructs
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Jay Berkenbilt 2018-06-21 15:57:22 -04:00
parent 2e8a3e163f
commit 9d7eef7cc6
1 changed files with 36 additions and 8 deletions
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@ -54,6 +54,16 @@ Lexical
manner that takes advantage of the other lexical features. This
sanitizer should also clear metadata and replace images.
Page splitting/merging
======================
* Update page splitting and merging to handle document-level
constructs with page impact such as interactive forms and article
threading. Check keys in the document catalog for others, such as
outlines, page labels, thumbnails, and zones. For threads,
Subramanyam provided a test file; see ../misc/article-threads.pdf.
Email Q-Count: 431864 from 2009-11-03.
General
=======
@ -77,8 +87,32 @@ I find it useful to make reference to them in this list
filtering doesn't ever try to do this. QPDFWriter should be checked
carefully too. See also bugs/private/from-email-663916/
* Form flattening: ~/tmp/qtmp/form-flattening-email/. Distill this
into notes along with stuff in qpdf email box.
* Interactive form modification:
https://github.com/qpdf/qpdf/issues/213 contains a good discussion
of some ideas for adding methods to modify annotations and form
fields if we want to make it easier to support modifications to
interactive forms. Some of the ideas have been implemented, and
some of the probably never will be implemented, but it's worth a
read if there is an intention to work on this. In the issue, search
for "Regarding write functionality", and read that comment and the
responses to it.
* Form flattening: there is on-going work on this topic. The primary
tracking issue is https://github.com/qpdf/qpdf/issues/72, and there
has also been discussion in private email threads. My notes are
summarized in ../misc/form-flattening/README (not publicly
accessible), but all important information is in issues in github.
The non-public items in my notes are transcripts of discussions
with a google summer of code student who was working on the issue.
These notes likely have low value at this point, but I have saved
them to review in case form flattening ever moves into the qpdf
library from external tools where it is currently being
implemented. Note that flattening forms with appearance streams is
relatively straightforward, but many PDF files don't have
appearance streams and leave rendering of the form fields to the
viewer. Handling this in the general case is probably out of scope
for what will be in qpdf in the foreseeable future, particularly in
the area of embedding and subsetting fonts.
* Look at ~/Q/pdf-collection/forms-from-appian/
@ -160,12 +194,6 @@ I find it useful to make reference to them in this list
Consider implementing full Unicode password algorithms from newer
encryption formats.
* Consider impact of article threads on page splitting/merging.
Subramanyam provided a test file; see ../misc/article-threads.pdf.
Email Q-Count: 431864 from 2009-11-03. Other things to consider:
outlines, page labels, thumbnails, zones. There are probably
others.
* See if we can avoid preserving unreferenced objects in object
streams even when preserving the object streams.