Ghostscript no longer supports UTF-16-BE-hex strings as a way of
supplying Unicode data in pdfmark so we have lost this functionality too:
http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=e997c6836d243ab37fe3a5f0d57974af95eb5eac
For users this means setting --title, --author, etc. will not work if gs
9.24 is installed, but if the file has existing metadata it might work.
For now we enforce police-state-strict ASCII, until there's time to
implement proper metadata editing. Relevant tests set to xfail.
Kodak Capture Desktop and probably other software creates a
/Outlines entry with /First being set to an invalid indirect reference to
an object that hasn't been created. This is legal in the PDF spec but
problematic for qpdf. The objgen will be (max valid object ID + 1, 0).
Because we create new objects in _weave, some TOC entries will end
up assigned to new objects we create. Typically /ProcSet.
We solve the issue by refactoring page traversal and then doing it
twice, once to resolve all references (eliminating the null
reference problem) and a second pass to make our changes.
As reported in #281 and confirmed by the test file in #279, downsampling
the preview adversely affects quality of image rotation especially for
small font sizes and marginal scans.
Full size gets rotation accuracy. This makes rotation a little inefficient
since it rasterizes twice - to be addressed later.
It looks like from the gs manual that this parameter is only respected for
vector devices so it never had any effect, but to stay on the safe side,
which it off.
Since pikepdf is doing the work the initial repair takes time and gives
little benefit.
It turns out to not be worthwhile to
save the results of PdfInfo parsing,
since the time to save this seems to exceed the costs of recalculating
it since the "weave" code. At least
for small files.
Need to use private fork of ruffus for Python 3.7. Backward compatible with Python 3.6 for ruffus 2.6.3
Disable locale checking for 3.7 since the various fixes in that release should make it unnecessary.
At some point the color gets flipped, we have to flip it again,
for mono.
Incidentally this exposed an unused
optimization. Should change the
first past to scan all images and
record monochrome xrefs, then optimize
JPEG and PNG, possibly adding
mono images to the monochrome
queue. Finally, do JBIG2 optimization.
James R. Barlow