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Code Issues Releases Wiki Activity

Revert preservations of outlines with --split-pages

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The preservation of outlines didn't provide very useful behavior
anyway as it copied all outlines but most didn't work. This
implementation also caused a very significant performance hit and so
is being reverted until a proper solution can be coded. The eventual
solution will not be compatible with the reverted solution anyway, so
it's best not to leave this in.
This commit is contained in:
Jay Berkenbilt 2019-04-20 16:30:22 -04:00
parent 8ce3b53cea
commit a5a016cdd2
4 changed files with 23 additions and 25 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2019-04-20 Jay Berkenbilt <ejb@ql.org>
* Revert change that included preservation of outlines (bookmarks)
in --split-pages. The way it was implemented caused a very
significant performance penalty when splitting pages with
outlines. We need a better solution that only copies the relevant
items, not the whole tree.
2019-03-11 Jay Berkenbilt <ejb@ql.org>
* JSON serialization: add missing leading 0 to decimal values

11
TODO
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@ -77,6 +77,17 @@ Page splitting/merging
* make sure conflicting named destinations work possibly test by
including the same file by two paths in a merge
Note: original implementation of bookmark preservation for split
pages caused a very high performance hit. The problem was
introduced in 313ba081265f69ac9a0324f9fe87087c72918191 and reverted
in the commit that adds this paragraph. The revert includes marking
a few tests cases as $td->EXPECT_FAILURE. When properly coded, the
test cases will need to be adjusted to only include the parts of
the outlines that are actually copied. The tests in question are
"split page with outlines". When implementing properly, ensure that
the performance is not adversely affected by timing split-pages on
a large file with complex outlines such as the PDF specification.
When pruning outlines, keep all outlines in the hierarchy that are
above an outline for a page we care about. If one of the ancestor
outlines points to a non-existent page, clear its dest. If an

24
qpdf/qpdf.cc
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@ -4966,30 +4966,6 @@ static void write_outfile(QPDF& pdf, Options& o)
"/Nums", QPDFObjectHandle::newArray(labels));
outpdf.getRoot().replaceKey("/PageLabels", page_labels);
}
// Copying the outlines tree, names table, and any
// outdated Dests key from the original file will make
// some things work in the split files. It is not a
// complete solution, but at least outlines whose
// destinations are on pages that have been preserved will
// work normally. There are other top-level structures
// that should be copied as well. This will be improved in
// the future.
std::list<std::string> to_copy;
to_copy.push_back("/Names");
to_copy.push_back("/Dests");
to_copy.push_back("/Outlines");
for (std::list<std::string>::iterator iter = to_copy.begin();
iter != to_copy.end(); ++iter)
{
QPDFObjectHandle orig = pdf.getRoot().getKey(*iter);
if (! orig.isIndirect())
{
orig = pdf.makeIndirectObject(orig);
}
outpdf.getRoot().replaceKey(
*iter,
outpdf.copyForeignObject(orig));
}
std::string page_range = QUtil::int_to_string(first, pageno_len);
if (o.split_pages > 1)
{

5
qpdf/qtest/qpdf.test
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@ -1594,6 +1594,8 @@ foreach my $i (qw(01-06 07-11))
{$td->FILE => "labels-split-$i.pdf"});
}
# See comments in TODO about these expected failures. Search for
# "split page with outlines".
$td->runtest("split page with outlines",
{$td->COMMAND => "qpdf --qdf --static-id --split-pages=10".
" outlines-with-actions.pdf split-out-outlines.pdf"},
@ -1602,7 +1604,8 @@ foreach my $i (qw(01-10 11-20 21-30))
{
$td->runtest("check output ($i)",
{$td->FILE => "split-out-outlines-$i.pdf"},
{$td->FILE => "outlines-split-$i.pdf"});
{$td->FILE => "outlines-split-$i.pdf"},
$td->EXPECT_FAILURE)
}
foreach my $d (@sp_cases)