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Tidy QPDF::pushInheritedAttributesToPageInternal

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Remove unnecessary parameters.
Remove code that is unnecessary as result of a prior call to QPDF::getAllPages.
Avoid clearing and rebuilding of m->all_pages.
This commit is contained in:
m-holger 2022-07-12 18:40:30 +01:00
parent ff69773b35
commit 0356bcecc5
2 changed files with 22 additions and 68 deletions
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4
include/qpdf/QPDF.hh
View File

@ -1616,10 +1616,8 @@ class QPDF
void pushInheritedAttributesToPageInternal(
QPDFObjectHandle,
std::map<std::string, std::vector<QPDFObjectHandle>>&,
std::vector<QPDFObjectHandle>& all_pages,
bool allow_changes,
bool warn_skipped_keys,
std::set<QPDFObjGen>& visited);
bool warn_skipped_keys);
void updateObjectMaps(
ObjUser const& ou,
QPDFObjectHandle oh,

86
libqpdf/QPDF_optimization.cc
View File

@ -148,15 +148,11 @@ QPDF::pushInheritedAttributesToPage(bool allow_changes, bool warn_skipped_keys)
// key_ancestors is a mapping of page attribute keys to a stack of
// Pages nodes that contain values for them.
std::map<std::string, std::vector<QPDFObjectHandle>> key_ancestors;
this->m->all_pages.clear();
std::set<QPDFObjGen> visited;
pushInheritedAttributesToPageInternal(
this->m->trailer.getKey("/Root").getKey("/Pages"),
key_ancestors,
this->m->all_pages,
allow_changes,
warn_skipped_keys,
visited);
warn_skipped_keys);
if (!key_ancestors.empty()) {
throw std::logic_error("key_ancestors not empty after"
" pushing inherited attributes to pages");
@ -169,35 +165,9 @@ void
QPDF::pushInheritedAttributesToPageInternal(
QPDFObjectHandle cur_pages,
std::map<std::string, std::vector<QPDFObjectHandle>>& key_ancestors,
std::vector<QPDFObjectHandle>& pages,
bool allow_changes,
bool warn_skipped_keys,
std::set<QPDFObjGen>& visited)
bool warn_skipped_keys)
{
QPDFObjGen this_og = cur_pages.getObjGen();
if (visited.count(this_og) > 0) {
throw QPDFExc(
qpdf_e_pages,
this->m->file->getName(),
this->m->last_object_description,
0,
"Loop detected in /Pages structure (inherited attributes)");
}
visited.insert(this_og);
if (!cur_pages.isDictionary()) {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
this->m->file->getLastOffset(),
"invalid object in page tree");
}
// Extract the underlying dictionary object
std::string type = cur_pages.getKey("/Type").getName();
if (type == "/Pages") {
// Make a list of inheritable keys. Only the keys /MediaBox,
// /CropBox, /Resources, and /Rotate are inheritable
// attributes. Push this object onto the stack of pages nodes
@ -265,17 +235,25 @@ QPDF::pushInheritedAttributesToPageInternal(
}
}
// Visit descendant nodes.
QPDFObjectHandle kids = cur_pages.getKey("/Kids");
int n = kids.getArrayNItems();
for (int i = 0; i < n; ++i) {
pushInheritedAttributesToPageInternal(
kids.getArrayItem(i),
key_ancestors,
pages,
allow_changes,
warn_skipped_keys,
visited);
// Process descendant nodes.
for (auto& kid: cur_pages.getKey("/Kids").aitems()) {
if (kid.isDictionaryOfType("/Pages")) {
pushInheritedAttributesToPageInternal(
kid, key_ancestors, allow_changes, warn_skipped_keys);
} else {
// Add all available inheritable attributes not present in
// this object to this object.
for (auto const& iter: key_ancestors) {
std::string const& key = iter.first;
if (!kid.hasKey(key)) {
QTC::TC("qpdf", "QPDF opt resource inherited");
kid.replaceKey(key, iter.second.back());
} else {
QTC::TC(
"qpdf", "QPDF opt page resource hides ancestor");
}
}
}
}
// For each inheritable key, pop the stack. If the stack
@ -295,28 +273,6 @@ QPDF::pushInheritedAttributesToPageInternal(
} else {
QTC::TC("qpdf", "QPDF opt no inheritable keys");
}
} else if (type == "/Page") {
// Add all available inheritable attributes not present in
// this object to this object.
for (auto const& iter: key_ancestors) {
std::string const& key = iter.first;
if (!cur_pages.hasKey(key)) {
QTC::TC("qpdf", "QPDF opt resource inherited");
cur_pages.replaceKey(key, iter.second.back());
} else {
QTC::TC("qpdf", "QPDF opt page resource hides ancestor");
}
}
pages.push_back(cur_pages);
} else {
throw QPDFExc(
qpdf_e_damaged_pdf,
this->m->file->getName(),
this->m->last_object_description,
this->m->file->getLastOffset(),
"invalid Type " + type + " in page tree");
}
visited.erase(this_og);
}
void