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Improve performance of QResource::load()

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Avoid creating a QDateTime in the resource that will almost
never get used. Constructing the date time is expensive as we
convert the time stamp to local time.

Task-number: QTBUG-65713
Change-Id: I3638e108a8fbd237cd93e98aa2adc0ca2127822c
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Tuukka Turunen <tuukka.turunen@qt.io>
This commit is contained in:
Lars Knoll 2018-01-12 16:43:48 +01:00 committed by Simon Hausmann
parent a8906e3510
commit 07f1c96658
1 changed files with 8 additions and 12 deletions
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20
src/corelib/io/qresource.cpp
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@ -116,7 +116,7 @@ public:
inline bool isContainer(int node) const { return flags(node) & Directory; }
inline bool isCompressed(int node) const { return flags(node) & Compressed; }
const uchar *data(int node, qint64 *size) const;
QDateTime lastModified(int node) const;
quint64 lastModified(int node) const;
QStringList children(int node) const;
virtual QString mappingRoot() const { return QString(); }
bool mappingRootSubdir(const QString &path, QString *match=0) const;
@ -245,7 +245,7 @@ public:
mutable qint64 size;
mutable const uchar *data;
mutable QStringList children;
mutable QDateTime lastModified;
mutable quint64 lastModified;
QResource *q_ptr;
Q_DECLARE_PUBLIC(QResource)
@ -259,7 +259,7 @@ QResourcePrivate::clear()
data = 0;
size = 0;
children.clear();
lastModified = QDateTime();
lastModified = 0;
container = 0;
for(int i = 0; i < related.size(); ++i) {
QResourceRoot *root = related.at(i);
@ -301,7 +301,7 @@ QResourcePrivate::load(const QString &file)
data = 0;
size = 0;
compressed = 0;
lastModified = QDateTime();
lastModified = 0;
res->ref.ref();
related.append(res);
}
@ -539,7 +539,7 @@ QDateTime QResource::lastModified() const
{
Q_D(const QResource);
d->ensureInitialized();
return d->lastModified;
return d->lastModified ? QDateTime::fromMSecsSinceEpoch(d->lastModified) : QDateTime();
}
/*!
@ -797,18 +797,14 @@ const uchar *QResourceRoot::data(int node, qint64 *size) const
return 0;
}
QDateTime QResourceRoot::lastModified(int node) const
quint64 QResourceRoot::lastModified(int node) const
{
if (node == -1 || version < 0x02)
return QDateTime();
return 0;
const int offset = findOffset(node) + 14;
const quint64 timeStamp = qFromBigEndian<quint64>(tree + offset);
if (timeStamp == 0)
return QDateTime();
return QDateTime::fromMSecsSinceEpoch(timeStamp);
return qFromBigEndian<quint64>(tree + offset);
}
QStringList QResourceRoot::children(int node) const