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QStyleHelper::uniqueName(): Improve palette pixmap cache key 

Use QDataStream to obtain cache key for a palettes that are different
from the default QPalette. This results in unique keys for palettes
created from QStyleSheetStyle's render rules.

Task-number: QTBUG-56743
Change-Id: Icbfe165f705ef3e1c9e88cfc9dca88ff1d1e81e6
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
This commit is contained in:
Friedemann Kleint 2016-11-02 16:45:41 +01:00
parent 356f5bbac3
commit d7bcdc3a44
1 changed files with 21 additions and 1 deletions
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22
src/widgets/styles/qstylehelper.cpp
View File

@ -43,6 +43,8 @@
#include "qstylehelper_p.h"
#include <qstringbuilder.h>
#include <qdatastream.h>
#include <qcryptographichash.h>
QT_BEGIN_NAMESPACE
@ -56,7 +58,6 @@ QString uniqueName(const QString &key, const QStyleOption *option, const QSize &
QString tmp = key % HexString<uint>(option->state)
% HexString<uint>(option->direction)
% HexString<uint>(complexOption ? uint(complexOption->activeSubControls) : 0u)
% HexString<quint64>(option->palette.cacheKey())
% HexString<uint>(size.width())
% HexString<uint>(size.height());
@ -67,6 +68,25 @@ QString uniqueName(const QString &key, const QStyleOption *option, const QSize &
% QLatin1Char(spinBox->frame ? '1' : '0'); ;
}
#endif // QT_NO_SPINBOX
// QTBUG-56743, try to create a palette cache key reflecting the value,
// as leaks may occur in conjunction with QStyleSheetStyle/QRenderRule modifying
// palettes when using QPalette::cacheKey()
if (option->palette != QGuiApplication::palette()) {
tmp.append(QLatin1Char('P'));
#ifndef QT_NO_DATASTREAM
QByteArray key;
key.reserve(5120); // Observed 5040B for a serialized palette on 64bit
{
QDataStream str(&key, QIODevice::WriteOnly);
str << option->palette;
}
const QByteArray sha1 = QCryptographicHash::hash(key, QCryptographicHash::Sha1).toHex();
tmp.append(QString::fromLatin1(sha1));
#else // QT_NO_DATASTREAM
tmp.append(QString::number(option->palette.cacheKey(), 16));
#endif // !QT_NO_DATASTREAM
}
return tmp;
}