Optimize QXmlStreamWriterPrivate::doWriteToDevice(QLatin1StringView)
Use a stack buffer, and perform the recoding from L1 to U8 in chunks. Solves the L1 case of Task-number: QTBUG-109284 Pick-to: 6.5 Change-Id: Ia9ac7d8b27fd452d24d9e27f0575f9fc83b6dcbc Reviewed-by: Mate Barany <mate.barany@qt.io> Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
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@ -3085,10 +3085,14 @@ void QXmlStreamWriterPrivate::doWriteToDevice(QUtf8StringView s)
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void QXmlStreamWriterPrivate::doWriteToDevice(QLatin1StringView s)
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{
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QByteArray utf8(s.size() * 2, Qt::Uninitialized);
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char *end = QUtf8::convertFromLatin1(utf8.data(), s);
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utf8.truncate(end - utf8.data());
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doWriteToDevice(QUtf8StringView{utf8});
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constexpr qsizetype MaxChunkSize = 512;
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char buffer [2 * MaxChunkSize];
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while (!s.isEmpty()) {
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const qsizetype chunkSize = std::min(s.size(), MaxChunkSize);
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char *end = QUtf8::convertFromLatin1(buffer, s.first(chunkSize));
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doWriteToDevice(QUtf8StringView{buffer, end});
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s = s.sliced(chunkSize);
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}
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}
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/*!
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