optimization: get rid of QString::fromUtf16() usage

QString::fromUtf16() is slow - it does a BOM check and optionally byte
swapping, which is utterly pointless when converting internal data
structures which are raw utf16 in host byte order anyway. so replace
it with QString::fromRawData() (for short-lived strings) or
QString(const QChar *, int) (otherwise) if possible.

Reviewed-by: axis
Reviewed-by: mariusSO
Reviewed-by: Bill King

1 files changed, 2 insertions, 1 deletions

diff --git a/src/gui/kernel/qclipboard_s60.cpp b/src/gui/kernel/qclipboard_s60.cpp
index 71c355b..f07e066 100644
--- a/src/gui/kernel/qclipboard_s60.cpp
+++ b/src/gui/kernel/qclipboard_s60.cpp
@@ -164,7 +164,8 @@ void readFromStreamLX(QMimeData* aData,RReadStream& aStream)
         TCardinality mimeTypeSize;
         aStream >> mimeTypeSize;
         HBufC* mimeTypeBuf = HBufC::NewLC(aStream,mimeTypeSize);
-        QString mimeType = QString::fromUtf16(mimeTypeBuf->Des().Ptr(),mimeTypeBuf->Length());
+        QString mimeType = QString(reinterpret_cast<const QChar *>(mimeTypeBuf->Des().Ptr()),
+                                   mimeTypeBuf->Length());
         CleanupStack::PopAndDestroy(mimeTypeBuf);
         // mime data
         TCardinality dataSize;