diff -r b72c6db6890b -r 5dc02b23752f src/corelib/tools/qeasingcurve.cpp
--- a/src/corelib/tools/qeasingcurve.cpp	Wed Jun 23 19:07:03 2010 +0300
+++ b/src/corelib/tools/qeasingcurve.cpp	Tue Jul 06 15:10:48 2010 +0300
@@ -304,6 +304,10 @@
 #include <QtCore/qstring.h>
 #endif
 
+#ifndef QT_NO_DATASTREAM
+#include <QtCore/qdatastream.h>
+#endif
+
 QT_BEGIN_NAMESPACE
 
 static bool isConfigFunction(QEasingCurve::Type type)
@@ -600,11 +604,11 @@
     Construct a copy of \a other.
  */
 QEasingCurve::QEasingCurve(const QEasingCurve &other)
-: d_ptr(new QEasingCurvePrivate)
+    : d_ptr(new QEasingCurvePrivate)
 {
     // ### non-atomic, requires malloc on shallow copy
     *d_ptr = *other.d_ptr;
-    if(other.d_ptr->config)
+    if (other.d_ptr->config)
         d_ptr->config = other.d_ptr->config->copy();
 }
 
@@ -629,7 +633,7 @@
     }
 
     *d_ptr = *other.d_ptr;
-    if(other.d_ptr->config)
+    if (other.d_ptr->config)
         d_ptr->config = other.d_ptr->config->copy();
 
     return *this;
@@ -845,6 +849,67 @@
     }
     return debug;
 }
-#endif
+#endif // QT_NO_DEBUG_STREAM
+
+#ifndef QT_NO_DATASTREAM
+/*!
+    \fn QDataStream &operator<<(QDataStream &stream, const QEasingCurve &easing)
+    \relates QEasingCurve
+
+    Writes the given \a easing curve to the given \a stream and returns a
+    reference to the stream.
+
+    \sa {Serializing Qt Data Types}
+*/
+
+QDataStream &operator<<(QDataStream &stream, const QEasingCurve &easing)
+{
+    stream << quint8(easing.d_ptr->type);
+    stream << quint64(quintptr(easing.d_ptr->func));
+
+    bool hasConfig = easing.d_ptr->config;
+    stream << hasConfig;
+    if (hasConfig) {
+        stream << easing.d_ptr->config->_p;
+        stream << easing.d_ptr->config->_a;
+        stream << easing.d_ptr->config->_o;
+    }
+    return stream;
+}
+
+/*!
+    \fn QDataStream &operator>>(QDataStream &stream, QEasingCurve &easing)
+    \relates QQuaternion
+
+    Reads an easing curve from the given \a stream into the given \a
+    easing curve and returns a reference to the stream.
+
+    \sa {Serializing Qt Data Types}
+*/
+
+QDataStream &operator>>(QDataStream &stream, QEasingCurve &easing)
+{
+    QEasingCurve::Type type;
+    quint8 int_type;
+    stream >> int_type;
+    type = static_cast<QEasingCurve::Type>(int_type);
+    easing.setType(type);
+
+    quint64 ptr_func;
+    stream >> ptr_func;
+    easing.d_ptr->func = QEasingCurve::EasingFunction(quintptr(ptr_func));
+
+    bool hasConfig;
+    stream >> hasConfig;
+    if (hasConfig) {
+        QEasingCurveFunction *config = curveToFunctionObject(type);
+        stream >> config->_p;
+        stream >> config->_a;
+        stream >> config->_o;
+        easing.d_ptr->config = config;
+    }
+    return stream;
+}
+#endif // QT_NO_DATASTREAM
 
 QT_END_NAMESPACE