Add the spot for spot metering mode.

Not yet fully documented in QML - needs a bit of an overhaul first.

Change-Id: Ic11684858fb872d0b4dcedf60b390571371db252
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/multimedia/camera/qcameraexposure.cpp

@@ -311,6 +311,33 @@ void QCameraExposure::setMeteringMode(QCameraExposure::MeteringMode mode)
         d_func()->exposureControl->setMeteringMode(mode);
 }
 
+/*!
+  \property QCameraExposure::spotMeteringPoint
+
+  When supported, this property is the (normalized) position of the point of the image
+  where exposure metering will be performed.  This is typically used to indicate an
+  "interesting" area of the image that should be exposed properly.
+
+  The coordinates are relative frame coordinates:
+  QPointF(0,0) points to the left top frame point, QPointF(0.5,0.5) points to the frame center,
+  which is typically the default spot metering point.
+
+  The spot metering point is only used with spot metering mode.
+  \since 1.1
+ */
+
+QPointF QCameraExposure::spotMeteringPoint() const
+{
+    return d_func()->exposureControl ? d_func()->exposureControl->exposureParameter(QCameraExposureControl::SpotMeteringPoint).toPointF() : QPointF();
+}
+
+void QCameraExposure::setSpotMeteringPoint(const QPointF &point)
+{
+    if (d_func()->exposureControl)
+        d_func()->exposureControl->setExposureParameter(QCameraExposureControl::SpotMeteringPoint, point);
+}
+
+
 /*!
     Returns true if the metering \a mode is supported.
     \since 1.1

src/multimedia/camera/qcameraexposure.h

@@ -120,6 +120,9 @@ public:
 
     bool isMeteringModeSupported(MeteringMode mode) const;
 
+    QPointF spotMeteringPoint() const;
+    void setSpotMeteringPoint(const QPointF &point);
+
     int isoSensitivity() const;
     QList<int> supportedIsoSensitivities(bool *continuous = 0) const;