Allows controlling camera exposure parameters. More...

Inheritance diagram for QCameraExposureControl:

Public Types
enum	ExposureParameter

Public Signals
void	actualValueChanged (int parameter)

void	parameterRangeChanged (int parameter)

void	requestedValueChanged (int parameter)

Public Signals inherited from QObject
void	destroyed (QObject *obj=nullptr)

void	objectNameChanged (const QString &objectName)

Public Methods
	~QCameraExposureControl ()

virtual QVariant	actualValue (ExposureParameter parameter) const = 0

virtual bool	isParameterSupported (ExposureParameter parameter) const = 0

virtual QVariant	requestedValue (ExposureParameter parameter) const = 0

virtual bool	setValue (ExposureParameter parameter, const QVariant &value) = 0

virtual QVariantList	supportedParameterRange (ExposureParameter parameter, bool *continuous) const = 0

Public Methods inherited from QMediaControl
	~QMediaControl ()

Public Methods inherited from QObject
	QObject (QObject *parent=nullptr)

	~QObject ()

bool	blockSignals (bool block)

const QList< QObject * > &	children () const

bool	connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

void	dumpObjectInfo ()

void	dumpObjectTree ()

QList< QString >	dynamicPropertyNames () const

virtual bool	event (QEvent *event)

virtual bool	eventFilter (QObject watched, QEvent event)

template<typename T >
T	findChild (const QString &childName=QString ()) const

template<class T >
QList< T >	findChildren (const QRegularExpression &regExp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

template<class T >
QList< T >	findChildren (const QString &childName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

bool	inherits (const QString &className) const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const

bool	isWindowType () const

void	killTimer (int id)

const QMetaObject *	metaObject () const

void	moveToThread (QThread *targetThread)

QString	objectName () const

QObject *	parent () const

template<class T = QVariant>
T	property (const QString &name) const

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const QString &name, const QVariant &value)

bool	signalsBlocked () const

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)

QThread *	thread () const

Protected Methods
	QCameraExposureControl (QObject *parent=nullptr)

Protected Methods inherited from QMediaControl
	QMediaControl (QObject *parent=nullptr)

Protected Methods inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signalMethod) const

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signalMethod) const

bool	isSignalConnected (const QMetaMethod &signalMethod) const

int	receivers (const QString &signal) const

QObject *	sender () const

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *event)

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()

Static Public Methods inherited from QObject
static bool	connect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

static bool	connect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ())

static bool	connect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, std::nullptr_t, const QObject receiver, std::nullptr_t)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...))

template<class Sender , class SignalClass , class... SignalArgs, class Receiver >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod)

static QMetaObject &	staticMetaObject ()

static QString	tr (const char text, const char comment=nullptr, std::optional< int > numArg=std::optional< int >())

Properties inherited from QObject
	objectName

Related Functions inherited from QObject
T	qobject_cast (QObject *object)

	QObjectList

Detailed Description

The QCameraExposureControl class allows controlling camera exposure parameters. The QCameraExposure class is the usual method of adjusting exposure related parameters when using camera functionality. This class provides a more complete but less easy to use interface, and also forms the interface to implement when writing a new implementation of QCamera functionality.

You can adjust a number of parameters that will affect images and video taken with the corresponding QCamera object - see the ExposureParameter enumeration.

The interface name of QCameraExposureControl is "com.copperspice.CS.cameraExposureControl/1.0" as defined in QCameraExposureControl_iid.

See also: QCameraExposure, QCamera

Member Enumeration Documentation

enum QCameraExposureControl::ExposureParameter

This enum specifies parameters used by the camera when capturing an image.

Constant	Value	Description
QCameraExposureControl::ISO	0	Camera ISO sensitivity, specified as integer value.
QCameraExposureControl::Aperture	1	Lens aperture is specified as an qreal F number. The supported apertures list can change depending on the focal length, in such a case the exposureParameterRangeChanged() signal is emitted.
QCameraExposureControl::ShutterSpeed	2	Shutter speed in seconds, specified as qreal.
QCameraExposureControl::ExposureCompensation	3	Exposure compensation, specified as qreal EV value.
QCameraExposureControl::FlashPower	4	Manual flash power, specified as qreal value. Accepted power range is [0..1.0], with 0 value means no flash and 1.0 corresponds to full flash power. This value is only used in the manual flash mode.
QCameraExposureControl::TorchPower	6	Manual torch power, specified as qreal value. Accepted power range is [0..1.0], with 0 value means no light and 1.0 corresponds to full torch power. This value is only used in the torch flash mode.
QCameraExposureControl::FlashCompensation	5	Flash compensation, specified as qreal EV value.
QCameraExposureControl::SpotMeteringPoint	7	The relative frame coordinate of the point to use for exposure metering in spot metering mode, specified as a QPointF.
QCameraExposureControl::ExposureMode	8	Camera exposure mode.
QCameraExposureControl::MeteringMode	9	Camera metering mode.
QCameraExposureControl::ExtendedExposureParameter	1000	Base value for platform specific extended parameters. For these parameters the sequential values starting from ExtendedExposureParameter should be used.

See also: QCameraExposure::FlashMode

Constructor & Destructor Documentation

QCameraExposureControl::~QCameraExposureControl ( )

Destroys the camera exposure control object.

QCameraExposureControl::QCameraExposureControl ( QObject * parent = nullptr )

explicitprotected

Constructs a camera exposure control object with parent.

Method Documentation

QVariant QCameraExposureControl::actualValue ( ExposureParameter parameter ) const

pure virtual

Returns the actual exposure parameter value, or invalid QVariant() if the value is unknown or not supported.

The actual parameter value may differ for the requested one if automatic mode is selected or camera supports only limited set of values within the supported range.

void QCameraExposureControl::actualValueChanged ( int parameter )

signal

Signal emitted when the actual exposure parameter value has changed, usually in result of auto exposure algorithms or manual exposure parameter applied.

bool QCameraExposureControl::isParameterSupported ( ExposureParameter parameter ) const

pure virtual

Returns true is exposure parameter is supported by backend.

void QCameraExposureControl::parameterRangeChanged ( int parameter )

signal

Signal emitted when the supported range of exposure parameter values has changed.

QVariant QCameraExposureControl::requestedValue ( ExposureParameter parameter ) const

pure virtual

Returns the requested exposure parameter value.

void QCameraExposureControl::requestedValueChanged ( int parameter )

signal

Signal emitted when the requested exposure parameter value has changed, usually in result of setValue() call.

bool QCameraExposureControl::setValue	(	ExposureParameter	parameter,
		const QVariant &	value
	)

pure virtual

Set the exposure parameter to value. If a null or invalid QVariant is passed, backend should choose the value automatically, and if possible report the actual value to user with QCameraExposureControl::actualValue().

Returns true if parameter is supported and value is correct.

Set the exposure parameter to value. If a null or invalid QVariant is passed, backend should choose the value automatically, and if possible report the actual value to user with QCameraExposureControl::actualValue().

Returns true if parameter is supported and value is correct.

QVariantList QCameraExposureControl::supportedParameterRange	(	ExposureParameter	parameter,
		bool *	continuous
	)		const

pure virtual

Returns the list of supported parameter values.

If the camera supports arbitrary exposure parameter value within the supported range, continuous is set to true, otherwise continuous is set to false.

Returns the list of supported parameter values. If the camera supports arbitrary exposure parameter value within the supported range, continuous is set to true, otherwise continuous is set to false.

Public Types

Public Signals

Public Methods

Protected Methods

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Method Documentation