QCameraPrivate Class Reference

#include <qcamera_p.h>

Inheritance diagram for QCameraPrivate:

Collaboration diagram for QCameraPrivate:

Public Member Functions
void	init (const QCameraDevice &device)
void	_q_error (int error, const QString &errorString)
	\qmltype Camera \instantiates QCamera \inqmlmodule QtMultimedia
void	unsetError ()
Public Member Functions inherited from QObjectPrivate
void	ensureExtraData ()
	QObjectPrivate (int version=QObjectPrivateVersion)
virtual	~QObjectPrivate ()
void	deleteChildren ()
void	clearBindingStorage ()
void	checkForIncompatibleLibraryVersion (int version) const
void	setParent_helper (QObject *)
void	moveToThread_helper ()
void	setThreadData_helper (QThreadData *currentData, QThreadData *targetData, QBindingStatus *status)
QObjectList	receiverList (const char *signal) const
void	ensureConnectionData ()
void	addConnection (int signal, Connection *c)
int	signalIndex (const char *signalName, const QMetaObject **meta=nullptr) const
bool	isSignalConnected (uint signalIdx, bool checkDeclarative=true) const
bool	maybeSignalConnected (uint signalIndex) const
bool	isDeclarativeSignalConnected (uint signalIdx) const
void	connectNotify (const QMetaMethod &signal)
void	disconnectNotify (const QMetaMethod &signal)
void	reinitBindingStorageAfterThreadMove ()
virtual std::string	flagsForDumping () const
virtual void	writeToDebugStream (QDebug &) const
QtPrivate::QPropertyAdaptorSlotObject *	getPropertyAdaptorSlotObject (const QMetaProperty &property)
Public Member Functions inherited from QObjectData
	QObjectData ()=default
virtual	~QObjectData ()=0
QMetaObject *	dynamicMetaObject () const

Public Attributes
QMediaCaptureSession *	captureSession = nullptr
QPlatformCamera *	control = nullptr
QErrorInfo< QCamera::Error >	error
QCameraDevice	cameraDevice
QCameraFormat	cameraFormat
Public Attributes inherited from QObjectPrivate
ExtraData *	extraData
QAtomicPointer< QThreadData >	threadData
QAtomicPointer< ConnectionData >	connections
union {
QObject *   currentChildBeingDeleted
QAbstractDeclarativeData *   declarativeData
};
QAtomicPointer< QtSharedPointer::ExternalRefCountData >	sharedRefcount
Public Attributes inherited from QObjectData
QObject *	q_ptr
QObject *	parent
QObjectList	children
uint	isWidget: 1
uint	blockSig: 1
uint	wasDeleted: 1
uint	isDeletingChildren: 1
uint	sendChildEvents: 1
uint	receiveChildEvents: 1
uint	isWindow: 1
uint	deleteLaterCalled: 1
uint	isQuickItem: 1
uint	willBeWidget: 1
uint	wasWidget: 1
uint	receiveParentEvents: 1
uint	unused: 20
QAtomicInt	postedEvents
QDynamicMetaObjectData *	metaObject
QBindingStorage	bindingStorage

Additional Inherited Members
Public Types inherited from QObjectPrivate
typedef void(*	StaticMetaCallFunction) (QObject *, QMetaObject::Call, int, void **)
using	ConnectionDataPointer = QExplicitlySharedDataPointer<ConnectionData>
Static Public Member Functions inherited from QObjectPrivate
static bool	removeConnection (Connection *c)
static QObjectPrivate *	get (QObject *o)
static const QObjectPrivate *	get (const QObject *o)
template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiverPrivate, Func2 slot, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiverPrivate, Func2 slot)
static QMetaObject::Connection	connectImpl (const QObject *sender, int signal_index, const QObject *receiver, void **slot, QtPrivate::QSlotObjectBase *slotObj, int type, const int *types, const QMetaObject *senderMetaObject)
static QMetaObject::Connection	connect (const QObject *sender, int signal_index, QtPrivate::QSlotObjectBase *slotObj, Qt::ConnectionType type)
static QMetaObject::Connection	connect (const QObject *sender, int signal_index, const QObject *receiver, QtPrivate::QSlotObjectBase *slotObj, Qt::ConnectionType type)
static bool	disconnect (const QObject *sender, int signal_index, void **slot)
static bool	disconnect (const QObject *sender, int signal_index, const QObject *receiver, void **slot)

Detailed Description

Definition at line 28 of file qcamera_p.h.

Member Function Documentation

_q_error()

void QCameraPrivate::_q_error	(	int	error,
		const QString &	errorString )

\qmltype Camera \instantiates QCamera \inqmlmodule QtMultimedia

An interface for camera settings related to focus and zoom.

The Camera element can be used within a \l CaptureSession for video recording and image taking.

You can use \l MediaDevices to list available cameras and choose which one to use.

\qml MediaDevices { id: mediaDevices } CaptureSession { camera: Camera { cameraDevice: mediaDevices.defaultVideoInput } } \endqml

On hardware that supports it, QCamera lets you adjust the focus and zoom. This also includes functionality such as a "Macro" mode for close up work (e.g. reading barcodes, or recognizing letters), or "touch to focus" - indicating an interesting area of the image for the hardware to attempt to focus on.

\qml

Item { width: 640 height: 360

CaptureSession { camera: Camera { id: camera

focusMode: Camera.FocusModeAutoNear customFocusPoint: Qt.point(0.2, 0.2) // Focus relative to top-left corner } videoOutput: videoOutput }

VideoOutput { id: videoOutput anchors.fill: parent } }

\endqml

The \l minimumZoomFactor and \l maximumZoomFactor properties provide the range of supported zoom factors. The \l zoomFactor property allows changing the zoom factor.

\qml Camera { zoomFactor: maximumZoomFactor // zoom in as much as possible } \endqml

After capturing the raw data for a camera frame, the camera hardware and software performs various image processing tasks to produce the final image. This includes compensating for ambient light color, reducing noise, as well as making some other adjustments to the image.

You can control many of these processing steps through the Camera properties. For example, you can set the white balance (or color temperature) used for processing images:

\qml Camera { whiteBalanceMode: Camera.WhiteBalanceManual colorTemperature: 5600 } \endqml

For more information on image processing of camera frames, see \l {camera_image_processing}{Camera Image Processing}.

See the \l{Camera Overview}{camera overview} for more information.

Definition at line 156 of file qcamera.cpp.

References error.

Referenced by init().

Here is the caller graph for this function:

init()

void QCameraPrivate::init

(

const QCameraDevice &

device

)

Definition at line 163 of file qcamera.cpp.

References _q_error(), QCamera::activeChanged(), QPlatformVideoSource::activeChanged(), cameraDevice, QCamera::CameraError, control, QMediaDevices::defaultVideoInput, device, error, QPlatformMediaIntegration::instance(), QCameraDevice::isNull(), QStringLiteral, qWarning, QPlatformCamera::setCamera(), SIGNAL, and SLOT.

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unsetError()

void QCameraPrivate::unsetError ( )

inline

Definition at line 43 of file qcamera_p.h.

References error.

Member Data Documentation

cameraDevice

QCameraDevice QCameraPrivate::cameraDevice

Definition at line 39 of file qcamera_p.h.

Referenced by init().

cameraFormat

QCameraFormat QCameraPrivate::cameraFormat

Definition at line 40 of file qcamera_p.h.

captureSession

QMediaCaptureSession* QCameraPrivate::captureSession = nullptr

Definition at line 34 of file qcamera_p.h.

control

QPlatformCamera* QCameraPrivate::control = nullptr

Definition at line 35 of file qcamera_p.h.

Referenced by init().

error

QErrorInfo<QCamera::Error> QCameraPrivate::error

Definition at line 37 of file qcamera_p.h.

Referenced by _q_error(), init(), and unsetError().

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The documentation for this class was generated from the following files:

• qtmultimedia/src/multimedia/camera/qcamera_p.h (a69450f5e12d3cd0ff3367980c2fa9f4ab205457)
• qtmultimedia/src/multimedia/camera/qcamera.cpp (1d962ce5193d9a79eb23010eaa72f6b7a6fd991e)