The QPixmapBlurFilter class provides blur filtering for pixmaps. More...

#include <qpixmapfilter_p.h>

Inheritance diagram for QPixmapBlurFilter:

Public Functions
QGraphicsBlurEffect::BlurHints	blurHints () const
	Gets the blur hints of the blur filter. More...

QRectF	boundingRectFor (const QRectF &rect) const

void	draw (QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect=QRectF()) const

	QPixmapBlurFilter (QObject *parent=0)
	Constructs a pixmap blur filter. More...

qreal	radius () const
	Gets the radius of the blur filter. More...

void	setBlurHints (QGraphicsBlurEffect::BlurHints hints)
	Setting the blur hints to PerformanceHint causes the implementation to trade off visual quality to blur the image faster. More...

void	setRadius (qreal radius)
	Sets the radius of the blur filter. More...

	~QPixmapBlurFilter ()
	Destructor of pixmap blur filter. More...

Public Functions inherited from QPixmapFilter
FilterType	type () const
	Returns the type of the filter. More...

virtual	~QPixmapFilter ()=0
	Destroys the pixmap filter. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Friends
class	QGLPixmapBlurFilter

Additional Inherited Members
Public Types inherited from QPixmapFilter
enum	FilterType { ConvolutionFilter, ColorizeFilter, DropShadowFilter, BlurFilter, UserFilter = 1024 }
	This enum describes the types of filter that can be applied to pixmaps. More...

Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Functions inherited from QPixmapFilter
	QPixmapFilter (QPixmapFilterPrivate &d, FilterType type, QObject *parent)

	QPixmapFilter (FilterType type, QObject *parent)
	Constructs a default QPixmapFilter with the given type. More...

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

The QPixmapBlurFilter class provides blur filtering for pixmaps.

Since: 4.6

QPixmapBlurFilter implements a blur pixmap filter, which is applied when QPixmapFilter::draw() is called.

The filter lets you specialize the radius of the blur as well as hints as to whether to prefer performance or quality.

By default, the blur effect is produced by applying an exponential filter generated from the specified blurRadius(). Paint engines may override this with a custom blur that is faster on the underlying hardware.

See also: {Pixmap Filters Example}, QPixmapConvolutionFilter, QPixmapDropShadowFilter

Warning: This function is not part of the public interface.

Definition at line 125 of file qpixmapfilter_p.h.

Constructors and Destructors

◆ QPixmapBlurFilter()

QPixmapBlurFilter::QPixmapBlurFilter ( QObject * parent = 0 )

Constructs a pixmap blur filter.

Warning: This function is not part of the public interface.

Definition at line 539 of file qpixmapfilter.cpp.

     : QPixmapFilter(*new QPixmapBlurFilterPrivate, BlurFilter, parent)
 {
 }

◆ ~QPixmapBlurFilter()

QPixmapBlurFilter::~QPixmapBlurFilter ( )

Destructor of pixmap blur filter.

Warning: This function is not part of the public interface.

Definition at line 549 of file qpixmapfilter.cpp.

550 {

551 }

Functions

◆ blurHints()

QGraphicsBlurEffect::BlurHints QPixmapBlurFilter::blurHints ( ) const

Gets the blur hints of the blur filter.

Warning: This function is not part of the public interface.

Definition at line 601 of file qpixmapfilter.cpp.

 {
     Q_D(const QPixmapBlurFilter);
     return d->hints;
 }

◆ boundingRectFor()

QRectF QPixmapBlurFilter::boundingRectFor ( const QRectF & rect ) const

virtual

Warning: This function is not part of the public interface.

Reimplemented from QPixmapFilter.

Definition at line 612 of file qpixmapfilter.cpp.

 {
     Q_D(const QPixmapBlurFilter);
     const qreal delta = radiusScale * d->radius + 1;
     return rect.adjusted(-delta, -delta, delta, delta);
 }

◆ draw()

void QPixmapBlurFilter::draw	(	QPainter *	painter,
		const QPointF &	p,
		const QPixmap &	src,
		const QRectF &	rect = `QRectF()`
	)		const

virtual

Warning: This function is not part of the public interface.

Implements QPixmapFilter.

Reimplemented in QVGPixmapBlurFilter, and QGLPixmapFilter< QPixmapBlurFilter >.

Definition at line 925 of file qpixmapfilter.cpp.

Referenced by QVGPixmapBlurFilter::draw(), and draw().

 {
     Q_D(const QPixmapBlurFilter);
     if (!painter->isActive())
         return;
 
     if (src.isNull())
         return;
 
     QRectF srcRect = rect;
     if (srcRect.isNull())
         srcRect = src.rect();
 
     if (d->radius <= 1) {
         painter->drawPixmap(srcRect.translated(p), src, srcRect);
         return;
     }
 
     qreal scaledRadius = radiusScale * d->radius;
     qreal scale;
     if (qt_scaleForTransform(painter->transform(), &scale))
         scaledRadius /= scale;
 
     QPixmapFilter *filter = painter->paintEngine() && painter->paintEngine()->isExtended() ?
         static_cast<QPaintEngineEx *>(painter->paintEngine())->pixmapFilter(type(), this) : 0;
     QPixmapBlurFilter *blurFilter = static_cast<QPixmapBlurFilter*>(filter);
     if (blurFilter) {
         blurFilter->setRadius(scaledRadius);
         blurFilter->setBlurHints(d->hints);
         blurFilter->draw(painter, p, src, srcRect);
         return;
     }
 
     QImage srcImage;
     QImage destImage;
 
     if (srcRect == src.rect()) {
         srcImage = src.toImage();
     } else {
         QRect rect = srcRect.toAlignedRect().intersected(src.rect());
         srcImage = src.copy(rect).toImage();
     }
 
     QTransform transform = painter->worldTransform();
     painter->translate(p);
     qt_blurImage(painter, srcImage, scaledRadius, (d->hints & QGraphicsBlurEffect::QualityHint), false);
     painter->setWorldTransform(transform);
 }

◆ radius()

qreal QPixmapBlurFilter::radius ( ) const

Gets the radius of the blur filter.

Warning: This function is not part of the public interface.

Definition at line 569 of file qpixmapfilter.cpp.

Referenced by QVGPixmapBlurFilter::draw(), qt_blurImage(), and setRadius().

 {
     Q_D(const QPixmapBlurFilter);
     return d->radius;
 }

◆ setBlurHints()

void QPixmapBlurFilter::setBlurHints ( QGraphicsBlurEffect::BlurHints hints )

Setting the blur hints to PerformanceHint causes the implementation to trade off visual quality to blur the image faster.

Setting the blur hints to QualityHint causes the implementation to improve visual quality at the expense of speed.

AnimationHint causes the implementation to optimize for animating the blur radius, possibly by caching blurred versions of the source pixmap.

The implementation is free to ignore this value if it only has a single blur algorithm.

Warning: This function is not part of the public interface.

Definition at line 590 of file qpixmapfilter.cpp.

Referenced by draw().

 {
     Q_D(QPixmapBlurFilter);
     d->hints = hints;
 }

◆ setRadius()

void QPixmapBlurFilter::setRadius ( qreal radius )

Sets the radius of the blur filter.

Higher radius produces increased blurriness.

Warning: This function is not part of the public interface.

Definition at line 558 of file qpixmapfilter.cpp.

Referenced by draw().

 {
     Q_D(QPixmapBlurFilter);
     d->radius = radius;
 }

Friends and Related Functions

◆ QGLPixmapBlurFilter

friend class QGLPixmapBlurFilter

friend

Definition at line 144 of file qpixmapfilter_p.h.

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

/src/gui/image/qpixmapfilter_p.h
/src/gui/image/qpixmapfilter.cpp

Public Functions

Friends

Additional Inherited Members