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Internal/Contributor docs for the Qt SDK. <b>Note:</b> These are NOT official API docs; those are found <a href='https://doc.qt.io/'>here</a>.
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Public Member Functions | List of all members
QPixmapBlurFilter Class Reference

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

#include <qpixmapfilter_p.h>

+ Inheritance diagram for QPixmapBlurFilter:
+ Collaboration diagram for QPixmapBlurFilter:

Public Member Functions

 QPixmapBlurFilter (QObject *parent=nullptr)
 Constructs a pixmap blur filter.
 
 ~QPixmapBlurFilter ()
 Destructor of pixmap blur filter.
 
void setRadius (qreal radius)
 Sets the radius of the blur filter.
 
void setBlurHints (QGraphicsBlurEffect::BlurHints hints)
 Setting the blur hints to PerformanceHint causes the implementation to trade off visual quality to blur the image faster.
 
qreal radius () const
 Gets the radius of the blur filter.
 
QGraphicsBlurEffect::BlurHints blurHints () const
 Gets the blur hints of the blur filter.
 
QRectF boundingRectFor (const QRectF &rect) const override
 
void draw (QPainter *painter, const QPointF &dest, const QPixmap &src, const QRectF &srcRect=QRectF()) const override
 
- Public Member Functions inherited from QPixmapFilter
virtual ~QPixmapFilter ()=0
 Destroys the pixmap filter.
 
FilterType type () const
 Returns the type of the filter.
 
- Public Member Functions inherited from QObject
Q_INVOKABLE QObject (QObject *parent=nullptr)
 Constructs an object with parent object parent.
 
virtual ~QObject ()
 Destroys the object, deleting all its child objects.
 
virtual bool event (QEvent *event)
 This virtual function receives events to an object and should return true if the event e was recognized and processed.
 
virtual bool eventFilter (QObject *watched, QEvent *event)
 Filters events if this object has been installed as an event filter for the watched object.
 
QString objectName () const
 
Q_WEAK_OVERLOAD void setObjectName (const QString &name)
 Sets the object's name to name.
 
void setObjectName (QAnyStringView name)
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
QBindable< QString > bindableObjectName ()
 
bool isWidgetType () const
 Returns true if the object is a widget; otherwise returns false.
 
bool isWindowType () const
 Returns true if the object is a window; otherwise returns false.
 
bool isQuickItemType () const
 Returns true if the object is a QQuickItem; otherwise returns false.
 
bool signalsBlocked () const noexcept
 Returns true if signals are blocked; otherwise returns false.
 
bool blockSignals (bool b) noexcept
 If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).
 
QThread * thread () const
 Returns the thread in which the object lives.
 
bool moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
 Changes the thread affinity for this object and its children and returns true on success.
 
int startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
 This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.
 
int startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)
 
void killTimer (int id)
 Kills the timer with timer identifier, id.
 
void killTimer (Qt::TimerId id)
 
template<typename T >
T findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.
 
template<typename T >
QList< T > findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) 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.
 
template<typename T >
T findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
template<typename T >
QList< T > findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
 
const QObjectList & children () const
 Returns a list of child objects.
 
void setParent (QObject *parent)
 Makes the object a child of parent.
 
void installEventFilter (QObject *filterObj)
 Installs an event filter filterObj on this object.
 
void removeEventFilter (QObject *obj)
 Removes an event filter object obj from this object.
 
QMetaObject::Connection connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
 
bool disconnect (const char *signal=nullptr, const QObject *receiver=nullptr, const char *member=nullptr) const
 
bool disconnect (const QObject *receiver, const char *member=nullptr) const
 
void dumpObjectTree () const
 Dumps a tree of children to the debug output.
 
void dumpObjectInfo () const
 Dumps information about signal connections, etc.
 
bool setProperty (const char *name, const QVariant &value)
 Sets the value of the object's name property to value.
 
bool setProperty (const char *name, QVariant &&value)
 
QVariant property (const char *name) const
 Returns the value of the object's name property.
 
QList< QByteArray > dynamicPropertyNames () const
 
QBindingStorage * bindingStorage ()
 
const QBindingStorage * bindingStorage () const
 
QObject * parent () const
 Returns a pointer to the parent object.
 
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.
 

Additional Inherited Members

- Public Types inherited from QPixmapFilter
enum  FilterType {
  ConvolutionFilter , ColorizeFilter , DropShadowFilter , BlurFilter ,
  UserFilter = 1024
}
 
- Public Slots inherited from QObject
void deleteLater ()
 \threadsafe
 
- Signals inherited from QObject
void destroyed (QObject *=nullptr)
 This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.
 
void objectNameChanged (const QString &objectName, QPrivateSignal)
 This signal is emitted after the object's name has been changed.
 
- Static Public Member Functions inherited from QObject
static QMetaObject::Connection connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
 \threadsafe
 
static QMetaObject::Connection connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
 
template<typename Func1 , typename Func2 >
static QMetaObject::Connection connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType *context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)
 
template<typename Func1 , typename Func2 >
static QMetaObject::Connection connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)
 
static bool disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
 \threadsafe
 
static bool disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
 
static bool disconnect (const QMetaObject::Connection &)
 Disconnect a connection.
 
template<typename Func1 , typename Func2 >
static bool disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiver, Func2 slot)
 
template<typename Func1 >
static bool disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const QObject *receiver, void **zero)
 
- Protected Member Functions inherited from QPixmapFilter
 QPixmapFilter (QPixmapFilterPrivate &d, FilterType type, QObject *parent)
 
 QPixmapFilter (FilterType type, QObject *parent)
 Constructs a default QPixmapFilter with the given type.
 
- Protected Member Functions inherited from QObject
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 \nullptr.
 
int senderSignalIndex () const
 
int receivers (const char *signal) const
 Returns the number of receivers connected to the signal.
 
bool isSignalConnected (const QMetaMethod &signal) const
 
virtual void timerEvent (QTimerEvent *event)
 This event handler can be reimplemented in a subclass to receive timer events for the object.
 
virtual void childEvent (QChildEvent *event)
 This event handler can be reimplemented in a subclass to receive child events.
 
virtual void customEvent (QEvent *event)
 This event handler can be reimplemented in a subclass to receive custom events.
 
virtual void connectNotify (const QMetaMethod &signal)
 
virtual void disconnectNotify (const QMetaMethod &signal)
 
 QObject (QObjectPrivate &dd, QObject *parent=nullptr)
 
- Protected Attributes inherited from QObject
QScopedPointer< QObjectData > d_ptr
 
- Properties inherited from QObject
QString objectName
 the name of this object
 
- Related Symbols inherited from QObject
 Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.
 
 
 
 \macro Q_CLASSINFO(Name, Value)
 

Detailed Description

The QPixmapBlurFilter class provides blur filtering for pixmaps.

Since
4.6

QPixmapBlurFilter implements a blur pixmap filter, which is applied when \l{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

Definition at line 84 of file qpixmapfilter_p.h.

Constructor & Destructor Documentation

◆ QPixmapBlurFilter()

QPixmapBlurFilter::QPixmapBlurFilter ( QObject * parent = nullptr)

Constructs a pixmap blur filter.

Definition at line 477 of file qpixmapfilter.cpp.

◆ ~QPixmapBlurFilter()

QPixmapBlurFilter::~QPixmapBlurFilter ( )

Destructor of pixmap blur filter.

Definition at line 487 of file qpixmapfilter.cpp.

Member Function Documentation

◆ blurHints()

QGraphicsBlurEffect::BlurHints QPixmapBlurFilter::blurHints ( ) const

Gets the blur hints of the blur filter.

Definition at line 539 of file qpixmapfilter.cpp.

References d.

◆ boundingRectFor()

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

Reimplemented from QPixmapFilter.

Definition at line 550 of file qpixmapfilter.cpp.

References d, radiusScale, and rect.

◆ draw()

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

Implements QPixmapFilter.

Definition at line 564 of file qpixmapfilter.cpp.

References d, QPainter::drawPixmap(), QRect::intersected(), QPainter::isActive(), painter, qt_blurImage(), qt_scaleForTransform(), QGraphicsBlurEffect::QualityHint, radiusScale, rect, QPainter::setWorldTransform(), QPainter::transform(), QPainter::translate(), and QPainter::worldTransform().

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◆ radius()

qreal QPixmapBlurFilter::radius ( ) const

Gets the radius of the blur filter.

Definition at line 507 of file qpixmapfilter.cpp.

References d.

Referenced by setRadius().

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◆ 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.

Definition at line 528 of file qpixmapfilter.cpp.

References d.

◆ setRadius()

void QPixmapBlurFilter::setRadius ( qreal radius)

Sets the radius of the blur filter.

Higher radius produces increased blurriness.

Definition at line 496 of file qpixmapfilter.cpp.

References d, and radius().

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