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Qt 6.x
The Qt SDK
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Qt 6.x
The Qt SDK
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The QPixmapConvolutionFilter class provides convolution filtering for pixmaps. More...
#include <qpixmapfilter_p.h>
Inheritance diagram for QPixmapConvolutionFilter: Collaboration diagram for QPixmapConvolutionFilter:Public Member Functions | |
| QPixmapConvolutionFilter (QObject *parent=nullptr) | |
| Constructs a pixmap convolution filter. | |
| ~QPixmapConvolutionFilter () | |
| Destructor of pixmap convolution filter. | |
| void | setConvolutionKernel (const qreal *matrix, int rows, int columns) |
| Sets convolution kernel with the given number of rows and columns. | |
| 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. | |
| virtual QRectF | boundingRectFor (const QRectF &rect) const |
| Returns the bounding rectangle that is affected by the pixmap filter if the filter is applied to the specified rect. | |
| virtual void | draw (QPainter *painter, const QPointF &p, const QPixmap &src, const QRectF &srcRect=QRectF()) const =0 |
| Uses painter to draw filtered result of src at the point specified by p. | |
| 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. | |
| void | moveToThread (QThread *thread) |
| Changes the thread affinity for this object and its children. | |
| 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::milliseconds time, Qt::TimerType timerType=Qt::CoarseTimer) |
| void | killTimer (int id) |
| Kills the timer with timer identifier, id. | |
| template<typename T > | |
| T | findChild (const QString &aName=QString(), 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 (const QString &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 > | |
| 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. | |
Friends | |
| class | QVGPixmapConvolutionFilter |
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 | |
| template< class T > T | qobject_cast (const QObject *object) |
| Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr. | |
| template< typename T > T | qFindChildqFindChildren (const QObject *obj, const QString &name)() |
| template< typename T > QList< T > | qFindChildrenqFindChildren (const QObject *obj, const QString &name)() |
| QObjectList | |
| \macro Q_CLASSINFO(Name, Value) | |
The QPixmapConvolutionFilter class provides convolution filtering for pixmaps.
QPixmapConvolutionFilter implements a convolution pixmap filter, which is applied when \l{QPixmapFilter::}{draw()} is called. A convolution filter lets you distort an image by setting the values of a matrix of qreal values called its \l{setConvolutionKernel()}{kernel}. The matrix's values are usually between -1.0 and 1.0.
\omit In convolution filtering, the pixel value is calculated from the neighboring pixels based on the weighting convolution kernel. This needs explaining to be useful. \endomit
Example:
Definition at line 61 of file qpixmapfilter_p.h.
Constructs a pixmap convolution filter.
By default there is no convolution kernel.
Definition at line 194 of file qpixmapfilter.cpp.
References d.
| QPixmapConvolutionFilter::~QPixmapConvolutionFilter | ( | ) |
Destructor of pixmap convolution filter.
Definition at line 206 of file qpixmapfilter.cpp.
Reimplemented from QPixmapFilter.
Definition at line 268 of file qpixmapfilter.cpp.
Referenced by draw().
Here is the caller graph for this function:
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overridevirtual |
Implements QPixmapFilter.
Definition at line 377 of file qpixmapfilter.cpp.
References boundingRectFor(), QRasterPaintEngine::clipBoundingRect(), QRasterPaintEngine::clipType(), QPainter::combinedTransform(), QRasterPaintEngine::ComplexClip, QPainter::CompositionMode_Source, QPainter::CompositionMode_SourceOver, QRectF::contains(), convolute(), d, QPainter::deviceTransform(), QPaintDevice::devType(), QPainter::drawImage(), QImage::Format_ARGB32_Premultiplied, QInternal::Image, QPainter::isActive(), QRectF::isEmpty(), QRectF::isNull(), QPaintEngine::paintDevice(), QPainter::paintEngine(), painter, rect, QRect::topLeft(), QRectF::toRect(), QTransform::TxTranslate, and QTransform::type().
Here is the call graph for this function:Sets convolution kernel with the given number of rows and columns.
Values from kernel are copied to internal data structure.
To preserve the intensity of the pixmap, the sum of all the values in the convolution kernel should add up to 1.0. A sum greater than 1.0 produces a lighter result and a sum less than 1.0 produces a darker and transparent result.
Definition at line 221 of file qpixmapfilter.cpp.
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friend |
Definition at line 76 of file qpixmapfilter_p.h.
1.9.7