Qt 6.x
The Qt SDK
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Public Slots | Public Member Functions | List of all members
QSGOpenVGLayer Class Reference

#include <qsgopenvglayer.h>

+ Inheritance diagram for QSGOpenVGLayer:
+ Collaboration diagram for QSGOpenVGLayer:

Public Slots

void markDirtyTexture () override
 
void invalidated () override
 
- Public Slots inherited from QObject
void deleteLater ()
 \threadsafe
 

Public Member Functions

 QSGOpenVGLayer (QSGRenderContext *renderContext)
 
 ~QSGOpenVGLayer ()
 
QSize textureSize () const override
 Returns the size of the texture in pixels.
 
bool hasAlphaChannel () const override
 Returns true if the texture data contains an alpha channel.
 
bool hasMipmaps () const override
 Returns true if the texture data contains mipmap levels.
 
qint64 comparisonKey () const override
 Returns a key suitable for comparing textures.
 
bool updateTexture () override
 Call this function to explicitly update the dynamic texture.
 
void setItem (QSGNode *item) override
 
void setRect (const QRectF &rect) override
 
void setSize (const QSize &size) override
 
void scheduleUpdate () override
 
QImage toImage () const override
 
void setLive (bool live) override
 
void setRecursive (bool recursive) override
 
void setFormat (uint format) override
 
void setHasMipmaps (bool mipmap) override
 
void setDevicePixelRatio (qreal ratio) override
 
void setMirrorHorizontal (bool mirror) override
 
void setMirrorVertical (bool mirror) override
 
void setSamples (int) override
 
- Public Member Functions inherited from QSGLayer
 ~QSGLayer () override
 
virtual void setItem (QSGNode *item)=0
 
virtual void setRect (const QRectF &logicalRect)=0
 
virtual void setSize (const QSize &pixelSize)=0
 
virtual void scheduleUpdate ()=0
 
virtual QImage toImage () const =0
 
virtual void setLive (bool live)=0
 
virtual void setRecursive (bool recursive)=0
 
virtual void setFormat (Format format)=0
 
virtual void setHasMipmaps (bool mipmap)=0
 
virtual void setDevicePixelRatio (qreal ratio)=0
 
virtual void setMirrorHorizontal (bool mirror)=0
 
virtual void setMirrorVertical (bool mirror)=0
 
virtual void setSamples (int samples)=0
 
virtual Q_SLOT void markDirtyTexture ()=0
 
virtual Q_SLOT void invalidated ()=0
 
- Public Member Functions inherited from QSGDynamicTexture
 QSGDynamicTexture ()=default
 
 ~QSGDynamicTexture () override
 
virtual bool updateTexture ()=0
 Call this function to explicitly update the dynamic texture.
 
- Public Member Functions inherited from QSGTexture
 QSGTexture ()
 Constructs the QSGTexture base class.
 
 ~QSGTexture () override
 Destroys the QSGTexture.
 
virtual qint64 comparisonKey () const =0
 Returns a key suitable for comparing textures.
 
virtual QRhiTexture * rhiTexture () const
 
virtual QSize textureSize () const =0
 Returns the size of the texture in pixels.
 
virtual bool hasAlphaChannel () const =0
 Returns true if the texture data contains an alpha channel.
 
virtual bool hasMipmaps () const =0
 Returns true if the texture data contains mipmap levels.
 
virtual QRectF normalizedTextureSubRect () const
 Returns the rectangle inside textureSize() that this texture represents in normalized coordinates.
 
virtual bool isAtlasTexture () const
 Returns whether this texture is part of an atlas or not.
 
virtual QSGTexture * removedFromAtlas (QRhiResourceUpdateBatch *resourceUpdates=nullptr) const
 This function returns a copy of the current texture which is removed from its atlas.
 
virtual void commitTextureOperations (QRhi *rhi, QRhiResourceUpdateBatch *resourceUpdates)
 Call this function to enqueue image upload operations to resourceUpdates, in case there are any pending ones.
 
void setMipmapFiltering (Filtering filter)
 Sets the mipmap sampling mode to filter.
 
QSGTexture::Filtering mipmapFiltering () const
 Returns whether mipmapping should be used when sampling from this texture.
 
void setFiltering (Filtering filter)
 Sets the sampling mode to filter.
 
QSGTexture::Filtering filtering () const
 Returns the sampling mode to be used for this texture.
 
void setAnisotropyLevel (AnisotropyLevel level)
 Sets the level of anisotropic filtering to level.
 
QSGTexture::AnisotropyLevel anisotropyLevel () const
 Returns the anisotropy level in use for filtering this texture.
 
void setHorizontalWrapMode (WrapMode hwrap)
 Sets the horizontal wrap mode to hwrap.
 
QSGTexture::WrapMode horizontalWrapMode () const
 Returns the horizontal wrap mode to be used for this texture.
 
void setVerticalWrapMode (WrapMode vwrap)
 Sets the vertical wrap mode to vwrap.
 
QSGTexture::WrapMode verticalWrapMode () const
 Returns the vertical wrap mode to be used for this texture.
 
QRectF convertToNormalizedSourceRect (const QRectF &rect) const
 Returns rect converted to normalized coordinates.
 
- 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.
 

Additional Inherited Members

- Public Types inherited from QSGLayer
enum  Format { RGBA8 = 1 , RGBA16F , RGBA32F }
 
- Public Types inherited from QSGTexture
enum  WrapMode { Repeat , ClampToEdge , MirroredRepeat }
 Specifies how the sampler should treat texture coordinates. More...
 
enum  Filtering { None , Nearest , Linear }
 Specifies how sampling of texels should filter when texture coordinates are not pixel aligned. More...
 
enum  AnisotropyLevel {
  AnisotropyNone , Anisotropy2x , Anisotropy4x , Anisotropy8x ,
  Anisotropy16x
}
 Specifies the anisotropic filtering level to be used when the texture is not screen aligned. More...
 
- Signals inherited from QSGLayer
void updateRequested ()
 
void scheduledUpdateCompleted ()
 
- 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 QSGLayer
 QSGLayer (QSGTexturePrivate &dd)
 
- Protected Member Functions inherited from QSGDynamicTexture
 QSGDynamicTexture (QSGTexturePrivate &dd)
 
- Protected Member Functions inherited from QSGTexture
 QSGTexture (QSGTexturePrivate &dd)
 
- 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)
 

Detailed Description

Definition at line 20 of file qsgopenvglayer.h.

Constructor & Destructor Documentation

◆ QSGOpenVGLayer()

QT_BEGIN_NAMESPACE QSGOpenVGLayer::QSGOpenVGLayer ( QSGRenderContext *  renderContext)

Definition at line 10 of file qsgopenvglayer.cpp.

◆ ~QSGOpenVGLayer()

QSGOpenVGLayer::~QSGOpenVGLayer ( )

Definition at line 27 of file qsgopenvglayer.cpp.

References invalidated().

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Member Function Documentation

◆ comparisonKey()

qint64 QSGOpenVGLayer::comparisonKey ( ) const
overridevirtual

Returns a key suitable for comparing textures.

Typically used in QSGMaterial::compare() implementations.

Just comparing QSGTexture pointers is not always sufficient because two QSGTexture instances that refer to the same native texture object underneath should also be considered equal. Hence the need for this function.

Implementations of this function are not expected to, and should not create any graphics resources (native texture objects) in case there are none yet.

A QSGTexture that does not have a native texture object underneath is typically not equal to any other QSGTexture, so the return value has to be crafted accordingly. There are exceptions to this, in particular when atlasing is used (where multiple textures share the same atlas texture under the hood), that is then up to the subclass implementations to deal with as appropriate.

Warning
This function can only be called from the rendering thread.
Since
5.14

Implements QSGTexture.

Definition at line 32 of file qsgopenvglayer.cpp.

References QOpenVGOffscreenSurface::image().

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◆ hasAlphaChannel()

bool QSGOpenVGLayer::hasAlphaChannel ( ) const
overridevirtual

Returns true if the texture data contains an alpha channel.

Implements QSGTexture.

Definition at line 49 of file qsgopenvglayer.cpp.

◆ hasMipmaps()

bool QSGOpenVGLayer::hasMipmaps ( ) const
overridevirtual

Returns true if the texture data contains mipmap levels.

Implements QSGTexture.

Definition at line 54 of file qsgopenvglayer.cpp.

◆ invalidated

void QSGOpenVGLayer::invalidated ( )
overrideslot

Definition at line 185 of file qsgopenvglayer.cpp.

Referenced by ~QSGOpenVGLayer().

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◆ markDirtyTexture

void QSGOpenVGLayer::markDirtyTexture ( )
overrideslot

Definition at line 177 of file qsgopenvglayer.cpp.

References emit, and QSGLayer::updateRequested().

Referenced by setItem(), setLive(), setMirrorHorizontal(), setMirrorVertical(), setRect(), and setSize().

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◆ scheduleUpdate()

void QSGOpenVGLayer::scheduleUpdate ( )
overridevirtual

Implements QSGLayer.

Definition at line 110 of file qsgopenvglayer.cpp.

References emit, and QSGLayer::updateRequested().

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◆ setDevicePixelRatio()

void QSGOpenVGLayer::setDevicePixelRatio ( qreal  ratio)
overridevirtual

Implements QSGLayer.

Definition at line 156 of file qsgopenvglayer.cpp.

◆ setFormat()

void QSGOpenVGLayer::setFormat ( uint  format)
override

Definition at line 146 of file qsgopenvglayer.cpp.

References Q_UNUSED.

◆ setHasMipmaps()

void QSGOpenVGLayer::setHasMipmaps ( bool  mipmap)
overridevirtual

Implements QSGLayer.

Definition at line 151 of file qsgopenvglayer.cpp.

References Q_UNUSED.

◆ setItem()

void QSGOpenVGLayer::setItem ( QSGNode *  item)
overridevirtual

Implements QSGLayer.

Definition at line 70 of file qsgopenvglayer.cpp.

References item, and markDirtyTexture().

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◆ setLive()

void QSGOpenVGLayer::setLive ( bool  live)
overridevirtual

Implements QSGLayer.

Definition at line 125 of file qsgopenvglayer.cpp.

References QSize::isNull(), and markDirtyTexture().

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◆ setMirrorHorizontal()

void QSGOpenVGLayer::setMirrorHorizontal ( bool  mirror)
overridevirtual

Implements QSGLayer.

Definition at line 161 of file qsgopenvglayer.cpp.

References markDirtyTexture().

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◆ setMirrorVertical()

void QSGOpenVGLayer::setMirrorVertical ( bool  mirror)
overridevirtual

Implements QSGLayer.

Definition at line 169 of file qsgopenvglayer.cpp.

References markDirtyTexture().

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◆ setRect()

void QSGOpenVGLayer::setRect ( const QRectF &  rect)
overridevirtual

Implements QSGLayer.

Definition at line 86 of file qsgopenvglayer.cpp.

References markDirtyTexture(), and rect.

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◆ setRecursive()

void QSGOpenVGLayer::setRecursive ( bool  recursive)
overridevirtual

Implements QSGLayer.

Definition at line 141 of file qsgopenvglayer.cpp.

◆ setSamples()

void QSGOpenVGLayer::setSamples ( int  )
inlineoverridevirtual

Implements QSGLayer.

Definition at line 52 of file qsgopenvglayer.h.

◆ setSize()

void QSGOpenVGLayer::setSize ( const QSize &  size)
overridevirtual

Implements QSGLayer.

Definition at line 94 of file qsgopenvglayer.cpp.

References QSize::isNull(), and markDirtyTexture().

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◆ textureSize()

QSize QSGOpenVGLayer::textureSize ( ) const
overridevirtual

Returns the size of the texture in pixels.

Implements QSGTexture.

Definition at line 40 of file qsgopenvglayer.cpp.

References QOpenVGOffscreenSurface::size().

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◆ toImage()

QImage QSGOpenVGLayer::toImage ( ) const
overridevirtual

Implements QSGLayer.

Definition at line 120 of file qsgopenvglayer.cpp.

References QOpenVGOffscreenSurface::readbackQImage().

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◆ updateTexture()

bool QSGOpenVGLayer::updateTexture ( )
overridevirtual

Call this function to explicitly update the dynamic texture.

The function returns true if the texture was changed as a resul of the update; otherwise returns false.

Note
This function is typically called from QQuickItem::updatePaintNode() or QSGNode::preprocess(), meaning during the {synchronization} or the {node preprocessing} phases of the scenegraph. Calling it at other times is discouraged and can lead to unexpected behavior.

Implements QSGDynamicTexture.

Definition at line 59 of file qsgopenvglayer.cpp.

References emit, and QSGLayer::scheduledUpdateCompleted().

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