QBlitFramebuffer Class

(Qt3DRender::QBlitFramebuffer)

FrameGraph node to transfer a rectangle of pixel values from one region of a render target to another. More...

Header:	#include <QBlitFramebuffer>
qmake:	QT += 3drender
Since:	Qt 5.10
Instantiated By:	BlitFramebuffer
Inherits:	Qt3DRender::QFrameGraphNode

This class was introduced in Qt 5.10.

• List of all members, including inherited members

Public Types

enum	InterpolationMethod { Nearest, Linear }

Properties

destination : Qt3DRender::QRenderTarget* destinationAttachmentPoint : Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationRect : QRectF

source : Qt3DRender::QRenderTarget* sourceAttachmentPoint : Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceRect : QRectF

Public Functions

	QBlitFramebuffer(Qt3DCore::QNode *parent = nullptr)
virtual	~QBlitFramebuffer()
Qt3DRender::QRenderTarget *	destination() const
Qt3DRender::QRenderTargetOutput::AttachmentPoint	destinationAttachmentPoint() const
QRectF	destinationRect() const
Qt3DRender::QBlitFramebuffer::InterpolationMethod	interpolationMethod() const
void	setDestination(Qt3DRender::QRenderTarget *destination)
void	setDestinationAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint)
void	setDestinationRect(const QRectF &outputRect)
void	setInterpolationMethod(Qt3DRender::QBlitFramebuffer::InterpolationMethod interpolationMethod)
void	setSource(Qt3DRender::QRenderTarget *source)
void	setSourceAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint)
void	setSourceRect(const QRectF &inputRect)
Qt3DRender::QRenderTarget *	source() const
Qt3DRender::QRenderTargetOutput::AttachmentPoint	sourceAttachmentPoint() const
QRectF	sourceRect() const

Signals

void	destinationAttachmentPointChanged()
void	destinationChanged()
void	destinationRectChanged()
void	interpolationMethodChanged()
void	sourceAttachmentPointChanged()
void	sourceChanged()
void	sourceRectChanged()

Detailed Description

This node inserts a glBlitFrameBuffer or an equivalent into the command stream. This provides a more efficient method for copying rectangles between textures or surface backbuffers wrapped by QRenderTarget than drawing textured quads. It also supports scaling with the specified interpolation method.

Note: In practice the QBlitFramebuffer node will often be used in combination with QNoDraw since a blit should not involve issuing draw calls for any entities.

Member Type Documentation

enum QBlitFramebuffer::InterpolationMethod

Specifies the interpolation applied if the image is stretched.

Constant	Value	Description
Qt3DRender::QBlitFramebuffer::Nearest	0	Nearest-neighbor interpolation.
Qt3DRender::QBlitFramebuffer::Linear	1	Linear interpolation.

Member Function Documentation

QBlitFramebuffer::QBlitFramebuffer(Qt3DCore::QNode *parent = nullptr)

Constructs a new QBlitFramebuffer with the given parent.

[virtual] QBlitFramebuffer::~QBlitFramebuffer()

Destructor.

Qt3DRender::QRenderTarget *QBlitFramebuffer::destination() const

Returns the destination render target.

Note: Getter function for property destination.

See also setDestination().

Qt3DRender::QRenderTargetOutput::AttachmentPoint QBlitFramebuffer::destinationAttachmentPoint() const

Returns the destination attachment point.

Note: Getter function for property destinationAttachmentPoint.

See also setDestinationAttachmentPoint().

QRectF QBlitFramebuffer::destinationRect() const

Returns the destination rectangle.

Note: Getter function for property destinationRect.

See also setDestinationRect().

Qt3DRender::QBlitFramebuffer::InterpolationMethod QBlitFramebuffer::interpolationMethod() const

Returns the interpolation method.

Note: Getter function for property interpolationMethod.

See also setInterpolationMethod().

void QBlitFramebuffer::setDestination(Qt3DRender::QRenderTarget *destination)

Sets the destination render target. The default value is nullptr, in which case the destination is assumed to be be the default framebuffer (i.e. the backbuffer of the current surface), if there is one.

Note: the source and destination must not refer to the same render target.

Note: As with other nodes, destination gets automatically parented to the QBlitFramebuffer instance when no parent has been set. The lifetime is also tracked, meaning the destination reverts to nullptr in case the currently set destination is destroyed.

Note: Setter function for property destination.

See also destination().

void QBlitFramebuffer::setDestinationAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint)

Sets the destinationAttachmentPoint. Defaults to Qt3DRender::QRenderTargetOutput::AttachmentPoint::Color0.

Note: Setter function for property destinationAttachmentPoint.

See also destinationAttachmentPoint().

void QBlitFramebuffer::setDestinationRect(const QRectF &outputRect)

Sets the destination rectangle to outputRect. The coordinates are assumed to follow the normal Qt coordinate system, meaning Y runs from top to bottom.

Note: Setter function for property destinationRect.

See also destinationRect().

void QBlitFramebuffer::setInterpolationMethod(Qt3DRender::QBlitFramebuffer::InterpolationMethod interpolationMethod)

Sets the interpolationMethod that is applied if the image is stretched. Defaults to Linear.

Note: Setter function for property interpolationMethod.

See also interpolationMethod().

void QBlitFramebuffer::setSource(Qt3DRender::QRenderTarget *source)

Sets the source render target. The default value is nullptr, in which case the source is assumed to be be the default framebuffer (i.e. the backbuffer of the current surface), if there is one.

Note: the source and destination must not refer to the same render target.

Note: As with other nodes, source gets automatically parented to the QBlitFramebuffer instance when no parent has been set. The lifetime is also tracked, meaning the source reverts to nullptr in case the currently set source is destroyed.

Note: Setter function for property source.

See also source().

void QBlitFramebuffer::setSourceAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint)

Sets the sourceAttachmentPoint. Defaults to Qt3DRender::QRenderTargetOutput::AttachmentPoint::Color0.

Note: Setter function for property sourceAttachmentPoint.

See also sourceAttachmentPoint().

void QBlitFramebuffer::setSourceRect(const QRectF &inputRect)

Sets the source rectangle to inputRect. The coordinates are assumed to follow the normal Qt coordinate system, meaning Y runs from top to bottom.

Note: Setter function for property sourceRect.

See also sourceRect().

Qt3DRender::QRenderTarget *QBlitFramebuffer::source() const

Returns the source render target.

Note: Getter function for property source.

See also setSource().

Qt3DRender::QRenderTargetOutput::AttachmentPoint QBlitFramebuffer::sourceAttachmentPoint() const

Returns the source attachment point.

Note: Getter function for property sourceAttachmentPoint.

See also setSourceAttachmentPoint().

QRectF QBlitFramebuffer::sourceRect() const

Returns the source rectangle.

Note: Getter function for property sourceRect.

See also setSourceRect().