- Qt 5.15
- Qt 3D
- C++ Classes
- QBlitFramebuffer
- Qt 5.15.11 Reference Documentation

# QBlitFramebuffer Class

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

virtual | ~QBlitFramebuffer()
QRenderTarget * | destination() const
Qt3DRender::QRenderTargetOutput::AttachmentPoint | destinationAttachmentPoint() const
QRectF | destinationRect() const
InterpolationMethod | interpolationMethod() const
void | setDestination(QRenderTarget *destination)
void | setDestinationAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint)
void | setDestinationRect(const QRectF &outputRect)
void | setInterpolationMethod(InterpolationMethod interpolationMethod)
void | setSource(QRenderTarget *source)
void | setSourceAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint)
void | setSourceRect(const QRectF &inputRect)
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.

## Property Documentation

### destination : Qt3DRender::QRenderTarget*

Specifies the destination render target. When not set, the destination is assumed to 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.

Access functions:

QRenderTarget * | destination() const
void | setDestination(QRenderTarget *destination)

Notifier signal:

void | destinationChanged()

### destinationAttachmentPoint : Qt3DRender::QRenderTargetOutput::AttachmentPoint

Specifies the target attachment point.

Access functions:

Qt3DRender::QRenderTargetOutput::AttachmentPoint | destinationAttachmentPoint() const
void | setDestinationAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint)

Notifier signal:

void | destinationAttachmentPointChanged()

### destinationRect : QRectF

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

Access functions:

QRectF | destinationRect() const
void | setDestinationRect(const QRectF &outputRect)

Notifier signal:

void | destinationRectChanged()

### source : Qt3DRender::QRenderTarget*

Specifies the source render target. When not set, the source is assumed to 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.

Access functions:

QRenderTarget * | source() const
void | setSource(QRenderTarget *source)

Notifier signal:

void | sourceChanged()

### sourceAttachmentPoint : Qt3DRender::QRenderTargetOutput::AttachmentPoint

Specifies the source attachment point.

Access functions:

Qt3DRender::QRenderTargetOutput::AttachmentPoint | sourceAttachmentPoint() const
void | setSourceAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint)

Notifier signal:

void | sourceAttachmentPointChanged()

### sourceRect : QRectF

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

Access functions:

QRectF | sourceRect() const
void | setSourceRect(const QRectF &inputRect)

Notifier signal:

void | sourceRectChanged()

## Member Function Documentation

### `[virtual]` QBlitFramebuffer::~QBlitFramebuffer()

Destructor.

### 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().

### InterpolationMethod QBlitFramebuffer::interpolationMethod() const

Returns the interpolation method.

Note: Getter function for property interpolationMethod.

See also setInterpolationMethod().

### void QBlitFramebuffer::setDestination(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(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(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().

### 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().