- Qt 6.4
- Qt Wayland Compositor
- C++ Classes
- QWaylandSurfaceGrabber
- Qt Wayland Compositor | Commercial or GPLv3

# QWaylandSurfaceGrabber Class

The QWaylandSurfaceGrabber class allows to read the content of a QWaylandSurface. More...

Header: | #include <QWaylandSurfaceGrabber>
CMake: | find_package(Qt6 REQUIRED COMPONENTS Waylandcompositor) target_link_libraries(mytarget PRIVATE Qt6::Waylandcompositor)
qmake: | QT += waylandcompositor
Since: | Qt 5.8

- List of all members, including inherited members

## Public Types

enum | Error { InvalidSurface, NoBufferAttached, UnknownBufferType, RendererNotReady }

## Public Functions

| QWaylandSurfaceGrabber(QWaylandSurface *surface, QObject *parent = nullptr)
void | grab()
QWaylandSurface * | surface() const

## Detailed Description

Sometimes it is needed to get the contents of a surface, for example to provide a screenshot to the user. The QWaylandSurfaceGrabber class provides a simple method to do so, without having to care what type of buffer backs the surface, be it shared memory, OpenGL or something else.

## Member Type Documentation

### enum QWaylandSurfaceGrabber::Error

The Error enum describes the reason for a grab failure.

Constant | Value | Description
--- | --- | ---
`QWaylandSurfaceGrabber::InvalidSurface` | `0` | The surface is null or otherwise not valid.
`QWaylandSurfaceGrabber::NoBufferAttached` | `1` | The client has not attached a buffer on the surface yet.
`QWaylandSurfaceGrabber::UnknownBufferType` | `2` | The buffer attached on the surface is of an unknown type.
`QWaylandSurfaceGrabber::RendererNotReady` | `3` | The compositor renderer is not ready to grab the surface content.

## Member Function Documentation

### QWaylandSurfaceGrabber::QWaylandSurfaceGrabber(QWaylandSurface *surface, QObject *parent = nullptr)

Create a QWaylandSurfaceGrabber object with the given surface and parent

### void QWaylandSurfaceGrabber::grab()

Grab the content of the surface set on this object. It may not be possible to do that immediately so the success and failed signals should be used to be notified of when the grab is completed.

### QWaylandSurface *QWaylandSurfaceGrabber::surface() const

Returns the surface set on this object