QWaylandBufferRef Class
The QWaylandBufferRef class holds the reference to a surface buffer. More...
| Header: | #include <QWaylandBufferRef> |
| CMake: | find_package(Qt6 REQUIRED COMPONENTS WaylandCompositor) target_link_libraries(mytarget PRIVATE Qt6::WaylandCompositor) |
| qmake: | QT += waylandcompositor |
Public Functions
| QWaylandBufferRef() | |
| QWaylandBufferRef(const QWaylandBufferRef &ref) | |
| ~QWaylandBufferRef() | |
| bool | hasBuffer() const |
| bool | hasContent() const |
| bool | hasProtectedContent() const |
| QImage | image() const |
| bool | isDestroyed() const |
| bool | isNull() const |
| bool | isSharedMemory() const |
| quintptr | lockNativeBuffer() |
| QWaylandSurface::Origin | origin() const |
| QSize | size() const |
| QOpenGLTexture * | toOpenGLTexture(int plane = 0) const |
| void | unlockNativeBuffer(quintptr handle) |
| struct wl_resource * | wl_buffer() const |
| QWaylandBufferRef & | operator=(const QWaylandBufferRef &ref) |
Related Non-Members
| bool | operator!=(const QWaylandBufferRef &lhs, const QWaylandBufferRef &rhs) |
| bool | operator==(const QWaylandBufferRef &lhs, const QWaylandBufferRef &rhs) |
Detailed Description
This class can be used to reference a surface buffer. As long as a reference to the buffer exists, it is owned by the compositor and the client cannot modify it.
Member Function Documentation
QWaylandBufferRef::QWaylandBufferRef()
Constructs a null buffer ref.
QWaylandBufferRef::QWaylandBufferRef(const QWaylandBufferRef &ref)
Creates a new reference to the buffer referenced by ref.
QWaylandBufferRef::~QWaylandBufferRef()
Dereferences the buffer.
bool QWaylandBufferRef::hasBuffer() const
Returns true if this QWaylandBufferRef references a buffer. Otherwise returns false.
See also isNull() and hasContent().
bool QWaylandBufferRef::hasContent() const
Returns true if this QWaylandBufferRef references a buffer that has content. Otherwise returns false.
See also isNull() and hasBuffer().
[since 6.2] bool QWaylandBufferRef::hasProtectedContent() const
Returns true if this QWaylandBufferRef references a buffer that has protected content. Otherwise returns false.
Note: This is an enabler which presumes support in the client buffer integration. None of the client buffer integrations included with Qt currently support protected content buffers.
This function was introduced in Qt 6.2.
See also hasContent().
QImage QWaylandBufferRef::image() const
Returns an image with the contents of the buffer.
bool QWaylandBufferRef::isDestroyed() const
Returns true if this QWaylandBufferRef references a buffer that has been destroyed. Otherwise returns false.
bool QWaylandBufferRef::isNull() const
Returns true if this QWaylandBufferRef does not reference a buffer. Otherwise returns false.
See also hasBuffer() and hasContent().
bool QWaylandBufferRef::isSharedMemory() const
Returns true if the buffer is a shared memory buffer. Otherwise returns false.
quintptr QWaylandBufferRef::lockNativeBuffer()
Returns the native handle for this buffer, and marks it as locked so it will not be released until unlockNativeBuffer() is called.
Returns 0 if there is no native handle for this buffer, or if the lock was unsuccessful.
QWaylandSurface::Origin QWaylandBufferRef::origin() const
Returns the origin of the buffer. If the buffer referenced is null, QWaylandSurface::OriginBottomLeft is returned.
QSize QWaylandBufferRef::size() const
Returns the size of the buffer. If the buffer referenced is null, an invalid QSize() is returned.
QOpenGLTexture *QWaylandBufferRef::toOpenGLTexture(int plane = 0) const
Returns an OpenGL texture for the buffer. plane is the index for multi-plane formats, such as YUV.
The returned texture is owned by the buffer. The texture is only valid for as long as the buffer reference exists. The caller of this function must not delete the texture, and must keep a reference to the buffer for as long as the texture is being used.
Returns nullptr if there is no valid buffer, or if no texture can be created.
void QWaylandBufferRef::unlockNativeBuffer(quintptr handle)
Marks the native buffer as no longer in use. handle must correspond to the value returned by a previous call to lockNativeBuffer().
struct wl_resource *QWaylandBufferRef::wl_buffer() const
Returns the Wayland resource for the buffer.
QWaylandBufferRef &QWaylandBufferRef::operator=(const QWaylandBufferRef &ref)
Assigns ref to this buffer and adds a reference to it. The previously referenced buffer is dereferenced.
Related Non-Members
bool operator!=(const QWaylandBufferRef &lhs, const QWaylandBufferRef &rhs)
Returns false if lhs references the same buffer as rhs. Otherwise returns true.
bool operator==(const QWaylandBufferRef &lhs, const QWaylandBufferRef &rhs)
Returns true if lhs references the same buffer as rhs. Otherwise returns false.
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