QWaylandBufferRef 类

QWaylandBufferRef 类保持对表面缓冲的引用。更多...

头：	#include <QWaylandBufferRef>
qmake:	QT += waylandcompositor
Since:	Qt 5.8

该类在 Qt 5.8 引入。

所有成员列表，包括继承成员

公共函数

	QWaylandBufferRef (const QWaylandBufferRef & ref )
	QWaylandBufferRef ()
QWaylandBufferRef &	operator= (const QWaylandBufferRef & ref )
	~QWaylandBufferRef ()
bool	hasBuffer () const
bool	hasContent () 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
bool	operator!= (const QWaylandBufferRef & ref )
bool	operator== (const QWaylandBufferRef & ref )

详细描述

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.

成员函数文档编制

QWaylandBufferRef:: QWaylandBufferRef (const QWaylandBufferRef & ref )

Creates a new reference to the buffer referenced by ref .

QWaylandBufferRef:: QWaylandBufferRef ()

构造 null 缓冲 ref 引用。

QWaylandBufferRef &QWaylandBufferRef:: operator= (const QWaylandBufferRef & ref )

赋值 ref to this buffer and adds a reference to it. The previously referenced buffer is dereferenced.

QWaylandBufferRef:: ~QWaylandBufferRef ()

解引用缓冲。

bool QWaylandBufferRef:: hasBuffer () const

返回 true，若此 QWaylandBufferRef 引用缓冲。否则返回 false。

另请参阅 isNull () 和 hasContent ().

bool QWaylandBufferRef:: hasContent () const

返回 true，若此 QWaylandBufferRef references a buffer that has content. Otherwise returns false.

另请参阅 isNull () 和 hasBuffer ().

QImage QWaylandBufferRef:: image () const

Returns an image with the contents of the buffer.

bool QWaylandBufferRef:: isDestroyed () const

返回 true，若此 QWaylandBufferRef references a buffer that has been destroyed. Otherwise returns false.

bool QWaylandBufferRef:: isNull () const

返回 true，若此 QWaylandBufferRef does not reference a buffer. Otherwise returns false.

另请参阅 hasBuffer () 和 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 () 被调用。

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 被返回。

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.

返回 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

返回用于缓冲的 Wayland 资源。

bool QWaylandBufferRef:: operator!= (const QWaylandBufferRef & ref )

返回 false，若此 QWaylandBufferRef 引用相同缓冲如 ref 。否则返回 true。

bool QWaylandBufferRef:: operator== (const QWaylandBufferRef & ref )

返回 true，若此 QWaylandBufferRef 引用相同缓冲如 ref 。否则返回 false。