内容

• 公共函数
• 静态公共成员
• 详细描述

QQuickTextureFactory Class

The QQuickTextureFactory class provides an interface for loading custom textures from QML. 更多...

头：	#include <QQuickTextureFactory>
qmake:	QT += quick
Since:	Qt 5.0
继承：	QObject

• 所有成员列表，包括继承成员

公共函数

	QQuickTextureFactory ()
virtual	~QQuickTextureFactory ()
virtual QSGTexture *	createTexture (QQuickWindow * window ) const = 0
virtual QImage	image () const
virtual int	textureByteCount () const = 0
virtual QSize	textureSize () const = 0

• 32 公共函数继承自 QObject

静态公共成员

QQuickTextureFactory *

textureFactoryForImage (const QImage & image )

• 11 静态公共成员继承自 QObject

额外继承成员

• 1 特性继承自 QObject
• 1 公共槽继承自 QObject
• 2 信号继承自 QObject
• 9 保护函数继承自 QObject

详细描述

The QQuickTextureFactory class provides an interface for loading custom textures from QML.

The purpose of the texture factory is to provide a placeholder for a image data that can be converted into an OpenGL texture.

Creating a texture directly is not possible as there is rarely an OpenGL context available in the thread that is responsible for loading the image data.

成员函数文档编制

QQuickTextureFactory:: QQuickTextureFactory ()

Constructs a texture factory. Since QQuickTextureFactory is abstract, it cannot be instantiated directly.

[虚拟] QQuickTextureFactory:: ~QQuickTextureFactory ()

Destroys the texture factory.

[pure virtual] QSGTexture *QQuickTextureFactory:: createTexture ( QQuickWindow * window ) const

This function is called on the scene graph rendering thread to create a QSGTexture instance from the factory. window provides the context which this texture is created in.

QML will internally cache the returned texture as needed. Each call to this function should return a unique instance.

The OpenGL context used for rendering is bound when this function is called.

[虚拟] QImage QQuickTextureFactory:: image () const

Returns an image version of this texture.

The lifespan of the returned image is unknown, so the implementation should return a self contained QImage , not make use of the QImage (uchar *, ...) constructor.

This function is not commonly used and is expected to be slow.

[pure virtual] int QQuickTextureFactory:: textureByteCount () const

Returns the number of bytes of memory the texture consumes.

[static] QQuickTextureFactory *QQuickTextureFactory:: textureFactoryForImage (const QImage & image )

返回 QQuickTextureFactory holding the given image .

This is typically used as a helper in QQuickImageResponse::textureFactory .

该函数在 Qt 5.6 引入。

[pure virtual] QSize QQuickTextureFactory:: textureSize () const

Returns the size of the texture. This function will be called from arbitrary threads and should not rely on an OpenGL context bound.