Reference Manual - 1.0.1
IDirectFBScreen   EnumDisplayLayers

Enumerate all existing display layers for this screen.    列出层里边所有要显示的屏幕

EnumDisplayLayers (
	IDirectFBScreen		*	thiz,
	DFBDisplayLayerCallback			callback,
	void		*	callbackdata
);

Calls the given callback for each available display layer. The callback is passed the layer id that can be used to retrieve an interface to a specific layer using IDirectFB::GetDisplayLayer().

收回有效可以显示的层,这个callback通过层ID去恢复使用接口专用的层用:IDirectFB::GetDisplayLayer().

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