Reference Manual - 1.0.1
IDirectFB   EnumDisplayLayers

Enumerate all existing display layers.枚举所存在的层

EnumDisplayLayers (
	IDirectFB		*	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().

为每一个有效的显示层调用回调函数。回调函数传递层的ID,可以被IDirectFB::GetDisplayLayer().使用取得指定层的接口

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