Reference Manual - 1.0.1
IDirectFB   GetDisplayLayer

Retrieve an interface to a specific display layer.取得一个具体的显示层

GetDisplayLayer (
	IDirectFB		*	thiz,
	DFBDisplayLayerID			layer_id,
	IDirectFBDisplayLayer		**	ret_interface
);

The default layer_id is DLID_PRIMARY. Others can be obtained using IDirectFB::EnumDisplayLayers().

默认layer_id 参数是DLID_PRIMARY，其他可以通过IDirectFB::EnumDisplayLayers()获得。

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