Reference Manual - 1.0.1
IDirectFBWindow   SetOpacity

Set the window's global opacity factor.    设置窗口的不完全透明参数.

SetOpacity (
	IDirectFBWindow		*	thiz,
	u8			opacity
);

Set it to "0" to hide a window. Setting it to "0xFF" makes the window opaque if it has no alpha channel.

设置0用以隐藏window,如果最初没有选择,那么就会设置0XFF使window不透明

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