Reference Manual - 1.0.1
IDirectFBWindow   SetColorKey

Set the window color key.    设置窗口的色彩值 .

SetColorKey (
	IDirectFBWindow		*	thiz,
	u8			r,
	u8			g,
	u8			b
);

If a pixel of the window matches this color the underlying window or the background is visible at this point.

如果那window的象数与这个windows 的相同,或者那背景是可见的指针.

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