IDirectFBWindow - SetOpaqueRegion [DirectFB Reference Manual]

SetOpaqueRegion

Disable alpha channel blending for one region of the window. 禁用alpha通道,用于合成其它部分的窗口.

SetOpaqueRegion (

IDirectFBWindow * thiz,

int x1,

int y1,

int x2,

int y2

);

If DWOP_ALPHACHANNEL and DWOP_OPAQUE_REGION are set but not DWOP_COLORKEYING and the opacity of the window is 255 the window gets rendered without alpha blending within the specified region.

如果DWOP_ALPHACHNNEL 和DWOP_OPAQUE_REGION 被设置了,但是没有设置DWOP_COLORKEYING 和设置window透明色为255的,这是最初定的精确位置.

This is extremely useful for alpha blended window decorations while the main content stays opaque and gets rendered faster.

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SetOpaqueRegion (
	IDirectFBWindow	*	thiz,
	int		x1,
	int		y1,
	int		x2,
	int		y2
);