回复： transparent background of XLib window

[LIDE]

Hi:
    I don't know  if you understand my requirement.I want a subregion of the window transparent.That is to say, I use XClearArea to make an area show the background of the window.I want to set the background of the window transparent.So, I can get a subregion that is transparent.I want to use this region to show the content under the window.Xshape is not suit for me.because the events of that region I still want to use.






------------------ 原始邮件 ------------------
发件人: "Thomas Lübkin";<thomas.luebking at gmail.com>;
发送时间: 2014年4月13日(星期天) 晚上7:42
收件人: "LIDE"<1053481745 at qq.com>; 
抄送: "xorg"<xorg at freedesktop.org>; 
主题: Re: transparent background of  XLib window



On Freitag, 11. April 2014 12:16:48 CEST, LIDE wrote:
> Dear:
>      I want to create a window that has a transparent  
> window.But I really don't know how to achieve.I just set the 
> window depth  32,what should I do next?
>      Sorry to my poor English.Waiting for your  replay.THANKS!


In case you want a *transparent* (invisible) window, pass InputOnly as "class" parameter to XCreateWindow
http://tronche.com/gui/x/xlib/window/XCreateWindow.html

If you want a *translucent* (partially transparent/translucent content) window you require a running compositor (to see the translucency)
You'll also have to provide correct visual and colormap, see eg. here:
http://stackoverflow.com/questions/3645632/how-to-create-a-window-with-a-bit-depth-of-32

Cheers,
Thomas
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