回复： transparent background of XLib window

[LIDE]

What do you mean "a running compositor"? Can you give me some example? If I want to set the background of thewindow transparent,how should I do?



------------------ 原始邮件 ------------------
发件人: "Thomas Lübkin"; 
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 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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