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List: freedesktop-xorg
Subject: Re: How does screenshot work in an OS running Xorg
From: walter harms <wharms () bfs ! de>
Date: 2014-03-12 12:12:44
Message-ID: 53204F3C.60000 () bfs ! de
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Am 11.03.2014 21:40, schrieb Thomas Lübking:
> On Dienstag, 11. März 2014 21:06:20 CEST, Hongze Zhao wrote:
>> Hi List,
>>
>> I am curious about how screenshot in an OS running Xorg works? I guess
>> Linux does not provide such a system call or interface. Is screenshot
>> implemented by calling a special xorg interface?
>
> Coding C(++):
> XLib: http://tronche.com/gui/x/xlib/graphics/XGetImage.html
> xcb: http://www.x.org/archive/current/doc/man/man3/xcb_get_image.3.xhtml
>
> As user tool, xwd should be available everywhere (?), the DEs provide
> their own utils and there're plenty of other tools to provide this, but
> afaik no common call to trigger the desktop aware screenshot utility.
>
A look at xwd may also be helpful.
re,
wh
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