Re: How to get image of offscreen widget or window ?
- From: James Henstridge <james jamesh id au>
- To: Grim S <grims_6 yahoo com>
- Cc: gtk-devel-list gnome org
- Subject: Re: How to get image of offscreen widget or window ?
- Date: Thu, 17 Jun 2004 13:49:14 +0800
On 16/06/2004 11:01 PM, Grim S wrote:
I have a GTK window which is slightly offscreen - when
i used gdk_drawable_get_image() the offscreen portions
are black in color - is there an api/hack/anything
which will allow me to get to the drawing of
widget/window, or make the widget/window paint to a
different context?
Is there a defect for this problem ?
Any help would be greatly appreciated.
First of all, gtk-devel-list is a list for discussing the development of
GTK. For questions like this about developing with GTK, you should use
gtk-list or gtk-app-devel-list.
In X11, windows (unlike pixmaps) have no backing store. If they aren't
on screen, or are obscured, then there is no contents to grab.
However, if you are using an X server that supports the composite
extension (currently only the freedesktop.org X server), then it is
possible to redirect a window hierarchy to render to a pixmap. This
would allow you to grab the contents of the window, even if it isn't
visible on the screen. It will take a while before you can rely on this
sort of functionality though.
James.
--
Email: james daa com au
WWW: http://www.daa.com.au/~james/
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