Get raw data of Xrender Picture structure

[Peter Harris]

Gregoire Gentil wrote:
> - So, at this point, I consider more patching/hacking the
> window/compositing manager xfwm4 to add a screenshot when the window is
> about to be umapped. Patching something like "no more unmap" seems
> overkill for what I want to achieve.

Using the Composite extension is the right way to redirect window contents.

> Let me know if you have any other comment or idea,

Instead of re-inventing the wheel, you may wish to learn from Kompose.
http://kompose.berlios.de/

Peter Harris
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