Re: Overlapping GdkWindow

[Paul Davis <paul linuxaudiosystems com>]

On Thu, 2006-03-16 at 15:24 +0100, C�ic Lucantis wrote:
> Hi!
> 
> I would like to known how Gdk handles the exposition of overlapping
> windows or in other words: how does it 'knows' that a particular
> region of a window is obscured by another window and should not be
> redrawn? I had a look at the source code and think I understood how
> works the invalidate/expose mechanism but did not find anything
> related to this. (only the children region are removed from the invalid
> area in gdk_window_invalidate(), but nothing about 'sisters' or other
> parents)
> 
> Sorry if this is not very clear, my english is not good enough:) I
> have no real problem with Gtk, I just want to understand how it works.
> 
> Explanations or pointers to the relevant parts of the source would be
> welcome!

its not in the source, because its driven by the underlying window
system (e.g. X for *nix systems, win32 for windows, Quartz/Cocoa for the
new OS X port).

--p