[Mesa-dev] [PATCH] st/dri: Add an option to always request a front buffer from the loader

[Keith Packard]

Thomas Hellstrom <thellstrom at vmware.com> writes:

> When an application decides to read from the front buffer of a window,
> typically a fake front is created and initialized with the real front window
> contents. However, if there was a window manager reparenting operation between
> the last swapbuffer and the read the real front window contents would be
> invalid. This hurts piglit applications that read from the front.

What do you mean by 'invalid'? On a running desktop, reparenting is
typically done before the window gets mapped, so there shouldn't be
*anything* done to the window by this operation. If you restart the
window manager, it will have to reparent all existing windows, which
looks like an unmap followed by a map, but those operations all do well
defined things to the window contents.

-- 
-keith
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