On Sun, Jul 31, 2016 at 07:51:08AM +0000, Fabien Lelaquais wrote:
Thanks a lot for your answer.
Unfortunately I may not be able to rely of the Composite extension (app would
be deployed in environments I don't control).
Regarding the XGetImage documentation, that I've read ten times:
My drawable (mainWindow) is indeed a viewable window.
It has no inferior, and an overlapping window on its center. The specified
rectangle that I provide, which is the center part of the source window, is
both fully visible on the screen and wholly contained in mainWindow.
I have no X error.
Ahh, sorry - my bad. I had interpreted it vv.
Your demo code works fine here - my guess would be
options: backing-store NO, save-unders NO
^^^^^^^^^^^^^^^^^^^^^
this one to be the troublemaker - enable the backing store (set "WHEN
MAPPED" here) and try again.
Option "BackingStore" "on"
in the screen section - or pass +bs to Xorg
Unfortunately I don't know whether the BackingStore is a hard condition
or things are supposed to work anyway (ie. this would be a bug in the
server)
Cheers and sorry for the fuzz,
Thomas
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