[Mesa-dev] [RFC][PATCH xserver] Multi-buffered flips on subsurfaces seg fault in Mesa

Roman Gilg subdiff at gmail.com
Mon Jan 29 16:54:25 UTC 2018

The above patch series only allows flips on a child window with the same
dimensions as its parent xwl_window. For flips on child windows (for example
the video view port of a video player in windowed mode, see here:
http://www.subdiff.de/assets/images/2017-07-28-a-new-beginning.jpg) I wanted
to use Wayland subsurfaces as in the attached patch.

The flipping itself works well on Weston and on KWin. But when shutting down
KWin in the end I get always a segmentation fault in Mesa when cleaning up EGL
via eglTerminate(EGLDisplay) through libepoxy.

I pinpointed the seg fault to be a missing destroyImage function pointer here:

But I don't see currently what component is making the problems here or if the
problem lies in my code.

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