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Vladimir Belyavsky 2581bed66b QRhiD3D11: do not crash on endFrame() when IDXGISwapChain is null
There are reports on crashes in QRhiD3D11::endFrame() due to nullptr
access to swapChain (IDXGISwapChain). It's still not clear under what
conditions this might happen, but we can make a speculative fix (as a
last chance) by simply adding a check that the swapChain is not null.

Instead of crashing in such cases, we will warn now and return
QRhi::FrameOpError, similar to the case when IDXGISwapChain::Present()
failed.

Task-number: QTBUG-109708
Pick-to: 6.6 6.5
Change-Id: I2b0430347a229a618176a38ce3dc9c6e5a33a60c
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
2023-10-04 09:44:42 +00:00
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