tree d58df52ae7c955124f617aa1b6890cdb2aff83e9
parent 6f79d840ba238b8122d7ab354f54a444bb22a4ca
author zijiehe <zijiehe@chromium.org> 1474503550 -0700
committer Commit bot <commit-bot@chromium.org> 1474503555 +0000

Several minor improvements of DirectX capturer
1. It looks like ComPtr cannot work well with vector::emplace_back, I got a
consistent crash on one of my machine, but not the other. Move constructor
should have no impact to lvalue reference, but I may be wrong here. The
impact here is ComPtr released before it should be. So a simple solution is to
use copy instead of reference. The D3dDevice is a collection of reference
counted pointers (Microsoft::WRL::ComPtr), there is almost no extra cost.

2. Actively set several fields in D3D11_TEXTURE2D_DESC to avoid potential break
if there are some platform changes later.

3. AcquireNextFrame returns both a DXGI_OUTDUPL_FRAME_INFO with
AccumulatedFrames and an IDXGIResource. But there is no comment in MSDN to
ensure IDXGIResource won't be nullptr if AccumulatedFrames > 0. Adding an extra
check in DxgiOutputDuplicator makes it a safer.

BUG=314516

Review-Url: https://codereview.webrtc.org/2345163002
Cr-Commit-Position: refs/heads/master@{#14341}