Do additional blit and Present on first draw to overlay.

gpu/ipc/service/direct_composition_surface_win.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/ipc/service/direct_composition_surface_win.h"
 
 #include <d3d11_1.h>
 #include <dcomptypes.h>
 
 #include "base/feature_list.h"
@@ skipping 395 matching lines @@
         video_processor_.get(), 0, FALSE);
 
     hr = video_context_->VideoProcessorBlt(video_processor_.get(),
                                            out_view_.get(), 0, 1, &stream);
     CHECK(SUCCEEDED(hr));
   }
 
   swap_chain_scale_x_ = bounds_rect.width() * 1.0f / swap_chain_size.width();
   swap_chain_scale_y_ = bounds_rect.height() * 1.0f / swap_chain_size.height();
 
-  swap_chain_->Present(first_present ? 0 : 1, 0);
+  if (first_present) {
+    swap_chain_->Present(0, 0);
+
+    // DirectComposition can display black for a swapchain between the first
+    // and second time it's presented to - maybe the first Present can get
+    // lost somehow and it shows the wrong buffer.In that case copy the

[sunnyps, 2017/04/13 21:03:13]

nit: space after period

+    // buffers so both have the correct contents, which seems to help. The
+    // first Present() after this needs to have SyncInterval > 0, or else the
+    // workaround doesn't help.
+    base::win::ScopedComPtr<ID3D11Texture2D> dest_texture;
+    swap_chain_->GetBuffer(0, IID_PPV_ARGS(dest_texture.Receive()));

[sunnyps, 2017/04/13 21:03:12]

nit: CHECK if these calls succeeded?

+    base::win::ScopedComPtr<ID3D11Texture2D> src_texture;
+    swap_chain_->GetBuffer(1, IID_PPV_ARGS(src_texture.Receive()));
+    base::win::ScopedComPtr<ID3D11DeviceContext> context;
+    d3d11_device_->GetImmediateContext(context.Receive());
+    context->CopyResource(dest_texture.get(), src_texture.get());
+  }
+
+  swap_chain_->Present(1, 0);
 
   base::win::ScopedComPtr<IDXGISwapChainMedia> swap_chain_media;
   if (SUCCEEDED(swap_chain_.QueryInterface(swap_chain_media.Receive()))) {
     DXGI_FRAME_STATISTICS_MEDIA stats = {};
     if (SUCCEEDED(swap_chain_media->GetFrameStatisticsMedia(&stats))) {
       UMA_HISTOGRAM_SPARSE_SLOWLY("GPU.DirectComposition.CompositionMode",
                                   stats.CompositionMode);
     }
   }
 }
@@ skipping 634 matching lines @@
 DirectCompositionSurfaceWin::GetWindowTaskRunnerForTesting() {
   return child_window_.GetTaskRunnerForTesting();
 }
 
 base::win::ScopedComPtr<IDXGISwapChain1>
 DirectCompositionSurfaceWin::GetLayerSwapChainForTesting(size_t index) const {
   return layer_tree_->GetLayerSwapChainForTesting(index);
 }
 
 }  // namespace gpu