Tab Capture: Backing store readbacks to YV12 VideoFrames.

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 583 matching lines @@
       "RenderWidgetHostImpl::CopyFromBackingStore::FromBackingStore");
   gfx::Rect copy_rect = src_subrect.IsEmpty() ?
       gfx::Rect(backing_store->size()) : src_subrect;
   // When the result size is equal to the backing store size, copy from the
   // backing store directly to the output canvas.
   skia::PlatformBitmap output;
   bool result = backing_store->CopyFromBackingStore(copy_rect, &output);
   callback.Run(result, output.GetBitmap());
 }
 
+bool RenderWidgetHostImpl::CanCopyToVideoFrame() const {
+#if !defined(OS_WIN)
+  return false;
+#else
+  return view_ && is_accelerated_compositing_active_;
+#endif
+}
+
+void RenderWidgetHostImpl::CopyFromBackingStoreToVideoFrame(
+    const gfx::Rect& src_subrect,
+    const gfx::Size& dst_size,
+    const base::Callback<void(media::VideoFrame*)>& callback) {
+#if defined(OS_WIN)
+  if (view_ && is_accelerated_compositing_active_) {
+    TRACE_EVENT0("browser",
+        "RenderWidgetHostImpl::CopyFromBackingStoreToVideoFrame");
+    gfx::Rect copy_rect = src_subrect.IsEmpty() ?
+        gfx::Rect(view_->GetViewBounds().size()) : src_subrect;
+    view_->CopyFromCompositingSurfaceToVideoFrame(copy_rect,
+                                                  dst_size,
+                                                  callback);
+    return;
+  }
+
+  NOTREACHED() << "CopyFromBackingStoreToVideoFrame() called when not possible";
+#endif
+  callback.Run(media::VideoFrame::CreateEmptyFrame());
+}
+
 #if defined(TOOLKIT_GTK)
 bool RenderWidgetHostImpl::CopyFromBackingStoreToGtkWindow(
     const gfx::Rect& dest_rect, GdkWindow* target) {
   BackingStore* backing_store = GetBackingStore(false);
   if (!backing_store)
     return false;
   (static_cast<BackingStoreGtk*>(backing_store))->PaintToRect(
       dest_rect, target);
   return true;
 }
@@ skipping 1772 matching lines @@
     return;
 
   OnRenderAutoResized(new_size);
 }
 
 void RenderWidgetHostImpl::DetachDelegate() {
   delegate_ = NULL;
 }
 
 }  // namespace content