Tab Capture: Backing store readbacks to YV12 VideoFrames.

content/browser/renderer_host/render_widget_host_view_win.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_view_win.h"
 
 #include <InputScope.h>
 
 #include <algorithm>
 #include <map>
@@ skipping 801 matching lines @@
 
 void RenderWidgetHostViewWin::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
     const base::Callback<void(bool, const SkBitmap&)>& callback) {
   base::ScopedClosureRunner scoped_callback_runner(
       base::Bind(callback, false, SkBitmap()));
   if (!accelerated_surface_.get())
     return;
 
-  if (dst_size.IsEmpty())
+  if (dst_size.IsEmpty() || src_subrect.IsEmpty())
     return;
 
   scoped_callback_runner.Release();
-  accelerated_surface_->AsyncCopyTo(
-      src_subrect,
-      dst_size,
-      callback);
+  accelerated_surface_->AsyncCopyTo(src_subrect, dst_size, callback);
+}
+
+void RenderWidgetHostViewWin::CopyFromCompositingSurfaceToVideoFrame(
+    const gfx::Rect& src_subrect,
+    const scoped_refptr<media::VideoFrame>& target,
+    const base::Callback<void(bool)>& callback) {
+  base::ScopedClosureRunner scoped_callback_runner(base::Bind(callback, false));
+  if (!accelerated_surface_.get())
+    return;
+
+  if (!target || target->format() != media::VideoFrame::YV12)
+    return;
+
+  if (src_subrect.IsEmpty())
+    return;
+
+  scoped_callback_runner.Release();
+  accelerated_surface_->AsyncCopyToVideoFrame(src_subrect, target, callback);
+}
+
+bool RenderWidgetHostViewWin::CanCopyToVideoFrame() const {
+  return accelerated_surface_.get() && render_widget_host_ &&
+      render_widget_host_->is_accelerated_compositing_active();
 }
 
 void RenderWidgetHostViewWin::SetBackground(const SkBitmap& background) {
   RenderWidgetHostViewBase::SetBackground(background);
   render_widget_host_->SetBackground(background);
 }
 
 void RenderWidgetHostViewWin::ProcessAckedTouchEvent(
     const WebKit::WebTouchEvent& touch, InputEventAckState ack_result) {
   DCHECK(touch_events_enabled_);
@@ skipping 2227 matching lines @@
   return new RenderWidgetHostViewWin(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(
       WebKit::WebScreenInfo* results) {
   GetScreenInfoForWindow(results, 0);
 }
 
 }  // namespace content