Allow CopyFromBackingStore to fallback to copying from the renderer side if the accelerated surface…

content/browser/renderer_host/render_widget_host_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
 #include <queue>
 #include <string>
+#include <utility>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process_util.h"
 #include "base/string16.h"
 #include "base/time.h"
 #include "base/timer.h"
@@ skipping 420 matching lines @@
 
   int SyntheticScrollMessageInterval() const;
 
   // Sets whether the overscroll controller should be enabled for this page.
   void SetOverscrollControllerEnabled(bool enabled);
 
   // Suppreses future char events until a keydown. See
   // suppress_next_char_events_.
   void SuppressNextCharEvents();
 
+  // Grab snapshot from renderer side. This is used when CopyFromBackingStore
+  // fails due to the backing store not being available or, in composited mode,
+  // when the accelerated surface is not available to the browser side.
+  void GetSnapshotFromRenderer(
+      const gfx::Rect& src_subrect,
+      const gfx::Size& dst_size,
+      const base::Callback<void(bool, const SkBitmap&)>& callback);
+
  protected:
   virtual RenderWidgetHostImpl* AsRenderWidgetHostImpl() OVERRIDE;
 
   // Transmits the given input event. This is an internal helper for
   // |ForwardInputEvent()| and should not be used directly from elsewhere.
   void SendInputEvent(const WebKit::WebInputEvent& input_event,
                       int event_size, bool is_keyboard_shortcut);
 
   // Internal implementation of the public Forward*Event() methods.
   void ForwardInputEvent(const WebKit::WebInputEvent& input_event,
@@ skipping 132 matching lines @@
   void OnUnlockMouse();
   void OnShowDisambiguationPopup(const gfx::Rect& rect,
                                  const gfx::Size& size,
                                  const TransportDIB::Id& id);
 #if defined(OS_WIN)
   void OnWindowlessPluginDummyWindowCreated(
       gfx::NativeViewId dummy_activation_window);
   void OnWindowlessPluginDummyWindowDestroyed(
       gfx::NativeViewId dummy_activation_window);
 #endif
+  void OnSnapshot(bool success, const SkBitmap& bitmap);
 
   // Called (either immediately or asynchronously) after we're done with our
   // BackingStore and can send an ACK to the renderer so it can paint onto it
   // again.
   void DidUpdateBackingStore(const ViewHostMsg_UpdateRect_Params& params,
                              const base::TimeTicks& paint_start);
 
   // Paints the given bitmap to the current backing store at the given
   // location.  Returns true if the passed callback was asynchronously
   // scheduled in the future (and thus the caller must manually synchronously
@@ skipping 235 matching lines @@
   typedef std::map<int, scoped_refptr<SmoothScrollGesture> >
       SmoothScrollGestureMap;
   SmoothScrollGestureMap active_smooth_scroll_gestures_;
   base::TimeTicks last_smooth_scroll_gestures_tick_time_;
   bool tick_active_smooth_scroll_gestures_task_posted_;
 
   scoped_ptr<TouchEventQueue> touch_event_queue_;
   scoped_ptr<GestureEventFilter> gesture_event_filter_;
   scoped_ptr<OverscrollController> overscroll_controller_;
 
+  typedef std::pair<gfx::Size, base::Callback<void(bool, const SkBitmap&)> >
+      PendingSnapshotInfo;
+  std::queue<PendingSnapshotInfo> pending_snapshots_;
+
 #if defined(OS_WIN)
   std::list<HWND> dummy_windows_for_activation_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_