Drop frontbuffers with ui-use-gpu-process, synchronized with browser, decoupled from backbuffer dro…

content/browser/renderer_host/render_widget_host_view_aura.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_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "content/browser/renderer_host/image_transport_factory.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/content_export.h"
 #include "ui/aura/client/activation_delegate.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/gfx/rect.h"
 #include "webkit/glue/webcursor.h"
 
@@ skipping 18 matching lines @@
 class RenderWidgetHostImpl;
 class RenderWidgetHostView;
 
 // RenderWidgetHostView class hierarchy described in render_widget_host_view.h.
 class RenderWidgetHostViewAura
     : public RenderWidgetHostViewBase,
       public ui::CompositorObserver,
       public ui::TextInputClient,
       public aura::WindowDelegate,
       public aura::client::ActivationDelegate,
-      public ImageTransportFactoryObserver {
+      public ImageTransportFactoryObserver,
+      public base::SupportsWeakPtr<RenderWidgetHostViewAura> {
  public:
   // RenderWidgetHostView implementation.
   virtual void InitAsChild(gfx::NativeView parent_view) OVERRIDE;
   virtual RenderWidgetHost* GetRenderWidgetHost() const OVERRIDE;
   virtual void SetSize(const gfx::Size& size) OVERRIDE;
   virtual void SetBounds(const gfx::Rect& rect) OVERRIDE;
   virtual gfx::NativeView GetNativeView() const OVERRIDE;
   virtual gfx::NativeViewId GetNativeViewId() const OVERRIDE;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() OVERRIDE;
   virtual bool HasFocus() const OVERRIDE;
@@ skipping 168 matching lines @@
 
   // Insert a sync point into the compositor's command stream and acknowledge
   // that we have presented the accelerated surface buffer.
   static void InsertSyncPointAndACK(int32 route_id,
                                     int gpu_host_id,
                                     ui::Compositor* compositor);
 
   // Called when window_ is removed from the window tree.
   void RemovingFromRootWindow();
 
+  // After clearing |current_surface_|, and waiting for the compositor to finish
+  // using it, call this to inform the gpu process.
+  void SetSurfaceNotInUseByCompositor(ui::Compositor* compositor);
+
+  // This is called every time |current_surface_| usage changes (by thumbnailer,
+  // compositor draws, and tab visibility). Every time usage of current surface
+  // changes between "may be used" and "certain to not be used" by the ui, we
+  // inform the gpu process.
+  void AdjustSurfaceProtection();
+
+  // Called after async thumbnailer task completes.  Used to call
+  // AdjustSurfaceProtection.
+  void CopyFromCompositingSurfaceFinished(base::Callback<void(bool)> callback,
+                                          bool result);
+
   ui::Compositor* GetCompositor();
 
   // Detaches |this| from the input method object.
   void DetachFromInputMethod();
 
   // Converts |rect| from window coordinate to screen coordinate.
   gfx::Rect ConvertRectToScreen(const gfx::Rect& rect);
 
   // The model object.
   RenderWidgetHostImpl* host_;
@@ skipping 48 matching lines @@
       on_compositing_did_commit_callbacks_;
 
   std::vector< base::Callback<void(ui::Compositor*)> >
       on_compositing_will_start_callbacks_;
 
   std::map<uint64, scoped_refptr<ui::Texture> >
       image_transport_clients_;
 
   uint64 current_surface_;
 
+  // Protected means that the |current_surface_| may be in use by ui and cannot
+  // be safely discarded. Things to consider are thumbnailer, compositor draw,
+  // and tab visibility.
+  bool current_surface_is_protected_;
+  bool current_surface_in_use_by_compositor_;
+
+  int pending_thumbnail_tasks_;
+
+  // This id increments every time surface_is_protected changes. We tag IPC
+  // messages which rely on protection state with this id to stay in sync.
+  uint32 protection_state_id_;
+
+  int32 surface_route_id_;
+
   gfx::GLSurfaceHandle shared_surface_handle_;
 
   // If non-NULL we're in OnPaint() and this is the supplied canvas.
   gfx::Canvas* paint_canvas_;
 
   // Used to record the last position of the mouse.
   // While the mouse is locked, they store the last known position just as mouse
   // lock was entered.
   // Relative to the upper-left corner of the view.
   gfx::Point unlocked_mouse_position_;
@@ skipping 22 matching lines @@
 
   // This lock is for waiting for a front surface to become available to draw.
   scoped_refptr<aura::CompositorLock> released_front_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_