Draw the offscreen texture to reflector's surface without extra copy

content/browser/compositor/browser_compositor_output_surface.h

 // Copyright 2014 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_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include "base/threading/non_thread_safe.h"
 #include "cc/output/output_surface.h"
 #include "content/common/content_export.h"
 #include "ui/compositor/compositor_vsync_manager.h"
 
 namespace cc {
 class SoftwareOutputDevice;
 }
 
 namespace content {
 class BrowserCompositorOverlayCandidateValidator;
 class ContextProviderCommandBuffer;
 class ReflectorImpl;
 class WebGraphicsContext3DCommandBufferImpl;
+class OwnedMailbox;
 
 class CONTENT_EXPORT BrowserCompositorOutputSurface
     : public cc::OutputSurface,
       public ui::CompositorVSyncManager::Observer {
  public:
   ~BrowserCompositorOutputSurface() override;
 
   // cc::OutputSurface implementation.
   bool BindToClient(cc::OutputSurfaceClient* client) override;
   cc::OverlayCandidateValidator* GetOverlayCandidateValidator() const override;
 
   // ui::CompositorOutputSurface::Observer implementation.
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval) override;
 
   void OnUpdateVSyncParametersFromGpu(base::TimeTicks tiembase,
                                       base::TimeDelta interval);
 
   void SetReflector(ReflectorImpl* reflector);
 
+  // Returns a mailbox that holds the texture used for offscreen
+  // output surface. nullptr if the output surface isn't offscreen
+  // surface.
+  virtual scoped_refptr<OwnedMailbox> GetTextureMailbox();
+
+  // Returns a callback that will be called when all mirroring
+  // compositors have started composition.
+  virtual base::Closure CreateCompositionStartedCallback();
+
 #if defined(OS_MACOSX)
   virtual void OnSurfaceDisplayed() = 0;
   virtual void SetSurfaceSuspendedForRecycle(bool suspended) = 0;
   virtual bool SurfaceShouldNotShowFramesAfterSuspendForRecycle() const = 0;
 #endif
 
  protected:
   // Constructor used by the accelerated implementation.
   BrowserCompositorOutputSurface(
       const scoped_refptr<cc::ContextProvider>& context,
@@ skipping 14 matching lines @@
 
   scoped_ptr<BrowserCompositorOverlayCandidateValidator>
       overlay_candidate_validator_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_