Share backing canvases between browser compositors.

content/browser/compositor/gpu_process_transport_factory.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_GPU_PROCESS_TRANSPORT_FACTORY_H_
 #define CONTENT_BROWSER_COMPOSITOR_GPU_PROCESS_TRANSPORT_FACTORY_H_
 
 #include <map>
 
 #include "base/id_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "content/browser/compositor/image_transport_factory.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "ui/compositor/compositor.h"
 
 namespace base {
 class SimpleThread;
 class Thread;
 }
 
 namespace cc {
+class SoftwareOutputDevice;
 class SurfaceManager;
 }
 
 namespace content {
 class BrowserCompositorOutputSurface;
 class CompositorSwapClient;
 class ContextProviderCommandBuffer;
+class OutputDeviceBacking;
 class ReflectorImpl;
 class WebGraphicsContext3DCommandBufferImpl;
 
 class GpuProcessTransportFactory
     : public ui::ContextFactory,
       public ImageTransportFactory {
  public:
   GpuProcessTransportFactory();
 
   ~GpuProcessTransportFactory() override;
@@ skipping 29 matching lines @@
   void SetCompositorSuspendedForRecycle(ui::Compositor* compositor,
                                         bool suspended) override;
   bool SurfaceShouldNotShowFramesAfterSuspendForRecycle(
       int surface_id) const override;
 #endif
 
  private:
   struct PerCompositorData;
 
   PerCompositorData* CreatePerCompositorData(ui::Compositor* compositor);
+  scoped_ptr<cc::SoftwareOutputDevice> CreateSoftwareOutputDevice(
+      ui::Compositor* compositor);
   void EstablishedGpuChannel(base::WeakPtr<ui::Compositor> compositor,
                              bool create_gpu_output_surface,
                              int num_attempts);
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> CreateContextCommon(
       scoped_refptr<GpuChannelHost> gpu_channel_host,
       int surface_id);
 
   void OnLostMainThreadSharedContextInsideCallback();
   void OnLostMainThreadSharedContext();
 
   typedef std::map<ui::Compositor*, PerCompositorData*> PerCompositorDataMap;
   PerCompositorDataMap per_compositor_data_;
   scoped_refptr<ContextProviderCommandBuffer> shared_main_thread_contexts_;
   scoped_ptr<GLHelper> gl_helper_;
   ObserverList<ImageTransportFactoryObserver> observer_list_;
   scoped_ptr<cc::SurfaceManager> surface_manager_;
   uint32_t next_surface_id_namespace_;
   scoped_ptr<cc::TaskGraphRunner> task_graph_runner_;
   scoped_ptr<base::SimpleThread> raster_thread_;
 
+#if defined(OS_WIN)
+  scoped_ptr<OutputDeviceBacking> software_backing_;
+#endif
+
   // The contents of this map and its methods may only be used on the compositor
   // thread.
   IDMap<BrowserCompositorOutputSurface> output_surface_map_;
 
   base::WeakPtrFactory<GpuProcessTransportFactory> callback_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessTransportFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_GPU_PROCESS_TRANSPORT_FACTORY_H_