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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/memory/linked_ptr.h"
     11 #include "base/memory/ref_counted.h"
     12 #include "base/memory/scoped_ptr.h"
     13 #include "base/memory/weak_ptr.h"
     14 #include "base/sequenced_task_runner_helpers.h"
     15 #include "content/common/gpu/gpu_process_launch_causes.h"
     16 #include "content/public/browser/browser_message_filter.h"
     17 #include "ui/gfx/native_widget_types.h"
     18 
     19 class GpuProcessHost;
     20 struct GPUCreateCommandBufferConfig;
     21 
     22 namespace gpu {
     23 struct GPUInfo;
     24 }
     25 
     26 namespace content {
     27 class RenderWidgetHelper;
     28 class RenderWidgetHostViewFrameSubscriber;
     29 
     30 // A message filter for messages from the renderer to the GpuProcessHost(UIShim)
     31 // in the browser. Such messages are typically destined for the GPU process,
     32 // but need to be mediated by the browser.
     33 class GpuMessageFilter : public BrowserMessageFilter {
     34  public:
     35   GpuMessageFilter(int render_process_id,
     36                    RenderWidgetHelper* render_widget_helper);
     37 
     38   // BrowserMessageFilter methods:
     39   virtual bool OnMessageReceived(const IPC::Message& message,
     40                                  bool* message_was_ok) OVERRIDE;
     41 
     42   // Signals that the handle for a surface id was updated, and it may be time to
     43   // unblock existing CreateViewCommandBuffer requests using that surface.
     44   void SurfaceUpdated(int32 surface_id);
     45 
     46   // This set of API is used to subscribe to frame presentation events.
     47   // See RenderWidgetHostViewFrameSubscriber for more details.
     48   void BeginFrameSubscription(
     49       int route_id,
     50       scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber);
     51   void EndFrameSubscription(int route_id);
     52 
     53  private:
     54   friend class BrowserThread;
     55   friend class base::DeleteHelper<GpuMessageFilter>;
     56   struct CreateViewCommandBufferRequest;
     57   struct FrameSubscription;
     58 
     59   virtual ~GpuMessageFilter();
     60 
     61   // Message handlers called on the browser IO thread:
     62   void OnEstablishGpuChannel(CauseForGpuLaunch,
     63                              IPC::Message* reply);
     64   void OnCreateViewCommandBuffer(
     65       int32 surface_id,
     66       const GPUCreateCommandBufferConfig& init_params,
     67       IPC::Message* reply);
     68   // Helper callbacks for the message handlers.
     69   void EstablishChannelCallback(scoped_ptr<IPC::Message> reply,
     70                                 const IPC::ChannelHandle& channel,
     71                                 const gpu::GPUInfo& gpu_info);
     72   void CreateCommandBufferCallback(scoped_ptr<IPC::Message> reply,
     73                                    int32 route_id);
     74 
     75   void BeginAllFrameSubscriptions();
     76   void EndAllFrameSubscriptions();
     77   void BeginFrameSubscriptionInternal(
     78       linked_ptr<FrameSubscription> subscription);
     79   void EndFrameSubscriptionInternal(
     80       linked_ptr<FrameSubscription> subscription);
     81 
     82   int gpu_process_id_;
     83   int render_process_id_;
     84   bool share_contexts_;
     85 
     86   scoped_refptr<RenderWidgetHelper> render_widget_helper_;
     87   std::vector<linked_ptr<CreateViewCommandBufferRequest> > pending_requests_;
     88 
     89   base::WeakPtrFactory<GpuMessageFilter> weak_ptr_factory_;
     90 
     91   typedef std::vector<linked_ptr<FrameSubscription> > FrameSubscriptionList;
     92   FrameSubscriptionList frame_subscription_list_;
     93 
     94   DISALLOW_COPY_AND_ASSIGN(GpuMessageFilter);
     95 };
     96 
     97 }  // namespace content
     98 
     99 #endif  // CONTENT_BROWSER_RENDERER_HOST_GPU_MESSAGE_FILTER_H_
    100