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// Copyright (c) 2010 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 CHROME_GPU_GPU_CHANNEL_H_
#define CHROME_GPU_GPU_CHANNEL_H_
#include <string>
#include "base/hash_tables.h"
#include "base/ref_counted.h"
#include "base/scoped_open_process.h"
#include "build/build_config.h"
#include "chrome/common/message_router.h"
#include "chrome/gpu/gpu_command_buffer_stub.h"
#include "ipc/ipc_channel.h"
#include "ipc/ipc_message.h"
#include "ipc/ipc_sync_channel.h"
// Encapsulates an IPC channel between the GPU process and one renderer
// process. On the renderer side there's a corresponding GpuChannelHost.
class GpuChannel : public IPC::Channel::Listener,
public IPC::Message::Sender,
public base::RefCountedThreadSafe<GpuChannel> {
public:
// Get a new GpuChannel object for the current process to talk to the
// given renderer process. The renderer ID is an opaque unique ID generated
// by the browser.
//
// POSIX only: If |channel_fd| > 0, use that file descriptor for the
// channel socket.
static GpuChannel* EstablishGpuChannel(int renderer_id);
virtual ~GpuChannel();
std::string channel_name() const { return channel_name_; }
base::ProcessHandle renderer_handle() const {
return renderer_process_.handle();
}
#if defined(OS_POSIX)
// When first created, the GpuChannel gets assigned the file descriptor
// for the renderer.
// After the first time we pass it through the IPC, we don't need it anymore,
// and we close it. At that time, we reset renderer_fd_ to -1.
int DisownRendererFd() {
int value = renderer_fd_;
renderer_fd_ = -1;
return value;
}
#endif
// IPC::Channel::Listener implementation:
virtual void OnMessageReceived(const IPC::Message& msg);
virtual void OnChannelConnected(int32 peer_pid);
virtual void OnChannelError();
// IPC::Message::Sender implementation:
virtual bool Send(IPC::Message* msg);
private:
// Called on the plugin thread
GpuChannel();
bool Init(const std::string& channel_name);
void OnControlMessageReceived(const IPC::Message& msg);
int GenerateRouteID();
// Message handlers.
void OnCreateCommandBuffer(int* instance_id);
void OnDestroyCommandBuffer(int instance_id);
scoped_ptr<IPC::SyncChannel> channel_;
std::string channel_name_;
// Handle to the renderer process who is on the other side of the channel.
base::ScopedOpenProcess renderer_process_;
// The id of the renderer who is on the other side of the channel.
int renderer_id_;
#if defined(OS_POSIX)
// FD for the renderer end of the pipe. It is stored until we send it over
// IPC after which it is cleared. It will be closed by the IPC mechanism.
int renderer_fd_;
#endif
// Used to implement message routing functionality to CommandBuffer objects
MessageRouter router_;
#if defined(ENABLE_GPU)
typedef base::hash_map<int, scoped_refptr<GpuCommandBufferStub> > StubMap;
StubMap stubs_;
#endif
bool log_messages_; // True if we should log sent and received messages.
DISALLOW_COPY_AND_ASSIGN(GpuChannel);
};
#endif // CHROME_GPU_GPU_CHANNEL_H_
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