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#pragma once
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <condition_variable>
#include <memory>
#include <mutex>
#include <unordered_map>
#include "common/libs/threads/thread_annotations.h"
#include "host/frontend/vnc_server/vnc_utils.h"
namespace cvd {
namespace vnc {
class VncClientConnection;
class FrameBufferWatcher;
using StripePtrVec = std::vector<std::shared_ptr<const Stripe>>;
using SeqNumberVec = std::vector<StripeSeqNumber>;
SeqNumberVec MakeSeqNumberVec();
class BlackBoard {
private:
struct ClientFBUState {
bool ready_to_receive{};
ScreenOrientation orientation{};
std::condition_variable new_frame_cv;
SeqNumberVec stripe_seq_nums = MakeSeqNumberVec();
bool closed{};
};
public:
class Registerer {
public:
Registerer(BlackBoard* bb, const VncClientConnection* conn)
: bb_{bb}, conn_{conn} {
bb->Register(conn);
}
~Registerer() { bb_->Unregister(conn_); }
Registerer(const Registerer&) = delete;
Registerer& operator=(const Registerer&) = delete;
private:
BlackBoard* bb_{};
const VncClientConnection* conn_{};
};
BlackBoard() = default;
BlackBoard(const BlackBoard&) = delete;
BlackBoard& operator=(const BlackBoard&) = delete;
bool NoNewStripesFor(const SeqNumberVec& seq_nums) const REQUIRES(m_);
void NewStripeReady(int index, StripeSeqNumber seq_num);
void Register(const VncClientConnection* conn);
void Unregister(const VncClientConnection* conn);
StripePtrVec WaitForSenderWork(const VncClientConnection* conn);
void WaitForAtLeastOneClientConnection();
void FrameBufferUpdateRequestReceived(const VncClientConnection* conn);
// Setting orientation implies needing the entire screen
void SetOrientation(const VncClientConnection* conn,
ScreenOrientation orientation);
void SignalClientNeedsEntireScreen(const VncClientConnection* conn);
void StopWaiting(const VncClientConnection* conn);
void set_frame_buffer_watcher(FrameBufferWatcher* frame_buffer_watcher);
// quality_level must be the value received from the client, in the range
// [kJpegMinQualityEncoding, kJpegMaxQualityEncoding], else it is ignored.
void set_jpeg_quality_level(int quality_level);
int jpeg_quality_level() const {
std::lock_guard<std::mutex> guard(m_);
return jpeg_quality_level_;
}
private:
ClientFBUState& GetStateForClient(const VncClientConnection* conn)
REQUIRES(m_);
static void ResetToZero(SeqNumberVec* seq_nums);
mutable std::mutex m_;
SeqNumberVec most_recent_stripe_seq_nums_ GUARDED_BY(m_) = MakeSeqNumberVec();
std::unordered_map<const VncClientConnection*, ClientFBUState> clients_
GUARDED_BY(m_);
int jpeg_quality_level_ GUARDED_BY(m_) = 100;
std::condition_variable new_client_cv_;
// NOTE the FrameBufferWatcher pointer itself should be
// guarded, but not the pointee.
FrameBufferWatcher* frame_buffer_watcher_ GUARDED_BY(m_){};
};
} // namespace vnc
} // namespace cvd
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