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// Copyright 2016 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 CC_TREES_SWAP_PROMISE_MANAGER_H_
#define CC_TREES_SWAP_PROMISE_MANAGER_H_
#include <set>
#include <vector>
#include "cc/cc_export.h"
#include "cc/trees/swap_promise.h"
namespace cc {
class SwapPromise;
class SwapPromiseMonitor;
class CC_EXPORT SwapPromiseManager {
public:
SwapPromiseManager();
SwapPromiseManager(const SwapPromiseManager&) = delete;
~SwapPromiseManager();
SwapPromiseManager& operator=(const SwapPromiseManager&) = delete;
// Call this function when you expect there to be a swap buffer.
// See swap_promise.h for how to use SwapPromise.
void QueueSwapPromise(std::unique_ptr<SwapPromise> swap_promise);
// When a SwapPromiseMonitor is created on the main thread, it calls
// InsertSwapPromiseMonitor() to register itself with LayerTreeHost.
// When the monitor is destroyed, it calls RemoveSwapPromiseMonitor()
// to unregister itself.
void InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor);
void RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor);
// Called when a commit request is made on the LayerTreeHost.
void NotifySwapPromiseMonitorsOfSetNeedsCommit();
// Called before the commit of the main thread state will be started.
void WillCommit();
// The current swap promise list is moved to the caller.
std::vector<std::unique_ptr<SwapPromise>> TakeSwapPromises();
// Breaks the currently queued swap promises with the specified reason.
void BreakSwapPromises(SwapPromise::DidNotSwapReason reason);
size_t num_queued_swap_promises() const { return swap_promise_list_.size(); }
private:
std::vector<std::unique_ptr<SwapPromise>> swap_promise_list_;
std::set<SwapPromiseMonitor*> swap_promise_monitors_;
};
} // namespace cc
#endif // CC_TREES_SWAP_PROMISE_MANAGER_H_
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