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// Copyright 2013 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_MONITOR_H_
#define CC_TREES_SWAP_PROMISE_MONITOR_H_
#include "cc/base/cc_export.h"
namespace cc {
class LayerTreeHost;
class LayerTreeHostImpl;
// A SwapPromiseMonitor is used to monitor compositor state change that
// should be associated with a SwapPromise, e.g. SetNeedsCommit() is
// called on main thread or SetNeedsRedraw() is called on impl thread.
// Creating a SwapPromiseMonitor will insert itself into a LayerTreeHost
// or LayerTreeHostImpl. You must provide a pointer to the appropriate
// structure to the monitor (and only one of the two). Notification of
// compositor state change will be sent through OnSetNeedsCommitOnMain()
// or OnSetNeedsRedrawOnImpl(). When SwapPromiseMonitor is destroyed, it
// will unregister itself from LayerTreeHost or LayerTreeHostImpl.
class CC_EXPORT SwapPromiseMonitor {
public:
// If the monitor lives on the main thread, pass in layer_tree_host
// and set layer_tree_host_impl to nullptr.
// If the monitor lives on the impl thread, pass in layer_tree_host_impl
// and set layer_tree_host to nullptr.
SwapPromiseMonitor(LayerTreeHost* layer_tree_host,
LayerTreeHostImpl* layer_tree_host_impl);
virtual ~SwapPromiseMonitor();
virtual void OnSetNeedsCommitOnMain() = 0;
virtual void OnSetNeedsRedrawOnImpl() = 0;
virtual void OnForwardScrollUpdateToMainThreadOnImpl() = 0;
protected:
LayerTreeHost* layer_tree_host_;
LayerTreeHostImpl* layer_tree_host_impl_;
};
} // namespace cc
#endif // CC_TREES_SWAP_PROMISE_MONITOR_H_
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