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1 // Copyright 2013 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 CC_BASE_SWAP_PROMISE_MONITOR_H_
6 #define CC_BASE_SWAP_PROMISE_MONITOR_H_
7 
8 #include "cc/base/cc_export.h"
9 
10 namespace cc {
11 
12 class LayerTreeHost;
13 class LayerTreeHostImpl;
14 
15 // A SwapPromiseMonitor is used to monitor compositor state change that
16 // should be associated with a SwapPromise, e.g. SetNeedsCommit() is
17 // called on main thread or SetNeedsRedraw() is called on impl thread.
18 // Creating a SwapPromiseMonitor will insert itself into a LayerTreeHost
19 // or LayerTreeHostImpl. You must provide a pointer to the appropriate
20 // structure to the monitor (and only one of the two). Notification of
21 // compositor state change will be sent through OnSetNeedsCommitOnMain()
22 // or OnSetNeedsRedrawOnImpl(). When SwapPromiseMonitor is destroyed, it
23 // will unregister itself from LayerTreeHost or LayerTreeHostImpl.
24 class CC_EXPORT SwapPromiseMonitor {
25  public:
26   // If the monitor lives on the main thread, pass in layer_tree_host
27   // and set layer_tree_host_impl to NULL.
28   // If the monitor lives on the impl thread, pass in layer_tree_host_impl
29   // and set layer_tree_host to NULL.
30   SwapPromiseMonitor(LayerTreeHost* layer_tree_host,
31                      LayerTreeHostImpl* layer_tree_host_impl);
32   virtual ~SwapPromiseMonitor();
33 
34   virtual void OnSetNeedsCommitOnMain() = 0;
35   virtual void OnSetNeedsRedrawOnImpl() = 0;
36   virtual void OnForwardScrollUpdateToMainThreadOnImpl() = 0;
37 
38  protected:
39   LayerTreeHost* layer_tree_host_;
40   LayerTreeHostImpl* layer_tree_host_impl_;
41 };
42 
43 }  // namespace cc
44 
45 #endif  // CC_BASE_SWAP_PROMISE_MONITOR_H_
46