1 // Copyright (c) 2012 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 UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_ 6 #define UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_ 7 8 #include "base/time/time.h" 9 #include "ui/compositor/compositor_export.h" 10 11 namespace ui { 12 13 class Compositor; 14 15 // A compositor observer is notified when compositing completes. 16 class COMPOSITOR_EXPORT CompositorObserver { 17 public: 18 // A commit proxies information from the main thread to the compositor 19 // thread. It typically happens when some state changes that will require a 20 // composite. In the multi-threaded case, many commits may happen between 21 // two successive composites. In the single-threaded, a single commit 22 // between two composites (just before the composite as part of the 23 // composite cycle). If the compositor is locked, it will not send this 24 // this signal. 25 virtual void OnCompositingDidCommit(Compositor* compositor) = 0; 26 27 // Called when compositing started: it has taken all the layer changes into 28 // account and has issued the graphics commands. 29 virtual void OnCompositingStarted(Compositor* compositor, 30 base::TimeTicks start_time) = 0; 31 32 // Called when compositing completes: the present to screen has completed. 33 virtual void OnCompositingEnded(Compositor* compositor) = 0; 34 35 // Called when compositing is aborted (e.g. lost graphics context). 36 virtual void OnCompositingAborted(Compositor* compositor) = 0; 37 38 // Called when the compositor lock state changes. 39 virtual void OnCompositingLockStateChanged(Compositor* compositor) = 0; 40 41 protected: 42 virtual ~CompositorObserver() {} 43 }; 44 45 } // namespace ui 46 47 #endif // UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_ 48
