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// Copyright (c) 2012 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.
#include "base/time/time.h"
#include "ui/compositor/compositor_export.h"
namespace ui {
class Compositor;
// A compositor observer is notified when compositing completes.
class COMPOSITOR_EXPORT CompositorObserver {
// A commit proxies information from the main thread to the compositor
// thread. It typically happens when some state changes that will require a
// composite. In the multi-threaded case, many commits may happen between
// two successive composites. In the single-threaded, a single commit
// between two composites (just before the composite as part of the
// composite cycle). If the compositor is locked, it will not send this
// this signal.
virtual void OnCompositingDidCommit(Compositor* compositor) = 0;
// Called when compositing started: it has taken all the layer changes into
// account and has issued the graphics commands.
virtual void OnCompositingStarted(Compositor* compositor,
base::TimeTicks start_time) = 0;
// Called when compositing completes: the present to screen has completed.
virtual void OnCompositingEnded(Compositor* compositor) = 0;
// Called when compositing is aborted (e.g. lost graphics context).
virtual void OnCompositingAborted(Compositor* compositor) = 0;
// Called when the compositor lock state changes.
virtual void OnCompositingLockStateChanged(Compositor* compositor) = 0;
// Called at the top of the compositor's destructor, to give observers a
// chance to remove themselves.
virtual void OnCompositingShuttingDown(Compositor* compositor) = 0;
} // namespace ui