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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.
#ifndef UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_
#define UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_
#include "base/time/time.h"
#include "ui/compositor/compositor_export.h"
namespace viz {
class LocalSurfaceIdAllocation;
}
namespace ui {
class Compositor;
// A compositor observer is notified when compositing completes.
class COMPOSITOR_EXPORT CompositorObserver {
public:
virtual ~CompositorObserver() = default;
// 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 a child of the compositor is resizing.
virtual void OnCompositingChildResizing(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;
// Called (asynchronously) when the compositor generates a new
// LocalSurfaceIdAllocation. For example, if
// LayerTreeHost::RequestNewLocalSurfaceId() is called, then this function
// is called once the compositor generates the new LocalSurfaceIdAllocation.
virtual void DidGenerateLocalSurfaceIdAllocation(
Compositor* compositor,
const viz::LocalSurfaceIdAllocation& allocation) {}
};
} // namespace ui
#endif // UI_COMPOSITOR_COMPOSITOR_OBSERVER_H_