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// Copyright 2016 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 COMPONENTS_VIZ_SERVICE_SURFACES_SURFACE_OBSERVER_H_
#define COMPONENTS_VIZ_SERVICE_SURFACES_SURFACE_OBSERVER_H_
namespace viz {
class SurfaceId;
class SurfaceInfo;
struct BeginFrameAck;
struct BeginFrameArgs;
class SurfaceObserver {
public:
// Called when a CompositorFrame with a new SurfaceId activates for the first
// time.
virtual void OnFirstSurfaceActivation(const SurfaceInfo& surface_info) = 0;
// Called when a CompositorFrame within |surface| activates.
virtual void OnSurfaceActivated(const SurfaceId& surface_id) = 0;
// Called when a Surface was marked to be destroyed.
virtual void OnSurfaceDestroyed(const SurfaceId& surface_id) = 0;
// Called when a Surface is modified, e.g. when a CompositorFrame is
// activated, its producer confirms that no CompositorFrame will be submitted
// in response to a BeginFrame, or a CopyOutputRequest is issued.
//
// |ack.sequence_number| is only valid if called in response to a BeginFrame.
// Should return true if this causes a Display to be damaged.
virtual bool OnSurfaceDamaged(const SurfaceId& surface_id,
const BeginFrameAck& ack) = 0;
// Called when a surface is garbage-collected.
virtual void OnSurfaceDiscarded(const SurfaceId& surface_id) = 0;
// Called when a Surface's CompositorFrame producer has received a BeginFrame
// and, thus, is expected to produce damage soon.
virtual void OnSurfaceDamageExpected(const SurfaceId& surface_id,
const BeginFrameArgs& args) = 0;
// Called when a surface has been added to the aggregated CompositorFrame.
virtual void OnSurfaceWillDraw(const SurfaceId& surface_id) = 0;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_SURFACES_SURFACE_OBSERVER_H_
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