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media / base / win / overlay_state_observer_subscription.h [blame]
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_BASE_WIN_OVERLAY_STATE_OBSERVER_SUBSCRIPTION_H_
#define MEDIA_BASE_WIN_OVERLAY_STATE_OBSERVER_SUBSCRIPTION_H_
#include "base/functional/callback.h"
namespace gpu {
struct Mailbox;
}
namespace media {
// OverlayStateObserverSubscription is an empty interface class which allows a
// media component (e.g. MediaFoundationRendererClient) to manage a reference
// to an OverlayStateObserver implementation where a reference to the concrete
// implementation may not be allowed as a result of the dependency chain (e.g.
// a concrete implementation in //content).
//
// No additional interface methods are required as creation parameters (a
// Mailbox & notification callback) may be provided at the time the object is
// constructed. All further interactions between the OverlayStateObserver and a
// subscribing component flow from the OverlayStateObserver to the subscriber
// via the notification callback using a push model.
class OverlayStateObserverSubscription {
public:
virtual ~OverlayStateObserverSubscription() = default;
// The bool parameter indicates if the surface was promoted to an overlay.
using StateChangedCB = base::RepeatingCallback<void(bool)>;
};
using ObserveOverlayStateCB = base::RepeatingCallback<
std::unique_ptr<media::OverlayStateObserverSubscription>(
const gpu::Mailbox& mailbox,
OverlayStateObserverSubscription::StateChangedCB on_state_changed_cb)>;
} // namespace media
#endif // MEDIA_BASE_WIN_OVERLAY_STATE_OBSERVER_SUBSCRIPTION_H_