chromium/components/viz/common/quads/frame_deadline.h

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_VIZ_COMMON_QUADS_FRAME_DEADLINE_H_
#define COMPONENTS_VIZ_COMMON_QUADS_FRAME_DEADLINE_H_

#include <optional>
#include <string>

#include "base/time/time.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
#include "components/viz/common/viz_common_export.h"

namespace viz {

// FrameDeadline is a class that represents a CompositorFrame's deadline for
// activation. The deadline consists of three components: start time, deadline
// in frames, and frame interval. All three components are stored individually
// in this class in order to allow resolution of this deadline that incorporates
// a system default deadline in the Viz service. In particular, the computation
// to translate FrameDeadline into wall time is:
// if use system default lower bound deadline:
//    start time + max(deadline in frames, default deadline) * frame interval
// else:
//    start time + deadline in frames * frame interval
class VIZ_COMMON_EXPORT FrameDeadline { … };

VIZ_COMMON_EXPORT std::ostream& operator<<(std::ostream& out,
                                           const FrameDeadline& frame_deadline);

}  // namespace viz

#endif  // COMPONENTS_VIZ_COMMON_QUADS_FRAME_DEADLINE_H_