chromium/components/viz/service/display/frame_rate_decider.cc

// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/viz/service/display/frame_rate_decider.h"

#include <algorithm>
#include <utility>

#include "base/metrics/histogram_macros.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "components/viz/common/constants.h"
#include "components/viz/common/features.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
#include "components/viz/service/surfaces/surface.h"
#include "components/viz/service/surfaces/surface_manager.h"
#include "media/filters/video_cadence_estimator.h"

namespace viz {
namespace {

// The minimum number of frames for which a frame interval preference should
// persist before we toggle to it. This is only applied when lowering the frame
// rate. If the new preference is higher than the current setting, it is applied
// immediately.
constexpr size_t kMinNumOfFramesToToggleInterval = …;

bool AreAlmostEqual(base::TimeDelta a, base::TimeDelta b) { … }

}  // namespace

FrameRateDecider::ScopedAggregate::ScopedAggregate(FrameRateDecider* decider)
    : … { … }

FrameRateDecider::ScopedAggregate::~ScopedAggregate() { … }

FrameRateDecider::FrameRateDecider(SurfaceManager* surface_manager,
                                   Client* client,
                                   bool hw_support_for_multiple_refresh_rates,
                                   bool output_surface_supports_set_frame_rate)
    : … { … }

FrameRateDecider::~FrameRateDecider() { … }

void FrameRateDecider::SetSupportedFrameIntervals(
    base::flat_set<base::TimeDelta> supported_intervals) { … }

void FrameRateDecider::OnSurfaceWillBeDrawn(Surface* surface) { … }

void FrameRateDecider::StartAggregation() { … }

void FrameRateDecider::EndAggregation() { … }

void FrameRateDecider::UpdatePreferredFrameIntervalIfNeeded() { … }

ToggleFrameRateCase FrameRateDecider::GetToggleFrameRateCase(
    const std::vector<base::TimeDelta>& fixed_interval_frame_sink_intervals)
    const { … }

void FrameRateDecider::SetPreferredInterval(
    base::TimeDelta new_preferred_interval) { … }

bool FrameRateDecider::multiple_refresh_rates_supported() const { … }

void FrameRateDecider::SetHwSupportForMultipleRefreshRates(bool support) { … }

}  // namespace viz