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// Copyright 2024 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_interval_decider.h"
#include <inttypes.h>
#include <utility>
#include <variant>
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_functions.h"
#include "base/rand_util.h"
#include "base/trace_event/trace_event.h"
#include "components/viz/common/quads/frame_interval_inputs.h"
#include "components/viz/service/surfaces/surface.h"
#include "components/viz/service/surfaces/surface_manager.h"
#include "third_party/abseil-cpp/absl/functional/overload.h"
namespace viz {
FrameIntervalDecider::ScopedAggregate::ScopedAggregate(
FrameIntervalDecider& decider,
SurfaceManager& surface_manager,
base::TimeTicks frame_time)
: decider_(decider),
surface_manager_(surface_manager),
frame_time_(frame_time) {
surface_manager_->AddObserver(this);
}
FrameIntervalDecider::ScopedAggregate::~ScopedAggregate() {
surface_manager_->RemoveObserver(this);
decider_->Decide(frame_time_, std::move(drawn_frame_sinks_));
}
void FrameIntervalDecider::ScopedAggregate::OnSurfaceWillBeDrawn(
Surface* surface) {
drawn_frame_sinks_.emplace(surface->surface_id().frame_sink_id(),
surface->GetFrameIntervalInputs());
}
FrameIntervalDecider::FrameIntervalDecider() = default;
FrameIntervalDecider::~FrameIntervalDecider() = default;
void FrameIntervalDecider::UpdateSettings(
Settings settings,
std::vector<std::unique_ptr<FrameIntervalMatcher>> matchers) {
std::visit(absl::Overload(
[](const std::monostate& monostate) {},
[](const FixedIntervalSettings& fixed_interval_settings) {
CHECK(!fixed_interval_settings.supported_intervals.empty());
},
[](const ContinuousRangeSettings& continuous_range_settings) {
CHECK_LE(continuous_range_settings.min_interval,
continuous_range_settings.max_interval);
}),
settings.interval_settings);
settings_ = std::move(settings);
matchers_ = std::move(matchers);
}
FrameIntervalDecider::ScopedAggregate FrameIntervalDecider::WrapAggregate(
SurfaceManager& surface_manager,
base::TimeTicks frame_time) {
return FrameIntervalDecider::ScopedAggregate(*this, surface_manager,
frame_time);
}
void FrameIntervalDecider::Decide(
base::TimeTicks frame_time,
base::flat_map<FrameSinkId, FrameIntervalInputs> inputs_map) {
FrameIntervalMatcher::Inputs matcher_inputs(settings_, frame_id_++);
matcher_inputs.aggregated_frame_time = frame_time;
matcher_inputs.inputs_map = std::move(inputs_map);
TRACE_EVENT_INSTANT(TRACE_DISABLED_BY_DEFAULT("cc.debug"),
"FrameIntervalMatcherInputs", "inputs", matcher_inputs);
// Run through matchers in order and use the first non-null result.
std::optional<Result> match_result;
FrameIntervalMatcherType matcher_type = FrameIntervalMatcherType::kNone;
for (const auto& matcher : matchers_) {
match_result = matcher->Match(matcher_inputs);
if (match_result) {
matcher_type = matcher->type();
break;
}
}
if (base::ShouldRecordSubsampledMetric(0.001)) {
base::UmaHistogramEnumeration("Viz.FrameIntervalDecider.ResultMatcherType",
matcher_type);
if (match_result &&
std::holds_alternative<ResultInterval>(match_result.value())) {
base::UmaHistogramCustomTimes(
"Viz.FrameIntervalDecider.ResultTimeDelta",
std::get<ResultInterval>(match_result.value()).interval,
base::Milliseconds(0), base::Milliseconds(500), 50);
}
}
// If nothing matched, use the default.
if (!match_result) {
match_result = std::visit(
absl::Overload(
[](const std::monostate& monostate) -> Result {
return FrameIntervalClass::kDefault;
},
[](const FixedIntervalSettings& fixed_interval_settings) -> Result {
return ResultInterval{fixed_interval_settings.default_interval};
},
[](const ContinuousRangeSettings& continuous_range_settings)
-> Result {
return ResultInterval{continuous_range_settings.default_interval};
}),
settings_.interval_settings);
}
// No need to notify client if result did not change.
if (current_result_ == match_result) {
current_result_frame_time_ = frame_time;
return;
}
// Same as above but using epsilon comparison for frame interval.
if (current_result_ && match_result &&
std::holds_alternative<ResultInterval>(current_result_.value()) &&
std::holds_alternative<ResultInterval>(match_result.value()) &&
FrameIntervalMatcher::AreAlmostEqual(
std::get<ResultInterval>(current_result_.value()).interval,
std::get<ResultInterval>(match_result.value()).interval,
settings_.epsilon)) {
current_result_frame_time_ = frame_time;
return;
}
// If result is increasing frame interval, then ensure the it's not a blip by
// delaying updating client. Allow reducing frame interval immediately
// however.
if (frame_time - current_result_frame_time_ >
settings_.increase_frame_interval_timeout ||
MayDecreaseFrameInterval(current_result_, match_result)) {
TRACE_EVENT_INSTANT(
"viz", "FrameIntervalDeciderResult", "result",
FrameIntervalMatcher::ResultToString(match_result.value()),
"matcher_type",
FrameIntervalMatcher::MatcherTypeToString(matcher_type));
current_result_frame_time_ = frame_time;
current_result_ = match_result;
if (settings_.result_callback) {
settings_.result_callback.Run(match_result.value(), matcher_type);
}
}
}
// static
bool FrameIntervalDecider::MayDecreaseFrameInterval(
const std::optional<Result>& from,
const std::optional<Result>& to) {
if (!from || !to) {
return true;
}
return std::visit(
absl::Overload(
[&](FrameIntervalClass from_frame_interval_class) {
if (!std::holds_alternative<FrameIntervalClass>(to.value())) {
return true;
}
FrameIntervalClass to_frame_interval_class =
std::get<FrameIntervalClass>(to.value());
return static_cast<int>(from_frame_interval_class) >
static_cast<int>(to_frame_interval_class);
},
[&](ResultInterval from_interval) {
if (!std::holds_alternative<ResultInterval>(to.value())) {
return true;
}
ResultInterval to_interval = std::get<ResultInterval>(to.value());
return from_interval.interval > to_interval.interval;
}),
from.value());
}
} // namespace viz
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