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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/trees/frame_rate_estimator.h"
#include <array>
#include <memory>
#include "base/test/simple_test_tick_clock.h"
#include "base/test/test_simple_task_runner.h"
#include "base/time/time.h"
#include "cc/base/features.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cc {
namespace {
class FrameRateEstimatorTest : public testing::Test {
public:
FrameRateEstimatorTest() = default;
~FrameRateEstimatorTest() override = default;
void SetUp() override {
task_runner_ = base::MakeRefCounted<base::TestSimpleTaskRunner>();
estimator_ = std::make_unique<FrameRateEstimator>(task_runner_.get());
}
void TearDown() override {
estimator_.reset();
task_runner_.reset();
}
protected:
scoped_refptr<base::TestSimpleTaskRunner> task_runner_;
base::SimpleTestTickClock test_tick_clock_;
std::unique_ptr<FrameRateEstimator> estimator_;
};
TEST_F(FrameRateEstimatorTest, ToggleEstimationEnabled) {
EXPECT_EQ(estimator_->GetPreferredInterval(),
viz::BeginFrameArgs::MinInterval());
estimator_->SetVideoConferenceMode(true);
EXPECT_NE(estimator_->GetPreferredInterval(),
viz::BeginFrameArgs::MinInterval());
estimator_->SetVideoConferenceMode(false);
EXPECT_EQ(estimator_->GetPreferredInterval(),
viz::BeginFrameArgs::MinInterval());
}
TEST_F(FrameRateEstimatorTest, FrameHistoryUsed) {
estimator_->SetVideoConferenceMode(true);
EXPECT_NE(estimator_->GetPreferredInterval(),
viz::BeginFrameArgs::MinInterval());
base::TimeTicks time;
for (int i = 0; i < 10; ++i) {
estimator_->WillDraw(time);
time += viz::BeginFrameArgs::DefaultInterval();
}
EXPECT_EQ(estimator_->GetPreferredInterval(),
viz::BeginFrameArgs::MinInterval());
estimator_->WillDraw(time + (3 * viz::BeginFrameArgs::DefaultInterval()));
EXPECT_NE(estimator_->GetPreferredInterval(),
viz::BeginFrameArgs::MinInterval());
}
TEST_F(FrameRateEstimatorTest, InputPriorityMode) {
estimator_->SetVideoConferenceMode(true);
estimator_->NotifyInputEvent();
EXPECT_EQ(estimator_->GetPreferredInterval(),
viz::BeginFrameArgs::MinInterval());
task_runner_->RunUntilIdle();
EXPECT_NE(estimator_->GetPreferredInterval(),
viz::BeginFrameArgs::MinInterval());
}
TEST_F(FrameRateEstimatorTest, RafAtHalfFps) {
estimator_->SetVideoConferenceMode(true);
// Recorded rAF intervals at 30 fps.
const auto kIntervals = std::to_array<base::TimeDelta>({
base::Microseconds(33425),
base::Microseconds(33298),
base::Microseconds(33396),
base::Microseconds(33339),
base::Microseconds(33431),
base::Microseconds(33320),
base::Microseconds(33364),
base::Microseconds(33360),
});
const base::TimeDelta kIntervalForHalfFps =
viz::BeginFrameArgs::DefaultInterval() * 2;
base::TimeTicks time;
for (size_t i = 0; i <= std::size(kIntervals); ++i) {
estimator_->WillDraw(time);
EXPECT_EQ(kIntervalForHalfFps, estimator_->GetPreferredInterval());
if (i < std::size(kIntervals))
time += kIntervals[i];
}
}
} // namespace
} // namespace cc
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