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// 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 "ui/base/prediction/prediction_metrics_handler.h"
#include <memory>
#include "base/test/metrics/histogram_tester.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/base/prediction/input_predictor_unittest_helpers.h"
#include "ui/base/prediction/prediction_unittest_helpers.h"
using base::Bucket;
using testing::ElementsAre;
namespace ui {
namespace test {
namespace {
base::TimeTicks MillisecondsToTestTimeTicks(int64_t ms) {
return PredictionUnittestHelpers::GetStaticTimeStampForTests() +
base::Milliseconds(ms);
}
} // namespace
class PredictionMetricsHandlerTest : public testing::Test {
public:
explicit PredictionMetricsHandlerTest() {}
PredictionMetricsHandlerTest(const PredictionMetricsHandlerTest&) = delete;
PredictionMetricsHandlerTest& operator=(const PredictionMetricsHandlerTest&) =
delete;
void SetUp() override {
metrics_handler_ = std::make_unique<PredictionMetricsHandler>(
"Event.InputEventPrediction.Scroll");
histogram_tester_ = std::make_unique<base::HistogramTester>();
}
int GetInterpolatedEventForPredictedEvent(const base::TimeTicks& timestamp,
gfx::PointF* interpolated) {
return metrics_handler_->GetInterpolatedEventForPredictedEvent(
timestamp, interpolated);
}
::testing::AssertionResult HistogramSizeEq(const char* histogram_name,
int size) {
uint64_t histogram_size =
histogram_tester_->GetAllSamples(histogram_name).size();
if (static_cast<uint64_t>(size) == histogram_size) {
return ::testing::AssertionSuccess();
} else {
return ::testing::AssertionFailure()
<< histogram_name << " expected " << size << " entries, but had "
<< histogram_size;
}
}
bool HasPredictionHistograms() {
uint64_t histogram_size =
histogram_tester_
->GetAllSamples("Event.InputEventPrediction.Scroll.VisualJitter")
.size();
return histogram_size > 0u;
}
void Reset() {
histogram_tester_ = std::make_unique<base::HistogramTester>();
metrics_handler_->Reset();
}
const base::HistogramTester& histogram_tester() { return *histogram_tester_; }
protected:
std::unique_ptr<PredictionMetricsHandler> metrics_handler_;
std::unique_ptr<base::HistogramTester> histogram_tester_;
};
TEST_F(PredictionMetricsHandlerTest, CanComputeMetricsTest) {
base::TimeTicks start_time =
PredictionUnittestHelpers::GetStaticTimeStampForTests();
base::TimeDelta dt = base::Milliseconds(8);
// Need at least 2 real events to start comput metrics.
{
metrics_handler_->AddRealEvent(gfx::PointF(0, 0), start_time + 3 * dt,
start_time);
metrics_handler_->AddPredictedEvent(gfx::PointF(0, 0), start_time + 3 * dt,
start_time);
metrics_handler_->EvaluatePrediction();
EXPECT_FALSE(HasPredictionHistograms());
}
// Need at least a real event strictly after the second predicted event.
Reset();
{
metrics_handler_->AddRealEvent(gfx::PointF(0, 0), start_time, start_time);
metrics_handler_->AddRealEvent(gfx::PointF(0, 0), start_time + dt,
start_time);
metrics_handler_->AddPredictedEvent(gfx::PointF(0, 0), start_time + 2 * dt,
start_time);
metrics_handler_->AddPredictedEvent(gfx::PointF(0, 0), start_time + 3 * dt,
start_time);
metrics_handler_->EvaluatePrediction();
EXPECT_FALSE(HasPredictionHistograms());
metrics_handler_->AddRealEvent(gfx::PointF(0, 0), start_time + 3 * dt,
start_time);
metrics_handler_->EvaluatePrediction();
EXPECT_FALSE(HasPredictionHistograms());
metrics_handler_->AddRealEvent(gfx::PointF(0, 0), start_time + 3.1 * dt,
start_time);
metrics_handler_->EvaluatePrediction();
EXPECT_TRUE(HasPredictionHistograms());
}
}
TEST_F(PredictionMetricsHandlerTest, InterpolationTest) {
base::TimeTicks start_time =
PredictionUnittestHelpers::GetStaticTimeStampForTests();
base::TimeDelta dt = base::Milliseconds(8);
gfx::PointF interpolated;
metrics_handler_->AddRealEvent(gfx::PointF(2, 2), start_time + 1 * dt,
start_time);
metrics_handler_->AddRealEvent(gfx::PointF(3, 3), start_time + 2 * dt,
start_time);
metrics_handler_->AddRealEvent(gfx::PointF(5, 5), start_time + 3 * dt,
start_time);
metrics_handler_->AddRealEvent(gfx::PointF(8, 8), start_time + 4 * dt,
start_time);
EXPECT_EQ(0, GetInterpolatedEventForPredictedEvent(start_time + 1.5 * dt,
&interpolated));
EXPECT_EQ(interpolated, gfx::PointF(2.5, 2.5));
EXPECT_EQ(2, GetInterpolatedEventForPredictedEvent(start_time + 3.5 * dt,
&interpolated));
EXPECT_EQ(interpolated, gfx::PointF(6.5, 6.5));
}
// For test purpose and simplify, we are predicted in the middle of 2 real
// events, which is also the frame time (i.e. a prediction of 4 ms)
void AddEvents(PredictionMetricsHandler* metrics_handler) {
metrics_handler->AddRealEvent(gfx::PointF(1, 1),
MillisecondsToTestTimeTicks(8),
MillisecondsToTestTimeTicks(12)); // R0
metrics_handler->AddRealEvent(gfx::PointF(2, 2),
MillisecondsToTestTimeTicks(16),
MillisecondsToTestTimeTicks(20)); // R1
metrics_handler->AddRealEvent(gfx::PointF(4, 4),
MillisecondsToTestTimeTicks(24),
MillisecondsToTestTimeTicks(28)); // R2
metrics_handler->AddRealEvent(gfx::PointF(7, 7),
MillisecondsToTestTimeTicks(32),
MillisecondsToTestTimeTicks(36)); // R3
metrics_handler->AddRealEvent(gfx::PointF(5, 5),
MillisecondsToTestTimeTicks(40),
MillisecondsToTestTimeTicks(44)); // R4
metrics_handler->AddRealEvent(gfx::PointF(3, 3),
MillisecondsToTestTimeTicks(48),
MillisecondsToTestTimeTicks(54)); // R5
// P0 | Interpolation from R0-R1 is (1.25,1.25)
// P0 | Frame Interpolation from R0-R1 is (1.5,1.5)
// UnderPrediction
metrics_handler->AddPredictedEvent(gfx::PointF(1, 1),
MillisecondsToTestTimeTicks(10),
MillisecondsToTestTimeTicks(12));
// P1 | Interpolation from R1-R2 is (2.5,2.5)
// P1 | Frame Interpolation from R1-R2 is (3,3)
// OverPrediction
metrics_handler->AddPredictedEvent(gfx::PointF(3.5, 3.5),
MillisecondsToTestTimeTicks(18),
MillisecondsToTestTimeTicks(20));
// P2 | Interpolation from R2-R3 is (4.75,4.75)
// P2 | Frame Interpolation from R2-R3 is (5.5,5.5)
// UnderPrediction
metrics_handler->AddPredictedEvent(gfx::PointF(5, 5),
MillisecondsToTestTimeTicks(26),
MillisecondsToTestTimeTicks(28));
// P3 | Interpolation from R3-R4 is (6.5,6.5)
// P3 | Frame Interpolation from R3-R4 is (6,6)
// UnderPrediction
metrics_handler->AddPredictedEvent(gfx::PointF(7, 7),
MillisecondsToTestTimeTicks(34),
MillisecondsToTestTimeTicks(36));
// P4 | Interpolation from R4-R5 is (4.5,4.5)
// P4 | Frame Interpolation from R4-R5 is (4,4)
// OverPrediction
metrics_handler->AddPredictedEvent(gfx::PointF(3, 3),
MillisecondsToTestTimeTicks(42),
MillisecondsToTestTimeTicks(44));
}
TEST_F(PredictionMetricsHandlerTest, PredictionMetricTest) {
AddEvents(metrics_handler_.get());
metrics_handler_->EvaluatePrediction();
EXPECT_THAT(histogram_tester().GetAllSamples(
"Event.InputEventPrediction.Scroll.OverPrediction"),
ElementsAre(Bucket(0, 1), Bucket(1, 1), Bucket(2, 1)));
EXPECT_THAT(histogram_tester().GetAllSamples(
"Event.InputEventPrediction.Scroll.UnderPrediction"),
ElementsAre(Bucket(0, 2)));
EXPECT_THAT(histogram_tester().GetAllSamples(
"Event.InputEventPrediction.Scroll.PredictionScore"),
ElementsAre(Bucket(0, 3), Bucket(1, 1), Bucket(2, 1)));
EXPECT_THAT(histogram_tester().GetAllSamples(
"Event.InputEventPrediction.Scroll.FrameOverPrediction"),
ElementsAre(Bucket(0, 1), Bucket(1, 1)));
EXPECT_THAT(histogram_tester().GetAllSamples(
"Event.InputEventPrediction.Scroll.FrameUnderPrediction"),
ElementsAre(Bucket(0, 2), Bucket(1, 1)));
EXPECT_THAT(histogram_tester().GetAllSamples(
"Event.InputEventPrediction.Scroll.FramePredictionScore"),
ElementsAre(Bucket(0, 3), Bucket(1, 2)));
EXPECT_THAT(histogram_tester().GetAllSamples(
"Event.InputEventPrediction.Scroll.PredictionJitter"),
ElementsAre(Bucket(0, 1), Bucket(1, 2), Bucket(2, 1)));
EXPECT_THAT(histogram_tester().GetAllSamples(
"Event.InputEventPrediction.Scroll.VisualJitter"),
ElementsAre(Bucket(1, 2), Bucket(2, 2)));
}
// Test that it doesn't crash when predicted event is prior to first real event.
TEST_F(PredictionMetricsHandlerTest, PredictedTimePriorToReal) {
metrics_handler_->AddRealEvent(gfx::PointF(1, 1),
MillisecondsToTestTimeTicks(8),
MillisecondsToTestTimeTicks(12));
metrics_handler_->AddRealEvent(gfx::PointF(2, 2),
MillisecondsToTestTimeTicks(10),
MillisecondsToTestTimeTicks(12));
metrics_handler_->AddPredictedEvent(gfx::PointF(0, 0),
MillisecondsToTestTimeTicks(7),
MillisecondsToTestTimeTicks(12));
metrics_handler_->EvaluatePrediction();
// No prediction metrics result.
EXPECT_TRUE(
HistogramSizeEq("Event.InputEventPrediction.Scroll.PredictionJitter", 0));
}
} // namespace test
} // namespace ui
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