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// Copyright 2011 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/common/frame_sinks/delay_based_time_source.h"
#include <stdint.h>
#include "base/test/simple_test_tick_clock.h"
#include "base/test/test_mock_time_task_runner.h"
#include "components/viz/test/fake_delay_based_time_source.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace viz {
namespace {
base::TimeDelta Interval() {
return base::Microseconds(base::Time::kMicrosecondsPerSecond / 60);
}
class DelayBasedTimeSourceTest : public ::testing::Test {
protected:
void SetUp() override {
task_runner_ = base::MakeRefCounted<base::TestMockTimeTaskRunner>();
delay_based_time_source_ = std::make_unique<FakeDelayBasedTimeSource>(
task_runner_->GetMockTickClock(), task_runner_.get());
delay_based_time_source_->SetClient(&client_);
}
void TearDown() override {
delay_based_time_source_.reset();
task_runner_ = nullptr;
}
base::TestMockTimeTaskRunner* task_runner() { return task_runner_.get(); }
FakeDelayBasedTimeSource* timer() { return delay_based_time_source_.get(); }
FakeDelayBasedTimeSourceClient* client() { return &client_; }
FakeDelayBasedTimeSourceClient client_;
scoped_refptr<base::TestMockTimeTaskRunner> task_runner_;
std::unique_ptr<FakeDelayBasedTimeSource> delay_based_time_source_;
};
TEST_F(DelayBasedTimeSourceTest, TaskPostedAndTickCalled) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
EXPECT_TRUE(timer()->Active());
EXPECT_TRUE(task_runner()->HasPendingTask());
task_runner()->AdvanceMockTickClock(Interval());
task_runner()->RunUntilIdle();
EXPECT_TRUE(timer()->Active());
EXPECT_TRUE(client()->TickCalled());
}
TEST_F(DelayBasedTimeSourceTest, TickNotCalledWithTaskPosted) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
EXPECT_TRUE(task_runner()->HasPendingTask());
timer()->SetActive(false);
task_runner()->RunUntilIdle();
EXPECT_FALSE(client()->TickCalled());
}
TEST_F(DelayBasedTimeSourceTest, StartTwiceEnqueuesOneTask) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
EXPECT_TRUE(task_runner()->HasPendingTask());
task_runner()->ClearPendingTasks();
timer()->SetActive(true);
EXPECT_FALSE(task_runner()->HasPendingTask());
}
TEST_F(DelayBasedTimeSourceTest, StartWhenRunningDoesntTick) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
EXPECT_TRUE(task_runner()->HasPendingTask());
task_runner()->RunUntilIdle();
task_runner()->ClearPendingTasks();
timer()->SetActive(true);
EXPECT_FALSE(task_runner()->HasPendingTask());
}
// At 60Hz, when the tick returns at exactly the requested next time, make sure
// a 16ms next delay is posted.
TEST_F(DelayBasedTimeSourceTest, NextDelaySaneWhenExactlyOnRequestedTime) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
// Run the first tick.
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
task_runner()->AdvanceMockTickClock(Interval());
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
}
// At 60Hz, when the tick returns at slightly after the requested next time,
// make sure a 16ms next delay is posted.
TEST_F(DelayBasedTimeSourceTest, NextDelaySaneWhenSlightlyAfterRequestedTime) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
// Run the first tick.
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
task_runner()->AdvanceMockTickClock(Interval() + base::Microseconds(1));
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
}
// At 60Hz, when the tick returns at exactly 2*interval after the requested next
// time, make sure we don't tick unnecessarily.
TEST_F(DelayBasedTimeSourceTest,
NextDelaySaneWhenExactlyTwiceAfterRequestedTime) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
// Run the first tick.
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
task_runner()->AdvanceMockTickClock(2 * Interval());
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
}
// At 60Hz, when the tick returns at 2*interval and a bit after the requested
// next time, make sure a 16ms next delay is posted.
TEST_F(DelayBasedTimeSourceTest,
NextDelaySaneWhenSlightlyAfterTwiceRequestedTime) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
// Run the first tick.
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
task_runner()->AdvanceMockTickClock(2 * Interval() + base::Microseconds(1));
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
}
// At 60Hz, when the tick returns halfway to the next frame time, make sure
// a correct next delay value is posted.
TEST_F(DelayBasedTimeSourceTest, NextDelaySaneWhenHalfAfterRequestedTime) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
// Run the first tick.
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
task_runner()->AdvanceMockTickClock(Interval() + base::Milliseconds(8));
task_runner()->RunUntilIdle();
EXPECT_EQ(8, task_runner()->NextPendingTaskDelay().InMilliseconds());
}
TEST_F(DelayBasedTimeSourceTest, JitteryRuntimeWithFutureTimebases) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
// Run the first tick.
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
base::TimeTicks future_timebase = timer()->Now() + Interval() * 10;
// 1ms jitter
base::TimeDelta jitter1 = base::Milliseconds(1);
// Tick with +1ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() + jitter1);
task_runner()->RunUntilIdle();
EXPECT_EQ(15, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with 0ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() - jitter1);
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with -1ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() - jitter1);
task_runner()->RunUntilIdle();
EXPECT_EQ(1, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with 0ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() + jitter1);
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
// 8 ms jitter
base::TimeDelta jitter8 = base::Milliseconds(8);
// Tick with +8ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() + jitter8);
task_runner()->RunUntilIdle();
EXPECT_EQ(8, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with 0ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() - jitter8);
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with -8ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() - jitter8);
task_runner()->RunUntilIdle();
EXPECT_EQ(8, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with 0ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() + jitter8);
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
// 15 ms jitter
base::TimeDelta jitter15 = base::Milliseconds(15);
// Tick with +15ms jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() + jitter15);
task_runner()->RunUntilIdle();
EXPECT_EQ(1, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with 0ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() - jitter15);
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with -15ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() - jitter15);
task_runner()->RunUntilIdle();
EXPECT_EQ(15, task_runner()->NextPendingTaskDelay().InMilliseconds());
// Tick with 0ms of jitter
future_timebase += Interval();
timer()->SetTimebaseAndInterval(future_timebase, Interval());
task_runner()->AdvanceMockTickClock(Interval() + jitter15);
task_runner()->RunUntilIdle();
EXPECT_EQ(16, task_runner()->NextPendingTaskDelay().InMilliseconds());
}
TEST_F(DelayBasedTimeSourceTest, AchievesTargetRateWithNoNoise) {
int num_iterations = 10;
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true);
double total_frame_time = 0.0;
for (int i = 0; i < num_iterations; ++i) {
int64_t delay_ms = task_runner()->NextPendingTaskDelay().InMilliseconds();
// accumulate the "delay"
total_frame_time += delay_ms / 1000.0;
// Run the callback exactly when asked
task_runner()->AdvanceMockTickClock(base::Milliseconds(delay_ms));
task_runner()->RunUntilIdle();
}
double average_interval =
total_frame_time / static_cast<double>(num_iterations);
EXPECT_NEAR(1.0 / 60.0, average_interval, 0.1);
}
TEST_F(DelayBasedTimeSourceTest, TestDeactivateWhilePending) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
timer()->SetActive(true); // Should post a task.
timer()->SetActive(false);
// Should run the posted task without crashing.
EXPECT_FALSE(task_runner()->HasPendingTask());
task_runner()->RunUntilIdle();
}
TEST_F(DelayBasedTimeSourceTest,
TestDeactivateAndReactivateBeforeNextTickTime) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
// Should run the activate task, and pick up a new timebase.
timer()->SetActive(true);
task_runner()->RunUntilIdle();
// Stop the timer()
timer()->SetActive(false);
// Task will be pending anyway, run it
task_runner()->RunUntilIdle();
// Start the timer() again, but before the next tick time the timer()
// previously planned on using. That same tick time should still be targeted.
task_runner()->AdvanceMockTickClock(base::Milliseconds(4));
timer()->SetActive(true);
EXPECT_EQ(12, task_runner()->NextPendingTaskDelay().InMilliseconds());
}
TEST_F(DelayBasedTimeSourceTest, TestDeactivateAndReactivateAfterNextTickTime) {
timer()->SetTimebaseAndInterval(base::TimeTicks(), Interval());
// Should run the activate task, and pick up a new timebase.
timer()->SetActive(true);
task_runner()->RunUntilIdle();
// Stop the timer().
timer()->SetActive(false);
// Task will be pending anyway, run it.
task_runner()->RunUntilIdle();
// Start the timer() again, but before the next tick time the timer()
// previously planned on using. That same tick time should still be targeted.
task_runner()->AdvanceMockTickClock(base::Milliseconds(20));
timer()->SetActive(true);
EXPECT_EQ(13, task_runner()->NextPendingTaskDelay().InMilliseconds());
}
} // namespace
} // namespace viz
|
