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src/cc/CCDelayBasedTimeSourceTest.cpp

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// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "CCDelayBasedTimeSource.h"
#include "CCSchedulerTestCommon.h"
#include "CCThread.h"
#include <gtest/gtest.h>
#include <wtf/RefPtr.h>
using namespace WTF;
using namespace WebCore;
using namespace WebKitTests;
namespace {
TEST(CCDelayBasedTimeSourceTest, TaskPostedAndTickCalled)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(1.0 / 60.0, &thread);
timer->setClient(&client);
timer->setMonotonicTimeNow(0);
timer->setActive(true);
EXPECT_TRUE(timer->active());
EXPECT_TRUE(thread.hasPendingTask());
timer->setMonotonicTimeNow(0.016);
thread.runPendingTask();
EXPECT_TRUE(timer->active());
EXPECT_TRUE(client.tickCalled());
}
TEST(CCDelayBasedTimeSource, TickNotCalledWithTaskPosted)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(1.0 / 60.0, &thread);
timer->setClient(&client);
timer->setActive(true);
EXPECT_TRUE(thread.hasPendingTask());
timer->setActive(false);
thread.runPendingTask();
EXPECT_FALSE(client.tickCalled());
}
TEST(CCDelayBasedTimeSource, StartTwiceEnqueuesOneTask)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(1.0 / 60.0, &thread);
timer->setClient(&client);
timer->setActive(true);
EXPECT_TRUE(thread.hasPendingTask());
thread.reset();
timer->setActive(true);
EXPECT_FALSE(thread.hasPendingTask());
}
TEST(CCDelayBasedTimeSource, StartWhenRunningDoesntTick)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(1.0 / 60.0, &thread);
timer->setClient(&client);
timer->setActive(true);
thread.runPendingTask();
thread.reset();
timer->setActive(true);
EXPECT_FALSE(thread.hasPendingTask());
}
// At 60Hz, when the tick returns at exactly the requested next time, make sure
// a 16ms next delay is posted.
TEST(CCDelayBasedTimeSource, NextDelaySaneWhenExactlyOnRequestedTime)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
double interval = 1.0 / 60.0;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(interval, &thread);
timer->setClient(&client);
timer->setActive(true);
// Run the first task, as that activates the timer and picks up a timebase.
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
timer->setMonotonicTimeNow(interval);
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
}
// At 60Hz, when the tick returns at slightly after the requested next time, make sure
// a 16ms next delay is posted.
TEST(CCDelayBasedTimeSource, NextDelaySaneWhenSlightlyAfterRequestedTime)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
double interval = 1.0 / 60.0;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(interval, &thread);
timer->setClient(&client);
timer->setActive(true);
// Run the first task, as that activates the timer and picks up a timebase.
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
timer->setMonotonicTimeNow(interval + 0.0000001);
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
}
// At 60Hz, when the tick returns at exactly 2*interval after the requested next time, make sure
// a 16ms next delay is posted.
TEST(CCDelayBasedTimeSource, NextDelaySaneWhenExactlyTwiceAfterRequestedTime)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
double interval = 1.0 / 60.0;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(interval, &thread);
timer->setClient(&client);
timer->setActive(true);
// Run the first task, as that activates the timer and picks up a timebase.
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
timer->setMonotonicTimeNow(2*interval);
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
}
// 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(CCDelayBasedTimeSource, NextDelaySaneWhenSlightlyAfterTwiceRequestedTime)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
double interval = 1.0 / 60.0;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(interval, &thread);
timer->setClient(&client);
timer->setActive(true);
// Run the first task, as that activates the timer and picks up a timebase.
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
timer->setMonotonicTimeNow(2*interval + 0.0000001);
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
}
// At 60Hz, when the tick returns halfway to the next frame time, make sure
// a correct next delay value is posted.
TEST(CCDelayBasedTimeSource, NextDelaySaneWhenHalfAfterRequestedTime)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
double interval = 1.0 / 60.0;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(interval, &thread);
timer->setClient(&client);
timer->setActive(true);
// Run the first task, as that activates the timer and picks up a timebase.
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
timer->setMonotonicTimeNow(interval + interval * 0.5);
thread.runPendingTask();
EXPECT_EQ(8, thread.pendingDelayMs());
}
// If the timebase and interval are updated with a jittery source, we want to
// make sure we do not double tick.
TEST(CCDelayBasedTimeSource, SaneHandlingOfJitteryTimebase)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
double interval = 1.0 / 60.0;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(interval, &thread);
timer->setClient(&client);
timer->setActive(true);
// Run the first task, as that activates the timer and picks up a timebase.
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
// Jitter timebase ~1ms late
timer->setTimebaseAndInterval(interval + 0.001, interval);
timer->setMonotonicTimeNow(interval);
thread.runPendingTask();
// Without double tick prevention, pendingDelayMs would be 1.
EXPECT_EQ(17, thread.pendingDelayMs());
// Jitter timebase ~1ms early
timer->setTimebaseAndInterval(interval * 2 - 0.001, interval);
timer->setMonotonicTimeNow(interval * 2);
thread.runPendingTask();
EXPECT_EQ(15, thread.pendingDelayMs());
}
TEST(CCDelayBasedTimeSource, HanldlesSignificantTimebaseChangesImmediately)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
double interval = 1.0 / 60.0;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(interval, &thread);
timer->setClient(&client);
timer->setActive(true);
// Run the first task, as that activates the timer and picks up a timebase.
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
// Tick, then shift timebase by +7ms.
timer->setMonotonicTimeNow(interval);
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
client.reset();
thread.runPendingTaskOnOverwrite(true);
timer->setTimebaseAndInterval(interval + 0.0070001, interval);
thread.runPendingTaskOnOverwrite(false);
EXPECT_FALSE(client.tickCalled()); // Make sure pending tasks were canceled.
EXPECT_EQ(7, thread.pendingDelayMs());
// Tick, then shift timebase by -7ms.
timer->setMonotonicTimeNow(interval + 0.0070001);
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
client.reset();
thread.runPendingTaskOnOverwrite(true);
timer->setTimebaseAndInterval(interval, interval);
thread.runPendingTaskOnOverwrite(false);
EXPECT_FALSE(client.tickCalled()); // Make sure pending tasks were canceled.
EXPECT_EQ(16-7, thread.pendingDelayMs());
}
TEST(CCDelayBasedTimeSource, HanldlesSignificantIntervalChangesImmediately)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
double interval = 1.0 / 60.0;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(interval, &thread);
timer->setClient(&client);
timer->setActive(true);
// Run the first task, as that activates the timer and picks up a timebase.
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
// Tick, then double the interval.
timer->setMonotonicTimeNow(interval);
thread.runPendingTask();
EXPECT_EQ(16, thread.pendingDelayMs());
client.reset();
thread.runPendingTaskOnOverwrite(true);
timer->setTimebaseAndInterval(interval, interval * 2);
thread.runPendingTaskOnOverwrite(false);
EXPECT_FALSE(client.tickCalled()); // Make sure pending tasks were canceled.
EXPECT_EQ(33, thread.pendingDelayMs());
// Tick, then halve the interval.
timer->setMonotonicTimeNow(interval * 3);
thread.runPendingTask();
EXPECT_EQ(33, thread.pendingDelayMs());
client.reset();
thread.runPendingTaskOnOverwrite(true);
timer->setTimebaseAndInterval(interval * 3, interval);
thread.runPendingTaskOnOverwrite(false);
EXPECT_FALSE(client.tickCalled()); // Make sure pending tasks were canceled.
EXPECT_EQ(16, thread.pendingDelayMs());
}
TEST(CCDelayBasedTimeSourceTest, AchievesTargetRateWithNoNoise)
{
int numIterations = 1000;
FakeCCThread thread;
FakeCCTimeSourceClient client;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(1.0 / 60.0, &thread);
timer->setClient(&client);
timer->setActive(true);
double totalFrameTime = 0;
for (int i = 0; i < numIterations; ++i) {
long long delayMs = thread.pendingDelayMs();
// accumulate the "delay"
totalFrameTime += delayMs / 1000.0;
// Run the callback exactly when asked
double now = timer->monotonicTimeNow() + delayMs / 1000.0;
timer->setMonotonicTimeNow(now);
thread.runPendingTask();
}
double averageInterval = totalFrameTime / static_cast<double>(numIterations);
EXPECT_NEAR(1.0 / 60.0, averageInterval, 0.1);
}
TEST(CCDelayBasedTimeSource, TestDeactivateWhilePending)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(1.0 / 60.0, &thread);
timer->setClient(&client);
timer->setActive(true); // Should post a task.
timer->setActive(false);
timer.clear();
thread.runPendingTask(); // Should run the posted task without crashing.
}
TEST(CCDelayBasedTimeSource, TestDeactivateAndReactivateBeforeNextTickTime)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(1.0 / 60.0, &thread);
timer->setClient(&client);
// Should run the activate task, and pick up a new timebase.
timer->setActive(true);
timer->setMonotonicTimeNow(0);
thread.runPendingTask();
// Stop the timer
timer->setActive(false);
// Task will be pending anyway, run it
thread.runPendingTask();
// Start the timer again, but before the next tick time the timer previously
// planned on using. That same tick time should still be targeted.
timer->setMonotonicTimeNow(0.004);
timer->setActive(true);
EXPECT_EQ(12, thread.pendingDelayMs());
}
TEST(CCDelayBasedTimeSource, TestDeactivateAndReactivateAfterNextTickTime)
{
FakeCCThread thread;
FakeCCTimeSourceClient client;
RefPtr<FakeCCDelayBasedTimeSource> timer = FakeCCDelayBasedTimeSource::create(1.0 / 60.0, &thread);
timer->setClient(&client);
// Should run the activate task, and pick up a new timebase.
timer->setActive(true);
timer->setMonotonicTimeNow(0);
thread.runPendingTask();
// Stop the timer
timer->setActive(false);
// Task will be pending anyway, run it
thread.runPendingTask();
// Start the timer again, but before the next tick time the timer previously
// planned on using. That same tick time should still be targeted.
timer->setMonotonicTimeNow(0.02);
timer->setActive(true);
EXPECT_EQ(13, thread.pendingDelayMs());
}
}