CCDelayBasedTimeSourceTest.cpp   [plain text]

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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#include "config.h"

#include "cc/CCDelayBasedTimeSource.h"

#include "CCSchedulerTestCommon.h"
#include "cc/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->setMonotonicallyIncreasingTime(0);
    timer->setActive(true);
    EXPECT_TRUE(timer->active());
    EXPECT_TRUE(thread.hasPendingTask());

    timer->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(interval + interval * 0.5);
    thread.runPendingTask();

    EXPECT_EQ(8, 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->monotonicallyIncreasingTime() + delayMs / 1000.0;
        timer->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(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->setMonotonicallyIncreasingTime(0.02);
    timer->setActive(true);
    EXPECT_EQ(13, thread.pendingDelayMs());
}

}