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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 "cc/frame_rate_controller.h"
#include "cc/test/scheduler_test_common.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cc {
namespace {
class FakeFrameRateControllerClient : public cc::FrameRateControllerClient {
public:
FakeFrameRateControllerClient() { reset(); }
void reset() { m_vsyncTicked = false; }
bool vsyncTicked() const { return m_vsyncTicked; }
virtual void vsyncTick(bool throttled) { m_vsyncTicked = !throttled; }
protected:
bool m_vsyncTicked;
};
TEST(FrameRateControllerTest, TestFrameThrottling_ImmediateAck)
{
FakeThread thread;
FakeFrameRateControllerClient client;
base::TimeDelta interval = base::TimeDelta::FromMicroseconds(base::Time::kMicrosecondsPerSecond / 60);
scoped_refptr<FakeDelayBasedTimeSource> timeSource = FakeDelayBasedTimeSource::create(interval, &thread);
FrameRateController controller(timeSource);
controller.setClient(&client);
controller.setActive(true);
base::TimeTicks elapsed; // Muck around with time a bit
// Trigger one frame, make sure the vsync callback is called
elapsed += base::TimeDelta::FromMilliseconds(thread.pendingDelayMs());
timeSource->setNow(elapsed);
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
client.reset();
// Tell the controller we drew
controller.didBeginFrame();
// Tell the controller the frame ended 5ms later
timeSource->setNow(timeSource->now() + base::TimeDelta::FromMilliseconds(5));
controller.didFinishFrame();
// Trigger another frame, make sure vsync runs again
elapsed += base::TimeDelta::FromMilliseconds(thread.pendingDelayMs());
EXPECT_TRUE(elapsed >= timeSource->now()); // Sanity check that previous code didn't move time backward.
timeSource->setNow(elapsed);
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
}
TEST(FrameRateControllerTest, TestFrameThrottling_TwoFramesInFlight)
{
FakeThread thread;
FakeFrameRateControllerClient client;
base::TimeDelta interval = base::TimeDelta::FromMicroseconds(base::Time::kMicrosecondsPerSecond / 60);
scoped_refptr<FakeDelayBasedTimeSource> timeSource = FakeDelayBasedTimeSource::create(interval, &thread);
FrameRateController controller(timeSource);
controller.setClient(&client);
controller.setActive(true);
controller.setMaxFramesPending(2);
base::TimeTicks elapsed; // Muck around with time a bit
// Trigger one frame, make sure the vsync callback is called
elapsed += base::TimeDelta::FromMilliseconds(thread.pendingDelayMs());
timeSource->setNow(elapsed);
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
client.reset();
// Tell the controller we drew
controller.didBeginFrame();
// Trigger another frame, make sure vsync callback runs again
elapsed += base::TimeDelta::FromMilliseconds(thread.pendingDelayMs());
EXPECT_TRUE(elapsed >= timeSource->now()); // Sanity check that previous code didn't move time backward.
timeSource->setNow(elapsed);
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
client.reset();
// Tell the controller we drew, again.
controller.didBeginFrame();
// Trigger another frame. Since two frames are pending, we should not draw.
elapsed += base::TimeDelta::FromMilliseconds(thread.pendingDelayMs());
EXPECT_TRUE(elapsed >= timeSource->now()); // Sanity check that previous code didn't move time backward.
timeSource->setNow(elapsed);
thread.runPendingTask();
EXPECT_FALSE(client.vsyncTicked());
// Tell the controller the first frame ended 5ms later
timeSource->setNow(timeSource->now() + base::TimeDelta::FromMilliseconds(5));
controller.didFinishFrame();
// Tick should not have been called
EXPECT_FALSE(client.vsyncTicked());
// Trigger yet another frame. Since one frames is pending, another vsync callback should run.
elapsed += base::TimeDelta::FromMilliseconds(thread.pendingDelayMs());
EXPECT_TRUE(elapsed >= timeSource->now()); // Sanity check that previous code didn't move time backward.
timeSource->setNow(elapsed);
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
}
TEST(FrameRateControllerTest, TestFrameThrottling_Unthrottled)
{
FakeThread thread;
FakeFrameRateControllerClient client;
FrameRateController controller(&thread);
controller.setClient(&client);
controller.setMaxFramesPending(2);
// setActive triggers 1st frame, make sure the vsync callback is called
controller.setActive(true);
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
client.reset();
// Even if we don't call didBeginFrame, FrameRateController should
// still attempt to vsync tick multiple times until it does result in
// a didBeginFrame.
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
client.reset();
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
client.reset();
// didBeginFrame triggers 2nd frame, make sure the vsync callback is called
controller.didBeginFrame();
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
client.reset();
// didBeginFrame triggers 3rd frame (> maxFramesPending), make sure the vsync callback is NOT called
controller.didBeginFrame();
thread.runPendingTask();
EXPECT_FALSE(client.vsyncTicked());
client.reset();
// Make sure there is no pending task since we can't do anything until we receive a didFinishFrame anyway.
EXPECT_FALSE(thread.hasPendingTask());
// didFinishFrame triggers a frame, make sure the vsync callback is called
controller.didFinishFrame();
thread.runPendingTask();
EXPECT_TRUE(client.vsyncTicked());
}
} // namespace
} // namespace cc
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