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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/scheduler/frame_rate_controller.h"
#include "base/test/test_simple_task_runner.h"
#include "cc/test/scheduler_test_common.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cc {
namespace {
class FakeFrameRateControllerClient : public FrameRateControllerClient {
public:
FakeFrameRateControllerClient() { Reset(); }
void Reset() { frame_count_ = 0; }
bool BeganFrame() const { return frame_count_ > 0; }
int frame_count() const { return frame_count_; }
virtual void FrameRateControllerTick(
bool throttled, const BeginFrameArgs& args) OVERRIDE {
frame_count_ += throttled ? 0 : 1;
}
protected:
int frame_count_;
};
TEST(FrameRateControllerTest, TestFrameThrottling_ImmediateAck) {
scoped_refptr<base::TestSimpleTaskRunner> task_runner =
new base::TestSimpleTaskRunner;
FakeFrameRateControllerClient client;
base::TimeDelta interval = base::TimeDelta::FromMicroseconds(
base::Time::kMicrosecondsPerSecond / 60);
scoped_refptr<FakeDelayBasedTimeSource> time_source =
FakeDelayBasedTimeSource::Create(interval, task_runner.get());
FrameRateController controller(time_source);
controller.SetClient(&client);
controller.SetActive(true);
base::TimeTicks elapsed; // Muck around with time a bit
// Trigger one frame, make sure the BeginFrame callback is called
elapsed += task_runner->NextPendingTaskDelay();
time_source->SetNow(elapsed);
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
client.Reset();
// Tell the controller we drew
controller.DidSwapBuffers();
// Tell the controller the frame ended 5ms later
time_source->SetNow(time_source->Now() +
base::TimeDelta::FromMilliseconds(5));
controller.DidSwapBuffersComplete();
// Trigger another frame, make sure BeginFrame runs again
elapsed += task_runner->NextPendingTaskDelay();
// Sanity check that previous code didn't move time backward.
EXPECT_GE(elapsed, time_source->Now());
time_source->SetNow(elapsed);
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
}
TEST(FrameRateControllerTest, TestFrameThrottling_TwoFramesInFlight) {
scoped_refptr<base::TestSimpleTaskRunner> task_runner =
new base::TestSimpleTaskRunner;
FakeFrameRateControllerClient client;
base::TimeDelta interval = base::TimeDelta::FromMicroseconds(
base::Time::kMicrosecondsPerSecond / 60);
scoped_refptr<FakeDelayBasedTimeSource> time_source =
FakeDelayBasedTimeSource::Create(interval, task_runner.get());
FrameRateController controller(time_source);
controller.SetClient(&client);
controller.SetActive(true);
controller.SetMaxSwapsPending(2);
base::TimeTicks elapsed; // Muck around with time a bit
// Trigger one frame, make sure the BeginFrame callback is called
elapsed += task_runner->NextPendingTaskDelay();
time_source->SetNow(elapsed);
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
client.Reset();
// Tell the controller we drew
controller.DidSwapBuffers();
// Trigger another frame, make sure BeginFrame callback runs again
elapsed += task_runner->NextPendingTaskDelay();
// Sanity check that previous code didn't move time backward.
EXPECT_GE(elapsed, time_source->Now());
time_source->SetNow(elapsed);
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
client.Reset();
// Tell the controller we drew, again.
controller.DidSwapBuffers();
// Trigger another frame. Since two frames are pending, we should not draw.
elapsed += task_runner->NextPendingTaskDelay();
// Sanity check that previous code didn't move time backward.
EXPECT_GE(elapsed, time_source->Now());
time_source->SetNow(elapsed);
task_runner->RunPendingTasks();
EXPECT_FALSE(client.BeganFrame());
// Tell the controller the first frame ended 5ms later
time_source->SetNow(time_source->Now() +
base::TimeDelta::FromMilliseconds(5));
controller.DidSwapBuffersComplete();
// Tick should not have been called
EXPECT_FALSE(client.BeganFrame());
// Trigger yet another frame. Since one frames is pending, another
// BeginFrame callback should run.
elapsed += task_runner->NextPendingTaskDelay();
// Sanity check that previous code didn't move time backward.
EXPECT_GE(elapsed, time_source->Now());
time_source->SetNow(elapsed);
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
}
TEST(FrameRateControllerTest, TestFrameThrottling_Unthrottled) {
scoped_refptr<base::TestSimpleTaskRunner> task_runner =
new base::TestSimpleTaskRunner;
FakeFrameRateControllerClient client;
FrameRateController controller(task_runner.get());
controller.SetClient(&client);
controller.SetMaxSwapsPending(2);
// SetActive triggers 1st frame, make sure the BeginFrame callback
// is called
controller.SetActive(true);
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
client.Reset();
// Even if we don't call DidSwapBuffers, FrameRateController should
// still attempt to tick multiple times until it does result in
// a DidSwapBuffers.
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
client.Reset();
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
client.Reset();
// DidSwapBuffers triggers 2nd frame, make sure the BeginFrame callback is
// called
controller.DidSwapBuffers();
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
client.Reset();
// DidSwapBuffers triggers 3rd frame (> max_frames_pending),
// make sure the BeginFrame callback is NOT called
controller.DidSwapBuffers();
task_runner->RunPendingTasks();
EXPECT_FALSE(client.BeganFrame());
client.Reset();
// Make sure there is no pending task since we can't do anything until we
// receive a DidSwapBuffersComplete anyway.
EXPECT_FALSE(task_runner->HasPendingTask());
// DidSwapBuffersComplete triggers a frame, make sure the BeginFrame
// callback is called
controller.DidSwapBuffersComplete();
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
}
TEST(FrameRateControllerTest, TestFrameThrottling_NoDoubleTicking) {
scoped_refptr<base::TestSimpleTaskRunner> task_runner =
new base::TestSimpleTaskRunner;
FakeFrameRateControllerClient client;
FrameRateController controller(task_runner.get());
controller.SetClient(&client);
// SetActive triggers 1st frame and queues another tick task since the time
// source isn't throttling.
controller.SetActive(true);
task_runner->RunPendingTasks();
EXPECT_TRUE(client.BeganFrame());
client.Reset();
EXPECT_TRUE(task_runner->HasPendingTask());
// Simulate a frame swap. This shouldn't queue a second tick task.
controller.DidSwapBuffers();
controller.DidSwapBuffersComplete();
// The client should only be ticked once.
task_runner->RunPendingTasks();
EXPECT_EQ(1, client.frame_count());
}
} // namespace
} // namespace cc
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