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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/compositor/host_begin_frame_observer.h"
#include <optional>
#include <utility>
#include "base/location.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/task_environment.h"
#include "base/time/time.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
#include "components/viz/test/begin_frame_args_test.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using testing::_;
namespace ui {
namespace {
constexpr base::TimeDelta kVsyncInterval = base::Milliseconds(16);
class MockSimpleBeginFrameObserver
: public HostBeginFrameObserver::SimpleBeginFrameObserver {
public:
MOCK_METHOD(void,
OnBeginFrame,
(base::TimeTicks,
base::TimeDelta,
std::optional<base::TimeTicks>),
(override));
MOCK_METHOD(void, OnBeginFrameSourceShuttingDown, (), (override));
};
viz::BeginFrameArgs CreateBeginFrameArgs(base::TimeTicks frame_time) {
return viz::BeginFrameArgs::Create(
BEGINFRAME_FROM_HERE, 0, viz::BeginFrameArgs::kStartingFrameNumber,
frame_time, base::TimeTicks::Max(), kVsyncInterval,
viz::BeginFrameArgs::BeginFrameArgsType::NORMAL);
}
// Test fixture for LayerOwner tests that require a ui::Compositor.
class HostBeginFrameObserverTest : public testing::Test {
public:
HostBeginFrameObserverTest() = default;
HostBeginFrameObserverTest(const HostBeginFrameObserverTest&) = delete;
HostBeginFrameObserverTest& operator=(const HostBeginFrameObserverTest&) =
delete;
~HostBeginFrameObserverTest() override = default;
void SetUp() override;
void TearDown() override;
protected:
MockSimpleBeginFrameObserver mock_observer_;
base::test::SingleThreadTaskEnvironment task_environment_{
base::test::TaskEnvironment::TimeSource::MOCK_TIME};
ui::HostBeginFrameObserver::SimpleBeginFrameObserverList observer_list_;
HostBeginFrameObserver host_observer_{
observer_list_, base::SingleThreadTaskRunner::GetCurrentDefault()};
};
void HostBeginFrameObserverTest::SetUp() {
observer_list_.AddObserver(&mock_observer_);
}
void HostBeginFrameObserverTest::TearDown() {
observer_list_.RemoveObserver(&mock_observer_);
}
} // namespace
TEST_F(HostBeginFrameObserverTest, MissedFrame) {
base::TimeTicks frame_time = base::TimeTicks::Now() - base::Milliseconds(15);
viz::BeginFrameArgs args = CreateBeginFrameArgs(frame_time);
args.type = viz::BeginFrameArgs::MISSED;
EXPECT_CALL(mock_observer_, OnBeginFrame(_, _, _)).Times(0);
host_observer_.OnStandaloneBeginFrame(args);
}
TEST_F(HostBeginFrameObserverTest, FrameYougerThanVsyncInterval) {
{
base::TimeTicks frame_time1 =
base::TimeTicks::Now() - base::Milliseconds(15);
viz::BeginFrameArgs args1 = CreateBeginFrameArgs(frame_time1);
EXPECT_CALL(mock_observer_, OnBeginFrame(frame_time1, kVsyncInterval,
std::optional<base::TimeTicks>{}))
.Times(1);
host_observer_.OnStandaloneBeginFrame(args1);
}
// Check that the behavior repeats.
{
task_environment_.FastForwardBy(base::Milliseconds(100));
base::TimeTicks frame_time2 =
base::TimeTicks::Now() - base::Milliseconds(15);
viz::BeginFrameArgs args2 = CreateBeginFrameArgs(frame_time2);
EXPECT_CALL(mock_observer_, OnBeginFrame(frame_time2, kVsyncInterval,
std::optional<base::TimeTicks>{}))
.Times(1);
host_observer_.OnStandaloneBeginFrame(args2);
}
}
TEST_F(HostBeginFrameObserverTest, FrameOlderThanVsyncInterval) {
{
base::TimeTicks frame_time1 =
base::TimeTicks::Now() - base::Milliseconds(17);
viz::BeginFrameArgs args1 = CreateBeginFrameArgs(frame_time1);
EXPECT_CALL(mock_observer_, OnBeginFrame(_, _, _)).Times(0);
host_observer_.OnStandaloneBeginFrame(args1);
EXPECT_CALL(mock_observer_, OnBeginFrame(frame_time1, kVsyncInterval,
std::optional<base::TimeTicks>{}))
.Times(1);
task_environment_.FastForwardBy(base::Milliseconds(100));
}
// Check that things go back to normal afterwards.
{
base::TimeTicks frame_time2 =
base::TimeTicks::Now() - base::Milliseconds(15);
viz::BeginFrameArgs args2 = CreateBeginFrameArgs(frame_time2);
EXPECT_CALL(mock_observer_, OnBeginFrame(frame_time2, kVsyncInterval,
std::optional<base::TimeTicks>{}))
.Times(1);
host_observer_.OnStandaloneBeginFrame(args2);
}
}
TEST_F(HostBeginFrameObserverTest,
FrameOlderThanVsyncIntervalFollowedByMoreFrames) {
{
base::TimeTicks frame_time1 =
base::TimeTicks::Now() - base::Milliseconds(17);
base::TimeTicks frame_time2 =
base::TimeTicks::Now() - base::Milliseconds(15);
base::TimeTicks frame_time3 =
base::TimeTicks::Now() - base::Milliseconds(13);
viz::BeginFrameArgs args1 = CreateBeginFrameArgs(frame_time1);
viz::BeginFrameArgs args2 = CreateBeginFrameArgs(frame_time2);
viz::BeginFrameArgs args3 = CreateBeginFrameArgs(frame_time3);
EXPECT_CALL(mock_observer_, OnBeginFrame(_, _, _)).Times(0);
host_observer_.OnStandaloneBeginFrame(args1);
host_observer_.OnStandaloneBeginFrame(args2);
host_observer_.OnStandaloneBeginFrame(args3);
EXPECT_CALL(mock_observer_,
OnBeginFrame(frame_time3, kVsyncInterval,
std::optional<base::TimeTicks>{frame_time1}))
.Times(1);
task_environment_.FastForwardBy(base::Milliseconds(100));
}
// Check that things go back to normal afterwards.
{
base::TimeTicks frame_time4 =
base::TimeTicks::Now() - base::Milliseconds(15);
viz::BeginFrameArgs args4 = CreateBeginFrameArgs(frame_time4);
EXPECT_CALL(mock_observer_, OnBeginFrame(frame_time4, kVsyncInterval,
std::optional<base::TimeTicks>{}))
.Times(1);
host_observer_.OnStandaloneBeginFrame(args4);
}
}
} // namespace ui
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