Initial checkin of the new Mozart compositor.

services/gfx/compositor/backend/vsync_scheduler_unittest.cc

Index: services/gfx/compositor/backend/vsync_scheduler_unittest.cc
diff --git a/services/gfx/compositor/backend/vsync_scheduler_unittest.cc b/services/gfx/compositor/backend/vsync_scheduler_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..654eed169decf3695dd92edae743982b16d25965
--- /dev/null
+++ b/services/gfx/compositor/backend/vsync_scheduler_unittest.cc
@@ -0,0 +1,367 @@
+// Copyright 2015 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 "services/gfx/compositor/backend/vsync_scheduler.h"
+
+#include <queue>
+
+#include "base/bind.h"
+#include "base/test/test_mock_time_task_runner.h"
+#include "base/time/tick_clock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace compositor {
+
+namespace {
+constexpr int64_t kVsyncTimebase = -5000;
+constexpr int64_t kVsyncInterval = 10000;
+constexpr int64_t kUpdatePhase = -9000;
+constexpr int64_t kSnapshotPhase = -1000;
+constexpr int64_t kPresentationPhase = 2000;
+}  // namespace
+
+class VsyncSchedulerTest : public testing::Test {
+ protected:
+  void SetUp() override { Reset(); }
+
+  void TearDown() override {
+    task_runner_->FastForwardUntilNoTasksRemain();
+    EXPECT_TRUE(expected_callbacks_.empty());
+  }
+
+  void ExpectUpdateCallback(int64_t frame_time,
+                            uint64_t frame_interval,
+                            int64_t frame_deadline,
+                            int64_t presentation_time) {
+    expected_callbacks_.emplace(CallbackType::kUpdate, frame_time, frame_time,
+                                frame_interval, frame_deadline,
+                                presentation_time);
+  }
+
+  void ExpectSnapshotCallback(int64_t frame_time,
+                              uint64_t frame_interval,
+                              int64_t frame_deadline,
+                              int64_t presentation_time) {
+    expected_callbacks_.emplace(CallbackType::kSnapshot, frame_deadline,
+                                frame_time, frame_interval, frame_deadline,
+                                presentation_time);
+  }
+
+  MojoTimeTicks GetTimeTicksNow() {
+    return task_runner_->NowTicks().ToInternalValue();
+  }
+
+  void Reset() {
+    task_runner_ = new base::TestMockTimeTaskRunner();
+    SchedulerCallbacks callbacks(
+        base::Bind(&VsyncSchedulerTest::OnUpdate, base::Unretained(this)),
+        base::Bind(&VsyncSchedulerTest::OnSnapshot, base::Unretained(this)));
+    scheduler_.reset(
+        new VsyncScheduler(task_runner_, callbacks,
+                           base::Bind(&VsyncSchedulerTest::GetTimeTicksNow,
+                                      base::Unretained(this))));
+
+    std::queue<ExpectedCallback> victim;
+    expected_callbacks_.swap(victim);
+  }
+
+  void FastForwardTo(int64_t time) {
+    DCHECK(time >= GetTimeTicksNow());
+    task_runner_->FastForwardBy(
+        base::TimeDelta::FromMicroseconds(time - GetTimeTicksNow()));
+  }
+
+  std::unique_ptr<VsyncScheduler> scheduler_;
+
+ private:
+  enum class CallbackType {
+    kUpdate,
+    kSnapshot,
+  };
+
+  struct ExpectedCallback {
+    ExpectedCallback(CallbackType type,
+                     int64_t delivery_time,
+                     int64_t frame_time,
+                     uint64_t frame_interval,
+                     int64_t frame_deadline,
+                     int64_t presentation_time)
+        : type(type),
+          delivery_time(delivery_time),
+          frame_time(frame_time),
+          frame_interval(frame_interval),
+          frame_deadline(frame_deadline),
+          presentation_time(presentation_time) {}
+
+    CallbackType type;
+    int64_t delivery_time;
+    int64_t frame_time;
+    uint64_t frame_interval;
+    int64_t frame_deadline;
+    int64_t presentation_time;
+  };
+
+  void OnUpdate(const mojo::gfx::composition::FrameInfo& frame_info) {
+    VerifyCallback(CallbackType::kUpdate, frame_info);
+  }
+
+  void OnSnapshot(const mojo::gfx::composition::FrameInfo& frame_info) {
+    VerifyCallback(CallbackType::kSnapshot, frame_info);
+  }
+
+  void VerifyCallback(CallbackType type,
+                      const mojo::gfx::composition::FrameInfo& frame_info) {
+    EXPECT_FALSE(expected_callbacks_.empty());
+    if (!expected_callbacks_.empty()) {
+      const ExpectedCallback& c = expected_callbacks_.front();
+      EXPECT_EQ(static_cast<int>(c.type), static_cast<int>(type));
+      EXPECT_EQ(c.delivery_time, GetTimeTicksNow());
+      EXPECT_EQ(c.frame_time, frame_info.frame_time);
+      EXPECT_EQ(c.frame_interval, frame_info.frame_interval);
+      EXPECT_EQ(c.frame_deadline, frame_info.frame_deadline);
+      EXPECT_EQ(c.presentation_time, frame_info.presentation_time);
+      expected_callbacks_.pop();
+    }
+  }
+
+  scoped_refptr<base::TestMockTimeTaskRunner> task_runner_;
+  std::queue<ExpectedCallback> expected_callbacks_;
+};
+
+TEST_F(VsyncSchedulerTest, StartValidatesArguments) {
+  // Vsync timebase is in the past.
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+  Reset();
+
+  // Vsync timebase is now.  (current time == 0)
+  EXPECT_TRUE(scheduler_->Start(0, kVsyncInterval, kUpdatePhase, kSnapshotPhase,
+                                kPresentationPhase));
+  Reset();
+
+  // Vsync timebase in the future.  (current time == 0)
+  EXPECT_FALSE(scheduler_->Start(1, kVsyncInterval, kUpdatePhase,
+                                 kSnapshotPhase, kPresentationPhase));
+
+  // Vsync interval too small.
+  EXPECT_FALSE(
+      scheduler_->Start(0, VsyncScheduler::kMinVsyncInterval - 1, 0, 0, 0));
+
+  // Vsync interval at minimum.
+  EXPECT_TRUE(scheduler_->Start(0, VsyncScheduler::kMinVsyncInterval, 0, 0, 0));
+  Reset();
+
+  // Vsync interval at maximum.
+  EXPECT_TRUE(scheduler_->Start(0, VsyncScheduler::kMaxVsyncInterval, 0, 0, 0));
+  Reset();
+
+  // Vsync interval too large.
+  EXPECT_FALSE(
+      scheduler_->Start(0, VsyncScheduler::kMaxVsyncInterval + 1, 0, 0, 0));
+
+  // Snapshot phase earlier than update phase.
+  EXPECT_FALSE(scheduler_->Start(0, kVsyncInterval, kUpdatePhase,
+                                 kUpdatePhase - 1, kPresentationPhase));
+
+  // Snapshot phase more than one frame behind update phase.
+  EXPECT_FALSE(scheduler_->Start(0, kVsyncInterval, kUpdatePhase,
+                                 kUpdatePhase + kVsyncInterval + 1,
+                                 kPresentationPhase));
+
+  // Presentation phase earlier than snapshot phase.
+  EXPECT_FALSE(scheduler_->Start(0, kVsyncInterval, kUpdatePhase,
+                                 kSnapshotPhase, kSnapshotPhase - 1));
+
+  // Minimum and maximum update vs. snapshot phase delta.
+  EXPECT_TRUE(scheduler_->Start(0, kVsyncInterval, kUpdatePhase, kUpdatePhase,
+                                kUpdatePhase));
+  Reset();
+  EXPECT_TRUE(scheduler_->Start(0, kVsyncInterval, kUpdatePhase,
+                                kUpdatePhase + kVsyncInterval,
+                                kUpdatePhase + kVsyncInterval));
+  Reset();
+}
+
+TEST_F(VsyncSchedulerTest, ScheduleRedundantSnapshot) {
+  // Start immediately schedules work.
+  ExpectSnapshotCallback(-4000, kVsyncInterval, 4000, 7000);
+  ExpectUpdateCallback(6000, kVsyncInterval, 14000, 17000);
+  ExpectSnapshotCallback(6000, kVsyncInterval, 14000, 17000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // Shortly after the first update, schedule another snapshot.
+  // Nothing happens because a snapshot is still due at 14000.
+  FastForwardTo(8000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kSnapshot);
+}
+
+TEST_F(VsyncSchedulerTest, ScheduleRedundantUpdate) {
+  // Start immediately schedules work.
+  ExpectSnapshotCallback(-4000, kVsyncInterval, 4000, 7000);
+  ExpectUpdateCallback(6000, kVsyncInterval, 14000, 17000);
+  ExpectSnapshotCallback(6000, kVsyncInterval, 14000, 17000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // Before the first update, schedule another update.
+  // Nothing happens because an update is still due at 6000.
+  FastForwardTo(5000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+}
+
+TEST_F(VsyncSchedulerTest, ScheduleRequiredSnapshot) {
+  // Start immediately schedules work.
+  ExpectSnapshotCallback(-4000, kVsyncInterval, 4000, 7000);
+  ExpectUpdateCallback(6000, kVsyncInterval, 14000, 17000);
+  ExpectSnapshotCallback(6000, kVsyncInterval, 14000, 17000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // Shortly after the last snapshot, schedule another snapshot.
+  FastForwardTo(15000);
+  ExpectUpdateCallback(16000, kVsyncInterval, 24000, 27000);
+  ExpectSnapshotCallback(16000, kVsyncInterval, 24000, 27000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kSnapshot);
+
+  // Exactly at the moment of the next snapshot, schedule another snapshot.
+  FastForwardTo(24000);
+  ExpectUpdateCallback(26000, kVsyncInterval, 34000, 37000);
+  ExpectSnapshotCallback(26000, kVsyncInterval, 34000, 37000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kSnapshot);
+
+  // A long time thereafter, with no time to update, schedule another snapshot.
+  FastForwardTo(53000);
+  ExpectSnapshotCallback(46000, kVsyncInterval, 54000, 57000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kSnapshot);
+
+  // A long time thereafter, with time to update, schedule another snapshot.
+  FastForwardTo(75000);
+  ExpectUpdateCallback(76000, kVsyncInterval, 84000, 87000);
+  ExpectSnapshotCallback(76000, kVsyncInterval, 84000, 87000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kSnapshot);
+}
+
+TEST_F(VsyncSchedulerTest, ScheduleRequiredUpdate) {
+  // Start immediately schedules work.
+  ExpectSnapshotCallback(-4000, kVsyncInterval, 4000, 7000);
+  ExpectUpdateCallback(6000, kVsyncInterval, 14000, 17000);
+  ExpectSnapshotCallback(6000, kVsyncInterval, 14000, 17000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // Shortly after the first update, schedule another update.
+  FastForwardTo(8000);
+  ExpectUpdateCallback(16000, kVsyncInterval, 24000, 27000);
+  ExpectSnapshotCallback(16000, kVsyncInterval, 24000, 27000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+
+  // Exactly at the moment of the next update, schedule another update.
+  FastForwardTo(16000);
+  ExpectUpdateCallback(26000, kVsyncInterval, 34000, 37000);
+  ExpectSnapshotCallback(26000, kVsyncInterval, 34000, 37000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+
+  // A long time thereafter, with no time to snapshot, schedule another update.
+  FastForwardTo(55000);
+  ExpectUpdateCallback(56000, kVsyncInterval, 64000, 67000);
+  ExpectSnapshotCallback(56000, kVsyncInterval, 64000, 67000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+
+  // A long time thereafter, with time to snapshot, schedule another update.
+  FastForwardTo(83000);
+  ExpectSnapshotCallback(76000, kVsyncInterval, 84000, 87000);
+  ExpectUpdateCallback(86000, kVsyncInterval, 94000, 97000);
+  ExpectSnapshotCallback(86000, kVsyncInterval, 94000, 97000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+}
+
+TEST_F(VsyncSchedulerTest, StartAndStop) {
+  // Scheduling frames before start does nothing.
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+
+  // Starting the scheduler automatically schedules an update.
+  FastForwardTo(15000);
+  ExpectUpdateCallback(16000, kVsyncInterval, 24000, 27000);
+  ExpectSnapshotCallback(16000, kVsyncInterval, 24000, 27000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // Stopping the scheduler suspends further updates.
+  FastForwardTo(24000);
+  scheduler_->Stop();
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+
+  // Restarting scheduling resumes updates.
+  FastForwardTo(53000);
+  ExpectSnapshotCallback(46000, kVsyncInterval, 54000, 57000);
+  ExpectUpdateCallback(56000, kVsyncInterval, 64000, 67000);
+  ExpectSnapshotCallback(56000, kVsyncInterval, 64000, 67000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // Stopping the scheduler cancels undelivered updates.
+  FastForwardTo(63000);
+  // canceled: ExpectUpdateCallback(66000, kVsyncInterval, 74000, 77000);
+  // canceled: ExpectSnapshotCallback(66000, kVsyncInterval, 74000, 77000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+  FastForwardTo(65000);
+  scheduler_->Stop();
+}
+
+TEST_F(VsyncSchedulerTest, RedundantStart) {
+  // Start immediately schedules work.
+  ExpectSnapshotCallback(-4000, kVsyncInterval, 4000, 7000);
+  ExpectUpdateCallback(6000, kVsyncInterval, 14000, 17000);
+  ExpectSnapshotCallback(6000, kVsyncInterval, 14000, 17000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // Doing it again has no added effect.
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // A long time thereafter, schedule another update.
+  FastForwardTo(55000);
+  ExpectUpdateCallback(56000, kVsyncInterval, 64000, 67000);
+  ExpectSnapshotCallback(56000, kVsyncInterval, 64000, 67000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+}
+
+TEST_F(VsyncSchedulerTest, StartWithNewParameters) {
+  // Start immediately schedules work.
+  ExpectSnapshotCallback(-4000, kVsyncInterval, 4000, 7000);
+  ExpectUpdateCallback(6000, kVsyncInterval, 14000, 17000);
+  ExpectSnapshotCallback(6000, kVsyncInterval, 14000, 17000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+
+  // After the snapshot is delivered, change parameters.
+  FastForwardTo(14000);
+  ExpectUpdateCallback(17000, kVsyncInterval * 2, 33000, 39000);
+  ExpectSnapshotCallback(17000, kVsyncInterval * 2, 33000, 39000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval * 2,
+                                kUpdatePhase * 2, kSnapshotPhase * 2,
+                                kPresentationPhase * 2));
+
+  // Schedule another update with these parameters.
+  FastForwardTo(18000);
+  ExpectUpdateCallback(37000, kVsyncInterval * 2, 53000, 59000);
+  // canceled: ExpectSnapshotCallback(37000, kVsyncInterval * 2, 53000, 59000);
+  scheduler_->ScheduleFrame(Scheduler::SchedulingMode::kUpdateAndSnapshot);
+
+  // At the moment when the update is delivered, change parameters again.
+  // We're too late to cancel the prior update but we do cancel the prior
+  // snapshot and we'll follow it up with another update with the new
+  // parameters.
+  FastForwardTo(37000);
+  ExpectUpdateCallback(46000, kVsyncInterval, 54000, 57000);
+  ExpectSnapshotCallback(46000, kVsyncInterval, 54000, 57000);
+  EXPECT_TRUE(scheduler_->Start(kVsyncTimebase, kVsyncInterval, kUpdatePhase,
+                                kSnapshotPhase, kPresentationPhase));
+}
+
+// TODO(jeffbrown): Add tests for cases where the compositor has fallen behind.
+
+}  // namespace compositor