cc/metrics/frame_sequence_tracker_unittest.cc

// Copyright 2019 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/metrics/frame_sequence_tracker.h"

#include "base/macros.h"
#include "cc/metrics/compositor_frame_reporting_controller.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {
namespace {

class FrameSequenceTrackerTest;

class FrameSequenceTrackerTest : public testing::Test {
 public:
  const uint32_t kImplDamage = 0x1;
  const uint32_t kMainDamage = 0x2;

  FrameSequenceTrackerTest()
      : compositor_frame_reporting_controller_(
            std::make_unique<CompositorFrameReportingController>()),
        collection_(compositor_frame_reporting_controller_.get()),
        tracker_(
            collection_.CreateTracker(FrameSequenceTrackerType::kTouchScroll)) {
  }
  ~FrameSequenceTrackerTest() override = default;

  std::unique_ptr<FrameSequenceTracker> CreateNewTracker() {
    return collection_.CreateTracker(FrameSequenceTrackerType::kTouchScroll);
  }

  viz::BeginFrameArgs CreateBeginFrameArgs(uint64_t source_id,
                                           uint64_t sequence_number) {
    auto now = base::TimeTicks::Now();
    auto interval = base::TimeDelta::FromMilliseconds(16);
    auto deadline = now + interval;
    return viz::BeginFrameArgs::Create(BEGINFRAME_FROM_HERE, source_id,
                                       sequence_number, now, deadline, interval,
                                       viz::BeginFrameArgs::NORMAL);
  }

  void StartImplAndMainFrames(const viz::BeginFrameArgs& args) {
    collection_.NotifyBeginImplFrame(args);
    collection_.NotifyBeginMainFrame(args);
  }

  uint32_t DispatchCompleteFrame(const viz::BeginFrameArgs& args,
                                 uint32_t damage_type) {
    StartImplAndMainFrames(args);

    if (damage_type & kImplDamage) {
      if (!(damage_type & kMainDamage)) {
        collection_.NotifyMainFrameCausedNoDamage(args);
      }
      uint32_t frame_token = NextFrameToken();
      collection_.NotifySubmitFrame(frame_token, viz::BeginFrameAck(args, true),
                                    args);
      return frame_token;
    } else {
      collection_.NotifyImplFrameCausedNoDamage(
          viz::BeginFrameAck(args, false));
      collection_.NotifyMainFrameCausedNoDamage(args);
    }
    return 0;
  }

  uint32_t NextFrameToken() {
    static uint32_t frame_token = 0;
    return ++frame_token;
  }

 protected:
  std::unique_ptr<CompositorFrameReportingController>
      compositor_frame_reporting_controller_;
  FrameSequenceTrackerCollection collection_;
  std::unique_ptr<FrameSequenceTracker> tracker_;
};

// Tests that the tracker works correctly when the source-id for the
// begin-frames change.
TEST_F(FrameSequenceTrackerTest, SourceIdChangeDuringSequence) {
  const uint64_t source_1 = 1;
  uint64_t sequence_1 = 0;

  // Dispatch some frames, both causing damage to impl/main, and both impl and
  // main providing damage to the frame.
  auto args_1 = CreateBeginFrameArgs(source_1, ++sequence_1);
  DispatchCompleteFrame(args_1, kImplDamage | kMainDamage);
  args_1 = CreateBeginFrameArgs(source_1, ++sequence_1);
  DispatchCompleteFrame(args_1, kImplDamage | kMainDamage);

  // Start a new tracker.
  auto tracker = CreateNewTracker();

  // Change the source-id, and start an impl frame. This time, the main-frame
  // does not provide any damage.
  const uint64_t source_2 = 2;
  uint64_t sequence_2 = 0;
  auto args_2 = CreateBeginFrameArgs(source_2, ++sequence_2);
  collection_.NotifyBeginImplFrame(args_2);
  collection_.NotifyBeginMainFrame(args_2);
  collection_.NotifyMainFrameCausedNoDamage(args_2);
  // Since the main-frame did not have any new damage from the latest
  // BeginFrameArgs, the submit-frame will carry the previous BeginFrameArgs
  // (from source_1);
  collection_.NotifySubmitFrame(NextFrameToken(),
                                viz::BeginFrameAck(args_2, true), args_1);
}

}  // namespace
}  // namespace cc