layer_unittest.cc

// Copyright (c) 2012 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 "ui/compositor/layer.h"

#include <stddef.h>

#include <memory>
#include <utility>
#include <vector>

#include "base/bind.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/json/json_reader.h"
#include "base/macros.h"
#include "base/path_service.h"
#include "base/run_loop.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/test/bind_test_util.h"
#include "base/test/task_environment.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "cc/animation/animation.h"
#include "cc/animation/animation_events.h"
#include "cc/animation/animation_host.h"
#include "cc/animation/keyframe_effect.h"
#include "cc/layers/layer.h"
#include "cc/layers/mirror_layer.h"
#include "cc/test/pixel_comparator.h"
#include "cc/test/pixel_test_utils.h"
#include "components/viz/common/frame_sinks/copy_output_request.h"
#include "components/viz/common/frame_sinks/copy_output_result.h"
#include "components/viz/common/resources/transferable_resource.h"
#include "components/viz/common/surfaces/parent_local_surface_id_allocator.h"
#include "components/viz/common/surfaces/surface_id.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "ui/compositor/compositor_observer.h"
#include "ui/compositor/dip_util.h"
#include "ui/compositor/layer_animation_element.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/compositor/layer_animation_sequence.h"
#include "ui/compositor/layer_animator.h"
#include "ui/compositor/paint_context.h"
#include "ui/compositor/paint_recorder.h"
#include "ui/compositor/scoped_animation_duration_scale_mode.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/compositor/test/draw_waiter_for_test.h"
#include "ui/compositor/test/layer_animator_test_controller.h"
#include "ui/compositor/test/test_compositor_host.h"
#include "ui/compositor/test/test_context_factories.h"
#include "ui/compositor/test/test_layers.h"
#include "ui/gfx/animation/tween.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/font_list.h"
#include "ui/gfx/interpolated_transform.h"
#include "ui/gfx/skia_util.h"

using cc::MatchesPNGFile;
using cc::WritePNGFile;

namespace ui {

namespace {

// There are three test classes in here that configure the Compositor and
// Layer's slightly differently:
// - LayerWithNullDelegateTest uses NullLayerDelegate as the LayerDelegate. This
//   is typically the base class you want to use.
// - LayerWithDelegateTest uses LayerDelegate on the delegates.
// - LayerWithRealCompositorTest when a real compositor is required for testing.
//    - Slow because they bring up a window and run the real compositor. This
//      is typically not what you want.

class ColoredLayer : public Layer, public LayerDelegate {
 public:
  explicit ColoredLayer(SkColor color)
      : Layer(LAYER_TEXTURED),
        color_(color) {
    set_delegate(this);
  }

  ~ColoredLayer() override {}

  // Overridden from LayerDelegate:
  void OnPaintLayer(const ui::PaintContext& context) override {
    ui::PaintRecorder recorder(context, size());
    recorder.canvas()->DrawColor(color_);
  }

  void OnDeviceScaleFactorChanged(float old_device_scale_factor,
                                  float new_device_scale_factor) override {}

 private:
  SkColor color_;
};

// Param specifies whether to use SkiaRenderer or not
class LayerWithRealCompositorTest : public testing::TestWithParam<bool> {
 public:
  LayerWithRealCompositorTest()
      : task_environment_(base::test::TaskEnvironment::MainThreadType::UI) {
    gfx::FontList::SetDefaultFontDescription("Segoe UI, 15px");
  }
  ~LayerWithRealCompositorTest() override {}

  // Overridden from testing::Test:
  void SetUp() override {
    ASSERT_TRUE(base::PathService::Get(base::DIR_SOURCE_ROOT, &test_data_dir_));
    test_data_dir_ = test_data_dir_.Append(FILE_PATH_LITERAL("ui"))
                         .Append(FILE_PATH_LITERAL("gfx"))
                         .Append(FILE_PATH_LITERAL("test"))
                         .Append(FILE_PATH_LITERAL("data"))
                         .Append(FILE_PATH_LITERAL("compositor"));
    ASSERT_TRUE(base::PathExists(test_data_dir_));

    const bool enable_pixel_output = true;
    context_factories_ =
        std::make_unique<TestContextFactories>(enable_pixel_output, GetParam());

    const gfx::Rect host_bounds(10, 10, 500, 500);
    compositor_host_.reset(TestCompositorHost::Create(
        host_bounds, context_factories_->GetContextFactory()));
    compositor_host_->Show();
  }

  void TearDown() override {
    ResetCompositor();
    context_factories_.reset();
  }

  Compositor* GetCompositor() { return compositor_host_->GetCompositor(); }

  void ResetCompositor() {
    compositor_host_.reset();
  }

  std::unique_ptr<Layer> CreateLayer(LayerType type) {
    return std::make_unique<Layer>(type);
  }

  std::unique_ptr<Layer> CreateColorLayer(SkColor color,
                                          const gfx::Rect& bounds) {
    auto layer = std::make_unique<ColoredLayer>(color);
    layer->SetBounds(bounds);
    return layer;
  }

  std::unique_ptr<Layer> CreateNoTextureLayer(const gfx::Rect& bounds) {
    std::unique_ptr<Layer> layer = CreateLayer(LAYER_NOT_DRAWN);
    layer->SetBounds(bounds);
    return layer;
  }

  void DrawTree(Layer* root) {
    GetCompositor()->SetRootLayer(root);
    GetCompositor()->ScheduleDraw();
    WaitForSwap();
  }

  void ReadPixels(SkBitmap* bitmap) {
    ReadPixels(bitmap, gfx::Rect(GetCompositor()->size()));
  }

  void ReadPixels(SkBitmap* bitmap, gfx::Rect source_rect) {
    scoped_refptr<ReadbackHolder> holder(new ReadbackHolder);
    std::unique_ptr<viz::CopyOutputRequest> request =
        std::make_unique<viz::CopyOutputRequest>(
            viz::CopyOutputRequest::ResultFormat::RGBA_BITMAP,
            base::BindOnce(&ReadbackHolder::OutputRequestCallback, holder));
    request->set_area(source_rect);

    GetCompositor()->root_layer()->RequestCopyOfOutput(std::move(request));

    // Wait for copy response.  This needs to wait as the compositor could
    // be in the middle of a draw right now, and the commit with the
    // copy output request may not be done on the first draw.
    for (int i = 0; i < 2; i++) {
      GetCompositor()->ScheduleFullRedraw();
      WaitForDraw();
    }

    // Waits for the callback to finish run and return result.
    holder->WaitForReadback();

    *bitmap = holder->result();
  }

  void WaitForDraw() {
    ui::DrawWaiterForTest::WaitForCompositingStarted(GetCompositor());
  }

  void WaitForSwap() {
    ui::DrawWaiterForTest::WaitForCompositingEnded(GetCompositor());
  }

  void WaitForCommit() {
    ui::DrawWaiterForTest::WaitForCommit(GetCompositor());
  }

  // Invalidates the entire contents of the layer.
  void SchedulePaintForLayer(Layer* layer) {
    layer->SchedulePaint(
        gfx::Rect(0, 0, layer->bounds().width(), layer->bounds().height()));
  }

  const base::FilePath& test_data_dir() const { return test_data_dir_; }

 private:
  class ReadbackHolder : public base::RefCountedThreadSafe<ReadbackHolder> {
   public:
    ReadbackHolder() : run_loop_(std::make_unique<base::RunLoop>()) {}

    void OutputRequestCallback(std::unique_ptr<viz::CopyOutputResult> result) {
      if (result->IsEmpty())
        result_.reset();
      else
        result_ = std::make_unique<SkBitmap>(result->AsSkBitmap());
      run_loop_->Quit();
    }

    void WaitForReadback() { run_loop_->Run(); }

    const SkBitmap& result() const { return *result_; }

   private:
    friend class base::RefCountedThreadSafe<ReadbackHolder>;

    virtual ~ReadbackHolder() {}

    std::unique_ptr<SkBitmap> result_;
    std::unique_ptr<base::RunLoop> run_loop_;
  };

  base::test::TaskEnvironment task_environment_;
  std::unique_ptr<TestContextFactories> context_factories_;
  std::unique_ptr<TestCompositorHost> compositor_host_;

  // The root directory for test files.
  base::FilePath test_data_dir_;

  DISALLOW_COPY_AND_ASSIGN(LayerWithRealCompositorTest);
};

// LayerDelegate that paints colors to the layer.
class TestLayerDelegate : public LayerDelegate {
 public:
  TestLayerDelegate() { reset(); }
  ~TestLayerDelegate() override {}

  void AddColor(SkColor color) {
    colors_.push_back(color);
  }

  int color_index() const { return color_index_; }

  float device_scale_factor() const {
    return device_scale_factor_;
  }

  void set_layer_bounds(const gfx::Rect& layer_bounds) {
    layer_bounds_ = layer_bounds;
  }

  // Overridden from LayerDelegate:
  void OnPaintLayer(const ui::PaintContext& context) override {
    ui::PaintRecorder recorder(context, layer_bounds_.size());
    recorder.canvas()->DrawColor(colors_[color_index_]);
    color_index_ = (color_index_ + 1) % static_cast<int>(colors_.size());
  }

  void OnDeviceScaleFactorChanged(float old_device_scale_factor,
                                  float new_device_scale_factor) override {
    device_scale_factor_ = new_device_scale_factor;
  }

  MOCK_METHOD2(OnLayerBoundsChanged,
               void(const gfx::Rect&, PropertyChangeReason));
  MOCK_METHOD2(OnLayerTransformed,
               void(const gfx::Transform&, PropertyChangeReason));
  MOCK_METHOD1(OnLayerOpacityChanged, void(PropertyChangeReason));
  MOCK_METHOD0(OnLayerAlphaShapeChanged, void());

  void reset() {
    color_index_ = 0;
    device_scale_factor_ = 0.0f;
  }

 private:
  std::vector<SkColor> colors_;
  int color_index_;
  float device_scale_factor_;
  gfx::Rect layer_bounds_;

  DISALLOW_COPY_AND_ASSIGN(TestLayerDelegate);
};

// LayerDelegate that verifies that a layer was asked to update its canvas.
class DrawTreeLayerDelegate : public LayerDelegate {
 public:
  explicit DrawTreeLayerDelegate(const gfx::Rect& layer_bounds)
      : painted_(false), layer_bounds_(layer_bounds) {}
  ~DrawTreeLayerDelegate() override = default;

  void Reset() {
    painted_ = false;
  }

  bool painted() const { return painted_; }

 private:
  // Overridden from LayerDelegate:
  void OnPaintLayer(const ui::PaintContext& context) override {
    painted_ = true;
    ui::PaintRecorder recorder(context, layer_bounds_.size());
    recorder.canvas()->DrawColor(SK_ColorWHITE);
  }
  void OnDeviceScaleFactorChanged(float old_device_scale_factor,
                                  float new_device_scale_factor) override {}

  bool painted_;
  const gfx::Rect layer_bounds_;

  DISALLOW_COPY_AND_ASSIGN(DrawTreeLayerDelegate);
};

// The simplest possible layer delegate. Does nothing.
class NullLayerDelegate : public LayerDelegate {
 public:
  NullLayerDelegate() {}
  ~NullLayerDelegate() override {}

  gfx::Rect invalidation() const { return invalidation_; }

 private:
  gfx::Rect invalidation_;

  // Overridden from LayerDelegate:
  void OnPaintLayer(const ui::PaintContext& context) override {
    invalidation_ = context.InvalidationForTesting();
  }
  void OnDeviceScaleFactorChanged(float old_device_scale_factor,
                                  float new_device_scale_factor) override {}

  DISALLOW_COPY_AND_ASSIGN(NullLayerDelegate);
};

// Remembers if it has been notified.
class TestCompositorObserver : public CompositorObserver {
 public:
  TestCompositorObserver() = default;

  bool committed() const { return committed_; }
  bool notified() const { return started_ && ended_; }

  void Reset() {
    committed_ = false;
    started_ = false;
    ended_ = false;
  }

 private:
  void OnCompositingDidCommit(Compositor* compositor) override {
    committed_ = true;
  }

  void OnCompositingStarted(Compositor* compositor,
                            base::TimeTicks start_time) override {
    started_ = true;
  }

  void OnCompositingEnded(Compositor* compositor) override { ended_ = true; }

  bool committed_ = false;
  bool started_ = false;
  bool ended_ = false;

  DISALLOW_COPY_AND_ASSIGN(TestCompositorObserver);
};

class TestCompositorAnimationObserver : public CompositorAnimationObserver {
 public:
  explicit TestCompositorAnimationObserver(ui::Compositor* compositor)
      : compositor_(compositor),
        animation_step_count_(0),
        shutdown_(false) {
    DCHECK(compositor_);
    compositor_->AddAnimationObserver(this);
  }

  ~TestCompositorAnimationObserver() override {
    if (compositor_)
      compositor_->RemoveAnimationObserver(this);
  }

  size_t animation_step_count() const { return animation_step_count_; }
  bool shutdown() const { return shutdown_; }

 private:
  void OnAnimationStep(base::TimeTicks timestamp) override {
    ++animation_step_count_;
  }

  void OnCompositingShuttingDown(Compositor* compositor) override {
    DCHECK_EQ(compositor_, compositor);
    compositor_->RemoveAnimationObserver(this);
    compositor_ = nullptr;
    shutdown_ = true;
  }

  ui::Compositor* compositor_;
  size_t animation_step_count_;
  bool shutdown_;

  DISALLOW_COPY_AND_ASSIGN(TestCompositorAnimationObserver);
};

// An animation observer that invokes a callback when the animation ends.
class TestCallbackAnimationObserver : public ImplicitAnimationObserver {
 public:
  TestCallbackAnimationObserver() = default;

  void SetCallback(base::OnceClosure callback) {
    callback_ = std::move(callback);
  }

  // ui::ImplicitAnimationObserver overrides:
  void OnImplicitAnimationsCompleted() override {}
  void OnLayerAnimationEnded(LayerAnimationSequence* sequence) override {
    if (callback_)
      std::move(callback_).Run();
  }

 private:
  base::OnceClosure callback_;
};

}  // namespace

INSTANTIATE_TEST_SUITE_P(All, LayerWithRealCompositorTest, ::testing::Bool());

TEST_P(LayerWithRealCompositorTest, Draw) {
  std::unique_ptr<Layer> layer =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 50, 50));
  DrawTree(layer.get());
}

// Create this hierarchy:
// L1 - red
// +-- L2 - blue
// |   +-- L3 - yellow
// +-- L4 - magenta
//
TEST_P(LayerWithRealCompositorTest, Hierarchy) {
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 400, 400));
  std::unique_ptr<Layer> l2 =
      CreateColorLayer(SK_ColorBLUE, gfx::Rect(10, 10, 350, 350));
  std::unique_ptr<Layer> l3 =
      CreateColorLayer(SK_ColorYELLOW, gfx::Rect(5, 5, 25, 25));
  std::unique_ptr<Layer> l4 =
      CreateColorLayer(SK_ColorMAGENTA, gfx::Rect(300, 300, 100, 100));

  l1->Add(l2.get());
  l1->Add(l4.get());
  l2->Add(l3.get());

  DrawTree(l1.get());
}

class LayerWithDelegateTest : public testing::Test {
 public:
  LayerWithDelegateTest()
      : task_environment_(base::test::TaskEnvironment::MainThreadType::UI) {}
  ~LayerWithDelegateTest() override {}

  // Overridden from testing::Test:
  void SetUp() override {
    const bool enable_pixel_output = false;
    context_factories_ =
        std::make_unique<TestContextFactories>(enable_pixel_output);

    const gfx::Rect host_bounds(1000, 1000);
    compositor_host_.reset(TestCompositorHost::Create(
        host_bounds, context_factories_->GetContextFactory()));
    compositor_host_->Show();
  }

  void TearDown() override {
    compositor_host_.reset();
    context_factories_.reset();
  }

  Compositor* compositor() { return compositor_host_->GetCompositor(); }

  virtual std::unique_ptr<Layer> CreateLayer(LayerType type) {
    return std::make_unique<Layer>(type);
  }

  std::unique_ptr<Layer> CreateColorLayer(SkColor color,
                                          const gfx::Rect& bounds) {
    auto layer = std::make_unique<ColoredLayer>(color);
    layer->SetBounds(bounds);
    return layer;
  }

  virtual std::unique_ptr<Layer> CreateNoTextureLayer(const gfx::Rect& bounds) {
    std::unique_ptr<Layer> layer = CreateLayer(LAYER_NOT_DRAWN);
    layer->SetBounds(bounds);
    return layer;
  }

  void DrawTree(Layer* root) {
    compositor()->SetRootLayer(root);
    Draw();
  }

  // Invalidates the entire contents of the layer.
  void SchedulePaintForLayer(Layer* layer) {
    layer->SchedulePaint(
        gfx::Rect(0, 0, layer->bounds().width(), layer->bounds().height()));
  }

  // Invokes DrawTree on the compositor.
  void Draw() {
    compositor()->ScheduleDraw();
    WaitForDraw();
  }

  void WaitForDraw() {
    DrawWaiterForTest::WaitForCompositingStarted(compositor());
  }

  void WaitForCommit() {
    DrawWaiterForTest::WaitForCommit(compositor());
  }

 private:
  base::test::TaskEnvironment task_environment_;
  std::unique_ptr<TestContextFactories> context_factories_;
  std::unique_ptr<TestCompositorHost> compositor_host_;

  DISALLOW_COPY_AND_ASSIGN(LayerWithDelegateTest);
};

void ReturnMailbox(bool* run, const gpu::SyncToken& sync_token, bool is_lost) {
  *run = true;
}

TEST(LayerStandaloneTest, ReleaseMailboxOnDestruction) {
  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  bool callback_run = false;

  constexpr gfx::Size size(64, 64);
  auto resource = viz::TransferableResource::MakeGL(
      gpu::Mailbox::Generate(), GL_LINEAR, GL_TEXTURE_2D, gpu::SyncToken(),
      size, false /* is_overlay_candidate */);
  layer->SetTransferableResource(
      resource,
      viz::SingleReleaseCallback::Create(
          base::BindOnce(ReturnMailbox, &callback_run)),
      gfx::Size(10, 10));
  EXPECT_FALSE(callback_run);
  layer.reset();
  EXPECT_TRUE(callback_run);
}

// L1
//  +-- L2
TEST_F(LayerWithDelegateTest, ConvertPointToLayer_Simple) {
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 400, 400));
  std::unique_ptr<Layer> l2 =
      CreateColorLayer(SK_ColorBLUE, gfx::Rect(10, 10, 350, 350));
  l1->Add(l2.get());
  DrawTree(l1.get());

  gfx::PointF point1_in_l2_coords(5, 5);
  Layer::ConvertPointToLayer(l2.get(), l1.get(), &point1_in_l2_coords);
  gfx::PointF point1_in_l1_coords(15, 15);
  EXPECT_EQ(point1_in_l1_coords, point1_in_l2_coords);

  gfx::PointF point2_in_l1_coords(5, 5);
  Layer::ConvertPointToLayer(l1.get(), l2.get(), &point2_in_l1_coords);
  gfx::PointF point2_in_l2_coords(-5, -5);
  EXPECT_EQ(point2_in_l2_coords, point2_in_l1_coords);
}

// L1
//  +-- L2
//       +-- L3
TEST_F(LayerWithDelegateTest, ConvertPointToLayer_Medium) {
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 400, 400));
  std::unique_ptr<Layer> l2 =
      CreateColorLayer(SK_ColorBLUE, gfx::Rect(10, 10, 350, 350));
  std::unique_ptr<Layer> l3 =
      CreateColorLayer(SK_ColorYELLOW, gfx::Rect(10, 10, 100, 100));
  l1->Add(l2.get());
  l2->Add(l3.get());
  DrawTree(l1.get());

  gfx::PointF point1_in_l3_coords(5, 5);
  Layer::ConvertPointToLayer(l3.get(), l1.get(), &point1_in_l3_coords);
  gfx::PointF point1_in_l1_coords(25, 25);
  EXPECT_EQ(point1_in_l1_coords, point1_in_l3_coords);

  gfx::PointF point2_in_l1_coords(5, 5);
  Layer::ConvertPointToLayer(l1.get(), l3.get(), &point2_in_l1_coords);
  gfx::PointF point2_in_l3_coords(-15, -15);
  EXPECT_EQ(point2_in_l3_coords, point2_in_l1_coords);
}

TEST_P(LayerWithRealCompositorTest, Delegate) {
  // This test makes sure that whenever paint happens at a layer, its layer
  // delegate gets the paint, which in this test update its color and
  // |color_index|.
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorBLACK, gfx::Rect(20, 20, 400, 400));
  GetCompositor()->SetRootLayer(l1.get());
  WaitForDraw();

  TestLayerDelegate delegate;
  l1->set_delegate(&delegate);
  delegate.set_layer_bounds(l1->bounds());
  delegate.AddColor(SK_ColorWHITE);
  delegate.AddColor(SK_ColorYELLOW);
  delegate.AddColor(SK_ColorGREEN);

  l1->SchedulePaint(gfx::Rect(0, 0, 400, 400));
  WaitForDraw();
  // Test that paint happened at layer delegate.
  EXPECT_EQ(1, delegate.color_index());

  l1->SchedulePaint(gfx::Rect(10, 10, 200, 200));
  WaitForDraw();
  // Test that paint happened at layer delegate.
  EXPECT_EQ(2, delegate.color_index());

  l1->SchedulePaint(gfx::Rect(5, 5, 50, 50));
  WaitForDraw();
  // Test that paint happened at layer delegate.
  EXPECT_EQ(0, delegate.color_index());
}

TEST_P(LayerWithRealCompositorTest, DrawTree) {
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 400, 400));
  std::unique_ptr<Layer> l2 =
      CreateColorLayer(SK_ColorBLUE, gfx::Rect(10, 10, 350, 350));
  std::unique_ptr<Layer> l3 =
      CreateColorLayer(SK_ColorYELLOW, gfx::Rect(10, 10, 100, 100));
  l1->Add(l2.get());
  l2->Add(l3.get());

  GetCompositor()->SetRootLayer(l1.get());
  WaitForDraw();

  DrawTreeLayerDelegate d1(l1->bounds());
  l1->set_delegate(&d1);
  DrawTreeLayerDelegate d2(l2->bounds());
  l2->set_delegate(&d2);
  DrawTreeLayerDelegate d3(l3->bounds());
  l3->set_delegate(&d3);

  l2->SchedulePaint(gfx::Rect(5, 5, 5, 5));
  WaitForDraw();
  EXPECT_FALSE(d1.painted());
  EXPECT_TRUE(d2.painted());
  EXPECT_FALSE(d3.painted());
}

// Tests that scheduling paint on a layer with a mask updates the mask.
TEST_P(LayerWithRealCompositorTest, SchedulePaintUpdatesMask) {
  std::unique_ptr<Layer> layer =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 400, 400));
  std::unique_ptr<Layer> mask_layer = CreateLayer(ui::LAYER_TEXTURED);
  mask_layer->SetBounds(gfx::Rect(layer->GetTargetBounds().size()));
  layer->SetMaskLayer(mask_layer.get());

  GetCompositor()->SetRootLayer(layer.get());
  WaitForDraw();

  DrawTreeLayerDelegate d1(layer->bounds());
  layer->set_delegate(&d1);
  DrawTreeLayerDelegate d2(mask_layer->bounds());
  mask_layer->set_delegate(&d2);

  layer->SchedulePaint(gfx::Rect(5, 5, 5, 5));
  WaitForDraw();
  EXPECT_TRUE(d1.painted());
  EXPECT_TRUE(d2.painted());
}

// Tests no-texture Layers.
// Create this hierarchy:
// L1 - red
// +-- L2 - NO TEXTURE
// |   +-- L3 - yellow
// +-- L4 - magenta
//
TEST_P(LayerWithRealCompositorTest, HierarchyNoTexture) {
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 400, 400));
  std::unique_ptr<Layer> l2 = CreateNoTextureLayer(gfx::Rect(10, 10, 350, 350));
  std::unique_ptr<Layer> l3 =
      CreateColorLayer(SK_ColorYELLOW, gfx::Rect(5, 5, 25, 25));
  std::unique_ptr<Layer> l4 =
      CreateColorLayer(SK_ColorMAGENTA, gfx::Rect(300, 300, 100, 100));

  l1->Add(l2.get());
  l1->Add(l4.get());
  l2->Add(l3.get());

  GetCompositor()->SetRootLayer(l1.get());
  WaitForDraw();

  DrawTreeLayerDelegate d2(l2->bounds());
  l2->set_delegate(&d2);
  DrawTreeLayerDelegate d3(l3->bounds());
  l3->set_delegate(&d3);

  l2->SchedulePaint(gfx::Rect(5, 5, 5, 5));
  l3->SchedulePaint(gfx::Rect(5, 5, 5, 5));
  WaitForDraw();

  // |d2| should not have received a paint notification since it has no texture.
  EXPECT_FALSE(d2.painted());
  // |d3| should have received a paint notification.
  EXPECT_TRUE(d3.painted());
}

TEST_F(LayerWithDelegateTest, Cloning) {
  std::unique_ptr<Layer> layer = CreateLayer(LAYER_SOLID_COLOR);

  gfx::Transform transform;
  transform.Scale(2, 1);
  transform.Translate(10, 5);

  layer->SetTransform(transform);
  layer->SetColor(SK_ColorRED);
  layer->SetLayerInverted(true);
  layer->AddCacheRenderSurfaceRequest();
  layer->AddTrilinearFilteringRequest();
  layer->SetRoundedCornerRadius({1, 2, 4, 5});
  layer->SetIsFastRoundedCorner(true);

  auto clone = layer->Clone();

  // Cloning preserves layer state.
  EXPECT_EQ(transform, clone->GetTargetTransform());
  EXPECT_EQ(SK_ColorRED, clone->background_color());
  EXPECT_EQ(SK_ColorRED, clone->GetTargetColor());
  EXPECT_TRUE(clone->layer_inverted());
  // Cloning should not preserve cache_render_surface flag.
  EXPECT_NE(layer->cc_layer_for_testing()->cache_render_surface(),
            clone->cc_layer_for_testing()->cache_render_surface());
  // Cloning should not preserve trilinear_filtering flag.
  EXPECT_NE(layer->cc_layer_for_testing()->trilinear_filtering(),
            clone->cc_layer_for_testing()->trilinear_filtering());
  EXPECT_EQ(layer->rounded_corner_radii(), clone->rounded_corner_radii());
  EXPECT_EQ(layer->is_fast_rounded_corner(), clone->is_fast_rounded_corner());

  layer->SetTransform(gfx::Transform());
  layer->SetColor(SK_ColorGREEN);
  layer->SetLayerInverted(false);
  layer->SetIsFastRoundedCorner(false);
  layer->SetRoundedCornerRadius({3, 6, 9, 12});

  // The clone is an independent copy, so state changes do not propagate.
  EXPECT_EQ(transform, clone->GetTargetTransform());
  EXPECT_EQ(SK_ColorRED, clone->background_color());
  EXPECT_EQ(SK_ColorRED, clone->GetTargetColor());
  EXPECT_TRUE(clone->layer_inverted());
  EXPECT_FALSE(layer->is_fast_rounded_corner());
  EXPECT_TRUE(clone->is_fast_rounded_corner());
  EXPECT_NE(layer->rounded_corner_radii(), clone->rounded_corner_radii());

  constexpr SkColor kTransparent = SK_ColorTRANSPARENT;
  layer->SetColor(kTransparent);
  layer->SetFillsBoundsOpaquely(false);
  // Color and opaqueness targets should be preserved during cloning, even after
  // switching away from solid color content.
  layer->SwitchCCLayerForTest();

  clone = layer->Clone();

  // The clone is a copy of the latest state.
  EXPECT_TRUE(clone->GetTargetTransform().IsIdentity());
  EXPECT_EQ(kTransparent, clone->background_color());
  EXPECT_EQ(kTransparent, clone->GetTargetColor());
  EXPECT_FALSE(clone->layer_inverted());
  EXPECT_FALSE(clone->fills_bounds_opaquely());

  // A solid color layer with transparent color can be marked as opaque. The
  // clone should retain this state.
  layer = CreateLayer(LAYER_SOLID_COLOR);
  layer->SetColor(kTransparent);
  layer->SetFillsBoundsOpaquely(true);

  clone = layer->Clone();
  EXPECT_TRUE(clone->GetTargetTransform().IsIdentity());
  EXPECT_EQ(kTransparent, clone->background_color());
  EXPECT_EQ(kTransparent, clone->GetTargetColor());
  EXPECT_FALSE(clone->layer_inverted());
  EXPECT_TRUE(clone->fills_bounds_opaquely());

  layer = CreateLayer(LAYER_SOLID_COLOR);
  layer->SetVisible(true);
  layer->SetOpacity(1.0f);
  layer->SetColor(SK_ColorRED);

  ScopedLayerAnimationSettings settings(layer->GetAnimator());
  layer->SetVisible(false);
  layer->SetOpacity(0.0f);
  layer->SetColor(SK_ColorGREEN);

  EXPECT_TRUE(layer->visible());
  EXPECT_EQ(1.0f, layer->opacity());
  EXPECT_EQ(SK_ColorRED, layer->background_color());

  clone = layer->Clone();

  // Cloning copies animation targets.
  EXPECT_FALSE(clone->visible());
  EXPECT_EQ(0.0f, clone->opacity());
  EXPECT_EQ(SK_ColorGREEN, clone->background_color());
}

TEST_F(LayerWithDelegateTest, Mirroring) {
  std::unique_ptr<Layer> root = CreateNoTextureLayer(gfx::Rect(0, 0, 100, 100));
  std::unique_ptr<Layer> child = CreateLayer(LAYER_TEXTURED);

  const gfx::Rect bounds(0, 0, 50, 50);
  child->SetBounds(bounds);
  child->SetVisible(true);

  DrawTreeLayerDelegate delegate(child->bounds());
  child->set_delegate(&delegate);

  const auto mirror1 = child->Mirror();

  // Bounds and visibility are preserved.
  EXPECT_EQ(bounds, mirror1->bounds());
  EXPECT_TRUE(mirror1->visible());

  root->Add(child.get());
  root->Add(mirror1.get());

  DrawTree(root.get());
  EXPECT_TRUE(delegate.painted());
  delegate.Reset();

  // Both layers should be clean.
  EXPECT_TRUE(child->damaged_region_for_testing().IsEmpty());
  EXPECT_TRUE(mirror1->damaged_region_for_testing().IsEmpty());

  const gfx::Rect damaged_rect(10, 10, 20, 20);
  EXPECT_TRUE(child->SchedulePaint(damaged_rect));
  EXPECT_EQ(damaged_rect, child->damaged_region_for_testing().bounds());

  DrawTree(root.get());
  EXPECT_TRUE(delegate.painted());
  delegate.Reset();

  // Damage should be propagated to the mirror.
  EXPECT_EQ(damaged_rect, mirror1->damaged_region_for_testing().bounds());
  EXPECT_TRUE(child->damaged_region_for_testing().IsEmpty());

  DrawTree(root.get());
  EXPECT_TRUE(delegate.painted());

  // Mirror should be clean.
  EXPECT_TRUE(mirror1->damaged_region_for_testing().IsEmpty());

  const auto mirror2 = child->Mirror();
  root->Add(mirror2.get());

  // Bounds are not synchronized by default.
  const gfx::Rect new_bounds(10, 10, 10, 10);
  child->SetBounds(new_bounds);
  EXPECT_EQ(bounds, mirror1->bounds());
  EXPECT_EQ(bounds, mirror2->bounds());
  child->SetBounds(bounds);

  // Bounds should be synchronized only for the mirror layer that requested it.
  mirror1->set_sync_bounds_with_source(true);
  child->SetBounds(new_bounds);
  EXPECT_EQ(new_bounds, mirror1->bounds());
  EXPECT_EQ(bounds, mirror2->bounds());

  // Check for rounded corner mirror behavior
  EXPECT_TRUE(mirror1->rounded_corner_radii().IsEmpty());
  EXPECT_FALSE(mirror1->is_fast_rounded_corner());
  constexpr gfx::RoundedCornersF kCornerRadii(2, 3, 4, 5);
  child->SetRoundedCornerRadius(kCornerRadii);
  child->SetIsFastRoundedCorner(true);
  EXPECT_EQ(kCornerRadii, mirror1->rounded_corner_radii());
  EXPECT_TRUE(mirror1->is_fast_rounded_corner());
}

// Tests for SurfaceLayer cloning and mirroring. This tests certain properties
// are preserved.
TEST_F(LayerWithDelegateTest, SurfaceLayerCloneAndMirror) {
  const viz::FrameSinkId arbitrary_frame_sink(1, 1);
  viz::ParentLocalSurfaceIdAllocator allocator;
  std::unique_ptr<Layer> layer = CreateLayer(LAYER_SOLID_COLOR);

  allocator.GenerateId();
  viz::LocalSurfaceId local_surface_id =
      allocator.GetCurrentLocalSurfaceIdAllocation().local_surface_id();
  viz::SurfaceId surface_id_one(arbitrary_frame_sink, local_surface_id);
  layer->SetShowSurface(surface_id_one, gfx::Size(10, 10), SK_ColorWHITE,
                        cc::DeadlinePolicy::UseDefaultDeadline(), false);
  EXPECT_FALSE(layer->StretchContentToFillBounds());

  auto clone = layer->Clone();
  EXPECT_FALSE(clone->StretchContentToFillBounds());
  auto mirror = layer->Mirror();
  EXPECT_FALSE(mirror->StretchContentToFillBounds());

  allocator.GenerateId();
  local_surface_id =
      allocator.GetCurrentLocalSurfaceIdAllocation().local_surface_id();
  viz::SurfaceId surface_id_two(arbitrary_frame_sink, local_surface_id);
  layer->SetShowSurface(surface_id_two, gfx::Size(10, 10), SK_ColorWHITE,
                        cc::DeadlinePolicy::UseDefaultDeadline(), true);
  EXPECT_TRUE(layer->StretchContentToFillBounds());

  clone = layer->Clone();
  EXPECT_TRUE(clone->StretchContentToFillBounds());
  mirror = layer->Mirror();
  EXPECT_TRUE(mirror->StretchContentToFillBounds());
}

class LayerWithNullDelegateTest : public LayerWithDelegateTest {
 public:
  LayerWithNullDelegateTest() {}
  ~LayerWithNullDelegateTest() override {}

  void SetUp() override {
    LayerWithDelegateTest::SetUp();
    default_layer_delegate_ = std::make_unique<NullLayerDelegate>();
  }

  std::unique_ptr<Layer> CreateLayer(LayerType type) override {
    auto layer = std::make_unique<Layer>(type);
    layer->set_delegate(default_layer_delegate_.get());
    return layer;
  }

  std::unique_ptr<Layer> CreateTextureRootLayer(const gfx::Rect& bounds) {
    std::unique_ptr<Layer> layer = CreateTextureLayer(bounds);
    compositor()->SetRootLayer(layer.get());
    return layer;
  }

  std::unique_ptr<Layer> CreateTextureLayer(const gfx::Rect& bounds) {
    std::unique_ptr<Layer> layer = CreateLayer(LAYER_TEXTURED);
    layer->SetBounds(bounds);
    return layer;
  }

  std::unique_ptr<Layer> CreateNoTextureLayer(
      const gfx::Rect& bounds) override {
    std::unique_ptr<Layer> layer = CreateLayer(LAYER_NOT_DRAWN);
    layer->SetBounds(bounds);
    return layer;
  }

  gfx::Rect LastInvalidation() const {
    return default_layer_delegate_->invalidation();
  }

 private:
  std::unique_ptr<NullLayerDelegate> default_layer_delegate_;

  DISALLOW_COPY_AND_ASSIGN(LayerWithNullDelegateTest);
};

TEST_F(LayerWithNullDelegateTest, SwitchLayerPreservesCCLayerState) {
  std::unique_ptr<Layer> l1 = CreateLayer(LAYER_SOLID_COLOR);
  l1->SetFillsBoundsOpaquely(true);
  l1->SetVisible(false);
  l1->SetBounds(gfx::Rect(4, 5));

  constexpr gfx::RoundedCornersF kCornerRadii(1, 2, 3, 4);
  l1->SetRoundedCornerRadius(kCornerRadii);
  l1->SetIsFastRoundedCorner(true);

  EXPECT_EQ(gfx::Point3F(), l1->cc_layer_for_testing()->transform_origin());
  EXPECT_TRUE(l1->cc_layer_for_testing()->DrawsContent());
  EXPECT_TRUE(l1->cc_layer_for_testing()->contents_opaque());
  EXPECT_TRUE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_EQ(gfx::Size(4, 5), l1->cc_layer_for_testing()->bounds());
  EXPECT_TRUE(l1->cc_layer_for_testing()->HasRoundedCorner());
  EXPECT_EQ(l1->cc_layer_for_testing()->corner_radii(), kCornerRadii);
  EXPECT_TRUE(l1->cc_layer_for_testing()->is_fast_rounded_corner());

  cc::Layer* before_layer = l1->cc_layer_for_testing();

  bool callback1_run = false;
  constexpr gfx::Size size(64, 64);
  auto resource = viz::TransferableResource::MakeGL(
      gpu::Mailbox::Generate(), GL_LINEAR, GL_TEXTURE_2D, gpu::SyncToken(),
      size, false /* is_overlay_candidate */);
  l1->SetTransferableResource(resource,
                              viz::SingleReleaseCallback::Create(base::BindOnce(
                                  ReturnMailbox, &callback1_run)),
                              gfx::Size(10, 10));

  EXPECT_NE(before_layer, l1->cc_layer_for_testing());

  EXPECT_EQ(gfx::Point3F(), l1->cc_layer_for_testing()->transform_origin());
  EXPECT_TRUE(l1->cc_layer_for_testing()->DrawsContent());
  EXPECT_TRUE(l1->cc_layer_for_testing()->contents_opaque());
  EXPECT_TRUE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_EQ(gfx::Size(4, 5), l1->cc_layer_for_testing()->bounds());
  EXPECT_TRUE(l1->cc_layer_for_testing()->HasRoundedCorner());
  EXPECT_EQ(l1->cc_layer_for_testing()->corner_radii(), kCornerRadii);
  EXPECT_TRUE(l1->cc_layer_for_testing()->is_fast_rounded_corner());
  EXPECT_FALSE(callback1_run);

  bool callback2_run = false;
  resource = viz::TransferableResource::MakeGL(
      gpu::Mailbox::Generate(), GL_LINEAR, GL_TEXTURE_2D, gpu::SyncToken(),
      size, false /* is_overlay_candidate */);
  l1->SetTransferableResource(resource,
                              viz::SingleReleaseCallback::Create(base::BindOnce(
                                  ReturnMailbox, &callback2_run)),
                              gfx::Size(10, 10));
  EXPECT_TRUE(callback1_run);
  EXPECT_FALSE(callback2_run);

  // Show solid color instead.
  l1->SetShowSolidColorContent();
  EXPECT_EQ(gfx::Point3F(), l1->cc_layer_for_testing()->transform_origin());
  EXPECT_TRUE(l1->cc_layer_for_testing()->DrawsContent());
  EXPECT_TRUE(l1->cc_layer_for_testing()->contents_opaque());
  EXPECT_TRUE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_EQ(gfx::Size(4, 5), l1->cc_layer_for_testing()->bounds());
  EXPECT_TRUE(l1->cc_layer_for_testing()->HasRoundedCorner());
  EXPECT_EQ(l1->cc_layer_for_testing()->corner_radii(), kCornerRadii);
  EXPECT_TRUE(l1->cc_layer_for_testing()->is_fast_rounded_corner());
  EXPECT_TRUE(callback2_run);

  before_layer = l1->cc_layer_for_testing();

  // Back to a texture, without changing the bounds of the layer or the texture.
  bool callback3_run = false;
  resource = viz::TransferableResource::MakeGL(
      gpu::Mailbox::Generate(), GL_LINEAR, GL_TEXTURE_2D, gpu::SyncToken(),
      size, false /* is_overlay_candidate */);
  l1->SetTransferableResource(resource,
                              viz::SingleReleaseCallback::Create(base::BindOnce(
                                  ReturnMailbox, &callback3_run)),
                              gfx::Size(10, 10));

  EXPECT_NE(before_layer, l1->cc_layer_for_testing());

  EXPECT_EQ(gfx::Point3F(), l1->cc_layer_for_testing()->transform_origin());
  EXPECT_TRUE(l1->cc_layer_for_testing()->DrawsContent());
  EXPECT_TRUE(l1->cc_layer_for_testing()->contents_opaque());
  EXPECT_TRUE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_EQ(gfx::Size(4, 5), l1->cc_layer_for_testing()->bounds());
  EXPECT_TRUE(l1->cc_layer_for_testing()->HasRoundedCorner());
  EXPECT_EQ(l1->cc_layer_for_testing()->corner_radii(), kCornerRadii);
  EXPECT_TRUE(l1->cc_layer_for_testing()->is_fast_rounded_corner());
  EXPECT_FALSE(callback3_run);

  // Release the on |l1| mailbox to clean up the test.
  l1->SetShowSolidColorContent();
}

// Various visible/drawn assertions.
TEST_F(LayerWithNullDelegateTest, Visibility) {
  auto l1 = std::make_unique<Layer>(LAYER_TEXTURED);
  auto l2 = std::make_unique<Layer>(LAYER_TEXTURED);
  auto l3 = std::make_unique<Layer>(LAYER_TEXTURED);
  l1->Add(l2.get());
  l2->Add(l3.get());

  NullLayerDelegate delegate;
  l1->set_delegate(&delegate);
  l2->set_delegate(&delegate);
  l3->set_delegate(&delegate);

  // Layers should initially be drawn.
  EXPECT_TRUE(l1->IsDrawn());
  EXPECT_TRUE(l2->IsDrawn());
  EXPECT_TRUE(l3->IsDrawn());
  EXPECT_FALSE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l3->cc_layer_for_testing()->hide_layer_and_subtree());

  compositor()->SetRootLayer(l1.get());

  Draw();

  l1->SetVisible(false);
  EXPECT_FALSE(l1->IsDrawn());
  EXPECT_FALSE(l2->IsDrawn());
  EXPECT_FALSE(l3->IsDrawn());
  EXPECT_TRUE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l3->cc_layer_for_testing()->hide_layer_and_subtree());

  l3->SetVisible(false);
  EXPECT_FALSE(l1->IsDrawn());
  EXPECT_FALSE(l2->IsDrawn());
  EXPECT_FALSE(l3->IsDrawn());
  EXPECT_TRUE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l3->cc_layer_for_testing()->hide_layer_and_subtree());

  l1->SetVisible(true);
  EXPECT_TRUE(l1->IsDrawn());
  EXPECT_TRUE(l2->IsDrawn());
  EXPECT_FALSE(l3->IsDrawn());
  EXPECT_FALSE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l3->cc_layer_for_testing()->hide_layer_and_subtree());
}

// Various visible/drawn assertions.
TEST_F(LayerWithNullDelegateTest, MirroringVisibility) {
  auto l1 = std::make_unique<Layer>(LAYER_TEXTURED);
  auto l2 = std::make_unique<Layer>(LAYER_TEXTURED);
  std::unique_ptr<Layer> l2_mirror = l2->Mirror();
  l1->Add(l2.get());
  l1->Add(l2_mirror.get());

  NullLayerDelegate delegate;
  l1->set_delegate(&delegate);
  l2->set_delegate(&delegate);
  l2_mirror->set_delegate(&delegate);

  // Layers should initially be drawn.
  EXPECT_TRUE(l1->IsDrawn());
  EXPECT_TRUE(l2->IsDrawn());
  EXPECT_TRUE(l2_mirror->IsDrawn());
  EXPECT_FALSE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());

  compositor()->SetRootLayer(l1.get());

  Draw();

  // Hiding the root layer should hide that specific layer and its subtree.
  l1->SetVisible(false);

  // Since the entire subtree is hidden, no layer should be drawn.
  EXPECT_FALSE(l1->IsDrawn());
  EXPECT_FALSE(l2->IsDrawn());
  EXPECT_FALSE(l2_mirror->IsDrawn());

  // The visibitily property for the subtree is rooted at |l1|.
  EXPECT_TRUE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());

  // Hiding |l2| should also set the visibility on its mirror layer. In this
  // case the visibility of |l2| will be mirrored by |l2_mirror|.
  l2->SetVisible(false);

  // None of the layers are drawn since the visibility is false at every node.
  EXPECT_FALSE(l1->IsDrawn());
  EXPECT_FALSE(l2->IsDrawn());
  EXPECT_FALSE(l2_mirror->IsDrawn());

  // Visibility property is set on every node and hence their subtree is also
  // hidden.
  EXPECT_TRUE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());

  // Setting visibility on the root layer should make that layer visible and its
  // subtree ready for visibility.
  l1->SetVisible(true);
  EXPECT_TRUE(l1->IsDrawn());
  EXPECT_FALSE(l2->IsDrawn());
  EXPECT_FALSE(l2_mirror->IsDrawn());
  EXPECT_FALSE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());

  // Setting visibility on the mirrored layer should not effect its source
  // layer.
  l2_mirror->SetVisible(true);
  EXPECT_TRUE(l1->IsDrawn());
  EXPECT_FALSE(l2->IsDrawn());
  EXPECT_TRUE(l2_mirror->IsDrawn());
  EXPECT_FALSE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());

  // Setting visibility on the source layer should keep the mirror layer in
  // sync and not cause any invalid state.
  l2->SetVisible(true);
  EXPECT_TRUE(l1->IsDrawn());
  EXPECT_TRUE(l2->IsDrawn());
  EXPECT_TRUE(l2_mirror->IsDrawn());
  EXPECT_FALSE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());

  // Setting visibility on the mirrored layer should not effect its source
  // layer.
  l2_mirror->SetVisible(false);
  EXPECT_TRUE(l1->IsDrawn());
  EXPECT_TRUE(l2->IsDrawn());
  EXPECT_FALSE(l2_mirror->IsDrawn());
  EXPECT_FALSE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());

  // Setting source layer's visibility to true should update the mirror layer
  // even if the source layer did not change in the process.
  l2->SetVisible(true);
  EXPECT_TRUE(l1->IsDrawn());
  EXPECT_TRUE(l2->IsDrawn());
  EXPECT_TRUE(l2_mirror->IsDrawn());
  EXPECT_FALSE(l1->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_FALSE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());

  // Disable visibility sync on the mirrored layer. Changes in |l2|'s visibility
  // shouldn't affect the visibility of |l2_mirror|.
  l2_mirror->set_sync_visibility_with_source(false);
  l2->SetVisible(false);
  EXPECT_FALSE(l2->IsDrawn());
  EXPECT_TRUE(l2->cc_layer_for_testing()->hide_layer_and_subtree());
  EXPECT_TRUE(l2_mirror->IsDrawn());
  EXPECT_FALSE(l2_mirror->cc_layer_for_testing()->hide_layer_and_subtree());
}

TEST_F(LayerWithDelegateTest, RoundedCorner) {
  gfx::Rect layer_bounds(10, 20, 100, 100);
  constexpr gfx::RoundedCornersF kRadii(5, 10, 15, 20);
  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);

  NullLayerDelegate delegate;
  layer->set_delegate(&delegate);
  layer->SetVisible(true);
  layer->SetBounds(layer_bounds);
  layer->SetMasksToBounds(true);

  compositor()->SetRootLayer(layer.get());
  Draw();

  EXPECT_TRUE(layer->rounded_corner_radii().IsEmpty());

  // Setting a rounded corner radius should set an rrect with bounds same as the
  // layer.
  layer->SetRoundedCornerRadius(kRadii);
  EXPECT_EQ(kRadii, layer->rounded_corner_radii());
}

// Checks that stacking-related methods behave as advertised.
TEST_F(LayerWithNullDelegateTest, Stacking) {
  auto root = std::make_unique<Layer>(LAYER_NOT_DRAWN);
  auto l1 = std::make_unique<Layer>(LAYER_TEXTURED);
  auto l2 = std::make_unique<Layer>(LAYER_TEXTURED);
  auto l3 = std::make_unique<Layer>(LAYER_TEXTURED);
  l1->SetName("1");
  l2->SetName("2");
  l3->SetName("3");
  root->Add(l3.get());
  root->Add(l2.get());
  root->Add(l1.get());

  // Layers' children are stored in bottom-to-top order.
  EXPECT_EQ("3 2 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackAtTop(l3.get());
  EXPECT_EQ("2 1 3", test::ChildLayerNamesAsString(*root.get()));

  root->StackAtTop(l1.get());
  EXPECT_EQ("2 3 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackAtTop(l1.get());
  EXPECT_EQ("2 3 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackAbove(l2.get(), l3.get());
  EXPECT_EQ("3 2 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackAbove(l1.get(), l3.get());
  EXPECT_EQ("3 1 2", test::ChildLayerNamesAsString(*root.get()));

  root->StackAbove(l2.get(), l1.get());
  EXPECT_EQ("3 1 2", test::ChildLayerNamesAsString(*root.get()));

  root->StackAtBottom(l2.get());
  EXPECT_EQ("2 3 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackAtBottom(l3.get());
  EXPECT_EQ("3 2 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackAtBottom(l3.get());
  EXPECT_EQ("3 2 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackBelow(l2.get(), l3.get());
  EXPECT_EQ("2 3 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackBelow(l1.get(), l3.get());
  EXPECT_EQ("2 1 3", test::ChildLayerNamesAsString(*root.get()));

  root->StackBelow(l3.get(), l2.get());
  EXPECT_EQ("3 2 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackBelow(l3.get(), l2.get());
  EXPECT_EQ("3 2 1", test::ChildLayerNamesAsString(*root.get()));

  root->StackBelow(l3.get(), l1.get());
  EXPECT_EQ("2 3 1", test::ChildLayerNamesAsString(*root.get()));

  std::vector<Layer*> child_bottom_stack;
  child_bottom_stack.emplace_back(l1.get());
  root->StackChildrenAtBottom(child_bottom_stack);
  EXPECT_EQ("1 2 3", test::ChildLayerNamesAsString(*root.get()));

  child_bottom_stack.clear();
  child_bottom_stack.emplace_back(l3.get());
  child_bottom_stack.emplace_back(l2.get());
  root->StackChildrenAtBottom(child_bottom_stack);
  EXPECT_EQ("3 2 1", test::ChildLayerNamesAsString(*root.get()));

  child_bottom_stack.clear();
  child_bottom_stack.emplace_back(l2.get());
  child_bottom_stack.emplace_back(l1.get());
  root->StackChildrenAtBottom(child_bottom_stack);
  EXPECT_EQ("2 1 3", test::ChildLayerNamesAsString(*root.get()));

  child_bottom_stack.clear();
  child_bottom_stack.emplace_back(l3.get());
  child_bottom_stack.emplace_back(l1.get());
  child_bottom_stack.emplace_back(l2.get());
  root->StackChildrenAtBottom(child_bottom_stack);
  EXPECT_EQ("3 1 2", test::ChildLayerNamesAsString(*root.get()));

  child_bottom_stack.clear();
  root->StackChildrenAtBottom(child_bottom_stack);
  EXPECT_EQ("3 1 2", test::ChildLayerNamesAsString(*root.get()));
}

// Verifies SetBounds triggers the appropriate painting/drawing.
TEST_F(LayerWithNullDelegateTest, SetBoundsSchedulesPaint) {
  std::unique_ptr<Layer> l1 = CreateTextureLayer(gfx::Rect(0, 0, 200, 200));
  compositor()->SetRootLayer(l1.get());

  Draw();

  l1->SetBounds(gfx::Rect(5, 5, 200, 200));

  // The CompositorDelegate (us) should have been told to draw for a move.
  WaitForDraw();

  l1->SetBounds(gfx::Rect(5, 5, 100, 100));

  // The CompositorDelegate (us) should have been told to draw for a resize.
  WaitForDraw();
}

// Checks that the damage rect for a TextureLayer is empty after a commit.
TEST_F(LayerWithNullDelegateTest, EmptyDamagedRect) {
  base::RunLoop run_loop;
  viz::ReleaseCallback callback = base::BindOnce(
      [](base::RunLoop* run_loop, const gpu::SyncToken& sync_token,
         bool is_lost) { run_loop->Quit(); },
      base::Unretained(&run_loop));

  std::unique_ptr<Layer> root = CreateLayer(LAYER_SOLID_COLOR);
  constexpr gfx::Size size(64, 64);
  auto resource = viz::TransferableResource::MakeGL(
      gpu::Mailbox::Generate(), GL_LINEAR, GL_TEXTURE_2D, gpu::SyncToken(),
      size, false /* is_overlay_candidate */);
  root->SetTransferableResource(
      resource, viz::SingleReleaseCallback::Create(std::move(callback)),
      gfx::Size(10, 10));
  compositor()->SetRootLayer(root.get());

  root->SetBounds(gfx::Rect(0, 0, 10, 10));
  root->SetVisible(true);
  WaitForCommit();

  gfx::Rect damaged_rect(0, 0, 5, 5);
  root->SchedulePaint(damaged_rect);
  EXPECT_EQ(damaged_rect, root->damaged_region_for_testing().bounds());
  WaitForCommit();
  EXPECT_TRUE(root->damaged_region_for_testing().IsEmpty());

  // The texture mailbox has a reference from an in-flight texture layer.
  // We clear the texture mailbox from the root layer and draw a new frame
  // to ensure that the texture mailbox is released.
  root->SetShowSolidColorContent();
  Draw();

  // Wait for texture mailbox release to avoid DCHECKs.
  run_loop.Run();
}

// Tests that in deferred paint request, the layer damage will be accumulated.
TEST_F(LayerWithNullDelegateTest, UpdateDamageInDeferredPaint) {
  gfx::Rect bound(gfx::Rect(500, 500));
  std::unique_ptr<Layer> root = CreateTextureRootLayer(bound);
  EXPECT_EQ(bound, root->damaged_region_for_testing());
  WaitForCommit();
  EXPECT_EQ(gfx::Rect(), root->damaged_region_for_testing());
  EXPECT_EQ(bound, LastInvalidation());

  // Deferring paint.
  root->AddDeferredPaintRequest();

  // During deferring paint request, invalid_rect will not be set to
  // cc_layer_->inputs_->update_rect, and the paint_region is empty.
  gfx::Rect bound1(gfx::Rect(100, 100));
  root->SchedulePaint(bound1);
  EXPECT_EQ(bound1, root->damaged_region_for_testing());
  root->SendDamagedRects();
  EXPECT_EQ(gfx::Rect(), root->cc_layer_for_testing()->update_rect());
  root->PaintContentsToDisplayList(
      cc::ContentLayerClient::PAINTING_BEHAVIOR_NORMAL);
  EXPECT_EQ(gfx::Rect(), LastInvalidation());

  // During deferring paint request, a new invalid_rect will be accumulated.
  gfx::Rect bound2(gfx::Rect(100, 200, 100, 100));
  gfx::Rect bound_union(bound1);
  bound_union.Union(bound2);
  root->SchedulePaint(bound2);
  EXPECT_EQ(bound_union, root->damaged_region_for_testing().bounds());
  root->SendDamagedRects();
  EXPECT_EQ(gfx::Rect(), root->cc_layer_for_testing()->update_rect());
  root->PaintContentsToDisplayList(
      cc::ContentLayerClient::PAINTING_BEHAVIOR_NORMAL);
  EXPECT_EQ(gfx::Rect(), LastInvalidation());

  // Remove deferring paint request.
  root->RemoveDeferredPaintRequest();

  // The invalidation region should be accumulated invalid_rect during deferred
  // paint, i.e. union of bound1 and bound2.
  root->SendDamagedRects();
  EXPECT_EQ(bound_union, root->cc_layer_for_testing()->update_rect());
  root->PaintContentsToDisplayList(
      cc::ContentLayerClient::PAINTING_BEHAVIOR_NORMAL);
  EXPECT_EQ(bound_union, LastInvalidation());
}

// Tests that Layer::SendDamagedRects() always recurses into its mask layer, if
// present, even if it shouldn't send its damaged regions itself.
TEST_F(LayerWithNullDelegateTest, AlwaysSendsMaskDamagedRects) {
  gfx::Rect bound(gfx::Rect(2, 2));
  std::unique_ptr<Layer> mask = CreateTextureLayer(bound);
  std::unique_ptr<Layer> root = CreateTextureRootLayer(bound);
  root->SetMaskLayer(mask.get());

  WaitForCommit();
  EXPECT_EQ(root->damaged_region_for_testing().bounds(), gfx::Rect());
  EXPECT_EQ(mask->damaged_region_for_testing().bounds(), gfx::Rect());

  const gfx::Rect invalid_rect(gfx::Size(1, 1));
  mask->SchedulePaint(invalid_rect);
  EXPECT_EQ(mask->damaged_region_for_testing().bounds(), invalid_rect);
  root->SendDamagedRects();
  EXPECT_EQ(mask->damaged_region_for_testing().bounds(), gfx::Rect());
}

// Verifies that when a layer is reflecting other layers, mirror counts of
// reflected layers are updated properly.
TEST_F(LayerWithNullDelegateTest, SetShowReflectedLayerSubtree) {
  std::unique_ptr<Layer> reflected_layer_1 = CreateLayer(LAYER_SOLID_COLOR);
  auto* reflected_layer_1_cc = reflected_layer_1->cc_layer_for_testing();

  std::unique_ptr<Layer> reflected_layer_2 = CreateLayer(LAYER_SOLID_COLOR);
  auto* reflected_layer_2_cc = reflected_layer_2->cc_layer_for_testing();

  std::unique_ptr<Layer> reflecting_layer = CreateLayer(LAYER_SOLID_COLOR);

  // Originally, mirror counts should be zero.
  auto* reflecting_layer_cc = reflecting_layer->mirror_layer_for_testing();
  EXPECT_EQ(nullptr, reflecting_layer_cc);
  EXPECT_EQ(0, reflected_layer_1_cc->mirror_count());
  EXPECT_EQ(0, reflected_layer_2_cc->mirror_count());

  // Mirror the first layer. Its mirror count should be increased.
  reflecting_layer->SetShowReflectedLayerSubtree(reflected_layer_1.get());
  reflecting_layer_cc = reflecting_layer->mirror_layer_for_testing();
  ASSERT_NE(nullptr, reflecting_layer_cc);
  EXPECT_EQ(reflecting_layer->cc_layer_for_testing(), reflecting_layer_cc);
  EXPECT_EQ(reflected_layer_1_cc, reflecting_layer_cc->mirrored_layer());
  EXPECT_EQ(1, reflected_layer_1_cc->mirror_count());
  EXPECT_EQ(0, reflected_layer_2_cc->mirror_count());

  // Mirror the second layer. Its mirror count should be increased, but mirror
  // count for the first mirrored layer should be set back to zero.
  reflecting_layer->SetShowReflectedLayerSubtree(reflected_layer_2.get());
  reflecting_layer_cc = reflecting_layer->mirror_layer_for_testing();
  ASSERT_NE(nullptr, reflecting_layer_cc);
  EXPECT_EQ(reflecting_layer->cc_layer_for_testing(), reflecting_layer_cc);
  EXPECT_EQ(reflected_layer_2_cc, reflecting_layer_cc->mirrored_layer());
  EXPECT_EQ(0, reflected_layer_1_cc->mirror_count());
  EXPECT_EQ(1, reflected_layer_2_cc->mirror_count());

  // Un-mirror the layer. All mirror counts should be set to zero.
  reflecting_layer->SetShowSolidColorContent();
  reflecting_layer_cc = reflecting_layer->mirror_layer_for_testing();
  EXPECT_EQ(nullptr, reflecting_layer_cc);
  EXPECT_EQ(0, reflected_layer_1_cc->mirror_count());
  EXPECT_EQ(0, reflected_layer_2_cc->mirror_count());
}

// Verifies that when a layer is reflecting another layer, its size matches the
// size of the reflected layer.
TEST_F(LayerWithNullDelegateTest, SetShowReflectedLayerSubtreeBounds) {
  const gfx::Rect reflected_bounds(0, 0, 50, 50);
  const gfx::Rect reflecting_bounds(0, 50, 10, 10);

  std::unique_ptr<Layer> reflected_layer = CreateLayer(LAYER_SOLID_COLOR);
  reflected_layer->SetBounds(reflected_bounds);

  std::unique_ptr<Layer> reflecting_layer = CreateLayer(LAYER_SOLID_COLOR);
  reflecting_layer->SetBounds(reflecting_bounds);

  EXPECT_EQ(reflecting_bounds, reflecting_layer->bounds());

  reflecting_layer->SetShowReflectedLayerSubtree(reflected_layer.get());
  EXPECT_EQ(reflecting_bounds.origin(), reflecting_layer->bounds().origin());
  EXPECT_EQ(reflected_bounds.size(), reflecting_layer->bounds().size());

  const gfx::Rect new_reflected_bounds(10, 10, 30, 30);
  reflected_layer->SetBounds(new_reflected_bounds);
  EXPECT_EQ(reflecting_bounds.origin(), reflecting_layer->bounds().origin());
  EXPECT_EQ(new_reflected_bounds.size(), reflecting_layer->bounds().size());

  // No crashes on reflected layer bounds change after the reflecting layer is
  // released.
  reflecting_layer = nullptr;
  reflected_layer->SetBounds(reflected_bounds);
  EXPECT_EQ(reflected_bounds, reflected_layer->bounds());
}

void ExpectRgba(int x, int y, SkColor expected_color, SkColor actual_color) {
  EXPECT_EQ(expected_color, actual_color)
      << "Pixel error at x=" << x << " y=" << y << "; "
      << "actual RGBA=("
      << SkColorGetR(actual_color) << ","
      << SkColorGetG(actual_color) << ","
      << SkColorGetB(actual_color) << ","
      << SkColorGetA(actual_color) << "); "
      << "expected RGBA=("
      << SkColorGetR(expected_color) << ","
      << SkColorGetG(expected_color) << ","
      << SkColorGetB(expected_color) << ","
      << SkColorGetA(expected_color) << ")";
}

// Checks that pixels are actually drawn to the screen with a read back.
TEST_P(LayerWithRealCompositorTest, DrawPixels) {
  gfx::Size viewport_size = GetCompositor()->size();

  // The window should be some non-trivial size but may not be exactly
  // 500x500 on all platforms/bots.
  EXPECT_GE(viewport_size.width(), 200);
  EXPECT_GE(viewport_size.height(), 200);

  int blue_height = 10;

  std::unique_ptr<Layer> layer =
      CreateColorLayer(SK_ColorRED, gfx::Rect(viewport_size));
  std::unique_ptr<Layer> layer2 = CreateColorLayer(
      SK_ColorBLUE, gfx::Rect(0, 0, viewport_size.width(), blue_height));

  layer->Add(layer2.get());

  DrawTree(layer.get());

  SkBitmap bitmap;
  ReadPixels(&bitmap, gfx::Rect(viewport_size));
  ASSERT_FALSE(bitmap.empty());

  for (int x = 0; x < viewport_size.width(); x++) {
    for (int y = 0; y < viewport_size.height(); y++) {
      SkColor actual_color = bitmap.getColor(x, y);
      SkColor expected_color = y < blue_height ? SK_ColorBLUE : SK_ColorRED;
      ExpectRgba(x, y, expected_color, actual_color);
    }
  }
}

// Checks that drawing a layer with transparent pixels is blended correctly
// with the lower layer.
TEST_P(LayerWithRealCompositorTest, DrawAlphaBlendedPixels) {
  gfx::Size viewport_size = GetCompositor()->size();

  int test_size = 200;
  EXPECT_GE(viewport_size.width(), test_size);
  EXPECT_GE(viewport_size.height(), test_size);

  // Blue with a wee bit of transparency.
  SkColor blue_with_alpha = SkColorSetARGB(40, 10, 20, 200);
  SkColor blend_color = SkColorSetARGB(255, 216, 3, 32);

  std::unique_ptr<Layer> background_layer =
      CreateColorLayer(SK_ColorRED, gfx::Rect(viewport_size));
  std::unique_ptr<Layer> foreground_layer =
      CreateColorLayer(blue_with_alpha, gfx::Rect(viewport_size));

  // This must be set to false for layers with alpha to be blended correctly.
  foreground_layer->SetFillsBoundsOpaquely(false);

  background_layer->Add(foreground_layer.get());
  DrawTree(background_layer.get());

  SkBitmap bitmap;
  ReadPixels(&bitmap, gfx::Rect(viewport_size));
  ASSERT_FALSE(bitmap.empty());

  SkBitmap original_bitmap;
  original_bitmap.allocPixels(bitmap.info());
  original_bitmap.eraseColor(blend_color);

  cc::FuzzyPixelOffByOneComparator comparator(false);
  EXPECT_TRUE(comparator.Compare(bitmap, original_bitmap));
}

// Checks that using the AlphaShape filter applied to a layer with
// transparency, alpha-blends properly with the layer below.
TEST_P(LayerWithRealCompositorTest, DrawAlphaThresholdFilterPixels) {
  gfx::Size viewport_size = GetCompositor()->size();

  int test_size = 200;
  EXPECT_GE(viewport_size.width(), test_size);
  EXPECT_GE(viewport_size.height(), test_size);

  int blue_height = 10;
  SkColor blue_with_alpha = SkColorSetARGB(40, 0, 0, 255);
  SkColor blend_color = SkColorSetARGB(255, 215, 0, 40);

  std::unique_ptr<Layer> background_layer =
      CreateColorLayer(SK_ColorRED, gfx::Rect(viewport_size));
  std::unique_ptr<Layer> foreground_layer =
      CreateColorLayer(blue_with_alpha, gfx::Rect(viewport_size));

  // Add a shape to restrict the visible part of the layer.
  auto shape = std::make_unique<Layer::ShapeRects>();
  shape->emplace_back(0, 0, viewport_size.width(), blue_height);
  foreground_layer->SetAlphaShape(std::move(shape));

  foreground_layer->SetFillsBoundsOpaquely(false);

  background_layer->Add(foreground_layer.get());
  DrawTree(background_layer.get());

  SkBitmap bitmap;
  ReadPixels(&bitmap, gfx::Rect(viewport_size));
  ASSERT_FALSE(bitmap.empty());

  for (int x = 0; x < test_size; x++) {
    for (int y = 0; y < test_size; y++) {
      SkColor actual_color = bitmap.getColor(x, y);
      ExpectRgba(x, y, actual_color,
                 y < blue_height ? blend_color : SK_ColorRED);
    }
  }
}

// Checks the logic around Compositor::SetRootLayer and Layer::SetCompositor.
TEST_P(LayerWithRealCompositorTest, SetRootLayer) {
  Compositor* compositor = GetCompositor();
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 400, 400));
  std::unique_ptr<Layer> l2 =
      CreateColorLayer(SK_ColorBLUE, gfx::Rect(10, 10, 350, 350));

  EXPECT_EQ(NULL, l1->GetCompositor());
  EXPECT_EQ(NULL, l2->GetCompositor());

  compositor->SetRootLayer(l1.get());
  EXPECT_EQ(compositor, l1->GetCompositor());

  l1->Add(l2.get());
  EXPECT_EQ(compositor, l2->GetCompositor());

  l1->Remove(l2.get());
  EXPECT_EQ(NULL, l2->GetCompositor());

  l1->Add(l2.get());
  EXPECT_EQ(compositor, l2->GetCompositor());

  compositor->SetRootLayer(NULL);
  EXPECT_EQ(NULL, l1->GetCompositor());
  EXPECT_EQ(NULL, l2->GetCompositor());
}

// Checks that compositor observers are notified when:
// - DrawTree is called,
// - After ScheduleDraw is called, or
// - Whenever SetBounds, SetOpacity or SetTransform are called.
// TODO(vollick): could be reorganized into compositor_unittest.cc
// Flaky on Windows. See https://crbug.com/784563.
// Flaky on Linux tsan. See https://crbug.com/834026.
#if defined(OS_WIN) || defined(OS_LINUX)
#define MAYBE_CompositorObservers DISABLED_CompositorObservers
#else
#define MAYBE_CompositorObservers CompositorObservers
#endif
TEST_P(LayerWithRealCompositorTest, MAYBE_CompositorObservers) {
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(20, 20, 400, 400));
  std::unique_ptr<Layer> l2 =
      CreateColorLayer(SK_ColorBLUE, gfx::Rect(10, 10, 350, 350));
  l1->Add(l2.get());
  TestCompositorObserver observer;
  GetCompositor()->AddObserver(&observer);

  // Explicitly called DrawTree should cause the observers to be notified.
  // NOTE: this call to DrawTree sets l1 to be the compositor's root layer.
  DrawTree(l1.get());
  EXPECT_TRUE(observer.notified());

  // ScheduleDraw without any visible change should cause a commit.
  observer.Reset();
  l1->ScheduleDraw();
  WaitForCommit();
  EXPECT_TRUE(observer.committed());

  // Moving, but not resizing, a layer should alert the observers.
  observer.Reset();
  l2->SetBounds(gfx::Rect(0, 0, 350, 350));
  WaitForSwap();
  EXPECT_TRUE(observer.notified());

  // So should resizing a layer.
  observer.Reset();
  l2->SetBounds(gfx::Rect(0, 0, 400, 400));
  WaitForSwap();
  EXPECT_TRUE(observer.notified());

  // Opacity changes should alert the observers.
  observer.Reset();
  l2->SetOpacity(0.5f);
  WaitForSwap();
  EXPECT_TRUE(observer.notified());

  // So should setting the opacity back.
  observer.Reset();
  l2->SetOpacity(1.0f);
  WaitForSwap();
  EXPECT_TRUE(observer.notified());

  // Setting the transform of a layer should alert the observers.
  observer.Reset();
  gfx::Transform transform;
  transform.Translate(200.0, 200.0);
  transform.Rotate(90.0);
  transform.Translate(-200.0, -200.0);
  l2->SetTransform(transform);
  WaitForSwap();
  EXPECT_TRUE(observer.notified());

  GetCompositor()->RemoveObserver(&observer);

  // Opacity changes should no longer alert the removed observer.
  observer.Reset();
  l2->SetOpacity(0.5f);
  WaitForSwap();

  EXPECT_FALSE(observer.notified());
}

// Checks that modifying the hierarchy correctly affects final composite.
TEST_P(LayerWithRealCompositorTest, ModifyHierarchy) {
  viz::ParentLocalSurfaceIdAllocator allocator;
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.0f, gfx::Size(50, 50), allocator.GetCurrentLocalSurfaceIdAllocation());

  // l0
  //  +-l11
  //  | +-l21
  //  +-l12
  std::unique_ptr<Layer> l0 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(0, 0, 50, 50));
  std::unique_ptr<Layer> l11 =
      CreateColorLayer(SK_ColorGREEN, gfx::Rect(0, 0, 25, 25));
  std::unique_ptr<Layer> l21 =
      CreateColorLayer(SK_ColorMAGENTA, gfx::Rect(0, 0, 15, 15));
  std::unique_ptr<Layer> l12 =
      CreateColorLayer(SK_ColorBLUE, gfx::Rect(10, 10, 25, 25));

  base::FilePath ref_img1 = test_data_dir().AppendASCII("ModifyHierarchy1.png");
  base::FilePath ref_img2 = test_data_dir().AppendASCII("ModifyHierarchy2.png");
  SkBitmap bitmap;

  l0->Add(l11.get());
  l11->Add(l21.get());
  l0->Add(l12.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  // WritePNGFile(bitmap, ref_img1);
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img1, cc::ExactPixelComparator(true)));

  l0->StackAtTop(l11.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  // WritePNGFile(bitmap, ref_img2);
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img2, cc::ExactPixelComparator(true)));

  // should restore to original configuration
  l0->StackAbove(l12.get(), l11.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img1, cc::ExactPixelComparator(true)));

  // l11 back to front
  l0->StackAtTop(l11.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img2, cc::ExactPixelComparator(true)));

  // should restore to original configuration
  l0->StackAbove(l12.get(), l11.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img1, cc::ExactPixelComparator(true)));

  // l11 back to front
  l0->StackAbove(l11.get(), l12.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img2, cc::ExactPixelComparator(true)));
}

// Checks that basic background blur is working.
TEST_P(LayerWithRealCompositorTest, BackgroundBlur) {
  viz::ParentLocalSurfaceIdAllocator allocator;
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.0f, gfx::Size(200, 200),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  // l0
  //  +-l1
  //  +-l2
  std::unique_ptr<Layer> l0 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(0, 0, 200, 200));
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorGREEN, gfx::Rect(100, 100, 100, 100));
  SkColor blue_with_alpha = SkColorSetARGB(40, 10, 20, 200);
  std::unique_ptr<Layer> l2 =
      CreateColorLayer(blue_with_alpha, gfx::Rect(50, 50, 100, 100));
  l2->SetFillsBoundsOpaquely(false);
  l2->SetBackgroundBlur(15);

  base::FilePath ref_img1 = test_data_dir().AppendASCII("BackgroundBlur1.png");
  base::FilePath ref_img2 = test_data_dir().AppendASCII("BackgroundBlur2.png");
  SkBitmap bitmap;

  // 25% of image can have up to a difference of 3.
  cc::FuzzyPixelComparator fuzzy_comparator(true, 25.f, 0.0f, 3.f, 3, 0);

  l0->Add(l1.get());
  l0->Add(l2.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  // WritePNGFile(bitmap, ref_img1, false);
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img1, fuzzy_comparator));

  l0->StackAtTop(l1.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  // WritePNGFile(bitmap, ref_img2, false);
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img2, fuzzy_comparator));
}

// Checks that background blur bounds rect gets properly updated when device
// scale changes.
TEST_P(LayerWithRealCompositorTest, BackgroundBlurChangeDeviceScale) {
  viz::ParentLocalSurfaceIdAllocator allocator;
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.0f, gfx::Size(200, 200),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  // l0
  //  +-l1
  //  +-l2
  std::unique_ptr<Layer> l0 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(0, 0, 200, 200));
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorGREEN, gfx::Rect(100, 100, 100, 100));
  SkColor blue_with_alpha = SkColorSetARGB(40, 10, 20, 200);
  std::unique_ptr<Layer> l2 =
      CreateColorLayer(blue_with_alpha, gfx::Rect(50, 50, 100, 100));
  l2->SetFillsBoundsOpaquely(false);
  l2->SetBackgroundBlur(15);

  base::FilePath ref_img1 = test_data_dir().AppendASCII("BackgroundBlur1.png");
  base::FilePath ref_img2 =
      test_data_dir().AppendASCII("BackgroundBlur1_zoom.png");
  SkBitmap bitmap;

  // 25% of image can have up to a difference of 3.
  cc::FuzzyPixelComparator fuzzy_comparator(true, 25.f, 0.0f, 3.f, 3, 0);

  l0->Add(l1.get());
  l0->Add(l2.get());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  // See LayerWithRealCompositorTest.BackgroundBlur test to rewrite this
  // baseline.
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img1, fuzzy_comparator));

  allocator.GenerateId();
  // Now change the scale, and make sure the bounds are still correct.
  GetCompositor()->SetScaleAndSize(
      2.0f, gfx::Size(200, 200),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  DrawTree(l0.get());
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  // WritePNGFile(bitmap, ref_img2, false);
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img2, fuzzy_comparator));
}

// Opacity is rendered correctly.
// Checks that modifying the hierarchy correctly affects final composite.
TEST_P(LayerWithRealCompositorTest, Opacity) {
  viz::ParentLocalSurfaceIdAllocator allocator;
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.0f, gfx::Size(50, 50), allocator.GetCurrentLocalSurfaceIdAllocation());

  // l0
  //  +-l11
  std::unique_ptr<Layer> l0 =
      CreateColorLayer(SK_ColorRED, gfx::Rect(0, 0, 50, 50));
  std::unique_ptr<Layer> l11 =
      CreateColorLayer(SK_ColorGREEN, gfx::Rect(0, 0, 25, 25));

  base::FilePath ref_img = test_data_dir().AppendASCII("Opacity.png");

  l11->SetOpacity(0.75);
  l0->Add(l11.get());
  DrawTree(l0.get());
  SkBitmap bitmap;
  ReadPixels(&bitmap);
  ASSERT_FALSE(bitmap.empty());
  // WritePNGFile(bitmap, ref_img);
  EXPECT_TRUE(MatchesPNGFile(bitmap, ref_img, cc::ExactPixelComparator(true)));
}

namespace {

class SchedulePaintLayerDelegate : public LayerDelegate {
 public:
  SchedulePaintLayerDelegate() : paint_count_(0), layer_(NULL) {}

  ~SchedulePaintLayerDelegate() override {}

  void set_layer(Layer* layer) {
    layer_ = layer;
    layer_->set_delegate(this);
  }

  void SetSchedulePaintRect(const gfx::Rect& rect) {
    schedule_paint_rect_ = rect;
  }

  int GetPaintCountAndClear() {
    int value = paint_count_;
    paint_count_ = 0;
    return value;
  }

  const gfx::Rect& last_clip_rect() const { return last_clip_rect_; }

 private:
  // Overridden from LayerDelegate:
  void OnPaintLayer(const ui::PaintContext& context) override {
    paint_count_++;
    if (!schedule_paint_rect_.IsEmpty()) {
      layer_->SchedulePaint(schedule_paint_rect_);
      schedule_paint_rect_ = gfx::Rect();
    }
    last_clip_rect_ = context.InvalidationForTesting();
  }

  void OnDeviceScaleFactorChanged(float old_device_scale_factor,
                                  float new_device_scale_factor) override {}

  int paint_count_;
  Layer* layer_;
  gfx::Rect schedule_paint_rect_;
  gfx::Rect last_clip_rect_;

  DISALLOW_COPY_AND_ASSIGN(SchedulePaintLayerDelegate);
};

}  // namespace

// Verifies that if SchedulePaint is invoked during painting the layer is still
// marked dirty.
TEST_F(LayerWithDelegateTest, SchedulePaintFromOnPaintLayer) {
  std::unique_ptr<Layer> root =
      CreateColorLayer(SK_ColorRED, gfx::Rect(0, 0, 500, 500));
  SchedulePaintLayerDelegate child_delegate;
  std::unique_ptr<Layer> child =
      CreateColorLayer(SK_ColorBLUE, gfx::Rect(0, 0, 200, 200));
  child_delegate.set_layer(child.get());

  root->Add(child.get());

  SchedulePaintForLayer(root.get());
  DrawTree(root.get());
  child->SchedulePaint(gfx::Rect(0, 0, 20, 20));
  EXPECT_EQ(1, child_delegate.GetPaintCountAndClear());

  // Set a rect so that when OnPaintLayer() is invoked SchedulePaint is invoked
  // again.
  child_delegate.SetSchedulePaintRect(gfx::Rect(10, 10, 30, 30));
  WaitForCommit();
  EXPECT_EQ(1, child_delegate.GetPaintCountAndClear());

  // Because SchedulePaint() was invoked from OnPaintLayer() |child| should
  // still need to be painted.
  WaitForCommit();
  EXPECT_EQ(1, child_delegate.GetPaintCountAndClear());
  EXPECT_TRUE(child_delegate.last_clip_rect().Contains(
                  gfx::Rect(10, 10, 30, 30)));
}

TEST_P(LayerWithRealCompositorTest, ScaleUpDown) {
  std::unique_ptr<Layer> root =
      CreateColorLayer(SK_ColorWHITE, gfx::Rect(10, 20, 200, 220));
  TestLayerDelegate root_delegate;
  root_delegate.AddColor(SK_ColorWHITE);
  root->set_delegate(&root_delegate);
  root_delegate.set_layer_bounds(root->bounds());

  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorWHITE, gfx::Rect(10, 20, 140, 180));
  TestLayerDelegate l1_delegate;
  l1_delegate.AddColor(SK_ColorWHITE);
  l1->set_delegate(&l1_delegate);
  l1_delegate.set_layer_bounds(l1->bounds());

  viz::ParentLocalSurfaceIdAllocator allocator;
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.0f, gfx::Size(500, 500),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  GetCompositor()->SetRootLayer(root.get());
  root->Add(l1.get());
  WaitForDraw();

  EXPECT_EQ("10,20 200x220", root->bounds().ToString());
  EXPECT_EQ("10,20 140x180", l1->bounds().ToString());
  gfx::Size cc_bounds_size = root->cc_layer_for_testing()->bounds();
  EXPECT_EQ("200x220", cc_bounds_size.ToString());
  cc_bounds_size = l1->cc_layer_for_testing()->bounds();
  EXPECT_EQ("140x180", cc_bounds_size.ToString());
  // No scale change, so no scale notification.
  EXPECT_EQ(0.0f, root_delegate.device_scale_factor());
  EXPECT_EQ(0.0f, l1_delegate.device_scale_factor());

  // Scale up to 2.0. Changing scale doesn't change the bounds in DIP.
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      2.0f, gfx::Size(500, 500),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  EXPECT_EQ("10,20 200x220", root->bounds().ToString());
  EXPECT_EQ("10,20 140x180", l1->bounds().ToString());
  // CC layer should still match the UI layer bounds.
  cc_bounds_size = root->cc_layer_for_testing()->bounds();
  EXPECT_EQ("200x220", cc_bounds_size.ToString());
  cc_bounds_size = l1->cc_layer_for_testing()->bounds();
  EXPECT_EQ("140x180", cc_bounds_size.ToString());
  // New scale factor must have been notified. Make sure painting happens at
  // right scale.
  EXPECT_EQ(2.0f, root_delegate.device_scale_factor());
  EXPECT_EQ(2.0f, l1_delegate.device_scale_factor());

  // Scale down back to 1.0f.
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.0f, gfx::Size(500, 500),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  EXPECT_EQ("10,20 200x220", root->bounds().ToString());
  EXPECT_EQ("10,20 140x180", l1->bounds().ToString());
  // CC layer should still match the UI layer bounds.
  cc_bounds_size = root->cc_layer_for_testing()->bounds();
  EXPECT_EQ("200x220", cc_bounds_size.ToString());
  cc_bounds_size = l1->cc_layer_for_testing()->bounds();
  EXPECT_EQ("140x180", cc_bounds_size.ToString());
  // New scale factor must have been notified. Make sure painting happens at
  // right scale.
  EXPECT_EQ(1.0f, root_delegate.device_scale_factor());
  EXPECT_EQ(1.0f, l1_delegate.device_scale_factor());

  root_delegate.reset();
  l1_delegate.reset();
  // Just changing the size shouldn't notify the scale change nor
  // trigger repaint.
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.0f, gfx::Size(1000, 1000),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  // No scale change, so no scale notification.
  EXPECT_EQ(0.0f, root_delegate.device_scale_factor());
  EXPECT_EQ(0.0f, l1_delegate.device_scale_factor());
}

TEST_P(LayerWithRealCompositorTest, ScaleReparent) {
  viz::ParentLocalSurfaceIdAllocator allocator;
  allocator.GenerateId();
  std::unique_ptr<Layer> root =
      CreateColorLayer(SK_ColorWHITE, gfx::Rect(10, 20, 200, 220));
  std::unique_ptr<Layer> l1 =
      CreateColorLayer(SK_ColorWHITE, gfx::Rect(10, 20, 140, 180));
  TestLayerDelegate l1_delegate;
  l1_delegate.AddColor(SK_ColorWHITE);
  l1->set_delegate(&l1_delegate);
  l1_delegate.set_layer_bounds(l1->bounds());

  GetCompositor()->SetScaleAndSize(
      1.0f, gfx::Size(500, 500),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  GetCompositor()->SetRootLayer(root.get());

  root->Add(l1.get());
  EXPECT_EQ("10,20 140x180", l1->bounds().ToString());
  gfx::Size cc_bounds_size = l1->cc_layer_for_testing()->bounds();
  EXPECT_EQ("140x180", cc_bounds_size.ToString());
  EXPECT_EQ(0.0f, l1_delegate.device_scale_factor());

  // Remove l1 from root and change the scale.
  root->Remove(l1.get());
  EXPECT_EQ(NULL, l1->parent());
  EXPECT_EQ(NULL, l1->GetCompositor());
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      2.0f, gfx::Size(500, 500),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  // Sanity check on root and l1.
  EXPECT_EQ("10,20 200x220", root->bounds().ToString());
  cc_bounds_size = l1->cc_layer_for_testing()->bounds();
  EXPECT_EQ("140x180", cc_bounds_size.ToString());

  root->Add(l1.get());
  EXPECT_EQ("10,20 140x180", l1->bounds().ToString());
  cc_bounds_size = l1->cc_layer_for_testing()->bounds();
  EXPECT_EQ("140x180", cc_bounds_size.ToString());
  EXPECT_EQ(2.0f, l1_delegate.device_scale_factor());
}

// Verifies that when changing bounds on a layer that is invisible, and then
// made visible, the right thing happens:
// - if just a move, then no painting should happen.
// - if a resize, the layer should be repainted.
TEST_F(LayerWithDelegateTest, SetBoundsWhenInvisible) {
  std::unique_ptr<Layer> root =
      CreateNoTextureLayer(gfx::Rect(0, 0, 1000, 1000));

  std::unique_ptr<Layer> child = CreateLayer(LAYER_TEXTURED);
  child->SetBounds(gfx::Rect(0, 0, 500, 500));
  DrawTreeLayerDelegate delegate(child->bounds());
  child->set_delegate(&delegate);
  root->Add(child.get());

  // Paint once for initial damage.
  child->SetVisible(true);
  DrawTree(root.get());

  // Reset into invisible state.
  child->SetVisible(false);
  DrawTree(root.get());
  delegate.Reset();

  // Move layer.
  child->SetBounds(gfx::Rect(200, 200, 500, 500));
  child->SetVisible(true);
  DrawTree(root.get());
  EXPECT_FALSE(delegate.painted());

  // Reset into invisible state.
  child->SetVisible(false);
  DrawTree(root.get());
  delegate.Reset();

  // Resize layer.
  child->SetBounds(gfx::Rect(200, 200, 400, 400));
  child->SetVisible(true);
  DrawTree(root.get());
  EXPECT_TRUE(delegate.painted());
}

TEST_F(LayerWithDelegateTest, ExternalContent) {
  std::unique_ptr<Layer> root =
      CreateNoTextureLayer(gfx::Rect(0, 0, 1000, 1000));
  std::unique_ptr<Layer> child = CreateLayer(LAYER_SOLID_COLOR);

  child->SetBounds(gfx::Rect(0, 0, 10, 10));
  child->SetVisible(true);
  root->Add(child.get());

  // The layer is already showing solid color content, so the cc layer won't
  // change.
  scoped_refptr<cc::Layer> before = child->cc_layer_for_testing();

  child->SetShowSolidColorContent();
  EXPECT_TRUE(child->cc_layer_for_testing());
  EXPECT_EQ(before.get(), child->cc_layer_for_testing());

  // Showing surface content changes the underlying cc layer.
  viz::FrameSinkId frame_sink_id(1u, 1u);
  viz::ParentLocalSurfaceIdAllocator allocator;
  before = child->cc_layer_for_testing();
  allocator.GenerateId();
  child->SetShowSurface(
      viz::SurfaceId(
          frame_sink_id,
          allocator.GetCurrentLocalSurfaceIdAllocation().local_surface_id()),
      gfx::Size(10, 10), SK_ColorWHITE,
      cc::DeadlinePolicy::UseDefaultDeadline(), false);
  scoped_refptr<cc::Layer> after = child->cc_layer_for_testing();
  const auto* surface = static_cast<cc::SurfaceLayer*>(after.get());
  EXPECT_TRUE(after.get());
  EXPECT_NE(before.get(), after.get());
  EXPECT_EQ(base::nullopt, surface->deadline_in_frames());

  allocator.GenerateId();
  child->SetShowSurface(
      viz::SurfaceId(
          frame_sink_id,
          allocator.GetCurrentLocalSurfaceIdAllocation().local_surface_id()),
      gfx::Size(10, 10), SK_ColorWHITE,
      cc::DeadlinePolicy::UseSpecifiedDeadline(4u), false);
  EXPECT_EQ(4u, surface->deadline_in_frames());
}

TEST_F(LayerWithDelegateTest, ExternalContentMirroring) {
  std::unique_ptr<Layer> layer = CreateLayer(LAYER_SOLID_COLOR);

  viz::SurfaceId surface_id(
      viz::FrameSinkId(0, 1),
      viz::LocalSurfaceId(2, base::UnguessableToken::Create()));
  layer->SetShowSurface(surface_id, gfx::Size(10, 10), SK_ColorWHITE,
                        cc::DeadlinePolicy::UseDefaultDeadline(), false);

  const auto mirror = layer->Mirror();
  auto* const cc_layer = mirror->cc_layer_for_testing();
  const auto* surface = static_cast<cc::SurfaceLayer*>(cc_layer);

  // Mirroring preserves surface state.
  EXPECT_EQ(surface_id, surface->surface_id());

  surface_id =
      viz::SurfaceId(viz::FrameSinkId(1, 2),
                     viz::LocalSurfaceId(3, base::UnguessableToken::Create()));
  layer->SetShowSurface(surface_id, gfx::Size(20, 20), SK_ColorWHITE,
                        cc::DeadlinePolicy::UseDefaultDeadline(), false);

  // The mirror should continue to use the same cc_layer.
  EXPECT_EQ(cc_layer, mirror->cc_layer_for_testing());
  layer->SetShowSurface(surface_id, gfx::Size(20, 20), SK_ColorWHITE,
                        cc::DeadlinePolicy::UseDefaultDeadline(), false);

  // Surface updates propagate to the mirror.
  EXPECT_EQ(surface_id, surface->surface_id());
}

TEST_F(LayerWithDelegateTest, TransferableResourceMirroring) {
  std::unique_ptr<Layer> layer = CreateLayer(LAYER_SOLID_COLOR);

  constexpr gfx::Size size(64, 64);
  auto resource = viz::TransferableResource::MakeGL(
      gpu::Mailbox::Generate(), GL_LINEAR, GL_TEXTURE_2D, gpu::SyncToken(),
      size, false /* is_overlay_candidate */);
  bool release_callback_run = false;

  layer->SetTransferableResource(
      resource,
      viz::SingleReleaseCallback::Create(
          base::BindOnce(ReturnMailbox, &release_callback_run)),
      gfx::Size(10, 10));
  EXPECT_FALSE(release_callback_run);
  EXPECT_TRUE(layer->has_external_content());

  auto mirror = layer->Mirror();
  EXPECT_TRUE(mirror->has_external_content());

  // Clearing the resource on a mirror layer should not release the source layer
  // resource.
  mirror.reset();
  EXPECT_FALSE(release_callback_run);

  mirror = layer->Mirror();
  EXPECT_TRUE(mirror->has_external_content());

  // Clearing the transferable resource on the source layer should clear it from
  // the mirror layer as well.
  layer->SetShowSolidColorContent();
  EXPECT_TRUE(release_callback_run);
  EXPECT_FALSE(layer->has_external_content());
  EXPECT_FALSE(mirror->has_external_content());

  resource = viz::TransferableResource::MakeGL(
      gpu::Mailbox::Generate(), GL_LINEAR, GL_TEXTURE_2D, gpu::SyncToken(),
      size, false /* is_overlay_candidate */);
  release_callback_run = false;

  // Setting a transferable resource on the source layer should set it on the
  // mirror layers as well.
  layer->SetTransferableResource(
      resource,
      viz::SingleReleaseCallback::Create(
          base::BindOnce(ReturnMailbox, &release_callback_run)),
      gfx::Size(10, 10));
  EXPECT_FALSE(release_callback_run);
  EXPECT_TRUE(layer->has_external_content());
  EXPECT_TRUE(mirror->has_external_content());

  layer.reset();
}

// Verifies that layer filters still attached after changing implementation
// layer.
TEST_F(LayerWithDelegateTest, LayerFiltersSurvival) {
  std::unique_ptr<Layer> layer = CreateLayer(LAYER_TEXTURED);
  layer->SetBounds(gfx::Rect(0, 0, 10, 10));
  EXPECT_TRUE(layer->cc_layer_for_testing());
  EXPECT_EQ(0u, layer->cc_layer_for_testing()->filters().size());

  layer->SetLayerGrayscale(0.5f);
  EXPECT_EQ(layer->layer_grayscale(), 0.5f);
  EXPECT_EQ(1u, layer->cc_layer_for_testing()->filters().size());

  // Showing surface content changes the underlying cc layer.
  scoped_refptr<cc::Layer> before = layer->cc_layer_for_testing();
  layer->SetShowSurface(viz::SurfaceId(), gfx::Size(10, 10), SK_ColorWHITE,
                        cc::DeadlinePolicy::UseDefaultDeadline(), false);
  EXPECT_EQ(layer->layer_grayscale(), 0.5f);
  EXPECT_TRUE(layer->cc_layer_for_testing());
  EXPECT_NE(before.get(), layer->cc_layer_for_testing());
  EXPECT_EQ(1u, layer->cc_layer_for_testing()->filters().size());
}

// Tests Layer::AddThreadedAnimation and Layer::RemoveThreadedAnimation.
TEST_P(LayerWithRealCompositorTest, AddRemoveThreadedAnimations) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> l1 = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> l2 = CreateLayer(LAYER_TEXTURED);

  l1->SetAnimator(LayerAnimator::CreateImplicitAnimator());
  l2->SetAnimator(LayerAnimator::CreateImplicitAnimator());

  auto* animation1 = l1->GetAnimator()->GetAnimationForTesting();
  auto* animation2 = l2->GetAnimator()->GetAnimationForTesting();

  EXPECT_FALSE(animation1->keyframe_effect()->has_any_keyframe_model());

  // Trigger a threaded animation.
  l1->SetOpacity(0.5f);

  EXPECT_TRUE(animation1->keyframe_effect()->has_any_keyframe_model());

  // Ensure we can remove a pending threaded animation.
  l1->GetAnimator()->StopAnimating();

  EXPECT_FALSE(animation1->keyframe_effect()->has_any_keyframe_model());

  // Trigger another threaded animation.
  l1->SetOpacity(0.2f);

  EXPECT_TRUE(animation1->keyframe_effect()->has_any_keyframe_model());

  root->Add(l1.get());
  GetCompositor()->SetRootLayer(root.get());

  // Now l1 is part of a tree.
  EXPECT_TRUE(animation1->keyframe_effect()->has_any_keyframe_model());

  l1->SetOpacity(0.1f);
  // IMMEDIATELY_SET_NEW_TARGET is a default preemption strategy for conflicting
  // animations.
  EXPECT_FALSE(animation1->keyframe_effect()->has_any_keyframe_model());

  // Adding a layer to an existing tree.
  l2->SetOpacity(0.5f);
  EXPECT_TRUE(animation2->keyframe_effect()->has_any_keyframe_model());

  l1->Add(l2.get());
  EXPECT_TRUE(animation2->keyframe_effect()->has_any_keyframe_model());
}

// Tests that in-progress threaded animations complete when a Layer's
// cc::Layer changes.
TEST_P(LayerWithRealCompositorTest, SwitchCCLayerAnimations) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> l1 = CreateLayer(LAYER_TEXTURED);
  GetCompositor()->SetRootLayer(root.get());
  root->Add(l1.get());

  l1->SetAnimator(LayerAnimator::CreateImplicitAnimator());

  EXPECT_FLOAT_EQ(l1->opacity(), 1.0f);

  // Trigger a threaded animation.
  l1->SetOpacity(0.5f);

  // Change l1's cc::Layer.
  l1->SwitchCCLayerForTest();

  // Ensure that the opacity animation completed.
  EXPECT_FLOAT_EQ(l1->opacity(), 0.5f);
}

// Tests that when a LAYER_SOLID_COLOR has its CC layer switched, that
// opaqueness and color set while not animating, are maintained.
TEST_P(LayerWithRealCompositorTest, SwitchCCLayerSolidColorNotAnimating) {
  SkColor transparent = SK_ColorTRANSPARENT;
  std::unique_ptr<Layer> root = CreateLayer(LAYER_SOLID_COLOR);
  GetCompositor()->SetRootLayer(root.get());
  root->SetFillsBoundsOpaquely(false);
  root->SetColor(transparent);

  EXPECT_FALSE(root->fills_bounds_opaquely());
  EXPECT_FALSE(
      root->GetAnimator()->IsAnimatingProperty(LayerAnimationElement::COLOR));
  EXPECT_EQ(transparent, root->background_color());
  EXPECT_EQ(transparent, root->GetTargetColor());

  // Changing the underlying layer should not affect targets.
  root->SwitchCCLayerForTest();

  EXPECT_FALSE(root->fills_bounds_opaquely());
  EXPECT_FALSE(
      root->GetAnimator()->IsAnimatingProperty(LayerAnimationElement::COLOR));
  EXPECT_EQ(transparent, root->background_color());
  EXPECT_EQ(transparent, root->GetTargetColor());
}

// Tests that when a LAYER_SOLID_COLOR has its CC layer switched during an
// animation of its opaquness and color, that both the current values, and the
// targets are maintained.
TEST_P(LayerWithRealCompositorTest, SwitchCCLayerSolidColorWhileAnimating) {
  SkColor transparent = SK_ColorTRANSPARENT;
  std::unique_ptr<Layer> root = CreateLayer(LAYER_SOLID_COLOR);
  GetCompositor()->SetRootLayer(root.get());
  root->SetColor(SK_ColorBLACK);

  EXPECT_TRUE(root->fills_bounds_opaquely());
  EXPECT_EQ(SK_ColorBLACK, root->GetTargetColor());

  auto long_duration_animation =
      std::make_unique<ui::ScopedAnimationDurationScaleMode>(
          ui::ScopedAnimationDurationScaleMode::SLOW_DURATION);
  {
    ui::ScopedLayerAnimationSettings animation(root->GetAnimator());
    animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(1000));
    root->SetFillsBoundsOpaquely(false);
    root->SetColor(transparent);
  }

  EXPECT_TRUE(root->fills_bounds_opaquely());
  EXPECT_TRUE(
      root->GetAnimator()->IsAnimatingProperty(LayerAnimationElement::COLOR));
  EXPECT_EQ(SK_ColorBLACK, root->background_color());
  EXPECT_EQ(transparent, root->GetTargetColor());

  // Changing the underlying layer should not affect targets.
  root->SwitchCCLayerForTest();

  EXPECT_TRUE(root->fills_bounds_opaquely());
  EXPECT_TRUE(
      root->GetAnimator()->IsAnimatingProperty(LayerAnimationElement::COLOR));
  EXPECT_EQ(SK_ColorBLACK, root->background_color());
  EXPECT_EQ(transparent, root->GetTargetColor());

  // End all animations.
  root->GetAnimator()->StopAnimating();
  EXPECT_FALSE(root->fills_bounds_opaquely());
  EXPECT_FALSE(
      root->GetAnimator()->IsAnimatingProperty(LayerAnimationElement::COLOR));
  EXPECT_EQ(transparent, root->background_color());
  EXPECT_EQ(transparent, root->GetTargetColor());
}

// Tests that when a layer with cache_render_surface flag has its CC layer
// switched, that the cache_render_surface flag is maintained.
TEST_P(LayerWithRealCompositorTest, SwitchCCLayerCacheRenderSurface) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> l1 = CreateLayer(LAYER_TEXTURED);
  GetCompositor()->SetRootLayer(root.get());
  root->Add(l1.get());

  l1->AddCacheRenderSurfaceRequest();

  // Change l1's cc::Layer.
  l1->SwitchCCLayerForTest();

  // Ensure that the cache_render_surface flag is maintained.
  EXPECT_TRUE(l1->cc_layer_for_testing()->cache_render_surface());
}

// Tests that when a layer with trilinear_filtering flag has its CC layer
// switched, that the trilinear_filtering flag is maintained.
TEST_P(LayerWithRealCompositorTest, SwitchCCLayerTrilinearFiltering) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> l1 = CreateLayer(LAYER_TEXTURED);
  GetCompositor()->SetRootLayer(root.get());
  root->Add(l1.get());

  l1->AddTrilinearFilteringRequest();

  // Change l1's cc::Layer.
  l1->SwitchCCLayerForTest();

  // Ensure that the trilinear_filtering flag is maintained.
  EXPECT_TRUE(l1->cc_layer_for_testing()->trilinear_filtering());
}

// Tests that when a layer with masks_to_bounds flag has its CC layer switched,
// that the masks_to_bounds flag is maintained.
TEST_P(LayerWithRealCompositorTest, SwitchCCLayerMasksToBounds) {
  std::unique_ptr<Layer> root(CreateLayer(LAYER_TEXTURED));
  std::unique_ptr<Layer> l1(CreateLayer(LAYER_TEXTURED));
  GetCompositor()->SetRootLayer(root.get());
  root->Add(l1.get());

  l1->SetMasksToBounds(true);
  EXPECT_TRUE(l1->cc_layer_for_testing()->masks_to_bounds());

  // Change l1's cc::Layer.
  l1->SwitchCCLayerForTest();

  // Ensure that the trilinear_filtering flag is maintained.
  EXPECT_TRUE(l1->cc_layer_for_testing()->masks_to_bounds());
}

// Triggerring a OnDeviceScaleFactorChanged while a layer is undergoing
// transform animation, may cause a crash. This is because an animation observer
// may mutate the tree, e.g. deleting a layer, changing ancestor z-order etc,
// which breaks the tree traversal and might lead to a use-after-free seg fault.
TEST_P(LayerWithRealCompositorTest, TreeMutationDuringScaleFactorChange) {
  TestCallbackAnimationObserver animation_observer;

  std::unique_ptr<Layer> root = CreateLayer(LAYER_SOLID_COLOR);
  GetCompositor()->SetRootLayer(root.get());

  // Tests scenarios that |layer_to_delete| is deleted when animation ends.

  std::unique_ptr<Layer> layer_to_delete = CreateLayer(LAYER_SOLID_COLOR);
  animation_observer.SetCallback(
      base::BindLambdaForTesting([&]() { layer_to_delete.reset(); }));

  root->Add(layer_to_delete.get());

  EXPECT_EQ(gfx::Transform(), layer_to_delete->GetTargetTransform());

  gfx::Transform transform;
  transform.Scale(2, 1);
  transform.Translate(10, 5);

  auto long_duration_animation =
      std::make_unique<ui::ScopedAnimationDurationScaleMode>(
          ui::ScopedAnimationDurationScaleMode::SLOW_DURATION);
  {
    ui::ScopedLayerAnimationSettings animation(layer_to_delete->GetAnimator());
    animation.AddObserver(&animation_observer);
    animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(1000));
    layer_to_delete->SetTransform(transform);
  }

  // This call should not crash.
  root->OnDeviceScaleFactorChanged(2.f);
  // |layer_to_delete| should be gone.
  EXPECT_FALSE(layer_to_delete);

  layer_to_delete = CreateLayer(LAYER_SOLID_COLOR);
  animation_observer.SetCallback(
      base::BindLambdaForTesting([&]() { layer_to_delete.reset(); }));

  std::unique_ptr<Layer> child = CreateLayer(LAYER_SOLID_COLOR);

  root->Add(layer_to_delete.get());
  layer_to_delete->Add(child.get());

  long_duration_animation =
      std::make_unique<ui::ScopedAnimationDurationScaleMode>(
          ui::ScopedAnimationDurationScaleMode::SLOW_DURATION);
  {
    ui::ScopedLayerAnimationSettings animation(layer_to_delete->GetAnimator());
    animation.AddObserver(&animation_observer);
    animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(1000));
    layer_to_delete->SetTransform(transform);
  }

  // This call should not crash.
  root->OnDeviceScaleFactorChanged(1.5f);
  // |layer_to_delete| should be gone.
  EXPECT_FALSE(layer_to_delete);

  layer_to_delete = CreateLayer(LAYER_SOLID_COLOR);
  animation_observer.SetCallback(
      base::BindLambdaForTesting([&]() { layer_to_delete.reset(); }));

  std::unique_ptr<Layer> child2 = CreateLayer(LAYER_SOLID_COLOR);

  root->Add(layer_to_delete.get());
  layer_to_delete->Add(child.get());
  layer_to_delete->Add(child2.get());

  long_duration_animation =
      std::make_unique<ui::ScopedAnimationDurationScaleMode>(
          ui::ScopedAnimationDurationScaleMode::SLOW_DURATION);
  {
    ui::ScopedLayerAnimationSettings animation(child->GetAnimator());
    animation.AddObserver(&animation_observer);
    animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(1000));
    child->SetTransform(transform);
  }

  // This call should not crash.
  root->OnDeviceScaleFactorChanged(2.f);
  // |layer_to_delete| should be gone.
  EXPECT_FALSE(layer_to_delete);

  // Tests scenarios that the tree is changed when animation ends.

  root->Add(child.get());
  root->Add(child2.get());

  animation_observer.SetCallback(base::BindLambdaForTesting(
      [&]() { root->StackChildrenAtBottom({child2.get()}); }));

  long_duration_animation =
      std::make_unique<ui::ScopedAnimationDurationScaleMode>(
          ui::ScopedAnimationDurationScaleMode::SLOW_DURATION);
  {
    ui::ScopedLayerAnimationSettings animation(child->GetAnimator());
    animation.AddObserver(&animation_observer);
    animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(1000));
    child->SetTransform(transform);
  }

  // This call should not crash.
  root->OnDeviceScaleFactorChanged(1.5f);
}

// Tests that the animators in the layer tree is added to the
// animator-collection when the root-layer is set to the compositor.
TEST_F(LayerWithDelegateTest, RootLayerAnimatorsInCompositor) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_SOLID_COLOR);
  std::unique_ptr<Layer> child =
      CreateColorLayer(SK_ColorRED, gfx::Rect(10, 10));
  child->SetAnimator(LayerAnimator::CreateImplicitAnimator());
  child->SetOpacity(0.5f);
  root->Add(child.get());

  EXPECT_FALSE(compositor()->layer_animator_collection()->HasActiveAnimators());
  compositor()->SetRootLayer(root.get());
  EXPECT_TRUE(compositor()->layer_animator_collection()->HasActiveAnimators());
}

// Tests that adding/removing a layer adds/removes the animator from its entire
// subtree from the compositor's animator-collection.
TEST_F(LayerWithDelegateTest, AddRemoveLayerUpdatesAnimatorsFromSubtree) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> child = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> grandchild =
      CreateColorLayer(SK_ColorRED, gfx::Rect(10, 10));
  root->Add(child.get());
  child->Add(grandchild.get());
  compositor()->SetRootLayer(root.get());

  grandchild->SetAnimator(LayerAnimator::CreateImplicitAnimator());
  grandchild->SetOpacity(0.5f);
  EXPECT_TRUE(compositor()->layer_animator_collection()->HasActiveAnimators());

  root->Remove(child.get());
  EXPECT_FALSE(compositor()->layer_animator_collection()->HasActiveAnimators());

  root->Add(child.get());
  EXPECT_TRUE(compositor()->layer_animator_collection()->HasActiveAnimators());
}

TEST_F(LayerWithDelegateTest, DestroyingLayerRemovesTheAnimatorFromCollection) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> child = CreateLayer(LAYER_TEXTURED);
  root->Add(child.get());
  compositor()->SetRootLayer(root.get());

  child->SetAnimator(LayerAnimator::CreateImplicitAnimator());
  child->SetOpacity(0.5f);
  EXPECT_TRUE(compositor()->layer_animator_collection()->HasActiveAnimators());

  child.reset();
  EXPECT_FALSE(compositor()->layer_animator_collection()->HasActiveAnimators());
}

// A LayerAnimationObserver that removes a child layer from a parent when an
// animation completes.
class LayerRemovingLayerAnimationObserver : public LayerAnimationObserver {
 public:
  LayerRemovingLayerAnimationObserver(Layer* root, Layer* child)
      : root_(root), child_(child) {}

  // LayerAnimationObserver:
  void OnLayerAnimationEnded(LayerAnimationSequence* sequence) override {
    root_->Remove(child_);
  }

  void OnLayerAnimationAborted(LayerAnimationSequence* sequence) override {
    root_->Remove(child_);
  }

  void OnLayerAnimationScheduled(LayerAnimationSequence* sequence) override {}

 private:
  Layer* root_;
  Layer* child_;

  DISALLOW_COPY_AND_ASSIGN(LayerRemovingLayerAnimationObserver);
};

// Verifies that empty LayerAnimators are not left behind when removing child
// Layers that own an empty LayerAnimator. See http://crbug.com/552037.
TEST_F(LayerWithDelegateTest, NonAnimatingAnimatorsAreRemovedFromCollection) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> parent = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> child = CreateLayer(LAYER_TEXTURED);
  root->Add(parent.get());
  parent->Add(child.get());
  compositor()->SetRootLayer(root.get());

  child->SetAnimator(LayerAnimator::CreateDefaultAnimator());

  LayerRemovingLayerAnimationObserver observer(root.get(), parent.get());
  child->GetAnimator()->AddObserver(&observer);

  std::unique_ptr<LayerAnimationElement> element =
      ui::LayerAnimationElement::CreateOpacityElement(
          0.5f, base::TimeDelta::FromSeconds(1));
  LayerAnimationSequence* sequence =
      new LayerAnimationSequence(std::move(element));

  child->GetAnimator()->StartAnimation(sequence);
  EXPECT_TRUE(compositor()->layer_animator_collection()->HasActiveAnimators());

  child->GetAnimator()->StopAnimating();
  EXPECT_FALSE(root->Contains(parent.get()));
  EXPECT_FALSE(compositor()->layer_animator_collection()->HasActiveAnimators());
}

namespace {

std::string Vector2dFTo100thPrecisionString(const gfx::Vector2dF& vector) {
  return base::StringPrintf("%.2f %0.2f", vector.x(), vector.y());
}

}  // namespace

TEST_P(LayerWithRealCompositorTest, SnapLayerToPixels) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> c1 = CreateLayer(LAYER_TEXTURED);
  std::unique_ptr<Layer> c11 = CreateLayer(LAYER_TEXTURED);

  viz::ParentLocalSurfaceIdAllocator allocator;
  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.25f, gfx::Size(100, 100),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  GetCompositor()->SetRootLayer(root.get());
  root->Add(c1.get());
  c1->Add(c11.get());

  root->SetBounds(gfx::Rect(0, 0, 100, 100));
  c1->SetBounds(gfx::Rect(1, 1, 10, 10));
  c11->SetBounds(gfx::Rect(1, 1, 10, 10));
  // 1 at 1.25 scale = 1.25 : (-0.25) / 1.25 = -0.20
  EXPECT_EQ("-0.20 -0.20",
            Vector2dFTo100thPrecisionString(c11->GetSubpixelOffset()));

  allocator.GenerateId();
  GetCompositor()->SetScaleAndSize(
      1.5f, gfx::Size(100, 100),
      allocator.GetCurrentLocalSurfaceIdAllocation());
  // 1 at 1.5 scale = 1.5 : (round(1.5) - 1.5) / 1.5 = 0.33
  EXPECT_EQ("0.33 0.33",
            Vector2dFTo100thPrecisionString(c11->GetSubpixelOffset()));

  c11->SetBounds(gfx::Rect(2, 2, 10, 10));
  // 2 at 1.5 scale = 3 : (round(3) - 3) / 1.5 = 0
  EXPECT_EQ("0.00 0.00",
            Vector2dFTo100thPrecisionString(c11->GetSubpixelOffset()));
}

// Verify that LayerDelegate::OnLayerBoundsChanged() is called when the bounds
// are set without an animation.
TEST(LayerDelegateTest, OnLayerBoundsChanged) {
  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  testing::StrictMock<TestLayerDelegate> delegate;
  layer->set_delegate(&delegate);
  const gfx::Rect initial_bounds = layer->bounds();
  constexpr gfx::Rect kTargetBounds(1, 2, 3, 4);
  EXPECT_CALL(delegate,
              OnLayerBoundsChanged(initial_bounds,
                                   PropertyChangeReason::NOT_FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](const gfx::Rect&, PropertyChangeReason) {
        // Verify that |layer->bounds()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->bounds(), kTargetBounds);
      }));
  layer->SetBounds(kTargetBounds);
}

// Verify that LayerDelegate::OnLayerBoundsChanged() is called at every step of
// a bounds animation.
TEST(LayerDelegateTest, OnLayerBoundsChangedAnimation) {
  ScopedAnimationDurationScaleMode scoped_animation_duration_scale_mode(
      ScopedAnimationDurationScaleMode::NORMAL_DURATION);
  LayerAnimatorTestController test_controller(
      LayerAnimator::CreateImplicitAnimator());
  LayerAnimator* const animator = test_controller.animator();

  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  testing::StrictMock<TestLayerDelegate> delegate;
  layer->set_delegate(&delegate);
  layer->SetAnimator(animator);

  const gfx::Rect initial_bounds = layer->bounds();
  constexpr gfx::Rect kTargetBounds(10, 20, 30, 40);
  const gfx::Rect step_bounds =
      gfx::Tween::RectValueBetween(0.5, initial_bounds, kTargetBounds);

  // Start the animation.
  std::unique_ptr<LayerAnimationElement> element =
      LayerAnimationElement::CreateBoundsElement(
          kTargetBounds, base::TimeDelta::FromSeconds(1));
  ASSERT_FALSE(element->IsThreaded(layer.get()));
  LayerAnimationElement* element_raw = element.get();
  animator->StartAnimation(new LayerAnimationSequence(std::move(element)));
  testing::Mock::VerifyAndClear(&delegate);

  // Progress the animation.
  EXPECT_CALL(delegate,
              OnLayerBoundsChanged(initial_bounds,
                                   PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](const gfx::Rect&, PropertyChangeReason) {
        // Verify that |layer->bounds()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->bounds(), step_bounds);
        EXPECT_TRUE(
            animator->IsAnimatingProperty(LayerAnimationElement::BOUNDS));
      }));
  test_controller.Step(element_raw->duration() / 2);
  testing::Mock::VerifyAndClear(&delegate);

  // End the animation.
  EXPECT_CALL(delegate, OnLayerBoundsChanged(
                            step_bounds, PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](const gfx::Rect&, PropertyChangeReason) {
        // Verify that |layer->bounds()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->bounds(), kTargetBounds);
        EXPECT_FALSE(
            animator->IsAnimatingProperty(LayerAnimationElement::BOUNDS));
      }));
  test_controller.Step(element_raw->duration() / 2);
  testing::Mock::VerifyAndClear(&delegate);
}

// Verify that LayerDelegate::OnLayerTransformed() is called when the transform
// is set without an animation.
TEST(LayerDelegateTest, OnLayerTransformed) {
  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  testing::StrictMock<TestLayerDelegate> delegate;
  layer->set_delegate(&delegate);
  gfx::Transform target_transform1;
  target_transform1.Skew(10.0f, 5.0f);
  {
    EXPECT_CALL(delegate,
                OnLayerTransformed(gfx::Transform(),
                                   PropertyChangeReason::NOT_FROM_ANIMATION))
        .WillOnce(testing::Invoke(
            [&](const gfx::Transform& old_transform, PropertyChangeReason) {
              // Verify that |layer->transform()| returns the correct value when
              // the delegate is notified.
              EXPECT_EQ(target_transform1, layer->transform());
            }));
    layer->SetTransform(target_transform1);
  }
  gfx::Transform target_transform2;
  target_transform2.Skew(10.0f, 5.0f);
  EXPECT_CALL(delegate,
              OnLayerTransformed(target_transform1,
                                 PropertyChangeReason::NOT_FROM_ANIMATION))
      .WillOnce(testing::Invoke(
          [&](const gfx::Transform& old_transform, PropertyChangeReason) {
            // Verify that |layer->transform()| returns the correct value when
            // the delegate is notified.
            EXPECT_EQ(target_transform2, layer->transform());
          }));
  layer->SetTransform(target_transform2);
}

// Verify that LayerDelegate::OnLayerTransformed() is called at every step of a
// non-threaded transform transition.
TEST(LayerDelegateTest, OnLayerTransformedNonThreadedAnimation) {
  ScopedAnimationDurationScaleMode scoped_animation_duration_scale_mode(
      ScopedAnimationDurationScaleMode::NORMAL_DURATION);
  LayerAnimatorTestController test_controller(
      LayerAnimator::CreateImplicitAnimator());
  LayerAnimator* const animator = test_controller.animator();

  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  testing::StrictMock<TestLayerDelegate> delegate;
  layer->set_delegate(&delegate);
  layer->SetAnimator(animator);

  auto interpolated_transform = std::make_unique<InterpolatedRotation>(10, 45);
  const gfx::Transform initial_transform =
      interpolated_transform->Interpolate(0.0);
  const gfx::Transform step_transform =
      interpolated_transform->Interpolate(0.5);
  const gfx::Transform target_transform =
      interpolated_transform->Interpolate(1.0);

  // Start the animation.
  std::unique_ptr<LayerAnimationElement> element =
      LayerAnimationElement::CreateInterpolatedTransformElement(
          std::move(interpolated_transform), base::TimeDelta::FromSeconds(1));
  // The LayerAnimationElement returned by CreateInterpolatedTransformElement()
  // is non-threaded.
  ASSERT_FALSE(element->IsThreaded(layer.get()));
  LayerAnimationElement* element_raw = element.get();
  EXPECT_CALL(delegate,
              OnLayerTransformed(gfx::Transform(),
                                 PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](const gfx::Transform& old_transform,
                                    PropertyChangeReason) {
        // Verify that |layer->transform()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->transform(), initial_transform);
        EXPECT_TRUE(
            animator->IsAnimatingProperty(LayerAnimationElement::TRANSFORM));
      }));
  animator->StartAnimation(new LayerAnimationSequence(std::move(element)));
  testing::Mock::VerifyAndClear(&delegate);

  // Progress the animation.
  EXPECT_CALL(delegate,
              OnLayerTransformed(initial_transform,
                                 PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke(
          [&](const gfx::Transform& old_transform, PropertyChangeReason) {
            // Verify that |layer->transform()| returns the correct value when
            // the delegate is notified.
            EXPECT_EQ(layer->transform(), step_transform);
          }));
  test_controller.Step(element_raw->duration() / 2);
  testing::Mock::VerifyAndClear(&delegate);

  // End the animation.
  EXPECT_CALL(
      delegate,
      OnLayerTransformed(step_transform, PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](const gfx::Transform& old_transform,
                                    PropertyChangeReason) {
        // Verify that |layer->transform()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->transform(), target_transform);
        EXPECT_FALSE(
            animator->IsAnimatingProperty(LayerAnimationElement::TRANSFORM));
      }));
  test_controller.Step(element_raw->duration() / 2);
  testing::Mock::VerifyAndClear(&delegate);
}

// Verify that LayerDelegate::OnLayerTransformed() is called at the beginning
// and at the end of a threaded transform transition.
TEST(LayerDelegateTest, OnLayerTransformedThreadedAnimation) {
  ScopedAnimationDurationScaleMode scoped_animation_duration_scale_mode(
      ScopedAnimationDurationScaleMode::NORMAL_DURATION);
  LayerAnimatorTestController test_controller(
      LayerAnimator::CreateImplicitAnimator());
  LayerAnimator* const animator = test_controller.animator();

  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  testing::StrictMock<TestLayerDelegate> delegate;
  layer->set_delegate(&delegate);
  layer->SetAnimator(animator);

  // Start the animation.
  gfx::Transform initial_transform = layer->transform();
  gfx::Transform target_transform;
  target_transform.Skew(10.0f, 5.0f);
  std::unique_ptr<LayerAnimationElement> element =
      LayerAnimationElement::CreateTransformElement(
          target_transform, base::TimeDelta::FromSeconds(1));
  ASSERT_TRUE(element->IsThreaded(layer.get()));
  LayerAnimationElement* element_raw = element.get();
  EXPECT_CALL(delegate,
              OnLayerTransformed(gfx::Transform(),
                                 PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](const gfx::Transform& old_transform,
                                    PropertyChangeReason) {
        // Verify that |layer->transform()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->transform(), initial_transform);
        EXPECT_TRUE(
            animator->IsAnimatingProperty(LayerAnimationElement::TRANSFORM));
      }));
  animator->StartAnimation(new LayerAnimationSequence(std::move(element)));
  testing::Mock::VerifyAndClear(&delegate);
  test_controller.StartThreadedAnimationsIfNeeded();

  // End the animation.
  EXPECT_CALL(delegate,
              OnLayerTransformed(initial_transform,
                                 PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](const gfx::Transform& old_transform,
                                    PropertyChangeReason) {
        // Verify that |layer->transform()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->transform(), target_transform);
        EXPECT_FALSE(
            animator->IsAnimatingProperty(LayerAnimationElement::TRANSFORM));
      }));
  test_controller.Step(
      element_raw->duration() +
      (element_raw->effective_start_time() - animator->last_step_time()));
  testing::Mock::VerifyAndClear(&delegate);
}

// Verify that LayerDelegate::OnLayerOpacityChanged() is called when the opacity
// is set without an animation.
TEST(LayerDelegateTest, OnLayerOpacityChanged) {
  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  testing::StrictMock<TestLayerDelegate> delegate;
  layer->set_delegate(&delegate);
  constexpr float kTargetOpacity = 0.5f;
  EXPECT_CALL(delegate,
              OnLayerOpacityChanged(PropertyChangeReason::NOT_FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](PropertyChangeReason) {
        // Verify that |layer->opacity()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->opacity(), kTargetOpacity);
      }));
  layer->SetOpacity(kTargetOpacity);
}

// Verify that LayerDelegate::OnLayerOpacityChanged() is called at the beginning
// and at the end of a threaded opacity animation.
TEST(LayerDelegateTest, OnLayerOpacityChangedAnimation) {
  ScopedAnimationDurationScaleMode scoped_animation_duration_scale_mode(
      ScopedAnimationDurationScaleMode::NORMAL_DURATION);
  LayerAnimatorTestController test_controller(
      LayerAnimator::CreateImplicitAnimator());
  LayerAnimator* const animator = test_controller.animator();

  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  testing::StrictMock<TestLayerDelegate> delegate;
  layer->set_delegate(&delegate);
  layer->SetAnimator(animator);

  // Start the animation.
  const float initial_opacity = layer->opacity();
  const float kTargetOpacity = 0.5f;
  std::unique_ptr<LayerAnimationElement> element =
      LayerAnimationElement::CreateOpacityElement(
          kTargetOpacity, base::TimeDelta::FromSeconds(1));
  ASSERT_TRUE(element->IsThreaded(layer.get()));
  LayerAnimationElement* element_raw = element.get();
  EXPECT_CALL(delegate,
              OnLayerOpacityChanged(PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](PropertyChangeReason) {
        // Verify that |layer->opacity()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->opacity(), initial_opacity);
        EXPECT_TRUE(
            animator->IsAnimatingProperty(LayerAnimationElement::OPACITY));
      }));
  animator->StartAnimation(new LayerAnimationSequence(std::move(element)));
  testing::Mock::VerifyAndClear(&delegate);
  test_controller.StartThreadedAnimationsIfNeeded();

  // End the animation.
  EXPECT_CALL(delegate,
              OnLayerOpacityChanged(PropertyChangeReason::FROM_ANIMATION))
      .WillOnce(testing::Invoke([&](PropertyChangeReason) {
        // Verify that |layer->opacity()| returns the correct value when the
        // delegate is notified.
        EXPECT_EQ(layer->opacity(), kTargetOpacity);
        EXPECT_FALSE(
            animator->IsAnimatingProperty(LayerAnimationElement::OPACITY));
      }));
  test_controller.Step(
      element_raw->duration() +
      (element_raw->effective_start_time() - animator->last_step_time()));
  testing::Mock::VerifyAndClear(&delegate);
}

// Verify that LayerDelegate::OnLayerAlphaShapeChanged() is called when the
// alpha shape of a layer is set.
TEST(LayerDelegateTest, OnLayerAlphaShapeChanged) {
  auto layer = std::make_unique<Layer>(LAYER_TEXTURED);
  testing::StrictMock<TestLayerDelegate> delegate;
  layer->set_delegate(&delegate);

  // Set an alpha shape for the layer. Expect the delegate to be notified.
  auto shape = std::make_unique<Layer::ShapeRects>();
  shape->emplace_back(0, 0, 10, 20);
  EXPECT_CALL(delegate, OnLayerAlphaShapeChanged());
  layer->SetAlphaShape(std::move(shape));
  testing::Mock::VerifyAndClear(&delegate);

  // Clear the alpha shape for the layer. Expect the delegate to be notified.
  EXPECT_CALL(delegate, OnLayerAlphaShapeChanged());
  layer->SetAlphaShape(nullptr);
  testing::Mock::VerifyAndClear(&delegate);
}

TEST_P(LayerWithRealCompositorTest, CompositorAnimationObserverTest) {
  std::unique_ptr<Layer> root = CreateLayer(LAYER_TEXTURED);

  root->SetAnimator(LayerAnimator::CreateImplicitAnimator());

  TestCompositorAnimationObserver animation_observer(GetCompositor());
  EXPECT_EQ(0u, animation_observer.animation_step_count());

  root->SetOpacity(0.5f);
  WaitForDraw();
  EXPECT_EQ(1u, animation_observer.animation_step_count());

  EXPECT_FALSE(animation_observer.shutdown());
  ResetCompositor();
  EXPECT_TRUE(animation_observer.shutdown());
}

}  // namespace ui