cc/trees/layer_tree_host_unittest_damage.cc - chromium/src - Git at Google

 // Copyright 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 "cc/trees/layer_tree_host.h"

 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/time/time.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_painted_scrollbar_layer.h"
 #include "cc/test/fake_picture_layer.h"
 #include "cc/test/layer_tree_test.h"
 #include "cc/trees/damage_tracker.h"
 #include "cc/trees/layer_tree_impl.h"

 namespace cc {
 namespace {

 // These tests deal with damage tracking.
 class LayerTreeHostDamageTest : public LayerTreeTest {};

 // LayerTreeHost::SetNeedsRedraw should damage the whole viewport.
 class LayerTreeHostDamageTestSetNeedsRedraw
     : public LayerTreeHostDamageTest {
   void SetupTree() override {
     // Viewport is 10x10.
     scoped_refptr<FakePictureLayer> root = FakePictureLayer::Create(&client_);
     root->SetBounds(gfx::Size(10, 10));

     layer_tree_host()->SetRootLayer(root);
     LayerTreeHostDamageTest::SetupTree();
     client_.set_bounds(root->bounds());
   }

   void BeginTest() override {
     draw_count_ = 0;
     PostSetNeedsCommitToMainThread();
   }

   void DidCommitAndDrawFrame() override {
     switch (layer_tree_host()->source_frame_number()) {
       case 1:
         layer_tree_host()->SetNeedsRedraw();
         break;
     }
   }

   DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* impl,
                                    LayerTreeHostImpl::FrameData* frame_data,
                                    DrawResult draw_result) override {
     EXPECT_EQ(DRAW_SUCCESS, draw_result);

     RenderSurfaceImpl* root_surface =
         impl->active_tree()->root_layer()->render_surface();
     gfx::Rect root_damage =
         root_surface->damage_tracker()->current_damage_rect();

     switch (draw_count_) {
       case 0:
         // The first frame has full damage.
         EXPECT_EQ(gfx::Rect(10, 10), root_damage);
         break;
       case 1:
         // The second frame has full damage.
         EXPECT_EQ(gfx::Rect(10, 10), root_damage);
         EndTest();
         break;
       case 2:
         NOTREACHED();
     }

     ++draw_count_;
     return draw_result;
   }

   void AfterTest() override {}

   int draw_count_;
   FakeContentLayerClient client_;
 };

 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostDamageTestSetNeedsRedraw);

 // LayerTreeHost::SetViewportSize should damage the whole viewport.
 class LayerTreeHostDamageTestSetViewportSize
     : public LayerTreeHostDamageTest {
   void SetupTree() override {
     // Viewport is 10x10.
     scoped_refptr<FakePictureLayer> root = FakePictureLayer::Create(&client_);
     root->SetBounds(gfx::Size(10, 10));

     layer_tree_host()->SetRootLayer(root);
     LayerTreeHostDamageTest::SetupTree();
     client_.set_bounds(root->bounds());
   }

   void BeginTest() override {
     draw_count_ = 0;
     PostSetNeedsCommitToMainThread();
   }

   void DidCommitAndDrawFrame() override {
     switch (layer_tree_host()->source_frame_number()) {
       case 1:
         layer_tree_host()->SetViewportSize(gfx::Size(15, 15));
         break;
     }
   }

   DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* impl,
                                    LayerTreeHostImpl::FrameData* frame_data,
                                    DrawResult draw_result) override {
     EXPECT_EQ(DRAW_SUCCESS, draw_result);

     RenderSurfaceImpl* root_surface =
         impl->active_tree()->root_layer()->render_surface();
     gfx::Rect root_damage =
         root_surface->damage_tracker()->current_damage_rect();

     switch (draw_count_) {
       case 0:
         // The first frame has full damage.
         EXPECT_EQ(gfx::Rect(10, 10), root_damage);
         break;
       case 1:
         // The second frame has full damage.
         EXPECT_EQ(gfx::Rect(15, 15), root_damage);
         EndTest();
         break;
       case 2:
         NOTREACHED();
     }

     ++draw_count_;
     return draw_result;
   }

   void AfterTest() override {}

   int draw_count_;
   FakeContentLayerClient client_;
 };

 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostDamageTestSetViewportSize);

 class LayerTreeHostDamageTestNoDamageDoesNotSwap
     : public LayerTreeHostDamageTest {
   void BeginTest() override {
     expect_swap_and_succeed_ = 0;
     did_swaps_ = 0;
     did_swap_and_succeed_ = 0;
     PostSetNeedsCommitToMainThread();
   }

   void SetupTree() override {
     scoped_refptr<FakePictureLayer> root = FakePictureLayer::Create(&client_);
     root->SetBounds(gfx::Size(10, 10));

     // Most of the layer isn't visible.
     content_ = FakePictureLayer::Create(&client_);
     content_->SetBounds(gfx::Size(2000, 100));
     root->AddChild(content_);

     layer_tree_host()->SetRootLayer(root);
     LayerTreeHostDamageTest::SetupTree();
     client_.set_bounds(root->bounds());
   }

   DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                    LayerTreeHostImpl::FrameData* frame_data,
                                    DrawResult draw_result) override {
     EXPECT_EQ(DRAW_SUCCESS, draw_result);

     int source_frame = host_impl->active_tree()->source_frame_number();
     switch (source_frame) {
       case 0:
         // The first frame has damage, so we should draw and swap.
         ++expect_swap_and_succeed_;
         break;
       case 1:
         // The second frame has no damage, so we should not draw and swap.
         break;
       case 2:
         // The third frame has damage again, so we should draw and swap.
         ++expect_swap_and_succeed_;
         break;
       case 3:
         // The fourth frame has no visible damage, so we should not draw and
         // swap.
         EndTest();
         break;
     }
     return draw_result;
   }

   void SwapBuffersOnThread(LayerTreeHostImpl* host_impl, bool result) override {
     ++did_swaps_;
     if (result)
       ++did_swap_and_succeed_;
     EXPECT_EQ(expect_swap_and_succeed_, did_swap_and_succeed_);
   }

   void DidCommit() override {
     int next_frame = layer_tree_host()->source_frame_number();
     switch (next_frame) {
       case 1:
         layer_tree_host()->SetNeedsCommit();
         break;
       case 2:
         // Cause visible damage.
         content_->SetNeedsDisplayRect(
             gfx::Rect(layer_tree_host()->device_viewport_size()));
         break;
       case 3:
         // Cause non-visible damage.
         content_->SetNeedsDisplayRect(gfx::Rect(1990, 1990, 10, 10));
         layer_tree_host()->SetNeedsCommit();
         break;
     }
   }

   void AfterTest() override {
     EXPECT_EQ(4, did_swaps_);
     EXPECT_EQ(2, expect_swap_and_succeed_);
     EXPECT_EQ(expect_swap_and_succeed_, did_swap_and_succeed_);
   }

   FakeContentLayerClient client_;
   scoped_refptr<FakePictureLayer> content_;
   int expect_swap_and_succeed_;
   int did_swaps_;
   int did_swap_and_succeed_;
 };

 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostDamageTestNoDamageDoesNotSwap);

 class LayerTreeHostDamageTestForcedFullDamage : public LayerTreeHostDamageTest {
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }

   void SetupTree() override {
     root_ = FakePictureLayer::Create(&client_);
     child_ = FakePictureLayer::Create(&client_);

     root_->SetBounds(gfx::Size(500, 500));
     child_->SetPosition(gfx::PointF(100.f, 100.f));
     child_->SetBounds(gfx::Size(30, 30));

     root_->AddChild(child_);
     layer_tree_host()->SetRootLayer(root_);
     LayerTreeHostDamageTest::SetupTree();
     client_.set_bounds(root_->bounds());
   }

   DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                    LayerTreeHostImpl::FrameData* frame_data,
                                    DrawResult draw_result) override {
     EXPECT_EQ(DRAW_SUCCESS, draw_result);

     RenderSurfaceImpl* root_surface =
         host_impl->active_tree()->root_layer()->render_surface();
     gfx::Rect root_damage =
         root_surface->damage_tracker()->current_damage_rect();
     root_damage.Intersect(root_surface->content_rect());

     int source_frame = host_impl->active_tree()->source_frame_number();
     switch (source_frame) {
       case 0:
         // The first frame draws and clears any damage.
         EXPECT_EQ(root_surface->content_rect(), root_damage);
         EXPECT_FALSE(frame_data->has_no_damage);
         break;
       case 1:
         // If we get a frame without damage then we don't draw.
         EXPECT_EQ(gfx::Rect(), root_damage);
         EXPECT_TRUE(frame_data->has_no_damage);

         // Then we set full damage for the next frame.
         host_impl->SetFullRootLayerDamage();
         break;
       case 2:
         // The whole frame should be damaged as requested.
         EXPECT_EQ(root_surface->content_rect(), root_damage);
         EXPECT_FALSE(frame_data->has_no_damage);

         // Just a part of the next frame should be damaged.
         child_damage_rect_ = gfx::Rect(10, 11, 12, 13);
         break;
       case 3:
         // The update rect in the child should be damaged and the damaged area
         // should match the invalidation.
         EXPECT_EQ(gfx::Rect(100 + 10, 100 + 11, 12, 13), root_damage);
         EXPECT_FALSE(frame_data->has_no_damage);

         // If we damage part of the frame, but also damage the full
         // frame, then the whole frame should be damaged.
         child_damage_rect_ = gfx::Rect(10, 11, 12, 13);
         host_impl->SetFullRootLayerDamage();
         break;
       case 4:
         // The whole frame is damaged.
         EXPECT_EQ(root_surface->content_rect(), root_damage);
         EXPECT_FALSE(frame_data->has_no_damage);

         EndTest();
         break;
     }
     return draw_result;
   }

   void DidCommitAndDrawFrame() override {
     if (!TestEnded())
       layer_tree_host()->SetNeedsCommit();

     if (!child_damage_rect_.IsEmpty()) {
       child_->SetNeedsDisplayRect(child_damage_rect_);
       child_damage_rect_ = gfx::Rect();
     }
   }

   void AfterTest() override {}

   FakeContentLayerClient client_;
   scoped_refptr<FakePictureLayer> root_;
   scoped_refptr<FakePictureLayer> child_;
   gfx::Rect child_damage_rect_;
 };

 SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostDamageTestForcedFullDamage);

 class LayerTreeHostScrollbarDamageTest : public LayerTreeHostDamageTest {
   void SetupTree() override {
     scoped_refptr<Layer> root_layer = Layer::Create();
     root_layer->SetBounds(gfx::Size(400, 400));
     root_layer->SetMasksToBounds(true);
     layer_tree_host()->SetRootLayer(root_layer);

     scoped_refptr<Layer> scroll_clip_layer = Layer::Create();
     content_layer_ = FakePictureLayer::Create(&client_);
     content_layer_->SetScrollClipLayerId(scroll_clip_layer->id());
     content_layer_->SetScrollOffset(gfx::ScrollOffset(10, 20));
     content_layer_->SetBounds(gfx::Size(100, 200));
     content_layer_->SetIsDrawable(true);
     scroll_clip_layer->SetBounds(
         gfx::Size(content_layer_->bounds().width() - 30,
                   content_layer_->bounds().height() - 50));
     scroll_clip_layer->AddChild(content_layer_);
     root_layer->AddChild(scroll_clip_layer);

     scoped_refptr<Layer> scrollbar_layer =
         FakePaintedScrollbarLayer::Create(false, true, content_layer_->id());
     scrollbar_layer->SetPosition(gfx::PointF(300.f, 300.f));
     scrollbar_layer->SetBounds(gfx::Size(10, 100));
     scrollbar_layer->ToScrollbarLayer()->SetScrollLayer(content_layer_->id());
     root_layer->AddChild(scrollbar_layer);

     gfx::RectF content_rect(content_layer_->position(),
                             gfx::SizeF(content_layer_->bounds()));
     gfx::RectF scrollbar_rect(scrollbar_layer->position(),
                               gfx::SizeF(scrollbar_layer->bounds()));
     EXPECT_FALSE(content_rect.Intersects(scrollbar_rect));

     LayerTreeHostDamageTest::SetupTree();
     client_.set_bounds(root_layer->bounds());
   }

  private:
   FakeContentLayerClient client_;

  protected:
   scoped_refptr<Layer> content_layer_;
 };

 class LayerTreeHostDamageTestScrollbarDoesDamage
     : public LayerTreeHostScrollbarDamageTest {
   void BeginTest() override {
     did_swaps_ = 0;
     PostSetNeedsCommitToMainThread();
   }

   DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                    LayerTreeHostImpl::FrameData* frame_data,
                                    DrawResult draw_result) override {
     EXPECT_EQ(DRAW_SUCCESS, draw_result);
     RenderSurfaceImpl* root_surface =
         host_impl->active_tree()->root_layer()->render_surface();
     gfx::Rect root_damage =
         root_surface->damage_tracker()->current_damage_rect();
     root_damage.Intersect(root_surface->content_rect());
     switch (did_swaps_) {
       case 0:
         // The first frame has damage, so we should draw and swap.
         break;
       case 1:
         // The second frame should not damage the scrollbars.
         EXPECT_FALSE(root_damage.Intersects(gfx::Rect(300, 300, 10, 100)));
         break;
       case 2:
         // The third frame should damage the scrollbars.
         EXPECT_TRUE(root_damage.Contains(gfx::Rect(300, 300, 10, 100)));
         break;
       case 3:
         // The fourth frame should damage the scrollbars.
         EXPECT_TRUE(root_damage.Contains(gfx::Rect(300, 300, 10, 100)));
         EndTest();
         break;
     }
     return draw_result;
   }

   void SwapBuffersOnThread(LayerTreeHostImpl* host_impl, bool result) override {
     ++did_swaps_;
     EXPECT_TRUE(result);
     LayerImpl* scroll_layer =
         host_impl->active_tree()->LayerById(content_layer_->id());
     switch (did_swaps_) {
       case 1:
         // Test that modifying the position of the content layer (not
         // scrolling) won't damage the scrollbar.
         MainThreadTaskRunner()->PostTask(
             FROM_HERE, base::Bind(&LayerTreeHostDamageTestScrollbarDoesDamage::
                                       ModifyContentLayerPosition,
                                   base::Unretained(this)));
         break;
       case 2:
         scroll_layer->ScrollBy(gfx::Vector2dF(10.f, 10.f));
         host_impl->SetNeedsRedraw();
         break;
       case 3:
         // We will resize the content layer, on the main thread.
         MainThreadTaskRunner()->PostTask(
             FROM_HERE,
             base::Bind(
                 &LayerTreeHostDamageTestScrollbarDoesDamage::ResizeScrollLayer,
                 base::Unretained(this)));
         break;
     }
   }

   void ModifyContentLayerPosition() {
     EXPECT_EQ(1, did_swaps_);
     content_layer_->SetPosition(gfx::PointF(10.f, 10.f));
   }

   void ResizeScrollLayer() {
     EXPECT_EQ(3, did_swaps_);
     Layer* root = layer_tree_host()->root_layer();
     content_layer_->SetBounds(
         gfx::Size(root->bounds().width() + 60, root->bounds().height() + 100));
   }

   void AfterTest() override { EXPECT_EQ(4, did_swaps_); }

   int did_swaps_;
 };

 MULTI_THREAD_TEST_F(LayerTreeHostDamageTestScrollbarDoesDamage);

 class LayerTreeHostDamageTestScrollbarCommitDoesNoDamage
     : public LayerTreeHostScrollbarDamageTest {
   void BeginTest() override {
     did_swaps_ = 0;
     PostSetNeedsCommitToMainThread();
   }

   DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                    LayerTreeHostImpl::FrameData* frame_data,
                                    DrawResult draw_result) override {
     EXPECT_EQ(DRAW_SUCCESS, draw_result);
     RenderSurfaceImpl* root_surface =
         host_impl->active_tree()->root_layer()->render_surface();
     gfx::Rect root_damage =
         root_surface->damage_tracker()->current_damage_rect();
     root_damage.Intersect(root_surface->content_rect());
     int frame = host_impl->active_tree()->source_frame_number();
     switch (did_swaps_) {
       case 0:
         // The first frame has damage, so we should draw and swap.
         EXPECT_EQ(0, frame);
         break;
       case 1:
         // The second frame has scrolled, so the scrollbar should be damaged.
         EXPECT_EQ(0, frame);
         EXPECT_TRUE(root_damage.Contains(gfx::Rect(300, 300, 10, 100)));
         break;
       case 2:
         // The third frame (after the commit) has no changes, so it shouldn't.
         EXPECT_EQ(1, frame);
         EXPECT_FALSE(root_damage.Intersects(gfx::Rect(300, 300, 10, 100)));
         break;
       default:
         NOTREACHED();
         break;
     }
     return draw_result;
   }

   void SwapBuffersOnThread(LayerTreeHostImpl* host_impl, bool result) override {
     ++did_swaps_;
     EXPECT_TRUE(result);
     LayerImpl* scroll_layer =
         host_impl->active_tree()->LayerById(content_layer_->id());
     switch (did_swaps_) {
       case 1:
         // Scroll on the thread.  This should damage the scrollbar for the
         // next draw on the thread.
         scroll_layer->ScrollBy(gfx::Vector2dF(10.f, 10.f));
         host_impl->SetNeedsRedraw();
         break;
       case 2:
         // Forcibly send the scroll to the main thread.
         PostSetNeedsCommitToMainThread();
         break;
       case 3:
         // First swap after second commit.
         EndTest();
         break;
       default:
         NOTREACHED();
         break;
     }
   }

   void AfterTest() override { EXPECT_EQ(3, did_swaps_); }

   int did_swaps_;
 };

 MULTI_THREAD_TEST_F(LayerTreeHostDamageTestScrollbarCommitDoesNoDamage);

 }  // namespace
 }  // namespace cc
	// Copyright 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 "cc/trees/layer_tree_host.h"

	#include "base/bind.h"
	#include "base/callback.h"
	#include "base/location.h"
	#include "base/time/time.h"
	#include "cc/layers/solid_color_layer.h"
	#include "cc/test/fake_content_layer_client.h"
	#include "cc/test/fake_painted_scrollbar_layer.h"
	#include "cc/test/fake_picture_layer.h"
	#include "cc/test/layer_tree_test.h"
	#include "cc/trees/damage_tracker.h"
	#include "cc/trees/layer_tree_impl.h"

	namespace cc {
	namespace {

	// These tests deal with damage tracking.
	class LayerTreeHostDamageTest : public LayerTreeTest {};

	// LayerTreeHost::SetNeedsRedraw should damage the whole viewport.
	class LayerTreeHostDamageTestSetNeedsRedraw
	: public LayerTreeHostDamageTest {
	void SetupTree() override {
	// Viewport is 10x10.
	scoped_refptr<FakePictureLayer> root = FakePictureLayer::Create(&client_);
	root->SetBounds(gfx::Size(10, 10));

	layer_tree_host()->SetRootLayer(root);
	LayerTreeHostDamageTest::SetupTree();
	client_.set_bounds(root->bounds());
	}

	void BeginTest() override {
	draw_count_ = 0;
	PostSetNeedsCommitToMainThread();
	}

	void DidCommitAndDrawFrame() override {
	switch (layer_tree_host()->source_frame_number()) {
	case 1:
	layer_tree_host()->SetNeedsRedraw();
	break;
	}
	}

	DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* impl,
	LayerTreeHostImpl::FrameData* frame_data,
	DrawResult draw_result) override {
	EXPECT_EQ(DRAW_SUCCESS, draw_result);

	RenderSurfaceImpl* root_surface =
	impl->active_tree()->root_layer()->render_surface();
	gfx::Rect root_damage =
	root_surface->damage_tracker()->current_damage_rect();

	switch (draw_count_) {
	case 0:
	// The first frame has full damage.
	EXPECT_EQ(gfx::Rect(10, 10), root_damage);
	break;
	case 1:
	// The second frame has full damage.
	EXPECT_EQ(gfx::Rect(10, 10), root_damage);
	EndTest();
	break;
	case 2:
	NOTREACHED();
	}

	++draw_count_;
	return draw_result;
	}

	void AfterTest() override {}

	int draw_count_;
	FakeContentLayerClient client_;
	};

	SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostDamageTestSetNeedsRedraw);

	// LayerTreeHost::SetViewportSize should damage the whole viewport.
	class LayerTreeHostDamageTestSetViewportSize
	: public LayerTreeHostDamageTest {
	void SetupTree() override {
	// Viewport is 10x10.
	scoped_refptr<FakePictureLayer> root = FakePictureLayer::Create(&client_);
	root->SetBounds(gfx::Size(10, 10));

	layer_tree_host()->SetRootLayer(root);
	LayerTreeHostDamageTest::SetupTree();
	client_.set_bounds(root->bounds());
	}

	void BeginTest() override {
	draw_count_ = 0;
	PostSetNeedsCommitToMainThread();
	}

	void DidCommitAndDrawFrame() override {
	switch (layer_tree_host()->source_frame_number()) {
	case 1:
	layer_tree_host()->SetViewportSize(gfx::Size(15, 15));
	break;
	}
	}

	DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* impl,
	LayerTreeHostImpl::FrameData* frame_data,
	DrawResult draw_result) override {
	EXPECT_EQ(DRAW_SUCCESS, draw_result);

	RenderSurfaceImpl* root_surface =
	impl->active_tree()->root_layer()->render_surface();
	gfx::Rect root_damage =
	root_surface->damage_tracker()->current_damage_rect();

	switch (draw_count_) {
	case 0:
	// The first frame has full damage.
	EXPECT_EQ(gfx::Rect(10, 10), root_damage);
	break;
	case 1:
	// The second frame has full damage.
	EXPECT_EQ(gfx::Rect(15, 15), root_damage);
	EndTest();
	break;
	case 2:
	NOTREACHED();
	}

	++draw_count_;
	return draw_result;
	}

	void AfterTest() override {}

	int draw_count_;
	FakeContentLayerClient client_;
	};

	SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostDamageTestSetViewportSize);

	class LayerTreeHostDamageTestNoDamageDoesNotSwap
	: public LayerTreeHostDamageTest {
	void BeginTest() override {
	expect_swap_and_succeed_ = 0;
	did_swaps_ = 0;
	did_swap_and_succeed_ = 0;
	PostSetNeedsCommitToMainThread();
	}

	void SetupTree() override {
	scoped_refptr<FakePictureLayer> root = FakePictureLayer::Create(&client_);
	root->SetBounds(gfx::Size(10, 10));

	// Most of the layer isn't visible.
	content_ = FakePictureLayer::Create(&client_);
	content_->SetBounds(gfx::Size(2000, 100));
	root->AddChild(content_);

	layer_tree_host()->SetRootLayer(root);
	LayerTreeHostDamageTest::SetupTree();
	client_.set_bounds(root->bounds());
	}

	DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
	LayerTreeHostImpl::FrameData* frame_data,
	DrawResult draw_result) override {
	EXPECT_EQ(DRAW_SUCCESS, draw_result);

	int source_frame = host_impl->active_tree()->source_frame_number();
	switch (source_frame) {
	case 0:
	// The first frame has damage, so we should draw and swap.
	++expect_swap_and_succeed_;
	break;
	case 1:
	// The second frame has no damage, so we should not draw and swap.
	break;
	case 2:
	// The third frame has damage again, so we should draw and swap.
	++expect_swap_and_succeed_;
	break;
	case 3:
	// The fourth frame has no visible damage, so we should not draw and
	// swap.
	EndTest();
	break;
	}
	return draw_result;
	}

	void SwapBuffersOnThread(LayerTreeHostImpl* host_impl, bool result) override {
	++did_swaps_;
	if (result)
	++did_swap_and_succeed_;
	EXPECT_EQ(expect_swap_and_succeed_, did_swap_and_succeed_);
	}

	void DidCommit() override {
	int next_frame = layer_tree_host()->source_frame_number();
	switch (next_frame) {
	case 1:
	layer_tree_host()->SetNeedsCommit();
	break;
	case 2:
	// Cause visible damage.
	content_->SetNeedsDisplayRect(
	gfx::Rect(layer_tree_host()->device_viewport_size()));
	break;
	case 3:
	// Cause non-visible damage.
	content_->SetNeedsDisplayRect(gfx::Rect(1990, 1990, 10, 10));
	layer_tree_host()->SetNeedsCommit();
	break;
	}
	}

	void AfterTest() override {
	EXPECT_EQ(4, did_swaps_);
	EXPECT_EQ(2, expect_swap_and_succeed_);
	EXPECT_EQ(expect_swap_and_succeed_, did_swap_and_succeed_);
	}

	FakeContentLayerClient client_;
	scoped_refptr<FakePictureLayer> content_;
	int expect_swap_and_succeed_;
	int did_swaps_;
	int did_swap_and_succeed_;
	};

	SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostDamageTestNoDamageDoesNotSwap);

	class LayerTreeHostDamageTestForcedFullDamage : public LayerTreeHostDamageTest {
	void BeginTest() override { PostSetNeedsCommitToMainThread(); }

	void SetupTree() override {
	root_ = FakePictureLayer::Create(&client_);
	child_ = FakePictureLayer::Create(&client_);

	root_->SetBounds(gfx::Size(500, 500));
	child_->SetPosition(gfx::PointF(100.f, 100.f));
	child_->SetBounds(gfx::Size(30, 30));

	root_->AddChild(child_);
	layer_tree_host()->SetRootLayer(root_);
	LayerTreeHostDamageTest::SetupTree();
	client_.set_bounds(root_->bounds());
	}

	DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
	LayerTreeHostImpl::FrameData* frame_data,
	DrawResult draw_result) override {
	EXPECT_EQ(DRAW_SUCCESS, draw_result);

	RenderSurfaceImpl* root_surface =
	host_impl->active_tree()->root_layer()->render_surface();
	gfx::Rect root_damage =
	root_surface->damage_tracker()->current_damage_rect();
	root_damage.Intersect(root_surface->content_rect());

	int source_frame = host_impl->active_tree()->source_frame_number();
	switch (source_frame) {
	case 0:
	// The first frame draws and clears any damage.
	EXPECT_EQ(root_surface->content_rect(), root_damage);
	EXPECT_FALSE(frame_data->has_no_damage);
	break;
	case 1:
	// If we get a frame without damage then we don't draw.
	EXPECT_EQ(gfx::Rect(), root_damage);
	EXPECT_TRUE(frame_data->has_no_damage);

	// Then we set full damage for the next frame.
	host_impl->SetFullRootLayerDamage();
	break;
	case 2:
	// The whole frame should be damaged as requested.
	EXPECT_EQ(root_surface->content_rect(), root_damage);
	EXPECT_FALSE(frame_data->has_no_damage);

	// Just a part of the next frame should be damaged.
	child_damage_rect_ = gfx::Rect(10, 11, 12, 13);
	break;
	case 3:
	// The update rect in the child should be damaged and the damaged area
	// should match the invalidation.
	EXPECT_EQ(gfx::Rect(100 + 10, 100 + 11, 12, 13), root_damage);
	EXPECT_FALSE(frame_data->has_no_damage);

	// If we damage part of the frame, but also damage the full
	// frame, then the whole frame should be damaged.
	child_damage_rect_ = gfx::Rect(10, 11, 12, 13);
	host_impl->SetFullRootLayerDamage();
	break;
	case 4:
	// The whole frame is damaged.
	EXPECT_EQ(root_surface->content_rect(), root_damage);
	EXPECT_FALSE(frame_data->has_no_damage);

	EndTest();
	break;
	}
	return draw_result;
	}

	void DidCommitAndDrawFrame() override {
	if (!TestEnded())
	layer_tree_host()->SetNeedsCommit();

	if (!child_damage_rect_.IsEmpty()) {
	child_->SetNeedsDisplayRect(child_damage_rect_);
	child_damage_rect_ = gfx::Rect();
	}
	}

	void AfterTest() override {}

	FakeContentLayerClient client_;
	scoped_refptr<FakePictureLayer> root_;
	scoped_refptr<FakePictureLayer> child_;
	gfx::Rect child_damage_rect_;
	};

	SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostDamageTestForcedFullDamage);

	class LayerTreeHostScrollbarDamageTest : public LayerTreeHostDamageTest {
	void SetupTree() override {
	scoped_refptr<Layer> root_layer = Layer::Create();
	root_layer->SetBounds(gfx::Size(400, 400));
	root_layer->SetMasksToBounds(true);
	layer_tree_host()->SetRootLayer(root_layer);

	scoped_refptr<Layer> scroll_clip_layer = Layer::Create();
	content_layer_ = FakePictureLayer::Create(&client_);
	content_layer_->SetScrollClipLayerId(scroll_clip_layer->id());
	content_layer_->SetScrollOffset(gfx::ScrollOffset(10, 20));
	content_layer_->SetBounds(gfx::Size(100, 200));
	content_layer_->SetIsDrawable(true);
	scroll_clip_layer->SetBounds(
	gfx::Size(content_layer_->bounds().width() - 30,
	content_layer_->bounds().height() - 50));
	scroll_clip_layer->AddChild(content_layer_);
	root_layer->AddChild(scroll_clip_layer);

	scoped_refptr<Layer> scrollbar_layer =
	FakePaintedScrollbarLayer::Create(false, true, content_layer_->id());
	scrollbar_layer->SetPosition(gfx::PointF(300.f, 300.f));
	scrollbar_layer->SetBounds(gfx::Size(10, 100));
	scrollbar_layer->ToScrollbarLayer()->SetScrollLayer(content_layer_->id());
	root_layer->AddChild(scrollbar_layer);

	gfx::RectF content_rect(content_layer_->position(),
	gfx::SizeF(content_layer_->bounds()));
	gfx::RectF scrollbar_rect(scrollbar_layer->position(),
	gfx::SizeF(scrollbar_layer->bounds()));
	EXPECT_FALSE(content_rect.Intersects(scrollbar_rect));

	LayerTreeHostDamageTest::SetupTree();
	client_.set_bounds(root_layer->bounds());
	}

	private:
	FakeContentLayerClient client_;

	protected:
	scoped_refptr<Layer> content_layer_;
	};

	class LayerTreeHostDamageTestScrollbarDoesDamage
	: public LayerTreeHostScrollbarDamageTest {
	void BeginTest() override {
	did_swaps_ = 0;
	PostSetNeedsCommitToMainThread();
	}

	DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
	LayerTreeHostImpl::FrameData* frame_data,
	DrawResult draw_result) override {
	EXPECT_EQ(DRAW_SUCCESS, draw_result);
	RenderSurfaceImpl* root_surface =
	host_impl->active_tree()->root_layer()->render_surface();
	gfx::Rect root_damage =
	root_surface->damage_tracker()->current_damage_rect();
	root_damage.Intersect(root_surface->content_rect());
	switch (did_swaps_) {
	case 0:
	// The first frame has damage, so we should draw and swap.
	break;
	case 1:
	// The second frame should not damage the scrollbars.
	EXPECT_FALSE(root_damage.Intersects(gfx::Rect(300, 300, 10, 100)));
	break;
	case 2:
	// The third frame should damage the scrollbars.
	EXPECT_TRUE(root_damage.Contains(gfx::Rect(300, 300, 10, 100)));
	break;
	case 3:
	// The fourth frame should damage the scrollbars.
	EXPECT_TRUE(root_damage.Contains(gfx::Rect(300, 300, 10, 100)));
	EndTest();
	break;
	}
	return draw_result;
	}

	void SwapBuffersOnThread(LayerTreeHostImpl* host_impl, bool result) override {
	++did_swaps_;
	EXPECT_TRUE(result);
	LayerImpl* scroll_layer =
	host_impl->active_tree()->LayerById(content_layer_->id());
	switch (did_swaps_) {
	case 1:
	// Test that modifying the position of the content layer (not
	// scrolling) won't damage the scrollbar.
	MainThreadTaskRunner()->PostTask(
	FROM_HERE, base::Bind(&LayerTreeHostDamageTestScrollbarDoesDamage::
	ModifyContentLayerPosition,
	base::Unretained(this)));
	break;
	case 2:
	scroll_layer->ScrollBy(gfx::Vector2dF(10.f, 10.f));
	host_impl->SetNeedsRedraw();
	break;
	case 3:
	// We will resize the content layer, on the main thread.
	MainThreadTaskRunner()->PostTask(
	FROM_HERE,
	base::Bind(
	&LayerTreeHostDamageTestScrollbarDoesDamage::ResizeScrollLayer,
	base::Unretained(this)));
	break;
	}
	}

	void ModifyContentLayerPosition() {
	EXPECT_EQ(1, did_swaps_);
	content_layer_->SetPosition(gfx::PointF(10.f, 10.f));
	}

	void ResizeScrollLayer() {
	EXPECT_EQ(3, did_swaps_);
	Layer* root = layer_tree_host()->root_layer();
	content_layer_->SetBounds(
	gfx::Size(root->bounds().width() + 60, root->bounds().height() + 100));
	}

	void AfterTest() override { EXPECT_EQ(4, did_swaps_); }

	int did_swaps_;
	};

	MULTI_THREAD_TEST_F(LayerTreeHostDamageTestScrollbarDoesDamage);

	class LayerTreeHostDamageTestScrollbarCommitDoesNoDamage
	: public LayerTreeHostScrollbarDamageTest {
	void BeginTest() override {
	did_swaps_ = 0;
	PostSetNeedsCommitToMainThread();
	}

	DrawResult PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
	LayerTreeHostImpl::FrameData* frame_data,
	DrawResult draw_result) override {
	EXPECT_EQ(DRAW_SUCCESS, draw_result);
	RenderSurfaceImpl* root_surface =
	host_impl->active_tree()->root_layer()->render_surface();
	gfx::Rect root_damage =
	root_surface->damage_tracker()->current_damage_rect();
	root_damage.Intersect(root_surface->content_rect());
	int frame = host_impl->active_tree()->source_frame_number();
	switch (did_swaps_) {
	case 0:
	// The first frame has damage, so we should draw and swap.
	EXPECT_EQ(0, frame);
	break;
	case 1:
	// The second frame has scrolled, so the scrollbar should be damaged.
	EXPECT_EQ(0, frame);
	EXPECT_TRUE(root_damage.Contains(gfx::Rect(300, 300, 10, 100)));
	break;
	case 2:
	// The third frame (after the commit) has no changes, so it shouldn't.
	EXPECT_EQ(1, frame);
	EXPECT_FALSE(root_damage.Intersects(gfx::Rect(300, 300, 10, 100)));
	break;
	default:
	NOTREACHED();
	break;
	}
	return draw_result;
	}

	void SwapBuffersOnThread(LayerTreeHostImpl* host_impl, bool result) override {
	++did_swaps_;
	EXPECT_TRUE(result);
	LayerImpl* scroll_layer =
	host_impl->active_tree()->LayerById(content_layer_->id());
	switch (did_swaps_) {
	case 1:
	// Scroll on the thread. This should damage the scrollbar for the
	// next draw on the thread.
	scroll_layer->ScrollBy(gfx::Vector2dF(10.f, 10.f));
	host_impl->SetNeedsRedraw();
	break;
	case 2:
	// Forcibly send the scroll to the main thread.
	PostSetNeedsCommitToMainThread();
	break;
	case 3:
	// First swap after second commit.
	EndTest();
	break;
	default:
	NOTREACHED();
	break;
	}
	}

	void AfterTest() override { EXPECT_EQ(3, did_swaps_); }

	int did_swaps_;
	};

	MULTI_THREAD_TEST_F(LayerTreeHostDamageTestScrollbarCommitDoesNoDamage);

	} // namespace
	} // namespace cc