cc/layers/layer_impl_unittest.cc

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/layers/layer_impl.h"
   6
   7 #include "cc/layers/painted_scrollbar_layer_impl.h"
   8 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
   9 #include "cc/output/filter_operation.h"
  10 #include "cc/output/filter_operations.h"
  11 #include "cc/test/fake_impl_proxy.h"
  12 #include "cc/test/fake_layer_tree_host_impl.h"
  13 #include "cc/test/fake_output_surface.h"
  14 #include "cc/test/geometry_test_utils.h"
  15 #include "cc/test/test_shared_bitmap_manager.h"
  16 #include "cc/trees/layer_tree_impl.h"
  17 #include "cc/trees/single_thread_proxy.h"
  18 #include "cc/trees/tree_synchronizer.h"
  19 #include "testing/gmock/include/gmock/gmock.h"
  20 #include "testing/gtest/include/gtest/gtest.h"
  21 #include "third_party/skia/include/effects/SkBlurImageFilter.h"
  22
  23 namespace cc {
  24 namespace {
  25
  26 #define EXECUTE_AND_VERIFY_SUBTREE_CHANGED(code_to_test)                       \
  27   root->ResetAllChangeTrackingForSubtree();                                    \
  28   code_to_test;                                                                \
  29   EXPECT_TRUE(root->needs_push_properties());                                  \
  30   EXPECT_FALSE(child->needs_push_properties());                                \
  31   EXPECT_FALSE(grand_child->needs_push_properties());                          \
  32   EXPECT_TRUE(root->LayerPropertyChanged());                                   \
  33   EXPECT_TRUE(child->LayerPropertyChanged());                                  \
  34   EXPECT_TRUE(grand_child->LayerPropertyChanged());
  35
  36 #define EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(code_to_test)                \
  37   root->ResetAllChangeTrackingForSubtree();                                    \
  38   code_to_test;                                                                \
  39   EXPECT_FALSE(root->needs_push_properties());                                 \
  40   EXPECT_FALSE(child->needs_push_properties());                                \
  41   EXPECT_FALSE(grand_child->needs_push_properties());                          \
  42   EXPECT_FALSE(root->LayerPropertyChanged());                                  \
  43   EXPECT_FALSE(child->LayerPropertyChanged());                                 \
  44   EXPECT_FALSE(grand_child->LayerPropertyChanged());
  45
  46 #define EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(   \
  47       code_to_test)                                                            \
  48   root->ResetAllChangeTrackingForSubtree();                                    \
  49   code_to_test;                                                                \
  50   EXPECT_TRUE(root->needs_push_properties());                                  \
  51   EXPECT_FALSE(child->needs_push_properties());                                \
  52   EXPECT_FALSE(grand_child->needs_push_properties());                          \
  53   EXPECT_FALSE(root->LayerPropertyChanged());                                  \
  54   EXPECT_FALSE(child->LayerPropertyChanged());                                 \
  55   EXPECT_FALSE(grand_child->LayerPropertyChanged());
  56
  57 #define EXECUTE_AND_VERIFY_ONLY_LAYER_CHANGED(code_to_test)                    \
  58   root->ResetAllChangeTrackingForSubtree();                                    \
  59   code_to_test;                                                                \
  60   EXPECT_TRUE(root->needs_push_properties());                                  \
  61   EXPECT_FALSE(child->needs_push_properties());                                \
  62   EXPECT_FALSE(grand_child->needs_push_properties());                          \
  63   EXPECT_TRUE(root->LayerPropertyChanged());                                   \
  64   EXPECT_FALSE(child->LayerPropertyChanged());                                 \
  65   EXPECT_FALSE(grand_child->LayerPropertyChanged());
  66
  67 #define VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(code_to_test)                      \
  68   root->ResetAllChangeTrackingForSubtree();                                    \
  69   host_impl.ForcePrepareToDraw();                                              \
  70   EXPECT_FALSE(host_impl.active_tree()->needs_update_draw_properties());       \
  71   code_to_test;                                                                \
  72   EXPECT_TRUE(host_impl.active_tree()->needs_update_draw_properties());
  73
  74 #define VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(code_to_test)                   \
  75   root->ResetAllChangeTrackingForSubtree();                                    \
  76   host_impl.ForcePrepareToDraw();                                              \
  77   EXPECT_FALSE(host_impl.active_tree()->needs_update_draw_properties());       \
  78   code_to_test;                                                                \
  79   EXPECT_FALSE(host_impl.active_tree()->needs_update_draw_properties());
  80
  81 TEST(LayerImplTest, VerifyLayerChangesAreTrackedProperly) {
  82   //
  83   // This test checks that layerPropertyChanged() has the correct behavior.
  84   //
  85
  86   // The constructor on this will fake that we are on the correct thread.
  87   // Create a simple LayerImpl tree:
  88   FakeImplProxy proxy;
  89   TestSharedBitmapManager shared_bitmap_manager;
  90   FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
  91   EXPECT_TRUE(host_impl.InitializeRenderer(FakeOutputSurface::Create3d()));
  92   scoped_ptr<LayerImpl> root_clip =
  93       LayerImpl::Create(host_impl.active_tree(), 1);
  94   scoped_ptr<LayerImpl> root_ptr =
  95       LayerImpl::Create(host_impl.active_tree(), 2);
  96   LayerImpl* root = root_ptr.get();
  97   root_clip->AddChild(root_ptr.Pass());
  98   scoped_ptr<LayerImpl> scroll_parent =
  99       LayerImpl::Create(host_impl.active_tree(), 3);
 100   LayerImpl* scroll_child = LayerImpl::Create(host_impl.active_tree(), 4).get();
 101   std::set<LayerImpl*>* scroll_children = new std::set<LayerImpl*>();
 102   scroll_children->insert(scroll_child);
 103   scroll_children->insert(root);
 104   root->SetHasRenderSurface(true);
 105
 106   scoped_ptr<LayerImpl> clip_parent =
 107       LayerImpl::Create(host_impl.active_tree(), 5);
 108   LayerImpl* clip_child = LayerImpl::Create(host_impl.active_tree(), 6).get();
 109   std::set<LayerImpl*>* clip_children = new std::set<LayerImpl*>();
 110   clip_children->insert(clip_child);
 111   clip_children->insert(root);
 112
 113   root->AddChild(LayerImpl::Create(host_impl.active_tree(), 7));
 114   LayerImpl* child = root->children()[0];
 115   child->AddChild(LayerImpl::Create(host_impl.active_tree(), 8));
 116   LayerImpl* grand_child = child->children()[0];
 117
 118   root->SetScrollClipLayer(root_clip->id());
 119
 120   // Adding children is an internal operation and should not mark layers as
 121   // changed.
 122   EXPECT_FALSE(root->LayerPropertyChanged());
 123   EXPECT_FALSE(child->LayerPropertyChanged());
 124   EXPECT_FALSE(grand_child->LayerPropertyChanged());
 125
 126   gfx::PointF arbitrary_point_f = gfx::PointF(0.125f, 0.25f);
 127   gfx::Point3F arbitrary_point_3f = gfx::Point3F(0.125f, 0.25f, 0.f);
 128   float arbitrary_number = 0.352f;
 129   gfx::Size arbitrary_size = gfx::Size(111, 222);
 130   gfx::Point arbitrary_point = gfx::Point(333, 444);
 131   gfx::Vector2d arbitrary_vector2d = gfx::Vector2d(111, 222);
 132   gfx::Rect arbitrary_rect = gfx::Rect(arbitrary_point, arbitrary_size);
 133   gfx::RectF arbitrary_rect_f =
 134       gfx::RectF(arbitrary_point_f, gfx::SizeF(1.234f, 5.678f));
 135   SkColor arbitrary_color = SkColorSetRGB(10, 20, 30);
 136   gfx::Transform arbitrary_transform;
 137   arbitrary_transform.Scale3d(0.1f, 0.2f, 0.3f);
 138   FilterOperations arbitrary_filters;
 139   arbitrary_filters.Append(FilterOperation::CreateOpacityFilter(0.5f));
 140   SkXfermode::Mode arbitrary_blend_mode = SkXfermode::kMultiply_Mode;
 141
 142   // These properties are internal, and should not be considered "change" when
 143   // they are used.
 144   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
 145       root->SetUpdateRect(arbitrary_rect));
 146   EXECUTE_AND_VERIFY_ONLY_LAYER_CHANGED(root->SetBounds(arbitrary_size));
 147
 148   // Changing these properties affects the entire subtree of layers.
 149   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(
 150       root->SetTransformOrigin(arbitrary_point_3f));
 151   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetFilters(arbitrary_filters));
 152   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetFilters(FilterOperations()));
 153   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(
 154       root->SetMaskLayer(LayerImpl::Create(host_impl.active_tree(), 9)));
 155   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetMasksToBounds(true));
 156   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetContentsOpaque(true));
 157   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(
 158       root->SetReplicaLayer(LayerImpl::Create(host_impl.active_tree(), 10)));
 159   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetPosition(arbitrary_point_f));
 160   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetShouldFlattenTransform(false));
 161   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->Set3dSortingContextId(1));
 162   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(
 163       root->SetDoubleSided(false));  // constructor initializes it to "true".
 164   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->ScrollBy(arbitrary_vector2d));
 165   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetScrollDelta(gfx::Vector2d()));
 166   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->PushScrollOffsetFromMainThread(
 167       gfx::ScrollOffset(arbitrary_vector2d)));
 168   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetHideLayerAndSubtree(true));
 169   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetOpacity(arbitrary_number));
 170   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetBlendMode(arbitrary_blend_mode));
 171   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetTransform(arbitrary_transform));
 172
 173   // Changing these properties only affects the layer itself.
 174   EXECUTE_AND_VERIFY_ONLY_LAYER_CHANGED(root->SetContentBounds(arbitrary_size));
 175   EXECUTE_AND_VERIFY_ONLY_LAYER_CHANGED(
 176       root->SetContentsScale(arbitrary_number, arbitrary_number));
 177   EXECUTE_AND_VERIFY_ONLY_LAYER_CHANGED(root->SetDrawsContent(true));
 178   EXECUTE_AND_VERIFY_ONLY_LAYER_CHANGED(
 179       root->SetBackgroundColor(arbitrary_color));
 180   EXECUTE_AND_VERIFY_ONLY_LAYER_CHANGED(
 181       root->SetBackgroundFilters(arbitrary_filters));
 182
 183   // Special case: check that SetBounds changes behavior depending on
 184   // masksToBounds.
 185   root->SetMasksToBounds(false);
 186   EXECUTE_AND_VERIFY_ONLY_LAYER_CHANGED(root->SetBounds(gfx::Size(135, 246)));
 187   root->SetMasksToBounds(true);
 188   // Should be a different size than previous call, to ensure it marks tree
 189   // changed.
 190   EXECUTE_AND_VERIFY_SUBTREE_CHANGED(root->SetBounds(arbitrary_size));
 191
 192   // Changing this property does not cause the layer to be marked as changed
 193   // but does cause the layer to need to push properties.
 194   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
 195       root->SetIsRootForIsolatedGroup(true));
 196
 197   // Changing these properties should cause the layer to need to push properties
 198   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
 199       root->SetScrollParent(scroll_parent.get()));
 200   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
 201       root->SetScrollChildren(scroll_children));
 202   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
 203       root->SetClipParent(clip_parent.get()));
 204   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
 205       root->SetClipChildren(clip_children));
 206   EXECUTE_AND_VERIFY_NEEDS_PUSH_PROPERTIES_AND_SUBTREE_DID_NOT_CHANGE(
 207       root->SetNumDescendantsThatDrawContent(10));
 208
 209   // After setting all these properties already, setting to the exact same
 210   // values again should not cause any change.
 211   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 212       root->SetTransformOrigin(arbitrary_point_3f));
 213   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(root->SetMasksToBounds(true));
 214   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 215       root->SetPosition(arbitrary_point_f));
 216   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 217       root->SetShouldFlattenTransform(false));
 218   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(root->Set3dSortingContextId(1));
 219   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 220       root->SetTransform(arbitrary_transform));
 221   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 222       root->SetDoubleSided(false));  // constructor initializes it to "true".
 223   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 224       root->SetScrollDelta(gfx::Vector2d()));
 225   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 226       root->PushScrollOffsetFromMainThread(
 227           gfx::ScrollOffset(arbitrary_vector2d)));
 228   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 229       root->SetContentBounds(arbitrary_size));
 230   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 231       root->SetContentsScale(arbitrary_number, arbitrary_number));
 232   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(root->SetContentsOpaque(true));
 233   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(root->SetOpacity(arbitrary_number));
 234   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 235       root->SetBlendMode(arbitrary_blend_mode));
 236   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 237       root->SetIsRootForIsolatedGroup(true));
 238   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(root->SetDrawsContent(true));
 239   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(root->SetBounds(arbitrary_size));
 240   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 241       root->SetScrollParent(scroll_parent.get()));
 242   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 243       root->SetScrollChildren(scroll_children));
 244   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 245       root->SetClipParent(clip_parent.get()));
 246   EXECUTE_AND_VERIFY_SUBTREE_DID_NOT_CHANGE(
 247       root->SetClipChildren(clip_children));
 248 }
 249
 250 TEST(LayerImplTest, VerifyNeedsUpdateDrawProperties) {
 251   FakeImplProxy proxy;
 252   TestSharedBitmapManager shared_bitmap_manager;
 253   FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
 254   EXPECT_TRUE(host_impl.InitializeRenderer(FakeOutputSurface::Create3d()));
 255   host_impl.active_tree()->SetRootLayer(
 256       LayerImpl::Create(host_impl.active_tree(), 1));
 257   LayerImpl* root = host_impl.active_tree()->root_layer();
 258   root->SetHasRenderSurface(true);
 259   scoped_ptr<LayerImpl> layer_ptr =
 260       LayerImpl::Create(host_impl.active_tree(), 2);
 261   LayerImpl* layer = layer_ptr.get();
 262   root->AddChild(layer_ptr.Pass());
 263   layer->SetScrollClipLayer(root->id());
 264   DCHECK(host_impl.CanDraw());
 265
 266   gfx::PointF arbitrary_point_f = gfx::PointF(0.125f, 0.25f);
 267   float arbitrary_number = 0.352f;
 268   gfx::Size arbitrary_size = gfx::Size(111, 222);
 269   gfx::Point arbitrary_point = gfx::Point(333, 444);
 270   gfx::Vector2d arbitrary_vector2d = gfx::Vector2d(111, 222);
 271   gfx::Size large_size = gfx::Size(1000, 1000);
 272   gfx::Rect arbitrary_rect = gfx::Rect(arbitrary_point, arbitrary_size);
 273   gfx::RectF arbitrary_rect_f =
 274       gfx::RectF(arbitrary_point_f, gfx::SizeF(1.234f, 5.678f));
 275   SkColor arbitrary_color = SkColorSetRGB(10, 20, 30);
 276   gfx::Transform arbitrary_transform;
 277   arbitrary_transform.Scale3d(0.1f, 0.2f, 0.3f);
 278   FilterOperations arbitrary_filters;
 279   arbitrary_filters.Append(FilterOperation::CreateOpacityFilter(0.5f));
 280   SkXfermode::Mode arbitrary_blend_mode = SkXfermode::kMultiply_Mode;
 281
 282   // Render surface functions.
 283   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetHasRenderSurface(true));
 284   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetHasRenderSurface(true));
 285   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetHasRenderSurface(false));
 286   // Create a render surface, because we must have a render surface if we have
 287   // filters.
 288   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetHasRenderSurface(true));
 289
 290   // Related filter functions.
 291   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetFilters(arbitrary_filters));
 292   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetFilters(arbitrary_filters));
 293   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetFilters(FilterOperations()));
 294   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetFilters(arbitrary_filters));
 295
 296   // Related scrolling functions.
 297   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetBounds(large_size));
 298   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetBounds(large_size));
 299   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->ScrollBy(arbitrary_vector2d));
 300   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->ScrollBy(gfx::Vector2d()));
 301   layer->SetScrollDelta(gfx::Vector2d(0, 0));
 302   host_impl.ForcePrepareToDraw();
 303   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(
 304       layer->SetScrollDelta(arbitrary_vector2d));
 305   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 306       layer->SetScrollDelta(arbitrary_vector2d));
 307   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->PushScrollOffsetFromMainThread(
 308       gfx::ScrollOffset(arbitrary_vector2d)));
 309   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->PushScrollOffsetFromMainThread(
 310       gfx::ScrollOffset(arbitrary_vector2d)));
 311
 312   // Unrelated functions, always set to new values, always set needs update.
 313   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(
 314       layer->SetMaskLayer(LayerImpl::Create(host_impl.active_tree(), 4)));
 315   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetMasksToBounds(true));
 316   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetContentsOpaque(true));
 317   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(
 318       layer->SetReplicaLayer(LayerImpl::Create(host_impl.active_tree(), 5)));
 319   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetPosition(arbitrary_point_f));
 320   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetShouldFlattenTransform(false));
 321   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->Set3dSortingContextId(1));
 322
 323   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(
 324       layer->SetDoubleSided(false));  // constructor initializes it to "true".
 325   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetContentBounds(arbitrary_size));
 326   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(
 327       layer->SetContentsScale(arbitrary_number, arbitrary_number));
 328   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetDrawsContent(true));
 329   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(
 330       layer->SetBackgroundColor(arbitrary_color));
 331   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(
 332       layer->SetBackgroundFilters(arbitrary_filters));
 333   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetOpacity(arbitrary_number));
 334   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(
 335       layer->SetBlendMode(arbitrary_blend_mode));
 336   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetTransform(arbitrary_transform));
 337   VERIFY_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetBounds(arbitrary_size));
 338
 339   // Unrelated functions, set to the same values, no needs update.
 340   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 341       layer->SetIsRootForIsolatedGroup(true));
 342   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetFilters(arbitrary_filters));
 343   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetMasksToBounds(true));
 344   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetContentsOpaque(true));
 345   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetPosition(arbitrary_point_f));
 346   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->Set3dSortingContextId(1));
 347   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 348       layer->SetDoubleSided(false));  // constructor initializes it to "true".
 349   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 350       layer->SetContentBounds(arbitrary_size));
 351   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 352       layer->SetContentsScale(arbitrary_number, arbitrary_number));
 353   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetDrawsContent(true));
 354   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 355       layer->SetBackgroundColor(arbitrary_color));
 356   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 357       layer->SetBackgroundFilters(arbitrary_filters));
 358   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetOpacity(arbitrary_number));
 359   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 360       layer->SetBlendMode(arbitrary_blend_mode));
 361   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 362       layer->SetIsRootForIsolatedGroup(true));
 363   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(
 364       layer->SetTransform(arbitrary_transform));
 365   VERIFY_NO_NEEDS_UPDATE_DRAW_PROPERTIES(layer->SetBounds(arbitrary_size));
 366 }
 367
 368 TEST(LayerImplTest, SafeOpaqueBackgroundColor) {
 369   FakeImplProxy proxy;
 370   TestSharedBitmapManager shared_bitmap_manager;
 371   FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
 372   EXPECT_TRUE(host_impl.InitializeRenderer(FakeOutputSurface::Create3d()));
 373   scoped_ptr<LayerImpl> layer = LayerImpl::Create(host_impl.active_tree(), 1);
 374
 375   for (int contents_opaque = 0; contents_opaque < 2; ++contents_opaque) {
 376     for (int layer_opaque = 0; layer_opaque < 2; ++layer_opaque) {
 377       for (int host_opaque = 0; host_opaque < 2; ++host_opaque) {
 378         layer->SetContentsOpaque(!!contents_opaque);
 379         layer->SetBackgroundColor(layer_opaque ? SK_ColorRED
 380                                                : SK_ColorTRANSPARENT);
 381         host_impl.active_tree()->set_background_color(
 382             host_opaque ? SK_ColorRED : SK_ColorTRANSPARENT);
 383
 384         SkColor safe_color = layer->SafeOpaqueBackgroundColor();
 385         if (contents_opaque) {
 386           EXPECT_EQ(SkColorGetA(safe_color), 255u)
 387               << "Flags: " << contents_opaque << ", " << layer_opaque << ", "
 388               << host_opaque << "\n";
 389         } else {
 390           EXPECT_NE(SkColorGetA(safe_color), 255u)
 391               << "Flags: " << contents_opaque << ", " << layer_opaque << ", "
 392               << host_opaque << "\n";
 393         }
 394       }
 395     }
 396   }
 397 }
 398
 399 TEST(LayerImplTest, TransformInvertibility) {
 400   FakeImplProxy proxy;
 401   TestSharedBitmapManager shared_bitmap_manager;
 402   FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
 403
 404   scoped_ptr<LayerImpl> layer = LayerImpl::Create(host_impl.active_tree(), 1);
 405   EXPECT_TRUE(layer->transform().IsInvertible());
 406   EXPECT_TRUE(layer->transform_is_invertible());
 407
 408   gfx::Transform transform;
 409   transform.Scale3d(
 410       SkDoubleToMScalar(1.0), SkDoubleToMScalar(1.0), SkDoubleToMScalar(0.0));
 411   layer->SetTransform(transform);
 412   EXPECT_FALSE(layer->transform().IsInvertible());
 413   EXPECT_FALSE(layer->transform_is_invertible());
 414
 415   transform.MakeIdentity();
 416   transform.ApplyPerspectiveDepth(SkDoubleToMScalar(100.0));
 417   transform.RotateAboutZAxis(75.0);
 418   transform.RotateAboutXAxis(32.2);
 419   transform.RotateAboutZAxis(-75.0);
 420   transform.Translate3d(SkDoubleToMScalar(50.5),
 421                         SkDoubleToMScalar(42.42),
 422                         SkDoubleToMScalar(-100.25));
 423
 424   layer->SetTransform(transform);
 425   EXPECT_TRUE(layer->transform().IsInvertible());
 426   EXPECT_TRUE(layer->transform_is_invertible());
 427 }
 428
 429 class LayerImplScrollTest : public testing::Test {
 430  public:
 431   LayerImplScrollTest()
 432       : host_impl_(settings(), &proxy_, &shared_bitmap_manager_), root_id_(7) {
 433     host_impl_.active_tree()->SetRootLayer(
 434         LayerImpl::Create(host_impl_.active_tree(), root_id_));
 435     host_impl_.active_tree()->root_layer()->AddChild(
 436         LayerImpl::Create(host_impl_.active_tree(), root_id_ + 1));
 437     layer()->SetScrollClipLayer(root_id_);
 438     // Set the max scroll offset by noting that the root layer has bounds (1,1),
 439     // thus whatever bounds are set for the layer will be the max scroll
 440     // offset plus 1 in each direction.
 441     host_impl_.active_tree()->root_layer()->SetBounds(gfx::Size(1, 1));
 442     gfx::Vector2d max_scroll_offset(51, 81);
 443     layer()->SetBounds(gfx::Size(max_scroll_offset.x(), max_scroll_offset.y()));
 444   }
 445
 446   LayerImpl* layer() {
 447     return host_impl_.active_tree()->root_layer()->children()[0];
 448   }
 449
 450   LayerTreeHostImpl& host_impl() { return host_impl_; }
 451
 452   LayerTreeImpl* tree() { return host_impl_.active_tree(); }
 453
 454   LayerTreeSettings settings() {
 455     LayerTreeSettings settings;
 456     settings.use_pinch_virtual_viewport = true;
 457     return settings;
 458   }
 459
 460  private:
 461   FakeImplProxy proxy_;
 462   TestSharedBitmapManager shared_bitmap_manager_;
 463   FakeLayerTreeHostImpl host_impl_;
 464   int root_id_;
 465 };
 466
 467 TEST_F(LayerImplScrollTest, ScrollByWithZeroOffset) {
 468   // Test that LayerImpl::ScrollBy only affects ScrollDelta and total scroll
 469   // offset is bounded by the range [0, max scroll offset].
 470
 471   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->CurrentScrollOffset());
 472   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->BaseScrollOffset());
 473   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->ScrollDelta());
 474
 475   layer()->ScrollBy(gfx::Vector2dF(-100, 100));
 476   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 80), layer()->CurrentScrollOffset());
 477
 478   EXPECT_VECTOR_EQ(layer()->ScrollDelta(), layer()->CurrentScrollOffset());
 479   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->BaseScrollOffset());
 480
 481   layer()->ScrollBy(gfx::Vector2dF(100, -100));
 482   EXPECT_VECTOR_EQ(gfx::Vector2dF(50, 0), layer()->CurrentScrollOffset());
 483
 484   EXPECT_VECTOR_EQ(layer()->ScrollDelta(), layer()->CurrentScrollOffset());
 485   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->BaseScrollOffset());
 486 }
 487
 488 TEST_F(LayerImplScrollTest, ScrollByWithNonZeroOffset) {
 489   gfx::ScrollOffset scroll_offset(10, 5);
 490   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 491
 492   EXPECT_VECTOR_EQ(scroll_offset, layer()->CurrentScrollOffset());
 493   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 494   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->ScrollDelta());
 495
 496   layer()->ScrollBy(gfx::Vector2dF(-100, 100));
 497   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 80), layer()->CurrentScrollOffset());
 498
 499   EXPECT_VECTOR_EQ(
 500       gfx::ScrollOffsetWithDelta(scroll_offset, layer()->ScrollDelta()),
 501       layer()->CurrentScrollOffset());
 502   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 503
 504   layer()->ScrollBy(gfx::Vector2dF(100, -100));
 505   EXPECT_VECTOR_EQ(gfx::Vector2dF(50, 0), layer()->CurrentScrollOffset());
 506
 507   EXPECT_VECTOR_EQ(
 508       gfx::ScrollOffsetWithDelta(scroll_offset, layer()->ScrollDelta()),
 509       layer()->CurrentScrollOffset());
 510   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 511 }
 512
 513 class ScrollDelegateIgnore : public LayerImpl::ScrollOffsetDelegate {
 514  public:
 515   void SetCurrentScrollOffset(const gfx::ScrollOffset& new_value) override {
 516     last_attempted_set_offset_ = new_value;
 517   }
 518   gfx::ScrollOffset last_attempted_set_offset() const {
 519     return last_attempted_set_offset_;
 520   }
 521
 522   gfx::ScrollOffset GetCurrentScrollOffset() override {
 523     return gfx::ScrollOffset(fixed_offset_);
 524   }
 525   bool IsExternalFlingActive() const override { return false; }
 526   void Update() const override { }
 527
 528   void set_fixed_offset(const gfx::Vector2dF& fixed_offset) {
 529     fixed_offset_ = fixed_offset;
 530   }
 531
 532  private:
 533   gfx::ScrollOffset last_attempted_set_offset_;
 534   gfx::Vector2dF fixed_offset_;
 535 };
 536
 537 TEST_F(LayerImplScrollTest, ScrollByWithIgnoringDelegate) {
 538   gfx::ScrollOffset scroll_offset(10, 5);
 539   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 540
 541   EXPECT_VECTOR_EQ(scroll_offset, layer()->CurrentScrollOffset());
 542   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 543   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->ScrollDelta());
 544
 545   ScrollDelegateIgnore delegate;
 546   gfx::Vector2dF fixed_offset(32, 12);
 547   delegate.set_fixed_offset(fixed_offset);
 548   layer()->SetScrollOffsetDelegate(&delegate);
 549   layer()->RefreshFromScrollDelegate();
 550
 551   EXPECT_VECTOR_EQ(fixed_offset, layer()->CurrentScrollOffset());
 552   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 553
 554   layer()->ScrollBy(gfx::Vector2dF(-100, 100));
 555
 556   EXPECT_VECTOR_EQ(fixed_offset, layer()->CurrentScrollOffset());
 557   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 558
 559   layer()->SetScrollOffsetDelegate(nullptr);
 560
 561   EXPECT_VECTOR_EQ(fixed_offset, layer()->CurrentScrollOffset());
 562   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 563
 564   gfx::Vector2dF scroll_delta(1, 1);
 565   layer()->ScrollBy(scroll_delta);
 566
 567   EXPECT_VECTOR_EQ(fixed_offset + scroll_delta, layer()->CurrentScrollOffset());
 568   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 569 }
 570
 571 class ScrollDelegateAccept : public LayerImpl::ScrollOffsetDelegate {
 572  public:
 573   void SetCurrentScrollOffset(const gfx::ScrollOffset& new_value) override {
 574     current_offset_ = new_value;
 575   }
 576   gfx::ScrollOffset GetCurrentScrollOffset() override {
 577     return current_offset_;
 578   }
 579   bool IsExternalFlingActive() const override { return false; }
 580   void Update() const override { }
 581
 582  private:
 583   gfx::ScrollOffset current_offset_;
 584 };
 585
 586 TEST_F(LayerImplScrollTest, ScrollByWithAcceptingDelegate) {
 587   gfx::ScrollOffset scroll_offset(10, 5);
 588   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 589
 590   EXPECT_VECTOR_EQ(scroll_offset, layer()->CurrentScrollOffset());
 591   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 592   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->ScrollDelta());
 593
 594   ScrollDelegateAccept delegate;
 595   layer()->SetScrollOffsetDelegate(&delegate);
 596
 597   EXPECT_VECTOR_EQ(scroll_offset, layer()->CurrentScrollOffset());
 598   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 599   EXPECT_VECTOR_EQ(gfx::Vector2dF(), layer()->ScrollDelta());
 600
 601   layer()->ScrollBy(gfx::Vector2dF(-100, 100));
 602
 603   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 80), layer()->CurrentScrollOffset());
 604   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 605
 606   layer()->SetScrollOffsetDelegate(nullptr);
 607
 608   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 80), layer()->CurrentScrollOffset());
 609   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 610
 611   gfx::Vector2dF scroll_delta(1, 1);
 612   layer()->ScrollBy(scroll_delta);
 613
 614   EXPECT_VECTOR_EQ(gfx::Vector2dF(1, 80), layer()->CurrentScrollOffset());
 615   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 616 }
 617
 618 TEST_F(LayerImplScrollTest, ApplySentScrollsNoDelegate) {
 619   gfx::ScrollOffset scroll_offset(10, 5);
 620   gfx::Vector2dF scroll_delta(20.5f, 8.5f);
 621   gfx::Vector2d sent_scroll_delta(12, -3);
 622
 623   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 624   layer()->ScrollBy(sent_scroll_delta);
 625   layer()->PullDeltaForMainThread();
 626   layer()->SetCurrentScrollOffset(scroll_offset +
 627                                   gfx::ScrollOffset(scroll_delta));
 628
 629   EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(scroll_offset, scroll_delta),
 630                    layer()->CurrentScrollOffset());
 631   EXPECT_VECTOR_EQ(scroll_delta, layer()->ScrollDelta());
 632   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 633
 634   layer()->ApplySentScrollDeltasFromAbortedCommit();
 635
 636   EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(scroll_offset, scroll_delta),
 637                    layer()->CurrentScrollOffset());
 638   EXPECT_VECTOR_EQ(scroll_delta - sent_scroll_delta, layer()->ScrollDelta());
 639   EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(scroll_offset, sent_scroll_delta),
 640                    layer()->BaseScrollOffset());
 641 }
 642
 643 TEST_F(LayerImplScrollTest, ApplySentScrollsWithIgnoringDelegate) {
 644   gfx::ScrollOffset scroll_offset(10, 5);
 645   gfx::Vector2d sent_scroll_delta(12, -3);
 646   gfx::Vector2dF fixed_offset(32, 12);
 647
 648   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 649   layer()->ScrollBy(sent_scroll_delta);
 650   layer()->PullDeltaForMainThread();
 651   layer()->SetCurrentScrollOffset(scroll_offset);
 652   ScrollDelegateIgnore delegate;
 653   delegate.set_fixed_offset(fixed_offset);
 654   layer()->SetScrollOffsetDelegate(&delegate);
 655   layer()->RefreshFromScrollDelegate();
 656
 657   EXPECT_VECTOR_EQ(fixed_offset, layer()->CurrentScrollOffset());
 658   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 659
 660   layer()->ApplySentScrollDeltasFromAbortedCommit();
 661
 662   EXPECT_VECTOR_EQ(fixed_offset, delegate.last_attempted_set_offset());
 663
 664   EXPECT_VECTOR_EQ(fixed_offset, layer()->CurrentScrollOffset());
 665   EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(scroll_offset, sent_scroll_delta),
 666                    layer()->BaseScrollOffset());
 667 }
 668
 669 TEST_F(LayerImplScrollTest, ApplySentScrollsWithAcceptingDelegate) {
 670   gfx::ScrollOffset scroll_offset(10, 5);
 671   gfx::Vector2d sent_scroll_delta(12, -3);
 672   gfx::Vector2dF scroll_delta(20.5f, 8.5f);
 673
 674   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 675   layer()->ScrollBy(sent_scroll_delta);
 676   layer()->PullDeltaForMainThread();
 677   ScrollDelegateAccept delegate;
 678   layer()->SetScrollOffsetDelegate(&delegate);
 679   layer()->SetCurrentScrollOffset(scroll_offset +
 680                                   gfx::ScrollOffset(scroll_delta));
 681
 682   EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(scroll_offset, scroll_delta),
 683                    layer()->CurrentScrollOffset());
 684   EXPECT_VECTOR_EQ(scroll_offset, layer()->BaseScrollOffset());
 685
 686   layer()->ApplySentScrollDeltasFromAbortedCommit();
 687
 688   EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(scroll_offset, scroll_delta),
 689                    layer()->CurrentScrollOffset());
 690   EXPECT_VECTOR_EQ(gfx::ScrollOffsetWithDelta(scroll_offset, sent_scroll_delta),
 691                    layer()->BaseScrollOffset());
 692 }
 693
 694 TEST_F(LayerImplScrollTest, ScrollUserUnscrollableLayer) {
 695   gfx::ScrollOffset scroll_offset(10, 5);
 696   gfx::Vector2dF scroll_delta(20.5f, 8.5f);
 697
 698   layer()->set_user_scrollable_vertical(false);
 699   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 700   gfx::Vector2dF unscrolled = layer()->ScrollBy(scroll_delta);
 701
 702   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 8.5f), unscrolled);
 703   EXPECT_VECTOR_EQ(gfx::Vector2dF(30.5f, 5), layer()->CurrentScrollOffset());
 704 }
 705
 706 TEST_F(LayerImplScrollTest, PushPropertiesToMirrorsCurrentScrollOffset) {
 707   gfx::ScrollOffset scroll_offset(10, 5);
 708   gfx::Vector2dF scroll_delta(12, 18);
 709
 710   host_impl().CreatePendingTree();
 711
 712   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 713   gfx::Vector2dF unscrolled = layer()->ScrollBy(scroll_delta);
 714
 715   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 0), unscrolled);
 716   EXPECT_VECTOR_EQ(gfx::Vector2dF(22, 23), layer()->CurrentScrollOffset());
 717
 718   layer()->PullDeltaForMainThread();
 719
 720   scoped_ptr<LayerImpl> pending_layer = LayerImpl::Create(
 721       host_impl().sync_tree(), layer()->id(), layer()->synced_scroll_offset());
 722   pending_layer->PushScrollOffsetFromMainThread(layer()->CurrentScrollOffset());
 723
 724   pending_layer->PushPropertiesTo(layer());
 725
 726   EXPECT_VECTOR_EQ(gfx::Vector2dF(22, 23), layer()->CurrentScrollOffset());
 727   EXPECT_VECTOR_EQ(layer()->CurrentScrollOffset(),
 728                    pending_layer->CurrentScrollOffset());
 729 }
 730
 731 TEST_F(LayerImplScrollTest, SetNewScrollbarParameters) {
 732   gfx::ScrollOffset scroll_offset(10, 5);
 733   layer()->PushScrollOffsetFromMainThread(scroll_offset);
 734
 735   scoped_ptr<PaintedScrollbarLayerImpl> vertical_scrollbar(
 736       PaintedScrollbarLayerImpl::Create(tree(), 100, VERTICAL));
 737   vertical_scrollbar->SetScrollLayerAndClipLayerByIds(
 738       layer()->id(), tree()->root_layer()->id());
 739
 740   int expected_vertical_maximum =
 741       layer()->bounds().height() - tree()->root_layer()->bounds().height();
 742   EXPECT_EQ(expected_vertical_maximum, vertical_scrollbar->maximum());
 743   EXPECT_EQ(scroll_offset.y(), vertical_scrollbar->current_pos());
 744
 745   scoped_ptr<PaintedScrollbarLayerImpl> horizontal_scrollbar(
 746       PaintedScrollbarLayerImpl::Create(tree(), 101, HORIZONTAL));
 747   horizontal_scrollbar->SetScrollLayerAndClipLayerByIds(
 748       layer()->id(), tree()->root_layer()->id());
 749
 750   int expected_horizontal_maximum =
 751       layer()->bounds().width() - tree()->root_layer()->bounds().width();
 752   EXPECT_EQ(expected_horizontal_maximum, horizontal_scrollbar->maximum());
 753   EXPECT_EQ(scroll_offset.x(), horizontal_scrollbar->current_pos());
 754 }
 755
 756 class LayerImplScrollbarSyncTest : public testing::Test {
 757  public:
 758   enum {
 759     ROOT = 1,
 760     IV_CLIP = 2,
 761     PAGE = 3,
 762     IV_SCROLL = 4,
 763     SCROLLBAR = 5,
 764     OLD_ROOT = 6,
 765     OV_CLIP = 7,
 766     OV_SCROLL = 8,
 767   };
 768   enum TreeID {
 769     PENDING,
 770     ACTIVE
 771   };
 772
 773   LayerImplScrollbarSyncTest()
 774       : host_impl_(settings(), &proxy_, &shared_bitmap_manager_) {
 775     host_impl_.CreatePendingTree();
 776
 777     CreateLayers(host_impl_.pending_tree());
 778     CreateLayers(host_impl_.active_tree());
 779   }
 780
 781   void CreateLayers(LayerTreeImpl * tree) {
 782     tree->SetRootLayer(LayerImpl::Create(tree, ROOT));
 783     LayerImpl * root = tree->root_layer();
 784     ASSERT_TRUE(root != nullptr);
 785
 786     int hierarchy[] = {IV_CLIP, PAGE, IV_SCROLL, OLD_ROOT, OV_CLIP, OV_SCROLL};
 787     LayerImpl * parent = root;
 788     for (int child_id : hierarchy) {
 789       parent->AddChild(LayerImpl::Create(tree, child_id));
 790       parent = tree->LayerById(child_id);
 791       ASSERT_TRUE(parent != nullptr);
 792     }
 793
 794     root->AddChild(
 795         SolidColorScrollbarLayerImpl::Create(tree, SCROLLBAR, HORIZONTAL,
 796                                              5, 5, false, true));
 797   }
 798
 799   LayerImpl* layer(int id, TreeID tree_id) {
 800     LayerTreeImpl* tree =
 801         ((tree_id == PENDING) ?
 802          host_impl_.pending_tree() : host_impl_.active_tree());
 803
 804     assert(tree);
 805     return tree->LayerById(id);
 806   }
 807
 808   bool LayerHasScrollbar(int id, TreeID tree_id) {
 809     return layer(id, tree_id)->HasScrollbar(HORIZONTAL);
 810   }
 811
 812   ScrollbarLayerImplBase* pending_scrollbar() {
 813     LayerImpl* layer_impl = layer(SCROLLBAR, PENDING);
 814     assert(layer_impl);
 815     return layer_impl->ToScrollbarLayer();
 816   }
 817
 818   LayerImpl* pending_root() {
 819     LayerImpl * result = layer(ROOT, PENDING);
 820     assert(result);
 821     return result;
 822   }
 823
 824   LayerImpl* active_root() {
 825     LayerImpl * result = layer(ROOT, ACTIVE);
 826     assert(result);
 827     return result;
 828   }
 829
 830   LayerTreeSettings settings() {
 831     LayerTreeSettings settings;
 832     settings.use_pinch_virtual_viewport = true;
 833     return settings;
 834   }
 835
 836  private:
 837   FakeImplProxy proxy_;
 838   TestSharedBitmapManager shared_bitmap_manager_;
 839   FakeLayerTreeHostImpl host_impl_;
 840 };
 841
 842 TEST_F(LayerImplScrollbarSyncTest, LayerImplBecomesScrollable) {
 843   // In the beginning IV_SCROLL layer is not scrollable.
 844   ASSERT_FALSE(layer(IV_SCROLL, PENDING)->scrollable());
 845
 846   // For pinch virtual viewport the clip layer is the inner viewport
 847   // clip layer (IV_CLIP) and the scroll one is the outer viewport
 848   // scroll layer (OV_SCROLL).
 849   pending_scrollbar()->SetScrollLayerAndClipLayerByIds(OV_SCROLL, IV_CLIP);
 850
 851   ASSERT_TRUE(LayerHasScrollbar(OV_SCROLL, PENDING));
 852   ASSERT_TRUE(LayerHasScrollbar(IV_CLIP, PENDING));
 853
 854   // Synchronize with the active tree.
 855   TreeSynchronizer::PushProperties(pending_root(), active_root());
 856
 857   ASSERT_TRUE(LayerHasScrollbar(OV_SCROLL, ACTIVE));
 858   ASSERT_TRUE(LayerHasScrollbar(IV_CLIP, ACTIVE));
 859
 860   // Make IV_SCROLL layer scrollable.
 861   layer(IV_SCROLL, PENDING)->SetScrollClipLayer(IV_CLIP);
 862   layer(IV_SCROLL, PENDING)->SetNeedsPushProperties();
 863   ASSERT_TRUE(layer(IV_SCROLL, PENDING)->scrollable());
 864
 865   pending_scrollbar()->SetScrollLayerAndClipLayerByIds(OV_SCROLL, IV_CLIP);
 866
 867   // Now IV_CLIP layer should also receive the scrollbar.
 868   ASSERT_TRUE(LayerHasScrollbar(OV_SCROLL, PENDING));
 869   ASSERT_TRUE(LayerHasScrollbar(IV_CLIP, PENDING));
 870   ASSERT_TRUE(LayerHasScrollbar(IV_SCROLL, PENDING));
 871
 872   // Synchronize with the active tree.
 873   TreeSynchronizer::PushProperties(pending_root(), active_root());
 874
 875   ASSERT_TRUE(layer(IV_SCROLL, ACTIVE)->scrollable());
 876
 877   ASSERT_TRUE(LayerHasScrollbar(OV_SCROLL, ACTIVE));
 878   ASSERT_TRUE(LayerHasScrollbar(IV_CLIP, ACTIVE));
 879   ASSERT_TRUE(LayerHasScrollbar(IV_SCROLL, ACTIVE));
 880 }
 881
 882 }  // namespace
 883 }  // namespace cc