cc/layers/scrollbar_layer_unittest.cc

   1 // Copyright 2012 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 "base/containers/hash_tables.h"
   6 #include "base/thread_task_runner_handle.h"
   7 #include "cc/animation/scrollbar_animation_controller.h"
   8 #include "cc/layers/append_quads_data.h"
   9 #include "cc/layers/painted_scrollbar_layer.h"
  10 #include "cc/layers/painted_scrollbar_layer_impl.h"
  11 #include "cc/layers/scrollbar_layer_interface.h"
  12 #include "cc/layers/solid_color_scrollbar_layer.h"
  13 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
  14 #include "cc/quads/solid_color_draw_quad.h"
  15 #include "cc/test/fake_impl_proxy.h"
  16 #include "cc/test/fake_layer_tree_host.h"
  17 #include "cc/test/fake_layer_tree_host_client.h"
  18 #include "cc/test/fake_layer_tree_host_impl.h"
  19 #include "cc/test/fake_painted_scrollbar_layer.h"
  20 #include "cc/test/fake_scrollbar.h"
  21 #include "cc/test/geometry_test_utils.h"
  22 #include "cc/test/layer_tree_test.h"
  23 #include "cc/test/mock_occlusion_tracker.h"
  24 #include "cc/test/test_task_graph_runner.h"
  25 #include "cc/test/test_web_graphics_context_3d.h"
  26 #include "cc/trees/layer_tree_host.h"
  27 #include "cc/trees/layer_tree_impl.h"
  28 #include "cc/trees/occlusion_tracker.h"
  29 #include "cc/trees/single_thread_proxy.h"
  30 #include "cc/trees/tree_synchronizer.h"
  31 #include "testing/gmock/include/gmock/gmock.h"
  32 #include "testing/gtest/include/gtest/gtest.h"
  33
  34 namespace cc {
  35 namespace {
  36
  37 LayerImpl* LayerImplForScrollAreaAndScrollbar(const LayerSettings& settings,
  38                                               FakeLayerTreeHost* host,
  39                                               scoped_ptr<Scrollbar> scrollbar,
  40                                               bool reverse_order,
  41                                               bool use_solid_color_scrollbar,
  42                                               int thumb_thickness,
  43                                               int track_start) {
  44   scoped_refptr<Layer> layer_tree_root = Layer::Create(settings);
  45   scoped_refptr<Layer> child1 = Layer::Create(settings);
  46   scoped_refptr<Layer> child2;
  47   if (use_solid_color_scrollbar) {
  48     const bool kIsLeftSideVerticalScrollbar = false;
  49     child2 = SolidColorScrollbarLayer::Create(
  50         settings, scrollbar->Orientation(), thumb_thickness, track_start,
  51         kIsLeftSideVerticalScrollbar, child1->id());
  52   } else {
  53     child2 =
  54         PaintedScrollbarLayer::Create(settings, scrollbar.Pass(), child1->id());
  55   }
  56   child2->ToScrollbarLayer()->SetClipLayer(layer_tree_root->id());
  57   layer_tree_root->AddChild(child1);
  58   layer_tree_root->InsertChild(child2, reverse_order ? 0 : 1);
  59   host->SetRootLayer(layer_tree_root);
  60   return host->CommitAndCreateLayerImplTree();
  61 }
  62
  63 class FakeResourceTrackingLayerTreeHost : public FakeLayerTreeHost {
  64  public:
  65   FakeResourceTrackingLayerTreeHost(FakeLayerTreeHostClient* client,
  66                                     LayerTreeHost::InitParams* params)
  67       : FakeLayerTreeHost(client, params),
  68         next_id_(1),
  69         total_ui_resource_created_(0),
  70         total_ui_resource_deleted_(0) {
  71     InitializeSingleThreaded(client, base::ThreadTaskRunnerHandle::Get(),
  72                              nullptr);
  73   }
  74
  75   UIResourceId CreateUIResource(UIResourceClient* content) override {
  76     total_ui_resource_created_++;
  77     UIResourceId nid = next_id_++;
  78     ui_resource_bitmap_map_.insert(
  79         std::make_pair(nid, content->GetBitmap(nid, false)));
  80     return nid;
  81   }
  82
  83   // Deletes a UI resource.  May safely be called more than once.
  84   void DeleteUIResource(UIResourceId id) override {
  85     UIResourceBitmapMap::iterator iter = ui_resource_bitmap_map_.find(id);
  86     if (iter != ui_resource_bitmap_map_.end()) {
  87       ui_resource_bitmap_map_.erase(iter);
  88       total_ui_resource_deleted_++;
  89     }
  90   }
  91
  92   size_t UIResourceCount() { return ui_resource_bitmap_map_.size(); }
  93   int TotalUIResourceDeleted() { return total_ui_resource_deleted_; }
  94   int TotalUIResourceCreated() { return total_ui_resource_created_; }
  95
  96   gfx::Size ui_resource_size(UIResourceId id) {
  97     UIResourceBitmapMap::iterator iter = ui_resource_bitmap_map_.find(id);
  98     if (iter != ui_resource_bitmap_map_.end())
  99       return iter->second.GetSize();
 100     return gfx::Size();
 101   }
 102
 103   UIResourceBitmap* ui_resource_bitmap(UIResourceId id) {
 104     UIResourceBitmapMap::iterator iter = ui_resource_bitmap_map_.find(id);
 105     if (iter != ui_resource_bitmap_map_.end())
 106       return &iter->second;
 107     return nullptr;
 108   }
 109
 110  private:
 111   using UIResourceBitmapMap = base::hash_map<UIResourceId, UIResourceBitmap>;
 112   UIResourceBitmapMap ui_resource_bitmap_map_;
 113
 114   int next_id_;
 115   int total_ui_resource_created_;
 116   int total_ui_resource_deleted_;
 117 };
 118
 119 class ScrollbarLayerTest : public testing::Test {
 120  public:
 121   ScrollbarLayerTest() : fake_client_(FakeLayerTreeHostClient::DIRECT_3D) {
 122     layer_tree_settings_.single_thread_proxy_scheduler = false;
 123     layer_tree_settings_.use_zero_copy = true;
 124     layer_tree_settings_.use_one_copy = false;
 125
 126     LayerTreeHost::InitParams params;
 127     params.client = &fake_client_;
 128     params.settings = &layer_tree_settings_;
 129     params.task_graph_runner = &task_graph_runner_;
 130
 131     layer_tree_host_.reset(
 132         new FakeResourceTrackingLayerTreeHost(&fake_client_, &params));
 133     fake_client_.SetLayerTreeHost(layer_tree_host_.get());
 134     // Force output surface creation for renderer capabilities.
 135     layer_tree_host_->Composite(base::TimeTicks());
 136     EXPECT_FALSE(layer_tree_host_->output_surface_lost());
 137   }
 138
 139   const LayerSettings& layer_settings() { return layer_settings_; }
 140
 141  protected:
 142   FakeLayerTreeHostClient fake_client_;
 143   TestTaskGraphRunner task_graph_runner_;
 144   LayerTreeSettings layer_tree_settings_;
 145   LayerSettings layer_settings_;
 146   scoped_ptr<FakeResourceTrackingLayerTreeHost> layer_tree_host_;
 147 };
 148
 149 TEST_F(ScrollbarLayerTest, ResolveScrollLayerPointer) {
 150   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
 151   LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
 152       layer_settings(), layer_tree_host_.get(), scrollbar.Pass(), false, false,
 153       0, 0);
 154
 155   LayerImpl* cc_child1 = layer_impl_tree_root->children()[0];
 156   PaintedScrollbarLayerImpl* cc_child2 =
 157       static_cast<PaintedScrollbarLayerImpl*>(
 158           layer_impl_tree_root->children()[1]);
 159
 160   EXPECT_EQ(cc_child1->scrollbars()->size(), 1UL);
 161   EXPECT_EQ(*(cc_child1->scrollbars()->begin()), cc_child2);
 162 }
 163
 164 TEST_F(ScrollbarLayerTest, ResolveScrollLayerPointer_ReverseOrder) {
 165   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
 166   LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
 167       layer_settings(), layer_tree_host_.get(), scrollbar.Pass(), true, false,
 168       0, 0);
 169
 170   PaintedScrollbarLayerImpl* cc_child1 =
 171       static_cast<PaintedScrollbarLayerImpl*>(
 172           layer_impl_tree_root->children()[0]);
 173   LayerImpl* cc_child2 = layer_impl_tree_root->children()[1];
 174
 175   EXPECT_EQ(cc_child2->scrollbars()->size(), 1UL);
 176   EXPECT_EQ(*(cc_child2->scrollbars()->begin()), cc_child1);
 177 }
 178
 179 TEST_F(ScrollbarLayerTest, ShouldScrollNonOverlayOnMainThread) {
 180   // Create and attach a non-overlay scrollbar.
 181   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
 182   LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
 183       layer_settings(), layer_tree_host_.get(), scrollbar.Pass(), false, false,
 184       0, 0);
 185   PaintedScrollbarLayerImpl* scrollbar_layer_impl =
 186       static_cast<PaintedScrollbarLayerImpl*>(
 187           layer_impl_tree_root->children()[1]);
 188
 189   // When the scrollbar is not an overlay scrollbar, the scroll should be
 190   // responded to on the main thread as the compositor does not yet implement
 191   // scrollbar scrolling.
 192   EXPECT_EQ(
 193       InputHandler::SCROLL_ON_MAIN_THREAD,
 194       scrollbar_layer_impl->TryScroll(gfx::Point(0, 0), InputHandler::GESTURE,
 195                                       SCROLL_BLOCKS_ON_NONE));
 196
 197   // Create and attach an overlay scrollbar.
 198   scrollbar.reset(new FakeScrollbar(false, false, true));
 199
 200   layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
 201       layer_settings(), layer_tree_host_.get(), scrollbar.Pass(), false, false,
 202       0, 0);
 203   scrollbar_layer_impl = static_cast<PaintedScrollbarLayerImpl*>(
 204       layer_impl_tree_root->children()[1]);
 205
 206   // The user shouldn't be able to drag an overlay scrollbar and the scroll
 207   // may be handled in the compositor.
 208   EXPECT_EQ(
 209       InputHandler::SCROLL_IGNORED,
 210       scrollbar_layer_impl->TryScroll(gfx::Point(0, 0), InputHandler::GESTURE,
 211                                       SCROLL_BLOCKS_ON_NONE));
 212 }
 213
 214 TEST_F(ScrollbarLayerTest, ScrollOffsetSynchronization) {
 215   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
 216   scoped_refptr<Layer> layer_tree_root = Layer::Create(layer_settings());
 217   scoped_refptr<Layer> scroll_layer = Layer::Create(layer_settings());
 218   scoped_refptr<Layer> content_layer = Layer::Create(layer_settings());
 219   scoped_refptr<Layer> scrollbar_layer = PaintedScrollbarLayer::Create(
 220       layer_settings(), scrollbar.Pass(), layer_tree_root->id());
 221
 222   // Choose bounds to give max_scroll_offset = (30, 50).
 223   layer_tree_root->SetBounds(gfx::Size(70, 150));
 224   scroll_layer->SetScrollClipLayerId(layer_tree_root->id());
 225   scroll_layer->SetScrollOffset(gfx::ScrollOffset(10, 20));
 226   scroll_layer->SetBounds(gfx::Size(100, 200));
 227   content_layer->SetBounds(gfx::Size(100, 200));
 228
 229   layer_tree_host_->SetRootLayer(layer_tree_root);
 230   layer_tree_root->AddChild(scroll_layer);
 231   scroll_layer->AddChild(content_layer);
 232   layer_tree_root->AddChild(scrollbar_layer);
 233   scrollbar_layer->ToScrollbarLayer()->SetScrollLayer(scroll_layer->id());
 234   scrollbar_layer->ToScrollbarLayer()->SetClipLayer(layer_tree_root->id());
 235
 236   layer_tree_root->SavePaintProperties();
 237   content_layer->SavePaintProperties();
 238
 239   LayerImpl* layer_impl_tree_root =
 240       layer_tree_host_->CommitAndCreateLayerImplTree();
 241
 242   ScrollbarLayerImplBase* cc_scrollbar_layer =
 243       static_cast<PaintedScrollbarLayerImpl*>(
 244           layer_impl_tree_root->children()[1]);
 245
 246   EXPECT_EQ(10.f, cc_scrollbar_layer->current_pos());
 247   EXPECT_EQ(30, cc_scrollbar_layer->maximum());
 248
 249   layer_tree_root->SetBounds(gfx::Size(700, 1500));
 250   layer_tree_root->SavePaintProperties();
 251   scroll_layer->SetBounds(gfx::Size(1000, 2000));
 252   scroll_layer->SetScrollOffset(gfx::ScrollOffset(100, 200));
 253   scroll_layer->SavePaintProperties();
 254   content_layer->SetBounds(gfx::Size(1000, 2000));
 255   content_layer->SavePaintProperties();
 256
 257   ScrollbarAnimationController* scrollbar_controller =
 258       layer_impl_tree_root->scrollbar_animation_controller();
 259   layer_impl_tree_root = layer_tree_host_->CommitAndCreateLayerImplTree();
 260   EXPECT_EQ(scrollbar_controller,
 261             layer_impl_tree_root->scrollbar_animation_controller());
 262
 263   EXPECT_EQ(100.f, cc_scrollbar_layer->current_pos());
 264   EXPECT_EQ(300, cc_scrollbar_layer->maximum());
 265
 266   LayerImpl* scroll_layer_impl = layer_impl_tree_root->children()[0];
 267   scroll_layer_impl->ScrollBy(gfx::Vector2d(12, 34));
 268
 269   EXPECT_EQ(112.f, cc_scrollbar_layer->current_pos());
 270   EXPECT_EQ(300, cc_scrollbar_layer->maximum());
 271 }
 272
 273 #define UPDATE_AND_EXTRACT_LAYER_POINTERS()                                  \
 274   do {                                                                       \
 275     scrollbar_layer->UpdateInternalContentScale();                           \
 276     scrollbar_layer->UpdateThumbAndTrackGeometry();                          \
 277     root_clip_layer_impl = layer_tree_host_->CommitAndCreateLayerImplTree(); \
 278     root_layer_impl = root_clip_layer_impl->children()[0];                   \
 279     scrollbar_layer_impl = static_cast<PaintedScrollbarLayerImpl*>(          \
 280         root_layer_impl->children()[1]);                                     \
 281     scrollbar_layer_impl->ScrollbarParametersDidChange(false);               \
 282   } while (false)
 283
 284 TEST_F(ScrollbarLayerTest, UpdatePropertiesOfScrollBarWhenThumbRemoved) {
 285   scoped_refptr<Layer> root_clip_layer = Layer::Create(layer_settings());
 286   scoped_refptr<Layer> root_layer = Layer::Create(layer_settings());
 287   scoped_refptr<Layer> content_layer = Layer::Create(layer_settings());
 288   scoped_refptr<FakePaintedScrollbarLayer> scrollbar_layer =
 289       FakePaintedScrollbarLayer::Create(layer_settings(), false, true,
 290                                         root_layer->id());
 291
 292   root_layer->SetScrollClipLayerId(root_clip_layer->id());
 293   // Give the root-clip a size that will result in MaxScrollOffset = (80, 0).
 294   root_clip_layer->SetBounds(gfx::Size(20, 50));
 295   root_layer->SetBounds(gfx::Size(100, 50));
 296   content_layer->SetBounds(gfx::Size(100, 50));
 297
 298   layer_tree_host_->SetRootLayer(root_clip_layer);
 299   root_clip_layer->AddChild(root_layer);
 300   root_layer->AddChild(content_layer);
 301   root_layer->AddChild(scrollbar_layer);
 302
 303   root_layer->SetScrollOffset(gfx::ScrollOffset(0, 0));
 304   scrollbar_layer->SetBounds(gfx::Size(70, 10));
 305   scrollbar_layer->SetScrollLayer(root_layer->id());
 306   scrollbar_layer->SetClipLayer(root_clip_layer->id());
 307   scrollbar_layer->fake_scrollbar()->set_location(gfx::Point(20, 10));
 308   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 10, 50, 10));
 309   scrollbar_layer->fake_scrollbar()->set_thumb_thickness(10);
 310   scrollbar_layer->fake_scrollbar()->set_thumb_length(4);
 311   LayerImpl* root_clip_layer_impl = nullptr;
 312   LayerImpl* root_layer_impl = nullptr;
 313   PaintedScrollbarLayerImpl* scrollbar_layer_impl = nullptr;
 314
 315   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 316   EXPECT_EQ(gfx::Rect(10, 0, 4, 10).ToString(),
 317             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 318
 319   scrollbar_layer->fake_scrollbar()->set_has_thumb(false);
 320
 321   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 322   EXPECT_EQ(gfx::Rect(10, 0, 0, 0).ToString(),
 323             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 324 }
 325
 326 TEST_F(ScrollbarLayerTest, ThumbRect) {
 327   scoped_refptr<Layer> root_clip_layer = Layer::Create(layer_settings());
 328   scoped_refptr<Layer> root_layer = Layer::Create(layer_settings());
 329   scoped_refptr<Layer> content_layer = Layer::Create(layer_settings());
 330   scoped_refptr<FakePaintedScrollbarLayer> scrollbar_layer =
 331       FakePaintedScrollbarLayer::Create(layer_settings(), false, true,
 332                                         root_layer->id());
 333
 334   root_layer->SetScrollClipLayerId(root_clip_layer->id());
 335   // Give the root-clip a size that will result in MaxScrollOffset = (80, 0).
 336   root_clip_layer->SetBounds(gfx::Size(20, 50));
 337   root_layer->SetBounds(gfx::Size(100, 50));
 338   content_layer->SetBounds(gfx::Size(100, 50));
 339
 340   layer_tree_host_->SetRootLayer(root_clip_layer);
 341   root_clip_layer->AddChild(root_layer);
 342   root_layer->AddChild(content_layer);
 343   root_layer->AddChild(scrollbar_layer);
 344
 345   root_layer->SetScrollOffset(gfx::ScrollOffset(0, 0));
 346   scrollbar_layer->SetBounds(gfx::Size(70, 10));
 347   scrollbar_layer->SetScrollLayer(root_layer->id());
 348   scrollbar_layer->SetClipLayer(root_clip_layer->id());
 349   scrollbar_layer->fake_scrollbar()->set_location(gfx::Point(20, 10));
 350   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 10, 50, 10));
 351   scrollbar_layer->fake_scrollbar()->set_thumb_thickness(10);
 352   scrollbar_layer->fake_scrollbar()->set_thumb_length(4);
 353   LayerImpl* root_clip_layer_impl = nullptr;
 354   LayerImpl* root_layer_impl = nullptr;
 355   PaintedScrollbarLayerImpl* scrollbar_layer_impl = nullptr;
 356
 357   // Thumb is at the edge of the scrollbar (should be inset to
 358   // the start of the track within the scrollbar layer's
 359   // position).
 360   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 361   EXPECT_EQ(gfx::Rect(10, 0, 4, 10).ToString(),
 362             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 363
 364   // Under-scroll (thumb position should clamp and be unchanged).
 365   root_layer->SetScrollOffset(gfx::ScrollOffset(-5, 0));
 366
 367   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 368   EXPECT_EQ(gfx::Rect(10, 0, 4, 10).ToString(),
 369             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 370
 371   // Over-scroll (thumb position should clamp on the far side).
 372   root_layer->SetScrollOffset(gfx::ScrollOffset(85, 0));
 373
 374   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 375   EXPECT_EQ(gfx::Rect(56, 0, 4, 10).ToString(),
 376             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 377
 378   // Change thumb thickness and length.
 379   scrollbar_layer->fake_scrollbar()->set_thumb_thickness(4);
 380   scrollbar_layer->fake_scrollbar()->set_thumb_length(6);
 381
 382   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 383   EXPECT_EQ(gfx::Rect(54, 0, 6, 4).ToString(),
 384             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 385
 386   // Shrink the scrollbar layer to cover only the track.
 387   scrollbar_layer->SetBounds(gfx::Size(50, 10));
 388   scrollbar_layer->fake_scrollbar()->set_location(gfx::Point(30, 10));
 389   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 10, 50, 10));
 390
 391   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 392   EXPECT_EQ(gfx::Rect(44, 0, 6, 4).ToString(),
 393             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 394
 395   // Shrink the track in the non-scrolling dimension so that it only covers the
 396   // middle third of the scrollbar layer (this does not affect the thumb
 397   // position).
 398   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 12, 50, 6));
 399
 400   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 401   EXPECT_EQ(gfx::Rect(44, 0, 6, 4).ToString(),
 402             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 403 }
 404
 405 TEST_F(ScrollbarLayerTest, SolidColorDrawQuads) {
 406   const int kThumbThickness = 3;
 407   const int kTrackStart = 1;
 408   const int kTrackLength = 100;
 409
 410   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, true));
 411   LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
 412       layer_settings(), layer_tree_host_.get(), scrollbar.Pass(), false, true,
 413       kThumbThickness, kTrackStart);
 414   ScrollbarLayerImplBase* scrollbar_layer_impl =
 415       static_cast<SolidColorScrollbarLayerImpl*>(
 416           layer_impl_tree_root->children()[1]);
 417   scrollbar_layer_impl->SetBounds(gfx::Size(kTrackLength, kThumbThickness));
 418   scrollbar_layer_impl->SetCurrentPos(10.f);
 419   scrollbar_layer_impl->SetMaximum(100);
 420   scrollbar_layer_impl->SetVisibleToTotalLengthRatio(0.4f);
 421
 422   // Thickness should be overridden to 3.
 423   {
 424     scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 425     AppendQuadsData data;
 426     scrollbar_layer_impl->AppendQuads(render_pass.get(), &data);
 427
 428     const QuadList& quads = render_pass->quad_list;
 429     ASSERT_EQ(1u, quads.size());
 430     EXPECT_EQ(DrawQuad::SOLID_COLOR, quads.front()->material);
 431     EXPECT_EQ(gfx::Rect(6, 0, 39, 3), quads.front()->rect);
 432   }
 433
 434   // For solid color scrollbars, position and size should reflect the
 435   // current viewport state.
 436   scrollbar_layer_impl->SetVisibleToTotalLengthRatio(0.2f);
 437   {
 438     scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 439     AppendQuadsData data;
 440     scrollbar_layer_impl->AppendQuads(render_pass.get(), &data);
 441
 442     const QuadList& quads = render_pass->quad_list;
 443     ASSERT_EQ(1u, quads.size());
 444     EXPECT_EQ(DrawQuad::SOLID_COLOR, quads.front()->material);
 445     EXPECT_EQ(gfx::Rect(8, 0, 19, 3), quads.front()->rect);
 446   }
 447
 448   // We shouldn't attempt div-by-zero when the maximum is zero.
 449   scrollbar_layer_impl->SetCurrentPos(0.f);
 450   scrollbar_layer_impl->SetMaximum(0);
 451   {
 452     scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 453     AppendQuadsData data;
 454     scrollbar_layer_impl->AppendQuads(render_pass.get(), &data);
 455
 456     const QuadList& quads = render_pass->quad_list;
 457     ASSERT_EQ(1u, quads.size());
 458     EXPECT_EQ(DrawQuad::SOLID_COLOR, quads.front()->material);
 459     EXPECT_EQ(gfx::Rect(1, 0, 19, 3), quads.front()->rect);
 460   }
 461 }
 462
 463 TEST_F(ScrollbarLayerTest, LayerDrivenSolidColorDrawQuads) {
 464   const int kThumbThickness = 3;
 465   const int kTrackStart = 0;
 466   const int kTrackLength = 10;
 467
 468   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, true));
 469
 470   {
 471     scoped_refptr<Layer> layer_tree_root = Layer::Create(layer_settings());
 472     scoped_refptr<Layer> scroll_layer = Layer::Create(layer_settings());
 473     scroll_layer->SetScrollClipLayerId(layer_tree_root->id());
 474     scoped_refptr<Layer> child1 = Layer::Create(layer_settings());
 475     scoped_refptr<Layer> child2;
 476     const bool kIsLeftSideVerticalScrollbar = false;
 477     child2 = SolidColorScrollbarLayer::Create(
 478         layer_settings(), scrollbar->Orientation(), kThumbThickness,
 479         kTrackStart, kIsLeftSideVerticalScrollbar, child1->id());
 480     child2->ToScrollbarLayer()->SetScrollLayer(scroll_layer->id());
 481     child2->ToScrollbarLayer()->SetClipLayer(layer_tree_root->id());
 482     scroll_layer->AddChild(child1);
 483     scroll_layer->InsertChild(child2, 1);
 484     layer_tree_root->AddChild(scroll_layer);
 485     layer_tree_host_->SetRootLayer(layer_tree_root);
 486   }
 487   LayerImpl* layer_impl_tree_root =
 488       layer_tree_host_->CommitAndCreateLayerImplTree();
 489   LayerImpl* scroll_layer_impl = layer_impl_tree_root->children()[0];
 490
 491   auto* scrollbar_layer_impl =
 492       static_cast<ScrollbarLayerImplBase*>(scroll_layer_impl->children()[1]);
 493
 494   // Choose layer bounds to give max_scroll_offset = (8, 8).
 495   layer_impl_tree_root->SetBounds(gfx::Size(2, 2));
 496   scroll_layer_impl->SetBounds(gfx::Size(10, 10));
 497   scroll_layer_impl->ScrollBy(gfx::Vector2dF(4.f, 0.f));
 498
 499   scrollbar_layer_impl->SetBounds(gfx::Size(kTrackLength, kThumbThickness));
 500   scrollbar_layer_impl->SetCurrentPos(4.f);
 501   scrollbar_layer_impl->SetMaximum(8);
 502
 503   {
 504     scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 505
 506     AppendQuadsData data;
 507     scrollbar_layer_impl->AppendQuads(render_pass.get(), &data);
 508
 509     const QuadList& quads = render_pass->quad_list;
 510     ASSERT_EQ(1u, quads.size());
 511     EXPECT_EQ(DrawQuad::SOLID_COLOR, quads.front()->material);
 512     EXPECT_EQ(gfx::Rect(3, 0, 3, 3), quads.front()->rect);
 513   }
 514 }
 515
 516 class ScrollbarLayerSolidColorThumbTest : public testing::Test {
 517  public:
 518   ScrollbarLayerSolidColorThumbTest() {
 519     LayerTreeSettings layer_tree_settings;
 520     host_impl_.reset(new FakeLayerTreeHostImpl(layer_tree_settings, &proxy_,
 521                                                &shared_bitmap_manager_,
 522                                                &task_graph_runner_));
 523
 524     const int kThumbThickness = 3;
 525     const int kTrackStart = 0;
 526     const bool kIsLeftSideVerticalScrollbar = false;
 527     const bool kIsOverlayScrollbar = false;
 528
 529     horizontal_scrollbar_layer_ =
 530         SolidColorScrollbarLayerImpl::Create(host_impl_->active_tree(),
 531                                              1,
 532                                              HORIZONTAL,
 533                                              kThumbThickness,
 534                                              kTrackStart,
 535                                              kIsLeftSideVerticalScrollbar,
 536                                              kIsOverlayScrollbar);
 537     vertical_scrollbar_layer_ =
 538         SolidColorScrollbarLayerImpl::Create(host_impl_->active_tree(),
 539                                              2,
 540                                              VERTICAL,
 541                                              kThumbThickness,
 542                                              kTrackStart,
 543                                              kIsLeftSideVerticalScrollbar,
 544                                              kIsOverlayScrollbar);
 545   }
 546
 547  protected:
 548   FakeImplProxy proxy_;
 549   TestSharedBitmapManager shared_bitmap_manager_;
 550   TestTaskGraphRunner task_graph_runner_;
 551   scoped_ptr<FakeLayerTreeHostImpl> host_impl_;
 552   scoped_ptr<SolidColorScrollbarLayerImpl> horizontal_scrollbar_layer_;
 553   scoped_ptr<SolidColorScrollbarLayerImpl> vertical_scrollbar_layer_;
 554 };
 555
 556 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbLength) {
 557   horizontal_scrollbar_layer_->SetCurrentPos(0);
 558   horizontal_scrollbar_layer_->SetMaximum(10);
 559
 560   // Simple case - one third of the scrollable area is visible, so the thumb
 561   // should be one third as long as the track.
 562   horizontal_scrollbar_layer_->SetVisibleToTotalLengthRatio(0.33f);
 563   horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
 564   EXPECT_EQ(33, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 565
 566   // The thumb's length should never be less than its thickness.
 567   horizontal_scrollbar_layer_->SetVisibleToTotalLengthRatio(0.01f);
 568   horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
 569   EXPECT_EQ(3, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 570 }
 571
 572 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbPosition) {
 573   horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
 574   horizontal_scrollbar_layer_->SetVisibleToTotalLengthRatio(0.1f);
 575
 576   horizontal_scrollbar_layer_->SetCurrentPos(0);
 577   horizontal_scrollbar_layer_->SetMaximum(100);
 578   EXPECT_EQ(0, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
 579   EXPECT_EQ(10, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 580
 581   horizontal_scrollbar_layer_->SetCurrentPos(100);
 582   // The thumb is 10px long and the track is 100px, so the maximum thumb
 583   // position is 90px.
 584   EXPECT_EQ(90, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
 585
 586   horizontal_scrollbar_layer_->SetCurrentPos(80);
 587   // The scroll position is 80% of the maximum, so the thumb's position should
 588   // be at 80% of its maximum or 72px.
 589   EXPECT_EQ(72, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
 590 }
 591
 592 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbVerticalAdjust) {
 593   SolidColorScrollbarLayerImpl* layers[2] =
 594       { horizontal_scrollbar_layer_.get(), vertical_scrollbar_layer_.get() };
 595   for (size_t i = 0; i < 2; ++i) {
 596     layers[i]->SetVisibleToTotalLengthRatio(0.2f);
 597     layers[i]->SetCurrentPos(25);
 598     layers[i]->SetMaximum(100);
 599   }
 600   layers[0]->SetBounds(gfx::Size(100, 3));
 601   layers[1]->SetBounds(gfx::Size(3, 100));
 602
 603   EXPECT_EQ(gfx::RectF(20.f, 0.f, 20.f, 3.f),
 604             horizontal_scrollbar_layer_->ComputeThumbQuadRect());
 605   EXPECT_EQ(gfx::RectF(0.f, 20.f, 3.f, 20.f),
 606             vertical_scrollbar_layer_->ComputeThumbQuadRect());
 607
 608   horizontal_scrollbar_layer_->SetVerticalAdjust(10.f);
 609   vertical_scrollbar_layer_->SetVerticalAdjust(10.f);
 610
 611   // The vertical adjustment factor has two effects:
 612   // 1.) Moves the horizontal scrollbar down
 613   // 2.) Increases the vertical scrollbar's effective track length which both
 614   // increases the thumb's length and its position within the track.
 615   EXPECT_EQ(gfx::Rect(20.f, 10.f, 20.f, 3.f),
 616             horizontal_scrollbar_layer_->ComputeThumbQuadRect());
 617   EXPECT_EQ(gfx::Rect(0.f, 22, 3.f, 22.f),
 618             vertical_scrollbar_layer_->ComputeThumbQuadRect());
 619 }
 620
 621 class ScrollbarLayerTestMaxTextureSize : public LayerTreeTest {
 622  public:
 623   ScrollbarLayerTestMaxTextureSize() {}
 624
 625   void SetScrollbarBounds(const gfx::Size& bounds) { bounds_ = bounds; }
 626
 627   void BeginTest() override {
 628     scroll_layer_ = Layer::Create(layer_settings());
 629     layer_tree_host()->root_layer()->AddChild(scroll_layer_);
 630
 631     scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
 632     scrollbar_layer_ = PaintedScrollbarLayer::Create(
 633         layer_settings(), scrollbar.Pass(), scroll_layer_->id());
 634     scrollbar_layer_->SetScrollLayer(scroll_layer_->id());
 635     scrollbar_layer_->SetLayerTreeHost(layer_tree_host());
 636     scrollbar_layer_->SetBounds(bounds_);
 637     scrollbar_layer_->SetIsDrawable(true);
 638     layer_tree_host()->root_layer()->AddChild(scrollbar_layer_);
 639
 640     PostSetNeedsCommitToMainThread();
 641   }
 642
 643   void DidCommitAndDrawFrame() override {
 644     const int kMaxTextureSize =
 645         layer_tree_host()->GetRendererCapabilities().max_texture_size;
 646
 647     // Check first that we're actually testing something.
 648     EXPECT_GT(scrollbar_layer_->bounds().width(), kMaxTextureSize);
 649
 650     EXPECT_EQ(scrollbar_layer_->internal_content_bounds().width(),
 651               kMaxTextureSize - 1);
 652     EXPECT_EQ(scrollbar_layer_->internal_content_bounds().height(),
 653               kMaxTextureSize - 1);
 654
 655     EndTest();
 656   }
 657
 658   void AfterTest() override {}
 659
 660  private:
 661   scoped_refptr<PaintedScrollbarLayer> scrollbar_layer_;
 662   scoped_refptr<Layer> scroll_layer_;
 663   gfx::Size bounds_;
 664 };
 665
 666 TEST_F(ScrollbarLayerTestMaxTextureSize, DirectRenderer) {
 667   scoped_ptr<TestWebGraphicsContext3D> context =
 668       TestWebGraphicsContext3D::Create();
 669   int max_size = 0;
 670   context->getIntegerv(GL_MAX_TEXTURE_SIZE, &max_size);
 671   SetScrollbarBounds(gfx::Size(max_size + 100, max_size + 100));
 672   RunTest(true, false);
 673 }
 674
 675 TEST_F(ScrollbarLayerTestMaxTextureSize, DelegatingRenderer) {
 676   scoped_ptr<TestWebGraphicsContext3D> context =
 677       TestWebGraphicsContext3D::Create();
 678   int max_size = 0;
 679   context->getIntegerv(GL_MAX_TEXTURE_SIZE, &max_size);
 680   SetScrollbarBounds(gfx::Size(max_size + 100, max_size + 100));
 681   RunTest(true, true);
 682 }
 683
 684 class ScrollbarLayerTestResourceCreationAndRelease : public ScrollbarLayerTest {
 685  public:
 686   void TestResourceUpload(int num_updates,
 687                           size_t expected_resources,
 688                           int expected_created,
 689                           int expected_deleted,
 690                           bool use_solid_color_scrollbar) {
 691     scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, false));
 692     scoped_refptr<Layer> layer_tree_root = Layer::Create(layer_settings());
 693     scoped_refptr<Layer> content_layer = Layer::Create(layer_settings());
 694     scoped_refptr<Layer> scrollbar_layer;
 695     if (use_solid_color_scrollbar) {
 696       const int kThumbThickness = 3;
 697       const int kTrackStart = 0;
 698       const bool kIsLeftSideVerticalScrollbar = false;
 699       scrollbar_layer = SolidColorScrollbarLayer::Create(
 700           layer_settings(), scrollbar->Orientation(), kThumbThickness,
 701           kTrackStart, kIsLeftSideVerticalScrollbar, layer_tree_root->id());
 702     } else {
 703       scrollbar_layer = PaintedScrollbarLayer::Create(
 704           layer_settings(), scrollbar.Pass(), layer_tree_root->id());
 705     }
 706     layer_tree_root->AddChild(content_layer);
 707     layer_tree_root->AddChild(scrollbar_layer);
 708
 709     layer_tree_host_->SetRootLayer(layer_tree_root);
 710
 711     scrollbar_layer->SetIsDrawable(true);
 712     scrollbar_layer->SetBounds(gfx::Size(100, 100));
 713     layer_tree_root->SetScrollOffset(gfx::ScrollOffset(10, 20));
 714     layer_tree_root->SetBounds(gfx::Size(100, 200));
 715     content_layer->SetBounds(gfx::Size(100, 200));
 716     scrollbar_layer->draw_properties().visible_layer_rect =
 717         gfx::Rect(0, 0, 100, 200);
 718     scrollbar_layer->CreateRenderSurface();
 719     scrollbar_layer->draw_properties().render_target = scrollbar_layer.get();
 720
 721     testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 722     EXPECT_EQ(scrollbar_layer->layer_tree_host(), layer_tree_host_.get());
 723
 724     scrollbar_layer->SavePaintProperties();
 725     for (int update_counter = 0; update_counter < num_updates; update_counter++)
 726       scrollbar_layer->Update();
 727
 728     // A non-solid-color scrollbar should have requested two textures.
 729     EXPECT_EQ(expected_resources, layer_tree_host_->UIResourceCount());
 730     EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 731     EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 732
 733     testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 734
 735     scrollbar_layer->ClearRenderSurface();
 736   }
 737 };
 738
 739 TEST_F(ScrollbarLayerTestResourceCreationAndRelease, ResourceUpload) {
 740   bool use_solid_color_scrollbars = false;
 741   TestResourceUpload(0, 0, 0, 0, use_solid_color_scrollbars);
 742   int num_updates[3] = {1, 5, 10};
 743   int created = 0;
 744   int deleted = 0;
 745   for (int j = 0; j < 3; j++) {
 746     created += num_updates[j] * 2;
 747     deleted = created - 2;
 748     TestResourceUpload(num_updates[j], 2, created, deleted,
 749                        use_solid_color_scrollbars);
 750   }
 751 }
 752
 753 TEST_F(ScrollbarLayerTestResourceCreationAndRelease,
 754        SolidColorNoResourceUpload) {
 755   bool use_solid_color_scrollbars = true;
 756   TestResourceUpload(0, 0, 0, 0, use_solid_color_scrollbars);
 757   TestResourceUpload(1, 0, 0, 0, use_solid_color_scrollbars);
 758 }
 759
 760 TEST_F(ScrollbarLayerTestResourceCreationAndRelease, TestResourceUpdate) {
 761   gfx::Point scrollbar_location(0, 185);
 762   scoped_refptr<Layer> layer_tree_root = Layer::Create(layer_settings());
 763   scoped_refptr<Layer> content_layer = Layer::Create(layer_settings());
 764   scoped_refptr<FakePaintedScrollbarLayer> scrollbar_layer =
 765       FakePaintedScrollbarLayer::Create(layer_settings(), false, true,
 766                                         layer_tree_root->id());
 767
 768   layer_tree_root->AddChild(content_layer);
 769   layer_tree_root->AddChild(scrollbar_layer);
 770
 771   layer_tree_host_->SetRootLayer(layer_tree_root);
 772
 773   scrollbar_layer->SetIsDrawable(true);
 774   scrollbar_layer->SetBounds(gfx::Size(100, 15));
 775   scrollbar_layer->SetPosition(scrollbar_location);
 776   layer_tree_root->SetBounds(gfx::Size(100, 200));
 777   content_layer->SetBounds(gfx::Size(100, 200));
 778
 779   scrollbar_layer->draw_properties().visible_layer_rect =
 780       gfx::Rect(0, 0, 100, 200);
 781
 782   scrollbar_layer->CreateRenderSurface();
 783   scrollbar_layer->draw_properties().render_target = scrollbar_layer.get();
 784
 785   testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 786   EXPECT_EQ(scrollbar_layer->layer_tree_host(), layer_tree_host_.get());
 787
 788   size_t resource_count;
 789   int expected_created, expected_deleted;
 790   scrollbar_layer->SavePaintProperties();
 791
 792   resource_count = 2;
 793   expected_created = 2;
 794   expected_deleted = 0;
 795   EXPECT_TRUE(scrollbar_layer->Update());
 796   EXPECT_NE(0, scrollbar_layer->track_resource_id());
 797   EXPECT_NE(0, scrollbar_layer->thumb_resource_id());
 798   EXPECT_EQ(resource_count, layer_tree_host_->UIResourceCount());
 799   EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 800   EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 801
 802   resource_count = 0;
 803   expected_created = 2;
 804   expected_deleted = 2;
 805   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(0, 0, 0, 0));
 806   EXPECT_TRUE(scrollbar_layer->Update());
 807   EXPECT_EQ(0, scrollbar_layer->track_resource_id());
 808   EXPECT_EQ(0, scrollbar_layer->thumb_resource_id());
 809   EXPECT_EQ(resource_count, layer_tree_host_->UIResourceCount());
 810   EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 811   EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 812
 813   resource_count = 0;
 814   expected_created = 2;
 815   expected_deleted = 2;
 816   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(0, 0, 0, 0));
 817   EXPECT_FALSE(scrollbar_layer->Update());
 818   EXPECT_EQ(0, scrollbar_layer->track_resource_id());
 819   EXPECT_EQ(0, scrollbar_layer->thumb_resource_id());
 820   EXPECT_EQ(resource_count, layer_tree_host_->UIResourceCount());
 821   EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 822   EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 823
 824   resource_count = 2;
 825   expected_created = 4;
 826   expected_deleted = 2;
 827   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 10, 50, 10));
 828   EXPECT_TRUE(scrollbar_layer->Update());
 829   EXPECT_NE(0, scrollbar_layer->track_resource_id());
 830   EXPECT_NE(0, scrollbar_layer->thumb_resource_id());
 831   EXPECT_EQ(resource_count, layer_tree_host_->UIResourceCount());
 832   EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 833   EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 834
 835   resource_count = 1;
 836   expected_created = 5;
 837   expected_deleted = 4;
 838   scrollbar_layer->fake_scrollbar()->set_has_thumb(false);
 839   EXPECT_TRUE(scrollbar_layer->Update());
 840   EXPECT_NE(0, scrollbar_layer->track_resource_id());
 841   EXPECT_EQ(0, scrollbar_layer->thumb_resource_id());
 842   EXPECT_EQ(resource_count, layer_tree_host_->UIResourceCount());
 843   EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 844   EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 845
 846   resource_count = 0;
 847   expected_created = 5;
 848   expected_deleted = 5;
 849   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(0, 0, 0, 0));
 850   EXPECT_TRUE(scrollbar_layer->Update());
 851   EXPECT_EQ(0, scrollbar_layer->track_resource_id());
 852   EXPECT_EQ(0, scrollbar_layer->thumb_resource_id());
 853   EXPECT_EQ(resource_count, layer_tree_host_->UIResourceCount());
 854   EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 855   EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 856
 857   resource_count = 2;
 858   expected_created = 7;
 859   expected_deleted = 5;
 860   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 10, 50, 10));
 861   scrollbar_layer->fake_scrollbar()->set_has_thumb(true);
 862   EXPECT_TRUE(scrollbar_layer->Update());
 863   EXPECT_NE(0, scrollbar_layer->track_resource_id());
 864   EXPECT_NE(0, scrollbar_layer->thumb_resource_id());
 865
 866   resource_count = 1;
 867   expected_created = 8;
 868   expected_deleted = 7;
 869   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 10, 50, 10));
 870   scrollbar_layer->fake_scrollbar()->set_has_thumb(false);
 871   scrollbar_layer->SetBounds(gfx::Size(90, 15));
 872   EXPECT_TRUE(scrollbar_layer->Update());
 873   EXPECT_EQ(resource_count, layer_tree_host_->UIResourceCount());
 874   EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 875   EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 876   EXPECT_EQ(
 877       gfx::Size(90, 15),
 878       layer_tree_host_->ui_resource_size(scrollbar_layer->track_resource_id()));
 879
 880   scrollbar_layer->ResetNeedsDisplayForTesting();
 881   EXPECT_FALSE(scrollbar_layer->Update());
 882   EXPECT_NE(0, scrollbar_layer->track_resource_id());
 883   EXPECT_EQ(0, scrollbar_layer->thumb_resource_id());
 884   EXPECT_EQ(resource_count, layer_tree_host_->UIResourceCount());
 885   EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 886   EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 887
 888   testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 889   scrollbar_layer->ClearRenderSurface();
 890 }
 891
 892 class ScaledScrollbarLayerTestResourceCreation : public ScrollbarLayerTest {
 893  public:
 894   void TestResourceUpload(const float test_scale) {
 895     gfx::Point scrollbar_location(0, 185);
 896     scoped_refptr<Layer> layer_tree_root = Layer::Create(layer_settings());
 897     scoped_refptr<Layer> content_layer = Layer::Create(layer_settings());
 898     scoped_refptr<FakePaintedScrollbarLayer> scrollbar_layer =
 899         FakePaintedScrollbarLayer::Create(layer_settings(), false, true,
 900                                           layer_tree_root->id());
 901
 902     layer_tree_root->AddChild(content_layer);
 903     layer_tree_root->AddChild(scrollbar_layer);
 904
 905     layer_tree_host_->SetRootLayer(layer_tree_root);
 906
 907     scrollbar_layer->SetIsDrawable(true);
 908     scrollbar_layer->SetBounds(gfx::Size(100, 15));
 909     scrollbar_layer->SetPosition(scrollbar_location);
 910     layer_tree_root->SetBounds(gfx::Size(100, 200));
 911     content_layer->SetBounds(gfx::Size(100, 200));
 912     scrollbar_layer->draw_properties().visible_layer_rect =
 913         gfx::Rect(scrollbar_location, scrollbar_layer->bounds());
 914     scrollbar_layer->CreateRenderSurface();
 915     scrollbar_layer->draw_properties().render_target = scrollbar_layer.get();
 916
 917     testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 918     EXPECT_EQ(scrollbar_layer->layer_tree_host(), layer_tree_host_.get());
 919
 920     layer_tree_host_->SetDeviceScaleFactor(test_scale);
 921
 922     scrollbar_layer->SavePaintProperties();
 923     scrollbar_layer->Update();
 924
 925     // Verify that we have not generated any content uploads that are larger
 926     // than their destination textures.
 927
 928     gfx::Size track_size = layer_tree_host_->ui_resource_size(
 929         scrollbar_layer->track_resource_id());
 930     gfx::Size thumb_size = layer_tree_host_->ui_resource_size(
 931         scrollbar_layer->thumb_resource_id());
 932
 933     EXPECT_LE(track_size.width(),
 934               scrollbar_layer->internal_content_bounds().width());
 935     EXPECT_LE(track_size.height(),
 936               scrollbar_layer->internal_content_bounds().height());
 937     EXPECT_LE(thumb_size.width(),
 938               scrollbar_layer->internal_content_bounds().width());
 939     EXPECT_LE(thumb_size.height(),
 940               scrollbar_layer->internal_content_bounds().height());
 941
 942     testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 943
 944     scrollbar_layer->ClearRenderSurface();
 945   }
 946 };
 947
 948 TEST_F(ScaledScrollbarLayerTestResourceCreation, ScaledResourceUpload) {
 949   // Pick a test scale that moves the scrollbar's (non-zero) position to
 950   // a non-pixel-aligned location.
 951   TestResourceUpload(.041f);
 952   TestResourceUpload(1.41f);
 953   TestResourceUpload(4.1f);
 954 }
 955
 956 class ScaledScrollbarLayerTestScaledRasterization : public ScrollbarLayerTest {
 957  public:
 958   void TestScale(const gfx::Rect scrollbar_rect, const float test_scale) {
 959     bool paint_during_update = true;
 960     bool has_thumb = false;
 961     scoped_refptr<Layer> layer_tree_root = Layer::Create(layer_settings());
 962     scoped_refptr<FakePaintedScrollbarLayer> scrollbar_layer =
 963         FakePaintedScrollbarLayer::Create(layer_settings(), paint_during_update,
 964                                           has_thumb, layer_tree_root->id());
 965
 966     layer_tree_root->AddChild(scrollbar_layer);
 967
 968     layer_tree_host_->SetRootLayer(layer_tree_root);
 969
 970     scrollbar_layer->SetBounds(scrollbar_rect.size());
 971     scrollbar_layer->SetPosition(scrollbar_rect.origin());
 972     scrollbar_layer->fake_scrollbar()->set_location(scrollbar_rect.origin());
 973     scrollbar_layer->fake_scrollbar()->set_track_rect(scrollbar_rect);
 974     scrollbar_layer->draw_properties().visible_layer_rect = scrollbar_rect;
 975
 976     layer_tree_host_->SetDeviceScaleFactor(test_scale);
 977
 978     gfx::Rect screen_space_clip_rect;
 979     scrollbar_layer->SavePaintProperties();
 980
 981     scrollbar_layer->Update();
 982
 983     UIResourceBitmap* bitmap = layer_tree_host_->ui_resource_bitmap(
 984         scrollbar_layer->track_resource_id());
 985
 986     DCHECK(bitmap);
 987
 988     AutoLockUIResourceBitmap locked_bitmap(*bitmap);
 989
 990     const SkColor* pixels =
 991         reinterpret_cast<const SkColor*>(locked_bitmap.GetPixels());
 992     SkColor color = argb_to_skia(
 993         scrollbar_layer->fake_scrollbar()->paint_fill_color());
 994     int width = bitmap->GetSize().width();
 995     int height = bitmap->GetSize().height();
 996
 997     // Make sure none of the corners of the bitmap were inadvertently clipped.
 998     EXPECT_EQ(color, pixels[0])
 999         << "Top left pixel doesn't match scrollbar color.";
1000
1001     EXPECT_EQ(color, pixels[width - 1])
1002         << "Top right pixel doesn't match scrollbar color.";
1003
1004     EXPECT_EQ(color, pixels[width * (height - 1)])
1005         << "Bottom left pixel doesn't match scrollbar color.";
1006
1007     EXPECT_EQ(color, pixels[width * height - 1])
1008         << "Bottom right pixel doesn't match scrollbar color.";
1009   }
1010
1011  protected:
1012   // On Android, Skia uses ABGR
1013   static SkColor argb_to_skia(SkColor c) {
1014       return (SkColorGetA(c) << SK_A32_SHIFT) |
1015              (SkColorGetR(c) << SK_R32_SHIFT) |
1016              (SkColorGetG(c) << SK_G32_SHIFT) |
1017              (SkColorGetB(c) << SK_B32_SHIFT);
1018   }
1019 };
1020
1021 TEST_F(ScaledScrollbarLayerTestScaledRasterization, TestLostPrecisionInClip) {
1022   // Try rasterization at coordinates and scale that caused problematic
1023   // rounding and clipping errors.
1024   // Vertical Scrollbars.
1025   TestScale(gfx::Rect(1240, 0, 15, 1333), 2.7754839f);
1026   TestScale(gfx::Rect(1240, 0, 15, 677), 2.46677136f);
1027
1028   // Horizontal Scrollbars.
1029   TestScale(gfx::Rect(0, 1240, 1333, 15), 2.7754839f);
1030   TestScale(gfx::Rect(0, 1240, 677, 15), 2.46677136f);
1031 }
1032
1033 }  // namespace
1034 }  // namespace cc