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 "cc/animation/scrollbar_animation_controller.h"
   7 #include "cc/layers/append_quads_data.h"
   8 #include "cc/layers/painted_scrollbar_layer.h"
   9 #include "cc/layers/painted_scrollbar_layer_impl.h"
  10 #include "cc/layers/scrollbar_layer_interface.h"
  11 #include "cc/layers/solid_color_scrollbar_layer.h"
  12 #include "cc/layers/solid_color_scrollbar_layer_impl.h"
  13 #include "cc/quads/solid_color_draw_quad.h"
  14 #include "cc/resources/resource_update_queue.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_web_graphics_context_3d.h"
  25 #include "cc/trees/layer_tree_host.h"
  26 #include "cc/trees/layer_tree_impl.h"
  27 #include "cc/trees/occlusion_tracker.h"
  28 #include "cc/trees/single_thread_proxy.h"
  29 #include "cc/trees/tree_synchronizer.h"
  30 #include "testing/gmock/include/gmock/gmock.h"
  31 #include "testing/gtest/include/gtest/gtest.h"
  32
  33 namespace cc {
  34 namespace {
  35
  36 LayerImpl* LayerImplForScrollAreaAndScrollbar(FakeLayerTreeHost* host,
  37                                               scoped_ptr<Scrollbar> scrollbar,
  38                                               bool reverse_order,
  39                                               bool use_solid_color_scrollbar,
  40                                               int thumb_thickness,
  41                                               int track_start) {
  42   scoped_refptr<Layer> layer_tree_root = Layer::Create();
  43   scoped_refptr<Layer> child1 = Layer::Create();
  44   scoped_refptr<Layer> child2;
  45   if (use_solid_color_scrollbar) {
  46     const bool kIsLeftSideVerticalScrollbar = false;
  47     child2 = SolidColorScrollbarLayer::Create(scrollbar->Orientation(),
  48                                               thumb_thickness,
  49                                               track_start,
  50                                               kIsLeftSideVerticalScrollbar,
  51                                               child1->id());
  52   } else {
  53     child2 = PaintedScrollbarLayer::Create(scrollbar.Pass(), child1->id());
  54   }
  55   child2->ToScrollbarLayer()->SetClipLayer(layer_tree_root->id());
  56   layer_tree_root->AddChild(child1);
  57   layer_tree_root->InsertChild(child2, reverse_order ? 0 : 1);
  58   host->SetRootLayer(layer_tree_root);
  59   return host->CommitAndCreateLayerImplTree();
  60 }
  61
  62 TEST(ScrollbarLayerTest, ResolveScrollLayerPointer) {
  63   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
  64   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
  65   LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
  66       host.get(), scrollbar.Pass(), false, false, 0, 0);
  67
  68   LayerImpl* cc_child1 = layer_impl_tree_root->children()[0];
  69   PaintedScrollbarLayerImpl* cc_child2 =
  70       static_cast<PaintedScrollbarLayerImpl*>(
  71           layer_impl_tree_root->children()[1]);
  72
  73   EXPECT_EQ(cc_child1->scrollbars()->size(), 1UL);
  74   EXPECT_EQ(*(cc_child1->scrollbars()->begin()), cc_child2);
  75 }
  76
  77 TEST(ScrollbarLayerTest, ResolveScrollLayerPointer_ReverseOrder) {
  78   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
  79   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
  80   LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
  81       host.get(), scrollbar.Pass(), true, false, 0, 0);
  82
  83   PaintedScrollbarLayerImpl* cc_child1 =
  84       static_cast<PaintedScrollbarLayerImpl*>(
  85           layer_impl_tree_root->children()[0]);
  86   LayerImpl* cc_child2 = layer_impl_tree_root->children()[1];
  87
  88   EXPECT_EQ(cc_child2->scrollbars()->size(), 1UL);
  89   EXPECT_EQ(*(cc_child2->scrollbars()->begin()), cc_child1);
  90 }
  91
  92 TEST(ScrollbarLayerTest, ShouldScrollNonOverlayOnMainThread) {
  93   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
  94
  95   // Create and attach a non-overlay scrollbar.
  96   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
  97   LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
  98       host.get(), scrollbar.Pass(), false, false, 0, 0);
  99   PaintedScrollbarLayerImpl* scrollbar_layer_impl =
 100       static_cast<PaintedScrollbarLayerImpl*>(
 101           layer_impl_tree_root->children()[1]);
 102
 103   // When the scrollbar is not an overlay scrollbar, the scroll should be
 104   // responded to on the main thread as the compositor does not yet implement
 105   // scrollbar scrolling.
 106   EXPECT_EQ(InputHandler::ScrollOnMainThread,
 107             scrollbar_layer_impl->TryScroll(gfx::Point(0, 0),
 108                                             InputHandler::Gesture));
 109
 110   // Create and attach an overlay scrollbar.
 111   scrollbar.reset(new FakeScrollbar(false, false, true));
 112
 113   layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
 114       host.get(), scrollbar.Pass(), false, false, 0, 0);
 115   scrollbar_layer_impl = static_cast<PaintedScrollbarLayerImpl*>(
 116       layer_impl_tree_root->children()[1]);
 117
 118   // The user shouldn't be able to drag an overlay scrollbar and the scroll
 119   // may be handled in the compositor.
 120   EXPECT_EQ(InputHandler::ScrollIgnored,
 121             scrollbar_layer_impl->TryScroll(gfx::Point(0, 0),
 122                                             InputHandler::Gesture));
 123 }
 124
 125 TEST(PaintedScrollbarLayerTest, ScrollOffsetSynchronization) {
 126   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
 127
 128   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
 129   scoped_refptr<Layer> layer_tree_root = Layer::Create();
 130   scoped_refptr<Layer> scroll_layer = Layer::Create();
 131   scoped_refptr<Layer> content_layer = Layer::Create();
 132   scoped_refptr<Layer> scrollbar_layer =
 133       PaintedScrollbarLayer::Create(scrollbar.Pass(), layer_tree_root->id());
 134
 135   // Choose bounds to give max_scroll_offset = (30, 50).
 136   layer_tree_root->SetBounds(gfx::Size(70, 150));
 137   scroll_layer->SetScrollClipLayerId(layer_tree_root->id());
 138   scroll_layer->SetScrollOffset(gfx::Vector2d(10, 20));
 139   scroll_layer->SetBounds(gfx::Size(100, 200));
 140   content_layer->SetBounds(gfx::Size(100, 200));
 141
 142   host->SetRootLayer(layer_tree_root);
 143   layer_tree_root->AddChild(scroll_layer);
 144   scroll_layer->AddChild(content_layer);
 145   layer_tree_root->AddChild(scrollbar_layer);
 146   scrollbar_layer->ToScrollbarLayer()->SetScrollLayer(scroll_layer->id());
 147   scrollbar_layer->ToScrollbarLayer()->SetClipLayer(layer_tree_root->id());
 148
 149   layer_tree_root->SavePaintProperties();
 150   content_layer->SavePaintProperties();
 151
 152   LayerImpl* layer_impl_tree_root = host->CommitAndCreateLayerImplTree();
 153
 154   ScrollbarLayerImplBase* cc_scrollbar_layer =
 155       static_cast<PaintedScrollbarLayerImpl*>(
 156           layer_impl_tree_root->children()[1]);
 157
 158   EXPECT_EQ(10.f, cc_scrollbar_layer->current_pos());
 159   EXPECT_EQ(30, cc_scrollbar_layer->maximum());
 160
 161   layer_tree_root->SetBounds(gfx::Size(700, 1500));
 162   layer_tree_root->SavePaintProperties();
 163   scroll_layer->SetBounds(gfx::Size(1000, 2000));
 164   scroll_layer->SetScrollOffset(gfx::Vector2d(100, 200));
 165   scroll_layer->SavePaintProperties();
 166   content_layer->SetBounds(gfx::Size(1000, 2000));
 167   content_layer->SavePaintProperties();
 168
 169   ScrollbarAnimationController* scrollbar_controller =
 170       layer_impl_tree_root->scrollbar_animation_controller();
 171   layer_impl_tree_root = host->CommitAndCreateLayerImplTree();
 172   EXPECT_EQ(scrollbar_controller,
 173             layer_impl_tree_root->scrollbar_animation_controller());
 174
 175   EXPECT_EQ(100.f, cc_scrollbar_layer->current_pos());
 176   EXPECT_EQ(300, cc_scrollbar_layer->maximum());
 177
 178   LayerImpl* scroll_layer_impl = layer_impl_tree_root->children()[0];
 179   scroll_layer_impl->ScrollBy(gfx::Vector2d(12, 34));
 180
 181   EXPECT_EQ(112.f, cc_scrollbar_layer->current_pos());
 182   EXPECT_EQ(300, cc_scrollbar_layer->maximum());
 183 }
 184
 185 #define UPDATE_AND_EXTRACT_LAYER_POINTERS()                         \
 186   do {                                                              \
 187     scrollbar_layer->UpdateThumbAndTrackGeometry();                 \
 188     root_clip_layer_impl = host->CommitAndCreateLayerImplTree();    \
 189     root_layer_impl = root_clip_layer_impl->children()[0];          \
 190     scrollbar_layer_impl = static_cast<PaintedScrollbarLayerImpl*>( \
 191         root_layer_impl->children()[1]);                            \
 192     scrollbar_layer_impl->ScrollbarParametersDidChange();           \
 193   } while (false)
 194
 195 TEST(ScrollbarLayerTest, ThumbRect) {
 196   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
 197   scoped_refptr<Layer> root_clip_layer = Layer::Create();
 198   scoped_refptr<Layer> root_layer = Layer::Create();
 199   scoped_refptr<Layer> content_layer = Layer::Create();
 200   scoped_refptr<FakePaintedScrollbarLayer> scrollbar_layer =
 201       FakePaintedScrollbarLayer::Create(false, true, root_layer->id());
 202
 203   root_layer->SetScrollClipLayerId(root_clip_layer->id());
 204   // Give the root-clip a size that will result in MaxScrollOffset = (80, 0).
 205   root_clip_layer->SetBounds(gfx::Size(20, 50));
 206   root_layer->SetBounds(gfx::Size(100, 50));
 207   content_layer->SetBounds(gfx::Size(100, 50));
 208
 209   host->SetRootLayer(root_clip_layer);
 210   root_clip_layer->AddChild(root_layer);
 211   root_layer->AddChild(content_layer);
 212   root_layer->AddChild(scrollbar_layer);
 213
 214   root_layer->SetScrollOffset(gfx::Vector2d(0, 0));
 215   scrollbar_layer->SetBounds(gfx::Size(70, 10));
 216   scrollbar_layer->SetScrollLayer(root_layer->id());
 217   scrollbar_layer->SetClipLayer(root_clip_layer->id());
 218   scrollbar_layer->fake_scrollbar()->set_location(gfx::Point(20, 10));
 219   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 10, 50, 10));
 220   scrollbar_layer->fake_scrollbar()->set_thumb_thickness(10);
 221   scrollbar_layer->fake_scrollbar()->set_thumb_length(4);
 222   scrollbar_layer->UpdateThumbAndTrackGeometry();
 223   LayerImpl* root_clip_layer_impl = NULL;
 224   LayerImpl* root_layer_impl = NULL;
 225   PaintedScrollbarLayerImpl* scrollbar_layer_impl = NULL;
 226
 227   // Thumb is at the edge of the scrollbar (should be inset to
 228   // the start of the track within the scrollbar layer's
 229   // position).
 230   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 231   EXPECT_EQ(gfx::Rect(10, 0, 4, 10).ToString(),
 232             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 233
 234   // Under-scroll (thumb position should clamp and be unchanged).
 235   root_layer->SetScrollOffset(gfx::Vector2d(-5, 0));
 236
 237   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 238   EXPECT_EQ(gfx::Rect(10, 0, 4, 10).ToString(),
 239             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 240
 241   // Over-scroll (thumb position should clamp on the far side).
 242   root_layer->SetScrollOffset(gfx::Vector2d(85, 0));
 243
 244   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 245   EXPECT_EQ(gfx::Rect(56, 0, 4, 10).ToString(),
 246             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 247
 248   // Change thumb thickness and length.
 249   scrollbar_layer->fake_scrollbar()->set_thumb_thickness(4);
 250   scrollbar_layer->fake_scrollbar()->set_thumb_length(6);
 251
 252   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 253   EXPECT_EQ(gfx::Rect(54, 0, 6, 4).ToString(),
 254             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 255
 256   // Shrink the scrollbar layer to cover only the track.
 257   scrollbar_layer->SetBounds(gfx::Size(50, 10));
 258   scrollbar_layer->fake_scrollbar()->set_location(gfx::Point(30, 10));
 259   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 10, 50, 10));
 260
 261   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 262   EXPECT_EQ(gfx::Rect(44, 0, 6, 4).ToString(),
 263             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 264
 265   // Shrink the track in the non-scrolling dimension so that it only covers the
 266   // middle third of the scrollbar layer (this does not affect the thumb
 267   // position).
 268   scrollbar_layer->fake_scrollbar()->set_track_rect(gfx::Rect(30, 12, 50, 6));
 269
 270   UPDATE_AND_EXTRACT_LAYER_POINTERS();
 271   EXPECT_EQ(gfx::Rect(44, 0, 6, 4).ToString(),
 272             scrollbar_layer_impl->ComputeThumbQuadRect().ToString());
 273 }
 274
 275 TEST(ScrollbarLayerTest, SolidColorDrawQuads) {
 276   const int kThumbThickness = 3;
 277   const int kTrackStart = 0;
 278   const int kTrackLength = 100;
 279
 280   LayerTreeSettings layer_tree_settings;
 281   scoped_ptr<FakeLayerTreeHost> host =
 282       FakeLayerTreeHost::Create(layer_tree_settings);
 283
 284   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, true));
 285   LayerImpl* layer_impl_tree_root = LayerImplForScrollAreaAndScrollbar(
 286       host.get(), scrollbar.Pass(), false, true, kThumbThickness, kTrackStart);
 287   ScrollbarLayerImplBase* scrollbar_layer_impl =
 288       static_cast<SolidColorScrollbarLayerImpl*>(
 289           layer_impl_tree_root->children()[1]);
 290   scrollbar_layer_impl->SetBounds(gfx::Size(kTrackLength, kThumbThickness));
 291   scrollbar_layer_impl->SetCurrentPos(10.f);
 292   scrollbar_layer_impl->SetMaximum(100);
 293   scrollbar_layer_impl->SetVisibleToTotalLengthRatio(0.4f);
 294
 295   // Thickness should be overridden to 3.
 296   {
 297     MockOcclusionTracker<LayerImpl> occlusion_tracker;
 298     scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 299     AppendQuadsData data;
 300     scrollbar_layer_impl->AppendQuads(
 301         render_pass.get(), occlusion_tracker, &data);
 302
 303     const QuadList& quads = render_pass->quad_list;
 304     ASSERT_EQ(1u, quads.size());
 305     EXPECT_EQ(DrawQuad::SOLID_COLOR, quads[0]->material);
 306     EXPECT_RECT_EQ(gfx::Rect(6, 0, 40, 3), quads[0]->rect);
 307   }
 308
 309   // Contents scale should scale the draw quad.
 310   scrollbar_layer_impl->draw_properties().contents_scale_x = 2.f;
 311   scrollbar_layer_impl->draw_properties().contents_scale_y = 2.f;
 312   {
 313     MockOcclusionTracker<LayerImpl> occlusion_tracker;
 314     scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 315     AppendQuadsData data;
 316     scrollbar_layer_impl->AppendQuads(
 317         render_pass.get(), occlusion_tracker, &data);
 318
 319     const QuadList& quads = render_pass->quad_list;
 320     ASSERT_EQ(1u, quads.size());
 321     EXPECT_EQ(DrawQuad::SOLID_COLOR, quads[0]->material);
 322     EXPECT_RECT_EQ(gfx::Rect(12, 0, 80, 6), quads[0]->rect);
 323   }
 324   scrollbar_layer_impl->draw_properties().contents_scale_x = 1.f;
 325   scrollbar_layer_impl->draw_properties().contents_scale_y = 1.f;
 326
 327   // For solid color scrollbars, position and size should reflect the
 328   // current viewport state.
 329   scrollbar_layer_impl->SetVisibleToTotalLengthRatio(0.2f);
 330   {
 331     MockOcclusionTracker<LayerImpl> occlusion_tracker;
 332     scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 333     AppendQuadsData data;
 334     scrollbar_layer_impl->AppendQuads(
 335         render_pass.get(), occlusion_tracker, &data);
 336
 337     const QuadList& quads = render_pass->quad_list;
 338     ASSERT_EQ(1u, quads.size());
 339     EXPECT_EQ(DrawQuad::SOLID_COLOR, quads[0]->material);
 340     EXPECT_RECT_EQ(gfx::Rect(8, 0, 20, 3), quads[0]->rect);
 341   }
 342 }
 343
 344 TEST(ScrollbarLayerTest, LayerDrivenSolidColorDrawQuads) {
 345   const int kThumbThickness = 3;
 346   const int kTrackStart = 0;
 347   const int kTrackLength = 10;
 348
 349   LayerTreeSettings layer_tree_settings;
 350   scoped_ptr<FakeLayerTreeHost> host =
 351       FakeLayerTreeHost::Create(layer_tree_settings);
 352
 353   scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, true));
 354
 355   {
 356     scoped_refptr<Layer> layer_tree_root = Layer::Create();
 357     scoped_refptr<Layer> scroll_layer = Layer::Create();
 358     scroll_layer->SetScrollClipLayerId(layer_tree_root->id());
 359     scoped_refptr<Layer> child1 = Layer::Create();
 360     scoped_refptr<Layer> child2;
 361     const bool kIsLeftSideVerticalScrollbar = false;
 362     child2 = SolidColorScrollbarLayer::Create(scrollbar->Orientation(),
 363                                               kThumbThickness,
 364                                               kTrackStart,
 365                                               kIsLeftSideVerticalScrollbar,
 366                                               child1->id());
 367     child2->ToScrollbarLayer()->SetScrollLayer(scroll_layer->id());
 368     child2->ToScrollbarLayer()->SetClipLayer(layer_tree_root->id());
 369     scroll_layer->AddChild(child1);
 370     scroll_layer->InsertChild(child2, 1);
 371     layer_tree_root->AddChild(scroll_layer);
 372     host->SetRootLayer(layer_tree_root);
 373   }
 374   LayerImpl* layer_impl_tree_root = host->CommitAndCreateLayerImplTree();
 375   LayerImpl* scroll_layer_impl = layer_impl_tree_root->children()[0];
 376
 377   ScrollbarLayerImplBase* scrollbar_layer_impl =
 378       static_cast<PaintedScrollbarLayerImpl*>(scroll_layer_impl->children()[1]);
 379
 380   // Choose layer bounds to give max_scroll_offset = (8, 8).
 381   layer_impl_tree_root->SetBounds(gfx::Size(2, 2));
 382   scroll_layer_impl->SetBounds(gfx::Size(10, 10));
 383   scroll_layer_impl->ScrollBy(gfx::Vector2dF(4.f, 0.f));
 384
 385   scrollbar_layer_impl->SetBounds(gfx::Size(kTrackLength, kThumbThickness));
 386   scrollbar_layer_impl->SetCurrentPos(4.f);
 387   scrollbar_layer_impl->SetMaximum(8);
 388
 389   {
 390     MockOcclusionTracker<LayerImpl> occlusion_tracker;
 391     scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 392
 393     AppendQuadsData data;
 394     scrollbar_layer_impl->AppendQuads(
 395         render_pass.get(), occlusion_tracker, &data);
 396
 397     const QuadList& quads = render_pass->quad_list;
 398     ASSERT_EQ(1u, quads.size());
 399     EXPECT_EQ(DrawQuad::SOLID_COLOR, quads[0]->material);
 400     EXPECT_RECT_EQ(gfx::Rect(3, 0, 3, 3), quads[0]->rect);
 401   }
 402 }
 403
 404 class ScrollbarLayerSolidColorThumbTest : public testing::Test {
 405  public:
 406   ScrollbarLayerSolidColorThumbTest() {
 407     LayerTreeSettings layer_tree_settings;
 408     host_impl_.reset(new FakeLayerTreeHostImpl(
 409         layer_tree_settings, &proxy_, &shared_bitmap_manager_));
 410
 411     const int kThumbThickness = 3;
 412     const int kTrackStart = 0;
 413     const bool kIsLeftSideVerticalScrollbar = false;
 414     const bool kIsOverlayScrollbar = false;
 415
 416     horizontal_scrollbar_layer_ =
 417         SolidColorScrollbarLayerImpl::Create(host_impl_->active_tree(),
 418                                              1,
 419                                              HORIZONTAL,
 420                                              kThumbThickness,
 421                                              kTrackStart,
 422                                              kIsLeftSideVerticalScrollbar,
 423                                              kIsOverlayScrollbar);
 424     vertical_scrollbar_layer_ =
 425         SolidColorScrollbarLayerImpl::Create(host_impl_->active_tree(),
 426                                              2,
 427                                              VERTICAL,
 428                                              kThumbThickness,
 429                                              kTrackStart,
 430                                              kIsLeftSideVerticalScrollbar,
 431                                              kIsOverlayScrollbar);
 432   }
 433
 434  protected:
 435   FakeImplProxy proxy_;
 436   TestSharedBitmapManager shared_bitmap_manager_;
 437   scoped_ptr<FakeLayerTreeHostImpl> host_impl_;
 438   scoped_ptr<SolidColorScrollbarLayerImpl> horizontal_scrollbar_layer_;
 439   scoped_ptr<SolidColorScrollbarLayerImpl> vertical_scrollbar_layer_;
 440 };
 441
 442 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbLength) {
 443   horizontal_scrollbar_layer_->SetCurrentPos(0);
 444   horizontal_scrollbar_layer_->SetMaximum(10);
 445
 446   // Simple case - one third of the scrollable area is visible, so the thumb
 447   // should be one third as long as the track.
 448   horizontal_scrollbar_layer_->SetVisibleToTotalLengthRatio(0.33f);
 449   horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
 450   EXPECT_EQ(33, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 451
 452   // The thumb's length should never be less than its thickness.
 453   horizontal_scrollbar_layer_->SetVisibleToTotalLengthRatio(0.01f);
 454   horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
 455   EXPECT_EQ(3, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 456 }
 457
 458 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbPosition) {
 459   horizontal_scrollbar_layer_->SetBounds(gfx::Size(100, 3));
 460   horizontal_scrollbar_layer_->SetVisibleToTotalLengthRatio(0.1f);
 461
 462   horizontal_scrollbar_layer_->SetCurrentPos(0);
 463   horizontal_scrollbar_layer_->SetMaximum(100);
 464   EXPECT_EQ(0, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
 465   EXPECT_EQ(10, horizontal_scrollbar_layer_->ComputeThumbQuadRect().width());
 466
 467   horizontal_scrollbar_layer_->SetCurrentPos(100);
 468   // The thumb is 10px long and the track is 100px, so the maximum thumb
 469   // position is 90px.
 470   EXPECT_EQ(90, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
 471
 472   horizontal_scrollbar_layer_->SetCurrentPos(80);
 473   // The scroll position is 80% of the maximum, so the thumb's position should
 474   // be at 80% of its maximum or 72px.
 475   EXPECT_EQ(72, horizontal_scrollbar_layer_->ComputeThumbQuadRect().x());
 476 }
 477
 478 TEST_F(ScrollbarLayerSolidColorThumbTest, SolidColorThumbVerticalAdjust) {
 479   SolidColorScrollbarLayerImpl* layers[2] =
 480       { horizontal_scrollbar_layer_.get(), vertical_scrollbar_layer_.get() };
 481   for (size_t i = 0; i < 2; ++i) {
 482     layers[i]->SetVisibleToTotalLengthRatio(0.2f);
 483     layers[i]->SetCurrentPos(25);
 484     layers[i]->SetMaximum(100);
 485   }
 486   layers[0]->SetBounds(gfx::Size(100, 3));
 487   layers[1]->SetBounds(gfx::Size(3, 100));
 488
 489   EXPECT_RECT_EQ(gfx::RectF(20.f, 0.f, 20.f, 3.f),
 490                  horizontal_scrollbar_layer_->ComputeThumbQuadRect());
 491   EXPECT_RECT_EQ(gfx::RectF(0.f, 20.f, 3.f, 20.f),
 492                  vertical_scrollbar_layer_->ComputeThumbQuadRect());
 493
 494   horizontal_scrollbar_layer_->SetVerticalAdjust(10.f);
 495   vertical_scrollbar_layer_->SetVerticalAdjust(10.f);
 496
 497   // The vertical adjustment factor has two effects:
 498   // 1.) Moves the horizontal scrollbar down
 499   // 2.) Increases the vertical scrollbar's effective track length which both
 500   // increases the thumb's length and its position within the track.
 501   EXPECT_RECT_EQ(gfx::Rect(20.f, 10.f, 20.f, 3.f),
 502                  horizontal_scrollbar_layer_->ComputeThumbQuadRect());
 503   EXPECT_RECT_EQ(gfx::Rect(0.f, 22, 3.f, 22.f),
 504                  vertical_scrollbar_layer_->ComputeThumbQuadRect());
 505 }
 506
 507 class ScrollbarLayerTestMaxTextureSize : public LayerTreeTest {
 508  public:
 509   ScrollbarLayerTestMaxTextureSize() {}
 510
 511   void SetScrollbarBounds(const gfx::Size& bounds) { bounds_ = bounds; }
 512
 513   virtual void BeginTest() OVERRIDE {
 514     scroll_layer_ = Layer::Create();
 515     layer_tree_host()->root_layer()->AddChild(scroll_layer_);
 516
 517     scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar);
 518     scrollbar_layer_ =
 519         PaintedScrollbarLayer::Create(scrollbar.Pass(), scroll_layer_->id());
 520     scrollbar_layer_->SetScrollLayer(scroll_layer_->id());
 521     scrollbar_layer_->SetLayerTreeHost(layer_tree_host());
 522     scrollbar_layer_->SetBounds(bounds_);
 523     layer_tree_host()->root_layer()->AddChild(scrollbar_layer_);
 524
 525     PostSetNeedsCommitToMainThread();
 526   }
 527
 528   virtual void DidCommitAndDrawFrame() OVERRIDE {
 529     const int kMaxTextureSize =
 530         layer_tree_host()->GetRendererCapabilities().max_texture_size;
 531
 532     // Check first that we're actually testing something.
 533     EXPECT_GT(scrollbar_layer_->bounds().width(), kMaxTextureSize);
 534
 535     EXPECT_EQ(scrollbar_layer_->content_bounds().width(),
 536               kMaxTextureSize - 1);
 537     EXPECT_EQ(scrollbar_layer_->content_bounds().height(),
 538               kMaxTextureSize - 1);
 539
 540     EndTest();
 541   }
 542
 543   virtual void AfterTest() OVERRIDE {}
 544
 545  private:
 546   scoped_refptr<PaintedScrollbarLayer> scrollbar_layer_;
 547   scoped_refptr<Layer> scroll_layer_;
 548   gfx::Size bounds_;
 549 };
 550
 551 TEST_F(ScrollbarLayerTestMaxTextureSize, DirectRenderer) {
 552   scoped_ptr<TestWebGraphicsContext3D> context =
 553       TestWebGraphicsContext3D::Create();
 554   int max_size = 0;
 555   context->getIntegerv(GL_MAX_TEXTURE_SIZE, &max_size);
 556   SetScrollbarBounds(gfx::Size(max_size + 100, max_size + 100));
 557   RunTest(true, false, true);
 558 }
 559
 560 TEST_F(ScrollbarLayerTestMaxTextureSize, DelegatingRenderer) {
 561   scoped_ptr<TestWebGraphicsContext3D> context =
 562       TestWebGraphicsContext3D::Create();
 563   int max_size = 0;
 564   context->getIntegerv(GL_MAX_TEXTURE_SIZE, &max_size);
 565   SetScrollbarBounds(gfx::Size(max_size + 100, max_size + 100));
 566   RunTest(true, true, true);
 567 }
 568
 569 class MockLayerTreeHost : public LayerTreeHost {
 570  public:
 571   MockLayerTreeHost(FakeLayerTreeHostClient* client,
 572                     const LayerTreeSettings& settings)
 573       : LayerTreeHost(client, NULL, settings),
 574         next_id_(1),
 575         total_ui_resource_created_(0),
 576         total_ui_resource_deleted_(0) {
 577     InitializeSingleThreaded(client);
 578   }
 579
 580   virtual UIResourceId CreateUIResource(UIResourceClient* content) OVERRIDE {
 581     total_ui_resource_created_++;
 582     UIResourceId nid = next_id_++;
 583     ui_resource_bitmap_map_.insert(
 584         std::make_pair(nid, content->GetBitmap(nid, false)));
 585     return nid;
 586   }
 587
 588   // Deletes a UI resource.  May safely be called more than once.
 589   virtual void DeleteUIResource(UIResourceId id) OVERRIDE {
 590     UIResourceBitmapMap::iterator iter = ui_resource_bitmap_map_.find(id);
 591     if (iter != ui_resource_bitmap_map_.end()) {
 592       ui_resource_bitmap_map_.erase(iter);
 593       total_ui_resource_deleted_++;
 594     }
 595   }
 596
 597   size_t UIResourceCount() { return ui_resource_bitmap_map_.size(); }
 598   int TotalUIResourceDeleted() { return total_ui_resource_deleted_; }
 599   int TotalUIResourceCreated() { return total_ui_resource_created_; }
 600
 601   gfx::Size ui_resource_size(UIResourceId id) {
 602     UIResourceBitmapMap::iterator iter = ui_resource_bitmap_map_.find(id);
 603     if (iter != ui_resource_bitmap_map_.end())
 604       return iter->second.GetSize();
 605     return gfx::Size();
 606   }
 607
 608   UIResourceBitmap* ui_resource_bitmap(UIResourceId id) {
 609     UIResourceBitmapMap::iterator iter = ui_resource_bitmap_map_.find(id);
 610     if (iter != ui_resource_bitmap_map_.end())
 611       return &iter->second;
 612     return NULL;
 613   }
 614
 615  private:
 616   typedef base::hash_map<UIResourceId, UIResourceBitmap>
 617       UIResourceBitmapMap;
 618   UIResourceBitmapMap ui_resource_bitmap_map_;
 619
 620   int next_id_;
 621   int total_ui_resource_created_;
 622   int total_ui_resource_deleted_;
 623 };
 624
 625
 626 class ScrollbarLayerTestResourceCreation : public testing::Test {
 627  public:
 628   ScrollbarLayerTestResourceCreation()
 629       : fake_client_(FakeLayerTreeHostClient::DIRECT_3D) {}
 630
 631   void TestResourceUpload(int num_updates,
 632                           size_t expected_resources,
 633                           int expected_created,
 634                           int expected_deleted,
 635                           bool use_solid_color_scrollbar) {
 636     layer_tree_host_.reset(
 637         new MockLayerTreeHost(&fake_client_, layer_tree_settings_));
 638
 639     scoped_ptr<Scrollbar> scrollbar(new FakeScrollbar(false, true, false));
 640     scoped_refptr<Layer> layer_tree_root = Layer::Create();
 641     scoped_refptr<Layer> content_layer = Layer::Create();
 642     scoped_refptr<Layer> scrollbar_layer;
 643     if (use_solid_color_scrollbar) {
 644       const int kThumbThickness = 3;
 645       const int kTrackStart = 0;
 646       const bool kIsLeftSideVerticalScrollbar = false;
 647       scrollbar_layer =
 648           SolidColorScrollbarLayer::Create(scrollbar->Orientation(),
 649                                            kThumbThickness,
 650                                            kTrackStart,
 651                                            kIsLeftSideVerticalScrollbar,
 652                                            layer_tree_root->id());
 653     } else {
 654       scrollbar_layer = PaintedScrollbarLayer::Create(scrollbar.Pass(),
 655                                                       layer_tree_root->id());
 656     }
 657     layer_tree_root->AddChild(content_layer);
 658     layer_tree_root->AddChild(scrollbar_layer);
 659
 660     layer_tree_host_->SetRootLayer(layer_tree_root);
 661
 662     scrollbar_layer->SetIsDrawable(true);
 663     scrollbar_layer->SetBounds(gfx::Size(100, 100));
 664     layer_tree_root->SetScrollOffset(gfx::Vector2d(10, 20));
 665     layer_tree_root->SetBounds(gfx::Size(100, 200));
 666     content_layer->SetBounds(gfx::Size(100, 200));
 667     scrollbar_layer->draw_properties().content_bounds = gfx::Size(100, 200);
 668     scrollbar_layer->draw_properties().visible_content_rect =
 669         gfx::Rect(0, 0, 100, 200);
 670     scrollbar_layer->CreateRenderSurface();
 671     scrollbar_layer->draw_properties().render_target = scrollbar_layer.get();
 672
 673     testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 674     EXPECT_EQ(scrollbar_layer->layer_tree_host(), layer_tree_host_.get());
 675
 676     ResourceUpdateQueue queue;
 677     gfx::Rect screen_space_clip_rect;
 678     OcclusionTracker<Layer> occlusion_tracker(screen_space_clip_rect);
 679
 680     scrollbar_layer->SavePaintProperties();
 681     for (int update_counter = 0; update_counter < num_updates; update_counter++)
 682       scrollbar_layer->Update(&queue, &occlusion_tracker);
 683
 684     // A non-solid-color scrollbar should have requested two textures.
 685     EXPECT_EQ(expected_resources, layer_tree_host_->UIResourceCount());
 686     EXPECT_EQ(expected_created, layer_tree_host_->TotalUIResourceCreated());
 687     EXPECT_EQ(expected_deleted, layer_tree_host_->TotalUIResourceDeleted());
 688
 689     testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 690
 691     scrollbar_layer->ClearRenderSurface();
 692   }
 693
 694  protected:
 695   FakeLayerTreeHostClient fake_client_;
 696   LayerTreeSettings layer_tree_settings_;
 697   scoped_ptr<MockLayerTreeHost> layer_tree_host_;
 698 };
 699
 700 TEST_F(ScrollbarLayerTestResourceCreation, ResourceUpload) {
 701   bool use_solid_color_scrollbars = false;
 702   TestResourceUpload(0, 0, 0, 0, use_solid_color_scrollbars);
 703   int num_updates[3] = {1, 5, 10};
 704   for (int j = 0; j < 3; j++) {
 705     TestResourceUpload(num_updates[j],
 706                        2,
 707                        num_updates[j] * 2,
 708                        (num_updates[j] - 1) * 2,
 709                        use_solid_color_scrollbars);
 710   }
 711 }
 712
 713 TEST_F(ScrollbarLayerTestResourceCreation, SolidColorNoResourceUpload) {
 714   bool use_solid_color_scrollbars = true;
 715   TestResourceUpload(0, 0, 0, 0, use_solid_color_scrollbars);
 716   TestResourceUpload(1, 0, 0, 0, use_solid_color_scrollbars);
 717 }
 718
 719 class ScaledScrollbarLayerTestResourceCreation : public testing::Test {
 720  public:
 721   ScaledScrollbarLayerTestResourceCreation()
 722       : fake_client_(FakeLayerTreeHostClient::DIRECT_3D) {}
 723
 724   void TestResourceUpload(const float test_scale) {
 725     layer_tree_host_.reset(
 726         new MockLayerTreeHost(&fake_client_, layer_tree_settings_));
 727
 728     gfx::Point scrollbar_location(0, 185);
 729     scoped_refptr<Layer> layer_tree_root = Layer::Create();
 730     scoped_refptr<Layer> content_layer = Layer::Create();
 731     scoped_refptr<FakePaintedScrollbarLayer> scrollbar_layer =
 732         FakePaintedScrollbarLayer::Create(false, true, layer_tree_root->id());
 733
 734     layer_tree_root->AddChild(content_layer);
 735     layer_tree_root->AddChild(scrollbar_layer);
 736
 737     layer_tree_host_->SetRootLayer(layer_tree_root);
 738
 739     scrollbar_layer->SetIsDrawable(true);
 740     scrollbar_layer->SetBounds(gfx::Size(100, 15));
 741     scrollbar_layer->SetPosition(scrollbar_location);
 742     layer_tree_root->SetBounds(gfx::Size(100, 200));
 743     content_layer->SetBounds(gfx::Size(100, 200));
 744     gfx::SizeF scaled_size =
 745         gfx::ScaleSize(scrollbar_layer->bounds(), test_scale, test_scale);
 746     gfx::PointF scaled_location =
 747         gfx::ScalePoint(scrollbar_layer->position(), test_scale, test_scale);
 748     scrollbar_layer->draw_properties().content_bounds =
 749         gfx::Size(scaled_size.width(), scaled_size.height());
 750     scrollbar_layer->draw_properties().contents_scale_x = test_scale;
 751     scrollbar_layer->draw_properties().contents_scale_y = test_scale;
 752     scrollbar_layer->draw_properties().visible_content_rect =
 753         gfx::Rect(scaled_location.x(),
 754                   scaled_location.y(),
 755                   scaled_size.width(),
 756                   scaled_size.height());
 757     scrollbar_layer->CreateRenderSurface();
 758     scrollbar_layer->draw_properties().render_target = scrollbar_layer.get();
 759
 760     testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 761     EXPECT_EQ(scrollbar_layer->layer_tree_host(), layer_tree_host_.get());
 762
 763     ResourceUpdateQueue queue;
 764     gfx::Rect screen_space_clip_rect;
 765     OcclusionTracker<Layer> occlusion_tracker(screen_space_clip_rect);
 766     scrollbar_layer->SavePaintProperties();
 767     scrollbar_layer->Update(&queue, &occlusion_tracker);
 768
 769     // Verify that we have not generated any content uploads that are larger
 770     // than their destination textures.
 771
 772     gfx::Size track_size = layer_tree_host_->ui_resource_size(
 773         scrollbar_layer->track_resource_id());
 774     gfx::Size thumb_size = layer_tree_host_->ui_resource_size(
 775         scrollbar_layer->thumb_resource_id());
 776
 777     EXPECT_LE(track_size.width(), scrollbar_layer->content_bounds().width());
 778     EXPECT_LE(track_size.height(), scrollbar_layer->content_bounds().height());
 779     EXPECT_LE(thumb_size.width(), scrollbar_layer->content_bounds().width());
 780     EXPECT_LE(thumb_size.height(), scrollbar_layer->content_bounds().height());
 781
 782     testing::Mock::VerifyAndClearExpectations(layer_tree_host_.get());
 783
 784     scrollbar_layer->ClearRenderSurface();
 785   }
 786
 787  protected:
 788   FakeLayerTreeHostClient fake_client_;
 789   LayerTreeSettings layer_tree_settings_;
 790   scoped_ptr<MockLayerTreeHost> layer_tree_host_;
 791 };
 792
 793 TEST_F(ScaledScrollbarLayerTestResourceCreation, ScaledResourceUpload) {
 794   // Pick a test scale that moves the scrollbar's (non-zero) position to
 795   // a non-pixel-aligned location.
 796   TestResourceUpload(.041f);
 797   TestResourceUpload(1.41f);
 798   TestResourceUpload(4.1f);
 799 }
 800
 801 class ScaledScrollbarLayerTestScaledRasterization : public testing::Test {
 802  public:
 803   ScaledScrollbarLayerTestScaledRasterization()
 804       : fake_client_(FakeLayerTreeHostClient::DIRECT_3D) {}
 805
 806   void TestScale(const gfx::Rect scrollbar_rect, const float test_scale) {
 807     layer_tree_host_.reset(
 808         new MockLayerTreeHost(&fake_client_, layer_tree_settings_));
 809
 810     bool paint_during_update = true;
 811     bool has_thumb = false;
 812     scoped_refptr<Layer> layer_tree_root = Layer::Create();
 813     scoped_refptr<FakePaintedScrollbarLayer> scrollbar_layer =
 814         FakePaintedScrollbarLayer::Create(paint_during_update,
 815                                           has_thumb,
 816                                           layer_tree_root->id());
 817
 818     layer_tree_root->AddChild(scrollbar_layer);
 819
 820     layer_tree_host_->SetRootLayer(layer_tree_root);
 821
 822     scrollbar_layer->SetBounds(scrollbar_rect.size());
 823     scrollbar_layer->SetPosition(scrollbar_rect.origin());
 824     scrollbar_layer->fake_scrollbar()->set_location(scrollbar_rect.origin());
 825     scrollbar_layer->fake_scrollbar()->set_track_rect(scrollbar_rect);
 826     gfx::SizeF scaled_size =
 827         gfx::ScaleSize(scrollbar_layer->bounds(), test_scale, test_scale);
 828     gfx::PointF scaled_location =
 829         gfx::ScalePoint(scrollbar_layer->position(), test_scale, test_scale);
 830     scrollbar_layer->draw_properties().content_bounds =
 831         gfx::Size(scaled_size.width(), scaled_size.height());
 832     scrollbar_layer->draw_properties().contents_scale_x = test_scale;
 833     scrollbar_layer->draw_properties().contents_scale_y = test_scale;
 834     scrollbar_layer->draw_properties().visible_content_rect =
 835         gfx::Rect(scaled_location.x(),
 836                   scaled_location.y(),
 837                   scaled_size.width(),
 838                   scaled_size.height());
 839
 840     ResourceUpdateQueue queue;
 841     gfx::Rect screen_space_clip_rect;
 842     OcclusionTracker<Layer> occlusion_tracker(screen_space_clip_rect);
 843     scrollbar_layer->SavePaintProperties();
 844
 845     scrollbar_layer->Update(&queue, &occlusion_tracker);
 846
 847     UIResourceBitmap* bitmap = layer_tree_host_->ui_resource_bitmap(
 848         scrollbar_layer->track_resource_id());
 849
 850     DCHECK(bitmap);
 851
 852     AutoLockUIResourceBitmap locked_bitmap(*bitmap);
 853
 854     const SkColor* pixels =
 855         reinterpret_cast<const SkColor*>(locked_bitmap.GetPixels());
 856     SkColor color = argb_to_skia(
 857         scrollbar_layer->fake_scrollbar()->paint_fill_color());
 858     int width = bitmap->GetSize().width();
 859     int height = bitmap->GetSize().height();
 860
 861     // Make sure none of the corners of the bitmap were inadvertently clipped.
 862     EXPECT_EQ(color, pixels[0])
 863         << "Top left pixel doesn't match scrollbar color.";
 864
 865     EXPECT_EQ(color, pixels[width - 1])
 866         << "Top right pixel doesn't match scrollbar color.";
 867
 868     EXPECT_EQ(color, pixels[width * (height - 1)])
 869         << "Bottom left pixel doesn't match scrollbar color.";
 870
 871     EXPECT_EQ(color, pixels[width * height - 1])
 872         << "Bottom right pixel doesn't match scrollbar color.";
 873   }
 874
 875  protected:
 876   // On Android, Skia uses ABGR
 877   static SkColor argb_to_skia(SkColor c) {
 878       return (SkColorGetA(c) << SK_A32_SHIFT) |
 879              (SkColorGetR(c) << SK_R32_SHIFT) |
 880              (SkColorGetG(c) << SK_G32_SHIFT) |
 881              (SkColorGetB(c) << SK_B32_SHIFT);
 882   }
 883
 884   FakeLayerTreeHostClient fake_client_;
 885   LayerTreeSettings layer_tree_settings_;
 886   scoped_ptr<MockLayerTreeHost> layer_tree_host_;
 887 };
 888
 889 TEST_F(ScaledScrollbarLayerTestScaledRasterization, TestLostPrecisionInClip) {
 890   // Try rasterization at coordinates and scale that caused problematic
 891   // rounding and clipping errors.
 892   // Vertical Scrollbars.
 893   TestScale(gfx::Rect(1240, 0, 15, 1333), 2.7754839f);
 894   TestScale(gfx::Rect(1240, 0, 15, 677), 2.46677136f);
 895
 896   // Horizontal Scrollbars.
 897   TestScale(gfx::Rect(0, 1240, 1333, 15), 2.7754839f);
 898   TestScale(gfx::Rect(0, 1240, 677, 15), 2.46677136f);
 899 }
 900
 901 }  // namespace
 902 }  // namespace cc