src/cc/trees/layer_tree_host.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/trees/layer_tree_host.h"
   6
   7 #include <algorithm>
   8 #include <stack>
   9 #include <string>
  10
  11 #include "base/atomic_sequence_num.h"
  12 #include "base/bind.h"
  13 #include "base/command_line.h"
  14 #include "base/debug/trace_event.h"
  15 #include "base/debug/trace_event_argument.h"
  16 #include "base/message_loop/message_loop.h"
  17 #include "base/metrics/histogram.h"
  18 #include "base/stl_util.h"
  19 #include "base/strings/string_number_conversions.h"
  20 #include "cc/animation/animation_registrar.h"
  21 #include "cc/animation/layer_animation_controller.h"
  22 #include "cc/base/math_util.h"
  23 #include "cc/debug/devtools_instrumentation.h"
  24 #include "cc/debug/rendering_stats_instrumentation.h"
  25 #include "cc/input/layer_selection_bound.h"
  26 #include "cc/input/top_controls_manager.h"
  27 #include "cc/layers/heads_up_display_layer.h"
  28 #include "cc/layers/heads_up_display_layer_impl.h"
  29 #include "cc/layers/layer.h"
  30 #include "cc/layers/layer_iterator.h"
  31 #include "cc/layers/painted_scrollbar_layer.h"
  32 #include "cc/layers/render_surface.h"
  33 #include "cc/resources/prioritized_resource_manager.h"
  34 #include "cc/resources/ui_resource_request.h"
  35 #include "cc/trees/layer_tree_host_client.h"
  36 #include "cc/trees/layer_tree_host_common.h"
  37 #include "cc/trees/layer_tree_host_impl.h"
  38 #include "cc/trees/layer_tree_impl.h"
  39 #include "cc/trees/occlusion_tracker.h"
  40 #include "cc/trees/single_thread_proxy.h"
  41 #include "cc/trees/thread_proxy.h"
  42 #include "cc/trees/tree_synchronizer.h"
  43 #include "ui/gfx/size_conversions.h"
  44
  45 namespace {
  46 static base::StaticAtomicSequenceNumber s_layer_tree_host_sequence_number;
  47 }
  48
  49 namespace cc {
  50
  51 RendererCapabilities::RendererCapabilities(ResourceFormat best_texture_format,
  52                                            bool allow_partial_texture_updates,
  53                                            int max_texture_size,
  54                                            bool using_shared_memory_resources)
  55     : best_texture_format(best_texture_format),
  56       allow_partial_texture_updates(allow_partial_texture_updates),
  57       max_texture_size(max_texture_size),
  58       using_shared_memory_resources(using_shared_memory_resources) {}
  59
  60 RendererCapabilities::RendererCapabilities()
  61     : best_texture_format(RGBA_8888),
  62       allow_partial_texture_updates(false),
  63       max_texture_size(0),
  64       using_shared_memory_resources(false) {}
  65
  66 RendererCapabilities::~RendererCapabilities() {}
  67
  68 scoped_ptr<LayerTreeHost> LayerTreeHost::CreateThreaded(
  69     LayerTreeHostClient* client,
  70     SharedBitmapManager* manager,
  71     const LayerTreeSettings& settings,
  72     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
  73     scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
  74   DCHECK(main_task_runner);
  75   DCHECK(impl_task_runner);
  76   scoped_ptr<LayerTreeHost> layer_tree_host(
  77       new LayerTreeHost(client, manager, settings));
  78   layer_tree_host->InitializeThreaded(main_task_runner, impl_task_runner);
  79   return layer_tree_host.Pass();
  80 }
  81
  82 scoped_ptr<LayerTreeHost> LayerTreeHost::CreateSingleThreaded(
  83     LayerTreeHostClient* client,
  84     LayerTreeHostSingleThreadClient* single_thread_client,
  85     SharedBitmapManager* manager,
  86     const LayerTreeSettings& settings,
  87     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner) {
  88   scoped_ptr<LayerTreeHost> layer_tree_host(
  89       new LayerTreeHost(client, manager, settings));
  90   layer_tree_host->InitializeSingleThreaded(single_thread_client,
  91                                             main_task_runner);
  92   return layer_tree_host.Pass();
  93 }
  94
  95 LayerTreeHost::LayerTreeHost(LayerTreeHostClient* client,
  96                              SharedBitmapManager* manager,
  97                              const LayerTreeSettings& settings)
  98     : micro_benchmark_controller_(this),
  99       next_ui_resource_id_(1),
 100       animating_(false),
 101       needs_full_tree_sync_(true),
 102       client_(client),
 103       source_frame_number_(0),
 104       rendering_stats_instrumentation_(RenderingStatsInstrumentation::Create()),
 105       output_surface_lost_(true),
 106       num_failed_recreate_attempts_(0),
 107       settings_(settings),
 108       debug_state_(settings.initial_debug_state),
 109       overdraw_bottom_height_(0.f),
 110       device_scale_factor_(1.f),
 111       visible_(true),
 112       page_scale_factor_(1.f),
 113       min_page_scale_factor_(1.f),
 114       max_page_scale_factor_(1.f),
 115       has_gpu_rasterization_trigger_(false),
 116       content_is_suitable_for_gpu_rasterization_(true),
 117       gpu_rasterization_histogram_recorded_(false),
 118       background_color_(SK_ColorWHITE),
 119       has_transparent_background_(false),
 120       partial_texture_update_requests_(0),
 121       in_paint_layer_contents_(false),
 122       total_frames_used_for_lcd_text_metrics_(0),
 123       id_(s_layer_tree_host_sequence_number.GetNext() + 1),
 124       next_commit_forces_redraw_(false),
 125       shared_bitmap_manager_(manager) {
 126   if (settings_.accelerated_animation_enabled)
 127     animation_registrar_ = AnimationRegistrar::Create();
 128   rendering_stats_instrumentation_->set_record_rendering_stats(
 129       debug_state_.RecordRenderingStats());
 130 }
 131
 132 void LayerTreeHost::InitializeThreaded(
 133     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
 134     scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
 135   InitializeProxy(
 136       ThreadProxy::Create(this, main_task_runner, impl_task_runner));
 137 }
 138
 139 void LayerTreeHost::InitializeSingleThreaded(
 140     LayerTreeHostSingleThreadClient* single_thread_client,
 141     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner) {
 142   InitializeProxy(
 143       SingleThreadProxy::Create(this, single_thread_client, main_task_runner));
 144 }
 145
 146 void LayerTreeHost::InitializeForTesting(scoped_ptr<Proxy> proxy_for_testing) {
 147   InitializeProxy(proxy_for_testing.Pass());
 148 }
 149
 150 void LayerTreeHost::InitializeProxy(scoped_ptr<Proxy> proxy) {
 151   TRACE_EVENT0("cc", "LayerTreeHost::InitializeForReal");
 152
 153   proxy_ = proxy.Pass();
 154   proxy_->Start();
 155   if (settings_.accelerated_animation_enabled) {
 156     animation_registrar_->set_supports_scroll_animations(
 157         proxy_->SupportsImplScrolling());
 158   }
 159 }
 160
 161 LayerTreeHost::~LayerTreeHost() {
 162   TRACE_EVENT0("cc", "LayerTreeHost::~LayerTreeHost");
 163
 164   CHECK(swap_promise_monitor_.empty());
 165
 166   BreakSwapPromises(SwapPromise::COMMIT_FAILS);
 167
 168   overhang_ui_resource_.reset();
 169
 170   if (root_layer_.get())
 171     root_layer_->SetLayerTreeHost(NULL);
 172
 173   if (proxy_) {
 174     DCHECK(proxy_->IsMainThread());
 175     proxy_->Stop();
 176   }
 177
 178   // We must clear any pointers into the layer tree prior to destroying it.
 179   RegisterViewportLayers(NULL, NULL, NULL);
 180
 181   if (root_layer_.get()) {
 182     // The layer tree must be destroyed before the layer tree host. We've
 183     // made a contract with our animation controllers that the registrar
 184     // will outlive them, and we must make good.
 185     root_layer_ = NULL;
 186   }
 187 }
 188
 189 void LayerTreeHost::SetLayerTreeHostClientReady() {
 190   proxy_->SetLayerTreeHostClientReady();
 191 }
 192
 193 static void LayerTreeHostOnOutputSurfaceCreatedCallback(Layer* layer) {
 194   layer->OnOutputSurfaceCreated();
 195 }
 196
 197 void LayerTreeHost::OnCreateAndInitializeOutputSurfaceAttempted(bool success) {
 198   DCHECK(output_surface_lost_);
 199   TRACE_EVENT1("cc",
 200                "LayerTreeHost::OnCreateAndInitializeOutputSurfaceAttempted",
 201                "success",
 202                success);
 203
 204   if (!success) {
 205     // Tolerate a certain number of recreation failures to work around races
 206     // in the output-surface-lost machinery.
 207     ++num_failed_recreate_attempts_;
 208     if (num_failed_recreate_attempts_ >= 5)
 209       LOG(FATAL) << "Failed to create a fallback OutputSurface.";
 210     client_->DidFailToInitializeOutputSurface();
 211     return;
 212   }
 213
 214   output_surface_lost_ = false;
 215
 216   if (!contents_texture_manager_ && !settings_.impl_side_painting) {
 217     contents_texture_manager_ =
 218         PrioritizedResourceManager::Create(proxy_.get());
 219     surface_memory_placeholder_ =
 220         contents_texture_manager_->CreateTexture(gfx::Size(), RGBA_8888);
 221   }
 222
 223   if (root_layer()) {
 224     LayerTreeHostCommon::CallFunctionForSubtree(
 225         root_layer(), base::Bind(&LayerTreeHostOnOutputSurfaceCreatedCallback));
 226   }
 227
 228   client_->DidInitializeOutputSurface();
 229 }
 230
 231 void LayerTreeHost::DeleteContentsTexturesOnImplThread(
 232     ResourceProvider* resource_provider) {
 233   DCHECK(proxy_->IsImplThread());
 234   if (contents_texture_manager_)
 235     contents_texture_manager_->ClearAllMemory(resource_provider);
 236 }
 237
 238 void LayerTreeHost::DidBeginMainFrame() {
 239   client_->DidBeginMainFrame();
 240 }
 241
 242 void LayerTreeHost::UpdateClientAnimations(base::TimeTicks frame_begin_time) {
 243   animating_ = true;
 244   client_->Animate(frame_begin_time);
 245   animating_ = false;
 246 }
 247
 248 void LayerTreeHost::DidStopFlinging() {
 249   proxy_->MainThreadHasStoppedFlinging();
 250 }
 251
 252 void LayerTreeHost::Layout() {
 253   client_->Layout();
 254 }
 255
 256 void LayerTreeHost::BeginCommitOnImplThread(LayerTreeHostImpl* host_impl) {
 257   DCHECK(proxy_->IsImplThread());
 258   TRACE_EVENT0("cc", "LayerTreeHost::CommitTo");
 259 }
 260
 261 // This function commits the LayerTreeHost to an impl tree. When modifying
 262 // this function, keep in mind that the function *runs* on the impl thread! Any
 263 // code that is logically a main thread operation, e.g. deletion of a Layer,
 264 // should be delayed until the LayerTreeHost::CommitComplete, which will run
 265 // after the commit, but on the main thread.
 266 void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
 267   DCHECK(proxy_->IsImplThread());
 268
 269   // If there are linked evicted backings, these backings' resources may be put
 270   // into the impl tree, so we can't draw yet. Determine this before clearing
 271   // all evicted backings.
 272   bool new_impl_tree_has_no_evicted_resources = false;
 273   if (contents_texture_manager_) {
 274     new_impl_tree_has_no_evicted_resources =
 275         !contents_texture_manager_->LinkedEvictedBackingsExist();
 276
 277     // If the memory limit has been increased since this now-finishing
 278     // commit began, and the extra now-available memory would have been used,
 279     // then request another commit.
 280     if (contents_texture_manager_->MaxMemoryLimitBytes() <
 281             host_impl->memory_allocation_limit_bytes() &&
 282         contents_texture_manager_->MaxMemoryLimitBytes() <
 283             contents_texture_manager_->MaxMemoryNeededBytes()) {
 284       host_impl->SetNeedsCommit();
 285     }
 286
 287     host_impl->set_max_memory_needed_bytes(
 288         contents_texture_manager_->MaxMemoryNeededBytes());
 289
 290     contents_texture_manager_->UpdateBackingsState(
 291         host_impl->resource_provider());
 292     contents_texture_manager_->ReduceMemory(host_impl->resource_provider());
 293   }
 294
 295   LayerTreeImpl* sync_tree = host_impl->sync_tree();
 296
 297   if (next_commit_forces_redraw_) {
 298     sync_tree->ForceRedrawNextActivation();
 299     next_commit_forces_redraw_ = false;
 300   }
 301
 302   sync_tree->set_source_frame_number(source_frame_number());
 303
 304   if (needs_full_tree_sync_) {
 305     sync_tree->SetRootLayer(TreeSynchronizer::SynchronizeTrees(
 306         root_layer(), sync_tree->DetachLayerTree(), sync_tree));
 307   }
 308
 309   {
 310     TRACE_EVENT0("cc", "LayerTreeHost::PushProperties");
 311     TreeSynchronizer::PushProperties(root_layer(), sync_tree->root_layer());
 312   }
 313
 314   sync_tree->set_needs_full_tree_sync(needs_full_tree_sync_);
 315   needs_full_tree_sync_ = false;
 316
 317   if (hud_layer_.get()) {
 318     LayerImpl* hud_impl = LayerTreeHostCommon::FindLayerInSubtree(
 319         sync_tree->root_layer(), hud_layer_->id());
 320     sync_tree->set_hud_layer(static_cast<HeadsUpDisplayLayerImpl*>(hud_impl));
 321   } else {
 322     sync_tree->set_hud_layer(NULL);
 323   }
 324
 325   sync_tree->set_background_color(background_color_);
 326   sync_tree->set_has_transparent_background(has_transparent_background_);
 327
 328   if (page_scale_layer_ && inner_viewport_scroll_layer_) {
 329     sync_tree->SetViewportLayersFromIds(
 330         page_scale_layer_->id(),
 331         inner_viewport_scroll_layer_->id(),
 332         outer_viewport_scroll_layer_ ? outer_viewport_scroll_layer_->id()
 333                                      : Layer::INVALID_ID);
 334   } else {
 335     sync_tree->ClearViewportLayers();
 336   }
 337
 338   sync_tree->RegisterSelection(selection_start_, selection_end_);
 339
 340   float page_scale_delta =
 341       sync_tree->page_scale_delta() / sync_tree->sent_page_scale_delta();
 342   sync_tree->SetPageScaleValues(page_scale_factor_,
 343                                 min_page_scale_factor_,
 344                                 max_page_scale_factor_,
 345                                 page_scale_delta);
 346   sync_tree->set_sent_page_scale_delta(1.f);
 347
 348   sync_tree->PassSwapPromises(&swap_promise_list_);
 349
 350   host_impl->SetUseGpuRasterization(UseGpuRasterization());
 351   RecordGpuRasterizationHistogram();
 352
 353   host_impl->SetViewportSize(device_viewport_size_);
 354   host_impl->SetOverdrawBottomHeight(overdraw_bottom_height_);
 355   host_impl->SetDeviceScaleFactor(device_scale_factor_);
 356   host_impl->SetDebugState(debug_state_);
 357   if (pending_page_scale_animation_) {
 358     host_impl->StartPageScaleAnimation(
 359         pending_page_scale_animation_->target_offset,
 360         pending_page_scale_animation_->use_anchor,
 361         pending_page_scale_animation_->scale,
 362         pending_page_scale_animation_->duration);
 363     pending_page_scale_animation_.reset();
 364   }
 365
 366   if (!ui_resource_request_queue_.empty()) {
 367     sync_tree->set_ui_resource_request_queue(ui_resource_request_queue_);
 368     ui_resource_request_queue_.clear();
 369   }
 370   if (overhang_ui_resource_) {
 371     host_impl->SetOverhangUIResource(
 372         overhang_ui_resource_->id(),
 373         GetUIResourceSize(overhang_ui_resource_->id()));
 374   }
 375
 376   DCHECK(!sync_tree->ViewportSizeInvalid());
 377
 378   if (new_impl_tree_has_no_evicted_resources) {
 379     if (sync_tree->ContentsTexturesPurged())
 380       sync_tree->ResetContentsTexturesPurged();
 381   }
 382
 383   sync_tree->set_has_ever_been_drawn(false);
 384
 385   micro_benchmark_controller_.ScheduleImplBenchmarks(host_impl);
 386 }
 387
 388 void LayerTreeHost::WillCommit() {
 389   client_->WillCommit();
 390 }
 391
 392 void LayerTreeHost::UpdateHudLayer() {
 393   if (debug_state_.ShowHudInfo()) {
 394     if (!hud_layer_.get())
 395       hud_layer_ = HeadsUpDisplayLayer::Create();
 396
 397     if (root_layer_.get() && !hud_layer_->parent())
 398       root_layer_->AddChild(hud_layer_);
 399   } else if (hud_layer_.get()) {
 400     hud_layer_->RemoveFromParent();
 401     hud_layer_ = NULL;
 402   }
 403 }
 404
 405 void LayerTreeHost::CommitComplete() {
 406   source_frame_number_++;
 407   client_->DidCommit();
 408 }
 409
 410 scoped_ptr<OutputSurface> LayerTreeHost::CreateOutputSurface() {
 411   return client_->CreateOutputSurface(num_failed_recreate_attempts_ >= 4);
 412 }
 413
 414 scoped_ptr<LayerTreeHostImpl> LayerTreeHost::CreateLayerTreeHostImpl(
 415     LayerTreeHostImplClient* client) {
 416   DCHECK(proxy_->IsImplThread());
 417   scoped_ptr<LayerTreeHostImpl> host_impl =
 418       LayerTreeHostImpl::Create(settings_,
 419                                 client,
 420                                 proxy_.get(),
 421                                 rendering_stats_instrumentation_.get(),
 422                                 shared_bitmap_manager_,
 423                                 id_);
 424   host_impl->SetUseGpuRasterization(UseGpuRasterization());
 425   shared_bitmap_manager_ = NULL;
 426   if (settings_.calculate_top_controls_position &&
 427       host_impl->top_controls_manager()) {
 428     top_controls_manager_weak_ptr_ =
 429         host_impl->top_controls_manager()->AsWeakPtr();
 430   }
 431   input_handler_weak_ptr_ = host_impl->AsWeakPtr();
 432   return host_impl.Pass();
 433 }
 434
 435 void LayerTreeHost::DidLoseOutputSurface() {
 436   TRACE_EVENT0("cc", "LayerTreeHost::DidLoseOutputSurface");
 437   DCHECK(proxy_->IsMainThread());
 438
 439   if (output_surface_lost_)
 440     return;
 441
 442   num_failed_recreate_attempts_ = 0;
 443   output_surface_lost_ = true;
 444   SetNeedsCommit();
 445 }
 446
 447 void LayerTreeHost::FinishAllRendering() {
 448   proxy_->FinishAllRendering();
 449 }
 450
 451 void LayerTreeHost::SetDeferCommits(bool defer_commits) {
 452   proxy_->SetDeferCommits(defer_commits);
 453 }
 454
 455 void LayerTreeHost::DidDeferCommit() {}
 456
 457 void LayerTreeHost::SetNeedsDisplayOnAllLayers() {
 458   std::stack<Layer*> layer_stack;
 459   layer_stack.push(root_layer());
 460   while (!layer_stack.empty()) {
 461     Layer* current_layer = layer_stack.top();
 462     layer_stack.pop();
 463     current_layer->SetNeedsDisplay();
 464     for (unsigned int i = 0; i < current_layer->children().size(); i++) {
 465       layer_stack.push(current_layer->child_at(i));
 466     }
 467   }
 468 }
 469
 470 const RendererCapabilities& LayerTreeHost::GetRendererCapabilities() const {
 471   return proxy_->GetRendererCapabilities();
 472 }
 473
 474 void LayerTreeHost::SetNeedsAnimate() {
 475   proxy_->SetNeedsAnimate();
 476   NotifySwapPromiseMonitorsOfSetNeedsCommit();
 477 }
 478
 479 void LayerTreeHost::SetNeedsUpdateLayers() {
 480   proxy_->SetNeedsUpdateLayers();
 481   NotifySwapPromiseMonitorsOfSetNeedsCommit();
 482 }
 483
 484 void LayerTreeHost::SetNeedsCommit() {
 485   if (!prepaint_callback_.IsCancelled()) {
 486     TRACE_EVENT_INSTANT0("cc",
 487                          "LayerTreeHost::SetNeedsCommit::cancel prepaint",
 488                          TRACE_EVENT_SCOPE_THREAD);
 489     prepaint_callback_.Cancel();
 490   }
 491   proxy_->SetNeedsCommit();
 492   NotifySwapPromiseMonitorsOfSetNeedsCommit();
 493 }
 494
 495 void LayerTreeHost::SetNeedsFullTreeSync() {
 496   needs_full_tree_sync_ = true;
 497   SetNeedsCommit();
 498 }
 499
 500 void LayerTreeHost::SetNeedsRedraw() {
 501   SetNeedsRedrawRect(gfx::Rect(device_viewport_size_));
 502 }
 503
 504 void LayerTreeHost::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
 505   proxy_->SetNeedsRedraw(damage_rect);
 506 }
 507
 508 bool LayerTreeHost::CommitRequested() const {
 509   return proxy_->CommitRequested();
 510 }
 511
 512 bool LayerTreeHost::BeginMainFrameRequested() const {
 513   return proxy_->BeginMainFrameRequested();
 514 }
 515
 516
 517 void LayerTreeHost::SetNextCommitWaitsForActivation() {
 518   proxy_->SetNextCommitWaitsForActivation();
 519 }
 520
 521 void LayerTreeHost::SetNextCommitForcesRedraw() {
 522   next_commit_forces_redraw_ = true;
 523 }
 524
 525 void LayerTreeHost::SetAnimationEvents(
 526     scoped_ptr<AnimationEventsVector> events) {
 527   DCHECK(proxy_->IsMainThread());
 528   for (size_t event_index = 0; event_index < events->size(); ++event_index) {
 529     int event_layer_id = (*events)[event_index].layer_id;
 530
 531     // Use the map of all controllers, not just active ones, since non-active
 532     // controllers may still receive events for impl-only animations.
 533     const AnimationRegistrar::AnimationControllerMap& animation_controllers =
 534         animation_registrar_->all_animation_controllers();
 535     AnimationRegistrar::AnimationControllerMap::const_iterator iter =
 536         animation_controllers.find(event_layer_id);
 537     if (iter != animation_controllers.end()) {
 538       switch ((*events)[event_index].type) {
 539         case AnimationEvent::Started:
 540           (*iter).second->NotifyAnimationStarted((*events)[event_index]);
 541           break;
 542
 543         case AnimationEvent::Finished:
 544           (*iter).second->NotifyAnimationFinished((*events)[event_index]);
 545           break;
 546
 547         case AnimationEvent::Aborted:
 548           (*iter).second->NotifyAnimationAborted((*events)[event_index]);
 549           break;
 550
 551         case AnimationEvent::PropertyUpdate:
 552           (*iter).second->NotifyAnimationPropertyUpdate((*events)[event_index]);
 553           break;
 554       }
 555     }
 556   }
 557 }
 558
 559 void LayerTreeHost::SetRootLayer(scoped_refptr<Layer> root_layer) {
 560   if (root_layer_.get() == root_layer.get())
 561     return;
 562
 563   if (root_layer_.get())
 564     root_layer_->SetLayerTreeHost(NULL);
 565   root_layer_ = root_layer;
 566   if (root_layer_.get()) {
 567     DCHECK(!root_layer_->parent());
 568     root_layer_->SetLayerTreeHost(this);
 569   }
 570
 571   if (hud_layer_.get())
 572     hud_layer_->RemoveFromParent();
 573
 574   // Reset gpu rasterization flag.
 575   // This flag is sticky until a new tree comes along.
 576   content_is_suitable_for_gpu_rasterization_ = true;
 577   gpu_rasterization_histogram_recorded_ = false;
 578
 579   SetNeedsFullTreeSync();
 580 }
 581
 582 void LayerTreeHost::SetDebugState(const LayerTreeDebugState& debug_state) {
 583   LayerTreeDebugState new_debug_state =
 584       LayerTreeDebugState::Unite(settings_.initial_debug_state, debug_state);
 585
 586   if (LayerTreeDebugState::Equal(debug_state_, new_debug_state))
 587     return;
 588
 589   debug_state_ = new_debug_state;
 590
 591   rendering_stats_instrumentation_->set_record_rendering_stats(
 592       debug_state_.RecordRenderingStats());
 593
 594   SetNeedsCommit();
 595   proxy_->SetDebugState(debug_state);
 596 }
 597
 598 bool LayerTreeHost::UseGpuRasterization() const {
 599   if (settings_.gpu_rasterization_forced) {
 600     return true;
 601   } else if (settings_.gpu_rasterization_enabled) {
 602     return has_gpu_rasterization_trigger_ &&
 603            content_is_suitable_for_gpu_rasterization_;
 604   } else {
 605     return false;
 606   }
 607 }
 608
 609 void LayerTreeHost::SetHasGpuRasterizationTrigger(bool has_trigger) {
 610   if (has_trigger == has_gpu_rasterization_trigger_)
 611     return;
 612
 613   has_gpu_rasterization_trigger_ = has_trigger;
 614   TRACE_EVENT_INSTANT1("cc",
 615                        "LayerTreeHost::SetHasGpuRasterizationTrigger",
 616                        TRACE_EVENT_SCOPE_THREAD,
 617                        "has_trigger",
 618                        has_gpu_rasterization_trigger_);
 619 }
 620
 621 void LayerTreeHost::SetViewportSize(const gfx::Size& device_viewport_size) {
 622   if (device_viewport_size == device_viewport_size_)
 623     return;
 624
 625   device_viewport_size_ = device_viewport_size;
 626
 627   SetNeedsCommit();
 628 }
 629
 630 void LayerTreeHost::SetOverdrawBottomHeight(float overdraw_bottom_height) {
 631   if (overdraw_bottom_height_ == overdraw_bottom_height)
 632     return;
 633
 634   overdraw_bottom_height_ = overdraw_bottom_height;
 635   SetNeedsCommit();
 636 }
 637
 638 void LayerTreeHost::ApplyPageScaleDeltaFromImplSide(float page_scale_delta) {
 639   DCHECK(CommitRequested());
 640   page_scale_factor_ *= page_scale_delta;
 641 }
 642
 643 void LayerTreeHost::SetPageScaleFactorAndLimits(float page_scale_factor,
 644                                                 float min_page_scale_factor,
 645                                                 float max_page_scale_factor) {
 646   if (page_scale_factor == page_scale_factor_ &&
 647       min_page_scale_factor == min_page_scale_factor_ &&
 648       max_page_scale_factor == max_page_scale_factor_)
 649     return;
 650
 651   page_scale_factor_ = page_scale_factor;
 652   min_page_scale_factor_ = min_page_scale_factor;
 653   max_page_scale_factor_ = max_page_scale_factor;
 654   SetNeedsCommit();
 655 }
 656
 657 void LayerTreeHost::SetOverhangBitmap(const SkBitmap& bitmap) {
 658   DCHECK(bitmap.width() && bitmap.height());
 659   DCHECK_EQ(bitmap.bytesPerPixel(), 4);
 660
 661   SkBitmap bitmap_copy;
 662   if (bitmap.isImmutable()) {
 663     bitmap_copy = bitmap;
 664   } else {
 665     bitmap.copyTo(&bitmap_copy);
 666     bitmap_copy.setImmutable();
 667   }
 668
 669   UIResourceBitmap overhang_bitmap(bitmap_copy);
 670   overhang_bitmap.SetWrapMode(UIResourceBitmap::REPEAT);
 671   overhang_ui_resource_ = ScopedUIResource::Create(this, overhang_bitmap);
 672 }
 673
 674 void LayerTreeHost::SetVisible(bool visible) {
 675   if (visible_ == visible)
 676     return;
 677   visible_ = visible;
 678   if (!visible)
 679     ReduceMemoryUsage();
 680   proxy_->SetVisible(visible);
 681 }
 682
 683 void LayerTreeHost::StartPageScaleAnimation(const gfx::Vector2d& target_offset,
 684                                             bool use_anchor,
 685                                             float scale,
 686                                             base::TimeDelta duration) {
 687   pending_page_scale_animation_.reset(new PendingPageScaleAnimation);
 688   pending_page_scale_animation_->target_offset = target_offset;
 689   pending_page_scale_animation_->use_anchor = use_anchor;
 690   pending_page_scale_animation_->scale = scale;
 691   pending_page_scale_animation_->duration = duration;
 692
 693   SetNeedsCommit();
 694 }
 695
 696 void LayerTreeHost::NotifyInputThrottledUntilCommit() {
 697   proxy_->NotifyInputThrottledUntilCommit();
 698 }
 699
 700 void LayerTreeHost::Composite(base::TimeTicks frame_begin_time) {
 701   DCHECK(!proxy_->HasImplThread());
 702   SingleThreadProxy* proxy = static_cast<SingleThreadProxy*>(proxy_.get());
 703
 704   if (output_surface_lost_)
 705     proxy->CreateAndInitializeOutputSurface();
 706   if (output_surface_lost_)
 707     return;
 708
 709   proxy->CompositeImmediately(frame_begin_time);
 710 }
 711
 712 bool LayerTreeHost::UpdateLayers(ResourceUpdateQueue* queue) {
 713   DCHECK(!output_surface_lost_);
 714
 715   if (!root_layer())
 716     return false;
 717
 718   DCHECK(!root_layer()->parent());
 719
 720   bool result = UpdateLayers(root_layer(), queue);
 721
 722   micro_benchmark_controller_.DidUpdateLayers();
 723
 724   return result || next_commit_forces_redraw_;
 725 }
 726
 727 static Layer* FindFirstScrollableLayer(Layer* layer) {
 728   if (!layer)
 729     return NULL;
 730
 731   if (layer->scrollable())
 732     return layer;
 733
 734   for (size_t i = 0; i < layer->children().size(); ++i) {
 735     Layer* found = FindFirstScrollableLayer(layer->children()[i].get());
 736     if (found)
 737       return found;
 738   }
 739
 740   return NULL;
 741 }
 742
 743 void LayerTreeHost::RecordGpuRasterizationHistogram() {
 744   // Gpu rasterization is only supported when impl-side painting is enabled.
 745   if (gpu_rasterization_histogram_recorded_ || !settings_.impl_side_painting)
 746     return;
 747
 748   // Record how widely gpu rasterization is enabled.
 749   // This number takes device/gpu whitelisting/backlisting into account.
 750   // Note that we do not consider the forced gpu rasterization mode, which is
 751   // mostly used for debugging purposes.
 752   UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationEnabled",
 753                         settings_.gpu_rasterization_enabled);
 754   if (settings_.gpu_rasterization_enabled) {
 755     UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationTriggered",
 756                           has_gpu_rasterization_trigger_);
 757     UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationSuitableContent",
 758                           content_is_suitable_for_gpu_rasterization_);
 759     // Record how many pages actually get gpu rasterization when enabled.
 760     UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationUsed",
 761                           (has_gpu_rasterization_trigger_ &&
 762                            content_is_suitable_for_gpu_rasterization_));
 763   }
 764
 765   gpu_rasterization_histogram_recorded_ = true;
 766 }
 767
 768 void LayerTreeHost::CalculateLCDTextMetricsCallback(Layer* layer) {
 769   if (!layer->SupportsLCDText())
 770     return;
 771
 772   lcd_text_metrics_.total_num_cc_layers++;
 773   if (layer->draw_properties().can_use_lcd_text) {
 774     lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text++;
 775     if (layer->contents_opaque())
 776       lcd_text_metrics_.total_num_cc_layers_will_use_lcd_text++;
 777   }
 778 }
 779
 780 bool LayerTreeHost::UsingSharedMemoryResources() {
 781   return GetRendererCapabilities().using_shared_memory_resources;
 782 }
 783
 784 bool LayerTreeHost::UpdateLayers(Layer* root_layer,
 785                                  ResourceUpdateQueue* queue) {
 786   TRACE_EVENT1("cc", "LayerTreeHost::UpdateLayers",
 787                "source_frame_number", source_frame_number());
 788
 789   RenderSurfaceLayerList update_list;
 790   {
 791     UpdateHudLayer();
 792
 793     Layer* root_scroll = FindFirstScrollableLayer(root_layer);
 794     Layer* page_scale_layer = page_scale_layer_;
 795     if (!page_scale_layer && root_scroll)
 796       page_scale_layer = root_scroll->parent();
 797
 798     if (hud_layer_) {
 799       hud_layer_->PrepareForCalculateDrawProperties(
 800           device_viewport_size(), device_scale_factor_);
 801     }
 802
 803     TRACE_EVENT0("cc", "LayerTreeHost::UpdateLayers::CalcDrawProps");
 804     bool can_render_to_separate_surface = true;
 805     // TODO(vmpstr): Passing 0 as the current render surface layer list id means
 806     // that we won't be able to detect if a layer is part of |update_list|.
 807     // Change this if this information is required.
 808     int render_surface_layer_list_id = 0;
 809     LayerTreeHostCommon::CalcDrawPropsMainInputs inputs(
 810         root_layer,
 811         device_viewport_size(),
 812         gfx::Transform(),
 813         device_scale_factor_,
 814         page_scale_factor_,
 815         page_scale_layer,
 816         GetRendererCapabilities().max_texture_size,
 817         settings_.can_use_lcd_text,
 818         can_render_to_separate_surface,
 819         settings_.layer_transforms_should_scale_layer_contents,
 820         &update_list,
 821         render_surface_layer_list_id);
 822     LayerTreeHostCommon::CalculateDrawProperties(&inputs);
 823
 824     if (total_frames_used_for_lcd_text_metrics_ <=
 825         kTotalFramesToUseForLCDTextMetrics) {
 826       LayerTreeHostCommon::CallFunctionForSubtree(
 827           root_layer,
 828           base::Bind(&LayerTreeHost::CalculateLCDTextMetricsCallback,
 829                      base::Unretained(this)));
 830       total_frames_used_for_lcd_text_metrics_++;
 831     }
 832
 833     if (total_frames_used_for_lcd_text_metrics_ ==
 834         kTotalFramesToUseForLCDTextMetrics) {
 835       total_frames_used_for_lcd_text_metrics_++;
 836
 837       UMA_HISTOGRAM_PERCENTAGE(
 838           "Renderer4.LCDText.PercentageOfCandidateLayers",
 839           lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text * 100.0 /
 840           lcd_text_metrics_.total_num_cc_layers);
 841       UMA_HISTOGRAM_PERCENTAGE(
 842           "Renderer4.LCDText.PercentageOfAALayers",
 843           lcd_text_metrics_.total_num_cc_layers_will_use_lcd_text * 100.0 /
 844           lcd_text_metrics_.total_num_cc_layers_can_use_lcd_text);
 845     }
 846   }
 847
 848   // Reset partial texture update requests.
 849   partial_texture_update_requests_ = 0;
 850
 851   bool did_paint_content = false;
 852   bool need_more_updates = false;
 853   PaintLayerContents(
 854       update_list, queue, &did_paint_content, &need_more_updates);
 855   if (need_more_updates) {
 856     TRACE_EVENT0("cc", "LayerTreeHost::UpdateLayers::posting prepaint task");
 857     prepaint_callback_.Reset(base::Bind(&LayerTreeHost::TriggerPrepaint,
 858                                         base::Unretained(this)));
 859     static base::TimeDelta prepaint_delay =
 860         base::TimeDelta::FromMilliseconds(100);
 861     base::MessageLoop::current()->PostDelayedTask(
 862         FROM_HERE, prepaint_callback_.callback(), prepaint_delay);
 863   }
 864
 865   return did_paint_content;
 866 }
 867
 868 void LayerTreeHost::TriggerPrepaint() {
 869   prepaint_callback_.Cancel();
 870   TRACE_EVENT0("cc", "LayerTreeHost::TriggerPrepaint");
 871   SetNeedsCommit();
 872 }
 873
 874 static void LayerTreeHostReduceMemoryCallback(Layer* layer) {
 875   layer->ReduceMemoryUsage();
 876 }
 877
 878 void LayerTreeHost::ReduceMemoryUsage() {
 879   if (!root_layer())
 880     return;
 881
 882   LayerTreeHostCommon::CallFunctionForSubtree(
 883       root_layer(),
 884       base::Bind(&LayerTreeHostReduceMemoryCallback));
 885 }
 886
 887 void LayerTreeHost::SetPrioritiesForSurfaces(size_t surface_memory_bytes) {
 888   DCHECK(surface_memory_placeholder_);
 889
 890   // Surfaces have a place holder for their memory since they are managed
 891   // independantly but should still be tracked and reduce other memory usage.
 892   surface_memory_placeholder_->SetTextureManager(
 893       contents_texture_manager_.get());
 894   surface_memory_placeholder_->set_request_priority(
 895       PriorityCalculator::RenderSurfacePriority());
 896   surface_memory_placeholder_->SetToSelfManagedMemoryPlaceholder(
 897       surface_memory_bytes);
 898 }
 899
 900 void LayerTreeHost::SetPrioritiesForLayers(
 901     const RenderSurfaceLayerList& update_list) {
 902   PriorityCalculator calculator;
 903   typedef LayerIterator<Layer> LayerIteratorType;
 904   LayerIteratorType end = LayerIteratorType::End(&update_list);
 905   for (LayerIteratorType it = LayerIteratorType::Begin(&update_list);
 906        it != end;
 907        ++it) {
 908     if (it.represents_itself()) {
 909       it->SetTexturePriorities(calculator);
 910     } else if (it.represents_target_render_surface()) {
 911       if (it->mask_layer())
 912         it->mask_layer()->SetTexturePriorities(calculator);
 913       if (it->replica_layer() && it->replica_layer()->mask_layer())
 914         it->replica_layer()->mask_layer()->SetTexturePriorities(calculator);
 915     }
 916   }
 917 }
 918
 919 void LayerTreeHost::PrioritizeTextures(
 920     const RenderSurfaceLayerList& render_surface_layer_list) {
 921   if (!contents_texture_manager_)
 922     return;
 923
 924   contents_texture_manager_->ClearPriorities();
 925
 926   size_t memory_for_render_surfaces_metric =
 927       CalculateMemoryForRenderSurfaces(render_surface_layer_list);
 928
 929   SetPrioritiesForLayers(render_surface_layer_list);
 930   SetPrioritiesForSurfaces(memory_for_render_surfaces_metric);
 931
 932   contents_texture_manager_->PrioritizeTextures();
 933 }
 934
 935 size_t LayerTreeHost::CalculateMemoryForRenderSurfaces(
 936     const RenderSurfaceLayerList& update_list) {
 937   size_t readback_bytes = 0;
 938   size_t max_background_texture_bytes = 0;
 939   size_t contents_texture_bytes = 0;
 940
 941   // Start iteration at 1 to skip the root surface as it does not have a texture
 942   // cost.
 943   for (size_t i = 1; i < update_list.size(); ++i) {
 944     Layer* render_surface_layer = update_list.at(i);
 945     RenderSurface* render_surface = render_surface_layer->render_surface();
 946
 947     size_t bytes =
 948         Resource::MemorySizeBytes(render_surface->content_rect().size(),
 949                                   RGBA_8888);
 950     contents_texture_bytes += bytes;
 951
 952     if (render_surface_layer->background_filters().IsEmpty())
 953       continue;
 954
 955     if (bytes > max_background_texture_bytes)
 956       max_background_texture_bytes = bytes;
 957     if (!readback_bytes) {
 958       readback_bytes = Resource::MemorySizeBytes(device_viewport_size_,
 959                                                  RGBA_8888);
 960     }
 961   }
 962   return readback_bytes + max_background_texture_bytes + contents_texture_bytes;
 963 }
 964
 965 void LayerTreeHost::PaintMasksForRenderSurface(Layer* render_surface_layer,
 966                                                ResourceUpdateQueue* queue,
 967                                                bool* did_paint_content,
 968                                                bool* need_more_updates) {
 969   // Note: Masks and replicas only exist for layers that own render surfaces. If
 970   // we reach this point in code, we already know that at least something will
 971   // be drawn into this render surface, so the mask and replica should be
 972   // painted.
 973
 974   Layer* mask_layer = render_surface_layer->mask_layer();
 975   if (mask_layer) {
 976     *did_paint_content |= mask_layer->Update(queue, NULL);
 977     *need_more_updates |= mask_layer->NeedMoreUpdates();
 978   }
 979
 980   Layer* replica_mask_layer =
 981       render_surface_layer->replica_layer() ?
 982       render_surface_layer->replica_layer()->mask_layer() : NULL;
 983   if (replica_mask_layer) {
 984     *did_paint_content |= replica_mask_layer->Update(queue, NULL);
 985     *need_more_updates |= replica_mask_layer->NeedMoreUpdates();
 986   }
 987 }
 988
 989 void LayerTreeHost::PaintLayerContents(
 990     const RenderSurfaceLayerList& render_surface_layer_list,
 991     ResourceUpdateQueue* queue,
 992     bool* did_paint_content,
 993     bool* need_more_updates) {
 994   OcclusionTracker<Layer> occlusion_tracker(
 995       root_layer_->render_surface()->content_rect());
 996   occlusion_tracker.set_minimum_tracking_size(
 997       settings_.minimum_occlusion_tracking_size);
 998
 999   PrioritizeTextures(render_surface_layer_list);
1000
1001   in_paint_layer_contents_ = true;
1002
1003   // Iterates front-to-back to allow for testing occlusion and performing
1004   // culling during the tree walk.
1005   typedef LayerIterator<Layer> LayerIteratorType;
1006   LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
1007   for (LayerIteratorType it =
1008            LayerIteratorType::Begin(&render_surface_layer_list);
1009        it != end;
1010        ++it) {
1011     occlusion_tracker.EnterLayer(it);
1012
1013     if (it.represents_target_render_surface()) {
1014       PaintMasksForRenderSurface(
1015           *it, queue, did_paint_content, need_more_updates);
1016     } else if (it.represents_itself()) {
1017       DCHECK(!it->paint_properties().bounds.IsEmpty());
1018       *did_paint_content |= it->Update(queue, &occlusion_tracker);
1019       *need_more_updates |= it->NeedMoreUpdates();
1020       // Note the '&&' with previous is-suitable state.
1021       // This means that once the layer-tree becomes unsuitable for gpu
1022       // rasterization due to some content, it will continue to be unsuitable
1023       // even if that content is replaced by gpu-friendly content.
1024       // This is to avoid switching back-and-forth between gpu and sw
1025       // rasterization which may be both bad for performance and visually
1026       // jarring.
1027       content_is_suitable_for_gpu_rasterization_ &=
1028           it->IsSuitableForGpuRasterization();
1029     }
1030
1031     occlusion_tracker.LeaveLayer(it);
1032   }
1033
1034   in_paint_layer_contents_ = false;
1035 }
1036
1037 void LayerTreeHost::ApplyScrollAndScale(ScrollAndScaleSet* info) {
1038   if (!root_layer_.get())
1039     return;
1040
1041   ScopedPtrVector<SwapPromise>::iterator it = info->swap_promises.begin();
1042   for (; it != info->swap_promises.end(); ++it) {
1043     scoped_ptr<SwapPromise> swap_promise(info->swap_promises.take(it));
1044     TRACE_EVENT_FLOW_STEP0("input",
1045                            "LatencyInfo.Flow",
1046                            TRACE_ID_DONT_MANGLE(swap_promise->TraceId()),
1047                            "Main thread scroll update");
1048     QueueSwapPromise(swap_promise.Pass());
1049   }
1050
1051   gfx::Vector2d inner_viewport_scroll_delta;
1052   gfx::Vector2d outer_viewport_scroll_delta;
1053
1054   for (size_t i = 0; i < info->scrolls.size(); ++i) {
1055     Layer* layer = LayerTreeHostCommon::FindLayerInSubtree(
1056         root_layer_.get(), info->scrolls[i].layer_id);
1057     if (!layer)
1058       continue;
1059     if (layer == outer_viewport_scroll_layer_.get()) {
1060       outer_viewport_scroll_delta += info->scrolls[i].scroll_delta;
1061     } else if (layer == inner_viewport_scroll_layer_.get()) {
1062       inner_viewport_scroll_delta += info->scrolls[i].scroll_delta;
1063     } else {
1064       layer->SetScrollOffsetFromImplSide(layer->scroll_offset() +
1065                                          info->scrolls[i].scroll_delta);
1066     }
1067   }
1068
1069   if (!inner_viewport_scroll_delta.IsZero() ||
1070       !outer_viewport_scroll_delta.IsZero() || info->page_scale_delta != 1.f) {
1071     // SetScrollOffsetFromImplSide above could have destroyed the tree,
1072     // so re-get this layer before doing anything to it.
1073
1074     // Preemptively apply the scroll offset and scale delta here before sending
1075     // it to the client.  If the client comes back and sets it to the same
1076     // value, then the layer can early out without needing a full commit.
1077     DCHECK(inner_viewport_scroll_layer_);  // We should always have this.
1078
1079     inner_viewport_scroll_layer_->SetScrollOffsetFromImplSide(
1080         inner_viewport_scroll_layer_->scroll_offset() +
1081         inner_viewport_scroll_delta);
1082     if (outer_viewport_scroll_layer_) {
1083       outer_viewport_scroll_layer_->SetScrollOffsetFromImplSide(
1084           outer_viewport_scroll_layer_->scroll_offset() +
1085           outer_viewport_scroll_delta);
1086     }
1087     ApplyPageScaleDeltaFromImplSide(info->page_scale_delta);
1088
1089     client_->ApplyScrollAndScale(
1090         inner_viewport_scroll_delta + outer_viewport_scroll_delta,
1091         info->page_scale_delta);
1092   }
1093 }
1094
1095 void LayerTreeHost::StartRateLimiter() {
1096   if (animating_)
1097     return;
1098
1099   if (!rate_limit_timer_.IsRunning()) {
1100     rate_limit_timer_.Start(FROM_HERE,
1101                             base::TimeDelta(),
1102                             this,
1103                             &LayerTreeHost::RateLimit);
1104   }
1105 }
1106
1107 void LayerTreeHost::StopRateLimiter() {
1108   rate_limit_timer_.Stop();
1109 }
1110
1111 void LayerTreeHost::RateLimit() {
1112   // Force a no-op command on the compositor context, so that any ratelimiting
1113   // commands will wait for the compositing context, and therefore for the
1114   // SwapBuffers.
1115   proxy_->ForceSerializeOnSwapBuffers();
1116   client_->RateLimitSharedMainThreadContext();
1117 }
1118
1119 bool LayerTreeHost::AlwaysUsePartialTextureUpdates() {
1120   if (!proxy_->GetRendererCapabilities().allow_partial_texture_updates)
1121     return false;
1122   return !proxy_->HasImplThread();
1123 }
1124
1125 size_t LayerTreeHost::MaxPartialTextureUpdates() const {
1126   size_t max_partial_texture_updates = 0;
1127   if (proxy_->GetRendererCapabilities().allow_partial_texture_updates &&
1128       !settings_.impl_side_painting) {
1129     max_partial_texture_updates =
1130         std::min(settings_.max_partial_texture_updates,
1131                  proxy_->MaxPartialTextureUpdates());
1132   }
1133   return max_partial_texture_updates;
1134 }
1135
1136 bool LayerTreeHost::RequestPartialTextureUpdate() {
1137   if (partial_texture_update_requests_ >= MaxPartialTextureUpdates())
1138     return false;
1139
1140   partial_texture_update_requests_++;
1141   return true;
1142 }
1143
1144 void LayerTreeHost::SetDeviceScaleFactor(float device_scale_factor) {
1145   if (device_scale_factor == device_scale_factor_)
1146     return;
1147   device_scale_factor_ = device_scale_factor;
1148
1149   SetNeedsCommit();
1150 }
1151
1152 void LayerTreeHost::UpdateTopControlsState(TopControlsState constraints,
1153                                            TopControlsState current,
1154                                            bool animate) {
1155   if (!settings_.calculate_top_controls_position)
1156     return;
1157
1158   // Top controls are only used in threaded mode.
1159   proxy_->ImplThreadTaskRunner()->PostTask(
1160       FROM_HERE,
1161       base::Bind(&TopControlsManager::UpdateTopControlsState,
1162                  top_controls_manager_weak_ptr_,
1163                  constraints,
1164                  current,
1165                  animate));
1166 }
1167
1168 void LayerTreeHost::AsValueInto(base::debug::TracedValue* state) const {
1169   state->BeginDictionary("proxy");
1170   proxy_->AsValueInto(state);
1171   state->EndDictionary();
1172 }
1173
1174 void LayerTreeHost::AnimateLayers(base::TimeTicks monotonic_time) {
1175   if (!settings_.accelerated_animation_enabled ||
1176       animation_registrar_->active_animation_controllers().empty())
1177     return;
1178
1179   TRACE_EVENT0("cc", "LayerTreeHost::AnimateLayers");
1180
1181   AnimationRegistrar::AnimationControllerMap copy =
1182       animation_registrar_->active_animation_controllers();
1183   for (AnimationRegistrar::AnimationControllerMap::iterator iter = copy.begin();
1184        iter != copy.end();
1185        ++iter) {
1186     (*iter).second->Animate(monotonic_time);
1187     bool start_ready_animations = true;
1188     (*iter).second->UpdateState(start_ready_animations, NULL);
1189   }
1190 }
1191
1192 UIResourceId LayerTreeHost::CreateUIResource(UIResourceClient* client) {
1193   DCHECK(client);
1194
1195   UIResourceId next_id = next_ui_resource_id_++;
1196   DCHECK(ui_resource_client_map_.find(next_id) ==
1197          ui_resource_client_map_.end());
1198
1199   bool resource_lost = false;
1200   UIResourceRequest request(UIResourceRequest::UIResourceCreate,
1201                             next_id,
1202                             client->GetBitmap(next_id, resource_lost));
1203   ui_resource_request_queue_.push_back(request);
1204
1205   UIResourceClientData data;
1206   data.client = client;
1207   data.size = request.GetBitmap().GetSize();
1208
1209   ui_resource_client_map_[request.GetId()] = data;
1210   return request.GetId();
1211 }
1212
1213 // Deletes a UI resource.  May safely be called more than once.
1214 void LayerTreeHost::DeleteUIResource(UIResourceId uid) {
1215   UIResourceClientMap::iterator iter = ui_resource_client_map_.find(uid);
1216   if (iter == ui_resource_client_map_.end())
1217     return;
1218
1219   UIResourceRequest request(UIResourceRequest::UIResourceDelete, uid);
1220   ui_resource_request_queue_.push_back(request);
1221   ui_resource_client_map_.erase(iter);
1222 }
1223
1224 void LayerTreeHost::RecreateUIResources() {
1225   for (UIResourceClientMap::iterator iter = ui_resource_client_map_.begin();
1226        iter != ui_resource_client_map_.end();
1227        ++iter) {
1228     UIResourceId uid = iter->first;
1229     const UIResourceClientData& data = iter->second;
1230     bool resource_lost = true;
1231     UIResourceRequest request(UIResourceRequest::UIResourceCreate,
1232                               uid,
1233                               data.client->GetBitmap(uid, resource_lost));
1234     ui_resource_request_queue_.push_back(request);
1235   }
1236 }
1237
1238 // Returns the size of a resource given its id.
1239 gfx::Size LayerTreeHost::GetUIResourceSize(UIResourceId uid) const {
1240   UIResourceClientMap::const_iterator iter = ui_resource_client_map_.find(uid);
1241   if (iter == ui_resource_client_map_.end())
1242     return gfx::Size();
1243
1244   const UIResourceClientData& data = iter->second;
1245   return data.size;
1246 }
1247
1248 void LayerTreeHost::RegisterViewportLayers(
1249     scoped_refptr<Layer> page_scale_layer,
1250     scoped_refptr<Layer> inner_viewport_scroll_layer,
1251     scoped_refptr<Layer> outer_viewport_scroll_layer) {
1252   page_scale_layer_ = page_scale_layer;
1253   inner_viewport_scroll_layer_ = inner_viewport_scroll_layer;
1254   outer_viewport_scroll_layer_ = outer_viewport_scroll_layer;
1255 }
1256
1257 void LayerTreeHost::RegisterSelection(const LayerSelectionBound& start,
1258                                       const LayerSelectionBound& end) {
1259   if (selection_start_ == start && selection_end_ == end)
1260     return;
1261
1262   selection_start_ = start;
1263   selection_end_ = end;
1264   SetNeedsCommit();
1265 }
1266
1267 int LayerTreeHost::ScheduleMicroBenchmark(
1268     const std::string& benchmark_name,
1269     scoped_ptr<base::Value> value,
1270     const MicroBenchmark::DoneCallback& callback) {
1271   return micro_benchmark_controller_.ScheduleRun(
1272       benchmark_name, value.Pass(), callback);
1273 }
1274
1275 bool LayerTreeHost::SendMessageToMicroBenchmark(int id,
1276                                                 scoped_ptr<base::Value> value) {
1277   return micro_benchmark_controller_.SendMessage(id, value.Pass());
1278 }
1279
1280 void LayerTreeHost::InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor) {
1281   swap_promise_monitor_.insert(monitor);
1282 }
1283
1284 void LayerTreeHost::RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor) {
1285   swap_promise_monitor_.erase(monitor);
1286 }
1287
1288 void LayerTreeHost::NotifySwapPromiseMonitorsOfSetNeedsCommit() {
1289   std::set<SwapPromiseMonitor*>::iterator it = swap_promise_monitor_.begin();
1290   for (; it != swap_promise_monitor_.end(); it++)
1291     (*it)->OnSetNeedsCommitOnMain();
1292 }
1293
1294 void LayerTreeHost::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
1295   DCHECK(swap_promise);
1296   swap_promise_list_.push_back(swap_promise.Pass());
1297 }
1298
1299 void LayerTreeHost::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
1300   for (size_t i = 0; i < swap_promise_list_.size(); i++)
1301     swap_promise_list_[i]->DidNotSwap(reason);
1302   swap_promise_list_.clear();
1303 }
1304
1305 }  // namespace cc