cc/trees/layer_tree_impl.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_impl.h"
   6
   7 #include <algorithm>
   8 #include <limits>
   9 #include <set>
  10
  11 #include "base/trace_event/trace_event.h"
  12 #include "base/trace_event/trace_event_argument.h"
  13 #include "cc/animation/animation_host.h"
  14 #include "cc/animation/keyframed_animation_curve.h"
  15 #include "cc/animation/scrollbar_animation_controller.h"
  16 #include "cc/animation/scrollbar_animation_controller_linear_fade.h"
  17 #include "cc/animation/scrollbar_animation_controller_thinning.h"
  18 #include "cc/base/math_util.h"
  19 #include "cc/base/synced_property.h"
  20 #include "cc/debug/devtools_instrumentation.h"
  21 #include "cc/debug/traced_value.h"
  22 #include "cc/input/page_scale_animation.h"
  23 #include "cc/layers/heads_up_display_layer_impl.h"
  24 #include "cc/layers/layer.h"
  25 #include "cc/layers/layer_iterator.h"
  26 #include "cc/layers/render_surface_impl.h"
  27 #include "cc/layers/scrollbar_layer_impl_base.h"
  28 #include "cc/resources/ui_resource_request.h"
  29 #include "cc/trees/layer_tree_host_common.h"
  30 #include "cc/trees/layer_tree_host_impl.h"
  31 #include "cc/trees/occlusion_tracker.h"
  32 #include "cc/trees/property_tree.h"
  33 #include "cc/trees/property_tree_builder.h"
  34 #include "ui/gfx/geometry/box_f.h"
  35 #include "ui/gfx/geometry/point_conversions.h"
  36 #include "ui/gfx/geometry/size_conversions.h"
  37 #include "ui/gfx/geometry/vector2d_conversions.h"
  38
  39 namespace cc {
  40
  41 LayerTreeImpl::LayerTreeImpl(
  42     LayerTreeHostImpl* layer_tree_host_impl,
  43     scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
  44     scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
  45     scoped_refptr<SyncedElasticOverscroll> elastic_overscroll)
  46     : layer_tree_host_impl_(layer_tree_host_impl),
  47       source_frame_number_(-1),
  48       hud_layer_(0),
  49       background_color_(0),
  50       has_transparent_background_(false),
  51       currently_scrolling_layer_id_(Layer::INVALID_ID),
  52       overscroll_elasticity_layer_id_(Layer::INVALID_ID),
  53       page_scale_layer_id_(Layer::INVALID_ID),
  54       inner_viewport_scroll_layer_id_(Layer::INVALID_ID),
  55       outer_viewport_scroll_layer_id_(Layer::INVALID_ID),
  56       page_scale_factor_(page_scale_factor),
  57       min_page_scale_factor_(0),
  58       max_page_scale_factor_(0),
  59       hide_pinch_scrollbars_near_min_scale_(false),
  60       elastic_overscroll_(elastic_overscroll),
  61       viewport_size_invalid_(false),
  62       needs_update_draw_properties_(true),
  63       needs_full_tree_sync_(true),
  64       next_activation_forces_redraw_(false),
  65       has_ever_been_drawn_(false),
  66       render_surface_layer_list_id_(0),
  67       top_controls_shrink_blink_size_(false),
  68       top_controls_height_(0),
  69       top_controls_shown_ratio_(top_controls_shown_ratio) {
  70 }
  71
  72 LayerTreeImpl::~LayerTreeImpl() {
  73   BreakSwapPromises(IsActiveTree() ? SwapPromise::SWAP_FAILS
  74                                    : SwapPromise::ACTIVATION_FAILS);
  75
  76   // Need to explicitly clear the tree prior to destroying this so that
  77   // the LayerTreeImpl pointer is still valid in the LayerImpl dtor.
  78   DCHECK(!root_layer_);
  79   DCHECK(layers_with_copy_output_request_.empty());
  80 }
  81
  82 void LayerTreeImpl::Shutdown() {
  83   root_layer_ = nullptr;
  84 }
  85
  86 void LayerTreeImpl::ReleaseResources() {
  87   if (root_layer_) {
  88     LayerTreeHostCommon::CallFunctionForSubtree(
  89         root_layer_.get(), [](LayerImpl* layer) { layer->ReleaseResources(); });
  90   }
  91 }
  92
  93 void LayerTreeImpl::RecreateResources() {
  94   if (root_layer_) {
  95     LayerTreeHostCommon::CallFunctionForSubtree(
  96         root_layer_.get(),
  97         [](LayerImpl* layer) { layer->RecreateResources(); });
  98   }
  99 }
 100
 101 void LayerTreeImpl::GatherFrameTimingRequestIds(
 102     std::vector<int64_t>* request_ids) {
 103   if (!root_layer_)
 104     return;
 105
 106   // TODO(vmpstr): Early out if there are no requests on any of the layers. For
 107   // that, we need to inform LayerTreeImpl whenever there are requests when we
 108   // get them.
 109   LayerTreeHostCommon::CallFunctionForSubtree(
 110       root_layer_.get(), [request_ids](LayerImpl* layer) {
 111         layer->GatherFrameTimingRequestIds(request_ids);
 112       });
 113 }
 114
 115 void LayerTreeImpl::SetRootLayer(scoped_ptr<LayerImpl> layer) {
 116   root_layer_ = layer.Pass();
 117
 118   layer_tree_host_impl_->OnCanDrawStateChangedForTree();
 119 }
 120
 121 LayerImpl* LayerTreeImpl::InnerViewportScrollLayer() const {
 122   return LayerById(inner_viewport_scroll_layer_id_);
 123 }
 124
 125 LayerImpl* LayerTreeImpl::OuterViewportScrollLayer() const {
 126   return LayerById(outer_viewport_scroll_layer_id_);
 127 }
 128
 129 gfx::ScrollOffset LayerTreeImpl::TotalScrollOffset() const {
 130   gfx::ScrollOffset offset;
 131
 132   if (InnerViewportScrollLayer())
 133     offset += InnerViewportScrollLayer()->CurrentScrollOffset();
 134
 135   if (OuterViewportScrollLayer())
 136     offset += OuterViewportScrollLayer()->CurrentScrollOffset();
 137
 138   return offset;
 139 }
 140
 141 gfx::ScrollOffset LayerTreeImpl::TotalMaxScrollOffset() const {
 142   gfx::ScrollOffset offset;
 143
 144   if (InnerViewportScrollLayer())
 145     offset += InnerViewportScrollLayer()->MaxScrollOffset();
 146
 147   if (OuterViewportScrollLayer())
 148     offset += OuterViewportScrollLayer()->MaxScrollOffset();
 149
 150   return offset;
 151 }
 152
 153 scoped_ptr<LayerImpl> LayerTreeImpl::DetachLayerTree() {
 154   render_surface_layer_list_.clear();
 155   set_needs_update_draw_properties();
 156   return root_layer_.Pass();
 157 }
 158
 159 static void UpdateClipTreeForBoundsDeltaOnLayer(LayerImpl* layer,
 160                                                 ClipTree* clip_tree) {
 161   if (layer && layer->masks_to_bounds()) {
 162     ClipNode* clip_node = clip_tree->Node(layer->clip_tree_index());
 163     if (clip_node) {
 164       DCHECK_EQ(layer->id(), clip_node->owner_id);
 165       gfx::Size bounds = layer->bounds();
 166       if (clip_node->data.clip.size() != bounds) {
 167         clip_node->data.clip.set_size(bounds);
 168         clip_tree->set_needs_update(true);
 169       }
 170     }
 171   }
 172 }
 173
 174 void LayerTreeImpl::UpdatePropertyTreesForBoundsDelta() {
 175   DCHECK(IsActiveTree());
 176   LayerImpl* inner_container = InnerViewportContainerLayer();
 177   LayerImpl* outer_container = OuterViewportContainerLayer();
 178
 179   UpdateClipTreeForBoundsDeltaOnLayer(inner_container,
 180                                       &property_trees_.clip_tree);
 181   UpdateClipTreeForBoundsDeltaOnLayer(InnerViewportScrollLayer(),
 182                                       &property_trees_.clip_tree);
 183   UpdateClipTreeForBoundsDeltaOnLayer(outer_container,
 184                                       &property_trees_.clip_tree);
 185
 186   TransformTree& transform_tree = property_trees_.transform_tree;
 187   if (inner_container)
 188     transform_tree.SetInnerViewportBoundsDelta(inner_container->bounds_delta());
 189   if (outer_container)
 190     transform_tree.SetOuterViewportBoundsDelta(outer_container->bounds_delta());
 191 }
 192
 193 void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {
 194   // The request queue should have been processed and does not require a push.
 195   DCHECK_EQ(ui_resource_request_queue_.size(), 0u);
 196
 197   target_tree->SetPropertyTrees(property_trees_);
 198
 199   if (next_activation_forces_redraw_) {
 200     target_tree->ForceRedrawNextActivation();
 201     next_activation_forces_redraw_ = false;
 202   }
 203
 204   target_tree->PassSwapPromises(&swap_promise_list_);
 205
 206   target_tree->set_top_controls_shrink_blink_size(
 207       top_controls_shrink_blink_size_);
 208   target_tree->set_top_controls_height(top_controls_height_);
 209   target_tree->PushTopControls(nullptr);
 210
 211   target_tree->set_hide_pinch_scrollbars_near_min_scale(
 212       hide_pinch_scrollbars_near_min_scale_);
 213
 214   // Active tree already shares the page_scale_factor object with pending
 215   // tree so only the limits need to be provided.
 216   target_tree->PushPageScaleFactorAndLimits(nullptr, min_page_scale_factor(),
 217                                             max_page_scale_factor());
 218   target_tree->elastic_overscroll()->PushPendingToActive();
 219
 220   target_tree->pending_page_scale_animation_ =
 221       pending_page_scale_animation_.Pass();
 222
 223   target_tree->SetViewportLayersFromIds(
 224       overscroll_elasticity_layer_id_, page_scale_layer_id_,
 225       inner_viewport_scroll_layer_id_, outer_viewport_scroll_layer_id_);
 226
 227   target_tree->RegisterSelection(selection_);
 228
 229   // This should match the property synchronization in
 230   // LayerTreeHost::finishCommitOnImplThread().
 231   target_tree->set_source_frame_number(source_frame_number());
 232   target_tree->set_background_color(background_color());
 233   target_tree->set_has_transparent_background(has_transparent_background());
 234
 235   if (ViewportSizeInvalid())
 236     target_tree->SetViewportSizeInvalid();
 237   else
 238     target_tree->ResetViewportSizeInvalid();
 239
 240   if (hud_layer())
 241     target_tree->set_hud_layer(static_cast<HeadsUpDisplayLayerImpl*>(
 242         LayerTreeHostCommon::FindLayerInSubtree(
 243             target_tree->root_layer(), hud_layer()->id())));
 244   else
 245     target_tree->set_hud_layer(NULL);
 246
 247   target_tree->has_ever_been_drawn_ = false;
 248 }
 249
 250 LayerImpl* LayerTreeImpl::InnerViewportContainerLayer() const {
 251   return InnerViewportScrollLayer()
 252              ? InnerViewportScrollLayer()->scroll_clip_layer()
 253              : NULL;
 254 }
 255
 256 LayerImpl* LayerTreeImpl::OuterViewportContainerLayer() const {
 257   return OuterViewportScrollLayer()
 258              ? OuterViewportScrollLayer()->scroll_clip_layer()
 259              : NULL;
 260 }
 261
 262 LayerImpl* LayerTreeImpl::CurrentlyScrollingLayer() const {
 263   DCHECK(IsActiveTree());
 264   return LayerById(currently_scrolling_layer_id_);
 265 }
 266
 267 void LayerTreeImpl::SetCurrentlyScrollingLayer(LayerImpl* layer) {
 268   int new_id = layer ? layer->id() : Layer::INVALID_ID;
 269   if (currently_scrolling_layer_id_ == new_id)
 270     return;
 271
 272   if (CurrentlyScrollingLayer() &&
 273       CurrentlyScrollingLayer()->scrollbar_animation_controller())
 274     CurrentlyScrollingLayer()->scrollbar_animation_controller()->DidScrollEnd();
 275   currently_scrolling_layer_id_ = new_id;
 276   if (layer && layer->scrollbar_animation_controller())
 277     layer->scrollbar_animation_controller()->DidScrollBegin();
 278 }
 279
 280 void LayerTreeImpl::ClearCurrentlyScrollingLayer() {
 281   SetCurrentlyScrollingLayer(NULL);
 282 }
 283
 284 namespace {
 285
 286 void ForceScrollbarParameterUpdateAfterScaleChange(LayerImpl* current_layer) {
 287   if (!current_layer)
 288     return;
 289
 290   while (current_layer) {
 291     current_layer->ScrollbarParametersDidChange(false);
 292     current_layer = current_layer->parent();
 293   }
 294 }
 295
 296 }  // namespace
 297
 298 float LayerTreeImpl::ClampPageScaleFactorToLimits(
 299     float page_scale_factor) const {
 300   if (min_page_scale_factor_ && page_scale_factor < min_page_scale_factor_)
 301     page_scale_factor = min_page_scale_factor_;
 302   else if (max_page_scale_factor_ && page_scale_factor > max_page_scale_factor_)
 303     page_scale_factor = max_page_scale_factor_;
 304   return page_scale_factor;
 305 }
 306
 307 void LayerTreeImpl::UpdatePropertyTreeScrollingAndAnimationFromMainThread() {
 308   // TODO(enne): This should get replaced by pulling out scrolling and
 309   // animations into their own trees.  Then scrolls and animations would have
 310   // their own ways of synchronizing across commits.  This occurs to push
 311   // updates from scrolling deltas on the compositor thread that have occurred
 312   // after begin frame and updates from animations that have ticked since begin
 313   // frame to a newly-committed property tree.
 314   if (!root_layer())
 315     return;
 316   LayerTreeHostCommon::CallFunctionForSubtree(
 317       root_layer(), [](LayerImpl* layer) {
 318         layer->UpdatePropertyTreeForScrollingAndAnimationIfNeeded();
 319       });
 320 }
 321
 322 void LayerTreeImpl::SetPageScaleOnActiveTree(float active_page_scale) {
 323   DCHECK(IsActiveTree());
 324   if (page_scale_factor()->SetCurrent(
 325           ClampPageScaleFactorToLimits(active_page_scale)))
 326     DidUpdatePageScale();
 327 }
 328
 329 void LayerTreeImpl::PushPageScaleFromMainThread(float page_scale_factor,
 330                                                 float min_page_scale_factor,
 331                                                 float max_page_scale_factor) {
 332   PushPageScaleFactorAndLimits(&page_scale_factor, min_page_scale_factor,
 333                                max_page_scale_factor);
 334 }
 335
 336 void LayerTreeImpl::PushPageScaleFactorAndLimits(const float* page_scale_factor,
 337                                                  float min_page_scale_factor,
 338                                                  float max_page_scale_factor) {
 339   DCHECK(page_scale_factor || IsActiveTree());
 340   bool changed_page_scale = false;
 341   if (page_scale_factor) {
 342     DCHECK(!IsActiveTree() || !layer_tree_host_impl_->pending_tree());
 343     changed_page_scale |= page_scale_factor_->Delta() != 1.f;
 344     // TODO(enne): Once CDP goes away, ignore this call below.  The only time
 345     // the property trees will differ is if there's been a page scale on the
 346     // compositor thread after the begin frame, which is the delta check above.
 347     changed_page_scale |=
 348         page_scale_factor_->PushFromMainThread(*page_scale_factor);
 349   }
 350   if (IsActiveTree()) {
 351     // TODO(enne): Pushing from pending to active should never require
 352     // DidUpdatePageScale.  The values should already be set by the fully
 353     // computed property trees being synced from one tree to another.  Remove
 354     // this once CDP goes away.
 355     changed_page_scale |= page_scale_factor_->PushPendingToActive();
 356   }
 357
 358   changed_page_scale |=
 359       SetPageScaleFactorLimits(min_page_scale_factor, max_page_scale_factor);
 360
 361   if (changed_page_scale)
 362     DidUpdatePageScale();
 363 }
 364
 365 void LayerTreeImpl::set_top_controls_shrink_blink_size(bool shrink) {
 366   if (top_controls_shrink_blink_size_ == shrink)
 367     return;
 368
 369   top_controls_shrink_blink_size_ = shrink;
 370   if (IsActiveTree())
 371     layer_tree_host_impl_->UpdateViewportContainerSizes();
 372 }
 373
 374 void LayerTreeImpl::set_top_controls_height(float top_controls_height) {
 375   if (top_controls_height_ == top_controls_height)
 376     return;
 377
 378   top_controls_height_ = top_controls_height;
 379   if (IsActiveTree())
 380     layer_tree_host_impl_->UpdateViewportContainerSizes();
 381 }
 382
 383 bool LayerTreeImpl::SetCurrentTopControlsShownRatio(float ratio) {
 384   ratio = std::max(ratio, 0.f);
 385   ratio = std::min(ratio, 1.f);
 386   return top_controls_shown_ratio_->SetCurrent(ratio);
 387 }
 388
 389 void LayerTreeImpl::PushTopControlsFromMainThread(
 390     float top_controls_shown_ratio) {
 391   PushTopControls(&top_controls_shown_ratio);
 392 }
 393
 394 void LayerTreeImpl::PushTopControls(const float* top_controls_shown_ratio) {
 395   DCHECK(top_controls_shown_ratio || IsActiveTree());
 396
 397   if (top_controls_shown_ratio) {
 398     DCHECK(!IsActiveTree() || !layer_tree_host_impl_->pending_tree());
 399     top_controls_shown_ratio_->PushFromMainThread(*top_controls_shown_ratio);
 400   }
 401   if (IsActiveTree()) {
 402     if (top_controls_shown_ratio_->PushPendingToActive())
 403       layer_tree_host_impl_->DidChangeTopControlsPosition();
 404   }
 405 }
 406
 407 bool LayerTreeImpl::SetPageScaleFactorLimits(float min_page_scale_factor,
 408                                              float max_page_scale_factor) {
 409   if (min_page_scale_factor == min_page_scale_factor_ &&
 410       max_page_scale_factor == max_page_scale_factor_)
 411     return false;
 412
 413   min_page_scale_factor_ = min_page_scale_factor;
 414   max_page_scale_factor_ = max_page_scale_factor;
 415
 416   return true;
 417 }
 418
 419 void LayerTreeImpl::DidUpdatePageScale() {
 420   if (IsActiveTree())
 421     page_scale_factor()->SetCurrent(
 422         ClampPageScaleFactorToLimits(current_page_scale_factor()));
 423
 424   set_needs_update_draw_properties();
 425
 426   if (PageScaleLayer() && PageScaleLayer()->transform_tree_index() != -1) {
 427     TransformNode* node = property_trees_.transform_tree.Node(
 428         PageScaleLayer()->transform_tree_index());
 429     node->data.post_local_scale_factor = current_page_scale_factor();
 430     node->data.needs_local_transform_update = true;
 431     // TODO(enne): property trees can't ask the layer these things, but
 432     // the page scale layer should *just* be the page scale.
 433     DCHECK_EQ(PageScaleLayer()->position().ToString(),
 434               gfx::PointF().ToString());
 435     DCHECK_EQ(PageScaleLayer()->transform_origin().ToString(),
 436               gfx::Point3F().ToString());
 437     node->data.update_post_local_transform(gfx::PointF(), gfx::Point3F());
 438     property_trees_.transform_tree.set_needs_update(true);
 439   }
 440
 441   ForceScrollbarParameterUpdateAfterScaleChange(PageScaleLayer());
 442   HideInnerViewportScrollbarsIfNeeded();
 443 }
 444
 445 void LayerTreeImpl::HideInnerViewportScrollbarsIfNeeded() {
 446   if (!InnerViewportContainerLayer())
 447     return;
 448
 449   LayerImpl::ScrollbarSet* scrollbars =
 450       InnerViewportContainerLayer()->scrollbars();
 451
 452   if (!scrollbars)
 453     return;
 454
 455   float minimum_scale_to_show_at = min_page_scale_factor() * 1.05f;
 456   bool hide_scrollbars =
 457       hide_pinch_scrollbars_near_min_scale_ &&
 458       (current_page_scale_factor() < minimum_scale_to_show_at);
 459
 460   for (LayerImpl::ScrollbarSet::iterator it = scrollbars->begin();
 461        it != scrollbars->end(); ++it)
 462     (*it)->SetHideLayerAndSubtree(hide_scrollbars);
 463 }
 464
 465 SyncedProperty<ScaleGroup>* LayerTreeImpl::page_scale_factor() {
 466   return page_scale_factor_.get();
 467 }
 468
 469 const SyncedProperty<ScaleGroup>* LayerTreeImpl::page_scale_factor() const {
 470   return page_scale_factor_.get();
 471 }
 472
 473 gfx::SizeF LayerTreeImpl::ScrollableViewportSize() const {
 474   if (!InnerViewportContainerLayer())
 475     return gfx::SizeF();
 476
 477   return gfx::ScaleSize(InnerViewportContainerLayer()->BoundsForScrolling(),
 478                         1.0f / current_page_scale_factor());
 479 }
 480
 481 gfx::Rect LayerTreeImpl::RootScrollLayerDeviceViewportBounds() const {
 482   LayerImpl* root_scroll_layer = OuterViewportScrollLayer()
 483                                      ? OuterViewportScrollLayer()
 484                                      : InnerViewportScrollLayer();
 485   if (!root_scroll_layer || root_scroll_layer->children().empty())
 486     return gfx::Rect();
 487   LayerImpl* layer = root_scroll_layer->children()[0];
 488   return MathUtil::MapEnclosingClippedRect(layer->screen_space_transform(),
 489                                            gfx::Rect(layer->bounds()));
 490 }
 491
 492 void LayerTreeImpl::ApplySentScrollAndScaleDeltasFromAbortedCommit() {
 493   DCHECK(IsActiveTree());
 494
 495   page_scale_factor()->AbortCommit();
 496   top_controls_shown_ratio()->AbortCommit();
 497   elastic_overscroll()->AbortCommit();
 498
 499   if (!root_layer())
 500     return;
 501
 502   LayerTreeHostCommon::CallFunctionForSubtree(
 503       root_layer(), [](LayerImpl* layer) {
 504         layer->ApplySentScrollDeltasFromAbortedCommit();
 505       });
 506 }
 507
 508 void LayerTreeImpl::SetViewportLayersFromIds(
 509     int overscroll_elasticity_layer_id,
 510     int page_scale_layer_id,
 511     int inner_viewport_scroll_layer_id,
 512     int outer_viewport_scroll_layer_id) {
 513   overscroll_elasticity_layer_id_ = overscroll_elasticity_layer_id;
 514   page_scale_layer_id_ = page_scale_layer_id;
 515   inner_viewport_scroll_layer_id_ = inner_viewport_scroll_layer_id;
 516   outer_viewport_scroll_layer_id_ = outer_viewport_scroll_layer_id;
 517
 518   HideInnerViewportScrollbarsIfNeeded();
 519 }
 520
 521 void LayerTreeImpl::ClearViewportLayers() {
 522   overscroll_elasticity_layer_id_ = Layer::INVALID_ID;
 523   page_scale_layer_id_ = Layer::INVALID_ID;
 524   inner_viewport_scroll_layer_id_ = Layer::INVALID_ID;
 525   outer_viewport_scroll_layer_id_ = Layer::INVALID_ID;
 526 }
 527
 528 bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
 529   if (!needs_update_draw_properties_)
 530     return true;
 531
 532   // Calling UpdateDrawProperties must clear this flag, so there can be no
 533   // early outs before this.
 534   needs_update_draw_properties_ = false;
 535
 536   // For max_texture_size.  When the renderer is re-created in
 537   // CreateAndSetRenderer, the needs update draw properties flag is set
 538   // again.
 539   if (!layer_tree_host_impl_->renderer())
 540     return false;
 541
 542   // Clear this after the renderer early out, as it should still be
 543   // possible to hit test even without a renderer.
 544   render_surface_layer_list_.clear();
 545
 546   if (!root_layer())
 547     return false;
 548
 549   {
 550     TRACE_EVENT2(
 551         "cc", "LayerTreeImpl::UpdateDrawProperties::CalculateDrawProperties",
 552         "IsActive", IsActiveTree(), "SourceFrameNumber", source_frame_number_);
 553     bool can_render_to_separate_surface =
 554         (layer_tree_host_impl_->GetDrawMode() !=
 555          DRAW_MODE_RESOURCELESS_SOFTWARE);
 556
 557     ++render_surface_layer_list_id_;
 558
 559     LayerTreeHostCommon::CalcDrawPropsImplInputs inputs(
 560         root_layer(), DrawViewportSize(),
 561         layer_tree_host_impl_->DrawTransform(), device_scale_factor(),
 562         current_page_scale_factor(), PageScaleLayer(),
 563         InnerViewportScrollLayer(), OuterViewportScrollLayer(),
 564         elastic_overscroll()->Current(IsActiveTree()),
 565         OverscrollElasticityLayer(), resource_provider()->max_texture_size(),
 566         settings().can_use_lcd_text, settings().layers_always_allowed_lcd_text,
 567         can_render_to_separate_surface,
 568         settings().layer_transforms_should_scale_layer_contents,
 569         settings().verify_property_trees, &render_surface_layer_list_,
 570         render_surface_layer_list_id_, &property_trees_);
 571     LayerTreeHostCommon::CalculateDrawProperties(&inputs);
 572   }
 573
 574   {
 575     TRACE_EVENT2("cc", "LayerTreeImpl::UpdateDrawProperties::Occlusion",
 576                  "IsActive", IsActiveTree(), "SourceFrameNumber",
 577                  source_frame_number_);
 578     OcclusionTracker occlusion_tracker(
 579         root_layer()->render_surface()->content_rect());
 580     occlusion_tracker.set_minimum_tracking_size(
 581         settings().minimum_occlusion_tracking_size);
 582
 583     // LayerIterator is used here instead of CallFunctionForSubtree to only
 584     // UpdateTilePriorities on layers that will be visible (and thus have valid
 585     // draw properties) and not because any ordering is required.
 586     LayerIterator end = LayerIterator::End(&render_surface_layer_list_);
 587     for (LayerIterator it = LayerIterator::Begin(&render_surface_layer_list_);
 588          it != end; ++it) {
 589       occlusion_tracker.EnterLayer(it);
 590
 591       // There are very few render targets so this should be cheap to do for
 592       // each layer instead of something more complicated.
 593       bool inside_replica = false;
 594       LayerImpl* layer = it->render_target();
 595       while (layer && !inside_replica) {
 596         if (layer->render_target()->has_replica())
 597           inside_replica = true;
 598         layer = layer->render_target()->parent();
 599       }
 600
 601       // Don't use occlusion if a layer will appear in a replica, since the
 602       // tile raster code does not know how to look for the replica and would
 603       // consider it occluded even though the replica is visible.
 604       // Since occlusion is only used for browser compositor (i.e.
 605       // use_occlusion_for_tile_prioritization) and it won't use replicas,
 606       // this should matter not.
 607
 608       if (it.represents_itself()) {
 609         Occlusion occlusion =
 610             inside_replica ? Occlusion()
 611                            : occlusion_tracker.GetCurrentOcclusionForLayer(
 612                                  it->draw_transform());
 613         it->draw_properties().occlusion_in_content_space = occlusion;
 614       }
 615
 616       if (it.represents_contributing_render_surface()) {
 617         // Surfaces aren't used by the tile raster code, so they can have
 618         // occlusion regardless of replicas.
 619         Occlusion occlusion =
 620             occlusion_tracker.GetCurrentOcclusionForContributingSurface(
 621                 it->render_surface()->draw_transform());
 622         it->render_surface()->set_occlusion_in_content_space(occlusion);
 623         // Masks are used to draw the contributing surface, so should have
 624         // the same occlusion as the surface (nothing inside the surface
 625         // occludes them).
 626         if (LayerImpl* mask = it->mask_layer()) {
 627           Occlusion mask_occlusion =
 628               inside_replica
 629                   ? Occlusion()
 630                   : occlusion_tracker.GetCurrentOcclusionForContributingSurface(
 631                         it->render_surface()->draw_transform() *
 632                         it->draw_transform());
 633           mask->draw_properties().occlusion_in_content_space = mask_occlusion;
 634         }
 635         if (LayerImpl* replica = it->replica_layer()) {
 636           if (LayerImpl* mask = replica->mask_layer())
 637             mask->draw_properties().occlusion_in_content_space = Occlusion();
 638         }
 639       }
 640
 641       occlusion_tracker.LeaveLayer(it);
 642     }
 643
 644     unoccluded_screen_space_region_ =
 645         occlusion_tracker.ComputeVisibleRegionInScreen();
 646   }
 647
 648   // It'd be ideal if this could be done earlier, but when the raster source
 649   // is updated from the main thread during push properties, update draw
 650   // properties has not occurred yet and so it's not clear whether or not the
 651   // layer can or cannot use lcd text.  So, this is the cleanup pass to
 652   // determine if the raster source needs to be replaced with a non-lcd
 653   // raster source due to draw properties.
 654   if (update_lcd_text) {
 655     // TODO(enne): Make LTHI::sync_tree return this value.
 656     LayerTreeImpl* sync_tree =
 657         layer_tree_host_impl_->proxy()->CommitToActiveTree()
 658             ? layer_tree_host_impl_->active_tree()
 659             : layer_tree_host_impl_->pending_tree();
 660     // If this is not the sync tree, then it is not safe to update lcd text
 661     // as it causes invalidations and the tiles may be in use.
 662     DCHECK_EQ(this, sync_tree);
 663     for (const auto& layer : picture_layers_)
 664       layer->UpdateCanUseLCDTextAfterCommit();
 665   }
 666
 667   {
 668     TRACE_EVENT_BEGIN2("cc", "LayerTreeImpl::UpdateDrawProperties::UpdateTiles",
 669                        "IsActive", IsActiveTree(), "SourceFrameNumber",
 670                        source_frame_number_);
 671     const bool resourceless_software_draw =
 672         (layer_tree_host_impl_->GetDrawMode() ==
 673          DRAW_MODE_RESOURCELESS_SOFTWARE);
 674     size_t layers_updated_count = 0;
 675     bool tile_priorities_updated = false;
 676     for (PictureLayerImpl* layer : picture_layers_) {
 677       if (!layer->IsDrawnRenderSurfaceLayerListMember())
 678         continue;
 679       ++layers_updated_count;
 680       tile_priorities_updated |= layer->UpdateTiles(resourceless_software_draw);
 681     }
 682
 683     if (tile_priorities_updated)
 684       DidModifyTilePriorities();
 685
 686     TRACE_EVENT_END1("cc", "LayerTreeImpl::UpdateTilePriorities",
 687                      "layers_updated_count", layers_updated_count);
 688   }
 689
 690   DCHECK(!needs_update_draw_properties_) <<
 691       "CalcDrawProperties should not set_needs_update_draw_properties()";
 692   return true;
 693 }
 694
 695 void LayerTreeImpl::BuildPropertyTreesForTesting() {
 696   LayerTreeHostCommon::PreCalculateMetaInformationForTesting(root_layer_.get());
 697   PropertyTreeBuilder::BuildPropertyTrees(
 698       root_layer_.get(), PageScaleLayer(), InnerViewportScrollLayer(),
 699       OuterViewportScrollLayer(), current_page_scale_factor(),
 700       device_scale_factor(), gfx::Rect(DrawViewportSize()),
 701       layer_tree_host_impl_->DrawTransform(), &property_trees_);
 702 }
 703
 704 const LayerImplList& LayerTreeImpl::RenderSurfaceLayerList() const {
 705   // If this assert triggers, then the list is dirty.
 706   DCHECK(!needs_update_draw_properties_);
 707   return render_surface_layer_list_;
 708 }
 709
 710 const Region& LayerTreeImpl::UnoccludedScreenSpaceRegion() const {
 711   // If this assert triggers, then the render_surface_layer_list_ is dirty, so
 712   // the unoccluded_screen_space_region_ is not valid anymore.
 713   DCHECK(!needs_update_draw_properties_);
 714   return unoccluded_screen_space_region_;
 715 }
 716
 717 gfx::SizeF LayerTreeImpl::ScrollableSize() const {
 718   LayerImpl* root_scroll_layer = OuterViewportScrollLayer()
 719                                      ? OuterViewportScrollLayer()
 720                                      : InnerViewportScrollLayer();
 721   if (!root_scroll_layer || root_scroll_layer->children().empty())
 722     return gfx::Size();
 723
 724   gfx::SizeF content_size =
 725       root_scroll_layer->children()[0]->BoundsForScrolling();
 726   gfx::SizeF viewport_size =
 727       root_scroll_layer->scroll_clip_layer()->BoundsForScrolling();
 728
 729   content_size.SetToMax(viewport_size);
 730   return content_size;
 731 }
 732
 733 LayerImpl* LayerTreeImpl::LayerById(int id) const {
 734   LayerIdMap::const_iterator iter = layer_id_map_.find(id);
 735   return iter != layer_id_map_.end() ? iter->second : NULL;
 736 }
 737
 738 void LayerTreeImpl::RegisterLayer(LayerImpl* layer) {
 739   DCHECK(!LayerById(layer->id()));
 740   layer_id_map_[layer->id()] = layer;
 741   if (layer_tree_host_impl_->animation_host())
 742     layer_tree_host_impl_->animation_host()->RegisterLayer(
 743         layer->id(),
 744         IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING);
 745 }
 746
 747 void LayerTreeImpl::UnregisterLayer(LayerImpl* layer) {
 748   DCHECK(LayerById(layer->id()));
 749   if (layer_tree_host_impl_->animation_host())
 750     layer_tree_host_impl_->animation_host()->UnregisterLayer(
 751         layer->id(),
 752         IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING);
 753   layer_id_map_.erase(layer->id());
 754 }
 755
 756 size_t LayerTreeImpl::NumLayers() {
 757   return layer_id_map_.size();
 758 }
 759
 760 void LayerTreeImpl::DidBecomeActive() {
 761   if (next_activation_forces_redraw_) {
 762     layer_tree_host_impl_->SetFullRootLayerDamage();
 763     next_activation_forces_redraw_ = false;
 764   }
 765
 766   // Always reset this flag on activation, as we would only have activated
 767   // if we were in a good state.
 768   layer_tree_host_impl_->ResetRequiresHighResToDraw();
 769
 770   if (root_layer()) {
 771     LayerTreeHostCommon::CallFunctionForSubtree(
 772         root_layer(), [](LayerImpl* layer) { layer->DidBecomeActive(); });
 773   }
 774
 775   for (auto* swap_promise : swap_promise_list_)
 776     swap_promise->DidActivate();
 777   devtools_instrumentation::DidActivateLayerTree(layer_tree_host_impl_->id(),
 778                                                  source_frame_number_);
 779 }
 780
 781 bool LayerTreeImpl::RequiresHighResToDraw() const {
 782   return layer_tree_host_impl_->RequiresHighResToDraw();
 783 }
 784
 785 bool LayerTreeImpl::ViewportSizeInvalid() const {
 786   return viewport_size_invalid_;
 787 }
 788
 789 void LayerTreeImpl::SetViewportSizeInvalid() {
 790   viewport_size_invalid_ = true;
 791   layer_tree_host_impl_->OnCanDrawStateChangedForTree();
 792 }
 793
 794 void LayerTreeImpl::ResetViewportSizeInvalid() {
 795   viewport_size_invalid_ = false;
 796   layer_tree_host_impl_->OnCanDrawStateChangedForTree();
 797 }
 798
 799 Proxy* LayerTreeImpl::proxy() const {
 800   return layer_tree_host_impl_->proxy();
 801 }
 802
 803 const LayerTreeSettings& LayerTreeImpl::settings() const {
 804   return layer_tree_host_impl_->settings();
 805 }
 806
 807 const LayerTreeDebugState& LayerTreeImpl::debug_state() const {
 808   return layer_tree_host_impl_->debug_state();
 809 }
 810
 811 const RendererCapabilitiesImpl& LayerTreeImpl::GetRendererCapabilities() const {
 812   return layer_tree_host_impl_->GetRendererCapabilities();
 813 }
 814
 815 ContextProvider* LayerTreeImpl::context_provider() const {
 816   return output_surface()->context_provider();
 817 }
 818
 819 OutputSurface* LayerTreeImpl::output_surface() const {
 820   return layer_tree_host_impl_->output_surface();
 821 }
 822
 823 ResourceProvider* LayerTreeImpl::resource_provider() const {
 824   return layer_tree_host_impl_->resource_provider();
 825 }
 826
 827 TileManager* LayerTreeImpl::tile_manager() const {
 828   return layer_tree_host_impl_->tile_manager();
 829 }
 830
 831 FrameRateCounter* LayerTreeImpl::frame_rate_counter() const {
 832   return layer_tree_host_impl_->fps_counter();
 833 }
 834
 835 MemoryHistory* LayerTreeImpl::memory_history() const {
 836   return layer_tree_host_impl_->memory_history();
 837 }
 838
 839 gfx::Size LayerTreeImpl::device_viewport_size() const {
 840   return layer_tree_host_impl_->device_viewport_size();
 841 }
 842
 843 float LayerTreeImpl::device_scale_factor() const {
 844   return layer_tree_host_impl_->device_scale_factor();
 845 }
 846
 847 DebugRectHistory* LayerTreeImpl::debug_rect_history() const {
 848   return layer_tree_host_impl_->debug_rect_history();
 849 }
 850
 851 bool LayerTreeImpl::IsActiveTree() const {
 852   return layer_tree_host_impl_->active_tree() == this;
 853 }
 854
 855 bool LayerTreeImpl::IsPendingTree() const {
 856   return layer_tree_host_impl_->pending_tree() == this;
 857 }
 858
 859 bool LayerTreeImpl::IsRecycleTree() const {
 860   return layer_tree_host_impl_->recycle_tree() == this;
 861 }
 862
 863 bool LayerTreeImpl::IsSyncTree() const {
 864   return layer_tree_host_impl_->sync_tree() == this;
 865 }
 866
 867 LayerImpl* LayerTreeImpl::FindActiveTreeLayerById(int id) {
 868   LayerTreeImpl* tree = layer_tree_host_impl_->active_tree();
 869   if (!tree)
 870     return NULL;
 871   return tree->LayerById(id);
 872 }
 873
 874 LayerImpl* LayerTreeImpl::FindPendingTreeLayerById(int id) {
 875   LayerTreeImpl* tree = layer_tree_host_impl_->pending_tree();
 876   if (!tree)
 877     return NULL;
 878   return tree->LayerById(id);
 879 }
 880
 881 bool LayerTreeImpl::PinchGestureActive() const {
 882   return layer_tree_host_impl_->pinch_gesture_active();
 883 }
 884
 885 BeginFrameArgs LayerTreeImpl::CurrentBeginFrameArgs() const {
 886   return layer_tree_host_impl_->CurrentBeginFrameArgs();
 887 }
 888
 889 base::TimeDelta LayerTreeImpl::CurrentBeginFrameInterval() const {
 890   return layer_tree_host_impl_->CurrentBeginFrameInterval();
 891 }
 892
 893 void LayerTreeImpl::SetNeedsCommit() {
 894   layer_tree_host_impl_->SetNeedsCommit();
 895 }
 896
 897 gfx::Rect LayerTreeImpl::DeviceViewport() const {
 898   return layer_tree_host_impl_->DeviceViewport();
 899 }
 900
 901 gfx::Size LayerTreeImpl::DrawViewportSize() const {
 902   return layer_tree_host_impl_->DrawViewportSize();
 903 }
 904
 905 const gfx::Rect LayerTreeImpl::ViewportRectForTilePriority() const {
 906   return layer_tree_host_impl_->ViewportRectForTilePriority();
 907 }
 908
 909 scoped_ptr<ScrollbarAnimationController>
 910 LayerTreeImpl::CreateScrollbarAnimationController(LayerImpl* scrolling_layer) {
 911   DCHECK(settings().scrollbar_fade_delay_ms);
 912   DCHECK(settings().scrollbar_fade_duration_ms);
 913   base::TimeDelta delay =
 914       base::TimeDelta::FromMilliseconds(settings().scrollbar_fade_delay_ms);
 915   base::TimeDelta resize_delay = base::TimeDelta::FromMilliseconds(
 916       settings().scrollbar_fade_resize_delay_ms);
 917   base::TimeDelta duration =
 918       base::TimeDelta::FromMilliseconds(settings().scrollbar_fade_duration_ms);
 919   switch (settings().scrollbar_animator) {
 920     case LayerTreeSettings::LINEAR_FADE: {
 921       return ScrollbarAnimationControllerLinearFade::Create(
 922           scrolling_layer,
 923           layer_tree_host_impl_,
 924           delay,
 925           resize_delay,
 926           duration);
 927     }
 928     case LayerTreeSettings::THINNING: {
 929       return ScrollbarAnimationControllerThinning::Create(scrolling_layer,
 930                                                           layer_tree_host_impl_,
 931                                                           delay,
 932                                                           resize_delay,
 933                                                           duration);
 934     }
 935     case LayerTreeSettings::NO_ANIMATOR:
 936       NOTREACHED();
 937       break;
 938   }
 939   return nullptr;
 940 }
 941
 942 void LayerTreeImpl::DidAnimateScrollOffset() {
 943   layer_tree_host_impl_->DidAnimateScrollOffset();
 944 }
 945
 946 bool LayerTreeImpl::use_gpu_rasterization() const {
 947   return layer_tree_host_impl_->use_gpu_rasterization();
 948 }
 949
 950 GpuRasterizationStatus LayerTreeImpl::GetGpuRasterizationStatus() const {
 951   return layer_tree_host_impl_->gpu_rasterization_status();
 952 }
 953
 954 bool LayerTreeImpl::create_low_res_tiling() const {
 955   return layer_tree_host_impl_->create_low_res_tiling();
 956 }
 957
 958 void LayerTreeImpl::SetNeedsRedraw() {
 959   layer_tree_host_impl_->SetNeedsRedraw();
 960 }
 961
 962 AnimationRegistrar* LayerTreeImpl::GetAnimationRegistrar() const {
 963   return layer_tree_host_impl_->animation_registrar();
 964 }
 965
 966 void LayerTreeImpl::GetAllPrioritizedTilesForTracing(
 967     std::vector<PrioritizedTile>* prioritized_tiles) const {
 968   LayerIterator end = LayerIterator::End(&render_surface_layer_list_);
 969   for (LayerIterator it = LayerIterator::Begin(&render_surface_layer_list_);
 970        it != end; ++it) {
 971     if (!it.represents_itself())
 972       continue;
 973     LayerImpl* layer_impl = *it;
 974     layer_impl->GetAllPrioritizedTilesForTracing(prioritized_tiles);
 975   }
 976 }
 977
 978 void LayerTreeImpl::AsValueInto(base::trace_event::TracedValue* state) const {
 979   TracedValue::MakeDictIntoImplicitSnapshot(state, "cc::LayerTreeImpl", this);
 980   state->SetInteger("source_frame_number", source_frame_number_);
 981
 982   state->BeginDictionary("root_layer");
 983   root_layer_->AsValueInto(state);
 984   state->EndDictionary();
 985
 986   state->BeginArray("render_surface_layer_list");
 987   LayerIterator end = LayerIterator::End(&render_surface_layer_list_);
 988   for (LayerIterator it = LayerIterator::Begin(&render_surface_layer_list_);
 989        it != end; ++it) {
 990     if (!it.represents_itself())
 991       continue;
 992     TracedValue::AppendIDRef(*it, state);
 993   }
 994   state->EndArray();
 995
 996   state->BeginArray("swap_promise_trace_ids");
 997   for (auto* swap_promise : swap_promise_list_)
 998     state->AppendDouble(swap_promise->TraceId());
 999   state->EndArray();
1000
1001   state->BeginArray("pinned_swap_promise_trace_ids");
1002   for (auto* swap_promise : pinned_swap_promise_list_)
1003     state->AppendDouble(swap_promise->TraceId());
1004   state->EndArray();
1005 }
1006
1007 void LayerTreeImpl::DistributeRootScrollOffset(
1008     const gfx::ScrollOffset& root_offset) {
1009   if (!InnerViewportScrollLayer())
1010     return;
1011
1012   DCHECK(OuterViewportScrollLayer());
1013
1014   // If we get here, we have both inner/outer viewports, and need to distribute
1015   // the scroll offset between them.
1016   gfx::ScrollOffset inner_viewport_offset =
1017       InnerViewportScrollLayer()->CurrentScrollOffset();
1018   gfx::ScrollOffset outer_viewport_offset =
1019       OuterViewportScrollLayer()->CurrentScrollOffset();
1020
1021   // It may be nothing has changed.
1022   DCHECK(inner_viewport_offset + outer_viewport_offset == TotalScrollOffset());
1023   if (inner_viewport_offset + outer_viewport_offset == root_offset)
1024     return;
1025
1026   gfx::ScrollOffset max_outer_viewport_scroll_offset =
1027       OuterViewportScrollLayer()->MaxScrollOffset();
1028
1029   outer_viewport_offset = root_offset - inner_viewport_offset;
1030   outer_viewport_offset.SetToMin(max_outer_viewport_scroll_offset);
1031   outer_viewport_offset.SetToMax(gfx::ScrollOffset());
1032
1033   OuterViewportScrollLayer()->SetCurrentScrollOffset(outer_viewport_offset);
1034   inner_viewport_offset = root_offset - outer_viewport_offset;
1035   InnerViewportScrollLayer()->SetCurrentScrollOffset(inner_viewport_offset);
1036 }
1037
1038 void LayerTreeImpl::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
1039   DCHECK(swap_promise);
1040   swap_promise_list_.push_back(swap_promise.Pass());
1041 }
1042
1043 void LayerTreeImpl::QueuePinnedSwapPromise(
1044     scoped_ptr<SwapPromise> swap_promise) {
1045   DCHECK(IsActiveTree());
1046   DCHECK(swap_promise);
1047   pinned_swap_promise_list_.push_back(swap_promise.Pass());
1048 }
1049
1050 void LayerTreeImpl::PassSwapPromises(
1051     ScopedPtrVector<SwapPromise>* new_swap_promise) {
1052   for (auto* swap_promise : swap_promise_list_)
1053     swap_promise->DidNotSwap(SwapPromise::SWAP_FAILS);
1054   swap_promise_list_.clear();
1055   swap_promise_list_.swap(*new_swap_promise);
1056 }
1057
1058 void LayerTreeImpl::FinishSwapPromises(CompositorFrameMetadata* metadata) {
1059   for (auto* swap_promise : swap_promise_list_)
1060     swap_promise->DidSwap(metadata);
1061   swap_promise_list_.clear();
1062   for (auto* swap_promise : pinned_swap_promise_list_)
1063     swap_promise->DidSwap(metadata);
1064   pinned_swap_promise_list_.clear();
1065 }
1066
1067 void LayerTreeImpl::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
1068   for (auto* swap_promise : swap_promise_list_)
1069     swap_promise->DidNotSwap(reason);
1070   swap_promise_list_.clear();
1071   for (auto* swap_promise : pinned_swap_promise_list_)
1072     swap_promise->DidNotSwap(reason);
1073   pinned_swap_promise_list_.clear();
1074 }
1075
1076 void LayerTreeImpl::DidModifyTilePriorities() {
1077   layer_tree_host_impl_->DidModifyTilePriorities();
1078 }
1079
1080 void LayerTreeImpl::set_ui_resource_request_queue(
1081     const UIResourceRequestQueue& queue) {
1082   ui_resource_request_queue_ = queue;
1083 }
1084
1085 ResourceId LayerTreeImpl::ResourceIdForUIResource(UIResourceId uid) const {
1086   return layer_tree_host_impl_->ResourceIdForUIResource(uid);
1087 }
1088
1089 bool LayerTreeImpl::IsUIResourceOpaque(UIResourceId uid) const {
1090   return layer_tree_host_impl_->IsUIResourceOpaque(uid);
1091 }
1092
1093 void LayerTreeImpl::ProcessUIResourceRequestQueue() {
1094   for (const auto& req : ui_resource_request_queue_) {
1095     switch (req.GetType()) {
1096       case UIResourceRequest::UI_RESOURCE_CREATE:
1097         layer_tree_host_impl_->CreateUIResource(req.GetId(), req.GetBitmap());
1098         break;
1099       case UIResourceRequest::UI_RESOURCE_DELETE:
1100         layer_tree_host_impl_->DeleteUIResource(req.GetId());
1101         break;
1102       case UIResourceRequest::UI_RESOURCE_INVALID_REQUEST:
1103         NOTREACHED();
1104         break;
1105     }
1106   }
1107   ui_resource_request_queue_.clear();
1108
1109   // If all UI resource evictions were not recreated by processing this queue,
1110   // then another commit is required.
1111   if (layer_tree_host_impl_->EvictedUIResourcesExist())
1112     layer_tree_host_impl_->SetNeedsCommit();
1113 }
1114
1115 void LayerTreeImpl::RegisterPictureLayerImpl(PictureLayerImpl* layer) {
1116   DCHECK(std::find(picture_layers_.begin(), picture_layers_.end(), layer) ==
1117          picture_layers_.end());
1118   picture_layers_.push_back(layer);
1119 }
1120
1121 void LayerTreeImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
1122   std::vector<PictureLayerImpl*>::iterator it =
1123       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
1124   DCHECK(it != picture_layers_.end());
1125   picture_layers_.erase(it);
1126 }
1127
1128 void LayerTreeImpl::AddLayerWithCopyOutputRequest(LayerImpl* layer) {
1129   // Only the active tree needs to know about layers with copy requests, as
1130   // they are aborted if not serviced during draw.
1131   DCHECK(IsActiveTree());
1132
1133   // DCHECK(std::find(layers_with_copy_output_request_.begin(),
1134   //                 layers_with_copy_output_request_.end(),
1135   //                 layer) == layers_with_copy_output_request_.end());
1136   // TODO(danakj): Remove this once crash is found crbug.com/309777
1137   for (size_t i = 0; i < layers_with_copy_output_request_.size(); ++i) {
1138     CHECK(layers_with_copy_output_request_[i] != layer)
1139         << i << " of " << layers_with_copy_output_request_.size();
1140   }
1141   layers_with_copy_output_request_.push_back(layer);
1142 }
1143
1144 void LayerTreeImpl::RemoveLayerWithCopyOutputRequest(LayerImpl* layer) {
1145   // Only the active tree needs to know about layers with copy requests, as
1146   // they are aborted if not serviced during draw.
1147   DCHECK(IsActiveTree());
1148
1149   std::vector<LayerImpl*>::iterator it = std::find(
1150       layers_with_copy_output_request_.begin(),
1151       layers_with_copy_output_request_.end(),
1152       layer);
1153   DCHECK(it != layers_with_copy_output_request_.end());
1154   layers_with_copy_output_request_.erase(it);
1155
1156   // TODO(danakj): Remove this once crash is found crbug.com/309777
1157   for (size_t i = 0; i < layers_with_copy_output_request_.size(); ++i) {
1158     CHECK(layers_with_copy_output_request_[i] != layer)
1159         << i << " of " << layers_with_copy_output_request_.size();
1160   }
1161 }
1162
1163 const std::vector<LayerImpl*>& LayerTreeImpl::LayersWithCopyOutputRequest()
1164     const {
1165   // Only the active tree needs to know about layers with copy requests, as
1166   // they are aborted if not serviced during draw.
1167   DCHECK(IsActiveTree());
1168
1169   return layers_with_copy_output_request_;
1170 }
1171
1172 template <typename LayerType>
1173 static inline bool LayerClipsSubtree(LayerType* layer) {
1174   return layer->masks_to_bounds() || layer->mask_layer();
1175 }
1176
1177 static bool PointHitsRect(
1178     const gfx::PointF& screen_space_point,
1179     const gfx::Transform& local_space_to_screen_space_transform,
1180     const gfx::Rect& local_space_rect,
1181     float* distance_to_camera) {
1182   // If the transform is not invertible, then assume that this point doesn't hit
1183   // this rect.
1184   gfx::Transform inverse_local_space_to_screen_space(
1185       gfx::Transform::kSkipInitialization);
1186   if (!local_space_to_screen_space_transform.GetInverse(
1187           &inverse_local_space_to_screen_space))
1188     return false;
1189
1190   // Transform the hit test point from screen space to the local space of the
1191   // given rect.
1192   bool clipped = false;
1193   gfx::Point3F planar_point = MathUtil::ProjectPoint3D(
1194       inverse_local_space_to_screen_space, screen_space_point, &clipped);
1195   gfx::PointF hit_test_point_in_local_space =
1196       gfx::PointF(planar_point.x(), planar_point.y());
1197
1198   // If ProjectPoint could not project to a valid value, then we assume that
1199   // this point doesn't hit this rect.
1200   if (clipped)
1201     return false;
1202
1203   if (!gfx::RectF(local_space_rect).Contains(hit_test_point_in_local_space))
1204     return false;
1205
1206   if (distance_to_camera) {
1207     // To compute the distance to the camera, we have to take the planar point
1208     // and pull it back to world space and compute the displacement along the
1209     // z-axis.
1210     gfx::Point3F planar_point_in_screen_space(planar_point);
1211     local_space_to_screen_space_transform.TransformPoint(
1212         &planar_point_in_screen_space);
1213     *distance_to_camera = planar_point_in_screen_space.z();
1214   }
1215
1216   return true;
1217 }
1218
1219 static bool PointHitsRegion(const gfx::PointF& screen_space_point,
1220                             const gfx::Transform& screen_space_transform,
1221                             const Region& layer_space_region) {
1222   // If the transform is not invertible, then assume that this point doesn't hit
1223   // this region.
1224   gfx::Transform inverse_screen_space_transform(
1225       gfx::Transform::kSkipInitialization);
1226   if (!screen_space_transform.GetInverse(&inverse_screen_space_transform))
1227     return false;
1228
1229   // Transform the hit test point from screen space to the local space of the
1230   // given region.
1231   bool clipped = false;
1232   gfx::PointF hit_test_point_in_layer_space = MathUtil::ProjectPoint(
1233       inverse_screen_space_transform, screen_space_point, &clipped);
1234
1235   // If ProjectPoint could not project to a valid value, then we assume that
1236   // this point doesn't hit this region.
1237   if (clipped)
1238     return false;
1239
1240   return layer_space_region.Contains(
1241       gfx::ToRoundedPoint(hit_test_point_in_layer_space));
1242 }
1243
1244 static const LayerImpl* GetNextClippingLayer(const LayerImpl* layer) {
1245   if (layer->scroll_parent())
1246     return layer->scroll_parent();
1247   if (layer->clip_parent())
1248     return layer->clip_parent();
1249   return layer->parent();
1250 }
1251
1252 static bool PointIsClippedBySurfaceOrClipRect(
1253     const gfx::PointF& screen_space_point,
1254     const LayerImpl* layer) {
1255   // Walk up the layer tree and hit-test any render_surfaces and any layer
1256   // clip rects that are active.
1257   for (; layer; layer = GetNextClippingLayer(layer)) {
1258     if (layer->render_surface() &&
1259         !PointHitsRect(screen_space_point,
1260                        layer->render_surface()->screen_space_transform(),
1261                        layer->render_surface()->content_rect(),
1262                        NULL))
1263       return true;
1264
1265     if (LayerClipsSubtree(layer) &&
1266         !PointHitsRect(screen_space_point, layer->screen_space_transform(),
1267                        gfx::Rect(layer->bounds()), NULL))
1268       return true;
1269   }
1270
1271   // If we have finished walking all ancestors without having already exited,
1272   // then the point is not clipped by any ancestors.
1273   return false;
1274 }
1275
1276 static bool PointHitsLayer(const LayerImpl* layer,
1277                            const gfx::PointF& screen_space_point,
1278                            float* distance_to_intersection) {
1279   gfx::Rect content_rect(layer->bounds());
1280   if (!PointHitsRect(screen_space_point,
1281                      layer->screen_space_transform(),
1282                      content_rect,
1283                      distance_to_intersection))
1284     return false;
1285
1286   // At this point, we think the point does hit the layer, but we need to walk
1287   // up the parents to ensure that the layer was not clipped in such a way
1288   // that the hit point actually should not hit the layer.
1289   if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer))
1290     return false;
1291
1292   // Skip the HUD layer.
1293   if (layer == layer->layer_tree_impl()->hud_layer())
1294     return false;
1295
1296   return true;
1297 }
1298
1299 struct FindClosestMatchingLayerDataForRecursion {
1300   FindClosestMatchingLayerDataForRecursion()
1301       : closest_match(NULL),
1302         closest_distance(-std::numeric_limits<float>::infinity()) {}
1303   LayerImpl* closest_match;
1304   // Note that the positive z-axis points towards the camera, so bigger means
1305   // closer in this case, counterintuitively.
1306   float closest_distance;
1307 };
1308
1309 template <typename Functor>
1310 static void FindClosestMatchingLayer(
1311     const gfx::PointF& screen_space_point,
1312     LayerImpl* layer,
1313     const Functor& func,
1314     FindClosestMatchingLayerDataForRecursion* data_for_recursion) {
1315   size_t children_size = layer->children().size();
1316   for (size_t i = 0; i < children_size; ++i) {
1317     size_t index = children_size - 1 - i;
1318     FindClosestMatchingLayer(screen_space_point, layer->children()[index], func,
1319                              data_for_recursion);
1320   }
1321
1322   float distance_to_intersection = 0.f;
1323   if (func(layer) &&
1324       PointHitsLayer(layer, screen_space_point, &distance_to_intersection) &&
1325       ((!data_for_recursion->closest_match ||
1326         distance_to_intersection > data_for_recursion->closest_distance))) {
1327     data_for_recursion->closest_distance = distance_to_intersection;
1328     data_for_recursion->closest_match = layer;
1329   }
1330 }
1331
1332 static bool ScrollsAnyDrawnRenderSurfaceLayerListMember(LayerImpl* layer) {
1333   if (!layer->scrollable())
1334     return false;
1335   if (layer->layer_or_descendant_is_drawn())
1336     return true;
1337
1338   if (!layer->scroll_children())
1339     return false;
1340   for (std::set<LayerImpl*>::const_iterator it =
1341            layer->scroll_children()->begin();
1342        it != layer->scroll_children()->end();
1343        ++it) {
1344     if ((*it)->layer_or_descendant_is_drawn())
1345       return true;
1346   }
1347   return false;
1348 }
1349
1350 struct FindScrollingLayerFunctor {
1351   bool operator()(LayerImpl* layer) const {
1352     return ScrollsAnyDrawnRenderSurfaceLayerListMember(layer);
1353   }
1354 };
1355
1356 LayerImpl* LayerTreeImpl::FindFirstScrollingLayerThatIsHitByPoint(
1357     const gfx::PointF& screen_space_point) {
1358   FindClosestMatchingLayerDataForRecursion data_for_recursion;
1359   FindClosestMatchingLayer(screen_space_point,
1360                            root_layer(),
1361                            FindScrollingLayerFunctor(),
1362                            &data_for_recursion);
1363   return data_for_recursion.closest_match;
1364 }
1365
1366 struct HitTestVisibleScrollableOrTouchableFunctor {
1367   bool operator()(LayerImpl* layer) const {
1368     return layer->IsDrawnRenderSurfaceLayerListMember() ||
1369            ScrollsAnyDrawnRenderSurfaceLayerListMember(layer) ||
1370            !layer->touch_event_handler_region().IsEmpty() ||
1371            layer->have_wheel_event_handlers();
1372   }
1373 };
1374
1375 LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPoint(
1376     const gfx::PointF& screen_space_point) {
1377   if (!root_layer())
1378     return NULL;
1379   bool update_lcd_text = false;
1380   if (!UpdateDrawProperties(update_lcd_text))
1381     return NULL;
1382   FindClosestMatchingLayerDataForRecursion data_for_recursion;
1383   FindClosestMatchingLayer(screen_space_point,
1384                            root_layer(),
1385                            HitTestVisibleScrollableOrTouchableFunctor(),
1386                            &data_for_recursion);
1387   return data_for_recursion.closest_match;
1388 }
1389
1390 static bool LayerHasTouchEventHandlersAt(const gfx::PointF& screen_space_point,
1391                                          LayerImpl* layer_impl) {
1392   if (layer_impl->touch_event_handler_region().IsEmpty())
1393     return false;
1394
1395   if (!PointHitsRegion(screen_space_point, layer_impl->screen_space_transform(),
1396                        layer_impl->touch_event_handler_region()))
1397     return false;
1398
1399   // At this point, we think the point does hit the touch event handler region
1400   // on the layer, but we need to walk up the parents to ensure that the layer
1401   // was not clipped in such a way that the hit point actually should not hit
1402   // the layer.
1403   if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl))
1404     return false;
1405
1406   return true;
1407 }
1408
1409 struct FindWheelEventLayerFunctor {
1410   bool operator()(LayerImpl* layer) const {
1411     return layer->have_wheel_event_handlers();
1412   }
1413 };
1414
1415 LayerImpl* LayerTreeImpl::FindLayerWithWheelHandlerThatIsHitByPoint(
1416     const gfx::PointF& screen_space_point) {
1417   if (!root_layer())
1418     return NULL;
1419   bool update_lcd_text = false;
1420   if (!UpdateDrawProperties(update_lcd_text))
1421     return NULL;
1422   FindWheelEventLayerFunctor func;
1423   FindClosestMatchingLayerDataForRecursion data_for_recursion;
1424   FindClosestMatchingLayer(screen_space_point, root_layer(), func,
1425                            &data_for_recursion);
1426   return data_for_recursion.closest_match;
1427 }
1428
1429 struct FindTouchEventLayerFunctor {
1430   bool operator()(LayerImpl* layer) const {
1431     return LayerHasTouchEventHandlersAt(screen_space_point, layer);
1432   }
1433   const gfx::PointF screen_space_point;
1434 };
1435
1436 LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPointInTouchHandlerRegion(
1437     const gfx::PointF& screen_space_point) {
1438   if (!root_layer())
1439     return NULL;
1440   bool update_lcd_text = false;
1441   if (!UpdateDrawProperties(update_lcd_text))
1442     return NULL;
1443   FindTouchEventLayerFunctor func = {screen_space_point};
1444   FindClosestMatchingLayerDataForRecursion data_for_recursion;
1445   FindClosestMatchingLayer(
1446       screen_space_point, root_layer(), func, &data_for_recursion);
1447   return data_for_recursion.closest_match;
1448 }
1449
1450 void LayerTreeImpl::RegisterSelection(const LayerSelection& selection) {
1451   selection_ = selection;
1452 }
1453
1454 static ViewportSelectionBound ComputeViewportSelectionBound(
1455     const LayerSelectionBound& layer_bound,
1456     LayerImpl* layer,
1457     float device_scale_factor) {
1458   ViewportSelectionBound viewport_bound;
1459   viewport_bound.type = layer_bound.type;
1460
1461   if (!layer || layer_bound.type == SELECTION_BOUND_EMPTY)
1462     return viewport_bound;
1463
1464   gfx::PointF layer_top = layer_bound.edge_top;
1465   gfx::PointF layer_bottom = layer_bound.edge_bottom;
1466
1467   bool clipped = false;
1468   gfx::PointF screen_top =
1469       MathUtil::MapPoint(layer->screen_space_transform(), layer_top, &clipped);
1470   gfx::PointF screen_bottom = MathUtil::MapPoint(
1471       layer->screen_space_transform(), layer_bottom, &clipped);
1472
1473   // MapPoint can produce points with NaN components (even when no inputs are
1474   // NaN). Since consumers of ViewportSelectionBounds may round |edge_top| or
1475   // |edge_bottom| (and since rounding will crash on NaN), we return an empty
1476   // bound instead.
1477   if (std::isnan(screen_top.x()) || std::isnan(screen_top.y()) ||
1478       std::isnan(screen_bottom.x()) || std::isnan(screen_bottom.y()))
1479     return ViewportSelectionBound();
1480
1481   const float inv_scale = 1.f / device_scale_factor;
1482   viewport_bound.edge_top = gfx::ScalePoint(screen_top, inv_scale);
1483   viewport_bound.edge_bottom = gfx::ScalePoint(screen_bottom, inv_scale);
1484
1485   // The bottom edge point is used for visibility testing as it is the logical
1486   // focal point for bound selection handles (this may change in the future).
1487   // Shifting the visibility point fractionally inward ensures that neighboring
1488   // or logically coincident layers aligned to integral DPI coordinates will not
1489   // spuriously occlude the bound.
1490   gfx::Vector2dF visibility_offset = layer_top - layer_bottom;
1491   visibility_offset.Scale(device_scale_factor / visibility_offset.Length());
1492   gfx::PointF visibility_point = layer_bottom + visibility_offset;
1493   if (visibility_point.x() <= 0)
1494     visibility_point.set_x(visibility_point.x() + device_scale_factor);
1495   visibility_point = MathUtil::MapPoint(
1496       layer->screen_space_transform(), visibility_point, &clipped);
1497
1498   float intersect_distance = 0.f;
1499   viewport_bound.visible =
1500       PointHitsLayer(layer, visibility_point, &intersect_distance);
1501
1502   return viewport_bound;
1503 }
1504
1505 void LayerTreeImpl::GetViewportSelection(ViewportSelection* selection) {
1506   DCHECK(selection);
1507
1508   selection->start = ComputeViewportSelectionBound(
1509       selection_.start,
1510       selection_.start.layer_id ? LayerById(selection_.start.layer_id) : NULL,
1511       device_scale_factor());
1512   selection->is_editable = selection_.is_editable;
1513   selection->is_empty_text_form_control = selection_.is_empty_text_form_control;
1514   if (selection->start.type == SELECTION_BOUND_CENTER ||
1515       selection->start.type == SELECTION_BOUND_EMPTY) {
1516     selection->end = selection->start;
1517   } else {
1518     selection->end = ComputeViewportSelectionBound(
1519         selection_.end,
1520         selection_.end.layer_id ? LayerById(selection_.end.layer_id) : NULL,
1521         device_scale_factor());
1522   }
1523 }
1524
1525 void LayerTreeImpl::InputScrollAnimationFinished() {
1526   layer_tree_host_impl_->ScrollEnd();
1527 }
1528
1529 bool LayerTreeImpl::SmoothnessTakesPriority() const {
1530   return layer_tree_host_impl_->GetTreePriority() == SMOOTHNESS_TAKES_PRIORITY;
1531 }
1532
1533 BlockingTaskRunner* LayerTreeImpl::BlockingMainThreadTaskRunner() const {
1534   return proxy()->blocking_main_thread_task_runner();
1535 }
1536
1537 VideoFrameControllerClient* LayerTreeImpl::GetVideoFrameControllerClient()
1538     const {
1539   return layer_tree_host_impl_;
1540 }
1541
1542 void LayerTreeImpl::SetPendingPageScaleAnimation(
1543     scoped_ptr<PendingPageScaleAnimation> pending_animation) {
1544   pending_page_scale_animation_ = pending_animation.Pass();
1545 }
1546
1547 scoped_ptr<PendingPageScaleAnimation>
1548     LayerTreeImpl::TakePendingPageScaleAnimation() {
1549   return pending_page_scale_animation_.Pass();
1550 }
1551
1552 bool LayerTreeImpl::IsAnimatingFilterProperty(const LayerImpl* layer) const {
1553   LayerTreeType tree_type =
1554       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1555   return layer_tree_host_impl_->animation_host()
1556              ? layer_tree_host_impl_->animation_host()
1557                    ->IsAnimatingFilterProperty(layer->id(), tree_type)
1558              : false;
1559 }
1560
1561 bool LayerTreeImpl::IsAnimatingOpacityProperty(const LayerImpl* layer) const {
1562   LayerTreeType tree_type =
1563       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1564   return layer_tree_host_impl_->animation_host()
1565              ? layer_tree_host_impl_->animation_host()
1566                    ->IsAnimatingOpacityProperty(layer->id(), tree_type)
1567              : false;
1568 }
1569
1570 bool LayerTreeImpl::IsAnimatingTransformProperty(const LayerImpl* layer) const {
1571   LayerTreeType tree_type =
1572       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1573   return layer_tree_host_impl_->animation_host()
1574              ? layer_tree_host_impl_->animation_host()
1575                    ->IsAnimatingTransformProperty(layer->id(), tree_type)
1576              : false;
1577 }
1578
1579 bool LayerTreeImpl::HasPotentiallyRunningFilterAnimation(
1580     const LayerImpl* layer) const {
1581   LayerTreeType tree_type =
1582       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1583   return layer_tree_host_impl_->animation_host()
1584              ? layer_tree_host_impl_->animation_host()
1585                    ->HasPotentiallyRunningFilterAnimation(layer->id(),
1586                                                           tree_type)
1587              : false;
1588 }
1589
1590 bool LayerTreeImpl::HasPotentiallyRunningOpacityAnimation(
1591     const LayerImpl* layer) const {
1592   LayerTreeType tree_type =
1593       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1594   return layer_tree_host_impl_->animation_host()
1595              ? layer_tree_host_impl_->animation_host()
1596                    ->HasPotentiallyRunningOpacityAnimation(layer->id(),
1597                                                            tree_type)
1598              : false;
1599 }
1600
1601 bool LayerTreeImpl::HasPotentiallyRunningTransformAnimation(
1602     const LayerImpl* layer) const {
1603   LayerTreeType tree_type =
1604       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1605   return layer_tree_host_impl_->animation_host()
1606              ? layer_tree_host_impl_->animation_host()
1607                    ->HasPotentiallyRunningTransformAnimation(layer->id(),
1608                                                              tree_type)
1609              : false;
1610 }
1611
1612 bool LayerTreeImpl::HasAnyAnimationTargetingProperty(
1613     const LayerImpl* layer,
1614     Animation::TargetProperty property) const {
1615   return layer_tree_host_impl_->animation_host()
1616              ? layer_tree_host_impl_->animation_host()
1617                    ->HasAnyAnimationTargetingProperty(layer->id(), property)
1618              : false;
1619 }
1620
1621 bool LayerTreeImpl::FilterIsAnimatingOnImplOnly(const LayerImpl* layer) const {
1622   return layer_tree_host_impl_->animation_host()
1623              ? layer_tree_host_impl_->animation_host()
1624                    ->FilterIsAnimatingOnImplOnly(layer->id())
1625              : false;
1626 }
1627
1628 bool LayerTreeImpl::OpacityIsAnimatingOnImplOnly(const LayerImpl* layer) const {
1629   return layer_tree_host_impl_->animation_host()
1630              ? layer_tree_host_impl_->animation_host()
1631                    ->OpacityIsAnimatingOnImplOnly(layer->id())
1632              : false;
1633 }
1634
1635 bool LayerTreeImpl::TransformIsAnimatingOnImplOnly(
1636     const LayerImpl* layer) const {
1637   return layer_tree_host_impl_->animation_host()
1638              ? layer_tree_host_impl_->animation_host()
1639                    ->TransformIsAnimatingOnImplOnly(layer->id())
1640              : false;
1641 }
1642
1643 bool LayerTreeImpl::HasOnlyTranslationTransforms(const LayerImpl* layer) const {
1644   LayerTreeType tree_type =
1645       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1646   return layer_tree_host_impl_->animation_host()
1647              ? layer_tree_host_impl_->animation_host()
1648                    ->HasOnlyTranslationTransforms(layer->id(), tree_type)
1649              : true;
1650 }
1651
1652 bool LayerTreeImpl::MaximumTargetScale(const LayerImpl* layer,
1653                                        float* max_scale) const {
1654   *max_scale = 0.f;
1655   LayerTreeType tree_type =
1656       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1657   return layer_tree_host_impl_->animation_host()
1658              ? layer_tree_host_impl_->animation_host()->MaximumTargetScale(
1659                    layer->id(), tree_type, max_scale)
1660              : true;
1661 }
1662
1663 bool LayerTreeImpl::AnimationStartScale(const LayerImpl* layer,
1664                                         float* start_scale) const {
1665   *start_scale = 0.f;
1666   LayerTreeType tree_type =
1667       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1668   return layer_tree_host_impl_->animation_host()
1669              ? layer_tree_host_impl_->animation_host()->AnimationStartScale(
1670                    layer->id(), tree_type, start_scale)
1671              : true;
1672 }
1673
1674 bool LayerTreeImpl::HasFilterAnimationThatInflatesBounds(
1675     const LayerImpl* layer) const {
1676   return layer_tree_host_impl_->animation_host()
1677              ? layer_tree_host_impl_->animation_host()
1678                    ->HasFilterAnimationThatInflatesBounds(layer->id())
1679              : false;
1680 }
1681
1682 bool LayerTreeImpl::HasTransformAnimationThatInflatesBounds(
1683     const LayerImpl* layer) const {
1684   return layer_tree_host_impl_->animation_host()
1685              ? layer_tree_host_impl_->animation_host()
1686                    ->HasTransformAnimationThatInflatesBounds(layer->id())
1687              : false;
1688 }
1689
1690 bool LayerTreeImpl::HasAnimationThatInflatesBounds(
1691     const LayerImpl* layer) const {
1692   return layer_tree_host_impl_->animation_host()
1693              ? layer_tree_host_impl_->animation_host()
1694                    ->HasAnimationThatInflatesBounds(layer->id())
1695              : false;
1696 }
1697
1698 bool LayerTreeImpl::FilterAnimationBoundsForBox(const LayerImpl* layer,
1699                                                 const gfx::BoxF& box,
1700                                                 gfx::BoxF* bounds) const {
1701   return layer_tree_host_impl_->animation_host()
1702              ? layer_tree_host_impl_->animation_host()
1703                    ->FilterAnimationBoundsForBox(layer->id(), box, bounds)
1704              : false;
1705 }
1706
1707 bool LayerTreeImpl::TransformAnimationBoundsForBox(const LayerImpl* layer,
1708                                                    const gfx::BoxF& box,
1709                                                    gfx::BoxF* bounds) const {
1710   *bounds = gfx::BoxF();
1711   return layer_tree_host_impl_->animation_host()
1712              ? layer_tree_host_impl_->animation_host()
1713                    ->TransformAnimationBoundsForBox(layer->id(), box, bounds)
1714              : true;
1715 }
1716
1717 }  // namespace cc