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/layer_scroll_offset_delegate.h"
  23 #include "cc/input/page_scale_animation.h"
  24 #include "cc/layers/heads_up_display_layer_impl.h"
  25 #include "cc/layers/layer.h"
  26 #include "cc/layers/layer_iterator.h"
  27 #include "cc/layers/render_surface_impl.h"
  28 #include "cc/layers/scrollbar_layer_impl_base.h"
  29 #include "cc/resources/ui_resource_request.h"
  30 #include "cc/trees/layer_tree_host_common.h"
  31 #include "cc/trees/layer_tree_host_impl.h"
  32 #include "cc/trees/occlusion_tracker.h"
  33 #include "cc/trees/property_tree.h"
  34 #include "cc/trees/property_tree_builder.h"
  35 #include "ui/gfx/geometry/box_f.h"
  36 #include "ui/gfx/geometry/point_conversions.h"
  37 #include "ui/gfx/geometry/size_conversions.h"
  38 #include "ui/gfx/geometry/vector2d_conversions.h"
  39
  40 namespace cc {
  41
  42 LayerTreeImpl::LayerTreeImpl(
  43     LayerTreeHostImpl* layer_tree_host_impl,
  44     scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
  45     scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
  46     scoped_refptr<SyncedElasticOverscroll> elastic_overscroll)
  47     : layer_tree_host_impl_(layer_tree_host_impl),
  48       source_frame_number_(-1),
  49       hud_layer_(0),
  50       root_layer_scroll_offset_delegate_(NULL),
  51       background_color_(0),
  52       has_transparent_background_(false),
  53       currently_scrolling_layer_id_(Layer::INVALID_ID),
  54       overscroll_elasticity_layer_id_(Layer::INVALID_ID),
  55       page_scale_layer_id_(Layer::INVALID_ID),
  56       inner_viewport_scroll_layer_id_(Layer::INVALID_ID),
  57       outer_viewport_scroll_layer_id_(Layer::INVALID_ID),
  58       page_scale_factor_(page_scale_factor),
  59       min_page_scale_factor_(0),
  60       max_page_scale_factor_(0),
  61       hide_pinch_scrollbars_near_min_scale_(false),
  62       elastic_overscroll_(elastic_overscroll),
  63       viewport_size_invalid_(false),
  64       needs_update_draw_properties_(true),
  65       needs_full_tree_sync_(true),
  66       next_activation_forces_redraw_(false),
  67       has_ever_been_drawn_(false),
  68       render_surface_layer_list_id_(0),
  69       top_controls_shrink_blink_size_(false),
  70       top_controls_height_(0),
  71       top_controls_shown_ratio_(top_controls_shown_ratio) {
  72 }
  73
  74 LayerTreeImpl::~LayerTreeImpl() {
  75   BreakSwapPromises(IsActiveTree() ? SwapPromise::SWAP_FAILS
  76                                    : SwapPromise::ACTIVATION_FAILS);
  77
  78   // Need to explicitly clear the tree prior to destroying this so that
  79   // the LayerTreeImpl pointer is still valid in the LayerImpl dtor.
  80   DCHECK(!root_layer_);
  81   DCHECK(layers_with_copy_output_request_.empty());
  82 }
  83
  84 void LayerTreeImpl::Shutdown() {
  85   root_layer_ = nullptr;
  86 }
  87
  88 void LayerTreeImpl::ReleaseResources() {
  89   if (root_layer_) {
  90     LayerTreeHostCommon::CallFunctionForSubtree(
  91         root_layer_.get(), [](LayerImpl* layer) { layer->ReleaseResources(); });
  92   }
  93 }
  94
  95 void LayerTreeImpl::RecreateResources() {
  96   if (root_layer_) {
  97     LayerTreeHostCommon::CallFunctionForSubtree(
  98         root_layer_.get(),
  99         [](LayerImpl* layer) { layer->RecreateResources(); });
 100   }
 101 }
 102
 103 void LayerTreeImpl::GatherFrameTimingRequestIds(
 104     std::vector<int64_t>* request_ids) {
 105   if (!root_layer_)
 106     return;
 107
 108   // TODO(vmpstr): Early out if there are no requests on any of the layers. For
 109   // that, we need to inform LayerTreeImpl whenever there are requests when we
 110   // get them.
 111   LayerTreeHostCommon::CallFunctionForSubtree(
 112       root_layer_.get(), [request_ids](LayerImpl* layer) {
 113         layer->GatherFrameTimingRequestIds(request_ids);
 114       });
 115 }
 116
 117 void LayerTreeImpl::DidUpdateScrollOffset(int layer_id) {
 118   int inner_layer_id = InnerViewportScrollLayer()
 119                            ? InnerViewportScrollLayer()->id()
 120                            : Layer::INVALID_ID;
 121   int outer_layer_id = OuterViewportScrollLayer()
 122                            ? OuterViewportScrollLayer()->id()
 123                            : Layer::INVALID_ID;
 124   if (layer_id != outer_layer_id && layer_id != inner_layer_id)
 125     return;
 126
 127   if (!root_layer_scroll_offset_delegate_)
 128     return;
 129
 130   UpdateRootScrollOffsetDelegate();
 131 }
 132
 133 void LayerTreeImpl::SetRootLayer(scoped_ptr<LayerImpl> layer) {
 134   root_layer_ = layer.Pass();
 135
 136   layer_tree_host_impl_->OnCanDrawStateChangedForTree();
 137 }
 138
 139 LayerImpl* LayerTreeImpl::InnerViewportScrollLayer() const {
 140   return LayerById(inner_viewport_scroll_layer_id_);
 141 }
 142
 143 LayerImpl* LayerTreeImpl::OuterViewportScrollLayer() const {
 144   return LayerById(outer_viewport_scroll_layer_id_);
 145 }
 146
 147 gfx::ScrollOffset LayerTreeImpl::TotalScrollOffset() const {
 148   gfx::ScrollOffset offset;
 149
 150   if (InnerViewportScrollLayer())
 151     offset += InnerViewportScrollLayer()->CurrentScrollOffset();
 152
 153   if (OuterViewportScrollLayer())
 154     offset += OuterViewportScrollLayer()->CurrentScrollOffset();
 155
 156   return offset;
 157 }
 158
 159 gfx::ScrollOffset LayerTreeImpl::TotalMaxScrollOffset() const {
 160   gfx::ScrollOffset offset;
 161
 162   if (InnerViewportScrollLayer())
 163     offset += InnerViewportScrollLayer()->MaxScrollOffset();
 164
 165   if (OuterViewportScrollLayer())
 166     offset += OuterViewportScrollLayer()->MaxScrollOffset();
 167
 168   return offset;
 169 }
 170
 171 scoped_ptr<LayerImpl> LayerTreeImpl::DetachLayerTree() {
 172   render_surface_layer_list_.clear();
 173   set_needs_update_draw_properties();
 174   return root_layer_.Pass();
 175 }
 176
 177 static void UpdateClipTreeForBoundsDeltaOnLayer(LayerImpl* layer,
 178                                                 ClipTree* clip_tree) {
 179   if (layer && layer->masks_to_bounds()) {
 180     ClipNode* clip_node = clip_tree->Node(layer->clip_tree_index());
 181     if (clip_node) {
 182       DCHECK_EQ(layer->id(), clip_node->owner_id);
 183       gfx::Size bounds = layer->bounds();
 184       if (clip_node->data.clip.size() != bounds) {
 185         clip_node->data.clip.set_size(bounds);
 186         clip_tree->set_needs_update(true);
 187       }
 188     }
 189   }
 190 }
 191
 192 void LayerTreeImpl::UpdatePropertyTreesForBoundsDelta() {
 193   DCHECK(IsActiveTree());
 194   LayerImpl* inner_container = InnerViewportContainerLayer();
 195   LayerImpl* outer_container = OuterViewportContainerLayer();
 196
 197   UpdateClipTreeForBoundsDeltaOnLayer(inner_container,
 198                                       &property_trees_.clip_tree);
 199   UpdateClipTreeForBoundsDeltaOnLayer(InnerViewportScrollLayer(),
 200                                       &property_trees_.clip_tree);
 201   UpdateClipTreeForBoundsDeltaOnLayer(outer_container,
 202                                       &property_trees_.clip_tree);
 203
 204   TransformTree& transform_tree = property_trees_.transform_tree;
 205   if (inner_container)
 206     transform_tree.SetInnerViewportBoundsDelta(inner_container->bounds_delta());
 207   if (outer_container)
 208     transform_tree.SetOuterViewportBoundsDelta(outer_container->bounds_delta());
 209 }
 210
 211 void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {
 212   // The request queue should have been processed and does not require a push.
 213   DCHECK_EQ(ui_resource_request_queue_.size(), 0u);
 214
 215   target_tree->SetPropertyTrees(property_trees_);
 216
 217   if (next_activation_forces_redraw_) {
 218     target_tree->ForceRedrawNextActivation();
 219     next_activation_forces_redraw_ = false;
 220   }
 221
 222   target_tree->PassSwapPromises(&swap_promise_list_);
 223
 224   target_tree->set_top_controls_shrink_blink_size(
 225       top_controls_shrink_blink_size_);
 226   target_tree->set_top_controls_height(top_controls_height_);
 227   target_tree->PushTopControls(nullptr);
 228
 229   target_tree->set_hide_pinch_scrollbars_near_min_scale(
 230       hide_pinch_scrollbars_near_min_scale_);
 231
 232   // Active tree already shares the page_scale_factor object with pending
 233   // tree so only the limits need to be provided.
 234   target_tree->PushPageScaleFactorAndLimits(nullptr, min_page_scale_factor(),
 235                                             max_page_scale_factor());
 236   target_tree->elastic_overscroll()->PushPendingToActive();
 237
 238   target_tree->pending_page_scale_animation_ =
 239       pending_page_scale_animation_.Pass();
 240
 241   target_tree->SetViewportLayersFromIds(
 242       overscroll_elasticity_layer_id_, page_scale_layer_id_,
 243       inner_viewport_scroll_layer_id_, outer_viewport_scroll_layer_id_);
 244
 245   target_tree->RegisterSelection(selection_);
 246
 247   // This should match the property synchronization in
 248   // LayerTreeHost::finishCommitOnImplThread().
 249   target_tree->set_source_frame_number(source_frame_number());
 250   target_tree->set_background_color(background_color());
 251   target_tree->set_has_transparent_background(has_transparent_background());
 252
 253   if (ViewportSizeInvalid())
 254     target_tree->SetViewportSizeInvalid();
 255   else
 256     target_tree->ResetViewportSizeInvalid();
 257
 258   if (hud_layer())
 259     target_tree->set_hud_layer(static_cast<HeadsUpDisplayLayerImpl*>(
 260         LayerTreeHostCommon::FindLayerInSubtree(
 261             target_tree->root_layer(), hud_layer()->id())));
 262   else
 263     target_tree->set_hud_layer(NULL);
 264
 265   target_tree->has_ever_been_drawn_ = false;
 266 }
 267
 268 LayerImpl* LayerTreeImpl::InnerViewportContainerLayer() const {
 269   return InnerViewportScrollLayer()
 270              ? InnerViewportScrollLayer()->scroll_clip_layer()
 271              : NULL;
 272 }
 273
 274 LayerImpl* LayerTreeImpl::OuterViewportContainerLayer() const {
 275   return OuterViewportScrollLayer()
 276              ? OuterViewportScrollLayer()->scroll_clip_layer()
 277              : NULL;
 278 }
 279
 280 LayerImpl* LayerTreeImpl::CurrentlyScrollingLayer() const {
 281   DCHECK(IsActiveTree());
 282   return LayerById(currently_scrolling_layer_id_);
 283 }
 284
 285 void LayerTreeImpl::SetCurrentlyScrollingLayer(LayerImpl* layer) {
 286   int new_id = layer ? layer->id() : Layer::INVALID_ID;
 287   if (currently_scrolling_layer_id_ == new_id)
 288     return;
 289
 290   if (CurrentlyScrollingLayer() &&
 291       CurrentlyScrollingLayer()->scrollbar_animation_controller())
 292     CurrentlyScrollingLayer()->scrollbar_animation_controller()->DidScrollEnd();
 293   currently_scrolling_layer_id_ = new_id;
 294   if (layer && layer->scrollbar_animation_controller())
 295     layer->scrollbar_animation_controller()->DidScrollBegin();
 296 }
 297
 298 void LayerTreeImpl::ClearCurrentlyScrollingLayer() {
 299   SetCurrentlyScrollingLayer(NULL);
 300 }
 301
 302 namespace {
 303
 304 void ForceScrollbarParameterUpdateAfterScaleChange(LayerImpl* current_layer) {
 305   if (!current_layer)
 306     return;
 307
 308   while (current_layer) {
 309     current_layer->ScrollbarParametersDidChange(false);
 310     current_layer = current_layer->parent();
 311   }
 312 }
 313
 314 }  // namespace
 315
 316 float LayerTreeImpl::ClampPageScaleFactorToLimits(
 317     float page_scale_factor) const {
 318   if (min_page_scale_factor_ && page_scale_factor < min_page_scale_factor_)
 319     page_scale_factor = min_page_scale_factor_;
 320   else if (max_page_scale_factor_ && page_scale_factor > max_page_scale_factor_)
 321     page_scale_factor = max_page_scale_factor_;
 322   return page_scale_factor;
 323 }
 324
 325 void LayerTreeImpl::UpdatePropertyTreeScrollingAndAnimationFromMainThread() {
 326   // TODO(enne): This should get replaced by pulling out scrolling and
 327   // animations into their own trees.  Then scrolls and animations would have
 328   // their own ways of synchronizing across commits.  This occurs to push
 329   // updates from scrolling deltas on the compositor thread that have occurred
 330   // after begin frame and updates from animations that have ticked since begin
 331   // frame to a newly-committed property tree.
 332   if (!root_layer())
 333     return;
 334   LayerTreeHostCommon::CallFunctionForSubtree(
 335       root_layer(), [](LayerImpl* layer) {
 336         layer->UpdatePropertyTreeForScrollingAndAnimationIfNeeded();
 337       });
 338 }
 339
 340 void LayerTreeImpl::SetPageScaleOnActiveTree(float active_page_scale) {
 341   DCHECK(IsActiveTree());
 342   if (page_scale_factor()->SetCurrent(
 343           ClampPageScaleFactorToLimits(active_page_scale)))
 344     DidUpdatePageScale();
 345 }
 346
 347 void LayerTreeImpl::PushPageScaleFromMainThread(float page_scale_factor,
 348                                                 float min_page_scale_factor,
 349                                                 float max_page_scale_factor) {
 350   PushPageScaleFactorAndLimits(&page_scale_factor, min_page_scale_factor,
 351                                max_page_scale_factor);
 352 }
 353
 354 void LayerTreeImpl::PushPageScaleFactorAndLimits(const float* page_scale_factor,
 355                                                  float min_page_scale_factor,
 356                                                  float max_page_scale_factor) {
 357   DCHECK(page_scale_factor || IsActiveTree());
 358   bool changed_page_scale = false;
 359   if (page_scale_factor) {
 360     DCHECK(!IsActiveTree() || !layer_tree_host_impl_->pending_tree());
 361     changed_page_scale |= page_scale_factor_->Delta() != 1.f;
 362     // TODO(enne): Once CDP goes away, ignore this call below.  The only time
 363     // the property trees will differ is if there's been a page scale on the
 364     // compositor thread after the begin frame, which is the delta check above.
 365     changed_page_scale |=
 366         page_scale_factor_->PushFromMainThread(*page_scale_factor);
 367   }
 368   if (IsActiveTree()) {
 369     // TODO(enne): Pushing from pending to active should never require
 370     // DidUpdatePageScale.  The values should already be set by the fully
 371     // computed property trees being synced from one tree to another.  Remove
 372     // this once CDP goes away.
 373     changed_page_scale |= page_scale_factor_->PushPendingToActive();
 374   }
 375
 376   changed_page_scale |=
 377       SetPageScaleFactorLimits(min_page_scale_factor, max_page_scale_factor);
 378
 379   if (changed_page_scale)
 380     DidUpdatePageScale();
 381 }
 382
 383 void LayerTreeImpl::set_top_controls_shrink_blink_size(bool shrink) {
 384   if (top_controls_shrink_blink_size_ == shrink)
 385     return;
 386
 387   top_controls_shrink_blink_size_ = shrink;
 388   if (IsActiveTree())
 389     layer_tree_host_impl_->UpdateViewportContainerSizes();
 390 }
 391
 392 void LayerTreeImpl::set_top_controls_height(float top_controls_height) {
 393   if (top_controls_height_ == top_controls_height)
 394     return;
 395
 396   top_controls_height_ = top_controls_height;
 397   if (IsActiveTree())
 398     layer_tree_host_impl_->UpdateViewportContainerSizes();
 399 }
 400
 401 bool LayerTreeImpl::SetCurrentTopControlsShownRatio(float ratio) {
 402   ratio = std::max(ratio, 0.f);
 403   ratio = std::min(ratio, 1.f);
 404   return top_controls_shown_ratio_->SetCurrent(ratio);
 405 }
 406
 407 void LayerTreeImpl::PushTopControlsFromMainThread(
 408     float top_controls_shown_ratio) {
 409   PushTopControls(&top_controls_shown_ratio);
 410 }
 411
 412 void LayerTreeImpl::PushTopControls(const float* top_controls_shown_ratio) {
 413   DCHECK(top_controls_shown_ratio || IsActiveTree());
 414
 415   if (top_controls_shown_ratio) {
 416     DCHECK(!IsActiveTree() || !layer_tree_host_impl_->pending_tree());
 417     top_controls_shown_ratio_->PushFromMainThread(*top_controls_shown_ratio);
 418   }
 419   if (IsActiveTree()) {
 420     if (top_controls_shown_ratio_->PushPendingToActive())
 421       layer_tree_host_impl_->DidChangeTopControlsPosition();
 422   }
 423 }
 424
 425 bool LayerTreeImpl::SetPageScaleFactorLimits(float min_page_scale_factor,
 426                                              float max_page_scale_factor) {
 427   if (min_page_scale_factor == min_page_scale_factor_ &&
 428       max_page_scale_factor == max_page_scale_factor_)
 429     return false;
 430
 431   min_page_scale_factor_ = min_page_scale_factor;
 432   max_page_scale_factor_ = max_page_scale_factor;
 433
 434   return true;
 435 }
 436
 437 void LayerTreeImpl::DidUpdatePageScale() {
 438   if (IsActiveTree())
 439     page_scale_factor()->SetCurrent(
 440         ClampPageScaleFactorToLimits(current_page_scale_factor()));
 441
 442   set_needs_update_draw_properties();
 443
 444   if (root_layer_scroll_offset_delegate_) {
 445     root_layer_scroll_offset_delegate_->UpdateRootLayerState(
 446         TotalScrollOffset(), TotalMaxScrollOffset(), ScrollableSize(),
 447         current_page_scale_factor(), min_page_scale_factor_,
 448         max_page_scale_factor_);
 449   }
 450
 451   if (PageScaleLayer() && PageScaleLayer()->transform_tree_index() != -1) {
 452     TransformNode* node = property_trees_.transform_tree.Node(
 453         PageScaleLayer()->transform_tree_index());
 454     node->data.post_local_scale_factor = current_page_scale_factor();
 455     node->data.needs_local_transform_update = true;
 456     // TODO(enne): property trees can't ask the layer these things, but
 457     // the page scale layer should *just* be the page scale.
 458     DCHECK_EQ(PageScaleLayer()->position().ToString(),
 459               gfx::PointF().ToString());
 460     DCHECK_EQ(PageScaleLayer()->transform_origin().ToString(),
 461               gfx::Point3F().ToString());
 462     node->data.update_post_local_transform(gfx::PointF(), gfx::Point3F());
 463     property_trees_.transform_tree.set_needs_update(true);
 464   }
 465
 466   ForceScrollbarParameterUpdateAfterScaleChange(PageScaleLayer());
 467   HideInnerViewportScrollbarsIfNeeded();
 468 }
 469
 470 void LayerTreeImpl::HideInnerViewportScrollbarsIfNeeded() {
 471   if (!InnerViewportContainerLayer())
 472     return;
 473
 474   LayerImpl::ScrollbarSet* scrollbars =
 475       InnerViewportContainerLayer()->scrollbars();
 476
 477   if (!scrollbars)
 478     return;
 479
 480   float minimum_scale_to_show_at = min_page_scale_factor() * 1.05f;
 481   bool hide_scrollbars =
 482       hide_pinch_scrollbars_near_min_scale_ &&
 483       (current_page_scale_factor() < minimum_scale_to_show_at);
 484
 485   for (LayerImpl::ScrollbarSet::iterator it = scrollbars->begin();
 486        it != scrollbars->end(); ++it)
 487     (*it)->SetHideLayerAndSubtree(hide_scrollbars);
 488 }
 489
 490 SyncedProperty<ScaleGroup>* LayerTreeImpl::page_scale_factor() {
 491   return page_scale_factor_.get();
 492 }
 493
 494 const SyncedProperty<ScaleGroup>* LayerTreeImpl::page_scale_factor() const {
 495   return page_scale_factor_.get();
 496 }
 497
 498 gfx::SizeF LayerTreeImpl::ScrollableViewportSize() const {
 499   if (!InnerViewportContainerLayer())
 500     return gfx::SizeF();
 501
 502   return gfx::ScaleSize(InnerViewportContainerLayer()->BoundsForScrolling(),
 503                         1.0f / current_page_scale_factor());
 504 }
 505
 506 gfx::Rect LayerTreeImpl::RootScrollLayerDeviceViewportBounds() const {
 507   LayerImpl* root_scroll_layer = OuterViewportScrollLayer()
 508                                      ? OuterViewportScrollLayer()
 509                                      : InnerViewportScrollLayer();
 510   if (!root_scroll_layer || root_scroll_layer->children().empty())
 511     return gfx::Rect();
 512   LayerImpl* layer = root_scroll_layer->children()[0];
 513   return MathUtil::MapEnclosingClippedRect(layer->screen_space_transform(),
 514                                            gfx::Rect(layer->bounds()));
 515 }
 516
 517 void LayerTreeImpl::ApplySentScrollAndScaleDeltasFromAbortedCommit() {
 518   DCHECK(IsActiveTree());
 519
 520   page_scale_factor()->AbortCommit();
 521   top_controls_shown_ratio()->AbortCommit();
 522   elastic_overscroll()->AbortCommit();
 523
 524   if (!root_layer())
 525     return;
 526
 527   LayerTreeHostCommon::CallFunctionForSubtree(
 528       root_layer(), [](LayerImpl* layer) {
 529         layer->ApplySentScrollDeltasFromAbortedCommit();
 530       });
 531 }
 532
 533 void LayerTreeImpl::SetViewportLayersFromIds(
 534     int overscroll_elasticity_layer_id,
 535     int page_scale_layer_id,
 536     int inner_viewport_scroll_layer_id,
 537     int outer_viewport_scroll_layer_id) {
 538   overscroll_elasticity_layer_id_ = overscroll_elasticity_layer_id;
 539   page_scale_layer_id_ = page_scale_layer_id;
 540   inner_viewport_scroll_layer_id_ = inner_viewport_scroll_layer_id;
 541   outer_viewport_scroll_layer_id_ = outer_viewport_scroll_layer_id;
 542
 543   HideInnerViewportScrollbarsIfNeeded();
 544 }
 545
 546 void LayerTreeImpl::ClearViewportLayers() {
 547   overscroll_elasticity_layer_id_ = Layer::INVALID_ID;
 548   page_scale_layer_id_ = Layer::INVALID_ID;
 549   inner_viewport_scroll_layer_id_ = Layer::INVALID_ID;
 550   outer_viewport_scroll_layer_id_ = Layer::INVALID_ID;
 551 }
 552
 553 bool LayerTreeImpl::UpdateDrawProperties(bool update_lcd_text) {
 554   if (!needs_update_draw_properties_)
 555     return true;
 556
 557   // Calling UpdateDrawProperties must clear this flag, so there can be no
 558   // early outs before this.
 559   needs_update_draw_properties_ = false;
 560
 561   // For max_texture_size.  When the renderer is re-created in
 562   // CreateAndSetRenderer, the needs update draw properties flag is set
 563   // again.
 564   if (!layer_tree_host_impl_->renderer())
 565     return false;
 566
 567   // Clear this after the renderer early out, as it should still be
 568   // possible to hit test even without a renderer.
 569   render_surface_layer_list_.clear();
 570
 571   if (!root_layer())
 572     return false;
 573
 574   {
 575     TRACE_EVENT2(
 576         "cc", "LayerTreeImpl::UpdateDrawProperties::CalculateDrawProperties",
 577         "IsActive", IsActiveTree(), "SourceFrameNumber", source_frame_number_);
 578     bool can_render_to_separate_surface =
 579         (layer_tree_host_impl_->GetDrawMode() !=
 580          DRAW_MODE_RESOURCELESS_SOFTWARE);
 581
 582     ++render_surface_layer_list_id_;
 583
 584     LayerTreeHostCommon::CalcDrawPropsImplInputs inputs(
 585         root_layer(), DrawViewportSize(),
 586         layer_tree_host_impl_->DrawTransform(), device_scale_factor(),
 587         current_page_scale_factor(), PageScaleLayer(),
 588         InnerViewportScrollLayer(), OuterViewportScrollLayer(),
 589         elastic_overscroll()->Current(IsActiveTree()),
 590         OverscrollElasticityLayer(), resource_provider()->max_texture_size(),
 591         settings().can_use_lcd_text, settings().layers_always_allowed_lcd_text,
 592         can_render_to_separate_surface,
 593         settings().layer_transforms_should_scale_layer_contents,
 594         settings().verify_property_trees, &render_surface_layer_list_,
 595         render_surface_layer_list_id_, &property_trees_);
 596     LayerTreeHostCommon::CalculateDrawProperties(&inputs);
 597   }
 598
 599   {
 600     TRACE_EVENT2("cc", "LayerTreeImpl::UpdateDrawProperties::Occlusion",
 601                  "IsActive", IsActiveTree(), "SourceFrameNumber",
 602                  source_frame_number_);
 603     OcclusionTracker occlusion_tracker(
 604         root_layer()->render_surface()->content_rect());
 605     occlusion_tracker.set_minimum_tracking_size(
 606         settings().minimum_occlusion_tracking_size);
 607
 608     // LayerIterator is used here instead of CallFunctionForSubtree to only
 609     // UpdateTilePriorities on layers that will be visible (and thus have valid
 610     // draw properties) and not because any ordering is required.
 611     LayerIterator end = LayerIterator::End(&render_surface_layer_list_);
 612     for (LayerIterator it = LayerIterator::Begin(&render_surface_layer_list_);
 613          it != end; ++it) {
 614       occlusion_tracker.EnterLayer(it);
 615
 616       // There are very few render targets so this should be cheap to do for
 617       // each layer instead of something more complicated.
 618       bool inside_replica = false;
 619       LayerImpl* layer = it->render_target();
 620       while (layer && !inside_replica) {
 621         if (layer->render_target()->has_replica())
 622           inside_replica = true;
 623         layer = layer->render_target()->parent();
 624       }
 625
 626       // Don't use occlusion if a layer will appear in a replica, since the
 627       // tile raster code does not know how to look for the replica and would
 628       // consider it occluded even though the replica is visible.
 629       // Since occlusion is only used for browser compositor (i.e.
 630       // use_occlusion_for_tile_prioritization) and it won't use replicas,
 631       // this should matter not.
 632
 633       if (it.represents_itself()) {
 634         Occlusion occlusion =
 635             inside_replica ? Occlusion()
 636                            : occlusion_tracker.GetCurrentOcclusionForLayer(
 637                                  it->draw_transform());
 638         it->draw_properties().occlusion_in_content_space = occlusion;
 639       }
 640
 641       if (it.represents_contributing_render_surface()) {
 642         // Surfaces aren't used by the tile raster code, so they can have
 643         // occlusion regardless of replicas.
 644         Occlusion occlusion =
 645             occlusion_tracker.GetCurrentOcclusionForContributingSurface(
 646                 it->render_surface()->draw_transform());
 647         it->render_surface()->set_occlusion_in_content_space(occlusion);
 648         // Masks are used to draw the contributing surface, so should have
 649         // the same occlusion as the surface (nothing inside the surface
 650         // occludes them).
 651         if (LayerImpl* mask = it->mask_layer()) {
 652           Occlusion mask_occlusion =
 653               inside_replica
 654                   ? Occlusion()
 655                   : occlusion_tracker.GetCurrentOcclusionForContributingSurface(
 656                         it->render_surface()->draw_transform() *
 657                         it->draw_transform());
 658           mask->draw_properties().occlusion_in_content_space = mask_occlusion;
 659         }
 660         if (LayerImpl* replica = it->replica_layer()) {
 661           if (LayerImpl* mask = replica->mask_layer())
 662             mask->draw_properties().occlusion_in_content_space = Occlusion();
 663         }
 664       }
 665
 666       occlusion_tracker.LeaveLayer(it);
 667     }
 668
 669     unoccluded_screen_space_region_ =
 670         occlusion_tracker.ComputeVisibleRegionInScreen();
 671   }
 672
 673   // It'd be ideal if this could be done earlier, but when the raster source
 674   // is updated from the main thread during push properties, update draw
 675   // properties has not occurred yet and so it's not clear whether or not the
 676   // layer can or cannot use lcd text.  So, this is the cleanup pass to
 677   // determine if the raster source needs to be replaced with a non-lcd
 678   // raster source due to draw properties.
 679   if (update_lcd_text) {
 680     // TODO(enne): Make LTHI::sync_tree return this value.
 681     LayerTreeImpl* sync_tree =
 682         layer_tree_host_impl_->proxy()->CommitToActiveTree()
 683             ? layer_tree_host_impl_->active_tree()
 684             : layer_tree_host_impl_->pending_tree();
 685     // If this is not the sync tree, then it is not safe to update lcd text
 686     // as it causes invalidations and the tiles may be in use.
 687     DCHECK_EQ(this, sync_tree);
 688     for (const auto& layer : picture_layers_)
 689       layer->UpdateCanUseLCDTextAfterCommit();
 690   }
 691
 692   {
 693     TRACE_EVENT_BEGIN2("cc", "LayerTreeImpl::UpdateDrawProperties::UpdateTiles",
 694                        "IsActive", IsActiveTree(), "SourceFrameNumber",
 695                        source_frame_number_);
 696     const bool resourceless_software_draw =
 697         (layer_tree_host_impl_->GetDrawMode() ==
 698          DRAW_MODE_RESOURCELESS_SOFTWARE);
 699     size_t layers_updated_count = 0;
 700     bool tile_priorities_updated = false;
 701     for (PictureLayerImpl* layer : picture_layers_) {
 702       if (!layer->IsDrawnRenderSurfaceLayerListMember())
 703         continue;
 704       ++layers_updated_count;
 705       tile_priorities_updated |= layer->UpdateTiles(resourceless_software_draw);
 706     }
 707
 708     if (tile_priorities_updated)
 709       DidModifyTilePriorities();
 710
 711     TRACE_EVENT_END1("cc", "LayerTreeImpl::UpdateTilePriorities",
 712                      "layers_updated_count", layers_updated_count);
 713   }
 714
 715   DCHECK(!needs_update_draw_properties_) <<
 716       "CalcDrawProperties should not set_needs_update_draw_properties()";
 717   return true;
 718 }
 719
 720 void LayerTreeImpl::BuildPropertyTreesForTesting() {
 721   LayerTreeHostCommon::PreCalculateMetaInformationForTesting(root_layer_.get());
 722   PropertyTreeBuilder::BuildPropertyTrees(
 723       root_layer_.get(), PageScaleLayer(), InnerViewportScrollLayer(),
 724       OuterViewportScrollLayer(), current_page_scale_factor(),
 725       device_scale_factor(), gfx::Rect(DrawViewportSize()),
 726       layer_tree_host_impl_->DrawTransform(), &property_trees_);
 727 }
 728
 729 const LayerImplList& LayerTreeImpl::RenderSurfaceLayerList() const {
 730   // If this assert triggers, then the list is dirty.
 731   DCHECK(!needs_update_draw_properties_);
 732   return render_surface_layer_list_;
 733 }
 734
 735 const Region& LayerTreeImpl::UnoccludedScreenSpaceRegion() const {
 736   // If this assert triggers, then the render_surface_layer_list_ is dirty, so
 737   // the unoccluded_screen_space_region_ is not valid anymore.
 738   DCHECK(!needs_update_draw_properties_);
 739   return unoccluded_screen_space_region_;
 740 }
 741
 742 gfx::SizeF LayerTreeImpl::ScrollableSize() const {
 743   LayerImpl* root_scroll_layer = OuterViewportScrollLayer()
 744                                      ? OuterViewportScrollLayer()
 745                                      : InnerViewportScrollLayer();
 746   if (!root_scroll_layer || root_scroll_layer->children().empty())
 747     return gfx::Size();
 748
 749   gfx::SizeF content_size =
 750       root_scroll_layer->children()[0]->BoundsForScrolling();
 751   gfx::SizeF viewport_size =
 752       root_scroll_layer->scroll_clip_layer()->BoundsForScrolling();
 753
 754   content_size.SetToMax(viewport_size);
 755   return content_size;
 756 }
 757
 758 LayerImpl* LayerTreeImpl::LayerById(int id) const {
 759   LayerIdMap::const_iterator iter = layer_id_map_.find(id);
 760   return iter != layer_id_map_.end() ? iter->second : NULL;
 761 }
 762
 763 void LayerTreeImpl::RegisterLayer(LayerImpl* layer) {
 764   DCHECK(!LayerById(layer->id()));
 765   layer_id_map_[layer->id()] = layer;
 766   if (layer_tree_host_impl_->animation_host())
 767     layer_tree_host_impl_->animation_host()->RegisterLayer(
 768         layer->id(),
 769         IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING);
 770 }
 771
 772 void LayerTreeImpl::UnregisterLayer(LayerImpl* layer) {
 773   DCHECK(LayerById(layer->id()));
 774   if (layer_tree_host_impl_->animation_host())
 775     layer_tree_host_impl_->animation_host()->UnregisterLayer(
 776         layer->id(),
 777         IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING);
 778   layer_id_map_.erase(layer->id());
 779 }
 780
 781 size_t LayerTreeImpl::NumLayers() {
 782   return layer_id_map_.size();
 783 }
 784
 785 void LayerTreeImpl::DidBecomeActive() {
 786   if (next_activation_forces_redraw_) {
 787     layer_tree_host_impl_->SetFullRootLayerDamage();
 788     next_activation_forces_redraw_ = false;
 789   }
 790
 791   // Always reset this flag on activation, as we would only have activated
 792   // if we were in a good state.
 793   layer_tree_host_impl_->ResetRequiresHighResToDraw();
 794
 795   if (root_layer()) {
 796     LayerTreeHostCommon::CallFunctionForSubtree(
 797         root_layer(), [](LayerImpl* layer) { layer->DidBecomeActive(); });
 798   }
 799
 800   for (auto* swap_promise : swap_promise_list_)
 801     swap_promise->DidActivate();
 802   devtools_instrumentation::DidActivateLayerTree(layer_tree_host_impl_->id(),
 803                                                  source_frame_number_);
 804 }
 805
 806 bool LayerTreeImpl::RequiresHighResToDraw() const {
 807   return layer_tree_host_impl_->RequiresHighResToDraw();
 808 }
 809
 810 bool LayerTreeImpl::ViewportSizeInvalid() const {
 811   return viewport_size_invalid_;
 812 }
 813
 814 void LayerTreeImpl::SetViewportSizeInvalid() {
 815   viewport_size_invalid_ = true;
 816   layer_tree_host_impl_->OnCanDrawStateChangedForTree();
 817 }
 818
 819 void LayerTreeImpl::ResetViewportSizeInvalid() {
 820   viewport_size_invalid_ = false;
 821   layer_tree_host_impl_->OnCanDrawStateChangedForTree();
 822 }
 823
 824 Proxy* LayerTreeImpl::proxy() const {
 825   return layer_tree_host_impl_->proxy();
 826 }
 827
 828 const LayerTreeSettings& LayerTreeImpl::settings() const {
 829   return layer_tree_host_impl_->settings();
 830 }
 831
 832 const LayerTreeDebugState& LayerTreeImpl::debug_state() const {
 833   return layer_tree_host_impl_->debug_state();
 834 }
 835
 836 const RendererCapabilitiesImpl& LayerTreeImpl::GetRendererCapabilities() const {
 837   return layer_tree_host_impl_->GetRendererCapabilities();
 838 }
 839
 840 ContextProvider* LayerTreeImpl::context_provider() const {
 841   return output_surface()->context_provider();
 842 }
 843
 844 OutputSurface* LayerTreeImpl::output_surface() const {
 845   return layer_tree_host_impl_->output_surface();
 846 }
 847
 848 ResourceProvider* LayerTreeImpl::resource_provider() const {
 849   return layer_tree_host_impl_->resource_provider();
 850 }
 851
 852 TileManager* LayerTreeImpl::tile_manager() const {
 853   return layer_tree_host_impl_->tile_manager();
 854 }
 855
 856 FrameRateCounter* LayerTreeImpl::frame_rate_counter() const {
 857   return layer_tree_host_impl_->fps_counter();
 858 }
 859
 860 PaintTimeCounter* LayerTreeImpl::paint_time_counter() const {
 861   return layer_tree_host_impl_->paint_time_counter();
 862 }
 863
 864 MemoryHistory* LayerTreeImpl::memory_history() const {
 865   return layer_tree_host_impl_->memory_history();
 866 }
 867
 868 gfx::Size LayerTreeImpl::device_viewport_size() const {
 869   return layer_tree_host_impl_->device_viewport_size();
 870 }
 871
 872 float LayerTreeImpl::device_scale_factor() const {
 873   return layer_tree_host_impl_->device_scale_factor();
 874 }
 875
 876 DebugRectHistory* LayerTreeImpl::debug_rect_history() const {
 877   return layer_tree_host_impl_->debug_rect_history();
 878 }
 879
 880 bool LayerTreeImpl::IsActiveTree() const {
 881   return layer_tree_host_impl_->active_tree() == this;
 882 }
 883
 884 bool LayerTreeImpl::IsPendingTree() const {
 885   return layer_tree_host_impl_->pending_tree() == this;
 886 }
 887
 888 bool LayerTreeImpl::IsRecycleTree() const {
 889   return layer_tree_host_impl_->recycle_tree() == this;
 890 }
 891
 892 bool LayerTreeImpl::IsSyncTree() const {
 893   return layer_tree_host_impl_->sync_tree() == this;
 894 }
 895
 896 LayerImpl* LayerTreeImpl::FindActiveTreeLayerById(int id) {
 897   LayerTreeImpl* tree = layer_tree_host_impl_->active_tree();
 898   if (!tree)
 899     return NULL;
 900   return tree->LayerById(id);
 901 }
 902
 903 LayerImpl* LayerTreeImpl::FindPendingTreeLayerById(int id) {
 904   LayerTreeImpl* tree = layer_tree_host_impl_->pending_tree();
 905   if (!tree)
 906     return NULL;
 907   return tree->LayerById(id);
 908 }
 909
 910 bool LayerTreeImpl::PinchGestureActive() const {
 911   return layer_tree_host_impl_->pinch_gesture_active();
 912 }
 913
 914 BeginFrameArgs LayerTreeImpl::CurrentBeginFrameArgs() const {
 915   return layer_tree_host_impl_->CurrentBeginFrameArgs();
 916 }
 917
 918 base::TimeDelta LayerTreeImpl::CurrentBeginFrameInterval() const {
 919   return layer_tree_host_impl_->CurrentBeginFrameInterval();
 920 }
 921
 922 void LayerTreeImpl::SetNeedsCommit() {
 923   layer_tree_host_impl_->SetNeedsCommit();
 924 }
 925
 926 gfx::Rect LayerTreeImpl::DeviceViewport() const {
 927   return layer_tree_host_impl_->DeviceViewport();
 928 }
 929
 930 gfx::Size LayerTreeImpl::DrawViewportSize() const {
 931   return layer_tree_host_impl_->DrawViewportSize();
 932 }
 933
 934 const gfx::Rect LayerTreeImpl::ViewportRectForTilePriority() const {
 935   return layer_tree_host_impl_->ViewportRectForTilePriority();
 936 }
 937
 938 scoped_ptr<ScrollbarAnimationController>
 939 LayerTreeImpl::CreateScrollbarAnimationController(LayerImpl* scrolling_layer) {
 940   DCHECK(settings().scrollbar_fade_delay_ms);
 941   DCHECK(settings().scrollbar_fade_duration_ms);
 942   base::TimeDelta delay =
 943       base::TimeDelta::FromMilliseconds(settings().scrollbar_fade_delay_ms);
 944   base::TimeDelta resize_delay = base::TimeDelta::FromMilliseconds(
 945       settings().scrollbar_fade_resize_delay_ms);
 946   base::TimeDelta duration =
 947       base::TimeDelta::FromMilliseconds(settings().scrollbar_fade_duration_ms);
 948   switch (settings().scrollbar_animator) {
 949     case LayerTreeSettings::LINEAR_FADE: {
 950       return ScrollbarAnimationControllerLinearFade::Create(
 951           scrolling_layer,
 952           layer_tree_host_impl_,
 953           delay,
 954           resize_delay,
 955           duration);
 956     }
 957     case LayerTreeSettings::THINNING: {
 958       return ScrollbarAnimationControllerThinning::Create(scrolling_layer,
 959                                                           layer_tree_host_impl_,
 960                                                           delay,
 961                                                           resize_delay,
 962                                                           duration);
 963     }
 964     case LayerTreeSettings::NO_ANIMATOR:
 965       NOTREACHED();
 966       break;
 967   }
 968   return nullptr;
 969 }
 970
 971 void LayerTreeImpl::DidAnimateScrollOffset() {
 972   layer_tree_host_impl_->DidAnimateScrollOffset();
 973 }
 974
 975 bool LayerTreeImpl::use_gpu_rasterization() const {
 976   return layer_tree_host_impl_->use_gpu_rasterization();
 977 }
 978
 979 GpuRasterizationStatus LayerTreeImpl::GetGpuRasterizationStatus() const {
 980   return layer_tree_host_impl_->gpu_rasterization_status();
 981 }
 982
 983 bool LayerTreeImpl::create_low_res_tiling() const {
 984   return layer_tree_host_impl_->create_low_res_tiling();
 985 }
 986
 987 void LayerTreeImpl::SetNeedsRedraw() {
 988   layer_tree_host_impl_->SetNeedsRedraw();
 989 }
 990
 991 AnimationRegistrar* LayerTreeImpl::GetAnimationRegistrar() const {
 992   return layer_tree_host_impl_->animation_registrar();
 993 }
 994
 995 void LayerTreeImpl::GetAllPrioritizedTilesForTracing(
 996     std::vector<PrioritizedTile>* prioritized_tiles) const {
 997   LayerIterator end = LayerIterator::End(&render_surface_layer_list_);
 998   for (LayerIterator it = LayerIterator::Begin(&render_surface_layer_list_);
 999        it != end; ++it) {
1000     if (!it.represents_itself())
1001       continue;
1002     LayerImpl* layer_impl = *it;
1003     layer_impl->GetAllPrioritizedTilesForTracing(prioritized_tiles);
1004   }
1005 }
1006
1007 void LayerTreeImpl::AsValueInto(base::trace_event::TracedValue* state) const {
1008   TracedValue::MakeDictIntoImplicitSnapshot(state, "cc::LayerTreeImpl", this);
1009   state->SetInteger("source_frame_number", source_frame_number_);
1010
1011   state->BeginDictionary("root_layer");
1012   root_layer_->AsValueInto(state);
1013   state->EndDictionary();
1014
1015   state->BeginArray("render_surface_layer_list");
1016   LayerIterator end = LayerIterator::End(&render_surface_layer_list_);
1017   for (LayerIterator it = LayerIterator::Begin(&render_surface_layer_list_);
1018        it != end; ++it) {
1019     if (!it.represents_itself())
1020       continue;
1021     TracedValue::AppendIDRef(*it, state);
1022   }
1023   state->EndArray();
1024
1025   state->BeginArray("swap_promise_trace_ids");
1026   for (auto* swap_promise : swap_promise_list_)
1027     state->AppendDouble(swap_promise->TraceId());
1028   state->EndArray();
1029
1030   state->BeginArray("pinned_swap_promise_trace_ids");
1031   for (auto* swap_promise : pinned_swap_promise_list_)
1032     state->AppendDouble(swap_promise->TraceId());
1033   state->EndArray();
1034 }
1035
1036 void LayerTreeImpl::SetRootLayerScrollOffsetDelegate(
1037     LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) {
1038   if (root_layer_scroll_offset_delegate_ == root_layer_scroll_offset_delegate)
1039     return;
1040
1041   root_layer_scroll_offset_delegate_ = root_layer_scroll_offset_delegate;
1042
1043   if (root_layer_scroll_offset_delegate_) {
1044     root_layer_scroll_offset_delegate_->UpdateRootLayerState(
1045         TotalScrollOffset(), TotalMaxScrollOffset(), ScrollableSize(),
1046         current_page_scale_factor(), min_page_scale_factor(),
1047         max_page_scale_factor());
1048
1049     DistributeRootScrollOffset();
1050   }
1051 }
1052
1053 void LayerTreeImpl::UpdateRootScrollOffsetDelegate() {
1054   DCHECK(root_layer_scroll_offset_delegate_);
1055
1056   gfx::ScrollOffset offset = InnerViewportScrollLayer()->CurrentScrollOffset();
1057
1058   if (OuterViewportScrollLayer())
1059     offset += OuterViewportScrollLayer()->CurrentScrollOffset();
1060
1061   root_layer_scroll_offset_delegate_->UpdateRootLayerState(
1062       offset, TotalMaxScrollOffset(), ScrollableSize(),
1063       current_page_scale_factor(), min_page_scale_factor(),
1064       max_page_scale_factor());
1065 }
1066
1067 void LayerTreeImpl::DistributeRootScrollOffset() {
1068   if (!root_layer_scroll_offset_delegate_)
1069     return;
1070
1071   gfx::ScrollOffset root_offset =
1072       root_layer_scroll_offset_delegate_->GetTotalScrollOffset();
1073
1074   if (!InnerViewportScrollLayer())
1075     return;
1076
1077   DCHECK(OuterViewportScrollLayer());
1078
1079   // If we get here, we have both inner/outer viewports, and need to distribute
1080   // the scroll offset between them.
1081   gfx::ScrollOffset inner_viewport_offset =
1082       InnerViewportScrollLayer()->CurrentScrollOffset();
1083   gfx::ScrollOffset outer_viewport_offset =
1084       OuterViewportScrollLayer()->CurrentScrollOffset();
1085
1086   // It may be nothing has changed.
1087   if (inner_viewport_offset + outer_viewport_offset == root_offset)
1088     return;
1089
1090   gfx::ScrollOffset max_outer_viewport_scroll_offset =
1091       OuterViewportScrollLayer()->MaxScrollOffset();
1092
1093   outer_viewport_offset = root_offset - inner_viewport_offset;
1094   outer_viewport_offset.SetToMin(max_outer_viewport_scroll_offset);
1095   outer_viewport_offset.SetToMax(gfx::ScrollOffset());
1096
1097   OuterViewportScrollLayer()->SetCurrentScrollOffsetFromDelegate(
1098       outer_viewport_offset);
1099   inner_viewport_offset = root_offset - outer_viewport_offset;
1100   InnerViewportScrollLayer()->SetCurrentScrollOffsetFromDelegate(
1101       inner_viewport_offset);
1102
1103   UpdateRootScrollOffsetDelegate();
1104 }
1105
1106 void LayerTreeImpl::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
1107   DCHECK(swap_promise);
1108   swap_promise_list_.push_back(swap_promise.Pass());
1109 }
1110
1111 void LayerTreeImpl::QueuePinnedSwapPromise(
1112     scoped_ptr<SwapPromise> swap_promise) {
1113   DCHECK(IsActiveTree());
1114   DCHECK(swap_promise);
1115   pinned_swap_promise_list_.push_back(swap_promise.Pass());
1116 }
1117
1118 void LayerTreeImpl::PassSwapPromises(
1119     ScopedPtrVector<SwapPromise>* new_swap_promise) {
1120   for (auto* swap_promise : swap_promise_list_)
1121     swap_promise->DidNotSwap(SwapPromise::SWAP_FAILS);
1122   swap_promise_list_.clear();
1123   swap_promise_list_.swap(*new_swap_promise);
1124 }
1125
1126 void LayerTreeImpl::FinishSwapPromises(CompositorFrameMetadata* metadata) {
1127   for (auto* swap_promise : swap_promise_list_)
1128     swap_promise->DidSwap(metadata);
1129   swap_promise_list_.clear();
1130   for (auto* swap_promise : pinned_swap_promise_list_)
1131     swap_promise->DidSwap(metadata);
1132   pinned_swap_promise_list_.clear();
1133 }
1134
1135 void LayerTreeImpl::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
1136   for (auto* swap_promise : swap_promise_list_)
1137     swap_promise->DidNotSwap(reason);
1138   swap_promise_list_.clear();
1139   for (auto* swap_promise : pinned_swap_promise_list_)
1140     swap_promise->DidNotSwap(reason);
1141   pinned_swap_promise_list_.clear();
1142 }
1143
1144 void LayerTreeImpl::DidModifyTilePriorities() {
1145   layer_tree_host_impl_->DidModifyTilePriorities();
1146 }
1147
1148 void LayerTreeImpl::set_ui_resource_request_queue(
1149     const UIResourceRequestQueue& queue) {
1150   ui_resource_request_queue_ = queue;
1151 }
1152
1153 ResourceId LayerTreeImpl::ResourceIdForUIResource(UIResourceId uid) const {
1154   return layer_tree_host_impl_->ResourceIdForUIResource(uid);
1155 }
1156
1157 bool LayerTreeImpl::IsUIResourceOpaque(UIResourceId uid) const {
1158   return layer_tree_host_impl_->IsUIResourceOpaque(uid);
1159 }
1160
1161 void LayerTreeImpl::ProcessUIResourceRequestQueue() {
1162   for (const auto& req : ui_resource_request_queue_) {
1163     switch (req.GetType()) {
1164       case UIResourceRequest::UI_RESOURCE_CREATE:
1165         layer_tree_host_impl_->CreateUIResource(req.GetId(), req.GetBitmap());
1166         break;
1167       case UIResourceRequest::UI_RESOURCE_DELETE:
1168         layer_tree_host_impl_->DeleteUIResource(req.GetId());
1169         break;
1170       case UIResourceRequest::UI_RESOURCE_INVALID_REQUEST:
1171         NOTREACHED();
1172         break;
1173     }
1174   }
1175   ui_resource_request_queue_.clear();
1176
1177   // If all UI resource evictions were not recreated by processing this queue,
1178   // then another commit is required.
1179   if (layer_tree_host_impl_->EvictedUIResourcesExist())
1180     layer_tree_host_impl_->SetNeedsCommit();
1181 }
1182
1183 void LayerTreeImpl::RegisterPictureLayerImpl(PictureLayerImpl* layer) {
1184   DCHECK(std::find(picture_layers_.begin(), picture_layers_.end(), layer) ==
1185          picture_layers_.end());
1186   picture_layers_.push_back(layer);
1187 }
1188
1189 void LayerTreeImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
1190   std::vector<PictureLayerImpl*>::iterator it =
1191       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
1192   DCHECK(it != picture_layers_.end());
1193   picture_layers_.erase(it);
1194 }
1195
1196 void LayerTreeImpl::AddLayerWithCopyOutputRequest(LayerImpl* layer) {
1197   // Only the active tree needs to know about layers with copy requests, as
1198   // they are aborted if not serviced during draw.
1199   DCHECK(IsActiveTree());
1200
1201   // DCHECK(std::find(layers_with_copy_output_request_.begin(),
1202   //                 layers_with_copy_output_request_.end(),
1203   //                 layer) == layers_with_copy_output_request_.end());
1204   // TODO(danakj): Remove this once crash is found crbug.com/309777
1205   for (size_t i = 0; i < layers_with_copy_output_request_.size(); ++i) {
1206     CHECK(layers_with_copy_output_request_[i] != layer)
1207         << i << " of " << layers_with_copy_output_request_.size();
1208   }
1209   layers_with_copy_output_request_.push_back(layer);
1210 }
1211
1212 void LayerTreeImpl::RemoveLayerWithCopyOutputRequest(LayerImpl* layer) {
1213   // Only the active tree needs to know about layers with copy requests, as
1214   // they are aborted if not serviced during draw.
1215   DCHECK(IsActiveTree());
1216
1217   std::vector<LayerImpl*>::iterator it = std::find(
1218       layers_with_copy_output_request_.begin(),
1219       layers_with_copy_output_request_.end(),
1220       layer);
1221   DCHECK(it != layers_with_copy_output_request_.end());
1222   layers_with_copy_output_request_.erase(it);
1223
1224   // TODO(danakj): Remove this once crash is found crbug.com/309777
1225   for (size_t i = 0; i < layers_with_copy_output_request_.size(); ++i) {
1226     CHECK(layers_with_copy_output_request_[i] != layer)
1227         << i << " of " << layers_with_copy_output_request_.size();
1228   }
1229 }
1230
1231 const std::vector<LayerImpl*>& LayerTreeImpl::LayersWithCopyOutputRequest()
1232     const {
1233   // Only the active tree needs to know about layers with copy requests, as
1234   // they are aborted if not serviced during draw.
1235   DCHECK(IsActiveTree());
1236
1237   return layers_with_copy_output_request_;
1238 }
1239
1240 template <typename LayerType>
1241 static inline bool LayerClipsSubtree(LayerType* layer) {
1242   return layer->masks_to_bounds() || layer->mask_layer();
1243 }
1244
1245 static bool PointHitsRect(
1246     const gfx::PointF& screen_space_point,
1247     const gfx::Transform& local_space_to_screen_space_transform,
1248     const gfx::Rect& local_space_rect,
1249     float* distance_to_camera) {
1250   // If the transform is not invertible, then assume that this point doesn't hit
1251   // this rect.
1252   gfx::Transform inverse_local_space_to_screen_space(
1253       gfx::Transform::kSkipInitialization);
1254   if (!local_space_to_screen_space_transform.GetInverse(
1255           &inverse_local_space_to_screen_space))
1256     return false;
1257
1258   // Transform the hit test point from screen space to the local space of the
1259   // given rect.
1260   bool clipped = false;
1261   gfx::Point3F planar_point = MathUtil::ProjectPoint3D(
1262       inverse_local_space_to_screen_space, screen_space_point, &clipped);
1263   gfx::PointF hit_test_point_in_local_space =
1264       gfx::PointF(planar_point.x(), planar_point.y());
1265
1266   // If ProjectPoint could not project to a valid value, then we assume that
1267   // this point doesn't hit this rect.
1268   if (clipped)
1269     return false;
1270
1271   if (!gfx::RectF(local_space_rect).Contains(hit_test_point_in_local_space))
1272     return false;
1273
1274   if (distance_to_camera) {
1275     // To compute the distance to the camera, we have to take the planar point
1276     // and pull it back to world space and compute the displacement along the
1277     // z-axis.
1278     gfx::Point3F planar_point_in_screen_space(planar_point);
1279     local_space_to_screen_space_transform.TransformPoint(
1280         &planar_point_in_screen_space);
1281     *distance_to_camera = planar_point_in_screen_space.z();
1282   }
1283
1284   return true;
1285 }
1286
1287 static bool PointHitsRegion(const gfx::PointF& screen_space_point,
1288                             const gfx::Transform& screen_space_transform,
1289                             const Region& layer_space_region) {
1290   // If the transform is not invertible, then assume that this point doesn't hit
1291   // this region.
1292   gfx::Transform inverse_screen_space_transform(
1293       gfx::Transform::kSkipInitialization);
1294   if (!screen_space_transform.GetInverse(&inverse_screen_space_transform))
1295     return false;
1296
1297   // Transform the hit test point from screen space to the local space of the
1298   // given region.
1299   bool clipped = false;
1300   gfx::PointF hit_test_point_in_layer_space = MathUtil::ProjectPoint(
1301       inverse_screen_space_transform, screen_space_point, &clipped);
1302
1303   // If ProjectPoint could not project to a valid value, then we assume that
1304   // this point doesn't hit this region.
1305   if (clipped)
1306     return false;
1307
1308   return layer_space_region.Contains(
1309       gfx::ToRoundedPoint(hit_test_point_in_layer_space));
1310 }
1311
1312 static const LayerImpl* GetNextClippingLayer(const LayerImpl* layer) {
1313   if (layer->scroll_parent())
1314     return layer->scroll_parent();
1315   if (layer->clip_parent())
1316     return layer->clip_parent();
1317   return layer->parent();
1318 }
1319
1320 static bool PointIsClippedBySurfaceOrClipRect(
1321     const gfx::PointF& screen_space_point,
1322     const LayerImpl* layer) {
1323   // Walk up the layer tree and hit-test any render_surfaces and any layer
1324   // clip rects that are active.
1325   for (; layer; layer = GetNextClippingLayer(layer)) {
1326     if (layer->render_surface() &&
1327         !PointHitsRect(screen_space_point,
1328                        layer->render_surface()->screen_space_transform(),
1329                        layer->render_surface()->content_rect(),
1330                        NULL))
1331       return true;
1332
1333     if (LayerClipsSubtree(layer) &&
1334         !PointHitsRect(screen_space_point, layer->screen_space_transform(),
1335                        gfx::Rect(layer->bounds()), NULL))
1336       return true;
1337   }
1338
1339   // If we have finished walking all ancestors without having already exited,
1340   // then the point is not clipped by any ancestors.
1341   return false;
1342 }
1343
1344 static bool PointHitsLayer(const LayerImpl* layer,
1345                            const gfx::PointF& screen_space_point,
1346                            float* distance_to_intersection) {
1347   gfx::Rect content_rect(layer->bounds());
1348   if (!PointHitsRect(screen_space_point,
1349                      layer->screen_space_transform(),
1350                      content_rect,
1351                      distance_to_intersection))
1352     return false;
1353
1354   // At this point, we think the point does hit the layer, but we need to walk
1355   // up the parents to ensure that the layer was not clipped in such a way
1356   // that the hit point actually should not hit the layer.
1357   if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer))
1358     return false;
1359
1360   // Skip the HUD layer.
1361   if (layer == layer->layer_tree_impl()->hud_layer())
1362     return false;
1363
1364   return true;
1365 }
1366
1367 struct FindClosestMatchingLayerDataForRecursion {
1368   FindClosestMatchingLayerDataForRecursion()
1369       : closest_match(NULL),
1370         closest_distance(-std::numeric_limits<float>::infinity()) {}
1371   LayerImpl* closest_match;
1372   // Note that the positive z-axis points towards the camera, so bigger means
1373   // closer in this case, counterintuitively.
1374   float closest_distance;
1375 };
1376
1377 template <typename Functor>
1378 static void FindClosestMatchingLayer(
1379     const gfx::PointF& screen_space_point,
1380     LayerImpl* layer,
1381     const Functor& func,
1382     FindClosestMatchingLayerDataForRecursion* data_for_recursion) {
1383   size_t children_size = layer->children().size();
1384   for (size_t i = 0; i < children_size; ++i) {
1385     size_t index = children_size - 1 - i;
1386     FindClosestMatchingLayer(screen_space_point, layer->children()[index], func,
1387                              data_for_recursion);
1388   }
1389
1390   float distance_to_intersection = 0.f;
1391   if (func(layer) &&
1392       PointHitsLayer(layer, screen_space_point, &distance_to_intersection) &&
1393       ((!data_for_recursion->closest_match ||
1394         distance_to_intersection > data_for_recursion->closest_distance))) {
1395     data_for_recursion->closest_distance = distance_to_intersection;
1396     data_for_recursion->closest_match = layer;
1397   }
1398 }
1399
1400 static bool ScrollsAnyDrawnRenderSurfaceLayerListMember(LayerImpl* layer) {
1401   if (!layer->scrollable())
1402     return false;
1403   if (layer->layer_or_descendant_is_drawn())
1404     return true;
1405
1406   if (!layer->scroll_children())
1407     return false;
1408   for (std::set<LayerImpl*>::const_iterator it =
1409            layer->scroll_children()->begin();
1410        it != layer->scroll_children()->end();
1411        ++it) {
1412     if ((*it)->layer_or_descendant_is_drawn())
1413       return true;
1414   }
1415   return false;
1416 }
1417
1418 struct FindScrollingLayerFunctor {
1419   bool operator()(LayerImpl* layer) const {
1420     return ScrollsAnyDrawnRenderSurfaceLayerListMember(layer);
1421   }
1422 };
1423
1424 LayerImpl* LayerTreeImpl::FindFirstScrollingLayerThatIsHitByPoint(
1425     const gfx::PointF& screen_space_point) {
1426   FindClosestMatchingLayerDataForRecursion data_for_recursion;
1427   FindClosestMatchingLayer(screen_space_point,
1428                            root_layer(),
1429                            FindScrollingLayerFunctor(),
1430                            &data_for_recursion);
1431   return data_for_recursion.closest_match;
1432 }
1433
1434 struct HitTestVisibleScrollableOrTouchableFunctor {
1435   bool operator()(LayerImpl* layer) const {
1436     return layer->IsDrawnRenderSurfaceLayerListMember() ||
1437            ScrollsAnyDrawnRenderSurfaceLayerListMember(layer) ||
1438            !layer->touch_event_handler_region().IsEmpty() ||
1439            layer->have_wheel_event_handlers();
1440   }
1441 };
1442
1443 LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPoint(
1444     const gfx::PointF& screen_space_point) {
1445   if (!root_layer())
1446     return NULL;
1447   bool update_lcd_text = false;
1448   if (!UpdateDrawProperties(update_lcd_text))
1449     return NULL;
1450   FindClosestMatchingLayerDataForRecursion data_for_recursion;
1451   FindClosestMatchingLayer(screen_space_point,
1452                            root_layer(),
1453                            HitTestVisibleScrollableOrTouchableFunctor(),
1454                            &data_for_recursion);
1455   return data_for_recursion.closest_match;
1456 }
1457
1458 static bool LayerHasTouchEventHandlersAt(const gfx::PointF& screen_space_point,
1459                                          LayerImpl* layer_impl) {
1460   if (layer_impl->touch_event_handler_region().IsEmpty())
1461     return false;
1462
1463   if (!PointHitsRegion(screen_space_point, layer_impl->screen_space_transform(),
1464                        layer_impl->touch_event_handler_region()))
1465     return false;
1466
1467   // At this point, we think the point does hit the touch event handler region
1468   // on the layer, but we need to walk up the parents to ensure that the layer
1469   // was not clipped in such a way that the hit point actually should not hit
1470   // the layer.
1471   if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl))
1472     return false;
1473
1474   return true;
1475 }
1476
1477 struct FindWheelEventLayerFunctor {
1478   bool operator()(LayerImpl* layer) const {
1479     return layer->have_wheel_event_handlers();
1480   }
1481 };
1482
1483 LayerImpl* LayerTreeImpl::FindLayerWithWheelHandlerThatIsHitByPoint(
1484     const gfx::PointF& screen_space_point) {
1485   if (!root_layer())
1486     return NULL;
1487   bool update_lcd_text = false;
1488   if (!UpdateDrawProperties(update_lcd_text))
1489     return NULL;
1490   FindWheelEventLayerFunctor func;
1491   FindClosestMatchingLayerDataForRecursion data_for_recursion;
1492   FindClosestMatchingLayer(screen_space_point, root_layer(), func,
1493                            &data_for_recursion);
1494   return data_for_recursion.closest_match;
1495 }
1496
1497 struct FindTouchEventLayerFunctor {
1498   bool operator()(LayerImpl* layer) const {
1499     return LayerHasTouchEventHandlersAt(screen_space_point, layer);
1500   }
1501   const gfx::PointF screen_space_point;
1502 };
1503
1504 LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPointInTouchHandlerRegion(
1505     const gfx::PointF& screen_space_point) {
1506   if (!root_layer())
1507     return NULL;
1508   bool update_lcd_text = false;
1509   if (!UpdateDrawProperties(update_lcd_text))
1510     return NULL;
1511   FindTouchEventLayerFunctor func = {screen_space_point};
1512   FindClosestMatchingLayerDataForRecursion data_for_recursion;
1513   FindClosestMatchingLayer(
1514       screen_space_point, root_layer(), func, &data_for_recursion);
1515   return data_for_recursion.closest_match;
1516 }
1517
1518 void LayerTreeImpl::RegisterSelection(const LayerSelection& selection) {
1519   selection_ = selection;
1520 }
1521
1522 static ViewportSelectionBound ComputeViewportSelectionBound(
1523     const LayerSelectionBound& layer_bound,
1524     LayerImpl* layer,
1525     float device_scale_factor) {
1526   ViewportSelectionBound viewport_bound;
1527   viewport_bound.type = layer_bound.type;
1528
1529   if (!layer || layer_bound.type == SELECTION_BOUND_EMPTY)
1530     return viewport_bound;
1531
1532   gfx::PointF layer_top = layer_bound.edge_top;
1533   gfx::PointF layer_bottom = layer_bound.edge_bottom;
1534
1535   bool clipped = false;
1536   gfx::PointF screen_top =
1537       MathUtil::MapPoint(layer->screen_space_transform(), layer_top, &clipped);
1538   gfx::PointF screen_bottom = MathUtil::MapPoint(
1539       layer->screen_space_transform(), layer_bottom, &clipped);
1540
1541   const float inv_scale = 1.f / device_scale_factor;
1542   viewport_bound.edge_top = gfx::ScalePoint(screen_top, inv_scale);
1543   viewport_bound.edge_bottom = gfx::ScalePoint(screen_bottom, inv_scale);
1544
1545   // The bottom edge point is used for visibility testing as it is the logical
1546   // focal point for bound selection handles (this may change in the future).
1547   // Shifting the visibility point fractionally inward ensures that neighboring
1548   // or logically coincident layers aligned to integral DPI coordinates will not
1549   // spuriously occlude the bound.
1550   gfx::Vector2dF visibility_offset = layer_top - layer_bottom;
1551   visibility_offset.Scale(device_scale_factor / visibility_offset.Length());
1552   gfx::PointF visibility_point = layer_bottom + visibility_offset;
1553   if (visibility_point.x() <= 0)
1554     visibility_point.set_x(visibility_point.x() + device_scale_factor);
1555   visibility_point = MathUtil::MapPoint(
1556       layer->screen_space_transform(), visibility_point, &clipped);
1557
1558   float intersect_distance = 0.f;
1559   viewport_bound.visible =
1560       PointHitsLayer(layer, visibility_point, &intersect_distance);
1561
1562   return viewport_bound;
1563 }
1564
1565 void LayerTreeImpl::GetViewportSelection(ViewportSelection* selection) {
1566   DCHECK(selection);
1567
1568   selection->start = ComputeViewportSelectionBound(
1569       selection_.start,
1570       selection_.start.layer_id ? LayerById(selection_.start.layer_id) : NULL,
1571       device_scale_factor());
1572   selection->is_editable = selection_.is_editable;
1573   selection->is_empty_text_form_control = selection_.is_empty_text_form_control;
1574   if (selection->start.type == SELECTION_BOUND_CENTER ||
1575       selection->start.type == SELECTION_BOUND_EMPTY) {
1576     selection->end = selection->start;
1577   } else {
1578     selection->end = ComputeViewportSelectionBound(
1579         selection_.end,
1580         selection_.end.layer_id ? LayerById(selection_.end.layer_id) : NULL,
1581         device_scale_factor());
1582   }
1583 }
1584
1585 void LayerTreeImpl::InputScrollAnimationFinished() {
1586   layer_tree_host_impl_->ScrollEnd();
1587 }
1588
1589 bool LayerTreeImpl::SmoothnessTakesPriority() const {
1590   return layer_tree_host_impl_->GetTreePriority() == SMOOTHNESS_TAKES_PRIORITY;
1591 }
1592
1593 BlockingTaskRunner* LayerTreeImpl::BlockingMainThreadTaskRunner() const {
1594   return proxy()->blocking_main_thread_task_runner();
1595 }
1596
1597 VideoFrameControllerClient* LayerTreeImpl::GetVideoFrameControllerClient()
1598     const {
1599   return layer_tree_host_impl_;
1600 }
1601
1602 void LayerTreeImpl::SetPendingPageScaleAnimation(
1603     scoped_ptr<PendingPageScaleAnimation> pending_animation) {
1604   pending_page_scale_animation_ = pending_animation.Pass();
1605 }
1606
1607 scoped_ptr<PendingPageScaleAnimation>
1608     LayerTreeImpl::TakePendingPageScaleAnimation() {
1609   return pending_page_scale_animation_.Pass();
1610 }
1611
1612 bool LayerTreeImpl::IsAnimatingFilterProperty(const LayerImpl* layer) const {
1613   LayerTreeType tree_type =
1614       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1615   return layer_tree_host_impl_->animation_host()
1616              ? layer_tree_host_impl_->animation_host()
1617                    ->IsAnimatingFilterProperty(layer->id(), tree_type)
1618              : false;
1619 }
1620
1621 bool LayerTreeImpl::IsAnimatingOpacityProperty(const LayerImpl* layer) const {
1622   LayerTreeType tree_type =
1623       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1624   return layer_tree_host_impl_->animation_host()
1625              ? layer_tree_host_impl_->animation_host()
1626                    ->IsAnimatingOpacityProperty(layer->id(), tree_type)
1627              : false;
1628 }
1629
1630 bool LayerTreeImpl::IsAnimatingTransformProperty(const LayerImpl* layer) const {
1631   LayerTreeType tree_type =
1632       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1633   return layer_tree_host_impl_->animation_host()
1634              ? layer_tree_host_impl_->animation_host()
1635                    ->IsAnimatingTransformProperty(layer->id(), tree_type)
1636              : false;
1637 }
1638
1639 bool LayerTreeImpl::HasPotentiallyRunningFilterAnimation(
1640     const LayerImpl* layer) const {
1641   LayerTreeType tree_type =
1642       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1643   return layer_tree_host_impl_->animation_host()
1644              ? layer_tree_host_impl_->animation_host()
1645                    ->HasPotentiallyRunningFilterAnimation(layer->id(),
1646                                                           tree_type)
1647              : false;
1648 }
1649
1650 bool LayerTreeImpl::HasPotentiallyRunningOpacityAnimation(
1651     const LayerImpl* layer) const {
1652   LayerTreeType tree_type =
1653       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1654   return layer_tree_host_impl_->animation_host()
1655              ? layer_tree_host_impl_->animation_host()
1656                    ->HasPotentiallyRunningOpacityAnimation(layer->id(),
1657                                                            tree_type)
1658              : false;
1659 }
1660
1661 bool LayerTreeImpl::HasPotentiallyRunningTransformAnimation(
1662     const LayerImpl* layer) const {
1663   LayerTreeType tree_type =
1664       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1665   return layer_tree_host_impl_->animation_host()
1666              ? layer_tree_host_impl_->animation_host()
1667                    ->HasPotentiallyRunningTransformAnimation(layer->id(),
1668                                                              tree_type)
1669              : false;
1670 }
1671
1672 bool LayerTreeImpl::HasAnyAnimationTargetingProperty(
1673     const LayerImpl* layer,
1674     Animation::TargetProperty property) const {
1675   return layer_tree_host_impl_->animation_host()
1676              ? layer_tree_host_impl_->animation_host()
1677                    ->HasAnyAnimationTargetingProperty(layer->id(), property)
1678              : false;
1679 }
1680
1681 bool LayerTreeImpl::FilterIsAnimatingOnImplOnly(const LayerImpl* layer) const {
1682   return layer_tree_host_impl_->animation_host()
1683              ? layer_tree_host_impl_->animation_host()
1684                    ->FilterIsAnimatingOnImplOnly(layer->id())
1685              : false;
1686 }
1687
1688 bool LayerTreeImpl::OpacityIsAnimatingOnImplOnly(const LayerImpl* layer) const {
1689   return layer_tree_host_impl_->animation_host()
1690              ? layer_tree_host_impl_->animation_host()
1691                    ->OpacityIsAnimatingOnImplOnly(layer->id())
1692              : false;
1693 }
1694
1695 bool LayerTreeImpl::TransformIsAnimatingOnImplOnly(
1696     const LayerImpl* layer) const {
1697   return layer_tree_host_impl_->animation_host()
1698              ? layer_tree_host_impl_->animation_host()
1699                    ->TransformIsAnimatingOnImplOnly(layer->id())
1700              : false;
1701 }
1702
1703 bool LayerTreeImpl::HasOnlyTranslationTransforms(const LayerImpl* layer) const {
1704   LayerTreeType tree_type =
1705       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1706   return layer_tree_host_impl_->animation_host()
1707              ? layer_tree_host_impl_->animation_host()
1708                    ->HasOnlyTranslationTransforms(layer->id(), tree_type)
1709              : true;
1710 }
1711
1712 bool LayerTreeImpl::MaximumTargetScale(const LayerImpl* layer,
1713                                        float* max_scale) const {
1714   *max_scale = 0.f;
1715   LayerTreeType tree_type =
1716       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1717   return layer_tree_host_impl_->animation_host()
1718              ? layer_tree_host_impl_->animation_host()->MaximumTargetScale(
1719                    layer->id(), tree_type, max_scale)
1720              : true;
1721 }
1722
1723 bool LayerTreeImpl::AnimationStartScale(const LayerImpl* layer,
1724                                         float* start_scale) const {
1725   *start_scale = 0.f;
1726   LayerTreeType tree_type =
1727       IsActiveTree() ? LayerTreeType::ACTIVE : LayerTreeType::PENDING;
1728   return layer_tree_host_impl_->animation_host()
1729              ? layer_tree_host_impl_->animation_host()->AnimationStartScale(
1730                    layer->id(), tree_type, start_scale)
1731              : true;
1732 }
1733
1734 bool LayerTreeImpl::HasFilterAnimationThatInflatesBounds(
1735     const LayerImpl* layer) const {
1736   return layer_tree_host_impl_->animation_host()
1737              ? layer_tree_host_impl_->animation_host()
1738                    ->HasFilterAnimationThatInflatesBounds(layer->id())
1739              : false;
1740 }
1741
1742 bool LayerTreeImpl::HasTransformAnimationThatInflatesBounds(
1743     const LayerImpl* layer) const {
1744   return layer_tree_host_impl_->animation_host()
1745              ? layer_tree_host_impl_->animation_host()
1746                    ->HasTransformAnimationThatInflatesBounds(layer->id())
1747              : false;
1748 }
1749
1750 bool LayerTreeImpl::HasAnimationThatInflatesBounds(
1751     const LayerImpl* layer) const {
1752   return layer_tree_host_impl_->animation_host()
1753              ? layer_tree_host_impl_->animation_host()
1754                    ->HasAnimationThatInflatesBounds(layer->id())
1755              : false;
1756 }
1757
1758 bool LayerTreeImpl::FilterAnimationBoundsForBox(const LayerImpl* layer,
1759                                                 const gfx::BoxF& box,
1760                                                 gfx::BoxF* bounds) const {
1761   return layer_tree_host_impl_->animation_host()
1762              ? layer_tree_host_impl_->animation_host()
1763                    ->FilterAnimationBoundsForBox(layer->id(), box, bounds)
1764              : false;
1765 }
1766
1767 bool LayerTreeImpl::TransformAnimationBoundsForBox(const LayerImpl* layer,
1768                                                    const gfx::BoxF& box,
1769                                                    gfx::BoxF* bounds) const {
1770   *bounds = gfx::BoxF();
1771   return layer_tree_host_impl_->animation_host()
1772              ? layer_tree_host_impl_->animation_host()
1773                    ->TransformAnimationBoundsForBox(layer->id(), box, bounds)
1774              : true;
1775 }
1776
1777 }  // namespace cc