cc/layers/layer.cc

   1 // Copyright 2010 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/layers/layer.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/atomic_sequence_num.h"
  10 #include "base/location.h"
  11 #include "base/metrics/histogram.h"
  12 #include "base/single_thread_task_runner.h"
  13 #include "base/time/time.h"
  14 #include "base/trace_event/trace_event.h"
  15 #include "cc/animation/animation.h"
  16 #include "cc/animation/animation_events.h"
  17 #include "cc/animation/animation_registrar.h"
  18 #include "cc/animation/keyframed_animation_curve.h"
  19 #include "cc/animation/layer_animation_controller.h"
  20 #include "cc/base/simple_enclosed_region.h"
  21 #include "cc/debug/frame_viewer_instrumentation.h"
  22 #include "cc/layers/layer_client.h"
  23 #include "cc/layers/layer_impl.h"
  24 #include "cc/layers/scrollbar_layer_interface.h"
  25 #include "cc/output/copy_output_request.h"
  26 #include "cc/output/copy_output_result.h"
  27 #include "cc/trees/layer_tree_host.h"
  28 #include "cc/trees/layer_tree_impl.h"
  29 #include "third_party/skia/include/core/SkImageFilter.h"
  30 #include "ui/gfx/geometry/rect_conversions.h"
  31 #include "ui/gfx/geometry/vector2d_conversions.h"
  32
  33 namespace cc {
  34
  35 base::StaticAtomicSequenceNumber g_next_layer_id;
  36
  37 scoped_refptr<Layer> Layer::Create(const LayerSettings& settings) {
  38   return make_scoped_refptr(new Layer(settings));
  39 }
  40
  41 Layer::Layer(const LayerSettings& settings)
  42     : needs_push_properties_(false),
  43       num_dependents_need_push_properties_(0),
  44       stacking_order_changed_(false),
  45       // Layer IDs start from 1.
  46       layer_id_(g_next_layer_id.GetNext() + 1),
  47       ignore_set_needs_commit_(false),
  48       sorting_context_id_(0),
  49       parent_(nullptr),
  50       layer_tree_host_(nullptr),
  51       scroll_clip_layer_id_(INVALID_ID),
  52       num_descendants_that_draw_content_(0),
  53       transform_tree_index_(-1),
  54       effect_tree_index_(-1),
  55       clip_tree_index_(-1),
  56       property_tree_sequence_number_(-1),
  57       num_layer_or_descendants_with_copy_request_(0),
  58       num_layer_or_descendants_with_input_handler_(0),
  59       num_children_with_scroll_parent_(0),
  60       should_flatten_transform_from_property_tree_(false),
  61       is_clipped_(false),
  62       should_scroll_on_main_thread_(false),
  63       have_wheel_event_handlers_(false),
  64       have_scroll_event_handlers_(false),
  65       user_scrollable_horizontal_(true),
  66       user_scrollable_vertical_(true),
  67       is_root_for_isolated_group_(false),
  68       is_container_for_fixed_position_layers_(false),
  69       is_drawable_(false),
  70       draws_content_(false),
  71       hide_layer_and_subtree_(false),
  72       masks_to_bounds_(false),
  73       contents_opaque_(false),
  74       double_sided_(true),
  75       should_flatten_transform_(true),
  76       use_parent_backface_visibility_(false),
  77       force_render_surface_(false),
  78       transform_is_invertible_(true),
  79       has_render_surface_(false),
  80       scroll_blocks_on_(SCROLL_BLOCKS_ON_NONE),
  81       background_color_(0),
  82       opacity_(1.f),
  83       blend_mode_(SkXfermode::kSrcOver_Mode),
  84       draw_blend_mode_(SkXfermode::kSrcOver_Mode),
  85       scroll_parent_(nullptr),
  86       layer_or_descendant_is_drawn_tracker_(0),
  87       sorted_for_recursion_tracker_(0),
  88       visited_tracker_(0),
  89       clip_parent_(nullptr),
  90       replica_layer_(nullptr),
  91       client_(nullptr),
  92       frame_timing_requests_dirty_(false) {
  93   if (!settings.use_compositor_animation_timelines) {
  94     layer_animation_controller_ = LayerAnimationController::Create(layer_id_);
  95     layer_animation_controller_->AddValueObserver(this);
  96     layer_animation_controller_->set_value_provider(this);
  97   }
  98 }
  99
 100 Layer::~Layer() {
 101   // Our parent should be holding a reference to us so there should be no
 102   // way for us to be destroyed while we still have a parent.
 103   DCHECK(!parent());
 104   // Similarly we shouldn't have a layer tree host since it also keeps a
 105   // reference to us.
 106   DCHECK(!layer_tree_host());
 107
 108   if (layer_animation_controller_) {
 109     layer_animation_controller_->RemoveValueObserver(this);
 110     layer_animation_controller_->remove_value_provider(this);
 111   }
 112
 113   RemoveFromScrollTree();
 114   RemoveFromClipTree();
 115
 116   // Remove the parent reference from all children and dependents.
 117   RemoveAllChildren();
 118   if (mask_layer_.get()) {
 119     DCHECK_EQ(this, mask_layer_->parent());
 120     mask_layer_->RemoveFromParent();
 121   }
 122   if (replica_layer_.get()) {
 123     DCHECK_EQ(this, replica_layer_->parent());
 124     replica_layer_->RemoveFromParent();
 125   }
 126 }
 127
 128 void Layer::SetLayerTreeHost(LayerTreeHost* host) {
 129   if (layer_tree_host_ == host)
 130     return;
 131
 132   if (layer_tree_host_) {
 133     layer_tree_host_->property_trees()->needs_rebuild = true;
 134     layer_tree_host_->UnregisterLayer(this);
 135   }
 136   if (host) {
 137     host->property_trees()->needs_rebuild = true;
 138     host->RegisterLayer(this);
 139   }
 140
 141   InvalidatePropertyTreesIndices();
 142
 143   layer_tree_host_ = host;
 144
 145   // When changing hosts, the layer needs to commit its properties to the impl
 146   // side for the new host.
 147   SetNeedsPushProperties();
 148
 149   for (size_t i = 0; i < children_.size(); ++i)
 150     children_[i]->SetLayerTreeHost(host);
 151
 152   if (mask_layer_.get())
 153     mask_layer_->SetLayerTreeHost(host);
 154   if (replica_layer_.get())
 155     replica_layer_->SetLayerTreeHost(host);
 156
 157   if (host)
 158     RegisterForAnimations(host->animation_registrar());
 159
 160   bool has_any_animation = false;
 161   if (layer_animation_controller_)
 162     has_any_animation = layer_animation_controller_->has_any_animation();
 163   else if (layer_tree_host_)
 164     has_any_animation = layer_tree_host_->HasAnyAnimation(this);
 165
 166   if (host && has_any_animation)
 167     host->SetNeedsCommit();
 168 }
 169
 170 void Layer::SetNeedsUpdate() {
 171   if (layer_tree_host_ && !ignore_set_needs_commit_)
 172     layer_tree_host_->SetNeedsUpdateLayers();
 173 }
 174
 175 void Layer::SetNeedsCommit() {
 176   if (!layer_tree_host_)
 177     return;
 178
 179   SetNeedsPushProperties();
 180   layer_tree_host_->property_trees()->needs_rebuild = true;
 181
 182   if (ignore_set_needs_commit_)
 183     return;
 184
 185   layer_tree_host_->SetNeedsCommit();
 186 }
 187
 188 void Layer::SetNeedsCommitNoRebuild() {
 189   if (!layer_tree_host_)
 190     return;
 191
 192   SetNeedsPushProperties();
 193
 194   if (ignore_set_needs_commit_)
 195     return;
 196
 197   layer_tree_host_->SetNeedsCommit();
 198 }
 199
 200 void Layer::SetNeedsFullTreeSync() {
 201   if (!layer_tree_host_)
 202     return;
 203
 204   layer_tree_host_->SetNeedsFullTreeSync();
 205 }
 206
 207 void Layer::SetNextCommitWaitsForActivation() {
 208   if (!layer_tree_host_)
 209     return;
 210
 211   layer_tree_host_->SetNextCommitWaitsForActivation();
 212 }
 213
 214 void Layer::SetNeedsPushProperties() {
 215   if (needs_push_properties_)
 216     return;
 217   if (!parent_should_know_need_push_properties() && parent_)
 218     parent_->AddDependentNeedsPushProperties();
 219   needs_push_properties_ = true;
 220 }
 221
 222 void Layer::AddDependentNeedsPushProperties() {
 223   DCHECK_GE(num_dependents_need_push_properties_, 0);
 224
 225   if (!parent_should_know_need_push_properties() && parent_)
 226     parent_->AddDependentNeedsPushProperties();
 227
 228   num_dependents_need_push_properties_++;
 229 }
 230
 231 void Layer::RemoveDependentNeedsPushProperties() {
 232   num_dependents_need_push_properties_--;
 233   DCHECK_GE(num_dependents_need_push_properties_, 0);
 234
 235   if (!parent_should_know_need_push_properties() && parent_)
 236       parent_->RemoveDependentNeedsPushProperties();
 237 }
 238
 239 bool Layer::IsPropertyChangeAllowed() const {
 240   if (!layer_tree_host_)
 241     return true;
 242
 243   if (!layer_tree_host_->settings().strict_layer_property_change_checking)
 244     return true;
 245
 246   return !layer_tree_host_->in_paint_layer_contents();
 247 }
 248
 249 skia::RefPtr<SkPicture> Layer::GetPicture() const {
 250   return skia::RefPtr<SkPicture>();
 251 }
 252
 253 void Layer::SetParent(Layer* layer) {
 254   DCHECK(!layer || !layer->HasAncestor(this));
 255
 256   if (parent_should_know_need_push_properties()) {
 257     if (parent_)
 258       parent_->RemoveDependentNeedsPushProperties();
 259     if (layer)
 260       layer->AddDependentNeedsPushProperties();
 261   }
 262
 263   parent_ = layer;
 264   SetLayerTreeHost(parent_ ? parent_->layer_tree_host() : nullptr);
 265
 266   if (!layer_tree_host_)
 267     return;
 268
 269   layer_tree_host_->property_trees()->needs_rebuild = true;
 270 }
 271
 272 void Layer::AddChild(scoped_refptr<Layer> child) {
 273   InsertChild(child, children_.size());
 274 }
 275
 276 void Layer::InsertChild(scoped_refptr<Layer> child, size_t index) {
 277   DCHECK(IsPropertyChangeAllowed());
 278   child->RemoveFromParent();
 279   AddDrawableDescendants(child->NumDescendantsThatDrawContent() +
 280                          (child->DrawsContent() ? 1 : 0));
 281   child->SetParent(this);
 282   child->stacking_order_changed_ = true;
 283
 284   index = std::min(index, children_.size());
 285   children_.insert(children_.begin() + index, child);
 286   SetNeedsFullTreeSync();
 287 }
 288
 289 void Layer::RemoveFromParent() {
 290   DCHECK(IsPropertyChangeAllowed());
 291   if (parent_)
 292     parent_->RemoveChildOrDependent(this);
 293 }
 294
 295 void Layer::RemoveChildOrDependent(Layer* child) {
 296   if (mask_layer_.get() == child) {
 297     mask_layer_->SetParent(nullptr);
 298     mask_layer_ = nullptr;
 299     SetNeedsFullTreeSync();
 300     return;
 301   }
 302   if (replica_layer_.get() == child) {
 303     replica_layer_->SetParent(nullptr);
 304     replica_layer_ = nullptr;
 305     SetNeedsFullTreeSync();
 306     return;
 307   }
 308
 309   for (LayerList::iterator iter = children_.begin();
 310        iter != children_.end();
 311        ++iter) {
 312     if (iter->get() != child)
 313       continue;
 314
 315     child->SetParent(nullptr);
 316     AddDrawableDescendants(-child->NumDescendantsThatDrawContent() -
 317                            (child->DrawsContent() ? 1 : 0));
 318     children_.erase(iter);
 319     SetNeedsFullTreeSync();
 320     return;
 321   }
 322 }
 323
 324 void Layer::ReplaceChild(Layer* reference, scoped_refptr<Layer> new_layer) {
 325   DCHECK(reference);
 326   DCHECK_EQ(reference->parent(), this);
 327   DCHECK(IsPropertyChangeAllowed());
 328
 329   if (reference == new_layer.get())
 330     return;
 331
 332   // Find the index of |reference| in |children_|.
 333   auto reference_it =
 334       std::find_if(children_.begin(), children_.end(),
 335                    [reference](const scoped_refptr<Layer>& layer) {
 336                      return layer.get() == reference;
 337                    });
 338   DCHECK(reference_it != children_.end());
 339   size_t reference_index = reference_it - children_.begin();
 340   reference->RemoveFromParent();
 341
 342   if (new_layer.get()) {
 343     new_layer->RemoveFromParent();
 344     InsertChild(new_layer, reference_index);
 345   }
 346 }
 347
 348 void Layer::SetBounds(const gfx::Size& size) {
 349   DCHECK(IsPropertyChangeAllowed());
 350   if (bounds() == size)
 351     return;
 352   bounds_ = size;
 353
 354   if (!layer_tree_host_)
 355     return;
 356
 357   if (ClipNode* clip_node = layer_tree_host_->property_trees()->clip_tree.Node(
 358           clip_tree_index())) {
 359     if (clip_node->owner_id == id()) {
 360       clip_node->data.clip.set_size(size);
 361       layer_tree_host_->property_trees()->clip_tree.set_needs_update(true);
 362     }
 363   }
 364
 365   SetNeedsCommitNoRebuild();
 366 }
 367
 368 Layer* Layer::RootLayer() {
 369   Layer* layer = this;
 370   while (layer->parent())
 371     layer = layer->parent();
 372   return layer;
 373 }
 374
 375 void Layer::RemoveAllChildren() {
 376   DCHECK(IsPropertyChangeAllowed());
 377   while (children_.size()) {
 378     Layer* layer = children_[0].get();
 379     DCHECK_EQ(this, layer->parent());
 380     layer->RemoveFromParent();
 381   }
 382 }
 383
 384 void Layer::SetChildren(const LayerList& children) {
 385   DCHECK(IsPropertyChangeAllowed());
 386   if (children == children_)
 387     return;
 388
 389   RemoveAllChildren();
 390   for (size_t i = 0; i < children.size(); ++i)
 391     AddChild(children[i]);
 392 }
 393
 394 bool Layer::HasAncestor(const Layer* ancestor) const {
 395   for (const Layer* layer = parent(); layer; layer = layer->parent()) {
 396     if (layer == ancestor)
 397       return true;
 398   }
 399   return false;
 400 }
 401
 402 void Layer::RequestCopyOfOutput(
 403     scoped_ptr<CopyOutputRequest> request) {
 404   DCHECK(IsPropertyChangeAllowed());
 405   bool had_no_copy_requests = copy_requests_.empty();
 406   if (void* source = request->source()) {
 407     auto it = std::find_if(
 408         copy_requests_.begin(), copy_requests_.end(),
 409         [source](const CopyOutputRequest* x) { return x->source() == source; });
 410     if (it != copy_requests_.end())
 411       copy_requests_.erase(it);
 412   }
 413   if (request->IsEmpty())
 414     return;
 415   copy_requests_.push_back(request.Pass());
 416   if (had_no_copy_requests) {
 417     bool copy_request_added = true;
 418     UpdateNumCopyRequestsForSubtree(copy_request_added);
 419   }
 420   SetNeedsCommit();
 421 }
 422
 423 void Layer::UpdateNumCopyRequestsForSubtree(bool add) {
 424   int change = add ? 1 : -1;
 425   for (Layer* layer = this; layer; layer = layer->parent()) {
 426     layer->num_layer_or_descendants_with_copy_request_ += change;
 427     layer->draw_properties().layer_or_descendant_has_copy_request =
 428         (layer->num_layer_or_descendants_with_copy_request_ != 0);
 429     DCHECK_GE(layer->num_layer_or_descendants_with_copy_request_, 0);
 430   }
 431 }
 432
 433 void Layer::SetBackgroundColor(SkColor background_color) {
 434   DCHECK(IsPropertyChangeAllowed());
 435   if (background_color_ == background_color)
 436     return;
 437   background_color_ = background_color;
 438   SetNeedsCommit();
 439 }
 440
 441 SkColor Layer::SafeOpaqueBackgroundColor() const {
 442   SkColor color = background_color();
 443   if (SkColorGetA(color) == 255 && !contents_opaque()) {
 444     color = SK_ColorTRANSPARENT;
 445   } else if (SkColorGetA(color) != 255 && contents_opaque()) {
 446     for (const Layer* layer = parent(); layer;
 447          layer = layer->parent()) {
 448       color = layer->background_color();
 449       if (SkColorGetA(color) == 255)
 450         break;
 451     }
 452     if (SkColorGetA(color) != 255)
 453       color = layer_tree_host_->background_color();
 454     if (SkColorGetA(color) != 255)
 455       color = SkColorSetA(color, 255);
 456   }
 457   return color;
 458 }
 459
 460 void Layer::SetMasksToBounds(bool masks_to_bounds) {
 461   DCHECK(IsPropertyChangeAllowed());
 462   if (masks_to_bounds_ == masks_to_bounds)
 463     return;
 464   masks_to_bounds_ = masks_to_bounds;
 465   SetNeedsCommit();
 466 }
 467
 468 void Layer::SetMaskLayer(Layer* mask_layer) {
 469   DCHECK(IsPropertyChangeAllowed());
 470   if (mask_layer_.get() == mask_layer)
 471     return;
 472   if (mask_layer_.get()) {
 473     DCHECK_EQ(this, mask_layer_->parent());
 474     mask_layer_->RemoveFromParent();
 475   }
 476   mask_layer_ = mask_layer;
 477   if (mask_layer_.get()) {
 478     DCHECK(!mask_layer_->parent());
 479     mask_layer_->RemoveFromParent();
 480     mask_layer_->SetParent(this);
 481     mask_layer_->SetIsMask(true);
 482   }
 483   SetNeedsFullTreeSync();
 484 }
 485
 486 void Layer::SetReplicaLayer(Layer* layer) {
 487   DCHECK(IsPropertyChangeAllowed());
 488   if (replica_layer_.get() == layer)
 489     return;
 490   if (replica_layer_.get()) {
 491     DCHECK_EQ(this, replica_layer_->parent());
 492     replica_layer_->RemoveFromParent();
 493   }
 494   replica_layer_ = layer;
 495   if (replica_layer_.get()) {
 496     DCHECK(!replica_layer_->parent());
 497     replica_layer_->RemoveFromParent();
 498     replica_layer_->SetParent(this);
 499   }
 500   SetNeedsFullTreeSync();
 501 }
 502
 503 void Layer::SetFilters(const FilterOperations& filters) {
 504   DCHECK(IsPropertyChangeAllowed());
 505   if (filters_ == filters)
 506     return;
 507   filters_ = filters;
 508   SetNeedsCommit();
 509 }
 510
 511 bool Layer::FilterIsAnimating() const {
 512   DCHECK(layer_tree_host_);
 513   return layer_animation_controller_
 514              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
 515                    Animation::FILTER,
 516                    LayerAnimationController::ObserverType::ACTIVE)
 517              : layer_tree_host_->IsAnimatingFilterProperty(this);
 518 }
 519
 520 bool Layer::HasPotentiallyRunningFilterAnimation() const {
 521   if (layer_animation_controller_) {
 522     return layer_animation_controller_->IsPotentiallyAnimatingProperty(
 523         Animation::FILTER, LayerAnimationController::ObserverType::ACTIVE);
 524   }
 525   return layer_tree_host_->HasPotentiallyRunningFilterAnimation(this);
 526 }
 527
 528 void Layer::SetBackgroundFilters(const FilterOperations& filters) {
 529   DCHECK(IsPropertyChangeAllowed());
 530   if (background_filters_ == filters)
 531     return;
 532   background_filters_ = filters;
 533   SetNeedsCommit();
 534 }
 535
 536 void Layer::SetOpacity(float opacity) {
 537   DCHECK(IsPropertyChangeAllowed());
 538   if (opacity_ == opacity)
 539     return;
 540   opacity_ = opacity;
 541   SetNeedsCommit();
 542 }
 543
 544 bool Layer::OpacityIsAnimating() const {
 545   DCHECK(layer_tree_host_);
 546   return layer_animation_controller_
 547              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
 548                    Animation::OPACITY,
 549                    LayerAnimationController::ObserverType::ACTIVE)
 550              : layer_tree_host_->IsAnimatingOpacityProperty(this);
 551 }
 552
 553 bool Layer::HasPotentiallyRunningOpacityAnimation() const {
 554   if (layer_animation_controller_) {
 555     return layer_animation_controller_->IsPotentiallyAnimatingProperty(
 556         Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE);
 557   }
 558   return layer_tree_host_->HasPotentiallyRunningOpacityAnimation(this);
 559 }
 560
 561 bool Layer::OpacityCanAnimateOnImplThread() const {
 562   return false;
 563 }
 564
 565 void Layer::SetBlendMode(SkXfermode::Mode blend_mode) {
 566   DCHECK(IsPropertyChangeAllowed());
 567   if (blend_mode_ == blend_mode)
 568     return;
 569
 570   // Allowing only blend modes that are defined in the CSS Compositing standard:
 571   // http://dev.w3.org/fxtf/compositing-1/#blending
 572   switch (blend_mode) {
 573     case SkXfermode::kSrcOver_Mode:
 574     case SkXfermode::kScreen_Mode:
 575     case SkXfermode::kOverlay_Mode:
 576     case SkXfermode::kDarken_Mode:
 577     case SkXfermode::kLighten_Mode:
 578     case SkXfermode::kColorDodge_Mode:
 579     case SkXfermode::kColorBurn_Mode:
 580     case SkXfermode::kHardLight_Mode:
 581     case SkXfermode::kSoftLight_Mode:
 582     case SkXfermode::kDifference_Mode:
 583     case SkXfermode::kExclusion_Mode:
 584     case SkXfermode::kMultiply_Mode:
 585     case SkXfermode::kHue_Mode:
 586     case SkXfermode::kSaturation_Mode:
 587     case SkXfermode::kColor_Mode:
 588     case SkXfermode::kLuminosity_Mode:
 589       // supported blend modes
 590       break;
 591     case SkXfermode::kClear_Mode:
 592     case SkXfermode::kSrc_Mode:
 593     case SkXfermode::kDst_Mode:
 594     case SkXfermode::kDstOver_Mode:
 595     case SkXfermode::kSrcIn_Mode:
 596     case SkXfermode::kDstIn_Mode:
 597     case SkXfermode::kSrcOut_Mode:
 598     case SkXfermode::kDstOut_Mode:
 599     case SkXfermode::kSrcATop_Mode:
 600     case SkXfermode::kDstATop_Mode:
 601     case SkXfermode::kXor_Mode:
 602     case SkXfermode::kPlus_Mode:
 603     case SkXfermode::kModulate_Mode:
 604       // Porter Duff Compositing Operators are not yet supported
 605       // http://dev.w3.org/fxtf/compositing-1/#porterduffcompositingoperators
 606       NOTREACHED();
 607       return;
 608   }
 609
 610   blend_mode_ = blend_mode;
 611   SetNeedsCommit();
 612 }
 613
 614 void Layer::SetIsRootForIsolatedGroup(bool root) {
 615   DCHECK(IsPropertyChangeAllowed());
 616   if (is_root_for_isolated_group_ == root)
 617     return;
 618   is_root_for_isolated_group_ = root;
 619   SetNeedsCommit();
 620 }
 621
 622 void Layer::SetContentsOpaque(bool opaque) {
 623   DCHECK(IsPropertyChangeAllowed());
 624   if (contents_opaque_ == opaque)
 625     return;
 626   contents_opaque_ = opaque;
 627   SetNeedsCommit();
 628 }
 629
 630 void Layer::SetPosition(const gfx::PointF& position) {
 631   DCHECK(IsPropertyChangeAllowed());
 632   if (position_ == position)
 633     return;
 634   position_ = position;
 635
 636   if (!layer_tree_host_)
 637     return;
 638
 639   if (TransformNode* transform_node =
 640           layer_tree_host_->property_trees()->transform_tree.Node(
 641               transform_tree_index())) {
 642     if (transform_node->owner_id == id()) {
 643       transform_node->data.update_post_local_transform(position,
 644                                                        transform_origin());
 645       transform_node->data.needs_local_transform_update = true;
 646       layer_tree_host_->property_trees()->transform_tree.set_needs_update(true);
 647       SetNeedsCommitNoRebuild();
 648       return;
 649     }
 650   }
 651
 652   SetNeedsCommit();
 653 }
 654
 655 bool Layer::IsContainerForFixedPositionLayers() const {
 656   if (!transform_.IsIdentityOrTranslation())
 657     return true;
 658   if (parent_ && !parent_->transform_.IsIdentityOrTranslation())
 659     return true;
 660   return is_container_for_fixed_position_layers_;
 661 }
 662
 663 bool Are2dAxisAligned(const gfx::Transform& a,
 664                       const gfx::Transform& b,
 665                       bool* is_invertible) {
 666   if (a.IsScaleOrTranslation() && b.IsScaleOrTranslation()) {
 667     *is_invertible = b.IsInvertible();
 668     return true;
 669   }
 670
 671   gfx::Transform inverse(gfx::Transform::kSkipInitialization);
 672   *is_invertible = b.GetInverse(&inverse);
 673
 674   inverse *= a;
 675   return inverse.Preserves2dAxisAlignment();
 676 }
 677
 678 void Layer::SetTransform(const gfx::Transform& transform) {
 679   DCHECK(IsPropertyChangeAllowed());
 680   if (transform_ == transform)
 681     return;
 682
 683   if (layer_tree_host_) {
 684     if (TransformNode* transform_node =
 685             layer_tree_host_->property_trees()->transform_tree.Node(
 686                 transform_tree_index())) {
 687       if (transform_node->owner_id == id()) {
 688         // We need to trigger a rebuild if we could have affected 2d axis
 689         // alignment. We'll check to see if transform and transform_ are axis
 690         // align with respect to one another.
 691         bool invertible = false;
 692         bool preserves_2d_axis_alignment =
 693             Are2dAxisAligned(transform_, transform, &invertible);
 694         transform_node->data.local = transform;
 695         transform_node->data.needs_local_transform_update = true;
 696         layer_tree_host_->property_trees()->transform_tree.set_needs_update(
 697             true);
 698         if (preserves_2d_axis_alignment)
 699           SetNeedsCommitNoRebuild();
 700         else
 701           SetNeedsCommit();
 702         transform_ = transform;
 703         transform_is_invertible_ = invertible;
 704         return;
 705       }
 706     }
 707   }
 708
 709   transform_ = transform;
 710   transform_is_invertible_ = transform.IsInvertible();
 711
 712   SetNeedsCommit();
 713 }
 714
 715 void Layer::SetTransformOrigin(const gfx::Point3F& transform_origin) {
 716   DCHECK(IsPropertyChangeAllowed());
 717   if (transform_origin_ == transform_origin)
 718     return;
 719   transform_origin_ = transform_origin;
 720
 721   if (!layer_tree_host_)
 722     return;
 723
 724   if (TransformNode* transform_node =
 725           layer_tree_host_->property_trees()->transform_tree.Node(
 726               transform_tree_index())) {
 727     if (transform_node->owner_id == id()) {
 728       transform_node->data.update_pre_local_transform(transform_origin);
 729       transform_node->data.update_post_local_transform(position(),
 730                                                        transform_origin);
 731       transform_node->data.needs_local_transform_update = true;
 732       layer_tree_host_->property_trees()->transform_tree.set_needs_update(true);
 733       SetNeedsCommitNoRebuild();
 734       return;
 735     }
 736   }
 737
 738   SetNeedsCommit();
 739 }
 740
 741 bool Layer::AnimationsPreserveAxisAlignment() const {
 742   DCHECK(layer_tree_host_);
 743   return layer_animation_controller_
 744              ? layer_animation_controller_->AnimationsPreserveAxisAlignment()
 745              : layer_tree_host_->AnimationsPreserveAxisAlignment(this);
 746 }
 747
 748 bool Layer::TransformIsAnimating() const {
 749   DCHECK(layer_tree_host_);
 750   return layer_animation_controller_
 751              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
 752                    Animation::TRANSFORM,
 753                    LayerAnimationController::ObserverType::ACTIVE)
 754              : layer_tree_host_->IsAnimatingTransformProperty(this);
 755 }
 756
 757 bool Layer::HasPotentiallyRunningTransformAnimation() const {
 758   if (layer_animation_controller_) {
 759     return layer_animation_controller_->IsPotentiallyAnimatingProperty(
 760         Animation::TRANSFORM, LayerAnimationController::ObserverType::ACTIVE);
 761   }
 762   return layer_tree_host_->HasPotentiallyRunningTransformAnimation(this);
 763 }
 764
 765 bool Layer::HasAnyAnimationTargetingProperty(
 766     Animation::TargetProperty property) const {
 767   if (layer_animation_controller_)
 768     return !!layer_animation_controller_->GetAnimation(property);
 769
 770   return layer_tree_host_->HasAnyAnimationTargetingProperty(this, property);
 771 }
 772
 773 bool Layer::ScrollOffsetAnimationWasInterrupted() const {
 774   DCHECK(layer_tree_host_);
 775   return layer_animation_controller_
 776              ? layer_animation_controller_
 777                    ->scroll_offset_animation_was_interrupted()
 778              : layer_tree_host_->ScrollOffsetAnimationWasInterrupted(this);
 779 }
 780
 781 void Layer::SetScrollParent(Layer* parent) {
 782   DCHECK(IsPropertyChangeAllowed());
 783   if (scroll_parent_ == parent)
 784     return;
 785
 786   if (scroll_parent_)
 787     scroll_parent_->RemoveScrollChild(this);
 788
 789   scroll_parent_ = parent;
 790
 791   if (scroll_parent_)
 792     scroll_parent_->AddScrollChild(this);
 793
 794   SetNeedsCommit();
 795 }
 796
 797 void Layer::AddScrollChild(Layer* child) {
 798   if (!scroll_children_)
 799     scroll_children_.reset(new std::set<Layer*>);
 800   scroll_children_->insert(child);
 801   if (layer_tree_host_ && !layer_tree_host_->needs_meta_info_recomputation()) {
 802     num_children_with_scroll_parent_++;
 803     draw_properties().has_child_with_a_scroll_parent = true;
 804   }
 805   SetNeedsCommit();
 806 }
 807
 808 void Layer::RemoveScrollChild(Layer* child) {
 809   scroll_children_->erase(child);
 810   if (scroll_children_->empty())
 811     scroll_children_ = nullptr;
 812   if (layer_tree_host_ && !layer_tree_host_->needs_meta_info_recomputation()) {
 813     num_children_with_scroll_parent_--;
 814     DCHECK_GE(num_children_with_scroll_parent_, 0);
 815     draw_properties().has_child_with_a_scroll_parent =
 816         (num_children_with_scroll_parent_ != 0);
 817   }
 818   SetNeedsCommit();
 819 }
 820
 821 void Layer::SetClipParent(Layer* ancestor) {
 822   DCHECK(IsPropertyChangeAllowed());
 823   if (clip_parent_ == ancestor)
 824     return;
 825
 826   if (clip_parent_)
 827     clip_parent_->RemoveClipChild(this);
 828
 829   clip_parent_ = ancestor;
 830
 831   if (clip_parent_)
 832     clip_parent_->AddClipChild(this);
 833
 834   SetNeedsCommit();
 835   if (layer_tree_host_)
 836     layer_tree_host_->SetNeedsMetaInfoRecomputation(true);
 837 }
 838
 839 void Layer::AddClipChild(Layer* child) {
 840   if (!clip_children_)
 841     clip_children_.reset(new std::set<Layer*>);
 842   clip_children_->insert(child);
 843   SetNeedsCommit();
 844 }
 845
 846 void Layer::RemoveClipChild(Layer* child) {
 847   clip_children_->erase(child);
 848   if (clip_children_->empty())
 849     clip_children_ = nullptr;
 850   SetNeedsCommit();
 851 }
 852
 853 void Layer::SetScrollOffset(const gfx::ScrollOffset& scroll_offset) {
 854   DCHECK(IsPropertyChangeAllowed());
 855
 856   if (scroll_offset_ == scroll_offset)
 857     return;
 858   scroll_offset_ = scroll_offset;
 859
 860   if (!layer_tree_host_)
 861     return;
 862
 863   if (TransformNode* transform_node =
 864           layer_tree_host_->property_trees()->transform_tree.Node(
 865               transform_tree_index())) {
 866     if (transform_node->owner_id == id()) {
 867       transform_node->data.scroll_offset = CurrentScrollOffset();
 868       transform_node->data.needs_local_transform_update = true;
 869       layer_tree_host_->property_trees()->transform_tree.set_needs_update(true);
 870       SetNeedsCommitNoRebuild();
 871       return;
 872     }
 873   }
 874
 875   SetNeedsCommit();
 876 }
 877
 878 void Layer::SetScrollCompensationAdjustment(
 879     const gfx::Vector2dF& scroll_compensation_adjustment) {
 880   if (scroll_compensation_adjustment_ == scroll_compensation_adjustment)
 881     return;
 882   scroll_compensation_adjustment_ = scroll_compensation_adjustment;
 883   SetNeedsCommit();
 884 }
 885
 886 gfx::Vector2dF Layer::ScrollCompensationAdjustment() const {
 887   return scroll_compensation_adjustment_;
 888 }
 889
 890 void Layer::SetScrollOffsetFromImplSide(
 891     const gfx::ScrollOffset& scroll_offset) {
 892   DCHECK(IsPropertyChangeAllowed());
 893   // This function only gets called during a BeginMainFrame, so there
 894   // is no need to call SetNeedsUpdate here.
 895   DCHECK(layer_tree_host_ && layer_tree_host_->CommitRequested());
 896   if (scroll_offset_ == scroll_offset)
 897     return;
 898   scroll_offset_ = scroll_offset;
 899   SetNeedsPushProperties();
 900
 901   bool needs_rebuild = true;
 902   if (TransformNode* transform_node =
 903           layer_tree_host_->property_trees()->transform_tree.Node(
 904               transform_tree_index())) {
 905     if (transform_node->owner_id == id()) {
 906       transform_node->data.scroll_offset = CurrentScrollOffset();
 907       transform_node->data.needs_local_transform_update = true;
 908       layer_tree_host_->property_trees()->transform_tree.set_needs_update(true);
 909       needs_rebuild = false;
 910     }
 911   }
 912
 913   if (needs_rebuild)
 914     layer_tree_host_->property_trees()->needs_rebuild = true;
 915
 916   if (!did_scroll_callback_.is_null())
 917     did_scroll_callback_.Run();
 918   // The callback could potentially change the layer structure:
 919   // "this" may have been destroyed during the process.
 920 }
 921
 922 void Layer::SetScrollClipLayerId(int clip_layer_id) {
 923   DCHECK(IsPropertyChangeAllowed());
 924   if (scroll_clip_layer_id_ == clip_layer_id)
 925     return;
 926   scroll_clip_layer_id_ = clip_layer_id;
 927   SetNeedsCommit();
 928 }
 929
 930 void Layer::SetUserScrollable(bool horizontal, bool vertical) {
 931   DCHECK(IsPropertyChangeAllowed());
 932   if (user_scrollable_horizontal_ == horizontal &&
 933       user_scrollable_vertical_ == vertical)
 934     return;
 935   user_scrollable_horizontal_ = horizontal;
 936   user_scrollable_vertical_ = vertical;
 937   SetNeedsCommit();
 938 }
 939
 940 void Layer::SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 941   DCHECK(IsPropertyChangeAllowed());
 942   if (should_scroll_on_main_thread_ == should_scroll_on_main_thread)
 943     return;
 944   should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 945   SetNeedsCommit();
 946 }
 947
 948 void Layer::SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 949   DCHECK(IsPropertyChangeAllowed());
 950   if (have_wheel_event_handlers_ == have_wheel_event_handlers)
 951     return;
 952   if (touch_event_handler_region_.IsEmpty() && layer_tree_host_ &&
 953       !layer_tree_host_->needs_meta_info_recomputation())
 954     UpdateNumInputHandlersForSubtree(have_wheel_event_handlers);
 955
 956   have_wheel_event_handlers_ = have_wheel_event_handlers;
 957   SetNeedsCommit();
 958 }
 959
 960 void Layer::UpdateNumInputHandlersForSubtree(bool add) {
 961   int change = add ? 1 : -1;
 962   for (Layer* layer = this; layer; layer = layer->parent()) {
 963     layer->num_layer_or_descendants_with_input_handler_ += change;
 964     layer->draw_properties().layer_or_descendant_has_input_handler =
 965         (layer->num_layer_or_descendants_with_input_handler_ != 0);
 966     DCHECK_GE(layer->num_layer_or_descendants_with_input_handler_, 0);
 967   }
 968 }
 969
 970 void Layer::SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
 971   DCHECK(IsPropertyChangeAllowed());
 972   if (have_scroll_event_handlers_ == have_scroll_event_handlers)
 973     return;
 974   have_scroll_event_handlers_ = have_scroll_event_handlers;
 975   SetNeedsCommit();
 976 }
 977
 978 void Layer::SetNonFastScrollableRegion(const Region& region) {
 979   DCHECK(IsPropertyChangeAllowed());
 980   if (non_fast_scrollable_region_ == region)
 981     return;
 982   non_fast_scrollable_region_ = region;
 983   SetNeedsCommit();
 984 }
 985
 986 void Layer::SetTouchEventHandlerRegion(const Region& region) {
 987   DCHECK(IsPropertyChangeAllowed());
 988   if (touch_event_handler_region_ == region)
 989     return;
 990   if (!have_wheel_event_handlers_ && layer_tree_host_ &&
 991       !layer_tree_host_->needs_meta_info_recomputation())
 992     UpdateNumInputHandlersForSubtree(!region.IsEmpty());
 993
 994   touch_event_handler_region_ = region;
 995   SetNeedsCommit();
 996 }
 997
 998 void Layer::SetScrollBlocksOn(ScrollBlocksOn scroll_blocks_on) {
 999   DCHECK(IsPropertyChangeAllowed());
1000   if (scroll_blocks_on_ == scroll_blocks_on)
1001     return;
1002   scroll_blocks_on_ = scroll_blocks_on;
1003   SetNeedsCommit();
1004 }
1005
1006 void Layer::SetForceRenderSurface(bool force) {
1007   DCHECK(IsPropertyChangeAllowed());
1008   if (force_render_surface_ == force)
1009     return;
1010   force_render_surface_ = force;
1011   SetNeedsCommit();
1012 }
1013
1014 void Layer::SetDoubleSided(bool double_sided) {
1015   DCHECK(IsPropertyChangeAllowed());
1016   if (double_sided_ == double_sided)
1017     return;
1018   double_sided_ = double_sided;
1019   SetNeedsCommit();
1020 }
1021
1022 void Layer::Set3dSortingContextId(int id) {
1023   DCHECK(IsPropertyChangeAllowed());
1024   if (id == sorting_context_id_)
1025     return;
1026   sorting_context_id_ = id;
1027   SetNeedsCommit();
1028 }
1029
1030 void Layer::SetTransformTreeIndex(int index) {
1031   DCHECK(IsPropertyChangeAllowed());
1032   if (transform_tree_index_ == index)
1033     return;
1034   transform_tree_index_ = index;
1035   SetNeedsPushProperties();
1036 }
1037
1038 int Layer::transform_tree_index() const {
1039   if (!layer_tree_host_ ||
1040       layer_tree_host_->property_trees()->sequence_number !=
1041           property_tree_sequence_number_) {
1042     return -1;
1043   }
1044   return transform_tree_index_;
1045 }
1046
1047 void Layer::SetClipTreeIndex(int index) {
1048   DCHECK(IsPropertyChangeAllowed());
1049   if (clip_tree_index_ == index)
1050     return;
1051   clip_tree_index_ = index;
1052   SetNeedsPushProperties();
1053 }
1054
1055 int Layer::clip_tree_index() const {
1056   if (!layer_tree_host_ ||
1057       layer_tree_host_->property_trees()->sequence_number !=
1058           property_tree_sequence_number_) {
1059     return -1;
1060   }
1061   return clip_tree_index_;
1062 }
1063
1064 void Layer::SetEffectTreeIndex(int index) {
1065   DCHECK(IsPropertyChangeAllowed());
1066   if (effect_tree_index_ == index)
1067     return;
1068   effect_tree_index_ = index;
1069   SetNeedsPushProperties();
1070 }
1071
1072 int Layer::effect_tree_index() const {
1073   if (!layer_tree_host_ ||
1074       layer_tree_host_->property_trees()->sequence_number !=
1075           property_tree_sequence_number_) {
1076     return -1;
1077   }
1078   return effect_tree_index_;
1079 }
1080
1081 void Layer::InvalidatePropertyTreesIndices() {
1082   int invalid_property_tree_index = -1;
1083   SetTransformTreeIndex(invalid_property_tree_index);
1084   SetClipTreeIndex(invalid_property_tree_index);
1085   SetEffectTreeIndex(invalid_property_tree_index);
1086 }
1087
1088 void Layer::SetShouldFlattenTransform(bool should_flatten) {
1089   DCHECK(IsPropertyChangeAllowed());
1090   if (should_flatten_transform_ == should_flatten)
1091     return;
1092   should_flatten_transform_ = should_flatten;
1093   SetNeedsCommit();
1094 }
1095
1096 void Layer::SetIsDrawable(bool is_drawable) {
1097   DCHECK(IsPropertyChangeAllowed());
1098   if (is_drawable_ == is_drawable)
1099     return;
1100
1101   is_drawable_ = is_drawable;
1102   UpdateDrawsContent(HasDrawableContent());
1103 }
1104
1105 void Layer::SetHideLayerAndSubtree(bool hide) {
1106   DCHECK(IsPropertyChangeAllowed());
1107   if (hide_layer_and_subtree_ == hide)
1108     return;
1109
1110   hide_layer_and_subtree_ = hide;
1111   SetNeedsCommit();
1112 }
1113
1114 void Layer::SetNeedsDisplayRect(const gfx::Rect& dirty_rect) {
1115   if (dirty_rect.IsEmpty())
1116     return;
1117
1118   SetNeedsPushProperties();
1119   update_rect_.Union(dirty_rect);
1120
1121   if (DrawsContent())
1122     SetNeedsUpdate();
1123 }
1124
1125 bool Layer::DescendantIsFixedToContainerLayer() const {
1126   for (size_t i = 0; i < children_.size(); ++i) {
1127     if (children_[i]->position_constraint_.is_fixed_position() ||
1128         children_[i]->DescendantIsFixedToContainerLayer())
1129       return true;
1130   }
1131   return false;
1132 }
1133
1134 void Layer::SetIsContainerForFixedPositionLayers(bool container) {
1135   if (is_container_for_fixed_position_layers_ == container)
1136     return;
1137   is_container_for_fixed_position_layers_ = container;
1138
1139   if (layer_tree_host_ && layer_tree_host_->CommitRequested())
1140     return;
1141
1142   // Only request a commit if we have a fixed positioned descendant.
1143   if (DescendantIsFixedToContainerLayer())
1144     SetNeedsCommit();
1145 }
1146
1147 void Layer::SetPositionConstraint(const LayerPositionConstraint& constraint) {
1148   DCHECK(IsPropertyChangeAllowed());
1149   if (position_constraint_ == constraint)
1150     return;
1151   position_constraint_ = constraint;
1152   SetNeedsCommit();
1153 }
1154
1155 static void RunCopyCallbackOnMainThread(scoped_ptr<CopyOutputRequest> request,
1156                                         scoped_ptr<CopyOutputResult> result) {
1157   request->SendResult(result.Pass());
1158 }
1159
1160 static void PostCopyCallbackToMainThread(
1161     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner,
1162     scoped_ptr<CopyOutputRequest> request,
1163     scoped_ptr<CopyOutputResult> result) {
1164   main_thread_task_runner->PostTask(FROM_HERE,
1165                                     base::Bind(&RunCopyCallbackOnMainThread,
1166                                                base::Passed(&request),
1167                                                base::Passed(&result)));
1168 }
1169
1170 void Layer::PushPropertiesTo(LayerImpl* layer) {
1171   DCHECK(layer_tree_host_);
1172
1173   // If we did not SavePaintProperties() for the layer this frame, then push the
1174   // real property values, not the paint property values.
1175   bool use_paint_properties = paint_properties_.source_frame_number ==
1176                               layer_tree_host_->source_frame_number();
1177
1178   layer->SetTransformOrigin(transform_origin_);
1179   layer->SetBackgroundColor(background_color_);
1180   layer->SetBounds(use_paint_properties ? paint_properties_.bounds
1181                                         : bounds_);
1182
1183   if (frame_viewer_instrumentation::IsTracingLayerTreeSnapshots())
1184     layer->SetDebugInfo(TakeDebugInfo());
1185
1186   layer->SetTransformTreeIndex(transform_tree_index());
1187   layer->SetEffectTreeIndex(effect_tree_index());
1188   layer->SetClipTreeIndex(clip_tree_index());
1189   layer->set_offset_to_transform_parent(offset_to_transform_parent_);
1190   layer->SetDoubleSided(double_sided_);
1191   layer->SetDrawsContent(DrawsContent());
1192   layer->SetHideLayerAndSubtree(hide_layer_and_subtree_);
1193   layer->SetHasRenderSurface(has_render_surface_);
1194   if (!layer->FilterIsAnimatingOnImplOnly() && !FilterIsAnimating())
1195     layer->SetFilters(filters_);
1196   DCHECK(!(FilterIsAnimating() && layer->FilterIsAnimatingOnImplOnly()));
1197   layer->SetBackgroundFilters(background_filters());
1198   layer->SetMasksToBounds(masks_to_bounds_);
1199   layer->SetShouldScrollOnMainThread(should_scroll_on_main_thread_);
1200   layer->SetHaveWheelEventHandlers(have_wheel_event_handlers_);
1201   layer->SetHaveScrollEventHandlers(have_scroll_event_handlers_);
1202   layer->SetNonFastScrollableRegion(non_fast_scrollable_region_);
1203   layer->SetTouchEventHandlerRegion(touch_event_handler_region_);
1204   layer->SetScrollBlocksOn(scroll_blocks_on_);
1205   layer->SetContentsOpaque(contents_opaque_);
1206   if (!layer->OpacityIsAnimatingOnImplOnly() && !OpacityIsAnimating())
1207     layer->SetOpacity(opacity_);
1208   DCHECK(!(OpacityIsAnimating() && layer->OpacityIsAnimatingOnImplOnly()));
1209   layer->SetBlendMode(blend_mode_);
1210   layer->SetIsRootForIsolatedGroup(is_root_for_isolated_group_);
1211   layer->SetPosition(position_);
1212   layer->SetIsContainerForFixedPositionLayers(
1213       IsContainerForFixedPositionLayers());
1214   layer->SetPositionConstraint(position_constraint_);
1215   layer->SetShouldFlattenTransform(should_flatten_transform_);
1216   layer->set_should_flatten_transform_from_property_tree(
1217       should_flatten_transform_from_property_tree_);
1218   layer->set_is_clipped(is_clipped_);
1219   layer->set_draw_blend_mode(draw_blend_mode_);
1220   layer->SetUseParentBackfaceVisibility(use_parent_backface_visibility_);
1221   if (!layer->TransformIsAnimatingOnImplOnly() && !TransformIsAnimating())
1222     layer->SetTransformAndInvertibility(transform_, transform_is_invertible_);
1223   DCHECK(!(TransformIsAnimating() && layer->TransformIsAnimatingOnImplOnly()));
1224   layer->Set3dSortingContextId(sorting_context_id_);
1225   layer->SetNumDescendantsThatDrawContent(num_descendants_that_draw_content_);
1226
1227   layer->SetScrollClipLayer(scroll_clip_layer_id_);
1228   layer->set_user_scrollable_horizontal(user_scrollable_horizontal_);
1229   layer->set_user_scrollable_vertical(user_scrollable_vertical_);
1230
1231   LayerImpl* scroll_parent = nullptr;
1232   if (scroll_parent_) {
1233     scroll_parent = layer->layer_tree_impl()->LayerById(scroll_parent_->id());
1234     DCHECK(scroll_parent);
1235   }
1236
1237   layer->SetScrollParent(scroll_parent);
1238   if (scroll_children_) {
1239     std::set<LayerImpl*>* scroll_children = new std::set<LayerImpl*>;
1240     for (std::set<Layer*>::iterator it = scroll_children_->begin();
1241          it != scroll_children_->end();
1242          ++it) {
1243       DCHECK_EQ((*it)->scroll_parent(), this);
1244       LayerImpl* scroll_child =
1245           layer->layer_tree_impl()->LayerById((*it)->id());
1246       DCHECK(scroll_child);
1247       scroll_children->insert(scroll_child);
1248     }
1249     layer->SetScrollChildren(scroll_children);
1250   } else {
1251     layer->SetScrollChildren(nullptr);
1252   }
1253
1254   LayerImpl* clip_parent = nullptr;
1255   if (clip_parent_) {
1256     clip_parent =
1257         layer->layer_tree_impl()->LayerById(clip_parent_->id());
1258     DCHECK(clip_parent);
1259   }
1260
1261   layer->SetClipParent(clip_parent);
1262   if (clip_children_) {
1263     std::set<LayerImpl*>* clip_children = new std::set<LayerImpl*>;
1264     for (std::set<Layer*>::iterator it = clip_children_->begin();
1265         it != clip_children_->end(); ++it) {
1266       DCHECK_EQ((*it)->clip_parent(), this);
1267       LayerImpl* clip_child = layer->layer_tree_impl()->LayerById((*it)->id());
1268       DCHECK(clip_child);
1269       clip_children->insert(clip_child);
1270     }
1271     layer->SetClipChildren(clip_children);
1272   } else {
1273     layer->SetClipChildren(nullptr);
1274   }
1275
1276   // When a scroll offset animation is interrupted the new scroll position on
1277   // the pending tree will clobber any impl-side scrolling occuring on the
1278   // active tree. To do so, avoid scrolling the pending tree along with it
1279   // instead of trying to undo that scrolling later.
1280   if (ScrollOffsetAnimationWasInterrupted())
1281     layer->PushScrollOffsetFromMainThreadAndClobberActiveValue(scroll_offset_);
1282   else
1283     layer->PushScrollOffsetFromMainThread(scroll_offset_);
1284   layer->SetScrollCompensationAdjustment(ScrollCompensationAdjustment());
1285
1286   // Wrap the copy_requests_ in a PostTask to the main thread.
1287   bool had_copy_requests = !copy_requests_.empty();
1288   ScopedPtrVector<CopyOutputRequest> main_thread_copy_requests;
1289   for (ScopedPtrVector<CopyOutputRequest>::iterator it = copy_requests_.begin();
1290        it != copy_requests_.end();
1291        ++it) {
1292     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner =
1293         layer_tree_host()->proxy()->MainThreadTaskRunner();
1294     scoped_ptr<CopyOutputRequest> original_request = copy_requests_.take(it);
1295     const CopyOutputRequest& original_request_ref = *original_request;
1296     scoped_ptr<CopyOutputRequest> main_thread_request =
1297         CopyOutputRequest::CreateRelayRequest(
1298             original_request_ref,
1299             base::Bind(&PostCopyCallbackToMainThread,
1300                        main_thread_task_runner,
1301                        base::Passed(&original_request)));
1302     main_thread_copy_requests.push_back(main_thread_request.Pass());
1303   }
1304   if (!copy_requests_.empty() && layer_tree_host_)
1305     layer_tree_host_->property_trees()->needs_rebuild = true;
1306   if (had_copy_requests)
1307     UpdateNumCopyRequestsForSubtree(false);
1308   copy_requests_.clear();
1309   layer->PassCopyRequests(&main_thread_copy_requests);
1310
1311   // If the main thread commits multiple times before the impl thread actually
1312   // draws, then damage tracking will become incorrect if we simply clobber the
1313   // update_rect here. The LayerImpl's update_rect needs to accumulate (i.e.
1314   // union) any update changes that have occurred on the main thread.
1315   update_rect_.Union(layer->update_rect());
1316   layer->SetUpdateRect(update_rect_);
1317
1318   layer->SetStackingOrderChanged(stacking_order_changed_);
1319
1320   if (layer->layer_animation_controller() && layer_animation_controller_)
1321     layer_animation_controller_->PushAnimationUpdatesTo(
1322         layer->layer_animation_controller());
1323
1324   if (frame_timing_requests_dirty_) {
1325     layer->SetFrameTimingRequests(frame_timing_requests_);
1326     frame_timing_requests_dirty_ = false;
1327   }
1328
1329   bool is_page_scale_layer = this == layer_tree_host()->page_scale_layer();
1330   bool parent_affected =
1331       layer->parent() && layer->parent()->IsAffectedByPageScale();
1332   layer->SetIsAffectedByPageScale(is_page_scale_layer || parent_affected);
1333
1334   // Reset any state that should be cleared for the next update.
1335   stacking_order_changed_ = false;
1336   update_rect_ = gfx::Rect();
1337
1338   needs_push_properties_ = false;
1339   num_dependents_need_push_properties_ = 0;
1340 }
1341
1342 scoped_ptr<LayerImpl> Layer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
1343   return LayerImpl::Create(tree_impl, layer_id_,
1344                            new LayerImpl::SyncedScrollOffset);
1345 }
1346
1347 bool Layer::DrawsContent() const {
1348   return draws_content_;
1349 }
1350
1351 bool Layer::HasDrawableContent() const {
1352   return is_drawable_;
1353 }
1354
1355 void Layer::UpdateDrawsContent(bool has_drawable_content) {
1356   bool draws_content = has_drawable_content;
1357   DCHECK(is_drawable_ || !has_drawable_content);
1358   if (draws_content == draws_content_)
1359     return;
1360
1361   if (HasDelegatedContent()) {
1362     // Layers with delegated content need to be treated as if they have as
1363     // many children as the number of layers they own delegated quads for.
1364     // Since we don't know this number right now, we choose one that acts like
1365     // infinity for our purposes.
1366     AddDrawableDescendants(draws_content ? 1000 : -1000);
1367   }
1368
1369   if (parent())
1370     parent()->AddDrawableDescendants(draws_content ? 1 : -1);
1371
1372   draws_content_ = draws_content;
1373   SetNeedsCommit();
1374 }
1375
1376 int Layer::NumDescendantsThatDrawContent() const {
1377   return num_descendants_that_draw_content_;
1378 }
1379
1380 void Layer::SavePaintProperties() {
1381   DCHECK(layer_tree_host_);
1382
1383   // TODO(reveman): Save all layer properties that we depend on not
1384   // changing until PushProperties() has been called. crbug.com/231016
1385   paint_properties_.bounds = bounds_;
1386   paint_properties_.source_frame_number =
1387       layer_tree_host_->source_frame_number();
1388 }
1389
1390 bool Layer::Update() {
1391   DCHECK(layer_tree_host_);
1392   DCHECK_EQ(layer_tree_host_->source_frame_number(),
1393             paint_properties_.source_frame_number) <<
1394       "SavePaintProperties must be called for any layer that is painted.";
1395   return false;
1396 }
1397
1398 bool Layer::NeedMoreUpdates() {
1399   return false;
1400 }
1401
1402 bool Layer::IsSuitableForGpuRasterization() const {
1403   return true;
1404 }
1405
1406 scoped_refptr<base::trace_event::ConvertableToTraceFormat>
1407 Layer::TakeDebugInfo() {
1408   if (client_)
1409     return client_->TakeDebugInfo();
1410   else
1411     return nullptr;
1412 }
1413
1414 void Layer::SetHasRenderSurface(bool has_render_surface) {
1415   if (has_render_surface_ == has_render_surface)
1416     return;
1417   has_render_surface_ = has_render_surface;
1418   // We do not need SetNeedsCommit here, since this is only ever called
1419   // during a commit, from CalculateDrawProperties.
1420   SetNeedsPushProperties();
1421   layer_tree_host_->property_trees()->needs_rebuild = true;
1422 }
1423
1424 void Layer::CreateRenderSurface() {
1425   DCHECK(!render_surface_);
1426   render_surface_ = make_scoped_ptr(new RenderSurface(this));
1427 }
1428
1429 void Layer::ClearRenderSurface() {
1430   render_surface_ = nullptr;
1431 }
1432
1433 void Layer::ClearRenderSurfaceLayerList() {
1434   if (render_surface_)
1435     render_surface_->ClearLayerLists();
1436 }
1437
1438 gfx::ScrollOffset Layer::ScrollOffsetForAnimation() const {
1439   return CurrentScrollOffset();
1440 }
1441
1442 // On<Property>Animated is called due to an ongoing accelerated animation.
1443 // Since this animation is also being run on the compositor thread, there
1444 // is no need to request a commit to push this value over, so the value is
1445 // set directly rather than by calling Set<Property>.
1446 void Layer::OnFilterAnimated(const FilterOperations& filters) {
1447   filters_ = filters;
1448 }
1449
1450 void Layer::OnOpacityAnimated(float opacity) {
1451   opacity_ = opacity;
1452   if (layer_tree_host_) {
1453     if (EffectNode* node = layer_tree_host_->property_trees()->effect_tree.Node(
1454             effect_tree_index())) {
1455       if (node->owner_id == id()) {
1456         node->data.opacity = opacity;
1457         layer_tree_host_->property_trees()->effect_tree.set_needs_update(true);
1458       }
1459     }
1460   }
1461 }
1462
1463 void Layer::OnTransformAnimated(const gfx::Transform& transform) {
1464   if (transform_ == transform)
1465     return;
1466   transform_ = transform;
1467   transform_is_invertible_ = transform.IsInvertible();
1468   if (layer_tree_host_) {
1469     if (TransformNode* node =
1470             layer_tree_host_->property_trees()->transform_tree.Node(
1471                 transform_tree_index())) {
1472       if (node->owner_id == id()) {
1473         node->data.local = transform;
1474         node->data.needs_local_transform_update = true;
1475         node->data.is_animated = true;
1476         layer_tree_host_->property_trees()->transform_tree.set_needs_update(
1477             true);
1478       }
1479     }
1480   }
1481 }
1482
1483 void Layer::OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) {
1484   // Do nothing. Scroll deltas will be sent from the compositor thread back
1485   // to the main thread in the same manner as during non-animated
1486   // compositor-driven scrolling.
1487 }
1488
1489 void Layer::OnAnimationWaitingForDeletion() {
1490   // Animations are only deleted during PushProperties.
1491   SetNeedsPushProperties();
1492 }
1493
1494 void Layer::OnTransformIsPotentiallyAnimatingChanged(bool is_animating) {
1495   if (!layer_tree_host_)
1496     return;
1497   TransformTree& transform_tree =
1498       layer_tree_host_->property_trees()->transform_tree;
1499   TransformNode* node = transform_tree.Node(transform_tree_index());
1500   if (!node)
1501     return;
1502
1503   if (node->owner_id == id()) {
1504     node->data.is_animated = is_animating;
1505     transform_tree.set_needs_update(true);
1506   }
1507 }
1508
1509 bool Layer::IsActive() const {
1510   return true;
1511 }
1512
1513 bool Layer::AddAnimation(scoped_ptr <Animation> animation) {
1514   DCHECK(layer_animation_controller_);
1515   if (!layer_animation_controller_->animation_registrar())
1516     return false;
1517
1518   if (animation->target_property() == Animation::SCROLL_OFFSET &&
1519       !layer_animation_controller_->animation_registrar()
1520            ->supports_scroll_animations())
1521     return false;
1522
1523   UMA_HISTOGRAM_BOOLEAN("Renderer.AnimationAddedToOrphanLayer",
1524                         !layer_tree_host_);
1525   layer_animation_controller_->AddAnimation(animation.Pass());
1526   SetNeedsCommit();
1527   return true;
1528 }
1529
1530 void Layer::PauseAnimation(int animation_id, double time_offset) {
1531   DCHECK(layer_animation_controller_);
1532   layer_animation_controller_->PauseAnimation(
1533       animation_id, base::TimeDelta::FromSecondsD(time_offset));
1534   SetNeedsCommit();
1535 }
1536
1537 void Layer::RemoveAnimation(int animation_id) {
1538   DCHECK(layer_animation_controller_);
1539   layer_animation_controller_->RemoveAnimation(animation_id);
1540   SetNeedsCommit();
1541 }
1542
1543 void Layer::RemoveAnimation(int animation_id,
1544                             Animation::TargetProperty property) {
1545   DCHECK(layer_animation_controller_);
1546   layer_animation_controller_->RemoveAnimation(animation_id, property);
1547   SetNeedsCommit();
1548 }
1549
1550 void Layer::SetLayerAnimationControllerForTest(
1551     scoped_refptr<LayerAnimationController> controller) {
1552   DCHECK(layer_animation_controller_);
1553   layer_animation_controller_->RemoveValueObserver(this);
1554   layer_animation_controller_ = controller;
1555   layer_animation_controller_->AddValueObserver(this);
1556   SetNeedsCommit();
1557 }
1558
1559 bool Layer::HasActiveAnimation() const {
1560   DCHECK(layer_tree_host_);
1561   return layer_animation_controller_
1562              ? layer_animation_controller_->HasActiveAnimation()
1563              : layer_tree_host_->HasActiveAnimation(this);
1564 }
1565
1566 void Layer::RegisterForAnimations(AnimationRegistrar* registrar) {
1567   if (layer_animation_controller_)
1568     layer_animation_controller_->SetAnimationRegistrar(registrar);
1569 }
1570
1571 void Layer::AddLayerAnimationEventObserver(
1572     LayerAnimationEventObserver* animation_observer) {
1573   DCHECK(layer_animation_controller_);
1574   layer_animation_controller_->AddEventObserver(animation_observer);
1575 }
1576
1577 void Layer::RemoveLayerAnimationEventObserver(
1578     LayerAnimationEventObserver* animation_observer) {
1579   DCHECK(layer_animation_controller_);
1580   layer_animation_controller_->RemoveEventObserver(animation_observer);
1581 }
1582
1583 ScrollbarLayerInterface* Layer::ToScrollbarLayer() {
1584   return nullptr;
1585 }
1586
1587 RenderingStatsInstrumentation* Layer::rendering_stats_instrumentation() const {
1588   return layer_tree_host_->rendering_stats_instrumentation();
1589 }
1590
1591 void Layer::RemoveFromScrollTree() {
1592   if (scroll_children_.get()) {
1593     std::set<Layer*> copy = *scroll_children_;
1594     for (std::set<Layer*>::iterator it = copy.begin(); it != copy.end(); ++it)
1595       (*it)->SetScrollParent(nullptr);
1596   }
1597
1598   DCHECK(!scroll_children_);
1599   SetScrollParent(nullptr);
1600 }
1601
1602 void Layer::RemoveFromClipTree() {
1603   if (clip_children_.get()) {
1604     std::set<Layer*> copy = *clip_children_;
1605     for (std::set<Layer*>::iterator it = copy.begin(); it != copy.end(); ++it)
1606       (*it)->SetClipParent(nullptr);
1607   }
1608
1609   DCHECK(!clip_children_);
1610   SetClipParent(nullptr);
1611 }
1612
1613 void Layer::AddDrawableDescendants(int num) {
1614   DCHECK_GE(num_descendants_that_draw_content_, 0);
1615   DCHECK_GE(num_descendants_that_draw_content_ + num, 0);
1616   if (num == 0)
1617     return;
1618   num_descendants_that_draw_content_ += num;
1619   SetNeedsCommit();
1620   if (parent())
1621     parent()->AddDrawableDescendants(num);
1622 }
1623
1624 void Layer::RunMicroBenchmark(MicroBenchmark* benchmark) {
1625   benchmark->RunOnLayer(this);
1626 }
1627
1628 bool Layer::HasDelegatedContent() const {
1629   return false;
1630 }
1631
1632 void Layer::SetFrameTimingRequests(
1633     const std::vector<FrameTimingRequest>& requests) {
1634   // TODO(vmpstr): Early out if there are no changes earlier in the call stack.
1635   if (requests == frame_timing_requests_)
1636     return;
1637   frame_timing_requests_ = requests;
1638   frame_timing_requests_dirty_ = true;
1639   SetNeedsCommit();
1640 }
1641
1642 void Layer::DidBeginTracing() {
1643   // We'll be dumping layer trees as part of trace, so make sure
1644   // PushPropertiesTo() propagates layer debug info to the impl
1645   // side -- otherwise this won't happen for the the layers that
1646   // remain unchanged since tracing started.
1647   SetNeedsPushProperties();
1648 }
1649
1650 void Layer::set_visited(bool visited) {
1651   visited_tracker_ =
1652       visited ? layer_tree_host()->meta_information_sequence_number() : 0;
1653 }
1654
1655 bool Layer::visited() {
1656   return visited_tracker_ ==
1657          layer_tree_host()->meta_information_sequence_number();
1658 }
1659
1660 void Layer::set_layer_or_descendant_is_drawn(
1661     bool layer_or_descendant_is_drawn) {
1662   layer_or_descendant_is_drawn_tracker_ =
1663       layer_or_descendant_is_drawn
1664           ? layer_tree_host()->meta_information_sequence_number()
1665           : 0;
1666 }
1667
1668 bool Layer::layer_or_descendant_is_drawn() {
1669   return layer_or_descendant_is_drawn_tracker_ ==
1670          layer_tree_host()->meta_information_sequence_number();
1671 }
1672
1673 void Layer::set_sorted_for_recursion(bool sorted_for_recursion) {
1674   sorted_for_recursion_tracker_ =
1675       sorted_for_recursion
1676           ? layer_tree_host()->meta_information_sequence_number()
1677           : 0;
1678 }
1679
1680 bool Layer::sorted_for_recursion() {
1681   return sorted_for_recursion_tracker_ ==
1682          layer_tree_host()->meta_information_sequence_number();
1683 }
1684
1685 }  // namespace cc