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