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