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::HasOnlyTranslationTransforms() const {
 765   if (layer_animation_controller_) {
 766     return layer_animation_controller_->HasOnlyTranslationTransforms(
 767         LayerAnimationController::ObserverType::ACTIVE);
 768   }
 769   return layer_tree_host_->HasOnlyTranslationTransforms(this);
 770 }
 771
 772 bool Layer::MaximumTargetScale(float* max_scale) const {
 773   if (layer_animation_controller_) {
 774     return layer_animation_controller_->MaximumTargetScale(
 775         LayerAnimationController::ObserverType::ACTIVE, max_scale);
 776   }
 777   return layer_tree_host_->MaximumTargetScale(this, max_scale);
 778 }
 779
 780 bool Layer::AnimationStartScale(float* start_scale) const {
 781   if (layer_animation_controller_) {
 782     return layer_animation_controller_->AnimationStartScale(
 783         LayerAnimationController::ObserverType::ACTIVE, start_scale);
 784   }
 785   return layer_tree_host_->AnimationStartScale(this, start_scale);
 786 }
 787
 788 bool Layer::HasAnyAnimationTargetingProperty(
 789     Animation::TargetProperty property) const {
 790   if (layer_animation_controller_)
 791     return !!layer_animation_controller_->GetAnimation(property);
 792
 793   return layer_tree_host_->HasAnyAnimationTargetingProperty(this, property);
 794 }
 795
 796 bool Layer::ScrollOffsetAnimationWasInterrupted() const {
 797   DCHECK(layer_tree_host_);
 798   return layer_animation_controller_
 799              ? layer_animation_controller_
 800                    ->scroll_offset_animation_was_interrupted()
 801              : layer_tree_host_->ScrollOffsetAnimationWasInterrupted(this);
 802 }
 803
 804 void Layer::SetScrollParent(Layer* parent) {
 805   DCHECK(IsPropertyChangeAllowed());
 806   if (scroll_parent_ == parent)
 807     return;
 808
 809   if (scroll_parent_)
 810     scroll_parent_->RemoveScrollChild(this);
 811
 812   scroll_parent_ = parent;
 813
 814   if (scroll_parent_)
 815     scroll_parent_->AddScrollChild(this);
 816
 817   SetNeedsCommit();
 818 }
 819
 820 void Layer::AddScrollChild(Layer* child) {
 821   if (!scroll_children_)
 822     scroll_children_.reset(new std::set<Layer*>);
 823   scroll_children_->insert(child);
 824   if (layer_tree_host_ && !layer_tree_host_->needs_meta_info_recomputation()) {
 825     num_children_with_scroll_parent_++;
 826     draw_properties().has_child_with_a_scroll_parent = true;
 827   }
 828   SetNeedsCommit();
 829 }
 830
 831 void Layer::RemoveScrollChild(Layer* child) {
 832   scroll_children_->erase(child);
 833   if (scroll_children_->empty())
 834     scroll_children_ = nullptr;
 835   if (layer_tree_host_ && !layer_tree_host_->needs_meta_info_recomputation()) {
 836     num_children_with_scroll_parent_--;
 837     DCHECK_GE(num_children_with_scroll_parent_, 0);
 838     draw_properties().has_child_with_a_scroll_parent =
 839         (num_children_with_scroll_parent_ != 0);
 840   }
 841   SetNeedsCommit();
 842 }
 843
 844 void Layer::SetClipParent(Layer* ancestor) {
 845   DCHECK(IsPropertyChangeAllowed());
 846   if (clip_parent_ == ancestor)
 847     return;
 848
 849   if (clip_parent_)
 850     clip_parent_->RemoveClipChild(this);
 851
 852   clip_parent_ = ancestor;
 853
 854   if (clip_parent_)
 855     clip_parent_->AddClipChild(this);
 856
 857   SetNeedsCommit();
 858   if (layer_tree_host_)
 859     layer_tree_host_->SetNeedsMetaInfoRecomputation(true);
 860 }
 861
 862 void Layer::AddClipChild(Layer* child) {
 863   if (!clip_children_)
 864     clip_children_.reset(new std::set<Layer*>);
 865   clip_children_->insert(child);
 866   SetNeedsCommit();
 867 }
 868
 869 void Layer::RemoveClipChild(Layer* child) {
 870   clip_children_->erase(child);
 871   if (clip_children_->empty())
 872     clip_children_ = nullptr;
 873   SetNeedsCommit();
 874 }
 875
 876 void Layer::SetScrollOffset(const gfx::ScrollOffset& scroll_offset) {
 877   DCHECK(IsPropertyChangeAllowed());
 878
 879   if (scroll_offset_ == scroll_offset)
 880     return;
 881   scroll_offset_ = scroll_offset;
 882
 883   if (!layer_tree_host_)
 884     return;
 885
 886   if (TransformNode* transform_node =
 887           layer_tree_host_->property_trees()->transform_tree.Node(
 888               transform_tree_index())) {
 889     if (transform_node->owner_id == id()) {
 890       transform_node->data.scroll_offset = CurrentScrollOffset();
 891       transform_node->data.needs_local_transform_update = true;
 892       layer_tree_host_->property_trees()->transform_tree.set_needs_update(true);
 893       SetNeedsCommitNoRebuild();
 894       return;
 895     }
 896   }
 897
 898   SetNeedsCommit();
 899 }
 900
 901 void Layer::SetScrollCompensationAdjustment(
 902     const gfx::Vector2dF& scroll_compensation_adjustment) {
 903   if (scroll_compensation_adjustment_ == scroll_compensation_adjustment)
 904     return;
 905   scroll_compensation_adjustment_ = scroll_compensation_adjustment;
 906   SetNeedsCommit();
 907 }
 908
 909 gfx::Vector2dF Layer::ScrollCompensationAdjustment() const {
 910   return scroll_compensation_adjustment_;
 911 }
 912
 913 void Layer::SetScrollOffsetFromImplSide(
 914     const gfx::ScrollOffset& scroll_offset) {
 915   DCHECK(IsPropertyChangeAllowed());
 916   // This function only gets called during a BeginMainFrame, so there
 917   // is no need to call SetNeedsUpdate here.
 918   DCHECK(layer_tree_host_ && layer_tree_host_->CommitRequested());
 919   if (scroll_offset_ == scroll_offset)
 920     return;
 921   scroll_offset_ = scroll_offset;
 922   SetNeedsPushProperties();
 923
 924   bool needs_rebuild = true;
 925   if (TransformNode* transform_node =
 926           layer_tree_host_->property_trees()->transform_tree.Node(
 927               transform_tree_index())) {
 928     if (transform_node->owner_id == id()) {
 929       transform_node->data.scroll_offset = CurrentScrollOffset();
 930       transform_node->data.needs_local_transform_update = true;
 931       layer_tree_host_->property_trees()->transform_tree.set_needs_update(true);
 932       needs_rebuild = false;
 933     }
 934   }
 935
 936   if (needs_rebuild)
 937     layer_tree_host_->property_trees()->needs_rebuild = true;
 938
 939   if (!did_scroll_callback_.is_null())
 940     did_scroll_callback_.Run();
 941   // The callback could potentially change the layer structure:
 942   // "this" may have been destroyed during the process.
 943 }
 944
 945 void Layer::SetScrollClipLayerId(int clip_layer_id) {
 946   DCHECK(IsPropertyChangeAllowed());
 947   if (scroll_clip_layer_id_ == clip_layer_id)
 948     return;
 949   scroll_clip_layer_id_ = clip_layer_id;
 950   SetNeedsCommit();
 951 }
 952
 953 void Layer::SetUserScrollable(bool horizontal, bool vertical) {
 954   DCHECK(IsPropertyChangeAllowed());
 955   if (user_scrollable_horizontal_ == horizontal &&
 956       user_scrollable_vertical_ == vertical)
 957     return;
 958   user_scrollable_horizontal_ = horizontal;
 959   user_scrollable_vertical_ = vertical;
 960   SetNeedsCommit();
 961 }
 962
 963 void Layer::SetShouldScrollOnMainThread(bool should_scroll_on_main_thread) {
 964   DCHECK(IsPropertyChangeAllowed());
 965   if (should_scroll_on_main_thread_ == should_scroll_on_main_thread)
 966     return;
 967   should_scroll_on_main_thread_ = should_scroll_on_main_thread;
 968   SetNeedsCommit();
 969 }
 970
 971 void Layer::SetHaveWheelEventHandlers(bool have_wheel_event_handlers) {
 972   DCHECK(IsPropertyChangeAllowed());
 973   if (have_wheel_event_handlers_ == have_wheel_event_handlers)
 974     return;
 975
 976   have_wheel_event_handlers_ = have_wheel_event_handlers;
 977   SetNeedsCommit();
 978 }
 979
 980 void Layer::SetHaveScrollEventHandlers(bool have_scroll_event_handlers) {
 981   DCHECK(IsPropertyChangeAllowed());
 982   if (have_scroll_event_handlers_ == have_scroll_event_handlers)
 983     return;
 984   have_scroll_event_handlers_ = have_scroll_event_handlers;
 985   SetNeedsCommit();
 986 }
 987
 988 void Layer::SetNonFastScrollableRegion(const Region& region) {
 989   DCHECK(IsPropertyChangeAllowed());
 990   if (non_fast_scrollable_region_ == region)
 991     return;
 992   non_fast_scrollable_region_ = region;
 993   SetNeedsCommit();
 994 }
 995
 996 void Layer::SetTouchEventHandlerRegion(const Region& region) {
 997   DCHECK(IsPropertyChangeAllowed());
 998   if (touch_event_handler_region_ == region)
 999     return;
1000
1001   touch_event_handler_region_ = region;
1002   SetNeedsCommit();
1003 }
1004
1005 void Layer::SetScrollBlocksOn(ScrollBlocksOn scroll_blocks_on) {
1006   DCHECK(IsPropertyChangeAllowed());
1007   if (scroll_blocks_on_ == scroll_blocks_on)
1008     return;
1009   scroll_blocks_on_ = scroll_blocks_on;
1010   SetNeedsCommit();
1011 }
1012
1013 void Layer::SetForceRenderSurface(bool force) {
1014   DCHECK(IsPropertyChangeAllowed());
1015   if (force_render_surface_ == force)
1016     return;
1017   force_render_surface_ = force;
1018   SetNeedsCommit();
1019 }
1020
1021 void Layer::SetDoubleSided(bool double_sided) {
1022   DCHECK(IsPropertyChangeAllowed());
1023   if (double_sided_ == double_sided)
1024     return;
1025   double_sided_ = double_sided;
1026   SetNeedsCommit();
1027 }
1028
1029 void Layer::Set3dSortingContextId(int id) {
1030   DCHECK(IsPropertyChangeAllowed());
1031   if (id == sorting_context_id_)
1032     return;
1033   sorting_context_id_ = id;
1034   SetNeedsCommit();
1035 }
1036
1037 void Layer::SetTransformTreeIndex(int index) {
1038   DCHECK(IsPropertyChangeAllowed());
1039   if (transform_tree_index_ == index)
1040     return;
1041   transform_tree_index_ = index;
1042   SetNeedsPushProperties();
1043 }
1044
1045 int Layer::transform_tree_index() const {
1046   if (!layer_tree_host_ ||
1047       layer_tree_host_->property_trees()->sequence_number !=
1048           property_tree_sequence_number_) {
1049     return -1;
1050   }
1051   return transform_tree_index_;
1052 }
1053
1054 void Layer::SetClipTreeIndex(int index) {
1055   DCHECK(IsPropertyChangeAllowed());
1056   if (clip_tree_index_ == index)
1057     return;
1058   clip_tree_index_ = index;
1059   SetNeedsPushProperties();
1060 }
1061
1062 int Layer::clip_tree_index() const {
1063   if (!layer_tree_host_ ||
1064       layer_tree_host_->property_trees()->sequence_number !=
1065           property_tree_sequence_number_) {
1066     return -1;
1067   }
1068   return clip_tree_index_;
1069 }
1070
1071 void Layer::SetEffectTreeIndex(int index) {
1072   DCHECK(IsPropertyChangeAllowed());
1073   if (effect_tree_index_ == index)
1074     return;
1075   effect_tree_index_ = index;
1076   SetNeedsPushProperties();
1077 }
1078
1079 int Layer::effect_tree_index() const {
1080   if (!layer_tree_host_ ||
1081       layer_tree_host_->property_trees()->sequence_number !=
1082           property_tree_sequence_number_) {
1083     return -1;
1084   }
1085   return effect_tree_index_;
1086 }
1087
1088 void Layer::InvalidatePropertyTreesIndices() {
1089   int invalid_property_tree_index = -1;
1090   SetTransformTreeIndex(invalid_property_tree_index);
1091   SetClipTreeIndex(invalid_property_tree_index);
1092   SetEffectTreeIndex(invalid_property_tree_index);
1093 }
1094
1095 void Layer::SetShouldFlattenTransform(bool should_flatten) {
1096   DCHECK(IsPropertyChangeAllowed());
1097   if (should_flatten_transform_ == should_flatten)
1098     return;
1099   should_flatten_transform_ = should_flatten;
1100   SetNeedsCommit();
1101 }
1102
1103 void Layer::SetIsDrawable(bool is_drawable) {
1104   DCHECK(IsPropertyChangeAllowed());
1105   if (is_drawable_ == is_drawable)
1106     return;
1107
1108   is_drawable_ = is_drawable;
1109   UpdateDrawsContent(HasDrawableContent());
1110 }
1111
1112 void Layer::SetHideLayerAndSubtree(bool hide) {
1113   DCHECK(IsPropertyChangeAllowed());
1114   if (hide_layer_and_subtree_ == hide)
1115     return;
1116
1117   hide_layer_and_subtree_ = hide;
1118   SetNeedsCommit();
1119 }
1120
1121 void Layer::SetNeedsDisplayRect(const gfx::Rect& dirty_rect) {
1122   if (dirty_rect.IsEmpty())
1123     return;
1124
1125   SetNeedsPushProperties();
1126   update_rect_.Union(dirty_rect);
1127
1128   if (DrawsContent())
1129     SetNeedsUpdate();
1130 }
1131
1132 bool Layer::DescendantIsFixedToContainerLayer() const {
1133   for (size_t i = 0; i < children_.size(); ++i) {
1134     if (children_[i]->position_constraint_.is_fixed_position() ||
1135         children_[i]->DescendantIsFixedToContainerLayer())
1136       return true;
1137   }
1138   return false;
1139 }
1140
1141 void Layer::SetIsContainerForFixedPositionLayers(bool container) {
1142   if (is_container_for_fixed_position_layers_ == container)
1143     return;
1144   is_container_for_fixed_position_layers_ = container;
1145
1146   if (layer_tree_host_ && layer_tree_host_->CommitRequested())
1147     return;
1148
1149   // Only request a commit if we have a fixed positioned descendant.
1150   if (DescendantIsFixedToContainerLayer())
1151     SetNeedsCommit();
1152 }
1153
1154 void Layer::SetPositionConstraint(const LayerPositionConstraint& constraint) {
1155   DCHECK(IsPropertyChangeAllowed());
1156   if (position_constraint_ == constraint)
1157     return;
1158   position_constraint_ = constraint;
1159   SetNeedsCommit();
1160 }
1161
1162 static void RunCopyCallbackOnMainThread(scoped_ptr<CopyOutputRequest> request,
1163                                         scoped_ptr<CopyOutputResult> result) {
1164   request->SendResult(result.Pass());
1165 }
1166
1167 static void PostCopyCallbackToMainThread(
1168     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner,
1169     scoped_ptr<CopyOutputRequest> request,
1170     scoped_ptr<CopyOutputResult> result) {
1171   main_thread_task_runner->PostTask(FROM_HERE,
1172                                     base::Bind(&RunCopyCallbackOnMainThread,
1173                                                base::Passed(&request),
1174                                                base::Passed(&result)));
1175 }
1176
1177 void Layer::PushPropertiesTo(LayerImpl* layer) {
1178   DCHECK(layer_tree_host_);
1179
1180   // If we did not SavePaintProperties() for the layer this frame, then push the
1181   // real property values, not the paint property values.
1182   bool use_paint_properties = paint_properties_.source_frame_number ==
1183                               layer_tree_host_->source_frame_number();
1184
1185   layer->SetTransformOrigin(transform_origin_);
1186   layer->SetBackgroundColor(background_color_);
1187   layer->SetBounds(use_paint_properties ? paint_properties_.bounds
1188                                         : bounds_);
1189
1190   if (frame_viewer_instrumentation::IsTracingLayerTreeSnapshots())
1191     layer->SetDebugInfo(TakeDebugInfo());
1192
1193   layer->SetTransformTreeIndex(transform_tree_index());
1194   layer->SetEffectTreeIndex(effect_tree_index());
1195   layer->SetClipTreeIndex(clip_tree_index());
1196   layer->set_offset_to_transform_parent(offset_to_transform_parent_);
1197   layer->SetDoubleSided(double_sided_);
1198   layer->SetDrawsContent(DrawsContent());
1199   layer->SetHideLayerAndSubtree(hide_layer_and_subtree_);
1200   layer->SetHasRenderSurface(has_render_surface_);
1201   if (!layer->FilterIsAnimatingOnImplOnly() && !FilterIsAnimating())
1202     layer->SetFilters(filters_);
1203   DCHECK(!(FilterIsAnimating() && layer->FilterIsAnimatingOnImplOnly()));
1204   layer->SetBackgroundFilters(background_filters());
1205   layer->SetMasksToBounds(masks_to_bounds_);
1206   layer->SetShouldScrollOnMainThread(should_scroll_on_main_thread_);
1207   layer->SetHaveWheelEventHandlers(have_wheel_event_handlers_);
1208   layer->SetHaveScrollEventHandlers(have_scroll_event_handlers_);
1209   layer->SetNonFastScrollableRegion(non_fast_scrollable_region_);
1210   layer->SetTouchEventHandlerRegion(touch_event_handler_region_);
1211   layer->SetScrollBlocksOn(scroll_blocks_on_);
1212   layer->SetContentsOpaque(contents_opaque_);
1213   if (!layer->OpacityIsAnimatingOnImplOnly() && !OpacityIsAnimating())
1214     layer->SetOpacity(opacity_);
1215   DCHECK(!(OpacityIsAnimating() && layer->OpacityIsAnimatingOnImplOnly()));
1216   layer->SetBlendMode(blend_mode_);
1217   layer->SetIsRootForIsolatedGroup(is_root_for_isolated_group_);
1218   layer->SetPosition(position_);
1219   layer->SetIsContainerForFixedPositionLayers(
1220       IsContainerForFixedPositionLayers());
1221   layer->SetPositionConstraint(position_constraint_);
1222   layer->SetShouldFlattenTransform(should_flatten_transform_);
1223   layer->set_should_flatten_transform_from_property_tree(
1224       should_flatten_transform_from_property_tree_);
1225   layer->set_is_clipped(is_clipped_);
1226   layer->set_draw_blend_mode(draw_blend_mode_);
1227   layer->SetUseParentBackfaceVisibility(use_parent_backface_visibility_);
1228   if (!layer->TransformIsAnimatingOnImplOnly() && !TransformIsAnimating())
1229     layer->SetTransformAndInvertibility(transform_, transform_is_invertible_);
1230   DCHECK(!(TransformIsAnimating() && layer->TransformIsAnimatingOnImplOnly()));
1231   layer->Set3dSortingContextId(sorting_context_id_);
1232   layer->SetNumDescendantsThatDrawContent(num_descendants_that_draw_content_);
1233
1234   layer->SetScrollClipLayer(scroll_clip_layer_id_);
1235   layer->set_user_scrollable_horizontal(user_scrollable_horizontal_);
1236   layer->set_user_scrollable_vertical(user_scrollable_vertical_);
1237
1238   LayerImpl* scroll_parent = nullptr;
1239   if (scroll_parent_) {
1240     scroll_parent = layer->layer_tree_impl()->LayerById(scroll_parent_->id());
1241     DCHECK(scroll_parent);
1242   }
1243
1244   layer->SetScrollParent(scroll_parent);
1245   if (scroll_children_) {
1246     std::set<LayerImpl*>* scroll_children = new std::set<LayerImpl*>;
1247     for (std::set<Layer*>::iterator it = scroll_children_->begin();
1248          it != scroll_children_->end();
1249          ++it) {
1250       DCHECK_EQ((*it)->scroll_parent(), this);
1251       LayerImpl* scroll_child =
1252           layer->layer_tree_impl()->LayerById((*it)->id());
1253       DCHECK(scroll_child);
1254       scroll_children->insert(scroll_child);
1255     }
1256     layer->SetScrollChildren(scroll_children);
1257   } else {
1258     layer->SetScrollChildren(nullptr);
1259   }
1260
1261   LayerImpl* clip_parent = nullptr;
1262   if (clip_parent_) {
1263     clip_parent =
1264         layer->layer_tree_impl()->LayerById(clip_parent_->id());
1265     DCHECK(clip_parent);
1266   }
1267
1268   layer->SetClipParent(clip_parent);
1269   if (clip_children_) {
1270     std::set<LayerImpl*>* clip_children = new std::set<LayerImpl*>;
1271     for (std::set<Layer*>::iterator it = clip_children_->begin();
1272         it != clip_children_->end(); ++it) {
1273       DCHECK_EQ((*it)->clip_parent(), this);
1274       LayerImpl* clip_child = layer->layer_tree_impl()->LayerById((*it)->id());
1275       DCHECK(clip_child);
1276       clip_children->insert(clip_child);
1277     }
1278     layer->SetClipChildren(clip_children);
1279   } else {
1280     layer->SetClipChildren(nullptr);
1281   }
1282
1283   // When a scroll offset animation is interrupted the new scroll position on
1284   // the pending tree will clobber any impl-side scrolling occuring on the
1285   // active tree. To do so, avoid scrolling the pending tree along with it
1286   // instead of trying to undo that scrolling later.
1287   if (ScrollOffsetAnimationWasInterrupted())
1288     layer->PushScrollOffsetFromMainThreadAndClobberActiveValue(scroll_offset_);
1289   else
1290     layer->PushScrollOffsetFromMainThread(scroll_offset_);
1291   layer->SetScrollCompensationAdjustment(ScrollCompensationAdjustment());
1292
1293   // Wrap the copy_requests_ in a PostTask to the main thread.
1294   bool had_copy_requests = !copy_requests_.empty();
1295   ScopedPtrVector<CopyOutputRequest> main_thread_copy_requests;
1296   for (ScopedPtrVector<CopyOutputRequest>::iterator it = copy_requests_.begin();
1297        it != copy_requests_.end();
1298        ++it) {
1299     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner =
1300         layer_tree_host()->proxy()->MainThreadTaskRunner();
1301     scoped_ptr<CopyOutputRequest> original_request = copy_requests_.take(it);
1302     const CopyOutputRequest& original_request_ref = *original_request;
1303     scoped_ptr<CopyOutputRequest> main_thread_request =
1304         CopyOutputRequest::CreateRelayRequest(
1305             original_request_ref,
1306             base::Bind(&PostCopyCallbackToMainThread,
1307                        main_thread_task_runner,
1308                        base::Passed(&original_request)));
1309     main_thread_copy_requests.push_back(main_thread_request.Pass());
1310   }
1311   if (!copy_requests_.empty() && layer_tree_host_)
1312     layer_tree_host_->property_trees()->needs_rebuild = true;
1313   if (had_copy_requests)
1314     UpdateNumCopyRequestsForSubtree(false);
1315   copy_requests_.clear();
1316   layer->PassCopyRequests(&main_thread_copy_requests);
1317
1318   // If the main thread commits multiple times before the impl thread actually
1319   // draws, then damage tracking will become incorrect if we simply clobber the
1320   // update_rect here. The LayerImpl's update_rect needs to accumulate (i.e.
1321   // union) any update changes that have occurred on the main thread.
1322   update_rect_.Union(layer->update_rect());
1323   layer->SetUpdateRect(update_rect_);
1324
1325   layer->SetStackingOrderChanged(stacking_order_changed_);
1326
1327   if (layer->layer_animation_controller() && layer_animation_controller_)
1328     layer_animation_controller_->PushAnimationUpdatesTo(
1329         layer->layer_animation_controller());
1330
1331   if (frame_timing_requests_dirty_) {
1332     layer->SetFrameTimingRequests(frame_timing_requests_);
1333     frame_timing_requests_dirty_ = false;
1334   }
1335
1336   bool is_page_scale_layer = this == layer_tree_host()->page_scale_layer();
1337   bool parent_affected =
1338       layer->parent() && layer->parent()->IsAffectedByPageScale();
1339   layer->SetIsAffectedByPageScale(is_page_scale_layer || parent_affected);
1340
1341   // Reset any state that should be cleared for the next update.
1342   stacking_order_changed_ = false;
1343   update_rect_ = gfx::Rect();
1344
1345   needs_push_properties_ = false;
1346   num_dependents_need_push_properties_ = 0;
1347 }
1348
1349 scoped_ptr<LayerImpl> Layer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
1350   return LayerImpl::Create(tree_impl, layer_id_,
1351                            new LayerImpl::SyncedScrollOffset);
1352 }
1353
1354 bool Layer::DrawsContent() const {
1355   return draws_content_;
1356 }
1357
1358 bool Layer::HasDrawableContent() const {
1359   return is_drawable_;
1360 }
1361
1362 void Layer::UpdateDrawsContent(bool has_drawable_content) {
1363   bool draws_content = has_drawable_content;
1364   DCHECK(is_drawable_ || !has_drawable_content);
1365   if (draws_content == draws_content_)
1366     return;
1367
1368   if (HasDelegatedContent()) {
1369     // Layers with delegated content need to be treated as if they have as
1370     // many children as the number of layers they own delegated quads for.
1371     // Since we don't know this number right now, we choose one that acts like
1372     // infinity for our purposes.
1373     AddDrawableDescendants(draws_content ? 1000 : -1000);
1374   }
1375
1376   if (parent())
1377     parent()->AddDrawableDescendants(draws_content ? 1 : -1);
1378
1379   draws_content_ = draws_content;
1380   SetNeedsCommit();
1381 }
1382
1383 int Layer::NumDescendantsThatDrawContent() const {
1384   return num_descendants_that_draw_content_;
1385 }
1386
1387 void Layer::SavePaintProperties() {
1388   DCHECK(layer_tree_host_);
1389
1390   // TODO(reveman): Save all layer properties that we depend on not
1391   // changing until PushProperties() has been called. crbug.com/231016
1392   paint_properties_.bounds = bounds_;
1393   paint_properties_.source_frame_number =
1394       layer_tree_host_->source_frame_number();
1395 }
1396
1397 bool Layer::Update() {
1398   DCHECK(layer_tree_host_);
1399   DCHECK_EQ(layer_tree_host_->source_frame_number(),
1400             paint_properties_.source_frame_number) <<
1401       "SavePaintProperties must be called for any layer that is painted.";
1402   return false;
1403 }
1404
1405 bool Layer::IsSuitableForGpuRasterization() const {
1406   return true;
1407 }
1408
1409 scoped_refptr<base::trace_event::ConvertableToTraceFormat>
1410 Layer::TakeDebugInfo() {
1411   if (client_)
1412     return client_->TakeDebugInfo();
1413   else
1414     return nullptr;
1415 }
1416
1417 void Layer::SetHasRenderSurface(bool has_render_surface) {
1418   if (has_render_surface_ == has_render_surface)
1419     return;
1420   has_render_surface_ = has_render_surface;
1421   // We do not need SetNeedsCommit here, since this is only ever called
1422   // during a commit, from CalculateDrawProperties.
1423   SetNeedsPushProperties();
1424   layer_tree_host_->property_trees()->needs_rebuild = true;
1425 }
1426
1427 gfx::ScrollOffset Layer::ScrollOffsetForAnimation() const {
1428   return CurrentScrollOffset();
1429 }
1430
1431 // On<Property>Animated is called due to an ongoing accelerated animation.
1432 // Since this animation is also being run on the compositor thread, there
1433 // is no need to request a commit to push this value over, so the value is
1434 // set directly rather than by calling Set<Property>.
1435 void Layer::OnFilterAnimated(const FilterOperations& filters) {
1436   filters_ = filters;
1437 }
1438
1439 void Layer::OnOpacityAnimated(float opacity) {
1440   opacity_ = opacity;
1441   if (layer_tree_host_) {
1442     if (EffectNode* node = layer_tree_host_->property_trees()->effect_tree.Node(
1443             effect_tree_index())) {
1444       if (node->owner_id == id()) {
1445         node->data.opacity = opacity;
1446         layer_tree_host_->property_trees()->effect_tree.set_needs_update(true);
1447       }
1448     }
1449   }
1450 }
1451
1452 void Layer::OnTransformAnimated(const gfx::Transform& transform) {
1453   if (transform_ == transform)
1454     return;
1455   transform_ = transform;
1456   transform_is_invertible_ = transform.IsInvertible();
1457   if (layer_tree_host_) {
1458     if (TransformNode* node =
1459             layer_tree_host_->property_trees()->transform_tree.Node(
1460                 transform_tree_index())) {
1461       if (node->owner_id == id()) {
1462         node->data.local = transform;
1463         node->data.needs_local_transform_update = true;
1464         node->data.is_animated = true;
1465         layer_tree_host_->property_trees()->transform_tree.set_needs_update(
1466             true);
1467       }
1468     }
1469   }
1470 }
1471
1472 void Layer::OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) {
1473   // Do nothing. Scroll deltas will be sent from the compositor thread back
1474   // to the main thread in the same manner as during non-animated
1475   // compositor-driven scrolling.
1476 }
1477
1478 void Layer::OnAnimationWaitingForDeletion() {
1479   // Animations are only deleted during PushProperties.
1480   SetNeedsPushProperties();
1481 }
1482
1483 void Layer::OnTransformIsPotentiallyAnimatingChanged(bool is_animating) {
1484   if (!layer_tree_host_)
1485     return;
1486   TransformTree& transform_tree =
1487       layer_tree_host_->property_trees()->transform_tree;
1488   TransformNode* node = transform_tree.Node(transform_tree_index());
1489   if (!node)
1490     return;
1491
1492   if (node->owner_id == id()) {
1493     node->data.is_animated = is_animating;
1494     if (is_animating) {
1495       float maximum_target_scale = 0.f;
1496       node->data.local_maximum_animation_target_scale =
1497           MaximumTargetScale(&maximum_target_scale) ? maximum_target_scale
1498                                                     : 0.f;
1499
1500       float animation_start_scale = 0.f;
1501       node->data.local_starting_animation_scale =
1502           AnimationStartScale(&animation_start_scale) ? animation_start_scale
1503                                                       : 0.f;
1504
1505       node->data.has_only_translation_animations =
1506           HasOnlyTranslationTransforms();
1507
1508     } else {
1509       node->data.local_maximum_animation_target_scale = 0.f;
1510       node->data.local_starting_animation_scale = 0.f;
1511       node->data.has_only_translation_animations = true;
1512     }
1513     transform_tree.set_needs_update(true);
1514   }
1515 }
1516
1517 bool Layer::IsActive() const {
1518   return true;
1519 }
1520
1521 bool Layer::AddAnimation(scoped_ptr <Animation> animation) {
1522   DCHECK(layer_animation_controller_);
1523   if (!layer_animation_controller_->animation_registrar())
1524     return false;
1525
1526   if (animation->target_property() == Animation::SCROLL_OFFSET &&
1527       !layer_animation_controller_->animation_registrar()
1528            ->supports_scroll_animations())
1529     return false;
1530
1531   UMA_HISTOGRAM_BOOLEAN("Renderer.AnimationAddedToOrphanLayer",
1532                         !layer_tree_host_);
1533   layer_animation_controller_->AddAnimation(animation.Pass());
1534   SetNeedsCommit();
1535   return true;
1536 }
1537
1538 void Layer::PauseAnimation(int animation_id, double time_offset) {
1539   DCHECK(layer_animation_controller_);
1540   layer_animation_controller_->PauseAnimation(
1541       animation_id, base::TimeDelta::FromSecondsD(time_offset));
1542   SetNeedsCommit();
1543 }
1544
1545 void Layer::RemoveAnimation(int animation_id) {
1546   DCHECK(layer_animation_controller_);
1547   layer_animation_controller_->RemoveAnimation(animation_id);
1548   SetNeedsCommit();
1549 }
1550
1551 void Layer::RemoveAnimation(int animation_id,
1552                             Animation::TargetProperty property) {
1553   DCHECK(layer_animation_controller_);
1554   layer_animation_controller_->RemoveAnimation(animation_id, property);
1555   SetNeedsCommit();
1556 }
1557
1558 void Layer::SetLayerAnimationControllerForTest(
1559     scoped_refptr<LayerAnimationController> controller) {
1560   DCHECK(layer_animation_controller_);
1561   layer_animation_controller_->RemoveValueObserver(this);
1562   layer_animation_controller_ = controller;
1563   layer_animation_controller_->AddValueObserver(this);
1564   SetNeedsCommit();
1565 }
1566
1567 bool Layer::HasActiveAnimation() const {
1568   DCHECK(layer_tree_host_);
1569   return layer_animation_controller_
1570              ? layer_animation_controller_->HasActiveAnimation()
1571              : layer_tree_host_->HasActiveAnimation(this);
1572 }
1573
1574 void Layer::RegisterForAnimations(AnimationRegistrar* registrar) {
1575   if (layer_animation_controller_)
1576     layer_animation_controller_->SetAnimationRegistrar(registrar);
1577 }
1578
1579 void Layer::AddLayerAnimationEventObserver(
1580     LayerAnimationEventObserver* animation_observer) {
1581   DCHECK(layer_animation_controller_);
1582   layer_animation_controller_->AddEventObserver(animation_observer);
1583 }
1584
1585 void Layer::RemoveLayerAnimationEventObserver(
1586     LayerAnimationEventObserver* animation_observer) {
1587   DCHECK(layer_animation_controller_);
1588   layer_animation_controller_->RemoveEventObserver(animation_observer);
1589 }
1590
1591 ScrollbarLayerInterface* Layer::ToScrollbarLayer() {
1592   return nullptr;
1593 }
1594
1595 RenderingStatsInstrumentation* Layer::rendering_stats_instrumentation() const {
1596   return layer_tree_host_->rendering_stats_instrumentation();
1597 }
1598
1599 void Layer::RemoveFromScrollTree() {
1600   if (scroll_children_.get()) {
1601     std::set<Layer*> copy = *scroll_children_;
1602     for (std::set<Layer*>::iterator it = copy.begin(); it != copy.end(); ++it)
1603       (*it)->SetScrollParent(nullptr);
1604   }
1605
1606   DCHECK(!scroll_children_);
1607   SetScrollParent(nullptr);
1608 }
1609
1610 void Layer::RemoveFromClipTree() {
1611   if (clip_children_.get()) {
1612     std::set<Layer*> copy = *clip_children_;
1613     for (std::set<Layer*>::iterator it = copy.begin(); it != copy.end(); ++it)
1614       (*it)->SetClipParent(nullptr);
1615   }
1616
1617   DCHECK(!clip_children_);
1618   SetClipParent(nullptr);
1619 }
1620
1621 void Layer::AddDrawableDescendants(int num) {
1622   DCHECK_GE(num_descendants_that_draw_content_, 0);
1623   DCHECK_GE(num_descendants_that_draw_content_ + num, 0);
1624   if (num == 0)
1625     return;
1626   num_descendants_that_draw_content_ += num;
1627   SetNeedsCommit();
1628   if (parent())
1629     parent()->AddDrawableDescendants(num);
1630 }
1631
1632 void Layer::RunMicroBenchmark(MicroBenchmark* benchmark) {
1633   benchmark->RunOnLayer(this);
1634 }
1635
1636 bool Layer::HasDelegatedContent() const {
1637   return false;
1638 }
1639
1640 void Layer::SetFrameTimingRequests(
1641     const std::vector<FrameTimingRequest>& requests) {
1642   // TODO(vmpstr): Early out if there are no changes earlier in the call stack.
1643   if (requests == frame_timing_requests_)
1644     return;
1645   frame_timing_requests_ = requests;
1646   frame_timing_requests_dirty_ = true;
1647   SetNeedsCommit();
1648 }
1649
1650 void Layer::DidBeginTracing() {
1651   // We'll be dumping layer trees as part of trace, so make sure
1652   // PushPropertiesTo() propagates layer debug info to the impl
1653   // side -- otherwise this won't happen for the the layers that
1654   // remain unchanged since tracing started.
1655   SetNeedsPushProperties();
1656 }
1657
1658 void Layer::set_visited(bool visited) {
1659   visited_tracker_ =
1660       visited ? layer_tree_host()->meta_information_sequence_number() : 0;
1661 }
1662
1663 bool Layer::visited() {
1664   return visited_tracker_ ==
1665          layer_tree_host()->meta_information_sequence_number();
1666 }
1667
1668 void Layer::set_layer_or_descendant_is_drawn(
1669     bool layer_or_descendant_is_drawn) {
1670   layer_or_descendant_is_drawn_tracker_ =
1671       layer_or_descendant_is_drawn
1672           ? layer_tree_host()->meta_information_sequence_number()
1673           : 0;
1674 }
1675
1676 bool Layer::layer_or_descendant_is_drawn() {
1677   return layer_or_descendant_is_drawn_tracker_ ==
1678          layer_tree_host()->meta_information_sequence_number();
1679 }
1680
1681 void Layer::set_sorted_for_recursion(bool sorted_for_recursion) {
1682   sorted_for_recursion_tracker_ =
1683       sorted_for_recursion
1684           ? layer_tree_host()->meta_information_sequence_number()
1685           : 0;
1686 }
1687
1688 bool Layer::sorted_for_recursion() {
1689   return sorted_for_recursion_tracker_ ==
1690          layer_tree_host()->meta_information_sequence_number();
1691 }
1692
1693 }  // namespace cc