cc/layers/layer_impl.cc

   1 // Copyright 2012 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_impl.h"
   6
   7 #include "base/json/json_reader.h"
   8 #include "base/numerics/safe_conversions.h"
   9 #include "base/strings/stringprintf.h"
  10 #include "base/trace_event/trace_event.h"
  11 #include "base/trace_event/trace_event_argument.h"
  12 #include "cc/animation/animation_registrar.h"
  13 #include "cc/animation/scrollbar_animation_controller.h"
  14 #include "cc/base/math_util.h"
  15 #include "cc/base/simple_enclosed_region.h"
  16 #include "cc/debug/debug_colors.h"
  17 #include "cc/debug/layer_tree_debug_state.h"
  18 #include "cc/debug/micro_benchmark_impl.h"
  19 #include "cc/debug/traced_value.h"
  20 #include "cc/input/scroll_state.h"
  21 #include "cc/layers/layer_utils.h"
  22 #include "cc/layers/painted_scrollbar_layer_impl.h"
  23 #include "cc/output/copy_output_request.h"
  24 #include "cc/quads/debug_border_draw_quad.h"
  25 #include "cc/quads/render_pass.h"
  26 #include "cc/trees/layer_tree_host_common.h"
  27 #include "cc/trees/layer_tree_impl.h"
  28 #include "cc/trees/layer_tree_settings.h"
  29 #include "cc/trees/proxy.h"
  30 #include "ui/gfx/geometry/box_f.h"
  31 #include "ui/gfx/geometry/point_conversions.h"
  32 #include "ui/gfx/geometry/quad_f.h"
  33 #include "ui/gfx/geometry/rect_conversions.h"
  34 #include "ui/gfx/geometry/size_conversions.h"
  35 #include "ui/gfx/geometry/vector2d_conversions.h"
  36
  37 namespace cc {
  38 LayerImpl::LayerImpl(LayerTreeImpl* layer_impl, int id)
  39     : LayerImpl(layer_impl, id, new LayerImpl::SyncedScrollOffset) {
  40 }
  41
  42 LayerImpl::LayerImpl(LayerTreeImpl* tree_impl,
  43                      int id,
  44                      scoped_refptr<SyncedScrollOffset> scroll_offset)
  45     : parent_(nullptr),
  46       scroll_parent_(nullptr),
  47       clip_parent_(nullptr),
  48       mask_layer_id_(-1),
  49       replica_layer_id_(-1),
  50       layer_id_(id),
  51       layer_tree_impl_(tree_impl),
  52       scroll_offset_(scroll_offset),
  53       scroll_clip_layer_(nullptr),
  54       should_scroll_on_main_thread_(false),
  55       have_wheel_event_handlers_(false),
  56       have_scroll_event_handlers_(false),
  57       scroll_blocks_on_(SCROLL_BLOCKS_ON_NONE),
  58       user_scrollable_horizontal_(true),
  59       user_scrollable_vertical_(true),
  60       stacking_order_changed_(false),
  61       double_sided_(true),
  62       should_flatten_transform_(true),
  63       should_flatten_transform_from_property_tree_(false),
  64       is_clipped_(false),
  65       layer_property_changed_(false),
  66       masks_to_bounds_(false),
  67       contents_opaque_(false),
  68       is_root_for_isolated_group_(false),
  69       use_parent_backface_visibility_(false),
  70       draws_content_(false),
  71       hide_layer_and_subtree_(false),
  72       transform_is_invertible_(true),
  73       is_container_for_fixed_position_layers_(false),
  74       is_affected_by_page_scale_(true),
  75       background_color_(0),
  76       opacity_(1.0),
  77       blend_mode_(SkXfermode::kSrcOver_Mode),
  78       draw_blend_mode_(SkXfermode::kSrcOver_Mode),
  79       num_descendants_that_draw_content_(0),
  80       transform_tree_index_(-1),
  81       effect_tree_index_(-1),
  82       clip_tree_index_(-1),
  83       draw_depth_(0.f),
  84       needs_push_properties_(false),
  85       num_dependents_need_push_properties_(0),
  86       sorting_context_id_(0),
  87       current_draw_mode_(DRAW_MODE_NONE),
  88       frame_timing_requests_dirty_(false),
  89       visited_(false),
  90       layer_or_descendant_is_drawn_(false),
  91       sorted_for_recursion_(false) {
  92   DCHECK_GT(layer_id_, 0);
  93   DCHECK(layer_tree_impl_);
  94   layer_tree_impl_->RegisterLayer(this);
  95
  96   if (!layer_tree_impl_->settings().use_compositor_animation_timelines) {
  97     AnimationRegistrar* registrar = layer_tree_impl_->GetAnimationRegistrar();
  98     layer_animation_controller_ =
  99         registrar->GetAnimationControllerForId(layer_id_);
 100     layer_animation_controller_->AddValueObserver(this);
 101     if (IsActive()) {
 102       layer_animation_controller_->set_value_provider(this);
 103       layer_animation_controller_->set_layer_animation_delegate(this);
 104     }
 105   }
 106   SetNeedsPushProperties();
 107 }
 108
 109 LayerImpl::~LayerImpl() {
 110   DCHECK_EQ(DRAW_MODE_NONE, current_draw_mode_);
 111
 112   if (layer_animation_controller_) {
 113     layer_animation_controller_->RemoveValueObserver(this);
 114     layer_animation_controller_->remove_value_provider(this);
 115     layer_animation_controller_->remove_layer_animation_delegate(this);
 116   }
 117
 118   if (!copy_requests_.empty() && layer_tree_impl_->IsActiveTree())
 119     layer_tree_impl()->RemoveLayerWithCopyOutputRequest(this);
 120   layer_tree_impl_->UnregisterLayer(this);
 121
 122   TRACE_EVENT_OBJECT_DELETED_WITH_ID(
 123       TRACE_DISABLED_BY_DEFAULT("cc.debug"), "cc::LayerImpl", this);
 124 }
 125
 126 void LayerImpl::AddChild(scoped_ptr<LayerImpl> child) {
 127   child->SetParent(this);
 128   DCHECK_EQ(layer_tree_impl(), child->layer_tree_impl());
 129   children_.push_back(child.Pass());
 130   layer_tree_impl()->set_needs_update_draw_properties();
 131 }
 132
 133 scoped_ptr<LayerImpl> LayerImpl::RemoveChild(LayerImpl* child) {
 134   for (OwnedLayerImplList::iterator it = children_.begin();
 135        it != children_.end();
 136        ++it) {
 137     if (*it == child) {
 138       scoped_ptr<LayerImpl> ret = children_.take(it);
 139       children_.erase(it);
 140       layer_tree_impl()->set_needs_update_draw_properties();
 141       return ret.Pass();
 142     }
 143   }
 144   return nullptr;
 145 }
 146
 147 void LayerImpl::SetParent(LayerImpl* parent) {
 148   if (parent_should_know_need_push_properties()) {
 149     if (parent_)
 150       parent_->RemoveDependentNeedsPushProperties();
 151     if (parent)
 152       parent->AddDependentNeedsPushProperties();
 153   }
 154   parent_ = parent;
 155 }
 156
 157 void LayerImpl::ClearChildList() {
 158   if (children_.empty())
 159     return;
 160
 161   children_.clear();
 162   layer_tree_impl()->set_needs_update_draw_properties();
 163 }
 164
 165 bool LayerImpl::HasAncestor(const LayerImpl* ancestor) const {
 166   if (!ancestor)
 167     return false;
 168
 169   for (const LayerImpl* layer = this; layer; layer = layer->parent()) {
 170     if (layer == ancestor)
 171       return true;
 172   }
 173
 174   return false;
 175 }
 176
 177 void LayerImpl::SetScrollParent(LayerImpl* parent) {
 178   if (scroll_parent_ == parent)
 179     return;
 180
 181   if (parent)
 182     DCHECK_EQ(layer_tree_impl()->LayerById(parent->id()), parent);
 183
 184   scroll_parent_ = parent;
 185   SetNeedsPushProperties();
 186 }
 187
 188 void LayerImpl::SetDebugInfo(
 189     scoped_refptr<base::trace_event::ConvertableToTraceFormat> other) {
 190   debug_info_ = other;
 191   SetNeedsPushProperties();
 192 }
 193
 194 void LayerImpl::SetScrollChildren(std::set<LayerImpl*>* children) {
 195   if (scroll_children_.get() == children)
 196     return;
 197   scroll_children_.reset(children);
 198   SetNeedsPushProperties();
 199 }
 200
 201 void LayerImpl::DistributeScroll(ScrollState* scroll_state) {
 202   DCHECK(scroll_state);
 203   if (scroll_state->FullyConsumed())
 204     return;
 205
 206   scroll_state->DistributeToScrollChainDescendant();
 207
 208   // If the scroll doesn't propagate, and we're currently scrolling
 209   // a layer other than this one, prevent the scroll from
 210   // propagating to this layer.
 211   if (!scroll_state->should_propagate() &&
 212       scroll_state->delta_consumed_for_scroll_sequence() &&
 213       scroll_state->current_native_scrolling_layer() != this) {
 214     return;
 215   }
 216
 217   ApplyScroll(scroll_state);
 218 }
 219
 220 void LayerImpl::ApplyScroll(ScrollState* scroll_state) {
 221   DCHECK(scroll_state);
 222   layer_tree_impl()->ApplyScroll(this, scroll_state);
 223 }
 224
 225 void LayerImpl::SetNumDescendantsThatDrawContent(int num_descendants) {
 226   if (num_descendants_that_draw_content_ == num_descendants)
 227     return;
 228   num_descendants_that_draw_content_ = num_descendants;
 229   SetNeedsPushProperties();
 230 }
 231
 232 void LayerImpl::SetClipParent(LayerImpl* ancestor) {
 233   if (clip_parent_ == ancestor)
 234     return;
 235
 236   clip_parent_ = ancestor;
 237   SetNeedsPushProperties();
 238 }
 239
 240 void LayerImpl::SetClipChildren(std::set<LayerImpl*>* children) {
 241   if (clip_children_.get() == children)
 242     return;
 243   clip_children_.reset(children);
 244   SetNeedsPushProperties();
 245 }
 246
 247 void LayerImpl::SetTransformTreeIndex(int index) {
 248   transform_tree_index_ = index;
 249   SetNeedsPushProperties();
 250 }
 251
 252 void LayerImpl::SetClipTreeIndex(int index) {
 253   clip_tree_index_ = index;
 254   SetNeedsPushProperties();
 255 }
 256
 257 void LayerImpl::SetEffectTreeIndex(int index) {
 258   effect_tree_index_ = index;
 259   SetNeedsPushProperties();
 260 }
 261
 262 void LayerImpl::PassCopyRequests(ScopedPtrVector<CopyOutputRequest>* requests) {
 263   // In the case that a layer still has a copy request, this means that there's
 264   // a commit to the active tree without a draw.  This only happens in some
 265   // edge cases during lost context or visibility changes, so don't try to
 266   // handle preserving these output requests (and their surface).
 267   if (!copy_requests_.empty()) {
 268     layer_tree_impl()->RemoveLayerWithCopyOutputRequest(this);
 269     // Destroying these will abort them.
 270     copy_requests_.clear();
 271   }
 272
 273   if (requests->empty())
 274     return;
 275
 276   DCHECK(render_surface());
 277   bool was_empty = copy_requests_.empty();
 278   copy_requests_.insert_and_take(copy_requests_.end(), requests);
 279   requests->clear();
 280
 281   if (was_empty && layer_tree_impl()->IsActiveTree())
 282     layer_tree_impl()->AddLayerWithCopyOutputRequest(this);
 283   NoteLayerPropertyChangedForSubtree();
 284 }
 285
 286 void LayerImpl::TakeCopyRequestsAndTransformToTarget(
 287     ScopedPtrVector<CopyOutputRequest>* requests) {
 288   DCHECK(!copy_requests_.empty());
 289   DCHECK(layer_tree_impl()->IsActiveTree());
 290   DCHECK_EQ(render_target(), this);
 291
 292   size_t first_inserted_request = requests->size();
 293   requests->insert_and_take(requests->end(), &copy_requests_);
 294   copy_requests_.clear();
 295
 296   for (size_t i = first_inserted_request; i < requests->size(); ++i) {
 297     CopyOutputRequest* request = requests->at(i);
 298     if (!request->has_area())
 299       continue;
 300
 301     gfx::Rect request_in_layer_space = request->area();
 302     request_in_layer_space.Intersect(gfx::Rect(bounds()));
 303     request->set_area(MathUtil::MapEnclosingClippedRect(
 304         draw_properties_.target_space_transform, request_in_layer_space));
 305   }
 306
 307   layer_tree_impl()->RemoveLayerWithCopyOutputRequest(this);
 308   layer_tree_impl()->set_needs_update_draw_properties();
 309 }
 310
 311 void LayerImpl::ClearRenderSurfaceLayerList() {
 312   if (render_surface_)
 313     render_surface_->ClearLayerLists();
 314 }
 315
 316 void LayerImpl::PopulateSharedQuadState(SharedQuadState* state) const {
 317   state->SetAll(draw_properties_.target_space_transform, bounds(),
 318                 draw_properties_.visible_layer_rect, draw_properties_.clip_rect,
 319                 is_clipped_, draw_properties_.opacity, draw_blend_mode_,
 320                 sorting_context_id_);
 321 }
 322
 323 void LayerImpl::PopulateScaledSharedQuadState(SharedQuadState* state,
 324                                               float scale) const {
 325   gfx::Transform scaled_draw_transform =
 326       draw_properties_.target_space_transform;
 327   scaled_draw_transform.Scale(SK_MScalar1 / scale, SK_MScalar1 / scale);
 328   gfx::Size scaled_bounds = gfx::ToCeiledSize(gfx::ScaleSize(bounds(), scale));
 329   gfx::Rect scaled_visible_layer_rect =
 330       gfx::ScaleToEnclosingRect(visible_layer_rect(), scale);
 331   scaled_visible_layer_rect.Intersect(gfx::Rect(scaled_bounds));
 332
 333   state->SetAll(scaled_draw_transform, scaled_bounds, scaled_visible_layer_rect,
 334                 draw_properties().clip_rect, is_clipped_,
 335                 draw_properties().opacity, draw_blend_mode_,
 336                 sorting_context_id_);
 337 }
 338
 339 bool LayerImpl::WillDraw(DrawMode draw_mode,
 340                          ResourceProvider* resource_provider) {
 341   // WillDraw/DidDraw must be matched.
 342   DCHECK_NE(DRAW_MODE_NONE, draw_mode);
 343   DCHECK_EQ(DRAW_MODE_NONE, current_draw_mode_);
 344   current_draw_mode_ = draw_mode;
 345   return true;
 346 }
 347
 348 void LayerImpl::DidDraw(ResourceProvider* resource_provider) {
 349   DCHECK_NE(DRAW_MODE_NONE, current_draw_mode_);
 350   current_draw_mode_ = DRAW_MODE_NONE;
 351 }
 352
 353 bool LayerImpl::ShowDebugBorders() const {
 354   return layer_tree_impl()->debug_state().show_debug_borders;
 355 }
 356
 357 void LayerImpl::GetDebugBorderProperties(SkColor* color, float* width) const {
 358   if (draws_content_) {
 359     *color = DebugColors::ContentLayerBorderColor();
 360     *width = DebugColors::ContentLayerBorderWidth(layer_tree_impl());
 361     return;
 362   }
 363
 364   if (masks_to_bounds_) {
 365     *color = DebugColors::MaskingLayerBorderColor();
 366     *width = DebugColors::MaskingLayerBorderWidth(layer_tree_impl());
 367     return;
 368   }
 369
 370   *color = DebugColors::ContainerLayerBorderColor();
 371   *width = DebugColors::ContainerLayerBorderWidth(layer_tree_impl());
 372 }
 373
 374 void LayerImpl::AppendDebugBorderQuad(
 375     RenderPass* render_pass,
 376     const gfx::Size& bounds,
 377     const SharedQuadState* shared_quad_state,
 378     AppendQuadsData* append_quads_data) const {
 379   SkColor color;
 380   float width;
 381   GetDebugBorderProperties(&color, &width);
 382   AppendDebugBorderQuad(render_pass, bounds, shared_quad_state,
 383                         append_quads_data, color, width);
 384 }
 385
 386 void LayerImpl::AppendDebugBorderQuad(RenderPass* render_pass,
 387                                       const gfx::Size& bounds,
 388                                       const SharedQuadState* shared_quad_state,
 389                                       AppendQuadsData* append_quads_data,
 390                                       SkColor color,
 391                                       float width) const {
 392   if (!ShowDebugBorders())
 393     return;
 394
 395   gfx::Rect quad_rect(bounds);
 396   gfx::Rect visible_quad_rect(quad_rect);
 397   DebugBorderDrawQuad* debug_border_quad =
 398       render_pass->CreateAndAppendDrawQuad<DebugBorderDrawQuad>();
 399   debug_border_quad->SetNew(
 400       shared_quad_state, quad_rect, visible_quad_rect, color, width);
 401   if (contents_opaque()) {
 402     // When opaque, draw a second inner border that is thicker than the outer
 403     // border, but more transparent.
 404     static const float kFillOpacity = 0.3f;
 405     SkColor fill_color = SkColorSetA(
 406         color, static_cast<uint8_t>(SkColorGetA(color) * kFillOpacity));
 407     float fill_width = width * 3;
 408     gfx::Rect fill_rect = quad_rect;
 409     fill_rect.Inset(fill_width / 2.f, fill_width / 2.f);
 410     if (fill_rect.IsEmpty())
 411       return;
 412     gfx::Rect visible_fill_rect =
 413         gfx::IntersectRects(visible_quad_rect, fill_rect);
 414     DebugBorderDrawQuad* fill_quad =
 415         render_pass->CreateAndAppendDrawQuad<DebugBorderDrawQuad>();
 416     fill_quad->SetNew(shared_quad_state, fill_rect, visible_fill_rect,
 417                       fill_color, fill_width);
 418   }
 419 }
 420
 421 bool LayerImpl::HasDelegatedContent() const {
 422   return false;
 423 }
 424
 425 bool LayerImpl::HasContributingDelegatedRenderPasses() const {
 426   return false;
 427 }
 428
 429 RenderPassId LayerImpl::FirstContributingRenderPassId() const {
 430   return RenderPassId(0, 0);
 431 }
 432
 433 RenderPassId LayerImpl::NextContributingRenderPassId(RenderPassId id) const {
 434   return RenderPassId(0, 0);
 435 }
 436
 437 void LayerImpl::GetContentsResourceId(ResourceId* resource_id,
 438                                       gfx::Size* resource_size) const {
 439   NOTREACHED();
 440   *resource_id = 0;
 441 }
 442
 443 gfx::Vector2dF LayerImpl::ScrollBy(const gfx::Vector2dF& scroll) {
 444   gfx::ScrollOffset adjusted_scroll(scroll);
 445   if (!user_scrollable_horizontal_)
 446     adjusted_scroll.set_x(0);
 447   if (!user_scrollable_vertical_)
 448     adjusted_scroll.set_y(0);
 449   DCHECK(scrollable());
 450   gfx::ScrollOffset old_offset = CurrentScrollOffset();
 451   gfx::ScrollOffset new_offset =
 452       ClampScrollOffsetToLimits(old_offset + adjusted_scroll);
 453   SetCurrentScrollOffset(new_offset);
 454
 455   gfx::ScrollOffset unscrolled =
 456       old_offset + gfx::ScrollOffset(scroll) - new_offset;
 457   return gfx::Vector2dF(unscrolled.x(), unscrolled.y());
 458 }
 459
 460 void LayerImpl::SetScrollClipLayer(int scroll_clip_layer_id) {
 461   scroll_clip_layer_ = layer_tree_impl()->LayerById(scroll_clip_layer_id);
 462 }
 463
 464 bool LayerImpl::user_scrollable(ScrollbarOrientation orientation) const {
 465   return (orientation == HORIZONTAL) ? user_scrollable_horizontal_
 466                                      : user_scrollable_vertical_;
 467 }
 468
 469 void LayerImpl::ApplySentScrollDeltasFromAbortedCommit() {
 470   DCHECK(layer_tree_impl()->IsActiveTree());
 471   scroll_offset_->AbortCommit();
 472 }
 473
 474 InputHandler::ScrollStatus LayerImpl::TryScroll(
 475     const gfx::PointF& screen_space_point,
 476     InputHandler::ScrollInputType type,
 477     ScrollBlocksOn effective_block_mode) const {
 478   if (should_scroll_on_main_thread()) {
 479     TRACE_EVENT0("cc", "LayerImpl::TryScroll: Failed ShouldScrollOnMainThread");
 480     return InputHandler::SCROLL_ON_MAIN_THREAD;
 481   }
 482
 483   if (!screen_space_transform().IsInvertible()) {
 484     TRACE_EVENT0("cc", "LayerImpl::TryScroll: Ignored NonInvertibleTransform");
 485     return InputHandler::SCROLL_IGNORED;
 486   }
 487
 488   if (!non_fast_scrollable_region().IsEmpty()) {
 489     bool clipped = false;
 490     gfx::Transform inverse_screen_space_transform(
 491         gfx::Transform::kSkipInitialization);
 492     if (!screen_space_transform().GetInverse(&inverse_screen_space_transform)) {
 493       // TODO(shawnsingh): We shouldn't be applying a projection if screen space
 494       // transform is uninvertible here. Perhaps we should be returning
 495       // SCROLL_ON_MAIN_THREAD in this case?
 496     }
 497
 498     gfx::PointF hit_test_point_in_layer_space = MathUtil::ProjectPoint(
 499         inverse_screen_space_transform, screen_space_point, &clipped);
 500     if (!clipped &&
 501         non_fast_scrollable_region().Contains(
 502             gfx::ToRoundedPoint(hit_test_point_in_layer_space))) {
 503       TRACE_EVENT0("cc",
 504                    "LayerImpl::tryScroll: Failed NonFastScrollableRegion");
 505       return InputHandler::SCROLL_ON_MAIN_THREAD;
 506     }
 507   }
 508
 509   if (have_scroll_event_handlers() &&
 510       effective_block_mode & SCROLL_BLOCKS_ON_SCROLL_EVENT) {
 511     TRACE_EVENT0("cc", "LayerImpl::tryScroll: Failed ScrollEventHandlers");
 512     return InputHandler::SCROLL_ON_MAIN_THREAD;
 513   }
 514
 515   if (type == InputHandler::WHEEL && have_wheel_event_handlers() &&
 516       effective_block_mode & SCROLL_BLOCKS_ON_WHEEL_EVENT) {
 517     TRACE_EVENT0("cc", "LayerImpl::tryScroll: Failed WheelEventHandlers");
 518     return InputHandler::SCROLL_ON_MAIN_THREAD;
 519   }
 520
 521   if (!scrollable()) {
 522     TRACE_EVENT0("cc", "LayerImpl::tryScroll: Ignored not scrollable");
 523     return InputHandler::SCROLL_IGNORED;
 524   }
 525
 526   gfx::ScrollOffset max_scroll_offset = MaxScrollOffset();
 527   if (max_scroll_offset.x() <= 0 && max_scroll_offset.y() <= 0) {
 528     TRACE_EVENT0("cc",
 529                  "LayerImpl::tryScroll: Ignored. Technically scrollable,"
 530                  " but has no affordance in either direction.");
 531     return InputHandler::SCROLL_IGNORED;
 532   }
 533
 534   return InputHandler::SCROLL_STARTED;
 535 }
 536
 537 skia::RefPtr<SkPicture> LayerImpl::GetPicture() {
 538   return skia::RefPtr<SkPicture>();
 539 }
 540
 541 scoped_ptr<LayerImpl> LayerImpl::CreateLayerImpl(LayerTreeImpl* tree_impl) {
 542   return LayerImpl::Create(tree_impl, layer_id_, scroll_offset_);
 543 }
 544
 545 void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
 546   layer->SetTransformOrigin(transform_origin_);
 547   layer->SetBackgroundColor(background_color_);
 548   layer->SetBounds(bounds_);
 549   layer->SetDoubleSided(double_sided_);
 550   layer->SetDrawsContent(DrawsContent());
 551   layer->SetHideLayerAndSubtree(hide_layer_and_subtree_);
 552   layer->SetHasRenderSurface(!!render_surface());
 553   layer->SetFilters(filters());
 554   layer->SetBackgroundFilters(background_filters());
 555   layer->SetMasksToBounds(masks_to_bounds_);
 556   layer->SetShouldScrollOnMainThread(should_scroll_on_main_thread_);
 557   layer->SetHaveWheelEventHandlers(have_wheel_event_handlers_);
 558   layer->SetHaveScrollEventHandlers(have_scroll_event_handlers_);
 559   layer->SetScrollBlocksOn(scroll_blocks_on_);
 560   layer->SetNonFastScrollableRegion(non_fast_scrollable_region_);
 561   layer->SetTouchEventHandlerRegion(touch_event_handler_region_);
 562   layer->SetContentsOpaque(contents_opaque_);
 563   layer->SetOpacity(opacity_);
 564   layer->SetBlendMode(blend_mode_);
 565   layer->SetIsRootForIsolatedGroup(is_root_for_isolated_group_);
 566   layer->SetPosition(position_);
 567   layer->SetIsContainerForFixedPositionLayers(
 568       is_container_for_fixed_position_layers_);
 569   layer->SetPositionConstraint(position_constraint_);
 570   layer->SetShouldFlattenTransform(should_flatten_transform_);
 571   layer->set_should_flatten_transform_from_property_tree(
 572       should_flatten_transform_from_property_tree_);
 573   layer->set_is_clipped(is_clipped_);
 574   layer->set_draw_blend_mode(draw_blend_mode_);
 575   layer->SetUseParentBackfaceVisibility(use_parent_backface_visibility_);
 576   layer->SetTransformAndInvertibility(transform_, transform_is_invertible_);
 577
 578   layer->SetScrollClipLayer(scroll_clip_layer_ ? scroll_clip_layer_->id()
 579                                                : Layer::INVALID_ID);
 580   layer->set_user_scrollable_horizontal(user_scrollable_horizontal_);
 581   layer->set_user_scrollable_vertical(user_scrollable_vertical_);
 582
 583   layer->SetScrollCompensationAdjustment(scroll_compensation_adjustment_);
 584
 585   layer->PushScrollOffset(nullptr);
 586
 587   layer->Set3dSortingContextId(sorting_context_id_);
 588   layer->SetNumDescendantsThatDrawContent(num_descendants_that_draw_content_);
 589
 590   layer->SetTransformTreeIndex(transform_tree_index_);
 591   layer->SetClipTreeIndex(clip_tree_index_);
 592   layer->SetEffectTreeIndex(effect_tree_index_);
 593   layer->set_offset_to_transform_parent(offset_to_transform_parent_);
 594
 595   LayerImpl* scroll_parent = nullptr;
 596   if (scroll_parent_) {
 597     scroll_parent = layer->layer_tree_impl()->LayerById(scroll_parent_->id());
 598     DCHECK(scroll_parent);
 599   }
 600
 601   layer->SetScrollParent(scroll_parent);
 602   if (scroll_children_) {
 603     std::set<LayerImpl*>* scroll_children = new std::set<LayerImpl*>;
 604     for (std::set<LayerImpl*>::iterator it = scroll_children_->begin();
 605          it != scroll_children_->end();
 606          ++it) {
 607       DCHECK_EQ((*it)->scroll_parent(), this);
 608       LayerImpl* scroll_child =
 609           layer->layer_tree_impl()->LayerById((*it)->id());
 610       DCHECK(scroll_child);
 611       scroll_children->insert(scroll_child);
 612     }
 613     layer->SetScrollChildren(scroll_children);
 614   } else {
 615     layer->SetScrollChildren(nullptr);
 616   }
 617
 618   LayerImpl* clip_parent = nullptr;
 619   if (clip_parent_) {
 620     clip_parent = layer->layer_tree_impl()->LayerById(
 621         clip_parent_->id());
 622     DCHECK(clip_parent);
 623   }
 624
 625   layer->SetClipParent(clip_parent);
 626   if (clip_children_) {
 627     std::set<LayerImpl*>* clip_children = new std::set<LayerImpl*>;
 628     for (std::set<LayerImpl*>::iterator it = clip_children_->begin();
 629         it != clip_children_->end(); ++it)
 630       clip_children->insert(layer->layer_tree_impl()->LayerById((*it)->id()));
 631     layer->SetClipChildren(clip_children);
 632   } else {
 633     layer->SetClipChildren(nullptr);
 634   }
 635
 636   layer->PassCopyRequests(&copy_requests_);
 637
 638   // If the main thread commits multiple times before the impl thread actually
 639   // draws, then damage tracking will become incorrect if we simply clobber the
 640   // update_rect here. The LayerImpl's update_rect needs to accumulate (i.e.
 641   // union) any update changes that have occurred on the main thread.
 642   update_rect_.Union(layer->update_rect());
 643   layer->SetUpdateRect(update_rect_);
 644
 645   layer->SetStackingOrderChanged(stacking_order_changed_);
 646   layer->SetDebugInfo(debug_info_);
 647
 648   if (frame_timing_requests_dirty_) {
 649     layer->SetFrameTimingRequests(frame_timing_requests_);
 650     frame_timing_requests_dirty_ = false;
 651   }
 652
 653   // Reset any state that should be cleared for the next update.
 654   stacking_order_changed_ = false;
 655   update_rect_ = gfx::Rect();
 656   needs_push_properties_ = false;
 657   num_dependents_need_push_properties_ = 0;
 658 }
 659
 660 gfx::Vector2dF LayerImpl::FixedContainerSizeDelta() const {
 661   if (!scroll_clip_layer_)
 662     return gfx::Vector2dF();
 663
 664   gfx::Vector2dF delta_from_scroll = scroll_clip_layer_->bounds_delta();
 665
 666   // In virtual-viewport mode, we don't need to compensate for pinch zoom or
 667   // scale since the fixed container is the outer viewport, which sits below
 668   // the page scale.
 669   return delta_from_scroll;
 670 }
 671
 672 base::DictionaryValue* LayerImpl::LayerTreeAsJson() const {
 673   base::DictionaryValue* result = new base::DictionaryValue;
 674   result->SetInteger("LayerId", id());
 675   result->SetString("LayerType", LayerTypeAsString());
 676
 677   base::ListValue* list = new base::ListValue;
 678   list->AppendInteger(bounds().width());
 679   list->AppendInteger(bounds().height());
 680   result->Set("Bounds", list);
 681
 682   list = new base::ListValue;
 683   list->AppendDouble(position_.x());
 684   list->AppendDouble(position_.y());
 685   result->Set("Position", list);
 686
 687   const gfx::Transform& gfx_transform = draw_properties_.target_space_transform;
 688   double transform[16];
 689   gfx_transform.matrix().asColMajord(transform);
 690   list = new base::ListValue;
 691   for (int i = 0; i < 16; ++i)
 692     list->AppendDouble(transform[i]);
 693   result->Set("DrawTransform", list);
 694
 695   result->SetBoolean("DrawsContent", draws_content_);
 696   result->SetBoolean("Is3dSorted", Is3dSorted());
 697   result->SetDouble("OPACITY", opacity());
 698   result->SetBoolean("ContentsOpaque", contents_opaque_);
 699
 700   if (scrollable())
 701     result->SetBoolean("Scrollable", true);
 702
 703   if (have_wheel_event_handlers_)
 704     result->SetBoolean("WheelHandler", have_wheel_event_handlers_);
 705   if (have_scroll_event_handlers_)
 706     result->SetBoolean("ScrollHandler", have_scroll_event_handlers_);
 707   if (!touch_event_handler_region_.IsEmpty()) {
 708     scoped_ptr<base::Value> region = touch_event_handler_region_.AsValue();
 709     result->Set("TouchRegion", region.release());
 710   }
 711
 712   if (scroll_blocks_on_) {
 713     list = new base::ListValue;
 714     if (scroll_blocks_on_ & SCROLL_BLOCKS_ON_START_TOUCH)
 715       list->AppendString("StartTouch");
 716     if (scroll_blocks_on_ & SCROLL_BLOCKS_ON_WHEEL_EVENT)
 717       list->AppendString("WheelEvent");
 718     if (scroll_blocks_on_ & SCROLL_BLOCKS_ON_SCROLL_EVENT)
 719       list->AppendString("ScrollEvent");
 720     result->Set("ScrollBlocksOn", list);
 721   }
 722
 723   list = new base::ListValue;
 724   for (size_t i = 0; i < children_.size(); ++i)
 725     list->Append(children_[i]->LayerTreeAsJson());
 726   result->Set("Children", list);
 727
 728   return result;
 729 }
 730
 731 void LayerImpl::SetStackingOrderChanged(bool stacking_order_changed) {
 732   if (stacking_order_changed) {
 733     stacking_order_changed_ = true;
 734     NoteLayerPropertyChangedForSubtree();
 735   }
 736 }
 737
 738 void LayerImpl::NoteLayerPropertyChanged() {
 739   layer_property_changed_ = true;
 740   layer_tree_impl()->set_needs_update_draw_properties();
 741   SetNeedsPushProperties();
 742 }
 743
 744 void LayerImpl::NoteLayerPropertyChangedForSubtree() {
 745   layer_property_changed_ = true;
 746   layer_tree_impl()->set_needs_update_draw_properties();
 747   for (size_t i = 0; i < children_.size(); ++i)
 748     children_[i]->NoteLayerPropertyChangedForDescendantsInternal();
 749   SetNeedsPushProperties();
 750 }
 751
 752 void LayerImpl::NoteLayerPropertyChangedForDescendantsInternal() {
 753   layer_property_changed_ = true;
 754   for (size_t i = 0; i < children_.size(); ++i)
 755     children_[i]->NoteLayerPropertyChangedForDescendantsInternal();
 756 }
 757
 758 void LayerImpl::NoteLayerPropertyChangedForDescendants() {
 759   layer_tree_impl()->set_needs_update_draw_properties();
 760   for (size_t i = 0; i < children_.size(); ++i)
 761     children_[i]->NoteLayerPropertyChangedForDescendantsInternal();
 762   SetNeedsPushProperties();
 763 }
 764
 765 void LayerImpl::ValidateQuadResourcesInternal(DrawQuad* quad) const {
 766 #if DCHECK_IS_ON()
 767   const ResourceProvider* resource_provider =
 768       layer_tree_impl_->resource_provider();
 769   for (ResourceId resource_id : quad->resources)
 770     resource_provider->ValidateResource(resource_id);
 771 #endif
 772 }
 773
 774 const char* LayerImpl::LayerTypeAsString() const {
 775   return "cc::LayerImpl";
 776 }
 777
 778 void LayerImpl::ResetAllChangeTrackingForSubtree() {
 779   layer_property_changed_ = false;
 780
 781   update_rect_ = gfx::Rect();
 782   damage_rect_ = gfx::RectF();
 783
 784   if (render_surface_)
 785     render_surface_->ResetPropertyChangedFlag();
 786
 787   if (mask_layer_)
 788     mask_layer_->ResetAllChangeTrackingForSubtree();
 789
 790   if (replica_layer_) {
 791     // This also resets the replica mask, if it exists.
 792     replica_layer_->ResetAllChangeTrackingForSubtree();
 793   }
 794
 795   for (size_t i = 0; i < children_.size(); ++i)
 796     children_[i]->ResetAllChangeTrackingForSubtree();
 797
 798   needs_push_properties_ = false;
 799   num_dependents_need_push_properties_ = 0;
 800 }
 801
 802 void LayerImpl::UpdatePropertyTreeTransform() {
 803   if (transform_tree_index_ != -1) {
 804     TransformTree& transform_tree =
 805         layer_tree_impl()->property_trees()->transform_tree;
 806     TransformNode* node = transform_tree.Node(transform_tree_index_);
 807     // A LayerImpl's own current state is insufficient for determining whether
 808     // it owns a TransformNode, since this depends on the state of the
 809     // corresponding Layer at the time of the last commit. For example, a
 810     // transform animation might have been in progress at the time the last
 811     // commit started, but might have finished since then on the compositor
 812     // thread.
 813     if (node->owner_id != id())
 814       return;
 815     if (node->data.local != transform_) {
 816       node->data.local = transform_;
 817       node->data.needs_local_transform_update = true;
 818       transform_tree.set_needs_update(true);
 819       // TODO(ajuma): The current criteria for creating clip nodes means that
 820       // property trees may need to be rebuilt when the new transform isn't
 821       // axis-aligned wrt the old transform (see Layer::SetTransform). Since
 822       // rebuilding property trees every frame of a transform animation is
 823       // something we should try to avoid, change property tree-building so that
 824       // it doesn't depend on axis aliginment.
 825     }
 826   }
 827 }
 828
 829 void LayerImpl::UpdatePropertyTreeTransformIsAnimated(bool is_animated) {
 830   if (transform_tree_index_ != -1) {
 831     TransformTree& transform_tree =
 832         layer_tree_impl()->property_trees()->transform_tree;
 833     TransformNode* node = transform_tree.Node(transform_tree_index_);
 834     // A LayerImpl's own current state is insufficient for determining whether
 835     // it owns a TransformNode, since this depends on the state of the
 836     // corresponding Layer at the time of the last commit. For example, if
 837     // |is_animated| is false, this might mean a transform animation just ticked
 838     // past its finish point (so the LayerImpl still owns a TransformNode) or it
 839     // might mean that a transform animation was removed during commit or
 840     // activation (and, in that case, the LayerImpl will no longer own a
 841     // TransformNode, unless it has non-animation-related reasons for owning a
 842     // node).
 843     if (node->owner_id != id())
 844       return;
 845     if (node->data.is_animated != is_animated) {
 846       node->data.is_animated = is_animated;
 847       if (is_animated) {
 848         float maximum_target_scale = 0.f;
 849         node->data.local_maximum_animation_target_scale =
 850             MaximumTargetScale(&maximum_target_scale) ? maximum_target_scale
 851                                                       : 0.f;
 852
 853         float animation_start_scale = 0.f;
 854         node->data.local_starting_animation_scale =
 855             AnimationStartScale(&animation_start_scale) ? animation_start_scale
 856                                                         : 0.f;
 857
 858         node->data.has_only_translation_animations =
 859             HasOnlyTranslationTransforms();
 860       } else {
 861         node->data.local_maximum_animation_target_scale = 0.f;
 862         node->data.local_starting_animation_scale = 0.f;
 863         node->data.has_only_translation_animations = true;
 864       }
 865
 866       transform_tree.set_needs_update(true);
 867     }
 868   }
 869 }
 870
 871 void LayerImpl::UpdatePropertyTreeOpacity() {
 872   if (effect_tree_index_ != -1) {
 873     EffectTree& effect_tree = layer_tree_impl()->property_trees()->effect_tree;
 874     EffectNode* node = effect_tree.Node(effect_tree_index_);
 875     // A LayerImpl's own current state is insufficient for determining whether
 876     // it owns an OpacityNode, since this depends on the state of the
 877     // corresponding Layer at the time of the last commit. For example, an
 878     // opacity animation might have been in progress at the time the last commit
 879     // started, but might have finished since then on the compositor thread.
 880     if (node->owner_id != id())
 881       return;
 882     node->data.opacity = opacity_;
 883     effect_tree.set_needs_update(true);
 884   }
 885 }
 886
 887 void LayerImpl::UpdatePropertyTreeForScrollingAndAnimationIfNeeded() {
 888   if (scrollable())
 889     UpdatePropertyTreeScrollOffset();
 890
 891   if (HasAnyAnimationTargetingProperty(Animation::OPACITY))
 892     UpdatePropertyTreeOpacity();
 893
 894   if (HasAnyAnimationTargetingProperty(Animation::TRANSFORM)) {
 895     UpdatePropertyTreeTransform();
 896     UpdatePropertyTreeTransformIsAnimated(
 897         HasPotentiallyRunningTransformAnimation());
 898   }
 899 }
 900
 901 gfx::ScrollOffset LayerImpl::ScrollOffsetForAnimation() const {
 902   return CurrentScrollOffset();
 903 }
 904
 905 void LayerImpl::OnFilterAnimated(const FilterOperations& filters) {
 906   SetFilters(filters);
 907 }
 908
 909 void LayerImpl::OnOpacityAnimated(float opacity) {
 910   SetOpacity(opacity);
 911   UpdatePropertyTreeOpacity();
 912 }
 913
 914 void LayerImpl::OnTransformAnimated(const gfx::Transform& transform) {
 915   SetTransform(transform);
 916   UpdatePropertyTreeTransform();
 917 }
 918
 919 void LayerImpl::OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) {
 920   // Only layers in the active tree should need to do anything here, since
 921   // layers in the pending tree will find out about these changes as a
 922   // result of the shared SyncedProperty.
 923   if (!IsActive())
 924     return;
 925
 926   SetCurrentScrollOffset(scroll_offset);
 927
 928   layer_tree_impl_->DidAnimateScrollOffset();
 929 }
 930
 931 void LayerImpl::OnAnimationWaitingForDeletion() {}
 932
 933 void LayerImpl::OnTransformIsPotentiallyAnimatingChanged(bool is_animating) {
 934   UpdatePropertyTreeTransformIsAnimated(is_animating);
 935 }
 936
 937 bool LayerImpl::IsActive() const {
 938   return layer_tree_impl_->IsActiveTree();
 939 }
 940
 941 gfx::Size LayerImpl::bounds() const {
 942   gfx::Vector2d delta = gfx::ToCeiledVector2d(bounds_delta_);
 943   return gfx::Size(bounds_.width() + delta.x(),
 944                    bounds_.height() + delta.y());
 945 }
 946
 947 gfx::SizeF LayerImpl::BoundsForScrolling() const {
 948   return gfx::SizeF(bounds_.width() + bounds_delta_.x(),
 949                     bounds_.height() + bounds_delta_.y());
 950 }
 951
 952 void LayerImpl::SetBounds(const gfx::Size& bounds) {
 953   if (bounds_ == bounds)
 954     return;
 955
 956   bounds_ = bounds;
 957
 958   ScrollbarParametersDidChange(true);
 959   if (masks_to_bounds())
 960     NoteLayerPropertyChangedForSubtree();
 961   else
 962     NoteLayerPropertyChanged();
 963 }
 964
 965 void LayerImpl::SetBoundsDelta(const gfx::Vector2dF& bounds_delta) {
 966   DCHECK(IsActive());
 967   if (bounds_delta_ == bounds_delta)
 968     return;
 969
 970   bounds_delta_ = bounds_delta;
 971
 972   TransformTree& transform_tree =
 973       layer_tree_impl()->property_trees()->transform_tree;
 974   if (this == layer_tree_impl()->InnerViewportContainerLayer())
 975     transform_tree.SetInnerViewportBoundsDelta(bounds_delta);
 976   else if (this == layer_tree_impl()->OuterViewportContainerLayer())
 977     transform_tree.SetOuterViewportBoundsDelta(bounds_delta);
 978
 979   ScrollbarParametersDidChange(true);
 980
 981   if (masks_to_bounds()) {
 982     // If layer is clipping, then update the clip node using the new bounds.
 983     ClipNode* clip_node =
 984         layer_tree_impl()->property_trees()->clip_tree.Node(clip_tree_index());
 985     if (clip_node) {
 986       DCHECK(id() == clip_node->owner_id);
 987       clip_node->data.clip =
 988           gfx::RectF(gfx::PointF() + offset_to_transform_parent(), bounds());
 989       layer_tree_impl()->property_trees()->clip_tree.set_needs_update(true);
 990     }
 991
 992     NoteLayerPropertyChangedForSubtree();
 993   } else {
 994     NoteLayerPropertyChanged();
 995   }
 996 }
 997
 998 void LayerImpl::SetMaskLayer(scoped_ptr<LayerImpl> mask_layer) {
 999   int new_layer_id = mask_layer ? mask_layer->id() : -1;
1000
1001   if (mask_layer) {
1002     DCHECK_EQ(layer_tree_impl(), mask_layer->layer_tree_impl());
1003     DCHECK_NE(new_layer_id, mask_layer_id_);
1004   } else if (new_layer_id == mask_layer_id_) {
1005     return;
1006   }
1007
1008   mask_layer_ = mask_layer.Pass();
1009   mask_layer_id_ = new_layer_id;
1010   if (mask_layer_)
1011     mask_layer_->SetParent(this);
1012   NoteLayerPropertyChangedForSubtree();
1013 }
1014
1015 scoped_ptr<LayerImpl> LayerImpl::TakeMaskLayer() {
1016   mask_layer_id_ = -1;
1017   return mask_layer_.Pass();
1018 }
1019
1020 void LayerImpl::SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer) {
1021   int new_layer_id = replica_layer ? replica_layer->id() : -1;
1022
1023   if (replica_layer) {
1024     DCHECK_EQ(layer_tree_impl(), replica_layer->layer_tree_impl());
1025     DCHECK_NE(new_layer_id, replica_layer_id_);
1026   } else if (new_layer_id == replica_layer_id_) {
1027     return;
1028   }
1029
1030   replica_layer_ = replica_layer.Pass();
1031   replica_layer_id_ = new_layer_id;
1032   if (replica_layer_)
1033     replica_layer_->SetParent(this);
1034   NoteLayerPropertyChangedForSubtree();
1035 }
1036
1037 scoped_ptr<LayerImpl> LayerImpl::TakeReplicaLayer() {
1038   replica_layer_id_ = -1;
1039   return replica_layer_.Pass();
1040 }
1041
1042 ScrollbarLayerImplBase* LayerImpl::ToScrollbarLayer() {
1043   return nullptr;
1044 }
1045
1046 void LayerImpl::SetDrawsContent(bool draws_content) {
1047   if (draws_content_ == draws_content)
1048     return;
1049
1050   draws_content_ = draws_content;
1051   NoteLayerPropertyChanged();
1052 }
1053
1054 void LayerImpl::SetHideLayerAndSubtree(bool hide) {
1055   if (hide_layer_and_subtree_ == hide)
1056     return;
1057
1058   hide_layer_and_subtree_ = hide;
1059   NoteLayerPropertyChangedForSubtree();
1060 }
1061
1062 void LayerImpl::SetTransformOrigin(const gfx::Point3F& transform_origin) {
1063   if (transform_origin_ == transform_origin)
1064     return;
1065   transform_origin_ = transform_origin;
1066   NoteLayerPropertyChangedForSubtree();
1067 }
1068
1069 void LayerImpl::SetBackgroundColor(SkColor background_color) {
1070   if (background_color_ == background_color)
1071     return;
1072
1073   background_color_ = background_color;
1074   NoteLayerPropertyChanged();
1075 }
1076
1077 SkColor LayerImpl::SafeOpaqueBackgroundColor() const {
1078   SkColor color = background_color();
1079   if (SkColorGetA(color) == 255 && !contents_opaque()) {
1080     color = SK_ColorTRANSPARENT;
1081   } else if (SkColorGetA(color) != 255 && contents_opaque()) {
1082     for (const LayerImpl* layer = parent(); layer;
1083          layer = layer->parent()) {
1084       color = layer->background_color();
1085       if (SkColorGetA(color) == 255)
1086         break;
1087     }
1088     if (SkColorGetA(color) != 255)
1089       color = layer_tree_impl()->background_color();
1090     if (SkColorGetA(color) != 255)
1091       color = SkColorSetA(color, 255);
1092   }
1093   return color;
1094 }
1095
1096 void LayerImpl::SetFilters(const FilterOperations& filters) {
1097   if (filters_ == filters)
1098     return;
1099
1100   filters_ = filters;
1101   NoteLayerPropertyChangedForSubtree();
1102 }
1103
1104 bool LayerImpl::FilterIsAnimating() const {
1105   LayerAnimationController::ObserverType observer_type =
1106       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1107                  : LayerAnimationController::ObserverType::PENDING;
1108   return layer_animation_controller_
1109              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
1110                    Animation::FILTER, observer_type)
1111              : layer_tree_impl_->IsAnimatingFilterProperty(this);
1112 }
1113
1114 bool LayerImpl::HasPotentiallyRunningFilterAnimation() const {
1115   LayerAnimationController::ObserverType observer_type =
1116       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1117                  : LayerAnimationController::ObserverType::PENDING;
1118   return layer_animation_controller_
1119              ? layer_animation_controller_->IsPotentiallyAnimatingProperty(
1120                    Animation::FILTER, observer_type)
1121              : layer_tree_impl_->HasPotentiallyRunningFilterAnimation(this);
1122 }
1123
1124 bool LayerImpl::FilterIsAnimatingOnImplOnly() const {
1125   if (!layer_animation_controller_)
1126     return layer_tree_impl_->FilterIsAnimatingOnImplOnly(this);
1127
1128   Animation* filter_animation =
1129       layer_animation_controller_->GetAnimation(Animation::FILTER);
1130   return filter_animation && filter_animation->is_impl_only();
1131 }
1132
1133 void LayerImpl::SetBackgroundFilters(
1134     const FilterOperations& filters) {
1135   if (background_filters_ == filters)
1136     return;
1137
1138   background_filters_ = filters;
1139   NoteLayerPropertyChanged();
1140 }
1141
1142 void LayerImpl::SetMasksToBounds(bool masks_to_bounds) {
1143   if (masks_to_bounds_ == masks_to_bounds)
1144     return;
1145
1146   masks_to_bounds_ = masks_to_bounds;
1147   NoteLayerPropertyChangedForSubtree();
1148 }
1149
1150 void LayerImpl::SetContentsOpaque(bool opaque) {
1151   if (contents_opaque_ == opaque)
1152     return;
1153
1154   contents_opaque_ = opaque;
1155   NoteLayerPropertyChangedForSubtree();
1156 }
1157
1158 void LayerImpl::SetOpacity(float opacity) {
1159   if (opacity_ == opacity)
1160     return;
1161
1162   opacity_ = opacity;
1163   NoteLayerPropertyChangedForSubtree();
1164 }
1165
1166 bool LayerImpl::OpacityIsAnimating() const {
1167   LayerAnimationController::ObserverType observer_type =
1168       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1169                  : LayerAnimationController::ObserverType::PENDING;
1170   return layer_animation_controller_
1171              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
1172                    Animation::OPACITY, observer_type)
1173              : layer_tree_impl_->IsAnimatingOpacityProperty(this);
1174 }
1175
1176 bool LayerImpl::HasPotentiallyRunningOpacityAnimation() const {
1177   LayerAnimationController::ObserverType observer_type =
1178       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1179                  : LayerAnimationController::ObserverType::PENDING;
1180   return layer_animation_controller_
1181              ? layer_animation_controller_->IsPotentiallyAnimatingProperty(
1182                    Animation::OPACITY, observer_type)
1183              : layer_tree_impl_->HasPotentiallyRunningOpacityAnimation(this);
1184 }
1185
1186 bool LayerImpl::OpacityIsAnimatingOnImplOnly() const {
1187   if (!layer_animation_controller_)
1188     return layer_tree_impl_->OpacityIsAnimatingOnImplOnly(this);
1189
1190   Animation* opacity_animation =
1191       layer_animation_controller_->GetAnimation(Animation::OPACITY);
1192   return opacity_animation && opacity_animation->is_impl_only();
1193 }
1194
1195 void LayerImpl::SetBlendMode(SkXfermode::Mode blend_mode) {
1196   if (blend_mode_ == blend_mode)
1197     return;
1198
1199   blend_mode_ = blend_mode;
1200   NoteLayerPropertyChangedForSubtree();
1201 }
1202
1203 void LayerImpl::SetIsRootForIsolatedGroup(bool root) {
1204   if (is_root_for_isolated_group_ == root)
1205     return;
1206
1207   is_root_for_isolated_group_ = root;
1208   SetNeedsPushProperties();
1209 }
1210
1211 void LayerImpl::SetPosition(const gfx::PointF& position) {
1212   if (position_ == position)
1213     return;
1214
1215   position_ = position;
1216   NoteLayerPropertyChangedForSubtree();
1217 }
1218
1219 void LayerImpl::SetShouldFlattenTransform(bool flatten) {
1220   if (should_flatten_transform_ == flatten)
1221     return;
1222
1223   should_flatten_transform_ = flatten;
1224   NoteLayerPropertyChangedForSubtree();
1225 }
1226
1227 void LayerImpl::Set3dSortingContextId(int id) {
1228   if (id == sorting_context_id_)
1229     return;
1230   sorting_context_id_ = id;
1231   NoteLayerPropertyChangedForSubtree();
1232 }
1233
1234 void LayerImpl::SetFrameTimingRequests(
1235     const std::vector<FrameTimingRequest>& requests) {
1236   frame_timing_requests_ = requests;
1237   frame_timing_requests_dirty_ = true;
1238   SetNeedsPushProperties();
1239 }
1240
1241 void LayerImpl::GatherFrameTimingRequestIds(std::vector<int64_t>* request_ids) {
1242   for (const auto& request : frame_timing_requests_)
1243     request_ids->push_back(request.id());
1244 }
1245
1246 void LayerImpl::SetTransform(const gfx::Transform& transform) {
1247   if (transform_ == transform)
1248     return;
1249
1250   transform_ = transform;
1251   transform_is_invertible_ = transform_.IsInvertible();
1252   NoteLayerPropertyChangedForSubtree();
1253 }
1254
1255 void LayerImpl::SetTransformAndInvertibility(const gfx::Transform& transform,
1256                                              bool transform_is_invertible) {
1257   if (transform_ == transform) {
1258     DCHECK(transform_is_invertible_ == transform_is_invertible)
1259         << "Can't change invertibility if transform is unchanged";
1260     return;
1261   }
1262   transform_ = transform;
1263   transform_is_invertible_ = transform_is_invertible;
1264   NoteLayerPropertyChangedForSubtree();
1265 }
1266
1267 bool LayerImpl::TransformIsAnimating() const {
1268   LayerAnimationController::ObserverType observer_type =
1269       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1270                  : LayerAnimationController::ObserverType::PENDING;
1271   return layer_animation_controller_
1272              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
1273                    Animation::TRANSFORM, observer_type)
1274              : layer_tree_impl_->IsAnimatingTransformProperty(this);
1275 }
1276
1277 bool LayerImpl::HasPotentiallyRunningTransformAnimation() const {
1278   LayerAnimationController::ObserverType observer_type =
1279       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1280                  : LayerAnimationController::ObserverType::PENDING;
1281   return layer_animation_controller_
1282              ? layer_animation_controller_->IsPotentiallyAnimatingProperty(
1283                    Animation::TRANSFORM, observer_type)
1284              : layer_tree_impl_->HasPotentiallyRunningTransformAnimation(this);
1285 }
1286
1287 bool LayerImpl::TransformIsAnimatingOnImplOnly() const {
1288   if (!layer_animation_controller_)
1289     return layer_tree_impl_->TransformIsAnimatingOnImplOnly(this);
1290
1291   Animation* transform_animation =
1292       layer_animation_controller_->GetAnimation(Animation::TRANSFORM);
1293   return transform_animation && transform_animation->is_impl_only();
1294 }
1295
1296 bool LayerImpl::HasOnlyTranslationTransforms() const {
1297   if (!layer_animation_controller_)
1298     return layer_tree_impl_->HasOnlyTranslationTransforms(this);
1299
1300   LayerAnimationController::ObserverType observer_type =
1301       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1302                  : LayerAnimationController::ObserverType::PENDING;
1303   return layer_animation_controller_->HasOnlyTranslationTransforms(
1304       observer_type);
1305 }
1306
1307 bool LayerImpl::MaximumTargetScale(float* max_scale) const {
1308   if (!layer_animation_controller_)
1309     return layer_tree_impl_->MaximumTargetScale(this, max_scale);
1310
1311   LayerAnimationController::ObserverType observer_type =
1312       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1313                  : LayerAnimationController::ObserverType::PENDING;
1314   return layer_animation_controller_->MaximumTargetScale(observer_type,
1315                                                          max_scale);
1316 }
1317
1318 bool LayerImpl::AnimationStartScale(float* start_scale) const {
1319   if (!layer_animation_controller_)
1320     return layer_tree_impl_->AnimationStartScale(this, start_scale);
1321
1322   LayerAnimationController::ObserverType observer_type =
1323       IsActive() ? LayerAnimationController::ObserverType::ACTIVE
1324                  : LayerAnimationController::ObserverType::PENDING;
1325   return layer_animation_controller_->AnimationStartScale(observer_type,
1326                                                           start_scale);
1327 }
1328
1329 bool LayerImpl::HasAnyAnimationTargetingProperty(
1330     Animation::TargetProperty property) const {
1331   if (!layer_animation_controller_)
1332     return layer_tree_impl_->HasAnyAnimationTargetingProperty(this, property);
1333
1334   return !!layer_animation_controller_->GetAnimation(property);
1335 }
1336
1337 bool LayerImpl::HasFilterAnimationThatInflatesBounds() const {
1338   if (!layer_animation_controller_)
1339     return layer_tree_impl_->HasFilterAnimationThatInflatesBounds(this);
1340
1341   return layer_animation_controller_->HasFilterAnimationThatInflatesBounds();
1342 }
1343
1344 bool LayerImpl::HasTransformAnimationThatInflatesBounds() const {
1345   if (!layer_animation_controller_)
1346     return layer_tree_impl_->HasTransformAnimationThatInflatesBounds(this);
1347
1348   return layer_animation_controller_->HasTransformAnimationThatInflatesBounds();
1349 }
1350
1351 bool LayerImpl::HasAnimationThatInflatesBounds() const {
1352   if (!layer_animation_controller_)
1353     return layer_tree_impl_->HasAnimationThatInflatesBounds(this);
1354
1355   return layer_animation_controller_->HasAnimationThatInflatesBounds();
1356 }
1357
1358 bool LayerImpl::FilterAnimationBoundsForBox(const gfx::BoxF& box,
1359                                             gfx::BoxF* bounds) const {
1360   if (!layer_animation_controller_)
1361     return layer_tree_impl_->FilterAnimationBoundsForBox(this, box, bounds);
1362
1363   return layer_animation_controller_->FilterAnimationBoundsForBox(box, bounds);
1364 }
1365
1366 bool LayerImpl::TransformAnimationBoundsForBox(const gfx::BoxF& box,
1367                                                gfx::BoxF* bounds) const {
1368   if (!layer_animation_controller_)
1369     return layer_tree_impl_->TransformAnimationBoundsForBox(this, box, bounds);
1370
1371   return layer_animation_controller_->TransformAnimationBoundsForBox(box,
1372                                                                      bounds);
1373 }
1374
1375 void LayerImpl::SetUpdateRect(const gfx::Rect& update_rect) {
1376   update_rect_ = update_rect;
1377   SetNeedsPushProperties();
1378 }
1379
1380 void LayerImpl::AddDamageRect(const gfx::RectF& damage_rect) {
1381   damage_rect_ = gfx::UnionRects(damage_rect_, damage_rect);
1382 }
1383
1384 bool LayerImpl::IsExternalScrollActive() const {
1385   return layer_tree_impl_->IsExternalScrollActive();
1386 }
1387
1388 void LayerImpl::SetCurrentScrollOffset(const gfx::ScrollOffset& scroll_offset) {
1389   DCHECK(IsActive());
1390   if (scroll_offset_->SetCurrent(scroll_offset))
1391     DidUpdateScrollOffset(false);
1392 }
1393
1394 void LayerImpl::SetCurrentScrollOffsetFromDelegate(
1395     const gfx::ScrollOffset& scroll_offset) {
1396   DCHECK(IsActive());
1397   if (scroll_offset_->SetCurrent(scroll_offset))
1398     DidUpdateScrollOffset(true);
1399 }
1400
1401 void LayerImpl::PushScrollOffsetFromMainThread(
1402     const gfx::ScrollOffset& scroll_offset) {
1403   PushScrollOffset(&scroll_offset);
1404 }
1405
1406 void LayerImpl::PushScrollOffsetFromMainThreadAndClobberActiveValue(
1407     const gfx::ScrollOffset& scroll_offset) {
1408   scroll_offset_->set_clobber_active_value();
1409   PushScrollOffset(&scroll_offset);
1410 }
1411
1412 gfx::ScrollOffset LayerImpl::PullDeltaForMainThread() {
1413   // TODO(miletus): Remove all this temporary flooring machinery when
1414   // Blink fully supports fractional scrolls.
1415   gfx::ScrollOffset current_offset = CurrentScrollOffset();
1416   gfx::ScrollOffset current_delta = IsActive()
1417       ? scroll_offset_->Delta()
1418       : scroll_offset_->PendingDelta().get();
1419   gfx::ScrollOffset floored_delta(floor(current_delta.x()),
1420                                   floor(current_delta.y()));
1421   gfx::ScrollOffset diff_delta = floored_delta - current_delta;
1422   gfx::ScrollOffset tmp_offset = current_offset + diff_delta;
1423   scroll_offset_->SetCurrent(tmp_offset);
1424   gfx::ScrollOffset delta = scroll_offset_->PullDeltaForMainThread();
1425   scroll_offset_->SetCurrent(current_offset);
1426   return delta;
1427 }
1428
1429 gfx::ScrollOffset LayerImpl::CurrentScrollOffset() const {
1430   return scroll_offset_->Current(IsActive());
1431 }
1432
1433 gfx::Vector2dF LayerImpl::ScrollDelta() const {
1434   if (IsActive())
1435     return gfx::Vector2dF(scroll_offset_->Delta().x(),
1436                           scroll_offset_->Delta().y());
1437   else
1438     return gfx::Vector2dF(scroll_offset_->PendingDelta().get().x(),
1439                           scroll_offset_->PendingDelta().get().y());
1440 }
1441
1442 void LayerImpl::SetScrollDelta(const gfx::Vector2dF& delta) {
1443   DCHECK(IsActive());
1444   DCHECK(scrollable() || delta.IsZero());
1445   SetCurrentScrollOffset(scroll_offset_->ActiveBase() +
1446                          gfx::ScrollOffset(delta));
1447 }
1448
1449 gfx::ScrollOffset LayerImpl::BaseScrollOffset() const {
1450   if (IsActive())
1451     return scroll_offset_->ActiveBase();
1452   else
1453     return scroll_offset_->PendingBase();
1454 }
1455
1456 void LayerImpl::PushScrollOffset(const gfx::ScrollOffset* scroll_offset) {
1457   DCHECK(scroll_offset || IsActive());
1458   bool changed = false;
1459   if (scroll_offset) {
1460     DCHECK(!IsActive() || !layer_tree_impl_->FindPendingTreeLayerById(id()));
1461     changed |= scroll_offset_->PushFromMainThread(*scroll_offset);
1462   }
1463   if (IsActive()) {
1464     changed |= scroll_offset_->PushPendingToActive();
1465   }
1466
1467   if (changed)
1468     DidUpdateScrollOffset(false);
1469 }
1470
1471 void LayerImpl::UpdatePropertyTreeScrollOffset() {
1472   // TODO(enne): in the future, scrolling should update the scroll tree
1473   // directly instead of going through layers.
1474   if (transform_tree_index_ != -1) {
1475     TransformTree& transform_tree =
1476         layer_tree_impl()->property_trees()->transform_tree;
1477     TransformNode* node = transform_tree.Node(transform_tree_index_);
1478     gfx::ScrollOffset current_offset = scroll_offset_->Current(IsActive());
1479     if (node->data.scroll_offset != current_offset) {
1480       node->data.scroll_offset = current_offset;
1481       node->data.needs_local_transform_update = true;
1482       transform_tree.set_needs_update(true);
1483     }
1484   }
1485 }
1486
1487 void LayerImpl::DidUpdateScrollOffset(bool is_from_root_delegate) {
1488   DCHECK(scroll_offset_);
1489
1490   if (!is_from_root_delegate)
1491     layer_tree_impl()->DidUpdateScrollOffset(id());
1492   NoteLayerPropertyChangedForSubtree();
1493   ScrollbarParametersDidChange(false);
1494
1495   UpdatePropertyTreeScrollOffset();
1496
1497   // Inform the pending twin that a property changed.
1498   if (layer_tree_impl()->IsActiveTree()) {
1499     LayerImpl* pending_twin = layer_tree_impl()->FindPendingTreeLayerById(id());
1500     if (pending_twin)
1501       pending_twin->DidUpdateScrollOffset(is_from_root_delegate);
1502   }
1503 }
1504
1505 void LayerImpl::SetDoubleSided(bool double_sided) {
1506   if (double_sided_ == double_sided)
1507     return;
1508
1509   double_sided_ = double_sided;
1510   NoteLayerPropertyChangedForSubtree();
1511 }
1512
1513 SimpleEnclosedRegion LayerImpl::VisibleOpaqueRegion() const {
1514   if (contents_opaque())
1515     return SimpleEnclosedRegion(visible_layer_rect());
1516   return SimpleEnclosedRegion();
1517 }
1518
1519 void LayerImpl::DidBeginTracing() {}
1520
1521 void LayerImpl::ReleaseResources() {}
1522
1523 void LayerImpl::RecreateResources() {
1524 }
1525
1526 gfx::ScrollOffset LayerImpl::MaxScrollOffset() const {
1527   if (!scroll_clip_layer_ || bounds().IsEmpty())
1528     return gfx::ScrollOffset();
1529
1530   LayerImpl const* page_scale_layer = layer_tree_impl()->PageScaleLayer();
1531   DCHECK(this != page_scale_layer);
1532   DCHECK(this != layer_tree_impl()->InnerViewportScrollLayer() ||
1533          IsContainerForFixedPositionLayers());
1534
1535   float scale_factor = 1.f;
1536   for (LayerImpl const* current_layer = this;
1537        current_layer != scroll_clip_layer_->parent();
1538        current_layer = current_layer->parent()) {
1539     if (current_layer == page_scale_layer)
1540       scale_factor = layer_tree_impl()->current_page_scale_factor();
1541   }
1542
1543   gfx::SizeF scaled_scroll_bounds =
1544       gfx::ToFlooredSize(gfx::ScaleSize(BoundsForScrolling(), scale_factor));
1545   scaled_scroll_bounds = gfx::ToFlooredSize(scaled_scroll_bounds);
1546
1547   gfx::ScrollOffset max_offset(
1548       scaled_scroll_bounds.width() - scroll_clip_layer_->bounds().width(),
1549       scaled_scroll_bounds.height() - scroll_clip_layer_->bounds().height());
1550   // We need the final scroll offset to be in CSS coords.
1551   max_offset.Scale(1 / scale_factor);
1552   max_offset.SetToMax(gfx::ScrollOffset());
1553   return max_offset;
1554 }
1555
1556 gfx::ScrollOffset LayerImpl::ClampScrollOffsetToLimits(
1557     gfx::ScrollOffset offset) const {
1558   offset.SetToMin(MaxScrollOffset());
1559   offset.SetToMax(gfx::ScrollOffset());
1560   return offset;
1561 }
1562
1563 gfx::Vector2dF LayerImpl::ClampScrollToMaxScrollOffset() {
1564   gfx::ScrollOffset old_offset = CurrentScrollOffset();
1565   gfx::ScrollOffset clamped_offset = ClampScrollOffsetToLimits(old_offset);
1566   gfx::Vector2dF delta = clamped_offset.DeltaFrom(old_offset);
1567   if (!delta.IsZero())
1568     ScrollBy(delta);
1569   return delta;
1570 }
1571
1572 void LayerImpl::SetScrollbarPosition(ScrollbarLayerImplBase* scrollbar_layer,
1573                                      LayerImpl* scrollbar_clip_layer,
1574                                      bool on_resize) const {
1575   DCHECK(scrollbar_layer);
1576   LayerImpl* page_scale_layer = layer_tree_impl()->PageScaleLayer();
1577
1578   DCHECK(this != page_scale_layer);
1579   DCHECK(scrollbar_clip_layer);
1580   gfx::RectF clip_rect(gfx::PointF(),
1581                        scrollbar_clip_layer->BoundsForScrolling());
1582
1583   // See comment in MaxScrollOffset() regarding the use of the content layer
1584   // bounds here.
1585   gfx::RectF scroll_rect(gfx::PointF(), BoundsForScrolling());
1586
1587   if (scroll_rect.size().IsEmpty())
1588     return;
1589
1590   gfx::ScrollOffset current_offset;
1591   for (LayerImpl const* current_layer = this;
1592        current_layer != scrollbar_clip_layer->parent();
1593        current_layer = current_layer->parent()) {
1594     current_offset += current_layer->CurrentScrollOffset();
1595     if (current_layer == page_scale_layer) {
1596       float scale_factor = layer_tree_impl()->current_page_scale_factor();
1597       current_offset.Scale(scale_factor);
1598       scroll_rect.Scale(scale_factor);
1599     }
1600   }
1601
1602   bool scrollbar_needs_animation = false;
1603   scrollbar_needs_animation |= scrollbar_layer->SetVerticalAdjust(
1604       scrollbar_clip_layer->bounds_delta().y());
1605   if (scrollbar_layer->orientation() == HORIZONTAL) {
1606     float visible_ratio = clip_rect.width() / scroll_rect.width();
1607     scrollbar_needs_animation |=
1608         scrollbar_layer->SetCurrentPos(current_offset.x());
1609     scrollbar_needs_animation |=
1610         scrollbar_layer->SetMaximum(scroll_rect.width() - clip_rect.width());
1611     scrollbar_needs_animation |=
1612         scrollbar_layer->SetVisibleToTotalLengthRatio(visible_ratio);
1613   } else {
1614     float visible_ratio = clip_rect.height() / scroll_rect.height();
1615     bool y_offset_did_change =
1616         scrollbar_layer->SetCurrentPos(current_offset.y());
1617     scrollbar_needs_animation |= y_offset_did_change;
1618     scrollbar_needs_animation |=
1619         scrollbar_layer->SetMaximum(scroll_rect.height() - clip_rect.height());
1620     scrollbar_needs_animation |=
1621         scrollbar_layer->SetVisibleToTotalLengthRatio(visible_ratio);
1622     if (y_offset_did_change && layer_tree_impl()->IsActiveTree() &&
1623         this == layer_tree_impl()->OuterViewportScrollLayer()) {
1624       TRACE_COUNTER_ID1("cc", "scroll_offset_y", this->id(),
1625                         current_offset.y());
1626     }
1627   }
1628   if (scrollbar_needs_animation) {
1629     layer_tree_impl()->set_needs_update_draw_properties();
1630     // TODO(wjmaclean) The scrollbar animator for the pinch-zoom scrollbars
1631     // should activate for every scroll on the main frame, not just the
1632     // scrolls that move the pinch virtual viewport (i.e. trigger from
1633     // either inner or outer viewport).
1634     if (scrollbar_animation_controller_) {
1635       // Non-overlay scrollbars shouldn't trigger animations.
1636       if (scrollbar_layer->is_overlay_scrollbar())
1637         scrollbar_animation_controller_->DidScrollUpdate(on_resize);
1638     }
1639   }
1640 }
1641
1642 void LayerImpl::DidBecomeActive() {
1643   if (layer_tree_impl_->settings().scrollbar_animator ==
1644       LayerTreeSettings::NO_ANIMATOR) {
1645     return;
1646   }
1647
1648   bool need_scrollbar_animation_controller = scrollable() && scrollbars_;
1649   if (!need_scrollbar_animation_controller) {
1650     scrollbar_animation_controller_ = nullptr;
1651     return;
1652   }
1653
1654   if (scrollbar_animation_controller_)
1655     return;
1656
1657   scrollbar_animation_controller_ =
1658       layer_tree_impl_->CreateScrollbarAnimationController(this);
1659 }
1660
1661 void LayerImpl::ClearScrollbars() {
1662   if (!scrollbars_)
1663     return;
1664
1665   scrollbars_.reset(nullptr);
1666 }
1667
1668 void LayerImpl::AddScrollbar(ScrollbarLayerImplBase* layer) {
1669   DCHECK(layer);
1670   DCHECK(!scrollbars_ || scrollbars_->find(layer) == scrollbars_->end());
1671   if (!scrollbars_)
1672     scrollbars_.reset(new ScrollbarSet());
1673
1674   scrollbars_->insert(layer);
1675 }
1676
1677 void LayerImpl::RemoveScrollbar(ScrollbarLayerImplBase* layer) {
1678   DCHECK(scrollbars_);
1679   DCHECK(layer);
1680   DCHECK(scrollbars_->find(layer) != scrollbars_->end());
1681
1682   scrollbars_->erase(layer);
1683   if (scrollbars_->empty())
1684     scrollbars_ = nullptr;
1685 }
1686
1687 bool LayerImpl::HasScrollbar(ScrollbarOrientation orientation) const {
1688   if (!scrollbars_)
1689     return false;
1690
1691   for (ScrollbarSet::iterator it = scrollbars_->begin();
1692        it != scrollbars_->end();
1693        ++it)
1694     if ((*it)->orientation() == orientation)
1695       return true;
1696
1697   return false;
1698 }
1699
1700 void LayerImpl::ScrollbarParametersDidChange(bool on_resize) {
1701   if (!scrollbars_)
1702     return;
1703
1704   for (ScrollbarSet::iterator it = scrollbars_->begin();
1705        it != scrollbars_->end();
1706        ++it) {
1707     bool is_scroll_layer = (*it)->ScrollLayerId() == layer_id_;
1708     bool scroll_layer_resized = is_scroll_layer && on_resize;
1709     (*it)->ScrollbarParametersDidChange(scroll_layer_resized);
1710   }
1711 }
1712
1713 void LayerImpl::SetNeedsPushProperties() {
1714   if (needs_push_properties_)
1715     return;
1716   if (!parent_should_know_need_push_properties() && parent_)
1717     parent_->AddDependentNeedsPushProperties();
1718   needs_push_properties_ = true;
1719 }
1720
1721 void LayerImpl::AddDependentNeedsPushProperties() {
1722   DCHECK_GE(num_dependents_need_push_properties_, 0);
1723
1724   if (!parent_should_know_need_push_properties() && parent_)
1725     parent_->AddDependentNeedsPushProperties();
1726
1727   num_dependents_need_push_properties_++;
1728 }
1729
1730 void LayerImpl::RemoveDependentNeedsPushProperties() {
1731   num_dependents_need_push_properties_--;
1732   DCHECK_GE(num_dependents_need_push_properties_, 0);
1733
1734   if (!parent_should_know_need_push_properties() && parent_)
1735       parent_->RemoveDependentNeedsPushProperties();
1736 }
1737
1738 void LayerImpl::GetAllPrioritizedTilesForTracing(
1739     std::vector<PrioritizedTile>* prioritized_tiles) const {
1740 }
1741
1742 void LayerImpl::AsValueInto(base::trace_event::TracedValue* state) const {
1743   TracedValue::MakeDictIntoImplicitSnapshotWithCategory(
1744       TRACE_DISABLED_BY_DEFAULT("cc.debug"),
1745       state,
1746       "cc::LayerImpl",
1747       LayerTypeAsString(),
1748       this);
1749   state->SetInteger("layer_id", id());
1750   MathUtil::AddToTracedValue("bounds", bounds_, state);
1751
1752   state->SetDouble("opacity", opacity());
1753
1754   MathUtil::AddToTracedValue("position", position_, state);
1755
1756   state->SetInteger("draws_content", DrawsContent());
1757   state->SetInteger("gpu_memory_usage",
1758                     base::saturated_cast<int>(GPUMemoryUsageInBytes()));
1759
1760   MathUtil::AddToTracedValue(
1761       "scroll_offset", scroll_offset_ ? scroll_offset_->Current(IsActive())
1762                                       : gfx::ScrollOffset(),
1763       state);
1764
1765   MathUtil::AddToTracedValue("transform_origin", transform_origin_, state);
1766
1767   bool clipped;
1768   gfx::QuadF layer_quad = MathUtil::MapQuad(
1769       screen_space_transform(), gfx::QuadF(gfx::Rect(bounds())), &clipped);
1770   MathUtil::AddToTracedValue("layer_quad", layer_quad, state);
1771   if (!touch_event_handler_region_.IsEmpty()) {
1772     state->BeginArray("touch_event_handler_region");
1773     touch_event_handler_region_.AsValueInto(state);
1774     state->EndArray();
1775   }
1776   if (have_wheel_event_handlers_) {
1777     gfx::Rect wheel_rect(bounds());
1778     Region wheel_region(wheel_rect);
1779     state->BeginArray("wheel_event_handler_region");
1780     wheel_region.AsValueInto(state);
1781     state->EndArray();
1782   }
1783   if (have_scroll_event_handlers_) {
1784     gfx::Rect scroll_rect(bounds());
1785     Region scroll_region(scroll_rect);
1786     state->BeginArray("scroll_event_handler_region");
1787     scroll_region.AsValueInto(state);
1788     state->EndArray();
1789   }
1790   if (!non_fast_scrollable_region_.IsEmpty()) {
1791     state->BeginArray("non_fast_scrollable_region");
1792     non_fast_scrollable_region_.AsValueInto(state);
1793     state->EndArray();
1794   }
1795   if (scroll_blocks_on_) {
1796     state->SetInteger("scroll_blocks_on", scroll_blocks_on_);
1797   }
1798
1799   state->BeginArray("children");
1800   for (size_t i = 0; i < children_.size(); ++i) {
1801     state->BeginDictionary();
1802     children_[i]->AsValueInto(state);
1803     state->EndDictionary();
1804   }
1805   state->EndArray();
1806   if (mask_layer_) {
1807     state->BeginDictionary("mask_layer");
1808     mask_layer_->AsValueInto(state);
1809     state->EndDictionary();
1810   }
1811   if (replica_layer_) {
1812     state->BeginDictionary("replica_layer");
1813     replica_layer_->AsValueInto(state);
1814     state->EndDictionary();
1815   }
1816
1817   if (scroll_parent_)
1818     state->SetInteger("scroll_parent", scroll_parent_->id());
1819
1820   if (clip_parent_)
1821     state->SetInteger("clip_parent", clip_parent_->id());
1822
1823   state->SetBoolean("can_use_lcd_text", can_use_lcd_text());
1824   state->SetBoolean("contents_opaque", contents_opaque());
1825
1826   state->SetBoolean(
1827       "has_animation_bounds",
1828       layer_animation_controller_
1829           ? layer_animation_controller_->HasAnimationThatInflatesBounds()
1830           : layer_tree_impl_->HasAnimationThatInflatesBounds(this));
1831
1832   gfx::BoxF box;
1833   if (LayerUtils::GetAnimationBounds(*this, &box))
1834     MathUtil::AddToTracedValue("animation_bounds", box, state);
1835
1836   if (debug_info_.get()) {
1837     std::string str;
1838     debug_info_->AppendAsTraceFormat(&str);
1839     base::JSONReader json_reader;
1840     scoped_ptr<base::Value> debug_info_value(json_reader.ReadToValue(str));
1841
1842     if (debug_info_value->IsType(base::Value::TYPE_DICTIONARY)) {
1843       base::DictionaryValue* dictionary_value = nullptr;
1844       bool converted_to_dictionary =
1845           debug_info_value->GetAsDictionary(&dictionary_value);
1846       DCHECK(converted_to_dictionary);
1847       for (base::DictionaryValue::Iterator it(*dictionary_value); !it.IsAtEnd();
1848            it.Advance()) {
1849         state->SetValue(it.key().data(), it.value().CreateDeepCopy());
1850       }
1851     } else {
1852       NOTREACHED();
1853     }
1854   }
1855
1856   if (!frame_timing_requests_.empty()) {
1857     state->BeginArray("frame_timing_requests");
1858     for (const auto& request : frame_timing_requests_) {
1859       state->BeginDictionary();
1860       state->SetInteger("request_id", request.id());
1861       MathUtil::AddToTracedValue("request_rect", request.rect(), state);
1862       state->EndDictionary();
1863     }
1864     state->EndArray();
1865   }
1866 }
1867
1868 bool LayerImpl::IsDrawnRenderSurfaceLayerListMember() const {
1869   return draw_properties_.last_drawn_render_surface_layer_list_id ==
1870          layer_tree_impl_->current_render_surface_list_id();
1871 }
1872
1873 size_t LayerImpl::GPUMemoryUsageInBytes() const { return 0; }
1874
1875 void LayerImpl::RunMicroBenchmark(MicroBenchmarkImpl* benchmark) {
1876   benchmark->RunOnLayer(this);
1877 }
1878
1879 int LayerImpl::NumDescendantsThatDrawContent() const {
1880   return num_descendants_that_draw_content_;
1881 }
1882
1883 void LayerImpl::NotifyAnimationFinished(
1884     base::TimeTicks monotonic_time,
1885     Animation::TargetProperty target_property,
1886     int group) {
1887   if (target_property == Animation::SCROLL_OFFSET)
1888     layer_tree_impl_->InputScrollAnimationFinished();
1889 }
1890
1891 void LayerImpl::SetHasRenderSurface(bool should_have_render_surface) {
1892   if (!!render_surface() == should_have_render_surface)
1893     return;
1894
1895   SetNeedsPushProperties();
1896   layer_tree_impl()->set_needs_update_draw_properties();
1897   if (should_have_render_surface) {
1898     render_surface_ = make_scoped_ptr(new RenderSurfaceImpl(this));
1899     return;
1900   }
1901   render_surface_.reset();
1902 }
1903
1904 Region LayerImpl::GetInvalidationRegion() {
1905   return Region(update_rect_);
1906 }
1907
1908 gfx::Rect LayerImpl::GetEnclosingRectInTargetSpace() const {
1909   return MathUtil::MapEnclosingClippedRect(
1910       draw_properties_.target_space_transform, gfx::Rect(bounds()));
1911 }
1912
1913 gfx::Rect LayerImpl::GetScaledEnclosingRectInTargetSpace(float scale) const {
1914   gfx::Transform scaled_draw_transform =
1915       draw_properties_.target_space_transform;
1916   scaled_draw_transform.Scale(SK_MScalar1 / scale, SK_MScalar1 / scale);
1917   gfx::Size scaled_bounds = gfx::ToCeiledSize(gfx::ScaleSize(bounds(), scale));
1918   return MathUtil::MapEnclosingClippedRect(scaled_draw_transform,
1919                                            gfx::Rect(scaled_bounds));
1920 }
1921
1922 float LayerImpl::GetIdealContentsScale() const {
1923   float page_scale = IsAffectedByPageScale()
1924                          ? layer_tree_impl()->current_page_scale_factor()
1925                          : 1.f;
1926   float device_scale = layer_tree_impl()->device_scale_factor();
1927
1928   float default_scale = page_scale * device_scale;
1929   if (!layer_tree_impl()
1930            ->settings()
1931            .layer_transforms_should_scale_layer_contents) {
1932     return default_scale;
1933   }
1934
1935   // TODO(enne): the transform needs to come from property trees instead of
1936   // draw properties.
1937   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
1938       draw_properties().target_space_transform, default_scale);
1939   return std::max(transform_scales.x(), transform_scales.y());
1940 }
1941
1942 }  // namespace cc