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