Compute if a layer is drawn without LayerTree hierarchy

cc/layers/layer.cc

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/layer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 80 matching lines @@
       blend_mode_(SkXfermode::kSrcOver_Mode),
       draw_blend_mode_(SkXfermode::kSrcOver_Mode),
       scroll_parent_(nullptr),
       layer_or_descendant_is_drawn_tracker_(0),
       sorted_for_recursion_tracker_(0),
       visited_tracker_(0),
       clip_parent_(nullptr),
       replica_layer_(nullptr),
       client_(nullptr),
       num_unclipped_descendants_(0),
-      frame_timing_requests_dirty_(false),
-      is_hidden_from_property_trees_(false) {
+      frame_timing_requests_dirty_(false) {
   if (!settings.use_compositor_animation_timelines) {
     layer_animation_controller_ = LayerAnimationController::Create(layer_id_);
     layer_animation_controller_->AddValueObserver(this);
     layer_animation_controller_->set_value_provider(this);
   }
 }
 
 Layer::~Layer() {
   // Our parent should be holding a reference to us so there should be no
   // way for us to be destroyed while we still have a parent.
@@ skipping 417 matching lines @@
 }
 
 void Layer::SetOpacity(float opacity) {
   DCHECK(IsPropertyChangeAllowed());
   if (opacity_ == opacity)
     return;
   opacity_ = opacity;
   SetNeedsCommit();
 }
 
+float Layer::EffectiveOpacity() const {
+  return hide_layer_and_subtree_ ? 0.f : opacity_;
+}
+
 bool Layer::OpacityIsAnimating() const {
   DCHECK(layer_tree_host_);
   return layer_animation_controller_
              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
                    Animation::OPACITY,
                    LayerAnimationController::ObserverType::ACTIVE)
              : layer_tree_host_->IsAnimatingOpacityProperty(this);
 }
 
 bool Layer::HasPotentiallyRunningOpacityAnimation() const {
@@ skipping 681 matching lines @@
     layer->SetTransformAndInvertibility(transform_, transform_is_invertible_);
   DCHECK(!(TransformIsAnimating() && layer->TransformIsAnimatingOnImplOnly()));
   layer->Set3dSortingContextId(sorting_context_id_);
   layer->SetNumDescendantsThatDrawContent(num_descendants_that_draw_content_);
 
   layer->SetScrollClipLayer(scroll_clip_layer_id_);
   layer->set_user_scrollable_horizontal(user_scrollable_horizontal_);
   layer->set_user_scrollable_vertical(user_scrollable_vertical_);
   layer->SetElementId(element_id_);
   layer->SetMutableProperties(mutable_properties_);
-  layer->set_is_hidden_from_property_trees(is_hidden_from_property_trees_);
 
   LayerImpl* scroll_parent = nullptr;
   if (scroll_parent_) {
     scroll_parent = layer->layer_tree_impl()->LayerById(scroll_parent_->id());
     DCHECK(scroll_parent);
   }
 
   layer->SetScrollParent(scroll_parent);
   if (scroll_children_) {
     std::set<LayerImpl*>* scroll_children = new std::set<LayerImpl*>;
@@ skipping 779 matching lines @@
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 gfx::Transform Layer::screen_space_transform() const {
   DCHECK_NE(transform_tree_index_, -1);
   return ScreenSpaceTransformFromPropertyTrees(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc