text: // Copyright 2019 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 <utility>
  
  #include "cc/layers/mirror_layer.h"
  
  #include "cc/layers/mirror_layer_impl.h"
  
  namespace cc {
  
  std::unique_ptr<LayerImpl> MirrorLayer::CreateLayerImpl(
      LayerTreeImpl* tree_impl) {
    return MirrorLayerImpl::Create(tree_impl, id());
  }
  
  void MirrorLayer::PushPropertiesTo(
      LayerImpl* layer,
      const CommitState& commit_state,
      const ThreadUnsafeCommitState& unsafe_state) {
    Layer::PushPropertiesTo(layer, commit_state, unsafe_state);
  
    auto* mirror_layer = static_cast<MirrorLayerImpl*>(layer);
    mirror_layer->SetMirroredLayerId(mirrored_layer_->id());
  }
  
  void MirrorLayer::SetLayerTreeHost(LayerTreeHost* host) {
  #if DCHECK_IS_ON()
    if (host && host != layer_tree_host()) {
      for (auto* p = parent(); p; p = p->parent())
        DCHECK_NE(p, mirrored_layer_.get());
    }
  #endif
  
    Layer::SetLayerTreeHost(host);
  }
  
  scoped_refptr<MirrorLayer> MirrorLayer::Create(
      scoped_refptr<Layer> mirrored_layer) {
    return base::WrapRefCounted(new MirrorLayer(std::move(mirrored_layer)));
  }
  
  MirrorLayer::MirrorLayer(scoped_refptr<Layer> mirrored_layer)
      : mirrored_layer_(std::move(mirrored_layer)) {
    DCHECK(mirrored_layer_);
    mirrored_layer_->IncrementMirrorCount();
  }
  
  MirrorLayer::~MirrorLayer() {
    mirrored_layer_->DecrementMirrorCount();
  }
  
  }  // namespace cc
  