| // 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 "third_party/blink/renderer/core/paint/compositing/compositing_inputs_root.h" |
| |
| #include "third_party/blink/renderer/core/paint/paint_layer.h" |
| |
| namespace blink { |
| |
| void CompositingInputsRoot::Update(PaintLayer* new_root_layer) { |
| DCHECK(new_root_layer); |
| |
| if (!root_layer_) { |
| // This is the first time we call Update() so just let set the root layer. |
| root_layer_ = new_root_layer; |
| return; |
| } |
| |
| if (root_layer_ == new_root_layer) |
| return; |
| |
| PaintLayer* common_ancestor = |
| const_cast<PaintLayer*>(root_layer_->CommonAncestor(new_root_layer)); |
| if (!common_ancestor) |
| common_ancestor = const_cast<PaintLayer*>(root_layer_->Root()); |
| |
| root_layer_->SetChildNeedsCompositingInputsUpdateUpToAncestor( |
| common_ancestor); |
| new_root_layer->SetChildNeedsCompositingInputsUpdateUpToAncestor( |
| common_ancestor); |
| |
| root_layer_ = common_ancestor; |
| } |
| |
| } // namespace blink |
