| // Copyright 2014 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef COBALT_RENDER_TREE_NODE_H_ |
| #define COBALT_RENDER_TREE_NODE_H_ |
| |
| #include "base/memory/ref_counted.h" |
| #include "cobalt/base/type_id.h" |
| #include "cobalt/math/rect_f.h" |
| |
| namespace cobalt { |
| namespace render_tree { |
| |
| class NodeVisitor; |
| |
| // A base class of all objects that form a render tree. |
| class Node : public base::RefCountedThreadSafe<Node> { |
| public: |
| // A type-safe branching. |
| virtual void Accept(NodeVisitor* visitor) = 0; |
| |
| // Returns an axis-aligned bounding rectangle for this render tree node in |
| // units of pixels. |
| virtual math::RectF GetBounds() const = 0; |
| |
| // Returns an ID that is unique to the node type. This can be used to |
| // polymorphically identify what type a node is. |
| virtual base::TypeId GetTypeId() const = 0; |
| |
| // Number to help differentiate nodes. This is specific to the local process |
| // and is not deterministic. Node identifiers from different processes may |
| // overlap. This is intended to be used as a key when, for example, caching |
| // render results of nodes. |
| int64_t GetId() const { return node_id_; } |
| |
| protected: |
| Node(); |
| virtual ~Node() {} |
| friend class base::RefCountedThreadSafe<Node>; |
| |
| private: |
| int64_t node_id_; |
| }; |
| |
| } // namespace render_tree |
| } // namespace cobalt |
| |
| #endif // COBALT_RENDER_TREE_NODE_H_ |