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// Copyright 2016 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_MATRIX_TRANSFORM_NODE_H_
#define COBALT_RENDER_TREE_MATRIX_TRANSFORM_NODE_H_
#include <algorithm>
#include <vector>
#include "base/compiler_specific.h"
#include "cobalt/base/type_id.h"
#include "cobalt/math/matrix3_f.h"
#include "cobalt/render_tree/node.h"
namespace cobalt {
namespace render_tree {
// A MatrixTransformNode applies a specified affine matrix transform,
// |transform| to a specified sub render tree node, |source|.
class MatrixTransformNode : public Node {
public:
struct Builder {
Builder(const Builder&) = default;
Builder(const scoped_refptr<Node>& source, const math::Matrix3F& transform)
: source(source), transform(transform) {}
bool operator==(const Builder& other) const {
return source == other.source && transform == other.transform;
}
// The subtree that will be rendered with |transform| applied to it.
scoped_refptr<Node> source;
// The matrix transform that will be applied to the subtree. It is an
// affine 3x3 matrix to be applied to 2D points.
math::Matrix3F transform;
};
// Forwarding constructor to the set of Builder constructors.
template <typename... Args>
MatrixTransformNode(Args&&... args) : data_(std::forward<Args>(args)...) {}
void Accept(NodeVisitor* visitor) override;
math::RectF GetBounds() const override;
base::TypeId GetTypeId() const override {
return base::GetTypeId<MatrixTransformNode>();
}
const Builder& data() const { return data_; }
private:
const Builder data_;
};
} // namespace render_tree
} // namespace cobalt
#endif // COBALT_RENDER_TREE_MATRIX_TRANSFORM_NODE_H_