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// Copyright 2014 The Cobalt Authors. 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_TEXT_NODE_H_
#define COBALT_RENDER_TREE_TEXT_NODE_H_
#include <string>
#include <vector>
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/optional.h"
#include "base/strings/string_piece.h"
#include "cobalt/base/type_id.h"
#include "cobalt/math/rect_f.h"
#include "cobalt/math/vector2d_f.h"
#include "cobalt/render_tree/color_rgba.h"
#include "cobalt/render_tree/glyph_buffer.h"
#include "cobalt/render_tree/node.h"
#include "cobalt/render_tree/shadow.h"
namespace cobalt {
namespace render_tree {
// A single line of text or a directional run as specified by Unicode
// Bidirectional Algorithm (http://www.unicode.org/reports/tr9/).
// When rendering the text node, the origin will horizontally be on the far left
// of the text, and vertically it will be on the text's baseline. This means
// that the text bounding box may cover area above and below the TextNode's
// origin.
class TextNode : public Node {
public:
struct Builder {
Builder(const Builder&) = default;
Builder(const math::Vector2dF& offset,
const scoped_refptr<GlyphBuffer>& glyph_buffer,
const ColorRGBA& color);
bool operator==(const Builder& other) const {
return offset == other.offset && glyph_buffer == other.glyph_buffer &&
color == other.color && shadows == other.shadows;
}
math::Vector2dF offset;
// All of the glyph data needed to render the text.
scoped_refptr<GlyphBuffer> glyph_buffer;
// The foreground color of the text.
ColorRGBA color;
// Shadows to be applied under the text. These will be drawn in
// back-to-front order, so the last shadow will be on the bottom.
base::Optional<std::vector<Shadow> > shadows;
};
// Forwarding constructor to the set of Builder constructors.
template <typename... Args>
TextNode(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<TextNode>();
}
const Builder& data() const { return data_; }
private:
const Builder data_;
};
} // namespace render_tree
} // namespace cobalt
#endif // COBALT_RENDER_TREE_TEXT_NODE_H_