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/*
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2009 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef LayoutSVGTextPath_h
#define LayoutSVGTextPath_h
#include "core/layout/svg/LayoutSVGInline.h"
#include "wtf/PtrUtil.h"
#include <memory>
namespace blink {
// This class maps a 1D location in the "path space"; [0, path length] to a
// (2D) point on the path and provides the normal (angle from the x-axis) for
// said point.
class PathPositionMapper {
USING_FAST_MALLOC(PathPositionMapper);
public:
static std::unique_ptr<PathPositionMapper> create(const Path& path) {
return WTF::wrapUnique(new PathPositionMapper(path));
}
enum PositionType {
OnPath,
BeforePath,
AfterPath,
};
PositionType pointAndNormalAtLength(float length, FloatPoint&, float& angle);
float length() const { return m_pathLength; }
private:
explicit PathPositionMapper(const Path&);
Path::PositionCalculator m_positionCalculator;
float m_pathLength;
};
class LayoutSVGTextPath final : public LayoutSVGInline {
public:
explicit LayoutSVGTextPath(Element*);
std::unique_ptr<PathPositionMapper> layoutPath() const;
float calculateStartOffset(float) const;
bool isChildAllowed(LayoutObject*, const ComputedStyle&) const override;
bool isOfType(LayoutObjectType type) const override {
return type == LayoutObjectSVGTextPath || LayoutSVGInline::isOfType(type);
}
const char* name() const override { return "LayoutSVGTextPath"; }
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGTextPath, isSVGTextPath());
} // namespace blink
#endif // LayoutSVGTextPath_h
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