SVGPathDataParser.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef DOM_SVG_SVGPATHDATAPARSER_H_

#define DOM_SVG_SVGPATHDATAPARSER_H_

#include "mozilla/Attributes.h"

#include "mozilla/gfx/Point.h"

#include "SVGDataParser.h"

namespace mozilla {

class SVGPathData;

////////////////////////////////////////////////////////////////////////

// SVGPathDataParser: a simple recursive descent parser that builds

// DOMSVGPathSegs from path data strings. The grammar for path data

// can be found in SVG CR 20001102, chapter 8.

class SVGPathDataParser : public SVGDataParser {

 public:

  SVGPathDataParser(const nsAString& aValue, mozilla::SVGPathData* aList)

      : SVGDataParser(aValue), mPathSegList(aList) {

    MOZ_ASSERT(aList, "null path data");

  bool Parse();

 private:

  bool ParseCoordPair(float& aX, float& aY);

  bool ParseFlag(bool& aFlag);

  bool ParsePath();

  bool IsStartOfSubPath() const;

  bool ParseSubPath();

  bool ParseSubPathElements();

  bool ParseSubPathElement(char16_t aCommandType, bool aAbsCoords);

  bool ParseMoveto();

  bool ParseClosePath();

  bool ParseLineto(bool aAbsCoords);

  bool ParseHorizontalLineto(bool aAbsCoords);

  bool ParseVerticalLineto(bool aAbsCoords);

  bool ParseCurveto(bool aAbsCoords);

  bool ParseSmoothCurveto(bool aAbsCoords);

  bool ParseQuadBezierCurveto(bool aAbsCoords);

  bool ParseSmoothQuadBezierCurveto(bool aAbsCoords);

  bool ParseEllipticalArc(bool aAbsCoords);

  mozilla::SVGPathData* const mPathSegList;

};

class SVGArcConverter {

  using Point = mozilla::gfx::Point;

 public:

  SVGArcConverter(const Point& from, const Point& to, const Point& radii,

                  double angle, bool largeArcFlag, bool sweepFlag);

  bool GetNextSegment(Point* cp1, Point* cp2, Point* to);

 protected:

  int32_t mNumSegs, mSegIndex;

  double mTheta, mDelta, mT;

  double mSinPhi, mCosPhi;

  double mRx, mRy;

  Point mFrom, mC;

};

}  // namespace mozilla

#endif  // DOM_SVG_SVGPATHDATAPARSER_H_