mirror of https://gitee.com/openkylin/firefox.git
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef DOM_SVG_SVGPATHDATAPARSER_H_
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#define DOM_SVG_SVGPATHDATAPARSER_H_
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#include "mozilla/Attributes.h"
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#include "mozilla/gfx/Point.h"
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#include "SVGDataParser.h"
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namespace mozilla {
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class SVGPathData;
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////////////////////////////////////////////////////////////////////////
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// SVGPathDataParser: a simple recursive descent parser that builds
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// DOMSVGPathSegs from path data strings. The grammar for path data
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// can be found in SVG CR 20001102, chapter 8.
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class SVGPathDataParser : public SVGDataParser {
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public:
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SVGPathDataParser(const nsAString& aValue, mozilla::SVGPathData* aList)
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: SVGDataParser(aValue), mPathSegList(aList) {
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MOZ_ASSERT(aList, "null path data");
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}
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bool Parse();
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private:
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bool ParseCoordPair(float& aX, float& aY);
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bool ParseFlag(bool& aFlag);
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bool ParsePath();
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bool IsStartOfSubPath() const;
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bool ParseSubPath();
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bool ParseSubPathElements();
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bool ParseSubPathElement(char16_t aCommandType, bool aAbsCoords);
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bool ParseMoveto();
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bool ParseClosePath();
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bool ParseLineto(bool aAbsCoords);
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bool ParseHorizontalLineto(bool aAbsCoords);
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bool ParseVerticalLineto(bool aAbsCoords);
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bool ParseCurveto(bool aAbsCoords);
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bool ParseSmoothCurveto(bool aAbsCoords);
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bool ParseQuadBezierCurveto(bool aAbsCoords);
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bool ParseSmoothQuadBezierCurveto(bool aAbsCoords);
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bool ParseEllipticalArc(bool aAbsCoords);
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mozilla::SVGPathData* const mPathSegList;
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};
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class SVGArcConverter {
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using Point = mozilla::gfx::Point;
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public:
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SVGArcConverter(const Point& from, const Point& to, const Point& radii,
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double angle, bool largeArcFlag, bool sweepFlag);
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bool GetNextSegment(Point* cp1, Point* cp2, Point* to);
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protected:
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int32_t mNumSegs, mSegIndex;
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double mTheta, mDelta, mT;
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double mSinPhi, mCosPhi;
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double mRx, mRy;
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Point mFrom, mC;
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};
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} // namespace mozilla
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#endif // DOM_SVG_SVGPATHDATAPARSER_H_
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