gfx/2d/PathAnalysis.h
author Edouard Oger <eoger@fastmail.com>
Thu, 22 Feb 2018 16:30:39 +0800
changeset 459331 157f93b585b18e810942d3fc421b8dc9327b4419
parent 451029 3d28ca7c05d8f9ba3ba6ff1cd5449dce42ae95c1
child 505383 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1439777 p2 - Remove weave:ui:* related code. r=markh,tcsc MozReview-Commit-ID: D1H36YeiJCS

/* -*- 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/. */

#include "2D.h"
#include <vector>

namespace mozilla {
namespace gfx {

struct FlatPathOp
{
  enum OpType {
    OP_MOVETO,
    OP_LINETO,
  };

  OpType mType;
  Point mPoint;
};

class FlattenedPath : public PathSink
{
public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(FlattenedPath, override)

  FlattenedPath() : mCachedLength(0)
                  , mCalculatedLength(false)
  {
  }

  virtual void MoveTo(const Point &aPoint) override;
  virtual void LineTo(const Point &aPoint) override;
  virtual void BezierTo(const Point &aCP1,
                        const Point &aCP2,
                        const Point &aCP3) override;
  virtual void QuadraticBezierTo(const Point &aCP1,
                                 const Point &aCP2) override;
  virtual void Close() override;
  virtual void Arc(const Point &aOrigin, float aRadius, float aStartAngle,
                   float aEndAngle, bool aAntiClockwise = false) override;

  virtual Point CurrentPoint() const override { return mPathOps.empty() ? Point() : mPathOps[mPathOps.size() - 1].mPoint; }

  Float ComputeLength();
  Point ComputePointAtLength(Float aLength, Point *aTangent);

private:
  Float mCachedLength;
  bool mCalculatedLength;
  Point mLastMove;

  std::vector<FlatPathOp> mPathOps;
};

} // namespace gfx
} // namespace mozilla