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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 */
#include "2D.h"
#include <vector>
namespace mozilla {
namespace gfx {
struct FlatPathOp {
enum OpType {
OpType mType;
Point mPoint;
class FlattenedPath : public PathSink {
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);
Float mCachedLength = 0.0f;
bool mCalculatedLength = false;
std::vector<FlatPathOp> mPathOps;
// Used to accelerate ComputePointAtLength for the common case of iterating
// forward along the path.
struct {
uint32_t mIndex = 0;
Float mLength = 0.0f;
Point mCurrentPoint;
Point mLastPointSinceMove;
void Reset() {
mIndex = 0;
mLength = 0.0f;
mCurrentPoint = Point();
mLastPointSinceMove = Point();
} mCursor;
} // namespace gfx
} // namespace mozilla