src/pathops/SkPathWriter.h

/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#ifndef SkPathWriter_DEFINED
#define SkPathWriter_DEFINED

#include "include/core/SkPath.h"
#include "include/core/SkPathBuilder.h"
#include "include/core/SkPoint.h"
#include "include/core/SkScalar.h"
#include "include/private/SkTArray.h"

class SkOpPtT;

// Construct the path one contour at a time.
// If the contour is closed, copy it to the final output.
// Otherwise, keep the partial contour for later assembly.

class SkPathWriter {
public:
    SkPathWriter(SkPathFillType);
    void assemble();
    void conicTo(const SkPoint& pt1, const SkOpPtT* pt2, SkScalar weight);
    void cubicTo(const SkPoint& pt1, const SkPoint& pt2, const SkOpPtT* pt3);
    bool deferredLine(const SkOpPtT* pt);
    void deferredMove(const SkOpPtT* pt);
    void finishContour();
    bool hasMove() const { return !fFirstPtT; }
    void init();
    bool isClosed() const;
    SkPath nativePath() { return fBuilder.detach(); }
    void quadTo(const SkPoint& pt1, const SkOpPtT* pt2);

private:
    bool changedSlopes(const SkOpPtT* pt) const;
    void close();
    void lineTo();
    bool matchedLast(const SkOpPtT*) const;
    void moveTo();
    bool someAssemblyRequired();
    SkPoint update(const SkOpPtT* pt);

    SkPathBuilder fBuilder;
    SkPathBuilder fCurrent;  // contour under construction
    skia_private::TArray<SkPathBuilder> fPartials;   // contours with mismatched starts and ends
    skia_private::TArray<const SkOpPtT*> fEndPtTs;  // possible pt values for partial starts and ends
    const SkOpPtT* fDefer[2];  // [0] deferred move, [1] deferred line
    const SkOpPtT* fFirstPtT;  // first in current contour
};

#endif /* defined(__PathOps__SkPathWriter__) */