1/*
2 * Copyright 2012 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7#ifndef SkPathWriter_DEFINED
8#define SkPathWriter_DEFINED
9
10#include "include/core/SkPath.h"
11#include "include/private/SkTArray.h"
12#include "include/private/SkTDArray.h"
13
14class SkOpPtT;
15
16// Construct the path one contour at a time.
17// If the contour is closed, copy it to the final output.
18// Otherwise, keep the partial contour for later assembly.
19
20class SkPathWriter {
21public:
22 SkPathWriter(SkPath& path);
23 void assemble();
24 void conicTo(const SkPoint& pt1, const SkOpPtT* pt2, SkScalar weight);
25 void cubicTo(const SkPoint& pt1, const SkPoint& pt2, const SkOpPtT* pt3);
26 bool deferredLine(const SkOpPtT* pt);
27 void deferredMove(const SkOpPtT* pt);
28 void finishContour();
29 bool hasMove() const { return !fFirstPtT; }
30 void init();
31 bool isClosed() const;
32 const SkPath* nativePath() const { return fPathPtr; }
33 void quadTo(const SkPoint& pt1, const SkOpPtT* pt2);
34
35private:
36 bool changedSlopes(const SkOpPtT* pt) const;
37 void close();
38 const SkTDArray<const SkOpPtT*>& endPtTs() const { return fEndPtTs; }
39 void lineTo();
40 bool matchedLast(const SkOpPtT*) const;
41 void moveTo();
42 const SkTArray<SkPath>& partials() const { return fPartials; }
43 bool someAssemblyRequired();
44 SkPoint update(const SkOpPtT* pt);
45
46 SkPath fCurrent; // contour under construction
47 SkTArray<SkPath> fPartials; // contours with mismatched starts and ends
48 SkTDArray<const SkOpPtT*> fEndPtTs; // possible pt values for partial starts and ends
49 SkPath* fPathPtr; // closed contours are written here
50 const SkOpPtT* fDefer[2]; // [0] deferred move, [1] deferred line
51 const SkOpPtT* fFirstPtT; // first in current contour
52};
53
54#endif /* defined(__PathOps__SkPathWriter__) */
55