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#include "SkOpContour.h"
8#include "SkOpSegment.h"
9#include "SkPath.h"
10
11#ifdef SK_DEBUG
12#include "SkPathOpsPoint.h"
13#endif
14
15class SkIntersectionHelper {
16public:
17    enum SegmentType {
18        kHorizontalLine_Segment = -1,
19        kVerticalLine_Segment = 0,
20        kLine_Segment = SkPath::kLine_Verb,
21        kQuad_Segment = SkPath::kQuad_Verb,
22        kConic_Segment = SkPath::kConic_Verb,
23        kCubic_Segment = SkPath::kCubic_Verb,
24    };
25
26    bool advance() {
27        fSegment = fSegment->next();
28        return fSegment != nullptr;
29    }
30
31    SkScalar bottom() const {
32        return bounds().fBottom;
33    }
34
35    const SkPathOpsBounds& bounds() const {
36        return fSegment->bounds();
37    }
38
39    SkOpContour* contour() const {
40        return fSegment->contour();
41    }
42
43    void init(SkOpContour* contour) {
44        fSegment = contour->first();
45    }
46
47    SkScalar left() const {
48        return bounds().fLeft;
49    }
50
51    const SkPoint* pts() const {
52        return fSegment->pts();
53    }
54
55    SkScalar right() const {
56        return bounds().fRight;
57    }
58
59    SkOpSegment* segment() const {
60        return fSegment;
61    }
62
63    SegmentType segmentType() const {
64        SegmentType type = (SegmentType) fSegment->verb();
65        if (type != kLine_Segment) {
66            return type;
67        }
68        if (fSegment->isHorizontal()) {
69            return kHorizontalLine_Segment;
70        }
71        if (fSegment->isVertical()) {
72            return kVerticalLine_Segment;
73        }
74        return kLine_Segment;
75    }
76
77    bool startAfter(const SkIntersectionHelper& after) {
78        fSegment = after.fSegment->next();
79        return fSegment != nullptr;
80    }
81
82    SkScalar top() const {
83        return bounds().fTop;
84    }
85
86    SkScalar weight() const {
87        return fSegment->weight();
88    }
89
90    SkScalar x() const {
91        return bounds().fLeft;
92    }
93
94    bool xFlipped() const {
95        return x() != pts()[0].fX;
96    }
97
98    SkScalar y() const {
99        return bounds().fTop;
100    }
101
102    bool yFlipped() const {
103        return y() != pts()[0].fY;
104    }
105
106private:
107    SkOpSegment* fSegment;
108};
109