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      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 
     15 class SkIntersectionHelper {
     16 public:
     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 
    106 private:
    107     SkOpSegment* fSegment;
    108 };
    109