Home | History | Annotate | Download | only in pathops 
      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 SkIntersectionHelper_DEFINED
      8 #define SkIntersectionHelper_DEFINED
      9 
     10 #include "SkOpContour.h"
     11 #include "SkOpSegment.h"
     12 #include "SkPath.h"
     13 
     14 #ifdef SK_DEBUG
     15 #include "SkPathOpsPoint.h"
     16 #endif
     17 
     18 class SkIntersectionHelper {
     19 public:
     20     enum SegmentType {
     21         kHorizontalLine_Segment = -1,
     22         kVerticalLine_Segment = 0,
     23         kLine_Segment = SkPath::kLine_Verb,
     24         kQuad_Segment = SkPath::kQuad_Verb,
     25         kConic_Segment = SkPath::kConic_Verb,
     26         kCubic_Segment = SkPath::kCubic_Verb,
     27     };
     28 
     29     bool advance() {
     30         fSegment = fSegment->next();
     31         return fSegment != nullptr;
     32     }
     33 
     34     SkScalar bottom() const {
     35         return bounds().fBottom;
     36     }
     37 
     38     const SkPathOpsBounds& bounds() const {
     39         return fSegment->bounds();
     40     }
     41 
     42     SkOpContour* contour() const {
     43         return fSegment->contour();
     44     }
     45 
     46     void init(SkOpContour* contour) {
     47         fSegment = contour->first();
     48     }
     49 
     50     SkScalar left() const {
     51         return bounds().fLeft;
     52     }
     53 
     54     const SkPoint* pts() const {
     55         return fSegment->pts();
     56     }
     57 
     58     SkScalar right() const {
     59         return bounds().fRight;
     60     }
     61 
     62     SkOpSegment* segment() const {
     63         return fSegment;
     64     }
     65 
     66     SegmentType segmentType() const {
     67         SegmentType type = (SegmentType) fSegment->verb();
     68         if (type != kLine_Segment) {
     69             return type;
     70         }
     71         if (fSegment->isHorizontal()) {
     72             return kHorizontalLine_Segment;
     73         }
     74         if (fSegment->isVertical()) {
     75             return kVerticalLine_Segment;
     76         }
     77         return kLine_Segment;
     78     }
     79 
     80     bool startAfter(const SkIntersectionHelper& after) {
     81         fSegment = after.fSegment->next();
     82         return fSegment != nullptr;
     83     }
     84 
     85     SkScalar top() const {
     86         return bounds().fTop;
     87     }
     88 
     89     SkScalar weight() const {
     90         return fSegment->weight();
     91     }
     92 
     93     SkScalar x() const {
     94         return bounds().fLeft;
     95     }
     96 
     97     bool xFlipped() const {
     98         return x() != pts()[0].fX;
     99     }
    100 
    101     SkScalar y() const {
    102         return bounds().fTop;
    103     }
    104 
    105     bool yFlipped() const {
    106         return y() != pts()[0].fY;
    107     }
    108 
    109 private:
    110     SkOpSegment* fSegment;
    111 };
    112 
    113 #endif
    114