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 SkOpEdgeBuilder_DEFINED
8 #define SkOpEdgeBuilder_DEFINED
9 
10 #include "SkOpContour.h"
11 #include "SkPathWriter.h"
12 
13 class SkOpEdgeBuilder {
14 public:
15     SkOpEdgeBuilder(const SkPathWriter& path, SkOpContourHead* contours2,
16             SkOpGlobalState* globalState)
17         : fGlobalState(globalState)
18         , fPath(path.nativePath())
19         , fContourBuilder(contours2)
20         , fContoursHead(contours2)
21         , fAllowOpenContours(true) {
22         init();
23     }
24 
25     SkOpEdgeBuilder(const SkPath& path, SkOpContourHead* contours2, SkOpGlobalState* globalState)
26         : fGlobalState(globalState)
27         , fPath(&path)
28         , fContourBuilder(contours2)
29         , fContoursHead(contours2)
30         , fAllowOpenContours(false) {
31         init();
32     }
33 
34     void addOperand(const SkPath& path);
35 
36     void complete() {
37         fContourBuilder.flush();
38         SkOpContour* contour = fContourBuilder.contour();
39         if (contour && contour->count()) {
40             contour->complete();
41             fContourBuilder.setContour(nullptr);
42         }
43     }
44 
45     bool finish();
46 
47     const SkOpContour* head() const {
48         return fContoursHead;
49     }
50 
51     void init();
52     bool unparseable() const { return fUnparseable; }
53     SkPathOpsMask xorMask() const { return fXorMask[fOperand]; }
54 
55 private:
56     void closeContour(const SkPoint& curveEnd, const SkPoint& curveStart);
57     bool close();
58     int preFetch();
59     bool walk();
60 
61     SkOpGlobalState* fGlobalState;
62     const SkPath* fPath;
63     SkTDArray<SkPoint> fPathPts;
64     SkTDArray<SkScalar> fWeights;
65     SkTDArray<uint8_t> fPathVerbs;
66     SkOpContourBuilder fContourBuilder;
67     SkOpContourHead* fContoursHead;
68     SkPathOpsMask fXorMask[2];
69     int fSecondHalf;
70     bool fOperand;
71     bool fAllowOpenContours;
72     bool fUnparseable;
73 };
74 
75 #endif
76