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1 /* | 1 /* |
2 * Copyright 2016 Google Inc. | 2 * Copyright 2016 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkCurveMeasure_DEFINED | 8 #ifndef SkCurveMeasure_DEFINED |
9 #define SkCurveMeasure_DEFINED | 9 #define SkCurveMeasure_DEFINED |
10 | 10 |
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37 SkSegType fSegType; | 37 SkSegType fSegType; |
38 | 38 |
39 // precomputed coefficients for derivatives in Horner form | 39 // precomputed coefficients for derivatives in Horner form |
40 Sk8f xCoeff[3]; | 40 Sk8f xCoeff[3]; |
41 Sk8f yCoeff[3]; | 41 Sk8f yCoeff[3]; |
42 }; | 42 }; |
43 | 43 |
44 class SkCurveMeasure { | 44 class SkCurveMeasure { |
45 public: | 45 public: |
46 SkCurveMeasure() {} | 46 SkCurveMeasure() {} |
47 | |
48 // Almost exactly the same as in SkPath::Iter: | |
49 // kLine_SegType -> 2 points: start end | |
50 // kQuad_SegType -> 3 points: start control end | |
51 // kCubic_SegType -> 4 points: start control1 control2 end | |
52 // kConic_SegType -> 4 points: start control end (w, w) | |
53 // | |
54 // i.e. the only difference is that the conic's last point is a point | |
55 // consisting of the w value twice | |
56 SkCurveMeasure(const SkPoint* pts, SkSegType segType); | 47 SkCurveMeasure(const SkPoint* pts, SkSegType segType); |
57 | 48 |
58 SkScalar getTime(SkScalar targetLength); | 49 SkScalar getTime(SkScalar targetLength); |
59 void getPosTanTime(SkScalar distance, SkPoint* pos, SkVector* tan, SkScalar*
time); | 50 void getPosTanTime(SkScalar distance, SkPoint* pos, SkVector* tan, SkScalar*
time); |
60 SkScalar getLength(); | 51 SkScalar getLength(); |
61 | 52 |
62 private: | 53 private: |
| 54 SkPoint evaluateQuad(SkScalar t); |
| 55 SkVector evaluateQuadDerivative(SkScalar t); |
| 56 //SkPoint evaluate_cubic(SkScalar t); |
| 57 //SkVector evaluate_cubic_derivative(SkScalar t); |
| 58 //SkPoint evaluate_conic(SkScalar t); |
| 59 //SkVector evaluate_conic_derivative(SkScalar t); |
| 60 |
63 const SkScalar kTolerance = 0.0001f; | 61 const SkScalar kTolerance = 0.0001f; |
64 const int kNewtonIters = 5; | 62 const int kNewtonIters = 5; |
65 const int kBisectIters = 5; | 63 const int kBisectIters = 5; |
66 | 64 |
67 SkSegType fSegType; | 65 SkSegType fSegType; |
68 SkPoint fPts[4]; | 66 SkPoint fPts[4]; |
69 SkScalar fLength = -1.0f; | 67 SkScalar fLength = -1.0f; |
70 ArcLengthIntegrator fIntegrator; | 68 ArcLengthIntegrator fIntegrator; |
71 | 69 |
72 // for debug purposes | 70 // for debug purposes |
73 int fIters; | 71 int fIters; |
74 }; | 72 }; |
75 | 73 |
76 #endif // SkCurveMeasure_DEFINED | 74 #endif // SkCurveMeasure_DEFINED |
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