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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 |
| 11 #include "SkPathMeasurePriv.h" |
11 #include "SkPoint.h" | 12 #include "SkPoint.h" |
12 #include "SkNx.h" | 13 #include "SkNx.h" |
13 | 14 |
14 // These are weights and abscissae for gaussian quadrature with weight function | 15 // These are weights and abscissae for gaussian quadrature with weight function |
15 // w(x) = 1 | 16 // w(x) = 1 |
16 static SkScalar weights8[8] = {0.3626837833783620f, 0.3626837833783620f, | 17 static SkScalar weights8[8] = {0.3626837833783620f, 0.3626837833783620f, |
17 0.3137066458778873f, 0.3137066458778873f, | 18 0.3137066458778873f, 0.3137066458778873f, |
18 0.2223810344533745f, 0.2223810344533745f, | 19 0.2223810344533745f, 0.2223810344533745f, |
19 0.1012285362903763f, 0.1012285362903763f}; | 20 0.1012285362903763f, 0.1012285362903763f}; |
20 static SkScalar absc8[8] = {-0.1834346424956498f, 0.1834346424956498f, | 21 static SkScalar absc8[8] = {-0.1834346424956498f, 0.1834346424956498f, |
21 -0.5255324099163290f, 0.5255324099163290f, | 22 -0.5255324099163290f, 0.5255324099163290f, |
22 -0.7966664774136267f, 0.7966664774136267f, | 23 -0.7966664774136267f, 0.7966664774136267f, |
23 -0.9602898564975363f, 0.9602898564975363f}; | 24 -0.9602898564975363f, 0.9602898564975363f}; |
24 | 25 |
25 static Sk8f weights = Sk8f::Load(weights8); | 26 static Sk8f weights = Sk8f::Load(weights8); |
26 static Sk8f absc = 0.5f*(Sk8f::Load(absc8) + 1.0f); | 27 static Sk8f absc = 0.5f*(Sk8f::Load(absc8) + 1.0f); |
27 | 28 |
28 | 29 |
29 // this is the same enum as in SkPathMeasure but it doesn't have a name there | |
30 enum SkSegType { | |
31 kLine_SegType, | |
32 kQuad_SegType, | |
33 kCubic_SegType, | |
34 kConic_SegType, | |
35 }; | |
36 | |
37 class ArcLengthIntegrator { | 30 class ArcLengthIntegrator { |
38 public: | 31 public: |
39 ArcLengthIntegrator() {} | 32 ArcLengthIntegrator() {} |
40 ArcLengthIntegrator(const SkPoint* pts, SkSegType segType); | 33 ArcLengthIntegrator(const SkPoint* pts, SkSegType segType); |
41 SkScalar computeLength(SkScalar t); | 34 SkScalar computeLength(SkScalar t); |
42 | 35 |
43 private: | 36 private: |
44 SkSegType fSegType; | 37 SkSegType fSegType; |
45 | 38 |
46 // precomputed coefficients for derivatives in Horner form | 39 // precomputed coefficients for derivatives in Horner form |
(...skipping 25 matching lines...) Expand all Loading... |
72 SkSegType fSegType; | 65 SkSegType fSegType; |
73 SkPoint fPts[4]; | 66 SkPoint fPts[4]; |
74 SkScalar fLength = -1.0f; | 67 SkScalar fLength = -1.0f; |
75 ArcLengthIntegrator fIntegrator; | 68 ArcLengthIntegrator fIntegrator; |
76 | 69 |
77 // for debug purposes | 70 // for debug purposes |
78 int fIters; | 71 int fIters; |
79 }; | 72 }; |
80 | 73 |
81 #endif // SkCurveMeasure_DEFINED | 74 #endif // SkCurveMeasure_DEFINED |
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