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1 /* | 1 /* |
2 * Copyright 2006 The Android Open Source Project | 2 * Copyright 2006 The Android Open Source Project |
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 SkGeometry_DEFINED | 8 #ifndef SkGeometry_DEFINED |
9 #define SkGeometry_DEFINED | 9 #define SkGeometry_DEFINED |
10 | 10 |
11 #include "SkMatrix.h" | 11 #include "SkMatrix.h" |
12 #include "SkNx.h" | |
13 | |
14 static inline Sk2s from_point(const SkPoint& point) { | |
15 return Sk2s::Load(&point.fX); | |
16 } | |
17 | |
18 static inline SkPoint to_point(const Sk2s& x) { | |
19 SkPoint point; | |
20 x.store(&point.fX); | |
21 return point; | |
22 } | |
23 | |
24 static inline Sk2s sk2s_cubic_eval(const Sk2s& A, const Sk2s& B, const Sk2s& C,
const Sk2s& D, | |
25 const Sk2s& t) { | |
26 return ((A * t + B) * t + C) * t + D; | |
27 } | |
28 | 12 |
29 /** Given a quadratic equation Ax^2 + Bx + C = 0, return 0, 1, 2 roots for the | 13 /** Given a quadratic equation Ax^2 + Bx + C = 0, return 0, 1, 2 roots for the |
30 equation. | 14 equation. |
31 */ | 15 */ |
32 int SkFindUnitQuadRoots(SkScalar A, SkScalar B, SkScalar C, SkScalar roots[2]); | 16 int SkFindUnitQuadRoots(SkScalar A, SkScalar B, SkScalar C, SkScalar roots[2]); |
33 | 17 |
34 /////////////////////////////////////////////////////////////////////////////// | 18 /////////////////////////////////////////////////////////////////////////////// |
35 | 19 |
36 SkPoint SkEvalQuadAt(const SkPoint src[3], SkScalar t); | 20 SkPoint SkEvalQuadAt(const SkPoint src[3], SkScalar t); |
37 SkPoint SkEvalQuadTangentAt(const SkPoint src[3], SkScalar t); | 21 SkPoint SkEvalQuadTangentAt(const SkPoint src[3], SkScalar t); |
38 | 22 |
39 /** Set pt to the point on the src quadratic specified by t. t must be | 23 /** Set pt to the point on the src quadratic specified by t. t must be |
40 0 <= t <= 1.0 | 24 0 <= t <= 1.0 |
41 */ | 25 */ |
42 void SkEvalQuadAt(const SkPoint src[3], SkScalar t, SkPoint* pt, SkVector* tange
nt = NULL); | 26 void SkEvalQuadAt(const SkPoint src[3], SkScalar t, SkPoint* pt, SkVector* tange
nt = NULL); |
43 | 27 |
44 /** | |
45 * output is : eval(t) == coeff[0] * t^2 + coeff[1] * t + coeff[2] | |
46 */ | |
47 void SkQuadToCoeff(const SkPoint pts[3], SkPoint coeff[3]); | |
48 | |
49 /** | |
50 * output is : eval(t) == coeff[0] * t^3 + coeff[1] * t^2 + coeff[2] * t + coef
f[3] | |
51 */ | |
52 void SkCubicToCoeff(const SkPoint pts[4], SkPoint coeff[4]); | |
53 | |
54 /** Given a src quadratic bezier, chop it at the specified t value, | 28 /** Given a src quadratic bezier, chop it at the specified t value, |
55 where 0 < t < 1, and return the two new quadratics in dst: | 29 where 0 < t < 1, and return the two new quadratics in dst: |
56 dst[0..2] and dst[2..4] | 30 dst[0..2] and dst[2..4] |
57 */ | 31 */ |
58 void SkChopQuadAt(const SkPoint src[3], SkPoint dst[5], SkScalar t); | 32 void SkChopQuadAt(const SkPoint src[3], SkPoint dst[5], SkScalar t); |
59 | 33 |
60 /** Given a src quadratic bezier, chop it at the specified t == 1/2, | 34 /** Given a src quadratic bezier, chop it at the specified t == 1/2, |
61 The new quads are returned in dst[0..2] and dst[2..4] | 35 The new quads are returned in dst[0..2] and dst[2..4] |
62 */ | 36 */ |
63 void SkChopQuadAtHalf(const SkPoint src[3], SkPoint dst[5]); | 37 void SkChopQuadAtHalf(const SkPoint src[3], SkPoint dst[5]); |
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330 private: | 304 private: |
331 enum { | 305 enum { |
332 kQuadCount = 8, // should handle most conics | 306 kQuadCount = 8, // should handle most conics |
333 kPointCount = 1 + 2 * kQuadCount, | 307 kPointCount = 1 + 2 * kQuadCount, |
334 }; | 308 }; |
335 SkAutoSTMalloc<kPointCount, SkPoint> fStorage; | 309 SkAutoSTMalloc<kPointCount, SkPoint> fStorage; |
336 int fQuadCount; // #quads for current usage | 310 int fQuadCount; // #quads for current usage |
337 }; | 311 }; |
338 | 312 |
339 #endif | 313 #endif |
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