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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 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 SkPerlinNoiseShader_DEFINED | 8 #ifndef SkPerlinNoiseShader_DEFINED |
9 #define SkPerlinNoiseShader_DEFINED | 9 #define SkPerlinNoiseShader_DEFINED |
10 | 10 |
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48 * | 48 * |
49 * The number of octaves provided should be fairly small, although no limit
is enforced. | 49 * The number of octaves provided should be fairly small, although no limit
is enforced. |
50 * Each octave doubles the frequency, so 10 octaves would produce noise fro
m | 50 * Each octave doubles the frequency, so 10 octaves would produce noise fro
m |
51 * baseFrequency * 1, * 2, * 4, ..., * 512, which quickly yields insignific
antly small | 51 * baseFrequency * 1, * 2, * 4, ..., * 512, which quickly yields insignific
antly small |
52 * periods and resembles regular unstructured noise rather than Perlin nois
e. | 52 * periods and resembles regular unstructured noise rather than Perlin nois
e. |
53 * | 53 * |
54 * If tileSize isn't NULL or an empty size, the tileSize parameter will be
used to modify | 54 * If tileSize isn't NULL or an empty size, the tileSize parameter will be
used to modify |
55 * the frequencies so that the noise will be tileable for the given tile si
ze. If tileSize | 55 * the frequencies so that the noise will be tileable for the given tile si
ze. If tileSize |
56 * is NULL or an empty size, the frequencies will be used as is without mod
ification. | 56 * is NULL or an empty size, the frequencies will be used as is without mod
ification. |
57 */ | 57 */ |
| 58 static sk_sp<SkShader> MakeFractalNoise(SkScalar baseFrequencyX, SkScalar ba
seFrequencyY, |
| 59 int numOctaves, SkScalar seed, |
| 60 const SkISize* tileSize = nullptr); |
| 61 static sk_sp<SkShader> MakeTurbulence(SkScalar baseFrequencyX, SkScalar base
FrequencyY, |
| 62 int numOctaves, SkScalar seed, |
| 63 const SkISize* tileSize = nullptr); |
| 64 |
| 65 #ifdef SK_SUPPORT_LEGACY_CREATESHADER_PTR |
58 static SkShader* CreateFractalNoise(SkScalar baseFrequencyX, SkScalar baseFr
equencyY, | 66 static SkShader* CreateFractalNoise(SkScalar baseFrequencyX, SkScalar baseFr
equencyY, |
59 int numOctaves, SkScalar seed, | 67 int numOctaves, SkScalar seed, |
60 const SkISize* tileSize = NULL); | 68 const SkISize* tileSize = NULL) { |
| 69 return MakeFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves, seed
, tileSize).release(); |
| 70 } |
61 static SkShader* CreateTurbulence(SkScalar baseFrequencyX, SkScalar baseFreq
uencyY, | 71 static SkShader* CreateTurbulence(SkScalar baseFrequencyX, SkScalar baseFreq
uencyY, |
62 int numOctaves, SkScalar seed, | 72 int numOctaves, SkScalar seed, |
63 const SkISize* tileSize = NULL); | 73 const SkISize* tileSize = NULL) { |
64 /** | 74 return MakeTurbulence(baseFrequencyX, baseFrequencyY, numOctaves, seed,
tileSize).release(); |
65 * Create alias for CreateTurbulunce until all Skia users changed | 75 } |
66 * its code to use the new naming | |
67 */ | |
68 static SkShader* CreateTubulence(SkScalar baseFrequencyX, SkScalar baseFrequ
encyY, | 76 static SkShader* CreateTubulence(SkScalar baseFrequencyX, SkScalar baseFrequ
encyY, |
69 int numOctaves, SkScalar seed, | 77 int numOctaves, SkScalar seed, |
70 const SkISize* tileSize = NULL) { | 78 const SkISize* tileSize = NULL) { |
71 return CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves, seed
, tileSize); | 79 return CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves, seed
, tileSize); |
72 } | 80 } |
| 81 #endif |
73 | 82 |
74 class PerlinNoiseShaderContext : public SkShader::Context { | 83 class PerlinNoiseShaderContext : public SkShader::Context { |
75 public: | 84 public: |
76 PerlinNoiseShaderContext(const SkPerlinNoiseShader& shader, const Contex
tRec&); | 85 PerlinNoiseShaderContext(const SkPerlinNoiseShader& shader, const Contex
tRec&); |
77 virtual ~PerlinNoiseShaderContext(); | 86 virtual ~PerlinNoiseShaderContext(); |
78 | 87 |
79 void shadeSpan(int x, int y, SkPMColor[], int count) override; | 88 void shadeSpan(int x, int y, SkPMColor[], int count) override; |
80 | 89 |
81 private: | 90 private: |
82 SkPMColor shade(const SkPoint& point, StitchData& stitchData) const; | 91 SkPMColor shade(const SkPoint& point, StitchData& stitchData) const; |
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116 const SkScalar fBaseFrequencyY; | 125 const SkScalar fBaseFrequencyY; |
117 const int fNumOctaves; | 126 const int fNumOctaves; |
118 const SkScalar fSeed; | 127 const SkScalar fSeed; |
119 const SkISize fTileSize; | 128 const SkISize fTileSize; |
120 const bool fStitchTiles; | 129 const bool fStitchTiles; |
121 | 130 |
122 typedef SkShader INHERITED; | 131 typedef SkShader INHERITED; |
123 }; | 132 }; |
124 | 133 |
125 #endif | 134 #endif |
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