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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 SkColorSpace_DEFINED | 8 #ifndef SkColorSpace_DEFINED |
9 #define SkColorSpace_DEFINED | 9 #define SkColorSpace_DEFINED |
10 | 10 |
11 // Some terms | 11 // Some terms |
12 // | 12 // |
13 // PCS : Profile Connection Space : where color number values have an absolute
meaning. | 13 // PCS : Profile Connection Space : where color number values have an absolute
meaning. |
14 // Part of the work float is to convert colors to and from this space... | 14 // Part of the work float is to convert colors to and from this space... |
15 // src_linear_unit_floats --> PCS --> PCS' --> dst_linear_unit_floats | 15 // src_linear_unit_floats --> PCS --> PCS' --> dst_linear_unit_floats |
16 // | 16 // |
17 // Some nice documents | 17 // Some nice documents |
18 // | 18 // |
19 // http://www.cambridgeincolour.com/tutorials/color-space-conversion.htm | 19 // http://www.cambridgeincolour.com/tutorials/color-space-conversion.htm |
20 // https://www.w3.org/Graphics/Color/srgb | 20 // https://www.w3.org/Graphics/Color/srgb |
21 // http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html | 21 // http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html |
22 // | 22 // |
23 | 23 |
24 #include "SkRefCnt.h" | 24 #include "SkRefCnt.h" |
| 25 #include "SkMatrix44.h" |
25 | 26 |
26 struct SkFloat3 { | 27 struct SkFloat3 { |
27 float fVec[3]; | 28 float fVec[3]; |
28 | 29 |
29 void dump() const; | 30 void dump() const; |
30 }; | 31 }; |
31 | 32 |
32 struct SkFloat3x3 { | |
33 float fMat[9]; | |
34 | |
35 void dump() const; | |
36 }; | |
37 | |
38 class SkColorSpace : public SkRefCnt { | 33 class SkColorSpace : public SkRefCnt { |
39 private: | 34 private: |
40 struct SkGammaCurve { | 35 struct SkGammaCurve { |
41 bool isValue() const { | 36 bool isValue() const { |
42 bool result = (0.0f != fValue); | 37 bool result = (0.0f != fValue); |
43 SkASSERT(!result || (0 == fTableSize)); | 38 SkASSERT(!result || (0 == fTableSize)); |
44 return result; | 39 return result; |
45 } | 40 } |
46 | 41 |
47 bool isTable() const { | 42 bool isTable() const { |
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110 | 105 |
111 private: | 106 private: |
112 SkGammaCurve fRed; | 107 SkGammaCurve fRed; |
113 SkGammaCurve fGreen; | 108 SkGammaCurve fGreen; |
114 SkGammaCurve fBlue; | 109 SkGammaCurve fBlue; |
115 | 110 |
116 friend class SkColorSpace; | 111 friend class SkColorSpace; |
117 }; | 112 }; |
118 | 113 |
119 /** | 114 /** |
120 * Return a colorspace instance, given a 3x3 transform from linear_RGB to D
50_XYZ | 115 * Return a colorspace instance, given a transform from linear_RGB to D50_X
YZ |
121 * and the src-gamma, return a ColorSpace | 116 * and the src-gamma, return a ColorSpace |
122 */ | 117 */ |
123 static sk_sp<SkColorSpace> NewRGB(const SkFloat3x3& toXYZD50, SkGammas gamma
s); | 118 static sk_sp<SkColorSpace> NewRGB(const SkMatrix44& toXYZD50, SkGammas gamma
s); |
124 | 119 |
125 static sk_sp<SkColorSpace> NewNamed(Named); | 120 static sk_sp<SkColorSpace> NewNamed(Named); |
126 static sk_sp<SkColorSpace> NewICC(const void*, size_t); | 121 static sk_sp<SkColorSpace> NewICC(const void*, size_t); |
127 | 122 |
128 const SkGammas& gammas() const { return fGammas; } | 123 const SkGammas& gammas() const { return fGammas; } |
129 SkFloat3x3 xyz() const { return fToXYZD50; } | 124 SkMatrix44 xyz() const { return fToXYZD50; } |
130 SkFloat3 xyzOffset() const { return fToXYZOffset; } | |
131 Named named() const { return fNamed; } | 125 Named named() const { return fNamed; } |
132 uint32_t uniqueID() const { return fUniqueID; } | 126 uint32_t uniqueID() const { return fUniqueID; } |
133 | 127 |
134 private: | 128 private: |
135 | 129 |
136 static bool LoadGammas(SkGammaCurve* gammas, uint32_t num, const uint8_t* sr
c, size_t len); | 130 static bool LoadGammas(SkGammaCurve* gammas, uint32_t num, const uint8_t* sr
c, size_t len); |
137 | 131 |
138 | 132 |
139 static bool LoadColorLUT(SkColorLookUpTable* colorLUT, uint32_t inputChannel
s, | 133 static bool LoadColorLUT(SkColorLookUpTable* colorLUT, uint32_t inputChannel
s, |
140 uint32_t outputChannels, const uint8_t* src, size_t
len); | 134 uint32_t outputChannels, const uint8_t* src, size_t
len); |
141 | 135 |
142 | 136 |
143 static bool LoadA2B0(SkColorLookUpTable* colorLUT, SkGammas* gammas, SkFloat
3x3* toXYZ, | 137 static bool LoadA2B0(SkColorLookUpTable* colorLUT, SkGammas* gammas, SkMatri
x44* toXYZ, |
144 SkFloat3* toXYZOffset, const uint8_t* src, size_t len); | 138 const uint8_t* src, size_t len); |
145 | 139 |
146 SkColorSpace(SkGammas gammas, const SkFloat3x3& toXYZ, Named); | 140 SkColorSpace(SkGammas gammas, const SkMatrix44& toXYZ, Named); |
147 | 141 |
148 SkColorSpace(SkColorLookUpTable colorLUT, SkGammas gammas, | 142 SkColorSpace(SkColorLookUpTable colorLUT, SkGammas gammas, |
149 const SkFloat3x3& toXYZ, const SkFloat3& toXYZOffset); | 143 const SkMatrix44& toXYZ); |
150 | 144 |
151 const SkColorLookUpTable fColorLUT; | 145 const SkColorLookUpTable fColorLUT; |
152 const SkGammas fGammas; | 146 const SkGammas fGammas; |
153 const SkFloat3x3 fToXYZD50; | 147 const SkMatrix44 fToXYZD50; |
154 const SkFloat3 fToXYZOffset; | |
155 | 148 |
156 const uint32_t fUniqueID; | 149 const uint32_t fUniqueID; |
157 const Named fNamed; | 150 const Named fNamed; |
158 }; | 151 }; |
159 | 152 |
160 #endif | 153 #endif |
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