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| 1 /* | |
| 2 * Copyright 2016 Google Inc. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #ifndef SkColorSpace_DEFINED | |
| 9 #define SkColorSpace_DEFINED | |
| 10 | |
| 11 // Some terms | |
| 12 // | |
| 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... | |
| 15 // src_linear_unit_floats --> PCS --> PCS' --> dst_linear_unit_floats | |
| 16 // | |
| 17 // Some nice documents | |
| 18 // | |
| 19 // http://www.cambridgeincolour.com/tutorials/color-space-conversion.htm | |
| 20 // https://www.w3.org/Graphics/Color/srgb | |
| 21 // http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html | |
| 22 // | |
| 23 | |
| 24 #include "SkRefCnt.h" | |
| 25 | |
| 26 struct SkFloat3 { | |
| 27 float fVec[3]; | |
| 28 | |
| 29 void dump() const; | |
| 30 }; | |
| 31 | |
| 32 struct SkFloat3x3 { | |
| 33 float fMat[9]; | |
| 34 | |
| 35 void dump() const; | |
| 36 }; | |
| 37 | |
| 38 struct SkPM4f; | |
| 39 void SkApply3x3ToPM4f(const SkFloat3x3&, const SkPM4f src[], SkPM4f dst[], int c
ount); | |
| 40 | |
| 41 class SkColorSpace : public SkRefCnt { | |
| 42 public: | |
| 43 enum Named { | |
| 44 kUnknown_Named, | |
| 45 kDevice_Named, | |
| 46 kSRGB_Named, | |
| 47 }; | |
| 48 | |
| 49 /** | |
| 50 * Return a colorspace instance, given a 3x3 transform from linear_RGB to D
50_XYZ | |
| 51 * and the src-gamma, return a ColorSpace | |
| 52 */ | |
| 53 static SkColorSpace* NewRGB(const SkFloat3x3& toXYZD50, const SkFloat3& gamm
a); | |
| 54 | |
| 55 static SkColorSpace* NewNamed(Named); | |
| 56 static SkColorSpace* NewICC(const void*, size_t); | |
| 57 | |
| 58 SkFloat3 gamma() const { return fGamma; } | |
| 59 Named named() const { return fNamed; } | |
| 60 uint32_t uniqueID() const { return fUniqueID; } | |
| 61 | |
| 62 enum Result { | |
| 63 kFailure_Result, | |
| 64 kIdentity_Result, | |
| 65 kNormal_Result, | |
| 66 }; | |
| 67 | |
| 68 /** | |
| 69 * Given a src and dst colorspace, return the 3x3 matrix that will convert
src_linear_RGB | |
| 70 * values into dst_linear_RGB values. | |
| 71 */ | |
| 72 static Result Concat(const SkColorSpace* src, const SkColorSpace* dst, SkFlo
at3x3* result); | |
| 73 | |
| 74 static void Test(); | |
| 75 void dump() const; | |
| 76 | |
| 77 protected: | |
| 78 SkColorSpace(const SkFloat3x3& toXYZ, const SkFloat3& gamma, Named); | |
| 79 | |
| 80 private: | |
| 81 const SkFloat3x3 fToXYZD50; | |
| 82 const SkFloat3 fGamma; | |
| 83 const uint32_t fUniqueID; | |
| 84 const Named fNamed; | |
| 85 }; | |
| 86 | |
| 87 #endif | |
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Chromium Code Reviews
Issue 1726823002:
Set SkColorSpace object for PNGs and parse ICC profiles (Closed)
Base URL: https://skia.googlesource.com/skia.git@master