| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkColorSpace_Base_DEFINED |
| #define SkColorSpace_Base_DEFINED |
| |
| #include "SkColorSpace.h" |
| #include "SkData.h" |
| #include "SkTemplates.h" |
| |
| struct SkGammaCurve { |
| bool isValue() const { |
| bool result = (0.0f != fValue); |
| SkASSERT(!result || (0 == fTableSize)); |
| SkASSERT(!result || (0.0f == fG && 0.0f == fE)); |
| return result; |
| } |
| |
| bool isTable() const { |
| bool result = (0 != fTableSize); |
| SkASSERT(!result || (0.0f == fValue)); |
| SkASSERT(!result || (0.0f == fG && 0.0f == fE)); |
| SkASSERT(!result || fTable); |
| return result; |
| } |
| |
| bool isParametric() const { |
| bool result = (0.0f != fG || 0.0f != fE); |
| SkASSERT(!result || (0.0f == fValue)); |
| SkASSERT(!result || (0 == fTableSize)); |
| return result; |
| } |
| |
| // We have three different ways to represent gamma. |
| // (1) A single value: |
| float fValue; |
| |
| // (2) A lookup table: |
| uint32_t fTableSize; |
| std::unique_ptr<float[]> fTable; |
| |
| // (3) Parameters for a curve: |
| // Y = (aX + b)^g + c for X >= d |
| // Y = eX + f otherwise |
| float fG; |
| float fA; |
| float fB; |
| float fC; |
| float fD; |
| float fE; |
| float fF; |
| |
| SkGammaCurve() { |
| memset(this, 0, sizeof(struct SkGammaCurve)); |
| } |
| |
| SkGammaCurve(float value) |
| : fValue(value) |
| , fTableSize(0) |
| , fTable(nullptr) |
| , fG(0.0f) |
| , fA(0.0f) |
| , fB(0.0f) |
| , fC(0.0f) |
| , fD(0.0f) |
| , fE(0.0f) |
| , fF(0.0f) |
| {} |
| }; |
| |
| struct SkGammas : public SkRefCnt { |
| public: |
| bool isValues() const { |
| return fRed.isValue() && fGreen.isValue() && fBlue.isValue(); |
| } |
| |
| const SkGammaCurve& operator[](int i) { |
| SkASSERT(0 <= i && i < 3); |
| return (&fRed)[i]; |
| } |
| |
| const SkGammaCurve fRed; |
| const SkGammaCurve fGreen; |
| const SkGammaCurve fBlue; |
| |
| SkGammas(float red, float green, float blue) |
| : fRed(red) |
| , fGreen(green) |
| , fBlue(blue) |
| {} |
| |
| SkGammas(SkGammaCurve red, SkGammaCurve green, SkGammaCurve blue) |
| : fRed(std::move(red)) |
| , fGreen(std::move(green)) |
| , fBlue(std::move(blue)) |
| {} |
| |
| SkGammas() {} |
| |
| friend class SkColorSpace; |
| }; |
| |
| struct SkColorLookUpTable { |
| static const uint8_t kMaxChannels = 16; |
| |
| uint8_t fInputChannels; |
| uint8_t fOutputChannels; |
| uint8_t fGridPoints[kMaxChannels]; |
| std::unique_ptr<float[]> fTable; |
| |
| SkColorLookUpTable() { |
| memset(this, 0, sizeof(struct SkColorLookUpTable)); |
| } |
| }; |
| |
| class SkColorSpace_Base : public SkColorSpace { |
| public: |
| |
| const sk_sp<SkGammas>& gammas() const { return fGammas; } |
| |
| SkColorLookUpTable* colorLUT() const { return fColorLUT.get(); } |
| |
| /** |
| * Writes this object as an ICC profile. |
| */ |
| sk_sp<SkData> writeToICC() const; |
| |
| private: |
| |
| static sk_sp<SkColorSpace> NewRGB(const float gammas[3], const SkMatrix44& toXYZD50, |
| sk_sp<SkData> profileData); |
| |
| SkColorSpace_Base(sk_sp<SkGammas> gammas, const SkMatrix44& toXYZ, Named, |
| sk_sp<SkData> profileData); |
| |
| SkColorSpace_Base(sk_sp<SkGammas> gammas, GammaNamed gammaNamed, const SkMatrix44& toXYZ, |
| Named, sk_sp<SkData> profileData); |
| |
| SkColorSpace_Base(SkColorLookUpTable* colorLUT, sk_sp<SkGammas> gammas, |
| const SkMatrix44& toXYZ, sk_sp<SkData> profileData); |
| |
| SkAutoTDelete<SkColorLookUpTable> fColorLUT; |
| sk_sp<SkGammas> fGammas; |
| sk_sp<SkData> fProfileData; |
| |
| friend class SkColorSpace; |
| typedef SkColorSpace INHERITED; |
| }; |
| |
| static inline SkColorSpace_Base* as_CSB(SkColorSpace* colorSpace) { |
| return static_cast<SkColorSpace_Base*>(colorSpace); |
| } |
| |
| static inline const SkColorSpace_Base* as_CSB(const SkColorSpace* colorSpace) { |
| return static_cast<const SkColorSpace_Base*>(colorSpace); |
| } |
| |
| static inline SkColorSpace_Base* as_CSB(const sk_sp<SkColorSpace>& colorSpace) { |
| return static_cast<SkColorSpace_Base*>(colorSpace.get()); |
| } |
| |
| #endif |