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/*
* 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 isNamed() const {
bool result = (SkColorSpace::kNonStandard_GammaNamed != fNamed);
SkASSERT(!result || (0.0f == fValue));
SkASSERT(!result || (0 == fTableSize));
SkASSERT(!result || (0.0f == fG && 0.0f == fE));
return result;
}
bool isValue() const {
bool result = (0.0f != fValue);
SkASSERT(!result || SkColorSpace::kNonStandard_GammaNamed == fNamed);
SkASSERT(!result || (0 == fTableSize));
SkASSERT(!result || (0.0f == fG && 0.0f == fE));
return result;
}
bool isTable() const {
bool result = (0 != fTableSize);
SkASSERT(!result || SkColorSpace::kNonStandard_GammaNamed == fNamed);
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 || SkColorSpace::kNonStandard_GammaNamed == fNamed);
SkASSERT(!result || (0.0f == fValue));
SkASSERT(!result || (0 == fTableSize));
return result;
}
// We have four different ways to represent gamma.
// (1) A known, named type:
SkColorSpace::GammaNamed fNamed;
// (2) A single value:
float fValue;
// (3) A lookup table:
uint32_t fTableSize;
std::unique_ptr<float[]> fTable;
// (4) 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()
: fNamed(SkColorSpace::kNonStandard_GammaNamed)
, fValue(0.0f)
, 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:
static SkColorSpace::GammaNamed Named(SkGammaCurve curves[3]) {
if (SkColorSpace::kLinear_GammaNamed == curves[0].fNamed &&
SkColorSpace::kLinear_GammaNamed == curves[1].fNamed &&
SkColorSpace::kLinear_GammaNamed == curves[2].fNamed)
{
return SkColorSpace::kLinear_GammaNamed;
}
if (SkColorSpace::kSRGB_GammaNamed == curves[0].fNamed &&
SkColorSpace::kSRGB_GammaNamed == curves[1].fNamed &&
SkColorSpace::kSRGB_GammaNamed == curves[2].fNamed)
{
return SkColorSpace::kSRGB_GammaNamed;
}
if (SkColorSpace::k2Dot2Curve_GammaNamed == curves[0].fNamed &&
SkColorSpace::k2Dot2Curve_GammaNamed == curves[1].fNamed &&
SkColorSpace::k2Dot2Curve_GammaNamed == curves[2].fNamed)
{
return SkColorSpace::k2Dot2Curve_GammaNamed;
}
return SkColorSpace::kNonStandard_GammaNamed;
}
const SkGammaCurve& operator[](int i) {
SkASSERT(0 <= i && i < 3);
return (&fRed)[i];
}
const SkGammaCurve fRed;
const SkGammaCurve fGreen;
const SkGammaCurve fBlue;
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:
static sk_sp<SkColorSpace> NewRGB(float gammas[3], const SkMatrix44& toXYZD50);
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(GammaNamed gammaNamed, const SkMatrix44& toXYZD50,
sk_sp<SkData> profileData);
SkColorSpace_Base(GammaNamed gammaNamed, const SkMatrix44& toXYZ, Named 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
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