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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_DEFINED
#define SkColorSpace_DEFINED
// Some terms
//
// PCS : Profile Connection Space : where color number values have an absolute meaning.
// Part of the work float is to convert colors to and from this space...
// src_linear_unit_floats --> PCS --> PCS' --> dst_linear_unit_floats
//
// Some nice documents
//
// http://www.cambridgeincolour.com/tutorials/color-space-conversion.htm
// https://www.w3.org/Graphics/Color/srgb
// http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html
//
#include "SkMatrix44.h"
#include "SkRefCnt.h"
#include "../private/SkTemplates.h"
struct SkColorLookUpTable;
struct SkGammaCurve;
struct SkGammas;
class SkColorSpace : public SkRefCnt {
public:
enum Named {
kUnknown_Named,
kSRGB_Named,
kAdobeRGB_Named,
};
/**
* Given the src gamma and a transform from src gamut to D50_XYZ, return a SkColorSpace.
*/
static sk_sp<SkColorSpace> NewRGB(float gammas[3], const SkMatrix44& toXYZD50);
static sk_sp<SkColorSpace> NewNamed(Named);
static sk_sp<SkColorSpace> NewICC(const void*, size_t);
/**
* Used only by test code.
*/
SkGammas* gammas() const { return fGammas.get(); }
SkMatrix44 xyz() const { return fToXYZD50; }
Named named() const { return fNamed; }
uint32_t uniqueID() const { return fUniqueID; }
private:
static bool LoadGammas(SkGammaCurve* gammas, uint32_t num, const uint8_t* src, size_t len);
static bool LoadColorLUT(SkColorLookUpTable* colorLUT, uint32_t inputChannels,
uint32_t outputChannels, const uint8_t* src, size_t len);
static bool LoadA2B0(SkColorLookUpTable* colorLUT, SkGammaCurve*, SkMatrix44* toXYZ,
const uint8_t* src, size_t len);
SkColorSpace(sk_sp<SkGammas> gammas, const SkMatrix44& toXYZ, Named);
SkColorSpace(SkColorLookUpTable* colorLUT, sk_sp<SkGammas> gammas, const SkMatrix44& toXYZ);
SkAutoTDelete<SkColorLookUpTable> fColorLUT;
sk_sp<SkGammas> fGammas;
const SkMatrix44 fToXYZD50;
const uint32_t fUniqueID;
const Named fNamed;
};
#endif
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