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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 "SkRefCnt.h"
struct SkFloat3 {
float fVec[3];
void dump() const;
};
struct SkFloat3x3 {
float fMat[9];
void dump() const;
};
struct SkPM4f;
void SkApply3x3ToPM4f(const SkFloat3x3&, const SkPM4f src[], SkPM4f dst[], int count);
class SkColorSpace : public SkRefCnt {
public:
enum Named {
kUnknown_Named,
kDevice_Named,
kSRGB_Named,
};
/**
* Return a colorspace instance, given a 3x3 transform from linear_RGB to D50_XYZ
* and the src-gamma, return a ColorSpace
*/
static SkColorSpace* NewRGB(const SkFloat3x3& toXYZD50, const SkFloat3& gamma);
static SkColorSpace* NewNamed(Named);
static SkColorSpace* NewICC(const void*, size_t);
SkFloat3 gamma() const { return fGamma; }
Named named() const { return fNamed; }
uint32_t uniqueID() const { return fUniqueID; }
enum Result {
kFailure_Result,
kIdentity_Result,
kNormal_Result,
};
/**
* Given a src and dst colorspace, return the 3x3 matrix that will convert src_linear_RGB
* values into dst_linear_RGB values.
*/
static Result Concat(const SkColorSpace* src, const SkColorSpace* dst, SkFloat3x3* result);
static void Test();
void dump() const;
protected:
SkColorSpace(const SkFloat3x3& toXYZ, const SkFloat3& gamma, Named);
private:
const SkFloat3x3 fToXYZD50;
const SkFloat3 fGamma;
const uint32_t fUniqueID;
const Named fNamed;
};
#endif
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