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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 SkColorSpaceXform_DEFINED
#define SkColorSpaceXform_DEFINED
#include "SkColorSpace.h"
#include "SkColorSpace_Base.h"
#include "SkImageInfo.h"
class SkColorSpaceXform : SkNoncopyable {
public:
/**
* Create an object to handle color space conversions.
*
* @param srcSpace The encoded color space.
* @param dstSpace The destination color space.
*
*/
static std::unique_ptr<SkColorSpaceXform> New(const sk_sp<SkColorSpace>& srcSpace,
const sk_sp<SkColorSpace>& dstSpace);
/**
* Apply the color conversion to a src buffer, storing the output in the dst buffer.
* The src is stored as RGBA (8888). The dst is stored in the format indicated by
* |dstColorType| and is premultiplied by alpha if |premul| is set.
*/
virtual void apply(void* dst, const uint32_t* src, int len, SkColorType dstColorType,
SkAlphaType dstAlphaType) const = 0;
virtual ~SkColorSpaceXform() {}
};
enum ColorSpaceMatch {
kNone_ColorSpaceMatch,
kGamut_ColorSpaceMatch,
kFull_ColorSpaceMatch,
};
template <SkGammaNamed kDst, ColorSpaceMatch kCSM>
class SkColorSpaceXform_Base : public SkColorSpaceXform {
public:
void apply(void* dst, const uint32_t* src, int len, SkColorType dstColorType,
SkAlphaType dstAlphaType) const override;
static constexpr int kDstGammaTableSize = 1024;
private:
SkColorSpaceXform_Base(const sk_sp<SkColorSpace>& srcSpace, const SkMatrix44& srcToDst,
const sk_sp<SkColorSpace>& dstSpace);
sk_sp<SkColorLookUpTable> fColorLUT;
// May contain pointers into storage or pointers into precomputed tables.
const float* fSrcGammaTables[3];
float fSrcGammaTableStorage[3 * 256];
float fSrcToDst[16];
// May contain pointers into storage or pointers into precomputed tables.
const uint8_t* fDstGammaTables[3];
uint8_t fDstGammaTableStorage[3 * kDstGammaTableSize];
friend class SkColorSpaceXform;
friend std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(const sk_sp<SkColorSpace>& space);
};
// For testing. Bypasses opts for when src and dst color spaces are equal.
std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(const sk_sp<SkColorSpace>& space);
#endif
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