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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"
class SkColorSpaceXform : SkNoncopyable {
public:
typedef uint32_t RGBA32;
typedef uint64_t RGBAF16;
/**
* 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) and is treated as opaque.
* TODO (msarett): Support non-opaque srcs.
*/
virtual void applyTo8888(SkPMColor* dst, const RGBA32* src, int len) const = 0;
virtual void applyToF16(RGBAF16* dst, const RGBA32* src, int len) const = 0;
virtual ~SkColorSpaceXform() {}
};
template <SkColorSpace::GammaNamed Dst>
class SkFastXform : public SkColorSpaceXform {
public:
void applyTo8888(SkPMColor* dst, const RGBA32* src, int len) const override;
void applyToF16(RGBAF16* dst, const RGBA32* src, int len) const override;
private:
SkFastXform(const sk_sp<SkColorSpace>& srcSpace, const SkMatrix44& srcToDst,
const sk_sp<SkColorSpace>& dstSpace);
static constexpr int kDstGammaTableSize = 1024;
// May contain pointers into storage or pointers into precomputed tables.
const float* fSrcGammaTables[3];
float fSrcGammaTableStorage[3 * 256];
float fSrcToDst[12];
// May contain pointers into storage or pointers into precomputed tables.
const uint8_t* fDstGammaTables[3];
uint8_t fDstGammaTableStorage[3 * kDstGammaTableSize];
friend class SkColorSpaceXform;
};
/**
* Works for any valid src and dst profiles.
*/
// TODO (msarett):
// Merge with SkFastXform and delete this. SkFastXform can almost do everything that
// this does.
class SkDefaultXform : public SkColorSpaceXform {
public:
void applyTo8888(SkPMColor* dst, const RGBA32* src, int len) const override;
void applyToF16(RGBAF16* dst, const RGBA32* src, int len) const override;
private:
SkDefaultXform(const sk_sp<SkColorSpace>& srcSpace, const SkMatrix44& srcToDst,
const sk_sp<SkColorSpace>& dstSpace);
static constexpr int kDstGammaTableSize = 1024;
sk_sp<SkColorLookUpTable> fColorLUT;
// May contain pointers into storage or pointers into precomputed tables.
const float* fSrcGammaTables[3];
float fSrcGammaTableStorage[3 * 256];
const SkMatrix44 fSrcToDst;
// May contain pointers into storage or pointers into precomputed tables.
const uint8_t* fDstGammaTables[3];
uint8_t fDstGammaTableStorage[3 * kDstGammaTableSize];
friend class SkColorSpaceXform;
};
#endif
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