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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(SkColorSpace* srcSpace, SkColorSpace* dstSpace);
enum ColorFormat : uint8_t {
kRGBA_8888_ColorFormat,
kBGRA_8888_ColorFormat,
kRGBA_F16_ColorFormat,
kRGBA_F32_ColorFormat,
};
/**
* Apply the color conversion to a |src| buffer, storing the output in the |dst| buffer.
*
* @param dst Stored in the format described by |dstColorFormat|
* @param src Stored in the format described by |srcColorFormat|
* @param len Number of pixels in the buffers
* @param dstColorFormat Describes color format of |dst|
* @param srcColorFormat Describes color format of |src|
* Must be kRGBA_8888 or kBGRA_8888
* @param alphaType Describes alpha properties of the |dst| (and |src|)
* kUnpremul preserves input alpha values
* kPremul performs a premultiplication and also preserves alpha values
* kOpaque optimization hint, |dst| alphas set to 1
*
*/
virtual void apply(void* dst, const uint32_t* src, int len, ColorFormat dstColorFormat,
ColorFormat srcColorFormat, SkAlphaType alphaType) const = 0;
virtual ~SkColorSpaceXform() {}
};
enum SrcGamma {
kLinear_SrcGamma,
kTable_SrcGamma,
};
enum DstGamma {
kLinear_DstGamma,
kSRGB_DstGamma,
k2Dot2_DstGamma,
kTable_DstGamma,
};
enum ColorSpaceMatch {
kNone_ColorSpaceMatch,
kGamut_ColorSpaceMatch,
kFull_ColorSpaceMatch,
};
template <SrcGamma kSrc, DstGamma kDst, ColorSpaceMatch kCSM>
class SkColorSpaceXform_Base : public SkColorSpaceXform {
public:
void apply(void* dst, const uint32_t* src, int len, ColorFormat dstColorFormat,
ColorFormat srcColorFormat, SkAlphaType alphaType) const override;
static constexpr int kDstGammaTableSize = 1024;
private:
SkColorSpaceXform_Base(SkColorSpace* srcSpace, const SkMatrix44& srcToDst,
SkColorSpace* dstSpace);
sk_sp<SkColorLookUpTable> fColorLUT;
// Contain pointers into storage or pointers into precomputed tables.
const float* fSrcGammaTables[3];
const uint8_t* fDstGammaTables[3];
SkAutoMalloc fStorage;
float fSrcToDst[16];
friend class SkColorSpaceXform;
friend std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(SkColorSpace* space);
};
// For testing. Bypasses opts for when src and dst color spaces are equal.
std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(SkColorSpace* space);
#endif
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