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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_Base_DEFINED
#define SkColorSpaceXform_Base_DEFINED
#include "SkColorSpace.h"
#include "SkColorSpaceXform.h"
#include "SkTemplates.h"
class SkColorSpace_XYZ;
class SkColorSpaceXform_Base {
public:
// A somewhat more powerful SkColorSpaceXform::New() that allows tweaking premulBehavior.
static std::unique_ptr<SkColorSpaceXform> New(SkColorSpace* srcSpace,
SkColorSpace* dstSpace,
SkTransferFunctionBehavior premulBehavior);
static constexpr int kDstGammaTableSize = 1024;
static void BuildDstGammaTables(const uint8_t* outGammaTables[3],
uint8_t* gammaTableStorage,
const SkColorSpace_XYZ* space,
bool gammasAreMatching);
};
class SkColorSpaceXform_XYZ : public SkColorSpaceXform {
public:
SkColorSpaceXform_XYZ(SkColorSpace_XYZ* src, SkColorSpace_XYZ* dst, SkTransferFunctionBehavior);
bool apply(ColorFormat dstFormat, void* dst,
ColorFormat srcFormat, const void* src,
int count, SkAlphaType alphaType) const override;
void pretendNotToBeIdentityForTesting() {
fSrcToDstIsIdentity = false;
}
private:
enum SrcGamma {
kLinear_SrcGamma,
kTable_SrcGamma,
kSRGB_SrcGamma,
};
enum DstGamma {
kLinear_DstGamma,
kSRGB_DstGamma,
k2Dot2_DstGamma,
kTable_DstGamma,
};
// These tables pointers may point into fSrcStorage/fDstStorage or into pre-baked tables.
const float* fSrcGammaTables[3];
const uint8_t* fDstGammaTables[3];
SkAutoTMalloc<float> fSrcStorage;
sk_sp<SkData> fDstStorage;
float fSrcToDst[12];
bool fSrcToDstIsIdentity;
bool fColorSpacesAreIdentical;
SrcGamma fSrcGamma;
DstGamma fDstGamma;
SkTransferFunctionBehavior fPremulBehavior;
};
// For testing. Bypasses opts for when src and dst color spaces are equal.
std::unique_ptr<SkColorSpaceXform> SlowIdentityXform(SkColorSpace_XYZ* space);
#if defined(SK_USE_SKCMS)
std::unique_ptr<SkColorSpaceXform> MakeSkcmsXform(SkColorSpace* src, SkColorSpace* dst,
SkTransferFunctionBehavior premulBehavior);
#endif
#endif
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