| /* |
| * 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 |