| /* |
| * 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 SkColorSpace_DEFINED |
| #define SkColorSpace_DEFINED |
| |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkTypes.h" |
| #include "include/private/SkFixed.h" |
| #include "include/private/base/SkOnce.h" |
| #include "modules/skcms/skcms.h" |
| |
| #include <cstddef> |
| #include <cstdint> |
| |
| class SkData; |
| |
| /** |
| * Describes a color gamut with primaries and a white point. |
| */ |
| struct SK_API SkColorSpacePrimaries { |
| float fRX; |
| float fRY; |
| float fGX; |
| float fGY; |
| float fBX; |
| float fBY; |
| float fWX; |
| float fWY; |
| |
| /** |
| * Convert primaries and a white point to a toXYZD50 matrix, the preferred color gamut |
| * representation of SkColorSpace. |
| */ |
| bool toXYZD50(skcms_Matrix3x3* toXYZD50) const; |
| }; |
| |
| namespace SkNamedTransferFn { |
| |
| // Like SkNamedGamut::kSRGB, keeping this bitwise exactly the same as skcms makes things fastest. |
| static constexpr skcms_TransferFunction kSRGB = |
| { 2.4f, (float)(1/1.055), (float)(0.055/1.055), (float)(1/12.92), 0.04045f, 0.0f, 0.0f }; |
| |
| static constexpr skcms_TransferFunction k2Dot2 = |
| { 2.2f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }; |
| |
| static constexpr skcms_TransferFunction kLinear = |
| { 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }; |
| |
| static constexpr skcms_TransferFunction kRec2020 = |
| {2.22222f, 0.909672f, 0.0903276f, 0.222222f, 0.0812429f, 0, 0}; |
| |
| static constexpr skcms_TransferFunction kPQ = |
| {-2.0f, -107/128.0f, 1.0f, 32/2523.0f, 2413/128.0f, -2392/128.0f, 8192/1305.0f }; |
| |
| static constexpr skcms_TransferFunction kHLG = |
| {-3.0f, 2.0f, 2.0f, 1/0.17883277f, 0.28466892f, 0.55991073f, 0.0f }; |
| |
| } // namespace SkNamedTransferFn |
| |
| namespace SkNamedGamut { |
| |
| static constexpr skcms_Matrix3x3 kSRGB = {{ |
| // ICC fixed-point (16.16) representation, taken from skcms. Please keep them exactly in sync. |
| // 0.436065674f, 0.385147095f, 0.143066406f, |
| // 0.222488403f, 0.716873169f, 0.060607910f, |
| // 0.013916016f, 0.097076416f, 0.714096069f, |
| { SkFixedToFloat(0x6FA2), SkFixedToFloat(0x6299), SkFixedToFloat(0x24A0) }, |
| { SkFixedToFloat(0x38F5), SkFixedToFloat(0xB785), SkFixedToFloat(0x0F84) }, |
| { SkFixedToFloat(0x0390), SkFixedToFloat(0x18DA), SkFixedToFloat(0xB6CF) }, |
| }}; |
| |
| static constexpr skcms_Matrix3x3 kAdobeRGB = {{ |
| // ICC fixed-point (16.16) repesentation of: |
| // 0.60974, 0.20528, 0.14919, |
| // 0.31111, 0.62567, 0.06322, |
| // 0.01947, 0.06087, 0.74457, |
| { SkFixedToFloat(0x9c18), SkFixedToFloat(0x348d), SkFixedToFloat(0x2631) }, |
| { SkFixedToFloat(0x4fa5), SkFixedToFloat(0xa02c), SkFixedToFloat(0x102f) }, |
| { SkFixedToFloat(0x04fc), SkFixedToFloat(0x0f95), SkFixedToFloat(0xbe9c) }, |
| }}; |
| |
| static constexpr skcms_Matrix3x3 kDisplayP3 = {{ |
| { 0.515102f, 0.291965f, 0.157153f }, |
| { 0.241182f, 0.692236f, 0.0665819f }, |
| { -0.00104941f, 0.0418818f, 0.784378f }, |
| }}; |
| |
| static constexpr skcms_Matrix3x3 kRec2020 = {{ |
| { 0.673459f, 0.165661f, 0.125100f }, |
| { 0.279033f, 0.675338f, 0.0456288f }, |
| { -0.00193139f, 0.0299794f, 0.797162f }, |
| }}; |
| |
| static constexpr skcms_Matrix3x3 kXYZ = {{ |
| { 1.0f, 0.0f, 0.0f }, |
| { 0.0f, 1.0f, 0.0f }, |
| { 0.0f, 0.0f, 1.0f }, |
| }}; |
| |
| } // namespace SkNamedGamut |
| |
| class SK_API SkColorSpace : public SkNVRefCnt<SkColorSpace> { |
| public: |
| /** |
| * Create the sRGB color space. |
| */ |
| static sk_sp<SkColorSpace> MakeSRGB(); |
| |
| /** |
| * Colorspace with the sRGB primaries, but a linear (1.0) gamma. |
| */ |
| static sk_sp<SkColorSpace> MakeSRGBLinear(); |
| |
| /** |
| * Create an SkColorSpace from a transfer function and a row-major 3x3 transformation to XYZ. |
| */ |
| static sk_sp<SkColorSpace> MakeRGB(const skcms_TransferFunction& transferFn, |
| const skcms_Matrix3x3& toXYZ); |
| |
| /** |
| * Create an SkColorSpace from a parsed (skcms) ICC profile. |
| */ |
| static sk_sp<SkColorSpace> Make(const skcms_ICCProfile&); |
| |
| /** |
| * Convert this color space to an skcms ICC profile struct. |
| */ |
| void toProfile(skcms_ICCProfile*) const; |
| |
| /** |
| * Returns true if the color space gamma is near enough to be approximated as sRGB. |
| */ |
| bool gammaCloseToSRGB() const; |
| |
| /** |
| * Returns true if the color space gamma is linear. |
| */ |
| bool gammaIsLinear() const; |
| |
| /** |
| * Sets |fn| to the transfer function from this color space. Returns true if the transfer |
| * function can be represented as coefficients to the standard ICC 7-parameter equation. |
| * Returns false otherwise (eg, PQ, HLG). |
| */ |
| bool isNumericalTransferFn(skcms_TransferFunction* fn) const; |
| |
| /** |
| * Returns true and sets |toXYZD50|. |
| */ |
| bool toXYZD50(skcms_Matrix3x3* toXYZD50) const; |
| |
| /** |
| * Returns a hash of the gamut transformation to XYZ D50. Allows for fast equality checking |
| * of gamuts, at the (very small) risk of collision. |
| */ |
| uint32_t toXYZD50Hash() const { return fToXYZD50Hash; } |
| |
| /** |
| * Returns a color space with the same gamut as this one, but with a linear gamma. |
| */ |
| sk_sp<SkColorSpace> makeLinearGamma() const; |
| |
| /** |
| * Returns a color space with the same gamut as this one, but with the sRGB transfer |
| * function. |
| */ |
| sk_sp<SkColorSpace> makeSRGBGamma() const; |
| |
| /** |
| * Returns a color space with the same transfer function as this one, but with the primary |
| * colors rotated. In other words, this produces a new color space that maps RGB to GBR |
| * (when applied to a source), and maps RGB to BRG (when applied to a destination). |
| * |
| * This is used for testing, to construct color spaces that have severe and testable behavior. |
| */ |
| sk_sp<SkColorSpace> makeColorSpin() const; |
| |
| /** |
| * Returns true if the color space is sRGB. |
| * Returns false otherwise. |
| * |
| * This allows a little bit of tolerance, given that we might see small numerical error |
| * in some cases: converting ICC fixed point to float, converting white point to D50, |
| * rounding decisions on transfer function and matrix. |
| * |
| * This does not consider a 2.2f exponential transfer function to be sRGB. While these |
| * functions are similar (and it is sometimes useful to consider them together), this |
| * function checks for logical equality. |
| */ |
| bool isSRGB() const; |
| |
| /** |
| * Returns a serialized representation of this color space. |
| */ |
| sk_sp<SkData> serialize() const; |
| |
| /** |
| * If |memory| is nullptr, returns the size required to serialize. |
| * Otherwise, serializes into |memory| and returns the size. |
| */ |
| size_t writeToMemory(void* memory) const; |
| |
| static sk_sp<SkColorSpace> Deserialize(const void* data, size_t length); |
| |
| /** |
| * If both are null, we return true. If one is null and the other is not, we return false. |
| * If both are non-null, we do a deeper compare. |
| */ |
| static bool Equals(const SkColorSpace*, const SkColorSpace*); |
| |
| void transferFn(float gabcdef[7]) const; // DEPRECATED: Remove when webview usage is gone |
| void transferFn(skcms_TransferFunction* fn) const; |
| void invTransferFn(skcms_TransferFunction* fn) const; |
| void gamutTransformTo(const SkColorSpace* dst, skcms_Matrix3x3* src_to_dst) const; |
| |
| uint32_t transferFnHash() const { return fTransferFnHash; } |
| uint64_t hash() const { return (uint64_t)fTransferFnHash << 32 | fToXYZD50Hash; } |
| |
| private: |
| friend class SkColorSpaceSingletonFactory; |
| |
| SkColorSpace(const skcms_TransferFunction& transferFn, const skcms_Matrix3x3& toXYZ); |
| |
| void computeLazyDstFields() const; |
| |
| uint32_t fTransferFnHash; |
| uint32_t fToXYZD50Hash; |
| |
| skcms_TransferFunction fTransferFn; |
| skcms_Matrix3x3 fToXYZD50; |
| |
| mutable skcms_TransferFunction fInvTransferFn; |
| mutable skcms_Matrix3x3 fFromXYZD50; |
| mutable SkOnce fLazyDstFieldsOnce; |
| }; |
| |
| #endif |