/* SPDX-FileCopyrightText: 2023 Xaver Hugl SPDX-License-Identifier: GPL-2.0-or-later */ #pragma once #include #include #include #include "kwin_export.h" namespace KWin { /** * rendering intents describe how colors should be mapped between different color spaces */ enum class RenderingIntent { /* "vendor specific", preserves the overall color appearance */ Perceptual, /* "vendor specific", maps saturated colors to be saturated in the target color space too */ // TODO Saturation, /* colorimetric mapping between color spaces, with whitepoint adaptation */ RelativeColorimetric, /* colorimetric mapping between color spaces, without whitepoint adaptation */ AbsoluteColorimetric, /* colorimetric mapping between color spaces, with whitepoint adaptation and black point compensation */ RelativeColorimetricWithBPC, }; enum class NamedColorimetry { BT709, PAL_M, PAL, NTSC, GenericFilm, BT2020, CIEXYZ, DCIP3, DisplayP3, AdobeRGB }; struct XYZ; /** * xyY, with Y unspecified */ struct KWIN_EXPORT xy { double x; double y; XYZ toXYZ() const; QVector2D asVector() const; bool operator==(const xy &other) const; }; struct KWIN_EXPORT xyY { double x; double y; double Y; XYZ toXYZ() const; bool operator==(const xyY &other) const; }; struct KWIN_EXPORT XYZ { double X; double Y; double Z; xyY toxyY() const; xy toxy() const; QVector3D asVector() const; XYZ operator*(double factor) const; XYZ operator/(double factor) const; XYZ operator+(const XYZ &other) const; bool operator==(const XYZ &other) const; static XYZ fromVector(const QVector3D &vector); }; /** * Describes the definition of colors in a color space. * Red, green and blue define the chromaticities ("absolute colors") of the red, green and blue LEDs on a display in xy coordinates * White defines the the chromaticity of the reference white in xy coordinates */ class KWIN_EXPORT Colorimetry { public: static const Colorimetry &fromName(NamedColorimetry name); /** * @returns a matrix adapting XYZ values from the source whitepoint to the destination whitepoint with the Bradford transform */ static QMatrix4x4 chromaticAdaptationMatrix(XYZ sourceWhitepoint, XYZ destinationWhitepoint); static QMatrix4x4 calculateToXYZMatrix(XYZ red, XYZ green, XYZ blue, XYZ white); /** * checks if the colorimetry is sane and won't cause crashes or glitches */ static bool isValid(xy red, xy green, xy blue, xy white); /** * checks if the colorimetry could be from a real display */ static bool isReal(xy red, xy green, xy blue, xy white); explicit Colorimetry(XYZ red, XYZ green, XYZ blue, XYZ white); explicit Colorimetry(xyY red, xyY green, xyY blue, xyY white); explicit Colorimetry(xy red, xy green, xy blue, xy white); /** * @returns a matrix that transforms from the linear RGB representation of colors in this colorimetry to the XYZ representation */ const QMatrix4x4 &toXYZ() const; /** * @returns a matrix that transforms from the XYZ representation to the linear RGB representation of colors in this colorimetry */ const QMatrix4x4 &fromXYZ() const; QMatrix4x4 toLMS() const; QMatrix4x4 fromLMS() const; bool operator==(const Colorimetry &other) const; bool operator==(NamedColorimetry name) const; /** * @returns this colorimetry, adapted to the new whitepoint using the Bradford transform */ Colorimetry adaptedTo(xyY newWhitepoint) const; /** * replaces the current whitepoint with the new one * this does not do whitepoint adaptation! */ Colorimetry withWhitepoint(xyY newWhitePoint) const; /** * interpolates the primaries depending on the passed factor. The whitepoint stays unchanged */ Colorimetry interpolateGamutTo(const Colorimetry &one, double factor) const; QMatrix4x4 relativeColorimetricTo(const Colorimetry &other) const; const XYZ &red() const; const XYZ &green() const; const XYZ &blue() const; const XYZ &white() const; std::optional name() const; private: XYZ m_red; XYZ m_green; XYZ m_blue; XYZ m_white; QMatrix4x4 m_toXYZ; QMatrix4x4 m_fromXYZ; }; /** * Describes an EOTF - how encoded values are converted to light */ class KWIN_EXPORT TransferFunction { public: enum Type { sRGB = 0, linear = 1, PerceptualQuantizer = 2, gamma22 = 3, }; explicit TransferFunction(Type tf); explicit TransferFunction(Type tf, double minLuminance, double maxLuminance); bool operator==(const TransferFunction &) const; bool isRelative() const; TransferFunction relativeScaledTo(double referenceLuminance) const; double encodedToNits(double encoded) const; double nitsToEncoded(double nits) const; QVector3D encodedToNits(const QVector3D &encoded) const; QVector3D nitsToEncoded(const QVector3D &nits) const; QVector4D encodedToNits(const QVector4D &encoded) const; QVector4D nitsToEncoded(const QVector4D &nits) const; Type type; /** * the luminance at encoded value zero */ double minLuminance; /** * the luminance at encoded value 1 */ double maxLuminance; static double defaultMinLuminanceFor(Type type); static double defaultMaxLuminanceFor(Type type); static double defaultReferenceLuminanceFor(Type type); }; /** * Describes the meaning of encoded color values, with additional metadata for how to convert between different encodings * Note that not all properties of this description are relevant in all contexts */ class KWIN_EXPORT ColorDescription { public: /** * @param containerColorimetry the container colorimety of this description * @param tf the transfer function of this description * @param referenceLuminance the brightness of SDR content * @param minLuminance the minimum brightness of HDR content * @param maxAverageLuminance the maximum brightness of HDR content, if the whole screen is white * @param maxHdrLuminance the maximum brightness of HDR content, for a small part of the screen only * @param sdrColorimetry */ explicit ColorDescription(const Colorimetry &containerColorimetry, TransferFunction tf, double referenceLuminance, double minLuminance, std::optional maxAverageLuminance, std::optional maxHdrLuminance); explicit ColorDescription(NamedColorimetry containerColorimetry, TransferFunction tf, double referenceLuminance, double minLuminance, std::optional maxAverageLuminance, std::optional maxHdrLuminance); explicit ColorDescription(const Colorimetry &containerColorimetry, TransferFunction tf, double referenceLuminance, double minLuminance, std::optional maxAverageLuminance, std::optional maxHdrLuminance, std::optional masteringColorimetry, const Colorimetry &sdrColorimetry); explicit ColorDescription(NamedColorimetry containerColorimetry, TransferFunction tf, double referenceLuminance, double minLuminance, std::optional maxAverageLuminance, std::optional maxHdrLuminance, std::optional masteringColorimetry, const Colorimetry &sdrColorimetry); /** * The primaries and whitepoint that colors are encoded for. This is used to convert between different colorspaces. * In most cases this will be the rec.709 primaries for SDR, or rec.2020 for HDR */ const Colorimetry &containerColorimetry() const; /** * The mastering colorimetry contains all colors that the image actually (may) contain, which can be used to improve the conversion to a different color description. * In most cases this will be smaller than the container colorimetry; for example a screen with an HDR mode but only rec.709 colors would have a container colorimetry of rec.2020 and a mastering colorimetry of rec.709. * In some cases however it can be bigger than the container colorimetry, like with scRGB. It has the container colorimetry of sRGB, but a mastering colorimetry that can be bigger (like rec.2020 for example) */ const std::optional &masteringColorimetry() const; const Colorimetry &sdrColorimetry() const; TransferFunction transferFunction() const; double referenceLuminance() const; double minLuminance() const; std::optional maxAverageLuminance() const; std::optional maxHdrLuminance() const; bool operator==(const ColorDescription &other) const = default; ColorDescription withTransferFunction(const TransferFunction &func) const; /** * replaces the current whitepoint with the new one * this does not do whitepoint adaptation! */ ColorDescription withWhitepoint(xyY newWhitePoint) const; ColorDescription dimmed(double brightnessFactor) const; /** * @returns a matrix that transforms from linear RGB in this color description to linear RGB in the other one */ QMatrix4x4 toOther(const ColorDescription &other, RenderingIntent intent) const; QVector3D mapTo(QVector3D rgb, const ColorDescription &other, RenderingIntent intent) const; /** * This color description describes display-referred sRGB, with a gamma22 transfer function */ static const ColorDescription sRGB; private: Colorimetry m_containerColorimetry; std::optional m_masteringColorimetry; TransferFunction m_transferFunction; Colorimetry m_sdrColorimetry; double m_referenceLuminance; double m_minLuminance; std::optional m_maxAverageLuminance; std::optional m_maxHdrLuminance; }; } KWIN_EXPORT QDebug operator<<(QDebug debug, const KWin::TransferFunction &tf); KWIN_EXPORT QDebug operator<<(QDebug debug, const KWin::XYZ &xyz); KWIN_EXPORT QDebug operator<<(QDebug debug, const KWin::xyY &xyY); KWIN_EXPORT QDebug operator<<(QDebug debug, const KWin::xy &xy); KWIN_EXPORT QDebug operator<<(QDebug debug, const KWin::Colorimetry &color); KWIN_EXPORT QDebug operator<<(QDebug debug, const KWin::ColorDescription &color);