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 // Created by: NW,JPB,CAL
 // Copyright (c) 1991-1999 Matra Datavision
 // Copyright (c) 1999-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _Quantity_Color_HeaderFile
 #define _Quantity_Color_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 #include <Standard_HashUtils.hxx>
 #include <Standard_ShortReal.hxx>
 
 #include <Quantity_NameOfColor.hxx>
 #include <Quantity_TypeOfColor.hxx>
 #include <NCollection_Vec4.hxx>
 
 //! This class allows the definition of an RGB color as triplet of 3 normalized floating point values (red, green, blue).
 //!
 //! Although Quantity_Color can be technically used for pass-through storage of RGB triplet in any color space,
 //! other OCCT interfaces taking/returning Quantity_Color would expect them in linear space.
 //! Therefore, take a look into methods converting to and from non-linear sRGB color space, if needed;
 //! for instance, application usually providing color picking within 0..255 range in sRGB color space.
 class Quantity_Color
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   //! Creates Quantity_NOC_YELLOW color (for historical reasons).
   Quantity_Color() : myRgb (valuesOf (Quantity_NOC_YELLOW, Quantity_TOC_RGB)) {}
 
   //! Creates the color from enumeration value.
   Quantity_Color (const Quantity_NameOfColor theName) : myRgb (valuesOf (theName, Quantity_TOC_RGB)) {}
 
   //! Creates a color according to the definition system theType.
   //! Throws exception if values are out of range.
   Standard_EXPORT Quantity_Color (const Standard_Real theC1,
                                   const Standard_Real theC2,
                                   const Standard_Real theC3,
                                   const Quantity_TypeOfColor theType);
 
   //! Define color from linear RGB values.
   Standard_EXPORT explicit Quantity_Color (const NCollection_Vec3<float>& theRgb);
 
   //! Returns the name of the nearest color from the Quantity_NameOfColor enumeration.
   Standard_EXPORT Quantity_NameOfColor Name() const;
 
   //! Updates the color from specified named color.
   void SetValues (const Quantity_NameOfColor theName) { myRgb = valuesOf (theName, Quantity_TOC_RGB); }
 
   //! Return the color as vector of 3 float elements.
   const NCollection_Vec3<float>& Rgb () const { return myRgb; }
 
   //! Return the color as vector of 3 float elements.
   operator const NCollection_Vec3<float>&() const { return myRgb; }
 
   //! Returns in theC1, theC2 and theC3 the components of this color
   //! according to the color system definition theType.
   Standard_EXPORT void Values (Standard_Real& theC1,
                                Standard_Real& theC2,
                                Standard_Real& theC3,
                                const Quantity_TypeOfColor theType) const;
 
   //! Updates a color according to the mode specified by theType.
   //! Throws exception if values are out of range.
   Standard_EXPORT void SetValues (const Standard_Real theC1,
                                   const Standard_Real theC2,
                                   const Standard_Real theC3,
                                   const Quantity_TypeOfColor theType);
 
   //! Returns the Red component (quantity of red) of the color within range [0.0; 1.0].
   Standard_Real Red() const { return myRgb.r(); }
 
   //! Returns the Green component (quantity of green) of the color within range [0.0; 1.0].
   Standard_Real Green() const { return myRgb.g(); }
 
   //! Returns the Blue component (quantity of blue) of the color within range [0.0; 1.0].
   Standard_Real Blue() const { return myRgb.b(); }
 
   //! Returns the Hue component (hue angle) of the color
   //! in degrees within range [0.0; 360.0], 0.0 being Red.
   //! -1.0 is a special value reserved for grayscale color (S should be 0.0)
   Standard_Real Hue() const { return Convert_LinearRGB_To_HLS (myRgb)[0]; }
 
   //! Returns the Light component (value of the lightness) of the color within range [0.0; 1.0].
   Standard_Real Light() const { return Convert_LinearRGB_To_HLS (myRgb)[1]; }
 
   //! Increases or decreases the intensity (variation of the lightness).
   //! The delta is a percentage. Any value greater than zero will increase the intensity.
   //! The variation is expressed as a percentage of the current value.
   Standard_EXPORT void ChangeIntensity (const Standard_Real theDelta);
 
   //! Returns the Saturation component (value of the saturation) of the color within range [0.0; 1.0].
   Standard_Real Saturation() const { return Convert_LinearRGB_To_HLS (myRgb)[2]; }
 
   //! Increases or decreases the contrast (variation of the saturation).
   //! The delta is a percentage. Any value greater than zero will increase the contrast.
   //! The variation is expressed as a percentage of the current value.
   Standard_EXPORT void ChangeContrast (const Standard_Real theDelta);
 
   //! Returns TRUE if the distance between two colors is greater than Epsilon().
   Standard_Boolean IsDifferent (const Quantity_Color& theOther) const { return (SquareDistance (theOther) > Epsilon() * Epsilon()); }
 
   //! Alias to IsDifferent().
   Standard_Boolean operator!=  (const Quantity_Color& theOther) const { return IsDifferent (theOther); }
 
   //! Returns TRUE if the distance between two colors is no greater than Epsilon().
   Standard_Boolean IsEqual    (const Quantity_Color& theOther) const { return (SquareDistance (theOther) <= Epsilon() * Epsilon()); }
 
   //! Alias to IsEqual().
   Standard_Boolean operator== (const Quantity_Color& theOther) const { return IsEqual (theOther); }
   
   //! Returns the distance between two colors. It's a value between 0 and the square root of 3 (the black/white distance).
   Standard_Real Distance (const Quantity_Color& theColor) const
   {
     return (NCollection_Vec3<Standard_Real> (myRgb) - NCollection_Vec3<Standard_Real> (theColor.myRgb)).Modulus();
   }
 
   //! Returns the square of distance between two colors.
   Standard_Real SquareDistance (const Quantity_Color& theColor) const
   {
     return (NCollection_Vec3<Standard_Real> (myRgb) - NCollection_Vec3<Standard_Real> (theColor.myRgb)).SquareModulus();
   }
 
   //! Returns the percentage change of contrast and intensity between this and another color.
   //! <DC> and <DI> are percentages, either positive or negative.
   //! The calculation is with respect to this color.
   //! If <DC> is positive then <me> is more contrasty.
   //! If <DI> is positive then <me> is more intense.
   Standard_EXPORT void Delta (const Quantity_Color& theColor,
                               Standard_Real& DC, Standard_Real& DI) const;
 
   //! Returns the value of the perceptual difference between this color
   //! and @p theOther, computed using the CIEDE2000 formula.
   //! The difference is in range [0, 100.], with 1 approximately corresponding
   //! to the minimal percievable difference (usually difference 5 or greater is
   //! needed for the difference to be recognizable in practice).
   Standard_EXPORT Standard_Real DeltaE2000 (const Quantity_Color& theOther) const;
 
 public:
 
   //! Returns the color from Quantity_NameOfColor enumeration nearest to specified RGB values.
   static Quantity_NameOfColor Name (const Standard_Real theR, const Standard_Real theG, const Standard_Real theB)
   {
     const Quantity_Color aColor (theR, theG, theB, Quantity_TOC_RGB);
     return aColor.Name();
   }
 
   //! Returns the name of the color identified by the given Quantity_NameOfColor enumeration value.
   Standard_EXPORT static Standard_CString StringName (const Quantity_NameOfColor theColor);
 
   //! Finds color from predefined names.
   //! For example, the name of the color which corresponds to "BLACK" is Quantity_NOC_BLACK.
   //! Returns FALSE if name is unknown.
   Standard_EXPORT static Standard_Boolean ColorFromName (const Standard_CString theName, Quantity_NameOfColor& theColor);
 
   //! Finds color from predefined names.
   //! @param theColorNameString the color name
   //! @param theColor a found color
   //! @return false if the color name is unknown, or true if the search by color name was successful
   static Standard_Boolean ColorFromName (const Standard_CString theColorNameString, Quantity_Color& theColor)
   {
     Quantity_NameOfColor aColorName = Quantity_NOC_BLACK;
     if (!ColorFromName (theColorNameString, aColorName))
     {
       return false;
     }
     theColor = aColorName;
     return true;
   }
 
 public:
   //!@name Routines converting colors between different encodings and color spaces
 
   //! Parses the string as a hex color (like "#FF0" for short sRGB color, or "#FFFF00" for sRGB color)
   //! @param theHexColorString the string to be parsed
   //! @param theColor a color that is a result of parsing
   //! @return true if parsing was successful, or false otherwise
   Standard_EXPORT static bool ColorFromHex (const Standard_CString theHexColorString, Quantity_Color& theColor);
 
   //! Returns hex sRGB string in format "#FFAAFF".
   static TCollection_AsciiString ColorToHex (const Quantity_Color& theColor,
                                              const bool theToPrefixHash = true)
   {
     NCollection_Vec3<Standard_ShortReal> anSRgb = Convert_LinearRGB_To_sRGB ((NCollection_Vec3<Standard_ShortReal> )theColor);
     NCollection_Vec3<Standard_Integer> anSRgbInt (anSRgb * 255.0f + NCollection_Vec3<Standard_ShortReal> (0.5f));
     char aBuff[10];
     Sprintf (aBuff, theToPrefixHash ? "#%02X%02X%02X" : "%02X%02X%02X",
              anSRgbInt.r(), anSRgbInt.g(), anSRgbInt.b());
     return aBuff;
   }
 
   //! Converts sRGB components into HLS ones.
   Standard_EXPORT static NCollection_Vec3<float> Convert_sRGB_To_HLS (const NCollection_Vec3<float>& theRgb);
 
   //! Converts HLS components into RGB ones.
   Standard_EXPORT static NCollection_Vec3<float> Convert_HLS_To_sRGB (const NCollection_Vec3<float>& theHls);
 
   //! Converts Linear RGB components into HLS ones.
   static NCollection_Vec3<float> Convert_LinearRGB_To_HLS (const NCollection_Vec3<float>& theRgb)
   {
     return Convert_sRGB_To_HLS (Convert_LinearRGB_To_sRGB (theRgb));
   }
 
   //! Converts HLS components into linear RGB ones.
   static NCollection_Vec3<float> Convert_HLS_To_LinearRGB (const NCollection_Vec3<float>& theHls)
   {
     return Convert_sRGB_To_LinearRGB (Convert_HLS_To_sRGB (theHls));
   }
 
   //! Converts linear RGB components into CIE Lab ones.
   Standard_EXPORT static NCollection_Vec3<float> Convert_LinearRGB_To_Lab (const NCollection_Vec3<float>& theRgb);
 
   //! Converts CIE Lab components into CIE Lch ones.
   Standard_EXPORT static NCollection_Vec3<float> Convert_Lab_To_Lch (const NCollection_Vec3<float>& theLab);
 
   //! Converts CIE Lab components into linear RGB ones.
   //! Note that the resulting values may be out of the valid range for RGB.
   Standard_EXPORT static NCollection_Vec3<float> Convert_Lab_To_LinearRGB (const NCollection_Vec3<float>& theLab);
 
   //! Converts CIE Lch components into CIE Lab ones.
   Standard_EXPORT static NCollection_Vec3<float> Convert_Lch_To_Lab (const NCollection_Vec3<float>& theLch);
 
   //! Convert the color value to ARGB integer value, with alpha equals to 0.
   //! So the output is formatted as 0x00RRGGBB.
   //! Note that this unpacking does NOT involve non-linear sRGB -> linear RGB conversion,
   //! as would be usually expected for RGB color packed into 4 bytes.
   //! @param theColor [in] color to convert
   //! @param theARGB [out] result color encoded as integer
   static void Color2argb (const Quantity_Color& theColor,
                           Standard_Integer& theARGB)
   {
     const NCollection_Vec3<Standard_Integer> aColor (static_cast<Standard_Integer> (255.0f * theColor.myRgb.r() + 0.5f),
                                                      static_cast<Standard_Integer> (255.0f * theColor.myRgb.g() + 0.5f),
                                                      static_cast<Standard_Integer> (255.0f * theColor.myRgb.b() + 0.5f));
     theARGB = (((aColor.r() & 0xff) << 16)
              | ((aColor.g() & 0xff) << 8)
              |  (aColor.b() & 0xff));
   }
 
   //! Convert integer ARGB value to Color. Alpha bits are ignored.
   //! Note that this packing does NOT involve linear -> non-linear sRGB conversion,
   //! as would be usually expected to preserve higher (for human eye) color precision in 4 bytes.
   static void Argb2color (const Standard_Integer theARGB,
                           Quantity_Color& theColor)
   {
     const NCollection_Vec3<Standard_Real> aColor (static_cast <Standard_Real> ((theARGB & 0xff0000) >> 16),
                                                   static_cast <Standard_Real> ((theARGB & 0x00ff00) >> 8),
                                                   static_cast <Standard_Real> ((theARGB & 0x0000ff)));
     theColor.SetValues (aColor.r() / 255.0, aColor.g() / 255.0, aColor.b() / 255.0, Quantity_TOC_sRGB);
   }
 
   //! Convert linear RGB component into sRGB using OpenGL specs formula (double precision), also known as gamma correction.
   static Standard_Real Convert_LinearRGB_To_sRGB (Standard_Real theLinearValue)
   {
     return theLinearValue <= 0.0031308
          ? theLinearValue * 12.92
          : Pow (theLinearValue, 1.0/2.4) * 1.055 - 0.055;
   }
 
   //! Convert linear RGB component into sRGB using OpenGL specs formula (single precision), also known as gamma correction.
   static float Convert_LinearRGB_To_sRGB (float theLinearValue)
   {
     return theLinearValue <= 0.0031308f
          ? theLinearValue * 12.92f
          : powf (theLinearValue, 1.0f/2.4f) * 1.055f - 0.055f;
   }
 
   //! Convert sRGB component into linear RGB using OpenGL specs formula (double precision), also known as gamma correction.
   static Standard_Real Convert_sRGB_To_LinearRGB (Standard_Real thesRGBValue)
   {
     return thesRGBValue <= 0.04045
          ? thesRGBValue / 12.92
          : Pow ((thesRGBValue + 0.055) / 1.055, 2.4);
   }
 
   //! Convert sRGB component into linear RGB using OpenGL specs formula (single precision), also known as gamma correction.
   static float Convert_sRGB_To_LinearRGB (float thesRGBValue)
   {
     return thesRGBValue <= 0.04045f
          ? thesRGBValue / 12.92f
          : powf ((thesRGBValue + 0.055f) / 1.055f, 2.4f);
   }
 
   //! Convert linear RGB components into sRGB using OpenGL specs formula.
   template<typename T>
   static NCollection_Vec3<T> Convert_LinearRGB_To_sRGB (const NCollection_Vec3<T>& theRGB)
   {
     return NCollection_Vec3<T> (Convert_LinearRGB_To_sRGB (theRGB.r()),
                                 Convert_LinearRGB_To_sRGB (theRGB.g()),
                                 Convert_LinearRGB_To_sRGB (theRGB.b()));
   }
 
   //! Convert sRGB components into linear RGB using OpenGL specs formula.
   template<typename T>
   static NCollection_Vec3<T> Convert_sRGB_To_LinearRGB (const NCollection_Vec3<T>& theRGB)
   {
     return NCollection_Vec3<T> (Convert_sRGB_To_LinearRGB (theRGB.r()),
                                 Convert_sRGB_To_LinearRGB (theRGB.g()),
                                 Convert_sRGB_To_LinearRGB (theRGB.b()));
   }
 
   //! Convert linear RGB component into sRGB using approximated uniform gamma coefficient 2.2.
   static float Convert_LinearRGB_To_sRGB_approx22 (float theLinearValue) { return powf (theLinearValue, 2.2f); }
 
   //! Convert sRGB component into linear RGB using approximated uniform gamma coefficient 2.2
   static float Convert_sRGB_To_LinearRGB_approx22 (float thesRGBValue) { return powf (thesRGBValue, 1.0f/2.2f); }
 
   //! Convert linear RGB components into sRGB using approximated uniform gamma coefficient 2.2
   static NCollection_Vec3<float> Convert_LinearRGB_To_sRGB_approx22 (const NCollection_Vec3<float>& theRGB)
   {
     return NCollection_Vec3<float> (Convert_LinearRGB_To_sRGB_approx22 (theRGB.r()),
                                     Convert_LinearRGB_To_sRGB_approx22 (theRGB.g()),
                                     Convert_LinearRGB_To_sRGB_approx22 (theRGB.b()));
   }
 
   //! Convert sRGB components into linear RGB using approximated uniform gamma coefficient 2.2
   static NCollection_Vec3<float> Convert_sRGB_To_LinearRGB_approx22 (const NCollection_Vec3<float>& theRGB)
   {
     return NCollection_Vec3<float> (Convert_sRGB_To_LinearRGB_approx22 (theRGB.r()),
                                     Convert_sRGB_To_LinearRGB_approx22 (theRGB.g()),
                                     Convert_sRGB_To_LinearRGB_approx22 (theRGB.b()));
   }
 
   //! Converts HLS components into sRGB ones.
   static void HlsRgb (const Standard_Real theH, const Standard_Real theL, const Standard_Real theS,
                       Standard_Real& theR, Standard_Real& theG, Standard_Real& theB)
   {
     const NCollection_Vec3<float> anRgb = Convert_HLS_To_sRGB (NCollection_Vec3<float> ((float )theH, (float )theL, (float )theS));
     theR = anRgb[0];
     theG = anRgb[1];
     theB = anRgb[2];
   }
 
   //! Converts sRGB components into HLS ones.
   static void RgbHls (const Standard_Real theR, const Standard_Real theG, const Standard_Real theB,
                       Standard_Real& theH, Standard_Real& theL, Standard_Real& theS)
   {
     const NCollection_Vec3<float> aHls = Convert_sRGB_To_HLS (NCollection_Vec3<float> ((float )theR, (float )theG, (float )theB));
     theH = aHls[0];
     theL = aHls[1];
     theS = aHls[2];
   }
 
 public:
 
   //! Returns the value used to compare two colors for equality; 0.0001 by default.
   Standard_EXPORT static Standard_Real Epsilon();
 
   //! Set the value used to compare two colors for equality.
   Standard_EXPORT static void SetEpsilon (const Standard_Real theEpsilon);
 
   //! Dumps the content of me into the stream
   Standard_EXPORT void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const;
 
   //! Inits the content of me from the stream
   Standard_EXPORT Standard_Boolean InitFromJson (const Standard_SStream& theSStream, Standard_Integer& theStreamPos);
 
 private:
 
   //! Returns the values of a predefined color according to the mode.
   Standard_EXPORT static NCollection_Vec3<float> valuesOf (const Quantity_NameOfColor theName,
                                                            const Quantity_TypeOfColor theType);
 
 private:
 
   NCollection_Vec3<float> myRgb;
 
 };
 
 namespace std
 {
   template <>
   struct hash<Quantity_Color>
   {
     std::size_t operator()(const Quantity_Color& theColor) const noexcept
     {
       unsigned char aByteArr[3] = { static_cast<unsigned char>(255 * theColor.Red()),
                                     static_cast<unsigned char>(255 * theColor.Green()),
                                     static_cast<unsigned char>(255 * theColor.Blue()) };
       return opencascade::hashBytes(aByteArr, sizeof(aByteArr));
     }
   };
 }
 
 #endif // _Quantity_Color_HeaderFile

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