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File indexing completed on 2025-09-15 08:59:51
0001 //------------------------------- -*- C++ -*- -------------------------------// 0002 // Copyright Celeritas contributors: see top-level COPYRIGHT file for details 0003 // SPDX-License-Identifier: (Apache-2.0 OR MIT) 0004 //---------------------------------------------------------------------------// 0005 //! \file geocel/rasterize/Color.hh 0006 //---------------------------------------------------------------------------// 0007 #pragma once 0008 0009 #include <cstdint> 0010 #include <string> 0011 #include <string_view> 0012 0013 #include "corecel/Assert.hh" 0014 #include "corecel/cont/Array.hh" 0015 0016 namespace celeritas 0017 { 0018 //---------------------------------------------------------------------------// 0019 /*! 0020 * Stora an RGBA color. 0021 * 0022 * This is used to define volume/material colors used for raytrace rendering. 0023 * The "byte" is the bit depth of a channel. 0024 */ 0025 class Color 0026 { 0027 public: 0028 //!@{ 0029 //! \name Type aliases 0030 using byte_type = std::uint8_t; 0031 using size_type = std::uint32_t; 0032 using Byte4 = Array<byte_type, 4>; 0033 //!@} 0034 0035 //! Little-endian indexing for RGBA 0036 enum class Channel 0037 { 0038 alpha, 0039 blue, 0040 green, 0041 red, 0042 size_ 0043 }; 0044 0045 public: 0046 // Construct with an \c #0178ef RGB string (100% opaque) 0047 static Color from_html(std::string_view rgb); 0048 0049 // Construct from an RGB hex value 0050 static Color from_rgb(size_type rgb); 0051 0052 // Construct from an RGBA hex value 0053 static Color from_rgba(size_type rgba); 0054 0055 // Construct with transparent black 0056 Color() = default; 0057 0058 //! Construct from an integer representation 0059 explicit CELER_CONSTEXPR_FUNCTION Color(size_type c) : color_{c} {} 0060 0061 //! Get an integer representation of the color 0062 explicit CELER_CONSTEXPR_FUNCTION operator size_type() const 0063 { 0064 return color_; 0065 } 0066 0067 // Get representation as HTML color \#RRGGBB 0068 std::string to_html() const; 0069 0070 // Get a single channel 0071 inline CELER_FUNCTION byte_type channel(Channel c) const; 0072 0073 private: 0074 //! Encoded color value 0075 size_type color_{0}; 0076 }; 0077 0078 //---------------------------------------------------------------------------// 0079 // INLINE DEFINITIONS 0080 //---------------------------------------------------------------------------// 0081 /*! 0082 * Get a single channel. 0083 */ 0084 CELER_FUNCTION auto Color::channel(Channel c) const -> byte_type 0085 { 0086 CELER_EXPECT(c < Channel::size_); 0087 size_type result = color_; 0088 result >>= (8 * static_cast<size_type>(c)); 0089 result &= 0xffu; 0090 return static_cast<byte_type>(result); 0091 } 0092 0093 //---------------------------------------------------------------------------// 0094 } // namespace celeritas
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