color.hpp

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/*--------------------------------------------------------------*
  Copyright (C) 2021 Rudy Castan
 
  This file is distributed WITHOUT ANY WARRANTY. See the file
  `License.md' for details.
*--------------------------------------------------------------*/
#pragma once
 
 
namespace doodle
{
    struct [[nodiscard]] Color
    {
    public:
        double red   = 0;
        double green = 0;
        double blue  = 0;
        double alpha = 255;
 
    public:
        constexpr Color() noexcept = default;
        explicit constexpr Color(double grey, double alpha = 255) noexcept
            : red(grey), green(grey), blue(grey), alpha(alpha)
        {
        }
        constexpr Color(double red, double green, double blue, double alpha = 255) noexcept
            : red(red), green(green), blue(blue), alpha(alpha)
        {
        }
    };
 
    class [[nodiscard]] HexColor
    {
    public:
        unsigned rgba = 0x000000ff;
 
        constexpr HexColor() noexcept = default;
        constexpr HexColor(unsigned hex) noexcept : rgba(hex) {}
        constexpr HexColor(int hex) noexcept : rgba(static_cast<unsigned>(hex)) {}
        constexpr operator Color() const noexcept
        {
            return Color{static_cast<double>((rgba & 0xff000000) >> 24),
                static_cast<double>((rgba & 0x00ff0000) >> 16),
                static_cast<double>((rgba & 0x0000ff00) >> 8),
                         static_cast<double>((rgba & 0x000000ff) >> 0)};
        }
    };
}