Color.hh

 /*
 libSDL2pp - C++ bindings/wrapper for SDL2
 Copyright (C) 2017 Vraiment <jemc44@gmail.com>
 
 This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages
 arising from the use of this software.
 
 Permission is granted to anyone to use this software for any purpose,
 including commercial applications, and to alter it and redistribute it
 freely, subject to the following restrictions:
 
 1. The origin of this software must not be misrepresented; you must not
 claim that you wrote the original software. If you use this software
 in a product, an acknowledgment in the product documentation would be
 appreciated but is not required.
 2. Altered source versions must be plainly marked as such, and must not be
 misrepresented as being the original software.
 3. This notice may not be removed or altered from any source distribution.
 */
 
#ifndef SDL2PP_COLOR_HH
#define SDL2PP_COLOR_HH
 
#include <ostream>
 
#include <SDL_pixels.h>
 
#include <SDL2pp/Export.hh>
 
namespace SDL2pp {
 
class SDL2PP_EXPORT Color : public SDL_Color {
public:
    constexpr Color() : SDL_Color{0, 0, 0, 0} {
    }
 
    constexpr Color(const SDL_Color& color) : SDL_Color{color.r, color.g, color.b, color.a} {
    }
 
    constexpr Color(Uint8 r, Uint8 g, Uint8 b) : SDL_Color{r, g, b, SDL_ALPHA_OPAQUE} {
    }
 
    constexpr Color(Uint8 r, Uint8 g, Uint8 b, Uint8 a) : SDL_Color{r, g, b, a} {
    }
 
    Color(const Color&) noexcept = default;
 
    Color(Color&&) noexcept = default;
 
    Color& operator=(const Color&) noexcept = default;
 
    Color& operator=(Color&&) noexcept = default;
 
    constexpr Uint8 GetRed() const {
        return r;
    }
 
    Color& SetRed(int nr) {
        r = nr;
        return *this;
    }
 
    constexpr Uint8 GetGreen() const {
        return g;
    }
 
    Color& SetGreen(int ng) {
        g = ng;
        return *this;
    }
 
    constexpr Uint8 GetBlue() const {
        return b;
    }
 
    Color& SetBlue(int nb) {
        b = nb;
        return *this;
    }
 
    constexpr Uint8 GetAlpha() const {
        return a;
    }
 
    Color& SetAlpha(int na) {
        a = na;
        return *this;
    }
};
 
}
 
constexpr bool operator==(const SDL2pp::Color& a, const SDL2pp::Color& b) {
    return a.r == b.r && a.g == b.g && a.b == b.b && a.a == b.a;
}
 
constexpr bool operator!=(const SDL2pp::Color& a, const SDL2pp::Color& b) {
    return !(a == b);
}
 
SDL2PP_EXPORT std::ostream& operator<<(std::ostream& stream, const SDL2pp::Color& color);
 
namespace std {
 
template<>
struct hash<SDL2pp::Color> {
    size_t operator()(const SDL2pp::Color& c) const {
        size_t seed = std::hash<int>()(c.r);
        seed ^= std::hash<int>()(c.g) + 0x9e3779b9 + (seed<<6) + (seed>>2);
        seed ^= std::hash<int>()(c.b) + 0x9e3779b9 + (seed<<6) + (seed>>2);
        seed ^= std::hash<int>()(c.a) + 0x9e3779b9 + (seed<<6) + (seed>>2);
        return seed;
    }
};
 
}
 
#endif