color.hpp

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#pragma once

#include "exception.hpp"
#include <SDL_pixels.h>
#include <ostream>

namespace sdl
{
class Color : public SDL_Color
{
public:
    constexpr Color() : SDL_Color{0, 0, 0, 255} {}

    constexpr Color(Uint8 r, Uint8 g, Uint8 b, Uint8 a = 255)
        : SDL_Color{r, g, b, a}
    {
    }

    constexpr Color(Color const&) = default;

    constexpr Color(Color&&) = default;

    Color(Uint32 raw, SDL_PixelFormat const& format)
    {
        SDL_GetRGBA(raw, &format, &r, &g, &b, &a);
    }

    Color(Uint32 raw, Uint32 format)
    {
        auto f = SDL_AllocFormat(format);
        if (!f) throw Exception{"SDL_AllocFormat"};
        SDL_GetRGBA(raw, f, &r, &g, &b, &a);
        SDL_FreeFormat(f);
    }

    Color& operator=(Color const&) = default;

    Color& operator=(Color&&) = default;

    Uint32 as_uint(SDL_PixelFormat const& format) const
    {
        if (SDL_ISPIXELFORMAT_ALPHA(format.format))
        {
            return SDL_MapRGBA(&format, r, g, b, a);
        }
        else
        {
            return SDL_MapRGB(&format, r, g, b);
        }
    }

    Uint32 as_uint(Uint32 format) const
    {
        auto f = SDL_AllocFormat(format);
        if (!f) throw Exception{"SDL_AllocFormat"};
        auto raw = as_uint(*f);
        SDL_FreeFormat(f);
        return raw;
    }

    bool operator==(Color const& c) const
    {
        return r == c.r && g == c.g && b == c.b && a == c.a;
    }

    friend std::ostream& operator<<(std::ostream& stream, Color const& c)
    {
        return stream << "(r:" << c.r << ",g:" << c.g << ",b:" << c.b
                      << ",a:" << c.a << ")";
    }

    static constexpr Color White() { return {255, 255, 255, 255}; }
    static constexpr Color Black() { return {0, 0, 0, 255}; }
    static constexpr Color Red() { return {255, 0, 0, 255}; }
    static constexpr Color Green() { return {0, 255, 0, 255}; }
    static constexpr Color Blue() { return {0, 0, 255, 255}; }
    static constexpr Color Transparent() { return {0, 0, 0, 0}; }
};

} // namespace sdl