Rgba.hpp

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// Copyright 2024-2026 Jan Niklas Hasse <jhasse@bixense.com>
// For conditions of distribution and use, see copyright notice in LICENSE.txt
#pragma once
 
#include "Rgb.hpp"
 
#include <cstdint>
 
namespace jngl {
class Alpha;
 
class Rgba {
public:
    constexpr Rgba(float red, float green, float blue, float alpha)
    : red(red), green(green), blue(blue), alpha(alpha) {
    }
    Rgba(float red, float green, float blue, Alpha alpha);
    Rgba(Rgb, Alpha);
 
    constexpr static Rgba u8(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha) {
        return Rgba{ static_cast<float>(red) / 255.f, static_cast<float>(green) / 255.f,
                     static_cast<float>(blue) / 255.f, static_cast<float>(alpha) / 255.f };
    }
 
    constexpr float getRed() const {
        return red;
    }
    void setRed(float);
 
    constexpr float getGreen() const {
        return green;
    }
    void setGreen(float);
 
    constexpr float getBlue() const {
        return blue;
    }
    void setBlue(float);
 
    constexpr float getAlpha() const {
        return alpha;
    }
    void setAlpha(float);
    void setAlpha(Alpha);
 
    void setRgb(Rgb color);
 
    explicit operator Rgb() const;
 
private:
    float red;
    float green;
    float blue;
    float alpha;
};
 
Rgba mix(Rgba a, Rgba b, float t);
 
[[deprecated("Use mix instead")]]
inline Rgba interpolate(Rgba a, Rgba b, float t) {
    return mix(a, b, t);
}
 
} // namespace jngl
 
jngl::Rgba operator""_rgba(unsigned long long);
 
namespace jngl::internal {
// Intentionally declared but not defined — see Rgb.hpp for the pattern.
void invalid_rgba_color_literal_expected_format_hash_rrggbbaa();
} // namespace jngl::internal
 
consteval jngl::Rgba operator""_rgba(const char* hex, size_t length) {
    using jngl::internal::hexByte;
    if (length == 9 && hex[0] == '#') {
        return jngl::Rgba::u8(hexByte(hex + 1), hexByte(hex + 3), hexByte(hex + 5),
                              hexByte(hex + 7));
    }
    jngl::internal::invalid_rgba_color_literal_expected_format_hash_rrggbbaa();
    return jngl::Rgba{ 0, 0, 0, 0 };
}