numbers.hpp

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// Copyright Take Vos 2021.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include <concepts>
 
namespace hi::inline v1 {
 
template<std::floating_point T>
constexpr auto points_per_inch_v = T{72.0};
 
template<std::floating_point T>
constexpr auto dp_per_inch_v = T{80.0};
 
template<std::floating_point T>
constexpr auto points_to_dp_scale_v = dp_per_inch_v<T> / points_per_inch_v<T>;
 
template<std::floating_point T>
constexpr T points_to_dp(T x) noexcept
{
    return x * points_to_dp_scale_v<T>;
}
 
constexpr double points_per_inch = points_per_inch_v<double>;
 
constexpr double dp_per_inch = dp_per_inch_v<double>;
 
} // namespace hi::inline v1