| /* |
| * Copyright (C) 2017-2021 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include <algorithm> |
| #include <array> |
| #include <cmath> |
| #include <tuple> |
| |
| namespace WebCore { |
| |
| template<typename T, size_t N> |
| struct ColorComponents { |
| constexpr static size_t Size = N; |
| |
| constexpr ColorComponents() |
| : components { } |
| { |
| } |
| |
| template<typename ...Ts> |
| constexpr ColorComponents(Ts ...input) |
| : components {{ input ... }} |
| { |
| static_assert(sizeof...(Ts) == N); |
| } |
| |
| template<typename F> |
| constexpr auto map(F&& function) const -> ColorComponents<decltype(function(std::declval<T>())), N>; |
| |
| constexpr ColorComponents& operator+=(const ColorComponents&); |
| |
| constexpr ColorComponents operator+(T) const; |
| constexpr ColorComponents operator/(T) const; |
| constexpr ColorComponents operator*(T) const; |
| |
| constexpr ColorComponents abs() const; |
| |
| constexpr T& operator[](size_t i) { return components[i]; } |
| constexpr const T& operator[](size_t i) const { return components[i]; } |
| |
| template<size_t I> |
| constexpr T get() const; |
| |
| template<size_t Start, size_t End> |
| constexpr ColorComponents<T, End - Start> subset() const; |
| |
| std::array<T, N> components; |
| }; |
| |
| template<typename T, typename ...Ts> |
| ColorComponents(T, Ts...) -> ColorComponents<T, 1 + sizeof...(Ts)>; |
| |
| template<typename F, typename T, typename... Ts> |
| constexpr auto mapColorComponents(F&& function, T component, Ts... components) -> ColorComponents<decltype(function(component[0], components[0]...)), T::Size> |
| { |
| static_assert(std::conjunction_v<std::bool_constant<Ts::Size == T::Size>...>, "All ColorComponents passed to mapColorComponents must have the same size"); |
| |
| ColorComponents<decltype(function(component[0], components[0]...)), T::Size> result; |
| for (std::remove_const_t<decltype(T::Size)> i = 0; i < T::Size; ++i) |
| result[i] = function(component[i], components[i]...); |
| return result; |
| } |
| |
| template<typename T, size_t N> |
| template<typename F> |
| constexpr auto ColorComponents<T, N>::map(F&& function) const -> ColorComponents<decltype(function(std::declval<T>())), N> |
| { |
| return mapColorComponents(std::forward<F>(function), *this); |
| } |
| |
| template<typename T, size_t N> |
| constexpr ColorComponents<T, N>& ColorComponents<T, N>::operator+=(const ColorComponents& rhs) |
| { |
| *this = mapColorComponents([](T c1, T c2) { return c1 + c2; }, *this, rhs); |
| return *this; |
| } |
| |
| template<typename T, size_t N> |
| constexpr ColorComponents<T, N> ColorComponents<T, N>::operator+(T rhs) const |
| { |
| return map([rhs](T c) { return c + rhs; }); |
| } |
| |
| template<typename T, size_t N> |
| constexpr ColorComponents<T, N> ColorComponents<T, N>::operator/(T denominator) const |
| { |
| return map([denominator](T c) { return c / denominator; }); |
| } |
| |
| template<typename T, size_t N> |
| constexpr ColorComponents<T, N> ColorComponents<T, N>::operator*(T factor) const |
| { |
| return map([factor](T c) { return c * factor; }); |
| } |
| |
| template<typename T, size_t N> |
| constexpr ColorComponents<T, N> ColorComponents<T, N>::abs() const |
| { |
| return map([](T c) { return std::abs(c); }); |
| } |
| |
| template<typename T, size_t N> |
| template<size_t I> |
| constexpr T ColorComponents<T, N>::get() const |
| { |
| return components[I]; |
| } |
| |
| template<typename T, size_t N> |
| template<size_t Start, size_t End> |
| constexpr ColorComponents<T, End - Start> ColorComponents<T, N>::subset() const |
| { |
| ColorComponents<T, End - Start> result; |
| for (size_t i = Start; i < End; ++i) |
| result[i - Start] = components[i]; |
| return result; |
| } |
| |
| template<typename T, size_t N> |
| constexpr ColorComponents<T, N> perComponentMax(const ColorComponents<T, N>& a, const ColorComponents<T, N>& b) |
| { |
| return mapColorComponents([](T c1, T c2) { return std::max(c1, c2); }, a, b); |
| } |
| |
| template<typename T, size_t N> |
| constexpr ColorComponents<T, N> perComponentMin(const ColorComponents<T, N>& a, const ColorComponents<T, N>& b) |
| { |
| return mapColorComponents([](T c1, T c2) { return std::min(c1, c2); }, a, b); |
| } |
| |
| template<typename T, size_t N> |
| constexpr bool operator==(const ColorComponents<T, N>& a, const ColorComponents<T, N>& b) |
| { |
| return a.components == b.components; |
| } |
| |
| template<typename T, size_t N> |
| constexpr bool operator!=(const ColorComponents<T, N>& a, const ColorComponents<T, N>& b) |
| { |
| return !(a == b); |
| } |
| |
| } // namespace WebCore |
| |
| namespace std { |
| |
| template<typename T, size_t N> |
| class tuple_size<WebCore::ColorComponents<T, N>> : public std::integral_constant<size_t, N> { |
| }; |
| |
| template<size_t I, typename T, size_t N> |
| class tuple_element<I, WebCore::ColorComponents<T, N>> { |
| public: |
| using type = T; |
| }; |
| |
| } |