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