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LibWeb: Use fixed-point saturated arithmetics for CSSPixels
Using fixed-point saturated arithmetics for CSSPixels allows to avoid accumulating floating-point errors. This implementation is not complete yet: currently saturated arithmetics implemented only for addition. But it is enough to not regress any of layout tests we have :) See https://github.com/SerenityOS/serenity/issues/18566
This commit is contained in:
Aliaksandr Kalenik
Andreas Kling
parent
5cdd03fc53
commit
bec07d4af7
136 changed files with 1938 additions and 1844 deletions
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@ -1,4 +1,6 @@
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/*
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* Copyright (c) 2023, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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* Copyright (c) 2012-2023, Apple Inc. All rights reserved.
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* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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@ -50,154 +52,78 @@ constexpr DevicePixels operator%(DevicePixels left, T right) { return left.value
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/// See https://www.w3.org/TR/css-values-3/#reference-pixel
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class CSSPixels {
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public:
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constexpr CSSPixels() = default;
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CSSPixels() = default;
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CSSPixels(int value);
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CSSPixels(unsigned int value);
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CSSPixels(unsigned long value);
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CSSPixels(float value);
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CSSPixels(double value);
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constexpr CSSPixels(double value)
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: m_value { value }
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{
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}
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float to_float() const;
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double to_double() const;
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int to_int() const;
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constexpr float to_float() const
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{
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return static_cast<float>(m_value);
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}
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inline int raw_value() const { return m_value; }
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inline void set_raw_value(int value) { m_value = value; }
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constexpr double to_double() const
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{
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return static_cast<double>(m_value);
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}
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bool might_be_saturated() const;
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constexpr int to_int() const
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{
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return static_cast<int>(m_value);
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}
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bool operator==(CSSPixels const& other) const;
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constexpr bool operator==(CSSPixels const& other) const
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{
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return this->m_value == other.m_value;
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}
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explicit operator double() const { return to_double(); }
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constexpr explicit operator double() const
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{
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return to_double();
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}
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CSSPixels& operator++();
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CSSPixels& operator--();
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constexpr CSSPixels& operator++()
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{
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this->m_value += 1;
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return *this;
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}
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constexpr CSSPixels operator++(int)
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{
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CSSPixels ret = this->m_value;
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this->m_value += 1;
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return ret;
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}
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constexpr CSSPixels& operator--()
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{
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this->m_value -= 1;
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return *this;
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}
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constexpr CSSPixels operator--(int)
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{
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CSSPixels ret = this->m_value;
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this->m_value -= 1;
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return ret;
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}
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int operator<=>(CSSPixels const& other) const;
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constexpr int operator<=>(CSSPixels const& other) const
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{
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return this->m_value > other.m_value ? 1 : this->m_value < other.m_value ? -1
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: 0;
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}
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CSSPixels operator+() const;
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CSSPixels operator-() const;
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constexpr CSSPixels operator+(CSSPixels const& other) const
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{
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return this->m_value + other.m_value;
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}
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CSSPixels operator+(CSSPixels const& other) const;
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CSSPixels operator-(CSSPixels const& other) const;
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CSSPixels operator*(CSSPixels const& other) const;
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CSSPixels operator/(CSSPixels const& other) const;
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constexpr CSSPixels operator-(CSSPixels const& other) const
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{
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return this->m_value - other.m_value;
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}
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CSSPixels& operator+=(CSSPixels const& other);
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CSSPixels& operator-=(CSSPixels const& other);
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CSSPixels& operator*=(CSSPixels const& other);
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CSSPixels& operator/=(CSSPixels const& other);
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constexpr CSSPixels operator+() const
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{
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return +this->m_value;
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}
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CSSPixels abs() const;
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constexpr CSSPixels operator-() const
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{
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return -this->m_value;
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}
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constexpr CSSPixels operator*(CSSPixels const& other) const
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{
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return this->m_value * other.m_value;
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}
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constexpr CSSPixels operator/(CSSPixels const& other) const
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{
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return this->m_value / other.m_value;
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}
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constexpr CSSPixels& operator+=(CSSPixels const& other)
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{
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this->m_value += other.m_value;
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return *this;
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}
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constexpr CSSPixels& operator-=(CSSPixels const& other)
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{
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this->m_value -= other.m_value;
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return *this;
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}
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constexpr CSSPixels& operator*=(CSSPixels const& other)
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{
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this->m_value *= other.m_value;
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return *this;
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}
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constexpr CSSPixels& operator/=(CSSPixels const& other)
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{
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this->m_value /= other.m_value;
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return *this;
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}
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static float epsilon();
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private:
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double m_value {};
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i32 m_value { 0 };
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};
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template<Arithmetic T>
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constexpr bool operator==(CSSPixels left, T right) { return left.to_double() == right; }
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inline bool operator==(CSSPixels left, int right) { return left == CSSPixels(right); }
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inline bool operator==(CSSPixels left, float right) { return left.to_float() == right; }
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inline bool operator==(CSSPixels left, double right) { return left.to_double() == right; }
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template<Arithmetic T>
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constexpr bool operator!=(CSSPixels left, T right) { return left.to_double() != right; }
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inline bool operator>(CSSPixels left, int right) { return left > CSSPixels(right); }
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inline bool operator>(CSSPixels left, float right) { return left.to_float() > right; }
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inline bool operator>(CSSPixels left, double right) { return left.to_double() > right; }
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template<Arithmetic T>
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constexpr bool operator>(CSSPixels left, T right) { return left.to_double() > right; }
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inline bool operator<(CSSPixels left, int right) { return left < CSSPixels(right); }
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inline bool operator<(CSSPixels left, float right) { return left.to_float() < right; }
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inline bool operator<(CSSPixels left, double right) { return left.to_double() < right; }
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template<Arithmetic T>
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constexpr bool operator<(CSSPixels left, T right) { return left.to_double() < right; }
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inline CSSPixels operator*(CSSPixels left, int right) { return left * CSSPixels(right); }
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inline CSSPixels operator*(CSSPixels left, unsigned long right) { return left * CSSPixels(right); }
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inline float operator*(CSSPixels left, float right) { return left.to_float() * right; }
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inline double operator*(CSSPixels left, double right) { return left.to_double() * right; }
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template<Arithmetic T>
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constexpr bool operator>=(CSSPixels left, T right) { return left.to_double() >= right; }
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inline CSSPixels operator*(int left, CSSPixels right) { return right * CSSPixels(left); }
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inline CSSPixels operator*(unsigned long left, CSSPixels right) { return right * CSSPixels(left); }
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inline float operator*(float left, CSSPixels right) { return right.to_float() * left; }
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inline double operator*(double left, CSSPixels right) { return right.to_double() * left; }
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template<Arithmetic T>
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constexpr bool operator<=(CSSPixels left, T right) { return left.to_double() <= right; }
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template<Arithmetic T>
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constexpr CSSPixels operator*(CSSPixels left, T right) { return left.to_double() * right; }
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template<Arithmetic T>
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constexpr CSSPixels operator*(T left, CSSPixels right) { return right * left; }
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template<Arithmetic T>
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constexpr CSSPixels operator/(CSSPixels left, T right) { return left.to_double() / right; }
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template<Arithmetic T>
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constexpr CSSPixels operator%(CSSPixels left, T right) { return left.to_double() % right; }
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inline CSSPixels operator/(CSSPixels left, int right) { return left / CSSPixels(right); }
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inline CSSPixels operator/(CSSPixels left, unsigned long right) { return left / CSSPixels(right); }
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inline float operator/(CSSPixels left, float right) { return left.to_float() / right; }
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inline double operator/(CSSPixels left, double right) { return left.to_double() / right; }
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using CSSPixelLine = Gfx::Line<CSSPixels>;
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using CSSPixelPoint = Gfx::Point<CSSPixels>;
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@ -211,29 +137,27 @@ using DevicePixelSize = Gfx::Size<DevicePixels>;
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}
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inline Web::CSSPixels abs(Web::CSSPixels const& value)
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{
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return value.abs();
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}
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constexpr Web::CSSPixels floor(Web::CSSPixels const& value)
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{
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return ::floorf(value.to_float());
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// FIXME: Actually floor value
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return value;
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}
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constexpr Web::CSSPixels ceil(Web::CSSPixels const& value)
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{
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return ::ceilf(value.to_float());
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// FIXME: Actually ceil value
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return value;
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}
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constexpr Web::CSSPixels round(Web::CSSPixels const& value)
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{
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return ::roundf(value.to_float());
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}
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constexpr Web::CSSPixels fmod(Web::CSSPixels const& x, Web::CSSPixels const& y)
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{
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return ::fmodf(x.to_float(), y.to_float());
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}
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constexpr Web::CSSPixels abs(Web::CSSPixels const& value)
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{
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return AK::abs(value.to_float());
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// FIXME: Actually round value
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return value;
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}
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constexpr Web::DevicePixels abs(Web::DevicePixels const& value)
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