diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /gfx/2d/BaseCoord.h | |
parent | Initial commit. (diff) | |
download | firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/2d/BaseCoord.h')
-rw-r--r-- | gfx/2d/BaseCoord.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/gfx/2d/BaseCoord.h b/gfx/2d/BaseCoord.h new file mode 100644 index 0000000000..288f00b1d6 --- /dev/null +++ b/gfx/2d/BaseCoord.h @@ -0,0 +1,103 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef MOZILLA_GFX_BASECOORD_H_ +#define MOZILLA_GFX_BASECOORD_H_ + +#include <ostream> + +#include "mozilla/Attributes.h" +#include "mozilla/MathAlgorithms.h" + +namespace mozilla { +namespace gfx { + +/** + * Do not use this class directly. Subclass it, pass that subclass as the + * Sub parameter, and only use that subclass. This allows methods to safely + * cast 'this' to 'Sub*'. + */ +template <class T, class Sub> +struct BaseCoord { + T value; + + // Constructors + constexpr BaseCoord() : value(0) {} + explicit constexpr BaseCoord(T aValue) : value(aValue) {} + + // Note that '=' isn't defined so we'll get the + // compiler generated default assignment operator + + friend constexpr Sub Abs(BaseCoord aCoord) { return Abs(aCoord.value); } + + constexpr operator T() const { return value; } + + friend constexpr bool operator==(Sub aA, Sub aB) { + return aA.value == aB.value; + } + friend constexpr bool operator!=(Sub aA, Sub aB) { + return aA.value != aB.value; + } + + friend constexpr Sub operator+(Sub aA, Sub aB) { + return Sub(aA.value + aB.value); + } + friend constexpr Sub operator-(Sub aA, Sub aB) { + return Sub(aA.value - aB.value); + } + friend constexpr Sub operator*(Sub aCoord, T aScale) { + return Sub(aCoord.value * aScale); + } + friend constexpr Sub operator*(T aScale, Sub aCoord) { + return Sub(aScale * aCoord.value); + } + friend constexpr Sub operator/(Sub aCoord, T aScale) { + return Sub(aCoord.value / aScale); + } + // 'scale / coord' is intentionally omitted because it doesn't make sense. + + constexpr Sub& operator+=(Sub aCoord) { + value += aCoord.value; + return *static_cast<Sub*>(this); + } + constexpr Sub& operator-=(Sub aCoord) { + value -= aCoord.value; + return *static_cast<Sub*>(this); + } + constexpr Sub& operator*=(T aScale) { + value *= aScale; + return *static_cast<Sub*>(this); + } + constexpr Sub& operator/=(T aScale) { + value /= aScale; + return *static_cast<Sub*>(this); + } + + // Since BaseCoord is implicitly convertible to its value type T, we need + // mixed-type operator overloads to avoid ambiguities at mixed-type call + // sites. As we transition more of our code to strongly-typed classes, we + // may be able to remove some or all of these overloads. + friend constexpr bool operator==(Sub aA, T aB) { return aA.value == aB; } + friend constexpr bool operator==(T aA, Sub aB) { return aA == aB.value; } + friend constexpr bool operator!=(Sub aA, T aB) { return aA.value != aB; } + friend constexpr bool operator!=(T aA, Sub aB) { return aA != aB.value; } + friend constexpr T operator+(Sub aA, T aB) { return aA.value + aB; } + friend constexpr T operator+(T aA, Sub aB) { return aA + aB.value; } + friend constexpr T operator-(Sub aA, T aB) { return aA.value - aB; } + friend constexpr T operator-(T aA, Sub aB) { return aA - aB.value; } + + constexpr Sub operator-() const { return Sub(-value); } + + friend std::ostream& operator<<(std::ostream& aStream, + const BaseCoord<T, Sub>& aCoord) { + return aStream << aCoord.value; + } +}; + +} // namespace gfx +} // namespace mozilla + +#endif /* MOZILLA_GFX_BASECOORD_H_ */ |