/* -*- 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_BASESIZE_H_
#define MOZILLA_GFX_BASESIZE_H_
#include <algorithm>
#include <ostream>
#include "mozilla/Attributes.h"
namespace mozilla::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,
class Coord = T>
struct BaseSize {
union {
struct {
T width, height;
};
T components[2];
};
// Constructors
constexpr BaseSize() : width(0), height(0) {}
constexpr BaseSize(Coord aWidth, Coord aHeight)
: width(aWidth), height(aHeight) {}
void SizeTo(T aWidth, T aHeight) {
width = aWidth;
height = aHeight;
}
bool IsEmpty()
const {
return width <= 0 || height <= 0; }
bool IsSquare()
const {
return width == height; }
MOZ_ALWAYS_INLINE T Width()
const {
return width; }
MOZ_ALWAYS_INLINE T Height()
const {
return height; }
// Note that '=' isn't defined so we'll get the
// compiler generated default assignment operator
bool operator==(
const Sub& aSize)
const {
return width == aSize.width && height == aSize.height;
}
bool operator!=(
const Sub& aSize)
const {
return width != aSize.width || height != aSize.height;
}
bool operator<=(
const Sub& aSize)
const {
return width <= aSize.width && height <= aSize.height;
}
bool operator<(
const Sub& aSize)
const {
return *
this <= aSize && *
this != aSize;
}
Sub
operator+(
const Sub& aSize)
const {
return Sub(width + aSize.width, height + aSize.height);
}
Sub operator-(
const Sub& aSize)
const {
return Sub(width - aSize.width, height - aSize.height);
}
Sub&
operator+=(
const Sub& aSize) {
width += aSize.width;
height += aSize.height;
return *
static_cast<Sub*>(
this);
}
Sub& operator-=(
const Sub& aSize) {
width -= aSize.width;
height -= aSize.height;
return *
static_cast<Sub*>(
this);
}
Sub
operator*(T aScale)
const {
return Sub(width * aScale, height * aScale); }
Sub
operator/(T aScale)
const {
return Sub(width / aScale, height / aScale); }
friend Sub
operator*(T aScale,
const Sub& aSize) {
return Sub(aScale * aSize.width, aScale * aSize.height);
}
void Scale(T aXScale, T aYScale) {
width *= aXScale;
height *= aYScale;
}
Sub
operator*(
const Sub& aSize)
const {
return Sub(width * aSize.width, height * aSize.height);
}
Sub
operator/(
const Sub& aSize)
const {
return Sub(width / aSize.width, height / aSize.height);
}
friend Sub Min(
const Sub& aA,
const Sub& aB) {
return Sub(std::min(aA.width, aB.width), std::min(aA.height, aB.height));
}
friend Sub Max(
const Sub& aA,
const Sub& aB) {
return Sub(std::max(aA.width, aB.width), std::max(aA.height, aB.height));
}
friend std::ostream&
operator<<(std::ostream& aStream,
const BaseSize<T, Sub, Coord>& aSize) {
return aStream <<
'(' << aSize.width <<
" x " << aSize.height <<
')';
}
};
}
// namespace mozilla::gfx
#endif /* MOZILLA_GFX_BASESIZE_H_ */
