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+/* -*- 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>
+struct BaseSize {
+ union {
+ struct {
+ T width, height;
+ };
+ T components[2];
+ };
+
+ // Constructors
+ constexpr BaseSize() : width(0), height(0) {}
+ constexpr BaseSize(T aWidth, T 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>& aSize) {
+ return aStream << '(' << aSize.width << " x " << aSize.height << ')';
+ }
+};
+
+} // namespace mozilla::gfx
+
+#endif /* MOZILLA_GFX_BASESIZE_H_ */