101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_GFX_BASESIZE_H_
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#define MOZILLA_GFX_BASESIZE_H_
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#include "mozilla/Attributes.h"
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namespace mozilla {
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namespace gfx {
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/**
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* Do not use this class directly. Subclass it, pass that subclass as the
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* Sub parameter, and only use that subclass. This allows methods to safely
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* cast 'this' to 'Sub*'.
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*/
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template <class T, class Sub>
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struct BaseSize {
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union {
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struct {
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T width, height;
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};
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T components[2];
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};
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// Constructors
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constexpr BaseSize() : width(0), height(0) {}
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constexpr BaseSize(T aWidth, T aHeight) : width(aWidth), height(aHeight) {}
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void SizeTo(T aWidth, T aHeight) { width = aWidth; height = aHeight; }
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bool IsEmpty() const {
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return width <= 0 || height <= 0;
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}
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bool IsSquare() const {
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return width == height;
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}
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// Note that '=' isn't defined so we'll get the
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// compiler generated default assignment operator
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bool operator==(const Sub& aSize) const {
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return width == aSize.width && height == aSize.height;
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}
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bool operator!=(const Sub& aSize) const {
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return width != aSize.width || height != aSize.height;
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}
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bool operator<=(const Sub& aSize) const {
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return width <= aSize.width && height <= aSize.height;
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}
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bool operator<(const Sub& aSize) const {
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return *this <= aSize && *this != aSize;
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}
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Sub operator+(const Sub& aSize) const {
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return Sub(width + aSize.width, height + aSize.height);
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}
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Sub operator-(const Sub& aSize) const {
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return Sub(width - aSize.width, height - aSize.height);
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}
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Sub& operator+=(const Sub& aSize) {
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width += aSize.width;
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height += aSize.height;
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return *static_cast<Sub*>(this);
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}
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Sub& operator-=(const Sub& aSize) {
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width -= aSize.width;
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height -= aSize.height;
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return *static_cast<Sub*>(this);
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}
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Sub operator*(T aScale) const {
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return Sub(width * aScale, height * aScale);
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}
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Sub operator/(T aScale) const {
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return Sub(width / aScale, height / aScale);
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}
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friend Sub operator*(T aScale, const Sub& aSize) {
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return Sub(aScale * aSize.width, aScale * aSize.height);
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}
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void Scale(T aXScale, T aYScale) {
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width *= aXScale;
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height *= aYScale;
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}
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Sub operator*(const Sub& aSize) const {
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return Sub(width * aSize.width, height * aSize.height);
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}
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Sub operator/(const Sub& aSize) const {
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return Sub(width / aSize.width, height / aSize.height);
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}
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};
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} // namespace gfx
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} // namespace mozilla
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#endif /* MOZILLA_GFX_BASESIZE_H_ */
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