1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/2d/BaseSize.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,88 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef MOZILLA_GFX_BASESIZE_H_
1.10 +#define MOZILLA_GFX_BASESIZE_H_
1.11 +
1.12 +#include "mozilla/Attributes.h"
1.13 +
1.14 +namespace mozilla {
1.15 +namespace gfx {
1.16 +
1.17 +/**
1.18 + * Do not use this class directly. Subclass it, pass that subclass as the
1.19 + * Sub parameter, and only use that subclass. This allows methods to safely
1.20 + * cast 'this' to 'Sub*'.
1.21 + */
1.22 +template <class T, class Sub>
1.23 +struct BaseSize {
1.24 + T width, height;
1.25 +
1.26 + // Constructors
1.27 + MOZ_CONSTEXPR BaseSize() : width(0), height(0) {}
1.28 + MOZ_CONSTEXPR BaseSize(T aWidth, T aHeight) : width(aWidth), height(aHeight) {}
1.29 +
1.30 + void SizeTo(T aWidth, T aHeight) { width = aWidth; height = aHeight; }
1.31 +
1.32 + bool IsEmpty() const {
1.33 + return width == 0 || height == 0;
1.34 + }
1.35 +
1.36 + // Note that '=' isn't defined so we'll get the
1.37 + // compiler generated default assignment operator
1.38 +
1.39 + bool operator==(const Sub& aSize) const {
1.40 + return width == aSize.width && height == aSize.height;
1.41 + }
1.42 + bool operator!=(const Sub& aSize) const {
1.43 + return width != aSize.width || height != aSize.height;
1.44 + }
1.45 + bool operator<=(const Sub& aSize) const {
1.46 + return width <= aSize.width && height <= aSize.height;
1.47 + }
1.48 + bool operator<(const Sub& aSize) const {
1.49 + return *this <= aSize && *this != aSize;
1.50 + }
1.51 +
1.52 + Sub operator+(const Sub& aSize) const {
1.53 + return Sub(width + aSize.width, height + aSize.height);
1.54 + }
1.55 + Sub operator-(const Sub& aSize) const {
1.56 + return Sub(width - aSize.width, height - aSize.height);
1.57 + }
1.58 + Sub& operator+=(const Sub& aSize) {
1.59 + width += aSize.width;
1.60 + height += aSize.height;
1.61 + return *static_cast<Sub*>(this);
1.62 + }
1.63 + Sub& operator-=(const Sub& aSize) {
1.64 + width -= aSize.width;
1.65 + height -= aSize.height;
1.66 + return *static_cast<Sub*>(this);
1.67 + }
1.68 +
1.69 + Sub operator*(T aScale) const {
1.70 + return Sub(width * aScale, height * aScale);
1.71 + }
1.72 + Sub operator/(T aScale) const {
1.73 + return Sub(width / aScale, height / aScale);
1.74 + }
1.75 + void Scale(T aXScale, T aYScale) {
1.76 + width *= aXScale;
1.77 + height *= aYScale;
1.78 + }
1.79 +
1.80 + Sub operator*(const Sub& aSize) const {
1.81 + return Sub(width * aSize.width, height * aSize.height);
1.82 + }
1.83 + Sub operator/(const Sub& aSize) const {
1.84 + return Sub(width / aSize.width, height / aSize.height);
1.85 + }
1.86 +};
1.87 +
1.88 +}
1.89 +}
1.90 +
1.91 +#endif /* MOZILLA_GFX_BASESIZE_H_ */
