The Tor Browser / file comparison
comparison: gfx/2d/BasePoint.h
gfx/2d/BasePoint.h
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:1e2a31d6f2ee |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef MOZILLA_GFX_BASEPOINT_H_ | |
| 7 #define MOZILLA_GFX_BASEPOINT_H_ | |
| 8 | |
| 9 #include <cmath> | |
| 10 #include "mozilla/Attributes.h" | |
| 11 | |
| 12 namespace mozilla { | |
| 13 namespace gfx { | |
| 14 | |
| 15 /** | |
| 16 * Do not use this class directly. Subclass it, pass that subclass as the | |
| 17 * Sub parameter, and only use that subclass. This allows methods to safely | |
| 18 * cast 'this' to 'Sub*'. | |
| 19 */ | |
| 20 template <class T, class Sub> | |
| 21 struct BasePoint { | |
| 22 T x, y; | |
| 23 | |
| 24 // Constructors | |
| 25 MOZ_CONSTEXPR BasePoint() : x(0), y(0) {} | |
| 26 MOZ_CONSTEXPR BasePoint(T aX, T aY) : x(aX), y(aY) {} | |
| 27 | |
| 28 void MoveTo(T aX, T aY) { x = aX; y = aY; } | |
| 29 void MoveBy(T aDx, T aDy) { x += aDx; y += aDy; } | |
| 30 | |
| 31 // Note that '=' isn't defined so we'll get the | |
| 32 // compiler generated default assignment operator | |
| 33 | |
| 34 bool operator==(const Sub& aPoint) const { | |
| 35 return x == aPoint.x && y == aPoint.y; | |
| 36 } | |
| 37 bool operator!=(const Sub& aPoint) const { | |
| 38 return x != aPoint.x || y != aPoint.y; | |
| 39 } | |
| 40 | |
| 41 Sub operator+(const Sub& aPoint) const { | |
| 42 return Sub(x + aPoint.x, y + aPoint.y); | |
| 43 } | |
| 44 Sub operator-(const Sub& aPoint) const { | |
| 45 return Sub(x - aPoint.x, y - aPoint.y); | |
| 46 } | |
| 47 Sub& operator+=(const Sub& aPoint) { | |
| 48 x += aPoint.x; | |
| 49 y += aPoint.y; | |
| 50 return *static_cast<Sub*>(this); | |
| 51 } | |
| 52 Sub& operator-=(const Sub& aPoint) { | |
| 53 x -= aPoint.x; | |
| 54 y -= aPoint.y; | |
| 55 return *static_cast<Sub*>(this); | |
| 56 } | |
| 57 | |
| 58 Sub operator*(T aScale) const { | |
| 59 return Sub(x * aScale, y * aScale); | |
| 60 } | |
| 61 Sub operator/(T aScale) const { | |
| 62 return Sub(x / aScale, y / aScale); | |
| 63 } | |
| 64 | |
| 65 Sub operator-() const { | |
| 66 return Sub(-x, -y); | |
| 67 } | |
| 68 | |
| 69 // Round() is *not* rounding to nearest integer if the values are negative. | |
| 70 // They are always rounding as floor(n + 0.5). | |
| 71 // See https://bugzilla.mozilla.org/show_bug.cgi?id=410748#c14 | |
| 72 Sub& Round() { | |
| 73 x = static_cast<T>(floor(x + 0.5)); | |
| 74 y = static_cast<T>(floor(y + 0.5)); | |
| 75 return *static_cast<Sub*>(this); | |
| 76 } | |
| 77 | |
| 78 }; | |
| 79 | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 #endif /* MOZILLA_GFX_BASEPOINT_H_ */ |
