gfx/2d/BaseSize.h@97036ab72558
gfx/2d/BaseSize.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
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/. */
6 #ifndef MOZILLA_GFX_BASESIZE_H_
7 #define MOZILLA_GFX_BASESIZE_H_
9 #include "mozilla/Attributes.h"
11 namespace mozilla {
12 namespace gfx {
14 /**
15 * Do not use this class directly. Subclass it, pass that subclass as the
16 * Sub parameter, and only use that subclass. This allows methods to safely
17 * cast 'this' to 'Sub*'.
18 */
19 template <class T, class Sub>
20 struct BaseSize {
21 T width, height;
23 // Constructors
24 MOZ_CONSTEXPR BaseSize() : width(0), height(0) {}
25 MOZ_CONSTEXPR BaseSize(T aWidth, T aHeight) : width(aWidth), height(aHeight) {}
27 void SizeTo(T aWidth, T aHeight) { width = aWidth; height = aHeight; }
29 bool IsEmpty() const {
30 return width == 0 || height == 0;
31 }
33 // Note that '=' isn't defined so we'll get the
34 // compiler generated default assignment operator
36 bool operator==(const Sub& aSize) const {
37 return width == aSize.width && height == aSize.height;
38 }
39 bool operator!=(const Sub& aSize) const {
40 return width != aSize.width || height != aSize.height;
41 }
42 bool operator<=(const Sub& aSize) const {
43 return width <= aSize.width && height <= aSize.height;
44 }
45 bool operator<(const Sub& aSize) const {
46 return *this <= aSize && *this != aSize;
47 }
49 Sub operator+(const Sub& aSize) const {
50 return Sub(width + aSize.width, height + aSize.height);
51 }
52 Sub operator-(const Sub& aSize) const {
53 return Sub(width - aSize.width, height - aSize.height);
54 }
55 Sub& operator+=(const Sub& aSize) {
56 width += aSize.width;
57 height += aSize.height;
58 return *static_cast<Sub*>(this);
59 }
60 Sub& operator-=(const Sub& aSize) {
61 width -= aSize.width;
62 height -= aSize.height;
63 return *static_cast<Sub*>(this);
64 }
66 Sub operator*(T aScale) const {
67 return Sub(width * aScale, height * aScale);
68 }
69 Sub operator/(T aScale) const {
70 return Sub(width / aScale, height / aScale);
71 }
72 void Scale(T aXScale, T aYScale) {
73 width *= aXScale;
74 height *= aYScale;
75 }
77 Sub operator*(const Sub& aSize) const {
78 return Sub(width * aSize.width, height * aSize.height);
79 }
80 Sub operator/(const Sub& aSize) const {
81 return Sub(width / aSize.width, height / aSize.height);
82 }
83 };
85 }
86 }
88 #endif /* MOZILLA_GFX_BASESIZE_H_ */
