1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 : * ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is Mozilla Corporation code.
16 : *
17 : * The Initial Developer of the Original Code is Mozilla Foundation.
18 : * Portions created by the Initial Developer are Copyright (C) 2011
19 : * the Initial Developer. All Rights Reserved.
20 : *
21 : * Contributor(s):
22 : * Robert O'Callahan <robert@ocallahan.org>
23 : *
24 : * Alternatively, the contents of this file may be used under the terms of
25 : * either the GNU General Public License Version 2 or later (the "GPL"), or
26 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 : * in which case the provisions of the GPL or the LGPL are applicable instead
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33 : * the provisions above, a recipient may use your version of this file under
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35 : *
36 : * ***** END LICENSE BLOCK ***** */
37 :
38 : #ifndef MOZILLA_GFX_BASESIZE_H_
39 : #define MOZILLA_GFX_BASESIZE_H_
40 :
41 : namespace mozilla {
42 : namespace gfx {
43 :
44 : /**
45 : * Do not use this class directly. Subclass it, pass that subclass as the
46 : * Sub parameter, and only use that subclass. This allows methods to safely
47 : * cast 'this' to 'Sub*'.
48 : */
49 : template <class T, class Sub>
50 : struct BaseSize {
51 : T width, height;
52 :
53 : // Constructors
54 0 : BaseSize() : width(0), height(0) {}
55 0 : BaseSize(T aWidth, T aHeight) : width(aWidth), height(aHeight) {}
56 :
57 : void SizeTo(T aWidth, T aHeight) { width = aWidth; height = aHeight; }
58 :
59 : // Note that '=' isn't defined so we'll get the
60 : // compiler generated default assignment operator
61 :
62 : bool operator==(const Sub& aSize) const {
63 : return width == aSize.width && height == aSize.height;
64 : }
65 : bool operator!=(const Sub& aSize) const {
66 : return width != aSize.width || height != aSize.height;
67 : }
68 : bool operator<=(const Sub& aSize) const {
69 : return width <= aSize.width && height <= aSize.height;
70 : }
71 : bool operator<(const Sub& aSize) const {
72 : return *this <= aSize && *this != aSize;
73 : }
74 :
75 : Sub operator+(const Sub& aSize) const {
76 : return Sub(width + aSize.width, height + aSize.height);
77 : }
78 : Sub operator-(const Sub& aSize) const {
79 : return Sub(width - aSize.width, height - aSize.height);
80 : }
81 : Sub& operator+=(const Sub& aSize) {
82 : width += aSize.width;
83 : height += aSize.height;
84 : return *static_cast<Sub*>(this);
85 : }
86 : Sub& operator-=(const Sub& aSize) {
87 : width -= aSize.width;
88 : height -= aSize.height;
89 : return *static_cast<Sub*>(this);
90 : }
91 :
92 : Sub operator*(T aScale) const {
93 : return Sub(width * aScale, height * aScale);
94 : }
95 : Sub operator/(T aScale) const {
96 : return Sub(width / aScale, height / aScale);
97 : }
98 : };
99 :
100 : }
101 : }
102 :
103 : #endif /* MOZILLA_GFX_BASESIZE_H_ */
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