1 /*
2  * Copyright (C) 2011 Apple Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23  * THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #ifndef IntRectHash_h
27 #define IntRectHash_h
28 
29 #include "IntPointHash.h"
30 #include "IntRect.h"
31 #include "IntSizeHash.h"
32 #include <wtf/HashMap.h>
33 #include <wtf/HashSet.h>
34 
35 namespace WTF {
36 
37 template<> struct IntHash<WebCore::IntRect> {
38     static unsigned hash(const WebCore::IntRect& key)
39     {
40         return intHash(static_cast<uint64_t>(DefaultHash<WebCore::IntPoint>::Hash::hash(key.location())) << 32 | DefaultHash<WebCore::IntSize>::Hash::hash(key.size()));
41     }
42     static bool equal(const WebCore::IntRect& a, const WebCore::IntRect& b)
43     {
44         return DefaultHash<WebCore::IntPoint>::Hash::equal(a.location(), b.location()) && DefaultHash<WebCore::IntSize>::Hash::equal(a.size(), b.size());
45     }
46     static const bool safeToCompareToEmptyOrDeleted = true;
47 };
48 template<> struct DefaultHash<WebCore::IntRect> { typedef IntHash<WebCore::IntRect> Hash; };
49 
50 template<> struct HashTraits<WebCore::IntRect> : GenericHashTraits<WebCore::IntRect> {
51     static const bool emptyValueIsZero = true;
52     static const bool needsDestruction = false;
53     static void constructDeletedValue(WebCore::IntRect& slot) { new (&slot) WebCore::IntRect(-1, -1, -1, -1); }
54     static bool isDeletedValue(const WebCore::IntRect& value) { return value.x() == -1 && value.y() == -1 && value.width() == -1 && value.height() == -1; }
55 };
56 
57 }
58 
59 #endif
60