1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4  * License, v. 2.0. If a copy of the MPL was not distributed with this
5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 
7 #ifndef mozilla_BorderCache_h_
8 #define mozilla_BorderCache_h_
9 
10 #include "mozilla/gfx/2D.h"
11 #include "mozilla/HashFunctions.h"
12 #include "PLDHashTable.h"
13 
14 namespace mozilla {
15 // Cache for best overlap and best dashLength.
16 
17 struct FourFloats {
18   typedef mozilla::gfx::Float Float;
19 
20   Float n[4];
21 
FourFloatsFourFloats22   FourFloats() {
23     n[0] = 0.0f;
24     n[1] = 0.0f;
25     n[2] = 0.0f;
26     n[3] = 0.0f;
27   }
28 
FourFloatsFourFloats29   FourFloats(Float a, Float b, Float c, Float d) {
30     n[0] = a;
31     n[1] = b;
32     n[2] = c;
33     n[3] = d;
34   }
35 
36   bool operator==(const FourFloats& aOther) const {
37     return n[0] == aOther.n[0] && n[1] == aOther.n[1] && n[2] == aOther.n[2] &&
38            n[3] == aOther.n[3];
39   }
40 };
41 
42 class FourFloatsHashKey : public PLDHashEntryHdr {
43  public:
44   typedef const FourFloats& KeyType;
45   typedef const FourFloats* KeyTypePointer;
46 
FourFloatsHashKey(KeyTypePointer aKey)47   explicit FourFloatsHashKey(KeyTypePointer aKey) : mValue(*aKey) {}
FourFloatsHashKey(const FourFloatsHashKey & aToCopy)48   FourFloatsHashKey(const FourFloatsHashKey& aToCopy)
49       : mValue(aToCopy.mValue) {}
50   ~FourFloatsHashKey() = default;
51 
GetKey()52   KeyType GetKey() const { return mValue; }
KeyEquals(KeyTypePointer aKey)53   bool KeyEquals(KeyTypePointer aKey) const { return *aKey == mValue; }
54 
KeyToPointer(KeyType aKey)55   static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
HashKey(KeyTypePointer aKey)56   static PLDHashNumber HashKey(KeyTypePointer aKey) {
57     return HashBytes(aKey->n, sizeof(mozilla::gfx::Float) * 4);
58   }
59   enum { ALLOW_MEMMOVE = true };
60 
61  private:
62   const FourFloats mValue;
63 };
64 
65 }  // namespace mozilla
66 
67 #endif /* mozilla_BorderCache_h_ */
68