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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CompositorElementId_h | 5 #ifndef CompositorElementId_h |
6 #define CompositorElementId_h | 6 #define CompositorElementId_h |
7 | 7 |
8 #include "cc/trees/element_id.h" | 8 #include "cc/trees/element_id.h" |
9 #include "platform/PlatformExport.h" | 9 #include "platform/PlatformExport.h" |
10 #include "platform/wtf/HashFunctions.h" | 10 #include "platform/wtf/HashFunctions.h" |
11 #include "platform/wtf/HashSet.h" | 11 #include "platform/wtf/HashSet.h" |
12 #include "platform/wtf/HashTraits.h" | 12 #include "platform/wtf/HashTraits.h" |
13 | 13 |
14 namespace blink { | 14 namespace blink { |
15 | 15 |
16 // Do not add more of these without adjusting the bitfield arithmetic in | |
suzyh_UTC10 (ex-contributor)
2017/05/05 04:27:31
(If we don't remove this enum class) Can we enforc
| |
17 // CreateCompositorElementId. | |
16 enum class CompositorSubElementId { | 18 enum class CompositorSubElementId { |
pdr.
2017/05/05 03:46:10
Do you know what this is really needed for? I thin
chrishtr
2017/05/05 05:34:52
Thought about this some. Perhaps the reason for th
ajuma
2017/05/05 13:46:42
Yeah, my recollection is that these were added bec
| |
17 kPrimary, | 19 kPrimary = 0, |
18 kScroll, | 20 kScroll = 1, |
19 kViewport, | 21 kViewport = 2, |
20 kLinkHighlight | 22 kLinkHighlight = 3 |
21 }; | 23 }; |
22 | 24 |
23 using CompositorElementId = cc::ElementId; | 25 using CompositorElementId = cc::ElementId; |
26 static const int kInvalidElementId = 0; | |
suzyh_UTC10 (ex-contributor)
2017/05/05 04:27:31
Why is this redeclared instead of using the Elemen
chrishtr
2017/05/05 05:34:52
Fixed.
| |
24 | 27 |
25 CompositorElementId PLATFORM_EXPORT | 28 CompositorElementId PLATFORM_EXPORT |
26 CreateCompositorElementId(int dom_node_id, CompositorSubElementId); | 29 CreateCompositorElementId(int dom_node_id, CompositorSubElementId); |
27 | 30 |
28 // Note cc::ElementId has a hash function already implemented via | 31 int PLATFORM_EXPORT DomNodeIdFromCompositorElementId(CompositorElementId); |
29 // ElementIdHash::operator(). However for consistency's sake we choose to use | |
30 // Blink's hash functions with Blink specific data structures. | |
31 struct CompositorElementIdHash { | |
32 static unsigned GetHash(const CompositorElementId& p) { | |
33 return WTF::HashInts(p.primaryId, p.secondaryId); | |
34 } | |
35 static bool Equal(const CompositorElementId& a, | |
36 const CompositorElementId& b) { | |
37 return a.primaryId == b.primaryId && a.secondaryId == b.secondaryId; | |
38 } | |
39 static const bool safe_to_compare_to_empty_or_deleted = true; | |
40 }; | |
41 | 32 |
42 struct CompositorElementIdHashTraits | 33 using CompositorElementIdSet = HashSet<CompositorElementId>; |
43 : WTF::GenericHashTraits<CompositorElementId> { | |
44 static CompositorElementId EmptyValue() { return CompositorElementId(); } | |
45 static void ConstructDeletedValue(CompositorElementId& slot, bool) { | |
46 slot = CompositorElementId(-1, -1); | |
47 } | |
48 static bool IsDeletedValue(CompositorElementId value) { | |
49 return value == CompositorElementId(-1, -1); | |
50 } | |
51 }; | |
52 | |
53 using CompositorElementIdSet = HashSet<CompositorElementId, | |
54 CompositorElementIdHash, | |
55 CompositorElementIdHashTraits>; | |
56 | 34 |
57 } // namespace blink | 35 } // namespace blink |
58 | 36 |
59 #endif // CompositorElementId_h | 37 #endif // CompositorElementId_h |
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