1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_CHARACTER_PROPERTY_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_CHARACTER_PROPERTY_H_
#include <cstdint>
namespace blink {
using CharacterPropertyType = uint16_t;
// TODO(lingqi): Some values are never used. e.g., a char that is Hangul should
// always be kIsCJKIdeographOrSymbol, os 0b1000 is never used. Attempt to
// compress the Property.
enum class CharacterProperty : CharacterPropertyType {
kIsCJKIdeographOrSymbol = 1 << 0,
kIsPotentialCustomElementNameChar = 1 << 1,
kIsBidiControl = 1 << 2,
kIsHangul = 1 << 3,
// Bits to store `HanKerningCharType`.
kHanKerningShift = 4,
kHanKerningSize = 4,
kHanKerningMask = ((1 << kHanKerningSize) - 1),
kHanKerningShiftedMask = kHanKerningMask << kHanKerningShift,
// Bits to store `EastAsianSpacingType`.
kEastAsianSpacingShift = 8,
kEastAsianSpacingSize = 2,
kEastAsianSpacingShiftedMask = ((1 << kEastAsianSpacingSize) - 1)
<< kEastAsianSpacingShift,
kNumBits = kEastAsianSpacingShift + kEastAsianSpacingSize,
};
static_assert(static_cast<unsigned>(CharacterProperty::kNumBits) <=
sizeof(CharacterPropertyType) * 8);
inline CharacterProperty operator|(CharacterProperty a, CharacterProperty b) {
return static_cast<CharacterProperty>(static_cast<CharacterPropertyType>(a) |
static_cast<CharacterPropertyType>(b));
}
inline CharacterProperty operator&(CharacterProperty a, CharacterProperty b) {
return static_cast<CharacterProperty>(static_cast<CharacterPropertyType>(a) &
static_cast<CharacterPropertyType>(b));
}
inline CharacterProperty operator|=(CharacterProperty& a, CharacterProperty b) {
a = a | b;
return a;
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_CHARACTER_PROPERTY_H_
|
