Flutter Engine
LayoutUtils.h
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1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef MINIKIN_LAYOUT_UTILS_H
18 #define MINIKIN_LAYOUT_UTILS_H
19 
20 #include <stddef.h>
21 #include <stdint.h>
22 
23 namespace minikin {
24 
25 /*
26  * Determine whether the code unit is a word space for the purposes of
27  * justification.
28  */
29 bool isWordSpace(uint16_t code_unit);
30 
31 /**
32  * Return offset of previous word break. It is either < offset or == 0.
33  *
34  * For the purpose of layout, a word break is a boundary with no
35  * kerning or complex script processing. This is necessarily a
36  * heuristic, but should be accurate most of the time.
37  */
38 size_t getPrevWordBreakForCache(const uint16_t* chars,
39  size_t offset,
40  size_t len);
41 
42 /**
43  * Return offset of next word break. It is either > offset or == len.
44  *
45  * For the purpose of layout, a word break is a boundary with no
46  * kerning or complex script processing. This is necessarily a
47  * heuristic, but should be accurate most of the time.
48  */
49 size_t getNextWordBreakForCache(const uint16_t* chars,
50  size_t offset,
51  size_t len);
52 
53 } // namespace minikin
54 #endif // MINIKIN_LAYOUT_UTILS_H
bool isWordSpace(uint16_t code_unit)
size_t getPrevWordBreakForCache(const uint16_t *chars, size_t offset, size_t len)
size_t getNextWordBreakForCache(const uint16_t *chars, size_t offset, size_t len)