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 <cstdint>
21 
22 #include "minikin/U16StringPiece.h"
23 
24 namespace minikin {
25 
26 /*
27  * Determine whether the code unit is a word space for the purposes of 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 uint32_t getPrevWordBreakForCache(const U16StringPiece& textBuf, uint32_t offset);
39 
40 /**
41  * Return offset of next word break. It is either > offset or == len.
42  *
43  * For the purpose of layout, a word break is a boundary with no
44  * kerning or complex script processing. This is necessarily a
45  * heuristic, but should be accurate most of the time.
46  */
47 uint32_t getNextWordBreakForCache(const U16StringPiece& textBuf, uint32_t offset);
48 
49 }  // namespace minikin
50 #endif  // MINIKIN_LAYOUT_UTILS_H
51