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