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 <stdint.h> 21 22 namespace minikin { 23 24 /* 25 * Determine whether the code unit is a word space for the purposes of justification. 26 */ 27 bool isWordSpace(uint16_t code_unit); 28 29 /** 30 * Return offset of previous word break. It is either < offset or == 0. 31 * 32 * For the purpose of layout, a word break is a boundary with no 33 * kerning or complex script processing. This is necessarily a 34 * heuristic, but should be accurate most of the time. 35 */ 36 size_t getPrevWordBreakForCache( 37 const uint16_t* chars, size_t offset, size_t len); 38 39 /** 40 * Return offset of next word break. It is either > offset or == len. 41 * 42 * For the purpose of layout, a word break is a boundary with no 43 * kerning or complex script processing. This is necessarily a 44 * heuristic, but should be accurate most of the time. 45 */ 46 size_t getNextWordBreakForCache( 47 const uint16_t* chars, size_t offset, size_t len); 48 49 } // namespace minikin 50 #endif // MINIKIN_LAYOUT_UTILS_H 51