1 /* 2 * Copyright (C) 2014 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_GRAPHEME_BREAK_H 18 #define MINIKIN_GRAPHEME_BREAK_H 19 20 namespace android { 21 22 class GraphemeBreak { 23 public: 24 // These values must be kept in sync with CURSOR_AFTER etc in Paint.java 25 enum MoveOpt { 26 AFTER = 0, 27 AT_OR_AFTER = 1, 28 BEFORE = 2, 29 AT_OR_BEFORE = 3, 30 AT = 4 31 }; 32 33 // Determine whether the given offset is a grapheme break. 34 // This implementation generally follows Unicode TR29 extended 35 // grapheme break, but with some tweaks to more closely match 36 // existing implementations. 37 static bool isGraphemeBreak(const uint16_t* buf, size_t start, size_t count, size_t offset); 38 39 // Matches Android's Java API. Note, return (size_t)-1 for AT to 40 // signal non-break because unsigned return type. 41 static size_t getTextRunCursor(const uint16_t* buf, size_t start, size_t count, 42 size_t offset, MoveOpt opt); 43 }; 44 45 } // namespace android 46 47 #endif // MINIKIN_GRAPHEME_BREAK_H