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 #include <cstdint> 21 22 namespace minikin { 23 24 class GraphemeBreak { 25 public: 26 // These values must be kept in sync with CURSOR_AFTER etc in Paint.java 27 enum MoveOpt { AFTER = 0, AT_OR_AFTER = 1, BEFORE = 2, AT_OR_BEFORE = 3, AT = 4 }; 28 29 // Determine whether the given offset is a grapheme break. 30 // This implementation generally follows Unicode's UTR #29 extended 31 // grapheme break, with various tweaks. 32 static bool isGraphemeBreak(const float* advances, const uint16_t* buf, size_t start, 33 size_t count, size_t offset); 34 35 // Matches Android's Java API. Note, return (size_t)-1 for AT to 36 // signal non-break because unsigned return type. 37 static size_t getTextRunCursor(const float* advances, const uint16_t* buf, size_t start, 38 size_t count, size_t offset, MoveOpt opt); 39 }; 40 41 } // namespace minikin 42 43 #endif // MINIKIN_GRAPHEME_BREAK_H 44
