| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef MINIKIN_GRAPHEME_BREAK_H |
| #define MINIKIN_GRAPHEME_BREAK_H |
| |
| #include <cstddef> |
| #include <cstdint> |
| |
| namespace minikin { |
| |
| class GraphemeBreak { |
| public: |
| // These values must be kept in sync with CURSOR_AFTER etc in Paint.java |
| enum MoveOpt { AFTER = 0, AT_OR_AFTER = 1, BEFORE = 2, AT_OR_BEFORE = 3, AT = 4 }; |
| |
| // Determine whether the given offset is a grapheme break. |
| // This implementation generally follows Unicode's UTR #29 extended |
| // grapheme break, with various tweaks. |
| static bool isGraphemeBreak(const float* advances, const uint16_t* buf, size_t start, |
| size_t count, size_t offset); |
| |
| // Matches Android's Java API. Note, return (size_t)-1 for AT to |
| // signal non-break because unsigned return type. |
| static size_t getTextRunCursor(const float* advances, const uint16_t* buf, size_t start, |
| size_t count, size_t offset, MoveOpt opt); |
| }; |
| |
| } // namespace minikin |
| |
| #endif // MINIKIN_GRAPHEME_BREAK_H |