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/*
* 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
namespace android {
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 TR29 extended
// grapheme break, but with some tweaks to more closely match
// existing implementations.
static bool isGraphemeBreak(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 uint16_t* buf, size_t start, size_t count,
size_t offset, MoveOpt opt);
};
} // namespace android
#endif // MINIKIN_GRAPHEME_BREAK_H
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