string_uniscribe.h

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef STRING_UNISCRIBE_H
#define STRING_UNISCRIBE_H
 
#include "../../gfx_layout.h"
#include "../../string_base.h"
 
 
void UniscribeResetScriptCache(FontSize size);
 
 
class UniscribeParagraphLayoutFactory {
public:
  typedef wchar_t CharType;
  static const bool SUPPORTS_RTL = true;
 
  static std::unique_ptr<ParagraphLayouter> GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &font_mapping);
 
  static size_t AppendToBuffer(CharType *buff, const CharType *buffer_last, char32_t c)
  {
    assert(buff < buffer_last);
    if (c >= 0x010000U) {
      /* Character is encoded using surrogates in UTF-16. */
      if (buff + 1 <= buffer_last) {
        buff[0] = (CharType)(((c - 0x010000U) >> 10) + 0xD800);
        buff[1] = (CharType)(((c - 0x010000U) & 0x3FF) + 0xDC00);
      } else {
        /* Not enough space in buffer. */
        *buff = 0;
      }
      return 2;
    } else {
      *buff = (CharType)(c & 0xFFFF);
      return 1;
    }
  }
};
 
class UniscribeStringIterator : public StringIterator {
  struct CharInfo {
    bool word_stop : 1; 
    bool char_stop : 1; 
  };
 
  std::vector<CharInfo> str_info;      
  std::vector<size_t>   utf16_to_utf8; 
 
  size_t cur_pos; 
 
public:
  void SetString(const char *s) override;
  size_t SetCurPosition(size_t pos) override;
  size_t Next(IterType what) override;
  size_t Prev(IterType what) override;
};
 
#endif /* STRING_UNISCRIBE_H */