OpenTTD Source  20241121-master-g67a0fccfad
string_uniscribe.h
Go to the documentation of this file.
1 /*
2  * This file is part of OpenTTD.
3  * 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.
4  * 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.
5  * 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/>.
6  */
7 
10 #ifndef STRING_UNISCRIBE_H
11 #define STRING_UNISCRIBE_H
12 
13 #include "../../gfx_layout.h"
14 #include "../../string_base.h"
15 
16 
17 void UniscribeResetScriptCache(FontSize size);
18 
19 
24 public:
26  typedef wchar_t CharType;
28  static const bool SUPPORTS_RTL = true;
29 
37  static ParagraphLayouter *GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping);
38 
46  static size_t AppendToBuffer(CharType *buff, const CharType *buffer_last, char32_t c)
47  {
48  assert(buff < buffer_last);
49  if (c >= 0x010000U) {
50  /* Character is encoded using surrogates in UTF-16. */
51  if (buff + 1 <= buffer_last) {
52  buff[0] = (CharType)(((c - 0x010000U) >> 10) + 0xD800);
53  buff[1] = (CharType)(((c - 0x010000U) & 0x3FF) + 0xDC00);
54  } else {
55  /* Not enough space in buffer. */
56  *buff = 0;
57  }
58  return 2;
59  } else {
60  *buff = (CharType)(c & 0xFFFF);
61  return 1;
62  }
63  }
64 };
65 
69  struct CharInfo {
70  bool word_stop : 1;
71  bool char_stop : 1;
72  };
73 
74  std::vector<CharInfo> str_info;
75  std::vector<size_t> utf16_to_utf8;
76 
77  size_t cur_pos;
78 
79 public:
80  void SetString(const char *s) override;
81  size_t SetCurPosition(size_t pos) override;
82  size_t Next(IterType what) override;
83  size_t Prev(IterType what) override;
84 };
85 
86 #endif /* STRING_UNISCRIBE_H */
Interface to glue fallback and normal layouter into one.
Definition: gfx_layout.h:89
Class for iterating over different kind of parts of a string.
Definition: string_base.h:14
IterType
Type of the iterator.
Definition: string_base.h:17
Helper class to construct a new UniscribeParagraphLayout.
static ParagraphLayouter * GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping)
Get the actual ParagraphLayout for the given buffer.
static const bool SUPPORTS_RTL
Helper for GetLayouter, to get whether the layouter supports RTL.
static size_t AppendToBuffer(CharType *buff, const CharType *buffer_last, char32_t c)
Append a wide character to the internal buffer.
wchar_t CharType
Helper for GetLayouter, to get the right type.
String iterator using Uniscribe as a backend.
size_t Prev(IterType what) override
Move the cursor back by one iteration unit.
std::vector< CharInfo > str_info
Break information for each code point.
size_t cur_pos
Current iteration position.
void SetString(const char *s) override
Set a new iteration string.
std::vector< size_t > utf16_to_utf8
Mapping from UTF-16 code point position to index in the UTF-8 source string.
size_t Next(IterType what) override
Advance the cursor by one iteration unit.
size_t SetCurPosition(size_t pos) override
Change the current string cursor.
std::map< int, Font * > FontMap
Mapping from index to font.
Definition: gfx_layout.h:84
FontSize
Available font sizes.
Definition: gfx_type.h:208
bool char_stop
Code point is the start of a grapheme cluster, i.e. a "character".
bool word_stop
Code point is suitable as a word break.