blob: 7ec7ca670863a5e7c048e83b27385c166482c953 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/*
* 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/>.
*/
/** @file string_uniscribe.h Functions related to laying out text on Win32. */
#ifndef STRING_UNISCRIBE_H
#define STRING_UNISCRIBE_H
#include "../../gfx_layout.h"
#include "../../string_base.h"
#include <vector>
void UniscribeResetScriptCache(FontSize size);
/**
* Helper class to construct a new #UniscribeParagraphLayout.
*/
class UniscribeParagraphLayoutFactory {
public:
/** Helper for GetLayouter, to get the right type. */
typedef wchar_t CharType;
/** Helper for GetLayouter, to get whether the layouter supports RTL. */
static const bool SUPPORTS_RTL = true;
/**
* Get the actual ParagraphLayout for the given buffer.
* @param buff The begin of the buffer.
* @param buff_end The location after the last element in the buffer.
* @param fontMapping THe mapping of the fonts.
* @return The ParagraphLayout instance.
*/
static ParagraphLayouter *GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping);
/**
* Append a wide character to the internal buffer.
* @param buff The buffer to append to.
* @param buffer_last The end of the buffer.
* @param c The character to add.
* @return The number of buffer spaces that were used.
*/
static size_t AppendToBuffer(CharType *buff, const CharType *buffer_last, WChar c)
{
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;
}
}
};
/** String iterator using Uniscribe as a backend. */
class UniscribeStringIterator : public StringIterator {
/** */
struct CharInfo {
bool word_stop : 1; ///< Code point is suitable as a word break.
bool char_stop : 1; ///< Code point is the start of a grapheme cluster, i.e. a "character".
};
std::vector<CharInfo> str_info; ///< Break information for each code point.
std::vector<size_t> utf16_to_utf8; ///< Mapping from UTF-16 code point position to index in the UTF-8 source string.
size_t cur_pos; ///< Current iteration position.
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 */
|
