OpenTTD Source: src/os/unix/font_unix.cpp Source File

OpenTTD Source 12.0-beta1

font_unix.cpp
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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 #include "../../stdafx.h"
11 #include "../../debug.h"
12 #include "../../fontdetection.h"
13 #include "../../string_func.h"
14 #include "../../strings_func.h"
15
16 #include <fontconfig/fontconfig.h>
17
18 #include "safeguards.h"
19
20 #ifdef WITH_FREETYPE
21
22 #include <ft2build.h>
23 #include FT_FREETYPE_H
24
25 extern FT_Library _library;
26
27
28 FT_Error GetFontByFaceName(const char *font_name, FT_Face *face)
29 {
30 FT_Error err = FT_Err_Cannot_Open_Resource;
31
32 if (!FcInit()) {
33 ShowInfoF("Unable to load font configuration");
34 } else {
35 FcPattern *match;
36 FcPattern *pat;
37 FcFontSet *fs;
38 FcResult result;
39 char *font_style;
40 char *font_family;
41
42 /* Split & strip the font's style */
43 font_family = stredup(font_name);
44 font_style = strchr(font_family, ',');
45 if (font_style != nullptr) {
46 font_style[0] = '\0';
47 font_style++;
48 while (*font_style == ' ' || *font_style == '\t') font_style++;
49 }
50
51 /* Resolve the name and populate the information structure */
52 pat = FcNameParse((FcChar8 *)font_family);
53 if (font_style != nullptr) FcPatternAddString(pat, FC_STYLE, (FcChar8 *)font_style);
54 FcConfigSubstitute(nullptr, pat, FcMatchPattern);
55 FcDefaultSubstitute(pat);
56 fs = FcFontSetCreate();
57 match = FcFontMatch(nullptr, pat, &result);
58
59 if (fs != nullptr && match != nullptr) {
60 int i;
61 FcChar8 *family;
62 FcChar8 *style;
63 FcChar8 *file;
64 FcFontSetAdd(fs, match);
65
66 for (i = 0; err != FT_Err_Ok && i < fs->nfont; i++) {
67 /* Try the new filename */
68 if (FcPatternGetString(fs->fonts[i], FC_FILE, 0, &file) == FcResultMatch &&
69 FcPatternGetString(fs->fonts[i], FC_FAMILY, 0, &family) == FcResultMatch &&
70 FcPatternGetString(fs->fonts[i], FC_STYLE, 0, &style) == FcResultMatch) {
71
72 /* The correct style? */
73 if (font_style != nullptr && strcasecmp(font_style, (char *)style) != 0) continue;
74
75 /* Font config takes the best shot, which, if the family name is spelled
76 * wrongly a 'random' font, so check whether the family name is the
77 * same as the supplied name */
78 if (strcasecmp(font_family, (char *)family) == 0) {
79 err = FT_New_Face(_library, (char *)file, 0, face);
80 }
81 }
82 }
83 }
84
85 free(font_family);
86 FcPatternDestroy(pat);
87 FcFontSetDestroy(fs);
88 FcFini();
89 }
90
91 return err;
92 }
93
94 #endif /* WITH_FREETYPE */
95
96
97 bool SetFallbackFont(FreeTypeSettings *settings, const char *language_isocode, int winlangid, MissingGlyphSearcher *callback)
98 {
99 if (!FcInit()) return false;
100
101 bool ret = false;
102
103 /* Fontconfig doesn't handle full language isocodes, only the part
104 * before the _ of e.g. en_GB is used, so "remove" everything after
105 * the _. */
106 char lang[16];
107 seprintf(lang, lastof(lang), ":lang=%s", language_isocode);
108 char *split = strchr(lang, '_');
109 if (split != nullptr) *split = '\0';
110
111 /* First create a pattern to match the wanted language. */
112 FcPattern *pat = FcNameParse((FcChar8 *)lang);
113 /* We only want to know the filename. */
114 FcObjectSet *os = FcObjectSetBuild(FC_FILE, FC_SPACING, FC_SLANT, FC_WEIGHT, nullptr);
115 /* Get the list of filenames matching the wanted language. */
116 FcFontSet *fs = FcFontList(nullptr, pat, os);
117
118 /* We don't need these anymore. */
119 FcObjectSetDestroy(os);
120 FcPatternDestroy(pat);
121
122 if (fs != nullptr) {
123 int best_weight = -1;
124 const char *best_font = nullptr;
125
126 for (int i = 0; i < fs->nfont; i++) {
127 FcPattern *font = fs->fonts[i];
128
129 FcChar8 *file = nullptr;
130 FcResult res = FcPatternGetString(font, FC_FILE, 0, &file);
131 if (res != FcResultMatch || file == nullptr) {
132 continue;
133 }
134
135 /* Get a font with the right spacing .*/
136 int value = 0;
137 FcPatternGetInteger(font, FC_SPACING, 0, &value);
138 if (callback->Monospace() != (value == FC_MONO) && value != FC_DUAL) continue;
139
140 /* Do not use those that explicitly say they're slanted. */
141 FcPatternGetInteger(font, FC_SLANT, 0, &value);
142 if (value != 0) continue;
143
144 /* We want the fatter font as they look better at small sizes. */
145 FcPatternGetInteger(font, FC_WEIGHT, 0, &value);
146 if (value <= best_weight) continue;
147
148 callback->SetFontNames(settings, (const char *)file);
149
150 bool missing = callback->FindMissingGlyphs();
151 Debug(freetype, 1, "Font \"{}\" misses{} glyphs", file, missing ? "" : " no");
152
153 if (!missing) {
154 best_weight = value;
155 best_font = (const char *)file;
156 }
157 }
158
159 if (best_font != nullptr) {
160 ret = true;
161 callback->SetFontNames(settings, best_font);
162 InitFreeType(callback->Monospace());
163 }
164
165 /* Clean up the list of filenames. */
166 FcFontSetDestroy(fs);
167 }
168
169 FcFini();
170 return ret;
171 }
MissingGlyphSearcher::FindMissingGlyphs
bool FindMissingGlyphs()
Check whether there are glyphs missing in the current language.
Definition: strings.cpp:2012
MissingGlyphSearcher
A searcher for missing glyphs.
Definition: strings_func.h:242
safeguards.h
settings
fluid_settings_t * settings
FluidSynth settings handle.
Definition: fluidsynth.cpp:21
MissingGlyphSearcher::Monospace
virtual bool Monospace()=0
Whether to search for a monospace font or not.
SetFallbackFont
bool SetFallbackFont(FreeTypeSettings *settings, const char *language_isocode, int winlangid, MissingGlyphSearcher *callback)
We would like to have a fallback font as the current one doesn't contain all characters we need.
Definition: font_unix.cpp:97
ShowInfoF
void CDECL ShowInfoF(const char *str,...)
Shows some information on the console/a popup box depending on the OS.
Definition: openttd.cpp:154
seprintf
int CDECL seprintf(char *str, const char *last, const char *format,...)
Safer implementation of snprintf; same as snprintf except:
Definition: string.cpp:535
InitFreeType
void InitFreeType(bool monospace)
(Re)initialize the freetype related things, i.e.
Definition: fontcache.cpp:681
stredup
char * stredup(const char *s, const char *last)
Create a duplicate of the given string.
Definition: string.cpp:137
GetFontByFaceName
FT_Error GetFontByFaceName(const char *font_name, FT_Face *face)
Load a freetype font face with the given font name.
Definition: font_unix.cpp:28
Debug
#define Debug(name, level, format_string,...)
Ouptut a line of debugging information.
Definition: debug.h:37
MissingGlyphSearcher::SetFontNames
virtual void SetFontNames(struct FreeTypeSettings *settings, const char *font_name, const void *os_data=nullptr)=0
Set the right font names.
free
static void free(const void *ptr)
Version of the standard free that accepts const pointers.
Definition: stdafx.h:460
lastof
#define lastof(x)
Get the last element of an fixed size array.
Definition: stdafx.h:394
FreeTypeSettings
Settings for the freetype fonts.
Definition: fontcache.h:225