1 /****************************************************************************
2 *
3 * ftinit.c
4 *
5 * FreeType initialization layer (body).
6 *
7 * Copyright (C) 1996-2023 by
8 * David Turner, Robert Wilhelm, and Werner Lemberg.
9 *
10 * This file is part of the FreeType project, and may only be used,
11 * modified, and distributed under the terms of the FreeType project
12 * license, LICENSE.TXT. By continuing to use, modify, or distribute
13 * this file you indicate that you have read the license and
14 * understand and accept it fully.
15 *
16 */
17
18 /**************************************************************************
19 *
20 * The purpose of this file is to implement the following two
21 * functions:
22 *
23 * FT_Add_Default_Modules():
24 * This function is used to add the set of default modules to a
25 * fresh new library object. The set is taken from the header file
26 * `freetype/config/ftmodule.h'. See the document `FreeType 2.0
27 * Build System' for more information.
28 *
29 * FT_Init_FreeType():
30 * This function creates a system object for the current platform,
31 * builds a library out of it, then calls FT_Default_Drivers().
32 *
33 * Note that even if FT_Init_FreeType() uses the implementation of the
34 * system object defined at build time, client applications are still
35 * able to provide their own `ftsystem.c'.
36 *
37 */
38
39
40 #include <ft2build.h>
41 #include FT_CONFIG_CONFIG_H
42 #include <freetype/internal/ftobjs.h>
43 #include <freetype/internal/ftdebug.h>
44 #include <freetype/ftmodapi.h>
45
46
47 /**************************************************************************
48 *
49 * The macro FT_COMPONENT is used in trace mode. It is an implicit
50 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
51 * messages during execution.
52 */
53 #undef FT_COMPONENT
54 #define FT_COMPONENT init
55
56
57 #undef FT_USE_MODULE
58 #ifdef __cplusplus
59 #define FT_USE_MODULE( type, x ) extern "C" const type x;
60 #else
61 #define FT_USE_MODULE( type, x ) extern const type x;
62 #endif
63
64 #include FT_CONFIG_MODULES_H
65
66 #undef FT_USE_MODULE
67 #define FT_USE_MODULE( type, x ) (const FT_Module_Class*)&(x),
68
69 static
70 const FT_Module_Class* const ft_default_modules[] =
71 {
72 #include FT_CONFIG_MODULES_H
73 0
74 };
75
76
77 /* documentation is in ftmodapi.h */
78
79 FT_EXPORT_DEF( void )
80 FT_Add_Default_Modules( FT_Library library )
81 {
82 FT_Error error;
83 const FT_Module_Class* const* cur;
84
85
86 /* GCC 4.6 warns the type difference:
87 * FT_Module_Class** != const FT_Module_Class* const*
88 */
89 cur = (const FT_Module_Class* const*)ft_default_modules;
90
91 /* test for valid `library' delayed to FT_Add_Module() */
92 while ( *cur )
93 {
94 error = FT_Add_Module( library, *cur );
95 /* notify errors, but don't stop */
96 if ( error )
97 FT_TRACE0(( "FT_Add_Default_Module:"
98 " Cannot install `%s', error = 0x%x\n",
99 (*cur)->module_name, error ));
100 cur++;
101 }
102 }
103
104
105 #ifdef FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES
106
107 #define MAX_LENGTH 128
108
109 /* documentation is in ftmodapi.h */
110
111 FT_EXPORT_DEF( void )
112 FT_Set_Default_Properties( FT_Library library )
113 {
114 const char* env;
115 const char* p;
116 const char* q;
117
118 char module_name[MAX_LENGTH + 1];
119 char property_name[MAX_LENGTH + 1];
120 char property_value[MAX_LENGTH + 1];
121
122 int i;
123
124
125 env = ft_getenv( "FREETYPE_PROPERTIES" );
126 if ( !env )
127 return;
128
129 for ( p = env; *p; p++ )
130 {
131 /* skip leading whitespace and separators */
132 if ( *p == ' ' || *p == '\t' )
133 continue;
134
135 /* read module name, followed by `:' */
136 q = p;
137 for ( i = 0; i < MAX_LENGTH; i++ )
138 {
139 if ( !*p || *p == ':' )
140 break;
141 module_name[i] = *p++;
142 }
143 module_name[i] = '\0';
144
145 if ( !*p || *p != ':' || p == q )
146 break;
147
148 /* read property name, followed by `=' */
149 q = ++p;
150 for ( i = 0; i < MAX_LENGTH; i++ )
151 {
152 if ( !*p || *p == '=' )
153 break;
154 property_name[i] = *p++;
155 }
156 property_name[i] = '\0';
157
158 if ( !*p || *p != '=' || p == q )
159 break;
160
161 /* read property value, followed by whitespace (if any) */
162 q = ++p;
163 for ( i = 0; i < MAX_LENGTH; i++ )
164 {
165 if ( !*p || *p == ' ' || *p == '\t' )
166 break;
167 property_value[i] = *p++;
168 }
169 property_value[i] = '\0';
170
171 if ( !( *p == '\0' || *p == ' ' || *p == '\t' ) || p == q )
172 break;
173
174 /* we completely ignore errors */
175 ft_property_string_set( library,
176 module_name,
177 property_name,
178 property_value );
179
180 if ( !*p )
181 break;
182 }
183 }
184
185 #else
186
187 FT_EXPORT_DEF( void )
188 FT_Set_Default_Properties( FT_Library library )
189 {
190 FT_UNUSED( library );
191 }
192
193 #endif
194
195
196 /* documentation is in freetype.h */
197
198 FT_EXPORT_DEF( FT_Error )
199 FT_Init_FreeType( FT_Library *alibrary )
200 {
201 FT_Error error;
202 FT_Memory memory;
203
204
205 #ifdef FT_DEBUG_LOGGING
206 ft_logging_init();
207 #endif
208
209 /* check of `alibrary' delayed to `FT_New_Library' */
210
211 /* First of all, allocate a new system object -- this function is part */
212 /* of the system-specific component, i.e. `ftsystem.c'. */
213
214 memory = FT_New_Memory();
215 if ( !memory )
216 {
217 FT_ERROR(( "FT_Init_FreeType: cannot find memory manager\n" ));
218 return FT_THROW( Unimplemented_Feature );
219 }
220
221 /* build a library out of it, then fill it with the set of */
222 /* default drivers. */
223
224 error = FT_New_Library( memory, alibrary );
225 if ( error )
226 FT_Done_Memory( memory );
227 else
228 FT_Add_Default_Modules( *alibrary );
229
230 FT_Set_Default_Properties( *alibrary );
231
232 return error;
233 }
234
235
236 /* documentation is in freetype.h */
237
238 FT_EXPORT_DEF( FT_Error )
239 FT_Done_FreeType( FT_Library library )
240 {
241 FT_Memory memory;
242
243
244 if ( !library )
245 return FT_THROW( Invalid_Library_Handle );
246
247 memory = library->memory;
248
249 /* Discard the library object */
250 FT_Done_Library( library );
251
252 /* discard memory manager */
253 FT_Done_Memory( memory );
254
255 #ifdef FT_DEBUG_LOGGING
256 ft_logging_deinit();
257 #endif
258
259 return FT_Err_Ok;
260 }
261
262
263 /* END */