1 /**************************************************************************** 2 * 3 * ftinit.c 4 * 5 * FreeType initialization layer (body). 6 * 7 * Copyright 1996-2018 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 FT_INTERNAL_OBJECTS_H 43 #include FT_INTERNAL_DEBUG_H 44 #include FT_MODULE_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 trace_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 ) FT_Add_Default_Modules(FT_Library library)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 ) FT_Set_Default_Properties(FT_Library library)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 } 181 182 #else 183 184 FT_EXPORT_DEF( void ) FT_Set_Default_Properties(FT_Library library)185 FT_Set_Default_Properties( FT_Library library ) 186 { 187 FT_UNUSED( library ); 188 } 189 190 #endif 191 192 193 /* documentation is in freetype.h */ 194 195 FT_EXPORT_DEF( FT_Error ) FT_Init_FreeType(FT_Library * alibrary)196 FT_Init_FreeType( FT_Library *alibrary ) 197 { 198 FT_Error error; 199 FT_Memory memory; 200 201 202 /* check of `alibrary' delayed to `FT_New_Library' */ 203 204 /* First of all, allocate a new system object -- this function is part */ 205 /* of the system-specific component, i.e. `ftsystem.c'. */ 206 207 memory = FT_New_Memory(); 208 if ( !memory ) 209 { 210 FT_ERROR(( "FT_Init_FreeType: cannot find memory manager\n" )); 211 return FT_THROW( Unimplemented_Feature ); 212 } 213 214 /* build a library out of it, then fill it with the set of */ 215 /* default drivers. */ 216 217 error = FT_New_Library( memory, alibrary ); 218 if ( error ) 219 FT_Done_Memory( memory ); 220 else 221 FT_Add_Default_Modules( *alibrary ); 222 223 FT_Set_Default_Properties( *alibrary ); 224 225 return error; 226 } 227 228 229 /* documentation is in freetype.h */ 230 231 FT_EXPORT_DEF( FT_Error ) FT_Done_FreeType(FT_Library library)232 FT_Done_FreeType( FT_Library library ) 233 { 234 FT_Memory memory; 235 236 237 if ( !library ) 238 return FT_THROW( Invalid_Library_Handle ); 239 240 memory = library->memory; 241 242 /* Discard the library object */ 243 FT_Done_Library( library ); 244 245 /* discard memory manager */ 246 FT_Done_Memory( memory ); 247 248 return FT_Err_Ok; 249 } 250 251 252 /* END */ 253