ref: 03380482ce6c89b015b06dd22efced4aba66d418
dir: /src/base/ftinit.c/
/****************************************************************************
*
* ftinit.c
*
* FreeType initialization layer (body).
*
* Copyright (C) 1996-2021 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
/**************************************************************************
*
* The purpose of this file is to implement the following two
* functions:
*
* FT_Add_Default_Modules():
* This function is used to add the set of default modules to a
* fresh new library object. The set is taken from the header file
* `freetype/config/ftmodule.h'. See the document `FreeType 2.0
* Build System' for more information.
*
* FT_Init_FreeType():
* This function creates a system object for the current platform,
* builds a library out of it, then calls FT_Default_Drivers().
*
* Note that even if FT_Init_FreeType() uses the implementation of the
* system object defined at build time, client applications are still
* able to provide their own `ftsystem.c'.
*
*/
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include <freetype/internal/ftobjs.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/ftmodapi.h>
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT init
#undef FT_USE_MODULE
#ifdef __cplusplus
#define FT_USE_MODULE( type, x ) extern "C" const type x;
#else
#define FT_USE_MODULE( type, x ) extern const type x;
#endif
#include FT_CONFIG_MODULES_H
#undef FT_USE_MODULE
#define FT_USE_MODULE( type, x ) (const FT_Module_Class*)&(x),
static
const FT_Module_Class* const ft_default_modules[] =
{
#include FT_CONFIG_MODULES_H
0
};
/* documentation is in ftmodapi.h */
FT_EXPORT_DEF( void )
FT_Add_Default_Modules( FT_Library library )
{
FT_Error error;
const FT_Module_Class* const* cur;
/* GCC 4.6 warns the type difference:
* FT_Module_Class** != const FT_Module_Class* const*
*/
cur = (const FT_Module_Class* const*)ft_default_modules;
/* test for valid `library' delayed to FT_Add_Module() */
while ( *cur )
{
error = FT_Add_Module( library, *cur );
/* notify errors, but don't stop */
if ( error )
FT_TRACE0(( "FT_Add_Default_Module:"
" Cannot install `%s', error = 0x%x\n",
(*cur)->module_name, error ));
cur++;
}
}
#ifdef FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES
#define MAX_LENGTH 128
/* documentation is in ftmodapi.h */
FT_EXPORT_DEF( void )
FT_Set_Default_Properties( FT_Library library )
{
const char* env;
const char* p;
const char* q;
char module_name[MAX_LENGTH + 1];
char property_name[MAX_LENGTH + 1];
char property_value[MAX_LENGTH + 1];
int i;
env = ft_getenv( "FREETYPE_PROPERTIES" );
if ( !env )
return;
for ( p = env; *p; p++ )
{
/* skip leading whitespace and separators */
if ( *p == ' ' || *p == '\t' )
continue;
/* read module name, followed by `:' */
q = p;
for ( i = 0; i < MAX_LENGTH; i++ )
{
if ( !*p || *p == ':' )
break;
module_name[i] = *p++;
}
module_name[i] = '\0';
if ( !*p || *p != ':' || p == q )
break;
/* read property name, followed by `=' */
q = ++p;
for ( i = 0; i < MAX_LENGTH; i++ )
{
if ( !*p || *p == '=' )
break;
property_name[i] = *p++;
}
property_name[i] = '\0';
if ( !*p || *p != '=' || p == q )
break;
/* read property value, followed by whitespace (if any) */
q = ++p;
for ( i = 0; i < MAX_LENGTH; i++ )
{
if ( !*p || *p == ' ' || *p == '\t' )
break;
property_value[i] = *p++;
}
property_value[i] = '\0';
if ( !( *p == '\0' || *p == ' ' || *p == '\t' ) || p == q )
break;
/* we completely ignore errors */
ft_property_string_set( library,
module_name,
property_name,
property_value );
if ( !*p )
break;
}
}
#else
FT_EXPORT_DEF( void )
FT_Set_Default_Properties( FT_Library library )
{
FT_UNUSED( library );
}
#endif
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Error )
FT_Init_FreeType( FT_Library *alibrary )
{
FT_Error error;
FT_Memory memory;
#ifdef FT_DEBUG_LOGGING
ft_logging_init();
#endif
/* check of `alibrary' delayed to `FT_New_Library' */
/* First of all, allocate a new system object -- this function is part */
/* of the system-specific component, i.e. `ftsystem.c'. */
memory = FT_New_Memory();
if ( !memory )
{
FT_ERROR(( "FT_Init_FreeType: cannot find memory manager\n" ));
return FT_THROW( Unimplemented_Feature );
}
/* build a library out of it, then fill it with the set of */
/* default drivers. */
error = FT_New_Library( memory, alibrary );
if ( error )
FT_Done_Memory( memory );
else
FT_Add_Default_Modules( *alibrary );
FT_Set_Default_Properties( *alibrary );
return error;
}
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Error )
FT_Done_FreeType( FT_Library library )
{
FT_Memory memory;
if ( !library )
return FT_THROW( Invalid_Library_Handle );
memory = library->memory;
/* Discard the library object */
FT_Done_Library( library );
/* discard memory manager */
FT_Done_Memory( memory );
#ifdef FT_DEBUG_LOGGING
ft_logging_deinit();
#endif
return FT_Err_Ok;
}
/* END */