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freetype/src/base/ftinit.c
Werner Lemberg 84d3df7501 Implement handling of `FREETYPE_PROPERTIES' environment variable. 
Recognizing properties follows in another commit.

* devel/ftoption.h, include/freetype/config/ftoption.h
(FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES): New macro.

* include/freetype/config/ftstdlib.h (ft_getenv): New macro.

* src/base/ftinit.c (ft_set_default_properties): New function to
parse `FREETYPE_PROPERTIES' and calling `ft_property_string_set'.
(FT_Init_FreeType): Updated.
2016-07-11 00:12:11 +02:00

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/***************************************************************************/
/* */
/* ftinit.c */
/* */
/* FreeType initialization layer (body). */
/* */
/* Copyright 1996-2016 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 FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_DEBUG_H
#include FT_MODULE_H
#include "basepic.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 trace_init
#ifndef FT_CONFIG_OPTION_PIC
#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
};
#else /* FT_CONFIG_OPTION_PIC */
#ifdef __cplusplus
#define FT_EXTERNC extern "C"
#else
#define FT_EXTERNC extern
#endif
/* declare the module's class creation/destruction functions */
#undef FT_USE_MODULE
#define FT_USE_MODULE( type, x ) \
FT_EXTERNC FT_Error \
FT_Create_Class_ ## x( FT_Library library, \
FT_Module_Class* *output_class ); \
FT_EXTERNC void \
FT_Destroy_Class_ ## x( FT_Library library, \
FT_Module_Class* clazz );
#include FT_CONFIG_MODULES_H
/* count all module classes */
#undef FT_USE_MODULE
#define FT_USE_MODULE( type, x ) MODULE_CLASS_ ## x,
enum
{
#include FT_CONFIG_MODULES_H
FT_NUM_MODULE_CLASSES
};
/* destroy all module classes */
#undef FT_USE_MODULE
#define FT_USE_MODULE( type, x ) \
if ( classes[i] ) \
{ \
FT_Destroy_Class_ ## x( library, classes[i] ); \
} \
i++;
FT_BASE_DEF( void )
ft_destroy_default_module_classes( FT_Library library )
{
FT_Module_Class* *classes;
FT_Memory memory;
FT_UInt i;
BasePIC* pic_container = (BasePIC*)library->pic_container.base;
if ( !pic_container->default_module_classes )
return;
memory = library->memory;
classes = pic_container->default_module_classes;
i = 0;
#include FT_CONFIG_MODULES_H
FT_FREE( classes );
pic_container->default_module_classes = NULL;
}
/* initialize all module classes and the pointer table */
#undef FT_USE_MODULE
#define FT_USE_MODULE( type, x ) \
error = FT_Create_Class_ ## x( library, &clazz ); \
if ( error ) \
goto Exit; \
classes[i++] = clazz;
FT_BASE_DEF( FT_Error )
ft_create_default_module_classes( FT_Library library )
{
FT_Error error;
FT_Memory memory;
FT_Module_Class* *classes = NULL;
FT_Module_Class* clazz;
FT_UInt i;
BasePIC* pic_container = (BasePIC*)library->pic_container.base;
memory = library->memory;
pic_container->default_module_classes = NULL;
if ( FT_ALLOC( classes, sizeof ( FT_Module_Class* ) *
( FT_NUM_MODULE_CLASSES + 1 ) ) )
return error;
/* initialize all pointers to 0, especially the last one */
for ( i = 0; i < FT_NUM_MODULE_CLASSES; i++ )
classes[i] = NULL;
classes[FT_NUM_MODULE_CLASSES] = NULL;
i = 0;
#include FT_CONFIG_MODULES_H
Exit:
if ( error )
ft_destroy_default_module_classes( library );
else
pic_container->default_module_classes = classes;
return error;
}
#endif /* FT_CONFIG_OPTION_PIC */
/* 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;
/* FT_DEFAULT_MODULES_GET dereferences `library' in PIC mode */
#ifdef FT_CONFIG_OPTION_PIC
if ( !library )
return;
#endif
/* GCC 4.6 warns the type difference:
* FT_Module_Class** != const FT_Module_Class* const*
*/
cur = (const FT_Module_Class* const*)FT_DEFAULT_MODULES_GET;
/* 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
/*
* Set default properties derived from the `FREETYPE_PROPERTIES'
* environment variable.
*
* `FREETYPE_PROPERTIES' has the following syntax form (broken here into
* multiple lines for better readability)
*
* <optional whitespace>
* <module-name1> ':'
* <property-name1> '=' <property-value1>
* <whitespace>
* <module-name2> ':'
* <property-name2> '=' <property-value2>
* ...
*
* Example:
*
* FREETYPE_PROPERTIES=truetype:interpreter-version=35 \
* cff:no-stem-darkening=1 \
* autofitter:warping=1
*
*/
static 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 );
}
}
#else
static 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;
/* 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 );
return FT_Err_Ok;
}
/* END */
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