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Implement handling of `FREETYPE_PROPERTIES' environment variable.

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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.
This commit is contained in:
Werner Lemberg 2016-07-11 00:12:11 +02:00
parent c3beb30a21
commit 84d3df7501
5 changed files with 188 additions and 1 deletions
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15
ChangeLog
View File

@ -1,3 +1,18 @@
2016-07-10 Werner Lemberg <wl@gnu.org>
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.
2016-07-09 Werner Lemberg <wl@gnu.org>
Add function `ft_property_string_set'.

30
devel/ftoption.h
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@ -75,6 +75,36 @@ FT_BEGIN_HEADER
/*************************************************************************/
/*************************************************************************/
/* */
/* If you enable this configuration option, FreeType recognizes an */
/* environment variable called `FREETYPE_PROPERTIES', which can be used */
/* to control the various font drivers and modules. The controllable */
/* properties are listed in the section `Controlling FreeType Modules' */
/* in the reference's table of contents; currently there are properties */
/* for the auto-hinter (file `ftautoh.h'), CFF (file `ftcffdrv.h'), and */
/* TrueType (file `ftttdrv.h'). */
/* */
/* `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 */
/* */
#define FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES
/*************************************************************************/
/* */
/* Uncomment the line below if you want to activate sub-pixel rendering */

30
include/freetype/config/ftoption.h
View File

@ -75,6 +75,36 @@ FT_BEGIN_HEADER
/*************************************************************************/
/*************************************************************************/
/* */
/* If you enable this configuration option, FreeType recognizes an */
/* environment variable called `FREETYPE_PROPERTIES', which can be used */
/* to control the various font drivers and modules. The controllable */
/* properties are listed in the section `Controlling FreeType Modules' */
/* in the reference's table of contents; currently there are properties */
/* for the auto-hinter (file `ftautoh.h'), CFF (file `ftcffdrv.h'), and */
/* TrueType (file `ftttdrv.h'). */
/* */
/* `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 */
/* */
#define FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES
/*************************************************************************/
/* */
/* Uncomment the line below if you want to activate sub-pixel rendering */

3
include/freetype/config/ftstdlib.h
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@ -142,7 +142,8 @@
/**********************************************************************/
#define ft_atol atol
#define ft_atol atol
#define ft_getenv getenv
/**********************************************************************/

111
src/base/ftinit.c
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@ -226,6 +226,115 @@
}
#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 )
@ -256,6 +365,8 @@
else
FT_Add_Default_Modules( *alibrary );
ft_set_default_properties( *alibrary );
return error;
}