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[base] Add public API to change log handling function.

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* include/freetype/ftlogging.h (FT_Custom_Log_Handler): New function
typedef to store the custom callback logging function.
(FT_Set_Log_Handler, FT_Set_Default_Log_Handler): New functions to
set and reset custom log handler.

* include/freetype/internal/ftdebug.h (custom_output_handler): New
variable to support a custom callback logging function.
(FT_Logging_Callback): A new function typedef to print log using
custom callback logging function, which is set using
`FT_Set_Log_Handler`.
(FT_Log): Use it.

* src/base/ftdebug.c (FT_Set_Log_Handler,
FT_Set_Default_Log_Handler, FT_Logging_Callback): Add function
definitions.
This commit is contained in:
Priyesh Kumar 2020-08-27 13:01:05 +05:30 committed by Werner Lemberg
parent 5fea76cf0f
commit 2a46d1f04e
4 changed files with 152 additions and 7 deletions
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20
ChangeLog
View File

@ -1,3 +1,23 @@
2020-11-30 Priyesh Kumar <priyeshkkumar@gmail.com>
[base] Add public API to change log handling function.
* include/freetype/ftlogging.h (FT_Custom_Log_Handler): New function
typedef to store the custom callback logging function.
(FT_Set_Log_Handler, FT_Set_Default_Log_Handler): New functions to
set and reset custom log handler.
* include/freetype/internal/ftdebug.h (custom_output_handler): New
variable to support a custom callback logging function.
(FT_Logging_Callback): A new function typedef to print log using
custom callback logging function, which is set using
`FT_Set_Log_Handler`.
(FT_Log): Use it.
* src/base/ftdebug.c (FT_Set_Log_Handler,
FT_Set_Default_Log_Handler, FT_Logging_Callback): Add function
definitions.
2020-11-28 Priyesh Kumar <priyeshkkumar@gmail.com>
[base] Add public API to change the levels of tracing components.

63
include/freetype/ftlogging.h
View File

@ -91,6 +91,69 @@ FT_BEGIN_HEADER
FT_EXPORT( void )
FT_Trace_Set_Default_Level( void );
/**************************************************************************
*
* @functype:
* FT_Custom_Log_Handler
*
* @description:
* A function typedef that is used to handle the logging of tracing and
* debug messages on a file system.
*
* @input:
* ft_component ::
* The name of `FT_COMPONENT` from which the current debug or error
* message is produced.
*
* fmt ::
* Actual debug or tracing message.
*
* args::
* Arguments of debug or tracing messages.
*/
typedef void
(*FT_Custom_Log_Handler)( const char* ft_component,
const char* fmt,
va_list args );
/**************************************************************************
*
* @function:
* FT_Set_Log_Handler
*
* @description:
* A function to set a custom log handler.
*
* @input:
* handler ::
* New logging function.
*
* @note:
* This function is only available if compilation option `@FT_LOGGING`
* is set.
*/
FT_EXPORT( void )
FT_Set_Log_Handler( FT_Custom_Log_Handler handler );
/**************************************************************************
*
* @function:
* FT_Set_Default_Log_Handler
*
* @description:
* A function to undo the effect of @FT_Set_Log_Handler, resetting the
* log handler to FreeType's built-in version.
*
* @note:
* This function is only available if compilation option `@FT_LOGGING`
* is set.
*/
FT_EXPORT( void )
FT_Set_Default_Log_Handler( void );
/* */

31
include/freetype/internal/ftdebug.h
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@ -121,7 +121,12 @@ FT_BEGIN_HEADER
\
ft_add_tag( dlg_tag ); \
if ( ft_trace_levels[FT_TRACE_COMP( FT_COMPONENT )] >= level ) \
dlg_trace varformat; \
{ \
if ( custom_output_handler != NULL ) \
FT_Logging_Callback varformat; \
else \
dlg_trace varformat; \
} \
ft_remove_tag( dlg_tag ); \
} while( 0 )
@ -367,12 +372,16 @@ FT_BEGIN_HEADER
/**************************************************************************
*
* `ft_default_log_handler` stores the function pointer that is used
* internally by FreeType to print logs to a file.
* 1. `ft_default_log_handler` stores the function pointer that is used
* internally by FreeType to print logs to a file.
*
* 2. `custom_output_handler` stores the function pointer to the callback
* function provided by the user.
*
* It is defined in `ftdebug.c`.
*/
extern dlg_handler ft_default_log_handler;
extern dlg_handler ft_default_log_handler;
extern FT_Custom_Log_Handler custom_output_handler;
/**************************************************************************
@ -381,7 +390,6 @@ FT_BEGIN_HEADER
* un-initialize `FILE*`.
*
* These functions are defined in `ftdebug.c`.
*
*/
FT_BASE( void )
ft_logging_init( void );
@ -395,6 +403,7 @@ FT_BEGIN_HEADER
* For printing the name of `FT_COMPONENT` along with the actual log we
* need to add a tag with the name of `FT_COMPONENT`.
*
* These functions are defined in `ftdebug.c`.
*/
FT_BASE( void )
ft_add_tag( const char* tag );
@ -402,6 +411,18 @@ FT_BEGIN_HEADER
FT_BASE( void )
ft_remove_tag( const char* tag );
/**************************************************************************
*
* A function to print log data using a custom callback logging function
* (which is set using `FT_Set_Log_Handler`).
*
* This function is defined in `ftdebug.c`.
*/
FT_BASE( void )
FT_Logging_Callback( const char* fmt,
... );
#endif /* FT_LOGGING */

45
src/base/ftdebug.c
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@ -82,7 +82,10 @@
static FT_Bool ft_have_newline_char = TRUE;
static const char* ft_custom_trace_level = NULL;
dlg_handler ft_default_log_handler = NULL;
/* declared in ftdebug.h */
dlg_handler ft_default_log_handler = NULL;
FT_Custom_Log_Handler custom_output_handler = NULL;
#endif /* FT_LOGGING*/
@ -441,7 +444,7 @@
}
/*************************************************************************
/**************************************************************************
*
* An output log handler for FreeType.
*
@ -518,6 +521,44 @@
ft_debug_init();
}
/**************************************************************************
*
* Functions to handle a custom log handler.
*
*/
/* documentation is in ftlogging.h */
FT_EXPORT_DEF( void )
FT_Set_Log_Handler( FT_Custom_Log_Handler handler )
{
custom_output_handler = handler;
}
/* documentation is in ftlogging.h */
FT_EXPORT_DEF( void )
FT_Set_Default_Log_Handler()
{
custom_output_handler = NULL;
}
/* documentation is in ftdebug.h */
FT_BASE_DEF( void )
FT_Logging_Callback( const char* fmt,
... )
{
va_list ap;
va_start( ap, fmt );
custom_output_handler( ft_component, fmt, ap );
va_end( ap );
}
#endif /* FT_LOGGING */