/****************************************************************************
*
* ftdebug.h
*
* Debugging and logging component (specification).
*
* Copyright (C) 1996-2019 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.
*
*
* IMPORTANT: A description of FreeType's debugging support can be
* found in 'docs/DEBUG.TXT'. Read it if you need to use or
* understand this code.
*
*/
#ifndef FTDEBUG_H_
#define FTDEBUG_H_
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_FREETYPE_H
FT_BEGIN_HEADER
/* force the definition of FT_DEBUG_LEVEL_ERROR if FT_DEBUG_LEVEL_TRACE */
/* is already defined; this simplifies the following #ifdefs */
/* */
#ifdef FT_DEBUG_LEVEL_TRACE
#undef FT_DEBUG_LEVEL_ERROR
#define FT_DEBUG_LEVEL_ERROR
#endif
/**************************************************************************
*
* Define the trace enums as well as the trace levels array when they are
* needed.
*
*/
#ifdef FT_DEBUG_LEVEL_TRACE
#define FT_TRACE_DEF( x ) trace_ ## x ,
/* defining the enumeration */
typedef enum FT_Trace_
{
#include FT_INTERNAL_TRACE_H
trace_count
} FT_Trace;
/* a pointer to the array of trace levels, */
/* provided by `src/base/ftdebug.c' */
extern int* ft_trace_levels;
#undef FT_TRACE_DEF
#endif /* FT_DEBUG_LEVEL_TRACE */
/**************************************************************************
*
* Define the FT_TRACE macro
*
* IMPORTANT!
*
* Each component must define the macro FT_COMPONENT to a valid FT_Trace
* value before using any TRACE macro.
*
*/
#ifdef FT_DEBUG_LEVEL_TRACE
/* we need two macros here to make cpp expand `FT_COMPONENT' */
#define FT_TRACE_COMP( x ) FT_TRACE_COMP_( x )
#define FT_TRACE_COMP_( x ) trace_ ## x
#define FT_TRACE( level, varformat ) \
do \
{ \
if ( ft_trace_levels[FT_TRACE_COMP( FT_COMPONENT )] >= level ) \
FT_Message varformat; \
} while ( 0 )
#else /* !FT_DEBUG_LEVEL_TRACE */
#define FT_TRACE( level, varformat ) do { } while ( 0 ) /* nothing */
#endif /* !FT_DEBUG_LEVEL_TRACE */
/**************************************************************************
*
* @function:
* FT_Trace_Get_Count
*
* @description:
* Return the number of available trace components.
*
* @return:
* The number of trace components. 0 if FreeType 2 is not built with
* FT_DEBUG_LEVEL_TRACE definition.
*
* @note:
* This function may be useful if you want to access elements of the
* internal trace levels array by an index.
*/
FT_BASE( FT_Int )
FT_Trace_Get_Count( void );
/**************************************************************************
*
* @function:
* FT_Trace_Get_Name
*
* @description:
* Return the name of a trace component.
*
* @input:
* The index of the trace component.
*
* @return:
* The name of the trace component. This is a statically allocated
* C~string, so do not free it after use. `NULL` if FreeType is not
* built with FT_DEBUG_LEVEL_TRACE definition.
*
* @note:
* Use @FT_Trace_Get_Count to get the number of available trace
* components.
*/
FT_BASE( const char* )
FT_Trace_Get_Name( FT_Int idx );
/**************************************************************************
*
* @function:
* FT_Trace_Disable
*
* @description:
* Switch off tracing temporarily. It can be activated again with
* @FT_Trace_Enable.
*/
FT_BASE( void )
FT_Trace_Disable( void );
/**************************************************************************
*
* @function:
* FT_Trace_Enable
*
* @description:
* Activate tracing. Use it after tracing has been switched off with
* @FT_Trace_Disable.
*/
FT_BASE( void )
FT_Trace_Enable( void );
/**************************************************************************
*
* You need two opening and closing parentheses!
*
* Example: FT_TRACE0(( "Value is %i", foo ))
*
* Output of the FT_TRACEX macros is sent to stderr.
*
*/
#define FT_TRACE0( varformat ) FT_TRACE( 0, varformat )
#define FT_TRACE1( varformat ) FT_TRACE( 1, varformat )
#define FT_TRACE2( varformat ) FT_TRACE( 2, varformat )
#define FT_TRACE3( varformat ) FT_TRACE( 3, varformat )
#define FT_TRACE4( varformat ) FT_TRACE( 4, varformat )
#define FT_TRACE5( varformat ) FT_TRACE( 5, varformat )
#define FT_TRACE6( varformat ) FT_TRACE( 6, varformat )
#define FT_TRACE7( varformat ) FT_TRACE( 7, varformat )
/**************************************************************************
*
* Define the FT_ERROR macro.
*
* Output of this macro is sent to stderr.
*
*/
#ifdef FT_DEBUG_LEVEL_ERROR
#define FT_ERROR( varformat ) FT_Message varformat
#else /* !FT_DEBUG_LEVEL_ERROR */
#define FT_ERROR( varformat ) do { } while ( 0 ) /* nothing */
#endif /* !FT_DEBUG_LEVEL_ERROR */
/**************************************************************************
*
* Define the FT_ASSERT and FT_THROW macros. The call to `FT_Throw` makes
* it possible to easily set a breakpoint at this function.
*
*/
#ifdef FT_DEBUG_LEVEL_ERROR
#define FT_ASSERT( condition ) \
do \
{ \
if ( !( condition ) ) \
FT_Panic( "assertion failed on line %d of file %s\n", \
__LINE__, __FILE__ ); \
} while ( 0 )
#define FT_THROW( e ) \
( FT_Throw( FT_ERR_CAT( FT_ERR_PREFIX, e ), \
__LINE__, \
__FILE__ ) | \
FT_ERR_CAT( FT_ERR_PREFIX, e ) )
#else /* !FT_DEBUG_LEVEL_ERROR */
#define FT_ASSERT( condition ) do { } while ( 0 )
#define FT_THROW( e ) FT_ERR_CAT( FT_ERR_PREFIX, e )
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