www.pudn.com > freetype.rar > fterrors.h, change:2006-01-20,size:9972b
/***************************************************************************/
/* */
/* fterrors.h */
/* */
/* FreeType error code handling (specification). */
/* */
/* Copyright 1996-2001, 2002 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. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* This special header file is used to define the handling of FT2 */
/* enumeration constants. It can also be used to generate error message */
/* strings with a small macro trick explained below. */
/* */
/* I - Error Formats */
/* ----------------- */
/* */
/* Since release 2.1, the error constants have changed. The lower */
/* byte of the error value gives the "generic" error code, while the */
/* higher byte indicates in which module the error occurred. */
/* */
/* You can use the macro FT_ERROR_BASE(x) macro to extract the generic */
/* error code from an FT_Error value. */
/* */
/* The configuration macro FT_CONFIG_OPTION_USE_MODULE_ERRORS can be */
/* undefined in ftoption.h in order to make the higher byte always */
/* zero, in case you need to be compatible with previous versions of */
/* FreeType 2. */
/* */
/* */
/* II - Error Message strings */
/* -------------------------- */
/* */
/* The error definitions below are made through special macros that */
/* allow client applications to build a table of error message strings */
/* if they need it. The strings are not included in a normal build of */
/* FreeType 2 to save space (most client applications do not use */
/* them). */
/* */
/* To do so, you have to define the following macros before including */
/* this file: */
/* */
/* FT_ERROR_START_LIST :: */
/* This macro is called before anything else to define the start of */
/* the error list. It is followed by several FT_ERROR_DEF calls */
/* (see below). */
/* */
/* FT_ERROR_DEF( e, v, s ) :: */
/* This macro is called to define one single error. */
/* `e' is the error code identifier (e.g. FT_Err_Invalid_Argument). */
/* `v' is the error numerical value. */
/* `s' is the corresponding error string. */
/* */
/* FT_ERROR_END_LIST :: */
/* This macro ends the list. */
/* */
/* Additionally, you have to undefine __FTERRORS_H__ before #including */
/* this file. */
/* */
/* Here is a simple example: */
/* */
/* { */
/* #undef __FTERRORS_H__ */
/* #define FT_ERRORDEF( e, v, s ) { e, s }, */
/* #define FT_ERROR_START_LIST { */
/* #define FT_ERROR_END_LIST { 0, 0 } }; */
/* */
/* const struct */
/* { */
/* int err_code; */
/* const char* err_msg */
/* } ft_errors[] = */
/* */
/* #include "freetype/fterrors.h" */
/* } */
/* */
/*************************************************************************/
#ifndef __FTERRORS_H__
#define __FTERRORS_H__
/* include module base error codes */
#include "freetype/ftmoderr.h"
/*******************************************************************/
/*******************************************************************/
/***** *****/
/***** SETUP MACROS *****/
/***** *****/
/*******************************************************************/
/*******************************************************************/
#undef FT_NEED_EXTERN_C
#undef FT_ERR_XCAT
#undef FT_ERR_CAT
#define FT_ERR_XCAT( x, y ) x ## y
#define FT_ERR_CAT( x, y ) FT_ERR_XCAT( x, y )
/* FT_ERR_PREFIX is used as a prefix for error identifiers. */
/* By default, we use `FT_Err_'. */
/* */
#ifndef FT_ERR_PREFIX
#define FT_ERR_PREFIX FT_Err_
#endif
/* FT_ERR_BASE is used as the base for module-specific errors. */
/* */
#ifdef FT_CONFIG_OPTION_USE_MODULE_ERRORS
#ifndef FT_ERR_BASE
#define FT_ERR_BASE FT_Mod_Err_Base
#endif
#else
#undef FT_ERR_BASE
#define FT_ERR_BASE 0
#endif /* FT_CONFIG_OPTION_USE_MODULE_ERRORS */
/* If FT_ERRORDEF is not defined, we need to define a simple */
/* enumeration type. */
/* */
#ifndef FT_ERRORDEF
#define FT_ERRORDEF( e, v, s ) e = v,
#define FT_ERROR_START_LIST enum {
#define FT_ERROR_END_LIST FT_ERR_CAT( FT_ERR_PREFIX, Max ) };
#ifdef __cplusplus
#define FT_NEED_EXTERN_C
extern "C" {
#endif
#endif /* !FT_ERRORDEF */
/* this macro is used to define an error */
#define FT_ERRORDEF_( e, v, s ) \
FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v + FT_ERR_BASE, s )
/* this is only used for FT_Err_Ok, which must be 0! */
#define FT_NOERRORDEF_( e, v, s ) \
FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v, s )
#ifdef FT_ERROR_START_LIST
FT_ERROR_START_LIST
#endif
/* no include the error codes */
#include "freetype/fterrdef.h"
#ifdef FT_ERROR_END_LIST
FT_ERROR_END_LIST
#endif
/*******************************************************************/
/*******************************************************************/
/***** *****/
/***** SIMPLE CLEANUP *****/
/***** *****/
/*******************************************************************/
/*******************************************************************/
#ifdef FT_NEED_EXTERN_C
}
#endif
#undef FT_ERROR_START_LIST
#undef FT_ERROR_END_LIST
#undef FT_ERRORDEF
#undef FT_ERRORDEF_
#undef FT_NOERRORDEF_
#undef FT_NEED_EXTERN_C
#undef FT_ERR_PREFIX
#undef FT_ERR_BASE
#undef FT_ERR_CONCAT
#endif /* __FTERRORS_H__ */
/* END */