freetype2/include/freetype/ftmoderr.h

/****************************************************************************
 *
 * ftmoderr.h
 *
 *   FreeType module error offsets (specification).
 *
 * Copyright (C) 2001-2021 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 file is used to define the FreeType module error codes.
   *
   * If the macro `FT_CONFIG_OPTION_USE_MODULE_ERRORS` in `ftoption.h` is
   * set, the lower byte of an error value identifies the error code as
   * usual.  In addition, the higher byte identifies the module.  For
   * example, the error `FT_Err_Invalid_File_Format` has value 0x0003, the
   * error `TT_Err_Invalid_File_Format` has value 0x1303, the error
   * `T1_Err_Invalid_File_Format` has value 0x1403, etc.
   *
   * Note that `FT_Err_Ok`, `TT_Err_Ok`, etc. are always equal to zero,
   * including the high byte.
   *
   * If `FT_CONFIG_OPTION_USE_MODULE_ERRORS` isn't set, the higher byte of an
   * error value is set to zero.
   *
   * To hide the various `XXX_Err_` prefixes in the source code, FreeType
   * provides some macros in `fttypes.h`.
   *
   *   FT_ERR( err )
   *
   *     Add current error module prefix (as defined with the `FT_ERR_PREFIX`
   *     macro) to `err`.  For example, in the BDF module the line
   *
   *     ```
   *       error = FT_ERR( Invalid_Outline );
   *     ```
   *
   *     expands to
   *
   *     ```
   *       error = BDF_Err_Invalid_Outline;
   *     ```
   *
   *     For simplicity, you can always use `FT_Err_Ok` directly instead of
   *     `FT_ERR( Ok )`.
   *
   *   FT_ERR_EQ( errcode, err )
   *   FT_ERR_NEQ( errcode, err )
   *
   *     Compare error code `errcode` with the error `err` for equality and
   *     inequality, respectively.  Example:
   *
   *     ```
   *       if ( FT_ERR_EQ( error, Invalid_Outline ) )
   *         ...
   *     ```
   *
   *     Using this macro you don't have to think about error prefixes.  Of
   *     course, if module errors are not active, the above example is the
   *     same as
   *
   *     ```
   *       if ( error == FT_Err_Invalid_Outline )
   *         ...
   *     ```
   *
   *   FT_ERROR_BASE( errcode )
   *   FT_ERROR_MODULE( errcode )
   *
   *     Get base error and module error code, respectively.
   *
   * It can also be used to create a module error message table easily with
   * something like
   *
   * ```
   *   #undef FTMODERR_H_
   *   #define FT_MODERRDEF( e, v, s )  { FT_Mod_Err_ ## e, s },
   *   #define FT_MODERR_START_LIST     {
   *   #define FT_MODERR_END_LIST       { 0, 0 } };
   *
   *   const struct
   *   {
   *     int          mod_err_offset;
   *     const char*  mod_err_msg
   *   } ft_mod_errors[] =
   *
   *   #include <freetype/ftmoderr.h>
   * ```
   *
   */


#ifndef FTMODERR_H_
#define FTMODERR_H_


  /*******************************************************************/
  /*******************************************************************/
  /*****                                                         *****/
  /*****                       SETUP MACROS                      *****/
  /*****                                                         *****/
  /*******************************************************************/
  /*******************************************************************/


#undef  FT_NEED_EXTERN_C

#ifndef FT_MODERRDEF

#ifdef FT_CONFIG_OPTION_USE_MODULE_ERRORS
#define FT_MODERRDEF( e, v, s )  FT_Mod_Err_ ## e = v,
#else
#define FT_MODERRDEF( e, v, s )  FT_Mod_Err_ ## e = 0,
#endif

#define FT_MODERR_START_LIST  enum {
#define FT_MODERR_END_LIST    FT_Mod_Err_Max };

#ifdef __cplusplus
#define FT_NEED_EXTERN_C
  extern "C" {
#endif

#endif /* !FT_MODERRDEF */


  /*******************************************************************/
  /*******************************************************************/
  /*****                                                         *****/
  /*****               LIST MODULE ERROR BASES                   *****/
  /*****                                                         *****/
  /*******************************************************************/
  /*******************************************************************/


#ifdef FT_MODERR_START_LIST
  FT_MODERR_START_LIST
#endif


  FT_MODERRDEF( Base,      0x000, "base module" )
  FT_MODERRDEF( Autofit,   0x100, "autofitter module" )
  FT_MODERRDEF( BDF,       0x200, "BDF module" )
  FT_MODERRDEF( Bzip2,     0x300, "Bzip2 module" )
  FT_MODERRDEF( Cache,     0x400, "cache module" )
  FT_MODERRDEF( CFF,       0x500, "CFF module" )
  FT_MODERRDEF( CID,       0x600, "CID module" )
  FT_MODERRDEF( Gzip,      0x700, "Gzip module" )
  FT_MODERRDEF( LZW,       0x800, "LZW module" )
  FT_MODERRDEF( OTvalid,   0x900, "OpenType validation module" )
  FT_MODERRDEF( PCF,       0xA00, "PCF module" )
  FT_MODERRDEF( PFR,       0xB00, "PFR module" )
  FT_MODERRDEF( PSaux,     0xC00, "PS auxiliary module" )
  FT_MODERRDEF( PShinter,  0xD00, "PS hinter module" )
  FT_MODERRDEF( PSnames,   0xE00, "PS names module" )
  FT_MODERRDEF( Raster,    0xF00, "raster module" )
  FT_MODERRDEF( SFNT,     0x1000, "SFNT module" )
  FT_MODERRDEF( Smooth,   0x1100, "smooth raster module" )
  FT_MODERRDEF( TrueType, 0x1200, "TrueType module" )
  FT_MODERRDEF( Type1,    0x1300, "Type 1 module" )
  FT_MODERRDEF( Type42,   0x1400, "Type 42 module" )
  FT_MODERRDEF( Winfonts, 0x1500, "Windows FON/FNT module" )
  FT_MODERRDEF( GXvalid,  0x1600, "GX validation module" )
  FT_MODERRDEF( Sdf,      0x1700, "Signed distance field raster module" )


#ifdef FT_MODERR_END_LIST
  FT_MODERR_END_LIST
#endif


  /*******************************************************************/
  /*******************************************************************/
  /*****                                                         *****/
  /*****                      CLEANUP                            *****/
  /*****                                                         *****/
  /*******************************************************************/
  /*******************************************************************/


#ifdef FT_NEED_EXTERN_C
  }
#endif

#undef FT_MODERR_START_LIST
#undef FT_MODERR_END_LIST
#undef FT_MODERRDEF
#undef FT_NEED_EXTERN_C


#endif /* FTMODERR_H_ */


/* END */