kc3-lang/freetype/src/autofit/ft-hb.c

Branch - branch -masterv2.13

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• Hash : 3ccc27dc
  Author :
  Date : 2025-06-19T08:06:53
  

  [autofit] Really fix handling of `RTLD_DEFAULT`.
  
  This commit actually implements what commit 43ec023e1a7 describes.
  
  * src/autofit/ft-hb.c (FT_RTLD_FLAGS): New macro for `dlopen`; it uses
    `RTLD_GLOBAL` only if `RTLD_DEFAULT` is available.
  

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• src/autofit/ft-hb.c

• /****************************************************************************
   *
   * ft-hb.c
   *
   *   FreeType-HarfBuzz bridge (body).
   *
   * Copyright (C) 2025 by
   * Behdad Esfahbod.
   *
   * 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.
   *
   */
  
  
  #if !defined( _WIN32 ) && !defined( _GNU_SOURCE )
  #  define _GNU_SOURCE  1  /* for RTLD_DEFAULT */
  #endif
  
  #include <freetype/freetype.h>
  #include <freetype/internal/ftmemory.h>
  
  #include "afglobal.h"
  
  #include "ft-hb.h"
  
  
  #if defined( FT_CONFIG_OPTION_USE_HARFBUZZ )         && \
      defined( FT_CONFIG_OPTION_USE_HARFBUZZ_DYNAMIC )
  
  #ifndef FT_LIBHARFBUZZ
  #  ifdef _WIN32
  #    define FT_LIBHARFBUZZ "libharfbuzz-0.dll"
  #  else
  #    ifdef __APPLE__
  #      define FT_LIBHARFBUZZ "libharfbuzz.0.dylib"
  #    else
  #      define FT_LIBHARFBUZZ "libharfbuzz.so.0"
  #    endif
  #  endif
  #endif
  
  #ifdef _WIN32
  
  #  include <windows.h>
  
  #else /* !_WIN32 */
  
  #  include <dlfcn.h>
  
    /* The GCC pragma suppresses the warning "ISO C forbids     */
    /* assignment between function pointer and 'void *'", which */
    /* inevitably gets emitted with `-Wpedantic`; see the man   */
    /* page of function `dlsym` for more information.           */
  #  if defined( __GNUC__ )
  #    pragma GCC diagnostic push
  #    ifndef __cplusplus
  #      pragma GCC diagnostic ignored "-Wpedantic"
  #    endif
  #  endif
  
  #endif /* !_WIN32 */
  
  
    FT_LOCAL_DEF( void )
    ft_hb_funcs_init( struct AF_ModuleRec_  *af_module )
    {
      FT_Memory  memory = af_module->root.memory;
      FT_Error   error;
  
      ft_hb_funcs_t                *funcs           = NULL;
      ft_hb_version_atleast_func_t  version_atleast = NULL;
  
  #ifdef _WIN32
      HANDLE  lib;
  #  define DLSYM( lib, name ) \
              (ft_ ## name ## _func_t)GetProcAddress( lib, #name )
  #else
      void  *lib;
  #  define DLSYM( lib, name ) \
              (ft_ ## name ## _func_t)dlsym( lib, #name )
  #endif
  
  
      af_module->hb_funcs = NULL;
  
      if ( FT_NEW( funcs ) )
        return;
      FT_ZERO( funcs );
  
  #ifdef _WIN32
  
      lib = LoadLibraryA( FT_LIBHARFBUZZ );
      if ( !lib )
        goto Fail;
      version_atleast = DLSYM( lib, hb_version_atleast );
  
  #else /* !_WIN32 */
  
  #  ifdef RTLD_DEFAULT
  #    define FT_RTLD_FLAGS RTLD_LAZY | RTLD_GLOBAL
      lib             = RTLD_DEFAULT;
      version_atleast = DLSYM( lib, hb_version_atleast );
  #  else
  #    define FT_RTLD_FLAGS RTLD_LAZY
  #  endif
  
      if ( !version_atleast )
      {
        /* Load the HarfBuzz library.
         *
         * We never close the library, since we opened it with RTLD_GLOBAL.
         * This is important for the case where we are using HarfBuzz as a
         * shared library, and we want to use the symbols from the library in
         * other shared libraries or clients.  HarfBuzz holds onto global
         * variables, and closing the library will cause them to be
         * invalidated.
         */
        lib = dlopen( FT_LIBHARFBUZZ, FT_RTLD_FLAGS );
        if ( !lib )
          goto Fail;
        version_atleast = DLSYM( lib, hb_version_atleast );
      }
  
  #endif /* !_WIN32 */
  
      if ( !version_atleast )
        goto Fail;
  
      /* Load all symbols we use. */
  #define HB_EXTERN( ret, name, args )  \
    {                                   \
      funcs->name = DLSYM( lib, name ); \
      if ( !funcs->name )               \
        goto Fail;                      \
    }
  #include "ft-hb-decls.h"
  #undef HB_EXTERN
  
  #undef DLSYM
  
      af_module->hb_funcs = funcs;
      return;
  
    Fail:
      if ( funcs )
        FT_FREE( funcs );
    }
  
  
    FT_LOCAL_DEF( void )
    ft_hb_funcs_done( struct AF_ModuleRec_  *af_module )
    {
      FT_Memory  memory = af_module->root.memory;
  
  
      if ( af_module->hb_funcs )
      {
        FT_FREE( af_module->hb_funcs );
        af_module->hb_funcs = NULL;
      }
    }
  
  
    FT_LOCAL_DEF( FT_Bool )
    ft_hb_enabled( struct AF_FaceGlobalsRec_  *globals )
    {
      return globals->module->hb_funcs != NULL;
    }
  
  #ifndef _WIN32
  #  if defined( __GNUC__ )
  #    pragma GCC diagnostic pop
  #  endif
  #endif
  
  #else /* !FT_CONFIG_OPTION_USE_HARFBUZZ_DYNAMIC */
  
    FT_LOCAL_DEF( FT_Bool )
    ft_hb_enabled( struct AF_FaceGlobalsRec_  *globals )
    {
      FT_UNUSED( globals );
  
  #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
      return TRUE;
  #else
      return FALSE;
  #endif
    }
  
  #endif /* !FT_CONFIG_OPTION_USE_HARFBUZZ_DYNAMIC */
  
  
  /* END */
  

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