/****************************************************************************
*
* config/public-macros.h
*
* Define a set of compiler macros used in public FreeType headers.
*
* Copyright (C) 2020 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.
*
*/
/*
* The definitions in this file are used by the public FreeType headers
* and thus should be considered part of the public API.
*
* Other compiler-specific macro definitions that are not exposed by the
* FreeType API should go into
* `include/freetype/internal/compiler-macros.h` instead.
*/
#ifndef FREETYPE_CONFIG_PUBLIC_MACROS_H_
#define FREETYPE_CONFIG_PUBLIC_MACROS_H_
/*
* `FT_BEGIN_HEADER` and `FT_END_HEADER` might have already been defined
* by `freetype/config/ftheader.h`, but we don't want to include this
* header here, so redefine the macros here only when needed. Their
* definition is very stable, so keeping them in sync with the ones in the
* header should not be a maintenance issue.
*/
#ifndef FT_BEGIN_HEADER
#ifdef __cplusplus
#define FT_BEGIN_HEADER extern "C" {
#else
#define FT_BEGIN_HEADER /* empty */
#endif
#endif /* FT_BEGIN_HEADER */
#ifndef FT_END_HEADER
#ifdef __cplusplus
#define FT_END_HEADER }
#else
#define FT_END_HEADER /* empty */
#endif
#endif /* FT_END_HEADER */
FT_BEGIN_HEADER
/*
* Mark a function declaration as public. This ensures it will be
* properly exported to client code. Place this before a function
* declaration.
*
* NOTE: This macro should be considered an internal implementation
* detail, and not part of the FreeType API. It is only defined here
* because it is needed by `FT_EXPORT`.
*/
/* Visual C, mingw */
#if defined( _WIN32 )
#if defined( FT2_BUILD_LIBRARY ) && defined( DLL_EXPORT )
#define FT_PUBLIC_FUNCTION_ATTRIBUTE __declspec( dllexport )
#elif defined( DLL_IMPORT )
#define FT_PUBLIC_FUNCTION_ATTRIBUTE __declspec( dllimport )
#endif
/* gcc, clang */
#elif ( defined( __GNUC__ ) && __GNUC__ >= 4 ) || defined( __clang__ )
#define FT_PUBLIC_FUNCTION_ATTRIBUTE \
__attribute__(( visibility( "default" ) ))
/* Sun */
#elif defined( __SUNPRO_C ) && __SUNPRO_C >= 0x550
#define FT_PUBLIC_FUNCTION_ATTRIBUTE __global
#endif
#ifndef FT_PUBLIC_FUNCTION_ATTRIBUTE
#define FT_PUBLIC_FUNCTION_ATTRIBUTE /* empty */
#endif
/*
* Define a public FreeType API function. This ensures it is properly
* exported or imported at build time. The macro parameter is the
* function's return type as in:
*
* FT_EXPORT( FT_Bool )
* FT_Object_Method( FT_Object obj,
* ... );
*
* NOTE: This requires that all `FT_EXPORT` uses are inside
* `FT_BEGIN_HEADER ... FT_END_HEADER` blocks. This guarantees that the
* functions are exported with C linkage, even when the header is included
* by a C++ source file.
*/
#define FT_EXPORT( x ) FT_PUBLIC_FUNCTION_ATTRIBUTE extern x
/*
* `FT_UNUSED` indicates that a given parameter is not used -- this is
* only used to get rid of unpleasant compiler warnings.
*
* Technically, this was not meant to be part of the public API, but some
* third-party code depends on it.
*/
#ifndef FT_UNUSED
#define FT_UNUSED( arg ) ( (arg) = (arg) )
#endif
FT_END_HEADER
#endif /* FREETYPE_CONFIG_PUBLIC_MACROS_H_ */
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