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/***************************************************************************/
/* */
/* ftmemory.h */
/* */
/* The FreeType memory management macros (specification). */
/* */
/* Copyright 1996-2001 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. */
/* */
/***************************************************************************/
#ifndef __FTMEMORY_H__
#define __FTMEMORY_H__
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_TYPES_H
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <Macro> */
/* FT_SET_ERROR */
/* */
/* <Description> */
/* This macro is used to set an implicit `error' variable to a given */
/* expression's value (usually a function call), and convert it to a */
/* boolean which is set whenever the value is != 0. */
/* */
#undef FT_SET_ERROR
#define FT_SET_ERROR( expression ) \
( ( error = (expression) ) != 0 )
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** M E M O R Y ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#ifdef FT_DEBUG_MEMORY
FT_BASE( FT_Error )
FT_Alloc_Debug( FT_Memory memory,
FT_Long size,
void* *P,
const char* file_name,
FT_Long line_no );
#endif
/*************************************************************************/
/* */
/* <Function> */
/* FT_Alloc */
/* */
/* <Description> */
/* Allocates a new block of memory. The returned area is always */
/* zero-filled; this is a strong convention in many FreeType parts. */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* allocation. */
/* */
/* size :: The size in bytes of the block to allocate. */
/* */
/* <Output> */
/* P :: A pointer to the fresh new block. It should be set to */
/* NULL if `size' is 0, or in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_BASE( FT_Error )
FT_Alloc( FT_Memory memory,
FT_Long size,
void* *P );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Realloc */
/* */
/* <Description> */
/* Reallocates a block of memory pointed to by `*P' to `Size' bytes */
/* from the heap, possibly changing `*P'. */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* reallocation. */
/* */
/* current :: The current block size in bytes. */
/* */
/* size :: The new block size in bytes. */
/* */
/* <InOut> */
/* P :: A pointer to the fresh new block. It should be set to */
/* NULL if `size' is 0, or in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* All callers of FT_Realloc() _must_ provide the current block size */
/* as well as the new one. */
/* */
FT_BASE( FT_Error )
FT_Realloc( FT_Memory memory,
FT_Long current,
FT_Long size,
void** P );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Free */
/* */
/* <Description> */
/* Releases a given block of memory allocated through FT_Alloc(). */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* memory deallocation */
/* */
/* P :: This is the _address_ of a _pointer_ which points to the */
/* allocated block. It is always set to NULL on exit. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If P or *P are NULL, this function should return successfully. */
/* This is a strong convention within all of FreeType and its */
/* drivers. */
/* */
FT_BASE( void )
FT_Free( FT_Memory memory,
void** P );
/* This `#include' is needed by the MEM_xxx() macros; it should be */
/* available on all platforms we know of. */
#include <string.h>
#define MEM_Set( dest, byte, count ) memset( dest, byte, count )
#define MEM_Copy( dest, source, count ) memcpy( dest, source, count )
#define MEM_Move( dest, source, count ) memmove( dest, source, count )
/*************************************************************************/
/* */
/* We now support closures to produce completely reentrant code. This */
/* means the allocation functions now takes an additional argument */
/* (`memory'). It is a handle to a given memory object, responsible for */
/* all low-level operations, including memory management and */
/* synchronisation. */
/* */
/* In order to keep our code readable and use the same macros in the */
/* font drivers and the rest of the library, MEM_Alloc(), ALLOC(), and */
/* ALLOC_ARRAY() now use an implicit variable, `memory'. It must be */
/* defined at all locations where a memory operation is queried. */
/* */
#ifdef FT_DEBUG_MEMORY
# define MEM_Alloc( _pointer_, _size_ ) \
FT_Alloc_Debug( memory, _size_, (void**)&(_pointer_), __FILE__, __LINE__ )
# define MEM_Alloc_Array( _pointer_, _count_, _type_ ) \
FT_Alloc_Debug( memory, (_count_)*sizeof ( _type_ ), \
(void**)&(_pointer_), __FILE__, __LINE__ )
#else /* !FT_DEBUG_MEMORY */
# define MEM_Alloc( _pointer_, _size_ ) \
FT_Alloc( memory, _size_, (void**)&(_pointer_) )
# define MEM_Alloc_Array( _pointer_, _count_, _type_ ) \
FT_Alloc( memory, (_count_)*sizeof ( _type_ ), \
(void**)&(_pointer_) )
#endif /* !FT_DEBUG_MEMORY */
#define MEM_Realloc( _pointer_, _current_, _size_ ) \
FT_Realloc( memory, _current_, _size_, (void**)&(_pointer_) )
#define MEM_Realloc_Array( _pointer_, _current_, _new_, _type_ ) \
FT_Realloc( memory, (_current_)*sizeof ( _type_ ), \
(_new_)*sizeof ( _type_ ), (void**)&(_pointer_) )
#define ALLOC( _pointer_, _size_ ) \
FT_SET_ERROR( MEM_Alloc( _pointer_, _size_ ) )
#define REALLOC( _pointer_, _current_, _size_ ) \
FT_SET_ERROR( MEM_Realloc( _pointer_, _current_, _size_ ) )
#define ALLOC_ARRAY( _pointer_, _count_, _type_ ) \
FT_SET_ERROR( MEM_Alloc( _pointer_, \
(_count_)*sizeof ( _type_ ) ) )
#define REALLOC_ARRAY( _pointer_, _current_, _count_, _type_ ) \
FT_SET_ERROR( MEM_Realloc( _pointer_, \
(_current_)*sizeof ( _type_ ), \
(_count_)*sizeof ( _type_ ) ) )
#define FREE( _pointer_ ) FT_Free( memory, (void**)&(_pointer_) )
FT_END_HEADER
#endif /* __FTMEMORY_H__ */
/* END */
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