/***************************************************************************/ /* */ /* ftmemory.h */ /* */ /* The FreeType memory management macros (specification). */ /* */ /* Copyright 1996-2000 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 #include FT_CONFIG_CONFIG_H #include FT_TYPES_H FT_BEGIN_HEADER /*************************************************************************/ /* */ /* */ /* FT_SET_ERROR */ /* */ /* */ /* 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 ****/ /**** ****/ /**** ****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* FT_Alloc */ /* */ /* */ /* Allocates a new block of memory. The returned area is always */ /* zero-filled; this is a strong convention in many FreeType parts. */ /* */ /* */ /* memory :: A handle to a given `memory object' which handles */ /* allocation. */ /* */ /* size :: The size in bytes of the block to allocate. */ /* */ /* */ /* P :: A pointer to the fresh new block. It should be set to */ /* NULL if `size' is 0, or in case of error. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ FT_BASE( FT_Error ) FT_Alloc( FT_Memory memory, FT_Long size, void* *P ); /*************************************************************************/ /* */ /* */ /* FT_Realloc */ /* */ /* */ /* Reallocates a block of memory pointed to by `*P' to `Size' bytes */ /* from the heap, possibly changing `*P'. */ /* */ /* */ /* 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. */ /* */ /* */ /* P :: A pointer to the fresh new block. It should be set to */ /* NULL if `size' is 0, or in case of error. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ /* */ /* 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 ); /*************************************************************************/ /* */ /* */ /* FT_Free */ /* */ /* */ /* Releases a given block of memory allocated through FT_Alloc(). */ /* */ /* */ /* 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. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ /* */ /* 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 #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. */ /* */ #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_) ) #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 */