Viewing file:  ftsysmem.h (5.57 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
#ifndef __FT_SYSTEM_MEMORY_H__
#define __FT_SYSTEM_MEMORY_H__
#include <ft2build.h>
FT_BEGIN_HEADER
/***********************************************************************
*
* @type: FT_Memory
*
* @description:
* opaque handle to a memory manager handle. Note that since FreeType
* 2.2, the memory manager structure FT_MemoryRec is hidden to client
* applications.
*
* however, you can still define custom allocators easily using the
* @ft_memory_new API
*/
typedef struct FT_MemoryRec_* FT_Memory;
/***********************************************************************
*
* @functype: FT_Memory_AllocFunc
*
* @description:
* a function used to allocate a block of memory.
*
* @input:
* size :: size of blocks in bytes. Always > 0 !!
* mem_data :: memory-manager specific optional argument
* (see @ft_memory_new)
*
* @return:
* address of new block. NULL in case of memory exhaustion
*/
typedef FT_Pointer (*FT_Memory_AllocFunc)( FT_ULong size,
FT_Pointer mem_data );
/***********************************************************************
*
* @functype: FT_Memory_FreeFunc
*
* @description:
* a function used to release a block of memory created through
* @FT_Memory_AllocFunc or @FT_Memory_ReallocFunc
*
* @input:
* block :: address of target memory block. cannot be NULL !!
* mem_data :: memory-manager specific optional argument
* (see @ft_memory_new)
*/
typedef void (*FT_Memory_FreeFunc) ( FT_Pointer block,
FT_Pointer mem_data );
/***********************************************************************
*
* @functype: FT_Memory_ReallocFunc
*
* @description:
* a function used to reallocate a memory block.
*
* @input:
* block :: address of target memory block. cannot be NULL !!
* new_size :: new requested size in bytes
* cur_size :: current block size in bytes
* mem_data :: memory-manager specific optional argument
* (see @ft_memory_new)
*/
typedef FT_Pointer (*FT_Memory_ReallocFunc)( FT_Pointer block,
FT_ULong new_size,
FT_ULong cur_size,
FT_Pointer mem_data );
/***********************************************************************
*
* @functype: FT_Memory_CreateFunc
*
* @description:
* a function used to create a @FT_Memory object to model a
* memory manager
*
* @input:
* size :: size of memory manager structure in bytes
* init_data :: optional initialisation argument
*
* @output:
* amem_data :: memory-manager specific argument to block management
* routines.
*
* @return:
* handle to new memory manager object. NULL in case of failure
*/
typedef FT_Pointer (*FT_Memory_CreateFunc)( FT_UInt size,
FT_Pointer init_data,
FT_Pointer *amem_data );
/***********************************************************************
*
* @functype: FT_Memory_DestroyFunc
*
* @description:
* a function used to destroy a given @FT_Memory manager
*
* @input:
* memory :: target memory manager handle
* mem_data :: option manager-specific argument
*/
typedef void (*FT_Memory_DestroyFunc)( FT_Memory memory,
FT_Pointer mem_data );
/***********************************************************************
*
* @struct: FT_Memory_FuncsRec
*
* @description:
* a function used to hold all methods of a given memory manager
* implementation.
*
* @fields:
* mem_alloc :: block allocation routine
* mem_free :: block release routine
* mem_realloc :: block re-allocation routine
* mem_create :: manager creation routine
* mem_destroy :: manager destruction routine
*/
typedef struct FT_Memory_FuncsRec_
{
FT_Memory_AllocFunc mem_alloc;
FT_Memory_FreeFunc mem_free;
FT_Memory_ReallocFunc mem_realloc;
FT_Memory_CreateFunc mem_create;
FT_Memory_DestroyFunc mem_destroy;
} FT_Memory_FuncsRec, *FT_Memory_Funcs;
/***********************************************************************
*
* @type: FT_Memory_Funcs
*
* @description:
* a pointer to a constant @FT_Memory_FuncsRec structure used to
* describe a given memory manager implementation.
*/
typedef const FT_Memory_FuncsRec* FT_Memory_Funcs;
/***********************************************************************
*
* @function: ft_memory_new
*
* @description:
* create a new memory manager, given a set of memory methods
*
* @input:
* mem_funcs :: handle to memory manager implementation descriptor
* mem_init_data :: optional initialisation argument, passed to
* @FT_Memory_CreateFunc
*
* @return:
* new memory manager handle. NULL in case of failure
*/
FT_BASE( FT_Memory )
ft_memory_new( FT_Memory_Funcs mem_funcs,
FT_Pointer mem_init_data );
/***********************************************************************
*
* @function: ft_memory_destroy
*
* @description:
* destroy a given memory manager
*
* @input:
* memory :: handle to target memory manager
*/
FT_BASE( void )
ft_memory_destroy( FT_Memory memory );
/* */
FT_END_HEADER
#endif /* __FT_SYSTEM_MEMORY_H__ */
|