forked from minhngoc25a/freetype2
277 lines
8.4 KiB
C
277 lines
8.4 KiB
C
/***************************************************************************/
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/* */
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/* ftsystem.h */
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/* */
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/* FreeType low-level system interface definition (specification). */
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/* */
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/* Copyright 1996-2000 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef __FTSYSTEM_H__
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#define __FTSYSTEM_H__
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#include <ft2build.h>
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FT_BEGIN_HEADER
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/**************************************************************************
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*
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* <Section> system_interface
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*
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* <Title> System Interface
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*
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* <Abstract>
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* How FreeType manages memory and i/o
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*
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* <Description>
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* This section contains various definitions related to memory
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* management and i/o access. You'll need to understand this
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* information if you want to use a custom memory manager or
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* you own input i/o streams
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*
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*/
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/*************************************************************************/
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/* */
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/* M E M O R Y M A N A G E M E N T */
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/* */
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/*************************************************************************/
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/**********************************************************************
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*
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* @type: FT_Memory
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*
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* @description:
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* a handle to a given memory manager object, defined with a
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* @FT_MemoryRec structure.
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*/
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typedef struct FT_MemoryRec_* FT_Memory;
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/**********************************************************************
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*
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* @functype: FT_Alloc_Func
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*
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* @description:
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* a function used to allocate "size" bytes from "memory"
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*
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* @input:
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* memory :: handle to source memory manager
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* size :: size in bytes to allocate
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*
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* @return:
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* address of new memory block. 0 in case of failure
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*/
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typedef void* (*FT_Alloc_Func)( FT_Memory memory,
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long size );
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/**********************************************************************
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*
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* @functype: FT_Free_Func
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*
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* @description:
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* a function used to release a given block of memory
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*
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* @input:
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* memory :: handle to source memory manager
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* block :: address of target memory block
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*/
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typedef void (*FT_Free_Func)( FT_Memory memory,
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void* block );
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/**********************************************************************
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*
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* @functype: FT_Realloc_Func
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*
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* @description:
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* a function used to re-allocate a given block of memory
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*
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* @input:
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* memory :: handle to source memory manager
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* cur_size :: the block's current size in bytes
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* new_size :: the block's requested new size
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* block :: the block's current address
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*
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* @return:
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* new block address. 0 in case of memory shortage.
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*
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* @note:
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* note that in case of error, the old block must still be available
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*/
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typedef void* (*FT_Realloc_Func)( FT_Memory memory,
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long cur_size,
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long new_size,
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void* block );
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/**********************************************************************
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*
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* @struct: FT_MemoryRec
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*
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* @description:
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* a structure used to describe a given memory manager to FreeType 2
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*
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* @fields:
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* user ::
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* alloc ::
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* free ::
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* realloc ::
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*
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*/
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struct FT_MemoryRec_
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{
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void* user;
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FT_Alloc_Func alloc;
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FT_Free_Func free;
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FT_Realloc_Func realloc;
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};
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/*************************************************************************/
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/* */
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/* I / O M A N A G E M E N T */
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/* */
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/*************************************************************************/
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/************************************************************************
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*
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* @type: FT_Stream
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*
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* @description:
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* a handle to an input stream.
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*/
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typedef struct FT_StreamRec_* FT_Stream;
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/************************************************************************
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*
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* @struct: FT_StreamDesc
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*
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* @description:
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* a union type used to store either a long or a pointer. This is
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* used to store a file descriptor or a FILE* in an input stream
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*
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*/
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typedef union FT_StreamDesc_
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{
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long value;
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void* pointer;
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} FT_StreamDesc;
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/************************************************************************
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*
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* @functype: FT_Stream_IO
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*
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* @description:
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* a function used to seek and read data from a given input stream
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*
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* @input:
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* stream :: handle to source stream
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* offset :: offset of read in stream (always from start)
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* buffer :: address of read buffer
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* count :: number of bytes to read from the stream
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*
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* @return:
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* number of bytes effectively read by the stream
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*
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* @note:
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* this function might be called to perform seek / skip with
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* a "count" of 0
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*/
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typedef unsigned long (*FT_Stream_IO)( FT_Stream stream,
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unsigned long offset,
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unsigned char* buffer,
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unsigned long count );
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/************************************************************************
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*
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* @functype: FT_Stream_Close
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*
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* @description:
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* a function used to close a given input stream
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*
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* @input:
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* stream :: handle to target stream
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*/
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typedef void (*FT_Stream_Close)( FT_Stream stream );
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/************************************************************************
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*
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* @struct: FT_StreamRec
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*
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* @description:
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* a structure used to describe an input stream
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*
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* @input:
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* base :: for memory-based stream, this is the address of the first
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* stream byte in memory. this field should always be set to
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* NULL for disk-based streams.
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*
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* size :: the stream size in bytes
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* pos :: the current position within the stream
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*
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* descriptor :: this field is a union that can hold an integer or a pointer
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* it is used by stream implementations to store file
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* descriptors or FILE* pointers..
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*
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* pathname :: this field is completely ignored by FreeType, however,
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* it's often useful during debugging to use it to store
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* the stream's filename, where available
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*
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* read :: the stream's input function
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* close :: the stream close function
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*
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* memory :: memory manager to use to preload frames. this is set
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* internally by FreeType and shouldn't be touched by
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* stream implementations
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*
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* cursor :: this field is set and used internally by FreeType
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* when parsing frames.
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*
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* limit :: this field is set and used internally by FreeType
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* when parsing frames.
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*/
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struct FT_StreamRec_
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{
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unsigned char* base;
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unsigned long size;
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unsigned long pos;
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FT_StreamDesc descriptor;
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FT_StreamDesc pathname;
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FT_Stream_IO read;
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FT_Stream_Close close;
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FT_Memory memory;
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unsigned char* cursor;
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unsigned char* limit;
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};
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/* */
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FT_END_HEADER
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#endif /* __FTSYSTEM_H__ */
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/* END */
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