/**************************************************************************** * * ftsystem.h * * FreeType low-level system interface definition (specification). * * Copyright (C) 1996-2023 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 FTSYSTEM_H_ #define FTSYSTEM_H_ FT_BEGIN_HEADER /************************************************************************** * * @section: * system_interface * * @title: * System Interface * * @abstract: * How FreeType manages memory and i/o. * * @description: * This section contains various definitions related to memory management * and i/o access. You need to understand this information if you want to * use a custom memory manager or you own i/o streams. * */ /************************************************************************** * * M E M O R Y M A N A G E M E N T * */ /************************************************************************** * * @type: * FT_Memory * * @description: * A handle to a given memory manager object, defined with an * @FT_MemoryRec structure. * */ FT_Memory; /************************************************************************** * * @functype: * FT_Alloc_Func * * @description: * A function used to allocate `size` bytes from `memory`. * * @input: * memory :: * A handle to the source memory manager. * * size :: * The size in bytes to allocate. * * @return: * Address of new memory block. 0~in case of failure. * */ FT_Alloc_Func; /************************************************************************** * * @functype: * FT_Free_Func * * @description: * A function used to release a given block of memory. * * @input: * memory :: * A handle to the source memory manager. * * block :: * The address of the target memory block. * */ FT_Free_Func; /************************************************************************** * * @functype: * FT_Realloc_Func * * @description: * A function used to re-allocate a given block of memory. * * @input: * memory :: * A handle to the source memory manager. * * cur_size :: * The block's current size in bytes. * * new_size :: * The block's requested new size. * * block :: * The block's current address. * * @return: * New block address. 0~in case of memory shortage. * * @note: * In case of error, the old block must still be available. * */ FT_Realloc_Func; /************************************************************************** * * @struct: * FT_MemoryRec * * @description: * A structure used to describe a given memory manager to FreeType~2. * * @fields: * user :: * A generic typeless pointer for user data. * * alloc :: * A pointer type to an allocation function. * * free :: * A pointer type to an memory freeing function. * * realloc :: * A pointer type to a reallocation function. * */ struct FT_MemoryRec_ { … }; /************************************************************************** * * I / O M A N A G E M E N T * */ /************************************************************************** * * @type: * FT_Stream * * @description: * A handle to an input stream. * * @also: * See @FT_StreamRec for the publicly accessible fields of a given stream * object. * */ FT_Stream; /************************************************************************** * * @struct: * FT_StreamDesc * * @description: * A union type used to store either a long or a pointer. This is used * to store a file descriptor or a `FILE*` in an input stream. * */ FT_StreamDesc; /************************************************************************** * * @functype: * FT_Stream_IoFunc * * @description: * A function used to seek and read data from a given input stream. * * @input: * stream :: * A handle to the source stream. * * offset :: * The offset from the start of the stream to seek to. * * buffer :: * The address of the read buffer. * * count :: * The number of bytes to read from the stream. * * @return: * If count >~0, return the number of bytes effectively read by the * stream (after seeking to `offset`). If count ==~0, return the status * of the seek operation (non-zero indicates an error). * */ FT_Stream_IoFunc; /************************************************************************** * * @functype: * FT_Stream_CloseFunc * * @description: * A function used to close a given input stream. * * @input: * stream :: * A handle to the target stream. * */ FT_Stream_CloseFunc; /************************************************************************** * * @struct: * FT_StreamRec * * @description: * A structure used to describe an input stream. * * @input: * base :: * For memory-based streams, this is the address of the first stream * byte in memory. This field should always be set to `NULL` for * disk-based streams. * * size :: * The stream size in bytes. * * In case of compressed streams where the size is unknown before * actually doing the decompression, the value is set to 0x7FFFFFFF. * (Note that this size value can occur for normal streams also; it is * thus just a hint.) * * pos :: * The current position within the stream. * * descriptor :: * This field is a union that can hold an integer or a pointer. It is * used by stream implementations to store file descriptors or `FILE*` * pointers. * * pathname :: * This field is completely ignored by FreeType. However, it is often * useful during debugging to use it to store the stream's filename * (where available). * * read :: * The stream's input function. * * close :: * The stream's close function. * * memory :: * The memory manager to use to preload frames. This is set internally * by FreeType and shouldn't be touched by stream implementations. * * cursor :: * This field is set and used internally by FreeType when parsing * frames. In particular, the `FT_GET_XXX` macros use this instead of * the `pos` field. * * limit :: * This field is set and used internally by FreeType when parsing * frames. * */ FT_StreamRec; /* */ FT_END_HEADER #endif /* FTSYSTEM_H_ */ /* END */
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