jconfig.doc
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上传日期:2007-01-08
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文件大小:5k
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图形图象
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C/C++
- /*
- * jconfig.doc
- *
- * Copyright (C) 1991-1994, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file documents the configuration options that are required to
- * customize the JPEG software for a particular system.
- *
- * The actual configuration options for a particular installation are stored
- * in jconfig.h. On many machines, jconfig.h can be generated automatically
- * or copied from one of the "canned" jconfig files that we supply. But if
- * you need to generate a jconfig.h file by hand, this file tells you how.
- *
- * DO NOT EDIT THIS FILE --- IT WON'T ACCOMPLISH ANYTHING.
- * EDIT A COPY NAMED JCONFIG.H.
- */
- /*
- * These symbols indicate the properties of your machine or compiler.
- * #define the symbol if yes, #undef it if no.
- */
- /* Does your compiler support function prototypes?
- * (If not, you also need to use ansi2knr, see install.doc)
- */
- #define HAVE_PROTOTYPES
- /* Does your compiler support the declaration "unsigned char" ?
- * How about "unsigned short" ?
- */
- #define HAVE_UNSIGNED_CHAR
- #define HAVE_UNSIGNED_SHORT
- /* Define "void" as "char" if your compiler doesn't know about type void.
- * NOTE: be sure to define void such that "void *" represents the most general
- * pointer type, e.g., that returned by malloc().
- */
- /* #define void char */
- /* Define "const" as empty if your compiler doesn't know the "const" keyword.
- */
- /* #define const */
- /* Define this if an ordinary "char" type is unsigned.
- * If you're not sure, leaving it undefined will work at some cost in speed.
- * If you defined HAVE_UNSIGNED_CHAR then the speed difference is minimal.
- */
- #undef CHAR_IS_UNSIGNED
- /* Define this if your system has an ANSI-conforming <stddef.h> file.
- */
- #define HAVE_STDDEF_H
- /* Define this if your system has an ANSI-conforming <stdlib.h> file.
- */
- #define HAVE_STDLIB_H
- /* Define this if your system does not have an ANSI/SysV <string.h>,
- * but does have a BSD-style <strings.h>.
- */
- #undef NEED_BSD_STRINGS
- /* Define this if your system does not provide typedef size_t in any of the
- * ANSI-standard places (stddef.h, stdlib.h, or stdio.h), but places it in
- * <sys/types.h> instead.
- */
- #undef NEED_SYS_TYPES_H
- /* For 80x86 machines, you need to define NEED_FAR_POINTERS,
- * unless you are using a large-data memory model or 80386 flat-memory mode.
- * On less brain-damaged CPUs this symbol must not be defined.
- * (Defining this symbol causes large data structures to be referenced through
- * "far" pointers and to be allocated with a special version of malloc.)
- */
- #undef NEED_FAR_POINTERS
- /* Define this if your linker needs global names to be unique in less
- * than the first 15 characters.
- */
- #undef NEED_SHORT_EXTERNAL_NAMES
- /* Although a real ANSI C compiler can deal perfectly well with pointers to
- * unspecified structures (see "incomplete types" in the spec), a few pre-ANSI
- * and pseudo-ANSI compilers get confused. To keep one of these bozos happy,
- * define INCOMPLETE_TYPES_BROKEN. This is not recommended unless you
- * actually get "missing structure definition" warnings or errors while
- * compiling the JPEG code.
- */
- #undef INCOMPLETE_TYPES_BROKEN
- /*
- * The following options affect code selection within the JPEG library,
- * but they don't need to be visible to applications using the library.
- * To minimize application namespace pollution, the symbols won't be
- * defined unless JPEG_INTERNALS has been defined.
- */
- #ifdef JPEG_INTERNALS
- /* Define this if your compiler implements ">>" on signed values as a logical
- * (unsigned) shift; leave it undefined if ">>" is a signed (arithmetic) shift,
- * which is the normal and rational definition.
- */
- #undef RIGHT_SHIFT_IS_UNSIGNED
- #endif /* JPEG_INTERNALS */
- /*
- * The remaining options do not affect the JPEG library proper,
- * but only the sample applications cjpeg/djpeg (see cjpeg.c, djpeg.c).
- * Other applications can ignore these.
- */
- #ifdef JPEG_CJPEG_DJPEG
- /* These defines indicate which image (non-JPEG) file formats are allowed. */
- #define BMP_SUPPORTED /* BMP image file format */
- #define GIF_SUPPORTED /* GIF image file format */
- #define PPM_SUPPORTED /* PBMPLUS PPM/PGM image file format */
- #undef RLE_SUPPORTED /* Utah RLE image file format */
- #define TARGA_SUPPORTED /* Targa image file format */
- /* Define this if you want to name both input and output files on the command
- * line, rather than using stdout and optionally stdin. You MUST do this if
- * your system can't cope with binary I/O to stdin/stdout. See comments at
- * head of cjpeg.c or djpeg.c.
- */
- #undef TWO_FILE_COMMANDLINE
- /* Define this if your system needs explicit cleanup of temporary files.
- * This is crucial under MS-DOS, where the temporary "files" may be areas
- * of extended memory; on most other systems it's not as important.
- */
- #undef NEED_SIGNAL_CATCHER
- /* By default, we open image files with fopen(...,"rb") or fopen(...,"wb").
- * This is necessary on systems that distinguish text files from binary files,
- * and is harmless on most systems that don't. If you have one of the rare
- * systems that complains about the "b" spec, define this symbol.
- */
- #undef DONT_USE_B_MODE
- /* Define this if you want percent-done progress reports from cjpeg/djpeg.
- */
- #undef PROGRESS_REPORT
- #endif /* JPEG_CJPEG_DJPEG */