ref: dd8af39bceb201eb68fc3276a1e12a4ebcac74c0
dir: /sys/src/cmd/gs/jpeg/jconfig.doc/
/* * 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 */