1 /* 2 * jconfig.txt 3 * 4 * Copyright (C) 1991-1994, Thomas G. Lane. 5 * Modified 2009-2013 by Guido Vollbeding. 6 * This file is part of the Independent JPEG Group's software. 7 * For conditions of distribution and use, see the accompanying README file. 8 * 9 * This file documents the configuration options that are required to 10 * customize the JPEG software for a particular system. 11 * 12 * The actual configuration options for a particular installation are stored 13 * in jconfig.h. On many machines, jconfig.h can be generated automatically 14 * or copied from one of the "canned" jconfig files that we supply. But if 15 * you need to generate a jconfig.h file by hand, this file tells you how. 16 * 17 * DO NOT EDIT THIS FILE --- IT WON'T ACCOMPLISH ANYTHING. 18 * EDIT A COPY NAMED JCONFIG.H. 19 */ 20 21 22 /* 23 * These symbols indicate the properties of your machine or compiler. 24 * #define the symbol if yes, #undef it if no. 25 */ 26 27 /* Does your compiler support function prototypes? 28 * (If not, you also need to use ansi2knr, see install.txt) 29 */ 30 #define HAVE_PROTOTYPES 31 32 /* Does your compiler support the declaration "unsigned char" ? 33 * How about "unsigned short" ? 34 */ 35 #define HAVE_UNSIGNED_CHAR 36 #define HAVE_UNSIGNED_SHORT 37 38 /* Define "void" as "char" if your compiler doesn't know about type void. 39 * NOTE: be sure to define void such that "void *" represents the most general 40 * pointer type, e.g., that returned by malloc(). 41 */ 42 /* #define void char */ 43 44 /* Define "const" as empty if your compiler doesn't know the "const" keyword. 45 */ 46 /* #define const */ 47 48 /* Define this if an ordinary "char" type is unsigned. 49 * If you're not sure, leaving it undefined will work at some cost in speed. 50 * If you defined HAVE_UNSIGNED_CHAR then the speed difference is minimal. 51 */ 52 #undef CHAR_IS_UNSIGNED 53 54 /* Define this if your system has an ANSI-conforming <stddef.h> file. 55 */ 56 #define HAVE_STDDEF_H 57 58 /* Define this if your system has an ANSI-conforming <stdlib.h> file. 59 */ 60 #define HAVE_STDLIB_H 61 62 /* Define this if your system does not have an ANSI/SysV <string.h>, 63 * but does have a BSD-style <strings.h>. 64 */ 65 #undef NEED_BSD_STRINGS 66 67 /* Define this if your system does not provide typedef size_t in any of the 68 * ANSI-standard places (stddef.h, stdlib.h, or stdio.h), but places it in 69 * <sys/types.h> instead. 70 */ 71 #undef NEED_SYS_TYPES_H 72 73 /* For 80x86 machines, you need to define NEED_FAR_POINTERS, 74 * unless you are using a large-data memory model or 80386 flat-memory mode. 75 * On less brain-damaged CPUs this symbol must not be defined. 76 * (Defining this symbol causes large data structures to be referenced through 77 * "far" pointers and to be allocated with a special version of malloc.) 78 */ 79 #undef NEED_FAR_POINTERS 80 81 /* Define this if your linker needs global names to be unique in less 82 * than the first 15 characters. 83 */ 84 #undef NEED_SHORT_EXTERNAL_NAMES 85 86 /* Although a real ANSI C compiler can deal perfectly well with pointers to 87 * unspecified structures (see "incomplete types" in the spec), a few pre-ANSI 88 * and pseudo-ANSI compilers get confused. To keep one of these bozos happy, 89 * define INCOMPLETE_TYPES_BROKEN. This is not recommended unless you 90 * actually get "missing structure definition" warnings or errors while 91 * compiling the JPEG code. 92 */ 93 #undef INCOMPLETE_TYPES_BROKEN 94 95 /* Define "boolean" as unsigned char, not int, per Windows custom */ 96 #ifndef __RPCNDR_H__ /* don't conflict if rpcndr.h already read */ 97 typedef unsigned char boolean; 98 #endif 99 #define HAVE_BOOLEAN /* prevent jmorecfg.h from redefining it */ 100 101 /* 102 * The following options affect code selection within the JPEG library, 103 * but they don't need to be visible to applications using the library. 104 * To minimize application namespace pollution, the symbols won't be 105 * defined unless JPEG_INTERNALS has been defined. 106 */ 107 108 #ifdef JPEG_INTERNALS 109 110 /* Define this if your compiler implements ">>" on signed values as a logical 111 * (unsigned) shift; leave it undefined if ">>" is a signed (arithmetic) shift, 112 * which is the normal and rational definition. 113 */ 114 #undef RIGHT_SHIFT_IS_UNSIGNED 115 116 117 #endif /* JPEG_INTERNALS */ 118 119 120 /* 121 * The remaining options do not affect the JPEG library proper, 122 * but only the sample applications cjpeg/djpeg (see cjpeg.c, djpeg.c). 123 * Other applications can ignore these. 124 */ 125 126 #ifdef JPEG_CJPEG_DJPEG 127 128 /* These defines indicate which image (non-JPEG) file formats are allowed. */ 129 130 #define BMP_SUPPORTED /* BMP image file format */ 131 #define GIF_SUPPORTED /* GIF image file format */ 132 #define PPM_SUPPORTED /* PBMPLUS PPM/PGM image file format */ 133 #undef RLE_SUPPORTED /* Utah RLE image file format */ 134 #define TARGA_SUPPORTED /* Targa image file format */ 135 136 /* Define this if you want to name both input and output files on the command 137 * line, rather than using stdout and optionally stdin. You MUST do this if 138 * your system can't cope with binary I/O to stdin/stdout. See comments at 139 * head of cjpeg.c or djpeg.c. 140 */ 141 #undef TWO_FILE_COMMANDLINE 142 143 /* Define this if your system needs explicit cleanup of temporary files. 144 * This is crucial under MS-DOS, where the temporary "files" may be areas 145 * of extended memory; on most other systems it's not as important. 146 */ 147 #undef NEED_SIGNAL_CATCHER 148 149 /* By default, we open image files with fopen(...,"rb") or fopen(...,"wb"). 150 * This is necessary on systems that distinguish text files from binary files, 151 * and is harmless on most systems that don't. If you have one of the rare 152 * systems that complains about the "b" spec, define this symbol. 153 */ 154 #undef DONT_USE_B_MODE 155 156 /* Define this if you want percent-done progress reports from cjpeg/djpeg. 157 */ 158 #undef PROGRESS_REPORT 159 160 161 #endif /* JPEG_CJPEG_DJPEG */ 162