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