1 /* 2 * jconfig.txt 3 * 4 * This file was part of the Independent JPEG Group's software: 5 * Copyright (C) 1991-1994, Thomas G. Lane. 6 * It was modified by The libjpeg-turbo Project to include only code relevant 7 * to libjpeg-turbo. 8 * For conditions of distribution and use, see the accompanying README file. 9 * 10 * This file documents the configuration options that are required to 11 * customize the JPEG software for a particular system. 12 * 13 * The actual configuration options for a particular installation are stored 14 * in jconfig.h. On many machines, jconfig.h can be generated automatically 15 * or copied from one of the "canned" jconfig files that we supply. But if 16 * you need to generate a jconfig.h file by hand, this file tells you how. 17 * 18 * DO NOT EDIT THIS FILE --- IT WON'T ACCOMPLISH ANYTHING. 19 * EDIT A COPY NAMED JCONFIG.H. 20 */ 21 22 23 /* 24 * These symbols indicate the properties of your machine or compiler. 25 * #define the symbol if yes, #undef it if no. 26 */ 27 28 /* Does your compiler support the declaration "unsigned char" ? 29 * How about "unsigned short" ? 30 */ 31 #define HAVE_UNSIGNED_CHAR 32 #define HAVE_UNSIGNED_SHORT 33 34 /* Define "void" as "char" if your compiler doesn't know about type void. 35 * NOTE: be sure to define void such that "void *" represents the most general 36 * pointer type, e.g., that returned by malloc(). 37 */ 38 /* #define void char */ 39 40 /* Define "const" as empty if your compiler doesn't know the "const" keyword. 41 */ 42 /* #define const */ 43 44 /* Define this if an ordinary "char" type is unsigned. 45 * If you're not sure, leaving it undefined will work at some cost in speed. 46 * If you defined HAVE_UNSIGNED_CHAR then the speed difference is minimal. 47 */ 48 #undef __CHAR_UNSIGNED__ 49 50 /* Define this if your system has an ANSI-conforming <stddef.h> file. 51 */ 52 #define HAVE_STDDEF_H 53 54 /* Define this if your system has an ANSI-conforming <stdlib.h> file. 55 */ 56 #define HAVE_STDLIB_H 57 58 /* Define this if your system does not have an ANSI/SysV <string.h>, 59 * but does have a BSD-style <strings.h>. 60 */ 61 #undef NEED_BSD_STRINGS 62 63 /* Define this if your system does not provide typedef size_t in any of the 64 * ANSI-standard places (stddef.h, stdlib.h, or stdio.h), but places it in 65 * <sys/types.h> instead. 66 */ 67 #undef NEED_SYS_TYPES_H 68 69 /* Although a real ANSI C compiler can deal perfectly well with pointers to 70 * unspecified structures (see "incomplete types" in the spec), a few pre-ANSI 71 * and pseudo-ANSI compilers get confused. To keep one of these bozos happy, 72 * define INCOMPLETE_TYPES_BROKEN. This is not recommended unless you 73 * actually get "missing structure definition" warnings or errors while 74 * compiling the JPEG code. 75 */ 76 #undef INCOMPLETE_TYPES_BROKEN 77 78 /* Define "boolean" as unsigned char, not int, on Windows systems. 79 */ 80 #ifdef _WIN32 81 #ifndef __RPCNDR_H__ /* don't conflict if rpcndr.h already read */ 82 typedef unsigned char boolean; 83 #endif 84 #define HAVE_BOOLEAN /* prevent jmorecfg.h from redefining it */ 85 #endif 86 87 88 /* 89 * The following options affect code selection within the JPEG library, 90 * but they don't need to be visible to applications using the library. 91 * To minimize application namespace pollution, the symbols won't be 92 * defined unless JPEG_INTERNALS has been defined. 93 */ 94 95 #ifdef JPEG_INTERNALS 96 97 /* Define this if your compiler implements ">>" on signed values as a logical 98 * (unsigned) shift; leave it undefined if ">>" is a signed (arithmetic) shift, 99 * which is the normal and rational definition. 100 */ 101 #undef RIGHT_SHIFT_IS_UNSIGNED 102 103 104 #endif /* JPEG_INTERNALS */ 105 106 107 /* 108 * The remaining options do not affect the JPEG library proper, 109 * but only the sample applications cjpeg/djpeg (see cjpeg.c, djpeg.c). 110 * Other applications can ignore these. 111 */ 112 113 #ifdef JPEG_CJPEG_DJPEG 114 115 /* These defines indicate which image (non-JPEG) file formats are allowed. */ 116 117 #define BMP_SUPPORTED /* BMP image file format */ 118 #define GIF_SUPPORTED /* GIF image file format */ 119 #define PPM_SUPPORTED /* PBMPLUS PPM/PGM image file format */ 120 #undef RLE_SUPPORTED /* Utah RLE image file format */ 121 #define TARGA_SUPPORTED /* Targa image file format */ 122 123 /* Define this if you want to name both input and output files on the command 124 * line, rather than using stdout and optionally stdin. You MUST do this if 125 * your system can't cope with binary I/O to stdin/stdout. See comments at 126 * head of cjpeg.c or djpeg.c. 127 */ 128 #undef TWO_FILE_COMMANDLINE 129 130 /* By default, we open image files with fopen(...,"rb") or fopen(...,"wb"). 131 * This is necessary on systems that distinguish text files from binary files, 132 * and is harmless on most systems that don't. If you have one of the rare 133 * systems that complains about the "b" spec, define this symbol. 134 */ 135 #undef DONT_USE_B_MODE 136 137 /* Define this if you want percent-done progress reports from cjpeg/djpeg. 138 */ 139 #undef PROGRESS_REPORT 140 141 142 #endif /* JPEG_CJPEG_DJPEG */ 143
