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| 6417 | ashmew2 | 1 | /* |
| 2 | * jconfig.doc |
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| 3 | * |
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| 4 | * Copyright (C) 1991-1994, Thomas G. Lane. |
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| 5 | * This file is part of the Independent JPEG Group's software. |
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| 6 | * For conditions of distribution and use, see the accompanying README file. |
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| 7 | * |
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| 8 | * This file documents the configuration options that are required to |
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| 9 | * customize the JPEG software for a particular system. |
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| 10 | * |
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| 11 | * The actual configuration options for a particular installation are stored |
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| 12 | * in jconfig.h. On many machines, jconfig.h can be generated automatically |
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| 13 | * or copied from one of the "canned" jconfig files that we supply. But if |
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| 14 | * you need to generate a jconfig.h file by hand, this file tells you how. |
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| 15 | * |
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| 16 | * DO NOT EDIT THIS FILE --- IT WON'T ACCOMPLISH ANYTHING. |
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| 17 | * EDIT A COPY NAMED JCONFIG.H. |
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| 18 | */ |
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| 19 | |||
| 20 | |||
| 21 | /* |
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| 22 | * These symbols indicate the properties of your machine or compiler. |
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| 23 | * #define the symbol if yes, #undef it if no. |
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| 24 | */ |
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| 25 | |||
| 26 | /* Does your compiler support function prototypes? |
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| 27 | * (If not, you also need to use ansi2knr, see install.doc) |
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| 28 | */ |
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| 29 | #define HAVE_PROTOTYPES |
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| 30 | |||
| 31 | /* Does your compiler support the declaration "unsigned char" ? |
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| 32 | * How about "unsigned short" ? |
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| 33 | */ |
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| 34 | #define HAVE_UNSIGNED_CHAR |
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| 35 | #define HAVE_UNSIGNED_SHORT |
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| 36 | |||
| 37 | /* Define "void" as "char" if your compiler doesn't know about type void. |
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| 38 | * NOTE: be sure to define void such that "void *" represents the most general |
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| 39 | * pointer type, e.g., that returned by malloc(). |
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| 40 | */ |
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| 41 | /* #define void char */ |
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| 42 | |||
| 43 | /* Define "const" as empty if your compiler doesn't know the "const" keyword. |
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| 44 | */ |
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| 45 | /* #define const */ |
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| 46 | |||
| 47 | /* Define this if an ordinary "char" type is unsigned. |
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| 48 | * If you're not sure, leaving it undefined will work at some cost in speed. |
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| 49 | * If you defined HAVE_UNSIGNED_CHAR then the speed difference is minimal. |
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| 50 | */ |
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| 51 | #undef CHAR_IS_UNSIGNED |
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| 52 | |||
| 53 | /* Define this if your system has an ANSI-conforming |
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| 54 | */ |
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| 55 | #define HAVE_STDDEF_H |
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| 56 | |||
| 57 | /* Define this if your system has an ANSI-conforming |
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| 58 | */ |
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| 59 | #define HAVE_STDLIB_H |
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| 60 | |||
| 61 | /* Define this if your system does not have an ANSI/SysV |
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| 62 | * but does have a BSD-style |
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| 63 | */ |
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| 64 | #undef NEED_BSD_STRINGS |
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| 65 | |||
| 66 | /* Define this if your system does not provide typedef size_t in any of the |
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| 67 | * ANSI-standard places (stddef.h, stdlib.h, or stdio.h), but places it in |
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| 68 | * |
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| 69 | */ |
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| 70 | #undef NEED_SYS_TYPES_H |
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| 71 | |||
| 72 | /* For 80x86 machines, you need to define NEED_FAR_POINTERS, |
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| 73 | * unless you are using a large-data memory model or 80386 flat-memory mode. |
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| 74 | * On less brain-damaged CPUs this symbol must not be defined. |
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| 75 | * (Defining this symbol causes large data structures to be referenced through |
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| 76 | * "far" pointers and to be allocated with a special version of malloc.) |
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| 77 | */ |
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| 78 | #undef NEED_FAR_POINTERS |
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| 79 | |||
| 80 | /* Define this if your linker needs global names to be unique in less |
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| 81 | * than the first 15 characters. |
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| 82 | */ |
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| 83 | #undef NEED_SHORT_EXTERNAL_NAMES |
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| 84 | |||
| 85 | /* Although a real ANSI C compiler can deal perfectly well with pointers to |
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| 86 | * unspecified structures (see "incomplete types" in the spec), a few pre-ANSI |
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| 87 | * and pseudo-ANSI compilers get confused. To keep one of these bozos happy, |
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| 88 | * define INCOMPLETE_TYPES_BROKEN. This is not recommended unless you |
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| 89 | * actually get "missing structure definition" warnings or errors while |
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| 90 | * compiling the JPEG code. |
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| 91 | */ |
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| 92 | #undef INCOMPLETE_TYPES_BROKEN |
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| 93 | |||
| 94 | |||
| 95 | /* |
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| 96 | * The following options affect code selection within the JPEG library, |
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| 97 | * but they don't need to be visible to applications using the library. |
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| 98 | * To minimize application namespace pollution, the symbols won't be |
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| 99 | * defined unless JPEG_INTERNALS has been defined. |
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| 100 | */ |
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| 101 | |||
| 102 | #ifdef JPEG_INTERNALS |
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| 103 | |||
| 104 | /* Define this if your compiler implements ">>" on signed values as a logical |
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| 105 | * (unsigned) shift; leave it undefined if ">>" is a signed (arithmetic) shift, |
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| 106 | * which is the normal and rational definition. |
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| 107 | */ |
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| 108 | #undef RIGHT_SHIFT_IS_UNSIGNED |
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| 109 | |||
| 110 | |||
| 111 | #endif /* JPEG_INTERNALS */ |
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| 112 | |||
| 113 | |||
| 114 | /* |
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| 115 | * The remaining options do not affect the JPEG library proper, |
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| 116 | * but only the sample applications cjpeg/djpeg (see cjpeg.c, djpeg.c). |
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| 117 | * Other applications can ignore these. |
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| 118 | */ |
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| 119 | |||
| 120 | #ifdef JPEG_CJPEG_DJPEG |
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| 121 | |||
| 122 | /* These defines indicate which image (non-JPEG) file formats are allowed. */ |
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| 123 | |||
| 124 | #define BMP_SUPPORTED /* BMP image file format */ |
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| 125 | #define GIF_SUPPORTED /* GIF image file format */ |
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| 126 | #define PPM_SUPPORTED /* PBMPLUS PPM/PGM image file format */ |
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| 127 | #undef RLE_SUPPORTED /* Utah RLE image file format */ |
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| 128 | #define TARGA_SUPPORTED /* Targa image file format */ |
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| 129 | |||
| 130 | /* Define this if you want to name both input and output files on the command |
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| 131 | * line, rather than using stdout and optionally stdin. You MUST do this if |
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| 132 | * your system can't cope with binary I/O to stdin/stdout. See comments at |
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| 133 | * head of cjpeg.c or djpeg.c. |
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| 134 | */ |
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| 135 | #undef TWO_FILE_COMMANDLINE |
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| 136 | |||
| 137 | /* Define this if your system needs explicit cleanup of temporary files. |
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| 138 | * This is crucial under MS-DOS, where the temporary "files" may be areas |
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| 139 | * of extended memory; on most other systems it's not as important. |
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| 140 | */ |
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| 141 | #undef NEED_SIGNAL_CATCHER |
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| 142 | |||
| 143 | /* By default, we open image files with fopen(...,"rb") or fopen(...,"wb"). |
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| 144 | * This is necessary on systems that distinguish text files from binary files, |
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| 145 | * and is harmless on most systems that don't. If you have one of the rare |
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| 146 | * systems that complains about the "b" spec, define this symbol. |
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| 147 | */ |
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| 148 | #undef DONT_USE_B_MODE |
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| 149 | |||
| 150 | /* Define this if you want percent-done progress reports from cjpeg/djpeg. |
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| 151 | */ |
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| 152 | #undef PROGRESS_REPORT |
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| 153 | |||
| 154 | |||
| 155 | #endif /* JPEG_CJPEG_DJPEG */ |