Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/cdaltui.txt @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 IJG JPEG LIBRARY: ALTERNATE USER INTERFACE FOR CJPEG/DJPEG
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3 Copyright (C) 2020-2023, Guido Vollbeding.
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4 This file is part of the Independent JPEG Group's software.
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5 For conditions of distribution and use, see the accompanying README file.
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8 There is an alternate command-line user interface for the IJG JPEG software.
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9 It is designed for use under MS-DOS, and may also be useful on other non-Unix
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10 operating systems. (For that matter, this code works fine on Unix, but the
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11 standard command-line syntax is better on Unix because it is pipe-friendly.)
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13 With this user interface, cjpeg and djpeg accept multiple input file names
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14 on the command line; output file names are generated by substituting
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15 appropriate extensions. The user is prompted before any already-existing
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16 file will be overwritten.
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18 Expansion of wild-card file specifications is useful but is not directly
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19 provided by this code. Most DOS C compilers have the ability to do wild-card
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20 expansion "behind the scenes", and we rely on that feature. On other systems,
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21 the shell may do it for you, as is done on Unix.
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23 Also, a DOS-specific routine is provided to determine available memory;
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24 this makes the -maxmemory switch unnecessary except in unusual cases.
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25 If you know how to determine available memory on a different system,
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26 you can easily add the necessary code. (And please send it along
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27 to jpeg-info@ijg.org so we can include it in future releases!)
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30 INSTALLATION
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31 ============
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33 Rename the standard cjpeg.c file to cjpegstd.c, then rename cjpegalt.c to
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34 cjpeg.c.
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35 Rename the standard djpeg.c file to djpegstd.c, then rename djpegalt.c to
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36 djpeg.c.
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37 Then build the software as described in install.txt, with these exceptions:
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39 * Define PROGRESS_REPORT in jconfig.h if you want the percent-done display.
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40 * Define NO_OVERWRITE_CHECK if you *don't* want overwrite confirmation.
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41 * You may ignore the USE_SETMODE and TWO_FILE_COMMANDLINE symbols discussed
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42 in install.txt; these files do not use them.
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43 * As given, djpegalt.c defaults to BMP output (not PPM output as in the
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44 standard djpeg.c). If you want something different, modify DEFAULT_FMT.
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46 You may also need to do something special to enable filename wild-card
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47 expansion, assuming your compiler has that capability at all.
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49 Modify the standard usage.txt file as described below. (If you want to use
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50 the Unix-style manual pages cjpeg.1 and djpeg.1, better fix them too.)
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52 To restore the standard user interface:
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53 Rename cjpeg.c to cjpegalt.c, then rename cjpegstd.c to cjpeg.c.
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54 Rename djpeg.c to djpegalt.c, then rename djpegstd.c to djpeg.c.
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55 Then recompile/rebuild.
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57
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58 Here are some specific notes for popular MS-DOS compilers:
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60 Borland C:
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61 Add "-DMSDOS" to CFLAGS to enable use of the DOS memory determination code.
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62 Link with the standard library file WILDARGS.OBJ to get wild-card expansion.
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64 Microsoft C:
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65 Add "-DMSDOS" to CFLAGS to enable use of the DOS memory determination code.
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66 Link with the standard library file SETARGV.OBJ to get wild-card expansion.
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67 In the versions I've used, you must also add /NOE to the linker switches to
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68 avoid a duplicate-symbol error from including SETARGV.
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70 DJGPP (we recommend version 2.0 or later):
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71 Add "-DFREE_MEM_ESTIMATE=0" to CFLAGS. Wild-card expansion is automatic.
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74 USAGE
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75 =====
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76
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77 Most of the standard usage.txt file also applies to the alternate version,
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78 but replace its "GENERAL USAGE" section with the text below. Edit the text
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79 as necessary if you don't support wildcards or overwrite checking. Be sure
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80 to fix the djpeg switch descriptions if you are not defaulting to PPM output.
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81 Also, if you've provided an accurate memory-estimation procedure, you can
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82 probably eliminate the HINTS related to the -maxmemory switch.
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83
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85 GENERAL USAGE
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86
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87 We provide two programs, cjpeg to compress an image file into JPEG format,
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88 and djpeg to decompress a JPEG file back into a conventional image format.
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89
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90 The basic command line is:
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91 cjpeg [switches] list of image files
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92 or
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93 djpeg [switches] list of jpeg files
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95 Each file named is compressed or decompressed. The input file(s) are not
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96 modified; the output data is written to files which have the same names
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97 except for extension. cjpeg always uses ".jpg" for the output file name's
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98 extension; djpeg uses one of ".bmp", ".gif", ".ppm", ".rle", or ".tga",
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99 depending on what output format is selected by the switches.
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100
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101 For example, to convert xxx.bmp to xxx.jpg and yyy.ppm to yyy.jpg, say:
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102 cjpeg xxx.bmp yyy.ppm
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103
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104 On most systems you can use standard wildcards to specify the list of input
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105 files; for example, on DOS "djpeg *.jpg" decompresses all the JPEG files in
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106 the current directory.
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107
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108 If an intended output file already exists, you'll be asked whether or not to
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109 overwrite it. If you say no, the program skips that input file and goes on
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110 to the next one.
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111
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112 You can intermix switches and file names; for example
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113 djpeg -gif file1.jpg -targa file2.jpg
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114 decompresses file1.jpg into GIF format (file1.gif) and file2.jpg into Targa
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115 format (file2.tga). Only switches to the left of a given file name affect
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116 processing of that file; when there are conflicting switches, the rightmost
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117 one takes precedence.
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118
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119 You can override the program's choice of output file name by using the
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120 -outfile switch, as in
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121 cjpeg -outfile output.jpg input.ppm
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122 -outfile only affects the first input file name to its right.
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123
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124 The currently supported image file formats are: PPM (PBMPLUS color format),
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125 PGM (PBMPLUS grayscale format), BMP, GIF, Targa, and RLE (Utah Raster Toolkit
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126 format). (RLE is supported only if the URT library is available, which it
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127 isn't on most non-Unix systems.) cjpeg recognizes the input image format
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128 automatically, with the exception of some Targa-format files. You have to
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129 tell djpeg which format to generate.
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130
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131 JPEG files are in the standard JFIF file format. There are other,
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132 less widely used JPEG-based file formats, but we don't support them.
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133
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134 All switch names may be abbreviated; for example, -grayscale may be written
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135 -gray or -gr. Most of the "basic" switches can be abbreviated to as little as
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136 one letter. Upper and lower case are equivalent (-BMP is the same as -bmp).
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137 British spellings are also accepted (e.g., -greyscale), though for brevity
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138 these are not mentioned below.