Mercurial > fife-parpg
comparison ext/libpng-1.2.29/README @ 0:4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
author | mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222 |
---|---|
date | Sun, 29 Jun 2008 18:44:17 +0000 |
parents | |
children |
comparison
equal
deleted
inserted
replaced
-1:000000000000 | 0:4a0efb7baf70 |
---|---|
1 README for libpng version 1.2.29 - May 8, 2008 (shared library 12.0) | |
2 See the note about version numbers near the top of png.h | |
3 | |
4 See INSTALL for instructions on how to install libpng. | |
5 | |
6 Libpng comes in several distribution formats. Get libpng-*.tar.gz, | |
7 libpng-*.tar.lzma, or libpng-*.tar.bz2 if you want UNIX-style line | |
8 endings in the text files, or lpng*.7z or lpng*.zip if you want DOS-style | |
9 line endings. | |
10 | |
11 Version 0.89 was the first official release of libpng. Don't let the | |
12 fact that it's the first release fool you. The libpng library has been in | |
13 extensive use and testing since mid-1995. By late 1997 it had | |
14 finally gotten to the stage where there hadn't been significant | |
15 changes to the API in some time, and people have a bad feeling about | |
16 libraries with versions < 1.0. Version 1.0.0 was released in | |
17 March 1998. | |
18 | |
19 **** | |
20 Note that some of the changes to the png_info structure render this | |
21 version of the library binary incompatible with libpng-0.89 or | |
22 earlier versions if you are using a shared library. The type of the | |
23 "filler" parameter for png_set_filler() has changed from png_byte to | |
24 png_uint_32, which will affect shared-library applications that use | |
25 this function. | |
26 | |
27 To avoid problems with changes to the internals of png_info_struct, | |
28 new APIs have been made available in 0.95 to avoid direct application | |
29 access to info_ptr. These functions are the png_set_<chunk> and | |
30 png_get_<chunk> functions. These functions should be used when | |
31 accessing/storing the info_struct data, rather than manipulating it | |
32 directly, to avoid such problems in the future. | |
33 | |
34 It is important to note that the APIs do not make current programs | |
35 that access the info struct directly incompatible with the new | |
36 library. However, it is strongly suggested that new programs use | |
37 the new APIs (as shown in example.c and pngtest.c), and older programs | |
38 be converted to the new format, to facilitate upgrades in the future. | |
39 **** | |
40 | |
41 Additions since 0.90 include the ability to compile libpng as a | |
42 Windows DLL, and new APIs for accessing data in the info struct. | |
43 Experimental functions include the ability to set weighting and cost | |
44 factors for row filter selection, direct reads of integers from buffers | |
45 on big-endian processors that support misaligned data access, faster | |
46 methods of doing alpha composition, and more accurate 16->8 bit color | |
47 conversion. | |
48 | |
49 The additions since 0.89 include the ability to read from a PNG stream | |
50 which has had some (or all) of the signature bytes read by the calling | |
51 application. This also allows the reading of embedded PNG streams that | |
52 do not have the PNG file signature. As well, it is now possible to set | |
53 the library action on the detection of chunk CRC errors. It is possible | |
54 to set different actions based on whether the CRC error occurred in a | |
55 critical or an ancillary chunk. | |
56 | |
57 The changes made to the library, and bugs fixed are based on discussions | |
58 on the PNG-implement mailing list | |
59 and not on material submitted privately to Guy, Andreas, or Glenn. They will | |
60 forward any good suggestions to the list. | |
61 | |
62 For a detailed description on using libpng, read libpng.txt. For | |
63 examples of libpng in a program, see example.c and pngtest.c. For usage | |
64 information and restrictions (what little they are) on libpng, see | |
65 png.h. For a description on using zlib (the compression library used by | |
66 libpng) and zlib's restrictions, see zlib.h | |
67 | |
68 I have included a general makefile, as well as several machine and | |
69 compiler specific ones, but you may have to modify one for your own needs. | |
70 | |
71 You should use zlib 1.0.4 or later to run this, but it MAY work with | |
72 versions as old as zlib 0.95. Even so, there are bugs in older zlib | |
73 versions which can cause the output of invalid compression streams for | |
74 some images. You will definitely need zlib 1.0.4 or later if you are | |
75 taking advantage of the MS-DOS "far" structure allocation for the small | |
76 and medium memory models. You should also note that zlib is a | |
77 compression library that is useful for more things than just PNG files. | |
78 You can use zlib as a drop-in replacement for fread() and fwrite() if | |
79 you are so inclined. | |
80 | |
81 zlib should be available at the same place that libpng is, or at | |
82 ftp://ftp.simplesystems.org/pub/png/src/ | |
83 | |
84 You may also want a copy of the PNG specification. It is available | |
85 as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find | |
86 these at http://www.libpng.org/pub/png/pngdocs.html | |
87 | |
88 This code is currently being archived at libpng.sf.net in the | |
89 [DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT) | |
90 at GO GRAPHSUP. If you can't find it in any of those places, | |
91 e-mail me, and I'll help you find it. | |
92 | |
93 If you have any code changes, requests, problems, etc., please e-mail | |
94 them to me. Also, I'd appreciate any make files or project files, | |
95 and any modifications you needed to make to get libpng to compile, | |
96 along with a #define variable to tell what compiler/system you are on. | |
97 If you needed to add transformations to libpng, or wish libpng would | |
98 provide the image in a different way, drop me a note (and code, if | |
99 possible), so I can consider supporting the transformation. | |
100 Finally, if you get any warning messages when compiling libpng | |
101 (note: not zlib), and they are easy to fix, I'd appreciate the | |
102 fix. Please mention "libpng" somewhere in the subject line. Thanks. | |
103 | |
104 This release was created and will be supported by myself (of course | |
105 based in a large way on Guy's and Andreas' earlier work), and the PNG group. | |
106 | |
107 Send comments/corrections/commendations to png-mng-implement at lists.sf.net | |
108 (subscription required; visit | |
109 https://lists.sourceforge.net/lists/listinfo/png-mng-implement | |
110 to subscribe) or to glennrp at users.sourceforge.net | |
111 | |
112 You can't reach Guy, the original libpng author, at the addresses | |
113 given in previous versions of this document. He and Andreas will read mail | |
114 addressed to the png-implement list, however. | |
115 | |
116 Please do not send general questions about PNG. Send them to | |
117 the (png-mng-misc at lists.sourceforge.net, subscription required, visit | |
118 https://lists.sourceforge.net/lists/listinfo/png-mng-implement to subscribe) | |
119 On the other hand, | |
120 please do not send libpng questions to that address, send them to me | |
121 or to the png-implement list. I'll | |
122 get them in the end anyway. If you have a question about something | |
123 in the PNG specification that is related to using libpng, send it | |
124 to me. Send me any questions that start with "I was using libpng, | |
125 and ...". If in doubt, send questions to me. I'll bounce them | |
126 to others, if necessary. | |
127 | |
128 Please do not send suggestions on how to change PNG. We have | |
129 been discussing PNG for twelve years now, and it is official and | |
130 finished. If you have suggestions for libpng, however, I'll | |
131 gladly listen. Even if your suggestion is not used immediately, | |
132 it may be used later. | |
133 | |
134 Files in this distribution: | |
135 | |
136 ANNOUNCE => Announcement of this version, with recent changes | |
137 CHANGES => Description of changes between libpng versions | |
138 KNOWNBUG => List of known bugs and deficiencies | |
139 LICENSE => License to use and redistribute libpng | |
140 README => This file | |
141 TODO => Things not implemented in the current library | |
142 Y2KINFO => Statement of Y2K compliance | |
143 example.c => Example code for using libpng functions | |
144 libpng-*-*-diff.txt => Diff from previous release | |
145 libpng.3 => manual page for libpng (includes libpng.txt) | |
146 libpng.txt => Description of libpng and its functions | |
147 libpngpf.3 => manual page for libpng's private functions | |
148 png.5 => manual page for the PNG format | |
149 png.c => Basic interface functions common to library | |
150 png.h => Library function and interface declarations | |
151 pngconf.h => System specific library configuration | |
152 pngerror.c => Error/warning message I/O functions | |
153 pngget.c => Functions for retrieving info from struct | |
154 pngmem.c => Memory handling functions | |
155 pngbar.png => PNG logo, 88x31 | |
156 pngnow.png => PNG logo, 98x31 | |
157 pngpread.c => Progressive reading functions | |
158 pngread.c => Read data/helper high-level functions | |
159 pngrio.c => Lowest-level data read I/O functions | |
160 pngrtran.c => Read data transformation functions | |
161 pngrutil.c => Read data utility functions | |
162 pngset.c => Functions for storing data into the info_struct | |
163 pngtest.c => Library test program | |
164 pngtest.png => Library test sample image | |
165 pngtrans.c => Common data transformation functions | |
166 pngwio.c => Lowest-level write I/O functions | |
167 pngwrite.c => High-level write functions | |
168 pngwtran.c => Write data transformations | |
169 pngwutil.c => Write utility functions | |
170 contrib => Contributions | |
171 gregbook => source code for PNG reading and writing, from | |
172 Greg Roelofs' "PNG: The Definitive Guide", | |
173 O'Reilly, 1999 | |
174 msvctest => Builds and runs pngtest using a MSVC workspace | |
175 pngminus => Simple pnm2png and png2pnm programs | |
176 pngsuite => Test images | |
177 visupng => Contains a MSVC workspace for VisualPng | |
178 projects => Contains project files and workspaces for building DLL | |
179 beos => Contains a Beos workspace for building libpng | |
180 c5builder => Contains a Borland workspace for building libpng | |
181 and zlib | |
182 visualc6 => Contains a Microsoft Visual C++ (MSVC) workspace | |
183 for building libpng and zlib | |
184 netware.txt => Contains instructions for downloading a set of | |
185 project files for building libpng and zlib on | |
186 Netware. | |
187 wince.txt => Contains instructions for downloading a Microsoft | |
188 Visual C++ (Windows CD Toolkit) workspace for | |
189 building libpng and zlib on WindowsCE | |
190 scripts => Directory containing scripts for building libpng: | |
191 descrip.mms => VMS makefile for MMS or MMK | |
192 makefile.std => Generic UNIX makefile (cc, creates static libpng.a) | |
193 makefile.elf => Linux/ELF makefile symbol versioning, | |
194 gcc, creates libpng12.so.0.1.2.29) | |
195 makefile.linux => Linux/ELF makefile | |
196 (gcc, creates libpng12.so.0.1.2.29) | |
197 makefile.gcmmx => Linux/ELF makefile | |
198 (gcc, creates libpng12.so.0.1.2.29, | |
199 uses assembler code tuned for Intel MMX platform) | |
200 makefile.gcc => Generic makefile (gcc, creates static libpng.a) | |
201 makefile.knr => Archaic UNIX Makefile that converts files with | |
202 ansi2knr (Requires ansi2knr.c from | |
203 ftp://ftp.cs.wisc.edu/ghost) | |
204 makefile.aix => AIX makefile | |
205 makefile.cygwin => Cygwin/gcc makefile | |
206 makefile.darwin => Darwin makefile | |
207 makefile.dec => DEC Alpha UNIX makefile | |
208 makefile.freebsd => FreeBSD makefile | |
209 makefile.hpgcc => HPUX makefile using gcc | |
210 makefile.hpux => HPUX (10.20 and 11.00) makefile | |
211 makefile.hp64 => HPUX (10.20 and 11.00) makefile, 64 bit | |
212 makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2 (static) | |
213 makefile.intel => Intel C/C++ version 4.0 and later | |
214 libpng.icc => Project file, IBM VisualAge/C++ 4.0 or later | |
215 makefile.netbsd => NetBSD/cc makefile, PNGGCCRD, makes libpng.so. | |
216 makefile.ne12bsd => NetBSD/cc makefile, PNGGCCRD, makes libpng12.so | |
217 makefile.openbsd => OpenBSD makefile | |
218 makefile.sgi => Silicon Graphics IRIX (cc, creates static lib) | |
219 makefile.sggcc => Silicon Graphics | |
220 (gcc, creates libpng12.so.0.1.2.29) | |
221 makefile.sunos => Sun makefile | |
222 makefile.solaris => Solaris 2.X makefile | |
223 (gcc, creates libpng12.so.0.1.2.29) | |
224 makefile.so9 => Solaris 9 makefile | |
225 (gcc, creates libpng12.so.0.1.2.29) | |
226 makefile.32sunu => Sun Ultra 32-bit makefile | |
227 makefile.64sunu => Sun Ultra 64-bit makefile | |
228 makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc | |
229 makefile.mips => MIPS makefile | |
230 makefile.acorn => Acorn makefile | |
231 makefile.amiga => Amiga makefile | |
232 smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC | |
233 compiler (Requires SCOPTIONS, copied from | |
234 scripts/SCOPTIONS.ppc) | |
235 makefile.atari => Atari makefile | |
236 makefile.beos => BEOS makefile for X86 | |
237 makefile.bor => Borland makefile (uses bcc) | |
238 makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode) | |
239 makefile.tc3 => Turbo C 3.0 makefile | |
240 makefile.dj2 => DJGPP 2 makefile | |
241 makefile.msc => Microsoft C makefile | |
242 makefile.vcawin32=> makefile for Microsoft Visual C++ 5.0 and | |
243 later (uses assembler code tuned for Intel MMX | |
244 platform) | |
245 makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and | |
246 later (does not use assembler code) | |
247 makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def) | |
248 pngos2.def => OS/2 module definition file used by makefile.os2 | |
249 makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model | |
250 makevms.com => VMS build script | |
251 SCOPTIONS.ppc => Used with smakefile.ppc | |
252 | |
253 Good luck, and happy coding. | |
254 | |
255 -Glenn Randers-Pehrson (current maintainer) | |
256 Internet: glennrp at users.sourceforge.net | |
257 | |
258 -Andreas Eric Dilger (former maintainer, 1996-1997) | |
259 Internet: adilger at enel.ucalgary.ca | |
260 Web: http://members.shaw.ca/adilger/ | |
261 | |
262 -Guy Eric Schalnat (original author and former maintainer, 1995-1996) | |
263 (formerly of Group 42, Inc) | |
264 Internet: gschal at infinet.com |