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| 1 README for libpng version 1.6.3 - July 18, 2013 (shared library 16.0) | 1 README for libpng version 1.2.45 - July 7, 2011 (shared library 12.0) |
| 2 See the note about version numbers near the top of png.h | 2 See the note about version numbers near the top of png.h |
| 3 | 3 |
| 4 See INSTALL for instructions on how to install libpng. | 4 See INSTALL for instructions on how to install libpng. |
| 5 | 5 |
| 6 Libpng comes in several distribution formats. Get libpng-*.tar.gz or | 6 Libpng comes in several distribution formats. Get libpng-*.tar.gz, |
| 7 libpng-*.tar.xz or if you want UNIX-style line endings in the text files, | 7 libpng-*.tar.xz, or libpng-*.tar.bz2 if you want UNIX-style line |
| 8 or lpng*.7z or lpng*.zip if you want DOS-style line endings. | 8 endings in the text files, or lpng*.7z or lpng*.zip if you want DOS-style |
| 9 line endings. You can get UNIX-style line endings from the *.zip file |
| 10 by using "unzip -a" but there seems to be no simple way to recover |
| 11 UNIX-style line endings from the *.7z file. The *.tar.xz file is |
| 12 recommended for *NIX users instead. |
| 9 | 13 |
| 10 Version 0.89 was the first official release of libpng. Don't let the | 14 Version 0.89 was the first official release of libpng. Don't let the |
| 11 fact that it's the first release fool you. The libpng library has been in | 15 fact that it's the first release fool you. The libpng library has been in |
| 12 extensive use and testing since mid-1995. By late 1997 it had | 16 extensive use and testing since mid-1995. By late 1997 it had |
| 13 finally gotten to the stage where there hadn't been significant | 17 finally gotten to the stage where there hadn't been significant |
| 14 changes to the API in some time, and people have a bad feeling about | 18 changes to the API in some time, and people have a bad feeling about |
| 15 libraries with versions < 1.0. Version 1.0.0 was released in | 19 libraries with versions < 1.0. Version 1.0.0 was released in |
| 16 March 1998. | 20 March 1998. |
| 17 | 21 |
| 18 **** | 22 **** |
| (...skipping 28 matching lines...) Expand all Loading... |
| 47 | 51 |
| 48 The additions since 0.89 include the ability to read from a PNG stream | 52 The additions since 0.89 include the ability to read from a PNG stream |
| 49 which has had some (or all) of the signature bytes read by the calling | 53 which has had some (or all) of the signature bytes read by the calling |
| 50 application. This also allows the reading of embedded PNG streams that | 54 application. This also allows the reading of embedded PNG streams that |
| 51 do not have the PNG file signature. As well, it is now possible to set | 55 do not have the PNG file signature. As well, it is now possible to set |
| 52 the library action on the detection of chunk CRC errors. It is possible | 56 the library action on the detection of chunk CRC errors. It is possible |
| 53 to set different actions based on whether the CRC error occurred in a | 57 to set different actions based on whether the CRC error occurred in a |
| 54 critical or an ancillary chunk. | 58 critical or an ancillary chunk. |
| 55 | 59 |
| 56 The changes made to the library, and bugs fixed are based on discussions | 60 The changes made to the library, and bugs fixed are based on discussions |
| 57 on the PNG-implement mailing list and not on material submitted | 61 on the png-mng-implement mailing list and not on material submitted |
| 58 privately to Guy, Andreas, or Glenn. They will forward any good | 62 privately to Guy, Andreas, or Glenn. They will forward any good |
| 59 suggestions to the list. | 63 suggestions to the list. |
| 60 | 64 |
| 61 For a detailed description on using libpng, read libpng-manual.txt. For | 65 For a detailed description on using libpng, read libpng.txt. For |
| 62 examples of libpng in a program, see example.c and pngtest.c. For usage | 66 examples of libpng in a program, see example.c and pngtest.c. For usage |
| 63 information and restrictions (what little they are) on libpng, see | 67 information and restrictions (what little they are) on libpng, see |
| 64 png.h. For a description on using zlib (the compression library used by | 68 png.h. For a description on using zlib (the compression library used by |
| 65 libpng) and zlib's restrictions, see zlib.h | 69 libpng) and zlib's restrictions, see zlib.h |
| 66 | 70 |
| 67 I have included a general makefile, as well as several machine and | 71 I have included a general makefile, as well as several machine and |
| 68 compiler specific ones, but you may have to modify one for your own needs. | 72 compiler specific ones, but you may have to modify one for your own needs. |
| 69 | 73 |
| 70 You should use zlib 1.0.4 or later to run this, but it MAY work with | 74 You should use zlib 1.0.4 or later to run this, but it MAY work with |
| 71 versions as old as zlib 0.95. Even so, there are bugs in older zlib | 75 versions as old as zlib 0.95. Even so, there are bugs in older zlib |
| 72 versions which can cause the output of invalid compression streams for | 76 versions which can cause the output of invalid compression streams for |
| 73 some images. You will definitely need zlib 1.0.4 or later if you are | 77 some images. You will definitely need zlib 1.0.4 or later if you are |
| 74 taking advantage of the MS-DOS "far" structure allocation for the small | 78 taking advantage of the MS-DOS "far" structure allocation for the small |
| 75 and medium memory models. You should also note that zlib is a | 79 and medium memory models. You should also note that zlib is a |
| 76 compression library that is useful for more things than just PNG files. | 80 compression library that is useful for more things than just PNG files. |
| 77 You can use zlib as a drop-in replacement for fread() and fwrite() if | 81 You can use zlib as a drop-in replacement for fread() and fwrite() if |
| 78 you are so inclined. | 82 you are so inclined. |
| 79 | 83 |
| 80 zlib should be available at the same place that libpng is, or at zlib.net. | 84 zlib should be available at the same place that libpng is, or at |
| 85 ftp://ftp.simplesystems.org/pub/png/src/ |
| 81 | 86 |
| 82 You may also want a copy of the PNG specification. It is available | 87 You may also want a copy of the PNG specification. It is available |
| 83 as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find | 88 as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find |
| 84 these at http://www.libpng.org/pub/png/documents/ | 89 these at http://www.libpng.org/pub/png/pngdocs.html |
| 85 | 90 |
| 86 This code is currently being archived at libpng.sf.net in the | 91 This code is currently being archived at libpng.sf.net in the |
| 87 [DOWNLOAD] area, and at ftp://ftp.simplesystems.org. If you can't find it | 92 [DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT) |
| 88 in any of those places, e-mail me, and I'll help you find it. | 93 at GO GRAPHSUP. If you can't find it in any of those places, |
| 94 e-mail me, and I'll help you find it. |
| 89 | 95 |
| 90 If you have any code changes, requests, problems, etc., please e-mail | 96 If you have any code changes, requests, problems, etc., please e-mail |
| 91 them to me. Also, I'd appreciate any make files or project files, | 97 them to me. Also, I'd appreciate any make files or project files, |
| 92 and any modifications you needed to make to get libpng to compile, | 98 and any modifications you needed to make to get libpng to compile, |
| 93 along with a #define variable to tell what compiler/system you are on. | 99 along with a #define variable to tell what compiler/system you are on. |
| 94 If you needed to add transformations to libpng, or wish libpng would | 100 If you needed to add transformations to libpng, or wish libpng would |
| 95 provide the image in a different way, drop me a note (and code, if | 101 provide the image in a different way, drop me a note (and code, if |
| 96 possible), so I can consider supporting the transformation. | 102 possible), so I can consider supporting the transformation. |
| 97 Finally, if you get any warning messages when compiling libpng | 103 Finally, if you get any warning messages when compiling libpng |
| 98 (note: not zlib), and they are easy to fix, I'd appreciate the | 104 (note: not zlib), and they are easy to fix, I'd appreciate the |
| 99 fix. Please mention "libpng" somewhere in the subject line. Thanks. | 105 fix. Please mention "libpng" somewhere in the subject line. Thanks. |
| 100 | 106 |
| 101 This release was created and will be supported by myself (of course | 107 This release was created and will be supported by myself (of course |
| 102 based in a large way on Guy's and Andreas' earlier work), and the PNG | 108 based in a large way on Guy's and Andreas' earlier work), and the PNG |
| 103 development group. | 109 development group. |
| 104 | 110 |
| 105 Send comments/corrections/commendations to png-mng-implement at | 111 Send comments/corrections/commendations to png-mng-implement at lists.sf.net |
| 106 lists.sourceforge.net (subscription required; visit | 112 (subscription required; visit |
| 107 https://lists.sourceforge.net/lists/listinfo/png-mng-implement | 113 https://lists.sourceforge.net/lists/listinfo/png-mng-implement |
| 108 to subscribe) or to glennrp at users.sourceforge.net | 114 to subscribe) or to glennrp at users.sourceforge.net |
| 109 | 115 |
| 110 You can't reach Guy, the original libpng author, at the addresses | 116 You can't reach Guy, the original libpng author, at the addresses |
| 111 given in previous versions of this document. He and Andreas will | 117 given in previous versions of this document. He and Andreas will |
| 112 read mail addressed to the png-implement list, however. | 118 read mail addressed to the png-mng-implement list, however. |
| 113 | 119 |
| 114 Please do not send general questions about PNG. Send them to | 120 Please do not send general questions about PNG. Send them to |
| 115 png-mng-misc at lists.sf.net (subscription required; visit | 121 the (png-mng-misc at lists.sourceforge.net, subscription required, visit |
| 116 https://lists.sourceforge.net/lists/listinfo/png-mng-misc to | 122 https://lists.sourceforge.net/lists/listinfo/png-mng-misc to |
| 117 subscribe). If you have a question about something | 123 subscribe). On the other hand, please do not send libpng questions to |
| 124 that address, send them to me or to the png-mng-implement list. I'll |
| 125 get them in the end anyway. If you have a question about something |
| 118 in the PNG specification that is related to using libpng, send it | 126 in the PNG specification that is related to using libpng, send it |
| 119 to me. Send me any questions that start with "I was using libpng, | 127 to me. Send me any questions that start with "I was using libpng, |
| 120 and ...". If in doubt, send questions to me. I'll bounce them | 128 and ...". If in doubt, send questions to me. I'll bounce them |
| 121 to others, if necessary. | 129 to others, if necessary. |
| 122 | 130 |
| 123 Please do not send suggestions on how to change PNG. We have | 131 Please do not send suggestions on how to change PNG. We have |
| 124 been discussing PNG for eighteen years now, and it is official and | 132 been discussing PNG for twelve years now, and it is official and |
| 125 finished. If you have suggestions for libpng, however, I'll | 133 finished. If you have suggestions for libpng, however, I'll |
| 126 gladly listen. Even if your suggestion is not used immediately, | 134 gladly listen. Even if your suggestion is not used immediately, |
| 127 it may be used later. | 135 it may be used later. |
| 128 | 136 |
| 129 Files in this distribution: | 137 Files in this distribution: |
| 130 | 138 |
| 131 ANNOUNCE => Announcement of this version, with recent changes | 139 ANNOUNCE => Announcement of this version, with recent changes |
| 132 CHANGES => Description of changes between libpng versions | 140 CHANGES => Description of changes between libpng versions |
| 133 KNOWNBUG => List of known bugs and deficiencies | 141 KNOWNBUG => List of known bugs and deficiencies |
| 134 LICENSE => License to use and redistribute libpng | 142 LICENSE => License to use and redistribute libpng |
| 135 README => This file | 143 README => This file |
| 136 TODO => Things not implemented in the current library | 144 TODO => Things not implemented in the current library |
| 137 Y2KINFO => Statement of Y2K compliance | 145 Y2KINFO => Statement of Y2K compliance |
| 138 example.c => Example code for using libpng functions | 146 example.c => Example code for using libpng functions |
| 139 libpng.3 => manual page for libpng (includes libpng-manual.txt) | 147 libpng-*-*-diff.txt => Diff from previous release |
| 140 libpng-manual.txt => Description of libpng and its functions | 148 libpng.3 => manual page for libpng (includes libpng.txt) |
| 149 libpng.txt => Description of libpng and its functions |
| 141 libpngpf.3 => manual page for libpng's private functions | 150 libpngpf.3 => manual page for libpng's private functions |
| 142 png.5 => manual page for the PNG format | 151 png.5 => manual page for the PNG format |
| 143 png.c => Basic interface functions common to library | 152 png.c => Basic interface functions common to library |
| 144 png.h => Library function and interface declarations (public) | 153 png.h => Library function and interface declarations |
| 145 pngpriv.h => Library function and interface declarations (private) | 154 pngconf.h => System specific library configuration |
| 146 pngconf.h => System specific library configuration (public) | |
| 147 pngstruct.h => png_struct declaration (private) | |
| 148 pnginfo.h => png_info struct declaration (private) | |
| 149 pngdebug.h => debugging macros (private) | |
| 150 pngerror.c => Error/warning message I/O functions | 155 pngerror.c => Error/warning message I/O functions |
| 151 pngget.c => Functions for retrieving info from struct | 156 pngget.c => Functions for retrieving info from struct |
| 152 pngmem.c => Memory handling functions | 157 pngmem.c => Memory handling functions |
| 153 pngbar.png => PNG logo, 88x31 | 158 pngbar.png => PNG logo, 88x31 |
| 154 pngnow.png => PNG logo, 98x31 | 159 pngnow.png => PNG logo, 98x31 |
| 155 pngpread.c => Progressive reading functions | 160 pngpread.c => Progressive reading functions |
| 156 pngread.c => Read data/helper high-level functions | 161 pngread.c => Read data/helper high-level functions |
| 157 pngrio.c => Lowest-level data read I/O functions | 162 pngrio.c => Lowest-level data read I/O functions |
| 158 pngrtran.c => Read data transformation functions | 163 pngrtran.c => Read data transformation functions |
| 159 pngrutil.c => Read data utility functions | 164 pngrutil.c => Read data utility functions |
| 160 pngset.c => Functions for storing data into the info_struct | 165 pngset.c => Functions for storing data into the info_struct |
| 161 pngtest.c => Library test program | 166 pngtest.c => Library test program |
| 162 pngtest.png => Library test sample image | 167 pngtest.png => Library test sample image |
| 163 pngtrans.c => Common data transformation functions | 168 pngtrans.c => Common data transformation functions |
| 164 pngwio.c => Lowest-level write I/O functions | 169 pngwio.c => Lowest-level write I/O functions |
| 165 pngwrite.c => High-level write functions | 170 pngwrite.c => High-level write functions |
| 166 pngwtran.c => Write data transformations | 171 pngwtran.c => Write data transformations |
| 167 pngwutil.c => Write utility functions | 172 pngwutil.c => Write utility functions |
| 168 arm => Contains optimized code for the ARM platform | |
| 169 contrib => Contributions | 173 contrib => Contributions |
| 170 examples => Example programs | |
| 171 gregbook => source code for PNG reading and writing, from | 174 gregbook => source code for PNG reading and writing, from |
| 172 Greg Roelofs' "PNG: The Definitive Guide", | 175 Greg Roelofs' "PNG: The Definitive Guide", |
| 173 O'Reilly, 1999 | 176 O'Reilly, 1999 |
| 174 libtests => Test programs | 177 msvctest => Builds and runs pngtest using a MSVC workspace |
| 175 pngminim => Minimal decoder, encoder, and progressive decoder | 178 pngminim => Simple pnm2pngm and png2pnmm programs |
| 176 programs demonstrating use of pngusr.dfa | 179 pngminus => Simple pnm2png and png2pnm programs |
| 177 pngminus => Simple pnm2png and png2pnm programs | 180 pngsuite => Test images |
| 178 pngsuite => Test images | |
| 179 tools => Various tools | |
| 180 visupng => Contains a MSVC workspace for VisualPng | 181 visupng => Contains a MSVC workspace for VisualPng |
| 181 projects => Contains project files and workspaces for | 182 projects => Contains project files and workspaces for |
| 182 building a DLL | 183 building a DLL |
| 183 owatcom => Contains a WATCOM project for building libpng | 184 beos => Contains a Beos workspace for building libpng |
| 184 visualc71 => Contains a Microsoft Visual C++ (MSVC) | 185 c5builder => Contains a Borland workspace for building |
| 186 libpng and zlib |
| 187 netware.txt => Contains instructions for downloading a set |
| 188 of project files for building libpng and |
| 189 zlib on Netware. |
| 190 visualc6 => Contains a Microsoft Visual C++ (MSVC) |
| 185 workspace for building libpng and zlib | 191 workspace for building libpng and zlib |
| 186 vstudio => Contains a Microsoft Visual C++ (MSVC) | 192 wince.txt => Contains instructions for downloading a |
| 187 workspace for building libpng and zlib | 193 Microsoft Visual C++ (Windows CD Toolkit) |
| 194 workspace for building libpng and zlib on |
| 195 WindowsCE |
| 196 xcode => Contains xcode project files |
| 188 scripts => Directory containing scripts for building libpng: | 197 scripts => Directory containing scripts for building libpng: |
| 189 (see scripts/README.txt for the list of scripts) | 198 descrip.mms => VMS makefile for MMS or MMK |
| 199 makefile.std => Generic UNIX makefile (cc, creates static |
| 200 libpng.a) |
| 201 makefile.elf => Linux/ELF gcc makefile symbol versioning, |
| 202 creates libpng12.so.0.1.2.45) |
| 203 makefile.linux => Linux/ELF makefile (gcc, creates |
| 204 libpng12.so.0.1.2.45) |
| 205 makefile.gcmmx => Linux/ELF makefile (gcc, creates |
| 206 libpng12.so.0.1.2.45, previously |
| 207 used assembler code tuned for Intel MMX |
| 208 platform) |
| 209 makefile.gcc => Generic makefile (gcc, creates static |
| 210 libpng.a) |
| 211 makefile.knr => Archaic UNIX Makefile that converts files |
| 212 with ansi2knr (Requires ansi2knr.c from |
| 213 ftp://ftp.cs.wisc.edu/ghost) |
| 214 makefile.aix => AIX makefile |
| 215 makefile.cygwin => Cygwin/gcc makefile |
| 216 makefile.darwin => Darwin makefile |
| 217 makefile.dec => DEC Alpha UNIX makefile |
| 218 makefile.freebsd => FreeBSD makefile |
| 219 makefile.hpgcc => HPUX makefile using gcc |
| 220 makefile.hpux => HPUX (10.20 and 11.00) makefile |
| 221 makefile.hp64 => HPUX (10.20 and 11.00) makefile, 64 bit |
| 222 makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2 |
| 223 (static) |
| 224 makefile.intel => Intel C/C++ version 4.0 and later |
| 225 libpng.icc => Project file, IBM VisualAge/C++ 4.0 or later |
| 226 makefile.netbsd => NetBSD/cc makefile, makes libpng.so. |
| 227 makefile.ne12bsd => NetBSD/cc makefile, makes libpng12.so |
| 228 makefile.openbsd => OpenBSD makefile |
| 229 makefile.sgi => Silicon Graphics IRIX (cc, creates static lib) |
| 230 makefile.sggcc => Silicon Graphics |
| 231 (gcc, creates libpng12.so.0.1.2.45) |
| 232 makefile.sunos => Sun makefile |
| 233 makefile.solaris => Solaris 2.X makefile |
| 234 (gcc, creates libpng12.so.0.1.2.45) |
| 235 makefile.so9 => Solaris 9 makefile |
| 236 (gcc, creates libpng12.so.0.1.2.45) |
| 237 makefile.32sunu => Sun Ultra 32-bit makefile |
| 238 makefile.64sunu => Sun Ultra 64-bit makefile |
| 239 makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc |
| 240 makefile.mips => MIPS makefile |
| 241 makefile.acorn => Acorn makefile |
| 242 makefile.amiga => Amiga makefile |
| 243 smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC |
| 244 compiler (Requires SCOPTIONS, copied from |
| 245 scripts/SCOPTIONS.ppc) |
| 246 makefile.atari => Atari makefile |
| 247 makefile.beos => BEOS makefile for X86 |
| 248 makefile.bor => Borland makefile (uses bcc) |
| 249 makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode) |
| 250 makefile.tc3 => Turbo C 3.0 makefile |
| 251 makefile.dj2 => DJGPP 2 makefile |
| 252 makefile.msc => Microsoft C makefile |
| 253 makefile.vcawin32=> makefile for Microsoft Visual C++ 5.0 and |
| 254 later (previously used assembler code tuned |
| 255 for Intel MMX platform) |
| 256 makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and |
| 257 later (does not use assembler code) |
| 258 makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def) |
| 259 pngos2.def => OS/2 module definition file used by makefile.os2 |
| 260 makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model |
| 261 makevms.com => VMS build script |
| 262 SCOPTIONS.ppc => Used with smakefile.ppc |
| 190 | 263 |
| 191 Good luck, and happy coding. | 264 Good luck, and happy coding. |
| 192 | 265 |
| 193 -Glenn Randers-Pehrson (current maintainer, since 1998) | 266 -Glenn Randers-Pehrson (current maintainer, since 1998) |
| 194 Internet: glennrp at users.sourceforge.net | 267 Internet: glennrp at users.sourceforge.net |
| 195 | 268 |
| 196 -Andreas Eric Dilger (former maintainer, 1996-1997) | 269 -Andreas Eric Dilger (former maintainer, 1996-1997) |
| 197 Internet: adilger at enel.ucalgary.ca | 270 Internet: adilger at enel.ucalgary.ca |
| 198 Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/ | 271 Web: http://members.shaw.ca/adilger/ |
| 199 | 272 |
| 200 -Guy Eric Schalnat (original author and former maintainer, 1995-1996) | 273 -Guy Eric Schalnat (original author and former maintainer, 1995-1996) |
| 201 (formerly of Group 42, Inc) | 274 (formerly of Group 42, Inc) |
| 202 Internet: gschal at infinet.com | 275 Internet: gschal at infinet.com |
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