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README for libpng version 1.2.50 - July 10, 2012 (shared library 12.0)
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See the note about version numbers near the top of png.h
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See INSTALL for instructions on how to install libpng.
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Libpng comes in several distribution formats. Get libpng-*.tar.gz,
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libpng-*.tar.xz, or libpng-*.tar.bz2 if you want UNIX-style line
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endings in the text files, or lpng*.7z or lpng*.zip if you want DOS-style
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line endings. You can get UNIX-style line endings from the *.zip file
by using "unzip -a" but there seems to be no simple way to recover
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UNIX-style line endings from the *.7z file. The *.tar.xz file is
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recommended for *NIX users instead.
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Version 0.89 was the first official release of libpng. Don't let the
fact that it's the first release fool you. The libpng library has been in
extensive use and testing since mid-1995. By late 1997 it had
finally gotten to the stage where there hadn't been significant
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changes to the API in some time, and people have a bad feeling about
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libraries with versions < 1.0. Version 1.0.0 was released in
March 1998.
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****
Note that some of the changes to the png_info structure render this
version of the library binary incompatible with libpng-0.89 or
earlier versions if you are using a shared library. The type of the
"filler" parameter for png_set_filler() has changed from png_byte to
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png_uint_32, which will affect shared-library applications that use
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this function.
To avoid problems with changes to the internals of png_info_struct,
new APIs have been made available in 0.95 to avoid direct application
access to info_ptr. These functions are the png_set_<chunk> and
png_get_<chunk> functions. These functions should be used when
accessing/storing the info_struct data, rather than manipulating it
directly, to avoid such problems in the future.
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It is important to note that the APIs do not make current programs
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that access the info struct directly incompatible with the new
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library. However, it is strongly suggested that new programs use
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the new APIs (as shown in example.c and pngtest.c), and older programs
be converted to the new format, to facilitate upgrades in the future.
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****
Additions since 0.90 include the ability to compile libpng as a
Windows DLL, and new APIs for accessing data in the info struct.
Experimental functions include the ability to set weighting and cost
factors for row filter selection, direct reads of integers from buffers
on big-endian processors that support misaligned data access, faster
methods of doing alpha composition, and more accurate 16->8 bit color
conversion.
The additions since 0.89 include the ability to read from a PNG stream
which has had some (or all) of the signature bytes read by the calling
application. This also allows the reading of embedded PNG streams that
do not have the PNG file signature. As well, it is now possible to set
the library action on the detection of chunk CRC errors. It is possible
to set different actions based on whether the CRC error occurred in a
critical or an ancillary chunk.
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The changes made to the library, and bugs fixed are based on discussions
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on the png-mng-implement mailing list and not on material submitted
privately to Guy, Andreas, or Glenn. They will forward any good
suggestions to the list.
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For a detailed description on using libpng, read libpng.txt. For
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examples of libpng in a program, see example.c and pngtest.c. For usage
information and restrictions (what little they are) on libpng, see
png.h. For a description on using zlib (the compression library used by
libpng) and zlib's restrictions, see zlib.h
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I have included a general makefile, as well as several machine and
compiler specific ones, but you may have to modify one for your own needs.
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You should use zlib 1.0.4 or later to run this, but it MAY work with
versions as old as zlib 0.95. Even so, there are bugs in older zlib
versions which can cause the output of invalid compression streams for
some images. You will definitely need zlib 1.0.4 or later if you are
taking advantage of the MS-DOS "far" structure allocation for the small
and medium memory models. You should also note that zlib is a
compression library that is useful for more things than just PNG files.
You can use zlib as a drop-in replacement for fread() and fwrite() if
you are so inclined.
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zlib should be available at the same place that libpng is, or at
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ftp://ftp.simplesystems.org/pub/png/src/
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You may also want a copy of the PNG specification. It is available
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as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find
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these at http://www.libpng.org/pub/png/pngdocs.html
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This code is currently being archived at libpng.sf.net in the
[DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT)
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at GO GRAPHSUP. If you can't find it in any of those places,
e-mail me, and I'll help you find it.
If you have any code changes, requests, problems, etc., please e-mail
them to me. Also, I'd appreciate any make files or project files,
and any modifications you needed to make to get libpng to compile,
along with a #define variable to tell what compiler/system you are on.
If you needed to add transformations to libpng, or wish libpng would
provide the image in a different way, drop me a note (and code, if
possible), so I can consider supporting the transformation.
Finally, if you get any warning messages when compiling libpng
(note: not zlib), and they are easy to fix, I'd appreciate the
fix. Please mention "libpng" somewhere in the subject line. Thanks.
This release was created and will be supported by myself (of course
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based in a large way on Guy's and Andreas' earlier work), and the PNG
development group.
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Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
to subscribe) or to glennrp at users.sourceforge.net
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You can't reach Guy, the original libpng author, at the addresses
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given in previous versions of this document. He and Andreas will
read mail addressed to the png-mng-implement list, however.
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Please do not send general questions about PNG. Send them to
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the (png-mng-misc at lists.sourceforge.net, subscription required, visit
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https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
subscribe). On the other hand, please do not send libpng questions to
that address, send them to me or to the png-mng-implement list. I'll
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get them in the end anyway. If you have a question about something
in the PNG specification that is related to using libpng, send it
to me. Send me any questions that start with "I was using libpng,
and ...". If in doubt, send questions to me. I'll bounce them
to others, if necessary.
Please do not send suggestions on how to change PNG. We have
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been discussing PNG for twelve years now, and it is official and
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finished. If you have suggestions for libpng, however, I'll
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gladly listen. Even if your suggestion is not used immediately,
it may be used later.
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Files in this distribution:
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ANNOUNCE => Announcement of this version, with recent changes
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CHANGES => Description of changes between libpng versions
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KNOWNBUG => List of known bugs and deficiencies
LICENSE => License to use and redistribute libpng
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README => This file
TODO => Things not implemented in the current library
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Y2KINFO => Statement of Y2K compliance
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example.c => Example code for using libpng functions
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libpng-*-*-diff.txt => Diff from previous release
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libpng.3 => manual page for libpng (includes libpng.txt)
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libpng.txt => Description of libpng and its functions
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libpngpf.3 => manual page for libpng's private functions
png.5 => manual page for the PNG format
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png.c => Basic interface functions common to library
png.h => Library function and interface declarations
pngconf.h => System specific library configuration
pngerror.c => Error/warning message I/O functions
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pngget.c => Functions for retrieving info from struct
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pngmem.c => Memory handling functions
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pngbar.png => PNG logo, 88x31
pngnow.png => PNG logo, 98x31
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pngpread.c => Progressive reading functions
pngread.c => Read data/helper high-level functions
pngrio.c => Lowest-level data read I/O functions
pngrtran.c => Read data transformation functions
pngrutil.c => Read data utility functions
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pngset.c => Functions for storing data into the info_struct
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pngtest.c => Library test program
pngtest.png => Library test sample image
pngtrans.c => Common data transformation functions
pngwio.c => Lowest-level write I/O functions
pngwrite.c => High-level write functions
pngwtran.c => Write data transformations
pngwutil.c => Write utility functions
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contrib => Contributions
gregbook => source code for PNG reading and writing, from
Greg Roelofs' "PNG: The Definitive Guide",
O'Reilly, 1999
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msvctest => Builds and runs pngtest using a MSVC workspace
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pngminim => Simple pnm2pngm and png2pnmm programs
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pngminus => Simple pnm2png and png2pnm programs
pngsuite => Test images
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visupng => Contains a MSVC workspace for VisualPng
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projects => Contains project files and workspaces for
building a DLL
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beos => Contains a Beos workspace for building libpng
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c5builder => Contains a Borland workspace for building
libpng and zlib
netware.txt => Contains instructions for downloading a set
of project files for building libpng and
zlib on Netware.
visualc6 => Contains a Microsoft Visual C++ (MSVC)
workspace for building libpng and zlib
wince.txt => Contains instructions for downloading a
Microsoft Visual C++ (Windows CD Toolkit)
workspace for building libpng and zlib on
WindowsCE
xcode => Contains xcode project files
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scripts => Directory containing scripts for building libpng:
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descrip.mms => VMS makefile for MMS or MMK
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makefile.std => Generic UNIX makefile (cc, creates static
libpng.a)
makefile.elf => Linux/ELF gcc makefile symbol versioning,
creates libpng12.so.0.1.2.50)
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makefile.linux => Linux/ELF makefile (gcc, creates
libpng12.so.0.1.2.50)
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makefile.gcmmx => Linux/ELF makefile (gcc, creates
libpng12.so.0.1.2.50, previously
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used assembler code tuned for Intel MMX
platform)
makefile.gcc => Generic makefile (gcc, creates static
libpng.a)
makefile.knr => Archaic UNIX Makefile that converts files
with ansi2knr (Requires ansi2knr.c from
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ftp://ftp.cs.wisc.edu/ghost)
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makefile.aix => AIX makefile
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makefile.cygwin => Cygwin/gcc makefile
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makefile.darwin => Darwin makefile
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makefile.dec => DEC Alpha UNIX makefile
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makefile.freebsd => FreeBSD makefile
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makefile.hpgcc => HPUX makefile using gcc
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makefile.hpux => HPUX (10.20 and 11.00) makefile
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makefile.hp64 => HPUX (10.20 and 11.00) makefile, 64 bit
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makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2
(static)
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makefile.intel => Intel C/C++ version 4.0 and later
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libpng.icc => Project file, IBM VisualAge/C++ 4.0 or later
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makefile.netbsd => NetBSD/cc makefile, makes libpng.so.
makefile.ne12bsd => NetBSD/cc makefile, makes libpng12.so
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makefile.openbsd => OpenBSD makefile
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makefile.sgi => Silicon Graphics IRIX (cc, creates static lib)
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makefile.sggcc => Silicon Graphics
(gcc, creates libpng12.so.0.1.2.50)
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makefile.sunos => Sun makefile
makefile.solaris => Solaris 2.X makefile
(gcc, creates libpng12.so.0.1.2.50)
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makefile.so9 => Solaris 9 makefile
(gcc, creates libpng12.so.0.1.2.50)
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makefile.32sunu => Sun Ultra 32-bit makefile
makefile.64sunu => Sun Ultra 64-bit makefile
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makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
makefile.mips => MIPS makefile
makefile.acorn => Acorn makefile
makefile.amiga => Amiga makefile
smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC
compiler (Requires SCOPTIONS, copied from
scripts/SCOPTIONS.ppc)
makefile.atari => Atari makefile
makefile.beos => BEOS makefile for X86
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makefile.bor => Borland makefile (uses bcc)
makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode)
makefile.tc3 => Turbo C 3.0 makefile
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makefile.dj2 => DJGPP 2 makefile
makefile.msc => Microsoft C makefile
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makefile.vcawin32=> makefile for Microsoft Visual C++ 5.0 and
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later (previously used assembler code tuned
for Intel MMX platform)
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makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and
later (does not use assembler code)
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makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
pngos2.def => OS/2 module definition file used by makefile.os2
makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model
makevms.com => VMS build script
SCOPTIONS.ppc => Used with smakefile.ppc
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Good luck, and happy coding.
-Glenn Randers-Pehrson (current maintainer, since 1998)
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Internet: glennrp at users.sourceforge.net
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-Andreas Eric Dilger (former maintainer, 1996-1997)
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Internet: adilger at enel.ucalgary.ca
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Web: http://members.shaw.ca/adilger/
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-Guy Eric Schalnat (original author and former maintainer, 1995-1996)
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(formerly of Group 42, Inc)
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Internet: gschal at infinet.com