--- /dev/null
+README for libpng version 1.2.29 - May 8, 2008 (shared library 12.0)
+See the note about version numbers near the top of png.h
+
+See INSTALL for instructions on how to install libpng.
+
+Libpng comes in several distribution formats. Get libpng-*.tar.gz,
+libpng-*.tar.lzma, or libpng-*.tar.bz2 if you want UNIX-style line
+endings in the text files, or lpng*.7z or lpng*.zip if you want DOS-style
+line endings.
+
+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
+changes to the API in some time, and people have a bad feeling about
+libraries with versions < 1.0. Version 1.0.0 was released in
+March 1998.
+
+****
+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
+png_uint_32, which will affect shared-library applications that use
+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.
+
+It is important to note that the APIs do not make current programs
+that access the info struct directly incompatible with the new
+library. However, it is strongly suggested that new programs use
+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.
+****
+
+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.
+
+The changes made to the library, and bugs fixed are based on discussions
+on the PNG-implement mailing list
+and not on material submitted privately to Guy, Andreas, or Glenn. They will
+forward any good suggestions to the list.
+
+For a detailed description on using libpng, read libpng.txt. For
+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
+
+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.
+
+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.
+
+zlib should be available at the same place that libpng is, or at
+ftp://ftp.simplesystems.org/pub/png/src/
+
+You may also want a copy of the PNG specification. It is available
+as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find
+these at http://www.libpng.org/pub/png/pngdocs.html
+
+This code is currently being archived at libpng.sf.net in the
+[DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT)
+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
+based in a large way on Guy's and Andreas' earlier work), and the PNG group.
+
+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
+
+You can't reach Guy, the original libpng author, at the addresses
+given in previous versions of this document. He and Andreas will read mail
+addressed to the png-implement list, however.
+
+Please do not send general questions about PNG. Send them to
+the (png-mng-misc at lists.sourceforge.net, subscription required, visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement to subscribe)
+On the other hand,
+please do not send libpng questions to that address, send them to me
+or to the png-implement list. I'll
+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
+been discussing PNG for twelve years now, and it is official and
+finished. If you have suggestions for libpng, however, I'll
+gladly listen. Even if your suggestion is not used immediately,
+it may be used later.
+
+Files in this distribution:
+
+ ANNOUNCE => Announcement of this version, with recent changes
+ CHANGES => Description of changes between libpng versions
+ KNOWNBUG => List of known bugs and deficiencies
+ LICENSE => License to use and redistribute libpng
+ README => This file
+ TODO => Things not implemented in the current library
+ Y2KINFO => Statement of Y2K compliance
+ example.c => Example code for using libpng functions
+ libpng-*-*-diff.txt => Diff from previous release
+ libpng.3 => manual page for libpng (includes libpng.txt)
+ libpng.txt => Description of libpng and its functions
+ libpngpf.3 => manual page for libpng's private functions
+ png.5 => manual page for the PNG format
+ 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
+ pngget.c => Functions for retrieving info from struct
+ pngmem.c => Memory handling functions
+ pngbar.png => PNG logo, 88x31
+ pngnow.png => PNG logo, 98x31
+ 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
+ pngset.c => Functions for storing data into the info_struct
+ 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
+ contrib => Contributions
+ gregbook => source code for PNG reading and writing, from
+ Greg Roelofs' "PNG: The Definitive Guide",
+ O'Reilly, 1999
+ msvctest => Builds and runs pngtest using a MSVC workspace
+ pngminus => Simple pnm2png and png2pnm programs
+ pngsuite => Test images
+ visupng => Contains a MSVC workspace for VisualPng
+ projects => Contains project files and workspaces for building DLL
+ beos => Contains a Beos workspace for building libpng
+ c5builder => Contains a Borland workspace for building libpng
+ and zlib
+ visualc6 => Contains a Microsoft Visual C++ (MSVC) workspace
+ for building libpng and zlib
+ netware.txt => Contains instructions for downloading a set of
+ project files for building libpng and zlib on
+ Netware.
+ wince.txt => Contains instructions for downloading a Microsoft
+ Visual C++ (Windows CD Toolkit) workspace for
+ building libpng and zlib on WindowsCE
+ scripts => Directory containing scripts for building libpng:
+ descrip.mms => VMS makefile for MMS or MMK
+ makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
+ makefile.elf => Linux/ELF makefile symbol versioning,
+ gcc, creates libpng12.so.0.1.2.29)
+ makefile.linux => Linux/ELF makefile
+ (gcc, creates libpng12.so.0.1.2.29)
+ makefile.gcmmx => Linux/ELF makefile
+ (gcc, creates libpng12.so.0.1.2.29,
+ uses 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
+ ftp://ftp.cs.wisc.edu/ghost)
+ makefile.aix => AIX makefile
+ makefile.cygwin => Cygwin/gcc makefile
+ makefile.darwin => Darwin makefile
+ makefile.dec => DEC Alpha UNIX makefile
+ makefile.freebsd => FreeBSD makefile
+ makefile.hpgcc => HPUX makefile using gcc
+ makefile.hpux => HPUX (10.20 and 11.00) makefile
+ makefile.hp64 => HPUX (10.20 and 11.00) makefile, 64 bit
+ makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2 (static)
+ makefile.intel => Intel C/C++ version 4.0 and later
+ libpng.icc => Project file, IBM VisualAge/C++ 4.0 or later
+ makefile.netbsd => NetBSD/cc makefile, PNGGCCRD, makes libpng.so.
+ makefile.ne12bsd => NetBSD/cc makefile, PNGGCCRD, makes libpng12.so
+ makefile.openbsd => OpenBSD makefile
+ makefile.sgi => Silicon Graphics IRIX (cc, creates static lib)
+ makefile.sggcc => Silicon Graphics
+ (gcc, creates libpng12.so.0.1.2.29)
+ makefile.sunos => Sun makefile
+ makefile.solaris => Solaris 2.X makefile
+ (gcc, creates libpng12.so.0.1.2.29)
+ makefile.so9 => Solaris 9 makefile
+ (gcc, creates libpng12.so.0.1.2.29)
+ makefile.32sunu => Sun Ultra 32-bit makefile
+ makefile.64sunu => Sun Ultra 64-bit makefile
+ 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
+ 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
+ makefile.dj2 => DJGPP 2 makefile
+ makefile.msc => Microsoft C makefile
+ makefile.vcawin32=> makefile for Microsoft Visual C++ 5.0 and
+ later (uses assembler code tuned for Intel MMX
+ platform)
+ makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and
+ later (does not use assembler code)
+ 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
+
+Good luck, and happy coding.
+
+-Glenn Randers-Pehrson (current maintainer)
+ Internet: glennrp at users.sourceforge.net
+
+-Andreas Eric Dilger (former maintainer, 1996-1997)
+ Internet: adilger at enel.ucalgary.ca
+ Web: http://members.shaw.ca/adilger/
+
+-Guy Eric Schalnat (original author and former maintainer, 1995-1996)
+ (formerly of Group 42, Inc)
+ Internet: gschal at infinet.com
projects / opencv / blobdiff