| Index: third_party/libpng/README
|
| ===================================================================
|
| --- third_party/libpng/README (revision 0)
|
| +++ third_party/libpng/README (revision 0)
|
| @@ -0,0 +1,267 @@
|
| +README for libpng version 1.2.33 - October 31, 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. 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
|
| +UNIX-style line endings from the *.7z file. The *.tar.lzma file is
|
| +recommended for *NIX users instead.
|
| +
|
| +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-mng-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-mng-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-mng-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.0.1.2.33)
|
| + makefile.linux => Linux/ELF makefile
|
| + (gcc, creates libpng12.so.0.1.2.33)
|
| + makefile.gcmmx => Linux/ELF makefile
|
| + (gcc, creates libpng12.so.0.1.2.33,
|
| + 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.0.1.2.33)
|
| + makefile.sunos => Sun makefile
|
| + makefile.solaris => Solaris 2.X makefile
|
| + (gcc, creates libpng12.so.0.1.2.33)
|
| + makefile.so9 => Solaris 9 makefile
|
| + (gcc, creates libpng12.so.0.1.2.33)
|
| + 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
|
|
|
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